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Chris Lattner5b183d82006-11-10 05:03:26 +00001//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===//
2//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner5b12ab82007-12-29 19:59:25 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Chris Lattner5b183d82006-11-10 05:03:26 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This file implements semantic analysis for expressions.
11//
12//===----------------------------------------------------------------------===//
13
John McCall83024632010-08-25 22:03:47 +000014#include "clang/Sema/SemaInternal.h"
Chandler Carruth3a022472012-12-04 09:13:33 +000015#include "TreeTransform.h"
Argyrios Kyrtzidise5dc5b32012-02-10 20:10:44 +000016#include "clang/AST/ASTConsumer.h"
Chandler Carruth3a022472012-12-04 09:13:33 +000017#include "clang/AST/ASTContext.h"
Sebastian Redl2ac2c722011-04-29 08:19:30 +000018#include "clang/AST/ASTMutationListener.h"
Douglas Gregord1702062010-04-29 00:18:15 +000019#include "clang/AST/CXXInheritance.h"
Daniel Dunbar6e8aa532008-08-11 05:35:13 +000020#include "clang/AST/DeclObjC.h"
Anders Carlsson029fc692009-08-26 22:59:12 +000021#include "clang/AST/DeclTemplate.h"
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000022#include "clang/AST/EvaluatedExprVisitor.h"
Douglas Gregor882211c2010-04-28 22:16:22 +000023#include "clang/AST/Expr.h"
Chris Lattneraa9c7ae2008-04-08 04:40:51 +000024#include "clang/AST/ExprCXX.h"
Steve Naroff021ca182008-05-29 21:12:08 +000025#include "clang/AST/ExprObjC.h"
Douglas Gregor5597ab42010-05-07 23:12:07 +000026#include "clang/AST/RecursiveASTVisitor.h"
Douglas Gregor882211c2010-04-28 22:16:22 +000027#include "clang/AST/TypeLoc.h"
Anders Carlsson029fc692009-08-26 22:59:12 +000028#include "clang/Basic/PartialDiagnostic.h"
Steve Narofff2fb89e2007-03-13 20:29:44 +000029#include "clang/Basic/SourceManager.h"
Chris Lattner5b183d82006-11-10 05:03:26 +000030#include "clang/Basic/TargetInfo.h"
Anders Carlsson029fc692009-08-26 22:59:12 +000031#include "clang/Lex/LiteralSupport.h"
32#include "clang/Lex/Preprocessor.h"
Chandler Carruth3a022472012-12-04 09:13:33 +000033#include "clang/Sema/AnalysisBasedWarnings.h"
John McCall8b0666c2010-08-20 18:27:03 +000034#include "clang/Sema/DeclSpec.h"
Chandler Carruth3a022472012-12-04 09:13:33 +000035#include "clang/Sema/DelayedDiagnostic.h"
John McCall8b0666c2010-08-20 18:27:03 +000036#include "clang/Sema/Designator.h"
Chandler Carruth3a022472012-12-04 09:13:33 +000037#include "clang/Sema/Initialization.h"
38#include "clang/Sema/Lookup.h"
39#include "clang/Sema/ParsedTemplate.h"
John McCall8b0666c2010-08-20 18:27:03 +000040#include "clang/Sema/Scope.h"
John McCallaab3e412010-08-25 08:40:02 +000041#include "clang/Sema/ScopeInfo.h"
Anna Zaks3b402712011-07-28 19:51:27 +000042#include "clang/Sema/SemaFixItUtils.h"
John McCallde6836a2010-08-24 07:21:54 +000043#include "clang/Sema/Template.h"
Chris Lattner5b183d82006-11-10 05:03:26 +000044using namespace clang;
John McCallaab3e412010-08-25 08:40:02 +000045using namespace sema;
Chris Lattner5b183d82006-11-10 05:03:26 +000046
Sebastian Redlb49c46c2011-09-24 17:48:00 +000047/// \brief Determine whether the use of this declaration is valid, without
48/// emitting diagnostics.
49bool Sema::CanUseDecl(NamedDecl *D) {
50 // See if this is an auto-typed variable whose initializer we are parsing.
51 if (ParsingInitForAutoVars.count(D))
52 return false;
53
54 // See if this is a deleted function.
55 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
56 if (FD->isDeleted())
57 return false;
58 }
Sebastian Redl5999aec2011-10-16 18:19:16 +000059
60 // See if this function is unavailable.
61 if (D->getAvailability() == AR_Unavailable &&
62 cast<Decl>(CurContext)->getAvailability() != AR_Unavailable)
63 return false;
64
Sebastian Redlb49c46c2011-09-24 17:48:00 +000065 return true;
66}
David Chisnall9f57c292009-08-17 16:35:33 +000067
Fariborz Jahanian66c93f42012-09-06 16:43:18 +000068static void DiagnoseUnusedOfDecl(Sema &S, NamedDecl *D, SourceLocation Loc) {
69 // Warn if this is used but marked unused.
70 if (D->hasAttr<UnusedAttr>()) {
Fariborz Jahanian979780f2012-09-06 18:38:58 +000071 const Decl *DC = cast<Decl>(S.getCurObjCLexicalContext());
Fariborz Jahanian66c93f42012-09-06 16:43:18 +000072 if (!DC->hasAttr<UnusedAttr>())
73 S.Diag(Loc, diag::warn_used_but_marked_unused) << D->getDeclName();
74 }
75}
76
Ted Kremenek6eb25622012-02-10 02:45:47 +000077static AvailabilityResult DiagnoseAvailabilityOfDecl(Sema &S,
Fariborz Jahanian6b854c52011-09-29 22:45:21 +000078 NamedDecl *D, SourceLocation Loc,
79 const ObjCInterfaceDecl *UnknownObjCClass) {
80 // See if this declaration is unavailable or deprecated.
81 std::string Message;
82 AvailabilityResult Result = D->getAvailability(&Message);
Fariborz Jahanian25d09c22011-11-28 19:45:58 +000083 if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D))
84 if (Result == AR_Available) {
85 const DeclContext *DC = ECD->getDeclContext();
86 if (const EnumDecl *TheEnumDecl = dyn_cast<EnumDecl>(DC))
87 Result = TheEnumDecl->getAvailability(&Message);
88 }
Jordan Rose2bd991a2012-10-10 16:42:54 +000089
Fariborz Jahanian974c9482012-09-21 20:46:37 +000090 const ObjCPropertyDecl *ObjCPDecl = 0;
Jordan Rose2bd991a2012-10-10 16:42:54 +000091 if (Result == AR_Deprecated || Result == AR_Unavailable) {
92 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
93 if (const ObjCPropertyDecl *PD = MD->findPropertyDecl()) {
94 AvailabilityResult PDeclResult = PD->getAvailability(0);
95 if (PDeclResult == Result)
96 ObjCPDecl = PD;
97 }
Fariborz Jahanian974c9482012-09-21 20:46:37 +000098 }
Jordan Rose2bd991a2012-10-10 16:42:54 +000099 }
Fariborz Jahanian25d09c22011-11-28 19:45:58 +0000100
Fariborz Jahanian6b854c52011-09-29 22:45:21 +0000101 switch (Result) {
102 case AR_Available:
103 case AR_NotYetIntroduced:
104 break;
105
106 case AR_Deprecated:
Fariborz Jahanian974c9482012-09-21 20:46:37 +0000107 S.EmitDeprecationWarning(D, Message, Loc, UnknownObjCClass, ObjCPDecl);
Fariborz Jahanian6b854c52011-09-29 22:45:21 +0000108 break;
109
110 case AR_Unavailable:
Ted Kremenek6eb25622012-02-10 02:45:47 +0000111 if (S.getCurContextAvailability() != AR_Unavailable) {
Fariborz Jahanian6b854c52011-09-29 22:45:21 +0000112 if (Message.empty()) {
Fariborz Jahanian974c9482012-09-21 20:46:37 +0000113 if (!UnknownObjCClass) {
Ted Kremenek6eb25622012-02-10 02:45:47 +0000114 S.Diag(Loc, diag::err_unavailable) << D->getDeclName();
Fariborz Jahanian974c9482012-09-21 20:46:37 +0000115 if (ObjCPDecl)
116 S.Diag(ObjCPDecl->getLocation(), diag::note_property_attribute)
117 << ObjCPDecl->getDeclName() << 1;
118 }
Fariborz Jahanian6b854c52011-09-29 22:45:21 +0000119 else
Ted Kremenek6eb25622012-02-10 02:45:47 +0000120 S.Diag(Loc, diag::warn_unavailable_fwdclass_message)
Fariborz Jahanian6b854c52011-09-29 22:45:21 +0000121 << D->getDeclName();
122 }
Fariborz Jahanian974c9482012-09-21 20:46:37 +0000123 else
Ted Kremenek6eb25622012-02-10 02:45:47 +0000124 S.Diag(Loc, diag::err_unavailable_message)
Fariborz Jahanian6b854c52011-09-29 22:45:21 +0000125 << D->getDeclName() << Message;
Fariborz Jahanian974c9482012-09-21 20:46:37 +0000126 S.Diag(D->getLocation(), diag::note_unavailable_here)
127 << isa<FunctionDecl>(D) << false;
128 if (ObjCPDecl)
129 S.Diag(ObjCPDecl->getLocation(), diag::note_property_attribute)
130 << ObjCPDecl->getDeclName() << 1;
Fariborz Jahanian6b854c52011-09-29 22:45:21 +0000131 }
132 break;
133 }
134 return Result;
135}
136
Richard Smith852265f2012-03-30 20:53:28 +0000137/// \brief Emit a note explaining that this function is deleted or unavailable.
138void Sema::NoteDeletedFunction(FunctionDecl *Decl) {
139 CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Decl);
140
Richard Smith6f1e2c62012-04-02 20:59:25 +0000141 if (Method && Method->isDeleted() && !Method->isDeletedAsWritten()) {
142 // If the method was explicitly defaulted, point at that declaration.
143 if (!Method->isImplicit())
144 Diag(Decl->getLocation(), diag::note_implicitly_deleted);
145
146 // Try to diagnose why this special member function was implicitly
147 // deleted. This might fail, if that reason no longer applies.
Richard Smith852265f2012-03-30 20:53:28 +0000148 CXXSpecialMember CSM = getSpecialMember(Method);
Richard Smith6f1e2c62012-04-02 20:59:25 +0000149 if (CSM != CXXInvalid)
150 ShouldDeleteSpecialMember(Method, CSM, /*Diagnose=*/true);
151
152 return;
Richard Smith852265f2012-03-30 20:53:28 +0000153 }
154
155 Diag(Decl->getLocation(), diag::note_unavailable_here)
156 << 1 << Decl->isDeleted();
157}
158
Jordan Rose28cd12f2012-06-18 22:09:19 +0000159/// \brief Determine whether a FunctionDecl was ever declared with an
160/// explicit storage class.
161static bool hasAnyExplicitStorageClass(const FunctionDecl *D) {
162 for (FunctionDecl::redecl_iterator I = D->redecls_begin(),
163 E = D->redecls_end();
164 I != E; ++I) {
165 if (I->getStorageClassAsWritten() != SC_None)
166 return true;
167 }
168 return false;
169}
170
171/// \brief Check whether we're in an extern inline function and referring to a
Jordan Rosede9e9762012-06-20 18:50:06 +0000172/// variable or function with internal linkage (C11 6.7.4p3).
Jordan Rose28cd12f2012-06-18 22:09:19 +0000173///
Jordan Rose28cd12f2012-06-18 22:09:19 +0000174/// This is only a warning because we used to silently accept this code, but
Jordan Rosede9e9762012-06-20 18:50:06 +0000175/// in many cases it will not behave correctly. This is not enabled in C++ mode
176/// because the restriction language is a bit weaker (C++11 [basic.def.odr]p6)
177/// and so while there may still be user mistakes, most of the time we can't
178/// prove that there are errors.
Jordan Rose28cd12f2012-06-18 22:09:19 +0000179static void diagnoseUseOfInternalDeclInInlineFunction(Sema &S,
180 const NamedDecl *D,
181 SourceLocation Loc) {
Jordan Rosede9e9762012-06-20 18:50:06 +0000182 // This is disabled under C++; there are too many ways for this to fire in
183 // contexts where the warning is a false positive, or where it is technically
184 // correct but benign.
185 if (S.getLangOpts().CPlusPlus)
186 return;
Jordan Rose28cd12f2012-06-18 22:09:19 +0000187
188 // Check if this is an inlined function or method.
189 FunctionDecl *Current = S.getCurFunctionDecl();
190 if (!Current)
191 return;
192 if (!Current->isInlined())
193 return;
194 if (Current->getLinkage() != ExternalLinkage)
195 return;
196
197 // Check if the decl has internal linkage.
Jordan Rosede9e9762012-06-20 18:50:06 +0000198 if (D->getLinkage() != InternalLinkage)
Jordan Rose28cd12f2012-06-18 22:09:19 +0000199 return;
Jordan Rose28cd12f2012-06-18 22:09:19 +0000200
Jordan Rose815fe262012-06-21 05:54:50 +0000201 // Downgrade from ExtWarn to Extension if
202 // (1) the supposedly external inline function is in the main file,
203 // and probably won't be included anywhere else.
204 // (2) the thing we're referencing is a pure function.
205 // (3) the thing we're referencing is another inline function.
206 // This last can give us false negatives, but it's better than warning on
207 // wrappers for simple C library functions.
208 const FunctionDecl *UsedFn = dyn_cast<FunctionDecl>(D);
209 bool DowngradeWarning = S.getSourceManager().isFromMainFile(Loc);
210 if (!DowngradeWarning && UsedFn)
211 DowngradeWarning = UsedFn->isInlined() || UsedFn->hasAttr<ConstAttr>();
212
213 S.Diag(Loc, DowngradeWarning ? diag::ext_internal_in_extern_inline
214 : diag::warn_internal_in_extern_inline)
215 << /*IsVar=*/!UsedFn << D;
Jordan Rose28cd12f2012-06-18 22:09:19 +0000216
217 // Suggest "static" on the inline function, if possible.
Jordan Rosede9e9762012-06-20 18:50:06 +0000218 if (!hasAnyExplicitStorageClass(Current)) {
Jordan Rose28cd12f2012-06-18 22:09:19 +0000219 const FunctionDecl *FirstDecl = Current->getCanonicalDecl();
220 SourceLocation DeclBegin = FirstDecl->getSourceRange().getBegin();
221 S.Diag(DeclBegin, diag::note_convert_inline_to_static)
222 << Current << FixItHint::CreateInsertion(DeclBegin, "static ");
223 }
224
225 S.Diag(D->getCanonicalDecl()->getLocation(),
226 diag::note_internal_decl_declared_here)
227 << D;
228}
229
Douglas Gregor171c45a2009-02-18 21:56:37 +0000230/// \brief Determine whether the use of this declaration is valid, and
231/// emit any corresponding diagnostics.
232///
233/// This routine diagnoses various problems with referencing
234/// declarations that can occur when using a declaration. For example,
235/// it might warn if a deprecated or unavailable declaration is being
236/// used, or produce an error (and return true) if a C++0x deleted
237/// function is being used.
238///
239/// \returns true if there was an error (this declaration cannot be
240/// referenced), false otherwise.
Chris Lattnerb7df3c62009-10-25 22:31:57 +0000241///
Fariborz Jahanian7d6e11a2010-12-21 00:44:01 +0000242bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc,
Fariborz Jahanian6b854c52011-09-29 22:45:21 +0000243 const ObjCInterfaceDecl *UnknownObjCClass) {
David Blaikiebbafb8a2012-03-11 07:00:24 +0000244 if (getLangOpts().CPlusPlus && isa<FunctionDecl>(D)) {
Douglas Gregor5bb5e4a2010-10-12 23:32:35 +0000245 // If there were any diagnostics suppressed by template argument deduction,
246 // emit them now.
Chris Lattner0e62c1c2011-07-23 10:55:15 +0000247 llvm::DenseMap<Decl *, SmallVector<PartialDiagnosticAt, 1> >::iterator
Douglas Gregor5bb5e4a2010-10-12 23:32:35 +0000248 Pos = SuppressedDiagnostics.find(D->getCanonicalDecl());
249 if (Pos != SuppressedDiagnostics.end()) {
Chris Lattner0e62c1c2011-07-23 10:55:15 +0000250 SmallVectorImpl<PartialDiagnosticAt> &Suppressed = Pos->second;
Douglas Gregor5bb5e4a2010-10-12 23:32:35 +0000251 for (unsigned I = 0, N = Suppressed.size(); I != N; ++I)
252 Diag(Suppressed[I].first, Suppressed[I].second);
253
254 // Clear out the list of suppressed diagnostics, so that we don't emit
Douglas Gregor20b2ebd2011-03-23 00:50:03 +0000255 // them again for this specialization. However, we don't obsolete this
Douglas Gregor5bb5e4a2010-10-12 23:32:35 +0000256 // entry from the table, because we want to avoid ever emitting these
257 // diagnostics again.
258 Suppressed.clear();
259 }
260 }
261
Richard Smith30482bc2011-02-20 03:19:35 +0000262 // See if this is an auto-typed variable whose initializer we are parsing.
Richard Smithb2bc2e62011-02-21 20:05:19 +0000263 if (ParsingInitForAutoVars.count(D)) {
264 Diag(Loc, diag::err_auto_variable_cannot_appear_in_own_initializer)
265 << D->getDeclName();
266 return true;
Richard Smith30482bc2011-02-20 03:19:35 +0000267 }
268
Douglas Gregor171c45a2009-02-18 21:56:37 +0000269 // See if this is a deleted function.
Douglas Gregorde681d42009-02-24 04:26:15 +0000270 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
Douglas Gregor171c45a2009-02-18 21:56:37 +0000271 if (FD->isDeleted()) {
272 Diag(Loc, diag::err_deleted_function_use);
Richard Smith852265f2012-03-30 20:53:28 +0000273 NoteDeletedFunction(FD);
Douglas Gregor171c45a2009-02-18 21:56:37 +0000274 return true;
275 }
Douglas Gregorde681d42009-02-24 04:26:15 +0000276 }
Ted Kremenek6eb25622012-02-10 02:45:47 +0000277 DiagnoseAvailabilityOfDecl(*this, D, Loc, UnknownObjCClass);
Douglas Gregor20b2ebd2011-03-23 00:50:03 +0000278
Fariborz Jahanian66c93f42012-09-06 16:43:18 +0000279 DiagnoseUnusedOfDecl(*this, D, Loc);
Jordan Rose2684c682012-06-15 18:19:48 +0000280
Jordan Rose28cd12f2012-06-18 22:09:19 +0000281 diagnoseUseOfInternalDeclInInlineFunction(*this, D, Loc);
Jordan Rose2684c682012-06-15 18:19:48 +0000282
Douglas Gregor171c45a2009-02-18 21:56:37 +0000283 return false;
Chris Lattner4bf74fd2009-02-15 22:43:40 +0000284}
285
Douglas Gregor20b2ebd2011-03-23 00:50:03 +0000286/// \brief Retrieve the message suffix that should be added to a
287/// diagnostic complaining about the given function being deleted or
288/// unavailable.
289std::string Sema::getDeletedOrUnavailableSuffix(const FunctionDecl *FD) {
Douglas Gregor20b2ebd2011-03-23 00:50:03 +0000290 std::string Message;
291 if (FD->getAvailability(&Message))
292 return ": " + Message;
293
294 return std::string();
295}
296
John McCallb46f2872011-09-09 07:56:05 +0000297/// DiagnoseSentinelCalls - This routine checks whether a call or
298/// message-send is to a declaration with the sentinel attribute, and
299/// if so, it checks that the requirements of the sentinel are
300/// satisfied.
Fariborz Jahanian027b8862009-05-13 18:09:35 +0000301void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
John McCallb46f2872011-09-09 07:56:05 +0000302 Expr **args, unsigned numArgs) {
Argyrios Kyrtzidisb4b64ca2009-06-30 02:34:44 +0000303 const SentinelAttr *attr = D->getAttr<SentinelAttr>();
Mike Stump11289f42009-09-09 15:08:12 +0000304 if (!attr)
Fariborz Jahanian9e877212009-05-13 23:20:50 +0000305 return;
Douglas Gregorc298ffc2010-04-22 16:44:27 +0000306
John McCallb46f2872011-09-09 07:56:05 +0000307 // The number of formal parameters of the declaration.
308 unsigned numFormalParams;
Mike Stump11289f42009-09-09 15:08:12 +0000309
John McCallb46f2872011-09-09 07:56:05 +0000310 // The kind of declaration. This is also an index into a %select in
311 // the diagnostic.
312 enum CalleeType { CT_Function, CT_Method, CT_Block } calleeType;
313
Fariborz Jahanian4a528032009-05-14 18:00:00 +0000314 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
John McCallb46f2872011-09-09 07:56:05 +0000315 numFormalParams = MD->param_size();
316 calleeType = CT_Method;
Mike Stump12b8ce12009-08-04 21:02:39 +0000317 } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
John McCallb46f2872011-09-09 07:56:05 +0000318 numFormalParams = FD->param_size();
319 calleeType = CT_Function;
320 } else if (isa<VarDecl>(D)) {
321 QualType type = cast<ValueDecl>(D)->getType();
322 const FunctionType *fn = 0;
323 if (const PointerType *ptr = type->getAs<PointerType>()) {
324 fn = ptr->getPointeeType()->getAs<FunctionType>();
325 if (!fn) return;
326 calleeType = CT_Function;
327 } else if (const BlockPointerType *ptr = type->getAs<BlockPointerType>()) {
328 fn = ptr->getPointeeType()->castAs<FunctionType>();
329 calleeType = CT_Block;
330 } else {
Fariborz Jahanian0aa5c452009-05-15 20:33:25 +0000331 return;
John McCallb46f2872011-09-09 07:56:05 +0000332 }
Fariborz Jahanian4a528032009-05-14 18:00:00 +0000333
John McCallb46f2872011-09-09 07:56:05 +0000334 if (const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(fn)) {
335 numFormalParams = proto->getNumArgs();
336 } else {
337 numFormalParams = 0;
338 }
339 } else {
Fariborz Jahanian9e877212009-05-13 23:20:50 +0000340 return;
341 }
John McCallb46f2872011-09-09 07:56:05 +0000342
343 // "nullPos" is the number of formal parameters at the end which
344 // effectively count as part of the variadic arguments. This is
345 // useful if you would prefer to not have *any* formal parameters,
346 // but the language forces you to have at least one.
347 unsigned nullPos = attr->getNullPos();
348 assert((nullPos == 0 || nullPos == 1) && "invalid null position on sentinel");
349 numFormalParams = (nullPos > numFormalParams ? 0 : numFormalParams - nullPos);
350
351 // The number of arguments which should follow the sentinel.
352 unsigned numArgsAfterSentinel = attr->getSentinel();
353
354 // If there aren't enough arguments for all the formal parameters,
355 // the sentinel, and the args after the sentinel, complain.
356 if (numArgs < numFormalParams + numArgsAfterSentinel + 1) {
Fariborz Jahanian9e877212009-05-13 23:20:50 +0000357 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName();
John McCallb46f2872011-09-09 07:56:05 +0000358 Diag(D->getLocation(), diag::note_sentinel_here) << calleeType;
Fariborz Jahanian9e877212009-05-13 23:20:50 +0000359 return;
360 }
John McCallb46f2872011-09-09 07:56:05 +0000361
362 // Otherwise, find the sentinel expression.
363 Expr *sentinelExpr = args[numArgs - numArgsAfterSentinel - 1];
John McCall7ddbcf42010-05-06 23:53:00 +0000364 if (!sentinelExpr) return;
John McCall7ddbcf42010-05-06 23:53:00 +0000365 if (sentinelExpr->isValueDependent()) return;
Argyrios Kyrtzidis2e809ce2012-02-03 05:58:16 +0000366 if (Context.isSentinelNullExpr(sentinelExpr)) return;
John McCall7ddbcf42010-05-06 23:53:00 +0000367
John McCallb46f2872011-09-09 07:56:05 +0000368 // Pick a reasonable string to insert. Optimistically use 'nil' or
369 // 'NULL' if those are actually defined in the context. Only use
370 // 'nil' for ObjC methods, where it's much more likely that the
371 // variadic arguments form a list of object pointers.
372 SourceLocation MissingNilLoc
Douglas Gregor5ff4e982011-07-30 08:57:03 +0000373 = PP.getLocForEndOfToken(sentinelExpr->getLocEnd());
374 std::string NullValue;
John McCallb46f2872011-09-09 07:56:05 +0000375 if (calleeType == CT_Method &&
376 PP.getIdentifierInfo("nil")->hasMacroDefinition())
Douglas Gregor5ff4e982011-07-30 08:57:03 +0000377 NullValue = "nil";
378 else if (PP.getIdentifierInfo("NULL")->hasMacroDefinition())
379 NullValue = "NULL";
Douglas Gregor5ff4e982011-07-30 08:57:03 +0000380 else
John McCallb46f2872011-09-09 07:56:05 +0000381 NullValue = "(void*) 0";
Eli Friedman9ab36372011-09-27 23:46:37 +0000382
383 if (MissingNilLoc.isInvalid())
384 Diag(Loc, diag::warn_missing_sentinel) << calleeType;
385 else
386 Diag(MissingNilLoc, diag::warn_missing_sentinel)
387 << calleeType
388 << FixItHint::CreateInsertion(MissingNilLoc, ", " + NullValue);
John McCallb46f2872011-09-09 07:56:05 +0000389 Diag(D->getLocation(), diag::note_sentinel_here) << calleeType;
Fariborz Jahanian027b8862009-05-13 18:09:35 +0000390}
391
Richard Trieuba63ce62011-09-09 01:45:06 +0000392SourceRange Sema::getExprRange(Expr *E) const {
393 return E ? E->getSourceRange() : SourceRange();
Douglas Gregor87f95b02009-02-26 21:00:50 +0000394}
395
Chris Lattner513165e2008-07-25 21:10:04 +0000396//===----------------------------------------------------------------------===//
397// Standard Promotions and Conversions
398//===----------------------------------------------------------------------===//
399
Chris Lattner513165e2008-07-25 21:10:04 +0000400/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4).
John Wiegley01296292011-04-08 18:41:53 +0000401ExprResult Sema::DefaultFunctionArrayConversion(Expr *E) {
John McCall50a2c2c2011-10-11 23:14:30 +0000402 // Handle any placeholder expressions which made it here.
403 if (E->getType()->isPlaceholderType()) {
404 ExprResult result = CheckPlaceholderExpr(E);
405 if (result.isInvalid()) return ExprError();
406 E = result.take();
407 }
408
Chris Lattner513165e2008-07-25 21:10:04 +0000409 QualType Ty = E->getType();
410 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type");
411
Chris Lattner513165e2008-07-25 21:10:04 +0000412 if (Ty->isFunctionType())
John Wiegley01296292011-04-08 18:41:53 +0000413 E = ImpCastExprToType(E, Context.getPointerType(Ty),
414 CK_FunctionToPointerDecay).take();
Chris Lattner61f60a02008-07-25 21:33:13 +0000415 else if (Ty->isArrayType()) {
416 // In C90 mode, arrays only promote to pointers if the array expression is
417 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has
418 // type 'array of type' is converted to an expression that has type 'pointer
419 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression
420 // that has type 'array of type' ...". The relevant change is "an lvalue"
421 // (C90) to "an expression" (C99).
Argyrios Kyrtzidis9321c742008-09-11 04:25:59 +0000422 //
423 // C++ 4.2p1:
424 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of
425 // T" can be converted to an rvalue of type "pointer to T".
426 //
David Blaikiebbafb8a2012-03-11 07:00:24 +0000427 if (getLangOpts().C99 || getLangOpts().CPlusPlus || E->isLValue())
John Wiegley01296292011-04-08 18:41:53 +0000428 E = ImpCastExprToType(E, Context.getArrayDecayedType(Ty),
429 CK_ArrayToPointerDecay).take();
Chris Lattner61f60a02008-07-25 21:33:13 +0000430 }
John Wiegley01296292011-04-08 18:41:53 +0000431 return Owned(E);
Chris Lattner513165e2008-07-25 21:10:04 +0000432}
433
Argyrios Kyrtzidisa9b630e2011-04-26 17:41:22 +0000434static void CheckForNullPointerDereference(Sema &S, Expr *E) {
435 // Check to see if we are dereferencing a null pointer. If so,
436 // and if not volatile-qualified, this is undefined behavior that the
437 // optimizer will delete, so warn about it. People sometimes try to use this
438 // to get a deterministic trap and are surprised by clang's behavior. This
439 // only handles the pattern "*null", which is a very syntactic check.
440 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E->IgnoreParenCasts()))
441 if (UO->getOpcode() == UO_Deref &&
442 UO->getSubExpr()->IgnoreParenCasts()->
443 isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull) &&
444 !UO->getType().isVolatileQualified()) {
445 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
446 S.PDiag(diag::warn_indirection_through_null)
447 << UO->getSubExpr()->getSourceRange());
448 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
449 S.PDiag(diag::note_indirection_through_null));
450 }
451}
452
John Wiegley01296292011-04-08 18:41:53 +0000453ExprResult Sema::DefaultLvalueConversion(Expr *E) {
John McCall50a2c2c2011-10-11 23:14:30 +0000454 // Handle any placeholder expressions which made it here.
455 if (E->getType()->isPlaceholderType()) {
456 ExprResult result = CheckPlaceholderExpr(E);
457 if (result.isInvalid()) return ExprError();
458 E = result.take();
459 }
460
John McCallf3735e02010-12-01 04:43:34 +0000461 // C++ [conv.lval]p1:
462 // A glvalue of a non-function, non-array type T can be
463 // converted to a prvalue.
John Wiegley01296292011-04-08 18:41:53 +0000464 if (!E->isGLValue()) return Owned(E);
Kaelyn Uhrain2e7aa5a2011-08-05 23:18:04 +0000465
John McCall27584242010-12-06 20:48:59 +0000466 QualType T = E->getType();
467 assert(!T.isNull() && "r-value conversion on typeless expression?");
John McCall34376a62010-12-04 03:47:34 +0000468
John McCall27584242010-12-06 20:48:59 +0000469 // We don't want to throw lvalue-to-rvalue casts on top of
470 // expressions of certain types in C++.
David Blaikiebbafb8a2012-03-11 07:00:24 +0000471 if (getLangOpts().CPlusPlus &&
John McCall27584242010-12-06 20:48:59 +0000472 (E->getType() == Context.OverloadTy ||
473 T->isDependentType() ||
474 T->isRecordType()))
John Wiegley01296292011-04-08 18:41:53 +0000475 return Owned(E);
John McCall27584242010-12-06 20:48:59 +0000476
477 // The C standard is actually really unclear on this point, and
478 // DR106 tells us what the result should be but not why. It's
479 // generally best to say that void types just doesn't undergo
480 // lvalue-to-rvalue at all. Note that expressions of unqualified
481 // 'void' type are never l-values, but qualified void can be.
482 if (T->isVoidType())
John Wiegley01296292011-04-08 18:41:53 +0000483 return Owned(E);
John McCall27584242010-12-06 20:48:59 +0000484
John McCall6ced97a2013-02-12 01:29:43 +0000485 // OpenCL usually rejects direct accesses to values of 'half' type.
486 if (getLangOpts().OpenCL && !getOpenCLOptions().cl_khr_fp16 &&
487 T->isHalfType()) {
488 Diag(E->getExprLoc(), diag::err_opencl_half_load_store)
489 << 0 << T;
490 return ExprError();
491 }
492
Argyrios Kyrtzidisa9b630e2011-04-26 17:41:22 +0000493 CheckForNullPointerDereference(*this, E);
494
John McCall27584242010-12-06 20:48:59 +0000495 // C++ [conv.lval]p1:
496 // [...] If T is a non-class type, the type of the prvalue is the
497 // cv-unqualified version of T. Otherwise, the type of the
498 // rvalue is T.
499 //
500 // C99 6.3.2.1p2:
501 // If the lvalue has qualified type, the value has the unqualified
502 // version of the type of the lvalue; otherwise, the value has the
Anton Korobeynikovf0c267e2011-10-14 23:23:15 +0000503 // type of the lvalue.
John McCall27584242010-12-06 20:48:59 +0000504 if (T.hasQualifiers())
505 T = T.getUnqualifiedType();
Anton Korobeynikovf0c267e2011-10-14 23:23:15 +0000506
Eli Friedman3bda6b12012-02-02 23:15:15 +0000507 UpdateMarkingForLValueToRValue(E);
Fariborz Jahanianfbd19742012-11-27 23:02:53 +0000508
509 // Loading a __weak object implicitly retains the value, so we need a cleanup to
510 // balance that.
511 if (getLangOpts().ObjCAutoRefCount &&
512 E->getType().getObjCLifetime() == Qualifiers::OCL_Weak)
513 ExprNeedsCleanups = true;
Eli Friedman3bda6b12012-02-02 23:15:15 +0000514
Anton Korobeynikovf0c267e2011-10-14 23:23:15 +0000515 ExprResult Res = Owned(ImplicitCastExpr::Create(Context, T, CK_LValueToRValue,
516 E, 0, VK_RValue));
517
Douglas Gregorc79862f2012-04-12 17:51:55 +0000518 // C11 6.3.2.1p2:
519 // ... if the lvalue has atomic type, the value has the non-atomic version
520 // of the type of the lvalue ...
521 if (const AtomicType *Atomic = T->getAs<AtomicType>()) {
522 T = Atomic->getValueType().getUnqualifiedType();
523 Res = Owned(ImplicitCastExpr::Create(Context, T, CK_AtomicToNonAtomic,
524 Res.get(), 0, VK_RValue));
525 }
526
Anton Korobeynikovf0c267e2011-10-14 23:23:15 +0000527 return Res;
John McCall27584242010-12-06 20:48:59 +0000528}
529
John Wiegley01296292011-04-08 18:41:53 +0000530ExprResult Sema::DefaultFunctionArrayLvalueConversion(Expr *E) {
531 ExprResult Res = DefaultFunctionArrayConversion(E);
532 if (Res.isInvalid())
533 return ExprError();
534 Res = DefaultLvalueConversion(Res.take());
535 if (Res.isInvalid())
536 return ExprError();
Benjamin Kramer62b95d82012-08-23 21:35:17 +0000537 return Res;
Douglas Gregorb92a1562010-02-03 00:27:59 +0000538}
539
540
Chris Lattner513165e2008-07-25 21:10:04 +0000541/// UsualUnaryConversions - Performs various conversions that are common to most
Mike Stump11289f42009-09-09 15:08:12 +0000542/// operators (C99 6.3). The conversions of array and function types are
Chris Lattner57540c52011-04-15 05:22:18 +0000543/// sometimes suppressed. For example, the array->pointer conversion doesn't
Chris Lattner513165e2008-07-25 21:10:04 +0000544/// apply if the array is an argument to the sizeof or address (&) operators.
545/// In these instances, this routine should *not* be called.
John Wiegley01296292011-04-08 18:41:53 +0000546ExprResult Sema::UsualUnaryConversions(Expr *E) {
John McCallf3735e02010-12-01 04:43:34 +0000547 // First, convert to an r-value.
John Wiegley01296292011-04-08 18:41:53 +0000548 ExprResult Res = DefaultFunctionArrayLvalueConversion(E);
549 if (Res.isInvalid())
550 return Owned(E);
551 E = Res.take();
Anton Korobeynikovf0c267e2011-10-14 23:23:15 +0000552
John McCallf3735e02010-12-01 04:43:34 +0000553 QualType Ty = E->getType();
Chris Lattner513165e2008-07-25 21:10:04 +0000554 assert(!Ty.isNull() && "UsualUnaryConversions - missing type");
Anton Korobeynikovf0c267e2011-10-14 23:23:15 +0000555
Joey Goulydd7f4562013-01-23 11:56:20 +0000556 // Half FP have to be promoted to float unless it is natively supported
557 if (Ty->isHalfType() && !getLangOpts().NativeHalfType)
Anton Korobeynikovf0c267e2011-10-14 23:23:15 +0000558 return ImpCastExprToType(Res.take(), Context.FloatTy, CK_FloatingCast);
559
John McCallf3735e02010-12-01 04:43:34 +0000560 // Try to perform integral promotions if the object has a theoretically
561 // promotable type.
562 if (Ty->isIntegralOrUnscopedEnumerationType()) {
563 // C99 6.3.1.1p2:
564 //
565 // The following may be used in an expression wherever an int or
566 // unsigned int may be used:
567 // - an object or expression with an integer type whose integer
568 // conversion rank is less than or equal to the rank of int
569 // and unsigned int.
570 // - A bit-field of type _Bool, int, signed int, or unsigned int.
571 //
572 // If an int can represent all values of the original type, the
573 // value is converted to an int; otherwise, it is converted to an
574 // unsigned int. These are called the integer promotions. All
575 // other types are unchanged by the integer promotions.
Anton Korobeynikovf0c267e2011-10-14 23:23:15 +0000576
John McCallf3735e02010-12-01 04:43:34 +0000577 QualType PTy = Context.isPromotableBitField(E);
578 if (!PTy.isNull()) {
John Wiegley01296292011-04-08 18:41:53 +0000579 E = ImpCastExprToType(E, PTy, CK_IntegralCast).take();
580 return Owned(E);
John McCallf3735e02010-12-01 04:43:34 +0000581 }
582 if (Ty->isPromotableIntegerType()) {
583 QualType PT = Context.getPromotedIntegerType(Ty);
John Wiegley01296292011-04-08 18:41:53 +0000584 E = ImpCastExprToType(E, PT, CK_IntegralCast).take();
585 return Owned(E);
John McCallf3735e02010-12-01 04:43:34 +0000586 }
Eli Friedman629ffb92009-08-20 04:21:42 +0000587 }
John Wiegley01296292011-04-08 18:41:53 +0000588 return Owned(E);
Chris Lattner513165e2008-07-25 21:10:04 +0000589}
590
Chris Lattner2ce500f2008-07-25 22:25:12 +0000591/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
Tim Northoverda165072013-01-30 09:46:55 +0000592/// do not have a prototype. Arguments that have type float or __fp16
593/// are promoted to double. All other argument types are converted by
594/// UsualUnaryConversions().
John Wiegley01296292011-04-08 18:41:53 +0000595ExprResult Sema::DefaultArgumentPromotion(Expr *E) {
596 QualType Ty = E->getType();
Chris Lattner2ce500f2008-07-25 22:25:12 +0000597 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type");
Mike Stump11289f42009-09-09 15:08:12 +0000598
John Wiegley01296292011-04-08 18:41:53 +0000599 ExprResult Res = UsualUnaryConversions(E);
600 if (Res.isInvalid())
601 return Owned(E);
602 E = Res.take();
John McCall9bc26772010-12-06 18:36:11 +0000603
Tim Northoverda165072013-01-30 09:46:55 +0000604 // If this is a 'float' or '__fp16' (CVR qualified or typedef) promote to
605 // double.
606 const BuiltinType *BTy = Ty->getAs<BuiltinType>();
607 if (BTy && (BTy->getKind() == BuiltinType::Half ||
608 BTy->getKind() == BuiltinType::Float))
John Wiegley01296292011-04-08 18:41:53 +0000609 E = ImpCastExprToType(E, Context.DoubleTy, CK_FloatingCast).take();
610
John McCall4bb057d2011-08-27 22:06:17 +0000611 // C++ performs lvalue-to-rvalue conversion as a default argument
John McCall0562caa2011-08-29 23:55:37 +0000612 // promotion, even on class types, but note:
613 // C++11 [conv.lval]p2:
614 // When an lvalue-to-rvalue conversion occurs in an unevaluated
615 // operand or a subexpression thereof the value contained in the
616 // referenced object is not accessed. Otherwise, if the glvalue
617 // has a class type, the conversion copy-initializes a temporary
618 // of type T from the glvalue and the result of the conversion
619 // is a prvalue for the temporary.
Eli Friedman05e28012012-01-17 02:13:45 +0000620 // FIXME: add some way to gate this entire thing for correctness in
621 // potentially potentially evaluated contexts.
David Blaikie131fcb42012-08-06 22:47:24 +0000622 if (getLangOpts().CPlusPlus && E->isGLValue() && !isUnevaluatedContext()) {
Eli Friedman05e28012012-01-17 02:13:45 +0000623 ExprResult Temp = PerformCopyInitialization(
624 InitializedEntity::InitializeTemporary(E->getType()),
625 E->getExprLoc(),
626 Owned(E));
627 if (Temp.isInvalid())
628 return ExprError();
629 E = Temp.get();
John McCall29ad95b2011-08-27 01:09:30 +0000630 }
631
John Wiegley01296292011-04-08 18:41:53 +0000632 return Owned(E);
Chris Lattner2ce500f2008-07-25 22:25:12 +0000633}
634
Richard Smith55ce3522012-06-25 20:30:08 +0000635/// Determine the degree of POD-ness for an expression.
636/// Incomplete types are considered POD, since this check can be performed
637/// when we're in an unevaluated context.
638Sema::VarArgKind Sema::isValidVarArgType(const QualType &Ty) {
Jordan Rose3e0ec582012-07-19 18:10:23 +0000639 if (Ty->isIncompleteType()) {
640 if (Ty->isObjCObjectType())
641 return VAK_Invalid;
Richard Smith55ce3522012-06-25 20:30:08 +0000642 return VAK_Valid;
Jordan Rose3e0ec582012-07-19 18:10:23 +0000643 }
644
645 if (Ty.isCXX98PODType(Context))
646 return VAK_Valid;
647
Richard Smith16488472012-11-16 00:53:38 +0000648 // C++11 [expr.call]p7:
649 // Passing a potentially-evaluated argument of class type (Clause 9)
Richard Smith55ce3522012-06-25 20:30:08 +0000650 // having a non-trivial copy constructor, a non-trivial move constructor,
Richard Smith16488472012-11-16 00:53:38 +0000651 // or a non-trivial destructor, with no corresponding parameter,
Richard Smith55ce3522012-06-25 20:30:08 +0000652 // is conditionally-supported with implementation-defined semantics.
Richard Smith2bf7fdb2013-01-02 11:42:31 +0000653 if (getLangOpts().CPlusPlus11 && !Ty->isDependentType())
Richard Smith55ce3522012-06-25 20:30:08 +0000654 if (CXXRecordDecl *Record = Ty->getAsCXXRecordDecl())
Richard Smith16488472012-11-16 00:53:38 +0000655 if (!Record->hasNonTrivialCopyConstructor() &&
656 !Record->hasNonTrivialMoveConstructor() &&
657 !Record->hasNonTrivialDestructor())
Richard Smith55ce3522012-06-25 20:30:08 +0000658 return VAK_ValidInCXX11;
659
660 if (getLangOpts().ObjCAutoRefCount && Ty->isObjCLifetimeType())
661 return VAK_Valid;
662 return VAK_Invalid;
663}
664
665bool Sema::variadicArgumentPODCheck(const Expr *E, VariadicCallType CT) {
666 // Don't allow one to pass an Objective-C interface to a vararg.
667 const QualType & Ty = E->getType();
668
669 // Complain about passing non-POD types through varargs.
670 switch (isValidVarArgType(Ty)) {
671 case VAK_Valid:
672 break;
673 case VAK_ValidInCXX11:
674 DiagRuntimeBehavior(E->getLocStart(), 0,
675 PDiag(diag::warn_cxx98_compat_pass_non_pod_arg_to_vararg)
676 << E->getType() << CT);
677 break;
Jordan Rose3e0ec582012-07-19 18:10:23 +0000678 case VAK_Invalid: {
679 if (Ty->isObjCObjectType())
680 return DiagRuntimeBehavior(E->getLocStart(), 0,
681 PDiag(diag::err_cannot_pass_objc_interface_to_vararg)
682 << Ty << CT);
683
Richard Smith55ce3522012-06-25 20:30:08 +0000684 return DiagRuntimeBehavior(E->getLocStart(), 0,
685 PDiag(diag::warn_cannot_pass_non_pod_arg_to_vararg)
Richard Smith2bf7fdb2013-01-02 11:42:31 +0000686 << getLangOpts().CPlusPlus11 << Ty << CT);
Richard Smith55ce3522012-06-25 20:30:08 +0000687 }
Jordan Rose3e0ec582012-07-19 18:10:23 +0000688 }
Richard Smith55ce3522012-06-25 20:30:08 +0000689 // c++ rules are enforced elsewhere.
690 return false;
691}
692
Chris Lattnera8a7d0f2009-04-12 08:11:20 +0000693/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
Jordan Rose3e0ec582012-07-19 18:10:23 +0000694/// will create a trap if the resulting type is not a POD type.
John Wiegley01296292011-04-08 18:41:53 +0000695ExprResult Sema::DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT,
John McCall31168b02011-06-15 23:02:42 +0000696 FunctionDecl *FDecl) {
Richard Smith7659b122012-06-27 20:29:39 +0000697 if (const BuiltinType *PlaceholderTy = E->getType()->getAsPlaceholderType()) {
John McCall4124c492011-10-17 18:40:02 +0000698 // Strip the unbridged-cast placeholder expression off, if applicable.
699 if (PlaceholderTy->getKind() == BuiltinType::ARCUnbridgedCast &&
700 (CT == VariadicMethod ||
701 (FDecl && FDecl->hasAttr<CFAuditedTransferAttr>()))) {
702 E = stripARCUnbridgedCast(E);
703
704 // Otherwise, do normal placeholder checking.
705 } else {
706 ExprResult ExprRes = CheckPlaceholderExpr(E);
707 if (ExprRes.isInvalid())
708 return ExprError();
709 E = ExprRes.take();
710 }
711 }
Douglas Gregorcbd446d2011-06-17 00:15:10 +0000712
John McCall4124c492011-10-17 18:40:02 +0000713 ExprResult ExprRes = DefaultArgumentPromotion(E);
John Wiegley01296292011-04-08 18:41:53 +0000714 if (ExprRes.isInvalid())
715 return ExprError();
716 E = ExprRes.take();
Mike Stump11289f42009-09-09 15:08:12 +0000717
Richard Smith55ce3522012-06-25 20:30:08 +0000718 // Diagnostics regarding non-POD argument types are
719 // emitted along with format string checking in Sema::CheckFunctionCall().
Richard Smith56471fd2012-06-27 20:23:58 +0000720 if (isValidVarArgType(E->getType()) == VAK_Invalid) {
Richard Smith55ce3522012-06-25 20:30:08 +0000721 // Turn this into a trap.
722 CXXScopeSpec SS;
723 SourceLocation TemplateKWLoc;
724 UnqualifiedId Name;
725 Name.setIdentifier(PP.getIdentifierInfo("__builtin_trap"),
726 E->getLocStart());
727 ExprResult TrapFn = ActOnIdExpression(TUScope, SS, TemplateKWLoc,
728 Name, true, false);
729 if (TrapFn.isInvalid())
730 return ExprError();
John McCall31168b02011-06-15 23:02:42 +0000731
Richard Smith55ce3522012-06-25 20:30:08 +0000732 ExprResult Call = ActOnCallExpr(TUScope, TrapFn.get(),
733 E->getLocStart(), MultiExprArg(),
734 E->getLocEnd());
735 if (Call.isInvalid())
736 return ExprError();
Douglas Gregor347e0f22011-05-21 19:26:31 +0000737
Richard Smith55ce3522012-06-25 20:30:08 +0000738 ExprResult Comma = ActOnBinOp(TUScope, E->getLocStart(), tok::comma,
739 Call.get(), E);
740 if (Comma.isInvalid())
741 return ExprError();
742 return Comma.get();
Douglas Gregor253cadf2011-05-21 16:27:21 +0000743 }
Richard Smith55ce3522012-06-25 20:30:08 +0000744
David Blaikiebbafb8a2012-03-11 07:00:24 +0000745 if (!getLangOpts().CPlusPlus &&
Fariborz Jahanian3854a552012-03-01 23:42:00 +0000746 RequireCompleteType(E->getExprLoc(), E->getType(),
Fariborz Jahanianbf482812012-03-02 17:05:03 +0000747 diag::err_call_incomplete_argument))
Fariborz Jahanian3854a552012-03-01 23:42:00 +0000748 return ExprError();
Richard Smith55ce3522012-06-25 20:30:08 +0000749
John Wiegley01296292011-04-08 18:41:53 +0000750 return Owned(E);
Anders Carlssona7d069d2009-01-16 16:48:51 +0000751}
752
Richard Trieu7aa58f12011-09-02 20:58:51 +0000753/// \brief Converts an integer to complex float type. Helper function of
754/// UsualArithmeticConversions()
755///
756/// \return false if the integer expression is an integer type and is
757/// successfully converted to the complex type.
Richard Trieuba63ce62011-09-09 01:45:06 +0000758static bool handleIntegerToComplexFloatConversion(Sema &S, ExprResult &IntExpr,
759 ExprResult &ComplexExpr,
760 QualType IntTy,
761 QualType ComplexTy,
762 bool SkipCast) {
763 if (IntTy->isComplexType() || IntTy->isRealFloatingType()) return true;
764 if (SkipCast) return false;
765 if (IntTy->isIntegerType()) {
766 QualType fpTy = cast<ComplexType>(ComplexTy)->getElementType();
767 IntExpr = S.ImpCastExprToType(IntExpr.take(), fpTy, CK_IntegralToFloating);
768 IntExpr = S.ImpCastExprToType(IntExpr.take(), ComplexTy,
Richard Trieu7aa58f12011-09-02 20:58:51 +0000769 CK_FloatingRealToComplex);
770 } else {
Richard Trieuba63ce62011-09-09 01:45:06 +0000771 assert(IntTy->isComplexIntegerType());
772 IntExpr = S.ImpCastExprToType(IntExpr.take(), ComplexTy,
Richard Trieu7aa58f12011-09-02 20:58:51 +0000773 CK_IntegralComplexToFloatingComplex);
774 }
775 return false;
776}
777
778/// \brief Takes two complex float types and converts them to the same type.
779/// Helper function of UsualArithmeticConversions()
780static QualType
Richard Trieu5065cdd2011-09-06 18:25:09 +0000781handleComplexFloatToComplexFloatConverstion(Sema &S, ExprResult &LHS,
782 ExprResult &RHS, QualType LHSType,
783 QualType RHSType,
Richard Trieuba63ce62011-09-09 01:45:06 +0000784 bool IsCompAssign) {
Richard Trieu5065cdd2011-09-06 18:25:09 +0000785 int order = S.Context.getFloatingTypeOrder(LHSType, RHSType);
Richard Trieu7aa58f12011-09-02 20:58:51 +0000786
787 if (order < 0) {
788 // _Complex float -> _Complex double
Richard Trieuba63ce62011-09-09 01:45:06 +0000789 if (!IsCompAssign)
Richard Trieu5065cdd2011-09-06 18:25:09 +0000790 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_FloatingComplexCast);
791 return RHSType;
Richard Trieu7aa58f12011-09-02 20:58:51 +0000792 }
793 if (order > 0)
794 // _Complex float -> _Complex double
Richard Trieu5065cdd2011-09-06 18:25:09 +0000795 RHS = S.ImpCastExprToType(RHS.take(), LHSType, CK_FloatingComplexCast);
796 return LHSType;
Richard Trieu7aa58f12011-09-02 20:58:51 +0000797}
798
799/// \brief Converts otherExpr to complex float and promotes complexExpr if
800/// necessary. Helper function of UsualArithmeticConversions()
801static QualType handleOtherComplexFloatConversion(Sema &S,
Richard Trieuba63ce62011-09-09 01:45:06 +0000802 ExprResult &ComplexExpr,
803 ExprResult &OtherExpr,
804 QualType ComplexTy,
805 QualType OtherTy,
806 bool ConvertComplexExpr,
807 bool ConvertOtherExpr) {
808 int order = S.Context.getFloatingTypeOrder(ComplexTy, OtherTy);
Richard Trieu7aa58f12011-09-02 20:58:51 +0000809
810 // If just the complexExpr is complex, the otherExpr needs to be converted,
811 // and the complexExpr might need to be promoted.
812 if (order > 0) { // complexExpr is wider
813 // float -> _Complex double
Richard Trieuba63ce62011-09-09 01:45:06 +0000814 if (ConvertOtherExpr) {
815 QualType fp = cast<ComplexType>(ComplexTy)->getElementType();
816 OtherExpr = S.ImpCastExprToType(OtherExpr.take(), fp, CK_FloatingCast);
817 OtherExpr = S.ImpCastExprToType(OtherExpr.take(), ComplexTy,
Richard Trieu7aa58f12011-09-02 20:58:51 +0000818 CK_FloatingRealToComplex);
819 }
Richard Trieuba63ce62011-09-09 01:45:06 +0000820 return ComplexTy;
Richard Trieu7aa58f12011-09-02 20:58:51 +0000821 }
822
823 // otherTy is at least as wide. Find its corresponding complex type.
Richard Trieuba63ce62011-09-09 01:45:06 +0000824 QualType result = (order == 0 ? ComplexTy :
825 S.Context.getComplexType(OtherTy));
Richard Trieu7aa58f12011-09-02 20:58:51 +0000826
827 // double -> _Complex double
Richard Trieuba63ce62011-09-09 01:45:06 +0000828 if (ConvertOtherExpr)
829 OtherExpr = S.ImpCastExprToType(OtherExpr.take(), result,
Richard Trieu7aa58f12011-09-02 20:58:51 +0000830 CK_FloatingRealToComplex);
831
832 // _Complex float -> _Complex double
Richard Trieuba63ce62011-09-09 01:45:06 +0000833 if (ConvertComplexExpr && order < 0)
834 ComplexExpr = S.ImpCastExprToType(ComplexExpr.take(), result,
Richard Trieu7aa58f12011-09-02 20:58:51 +0000835 CK_FloatingComplexCast);
836
837 return result;
838}
839
840/// \brief Handle arithmetic conversion with complex types. Helper function of
841/// UsualArithmeticConversions()
Richard Trieu5065cdd2011-09-06 18:25:09 +0000842static QualType handleComplexFloatConversion(Sema &S, ExprResult &LHS,
843 ExprResult &RHS, QualType LHSType,
844 QualType RHSType,
Richard Trieuba63ce62011-09-09 01:45:06 +0000845 bool IsCompAssign) {
Richard Trieu7aa58f12011-09-02 20:58:51 +0000846 // if we have an integer operand, the result is the complex type.
Richard Trieu5065cdd2011-09-06 18:25:09 +0000847 if (!handleIntegerToComplexFloatConversion(S, RHS, LHS, RHSType, LHSType,
Richard Trieu7aa58f12011-09-02 20:58:51 +0000848 /*skipCast*/false))
Richard Trieu5065cdd2011-09-06 18:25:09 +0000849 return LHSType;
850 if (!handleIntegerToComplexFloatConversion(S, LHS, RHS, LHSType, RHSType,
Richard Trieuba63ce62011-09-09 01:45:06 +0000851 /*skipCast*/IsCompAssign))
Richard Trieu5065cdd2011-09-06 18:25:09 +0000852 return RHSType;
Richard Trieu7aa58f12011-09-02 20:58:51 +0000853
854 // This handles complex/complex, complex/float, or float/complex.
855 // When both operands are complex, the shorter operand is converted to the
856 // type of the longer, and that is the type of the result. This corresponds
857 // to what is done when combining two real floating-point operands.
858 // The fun begins when size promotion occur across type domains.
859 // From H&S 6.3.4: When one operand is complex and the other is a real
860 // floating-point type, the less precise type is converted, within it's
861 // real or complex domain, to the precision of the other type. For example,
862 // when combining a "long double" with a "double _Complex", the
863 // "double _Complex" is promoted to "long double _Complex".
864
Richard Trieu5065cdd2011-09-06 18:25:09 +0000865 bool LHSComplexFloat = LHSType->isComplexType();
866 bool RHSComplexFloat = RHSType->isComplexType();
Richard Trieu7aa58f12011-09-02 20:58:51 +0000867
868 // If both are complex, just cast to the more precise type.
869 if (LHSComplexFloat && RHSComplexFloat)
Richard Trieu5065cdd2011-09-06 18:25:09 +0000870 return handleComplexFloatToComplexFloatConverstion(S, LHS, RHS,
871 LHSType, RHSType,
Richard Trieuba63ce62011-09-09 01:45:06 +0000872 IsCompAssign);
Richard Trieu7aa58f12011-09-02 20:58:51 +0000873
874 // If only one operand is complex, promote it if necessary and convert the
875 // other operand to complex.
876 if (LHSComplexFloat)
877 return handleOtherComplexFloatConversion(
Richard Trieuba63ce62011-09-09 01:45:06 +0000878 S, LHS, RHS, LHSType, RHSType, /*convertComplexExpr*/!IsCompAssign,
Richard Trieu7aa58f12011-09-02 20:58:51 +0000879 /*convertOtherExpr*/ true);
880
881 assert(RHSComplexFloat);
882 return handleOtherComplexFloatConversion(
Richard Trieu5065cdd2011-09-06 18:25:09 +0000883 S, RHS, LHS, RHSType, LHSType, /*convertComplexExpr*/true,
Richard Trieuba63ce62011-09-09 01:45:06 +0000884 /*convertOtherExpr*/ !IsCompAssign);
Richard Trieu7aa58f12011-09-02 20:58:51 +0000885}
886
887/// \brief Hande arithmetic conversion from integer to float. Helper function
888/// of UsualArithmeticConversions()
Richard Trieuba63ce62011-09-09 01:45:06 +0000889static QualType handleIntToFloatConversion(Sema &S, ExprResult &FloatExpr,
890 ExprResult &IntExpr,
891 QualType FloatTy, QualType IntTy,
892 bool ConvertFloat, bool ConvertInt) {
893 if (IntTy->isIntegerType()) {
894 if (ConvertInt)
Richard Trieu7aa58f12011-09-02 20:58:51 +0000895 // Convert intExpr to the lhs floating point type.
Richard Trieuba63ce62011-09-09 01:45:06 +0000896 IntExpr = S.ImpCastExprToType(IntExpr.take(), FloatTy,
Richard Trieu7aa58f12011-09-02 20:58:51 +0000897 CK_IntegralToFloating);
Richard Trieuba63ce62011-09-09 01:45:06 +0000898 return FloatTy;
Richard Trieu7aa58f12011-09-02 20:58:51 +0000899 }
900
901 // Convert both sides to the appropriate complex float.
Richard Trieuba63ce62011-09-09 01:45:06 +0000902 assert(IntTy->isComplexIntegerType());
903 QualType result = S.Context.getComplexType(FloatTy);
Richard Trieu7aa58f12011-09-02 20:58:51 +0000904
905 // _Complex int -> _Complex float
Richard Trieuba63ce62011-09-09 01:45:06 +0000906 if (ConvertInt)
907 IntExpr = S.ImpCastExprToType(IntExpr.take(), result,
Richard Trieu7aa58f12011-09-02 20:58:51 +0000908 CK_IntegralComplexToFloatingComplex);
909
910 // float -> _Complex float
Richard Trieuba63ce62011-09-09 01:45:06 +0000911 if (ConvertFloat)
912 FloatExpr = S.ImpCastExprToType(FloatExpr.take(), result,
Richard Trieu7aa58f12011-09-02 20:58:51 +0000913 CK_FloatingRealToComplex);
914
915 return result;
916}
917
918/// \brief Handle arithmethic conversion with floating point types. Helper
919/// function of UsualArithmeticConversions()
Richard Trieucfe3f212011-09-06 18:38:41 +0000920static QualType handleFloatConversion(Sema &S, ExprResult &LHS,
921 ExprResult &RHS, QualType LHSType,
Richard Trieuba63ce62011-09-09 01:45:06 +0000922 QualType RHSType, bool IsCompAssign) {
Richard Trieucfe3f212011-09-06 18:38:41 +0000923 bool LHSFloat = LHSType->isRealFloatingType();
924 bool RHSFloat = RHSType->isRealFloatingType();
Richard Trieu7aa58f12011-09-02 20:58:51 +0000925
926 // If we have two real floating types, convert the smaller operand
927 // to the bigger result.
928 if (LHSFloat && RHSFloat) {
Richard Trieucfe3f212011-09-06 18:38:41 +0000929 int order = S.Context.getFloatingTypeOrder(LHSType, RHSType);
Richard Trieu7aa58f12011-09-02 20:58:51 +0000930 if (order > 0) {
Richard Trieucfe3f212011-09-06 18:38:41 +0000931 RHS = S.ImpCastExprToType(RHS.take(), LHSType, CK_FloatingCast);
932 return LHSType;
Richard Trieu7aa58f12011-09-02 20:58:51 +0000933 }
934
935 assert(order < 0 && "illegal float comparison");
Richard Trieuba63ce62011-09-09 01:45:06 +0000936 if (!IsCompAssign)
Richard Trieucfe3f212011-09-06 18:38:41 +0000937 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_FloatingCast);
938 return RHSType;
Richard Trieu7aa58f12011-09-02 20:58:51 +0000939 }
940
941 if (LHSFloat)
Richard Trieucfe3f212011-09-06 18:38:41 +0000942 return handleIntToFloatConversion(S, LHS, RHS, LHSType, RHSType,
Richard Trieuba63ce62011-09-09 01:45:06 +0000943 /*convertFloat=*/!IsCompAssign,
Richard Trieu7aa58f12011-09-02 20:58:51 +0000944 /*convertInt=*/ true);
945 assert(RHSFloat);
Richard Trieucfe3f212011-09-06 18:38:41 +0000946 return handleIntToFloatConversion(S, RHS, LHS, RHSType, LHSType,
Richard Trieu7aa58f12011-09-02 20:58:51 +0000947 /*convertInt=*/ true,
Richard Trieuba63ce62011-09-09 01:45:06 +0000948 /*convertFloat=*/!IsCompAssign);
Richard Trieu7aa58f12011-09-02 20:58:51 +0000949}
950
Bill Schmidteb03ae22013-02-01 15:34:29 +0000951typedef ExprResult PerformCastFn(Sema &S, Expr *operand, QualType toType);
Richard Trieu7aa58f12011-09-02 20:58:51 +0000952
Bill Schmidteb03ae22013-02-01 15:34:29 +0000953namespace {
954/// These helper callbacks are placed in an anonymous namespace to
955/// permit their use as function template parameters.
956ExprResult doIntegralCast(Sema &S, Expr *op, QualType toType) {
957 return S.ImpCastExprToType(op, toType, CK_IntegralCast);
958}
Richard Trieu7aa58f12011-09-02 20:58:51 +0000959
Bill Schmidteb03ae22013-02-01 15:34:29 +0000960ExprResult doComplexIntegralCast(Sema &S, Expr *op, QualType toType) {
961 return S.ImpCastExprToType(op, S.Context.getComplexType(toType),
962 CK_IntegralComplexCast);
963}
Richard Trieu7aa58f12011-09-02 20:58:51 +0000964}
965
966/// \brief Handle integer arithmetic conversions. Helper function of
967/// UsualArithmeticConversions()
Bill Schmidteb03ae22013-02-01 15:34:29 +0000968template <PerformCastFn doLHSCast, PerformCastFn doRHSCast>
Richard Trieu9a52fbb2011-09-06 19:52:52 +0000969static QualType handleIntegerConversion(Sema &S, ExprResult &LHS,
970 ExprResult &RHS, QualType LHSType,
Richard Trieuba63ce62011-09-09 01:45:06 +0000971 QualType RHSType, bool IsCompAssign) {
Richard Trieu7aa58f12011-09-02 20:58:51 +0000972 // The rules for this case are in C99 6.3.1.8
Richard Trieu9a52fbb2011-09-06 19:52:52 +0000973 int order = S.Context.getIntegerTypeOrder(LHSType, RHSType);
974 bool LHSSigned = LHSType->hasSignedIntegerRepresentation();
975 bool RHSSigned = RHSType->hasSignedIntegerRepresentation();
976 if (LHSSigned == RHSSigned) {
Richard Trieu7aa58f12011-09-02 20:58:51 +0000977 // Same signedness; use the higher-ranked type
978 if (order >= 0) {
Bill Schmidteb03ae22013-02-01 15:34:29 +0000979 RHS = (*doRHSCast)(S, RHS.take(), LHSType);
Richard Trieu9a52fbb2011-09-06 19:52:52 +0000980 return LHSType;
Richard Trieuba63ce62011-09-09 01:45:06 +0000981 } else if (!IsCompAssign)
Bill Schmidteb03ae22013-02-01 15:34:29 +0000982 LHS = (*doLHSCast)(S, LHS.take(), RHSType);
Richard Trieu9a52fbb2011-09-06 19:52:52 +0000983 return RHSType;
984 } else if (order != (LHSSigned ? 1 : -1)) {
Richard Trieu7aa58f12011-09-02 20:58:51 +0000985 // The unsigned type has greater than or equal rank to the
986 // signed type, so use the unsigned type
Richard Trieu9a52fbb2011-09-06 19:52:52 +0000987 if (RHSSigned) {
Bill Schmidteb03ae22013-02-01 15:34:29 +0000988 RHS = (*doRHSCast)(S, RHS.take(), LHSType);
Richard Trieu9a52fbb2011-09-06 19:52:52 +0000989 return LHSType;
Richard Trieuba63ce62011-09-09 01:45:06 +0000990 } else if (!IsCompAssign)
Bill Schmidteb03ae22013-02-01 15:34:29 +0000991 LHS = (*doLHSCast)(S, LHS.take(), RHSType);
Richard Trieu9a52fbb2011-09-06 19:52:52 +0000992 return RHSType;
993 } else if (S.Context.getIntWidth(LHSType) != S.Context.getIntWidth(RHSType)) {
Richard Trieu7aa58f12011-09-02 20:58:51 +0000994 // The two types are different widths; if we are here, that
995 // means the signed type is larger than the unsigned type, so
996 // use the signed type.
Richard Trieu9a52fbb2011-09-06 19:52:52 +0000997 if (LHSSigned) {
Bill Schmidteb03ae22013-02-01 15:34:29 +0000998 RHS = (*doRHSCast)(S, RHS.take(), LHSType);
Richard Trieu9a52fbb2011-09-06 19:52:52 +0000999 return LHSType;
Richard Trieuba63ce62011-09-09 01:45:06 +00001000 } else if (!IsCompAssign)
Bill Schmidteb03ae22013-02-01 15:34:29 +00001001 LHS = (*doLHSCast)(S, LHS.take(), RHSType);
Richard Trieu9a52fbb2011-09-06 19:52:52 +00001002 return RHSType;
Richard Trieu7aa58f12011-09-02 20:58:51 +00001003 } else {
1004 // The signed type is higher-ranked than the unsigned type,
1005 // but isn't actually any bigger (like unsigned int and long
1006 // on most 32-bit systems). Use the unsigned type corresponding
1007 // to the signed type.
1008 QualType result =
Richard Trieu9a52fbb2011-09-06 19:52:52 +00001009 S.Context.getCorrespondingUnsignedType(LHSSigned ? LHSType : RHSType);
Bill Schmidteb03ae22013-02-01 15:34:29 +00001010 RHS = (*doRHSCast)(S, RHS.take(), result);
Richard Trieuba63ce62011-09-09 01:45:06 +00001011 if (!IsCompAssign)
Bill Schmidteb03ae22013-02-01 15:34:29 +00001012 LHS = (*doLHSCast)(S, LHS.take(), result);
Richard Trieu7aa58f12011-09-02 20:58:51 +00001013 return result;
1014 }
1015}
1016
Bill Schmidteb03ae22013-02-01 15:34:29 +00001017/// \brief Handle conversions with GCC complex int extension. Helper function
1018/// of UsualArithmeticConversions()
1019static QualType handleComplexIntConversion(Sema &S, ExprResult &LHS,
1020 ExprResult &RHS, QualType LHSType,
1021 QualType RHSType,
1022 bool IsCompAssign) {
1023 const ComplexType *LHSComplexInt = LHSType->getAsComplexIntegerType();
1024 const ComplexType *RHSComplexInt = RHSType->getAsComplexIntegerType();
1025
1026 if (LHSComplexInt && RHSComplexInt) {
1027 QualType LHSEltType = LHSComplexInt->getElementType();
1028 QualType RHSEltType = RHSComplexInt->getElementType();
1029 QualType ScalarType =
1030 handleIntegerConversion<doComplexIntegralCast, doComplexIntegralCast>
1031 (S, LHS, RHS, LHSEltType, RHSEltType, IsCompAssign);
1032
1033 return S.Context.getComplexType(ScalarType);
1034 }
1035
1036 if (LHSComplexInt) {
1037 QualType LHSEltType = LHSComplexInt->getElementType();
1038 QualType ScalarType =
1039 handleIntegerConversion<doComplexIntegralCast, doIntegralCast>
1040 (S, LHS, RHS, LHSEltType, RHSType, IsCompAssign);
1041 QualType ComplexType = S.Context.getComplexType(ScalarType);
1042 RHS = S.ImpCastExprToType(RHS.take(), ComplexType,
1043 CK_IntegralRealToComplex);
1044
1045 return ComplexType;
1046 }
1047
1048 assert(RHSComplexInt);
1049
1050 QualType RHSEltType = RHSComplexInt->getElementType();
1051 QualType ScalarType =
1052 handleIntegerConversion<doIntegralCast, doComplexIntegralCast>
1053 (S, LHS, RHS, LHSType, RHSEltType, IsCompAssign);
1054 QualType ComplexType = S.Context.getComplexType(ScalarType);
1055
1056 if (!IsCompAssign)
1057 LHS = S.ImpCastExprToType(LHS.take(), ComplexType,
1058 CK_IntegralRealToComplex);
1059 return ComplexType;
1060}
1061
Chris Lattner513165e2008-07-25 21:10:04 +00001062/// UsualArithmeticConversions - Performs various conversions that are common to
1063/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this
Mike Stump11289f42009-09-09 15:08:12 +00001064/// routine returns the first non-arithmetic type found. The client is
Chris Lattner513165e2008-07-25 21:10:04 +00001065/// responsible for emitting appropriate error diagnostics.
Richard Trieu9a52fbb2011-09-06 19:52:52 +00001066QualType Sema::UsualArithmeticConversions(ExprResult &LHS, ExprResult &RHS,
Richard Trieuba63ce62011-09-09 01:45:06 +00001067 bool IsCompAssign) {
1068 if (!IsCompAssign) {
Richard Trieu9a52fbb2011-09-06 19:52:52 +00001069 LHS = UsualUnaryConversions(LHS.take());
1070 if (LHS.isInvalid())
John Wiegley01296292011-04-08 18:41:53 +00001071 return QualType();
1072 }
Eli Friedman8b7b1b12009-03-28 01:22:36 +00001073
Richard Trieu9a52fbb2011-09-06 19:52:52 +00001074 RHS = UsualUnaryConversions(RHS.take());
1075 if (RHS.isInvalid())
John Wiegley01296292011-04-08 18:41:53 +00001076 return QualType();
Douglas Gregora11693b2008-11-12 17:17:38 +00001077
Mike Stump11289f42009-09-09 15:08:12 +00001078 // For conversion purposes, we ignore any qualifiers.
Chris Lattner513165e2008-07-25 21:10:04 +00001079 // For example, "const float" and "float" are equivalent.
Richard Trieu9a52fbb2011-09-06 19:52:52 +00001080 QualType LHSType =
1081 Context.getCanonicalType(LHS.get()->getType()).getUnqualifiedType();
1082 QualType RHSType =
1083 Context.getCanonicalType(RHS.get()->getType()).getUnqualifiedType();
Douglas Gregora11693b2008-11-12 17:17:38 +00001084
Eli Friedman93ee5ca2012-06-16 02:19:17 +00001085 // For conversion purposes, we ignore any atomic qualifier on the LHS.
1086 if (const AtomicType *AtomicLHS = LHSType->getAs<AtomicType>())
1087 LHSType = AtomicLHS->getValueType();
1088
Douglas Gregora11693b2008-11-12 17:17:38 +00001089 // If both types are identical, no conversion is needed.
Richard Trieu9a52fbb2011-09-06 19:52:52 +00001090 if (LHSType == RHSType)
1091 return LHSType;
Douglas Gregora11693b2008-11-12 17:17:38 +00001092
1093 // If either side is a non-arithmetic type (e.g. a pointer), we are done.
1094 // The caller can deal with this (e.g. pointer + int).
Richard Trieu9a52fbb2011-09-06 19:52:52 +00001095 if (!LHSType->isArithmeticType() || !RHSType->isArithmeticType())
Eli Friedman93ee5ca2012-06-16 02:19:17 +00001096 return QualType();
Douglas Gregora11693b2008-11-12 17:17:38 +00001097
John McCalld005ac92010-11-13 08:17:45 +00001098 // Apply unary and bitfield promotions to the LHS's type.
Richard Trieu9a52fbb2011-09-06 19:52:52 +00001099 QualType LHSUnpromotedType = LHSType;
1100 if (LHSType->isPromotableIntegerType())
1101 LHSType = Context.getPromotedIntegerType(LHSType);
1102 QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(LHS.get());
Douglas Gregord2c2d172009-05-02 00:36:19 +00001103 if (!LHSBitfieldPromoteTy.isNull())
Richard Trieu9a52fbb2011-09-06 19:52:52 +00001104 LHSType = LHSBitfieldPromoteTy;
Richard Trieuba63ce62011-09-09 01:45:06 +00001105 if (LHSType != LHSUnpromotedType && !IsCompAssign)
Richard Trieu9a52fbb2011-09-06 19:52:52 +00001106 LHS = ImpCastExprToType(LHS.take(), LHSType, CK_IntegralCast);
Douglas Gregord2c2d172009-05-02 00:36:19 +00001107
John McCalld005ac92010-11-13 08:17:45 +00001108 // If both types are identical, no conversion is needed.
Richard Trieu9a52fbb2011-09-06 19:52:52 +00001109 if (LHSType == RHSType)
1110 return LHSType;
John McCalld005ac92010-11-13 08:17:45 +00001111
1112 // At this point, we have two different arithmetic types.
1113
1114 // Handle complex types first (C99 6.3.1.8p1).
Richard Trieu9a52fbb2011-09-06 19:52:52 +00001115 if (LHSType->isComplexType() || RHSType->isComplexType())
1116 return handleComplexFloatConversion(*this, LHS, RHS, LHSType, RHSType,
Richard Trieuba63ce62011-09-09 01:45:06 +00001117 IsCompAssign);
John McCalld005ac92010-11-13 08:17:45 +00001118
1119 // Now handle "real" floating types (i.e. float, double, long double).
Richard Trieu9a52fbb2011-09-06 19:52:52 +00001120 if (LHSType->isRealFloatingType() || RHSType->isRealFloatingType())
1121 return handleFloatConversion(*this, LHS, RHS, LHSType, RHSType,
Richard Trieuba63ce62011-09-09 01:45:06 +00001122 IsCompAssign);
John McCalld005ac92010-11-13 08:17:45 +00001123
1124 // Handle GCC complex int extension.
Richard Trieu9a52fbb2011-09-06 19:52:52 +00001125 if (LHSType->isComplexIntegerType() || RHSType->isComplexIntegerType())
Benjamin Kramer499c68b2011-09-06 19:57:14 +00001126 return handleComplexIntConversion(*this, LHS, RHS, LHSType, RHSType,
Richard Trieuba63ce62011-09-09 01:45:06 +00001127 IsCompAssign);
John McCalld005ac92010-11-13 08:17:45 +00001128
1129 // Finally, we have two differing integer types.
Bill Schmidteb03ae22013-02-01 15:34:29 +00001130 return handleIntegerConversion<doIntegralCast, doIntegralCast>
1131 (*this, LHS, RHS, LHSType, RHSType, IsCompAssign);
Douglas Gregora11693b2008-11-12 17:17:38 +00001132}
1133
Bill Schmidteb03ae22013-02-01 15:34:29 +00001134
Chris Lattner513165e2008-07-25 21:10:04 +00001135//===----------------------------------------------------------------------===//
1136// Semantic Analysis for various Expression Types
1137//===----------------------------------------------------------------------===//
1138
1139
Peter Collingbourne91147592011-04-15 00:35:48 +00001140ExprResult
1141Sema::ActOnGenericSelectionExpr(SourceLocation KeyLoc,
1142 SourceLocation DefaultLoc,
1143 SourceLocation RParenLoc,
1144 Expr *ControllingExpr,
Richard Trieuba63ce62011-09-09 01:45:06 +00001145 MultiTypeArg ArgTypes,
1146 MultiExprArg ArgExprs) {
1147 unsigned NumAssocs = ArgTypes.size();
1148 assert(NumAssocs == ArgExprs.size());
Peter Collingbourne91147592011-04-15 00:35:48 +00001149
Benjamin Kramercc4c49d2012-08-23 23:38:35 +00001150 ParsedType *ParsedTypes = ArgTypes.data();
1151 Expr **Exprs = ArgExprs.data();
Peter Collingbourne91147592011-04-15 00:35:48 +00001152
1153 TypeSourceInfo **Types = new TypeSourceInfo*[NumAssocs];
1154 for (unsigned i = 0; i < NumAssocs; ++i) {
1155 if (ParsedTypes[i])
1156 (void) GetTypeFromParser(ParsedTypes[i], &Types[i]);
1157 else
1158 Types[i] = 0;
1159 }
1160
1161 ExprResult ER = CreateGenericSelectionExpr(KeyLoc, DefaultLoc, RParenLoc,
1162 ControllingExpr, Types, Exprs,
1163 NumAssocs);
Benjamin Kramer34623762011-04-15 11:21:57 +00001164 delete [] Types;
Peter Collingbourne91147592011-04-15 00:35:48 +00001165 return ER;
1166}
1167
1168ExprResult
1169Sema::CreateGenericSelectionExpr(SourceLocation KeyLoc,
1170 SourceLocation DefaultLoc,
1171 SourceLocation RParenLoc,
1172 Expr *ControllingExpr,
1173 TypeSourceInfo **Types,
1174 Expr **Exprs,
1175 unsigned NumAssocs) {
John McCall587b3482013-02-12 02:08:12 +00001176 if (ControllingExpr->getType()->isPlaceholderType()) {
1177 ExprResult result = CheckPlaceholderExpr(ControllingExpr);
1178 if (result.isInvalid()) return ExprError();
1179 ControllingExpr = result.take();
1180 }
1181
Peter Collingbourne91147592011-04-15 00:35:48 +00001182 bool TypeErrorFound = false,
1183 IsResultDependent = ControllingExpr->isTypeDependent(),
1184 ContainsUnexpandedParameterPack
1185 = ControllingExpr->containsUnexpandedParameterPack();
1186
1187 for (unsigned i = 0; i < NumAssocs; ++i) {
1188 if (Exprs[i]->containsUnexpandedParameterPack())
1189 ContainsUnexpandedParameterPack = true;
1190
1191 if (Types[i]) {
1192 if (Types[i]->getType()->containsUnexpandedParameterPack())
1193 ContainsUnexpandedParameterPack = true;
1194
1195 if (Types[i]->getType()->isDependentType()) {
1196 IsResultDependent = true;
1197 } else {
Benjamin Kramere56f3932011-12-23 17:00:35 +00001198 // C11 6.5.1.1p2 "The type name in a generic association shall specify a
Peter Collingbourne91147592011-04-15 00:35:48 +00001199 // complete object type other than a variably modified type."
1200 unsigned D = 0;
1201 if (Types[i]->getType()->isIncompleteType())
1202 D = diag::err_assoc_type_incomplete;
1203 else if (!Types[i]->getType()->isObjectType())
1204 D = diag::err_assoc_type_nonobject;
1205 else if (Types[i]->getType()->isVariablyModifiedType())
1206 D = diag::err_assoc_type_variably_modified;
1207
1208 if (D != 0) {
1209 Diag(Types[i]->getTypeLoc().getBeginLoc(), D)
1210 << Types[i]->getTypeLoc().getSourceRange()
1211 << Types[i]->getType();
1212 TypeErrorFound = true;
1213 }
1214
Benjamin Kramere56f3932011-12-23 17:00:35 +00001215 // C11 6.5.1.1p2 "No two generic associations in the same generic
Peter Collingbourne91147592011-04-15 00:35:48 +00001216 // selection shall specify compatible types."
1217 for (unsigned j = i+1; j < NumAssocs; ++j)
1218 if (Types[j] && !Types[j]->getType()->isDependentType() &&
1219 Context.typesAreCompatible(Types[i]->getType(),
1220 Types[j]->getType())) {
1221 Diag(Types[j]->getTypeLoc().getBeginLoc(),
1222 diag::err_assoc_compatible_types)
1223 << Types[j]->getTypeLoc().getSourceRange()
1224 << Types[j]->getType()
1225 << Types[i]->getType();
1226 Diag(Types[i]->getTypeLoc().getBeginLoc(),
1227 diag::note_compat_assoc)
1228 << Types[i]->getTypeLoc().getSourceRange()
1229 << Types[i]->getType();
1230 TypeErrorFound = true;
1231 }
1232 }
1233 }
1234 }
1235 if (TypeErrorFound)
1236 return ExprError();
1237
1238 // If we determined that the generic selection is result-dependent, don't
1239 // try to compute the result expression.
1240 if (IsResultDependent)
1241 return Owned(new (Context) GenericSelectionExpr(
1242 Context, KeyLoc, ControllingExpr,
Benjamin Kramerc215e762012-08-24 11:54:20 +00001243 llvm::makeArrayRef(Types, NumAssocs),
1244 llvm::makeArrayRef(Exprs, NumAssocs),
1245 DefaultLoc, RParenLoc, ContainsUnexpandedParameterPack));
Peter Collingbourne91147592011-04-15 00:35:48 +00001246
Chris Lattner0e62c1c2011-07-23 10:55:15 +00001247 SmallVector<unsigned, 1> CompatIndices;
Peter Collingbourne91147592011-04-15 00:35:48 +00001248 unsigned DefaultIndex = -1U;
1249 for (unsigned i = 0; i < NumAssocs; ++i) {
1250 if (!Types[i])
1251 DefaultIndex = i;
1252 else if (Context.typesAreCompatible(ControllingExpr->getType(),
1253 Types[i]->getType()))
1254 CompatIndices.push_back(i);
1255 }
1256
Benjamin Kramere56f3932011-12-23 17:00:35 +00001257 // C11 6.5.1.1p2 "The controlling expression of a generic selection shall have
Peter Collingbourne91147592011-04-15 00:35:48 +00001258 // type compatible with at most one of the types named in its generic
1259 // association list."
1260 if (CompatIndices.size() > 1) {
1261 // We strip parens here because the controlling expression is typically
1262 // parenthesized in macro definitions.
1263 ControllingExpr = ControllingExpr->IgnoreParens();
1264 Diag(ControllingExpr->getLocStart(), diag::err_generic_sel_multi_match)
1265 << ControllingExpr->getSourceRange() << ControllingExpr->getType()
1266 << (unsigned) CompatIndices.size();
Chris Lattner0e62c1c2011-07-23 10:55:15 +00001267 for (SmallVector<unsigned, 1>::iterator I = CompatIndices.begin(),
Peter Collingbourne91147592011-04-15 00:35:48 +00001268 E = CompatIndices.end(); I != E; ++I) {
1269 Diag(Types[*I]->getTypeLoc().getBeginLoc(),
1270 diag::note_compat_assoc)
1271 << Types[*I]->getTypeLoc().getSourceRange()
1272 << Types[*I]->getType();
1273 }
1274 return ExprError();
1275 }
1276
Benjamin Kramere56f3932011-12-23 17:00:35 +00001277 // C11 6.5.1.1p2 "If a generic selection has no default generic association,
Peter Collingbourne91147592011-04-15 00:35:48 +00001278 // its controlling expression shall have type compatible with exactly one of
1279 // the types named in its generic association list."
1280 if (DefaultIndex == -1U && CompatIndices.size() == 0) {
1281 // We strip parens here because the controlling expression is typically
1282 // parenthesized in macro definitions.
1283 ControllingExpr = ControllingExpr->IgnoreParens();
1284 Diag(ControllingExpr->getLocStart(), diag::err_generic_sel_no_match)
1285 << ControllingExpr->getSourceRange() << ControllingExpr->getType();
1286 return ExprError();
1287 }
1288
Benjamin Kramere56f3932011-12-23 17:00:35 +00001289 // C11 6.5.1.1p3 "If a generic selection has a generic association with a
Peter Collingbourne91147592011-04-15 00:35:48 +00001290 // type name that is compatible with the type of the controlling expression,
1291 // then the result expression of the generic selection is the expression
1292 // in that generic association. Otherwise, the result expression of the
1293 // generic selection is the expression in the default generic association."
1294 unsigned ResultIndex =
1295 CompatIndices.size() ? CompatIndices[0] : DefaultIndex;
1296
1297 return Owned(new (Context) GenericSelectionExpr(
1298 Context, KeyLoc, ControllingExpr,
Benjamin Kramerc215e762012-08-24 11:54:20 +00001299 llvm::makeArrayRef(Types, NumAssocs),
1300 llvm::makeArrayRef(Exprs, NumAssocs),
1301 DefaultLoc, RParenLoc, ContainsUnexpandedParameterPack,
Peter Collingbourne91147592011-04-15 00:35:48 +00001302 ResultIndex));
1303}
1304
Richard Smith75b67d62012-03-08 01:34:56 +00001305/// getUDSuffixLoc - Create a SourceLocation for a ud-suffix, given the
1306/// location of the token and the offset of the ud-suffix within it.
1307static SourceLocation getUDSuffixLoc(Sema &S, SourceLocation TokLoc,
1308 unsigned Offset) {
1309 return Lexer::AdvanceToTokenCharacter(TokLoc, Offset, S.getSourceManager(),
David Blaikiebbafb8a2012-03-11 07:00:24 +00001310 S.getLangOpts());
Richard Smith75b67d62012-03-08 01:34:56 +00001311}
1312
Richard Smithbcc22fc2012-03-09 08:00:36 +00001313/// BuildCookedLiteralOperatorCall - A user-defined literal was found. Look up
1314/// the corresponding cooked (non-raw) literal operator, and build a call to it.
1315static ExprResult BuildCookedLiteralOperatorCall(Sema &S, Scope *Scope,
1316 IdentifierInfo *UDSuffix,
1317 SourceLocation UDSuffixLoc,
1318 ArrayRef<Expr*> Args,
1319 SourceLocation LitEndLoc) {
1320 assert(Args.size() <= 2 && "too many arguments for literal operator");
1321
1322 QualType ArgTy[2];
1323 for (unsigned ArgIdx = 0; ArgIdx != Args.size(); ++ArgIdx) {
1324 ArgTy[ArgIdx] = Args[ArgIdx]->getType();
1325 if (ArgTy[ArgIdx]->isArrayType())
1326 ArgTy[ArgIdx] = S.Context.getArrayDecayedType(ArgTy[ArgIdx]);
1327 }
1328
1329 DeclarationName OpName =
1330 S.Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix);
1331 DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc);
1332 OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc);
1333
1334 LookupResult R(S, OpName, UDSuffixLoc, Sema::LookupOrdinaryName);
1335 if (S.LookupLiteralOperator(Scope, R, llvm::makeArrayRef(ArgTy, Args.size()),
1336 /*AllowRawAndTemplate*/false) == Sema::LOLR_Error)
1337 return ExprError();
1338
1339 return S.BuildLiteralOperatorCall(R, OpNameInfo, Args, LitEndLoc);
1340}
1341
Steve Naroff83895f72007-09-16 03:34:24 +00001342/// ActOnStringLiteral - The specified tokens were lexed as pasted string
Chris Lattner5b183d82006-11-10 05:03:26 +00001343/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string
1344/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from
1345/// multiple tokens. However, the common case is that StringToks points to one
1346/// string.
Sebastian Redlffbcf962009-01-18 18:53:16 +00001347///
John McCalldadc5752010-08-24 06:29:42 +00001348ExprResult
Richard Smithbcc22fc2012-03-09 08:00:36 +00001349Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks,
1350 Scope *UDLScope) {
Chris Lattner5b183d82006-11-10 05:03:26 +00001351 assert(NumStringToks && "Must have at least one string!");
1352
Chris Lattner8a24e582009-01-16 18:51:42 +00001353 StringLiteralParser Literal(StringToks, NumStringToks, PP);
Steve Naroff4f88b312007-03-13 22:37:02 +00001354 if (Literal.hadError)
Sebastian Redlffbcf962009-01-18 18:53:16 +00001355 return ExprError();
Chris Lattner5b183d82006-11-10 05:03:26 +00001356
Chris Lattner0e62c1c2011-07-23 10:55:15 +00001357 SmallVector<SourceLocation, 4> StringTokLocs;
Chris Lattner5b183d82006-11-10 05:03:26 +00001358 for (unsigned i = 0; i != NumStringToks; ++i)
1359 StringTokLocs.push_back(StringToks[i].getLocation());
Chris Lattner36fc8792008-02-11 00:02:17 +00001360
Chris Lattner36fc8792008-02-11 00:02:17 +00001361 QualType StrTy = Context.CharTy;
Douglas Gregorfb65e592011-07-27 05:40:30 +00001362 if (Literal.isWide())
Anders Carlsson6b06e182011-04-06 18:42:48 +00001363 StrTy = Context.getWCharType();
Douglas Gregorfb65e592011-07-27 05:40:30 +00001364 else if (Literal.isUTF16())
1365 StrTy = Context.Char16Ty;
1366 else if (Literal.isUTF32())
1367 StrTy = Context.Char32Ty;
Eli Friedmanfcec6302011-11-01 02:23:42 +00001368 else if (Literal.isPascal())
Anders Carlsson6b06e182011-04-06 18:42:48 +00001369 StrTy = Context.UnsignedCharTy;
Douglas Gregoraa1e21d2008-09-12 00:47:35 +00001370
Douglas Gregorfb65e592011-07-27 05:40:30 +00001371 StringLiteral::StringKind Kind = StringLiteral::Ascii;
1372 if (Literal.isWide())
1373 Kind = StringLiteral::Wide;
1374 else if (Literal.isUTF8())
1375 Kind = StringLiteral::UTF8;
1376 else if (Literal.isUTF16())
1377 Kind = StringLiteral::UTF16;
1378 else if (Literal.isUTF32())
1379 Kind = StringLiteral::UTF32;
1380
Douglas Gregoraa1e21d2008-09-12 00:47:35 +00001381 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
David Blaikiebbafb8a2012-03-11 07:00:24 +00001382 if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings)
Douglas Gregoraa1e21d2008-09-12 00:47:35 +00001383 StrTy.addConst();
Sebastian Redlffbcf962009-01-18 18:53:16 +00001384
Chris Lattner36fc8792008-02-11 00:02:17 +00001385 // Get an array type for the string, according to C99 6.4.5. This includes
1386 // the nul terminator character as well as the string length for pascal
1387 // strings.
1388 StrTy = Context.getConstantArrayType(StrTy,
Chris Lattnerd42c29f2009-02-26 23:01:51 +00001389 llvm::APInt(32, Literal.GetNumStringChars()+1),
Chris Lattner36fc8792008-02-11 00:02:17 +00001390 ArrayType::Normal, 0);
Mike Stump11289f42009-09-09 15:08:12 +00001391
Chris Lattner5b183d82006-11-10 05:03:26 +00001392 // Pass &StringTokLocs[0], StringTokLocs.size() to factory!
Richard Smithc67fdd42012-03-07 08:35:16 +00001393 StringLiteral *Lit = StringLiteral::Create(Context, Literal.GetString(),
1394 Kind, Literal.Pascal, StrTy,
1395 &StringTokLocs[0],
1396 StringTokLocs.size());
1397 if (Literal.getUDSuffix().empty())
1398 return Owned(Lit);
1399
1400 // We're building a user-defined literal.
1401 IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix());
Richard Smith75b67d62012-03-08 01:34:56 +00001402 SourceLocation UDSuffixLoc =
1403 getUDSuffixLoc(*this, StringTokLocs[Literal.getUDSuffixToken()],
1404 Literal.getUDSuffixOffset());
Richard Smithc67fdd42012-03-07 08:35:16 +00001405
Richard Smithbcc22fc2012-03-09 08:00:36 +00001406 // Make sure we're allowed user-defined literals here.
1407 if (!UDLScope)
1408 return ExprError(Diag(UDSuffixLoc, diag::err_invalid_string_udl));
1409
Richard Smithc67fdd42012-03-07 08:35:16 +00001410 // C++11 [lex.ext]p5: The literal L is treated as a call of the form
1411 // operator "" X (str, len)
1412 QualType SizeType = Context.getSizeType();
1413 llvm::APInt Len(Context.getIntWidth(SizeType), Literal.GetNumStringChars());
1414 IntegerLiteral *LenArg = IntegerLiteral::Create(Context, Len, SizeType,
1415 StringTokLocs[0]);
1416 Expr *Args[] = { Lit, LenArg };
Richard Smithbcc22fc2012-03-09 08:00:36 +00001417 return BuildCookedLiteralOperatorCall(*this, UDLScope, UDSuffix, UDSuffixLoc,
1418 Args, StringTokLocs.back());
Chris Lattner5b183d82006-11-10 05:03:26 +00001419}
1420
John McCalldadc5752010-08-24 06:29:42 +00001421ExprResult
John McCall7decc9e2010-11-18 06:31:45 +00001422Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
John McCallf4cd4f92011-02-09 01:13:10 +00001423 SourceLocation Loc,
1424 const CXXScopeSpec *SS) {
Abramo Bagnarad6d2f182010-08-11 22:01:17 +00001425 DeclarationNameInfo NameInfo(D->getDeclName(), Loc);
John McCall7decc9e2010-11-18 06:31:45 +00001426 return BuildDeclRefExpr(D, Ty, VK, NameInfo, SS);
Abramo Bagnarad6d2f182010-08-11 22:01:17 +00001427}
1428
John McCallf4cd4f92011-02-09 01:13:10 +00001429/// BuildDeclRefExpr - Build an expression that references a
1430/// declaration that does not require a closure capture.
John McCalldadc5752010-08-24 06:29:42 +00001431ExprResult
John McCallf4cd4f92011-02-09 01:13:10 +00001432Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
Abramo Bagnarad6d2f182010-08-11 22:01:17 +00001433 const DeclarationNameInfo &NameInfo,
1434 const CXXScopeSpec *SS) {
David Blaikiebbafb8a2012-03-11 07:00:24 +00001435 if (getLangOpts().CUDA)
Peter Collingbourne7277fe82011-10-02 23:49:40 +00001436 if (const FunctionDecl *Caller = dyn_cast<FunctionDecl>(CurContext))
1437 if (const FunctionDecl *Callee = dyn_cast<FunctionDecl>(D)) {
1438 CUDAFunctionTarget CallerTarget = IdentifyCUDATarget(Caller),
1439 CalleeTarget = IdentifyCUDATarget(Callee);
1440 if (CheckCUDATarget(CallerTarget, CalleeTarget)) {
1441 Diag(NameInfo.getLoc(), diag::err_ref_bad_target)
1442 << CalleeTarget << D->getIdentifier() << CallerTarget;
1443 Diag(D->getLocation(), diag::note_previous_decl)
1444 << D->getIdentifier();
1445 return ExprError();
1446 }
1447 }
1448
John McCall113bee02012-03-10 09:33:50 +00001449 bool refersToEnclosingScope =
1450 (CurContext != D->getDeclContext() &&
1451 D->getDeclContext()->isFunctionOrMethod());
1452
Eli Friedmanfa0df832012-02-02 03:46:19 +00001453 DeclRefExpr *E = DeclRefExpr::Create(Context,
1454 SS ? SS->getWithLocInContext(Context)
1455 : NestedNameSpecifierLoc(),
John McCall113bee02012-03-10 09:33:50 +00001456 SourceLocation(),
1457 D, refersToEnclosingScope,
1458 NameInfo, Ty, VK);
Mike Stump11289f42009-09-09 15:08:12 +00001459
Eli Friedmanfa0df832012-02-02 03:46:19 +00001460 MarkDeclRefReferenced(E);
John McCall086a4642010-11-24 05:12:34 +00001461
Jordan Rose657b5f42012-09-28 22:21:35 +00001462 if (getLangOpts().ObjCARCWeak && isa<VarDecl>(D) &&
1463 Ty.getObjCLifetime() == Qualifiers::OCL_Weak) {
1464 DiagnosticsEngine::Level Level =
1465 Diags.getDiagnosticLevel(diag::warn_arc_repeated_use_of_weak,
1466 E->getLocStart());
1467 if (Level != DiagnosticsEngine::Ignored)
1468 getCurFunction()->recordUseOfWeak(E);
1469 }
1470
John McCall086a4642010-11-24 05:12:34 +00001471 // Just in case we're building an illegal pointer-to-member.
Richard Smithcaf33902011-10-10 18:28:20 +00001472 FieldDecl *FD = dyn_cast<FieldDecl>(D);
1473 if (FD && FD->isBitField())
John McCall086a4642010-11-24 05:12:34 +00001474 E->setObjectKind(OK_BitField);
1475
1476 return Owned(E);
Douglas Gregorc7acfdf2009-01-06 05:10:23 +00001477}
1478
Abramo Bagnarad6d2f182010-08-11 22:01:17 +00001479/// Decomposes the given name into a DeclarationNameInfo, its location, and
John McCall10eae182009-11-30 22:42:35 +00001480/// possibly a list of template arguments.
1481///
1482/// If this produces template arguments, it is permitted to call
1483/// DecomposeTemplateName.
1484///
1485/// This actually loses a lot of source location information for
1486/// non-standard name kinds; we should consider preserving that in
1487/// some way.
Richard Trieucfc491d2011-08-02 04:35:43 +00001488void
1489Sema::DecomposeUnqualifiedId(const UnqualifiedId &Id,
1490 TemplateArgumentListInfo &Buffer,
1491 DeclarationNameInfo &NameInfo,
1492 const TemplateArgumentListInfo *&TemplateArgs) {
John McCall10eae182009-11-30 22:42:35 +00001493 if (Id.getKind() == UnqualifiedId::IK_TemplateId) {
1494 Buffer.setLAngleLoc(Id.TemplateId->LAngleLoc);
1495 Buffer.setRAngleLoc(Id.TemplateId->RAngleLoc);
1496
Benjamin Kramercc4c49d2012-08-23 23:38:35 +00001497 ASTTemplateArgsPtr TemplateArgsPtr(Id.TemplateId->getTemplateArgs(),
John McCall10eae182009-11-30 22:42:35 +00001498 Id.TemplateId->NumArgs);
Douglas Gregor5476205b2011-06-23 00:49:38 +00001499 translateTemplateArguments(TemplateArgsPtr, Buffer);
John McCall10eae182009-11-30 22:42:35 +00001500
John McCall3e56fd42010-08-23 07:28:44 +00001501 TemplateName TName = Id.TemplateId->Template.get();
Abramo Bagnarad6d2f182010-08-11 22:01:17 +00001502 SourceLocation TNameLoc = Id.TemplateId->TemplateNameLoc;
Douglas Gregor5476205b2011-06-23 00:49:38 +00001503 NameInfo = Context.getNameForTemplate(TName, TNameLoc);
John McCall10eae182009-11-30 22:42:35 +00001504 TemplateArgs = &Buffer;
1505 } else {
Douglas Gregor5476205b2011-06-23 00:49:38 +00001506 NameInfo = GetNameFromUnqualifiedId(Id);
John McCall10eae182009-11-30 22:42:35 +00001507 TemplateArgs = 0;
1508 }
1509}
1510
John McCalld681c392009-12-16 08:11:27 +00001511/// Diagnose an empty lookup.
1512///
1513/// \return false if new lookup candidates were found
Nick Lewyckyc96c37f2010-07-06 19:51:49 +00001514bool Sema::DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
Kaelyn Uhrain79d01c12012-01-18 05:58:54 +00001515 CorrectionCandidateCallback &CCC,
Kaelyn Uhrain42830922011-08-05 00:09:52 +00001516 TemplateArgumentListInfo *ExplicitTemplateArgs,
Ahmed Charlesb24b9aa2012-02-25 11:00:22 +00001517 llvm::ArrayRef<Expr *> Args) {
John McCalld681c392009-12-16 08:11:27 +00001518 DeclarationName Name = R.getLookupName();
1519
John McCalld681c392009-12-16 08:11:27 +00001520 unsigned diagnostic = diag::err_undeclared_var_use;
Douglas Gregor598b08f2009-12-31 05:20:13 +00001521 unsigned diagnostic_suggest = diag::err_undeclared_var_use_suggest;
John McCalld681c392009-12-16 08:11:27 +00001522 if (Name.getNameKind() == DeclarationName::CXXOperatorName ||
1523 Name.getNameKind() == DeclarationName::CXXLiteralOperatorName ||
Douglas Gregor598b08f2009-12-31 05:20:13 +00001524 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
John McCalld681c392009-12-16 08:11:27 +00001525 diagnostic = diag::err_undeclared_use;
Douglas Gregor598b08f2009-12-31 05:20:13 +00001526 diagnostic_suggest = diag::err_undeclared_use_suggest;
1527 }
John McCalld681c392009-12-16 08:11:27 +00001528
Douglas Gregor598b08f2009-12-31 05:20:13 +00001529 // If the original lookup was an unqualified lookup, fake an
1530 // unqualified lookup. This is useful when (for example) the
1531 // original lookup would not have found something because it was a
1532 // dependent name.
David Blaikiec4c0e8a2012-05-28 01:26:45 +00001533 DeclContext *DC = (SS.isEmpty() && !CallsUndergoingInstantiation.empty())
1534 ? CurContext : 0;
Francois Pichetde232cb2011-11-25 01:10:54 +00001535 while (DC) {
John McCalld681c392009-12-16 08:11:27 +00001536 if (isa<CXXRecordDecl>(DC)) {
1537 LookupQualifiedName(R, DC);
1538
1539 if (!R.empty()) {
1540 // Don't give errors about ambiguities in this lookup.
1541 R.suppressDiagnostics();
1542
Francois Pichet857f9d62011-11-17 03:44:24 +00001543 // During a default argument instantiation the CurContext points
1544 // to a CXXMethodDecl; but we can't apply a this-> fixit inside a
1545 // function parameter list, hence add an explicit check.
1546 bool isDefaultArgument = !ActiveTemplateInstantiations.empty() &&
1547 ActiveTemplateInstantiations.back().Kind ==
1548 ActiveTemplateInstantiation::DefaultFunctionArgumentInstantiation;
John McCalld681c392009-12-16 08:11:27 +00001549 CXXMethodDecl *CurMethod = dyn_cast<CXXMethodDecl>(CurContext);
1550 bool isInstance = CurMethod &&
1551 CurMethod->isInstance() &&
Francois Pichet857f9d62011-11-17 03:44:24 +00001552 DC == CurMethod->getParent() && !isDefaultArgument;
1553
John McCalld681c392009-12-16 08:11:27 +00001554
1555 // Give a code modification hint to insert 'this->'.
1556 // TODO: fixit for inserting 'Base<T>::' in the other cases.
1557 // Actually quite difficult!
Nico Weberdf7dffb2012-06-20 20:21:42 +00001558 if (getLangOpts().MicrosoftMode)
1559 diagnostic = diag::warn_found_via_dependent_bases_lookup;
Nick Lewyckyc96c37f2010-07-06 19:51:49 +00001560 if (isInstance) {
Nico Weber3c10fb12012-06-22 16:39:39 +00001561 Diag(R.getNameLoc(), diagnostic) << Name
1562 << FixItHint::CreateInsertion(R.getNameLoc(), "this->");
Nick Lewyckyc96c37f2010-07-06 19:51:49 +00001563 UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(
1564 CallsUndergoingInstantiation.back()->getCallee());
Nico Weber3c10fb12012-06-22 16:39:39 +00001565
1566
1567 CXXMethodDecl *DepMethod;
1568 if (CurMethod->getTemplatedKind() ==
1569 FunctionDecl::TK_FunctionTemplateSpecialization)
1570 DepMethod = cast<CXXMethodDecl>(CurMethod->getPrimaryTemplate()->
1571 getInstantiatedFromMemberTemplate()->getTemplatedDecl());
1572 else
1573 DepMethod = cast<CXXMethodDecl>(
1574 CurMethod->getInstantiatedFromMemberFunction());
1575 assert(DepMethod && "No template pattern found");
1576
1577 QualType DepThisType = DepMethod->getThisType(Context);
1578 CheckCXXThisCapture(R.getNameLoc());
1579 CXXThisExpr *DepThis = new (Context) CXXThisExpr(
1580 R.getNameLoc(), DepThisType, false);
1581 TemplateArgumentListInfo TList;
1582 if (ULE->hasExplicitTemplateArgs())
1583 ULE->copyTemplateArgumentsInto(TList);
1584
1585 CXXScopeSpec SS;
1586 SS.Adopt(ULE->getQualifierLoc());
1587 CXXDependentScopeMemberExpr *DepExpr =
1588 CXXDependentScopeMemberExpr::Create(
1589 Context, DepThis, DepThisType, true, SourceLocation(),
1590 SS.getWithLocInContext(Context),
1591 ULE->getTemplateKeywordLoc(), 0,
1592 R.getLookupNameInfo(),
1593 ULE->hasExplicitTemplateArgs() ? &TList : 0);
1594 CallsUndergoingInstantiation.back()->setCallee(DepExpr);
Nick Lewyckyc96c37f2010-07-06 19:51:49 +00001595 } else {
John McCalld681c392009-12-16 08:11:27 +00001596 Diag(R.getNameLoc(), diagnostic) << Name;
Nick Lewyckyc96c37f2010-07-06 19:51:49 +00001597 }
John McCalld681c392009-12-16 08:11:27 +00001598
1599 // Do we really want to note all of these?
1600 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
1601 Diag((*I)->getLocation(), diag::note_dependent_var_use);
1602
Francois Pichet857f9d62011-11-17 03:44:24 +00001603 // Return true if we are inside a default argument instantiation
1604 // and the found name refers to an instance member function, otherwise
1605 // the function calling DiagnoseEmptyLookup will try to create an
1606 // implicit member call and this is wrong for default argument.
1607 if (isDefaultArgument && ((*R.begin())->isCXXInstanceMember())) {
1608 Diag(R.getNameLoc(), diag::err_member_call_without_object);
1609 return true;
1610 }
1611
John McCalld681c392009-12-16 08:11:27 +00001612 // Tell the callee to try to recover.
1613 return false;
1614 }
Douglas Gregor86b8d9f2010-08-09 22:38:14 +00001615
1616 R.clear();
John McCalld681c392009-12-16 08:11:27 +00001617 }
Francois Pichetde232cb2011-11-25 01:10:54 +00001618
1619 // In Microsoft mode, if we are performing lookup from within a friend
1620 // function definition declared at class scope then we must set
1621 // DC to the lexical parent to be able to search into the parent
1622 // class.
David Blaikiebbafb8a2012-03-11 07:00:24 +00001623 if (getLangOpts().MicrosoftMode && isa<FunctionDecl>(DC) &&
Francois Pichetde232cb2011-11-25 01:10:54 +00001624 cast<FunctionDecl>(DC)->getFriendObjectKind() &&
1625 DC->getLexicalParent()->isRecord())
1626 DC = DC->getLexicalParent();
1627 else
1628 DC = DC->getParent();
John McCalld681c392009-12-16 08:11:27 +00001629 }
1630
Douglas Gregor598b08f2009-12-31 05:20:13 +00001631 // We didn't find anything, so try to correct for a typo.
Douglas Gregorc2fa1692011-06-28 16:20:02 +00001632 TypoCorrection Corrected;
1633 if (S && (Corrected = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(),
Kaelyn Uhrain4e8942c2012-01-31 23:49:25 +00001634 S, &SS, CCC))) {
David Blaikiebbafb8a2012-03-11 07:00:24 +00001635 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
1636 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts()));
Douglas Gregorc2fa1692011-06-28 16:20:02 +00001637 R.setLookupName(Corrected.getCorrection());
1638
Hans Wennborg38198de2011-07-12 08:45:31 +00001639 if (NamedDecl *ND = Corrected.getCorrectionDecl()) {
Kaelyn Uhrainacbdc572011-08-03 20:36:05 +00001640 if (Corrected.isOverloaded()) {
1641 OverloadCandidateSet OCS(R.getNameLoc());
1642 OverloadCandidateSet::iterator Best;
1643 for (TypoCorrection::decl_iterator CD = Corrected.begin(),
1644 CDEnd = Corrected.end();
1645 CD != CDEnd; ++CD) {
Kaelyn Uhrain62422202011-08-08 17:35:31 +00001646 if (FunctionTemplateDecl *FTD =
Kaelyn Uhrain42830922011-08-05 00:09:52 +00001647 dyn_cast<FunctionTemplateDecl>(*CD))
1648 AddTemplateOverloadCandidate(
1649 FTD, DeclAccessPair::make(FTD, AS_none), ExplicitTemplateArgs,
Ahmed Charlesb24b9aa2012-02-25 11:00:22 +00001650 Args, OCS);
Kaelyn Uhrain62422202011-08-08 17:35:31 +00001651 else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*CD))
1652 if (!ExplicitTemplateArgs || ExplicitTemplateArgs->size() == 0)
1653 AddOverloadCandidate(FD, DeclAccessPair::make(FD, AS_none),
Ahmed Charlesb24b9aa2012-02-25 11:00:22 +00001654 Args, OCS);
Kaelyn Uhrainacbdc572011-08-03 20:36:05 +00001655 }
1656 switch (OCS.BestViableFunction(*this, R.getNameLoc(), Best)) {
1657 case OR_Success:
1658 ND = Best->Function;
1659 break;
1660 default:
Kaelyn Uhrainea350182011-08-04 23:30:54 +00001661 break;
Kaelyn Uhrainacbdc572011-08-03 20:36:05 +00001662 }
1663 }
Douglas Gregorc2fa1692011-06-28 16:20:02 +00001664 R.addDecl(ND);
1665 if (isa<ValueDecl>(ND) || isa<FunctionTemplateDecl>(ND)) {
Douglas Gregor280e1ee2010-04-14 20:04:41 +00001666 if (SS.isEmpty())
Douglas Gregorc2fa1692011-06-28 16:20:02 +00001667 Diag(R.getNameLoc(), diagnostic_suggest) << Name << CorrectedQuotedStr
1668 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr);
Douglas Gregor280e1ee2010-04-14 20:04:41 +00001669 else
1670 Diag(R.getNameLoc(), diag::err_no_member_suggest)
Douglas Gregorc2fa1692011-06-28 16:20:02 +00001671 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
Douglas Gregor280e1ee2010-04-14 20:04:41 +00001672 << SS.getRange()
David Blaikie04ea41c2012-10-12 20:00:44 +00001673 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(),
1674 CorrectedStr);
Douglas Gregorc2fa1692011-06-28 16:20:02 +00001675 if (ND)
Douglas Gregor280e1ee2010-04-14 20:04:41 +00001676 Diag(ND->getLocation(), diag::note_previous_decl)
Douglas Gregorc2fa1692011-06-28 16:20:02 +00001677 << CorrectedQuotedStr;
Douglas Gregor280e1ee2010-04-14 20:04:41 +00001678
1679 // Tell the callee to try to recover.
1680 return false;
1681 }
Alexis Huntc46382e2010-04-28 23:02:27 +00001682
Douglas Gregorc2fa1692011-06-28 16:20:02 +00001683 if (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND)) {
Douglas Gregor280e1ee2010-04-14 20:04:41 +00001684 // FIXME: If we ended up with a typo for a type name or
1685 // Objective-C class name, we're in trouble because the parser
1686 // is in the wrong place to recover. Suggest the typo
1687 // correction, but don't make it a fix-it since we're not going
1688 // to recover well anyway.
1689 if (SS.isEmpty())
Richard Trieucfc491d2011-08-02 04:35:43 +00001690 Diag(R.getNameLoc(), diagnostic_suggest)
1691 << Name << CorrectedQuotedStr;
Douglas Gregor280e1ee2010-04-14 20:04:41 +00001692 else
1693 Diag(R.getNameLoc(), diag::err_no_member_suggest)
Douglas Gregorc2fa1692011-06-28 16:20:02 +00001694 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
Douglas Gregor280e1ee2010-04-14 20:04:41 +00001695 << SS.getRange();
1696
1697 // Don't try to recover; it won't work.
1698 return true;
1699 }
1700 } else {
Alexis Huntc46382e2010-04-28 23:02:27 +00001701 // FIXME: We found a keyword. Suggest it, but don't provide a fix-it
Douglas Gregor280e1ee2010-04-14 20:04:41 +00001702 // because we aren't able to recover.
Douglas Gregor25363982010-01-01 00:15:04 +00001703 if (SS.isEmpty())
Douglas Gregorc2fa1692011-06-28 16:20:02 +00001704 Diag(R.getNameLoc(), diagnostic_suggest) << Name << CorrectedQuotedStr;
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00001705 else
Douglas Gregor25363982010-01-01 00:15:04 +00001706 Diag(R.getNameLoc(), diag::err_no_member_suggest)
Douglas Gregorc2fa1692011-06-28 16:20:02 +00001707 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
Douglas Gregor280e1ee2010-04-14 20:04:41 +00001708 << SS.getRange();
Douglas Gregor25363982010-01-01 00:15:04 +00001709 return true;
1710 }
Douglas Gregor598b08f2009-12-31 05:20:13 +00001711 }
Douglas Gregorc2fa1692011-06-28 16:20:02 +00001712 R.clear();
Douglas Gregor598b08f2009-12-31 05:20:13 +00001713
1714 // Emit a special diagnostic for failed member lookups.
1715 // FIXME: computing the declaration context might fail here (?)
1716 if (!SS.isEmpty()) {
1717 Diag(R.getNameLoc(), diag::err_no_member)
1718 << Name << computeDeclContext(SS, false)
1719 << SS.getRange();
1720 return true;
1721 }
1722
John McCalld681c392009-12-16 08:11:27 +00001723 // Give up, we can't recover.
1724 Diag(R.getNameLoc(), diagnostic) << Name;
1725 return true;
1726}
1727
John McCalldadc5752010-08-24 06:29:42 +00001728ExprResult Sema::ActOnIdExpression(Scope *S,
John McCall24d18942010-08-24 22:52:39 +00001729 CXXScopeSpec &SS,
Abramo Bagnara7945c982012-01-27 09:46:47 +00001730 SourceLocation TemplateKWLoc,
John McCall24d18942010-08-24 22:52:39 +00001731 UnqualifiedId &Id,
1732 bool HasTrailingLParen,
Kaelyn Uhrain77e21fc2012-01-25 20:49:08 +00001733 bool IsAddressOfOperand,
1734 CorrectionCandidateCallback *CCC) {
Richard Trieuba63ce62011-09-09 01:45:06 +00001735 assert(!(IsAddressOfOperand && HasTrailingLParen) &&
John McCalle66edc12009-11-24 19:00:30 +00001736 "cannot be direct & operand and have a trailing lparen");
1737
1738 if (SS.isInvalid())
Douglas Gregored8f2882009-01-30 01:04:22 +00001739 return ExprError();
Douglas Gregor90a1a652009-03-19 17:26:29 +00001740
John McCall10eae182009-11-30 22:42:35 +00001741 TemplateArgumentListInfo TemplateArgsBuffer;
John McCalle66edc12009-11-24 19:00:30 +00001742
1743 // Decompose the UnqualifiedId into the following data.
Abramo Bagnarad6d2f182010-08-11 22:01:17 +00001744 DeclarationNameInfo NameInfo;
John McCalle66edc12009-11-24 19:00:30 +00001745 const TemplateArgumentListInfo *TemplateArgs;
Douglas Gregor5476205b2011-06-23 00:49:38 +00001746 DecomposeUnqualifiedId(Id, TemplateArgsBuffer, NameInfo, TemplateArgs);
Douglas Gregor90a1a652009-03-19 17:26:29 +00001747
Abramo Bagnarad6d2f182010-08-11 22:01:17 +00001748 DeclarationName Name = NameInfo.getName();
Douglas Gregor4ea80432008-11-18 15:03:34 +00001749 IdentifierInfo *II = Name.getAsIdentifierInfo();
Abramo Bagnarad6d2f182010-08-11 22:01:17 +00001750 SourceLocation NameLoc = NameInfo.getLoc();
John McCalld14a8642009-11-21 08:51:07 +00001751
John McCalle66edc12009-11-24 19:00:30 +00001752 // C++ [temp.dep.expr]p3:
1753 // An id-expression is type-dependent if it contains:
Douglas Gregorea0a0a92010-01-11 18:40:55 +00001754 // -- an identifier that was declared with a dependent type,
1755 // (note: handled after lookup)
1756 // -- a template-id that is dependent,
1757 // (note: handled in BuildTemplateIdExpr)
1758 // -- a conversion-function-id that specifies a dependent type,
John McCalle66edc12009-11-24 19:00:30 +00001759 // -- a nested-name-specifier that contains a class-name that
1760 // names a dependent type.
1761 // Determine whether this is a member of an unknown specialization;
1762 // we need to handle these differently.
Eli Friedman964dbda2010-08-06 23:41:47 +00001763 bool DependentID = false;
1764 if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName &&
1765 Name.getCXXNameType()->isDependentType()) {
1766 DependentID = true;
1767 } else if (SS.isSet()) {
Chris Lattnerebb5c6c2011-02-18 01:27:55 +00001768 if (DeclContext *DC = computeDeclContext(SS, false)) {
Eli Friedman964dbda2010-08-06 23:41:47 +00001769 if (RequireCompleteDeclContext(SS, DC))
1770 return ExprError();
Eli Friedman964dbda2010-08-06 23:41:47 +00001771 } else {
1772 DependentID = true;
1773 }
1774 }
1775
Chris Lattnerebb5c6c2011-02-18 01:27:55 +00001776 if (DependentID)
Abramo Bagnara7945c982012-01-27 09:46:47 +00001777 return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
1778 IsAddressOfOperand, TemplateArgs);
Chris Lattnerebb5c6c2011-02-18 01:27:55 +00001779
John McCalle66edc12009-11-24 19:00:30 +00001780 // Perform the required lookup.
Fariborz Jahanian7f4427f2011-07-12 17:16:56 +00001781 LookupResult R(*this, NameInfo,
1782 (Id.getKind() == UnqualifiedId::IK_ImplicitSelfParam)
1783 ? LookupObjCImplicitSelfParam : LookupOrdinaryName);
John McCalle66edc12009-11-24 19:00:30 +00001784 if (TemplateArgs) {
Douglas Gregor3e51e172010-05-20 20:58:56 +00001785 // Lookup the template name again to correctly establish the context in
1786 // which it was found. This is really unfortunate as we already did the
1787 // lookup to determine that it was a template name in the first place. If
1788 // this becomes a performance hit, we can work harder to preserve those
1789 // results until we get here but it's likely not worth it.
Douglas Gregor786123d2010-05-21 23:18:07 +00001790 bool MemberOfUnknownSpecialization;
1791 LookupTemplateName(R, S, SS, QualType(), /*EnteringContext=*/false,
1792 MemberOfUnknownSpecialization);
Douglas Gregora5226932011-02-04 13:35:07 +00001793
1794 if (MemberOfUnknownSpecialization ||
1795 (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation))
Abramo Bagnara7945c982012-01-27 09:46:47 +00001796 return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
1797 IsAddressOfOperand, TemplateArgs);
John McCalle66edc12009-11-24 19:00:30 +00001798 } else {
Benjamin Kramer46921442012-01-20 14:57:34 +00001799 bool IvarLookupFollowUp = II && !SS.isSet() && getCurMethodDecl();
Fariborz Jahanian6fada5b2010-01-12 23:58:59 +00001800 LookupParsedName(R, S, &SS, !IvarLookupFollowUp);
Mike Stump11289f42009-09-09 15:08:12 +00001801
Douglas Gregora5226932011-02-04 13:35:07 +00001802 // If the result might be in a dependent base class, this is a dependent
1803 // id-expression.
1804 if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)
Abramo Bagnara7945c982012-01-27 09:46:47 +00001805 return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
1806 IsAddressOfOperand, TemplateArgs);
1807
John McCalle66edc12009-11-24 19:00:30 +00001808 // If this reference is in an Objective-C method, then we need to do
1809 // some special Objective-C lookup, too.
Fariborz Jahanian6fada5b2010-01-12 23:58:59 +00001810 if (IvarLookupFollowUp) {
John McCalldadc5752010-08-24 06:29:42 +00001811 ExprResult E(LookupInObjCMethod(R, S, II, true));
John McCalle66edc12009-11-24 19:00:30 +00001812 if (E.isInvalid())
1813 return ExprError();
Mike Stump11289f42009-09-09 15:08:12 +00001814
Chris Lattnerebb5c6c2011-02-18 01:27:55 +00001815 if (Expr *Ex = E.takeAs<Expr>())
1816 return Owned(Ex);
Steve Naroffebf4cb42008-06-02 23:03:37 +00001817 }
Chris Lattner59a25942008-03-31 00:36:02 +00001818 }
Douglas Gregorf15f5d32009-02-16 19:28:42 +00001819
John McCalle66edc12009-11-24 19:00:30 +00001820 if (R.isAmbiguous())
1821 return ExprError();
1822
Douglas Gregor171c45a2009-02-18 21:56:37 +00001823 // Determine whether this name might be a candidate for
1824 // argument-dependent lookup.
John McCalle66edc12009-11-24 19:00:30 +00001825 bool ADL = UseArgumentDependentLookup(SS, R, HasTrailingLParen);
Douglas Gregor171c45a2009-02-18 21:56:37 +00001826
John McCalle66edc12009-11-24 19:00:30 +00001827 if (R.empty() && !ADL) {
Bill Wendling4073ed52007-02-13 01:51:42 +00001828 // Otherwise, this could be an implicitly declared function reference (legal
John McCalle66edc12009-11-24 19:00:30 +00001829 // in C90, extension in C99, forbidden in C++).
David Blaikiebbafb8a2012-03-11 07:00:24 +00001830 if (HasTrailingLParen && II && !getLangOpts().CPlusPlus) {
John McCalle66edc12009-11-24 19:00:30 +00001831 NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *II, S);
1832 if (D) R.addDecl(D);
1833 }
1834
1835 // If this name wasn't predeclared and if this is not a function
1836 // call, diagnose the problem.
1837 if (R.empty()) {
Francois Pichetd8e4e412011-09-24 10:38:05 +00001838
1839 // In Microsoft mode, if we are inside a template class member function
1840 // and we can't resolve an identifier then assume the identifier is type
1841 // dependent. The goal is to postpone name lookup to instantiation time
1842 // to be able to search into type dependent base classes.
David Blaikiebbafb8a2012-03-11 07:00:24 +00001843 if (getLangOpts().MicrosoftMode && CurContext->isDependentContext() &&
Francois Pichetd8e4e412011-09-24 10:38:05 +00001844 isa<CXXMethodDecl>(CurContext))
Abramo Bagnara7945c982012-01-27 09:46:47 +00001845 return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
1846 IsAddressOfOperand, TemplateArgs);
Francois Pichetd8e4e412011-09-24 10:38:05 +00001847
Kaelyn Uhrain79d01c12012-01-18 05:58:54 +00001848 CorrectionCandidateCallback DefaultValidator;
Kaelyn Uhrain77e21fc2012-01-25 20:49:08 +00001849 if (DiagnoseEmptyLookup(S, SS, R, CCC ? *CCC : DefaultValidator))
John McCalld681c392009-12-16 08:11:27 +00001850 return ExprError();
1851
1852 assert(!R.empty() &&
1853 "DiagnoseEmptyLookup returned false but added no results");
Douglas Gregor35b0bac2010-01-03 18:01:57 +00001854
1855 // If we found an Objective-C instance variable, let
1856 // LookupInObjCMethod build the appropriate expression to
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00001857 // reference the ivar.
Douglas Gregor35b0bac2010-01-03 18:01:57 +00001858 if (ObjCIvarDecl *Ivar = R.getAsSingle<ObjCIvarDecl>()) {
1859 R.clear();
John McCalldadc5752010-08-24 06:29:42 +00001860 ExprResult E(LookupInObjCMethod(R, S, Ivar->getIdentifier()));
Fariborz Jahanian44653702011-09-23 23:11:38 +00001861 // In a hopelessly buggy code, Objective-C instance variable
1862 // lookup fails and no expression will be built to reference it.
1863 if (!E.isInvalid() && !E.get())
1864 return ExprError();
Benjamin Kramer62b95d82012-08-23 21:35:17 +00001865 return E;
Douglas Gregor35b0bac2010-01-03 18:01:57 +00001866 }
Steve Naroff92e30f82007-04-02 22:35:25 +00001867 }
Chris Lattner17ed4872006-11-20 04:58:19 +00001868 }
Mike Stump11289f42009-09-09 15:08:12 +00001869
John McCalle66edc12009-11-24 19:00:30 +00001870 // This is guaranteed from this point on.
1871 assert(!R.empty() || ADL);
1872
John McCall2d74de92009-12-01 22:10:20 +00001873 // Check whether this might be a C++ implicit instance member access.
John McCall24d18942010-08-24 22:52:39 +00001874 // C++ [class.mfct.non-static]p3:
1875 // When an id-expression that is not part of a class member access
1876 // syntax and not used to form a pointer to member is used in the
1877 // body of a non-static member function of class X, if name lookup
1878 // resolves the name in the id-expression to a non-static non-type
1879 // member of some class C, the id-expression is transformed into a
1880 // class member access expression using (*this) as the
1881 // postfix-expression to the left of the . operator.
John McCall8d08b9b2010-08-27 09:08:28 +00001882 //
1883 // But we don't actually need to do this for '&' operands if R
1884 // resolved to a function or overloaded function set, because the
1885 // expression is ill-formed if it actually works out to be a
1886 // non-static member function:
1887 //
1888 // C++ [expr.ref]p4:
1889 // Otherwise, if E1.E2 refers to a non-static member function. . .
1890 // [t]he expression can be used only as the left-hand operand of a
1891 // member function call.
1892 //
1893 // There are other safeguards against such uses, but it's important
1894 // to get this right here so that we don't end up making a
1895 // spuriously dependent expression if we're inside a dependent
1896 // instance method.
John McCall57500772009-12-16 12:17:52 +00001897 if (!R.empty() && (*R.begin())->isCXXClassMember()) {
John McCall8d08b9b2010-08-27 09:08:28 +00001898 bool MightBeImplicitMember;
Richard Trieuba63ce62011-09-09 01:45:06 +00001899 if (!IsAddressOfOperand)
John McCall8d08b9b2010-08-27 09:08:28 +00001900 MightBeImplicitMember = true;
1901 else if (!SS.isEmpty())
1902 MightBeImplicitMember = false;
1903 else if (R.isOverloadedResult())
1904 MightBeImplicitMember = false;
Douglas Gregor1262b062010-08-30 16:00:47 +00001905 else if (R.isUnresolvableResult())
1906 MightBeImplicitMember = true;
John McCall8d08b9b2010-08-27 09:08:28 +00001907 else
Francois Pichet783dd6e2010-11-21 06:08:52 +00001908 MightBeImplicitMember = isa<FieldDecl>(R.getFoundDecl()) ||
1909 isa<IndirectFieldDecl>(R.getFoundDecl());
John McCall8d08b9b2010-08-27 09:08:28 +00001910
1911 if (MightBeImplicitMember)
Abramo Bagnara7945c982012-01-27 09:46:47 +00001912 return BuildPossibleImplicitMemberExpr(SS, TemplateKWLoc,
1913 R, TemplateArgs);
John McCallb53bbd42009-11-22 01:44:31 +00001914 }
1915
Abramo Bagnara65f7c3d2012-02-06 14:31:00 +00001916 if (TemplateArgs || TemplateKWLoc.isValid())
1917 return BuildTemplateIdExpr(SS, TemplateKWLoc, R, ADL, TemplateArgs);
John McCallb53bbd42009-11-22 01:44:31 +00001918
John McCalle66edc12009-11-24 19:00:30 +00001919 return BuildDeclarationNameExpr(SS, R, ADL);
1920}
1921
John McCall10eae182009-11-30 22:42:35 +00001922/// BuildQualifiedDeclarationNameExpr - Build a C++ qualified
1923/// declaration name, generally during template instantiation.
1924/// There's a large number of things which don't need to be done along
1925/// this path.
John McCalldadc5752010-08-24 06:29:42 +00001926ExprResult
Jeffrey Yasskinc76498d2010-04-08 16:38:48 +00001927Sema::BuildQualifiedDeclarationNameExpr(CXXScopeSpec &SS,
Richard Smithdb2630f2012-10-21 03:28:35 +00001928 const DeclarationNameInfo &NameInfo,
1929 bool IsAddressOfOperand) {
Richard Smith40c180d2012-10-23 19:56:01 +00001930 DeclContext *DC = computeDeclContext(SS, false);
1931 if (!DC)
Abramo Bagnara65f7c3d2012-02-06 14:31:00 +00001932 return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(),
1933 NameInfo, /*TemplateArgs=*/0);
John McCalle66edc12009-11-24 19:00:30 +00001934
John McCall0b66eb32010-05-01 00:40:08 +00001935 if (RequireCompleteDeclContext(SS, DC))
Douglas Gregora02bb342010-04-28 07:04:26 +00001936 return ExprError();
1937
Abramo Bagnarad6d2f182010-08-11 22:01:17 +00001938 LookupResult R(*this, NameInfo, LookupOrdinaryName);
John McCalle66edc12009-11-24 19:00:30 +00001939 LookupQualifiedName(R, DC);
1940
1941 if (R.isAmbiguous())
1942 return ExprError();
1943
Richard Smith40c180d2012-10-23 19:56:01 +00001944 if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)
1945 return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(),
1946 NameInfo, /*TemplateArgs=*/0);
1947
John McCalle66edc12009-11-24 19:00:30 +00001948 if (R.empty()) {
Abramo Bagnarad6d2f182010-08-11 22:01:17 +00001949 Diag(NameInfo.getLoc(), diag::err_no_member)
1950 << NameInfo.getName() << DC << SS.getRange();
John McCalle66edc12009-11-24 19:00:30 +00001951 return ExprError();
1952 }
1953
Richard Smithdb2630f2012-10-21 03:28:35 +00001954 // Defend against this resolving to an implicit member access. We usually
1955 // won't get here if this might be a legitimate a class member (we end up in
1956 // BuildMemberReferenceExpr instead), but this can be valid if we're forming
1957 // a pointer-to-member or in an unevaluated context in C++11.
1958 if (!R.empty() && (*R.begin())->isCXXClassMember() && !IsAddressOfOperand)
1959 return BuildPossibleImplicitMemberExpr(SS,
1960 /*TemplateKWLoc=*/SourceLocation(),
1961 R, /*TemplateArgs=*/0);
1962
1963 return BuildDeclarationNameExpr(SS, R, /* ADL */ false);
John McCalle66edc12009-11-24 19:00:30 +00001964}
1965
1966/// LookupInObjCMethod - The parser has read a name in, and Sema has
1967/// detected that we're currently inside an ObjC method. Perform some
1968/// additional lookup.
1969///
1970/// Ideally, most of this would be done by lookup, but there's
1971/// actually quite a lot of extra work involved.
1972///
1973/// Returns a null sentinel to indicate trivial success.
John McCalldadc5752010-08-24 06:29:42 +00001974ExprResult
John McCalle66edc12009-11-24 19:00:30 +00001975Sema::LookupInObjCMethod(LookupResult &Lookup, Scope *S,
Chris Lattnera36ec422010-04-11 08:28:14 +00001976 IdentifierInfo *II, bool AllowBuiltinCreation) {
John McCalle66edc12009-11-24 19:00:30 +00001977 SourceLocation Loc = Lookup.getNameLoc();
Chris Lattner87313662010-04-12 05:10:17 +00001978 ObjCMethodDecl *CurMethod = getCurMethodDecl();
Alexis Huntc46382e2010-04-28 23:02:27 +00001979
John McCalle66edc12009-11-24 19:00:30 +00001980 // There are two cases to handle here. 1) scoped lookup could have failed,
1981 // in which case we should look for an ivar. 2) scoped lookup could have
1982 // found a decl, but that decl is outside the current instance method (i.e.
1983 // a global variable). In these two cases, we do a lookup for an ivar with
1984 // this name, if the lookup sucedes, we replace it our current decl.
1985
1986 // If we're in a class method, we don't normally want to look for
1987 // ivars. But if we don't find anything else, and there's an
1988 // ivar, that's an error.
Chris Lattner87313662010-04-12 05:10:17 +00001989 bool IsClassMethod = CurMethod->isClassMethod();
John McCalle66edc12009-11-24 19:00:30 +00001990
1991 bool LookForIvars;
1992 if (Lookup.empty())
1993 LookForIvars = true;
1994 else if (IsClassMethod)
1995 LookForIvars = false;
1996 else
1997 LookForIvars = (Lookup.isSingleResult() &&
1998 Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod());
Fariborz Jahanian45878032010-02-09 19:31:38 +00001999 ObjCInterfaceDecl *IFace = 0;
John McCalle66edc12009-11-24 19:00:30 +00002000 if (LookForIvars) {
Chris Lattner87313662010-04-12 05:10:17 +00002001 IFace = CurMethod->getClassInterface();
John McCalle66edc12009-11-24 19:00:30 +00002002 ObjCInterfaceDecl *ClassDeclared;
Argyrios Kyrtzidis4e8b1362011-10-19 02:25:16 +00002003 ObjCIvarDecl *IV = 0;
2004 if (IFace && (IV = IFace->lookupInstanceVariable(II, ClassDeclared))) {
John McCalle66edc12009-11-24 19:00:30 +00002005 // Diagnose using an ivar in a class method.
2006 if (IsClassMethod)
2007 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method)
2008 << IV->getDeclName());
2009
2010 // If we're referencing an invalid decl, just return this as a silent
2011 // error node. The error diagnostic was already emitted on the decl.
2012 if (IV->isInvalidDecl())
2013 return ExprError();
2014
2015 // Check if referencing a field with __attribute__((deprecated)).
2016 if (DiagnoseUseOfDecl(IV, Loc))
2017 return ExprError();
2018
2019 // Diagnose the use of an ivar outside of the declaring class.
2020 if (IV->getAccessControl() == ObjCIvarDecl::Private &&
Fariborz Jahaniand6cb4a82012-03-07 00:58:41 +00002021 !declaresSameEntity(ClassDeclared, IFace) &&
David Blaikiebbafb8a2012-03-11 07:00:24 +00002022 !getLangOpts().DebuggerSupport)
John McCalle66edc12009-11-24 19:00:30 +00002023 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName();
2024
2025 // FIXME: This should use a new expr for a direct reference, don't
2026 // turn this into Self->ivar, just return a BareIVarExpr or something.
2027 IdentifierInfo &II = Context.Idents.get("self");
2028 UnqualifiedId SelfName;
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00002029 SelfName.setIdentifier(&II, SourceLocation());
Fariborz Jahanian7f4427f2011-07-12 17:16:56 +00002030 SelfName.setKind(UnqualifiedId::IK_ImplicitSelfParam);
John McCalle66edc12009-11-24 19:00:30 +00002031 CXXScopeSpec SelfScopeSpec;
Abramo Bagnara7945c982012-01-27 09:46:47 +00002032 SourceLocation TemplateKWLoc;
2033 ExprResult SelfExpr = ActOnIdExpression(S, SelfScopeSpec, TemplateKWLoc,
Douglas Gregora1ed39b2010-09-22 16:33:13 +00002034 SelfName, false, false);
2035 if (SelfExpr.isInvalid())
2036 return ExprError();
2037
John Wiegley01296292011-04-08 18:41:53 +00002038 SelfExpr = DefaultLvalueConversion(SelfExpr.take());
2039 if (SelfExpr.isInvalid())
2040 return ExprError();
John McCall27584242010-12-06 20:48:59 +00002041
Nick Lewycky45b50522013-02-02 00:25:55 +00002042 MarkAnyDeclReferenced(Loc, IV, true);
Fariborz Jahaniana5063a62012-08-08 16:41:04 +00002043
2044 ObjCMethodFamily MF = CurMethod->getMethodFamily();
2045 if (MF != OMF_init && MF != OMF_dealloc && MF != OMF_finalize)
2046 Diag(Loc, diag::warn_direct_ivar_access) << IV->getDeclName();
Jordan Rose657b5f42012-09-28 22:21:35 +00002047
2048 ObjCIvarRefExpr *Result = new (Context) ObjCIvarRefExpr(IV, IV->getType(),
2049 Loc,
2050 SelfExpr.take(),
2051 true, true);
2052
2053 if (getLangOpts().ObjCAutoRefCount) {
2054 if (IV->getType().getObjCLifetime() == Qualifiers::OCL_Weak) {
2055 DiagnosticsEngine::Level Level =
2056 Diags.getDiagnosticLevel(diag::warn_arc_repeated_use_of_weak, Loc);
2057 if (Level != DiagnosticsEngine::Ignored)
2058 getCurFunction()->recordUseOfWeak(Result);
2059 }
Fariborz Jahanian4a675082012-10-03 17:55:29 +00002060 if (CurContext->isClosure())
2061 Diag(Loc, diag::warn_implicitly_retains_self)
2062 << FixItHint::CreateInsertion(Loc, "self->");
Jordan Rose657b5f42012-09-28 22:21:35 +00002063 }
2064
2065 return Owned(Result);
John McCalle66edc12009-11-24 19:00:30 +00002066 }
Chris Lattner87313662010-04-12 05:10:17 +00002067 } else if (CurMethod->isInstanceMethod()) {
John McCalle66edc12009-11-24 19:00:30 +00002068 // We should warn if a local variable hides an ivar.
Fariborz Jahanian557fc9a2011-11-08 22:51:27 +00002069 if (ObjCInterfaceDecl *IFace = CurMethod->getClassInterface()) {
2070 ObjCInterfaceDecl *ClassDeclared;
2071 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
2072 if (IV->getAccessControl() != ObjCIvarDecl::Private ||
Douglas Gregor0b144e12011-12-15 00:29:59 +00002073 declaresSameEntity(IFace, ClassDeclared))
Fariborz Jahanian557fc9a2011-11-08 22:51:27 +00002074 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName();
2075 }
John McCalle66edc12009-11-24 19:00:30 +00002076 }
Fariborz Jahanian028b9e12011-12-20 22:21:08 +00002077 } else if (Lookup.isSingleResult() &&
2078 Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod()) {
2079 // If accessing a stand-alone ivar in a class method, this is an error.
2080 if (const ObjCIvarDecl *IV = dyn_cast<ObjCIvarDecl>(Lookup.getFoundDecl()))
2081 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method)
2082 << IV->getDeclName());
John McCalle66edc12009-11-24 19:00:30 +00002083 }
2084
Fariborz Jahanian6fada5b2010-01-12 23:58:59 +00002085 if (Lookup.empty() && II && AllowBuiltinCreation) {
2086 // FIXME. Consolidate this with similar code in LookupName.
2087 if (unsigned BuiltinID = II->getBuiltinID()) {
David Blaikiebbafb8a2012-03-11 07:00:24 +00002088 if (!(getLangOpts().CPlusPlus &&
Fariborz Jahanian6fada5b2010-01-12 23:58:59 +00002089 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))) {
2090 NamedDecl *D = LazilyCreateBuiltin((IdentifierInfo *)II, BuiltinID,
2091 S, Lookup.isForRedeclaration(),
2092 Lookup.getNameLoc());
2093 if (D) Lookup.addDecl(D);
2094 }
2095 }
2096 }
John McCalle66edc12009-11-24 19:00:30 +00002097 // Sentinel value saying that we didn't do anything special.
2098 return Owned((Expr*) 0);
Douglas Gregor3256d042009-06-30 15:47:41 +00002099}
John McCalld14a8642009-11-21 08:51:07 +00002100
John McCall16df1e52010-03-30 21:47:33 +00002101/// \brief Cast a base object to a member's actual type.
2102///
2103/// Logically this happens in three phases:
2104///
2105/// * First we cast from the base type to the naming class.
2106/// The naming class is the class into which we were looking
2107/// when we found the member; it's the qualifier type if a
2108/// qualifier was provided, and otherwise it's the base type.
2109///
2110/// * Next we cast from the naming class to the declaring class.
2111/// If the member we found was brought into a class's scope by
2112/// a using declaration, this is that class; otherwise it's
2113/// the class declaring the member.
2114///
2115/// * Finally we cast from the declaring class to the "true"
2116/// declaring class of the member. This conversion does not
2117/// obey access control.
John Wiegley01296292011-04-08 18:41:53 +00002118ExprResult
2119Sema::PerformObjectMemberConversion(Expr *From,
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002120 NestedNameSpecifier *Qualifier,
John McCall16df1e52010-03-30 21:47:33 +00002121 NamedDecl *FoundDecl,
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002122 NamedDecl *Member) {
2123 CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Member->getDeclContext());
2124 if (!RD)
John Wiegley01296292011-04-08 18:41:53 +00002125 return Owned(From);
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00002126
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002127 QualType DestRecordType;
2128 QualType DestType;
2129 QualType FromRecordType;
2130 QualType FromType = From->getType();
2131 bool PointerConversions = false;
2132 if (isa<FieldDecl>(Member)) {
2133 DestRecordType = Context.getCanonicalType(Context.getTypeDeclType(RD));
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00002134
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002135 if (FromType->getAs<PointerType>()) {
2136 DestType = Context.getPointerType(DestRecordType);
2137 FromRecordType = FromType->getPointeeType();
2138 PointerConversions = true;
2139 } else {
2140 DestType = DestRecordType;
2141 FromRecordType = FromType;
Fariborz Jahanianbb67b822009-07-29 18:40:24 +00002142 }
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002143 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) {
2144 if (Method->isStatic())
John Wiegley01296292011-04-08 18:41:53 +00002145 return Owned(From);
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00002146
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002147 DestType = Method->getThisType(Context);
2148 DestRecordType = DestType->getPointeeType();
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00002149
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002150 if (FromType->getAs<PointerType>()) {
2151 FromRecordType = FromType->getPointeeType();
2152 PointerConversions = true;
2153 } else {
2154 FromRecordType = FromType;
2155 DestType = DestRecordType;
2156 }
2157 } else {
2158 // No conversion necessary.
John Wiegley01296292011-04-08 18:41:53 +00002159 return Owned(From);
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002160 }
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00002161
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002162 if (DestType->isDependentType() || FromType->isDependentType())
John Wiegley01296292011-04-08 18:41:53 +00002163 return Owned(From);
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00002164
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002165 // If the unqualified types are the same, no conversion is necessary.
2166 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
John Wiegley01296292011-04-08 18:41:53 +00002167 return Owned(From);
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00002168
John McCall16df1e52010-03-30 21:47:33 +00002169 SourceRange FromRange = From->getSourceRange();
2170 SourceLocation FromLoc = FromRange.getBegin();
2171
Eli Friedmanbe4b3632011-09-27 21:58:52 +00002172 ExprValueKind VK = From->getValueKind();
Sebastian Redlc57d34b2010-07-20 04:20:21 +00002173
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002174 // C++ [class.member.lookup]p8:
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00002175 // [...] Ambiguities can often be resolved by qualifying a name with its
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002176 // class name.
2177 //
2178 // If the member was a qualified name and the qualified referred to a
2179 // specific base subobject type, we'll cast to that intermediate type
2180 // first and then to the object in which the member is declared. That allows
2181 // one to resolve ambiguities in, e.g., a diamond-shaped hierarchy such as:
2182 //
2183 // class Base { public: int x; };
2184 // class Derived1 : public Base { };
2185 // class Derived2 : public Base { };
2186 // class VeryDerived : public Derived1, public Derived2 { void f(); };
2187 //
2188 // void VeryDerived::f() {
2189 // x = 17; // error: ambiguous base subobjects
2190 // Derived1::x = 17; // okay, pick the Base subobject of Derived1
2191 // }
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002192 if (Qualifier) {
John McCall16df1e52010-03-30 21:47:33 +00002193 QualType QType = QualType(Qualifier->getAsType(), 0);
2194 assert(!QType.isNull() && "lookup done with dependent qualifier?");
2195 assert(QType->isRecordType() && "lookup done with non-record type");
2196
2197 QualType QRecordType = QualType(QType->getAs<RecordType>(), 0);
2198
2199 // In C++98, the qualifier type doesn't actually have to be a base
2200 // type of the object type, in which case we just ignore it.
2201 // Otherwise build the appropriate casts.
2202 if (IsDerivedFrom(FromRecordType, QRecordType)) {
John McCallcf142162010-08-07 06:22:56 +00002203 CXXCastPath BasePath;
John McCall16df1e52010-03-30 21:47:33 +00002204 if (CheckDerivedToBaseConversion(FromRecordType, QRecordType,
Anders Carlssonb78feca2010-04-24 19:22:20 +00002205 FromLoc, FromRange, &BasePath))
John Wiegley01296292011-04-08 18:41:53 +00002206 return ExprError();
John McCall16df1e52010-03-30 21:47:33 +00002207
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002208 if (PointerConversions)
John McCall16df1e52010-03-30 21:47:33 +00002209 QType = Context.getPointerType(QType);
John Wiegley01296292011-04-08 18:41:53 +00002210 From = ImpCastExprToType(From, QType, CK_UncheckedDerivedToBase,
2211 VK, &BasePath).take();
John McCall16df1e52010-03-30 21:47:33 +00002212
2213 FromType = QType;
2214 FromRecordType = QRecordType;
2215
2216 // If the qualifier type was the same as the destination type,
2217 // we're done.
2218 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
John Wiegley01296292011-04-08 18:41:53 +00002219 return Owned(From);
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002220 }
2221 }
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00002222
John McCall16df1e52010-03-30 21:47:33 +00002223 bool IgnoreAccess = false;
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002224
John McCall16df1e52010-03-30 21:47:33 +00002225 // If we actually found the member through a using declaration, cast
2226 // down to the using declaration's type.
2227 //
2228 // Pointer equality is fine here because only one declaration of a
2229 // class ever has member declarations.
2230 if (FoundDecl->getDeclContext() != Member->getDeclContext()) {
2231 assert(isa<UsingShadowDecl>(FoundDecl));
2232 QualType URecordType = Context.getTypeDeclType(
2233 cast<CXXRecordDecl>(FoundDecl->getDeclContext()));
2234
2235 // We only need to do this if the naming-class to declaring-class
2236 // conversion is non-trivial.
2237 if (!Context.hasSameUnqualifiedType(FromRecordType, URecordType)) {
2238 assert(IsDerivedFrom(FromRecordType, URecordType));
John McCallcf142162010-08-07 06:22:56 +00002239 CXXCastPath BasePath;
John McCall16df1e52010-03-30 21:47:33 +00002240 if (CheckDerivedToBaseConversion(FromRecordType, URecordType,
Anders Carlssonb78feca2010-04-24 19:22:20 +00002241 FromLoc, FromRange, &BasePath))
John Wiegley01296292011-04-08 18:41:53 +00002242 return ExprError();
Alexis Huntc46382e2010-04-28 23:02:27 +00002243
John McCall16df1e52010-03-30 21:47:33 +00002244 QualType UType = URecordType;
2245 if (PointerConversions)
2246 UType = Context.getPointerType(UType);
John Wiegley01296292011-04-08 18:41:53 +00002247 From = ImpCastExprToType(From, UType, CK_UncheckedDerivedToBase,
2248 VK, &BasePath).take();
John McCall16df1e52010-03-30 21:47:33 +00002249 FromType = UType;
2250 FromRecordType = URecordType;
2251 }
2252
2253 // We don't do access control for the conversion from the
2254 // declaring class to the true declaring class.
2255 IgnoreAccess = true;
Douglas Gregorcc3f3252010-03-03 23:55:11 +00002256 }
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00002257
John McCallcf142162010-08-07 06:22:56 +00002258 CXXCastPath BasePath;
Anders Carlssonb78feca2010-04-24 19:22:20 +00002259 if (CheckDerivedToBaseConversion(FromRecordType, DestRecordType,
2260 FromLoc, FromRange, &BasePath,
John McCall16df1e52010-03-30 21:47:33 +00002261 IgnoreAccess))
John Wiegley01296292011-04-08 18:41:53 +00002262 return ExprError();
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00002263
John Wiegley01296292011-04-08 18:41:53 +00002264 return ImpCastExprToType(From, DestType, CK_UncheckedDerivedToBase,
2265 VK, &BasePath);
Fariborz Jahanianbb67b822009-07-29 18:40:24 +00002266}
Douglas Gregor3256d042009-06-30 15:47:41 +00002267
John McCalle66edc12009-11-24 19:00:30 +00002268bool Sema::UseArgumentDependentLookup(const CXXScopeSpec &SS,
John McCallb53bbd42009-11-22 01:44:31 +00002269 const LookupResult &R,
2270 bool HasTrailingLParen) {
John McCalld14a8642009-11-21 08:51:07 +00002271 // Only when used directly as the postfix-expression of a call.
2272 if (!HasTrailingLParen)
2273 return false;
2274
2275 // Never if a scope specifier was provided.
John McCalle66edc12009-11-24 19:00:30 +00002276 if (SS.isSet())
John McCalld14a8642009-11-21 08:51:07 +00002277 return false;
2278
2279 // Only in C++ or ObjC++.
David Blaikiebbafb8a2012-03-11 07:00:24 +00002280 if (!getLangOpts().CPlusPlus)
John McCalld14a8642009-11-21 08:51:07 +00002281 return false;
2282
2283 // Turn off ADL when we find certain kinds of declarations during
2284 // normal lookup:
2285 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
2286 NamedDecl *D = *I;
2287
2288 // C++0x [basic.lookup.argdep]p3:
2289 // -- a declaration of a class member
2290 // Since using decls preserve this property, we check this on the
2291 // original decl.
John McCall57500772009-12-16 12:17:52 +00002292 if (D->isCXXClassMember())
John McCalld14a8642009-11-21 08:51:07 +00002293 return false;
2294
2295 // C++0x [basic.lookup.argdep]p3:
2296 // -- a block-scope function declaration that is not a
2297 // using-declaration
2298 // NOTE: we also trigger this for function templates (in fact, we
2299 // don't check the decl type at all, since all other decl types
2300 // turn off ADL anyway).
2301 if (isa<UsingShadowDecl>(D))
2302 D = cast<UsingShadowDecl>(D)->getTargetDecl();
2303 else if (D->getDeclContext()->isFunctionOrMethod())
2304 return false;
2305
2306 // C++0x [basic.lookup.argdep]p3:
2307 // -- a declaration that is neither a function or a function
2308 // template
2309 // And also for builtin functions.
2310 if (isa<FunctionDecl>(D)) {
2311 FunctionDecl *FDecl = cast<FunctionDecl>(D);
2312
2313 // But also builtin functions.
2314 if (FDecl->getBuiltinID() && FDecl->isImplicit())
2315 return false;
2316 } else if (!isa<FunctionTemplateDecl>(D))
2317 return false;
2318 }
2319
2320 return true;
2321}
2322
2323
John McCalld14a8642009-11-21 08:51:07 +00002324/// Diagnoses obvious problems with the use of the given declaration
2325/// as an expression. This is only actually called for lookups that
2326/// were not overloaded, and it doesn't promise that the declaration
2327/// will in fact be used.
2328static bool CheckDeclInExpr(Sema &S, SourceLocation Loc, NamedDecl *D) {
Richard Smithdda56e42011-04-15 14:24:37 +00002329 if (isa<TypedefNameDecl>(D)) {
John McCalld14a8642009-11-21 08:51:07 +00002330 S.Diag(Loc, diag::err_unexpected_typedef) << D->getDeclName();
2331 return true;
2332 }
2333
2334 if (isa<ObjCInterfaceDecl>(D)) {
2335 S.Diag(Loc, diag::err_unexpected_interface) << D->getDeclName();
2336 return true;
2337 }
2338
2339 if (isa<NamespaceDecl>(D)) {
2340 S.Diag(Loc, diag::err_unexpected_namespace) << D->getDeclName();
2341 return true;
2342 }
2343
2344 return false;
2345}
2346
John McCalldadc5752010-08-24 06:29:42 +00002347ExprResult
John McCalle66edc12009-11-24 19:00:30 +00002348Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
John McCallb53bbd42009-11-22 01:44:31 +00002349 LookupResult &R,
2350 bool NeedsADL) {
John McCall3a60c872009-12-08 22:45:53 +00002351 // If this is a single, fully-resolved result and we don't need ADL,
2352 // just build an ordinary singleton decl ref.
Douglas Gregor4b4844f2010-01-29 17:15:43 +00002353 if (!NeedsADL && R.isSingleResult() && !R.getAsSingle<FunctionTemplateDecl>())
Abramo Bagnarad6d2f182010-08-11 22:01:17 +00002354 return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(),
2355 R.getFoundDecl());
John McCalld14a8642009-11-21 08:51:07 +00002356
2357 // We only need to check the declaration if there's exactly one
2358 // result, because in the overloaded case the results can only be
2359 // functions and function templates.
John McCallb53bbd42009-11-22 01:44:31 +00002360 if (R.isSingleResult() &&
2361 CheckDeclInExpr(*this, R.getNameLoc(), R.getFoundDecl()))
John McCalld14a8642009-11-21 08:51:07 +00002362 return ExprError();
2363
John McCall58cc69d2010-01-27 01:50:18 +00002364 // Otherwise, just build an unresolved lookup expression. Suppress
2365 // any lookup-related diagnostics; we'll hash these out later, when
2366 // we've picked a target.
2367 R.suppressDiagnostics();
2368
John McCalld14a8642009-11-21 08:51:07 +00002369 UnresolvedLookupExpr *ULE
Douglas Gregora6e053e2010-12-15 01:34:56 +00002370 = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
Douglas Gregor0da1d432011-02-28 20:01:57 +00002371 SS.getWithLocInContext(Context),
2372 R.getLookupNameInfo(),
Douglas Gregor30a4f4c2010-05-23 18:57:34 +00002373 NeedsADL, R.isOverloadedResult(),
2374 R.begin(), R.end());
John McCalld14a8642009-11-21 08:51:07 +00002375
2376 return Owned(ULE);
2377}
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00002378
John McCalld14a8642009-11-21 08:51:07 +00002379/// \brief Complete semantic analysis for a reference to the given declaration.
John McCalldadc5752010-08-24 06:29:42 +00002380ExprResult
John McCalle66edc12009-11-24 19:00:30 +00002381Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
Abramo Bagnarad6d2f182010-08-11 22:01:17 +00002382 const DeclarationNameInfo &NameInfo,
2383 NamedDecl *D) {
John McCalld14a8642009-11-21 08:51:07 +00002384 assert(D && "Cannot refer to a NULL declaration");
John McCall283b9012009-11-22 00:44:51 +00002385 assert(!isa<FunctionTemplateDecl>(D) &&
2386 "Cannot refer unambiguously to a function template");
John McCalld14a8642009-11-21 08:51:07 +00002387
Abramo Bagnarad6d2f182010-08-11 22:01:17 +00002388 SourceLocation Loc = NameInfo.getLoc();
John McCalld14a8642009-11-21 08:51:07 +00002389 if (CheckDeclInExpr(*this, Loc, D))
2390 return ExprError();
Steve Narofff1e53692007-03-23 22:27:02 +00002391
Douglas Gregore7488b92009-12-01 16:58:18 +00002392 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) {
2393 // Specifically diagnose references to class templates that are missing
2394 // a template argument list.
2395 Diag(Loc, diag::err_template_decl_ref)
2396 << Template << SS.getRange();
2397 Diag(Template->getLocation(), diag::note_template_decl_here);
2398 return ExprError();
2399 }
2400
2401 // Make sure that we're referring to a value.
2402 ValueDecl *VD = dyn_cast<ValueDecl>(D);
2403 if (!VD) {
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00002404 Diag(Loc, diag::err_ref_non_value)
Douglas Gregore7488b92009-12-01 16:58:18 +00002405 << D << SS.getRange();
John McCallb48971d2009-12-18 18:35:10 +00002406 Diag(D->getLocation(), diag::note_declared_at);
Douglas Gregore7488b92009-12-01 16:58:18 +00002407 return ExprError();
2408 }
Sebastian Redlffbcf962009-01-18 18:53:16 +00002409
Douglas Gregor171c45a2009-02-18 21:56:37 +00002410 // Check whether this declaration can be used. Note that we suppress
2411 // this check when we're going to perform argument-dependent lookup
2412 // on this function name, because this might not be the function
2413 // that overload resolution actually selects.
John McCalld14a8642009-11-21 08:51:07 +00002414 if (DiagnoseUseOfDecl(VD, Loc))
Douglas Gregor171c45a2009-02-18 21:56:37 +00002415 return ExprError();
2416
Steve Naroff8de9c3a2008-09-05 22:11:13 +00002417 // Only create DeclRefExpr's for valid Decl's.
2418 if (VD->isInvalidDecl())
Sebastian Redlffbcf962009-01-18 18:53:16 +00002419 return ExprError();
2420
John McCallf3a88602011-02-03 08:15:49 +00002421 // Handle members of anonymous structs and unions. If we got here,
2422 // and the reference is to a class member indirect field, then this
2423 // must be the subject of a pointer-to-member expression.
2424 if (IndirectFieldDecl *indirectField = dyn_cast<IndirectFieldDecl>(VD))
2425 if (!indirectField->isCXXClassMember())
2426 return BuildAnonymousStructUnionMemberReference(SS, NameInfo.getLoc(),
2427 indirectField);
Francois Pichet783dd6e2010-11-21 06:08:52 +00002428
Eli Friedman9bb33f52012-02-03 02:04:35 +00002429 {
John McCallf4cd4f92011-02-09 01:13:10 +00002430 QualType type = VD->getType();
Daniel Dunbar7c2dc362011-02-10 18:29:28 +00002431 ExprValueKind valueKind = VK_RValue;
John McCallf4cd4f92011-02-09 01:13:10 +00002432
2433 switch (D->getKind()) {
2434 // Ignore all the non-ValueDecl kinds.
2435#define ABSTRACT_DECL(kind)
2436#define VALUE(type, base)
2437#define DECL(type, base) \
2438 case Decl::type:
2439#include "clang/AST/DeclNodes.inc"
2440 llvm_unreachable("invalid value decl kind");
John McCallf4cd4f92011-02-09 01:13:10 +00002441
2442 // These shouldn't make it here.
2443 case Decl::ObjCAtDefsField:
2444 case Decl::ObjCIvar:
2445 llvm_unreachable("forming non-member reference to ivar?");
John McCallf4cd4f92011-02-09 01:13:10 +00002446
2447 // Enum constants are always r-values and never references.
2448 // Unresolved using declarations are dependent.
2449 case Decl::EnumConstant:
2450 case Decl::UnresolvedUsingValue:
2451 valueKind = VK_RValue;
2452 break;
2453
2454 // Fields and indirect fields that got here must be for
2455 // pointer-to-member expressions; we just call them l-values for
2456 // internal consistency, because this subexpression doesn't really
2457 // exist in the high-level semantics.
2458 case Decl::Field:
2459 case Decl::IndirectField:
David Blaikiebbafb8a2012-03-11 07:00:24 +00002460 assert(getLangOpts().CPlusPlus &&
John McCallf4cd4f92011-02-09 01:13:10 +00002461 "building reference to field in C?");
2462
2463 // These can't have reference type in well-formed programs, but
2464 // for internal consistency we do this anyway.
2465 type = type.getNonReferenceType();
2466 valueKind = VK_LValue;
2467 break;
2468
2469 // Non-type template parameters are either l-values or r-values
2470 // depending on the type.
2471 case Decl::NonTypeTemplateParm: {
2472 if (const ReferenceType *reftype = type->getAs<ReferenceType>()) {
2473 type = reftype->getPointeeType();
2474 valueKind = VK_LValue; // even if the parameter is an r-value reference
2475 break;
2476 }
2477
2478 // For non-references, we need to strip qualifiers just in case
2479 // the template parameter was declared as 'const int' or whatever.
2480 valueKind = VK_RValue;
2481 type = type.getUnqualifiedType();
2482 break;
2483 }
2484
2485 case Decl::Var:
2486 // In C, "extern void blah;" is valid and is an r-value.
David Blaikiebbafb8a2012-03-11 07:00:24 +00002487 if (!getLangOpts().CPlusPlus &&
John McCallf4cd4f92011-02-09 01:13:10 +00002488 !type.hasQualifiers() &&
2489 type->isVoidType()) {
2490 valueKind = VK_RValue;
2491 break;
2492 }
2493 // fallthrough
2494
2495 case Decl::ImplicitParam:
Douglas Gregor812d8f62012-02-18 05:51:20 +00002496 case Decl::ParmVar: {
John McCallf4cd4f92011-02-09 01:13:10 +00002497 // These are always l-values.
2498 valueKind = VK_LValue;
2499 type = type.getNonReferenceType();
Eli Friedman9bb33f52012-02-03 02:04:35 +00002500
Douglas Gregor812d8f62012-02-18 05:51:20 +00002501 // FIXME: Does the addition of const really only apply in
2502 // potentially-evaluated contexts? Since the variable isn't actually
2503 // captured in an unevaluated context, it seems that the answer is no.
David Blaikie131fcb42012-08-06 22:47:24 +00002504 if (!isUnevaluatedContext()) {
Douglas Gregor812d8f62012-02-18 05:51:20 +00002505 QualType CapturedType = getCapturedDeclRefType(cast<VarDecl>(VD), Loc);
2506 if (!CapturedType.isNull())
2507 type = CapturedType;
2508 }
2509
John McCallf4cd4f92011-02-09 01:13:10 +00002510 break;
Douglas Gregor812d8f62012-02-18 05:51:20 +00002511 }
2512
John McCallf4cd4f92011-02-09 01:13:10 +00002513 case Decl::Function: {
Eli Friedman34866c72012-08-31 00:14:07 +00002514 if (unsigned BID = cast<FunctionDecl>(VD)->getBuiltinID()) {
2515 if (!Context.BuiltinInfo.isPredefinedLibFunction(BID)) {
2516 type = Context.BuiltinFnTy;
2517 valueKind = VK_RValue;
2518 break;
2519 }
2520 }
2521
John McCall2979fe02011-04-12 00:42:48 +00002522 const FunctionType *fty = type->castAs<FunctionType>();
2523
2524 // If we're referring to a function with an __unknown_anytype
2525 // result type, make the entire expression __unknown_anytype.
2526 if (fty->getResultType() == Context.UnknownAnyTy) {
2527 type = Context.UnknownAnyTy;
2528 valueKind = VK_RValue;
2529 break;
2530 }
2531
John McCallf4cd4f92011-02-09 01:13:10 +00002532 // Functions are l-values in C++.
David Blaikiebbafb8a2012-03-11 07:00:24 +00002533 if (getLangOpts().CPlusPlus) {
John McCallf4cd4f92011-02-09 01:13:10 +00002534 valueKind = VK_LValue;
2535 break;
2536 }
2537
2538 // C99 DR 316 says that, if a function type comes from a
2539 // function definition (without a prototype), that type is only
2540 // used for checking compatibility. Therefore, when referencing
2541 // the function, we pretend that we don't have the full function
2542 // type.
John McCall2979fe02011-04-12 00:42:48 +00002543 if (!cast<FunctionDecl>(VD)->hasPrototype() &&
2544 isa<FunctionProtoType>(fty))
2545 type = Context.getFunctionNoProtoType(fty->getResultType(),
2546 fty->getExtInfo());
John McCallf4cd4f92011-02-09 01:13:10 +00002547
2548 // Functions are r-values in C.
2549 valueKind = VK_RValue;
2550 break;
2551 }
2552
2553 case Decl::CXXMethod:
John McCall2979fe02011-04-12 00:42:48 +00002554 // If we're referring to a method with an __unknown_anytype
2555 // result type, make the entire expression __unknown_anytype.
2556 // This should only be possible with a type written directly.
Richard Trieucfc491d2011-08-02 04:35:43 +00002557 if (const FunctionProtoType *proto
2558 = dyn_cast<FunctionProtoType>(VD->getType()))
John McCall2979fe02011-04-12 00:42:48 +00002559 if (proto->getResultType() == Context.UnknownAnyTy) {
2560 type = Context.UnknownAnyTy;
2561 valueKind = VK_RValue;
2562 break;
2563 }
2564
John McCallf4cd4f92011-02-09 01:13:10 +00002565 // C++ methods are l-values if static, r-values if non-static.
2566 if (cast<CXXMethodDecl>(VD)->isStatic()) {
2567 valueKind = VK_LValue;
2568 break;
2569 }
2570 // fallthrough
2571
2572 case Decl::CXXConversion:
2573 case Decl::CXXDestructor:
2574 case Decl::CXXConstructor:
2575 valueKind = VK_RValue;
2576 break;
2577 }
2578
2579 return BuildDeclRefExpr(VD, type, valueKind, NameInfo, &SS);
2580 }
Chris Lattner17ed4872006-11-20 04:58:19 +00002581}
Chris Lattnere168f762006-11-10 05:29:30 +00002582
John McCall2979fe02011-04-12 00:42:48 +00002583ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind) {
Chris Lattner6307f192008-08-10 01:53:14 +00002584 PredefinedExpr::IdentType IT;
Sebastian Redlffbcf962009-01-18 18:53:16 +00002585
Chris Lattnere168f762006-11-10 05:29:30 +00002586 switch (Kind) {
David Blaikie83d382b2011-09-23 05:06:16 +00002587 default: llvm_unreachable("Unknown simple primary expr!");
Chris Lattner6307f192008-08-10 01:53:14 +00002588 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2]
2589 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break;
Nico Weber3a691a32012-06-23 02:07:59 +00002590 case tok::kw_L__FUNCTION__: IT = PredefinedExpr::LFunction; break;
Chris Lattner6307f192008-08-10 01:53:14 +00002591 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break;
Chris Lattnere168f762006-11-10 05:29:30 +00002592 }
Chris Lattner317e6ba2008-01-12 18:39:25 +00002593
Chris Lattnera81a0272008-01-12 08:14:25 +00002594 // Pre-defined identifiers are of type char[x], where x is the length of the
2595 // string.
Mike Stump11289f42009-09-09 15:08:12 +00002596
Anders Carlsson2fb08242009-09-08 18:24:21 +00002597 Decl *currentDecl = getCurFunctionOrMethodDecl();
Benjamin Kramer6928cf72012-12-06 15:42:21 +00002598 // Blocks and lambdas can occur at global scope. Don't emit a warning.
2599 if (!currentDecl) {
2600 if (const BlockScopeInfo *BSI = getCurBlock())
2601 currentDecl = BSI->TheDecl;
2602 else if (const LambdaScopeInfo *LSI = getCurLambda())
2603 currentDecl = LSI->CallOperator;
2604 }
2605
Anders Carlsson2fb08242009-09-08 18:24:21 +00002606 if (!currentDecl) {
Chris Lattnerf45c5ec2008-12-12 05:05:20 +00002607 Diag(Loc, diag::ext_predef_outside_function);
Anders Carlsson2fb08242009-09-08 18:24:21 +00002608 currentDecl = Context.getTranslationUnitDecl();
Chris Lattnerf45c5ec2008-12-12 05:05:20 +00002609 }
Sebastian Redlffbcf962009-01-18 18:53:16 +00002610
Anders Carlsson0b209a82009-09-11 01:22:35 +00002611 QualType ResTy;
2612 if (cast<DeclContext>(currentDecl)->isDependentContext()) {
2613 ResTy = Context.DependentTy;
2614 } else {
Anders Carlsson5bd8d192010-02-11 18:20:28 +00002615 unsigned Length = PredefinedExpr::ComputeName(IT, currentDecl).length();
Sebastian Redlffbcf962009-01-18 18:53:16 +00002616
Anders Carlsson0b209a82009-09-11 01:22:35 +00002617 llvm::APInt LengthI(32, Length + 1);
Nico Weber3052abd2012-06-29 16:39:58 +00002618 if (IT == PredefinedExpr::LFunction)
Nico Weber3a691a32012-06-23 02:07:59 +00002619 ResTy = Context.WCharTy.withConst();
2620 else
2621 ResTy = Context.CharTy.withConst();
Anders Carlsson0b209a82009-09-11 01:22:35 +00002622 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0);
2623 }
Steve Narofff6009ed2009-01-21 00:14:39 +00002624 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT));
Chris Lattnere168f762006-11-10 05:29:30 +00002625}
2626
Richard Smithbcc22fc2012-03-09 08:00:36 +00002627ExprResult Sema::ActOnCharacterConstant(const Token &Tok, Scope *UDLScope) {
Dylan Noblesmith2c1dd272012-02-05 02:13:05 +00002628 SmallString<16> CharBuffer;
Douglas Gregordc970f02010-03-16 22:30:13 +00002629 bool Invalid = false;
Chris Lattner0e62c1c2011-07-23 10:55:15 +00002630 StringRef ThisTok = PP.getSpelling(Tok, CharBuffer, &Invalid);
Douglas Gregordc970f02010-03-16 22:30:13 +00002631 if (Invalid)
2632 return ExprError();
Sebastian Redlffbcf962009-01-18 18:53:16 +00002633
Benjamin Kramer0a1abd42010-02-27 13:44:12 +00002634 CharLiteralParser Literal(ThisTok.begin(), ThisTok.end(), Tok.getLocation(),
Douglas Gregorfb65e592011-07-27 05:40:30 +00002635 PP, Tok.getKind());
Steve Naroffae4143e2007-04-26 20:39:23 +00002636 if (Literal.hadError())
Sebastian Redlffbcf962009-01-18 18:53:16 +00002637 return ExprError();
Chris Lattneref24b382008-03-01 08:32:21 +00002638
Chris Lattnerc3847ba2009-12-30 21:19:39 +00002639 QualType Ty;
Seth Cantrell02f86052012-01-18 12:27:06 +00002640 if (Literal.isWide())
2641 Ty = Context.WCharTy; // L'x' -> wchar_t in C and C++.
Douglas Gregorfb65e592011-07-27 05:40:30 +00002642 else if (Literal.isUTF16())
Seth Cantrell02f86052012-01-18 12:27:06 +00002643 Ty = Context.Char16Ty; // u'x' -> char16_t in C11 and C++11.
Douglas Gregorfb65e592011-07-27 05:40:30 +00002644 else if (Literal.isUTF32())
Seth Cantrell02f86052012-01-18 12:27:06 +00002645 Ty = Context.Char32Ty; // U'x' -> char32_t in C11 and C++11.
David Blaikiebbafb8a2012-03-11 07:00:24 +00002646 else if (!getLangOpts().CPlusPlus || Literal.isMultiChar())
Seth Cantrell02f86052012-01-18 12:27:06 +00002647 Ty = Context.IntTy; // 'x' -> int in C, 'wxyz' -> int in C++.
Chris Lattnerc3847ba2009-12-30 21:19:39 +00002648 else
2649 Ty = Context.CharTy; // 'x' -> char in C++
Chris Lattneref24b382008-03-01 08:32:21 +00002650
Douglas Gregorfb65e592011-07-27 05:40:30 +00002651 CharacterLiteral::CharacterKind Kind = CharacterLiteral::Ascii;
2652 if (Literal.isWide())
2653 Kind = CharacterLiteral::Wide;
2654 else if (Literal.isUTF16())
2655 Kind = CharacterLiteral::UTF16;
2656 else if (Literal.isUTF32())
2657 Kind = CharacterLiteral::UTF32;
2658
Richard Smith75b67d62012-03-08 01:34:56 +00002659 Expr *Lit = new (Context) CharacterLiteral(Literal.getValue(), Kind, Ty,
2660 Tok.getLocation());
2661
2662 if (Literal.getUDSuffix().empty())
2663 return Owned(Lit);
2664
2665 // We're building a user-defined literal.
2666 IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix());
2667 SourceLocation UDSuffixLoc =
2668 getUDSuffixLoc(*this, Tok.getLocation(), Literal.getUDSuffixOffset());
2669
Richard Smithbcc22fc2012-03-09 08:00:36 +00002670 // Make sure we're allowed user-defined literals here.
2671 if (!UDLScope)
2672 return ExprError(Diag(UDSuffixLoc, diag::err_invalid_character_udl));
2673
Richard Smith75b67d62012-03-08 01:34:56 +00002674 // C++11 [lex.ext]p6: The literal L is treated as a call of the form
2675 // operator "" X (ch)
Richard Smithbcc22fc2012-03-09 08:00:36 +00002676 return BuildCookedLiteralOperatorCall(*this, UDLScope, UDSuffix, UDSuffixLoc,
2677 llvm::makeArrayRef(&Lit, 1),
2678 Tok.getLocation());
Steve Naroffae4143e2007-04-26 20:39:23 +00002679}
2680
Ted Kremeneke65b0862012-03-06 20:05:56 +00002681ExprResult Sema::ActOnIntegerConstant(SourceLocation Loc, uint64_t Val) {
2682 unsigned IntSize = Context.getTargetInfo().getIntWidth();
2683 return Owned(IntegerLiteral::Create(Context, llvm::APInt(IntSize, Val),
2684 Context.IntTy, Loc));
2685}
2686
Richard Smith39570d002012-03-08 08:45:32 +00002687static Expr *BuildFloatingLiteral(Sema &S, NumericLiteralParser &Literal,
2688 QualType Ty, SourceLocation Loc) {
2689 const llvm::fltSemantics &Format = S.Context.getFloatTypeSemantics(Ty);
2690
2691 using llvm::APFloat;
2692 APFloat Val(Format);
2693
2694 APFloat::opStatus result = Literal.GetFloatValue(Val);
2695
2696 // Overflow is always an error, but underflow is only an error if
2697 // we underflowed to zero (APFloat reports denormals as underflow).
2698 if ((result & APFloat::opOverflow) ||
2699 ((result & APFloat::opUnderflow) && Val.isZero())) {
2700 unsigned diagnostic;
2701 SmallString<20> buffer;
2702 if (result & APFloat::opOverflow) {
2703 diagnostic = diag::warn_float_overflow;
2704 APFloat::getLargest(Format).toString(buffer);
2705 } else {
2706 diagnostic = diag::warn_float_underflow;
2707 APFloat::getSmallest(Format).toString(buffer);
2708 }
2709
2710 S.Diag(Loc, diagnostic)
2711 << Ty
2712 << StringRef(buffer.data(), buffer.size());
2713 }
2714
2715 bool isExact = (result == APFloat::opOK);
2716 return FloatingLiteral::Create(S.Context, Val, isExact, Ty, Loc);
2717}
2718
Richard Smithbcc22fc2012-03-09 08:00:36 +00002719ExprResult Sema::ActOnNumericConstant(const Token &Tok, Scope *UDLScope) {
Sebastian Redlffbcf962009-01-18 18:53:16 +00002720 // Fast path for a single digit (which is quite common). A single digit
Richard Smithbcc22fc2012-03-09 08:00:36 +00002721 // cannot have a trigraph, escaped newline, radix prefix, or suffix.
Steve Narofff2fb89e2007-03-13 20:29:44 +00002722 if (Tok.getLength() == 1) {
Chris Lattner9240b3e2009-01-26 22:36:52 +00002723 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok);
Ted Kremeneke65b0862012-03-06 20:05:56 +00002724 return ActOnIntegerConstant(Tok.getLocation(), Val-'0');
Steve Narofff2fb89e2007-03-13 20:29:44 +00002725 }
Ted Kremeneke9814182009-01-13 23:19:12 +00002726
Dmitri Gribenko7ba91722012-09-24 09:53:54 +00002727 SmallString<128> SpellingBuffer;
2728 // NumericLiteralParser wants to overread by one character. Add padding to
2729 // the buffer in case the token is copied to the buffer. If getSpelling()
2730 // returns a StringRef to the memory buffer, it should have a null char at
2731 // the EOF, so it is also safe.
2732 SpellingBuffer.resize(Tok.getLength() + 1);
Sebastian Redlffbcf962009-01-18 18:53:16 +00002733
Chris Lattner67ca9252007-05-21 01:08:44 +00002734 // Get the spelling of the token, which eliminates trigraphs, etc.
Douglas Gregordc970f02010-03-16 22:30:13 +00002735 bool Invalid = false;
Dmitri Gribenko7ba91722012-09-24 09:53:54 +00002736 StringRef TokSpelling = PP.getSpelling(Tok, SpellingBuffer, &Invalid);
Douglas Gregordc970f02010-03-16 22:30:13 +00002737 if (Invalid)
2738 return ExprError();
Sebastian Redlffbcf962009-01-18 18:53:16 +00002739
Dmitri Gribenko7ba91722012-09-24 09:53:54 +00002740 NumericLiteralParser Literal(TokSpelling, Tok.getLocation(), PP);
Steve Narofff2fb89e2007-03-13 20:29:44 +00002741 if (Literal.hadError)
Sebastian Redlffbcf962009-01-18 18:53:16 +00002742 return ExprError();
2743
Richard Smith39570d002012-03-08 08:45:32 +00002744 if (Literal.hasUDSuffix()) {
2745 // We're building a user-defined literal.
2746 IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix());
2747 SourceLocation UDSuffixLoc =
2748 getUDSuffixLoc(*this, Tok.getLocation(), Literal.getUDSuffixOffset());
2749
Richard Smithbcc22fc2012-03-09 08:00:36 +00002750 // Make sure we're allowed user-defined literals here.
2751 if (!UDLScope)
2752 return ExprError(Diag(UDSuffixLoc, diag::err_invalid_numeric_udl));
Richard Smith39570d002012-03-08 08:45:32 +00002753
Richard Smithbcc22fc2012-03-09 08:00:36 +00002754 QualType CookedTy;
Richard Smith39570d002012-03-08 08:45:32 +00002755 if (Literal.isFloatingLiteral()) {
2756 // C++11 [lex.ext]p4: If S contains a literal operator with parameter type
2757 // long double, the literal is treated as a call of the form
2758 // operator "" X (f L)
Richard Smithbcc22fc2012-03-09 08:00:36 +00002759 CookedTy = Context.LongDoubleTy;
Richard Smith39570d002012-03-08 08:45:32 +00002760 } else {
2761 // C++11 [lex.ext]p3: If S contains a literal operator with parameter type
2762 // unsigned long long, the literal is treated as a call of the form
2763 // operator "" X (n ULL)
Richard Smithbcc22fc2012-03-09 08:00:36 +00002764 CookedTy = Context.UnsignedLongLongTy;
Richard Smith39570d002012-03-08 08:45:32 +00002765 }
2766
Richard Smithbcc22fc2012-03-09 08:00:36 +00002767 DeclarationName OpName =
2768 Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix);
2769 DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc);
2770 OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc);
2771
2772 // Perform literal operator lookup to determine if we're building a raw
2773 // literal or a cooked one.
2774 LookupResult R(*this, OpName, UDSuffixLoc, LookupOrdinaryName);
2775 switch (LookupLiteralOperator(UDLScope, R, llvm::makeArrayRef(&CookedTy, 1),
2776 /*AllowRawAndTemplate*/true)) {
2777 case LOLR_Error:
2778 return ExprError();
2779
2780 case LOLR_Cooked: {
2781 Expr *Lit;
2782 if (Literal.isFloatingLiteral()) {
2783 Lit = BuildFloatingLiteral(*this, Literal, CookedTy, Tok.getLocation());
2784 } else {
2785 llvm::APInt ResultVal(Context.getTargetInfo().getLongLongWidth(), 0);
2786 if (Literal.GetIntegerValue(ResultVal))
2787 Diag(Tok.getLocation(), diag::warn_integer_too_large);
2788 Lit = IntegerLiteral::Create(Context, ResultVal, CookedTy,
2789 Tok.getLocation());
2790 }
2791 return BuildLiteralOperatorCall(R, OpNameInfo,
2792 llvm::makeArrayRef(&Lit, 1),
2793 Tok.getLocation());
2794 }
2795
2796 case LOLR_Raw: {
2797 // C++11 [lit.ext]p3, p4: If S contains a raw literal operator, the
2798 // literal is treated as a call of the form
2799 // operator "" X ("n")
2800 SourceLocation TokLoc = Tok.getLocation();
2801 unsigned Length = Literal.getUDSuffixOffset();
2802 QualType StrTy = Context.getConstantArrayType(
Richard Smithbe8229c2013-01-23 23:38:20 +00002803 Context.CharTy.withConst(), llvm::APInt(32, Length + 1),
Richard Smithbcc22fc2012-03-09 08:00:36 +00002804 ArrayType::Normal, 0);
2805 Expr *Lit = StringLiteral::Create(
Dmitri Gribenko7ba91722012-09-24 09:53:54 +00002806 Context, StringRef(TokSpelling.data(), Length), StringLiteral::Ascii,
Richard Smithbcc22fc2012-03-09 08:00:36 +00002807 /*Pascal*/false, StrTy, &TokLoc, 1);
2808 return BuildLiteralOperatorCall(R, OpNameInfo,
2809 llvm::makeArrayRef(&Lit, 1), TokLoc);
2810 }
2811
2812 case LOLR_Template:
2813 // C++11 [lit.ext]p3, p4: Otherwise (S contains a literal operator
2814 // template), L is treated as a call fo the form
2815 // operator "" X <'c1', 'c2', ... 'ck'>()
2816 // where n is the source character sequence c1 c2 ... ck.
2817 TemplateArgumentListInfo ExplicitArgs;
2818 unsigned CharBits = Context.getIntWidth(Context.CharTy);
2819 bool CharIsUnsigned = Context.CharTy->isUnsignedIntegerType();
2820 llvm::APSInt Value(CharBits, CharIsUnsigned);
2821 for (unsigned I = 0, N = Literal.getUDSuffixOffset(); I != N; ++I) {
Dmitri Gribenko7ba91722012-09-24 09:53:54 +00002822 Value = TokSpelling[I];
Benjamin Kramer6003ad52012-06-07 15:09:51 +00002823 TemplateArgument Arg(Context, Value, Context.CharTy);
Richard Smithbcc22fc2012-03-09 08:00:36 +00002824 TemplateArgumentLocInfo ArgInfo;
2825 ExplicitArgs.addArgument(TemplateArgumentLoc(Arg, ArgInfo));
2826 }
2827 return BuildLiteralOperatorCall(R, OpNameInfo, ArrayRef<Expr*>(),
2828 Tok.getLocation(), &ExplicitArgs);
2829 }
2830
2831 llvm_unreachable("unexpected literal operator lookup result");
Richard Smith39570d002012-03-08 08:45:32 +00002832 }
2833
Chris Lattner1c20a172007-08-26 03:42:43 +00002834 Expr *Res;
Sebastian Redlffbcf962009-01-18 18:53:16 +00002835
Chris Lattner1c20a172007-08-26 03:42:43 +00002836 if (Literal.isFloatingLiteral()) {
Chris Lattnerec0a6d92007-09-22 18:29:59 +00002837 QualType Ty;
Chris Lattner9a8d1d92008-06-30 18:32:54 +00002838 if (Literal.isFloat)
Chris Lattnerec0a6d92007-09-22 18:29:59 +00002839 Ty = Context.FloatTy;
Chris Lattner9a8d1d92008-06-30 18:32:54 +00002840 else if (!Literal.isLong)
Chris Lattnerec0a6d92007-09-22 18:29:59 +00002841 Ty = Context.DoubleTy;
Chris Lattner9a8d1d92008-06-30 18:32:54 +00002842 else
Chris Lattner7570e9c2008-03-08 08:52:55 +00002843 Ty = Context.LongDoubleTy;
Chris Lattner9a8d1d92008-06-30 18:32:54 +00002844
Richard Smith39570d002012-03-08 08:45:32 +00002845 Res = BuildFloatingLiteral(*this, Literal, Ty, Tok.getLocation());
Sebastian Redlffbcf962009-01-18 18:53:16 +00002846
Peter Collingbournec77f85b2011-03-11 19:24:59 +00002847 if (Ty == Context.DoubleTy) {
David Blaikiebbafb8a2012-03-11 07:00:24 +00002848 if (getLangOpts().SinglePrecisionConstants) {
John Wiegley01296292011-04-08 18:41:53 +00002849 Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).take();
David Blaikiebbafb8a2012-03-11 07:00:24 +00002850 } else if (getLangOpts().OpenCL && !getOpenCLOptions().cl_khr_fp64) {
Peter Collingbournec77f85b2011-03-11 19:24:59 +00002851 Diag(Tok.getLocation(), diag::warn_double_const_requires_fp64);
John Wiegley01296292011-04-08 18:41:53 +00002852 Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).take();
Peter Collingbournec77f85b2011-03-11 19:24:59 +00002853 }
2854 }
Chris Lattner1c20a172007-08-26 03:42:43 +00002855 } else if (!Literal.isIntegerLiteral()) {
Sebastian Redlffbcf962009-01-18 18:53:16 +00002856 return ExprError();
Chris Lattner1c20a172007-08-26 03:42:43 +00002857 } else {
Chris Lattner24d5bfe2008-04-02 04:24:33 +00002858 QualType Ty;
Chris Lattner67ca9252007-05-21 01:08:44 +00002859
Dmitri Gribenko1cd23052012-09-24 18:19:21 +00002860 // 'long long' is a C99 or C++11 feature.
2861 if (!getLangOpts().C99 && Literal.isLongLong) {
2862 if (getLangOpts().CPlusPlus)
2863 Diag(Tok.getLocation(),
Richard Smith2bf7fdb2013-01-02 11:42:31 +00002864 getLangOpts().CPlusPlus11 ?
Dmitri Gribenko1cd23052012-09-24 18:19:21 +00002865 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
2866 else
2867 Diag(Tok.getLocation(), diag::ext_c99_longlong);
2868 }
Neil Boothac582c52007-08-29 22:00:19 +00002869
Chris Lattner67ca9252007-05-21 01:08:44 +00002870 // Get the value in the widest-possible width.
Stephen Canonfdc6c1a2012-05-03 22:49:43 +00002871 unsigned MaxWidth = Context.getTargetInfo().getIntMaxTWidth();
2872 // The microsoft literal suffix extensions support 128-bit literals, which
2873 // may be wider than [u]intmax_t.
Richard Smithe6a56db2012-11-29 05:41:51 +00002874 // FIXME: Actually, they don't. We seem to have accidentally invented the
2875 // i128 suffix.
2876 if (Literal.isMicrosoftInteger && MaxWidth < 128 &&
2877 PP.getTargetInfo().hasInt128Type())
Stephen Canonfdc6c1a2012-05-03 22:49:43 +00002878 MaxWidth = 128;
2879 llvm::APInt ResultVal(MaxWidth, 0);
Sebastian Redlffbcf962009-01-18 18:53:16 +00002880
Chris Lattner67ca9252007-05-21 01:08:44 +00002881 if (Literal.GetIntegerValue(ResultVal)) {
2882 // If this value didn't fit into uintmax_t, warn and force to ull.
2883 Diag(Tok.getLocation(), diag::warn_integer_too_large);
Chris Lattner24d5bfe2008-04-02 04:24:33 +00002884 Ty = Context.UnsignedLongLongTy;
2885 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() &&
Chris Lattner37e05872008-03-05 18:54:05 +00002886 "long long is not intmax_t?");
Steve Naroff09ef4742007-03-09 23:16:33 +00002887 } else {
Chris Lattner67ca9252007-05-21 01:08:44 +00002888 // If this value fits into a ULL, try to figure out what else it fits into
2889 // according to the rules of C99 6.4.4.1p5.
Sebastian Redlffbcf962009-01-18 18:53:16 +00002890
Chris Lattner67ca9252007-05-21 01:08:44 +00002891 // Octal, Hexadecimal, and integers with a U suffix are allowed to
2892 // be an unsigned int.
2893 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10;
2894
2895 // Check from smallest to largest, picking the smallest type we can.
Chris Lattner55258cf2008-05-09 05:59:00 +00002896 unsigned Width = 0;
Chris Lattner7b939cf2007-08-23 21:58:08 +00002897 if (!Literal.isLong && !Literal.isLongLong) {
2898 // Are int/unsigned possibilities?
Douglas Gregore8bbc122011-09-02 00:18:52 +00002899 unsigned IntSize = Context.getTargetInfo().getIntWidth();
Sebastian Redlffbcf962009-01-18 18:53:16 +00002900
Chris Lattner67ca9252007-05-21 01:08:44 +00002901 // Does it fit in a unsigned int?
2902 if (ResultVal.isIntN(IntSize)) {
2903 // Does it fit in a signed int?
2904 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0)
Chris Lattner24d5bfe2008-04-02 04:24:33 +00002905 Ty = Context.IntTy;
Chris Lattner67ca9252007-05-21 01:08:44 +00002906 else if (AllowUnsigned)
Chris Lattner24d5bfe2008-04-02 04:24:33 +00002907 Ty = Context.UnsignedIntTy;
Chris Lattner55258cf2008-05-09 05:59:00 +00002908 Width = IntSize;
Chris Lattner67ca9252007-05-21 01:08:44 +00002909 }
Chris Lattner67ca9252007-05-21 01:08:44 +00002910 }
Sebastian Redlffbcf962009-01-18 18:53:16 +00002911
Chris Lattner67ca9252007-05-21 01:08:44 +00002912 // Are long/unsigned long possibilities?
Chris Lattner24d5bfe2008-04-02 04:24:33 +00002913 if (Ty.isNull() && !Literal.isLongLong) {
Douglas Gregore8bbc122011-09-02 00:18:52 +00002914 unsigned LongSize = Context.getTargetInfo().getLongWidth();
Sebastian Redlffbcf962009-01-18 18:53:16 +00002915
Chris Lattner67ca9252007-05-21 01:08:44 +00002916 // Does it fit in a unsigned long?
2917 if (ResultVal.isIntN(LongSize)) {
2918 // Does it fit in a signed long?
2919 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0)
Chris Lattner24d5bfe2008-04-02 04:24:33 +00002920 Ty = Context.LongTy;
Chris Lattner67ca9252007-05-21 01:08:44 +00002921 else if (AllowUnsigned)
Chris Lattner24d5bfe2008-04-02 04:24:33 +00002922 Ty = Context.UnsignedLongTy;
Chris Lattner55258cf2008-05-09 05:59:00 +00002923 Width = LongSize;
Chris Lattner67ca9252007-05-21 01:08:44 +00002924 }
Sebastian Redlffbcf962009-01-18 18:53:16 +00002925 }
2926
Stephen Canonfdc6c1a2012-05-03 22:49:43 +00002927 // Check long long if needed.
Chris Lattner24d5bfe2008-04-02 04:24:33 +00002928 if (Ty.isNull()) {
Douglas Gregore8bbc122011-09-02 00:18:52 +00002929 unsigned LongLongSize = Context.getTargetInfo().getLongLongWidth();
Sebastian Redlffbcf962009-01-18 18:53:16 +00002930
Chris Lattner67ca9252007-05-21 01:08:44 +00002931 // Does it fit in a unsigned long long?
2932 if (ResultVal.isIntN(LongLongSize)) {
2933 // Does it fit in a signed long long?
Francois Pichetc3e73b32011-01-11 23:38:13 +00002934 // To be compatible with MSVC, hex integer literals ending with the
2935 // LL or i64 suffix are always signed in Microsoft mode.
Francois Pichetbf711d92011-01-11 12:23:00 +00002936 if (!Literal.isUnsigned && (ResultVal[LongLongSize-1] == 0 ||
David Blaikiebbafb8a2012-03-11 07:00:24 +00002937 (getLangOpts().MicrosoftExt && Literal.isLongLong)))
Chris Lattner24d5bfe2008-04-02 04:24:33 +00002938 Ty = Context.LongLongTy;
Chris Lattner67ca9252007-05-21 01:08:44 +00002939 else if (AllowUnsigned)
Chris Lattner24d5bfe2008-04-02 04:24:33 +00002940 Ty = Context.UnsignedLongLongTy;
Chris Lattner55258cf2008-05-09 05:59:00 +00002941 Width = LongLongSize;
Chris Lattner67ca9252007-05-21 01:08:44 +00002942 }
2943 }
Stephen Canonfdc6c1a2012-05-03 22:49:43 +00002944
2945 // If it doesn't fit in unsigned long long, and we're using Microsoft
2946 // extensions, then its a 128-bit integer literal.
Richard Smithe6a56db2012-11-29 05:41:51 +00002947 if (Ty.isNull() && Literal.isMicrosoftInteger &&
2948 PP.getTargetInfo().hasInt128Type()) {
Stephen Canonfdc6c1a2012-05-03 22:49:43 +00002949 if (Literal.isUnsigned)
2950 Ty = Context.UnsignedInt128Ty;
2951 else
2952 Ty = Context.Int128Ty;
2953 Width = 128;
2954 }
Sebastian Redlffbcf962009-01-18 18:53:16 +00002955
Chris Lattner67ca9252007-05-21 01:08:44 +00002956 // If we still couldn't decide a type, we probably have something that
2957 // does not fit in a signed long long, but has no U suffix.
Chris Lattner24d5bfe2008-04-02 04:24:33 +00002958 if (Ty.isNull()) {
Chris Lattner67ca9252007-05-21 01:08:44 +00002959 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed);
Chris Lattner24d5bfe2008-04-02 04:24:33 +00002960 Ty = Context.UnsignedLongLongTy;
Douglas Gregore8bbc122011-09-02 00:18:52 +00002961 Width = Context.getTargetInfo().getLongLongWidth();
Chris Lattner67ca9252007-05-21 01:08:44 +00002962 }
Sebastian Redlffbcf962009-01-18 18:53:16 +00002963
Chris Lattner55258cf2008-05-09 05:59:00 +00002964 if (ResultVal.getBitWidth() != Width)
Jay Foad6d4db0c2010-12-07 08:25:34 +00002965 ResultVal = ResultVal.trunc(Width);
Steve Naroff09ef4742007-03-09 23:16:33 +00002966 }
Argyrios Kyrtzidis43b20572010-08-28 09:06:06 +00002967 Res = IntegerLiteral::Create(Context, ResultVal, Ty, Tok.getLocation());
Steve Naroff09ef4742007-03-09 23:16:33 +00002968 }
Sebastian Redlffbcf962009-01-18 18:53:16 +00002969
Chris Lattner1c20a172007-08-26 03:42:43 +00002970 // If this is an imaginary literal, create the ImaginaryLiteral wrapper.
2971 if (Literal.isImaginary)
Mike Stump11289f42009-09-09 15:08:12 +00002972 Res = new (Context) ImaginaryLiteral(Res,
Steve Narofff6009ed2009-01-21 00:14:39 +00002973 Context.getComplexType(Res->getType()));
Sebastian Redlffbcf962009-01-18 18:53:16 +00002974
2975 return Owned(Res);
Chris Lattnere168f762006-11-10 05:29:30 +00002976}
2977
Richard Trieuba63ce62011-09-09 01:45:06 +00002978ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, Expr *E) {
Chris Lattner24d5bfe2008-04-02 04:24:33 +00002979 assert((E != 0) && "ActOnParenExpr() missing expr");
Steve Narofff6009ed2009-01-21 00:14:39 +00002980 return Owned(new (Context) ParenExpr(L, R, E));
Chris Lattnere168f762006-11-10 05:29:30 +00002981}
2982
Chandler Carruth62da79c2011-05-26 08:53:12 +00002983static bool CheckVecStepTraitOperandType(Sema &S, QualType T,
2984 SourceLocation Loc,
2985 SourceRange ArgRange) {
2986 // [OpenCL 1.1 6.11.12] "The vec_step built-in function takes a built-in
2987 // scalar or vector data type argument..."
2988 // Every built-in scalar type (OpenCL 1.1 6.1.1) is either an arithmetic
2989 // type (C99 6.2.5p18) or void.
2990 if (!(T->isArithmeticType() || T->isVoidType() || T->isVectorType())) {
2991 S.Diag(Loc, diag::err_vecstep_non_scalar_vector_type)
2992 << T << ArgRange;
2993 return true;
2994 }
2995
2996 assert((T->isVoidType() || !T->isIncompleteType()) &&
2997 "Scalar types should always be complete");
2998 return false;
2999}
3000
Chandler Carruthcea1aac2011-05-26 08:53:16 +00003001static bool CheckExtensionTraitOperandType(Sema &S, QualType T,
3002 SourceLocation Loc,
3003 SourceRange ArgRange,
3004 UnaryExprOrTypeTrait TraitKind) {
3005 // C99 6.5.3.4p1:
3006 if (T->isFunctionType()) {
3007 // alignof(function) is allowed as an extension.
3008 if (TraitKind == UETT_SizeOf)
3009 S.Diag(Loc, diag::ext_sizeof_function_type) << ArgRange;
3010 return false;
3011 }
3012
3013 // Allow sizeof(void)/alignof(void) as an extension.
3014 if (T->isVoidType()) {
3015 S.Diag(Loc, diag::ext_sizeof_void_type) << TraitKind << ArgRange;
3016 return false;
3017 }
3018
3019 return true;
3020}
3021
3022static bool CheckObjCTraitOperandConstraints(Sema &S, QualType T,
3023 SourceLocation Loc,
3024 SourceRange ArgRange,
3025 UnaryExprOrTypeTrait TraitKind) {
John McCallf2538342012-07-31 05:14:30 +00003026 // Reject sizeof(interface) and sizeof(interface<proto>) if the
3027 // runtime doesn't allow it.
3028 if (!S.LangOpts.ObjCRuntime.allowsSizeofAlignof() && T->isObjCObjectType()) {
Chandler Carruthcea1aac2011-05-26 08:53:16 +00003029 S.Diag(Loc, diag::err_sizeof_nonfragile_interface)
3030 << T << (TraitKind == UETT_SizeOf)
3031 << ArgRange;
3032 return true;
3033 }
3034
3035 return false;
3036}
3037
Chandler Carruth14502c22011-05-26 08:53:10 +00003038/// \brief Check the constrains on expression operands to unary type expression
3039/// and type traits.
3040///
Chandler Carruth7c430c02011-05-27 01:33:31 +00003041/// Completes any types necessary and validates the constraints on the operand
3042/// expression. The logic mostly mirrors the type-based overload, but may modify
3043/// the expression as it completes the type for that expression through template
3044/// instantiation, etc.
Richard Trieuba63ce62011-09-09 01:45:06 +00003045bool Sema::CheckUnaryExprOrTypeTraitOperand(Expr *E,
Chandler Carruth14502c22011-05-26 08:53:10 +00003046 UnaryExprOrTypeTrait ExprKind) {
Richard Trieuba63ce62011-09-09 01:45:06 +00003047 QualType ExprTy = E->getType();
Chandler Carruth7c430c02011-05-27 01:33:31 +00003048
3049 // C++ [expr.sizeof]p2: "When applied to a reference or a reference type,
3050 // the result is the size of the referenced type."
3051 // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the
3052 // result shall be the alignment of the referenced type."
3053 if (const ReferenceType *Ref = ExprTy->getAs<ReferenceType>())
3054 ExprTy = Ref->getPointeeType();
3055
3056 if (ExprKind == UETT_VecStep)
Richard Trieuba63ce62011-09-09 01:45:06 +00003057 return CheckVecStepTraitOperandType(*this, ExprTy, E->getExprLoc(),
3058 E->getSourceRange());
Chandler Carruth7c430c02011-05-27 01:33:31 +00003059
3060 // Whitelist some types as extensions
Richard Trieuba63ce62011-09-09 01:45:06 +00003061 if (!CheckExtensionTraitOperandType(*this, ExprTy, E->getExprLoc(),
3062 E->getSourceRange(), ExprKind))
Chandler Carruth7c430c02011-05-27 01:33:31 +00003063 return false;
3064
Richard Trieuba63ce62011-09-09 01:45:06 +00003065 if (RequireCompleteExprType(E,
Douglas Gregor7bfb2d02012-05-04 16:32:21 +00003066 diag::err_sizeof_alignof_incomplete_type,
3067 ExprKind, E->getSourceRange()))
Chandler Carruth7c430c02011-05-27 01:33:31 +00003068 return true;
3069
3070 // Completeing the expression's type may have changed it.
Richard Trieuba63ce62011-09-09 01:45:06 +00003071 ExprTy = E->getType();
Chandler Carruth7c430c02011-05-27 01:33:31 +00003072 if (const ReferenceType *Ref = ExprTy->getAs<ReferenceType>())
3073 ExprTy = Ref->getPointeeType();
3074
Richard Trieuba63ce62011-09-09 01:45:06 +00003075 if (CheckObjCTraitOperandConstraints(*this, ExprTy, E->getExprLoc(),
3076 E->getSourceRange(), ExprKind))
Chandler Carruth7c430c02011-05-27 01:33:31 +00003077 return true;
3078
Nico Weber0870deb2011-06-15 02:47:03 +00003079 if (ExprKind == UETT_SizeOf) {
Richard Trieuba63ce62011-09-09 01:45:06 +00003080 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
Nico Weber0870deb2011-06-15 02:47:03 +00003081 if (ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(DeclRef->getFoundDecl())) {
3082 QualType OType = PVD->getOriginalType();
3083 QualType Type = PVD->getType();
3084 if (Type->isPointerType() && OType->isArrayType()) {
Richard Trieuba63ce62011-09-09 01:45:06 +00003085 Diag(E->getExprLoc(), diag::warn_sizeof_array_param)
Nico Weber0870deb2011-06-15 02:47:03 +00003086 << Type << OType;
3087 Diag(PVD->getLocation(), diag::note_declared_at);
3088 }
3089 }
3090 }
3091 }
3092
Chandler Carruth7c430c02011-05-27 01:33:31 +00003093 return false;
Chandler Carruth14502c22011-05-26 08:53:10 +00003094}
3095
3096/// \brief Check the constraints on operands to unary expression and type
3097/// traits.
3098///
3099/// This will complete any types necessary, and validate the various constraints
3100/// on those operands.
3101///
Steve Naroff71b59a92007-06-04 22:22:31 +00003102/// The UsualUnaryConversions() function is *not* called by this routine.
Chandler Carruth14502c22011-05-26 08:53:10 +00003103/// C99 6.3.2.1p[2-4] all state:
3104/// Except when it is the operand of the sizeof operator ...
3105///
3106/// C++ [expr.sizeof]p4
3107/// The lvalue-to-rvalue, array-to-pointer, and function-to-pointer
3108/// standard conversions are not applied to the operand of sizeof.
3109///
3110/// This policy is followed for all of the unary trait expressions.
Richard Trieuba63ce62011-09-09 01:45:06 +00003111bool Sema::CheckUnaryExprOrTypeTraitOperand(QualType ExprType,
Peter Collingbournee190dee2011-03-11 19:24:49 +00003112 SourceLocation OpLoc,
3113 SourceRange ExprRange,
3114 UnaryExprOrTypeTrait ExprKind) {
Richard Trieuba63ce62011-09-09 01:45:06 +00003115 if (ExprType->isDependentType())
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00003116 return false;
3117
Sebastian Redl22e2e5c2009-11-23 17:18:46 +00003118 // C++ [expr.sizeof]p2: "When applied to a reference or a reference type,
3119 // the result is the size of the referenced type."
3120 // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the
3121 // result shall be the alignment of the referenced type."
Richard Trieuba63ce62011-09-09 01:45:06 +00003122 if (const ReferenceType *Ref = ExprType->getAs<ReferenceType>())
3123 ExprType = Ref->getPointeeType();
Sebastian Redl22e2e5c2009-11-23 17:18:46 +00003124
Chandler Carruth62da79c2011-05-26 08:53:12 +00003125 if (ExprKind == UETT_VecStep)
Richard Trieuba63ce62011-09-09 01:45:06 +00003126 return CheckVecStepTraitOperandType(*this, ExprType, OpLoc, ExprRange);
Peter Collingbournee190dee2011-03-11 19:24:49 +00003127
Chandler Carruthcea1aac2011-05-26 08:53:16 +00003128 // Whitelist some types as extensions
Richard Trieuba63ce62011-09-09 01:45:06 +00003129 if (!CheckExtensionTraitOperandType(*this, ExprType, OpLoc, ExprRange,
Chandler Carruthcea1aac2011-05-26 08:53:16 +00003130 ExprKind))
Chris Lattnerb1355b12009-01-24 19:46:37 +00003131 return false;
Mike Stump11289f42009-09-09 15:08:12 +00003132
Richard Trieuba63ce62011-09-09 01:45:06 +00003133 if (RequireCompleteType(OpLoc, ExprType,
Douglas Gregor7bfb2d02012-05-04 16:32:21 +00003134 diag::err_sizeof_alignof_incomplete_type,
3135 ExprKind, ExprRange))
Chris Lattner62975a72009-04-24 00:30:45 +00003136 return true;
Mike Stump11289f42009-09-09 15:08:12 +00003137
Richard Trieuba63ce62011-09-09 01:45:06 +00003138 if (CheckObjCTraitOperandConstraints(*this, ExprType, OpLoc, ExprRange,
Chandler Carruthcea1aac2011-05-26 08:53:16 +00003139 ExprKind))
Chris Lattnercd2a8c52009-04-24 22:30:50 +00003140 return true;
Mike Stump11289f42009-09-09 15:08:12 +00003141
Chris Lattner62975a72009-04-24 00:30:45 +00003142 return false;
Steve Naroff043d45d2007-05-15 02:32:35 +00003143}
3144
Chandler Carruth14502c22011-05-26 08:53:10 +00003145static bool CheckAlignOfExpr(Sema &S, Expr *E) {
Chris Lattner8dff0172009-01-24 20:17:12 +00003146 E = E->IgnoreParens();
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00003147
Mike Stump11289f42009-09-09 15:08:12 +00003148 // alignof decl is always ok.
Chris Lattner8dff0172009-01-24 20:17:12 +00003149 if (isa<DeclRefExpr>(E))
3150 return false;
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00003151
3152 // Cannot know anything else if the expression is dependent.
3153 if (E->isTypeDependent())
3154 return false;
3155
Douglas Gregor71235ec2009-05-02 02:18:30 +00003156 if (E->getBitField()) {
Chandler Carruth14502c22011-05-26 08:53:10 +00003157 S.Diag(E->getExprLoc(), diag::err_sizeof_alignof_bitfield)
3158 << 1 << E->getSourceRange();
Douglas Gregor71235ec2009-05-02 02:18:30 +00003159 return true;
Chris Lattner8dff0172009-01-24 20:17:12 +00003160 }
Douglas Gregor71235ec2009-05-02 02:18:30 +00003161
3162 // Alignment of a field access is always okay, so long as it isn't a
3163 // bit-field.
3164 if (MemberExpr *ME = dyn_cast<MemberExpr>(E))
Mike Stump212005c2009-07-22 18:58:19 +00003165 if (isa<FieldDecl>(ME->getMemberDecl()))
Douglas Gregor71235ec2009-05-02 02:18:30 +00003166 return false;
3167
Chandler Carruth14502c22011-05-26 08:53:10 +00003168 return S.CheckUnaryExprOrTypeTraitOperand(E, UETT_AlignOf);
Peter Collingbournee190dee2011-03-11 19:24:49 +00003169}
3170
Chandler Carruth14502c22011-05-26 08:53:10 +00003171bool Sema::CheckVecStepExpr(Expr *E) {
Peter Collingbournee190dee2011-03-11 19:24:49 +00003172 E = E->IgnoreParens();
3173
3174 // Cannot know anything else if the expression is dependent.
3175 if (E->isTypeDependent())
3176 return false;
3177
Chandler Carruth14502c22011-05-26 08:53:10 +00003178 return CheckUnaryExprOrTypeTraitOperand(E, UETT_VecStep);
Chris Lattner8dff0172009-01-24 20:17:12 +00003179}
3180
Douglas Gregor0950e412009-03-13 21:01:28 +00003181/// \brief Build a sizeof or alignof expression given a type operand.
John McCalldadc5752010-08-24 06:29:42 +00003182ExprResult
Peter Collingbournee190dee2011-03-11 19:24:49 +00003183Sema::CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
3184 SourceLocation OpLoc,
3185 UnaryExprOrTypeTrait ExprKind,
3186 SourceRange R) {
John McCallbcd03502009-12-07 02:54:59 +00003187 if (!TInfo)
Douglas Gregor0950e412009-03-13 21:01:28 +00003188 return ExprError();
3189
John McCallbcd03502009-12-07 02:54:59 +00003190 QualType T = TInfo->getType();
John McCall4c98fd82009-11-04 07:28:41 +00003191
Douglas Gregor0950e412009-03-13 21:01:28 +00003192 if (!T->isDependentType() &&
Peter Collingbournee190dee2011-03-11 19:24:49 +00003193 CheckUnaryExprOrTypeTraitOperand(T, OpLoc, R, ExprKind))
Douglas Gregor0950e412009-03-13 21:01:28 +00003194 return ExprError();
3195
3196 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
Peter Collingbournee190dee2011-03-11 19:24:49 +00003197 return Owned(new (Context) UnaryExprOrTypeTraitExpr(ExprKind, TInfo,
3198 Context.getSizeType(),
3199 OpLoc, R.getEnd()));
Douglas Gregor0950e412009-03-13 21:01:28 +00003200}
3201
3202/// \brief Build a sizeof or alignof expression given an expression
3203/// operand.
John McCalldadc5752010-08-24 06:29:42 +00003204ExprResult
Chandler Carrutha923fb22011-05-29 07:32:14 +00003205Sema::CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
3206 UnaryExprOrTypeTrait ExprKind) {
Douglas Gregor835af982011-06-22 23:21:00 +00003207 ExprResult PE = CheckPlaceholderExpr(E);
3208 if (PE.isInvalid())
3209 return ExprError();
3210
3211 E = PE.get();
3212
Douglas Gregor0950e412009-03-13 21:01:28 +00003213 // Verify that the operand is valid.
3214 bool isInvalid = false;
3215 if (E->isTypeDependent()) {
3216 // Delay type-checking for type-dependent expressions.
Peter Collingbournee190dee2011-03-11 19:24:49 +00003217 } else if (ExprKind == UETT_AlignOf) {
Chandler Carruth14502c22011-05-26 08:53:10 +00003218 isInvalid = CheckAlignOfExpr(*this, E);
Peter Collingbournee190dee2011-03-11 19:24:49 +00003219 } else if (ExprKind == UETT_VecStep) {
Chandler Carruth14502c22011-05-26 08:53:10 +00003220 isInvalid = CheckVecStepExpr(E);
Douglas Gregor71235ec2009-05-02 02:18:30 +00003221 } else if (E->getBitField()) { // C99 6.5.3.4p1.
Chandler Carruth14502c22011-05-26 08:53:10 +00003222 Diag(E->getExprLoc(), diag::err_sizeof_alignof_bitfield) << 0;
Douglas Gregor0950e412009-03-13 21:01:28 +00003223 isInvalid = true;
3224 } else {
Chandler Carruth14502c22011-05-26 08:53:10 +00003225 isInvalid = CheckUnaryExprOrTypeTraitOperand(E, UETT_SizeOf);
Douglas Gregor0950e412009-03-13 21:01:28 +00003226 }
3227
3228 if (isInvalid)
3229 return ExprError();
3230
Eli Friedmane0afc982012-01-21 01:01:51 +00003231 if (ExprKind == UETT_SizeOf && E->getType()->isVariableArrayType()) {
Benjamin Kramerd81108f2012-11-14 15:08:31 +00003232 PE = TransformToPotentiallyEvaluated(E);
Eli Friedmane0afc982012-01-21 01:01:51 +00003233 if (PE.isInvalid()) return ExprError();
3234 E = PE.take();
3235 }
3236
Douglas Gregor0950e412009-03-13 21:01:28 +00003237 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
Chandler Carruth14502c22011-05-26 08:53:10 +00003238 return Owned(new (Context) UnaryExprOrTypeTraitExpr(
Chandler Carrutha923fb22011-05-29 07:32:14 +00003239 ExprKind, E, Context.getSizeType(), OpLoc,
Chandler Carruth14502c22011-05-26 08:53:10 +00003240 E->getSourceRange().getEnd()));
Douglas Gregor0950e412009-03-13 21:01:28 +00003241}
3242
Peter Collingbournee190dee2011-03-11 19:24:49 +00003243/// ActOnUnaryExprOrTypeTraitExpr - Handle @c sizeof(type) and @c sizeof @c
3244/// expr and the same for @c alignof and @c __alignof
Sebastian Redl6f282892008-11-11 17:56:53 +00003245/// Note that the ArgRange is invalid if isType is false.
John McCalldadc5752010-08-24 06:29:42 +00003246ExprResult
Peter Collingbournee190dee2011-03-11 19:24:49 +00003247Sema::ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
Richard Trieuba63ce62011-09-09 01:45:06 +00003248 UnaryExprOrTypeTrait ExprKind, bool IsType,
Peter Collingbournee190dee2011-03-11 19:24:49 +00003249 void *TyOrEx, const SourceRange &ArgRange) {
Chris Lattner0d8b1a12006-11-20 04:34:45 +00003250 // If error parsing type, ignore.
Sebastian Redlc215cfc2009-01-19 00:08:26 +00003251 if (TyOrEx == 0) return ExprError();
Steve Naroff043d45d2007-05-15 02:32:35 +00003252
Richard Trieuba63ce62011-09-09 01:45:06 +00003253 if (IsType) {
John McCallbcd03502009-12-07 02:54:59 +00003254 TypeSourceInfo *TInfo;
John McCallba7bf592010-08-24 05:47:05 +00003255 (void) GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrEx), &TInfo);
Peter Collingbournee190dee2011-03-11 19:24:49 +00003256 return CreateUnaryExprOrTypeTraitExpr(TInfo, OpLoc, ExprKind, ArgRange);
Mike Stump11289f42009-09-09 15:08:12 +00003257 }
Sebastian Redl6f282892008-11-11 17:56:53 +00003258
Douglas Gregor0950e412009-03-13 21:01:28 +00003259 Expr *ArgEx = (Expr *)TyOrEx;
Chandler Carrutha923fb22011-05-29 07:32:14 +00003260 ExprResult Result = CreateUnaryExprOrTypeTraitExpr(ArgEx, OpLoc, ExprKind);
Benjamin Kramer62b95d82012-08-23 21:35:17 +00003261 return Result;
Chris Lattnere168f762006-11-10 05:29:30 +00003262}
3263
John Wiegley01296292011-04-08 18:41:53 +00003264static QualType CheckRealImagOperand(Sema &S, ExprResult &V, SourceLocation Loc,
Richard Trieuba63ce62011-09-09 01:45:06 +00003265 bool IsReal) {
John Wiegley01296292011-04-08 18:41:53 +00003266 if (V.get()->isTypeDependent())
John McCall4bc41ae2010-11-18 19:01:18 +00003267 return S.Context.DependentTy;
Mike Stump11289f42009-09-09 15:08:12 +00003268
John McCall34376a62010-12-04 03:47:34 +00003269 // _Real and _Imag are only l-values for normal l-values.
John Wiegley01296292011-04-08 18:41:53 +00003270 if (V.get()->getObjectKind() != OK_Ordinary) {
3271 V = S.DefaultLvalueConversion(V.take());
3272 if (V.isInvalid())
3273 return QualType();
3274 }
John McCall34376a62010-12-04 03:47:34 +00003275
Chris Lattnere267f5d2007-08-26 05:39:26 +00003276 // These operators return the element type of a complex type.
John Wiegley01296292011-04-08 18:41:53 +00003277 if (const ComplexType *CT = V.get()->getType()->getAs<ComplexType>())
Chris Lattner30b5dd02007-08-24 21:16:53 +00003278 return CT->getElementType();
Mike Stump11289f42009-09-09 15:08:12 +00003279
Chris Lattnere267f5d2007-08-26 05:39:26 +00003280 // Otherwise they pass through real integer and floating point types here.
John Wiegley01296292011-04-08 18:41:53 +00003281 if (V.get()->getType()->isArithmeticType())
3282 return V.get()->getType();
Mike Stump11289f42009-09-09 15:08:12 +00003283
John McCall36226622010-10-12 02:09:17 +00003284 // Test for placeholders.
John McCall3aef3d82011-04-10 19:13:55 +00003285 ExprResult PR = S.CheckPlaceholderExpr(V.get());
John McCall36226622010-10-12 02:09:17 +00003286 if (PR.isInvalid()) return QualType();
John Wiegley01296292011-04-08 18:41:53 +00003287 if (PR.get() != V.get()) {
Benjamin Kramer62b95d82012-08-23 21:35:17 +00003288 V = PR;
Richard Trieuba63ce62011-09-09 01:45:06 +00003289 return CheckRealImagOperand(S, V, Loc, IsReal);
John McCall36226622010-10-12 02:09:17 +00003290 }
3291
Chris Lattnere267f5d2007-08-26 05:39:26 +00003292 // Reject anything else.
John Wiegley01296292011-04-08 18:41:53 +00003293 S.Diag(Loc, diag::err_realimag_invalid_type) << V.get()->getType()
Richard Trieuba63ce62011-09-09 01:45:06 +00003294 << (IsReal ? "__real" : "__imag");
Chris Lattnere267f5d2007-08-26 05:39:26 +00003295 return QualType();
Chris Lattner30b5dd02007-08-24 21:16:53 +00003296}
3297
3298
Chris Lattnere168f762006-11-10 05:29:30 +00003299
John McCalldadc5752010-08-24 06:29:42 +00003300ExprResult
Sebastian Redlc215cfc2009-01-19 00:08:26 +00003301Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
John McCallb268a282010-08-23 23:25:46 +00003302 tok::TokenKind Kind, Expr *Input) {
John McCalle3027922010-08-25 11:45:40 +00003303 UnaryOperatorKind Opc;
Chris Lattnere168f762006-11-10 05:29:30 +00003304 switch (Kind) {
David Blaikie83d382b2011-09-23 05:06:16 +00003305 default: llvm_unreachable("Unknown unary op!");
John McCalle3027922010-08-25 11:45:40 +00003306 case tok::plusplus: Opc = UO_PostInc; break;
3307 case tok::minusminus: Opc = UO_PostDec; break;
Chris Lattnere168f762006-11-10 05:29:30 +00003308 }
Sebastian Redlc215cfc2009-01-19 00:08:26 +00003309
Sebastian Redla9351792012-02-11 23:51:47 +00003310 // Since this might is a postfix expression, get rid of ParenListExprs.
3311 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Input);
3312 if (Result.isInvalid()) return ExprError();
3313 Input = Result.take();
3314
John McCallb268a282010-08-23 23:25:46 +00003315 return BuildUnaryOp(S, OpLoc, Opc, Input);
Chris Lattnere168f762006-11-10 05:29:30 +00003316}
3317
John McCallf2538342012-07-31 05:14:30 +00003318/// \brief Diagnose if arithmetic on the given ObjC pointer is illegal.
3319///
3320/// \return true on error
3321static bool checkArithmeticOnObjCPointer(Sema &S,
3322 SourceLocation opLoc,
3323 Expr *op) {
3324 assert(op->getType()->isObjCObjectPointerType());
3325 if (S.LangOpts.ObjCRuntime.allowsPointerArithmetic())
3326 return false;
3327
3328 S.Diag(opLoc, diag::err_arithmetic_nonfragile_interface)
3329 << op->getType()->castAs<ObjCObjectPointerType>()->getPointeeType()
3330 << op->getSourceRange();
3331 return true;
3332}
3333
John McCalldadc5752010-08-24 06:29:42 +00003334ExprResult
John McCallb268a282010-08-23 23:25:46 +00003335Sema::ActOnArraySubscriptExpr(Scope *S, Expr *Base, SourceLocation LLoc,
3336 Expr *Idx, SourceLocation RLoc) {
Nate Begeman5ec4b312009-08-10 23:49:36 +00003337 // Since this might be a postfix expression, get rid of ParenListExprs.
John McCalldadc5752010-08-24 06:29:42 +00003338 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
John McCallb268a282010-08-23 23:25:46 +00003339 if (Result.isInvalid()) return ExprError();
3340 Base = Result.take();
Nate Begeman5ec4b312009-08-10 23:49:36 +00003341
John McCallb268a282010-08-23 23:25:46 +00003342 Expr *LHSExp = Base, *RHSExp = Idx;
Mike Stump11289f42009-09-09 15:08:12 +00003343
David Blaikiebbafb8a2012-03-11 07:00:24 +00003344 if (getLangOpts().CPlusPlus &&
Douglas Gregor7a77a6b2009-05-19 00:01:19 +00003345 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) {
Douglas Gregor7a77a6b2009-05-19 00:01:19 +00003346 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
John McCall7decc9e2010-11-18 06:31:45 +00003347 Context.DependentTy,
3348 VK_LValue, OK_Ordinary,
3349 RLoc));
Douglas Gregor7a77a6b2009-05-19 00:01:19 +00003350 }
3351
David Blaikiebbafb8a2012-03-11 07:00:24 +00003352 if (getLangOpts().CPlusPlus &&
Sebastian Redlc215cfc2009-01-19 00:08:26 +00003353 (LHSExp->getType()->isRecordType() ||
Eli Friedman254a1a22008-12-15 22:34:21 +00003354 LHSExp->getType()->isEnumeralType() ||
3355 RHSExp->getType()->isRecordType() ||
Ted Kremeneke65b0862012-03-06 20:05:56 +00003356 RHSExp->getType()->isEnumeralType()) &&
3357 !LHSExp->getType()->isObjCObjectPointerType()) {
John McCallb268a282010-08-23 23:25:46 +00003358 return CreateOverloadedArraySubscriptExpr(LLoc, RLoc, Base, Idx);
Douglas Gregor40412ac2008-11-19 17:17:41 +00003359 }
3360
John McCallb268a282010-08-23 23:25:46 +00003361 return CreateBuiltinArraySubscriptExpr(Base, LLoc, Idx, RLoc);
Sebastian Redladba46e2009-10-29 20:17:01 +00003362}
3363
John McCalldadc5752010-08-24 06:29:42 +00003364ExprResult
John McCallb268a282010-08-23 23:25:46 +00003365Sema::CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
Richard Trieuba63ce62011-09-09 01:45:06 +00003366 Expr *Idx, SourceLocation RLoc) {
John McCallb268a282010-08-23 23:25:46 +00003367 Expr *LHSExp = Base;
3368 Expr *RHSExp = Idx;
Sebastian Redladba46e2009-10-29 20:17:01 +00003369
Chris Lattner36d572b2007-07-16 00:14:47 +00003370 // Perform default conversions.
John Wiegley01296292011-04-08 18:41:53 +00003371 if (!LHSExp->getType()->getAs<VectorType>()) {
3372 ExprResult Result = DefaultFunctionArrayLvalueConversion(LHSExp);
3373 if (Result.isInvalid())
3374 return ExprError();
3375 LHSExp = Result.take();
3376 }
3377 ExprResult Result = DefaultFunctionArrayLvalueConversion(RHSExp);
3378 if (Result.isInvalid())
3379 return ExprError();
3380 RHSExp = Result.take();
Sebastian Redlc215cfc2009-01-19 00:08:26 +00003381
Chris Lattner36d572b2007-07-16 00:14:47 +00003382 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType();
John McCall7decc9e2010-11-18 06:31:45 +00003383 ExprValueKind VK = VK_LValue;
3384 ExprObjectKind OK = OK_Ordinary;
Steve Narofff1e53692007-03-23 22:27:02 +00003385
Steve Naroffc1aadb12007-03-28 21:49:40 +00003386 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent
Chris Lattnerf17bd422007-08-30 17:45:32 +00003387 // to the expression *((e1)+(e2)). This means the array "Base" may actually be
Mike Stump4e1f26a2009-02-19 03:04:26 +00003388 // in the subscript position. As a result, we need to derive the array base
Steve Narofff1e53692007-03-23 22:27:02 +00003389 // and index from the expression types.
Chris Lattner36d572b2007-07-16 00:14:47 +00003390 Expr *BaseExpr, *IndexExpr;
3391 QualType ResultType;
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00003392 if (LHSTy->isDependentType() || RHSTy->isDependentType()) {
3393 BaseExpr = LHSExp;
3394 IndexExpr = RHSExp;
3395 ResultType = Context.DependentTy;
Ted Kremenekc23c7e62009-07-29 21:53:49 +00003396 } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) {
Chris Lattner36d572b2007-07-16 00:14:47 +00003397 BaseExpr = LHSExp;
3398 IndexExpr = RHSExp;
Chris Lattner36d572b2007-07-16 00:14:47 +00003399 ResultType = PTy->getPointeeType();
Mike Stump11289f42009-09-09 15:08:12 +00003400 } else if (const ObjCObjectPointerType *PTy =
John McCallf2538342012-07-31 05:14:30 +00003401 LHSTy->getAs<ObjCObjectPointerType>()) {
Steve Naroff7cae42b2009-07-10 23:34:53 +00003402 BaseExpr = LHSExp;
3403 IndexExpr = RHSExp;
John McCallf2538342012-07-31 05:14:30 +00003404
3405 // Use custom logic if this should be the pseudo-object subscript
3406 // expression.
3407 if (!LangOpts.ObjCRuntime.isSubscriptPointerArithmetic())
3408 return BuildObjCSubscriptExpression(RLoc, BaseExpr, IndexExpr, 0, 0);
3409
Steve Naroff7cae42b2009-07-10 23:34:53 +00003410 ResultType = PTy->getPointeeType();
John McCallf2538342012-07-31 05:14:30 +00003411 if (!LangOpts.ObjCRuntime.allowsPointerArithmetic()) {
3412 Diag(LLoc, diag::err_subscript_nonfragile_interface)
3413 << ResultType << BaseExpr->getSourceRange();
3414 return ExprError();
3415 }
Fariborz Jahanianba0afde2012-03-28 17:56:49 +00003416 } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) {
3417 // Handle the uncommon case of "123[Ptr]".
3418 BaseExpr = RHSExp;
3419 IndexExpr = LHSExp;
3420 ResultType = PTy->getPointeeType();
Mike Stump11289f42009-09-09 15:08:12 +00003421 } else if (const ObjCObjectPointerType *PTy =
John McCall9dd450b2009-09-21 23:43:11 +00003422 RHSTy->getAs<ObjCObjectPointerType>()) {
Steve Naroff7cae42b2009-07-10 23:34:53 +00003423 // Handle the uncommon case of "123[Ptr]".
3424 BaseExpr = RHSExp;
3425 IndexExpr = LHSExp;
3426 ResultType = PTy->getPointeeType();
John McCallf2538342012-07-31 05:14:30 +00003427 if (!LangOpts.ObjCRuntime.allowsPointerArithmetic()) {
3428 Diag(LLoc, diag::err_subscript_nonfragile_interface)
3429 << ResultType << BaseExpr->getSourceRange();
3430 return ExprError();
3431 }
John McCall9dd450b2009-09-21 23:43:11 +00003432 } else if (const VectorType *VTy = LHSTy->getAs<VectorType>()) {
Chris Lattner41977962007-07-31 19:29:30 +00003433 BaseExpr = LHSExp; // vectors: V[123]
Chris Lattner36d572b2007-07-16 00:14:47 +00003434 IndexExpr = RHSExp;
John McCall7decc9e2010-11-18 06:31:45 +00003435 VK = LHSExp->getValueKind();
3436 if (VK != VK_RValue)
3437 OK = OK_VectorComponent;
Nate Begemanc1bf0612009-01-18 00:45:31 +00003438
Chris Lattner36d572b2007-07-16 00:14:47 +00003439 // FIXME: need to deal with const...
3440 ResultType = VTy->getElementType();
Eli Friedmanab2784f2009-04-25 23:46:54 +00003441 } else if (LHSTy->isArrayType()) {
3442 // If we see an array that wasn't promoted by
Douglas Gregorb92a1562010-02-03 00:27:59 +00003443 // DefaultFunctionArrayLvalueConversion, it must be an array that
Eli Friedmanab2784f2009-04-25 23:46:54 +00003444 // wasn't promoted because of the C90 rule that doesn't
3445 // allow promoting non-lvalue arrays. Warn, then
3446 // force the promotion here.
3447 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
3448 LHSExp->getSourceRange();
John Wiegley01296292011-04-08 18:41:53 +00003449 LHSExp = ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy),
3450 CK_ArrayToPointerDecay).take();
Eli Friedmanab2784f2009-04-25 23:46:54 +00003451 LHSTy = LHSExp->getType();
3452
3453 BaseExpr = LHSExp;
3454 IndexExpr = RHSExp;
Ted Kremenekc23c7e62009-07-29 21:53:49 +00003455 ResultType = LHSTy->getAs<PointerType>()->getPointeeType();
Eli Friedmanab2784f2009-04-25 23:46:54 +00003456 } else if (RHSTy->isArrayType()) {
3457 // Same as previous, except for 123[f().a] case
3458 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
3459 RHSExp->getSourceRange();
John Wiegley01296292011-04-08 18:41:53 +00003460 RHSExp = ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy),
3461 CK_ArrayToPointerDecay).take();
Eli Friedmanab2784f2009-04-25 23:46:54 +00003462 RHSTy = RHSExp->getType();
3463
3464 BaseExpr = RHSExp;
3465 IndexExpr = LHSExp;
Ted Kremenekc23c7e62009-07-29 21:53:49 +00003466 ResultType = RHSTy->getAs<PointerType>()->getPointeeType();
Steve Naroffb3096442007-06-09 03:47:53 +00003467 } else {
Chris Lattner003af242009-04-25 22:50:55 +00003468 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value)
3469 << LHSExp->getSourceRange() << RHSExp->getSourceRange());
Sebastian Redlc215cfc2009-01-19 00:08:26 +00003470 }
Steve Naroffc1aadb12007-03-28 21:49:40 +00003471 // C99 6.5.2.1p1
Douglas Gregor5cc2c8b2010-07-23 15:58:24 +00003472 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent())
Chris Lattner003af242009-04-25 22:50:55 +00003473 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer)
3474 << IndexExpr->getSourceRange());
Steve Naroffb29cdd52007-07-10 18:23:31 +00003475
Daniel Dunbar4782a6e2009-09-17 06:31:17 +00003476 if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
Sam Weinigb7608d72009-09-14 20:14:57 +00003477 IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
3478 && !IndexExpr->isTypeDependent())
Sam Weinig914244e2009-09-14 01:58:58 +00003479 Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange();
3480
Douglas Gregorac1fb652009-03-24 19:52:54 +00003481 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
Mike Stump11289f42009-09-09 15:08:12 +00003482 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object
3483 // type. Note that Functions are not objects, and that (in C99 parlance)
Douglas Gregorac1fb652009-03-24 19:52:54 +00003484 // incomplete types are not object types.
3485 if (ResultType->isFunctionType()) {
3486 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type)
3487 << ResultType << BaseExpr->getSourceRange();
3488 return ExprError();
3489 }
Mike Stump11289f42009-09-09 15:08:12 +00003490
David Blaikiebbafb8a2012-03-11 07:00:24 +00003491 if (ResultType->isVoidType() && !getLangOpts().CPlusPlus) {
Abramo Bagnara3aabb4b2010-09-13 06:50:07 +00003492 // GNU extension: subscripting on pointer to void
Chandler Carruth4cc3f292011-06-27 16:32:27 +00003493 Diag(LLoc, diag::ext_gnu_subscript_void_type)
3494 << BaseExpr->getSourceRange();
John McCall4bc41ae2010-11-18 19:01:18 +00003495
3496 // C forbids expressions of unqualified void type from being l-values.
3497 // See IsCForbiddenLValueType.
3498 if (!ResultType.hasQualifiers()) VK = VK_RValue;
Abramo Bagnara3aabb4b2010-09-13 06:50:07 +00003499 } else if (!ResultType->isDependentType() &&
Mike Stump11289f42009-09-09 15:08:12 +00003500 RequireCompleteType(LLoc, ResultType,
Douglas Gregor7bfb2d02012-05-04 16:32:21 +00003501 diag::err_subscript_incomplete_type, BaseExpr))
Douglas Gregorac1fb652009-03-24 19:52:54 +00003502 return ExprError();
Mike Stump11289f42009-09-09 15:08:12 +00003503
John McCall4bc41ae2010-11-18 19:01:18 +00003504 assert(VK == VK_RValue || LangOpts.CPlusPlus ||
Douglas Gregor5476205b2011-06-23 00:49:38 +00003505 !ResultType.isCForbiddenLValueType());
John McCall4bc41ae2010-11-18 19:01:18 +00003506
Mike Stump4e1f26a2009-02-19 03:04:26 +00003507 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
John McCall7decc9e2010-11-18 06:31:45 +00003508 ResultType, VK, OK, RLoc));
Chris Lattnere168f762006-11-10 05:29:30 +00003509}
3510
John McCalldadc5752010-08-24 06:29:42 +00003511ExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc,
Nico Weber44887f62010-11-29 18:19:25 +00003512 FunctionDecl *FD,
3513 ParmVarDecl *Param) {
Anders Carlsson355933d2009-08-25 03:49:14 +00003514 if (Param->hasUnparsedDefaultArg()) {
Douglas Gregor8a01b2a2010-09-11 20:24:53 +00003515 Diag(CallLoc,
Nico Weberebd45a02010-11-30 04:44:33 +00003516 diag::err_use_of_default_argument_to_function_declared_later) <<
Anders Carlsson355933d2009-08-25 03:49:14 +00003517 FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName();
Mike Stump11289f42009-09-09 15:08:12 +00003518 Diag(UnparsedDefaultArgLocs[Param],
Nico Weberebd45a02010-11-30 04:44:33 +00003519 diag::note_default_argument_declared_here);
Douglas Gregor8a01b2a2010-09-11 20:24:53 +00003520 return ExprError();
3521 }
3522
3523 if (Param->hasUninstantiatedDefaultArg()) {
3524 Expr *UninstExpr = Param->getUninstantiatedDefaultArg();
Anders Carlsson355933d2009-08-25 03:49:14 +00003525
Richard Smith505df232012-07-22 23:45:10 +00003526 EnterExpressionEvaluationContext EvalContext(*this, PotentiallyEvaluated,
3527 Param);
3528
Douglas Gregor8a01b2a2010-09-11 20:24:53 +00003529 // Instantiate the expression.
3530 MultiLevelTemplateArgumentList ArgList
3531 = getTemplateInstantiationArgs(FD, 0, /*RelativeToPrimary=*/true);
Anders Carlsson657bad42009-09-05 05:14:19 +00003532
Nico Weber44887f62010-11-29 18:19:25 +00003533 std::pair<const TemplateArgument *, unsigned> Innermost
Douglas Gregor8a01b2a2010-09-11 20:24:53 +00003534 = ArgList.getInnermost();
Richard Smith80934652012-07-16 01:09:10 +00003535 InstantiatingTemplate Inst(*this, CallLoc, Param,
3536 ArrayRef<TemplateArgument>(Innermost.first,
3537 Innermost.second));
Richard Smith8a874c92012-07-08 02:38:24 +00003538 if (Inst)
3539 return ExprError();
Anders Carlsson355933d2009-08-25 03:49:14 +00003540
Nico Weber44887f62010-11-29 18:19:25 +00003541 ExprResult Result;
3542 {
3543 // C++ [dcl.fct.default]p5:
3544 // The names in the [default argument] expression are bound, and
3545 // the semantic constraints are checked, at the point where the
3546 // default argument expression appears.
Nico Weberebd45a02010-11-30 04:44:33 +00003547 ContextRAII SavedContext(*this, FD);
Douglas Gregora86bc002012-02-16 21:36:18 +00003548 LocalInstantiationScope Local(*this);
Nico Weber44887f62010-11-29 18:19:25 +00003549 Result = SubstExpr(UninstExpr, ArgList);
3550 }
Douglas Gregor8a01b2a2010-09-11 20:24:53 +00003551 if (Result.isInvalid())
3552 return ExprError();
Mike Stump11289f42009-09-09 15:08:12 +00003553
Douglas Gregor8a01b2a2010-09-11 20:24:53 +00003554 // Check the expression as an initializer for the parameter.
3555 InitializedEntity Entity
Fariborz Jahanian8fb87ae2010-09-24 17:30:16 +00003556 = InitializedEntity::InitializeParameter(Context, Param);
Douglas Gregor8a01b2a2010-09-11 20:24:53 +00003557 InitializationKind Kind
3558 = InitializationKind::CreateCopy(Param->getLocation(),
Daniel Dunbar62ee6412012-03-09 18:35:03 +00003559 /*FIXME:EqualLoc*/UninstExpr->getLocStart());
Douglas Gregor8a01b2a2010-09-11 20:24:53 +00003560 Expr *ResultE = Result.takeAs<Expr>();
Douglas Gregor25ab25f2009-12-23 18:19:08 +00003561
Douglas Gregor8a01b2a2010-09-11 20:24:53 +00003562 InitializationSequence InitSeq(*this, Entity, Kind, &ResultE, 1);
Benjamin Kramercc4c49d2012-08-23 23:38:35 +00003563 Result = InitSeq.Perform(*this, Entity, Kind, ResultE);
Douglas Gregor8a01b2a2010-09-11 20:24:53 +00003564 if (Result.isInvalid())
3565 return ExprError();
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00003566
David Blaikief68e8092012-04-30 18:21:31 +00003567 Expr *Arg = Result.takeAs<Expr>();
Richard Smithc406cb72013-01-17 01:17:56 +00003568 CheckCompletedExpr(Arg, Param->getOuterLocStart());
Douglas Gregor8a01b2a2010-09-11 20:24:53 +00003569 // Build the default argument expression.
David Blaikief68e8092012-04-30 18:21:31 +00003570 return Owned(CXXDefaultArgExpr::Create(Context, CallLoc, Param, Arg));
Anders Carlsson355933d2009-08-25 03:49:14 +00003571 }
3572
Douglas Gregor8a01b2a2010-09-11 20:24:53 +00003573 // If the default expression creates temporaries, we need to
3574 // push them to the current stack of expression temporaries so they'll
3575 // be properly destroyed.
3576 // FIXME: We should really be rebuilding the default argument with new
3577 // bound temporaries; see the comment in PR5810.
John McCall28fc7092011-11-10 05:35:25 +00003578 // We don't need to do that with block decls, though, because
3579 // blocks in default argument expression can never capture anything.
3580 if (isa<ExprWithCleanups>(Param->getInit())) {
3581 // Set the "needs cleanups" bit regardless of whether there are
3582 // any explicit objects.
John McCall31168b02011-06-15 23:02:42 +00003583 ExprNeedsCleanups = true;
John McCall28fc7092011-11-10 05:35:25 +00003584
3585 // Append all the objects to the cleanup list. Right now, this
3586 // should always be a no-op, because blocks in default argument
3587 // expressions should never be able to capture anything.
3588 assert(!cast<ExprWithCleanups>(Param->getInit())->getNumObjects() &&
3589 "default argument expression has capturing blocks?");
Douglas Gregor6ed2fee2010-09-14 22:55:20 +00003590 }
Douglas Gregor8a01b2a2010-09-11 20:24:53 +00003591
3592 // We already type-checked the argument, so we know it works.
Douglas Gregor32b3de52010-09-11 23:32:50 +00003593 // Just mark all of the declarations in this potentially-evaluated expression
3594 // as being "referenced".
Douglas Gregor680e9e02012-02-21 19:11:17 +00003595 MarkDeclarationsReferencedInExpr(Param->getDefaultArg(),
3596 /*SkipLocalVariables=*/true);
Douglas Gregor033f6752009-12-23 23:03:06 +00003597 return Owned(CXXDefaultArgExpr::Create(Context, CallLoc, Param));
Anders Carlsson355933d2009-08-25 03:49:14 +00003598}
3599
Richard Smith55ce3522012-06-25 20:30:08 +00003600
3601Sema::VariadicCallType
3602Sema::getVariadicCallType(FunctionDecl *FDecl, const FunctionProtoType *Proto,
3603 Expr *Fn) {
3604 if (Proto && Proto->isVariadic()) {
3605 if (dyn_cast_or_null<CXXConstructorDecl>(FDecl))
3606 return VariadicConstructor;
3607 else if (Fn && Fn->getType()->isBlockPointerType())
3608 return VariadicBlock;
3609 else if (FDecl) {
3610 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
3611 if (Method->isInstance())
3612 return VariadicMethod;
3613 }
3614 return VariadicFunction;
3615 }
3616 return VariadicDoesNotApply;
3617}
3618
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003619/// ConvertArgumentsForCall - Converts the arguments specified in
3620/// Args/NumArgs to the parameter types of the function FDecl with
3621/// function prototype Proto. Call is the call expression itself, and
3622/// Fn is the function expression. For a C++ member function, this
3623/// routine does not attempt to convert the object argument. Returns
3624/// true if the call is ill-formed.
Mike Stump4e1f26a2009-02-19 03:04:26 +00003625bool
3626Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003627 FunctionDecl *FDecl,
Douglas Gregordeaad8c2009-02-26 23:50:07 +00003628 const FunctionProtoType *Proto,
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003629 Expr **Args, unsigned NumArgs,
Peter Collingbourne619a8c72011-10-02 23:49:29 +00003630 SourceLocation RParenLoc,
3631 bool IsExecConfig) {
John McCallbebede42011-02-26 05:39:39 +00003632 // Bail out early if calling a builtin with custom typechecking.
3633 // We don't need to do this in the
3634 if (FDecl)
3635 if (unsigned ID = FDecl->getBuiltinID())
3636 if (Context.BuiltinInfo.hasCustomTypechecking(ID))
3637 return false;
3638
Mike Stump4e1f26a2009-02-19 03:04:26 +00003639 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003640 // assignment, to the types of the corresponding parameter, ...
3641 unsigned NumArgsInProto = Proto->getNumArgs();
Douglas Gregorb6b99612009-01-23 21:30:56 +00003642 bool Invalid = false;
Peter Collingbourne740afe22011-10-02 23:49:20 +00003643 unsigned MinArgs = FDecl ? FDecl->getMinRequiredArguments() : NumArgsInProto;
Peter Collingbourne619a8c72011-10-02 23:49:29 +00003644 unsigned FnKind = Fn->getType()->isBlockPointerType()
3645 ? 1 /* block */
3646 : (IsExecConfig ? 3 /* kernel function (exec config) */
3647 : 0 /* function */);
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00003648
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003649 // If too few arguments are available (and we don't have default
3650 // arguments for the remaining parameters), don't make the call.
3651 if (NumArgs < NumArgsInProto) {
Peter Collingbourne740afe22011-10-02 23:49:20 +00003652 if (NumArgs < MinArgs) {
Richard Smith10ff50d2012-05-11 05:16:41 +00003653 if (MinArgs == 1 && FDecl && FDecl->getParamDecl(0)->getDeclName())
3654 Diag(RParenLoc, MinArgs == NumArgsInProto && !Proto->isVariadic()
3655 ? diag::err_typecheck_call_too_few_args_one
3656 : diag::err_typecheck_call_too_few_args_at_least_one)
3657 << FnKind
3658 << FDecl->getParamDecl(0) << Fn->getSourceRange();
3659 else
3660 Diag(RParenLoc, MinArgs == NumArgsInProto && !Proto->isVariadic()
3661 ? diag::err_typecheck_call_too_few_args
3662 : diag::err_typecheck_call_too_few_args_at_least)
3663 << FnKind
3664 << MinArgs << NumArgs << Fn->getSourceRange();
Peter Collingbourne3bc84ca2011-07-29 00:24:42 +00003665
3666 // Emit the location of the prototype.
Peter Collingbourne619a8c72011-10-02 23:49:29 +00003667 if (FDecl && !FDecl->getBuiltinID() && !IsExecConfig)
Peter Collingbourne3bc84ca2011-07-29 00:24:42 +00003668 Diag(FDecl->getLocStart(), diag::note_callee_decl)
3669 << FDecl;
3670
3671 return true;
3672 }
Ted Kremenek5a201952009-02-07 01:47:29 +00003673 Call->setNumArgs(Context, NumArgsInProto);
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003674 }
3675
3676 // If too many are passed and not variadic, error on the extras and drop
3677 // them.
3678 if (NumArgs > NumArgsInProto) {
3679 if (!Proto->isVariadic()) {
Richard Smithd72da152012-05-15 06:21:54 +00003680 if (NumArgsInProto == 1 && FDecl && FDecl->getParamDecl(0)->getDeclName())
3681 Diag(Args[NumArgsInProto]->getLocStart(),
3682 MinArgs == NumArgsInProto
3683 ? diag::err_typecheck_call_too_many_args_one
3684 : diag::err_typecheck_call_too_many_args_at_most_one)
3685 << FnKind
3686 << FDecl->getParamDecl(0) << NumArgs << Fn->getSourceRange()
3687 << SourceRange(Args[NumArgsInProto]->getLocStart(),
3688 Args[NumArgs-1]->getLocEnd());
3689 else
3690 Diag(Args[NumArgsInProto]->getLocStart(),
3691 MinArgs == NumArgsInProto
3692 ? diag::err_typecheck_call_too_many_args
3693 : diag::err_typecheck_call_too_many_args_at_most)
3694 << FnKind
3695 << NumArgsInProto << NumArgs << Fn->getSourceRange()
3696 << SourceRange(Args[NumArgsInProto]->getLocStart(),
3697 Args[NumArgs-1]->getLocEnd());
Ted Kremenek99a337e2011-04-04 17:22:27 +00003698
3699 // Emit the location of the prototype.
Peter Collingbourne619a8c72011-10-02 23:49:29 +00003700 if (FDecl && !FDecl->getBuiltinID() && !IsExecConfig)
Peter Collingbourne3bc84ca2011-07-29 00:24:42 +00003701 Diag(FDecl->getLocStart(), diag::note_callee_decl)
3702 << FDecl;
Ted Kremenek99a337e2011-04-04 17:22:27 +00003703
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003704 // This deletes the extra arguments.
Ted Kremenek5a201952009-02-07 01:47:29 +00003705 Call->setNumArgs(Context, NumArgsInProto);
Fariborz Jahanian835026e2009-11-24 18:29:37 +00003706 return true;
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003707 }
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003708 }
Chris Lattner0e62c1c2011-07-23 10:55:15 +00003709 SmallVector<Expr *, 8> AllArgs;
Richard Smith55ce3522012-06-25 20:30:08 +00003710 VariadicCallType CallType = getVariadicCallType(FDecl, Proto, Fn);
3711
Daniel Dunbar62ee6412012-03-09 18:35:03 +00003712 Invalid = GatherArgumentsForCall(Call->getLocStart(), FDecl,
Fariborz Jahanian4fa66ce2009-11-24 21:37:28 +00003713 Proto, 0, Args, NumArgs, AllArgs, CallType);
Fariborz Jahanian835026e2009-11-24 18:29:37 +00003714 if (Invalid)
3715 return true;
3716 unsigned TotalNumArgs = AllArgs.size();
3717 for (unsigned i = 0; i < TotalNumArgs; ++i)
3718 Call->setArg(i, AllArgs[i]);
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00003719
Fariborz Jahanian835026e2009-11-24 18:29:37 +00003720 return false;
3721}
Mike Stump4e1f26a2009-02-19 03:04:26 +00003722
Fariborz Jahanian835026e2009-11-24 18:29:37 +00003723bool Sema::GatherArgumentsForCall(SourceLocation CallLoc,
3724 FunctionDecl *FDecl,
3725 const FunctionProtoType *Proto,
3726 unsigned FirstProtoArg,
3727 Expr **Args, unsigned NumArgs,
Chris Lattner0e62c1c2011-07-23 10:55:15 +00003728 SmallVector<Expr *, 8> &AllArgs,
Douglas Gregor6073dca2012-02-24 23:56:31 +00003729 VariadicCallType CallType,
Richard Smith6b216962013-02-05 05:52:24 +00003730 bool AllowExplicit,
3731 bool IsListInitialization) {
Fariborz Jahanian835026e2009-11-24 18:29:37 +00003732 unsigned NumArgsInProto = Proto->getNumArgs();
3733 unsigned NumArgsToCheck = NumArgs;
3734 bool Invalid = false;
3735 if (NumArgs != NumArgsInProto)
3736 // Use default arguments for missing arguments
3737 NumArgsToCheck = NumArgsInProto;
3738 unsigned ArgIx = 0;
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003739 // Continue to check argument types (even if we have too few/many args).
Fariborz Jahanian835026e2009-11-24 18:29:37 +00003740 for (unsigned i = FirstProtoArg; i != NumArgsToCheck; i++) {
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003741 QualType ProtoArgType = Proto->getArgType(i);
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00003742
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003743 Expr *Arg;
Peter Collingbournea48f33f2011-10-19 00:16:45 +00003744 ParmVarDecl *Param;
Fariborz Jahanian835026e2009-11-24 18:29:37 +00003745 if (ArgIx < NumArgs) {
3746 Arg = Args[ArgIx++];
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00003747
Daniel Dunbar62ee6412012-03-09 18:35:03 +00003748 if (RequireCompleteType(Arg->getLocStart(),
Eli Friedman3164fb12009-03-22 22:00:50 +00003749 ProtoArgType,
Douglas Gregor7bfb2d02012-05-04 16:32:21 +00003750 diag::err_call_incomplete_argument, Arg))
Eli Friedman3164fb12009-03-22 22:00:50 +00003751 return true;
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00003752
Douglas Gregorbbeb5c32009-12-22 16:09:06 +00003753 // Pass the argument
Peter Collingbournea48f33f2011-10-19 00:16:45 +00003754 Param = 0;
Douglas Gregorbbeb5c32009-12-22 16:09:06 +00003755 if (FDecl && i < FDecl->getNumParams())
3756 Param = FDecl->getParamDecl(i);
Douglas Gregor96596c92009-12-22 07:24:36 +00003757
John McCall4124c492011-10-17 18:40:02 +00003758 // Strip the unbridged-cast placeholder expression off, if applicable.
3759 if (Arg->getType() == Context.ARCUnbridgedCastTy &&
3760 FDecl && FDecl->hasAttr<CFAuditedTransferAttr>() &&
3761 (!Param || !Param->hasAttr<CFConsumedAttr>()))
3762 Arg = stripARCUnbridgedCast(Arg);
3763
Rafael Espindola8778c282012-11-29 16:09:03 +00003764 InitializedEntity Entity = Param ?
3765 InitializedEntity::InitializeParameter(Context, Param, ProtoArgType)
3766 : InitializedEntity::InitializeParameter(Context, ProtoArgType,
3767 Proto->isArgConsumed(i));
John McCalldadc5752010-08-24 06:29:42 +00003768 ExprResult ArgE = PerformCopyInitialization(Entity,
John McCall34376a62010-12-04 03:47:34 +00003769 SourceLocation(),
Douglas Gregor6073dca2012-02-24 23:56:31 +00003770 Owned(Arg),
Richard Smith6b216962013-02-05 05:52:24 +00003771 IsListInitialization,
Douglas Gregor6073dca2012-02-24 23:56:31 +00003772 AllowExplicit);
Douglas Gregorbbeb5c32009-12-22 16:09:06 +00003773 if (ArgE.isInvalid())
3774 return true;
3775
3776 Arg = ArgE.takeAs<Expr>();
Anders Carlsson84613c42009-06-12 16:51:40 +00003777 } else {
Peter Collingbournea48f33f2011-10-19 00:16:45 +00003778 Param = FDecl->getParamDecl(i);
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00003779
John McCalldadc5752010-08-24 06:29:42 +00003780 ExprResult ArgExpr =
Fariborz Jahanian835026e2009-11-24 18:29:37 +00003781 BuildCXXDefaultArgExpr(CallLoc, FDecl, Param);
Anders Carlsson355933d2009-08-25 03:49:14 +00003782 if (ArgExpr.isInvalid())
3783 return true;
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00003784
Anders Carlsson355933d2009-08-25 03:49:14 +00003785 Arg = ArgExpr.takeAs<Expr>();
Anders Carlsson84613c42009-06-12 16:51:40 +00003786 }
Kaelyn Uhrain2e7aa5a2011-08-05 23:18:04 +00003787
3788 // Check for array bounds violations for each argument to the call. This
3789 // check only triggers warnings when the argument isn't a more complex Expr
3790 // with its own checking, such as a BinaryOperator.
3791 CheckArrayAccess(Arg);
3792
Peter Collingbournea48f33f2011-10-19 00:16:45 +00003793 // Check for violations of C99 static array rules (C99 6.7.5.3p7).
3794 CheckStaticArrayArgument(CallLoc, Param, Arg);
3795
Fariborz Jahanian835026e2009-11-24 18:29:37 +00003796 AllArgs.push_back(Arg);
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003797 }
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00003798
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003799 // If this is a variadic call, handle args passed through "...".
Fariborz Jahanian6f2d25e2009-11-24 19:27:49 +00003800 if (CallType != VariadicDoesNotApply) {
John McCall2979fe02011-04-12 00:42:48 +00003801 // Assume that extern "C" functions with variadic arguments that
3802 // return __unknown_anytype aren't *really* variadic.
3803 if (Proto->getResultType() == Context.UnknownAnyTy &&
3804 FDecl && FDecl->isExternC()) {
3805 for (unsigned i = ArgIx; i != NumArgs; ++i) {
3806 ExprResult arg;
3807 if (isa<ExplicitCastExpr>(Args[i]->IgnoreParens()))
3808 arg = DefaultFunctionArrayLvalueConversion(Args[i]);
3809 else
3810 arg = DefaultVariadicArgumentPromotion(Args[i], CallType, FDecl);
3811 Invalid |= arg.isInvalid();
3812 AllArgs.push_back(arg.take());
3813 }
3814
3815 // Otherwise do argument promotion, (C99 6.5.2.2p7).
3816 } else {
3817 for (unsigned i = ArgIx; i != NumArgs; ++i) {
Richard Trieucfc491d2011-08-02 04:35:43 +00003818 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], CallType,
3819 FDecl);
John McCall2979fe02011-04-12 00:42:48 +00003820 Invalid |= Arg.isInvalid();
3821 AllArgs.push_back(Arg.take());
3822 }
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003823 }
Ted Kremenekd41f3462011-09-26 23:36:13 +00003824
3825 // Check for array bounds violations.
3826 for (unsigned i = ArgIx; i != NumArgs; ++i)
3827 CheckArrayAccess(Args[i]);
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003828 }
Douglas Gregorb6b99612009-01-23 21:30:56 +00003829 return Invalid;
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003830}
3831
Peter Collingbournea48f33f2011-10-19 00:16:45 +00003832static void DiagnoseCalleeStaticArrayParam(Sema &S, ParmVarDecl *PVD) {
3833 TypeLoc TL = PVD->getTypeSourceInfo()->getTypeLoc();
3834 if (ArrayTypeLoc *ATL = dyn_cast<ArrayTypeLoc>(&TL))
3835 S.Diag(PVD->getLocation(), diag::note_callee_static_array)
3836 << ATL->getLocalSourceRange();
3837}
3838
3839/// CheckStaticArrayArgument - If the given argument corresponds to a static
3840/// array parameter, check that it is non-null, and that if it is formed by
3841/// array-to-pointer decay, the underlying array is sufficiently large.
3842///
3843/// C99 6.7.5.3p7: If the keyword static also appears within the [ and ] of the
3844/// array type derivation, then for each call to the function, the value of the
3845/// corresponding actual argument shall provide access to the first element of
3846/// an array with at least as many elements as specified by the size expression.
3847void
3848Sema::CheckStaticArrayArgument(SourceLocation CallLoc,
3849 ParmVarDecl *Param,
3850 const Expr *ArgExpr) {
3851 // Static array parameters are not supported in C++.
David Blaikiebbafb8a2012-03-11 07:00:24 +00003852 if (!Param || getLangOpts().CPlusPlus)
Peter Collingbournea48f33f2011-10-19 00:16:45 +00003853 return;
3854
3855 QualType OrigTy = Param->getOriginalType();
3856
3857 const ArrayType *AT = Context.getAsArrayType(OrigTy);
3858 if (!AT || AT->getSizeModifier() != ArrayType::Static)
3859 return;
3860
3861 if (ArgExpr->isNullPointerConstant(Context,
3862 Expr::NPC_NeverValueDependent)) {
3863 Diag(CallLoc, diag::warn_null_arg) << ArgExpr->getSourceRange();
3864 DiagnoseCalleeStaticArrayParam(*this, Param);
3865 return;
3866 }
3867
3868 const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT);
3869 if (!CAT)
3870 return;
3871
3872 const ConstantArrayType *ArgCAT =
3873 Context.getAsConstantArrayType(ArgExpr->IgnoreParenImpCasts()->getType());
3874 if (!ArgCAT)
3875 return;
3876
3877 if (ArgCAT->getSize().ult(CAT->getSize())) {
3878 Diag(CallLoc, diag::warn_static_array_too_small)
3879 << ArgExpr->getSourceRange()
3880 << (unsigned) ArgCAT->getSize().getZExtValue()
3881 << (unsigned) CAT->getSize().getZExtValue();
3882 DiagnoseCalleeStaticArrayParam(*this, Param);
3883 }
3884}
3885
John McCall2979fe02011-04-12 00:42:48 +00003886/// Given a function expression of unknown-any type, try to rebuild it
3887/// to have a function type.
3888static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *fn);
3889
Steve Naroff83895f72007-09-16 03:34:24 +00003890/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
Chris Lattnere168f762006-11-10 05:29:30 +00003891/// This provides the location of the left/right parens and a list of comma
3892/// locations.
John McCalldadc5752010-08-24 06:29:42 +00003893ExprResult
John McCallb268a282010-08-23 23:25:46 +00003894Sema::ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc,
Richard Trieuba63ce62011-09-09 01:45:06 +00003895 MultiExprArg ArgExprs, SourceLocation RParenLoc,
Peter Collingbourne619a8c72011-10-02 23:49:29 +00003896 Expr *ExecConfig, bool IsExecConfig) {
Nate Begeman5ec4b312009-08-10 23:49:36 +00003897 // Since this might be a postfix expression, get rid of ParenListExprs.
John McCalldadc5752010-08-24 06:29:42 +00003898 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Fn);
John McCallb268a282010-08-23 23:25:46 +00003899 if (Result.isInvalid()) return ExprError();
3900 Fn = Result.take();
Mike Stump11289f42009-09-09 15:08:12 +00003901
David Blaikiebbafb8a2012-03-11 07:00:24 +00003902 if (getLangOpts().CPlusPlus) {
Douglas Gregorad8a3362009-09-04 17:36:40 +00003903 // If this is a pseudo-destructor expression, build the call immediately.
3904 if (isa<CXXPseudoDestructorExpr>(Fn)) {
Benjamin Kramerc215e762012-08-24 11:54:20 +00003905 if (!ArgExprs.empty()) {
Douglas Gregorad8a3362009-09-04 17:36:40 +00003906 // Pseudo-destructor calls should not have any arguments.
3907 Diag(Fn->getLocStart(), diag::err_pseudo_dtor_call_with_args)
Douglas Gregora771f462010-03-31 17:46:05 +00003908 << FixItHint::CreateRemoval(
Benjamin Kramerc215e762012-08-24 11:54:20 +00003909 SourceRange(ArgExprs[0]->getLocStart(),
3910 ArgExprs.back()->getLocEnd()));
Douglas Gregorad8a3362009-09-04 17:36:40 +00003911 }
Mike Stump11289f42009-09-09 15:08:12 +00003912
Benjamin Kramerc215e762012-08-24 11:54:20 +00003913 return Owned(new (Context) CallExpr(Context, Fn, MultiExprArg(),
3914 Context.VoidTy, VK_RValue,
3915 RParenLoc));
Douglas Gregorad8a3362009-09-04 17:36:40 +00003916 }
Mike Stump11289f42009-09-09 15:08:12 +00003917
Douglas Gregorb8a9a412009-02-04 15:01:18 +00003918 // Determine whether this is a dependent call inside a C++ template,
Mike Stump4e1f26a2009-02-19 03:04:26 +00003919 // in which case we won't do any semantic analysis now.
Mike Stump87c57ac2009-05-16 07:39:55 +00003920 // FIXME: Will need to cache the results of name lookup (including ADL) in
3921 // Fn.
Douglas Gregorb8a9a412009-02-04 15:01:18 +00003922 bool Dependent = false;
3923 if (Fn->isTypeDependent())
3924 Dependent = true;
Benjamin Kramerc215e762012-08-24 11:54:20 +00003925 else if (Expr::hasAnyTypeDependentArguments(ArgExprs))
Douglas Gregorb8a9a412009-02-04 15:01:18 +00003926 Dependent = true;
3927
Peter Collingbourne41f85462011-02-09 21:07:24 +00003928 if (Dependent) {
3929 if (ExecConfig) {
3930 return Owned(new (Context) CUDAKernelCallExpr(
Benjamin Kramerc215e762012-08-24 11:54:20 +00003931 Context, Fn, cast<CallExpr>(ExecConfig), ArgExprs,
Peter Collingbourne41f85462011-02-09 21:07:24 +00003932 Context.DependentTy, VK_RValue, RParenLoc));
3933 } else {
Benjamin Kramerc215e762012-08-24 11:54:20 +00003934 return Owned(new (Context) CallExpr(Context, Fn, ArgExprs,
Peter Collingbourne41f85462011-02-09 21:07:24 +00003935 Context.DependentTy, VK_RValue,
3936 RParenLoc));
3937 }
3938 }
Douglas Gregorb8a9a412009-02-04 15:01:18 +00003939
3940 // Determine whether this is a call to an object (C++ [over.call.object]).
3941 if (Fn->getType()->isRecordType())
Benjamin Kramerc215e762012-08-24 11:54:20 +00003942 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc,
3943 ArgExprs.data(),
3944 ArgExprs.size(), RParenLoc));
Douglas Gregorb8a9a412009-02-04 15:01:18 +00003945
John McCall2979fe02011-04-12 00:42:48 +00003946 if (Fn->getType() == Context.UnknownAnyTy) {
3947 ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
3948 if (result.isInvalid()) return ExprError();
3949 Fn = result.take();
3950 }
3951
John McCall0009fcc2011-04-26 20:42:42 +00003952 if (Fn->getType() == Context.BoundMemberTy) {
Benjamin Kramerc215e762012-08-24 11:54:20 +00003953 return BuildCallToMemberFunction(S, Fn, LParenLoc, ArgExprs.data(),
3954 ArgExprs.size(), RParenLoc);
John McCall10eae182009-11-30 22:42:35 +00003955 }
John McCall0009fcc2011-04-26 20:42:42 +00003956 }
John McCall10eae182009-11-30 22:42:35 +00003957
John McCall0009fcc2011-04-26 20:42:42 +00003958 // Check for overloaded calls. This can happen even in C due to extensions.
3959 if (Fn->getType() == Context.OverloadTy) {
3960 OverloadExpr::FindResult find = OverloadExpr::find(Fn);
3961
Douglas Gregorcda22702011-10-13 18:10:35 +00003962 // We aren't supposed to apply this logic for if there's an '&' involved.
Douglas Gregorf4a06c22011-10-13 18:26:27 +00003963 if (!find.HasFormOfMemberPointer) {
John McCall0009fcc2011-04-26 20:42:42 +00003964 OverloadExpr *ovl = find.Expression;
3965 if (isa<UnresolvedLookupExpr>(ovl)) {
3966 UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(ovl);
Benjamin Kramerc215e762012-08-24 11:54:20 +00003967 return BuildOverloadedCallExpr(S, Fn, ULE, LParenLoc, ArgExprs.data(),
3968 ArgExprs.size(), RParenLoc, ExecConfig);
John McCall0009fcc2011-04-26 20:42:42 +00003969 } else {
Benjamin Kramerc215e762012-08-24 11:54:20 +00003970 return BuildCallToMemberFunction(S, Fn, LParenLoc, ArgExprs.data(),
3971 ArgExprs.size(), RParenLoc);
Anders Carlsson61914b52009-10-03 17:40:22 +00003972 }
3973 }
Douglas Gregor97fd6e22008-12-22 05:46:06 +00003974 }
3975
Douglas Gregore254f902009-02-04 00:32:51 +00003976 // If we're directly calling a function, get the appropriate declaration.
Douglas Gregord8fb1e32011-12-01 01:37:36 +00003977 if (Fn->getType() == Context.UnknownAnyTy) {
3978 ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
3979 if (result.isInvalid()) return ExprError();
3980 Fn = result.take();
3981 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00003982
Eli Friedmane14b1992009-12-26 03:35:45 +00003983 Expr *NakedFn = Fn->IgnoreParens();
Douglas Gregor928479e2010-11-09 20:03:54 +00003984
John McCall57500772009-12-16 12:17:52 +00003985 NamedDecl *NDecl = 0;
Douglas Gregor59f16ed2010-10-25 20:48:33 +00003986 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(NakedFn))
3987 if (UnOp->getOpcode() == UO_AddrOf)
3988 NakedFn = UnOp->getSubExpr()->IgnoreParens();
3989
John McCall57500772009-12-16 12:17:52 +00003990 if (isa<DeclRefExpr>(NakedFn))
3991 NDecl = cast<DeclRefExpr>(NakedFn)->getDecl();
John McCall0009fcc2011-04-26 20:42:42 +00003992 else if (isa<MemberExpr>(NakedFn))
3993 NDecl = cast<MemberExpr>(NakedFn)->getMemberDecl();
John McCall57500772009-12-16 12:17:52 +00003994
Benjamin Kramerc215e762012-08-24 11:54:20 +00003995 return BuildResolvedCallExpr(Fn, NDecl, LParenLoc, ArgExprs.data(),
3996 ArgExprs.size(), RParenLoc, ExecConfig,
3997 IsExecConfig);
Peter Collingbourne41f85462011-02-09 21:07:24 +00003998}
3999
4000ExprResult
4001Sema::ActOnCUDAExecConfigExpr(Scope *S, SourceLocation LLLLoc,
Richard Trieuba63ce62011-09-09 01:45:06 +00004002 MultiExprArg ExecConfig, SourceLocation GGGLoc) {
Peter Collingbourne41f85462011-02-09 21:07:24 +00004003 FunctionDecl *ConfigDecl = Context.getcudaConfigureCallDecl();
4004 if (!ConfigDecl)
4005 return ExprError(Diag(LLLLoc, diag::err_undeclared_var_use)
4006 << "cudaConfigureCall");
4007 QualType ConfigQTy = ConfigDecl->getType();
4008
4009 DeclRefExpr *ConfigDR = new (Context) DeclRefExpr(
John McCall113bee02012-03-10 09:33:50 +00004010 ConfigDecl, false, ConfigQTy, VK_LValue, LLLLoc);
Eli Friedmanfa0df832012-02-02 03:46:19 +00004011 MarkFunctionReferenced(LLLLoc, ConfigDecl);
Peter Collingbourne41f85462011-02-09 21:07:24 +00004012
Peter Collingbourne619a8c72011-10-02 23:49:29 +00004013 return ActOnCallExpr(S, ConfigDR, LLLLoc, ExecConfig, GGGLoc, 0,
4014 /*IsExecConfig=*/true);
John McCall2d74de92009-12-01 22:10:20 +00004015}
4016
Tanya Lattner55808c12011-06-04 00:47:47 +00004017/// ActOnAsTypeExpr - create a new asType (bitcast) from the arguments.
4018///
4019/// __builtin_astype( value, dst type )
4020///
Richard Trieuba63ce62011-09-09 01:45:06 +00004021ExprResult Sema::ActOnAsTypeExpr(Expr *E, ParsedType ParsedDestTy,
Tanya Lattner55808c12011-06-04 00:47:47 +00004022 SourceLocation BuiltinLoc,
4023 SourceLocation RParenLoc) {
4024 ExprValueKind VK = VK_RValue;
4025 ExprObjectKind OK = OK_Ordinary;
Richard Trieuba63ce62011-09-09 01:45:06 +00004026 QualType DstTy = GetTypeFromParser(ParsedDestTy);
4027 QualType SrcTy = E->getType();
Tanya Lattner55808c12011-06-04 00:47:47 +00004028 if (Context.getTypeSize(DstTy) != Context.getTypeSize(SrcTy))
4029 return ExprError(Diag(BuiltinLoc,
4030 diag::err_invalid_astype_of_different_size)
Peter Collingbourne23f1bee2011-06-08 15:15:17 +00004031 << DstTy
4032 << SrcTy
Richard Trieuba63ce62011-09-09 01:45:06 +00004033 << E->getSourceRange());
4034 return Owned(new (Context) AsTypeExpr(E, DstTy, VK, OK, BuiltinLoc,
Richard Trieucfc491d2011-08-02 04:35:43 +00004035 RParenLoc));
Tanya Lattner55808c12011-06-04 00:47:47 +00004036}
4037
John McCall57500772009-12-16 12:17:52 +00004038/// BuildResolvedCallExpr - Build a call to a resolved expression,
4039/// i.e. an expression not of \p OverloadTy. The expression should
John McCall2d74de92009-12-01 22:10:20 +00004040/// unary-convert to an expression of function-pointer or
4041/// block-pointer type.
4042///
4043/// \param NDecl the declaration being called, if available
John McCalldadc5752010-08-24 06:29:42 +00004044ExprResult
John McCall2d74de92009-12-01 22:10:20 +00004045Sema::BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
4046 SourceLocation LParenLoc,
4047 Expr **Args, unsigned NumArgs,
Peter Collingbourne41f85462011-02-09 21:07:24 +00004048 SourceLocation RParenLoc,
Peter Collingbourne619a8c72011-10-02 23:49:29 +00004049 Expr *Config, bool IsExecConfig) {
John McCall2d74de92009-12-01 22:10:20 +00004050 FunctionDecl *FDecl = dyn_cast_or_null<FunctionDecl>(NDecl);
Eli Friedman34866c72012-08-31 00:14:07 +00004051 unsigned BuiltinID = (FDecl ? FDecl->getBuiltinID() : 0);
John McCall2d74de92009-12-01 22:10:20 +00004052
Chris Lattneraa9c7ae2008-04-08 04:40:51 +00004053 // Promote the function operand.
Eli Friedman34866c72012-08-31 00:14:07 +00004054 // We special-case function promotion here because we only allow promoting
4055 // builtin functions to function pointers in the callee of a call.
4056 ExprResult Result;
4057 if (BuiltinID &&
4058 Fn->getType()->isSpecificBuiltinType(BuiltinType::BuiltinFn)) {
4059 Result = ImpCastExprToType(Fn, Context.getPointerType(FDecl->getType()),
4060 CK_BuiltinFnToFnPtr).take();
4061 } else {
4062 Result = UsualUnaryConversions(Fn);
4063 }
John Wiegley01296292011-04-08 18:41:53 +00004064 if (Result.isInvalid())
4065 return ExprError();
4066 Fn = Result.take();
Chris Lattneraa9c7ae2008-04-08 04:40:51 +00004067
Chris Lattner08464942007-12-28 05:29:59 +00004068 // Make the call expr early, before semantic checks. This guarantees cleanup
4069 // of arguments and function on error.
Peter Collingbourne41f85462011-02-09 21:07:24 +00004070 CallExpr *TheCall;
Eric Christopher13586ab2012-05-30 01:14:28 +00004071 if (Config)
Peter Collingbourne41f85462011-02-09 21:07:24 +00004072 TheCall = new (Context) CUDAKernelCallExpr(Context, Fn,
4073 cast<CallExpr>(Config),
Benjamin Kramerc215e762012-08-24 11:54:20 +00004074 llvm::makeArrayRef(Args,NumArgs),
Peter Collingbourne41f85462011-02-09 21:07:24 +00004075 Context.BoolTy,
4076 VK_RValue,
4077 RParenLoc);
Eric Christopher13586ab2012-05-30 01:14:28 +00004078 else
Peter Collingbourne41f85462011-02-09 21:07:24 +00004079 TheCall = new (Context) CallExpr(Context, Fn,
Benjamin Kramerc215e762012-08-24 11:54:20 +00004080 llvm::makeArrayRef(Args, NumArgs),
Peter Collingbourne41f85462011-02-09 21:07:24 +00004081 Context.BoolTy,
4082 VK_RValue,
4083 RParenLoc);
Sebastian Redlc215cfc2009-01-19 00:08:26 +00004084
John McCallbebede42011-02-26 05:39:39 +00004085 // Bail out early if calling a builtin with custom typechecking.
4086 if (BuiltinID && Context.BuiltinInfo.hasCustomTypechecking(BuiltinID))
4087 return CheckBuiltinFunctionCall(BuiltinID, TheCall);
4088
John McCall31996342011-04-07 08:22:57 +00004089 retry:
Steve Naroff8de9c3a2008-09-05 22:11:13 +00004090 const FunctionType *FuncT;
John McCallbebede42011-02-26 05:39:39 +00004091 if (const PointerType *PT = Fn->getType()->getAs<PointerType>()) {
Steve Naroff8de9c3a2008-09-05 22:11:13 +00004092 // C99 6.5.2.2p1 - "The expression that denotes the called function shall
4093 // have type pointer to function".
John McCall9dd450b2009-09-21 23:43:11 +00004094 FuncT = PT->getPointeeType()->getAs<FunctionType>();
John McCallbebede42011-02-26 05:39:39 +00004095 if (FuncT == 0)
4096 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
4097 << Fn->getType() << Fn->getSourceRange());
4098 } else if (const BlockPointerType *BPT =
4099 Fn->getType()->getAs<BlockPointerType>()) {
4100 FuncT = BPT->getPointeeType()->castAs<FunctionType>();
4101 } else {
John McCall31996342011-04-07 08:22:57 +00004102 // Handle calls to expressions of unknown-any type.
4103 if (Fn->getType() == Context.UnknownAnyTy) {
John McCall2979fe02011-04-12 00:42:48 +00004104 ExprResult rewrite = rebuildUnknownAnyFunction(*this, Fn);
John McCall31996342011-04-07 08:22:57 +00004105 if (rewrite.isInvalid()) return ExprError();
4106 Fn = rewrite.take();
John McCall39439732011-04-09 22:50:59 +00004107 TheCall->setCallee(Fn);
John McCall31996342011-04-07 08:22:57 +00004108 goto retry;
4109 }
4110
Sebastian Redlc215cfc2009-01-19 00:08:26 +00004111 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
4112 << Fn->getType() << Fn->getSourceRange());
John McCallbebede42011-02-26 05:39:39 +00004113 }
Sebastian Redlc215cfc2009-01-19 00:08:26 +00004114
David Blaikiebbafb8a2012-03-11 07:00:24 +00004115 if (getLangOpts().CUDA) {
Peter Collingbourne4b66c472011-02-23 01:53:29 +00004116 if (Config) {
4117 // CUDA: Kernel calls must be to global functions
4118 if (FDecl && !FDecl->hasAttr<CUDAGlobalAttr>())
4119 return ExprError(Diag(LParenLoc,diag::err_kern_call_not_global_function)
4120 << FDecl->getName() << Fn->getSourceRange());
4121
4122 // CUDA: Kernel function must have 'void' return type
4123 if (!FuncT->getResultType()->isVoidType())
4124 return ExprError(Diag(LParenLoc, diag::err_kern_type_not_void_return)
4125 << Fn->getType() << Fn->getSourceRange());
Peter Collingbourne34a20b02011-10-02 23:49:15 +00004126 } else {
4127 // CUDA: Calls to global functions must be configured
4128 if (FDecl && FDecl->hasAttr<CUDAGlobalAttr>())
4129 return ExprError(Diag(LParenLoc, diag::err_global_call_not_config)
4130 << FDecl->getName() << Fn->getSourceRange());
Peter Collingbourne4b66c472011-02-23 01:53:29 +00004131 }
4132 }
4133
Eli Friedman3164fb12009-03-22 22:00:50 +00004134 // Check for a valid return type
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00004135 if (CheckCallReturnType(FuncT->getResultType(),
Daniel Dunbar62ee6412012-03-09 18:35:03 +00004136 Fn->getLocStart(), TheCall,
Anders Carlsson7f84ed92009-10-09 23:51:55 +00004137 FDecl))
Eli Friedman3164fb12009-03-22 22:00:50 +00004138 return ExprError();
4139
Chris Lattner08464942007-12-28 05:29:59 +00004140 // We know the result type of the call, set it.
Douglas Gregor603d81b2010-07-13 08:18:22 +00004141 TheCall->setType(FuncT->getCallResultType(Context));
John McCall7decc9e2010-11-18 06:31:45 +00004142 TheCall->setValueKind(Expr::getValueKindForType(FuncT->getResultType()));
Sebastian Redlc215cfc2009-01-19 00:08:26 +00004143
Richard Smith55ce3522012-06-25 20:30:08 +00004144 const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT);
4145 if (Proto) {
John McCallb268a282010-08-23 23:25:46 +00004146 if (ConvertArgumentsForCall(TheCall, Fn, FDecl, Proto, Args, NumArgs,
Peter Collingbourne619a8c72011-10-02 23:49:29 +00004147 RParenLoc, IsExecConfig))
Sebastian Redlc215cfc2009-01-19 00:08:26 +00004148 return ExprError();
Chris Lattner08464942007-12-28 05:29:59 +00004149 } else {
Douglas Gregordeaad8c2009-02-26 23:50:07 +00004150 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!");
Sebastian Redlc215cfc2009-01-19 00:08:26 +00004151
Douglas Gregord8e97de2009-04-02 15:37:10 +00004152 if (FDecl) {
4153 // Check if we have too few/too many template arguments, based
4154 // on our knowledge of the function definition.
4155 const FunctionDecl *Def = 0;
Argyrios Kyrtzidis36ea3222010-07-07 11:31:19 +00004156 if (FDecl->hasBody(Def) && NumArgs != Def->param_size()) {
Richard Smith55ce3522012-06-25 20:30:08 +00004157 Proto = Def->getType()->getAs<FunctionProtoType>();
Douglas Gregor8e09a722010-10-25 20:39:23 +00004158 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size()))
Eli Friedmanfcbf7d22009-06-01 09:24:59 +00004159 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments)
4160 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange();
Eli Friedmanfcbf7d22009-06-01 09:24:59 +00004161 }
Douglas Gregor8e09a722010-10-25 20:39:23 +00004162
4163 // If the function we're calling isn't a function prototype, but we have
4164 // a function prototype from a prior declaratiom, use that prototype.
4165 if (!FDecl->hasPrototype())
4166 Proto = FDecl->getType()->getAs<FunctionProtoType>();
Douglas Gregord8e97de2009-04-02 15:37:10 +00004167 }
4168
Steve Naroff0b661582007-08-28 23:30:39 +00004169 // Promote the arguments (C99 6.5.2.2p6).
Chris Lattner08464942007-12-28 05:29:59 +00004170 for (unsigned i = 0; i != NumArgs; i++) {
4171 Expr *Arg = Args[i];
Douglas Gregor8e09a722010-10-25 20:39:23 +00004172
4173 if (Proto && i < Proto->getNumArgs()) {
Douglas Gregor8e09a722010-10-25 20:39:23 +00004174 InitializedEntity Entity
4175 = InitializedEntity::InitializeParameter(Context,
John McCall31168b02011-06-15 23:02:42 +00004176 Proto->getArgType(i),
4177 Proto->isArgConsumed(i));
Douglas Gregor8e09a722010-10-25 20:39:23 +00004178 ExprResult ArgE = PerformCopyInitialization(Entity,
4179 SourceLocation(),
4180 Owned(Arg));
4181 if (ArgE.isInvalid())
4182 return true;
4183
4184 Arg = ArgE.takeAs<Expr>();
4185
4186 } else {
John Wiegley01296292011-04-08 18:41:53 +00004187 ExprResult ArgE = DefaultArgumentPromotion(Arg);
4188
4189 if (ArgE.isInvalid())
4190 return true;
4191
4192 Arg = ArgE.takeAs<Expr>();
Douglas Gregor8e09a722010-10-25 20:39:23 +00004193 }
4194
Daniel Dunbar62ee6412012-03-09 18:35:03 +00004195 if (RequireCompleteType(Arg->getLocStart(),
Douglas Gregor83025412010-10-26 05:45:40 +00004196 Arg->getType(),
Douglas Gregor7bfb2d02012-05-04 16:32:21 +00004197 diag::err_call_incomplete_argument, Arg))
Douglas Gregor83025412010-10-26 05:45:40 +00004198 return ExprError();
4199
Chris Lattner08464942007-12-28 05:29:59 +00004200 TheCall->setArg(i, Arg);
Steve Naroff0b661582007-08-28 23:30:39 +00004201 }
Steve Naroffae4143e2007-04-26 20:39:23 +00004202 }
Chris Lattner08464942007-12-28 05:29:59 +00004203
Douglas Gregor97fd6e22008-12-22 05:46:06 +00004204 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
4205 if (!Method->isStatic())
Sebastian Redlc215cfc2009-01-19 00:08:26 +00004206 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object)
4207 << Fn->getSourceRange());
Douglas Gregor97fd6e22008-12-22 05:46:06 +00004208
Fariborz Jahanian0aa5c452009-05-15 20:33:25 +00004209 // Check for sentinels
4210 if (NDecl)
4211 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs);
Mike Stump11289f42009-09-09 15:08:12 +00004212
Chris Lattnerb87b1b32007-08-10 20:18:51 +00004213 // Do special checking on direct calls to functions.
Anders Carlssonbc4c1072009-08-16 01:56:34 +00004214 if (FDecl) {
Richard Smith55ce3522012-06-25 20:30:08 +00004215 if (CheckFunctionCall(FDecl, TheCall, Proto))
Anders Carlssonbc4c1072009-08-16 01:56:34 +00004216 return ExprError();
Mike Stump11289f42009-09-09 15:08:12 +00004217
John McCallbebede42011-02-26 05:39:39 +00004218 if (BuiltinID)
Fariborz Jahaniane8473c22010-11-30 17:35:24 +00004219 return CheckBuiltinFunctionCall(BuiltinID, TheCall);
Anders Carlssonbc4c1072009-08-16 01:56:34 +00004220 } else if (NDecl) {
Richard Smith55ce3522012-06-25 20:30:08 +00004221 if (CheckBlockCall(NDecl, TheCall, Proto))
Anders Carlssonbc4c1072009-08-16 01:56:34 +00004222 return ExprError();
4223 }
Chris Lattnerb87b1b32007-08-10 20:18:51 +00004224
John McCallb268a282010-08-23 23:25:46 +00004225 return MaybeBindToTemporary(TheCall);
Chris Lattnere168f762006-11-10 05:29:30 +00004226}
4227
John McCalldadc5752010-08-24 06:29:42 +00004228ExprResult
John McCallba7bf592010-08-24 05:47:05 +00004229Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, ParsedType Ty,
John McCallb268a282010-08-23 23:25:46 +00004230 SourceLocation RParenLoc, Expr *InitExpr) {
Steve Naroff83895f72007-09-16 03:34:24 +00004231 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type");
Steve Naroff57eb2c52007-07-19 21:32:11 +00004232 // FIXME: put back this assert when initializers are worked out.
Steve Naroff83895f72007-09-16 03:34:24 +00004233 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression");
John McCalle15bbff2010-01-18 19:35:47 +00004234
4235 TypeSourceInfo *TInfo;
4236 QualType literalType = GetTypeFromParser(Ty, &TInfo);
4237 if (!TInfo)
4238 TInfo = Context.getTrivialTypeSourceInfo(literalType);
4239
John McCallb268a282010-08-23 23:25:46 +00004240 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, InitExpr);
John McCalle15bbff2010-01-18 19:35:47 +00004241}
4242
John McCalldadc5752010-08-24 06:29:42 +00004243ExprResult
John McCalle15bbff2010-01-18 19:35:47 +00004244Sema::BuildCompoundLiteralExpr(SourceLocation LParenLoc, TypeSourceInfo *TInfo,
Richard Trieuba63ce62011-09-09 01:45:06 +00004245 SourceLocation RParenLoc, Expr *LiteralExpr) {
John McCalle15bbff2010-01-18 19:35:47 +00004246 QualType literalType = TInfo->getType();
Anders Carlsson2c1ec6d2007-12-05 07:24:19 +00004247
Eli Friedman37a186d2008-05-20 05:22:08 +00004248 if (literalType->isArrayType()) {
Argyrios Kyrtzidis85663562010-11-08 19:14:19 +00004249 if (RequireCompleteType(LParenLoc, Context.getBaseElementType(literalType),
Douglas Gregor7bfb2d02012-05-04 16:32:21 +00004250 diag::err_illegal_decl_array_incomplete_type,
4251 SourceRange(LParenLoc,
4252 LiteralExpr->getSourceRange().getEnd())))
Argyrios Kyrtzidis85663562010-11-08 19:14:19 +00004253 return ExprError();
Chris Lattner7adf0762008-08-04 07:31:14 +00004254 if (literalType->isVariableArrayType())
Sebastian Redlb5d49352009-01-19 22:31:54 +00004255 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init)
Richard Trieuba63ce62011-09-09 01:45:06 +00004256 << SourceRange(LParenLoc, LiteralExpr->getSourceRange().getEnd()));
Douglas Gregor1c37d9e2009-05-21 23:48:18 +00004257 } else if (!literalType->isDependentType() &&
4258 RequireCompleteType(LParenLoc, literalType,
Douglas Gregor7bfb2d02012-05-04 16:32:21 +00004259 diag::err_typecheck_decl_incomplete_type,
4260 SourceRange(LParenLoc, LiteralExpr->getSourceRange().getEnd())))
Sebastian Redlb5d49352009-01-19 22:31:54 +00004261 return ExprError();
Eli Friedman37a186d2008-05-20 05:22:08 +00004262
Douglas Gregor85dabae2009-12-16 01:38:02 +00004263 InitializedEntity Entity
Douglas Gregor1b303932009-12-22 15:35:07 +00004264 = InitializedEntity::InitializeTemporary(literalType);
Douglas Gregor85dabae2009-12-16 01:38:02 +00004265 InitializationKind Kind
John McCall31168b02011-06-15 23:02:42 +00004266 = InitializationKind::CreateCStyleCast(LParenLoc,
Sebastian Redl0501c632012-02-12 16:37:36 +00004267 SourceRange(LParenLoc, RParenLoc),
4268 /*InitList=*/true);
Richard Trieuba63ce62011-09-09 01:45:06 +00004269 InitializationSequence InitSeq(*this, Entity, Kind, &LiteralExpr, 1);
Benjamin Kramercc4c49d2012-08-23 23:38:35 +00004270 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, LiteralExpr,
4271 &literalType);
Eli Friedmana553d4a2009-12-22 02:35:53 +00004272 if (Result.isInvalid())
Sebastian Redlb5d49352009-01-19 22:31:54 +00004273 return ExprError();
Richard Trieuba63ce62011-09-09 01:45:06 +00004274 LiteralExpr = Result.get();
Steve Naroffd32419d2008-01-14 18:19:28 +00004275
Chris Lattner79413952008-12-04 23:50:19 +00004276 bool isFileScope = getCurFunctionOrMethodDecl() == 0;
Steve Naroffd32419d2008-01-14 18:19:28 +00004277 if (isFileScope) { // 6.5.2.5p3
Richard Trieuba63ce62011-09-09 01:45:06 +00004278 if (CheckForConstantInitializer(LiteralExpr, literalType))
Sebastian Redlb5d49352009-01-19 22:31:54 +00004279 return ExprError();
Steve Naroff98f72032008-01-10 22:15:12 +00004280 }
Eli Friedmana553d4a2009-12-22 02:35:53 +00004281
John McCall7decc9e2010-11-18 06:31:45 +00004282 // In C, compound literals are l-values for some reason.
David Blaikiebbafb8a2012-03-11 07:00:24 +00004283 ExprValueKind VK = getLangOpts().CPlusPlus ? VK_RValue : VK_LValue;
John McCall7decc9e2010-11-18 06:31:45 +00004284
Douglas Gregor9b71f0c2011-06-17 04:59:12 +00004285 return MaybeBindToTemporary(
4286 new (Context) CompoundLiteralExpr(LParenLoc, TInfo, literalType,
Richard Trieuba63ce62011-09-09 01:45:06 +00004287 VK, LiteralExpr, isFileScope));
Steve Narofffbd09832007-07-19 01:06:55 +00004288}
4289
John McCalldadc5752010-08-24 06:29:42 +00004290ExprResult
Richard Trieuba63ce62011-09-09 01:45:06 +00004291Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg InitArgList,
Sebastian Redlb5d49352009-01-19 22:31:54 +00004292 SourceLocation RBraceLoc) {
John McCall526ab472011-10-25 17:37:35 +00004293 // Immediately handle non-overload placeholders. Overloads can be
4294 // resolved contextually, but everything else here can't.
Benjamin Kramerc215e762012-08-24 11:54:20 +00004295 for (unsigned I = 0, E = InitArgList.size(); I != E; ++I) {
4296 if (InitArgList[I]->getType()->isNonOverloadPlaceholderType()) {
4297 ExprResult result = CheckPlaceholderExpr(InitArgList[I]);
John McCall526ab472011-10-25 17:37:35 +00004298
4299 // Ignore failures; dropping the entire initializer list because
4300 // of one failure would be terrible for indexing/etc.
4301 if (result.isInvalid()) continue;
4302
Benjamin Kramerc215e762012-08-24 11:54:20 +00004303 InitArgList[I] = result.take();
John McCall526ab472011-10-25 17:37:35 +00004304 }
4305 }
4306
Steve Naroff30d242c2007-09-15 18:49:24 +00004307 // Semantic analysis for initializers is done by ActOnDeclarator() and
Mike Stump4e1f26a2009-02-19 03:04:26 +00004308 // CheckInitializer() - it requires knowledge of the object being intialized.
Sebastian Redlb5d49352009-01-19 22:31:54 +00004309
Benjamin Kramerc215e762012-08-24 11:54:20 +00004310 InitListExpr *E = new (Context) InitListExpr(Context, LBraceLoc, InitArgList,
4311 RBraceLoc);
Chris Lattner24d5bfe2008-04-02 04:24:33 +00004312 E->setType(Context.VoidTy); // FIXME: just a place holder for now.
Sebastian Redlb5d49352009-01-19 22:31:54 +00004313 return Owned(E);
Steve Narofffbd09832007-07-19 01:06:55 +00004314}
4315
John McCallcd78e802011-09-10 01:16:55 +00004316/// Do an explicit extend of the given block pointer if we're in ARC.
4317static void maybeExtendBlockObject(Sema &S, ExprResult &E) {
4318 assert(E.get()->getType()->isBlockPointerType());
4319 assert(E.get()->isRValue());
4320
4321 // Only do this in an r-value context.
David Blaikiebbafb8a2012-03-11 07:00:24 +00004322 if (!S.getLangOpts().ObjCAutoRefCount) return;
John McCallcd78e802011-09-10 01:16:55 +00004323
4324 E = ImplicitCastExpr::Create(S.Context, E.get()->getType(),
John McCall2d637d22011-09-10 06:18:15 +00004325 CK_ARCExtendBlockObject, E.get(),
John McCallcd78e802011-09-10 01:16:55 +00004326 /*base path*/ 0, VK_RValue);
4327 S.ExprNeedsCleanups = true;
4328}
4329
4330/// Prepare a conversion of the given expression to an ObjC object
4331/// pointer type.
4332CastKind Sema::PrepareCastToObjCObjectPointer(ExprResult &E) {
4333 QualType type = E.get()->getType();
4334 if (type->isObjCObjectPointerType()) {
4335 return CK_BitCast;
4336 } else if (type->isBlockPointerType()) {
4337 maybeExtendBlockObject(*this, E);
4338 return CK_BlockPointerToObjCPointerCast;
4339 } else {
4340 assert(type->isPointerType());
4341 return CK_CPointerToObjCPointerCast;
4342 }
4343}
4344
John McCalld7646252010-11-14 08:17:51 +00004345/// Prepares for a scalar cast, performing all the necessary stages
4346/// except the final cast and returning the kind required.
John McCall9776e432011-10-06 23:25:11 +00004347CastKind Sema::PrepareScalarCast(ExprResult &Src, QualType DestTy) {
John McCalld7646252010-11-14 08:17:51 +00004348 // Both Src and Dest are scalar types, i.e. arithmetic or pointer.
4349 // Also, callers should have filtered out the invalid cases with
4350 // pointers. Everything else should be possible.
4351
John Wiegley01296292011-04-08 18:41:53 +00004352 QualType SrcTy = Src.get()->getType();
John McCall9776e432011-10-06 23:25:11 +00004353 if (Context.hasSameUnqualifiedType(SrcTy, DestTy))
John McCalle3027922010-08-25 11:45:40 +00004354 return CK_NoOp;
Anders Carlsson094c4592009-10-18 18:12:03 +00004355
John McCall9320b872011-09-09 05:25:32 +00004356 switch (Type::ScalarTypeKind SrcKind = SrcTy->getScalarTypeKind()) {
John McCall8cb679e2010-11-15 09:13:47 +00004357 case Type::STK_MemberPointer:
4358 llvm_unreachable("member pointer type in C");
Abramo Bagnaraba854972011-01-04 09:50:03 +00004359
John McCall9320b872011-09-09 05:25:32 +00004360 case Type::STK_CPointer:
4361 case Type::STK_BlockPointer:
4362 case Type::STK_ObjCObjectPointer:
John McCall8cb679e2010-11-15 09:13:47 +00004363 switch (DestTy->getScalarTypeKind()) {
John McCall9320b872011-09-09 05:25:32 +00004364 case Type::STK_CPointer:
4365 return CK_BitCast;
4366 case Type::STK_BlockPointer:
4367 return (SrcKind == Type::STK_BlockPointer
4368 ? CK_BitCast : CK_AnyPointerToBlockPointerCast);
4369 case Type::STK_ObjCObjectPointer:
4370 if (SrcKind == Type::STK_ObjCObjectPointer)
4371 return CK_BitCast;
David Blaikie8a40f702012-01-17 06:56:22 +00004372 if (SrcKind == Type::STK_CPointer)
John McCall9320b872011-09-09 05:25:32 +00004373 return CK_CPointerToObjCPointerCast;
David Blaikie8a40f702012-01-17 06:56:22 +00004374 maybeExtendBlockObject(*this, Src);
4375 return CK_BlockPointerToObjCPointerCast;
John McCall8cb679e2010-11-15 09:13:47 +00004376 case Type::STK_Bool:
4377 return CK_PointerToBoolean;
4378 case Type::STK_Integral:
4379 return CK_PointerToIntegral;
4380 case Type::STK_Floating:
4381 case Type::STK_FloatingComplex:
4382 case Type::STK_IntegralComplex:
4383 case Type::STK_MemberPointer:
4384 llvm_unreachable("illegal cast from pointer");
4385 }
David Blaikie8a40f702012-01-17 06:56:22 +00004386 llvm_unreachable("Should have returned before this");
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00004387
John McCall8cb679e2010-11-15 09:13:47 +00004388 case Type::STK_Bool: // casting from bool is like casting from an integer
4389 case Type::STK_Integral:
4390 switch (DestTy->getScalarTypeKind()) {
John McCall9320b872011-09-09 05:25:32 +00004391 case Type::STK_CPointer:
4392 case Type::STK_ObjCObjectPointer:
4393 case Type::STK_BlockPointer:
John McCall9776e432011-10-06 23:25:11 +00004394 if (Src.get()->isNullPointerConstant(Context,
Richard Trieucfc491d2011-08-02 04:35:43 +00004395 Expr::NPC_ValueDependentIsNull))
John McCalle84af4e2010-11-13 01:35:44 +00004396 return CK_NullToPointer;
John McCalle3027922010-08-25 11:45:40 +00004397 return CK_IntegralToPointer;
John McCall8cb679e2010-11-15 09:13:47 +00004398 case Type::STK_Bool:
4399 return CK_IntegralToBoolean;
4400 case Type::STK_Integral:
John McCalld7646252010-11-14 08:17:51 +00004401 return CK_IntegralCast;
John McCall8cb679e2010-11-15 09:13:47 +00004402 case Type::STK_Floating:
John McCalle3027922010-08-25 11:45:40 +00004403 return CK_IntegralToFloating;
John McCall8cb679e2010-11-15 09:13:47 +00004404 case Type::STK_IntegralComplex:
John McCall9776e432011-10-06 23:25:11 +00004405 Src = ImpCastExprToType(Src.take(),
4406 DestTy->castAs<ComplexType>()->getElementType(),
4407 CK_IntegralCast);
John McCalld7646252010-11-14 08:17:51 +00004408 return CK_IntegralRealToComplex;
John McCall8cb679e2010-11-15 09:13:47 +00004409 case Type::STK_FloatingComplex:
John McCall9776e432011-10-06 23:25:11 +00004410 Src = ImpCastExprToType(Src.take(),
4411 DestTy->castAs<ComplexType>()->getElementType(),
4412 CK_IntegralToFloating);
John McCalld7646252010-11-14 08:17:51 +00004413 return CK_FloatingRealToComplex;
John McCall8cb679e2010-11-15 09:13:47 +00004414 case Type::STK_MemberPointer:
4415 llvm_unreachable("member pointer type in C");
John McCalld7646252010-11-14 08:17:51 +00004416 }
David Blaikie8a40f702012-01-17 06:56:22 +00004417 llvm_unreachable("Should have returned before this");
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00004418
John McCall8cb679e2010-11-15 09:13:47 +00004419 case Type::STK_Floating:
4420 switch (DestTy->getScalarTypeKind()) {
4421 case Type::STK_Floating:
John McCalle3027922010-08-25 11:45:40 +00004422 return CK_FloatingCast;
John McCall8cb679e2010-11-15 09:13:47 +00004423 case Type::STK_Bool:
4424 return CK_FloatingToBoolean;
4425 case Type::STK_Integral:
John McCalle3027922010-08-25 11:45:40 +00004426 return CK_FloatingToIntegral;
John McCall8cb679e2010-11-15 09:13:47 +00004427 case Type::STK_FloatingComplex:
John McCall9776e432011-10-06 23:25:11 +00004428 Src = ImpCastExprToType(Src.take(),
4429 DestTy->castAs<ComplexType>()->getElementType(),
4430 CK_FloatingCast);
John McCalld7646252010-11-14 08:17:51 +00004431 return CK_FloatingRealToComplex;
John McCall8cb679e2010-11-15 09:13:47 +00004432 case Type::STK_IntegralComplex:
John McCall9776e432011-10-06 23:25:11 +00004433 Src = ImpCastExprToType(Src.take(),
4434 DestTy->castAs<ComplexType>()->getElementType(),
4435 CK_FloatingToIntegral);
John McCalld7646252010-11-14 08:17:51 +00004436 return CK_IntegralRealToComplex;
John McCall9320b872011-09-09 05:25:32 +00004437 case Type::STK_CPointer:
4438 case Type::STK_ObjCObjectPointer:
4439 case Type::STK_BlockPointer:
John McCall8cb679e2010-11-15 09:13:47 +00004440 llvm_unreachable("valid float->pointer cast?");
4441 case Type::STK_MemberPointer:
4442 llvm_unreachable("member pointer type in C");
John McCalld7646252010-11-14 08:17:51 +00004443 }
David Blaikie8a40f702012-01-17 06:56:22 +00004444 llvm_unreachable("Should have returned before this");
John McCalld7646252010-11-14 08:17:51 +00004445
John McCall8cb679e2010-11-15 09:13:47 +00004446 case Type::STK_FloatingComplex:
4447 switch (DestTy->getScalarTypeKind()) {
4448 case Type::STK_FloatingComplex:
John McCalld7646252010-11-14 08:17:51 +00004449 return CK_FloatingComplexCast;
John McCall8cb679e2010-11-15 09:13:47 +00004450 case Type::STK_IntegralComplex:
John McCalld7646252010-11-14 08:17:51 +00004451 return CK_FloatingComplexToIntegralComplex;
John McCallfcef3cf2010-12-14 17:51:41 +00004452 case Type::STK_Floating: {
John McCall9776e432011-10-06 23:25:11 +00004453 QualType ET = SrcTy->castAs<ComplexType>()->getElementType();
4454 if (Context.hasSameType(ET, DestTy))
John McCallfcef3cf2010-12-14 17:51:41 +00004455 return CK_FloatingComplexToReal;
John McCall9776e432011-10-06 23:25:11 +00004456 Src = ImpCastExprToType(Src.take(), ET, CK_FloatingComplexToReal);
John McCallfcef3cf2010-12-14 17:51:41 +00004457 return CK_FloatingCast;
4458 }
John McCall8cb679e2010-11-15 09:13:47 +00004459 case Type::STK_Bool:
John McCalld7646252010-11-14 08:17:51 +00004460 return CK_FloatingComplexToBoolean;
John McCall8cb679e2010-11-15 09:13:47 +00004461 case Type::STK_Integral:
John McCall9776e432011-10-06 23:25:11 +00004462 Src = ImpCastExprToType(Src.take(),
4463 SrcTy->castAs<ComplexType>()->getElementType(),
4464 CK_FloatingComplexToReal);
John McCalld7646252010-11-14 08:17:51 +00004465 return CK_FloatingToIntegral;
John McCall9320b872011-09-09 05:25:32 +00004466 case Type::STK_CPointer:
4467 case Type::STK_ObjCObjectPointer:
4468 case Type::STK_BlockPointer:
John McCall8cb679e2010-11-15 09:13:47 +00004469 llvm_unreachable("valid complex float->pointer cast?");
4470 case Type::STK_MemberPointer:
4471 llvm_unreachable("member pointer type in C");
John McCalld7646252010-11-14 08:17:51 +00004472 }
David Blaikie8a40f702012-01-17 06:56:22 +00004473 llvm_unreachable("Should have returned before this");
John McCalld7646252010-11-14 08:17:51 +00004474
John McCall8cb679e2010-11-15 09:13:47 +00004475 case Type::STK_IntegralComplex:
4476 switch (DestTy->getScalarTypeKind()) {
4477 case Type::STK_FloatingComplex:
John McCalld7646252010-11-14 08:17:51 +00004478 return CK_IntegralComplexToFloatingComplex;
John McCall8cb679e2010-11-15 09:13:47 +00004479 case Type::STK_IntegralComplex:
John McCalld7646252010-11-14 08:17:51 +00004480 return CK_IntegralComplexCast;
John McCallfcef3cf2010-12-14 17:51:41 +00004481 case Type::STK_Integral: {
John McCall9776e432011-10-06 23:25:11 +00004482 QualType ET = SrcTy->castAs<ComplexType>()->getElementType();
4483 if (Context.hasSameType(ET, DestTy))
John McCallfcef3cf2010-12-14 17:51:41 +00004484 return CK_IntegralComplexToReal;
John McCall9776e432011-10-06 23:25:11 +00004485 Src = ImpCastExprToType(Src.take(), ET, CK_IntegralComplexToReal);
John McCallfcef3cf2010-12-14 17:51:41 +00004486 return CK_IntegralCast;
4487 }
John McCall8cb679e2010-11-15 09:13:47 +00004488 case Type::STK_Bool:
John McCalld7646252010-11-14 08:17:51 +00004489 return CK_IntegralComplexToBoolean;
John McCall8cb679e2010-11-15 09:13:47 +00004490 case Type::STK_Floating:
John McCall9776e432011-10-06 23:25:11 +00004491 Src = ImpCastExprToType(Src.take(),
4492 SrcTy->castAs<ComplexType>()->getElementType(),
4493 CK_IntegralComplexToReal);
John McCalld7646252010-11-14 08:17:51 +00004494 return CK_IntegralToFloating;
John McCall9320b872011-09-09 05:25:32 +00004495 case Type::STK_CPointer:
4496 case Type::STK_ObjCObjectPointer:
4497 case Type::STK_BlockPointer:
John McCall8cb679e2010-11-15 09:13:47 +00004498 llvm_unreachable("valid complex int->pointer cast?");
4499 case Type::STK_MemberPointer:
4500 llvm_unreachable("member pointer type in C");
John McCalld7646252010-11-14 08:17:51 +00004501 }
David Blaikie8a40f702012-01-17 06:56:22 +00004502 llvm_unreachable("Should have returned before this");
Anders Carlsson094c4592009-10-18 18:12:03 +00004503 }
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00004504
John McCalld7646252010-11-14 08:17:51 +00004505 llvm_unreachable("Unhandled scalar cast");
Anders Carlsson094c4592009-10-18 18:12:03 +00004506}
4507
Anders Carlsson525b76b2009-10-16 02:48:28 +00004508bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty,
John McCalle3027922010-08-25 11:45:40 +00004509 CastKind &Kind) {
Anders Carlssonde71adf2007-11-27 05:51:55 +00004510 assert(VectorTy->isVectorType() && "Not a vector type!");
Mike Stump4e1f26a2009-02-19 03:04:26 +00004511
Anders Carlssonde71adf2007-11-27 05:51:55 +00004512 if (Ty->isVectorType() || Ty->isIntegerType()) {
Chris Lattner37e05872008-03-05 18:54:05 +00004513 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty))
Anders Carlssonde71adf2007-11-27 05:51:55 +00004514 return Diag(R.getBegin(),
Mike Stump4e1f26a2009-02-19 03:04:26 +00004515 Ty->isVectorType() ?
Anders Carlssonde71adf2007-11-27 05:51:55 +00004516 diag::err_invalid_conversion_between_vectors :
Chris Lattner3b054132008-11-19 05:08:23 +00004517 diag::err_invalid_conversion_between_vector_and_integer)
Chris Lattner1e5665e2008-11-24 06:25:27 +00004518 << VectorTy << Ty << R;
Anders Carlssonde71adf2007-11-27 05:51:55 +00004519 } else
4520 return Diag(R.getBegin(),
Chris Lattner3b054132008-11-19 05:08:23 +00004521 diag::err_invalid_conversion_between_vector_and_scalar)
Chris Lattner1e5665e2008-11-24 06:25:27 +00004522 << VectorTy << Ty << R;
Mike Stump4e1f26a2009-02-19 03:04:26 +00004523
John McCalle3027922010-08-25 11:45:40 +00004524 Kind = CK_BitCast;
Anders Carlssonde71adf2007-11-27 05:51:55 +00004525 return false;
4526}
4527
John Wiegley01296292011-04-08 18:41:53 +00004528ExprResult Sema::CheckExtVectorCast(SourceRange R, QualType DestTy,
4529 Expr *CastExpr, CastKind &Kind) {
Nate Begemanc69b7402009-06-26 00:50:28 +00004530 assert(DestTy->isExtVectorType() && "Not an extended vector type!");
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00004531
Anders Carlsson43d70f82009-10-16 05:23:41 +00004532 QualType SrcTy = CastExpr->getType();
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00004533
Nate Begemanc8961a42009-06-27 22:05:55 +00004534 // If SrcTy is a VectorType, the total size must match to explicitly cast to
4535 // an ExtVectorType.
Tobias Grosser766bcc22011-09-22 13:03:14 +00004536 // In OpenCL, casts between vectors of different types are not allowed.
4537 // (See OpenCL 6.2).
Nate Begemanc69b7402009-06-26 00:50:28 +00004538 if (SrcTy->isVectorType()) {
Tobias Grosser766bcc22011-09-22 13:03:14 +00004539 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)
David Blaikiebbafb8a2012-03-11 07:00:24 +00004540 || (getLangOpts().OpenCL &&
Tobias Grosser766bcc22011-09-22 13:03:14 +00004541 (DestTy.getCanonicalType() != SrcTy.getCanonicalType()))) {
John Wiegley01296292011-04-08 18:41:53 +00004542 Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors)
Nate Begemanc69b7402009-06-26 00:50:28 +00004543 << DestTy << SrcTy << R;
John Wiegley01296292011-04-08 18:41:53 +00004544 return ExprError();
4545 }
John McCalle3027922010-08-25 11:45:40 +00004546 Kind = CK_BitCast;
John Wiegley01296292011-04-08 18:41:53 +00004547 return Owned(CastExpr);
Nate Begemanc69b7402009-06-26 00:50:28 +00004548 }
4549
Nate Begemanbd956c42009-06-28 02:36:38 +00004550 // All non-pointer scalars can be cast to ExtVector type. The appropriate
Nate Begemanc69b7402009-06-26 00:50:28 +00004551 // conversion will take place first from scalar to elt type, and then
4552 // splat from elt type to vector.
Nate Begemanbd956c42009-06-28 02:36:38 +00004553 if (SrcTy->isPointerType())
4554 return Diag(R.getBegin(),
4555 diag::err_invalid_conversion_between_vector_and_scalar)
4556 << DestTy << SrcTy << R;
Eli Friedman06ed2a52009-10-20 08:27:19 +00004557
4558 QualType DestElemTy = DestTy->getAs<ExtVectorType>()->getElementType();
John Wiegley01296292011-04-08 18:41:53 +00004559 ExprResult CastExprRes = Owned(CastExpr);
John McCall9776e432011-10-06 23:25:11 +00004560 CastKind CK = PrepareScalarCast(CastExprRes, DestElemTy);
John Wiegley01296292011-04-08 18:41:53 +00004561 if (CastExprRes.isInvalid())
4562 return ExprError();
4563 CastExpr = ImpCastExprToType(CastExprRes.take(), DestElemTy, CK).take();
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00004564
John McCalle3027922010-08-25 11:45:40 +00004565 Kind = CK_VectorSplat;
John Wiegley01296292011-04-08 18:41:53 +00004566 return Owned(CastExpr);
Nate Begemanc69b7402009-06-26 00:50:28 +00004567}
4568
John McCalldadc5752010-08-24 06:29:42 +00004569ExprResult
Argyrios Kyrtzidis7192a3b2011-07-01 22:22:59 +00004570Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc,
4571 Declarator &D, ParsedType &Ty,
Richard Trieuba63ce62011-09-09 01:45:06 +00004572 SourceLocation RParenLoc, Expr *CastExpr) {
4573 assert(!D.isInvalidType() && (CastExpr != 0) &&
Sebastian Redlb5d49352009-01-19 22:31:54 +00004574 "ActOnCastExpr(): missing type or expr");
Steve Naroff1a2cf6b2007-07-16 23:25:18 +00004575
Richard Trieuba63ce62011-09-09 01:45:06 +00004576 TypeSourceInfo *castTInfo = GetTypeForDeclaratorCast(D, CastExpr->getType());
Argyrios Kyrtzidis7192a3b2011-07-01 22:22:59 +00004577 if (D.isInvalidType())
4578 return ExprError();
4579
David Blaikiebbafb8a2012-03-11 07:00:24 +00004580 if (getLangOpts().CPlusPlus) {
Argyrios Kyrtzidis7192a3b2011-07-01 22:22:59 +00004581 // Check that there are no default arguments (C++ only).
4582 CheckExtraCXXDefaultArguments(D);
4583 }
4584
John McCall42856de2011-10-01 05:17:03 +00004585 checkUnusedDeclAttributes(D);
4586
Argyrios Kyrtzidis7192a3b2011-07-01 22:22:59 +00004587 QualType castType = castTInfo->getType();
4588 Ty = CreateParsedType(castType, castTInfo);
Mike Stump11289f42009-09-09 15:08:12 +00004589
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004590 bool isVectorLiteral = false;
4591
4592 // Check for an altivec or OpenCL literal,
4593 // i.e. all the elements are integer constants.
Richard Trieuba63ce62011-09-09 01:45:06 +00004594 ParenExpr *PE = dyn_cast<ParenExpr>(CastExpr);
4595 ParenListExpr *PLE = dyn_cast<ParenListExpr>(CastExpr);
David Blaikiebbafb8a2012-03-11 07:00:24 +00004596 if ((getLangOpts().AltiVec || getLangOpts().OpenCL)
Tobias Grosser0a3a22f2011-09-21 18:28:29 +00004597 && castType->isVectorType() && (PE || PLE)) {
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004598 if (PLE && PLE->getNumExprs() == 0) {
4599 Diag(PLE->getExprLoc(), diag::err_altivec_empty_initializer);
4600 return ExprError();
4601 }
4602 if (PE || PLE->getNumExprs() == 1) {
4603 Expr *E = (PE ? PE->getSubExpr() : PLE->getExpr(0));
4604 if (!E->getType()->isVectorType())
4605 isVectorLiteral = true;
4606 }
4607 else
4608 isVectorLiteral = true;
4609 }
4610
4611 // If this is a vector initializer, '(' type ')' '(' init, ..., init ')'
4612 // then handle it as such.
4613 if (isVectorLiteral)
Richard Trieuba63ce62011-09-09 01:45:06 +00004614 return BuildVectorLiteral(LParenLoc, RParenLoc, CastExpr, castTInfo);
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004615
Nate Begeman5ec4b312009-08-10 23:49:36 +00004616 // If the Expr being casted is a ParenListExpr, handle it specially.
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004617 // This is not an AltiVec-style cast, so turn the ParenListExpr into a
4618 // sequence of BinOp comma operators.
Richard Trieuba63ce62011-09-09 01:45:06 +00004619 if (isa<ParenListExpr>(CastExpr)) {
4620 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, CastExpr);
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004621 if (Result.isInvalid()) return ExprError();
Richard Trieuba63ce62011-09-09 01:45:06 +00004622 CastExpr = Result.take();
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004623 }
John McCallebe54742010-01-15 18:56:44 +00004624
Richard Trieuba63ce62011-09-09 01:45:06 +00004625 return BuildCStyleCastExpr(LParenLoc, castTInfo, RParenLoc, CastExpr);
John McCallebe54742010-01-15 18:56:44 +00004626}
4627
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004628ExprResult Sema::BuildVectorLiteral(SourceLocation LParenLoc,
4629 SourceLocation RParenLoc, Expr *E,
4630 TypeSourceInfo *TInfo) {
4631 assert((isa<ParenListExpr>(E) || isa<ParenExpr>(E)) &&
4632 "Expected paren or paren list expression");
4633
4634 Expr **exprs;
4635 unsigned numExprs;
4636 Expr *subExpr;
Richard Smith9ca91012013-02-05 05:55:57 +00004637 SourceLocation LiteralLParenLoc, LiteralRParenLoc;
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004638 if (ParenListExpr *PE = dyn_cast<ParenListExpr>(E)) {
Richard Smith9ca91012013-02-05 05:55:57 +00004639 LiteralLParenLoc = PE->getLParenLoc();
4640 LiteralRParenLoc = PE->getRParenLoc();
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004641 exprs = PE->getExprs();
4642 numExprs = PE->getNumExprs();
Richard Smith9ca91012013-02-05 05:55:57 +00004643 } else { // isa<ParenExpr> by assertion at function entrance
4644 LiteralLParenLoc = cast<ParenExpr>(E)->getLParen();
4645 LiteralRParenLoc = cast<ParenExpr>(E)->getRParen();
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004646 subExpr = cast<ParenExpr>(E)->getSubExpr();
4647 exprs = &subExpr;
4648 numExprs = 1;
4649 }
4650
4651 QualType Ty = TInfo->getType();
4652 assert(Ty->isVectorType() && "Expected vector type");
4653
Chris Lattner0e62c1c2011-07-23 10:55:15 +00004654 SmallVector<Expr *, 8> initExprs;
Tanya Lattner83559382011-07-15 23:07:01 +00004655 const VectorType *VTy = Ty->getAs<VectorType>();
4656 unsigned numElems = Ty->getAs<VectorType>()->getNumElements();
4657
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004658 // '(...)' form of vector initialization in AltiVec: the number of
4659 // initializers must be one or must match the size of the vector.
4660 // If a single value is specified in the initializer then it will be
4661 // replicated to all the components of the vector
Tanya Lattner83559382011-07-15 23:07:01 +00004662 if (VTy->getVectorKind() == VectorType::AltiVecVector) {
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004663 // The number of initializers must be one or must match the size of the
4664 // vector. If a single value is specified in the initializer then it will
4665 // be replicated to all the components of the vector
4666 if (numExprs == 1) {
4667 QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
Richard Smith01ebacd2011-10-27 23:31:58 +00004668 ExprResult Literal = DefaultLvalueConversion(exprs[0]);
4669 if (Literal.isInvalid())
4670 return ExprError();
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004671 Literal = ImpCastExprToType(Literal.take(), ElemTy,
John McCall9776e432011-10-06 23:25:11 +00004672 PrepareScalarCast(Literal, ElemTy));
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004673 return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.take());
4674 }
4675 else if (numExprs < numElems) {
4676 Diag(E->getExprLoc(),
4677 diag::err_incorrect_number_of_vector_initializers);
4678 return ExprError();
4679 }
4680 else
Benjamin Kramer8001f742012-02-14 12:06:21 +00004681 initExprs.append(exprs, exprs + numExprs);
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004682 }
Tanya Lattner83559382011-07-15 23:07:01 +00004683 else {
4684 // For OpenCL, when the number of initializers is a single value,
4685 // it will be replicated to all components of the vector.
David Blaikiebbafb8a2012-03-11 07:00:24 +00004686 if (getLangOpts().OpenCL &&
Tanya Lattner83559382011-07-15 23:07:01 +00004687 VTy->getVectorKind() == VectorType::GenericVector &&
4688 numExprs == 1) {
4689 QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
Richard Smith01ebacd2011-10-27 23:31:58 +00004690 ExprResult Literal = DefaultLvalueConversion(exprs[0]);
4691 if (Literal.isInvalid())
4692 return ExprError();
Tanya Lattner83559382011-07-15 23:07:01 +00004693 Literal = ImpCastExprToType(Literal.take(), ElemTy,
John McCall9776e432011-10-06 23:25:11 +00004694 PrepareScalarCast(Literal, ElemTy));
Tanya Lattner83559382011-07-15 23:07:01 +00004695 return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.take());
4696 }
4697
Benjamin Kramer8001f742012-02-14 12:06:21 +00004698 initExprs.append(exprs, exprs + numExprs);
Tanya Lattner83559382011-07-15 23:07:01 +00004699 }
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004700 // FIXME: This means that pretty-printing the final AST will produce curly
4701 // braces instead of the original commas.
Richard Smith9ca91012013-02-05 05:55:57 +00004702 InitListExpr *initE = new (Context) InitListExpr(Context, LiteralLParenLoc,
4703 initExprs, LiteralRParenLoc);
Argyrios Kyrtzidisd8701b62011-07-01 22:22:54 +00004704 initE->setType(Ty);
4705 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, initE);
4706}
4707
Sebastian Redla9351792012-02-11 23:51:47 +00004708/// This is not an AltiVec-style cast or or C++ direct-initialization, so turn
4709/// the ParenListExpr into a sequence of comma binary operators.
John McCalldadc5752010-08-24 06:29:42 +00004710ExprResult
Richard Trieuba63ce62011-09-09 01:45:06 +00004711Sema::MaybeConvertParenListExprToParenExpr(Scope *S, Expr *OrigExpr) {
4712 ParenListExpr *E = dyn_cast<ParenListExpr>(OrigExpr);
Nate Begeman5ec4b312009-08-10 23:49:36 +00004713 if (!E)
Richard Trieuba63ce62011-09-09 01:45:06 +00004714 return Owned(OrigExpr);
Mike Stump11289f42009-09-09 15:08:12 +00004715
John McCalldadc5752010-08-24 06:29:42 +00004716 ExprResult Result(E->getExpr(0));
Mike Stump11289f42009-09-09 15:08:12 +00004717
Nate Begeman5ec4b312009-08-10 23:49:36 +00004718 for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i)
John McCallb268a282010-08-23 23:25:46 +00004719 Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, Result.get(),
4720 E->getExpr(i));
Mike Stump11289f42009-09-09 15:08:12 +00004721
John McCallb268a282010-08-23 23:25:46 +00004722 if (Result.isInvalid()) return ExprError();
4723
4724 return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), Result.get());
Nate Begeman5ec4b312009-08-10 23:49:36 +00004725}
4726
Sebastian Redla9351792012-02-11 23:51:47 +00004727ExprResult Sema::ActOnParenListExpr(SourceLocation L,
4728 SourceLocation R,
4729 MultiExprArg Val) {
Benjamin Kramerc215e762012-08-24 11:54:20 +00004730 Expr *expr = new (Context) ParenListExpr(Context, L, Val, R);
Nate Begeman5ec4b312009-08-10 23:49:36 +00004731 return Owned(expr);
4732}
4733
Chandler Carrutha8bea4b2011-02-18 23:54:50 +00004734/// \brief Emit a specialized diagnostic when one expression is a null pointer
Richard Trieu27ae4cb2011-09-02 01:51:02 +00004735/// constant and the other is not a pointer. Returns true if a diagnostic is
4736/// emitted.
Richard Trieud33e46e2011-09-06 20:06:39 +00004737bool Sema::DiagnoseConditionalForNull(Expr *LHSExpr, Expr *RHSExpr,
Chandler Carrutha8bea4b2011-02-18 23:54:50 +00004738 SourceLocation QuestionLoc) {
Richard Trieud33e46e2011-09-06 20:06:39 +00004739 Expr *NullExpr = LHSExpr;
4740 Expr *NonPointerExpr = RHSExpr;
Chandler Carrutha8bea4b2011-02-18 23:54:50 +00004741 Expr::NullPointerConstantKind NullKind =
4742 NullExpr->isNullPointerConstant(Context,
4743 Expr::NPC_ValueDependentIsNotNull);
4744
4745 if (NullKind == Expr::NPCK_NotNull) {
Richard Trieud33e46e2011-09-06 20:06:39 +00004746 NullExpr = RHSExpr;
4747 NonPointerExpr = LHSExpr;
Chandler Carrutha8bea4b2011-02-18 23:54:50 +00004748 NullKind =
4749 NullExpr->isNullPointerConstant(Context,
4750 Expr::NPC_ValueDependentIsNotNull);
4751 }
4752
4753 if (NullKind == Expr::NPCK_NotNull)
4754 return false;
4755
David Blaikie1c7c8f72012-08-08 17:33:31 +00004756 if (NullKind == Expr::NPCK_ZeroExpression)
4757 return false;
4758
4759 if (NullKind == Expr::NPCK_ZeroLiteral) {
Chandler Carrutha8bea4b2011-02-18 23:54:50 +00004760 // In this case, check to make sure that we got here from a "NULL"
4761 // string in the source code.
4762 NullExpr = NullExpr->IgnoreParenImpCasts();
John McCall462c0552011-03-08 07:59:04 +00004763 SourceLocation loc = NullExpr->getExprLoc();
4764 if (!findMacroSpelling(loc, "NULL"))
Chandler Carrutha8bea4b2011-02-18 23:54:50 +00004765 return false;
4766 }
4767
Richard Smith89645bc2013-01-02 12:01:23 +00004768 int DiagType = (NullKind == Expr::NPCK_CXX11_nullptr);
Chandler Carrutha8bea4b2011-02-18 23:54:50 +00004769 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands_null)
4770 << NonPointerExpr->getType() << DiagType
4771 << NonPointerExpr->getSourceRange();
4772 return true;
4773}
4774
Richard Trieu27ae4cb2011-09-02 01:51:02 +00004775/// \brief Return false if the condition expression is valid, true otherwise.
4776static bool checkCondition(Sema &S, Expr *Cond) {
4777 QualType CondTy = Cond->getType();
4778
4779 // C99 6.5.15p2
4780 if (CondTy->isScalarType()) return false;
4781
4782 // OpenCL: Sec 6.3.i says the condition is allowed to be a vector or scalar.
David Blaikiebbafb8a2012-03-11 07:00:24 +00004783 if (S.getLangOpts().OpenCL && CondTy->isVectorType())
Richard Trieu27ae4cb2011-09-02 01:51:02 +00004784 return false;
4785
4786 // Emit the proper error message.
David Blaikiebbafb8a2012-03-11 07:00:24 +00004787 S.Diag(Cond->getLocStart(), S.getLangOpts().OpenCL ?
Richard Trieu27ae4cb2011-09-02 01:51:02 +00004788 diag::err_typecheck_cond_expect_scalar :
4789 diag::err_typecheck_cond_expect_scalar_or_vector)
4790 << CondTy;
4791 return true;
4792}
4793
4794/// \brief Return false if the two expressions can be converted to a vector,
4795/// true otherwise
4796static bool checkConditionalConvertScalarsToVectors(Sema &S, ExprResult &LHS,
4797 ExprResult &RHS,
4798 QualType CondTy) {
4799 // Both operands should be of scalar type.
4800 if (!LHS.get()->getType()->isScalarType()) {
4801 S.Diag(LHS.get()->getLocStart(), diag::err_typecheck_cond_expect_scalar)
4802 << CondTy;
4803 return true;
4804 }
4805 if (!RHS.get()->getType()->isScalarType()) {
4806 S.Diag(RHS.get()->getLocStart(), diag::err_typecheck_cond_expect_scalar)
4807 << CondTy;
4808 return true;
4809 }
4810
4811 // Implicity convert these scalars to the type of the condition.
4812 LHS = S.ImpCastExprToType(LHS.take(), CondTy, CK_IntegralCast);
4813 RHS = S.ImpCastExprToType(RHS.take(), CondTy, CK_IntegralCast);
4814 return false;
4815}
4816
4817/// \brief Handle when one or both operands are void type.
4818static QualType checkConditionalVoidType(Sema &S, ExprResult &LHS,
4819 ExprResult &RHS) {
4820 Expr *LHSExpr = LHS.get();
4821 Expr *RHSExpr = RHS.get();
4822
4823 if (!LHSExpr->getType()->isVoidType())
4824 S.Diag(RHSExpr->getLocStart(), diag::ext_typecheck_cond_one_void)
4825 << RHSExpr->getSourceRange();
4826 if (!RHSExpr->getType()->isVoidType())
4827 S.Diag(LHSExpr->getLocStart(), diag::ext_typecheck_cond_one_void)
4828 << LHSExpr->getSourceRange();
4829 LHS = S.ImpCastExprToType(LHS.take(), S.Context.VoidTy, CK_ToVoid);
4830 RHS = S.ImpCastExprToType(RHS.take(), S.Context.VoidTy, CK_ToVoid);
4831 return S.Context.VoidTy;
4832}
4833
4834/// \brief Return false if the NullExpr can be promoted to PointerTy,
4835/// true otherwise.
4836static bool checkConditionalNullPointer(Sema &S, ExprResult &NullExpr,
4837 QualType PointerTy) {
4838 if ((!PointerTy->isAnyPointerType() && !PointerTy->isBlockPointerType()) ||
4839 !NullExpr.get()->isNullPointerConstant(S.Context,
4840 Expr::NPC_ValueDependentIsNull))
4841 return true;
4842
4843 NullExpr = S.ImpCastExprToType(NullExpr.take(), PointerTy, CK_NullToPointer);
4844 return false;
4845}
4846
4847/// \brief Checks compatibility between two pointers and return the resulting
4848/// type.
4849static QualType checkConditionalPointerCompatibility(Sema &S, ExprResult &LHS,
4850 ExprResult &RHS,
4851 SourceLocation Loc) {
4852 QualType LHSTy = LHS.get()->getType();
4853 QualType RHSTy = RHS.get()->getType();
4854
4855 if (S.Context.hasSameType(LHSTy, RHSTy)) {
4856 // Two identical pointers types are always compatible.
4857 return LHSTy;
4858 }
4859
4860 QualType lhptee, rhptee;
4861
4862 // Get the pointee types.
John McCall9320b872011-09-09 05:25:32 +00004863 if (const BlockPointerType *LHSBTy = LHSTy->getAs<BlockPointerType>()) {
4864 lhptee = LHSBTy->getPointeeType();
4865 rhptee = RHSTy->castAs<BlockPointerType>()->getPointeeType();
Richard Trieu27ae4cb2011-09-02 01:51:02 +00004866 } else {
John McCall9320b872011-09-09 05:25:32 +00004867 lhptee = LHSTy->castAs<PointerType>()->getPointeeType();
4868 rhptee = RHSTy->castAs<PointerType>()->getPointeeType();
Richard Trieu27ae4cb2011-09-02 01:51:02 +00004869 }
4870
Eli Friedman57a75392012-04-05 22:30:04 +00004871 // C99 6.5.15p6: If both operands are pointers to compatible types or to
4872 // differently qualified versions of compatible types, the result type is
4873 // a pointer to an appropriately qualified version of the composite
4874 // type.
4875
4876 // Only CVR-qualifiers exist in the standard, and the differently-qualified
4877 // clause doesn't make sense for our extensions. E.g. address space 2 should
4878 // be incompatible with address space 3: they may live on different devices or
4879 // anything.
4880 Qualifiers lhQual = lhptee.getQualifiers();
4881 Qualifiers rhQual = rhptee.getQualifiers();
4882
4883 unsigned MergedCVRQual = lhQual.getCVRQualifiers() | rhQual.getCVRQualifiers();
4884 lhQual.removeCVRQualifiers();
4885 rhQual.removeCVRQualifiers();
4886
4887 lhptee = S.Context.getQualifiedType(lhptee.getUnqualifiedType(), lhQual);
4888 rhptee = S.Context.getQualifiedType(rhptee.getUnqualifiedType(), rhQual);
4889
4890 QualType CompositeTy = S.Context.mergeTypes(lhptee, rhptee);
4891
4892 if (CompositeTy.isNull()) {
Richard Trieu27ae4cb2011-09-02 01:51:02 +00004893 S.Diag(Loc, diag::warn_typecheck_cond_incompatible_pointers)
4894 << LHSTy << RHSTy << LHS.get()->getSourceRange()
4895 << RHS.get()->getSourceRange();
4896 // In this situation, we assume void* type. No especially good
4897 // reason, but this is what gcc does, and we do have to pick
4898 // to get a consistent AST.
4899 QualType incompatTy = S.Context.getPointerType(S.Context.VoidTy);
4900 LHS = S.ImpCastExprToType(LHS.take(), incompatTy, CK_BitCast);
4901 RHS = S.ImpCastExprToType(RHS.take(), incompatTy, CK_BitCast);
4902 return incompatTy;
4903 }
4904
4905 // The pointer types are compatible.
Eli Friedman57a75392012-04-05 22:30:04 +00004906 QualType ResultTy = CompositeTy.withCVRQualifiers(MergedCVRQual);
4907 ResultTy = S.Context.getPointerType(ResultTy);
Richard Trieu27ae4cb2011-09-02 01:51:02 +00004908
Eli Friedman57a75392012-04-05 22:30:04 +00004909 LHS = S.ImpCastExprToType(LHS.take(), ResultTy, CK_BitCast);
4910 RHS = S.ImpCastExprToType(RHS.take(), ResultTy, CK_BitCast);
4911 return ResultTy;
Richard Trieu27ae4cb2011-09-02 01:51:02 +00004912}
4913
4914/// \brief Return the resulting type when the operands are both block pointers.
4915static QualType checkConditionalBlockPointerCompatibility(Sema &S,
4916 ExprResult &LHS,
4917 ExprResult &RHS,
4918 SourceLocation Loc) {
4919 QualType LHSTy = LHS.get()->getType();
4920 QualType RHSTy = RHS.get()->getType();
4921
4922 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) {
4923 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) {
4924 QualType destType = S.Context.getPointerType(S.Context.VoidTy);
4925 LHS = S.ImpCastExprToType(LHS.take(), destType, CK_BitCast);
4926 RHS = S.ImpCastExprToType(RHS.take(), destType, CK_BitCast);
4927 return destType;
4928 }
4929 S.Diag(Loc, diag::err_typecheck_cond_incompatible_operands)
4930 << LHSTy << RHSTy << LHS.get()->getSourceRange()
4931 << RHS.get()->getSourceRange();
4932 return QualType();
4933 }
4934
4935 // We have 2 block pointer types.
4936 return checkConditionalPointerCompatibility(S, LHS, RHS, Loc);
4937}
4938
4939/// \brief Return the resulting type when the operands are both pointers.
4940static QualType
4941checkConditionalObjectPointersCompatibility(Sema &S, ExprResult &LHS,
4942 ExprResult &RHS,
4943 SourceLocation Loc) {
4944 // get the pointer types
4945 QualType LHSTy = LHS.get()->getType();
4946 QualType RHSTy = RHS.get()->getType();
4947
4948 // get the "pointed to" types
4949 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
4950 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
4951
4952 // ignore qualifiers on void (C99 6.5.15p3, clause 6)
4953 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) {
4954 // Figure out necessary qualifiers (C99 6.5.15p6)
4955 QualType destPointee
4956 = S.Context.getQualifiedType(lhptee, rhptee.getQualifiers());
4957 QualType destType = S.Context.getPointerType(destPointee);
4958 // Add qualifiers if necessary.
4959 LHS = S.ImpCastExprToType(LHS.take(), destType, CK_NoOp);
4960 // Promote to void*.
4961 RHS = S.ImpCastExprToType(RHS.take(), destType, CK_BitCast);
4962 return destType;
4963 }
4964 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) {
4965 QualType destPointee
4966 = S.Context.getQualifiedType(rhptee, lhptee.getQualifiers());
4967 QualType destType = S.Context.getPointerType(destPointee);
4968 // Add qualifiers if necessary.
4969 RHS = S.ImpCastExprToType(RHS.take(), destType, CK_NoOp);
4970 // Promote to void*.
4971 LHS = S.ImpCastExprToType(LHS.take(), destType, CK_BitCast);
4972 return destType;
4973 }
4974
4975 return checkConditionalPointerCompatibility(S, LHS, RHS, Loc);
4976}
4977
4978/// \brief Return false if the first expression is not an integer and the second
4979/// expression is not a pointer, true otherwise.
4980static bool checkPointerIntegerMismatch(Sema &S, ExprResult &Int,
4981 Expr* PointerExpr, SourceLocation Loc,
Richard Trieuba63ce62011-09-09 01:45:06 +00004982 bool IsIntFirstExpr) {
Richard Trieu27ae4cb2011-09-02 01:51:02 +00004983 if (!PointerExpr->getType()->isPointerType() ||
4984 !Int.get()->getType()->isIntegerType())
4985 return false;
4986
Richard Trieuba63ce62011-09-09 01:45:06 +00004987 Expr *Expr1 = IsIntFirstExpr ? Int.get() : PointerExpr;
4988 Expr *Expr2 = IsIntFirstExpr ? PointerExpr : Int.get();
Richard Trieu27ae4cb2011-09-02 01:51:02 +00004989
4990 S.Diag(Loc, diag::warn_typecheck_cond_pointer_integer_mismatch)
4991 << Expr1->getType() << Expr2->getType()
4992 << Expr1->getSourceRange() << Expr2->getSourceRange();
4993 Int = S.ImpCastExprToType(Int.take(), PointerExpr->getType(),
4994 CK_IntegralToPointer);
4995 return true;
4996}
4997
Richard Trieud33e46e2011-09-06 20:06:39 +00004998/// Note that LHS is not null here, even if this is the gnu "x ?: y" extension.
4999/// In that case, LHS = cond.
Chris Lattner2c486602009-02-18 04:38:20 +00005000/// C99 6.5.15
Richard Trieucfc491d2011-08-02 04:35:43 +00005001QualType Sema::CheckConditionalOperands(ExprResult &Cond, ExprResult &LHS,
5002 ExprResult &RHS, ExprValueKind &VK,
5003 ExprObjectKind &OK,
Chris Lattner2c486602009-02-18 04:38:20 +00005004 SourceLocation QuestionLoc) {
Douglas Gregor1beec452011-03-12 01:48:56 +00005005
Richard Trieud33e46e2011-09-06 20:06:39 +00005006 ExprResult LHSResult = CheckPlaceholderExpr(LHS.get());
5007 if (!LHSResult.isUsable()) return QualType();
Benjamin Kramer62b95d82012-08-23 21:35:17 +00005008 LHS = LHSResult;
Douglas Gregor0124e9b2010-11-09 21:07:58 +00005009
Richard Trieud33e46e2011-09-06 20:06:39 +00005010 ExprResult RHSResult = CheckPlaceholderExpr(RHS.get());
5011 if (!RHSResult.isUsable()) return QualType();
Benjamin Kramer62b95d82012-08-23 21:35:17 +00005012 RHS = RHSResult;
Douglas Gregor0124e9b2010-11-09 21:07:58 +00005013
Sebastian Redl1a99f442009-04-16 17:51:27 +00005014 // C++ is sufficiently different to merit its own checker.
David Blaikiebbafb8a2012-03-11 07:00:24 +00005015 if (getLangOpts().CPlusPlus)
John McCallc07a0c72011-02-17 10:25:35 +00005016 return CXXCheckConditionalOperands(Cond, LHS, RHS, VK, OK, QuestionLoc);
John McCall7decc9e2010-11-18 06:31:45 +00005017
5018 VK = VK_RValue;
John McCall4bc41ae2010-11-18 19:01:18 +00005019 OK = OK_Ordinary;
Sebastian Redl1a99f442009-04-16 17:51:27 +00005020
John Wiegley01296292011-04-08 18:41:53 +00005021 Cond = UsualUnaryConversions(Cond.take());
5022 if (Cond.isInvalid())
5023 return QualType();
5024 LHS = UsualUnaryConversions(LHS.take());
5025 if (LHS.isInvalid())
5026 return QualType();
5027 RHS = UsualUnaryConversions(RHS.take());
5028 if (RHS.isInvalid())
5029 return QualType();
5030
5031 QualType CondTy = Cond.get()->getType();
5032 QualType LHSTy = LHS.get()->getType();
5033 QualType RHSTy = RHS.get()->getType();
Steve Naroff31090012007-07-16 21:54:35 +00005034
Steve Naroffa78fe7e2007-05-16 19:47:19 +00005035 // first, check the condition.
Richard Trieu27ae4cb2011-09-02 01:51:02 +00005036 if (checkCondition(*this, Cond.get()))
5037 return QualType();
Mike Stump4e1f26a2009-02-19 03:04:26 +00005038
Chris Lattnere2949f42008-01-06 22:42:25 +00005039 // Now check the two expressions.
Nate Begeman5ec4b312009-08-10 23:49:36 +00005040 if (LHSTy->isVectorType() || RHSTy->isVectorType())
Eli Friedman1408bc92011-06-23 18:10:35 +00005041 return CheckVectorOperands(LHS, RHS, QuestionLoc, /*isCompAssign*/false);
Douglas Gregor4619e432008-12-05 23:32:09 +00005042
Nate Begemanabb5a732010-09-20 22:41:17 +00005043 // OpenCL: If the condition is a vector, and both operands are scalar,
5044 // attempt to implicity convert them to the vector type to act like the
5045 // built in select.
David Blaikiebbafb8a2012-03-11 07:00:24 +00005046 if (getLangOpts().OpenCL && CondTy->isVectorType())
Richard Trieu27ae4cb2011-09-02 01:51:02 +00005047 if (checkConditionalConvertScalarsToVectors(*this, LHS, RHS, CondTy))
Nate Begemanabb5a732010-09-20 22:41:17 +00005048 return QualType();
Nate Begemanabb5a732010-09-20 22:41:17 +00005049
Chris Lattnere2949f42008-01-06 22:42:25 +00005050 // If both operands have arithmetic type, do the usual arithmetic conversions
5051 // to find a common type: C99 6.5.15p3,5.
Chris Lattner432cff52009-02-18 04:28:32 +00005052 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) {
5053 UsualArithmeticConversions(LHS, RHS);
John Wiegley01296292011-04-08 18:41:53 +00005054 if (LHS.isInvalid() || RHS.isInvalid())
5055 return QualType();
5056 return LHS.get()->getType();
Steve Naroffdbd9e892007-07-17 00:58:39 +00005057 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00005058
Chris Lattnere2949f42008-01-06 22:42:25 +00005059 // If both operands are the same structure or union type, the result is that
5060 // type.
Ted Kremenekc23c7e62009-07-29 21:53:49 +00005061 if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3
5062 if (const RecordType *RHSRT = RHSTy->getAs<RecordType>())
Chris Lattner2ab40a62007-11-26 01:40:58 +00005063 if (LHSRT->getDecl() == RHSRT->getDecl())
Mike Stump4e1f26a2009-02-19 03:04:26 +00005064 // "If both the operands have structure or union type, the result has
Chris Lattnere2949f42008-01-06 22:42:25 +00005065 // that type." This implies that CV qualifiers are dropped.
Chris Lattner432cff52009-02-18 04:28:32 +00005066 return LHSTy.getUnqualifiedType();
Eli Friedmanba961a92009-03-23 00:24:07 +00005067 // FIXME: Type of conditional expression must be complete in C mode.
Steve Naroffa78fe7e2007-05-16 19:47:19 +00005068 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00005069
Chris Lattnere2949f42008-01-06 22:42:25 +00005070 // C99 6.5.15p5: "If both operands have void type, the result has void type."
Steve Naroffbf1516c2008-05-12 21:44:38 +00005071 // The following || allows only one side to be void (a GCC-ism).
Chris Lattner432cff52009-02-18 04:28:32 +00005072 if (LHSTy->isVoidType() || RHSTy->isVoidType()) {
Richard Trieu27ae4cb2011-09-02 01:51:02 +00005073 return checkConditionalVoidType(*this, LHS, RHS);
Steve Naroffbf1516c2008-05-12 21:44:38 +00005074 }
Richard Trieu27ae4cb2011-09-02 01:51:02 +00005075
Steve Naroff039ad3c2008-01-08 01:11:38 +00005076 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has
5077 // the type of the other operand."
Richard Trieu27ae4cb2011-09-02 01:51:02 +00005078 if (!checkConditionalNullPointer(*this, RHS, LHSTy)) return LHSTy;
5079 if (!checkConditionalNullPointer(*this, LHS, RHSTy)) return RHSTy;
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00005080
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005081 // All objective-c pointer type analysis is done here.
5082 QualType compositeType = FindCompositeObjCPointerType(LHS, RHS,
5083 QuestionLoc);
John Wiegley01296292011-04-08 18:41:53 +00005084 if (LHS.isInvalid() || RHS.isInvalid())
5085 return QualType();
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005086 if (!compositeType.isNull())
5087 return compositeType;
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00005088
5089
Steve Naroff05efa972009-07-01 14:36:47 +00005090 // Handle block pointer types.
Richard Trieu27ae4cb2011-09-02 01:51:02 +00005091 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType())
5092 return checkConditionalBlockPointerCompatibility(*this, LHS, RHS,
5093 QuestionLoc);
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00005094
Steve Naroff05efa972009-07-01 14:36:47 +00005095 // Check constraints for C object pointers types (C99 6.5.15p3,6).
Richard Trieu27ae4cb2011-09-02 01:51:02 +00005096 if (LHSTy->isPointerType() && RHSTy->isPointerType())
5097 return checkConditionalObjectPointersCompatibility(*this, LHS, RHS,
5098 QuestionLoc);
Mike Stump11289f42009-09-09 15:08:12 +00005099
John McCalle84af4e2010-11-13 01:35:44 +00005100 // GCC compatibility: soften pointer/integer mismatch. Note that
5101 // null pointers have been filtered out by this point.
Richard Trieu27ae4cb2011-09-02 01:51:02 +00005102 if (checkPointerIntegerMismatch(*this, LHS, RHS.get(), QuestionLoc,
5103 /*isIntFirstExpr=*/true))
Steve Naroff05efa972009-07-01 14:36:47 +00005104 return RHSTy;
Richard Trieu27ae4cb2011-09-02 01:51:02 +00005105 if (checkPointerIntegerMismatch(*this, RHS, LHS.get(), QuestionLoc,
5106 /*isIntFirstExpr=*/false))
Steve Naroff05efa972009-07-01 14:36:47 +00005107 return LHSTy;
Daniel Dunbar484603b2008-09-11 23:12:46 +00005108
Chandler Carrutha8bea4b2011-02-18 23:54:50 +00005109 // Emit a better diagnostic if one of the expressions is a null pointer
5110 // constant and the other is not a pointer type. In this case, the user most
5111 // likely forgot to take the address of the other expression.
John Wiegley01296292011-04-08 18:41:53 +00005112 if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
Chandler Carrutha8bea4b2011-02-18 23:54:50 +00005113 return QualType();
5114
Chris Lattnere2949f42008-01-06 22:42:25 +00005115 // Otherwise, the operands are not compatible.
Chris Lattner432cff52009-02-18 04:28:32 +00005116 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
Richard Trieucfc491d2011-08-02 04:35:43 +00005117 << LHSTy << RHSTy << LHS.get()->getSourceRange()
5118 << RHS.get()->getSourceRange();
Steve Naroffa78fe7e2007-05-16 19:47:19 +00005119 return QualType();
Steve Narofff8a28c52007-05-15 20:29:32 +00005120}
5121
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005122/// FindCompositeObjCPointerType - Helper method to find composite type of
5123/// two objective-c pointer types of the two input expressions.
John Wiegley01296292011-04-08 18:41:53 +00005124QualType Sema::FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
Richard Trieucfc491d2011-08-02 04:35:43 +00005125 SourceLocation QuestionLoc) {
John Wiegley01296292011-04-08 18:41:53 +00005126 QualType LHSTy = LHS.get()->getType();
5127 QualType RHSTy = RHS.get()->getType();
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00005128
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005129 // Handle things like Class and struct objc_class*. Here we case the result
5130 // to the pseudo-builtin, because that will be implicitly cast back to the
5131 // redefinition type if an attempt is made to access its fields.
5132 if (LHSTy->isObjCClassType() &&
Douglas Gregor97673472011-08-11 20:58:55 +00005133 (Context.hasSameType(RHSTy, Context.getObjCClassRedefinitionType()))) {
John McCall9320b872011-09-09 05:25:32 +00005134 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_CPointerToObjCPointerCast);
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005135 return LHSTy;
5136 }
5137 if (RHSTy->isObjCClassType() &&
Douglas Gregor97673472011-08-11 20:58:55 +00005138 (Context.hasSameType(LHSTy, Context.getObjCClassRedefinitionType()))) {
John McCall9320b872011-09-09 05:25:32 +00005139 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_CPointerToObjCPointerCast);
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005140 return RHSTy;
5141 }
5142 // And the same for struct objc_object* / id
5143 if (LHSTy->isObjCIdType() &&
Douglas Gregor97673472011-08-11 20:58:55 +00005144 (Context.hasSameType(RHSTy, Context.getObjCIdRedefinitionType()))) {
John McCall9320b872011-09-09 05:25:32 +00005145 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_CPointerToObjCPointerCast);
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005146 return LHSTy;
5147 }
5148 if (RHSTy->isObjCIdType() &&
Douglas Gregor97673472011-08-11 20:58:55 +00005149 (Context.hasSameType(LHSTy, Context.getObjCIdRedefinitionType()))) {
John McCall9320b872011-09-09 05:25:32 +00005150 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_CPointerToObjCPointerCast);
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005151 return RHSTy;
5152 }
5153 // And the same for struct objc_selector* / SEL
5154 if (Context.isObjCSelType(LHSTy) &&
Douglas Gregor97673472011-08-11 20:58:55 +00005155 (Context.hasSameType(RHSTy, Context.getObjCSelRedefinitionType()))) {
John Wiegley01296292011-04-08 18:41:53 +00005156 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005157 return LHSTy;
5158 }
5159 if (Context.isObjCSelType(RHSTy) &&
Douglas Gregor97673472011-08-11 20:58:55 +00005160 (Context.hasSameType(LHSTy, Context.getObjCSelRedefinitionType()))) {
John Wiegley01296292011-04-08 18:41:53 +00005161 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_BitCast);
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005162 return RHSTy;
5163 }
5164 // Check constraints for Objective-C object pointers types.
5165 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) {
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00005166
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005167 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
5168 // Two identical object pointer types are always compatible.
5169 return LHSTy;
5170 }
John McCall9320b872011-09-09 05:25:32 +00005171 const ObjCObjectPointerType *LHSOPT = LHSTy->castAs<ObjCObjectPointerType>();
5172 const ObjCObjectPointerType *RHSOPT = RHSTy->castAs<ObjCObjectPointerType>();
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005173 QualType compositeType = LHSTy;
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00005174
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005175 // If both operands are interfaces and either operand can be
5176 // assigned to the other, use that type as the composite
5177 // type. This allows
5178 // xxx ? (A*) a : (B*) b
5179 // where B is a subclass of A.
5180 //
5181 // Additionally, as for assignment, if either type is 'id'
5182 // allow silent coercion. Finally, if the types are
5183 // incompatible then make sure to use 'id' as the composite
5184 // type so the result is acceptable for sending messages to.
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00005185
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005186 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'.
5187 // It could return the composite type.
5188 if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) {
5189 compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy;
5190 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) {
5191 compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy;
5192 } else if ((LHSTy->isObjCQualifiedIdType() ||
5193 RHSTy->isObjCQualifiedIdType()) &&
5194 Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) {
5195 // Need to handle "id<xx>" explicitly.
5196 // GCC allows qualified id and any Objective-C type to devolve to
5197 // id. Currently localizing to here until clear this should be
5198 // part of ObjCQualifiedIdTypesAreCompatible.
5199 compositeType = Context.getObjCIdType();
5200 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) {
5201 compositeType = Context.getObjCIdType();
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00005202 } else if (!(compositeType =
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005203 Context.areCommonBaseCompatible(LHSOPT, RHSOPT)).isNull())
5204 ;
5205 else {
5206 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands)
5207 << LHSTy << RHSTy
John Wiegley01296292011-04-08 18:41:53 +00005208 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005209 QualType incompatTy = Context.getObjCIdType();
John Wiegley01296292011-04-08 18:41:53 +00005210 LHS = ImpCastExprToType(LHS.take(), incompatTy, CK_BitCast);
5211 RHS = ImpCastExprToType(RHS.take(), incompatTy, CK_BitCast);
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005212 return incompatTy;
5213 }
5214 // The object pointer types are compatible.
John Wiegley01296292011-04-08 18:41:53 +00005215 LHS = ImpCastExprToType(LHS.take(), compositeType, CK_BitCast);
5216 RHS = ImpCastExprToType(RHS.take(), compositeType, CK_BitCast);
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005217 return compositeType;
5218 }
5219 // Check Objective-C object pointer types and 'void *'
5220 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) {
David Blaikiebbafb8a2012-03-11 07:00:24 +00005221 if (getLangOpts().ObjCAutoRefCount) {
Eli Friedman8a78a582012-02-25 00:23:44 +00005222 // ARC forbids the implicit conversion of object pointers to 'void *',
5223 // so these types are not compatible.
5224 Diag(QuestionLoc, diag::err_cond_voidptr_arc) << LHSTy << RHSTy
5225 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
5226 LHS = RHS = true;
5227 return QualType();
5228 }
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005229 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
5230 QualType rhptee = RHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
5231 QualType destPointee
5232 = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
5233 QualType destType = Context.getPointerType(destPointee);
5234 // Add qualifiers if necessary.
John Wiegley01296292011-04-08 18:41:53 +00005235 LHS = ImpCastExprToType(LHS.take(), destType, CK_NoOp);
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005236 // Promote to void*.
John Wiegley01296292011-04-08 18:41:53 +00005237 RHS = ImpCastExprToType(RHS.take(), destType, CK_BitCast);
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005238 return destType;
5239 }
5240 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) {
David Blaikiebbafb8a2012-03-11 07:00:24 +00005241 if (getLangOpts().ObjCAutoRefCount) {
Eli Friedman8a78a582012-02-25 00:23:44 +00005242 // ARC forbids the implicit conversion of object pointers to 'void *',
5243 // so these types are not compatible.
5244 Diag(QuestionLoc, diag::err_cond_voidptr_arc) << LHSTy << RHSTy
5245 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
5246 LHS = RHS = true;
5247 return QualType();
5248 }
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005249 QualType lhptee = LHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
5250 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
5251 QualType destPointee
5252 = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
5253 QualType destType = Context.getPointerType(destPointee);
5254 // Add qualifiers if necessary.
John Wiegley01296292011-04-08 18:41:53 +00005255 RHS = ImpCastExprToType(RHS.take(), destType, CK_NoOp);
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005256 // Promote to void*.
John Wiegley01296292011-04-08 18:41:53 +00005257 LHS = ImpCastExprToType(LHS.take(), destType, CK_BitCast);
Fariborz Jahaniana430f712009-12-10 19:47:41 +00005258 return destType;
5259 }
5260 return QualType();
5261}
5262
Chandler Carruthb00e8c02011-06-16 01:05:14 +00005263/// SuggestParentheses - Emit a note with a fixit hint that wraps
Hans Wennborgcf9bac42011-06-03 18:00:36 +00005264/// ParenRange in parentheses.
5265static void SuggestParentheses(Sema &Self, SourceLocation Loc,
Chandler Carruthb00e8c02011-06-16 01:05:14 +00005266 const PartialDiagnostic &Note,
5267 SourceRange ParenRange) {
5268 SourceLocation EndLoc = Self.PP.getLocForEndOfToken(ParenRange.getEnd());
5269 if (ParenRange.getBegin().isFileID() && ParenRange.getEnd().isFileID() &&
5270 EndLoc.isValid()) {
5271 Self.Diag(Loc, Note)
5272 << FixItHint::CreateInsertion(ParenRange.getBegin(), "(")
5273 << FixItHint::CreateInsertion(EndLoc, ")");
5274 } else {
5275 // We can't display the parentheses, so just show the bare note.
5276 Self.Diag(Loc, Note) << ParenRange;
Hans Wennborgcf9bac42011-06-03 18:00:36 +00005277 }
Hans Wennborgcf9bac42011-06-03 18:00:36 +00005278}
5279
5280static bool IsArithmeticOp(BinaryOperatorKind Opc) {
5281 return Opc >= BO_Mul && Opc <= BO_Shr;
5282}
5283
Hans Wennborgde2e67e2011-06-09 17:06:51 +00005284/// IsArithmeticBinaryExpr - Returns true if E is an arithmetic binary
5285/// expression, either using a built-in or overloaded operator,
Richard Trieud33e46e2011-09-06 20:06:39 +00005286/// and sets *OpCode to the opcode and *RHSExprs to the right-hand side
5287/// expression.
Hans Wennborgde2e67e2011-06-09 17:06:51 +00005288static bool IsArithmeticBinaryExpr(Expr *E, BinaryOperatorKind *Opcode,
Richard Trieud33e46e2011-09-06 20:06:39 +00005289 Expr **RHSExprs) {
Hans Wennborgbe207b32011-09-12 12:07:30 +00005290 // Don't strip parenthesis: we should not warn if E is in parenthesis.
5291 E = E->IgnoreImpCasts();
Hans Wennborgde2e67e2011-06-09 17:06:51 +00005292 E = E->IgnoreConversionOperator();
Hans Wennborgbe207b32011-09-12 12:07:30 +00005293 E = E->IgnoreImpCasts();
Hans Wennborgde2e67e2011-06-09 17:06:51 +00005294
5295 // Built-in binary operator.
5296 if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E)) {
5297 if (IsArithmeticOp(OP->getOpcode())) {
5298 *Opcode = OP->getOpcode();
Richard Trieud33e46e2011-09-06 20:06:39 +00005299 *RHSExprs = OP->getRHS();
Hans Wennborgde2e67e2011-06-09 17:06:51 +00005300 return true;
5301 }
5302 }
5303
5304 // Overloaded operator.
5305 if (CXXOperatorCallExpr *Call = dyn_cast<CXXOperatorCallExpr>(E)) {
5306 if (Call->getNumArgs() != 2)
5307 return false;
5308
5309 // Make sure this is really a binary operator that is safe to pass into
5310 // BinaryOperator::getOverloadedOpcode(), e.g. it's not a subscript op.
5311 OverloadedOperatorKind OO = Call->getOperator();
5312 if (OO < OO_Plus || OO > OO_Arrow)
5313 return false;
5314
5315 BinaryOperatorKind OpKind = BinaryOperator::getOverloadedOpcode(OO);
5316 if (IsArithmeticOp(OpKind)) {
5317 *Opcode = OpKind;
Richard Trieud33e46e2011-09-06 20:06:39 +00005318 *RHSExprs = Call->getArg(1);
Hans Wennborgde2e67e2011-06-09 17:06:51 +00005319 return true;
5320 }
5321 }
5322
5323 return false;
5324}
5325
Hans Wennborgcf9bac42011-06-03 18:00:36 +00005326static bool IsLogicOp(BinaryOperatorKind Opc) {
5327 return (Opc >= BO_LT && Opc <= BO_NE) || (Opc >= BO_LAnd && Opc <= BO_LOr);
5328}
5329
Hans Wennborgde2e67e2011-06-09 17:06:51 +00005330/// ExprLooksBoolean - Returns true if E looks boolean, i.e. it has boolean type
5331/// or is a logical expression such as (x==y) which has int type, but is
5332/// commonly interpreted as boolean.
5333static bool ExprLooksBoolean(Expr *E) {
5334 E = E->IgnoreParenImpCasts();
5335
5336 if (E->getType()->isBooleanType())
5337 return true;
5338 if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E))
5339 return IsLogicOp(OP->getOpcode());
5340 if (UnaryOperator *OP = dyn_cast<UnaryOperator>(E))
5341 return OP->getOpcode() == UO_LNot;
5342
5343 return false;
5344}
5345
Hans Wennborgcf9bac42011-06-03 18:00:36 +00005346/// DiagnoseConditionalPrecedence - Emit a warning when a conditional operator
5347/// and binary operator are mixed in a way that suggests the programmer assumed
5348/// the conditional operator has higher precedence, for example:
5349/// "int x = a + someBinaryCondition ? 1 : 2".
5350static void DiagnoseConditionalPrecedence(Sema &Self,
5351 SourceLocation OpLoc,
Chandler Carruth08dc2ba2011-06-16 01:05:08 +00005352 Expr *Condition,
Richard Trieud33e46e2011-09-06 20:06:39 +00005353 Expr *LHSExpr,
5354 Expr *RHSExpr) {
Hans Wennborgde2e67e2011-06-09 17:06:51 +00005355 BinaryOperatorKind CondOpcode;
5356 Expr *CondRHS;
Hans Wennborgcf9bac42011-06-03 18:00:36 +00005357
Chandler Carruth08dc2ba2011-06-16 01:05:08 +00005358 if (!IsArithmeticBinaryExpr(Condition, &CondOpcode, &CondRHS))
Hans Wennborgde2e67e2011-06-09 17:06:51 +00005359 return;
5360 if (!ExprLooksBoolean(CondRHS))
5361 return;
Hans Wennborgcf9bac42011-06-03 18:00:36 +00005362
Hans Wennborgde2e67e2011-06-09 17:06:51 +00005363 // The condition is an arithmetic binary expression, with a right-
5364 // hand side that looks boolean, so warn.
Hans Wennborgcf9bac42011-06-03 18:00:36 +00005365
Chandler Carruthb00e8c02011-06-16 01:05:14 +00005366 Self.Diag(OpLoc, diag::warn_precedence_conditional)
Chandler Carruth08dc2ba2011-06-16 01:05:08 +00005367 << Condition->getSourceRange()
Hans Wennborgde2e67e2011-06-09 17:06:51 +00005368 << BinaryOperator::getOpcodeStr(CondOpcode);
Hans Wennborgcf9bac42011-06-03 18:00:36 +00005369
Chandler Carruthb00e8c02011-06-16 01:05:14 +00005370 SuggestParentheses(Self, OpLoc,
David Blaikiedac86fd2012-10-08 01:19:49 +00005371 Self.PDiag(diag::note_precedence_silence)
Chandler Carruthb00e8c02011-06-16 01:05:14 +00005372 << BinaryOperator::getOpcodeStr(CondOpcode),
5373 SourceRange(Condition->getLocStart(), Condition->getLocEnd()));
Chandler Carruthf51c5a52011-06-21 23:04:18 +00005374
5375 SuggestParentheses(Self, OpLoc,
5376 Self.PDiag(diag::note_precedence_conditional_first),
Richard Trieud33e46e2011-09-06 20:06:39 +00005377 SourceRange(CondRHS->getLocStart(), RHSExpr->getLocEnd()));
Hans Wennborgcf9bac42011-06-03 18:00:36 +00005378}
5379
Steve Naroff83895f72007-09-16 03:34:24 +00005380/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null
Chris Lattnere168f762006-11-10 05:29:30 +00005381/// in the case of a the GNU conditional expr extension.
John McCalldadc5752010-08-24 06:29:42 +00005382ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc,
John McCallc07a0c72011-02-17 10:25:35 +00005383 SourceLocation ColonLoc,
5384 Expr *CondExpr, Expr *LHSExpr,
5385 Expr *RHSExpr) {
Chris Lattner2ab40a62007-11-26 01:40:58 +00005386 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS
5387 // was the condition.
John McCallc07a0c72011-02-17 10:25:35 +00005388 OpaqueValueExpr *opaqueValue = 0;
5389 Expr *commonExpr = 0;
5390 if (LHSExpr == 0) {
5391 commonExpr = CondExpr;
5392
5393 // We usually want to apply unary conversions *before* saving, except
5394 // in the special case of a C++ l-value conditional.
David Blaikiebbafb8a2012-03-11 07:00:24 +00005395 if (!(getLangOpts().CPlusPlus
John McCallc07a0c72011-02-17 10:25:35 +00005396 && !commonExpr->isTypeDependent()
5397 && commonExpr->getValueKind() == RHSExpr->getValueKind()
5398 && commonExpr->isGLValue()
5399 && commonExpr->isOrdinaryOrBitFieldObject()
5400 && RHSExpr->isOrdinaryOrBitFieldObject()
5401 && Context.hasSameType(commonExpr->getType(), RHSExpr->getType()))) {
John Wiegley01296292011-04-08 18:41:53 +00005402 ExprResult commonRes = UsualUnaryConversions(commonExpr);
5403 if (commonRes.isInvalid())
5404 return ExprError();
5405 commonExpr = commonRes.take();
John McCallc07a0c72011-02-17 10:25:35 +00005406 }
5407
5408 opaqueValue = new (Context) OpaqueValueExpr(commonExpr->getExprLoc(),
5409 commonExpr->getType(),
5410 commonExpr->getValueKind(),
Douglas Gregor2d5aea02012-02-23 22:17:26 +00005411 commonExpr->getObjectKind(),
5412 commonExpr);
John McCallc07a0c72011-02-17 10:25:35 +00005413 LHSExpr = CondExpr = opaqueValue;
Fariborz Jahanianc6bf0bd2010-08-31 18:02:20 +00005414 }
Sebastian Redlb5d49352009-01-19 22:31:54 +00005415
John McCall7decc9e2010-11-18 06:31:45 +00005416 ExprValueKind VK = VK_RValue;
John McCall4bc41ae2010-11-18 19:01:18 +00005417 ExprObjectKind OK = OK_Ordinary;
John Wiegley01296292011-04-08 18:41:53 +00005418 ExprResult Cond = Owned(CondExpr), LHS = Owned(LHSExpr), RHS = Owned(RHSExpr);
5419 QualType result = CheckConditionalOperands(Cond, LHS, RHS,
John McCallc07a0c72011-02-17 10:25:35 +00005420 VK, OK, QuestionLoc);
John Wiegley01296292011-04-08 18:41:53 +00005421 if (result.isNull() || Cond.isInvalid() || LHS.isInvalid() ||
5422 RHS.isInvalid())
Sebastian Redlb5d49352009-01-19 22:31:54 +00005423 return ExprError();
5424
Hans Wennborgcf9bac42011-06-03 18:00:36 +00005425 DiagnoseConditionalPrecedence(*this, QuestionLoc, Cond.get(), LHS.get(),
5426 RHS.get());
5427
John McCallc07a0c72011-02-17 10:25:35 +00005428 if (!commonExpr)
John Wiegley01296292011-04-08 18:41:53 +00005429 return Owned(new (Context) ConditionalOperator(Cond.take(), QuestionLoc,
5430 LHS.take(), ColonLoc,
5431 RHS.take(), result, VK, OK));
John McCallc07a0c72011-02-17 10:25:35 +00005432
5433 return Owned(new (Context)
John Wiegley01296292011-04-08 18:41:53 +00005434 BinaryConditionalOperator(commonExpr, opaqueValue, Cond.take(), LHS.take(),
Richard Trieucfc491d2011-08-02 04:35:43 +00005435 RHS.take(), QuestionLoc, ColonLoc, result, VK,
5436 OK));
Chris Lattnere168f762006-11-10 05:29:30 +00005437}
5438
John McCallaba90822011-01-31 23:13:11 +00005439// checkPointerTypesForAssignment - This is a very tricky routine (despite
Mike Stump4e1f26a2009-02-19 03:04:26 +00005440// being closely modeled after the C99 spec:-). The odd characteristic of this
Steve Naroff3f597292007-05-11 22:18:03 +00005441// routine is it effectively iqnores the qualifiers on the top level pointee.
5442// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3].
5443// FIXME: add a couple examples in this comment.
John McCallaba90822011-01-31 23:13:11 +00005444static Sema::AssignConvertType
Richard Trieua871b972011-09-06 20:21:22 +00005445checkPointerTypesForAssignment(Sema &S, QualType LHSType, QualType RHSType) {
5446 assert(LHSType.isCanonical() && "LHS not canonicalized!");
5447 assert(RHSType.isCanonical() && "RHS not canonicalized!");
Mike Stump4e1f26a2009-02-19 03:04:26 +00005448
Steve Naroff1f4d7272007-05-11 04:00:31 +00005449 // get the "pointed to" type (ignoring qualifiers at the top level)
John McCall4fff8f62011-02-01 00:10:29 +00005450 const Type *lhptee, *rhptee;
5451 Qualifiers lhq, rhq;
Richard Trieua871b972011-09-06 20:21:22 +00005452 llvm::tie(lhptee, lhq) = cast<PointerType>(LHSType)->getPointeeType().split();
5453 llvm::tie(rhptee, rhq) = cast<PointerType>(RHSType)->getPointeeType().split();
Mike Stump4e1f26a2009-02-19 03:04:26 +00005454
John McCallaba90822011-01-31 23:13:11 +00005455 Sema::AssignConvertType ConvTy = Sema::Compatible;
Mike Stump4e1f26a2009-02-19 03:04:26 +00005456
5457 // C99 6.5.16.1p1: This following citation is common to constraints
5458 // 3 & 4 (below). ...and the type *pointed to* by the left has all the
5459 // qualifiers of the type *pointed to* by the right;
John McCall4fff8f62011-02-01 00:10:29 +00005460 Qualifiers lq;
5461
John McCall31168b02011-06-15 23:02:42 +00005462 // As a special case, 'non-__weak A *' -> 'non-__weak const *' is okay.
5463 if (lhq.getObjCLifetime() != rhq.getObjCLifetime() &&
5464 lhq.compatiblyIncludesObjCLifetime(rhq)) {
5465 // Ignore lifetime for further calculation.
5466 lhq.removeObjCLifetime();
5467 rhq.removeObjCLifetime();
5468 }
5469
John McCall4fff8f62011-02-01 00:10:29 +00005470 if (!lhq.compatiblyIncludes(rhq)) {
5471 // Treat address-space mismatches as fatal. TODO: address subspaces
5472 if (lhq.getAddressSpace() != rhq.getAddressSpace())
5473 ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
5474
John McCall31168b02011-06-15 23:02:42 +00005475 // It's okay to add or remove GC or lifetime qualifiers when converting to
John McCall78535952011-03-26 02:56:45 +00005476 // and from void*.
John McCall18ce25e2012-02-08 00:46:36 +00005477 else if (lhq.withoutObjCGCAttr().withoutObjCLifetime()
John McCall31168b02011-06-15 23:02:42 +00005478 .compatiblyIncludes(
John McCall18ce25e2012-02-08 00:46:36 +00005479 rhq.withoutObjCGCAttr().withoutObjCLifetime())
John McCall78535952011-03-26 02:56:45 +00005480 && (lhptee->isVoidType() || rhptee->isVoidType()))
5481 ; // keep old
5482
John McCall31168b02011-06-15 23:02:42 +00005483 // Treat lifetime mismatches as fatal.
5484 else if (lhq.getObjCLifetime() != rhq.getObjCLifetime())
5485 ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
5486
John McCall4fff8f62011-02-01 00:10:29 +00005487 // For GCC compatibility, other qualifier mismatches are treated
5488 // as still compatible in C.
5489 else ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
5490 }
Steve Naroff3f597292007-05-11 22:18:03 +00005491
Mike Stump4e1f26a2009-02-19 03:04:26 +00005492 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or
5493 // incomplete type and the other is a pointer to a qualified or unqualified
Steve Naroff3f597292007-05-11 22:18:03 +00005494 // version of void...
Chris Lattner0a788432008-01-03 22:56:36 +00005495 if (lhptee->isVoidType()) {
Chris Lattnerb3a176d2008-04-02 06:59:01 +00005496 if (rhptee->isIncompleteOrObjectType())
Chris Lattner9bad62c2008-01-04 18:04:52 +00005497 return ConvTy;
Mike Stump4e1f26a2009-02-19 03:04:26 +00005498
Chris Lattner0a788432008-01-03 22:56:36 +00005499 // As an extension, we allow cast to/from void* to function pointer.
Chris Lattnerb3a176d2008-04-02 06:59:01 +00005500 assert(rhptee->isFunctionType());
John McCallaba90822011-01-31 23:13:11 +00005501 return Sema::FunctionVoidPointer;
Chris Lattner0a788432008-01-03 22:56:36 +00005502 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00005503
Chris Lattner0a788432008-01-03 22:56:36 +00005504 if (rhptee->isVoidType()) {
Chris Lattnerb3a176d2008-04-02 06:59:01 +00005505 if (lhptee->isIncompleteOrObjectType())
Chris Lattner9bad62c2008-01-04 18:04:52 +00005506 return ConvTy;
Chris Lattner0a788432008-01-03 22:56:36 +00005507
5508 // As an extension, we allow cast to/from void* to function pointer.
Chris Lattnerb3a176d2008-04-02 06:59:01 +00005509 assert(lhptee->isFunctionType());
John McCallaba90822011-01-31 23:13:11 +00005510 return Sema::FunctionVoidPointer;
Chris Lattner0a788432008-01-03 22:56:36 +00005511 }
John McCall4fff8f62011-02-01 00:10:29 +00005512
Mike Stump4e1f26a2009-02-19 03:04:26 +00005513 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or
Steve Naroff3f597292007-05-11 22:18:03 +00005514 // unqualified versions of compatible types, ...
John McCall4fff8f62011-02-01 00:10:29 +00005515 QualType ltrans = QualType(lhptee, 0), rtrans = QualType(rhptee, 0);
5516 if (!S.Context.typesAreCompatible(ltrans, rtrans)) {
Eli Friedman80160bd2009-03-22 23:59:44 +00005517 // Check if the pointee types are compatible ignoring the sign.
5518 // We explicitly check for char so that we catch "char" vs
5519 // "unsigned char" on systems where "char" is unsigned.
Chris Lattnerec3a1562009-10-17 20:33:28 +00005520 if (lhptee->isCharType())
John McCall4fff8f62011-02-01 00:10:29 +00005521 ltrans = S.Context.UnsignedCharTy;
Douglas Gregor5cc2c8b2010-07-23 15:58:24 +00005522 else if (lhptee->hasSignedIntegerRepresentation())
John McCall4fff8f62011-02-01 00:10:29 +00005523 ltrans = S.Context.getCorrespondingUnsignedType(ltrans);
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00005524
Chris Lattnerec3a1562009-10-17 20:33:28 +00005525 if (rhptee->isCharType())
John McCall4fff8f62011-02-01 00:10:29 +00005526 rtrans = S.Context.UnsignedCharTy;
Douglas Gregor5cc2c8b2010-07-23 15:58:24 +00005527 else if (rhptee->hasSignedIntegerRepresentation())
John McCall4fff8f62011-02-01 00:10:29 +00005528 rtrans = S.Context.getCorrespondingUnsignedType(rtrans);
Chris Lattnerec3a1562009-10-17 20:33:28 +00005529
John McCall4fff8f62011-02-01 00:10:29 +00005530 if (ltrans == rtrans) {
Eli Friedman80160bd2009-03-22 23:59:44 +00005531 // Types are compatible ignoring the sign. Qualifier incompatibility
5532 // takes priority over sign incompatibility because the sign
5533 // warning can be disabled.
John McCallaba90822011-01-31 23:13:11 +00005534 if (ConvTy != Sema::Compatible)
Eli Friedman80160bd2009-03-22 23:59:44 +00005535 return ConvTy;
John McCall4fff8f62011-02-01 00:10:29 +00005536
John McCallaba90822011-01-31 23:13:11 +00005537 return Sema::IncompatiblePointerSign;
Eli Friedman80160bd2009-03-22 23:59:44 +00005538 }
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00005539
Fariborz Jahaniand7aa9d82009-11-07 20:20:40 +00005540 // If we are a multi-level pointer, it's possible that our issue is simply
5541 // one of qualification - e.g. char ** -> const char ** is not allowed. If
5542 // the eventual target type is the same and the pointers have the same
5543 // level of indirection, this must be the issue.
John McCallaba90822011-01-31 23:13:11 +00005544 if (isa<PointerType>(lhptee) && isa<PointerType>(rhptee)) {
Fariborz Jahaniand7aa9d82009-11-07 20:20:40 +00005545 do {
John McCall4fff8f62011-02-01 00:10:29 +00005546 lhptee = cast<PointerType>(lhptee)->getPointeeType().getTypePtr();
5547 rhptee = cast<PointerType>(rhptee)->getPointeeType().getTypePtr();
John McCallaba90822011-01-31 23:13:11 +00005548 } while (isa<PointerType>(lhptee) && isa<PointerType>(rhptee));
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00005549
John McCall4fff8f62011-02-01 00:10:29 +00005550 if (lhptee == rhptee)
John McCallaba90822011-01-31 23:13:11 +00005551 return Sema::IncompatibleNestedPointerQualifiers;
Fariborz Jahaniand7aa9d82009-11-07 20:20:40 +00005552 }
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00005553
Eli Friedman80160bd2009-03-22 23:59:44 +00005554 // General pointer incompatibility takes priority over qualifiers.
John McCallaba90822011-01-31 23:13:11 +00005555 return Sema::IncompatiblePointer;
Eli Friedman80160bd2009-03-22 23:59:44 +00005556 }
David Blaikiebbafb8a2012-03-11 07:00:24 +00005557 if (!S.getLangOpts().CPlusPlus &&
Fariborz Jahanian48c69102011-10-05 00:05:34 +00005558 S.IsNoReturnConversion(ltrans, rtrans, ltrans))
5559 return Sema::IncompatiblePointer;
Chris Lattner9bad62c2008-01-04 18:04:52 +00005560 return ConvTy;
Steve Naroff1f4d7272007-05-11 04:00:31 +00005561}
5562
John McCallaba90822011-01-31 23:13:11 +00005563/// checkBlockPointerTypesForAssignment - This routine determines whether two
Steve Naroff081c7422008-09-04 15:10:53 +00005564/// block pointer types are compatible or whether a block and normal pointer
5565/// are compatible. It is more restrict than comparing two function pointer
5566// types.
John McCallaba90822011-01-31 23:13:11 +00005567static Sema::AssignConvertType
Richard Trieua871b972011-09-06 20:21:22 +00005568checkBlockPointerTypesForAssignment(Sema &S, QualType LHSType,
5569 QualType RHSType) {
5570 assert(LHSType.isCanonical() && "LHS not canonicalized!");
5571 assert(RHSType.isCanonical() && "RHS not canonicalized!");
John McCallaba90822011-01-31 23:13:11 +00005572
Steve Naroff081c7422008-09-04 15:10:53 +00005573 QualType lhptee, rhptee;
Mike Stump4e1f26a2009-02-19 03:04:26 +00005574
Steve Naroff081c7422008-09-04 15:10:53 +00005575 // get the "pointed to" type (ignoring qualifiers at the top level)
Richard Trieua871b972011-09-06 20:21:22 +00005576 lhptee = cast<BlockPointerType>(LHSType)->getPointeeType();
5577 rhptee = cast<BlockPointerType>(RHSType)->getPointeeType();
Mike Stump4e1f26a2009-02-19 03:04:26 +00005578
John McCallaba90822011-01-31 23:13:11 +00005579 // In C++, the types have to match exactly.
David Blaikiebbafb8a2012-03-11 07:00:24 +00005580 if (S.getLangOpts().CPlusPlus)
John McCallaba90822011-01-31 23:13:11 +00005581 return Sema::IncompatibleBlockPointer;
Mike Stump4e1f26a2009-02-19 03:04:26 +00005582
John McCallaba90822011-01-31 23:13:11 +00005583 Sema::AssignConvertType ConvTy = Sema::Compatible;
Mike Stump4e1f26a2009-02-19 03:04:26 +00005584
Steve Naroff081c7422008-09-04 15:10:53 +00005585 // For blocks we enforce that qualifiers are identical.
John McCallaba90822011-01-31 23:13:11 +00005586 if (lhptee.getLocalQualifiers() != rhptee.getLocalQualifiers())
5587 ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
Mike Stump4e1f26a2009-02-19 03:04:26 +00005588
Richard Trieua871b972011-09-06 20:21:22 +00005589 if (!S.Context.typesAreBlockPointerCompatible(LHSType, RHSType))
John McCallaba90822011-01-31 23:13:11 +00005590 return Sema::IncompatibleBlockPointer;
5591
Steve Naroff081c7422008-09-04 15:10:53 +00005592 return ConvTy;
5593}
5594
John McCallaba90822011-01-31 23:13:11 +00005595/// checkObjCPointerTypesForAssignment - Compares two objective-c pointer types
Fariborz Jahanian410f2eb2009-12-08 18:24:49 +00005596/// for assignment compatibility.
John McCallaba90822011-01-31 23:13:11 +00005597static Sema::AssignConvertType
Richard Trieua871b972011-09-06 20:21:22 +00005598checkObjCPointerTypesForAssignment(Sema &S, QualType LHSType,
5599 QualType RHSType) {
5600 assert(LHSType.isCanonical() && "LHS was not canonicalized!");
5601 assert(RHSType.isCanonical() && "RHS was not canonicalized!");
John McCallaba90822011-01-31 23:13:11 +00005602
Richard Trieua871b972011-09-06 20:21:22 +00005603 if (LHSType->isObjCBuiltinType()) {
Fariborz Jahaniand5bb8cb2010-03-19 18:06:10 +00005604 // Class is not compatible with ObjC object pointers.
Richard Trieua871b972011-09-06 20:21:22 +00005605 if (LHSType->isObjCClassType() && !RHSType->isObjCBuiltinType() &&
5606 !RHSType->isObjCQualifiedClassType())
John McCallaba90822011-01-31 23:13:11 +00005607 return Sema::IncompatiblePointer;
5608 return Sema::Compatible;
Fariborz Jahaniand5bb8cb2010-03-19 18:06:10 +00005609 }
Richard Trieua871b972011-09-06 20:21:22 +00005610 if (RHSType->isObjCBuiltinType()) {
Richard Trieua871b972011-09-06 20:21:22 +00005611 if (RHSType->isObjCClassType() && !LHSType->isObjCBuiltinType() &&
5612 !LHSType->isObjCQualifiedClassType())
Fariborz Jahaniand923eb02011-09-15 20:40:18 +00005613 return Sema::IncompatiblePointer;
John McCallaba90822011-01-31 23:13:11 +00005614 return Sema::Compatible;
Fariborz Jahaniand5bb8cb2010-03-19 18:06:10 +00005615 }
Richard Trieua871b972011-09-06 20:21:22 +00005616 QualType lhptee = LHSType->getAs<ObjCObjectPointerType>()->getPointeeType();
5617 QualType rhptee = RHSType->getAs<ObjCObjectPointerType>()->getPointeeType();
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00005618
Fariborz Jahaniane74d47e2012-01-12 22:12:08 +00005619 if (!lhptee.isAtLeastAsQualifiedAs(rhptee) &&
5620 // make an exception for id<P>
5621 !LHSType->isObjCQualifiedIdType())
John McCallaba90822011-01-31 23:13:11 +00005622 return Sema::CompatiblePointerDiscardsQualifiers;
5623
Richard Trieua871b972011-09-06 20:21:22 +00005624 if (S.Context.typesAreCompatible(LHSType, RHSType))
John McCallaba90822011-01-31 23:13:11 +00005625 return Sema::Compatible;
Richard Trieua871b972011-09-06 20:21:22 +00005626 if (LHSType->isObjCQualifiedIdType() || RHSType->isObjCQualifiedIdType())
John McCallaba90822011-01-31 23:13:11 +00005627 return Sema::IncompatibleObjCQualifiedId;
5628 return Sema::IncompatiblePointer;
Fariborz Jahanian410f2eb2009-12-08 18:24:49 +00005629}
5630
John McCall29600e12010-11-16 02:32:08 +00005631Sema::AssignConvertType
Douglas Gregorc03a1082011-01-28 02:26:04 +00005632Sema::CheckAssignmentConstraints(SourceLocation Loc,
Richard Trieua871b972011-09-06 20:21:22 +00005633 QualType LHSType, QualType RHSType) {
John McCall29600e12010-11-16 02:32:08 +00005634 // Fake up an opaque expression. We don't actually care about what
5635 // cast operations are required, so if CheckAssignmentConstraints
5636 // adds casts to this they'll be wasted, but fortunately that doesn't
5637 // usually happen on valid code.
Richard Trieua871b972011-09-06 20:21:22 +00005638 OpaqueValueExpr RHSExpr(Loc, RHSType, VK_RValue);
5639 ExprResult RHSPtr = &RHSExpr;
John McCall29600e12010-11-16 02:32:08 +00005640 CastKind K = CK_Invalid;
5641
Richard Trieua871b972011-09-06 20:21:22 +00005642 return CheckAssignmentConstraints(LHSType, RHSPtr, K);
John McCall29600e12010-11-16 02:32:08 +00005643}
5644
Mike Stump4e1f26a2009-02-19 03:04:26 +00005645/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently
5646/// has code to accommodate several GCC extensions when type checking
Steve Naroff17f76e02007-05-03 21:03:48 +00005647/// pointers. Here are some objectionable examples that GCC considers warnings:
5648///
5649/// int a, *pint;
5650/// short *pshort;
5651/// struct foo *pfoo;
5652///
5653/// pint = pshort; // warning: assignment from incompatible pointer type
5654/// a = pint; // warning: assignment makes integer from pointer without a cast
5655/// pint = a; // warning: assignment makes pointer from integer without a cast
5656/// pint = pfoo; // warning: assignment from incompatible pointer type
5657///
5658/// As a result, the code for dealing with pointers is more complex than the
Mike Stump4e1f26a2009-02-19 03:04:26 +00005659/// C99 spec dictates.
Steve Naroff17f76e02007-05-03 21:03:48 +00005660///
John McCall8cb679e2010-11-15 09:13:47 +00005661/// Sets 'Kind' for any result kind except Incompatible.
Chris Lattner9bad62c2008-01-04 18:04:52 +00005662Sema::AssignConvertType
Richard Trieude4958f2011-09-06 20:30:53 +00005663Sema::CheckAssignmentConstraints(QualType LHSType, ExprResult &RHS,
John McCall8cb679e2010-11-15 09:13:47 +00005664 CastKind &Kind) {
Richard Trieude4958f2011-09-06 20:30:53 +00005665 QualType RHSType = RHS.get()->getType();
5666 QualType OrigLHSType = LHSType;
John McCall29600e12010-11-16 02:32:08 +00005667
Chris Lattnera52c2f22008-01-04 23:18:45 +00005668 // Get canonical types. We're not formatting these types, just comparing
5669 // them.
Richard Trieude4958f2011-09-06 20:30:53 +00005670 LHSType = Context.getCanonicalType(LHSType).getUnqualifiedType();
5671 RHSType = Context.getCanonicalType(RHSType).getUnqualifiedType();
Eli Friedman3360d892008-05-30 18:07:22 +00005672
John McCalle5255932011-01-31 22:28:28 +00005673 // Common case: no conversion required.
Richard Trieude4958f2011-09-06 20:30:53 +00005674 if (LHSType == RHSType) {
John McCall8cb679e2010-11-15 09:13:47 +00005675 Kind = CK_NoOp;
John McCall8cb679e2010-11-15 09:13:47 +00005676 return Compatible;
David Chisnall9f57c292009-08-17 16:35:33 +00005677 }
5678
Eli Friedman93ee5ca2012-06-16 02:19:17 +00005679 // If we have an atomic type, try a non-atomic assignment, then just add an
5680 // atomic qualification step.
David Chisnallfa35df62012-01-16 17:27:18 +00005681 if (const AtomicType *AtomicTy = dyn_cast<AtomicType>(LHSType)) {
Eli Friedman93ee5ca2012-06-16 02:19:17 +00005682 Sema::AssignConvertType result =
5683 CheckAssignmentConstraints(AtomicTy->getValueType(), RHS, Kind);
5684 if (result != Compatible)
5685 return result;
5686 if (Kind != CK_NoOp)
5687 RHS = ImpCastExprToType(RHS.take(), AtomicTy->getValueType(), Kind);
5688 Kind = CK_NonAtomicToAtomic;
5689 return Compatible;
David Chisnallfa35df62012-01-16 17:27:18 +00005690 }
5691
Douglas Gregor6b754842008-10-28 00:22:11 +00005692 // If the left-hand side is a reference type, then we are in a
5693 // (rare!) case where we've allowed the use of references in C,
5694 // e.g., as a parameter type in a built-in function. In this case,
5695 // just make sure that the type referenced is compatible with the
5696 // right-hand side type. The caller is responsible for adjusting
Richard Trieude4958f2011-09-06 20:30:53 +00005697 // LHSType so that the resulting expression does not have reference
Douglas Gregor6b754842008-10-28 00:22:11 +00005698 // type.
Richard Trieude4958f2011-09-06 20:30:53 +00005699 if (const ReferenceType *LHSTypeRef = LHSType->getAs<ReferenceType>()) {
5700 if (Context.typesAreCompatible(LHSTypeRef->getPointeeType(), RHSType)) {
John McCall8cb679e2010-11-15 09:13:47 +00005701 Kind = CK_LValueBitCast;
Anders Carlsson24ebce62007-10-12 23:56:29 +00005702 return Compatible;
John McCall8cb679e2010-11-15 09:13:47 +00005703 }
Chris Lattnera52c2f22008-01-04 23:18:45 +00005704 return Incompatible;
Fariborz Jahaniana1e34202007-12-19 17:45:58 +00005705 }
John McCalle5255932011-01-31 22:28:28 +00005706
Nate Begemanbd956c42009-06-28 02:36:38 +00005707 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type
5708 // to the same ExtVector type.
Richard Trieude4958f2011-09-06 20:30:53 +00005709 if (LHSType->isExtVectorType()) {
5710 if (RHSType->isExtVectorType())
John McCall8cb679e2010-11-15 09:13:47 +00005711 return Incompatible;
Richard Trieude4958f2011-09-06 20:30:53 +00005712 if (RHSType->isArithmeticType()) {
John McCall29600e12010-11-16 02:32:08 +00005713 // CK_VectorSplat does T -> vector T, so first cast to the
5714 // element type.
Richard Trieude4958f2011-09-06 20:30:53 +00005715 QualType elType = cast<ExtVectorType>(LHSType)->getElementType();
5716 if (elType != RHSType) {
John McCall9776e432011-10-06 23:25:11 +00005717 Kind = PrepareScalarCast(RHS, elType);
Richard Trieude4958f2011-09-06 20:30:53 +00005718 RHS = ImpCastExprToType(RHS.take(), elType, Kind);
John McCall29600e12010-11-16 02:32:08 +00005719 }
5720 Kind = CK_VectorSplat;
Nate Begemanbd956c42009-06-28 02:36:38 +00005721 return Compatible;
John McCall8cb679e2010-11-15 09:13:47 +00005722 }
Nate Begemanbd956c42009-06-28 02:36:38 +00005723 }
Mike Stump11289f42009-09-09 15:08:12 +00005724
John McCalle5255932011-01-31 22:28:28 +00005725 // Conversions to or from vector type.
Richard Trieude4958f2011-09-06 20:30:53 +00005726 if (LHSType->isVectorType() || RHSType->isVectorType()) {
5727 if (LHSType->isVectorType() && RHSType->isVectorType()) {
Bob Wilson01856f32010-12-02 00:25:15 +00005728 // Allow assignments of an AltiVec vector type to an equivalent GCC
5729 // vector type and vice versa
Richard Trieude4958f2011-09-06 20:30:53 +00005730 if (Context.areCompatibleVectorTypes(LHSType, RHSType)) {
Bob Wilson01856f32010-12-02 00:25:15 +00005731 Kind = CK_BitCast;
5732 return Compatible;
5733 }
5734
Douglas Gregor59e8b3b2010-08-06 10:14:59 +00005735 // If we are allowing lax vector conversions, and LHS and RHS are both
5736 // vectors, the total size only needs to be the same. This is a bitcast;
5737 // no bits are changed but the result type is different.
David Blaikiebbafb8a2012-03-11 07:00:24 +00005738 if (getLangOpts().LaxVectorConversions &&
Richard Trieude4958f2011-09-06 20:30:53 +00005739 (Context.getTypeSize(LHSType) == Context.getTypeSize(RHSType))) {
John McCall3065d042010-11-15 10:08:00 +00005740 Kind = CK_BitCast;
Anders Carlssondb5a9b62009-01-30 23:17:46 +00005741 return IncompatibleVectors;
John McCall8cb679e2010-11-15 09:13:47 +00005742 }
Chris Lattner881a2122008-01-04 23:32:24 +00005743 }
5744 return Incompatible;
Mike Stump4e1f26a2009-02-19 03:04:26 +00005745 }
Eli Friedman3360d892008-05-30 18:07:22 +00005746
John McCalle5255932011-01-31 22:28:28 +00005747 // Arithmetic conversions.
Richard Trieude4958f2011-09-06 20:30:53 +00005748 if (LHSType->isArithmeticType() && RHSType->isArithmeticType() &&
David Blaikiebbafb8a2012-03-11 07:00:24 +00005749 !(getLangOpts().CPlusPlus && LHSType->isEnumeralType())) {
John McCall9776e432011-10-06 23:25:11 +00005750 Kind = PrepareScalarCast(RHS, LHSType);
Steve Naroff98cf3e92007-06-06 18:38:38 +00005751 return Compatible;
John McCall8cb679e2010-11-15 09:13:47 +00005752 }
Eli Friedman3360d892008-05-30 18:07:22 +00005753
John McCalle5255932011-01-31 22:28:28 +00005754 // Conversions to normal pointers.
Richard Trieude4958f2011-09-06 20:30:53 +00005755 if (const PointerType *LHSPointer = dyn_cast<PointerType>(LHSType)) {
John McCalle5255932011-01-31 22:28:28 +00005756 // U* -> T*
Richard Trieude4958f2011-09-06 20:30:53 +00005757 if (isa<PointerType>(RHSType)) {
John McCall8cb679e2010-11-15 09:13:47 +00005758 Kind = CK_BitCast;
Richard Trieude4958f2011-09-06 20:30:53 +00005759 return checkPointerTypesForAssignment(*this, LHSType, RHSType);
John McCall8cb679e2010-11-15 09:13:47 +00005760 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00005761
John McCalle5255932011-01-31 22:28:28 +00005762 // int -> T*
Richard Trieude4958f2011-09-06 20:30:53 +00005763 if (RHSType->isIntegerType()) {
John McCalle5255932011-01-31 22:28:28 +00005764 Kind = CK_IntegralToPointer; // FIXME: null?
5765 return IntToPointer;
Steve Naroff7cae42b2009-07-10 23:34:53 +00005766 }
John McCalle5255932011-01-31 22:28:28 +00005767
5768 // C pointers are not compatible with ObjC object pointers,
5769 // with two exceptions:
Richard Trieude4958f2011-09-06 20:30:53 +00005770 if (isa<ObjCObjectPointerType>(RHSType)) {
John McCalle5255932011-01-31 22:28:28 +00005771 // - conversions to void*
Richard Trieude4958f2011-09-06 20:30:53 +00005772 if (LHSPointer->getPointeeType()->isVoidType()) {
John McCall9320b872011-09-09 05:25:32 +00005773 Kind = CK_BitCast;
John McCalle5255932011-01-31 22:28:28 +00005774 return Compatible;
5775 }
5776
5777 // - conversions from 'Class' to the redefinition type
Richard Trieude4958f2011-09-06 20:30:53 +00005778 if (RHSType->isObjCClassType() &&
5779 Context.hasSameType(LHSType,
Douglas Gregor97673472011-08-11 20:58:55 +00005780 Context.getObjCClassRedefinitionType())) {
John McCall8cb679e2010-11-15 09:13:47 +00005781 Kind = CK_BitCast;
Douglas Gregore7dd1452008-11-27 00:44:28 +00005782 return Compatible;
John McCall8cb679e2010-11-15 09:13:47 +00005783 }
Douglas Gregor486b74e2011-09-27 16:10:05 +00005784
John McCalle5255932011-01-31 22:28:28 +00005785 Kind = CK_BitCast;
5786 return IncompatiblePointer;
5787 }
5788
5789 // U^ -> void*
Richard Trieude4958f2011-09-06 20:30:53 +00005790 if (RHSType->getAs<BlockPointerType>()) {
5791 if (LHSPointer->getPointeeType()->isVoidType()) {
John McCalle5255932011-01-31 22:28:28 +00005792 Kind = CK_BitCast;
Steve Naroff32d072c2008-09-29 18:10:17 +00005793 return Compatible;
John McCall8cb679e2010-11-15 09:13:47 +00005794 }
Steve Naroff32d072c2008-09-29 18:10:17 +00005795 }
John McCalle5255932011-01-31 22:28:28 +00005796
Steve Naroff081c7422008-09-04 15:10:53 +00005797 return Incompatible;
5798 }
5799
John McCalle5255932011-01-31 22:28:28 +00005800 // Conversions to block pointers.
Richard Trieude4958f2011-09-06 20:30:53 +00005801 if (isa<BlockPointerType>(LHSType)) {
John McCalle5255932011-01-31 22:28:28 +00005802 // U^ -> T^
Richard Trieude4958f2011-09-06 20:30:53 +00005803 if (RHSType->isBlockPointerType()) {
John McCall9320b872011-09-09 05:25:32 +00005804 Kind = CK_BitCast;
Richard Trieude4958f2011-09-06 20:30:53 +00005805 return checkBlockPointerTypesForAssignment(*this, LHSType, RHSType);
John McCalle5255932011-01-31 22:28:28 +00005806 }
5807
5808 // int or null -> T^
Richard Trieude4958f2011-09-06 20:30:53 +00005809 if (RHSType->isIntegerType()) {
John McCall8cb679e2010-11-15 09:13:47 +00005810 Kind = CK_IntegralToPointer; // FIXME: null
Eli Friedman8163b7a2009-02-25 04:20:42 +00005811 return IntToBlockPointer;
John McCall8cb679e2010-11-15 09:13:47 +00005812 }
5813
John McCalle5255932011-01-31 22:28:28 +00005814 // id -> T^
David Blaikiebbafb8a2012-03-11 07:00:24 +00005815 if (getLangOpts().ObjC1 && RHSType->isObjCIdType()) {
John McCalle5255932011-01-31 22:28:28 +00005816 Kind = CK_AnyPointerToBlockPointerCast;
Steve Naroff32d072c2008-09-29 18:10:17 +00005817 return Compatible;
John McCalle5255932011-01-31 22:28:28 +00005818 }
Steve Naroff32d072c2008-09-29 18:10:17 +00005819
John McCalle5255932011-01-31 22:28:28 +00005820 // void* -> T^
Richard Trieude4958f2011-09-06 20:30:53 +00005821 if (const PointerType *RHSPT = RHSType->getAs<PointerType>())
John McCalle5255932011-01-31 22:28:28 +00005822 if (RHSPT->getPointeeType()->isVoidType()) {
5823 Kind = CK_AnyPointerToBlockPointerCast;
Douglas Gregore7dd1452008-11-27 00:44:28 +00005824 return Compatible;
John McCalle5255932011-01-31 22:28:28 +00005825 }
John McCall8cb679e2010-11-15 09:13:47 +00005826
Chris Lattnera52c2f22008-01-04 23:18:45 +00005827 return Incompatible;
5828 }
5829
John McCalle5255932011-01-31 22:28:28 +00005830 // Conversions to Objective-C pointers.
Richard Trieude4958f2011-09-06 20:30:53 +00005831 if (isa<ObjCObjectPointerType>(LHSType)) {
John McCalle5255932011-01-31 22:28:28 +00005832 // A* -> B*
Richard Trieude4958f2011-09-06 20:30:53 +00005833 if (RHSType->isObjCObjectPointerType()) {
John McCalle5255932011-01-31 22:28:28 +00005834 Kind = CK_BitCast;
Fariborz Jahanian6f472e82011-07-07 18:55:47 +00005835 Sema::AssignConvertType result =
Richard Trieude4958f2011-09-06 20:30:53 +00005836 checkObjCPointerTypesForAssignment(*this, LHSType, RHSType);
David Blaikiebbafb8a2012-03-11 07:00:24 +00005837 if (getLangOpts().ObjCAutoRefCount &&
Fariborz Jahanian6f472e82011-07-07 18:55:47 +00005838 result == Compatible &&
Richard Trieude4958f2011-09-06 20:30:53 +00005839 !CheckObjCARCUnavailableWeakConversion(OrigLHSType, RHSType))
Fariborz Jahanian7fcce682011-07-07 23:04:17 +00005840 result = IncompatibleObjCWeakRef;
Fariborz Jahanian6f472e82011-07-07 18:55:47 +00005841 return result;
John McCalle5255932011-01-31 22:28:28 +00005842 }
5843
5844 // int or null -> A*
Richard Trieude4958f2011-09-06 20:30:53 +00005845 if (RHSType->isIntegerType()) {
John McCall8cb679e2010-11-15 09:13:47 +00005846 Kind = CK_IntegralToPointer; // FIXME: null
Steve Naroff7cae42b2009-07-10 23:34:53 +00005847 return IntToPointer;
John McCall8cb679e2010-11-15 09:13:47 +00005848 }
5849
John McCalle5255932011-01-31 22:28:28 +00005850 // In general, C pointers are not compatible with ObjC object pointers,
5851 // with two exceptions:
Richard Trieude4958f2011-09-06 20:30:53 +00005852 if (isa<PointerType>(RHSType)) {
John McCall9320b872011-09-09 05:25:32 +00005853 Kind = CK_CPointerToObjCPointerCast;
5854
John McCalle5255932011-01-31 22:28:28 +00005855 // - conversions from 'void*'
Richard Trieude4958f2011-09-06 20:30:53 +00005856 if (RHSType->isVoidPointerType()) {
Steve Naroffaccc4882009-07-20 17:56:53 +00005857 return Compatible;
John McCalle5255932011-01-31 22:28:28 +00005858 }
5859
5860 // - conversions to 'Class' from its redefinition type
Richard Trieude4958f2011-09-06 20:30:53 +00005861 if (LHSType->isObjCClassType() &&
5862 Context.hasSameType(RHSType,
Douglas Gregor97673472011-08-11 20:58:55 +00005863 Context.getObjCClassRedefinitionType())) {
John McCalle5255932011-01-31 22:28:28 +00005864 return Compatible;
5865 }
5866
Steve Naroffaccc4882009-07-20 17:56:53 +00005867 return IncompatiblePointer;
Steve Naroff7cae42b2009-07-10 23:34:53 +00005868 }
John McCalle5255932011-01-31 22:28:28 +00005869
5870 // T^ -> A*
Richard Trieude4958f2011-09-06 20:30:53 +00005871 if (RHSType->isBlockPointerType()) {
John McCallcd78e802011-09-10 01:16:55 +00005872 maybeExtendBlockObject(*this, RHS);
John McCall9320b872011-09-09 05:25:32 +00005873 Kind = CK_BlockPointerToObjCPointerCast;
Steve Naroff7cae42b2009-07-10 23:34:53 +00005874 return Compatible;
John McCalle5255932011-01-31 22:28:28 +00005875 }
5876
Steve Naroff7cae42b2009-07-10 23:34:53 +00005877 return Incompatible;
5878 }
John McCalle5255932011-01-31 22:28:28 +00005879
5880 // Conversions from pointers that are not covered by the above.
Richard Trieude4958f2011-09-06 20:30:53 +00005881 if (isa<PointerType>(RHSType)) {
John McCalle5255932011-01-31 22:28:28 +00005882 // T* -> _Bool
Richard Trieude4958f2011-09-06 20:30:53 +00005883 if (LHSType == Context.BoolTy) {
John McCall8cb679e2010-11-15 09:13:47 +00005884 Kind = CK_PointerToBoolean;
Eli Friedman3360d892008-05-30 18:07:22 +00005885 return Compatible;
John McCall8cb679e2010-11-15 09:13:47 +00005886 }
Eli Friedman3360d892008-05-30 18:07:22 +00005887
John McCalle5255932011-01-31 22:28:28 +00005888 // T* -> int
Richard Trieude4958f2011-09-06 20:30:53 +00005889 if (LHSType->isIntegerType()) {
John McCall8cb679e2010-11-15 09:13:47 +00005890 Kind = CK_PointerToIntegral;
Chris Lattner940cfeb2008-01-04 18:22:42 +00005891 return PointerToInt;
John McCall8cb679e2010-11-15 09:13:47 +00005892 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00005893
Chris Lattnera52c2f22008-01-04 23:18:45 +00005894 return Incompatible;
Chris Lattnera52c2f22008-01-04 23:18:45 +00005895 }
John McCalle5255932011-01-31 22:28:28 +00005896
5897 // Conversions from Objective-C pointers that are not covered by the above.
Richard Trieude4958f2011-09-06 20:30:53 +00005898 if (isa<ObjCObjectPointerType>(RHSType)) {
John McCalle5255932011-01-31 22:28:28 +00005899 // T* -> _Bool
Richard Trieude4958f2011-09-06 20:30:53 +00005900 if (LHSType == Context.BoolTy) {
John McCall8cb679e2010-11-15 09:13:47 +00005901 Kind = CK_PointerToBoolean;
Steve Naroff7cae42b2009-07-10 23:34:53 +00005902 return Compatible;
John McCall8cb679e2010-11-15 09:13:47 +00005903 }
Steve Naroff7cae42b2009-07-10 23:34:53 +00005904
John McCalle5255932011-01-31 22:28:28 +00005905 // T* -> int
Richard Trieude4958f2011-09-06 20:30:53 +00005906 if (LHSType->isIntegerType()) {
John McCall8cb679e2010-11-15 09:13:47 +00005907 Kind = CK_PointerToIntegral;
Steve Naroff7cae42b2009-07-10 23:34:53 +00005908 return PointerToInt;
John McCall8cb679e2010-11-15 09:13:47 +00005909 }
5910
Steve Naroff7cae42b2009-07-10 23:34:53 +00005911 return Incompatible;
5912 }
Eli Friedman3360d892008-05-30 18:07:22 +00005913
John McCalle5255932011-01-31 22:28:28 +00005914 // struct A -> struct B
Richard Trieude4958f2011-09-06 20:30:53 +00005915 if (isa<TagType>(LHSType) && isa<TagType>(RHSType)) {
5916 if (Context.typesAreCompatible(LHSType, RHSType)) {
John McCall8cb679e2010-11-15 09:13:47 +00005917 Kind = CK_NoOp;
Steve Naroff98cf3e92007-06-06 18:38:38 +00005918 return Compatible;
John McCall8cb679e2010-11-15 09:13:47 +00005919 }
Bill Wendling216423b2007-05-30 06:30:29 +00005920 }
John McCalle5255932011-01-31 22:28:28 +00005921
Steve Naroff98cf3e92007-06-06 18:38:38 +00005922 return Incompatible;
Steve Naroff9eb24652007-05-02 21:58:15 +00005923}
5924
Douglas Gregor0cfbdab2009-04-29 22:16:16 +00005925/// \brief Constructs a transparent union from an expression that is
5926/// used to initialize the transparent union.
Richard Trieucfc491d2011-08-02 04:35:43 +00005927static void ConstructTransparentUnion(Sema &S, ASTContext &C,
5928 ExprResult &EResult, QualType UnionType,
5929 FieldDecl *Field) {
Douglas Gregor0cfbdab2009-04-29 22:16:16 +00005930 // Build an initializer list that designates the appropriate member
5931 // of the transparent union.
John Wiegley01296292011-04-08 18:41:53 +00005932 Expr *E = EResult.take();
Ted Kremenekac034612010-04-13 23:39:13 +00005933 InitListExpr *Initializer = new (C) InitListExpr(C, SourceLocation(),
Benjamin Kramerc215e762012-08-24 11:54:20 +00005934 E, SourceLocation());
Douglas Gregor0cfbdab2009-04-29 22:16:16 +00005935 Initializer->setType(UnionType);
5936 Initializer->setInitializedFieldInUnion(Field);
5937
5938 // Build a compound literal constructing a value of the transparent
5939 // union type from this initializer list.
John McCalle15bbff2010-01-18 19:35:47 +00005940 TypeSourceInfo *unionTInfo = C.getTrivialTypeSourceInfo(UnionType);
John Wiegley01296292011-04-08 18:41:53 +00005941 EResult = S.Owned(
5942 new (C) CompoundLiteralExpr(SourceLocation(), unionTInfo, UnionType,
5943 VK_RValue, Initializer, false));
Douglas Gregor0cfbdab2009-04-29 22:16:16 +00005944}
5945
5946Sema::AssignConvertType
Richard Trieucfc491d2011-08-02 04:35:43 +00005947Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType,
Richard Trieueb299142011-09-06 20:40:12 +00005948 ExprResult &RHS) {
5949 QualType RHSType = RHS.get()->getType();
Douglas Gregor0cfbdab2009-04-29 22:16:16 +00005950
Mike Stump11289f42009-09-09 15:08:12 +00005951 // If the ArgType is a Union type, we want to handle a potential
Douglas Gregor0cfbdab2009-04-29 22:16:16 +00005952 // transparent_union GCC extension.
5953 const RecordType *UT = ArgType->getAsUnionType();
Argyrios Kyrtzidisb4b64ca2009-06-30 02:34:44 +00005954 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>())
Douglas Gregor0cfbdab2009-04-29 22:16:16 +00005955 return Incompatible;
5956
5957 // The field to initialize within the transparent union.
5958 RecordDecl *UD = UT->getDecl();
5959 FieldDecl *InitField = 0;
5960 // It's compatible if the expression matches any of the fields.
Argyrios Kyrtzidiscfbfe782009-06-30 02:36:12 +00005961 for (RecordDecl::field_iterator it = UD->field_begin(),
5962 itend = UD->field_end();
Douglas Gregor0cfbdab2009-04-29 22:16:16 +00005963 it != itend; ++it) {
5964 if (it->getType()->isPointerType()) {
5965 // If the transparent union contains a pointer type, we allow:
5966 // 1) void pointer
5967 // 2) null pointer constant
Richard Trieueb299142011-09-06 20:40:12 +00005968 if (RHSType->isPointerType())
John McCall9320b872011-09-09 05:25:32 +00005969 if (RHSType->castAs<PointerType>()->getPointeeType()->isVoidType()) {
Richard Trieueb299142011-09-06 20:40:12 +00005970 RHS = ImpCastExprToType(RHS.take(), it->getType(), CK_BitCast);
David Blaikie40ed2972012-06-06 20:45:41 +00005971 InitField = *it;
Douglas Gregor0cfbdab2009-04-29 22:16:16 +00005972 break;
5973 }
Mike Stump11289f42009-09-09 15:08:12 +00005974
Richard Trieueb299142011-09-06 20:40:12 +00005975 if (RHS.get()->isNullPointerConstant(Context,
5976 Expr::NPC_ValueDependentIsNull)) {
5977 RHS = ImpCastExprToType(RHS.take(), it->getType(),
5978 CK_NullToPointer);
David Blaikie40ed2972012-06-06 20:45:41 +00005979 InitField = *it;
Douglas Gregor0cfbdab2009-04-29 22:16:16 +00005980 break;
5981 }
5982 }
5983
John McCall8cb679e2010-11-15 09:13:47 +00005984 CastKind Kind = CK_Invalid;
Richard Trieueb299142011-09-06 20:40:12 +00005985 if (CheckAssignmentConstraints(it->getType(), RHS, Kind)
Douglas Gregor0cfbdab2009-04-29 22:16:16 +00005986 == Compatible) {
Richard Trieueb299142011-09-06 20:40:12 +00005987 RHS = ImpCastExprToType(RHS.take(), it->getType(), Kind);
David Blaikie40ed2972012-06-06 20:45:41 +00005988 InitField = *it;
Douglas Gregor0cfbdab2009-04-29 22:16:16 +00005989 break;
5990 }
5991 }
5992
5993 if (!InitField)
5994 return Incompatible;
5995
Richard Trieueb299142011-09-06 20:40:12 +00005996 ConstructTransparentUnion(*this, Context, RHS, ArgType, InitField);
Douglas Gregor0cfbdab2009-04-29 22:16:16 +00005997 return Compatible;
5998}
5999
Chris Lattner9bad62c2008-01-04 18:04:52 +00006000Sema::AssignConvertType
Sebastian Redlb49c46c2011-09-24 17:48:00 +00006001Sema::CheckSingleAssignmentConstraints(QualType LHSType, ExprResult &RHS,
6002 bool Diagnose) {
David Blaikiebbafb8a2012-03-11 07:00:24 +00006003 if (getLangOpts().CPlusPlus) {
Eli Friedman0dfb8892011-10-06 23:00:33 +00006004 if (!LHSType->isRecordType() && !LHSType->isAtomicType()) {
Douglas Gregor9a657932008-10-21 23:43:52 +00006005 // C++ 5.17p3: If the left operand is not of class type, the
6006 // expression is implicitly converted (C++ 4) to the
6007 // cv-unqualified type of the left operand.
Sebastian Redlcc152642011-10-16 18:19:06 +00006008 ExprResult Res;
6009 if (Diagnose) {
6010 Res = PerformImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
6011 AA_Assigning);
6012 } else {
6013 ImplicitConversionSequence ICS =
6014 TryImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
6015 /*SuppressUserConversions=*/false,
6016 /*AllowExplicit=*/false,
6017 /*InOverloadResolution=*/false,
6018 /*CStyle=*/false,
6019 /*AllowObjCWritebackConversion=*/false);
6020 if (ICS.isFailure())
6021 return Incompatible;
6022 Res = PerformImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
6023 ICS, AA_Assigning);
6024 }
John Wiegley01296292011-04-08 18:41:53 +00006025 if (Res.isInvalid())
Douglas Gregor9a657932008-10-21 23:43:52 +00006026 return Incompatible;
Fariborz Jahanian7fcce682011-07-07 23:04:17 +00006027 Sema::AssignConvertType result = Compatible;
David Blaikiebbafb8a2012-03-11 07:00:24 +00006028 if (getLangOpts().ObjCAutoRefCount &&
Richard Trieueb299142011-09-06 20:40:12 +00006029 !CheckObjCARCUnavailableWeakConversion(LHSType,
6030 RHS.get()->getType()))
Fariborz Jahanian7fcce682011-07-07 23:04:17 +00006031 result = IncompatibleObjCWeakRef;
Benjamin Kramer62b95d82012-08-23 21:35:17 +00006032 RHS = Res;
Fariborz Jahanian7fcce682011-07-07 23:04:17 +00006033 return result;
Douglas Gregor9a657932008-10-21 23:43:52 +00006034 }
6035
6036 // FIXME: Currently, we fall through and treat C++ classes like C
6037 // structures.
Eli Friedman0dfb8892011-10-06 23:00:33 +00006038 // FIXME: We also fall through for atomics; not sure what should
6039 // happen there, though.
Sebastian Redlb49c46c2011-09-24 17:48:00 +00006040 }
Douglas Gregor9a657932008-10-21 23:43:52 +00006041
Steve Naroff0ee0b0a2007-11-27 17:58:44 +00006042 // C99 6.5.16.1p1: the left operand is a pointer and the right is
6043 // a null pointer constant.
Richard Trieueb299142011-09-06 20:40:12 +00006044 if ((LHSType->isPointerType() ||
6045 LHSType->isObjCObjectPointerType() ||
6046 LHSType->isBlockPointerType())
6047 && RHS.get()->isNullPointerConstant(Context,
6048 Expr::NPC_ValueDependentIsNull)) {
6049 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_NullToPointer);
Steve Naroff0ee0b0a2007-11-27 17:58:44 +00006050 return Compatible;
6051 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00006052
Chris Lattnere6dcd502007-10-16 02:55:40 +00006053 // This check seems unnatural, however it is necessary to ensure the proper
Steve Naroffb8ea4fb2007-07-13 23:32:42 +00006054 // conversion of functions/arrays. If the conversion were done for all
Douglas Gregora121b752009-11-03 16:56:39 +00006055 // DeclExpr's (created by ActOnIdExpression), it would mess up the unary
Nick Lewyckyef7c0ff2010-08-05 06:27:49 +00006056 // expressions that suppress this implicit conversion (&, sizeof).
Chris Lattnere6dcd502007-10-16 02:55:40 +00006057 //
Mike Stump4e1f26a2009-02-19 03:04:26 +00006058 // Suppress this for references: C++ 8.5.3p5.
Richard Trieueb299142011-09-06 20:40:12 +00006059 if (!LHSType->isReferenceType()) {
6060 RHS = DefaultFunctionArrayLvalueConversion(RHS.take());
6061 if (RHS.isInvalid())
John Wiegley01296292011-04-08 18:41:53 +00006062 return Incompatible;
6063 }
Steve Naroff0c1c7ed2007-08-24 22:33:52 +00006064
John McCall8cb679e2010-11-15 09:13:47 +00006065 CastKind Kind = CK_Invalid;
Chris Lattner9bad62c2008-01-04 18:04:52 +00006066 Sema::AssignConvertType result =
Richard Trieueb299142011-09-06 20:40:12 +00006067 CheckAssignmentConstraints(LHSType, RHS, Kind);
Mike Stump4e1f26a2009-02-19 03:04:26 +00006068
Steve Naroff0c1c7ed2007-08-24 22:33:52 +00006069 // C99 6.5.16.1p2: The value of the right operand is converted to the
6070 // type of the assignment expression.
Douglas Gregor6b754842008-10-28 00:22:11 +00006071 // CheckAssignmentConstraints allows the left-hand side to be a reference,
6072 // so that we can use references in built-in functions even in C.
6073 // The getNonReferenceType() call makes sure that the resulting expression
6074 // does not have reference type.
Richard Trieueb299142011-09-06 20:40:12 +00006075 if (result != Incompatible && RHS.get()->getType() != LHSType)
6076 RHS = ImpCastExprToType(RHS.take(),
6077 LHSType.getNonLValueExprType(Context), Kind);
Steve Naroff0c1c7ed2007-08-24 22:33:52 +00006078 return result;
Steve Naroffb8ea4fb2007-07-13 23:32:42 +00006079}
6080
Richard Trieueb299142011-09-06 20:40:12 +00006081QualType Sema::InvalidOperands(SourceLocation Loc, ExprResult &LHS,
6082 ExprResult &RHS) {
Chris Lattner377d1f82008-11-18 22:52:51 +00006083 Diag(Loc, diag::err_typecheck_invalid_operands)
Richard Trieueb299142011-09-06 20:40:12 +00006084 << LHS.get()->getType() << RHS.get()->getType()
6085 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Chris Lattner5c11c412007-12-12 05:47:28 +00006086 return QualType();
Steve Naroff6f49f5d2007-05-29 14:23:36 +00006087}
6088
Richard Trieu859d23f2011-09-06 21:01:04 +00006089QualType Sema::CheckVectorOperands(ExprResult &LHS, ExprResult &RHS,
Richard Trieuba63ce62011-09-09 01:45:06 +00006090 SourceLocation Loc, bool IsCompAssign) {
Richard Smith508ebf32011-10-28 03:31:48 +00006091 if (!IsCompAssign) {
6092 LHS = DefaultFunctionArrayLvalueConversion(LHS.take());
6093 if (LHS.isInvalid())
6094 return QualType();
6095 }
6096 RHS = DefaultFunctionArrayLvalueConversion(RHS.take());
6097 if (RHS.isInvalid())
6098 return QualType();
6099
Mike Stump4e1f26a2009-02-19 03:04:26 +00006100 // For conversion purposes, we ignore any qualifiers.
Nate Begeman002e4bd2008-04-04 01:30:25 +00006101 // For example, "const float" and "float" are equivalent.
Richard Trieu859d23f2011-09-06 21:01:04 +00006102 QualType LHSType =
6103 Context.getCanonicalType(LHS.get()->getType()).getUnqualifiedType();
6104 QualType RHSType =
6105 Context.getCanonicalType(RHS.get()->getType()).getUnqualifiedType();
Mike Stump4e1f26a2009-02-19 03:04:26 +00006106
Nate Begeman191a6b12008-07-14 18:02:46 +00006107 // If the vector types are identical, return.
Richard Trieu859d23f2011-09-06 21:01:04 +00006108 if (LHSType == RHSType)
6109 return LHSType;
Nate Begeman330aaa72007-12-30 02:59:45 +00006110
Douglas Gregor59e8b3b2010-08-06 10:14:59 +00006111 // Handle the case of equivalent AltiVec and GCC vector types
Richard Trieu859d23f2011-09-06 21:01:04 +00006112 if (LHSType->isVectorType() && RHSType->isVectorType() &&
6113 Context.areCompatibleVectorTypes(LHSType, RHSType)) {
6114 if (LHSType->isExtVectorType()) {
6115 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
6116 return LHSType;
Eli Friedman1408bc92011-06-23 18:10:35 +00006117 }
6118
Richard Trieuba63ce62011-09-09 01:45:06 +00006119 if (!IsCompAssign)
Richard Trieu859d23f2011-09-06 21:01:04 +00006120 LHS = ImpCastExprToType(LHS.take(), RHSType, CK_BitCast);
6121 return RHSType;
Douglas Gregor59e8b3b2010-08-06 10:14:59 +00006122 }
6123
David Blaikiebbafb8a2012-03-11 07:00:24 +00006124 if (getLangOpts().LaxVectorConversions &&
Richard Trieu859d23f2011-09-06 21:01:04 +00006125 Context.getTypeSize(LHSType) == Context.getTypeSize(RHSType)) {
Eli Friedman1408bc92011-06-23 18:10:35 +00006126 // If we are allowing lax vector conversions, and LHS and RHS are both
6127 // vectors, the total size only needs to be the same. This is a
6128 // bitcast; no bits are changed but the result type is different.
6129 // FIXME: Should we really be allowing this?
Richard Trieu859d23f2011-09-06 21:01:04 +00006130 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
6131 return LHSType;
Eli Friedman1408bc92011-06-23 18:10:35 +00006132 }
6133
Nate Begemanbd956c42009-06-28 02:36:38 +00006134 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can
6135 // swap back (so that we don't reverse the inputs to a subtract, for instance.
6136 bool swapped = false;
Richard Trieuba63ce62011-09-09 01:45:06 +00006137 if (RHSType->isExtVectorType() && !IsCompAssign) {
Nate Begemanbd956c42009-06-28 02:36:38 +00006138 swapped = true;
Richard Trieu859d23f2011-09-06 21:01:04 +00006139 std::swap(RHS, LHS);
6140 std::swap(RHSType, LHSType);
Nate Begemanbd956c42009-06-28 02:36:38 +00006141 }
Mike Stump11289f42009-09-09 15:08:12 +00006142
Nate Begeman886448d2009-06-28 19:12:57 +00006143 // Handle the case of an ext vector and scalar.
Richard Trieu859d23f2011-09-06 21:01:04 +00006144 if (const ExtVectorType *LV = LHSType->getAs<ExtVectorType>()) {
Nate Begemanbd956c42009-06-28 02:36:38 +00006145 QualType EltTy = LV->getElementType();
Richard Trieu859d23f2011-09-06 21:01:04 +00006146 if (EltTy->isIntegralType(Context) && RHSType->isIntegralType(Context)) {
6147 int order = Context.getIntegerTypeOrder(EltTy, RHSType);
John McCall8cb679e2010-11-15 09:13:47 +00006148 if (order > 0)
Richard Trieu859d23f2011-09-06 21:01:04 +00006149 RHS = ImpCastExprToType(RHS.take(), EltTy, CK_IntegralCast);
John McCall8cb679e2010-11-15 09:13:47 +00006150 if (order >= 0) {
Richard Trieu859d23f2011-09-06 21:01:04 +00006151 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_VectorSplat);
6152 if (swapped) std::swap(RHS, LHS);
6153 return LHSType;
Nate Begemanbd956c42009-06-28 02:36:38 +00006154 }
6155 }
Richard Trieu859d23f2011-09-06 21:01:04 +00006156 if (EltTy->isRealFloatingType() && RHSType->isScalarType() &&
6157 RHSType->isRealFloatingType()) {
6158 int order = Context.getFloatingTypeOrder(EltTy, RHSType);
John McCall8cb679e2010-11-15 09:13:47 +00006159 if (order > 0)
Richard Trieu859d23f2011-09-06 21:01:04 +00006160 RHS = ImpCastExprToType(RHS.take(), EltTy, CK_FloatingCast);
John McCall8cb679e2010-11-15 09:13:47 +00006161 if (order >= 0) {
Richard Trieu859d23f2011-09-06 21:01:04 +00006162 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_VectorSplat);
6163 if (swapped) std::swap(RHS, LHS);
6164 return LHSType;
Nate Begemanbd956c42009-06-28 02:36:38 +00006165 }
Nate Begeman330aaa72007-12-30 02:59:45 +00006166 }
6167 }
Mike Stump11289f42009-09-09 15:08:12 +00006168
Nate Begeman886448d2009-06-28 19:12:57 +00006169 // Vectors of different size or scalar and non-ext-vector are errors.
Richard Trieu859d23f2011-09-06 21:01:04 +00006170 if (swapped) std::swap(RHS, LHS);
Chris Lattner377d1f82008-11-18 22:52:51 +00006171 Diag(Loc, diag::err_typecheck_vector_not_convertable)
Richard Trieu859d23f2011-09-06 21:01:04 +00006172 << LHS.get()->getType() << RHS.get()->getType()
6173 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Steve Naroff84ff4b42007-07-09 21:31:10 +00006174 return QualType();
Sebastian Redl112a97662009-02-07 00:15:38 +00006175}
6176
Richard Trieuf8916e12011-09-16 00:53:10 +00006177// checkArithmeticNull - Detect when a NULL constant is used improperly in an
6178// expression. These are mainly cases where the null pointer is used as an
6179// integer instead of a pointer.
6180static void checkArithmeticNull(Sema &S, ExprResult &LHS, ExprResult &RHS,
6181 SourceLocation Loc, bool IsCompare) {
6182 // The canonical way to check for a GNU null is with isNullPointerConstant,
6183 // but we use a bit of a hack here for speed; this is a relatively
6184 // hot path, and isNullPointerConstant is slow.
6185 bool LHSNull = isa<GNUNullExpr>(LHS.get()->IgnoreParenImpCasts());
6186 bool RHSNull = isa<GNUNullExpr>(RHS.get()->IgnoreParenImpCasts());
6187
6188 QualType NonNullType = LHSNull ? RHS.get()->getType() : LHS.get()->getType();
6189
6190 // Avoid analyzing cases where the result will either be invalid (and
6191 // diagnosed as such) or entirely valid and not something to warn about.
6192 if ((!LHSNull && !RHSNull) || NonNullType->isBlockPointerType() ||
6193 NonNullType->isMemberPointerType() || NonNullType->isFunctionType())
6194 return;
6195
6196 // Comparison operations would not make sense with a null pointer no matter
6197 // what the other expression is.
6198 if (!IsCompare) {
6199 S.Diag(Loc, diag::warn_null_in_arithmetic_operation)
6200 << (LHSNull ? LHS.get()->getSourceRange() : SourceRange())
6201 << (RHSNull ? RHS.get()->getSourceRange() : SourceRange());
6202 return;
6203 }
6204
6205 // The rest of the operations only make sense with a null pointer
6206 // if the other expression is a pointer.
6207 if (LHSNull == RHSNull || NonNullType->isAnyPointerType() ||
6208 NonNullType->canDecayToPointerType())
6209 return;
6210
6211 S.Diag(Loc, diag::warn_null_in_comparison_operation)
6212 << LHSNull /* LHS is NULL */ << NonNullType
6213 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
6214}
6215
Richard Trieu859d23f2011-09-06 21:01:04 +00006216QualType Sema::CheckMultiplyDivideOperands(ExprResult &LHS, ExprResult &RHS,
Richard Trieucfc491d2011-08-02 04:35:43 +00006217 SourceLocation Loc,
Richard Trieuba63ce62011-09-09 01:45:06 +00006218 bool IsCompAssign, bool IsDiv) {
Richard Trieuf8916e12011-09-16 00:53:10 +00006219 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
6220
Richard Trieu859d23f2011-09-06 21:01:04 +00006221 if (LHS.get()->getType()->isVectorType() ||
6222 RHS.get()->getType()->isVectorType())
Richard Trieuba63ce62011-09-09 01:45:06 +00006223 return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign);
Mike Stump4e1f26a2009-02-19 03:04:26 +00006224
Richard Trieuba63ce62011-09-09 01:45:06 +00006225 QualType compType = UsualArithmeticConversions(LHS, RHS, IsCompAssign);
Richard Trieu859d23f2011-09-06 21:01:04 +00006226 if (LHS.isInvalid() || RHS.isInvalid())
John Wiegley01296292011-04-08 18:41:53 +00006227 return QualType();
Mike Stump4e1f26a2009-02-19 03:04:26 +00006228
David Chisnallfa35df62012-01-16 17:27:18 +00006229
Eli Friedman93ee5ca2012-06-16 02:19:17 +00006230 if (compType.isNull() || !compType->isArithmeticType())
Richard Trieu859d23f2011-09-06 21:01:04 +00006231 return InvalidOperands(Loc, LHS, RHS);
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00006232
Chris Lattnerfaa54172010-01-12 21:23:57 +00006233 // Check for division by zero.
Richard Trieuba63ce62011-09-09 01:45:06 +00006234 if (IsDiv &&
Richard Trieu859d23f2011-09-06 21:01:04 +00006235 RHS.get()->isNullPointerConstant(Context,
Richard Trieucfc491d2011-08-02 04:35:43 +00006236 Expr::NPC_ValueDependentIsNotNull))
Richard Trieu859d23f2011-09-06 21:01:04 +00006237 DiagRuntimeBehavior(Loc, RHS.get(), PDiag(diag::warn_division_by_zero)
6238 << RHS.get()->getSourceRange());
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00006239
Chris Lattnerfaa54172010-01-12 21:23:57 +00006240 return compType;
Steve Naroff26c8ea52007-03-21 21:08:52 +00006241}
6242
Chris Lattnerfaa54172010-01-12 21:23:57 +00006243QualType Sema::CheckRemainderOperands(
Richard Trieuba63ce62011-09-09 01:45:06 +00006244 ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign) {
Richard Trieuf8916e12011-09-16 00:53:10 +00006245 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
6246
Richard Trieu859d23f2011-09-06 21:01:04 +00006247 if (LHS.get()->getType()->isVectorType() ||
6248 RHS.get()->getType()->isVectorType()) {
6249 if (LHS.get()->getType()->hasIntegerRepresentation() &&
6250 RHS.get()->getType()->hasIntegerRepresentation())
Richard Trieuba63ce62011-09-09 01:45:06 +00006251 return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign);
Richard Trieu859d23f2011-09-06 21:01:04 +00006252 return InvalidOperands(Loc, LHS, RHS);
Daniel Dunbar0d2bfec2009-01-05 22:55:36 +00006253 }
Steve Naroffb8ea4fb2007-07-13 23:32:42 +00006254
Richard Trieuba63ce62011-09-09 01:45:06 +00006255 QualType compType = UsualArithmeticConversions(LHS, RHS, IsCompAssign);
Richard Trieu859d23f2011-09-06 21:01:04 +00006256 if (LHS.isInvalid() || RHS.isInvalid())
John Wiegley01296292011-04-08 18:41:53 +00006257 return QualType();
Mike Stump4e1f26a2009-02-19 03:04:26 +00006258
Eli Friedman93ee5ca2012-06-16 02:19:17 +00006259 if (compType.isNull() || !compType->isIntegerType())
Richard Trieu859d23f2011-09-06 21:01:04 +00006260 return InvalidOperands(Loc, LHS, RHS);
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00006261
Chris Lattnerfaa54172010-01-12 21:23:57 +00006262 // Check for remainder by zero.
Richard Trieu859d23f2011-09-06 21:01:04 +00006263 if (RHS.get()->isNullPointerConstant(Context,
Richard Trieucfc491d2011-08-02 04:35:43 +00006264 Expr::NPC_ValueDependentIsNotNull))
Richard Trieu859d23f2011-09-06 21:01:04 +00006265 DiagRuntimeBehavior(Loc, RHS.get(), PDiag(diag::warn_remainder_by_zero)
6266 << RHS.get()->getSourceRange());
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00006267
Chris Lattnerfaa54172010-01-12 21:23:57 +00006268 return compType;
Steve Naroff218bc2b2007-05-04 21:54:46 +00006269}
6270
Chandler Carruthc9332212011-06-27 08:02:19 +00006271/// \brief Diagnose invalid arithmetic on two void pointers.
6272static void diagnoseArithmeticOnTwoVoidPointers(Sema &S, SourceLocation Loc,
Richard Trieu4ae7e972011-09-06 21:13:51 +00006273 Expr *LHSExpr, Expr *RHSExpr) {
David Blaikiebbafb8a2012-03-11 07:00:24 +00006274 S.Diag(Loc, S.getLangOpts().CPlusPlus
Chandler Carruthc9332212011-06-27 08:02:19 +00006275 ? diag::err_typecheck_pointer_arith_void_type
6276 : diag::ext_gnu_void_ptr)
Richard Trieu4ae7e972011-09-06 21:13:51 +00006277 << 1 /* two pointers */ << LHSExpr->getSourceRange()
6278 << RHSExpr->getSourceRange();
Chandler Carruthc9332212011-06-27 08:02:19 +00006279}
6280
6281/// \brief Diagnose invalid arithmetic on a void pointer.
6282static void diagnoseArithmeticOnVoidPointer(Sema &S, SourceLocation Loc,
6283 Expr *Pointer) {
David Blaikiebbafb8a2012-03-11 07:00:24 +00006284 S.Diag(Loc, S.getLangOpts().CPlusPlus
Chandler Carruthc9332212011-06-27 08:02:19 +00006285 ? diag::err_typecheck_pointer_arith_void_type
6286 : diag::ext_gnu_void_ptr)
6287 << 0 /* one pointer */ << Pointer->getSourceRange();
6288}
6289
6290/// \brief Diagnose invalid arithmetic on two function pointers.
6291static void diagnoseArithmeticOnTwoFunctionPointers(Sema &S, SourceLocation Loc,
6292 Expr *LHS, Expr *RHS) {
6293 assert(LHS->getType()->isAnyPointerType());
6294 assert(RHS->getType()->isAnyPointerType());
David Blaikiebbafb8a2012-03-11 07:00:24 +00006295 S.Diag(Loc, S.getLangOpts().CPlusPlus
Chandler Carruthc9332212011-06-27 08:02:19 +00006296 ? diag::err_typecheck_pointer_arith_function_type
6297 : diag::ext_gnu_ptr_func_arith)
6298 << 1 /* two pointers */ << LHS->getType()->getPointeeType()
6299 // We only show the second type if it differs from the first.
6300 << (unsigned)!S.Context.hasSameUnqualifiedType(LHS->getType(),
6301 RHS->getType())
6302 << RHS->getType()->getPointeeType()
6303 << LHS->getSourceRange() << RHS->getSourceRange();
6304}
6305
6306/// \brief Diagnose invalid arithmetic on a function pointer.
6307static void diagnoseArithmeticOnFunctionPointer(Sema &S, SourceLocation Loc,
6308 Expr *Pointer) {
6309 assert(Pointer->getType()->isAnyPointerType());
David Blaikiebbafb8a2012-03-11 07:00:24 +00006310 S.Diag(Loc, S.getLangOpts().CPlusPlus
Chandler Carruthc9332212011-06-27 08:02:19 +00006311 ? diag::err_typecheck_pointer_arith_function_type
6312 : diag::ext_gnu_ptr_func_arith)
6313 << 0 /* one pointer */ << Pointer->getType()->getPointeeType()
6314 << 0 /* one pointer, so only one type */
6315 << Pointer->getSourceRange();
6316}
6317
Richard Trieu993f3ab2011-09-12 18:08:02 +00006318/// \brief Emit error if Operand is incomplete pointer type
Richard Trieuaba22802011-09-02 02:15:37 +00006319///
6320/// \returns True if pointer has incomplete type
6321static bool checkArithmeticIncompletePointerType(Sema &S, SourceLocation Loc,
6322 Expr *Operand) {
John McCallf2538342012-07-31 05:14:30 +00006323 assert(Operand->getType()->isAnyPointerType() &&
6324 !Operand->getType()->isDependentType());
6325 QualType PointeeTy = Operand->getType()->getPointeeType();
6326 return S.RequireCompleteType(Loc, PointeeTy,
6327 diag::err_typecheck_arithmetic_incomplete_type,
6328 PointeeTy, Operand->getSourceRange());
Richard Trieuaba22802011-09-02 02:15:37 +00006329}
6330
Chandler Carruthc9332212011-06-27 08:02:19 +00006331/// \brief Check the validity of an arithmetic pointer operand.
6332///
6333/// If the operand has pointer type, this code will check for pointer types
6334/// which are invalid in arithmetic operations. These will be diagnosed
6335/// appropriately, including whether or not the use is supported as an
6336/// extension.
6337///
6338/// \returns True when the operand is valid to use (even if as an extension).
6339static bool checkArithmeticOpPointerOperand(Sema &S, SourceLocation Loc,
6340 Expr *Operand) {
6341 if (!Operand->getType()->isAnyPointerType()) return true;
6342
6343 QualType PointeeTy = Operand->getType()->getPointeeType();
6344 if (PointeeTy->isVoidType()) {
6345 diagnoseArithmeticOnVoidPointer(S, Loc, Operand);
David Blaikiebbafb8a2012-03-11 07:00:24 +00006346 return !S.getLangOpts().CPlusPlus;
Chandler Carruthc9332212011-06-27 08:02:19 +00006347 }
6348 if (PointeeTy->isFunctionType()) {
6349 diagnoseArithmeticOnFunctionPointer(S, Loc, Operand);
David Blaikiebbafb8a2012-03-11 07:00:24 +00006350 return !S.getLangOpts().CPlusPlus;
Chandler Carruthc9332212011-06-27 08:02:19 +00006351 }
6352
Richard Trieuaba22802011-09-02 02:15:37 +00006353 if (checkArithmeticIncompletePointerType(S, Loc, Operand)) return false;
Chandler Carruthc9332212011-06-27 08:02:19 +00006354
6355 return true;
6356}
6357
6358/// \brief Check the validity of a binary arithmetic operation w.r.t. pointer
6359/// operands.
6360///
6361/// This routine will diagnose any invalid arithmetic on pointer operands much
6362/// like \see checkArithmeticOpPointerOperand. However, it has special logic
6363/// for emitting a single diagnostic even for operations where both LHS and RHS
6364/// are (potentially problematic) pointers.
6365///
6366/// \returns True when the operand is valid to use (even if as an extension).
6367static bool checkArithmeticBinOpPointerOperands(Sema &S, SourceLocation Loc,
Richard Trieu4ae7e972011-09-06 21:13:51 +00006368 Expr *LHSExpr, Expr *RHSExpr) {
6369 bool isLHSPointer = LHSExpr->getType()->isAnyPointerType();
6370 bool isRHSPointer = RHSExpr->getType()->isAnyPointerType();
Chandler Carruthc9332212011-06-27 08:02:19 +00006371 if (!isLHSPointer && !isRHSPointer) return true;
6372
6373 QualType LHSPointeeTy, RHSPointeeTy;
Richard Trieu4ae7e972011-09-06 21:13:51 +00006374 if (isLHSPointer) LHSPointeeTy = LHSExpr->getType()->getPointeeType();
6375 if (isRHSPointer) RHSPointeeTy = RHSExpr->getType()->getPointeeType();
Chandler Carruthc9332212011-06-27 08:02:19 +00006376
6377 // Check for arithmetic on pointers to incomplete types.
6378 bool isLHSVoidPtr = isLHSPointer && LHSPointeeTy->isVoidType();
6379 bool isRHSVoidPtr = isRHSPointer && RHSPointeeTy->isVoidType();
6380 if (isLHSVoidPtr || isRHSVoidPtr) {
Richard Trieu4ae7e972011-09-06 21:13:51 +00006381 if (!isRHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, LHSExpr);
6382 else if (!isLHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, RHSExpr);
6383 else diagnoseArithmeticOnTwoVoidPointers(S, Loc, LHSExpr, RHSExpr);
Chandler Carruthc9332212011-06-27 08:02:19 +00006384
David Blaikiebbafb8a2012-03-11 07:00:24 +00006385 return !S.getLangOpts().CPlusPlus;
Chandler Carruthc9332212011-06-27 08:02:19 +00006386 }
6387
6388 bool isLHSFuncPtr = isLHSPointer && LHSPointeeTy->isFunctionType();
6389 bool isRHSFuncPtr = isRHSPointer && RHSPointeeTy->isFunctionType();
6390 if (isLHSFuncPtr || isRHSFuncPtr) {
Richard Trieu4ae7e972011-09-06 21:13:51 +00006391 if (!isRHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc, LHSExpr);
6392 else if (!isLHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc,
6393 RHSExpr);
6394 else diagnoseArithmeticOnTwoFunctionPointers(S, Loc, LHSExpr, RHSExpr);
Chandler Carruthc9332212011-06-27 08:02:19 +00006395
David Blaikiebbafb8a2012-03-11 07:00:24 +00006396 return !S.getLangOpts().CPlusPlus;
Chandler Carruthc9332212011-06-27 08:02:19 +00006397 }
6398
John McCallf2538342012-07-31 05:14:30 +00006399 if (isLHSPointer && checkArithmeticIncompletePointerType(S, Loc, LHSExpr))
6400 return false;
6401 if (isRHSPointer && checkArithmeticIncompletePointerType(S, Loc, RHSExpr))
6402 return false;
Richard Trieuaba22802011-09-02 02:15:37 +00006403
Chandler Carruthc9332212011-06-27 08:02:19 +00006404 return true;
6405}
6406
Nico Weberccec40d2012-03-02 22:01:22 +00006407/// diagnoseStringPlusInt - Emit a warning when adding an integer to a string
6408/// literal.
6409static void diagnoseStringPlusInt(Sema &Self, SourceLocation OpLoc,
6410 Expr *LHSExpr, Expr *RHSExpr) {
6411 StringLiteral* StrExpr = dyn_cast<StringLiteral>(LHSExpr->IgnoreImpCasts());
6412 Expr* IndexExpr = RHSExpr;
6413 if (!StrExpr) {
6414 StrExpr = dyn_cast<StringLiteral>(RHSExpr->IgnoreImpCasts());
6415 IndexExpr = LHSExpr;
6416 }
6417
6418 bool IsStringPlusInt = StrExpr &&
6419 IndexExpr->getType()->isIntegralOrUnscopedEnumerationType();
6420 if (!IsStringPlusInt)
6421 return;
6422
6423 llvm::APSInt index;
6424 if (IndexExpr->EvaluateAsInt(index, Self.getASTContext())) {
6425 unsigned StrLenWithNull = StrExpr->getLength() + 1;
6426 if (index.isNonNegative() &&
6427 index <= llvm::APSInt(llvm::APInt(index.getBitWidth(), StrLenWithNull),
6428 index.isUnsigned()))
6429 return;
6430 }
6431
6432 SourceRange DiagRange(LHSExpr->getLocStart(), RHSExpr->getLocEnd());
6433 Self.Diag(OpLoc, diag::warn_string_plus_int)
6434 << DiagRange << IndexExpr->IgnoreImpCasts()->getType();
6435
6436 // Only print a fixit for "str" + int, not for int + "str".
6437 if (IndexExpr == RHSExpr) {
6438 SourceLocation EndLoc = Self.PP.getLocForEndOfToken(RHSExpr->getLocEnd());
6439 Self.Diag(OpLoc, diag::note_string_plus_int_silence)
6440 << FixItHint::CreateInsertion(LHSExpr->getLocStart(), "&")
6441 << FixItHint::CreateReplacement(SourceRange(OpLoc), "[")
6442 << FixItHint::CreateInsertion(EndLoc, "]");
6443 } else
6444 Self.Diag(OpLoc, diag::note_string_plus_int_silence);
6445}
6446
Richard Trieu993f3ab2011-09-12 18:08:02 +00006447/// \brief Emit error when two pointers are incompatible.
Richard Trieub10c6312011-09-01 22:53:23 +00006448static void diagnosePointerIncompatibility(Sema &S, SourceLocation Loc,
Richard Trieu4ae7e972011-09-06 21:13:51 +00006449 Expr *LHSExpr, Expr *RHSExpr) {
6450 assert(LHSExpr->getType()->isAnyPointerType());
6451 assert(RHSExpr->getType()->isAnyPointerType());
Richard Trieub10c6312011-09-01 22:53:23 +00006452 S.Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
Richard Trieu4ae7e972011-09-06 21:13:51 +00006453 << LHSExpr->getType() << RHSExpr->getType() << LHSExpr->getSourceRange()
6454 << RHSExpr->getSourceRange();
Richard Trieub10c6312011-09-01 22:53:23 +00006455}
6456
Chris Lattnerfaa54172010-01-12 21:23:57 +00006457QualType Sema::CheckAdditionOperands( // C99 6.5.6
Nico Weberccec40d2012-03-02 22:01:22 +00006458 ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, unsigned Opc,
6459 QualType* CompLHSTy) {
Richard Trieuf8916e12011-09-16 00:53:10 +00006460 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
6461
Richard Trieu4ae7e972011-09-06 21:13:51 +00006462 if (LHS.get()->getType()->isVectorType() ||
6463 RHS.get()->getType()->isVectorType()) {
6464 QualType compType = CheckVectorOperands(LHS, RHS, Loc, CompLHSTy);
Eli Friedman8b7b1b12009-03-28 01:22:36 +00006465 if (CompLHSTy) *CompLHSTy = compType;
6466 return compType;
6467 }
Steve Naroff7a5af782007-07-13 16:58:59 +00006468
Richard Trieu4ae7e972011-09-06 21:13:51 +00006469 QualType compType = UsualArithmeticConversions(LHS, RHS, CompLHSTy);
6470 if (LHS.isInvalid() || RHS.isInvalid())
John Wiegley01296292011-04-08 18:41:53 +00006471 return QualType();
Eli Friedman8e122982008-05-18 18:08:51 +00006472
Nico Weberccec40d2012-03-02 22:01:22 +00006473 // Diagnose "string literal" '+' int.
6474 if (Opc == BO_Add)
6475 diagnoseStringPlusInt(*this, Loc, LHS.get(), RHS.get());
6476
Steve Naroffe4718892007-04-27 18:30:00 +00006477 // handle the common case first (both operands are arithmetic).
Eli Friedman93ee5ca2012-06-16 02:19:17 +00006478 if (!compType.isNull() && compType->isArithmeticType()) {
Eli Friedman8b7b1b12009-03-28 01:22:36 +00006479 if (CompLHSTy) *CompLHSTy = compType;
Steve Naroffbe4c4d12007-08-24 19:07:16 +00006480 return compType;
Eli Friedman8b7b1b12009-03-28 01:22:36 +00006481 }
Steve Naroff218bc2b2007-05-04 21:54:46 +00006482
John McCallf2538342012-07-31 05:14:30 +00006483 // Type-checking. Ultimately the pointer's going to be in PExp;
6484 // note that we bias towards the LHS being the pointer.
6485 Expr *PExp = LHS.get(), *IExp = RHS.get();
Eli Friedman8e122982008-05-18 18:08:51 +00006486
John McCallf2538342012-07-31 05:14:30 +00006487 bool isObjCPointer;
6488 if (PExp->getType()->isPointerType()) {
6489 isObjCPointer = false;
6490 } else if (PExp->getType()->isObjCObjectPointerType()) {
6491 isObjCPointer = true;
6492 } else {
6493 std::swap(PExp, IExp);
6494 if (PExp->getType()->isPointerType()) {
6495 isObjCPointer = false;
6496 } else if (PExp->getType()->isObjCObjectPointerType()) {
6497 isObjCPointer = true;
6498 } else {
6499 return InvalidOperands(Loc, LHS, RHS);
6500 }
6501 }
6502 assert(PExp->getType()->isAnyPointerType());
Chandler Carruthc9332212011-06-27 08:02:19 +00006503
Richard Trieub420bca2011-09-12 18:37:54 +00006504 if (!IExp->getType()->isIntegerType())
6505 return InvalidOperands(Loc, LHS, RHS);
Mike Stump11289f42009-09-09 15:08:12 +00006506
Richard Trieub420bca2011-09-12 18:37:54 +00006507 if (!checkArithmeticOpPointerOperand(*this, Loc, PExp))
6508 return QualType();
Kaelyn Uhrain2e7aa5a2011-08-05 23:18:04 +00006509
John McCallf2538342012-07-31 05:14:30 +00006510 if (isObjCPointer && checkArithmeticOnObjCPointer(*this, Loc, PExp))
Richard Trieub420bca2011-09-12 18:37:54 +00006511 return QualType();
6512
6513 // Check array bounds for pointer arithemtic
6514 CheckArrayAccess(PExp, IExp);
6515
6516 if (CompLHSTy) {
6517 QualType LHSTy = Context.isPromotableBitField(LHS.get());
6518 if (LHSTy.isNull()) {
6519 LHSTy = LHS.get()->getType();
6520 if (LHSTy->isPromotableIntegerType())
6521 LHSTy = Context.getPromotedIntegerType(LHSTy);
Eli Friedman8e122982008-05-18 18:08:51 +00006522 }
Richard Trieub420bca2011-09-12 18:37:54 +00006523 *CompLHSTy = LHSTy;
Eli Friedman8e122982008-05-18 18:08:51 +00006524 }
6525
Richard Trieub420bca2011-09-12 18:37:54 +00006526 return PExp->getType();
Steve Naroff26c8ea52007-03-21 21:08:52 +00006527}
6528
Chris Lattner2a3569b2008-04-07 05:30:13 +00006529// C99 6.5.6
Richard Trieu4ae7e972011-09-06 21:13:51 +00006530QualType Sema::CheckSubtractionOperands(ExprResult &LHS, ExprResult &RHS,
Richard Trieucfc491d2011-08-02 04:35:43 +00006531 SourceLocation Loc,
6532 QualType* CompLHSTy) {
Richard Trieuf8916e12011-09-16 00:53:10 +00006533 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
6534
Richard Trieu4ae7e972011-09-06 21:13:51 +00006535 if (LHS.get()->getType()->isVectorType() ||
6536 RHS.get()->getType()->isVectorType()) {
6537 QualType compType = CheckVectorOperands(LHS, RHS, Loc, CompLHSTy);
Eli Friedman8b7b1b12009-03-28 01:22:36 +00006538 if (CompLHSTy) *CompLHSTy = compType;
6539 return compType;
6540 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00006541
Richard Trieu4ae7e972011-09-06 21:13:51 +00006542 QualType compType = UsualArithmeticConversions(LHS, RHS, CompLHSTy);
6543 if (LHS.isInvalid() || RHS.isInvalid())
John Wiegley01296292011-04-08 18:41:53 +00006544 return QualType();
Mike Stump4e1f26a2009-02-19 03:04:26 +00006545
Chris Lattner4d62f422007-12-09 21:53:25 +00006546 // Enforce type constraints: C99 6.5.6p3.
Mike Stump4e1f26a2009-02-19 03:04:26 +00006547
Chris Lattner4d62f422007-12-09 21:53:25 +00006548 // Handle the common case first (both operands are arithmetic).
Eli Friedman93ee5ca2012-06-16 02:19:17 +00006549 if (!compType.isNull() && compType->isArithmeticType()) {
Eli Friedman8b7b1b12009-03-28 01:22:36 +00006550 if (CompLHSTy) *CompLHSTy = compType;
Steve Naroffbe4c4d12007-08-24 19:07:16 +00006551 return compType;
Eli Friedman8b7b1b12009-03-28 01:22:36 +00006552 }
Mike Stump11289f42009-09-09 15:08:12 +00006553
Chris Lattner4d62f422007-12-09 21:53:25 +00006554 // Either ptr - int or ptr - ptr.
Richard Trieu4ae7e972011-09-06 21:13:51 +00006555 if (LHS.get()->getType()->isAnyPointerType()) {
6556 QualType lpointee = LHS.get()->getType()->getPointeeType();
Mike Stump4e1f26a2009-02-19 03:04:26 +00006557
Chris Lattner12bdebb2009-04-24 23:50:08 +00006558 // Diagnose bad cases where we step over interface counts.
John McCallf2538342012-07-31 05:14:30 +00006559 if (LHS.get()->getType()->isObjCObjectPointerType() &&
6560 checkArithmeticOnObjCPointer(*this, Loc, LHS.get()))
Chris Lattner12bdebb2009-04-24 23:50:08 +00006561 return QualType();
Mike Stump11289f42009-09-09 15:08:12 +00006562
Chris Lattner4d62f422007-12-09 21:53:25 +00006563 // The result type of a pointer-int computation is the pointer type.
Richard Trieu4ae7e972011-09-06 21:13:51 +00006564 if (RHS.get()->getType()->isIntegerType()) {
6565 if (!checkArithmeticOpPointerOperand(*this, Loc, LHS.get()))
Chandler Carruthc9332212011-06-27 08:02:19 +00006566 return QualType();
Douglas Gregorac1fb652009-03-24 19:52:54 +00006567
Kaelyn Uhrain2e7aa5a2011-08-05 23:18:04 +00006568 // Check array bounds for pointer arithemtic
Richard Smith13f67182011-12-16 19:31:14 +00006569 CheckArrayAccess(LHS.get(), RHS.get(), /*ArraySubscriptExpr*/0,
6570 /*AllowOnePastEnd*/true, /*IndexNegated*/true);
Kaelyn Uhrain2e7aa5a2011-08-05 23:18:04 +00006571
Richard Trieu4ae7e972011-09-06 21:13:51 +00006572 if (CompLHSTy) *CompLHSTy = LHS.get()->getType();
6573 return LHS.get()->getType();
Douglas Gregorac1fb652009-03-24 19:52:54 +00006574 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00006575
Chris Lattner4d62f422007-12-09 21:53:25 +00006576 // Handle pointer-pointer subtractions.
Richard Trieucfc491d2011-08-02 04:35:43 +00006577 if (const PointerType *RHSPTy
Richard Trieu4ae7e972011-09-06 21:13:51 +00006578 = RHS.get()->getType()->getAs<PointerType>()) {
Eli Friedman1974e532008-02-08 01:19:44 +00006579 QualType rpointee = RHSPTy->getPointeeType();
Mike Stump4e1f26a2009-02-19 03:04:26 +00006580
David Blaikiebbafb8a2012-03-11 07:00:24 +00006581 if (getLangOpts().CPlusPlus) {
Eli Friedman168fe152009-05-16 13:54:38 +00006582 // Pointee types must be the same: C++ [expr.add]
6583 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) {
Richard Trieu4ae7e972011-09-06 21:13:51 +00006584 diagnosePointerIncompatibility(*this, Loc, LHS.get(), RHS.get());
Eli Friedman168fe152009-05-16 13:54:38 +00006585 }
6586 } else {
6587 // Pointee types must be compatible C99 6.5.6p3
6588 if (!Context.typesAreCompatible(
6589 Context.getCanonicalType(lpointee).getUnqualifiedType(),
6590 Context.getCanonicalType(rpointee).getUnqualifiedType())) {
Richard Trieu4ae7e972011-09-06 21:13:51 +00006591 diagnosePointerIncompatibility(*this, Loc, LHS.get(), RHS.get());
Eli Friedman168fe152009-05-16 13:54:38 +00006592 return QualType();
6593 }
Chris Lattner4d62f422007-12-09 21:53:25 +00006594 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00006595
Chandler Carruthc9332212011-06-27 08:02:19 +00006596 if (!checkArithmeticBinOpPointerOperands(*this, Loc,
Richard Trieu4ae7e972011-09-06 21:13:51 +00006597 LHS.get(), RHS.get()))
Chandler Carruthc9332212011-06-27 08:02:19 +00006598 return QualType();
Eli Friedman8b7b1b12009-03-28 01:22:36 +00006599
Richard Trieu4ae7e972011-09-06 21:13:51 +00006600 if (CompLHSTy) *CompLHSTy = LHS.get()->getType();
Chris Lattner4d62f422007-12-09 21:53:25 +00006601 return Context.getPointerDiffType();
6602 }
6603 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00006604
Richard Trieu4ae7e972011-09-06 21:13:51 +00006605 return InvalidOperands(Loc, LHS, RHS);
Steve Naroff218bc2b2007-05-04 21:54:46 +00006606}
6607
Douglas Gregor0bf31402010-10-08 23:50:27 +00006608static bool isScopedEnumerationType(QualType T) {
6609 if (const EnumType *ET = dyn_cast<EnumType>(T))
6610 return ET->getDecl()->isScoped();
6611 return false;
6612}
6613
Richard Trieue4a19fb2011-09-06 21:21:28 +00006614static void DiagnoseBadShiftValues(Sema& S, ExprResult &LHS, ExprResult &RHS,
Chandler Carruth4c6fdca2011-02-23 23:34:11 +00006615 SourceLocation Loc, unsigned Opc,
Richard Trieue4a19fb2011-09-06 21:21:28 +00006616 QualType LHSType) {
David Tweed042e0882013-01-07 16:43:27 +00006617 // OpenCL 6.3j: shift values are effectively % word size of LHS (more defined),
6618 // so skip remaining warnings as we don't want to modify values within Sema.
6619 if (S.getLangOpts().OpenCL)
6620 return;
6621
Chandler Carruth4c6fdca2011-02-23 23:34:11 +00006622 llvm::APSInt Right;
6623 // Check right/shifter operand
Richard Trieue4a19fb2011-09-06 21:21:28 +00006624 if (RHS.get()->isValueDependent() ||
6625 !RHS.get()->isIntegerConstantExpr(Right, S.Context))
Chandler Carruth4c6fdca2011-02-23 23:34:11 +00006626 return;
6627
6628 if (Right.isNegative()) {
Richard Trieue4a19fb2011-09-06 21:21:28 +00006629 S.DiagRuntimeBehavior(Loc, RHS.get(),
Ted Kremenek63657fe2011-03-01 18:09:31 +00006630 S.PDiag(diag::warn_shift_negative)
Richard Trieue4a19fb2011-09-06 21:21:28 +00006631 << RHS.get()->getSourceRange());
Chandler Carruth4c6fdca2011-02-23 23:34:11 +00006632 return;
6633 }
6634 llvm::APInt LeftBits(Right.getBitWidth(),
Richard Trieue4a19fb2011-09-06 21:21:28 +00006635 S.Context.getTypeSize(LHS.get()->getType()));
Chandler Carruth4c6fdca2011-02-23 23:34:11 +00006636 if (Right.uge(LeftBits)) {
Richard Trieue4a19fb2011-09-06 21:21:28 +00006637 S.DiagRuntimeBehavior(Loc, RHS.get(),
Ted Kremenek26bbc3d2011-03-01 19:13:22 +00006638 S.PDiag(diag::warn_shift_gt_typewidth)
Richard Trieue4a19fb2011-09-06 21:21:28 +00006639 << RHS.get()->getSourceRange());
Chandler Carruth4c6fdca2011-02-23 23:34:11 +00006640 return;
6641 }
6642 if (Opc != BO_Shl)
6643 return;
6644
6645 // When left shifting an ICE which is signed, we can check for overflow which
6646 // according to C++ has undefined behavior ([expr.shift] 5.8/2). Unsigned
6647 // integers have defined behavior modulo one more than the maximum value
6648 // representable in the result type, so never warn for those.
6649 llvm::APSInt Left;
Richard Trieue4a19fb2011-09-06 21:21:28 +00006650 if (LHS.get()->isValueDependent() ||
6651 !LHS.get()->isIntegerConstantExpr(Left, S.Context) ||
6652 LHSType->hasUnsignedIntegerRepresentation())
Chandler Carruth4c6fdca2011-02-23 23:34:11 +00006653 return;
6654 llvm::APInt ResultBits =
6655 static_cast<llvm::APInt&>(Right) + Left.getMinSignedBits();
6656 if (LeftBits.uge(ResultBits))
6657 return;
6658 llvm::APSInt Result = Left.extend(ResultBits.getLimitedValue());
6659 Result = Result.shl(Right);
6660
Ted Kremenek70f05fd2011-06-15 00:54:52 +00006661 // Print the bit representation of the signed integer as an unsigned
6662 // hexadecimal number.
Dylan Noblesmith2c1dd272012-02-05 02:13:05 +00006663 SmallString<40> HexResult;
Ted Kremenek70f05fd2011-06-15 00:54:52 +00006664 Result.toString(HexResult, 16, /*Signed =*/false, /*Literal =*/true);
6665
Chandler Carruth4c6fdca2011-02-23 23:34:11 +00006666 // If we are only missing a sign bit, this is less likely to result in actual
6667 // bugs -- if the result is cast back to an unsigned type, it will have the
6668 // expected value. Thus we place this behind a different warning that can be
6669 // turned off separately if needed.
6670 if (LeftBits == ResultBits - 1) {
Ted Kremenek70f05fd2011-06-15 00:54:52 +00006671 S.Diag(Loc, diag::warn_shift_result_sets_sign_bit)
Richard Trieue4a19fb2011-09-06 21:21:28 +00006672 << HexResult.str() << LHSType
6673 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Chandler Carruth4c6fdca2011-02-23 23:34:11 +00006674 return;
6675 }
6676
6677 S.Diag(Loc, diag::warn_shift_result_gt_typewidth)
Richard Trieue4a19fb2011-09-06 21:21:28 +00006678 << HexResult.str() << Result.getMinSignedBits() << LHSType
6679 << Left.getBitWidth() << LHS.get()->getSourceRange()
6680 << RHS.get()->getSourceRange();
Chandler Carruth4c6fdca2011-02-23 23:34:11 +00006681}
6682
Chris Lattner2a3569b2008-04-07 05:30:13 +00006683// C99 6.5.7
Richard Trieue4a19fb2011-09-06 21:21:28 +00006684QualType Sema::CheckShiftOperands(ExprResult &LHS, ExprResult &RHS,
Richard Trieucfc491d2011-08-02 04:35:43 +00006685 SourceLocation Loc, unsigned Opc,
Richard Trieuba63ce62011-09-09 01:45:06 +00006686 bool IsCompAssign) {
Richard Trieuf8916e12011-09-16 00:53:10 +00006687 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
6688
Chris Lattner5c11c412007-12-12 05:47:28 +00006689 // C99 6.5.7p2: Each of the operands shall have integer type.
Richard Trieue4a19fb2011-09-06 21:21:28 +00006690 if (!LHS.get()->getType()->hasIntegerRepresentation() ||
6691 !RHS.get()->getType()->hasIntegerRepresentation())
6692 return InvalidOperands(Loc, LHS, RHS);
Mike Stump4e1f26a2009-02-19 03:04:26 +00006693
Douglas Gregor0bf31402010-10-08 23:50:27 +00006694 // C++0x: Don't allow scoped enums. FIXME: Use something better than
6695 // hasIntegerRepresentation() above instead of this.
Richard Trieue4a19fb2011-09-06 21:21:28 +00006696 if (isScopedEnumerationType(LHS.get()->getType()) ||
6697 isScopedEnumerationType(RHS.get()->getType())) {
6698 return InvalidOperands(Loc, LHS, RHS);
Douglas Gregor0bf31402010-10-08 23:50:27 +00006699 }
6700
Nate Begemane46ee9a2009-10-25 02:26:48 +00006701 // Vector shifts promote their scalar inputs to vector type.
Richard Trieue4a19fb2011-09-06 21:21:28 +00006702 if (LHS.get()->getType()->isVectorType() ||
6703 RHS.get()->getType()->isVectorType())
Richard Trieuba63ce62011-09-09 01:45:06 +00006704 return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign);
Nate Begemane46ee9a2009-10-25 02:26:48 +00006705
Chris Lattner5c11c412007-12-12 05:47:28 +00006706 // Shifts don't perform usual arithmetic conversions, they just do integer
6707 // promotions on each operand. C99 6.5.7p3
Eli Friedman8b7b1b12009-03-28 01:22:36 +00006708
John McCall57cdd882010-12-16 19:28:59 +00006709 // For the LHS, do usual unary conversions, but then reset them away
6710 // if this is a compound assignment.
Richard Trieue4a19fb2011-09-06 21:21:28 +00006711 ExprResult OldLHS = LHS;
6712 LHS = UsualUnaryConversions(LHS.take());
6713 if (LHS.isInvalid())
John Wiegley01296292011-04-08 18:41:53 +00006714 return QualType();
Richard Trieue4a19fb2011-09-06 21:21:28 +00006715 QualType LHSType = LHS.get()->getType();
Richard Trieuba63ce62011-09-09 01:45:06 +00006716 if (IsCompAssign) LHS = OldLHS;
John McCall57cdd882010-12-16 19:28:59 +00006717
6718 // The RHS is simpler.
Richard Trieue4a19fb2011-09-06 21:21:28 +00006719 RHS = UsualUnaryConversions(RHS.take());
6720 if (RHS.isInvalid())
John Wiegley01296292011-04-08 18:41:53 +00006721 return QualType();
Mike Stump4e1f26a2009-02-19 03:04:26 +00006722
Ryan Flynnf53fab82009-08-07 16:20:20 +00006723 // Sanity-check shift operands
Richard Trieue4a19fb2011-09-06 21:21:28 +00006724 DiagnoseBadShiftValues(*this, LHS, RHS, Loc, Opc, LHSType);
Ryan Flynnf53fab82009-08-07 16:20:20 +00006725
Chris Lattner5c11c412007-12-12 05:47:28 +00006726 // "The type of the result is that of the promoted left operand."
Richard Trieue4a19fb2011-09-06 21:21:28 +00006727 return LHSType;
Steve Naroff26c8ea52007-03-21 21:08:52 +00006728}
6729
Chandler Carruth17773fc2010-07-10 12:30:03 +00006730static bool IsWithinTemplateSpecialization(Decl *D) {
6731 if (DeclContext *DC = D->getDeclContext()) {
6732 if (isa<ClassTemplateSpecializationDecl>(DC))
6733 return true;
6734 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(DC))
6735 return FD->isFunctionTemplateSpecialization();
6736 }
6737 return false;
6738}
6739
Richard Trieueea56f72011-09-02 03:48:46 +00006740/// If two different enums are compared, raise a warning.
Ted Kremenekf2ca8ec2013-01-30 19:10:21 +00006741static void checkEnumComparison(Sema &S, SourceLocation Loc, Expr *LHS,
6742 Expr *RHS) {
6743 QualType LHSStrippedType = LHS->IgnoreParenImpCasts()->getType();
6744 QualType RHSStrippedType = RHS->IgnoreParenImpCasts()->getType();
Richard Trieueea56f72011-09-02 03:48:46 +00006745
6746 const EnumType *LHSEnumType = LHSStrippedType->getAs<EnumType>();
6747 if (!LHSEnumType)
6748 return;
6749 const EnumType *RHSEnumType = RHSStrippedType->getAs<EnumType>();
6750 if (!RHSEnumType)
6751 return;
6752
6753 // Ignore anonymous enums.
6754 if (!LHSEnumType->getDecl()->getIdentifier())
6755 return;
6756 if (!RHSEnumType->getDecl()->getIdentifier())
6757 return;
6758
6759 if (S.Context.hasSameUnqualifiedType(LHSStrippedType, RHSStrippedType))
6760 return;
6761
6762 S.Diag(Loc, diag::warn_comparison_of_mixed_enum_types)
6763 << LHSStrippedType << RHSStrippedType
Ted Kremenekf2ca8ec2013-01-30 19:10:21 +00006764 << LHS->getSourceRange() << RHS->getSourceRange();
Richard Trieueea56f72011-09-02 03:48:46 +00006765}
6766
Richard Trieudd82a5c2011-09-02 02:55:45 +00006767/// \brief Diagnose bad pointer comparisons.
6768static void diagnoseDistinctPointerComparison(Sema &S, SourceLocation Loc,
Richard Trieu1762d7c2011-09-06 21:27:33 +00006769 ExprResult &LHS, ExprResult &RHS,
Richard Trieuba63ce62011-09-09 01:45:06 +00006770 bool IsError) {
6771 S.Diag(Loc, IsError ? diag::err_typecheck_comparison_of_distinct_pointers
Richard Trieudd82a5c2011-09-02 02:55:45 +00006772 : diag::ext_typecheck_comparison_of_distinct_pointers)
Richard Trieu1762d7c2011-09-06 21:27:33 +00006773 << LHS.get()->getType() << RHS.get()->getType()
6774 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Richard Trieudd82a5c2011-09-02 02:55:45 +00006775}
6776
6777/// \brief Returns false if the pointers are converted to a composite type,
6778/// true otherwise.
6779static bool convertPointersToCompositeType(Sema &S, SourceLocation Loc,
Richard Trieu1762d7c2011-09-06 21:27:33 +00006780 ExprResult &LHS, ExprResult &RHS) {
Richard Trieudd82a5c2011-09-02 02:55:45 +00006781 // C++ [expr.rel]p2:
6782 // [...] Pointer conversions (4.10) and qualification
6783 // conversions (4.4) are performed on pointer operands (or on
6784 // a pointer operand and a null pointer constant) to bring
6785 // them to their composite pointer type. [...]
6786 //
6787 // C++ [expr.eq]p1 uses the same notion for (in)equality
6788 // comparisons of pointers.
6789
6790 // C++ [expr.eq]p2:
6791 // In addition, pointers to members can be compared, or a pointer to
6792 // member and a null pointer constant. Pointer to member conversions
6793 // (4.11) and qualification conversions (4.4) are performed to bring
6794 // them to a common type. If one operand is a null pointer constant,
6795 // the common type is the type of the other operand. Otherwise, the
6796 // common type is a pointer to member type similar (4.4) to the type
6797 // of one of the operands, with a cv-qualification signature (4.4)
6798 // that is the union of the cv-qualification signatures of the operand
6799 // types.
6800
Richard Trieu1762d7c2011-09-06 21:27:33 +00006801 QualType LHSType = LHS.get()->getType();
6802 QualType RHSType = RHS.get()->getType();
6803 assert((LHSType->isPointerType() && RHSType->isPointerType()) ||
6804 (LHSType->isMemberPointerType() && RHSType->isMemberPointerType()));
Richard Trieudd82a5c2011-09-02 02:55:45 +00006805
6806 bool NonStandardCompositeType = false;
Richard Trieu48277e52011-09-02 21:44:27 +00006807 bool *BoolPtr = S.isSFINAEContext() ? 0 : &NonStandardCompositeType;
Richard Trieu1762d7c2011-09-06 21:27:33 +00006808 QualType T = S.FindCompositePointerType(Loc, LHS, RHS, BoolPtr);
Richard Trieudd82a5c2011-09-02 02:55:45 +00006809 if (T.isNull()) {
Richard Trieu1762d7c2011-09-06 21:27:33 +00006810 diagnoseDistinctPointerComparison(S, Loc, LHS, RHS, /*isError*/true);
Richard Trieudd82a5c2011-09-02 02:55:45 +00006811 return true;
6812 }
6813
6814 if (NonStandardCompositeType)
6815 S.Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers_nonstandard)
Richard Trieu1762d7c2011-09-06 21:27:33 +00006816 << LHSType << RHSType << T << LHS.get()->getSourceRange()
6817 << RHS.get()->getSourceRange();
Richard Trieudd82a5c2011-09-02 02:55:45 +00006818
Richard Trieu1762d7c2011-09-06 21:27:33 +00006819 LHS = S.ImpCastExprToType(LHS.take(), T, CK_BitCast);
6820 RHS = S.ImpCastExprToType(RHS.take(), T, CK_BitCast);
Richard Trieudd82a5c2011-09-02 02:55:45 +00006821 return false;
6822}
6823
6824static void diagnoseFunctionPointerToVoidComparison(Sema &S, SourceLocation Loc,
Richard Trieu1762d7c2011-09-06 21:27:33 +00006825 ExprResult &LHS,
6826 ExprResult &RHS,
Richard Trieuba63ce62011-09-09 01:45:06 +00006827 bool IsError) {
6828 S.Diag(Loc, IsError ? diag::err_typecheck_comparison_of_fptr_to_void
6829 : diag::ext_typecheck_comparison_of_fptr_to_void)
Richard Trieu1762d7c2011-09-06 21:27:33 +00006830 << LHS.get()->getType() << RHS.get()->getType()
6831 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Richard Trieudd82a5c2011-09-02 02:55:45 +00006832}
6833
Jordan Rosed49a33e2012-06-08 21:14:25 +00006834static bool isObjCObjectLiteral(ExprResult &E) {
Jordan Rosee2028132012-11-09 23:55:21 +00006835 switch (E.get()->IgnoreParenImpCasts()->getStmtClass()) {
Jordan Rosed49a33e2012-06-08 21:14:25 +00006836 case Stmt::ObjCArrayLiteralClass:
6837 case Stmt::ObjCDictionaryLiteralClass:
6838 case Stmt::ObjCStringLiteralClass:
6839 case Stmt::ObjCBoxedExprClass:
6840 return true;
6841 default:
6842 // Note that ObjCBoolLiteral is NOT an object literal!
6843 return false;
6844 }
6845}
6846
Jordan Rose7660f782012-07-17 17:46:40 +00006847static bool hasIsEqualMethod(Sema &S, const Expr *LHS, const Expr *RHS) {
6848 // Get the LHS object's interface type.
6849 QualType Type = LHS->getType();
6850 QualType InterfaceType;
6851 if (const ObjCObjectPointerType *PTy = Type->getAs<ObjCObjectPointerType>()) {
6852 InterfaceType = PTy->getPointeeType();
6853 if (const ObjCObjectType *iQFaceTy =
6854 InterfaceType->getAsObjCQualifiedInterfaceType())
6855 InterfaceType = iQFaceTy->getBaseType();
6856 } else {
6857 // If this is not actually an Objective-C object, bail out.
6858 return false;
6859 }
6860
6861 // If the RHS isn't an Objective-C object, bail out.
6862 if (!RHS->getType()->isObjCObjectPointerType())
6863 return false;
6864
6865 // Try to find the -isEqual: method.
6866 Selector IsEqualSel = S.NSAPIObj->getIsEqualSelector();
6867 ObjCMethodDecl *Method = S.LookupMethodInObjectType(IsEqualSel,
6868 InterfaceType,
6869 /*instance=*/true);
6870 if (!Method) {
6871 if (Type->isObjCIdType()) {
6872 // For 'id', just check the global pool.
6873 Method = S.LookupInstanceMethodInGlobalPool(IsEqualSel, SourceRange(),
6874 /*receiverId=*/true,
6875 /*warn=*/false);
6876 } else {
6877 // Check protocols.
6878 Method = S.LookupMethodInQualifiedType(IsEqualSel,
6879 cast<ObjCObjectPointerType>(Type),
6880 /*instance=*/true);
6881 }
6882 }
6883
6884 if (!Method)
6885 return false;
6886
6887 QualType T = Method->param_begin()[0]->getType();
6888 if (!T->isObjCObjectPointerType())
6889 return false;
6890
6891 QualType R = Method->getResultType();
6892 if (!R->isScalarType())
6893 return false;
6894
6895 return true;
6896}
6897
Ted Kremenek01a33f82012-12-21 21:59:36 +00006898Sema::ObjCLiteralKind Sema::CheckLiteralKind(Expr *FromE) {
6899 FromE = FromE->IgnoreParenImpCasts();
6900 switch (FromE->getStmtClass()) {
6901 default:
6902 break;
6903 case Stmt::ObjCStringLiteralClass:
6904 // "string literal"
6905 return LK_String;
6906 case Stmt::ObjCArrayLiteralClass:
6907 // "array literal"
6908 return LK_Array;
6909 case Stmt::ObjCDictionaryLiteralClass:
6910 // "dictionary literal"
6911 return LK_Dictionary;
Ted Kremenek64873352012-12-21 22:46:35 +00006912 case Stmt::BlockExprClass:
6913 return LK_Block;
Ted Kremenek01a33f82012-12-21 21:59:36 +00006914 case Stmt::ObjCBoxedExprClass: {
Ted Kremenek44c2a2a2012-12-21 21:59:39 +00006915 Expr *Inner = cast<ObjCBoxedExpr>(FromE)->getSubExpr()->IgnoreParens();
Ted Kremenek01a33f82012-12-21 21:59:36 +00006916 switch (Inner->getStmtClass()) {
6917 case Stmt::IntegerLiteralClass:
6918 case Stmt::FloatingLiteralClass:
6919 case Stmt::CharacterLiteralClass:
6920 case Stmt::ObjCBoolLiteralExprClass:
6921 case Stmt::CXXBoolLiteralExprClass:
6922 // "numeric literal"
6923 return LK_Numeric;
6924 case Stmt::ImplicitCastExprClass: {
6925 CastKind CK = cast<CastExpr>(Inner)->getCastKind();
6926 // Boolean literals can be represented by implicit casts.
6927 if (CK == CK_IntegralToBoolean || CK == CK_IntegralCast)
6928 return LK_Numeric;
6929 break;
6930 }
6931 default:
6932 break;
6933 }
6934 return LK_Boxed;
6935 }
6936 }
6937 return LK_None;
6938}
6939
Jordan Rose7660f782012-07-17 17:46:40 +00006940static void diagnoseObjCLiteralComparison(Sema &S, SourceLocation Loc,
6941 ExprResult &LHS, ExprResult &RHS,
6942 BinaryOperator::Opcode Opc){
Jordan Rose63ffaa82012-07-17 17:46:48 +00006943 Expr *Literal;
6944 Expr *Other;
6945 if (isObjCObjectLiteral(LHS)) {
6946 Literal = LHS.get();
6947 Other = RHS.get();
6948 } else {
6949 Literal = RHS.get();
6950 Other = LHS.get();
6951 }
6952
6953 // Don't warn on comparisons against nil.
6954 Other = Other->IgnoreParenCasts();
6955 if (Other->isNullPointerConstant(S.getASTContext(),
6956 Expr::NPC_ValueDependentIsNotNull))
6957 return;
Jordan Rosed49a33e2012-06-08 21:14:25 +00006958
Jordan Roseea70bf72012-07-17 17:46:44 +00006959 // This should be kept in sync with warn_objc_literal_comparison.
Ted Kremenek01a33f82012-12-21 21:59:36 +00006960 // LK_String should always be after the other literals, since it has its own
6961 // warning flag.
6962 Sema::ObjCLiteralKind LiteralKind = S.CheckLiteralKind(Literal);
Ted Kremenek64873352012-12-21 22:46:35 +00006963 assert(LiteralKind != Sema::LK_Block);
Ted Kremenek01a33f82012-12-21 21:59:36 +00006964 if (LiteralKind == Sema::LK_None) {
Jordan Rosed49a33e2012-06-08 21:14:25 +00006965 llvm_unreachable("Unknown Objective-C object literal kind");
6966 }
6967
Ted Kremenek01a33f82012-12-21 21:59:36 +00006968 if (LiteralKind == Sema::LK_String)
Jordan Roseea70bf72012-07-17 17:46:44 +00006969 S.Diag(Loc, diag::warn_objc_string_literal_comparison)
6970 << Literal->getSourceRange();
6971 else
6972 S.Diag(Loc, diag::warn_objc_literal_comparison)
6973 << LiteralKind << Literal->getSourceRange();
Jordan Rosed49a33e2012-06-08 21:14:25 +00006974
Jordan Rose7660f782012-07-17 17:46:40 +00006975 if (BinaryOperator::isEqualityOp(Opc) &&
6976 hasIsEqualMethod(S, LHS.get(), RHS.get())) {
6977 SourceLocation Start = LHS.get()->getLocStart();
6978 SourceLocation End = S.PP.getLocForEndOfToken(RHS.get()->getLocEnd());
Fariborz Jahanian4dca1d32013-02-01 20:04:49 +00006979 CharSourceRange OpRange =
6980 CharSourceRange::getCharRange(Loc, S.PP.getLocForEndOfToken(Loc));
Jordan Rosef9198032012-07-09 16:54:44 +00006981
Jordan Rose7660f782012-07-17 17:46:40 +00006982 S.Diag(Loc, diag::note_objc_literal_comparison_isequal)
6983 << FixItHint::CreateInsertion(Start, Opc == BO_EQ ? "[" : "![")
Fariborz Jahanian4dca1d32013-02-01 20:04:49 +00006984 << FixItHint::CreateReplacement(OpRange, " isEqual:")
Jordan Rose7660f782012-07-17 17:46:40 +00006985 << FixItHint::CreateInsertion(End, "]");
Jordan Rosed49a33e2012-06-08 21:14:25 +00006986 }
Jordan Rosed49a33e2012-06-08 21:14:25 +00006987}
6988
Douglas Gregor5b07c7e2009-05-04 06:07:12 +00006989// C99 6.5.8, C++ [expr.rel]
Richard Trieub80728f2011-09-06 21:43:51 +00006990QualType Sema::CheckCompareOperands(ExprResult &LHS, ExprResult &RHS,
Richard Trieucfc491d2011-08-02 04:35:43 +00006991 SourceLocation Loc, unsigned OpaqueOpc,
Richard Trieuba63ce62011-09-09 01:45:06 +00006992 bool IsRelational) {
Richard Trieuf8916e12011-09-16 00:53:10 +00006993 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/true);
6994
John McCalle3027922010-08-25 11:45:40 +00006995 BinaryOperatorKind Opc = (BinaryOperatorKind) OpaqueOpc;
Douglas Gregor7a5bc762009-04-06 18:45:53 +00006996
Chris Lattner9a152e22009-12-05 05:40:13 +00006997 // Handle vector comparisons separately.
Richard Trieub80728f2011-09-06 21:43:51 +00006998 if (LHS.get()->getType()->isVectorType() ||
6999 RHS.get()->getType()->isVectorType())
Richard Trieuba63ce62011-09-09 01:45:06 +00007000 return CheckVectorCompareOperands(LHS, RHS, Loc, IsRelational);
Mike Stump4e1f26a2009-02-19 03:04:26 +00007001
Richard Trieub80728f2011-09-06 21:43:51 +00007002 QualType LHSType = LHS.get()->getType();
7003 QualType RHSType = RHS.get()->getType();
Benjamin Kramera66aaa92011-09-03 08:46:20 +00007004
Richard Trieub80728f2011-09-06 21:43:51 +00007005 Expr *LHSStripped = LHS.get()->IgnoreParenImpCasts();
7006 Expr *RHSStripped = RHS.get()->IgnoreParenImpCasts();
Chandler Carruth712563b2011-02-17 08:37:06 +00007007
Ted Kremenekf2ca8ec2013-01-30 19:10:21 +00007008 checkEnumComparison(*this, Loc, LHS.get(), RHS.get());
Chandler Carruth712563b2011-02-17 08:37:06 +00007009
Richard Trieub80728f2011-09-06 21:43:51 +00007010 if (!LHSType->hasFloatingRepresentation() &&
Richard Trieuba63ce62011-09-09 01:45:06 +00007011 !(LHSType->isBlockPointerType() && IsRelational) &&
Richard Trieub80728f2011-09-06 21:43:51 +00007012 !LHS.get()->getLocStart().isMacroID() &&
7013 !RHS.get()->getLocStart().isMacroID()) {
Chris Lattner222b8bd2009-03-08 19:39:53 +00007014 // For non-floating point types, check for self-comparisons of the form
7015 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
7016 // often indicate logic errors in the program.
Chandler Carruth65a38182010-07-12 06:23:38 +00007017 //
7018 // NOTE: Don't warn about comparison expressions resulting from macro
7019 // expansion. Also don't warn about comparisons which are only self
7020 // comparisons within a template specialization. The warnings should catch
7021 // obvious cases in the definition of the template anyways. The idea is to
7022 // warn when the typed comparison operator will always evaluate to the same
7023 // result.
Chandler Carruth17773fc2010-07-10 12:30:03 +00007024 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) {
Douglas Gregorec170db2010-06-08 19:50:34 +00007025 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) {
Ted Kremenek853734e2010-09-16 00:03:01 +00007026 if (DRL->getDecl() == DRR->getDecl() &&
Chandler Carruth17773fc2010-07-10 12:30:03 +00007027 !IsWithinTemplateSpecialization(DRL->getDecl())) {
Ted Kremenek3427fac2011-02-23 01:52:04 +00007028 DiagRuntimeBehavior(Loc, 0, PDiag(diag::warn_comparison_always)
Douglas Gregorec170db2010-06-08 19:50:34 +00007029 << 0 // self-
John McCalle3027922010-08-25 11:45:40 +00007030 << (Opc == BO_EQ
7031 || Opc == BO_LE
7032 || Opc == BO_GE));
Richard Trieub80728f2011-09-06 21:43:51 +00007033 } else if (LHSType->isArrayType() && RHSType->isArrayType() &&
Douglas Gregorec170db2010-06-08 19:50:34 +00007034 !DRL->getDecl()->getType()->isReferenceType() &&
7035 !DRR->getDecl()->getType()->isReferenceType()) {
7036 // what is it always going to eval to?
7037 char always_evals_to;
7038 switch(Opc) {
John McCalle3027922010-08-25 11:45:40 +00007039 case BO_EQ: // e.g. array1 == array2
Douglas Gregorec170db2010-06-08 19:50:34 +00007040 always_evals_to = 0; // false
7041 break;
John McCalle3027922010-08-25 11:45:40 +00007042 case BO_NE: // e.g. array1 != array2
Douglas Gregorec170db2010-06-08 19:50:34 +00007043 always_evals_to = 1; // true
7044 break;
7045 default:
7046 // best we can say is 'a constant'
7047 always_evals_to = 2; // e.g. array1 <= array2
7048 break;
7049 }
Ted Kremenek3427fac2011-02-23 01:52:04 +00007050 DiagRuntimeBehavior(Loc, 0, PDiag(diag::warn_comparison_always)
Douglas Gregorec170db2010-06-08 19:50:34 +00007051 << 1 // array
7052 << always_evals_to);
7053 }
7054 }
Chandler Carruth17773fc2010-07-10 12:30:03 +00007055 }
Mike Stump11289f42009-09-09 15:08:12 +00007056
Chris Lattner222b8bd2009-03-08 19:39:53 +00007057 if (isa<CastExpr>(LHSStripped))
7058 LHSStripped = LHSStripped->IgnoreParenCasts();
7059 if (isa<CastExpr>(RHSStripped))
7060 RHSStripped = RHSStripped->IgnoreParenCasts();
Mike Stump11289f42009-09-09 15:08:12 +00007061
Chris Lattner222b8bd2009-03-08 19:39:53 +00007062 // Warn about comparisons against a string constant (unless the other
7063 // operand is null), the user probably wants strcmp.
Douglas Gregor7a5bc762009-04-06 18:45:53 +00007064 Expr *literalString = 0;
7065 Expr *literalStringStripped = 0;
Chris Lattner222b8bd2009-03-08 19:39:53 +00007066 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) &&
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00007067 !RHSStripped->isNullPointerConstant(Context,
Douglas Gregor56751b52009-09-25 04:25:58 +00007068 Expr::NPC_ValueDependentIsNull)) {
Richard Trieub80728f2011-09-06 21:43:51 +00007069 literalString = LHS.get();
Douglas Gregor7a5bc762009-04-06 18:45:53 +00007070 literalStringStripped = LHSStripped;
Mike Stump12b8ce12009-08-04 21:02:39 +00007071 } else if ((isa<StringLiteral>(RHSStripped) ||
7072 isa<ObjCEncodeExpr>(RHSStripped)) &&
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00007073 !LHSStripped->isNullPointerConstant(Context,
Douglas Gregor56751b52009-09-25 04:25:58 +00007074 Expr::NPC_ValueDependentIsNull)) {
Richard Trieub80728f2011-09-06 21:43:51 +00007075 literalString = RHS.get();
Douglas Gregor7a5bc762009-04-06 18:45:53 +00007076 literalStringStripped = RHSStripped;
7077 }
7078
7079 if (literalString) {
7080 std::string resultComparison;
7081 switch (Opc) {
John McCalle3027922010-08-25 11:45:40 +00007082 case BO_LT: resultComparison = ") < 0"; break;
7083 case BO_GT: resultComparison = ") > 0"; break;
7084 case BO_LE: resultComparison = ") <= 0"; break;
7085 case BO_GE: resultComparison = ") >= 0"; break;
7086 case BO_EQ: resultComparison = ") == 0"; break;
7087 case BO_NE: resultComparison = ") != 0"; break;
David Blaikie83d382b2011-09-23 05:06:16 +00007088 default: llvm_unreachable("Invalid comparison operator");
Douglas Gregor7a5bc762009-04-06 18:45:53 +00007089 }
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00007090
Ted Kremenek3427fac2011-02-23 01:52:04 +00007091 DiagRuntimeBehavior(Loc, 0,
Douglas Gregor49862b82010-01-12 23:18:54 +00007092 PDiag(diag::warn_stringcompare)
7093 << isa<ObjCEncodeExpr>(literalStringStripped)
Ted Kremenek800b66b2010-04-09 20:26:53 +00007094 << literalString->getSourceRange());
Douglas Gregor7a5bc762009-04-06 18:45:53 +00007095 }
Ted Kremeneke451eae2007-10-29 16:58:49 +00007096 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00007097
Douglas Gregorec170db2010-06-08 19:50:34 +00007098 // C99 6.5.8p3 / C99 6.5.9p4
Richard Trieub80728f2011-09-06 21:43:51 +00007099 if (LHS.get()->getType()->isArithmeticType() &&
7100 RHS.get()->getType()->isArithmeticType()) {
7101 UsualArithmeticConversions(LHS, RHS);
7102 if (LHS.isInvalid() || RHS.isInvalid())
John Wiegley01296292011-04-08 18:41:53 +00007103 return QualType();
7104 }
Douglas Gregorec170db2010-06-08 19:50:34 +00007105 else {
Richard Trieub80728f2011-09-06 21:43:51 +00007106 LHS = UsualUnaryConversions(LHS.take());
7107 if (LHS.isInvalid())
John Wiegley01296292011-04-08 18:41:53 +00007108 return QualType();
7109
Richard Trieub80728f2011-09-06 21:43:51 +00007110 RHS = UsualUnaryConversions(RHS.take());
7111 if (RHS.isInvalid())
John Wiegley01296292011-04-08 18:41:53 +00007112 return QualType();
Douglas Gregorec170db2010-06-08 19:50:34 +00007113 }
7114
Richard Trieub80728f2011-09-06 21:43:51 +00007115 LHSType = LHS.get()->getType();
7116 RHSType = RHS.get()->getType();
Douglas Gregorec170db2010-06-08 19:50:34 +00007117
Douglas Gregorca63811b2008-11-19 03:25:36 +00007118 // The result of comparisons is 'bool' in C++, 'int' in C.
Argyrios Kyrtzidis1bdd6882011-02-18 20:55:15 +00007119 QualType ResultTy = Context.getLogicalOperationType();
Douglas Gregorca63811b2008-11-19 03:25:36 +00007120
Richard Trieuba63ce62011-09-09 01:45:06 +00007121 if (IsRelational) {
Richard Trieub80728f2011-09-06 21:43:51 +00007122 if (LHSType->isRealType() && RHSType->isRealType())
Douglas Gregorca63811b2008-11-19 03:25:36 +00007123 return ResultTy;
Chris Lattnerb620c342007-08-26 01:18:55 +00007124 } else {
Ted Kremeneke2763b02007-10-29 17:13:39 +00007125 // Check for comparisons of floating point operands using != and ==.
Richard Trieub80728f2011-09-06 21:43:51 +00007126 if (LHSType->hasFloatingRepresentation())
7127 CheckFloatComparison(Loc, LHS.get(), RHS.get());
Mike Stump4e1f26a2009-02-19 03:04:26 +00007128
Richard Trieub80728f2011-09-06 21:43:51 +00007129 if (LHSType->isArithmeticType() && RHSType->isArithmeticType())
Douglas Gregorca63811b2008-11-19 03:25:36 +00007130 return ResultTy;
Chris Lattnerb620c342007-08-26 01:18:55 +00007131 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00007132
Richard Trieub80728f2011-09-06 21:43:51 +00007133 bool LHSIsNull = LHS.get()->isNullPointerConstant(Context,
Douglas Gregor56751b52009-09-25 04:25:58 +00007134 Expr::NPC_ValueDependentIsNull);
Richard Trieub80728f2011-09-06 21:43:51 +00007135 bool RHSIsNull = RHS.get()->isNullPointerConstant(Context,
Douglas Gregor56751b52009-09-25 04:25:58 +00007136 Expr::NPC_ValueDependentIsNull);
Mike Stump4e1f26a2009-02-19 03:04:26 +00007137
Douglas Gregorf267edd2010-06-15 21:38:40 +00007138 // All of the following pointer-related warnings are GCC extensions, except
7139 // when handling null pointer constants.
Richard Trieub80728f2011-09-06 21:43:51 +00007140 if (LHSType->isPointerType() && RHSType->isPointerType()) { // C99 6.5.8p2
Chris Lattner3a0702e2008-04-03 05:07:25 +00007141 QualType LCanPointeeTy =
John McCall9320b872011-09-09 05:25:32 +00007142 LHSType->castAs<PointerType>()->getPointeeType().getCanonicalType();
Chris Lattner3a0702e2008-04-03 05:07:25 +00007143 QualType RCanPointeeTy =
John McCall9320b872011-09-09 05:25:32 +00007144 RHSType->castAs<PointerType>()->getPointeeType().getCanonicalType();
Mike Stump4e1f26a2009-02-19 03:04:26 +00007145
David Blaikiebbafb8a2012-03-11 07:00:24 +00007146 if (getLangOpts().CPlusPlus) {
Eli Friedman16c209612009-08-23 00:27:47 +00007147 if (LCanPointeeTy == RCanPointeeTy)
7148 return ResultTy;
Richard Trieuba63ce62011-09-09 01:45:06 +00007149 if (!IsRelational &&
Fariborz Jahanianffc420c2009-12-21 18:19:17 +00007150 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
7151 // Valid unless comparison between non-null pointer and function pointer
7152 // This is a gcc extension compatibility comparison.
Douglas Gregorf267edd2010-06-15 21:38:40 +00007153 // In a SFINAE context, we treat this as a hard error to maintain
7154 // conformance with the C++ standard.
Fariborz Jahanianffc420c2009-12-21 18:19:17 +00007155 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
7156 && !LHSIsNull && !RHSIsNull) {
Richard Trieudd82a5c2011-09-02 02:55:45 +00007157 diagnoseFunctionPointerToVoidComparison(
Richard Trieub80728f2011-09-06 21:43:51 +00007158 *this, Loc, LHS, RHS, /*isError*/ isSFINAEContext());
Douglas Gregorf267edd2010-06-15 21:38:40 +00007159
7160 if (isSFINAEContext())
7161 return QualType();
7162
Richard Trieub80728f2011-09-06 21:43:51 +00007163 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
Fariborz Jahanianffc420c2009-12-21 18:19:17 +00007164 return ResultTy;
7165 }
7166 }
Anders Carlssona95069c2010-11-04 03:17:43 +00007167
Richard Trieub80728f2011-09-06 21:43:51 +00007168 if (convertPointersToCompositeType(*this, Loc, LHS, RHS))
Douglas Gregor5b07c7e2009-05-04 06:07:12 +00007169 return QualType();
Richard Trieudd82a5c2011-09-02 02:55:45 +00007170 else
7171 return ResultTy;
Douglas Gregor5b07c7e2009-05-04 06:07:12 +00007172 }
Eli Friedman16c209612009-08-23 00:27:47 +00007173 // C99 6.5.9p2 and C99 6.5.8p2
7174 if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(),
7175 RCanPointeeTy.getUnqualifiedType())) {
7176 // Valid unless a relational comparison of function pointers
Richard Trieuba63ce62011-09-09 01:45:06 +00007177 if (IsRelational && LCanPointeeTy->isFunctionType()) {
Eli Friedman16c209612009-08-23 00:27:47 +00007178 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers)
Richard Trieub80728f2011-09-06 21:43:51 +00007179 << LHSType << RHSType << LHS.get()->getSourceRange()
7180 << RHS.get()->getSourceRange();
Eli Friedman16c209612009-08-23 00:27:47 +00007181 }
Richard Trieuba63ce62011-09-09 01:45:06 +00007182 } else if (!IsRelational &&
Eli Friedman16c209612009-08-23 00:27:47 +00007183 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
7184 // Valid unless comparison between non-null pointer and function pointer
7185 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
Richard Trieudd82a5c2011-09-02 02:55:45 +00007186 && !LHSIsNull && !RHSIsNull)
Richard Trieub80728f2011-09-06 21:43:51 +00007187 diagnoseFunctionPointerToVoidComparison(*this, Loc, LHS, RHS,
Richard Trieudd82a5c2011-09-02 02:55:45 +00007188 /*isError*/false);
Eli Friedman16c209612009-08-23 00:27:47 +00007189 } else {
7190 // Invalid
Richard Trieub80728f2011-09-06 21:43:51 +00007191 diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS, /*isError*/false);
Steve Naroff75c17232007-06-13 21:41:08 +00007192 }
John McCall7684dde2011-03-11 04:25:25 +00007193 if (LCanPointeeTy != RCanPointeeTy) {
7194 if (LHSIsNull && !RHSIsNull)
Richard Trieub80728f2011-09-06 21:43:51 +00007195 LHS = ImpCastExprToType(LHS.take(), RHSType, CK_BitCast);
John McCall7684dde2011-03-11 04:25:25 +00007196 else
Richard Trieub80728f2011-09-06 21:43:51 +00007197 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
John McCall7684dde2011-03-11 04:25:25 +00007198 }
Douglas Gregorca63811b2008-11-19 03:25:36 +00007199 return ResultTy;
Steve Naroffcdee44c2007-08-16 21:48:38 +00007200 }
Mike Stump11289f42009-09-09 15:08:12 +00007201
David Blaikiebbafb8a2012-03-11 07:00:24 +00007202 if (getLangOpts().CPlusPlus) {
Anders Carlssona95069c2010-11-04 03:17:43 +00007203 // Comparison of nullptr_t with itself.
Richard Trieub80728f2011-09-06 21:43:51 +00007204 if (LHSType->isNullPtrType() && RHSType->isNullPtrType())
Anders Carlssona95069c2010-11-04 03:17:43 +00007205 return ResultTy;
7206
Mike Stump11289f42009-09-09 15:08:12 +00007207 // Comparison of pointers with null pointer constants and equality
Douglas Gregorb00b10e2009-08-24 17:42:35 +00007208 // comparisons of member pointers to null pointer constants.
Mike Stump11289f42009-09-09 15:08:12 +00007209 if (RHSIsNull &&
Richard Trieub80728f2011-09-06 21:43:51 +00007210 ((LHSType->isAnyPointerType() || LHSType->isNullPtrType()) ||
Richard Trieuba63ce62011-09-09 01:45:06 +00007211 (!IsRelational &&
Richard Trieub80728f2011-09-06 21:43:51 +00007212 (LHSType->isMemberPointerType() || LHSType->isBlockPointerType())))) {
7213 RHS = ImpCastExprToType(RHS.take(), LHSType,
7214 LHSType->isMemberPointerType()
John McCalle3027922010-08-25 11:45:40 +00007215 ? CK_NullToMemberPointer
John McCalle84af4e2010-11-13 01:35:44 +00007216 : CK_NullToPointer);
Sebastian Redl576fd422009-05-10 18:38:11 +00007217 return ResultTy;
7218 }
Douglas Gregorb00b10e2009-08-24 17:42:35 +00007219 if (LHSIsNull &&
Richard Trieub80728f2011-09-06 21:43:51 +00007220 ((RHSType->isAnyPointerType() || RHSType->isNullPtrType()) ||
Richard Trieuba63ce62011-09-09 01:45:06 +00007221 (!IsRelational &&
Richard Trieub80728f2011-09-06 21:43:51 +00007222 (RHSType->isMemberPointerType() || RHSType->isBlockPointerType())))) {
7223 LHS = ImpCastExprToType(LHS.take(), RHSType,
7224 RHSType->isMemberPointerType()
John McCalle3027922010-08-25 11:45:40 +00007225 ? CK_NullToMemberPointer
John McCalle84af4e2010-11-13 01:35:44 +00007226 : CK_NullToPointer);
Sebastian Redl576fd422009-05-10 18:38:11 +00007227 return ResultTy;
7228 }
Douglas Gregorb00b10e2009-08-24 17:42:35 +00007229
7230 // Comparison of member pointers.
Richard Trieuba63ce62011-09-09 01:45:06 +00007231 if (!IsRelational &&
Richard Trieub80728f2011-09-06 21:43:51 +00007232 LHSType->isMemberPointerType() && RHSType->isMemberPointerType()) {
7233 if (convertPointersToCompositeType(*this, Loc, LHS, RHS))
Douglas Gregorb00b10e2009-08-24 17:42:35 +00007234 return QualType();
Richard Trieudd82a5c2011-09-02 02:55:45 +00007235 else
7236 return ResultTy;
Douglas Gregorb00b10e2009-08-24 17:42:35 +00007237 }
Douglas Gregor48e6bbf2011-03-01 17:16:20 +00007238
7239 // Handle scoped enumeration types specifically, since they don't promote
7240 // to integers.
Richard Trieub80728f2011-09-06 21:43:51 +00007241 if (LHS.get()->getType()->isEnumeralType() &&
7242 Context.hasSameUnqualifiedType(LHS.get()->getType(),
7243 RHS.get()->getType()))
Douglas Gregor48e6bbf2011-03-01 17:16:20 +00007244 return ResultTy;
Sebastian Redl576fd422009-05-10 18:38:11 +00007245 }
Mike Stump11289f42009-09-09 15:08:12 +00007246
Steve Naroff081c7422008-09-04 15:10:53 +00007247 // Handle block pointer types.
Richard Trieuba63ce62011-09-09 01:45:06 +00007248 if (!IsRelational && LHSType->isBlockPointerType() &&
Richard Trieub80728f2011-09-06 21:43:51 +00007249 RHSType->isBlockPointerType()) {
John McCall9320b872011-09-09 05:25:32 +00007250 QualType lpointee = LHSType->castAs<BlockPointerType>()->getPointeeType();
7251 QualType rpointee = RHSType->castAs<BlockPointerType>()->getPointeeType();
Mike Stump4e1f26a2009-02-19 03:04:26 +00007252
Steve Naroff081c7422008-09-04 15:10:53 +00007253 if (!LHSIsNull && !RHSIsNull &&
Eli Friedmana6638ca2009-06-08 05:08:54 +00007254 !Context.typesAreCompatible(lpointee, rpointee)) {
Chris Lattner377d1f82008-11-18 22:52:51 +00007255 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
Richard Trieub80728f2011-09-06 21:43:51 +00007256 << LHSType << RHSType << LHS.get()->getSourceRange()
7257 << RHS.get()->getSourceRange();
Steve Naroff081c7422008-09-04 15:10:53 +00007258 }
Richard Trieub80728f2011-09-06 21:43:51 +00007259 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
Douglas Gregorca63811b2008-11-19 03:25:36 +00007260 return ResultTy;
Steve Naroff081c7422008-09-04 15:10:53 +00007261 }
John Wiegley01296292011-04-08 18:41:53 +00007262
Steve Naroffe18f94c2008-09-28 01:11:11 +00007263 // Allow block pointers to be compared with null pointer constants.
Richard Trieuba63ce62011-09-09 01:45:06 +00007264 if (!IsRelational
Richard Trieub80728f2011-09-06 21:43:51 +00007265 && ((LHSType->isBlockPointerType() && RHSType->isPointerType())
7266 || (LHSType->isPointerType() && RHSType->isBlockPointerType()))) {
Steve Naroffe18f94c2008-09-28 01:11:11 +00007267 if (!LHSIsNull && !RHSIsNull) {
Richard Trieub80728f2011-09-06 21:43:51 +00007268 if (!((RHSType->isPointerType() && RHSType->castAs<PointerType>()
Mike Stump1b821b42009-05-07 03:14:14 +00007269 ->getPointeeType()->isVoidType())
Richard Trieub80728f2011-09-06 21:43:51 +00007270 || (LHSType->isPointerType() && LHSType->castAs<PointerType>()
Mike Stump1b821b42009-05-07 03:14:14 +00007271 ->getPointeeType()->isVoidType())))
7272 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
Richard Trieub80728f2011-09-06 21:43:51 +00007273 << LHSType << RHSType << LHS.get()->getSourceRange()
7274 << RHS.get()->getSourceRange();
Steve Naroffe18f94c2008-09-28 01:11:11 +00007275 }
John McCall7684dde2011-03-11 04:25:25 +00007276 if (LHSIsNull && !RHSIsNull)
John McCall9320b872011-09-09 05:25:32 +00007277 LHS = ImpCastExprToType(LHS.take(), RHSType,
7278 RHSType->isPointerType() ? CK_BitCast
7279 : CK_AnyPointerToBlockPointerCast);
John McCall7684dde2011-03-11 04:25:25 +00007280 else
John McCall9320b872011-09-09 05:25:32 +00007281 RHS = ImpCastExprToType(RHS.take(), LHSType,
7282 LHSType->isPointerType() ? CK_BitCast
7283 : CK_AnyPointerToBlockPointerCast);
Douglas Gregorca63811b2008-11-19 03:25:36 +00007284 return ResultTy;
Steve Naroffe18f94c2008-09-28 01:11:11 +00007285 }
Steve Naroff081c7422008-09-04 15:10:53 +00007286
Richard Trieub80728f2011-09-06 21:43:51 +00007287 if (LHSType->isObjCObjectPointerType() ||
7288 RHSType->isObjCObjectPointerType()) {
7289 const PointerType *LPT = LHSType->getAs<PointerType>();
7290 const PointerType *RPT = RHSType->getAs<PointerType>();
John McCall7684dde2011-03-11 04:25:25 +00007291 if (LPT || RPT) {
7292 bool LPtrToVoid = LPT ? LPT->getPointeeType()->isVoidType() : false;
7293 bool RPtrToVoid = RPT ? RPT->getPointeeType()->isVoidType() : false;
Mike Stump4e1f26a2009-02-19 03:04:26 +00007294
Steve Naroff753567f2008-11-17 19:49:16 +00007295 if (!LPtrToVoid && !RPtrToVoid &&
Richard Trieub80728f2011-09-06 21:43:51 +00007296 !Context.typesAreCompatible(LHSType, RHSType)) {
7297 diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS,
Richard Trieudd82a5c2011-09-02 02:55:45 +00007298 /*isError*/false);
Steve Naroff1d4a9a32008-10-27 10:33:19 +00007299 }
John McCall7684dde2011-03-11 04:25:25 +00007300 if (LHSIsNull && !RHSIsNull)
John McCall9320b872011-09-09 05:25:32 +00007301 LHS = ImpCastExprToType(LHS.take(), RHSType,
7302 RPT ? CK_BitCast :CK_CPointerToObjCPointerCast);
John McCall7684dde2011-03-11 04:25:25 +00007303 else
John McCall9320b872011-09-09 05:25:32 +00007304 RHS = ImpCastExprToType(RHS.take(), LHSType,
7305 LPT ? CK_BitCast :CK_CPointerToObjCPointerCast);
Douglas Gregorca63811b2008-11-19 03:25:36 +00007306 return ResultTy;
Steve Naroffea54d9e2008-10-20 18:19:10 +00007307 }
Richard Trieub80728f2011-09-06 21:43:51 +00007308 if (LHSType->isObjCObjectPointerType() &&
7309 RHSType->isObjCObjectPointerType()) {
7310 if (!Context.areComparableObjCPointerTypes(LHSType, RHSType))
7311 diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS,
Richard Trieudd82a5c2011-09-02 02:55:45 +00007312 /*isError*/false);
Jordan Rosed49a33e2012-06-08 21:14:25 +00007313 if (isObjCObjectLiteral(LHS) || isObjCObjectLiteral(RHS))
Jordan Rose7660f782012-07-17 17:46:40 +00007314 diagnoseObjCLiteralComparison(*this, Loc, LHS, RHS, Opc);
Jordan Rosed49a33e2012-06-08 21:14:25 +00007315
John McCall7684dde2011-03-11 04:25:25 +00007316 if (LHSIsNull && !RHSIsNull)
Richard Trieub80728f2011-09-06 21:43:51 +00007317 LHS = ImpCastExprToType(LHS.take(), RHSType, CK_BitCast);
John McCall7684dde2011-03-11 04:25:25 +00007318 else
Richard Trieub80728f2011-09-06 21:43:51 +00007319 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
Douglas Gregorca63811b2008-11-19 03:25:36 +00007320 return ResultTy;
Steve Naroffb788d9b2008-06-03 14:04:54 +00007321 }
Fariborz Jahanian134cbef2007-12-20 01:06:58 +00007322 }
Richard Trieub80728f2011-09-06 21:43:51 +00007323 if ((LHSType->isAnyPointerType() && RHSType->isIntegerType()) ||
7324 (LHSType->isIntegerType() && RHSType->isAnyPointerType())) {
Chris Lattnerd99bd522009-08-23 00:03:44 +00007325 unsigned DiagID = 0;
Douglas Gregorf267edd2010-06-15 21:38:40 +00007326 bool isError = false;
Douglas Gregor0064c592012-09-14 04:35:37 +00007327 if (LangOpts.DebuggerSupport) {
7328 // Under a debugger, allow the comparison of pointers to integers,
7329 // since users tend to want to compare addresses.
7330 } else if ((LHSIsNull && LHSType->isIntegerType()) ||
Richard Trieub80728f2011-09-06 21:43:51 +00007331 (RHSIsNull && RHSType->isIntegerType())) {
David Blaikiebbafb8a2012-03-11 07:00:24 +00007332 if (IsRelational && !getLangOpts().CPlusPlus)
Chris Lattnerd99bd522009-08-23 00:03:44 +00007333 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero;
David Blaikiebbafb8a2012-03-11 07:00:24 +00007334 } else if (IsRelational && !getLangOpts().CPlusPlus)
Chris Lattnerd99bd522009-08-23 00:03:44 +00007335 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer;
David Blaikiebbafb8a2012-03-11 07:00:24 +00007336 else if (getLangOpts().CPlusPlus) {
Douglas Gregorf267edd2010-06-15 21:38:40 +00007337 DiagID = diag::err_typecheck_comparison_of_pointer_integer;
7338 isError = true;
7339 } else
Chris Lattnerd99bd522009-08-23 00:03:44 +00007340 DiagID = diag::ext_typecheck_comparison_of_pointer_integer;
Mike Stump11289f42009-09-09 15:08:12 +00007341
Chris Lattnerd99bd522009-08-23 00:03:44 +00007342 if (DiagID) {
Chris Lattnerf8344db2009-08-22 18:58:31 +00007343 Diag(Loc, DiagID)
Richard Trieub80728f2011-09-06 21:43:51 +00007344 << LHSType << RHSType << LHS.get()->getSourceRange()
7345 << RHS.get()->getSourceRange();
Douglas Gregorf267edd2010-06-15 21:38:40 +00007346 if (isError)
7347 return QualType();
Chris Lattnerf8344db2009-08-22 18:58:31 +00007348 }
Douglas Gregorf267edd2010-06-15 21:38:40 +00007349
Richard Trieub80728f2011-09-06 21:43:51 +00007350 if (LHSType->isIntegerType())
7351 LHS = ImpCastExprToType(LHS.take(), RHSType,
John McCalle84af4e2010-11-13 01:35:44 +00007352 LHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
Chris Lattnerd99bd522009-08-23 00:03:44 +00007353 else
Richard Trieub80728f2011-09-06 21:43:51 +00007354 RHS = ImpCastExprToType(RHS.take(), LHSType,
John McCalle84af4e2010-11-13 01:35:44 +00007355 RHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
Douglas Gregorca63811b2008-11-19 03:25:36 +00007356 return ResultTy;
Steve Naroff043d45d2007-05-15 02:32:35 +00007357 }
Douglas Gregorf267edd2010-06-15 21:38:40 +00007358
Steve Naroff4b191572008-09-04 16:56:14 +00007359 // Handle block pointers.
Richard Trieuba63ce62011-09-09 01:45:06 +00007360 if (!IsRelational && RHSIsNull
Richard Trieub80728f2011-09-06 21:43:51 +00007361 && LHSType->isBlockPointerType() && RHSType->isIntegerType()) {
7362 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_NullToPointer);
Douglas Gregorca63811b2008-11-19 03:25:36 +00007363 return ResultTy;
Steve Naroff4b191572008-09-04 16:56:14 +00007364 }
Richard Trieuba63ce62011-09-09 01:45:06 +00007365 if (!IsRelational && LHSIsNull
Richard Trieub80728f2011-09-06 21:43:51 +00007366 && LHSType->isIntegerType() && RHSType->isBlockPointerType()) {
7367 LHS = ImpCastExprToType(LHS.take(), RHSType, CK_NullToPointer);
Douglas Gregorca63811b2008-11-19 03:25:36 +00007368 return ResultTy;
Steve Naroff4b191572008-09-04 16:56:14 +00007369 }
Douglas Gregor48e6bbf2011-03-01 17:16:20 +00007370
Richard Trieub80728f2011-09-06 21:43:51 +00007371 return InvalidOperands(Loc, LHS, RHS);
Steve Naroff26c8ea52007-03-21 21:08:52 +00007372}
7373
Tanya Lattner20248222012-01-16 21:02:28 +00007374
7375// Return a signed type that is of identical size and number of elements.
7376// For floating point vectors, return an integer type of identical size
7377// and number of elements.
7378QualType Sema::GetSignedVectorType(QualType V) {
7379 const VectorType *VTy = V->getAs<VectorType>();
7380 unsigned TypeSize = Context.getTypeSize(VTy->getElementType());
7381 if (TypeSize == Context.getTypeSize(Context.CharTy))
7382 return Context.getExtVectorType(Context.CharTy, VTy->getNumElements());
7383 else if (TypeSize == Context.getTypeSize(Context.ShortTy))
7384 return Context.getExtVectorType(Context.ShortTy, VTy->getNumElements());
7385 else if (TypeSize == Context.getTypeSize(Context.IntTy))
7386 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements());
7387 else if (TypeSize == Context.getTypeSize(Context.LongTy))
7388 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements());
7389 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) &&
7390 "Unhandled vector element size in vector compare");
7391 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements());
7392}
7393
Nate Begeman191a6b12008-07-14 18:02:46 +00007394/// CheckVectorCompareOperands - vector comparisons are a clang extension that
Mike Stump4e1f26a2009-02-19 03:04:26 +00007395/// operates on extended vector types. Instead of producing an IntTy result,
Nate Begeman191a6b12008-07-14 18:02:46 +00007396/// like a scalar comparison, a vector comparison produces a vector of integer
7397/// types.
Richard Trieubcce2f72011-09-07 01:19:57 +00007398QualType Sema::CheckVectorCompareOperands(ExprResult &LHS, ExprResult &RHS,
Chris Lattner326f7572008-11-18 01:30:42 +00007399 SourceLocation Loc,
Richard Trieuba63ce62011-09-09 01:45:06 +00007400 bool IsRelational) {
Nate Begeman191a6b12008-07-14 18:02:46 +00007401 // Check to make sure we're operating on vectors of the same type and width,
7402 // Allowing one side to be a scalar of element type.
Richard Trieubcce2f72011-09-07 01:19:57 +00007403 QualType vType = CheckVectorOperands(LHS, RHS, Loc, /*isCompAssign*/false);
Nate Begeman191a6b12008-07-14 18:02:46 +00007404 if (vType.isNull())
7405 return vType;
Mike Stump4e1f26a2009-02-19 03:04:26 +00007406
Richard Trieubcce2f72011-09-07 01:19:57 +00007407 QualType LHSType = LHS.get()->getType();
Mike Stump4e1f26a2009-02-19 03:04:26 +00007408
Anton Yartsev530deb92011-03-27 15:36:07 +00007409 // If AltiVec, the comparison results in a numeric type, i.e.
7410 // bool for C++, int for C
Anton Yartsev93900c72011-03-28 21:00:05 +00007411 if (vType->getAs<VectorType>()->getVectorKind() == VectorType::AltiVecVector)
Anton Yartsev530deb92011-03-27 15:36:07 +00007412 return Context.getLogicalOperationType();
7413
Nate Begeman191a6b12008-07-14 18:02:46 +00007414 // For non-floating point types, check for self-comparisons of the form
7415 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
7416 // often indicate logic errors in the program.
Richard Trieubcce2f72011-09-07 01:19:57 +00007417 if (!LHSType->hasFloatingRepresentation()) {
Richard Smith508ebf32011-10-28 03:31:48 +00007418 if (DeclRefExpr* DRL
7419 = dyn_cast<DeclRefExpr>(LHS.get()->IgnoreParenImpCasts()))
7420 if (DeclRefExpr* DRR
7421 = dyn_cast<DeclRefExpr>(RHS.get()->IgnoreParenImpCasts()))
Nate Begeman191a6b12008-07-14 18:02:46 +00007422 if (DRL->getDecl() == DRR->getDecl())
Ted Kremenek3427fac2011-02-23 01:52:04 +00007423 DiagRuntimeBehavior(Loc, 0,
Douglas Gregorec170db2010-06-08 19:50:34 +00007424 PDiag(diag::warn_comparison_always)
7425 << 0 // self-
7426 << 2 // "a constant"
7427 );
Nate Begeman191a6b12008-07-14 18:02:46 +00007428 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00007429
Nate Begeman191a6b12008-07-14 18:02:46 +00007430 // Check for comparisons of floating point operands using != and ==.
Richard Trieuba63ce62011-09-09 01:45:06 +00007431 if (!IsRelational && LHSType->hasFloatingRepresentation()) {
David Blaikieca043222012-01-16 05:16:03 +00007432 assert (RHS.get()->getType()->hasFloatingRepresentation());
Richard Trieubcce2f72011-09-07 01:19:57 +00007433 CheckFloatComparison(Loc, LHS.get(), RHS.get());
Nate Begeman191a6b12008-07-14 18:02:46 +00007434 }
Tanya Lattner20248222012-01-16 21:02:28 +00007435
7436 // Return a signed type for the vector.
7437 return GetSignedVectorType(LHSType);
7438}
Mike Stump4e1f26a2009-02-19 03:04:26 +00007439
Tanya Lattner3dd33b22012-01-19 01:16:16 +00007440QualType Sema::CheckVectorLogicalOperands(ExprResult &LHS, ExprResult &RHS,
7441 SourceLocation Loc) {
Tanya Lattner20248222012-01-16 21:02:28 +00007442 // Ensure that either both operands are of the same vector type, or
7443 // one operand is of a vector type and the other is of its element type.
7444 QualType vType = CheckVectorOperands(LHS, RHS, Loc, false);
7445 if (vType.isNull() || vType->isFloatingType())
7446 return InvalidOperands(Loc, LHS, RHS);
7447
7448 return GetSignedVectorType(LHS.get()->getType());
Nate Begeman191a6b12008-07-14 18:02:46 +00007449}
7450
Steve Naroff218bc2b2007-05-04 21:54:46 +00007451inline QualType Sema::CheckBitwiseOperands(
Richard Trieuba63ce62011-09-09 01:45:06 +00007452 ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign) {
Richard Trieuf8916e12011-09-16 00:53:10 +00007453 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
7454
Richard Trieubcce2f72011-09-07 01:19:57 +00007455 if (LHS.get()->getType()->isVectorType() ||
7456 RHS.get()->getType()->isVectorType()) {
7457 if (LHS.get()->getType()->hasIntegerRepresentation() &&
7458 RHS.get()->getType()->hasIntegerRepresentation())
Richard Trieuba63ce62011-09-09 01:45:06 +00007459 return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign);
Douglas Gregor5cc2c8b2010-07-23 15:58:24 +00007460
Richard Trieubcce2f72011-09-07 01:19:57 +00007461 return InvalidOperands(Loc, LHS, RHS);
Douglas Gregor5cc2c8b2010-07-23 15:58:24 +00007462 }
Steve Naroffb8ea4fb2007-07-13 23:32:42 +00007463
Richard Trieubcce2f72011-09-07 01:19:57 +00007464 ExprResult LHSResult = Owned(LHS), RHSResult = Owned(RHS);
7465 QualType compType = UsualArithmeticConversions(LHSResult, RHSResult,
Richard Trieuba63ce62011-09-09 01:45:06 +00007466 IsCompAssign);
Richard Trieubcce2f72011-09-07 01:19:57 +00007467 if (LHSResult.isInvalid() || RHSResult.isInvalid())
John Wiegley01296292011-04-08 18:41:53 +00007468 return QualType();
Richard Trieubcce2f72011-09-07 01:19:57 +00007469 LHS = LHSResult.take();
7470 RHS = RHSResult.take();
Mike Stump4e1f26a2009-02-19 03:04:26 +00007471
Eli Friedman93ee5ca2012-06-16 02:19:17 +00007472 if (!compType.isNull() && compType->isIntegralOrUnscopedEnumerationType())
Steve Naroffbe4c4d12007-08-24 19:07:16 +00007473 return compType;
Richard Trieubcce2f72011-09-07 01:19:57 +00007474 return InvalidOperands(Loc, LHS, RHS);
Steve Naroff26c8ea52007-03-21 21:08:52 +00007475}
7476
Steve Naroff218bc2b2007-05-04 21:54:46 +00007477inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14]
Richard Trieubcce2f72011-09-07 01:19:57 +00007478 ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, unsigned Opc) {
Chris Lattner8406c512010-07-13 19:41:32 +00007479
Tanya Lattner20248222012-01-16 21:02:28 +00007480 // Check vector operands differently.
7481 if (LHS.get()->getType()->isVectorType() || RHS.get()->getType()->isVectorType())
7482 return CheckVectorLogicalOperands(LHS, RHS, Loc);
7483
Chris Lattner8406c512010-07-13 19:41:32 +00007484 // Diagnose cases where the user write a logical and/or but probably meant a
7485 // bitwise one. We do this when the LHS is a non-bool integer and the RHS
7486 // is a constant.
Richard Trieubcce2f72011-09-07 01:19:57 +00007487 if (LHS.get()->getType()->isIntegerType() &&
7488 !LHS.get()->getType()->isBooleanType() &&
7489 RHS.get()->getType()->isIntegerType() && !RHS.get()->isValueDependent() &&
Richard Trieucfe39262011-07-15 00:00:51 +00007490 // Don't warn in macros or template instantiations.
7491 !Loc.isMacroID() && ActiveTemplateInstantiations.empty()) {
Chris Lattner938533d2010-07-24 01:10:11 +00007492 // If the RHS can be constant folded, and if it constant folds to something
7493 // that isn't 0 or 1 (which indicate a potential logical operation that
7494 // happened to fold to true/false) then warn.
Chandler Carruthe54ff6c2011-05-31 05:41:42 +00007495 // Parens on the RHS are ignored.
Richard Smith00ab3ae2011-10-16 23:01:09 +00007496 llvm::APSInt Result;
7497 if (RHS.get()->EvaluateAsInt(Result, Context))
David Blaikiebbafb8a2012-03-11 07:00:24 +00007498 if ((getLangOpts().Bool && !RHS.get()->getType()->isBooleanType()) ||
Richard Smith00ab3ae2011-10-16 23:01:09 +00007499 (Result != 0 && Result != 1)) {
Chandler Carruthe54ff6c2011-05-31 05:41:42 +00007500 Diag(Loc, diag::warn_logical_instead_of_bitwise)
Richard Trieubcce2f72011-09-07 01:19:57 +00007501 << RHS.get()->getSourceRange()
Matt Beaumont-Gay0a0ba9d2011-08-15 17:50:06 +00007502 << (Opc == BO_LAnd ? "&&" : "||");
7503 // Suggest replacing the logical operator with the bitwise version
7504 Diag(Loc, diag::note_logical_instead_of_bitwise_change_operator)
7505 << (Opc == BO_LAnd ? "&" : "|")
7506 << FixItHint::CreateReplacement(SourceRange(
7507 Loc, Lexer::getLocForEndOfToken(Loc, 0, getSourceManager(),
David Blaikiebbafb8a2012-03-11 07:00:24 +00007508 getLangOpts())),
Matt Beaumont-Gay0a0ba9d2011-08-15 17:50:06 +00007509 Opc == BO_LAnd ? "&" : "|");
7510 if (Opc == BO_LAnd)
7511 // Suggest replacing "Foo() && kNonZero" with "Foo()"
7512 Diag(Loc, diag::note_logical_instead_of_bitwise_remove_constant)
7513 << FixItHint::CreateRemoval(
7514 SourceRange(
Richard Trieubcce2f72011-09-07 01:19:57 +00007515 Lexer::getLocForEndOfToken(LHS.get()->getLocEnd(),
Matt Beaumont-Gay0a0ba9d2011-08-15 17:50:06 +00007516 0, getSourceManager(),
David Blaikiebbafb8a2012-03-11 07:00:24 +00007517 getLangOpts()),
Richard Trieubcce2f72011-09-07 01:19:57 +00007518 RHS.get()->getLocEnd()));
Matt Beaumont-Gay0a0ba9d2011-08-15 17:50:06 +00007519 }
Chris Lattner938533d2010-07-24 01:10:11 +00007520 }
Chris Lattner8406c512010-07-13 19:41:32 +00007521
David Blaikiebbafb8a2012-03-11 07:00:24 +00007522 if (!Context.getLangOpts().CPlusPlus) {
Richard Trieubcce2f72011-09-07 01:19:57 +00007523 LHS = UsualUnaryConversions(LHS.take());
7524 if (LHS.isInvalid())
John Wiegley01296292011-04-08 18:41:53 +00007525 return QualType();
Mike Stump4e1f26a2009-02-19 03:04:26 +00007526
Richard Trieubcce2f72011-09-07 01:19:57 +00007527 RHS = UsualUnaryConversions(RHS.take());
7528 if (RHS.isInvalid())
John Wiegley01296292011-04-08 18:41:53 +00007529 return QualType();
7530
Richard Trieubcce2f72011-09-07 01:19:57 +00007531 if (!LHS.get()->getType()->isScalarType() ||
7532 !RHS.get()->getType()->isScalarType())
7533 return InvalidOperands(Loc, LHS, RHS);
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00007534
Anders Carlsson2e7bc112009-11-23 21:47:44 +00007535 return Context.IntTy;
Anders Carlsson35a99d92009-10-16 01:44:21 +00007536 }
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00007537
John McCall4a2429a2010-06-04 00:29:51 +00007538 // The following is safe because we only use this method for
7539 // non-overloadable operands.
7540
Anders Carlsson2e7bc112009-11-23 21:47:44 +00007541 // C++ [expr.log.and]p1
7542 // C++ [expr.log.or]p1
John McCall4a2429a2010-06-04 00:29:51 +00007543 // The operands are both contextually converted to type bool.
Richard Trieubcce2f72011-09-07 01:19:57 +00007544 ExprResult LHSRes = PerformContextuallyConvertToBool(LHS.get());
7545 if (LHSRes.isInvalid())
7546 return InvalidOperands(Loc, LHS, RHS);
Benjamin Kramer62b95d82012-08-23 21:35:17 +00007547 LHS = LHSRes;
John Wiegley01296292011-04-08 18:41:53 +00007548
Richard Trieubcce2f72011-09-07 01:19:57 +00007549 ExprResult RHSRes = PerformContextuallyConvertToBool(RHS.get());
7550 if (RHSRes.isInvalid())
7551 return InvalidOperands(Loc, LHS, RHS);
Benjamin Kramer62b95d82012-08-23 21:35:17 +00007552 RHS = RHSRes;
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00007553
Anders Carlsson2e7bc112009-11-23 21:47:44 +00007554 // C++ [expr.log.and]p2
7555 // C++ [expr.log.or]p2
7556 // The result is a bool.
7557 return Context.BoolTy;
Steve Naroffae4143e2007-04-26 20:39:23 +00007558}
7559
Fariborz Jahanian8e1555c2009-01-12 19:55:42 +00007560/// IsReadonlyProperty - Verify that otherwise a valid l-value expression
7561/// is a read-only property; return true if so. A readonly property expression
7562/// depends on various declarations and thus must be treated specially.
7563///
Mike Stump11289f42009-09-09 15:08:12 +00007564static bool IsReadonlyProperty(Expr *E, Sema &S) {
John McCall526ab472011-10-25 17:37:35 +00007565 const ObjCPropertyRefExpr *PropExpr = dyn_cast<ObjCPropertyRefExpr>(E);
7566 if (!PropExpr) return false;
7567 if (PropExpr->isImplicitProperty()) return false;
John McCallb7bd14f2010-12-02 01:19:52 +00007568
John McCall526ab472011-10-25 17:37:35 +00007569 ObjCPropertyDecl *PDecl = PropExpr->getExplicitProperty();
7570 QualType BaseType = PropExpr->isSuperReceiver() ?
John McCallb7bd14f2010-12-02 01:19:52 +00007571 PropExpr->getSuperReceiverType() :
Fariborz Jahanian681c0752010-10-14 16:04:05 +00007572 PropExpr->getBase()->getType();
7573
John McCall526ab472011-10-25 17:37:35 +00007574 if (const ObjCObjectPointerType *OPT =
7575 BaseType->getAsObjCInterfacePointerType())
7576 if (ObjCInterfaceDecl *IFace = OPT->getInterfaceDecl())
7577 if (S.isPropertyReadonly(PDecl, IFace))
7578 return true;
Fariborz Jahanian8e1555c2009-01-12 19:55:42 +00007579 return false;
7580}
7581
Fariborz Jahanian071caef2011-03-26 19:48:30 +00007582static bool IsReadonlyMessage(Expr *E, Sema &S) {
John McCall526ab472011-10-25 17:37:35 +00007583 const MemberExpr *ME = dyn_cast<MemberExpr>(E);
7584 if (!ME) return false;
7585 if (!isa<FieldDecl>(ME->getMemberDecl())) return false;
7586 ObjCMessageExpr *Base =
7587 dyn_cast<ObjCMessageExpr>(ME->getBase()->IgnoreParenImpCasts());
7588 if (!Base) return false;
7589 return Base->getMethodDecl() != 0;
Fariborz Jahanian071caef2011-03-26 19:48:30 +00007590}
7591
John McCall5fa2ef42012-03-13 00:37:01 +00007592/// Is the given expression (which must be 'const') a reference to a
7593/// variable which was originally non-const, but which has become
7594/// 'const' due to being captured within a block?
7595enum NonConstCaptureKind { NCCK_None, NCCK_Block, NCCK_Lambda };
7596static NonConstCaptureKind isReferenceToNonConstCapture(Sema &S, Expr *E) {
7597 assert(E->isLValue() && E->getType().isConstQualified());
7598 E = E->IgnoreParens();
7599
7600 // Must be a reference to a declaration from an enclosing scope.
7601 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E);
7602 if (!DRE) return NCCK_None;
7603 if (!DRE->refersToEnclosingLocal()) return NCCK_None;
7604
7605 // The declaration must be a variable which is not declared 'const'.
7606 VarDecl *var = dyn_cast<VarDecl>(DRE->getDecl());
7607 if (!var) return NCCK_None;
7608 if (var->getType().isConstQualified()) return NCCK_None;
7609 assert(var->hasLocalStorage() && "capture added 'const' to non-local?");
7610
7611 // Decide whether the first capture was for a block or a lambda.
7612 DeclContext *DC = S.CurContext;
7613 while (DC->getParent() != var->getDeclContext())
7614 DC = DC->getParent();
7615 return (isa<BlockDecl>(DC) ? NCCK_Block : NCCK_Lambda);
7616}
7617
Chris Lattner30bd3272008-11-18 01:22:49 +00007618/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not,
7619/// emit an error and return true. If so, return false.
7620static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) {
Fariborz Jahanianca5c5972012-04-10 17:30:10 +00007621 assert(!E->hasPlaceholderType(BuiltinType::PseudoObject));
Daniel Dunbarc2223ab2009-04-15 00:08:05 +00007622 SourceLocation OrigLoc = Loc;
Mike Stump11289f42009-09-09 15:08:12 +00007623 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context,
Daniel Dunbarc2223ab2009-04-15 00:08:05 +00007624 &Loc);
Fariborz Jahanian8e1555c2009-01-12 19:55:42 +00007625 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S))
7626 IsLV = Expr::MLV_ReadonlyProperty;
Fariborz Jahanian071caef2011-03-26 19:48:30 +00007627 else if (IsLV == Expr::MLV_ClassTemporary && IsReadonlyMessage(E, S))
7628 IsLV = Expr::MLV_InvalidMessageExpression;
Chris Lattner30bd3272008-11-18 01:22:49 +00007629 if (IsLV == Expr::MLV_Valid)
7630 return false;
Mike Stump4e1f26a2009-02-19 03:04:26 +00007631
Chris Lattner30bd3272008-11-18 01:22:49 +00007632 unsigned Diag = 0;
7633 bool NeedType = false;
7634 switch (IsLV) { // C99 6.5.16p2
John McCall31168b02011-06-15 23:02:42 +00007635 case Expr::MLV_ConstQualified:
7636 Diag = diag::err_typecheck_assign_const;
7637
John McCall5fa2ef42012-03-13 00:37:01 +00007638 // Use a specialized diagnostic when we're assigning to an object
7639 // from an enclosing function or block.
7640 if (NonConstCaptureKind NCCK = isReferenceToNonConstCapture(S, E)) {
7641 if (NCCK == NCCK_Block)
7642 Diag = diag::err_block_decl_ref_not_modifiable_lvalue;
7643 else
7644 Diag = diag::err_lambda_decl_ref_not_modifiable_lvalue;
7645 break;
7646 }
7647
John McCalld4631322011-06-17 06:42:21 +00007648 // In ARC, use some specialized diagnostics for occasions where we
7649 // infer 'const'. These are always pseudo-strong variables.
David Blaikiebbafb8a2012-03-11 07:00:24 +00007650 if (S.getLangOpts().ObjCAutoRefCount) {
John McCall31168b02011-06-15 23:02:42 +00007651 DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts());
7652 if (declRef && isa<VarDecl>(declRef->getDecl())) {
7653 VarDecl *var = cast<VarDecl>(declRef->getDecl());
7654
John McCalld4631322011-06-17 06:42:21 +00007655 // Use the normal diagnostic if it's pseudo-__strong but the
7656 // user actually wrote 'const'.
7657 if (var->isARCPseudoStrong() &&
7658 (!var->getTypeSourceInfo() ||
7659 !var->getTypeSourceInfo()->getType().isConstQualified())) {
7660 // There are two pseudo-strong cases:
7661 // - self
John McCall31168b02011-06-15 23:02:42 +00007662 ObjCMethodDecl *method = S.getCurMethodDecl();
7663 if (method && var == method->getSelfDecl())
Ted Kremenek1fcdaa92011-11-14 21:59:25 +00007664 Diag = method->isClassMethod()
7665 ? diag::err_typecheck_arc_assign_self_class_method
7666 : diag::err_typecheck_arc_assign_self;
John McCalld4631322011-06-17 06:42:21 +00007667
7668 // - fast enumeration variables
7669 else
John McCall31168b02011-06-15 23:02:42 +00007670 Diag = diag::err_typecheck_arr_assign_enumeration;
John McCalld4631322011-06-17 06:42:21 +00007671
John McCall31168b02011-06-15 23:02:42 +00007672 SourceRange Assign;
7673 if (Loc != OrigLoc)
7674 Assign = SourceRange(OrigLoc, OrigLoc);
7675 S.Diag(Loc, Diag) << E->getSourceRange() << Assign;
7676 // We need to preserve the AST regardless, so migration tool
7677 // can do its job.
7678 return false;
7679 }
7680 }
7681 }
7682
7683 break;
Mike Stump4e1f26a2009-02-19 03:04:26 +00007684 case Expr::MLV_ArrayType:
Richard Smitheb3cad52012-06-04 22:27:30 +00007685 case Expr::MLV_ArrayTemporary:
Chris Lattner30bd3272008-11-18 01:22:49 +00007686 Diag = diag::err_typecheck_array_not_modifiable_lvalue;
7687 NeedType = true;
7688 break;
Mike Stump4e1f26a2009-02-19 03:04:26 +00007689 case Expr::MLV_NotObjectType:
Chris Lattner30bd3272008-11-18 01:22:49 +00007690 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue;
7691 NeedType = true;
7692 break;
Chris Lattner9b3bbe92008-11-17 19:51:54 +00007693 case Expr::MLV_LValueCast:
Chris Lattner30bd3272008-11-18 01:22:49 +00007694 Diag = diag::err_typecheck_lvalue_casts_not_supported;
7695 break;
Douglas Gregorb154fdc2010-02-16 21:39:57 +00007696 case Expr::MLV_Valid:
7697 llvm_unreachable("did not take early return for MLV_Valid");
Chris Lattner9bad62c2008-01-04 18:04:52 +00007698 case Expr::MLV_InvalidExpression:
Douglas Gregorb154fdc2010-02-16 21:39:57 +00007699 case Expr::MLV_MemberFunction:
7700 case Expr::MLV_ClassTemporary:
Chris Lattner30bd3272008-11-18 01:22:49 +00007701 Diag = diag::err_typecheck_expression_not_modifiable_lvalue;
7702 break;
Chris Lattner9bad62c2008-01-04 18:04:52 +00007703 case Expr::MLV_IncompleteType:
7704 case Expr::MLV_IncompleteVoidType:
Douglas Gregored0cfbd2009-03-09 16:13:40 +00007705 return S.RequireCompleteType(Loc, E->getType(),
Douglas Gregor7bfb2d02012-05-04 16:32:21 +00007706 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, E);
Chris Lattner9bad62c2008-01-04 18:04:52 +00007707 case Expr::MLV_DuplicateVectorComponents:
Chris Lattner30bd3272008-11-18 01:22:49 +00007708 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue;
7709 break;
Fariborz Jahanian8a1810f2008-11-22 18:39:36 +00007710 case Expr::MLV_ReadonlyProperty:
Fariborz Jahanian5118c412008-11-22 20:25:50 +00007711 case Expr::MLV_NoSetterProperty:
John McCall526ab472011-10-25 17:37:35 +00007712 llvm_unreachable("readonly properties should be processed differently");
Fariborz Jahanian071caef2011-03-26 19:48:30 +00007713 case Expr::MLV_InvalidMessageExpression:
7714 Diag = diag::error_readonly_message_assignment;
7715 break;
Fariborz Jahaniane8d28902009-12-15 23:59:41 +00007716 case Expr::MLV_SubObjCPropertySetting:
7717 Diag = diag::error_no_subobject_property_setting;
7718 break;
Steve Naroff218bc2b2007-05-04 21:54:46 +00007719 }
Steve Naroffad373bd2007-07-31 12:34:36 +00007720
Daniel Dunbarc2223ab2009-04-15 00:08:05 +00007721 SourceRange Assign;
7722 if (Loc != OrigLoc)
7723 Assign = SourceRange(OrigLoc, OrigLoc);
Chris Lattner30bd3272008-11-18 01:22:49 +00007724 if (NeedType)
Daniel Dunbarc2223ab2009-04-15 00:08:05 +00007725 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign;
Chris Lattner30bd3272008-11-18 01:22:49 +00007726 else
Mike Stump11289f42009-09-09 15:08:12 +00007727 S.Diag(Loc, Diag) << E->getSourceRange() << Assign;
Chris Lattner30bd3272008-11-18 01:22:49 +00007728 return true;
7729}
7730
Nico Weberb8124d12012-07-03 02:03:06 +00007731static void CheckIdentityFieldAssignment(Expr *LHSExpr, Expr *RHSExpr,
7732 SourceLocation Loc,
7733 Sema &Sema) {
7734 // C / C++ fields
Nico Weber33fd5232012-06-28 23:53:12 +00007735 MemberExpr *ML = dyn_cast<MemberExpr>(LHSExpr);
7736 MemberExpr *MR = dyn_cast<MemberExpr>(RHSExpr);
7737 if (ML && MR && ML->getMemberDecl() == MR->getMemberDecl()) {
7738 if (isa<CXXThisExpr>(ML->getBase()) && isa<CXXThisExpr>(MR->getBase()))
Nico Weberb8124d12012-07-03 02:03:06 +00007739 Sema.Diag(Loc, diag::warn_identity_field_assign) << 0;
Nico Weber33fd5232012-06-28 23:53:12 +00007740 }
Chris Lattner30bd3272008-11-18 01:22:49 +00007741
Nico Weberb8124d12012-07-03 02:03:06 +00007742 // Objective-C instance variables
Nico Weber33fd5232012-06-28 23:53:12 +00007743 ObjCIvarRefExpr *OL = dyn_cast<ObjCIvarRefExpr>(LHSExpr);
7744 ObjCIvarRefExpr *OR = dyn_cast<ObjCIvarRefExpr>(RHSExpr);
7745 if (OL && OR && OL->getDecl() == OR->getDecl()) {
7746 DeclRefExpr *RL = dyn_cast<DeclRefExpr>(OL->getBase()->IgnoreImpCasts());
7747 DeclRefExpr *RR = dyn_cast<DeclRefExpr>(OR->getBase()->IgnoreImpCasts());
7748 if (RL && RR && RL->getDecl() == RR->getDecl())
Nico Weberb8124d12012-07-03 02:03:06 +00007749 Sema.Diag(Loc, diag::warn_identity_field_assign) << 1;
Nico Weber33fd5232012-06-28 23:53:12 +00007750 }
7751}
Chris Lattner30bd3272008-11-18 01:22:49 +00007752
7753// C99 6.5.16.1
Richard Trieuda4f43a62011-09-07 01:33:52 +00007754QualType Sema::CheckAssignmentOperands(Expr *LHSExpr, ExprResult &RHS,
Chris Lattner326f7572008-11-18 01:30:42 +00007755 SourceLocation Loc,
7756 QualType CompoundType) {
John McCall526ab472011-10-25 17:37:35 +00007757 assert(!LHSExpr->hasPlaceholderType(BuiltinType::PseudoObject));
7758
Chris Lattner326f7572008-11-18 01:30:42 +00007759 // Verify that LHS is a modifiable lvalue, and emit error if not.
Richard Trieuda4f43a62011-09-07 01:33:52 +00007760 if (CheckForModifiableLvalue(LHSExpr, Loc, *this))
Chris Lattner30bd3272008-11-18 01:22:49 +00007761 return QualType();
Chris Lattner326f7572008-11-18 01:30:42 +00007762
Richard Trieuda4f43a62011-09-07 01:33:52 +00007763 QualType LHSType = LHSExpr->getType();
Richard Trieucfc491d2011-08-02 04:35:43 +00007764 QualType RHSType = CompoundType.isNull() ? RHS.get()->getType() :
7765 CompoundType;
Chris Lattner9bad62c2008-01-04 18:04:52 +00007766 AssignConvertType ConvTy;
Chris Lattner326f7572008-11-18 01:30:42 +00007767 if (CompoundType.isNull()) {
Nico Weber33fd5232012-06-28 23:53:12 +00007768 Expr *RHSCheck = RHS.get();
7769
Nico Weberb8124d12012-07-03 02:03:06 +00007770 CheckIdentityFieldAssignment(LHSExpr, RHSCheck, Loc, *this);
Nico Weber33fd5232012-06-28 23:53:12 +00007771
Fariborz Jahanianbe21aa32010-06-07 22:02:01 +00007772 QualType LHSTy(LHSType);
Fariborz Jahanianbe21aa32010-06-07 22:02:01 +00007773 ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
John Wiegley01296292011-04-08 18:41:53 +00007774 if (RHS.isInvalid())
7775 return QualType();
Fariborz Jahanian255c0952009-01-13 23:34:40 +00007776 // Special case of NSObject attributes on c-style pointer types.
7777 if (ConvTy == IncompatiblePointer &&
7778 ((Context.isObjCNSObjectType(LHSType) &&
Steve Naroff79d12152009-07-16 15:41:00 +00007779 RHSType->isObjCObjectPointerType()) ||
Fariborz Jahanian255c0952009-01-13 23:34:40 +00007780 (Context.isObjCNSObjectType(RHSType) &&
Steve Naroff79d12152009-07-16 15:41:00 +00007781 LHSType->isObjCObjectPointerType())))
Fariborz Jahanian255c0952009-01-13 23:34:40 +00007782 ConvTy = Compatible;
Mike Stump4e1f26a2009-02-19 03:04:26 +00007783
John McCall7decc9e2010-11-18 06:31:45 +00007784 if (ConvTy == Compatible &&
Fariborz Jahaniane2a77762012-01-24 19:40:13 +00007785 LHSType->isObjCObjectType())
Fariborz Jahanian3c4225a2012-01-24 18:05:45 +00007786 Diag(Loc, diag::err_objc_object_assignment)
7787 << LHSType;
John McCall7decc9e2010-11-18 06:31:45 +00007788
Chris Lattnerea714382008-08-21 18:04:13 +00007789 // If the RHS is a unary plus or minus, check to see if they = and + are
7790 // right next to each other. If so, the user may have typo'd "x =+ 4"
7791 // instead of "x += 4".
Chris Lattnerea714382008-08-21 18:04:13 +00007792 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck))
7793 RHSCheck = ICE->getSubExpr();
7794 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) {
John McCalle3027922010-08-25 11:45:40 +00007795 if ((UO->getOpcode() == UO_Plus ||
7796 UO->getOpcode() == UO_Minus) &&
Chris Lattner326f7572008-11-18 01:30:42 +00007797 Loc.isFileID() && UO->getOperatorLoc().isFileID() &&
Chris Lattnerea714382008-08-21 18:04:13 +00007798 // Only if the two operators are exactly adjacent.
Argyrios Kyrtzidise6e67de2011-09-19 20:40:19 +00007799 Loc.getLocWithOffset(1) == UO->getOperatorLoc() &&
Chris Lattner36c39c92009-03-08 06:51:10 +00007800 // And there is a space or other character before the subexpr of the
7801 // unary +/-. We don't want to warn on "x=-1".
Argyrios Kyrtzidise6e67de2011-09-19 20:40:19 +00007802 Loc.getLocWithOffset(2) != UO->getSubExpr()->getLocStart() &&
Chris Lattnered9f14c2009-03-09 07:11:10 +00007803 UO->getSubExpr()->getLocStart().isFileID()) {
Chris Lattner29e812b2008-11-20 06:06:08 +00007804 Diag(Loc, diag::warn_not_compound_assign)
John McCalle3027922010-08-25 11:45:40 +00007805 << (UO->getOpcode() == UO_Plus ? "+" : "-")
Chris Lattner29e812b2008-11-20 06:06:08 +00007806 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc());
Chris Lattner36c39c92009-03-08 06:51:10 +00007807 }
Chris Lattnerea714382008-08-21 18:04:13 +00007808 }
John McCall31168b02011-06-15 23:02:42 +00007809
7810 if (ConvTy == Compatible) {
Jordan Rosefa9e4ba2012-09-15 02:48:31 +00007811 if (LHSType.getObjCLifetime() == Qualifiers::OCL_Strong) {
7812 // Warn about retain cycles where a block captures the LHS, but
7813 // not if the LHS is a simple variable into which the block is
7814 // being stored...unless that variable can be captured by reference!
7815 const Expr *InnerLHS = LHSExpr->IgnoreParenCasts();
7816 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(InnerLHS);
7817 if (!DRE || DRE->getDecl()->hasAttr<BlocksAttr>())
7818 checkRetainCycles(LHSExpr, RHS.get());
7819
Jordan Rosed3934582012-09-28 22:21:30 +00007820 // It is safe to assign a weak reference into a strong variable.
7821 // Although this code can still have problems:
7822 // id x = self.weakProp;
7823 // id y = self.weakProp;
7824 // we do not warn to warn spuriously when 'x' and 'y' are on separate
7825 // paths through the function. This should be revisited if
7826 // -Wrepeated-use-of-weak is made flow-sensitive.
7827 DiagnosticsEngine::Level Level =
7828 Diags.getDiagnosticLevel(diag::warn_arc_repeated_use_of_weak,
7829 RHS.get()->getLocStart());
7830 if (Level != DiagnosticsEngine::Ignored)
7831 getCurFunction()->markSafeWeakUse(RHS.get());
7832
Jordan Rosefa9e4ba2012-09-15 02:48:31 +00007833 } else if (getLangOpts().ObjCAutoRefCount) {
Richard Trieuda4f43a62011-09-07 01:33:52 +00007834 checkUnsafeExprAssigns(Loc, LHSExpr, RHS.get());
Jordan Rosefa9e4ba2012-09-15 02:48:31 +00007835 }
John McCall31168b02011-06-15 23:02:42 +00007836 }
Chris Lattnerea714382008-08-21 18:04:13 +00007837 } else {
7838 // Compound assignment "x += y"
Douglas Gregorc03a1082011-01-28 02:26:04 +00007839 ConvTy = CheckAssignmentConstraints(Loc, LHSType, RHSType);
Chris Lattnerea714382008-08-21 18:04:13 +00007840 }
Chris Lattner9bad62c2008-01-04 18:04:52 +00007841
Chris Lattner326f7572008-11-18 01:30:42 +00007842 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType,
John Wiegley01296292011-04-08 18:41:53 +00007843 RHS.get(), AA_Assigning))
Chris Lattner9bad62c2008-01-04 18:04:52 +00007844 return QualType();
Mike Stump4e1f26a2009-02-19 03:04:26 +00007845
Richard Trieuda4f43a62011-09-07 01:33:52 +00007846 CheckForNullPointerDereference(*this, LHSExpr);
Kaelyn Uhrain2e7aa5a2011-08-05 23:18:04 +00007847
Steve Naroff98cf3e92007-06-06 18:38:38 +00007848 // C99 6.5.16p3: The type of an assignment expression is the type of the
7849 // left operand unless the left operand has qualified type, in which case
Mike Stump4e1f26a2009-02-19 03:04:26 +00007850 // it is the unqualified version of the type of the left operand.
Steve Naroff98cf3e92007-06-06 18:38:38 +00007851 // C99 6.5.16.1p2: In simple assignment, the value of the right operand
7852 // is converted to the type of the assignment expression (above).
Chris Lattnerf17bd422007-08-30 17:45:32 +00007853 // C++ 5.17p1: the type of the assignment expression is that of its left
Douglas Gregord2c2d172009-05-02 00:36:19 +00007854 // operand.
David Blaikiebbafb8a2012-03-11 07:00:24 +00007855 return (getLangOpts().CPlusPlus
John McCall01cbf2d2010-10-12 02:19:57 +00007856 ? LHSType : LHSType.getUnqualifiedType());
Steve Naroffae4143e2007-04-26 20:39:23 +00007857}
7858
Chris Lattner326f7572008-11-18 01:30:42 +00007859// C99 6.5.17
John Wiegley01296292011-04-08 18:41:53 +00007860static QualType CheckCommaOperands(Sema &S, ExprResult &LHS, ExprResult &RHS,
John McCall4bc41ae2010-11-18 19:01:18 +00007861 SourceLocation Loc) {
John McCall3aef3d82011-04-10 19:13:55 +00007862 LHS = S.CheckPlaceholderExpr(LHS.take());
7863 RHS = S.CheckPlaceholderExpr(RHS.take());
John Wiegley01296292011-04-08 18:41:53 +00007864 if (LHS.isInvalid() || RHS.isInvalid())
Douglas Gregor0124e9b2010-11-09 21:07:58 +00007865 return QualType();
7866
John McCall73d36182010-10-12 07:14:40 +00007867 // C's comma performs lvalue conversion (C99 6.3.2.1) on both its
7868 // operands, but not unary promotions.
7869 // C++'s comma does not do any conversions at all (C++ [expr.comma]p1).
Eli Friedmanba961a92009-03-23 00:24:07 +00007870
John McCall34376a62010-12-04 03:47:34 +00007871 // So we treat the LHS as a ignored value, and in C++ we allow the
7872 // containing site to determine what should be done with the RHS.
John Wiegley01296292011-04-08 18:41:53 +00007873 LHS = S.IgnoredValueConversions(LHS.take());
7874 if (LHS.isInvalid())
7875 return QualType();
John McCall34376a62010-12-04 03:47:34 +00007876
Eli Friedmanc11535c2012-05-24 00:47:05 +00007877 S.DiagnoseUnusedExprResult(LHS.get());
7878
David Blaikiebbafb8a2012-03-11 07:00:24 +00007879 if (!S.getLangOpts().CPlusPlus) {
John Wiegley01296292011-04-08 18:41:53 +00007880 RHS = S.DefaultFunctionArrayLvalueConversion(RHS.take());
7881 if (RHS.isInvalid())
7882 return QualType();
7883 if (!RHS.get()->getType()->isVoidType())
Richard Trieucfc491d2011-08-02 04:35:43 +00007884 S.RequireCompleteType(Loc, RHS.get()->getType(),
7885 diag::err_incomplete_type);
John McCall73d36182010-10-12 07:14:40 +00007886 }
Eli Friedmanba961a92009-03-23 00:24:07 +00007887
John Wiegley01296292011-04-08 18:41:53 +00007888 return RHS.get()->getType();
Steve Naroff95af0132007-03-30 23:47:58 +00007889}
7890
Steve Naroff7a5af782007-07-13 16:58:59 +00007891/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine
7892/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions.
John McCall4bc41ae2010-11-18 19:01:18 +00007893static QualType CheckIncrementDecrementOperand(Sema &S, Expr *Op,
7894 ExprValueKind &VK,
7895 SourceLocation OpLoc,
Richard Trieuba63ce62011-09-09 01:45:06 +00007896 bool IsInc, bool IsPrefix) {
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00007897 if (Op->isTypeDependent())
John McCall4bc41ae2010-11-18 19:01:18 +00007898 return S.Context.DependentTy;
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00007899
Chris Lattner6b0cf142008-11-21 07:05:48 +00007900 QualType ResType = Op->getType();
David Chisnallfa35df62012-01-16 17:27:18 +00007901 // Atomic types can be used for increment / decrement where the non-atomic
7902 // versions can, so ignore the _Atomic() specifier for the purpose of
7903 // checking.
7904 if (const AtomicType *ResAtomicType = ResType->getAs<AtomicType>())
7905 ResType = ResAtomicType->getValueType();
7906
Chris Lattner6b0cf142008-11-21 07:05:48 +00007907 assert(!ResType.isNull() && "no type for increment/decrement expression");
Steve Naroffd50c88e2007-04-05 21:15:20 +00007908
David Blaikiebbafb8a2012-03-11 07:00:24 +00007909 if (S.getLangOpts().CPlusPlus && ResType->isBooleanType()) {
Sebastian Redle10c2c32008-12-20 09:35:34 +00007910 // Decrement of bool is not allowed.
Richard Trieuba63ce62011-09-09 01:45:06 +00007911 if (!IsInc) {
John McCall4bc41ae2010-11-18 19:01:18 +00007912 S.Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange();
Sebastian Redle10c2c32008-12-20 09:35:34 +00007913 return QualType();
7914 }
7915 // Increment of bool sets it to true, but is deprecated.
John McCall4bc41ae2010-11-18 19:01:18 +00007916 S.Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange();
Sebastian Redle10c2c32008-12-20 09:35:34 +00007917 } else if (ResType->isRealType()) {
Chris Lattner6b0cf142008-11-21 07:05:48 +00007918 // OK!
John McCallf2538342012-07-31 05:14:30 +00007919 } else if (ResType->isPointerType()) {
Chris Lattner6b0cf142008-11-21 07:05:48 +00007920 // C99 6.5.2.4p2, 6.5.6p2
Chandler Carruthc9332212011-06-27 08:02:19 +00007921 if (!checkArithmeticOpPointerOperand(S, OpLoc, Op))
Douglas Gregordd430f72009-01-19 19:26:10 +00007922 return QualType();
John McCallf2538342012-07-31 05:14:30 +00007923 } else if (ResType->isObjCObjectPointerType()) {
7924 // On modern runtimes, ObjC pointer arithmetic is forbidden.
7925 // Otherwise, we just need a complete type.
7926 if (checkArithmeticIncompletePointerType(S, OpLoc, Op) ||
7927 checkArithmeticOnObjCPointer(S, OpLoc, Op))
7928 return QualType();
Eli Friedman090addd2010-01-03 00:20:48 +00007929 } else if (ResType->isAnyComplexType()) {
Chris Lattner6b0cf142008-11-21 07:05:48 +00007930 // C99 does not support ++/-- on complex types, we allow as an extension.
John McCall4bc41ae2010-11-18 19:01:18 +00007931 S.Diag(OpLoc, diag::ext_integer_increment_complex)
Chris Lattner1e5665e2008-11-24 06:25:27 +00007932 << ResType << Op->getSourceRange();
John McCall36226622010-10-12 02:09:17 +00007933 } else if (ResType->isPlaceholderType()) {
John McCall3aef3d82011-04-10 19:13:55 +00007934 ExprResult PR = S.CheckPlaceholderExpr(Op);
John McCall36226622010-10-12 02:09:17 +00007935 if (PR.isInvalid()) return QualType();
John McCall4bc41ae2010-11-18 19:01:18 +00007936 return CheckIncrementDecrementOperand(S, PR.take(), VK, OpLoc,
Richard Trieuba63ce62011-09-09 01:45:06 +00007937 IsInc, IsPrefix);
David Blaikiebbafb8a2012-03-11 07:00:24 +00007938 } else if (S.getLangOpts().AltiVec && ResType->isVectorType()) {
Anton Yartsev85129b82011-02-07 02:17:30 +00007939 // OK! ( C/C++ Language Extensions for CBEA(Version 2.6) 10.3 )
Chris Lattner6b0cf142008-11-21 07:05:48 +00007940 } else {
John McCall4bc41ae2010-11-18 19:01:18 +00007941 S.Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement)
Richard Trieuba63ce62011-09-09 01:45:06 +00007942 << ResType << int(IsInc) << Op->getSourceRange();
Chris Lattner6b0cf142008-11-21 07:05:48 +00007943 return QualType();
Steve Naroff46ba1eb2007-04-03 23:13:13 +00007944 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00007945 // At this point, we know we have a real, complex or pointer type.
Steve Naroff9e1e5512007-08-23 21:37:33 +00007946 // Now make sure the operand is a modifiable lvalue.
John McCall4bc41ae2010-11-18 19:01:18 +00007947 if (CheckForModifiableLvalue(Op, OpLoc, S))
Steve Naroff35d85152007-05-07 00:24:15 +00007948 return QualType();
Alexis Huntc46382e2010-04-28 23:02:27 +00007949 // In C++, a prefix increment is the same type as the operand. Otherwise
7950 // (in C or with postfix), the increment is the unqualified type of the
7951 // operand.
David Blaikiebbafb8a2012-03-11 07:00:24 +00007952 if (IsPrefix && S.getLangOpts().CPlusPlus) {
John McCall4bc41ae2010-11-18 19:01:18 +00007953 VK = VK_LValue;
7954 return ResType;
7955 } else {
7956 VK = VK_RValue;
7957 return ResType.getUnqualifiedType();
7958 }
Steve Naroff26c8ea52007-03-21 21:08:52 +00007959}
Fariborz Jahanian805b74e2010-09-14 23:02:38 +00007960
7961
Anders Carlsson806700f2008-02-01 07:15:58 +00007962/// getPrimaryDecl - Helper function for CheckAddressOfOperand().
Steve Naroff47500512007-04-19 23:00:49 +00007963/// This routine allows us to typecheck complex/recursive expressions
Daniel Dunbarb692ef42008-08-04 20:02:37 +00007964/// where the declaration is needed for type checking. We only need to
7965/// handle cases when the expression references a function designator
7966/// or is an lvalue. Here are some examples:
7967/// - &(x) => x
7968/// - &*****f => f for f a function designator.
7969/// - &s.xx => s
7970/// - &s.zz[1].yy -> s, if zz is an array
7971/// - *(x + 1) -> x, if x is an array
7972/// - &"123"[2] -> 0
7973/// - & __real__ x -> x
John McCallf3a88602011-02-03 08:15:49 +00007974static ValueDecl *getPrimaryDecl(Expr *E) {
Chris Lattner24d5bfe2008-04-02 04:24:33 +00007975 switch (E->getStmtClass()) {
Steve Naroff47500512007-04-19 23:00:49 +00007976 case Stmt::DeclRefExprClass:
Chris Lattner24d5bfe2008-04-02 04:24:33 +00007977 return cast<DeclRefExpr>(E)->getDecl();
Steve Naroff47500512007-04-19 23:00:49 +00007978 case Stmt::MemberExprClass:
Eli Friedman3a1e6922009-04-20 08:23:18 +00007979 // If this is an arrow operator, the address is an offset from
7980 // the base's value, so the object the base refers to is
7981 // irrelevant.
Chris Lattner24d5bfe2008-04-02 04:24:33 +00007982 if (cast<MemberExpr>(E)->isArrow())
Chris Lattner48d52842007-11-16 17:46:48 +00007983 return 0;
Eli Friedman3a1e6922009-04-20 08:23:18 +00007984 // Otherwise, the expression refers to a part of the base
Chris Lattner24d5bfe2008-04-02 04:24:33 +00007985 return getPrimaryDecl(cast<MemberExpr>(E)->getBase());
Anders Carlsson806700f2008-02-01 07:15:58 +00007986 case Stmt::ArraySubscriptExprClass: {
Mike Stump87c57ac2009-05-16 07:39:55 +00007987 // FIXME: This code shouldn't be necessary! We should catch the implicit
7988 // promotion of register arrays earlier.
Eli Friedman3a1e6922009-04-20 08:23:18 +00007989 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase();
7990 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) {
7991 if (ICE->getSubExpr()->getType()->isArrayType())
7992 return getPrimaryDecl(ICE->getSubExpr());
7993 }
7994 return 0;
Anders Carlsson806700f2008-02-01 07:15:58 +00007995 }
Daniel Dunbarb692ef42008-08-04 20:02:37 +00007996 case Stmt::UnaryOperatorClass: {
7997 UnaryOperator *UO = cast<UnaryOperator>(E);
Mike Stump4e1f26a2009-02-19 03:04:26 +00007998
Daniel Dunbarb692ef42008-08-04 20:02:37 +00007999 switch(UO->getOpcode()) {
John McCalle3027922010-08-25 11:45:40 +00008000 case UO_Real:
8001 case UO_Imag:
8002 case UO_Extension:
Daniel Dunbarb692ef42008-08-04 20:02:37 +00008003 return getPrimaryDecl(UO->getSubExpr());
8004 default:
8005 return 0;
8006 }
8007 }
Steve Naroff47500512007-04-19 23:00:49 +00008008 case Stmt::ParenExprClass:
Chris Lattner24d5bfe2008-04-02 04:24:33 +00008009 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr());
Chris Lattner48d52842007-11-16 17:46:48 +00008010 case Stmt::ImplicitCastExprClass:
Eli Friedman3a1e6922009-04-20 08:23:18 +00008011 // If the result of an implicit cast is an l-value, we care about
8012 // the sub-expression; otherwise, the result here doesn't matter.
Chris Lattner24d5bfe2008-04-02 04:24:33 +00008013 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr());
Steve Naroff47500512007-04-19 23:00:49 +00008014 default:
8015 return 0;
8016 }
8017}
8018
Richard Trieu5f376f62011-09-07 21:46:33 +00008019namespace {
8020 enum {
8021 AO_Bit_Field = 0,
8022 AO_Vector_Element = 1,
8023 AO_Property_Expansion = 2,
8024 AO_Register_Variable = 3,
8025 AO_No_Error = 4
8026 };
8027}
Richard Trieu3fd7bb82011-09-02 00:47:55 +00008028/// \brief Diagnose invalid operand for address of operations.
8029///
8030/// \param Type The type of operand which cannot have its address taken.
Richard Trieu3fd7bb82011-09-02 00:47:55 +00008031static void diagnoseAddressOfInvalidType(Sema &S, SourceLocation Loc,
8032 Expr *E, unsigned Type) {
8033 S.Diag(Loc, diag::err_typecheck_address_of) << Type << E->getSourceRange();
8034}
8035
Steve Naroff47500512007-04-19 23:00:49 +00008036/// CheckAddressOfOperand - The operand of & must be either a function
Mike Stump4e1f26a2009-02-19 03:04:26 +00008037/// designator or an lvalue designating an object. If it is an lvalue, the
Steve Naroff47500512007-04-19 23:00:49 +00008038/// object cannot be declared with storage class register or be a bit field.
Mike Stump4e1f26a2009-02-19 03:04:26 +00008039/// Note: The usual conversions are *not* applied to the operand of the &
Steve Naroffa78fe7e2007-05-16 19:47:19 +00008040/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue.
Mike Stump4e1f26a2009-02-19 03:04:26 +00008041/// In C++, the operand might be an overloaded function name, in which case
Douglas Gregorcd695e52008-11-10 20:40:00 +00008042/// we allow the '&' but retain the overloaded-function type.
John McCall526ab472011-10-25 17:37:35 +00008043static QualType CheckAddressOfOperand(Sema &S, ExprResult &OrigOp,
John McCall4bc41ae2010-11-18 19:01:18 +00008044 SourceLocation OpLoc) {
John McCall526ab472011-10-25 17:37:35 +00008045 if (const BuiltinType *PTy = OrigOp.get()->getType()->getAsPlaceholderType()){
8046 if (PTy->getKind() == BuiltinType::Overload) {
8047 if (!isa<OverloadExpr>(OrigOp.get()->IgnoreParens())) {
Richard Smithc084bd282013-02-02 02:14:45 +00008048 assert(cast<UnaryOperator>(OrigOp.get()->IgnoreParens())->getOpcode()
8049 == UO_AddrOf);
8050 S.Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof_addrof_function)
John McCall526ab472011-10-25 17:37:35 +00008051 << OrigOp.get()->getSourceRange();
8052 return QualType();
8053 }
8054
8055 return S.Context.OverloadTy;
8056 }
8057
8058 if (PTy->getKind() == BuiltinType::UnknownAny)
8059 return S.Context.UnknownAnyTy;
8060
8061 if (PTy->getKind() == BuiltinType::BoundMember) {
8062 S.Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
8063 << OrigOp.get()->getSourceRange();
Douglas Gregor668d3622011-10-09 19:10:41 +00008064 return QualType();
8065 }
John McCall526ab472011-10-25 17:37:35 +00008066
8067 OrigOp = S.CheckPlaceholderExpr(OrigOp.take());
8068 if (OrigOp.isInvalid()) return QualType();
John McCall0009fcc2011-04-26 20:42:42 +00008069 }
John McCall8d08b9b2010-08-27 09:08:28 +00008070
John McCall526ab472011-10-25 17:37:35 +00008071 if (OrigOp.get()->isTypeDependent())
8072 return S.Context.DependentTy;
8073
8074 assert(!OrigOp.get()->getType()->isPlaceholderType());
John McCall36226622010-10-12 02:09:17 +00008075
John McCall8d08b9b2010-08-27 09:08:28 +00008076 // Make sure to ignore parentheses in subsequent checks
John McCall526ab472011-10-25 17:37:35 +00008077 Expr *op = OrigOp.get()->IgnoreParens();
Douglas Gregor19b8c4f2008-12-17 22:52:20 +00008078
David Blaikiebbafb8a2012-03-11 07:00:24 +00008079 if (S.getLangOpts().C99) {
Steve Naroff826e91a2008-01-13 17:10:08 +00008080 // Implement C99-only parts of addressof rules.
8081 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) {
John McCalle3027922010-08-25 11:45:40 +00008082 if (uOp->getOpcode() == UO_Deref)
Steve Naroff826e91a2008-01-13 17:10:08 +00008083 // Per C99 6.5.3.2, the address of a deref always returns a valid result
8084 // (assuming the deref expression is valid).
8085 return uOp->getSubExpr()->getType();
8086 }
8087 // Technically, there should be a check for array subscript
8088 // expressions here, but the result of one is always an lvalue anyway.
8089 }
John McCallf3a88602011-02-03 08:15:49 +00008090 ValueDecl *dcl = getPrimaryDecl(op);
John McCall086a4642010-11-24 05:12:34 +00008091 Expr::LValueClassification lval = op->ClassifyLValue(S.Context);
Richard Trieu5f376f62011-09-07 21:46:33 +00008092 unsigned AddressOfError = AO_No_Error;
Nuno Lopes17f345f2008-12-16 22:59:47 +00008093
Richard Smithc084bd282013-02-02 02:14:45 +00008094 if (lval == Expr::LV_ClassTemporary || lval == Expr::LV_ArrayTemporary) {
John McCall4bc41ae2010-11-18 19:01:18 +00008095 bool sfinae = S.isSFINAEContext();
Richard Smithc084bd282013-02-02 02:14:45 +00008096 S.Diag(OpLoc, sfinae ? diag::err_typecheck_addrof_temporary
8097 : diag::ext_typecheck_addrof_temporary)
Douglas Gregorb154fdc2010-02-16 21:39:57 +00008098 << op->getType() << op->getSourceRange();
John McCall4bc41ae2010-11-18 19:01:18 +00008099 if (sfinae)
Douglas Gregorb154fdc2010-02-16 21:39:57 +00008100 return QualType();
John McCall8d08b9b2010-08-27 09:08:28 +00008101 } else if (isa<ObjCSelectorExpr>(op)) {
John McCall4bc41ae2010-11-18 19:01:18 +00008102 return S.Context.getPointerType(op->getType());
John McCall8d08b9b2010-08-27 09:08:28 +00008103 } else if (lval == Expr::LV_MemberFunction) {
8104 // If it's an instance method, make a member pointer.
8105 // The expression must have exactly the form &A::foo.
8106
8107 // If the underlying expression isn't a decl ref, give up.
8108 if (!isa<DeclRefExpr>(op)) {
John McCall4bc41ae2010-11-18 19:01:18 +00008109 S.Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
John McCall526ab472011-10-25 17:37:35 +00008110 << OrigOp.get()->getSourceRange();
John McCall8d08b9b2010-08-27 09:08:28 +00008111 return QualType();
8112 }
8113 DeclRefExpr *DRE = cast<DeclRefExpr>(op);
8114 CXXMethodDecl *MD = cast<CXXMethodDecl>(DRE->getDecl());
8115
8116 // The id-expression was parenthesized.
John McCall526ab472011-10-25 17:37:35 +00008117 if (OrigOp.get() != DRE) {
John McCall4bc41ae2010-11-18 19:01:18 +00008118 S.Diag(OpLoc, diag::err_parens_pointer_member_function)
John McCall526ab472011-10-25 17:37:35 +00008119 << OrigOp.get()->getSourceRange();
John McCall8d08b9b2010-08-27 09:08:28 +00008120
8121 // The method was named without a qualifier.
8122 } else if (!DRE->getQualifier()) {
David Blaikiec2ff8e12012-10-11 22:55:07 +00008123 if (MD->getParent()->getName().empty())
8124 S.Diag(OpLoc, diag::err_unqualified_pointer_member_function)
8125 << op->getSourceRange();
8126 else {
8127 SmallString<32> Str;
8128 StringRef Qual = (MD->getParent()->getName() + "::").toStringRef(Str);
8129 S.Diag(OpLoc, diag::err_unqualified_pointer_member_function)
8130 << op->getSourceRange()
8131 << FixItHint::CreateInsertion(op->getSourceRange().getBegin(), Qual);
8132 }
John McCall8d08b9b2010-08-27 09:08:28 +00008133 }
8134
John McCall4bc41ae2010-11-18 19:01:18 +00008135 return S.Context.getMemberPointerType(op->getType(),
8136 S.Context.getTypeDeclType(MD->getParent()).getTypePtr());
John McCall8d08b9b2010-08-27 09:08:28 +00008137 } else if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) {
Eli Friedmance7f9002009-05-16 23:27:50 +00008138 // C99 6.5.3.2p1
Eli Friedman3a1e6922009-04-20 08:23:18 +00008139 // The operand must be either an l-value or a function designator
Eli Friedmance7f9002009-05-16 23:27:50 +00008140 if (!op->getType()->isFunctionType()) {
John McCall526ab472011-10-25 17:37:35 +00008141 // Use a special diagnostic for loads from property references.
John McCallfe96e0b2011-11-06 09:01:30 +00008142 if (isa<PseudoObjectExpr>(op)) {
John McCall526ab472011-10-25 17:37:35 +00008143 AddressOfError = AO_Property_Expansion;
8144 } else {
John McCall526ab472011-10-25 17:37:35 +00008145 S.Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof)
Richard Smithc084bd282013-02-02 02:14:45 +00008146 << op->getType() << op->getSourceRange();
John McCall526ab472011-10-25 17:37:35 +00008147 return QualType();
8148 }
Steve Naroff35d85152007-05-07 00:24:15 +00008149 }
John McCall086a4642010-11-24 05:12:34 +00008150 } else if (op->getObjectKind() == OK_BitField) { // C99 6.5.3.2p1
Eli Friedman3a1e6922009-04-20 08:23:18 +00008151 // The operand cannot be a bit-field
Richard Trieu5f376f62011-09-07 21:46:33 +00008152 AddressOfError = AO_Bit_Field;
John McCall086a4642010-11-24 05:12:34 +00008153 } else if (op->getObjectKind() == OK_VectorComponent) {
Eli Friedman3a1e6922009-04-20 08:23:18 +00008154 // The operand cannot be an element of a vector
Richard Trieu5f376f62011-09-07 21:46:33 +00008155 AddressOfError = AO_Vector_Element;
Steve Naroffb96e4ab62008-02-29 23:30:25 +00008156 } else if (dcl) { // C99 6.5.3.2p1
Mike Stump4e1f26a2009-02-19 03:04:26 +00008157 // We have an lvalue with a decl. Make sure the decl is not declared
Steve Naroff47500512007-04-19 23:00:49 +00008158 // with the register storage-class specifier.
8159 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) {
Fariborz Jahaniane0fd5a92010-08-24 22:21:48 +00008160 // in C++ it is not error to take address of a register
8161 // variable (c++03 7.1.1P3)
John McCall8e7d6562010-08-26 03:08:43 +00008162 if (vd->getStorageClass() == SC_Register &&
David Blaikiebbafb8a2012-03-11 07:00:24 +00008163 !S.getLangOpts().CPlusPlus) {
Richard Trieu5f376f62011-09-07 21:46:33 +00008164 AddressOfError = AO_Register_Variable;
Steve Naroff35d85152007-05-07 00:24:15 +00008165 }
John McCalld14a8642009-11-21 08:51:07 +00008166 } else if (isa<FunctionTemplateDecl>(dcl)) {
John McCall4bc41ae2010-11-18 19:01:18 +00008167 return S.Context.OverloadTy;
John McCallf3a88602011-02-03 08:15:49 +00008168 } else if (isa<FieldDecl>(dcl) || isa<IndirectFieldDecl>(dcl)) {
Douglas Gregor9aa8b552008-12-10 21:26:49 +00008169 // Okay: we can take the address of a field.
Sebastian Redl3d3f75a2009-02-03 20:19:35 +00008170 // Could be a pointer to member, though, if there is an explicit
8171 // scope qualifier for the class.
Douglas Gregor4bd90e52009-10-23 18:54:35 +00008172 if (isa<DeclRefExpr>(op) && cast<DeclRefExpr>(op)->getQualifier()) {
Sebastian Redl3d3f75a2009-02-03 20:19:35 +00008173 DeclContext *Ctx = dcl->getDeclContext();
Anders Carlsson0b675f52009-07-08 21:45:58 +00008174 if (Ctx && Ctx->isRecord()) {
John McCallf3a88602011-02-03 08:15:49 +00008175 if (dcl->getType()->isReferenceType()) {
John McCall4bc41ae2010-11-18 19:01:18 +00008176 S.Diag(OpLoc,
8177 diag::err_cannot_form_pointer_to_member_of_reference_type)
John McCallf3a88602011-02-03 08:15:49 +00008178 << dcl->getDeclName() << dcl->getType();
Anders Carlsson0b675f52009-07-08 21:45:58 +00008179 return QualType();
8180 }
Mike Stump11289f42009-09-09 15:08:12 +00008181
Argyrios Kyrtzidis8322b422011-01-31 07:04:29 +00008182 while (cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion())
8183 Ctx = Ctx->getParent();
John McCall4bc41ae2010-11-18 19:01:18 +00008184 return S.Context.getMemberPointerType(op->getType(),
8185 S.Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr());
Anders Carlsson0b675f52009-07-08 21:45:58 +00008186 }
Sebastian Redl3d3f75a2009-02-03 20:19:35 +00008187 }
Eli Friedman755c0c92011-08-26 20:28:17 +00008188 } else if (!isa<FunctionDecl>(dcl) && !isa<NonTypeTemplateParmDecl>(dcl))
David Blaikie83d382b2011-09-23 05:06:16 +00008189 llvm_unreachable("Unknown/unexpected decl type");
Steve Naroff47500512007-04-19 23:00:49 +00008190 }
Sebastian Redl18f8ff62009-02-04 21:23:32 +00008191
Richard Trieu5f376f62011-09-07 21:46:33 +00008192 if (AddressOfError != AO_No_Error) {
8193 diagnoseAddressOfInvalidType(S, OpLoc, op, AddressOfError);
8194 return QualType();
8195 }
8196
Eli Friedmance7f9002009-05-16 23:27:50 +00008197 if (lval == Expr::LV_IncompleteVoidType) {
8198 // Taking the address of a void variable is technically illegal, but we
8199 // allow it in cases which are otherwise valid.
8200 // Example: "extern void x; void* y = &x;".
John McCall4bc41ae2010-11-18 19:01:18 +00008201 S.Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange();
Eli Friedmance7f9002009-05-16 23:27:50 +00008202 }
8203
Steve Naroff47500512007-04-19 23:00:49 +00008204 // If the operand has type "type", the result has type "pointer to type".
Douglas Gregor0bdcb8a2010-07-29 16:05:45 +00008205 if (op->getType()->isObjCObjectType())
John McCall4bc41ae2010-11-18 19:01:18 +00008206 return S.Context.getObjCObjectPointerType(op->getType());
8207 return S.Context.getPointerType(op->getType());
Steve Naroff47500512007-04-19 23:00:49 +00008208}
8209
Chris Lattner9156f1b2010-07-05 19:17:26 +00008210/// CheckIndirectionOperand - Type check unary indirection (prefix '*').
John McCall4bc41ae2010-11-18 19:01:18 +00008211static QualType CheckIndirectionOperand(Sema &S, Expr *Op, ExprValueKind &VK,
8212 SourceLocation OpLoc) {
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00008213 if (Op->isTypeDependent())
John McCall4bc41ae2010-11-18 19:01:18 +00008214 return S.Context.DependentTy;
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00008215
John Wiegley01296292011-04-08 18:41:53 +00008216 ExprResult ConvResult = S.UsualUnaryConversions(Op);
8217 if (ConvResult.isInvalid())
8218 return QualType();
8219 Op = ConvResult.take();
Chris Lattner9156f1b2010-07-05 19:17:26 +00008220 QualType OpTy = Op->getType();
8221 QualType Result;
Argyrios Kyrtzidis69a2c922011-05-02 18:21:19 +00008222
8223 if (isa<CXXReinterpretCastExpr>(Op)) {
8224 QualType OpOrigType = Op->IgnoreParenCasts()->getType();
8225 S.CheckCompatibleReinterpretCast(OpOrigType, OpTy, /*IsDereference*/true,
8226 Op->getSourceRange());
8227 }
8228
Chris Lattner9156f1b2010-07-05 19:17:26 +00008229 // Note that per both C89 and C99, indirection is always legal, even if OpTy
8230 // is an incomplete type or void. It would be possible to warn about
8231 // dereferencing a void pointer, but it's completely well-defined, and such a
8232 // warning is unlikely to catch any mistakes.
8233 if (const PointerType *PT = OpTy->getAs<PointerType>())
8234 Result = PT->getPointeeType();
8235 else if (const ObjCObjectPointerType *OPT =
8236 OpTy->getAs<ObjCObjectPointerType>())
8237 Result = OPT->getPointeeType();
John McCall36226622010-10-12 02:09:17 +00008238 else {
John McCall3aef3d82011-04-10 19:13:55 +00008239 ExprResult PR = S.CheckPlaceholderExpr(Op);
John McCall36226622010-10-12 02:09:17 +00008240 if (PR.isInvalid()) return QualType();
John McCall4bc41ae2010-11-18 19:01:18 +00008241 if (PR.take() != Op)
8242 return CheckIndirectionOperand(S, PR.take(), VK, OpLoc);
John McCall36226622010-10-12 02:09:17 +00008243 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00008244
Chris Lattner9156f1b2010-07-05 19:17:26 +00008245 if (Result.isNull()) {
John McCall4bc41ae2010-11-18 19:01:18 +00008246 S.Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer)
Chris Lattner9156f1b2010-07-05 19:17:26 +00008247 << OpTy << Op->getSourceRange();
8248 return QualType();
8249 }
John McCall4bc41ae2010-11-18 19:01:18 +00008250
8251 // Dereferences are usually l-values...
8252 VK = VK_LValue;
8253
8254 // ...except that certain expressions are never l-values in C.
David Blaikiebbafb8a2012-03-11 07:00:24 +00008255 if (!S.getLangOpts().CPlusPlus && Result.isCForbiddenLValueType())
John McCall4bc41ae2010-11-18 19:01:18 +00008256 VK = VK_RValue;
Chris Lattner9156f1b2010-07-05 19:17:26 +00008257
8258 return Result;
Steve Naroff1926c832007-04-24 00:23:05 +00008259}
Steve Naroff218bc2b2007-05-04 21:54:46 +00008260
John McCalle3027922010-08-25 11:45:40 +00008261static inline BinaryOperatorKind ConvertTokenKindToBinaryOpcode(
Steve Naroff218bc2b2007-05-04 21:54:46 +00008262 tok::TokenKind Kind) {
John McCalle3027922010-08-25 11:45:40 +00008263 BinaryOperatorKind Opc;
Steve Naroff218bc2b2007-05-04 21:54:46 +00008264 switch (Kind) {
David Blaikie83d382b2011-09-23 05:06:16 +00008265 default: llvm_unreachable("Unknown binop!");
John McCalle3027922010-08-25 11:45:40 +00008266 case tok::periodstar: Opc = BO_PtrMemD; break;
8267 case tok::arrowstar: Opc = BO_PtrMemI; break;
8268 case tok::star: Opc = BO_Mul; break;
8269 case tok::slash: Opc = BO_Div; break;
8270 case tok::percent: Opc = BO_Rem; break;
8271 case tok::plus: Opc = BO_Add; break;
8272 case tok::minus: Opc = BO_Sub; break;
8273 case tok::lessless: Opc = BO_Shl; break;
8274 case tok::greatergreater: Opc = BO_Shr; break;
8275 case tok::lessequal: Opc = BO_LE; break;
8276 case tok::less: Opc = BO_LT; break;
8277 case tok::greaterequal: Opc = BO_GE; break;
8278 case tok::greater: Opc = BO_GT; break;
8279 case tok::exclaimequal: Opc = BO_NE; break;
8280 case tok::equalequal: Opc = BO_EQ; break;
8281 case tok::amp: Opc = BO_And; break;
8282 case tok::caret: Opc = BO_Xor; break;
8283 case tok::pipe: Opc = BO_Or; break;
8284 case tok::ampamp: Opc = BO_LAnd; break;
8285 case tok::pipepipe: Opc = BO_LOr; break;
8286 case tok::equal: Opc = BO_Assign; break;
8287 case tok::starequal: Opc = BO_MulAssign; break;
8288 case tok::slashequal: Opc = BO_DivAssign; break;
8289 case tok::percentequal: Opc = BO_RemAssign; break;
8290 case tok::plusequal: Opc = BO_AddAssign; break;
8291 case tok::minusequal: Opc = BO_SubAssign; break;
8292 case tok::lesslessequal: Opc = BO_ShlAssign; break;
8293 case tok::greatergreaterequal: Opc = BO_ShrAssign; break;
8294 case tok::ampequal: Opc = BO_AndAssign; break;
8295 case tok::caretequal: Opc = BO_XorAssign; break;
8296 case tok::pipeequal: Opc = BO_OrAssign; break;
8297 case tok::comma: Opc = BO_Comma; break;
Steve Naroff218bc2b2007-05-04 21:54:46 +00008298 }
8299 return Opc;
8300}
8301
John McCalle3027922010-08-25 11:45:40 +00008302static inline UnaryOperatorKind ConvertTokenKindToUnaryOpcode(
Steve Naroff35d85152007-05-07 00:24:15 +00008303 tok::TokenKind Kind) {
John McCalle3027922010-08-25 11:45:40 +00008304 UnaryOperatorKind Opc;
Steve Naroff35d85152007-05-07 00:24:15 +00008305 switch (Kind) {
David Blaikie83d382b2011-09-23 05:06:16 +00008306 default: llvm_unreachable("Unknown unary op!");
John McCalle3027922010-08-25 11:45:40 +00008307 case tok::plusplus: Opc = UO_PreInc; break;
8308 case tok::minusminus: Opc = UO_PreDec; break;
8309 case tok::amp: Opc = UO_AddrOf; break;
8310 case tok::star: Opc = UO_Deref; break;
8311 case tok::plus: Opc = UO_Plus; break;
8312 case tok::minus: Opc = UO_Minus; break;
8313 case tok::tilde: Opc = UO_Not; break;
8314 case tok::exclaim: Opc = UO_LNot; break;
8315 case tok::kw___real: Opc = UO_Real; break;
8316 case tok::kw___imag: Opc = UO_Imag; break;
8317 case tok::kw___extension__: Opc = UO_Extension; break;
Steve Naroff35d85152007-05-07 00:24:15 +00008318 }
8319 return Opc;
8320}
8321
Chandler Carruthe0cee6a2011-01-04 06:52:15 +00008322/// DiagnoseSelfAssignment - Emits a warning if a value is assigned to itself.
8323/// This warning is only emitted for builtin assignment operations. It is also
8324/// suppressed in the event of macro expansions.
Richard Trieuda4f43a62011-09-07 01:33:52 +00008325static void DiagnoseSelfAssignment(Sema &S, Expr *LHSExpr, Expr *RHSExpr,
Chandler Carruthe0cee6a2011-01-04 06:52:15 +00008326 SourceLocation OpLoc) {
8327 if (!S.ActiveTemplateInstantiations.empty())
8328 return;
8329 if (OpLoc.isInvalid() || OpLoc.isMacroID())
8330 return;
Richard Trieuda4f43a62011-09-07 01:33:52 +00008331 LHSExpr = LHSExpr->IgnoreParenImpCasts();
8332 RHSExpr = RHSExpr->IgnoreParenImpCasts();
8333 const DeclRefExpr *LHSDeclRef = dyn_cast<DeclRefExpr>(LHSExpr);
8334 const DeclRefExpr *RHSDeclRef = dyn_cast<DeclRefExpr>(RHSExpr);
8335 if (!LHSDeclRef || !RHSDeclRef ||
8336 LHSDeclRef->getLocation().isMacroID() ||
8337 RHSDeclRef->getLocation().isMacroID())
Chandler Carruthe0cee6a2011-01-04 06:52:15 +00008338 return;
Richard Trieuda4f43a62011-09-07 01:33:52 +00008339 const ValueDecl *LHSDecl =
8340 cast<ValueDecl>(LHSDeclRef->getDecl()->getCanonicalDecl());
8341 const ValueDecl *RHSDecl =
8342 cast<ValueDecl>(RHSDeclRef->getDecl()->getCanonicalDecl());
8343 if (LHSDecl != RHSDecl)
Chandler Carruthe0cee6a2011-01-04 06:52:15 +00008344 return;
Richard Trieuda4f43a62011-09-07 01:33:52 +00008345 if (LHSDecl->getType().isVolatileQualified())
Chandler Carruthe0cee6a2011-01-04 06:52:15 +00008346 return;
Richard Trieuda4f43a62011-09-07 01:33:52 +00008347 if (const ReferenceType *RefTy = LHSDecl->getType()->getAs<ReferenceType>())
Chandler Carruthe0cee6a2011-01-04 06:52:15 +00008348 if (RefTy->getPointeeType().isVolatileQualified())
8349 return;
8350
8351 S.Diag(OpLoc, diag::warn_self_assignment)
Richard Trieuda4f43a62011-09-07 01:33:52 +00008352 << LHSDeclRef->getType()
8353 << LHSExpr->getSourceRange() << RHSExpr->getSourceRange();
Chandler Carruthe0cee6a2011-01-04 06:52:15 +00008354}
8355
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008356/// CreateBuiltinBinOp - Creates a new built-in binary operation with
8357/// operator @p Opc at location @c TokLoc. This routine only supports
8358/// built-in operations; ActOnBinOp handles overloaded operators.
John McCalldadc5752010-08-24 06:29:42 +00008359ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc,
Argyrios Kyrtzidis7a808c02011-01-05 20:09:36 +00008360 BinaryOperatorKind Opc,
Richard Trieu4a287fb2011-09-07 01:49:20 +00008361 Expr *LHSExpr, Expr *RHSExpr) {
Richard Smith2bf7fdb2013-01-02 11:42:31 +00008362 if (getLangOpts().CPlusPlus11 && isa<InitListExpr>(RHSExpr)) {
Sebastian Redl67766732012-02-27 20:34:02 +00008363 // The syntax only allows initializer lists on the RHS of assignment,
8364 // so we don't need to worry about accepting invalid code for
8365 // non-assignment operators.
8366 // C++11 5.17p9:
8367 // The meaning of x = {v} [...] is that of x = T(v) [...]. The meaning
8368 // of x = {} is x = T().
8369 InitializationKind Kind =
8370 InitializationKind::CreateDirectList(RHSExpr->getLocStart());
8371 InitializedEntity Entity =
8372 InitializedEntity::InitializeTemporary(LHSExpr->getType());
8373 InitializationSequence InitSeq(*this, Entity, Kind, &RHSExpr, 1);
Benjamin Kramercc4c49d2012-08-23 23:38:35 +00008374 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, RHSExpr);
Sebastian Redl67766732012-02-27 20:34:02 +00008375 if (Init.isInvalid())
8376 return Init;
8377 RHSExpr = Init.take();
8378 }
8379
Richard Trieu4a287fb2011-09-07 01:49:20 +00008380 ExprResult LHS = Owned(LHSExpr), RHS = Owned(RHSExpr);
Eli Friedman8b7b1b12009-03-28 01:22:36 +00008381 QualType ResultTy; // Result type of the binary operator.
Eli Friedman8b7b1b12009-03-28 01:22:36 +00008382 // The following two variables are used for compound assignment operators
8383 QualType CompLHSTy; // Type of LHS after promotions for computation
8384 QualType CompResultTy; // Type of computation result
John McCall7decc9e2010-11-18 06:31:45 +00008385 ExprValueKind VK = VK_RValue;
8386 ExprObjectKind OK = OK_Ordinary;
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008387
8388 switch (Opc) {
John McCalle3027922010-08-25 11:45:40 +00008389 case BO_Assign:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008390 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, QualType());
David Blaikiebbafb8a2012-03-11 07:00:24 +00008391 if (getLangOpts().CPlusPlus &&
Richard Trieu4a287fb2011-09-07 01:49:20 +00008392 LHS.get()->getObjectKind() != OK_ObjCProperty) {
8393 VK = LHS.get()->getValueKind();
8394 OK = LHS.get()->getObjectKind();
John McCall7decc9e2010-11-18 06:31:45 +00008395 }
Chandler Carruthe0cee6a2011-01-04 06:52:15 +00008396 if (!ResultTy.isNull())
Richard Trieu4a287fb2011-09-07 01:49:20 +00008397 DiagnoseSelfAssignment(*this, LHS.get(), RHS.get(), OpLoc);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008398 break;
John McCalle3027922010-08-25 11:45:40 +00008399 case BO_PtrMemD:
8400 case BO_PtrMemI:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008401 ResultTy = CheckPointerToMemberOperands(LHS, RHS, VK, OpLoc,
John McCalle3027922010-08-25 11:45:40 +00008402 Opc == BO_PtrMemI);
Sebastian Redl112a97662009-02-07 00:15:38 +00008403 break;
John McCalle3027922010-08-25 11:45:40 +00008404 case BO_Mul:
8405 case BO_Div:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008406 ResultTy = CheckMultiplyDivideOperands(LHS, RHS, OpLoc, false,
John McCalle3027922010-08-25 11:45:40 +00008407 Opc == BO_Div);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008408 break;
John McCalle3027922010-08-25 11:45:40 +00008409 case BO_Rem:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008410 ResultTy = CheckRemainderOperands(LHS, RHS, OpLoc);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008411 break;
John McCalle3027922010-08-25 11:45:40 +00008412 case BO_Add:
Nico Weberccec40d2012-03-02 22:01:22 +00008413 ResultTy = CheckAdditionOperands(LHS, RHS, OpLoc, Opc);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008414 break;
John McCalle3027922010-08-25 11:45:40 +00008415 case BO_Sub:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008416 ResultTy = CheckSubtractionOperands(LHS, RHS, OpLoc);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008417 break;
John McCalle3027922010-08-25 11:45:40 +00008418 case BO_Shl:
8419 case BO_Shr:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008420 ResultTy = CheckShiftOperands(LHS, RHS, OpLoc, Opc);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008421 break;
John McCalle3027922010-08-25 11:45:40 +00008422 case BO_LE:
8423 case BO_LT:
8424 case BO_GE:
8425 case BO_GT:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008426 ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc, true);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008427 break;
John McCalle3027922010-08-25 11:45:40 +00008428 case BO_EQ:
8429 case BO_NE:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008430 ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc, false);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008431 break;
John McCalle3027922010-08-25 11:45:40 +00008432 case BO_And:
8433 case BO_Xor:
8434 case BO_Or:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008435 ResultTy = CheckBitwiseOperands(LHS, RHS, OpLoc);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008436 break;
John McCalle3027922010-08-25 11:45:40 +00008437 case BO_LAnd:
8438 case BO_LOr:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008439 ResultTy = CheckLogicalOperands(LHS, RHS, OpLoc, Opc);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008440 break;
John McCalle3027922010-08-25 11:45:40 +00008441 case BO_MulAssign:
8442 case BO_DivAssign:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008443 CompResultTy = CheckMultiplyDivideOperands(LHS, RHS, OpLoc, true,
John McCall7decc9e2010-11-18 06:31:45 +00008444 Opc == BO_DivAssign);
Eli Friedman8b7b1b12009-03-28 01:22:36 +00008445 CompLHSTy = CompResultTy;
Richard Trieu4a287fb2011-09-07 01:49:20 +00008446 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
8447 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008448 break;
John McCalle3027922010-08-25 11:45:40 +00008449 case BO_RemAssign:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008450 CompResultTy = CheckRemainderOperands(LHS, RHS, OpLoc, true);
Eli Friedman8b7b1b12009-03-28 01:22:36 +00008451 CompLHSTy = CompResultTy;
Richard Trieu4a287fb2011-09-07 01:49:20 +00008452 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
8453 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008454 break;
John McCalle3027922010-08-25 11:45:40 +00008455 case BO_AddAssign:
Nico Weberccec40d2012-03-02 22:01:22 +00008456 CompResultTy = CheckAdditionOperands(LHS, RHS, OpLoc, Opc, &CompLHSTy);
Richard Trieu4a287fb2011-09-07 01:49:20 +00008457 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
8458 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008459 break;
John McCalle3027922010-08-25 11:45:40 +00008460 case BO_SubAssign:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008461 CompResultTy = CheckSubtractionOperands(LHS, RHS, OpLoc, &CompLHSTy);
8462 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
8463 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008464 break;
John McCalle3027922010-08-25 11:45:40 +00008465 case BO_ShlAssign:
8466 case BO_ShrAssign:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008467 CompResultTy = CheckShiftOperands(LHS, RHS, OpLoc, Opc, true);
Eli Friedman8b7b1b12009-03-28 01:22:36 +00008468 CompLHSTy = CompResultTy;
Richard Trieu4a287fb2011-09-07 01:49:20 +00008469 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
8470 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008471 break;
John McCalle3027922010-08-25 11:45:40 +00008472 case BO_AndAssign:
8473 case BO_XorAssign:
8474 case BO_OrAssign:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008475 CompResultTy = CheckBitwiseOperands(LHS, RHS, OpLoc, true);
Eli Friedman8b7b1b12009-03-28 01:22:36 +00008476 CompLHSTy = CompResultTy;
Richard Trieu4a287fb2011-09-07 01:49:20 +00008477 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
8478 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008479 break;
John McCalle3027922010-08-25 11:45:40 +00008480 case BO_Comma:
Richard Trieu4a287fb2011-09-07 01:49:20 +00008481 ResultTy = CheckCommaOperands(*this, LHS, RHS, OpLoc);
David Blaikiebbafb8a2012-03-11 07:00:24 +00008482 if (getLangOpts().CPlusPlus && !RHS.isInvalid()) {
Richard Trieu4a287fb2011-09-07 01:49:20 +00008483 VK = RHS.get()->getValueKind();
8484 OK = RHS.get()->getObjectKind();
John McCall7decc9e2010-11-18 06:31:45 +00008485 }
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008486 break;
8487 }
Richard Trieu4a287fb2011-09-07 01:49:20 +00008488 if (ResultTy.isNull() || LHS.isInvalid() || RHS.isInvalid())
Sebastian Redlb5d49352009-01-19 22:31:54 +00008489 return ExprError();
Kaelyn Uhrain2e7aa5a2011-08-05 23:18:04 +00008490
8491 // Check for array bounds violations for both sides of the BinaryOperator
Richard Trieu4a287fb2011-09-07 01:49:20 +00008492 CheckArrayAccess(LHS.get());
8493 CheckArrayAccess(RHS.get());
Kaelyn Uhrain2e7aa5a2011-08-05 23:18:04 +00008494
Eli Friedman8b7b1b12009-03-28 01:22:36 +00008495 if (CompResultTy.isNull())
Richard Trieu4a287fb2011-09-07 01:49:20 +00008496 return Owned(new (Context) BinaryOperator(LHS.take(), RHS.take(), Opc,
Lang Hames5de91cc2012-10-02 04:45:10 +00008497 ResultTy, VK, OK, OpLoc,
8498 FPFeatures.fp_contract));
David Blaikiebbafb8a2012-03-11 07:00:24 +00008499 if (getLangOpts().CPlusPlus && LHS.get()->getObjectKind() !=
Richard Trieucfc491d2011-08-02 04:35:43 +00008500 OK_ObjCProperty) {
John McCall7decc9e2010-11-18 06:31:45 +00008501 VK = VK_LValue;
Richard Trieu4a287fb2011-09-07 01:49:20 +00008502 OK = LHS.get()->getObjectKind();
John McCall7decc9e2010-11-18 06:31:45 +00008503 }
Richard Trieu4a287fb2011-09-07 01:49:20 +00008504 return Owned(new (Context) CompoundAssignOperator(LHS.take(), RHS.take(), Opc,
John Wiegley01296292011-04-08 18:41:53 +00008505 ResultTy, VK, OK, CompLHSTy,
Lang Hames5de91cc2012-10-02 04:45:10 +00008506 CompResultTy, OpLoc,
8507 FPFeatures.fp_contract));
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008508}
8509
Sebastian Redl44615072009-10-27 12:10:02 +00008510/// DiagnoseBitwisePrecedence - Emit a warning when bitwise and comparison
8511/// operators are mixed in a way that suggests that the programmer forgot that
8512/// comparison operators have higher precedence. The most typical example of
8513/// such code is "flags & 0x0020 != 0", which is equivalent to "flags & 1".
John McCalle3027922010-08-25 11:45:40 +00008514static void DiagnoseBitwisePrecedence(Sema &Self, BinaryOperatorKind Opc,
Richard Trieu4a287fb2011-09-07 01:49:20 +00008515 SourceLocation OpLoc, Expr *LHSExpr,
8516 Expr *RHSExpr) {
Eli Friedman37feb2d2012-11-15 00:29:07 +00008517 BinaryOperator *LHSBO = dyn_cast<BinaryOperator>(LHSExpr);
8518 BinaryOperator *RHSBO = dyn_cast<BinaryOperator>(RHSExpr);
Sebastian Redl43028242009-10-26 15:24:15 +00008519
Eli Friedman37feb2d2012-11-15 00:29:07 +00008520 // Check that one of the sides is a comparison operator.
8521 bool isLeftComp = LHSBO && LHSBO->isComparisonOp();
8522 bool isRightComp = RHSBO && RHSBO->isComparisonOp();
8523 if (!isLeftComp && !isRightComp)
Sebastian Redl43028242009-10-26 15:24:15 +00008524 return;
8525
8526 // Bitwise operations are sometimes used as eager logical ops.
8527 // Don't diagnose this.
Eli Friedman37feb2d2012-11-15 00:29:07 +00008528 bool isLeftBitwise = LHSBO && LHSBO->isBitwiseOp();
8529 bool isRightBitwise = RHSBO && RHSBO->isBitwiseOp();
8530 if ((isLeftComp || isLeftBitwise) && (isRightComp || isRightBitwise))
Sebastian Redl43028242009-10-26 15:24:15 +00008531 return;
8532
Richard Trieu4a287fb2011-09-07 01:49:20 +00008533 SourceRange DiagRange = isLeftComp ? SourceRange(LHSExpr->getLocStart(),
8534 OpLoc)
8535 : SourceRange(OpLoc, RHSExpr->getLocEnd());
Eli Friedman37feb2d2012-11-15 00:29:07 +00008536 StringRef OpStr = isLeftComp ? LHSBO->getOpcodeStr() : RHSBO->getOpcodeStr();
Richard Trieu73088052011-08-10 22:41:34 +00008537 SourceRange ParensRange = isLeftComp ?
Eli Friedman37feb2d2012-11-15 00:29:07 +00008538 SourceRange(LHSBO->getRHS()->getLocStart(), RHSExpr->getLocEnd())
8539 : SourceRange(LHSExpr->getLocStart(), RHSBO->getLHS()->getLocStart());
Richard Trieu73088052011-08-10 22:41:34 +00008540
8541 Self.Diag(OpLoc, diag::warn_precedence_bitwise_rel)
Eli Friedman37feb2d2012-11-15 00:29:07 +00008542 << DiagRange << BinaryOperator::getOpcodeStr(Opc) << OpStr;
Richard Trieu73088052011-08-10 22:41:34 +00008543 SuggestParentheses(Self, OpLoc,
David Blaikiedac86fd2012-10-08 01:19:49 +00008544 Self.PDiag(diag::note_precedence_silence) << OpStr,
Nico Webercdfb1ae2012-06-03 07:07:00 +00008545 (isLeftComp ? LHSExpr : RHSExpr)->getSourceRange());
Richard Trieu73088052011-08-10 22:41:34 +00008546 SuggestParentheses(Self, OpLoc,
Eli Friedman37feb2d2012-11-15 00:29:07 +00008547 Self.PDiag(diag::note_precedence_bitwise_first)
8548 << BinaryOperator::getOpcodeStr(Opc),
Richard Trieu73088052011-08-10 22:41:34 +00008549 ParensRange);
Sebastian Redl43028242009-10-26 15:24:15 +00008550}
8551
Argyrios Kyrtzidis01bf7772011-06-20 18:41:26 +00008552/// \brief It accepts a '&' expr that is inside a '|' one.
8553/// Emit a diagnostic together with a fixit hint that wraps the '&' expression
8554/// in parentheses.
8555static void
8556EmitDiagnosticForBitwiseAndInBitwiseOr(Sema &Self, SourceLocation OpLoc,
8557 BinaryOperator *Bop) {
8558 assert(Bop->getOpcode() == BO_And);
8559 Self.Diag(Bop->getOperatorLoc(), diag::warn_bitwise_and_in_bitwise_or)
8560 << Bop->getSourceRange() << OpLoc;
8561 SuggestParentheses(Self, Bop->getOperatorLoc(),
David Blaikiedac86fd2012-10-08 01:19:49 +00008562 Self.PDiag(diag::note_precedence_silence)
8563 << Bop->getOpcodeStr(),
Argyrios Kyrtzidis01bf7772011-06-20 18:41:26 +00008564 Bop->getSourceRange());
8565}
8566
Argyrios Kyrtzidis14a96622010-11-17 18:26:36 +00008567/// \brief It accepts a '&&' expr that is inside a '||' one.
8568/// Emit a diagnostic together with a fixit hint that wraps the '&&' expression
8569/// in parentheses.
8570static void
8571EmitDiagnosticForLogicalAndInLogicalOr(Sema &Self, SourceLocation OpLoc,
Argyrios Kyrtzidisad8b4d42011-04-22 19:16:27 +00008572 BinaryOperator *Bop) {
8573 assert(Bop->getOpcode() == BO_LAnd);
Chandler Carruthb00e8c02011-06-16 01:05:14 +00008574 Self.Diag(Bop->getOperatorLoc(), diag::warn_logical_and_in_logical_or)
8575 << Bop->getSourceRange() << OpLoc;
Argyrios Kyrtzidisad8b4d42011-04-22 19:16:27 +00008576 SuggestParentheses(Self, Bop->getOperatorLoc(),
David Blaikiedac86fd2012-10-08 01:19:49 +00008577 Self.PDiag(diag::note_precedence_silence)
8578 << Bop->getOpcodeStr(),
Chandler Carruthb00e8c02011-06-16 01:05:14 +00008579 Bop->getSourceRange());
Argyrios Kyrtzidis14a96622010-11-17 18:26:36 +00008580}
8581
8582/// \brief Returns true if the given expression can be evaluated as a constant
8583/// 'true'.
8584static bool EvaluatesAsTrue(Sema &S, Expr *E) {
8585 bool Res;
8586 return E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && Res;
8587}
8588
Argyrios Kyrtzidis56e879d2010-11-17 19:18:19 +00008589/// \brief Returns true if the given expression can be evaluated as a constant
8590/// 'false'.
8591static bool EvaluatesAsFalse(Sema &S, Expr *E) {
8592 bool Res;
8593 return E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && !Res;
8594}
8595
Argyrios Kyrtzidis14a96622010-11-17 18:26:36 +00008596/// \brief Look for '&&' in the left hand of a '||' expr.
8597static void DiagnoseLogicalAndInLogicalOrLHS(Sema &S, SourceLocation OpLoc,
Richard Trieuf9bd0f52011-09-07 02:02:10 +00008598 Expr *LHSExpr, Expr *RHSExpr) {
8599 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(LHSExpr)) {
Argyrios Kyrtzidisf89a56c2010-11-16 21:00:12 +00008600 if (Bop->getOpcode() == BO_LAnd) {
Argyrios Kyrtzidis56e879d2010-11-17 19:18:19 +00008601 // If it's "a && b || 0" don't warn since the precedence doesn't matter.
Richard Trieuf9bd0f52011-09-07 02:02:10 +00008602 if (EvaluatesAsFalse(S, RHSExpr))
Argyrios Kyrtzidis56e879d2010-11-17 19:18:19 +00008603 return;
Argyrios Kyrtzidis14a96622010-11-17 18:26:36 +00008604 // If it's "1 && a || b" don't warn since the precedence doesn't matter.
8605 if (!EvaluatesAsTrue(S, Bop->getLHS()))
8606 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
8607 } else if (Bop->getOpcode() == BO_LOr) {
8608 if (BinaryOperator *RBop = dyn_cast<BinaryOperator>(Bop->getRHS())) {
8609 // If it's "a || b && 1 || c" we didn't warn earlier for
8610 // "a || b && 1", but warn now.
8611 if (RBop->getOpcode() == BO_LAnd && EvaluatesAsTrue(S, RBop->getRHS()))
8612 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, RBop);
8613 }
8614 }
8615 }
8616}
8617
8618/// \brief Look for '&&' in the right hand of a '||' expr.
8619static void DiagnoseLogicalAndInLogicalOrRHS(Sema &S, SourceLocation OpLoc,
Richard Trieuf9bd0f52011-09-07 02:02:10 +00008620 Expr *LHSExpr, Expr *RHSExpr) {
8621 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(RHSExpr)) {
Argyrios Kyrtzidis14a96622010-11-17 18:26:36 +00008622 if (Bop->getOpcode() == BO_LAnd) {
Argyrios Kyrtzidis56e879d2010-11-17 19:18:19 +00008623 // If it's "0 || a && b" don't warn since the precedence doesn't matter.
Richard Trieuf9bd0f52011-09-07 02:02:10 +00008624 if (EvaluatesAsFalse(S, LHSExpr))
Argyrios Kyrtzidis56e879d2010-11-17 19:18:19 +00008625 return;
Argyrios Kyrtzidis14a96622010-11-17 18:26:36 +00008626 // If it's "a || b && 1" don't warn since the precedence doesn't matter.
8627 if (!EvaluatesAsTrue(S, Bop->getRHS()))
8628 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
Argyrios Kyrtzidisf89a56c2010-11-16 21:00:12 +00008629 }
8630 }
8631}
8632
Argyrios Kyrtzidis01bf7772011-06-20 18:41:26 +00008633/// \brief Look for '&' in the left or right hand of a '|' expr.
8634static void DiagnoseBitwiseAndInBitwiseOr(Sema &S, SourceLocation OpLoc,
8635 Expr *OrArg) {
8636 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(OrArg)) {
8637 if (Bop->getOpcode() == BO_And)
8638 return EmitDiagnosticForBitwiseAndInBitwiseOr(S, OpLoc, Bop);
8639 }
8640}
8641
David Blaikie15f17cb2012-10-05 00:41:03 +00008642static void DiagnoseAdditionInShift(Sema &S, SourceLocation OpLoc,
David Blaikie82d3ab92012-10-19 18:26:06 +00008643 Expr *SubExpr, StringRef Shift) {
David Blaikie15f17cb2012-10-05 00:41:03 +00008644 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(SubExpr)) {
8645 if (Bop->getOpcode() == BO_Add || Bop->getOpcode() == BO_Sub) {
David Blaikiedac86fd2012-10-08 01:19:49 +00008646 StringRef Op = Bop->getOpcodeStr();
David Blaikie15f17cb2012-10-05 00:41:03 +00008647 S.Diag(Bop->getOperatorLoc(), diag::warn_addition_in_bitshift)
David Blaikie82d3ab92012-10-19 18:26:06 +00008648 << Bop->getSourceRange() << OpLoc << Shift << Op;
David Blaikie15f17cb2012-10-05 00:41:03 +00008649 SuggestParentheses(S, Bop->getOperatorLoc(),
David Blaikiedac86fd2012-10-08 01:19:49 +00008650 S.PDiag(diag::note_precedence_silence) << Op,
David Blaikie15f17cb2012-10-05 00:41:03 +00008651 Bop->getSourceRange());
8652 }
8653 }
8654}
8655
Sebastian Redl43028242009-10-26 15:24:15 +00008656/// DiagnoseBinOpPrecedence - Emit warnings for expressions with tricky
Argyrios Kyrtzidisf89a56c2010-11-16 21:00:12 +00008657/// precedence.
John McCalle3027922010-08-25 11:45:40 +00008658static void DiagnoseBinOpPrecedence(Sema &Self, BinaryOperatorKind Opc,
Richard Trieuf9bd0f52011-09-07 02:02:10 +00008659 SourceLocation OpLoc, Expr *LHSExpr,
8660 Expr *RHSExpr){
Argyrios Kyrtzidisf89a56c2010-11-16 21:00:12 +00008661 // Diagnose "arg1 'bitwise' arg2 'eq' arg3".
Sebastian Redl44615072009-10-27 12:10:02 +00008662 if (BinaryOperator::isBitwiseOp(Opc))
Richard Trieuf9bd0f52011-09-07 02:02:10 +00008663 DiagnoseBitwisePrecedence(Self, Opc, OpLoc, LHSExpr, RHSExpr);
Argyrios Kyrtzidis01bf7772011-06-20 18:41:26 +00008664
8665 // Diagnose "arg1 & arg2 | arg3"
8666 if (Opc == BO_Or && !OpLoc.isMacroID()/* Don't warn in macros. */) {
Richard Trieuf9bd0f52011-09-07 02:02:10 +00008667 DiagnoseBitwiseAndInBitwiseOr(Self, OpLoc, LHSExpr);
8668 DiagnoseBitwiseAndInBitwiseOr(Self, OpLoc, RHSExpr);
Argyrios Kyrtzidis01bf7772011-06-20 18:41:26 +00008669 }
Argyrios Kyrtzidisf89a56c2010-11-16 21:00:12 +00008670
Argyrios Kyrtzidis14a96622010-11-17 18:26:36 +00008671 // Warn about arg1 || arg2 && arg3, as GCC 4.3+ does.
8672 // We don't warn for 'assert(a || b && "bad")' since this is safe.
Argyrios Kyrtzidisb94e5a32010-11-17 18:54:22 +00008673 if (Opc == BO_LOr && !OpLoc.isMacroID()/* Don't warn in macros. */) {
Richard Trieuf9bd0f52011-09-07 02:02:10 +00008674 DiagnoseLogicalAndInLogicalOrLHS(Self, OpLoc, LHSExpr, RHSExpr);
8675 DiagnoseLogicalAndInLogicalOrRHS(Self, OpLoc, LHSExpr, RHSExpr);
Argyrios Kyrtzidisf89a56c2010-11-16 21:00:12 +00008676 }
David Blaikie15f17cb2012-10-05 00:41:03 +00008677
8678 if ((Opc == BO_Shl && LHSExpr->getType()->isIntegralType(Self.getASTContext()))
8679 || Opc == BO_Shr) {
David Blaikie82d3ab92012-10-19 18:26:06 +00008680 StringRef Shift = BinaryOperator::getOpcodeStr(Opc);
8681 DiagnoseAdditionInShift(Self, OpLoc, LHSExpr, Shift);
8682 DiagnoseAdditionInShift(Self, OpLoc, RHSExpr, Shift);
David Blaikie15f17cb2012-10-05 00:41:03 +00008683 }
Sebastian Redl43028242009-10-26 15:24:15 +00008684}
8685
Steve Naroff218bc2b2007-05-04 21:54:46 +00008686// Binary Operators. 'Tok' is the token for the operator.
John McCalldadc5752010-08-24 06:29:42 +00008687ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc,
John McCalle3027922010-08-25 11:45:40 +00008688 tok::TokenKind Kind,
Richard Trieuf9bd0f52011-09-07 02:02:10 +00008689 Expr *LHSExpr, Expr *RHSExpr) {
John McCalle3027922010-08-25 11:45:40 +00008690 BinaryOperatorKind Opc = ConvertTokenKindToBinaryOpcode(Kind);
Richard Trieuf9bd0f52011-09-07 02:02:10 +00008691 assert((LHSExpr != 0) && "ActOnBinOp(): missing left expression");
8692 assert((RHSExpr != 0) && "ActOnBinOp(): missing right expression");
Steve Naroff218bc2b2007-05-04 21:54:46 +00008693
Sebastian Redl43028242009-10-26 15:24:15 +00008694 // Emit warnings for tricky precedence issues, e.g. "bitfield & 0x4 == 0"
Richard Trieuf9bd0f52011-09-07 02:02:10 +00008695 DiagnoseBinOpPrecedence(*this, Opc, TokLoc, LHSExpr, RHSExpr);
Sebastian Redl43028242009-10-26 15:24:15 +00008696
Richard Trieuf9bd0f52011-09-07 02:02:10 +00008697 return BuildBinOp(S, TokLoc, Opc, LHSExpr, RHSExpr);
Douglas Gregor5287f092009-11-05 00:51:44 +00008698}
8699
John McCall526ab472011-10-25 17:37:35 +00008700/// Build an overloaded binary operator expression in the given scope.
8701static ExprResult BuildOverloadedBinOp(Sema &S, Scope *Sc, SourceLocation OpLoc,
8702 BinaryOperatorKind Opc,
8703 Expr *LHS, Expr *RHS) {
8704 // Find all of the overloaded operators visible from this
8705 // point. We perform both an operator-name lookup from the local
8706 // scope and an argument-dependent lookup based on the types of
8707 // the arguments.
8708 UnresolvedSet<16> Functions;
8709 OverloadedOperatorKind OverOp
8710 = BinaryOperator::getOverloadedOperator(Opc);
8711 if (Sc && OverOp != OO_None)
8712 S.LookupOverloadedOperatorName(OverOp, Sc, LHS->getType(),
8713 RHS->getType(), Functions);
8714
8715 // Build the (potentially-overloaded, potentially-dependent)
8716 // binary operation.
8717 return S.CreateOverloadedBinOp(OpLoc, Opc, Functions, LHS, RHS);
8718}
8719
John McCalldadc5752010-08-24 06:29:42 +00008720ExprResult Sema::BuildBinOp(Scope *S, SourceLocation OpLoc,
John McCalle3027922010-08-25 11:45:40 +00008721 BinaryOperatorKind Opc,
Richard Trieuf9bd0f52011-09-07 02:02:10 +00008722 Expr *LHSExpr, Expr *RHSExpr) {
John McCall9a43e122011-10-28 01:04:34 +00008723 // We want to end up calling one of checkPseudoObjectAssignment
8724 // (if the LHS is a pseudo-object), BuildOverloadedBinOp (if
8725 // both expressions are overloadable or either is type-dependent),
8726 // or CreateBuiltinBinOp (in any other case). We also want to get
8727 // any placeholder types out of the way.
8728
John McCall526ab472011-10-25 17:37:35 +00008729 // Handle pseudo-objects in the LHS.
8730 if (const BuiltinType *pty = LHSExpr->getType()->getAsPlaceholderType()) {
8731 // Assignments with a pseudo-object l-value need special analysis.
8732 if (pty->getKind() == BuiltinType::PseudoObject &&
8733 BinaryOperator::isAssignmentOp(Opc))
8734 return checkPseudoObjectAssignment(S, OpLoc, Opc, LHSExpr, RHSExpr);
8735
8736 // Don't resolve overloads if the other type is overloadable.
8737 if (pty->getKind() == BuiltinType::Overload) {
8738 // We can't actually test that if we still have a placeholder,
8739 // though. Fortunately, none of the exceptions we see in that
John McCall9a43e122011-10-28 01:04:34 +00008740 // code below are valid when the LHS is an overload set. Note
8741 // that an overload set can be dependently-typed, but it never
8742 // instantiates to having an overloadable type.
John McCall526ab472011-10-25 17:37:35 +00008743 ExprResult resolvedRHS = CheckPlaceholderExpr(RHSExpr);
8744 if (resolvedRHS.isInvalid()) return ExprError();
8745 RHSExpr = resolvedRHS.take();
8746
John McCall9a43e122011-10-28 01:04:34 +00008747 if (RHSExpr->isTypeDependent() ||
8748 RHSExpr->getType()->isOverloadableType())
John McCall526ab472011-10-25 17:37:35 +00008749 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
8750 }
8751
8752 ExprResult LHS = CheckPlaceholderExpr(LHSExpr);
8753 if (LHS.isInvalid()) return ExprError();
8754 LHSExpr = LHS.take();
8755 }
8756
8757 // Handle pseudo-objects in the RHS.
8758 if (const BuiltinType *pty = RHSExpr->getType()->getAsPlaceholderType()) {
8759 // An overload in the RHS can potentially be resolved by the type
8760 // being assigned to.
John McCall9a43e122011-10-28 01:04:34 +00008761 if (Opc == BO_Assign && pty->getKind() == BuiltinType::Overload) {
8762 if (LHSExpr->isTypeDependent() || RHSExpr->isTypeDependent())
8763 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
8764
Eli Friedman419b1ff2012-01-17 21:27:43 +00008765 if (LHSExpr->getType()->isOverloadableType())
8766 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
8767
John McCall526ab472011-10-25 17:37:35 +00008768 return CreateBuiltinBinOp(OpLoc, Opc, LHSExpr, RHSExpr);
John McCall9a43e122011-10-28 01:04:34 +00008769 }
John McCall526ab472011-10-25 17:37:35 +00008770
8771 // Don't resolve overloads if the other type is overloadable.
8772 if (pty->getKind() == BuiltinType::Overload &&
8773 LHSExpr->getType()->isOverloadableType())
8774 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
8775
8776 ExprResult resolvedRHS = CheckPlaceholderExpr(RHSExpr);
8777 if (!resolvedRHS.isUsable()) return ExprError();
8778 RHSExpr = resolvedRHS.take();
8779 }
8780
David Blaikiebbafb8a2012-03-11 07:00:24 +00008781 if (getLangOpts().CPlusPlus) {
John McCall9a43e122011-10-28 01:04:34 +00008782 // If either expression is type-dependent, always build an
8783 // overloaded op.
8784 if (LHSExpr->isTypeDependent() || RHSExpr->isTypeDependent())
8785 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00008786
John McCall9a43e122011-10-28 01:04:34 +00008787 // Otherwise, build an overloaded op if either expression has an
8788 // overloadable type.
8789 if (LHSExpr->getType()->isOverloadableType() ||
8790 RHSExpr->getType()->isOverloadableType())
John McCall526ab472011-10-25 17:37:35 +00008791 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
Sebastian Redlb5d49352009-01-19 22:31:54 +00008792 }
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00008793
Douglas Gregor7d5fc7e2008-11-06 23:29:22 +00008794 // Build a built-in binary operation.
Richard Trieuf9bd0f52011-09-07 02:02:10 +00008795 return CreateBuiltinBinOp(OpLoc, Opc, LHSExpr, RHSExpr);
Steve Naroff218bc2b2007-05-04 21:54:46 +00008796}
8797
John McCalldadc5752010-08-24 06:29:42 +00008798ExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
Argyrios Kyrtzidis7a808c02011-01-05 20:09:36 +00008799 UnaryOperatorKind Opc,
John Wiegley01296292011-04-08 18:41:53 +00008800 Expr *InputExpr) {
8801 ExprResult Input = Owned(InputExpr);
John McCall7decc9e2010-11-18 06:31:45 +00008802 ExprValueKind VK = VK_RValue;
8803 ExprObjectKind OK = OK_Ordinary;
Steve Naroff35d85152007-05-07 00:24:15 +00008804 QualType resultType;
8805 switch (Opc) {
John McCalle3027922010-08-25 11:45:40 +00008806 case UO_PreInc:
8807 case UO_PreDec:
8808 case UO_PostInc:
8809 case UO_PostDec:
John Wiegley01296292011-04-08 18:41:53 +00008810 resultType = CheckIncrementDecrementOperand(*this, Input.get(), VK, OpLoc,
John McCalle3027922010-08-25 11:45:40 +00008811 Opc == UO_PreInc ||
8812 Opc == UO_PostInc,
8813 Opc == UO_PreInc ||
8814 Opc == UO_PreDec);
Steve Naroff35d85152007-05-07 00:24:15 +00008815 break;
John McCalle3027922010-08-25 11:45:40 +00008816 case UO_AddrOf:
John McCall526ab472011-10-25 17:37:35 +00008817 resultType = CheckAddressOfOperand(*this, Input, OpLoc);
Steve Naroff35d85152007-05-07 00:24:15 +00008818 break;
John McCall31996342011-04-07 08:22:57 +00008819 case UO_Deref: {
John Wiegley01296292011-04-08 18:41:53 +00008820 Input = DefaultFunctionArrayLvalueConversion(Input.take());
Eli Friedman34866c72012-08-31 00:14:07 +00008821 if (Input.isInvalid()) return ExprError();
John Wiegley01296292011-04-08 18:41:53 +00008822 resultType = CheckIndirectionOperand(*this, Input.get(), VK, OpLoc);
Steve Naroff35d85152007-05-07 00:24:15 +00008823 break;
John McCall31996342011-04-07 08:22:57 +00008824 }
John McCalle3027922010-08-25 11:45:40 +00008825 case UO_Plus:
8826 case UO_Minus:
John Wiegley01296292011-04-08 18:41:53 +00008827 Input = UsualUnaryConversions(Input.take());
8828 if (Input.isInvalid()) return ExprError();
8829 resultType = Input.get()->getType();
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00008830 if (resultType->isDependentType())
8831 break;
Douglas Gregora3208f92010-06-22 23:41:02 +00008832 if (resultType->isArithmeticType() || // C99 6.5.3.3p1
8833 resultType->isVectorType())
Douglas Gregord08452f2008-11-19 15:42:04 +00008834 break;
David Blaikiebbafb8a2012-03-11 07:00:24 +00008835 else if (getLangOpts().CPlusPlus && // C++ [expr.unary.op]p6-7
Douglas Gregord08452f2008-11-19 15:42:04 +00008836 resultType->isEnumeralType())
8837 break;
David Blaikiebbafb8a2012-03-11 07:00:24 +00008838 else if (getLangOpts().CPlusPlus && // C++ [expr.unary.op]p6
John McCalle3027922010-08-25 11:45:40 +00008839 Opc == UO_Plus &&
Douglas Gregord08452f2008-11-19 15:42:04 +00008840 resultType->isPointerType())
8841 break;
8842
Sebastian Redlc215cfc2009-01-19 00:08:26 +00008843 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley01296292011-04-08 18:41:53 +00008844 << resultType << Input.get()->getSourceRange());
8845
John McCalle3027922010-08-25 11:45:40 +00008846 case UO_Not: // bitwise complement
John Wiegley01296292011-04-08 18:41:53 +00008847 Input = UsualUnaryConversions(Input.take());
8848 if (Input.isInvalid()) return ExprError();
8849 resultType = Input.get()->getType();
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00008850 if (resultType->isDependentType())
8851 break;
Chris Lattner0d707612008-07-25 23:52:49 +00008852 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension.
8853 if (resultType->isComplexType() || resultType->isComplexIntegerType())
8854 // C99 does not support '~' for complex conjugation.
Chris Lattner29e812b2008-11-20 06:06:08 +00008855 Diag(OpLoc, diag::ext_integer_complement_complex)
John Wiegley01296292011-04-08 18:41:53 +00008856 << resultType << Input.get()->getSourceRange();
John McCall36226622010-10-12 02:09:17 +00008857 else if (resultType->hasIntegerRepresentation())
8858 break;
John McCall526ab472011-10-25 17:37:35 +00008859 else {
Sebastian Redlc215cfc2009-01-19 00:08:26 +00008860 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley01296292011-04-08 18:41:53 +00008861 << resultType << Input.get()->getSourceRange());
John McCall36226622010-10-12 02:09:17 +00008862 }
Steve Naroff35d85152007-05-07 00:24:15 +00008863 break;
John Wiegley01296292011-04-08 18:41:53 +00008864
John McCalle3027922010-08-25 11:45:40 +00008865 case UO_LNot: // logical negation
Steve Naroff71b59a92007-06-04 22:22:31 +00008866 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5).
John Wiegley01296292011-04-08 18:41:53 +00008867 Input = DefaultFunctionArrayLvalueConversion(Input.take());
8868 if (Input.isInvalid()) return ExprError();
8869 resultType = Input.get()->getType();
Anton Korobeynikovf0c267e2011-10-14 23:23:15 +00008870
8871 // Though we still have to promote half FP to float...
Joey Goulydd7f4562013-01-23 11:56:20 +00008872 if (resultType->isHalfType() && !Context.getLangOpts().NativeHalfType) {
Anton Korobeynikovf0c267e2011-10-14 23:23:15 +00008873 Input = ImpCastExprToType(Input.take(), Context.FloatTy, CK_FloatingCast).take();
8874 resultType = Context.FloatTy;
8875 }
8876
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00008877 if (resultType->isDependentType())
8878 break;
Abramo Bagnara7ccce982011-04-07 09:26:19 +00008879 if (resultType->isScalarType()) {
8880 // C99 6.5.3.3p1: ok, fallthrough;
David Blaikiebbafb8a2012-03-11 07:00:24 +00008881 if (Context.getLangOpts().CPlusPlus) {
Abramo Bagnara7ccce982011-04-07 09:26:19 +00008882 // C++03 [expr.unary.op]p8, C++0x [expr.unary.op]p9:
8883 // operand contextually converted to bool.
John Wiegley01296292011-04-08 18:41:53 +00008884 Input = ImpCastExprToType(Input.take(), Context.BoolTy,
8885 ScalarTypeToBooleanCastKind(resultType));
Abramo Bagnara7ccce982011-04-07 09:26:19 +00008886 }
Tanya Lattner3dd33b22012-01-19 01:16:16 +00008887 } else if (resultType->isExtVectorType()) {
Tanya Lattner20248222012-01-16 21:02:28 +00008888 // Vector logical not returns the signed variant of the operand type.
8889 resultType = GetSignedVectorType(resultType);
8890 break;
John McCall36226622010-10-12 02:09:17 +00008891 } else {
Sebastian Redlc215cfc2009-01-19 00:08:26 +00008892 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley01296292011-04-08 18:41:53 +00008893 << resultType << Input.get()->getSourceRange());
John McCall36226622010-10-12 02:09:17 +00008894 }
Douglas Gregordb8c6fd2010-09-20 17:13:33 +00008895
Chris Lattnerbe31ed82007-06-02 19:11:33 +00008896 // LNot always has type int. C99 6.5.3.3p5.
Sebastian Redlc215cfc2009-01-19 00:08:26 +00008897 // In C++, it's bool. C++ 5.3.1p8
Argyrios Kyrtzidis1bdd6882011-02-18 20:55:15 +00008898 resultType = Context.getLogicalOperationType();
Steve Naroff35d85152007-05-07 00:24:15 +00008899 break;
John McCalle3027922010-08-25 11:45:40 +00008900 case UO_Real:
8901 case UO_Imag:
John McCall4bc41ae2010-11-18 19:01:18 +00008902 resultType = CheckRealImagOperand(*this, Input, OpLoc, Opc == UO_Real);
Richard Smith0b6b8e42012-02-18 20:53:32 +00008903 // _Real maps ordinary l-values into ordinary l-values. _Imag maps ordinary
8904 // complex l-values to ordinary l-values and all other values to r-values.
John Wiegley01296292011-04-08 18:41:53 +00008905 if (Input.isInvalid()) return ExprError();
Richard Smith0b6b8e42012-02-18 20:53:32 +00008906 if (Opc == UO_Real || Input.get()->getType()->isAnyComplexType()) {
8907 if (Input.get()->getValueKind() != VK_RValue &&
8908 Input.get()->getObjectKind() == OK_Ordinary)
8909 VK = Input.get()->getValueKind();
David Blaikiebbafb8a2012-03-11 07:00:24 +00008910 } else if (!getLangOpts().CPlusPlus) {
Richard Smith0b6b8e42012-02-18 20:53:32 +00008911 // In C, a volatile scalar is read by __imag. In C++, it is not.
8912 Input = DefaultLvalueConversion(Input.take());
8913 }
Chris Lattner30b5dd02007-08-24 21:16:53 +00008914 break;
John McCalle3027922010-08-25 11:45:40 +00008915 case UO_Extension:
John Wiegley01296292011-04-08 18:41:53 +00008916 resultType = Input.get()->getType();
8917 VK = Input.get()->getValueKind();
8918 OK = Input.get()->getObjectKind();
Steve Naroff043d45d2007-05-15 02:32:35 +00008919 break;
Steve Naroff35d85152007-05-07 00:24:15 +00008920 }
John Wiegley01296292011-04-08 18:41:53 +00008921 if (resultType.isNull() || Input.isInvalid())
Sebastian Redlc215cfc2009-01-19 00:08:26 +00008922 return ExprError();
Douglas Gregor084d8552009-03-13 23:49:33 +00008923
Kaelyn Uhrain2e7aa5a2011-08-05 23:18:04 +00008924 // Check for array bounds violations in the operand of the UnaryOperator,
8925 // except for the '*' and '&' operators that have to be handled specially
8926 // by CheckArrayAccess (as there are special cases like &array[arraysize]
8927 // that are explicitly defined as valid by the standard).
8928 if (Opc != UO_AddrOf && Opc != UO_Deref)
8929 CheckArrayAccess(Input.get());
8930
John Wiegley01296292011-04-08 18:41:53 +00008931 return Owned(new (Context) UnaryOperator(Input.take(), Opc, resultType,
John McCall7decc9e2010-11-18 06:31:45 +00008932 VK, OK, OpLoc));
Steve Naroff35d85152007-05-07 00:24:15 +00008933}
Chris Lattnereefa10e2007-05-28 06:56:27 +00008934
Douglas Gregor72341032011-12-14 21:23:13 +00008935/// \brief Determine whether the given expression is a qualified member
8936/// access expression, of a form that could be turned into a pointer to member
8937/// with the address-of operator.
8938static bool isQualifiedMemberAccess(Expr *E) {
8939 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
8940 if (!DRE->getQualifier())
8941 return false;
8942
8943 ValueDecl *VD = DRE->getDecl();
8944 if (!VD->isCXXClassMember())
8945 return false;
8946
8947 if (isa<FieldDecl>(VD) || isa<IndirectFieldDecl>(VD))
8948 return true;
8949 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(VD))
8950 return Method->isInstance();
8951
8952 return false;
8953 }
8954
8955 if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(E)) {
8956 if (!ULE->getQualifier())
8957 return false;
8958
8959 for (UnresolvedLookupExpr::decls_iterator D = ULE->decls_begin(),
8960 DEnd = ULE->decls_end();
8961 D != DEnd; ++D) {
8962 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(*D)) {
8963 if (Method->isInstance())
8964 return true;
8965 } else {
8966 // Overload set does not contain methods.
8967 break;
8968 }
8969 }
8970
8971 return false;
8972 }
8973
8974 return false;
8975}
8976
John McCalldadc5752010-08-24 06:29:42 +00008977ExprResult Sema::BuildUnaryOp(Scope *S, SourceLocation OpLoc,
Richard Trieuba63ce62011-09-09 01:45:06 +00008978 UnaryOperatorKind Opc, Expr *Input) {
John McCall526ab472011-10-25 17:37:35 +00008979 // First things first: handle placeholders so that the
8980 // overloaded-operator check considers the right type.
8981 if (const BuiltinType *pty = Input->getType()->getAsPlaceholderType()) {
8982 // Increment and decrement of pseudo-object references.
8983 if (pty->getKind() == BuiltinType::PseudoObject &&
8984 UnaryOperator::isIncrementDecrementOp(Opc))
8985 return checkPseudoObjectIncDec(S, OpLoc, Opc, Input);
8986
8987 // extension is always a builtin operator.
8988 if (Opc == UO_Extension)
8989 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
8990
8991 // & gets special logic for several kinds of placeholder.
8992 // The builtin code knows what to do.
8993 if (Opc == UO_AddrOf &&
8994 (pty->getKind() == BuiltinType::Overload ||
8995 pty->getKind() == BuiltinType::UnknownAny ||
8996 pty->getKind() == BuiltinType::BoundMember))
8997 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
8998
8999 // Anything else needs to be handled now.
9000 ExprResult Result = CheckPlaceholderExpr(Input);
9001 if (Result.isInvalid()) return ExprError();
9002 Input = Result.take();
9003 }
9004
David Blaikiebbafb8a2012-03-11 07:00:24 +00009005 if (getLangOpts().CPlusPlus && Input->getType()->isOverloadableType() &&
Douglas Gregor72341032011-12-14 21:23:13 +00009006 UnaryOperator::getOverloadedOperator(Opc) != OO_None &&
9007 !(Opc == UO_AddrOf && isQualifiedMemberAccess(Input))) {
Douglas Gregor084d8552009-03-13 23:49:33 +00009008 // Find all of the overloaded operators visible from this
9009 // point. We perform both an operator-name lookup from the local
9010 // scope and an argument-dependent lookup based on the types of
9011 // the arguments.
John McCall4c4c1df2010-01-26 03:27:55 +00009012 UnresolvedSet<16> Functions;
Douglas Gregor084d8552009-03-13 23:49:33 +00009013 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc);
John McCall4c4c1df2010-01-26 03:27:55 +00009014 if (S && OverOp != OO_None)
9015 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(),
9016 Functions);
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00009017
John McCallb268a282010-08-23 23:25:46 +00009018 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, Input);
Douglas Gregor084d8552009-03-13 23:49:33 +00009019 }
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00009020
John McCallb268a282010-08-23 23:25:46 +00009021 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
Douglas Gregor084d8552009-03-13 23:49:33 +00009022}
9023
Douglas Gregor5287f092009-11-05 00:51:44 +00009024// Unary Operators. 'Tok' is the token for the operator.
John McCalldadc5752010-08-24 06:29:42 +00009025ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
John McCall424cec92011-01-19 06:33:43 +00009026 tok::TokenKind Op, Expr *Input) {
John McCallb268a282010-08-23 23:25:46 +00009027 return BuildUnaryOp(S, OpLoc, ConvertTokenKindToUnaryOpcode(Op), Input);
Douglas Gregor5287f092009-11-05 00:51:44 +00009028}
9029
Steve Naroff66356bd2007-09-16 14:56:35 +00009030/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
Chris Lattnerc8e630e2011-02-17 07:39:24 +00009031ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
Chris Lattnercab02a62011-02-17 20:34:02 +00009032 LabelDecl *TheDecl) {
Chris Lattnerc8e630e2011-02-17 07:39:24 +00009033 TheDecl->setUsed();
Chris Lattnereefa10e2007-05-28 06:56:27 +00009034 // Create the AST node. The address of a label always has type 'void*'.
Chris Lattnerc8e630e2011-02-17 07:39:24 +00009035 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, TheDecl,
Sebastian Redl6d4256c2009-03-15 17:47:39 +00009036 Context.getPointerType(Context.VoidTy)));
Chris Lattnereefa10e2007-05-28 06:56:27 +00009037}
9038
John McCall31168b02011-06-15 23:02:42 +00009039/// Given the last statement in a statement-expression, check whether
9040/// the result is a producing expression (like a call to an
9041/// ns_returns_retained function) and, if so, rebuild it to hoist the
9042/// release out of the full-expression. Otherwise, return null.
9043/// Cannot fail.
Richard Trieuba63ce62011-09-09 01:45:06 +00009044static Expr *maybeRebuildARCConsumingStmt(Stmt *Statement) {
John McCall31168b02011-06-15 23:02:42 +00009045 // Should always be wrapped with one of these.
Richard Trieuba63ce62011-09-09 01:45:06 +00009046 ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(Statement);
John McCall31168b02011-06-15 23:02:42 +00009047 if (!cleanups) return 0;
9048
9049 ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(cleanups->getSubExpr());
John McCall2d637d22011-09-10 06:18:15 +00009050 if (!cast || cast->getCastKind() != CK_ARCConsumeObject)
John McCall31168b02011-06-15 23:02:42 +00009051 return 0;
9052
9053 // Splice out the cast. This shouldn't modify any interesting
9054 // features of the statement.
9055 Expr *producer = cast->getSubExpr();
9056 assert(producer->getType() == cast->getType());
9057 assert(producer->getValueKind() == cast->getValueKind());
9058 cleanups->setSubExpr(producer);
9059 return cleanups;
9060}
9061
John McCall3abee492012-04-04 01:27:53 +00009062void Sema::ActOnStartStmtExpr() {
9063 PushExpressionEvaluationContext(ExprEvalContexts.back().Context);
9064}
9065
9066void Sema::ActOnStmtExprError() {
John McCalled7b2782012-04-06 18:20:53 +00009067 // Note that function is also called by TreeTransform when leaving a
9068 // StmtExpr scope without rebuilding anything.
9069
John McCall3abee492012-04-04 01:27:53 +00009070 DiscardCleanupsInEvaluationContext();
9071 PopExpressionEvaluationContext();
9072}
9073
John McCalldadc5752010-08-24 06:29:42 +00009074ExprResult
John McCallb268a282010-08-23 23:25:46 +00009075Sema::ActOnStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
Sebastian Redl6d4256c2009-03-15 17:47:39 +00009076 SourceLocation RPLoc) { // "({..})"
Chris Lattner366727f2007-07-24 16:58:17 +00009077 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!");
9078 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt);
9079
John McCall3abee492012-04-04 01:27:53 +00009080 if (hasAnyUnrecoverableErrorsInThisFunction())
9081 DiscardCleanupsInEvaluationContext();
9082 assert(!ExprNeedsCleanups && "cleanups within StmtExpr not correctly bound!");
9083 PopExpressionEvaluationContext();
9084
Douglas Gregor6cf3f3c2010-03-10 04:54:39 +00009085 bool isFileScope
9086 = (getCurFunctionOrMethodDecl() == 0) && (getCurBlock() == 0);
Chris Lattnera69b0762009-04-25 19:11:05 +00009087 if (isFileScope)
Sebastian Redl6d4256c2009-03-15 17:47:39 +00009088 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope));
Eli Friedman52cc0162009-01-24 23:09:00 +00009089
Chris Lattner366727f2007-07-24 16:58:17 +00009090 // FIXME: there are a variety of strange constraints to enforce here, for
9091 // example, it is not possible to goto into a stmt expression apparently.
9092 // More semantic analysis is needed.
Mike Stump4e1f26a2009-02-19 03:04:26 +00009093
Chris Lattner366727f2007-07-24 16:58:17 +00009094 // If there are sub stmts in the compound stmt, take the type of the last one
9095 // as the type of the stmtexpr.
9096 QualType Ty = Context.VoidTy;
Fariborz Jahanian56143ae2010-10-25 23:27:26 +00009097 bool StmtExprMayBindToTemp = false;
Chris Lattner944d3062008-07-26 19:51:01 +00009098 if (!Compound->body_empty()) {
9099 Stmt *LastStmt = Compound->body_back();
Fariborz Jahanian56143ae2010-10-25 23:27:26 +00009100 LabelStmt *LastLabelStmt = 0;
Chris Lattner944d3062008-07-26 19:51:01 +00009101 // If LastStmt is a label, skip down through into the body.
Fariborz Jahanian56143ae2010-10-25 23:27:26 +00009102 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) {
9103 LastLabelStmt = Label;
Chris Lattner944d3062008-07-26 19:51:01 +00009104 LastStmt = Label->getSubStmt();
Fariborz Jahanian56143ae2010-10-25 23:27:26 +00009105 }
John McCall31168b02011-06-15 23:02:42 +00009106
John Wiegley01296292011-04-08 18:41:53 +00009107 if (Expr *LastE = dyn_cast<Expr>(LastStmt)) {
John McCall34376a62010-12-04 03:47:34 +00009108 // Do function/array conversion on the last expression, but not
9109 // lvalue-to-rvalue. However, initialize an unqualified type.
John Wiegley01296292011-04-08 18:41:53 +00009110 ExprResult LastExpr = DefaultFunctionArrayConversion(LastE);
9111 if (LastExpr.isInvalid())
9112 return ExprError();
9113 Ty = LastExpr.get()->getType().getUnqualifiedType();
John McCall34376a62010-12-04 03:47:34 +00009114
John Wiegley01296292011-04-08 18:41:53 +00009115 if (!Ty->isDependentType() && !LastExpr.get()->isTypeDependent()) {
John McCall31168b02011-06-15 23:02:42 +00009116 // In ARC, if the final expression ends in a consume, splice
9117 // the consume out and bind it later. In the alternate case
9118 // (when dealing with a retainable type), the result
9119 // initialization will create a produce. In both cases the
9120 // result will be +1, and we'll need to balance that out with
9121 // a bind.
9122 if (Expr *rebuiltLastStmt
9123 = maybeRebuildARCConsumingStmt(LastExpr.get())) {
9124 LastExpr = rebuiltLastStmt;
9125 } else {
9126 LastExpr = PerformCopyInitialization(
Fariborz Jahanian56143ae2010-10-25 23:27:26 +00009127 InitializedEntity::InitializeResult(LPLoc,
9128 Ty,
9129 false),
9130 SourceLocation(),
John McCall31168b02011-06-15 23:02:42 +00009131 LastExpr);
9132 }
9133
John Wiegley01296292011-04-08 18:41:53 +00009134 if (LastExpr.isInvalid())
Fariborz Jahanian56143ae2010-10-25 23:27:26 +00009135 return ExprError();
John Wiegley01296292011-04-08 18:41:53 +00009136 if (LastExpr.get() != 0) {
Fariborz Jahanian56143ae2010-10-25 23:27:26 +00009137 if (!LastLabelStmt)
John Wiegley01296292011-04-08 18:41:53 +00009138 Compound->setLastStmt(LastExpr.take());
Fariborz Jahanian56143ae2010-10-25 23:27:26 +00009139 else
John Wiegley01296292011-04-08 18:41:53 +00009140 LastLabelStmt->setSubStmt(LastExpr.take());
Fariborz Jahanian56143ae2010-10-25 23:27:26 +00009141 StmtExprMayBindToTemp = true;
9142 }
9143 }
9144 }
Chris Lattner944d3062008-07-26 19:51:01 +00009145 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00009146
Eli Friedmanba961a92009-03-23 00:24:07 +00009147 // FIXME: Check that expression type is complete/non-abstract; statement
9148 // expressions are not lvalues.
Fariborz Jahanian56143ae2010-10-25 23:27:26 +00009149 Expr *ResStmtExpr = new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc);
9150 if (StmtExprMayBindToTemp)
9151 return MaybeBindToTemporary(ResStmtExpr);
9152 return Owned(ResStmtExpr);
Chris Lattner366727f2007-07-24 16:58:17 +00009153}
Steve Naroff78864672007-08-01 22:05:33 +00009154
John McCalldadc5752010-08-24 06:29:42 +00009155ExprResult Sema::BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
John McCall36226622010-10-12 02:09:17 +00009156 TypeSourceInfo *TInfo,
9157 OffsetOfComponent *CompPtr,
9158 unsigned NumComponents,
9159 SourceLocation RParenLoc) {
Douglas Gregor882211c2010-04-28 22:16:22 +00009160 QualType ArgTy = TInfo->getType();
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00009161 bool Dependent = ArgTy->isDependentType();
Abramo Bagnara1108e7b2010-05-20 10:00:11 +00009162 SourceRange TypeRange = TInfo->getTypeLoc().getLocalSourceRange();
Douglas Gregor882211c2010-04-28 22:16:22 +00009163
Chris Lattnerf17bd422007-08-30 17:45:32 +00009164 // We must have at least one component that refers to the type, and the first
9165 // one is known to be a field designator. Verify that the ArgTy represents
9166 // a struct/union/class.
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00009167 if (!Dependent && !ArgTy->isRecordType())
Douglas Gregor882211c2010-04-28 22:16:22 +00009168 return ExprError(Diag(BuiltinLoc, diag::err_offsetof_record_type)
9169 << ArgTy << TypeRange);
9170
9171 // Type must be complete per C99 7.17p3 because a declaring a variable
9172 // with an incomplete type would be ill-formed.
9173 if (!Dependent
9174 && RequireCompleteType(BuiltinLoc, ArgTy,
Douglas Gregor7bfb2d02012-05-04 16:32:21 +00009175 diag::err_offsetof_incomplete_type, TypeRange))
Douglas Gregor882211c2010-04-28 22:16:22 +00009176 return ExprError();
9177
Chris Lattner78502cf2007-08-31 21:49:13 +00009178 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a
9179 // GCC extension, diagnose them.
Eli Friedman988a16b2009-02-27 06:44:11 +00009180 // FIXME: This diagnostic isn't actually visible because the location is in
9181 // a system header!
Chris Lattner78502cf2007-08-31 21:49:13 +00009182 if (NumComponents != 1)
Chris Lattnerf490e152008-11-19 05:27:50 +00009183 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator)
9184 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd);
Douglas Gregor882211c2010-04-28 22:16:22 +00009185
9186 bool DidWarnAboutNonPOD = false;
9187 QualType CurrentType = ArgTy;
9188 typedef OffsetOfExpr::OffsetOfNode OffsetOfNode;
Chris Lattner0e62c1c2011-07-23 10:55:15 +00009189 SmallVector<OffsetOfNode, 4> Comps;
9190 SmallVector<Expr*, 4> Exprs;
Douglas Gregor882211c2010-04-28 22:16:22 +00009191 for (unsigned i = 0; i != NumComponents; ++i) {
9192 const OffsetOfComponent &OC = CompPtr[i];
9193 if (OC.isBrackets) {
9194 // Offset of an array sub-field. TODO: Should we allow vector elements?
9195 if (!CurrentType->isDependentType()) {
9196 const ArrayType *AT = Context.getAsArrayType(CurrentType);
9197 if(!AT)
9198 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type)
9199 << CurrentType);
9200 CurrentType = AT->getElementType();
9201 } else
9202 CurrentType = Context.DependentTy;
9203
Richard Smith9fcc5c32011-10-17 23:29:39 +00009204 ExprResult IdxRval = DefaultLvalueConversion(static_cast<Expr*>(OC.U.E));
9205 if (IdxRval.isInvalid())
9206 return ExprError();
9207 Expr *Idx = IdxRval.take();
9208
Douglas Gregor882211c2010-04-28 22:16:22 +00009209 // The expression must be an integral expression.
9210 // FIXME: An integral constant expression?
Douglas Gregor882211c2010-04-28 22:16:22 +00009211 if (!Idx->isTypeDependent() && !Idx->isValueDependent() &&
9212 !Idx->getType()->isIntegerType())
9213 return ExprError(Diag(Idx->getLocStart(),
9214 diag::err_typecheck_subscript_not_integer)
9215 << Idx->getSourceRange());
Richard Smitheda612882011-10-17 05:48:07 +00009216
Douglas Gregor882211c2010-04-28 22:16:22 +00009217 // Record this array index.
9218 Comps.push_back(OffsetOfNode(OC.LocStart, Exprs.size(), OC.LocEnd));
Richard Smith9fcc5c32011-10-17 23:29:39 +00009219 Exprs.push_back(Idx);
Douglas Gregor882211c2010-04-28 22:16:22 +00009220 continue;
9221 }
9222
9223 // Offset of a field.
9224 if (CurrentType->isDependentType()) {
9225 // We have the offset of a field, but we can't look into the dependent
9226 // type. Just record the identifier of the field.
9227 Comps.push_back(OffsetOfNode(OC.LocStart, OC.U.IdentInfo, OC.LocEnd));
9228 CurrentType = Context.DependentTy;
9229 continue;
9230 }
9231
9232 // We need to have a complete type to look into.
9233 if (RequireCompleteType(OC.LocStart, CurrentType,
9234 diag::err_offsetof_incomplete_type))
9235 return ExprError();
9236
9237 // Look for the designated field.
9238 const RecordType *RC = CurrentType->getAs<RecordType>();
9239 if (!RC)
9240 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type)
9241 << CurrentType);
9242 RecordDecl *RD = RC->getDecl();
9243
9244 // C++ [lib.support.types]p5:
9245 // The macro offsetof accepts a restricted set of type arguments in this
9246 // International Standard. type shall be a POD structure or a POD union
9247 // (clause 9).
Benjamin Kramer9e7876b2012-04-28 11:14:51 +00009248 // C++11 [support.types]p4:
9249 // If type is not a standard-layout class (Clause 9), the results are
9250 // undefined.
Douglas Gregor882211c2010-04-28 22:16:22 +00009251 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
Richard Smith2bf7fdb2013-01-02 11:42:31 +00009252 bool IsSafe = LangOpts.CPlusPlus11? CRD->isStandardLayout() : CRD->isPOD();
Benjamin Kramer9e7876b2012-04-28 11:14:51 +00009253 unsigned DiagID =
Richard Smith2bf7fdb2013-01-02 11:42:31 +00009254 LangOpts.CPlusPlus11? diag::warn_offsetof_non_standardlayout_type
Benjamin Kramer9e7876b2012-04-28 11:14:51 +00009255 : diag::warn_offsetof_non_pod_type;
9256
9257 if (!IsSafe && !DidWarnAboutNonPOD &&
Ted Kremenek55ae3192011-02-23 01:51:43 +00009258 DiagRuntimeBehavior(BuiltinLoc, 0,
Benjamin Kramer9e7876b2012-04-28 11:14:51 +00009259 PDiag(DiagID)
Douglas Gregor882211c2010-04-28 22:16:22 +00009260 << SourceRange(CompPtr[0].LocStart, OC.LocEnd)
9261 << CurrentType))
9262 DidWarnAboutNonPOD = true;
9263 }
9264
9265 // Look for the field.
9266 LookupResult R(*this, OC.U.IdentInfo, OC.LocStart, LookupMemberName);
9267 LookupQualifiedName(R, RD);
9268 FieldDecl *MemberDecl = R.getAsSingle<FieldDecl>();
Francois Pichet783dd6e2010-11-21 06:08:52 +00009269 IndirectFieldDecl *IndirectMemberDecl = 0;
9270 if (!MemberDecl) {
Benjamin Kramer39593702010-11-21 14:11:41 +00009271 if ((IndirectMemberDecl = R.getAsSingle<IndirectFieldDecl>()))
Francois Pichet783dd6e2010-11-21 06:08:52 +00009272 MemberDecl = IndirectMemberDecl->getAnonField();
9273 }
9274
Douglas Gregor882211c2010-04-28 22:16:22 +00009275 if (!MemberDecl)
9276 return ExprError(Diag(BuiltinLoc, diag::err_no_member)
9277 << OC.U.IdentInfo << RD << SourceRange(OC.LocStart,
9278 OC.LocEnd));
9279
Douglas Gregor10982ea2010-04-28 22:36:06 +00009280 // C99 7.17p3:
9281 // (If the specified member is a bit-field, the behavior is undefined.)
9282 //
9283 // We diagnose this as an error.
Richard Smithcaf33902011-10-10 18:28:20 +00009284 if (MemberDecl->isBitField()) {
Douglas Gregor10982ea2010-04-28 22:36:06 +00009285 Diag(OC.LocEnd, diag::err_offsetof_bitfield)
9286 << MemberDecl->getDeclName()
9287 << SourceRange(BuiltinLoc, RParenLoc);
9288 Diag(MemberDecl->getLocation(), diag::note_bitfield_decl);
9289 return ExprError();
9290 }
Eli Friedman74ef7cf2010-08-05 10:11:36 +00009291
9292 RecordDecl *Parent = MemberDecl->getParent();
Francois Pichet783dd6e2010-11-21 06:08:52 +00009293 if (IndirectMemberDecl)
9294 Parent = cast<RecordDecl>(IndirectMemberDecl->getDeclContext());
Eli Friedman74ef7cf2010-08-05 10:11:36 +00009295
Douglas Gregord1702062010-04-29 00:18:15 +00009296 // If the member was found in a base class, introduce OffsetOfNodes for
9297 // the base class indirections.
9298 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
9299 /*DetectVirtual=*/false);
Eli Friedman74ef7cf2010-08-05 10:11:36 +00009300 if (IsDerivedFrom(CurrentType, Context.getTypeDeclType(Parent), Paths)) {
Douglas Gregord1702062010-04-29 00:18:15 +00009301 CXXBasePath &Path = Paths.front();
9302 for (CXXBasePath::iterator B = Path.begin(), BEnd = Path.end();
9303 B != BEnd; ++B)
9304 Comps.push_back(OffsetOfNode(B->Base));
9305 }
Eli Friedman74ef7cf2010-08-05 10:11:36 +00009306
Francois Pichet783dd6e2010-11-21 06:08:52 +00009307 if (IndirectMemberDecl) {
9308 for (IndirectFieldDecl::chain_iterator FI =
9309 IndirectMemberDecl->chain_begin(),
9310 FEnd = IndirectMemberDecl->chain_end(); FI != FEnd; FI++) {
9311 assert(isa<FieldDecl>(*FI));
9312 Comps.push_back(OffsetOfNode(OC.LocStart,
9313 cast<FieldDecl>(*FI), OC.LocEnd));
9314 }
9315 } else
Douglas Gregor882211c2010-04-28 22:16:22 +00009316 Comps.push_back(OffsetOfNode(OC.LocStart, MemberDecl, OC.LocEnd));
Francois Pichet783dd6e2010-11-21 06:08:52 +00009317
Douglas Gregor882211c2010-04-28 22:16:22 +00009318 CurrentType = MemberDecl->getType().getNonReferenceType();
9319 }
9320
9321 return Owned(OffsetOfExpr::Create(Context, Context.getSizeType(), BuiltinLoc,
Benjamin Kramerc215e762012-08-24 11:54:20 +00009322 TInfo, Comps, Exprs, RParenLoc));
Douglas Gregor882211c2010-04-28 22:16:22 +00009323}
Mike Stump4e1f26a2009-02-19 03:04:26 +00009324
John McCalldadc5752010-08-24 06:29:42 +00009325ExprResult Sema::ActOnBuiltinOffsetOf(Scope *S,
John McCall36226622010-10-12 02:09:17 +00009326 SourceLocation BuiltinLoc,
9327 SourceLocation TypeLoc,
Richard Trieuba63ce62011-09-09 01:45:06 +00009328 ParsedType ParsedArgTy,
John McCall36226622010-10-12 02:09:17 +00009329 OffsetOfComponent *CompPtr,
9330 unsigned NumComponents,
Richard Trieuba63ce62011-09-09 01:45:06 +00009331 SourceLocation RParenLoc) {
John McCall36226622010-10-12 02:09:17 +00009332
Douglas Gregor882211c2010-04-28 22:16:22 +00009333 TypeSourceInfo *ArgTInfo;
Richard Trieuba63ce62011-09-09 01:45:06 +00009334 QualType ArgTy = GetTypeFromParser(ParsedArgTy, &ArgTInfo);
Douglas Gregor882211c2010-04-28 22:16:22 +00009335 if (ArgTy.isNull())
9336 return ExprError();
9337
Eli Friedman06dcfd92010-08-05 10:15:45 +00009338 if (!ArgTInfo)
9339 ArgTInfo = Context.getTrivialTypeSourceInfo(ArgTy, TypeLoc);
9340
9341 return BuildBuiltinOffsetOf(BuiltinLoc, ArgTInfo, CompPtr, NumComponents,
Richard Trieuba63ce62011-09-09 01:45:06 +00009342 RParenLoc);
Chris Lattnerf17bd422007-08-30 17:45:32 +00009343}
9344
9345
John McCalldadc5752010-08-24 06:29:42 +00009346ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc,
John McCall36226622010-10-12 02:09:17 +00009347 Expr *CondExpr,
9348 Expr *LHSExpr, Expr *RHSExpr,
9349 SourceLocation RPLoc) {
Steve Naroff9efdabc2007-08-03 21:21:27 +00009350 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)");
9351
John McCall7decc9e2010-11-18 06:31:45 +00009352 ExprValueKind VK = VK_RValue;
9353 ExprObjectKind OK = OK_Ordinary;
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00009354 QualType resType;
Douglas Gregor56751b52009-09-25 04:25:58 +00009355 bool ValueDependent = false;
Douglas Gregor0df91122009-05-19 22:43:30 +00009356 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) {
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00009357 resType = Context.DependentTy;
Douglas Gregor56751b52009-09-25 04:25:58 +00009358 ValueDependent = true;
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00009359 } else {
9360 // The conditional expression is required to be a constant expression.
9361 llvm::APSInt condEval(32);
Douglas Gregore2b37442012-05-04 22:38:52 +00009362 ExprResult CondICE
9363 = VerifyIntegerConstantExpression(CondExpr, &condEval,
9364 diag::err_typecheck_choose_expr_requires_constant, false);
Richard Smithf4c51d92012-02-04 09:53:13 +00009365 if (CondICE.isInvalid())
9366 return ExprError();
9367 CondExpr = CondICE.take();
Steve Naroff9efdabc2007-08-03 21:21:27 +00009368
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00009369 // If the condition is > zero, then the AST type is the same as the LSHExpr.
John McCall7decc9e2010-11-18 06:31:45 +00009370 Expr *ActiveExpr = condEval.getZExtValue() ? LHSExpr : RHSExpr;
9371
9372 resType = ActiveExpr->getType();
9373 ValueDependent = ActiveExpr->isValueDependent();
9374 VK = ActiveExpr->getValueKind();
9375 OK = ActiveExpr->getObjectKind();
Sebastian Redl8d2ccae2009-02-26 14:39:58 +00009376 }
9377
Sebastian Redl6d4256c2009-03-15 17:47:39 +00009378 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr,
John McCall7decc9e2010-11-18 06:31:45 +00009379 resType, VK, OK, RPLoc,
Douglas Gregor56751b52009-09-25 04:25:58 +00009380 resType->isDependentType(),
9381 ValueDependent));
Steve Naroff9efdabc2007-08-03 21:21:27 +00009382}
9383
Steve Naroffc540d662008-09-03 18:15:37 +00009384//===----------------------------------------------------------------------===//
9385// Clang Extensions.
9386//===----------------------------------------------------------------------===//
9387
9388/// ActOnBlockStart - This callback is invoked when a block literal is started.
Richard Trieuba63ce62011-09-09 01:45:06 +00009389void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *CurScope) {
Douglas Gregor9a28e842010-03-01 23:15:13 +00009390 BlockDecl *Block = BlockDecl::Create(Context, CurContext, CaretLoc);
Richard Trieuba63ce62011-09-09 01:45:06 +00009391 PushBlockScope(CurScope, Block);
Douglas Gregor9a28e842010-03-01 23:15:13 +00009392 CurContext->addDecl(Block);
Richard Trieuba63ce62011-09-09 01:45:06 +00009393 if (CurScope)
9394 PushDeclContext(CurScope, Block);
Fariborz Jahanian1babe772010-07-09 18:44:02 +00009395 else
9396 CurContext = Block;
John McCallf1a3c2a2011-11-11 03:19:12 +00009397
Eli Friedman34b49062012-01-26 03:00:14 +00009398 getCurBlock()->HasImplicitReturnType = true;
9399
John McCallf1a3c2a2011-11-11 03:19:12 +00009400 // Enter a new evaluation context to insulate the block from any
9401 // cleanups from the enclosing full-expression.
9402 PushExpressionEvaluationContext(PotentiallyEvaluated);
Steve Naroff1d95e5a2008-10-10 01:28:17 +00009403}
9404
Douglas Gregor7efd007c2012-06-15 16:59:29 +00009405void Sema::ActOnBlockArguments(SourceLocation CaretLoc, Declarator &ParamInfo,
9406 Scope *CurScope) {
Mike Stumpf70bcf72009-05-07 18:43:07 +00009407 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!");
John McCall3882ace2011-01-05 12:14:39 +00009408 assert(ParamInfo.getContext() == Declarator::BlockLiteralContext);
Douglas Gregor9a28e842010-03-01 23:15:13 +00009409 BlockScopeInfo *CurBlock = getCurBlock();
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00009410
John McCall8cb7bdf2010-06-04 23:28:52 +00009411 TypeSourceInfo *Sig = GetTypeForDeclarator(ParamInfo, CurScope);
John McCall8cb7bdf2010-06-04 23:28:52 +00009412 QualType T = Sig->getType();
Mike Stump82f071f2009-02-04 22:31:32 +00009413
Douglas Gregor7efd007c2012-06-15 16:59:29 +00009414 // FIXME: We should allow unexpanded parameter packs here, but that would,
9415 // in turn, make the block expression contain unexpanded parameter packs.
9416 if (DiagnoseUnexpandedParameterPack(CaretLoc, Sig, UPPC_Block)) {
9417 // Drop the parameters.
9418 FunctionProtoType::ExtProtoInfo EPI;
9419 EPI.HasTrailingReturn = false;
9420 EPI.TypeQuals |= DeclSpec::TQ_const;
9421 T = Context.getFunctionType(Context.DependentTy, /*Args=*/0, /*NumArgs=*/0,
9422 EPI);
9423 Sig = Context.getTrivialTypeSourceInfo(T);
9424 }
9425
John McCall3882ace2011-01-05 12:14:39 +00009426 // GetTypeForDeclarator always produces a function type for a block
9427 // literal signature. Furthermore, it is always a FunctionProtoType
9428 // unless the function was written with a typedef.
9429 assert(T->isFunctionType() &&
9430 "GetTypeForDeclarator made a non-function block signature");
9431
9432 // Look for an explicit signature in that function type.
9433 FunctionProtoTypeLoc ExplicitSignature;
9434
9435 TypeLoc tmp = Sig->getTypeLoc().IgnoreParens();
9436 if (isa<FunctionProtoTypeLoc>(tmp)) {
9437 ExplicitSignature = cast<FunctionProtoTypeLoc>(tmp);
9438
9439 // Check whether that explicit signature was synthesized by
9440 // GetTypeForDeclarator. If so, don't save that as part of the
9441 // written signature.
Abramo Bagnaraf2a79d92011-03-12 11:17:06 +00009442 if (ExplicitSignature.getLocalRangeBegin() ==
9443 ExplicitSignature.getLocalRangeEnd()) {
John McCall3882ace2011-01-05 12:14:39 +00009444 // This would be much cheaper if we stored TypeLocs instead of
9445 // TypeSourceInfos.
9446 TypeLoc Result = ExplicitSignature.getResultLoc();
9447 unsigned Size = Result.getFullDataSize();
9448 Sig = Context.CreateTypeSourceInfo(Result.getType(), Size);
9449 Sig->getTypeLoc().initializeFullCopy(Result, Size);
9450
9451 ExplicitSignature = FunctionProtoTypeLoc();
9452 }
John McCalla3ccba02010-06-04 11:21:44 +00009453 }
Mike Stump11289f42009-09-09 15:08:12 +00009454
John McCall3882ace2011-01-05 12:14:39 +00009455 CurBlock->TheDecl->setSignatureAsWritten(Sig);
9456 CurBlock->FunctionType = T;
9457
9458 const FunctionType *Fn = T->getAs<FunctionType>();
9459 QualType RetTy = Fn->getResultType();
9460 bool isVariadic =
9461 (isa<FunctionProtoType>(Fn) && cast<FunctionProtoType>(Fn)->isVariadic());
9462
John McCall8e346702010-06-04 19:02:56 +00009463 CurBlock->TheDecl->setIsVariadic(isVariadic);
Douglas Gregorb92a1562010-02-03 00:27:59 +00009464
John McCalla3ccba02010-06-04 11:21:44 +00009465 // Don't allow returning a objc interface by value.
9466 if (RetTy->isObjCObjectType()) {
Daniel Dunbar62ee6412012-03-09 18:35:03 +00009467 Diag(ParamInfo.getLocStart(),
John McCalla3ccba02010-06-04 11:21:44 +00009468 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy;
9469 return;
9470 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00009471
John McCalla3ccba02010-06-04 11:21:44 +00009472 // Context.DependentTy is used as a placeholder for a missing block
John McCall8e346702010-06-04 19:02:56 +00009473 // return type. TODO: what should we do with declarators like:
9474 // ^ * { ... }
9475 // If the answer is "apply template argument deduction"....
Fariborz Jahaniandd5eb9d2011-12-03 17:47:53 +00009476 if (RetTy != Context.DependentTy) {
John McCalla3ccba02010-06-04 11:21:44 +00009477 CurBlock->ReturnType = RetTy;
Fariborz Jahaniandd5eb9d2011-12-03 17:47:53 +00009478 CurBlock->TheDecl->setBlockMissingReturnType(false);
Eli Friedman34b49062012-01-26 03:00:14 +00009479 CurBlock->HasImplicitReturnType = false;
Fariborz Jahaniandd5eb9d2011-12-03 17:47:53 +00009480 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00009481
John McCalla3ccba02010-06-04 11:21:44 +00009482 // Push block parameters from the declarator if we had them.
Chris Lattner0e62c1c2011-07-23 10:55:15 +00009483 SmallVector<ParmVarDecl*, 8> Params;
John McCall3882ace2011-01-05 12:14:39 +00009484 if (ExplicitSignature) {
9485 for (unsigned I = 0, E = ExplicitSignature.getNumArgs(); I != E; ++I) {
9486 ParmVarDecl *Param = ExplicitSignature.getArg(I);
Fariborz Jahanian5ec502e2010-02-12 21:53:14 +00009487 if (Param->getIdentifier() == 0 &&
9488 !Param->isImplicit() &&
9489 !Param->isInvalidDecl() &&
David Blaikiebbafb8a2012-03-11 07:00:24 +00009490 !getLangOpts().CPlusPlus)
Fariborz Jahanian5ec502e2010-02-12 21:53:14 +00009491 Diag(Param->getLocation(), diag::err_parameter_name_omitted);
John McCall8e346702010-06-04 19:02:56 +00009492 Params.push_back(Param);
Fariborz Jahanian5ec502e2010-02-12 21:53:14 +00009493 }
John McCalla3ccba02010-06-04 11:21:44 +00009494
9495 // Fake up parameter variables if we have a typedef, like
9496 // ^ fntype { ... }
9497 } else if (const FunctionProtoType *Fn = T->getAs<FunctionProtoType>()) {
9498 for (FunctionProtoType::arg_type_iterator
9499 I = Fn->arg_type_begin(), E = Fn->arg_type_end(); I != E; ++I) {
9500 ParmVarDecl *Param =
9501 BuildParmVarDeclForTypedef(CurBlock->TheDecl,
Daniel Dunbar62ee6412012-03-09 18:35:03 +00009502 ParamInfo.getLocStart(),
John McCalla3ccba02010-06-04 11:21:44 +00009503 *I);
John McCall8e346702010-06-04 19:02:56 +00009504 Params.push_back(Param);
John McCalla3ccba02010-06-04 11:21:44 +00009505 }
Steve Naroffc540d662008-09-03 18:15:37 +00009506 }
John McCalla3ccba02010-06-04 11:21:44 +00009507
John McCall8e346702010-06-04 19:02:56 +00009508 // Set the parameters on the block decl.
Douglas Gregorb524d902010-11-01 18:37:59 +00009509 if (!Params.empty()) {
David Blaikie9c70e042011-09-21 18:16:56 +00009510 CurBlock->TheDecl->setParams(Params);
Douglas Gregorb524d902010-11-01 18:37:59 +00009511 CheckParmsForFunctionDef(CurBlock->TheDecl->param_begin(),
9512 CurBlock->TheDecl->param_end(),
9513 /*CheckParameterNames=*/false);
9514 }
9515
John McCalla3ccba02010-06-04 11:21:44 +00009516 // Finally we can process decl attributes.
Douglas Gregor758a8692009-06-17 21:51:59 +00009517 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo);
John McCalldf8b37c2010-03-22 09:20:08 +00009518
John McCalla3ccba02010-06-04 11:21:44 +00009519 // Put the parameter variables in scope. We can bail out immediately
9520 // if we don't have any.
John McCall8e346702010-06-04 19:02:56 +00009521 if (Params.empty())
John McCalla3ccba02010-06-04 11:21:44 +00009522 return;
9523
Steve Naroff1d95e5a2008-10-10 01:28:17 +00009524 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(),
John McCallf7b2fb52010-01-22 00:28:27 +00009525 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) {
9526 (*AI)->setOwningFunction(CurBlock->TheDecl);
9527
Steve Naroff1d95e5a2008-10-10 01:28:17 +00009528 // If this has an identifier, add it to the scope stack.
John McCalldf8b37c2010-03-22 09:20:08 +00009529 if ((*AI)->getIdentifier()) {
Argyrios Kyrtzidis1cb0de12010-12-15 18:44:22 +00009530 CheckShadow(CurBlock->TheScope, *AI);
John McCalldf8b37c2010-03-22 09:20:08 +00009531
Steve Naroff1d95e5a2008-10-10 01:28:17 +00009532 PushOnScopeChains(*AI, CurBlock->TheScope);
John McCalldf8b37c2010-03-22 09:20:08 +00009533 }
John McCallf7b2fb52010-01-22 00:28:27 +00009534 }
Steve Naroffc540d662008-09-03 18:15:37 +00009535}
9536
9537/// ActOnBlockError - If there is an error parsing a block, this callback
9538/// is invoked to pop the information about the block from the action impl.
9539void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) {
John McCallf1a3c2a2011-11-11 03:19:12 +00009540 // Leave the expression-evaluation context.
9541 DiscardCleanupsInEvaluationContext();
9542 PopExpressionEvaluationContext();
9543
Steve Naroffc540d662008-09-03 18:15:37 +00009544 // Pop off CurBlock, handle nested blocks.
Chris Lattner41b86942009-04-21 22:38:46 +00009545 PopDeclContext();
Eli Friedman71c80552012-01-05 03:35:19 +00009546 PopFunctionScopeInfo();
Steve Naroffc540d662008-09-03 18:15:37 +00009547}
9548
9549/// ActOnBlockStmtExpr - This is called when the body of a block statement
9550/// literal was successfully completed. ^(int x){...}
John McCalldadc5752010-08-24 06:29:42 +00009551ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
Chris Lattner60f84492011-02-17 23:58:47 +00009552 Stmt *Body, Scope *CurScope) {
Chris Lattner9eac9312009-03-27 04:18:06 +00009553 // If blocks are disabled, emit an error.
9554 if (!LangOpts.Blocks)
9555 Diag(CaretLoc, diag::err_blocks_disable);
Mike Stump11289f42009-09-09 15:08:12 +00009556
John McCallf1a3c2a2011-11-11 03:19:12 +00009557 // Leave the expression-evaluation context.
John McCall85110b42012-03-08 22:00:17 +00009558 if (hasAnyUnrecoverableErrorsInThisFunction())
9559 DiscardCleanupsInEvaluationContext();
John McCallf1a3c2a2011-11-11 03:19:12 +00009560 assert(!ExprNeedsCleanups && "cleanups within block not correctly bound!");
9561 PopExpressionEvaluationContext();
9562
Douglas Gregor9a28e842010-03-01 23:15:13 +00009563 BlockScopeInfo *BSI = cast<BlockScopeInfo>(FunctionScopes.back());
Jordan Rosed39e5f12012-07-02 21:19:23 +00009564
9565 if (BSI->HasImplicitReturnType)
9566 deduceClosureReturnType(*BSI);
9567
Steve Naroff1d95e5a2008-10-10 01:28:17 +00009568 PopDeclContext();
9569
Steve Naroffc540d662008-09-03 18:15:37 +00009570 QualType RetTy = Context.VoidTy;
Fariborz Jahanian3fd73102009-06-19 23:37:08 +00009571 if (!BSI->ReturnType.isNull())
9572 RetTy = BSI->ReturnType;
Mike Stump4e1f26a2009-02-19 03:04:26 +00009573
Mike Stump3bf1ab42009-07-28 22:04:01 +00009574 bool NoReturn = BSI->TheDecl->getAttr<NoReturnAttr>();
Steve Naroffc540d662008-09-03 18:15:37 +00009575 QualType BlockTy;
John McCall8e346702010-06-04 19:02:56 +00009576
John McCallc63de662011-02-02 13:00:07 +00009577 // Set the captured variables on the block.
Eli Friedman20139d32012-01-11 02:36:31 +00009578 // FIXME: Share capture structure between BlockDecl and CapturingScopeInfo!
9579 SmallVector<BlockDecl::Capture, 4> Captures;
9580 for (unsigned i = 0, e = BSI->Captures.size(); i != e; i++) {
9581 CapturingScopeInfo::Capture &Cap = BSI->Captures[i];
9582 if (Cap.isThisCapture())
9583 continue;
Eli Friedman24af8502012-02-03 22:47:37 +00009584 BlockDecl::Capture NewCap(Cap.getVariable(), Cap.isBlockCapture(),
Eli Friedman20139d32012-01-11 02:36:31 +00009585 Cap.isNested(), Cap.getCopyExpr());
9586 Captures.push_back(NewCap);
9587 }
9588 BSI->TheDecl->setCaptures(Context, Captures.begin(), Captures.end(),
9589 BSI->CXXThisCaptureIndex != 0);
John McCallc63de662011-02-02 13:00:07 +00009590
John McCall8e346702010-06-04 19:02:56 +00009591 // If the user wrote a function type in some form, try to use that.
9592 if (!BSI->FunctionType.isNull()) {
9593 const FunctionType *FTy = BSI->FunctionType->getAs<FunctionType>();
9594
9595 FunctionType::ExtInfo Ext = FTy->getExtInfo();
9596 if (NoReturn && !Ext.getNoReturn()) Ext = Ext.withNoReturn(true);
9597
9598 // Turn protoless block types into nullary block types.
9599 if (isa<FunctionNoProtoType>(FTy)) {
John McCalldb40c7f2010-12-14 08:05:40 +00009600 FunctionProtoType::ExtProtoInfo EPI;
9601 EPI.ExtInfo = Ext;
9602 BlockTy = Context.getFunctionType(RetTy, 0, 0, EPI);
John McCall8e346702010-06-04 19:02:56 +00009603
9604 // Otherwise, if we don't need to change anything about the function type,
9605 // preserve its sugar structure.
9606 } else if (FTy->getResultType() == RetTy &&
9607 (!NoReturn || FTy->getNoReturnAttr())) {
9608 BlockTy = BSI->FunctionType;
9609
9610 // Otherwise, make the minimal modifications to the function type.
9611 } else {
9612 const FunctionProtoType *FPT = cast<FunctionProtoType>(FTy);
John McCalldb40c7f2010-12-14 08:05:40 +00009613 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
9614 EPI.TypeQuals = 0; // FIXME: silently?
9615 EPI.ExtInfo = Ext;
John McCall8e346702010-06-04 19:02:56 +00009616 BlockTy = Context.getFunctionType(RetTy,
9617 FPT->arg_type_begin(),
9618 FPT->getNumArgs(),
John McCalldb40c7f2010-12-14 08:05:40 +00009619 EPI);
John McCall8e346702010-06-04 19:02:56 +00009620 }
9621
9622 // If we don't have a function type, just build one from nothing.
9623 } else {
John McCalldb40c7f2010-12-14 08:05:40 +00009624 FunctionProtoType::ExtProtoInfo EPI;
John McCall31168b02011-06-15 23:02:42 +00009625 EPI.ExtInfo = FunctionType::ExtInfo().withNoReturn(NoReturn);
John McCalldb40c7f2010-12-14 08:05:40 +00009626 BlockTy = Context.getFunctionType(RetTy, 0, 0, EPI);
John McCall8e346702010-06-04 19:02:56 +00009627 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00009628
John McCall8e346702010-06-04 19:02:56 +00009629 DiagnoseUnusedParameters(BSI->TheDecl->param_begin(),
9630 BSI->TheDecl->param_end());
Steve Naroffc540d662008-09-03 18:15:37 +00009631 BlockTy = Context.getBlockPointerType(BlockTy);
Mike Stump4e1f26a2009-02-19 03:04:26 +00009632
Chris Lattner45542ea2009-04-19 05:28:12 +00009633 // If needed, diagnose invalid gotos and switches in the block.
John McCall31168b02011-06-15 23:02:42 +00009634 if (getCurFunction()->NeedsScopeChecking() &&
Douglas Gregor5d944db2012-08-17 05:12:08 +00009635 !hasAnyUnrecoverableErrorsInThisFunction() &&
9636 !PP.isCodeCompletionEnabled())
John McCallb268a282010-08-23 23:25:46 +00009637 DiagnoseInvalidJumps(cast<CompoundStmt>(Body));
Mike Stump11289f42009-09-09 15:08:12 +00009638
Chris Lattner60f84492011-02-17 23:58:47 +00009639 BSI->TheDecl->setBody(cast<CompoundStmt>(Body));
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00009640
Jordan Rosed39e5f12012-07-02 21:19:23 +00009641 // Try to apply the named return value optimization. We have to check again
9642 // if we can do this, though, because blocks keep return statements around
9643 // to deduce an implicit return type.
9644 if (getLangOpts().CPlusPlus && RetTy->isRecordType() &&
9645 !BSI->TheDecl->isDependentContext())
9646 computeNRVO(Body, getCurBlock());
Douglas Gregor49695f02011-09-06 20:46:03 +00009647
Benjamin Kramera4fb8362011-07-12 14:11:05 +00009648 BlockExpr *Result = new (Context) BlockExpr(BSI->TheDecl, BlockTy);
9649 const AnalysisBasedWarnings::Policy &WP = AnalysisWarnings.getDefaultPolicy();
Eli Friedman71c80552012-01-05 03:35:19 +00009650 PopFunctionScopeInfo(&WP, Result->getBlockDecl(), Result);
Benjamin Kramera4fb8362011-07-12 14:11:05 +00009651
John McCall28fc7092011-11-10 05:35:25 +00009652 // If the block isn't obviously global, i.e. it captures anything at
John McCalld2393872012-04-13 01:08:17 +00009653 // all, then we need to do a few things in the surrounding context:
John McCall28fc7092011-11-10 05:35:25 +00009654 if (Result->getBlockDecl()->hasCaptures()) {
John McCalld2393872012-04-13 01:08:17 +00009655 // First, this expression has a new cleanup object.
John McCall28fc7092011-11-10 05:35:25 +00009656 ExprCleanupObjects.push_back(Result->getBlockDecl());
9657 ExprNeedsCleanups = true;
John McCalld2393872012-04-13 01:08:17 +00009658
9659 // It also gets a branch-protected scope if any of the captured
9660 // variables needs destruction.
9661 for (BlockDecl::capture_const_iterator
9662 ci = Result->getBlockDecl()->capture_begin(),
9663 ce = Result->getBlockDecl()->capture_end(); ci != ce; ++ci) {
9664 const VarDecl *var = ci->getVariable();
9665 if (var->getType().isDestructedType() != QualType::DK_none) {
9666 getCurFunction()->setHasBranchProtectedScope();
9667 break;
9668 }
9669 }
John McCall28fc7092011-11-10 05:35:25 +00009670 }
Fariborz Jahanian197c68c2012-03-06 18:41:35 +00009671
Douglas Gregor9a28e842010-03-01 23:15:13 +00009672 return Owned(Result);
Steve Naroffc540d662008-09-03 18:15:37 +00009673}
9674
John McCalldadc5752010-08-24 06:29:42 +00009675ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc,
Richard Trieuba63ce62011-09-09 01:45:06 +00009676 Expr *E, ParsedType Ty,
Sebastian Redl6d4256c2009-03-15 17:47:39 +00009677 SourceLocation RPLoc) {
Abramo Bagnara27db2392010-08-10 10:06:15 +00009678 TypeSourceInfo *TInfo;
Richard Trieuba63ce62011-09-09 01:45:06 +00009679 GetTypeFromParser(Ty, &TInfo);
9680 return BuildVAArgExpr(BuiltinLoc, E, TInfo, RPLoc);
Abramo Bagnara27db2392010-08-10 10:06:15 +00009681}
9682
John McCalldadc5752010-08-24 06:29:42 +00009683ExprResult Sema::BuildVAArgExpr(SourceLocation BuiltinLoc,
John McCall7decc9e2010-11-18 06:31:45 +00009684 Expr *E, TypeSourceInfo *TInfo,
9685 SourceLocation RPLoc) {
Chris Lattner56382aa2009-04-05 15:49:53 +00009686 Expr *OrigExpr = E;
Mike Stump11289f42009-09-09 15:08:12 +00009687
Eli Friedman121ba0c2008-08-09 23:32:40 +00009688 // Get the va_list type
9689 QualType VaListType = Context.getBuiltinVaListType();
Eli Friedmane2cad652009-05-16 12:46:54 +00009690 if (VaListType->isArrayType()) {
9691 // Deal with implicit array decay; for example, on x86-64,
9692 // va_list is an array, but it's supposed to decay to
9693 // a pointer for va_arg.
Eli Friedman121ba0c2008-08-09 23:32:40 +00009694 VaListType = Context.getArrayDecayedType(VaListType);
Eli Friedmane2cad652009-05-16 12:46:54 +00009695 // Make sure the input expression also decays appropriately.
John Wiegley01296292011-04-08 18:41:53 +00009696 ExprResult Result = UsualUnaryConversions(E);
9697 if (Result.isInvalid())
9698 return ExprError();
9699 E = Result.take();
Logan Chien29574892012-10-20 06:11:33 +00009700 } else if (VaListType->isRecordType() && getLangOpts().CPlusPlus) {
9701 // If va_list is a record type and we are compiling in C++ mode,
9702 // check the argument using reference binding.
9703 InitializedEntity Entity
9704 = InitializedEntity::InitializeParameter(Context,
9705 Context.getLValueReferenceType(VaListType), false);
9706 ExprResult Init = PerformCopyInitialization(Entity, SourceLocation(), E);
9707 if (Init.isInvalid())
9708 return ExprError();
9709 E = Init.takeAs<Expr>();
Eli Friedmane2cad652009-05-16 12:46:54 +00009710 } else {
9711 // Otherwise, the va_list argument must be an l-value because
9712 // it is modified by va_arg.
Mike Stump11289f42009-09-09 15:08:12 +00009713 if (!E->isTypeDependent() &&
Douglas Gregorad3150c2009-05-19 23:10:31 +00009714 CheckForModifiableLvalue(E, BuiltinLoc, *this))
Eli Friedmane2cad652009-05-16 12:46:54 +00009715 return ExprError();
9716 }
Eli Friedman121ba0c2008-08-09 23:32:40 +00009717
Douglas Gregorad3150c2009-05-19 23:10:31 +00009718 if (!E->isTypeDependent() &&
9719 !Context.hasSameType(VaListType, E->getType())) {
Sebastian Redl6d4256c2009-03-15 17:47:39 +00009720 return ExprError(Diag(E->getLocStart(),
9721 diag::err_first_argument_to_va_arg_not_of_type_va_list)
Chris Lattner56382aa2009-04-05 15:49:53 +00009722 << OrigExpr->getType() << E->getSourceRange());
Chris Lattner3f5cd772009-04-05 00:59:53 +00009723 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00009724
David Majnemerc75d1a12011-06-14 05:17:32 +00009725 if (!TInfo->getType()->isDependentType()) {
9726 if (RequireCompleteType(TInfo->getTypeLoc().getBeginLoc(), TInfo->getType(),
Douglas Gregor7bfb2d02012-05-04 16:32:21 +00009727 diag::err_second_parameter_to_va_arg_incomplete,
9728 TInfo->getTypeLoc()))
David Majnemerc75d1a12011-06-14 05:17:32 +00009729 return ExprError();
David Majnemer254a5c02011-06-13 06:37:03 +00009730
David Majnemerc75d1a12011-06-14 05:17:32 +00009731 if (RequireNonAbstractType(TInfo->getTypeLoc().getBeginLoc(),
Douglas Gregorae298422012-05-04 17:09:59 +00009732 TInfo->getType(),
9733 diag::err_second_parameter_to_va_arg_abstract,
9734 TInfo->getTypeLoc()))
David Majnemerc75d1a12011-06-14 05:17:32 +00009735 return ExprError();
9736
Douglas Gregor7e1eb932011-07-30 06:45:27 +00009737 if (!TInfo->getType().isPODType(Context)) {
David Majnemerc75d1a12011-06-14 05:17:32 +00009738 Diag(TInfo->getTypeLoc().getBeginLoc(),
Douglas Gregor7e1eb932011-07-30 06:45:27 +00009739 TInfo->getType()->isObjCLifetimeType()
9740 ? diag::warn_second_parameter_to_va_arg_ownership_qualified
9741 : diag::warn_second_parameter_to_va_arg_not_pod)
David Majnemerc75d1a12011-06-14 05:17:32 +00009742 << TInfo->getType()
9743 << TInfo->getTypeLoc().getSourceRange();
Douglas Gregor7e1eb932011-07-30 06:45:27 +00009744 }
Eli Friedman6290ae42011-07-11 21:45:59 +00009745
9746 // Check for va_arg where arguments of the given type will be promoted
9747 // (i.e. this va_arg is guaranteed to have undefined behavior).
9748 QualType PromoteType;
9749 if (TInfo->getType()->isPromotableIntegerType()) {
9750 PromoteType = Context.getPromotedIntegerType(TInfo->getType());
9751 if (Context.typesAreCompatible(PromoteType, TInfo->getType()))
9752 PromoteType = QualType();
9753 }
9754 if (TInfo->getType()->isSpecificBuiltinType(BuiltinType::Float))
9755 PromoteType = Context.DoubleTy;
9756 if (!PromoteType.isNull())
Ted Kremeneka0461692013-01-08 01:50:40 +00009757 DiagRuntimeBehavior(TInfo->getTypeLoc().getBeginLoc(), E,
9758 PDiag(diag::warn_second_parameter_to_va_arg_never_compatible)
9759 << TInfo->getType()
9760 << PromoteType
9761 << TInfo->getTypeLoc().getSourceRange());
David Majnemerc75d1a12011-06-14 05:17:32 +00009762 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00009763
Abramo Bagnara27db2392010-08-10 10:06:15 +00009764 QualType T = TInfo->getType().getNonLValueExprType(Context);
9765 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, TInfo, RPLoc, T));
Anders Carlsson7e13ab82007-10-15 20:28:48 +00009766}
9767
John McCalldadc5752010-08-24 06:29:42 +00009768ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) {
Douglas Gregor3be4b122008-11-29 04:51:27 +00009769 // The type of __null will be int or long, depending on the size of
9770 // pointers on the target.
9771 QualType Ty;
Douglas Gregore8bbc122011-09-02 00:18:52 +00009772 unsigned pw = Context.getTargetInfo().getPointerWidth(0);
9773 if (pw == Context.getTargetInfo().getIntWidth())
Douglas Gregor3be4b122008-11-29 04:51:27 +00009774 Ty = Context.IntTy;
Douglas Gregore8bbc122011-09-02 00:18:52 +00009775 else if (pw == Context.getTargetInfo().getLongWidth())
Douglas Gregor3be4b122008-11-29 04:51:27 +00009776 Ty = Context.LongTy;
Douglas Gregore8bbc122011-09-02 00:18:52 +00009777 else if (pw == Context.getTargetInfo().getLongLongWidth())
NAKAMURA Takumi0d13fd32011-01-19 00:11:41 +00009778 Ty = Context.LongLongTy;
9779 else {
David Blaikie83d382b2011-09-23 05:06:16 +00009780 llvm_unreachable("I don't know size of pointer!");
NAKAMURA Takumi0d13fd32011-01-19 00:11:41 +00009781 }
Douglas Gregor3be4b122008-11-29 04:51:27 +00009782
Sebastian Redl6d4256c2009-03-15 17:47:39 +00009783 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc));
Douglas Gregor3be4b122008-11-29 04:51:27 +00009784}
9785
Alexis Huntc46382e2010-04-28 23:02:27 +00009786static void MakeObjCStringLiteralFixItHint(Sema& SemaRef, QualType DstType,
Douglas Gregora771f462010-03-31 17:46:05 +00009787 Expr *SrcExpr, FixItHint &Hint) {
David Blaikiebbafb8a2012-03-11 07:00:24 +00009788 if (!SemaRef.getLangOpts().ObjC1)
Anders Carlssonace5d072009-11-10 04:46:30 +00009789 return;
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00009790
Anders Carlssonace5d072009-11-10 04:46:30 +00009791 const ObjCObjectPointerType *PT = DstType->getAs<ObjCObjectPointerType>();
9792 if (!PT)
9793 return;
9794
9795 // Check if the destination is of type 'id'.
9796 if (!PT->isObjCIdType()) {
9797 // Check if the destination is the 'NSString' interface.
9798 const ObjCInterfaceDecl *ID = PT->getInterfaceDecl();
9799 if (!ID || !ID->getIdentifier()->isStr("NSString"))
9800 return;
9801 }
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00009802
John McCallfe96e0b2011-11-06 09:01:30 +00009803 // Ignore any parens, implicit casts (should only be
9804 // array-to-pointer decays), and not-so-opaque values. The last is
9805 // important for making this trigger for property assignments.
9806 SrcExpr = SrcExpr->IgnoreParenImpCasts();
9807 if (OpaqueValueExpr *OV = dyn_cast<OpaqueValueExpr>(SrcExpr))
9808 if (OV->getSourceExpr())
9809 SrcExpr = OV->getSourceExpr()->IgnoreParenImpCasts();
9810
9811 StringLiteral *SL = dyn_cast<StringLiteral>(SrcExpr);
Douglas Gregorfb65e592011-07-27 05:40:30 +00009812 if (!SL || !SL->isAscii())
Anders Carlssonace5d072009-11-10 04:46:30 +00009813 return;
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00009814
Douglas Gregora771f462010-03-31 17:46:05 +00009815 Hint = FixItHint::CreateInsertion(SL->getLocStart(), "@");
Anders Carlssonace5d072009-11-10 04:46:30 +00009816}
9817
Chris Lattner9bad62c2008-01-04 18:04:52 +00009818bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy,
9819 SourceLocation Loc,
9820 QualType DstType, QualType SrcType,
Douglas Gregor4f4946a2010-04-22 00:20:18 +00009821 Expr *SrcExpr, AssignmentAction Action,
9822 bool *Complained) {
9823 if (Complained)
9824 *Complained = false;
9825
Chris Lattner9bad62c2008-01-04 18:04:52 +00009826 // Decode the result (notice that AST's are still created for extensions).
Douglas Gregor33823722011-06-11 01:09:30 +00009827 bool CheckInferredResultType = false;
Chris Lattner9bad62c2008-01-04 18:04:52 +00009828 bool isInvalid = false;
Eli Friedman381f4312012-02-29 20:59:56 +00009829 unsigned DiagKind = 0;
Douglas Gregora771f462010-03-31 17:46:05 +00009830 FixItHint Hint;
Anna Zaks3b402712011-07-28 19:51:27 +00009831 ConversionFixItGenerator ConvHints;
9832 bool MayHaveConvFixit = false;
Richard Trieucaff2472011-11-23 22:32:32 +00009833 bool MayHaveFunctionDiff = false;
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +00009834
Chris Lattner9bad62c2008-01-04 18:04:52 +00009835 switch (ConvTy) {
Fariborz Jahanian268fec12012-07-17 18:00:08 +00009836 case Compatible:
Daniel Dunbarbd847cc2012-10-15 22:23:53 +00009837 DiagnoseAssignmentEnum(DstType, SrcType, SrcExpr);
9838 return false;
Fariborz Jahanian268fec12012-07-17 18:00:08 +00009839
Chris Lattner940cfeb2008-01-04 18:22:42 +00009840 case PointerToInt:
Chris Lattner9bad62c2008-01-04 18:04:52 +00009841 DiagKind = diag::ext_typecheck_convert_pointer_int;
Anna Zaks3b402712011-07-28 19:51:27 +00009842 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
9843 MayHaveConvFixit = true;
Chris Lattner9bad62c2008-01-04 18:04:52 +00009844 break;
Chris Lattner940cfeb2008-01-04 18:22:42 +00009845 case IntToPointer:
9846 DiagKind = diag::ext_typecheck_convert_int_pointer;
Anna Zaks3b402712011-07-28 19:51:27 +00009847 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
9848 MayHaveConvFixit = true;
Chris Lattner940cfeb2008-01-04 18:22:42 +00009849 break;
Chris Lattner9bad62c2008-01-04 18:04:52 +00009850 case IncompatiblePointer:
Douglas Gregora771f462010-03-31 17:46:05 +00009851 MakeObjCStringLiteralFixItHint(*this, DstType, SrcExpr, Hint);
Chris Lattner9bad62c2008-01-04 18:04:52 +00009852 DiagKind = diag::ext_typecheck_convert_incompatible_pointer;
Douglas Gregor33823722011-06-11 01:09:30 +00009853 CheckInferredResultType = DstType->isObjCObjectPointerType() &&
9854 SrcType->isObjCObjectPointerType();
Anna Zaks3b402712011-07-28 19:51:27 +00009855 if (Hint.isNull() && !CheckInferredResultType) {
9856 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
9857 }
9858 MayHaveConvFixit = true;
Chris Lattner9bad62c2008-01-04 18:04:52 +00009859 break;
Eli Friedman80160bd2009-03-22 23:59:44 +00009860 case IncompatiblePointerSign:
9861 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign;
9862 break;
Chris Lattner9bad62c2008-01-04 18:04:52 +00009863 case FunctionVoidPointer:
9864 DiagKind = diag::ext_typecheck_convert_pointer_void_func;
9865 break;
John McCall4fff8f62011-02-01 00:10:29 +00009866 case IncompatiblePointerDiscardsQualifiers: {
John McCall71de91c2011-02-01 23:28:01 +00009867 // Perform array-to-pointer decay if necessary.
9868 if (SrcType->isArrayType()) SrcType = Context.getArrayDecayedType(SrcType);
9869
John McCall4fff8f62011-02-01 00:10:29 +00009870 Qualifiers lhq = SrcType->getPointeeType().getQualifiers();
9871 Qualifiers rhq = DstType->getPointeeType().getQualifiers();
9872 if (lhq.getAddressSpace() != rhq.getAddressSpace()) {
9873 DiagKind = diag::err_typecheck_incompatible_address_space;
9874 break;
John McCall31168b02011-06-15 23:02:42 +00009875
9876
9877 } else if (lhq.getObjCLifetime() != rhq.getObjCLifetime()) {
Argyrios Kyrtzidiscff00d92011-06-24 00:08:59 +00009878 DiagKind = diag::err_typecheck_incompatible_ownership;
John McCall31168b02011-06-15 23:02:42 +00009879 break;
John McCall4fff8f62011-02-01 00:10:29 +00009880 }
9881
9882 llvm_unreachable("unknown error case for discarding qualifiers!");
9883 // fallthrough
9884 }
Chris Lattner9bad62c2008-01-04 18:04:52 +00009885 case CompatiblePointerDiscardsQualifiers:
Douglas Gregoraa1e21d2008-09-12 00:47:35 +00009886 // If the qualifiers lost were because we were applying the
9887 // (deprecated) C++ conversion from a string literal to a char*
9888 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME:
9889 // Ideally, this check would be performed in
John McCallaba90822011-01-31 23:13:11 +00009890 // checkPointerTypesForAssignment. However, that would require a
Douglas Gregoraa1e21d2008-09-12 00:47:35 +00009891 // bit of refactoring (so that the second argument is an
9892 // expression, rather than a type), which should be done as part
John McCallaba90822011-01-31 23:13:11 +00009893 // of a larger effort to fix checkPointerTypesForAssignment for
Douglas Gregoraa1e21d2008-09-12 00:47:35 +00009894 // C++ semantics.
David Blaikiebbafb8a2012-03-11 07:00:24 +00009895 if (getLangOpts().CPlusPlus &&
Douglas Gregoraa1e21d2008-09-12 00:47:35 +00009896 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType))
9897 return false;
Chris Lattner9bad62c2008-01-04 18:04:52 +00009898 DiagKind = diag::ext_typecheck_convert_discards_qualifiers;
9899 break;
Alexis Hunt6f3de502009-11-08 07:46:34 +00009900 case IncompatibleNestedPointerQualifiers:
Fariborz Jahanianb98dade2009-11-09 22:16:37 +00009901 DiagKind = diag::ext_nested_pointer_qualifier_mismatch;
Fariborz Jahaniand7aa9d82009-11-07 20:20:40 +00009902 break;
Steve Naroff081c7422008-09-04 15:10:53 +00009903 case IntToBlockPointer:
9904 DiagKind = diag::err_int_to_block_pointer;
9905 break;
9906 case IncompatibleBlockPointer:
Mike Stumpd79b5a82009-04-21 22:51:42 +00009907 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer;
Steve Naroff081c7422008-09-04 15:10:53 +00009908 break;
Steve Naroff8afa9892008-10-14 22:18:38 +00009909 case IncompatibleObjCQualifiedId:
Mike Stump4e1f26a2009-02-19 03:04:26 +00009910 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since
Steve Naroff8afa9892008-10-14 22:18:38 +00009911 // it can give a more specific diagnostic.
9912 DiagKind = diag::warn_incompatible_qualified_id;
9913 break;
Anders Carlssondb5a9b62009-01-30 23:17:46 +00009914 case IncompatibleVectors:
9915 DiagKind = diag::warn_incompatible_vectors;
9916 break;
Fariborz Jahanian6f472e82011-07-07 18:55:47 +00009917 case IncompatibleObjCWeakRef:
9918 DiagKind = diag::err_arc_weak_unavailable_assign;
9919 break;
Chris Lattner9bad62c2008-01-04 18:04:52 +00009920 case Incompatible:
9921 DiagKind = diag::err_typecheck_convert_incompatible;
Anna Zaks3b402712011-07-28 19:51:27 +00009922 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
9923 MayHaveConvFixit = true;
Chris Lattner9bad62c2008-01-04 18:04:52 +00009924 isInvalid = true;
Richard Trieucaff2472011-11-23 22:32:32 +00009925 MayHaveFunctionDiff = true;
Chris Lattner9bad62c2008-01-04 18:04:52 +00009926 break;
9927 }
Mike Stump4e1f26a2009-02-19 03:04:26 +00009928
Douglas Gregorc68e1402010-04-09 00:35:39 +00009929 QualType FirstType, SecondType;
9930 switch (Action) {
9931 case AA_Assigning:
9932 case AA_Initializing:
9933 // The destination type comes first.
9934 FirstType = DstType;
9935 SecondType = SrcType;
9936 break;
Alexis Huntc46382e2010-04-28 23:02:27 +00009937
Douglas Gregorc68e1402010-04-09 00:35:39 +00009938 case AA_Returning:
9939 case AA_Passing:
9940 case AA_Converting:
9941 case AA_Sending:
9942 case AA_Casting:
9943 // The source type comes first.
9944 FirstType = SrcType;
9945 SecondType = DstType;
9946 break;
9947 }
Alexis Huntc46382e2010-04-28 23:02:27 +00009948
Anna Zaks3b402712011-07-28 19:51:27 +00009949 PartialDiagnostic FDiag = PDiag(DiagKind);
9950 FDiag << FirstType << SecondType << Action << SrcExpr->getSourceRange();
9951
9952 // If we can fix the conversion, suggest the FixIts.
9953 assert(ConvHints.isNull() || Hint.isNull());
9954 if (!ConvHints.isNull()) {
Benjamin Kramer490afa62012-01-14 21:05:10 +00009955 for (std::vector<FixItHint>::iterator HI = ConvHints.Hints.begin(),
9956 HE = ConvHints.Hints.end(); HI != HE; ++HI)
Anna Zaks3b402712011-07-28 19:51:27 +00009957 FDiag << *HI;
9958 } else {
9959 FDiag << Hint;
9960 }
9961 if (MayHaveConvFixit) { FDiag << (unsigned) (ConvHints.Kind); }
9962
Richard Trieucaff2472011-11-23 22:32:32 +00009963 if (MayHaveFunctionDiff)
9964 HandleFunctionTypeMismatch(FDiag, SecondType, FirstType);
9965
Anna Zaks3b402712011-07-28 19:51:27 +00009966 Diag(Loc, FDiag);
9967
Richard Trieucaff2472011-11-23 22:32:32 +00009968 if (SecondType == Context.OverloadTy)
9969 NoteAllOverloadCandidates(OverloadExpr::find(SrcExpr).Expression,
9970 FirstType);
9971
Douglas Gregor33823722011-06-11 01:09:30 +00009972 if (CheckInferredResultType)
9973 EmitRelatedResultTypeNote(SrcExpr);
9974
Douglas Gregor4f4946a2010-04-22 00:20:18 +00009975 if (Complained)
9976 *Complained = true;
Chris Lattner9bad62c2008-01-04 18:04:52 +00009977 return isInvalid;
9978}
Anders Carlssone54e8a12008-11-30 19:50:32 +00009979
Richard Smithf4c51d92012-02-04 09:53:13 +00009980ExprResult Sema::VerifyIntegerConstantExpression(Expr *E,
9981 llvm::APSInt *Result) {
Douglas Gregore2b37442012-05-04 22:38:52 +00009982 class SimpleICEDiagnoser : public VerifyICEDiagnoser {
9983 public:
9984 virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) {
9985 S.Diag(Loc, diag::err_expr_not_ice) << S.LangOpts.CPlusPlus << SR;
9986 }
9987 } Diagnoser;
9988
9989 return VerifyIntegerConstantExpression(E, Result, Diagnoser);
9990}
9991
9992ExprResult Sema::VerifyIntegerConstantExpression(Expr *E,
9993 llvm::APSInt *Result,
9994 unsigned DiagID,
9995 bool AllowFold) {
9996 class IDDiagnoser : public VerifyICEDiagnoser {
9997 unsigned DiagID;
9998
9999 public:
10000 IDDiagnoser(unsigned DiagID)
10001 : VerifyICEDiagnoser(DiagID == 0), DiagID(DiagID) { }
10002
10003 virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) {
10004 S.Diag(Loc, DiagID) << SR;
10005 }
10006 } Diagnoser(DiagID);
10007
10008 return VerifyIntegerConstantExpression(E, Result, Diagnoser, AllowFold);
10009}
10010
10011void Sema::VerifyICEDiagnoser::diagnoseFold(Sema &S, SourceLocation Loc,
10012 SourceRange SR) {
10013 S.Diag(Loc, diag::ext_expr_not_ice) << SR << S.LangOpts.CPlusPlus;
Richard Smithf4c51d92012-02-04 09:53:13 +000010014}
10015
Benjamin Kramer33adaae2012-04-18 14:22:41 +000010016ExprResult
10017Sema::VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result,
Douglas Gregore2b37442012-05-04 22:38:52 +000010018 VerifyICEDiagnoser &Diagnoser,
10019 bool AllowFold) {
Daniel Dunbar62ee6412012-03-09 18:35:03 +000010020 SourceLocation DiagLoc = E->getLocStart();
Richard Smithf4c51d92012-02-04 09:53:13 +000010021
Richard Smith2bf7fdb2013-01-02 11:42:31 +000010022 if (getLangOpts().CPlusPlus11) {
Richard Smithf4c51d92012-02-04 09:53:13 +000010023 // C++11 [expr.const]p5:
10024 // If an expression of literal class type is used in a context where an
10025 // integral constant expression is required, then that class type shall
10026 // have a single non-explicit conversion function to an integral or
10027 // unscoped enumeration type
10028 ExprResult Converted;
Douglas Gregore2b37442012-05-04 22:38:52 +000010029 if (!Diagnoser.Suppress) {
10030 class CXX11ConvertDiagnoser : public ICEConvertDiagnoser {
10031 public:
10032 CXX11ConvertDiagnoser() : ICEConvertDiagnoser(false, true) { }
10033
10034 virtual DiagnosticBuilder diagnoseNotInt(Sema &S, SourceLocation Loc,
10035 QualType T) {
10036 return S.Diag(Loc, diag::err_ice_not_integral) << T;
10037 }
10038
10039 virtual DiagnosticBuilder diagnoseIncomplete(Sema &S,
10040 SourceLocation Loc,
10041 QualType T) {
10042 return S.Diag(Loc, diag::err_ice_incomplete_type) << T;
10043 }
10044
10045 virtual DiagnosticBuilder diagnoseExplicitConv(Sema &S,
10046 SourceLocation Loc,
10047 QualType T,
10048 QualType ConvTy) {
10049 return S.Diag(Loc, diag::err_ice_explicit_conversion) << T << ConvTy;
10050 }
10051
10052 virtual DiagnosticBuilder noteExplicitConv(Sema &S,
10053 CXXConversionDecl *Conv,
10054 QualType ConvTy) {
10055 return S.Diag(Conv->getLocation(), diag::note_ice_conversion_here)
10056 << ConvTy->isEnumeralType() << ConvTy;
10057 }
10058
10059 virtual DiagnosticBuilder diagnoseAmbiguous(Sema &S, SourceLocation Loc,
10060 QualType T) {
10061 return S.Diag(Loc, diag::err_ice_ambiguous_conversion) << T;
10062 }
10063
10064 virtual DiagnosticBuilder noteAmbiguous(Sema &S,
10065 CXXConversionDecl *Conv,
10066 QualType ConvTy) {
10067 return S.Diag(Conv->getLocation(), diag::note_ice_conversion_here)
10068 << ConvTy->isEnumeralType() << ConvTy;
10069 }
10070
10071 virtual DiagnosticBuilder diagnoseConversion(Sema &S,
10072 SourceLocation Loc,
10073 QualType T,
10074 QualType ConvTy) {
10075 return DiagnosticBuilder::getEmpty();
10076 }
10077 } ConvertDiagnoser;
10078
10079 Converted = ConvertToIntegralOrEnumerationType(DiagLoc, E,
10080 ConvertDiagnoser,
10081 /*AllowScopedEnumerations*/ false);
Richard Smithf4c51d92012-02-04 09:53:13 +000010082 } else {
10083 // The caller wants to silently enquire whether this is an ICE. Don't
10084 // produce any diagnostics if it isn't.
Douglas Gregore2b37442012-05-04 22:38:52 +000010085 class SilentICEConvertDiagnoser : public ICEConvertDiagnoser {
10086 public:
10087 SilentICEConvertDiagnoser() : ICEConvertDiagnoser(true, true) { }
10088
10089 virtual DiagnosticBuilder diagnoseNotInt(Sema &S, SourceLocation Loc,
10090 QualType T) {
10091 return DiagnosticBuilder::getEmpty();
10092 }
10093
10094 virtual DiagnosticBuilder diagnoseIncomplete(Sema &S,
10095 SourceLocation Loc,
10096 QualType T) {
10097 return DiagnosticBuilder::getEmpty();
10098 }
10099
10100 virtual DiagnosticBuilder diagnoseExplicitConv(Sema &S,
10101 SourceLocation Loc,
10102 QualType T,
10103 QualType ConvTy) {
10104 return DiagnosticBuilder::getEmpty();
10105 }
10106
10107 virtual DiagnosticBuilder noteExplicitConv(Sema &S,
10108 CXXConversionDecl *Conv,
10109 QualType ConvTy) {
10110 return DiagnosticBuilder::getEmpty();
10111 }
10112
10113 virtual DiagnosticBuilder diagnoseAmbiguous(Sema &S, SourceLocation Loc,
10114 QualType T) {
10115 return DiagnosticBuilder::getEmpty();
10116 }
10117
10118 virtual DiagnosticBuilder noteAmbiguous(Sema &S,
10119 CXXConversionDecl *Conv,
10120 QualType ConvTy) {
10121 return DiagnosticBuilder::getEmpty();
10122 }
10123
10124 virtual DiagnosticBuilder diagnoseConversion(Sema &S,
10125 SourceLocation Loc,
10126 QualType T,
10127 QualType ConvTy) {
10128 return DiagnosticBuilder::getEmpty();
10129 }
10130 } ConvertDiagnoser;
10131
10132 Converted = ConvertToIntegralOrEnumerationType(DiagLoc, E,
10133 ConvertDiagnoser, false);
Richard Smithf4c51d92012-02-04 09:53:13 +000010134 }
10135 if (Converted.isInvalid())
10136 return Converted;
10137 E = Converted.take();
10138 if (!E->getType()->isIntegralOrUnscopedEnumerationType())
10139 return ExprError();
10140 } else if (!E->getType()->isIntegralOrUnscopedEnumerationType()) {
10141 // An ICE must be of integral or unscoped enumeration type.
Douglas Gregore2b37442012-05-04 22:38:52 +000010142 if (!Diagnoser.Suppress)
10143 Diagnoser.diagnoseNotICE(*this, DiagLoc, E->getSourceRange());
Richard Smithf4c51d92012-02-04 09:53:13 +000010144 return ExprError();
10145 }
10146
Richard Smith902ca212011-12-14 23:32:26 +000010147 // Circumvent ICE checking in C++11 to avoid evaluating the expression twice
10148 // in the non-ICE case.
Richard Smith2bf7fdb2013-01-02 11:42:31 +000010149 if (!getLangOpts().CPlusPlus11 && E->isIntegerConstantExpr(Context)) {
Richard Smithf4c51d92012-02-04 09:53:13 +000010150 if (Result)
10151 *Result = E->EvaluateKnownConstInt(Context);
10152 return Owned(E);
Eli Friedmanbb967cc2009-04-25 22:26:58 +000010153 }
10154
Anders Carlssone54e8a12008-11-30 19:50:32 +000010155 Expr::EvalResult EvalResult;
Dmitri Gribenkof8579502013-01-12 19:30:44 +000010156 SmallVector<PartialDiagnosticAt, 8> Notes;
Richard Smith92b1ce02011-12-12 09:28:41 +000010157 EvalResult.Diag = &Notes;
Anders Carlssone54e8a12008-11-30 19:50:32 +000010158
Richard Smith902ca212011-12-14 23:32:26 +000010159 // Try to evaluate the expression, and produce diagnostics explaining why it's
10160 // not a constant expression as a side-effect.
10161 bool Folded = E->EvaluateAsRValue(EvalResult, Context) &&
10162 EvalResult.Val.isInt() && !EvalResult.HasSideEffects;
10163
10164 // In C++11, we can rely on diagnostics being produced for any expression
10165 // which is not a constant expression. If no diagnostics were produced, then
10166 // this is a constant expression.
Richard Smith2bf7fdb2013-01-02 11:42:31 +000010167 if (Folded && getLangOpts().CPlusPlus11 && Notes.empty()) {
Richard Smith902ca212011-12-14 23:32:26 +000010168 if (Result)
10169 *Result = EvalResult.Val.getInt();
Richard Smithf4c51d92012-02-04 09:53:13 +000010170 return Owned(E);
10171 }
10172
10173 // If our only note is the usual "invalid subexpression" note, just point
10174 // the caret at its location rather than producing an essentially
10175 // redundant note.
10176 if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
10177 diag::note_invalid_subexpr_in_const_expr) {
10178 DiagLoc = Notes[0].first;
10179 Notes.clear();
Richard Smith902ca212011-12-14 23:32:26 +000010180 }
10181
10182 if (!Folded || !AllowFold) {
Douglas Gregore2b37442012-05-04 22:38:52 +000010183 if (!Diagnoser.Suppress) {
10184 Diagnoser.diagnoseNotICE(*this, DiagLoc, E->getSourceRange());
Richard Smith92b1ce02011-12-12 09:28:41 +000010185 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
10186 Diag(Notes[I].first, Notes[I].second);
Anders Carlssone54e8a12008-11-30 19:50:32 +000010187 }
Mike Stump4e1f26a2009-02-19 03:04:26 +000010188
Richard Smithf4c51d92012-02-04 09:53:13 +000010189 return ExprError();
Anders Carlssone54e8a12008-11-30 19:50:32 +000010190 }
10191
Douglas Gregore2b37442012-05-04 22:38:52 +000010192 Diagnoser.diagnoseFold(*this, DiagLoc, E->getSourceRange());
Richard Smith2ec40612012-01-15 03:51:30 +000010193 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
10194 Diag(Notes[I].first, Notes[I].second);
Mike Stump4e1f26a2009-02-19 03:04:26 +000010195
Anders Carlssone54e8a12008-11-30 19:50:32 +000010196 if (Result)
10197 *Result = EvalResult.Val.getInt();
Richard Smithf4c51d92012-02-04 09:53:13 +000010198 return Owned(E);
Anders Carlssone54e8a12008-11-30 19:50:32 +000010199}
Douglas Gregorc9c02ed2009-06-19 23:52:42 +000010200
Eli Friedman456f0182012-01-20 01:26:23 +000010201namespace {
10202 // Handle the case where we conclude a expression which we speculatively
10203 // considered to be unevaluated is actually evaluated.
10204 class TransformToPE : public TreeTransform<TransformToPE> {
10205 typedef TreeTransform<TransformToPE> BaseTransform;
10206
10207 public:
10208 TransformToPE(Sema &SemaRef) : BaseTransform(SemaRef) { }
10209
10210 // Make sure we redo semantic analysis
10211 bool AlwaysRebuild() { return true; }
10212
Eli Friedman5f0ca242012-02-06 23:29:57 +000010213 // Make sure we handle LabelStmts correctly.
10214 // FIXME: This does the right thing, but maybe we need a more general
10215 // fix to TreeTransform?
10216 StmtResult TransformLabelStmt(LabelStmt *S) {
10217 S->getDecl()->setStmt(0);
10218 return BaseTransform::TransformLabelStmt(S);
10219 }
10220
Eli Friedman456f0182012-01-20 01:26:23 +000010221 // We need to special-case DeclRefExprs referring to FieldDecls which
10222 // are not part of a member pointer formation; normal TreeTransforming
10223 // doesn't catch this case because of the way we represent them in the AST.
10224 // FIXME: This is a bit ugly; is it really the best way to handle this
10225 // case?
10226 //
10227 // Error on DeclRefExprs referring to FieldDecls.
10228 ExprResult TransformDeclRefExpr(DeclRefExpr *E) {
10229 if (isa<FieldDecl>(E->getDecl()) &&
David Blaikie131fcb42012-08-06 22:47:24 +000010230 !SemaRef.isUnevaluatedContext())
Eli Friedman456f0182012-01-20 01:26:23 +000010231 return SemaRef.Diag(E->getLocation(),
10232 diag::err_invalid_non_static_member_use)
10233 << E->getDecl() << E->getSourceRange();
10234
10235 return BaseTransform::TransformDeclRefExpr(E);
10236 }
10237
10238 // Exception: filter out member pointer formation
10239 ExprResult TransformUnaryOperator(UnaryOperator *E) {
10240 if (E->getOpcode() == UO_AddrOf && E->getType()->isMemberPointerType())
10241 return E;
10242
10243 return BaseTransform::TransformUnaryOperator(E);
10244 }
10245
Douglas Gregor89625492012-02-09 08:14:43 +000010246 ExprResult TransformLambdaExpr(LambdaExpr *E) {
10247 // Lambdas never need to be transformed.
10248 return E;
10249 }
Eli Friedman456f0182012-01-20 01:26:23 +000010250 };
Eli Friedmanfbc0dff2012-01-18 01:05:54 +000010251}
10252
Benjamin Kramerd81108f2012-11-14 15:08:31 +000010253ExprResult Sema::TransformToPotentiallyEvaluated(Expr *E) {
Eli Friedmane4f22df2012-02-29 04:03:55 +000010254 assert(ExprEvalContexts.back().Context == Unevaluated &&
10255 "Should only transform unevaluated expressions");
Eli Friedman456f0182012-01-20 01:26:23 +000010256 ExprEvalContexts.back().Context =
10257 ExprEvalContexts[ExprEvalContexts.size()-2].Context;
10258 if (ExprEvalContexts.back().Context == Unevaluated)
10259 return E;
10260 return TransformToPE(*this).TransformExpr(E);
Eli Friedmanfbc0dff2012-01-18 01:05:54 +000010261}
10262
Douglas Gregorff790f12009-11-26 00:44:06 +000010263void
Douglas Gregor7fcbd902012-02-21 00:37:24 +000010264Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext,
Richard Smithfd555f62012-02-22 02:04:18 +000010265 Decl *LambdaContextDecl,
10266 bool IsDecltype) {
Douglas Gregorff790f12009-11-26 00:44:06 +000010267 ExprEvalContexts.push_back(
John McCall31168b02011-06-15 23:02:42 +000010268 ExpressionEvaluationContextRecord(NewContext,
John McCall28fc7092011-11-10 05:35:25 +000010269 ExprCleanupObjects.size(),
Douglas Gregor7fcbd902012-02-21 00:37:24 +000010270 ExprNeedsCleanups,
Richard Smithfd555f62012-02-22 02:04:18 +000010271 LambdaContextDecl,
10272 IsDecltype));
John McCall31168b02011-06-15 23:02:42 +000010273 ExprNeedsCleanups = false;
Eli Friedman3bda6b12012-02-02 23:15:15 +000010274 if (!MaybeODRUseExprs.empty())
10275 std::swap(MaybeODRUseExprs, ExprEvalContexts.back().SavedMaybeODRUseExprs);
Douglas Gregor0b6a6242009-06-22 20:57:11 +000010276}
10277
Eli Friedman15681d62012-09-26 04:34:21 +000010278void
10279Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext,
10280 ReuseLambdaContextDecl_t,
10281 bool IsDecltype) {
10282 Decl *LambdaContextDecl = ExprEvalContexts.back().LambdaContextDecl;
10283 PushExpressionEvaluationContext(NewContext, LambdaContextDecl, IsDecltype);
10284}
10285
Richard Trieucfc491d2011-08-02 04:35:43 +000010286void Sema::PopExpressionEvaluationContext() {
Eli Friedmanfa0df832012-02-02 03:46:19 +000010287 ExpressionEvaluationContextRecord& Rec = ExprEvalContexts.back();
Douglas Gregor0b6a6242009-06-22 20:57:11 +000010288
Douglas Gregor89625492012-02-09 08:14:43 +000010289 if (!Rec.Lambdas.empty()) {
10290 if (Rec.Context == Unevaluated) {
10291 // C++11 [expr.prim.lambda]p2:
10292 // A lambda-expression shall not appear in an unevaluated operand
10293 // (Clause 5).
10294 for (unsigned I = 0, N = Rec.Lambdas.size(); I != N; ++I)
10295 Diag(Rec.Lambdas[I]->getLocStart(),
10296 diag::err_lambda_unevaluated_operand);
10297 } else {
10298 // Mark the capture expressions odr-used. This was deferred
10299 // during lambda expression creation.
10300 for (unsigned I = 0, N = Rec.Lambdas.size(); I != N; ++I) {
10301 LambdaExpr *Lambda = Rec.Lambdas[I];
10302 for (LambdaExpr::capture_init_iterator
10303 C = Lambda->capture_init_begin(),
10304 CEnd = Lambda->capture_init_end();
10305 C != CEnd; ++C) {
10306 MarkDeclarationsReferencedInExpr(*C);
10307 }
10308 }
10309 }
10310 }
10311
Douglas Gregorff790f12009-11-26 00:44:06 +000010312 // When are coming out of an unevaluated context, clear out any
10313 // temporaries that we may have created as part of the evaluation of
10314 // the expression in that context: they aren't relevant because they
10315 // will never be constructed.
Richard Smith764d2fe2011-12-20 02:08:33 +000010316 if (Rec.Context == Unevaluated || Rec.Context == ConstantEvaluated) {
John McCall28fc7092011-11-10 05:35:25 +000010317 ExprCleanupObjects.erase(ExprCleanupObjects.begin() + Rec.NumCleanupObjects,
10318 ExprCleanupObjects.end());
John McCall31168b02011-06-15 23:02:42 +000010319 ExprNeedsCleanups = Rec.ParentNeedsCleanups;
Eli Friedman3bda6b12012-02-02 23:15:15 +000010320 CleanupVarDeclMarking();
10321 std::swap(MaybeODRUseExprs, Rec.SavedMaybeODRUseExprs);
John McCall31168b02011-06-15 23:02:42 +000010322 // Otherwise, merge the contexts together.
10323 } else {
10324 ExprNeedsCleanups |= Rec.ParentNeedsCleanups;
Eli Friedman3bda6b12012-02-02 23:15:15 +000010325 MaybeODRUseExprs.insert(Rec.SavedMaybeODRUseExprs.begin(),
10326 Rec.SavedMaybeODRUseExprs.end());
John McCall31168b02011-06-15 23:02:42 +000010327 }
Eli Friedmanfa0df832012-02-02 03:46:19 +000010328
10329 // Pop the current expression evaluation context off the stack.
10330 ExprEvalContexts.pop_back();
Douglas Gregor0b6a6242009-06-22 20:57:11 +000010331}
Douglas Gregorc9c02ed2009-06-19 23:52:42 +000010332
John McCall31168b02011-06-15 23:02:42 +000010333void Sema::DiscardCleanupsInEvaluationContext() {
John McCall28fc7092011-11-10 05:35:25 +000010334 ExprCleanupObjects.erase(
10335 ExprCleanupObjects.begin() + ExprEvalContexts.back().NumCleanupObjects,
10336 ExprCleanupObjects.end());
John McCall31168b02011-06-15 23:02:42 +000010337 ExprNeedsCleanups = false;
Eli Friedman3bda6b12012-02-02 23:15:15 +000010338 MaybeODRUseExprs.clear();
John McCall31168b02011-06-15 23:02:42 +000010339}
10340
Eli Friedmane0afc982012-01-21 01:01:51 +000010341ExprResult Sema::HandleExprEvaluationContextForTypeof(Expr *E) {
10342 if (!E->getType()->isVariablyModifiedType())
10343 return E;
Benjamin Kramerd81108f2012-11-14 15:08:31 +000010344 return TransformToPotentiallyEvaluated(E);
Eli Friedmane0afc982012-01-21 01:01:51 +000010345}
10346
Benjamin Kramerbf8da9d2012-02-06 11:13:08 +000010347static bool IsPotentiallyEvaluatedContext(Sema &SemaRef) {
Douglas Gregorc9c02ed2009-06-19 23:52:42 +000010348 // Do not mark anything as "used" within a dependent context; wait for
10349 // an instantiation.
Eli Friedmanfa0df832012-02-02 03:46:19 +000010350 if (SemaRef.CurContext->isDependentContext())
10351 return false;
Mike Stump11289f42009-09-09 15:08:12 +000010352
Eli Friedmanfa0df832012-02-02 03:46:19 +000010353 switch (SemaRef.ExprEvalContexts.back().Context) {
10354 case Sema::Unevaluated:
Douglas Gregor0b6a6242009-06-22 20:57:11 +000010355 // We are in an expression that is not potentially evaluated; do nothing.
Eli Friedman02b58512012-01-21 04:44:06 +000010356 // (Depending on how you read the standard, we actually do need to do
10357 // something here for null pointer constants, but the standard's
10358 // definition of a null pointer constant is completely crazy.)
Eli Friedmanfa0df832012-02-02 03:46:19 +000010359 return false;
Mike Stump11289f42009-09-09 15:08:12 +000010360
Eli Friedmanfa0df832012-02-02 03:46:19 +000010361 case Sema::ConstantEvaluated:
10362 case Sema::PotentiallyEvaluated:
Eli Friedman02b58512012-01-21 04:44:06 +000010363 // We are in a potentially evaluated expression (or a constant-expression
10364 // in C++03); we need to do implicit template instantiation, implicitly
10365 // define class members, and mark most declarations as used.
Eli Friedmanfa0df832012-02-02 03:46:19 +000010366 return true;
Mike Stump11289f42009-09-09 15:08:12 +000010367
Eli Friedmanfa0df832012-02-02 03:46:19 +000010368 case Sema::PotentiallyEvaluatedIfUsed:
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000010369 // Referenced declarations will only be used if the construct in the
10370 // containing expression is used.
Eli Friedmanfa0df832012-02-02 03:46:19 +000010371 return false;
Douglas Gregor0b6a6242009-06-22 20:57:11 +000010372 }
Matt Beaumont-Gay248bc722012-02-02 18:35:35 +000010373 llvm_unreachable("Invalid context");
Eli Friedmanfa0df832012-02-02 03:46:19 +000010374}
10375
10376/// \brief Mark a function referenced, and check whether it is odr-used
10377/// (C++ [basic.def.odr]p2, C99 6.9p3)
10378void Sema::MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func) {
10379 assert(Func && "No function?");
10380
10381 Func->setReferenced();
10382
Richard Smithe10d3042012-11-07 01:14:25 +000010383 // C++11 [basic.def.odr]p3:
10384 // A function whose name appears as a potentially-evaluated expression is
10385 // odr-used if it is the unique lookup result or the selected member of a
10386 // set of overloaded functions [...].
10387 //
10388 // We (incorrectly) mark overload resolution as an unevaluated context, so we
10389 // can just check that here. Skip the rest of this function if we've already
10390 // marked the function as used.
10391 if (Func->isUsed(false) || !IsPotentiallyEvaluatedContext(*this)) {
10392 // C++11 [temp.inst]p3:
10393 // Unless a function template specialization has been explicitly
10394 // instantiated or explicitly specialized, the function template
10395 // specialization is implicitly instantiated when the specialization is
10396 // referenced in a context that requires a function definition to exist.
10397 //
10398 // We consider constexpr function templates to be referenced in a context
10399 // that requires a definition to exist whenever they are referenced.
10400 //
10401 // FIXME: This instantiates constexpr functions too frequently. If this is
10402 // really an unevaluated context (and we're not just in the definition of a
10403 // function template or overload resolution or other cases which we
10404 // incorrectly consider to be unevaluated contexts), and we're not in a
10405 // subexpression which we actually need to evaluate (for instance, a
10406 // template argument, array bound or an expression in a braced-init-list),
10407 // we are not permitted to instantiate this constexpr function definition.
10408 //
10409 // FIXME: This also implicitly defines special members too frequently. They
10410 // are only supposed to be implicitly defined if they are odr-used, but they
10411 // are not odr-used from constant expressions in unevaluated contexts.
10412 // However, they cannot be referenced if they are deleted, and they are
10413 // deleted whenever the implicit definition of the special member would
10414 // fail.
10415 if (!Func->isConstexpr() || Func->getBody())
10416 return;
10417 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Func);
10418 if (!Func->isImplicitlyInstantiable() && (!MD || MD->isUserProvided()))
10419 return;
10420 }
Mike Stump11289f42009-09-09 15:08:12 +000010421
Douglas Gregorc9c02ed2009-06-19 23:52:42 +000010422 // Note that this declaration has been used.
Eli Friedmanfa0df832012-02-02 03:46:19 +000010423 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Func)) {
Richard Smith273c4e92012-02-26 07:51:39 +000010424 if (Constructor->isDefaulted() && !Constructor->isDeleted()) {
Sebastian Redl22653ba2011-08-30 19:58:05 +000010425 if (Constructor->isDefaultConstructor()) {
10426 if (Constructor->isTrivial())
10427 return;
10428 if (!Constructor->isUsed(false))
10429 DefineImplicitDefaultConstructor(Loc, Constructor);
10430 } else if (Constructor->isCopyConstructor()) {
10431 if (!Constructor->isUsed(false))
10432 DefineImplicitCopyConstructor(Loc, Constructor);
10433 } else if (Constructor->isMoveConstructor()) {
10434 if (!Constructor->isUsed(false))
10435 DefineImplicitMoveConstructor(Loc, Constructor);
10436 }
Fariborz Jahanian477d2422009-06-22 23:34:40 +000010437 }
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +000010438
Douglas Gregor88d292c2010-05-13 16:44:06 +000010439 MarkVTableUsed(Loc, Constructor->getParent());
Eli Friedmanfa0df832012-02-02 03:46:19 +000010440 } else if (CXXDestructorDecl *Destructor =
10441 dyn_cast<CXXDestructorDecl>(Func)) {
Richard Smith273c4e92012-02-26 07:51:39 +000010442 if (Destructor->isDefaulted() && !Destructor->isDeleted() &&
10443 !Destructor->isUsed(false))
Fariborz Jahanian24a175b2009-06-26 23:49:16 +000010444 DefineImplicitDestructor(Loc, Destructor);
Douglas Gregor88d292c2010-05-13 16:44:06 +000010445 if (Destructor->isVirtual())
10446 MarkVTableUsed(Loc, Destructor->getParent());
Eli Friedmanfa0df832012-02-02 03:46:19 +000010447 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(Func)) {
Richard Smith273c4e92012-02-26 07:51:39 +000010448 if (MethodDecl->isDefaulted() && !MethodDecl->isDeleted() &&
10449 MethodDecl->isOverloadedOperator() &&
Fariborz Jahanian41f79272009-06-25 21:45:19 +000010450 MethodDecl->getOverloadedOperator() == OO_Equal) {
Sebastian Redl22653ba2011-08-30 19:58:05 +000010451 if (!MethodDecl->isUsed(false)) {
10452 if (MethodDecl->isCopyAssignmentOperator())
10453 DefineImplicitCopyAssignment(Loc, MethodDecl);
10454 else
10455 DefineImplicitMoveAssignment(Loc, MethodDecl);
10456 }
Douglas Gregord3b672c2012-02-16 01:06:16 +000010457 } else if (isa<CXXConversionDecl>(MethodDecl) &&
10458 MethodDecl->getParent()->isLambda()) {
10459 CXXConversionDecl *Conversion = cast<CXXConversionDecl>(MethodDecl);
10460 if (Conversion->isLambdaToBlockPointerConversion())
10461 DefineImplicitLambdaToBlockPointerConversion(Loc, Conversion);
10462 else
10463 DefineImplicitLambdaToFunctionPointerConversion(Loc, Conversion);
Douglas Gregor88d292c2010-05-13 16:44:06 +000010464 } else if (MethodDecl->isVirtual())
10465 MarkVTableUsed(Loc, MethodDecl->getParent());
Fariborz Jahanian41f79272009-06-25 21:45:19 +000010466 }
John McCall83779672011-02-19 02:53:41 +000010467
Eli Friedmanfa0df832012-02-02 03:46:19 +000010468 // Recursive functions should be marked when used from another function.
10469 // FIXME: Is this really right?
10470 if (CurContext == Func) return;
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +000010471
Richard Smithd3b5c9082012-07-27 04:22:15 +000010472 // Resolve the exception specification for any function which is
Richard Smithf623c962012-04-17 00:58:00 +000010473 // used: CodeGen will need it.
Richard Smithd3729422012-04-19 00:08:28 +000010474 const FunctionProtoType *FPT = Func->getType()->getAs<FunctionProtoType>();
Richard Smithd3b5c9082012-07-27 04:22:15 +000010475 if (FPT && isUnresolvedExceptionSpec(FPT->getExceptionSpecType()))
10476 ResolveExceptionSpec(Loc, FPT);
Richard Smithf623c962012-04-17 00:58:00 +000010477
Eli Friedmanfa0df832012-02-02 03:46:19 +000010478 // Implicit instantiation of function templates and member functions of
10479 // class templates.
10480 if (Func->isImplicitlyInstantiable()) {
10481 bool AlreadyInstantiated = false;
Richard Smith4a941e22012-02-14 22:25:15 +000010482 SourceLocation PointOfInstantiation = Loc;
Eli Friedmanfa0df832012-02-02 03:46:19 +000010483 if (FunctionTemplateSpecializationInfo *SpecInfo
10484 = Func->getTemplateSpecializationInfo()) {
10485 if (SpecInfo->getPointOfInstantiation().isInvalid())
10486 SpecInfo->setPointOfInstantiation(Loc);
10487 else if (SpecInfo->getTemplateSpecializationKind()
Richard Smith4a941e22012-02-14 22:25:15 +000010488 == TSK_ImplicitInstantiation) {
Eli Friedmanfa0df832012-02-02 03:46:19 +000010489 AlreadyInstantiated = true;
Richard Smith4a941e22012-02-14 22:25:15 +000010490 PointOfInstantiation = SpecInfo->getPointOfInstantiation();
10491 }
Eli Friedmanfa0df832012-02-02 03:46:19 +000010492 } else if (MemberSpecializationInfo *MSInfo
10493 = Func->getMemberSpecializationInfo()) {
10494 if (MSInfo->getPointOfInstantiation().isInvalid())
Douglas Gregor06db9f52009-10-12 20:18:28 +000010495 MSInfo->setPointOfInstantiation(Loc);
Eli Friedmanfa0df832012-02-02 03:46:19 +000010496 else if (MSInfo->getTemplateSpecializationKind()
Richard Smith4a941e22012-02-14 22:25:15 +000010497 == TSK_ImplicitInstantiation) {
Eli Friedmanfa0df832012-02-02 03:46:19 +000010498 AlreadyInstantiated = true;
Richard Smith4a941e22012-02-14 22:25:15 +000010499 PointOfInstantiation = MSInfo->getPointOfInstantiation();
10500 }
Douglas Gregor06db9f52009-10-12 20:18:28 +000010501 }
Mike Stump11289f42009-09-09 15:08:12 +000010502
Richard Smith4a941e22012-02-14 22:25:15 +000010503 if (!AlreadyInstantiated || Func->isConstexpr()) {
Eli Friedmanfa0df832012-02-02 03:46:19 +000010504 if (isa<CXXRecordDecl>(Func->getDeclContext()) &&
10505 cast<CXXRecordDecl>(Func->getDeclContext())->isLocalClass())
Richard Smith4a941e22012-02-14 22:25:15 +000010506 PendingLocalImplicitInstantiations.push_back(
10507 std::make_pair(Func, PointOfInstantiation));
10508 else if (Func->isConstexpr())
Eli Friedmanfa0df832012-02-02 03:46:19 +000010509 // Do not defer instantiations of constexpr functions, to avoid the
10510 // expression evaluator needing to call back into Sema if it sees a
10511 // call to such a function.
Richard Smith4a941e22012-02-14 22:25:15 +000010512 InstantiateFunctionDefinition(PointOfInstantiation, Func);
Argyrios Kyrtzidise5dc5b32012-02-10 20:10:44 +000010513 else {
Richard Smith4a941e22012-02-14 22:25:15 +000010514 PendingInstantiations.push_back(std::make_pair(Func,
10515 PointOfInstantiation));
Argyrios Kyrtzidise5dc5b32012-02-10 20:10:44 +000010516 // Notify the consumer that a function was implicitly instantiated.
10517 Consumer.HandleCXXImplicitFunctionInstantiation(Func);
10518 }
John McCall83779672011-02-19 02:53:41 +000010519 }
Eli Friedmanfa0df832012-02-02 03:46:19 +000010520 } else {
10521 // Walk redefinitions, as some of them may be instantiable.
10522 for (FunctionDecl::redecl_iterator i(Func->redecls_begin()),
10523 e(Func->redecls_end()); i != e; ++i) {
10524 if (!i->isUsed(false) && i->isImplicitlyInstantiable())
10525 MarkFunctionReferenced(Loc, *i);
10526 }
Sam Weinigbae69142009-09-11 03:29:30 +000010527 }
Eli Friedmanfa0df832012-02-02 03:46:19 +000010528
10529 // Keep track of used but undefined functions.
Nick Lewycky9c7eb1d2013-02-01 08:13:20 +000010530 if (!Func->isDefined()) {
10531 if (Func->getLinkage() != ExternalLinkage)
10532 UndefinedButUsed.insert(std::make_pair(Func->getCanonicalDecl(), Loc));
10533 else if (Func->getMostRecentDecl()->isInlined() &&
10534 (LangOpts.CPlusPlus || !LangOpts.GNUInline) &&
10535 !Func->getMostRecentDecl()->hasAttr<GNUInlineAttr>())
10536 UndefinedButUsed.insert(std::make_pair(Func->getCanonicalDecl(), Loc));
Eli Friedmanfa0df832012-02-02 03:46:19 +000010537 }
10538
Rafael Espindola820fa702013-01-08 19:43:34 +000010539 // Normally the must current decl is marked used while processing the use and
10540 // any subsequent decls are marked used by decl merging. This fails with
10541 // template instantiation since marking can happen at the end of the file
10542 // and, because of the two phase lookup, this function is called with at
10543 // decl in the middle of a decl chain. We loop to maintain the invariant
10544 // that once a decl is used, all decls after it are also used.
Rafael Espindolaf26d5392013-01-08 19:58:34 +000010545 for (FunctionDecl *F = Func->getMostRecentDecl();; F = F->getPreviousDecl()) {
Rafael Espindola820fa702013-01-08 19:43:34 +000010546 F->setUsed(true);
10547 if (F == Func)
10548 break;
Rafael Espindola820fa702013-01-08 19:43:34 +000010549 }
Eli Friedmanfa0df832012-02-02 03:46:19 +000010550}
10551
Eli Friedman9bb33f52012-02-03 02:04:35 +000010552static void
10553diagnoseUncapturableValueReference(Sema &S, SourceLocation loc,
10554 VarDecl *var, DeclContext *DC) {
Eli Friedmandd053f62012-02-07 00:15:00 +000010555 DeclContext *VarDC = var->getDeclContext();
10556
Eli Friedman9bb33f52012-02-03 02:04:35 +000010557 // If the parameter still belongs to the translation unit, then
10558 // we're actually just using one parameter in the declaration of
10559 // the next.
10560 if (isa<ParmVarDecl>(var) &&
Eli Friedmandd053f62012-02-07 00:15:00 +000010561 isa<TranslationUnitDecl>(VarDC))
Eli Friedman9bb33f52012-02-03 02:04:35 +000010562 return;
10563
Eli Friedmandd053f62012-02-07 00:15:00 +000010564 // For C code, don't diagnose about capture if we're not actually in code
10565 // right now; it's impossible to write a non-constant expression outside of
10566 // function context, so we'll get other (more useful) diagnostics later.
10567 //
10568 // For C++, things get a bit more nasty... it would be nice to suppress this
10569 // diagnostic for certain cases like using a local variable in an array bound
10570 // for a member of a local class, but the correct predicate is not obvious.
David Blaikiebbafb8a2012-03-11 07:00:24 +000010571 if (!S.getLangOpts().CPlusPlus && !S.CurContext->isFunctionOrMethod())
Eli Friedman9bb33f52012-02-03 02:04:35 +000010572 return;
10573
Eli Friedmandd053f62012-02-07 00:15:00 +000010574 if (isa<CXXMethodDecl>(VarDC) &&
10575 cast<CXXRecordDecl>(VarDC->getParent())->isLambda()) {
10576 S.Diag(loc, diag::err_reference_to_local_var_in_enclosing_lambda)
10577 << var->getIdentifier();
10578 } else if (FunctionDecl *fn = dyn_cast<FunctionDecl>(VarDC)) {
10579 S.Diag(loc, diag::err_reference_to_local_var_in_enclosing_function)
10580 << var->getIdentifier() << fn->getDeclName();
10581 } else if (isa<BlockDecl>(VarDC)) {
10582 S.Diag(loc, diag::err_reference_to_local_var_in_enclosing_block)
10583 << var->getIdentifier();
10584 } else {
10585 // FIXME: Is there any other context where a local variable can be
10586 // declared?
10587 S.Diag(loc, diag::err_reference_to_local_var_in_enclosing_context)
10588 << var->getIdentifier();
10589 }
Eli Friedman9bb33f52012-02-03 02:04:35 +000010590
Eli Friedman9bb33f52012-02-03 02:04:35 +000010591 S.Diag(var->getLocation(), diag::note_local_variable_declared_here)
10592 << var->getIdentifier();
Eli Friedmandd053f62012-02-07 00:15:00 +000010593
10594 // FIXME: Add additional diagnostic info about class etc. which prevents
10595 // capture.
Eli Friedman9bb33f52012-02-03 02:04:35 +000010596}
10597
Douglas Gregor81495f32012-02-12 18:42:33 +000010598/// \brief Capture the given variable in the given lambda expression.
10599static ExprResult captureInLambda(Sema &S, LambdaScopeInfo *LSI,
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010600 VarDecl *Var, QualType FieldType,
10601 QualType DeclRefType,
Douglas Gregora8182f92012-05-16 17:01:33 +000010602 SourceLocation Loc,
10603 bool RefersToEnclosingLocal) {
Douglas Gregor81495f32012-02-12 18:42:33 +000010604 CXXRecordDecl *Lambda = LSI->Lambda;
Douglas Gregor81495f32012-02-12 18:42:33 +000010605
Douglas Gregorabecb9c2012-02-09 01:56:40 +000010606 // Build the non-static data member.
10607 FieldDecl *Field
10608 = FieldDecl::Create(S.Context, Lambda, Loc, Loc, 0, FieldType,
10609 S.Context.getTrivialTypeSourceInfo(FieldType, Loc),
Richard Smith2b013182012-06-10 03:12:00 +000010610 0, false, ICIS_NoInit);
Douglas Gregorabecb9c2012-02-09 01:56:40 +000010611 Field->setImplicit(true);
10612 Field->setAccess(AS_private);
Douglas Gregor3d23f7882012-02-09 02:12:34 +000010613 Lambda->addDecl(Field);
Douglas Gregorabecb9c2012-02-09 01:56:40 +000010614
10615 // C++11 [expr.prim.lambda]p21:
10616 // When the lambda-expression is evaluated, the entities that
10617 // are captured by copy are used to direct-initialize each
10618 // corresponding non-static data member of the resulting closure
10619 // object. (For array members, the array elements are
10620 // direct-initialized in increasing subscript order.) These
10621 // initializations are performed in the (unspecified) order in
10622 // which the non-static data members are declared.
Douglas Gregorabecb9c2012-02-09 01:56:40 +000010623
Douglas Gregor89625492012-02-09 08:14:43 +000010624 // Introduce a new evaluation context for the initialization, so
10625 // that temporaries introduced as part of the capture are retained
10626 // to be re-"exported" from the lambda expression itself.
Douglas Gregorabecb9c2012-02-09 01:56:40 +000010627 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated);
10628
Douglas Gregorf02455e2012-02-10 09:26:04 +000010629 // C++ [expr.prim.labda]p12:
10630 // An entity captured by a lambda-expression is odr-used (3.2) in
10631 // the scope containing the lambda-expression.
Douglas Gregora8182f92012-05-16 17:01:33 +000010632 Expr *Ref = new (S.Context) DeclRefExpr(Var, RefersToEnclosingLocal,
10633 DeclRefType, VK_LValue, Loc);
Eli Friedman23b1be92012-03-01 21:32:56 +000010634 Var->setReferenced(true);
Douglas Gregorf02455e2012-02-10 09:26:04 +000010635 Var->setUsed(true);
Douglas Gregor199cec72012-02-09 02:45:47 +000010636
10637 // When the field has array type, create index variables for each
10638 // dimension of the array. We use these index variables to subscript
10639 // the source array, and other clients (e.g., CodeGen) will perform
10640 // the necessary iteration with these index variables.
10641 SmallVector<VarDecl *, 4> IndexVariables;
Douglas Gregor199cec72012-02-09 02:45:47 +000010642 QualType BaseType = FieldType;
10643 QualType SizeType = S.Context.getSizeType();
Douglas Gregor54fcea62012-02-13 16:35:30 +000010644 LSI->ArrayIndexStarts.push_back(LSI->ArrayIndexVars.size());
Douglas Gregor199cec72012-02-09 02:45:47 +000010645 while (const ConstantArrayType *Array
10646 = S.Context.getAsConstantArrayType(BaseType)) {
Douglas Gregor199cec72012-02-09 02:45:47 +000010647 // Create the iteration variable for this array index.
10648 IdentifierInfo *IterationVarName = 0;
10649 {
10650 SmallString<8> Str;
10651 llvm::raw_svector_ostream OS(Str);
10652 OS << "__i" << IndexVariables.size();
10653 IterationVarName = &S.Context.Idents.get(OS.str());
10654 }
10655 VarDecl *IterationVar
10656 = VarDecl::Create(S.Context, S.CurContext, Loc, Loc,
10657 IterationVarName, SizeType,
10658 S.Context.getTrivialTypeSourceInfo(SizeType, Loc),
10659 SC_None, SC_None);
10660 IndexVariables.push_back(IterationVar);
Douglas Gregor54fcea62012-02-13 16:35:30 +000010661 LSI->ArrayIndexVars.push_back(IterationVar);
10662
Douglas Gregor199cec72012-02-09 02:45:47 +000010663 // Create a reference to the iteration variable.
10664 ExprResult IterationVarRef
10665 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc);
10666 assert(!IterationVarRef.isInvalid() &&
10667 "Reference to invented variable cannot fail!");
10668 IterationVarRef = S.DefaultLvalueConversion(IterationVarRef.take());
10669 assert(!IterationVarRef.isInvalid() &&
10670 "Conversion of invented variable cannot fail!");
10671
10672 // Subscript the array with this iteration variable.
10673 ExprResult Subscript = S.CreateBuiltinArraySubscriptExpr(
10674 Ref, Loc, IterationVarRef.take(), Loc);
10675 if (Subscript.isInvalid()) {
10676 S.CleanupVarDeclMarking();
10677 S.DiscardCleanupsInEvaluationContext();
10678 S.PopExpressionEvaluationContext();
10679 return ExprError();
10680 }
10681
10682 Ref = Subscript.take();
10683 BaseType = Array->getElementType();
10684 }
10685
10686 // Construct the entity that we will be initializing. For an array, this
10687 // will be first element in the array, which may require several levels
10688 // of array-subscript entities.
10689 SmallVector<InitializedEntity, 4> Entities;
10690 Entities.reserve(1 + IndexVariables.size());
Douglas Gregor19666fb2012-02-15 16:57:26 +000010691 Entities.push_back(
10692 InitializedEntity::InitializeLambdaCapture(Var, Field, Loc));
Douglas Gregor199cec72012-02-09 02:45:47 +000010693 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I)
10694 Entities.push_back(InitializedEntity::InitializeElement(S.Context,
10695 0,
10696 Entities.back()));
10697
Douglas Gregorabecb9c2012-02-09 01:56:40 +000010698 InitializationKind InitKind
10699 = InitializationKind::CreateDirect(Loc, Loc, Loc);
Douglas Gregor199cec72012-02-09 02:45:47 +000010700 InitializationSequence Init(S, Entities.back(), InitKind, &Ref, 1);
Douglas Gregorabecb9c2012-02-09 01:56:40 +000010701 ExprResult Result(true);
Douglas Gregor199cec72012-02-09 02:45:47 +000010702 if (!Init.Diagnose(S, Entities.back(), InitKind, &Ref, 1))
Benjamin Kramercc4c49d2012-08-23 23:38:35 +000010703 Result = Init.Perform(S, Entities.back(), InitKind, Ref);
Douglas Gregorabecb9c2012-02-09 01:56:40 +000010704
10705 // If this initialization requires any cleanups (e.g., due to a
10706 // default argument to a copy constructor), note that for the
10707 // lambda.
10708 if (S.ExprNeedsCleanups)
10709 LSI->ExprNeedsCleanups = true;
10710
10711 // Exit the expression evaluation context used for the capture.
10712 S.CleanupVarDeclMarking();
10713 S.DiscardCleanupsInEvaluationContext();
10714 S.PopExpressionEvaluationContext();
10715 return Result;
Douglas Gregor199cec72012-02-09 02:45:47 +000010716}
Douglas Gregorabecb9c2012-02-09 01:56:40 +000010717
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010718bool Sema::tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
10719 TryCaptureKind Kind, SourceLocation EllipsisLoc,
10720 bool BuildAndDiagnose,
10721 QualType &CaptureType,
10722 QualType &DeclRefType) {
10723 bool Nested = false;
Douglas Gregor81495f32012-02-12 18:42:33 +000010724
Eli Friedman24af8502012-02-03 22:47:37 +000010725 DeclContext *DC = CurContext;
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010726 if (Var->getDeclContext() == DC) return true;
10727 if (!Var->hasLocalStorage()) return true;
Eli Friedman9bb33f52012-02-03 02:04:35 +000010728
Douglas Gregor81495f32012-02-12 18:42:33 +000010729 bool HasBlocksAttr = Var->hasAttr<BlocksAttr>();
Eli Friedman9bb33f52012-02-03 02:04:35 +000010730
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010731 // Walk up the stack to determine whether we can capture the variable,
10732 // performing the "simple" checks that don't depend on type. We stop when
10733 // we've either hit the declared scope of the variable or find an existing
10734 // capture of that variable.
10735 CaptureType = Var->getType();
10736 DeclRefType = CaptureType.getNonReferenceType();
10737 bool Explicit = (Kind != TryCapture_Implicit);
10738 unsigned FunctionScopesIndex = FunctionScopes.size() - 1;
Eli Friedman9bb33f52012-02-03 02:04:35 +000010739 do {
Eli Friedman24af8502012-02-03 22:47:37 +000010740 // Only block literals and lambda expressions can capture; other
Eli Friedman9bb33f52012-02-03 02:04:35 +000010741 // scopes don't work.
Eli Friedman24af8502012-02-03 22:47:37 +000010742 DeclContext *ParentDC;
10743 if (isa<BlockDecl>(DC))
10744 ParentDC = DC->getParent();
10745 else if (isa<CXXMethodDecl>(DC) &&
Douglas Gregor81495f32012-02-12 18:42:33 +000010746 cast<CXXMethodDecl>(DC)->getOverloadedOperator() == OO_Call &&
Eli Friedman24af8502012-02-03 22:47:37 +000010747 cast<CXXRecordDecl>(DC->getParent())->isLambda())
10748 ParentDC = DC->getParent()->getParent();
Douglas Gregor81495f32012-02-12 18:42:33 +000010749 else {
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010750 if (BuildAndDiagnose)
Douglas Gregor81495f32012-02-12 18:42:33 +000010751 diagnoseUncapturableValueReference(*this, Loc, Var, DC);
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010752 return true;
Douglas Gregor81495f32012-02-12 18:42:33 +000010753 }
Eli Friedman9bb33f52012-02-03 02:04:35 +000010754
Eli Friedman24af8502012-02-03 22:47:37 +000010755 CapturingScopeInfo *CSI =
Douglas Gregor81495f32012-02-12 18:42:33 +000010756 cast<CapturingScopeInfo>(FunctionScopes[FunctionScopesIndex]);
Eli Friedman9bb33f52012-02-03 02:04:35 +000010757
Eli Friedman24af8502012-02-03 22:47:37 +000010758 // Check whether we've already captured it.
Douglas Gregor81495f32012-02-12 18:42:33 +000010759 if (CSI->CaptureMap.count(Var)) {
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010760 // If we found a capture, any subcaptures are nested.
Eli Friedman9bb33f52012-02-03 02:04:35 +000010761 Nested = true;
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010762
10763 // Retrieve the capture type for this variable.
10764 CaptureType = CSI->getCapture(Var).getCaptureType();
10765
10766 // Compute the type of an expression that refers to this variable.
10767 DeclRefType = CaptureType.getNonReferenceType();
10768
10769 const CapturingScopeInfo::Capture &Cap = CSI->getCapture(Var);
10770 if (Cap.isCopyCapture() &&
10771 !(isa<LambdaScopeInfo>(CSI) && cast<LambdaScopeInfo>(CSI)->Mutable))
10772 DeclRefType.addConst();
Eli Friedman9bb33f52012-02-03 02:04:35 +000010773 break;
10774 }
10775
Douglas Gregor81495f32012-02-12 18:42:33 +000010776 bool IsBlock = isa<BlockScopeInfo>(CSI);
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010777 bool IsLambda = !IsBlock;
Eli Friedman24af8502012-02-03 22:47:37 +000010778
10779 // Lambdas are not allowed to capture unnamed variables
10780 // (e.g. anonymous unions).
10781 // FIXME: The C++11 rule don't actually state this explicitly, but I'm
10782 // assuming that's the intent.
Douglas Gregor81495f32012-02-12 18:42:33 +000010783 if (IsLambda && !Var->getDeclName()) {
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010784 if (BuildAndDiagnose) {
Douglas Gregor81495f32012-02-12 18:42:33 +000010785 Diag(Loc, diag::err_lambda_capture_anonymous_var);
10786 Diag(Var->getLocation(), diag::note_declared_at);
10787 }
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010788 return true;
Eli Friedman24af8502012-02-03 22:47:37 +000010789 }
10790
10791 // Prohibit variably-modified types; they're difficult to deal with.
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010792 if (Var->getType()->isVariablyModifiedType()) {
10793 if (BuildAndDiagnose) {
Douglas Gregor81495f32012-02-12 18:42:33 +000010794 if (IsBlock)
10795 Diag(Loc, diag::err_ref_vm_type);
10796 else
10797 Diag(Loc, diag::err_lambda_capture_vm_type) << Var->getDeclName();
10798 Diag(Var->getLocation(), diag::note_previous_decl)
10799 << Var->getDeclName();
10800 }
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010801 return true;
Eli Friedman9bb33f52012-02-03 02:04:35 +000010802 }
Fariborz Jahanian5eae4ad2013-01-08 23:48:48 +000010803 // Prohibit structs with flexible array members too.
Fariborz Jahaniana716a342013-01-08 23:17:51 +000010804 // We cannot capture what is in the tail end of the struct.
10805 if (const RecordType *VTTy = Var->getType()->getAs<RecordType>()) {
Fariborz Jahanian14da4402013-01-09 00:09:15 +000010806 if (VTTy->getDecl()->hasFlexibleArrayMember()) {
Fariborz Jahaniana716a342013-01-08 23:17:51 +000010807 if (BuildAndDiagnose) {
10808 if (IsBlock)
10809 Diag(Loc, diag::err_ref_flexarray_type);
Fariborz Jahanian14da4402013-01-09 00:09:15 +000010810 else
10811 Diag(Loc, diag::err_lambda_capture_flexarray_type)
10812 << Var->getDeclName();
Fariborz Jahaniana716a342013-01-08 23:17:51 +000010813 Diag(Var->getLocation(), diag::note_previous_decl)
10814 << Var->getDeclName();
10815 }
10816 return true;
10817 }
10818 }
Eli Friedman24af8502012-02-03 22:47:37 +000010819 // Lambdas are not allowed to capture __block variables; they don't
10820 // support the expected semantics.
Douglas Gregor81495f32012-02-12 18:42:33 +000010821 if (IsLambda && HasBlocksAttr) {
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010822 if (BuildAndDiagnose) {
Douglas Gregor81495f32012-02-12 18:42:33 +000010823 Diag(Loc, diag::err_lambda_capture_block)
10824 << Var->getDeclName();
10825 Diag(Var->getLocation(), diag::note_previous_decl)
10826 << Var->getDeclName();
10827 }
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010828 return true;
Eli Friedman24af8502012-02-03 22:47:37 +000010829 }
10830
Douglas Gregor81495f32012-02-12 18:42:33 +000010831 if (CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_None && !Explicit) {
10832 // No capture-default
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010833 if (BuildAndDiagnose) {
Douglas Gregor81495f32012-02-12 18:42:33 +000010834 Diag(Loc, diag::err_lambda_impcap) << Var->getDeclName();
10835 Diag(Var->getLocation(), diag::note_previous_decl)
10836 << Var->getDeclName();
10837 Diag(cast<LambdaScopeInfo>(CSI)->Lambda->getLocStart(),
10838 diag::note_lambda_decl);
10839 }
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010840 return true;
Douglas Gregor81495f32012-02-12 18:42:33 +000010841 }
10842
10843 FunctionScopesIndex--;
10844 DC = ParentDC;
10845 Explicit = false;
10846 } while (!Var->getDeclContext()->Equals(DC));
10847
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010848 // Walk back down the scope stack, computing the type of the capture at
10849 // each step, checking type-specific requirements, and adding captures if
10850 // requested.
10851 for (unsigned I = ++FunctionScopesIndex, N = FunctionScopes.size(); I != N;
10852 ++I) {
10853 CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FunctionScopes[I]);
Douglas Gregor812d8f62012-02-18 05:51:20 +000010854
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010855 // Compute the type of the capture and of a reference to the capture within
10856 // this scope.
10857 if (isa<BlockScopeInfo>(CSI)) {
10858 Expr *CopyExpr = 0;
10859 bool ByRef = false;
10860
10861 // Blocks are not allowed to capture arrays.
10862 if (CaptureType->isArrayType()) {
10863 if (BuildAndDiagnose) {
10864 Diag(Loc, diag::err_ref_array_type);
10865 Diag(Var->getLocation(), diag::note_previous_decl)
10866 << Var->getDeclName();
10867 }
10868 return true;
10869 }
10870
John McCall67cd5e02012-03-30 05:23:48 +000010871 // Forbid the block-capture of autoreleasing variables.
10872 if (CaptureType.getObjCLifetime() == Qualifiers::OCL_Autoreleasing) {
10873 if (BuildAndDiagnose) {
10874 Diag(Loc, diag::err_arc_autoreleasing_capture)
10875 << /*block*/ 0;
10876 Diag(Var->getLocation(), diag::note_previous_decl)
10877 << Var->getDeclName();
10878 }
10879 return true;
10880 }
10881
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010882 if (HasBlocksAttr || CaptureType->isReferenceType()) {
10883 // Block capture by reference does not change the capture or
10884 // declaration reference types.
10885 ByRef = true;
10886 } else {
10887 // Block capture by copy introduces 'const'.
10888 CaptureType = CaptureType.getNonReferenceType().withConst();
10889 DeclRefType = CaptureType;
10890
David Blaikiebbafb8a2012-03-11 07:00:24 +000010891 if (getLangOpts().CPlusPlus && BuildAndDiagnose) {
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010892 if (const RecordType *Record = DeclRefType->getAs<RecordType>()) {
10893 // The capture logic needs the destructor, so make sure we mark it.
10894 // Usually this is unnecessary because most local variables have
10895 // their destructors marked at declaration time, but parameters are
10896 // an exception because it's technically only the call site that
10897 // actually requires the destructor.
10898 if (isa<ParmVarDecl>(Var))
10899 FinalizeVarWithDestructor(Var, Record);
Douglas Gregorc4017552012-12-01 01:01:09 +000010900
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010901 // According to the blocks spec, the capture of a variable from
10902 // the stack requires a const copy constructor. This is not true
10903 // of the copy/move done to move a __block variable to the heap.
Douglas Gregorc4017552012-12-01 01:01:09 +000010904 Expr *DeclRef = new (Context) DeclRefExpr(Var, Nested,
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010905 DeclRefType.withConst(),
10906 VK_LValue, Loc);
Douglas Gregorc4017552012-12-01 01:01:09 +000010907
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010908 ExprResult Result
10909 = PerformCopyInitialization(
10910 InitializedEntity::InitializeBlock(Var->getLocation(),
10911 CaptureType, false),
10912 Loc, Owned(DeclRef));
10913
10914 // Build a full-expression copy expression if initialization
10915 // succeeded and used a non-trivial constructor. Recover from
10916 // errors by pretending that the copy isn't necessary.
10917 if (!Result.isInvalid() &&
10918 !cast<CXXConstructExpr>(Result.get())->getConstructor()
10919 ->isTrivial()) {
10920 Result = MaybeCreateExprWithCleanups(Result);
10921 CopyExpr = Result.take();
10922 }
10923 }
10924 }
10925 }
10926
10927 // Actually capture the variable.
10928 if (BuildAndDiagnose)
10929 CSI->addCapture(Var, HasBlocksAttr, ByRef, Nested, Loc,
10930 SourceLocation(), CaptureType, CopyExpr);
10931 Nested = true;
10932 continue;
10933 }
Douglas Gregor812d8f62012-02-18 05:51:20 +000010934
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010935 LambdaScopeInfo *LSI = cast<LambdaScopeInfo>(CSI);
10936
10937 // Determine whether we are capturing by reference or by value.
10938 bool ByRef = false;
10939 if (I == N - 1 && Kind != TryCapture_Implicit) {
10940 ByRef = (Kind == TryCapture_ExplicitByRef);
Eli Friedman24af8502012-02-03 22:47:37 +000010941 } else {
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010942 ByRef = (LSI->ImpCaptureStyle == LambdaScopeInfo::ImpCap_LambdaByref);
Eli Friedman24af8502012-02-03 22:47:37 +000010943 }
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010944
10945 // Compute the type of the field that will capture this variable.
10946 if (ByRef) {
10947 // C++11 [expr.prim.lambda]p15:
10948 // An entity is captured by reference if it is implicitly or
10949 // explicitly captured but not captured by copy. It is
10950 // unspecified whether additional unnamed non-static data
10951 // members are declared in the closure type for entities
10952 // captured by reference.
10953 //
10954 // FIXME: It is not clear whether we want to build an lvalue reference
10955 // to the DeclRefType or to CaptureType.getNonReferenceType(). GCC appears
10956 // to do the former, while EDG does the latter. Core issue 1249 will
10957 // clarify, but for now we follow GCC because it's a more permissive and
10958 // easily defensible position.
10959 CaptureType = Context.getLValueReferenceType(DeclRefType);
10960 } else {
10961 // C++11 [expr.prim.lambda]p14:
10962 // For each entity captured by copy, an unnamed non-static
10963 // data member is declared in the closure type. The
10964 // declaration order of these members is unspecified. The type
10965 // of such a data member is the type of the corresponding
10966 // captured entity if the entity is not a reference to an
10967 // object, or the referenced type otherwise. [Note: If the
10968 // captured entity is a reference to a function, the
10969 // corresponding data member is also a reference to a
10970 // function. - end note ]
10971 if (const ReferenceType *RefType = CaptureType->getAs<ReferenceType>()){
10972 if (!RefType->getPointeeType()->isFunctionType())
10973 CaptureType = RefType->getPointeeType();
Eli Friedman9bb33f52012-02-03 02:04:35 +000010974 }
John McCall67cd5e02012-03-30 05:23:48 +000010975
10976 // Forbid the lambda copy-capture of autoreleasing variables.
10977 if (CaptureType.getObjCLifetime() == Qualifiers::OCL_Autoreleasing) {
10978 if (BuildAndDiagnose) {
10979 Diag(Loc, diag::err_arc_autoreleasing_capture) << /*lambda*/ 1;
10980 Diag(Var->getLocation(), diag::note_previous_decl)
10981 << Var->getDeclName();
10982 }
10983 return true;
10984 }
Eli Friedman9bb33f52012-02-03 02:04:35 +000010985 }
10986
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010987 // Capture this variable in the lambda.
10988 Expr *CopyExpr = 0;
10989 if (BuildAndDiagnose) {
10990 ExprResult Result = captureInLambda(*this, LSI, Var, CaptureType,
Douglas Gregora8182f92012-05-16 17:01:33 +000010991 DeclRefType, Loc,
Douglas Gregorc4017552012-12-01 01:01:09 +000010992 Nested);
Douglas Gregorfdf598e2012-02-18 09:37:24 +000010993 if (!Result.isInvalid())
10994 CopyExpr = Result.take();
10995 }
10996
10997 // Compute the type of a reference to this captured variable.
10998 if (ByRef)
10999 DeclRefType = CaptureType.getNonReferenceType();
11000 else {
11001 // C++ [expr.prim.lambda]p5:
11002 // The closure type for a lambda-expression has a public inline
11003 // function call operator [...]. This function call operator is
11004 // declared const (9.3.1) if and only if the lambda-expression’s
11005 // parameter-declaration-clause is not followed by mutable.
11006 DeclRefType = CaptureType.getNonReferenceType();
11007 if (!LSI->Mutable && !CaptureType->isReferenceType())
11008 DeclRefType.addConst();
11009 }
11010
11011 // Add the capture.
11012 if (BuildAndDiagnose)
11013 CSI->addCapture(Var, /*IsBlock=*/false, ByRef, Nested, Loc,
11014 EllipsisLoc, CaptureType, CopyExpr);
Eli Friedman9bb33f52012-02-03 02:04:35 +000011015 Nested = true;
11016 }
Douglas Gregorfdf598e2012-02-18 09:37:24 +000011017
11018 return false;
11019}
11020
11021bool Sema::tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
11022 TryCaptureKind Kind, SourceLocation EllipsisLoc) {
11023 QualType CaptureType;
11024 QualType DeclRefType;
11025 return tryCaptureVariable(Var, Loc, Kind, EllipsisLoc,
11026 /*BuildAndDiagnose=*/true, CaptureType,
11027 DeclRefType);
11028}
11029
11030QualType Sema::getCapturedDeclRefType(VarDecl *Var, SourceLocation Loc) {
11031 QualType CaptureType;
11032 QualType DeclRefType;
11033
11034 // Determine whether we can capture this variable.
11035 if (tryCaptureVariable(Var, Loc, TryCapture_Implicit, SourceLocation(),
11036 /*BuildAndDiagnose=*/false, CaptureType, DeclRefType))
11037 return QualType();
11038
11039 return DeclRefType;
Eli Friedman9bb33f52012-02-03 02:04:35 +000011040}
11041
Eli Friedman3bda6b12012-02-02 23:15:15 +000011042static void MarkVarDeclODRUsed(Sema &SemaRef, VarDecl *Var,
11043 SourceLocation Loc) {
11044 // Keep track of used but undefined variables.
Eli Friedman130bbd02012-02-04 00:54:05 +000011045 // FIXME: We shouldn't suppress this warning for static data members.
Daniel Dunbar9d355812012-03-09 01:51:51 +000011046 if (Var->hasDefinition(SemaRef.Context) == VarDecl::DeclarationOnly &&
Eli Friedman130bbd02012-02-04 00:54:05 +000011047 Var->getLinkage() != ExternalLinkage &&
11048 !(Var->isStaticDataMember() && Var->hasInit())) {
Nick Lewycky9c7eb1d2013-02-01 08:13:20 +000011049 SourceLocation &old = SemaRef.UndefinedButUsed[Var->getCanonicalDecl()];
Eli Friedman3bda6b12012-02-02 23:15:15 +000011050 if (old.isInvalid()) old = Loc;
11051 }
11052
Douglas Gregorfdf598e2012-02-18 09:37:24 +000011053 SemaRef.tryCaptureVariable(Var, Loc);
Eli Friedman9bb33f52012-02-03 02:04:35 +000011054
Eli Friedman3bda6b12012-02-02 23:15:15 +000011055 Var->setUsed(true);
11056}
11057
11058void Sema::UpdateMarkingForLValueToRValue(Expr *E) {
11059 // Per C++11 [basic.def.odr], a variable is odr-used "unless it is
11060 // an object that satisfies the requirements for appearing in a
11061 // constant expression (5.19) and the lvalue-to-rvalue conversion (4.1)
11062 // is immediately applied." This function handles the lvalue-to-rvalue
11063 // conversion part.
11064 MaybeODRUseExprs.erase(E->IgnoreParens());
11065}
11066
Eli Friedmanc6237c62012-02-29 03:16:56 +000011067ExprResult Sema::ActOnConstantExpression(ExprResult Res) {
11068 if (!Res.isUsable())
11069 return Res;
11070
11071 // If a constant-expression is a reference to a variable where we delay
11072 // deciding whether it is an odr-use, just assume we will apply the
11073 // lvalue-to-rvalue conversion. In the one case where this doesn't happen
11074 // (a non-type template argument), we have special handling anyway.
11075 UpdateMarkingForLValueToRValue(Res.get());
11076 return Res;
11077}
11078
Eli Friedman3bda6b12012-02-02 23:15:15 +000011079void Sema::CleanupVarDeclMarking() {
11080 for (llvm::SmallPtrSetIterator<Expr*> i = MaybeODRUseExprs.begin(),
11081 e = MaybeODRUseExprs.end();
11082 i != e; ++i) {
11083 VarDecl *Var;
11084 SourceLocation Loc;
John McCall113bee02012-03-10 09:33:50 +000011085 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(*i)) {
Eli Friedman3bda6b12012-02-02 23:15:15 +000011086 Var = cast<VarDecl>(DRE->getDecl());
11087 Loc = DRE->getLocation();
11088 } else if (MemberExpr *ME = dyn_cast<MemberExpr>(*i)) {
11089 Var = cast<VarDecl>(ME->getMemberDecl());
11090 Loc = ME->getMemberLoc();
11091 } else {
11092 llvm_unreachable("Unexpcted expression");
11093 }
11094
11095 MarkVarDeclODRUsed(*this, Var, Loc);
11096 }
11097
11098 MaybeODRUseExprs.clear();
11099}
11100
11101// Mark a VarDecl referenced, and perform the necessary handling to compute
11102// odr-uses.
11103static void DoMarkVarDeclReferenced(Sema &SemaRef, SourceLocation Loc,
11104 VarDecl *Var, Expr *E) {
Eli Friedmanfa0df832012-02-02 03:46:19 +000011105 Var->setReferenced();
11106
Eli Friedman3bda6b12012-02-02 23:15:15 +000011107 if (!IsPotentiallyEvaluatedContext(SemaRef))
Eli Friedmanfa0df832012-02-02 03:46:19 +000011108 return;
11109
11110 // Implicit instantiation of static data members of class templates.
Richard Smithd3cf2382012-02-15 02:42:50 +000011111 if (Var->isStaticDataMember() && Var->getInstantiatedFromStaticDataMember()) {
Eli Friedmanfa0df832012-02-02 03:46:19 +000011112 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo();
11113 assert(MSInfo && "Missing member specialization information?");
Richard Smithd3cf2382012-02-15 02:42:50 +000011114 bool AlreadyInstantiated = !MSInfo->getPointOfInstantiation().isInvalid();
11115 if (MSInfo->getTemplateSpecializationKind() == TSK_ImplicitInstantiation &&
Daniel Dunbar9d355812012-03-09 01:51:51 +000011116 (!AlreadyInstantiated ||
11117 Var->isUsableInConstantExpressions(SemaRef.Context))) {
Richard Smithd3cf2382012-02-15 02:42:50 +000011118 if (!AlreadyInstantiated) {
11119 // This is a modification of an existing AST node. Notify listeners.
11120 if (ASTMutationListener *L = SemaRef.getASTMutationListener())
11121 L->StaticDataMemberInstantiated(Var);
11122 MSInfo->setPointOfInstantiation(Loc);
11123 }
11124 SourceLocation PointOfInstantiation = MSInfo->getPointOfInstantiation();
Daniel Dunbar9d355812012-03-09 01:51:51 +000011125 if (Var->isUsableInConstantExpressions(SemaRef.Context))
Eli Friedmanfa0df832012-02-02 03:46:19 +000011126 // Do not defer instantiations of variables which could be used in a
11127 // constant expression.
Richard Smithd3cf2382012-02-15 02:42:50 +000011128 SemaRef.InstantiateStaticDataMemberDefinition(PointOfInstantiation,Var);
Eli Friedmanfa0df832012-02-02 03:46:19 +000011129 else
Richard Smithd3cf2382012-02-15 02:42:50 +000011130 SemaRef.PendingInstantiations.push_back(
11131 std::make_pair(Var, PointOfInstantiation));
Eli Friedmanfa0df832012-02-02 03:46:19 +000011132 }
11133 }
11134
Richard Smith5a1104b2012-10-20 01:38:33 +000011135 // Per C++11 [basic.def.odr], a variable is odr-used "unless it satisfies
11136 // the requirements for appearing in a constant expression (5.19) and, if
11137 // it is an object, the lvalue-to-rvalue conversion (4.1)
Eli Friedman3bda6b12012-02-02 23:15:15 +000011138 // is immediately applied." We check the first part here, and
11139 // Sema::UpdateMarkingForLValueToRValue deals with the second part.
11140 // Note that we use the C++11 definition everywhere because nothing in
Richard Smith5a1104b2012-10-20 01:38:33 +000011141 // C++03 depends on whether we get the C++03 version correct. The second
11142 // part does not apply to references, since they are not objects.
Eli Friedman3bda6b12012-02-02 23:15:15 +000011143 const VarDecl *DefVD;
Richard Smith5a1104b2012-10-20 01:38:33 +000011144 if (E && !isa<ParmVarDecl>(Var) &&
Daniel Dunbar9d355812012-03-09 01:51:51 +000011145 Var->isUsableInConstantExpressions(SemaRef.Context) &&
Richard Smith5a1104b2012-10-20 01:38:33 +000011146 Var->getAnyInitializer(DefVD) && DefVD->checkInitIsICE()) {
11147 if (!Var->getType()->isReferenceType())
11148 SemaRef.MaybeODRUseExprs.insert(E);
11149 } else
Eli Friedman3bda6b12012-02-02 23:15:15 +000011150 MarkVarDeclODRUsed(SemaRef, Var, Loc);
11151}
Eli Friedmanfa0df832012-02-02 03:46:19 +000011152
Eli Friedman3bda6b12012-02-02 23:15:15 +000011153/// \brief Mark a variable referenced, and check whether it is odr-used
11154/// (C++ [basic.def.odr]p2, C99 6.9p3). Note that this should not be
11155/// used directly for normal expressions referring to VarDecl.
11156void Sema::MarkVariableReferenced(SourceLocation Loc, VarDecl *Var) {
11157 DoMarkVarDeclReferenced(*this, Loc, Var, 0);
Eli Friedmanfa0df832012-02-02 03:46:19 +000011158}
11159
11160static void MarkExprReferenced(Sema &SemaRef, SourceLocation Loc,
Nick Lewycky45b50522013-02-02 00:25:55 +000011161 Decl *D, Expr *E, bool OdrUse) {
Eli Friedman3bda6b12012-02-02 23:15:15 +000011162 if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
11163 DoMarkVarDeclReferenced(SemaRef, Loc, Var, E);
11164 return;
11165 }
11166
Nick Lewycky45b50522013-02-02 00:25:55 +000011167 SemaRef.MarkAnyDeclReferenced(Loc, D, OdrUse);
Rafael Espindola49e860b2012-06-26 17:45:31 +000011168
11169 // If this is a call to a method via a cast, also mark the method in the
11170 // derived class used in case codegen can devirtualize the call.
11171 const MemberExpr *ME = dyn_cast<MemberExpr>(E);
11172 if (!ME)
11173 return;
11174 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ME->getMemberDecl());
11175 if (!MD)
11176 return;
11177 const Expr *Base = ME->getBase();
Rafael Espindolab7f5a9c2012-06-27 18:18:05 +000011178 const CXXRecordDecl *MostDerivedClassDecl = Base->getBestDynamicClassType();
Rafael Espindola49e860b2012-06-26 17:45:31 +000011179 if (!MostDerivedClassDecl)
11180 return;
11181 CXXMethodDecl *DM = MD->getCorrespondingMethodInClass(MostDerivedClassDecl);
Nick Lewyckyb7444cd2013-02-14 00:55:17 +000011182 if (!DM || DM->isPure())
Rafael Espindolaa245edc2012-06-27 17:44:39 +000011183 return;
Nick Lewycky45b50522013-02-02 00:25:55 +000011184 SemaRef.MarkAnyDeclReferenced(Loc, DM, OdrUse);
Douglas Gregord3b672c2012-02-16 01:06:16 +000011185}
Eli Friedmanfa0df832012-02-02 03:46:19 +000011186
Eli Friedmanfa0df832012-02-02 03:46:19 +000011187/// \brief Perform reference-marking and odr-use handling for a DeclRefExpr.
11188void Sema::MarkDeclRefReferenced(DeclRefExpr *E) {
Nick Lewycky45b50522013-02-02 00:25:55 +000011189 // TODO: update this with DR# once a defect report is filed.
11190 // C++11 defect. The address of a pure member should not be an ODR use, even
11191 // if it's a qualified reference.
11192 bool OdrUse = true;
11193 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(E->getDecl()))
Nick Lewycky192542c2013-02-05 06:20:31 +000011194 if (Method->isVirtual())
Nick Lewycky45b50522013-02-02 00:25:55 +000011195 OdrUse = false;
11196 MarkExprReferenced(*this, E->getLocation(), E->getDecl(), E, OdrUse);
Eli Friedmanfa0df832012-02-02 03:46:19 +000011197}
11198
11199/// \brief Perform reference-marking and odr-use handling for a MemberExpr.
11200void Sema::MarkMemberReferenced(MemberExpr *E) {
Nick Lewycky60bd4be2013-01-31 03:15:20 +000011201 // C++11 [basic.def.odr]p2:
Nick Lewycky35d23592013-01-31 01:34:31 +000011202 // A non-overloaded function whose name appears as a potentially-evaluated
11203 // expression or a member of a set of candidate functions, if selected by
11204 // overload resolution when referred to from a potentially-evaluated
11205 // expression, is odr-used, unless it is a pure virtual function and its
11206 // name is not explicitly qualified.
Nick Lewycky45b50522013-02-02 00:25:55 +000011207 bool OdrUse = true;
Nick Lewycky35d23592013-01-31 01:34:31 +000011208 if (!E->hasQualifier()) {
11209 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(E->getMemberDecl()))
11210 if (Method->isPure())
Nick Lewycky45b50522013-02-02 00:25:55 +000011211 OdrUse = false;
Nick Lewycky35d23592013-01-31 01:34:31 +000011212 }
Nick Lewyckya096b142013-02-12 08:08:54 +000011213 SourceLocation Loc = E->getMemberLoc().isValid() ?
11214 E->getMemberLoc() : E->getLocStart();
11215 MarkExprReferenced(*this, Loc, E->getMemberDecl(), E, OdrUse);
Eli Friedmanfa0df832012-02-02 03:46:19 +000011216}
11217
Douglas Gregorf02455e2012-02-10 09:26:04 +000011218/// \brief Perform marking for a reference to an arbitrary declaration. It
Eli Friedmanfa0df832012-02-02 03:46:19 +000011219/// marks the declaration referenced, and performs odr-use checking for functions
11220/// and variables. This method should not be used when building an normal
11221/// expression which refers to a variable.
Nick Lewycky45b50522013-02-02 00:25:55 +000011222void Sema::MarkAnyDeclReferenced(SourceLocation Loc, Decl *D, bool OdrUse) {
11223 if (OdrUse) {
11224 if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
11225 MarkVariableReferenced(Loc, VD);
11226 return;
11227 }
11228 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
11229 MarkFunctionReferenced(Loc, FD);
11230 return;
11231 }
11232 }
11233 D->setReferenced();
Douglas Gregorc9c02ed2009-06-19 23:52:42 +000011234}
Anders Carlsson7f84ed92009-10-09 23:51:55 +000011235
Douglas Gregor5597ab42010-05-07 23:12:07 +000011236namespace {
Chandler Carruthaf80f662010-06-09 08:17:30 +000011237 // Mark all of the declarations referenced
Douglas Gregor5597ab42010-05-07 23:12:07 +000011238 // FIXME: Not fully implemented yet! We need to have a better understanding
Chandler Carruthaf80f662010-06-09 08:17:30 +000011239 // of when we're entering
Douglas Gregor5597ab42010-05-07 23:12:07 +000011240 class MarkReferencedDecls : public RecursiveASTVisitor<MarkReferencedDecls> {
11241 Sema &S;
11242 SourceLocation Loc;
Chandler Carruthaf80f662010-06-09 08:17:30 +000011243
Douglas Gregor5597ab42010-05-07 23:12:07 +000011244 public:
11245 typedef RecursiveASTVisitor<MarkReferencedDecls> Inherited;
Chandler Carruthaf80f662010-06-09 08:17:30 +000011246
Douglas Gregor5597ab42010-05-07 23:12:07 +000011247 MarkReferencedDecls(Sema &S, SourceLocation Loc) : S(S), Loc(Loc) { }
Chandler Carruthaf80f662010-06-09 08:17:30 +000011248
11249 bool TraverseTemplateArgument(const TemplateArgument &Arg);
11250 bool TraverseRecordType(RecordType *T);
Douglas Gregor5597ab42010-05-07 23:12:07 +000011251 };
11252}
11253
Chandler Carruthaf80f662010-06-09 08:17:30 +000011254bool MarkReferencedDecls::TraverseTemplateArgument(
11255 const TemplateArgument &Arg) {
Douglas Gregor5597ab42010-05-07 23:12:07 +000011256 if (Arg.getKind() == TemplateArgument::Declaration) {
Douglas Gregor31f55dc2012-04-06 22:40:38 +000011257 if (Decl *D = Arg.getAsDecl())
Nick Lewycky45b50522013-02-02 00:25:55 +000011258 S.MarkAnyDeclReferenced(Loc, D, true);
Douglas Gregor5597ab42010-05-07 23:12:07 +000011259 }
Chandler Carruthaf80f662010-06-09 08:17:30 +000011260
11261 return Inherited::TraverseTemplateArgument(Arg);
Douglas Gregor5597ab42010-05-07 23:12:07 +000011262}
11263
Chandler Carruthaf80f662010-06-09 08:17:30 +000011264bool MarkReferencedDecls::TraverseRecordType(RecordType *T) {
Douglas Gregor5597ab42010-05-07 23:12:07 +000011265 if (ClassTemplateSpecializationDecl *Spec
11266 = dyn_cast<ClassTemplateSpecializationDecl>(T->getDecl())) {
11267 const TemplateArgumentList &Args = Spec->getTemplateArgs();
Douglas Gregor1ccc8412010-11-07 23:05:16 +000011268 return TraverseTemplateArguments(Args.data(), Args.size());
Douglas Gregor5597ab42010-05-07 23:12:07 +000011269 }
11270
Chandler Carruthc65667c2010-06-10 10:31:57 +000011271 return true;
Douglas Gregor5597ab42010-05-07 23:12:07 +000011272}
11273
11274void Sema::MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T) {
11275 MarkReferencedDecls Marker(*this, Loc);
Chandler Carruthaf80f662010-06-09 08:17:30 +000011276 Marker.TraverseType(Context.getCanonicalType(T));
Douglas Gregor5597ab42010-05-07 23:12:07 +000011277}
11278
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000011279namespace {
11280 /// \brief Helper class that marks all of the declarations referenced by
11281 /// potentially-evaluated subexpressions as "referenced".
11282 class EvaluatedExprMarker : public EvaluatedExprVisitor<EvaluatedExprMarker> {
11283 Sema &S;
Douglas Gregor680e9e02012-02-21 19:11:17 +000011284 bool SkipLocalVariables;
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000011285
11286 public:
11287 typedef EvaluatedExprVisitor<EvaluatedExprMarker> Inherited;
11288
Douglas Gregor680e9e02012-02-21 19:11:17 +000011289 EvaluatedExprMarker(Sema &S, bool SkipLocalVariables)
11290 : Inherited(S.Context), S(S), SkipLocalVariables(SkipLocalVariables) { }
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000011291
11292 void VisitDeclRefExpr(DeclRefExpr *E) {
Douglas Gregor680e9e02012-02-21 19:11:17 +000011293 // If we were asked not to visit local variables, don't.
11294 if (SkipLocalVariables) {
11295 if (VarDecl *VD = dyn_cast<VarDecl>(E->getDecl()))
11296 if (VD->hasLocalStorage())
11297 return;
11298 }
11299
Eli Friedmanfa0df832012-02-02 03:46:19 +000011300 S.MarkDeclRefReferenced(E);
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000011301 }
11302
11303 void VisitMemberExpr(MemberExpr *E) {
Eli Friedmanfa0df832012-02-02 03:46:19 +000011304 S.MarkMemberReferenced(E);
Douglas Gregor32b3de52010-09-11 23:32:50 +000011305 Inherited::VisitMemberExpr(E);
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000011306 }
11307
John McCall28fc7092011-11-10 05:35:25 +000011308 void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
Eli Friedmanfa0df832012-02-02 03:46:19 +000011309 S.MarkFunctionReferenced(E->getLocStart(),
John McCall28fc7092011-11-10 05:35:25 +000011310 const_cast<CXXDestructorDecl*>(E->getTemporary()->getDestructor()));
11311 Visit(E->getSubExpr());
11312 }
11313
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000011314 void VisitCXXNewExpr(CXXNewExpr *E) {
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000011315 if (E->getOperatorNew())
Eli Friedmanfa0df832012-02-02 03:46:19 +000011316 S.MarkFunctionReferenced(E->getLocStart(), E->getOperatorNew());
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000011317 if (E->getOperatorDelete())
Eli Friedmanfa0df832012-02-02 03:46:19 +000011318 S.MarkFunctionReferenced(E->getLocStart(), E->getOperatorDelete());
Douglas Gregor32b3de52010-09-11 23:32:50 +000011319 Inherited::VisitCXXNewExpr(E);
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000011320 }
Sebastian Redl6047f072012-02-16 12:22:20 +000011321
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000011322 void VisitCXXDeleteExpr(CXXDeleteExpr *E) {
11323 if (E->getOperatorDelete())
Eli Friedmanfa0df832012-02-02 03:46:19 +000011324 S.MarkFunctionReferenced(E->getLocStart(), E->getOperatorDelete());
Douglas Gregor6ed2fee2010-09-14 22:55:20 +000011325 QualType Destroyed = S.Context.getBaseElementType(E->getDestroyedType());
11326 if (const RecordType *DestroyedRec = Destroyed->getAs<RecordType>()) {
11327 CXXRecordDecl *Record = cast<CXXRecordDecl>(DestroyedRec->getDecl());
Eli Friedmanfa0df832012-02-02 03:46:19 +000011328 S.MarkFunctionReferenced(E->getLocStart(),
Douglas Gregor6ed2fee2010-09-14 22:55:20 +000011329 S.LookupDestructor(Record));
11330 }
11331
Douglas Gregor32b3de52010-09-11 23:32:50 +000011332 Inherited::VisitCXXDeleteExpr(E);
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000011333 }
11334
11335 void VisitCXXConstructExpr(CXXConstructExpr *E) {
Eli Friedmanfa0df832012-02-02 03:46:19 +000011336 S.MarkFunctionReferenced(E->getLocStart(), E->getConstructor());
Douglas Gregor32b3de52010-09-11 23:32:50 +000011337 Inherited::VisitCXXConstructExpr(E);
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000011338 }
11339
Douglas Gregorf0873f42010-10-19 17:17:35 +000011340 void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
11341 Visit(E->getExpr());
11342 }
Eli Friedman3bda6b12012-02-02 23:15:15 +000011343
11344 void VisitImplicitCastExpr(ImplicitCastExpr *E) {
11345 Inherited::VisitImplicitCastExpr(E);
11346
11347 if (E->getCastKind() == CK_LValueToRValue)
11348 S.UpdateMarkingForLValueToRValue(E->getSubExpr());
11349 }
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000011350 };
11351}
11352
11353/// \brief Mark any declarations that appear within this expression or any
11354/// potentially-evaluated subexpressions as "referenced".
Douglas Gregor680e9e02012-02-21 19:11:17 +000011355///
11356/// \param SkipLocalVariables If true, don't mark local variables as
11357/// 'referenced'.
11358void Sema::MarkDeclarationsReferencedInExpr(Expr *E,
11359 bool SkipLocalVariables) {
11360 EvaluatedExprMarker(*this, SkipLocalVariables).Visit(E);
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000011361}
11362
Douglas Gregorda8cdbc2009-12-22 01:01:55 +000011363/// \brief Emit a diagnostic that describes an effect on the run-time behavior
11364/// of the program being compiled.
11365///
11366/// This routine emits the given diagnostic when the code currently being
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +000011367/// type-checked is "potentially evaluated", meaning that there is a
Douglas Gregorda8cdbc2009-12-22 01:01:55 +000011368/// possibility that the code will actually be executable. Code in sizeof()
11369/// expressions, code used only during overload resolution, etc., are not
11370/// potentially evaluated. This routine will suppress such diagnostics or,
11371/// in the absolutely nutty case of potentially potentially evaluated
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +000011372/// expressions (C++ typeid), queue the diagnostic to potentially emit it
Douglas Gregorda8cdbc2009-12-22 01:01:55 +000011373/// later.
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +000011374///
Douglas Gregorda8cdbc2009-12-22 01:01:55 +000011375/// This routine should be used for all diagnostics that describe the run-time
11376/// behavior of a program, such as passing a non-POD value through an ellipsis.
11377/// Failure to do so will likely result in spurious diagnostics or failures
11378/// during overload resolution or within sizeof/alignof/typeof/typeid.
Richard Trieuba63ce62011-09-09 01:45:06 +000011379bool Sema::DiagRuntimeBehavior(SourceLocation Loc, const Stmt *Statement,
Douglas Gregorda8cdbc2009-12-22 01:01:55 +000011380 const PartialDiagnostic &PD) {
John McCall31168b02011-06-15 23:02:42 +000011381 switch (ExprEvalContexts.back().Context) {
Douglas Gregorda8cdbc2009-12-22 01:01:55 +000011382 case Unevaluated:
11383 // The argument will never be evaluated, so don't complain.
11384 break;
Kovarththanan Rajaratnamba2c6522010-03-13 10:17:05 +000011385
Richard Smith764d2fe2011-12-20 02:08:33 +000011386 case ConstantEvaluated:
11387 // Relevant diagnostics should be produced by constant evaluation.
11388 break;
11389
Douglas Gregorda8cdbc2009-12-22 01:01:55 +000011390 case PotentiallyEvaluated:
Douglas Gregor8a01b2a2010-09-11 20:24:53 +000011391 case PotentiallyEvaluatedIfUsed:
Richard Trieuba63ce62011-09-09 01:45:06 +000011392 if (Statement && getCurFunctionOrMethodDecl()) {
Ted Kremenek3427fac2011-02-23 01:52:04 +000011393 FunctionScopes.back()->PossiblyUnreachableDiags.
Richard Trieuba63ce62011-09-09 01:45:06 +000011394 push_back(sema::PossiblyUnreachableDiag(PD, Loc, Statement));
Ted Kremenek3427fac2011-02-23 01:52:04 +000011395 }
11396 else
11397 Diag(Loc, PD);
11398
Douglas Gregorda8cdbc2009-12-22 01:01:55 +000011399 return true;
Douglas Gregorda8cdbc2009-12-22 01:01:55 +000011400 }
11401
11402 return false;
11403}
11404
Anders Carlsson7f84ed92009-10-09 23:51:55 +000011405bool Sema::CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
11406 CallExpr *CE, FunctionDecl *FD) {
11407 if (ReturnType->isVoidType() || !ReturnType->isIncompleteType())
11408 return false;
11409
Richard Smithfd555f62012-02-22 02:04:18 +000011410 // If we're inside a decltype's expression, don't check for a valid return
11411 // type or construct temporaries until we know whether this is the last call.
11412 if (ExprEvalContexts.back().IsDecltype) {
11413 ExprEvalContexts.back().DelayedDecltypeCalls.push_back(CE);
11414 return false;
11415 }
11416
Douglas Gregora6c5abb2012-05-04 16:48:41 +000011417 class CallReturnIncompleteDiagnoser : public TypeDiagnoser {
Douglas Gregor7bfb2d02012-05-04 16:32:21 +000011418 FunctionDecl *FD;
11419 CallExpr *CE;
11420
11421 public:
11422 CallReturnIncompleteDiagnoser(FunctionDecl *FD, CallExpr *CE)
11423 : FD(FD), CE(CE) { }
11424
11425 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) {
11426 if (!FD) {
11427 S.Diag(Loc, diag::err_call_incomplete_return)
11428 << T << CE->getSourceRange();
11429 return;
11430 }
11431
11432 S.Diag(Loc, diag::err_call_function_incomplete_return)
11433 << CE->getSourceRange() << FD->getDeclName() << T;
11434 S.Diag(FD->getLocation(),
11435 diag::note_function_with_incomplete_return_type_declared_here)
11436 << FD->getDeclName();
11437 }
11438 } Diagnoser(FD, CE);
11439
11440 if (RequireCompleteType(Loc, ReturnType, Diagnoser))
Anders Carlsson7f84ed92009-10-09 23:51:55 +000011441 return true;
11442
11443 return false;
11444}
11445
Douglas Gregor2d4f64f2011-01-19 16:50:08 +000011446// Diagnose the s/=/==/ and s/\|=/!=/ typos. Note that adding parentheses
John McCalld5707ab2009-10-12 21:59:07 +000011447// will prevent this condition from triggering, which is what we want.
11448void Sema::DiagnoseAssignmentAsCondition(Expr *E) {
11449 SourceLocation Loc;
11450
John McCall0506e4a2009-11-11 02:41:58 +000011451 unsigned diagnostic = diag::warn_condition_is_assignment;
Douglas Gregor2d4f64f2011-01-19 16:50:08 +000011452 bool IsOrAssign = false;
John McCall0506e4a2009-11-11 02:41:58 +000011453
Chandler Carruthf87d6c02011-08-16 22:30:10 +000011454 if (BinaryOperator *Op = dyn_cast<BinaryOperator>(E)) {
Douglas Gregor2d4f64f2011-01-19 16:50:08 +000011455 if (Op->getOpcode() != BO_Assign && Op->getOpcode() != BO_OrAssign)
John McCalld5707ab2009-10-12 21:59:07 +000011456 return;
11457
Douglas Gregor2d4f64f2011-01-19 16:50:08 +000011458 IsOrAssign = Op->getOpcode() == BO_OrAssign;
11459
John McCallb0e419e2009-11-12 00:06:05 +000011460 // Greylist some idioms by putting them into a warning subcategory.
11461 if (ObjCMessageExpr *ME
11462 = dyn_cast<ObjCMessageExpr>(Op->getRHS()->IgnoreParenCasts())) {
11463 Selector Sel = ME->getSelector();
11464
John McCallb0e419e2009-11-12 00:06:05 +000011465 // self = [<foo> init...]
Douglas Gregor486b74e2011-09-27 16:10:05 +000011466 if (isSelfExpr(Op->getLHS()) && Sel.getNameForSlot(0).startswith("init"))
John McCallb0e419e2009-11-12 00:06:05 +000011467 diagnostic = diag::warn_condition_is_idiomatic_assignment;
11468
11469 // <foo> = [<bar> nextObject]
Douglas Gregoraf2a6ae2011-02-18 22:29:55 +000011470 else if (Sel.isUnarySelector() && Sel.getNameForSlot(0) == "nextObject")
John McCallb0e419e2009-11-12 00:06:05 +000011471 diagnostic = diag::warn_condition_is_idiomatic_assignment;
11472 }
John McCall0506e4a2009-11-11 02:41:58 +000011473
John McCalld5707ab2009-10-12 21:59:07 +000011474 Loc = Op->getOperatorLoc();
Chandler Carruthf87d6c02011-08-16 22:30:10 +000011475 } else if (CXXOperatorCallExpr *Op = dyn_cast<CXXOperatorCallExpr>(E)) {
Douglas Gregor2d4f64f2011-01-19 16:50:08 +000011476 if (Op->getOperator() != OO_Equal && Op->getOperator() != OO_PipeEqual)
John McCalld5707ab2009-10-12 21:59:07 +000011477 return;
11478
Douglas Gregor2d4f64f2011-01-19 16:50:08 +000011479 IsOrAssign = Op->getOperator() == OO_PipeEqual;
John McCalld5707ab2009-10-12 21:59:07 +000011480 Loc = Op->getOperatorLoc();
Fariborz Jahanianf07bcc52012-08-29 17:17:11 +000011481 } else if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(E))
11482 return DiagnoseAssignmentAsCondition(POE->getSyntacticForm());
11483 else {
John McCalld5707ab2009-10-12 21:59:07 +000011484 // Not an assignment.
11485 return;
11486 }
11487
Douglas Gregor2bf2d3d2010-04-14 16:09:52 +000011488 Diag(Loc, diagnostic) << E->getSourceRange();
Douglas Gregor2d4f64f2011-01-19 16:50:08 +000011489
Daniel Dunbar62ee6412012-03-09 18:35:03 +000011490 SourceLocation Open = E->getLocStart();
Argyrios Kyrtzidise1b97c42011-04-25 23:01:29 +000011491 SourceLocation Close = PP.getLocForEndOfToken(E->getSourceRange().getEnd());
11492 Diag(Loc, diag::note_condition_assign_silence)
11493 << FixItHint::CreateInsertion(Open, "(")
11494 << FixItHint::CreateInsertion(Close, ")");
11495
Douglas Gregor2d4f64f2011-01-19 16:50:08 +000011496 if (IsOrAssign)
11497 Diag(Loc, diag::note_condition_or_assign_to_comparison)
11498 << FixItHint::CreateReplacement(Loc, "!=");
11499 else
11500 Diag(Loc, diag::note_condition_assign_to_comparison)
11501 << FixItHint::CreateReplacement(Loc, "==");
John McCalld5707ab2009-10-12 21:59:07 +000011502}
11503
Argyrios Kyrtzidis8b6ec682011-02-01 18:24:22 +000011504/// \brief Redundant parentheses over an equality comparison can indicate
11505/// that the user intended an assignment used as condition.
Richard Trieuba63ce62011-09-09 01:45:06 +000011506void Sema::DiagnoseEqualityWithExtraParens(ParenExpr *ParenE) {
Argyrios Kyrtzidisf4f82782011-02-01 22:23:56 +000011507 // Don't warn if the parens came from a macro.
Richard Trieuba63ce62011-09-09 01:45:06 +000011508 SourceLocation parenLoc = ParenE->getLocStart();
Argyrios Kyrtzidisf4f82782011-02-01 22:23:56 +000011509 if (parenLoc.isInvalid() || parenLoc.isMacroID())
11510 return;
Argyrios Kyrtzidisba699d62011-03-28 23:52:04 +000011511 // Don't warn for dependent expressions.
Richard Trieuba63ce62011-09-09 01:45:06 +000011512 if (ParenE->isTypeDependent())
Argyrios Kyrtzidisba699d62011-03-28 23:52:04 +000011513 return;
Argyrios Kyrtzidisf4f82782011-02-01 22:23:56 +000011514
Richard Trieuba63ce62011-09-09 01:45:06 +000011515 Expr *E = ParenE->IgnoreParens();
Argyrios Kyrtzidis8b6ec682011-02-01 18:24:22 +000011516
11517 if (BinaryOperator *opE = dyn_cast<BinaryOperator>(E))
Argyrios Kyrtzidis582dd682011-02-01 19:32:59 +000011518 if (opE->getOpcode() == BO_EQ &&
11519 opE->getLHS()->IgnoreParenImpCasts()->isModifiableLvalue(Context)
11520 == Expr::MLV_Valid) {
Argyrios Kyrtzidis8b6ec682011-02-01 18:24:22 +000011521 SourceLocation Loc = opE->getOperatorLoc();
Ted Kremenekc358d9f2011-02-01 22:36:09 +000011522
Ted Kremenekae022092011-02-02 02:20:30 +000011523 Diag(Loc, diag::warn_equality_with_extra_parens) << E->getSourceRange();
Daniel Dunbar62ee6412012-03-09 18:35:03 +000011524 SourceRange ParenERange = ParenE->getSourceRange();
Ted Kremenekae022092011-02-02 02:20:30 +000011525 Diag(Loc, diag::note_equality_comparison_silence)
Daniel Dunbar62ee6412012-03-09 18:35:03 +000011526 << FixItHint::CreateRemoval(ParenERange.getBegin())
11527 << FixItHint::CreateRemoval(ParenERange.getEnd());
Argyrios Kyrtzidise1b97c42011-04-25 23:01:29 +000011528 Diag(Loc, diag::note_equality_comparison_to_assign)
11529 << FixItHint::CreateReplacement(Loc, "=");
Argyrios Kyrtzidis8b6ec682011-02-01 18:24:22 +000011530 }
11531}
11532
John Wiegley01296292011-04-08 18:41:53 +000011533ExprResult Sema::CheckBooleanCondition(Expr *E, SourceLocation Loc) {
John McCalld5707ab2009-10-12 21:59:07 +000011534 DiagnoseAssignmentAsCondition(E);
Argyrios Kyrtzidis8b6ec682011-02-01 18:24:22 +000011535 if (ParenExpr *parenE = dyn_cast<ParenExpr>(E))
11536 DiagnoseEqualityWithExtraParens(parenE);
John McCalld5707ab2009-10-12 21:59:07 +000011537
John McCall0009fcc2011-04-26 20:42:42 +000011538 ExprResult result = CheckPlaceholderExpr(E);
11539 if (result.isInvalid()) return ExprError();
11540 E = result.take();
Argyrios Kyrtzidisca766292010-11-01 18:49:26 +000011541
John McCall0009fcc2011-04-26 20:42:42 +000011542 if (!E->isTypeDependent()) {
David Blaikiebbafb8a2012-03-11 07:00:24 +000011543 if (getLangOpts().CPlusPlus)
John McCall34376a62010-12-04 03:47:34 +000011544 return CheckCXXBooleanCondition(E); // C++ 6.4p4
11545
John Wiegley01296292011-04-08 18:41:53 +000011546 ExprResult ERes = DefaultFunctionArrayLvalueConversion(E);
11547 if (ERes.isInvalid())
11548 return ExprError();
11549 E = ERes.take();
John McCall29cb2fd2010-12-04 06:09:13 +000011550
11551 QualType T = E->getType();
John Wiegley01296292011-04-08 18:41:53 +000011552 if (!T->isScalarType()) { // C99 6.8.4.1p1
11553 Diag(Loc, diag::err_typecheck_statement_requires_scalar)
11554 << T << E->getSourceRange();
11555 return ExprError();
11556 }
John McCalld5707ab2009-10-12 21:59:07 +000011557 }
11558
John Wiegley01296292011-04-08 18:41:53 +000011559 return Owned(E);
John McCalld5707ab2009-10-12 21:59:07 +000011560}
Douglas Gregore60e41a2010-05-06 17:25:47 +000011561
John McCalldadc5752010-08-24 06:29:42 +000011562ExprResult Sema::ActOnBooleanCondition(Scope *S, SourceLocation Loc,
Richard Trieuba63ce62011-09-09 01:45:06 +000011563 Expr *SubExpr) {
11564 if (!SubExpr)
Douglas Gregore60e41a2010-05-06 17:25:47 +000011565 return ExprError();
John Wiegley01296292011-04-08 18:41:53 +000011566
Richard Trieuba63ce62011-09-09 01:45:06 +000011567 return CheckBooleanCondition(SubExpr, Loc);
Douglas Gregore60e41a2010-05-06 17:25:47 +000011568}
John McCall36e7fe32010-10-12 00:20:44 +000011569
John McCall31996342011-04-07 08:22:57 +000011570namespace {
John McCall2979fe02011-04-12 00:42:48 +000011571 /// A visitor for rebuilding a call to an __unknown_any expression
11572 /// to have an appropriate type.
11573 struct RebuildUnknownAnyFunction
11574 : StmtVisitor<RebuildUnknownAnyFunction, ExprResult> {
11575
11576 Sema &S;
11577
11578 RebuildUnknownAnyFunction(Sema &S) : S(S) {}
11579
11580 ExprResult VisitStmt(Stmt *S) {
11581 llvm_unreachable("unexpected statement!");
John McCall2979fe02011-04-12 00:42:48 +000011582 }
11583
Richard Trieu10162ab2011-09-09 03:59:41 +000011584 ExprResult VisitExpr(Expr *E) {
11585 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_call)
11586 << E->getSourceRange();
John McCall2979fe02011-04-12 00:42:48 +000011587 return ExprError();
11588 }
11589
11590 /// Rebuild an expression which simply semantically wraps another
11591 /// expression which it shares the type and value kind of.
Richard Trieu10162ab2011-09-09 03:59:41 +000011592 template <class T> ExprResult rebuildSugarExpr(T *E) {
11593 ExprResult SubResult = Visit(E->getSubExpr());
11594 if (SubResult.isInvalid()) return ExprError();
John McCall2979fe02011-04-12 00:42:48 +000011595
Richard Trieu10162ab2011-09-09 03:59:41 +000011596 Expr *SubExpr = SubResult.take();
11597 E->setSubExpr(SubExpr);
11598 E->setType(SubExpr->getType());
11599 E->setValueKind(SubExpr->getValueKind());
11600 assert(E->getObjectKind() == OK_Ordinary);
11601 return E;
John McCall2979fe02011-04-12 00:42:48 +000011602 }
11603
Richard Trieu10162ab2011-09-09 03:59:41 +000011604 ExprResult VisitParenExpr(ParenExpr *E) {
11605 return rebuildSugarExpr(E);
John McCall2979fe02011-04-12 00:42:48 +000011606 }
11607
Richard Trieu10162ab2011-09-09 03:59:41 +000011608 ExprResult VisitUnaryExtension(UnaryOperator *E) {
11609 return rebuildSugarExpr(E);
John McCall2979fe02011-04-12 00:42:48 +000011610 }
11611
Richard Trieu10162ab2011-09-09 03:59:41 +000011612 ExprResult VisitUnaryAddrOf(UnaryOperator *E) {
11613 ExprResult SubResult = Visit(E->getSubExpr());
11614 if (SubResult.isInvalid()) return ExprError();
John McCall2979fe02011-04-12 00:42:48 +000011615
Richard Trieu10162ab2011-09-09 03:59:41 +000011616 Expr *SubExpr = SubResult.take();
11617 E->setSubExpr(SubExpr);
11618 E->setType(S.Context.getPointerType(SubExpr->getType()));
11619 assert(E->getValueKind() == VK_RValue);
11620 assert(E->getObjectKind() == OK_Ordinary);
11621 return E;
John McCall2979fe02011-04-12 00:42:48 +000011622 }
11623
Richard Trieu10162ab2011-09-09 03:59:41 +000011624 ExprResult resolveDecl(Expr *E, ValueDecl *VD) {
11625 if (!isa<FunctionDecl>(VD)) return VisitExpr(E);
John McCall2979fe02011-04-12 00:42:48 +000011626
Richard Trieu10162ab2011-09-09 03:59:41 +000011627 E->setType(VD->getType());
John McCall2979fe02011-04-12 00:42:48 +000011628
Richard Trieu10162ab2011-09-09 03:59:41 +000011629 assert(E->getValueKind() == VK_RValue);
David Blaikiebbafb8a2012-03-11 07:00:24 +000011630 if (S.getLangOpts().CPlusPlus &&
Richard Trieu10162ab2011-09-09 03:59:41 +000011631 !(isa<CXXMethodDecl>(VD) &&
11632 cast<CXXMethodDecl>(VD)->isInstance()))
11633 E->setValueKind(VK_LValue);
John McCall2979fe02011-04-12 00:42:48 +000011634
Richard Trieu10162ab2011-09-09 03:59:41 +000011635 return E;
John McCall2979fe02011-04-12 00:42:48 +000011636 }
11637
Richard Trieu10162ab2011-09-09 03:59:41 +000011638 ExprResult VisitMemberExpr(MemberExpr *E) {
11639 return resolveDecl(E, E->getMemberDecl());
John McCall2979fe02011-04-12 00:42:48 +000011640 }
11641
Richard Trieu10162ab2011-09-09 03:59:41 +000011642 ExprResult VisitDeclRefExpr(DeclRefExpr *E) {
11643 return resolveDecl(E, E->getDecl());
John McCall2979fe02011-04-12 00:42:48 +000011644 }
11645 };
11646}
11647
11648/// Given a function expression of unknown-any type, try to rebuild it
11649/// to have a function type.
Richard Trieu10162ab2011-09-09 03:59:41 +000011650static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *FunctionExpr) {
11651 ExprResult Result = RebuildUnknownAnyFunction(S).Visit(FunctionExpr);
11652 if (Result.isInvalid()) return ExprError();
11653 return S.DefaultFunctionArrayConversion(Result.take());
John McCall2979fe02011-04-12 00:42:48 +000011654}
11655
11656namespace {
John McCall2d2e8702011-04-11 07:02:50 +000011657 /// A visitor for rebuilding an expression of type __unknown_anytype
11658 /// into one which resolves the type directly on the referring
11659 /// expression. Strict preservation of the original source
11660 /// structure is not a goal.
John McCall31996342011-04-07 08:22:57 +000011661 struct RebuildUnknownAnyExpr
John McCall39439732011-04-09 22:50:59 +000011662 : StmtVisitor<RebuildUnknownAnyExpr, ExprResult> {
John McCall31996342011-04-07 08:22:57 +000011663
11664 Sema &S;
11665
11666 /// The current destination type.
11667 QualType DestType;
11668
Richard Trieu10162ab2011-09-09 03:59:41 +000011669 RebuildUnknownAnyExpr(Sema &S, QualType CastType)
11670 : S(S), DestType(CastType) {}
John McCall31996342011-04-07 08:22:57 +000011671
John McCall39439732011-04-09 22:50:59 +000011672 ExprResult VisitStmt(Stmt *S) {
John McCall2d2e8702011-04-11 07:02:50 +000011673 llvm_unreachable("unexpected statement!");
John McCall31996342011-04-07 08:22:57 +000011674 }
11675
Richard Trieu10162ab2011-09-09 03:59:41 +000011676 ExprResult VisitExpr(Expr *E) {
11677 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_expr)
11678 << E->getSourceRange();
John McCall2d2e8702011-04-11 07:02:50 +000011679 return ExprError();
John McCall31996342011-04-07 08:22:57 +000011680 }
11681
Richard Trieu10162ab2011-09-09 03:59:41 +000011682 ExprResult VisitCallExpr(CallExpr *E);
11683 ExprResult VisitObjCMessageExpr(ObjCMessageExpr *E);
John McCall2d2e8702011-04-11 07:02:50 +000011684
John McCall39439732011-04-09 22:50:59 +000011685 /// Rebuild an expression which simply semantically wraps another
11686 /// expression which it shares the type and value kind of.
Richard Trieu10162ab2011-09-09 03:59:41 +000011687 template <class T> ExprResult rebuildSugarExpr(T *E) {
11688 ExprResult SubResult = Visit(E->getSubExpr());
11689 if (SubResult.isInvalid()) return ExprError();
11690 Expr *SubExpr = SubResult.take();
11691 E->setSubExpr(SubExpr);
11692 E->setType(SubExpr->getType());
11693 E->setValueKind(SubExpr->getValueKind());
11694 assert(E->getObjectKind() == OK_Ordinary);
11695 return E;
John McCall39439732011-04-09 22:50:59 +000011696 }
John McCall31996342011-04-07 08:22:57 +000011697
Richard Trieu10162ab2011-09-09 03:59:41 +000011698 ExprResult VisitParenExpr(ParenExpr *E) {
11699 return rebuildSugarExpr(E);
John McCall39439732011-04-09 22:50:59 +000011700 }
11701
Richard Trieu10162ab2011-09-09 03:59:41 +000011702 ExprResult VisitUnaryExtension(UnaryOperator *E) {
11703 return rebuildSugarExpr(E);
John McCall39439732011-04-09 22:50:59 +000011704 }
11705
Richard Trieu10162ab2011-09-09 03:59:41 +000011706 ExprResult VisitUnaryAddrOf(UnaryOperator *E) {
11707 const PointerType *Ptr = DestType->getAs<PointerType>();
11708 if (!Ptr) {
11709 S.Diag(E->getOperatorLoc(), diag::err_unknown_any_addrof)
11710 << E->getSourceRange();
John McCall2979fe02011-04-12 00:42:48 +000011711 return ExprError();
11712 }
Richard Trieu10162ab2011-09-09 03:59:41 +000011713 assert(E->getValueKind() == VK_RValue);
11714 assert(E->getObjectKind() == OK_Ordinary);
11715 E->setType(DestType);
John McCall2979fe02011-04-12 00:42:48 +000011716
11717 // Build the sub-expression as if it were an object of the pointee type.
Richard Trieu10162ab2011-09-09 03:59:41 +000011718 DestType = Ptr->getPointeeType();
11719 ExprResult SubResult = Visit(E->getSubExpr());
11720 if (SubResult.isInvalid()) return ExprError();
11721 E->setSubExpr(SubResult.take());
11722 return E;
John McCall2979fe02011-04-12 00:42:48 +000011723 }
11724
Richard Trieu10162ab2011-09-09 03:59:41 +000011725 ExprResult VisitImplicitCastExpr(ImplicitCastExpr *E);
John McCall39439732011-04-09 22:50:59 +000011726
Richard Trieu10162ab2011-09-09 03:59:41 +000011727 ExprResult resolveDecl(Expr *E, ValueDecl *VD);
John McCall39439732011-04-09 22:50:59 +000011728
Richard Trieu10162ab2011-09-09 03:59:41 +000011729 ExprResult VisitMemberExpr(MemberExpr *E) {
11730 return resolveDecl(E, E->getMemberDecl());
John McCall2979fe02011-04-12 00:42:48 +000011731 }
John McCall39439732011-04-09 22:50:59 +000011732
Richard Trieu10162ab2011-09-09 03:59:41 +000011733 ExprResult VisitDeclRefExpr(DeclRefExpr *E) {
11734 return resolveDecl(E, E->getDecl());
John McCall31996342011-04-07 08:22:57 +000011735 }
11736 };
11737}
11738
John McCall2d2e8702011-04-11 07:02:50 +000011739/// Rebuilds a call expression which yielded __unknown_anytype.
Richard Trieu10162ab2011-09-09 03:59:41 +000011740ExprResult RebuildUnknownAnyExpr::VisitCallExpr(CallExpr *E) {
11741 Expr *CalleeExpr = E->getCallee();
John McCall2d2e8702011-04-11 07:02:50 +000011742
11743 enum FnKind {
John McCall4adb38c2011-04-27 00:36:17 +000011744 FK_MemberFunction,
John McCall2d2e8702011-04-11 07:02:50 +000011745 FK_FunctionPointer,
11746 FK_BlockPointer
11747 };
11748
Richard Trieu10162ab2011-09-09 03:59:41 +000011749 FnKind Kind;
11750 QualType CalleeType = CalleeExpr->getType();
11751 if (CalleeType == S.Context.BoundMemberTy) {
11752 assert(isa<CXXMemberCallExpr>(E) || isa<CXXOperatorCallExpr>(E));
11753 Kind = FK_MemberFunction;
11754 CalleeType = Expr::findBoundMemberType(CalleeExpr);
11755 } else if (const PointerType *Ptr = CalleeType->getAs<PointerType>()) {
11756 CalleeType = Ptr->getPointeeType();
11757 Kind = FK_FunctionPointer;
John McCall2d2e8702011-04-11 07:02:50 +000011758 } else {
Richard Trieu10162ab2011-09-09 03:59:41 +000011759 CalleeType = CalleeType->castAs<BlockPointerType>()->getPointeeType();
11760 Kind = FK_BlockPointer;
John McCall2d2e8702011-04-11 07:02:50 +000011761 }
Richard Trieu10162ab2011-09-09 03:59:41 +000011762 const FunctionType *FnType = CalleeType->castAs<FunctionType>();
John McCall2d2e8702011-04-11 07:02:50 +000011763
11764 // Verify that this is a legal result type of a function.
11765 if (DestType->isArrayType() || DestType->isFunctionType()) {
11766 unsigned diagID = diag::err_func_returning_array_function;
Richard Trieu10162ab2011-09-09 03:59:41 +000011767 if (Kind == FK_BlockPointer)
John McCall2d2e8702011-04-11 07:02:50 +000011768 diagID = diag::err_block_returning_array_function;
11769
Richard Trieu10162ab2011-09-09 03:59:41 +000011770 S.Diag(E->getExprLoc(), diagID)
John McCall2d2e8702011-04-11 07:02:50 +000011771 << DestType->isFunctionType() << DestType;
11772 return ExprError();
11773 }
11774
11775 // Otherwise, go ahead and set DestType as the call's result.
Richard Trieu10162ab2011-09-09 03:59:41 +000011776 E->setType(DestType.getNonLValueExprType(S.Context));
11777 E->setValueKind(Expr::getValueKindForType(DestType));
11778 assert(E->getObjectKind() == OK_Ordinary);
John McCall2d2e8702011-04-11 07:02:50 +000011779
11780 // Rebuild the function type, replacing the result type with DestType.
Richard Trieu10162ab2011-09-09 03:59:41 +000011781 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FnType))
John McCall2d2e8702011-04-11 07:02:50 +000011782 DestType = S.Context.getFunctionType(DestType,
Richard Trieu10162ab2011-09-09 03:59:41 +000011783 Proto->arg_type_begin(),
11784 Proto->getNumArgs(),
11785 Proto->getExtProtoInfo());
John McCall2d2e8702011-04-11 07:02:50 +000011786 else
11787 DestType = S.Context.getFunctionNoProtoType(DestType,
Richard Trieu10162ab2011-09-09 03:59:41 +000011788 FnType->getExtInfo());
John McCall2d2e8702011-04-11 07:02:50 +000011789
11790 // Rebuild the appropriate pointer-to-function type.
Richard Trieu10162ab2011-09-09 03:59:41 +000011791 switch (Kind) {
John McCall4adb38c2011-04-27 00:36:17 +000011792 case FK_MemberFunction:
John McCall2d2e8702011-04-11 07:02:50 +000011793 // Nothing to do.
11794 break;
11795
11796 case FK_FunctionPointer:
11797 DestType = S.Context.getPointerType(DestType);
11798 break;
11799
11800 case FK_BlockPointer:
11801 DestType = S.Context.getBlockPointerType(DestType);
11802 break;
11803 }
11804
11805 // Finally, we can recurse.
Richard Trieu10162ab2011-09-09 03:59:41 +000011806 ExprResult CalleeResult = Visit(CalleeExpr);
11807 if (!CalleeResult.isUsable()) return ExprError();
11808 E->setCallee(CalleeResult.take());
John McCall2d2e8702011-04-11 07:02:50 +000011809
11810 // Bind a temporary if necessary.
Richard Trieu10162ab2011-09-09 03:59:41 +000011811 return S.MaybeBindToTemporary(E);
John McCall2d2e8702011-04-11 07:02:50 +000011812}
11813
Richard Trieu10162ab2011-09-09 03:59:41 +000011814ExprResult RebuildUnknownAnyExpr::VisitObjCMessageExpr(ObjCMessageExpr *E) {
John McCall2979fe02011-04-12 00:42:48 +000011815 // Verify that this is a legal result type of a call.
11816 if (DestType->isArrayType() || DestType->isFunctionType()) {
Richard Trieu10162ab2011-09-09 03:59:41 +000011817 S.Diag(E->getExprLoc(), diag::err_func_returning_array_function)
John McCall2979fe02011-04-12 00:42:48 +000011818 << DestType->isFunctionType() << DestType;
11819 return ExprError();
John McCall2d2e8702011-04-11 07:02:50 +000011820 }
11821
John McCall3f4138c2011-07-13 17:56:40 +000011822 // Rewrite the method result type if available.
Richard Trieu10162ab2011-09-09 03:59:41 +000011823 if (ObjCMethodDecl *Method = E->getMethodDecl()) {
11824 assert(Method->getResultType() == S.Context.UnknownAnyTy);
11825 Method->setResultType(DestType);
John McCall3f4138c2011-07-13 17:56:40 +000011826 }
John McCall2979fe02011-04-12 00:42:48 +000011827
John McCall2d2e8702011-04-11 07:02:50 +000011828 // Change the type of the message.
Richard Trieu10162ab2011-09-09 03:59:41 +000011829 E->setType(DestType.getNonReferenceType());
11830 E->setValueKind(Expr::getValueKindForType(DestType));
John McCall2d2e8702011-04-11 07:02:50 +000011831
Richard Trieu10162ab2011-09-09 03:59:41 +000011832 return S.MaybeBindToTemporary(E);
John McCall2d2e8702011-04-11 07:02:50 +000011833}
11834
Richard Trieu10162ab2011-09-09 03:59:41 +000011835ExprResult RebuildUnknownAnyExpr::VisitImplicitCastExpr(ImplicitCastExpr *E) {
John McCall2979fe02011-04-12 00:42:48 +000011836 // The only case we should ever see here is a function-to-pointer decay.
Sean Callanan2db103c2012-03-06 23:12:57 +000011837 if (E->getCastKind() == CK_FunctionToPointerDecay) {
Sean Callanan12495112012-03-06 21:34:12 +000011838 assert(E->getValueKind() == VK_RValue);
11839 assert(E->getObjectKind() == OK_Ordinary);
11840
11841 E->setType(DestType);
11842
11843 // Rebuild the sub-expression as the pointee (function) type.
11844 DestType = DestType->castAs<PointerType>()->getPointeeType();
11845
11846 ExprResult Result = Visit(E->getSubExpr());
11847 if (!Result.isUsable()) return ExprError();
11848
11849 E->setSubExpr(Result.take());
11850 return S.Owned(E);
Sean Callanan2db103c2012-03-06 23:12:57 +000011851 } else if (E->getCastKind() == CK_LValueToRValue) {
Sean Callanan12495112012-03-06 21:34:12 +000011852 assert(E->getValueKind() == VK_RValue);
11853 assert(E->getObjectKind() == OK_Ordinary);
John McCall2d2e8702011-04-11 07:02:50 +000011854
Sean Callanan12495112012-03-06 21:34:12 +000011855 assert(isa<BlockPointerType>(E->getType()));
John McCall2979fe02011-04-12 00:42:48 +000011856
Sean Callanan12495112012-03-06 21:34:12 +000011857 E->setType(DestType);
John McCall2d2e8702011-04-11 07:02:50 +000011858
Sean Callanan12495112012-03-06 21:34:12 +000011859 // The sub-expression has to be a lvalue reference, so rebuild it as such.
11860 DestType = S.Context.getLValueReferenceType(DestType);
John McCall2d2e8702011-04-11 07:02:50 +000011861
Sean Callanan12495112012-03-06 21:34:12 +000011862 ExprResult Result = Visit(E->getSubExpr());
11863 if (!Result.isUsable()) return ExprError();
11864
11865 E->setSubExpr(Result.take());
11866 return S.Owned(E);
Sean Callanan2db103c2012-03-06 23:12:57 +000011867 } else {
Sean Callanan12495112012-03-06 21:34:12 +000011868 llvm_unreachable("Unhandled cast type!");
11869 }
John McCall2d2e8702011-04-11 07:02:50 +000011870}
11871
Richard Trieu10162ab2011-09-09 03:59:41 +000011872ExprResult RebuildUnknownAnyExpr::resolveDecl(Expr *E, ValueDecl *VD) {
11873 ExprValueKind ValueKind = VK_LValue;
11874 QualType Type = DestType;
John McCall2d2e8702011-04-11 07:02:50 +000011875
11876 // We know how to make this work for certain kinds of decls:
11877
11878 // - functions
Richard Trieu10162ab2011-09-09 03:59:41 +000011879 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(VD)) {
11880 if (const PointerType *Ptr = Type->getAs<PointerType>()) {
11881 DestType = Ptr->getPointeeType();
11882 ExprResult Result = resolveDecl(E, VD);
11883 if (Result.isInvalid()) return ExprError();
11884 return S.ImpCastExprToType(Result.take(), Type,
John McCall9a877fe2011-08-10 04:12:23 +000011885 CK_FunctionToPointerDecay, VK_RValue);
11886 }
11887
Richard Trieu10162ab2011-09-09 03:59:41 +000011888 if (!Type->isFunctionType()) {
11889 S.Diag(E->getExprLoc(), diag::err_unknown_any_function)
11890 << VD << E->getSourceRange();
John McCall9a877fe2011-08-10 04:12:23 +000011891 return ExprError();
11892 }
John McCall2d2e8702011-04-11 07:02:50 +000011893
Richard Trieu10162ab2011-09-09 03:59:41 +000011894 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
11895 if (MD->isInstance()) {
11896 ValueKind = VK_RValue;
11897 Type = S.Context.BoundMemberTy;
John McCall4adb38c2011-04-27 00:36:17 +000011898 }
11899
John McCall2d2e8702011-04-11 07:02:50 +000011900 // Function references aren't l-values in C.
David Blaikiebbafb8a2012-03-11 07:00:24 +000011901 if (!S.getLangOpts().CPlusPlus)
Richard Trieu10162ab2011-09-09 03:59:41 +000011902 ValueKind = VK_RValue;
John McCall2d2e8702011-04-11 07:02:50 +000011903
11904 // - variables
Richard Trieu10162ab2011-09-09 03:59:41 +000011905 } else if (isa<VarDecl>(VD)) {
11906 if (const ReferenceType *RefTy = Type->getAs<ReferenceType>()) {
11907 Type = RefTy->getPointeeType();
11908 } else if (Type->isFunctionType()) {
11909 S.Diag(E->getExprLoc(), diag::err_unknown_any_var_function_type)
11910 << VD << E->getSourceRange();
John McCall2979fe02011-04-12 00:42:48 +000011911 return ExprError();
John McCall2d2e8702011-04-11 07:02:50 +000011912 }
11913
11914 // - nothing else
11915 } else {
Richard Trieu10162ab2011-09-09 03:59:41 +000011916 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_decl)
11917 << VD << E->getSourceRange();
John McCall2d2e8702011-04-11 07:02:50 +000011918 return ExprError();
11919 }
11920
Richard Trieu10162ab2011-09-09 03:59:41 +000011921 VD->setType(DestType);
11922 E->setType(Type);
11923 E->setValueKind(ValueKind);
11924 return S.Owned(E);
John McCall2d2e8702011-04-11 07:02:50 +000011925}
11926
John McCall31996342011-04-07 08:22:57 +000011927/// Check a cast of an unknown-any type. We intentionally only
11928/// trigger this for C-style casts.
Richard Trieuba63ce62011-09-09 01:45:06 +000011929ExprResult Sema::checkUnknownAnyCast(SourceRange TypeRange, QualType CastType,
11930 Expr *CastExpr, CastKind &CastKind,
11931 ExprValueKind &VK, CXXCastPath &Path) {
John McCall31996342011-04-07 08:22:57 +000011932 // Rewrite the casted expression from scratch.
Richard Trieuba63ce62011-09-09 01:45:06 +000011933 ExprResult result = RebuildUnknownAnyExpr(*this, CastType).Visit(CastExpr);
John McCall39439732011-04-09 22:50:59 +000011934 if (!result.isUsable()) return ExprError();
John McCall31996342011-04-07 08:22:57 +000011935
Richard Trieuba63ce62011-09-09 01:45:06 +000011936 CastExpr = result.take();
11937 VK = CastExpr->getValueKind();
11938 CastKind = CK_NoOp;
John McCall39439732011-04-09 22:50:59 +000011939
Richard Trieuba63ce62011-09-09 01:45:06 +000011940 return CastExpr;
John McCall31996342011-04-07 08:22:57 +000011941}
11942
Douglas Gregord8fb1e32011-12-01 01:37:36 +000011943ExprResult Sema::forceUnknownAnyToType(Expr *E, QualType ToType) {
11944 return RebuildUnknownAnyExpr(*this, ToType).Visit(E);
11945}
11946
John McCallea0a39e2012-11-14 00:49:39 +000011947QualType Sema::checkUnknownAnyArg(Expr *&arg) {
11948 // Filter out placeholders.
11949 ExprResult argR = CheckPlaceholderExpr(arg);
11950 if (argR.isInvalid()) return QualType();
11951 arg = argR.take();
11952
11953 // If the argument is an explicit cast, use that exact type as the
11954 // effective parameter type.
11955 if (ExplicitCastExpr *castArg = dyn_cast<ExplicitCastExpr>(arg)) {
11956 return castArg->getTypeAsWritten();
11957 }
11958
11959 // Otherwise, try to pass by value.
11960 return arg->getType().getUnqualifiedType();
11961}
11962
Richard Trieuba63ce62011-09-09 01:45:06 +000011963static ExprResult diagnoseUnknownAnyExpr(Sema &S, Expr *E) {
11964 Expr *orig = E;
John McCall2d2e8702011-04-11 07:02:50 +000011965 unsigned diagID = diag::err_uncasted_use_of_unknown_any;
John McCall31996342011-04-07 08:22:57 +000011966 while (true) {
Richard Trieuba63ce62011-09-09 01:45:06 +000011967 E = E->IgnoreParenImpCasts();
11968 if (CallExpr *call = dyn_cast<CallExpr>(E)) {
11969 E = call->getCallee();
John McCall2d2e8702011-04-11 07:02:50 +000011970 diagID = diag::err_uncasted_call_of_unknown_any;
11971 } else {
John McCall31996342011-04-07 08:22:57 +000011972 break;
John McCall2d2e8702011-04-11 07:02:50 +000011973 }
John McCall31996342011-04-07 08:22:57 +000011974 }
11975
John McCall2d2e8702011-04-11 07:02:50 +000011976 SourceLocation loc;
11977 NamedDecl *d;
Richard Trieuba63ce62011-09-09 01:45:06 +000011978 if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(E)) {
John McCall2d2e8702011-04-11 07:02:50 +000011979 loc = ref->getLocation();
11980 d = ref->getDecl();
Richard Trieuba63ce62011-09-09 01:45:06 +000011981 } else if (MemberExpr *mem = dyn_cast<MemberExpr>(E)) {
John McCall2d2e8702011-04-11 07:02:50 +000011982 loc = mem->getMemberLoc();
11983 d = mem->getMemberDecl();
Richard Trieuba63ce62011-09-09 01:45:06 +000011984 } else if (ObjCMessageExpr *msg = dyn_cast<ObjCMessageExpr>(E)) {
John McCall2d2e8702011-04-11 07:02:50 +000011985 diagID = diag::err_uncasted_call_of_unknown_any;
Argyrios Kyrtzidisa6011e22011-10-03 06:36:51 +000011986 loc = msg->getSelectorStartLoc();
John McCall2d2e8702011-04-11 07:02:50 +000011987 d = msg->getMethodDecl();
John McCallfa6f5d62011-08-31 20:57:36 +000011988 if (!d) {
11989 S.Diag(loc, diag::err_uncasted_send_to_unknown_any_method)
11990 << static_cast<unsigned>(msg->isClassMessage()) << msg->getSelector()
11991 << orig->getSourceRange();
11992 return ExprError();
11993 }
John McCall2d2e8702011-04-11 07:02:50 +000011994 } else {
Richard Trieuba63ce62011-09-09 01:45:06 +000011995 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_expr)
11996 << E->getSourceRange();
John McCall2d2e8702011-04-11 07:02:50 +000011997 return ExprError();
11998 }
11999
12000 S.Diag(loc, diagID) << d << orig->getSourceRange();
John McCall31996342011-04-07 08:22:57 +000012001
12002 // Never recoverable.
12003 return ExprError();
12004}
12005
John McCall36e7fe32010-10-12 00:20:44 +000012006/// Check for operands with placeholder types and complain if found.
12007/// Returns true if there was an error and no recovery was possible.
John McCall3aef3d82011-04-10 19:13:55 +000012008ExprResult Sema::CheckPlaceholderExpr(Expr *E) {
John McCall4124c492011-10-17 18:40:02 +000012009 const BuiltinType *placeholderType = E->getType()->getAsPlaceholderType();
12010 if (!placeholderType) return Owned(E);
12011
12012 switch (placeholderType->getKind()) {
John McCall36e7fe32010-10-12 00:20:44 +000012013
John McCall31996342011-04-07 08:22:57 +000012014 // Overloaded expressions.
John McCall4124c492011-10-17 18:40:02 +000012015 case BuiltinType::Overload: {
John McCall50a2c2c2011-10-11 23:14:30 +000012016 // Try to resolve a single function template specialization.
12017 // This is obligatory.
12018 ExprResult result = Owned(E);
12019 if (ResolveAndFixSingleFunctionTemplateSpecialization(result, false)) {
12020 return result;
12021
12022 // If that failed, try to recover with a call.
12023 } else {
12024 tryToRecoverWithCall(result, PDiag(diag::err_ovl_unresolvable),
12025 /*complain*/ true);
12026 return result;
12027 }
12028 }
John McCall31996342011-04-07 08:22:57 +000012029
John McCall0009fcc2011-04-26 20:42:42 +000012030 // Bound member functions.
John McCall4124c492011-10-17 18:40:02 +000012031 case BuiltinType::BoundMember: {
John McCall50a2c2c2011-10-11 23:14:30 +000012032 ExprResult result = Owned(E);
12033 tryToRecoverWithCall(result, PDiag(diag::err_bound_member_function),
12034 /*complain*/ true);
12035 return result;
John McCall4124c492011-10-17 18:40:02 +000012036 }
12037
12038 // ARC unbridged casts.
12039 case BuiltinType::ARCUnbridgedCast: {
12040 Expr *realCast = stripARCUnbridgedCast(E);
12041 diagnoseARCUnbridgedCast(realCast);
12042 return Owned(realCast);
12043 }
John McCall0009fcc2011-04-26 20:42:42 +000012044
John McCall31996342011-04-07 08:22:57 +000012045 // Expressions of unknown type.
John McCall4124c492011-10-17 18:40:02 +000012046 case BuiltinType::UnknownAny:
John McCall31996342011-04-07 08:22:57 +000012047 return diagnoseUnknownAnyExpr(*this, E);
12048
John McCall526ab472011-10-25 17:37:35 +000012049 // Pseudo-objects.
12050 case BuiltinType::PseudoObject:
12051 return checkPseudoObjectRValue(E);
12052
Eli Friedman34866c72012-08-31 00:14:07 +000012053 case BuiltinType::BuiltinFn:
12054 Diag(E->getLocStart(), diag::err_builtin_fn_use);
12055 return ExprError();
12056
John McCalle314e272011-10-18 21:02:43 +000012057 // Everything else should be impossible.
12058#define BUILTIN_TYPE(Id, SingletonId) \
12059 case BuiltinType::Id:
12060#define PLACEHOLDER_TYPE(Id, SingletonId)
12061#include "clang/AST/BuiltinTypes.def"
John McCall4124c492011-10-17 18:40:02 +000012062 break;
12063 }
12064
12065 llvm_unreachable("invalid placeholder type!");
John McCall36e7fe32010-10-12 00:20:44 +000012066}
Richard Trieu2c850c02011-04-21 21:44:26 +000012067
Richard Trieuba63ce62011-09-09 01:45:06 +000012068bool Sema::CheckCaseExpression(Expr *E) {
12069 if (E->isTypeDependent())
Richard Trieu2c850c02011-04-21 21:44:26 +000012070 return true;
Richard Trieuba63ce62011-09-09 01:45:06 +000012071 if (E->isValueDependent() || E->isIntegerConstantExpr(Context))
12072 return E->getType()->isIntegralOrEnumerationType();
Richard Trieu2c850c02011-04-21 21:44:26 +000012073 return false;
12074}
Ted Kremeneke65b0862012-03-06 20:05:56 +000012075
12076/// ActOnObjCBoolLiteral - Parse {__objc_yes,__objc_no} literals.
12077ExprResult
12078Sema::ActOnObjCBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
12079 assert((Kind == tok::kw___objc_yes || Kind == tok::kw___objc_no) &&
12080 "Unknown Objective-C Boolean value!");
Fariborz Jahanianf2578572012-08-30 18:49:41 +000012081 QualType BoolT = Context.ObjCBuiltinBoolTy;
12082 if (!Context.getBOOLDecl()) {
Fariborz Jahanianeab17302012-10-16 17:08:11 +000012083 LookupResult Result(*this, &Context.Idents.get("BOOL"), OpLoc,
Fariborz Jahanianf2578572012-08-30 18:49:41 +000012084 Sema::LookupOrdinaryName);
Fariborz Jahanian379e5362012-10-16 16:21:20 +000012085 if (LookupName(Result, getCurScope()) && Result.isSingleResult()) {
Fariborz Jahanianf2578572012-08-30 18:49:41 +000012086 NamedDecl *ND = Result.getFoundDecl();
12087 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(ND))
12088 Context.setBOOLDecl(TD);
12089 }
12090 }
12091 if (Context.getBOOLDecl())
12092 BoolT = Context.getBOOLType();
Ted Kremeneke65b0862012-03-06 20:05:56 +000012093 return Owned(new (Context) ObjCBoolLiteralExpr(Kind == tok::kw___objc_yes,
Fariborz Jahanianf2578572012-08-30 18:49:41 +000012094 BoolT, OpLoc));
Ted Kremeneke65b0862012-03-06 20:05:56 +000012095}