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Reid Spencer5f016e22007-07-11 17:01:13 +00001//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===//
2//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner0bc735f2007-12-29 19:59:25 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Reid Spencer5f016e22007-07-11 17:01:13 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This file implements semantic analysis for expressions.
11//
12//===----------------------------------------------------------------------===//
13
John McCall2d887082010-08-25 22:03:47 +000014#include "clang/Sema/SemaInternal.h"
Douglas Gregore737f502010-08-12 20:07:10 +000015#include "clang/Sema/Initialization.h"
16#include "clang/Sema/Lookup.h"
17#include "clang/Sema/AnalysisBasedWarnings.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000018#include "clang/AST/ASTContext.h"
Sebastian Redlf79a7192011-04-29 08:19:30 +000019#include "clang/AST/ASTMutationListener.h"
Douglas Gregorcc8a5d52010-04-29 00:18:15 +000020#include "clang/AST/CXXInheritance.h"
Daniel Dunbarc4a1dea2008-08-11 05:35:13 +000021#include "clang/AST/DeclObjC.h"
Anders Carlssond497ba72009-08-26 22:59:12 +000022#include "clang/AST/DeclTemplate.h"
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000023#include "clang/AST/EvaluatedExprVisitor.h"
Douglas Gregor8ecdb652010-04-28 22:16:22 +000024#include "clang/AST/Expr.h"
Chris Lattner04421082008-04-08 04:40:51 +000025#include "clang/AST/ExprCXX.h"
Steve Narofff494b572008-05-29 21:12:08 +000026#include "clang/AST/ExprObjC.h"
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000027#include "clang/AST/RecursiveASTVisitor.h"
Douglas Gregor8ecdb652010-04-28 22:16:22 +000028#include "clang/AST/TypeLoc.h"
Anders Carlssond497ba72009-08-26 22:59:12 +000029#include "clang/Basic/PartialDiagnostic.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000030#include "clang/Basic/SourceManager.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000031#include "clang/Basic/TargetInfo.h"
Anders Carlssond497ba72009-08-26 22:59:12 +000032#include "clang/Lex/LiteralSupport.h"
33#include "clang/Lex/Preprocessor.h"
John McCall19510852010-08-20 18:27:03 +000034#include "clang/Sema/DeclSpec.h"
35#include "clang/Sema/Designator.h"
36#include "clang/Sema/Scope.h"
John McCall781472f2010-08-25 08:40:02 +000037#include "clang/Sema/ScopeInfo.h"
John McCall19510852010-08-20 18:27:03 +000038#include "clang/Sema/ParsedTemplate.h"
Anna Zaks67221552011-07-28 19:51:27 +000039#include "clang/Sema/SemaFixItUtils.h"
John McCall7cd088e2010-08-24 07:21:54 +000040#include "clang/Sema/Template.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000041using namespace clang;
John McCall781472f2010-08-25 08:40:02 +000042using namespace sema;
Reid Spencer5f016e22007-07-11 17:01:13 +000043
Sebastian Redl14b0c192011-09-24 17:48:00 +000044/// \brief Determine whether the use of this declaration is valid, without
45/// emitting diagnostics.
46bool Sema::CanUseDecl(NamedDecl *D) {
47 // See if this is an auto-typed variable whose initializer we are parsing.
48 if (ParsingInitForAutoVars.count(D))
49 return false;
50
51 // See if this is a deleted function.
52 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
53 if (FD->isDeleted())
54 return false;
55 }
Sebastian Redl28bdb142011-10-16 18:19:16 +000056
57 // See if this function is unavailable.
58 if (D->getAvailability() == AR_Unavailable &&
59 cast<Decl>(CurContext)->getAvailability() != AR_Unavailable)
60 return false;
61
Sebastian Redl14b0c192011-09-24 17:48:00 +000062 return true;
63}
David Chisnall0f436562009-08-17 16:35:33 +000064
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +000065static AvailabilityResult DiagnoseAvailabilityOfDecl(Sema &S,
66 NamedDecl *D, SourceLocation Loc,
67 const ObjCInterfaceDecl *UnknownObjCClass) {
68 // See if this declaration is unavailable or deprecated.
69 std::string Message;
70 AvailabilityResult Result = D->getAvailability(&Message);
71 switch (Result) {
72 case AR_Available:
73 case AR_NotYetIntroduced:
74 break;
75
76 case AR_Deprecated:
77 S.EmitDeprecationWarning(D, Message, Loc, UnknownObjCClass);
78 break;
79
80 case AR_Unavailable:
Argyrios Kyrtzidisc076e372011-10-06 23:23:27 +000081 if (S.getCurContextAvailability() != AR_Unavailable) {
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +000082 if (Message.empty()) {
83 if (!UnknownObjCClass)
84 S.Diag(Loc, diag::err_unavailable) << D->getDeclName();
85 else
86 S.Diag(Loc, diag::warn_unavailable_fwdclass_message)
87 << D->getDeclName();
88 }
89 else
90 S.Diag(Loc, diag::err_unavailable_message)
91 << D->getDeclName() << Message;
92 S.Diag(D->getLocation(), diag::note_unavailable_here)
93 << isa<FunctionDecl>(D) << false;
94 }
95 break;
96 }
97 return Result;
98}
99
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000100/// \brief Determine whether the use of this declaration is valid, and
101/// emit any corresponding diagnostics.
102///
103/// This routine diagnoses various problems with referencing
104/// declarations that can occur when using a declaration. For example,
105/// it might warn if a deprecated or unavailable declaration is being
106/// used, or produce an error (and return true) if a C++0x deleted
107/// function is being used.
108///
109/// \returns true if there was an error (this declaration cannot be
110/// referenced), false otherwise.
Chris Lattner52338262009-10-25 22:31:57 +0000111///
Fariborz Jahanian8e5fc9b2010-12-21 00:44:01 +0000112bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc,
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +0000113 const ObjCInterfaceDecl *UnknownObjCClass) {
Douglas Gregor9b623632010-10-12 23:32:35 +0000114 if (getLangOptions().CPlusPlus && isa<FunctionDecl>(D)) {
115 // If there were any diagnostics suppressed by template argument deduction,
116 // emit them now.
Chris Lattner5f9e2722011-07-23 10:55:15 +0000117 llvm::DenseMap<Decl *, SmallVector<PartialDiagnosticAt, 1> >::iterator
Douglas Gregor9b623632010-10-12 23:32:35 +0000118 Pos = SuppressedDiagnostics.find(D->getCanonicalDecl());
119 if (Pos != SuppressedDiagnostics.end()) {
Chris Lattner5f9e2722011-07-23 10:55:15 +0000120 SmallVectorImpl<PartialDiagnosticAt> &Suppressed = Pos->second;
Douglas Gregor9b623632010-10-12 23:32:35 +0000121 for (unsigned I = 0, N = Suppressed.size(); I != N; ++I)
122 Diag(Suppressed[I].first, Suppressed[I].second);
123
124 // Clear out the list of suppressed diagnostics, so that we don't emit
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000125 // them again for this specialization. However, we don't obsolete this
Douglas Gregor9b623632010-10-12 23:32:35 +0000126 // entry from the table, because we want to avoid ever emitting these
127 // diagnostics again.
128 Suppressed.clear();
129 }
130 }
131
Richard Smith34b41d92011-02-20 03:19:35 +0000132 // See if this is an auto-typed variable whose initializer we are parsing.
Richard Smith483b9f32011-02-21 20:05:19 +0000133 if (ParsingInitForAutoVars.count(D)) {
134 Diag(Loc, diag::err_auto_variable_cannot_appear_in_own_initializer)
135 << D->getDeclName();
136 return true;
Richard Smith34b41d92011-02-20 03:19:35 +0000137 }
138
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000139 // See if this is a deleted function.
Douglas Gregor25d944a2009-02-24 04:26:15 +0000140 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000141 if (FD->isDeleted()) {
142 Diag(Loc, diag::err_deleted_function_use);
John McCallf85e1932011-06-15 23:02:42 +0000143 Diag(D->getLocation(), diag::note_unavailable_here) << 1 << true;
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000144 return true;
145 }
Douglas Gregor25d944a2009-02-24 04:26:15 +0000146 }
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +0000147 AvailabilityResult Result =
148 DiagnoseAvailabilityOfDecl(*this, D, Loc, UnknownObjCClass);
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000149
Anders Carlsson2127ecc2010-10-22 23:37:08 +0000150 // Warn if this is used but marked unused.
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +0000151 if (D->hasAttr<UnusedAttr>())
Anders Carlsson2127ecc2010-10-22 23:37:08 +0000152 Diag(Loc, diag::warn_used_but_marked_unused) << D->getDeclName();
Fariborz Jahanian97db7262011-09-29 18:40:01 +0000153 // For available enumerator, it will become unavailable/deprecated
154 // if its enum declaration is as such.
155 if (Result == AR_Available)
156 if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D)) {
157 const DeclContext *DC = ECD->getDeclContext();
158 if (const EnumDecl *TheEnumDecl = dyn_cast<EnumDecl>(DC))
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +0000159 DiagnoseAvailabilityOfDecl(*this,
160 const_cast< EnumDecl *>(TheEnumDecl),
161 Loc, UnknownObjCClass);
Fariborz Jahanian97db7262011-09-29 18:40:01 +0000162 }
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000163 return false;
Chris Lattner76a642f2009-02-15 22:43:40 +0000164}
165
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000166/// \brief Retrieve the message suffix that should be added to a
167/// diagnostic complaining about the given function being deleted or
168/// unavailable.
169std::string Sema::getDeletedOrUnavailableSuffix(const FunctionDecl *FD) {
170 // FIXME: C++0x implicitly-deleted special member functions could be
171 // detected here so that we could improve diagnostics to say, e.g.,
172 // "base class 'A' had a deleted copy constructor".
173 if (FD->isDeleted())
174 return std::string();
175
176 std::string Message;
177 if (FD->getAvailability(&Message))
178 return ": " + Message;
179
180 return std::string();
181}
182
John McCall3323fad2011-09-09 07:56:05 +0000183/// DiagnoseSentinelCalls - This routine checks whether a call or
184/// message-send is to a declaration with the sentinel attribute, and
185/// if so, it checks that the requirements of the sentinel are
186/// satisfied.
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000187void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
John McCall3323fad2011-09-09 07:56:05 +0000188 Expr **args, unsigned numArgs) {
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000189 const SentinelAttr *attr = D->getAttr<SentinelAttr>();
Mike Stump1eb44332009-09-09 15:08:12 +0000190 if (!attr)
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000191 return;
Douglas Gregor92e986e2010-04-22 16:44:27 +0000192
John McCall3323fad2011-09-09 07:56:05 +0000193 // The number of formal parameters of the declaration.
194 unsigned numFormalParams;
Mike Stump1eb44332009-09-09 15:08:12 +0000195
John McCall3323fad2011-09-09 07:56:05 +0000196 // The kind of declaration. This is also an index into a %select in
197 // the diagnostic.
198 enum CalleeType { CT_Function, CT_Method, CT_Block } calleeType;
199
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000200 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
John McCall3323fad2011-09-09 07:56:05 +0000201 numFormalParams = MD->param_size();
202 calleeType = CT_Method;
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000203 } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
John McCall3323fad2011-09-09 07:56:05 +0000204 numFormalParams = FD->param_size();
205 calleeType = CT_Function;
206 } else if (isa<VarDecl>(D)) {
207 QualType type = cast<ValueDecl>(D)->getType();
208 const FunctionType *fn = 0;
209 if (const PointerType *ptr = type->getAs<PointerType>()) {
210 fn = ptr->getPointeeType()->getAs<FunctionType>();
211 if (!fn) return;
212 calleeType = CT_Function;
213 } else if (const BlockPointerType *ptr = type->getAs<BlockPointerType>()) {
214 fn = ptr->getPointeeType()->castAs<FunctionType>();
215 calleeType = CT_Block;
216 } else {
Fariborz Jahaniandaf04152009-05-15 20:33:25 +0000217 return;
John McCall3323fad2011-09-09 07:56:05 +0000218 }
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000219
John McCall3323fad2011-09-09 07:56:05 +0000220 if (const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(fn)) {
221 numFormalParams = proto->getNumArgs();
222 } else {
223 numFormalParams = 0;
224 }
225 } else {
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000226 return;
227 }
John McCall3323fad2011-09-09 07:56:05 +0000228
229 // "nullPos" is the number of formal parameters at the end which
230 // effectively count as part of the variadic arguments. This is
231 // useful if you would prefer to not have *any* formal parameters,
232 // but the language forces you to have at least one.
233 unsigned nullPos = attr->getNullPos();
234 assert((nullPos == 0 || nullPos == 1) && "invalid null position on sentinel");
235 numFormalParams = (nullPos > numFormalParams ? 0 : numFormalParams - nullPos);
236
237 // The number of arguments which should follow the sentinel.
238 unsigned numArgsAfterSentinel = attr->getSentinel();
239
240 // If there aren't enough arguments for all the formal parameters,
241 // the sentinel, and the args after the sentinel, complain.
242 if (numArgs < numFormalParams + numArgsAfterSentinel + 1) {
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000243 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName();
John McCall3323fad2011-09-09 07:56:05 +0000244 Diag(D->getLocation(), diag::note_sentinel_here) << calleeType;
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000245 return;
246 }
John McCall3323fad2011-09-09 07:56:05 +0000247
248 // Otherwise, find the sentinel expression.
249 Expr *sentinelExpr = args[numArgs - numArgsAfterSentinel - 1];
John McCall8eb662e2010-05-06 23:53:00 +0000250 if (!sentinelExpr) return;
John McCall8eb662e2010-05-06 23:53:00 +0000251 if (sentinelExpr->isValueDependent()) return;
Anders Carlsson343e6ff2010-11-05 15:21:33 +0000252
253 // nullptr_t is always treated as null.
254 if (sentinelExpr->getType()->isNullPtrType()) return;
255
Fariborz Jahanian9ccd7252010-07-14 16:37:51 +0000256 if (sentinelExpr->getType()->isAnyPointerType() &&
John McCall8eb662e2010-05-06 23:53:00 +0000257 sentinelExpr->IgnoreParenCasts()->isNullPointerConstant(Context,
258 Expr::NPC_ValueDependentIsNull))
259 return;
260
261 // Unfortunately, __null has type 'int'.
262 if (isa<GNUNullExpr>(sentinelExpr)) return;
263
John McCall3323fad2011-09-09 07:56:05 +0000264 // Pick a reasonable string to insert. Optimistically use 'nil' or
265 // 'NULL' if those are actually defined in the context. Only use
266 // 'nil' for ObjC methods, where it's much more likely that the
267 // variadic arguments form a list of object pointers.
268 SourceLocation MissingNilLoc
Douglas Gregorf78c4e52011-07-30 08:57:03 +0000269 = PP.getLocForEndOfToken(sentinelExpr->getLocEnd());
270 std::string NullValue;
John McCall3323fad2011-09-09 07:56:05 +0000271 if (calleeType == CT_Method &&
272 PP.getIdentifierInfo("nil")->hasMacroDefinition())
Douglas Gregorf78c4e52011-07-30 08:57:03 +0000273 NullValue = "nil";
274 else if (PP.getIdentifierInfo("NULL")->hasMacroDefinition())
275 NullValue = "NULL";
Douglas Gregorf78c4e52011-07-30 08:57:03 +0000276 else
John McCall3323fad2011-09-09 07:56:05 +0000277 NullValue = "(void*) 0";
Eli Friedman39834ba2011-09-27 23:46:37 +0000278
279 if (MissingNilLoc.isInvalid())
280 Diag(Loc, diag::warn_missing_sentinel) << calleeType;
281 else
282 Diag(MissingNilLoc, diag::warn_missing_sentinel)
283 << calleeType
284 << FixItHint::CreateInsertion(MissingNilLoc, ", " + NullValue);
John McCall3323fad2011-09-09 07:56:05 +0000285 Diag(D->getLocation(), diag::note_sentinel_here) << calleeType;
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000286}
287
Richard Trieuccd891a2011-09-09 01:45:06 +0000288SourceRange Sema::getExprRange(Expr *E) const {
289 return E ? E->getSourceRange() : SourceRange();
Douglas Gregor4b2d3f72009-02-26 21:00:50 +0000290}
291
Chris Lattnere7a2e912008-07-25 21:10:04 +0000292//===----------------------------------------------------------------------===//
293// Standard Promotions and Conversions
294//===----------------------------------------------------------------------===//
295
Chris Lattnere7a2e912008-07-25 21:10:04 +0000296/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4).
John Wiegley429bb272011-04-08 18:41:53 +0000297ExprResult Sema::DefaultFunctionArrayConversion(Expr *E) {
John McCall6dbba4f2011-10-11 23:14:30 +0000298 // Handle any placeholder expressions which made it here.
299 if (E->getType()->isPlaceholderType()) {
300 ExprResult result = CheckPlaceholderExpr(E);
301 if (result.isInvalid()) return ExprError();
302 E = result.take();
303 }
304
Chris Lattnere7a2e912008-07-25 21:10:04 +0000305 QualType Ty = E->getType();
306 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type");
307
Chris Lattnere7a2e912008-07-25 21:10:04 +0000308 if (Ty->isFunctionType())
John Wiegley429bb272011-04-08 18:41:53 +0000309 E = ImpCastExprToType(E, Context.getPointerType(Ty),
310 CK_FunctionToPointerDecay).take();
Chris Lattner67d33d82008-07-25 21:33:13 +0000311 else if (Ty->isArrayType()) {
312 // In C90 mode, arrays only promote to pointers if the array expression is
313 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has
314 // type 'array of type' is converted to an expression that has type 'pointer
315 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression
316 // that has type 'array of type' ...". The relevant change is "an lvalue"
317 // (C90) to "an expression" (C99).
Argyrios Kyrtzidisc39a3d72008-09-11 04:25:59 +0000318 //
319 // C++ 4.2p1:
320 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of
321 // T" can be converted to an rvalue of type "pointer to T".
322 //
John McCall7eb0a9e2010-11-24 05:12:34 +0000323 if (getLangOptions().C99 || getLangOptions().CPlusPlus || E->isLValue())
John Wiegley429bb272011-04-08 18:41:53 +0000324 E = ImpCastExprToType(E, Context.getArrayDecayedType(Ty),
325 CK_ArrayToPointerDecay).take();
Chris Lattner67d33d82008-07-25 21:33:13 +0000326 }
John Wiegley429bb272011-04-08 18:41:53 +0000327 return Owned(E);
Chris Lattnere7a2e912008-07-25 21:10:04 +0000328}
329
Argyrios Kyrtzidis8a285ae2011-04-26 17:41:22 +0000330static void CheckForNullPointerDereference(Sema &S, Expr *E) {
331 // Check to see if we are dereferencing a null pointer. If so,
332 // and if not volatile-qualified, this is undefined behavior that the
333 // optimizer will delete, so warn about it. People sometimes try to use this
334 // to get a deterministic trap and are surprised by clang's behavior. This
335 // only handles the pattern "*null", which is a very syntactic check.
336 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E->IgnoreParenCasts()))
337 if (UO->getOpcode() == UO_Deref &&
338 UO->getSubExpr()->IgnoreParenCasts()->
339 isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull) &&
340 !UO->getType().isVolatileQualified()) {
341 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
342 S.PDiag(diag::warn_indirection_through_null)
343 << UO->getSubExpr()->getSourceRange());
344 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
345 S.PDiag(diag::note_indirection_through_null));
346 }
347}
348
John Wiegley429bb272011-04-08 18:41:53 +0000349ExprResult Sema::DefaultLvalueConversion(Expr *E) {
John McCall6dbba4f2011-10-11 23:14:30 +0000350 // Handle any placeholder expressions which made it here.
351 if (E->getType()->isPlaceholderType()) {
352 ExprResult result = CheckPlaceholderExpr(E);
353 if (result.isInvalid()) return ExprError();
354 E = result.take();
355 }
356
John McCall0ae287a2010-12-01 04:43:34 +0000357 // C++ [conv.lval]p1:
358 // A glvalue of a non-function, non-array type T can be
359 // converted to a prvalue.
John Wiegley429bb272011-04-08 18:41:53 +0000360 if (!E->isGLValue()) return Owned(E);
Kaelyn Uhraind6c88652011-08-05 23:18:04 +0000361
John McCall409fa9a2010-12-06 20:48:59 +0000362 QualType T = E->getType();
363 assert(!T.isNull() && "r-value conversion on typeless expression?");
John McCallf6a16482010-12-04 03:47:34 +0000364
Eli Friedmanb001de72011-10-06 23:00:33 +0000365 // We can't do lvalue-to-rvalue on atomics yet.
John McCall3c3b7f92011-10-25 17:37:35 +0000366 if (T->isAtomicType())
Eli Friedmanb001de72011-10-06 23:00:33 +0000367 return Owned(E);
368
John McCall409fa9a2010-12-06 20:48:59 +0000369 // We don't want to throw lvalue-to-rvalue casts on top of
370 // expressions of certain types in C++.
371 if (getLangOptions().CPlusPlus &&
372 (E->getType() == Context.OverloadTy ||
373 T->isDependentType() ||
374 T->isRecordType()))
John Wiegley429bb272011-04-08 18:41:53 +0000375 return Owned(E);
John McCall409fa9a2010-12-06 20:48:59 +0000376
377 // The C standard is actually really unclear on this point, and
378 // DR106 tells us what the result should be but not why. It's
379 // generally best to say that void types just doesn't undergo
380 // lvalue-to-rvalue at all. Note that expressions of unqualified
381 // 'void' type are never l-values, but qualified void can be.
382 if (T->isVoidType())
John Wiegley429bb272011-04-08 18:41:53 +0000383 return Owned(E);
John McCall409fa9a2010-12-06 20:48:59 +0000384
Argyrios Kyrtzidis8a285ae2011-04-26 17:41:22 +0000385 CheckForNullPointerDereference(*this, E);
386
John McCall409fa9a2010-12-06 20:48:59 +0000387 // C++ [conv.lval]p1:
388 // [...] If T is a non-class type, the type of the prvalue is the
389 // cv-unqualified version of T. Otherwise, the type of the
390 // rvalue is T.
391 //
392 // C99 6.3.2.1p2:
393 // If the lvalue has qualified type, the value has the unqualified
394 // version of the type of the lvalue; otherwise, the value has the
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000395 // type of the lvalue.
John McCall409fa9a2010-12-06 20:48:59 +0000396 if (T.hasQualifiers())
397 T = T.getUnqualifiedType();
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000398
399 ExprResult Res = Owned(ImplicitCastExpr::Create(Context, T, CK_LValueToRValue,
400 E, 0, VK_RValue));
401
402 return Res;
John McCall409fa9a2010-12-06 20:48:59 +0000403}
404
John Wiegley429bb272011-04-08 18:41:53 +0000405ExprResult Sema::DefaultFunctionArrayLvalueConversion(Expr *E) {
406 ExprResult Res = DefaultFunctionArrayConversion(E);
407 if (Res.isInvalid())
408 return ExprError();
409 Res = DefaultLvalueConversion(Res.take());
410 if (Res.isInvalid())
411 return ExprError();
412 return move(Res);
Douglas Gregora873dfc2010-02-03 00:27:59 +0000413}
414
415
Chris Lattnere7a2e912008-07-25 21:10:04 +0000416/// UsualUnaryConversions - Performs various conversions that are common to most
Mike Stump1eb44332009-09-09 15:08:12 +0000417/// operators (C99 6.3). The conversions of array and function types are
Chris Lattnerfc8f0e12011-04-15 05:22:18 +0000418/// sometimes suppressed. For example, the array->pointer conversion doesn't
Chris Lattnere7a2e912008-07-25 21:10:04 +0000419/// apply if the array is an argument to the sizeof or address (&) operators.
420/// In these instances, this routine should *not* be called.
John Wiegley429bb272011-04-08 18:41:53 +0000421ExprResult Sema::UsualUnaryConversions(Expr *E) {
John McCall0ae287a2010-12-01 04:43:34 +0000422 // First, convert to an r-value.
John Wiegley429bb272011-04-08 18:41:53 +0000423 ExprResult Res = DefaultFunctionArrayLvalueConversion(E);
424 if (Res.isInvalid())
425 return Owned(E);
426 E = Res.take();
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000427
John McCall0ae287a2010-12-01 04:43:34 +0000428 QualType Ty = E->getType();
Chris Lattnere7a2e912008-07-25 21:10:04 +0000429 assert(!Ty.isNull() && "UsualUnaryConversions - missing type");
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000430
431 // Half FP is a bit different: it's a storage-only type, meaning that any
432 // "use" of it should be promoted to float.
433 if (Ty->isHalfType())
434 return ImpCastExprToType(Res.take(), Context.FloatTy, CK_FloatingCast);
435
John McCall0ae287a2010-12-01 04:43:34 +0000436 // Try to perform integral promotions if the object has a theoretically
437 // promotable type.
438 if (Ty->isIntegralOrUnscopedEnumerationType()) {
439 // C99 6.3.1.1p2:
440 //
441 // The following may be used in an expression wherever an int or
442 // unsigned int may be used:
443 // - an object or expression with an integer type whose integer
444 // conversion rank is less than or equal to the rank of int
445 // and unsigned int.
446 // - A bit-field of type _Bool, int, signed int, or unsigned int.
447 //
448 // If an int can represent all values of the original type, the
449 // value is converted to an int; otherwise, it is converted to an
450 // unsigned int. These are called the integer promotions. All
451 // other types are unchanged by the integer promotions.
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000452
John McCall0ae287a2010-12-01 04:43:34 +0000453 QualType PTy = Context.isPromotableBitField(E);
454 if (!PTy.isNull()) {
John Wiegley429bb272011-04-08 18:41:53 +0000455 E = ImpCastExprToType(E, PTy, CK_IntegralCast).take();
456 return Owned(E);
John McCall0ae287a2010-12-01 04:43:34 +0000457 }
458 if (Ty->isPromotableIntegerType()) {
459 QualType PT = Context.getPromotedIntegerType(Ty);
John Wiegley429bb272011-04-08 18:41:53 +0000460 E = ImpCastExprToType(E, PT, CK_IntegralCast).take();
461 return Owned(E);
John McCall0ae287a2010-12-01 04:43:34 +0000462 }
Eli Friedman04e83572009-08-20 04:21:42 +0000463 }
John Wiegley429bb272011-04-08 18:41:53 +0000464 return Owned(E);
Chris Lattnere7a2e912008-07-25 21:10:04 +0000465}
466
Chris Lattner05faf172008-07-25 22:25:12 +0000467/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
Mike Stump1eb44332009-09-09 15:08:12 +0000468/// do not have a prototype. Arguments that have type float are promoted to
Chris Lattner05faf172008-07-25 22:25:12 +0000469/// double. All other argument types are converted by UsualUnaryConversions().
John Wiegley429bb272011-04-08 18:41:53 +0000470ExprResult Sema::DefaultArgumentPromotion(Expr *E) {
471 QualType Ty = E->getType();
Chris Lattner05faf172008-07-25 22:25:12 +0000472 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type");
Mike Stump1eb44332009-09-09 15:08:12 +0000473
John Wiegley429bb272011-04-08 18:41:53 +0000474 ExprResult Res = UsualUnaryConversions(E);
475 if (Res.isInvalid())
476 return Owned(E);
477 E = Res.take();
John McCall40c29132010-12-06 18:36:11 +0000478
Chris Lattner05faf172008-07-25 22:25:12 +0000479 // If this is a 'float' (CVR qualified or typedef) promote to double.
Chris Lattner40378332010-05-16 04:01:30 +0000480 if (Ty->isSpecificBuiltinType(BuiltinType::Float))
John Wiegley429bb272011-04-08 18:41:53 +0000481 E = ImpCastExprToType(E, Context.DoubleTy, CK_FloatingCast).take();
482
John McCall96a914a2011-08-27 22:06:17 +0000483 // C++ performs lvalue-to-rvalue conversion as a default argument
John McCall709bca82011-08-29 23:55:37 +0000484 // promotion, even on class types, but note:
485 // C++11 [conv.lval]p2:
486 // When an lvalue-to-rvalue conversion occurs in an unevaluated
487 // operand or a subexpression thereof the value contained in the
488 // referenced object is not accessed. Otherwise, if the glvalue
489 // has a class type, the conversion copy-initializes a temporary
490 // of type T from the glvalue and the result of the conversion
491 // is a prvalue for the temporary.
492 // FIXME: add some way to gate this entire thing for correctness in
493 // potentially potentially evaluated contexts.
John McCall96a914a2011-08-27 22:06:17 +0000494 if (getLangOptions().CPlusPlus && E->isGLValue() &&
495 ExprEvalContexts.back().Context != Unevaluated) {
John McCall5f8d6042011-08-27 01:09:30 +0000496 ExprResult Temp = PerformCopyInitialization(
497 InitializedEntity::InitializeTemporary(E->getType()),
498 E->getExprLoc(),
499 Owned(E));
500 if (Temp.isInvalid())
501 return ExprError();
502 E = Temp.get();
503 }
504
John Wiegley429bb272011-04-08 18:41:53 +0000505 return Owned(E);
Chris Lattner05faf172008-07-25 22:25:12 +0000506}
507
Chris Lattner312531a2009-04-12 08:11:20 +0000508/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
509/// will warn if the resulting type is not a POD type, and rejects ObjC
John Wiegley429bb272011-04-08 18:41:53 +0000510/// interfaces passed by value.
511ExprResult Sema::DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT,
John McCallf85e1932011-06-15 23:02:42 +0000512 FunctionDecl *FDecl) {
John McCall5acb0c92011-10-17 18:40:02 +0000513 if (const BuiltinType *PlaceholderTy = E->getType()->getAsPlaceholderType()) {
514 // Strip the unbridged-cast placeholder expression off, if applicable.
515 if (PlaceholderTy->getKind() == BuiltinType::ARCUnbridgedCast &&
516 (CT == VariadicMethod ||
517 (FDecl && FDecl->hasAttr<CFAuditedTransferAttr>()))) {
518 E = stripARCUnbridgedCast(E);
519
520 // Otherwise, do normal placeholder checking.
521 } else {
522 ExprResult ExprRes = CheckPlaceholderExpr(E);
523 if (ExprRes.isInvalid())
524 return ExprError();
525 E = ExprRes.take();
526 }
527 }
Douglas Gregor8d5e18c2011-06-17 00:15:10 +0000528
John McCall5acb0c92011-10-17 18:40:02 +0000529 ExprResult ExprRes = DefaultArgumentPromotion(E);
John Wiegley429bb272011-04-08 18:41:53 +0000530 if (ExprRes.isInvalid())
531 return ExprError();
532 E = ExprRes.take();
Mike Stump1eb44332009-09-09 15:08:12 +0000533
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000534 // Don't allow one to pass an Objective-C interface to a vararg.
John Wiegley429bb272011-04-08 18:41:53 +0000535 if (E->getType()->isObjCObjectType() &&
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000536 DiagRuntimeBehavior(E->getLocStart(), 0,
537 PDiag(diag::err_cannot_pass_objc_interface_to_vararg)
538 << E->getType() << CT))
John Wiegley429bb272011-04-08 18:41:53 +0000539 return ExprError();
John McCall5f8d6042011-08-27 01:09:30 +0000540
Douglas Gregorb8e778d2011-10-14 20:34:19 +0000541 // Complain about passing non-POD types through varargs. However, don't
542 // perform this check for incomplete types, which we can get here when we're
543 // in an unevaluated context.
544 if (!E->getType()->isIncompleteType() && !E->getType().isPODType(Context)) {
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000545 // C++0x [expr.call]p7:
546 // Passing a potentially-evaluated argument of class type (Clause 9)
547 // having a non-trivial copy constructor, a non-trivial move constructor,
548 // or a non-trivial destructor, with no corresponding parameter,
549 // is conditionally-supported with implementation-defined semantics.
550 bool TrivialEnough = false;
551 if (getLangOptions().CPlusPlus0x && !E->getType()->isDependentType()) {
552 if (CXXRecordDecl *Record = E->getType()->getAsCXXRecordDecl()) {
553 if (Record->hasTrivialCopyConstructor() &&
554 Record->hasTrivialMoveConstructor() &&
Richard Smithebaf0e62011-10-18 20:49:44 +0000555 Record->hasTrivialDestructor()) {
556 DiagRuntimeBehavior(E->getLocStart(), 0,
557 PDiag(diag::warn_cxx98_compat_pass_non_pod_arg_to_vararg)
558 << E->getType() << CT);
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000559 TrivialEnough = true;
Richard Smithebaf0e62011-10-18 20:49:44 +0000560 }
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000561 }
562 }
John McCallf85e1932011-06-15 23:02:42 +0000563
564 if (!TrivialEnough &&
565 getLangOptions().ObjCAutoRefCount &&
566 E->getType()->isObjCLifetimeType())
567 TrivialEnough = true;
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000568
569 if (TrivialEnough) {
570 // Nothing to diagnose. This is okay.
571 } else if (DiagRuntimeBehavior(E->getLocStart(), 0,
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +0000572 PDiag(diag::warn_cannot_pass_non_pod_arg_to_vararg)
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000573 << getLangOptions().CPlusPlus0x << E->getType()
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000574 << CT)) {
575 // Turn this into a trap.
576 CXXScopeSpec SS;
577 UnqualifiedId Name;
578 Name.setIdentifier(PP.getIdentifierInfo("__builtin_trap"),
579 E->getLocStart());
580 ExprResult TrapFn = ActOnIdExpression(TUScope, SS, Name, true, false);
581 if (TrapFn.isInvalid())
582 return ExprError();
583
584 ExprResult Call = ActOnCallExpr(TUScope, TrapFn.get(), E->getLocStart(),
585 MultiExprArg(), E->getLocEnd());
586 if (Call.isInvalid())
587 return ExprError();
588
589 ExprResult Comma = ActOnBinOp(TUScope, E->getLocStart(), tok::comma,
590 Call.get(), E);
591 if (Comma.isInvalid())
John McCall66c20302011-08-26 18:41:18 +0000592 return ExprError();
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000593 E = Comma.get();
594 }
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000595 }
596
John Wiegley429bb272011-04-08 18:41:53 +0000597 return Owned(E);
Anders Carlssondce5e2c2009-01-16 16:48:51 +0000598}
599
Richard Trieu8289f492011-09-02 20:58:51 +0000600/// \brief Converts an integer to complex float type. Helper function of
601/// UsualArithmeticConversions()
602///
603/// \return false if the integer expression is an integer type and is
604/// successfully converted to the complex type.
Richard Trieuccd891a2011-09-09 01:45:06 +0000605static bool handleIntegerToComplexFloatConversion(Sema &S, ExprResult &IntExpr,
606 ExprResult &ComplexExpr,
607 QualType IntTy,
608 QualType ComplexTy,
609 bool SkipCast) {
610 if (IntTy->isComplexType() || IntTy->isRealFloatingType()) return true;
611 if (SkipCast) return false;
612 if (IntTy->isIntegerType()) {
613 QualType fpTy = cast<ComplexType>(ComplexTy)->getElementType();
614 IntExpr = S.ImpCastExprToType(IntExpr.take(), fpTy, CK_IntegralToFloating);
615 IntExpr = S.ImpCastExprToType(IntExpr.take(), ComplexTy,
Richard Trieu8289f492011-09-02 20:58:51 +0000616 CK_FloatingRealToComplex);
617 } else {
Richard Trieuccd891a2011-09-09 01:45:06 +0000618 assert(IntTy->isComplexIntegerType());
619 IntExpr = S.ImpCastExprToType(IntExpr.take(), ComplexTy,
Richard Trieu8289f492011-09-02 20:58:51 +0000620 CK_IntegralComplexToFloatingComplex);
621 }
622 return false;
623}
624
625/// \brief Takes two complex float types and converts them to the same type.
626/// Helper function of UsualArithmeticConversions()
627static QualType
Richard Trieucafd30b2011-09-06 18:25:09 +0000628handleComplexFloatToComplexFloatConverstion(Sema &S, ExprResult &LHS,
629 ExprResult &RHS, QualType LHSType,
630 QualType RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000631 bool IsCompAssign) {
Richard Trieucafd30b2011-09-06 18:25:09 +0000632 int order = S.Context.getFloatingTypeOrder(LHSType, RHSType);
Richard Trieu8289f492011-09-02 20:58:51 +0000633
634 if (order < 0) {
635 // _Complex float -> _Complex double
Richard Trieuccd891a2011-09-09 01:45:06 +0000636 if (!IsCompAssign)
Richard Trieucafd30b2011-09-06 18:25:09 +0000637 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_FloatingComplexCast);
638 return RHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000639 }
640 if (order > 0)
641 // _Complex float -> _Complex double
Richard Trieucafd30b2011-09-06 18:25:09 +0000642 RHS = S.ImpCastExprToType(RHS.take(), LHSType, CK_FloatingComplexCast);
643 return LHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000644}
645
646/// \brief Converts otherExpr to complex float and promotes complexExpr if
647/// necessary. Helper function of UsualArithmeticConversions()
648static QualType handleOtherComplexFloatConversion(Sema &S,
Richard Trieuccd891a2011-09-09 01:45:06 +0000649 ExprResult &ComplexExpr,
650 ExprResult &OtherExpr,
651 QualType ComplexTy,
652 QualType OtherTy,
653 bool ConvertComplexExpr,
654 bool ConvertOtherExpr) {
655 int order = S.Context.getFloatingTypeOrder(ComplexTy, OtherTy);
Richard Trieu8289f492011-09-02 20:58:51 +0000656
657 // If just the complexExpr is complex, the otherExpr needs to be converted,
658 // and the complexExpr might need to be promoted.
659 if (order > 0) { // complexExpr is wider
660 // float -> _Complex double
Richard Trieuccd891a2011-09-09 01:45:06 +0000661 if (ConvertOtherExpr) {
662 QualType fp = cast<ComplexType>(ComplexTy)->getElementType();
663 OtherExpr = S.ImpCastExprToType(OtherExpr.take(), fp, CK_FloatingCast);
664 OtherExpr = S.ImpCastExprToType(OtherExpr.take(), ComplexTy,
Richard Trieu8289f492011-09-02 20:58:51 +0000665 CK_FloatingRealToComplex);
666 }
Richard Trieuccd891a2011-09-09 01:45:06 +0000667 return ComplexTy;
Richard Trieu8289f492011-09-02 20:58:51 +0000668 }
669
670 // otherTy is at least as wide. Find its corresponding complex type.
Richard Trieuccd891a2011-09-09 01:45:06 +0000671 QualType result = (order == 0 ? ComplexTy :
672 S.Context.getComplexType(OtherTy));
Richard Trieu8289f492011-09-02 20:58:51 +0000673
674 // double -> _Complex double
Richard Trieuccd891a2011-09-09 01:45:06 +0000675 if (ConvertOtherExpr)
676 OtherExpr = S.ImpCastExprToType(OtherExpr.take(), result,
Richard Trieu8289f492011-09-02 20:58:51 +0000677 CK_FloatingRealToComplex);
678
679 // _Complex float -> _Complex double
Richard Trieuccd891a2011-09-09 01:45:06 +0000680 if (ConvertComplexExpr && order < 0)
681 ComplexExpr = S.ImpCastExprToType(ComplexExpr.take(), result,
Richard Trieu8289f492011-09-02 20:58:51 +0000682 CK_FloatingComplexCast);
683
684 return result;
685}
686
687/// \brief Handle arithmetic conversion with complex types. Helper function of
688/// UsualArithmeticConversions()
Richard Trieucafd30b2011-09-06 18:25:09 +0000689static QualType handleComplexFloatConversion(Sema &S, ExprResult &LHS,
690 ExprResult &RHS, QualType LHSType,
691 QualType RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000692 bool IsCompAssign) {
Richard Trieu8289f492011-09-02 20:58:51 +0000693 // if we have an integer operand, the result is the complex type.
Richard Trieucafd30b2011-09-06 18:25:09 +0000694 if (!handleIntegerToComplexFloatConversion(S, RHS, LHS, RHSType, LHSType,
Richard Trieu8289f492011-09-02 20:58:51 +0000695 /*skipCast*/false))
Richard Trieucafd30b2011-09-06 18:25:09 +0000696 return LHSType;
697 if (!handleIntegerToComplexFloatConversion(S, LHS, RHS, LHSType, RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000698 /*skipCast*/IsCompAssign))
Richard Trieucafd30b2011-09-06 18:25:09 +0000699 return RHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000700
701 // This handles complex/complex, complex/float, or float/complex.
702 // When both operands are complex, the shorter operand is converted to the
703 // type of the longer, and that is the type of the result. This corresponds
704 // to what is done when combining two real floating-point operands.
705 // The fun begins when size promotion occur across type domains.
706 // From H&S 6.3.4: When one operand is complex and the other is a real
707 // floating-point type, the less precise type is converted, within it's
708 // real or complex domain, to the precision of the other type. For example,
709 // when combining a "long double" with a "double _Complex", the
710 // "double _Complex" is promoted to "long double _Complex".
711
Richard Trieucafd30b2011-09-06 18:25:09 +0000712 bool LHSComplexFloat = LHSType->isComplexType();
713 bool RHSComplexFloat = RHSType->isComplexType();
Richard Trieu8289f492011-09-02 20:58:51 +0000714
715 // If both are complex, just cast to the more precise type.
716 if (LHSComplexFloat && RHSComplexFloat)
Richard Trieucafd30b2011-09-06 18:25:09 +0000717 return handleComplexFloatToComplexFloatConverstion(S, LHS, RHS,
718 LHSType, RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000719 IsCompAssign);
Richard Trieu8289f492011-09-02 20:58:51 +0000720
721 // If only one operand is complex, promote it if necessary and convert the
722 // other operand to complex.
723 if (LHSComplexFloat)
724 return handleOtherComplexFloatConversion(
Richard Trieuccd891a2011-09-09 01:45:06 +0000725 S, LHS, RHS, LHSType, RHSType, /*convertComplexExpr*/!IsCompAssign,
Richard Trieu8289f492011-09-02 20:58:51 +0000726 /*convertOtherExpr*/ true);
727
728 assert(RHSComplexFloat);
729 return handleOtherComplexFloatConversion(
Richard Trieucafd30b2011-09-06 18:25:09 +0000730 S, RHS, LHS, RHSType, LHSType, /*convertComplexExpr*/true,
Richard Trieuccd891a2011-09-09 01:45:06 +0000731 /*convertOtherExpr*/ !IsCompAssign);
Richard Trieu8289f492011-09-02 20:58:51 +0000732}
733
734/// \brief Hande arithmetic conversion from integer to float. Helper function
735/// of UsualArithmeticConversions()
Richard Trieuccd891a2011-09-09 01:45:06 +0000736static QualType handleIntToFloatConversion(Sema &S, ExprResult &FloatExpr,
737 ExprResult &IntExpr,
738 QualType FloatTy, QualType IntTy,
739 bool ConvertFloat, bool ConvertInt) {
740 if (IntTy->isIntegerType()) {
741 if (ConvertInt)
Richard Trieu8289f492011-09-02 20:58:51 +0000742 // Convert intExpr to the lhs floating point type.
Richard Trieuccd891a2011-09-09 01:45:06 +0000743 IntExpr = S.ImpCastExprToType(IntExpr.take(), FloatTy,
Richard Trieu8289f492011-09-02 20:58:51 +0000744 CK_IntegralToFloating);
Richard Trieuccd891a2011-09-09 01:45:06 +0000745 return FloatTy;
Richard Trieu8289f492011-09-02 20:58:51 +0000746 }
747
748 // Convert both sides to the appropriate complex float.
Richard Trieuccd891a2011-09-09 01:45:06 +0000749 assert(IntTy->isComplexIntegerType());
750 QualType result = S.Context.getComplexType(FloatTy);
Richard Trieu8289f492011-09-02 20:58:51 +0000751
752 // _Complex int -> _Complex float
Richard Trieuccd891a2011-09-09 01:45:06 +0000753 if (ConvertInt)
754 IntExpr = S.ImpCastExprToType(IntExpr.take(), result,
Richard Trieu8289f492011-09-02 20:58:51 +0000755 CK_IntegralComplexToFloatingComplex);
756
757 // float -> _Complex float
Richard Trieuccd891a2011-09-09 01:45:06 +0000758 if (ConvertFloat)
759 FloatExpr = S.ImpCastExprToType(FloatExpr.take(), result,
Richard Trieu8289f492011-09-02 20:58:51 +0000760 CK_FloatingRealToComplex);
761
762 return result;
763}
764
765/// \brief Handle arithmethic conversion with floating point types. Helper
766/// function of UsualArithmeticConversions()
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000767static QualType handleFloatConversion(Sema &S, ExprResult &LHS,
768 ExprResult &RHS, QualType LHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000769 QualType RHSType, bool IsCompAssign) {
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000770 bool LHSFloat = LHSType->isRealFloatingType();
771 bool RHSFloat = RHSType->isRealFloatingType();
Richard Trieu8289f492011-09-02 20:58:51 +0000772
773 // If we have two real floating types, convert the smaller operand
774 // to the bigger result.
775 if (LHSFloat && RHSFloat) {
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000776 int order = S.Context.getFloatingTypeOrder(LHSType, RHSType);
Richard Trieu8289f492011-09-02 20:58:51 +0000777 if (order > 0) {
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000778 RHS = S.ImpCastExprToType(RHS.take(), LHSType, CK_FloatingCast);
779 return LHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000780 }
781
782 assert(order < 0 && "illegal float comparison");
Richard Trieuccd891a2011-09-09 01:45:06 +0000783 if (!IsCompAssign)
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000784 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_FloatingCast);
785 return RHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000786 }
787
788 if (LHSFloat)
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000789 return handleIntToFloatConversion(S, LHS, RHS, LHSType, RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000790 /*convertFloat=*/!IsCompAssign,
Richard Trieu8289f492011-09-02 20:58:51 +0000791 /*convertInt=*/ true);
792 assert(RHSFloat);
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000793 return handleIntToFloatConversion(S, RHS, LHS, RHSType, LHSType,
Richard Trieu8289f492011-09-02 20:58:51 +0000794 /*convertInt=*/ true,
Richard Trieuccd891a2011-09-09 01:45:06 +0000795 /*convertFloat=*/!IsCompAssign);
Richard Trieu8289f492011-09-02 20:58:51 +0000796}
797
798/// \brief Handle conversions with GCC complex int extension. Helper function
Benjamin Kramer5cc86802011-09-06 19:57:14 +0000799/// of UsualArithmeticConversions()
Richard Trieu8289f492011-09-02 20:58:51 +0000800// FIXME: if the operands are (int, _Complex long), we currently
801// don't promote the complex. Also, signedness?
Benjamin Kramer5cc86802011-09-06 19:57:14 +0000802static QualType handleComplexIntConversion(Sema &S, ExprResult &LHS,
803 ExprResult &RHS, QualType LHSType,
804 QualType RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000805 bool IsCompAssign) {
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000806 const ComplexType *LHSComplexInt = LHSType->getAsComplexIntegerType();
807 const ComplexType *RHSComplexInt = RHSType->getAsComplexIntegerType();
Richard Trieu8289f492011-09-02 20:58:51 +0000808
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000809 if (LHSComplexInt && RHSComplexInt) {
810 int order = S.Context.getIntegerTypeOrder(LHSComplexInt->getElementType(),
811 RHSComplexInt->getElementType());
Richard Trieu8289f492011-09-02 20:58:51 +0000812 assert(order && "inequal types with equal element ordering");
813 if (order > 0) {
814 // _Complex int -> _Complex long
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000815 RHS = S.ImpCastExprToType(RHS.take(), LHSType, CK_IntegralComplexCast);
816 return LHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000817 }
818
Richard Trieuccd891a2011-09-09 01:45:06 +0000819 if (!IsCompAssign)
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000820 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_IntegralComplexCast);
821 return RHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000822 }
823
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000824 if (LHSComplexInt) {
Richard Trieu8289f492011-09-02 20:58:51 +0000825 // int -> _Complex int
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000826 RHS = S.ImpCastExprToType(RHS.take(), LHSType, CK_IntegralRealToComplex);
827 return LHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000828 }
829
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000830 assert(RHSComplexInt);
Richard Trieu8289f492011-09-02 20:58:51 +0000831 // int -> _Complex int
Richard Trieuccd891a2011-09-09 01:45:06 +0000832 if (!IsCompAssign)
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000833 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_IntegralRealToComplex);
834 return RHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000835}
836
837/// \brief Handle integer arithmetic conversions. Helper function of
838/// UsualArithmeticConversions()
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000839static QualType handleIntegerConversion(Sema &S, ExprResult &LHS,
840 ExprResult &RHS, QualType LHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000841 QualType RHSType, bool IsCompAssign) {
Richard Trieu8289f492011-09-02 20:58:51 +0000842 // The rules for this case are in C99 6.3.1.8
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000843 int order = S.Context.getIntegerTypeOrder(LHSType, RHSType);
844 bool LHSSigned = LHSType->hasSignedIntegerRepresentation();
845 bool RHSSigned = RHSType->hasSignedIntegerRepresentation();
846 if (LHSSigned == RHSSigned) {
Richard Trieu8289f492011-09-02 20:58:51 +0000847 // Same signedness; use the higher-ranked type
848 if (order >= 0) {
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000849 RHS = S.ImpCastExprToType(RHS.take(), LHSType, CK_IntegralCast);
850 return LHSType;
Richard Trieuccd891a2011-09-09 01:45:06 +0000851 } else if (!IsCompAssign)
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000852 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_IntegralCast);
853 return RHSType;
854 } else if (order != (LHSSigned ? 1 : -1)) {
Richard Trieu8289f492011-09-02 20:58:51 +0000855 // The unsigned type has greater than or equal rank to the
856 // signed type, so use the unsigned type
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000857 if (RHSSigned) {
858 RHS = S.ImpCastExprToType(RHS.take(), LHSType, CK_IntegralCast);
859 return LHSType;
Richard Trieuccd891a2011-09-09 01:45:06 +0000860 } else if (!IsCompAssign)
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000861 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_IntegralCast);
862 return RHSType;
863 } else if (S.Context.getIntWidth(LHSType) != S.Context.getIntWidth(RHSType)) {
Richard Trieu8289f492011-09-02 20:58:51 +0000864 // The two types are different widths; if we are here, that
865 // means the signed type is larger than the unsigned type, so
866 // use the signed type.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000867 if (LHSSigned) {
868 RHS = S.ImpCastExprToType(RHS.take(), LHSType, CK_IntegralCast);
869 return LHSType;
Richard Trieuccd891a2011-09-09 01:45:06 +0000870 } else if (!IsCompAssign)
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000871 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_IntegralCast);
872 return RHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000873 } else {
874 // The signed type is higher-ranked than the unsigned type,
875 // but isn't actually any bigger (like unsigned int and long
876 // on most 32-bit systems). Use the unsigned type corresponding
877 // to the signed type.
878 QualType result =
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000879 S.Context.getCorrespondingUnsignedType(LHSSigned ? LHSType : RHSType);
880 RHS = S.ImpCastExprToType(RHS.take(), result, CK_IntegralCast);
Richard Trieuccd891a2011-09-09 01:45:06 +0000881 if (!IsCompAssign)
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000882 LHS = S.ImpCastExprToType(LHS.take(), result, CK_IntegralCast);
Richard Trieu8289f492011-09-02 20:58:51 +0000883 return result;
884 }
885}
886
Chris Lattnere7a2e912008-07-25 21:10:04 +0000887/// UsualArithmeticConversions - Performs various conversions that are common to
888/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this
Mike Stump1eb44332009-09-09 15:08:12 +0000889/// routine returns the first non-arithmetic type found. The client is
Chris Lattnere7a2e912008-07-25 21:10:04 +0000890/// responsible for emitting appropriate error diagnostics.
891/// FIXME: verify the conversion rules for "complex int" are consistent with
892/// GCC.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000893QualType Sema::UsualArithmeticConversions(ExprResult &LHS, ExprResult &RHS,
Richard Trieuccd891a2011-09-09 01:45:06 +0000894 bool IsCompAssign) {
895 if (!IsCompAssign) {
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000896 LHS = UsualUnaryConversions(LHS.take());
897 if (LHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +0000898 return QualType();
899 }
Eli Friedmanab3a8522009-03-28 01:22:36 +0000900
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000901 RHS = UsualUnaryConversions(RHS.take());
902 if (RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +0000903 return QualType();
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000904
Mike Stump1eb44332009-09-09 15:08:12 +0000905 // For conversion purposes, we ignore any qualifiers.
Chris Lattnere7a2e912008-07-25 21:10:04 +0000906 // For example, "const float" and "float" are equivalent.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000907 QualType LHSType =
908 Context.getCanonicalType(LHS.get()->getType()).getUnqualifiedType();
909 QualType RHSType =
910 Context.getCanonicalType(RHS.get()->getType()).getUnqualifiedType();
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000911
912 // If both types are identical, no conversion is needed.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000913 if (LHSType == RHSType)
914 return LHSType;
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000915
916 // If either side is a non-arithmetic type (e.g. a pointer), we are done.
917 // The caller can deal with this (e.g. pointer + int).
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000918 if (!LHSType->isArithmeticType() || !RHSType->isArithmeticType())
919 return LHSType;
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000920
John McCallcf33b242010-11-13 08:17:45 +0000921 // Apply unary and bitfield promotions to the LHS's type.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000922 QualType LHSUnpromotedType = LHSType;
923 if (LHSType->isPromotableIntegerType())
924 LHSType = Context.getPromotedIntegerType(LHSType);
925 QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(LHS.get());
Douglas Gregor2d833e32009-05-02 00:36:19 +0000926 if (!LHSBitfieldPromoteTy.isNull())
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000927 LHSType = LHSBitfieldPromoteTy;
Richard Trieuccd891a2011-09-09 01:45:06 +0000928 if (LHSType != LHSUnpromotedType && !IsCompAssign)
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000929 LHS = ImpCastExprToType(LHS.take(), LHSType, CK_IntegralCast);
Douglas Gregor2d833e32009-05-02 00:36:19 +0000930
John McCallcf33b242010-11-13 08:17:45 +0000931 // If both types are identical, no conversion is needed.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000932 if (LHSType == RHSType)
933 return LHSType;
John McCallcf33b242010-11-13 08:17:45 +0000934
935 // At this point, we have two different arithmetic types.
936
937 // Handle complex types first (C99 6.3.1.8p1).
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000938 if (LHSType->isComplexType() || RHSType->isComplexType())
939 return handleComplexFloatConversion(*this, LHS, RHS, LHSType, RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000940 IsCompAssign);
John McCallcf33b242010-11-13 08:17:45 +0000941
942 // Now handle "real" floating types (i.e. float, double, long double).
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000943 if (LHSType->isRealFloatingType() || RHSType->isRealFloatingType())
944 return handleFloatConversion(*this, LHS, RHS, LHSType, RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000945 IsCompAssign);
John McCallcf33b242010-11-13 08:17:45 +0000946
947 // Handle GCC complex int extension.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000948 if (LHSType->isComplexIntegerType() || RHSType->isComplexIntegerType())
Benjamin Kramer5cc86802011-09-06 19:57:14 +0000949 return handleComplexIntConversion(*this, LHS, RHS, LHSType, RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000950 IsCompAssign);
John McCallcf33b242010-11-13 08:17:45 +0000951
952 // Finally, we have two differing integer types.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000953 return handleIntegerConversion(*this, LHS, RHS, LHSType, RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000954 IsCompAssign);
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000955}
956
Chris Lattnere7a2e912008-07-25 21:10:04 +0000957//===----------------------------------------------------------------------===//
958// Semantic Analysis for various Expression Types
959//===----------------------------------------------------------------------===//
960
961
Peter Collingbournef111d932011-04-15 00:35:48 +0000962ExprResult
963Sema::ActOnGenericSelectionExpr(SourceLocation KeyLoc,
964 SourceLocation DefaultLoc,
965 SourceLocation RParenLoc,
966 Expr *ControllingExpr,
Richard Trieuccd891a2011-09-09 01:45:06 +0000967 MultiTypeArg ArgTypes,
968 MultiExprArg ArgExprs) {
969 unsigned NumAssocs = ArgTypes.size();
970 assert(NumAssocs == ArgExprs.size());
Peter Collingbournef111d932011-04-15 00:35:48 +0000971
Richard Trieuccd891a2011-09-09 01:45:06 +0000972 ParsedType *ParsedTypes = ArgTypes.release();
973 Expr **Exprs = ArgExprs.release();
Peter Collingbournef111d932011-04-15 00:35:48 +0000974
975 TypeSourceInfo **Types = new TypeSourceInfo*[NumAssocs];
976 for (unsigned i = 0; i < NumAssocs; ++i) {
977 if (ParsedTypes[i])
978 (void) GetTypeFromParser(ParsedTypes[i], &Types[i]);
979 else
980 Types[i] = 0;
981 }
982
983 ExprResult ER = CreateGenericSelectionExpr(KeyLoc, DefaultLoc, RParenLoc,
984 ControllingExpr, Types, Exprs,
985 NumAssocs);
Benjamin Kramer5bf47f72011-04-15 11:21:57 +0000986 delete [] Types;
Peter Collingbournef111d932011-04-15 00:35:48 +0000987 return ER;
988}
989
990ExprResult
991Sema::CreateGenericSelectionExpr(SourceLocation KeyLoc,
992 SourceLocation DefaultLoc,
993 SourceLocation RParenLoc,
994 Expr *ControllingExpr,
995 TypeSourceInfo **Types,
996 Expr **Exprs,
997 unsigned NumAssocs) {
998 bool TypeErrorFound = false,
999 IsResultDependent = ControllingExpr->isTypeDependent(),
1000 ContainsUnexpandedParameterPack
1001 = ControllingExpr->containsUnexpandedParameterPack();
1002
1003 for (unsigned i = 0; i < NumAssocs; ++i) {
1004 if (Exprs[i]->containsUnexpandedParameterPack())
1005 ContainsUnexpandedParameterPack = true;
1006
1007 if (Types[i]) {
1008 if (Types[i]->getType()->containsUnexpandedParameterPack())
1009 ContainsUnexpandedParameterPack = true;
1010
1011 if (Types[i]->getType()->isDependentType()) {
1012 IsResultDependent = true;
1013 } else {
1014 // C1X 6.5.1.1p2 "The type name in a generic association shall specify a
1015 // complete object type other than a variably modified type."
1016 unsigned D = 0;
1017 if (Types[i]->getType()->isIncompleteType())
1018 D = diag::err_assoc_type_incomplete;
1019 else if (!Types[i]->getType()->isObjectType())
1020 D = diag::err_assoc_type_nonobject;
1021 else if (Types[i]->getType()->isVariablyModifiedType())
1022 D = diag::err_assoc_type_variably_modified;
1023
1024 if (D != 0) {
1025 Diag(Types[i]->getTypeLoc().getBeginLoc(), D)
1026 << Types[i]->getTypeLoc().getSourceRange()
1027 << Types[i]->getType();
1028 TypeErrorFound = true;
1029 }
1030
1031 // C1X 6.5.1.1p2 "No two generic associations in the same generic
1032 // selection shall specify compatible types."
1033 for (unsigned j = i+1; j < NumAssocs; ++j)
1034 if (Types[j] && !Types[j]->getType()->isDependentType() &&
1035 Context.typesAreCompatible(Types[i]->getType(),
1036 Types[j]->getType())) {
1037 Diag(Types[j]->getTypeLoc().getBeginLoc(),
1038 diag::err_assoc_compatible_types)
1039 << Types[j]->getTypeLoc().getSourceRange()
1040 << Types[j]->getType()
1041 << Types[i]->getType();
1042 Diag(Types[i]->getTypeLoc().getBeginLoc(),
1043 diag::note_compat_assoc)
1044 << Types[i]->getTypeLoc().getSourceRange()
1045 << Types[i]->getType();
1046 TypeErrorFound = true;
1047 }
1048 }
1049 }
1050 }
1051 if (TypeErrorFound)
1052 return ExprError();
1053
1054 // If we determined that the generic selection is result-dependent, don't
1055 // try to compute the result expression.
1056 if (IsResultDependent)
1057 return Owned(new (Context) GenericSelectionExpr(
1058 Context, KeyLoc, ControllingExpr,
1059 Types, Exprs, NumAssocs, DefaultLoc,
1060 RParenLoc, ContainsUnexpandedParameterPack));
1061
Chris Lattner5f9e2722011-07-23 10:55:15 +00001062 SmallVector<unsigned, 1> CompatIndices;
Peter Collingbournef111d932011-04-15 00:35:48 +00001063 unsigned DefaultIndex = -1U;
1064 for (unsigned i = 0; i < NumAssocs; ++i) {
1065 if (!Types[i])
1066 DefaultIndex = i;
1067 else if (Context.typesAreCompatible(ControllingExpr->getType(),
1068 Types[i]->getType()))
1069 CompatIndices.push_back(i);
1070 }
1071
1072 // C1X 6.5.1.1p2 "The controlling expression of a generic selection shall have
1073 // type compatible with at most one of the types named in its generic
1074 // association list."
1075 if (CompatIndices.size() > 1) {
1076 // We strip parens here because the controlling expression is typically
1077 // parenthesized in macro definitions.
1078 ControllingExpr = ControllingExpr->IgnoreParens();
1079 Diag(ControllingExpr->getLocStart(), diag::err_generic_sel_multi_match)
1080 << ControllingExpr->getSourceRange() << ControllingExpr->getType()
1081 << (unsigned) CompatIndices.size();
Chris Lattner5f9e2722011-07-23 10:55:15 +00001082 for (SmallVector<unsigned, 1>::iterator I = CompatIndices.begin(),
Peter Collingbournef111d932011-04-15 00:35:48 +00001083 E = CompatIndices.end(); I != E; ++I) {
1084 Diag(Types[*I]->getTypeLoc().getBeginLoc(),
1085 diag::note_compat_assoc)
1086 << Types[*I]->getTypeLoc().getSourceRange()
1087 << Types[*I]->getType();
1088 }
1089 return ExprError();
1090 }
1091
1092 // C1X 6.5.1.1p2 "If a generic selection has no default generic association,
1093 // its controlling expression shall have type compatible with exactly one of
1094 // the types named in its generic association list."
1095 if (DefaultIndex == -1U && CompatIndices.size() == 0) {
1096 // We strip parens here because the controlling expression is typically
1097 // parenthesized in macro definitions.
1098 ControllingExpr = ControllingExpr->IgnoreParens();
1099 Diag(ControllingExpr->getLocStart(), diag::err_generic_sel_no_match)
1100 << ControllingExpr->getSourceRange() << ControllingExpr->getType();
1101 return ExprError();
1102 }
1103
1104 // C1X 6.5.1.1p3 "If a generic selection has a generic association with a
1105 // type name that is compatible with the type of the controlling expression,
1106 // then the result expression of the generic selection is the expression
1107 // in that generic association. Otherwise, the result expression of the
1108 // generic selection is the expression in the default generic association."
1109 unsigned ResultIndex =
1110 CompatIndices.size() ? CompatIndices[0] : DefaultIndex;
1111
1112 return Owned(new (Context) GenericSelectionExpr(
1113 Context, KeyLoc, ControllingExpr,
1114 Types, Exprs, NumAssocs, DefaultLoc,
1115 RParenLoc, ContainsUnexpandedParameterPack,
1116 ResultIndex));
1117}
1118
Steve Narofff69936d2007-09-16 03:34:24 +00001119/// ActOnStringLiteral - The specified tokens were lexed as pasted string
Reid Spencer5f016e22007-07-11 17:01:13 +00001120/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string
1121/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from
1122/// multiple tokens. However, the common case is that StringToks points to one
1123/// string.
Sebastian Redlcd965b92009-01-18 18:53:16 +00001124///
John McCall60d7b3a2010-08-24 06:29:42 +00001125ExprResult
Sean Hunt6cf75022010-08-30 17:47:05 +00001126Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) {
Reid Spencer5f016e22007-07-11 17:01:13 +00001127 assert(NumStringToks && "Must have at least one string!");
1128
Chris Lattnerbbee00b2009-01-16 18:51:42 +00001129 StringLiteralParser Literal(StringToks, NumStringToks, PP);
Reid Spencer5f016e22007-07-11 17:01:13 +00001130 if (Literal.hadError)
Sebastian Redlcd965b92009-01-18 18:53:16 +00001131 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00001132
Chris Lattner5f9e2722011-07-23 10:55:15 +00001133 SmallVector<SourceLocation, 4> StringTokLocs;
Reid Spencer5f016e22007-07-11 17:01:13 +00001134 for (unsigned i = 0; i != NumStringToks; ++i)
1135 StringTokLocs.push_back(StringToks[i].getLocation());
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001136
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001137 QualType StrTy = Context.CharTy;
Douglas Gregor5cee1192011-07-27 05:40:30 +00001138 if (Literal.isWide())
Anders Carlsson96b4adc2011-04-06 18:42:48 +00001139 StrTy = Context.getWCharType();
Douglas Gregor5cee1192011-07-27 05:40:30 +00001140 else if (Literal.isUTF16())
1141 StrTy = Context.Char16Ty;
1142 else if (Literal.isUTF32())
1143 StrTy = Context.Char32Ty;
Eli Friedman64f45a22011-11-01 02:23:42 +00001144 else if (Literal.isPascal())
Anders Carlsson96b4adc2011-04-06 18:42:48 +00001145 StrTy = Context.UnsignedCharTy;
Douglas Gregor77a52232008-09-12 00:47:35 +00001146
Douglas Gregor5cee1192011-07-27 05:40:30 +00001147 StringLiteral::StringKind Kind = StringLiteral::Ascii;
1148 if (Literal.isWide())
1149 Kind = StringLiteral::Wide;
1150 else if (Literal.isUTF8())
1151 Kind = StringLiteral::UTF8;
1152 else if (Literal.isUTF16())
1153 Kind = StringLiteral::UTF16;
1154 else if (Literal.isUTF32())
1155 Kind = StringLiteral::UTF32;
1156
Douglas Gregor77a52232008-09-12 00:47:35 +00001157 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
Chris Lattner7dc480f2010-06-15 18:05:34 +00001158 if (getLangOptions().CPlusPlus || getLangOptions().ConstStrings)
Douglas Gregor77a52232008-09-12 00:47:35 +00001159 StrTy.addConst();
Sebastian Redlcd965b92009-01-18 18:53:16 +00001160
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001161 // Get an array type for the string, according to C99 6.4.5. This includes
1162 // the nul terminator character as well as the string length for pascal
1163 // strings.
1164 StrTy = Context.getConstantArrayType(StrTy,
Chris Lattnerdbb1ecc2009-02-26 23:01:51 +00001165 llvm::APInt(32, Literal.GetNumStringChars()+1),
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001166 ArrayType::Normal, 0);
Mike Stump1eb44332009-09-09 15:08:12 +00001167
Reid Spencer5f016e22007-07-11 17:01:13 +00001168 // Pass &StringTokLocs[0], StringTokLocs.size() to factory!
Sean Hunt6cf75022010-08-30 17:47:05 +00001169 return Owned(StringLiteral::Create(Context, Literal.GetString(),
Douglas Gregor5cee1192011-07-27 05:40:30 +00001170 Kind, Literal.Pascal, StrTy,
Sean Hunt6cf75022010-08-30 17:47:05 +00001171 &StringTokLocs[0],
1172 StringTokLocs.size()));
Reid Spencer5f016e22007-07-11 17:01:13 +00001173}
1174
John McCall469a1eb2011-02-02 13:00:07 +00001175enum CaptureResult {
1176 /// No capture is required.
1177 CR_NoCapture,
1178
1179 /// A capture is required.
1180 CR_Capture,
1181
John McCall6b5a61b2011-02-07 10:33:21 +00001182 /// A by-ref capture is required.
1183 CR_CaptureByRef,
1184
John McCall469a1eb2011-02-02 13:00:07 +00001185 /// An error occurred when trying to capture the given variable.
1186 CR_Error
1187};
1188
1189/// Diagnose an uncapturable value reference.
Chris Lattner639e2d32008-10-20 05:16:36 +00001190///
John McCall469a1eb2011-02-02 13:00:07 +00001191/// \param var - the variable referenced
1192/// \param DC - the context which we couldn't capture through
1193static CaptureResult
John McCall6b5a61b2011-02-07 10:33:21 +00001194diagnoseUncapturableValueReference(Sema &S, SourceLocation loc,
John McCall469a1eb2011-02-02 13:00:07 +00001195 VarDecl *var, DeclContext *DC) {
1196 switch (S.ExprEvalContexts.back().Context) {
1197 case Sema::Unevaluated:
1198 // The argument will never be evaluated, so don't complain.
1199 return CR_NoCapture;
Mike Stump1eb44332009-09-09 15:08:12 +00001200
John McCall469a1eb2011-02-02 13:00:07 +00001201 case Sema::PotentiallyEvaluated:
1202 case Sema::PotentiallyEvaluatedIfUsed:
1203 break;
Chris Lattner639e2d32008-10-20 05:16:36 +00001204
John McCall469a1eb2011-02-02 13:00:07 +00001205 case Sema::PotentiallyPotentiallyEvaluated:
1206 // FIXME: delay these!
1207 break;
Chris Lattner17f3a6d2009-04-21 22:26:47 +00001208 }
Mike Stump1eb44332009-09-09 15:08:12 +00001209
John McCall469a1eb2011-02-02 13:00:07 +00001210 // Don't diagnose about capture if we're not actually in code right
1211 // now; in general, there are more appropriate places that will
1212 // diagnose this.
1213 if (!S.CurContext->isFunctionOrMethod()) return CR_NoCapture;
1214
John McCall4f38f412011-03-22 23:15:50 +00001215 // Certain madnesses can happen with parameter declarations, which
1216 // we want to ignore.
1217 if (isa<ParmVarDecl>(var)) {
1218 // - If the parameter still belongs to the translation unit, then
1219 // we're actually just using one parameter in the declaration of
1220 // the next. This is useful in e.g. VLAs.
1221 if (isa<TranslationUnitDecl>(var->getDeclContext()))
1222 return CR_NoCapture;
1223
1224 // - This particular madness can happen in ill-formed default
1225 // arguments; claim it's okay and let downstream code handle it.
1226 if (S.CurContext == var->getDeclContext()->getParent())
1227 return CR_NoCapture;
1228 }
John McCall469a1eb2011-02-02 13:00:07 +00001229
1230 DeclarationName functionName;
1231 if (FunctionDecl *fn = dyn_cast<FunctionDecl>(var->getDeclContext()))
1232 functionName = fn->getDeclName();
1233 // FIXME: variable from enclosing block that we couldn't capture from!
1234
1235 S.Diag(loc, diag::err_reference_to_local_var_in_enclosing_function)
1236 << var->getIdentifier() << functionName;
1237 S.Diag(var->getLocation(), diag::note_local_variable_declared_here)
1238 << var->getIdentifier();
1239
1240 return CR_Error;
Mike Stump1eb44332009-09-09 15:08:12 +00001241}
1242
John McCall6b5a61b2011-02-07 10:33:21 +00001243/// There is a well-formed capture at a particular scope level;
1244/// propagate it through all the nested blocks.
Richard Trieuccd891a2011-09-09 01:45:06 +00001245static CaptureResult propagateCapture(Sema &S, unsigned ValidScopeIndex,
1246 const BlockDecl::Capture &Capture) {
1247 VarDecl *var = Capture.getVariable();
John McCall6b5a61b2011-02-07 10:33:21 +00001248
1249 // Update all the inner blocks with the capture information.
Richard Trieuccd891a2011-09-09 01:45:06 +00001250 for (unsigned i = ValidScopeIndex + 1, e = S.FunctionScopes.size();
John McCall6b5a61b2011-02-07 10:33:21 +00001251 i != e; ++i) {
1252 BlockScopeInfo *innerBlock = cast<BlockScopeInfo>(S.FunctionScopes[i]);
1253 innerBlock->Captures.push_back(
Richard Trieuccd891a2011-09-09 01:45:06 +00001254 BlockDecl::Capture(Capture.getVariable(), Capture.isByRef(),
1255 /*nested*/ true, Capture.getCopyExpr()));
John McCall6b5a61b2011-02-07 10:33:21 +00001256 innerBlock->CaptureMap[var] = innerBlock->Captures.size(); // +1
1257 }
1258
Richard Trieuccd891a2011-09-09 01:45:06 +00001259 return Capture.isByRef() ? CR_CaptureByRef : CR_Capture;
John McCall6b5a61b2011-02-07 10:33:21 +00001260}
1261
1262/// shouldCaptureValueReference - Determine if a reference to the
John McCall469a1eb2011-02-02 13:00:07 +00001263/// given value in the current context requires a variable capture.
1264///
1265/// This also keeps the captures set in the BlockScopeInfo records
1266/// up-to-date.
John McCall6b5a61b2011-02-07 10:33:21 +00001267static CaptureResult shouldCaptureValueReference(Sema &S, SourceLocation loc,
Richard Trieuccd891a2011-09-09 01:45:06 +00001268 ValueDecl *Value) {
John McCall469a1eb2011-02-02 13:00:07 +00001269 // Only variables ever require capture.
Richard Trieuccd891a2011-09-09 01:45:06 +00001270 VarDecl *var = dyn_cast<VarDecl>(Value);
John McCall76a40212011-02-09 01:13:10 +00001271 if (!var) return CR_NoCapture;
John McCall469a1eb2011-02-02 13:00:07 +00001272
1273 // Fast path: variables from the current context never require capture.
1274 DeclContext *DC = S.CurContext;
1275 if (var->getDeclContext() == DC) return CR_NoCapture;
1276
1277 // Only variables with local storage require capture.
1278 // FIXME: What about 'const' variables in C++?
1279 if (!var->hasLocalStorage()) return CR_NoCapture;
1280
1281 // Otherwise, we need to capture.
1282
1283 unsigned functionScopesIndex = S.FunctionScopes.size() - 1;
John McCall469a1eb2011-02-02 13:00:07 +00001284 do {
1285 // Only blocks (and eventually C++0x closures) can capture; other
1286 // scopes don't work.
1287 if (!isa<BlockDecl>(DC))
John McCall6b5a61b2011-02-07 10:33:21 +00001288 return diagnoseUncapturableValueReference(S, loc, var, DC);
John McCall469a1eb2011-02-02 13:00:07 +00001289
1290 BlockScopeInfo *blockScope =
1291 cast<BlockScopeInfo>(S.FunctionScopes[functionScopesIndex]);
1292 assert(blockScope->TheDecl == static_cast<BlockDecl*>(DC));
1293
John McCall6b5a61b2011-02-07 10:33:21 +00001294 // Check whether we've already captured it in this block. If so,
1295 // we're done.
1296 if (unsigned indexPlus1 = blockScope->CaptureMap[var])
1297 return propagateCapture(S, functionScopesIndex,
1298 blockScope->Captures[indexPlus1 - 1]);
John McCall469a1eb2011-02-02 13:00:07 +00001299
1300 functionScopesIndex--;
1301 DC = cast<BlockDecl>(DC)->getDeclContext();
1302 } while (var->getDeclContext() != DC);
1303
John McCall6b5a61b2011-02-07 10:33:21 +00001304 // Okay, we descended all the way to the block that defines the variable.
1305 // Actually try to capture it.
1306 QualType type = var->getType();
Fariborz Jahanian05053212011-11-01 18:57:34 +00001307
John McCall6b5a61b2011-02-07 10:33:21 +00001308 // Prohibit variably-modified types.
1309 if (type->isVariablyModifiedType()) {
1310 S.Diag(loc, diag::err_ref_vm_type);
1311 S.Diag(var->getLocation(), diag::note_declared_at);
1312 return CR_Error;
1313 }
1314
1315 // Prohibit arrays, even in __block variables, but not references to
1316 // them.
1317 if (type->isArrayType()) {
1318 S.Diag(loc, diag::err_ref_array_type);
1319 S.Diag(var->getLocation(), diag::note_declared_at);
1320 return CR_Error;
1321 }
1322
1323 S.MarkDeclarationReferenced(loc, var);
1324
1325 // The BlocksAttr indicates the variable is bound by-reference.
1326 bool byRef = var->hasAttr<BlocksAttr>();
1327
1328 // Build a copy expression.
1329 Expr *copyExpr = 0;
John McCall642a75f2011-04-28 02:15:35 +00001330 const RecordType *rtype;
1331 if (!byRef && S.getLangOptions().CPlusPlus && !type->isDependentType() &&
1332 (rtype = type->getAs<RecordType>())) {
1333
1334 // The capture logic needs the destructor, so make sure we mark it.
1335 // Usually this is unnecessary because most local variables have
1336 // their destructors marked at declaration time, but parameters are
1337 // an exception because it's technically only the call site that
1338 // actually requires the destructor.
1339 if (isa<ParmVarDecl>(var))
1340 S.FinalizeVarWithDestructor(var, rtype);
1341
John McCall6b5a61b2011-02-07 10:33:21 +00001342 // According to the blocks spec, the capture of a variable from
1343 // the stack requires a const copy constructor. This is not true
1344 // of the copy/move done to move a __block variable to the heap.
1345 type.addConst();
1346
1347 Expr *declRef = new (S.Context) DeclRefExpr(var, type, VK_LValue, loc);
1348 ExprResult result =
1349 S.PerformCopyInitialization(
1350 InitializedEntity::InitializeBlock(var->getLocation(),
1351 type, false),
1352 loc, S.Owned(declRef));
1353
1354 // Build a full-expression copy expression if initialization
1355 // succeeded and used a non-trivial constructor. Recover from
1356 // errors by pretending that the copy isn't necessary.
1357 if (!result.isInvalid() &&
1358 !cast<CXXConstructExpr>(result.get())->getConstructor()->isTrivial()) {
1359 result = S.MaybeCreateExprWithCleanups(result);
1360 copyExpr = result.take();
1361 }
1362 }
1363
1364 // We're currently at the declarer; go back to the closure.
1365 functionScopesIndex++;
1366 BlockScopeInfo *blockScope =
1367 cast<BlockScopeInfo>(S.FunctionScopes[functionScopesIndex]);
1368
1369 // Build a valid capture in this scope.
1370 blockScope->Captures.push_back(
1371 BlockDecl::Capture(var, byRef, /*nested*/ false, copyExpr));
1372 blockScope->CaptureMap[var] = blockScope->Captures.size(); // +1
1373
1374 // Propagate that to inner captures if necessary.
1375 return propagateCapture(S, functionScopesIndex,
1376 blockScope->Captures.back());
1377}
1378
Richard Trieuccd891a2011-09-09 01:45:06 +00001379static ExprResult BuildBlockDeclRefExpr(Sema &S, ValueDecl *VD,
John McCall6b5a61b2011-02-07 10:33:21 +00001380 const DeclarationNameInfo &NameInfo,
Richard Trieuccd891a2011-09-09 01:45:06 +00001381 bool ByRef) {
1382 assert(isa<VarDecl>(VD) && "capturing non-variable");
John McCall6b5a61b2011-02-07 10:33:21 +00001383
Richard Trieuccd891a2011-09-09 01:45:06 +00001384 VarDecl *var = cast<VarDecl>(VD);
John McCall6b5a61b2011-02-07 10:33:21 +00001385 assert(var->hasLocalStorage() && "capturing non-local");
Richard Trieuccd891a2011-09-09 01:45:06 +00001386 assert(ByRef == var->hasAttr<BlocksAttr>() && "byref set wrong");
John McCall6b5a61b2011-02-07 10:33:21 +00001387
1388 QualType exprType = var->getType().getNonReferenceType();
1389
1390 BlockDeclRefExpr *BDRE;
Richard Trieuccd891a2011-09-09 01:45:06 +00001391 if (!ByRef) {
John McCall6b5a61b2011-02-07 10:33:21 +00001392 // The variable will be bound by copy; make it const within the
1393 // closure, but record that this was done in the expression.
1394 bool constAdded = !exprType.isConstQualified();
1395 exprType.addConst();
1396
1397 BDRE = new (S.Context) BlockDeclRefExpr(var, exprType, VK_LValue,
1398 NameInfo.getLoc(), false,
1399 constAdded);
1400 } else {
1401 BDRE = new (S.Context) BlockDeclRefExpr(var, exprType, VK_LValue,
1402 NameInfo.getLoc(), true);
1403 }
1404
1405 return S.Owned(BDRE);
John McCall469a1eb2011-02-02 13:00:07 +00001406}
Chris Lattner639e2d32008-10-20 05:16:36 +00001407
John McCall60d7b3a2010-08-24 06:29:42 +00001408ExprResult
John McCallf89e55a2010-11-18 06:31:45 +00001409Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
John McCall76a40212011-02-09 01:13:10 +00001410 SourceLocation Loc,
1411 const CXXScopeSpec *SS) {
Abramo Bagnara25777432010-08-11 22:01:17 +00001412 DeclarationNameInfo NameInfo(D->getDeclName(), Loc);
John McCallf89e55a2010-11-18 06:31:45 +00001413 return BuildDeclRefExpr(D, Ty, VK, NameInfo, SS);
Abramo Bagnara25777432010-08-11 22:01:17 +00001414}
1415
John McCall76a40212011-02-09 01:13:10 +00001416/// BuildDeclRefExpr - Build an expression that references a
1417/// declaration that does not require a closure capture.
John McCall60d7b3a2010-08-24 06:29:42 +00001418ExprResult
John McCall76a40212011-02-09 01:13:10 +00001419Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
Abramo Bagnara25777432010-08-11 22:01:17 +00001420 const DeclarationNameInfo &NameInfo,
1421 const CXXScopeSpec *SS) {
Peter Collingbourne78dd67e2011-10-02 23:49:40 +00001422 if (getLangOptions().CUDA)
1423 if (const FunctionDecl *Caller = dyn_cast<FunctionDecl>(CurContext))
1424 if (const FunctionDecl *Callee = dyn_cast<FunctionDecl>(D)) {
1425 CUDAFunctionTarget CallerTarget = IdentifyCUDATarget(Caller),
1426 CalleeTarget = IdentifyCUDATarget(Callee);
1427 if (CheckCUDATarget(CallerTarget, CalleeTarget)) {
1428 Diag(NameInfo.getLoc(), diag::err_ref_bad_target)
1429 << CalleeTarget << D->getIdentifier() << CallerTarget;
1430 Diag(D->getLocation(), diag::note_previous_decl)
1431 << D->getIdentifier();
1432 return ExprError();
1433 }
1434 }
1435
Abramo Bagnara25777432010-08-11 22:01:17 +00001436 MarkDeclarationReferenced(NameInfo.getLoc(), D);
Mike Stump1eb44332009-09-09 15:08:12 +00001437
John McCall7eb0a9e2010-11-24 05:12:34 +00001438 Expr *E = DeclRefExpr::Create(Context,
Douglas Gregor40d96a62011-02-28 21:54:11 +00001439 SS? SS->getWithLocInContext(Context)
1440 : NestedNameSpecifierLoc(),
John McCall7eb0a9e2010-11-24 05:12:34 +00001441 D, NameInfo, Ty, VK);
1442
1443 // Just in case we're building an illegal pointer-to-member.
Richard Smitha6b8b2c2011-10-10 18:28:20 +00001444 FieldDecl *FD = dyn_cast<FieldDecl>(D);
1445 if (FD && FD->isBitField())
John McCall7eb0a9e2010-11-24 05:12:34 +00001446 E->setObjectKind(OK_BitField);
1447
1448 return Owned(E);
Douglas Gregor1a49af92009-01-06 05:10:23 +00001449}
1450
Abramo Bagnara25777432010-08-11 22:01:17 +00001451/// Decomposes the given name into a DeclarationNameInfo, its location, and
John McCall129e2df2009-11-30 22:42:35 +00001452/// possibly a list of template arguments.
1453///
1454/// If this produces template arguments, it is permitted to call
1455/// DecomposeTemplateName.
1456///
1457/// This actually loses a lot of source location information for
1458/// non-standard name kinds; we should consider preserving that in
1459/// some way.
Richard Trieu67e29332011-08-02 04:35:43 +00001460void
1461Sema::DecomposeUnqualifiedId(const UnqualifiedId &Id,
1462 TemplateArgumentListInfo &Buffer,
1463 DeclarationNameInfo &NameInfo,
1464 const TemplateArgumentListInfo *&TemplateArgs) {
John McCall129e2df2009-11-30 22:42:35 +00001465 if (Id.getKind() == UnqualifiedId::IK_TemplateId) {
1466 Buffer.setLAngleLoc(Id.TemplateId->LAngleLoc);
1467 Buffer.setRAngleLoc(Id.TemplateId->RAngleLoc);
1468
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00001469 ASTTemplateArgsPtr TemplateArgsPtr(*this,
John McCall129e2df2009-11-30 22:42:35 +00001470 Id.TemplateId->getTemplateArgs(),
1471 Id.TemplateId->NumArgs);
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00001472 translateTemplateArguments(TemplateArgsPtr, Buffer);
John McCall129e2df2009-11-30 22:42:35 +00001473 TemplateArgsPtr.release();
1474
John McCall2b5289b2010-08-23 07:28:44 +00001475 TemplateName TName = Id.TemplateId->Template.get();
Abramo Bagnara25777432010-08-11 22:01:17 +00001476 SourceLocation TNameLoc = Id.TemplateId->TemplateNameLoc;
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00001477 NameInfo = Context.getNameForTemplate(TName, TNameLoc);
John McCall129e2df2009-11-30 22:42:35 +00001478 TemplateArgs = &Buffer;
1479 } else {
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00001480 NameInfo = GetNameFromUnqualifiedId(Id);
John McCall129e2df2009-11-30 22:42:35 +00001481 TemplateArgs = 0;
1482 }
1483}
1484
John McCall578b69b2009-12-16 08:11:27 +00001485/// Diagnose an empty lookup.
1486///
1487/// \return false if new lookup candidates were found
Nick Lewycky03d98c52010-07-06 19:51:49 +00001488bool Sema::DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
Kaelyn Uhrainace5e762011-08-05 00:09:52 +00001489 CorrectTypoContext CTC,
1490 TemplateArgumentListInfo *ExplicitTemplateArgs,
1491 Expr **Args, unsigned NumArgs) {
John McCall578b69b2009-12-16 08:11:27 +00001492 DeclarationName Name = R.getLookupName();
1493
John McCall578b69b2009-12-16 08:11:27 +00001494 unsigned diagnostic = diag::err_undeclared_var_use;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001495 unsigned diagnostic_suggest = diag::err_undeclared_var_use_suggest;
John McCall578b69b2009-12-16 08:11:27 +00001496 if (Name.getNameKind() == DeclarationName::CXXOperatorName ||
1497 Name.getNameKind() == DeclarationName::CXXLiteralOperatorName ||
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001498 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
John McCall578b69b2009-12-16 08:11:27 +00001499 diagnostic = diag::err_undeclared_use;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001500 diagnostic_suggest = diag::err_undeclared_use_suggest;
1501 }
John McCall578b69b2009-12-16 08:11:27 +00001502
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001503 // If the original lookup was an unqualified lookup, fake an
1504 // unqualified lookup. This is useful when (for example) the
1505 // original lookup would not have found something because it was a
1506 // dependent name.
Nick Lewycky03d98c52010-07-06 19:51:49 +00001507 for (DeclContext *DC = SS.isEmpty() ? CurContext : 0;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001508 DC; DC = DC->getParent()) {
John McCall578b69b2009-12-16 08:11:27 +00001509 if (isa<CXXRecordDecl>(DC)) {
1510 LookupQualifiedName(R, DC);
1511
1512 if (!R.empty()) {
1513 // Don't give errors about ambiguities in this lookup.
1514 R.suppressDiagnostics();
1515
1516 CXXMethodDecl *CurMethod = dyn_cast<CXXMethodDecl>(CurContext);
1517 bool isInstance = CurMethod &&
1518 CurMethod->isInstance() &&
1519 DC == CurMethod->getParent();
1520
1521 // Give a code modification hint to insert 'this->'.
1522 // TODO: fixit for inserting 'Base<T>::' in the other cases.
1523 // Actually quite difficult!
Nick Lewycky03d98c52010-07-06 19:51:49 +00001524 if (isInstance) {
Nick Lewycky03d98c52010-07-06 19:51:49 +00001525 UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(
1526 CallsUndergoingInstantiation.back()->getCallee());
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001527 CXXMethodDecl *DepMethod = cast_or_null<CXXMethodDecl>(
Nick Lewycky03d98c52010-07-06 19:51:49 +00001528 CurMethod->getInstantiatedFromMemberFunction());
Eli Friedmana7e68452010-08-22 01:00:03 +00001529 if (DepMethod) {
Francois Pichet62ec1f22011-09-17 17:15:52 +00001530 if (getLangOptions().MicrosoftExt)
Francois Pichet0f74d1e2011-09-07 00:14:57 +00001531 diagnostic = diag::warn_found_via_dependent_bases_lookup;
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001532 Diag(R.getNameLoc(), diagnostic) << Name
1533 << FixItHint::CreateInsertion(R.getNameLoc(), "this->");
1534 QualType DepThisType = DepMethod->getThisType(Context);
1535 CXXThisExpr *DepThis = new (Context) CXXThisExpr(
1536 R.getNameLoc(), DepThisType, false);
1537 TemplateArgumentListInfo TList;
1538 if (ULE->hasExplicitTemplateArgs())
1539 ULE->copyTemplateArgumentsInto(TList);
Douglas Gregor7c3179c2011-02-28 18:50:33 +00001540
Douglas Gregor7c3179c2011-02-28 18:50:33 +00001541 CXXScopeSpec SS;
Douglas Gregor4c9be892011-02-28 20:01:57 +00001542 SS.Adopt(ULE->getQualifierLoc());
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001543 CXXDependentScopeMemberExpr *DepExpr =
1544 CXXDependentScopeMemberExpr::Create(
1545 Context, DepThis, DepThisType, true, SourceLocation(),
Douglas Gregor7c3179c2011-02-28 18:50:33 +00001546 SS.getWithLocInContext(Context), NULL,
Francois Pichetf7400122011-09-04 23:00:48 +00001547 R.getLookupNameInfo(),
1548 ULE->hasExplicitTemplateArgs() ? &TList : 0);
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001549 CallsUndergoingInstantiation.back()->setCallee(DepExpr);
Eli Friedmana7e68452010-08-22 01:00:03 +00001550 } else {
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001551 // FIXME: we should be able to handle this case too. It is correct
1552 // to add this-> here. This is a workaround for PR7947.
1553 Diag(R.getNameLoc(), diagnostic) << Name;
Eli Friedmana7e68452010-08-22 01:00:03 +00001554 }
Nick Lewycky03d98c52010-07-06 19:51:49 +00001555 } else {
John McCall578b69b2009-12-16 08:11:27 +00001556 Diag(R.getNameLoc(), diagnostic) << Name;
Nick Lewycky03d98c52010-07-06 19:51:49 +00001557 }
John McCall578b69b2009-12-16 08:11:27 +00001558
1559 // Do we really want to note all of these?
1560 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
1561 Diag((*I)->getLocation(), diag::note_dependent_var_use);
1562
1563 // Tell the callee to try to recover.
1564 return false;
1565 }
Douglas Gregore26f0432010-08-09 22:38:14 +00001566
1567 R.clear();
John McCall578b69b2009-12-16 08:11:27 +00001568 }
1569 }
1570
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001571 // We didn't find anything, so try to correct for a typo.
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001572 TypoCorrection Corrected;
1573 if (S && (Corrected = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(),
1574 S, &SS, NULL, false, CTC))) {
1575 std::string CorrectedStr(Corrected.getAsString(getLangOptions()));
1576 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions()));
1577 R.setLookupName(Corrected.getCorrection());
1578
Hans Wennborg701d1e72011-07-12 08:45:31 +00001579 if (NamedDecl *ND = Corrected.getCorrectionDecl()) {
Kaelyn Uhrainf0c1d8f2011-08-03 20:36:05 +00001580 if (Corrected.isOverloaded()) {
1581 OverloadCandidateSet OCS(R.getNameLoc());
1582 OverloadCandidateSet::iterator Best;
1583 for (TypoCorrection::decl_iterator CD = Corrected.begin(),
1584 CDEnd = Corrected.end();
1585 CD != CDEnd; ++CD) {
Kaelyn Uhrainadc7a732011-08-08 17:35:31 +00001586 if (FunctionTemplateDecl *FTD =
Kaelyn Uhrainace5e762011-08-05 00:09:52 +00001587 dyn_cast<FunctionTemplateDecl>(*CD))
1588 AddTemplateOverloadCandidate(
1589 FTD, DeclAccessPair::make(FTD, AS_none), ExplicitTemplateArgs,
1590 Args, NumArgs, OCS);
Kaelyn Uhrainadc7a732011-08-08 17:35:31 +00001591 else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*CD))
1592 if (!ExplicitTemplateArgs || ExplicitTemplateArgs->size() == 0)
1593 AddOverloadCandidate(FD, DeclAccessPair::make(FD, AS_none),
1594 Args, NumArgs, OCS);
Kaelyn Uhrainf0c1d8f2011-08-03 20:36:05 +00001595 }
1596 switch (OCS.BestViableFunction(*this, R.getNameLoc(), Best)) {
1597 case OR_Success:
1598 ND = Best->Function;
1599 break;
1600 default:
Kaelyn Uhrain844d5722011-08-04 23:30:54 +00001601 break;
Kaelyn Uhrainf0c1d8f2011-08-03 20:36:05 +00001602 }
1603 }
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001604 R.addDecl(ND);
1605 if (isa<ValueDecl>(ND) || isa<FunctionTemplateDecl>(ND)) {
Douglas Gregoraaf87162010-04-14 20:04:41 +00001606 if (SS.isEmpty())
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001607 Diag(R.getNameLoc(), diagnostic_suggest) << Name << CorrectedQuotedStr
1608 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr);
Douglas Gregoraaf87162010-04-14 20:04:41 +00001609 else
1610 Diag(R.getNameLoc(), diag::err_no_member_suggest)
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001611 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
Douglas Gregoraaf87162010-04-14 20:04:41 +00001612 << SS.getRange()
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001613 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr);
1614 if (ND)
Douglas Gregoraaf87162010-04-14 20:04:41 +00001615 Diag(ND->getLocation(), diag::note_previous_decl)
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001616 << CorrectedQuotedStr;
Douglas Gregoraaf87162010-04-14 20:04:41 +00001617
1618 // Tell the callee to try to recover.
1619 return false;
1620 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001621
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001622 if (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND)) {
Douglas Gregoraaf87162010-04-14 20:04:41 +00001623 // FIXME: If we ended up with a typo for a type name or
1624 // Objective-C class name, we're in trouble because the parser
1625 // is in the wrong place to recover. Suggest the typo
1626 // correction, but don't make it a fix-it since we're not going
1627 // to recover well anyway.
1628 if (SS.isEmpty())
Richard Trieu67e29332011-08-02 04:35:43 +00001629 Diag(R.getNameLoc(), diagnostic_suggest)
1630 << Name << CorrectedQuotedStr;
Douglas Gregoraaf87162010-04-14 20:04:41 +00001631 else
1632 Diag(R.getNameLoc(), diag::err_no_member_suggest)
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001633 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
Douglas Gregoraaf87162010-04-14 20:04:41 +00001634 << SS.getRange();
1635
1636 // Don't try to recover; it won't work.
1637 return true;
1638 }
1639 } else {
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001640 // FIXME: We found a keyword. Suggest it, but don't provide a fix-it
Douglas Gregoraaf87162010-04-14 20:04:41 +00001641 // because we aren't able to recover.
Douglas Gregord203a162010-01-01 00:15:04 +00001642 if (SS.isEmpty())
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001643 Diag(R.getNameLoc(), diagnostic_suggest) << Name << CorrectedQuotedStr;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001644 else
Douglas Gregord203a162010-01-01 00:15:04 +00001645 Diag(R.getNameLoc(), diag::err_no_member_suggest)
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001646 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
Douglas Gregoraaf87162010-04-14 20:04:41 +00001647 << SS.getRange();
Douglas Gregord203a162010-01-01 00:15:04 +00001648 return true;
1649 }
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001650 }
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001651 R.clear();
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001652
1653 // Emit a special diagnostic for failed member lookups.
1654 // FIXME: computing the declaration context might fail here (?)
1655 if (!SS.isEmpty()) {
1656 Diag(R.getNameLoc(), diag::err_no_member)
1657 << Name << computeDeclContext(SS, false)
1658 << SS.getRange();
1659 return true;
1660 }
1661
John McCall578b69b2009-12-16 08:11:27 +00001662 // Give up, we can't recover.
1663 Diag(R.getNameLoc(), diagnostic) << Name;
1664 return true;
1665}
1666
John McCall60d7b3a2010-08-24 06:29:42 +00001667ExprResult Sema::ActOnIdExpression(Scope *S,
John McCallfb97e752010-08-24 22:52:39 +00001668 CXXScopeSpec &SS,
1669 UnqualifiedId &Id,
1670 bool HasTrailingLParen,
Richard Trieuccd891a2011-09-09 01:45:06 +00001671 bool IsAddressOfOperand) {
1672 assert(!(IsAddressOfOperand && HasTrailingLParen) &&
John McCallf7a1a742009-11-24 19:00:30 +00001673 "cannot be direct & operand and have a trailing lparen");
1674
1675 if (SS.isInvalid())
Douglas Gregor4c921ae2009-01-30 01:04:22 +00001676 return ExprError();
Douglas Gregor5953d8b2009-03-19 17:26:29 +00001677
John McCall129e2df2009-11-30 22:42:35 +00001678 TemplateArgumentListInfo TemplateArgsBuffer;
John McCallf7a1a742009-11-24 19:00:30 +00001679
1680 // Decompose the UnqualifiedId into the following data.
Abramo Bagnara25777432010-08-11 22:01:17 +00001681 DeclarationNameInfo NameInfo;
John McCallf7a1a742009-11-24 19:00:30 +00001682 const TemplateArgumentListInfo *TemplateArgs;
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00001683 DecomposeUnqualifiedId(Id, TemplateArgsBuffer, NameInfo, TemplateArgs);
Douglas Gregor5953d8b2009-03-19 17:26:29 +00001684
Abramo Bagnara25777432010-08-11 22:01:17 +00001685 DeclarationName Name = NameInfo.getName();
Douglas Gregor10c42622008-11-18 15:03:34 +00001686 IdentifierInfo *II = Name.getAsIdentifierInfo();
Abramo Bagnara25777432010-08-11 22:01:17 +00001687 SourceLocation NameLoc = NameInfo.getLoc();
John McCallba135432009-11-21 08:51:07 +00001688
John McCallf7a1a742009-11-24 19:00:30 +00001689 // C++ [temp.dep.expr]p3:
1690 // An id-expression is type-dependent if it contains:
Douglas Gregor48026d22010-01-11 18:40:55 +00001691 // -- an identifier that was declared with a dependent type,
1692 // (note: handled after lookup)
1693 // -- a template-id that is dependent,
1694 // (note: handled in BuildTemplateIdExpr)
1695 // -- a conversion-function-id that specifies a dependent type,
John McCallf7a1a742009-11-24 19:00:30 +00001696 // -- a nested-name-specifier that contains a class-name that
1697 // names a dependent type.
1698 // Determine whether this is a member of an unknown specialization;
1699 // we need to handle these differently.
Eli Friedman647c8b32010-08-06 23:41:47 +00001700 bool DependentID = false;
1701 if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName &&
1702 Name.getCXXNameType()->isDependentType()) {
1703 DependentID = true;
1704 } else if (SS.isSet()) {
Chris Lattner337e5502011-02-18 01:27:55 +00001705 if (DeclContext *DC = computeDeclContext(SS, false)) {
Eli Friedman647c8b32010-08-06 23:41:47 +00001706 if (RequireCompleteDeclContext(SS, DC))
1707 return ExprError();
Eli Friedman647c8b32010-08-06 23:41:47 +00001708 } else {
1709 DependentID = true;
1710 }
1711 }
1712
Chris Lattner337e5502011-02-18 01:27:55 +00001713 if (DependentID)
Richard Trieuccd891a2011-09-09 01:45:06 +00001714 return ActOnDependentIdExpression(SS, NameInfo, IsAddressOfOperand,
John McCallf7a1a742009-11-24 19:00:30 +00001715 TemplateArgs);
Chris Lattner337e5502011-02-18 01:27:55 +00001716
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001717 bool IvarLookupFollowUp = false;
John McCallf7a1a742009-11-24 19:00:30 +00001718 // Perform the required lookup.
Fariborz Jahanian98a54032011-07-12 17:16:56 +00001719 LookupResult R(*this, NameInfo,
1720 (Id.getKind() == UnqualifiedId::IK_ImplicitSelfParam)
1721 ? LookupObjCImplicitSelfParam : LookupOrdinaryName);
John McCallf7a1a742009-11-24 19:00:30 +00001722 if (TemplateArgs) {
Douglas Gregord2235f62010-05-20 20:58:56 +00001723 // Lookup the template name again to correctly establish the context in
1724 // which it was found. This is really unfortunate as we already did the
1725 // lookup to determine that it was a template name in the first place. If
1726 // this becomes a performance hit, we can work harder to preserve those
1727 // results until we get here but it's likely not worth it.
Douglas Gregor1fd6d442010-05-21 23:18:07 +00001728 bool MemberOfUnknownSpecialization;
1729 LookupTemplateName(R, S, SS, QualType(), /*EnteringContext=*/false,
1730 MemberOfUnknownSpecialization);
Douglas Gregor2f9f89c2011-02-04 13:35:07 +00001731
1732 if (MemberOfUnknownSpecialization ||
1733 (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation))
Richard Trieuccd891a2011-09-09 01:45:06 +00001734 return ActOnDependentIdExpression(SS, NameInfo, IsAddressOfOperand,
Douglas Gregor2f9f89c2011-02-04 13:35:07 +00001735 TemplateArgs);
John McCallf7a1a742009-11-24 19:00:30 +00001736 } else {
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001737 IvarLookupFollowUp = (!SS.isSet() && II && getCurMethodDecl());
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00001738 LookupParsedName(R, S, &SS, !IvarLookupFollowUp);
Mike Stump1eb44332009-09-09 15:08:12 +00001739
Douglas Gregor2f9f89c2011-02-04 13:35:07 +00001740 // If the result might be in a dependent base class, this is a dependent
1741 // id-expression.
1742 if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)
Richard Trieuccd891a2011-09-09 01:45:06 +00001743 return ActOnDependentIdExpression(SS, NameInfo, IsAddressOfOperand,
Douglas Gregor2f9f89c2011-02-04 13:35:07 +00001744 TemplateArgs);
1745
John McCallf7a1a742009-11-24 19:00:30 +00001746 // If this reference is in an Objective-C method, then we need to do
1747 // some special Objective-C lookup, too.
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00001748 if (IvarLookupFollowUp) {
John McCall60d7b3a2010-08-24 06:29:42 +00001749 ExprResult E(LookupInObjCMethod(R, S, II, true));
John McCallf7a1a742009-11-24 19:00:30 +00001750 if (E.isInvalid())
1751 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00001752
Chris Lattner337e5502011-02-18 01:27:55 +00001753 if (Expr *Ex = E.takeAs<Expr>())
1754 return Owned(Ex);
1755
Fariborz Jahanianf759b4d2010-08-13 18:09:39 +00001756 // for further use, this must be set to false if in class method.
1757 IvarLookupFollowUp = getCurMethodDecl()->isInstanceMethod();
Steve Naroffe3e9add2008-06-02 23:03:37 +00001758 }
Chris Lattner8a934232008-03-31 00:36:02 +00001759 }
Douglas Gregorc71e28c2009-02-16 19:28:42 +00001760
John McCallf7a1a742009-11-24 19:00:30 +00001761 if (R.isAmbiguous())
1762 return ExprError();
1763
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001764 // Determine whether this name might be a candidate for
1765 // argument-dependent lookup.
John McCallf7a1a742009-11-24 19:00:30 +00001766 bool ADL = UseArgumentDependentLookup(SS, R, HasTrailingLParen);
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001767
John McCallf7a1a742009-11-24 19:00:30 +00001768 if (R.empty() && !ADL) {
Reid Spencer5f016e22007-07-11 17:01:13 +00001769 // Otherwise, this could be an implicitly declared function reference (legal
John McCallf7a1a742009-11-24 19:00:30 +00001770 // in C90, extension in C99, forbidden in C++).
1771 if (HasTrailingLParen && II && !getLangOptions().CPlusPlus) {
1772 NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *II, S);
1773 if (D) R.addDecl(D);
1774 }
1775
1776 // If this name wasn't predeclared and if this is not a function
1777 // call, diagnose the problem.
1778 if (R.empty()) {
Francois Pichetfce1a3a2011-09-24 10:38:05 +00001779
1780 // In Microsoft mode, if we are inside a template class member function
1781 // and we can't resolve an identifier then assume the identifier is type
1782 // dependent. The goal is to postpone name lookup to instantiation time
1783 // to be able to search into type dependent base classes.
1784 if (getLangOptions().MicrosoftMode && CurContext->isDependentContext() &&
1785 isa<CXXMethodDecl>(CurContext))
1786 return ActOnDependentIdExpression(SS, NameInfo, IsAddressOfOperand,
1787 TemplateArgs);
1788
Douglas Gregor91f7ac72010-05-18 16:14:23 +00001789 if (DiagnoseEmptyLookup(S, SS, R, CTC_Unknown))
John McCall578b69b2009-12-16 08:11:27 +00001790 return ExprError();
1791
1792 assert(!R.empty() &&
1793 "DiagnoseEmptyLookup returned false but added no results");
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001794
1795 // If we found an Objective-C instance variable, let
1796 // LookupInObjCMethod build the appropriate expression to
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001797 // reference the ivar.
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001798 if (ObjCIvarDecl *Ivar = R.getAsSingle<ObjCIvarDecl>()) {
1799 R.clear();
John McCall60d7b3a2010-08-24 06:29:42 +00001800 ExprResult E(LookupInObjCMethod(R, S, Ivar->getIdentifier()));
Fariborz Jahanianbc2b91a2011-09-23 23:11:38 +00001801 // In a hopelessly buggy code, Objective-C instance variable
1802 // lookup fails and no expression will be built to reference it.
1803 if (!E.isInvalid() && !E.get())
1804 return ExprError();
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001805 return move(E);
1806 }
Reid Spencer5f016e22007-07-11 17:01:13 +00001807 }
1808 }
Mike Stump1eb44332009-09-09 15:08:12 +00001809
John McCallf7a1a742009-11-24 19:00:30 +00001810 // This is guaranteed from this point on.
1811 assert(!R.empty() || ADL);
1812
John McCallaa81e162009-12-01 22:10:20 +00001813 // Check whether this might be a C++ implicit instance member access.
John McCallfb97e752010-08-24 22:52:39 +00001814 // C++ [class.mfct.non-static]p3:
1815 // When an id-expression that is not part of a class member access
1816 // syntax and not used to form a pointer to member is used in the
1817 // body of a non-static member function of class X, if name lookup
1818 // resolves the name in the id-expression to a non-static non-type
1819 // member of some class C, the id-expression is transformed into a
1820 // class member access expression using (*this) as the
1821 // postfix-expression to the left of the . operator.
John McCall9c72c602010-08-27 09:08:28 +00001822 //
1823 // But we don't actually need to do this for '&' operands if R
1824 // resolved to a function or overloaded function set, because the
1825 // expression is ill-formed if it actually works out to be a
1826 // non-static member function:
1827 //
1828 // C++ [expr.ref]p4:
1829 // Otherwise, if E1.E2 refers to a non-static member function. . .
1830 // [t]he expression can be used only as the left-hand operand of a
1831 // member function call.
1832 //
1833 // There are other safeguards against such uses, but it's important
1834 // to get this right here so that we don't end up making a
1835 // spuriously dependent expression if we're inside a dependent
1836 // instance method.
John McCall3b4294e2009-12-16 12:17:52 +00001837 if (!R.empty() && (*R.begin())->isCXXClassMember()) {
John McCall9c72c602010-08-27 09:08:28 +00001838 bool MightBeImplicitMember;
Richard Trieuccd891a2011-09-09 01:45:06 +00001839 if (!IsAddressOfOperand)
John McCall9c72c602010-08-27 09:08:28 +00001840 MightBeImplicitMember = true;
1841 else if (!SS.isEmpty())
1842 MightBeImplicitMember = false;
1843 else if (R.isOverloadedResult())
1844 MightBeImplicitMember = false;
Douglas Gregore2248be2010-08-30 16:00:47 +00001845 else if (R.isUnresolvableResult())
1846 MightBeImplicitMember = true;
John McCall9c72c602010-08-27 09:08:28 +00001847 else
Francois Pichet87c2e122010-11-21 06:08:52 +00001848 MightBeImplicitMember = isa<FieldDecl>(R.getFoundDecl()) ||
1849 isa<IndirectFieldDecl>(R.getFoundDecl());
John McCall9c72c602010-08-27 09:08:28 +00001850
1851 if (MightBeImplicitMember)
John McCall3b4294e2009-12-16 12:17:52 +00001852 return BuildPossibleImplicitMemberExpr(SS, R, TemplateArgs);
John McCall5b3f9132009-11-22 01:44:31 +00001853 }
1854
John McCallf7a1a742009-11-24 19:00:30 +00001855 if (TemplateArgs)
1856 return BuildTemplateIdExpr(SS, R, ADL, *TemplateArgs);
John McCall5b3f9132009-11-22 01:44:31 +00001857
John McCallf7a1a742009-11-24 19:00:30 +00001858 return BuildDeclarationNameExpr(SS, R, ADL);
1859}
1860
John McCall129e2df2009-11-30 22:42:35 +00001861/// BuildQualifiedDeclarationNameExpr - Build a C++ qualified
1862/// declaration name, generally during template instantiation.
1863/// There's a large number of things which don't need to be done along
1864/// this path.
John McCall60d7b3a2010-08-24 06:29:42 +00001865ExprResult
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00001866Sema::BuildQualifiedDeclarationNameExpr(CXXScopeSpec &SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00001867 const DeclarationNameInfo &NameInfo) {
John McCallf7a1a742009-11-24 19:00:30 +00001868 DeclContext *DC;
Douglas Gregore6ec5c42010-04-28 07:04:26 +00001869 if (!(DC = computeDeclContext(SS, false)) || DC->isDependentContext())
Abramo Bagnara25777432010-08-11 22:01:17 +00001870 return BuildDependentDeclRefExpr(SS, NameInfo, 0);
John McCallf7a1a742009-11-24 19:00:30 +00001871
John McCall77bb1aa2010-05-01 00:40:08 +00001872 if (RequireCompleteDeclContext(SS, DC))
Douglas Gregore6ec5c42010-04-28 07:04:26 +00001873 return ExprError();
1874
Abramo Bagnara25777432010-08-11 22:01:17 +00001875 LookupResult R(*this, NameInfo, LookupOrdinaryName);
John McCallf7a1a742009-11-24 19:00:30 +00001876 LookupQualifiedName(R, DC);
1877
1878 if (R.isAmbiguous())
1879 return ExprError();
1880
1881 if (R.empty()) {
Abramo Bagnara25777432010-08-11 22:01:17 +00001882 Diag(NameInfo.getLoc(), diag::err_no_member)
1883 << NameInfo.getName() << DC << SS.getRange();
John McCallf7a1a742009-11-24 19:00:30 +00001884 return ExprError();
1885 }
1886
1887 return BuildDeclarationNameExpr(SS, R, /*ADL*/ false);
1888}
1889
1890/// LookupInObjCMethod - The parser has read a name in, and Sema has
1891/// detected that we're currently inside an ObjC method. Perform some
1892/// additional lookup.
1893///
1894/// Ideally, most of this would be done by lookup, but there's
1895/// actually quite a lot of extra work involved.
1896///
1897/// Returns a null sentinel to indicate trivial success.
John McCall60d7b3a2010-08-24 06:29:42 +00001898ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00001899Sema::LookupInObjCMethod(LookupResult &Lookup, Scope *S,
Chris Lattnereb483eb2010-04-11 08:28:14 +00001900 IdentifierInfo *II, bool AllowBuiltinCreation) {
John McCallf7a1a742009-11-24 19:00:30 +00001901 SourceLocation Loc = Lookup.getNameLoc();
Chris Lattneraec43db2010-04-12 05:10:17 +00001902 ObjCMethodDecl *CurMethod = getCurMethodDecl();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001903
John McCallf7a1a742009-11-24 19:00:30 +00001904 // There are two cases to handle here. 1) scoped lookup could have failed,
1905 // in which case we should look for an ivar. 2) scoped lookup could have
1906 // found a decl, but that decl is outside the current instance method (i.e.
1907 // a global variable). In these two cases, we do a lookup for an ivar with
1908 // this name, if the lookup sucedes, we replace it our current decl.
1909
1910 // If we're in a class method, we don't normally want to look for
1911 // ivars. But if we don't find anything else, and there's an
1912 // ivar, that's an error.
Chris Lattneraec43db2010-04-12 05:10:17 +00001913 bool IsClassMethod = CurMethod->isClassMethod();
John McCallf7a1a742009-11-24 19:00:30 +00001914
1915 bool LookForIvars;
1916 if (Lookup.empty())
1917 LookForIvars = true;
1918 else if (IsClassMethod)
1919 LookForIvars = false;
1920 else
1921 LookForIvars = (Lookup.isSingleResult() &&
1922 Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod());
Fariborz Jahanian412e7982010-02-09 19:31:38 +00001923 ObjCInterfaceDecl *IFace = 0;
John McCallf7a1a742009-11-24 19:00:30 +00001924 if (LookForIvars) {
Chris Lattneraec43db2010-04-12 05:10:17 +00001925 IFace = CurMethod->getClassInterface();
John McCallf7a1a742009-11-24 19:00:30 +00001926 ObjCInterfaceDecl *ClassDeclared;
Argyrios Kyrtzidis7c81c2a2011-10-19 02:25:16 +00001927 ObjCIvarDecl *IV = 0;
1928 if (IFace && (IV = IFace->lookupInstanceVariable(II, ClassDeclared))) {
John McCallf7a1a742009-11-24 19:00:30 +00001929 // Diagnose using an ivar in a class method.
1930 if (IsClassMethod)
1931 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method)
1932 << IV->getDeclName());
1933
1934 // If we're referencing an invalid decl, just return this as a silent
1935 // error node. The error diagnostic was already emitted on the decl.
1936 if (IV->isInvalidDecl())
1937 return ExprError();
1938
1939 // Check if referencing a field with __attribute__((deprecated)).
1940 if (DiagnoseUseOfDecl(IV, Loc))
1941 return ExprError();
1942
1943 // Diagnose the use of an ivar outside of the declaring class.
1944 if (IV->getAccessControl() == ObjCIvarDecl::Private &&
1945 ClassDeclared != IFace)
1946 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName();
1947
1948 // FIXME: This should use a new expr for a direct reference, don't
1949 // turn this into Self->ivar, just return a BareIVarExpr or something.
1950 IdentifierInfo &II = Context.Idents.get("self");
1951 UnqualifiedId SelfName;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001952 SelfName.setIdentifier(&II, SourceLocation());
Fariborz Jahanian98a54032011-07-12 17:16:56 +00001953 SelfName.setKind(UnqualifiedId::IK_ImplicitSelfParam);
John McCallf7a1a742009-11-24 19:00:30 +00001954 CXXScopeSpec SelfScopeSpec;
John McCall60d7b3a2010-08-24 06:29:42 +00001955 ExprResult SelfExpr = ActOnIdExpression(S, SelfScopeSpec,
Douglas Gregore45bb6a2010-09-22 16:33:13 +00001956 SelfName, false, false);
1957 if (SelfExpr.isInvalid())
1958 return ExprError();
1959
John Wiegley429bb272011-04-08 18:41:53 +00001960 SelfExpr = DefaultLvalueConversion(SelfExpr.take());
1961 if (SelfExpr.isInvalid())
1962 return ExprError();
John McCall409fa9a2010-12-06 20:48:59 +00001963
John McCallf7a1a742009-11-24 19:00:30 +00001964 MarkDeclarationReferenced(Loc, IV);
1965 return Owned(new (Context)
1966 ObjCIvarRefExpr(IV, IV->getType(), Loc,
John Wiegley429bb272011-04-08 18:41:53 +00001967 SelfExpr.take(), true, true));
John McCallf7a1a742009-11-24 19:00:30 +00001968 }
Chris Lattneraec43db2010-04-12 05:10:17 +00001969 } else if (CurMethod->isInstanceMethod()) {
John McCallf7a1a742009-11-24 19:00:30 +00001970 // We should warn if a local variable hides an ivar.
Fariborz Jahanian90f7b622011-11-08 22:51:27 +00001971 if (ObjCInterfaceDecl *IFace = CurMethod->getClassInterface()) {
1972 ObjCInterfaceDecl *ClassDeclared;
1973 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
1974 if (IV->getAccessControl() != ObjCIvarDecl::Private ||
1975 IFace == ClassDeclared)
1976 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName();
1977 }
John McCallf7a1a742009-11-24 19:00:30 +00001978 }
1979 }
1980
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00001981 if (Lookup.empty() && II && AllowBuiltinCreation) {
1982 // FIXME. Consolidate this with similar code in LookupName.
1983 if (unsigned BuiltinID = II->getBuiltinID()) {
1984 if (!(getLangOptions().CPlusPlus &&
1985 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))) {
1986 NamedDecl *D = LazilyCreateBuiltin((IdentifierInfo *)II, BuiltinID,
1987 S, Lookup.isForRedeclaration(),
1988 Lookup.getNameLoc());
1989 if (D) Lookup.addDecl(D);
1990 }
1991 }
1992 }
John McCallf7a1a742009-11-24 19:00:30 +00001993 // Sentinel value saying that we didn't do anything special.
1994 return Owned((Expr*) 0);
Douglas Gregor751f9a42009-06-30 15:47:41 +00001995}
John McCallba135432009-11-21 08:51:07 +00001996
John McCall6bb80172010-03-30 21:47:33 +00001997/// \brief Cast a base object to a member's actual type.
1998///
1999/// Logically this happens in three phases:
2000///
2001/// * First we cast from the base type to the naming class.
2002/// The naming class is the class into which we were looking
2003/// when we found the member; it's the qualifier type if a
2004/// qualifier was provided, and otherwise it's the base type.
2005///
2006/// * Next we cast from the naming class to the declaring class.
2007/// If the member we found was brought into a class's scope by
2008/// a using declaration, this is that class; otherwise it's
2009/// the class declaring the member.
2010///
2011/// * Finally we cast from the declaring class to the "true"
2012/// declaring class of the member. This conversion does not
2013/// obey access control.
John Wiegley429bb272011-04-08 18:41:53 +00002014ExprResult
2015Sema::PerformObjectMemberConversion(Expr *From,
Douglas Gregor5fccd362010-03-03 23:55:11 +00002016 NestedNameSpecifier *Qualifier,
John McCall6bb80172010-03-30 21:47:33 +00002017 NamedDecl *FoundDecl,
Douglas Gregor5fccd362010-03-03 23:55:11 +00002018 NamedDecl *Member) {
2019 CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Member->getDeclContext());
2020 if (!RD)
John Wiegley429bb272011-04-08 18:41:53 +00002021 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002022
Douglas Gregor5fccd362010-03-03 23:55:11 +00002023 QualType DestRecordType;
2024 QualType DestType;
2025 QualType FromRecordType;
2026 QualType FromType = From->getType();
2027 bool PointerConversions = false;
2028 if (isa<FieldDecl>(Member)) {
2029 DestRecordType = Context.getCanonicalType(Context.getTypeDeclType(RD));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002030
Douglas Gregor5fccd362010-03-03 23:55:11 +00002031 if (FromType->getAs<PointerType>()) {
2032 DestType = Context.getPointerType(DestRecordType);
2033 FromRecordType = FromType->getPointeeType();
2034 PointerConversions = true;
2035 } else {
2036 DestType = DestRecordType;
2037 FromRecordType = FromType;
Fariborz Jahanian98a541e2009-07-29 18:40:24 +00002038 }
Douglas Gregor5fccd362010-03-03 23:55:11 +00002039 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) {
2040 if (Method->isStatic())
John Wiegley429bb272011-04-08 18:41:53 +00002041 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002042
Douglas Gregor5fccd362010-03-03 23:55:11 +00002043 DestType = Method->getThisType(Context);
2044 DestRecordType = DestType->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002045
Douglas Gregor5fccd362010-03-03 23:55:11 +00002046 if (FromType->getAs<PointerType>()) {
2047 FromRecordType = FromType->getPointeeType();
2048 PointerConversions = true;
2049 } else {
2050 FromRecordType = FromType;
2051 DestType = DestRecordType;
2052 }
2053 } else {
2054 // No conversion necessary.
John Wiegley429bb272011-04-08 18:41:53 +00002055 return Owned(From);
Douglas Gregor5fccd362010-03-03 23:55:11 +00002056 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002057
Douglas Gregor5fccd362010-03-03 23:55:11 +00002058 if (DestType->isDependentType() || FromType->isDependentType())
John Wiegley429bb272011-04-08 18:41:53 +00002059 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002060
Douglas Gregor5fccd362010-03-03 23:55:11 +00002061 // If the unqualified types are the same, no conversion is necessary.
2062 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
John Wiegley429bb272011-04-08 18:41:53 +00002063 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002064
John McCall6bb80172010-03-30 21:47:33 +00002065 SourceRange FromRange = From->getSourceRange();
2066 SourceLocation FromLoc = FromRange.getBegin();
2067
Eli Friedmanc1c0dfb2011-09-27 21:58:52 +00002068 ExprValueKind VK = From->getValueKind();
Sebastian Redl906082e2010-07-20 04:20:21 +00002069
Douglas Gregor5fccd362010-03-03 23:55:11 +00002070 // C++ [class.member.lookup]p8:
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002071 // [...] Ambiguities can often be resolved by qualifying a name with its
Douglas Gregor5fccd362010-03-03 23:55:11 +00002072 // class name.
2073 //
2074 // If the member was a qualified name and the qualified referred to a
2075 // specific base subobject type, we'll cast to that intermediate type
2076 // first and then to the object in which the member is declared. That allows
2077 // one to resolve ambiguities in, e.g., a diamond-shaped hierarchy such as:
2078 //
2079 // class Base { public: int x; };
2080 // class Derived1 : public Base { };
2081 // class Derived2 : public Base { };
2082 // class VeryDerived : public Derived1, public Derived2 { void f(); };
2083 //
2084 // void VeryDerived::f() {
2085 // x = 17; // error: ambiguous base subobjects
2086 // Derived1::x = 17; // okay, pick the Base subobject of Derived1
2087 // }
Douglas Gregor5fccd362010-03-03 23:55:11 +00002088 if (Qualifier) {
John McCall6bb80172010-03-30 21:47:33 +00002089 QualType QType = QualType(Qualifier->getAsType(), 0);
2090 assert(!QType.isNull() && "lookup done with dependent qualifier?");
2091 assert(QType->isRecordType() && "lookup done with non-record type");
2092
2093 QualType QRecordType = QualType(QType->getAs<RecordType>(), 0);
2094
2095 // In C++98, the qualifier type doesn't actually have to be a base
2096 // type of the object type, in which case we just ignore it.
2097 // Otherwise build the appropriate casts.
2098 if (IsDerivedFrom(FromRecordType, QRecordType)) {
John McCallf871d0c2010-08-07 06:22:56 +00002099 CXXCastPath BasePath;
John McCall6bb80172010-03-30 21:47:33 +00002100 if (CheckDerivedToBaseConversion(FromRecordType, QRecordType,
Anders Carlssoncee22422010-04-24 19:22:20 +00002101 FromLoc, FromRange, &BasePath))
John Wiegley429bb272011-04-08 18:41:53 +00002102 return ExprError();
John McCall6bb80172010-03-30 21:47:33 +00002103
Douglas Gregor5fccd362010-03-03 23:55:11 +00002104 if (PointerConversions)
John McCall6bb80172010-03-30 21:47:33 +00002105 QType = Context.getPointerType(QType);
John Wiegley429bb272011-04-08 18:41:53 +00002106 From = ImpCastExprToType(From, QType, CK_UncheckedDerivedToBase,
2107 VK, &BasePath).take();
John McCall6bb80172010-03-30 21:47:33 +00002108
2109 FromType = QType;
2110 FromRecordType = QRecordType;
2111
2112 // If the qualifier type was the same as the destination type,
2113 // we're done.
2114 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
John Wiegley429bb272011-04-08 18:41:53 +00002115 return Owned(From);
Douglas Gregor5fccd362010-03-03 23:55:11 +00002116 }
2117 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002118
John McCall6bb80172010-03-30 21:47:33 +00002119 bool IgnoreAccess = false;
Douglas Gregor5fccd362010-03-03 23:55:11 +00002120
John McCall6bb80172010-03-30 21:47:33 +00002121 // If we actually found the member through a using declaration, cast
2122 // down to the using declaration's type.
2123 //
2124 // Pointer equality is fine here because only one declaration of a
2125 // class ever has member declarations.
2126 if (FoundDecl->getDeclContext() != Member->getDeclContext()) {
2127 assert(isa<UsingShadowDecl>(FoundDecl));
2128 QualType URecordType = Context.getTypeDeclType(
2129 cast<CXXRecordDecl>(FoundDecl->getDeclContext()));
2130
2131 // We only need to do this if the naming-class to declaring-class
2132 // conversion is non-trivial.
2133 if (!Context.hasSameUnqualifiedType(FromRecordType, URecordType)) {
2134 assert(IsDerivedFrom(FromRecordType, URecordType));
John McCallf871d0c2010-08-07 06:22:56 +00002135 CXXCastPath BasePath;
John McCall6bb80172010-03-30 21:47:33 +00002136 if (CheckDerivedToBaseConversion(FromRecordType, URecordType,
Anders Carlssoncee22422010-04-24 19:22:20 +00002137 FromLoc, FromRange, &BasePath))
John Wiegley429bb272011-04-08 18:41:53 +00002138 return ExprError();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00002139
John McCall6bb80172010-03-30 21:47:33 +00002140 QualType UType = URecordType;
2141 if (PointerConversions)
2142 UType = Context.getPointerType(UType);
John Wiegley429bb272011-04-08 18:41:53 +00002143 From = ImpCastExprToType(From, UType, CK_UncheckedDerivedToBase,
2144 VK, &BasePath).take();
John McCall6bb80172010-03-30 21:47:33 +00002145 FromType = UType;
2146 FromRecordType = URecordType;
2147 }
2148
2149 // We don't do access control for the conversion from the
2150 // declaring class to the true declaring class.
2151 IgnoreAccess = true;
Douglas Gregor5fccd362010-03-03 23:55:11 +00002152 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002153
John McCallf871d0c2010-08-07 06:22:56 +00002154 CXXCastPath BasePath;
Anders Carlssoncee22422010-04-24 19:22:20 +00002155 if (CheckDerivedToBaseConversion(FromRecordType, DestRecordType,
2156 FromLoc, FromRange, &BasePath,
John McCall6bb80172010-03-30 21:47:33 +00002157 IgnoreAccess))
John Wiegley429bb272011-04-08 18:41:53 +00002158 return ExprError();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002159
John Wiegley429bb272011-04-08 18:41:53 +00002160 return ImpCastExprToType(From, DestType, CK_UncheckedDerivedToBase,
2161 VK, &BasePath);
Fariborz Jahanian98a541e2009-07-29 18:40:24 +00002162}
Douglas Gregor751f9a42009-06-30 15:47:41 +00002163
John McCallf7a1a742009-11-24 19:00:30 +00002164bool Sema::UseArgumentDependentLookup(const CXXScopeSpec &SS,
John McCall5b3f9132009-11-22 01:44:31 +00002165 const LookupResult &R,
2166 bool HasTrailingLParen) {
John McCallba135432009-11-21 08:51:07 +00002167 // Only when used directly as the postfix-expression of a call.
2168 if (!HasTrailingLParen)
2169 return false;
2170
2171 // Never if a scope specifier was provided.
John McCallf7a1a742009-11-24 19:00:30 +00002172 if (SS.isSet())
John McCallba135432009-11-21 08:51:07 +00002173 return false;
2174
2175 // Only in C++ or ObjC++.
John McCall5b3f9132009-11-22 01:44:31 +00002176 if (!getLangOptions().CPlusPlus)
John McCallba135432009-11-21 08:51:07 +00002177 return false;
2178
2179 // Turn off ADL when we find certain kinds of declarations during
2180 // normal lookup:
2181 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
2182 NamedDecl *D = *I;
2183
2184 // C++0x [basic.lookup.argdep]p3:
2185 // -- a declaration of a class member
2186 // Since using decls preserve this property, we check this on the
2187 // original decl.
John McCall3b4294e2009-12-16 12:17:52 +00002188 if (D->isCXXClassMember())
John McCallba135432009-11-21 08:51:07 +00002189 return false;
2190
2191 // C++0x [basic.lookup.argdep]p3:
2192 // -- a block-scope function declaration that is not a
2193 // using-declaration
2194 // NOTE: we also trigger this for function templates (in fact, we
2195 // don't check the decl type at all, since all other decl types
2196 // turn off ADL anyway).
2197 if (isa<UsingShadowDecl>(D))
2198 D = cast<UsingShadowDecl>(D)->getTargetDecl();
2199 else if (D->getDeclContext()->isFunctionOrMethod())
2200 return false;
2201
2202 // C++0x [basic.lookup.argdep]p3:
2203 // -- a declaration that is neither a function or a function
2204 // template
2205 // And also for builtin functions.
2206 if (isa<FunctionDecl>(D)) {
2207 FunctionDecl *FDecl = cast<FunctionDecl>(D);
2208
2209 // But also builtin functions.
2210 if (FDecl->getBuiltinID() && FDecl->isImplicit())
2211 return false;
2212 } else if (!isa<FunctionTemplateDecl>(D))
2213 return false;
2214 }
2215
2216 return true;
2217}
2218
2219
John McCallba135432009-11-21 08:51:07 +00002220/// Diagnoses obvious problems with the use of the given declaration
2221/// as an expression. This is only actually called for lookups that
2222/// were not overloaded, and it doesn't promise that the declaration
2223/// will in fact be used.
2224static bool CheckDeclInExpr(Sema &S, SourceLocation Loc, NamedDecl *D) {
Richard Smith162e1c12011-04-15 14:24:37 +00002225 if (isa<TypedefNameDecl>(D)) {
John McCallba135432009-11-21 08:51:07 +00002226 S.Diag(Loc, diag::err_unexpected_typedef) << D->getDeclName();
2227 return true;
2228 }
2229
2230 if (isa<ObjCInterfaceDecl>(D)) {
2231 S.Diag(Loc, diag::err_unexpected_interface) << D->getDeclName();
2232 return true;
2233 }
2234
2235 if (isa<NamespaceDecl>(D)) {
2236 S.Diag(Loc, diag::err_unexpected_namespace) << D->getDeclName();
2237 return true;
2238 }
2239
2240 return false;
2241}
2242
John McCall60d7b3a2010-08-24 06:29:42 +00002243ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00002244Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
John McCall5b3f9132009-11-22 01:44:31 +00002245 LookupResult &R,
2246 bool NeedsADL) {
John McCallfead20c2009-12-08 22:45:53 +00002247 // If this is a single, fully-resolved result and we don't need ADL,
2248 // just build an ordinary singleton decl ref.
Douglas Gregor86b8e092010-01-29 17:15:43 +00002249 if (!NeedsADL && R.isSingleResult() && !R.getAsSingle<FunctionTemplateDecl>())
Abramo Bagnara25777432010-08-11 22:01:17 +00002250 return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(),
2251 R.getFoundDecl());
John McCallba135432009-11-21 08:51:07 +00002252
2253 // We only need to check the declaration if there's exactly one
2254 // result, because in the overloaded case the results can only be
2255 // functions and function templates.
John McCall5b3f9132009-11-22 01:44:31 +00002256 if (R.isSingleResult() &&
2257 CheckDeclInExpr(*this, R.getNameLoc(), R.getFoundDecl()))
John McCallba135432009-11-21 08:51:07 +00002258 return ExprError();
2259
John McCallc373d482010-01-27 01:50:18 +00002260 // Otherwise, just build an unresolved lookup expression. Suppress
2261 // any lookup-related diagnostics; we'll hash these out later, when
2262 // we've picked a target.
2263 R.suppressDiagnostics();
2264
John McCallba135432009-11-21 08:51:07 +00002265 UnresolvedLookupExpr *ULE
Douglas Gregorbebbe0d2010-12-15 01:34:56 +00002266 = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
Douglas Gregor4c9be892011-02-28 20:01:57 +00002267 SS.getWithLocInContext(Context),
2268 R.getLookupNameInfo(),
Douglas Gregor5a84dec2010-05-23 18:57:34 +00002269 NeedsADL, R.isOverloadedResult(),
2270 R.begin(), R.end());
John McCallba135432009-11-21 08:51:07 +00002271
2272 return Owned(ULE);
2273}
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002274
John McCallba135432009-11-21 08:51:07 +00002275/// \brief Complete semantic analysis for a reference to the given declaration.
John McCall60d7b3a2010-08-24 06:29:42 +00002276ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00002277Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00002278 const DeclarationNameInfo &NameInfo,
2279 NamedDecl *D) {
John McCallba135432009-11-21 08:51:07 +00002280 assert(D && "Cannot refer to a NULL declaration");
John McCall7453ed42009-11-22 00:44:51 +00002281 assert(!isa<FunctionTemplateDecl>(D) &&
2282 "Cannot refer unambiguously to a function template");
John McCallba135432009-11-21 08:51:07 +00002283
Abramo Bagnara25777432010-08-11 22:01:17 +00002284 SourceLocation Loc = NameInfo.getLoc();
John McCallba135432009-11-21 08:51:07 +00002285 if (CheckDeclInExpr(*this, Loc, D))
2286 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00002287
Douglas Gregor9af2f522009-12-01 16:58:18 +00002288 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) {
2289 // Specifically diagnose references to class templates that are missing
2290 // a template argument list.
2291 Diag(Loc, diag::err_template_decl_ref)
2292 << Template << SS.getRange();
2293 Diag(Template->getLocation(), diag::note_template_decl_here);
2294 return ExprError();
2295 }
2296
2297 // Make sure that we're referring to a value.
2298 ValueDecl *VD = dyn_cast<ValueDecl>(D);
2299 if (!VD) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002300 Diag(Loc, diag::err_ref_non_value)
Douglas Gregor9af2f522009-12-01 16:58:18 +00002301 << D << SS.getRange();
John McCall87cf6702009-12-18 18:35:10 +00002302 Diag(D->getLocation(), diag::note_declared_at);
Douglas Gregor9af2f522009-12-01 16:58:18 +00002303 return ExprError();
2304 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002305
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002306 // Check whether this declaration can be used. Note that we suppress
2307 // this check when we're going to perform argument-dependent lookup
2308 // on this function name, because this might not be the function
2309 // that overload resolution actually selects.
John McCallba135432009-11-21 08:51:07 +00002310 if (DiagnoseUseOfDecl(VD, Loc))
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002311 return ExprError();
2312
Steve Naroffdd972f22008-09-05 22:11:13 +00002313 // Only create DeclRefExpr's for valid Decl's.
2314 if (VD->isInvalidDecl())
Sebastian Redlcd965b92009-01-18 18:53:16 +00002315 return ExprError();
2316
John McCall5808ce42011-02-03 08:15:49 +00002317 // Handle members of anonymous structs and unions. If we got here,
2318 // and the reference is to a class member indirect field, then this
2319 // must be the subject of a pointer-to-member expression.
2320 if (IndirectFieldDecl *indirectField = dyn_cast<IndirectFieldDecl>(VD))
2321 if (!indirectField->isCXXClassMember())
2322 return BuildAnonymousStructUnionMemberReference(SS, NameInfo.getLoc(),
2323 indirectField);
Francois Pichet87c2e122010-11-21 06:08:52 +00002324
Chris Lattner639e2d32008-10-20 05:16:36 +00002325 // If the identifier reference is inside a block, and it refers to a value
2326 // that is outside the block, create a BlockDeclRefExpr instead of a
2327 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when
2328 // the block is formed.
Steve Naroffdd972f22008-09-05 22:11:13 +00002329 //
Chris Lattner639e2d32008-10-20 05:16:36 +00002330 // We do not do this for things like enum constants, global variables, etc,
2331 // as they do not get snapshotted.
2332 //
John McCall6b5a61b2011-02-07 10:33:21 +00002333 switch (shouldCaptureValueReference(*this, NameInfo.getLoc(), VD)) {
John McCall469a1eb2011-02-02 13:00:07 +00002334 case CR_Error:
2335 return ExprError();
Mike Stump0d6fd572010-01-05 02:56:35 +00002336
John McCall469a1eb2011-02-02 13:00:07 +00002337 case CR_Capture:
John McCall6b5a61b2011-02-07 10:33:21 +00002338 assert(!SS.isSet() && "referenced local variable with scope specifier?");
2339 return BuildBlockDeclRefExpr(*this, VD, NameInfo, /*byref*/ false);
2340
2341 case CR_CaptureByRef:
2342 assert(!SS.isSet() && "referenced local variable with scope specifier?");
2343 return BuildBlockDeclRefExpr(*this, VD, NameInfo, /*byref*/ true);
John McCall76a40212011-02-09 01:13:10 +00002344
2345 case CR_NoCapture: {
2346 // If this reference is not in a block or if the referenced
2347 // variable is within the block, create a normal DeclRefExpr.
2348
2349 QualType type = VD->getType();
Daniel Dunbarb20de812011-02-10 18:29:28 +00002350 ExprValueKind valueKind = VK_RValue;
John McCall76a40212011-02-09 01:13:10 +00002351
2352 switch (D->getKind()) {
2353 // Ignore all the non-ValueDecl kinds.
2354#define ABSTRACT_DECL(kind)
2355#define VALUE(type, base)
2356#define DECL(type, base) \
2357 case Decl::type:
2358#include "clang/AST/DeclNodes.inc"
2359 llvm_unreachable("invalid value decl kind");
2360 return ExprError();
2361
2362 // These shouldn't make it here.
2363 case Decl::ObjCAtDefsField:
2364 case Decl::ObjCIvar:
2365 llvm_unreachable("forming non-member reference to ivar?");
2366 return ExprError();
2367
2368 // Enum constants are always r-values and never references.
2369 // Unresolved using declarations are dependent.
2370 case Decl::EnumConstant:
2371 case Decl::UnresolvedUsingValue:
2372 valueKind = VK_RValue;
2373 break;
2374
2375 // Fields and indirect fields that got here must be for
2376 // pointer-to-member expressions; we just call them l-values for
2377 // internal consistency, because this subexpression doesn't really
2378 // exist in the high-level semantics.
2379 case Decl::Field:
2380 case Decl::IndirectField:
2381 assert(getLangOptions().CPlusPlus &&
2382 "building reference to field in C?");
2383
2384 // These can't have reference type in well-formed programs, but
2385 // for internal consistency we do this anyway.
2386 type = type.getNonReferenceType();
2387 valueKind = VK_LValue;
2388 break;
2389
2390 // Non-type template parameters are either l-values or r-values
2391 // depending on the type.
2392 case Decl::NonTypeTemplateParm: {
2393 if (const ReferenceType *reftype = type->getAs<ReferenceType>()) {
2394 type = reftype->getPointeeType();
2395 valueKind = VK_LValue; // even if the parameter is an r-value reference
2396 break;
2397 }
2398
2399 // For non-references, we need to strip qualifiers just in case
2400 // the template parameter was declared as 'const int' or whatever.
2401 valueKind = VK_RValue;
2402 type = type.getUnqualifiedType();
2403 break;
2404 }
2405
2406 case Decl::Var:
2407 // In C, "extern void blah;" is valid and is an r-value.
2408 if (!getLangOptions().CPlusPlus &&
2409 !type.hasQualifiers() &&
2410 type->isVoidType()) {
2411 valueKind = VK_RValue;
2412 break;
2413 }
2414 // fallthrough
2415
2416 case Decl::ImplicitParam:
2417 case Decl::ParmVar:
2418 // These are always l-values.
2419 valueKind = VK_LValue;
2420 type = type.getNonReferenceType();
2421 break;
2422
2423 case Decl::Function: {
John McCall755d8492011-04-12 00:42:48 +00002424 const FunctionType *fty = type->castAs<FunctionType>();
2425
2426 // If we're referring to a function with an __unknown_anytype
2427 // result type, make the entire expression __unknown_anytype.
2428 if (fty->getResultType() == Context.UnknownAnyTy) {
2429 type = Context.UnknownAnyTy;
2430 valueKind = VK_RValue;
2431 break;
2432 }
2433
John McCall76a40212011-02-09 01:13:10 +00002434 // Functions are l-values in C++.
2435 if (getLangOptions().CPlusPlus) {
2436 valueKind = VK_LValue;
2437 break;
2438 }
2439
2440 // C99 DR 316 says that, if a function type comes from a
2441 // function definition (without a prototype), that type is only
2442 // used for checking compatibility. Therefore, when referencing
2443 // the function, we pretend that we don't have the full function
2444 // type.
John McCall755d8492011-04-12 00:42:48 +00002445 if (!cast<FunctionDecl>(VD)->hasPrototype() &&
2446 isa<FunctionProtoType>(fty))
2447 type = Context.getFunctionNoProtoType(fty->getResultType(),
2448 fty->getExtInfo());
John McCall76a40212011-02-09 01:13:10 +00002449
2450 // Functions are r-values in C.
2451 valueKind = VK_RValue;
2452 break;
2453 }
2454
2455 case Decl::CXXMethod:
John McCall755d8492011-04-12 00:42:48 +00002456 // If we're referring to a method with an __unknown_anytype
2457 // result type, make the entire expression __unknown_anytype.
2458 // This should only be possible with a type written directly.
Richard Trieu67e29332011-08-02 04:35:43 +00002459 if (const FunctionProtoType *proto
2460 = dyn_cast<FunctionProtoType>(VD->getType()))
John McCall755d8492011-04-12 00:42:48 +00002461 if (proto->getResultType() == Context.UnknownAnyTy) {
2462 type = Context.UnknownAnyTy;
2463 valueKind = VK_RValue;
2464 break;
2465 }
2466
John McCall76a40212011-02-09 01:13:10 +00002467 // C++ methods are l-values if static, r-values if non-static.
2468 if (cast<CXXMethodDecl>(VD)->isStatic()) {
2469 valueKind = VK_LValue;
2470 break;
2471 }
2472 // fallthrough
2473
2474 case Decl::CXXConversion:
2475 case Decl::CXXDestructor:
2476 case Decl::CXXConstructor:
2477 valueKind = VK_RValue;
2478 break;
2479 }
2480
2481 return BuildDeclRefExpr(VD, type, valueKind, NameInfo, &SS);
2482 }
2483
John McCall469a1eb2011-02-02 13:00:07 +00002484 }
John McCallf89e55a2010-11-18 06:31:45 +00002485
John McCall6b5a61b2011-02-07 10:33:21 +00002486 llvm_unreachable("unknown capture result");
2487 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00002488}
2489
John McCall755d8492011-04-12 00:42:48 +00002490ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind) {
Chris Lattnerd9f69102008-08-10 01:53:14 +00002491 PredefinedExpr::IdentType IT;
Sebastian Redlcd965b92009-01-18 18:53:16 +00002492
Reid Spencer5f016e22007-07-11 17:01:13 +00002493 switch (Kind) {
David Blaikieb219cfc2011-09-23 05:06:16 +00002494 default: llvm_unreachable("Unknown simple primary expr!");
Chris Lattnerd9f69102008-08-10 01:53:14 +00002495 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2]
2496 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break;
2497 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00002498 }
Chris Lattner1423ea42008-01-12 18:39:25 +00002499
Chris Lattnerfa28b302008-01-12 08:14:25 +00002500 // Pre-defined identifiers are of type char[x], where x is the length of the
2501 // string.
Mike Stump1eb44332009-09-09 15:08:12 +00002502
Anders Carlsson3a082d82009-09-08 18:24:21 +00002503 Decl *currentDecl = getCurFunctionOrMethodDecl();
Fariborz Jahanianeb024ac2010-07-23 21:53:24 +00002504 if (!currentDecl && getCurBlock())
2505 currentDecl = getCurBlock()->TheDecl;
Anders Carlsson3a082d82009-09-08 18:24:21 +00002506 if (!currentDecl) {
Chris Lattnerb0da9232008-12-12 05:05:20 +00002507 Diag(Loc, diag::ext_predef_outside_function);
Anders Carlsson3a082d82009-09-08 18:24:21 +00002508 currentDecl = Context.getTranslationUnitDecl();
Chris Lattnerb0da9232008-12-12 05:05:20 +00002509 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002510
Anders Carlsson773f3972009-09-11 01:22:35 +00002511 QualType ResTy;
2512 if (cast<DeclContext>(currentDecl)->isDependentContext()) {
2513 ResTy = Context.DependentTy;
2514 } else {
Anders Carlsson848fa642010-02-11 18:20:28 +00002515 unsigned Length = PredefinedExpr::ComputeName(IT, currentDecl).length();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002516
Anders Carlsson773f3972009-09-11 01:22:35 +00002517 llvm::APInt LengthI(32, Length + 1);
John McCall0953e762009-09-24 19:53:00 +00002518 ResTy = Context.CharTy.withConst();
Anders Carlsson773f3972009-09-11 01:22:35 +00002519 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0);
2520 }
Steve Naroff6ece14c2009-01-21 00:14:39 +00002521 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT));
Reid Spencer5f016e22007-07-11 17:01:13 +00002522}
2523
John McCall60d7b3a2010-08-24 06:29:42 +00002524ExprResult Sema::ActOnCharacterConstant(const Token &Tok) {
Reid Spencer5f016e22007-07-11 17:01:13 +00002525 llvm::SmallString<16> CharBuffer;
Douglas Gregor453091c2010-03-16 22:30:13 +00002526 bool Invalid = false;
Chris Lattner5f9e2722011-07-23 10:55:15 +00002527 StringRef ThisTok = PP.getSpelling(Tok, CharBuffer, &Invalid);
Douglas Gregor453091c2010-03-16 22:30:13 +00002528 if (Invalid)
2529 return ExprError();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002530
Benjamin Kramerddeea562010-02-27 13:44:12 +00002531 CharLiteralParser Literal(ThisTok.begin(), ThisTok.end(), Tok.getLocation(),
Douglas Gregor5cee1192011-07-27 05:40:30 +00002532 PP, Tok.getKind());
Reid Spencer5f016e22007-07-11 17:01:13 +00002533 if (Literal.hadError())
Sebastian Redlcd965b92009-01-18 18:53:16 +00002534 return ExprError();
Chris Lattnerfc62bfd2008-03-01 08:32:21 +00002535
Chris Lattnere8337df2009-12-30 21:19:39 +00002536 QualType Ty;
2537 if (!getLangOptions().CPlusPlus)
2538 Ty = Context.IntTy; // 'x' and L'x' -> int in C.
2539 else if (Literal.isWide())
2540 Ty = Context.WCharTy; // L'x' -> wchar_t in C++.
Douglas Gregor5cee1192011-07-27 05:40:30 +00002541 else if (Literal.isUTF16())
2542 Ty = Context.Char16Ty; // u'x' -> char16_t in C++0x.
2543 else if (Literal.isUTF32())
2544 Ty = Context.Char32Ty; // U'x' -> char32_t in C++0x.
Eli Friedman136b0cd2010-02-03 18:21:45 +00002545 else if (Literal.isMultiChar())
2546 Ty = Context.IntTy; // 'wxyz' -> int in C++.
Chris Lattnere8337df2009-12-30 21:19:39 +00002547 else
2548 Ty = Context.CharTy; // 'x' -> char in C++
Chris Lattnerfc62bfd2008-03-01 08:32:21 +00002549
Douglas Gregor5cee1192011-07-27 05:40:30 +00002550 CharacterLiteral::CharacterKind Kind = CharacterLiteral::Ascii;
2551 if (Literal.isWide())
2552 Kind = CharacterLiteral::Wide;
2553 else if (Literal.isUTF16())
2554 Kind = CharacterLiteral::UTF16;
2555 else if (Literal.isUTF32())
2556 Kind = CharacterLiteral::UTF32;
2557
2558 return Owned(new (Context) CharacterLiteral(Literal.getValue(), Kind, Ty,
2559 Tok.getLocation()));
Reid Spencer5f016e22007-07-11 17:01:13 +00002560}
2561
John McCall60d7b3a2010-08-24 06:29:42 +00002562ExprResult Sema::ActOnNumericConstant(const Token &Tok) {
Sebastian Redlcd965b92009-01-18 18:53:16 +00002563 // Fast path for a single digit (which is quite common). A single digit
Reid Spencer5f016e22007-07-11 17:01:13 +00002564 // cannot have a trigraph, escaped newline, radix prefix, or type suffix.
2565 if (Tok.getLength() == 1) {
Chris Lattner7216dc92009-01-26 22:36:52 +00002566 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok);
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002567 unsigned IntSize = Context.getTargetInfo().getIntWidth();
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002568 return Owned(IntegerLiteral::Create(Context, llvm::APInt(IntSize, Val-'0'),
Steve Naroff0a473932009-01-20 19:53:53 +00002569 Context.IntTy, Tok.getLocation()));
Reid Spencer5f016e22007-07-11 17:01:13 +00002570 }
Ted Kremenek28396602009-01-13 23:19:12 +00002571
Reid Spencer5f016e22007-07-11 17:01:13 +00002572 llvm::SmallString<512> IntegerBuffer;
Chris Lattner2a299042008-09-30 20:53:45 +00002573 // Add padding so that NumericLiteralParser can overread by one character.
2574 IntegerBuffer.resize(Tok.getLength()+1);
Reid Spencer5f016e22007-07-11 17:01:13 +00002575 const char *ThisTokBegin = &IntegerBuffer[0];
Sebastian Redlcd965b92009-01-18 18:53:16 +00002576
Reid Spencer5f016e22007-07-11 17:01:13 +00002577 // Get the spelling of the token, which eliminates trigraphs, etc.
Douglas Gregor453091c2010-03-16 22:30:13 +00002578 bool Invalid = false;
2579 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin, &Invalid);
2580 if (Invalid)
2581 return ExprError();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002582
Mike Stump1eb44332009-09-09 15:08:12 +00002583 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength,
Reid Spencer5f016e22007-07-11 17:01:13 +00002584 Tok.getLocation(), PP);
2585 if (Literal.hadError)
Sebastian Redlcd965b92009-01-18 18:53:16 +00002586 return ExprError();
2587
Chris Lattner5d661452007-08-26 03:42:43 +00002588 Expr *Res;
Sebastian Redlcd965b92009-01-18 18:53:16 +00002589
Chris Lattner5d661452007-08-26 03:42:43 +00002590 if (Literal.isFloatingLiteral()) {
Chris Lattner525a0502007-09-22 18:29:59 +00002591 QualType Ty;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002592 if (Literal.isFloat)
Chris Lattner525a0502007-09-22 18:29:59 +00002593 Ty = Context.FloatTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002594 else if (!Literal.isLong)
Chris Lattner525a0502007-09-22 18:29:59 +00002595 Ty = Context.DoubleTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002596 else
Chris Lattner9e9b6dc2008-03-08 08:52:55 +00002597 Ty = Context.LongDoubleTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002598
2599 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty);
2600
John McCall94c939d2009-12-24 09:08:04 +00002601 using llvm::APFloat;
2602 APFloat Val(Format);
2603
2604 APFloat::opStatus result = Literal.GetFloatValue(Val);
John McCall9f2df882009-12-24 11:09:08 +00002605
2606 // Overflow is always an error, but underflow is only an error if
2607 // we underflowed to zero (APFloat reports denormals as underflow).
2608 if ((result & APFloat::opOverflow) ||
2609 ((result & APFloat::opUnderflow) && Val.isZero())) {
John McCall94c939d2009-12-24 09:08:04 +00002610 unsigned diagnostic;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002611 llvm::SmallString<20> buffer;
John McCall94c939d2009-12-24 09:08:04 +00002612 if (result & APFloat::opOverflow) {
John McCall2a0d7572010-02-26 23:35:57 +00002613 diagnostic = diag::warn_float_overflow;
John McCall94c939d2009-12-24 09:08:04 +00002614 APFloat::getLargest(Format).toString(buffer);
2615 } else {
John McCall2a0d7572010-02-26 23:35:57 +00002616 diagnostic = diag::warn_float_underflow;
John McCall94c939d2009-12-24 09:08:04 +00002617 APFloat::getSmallest(Format).toString(buffer);
2618 }
2619
2620 Diag(Tok.getLocation(), diagnostic)
2621 << Ty
Chris Lattner5f9e2722011-07-23 10:55:15 +00002622 << StringRef(buffer.data(), buffer.size());
John McCall94c939d2009-12-24 09:08:04 +00002623 }
2624
2625 bool isExact = (result == APFloat::opOK);
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002626 Res = FloatingLiteral::Create(Context, Val, isExact, Ty, Tok.getLocation());
Sebastian Redlcd965b92009-01-18 18:53:16 +00002627
Peter Collingbournef4f7cb82011-03-11 19:24:59 +00002628 if (Ty == Context.DoubleTy) {
2629 if (getLangOptions().SinglePrecisionConstants) {
John Wiegley429bb272011-04-08 18:41:53 +00002630 Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).take();
Peter Collingbournef4f7cb82011-03-11 19:24:59 +00002631 } else if (getLangOptions().OpenCL && !getOpenCLOptions().cl_khr_fp64) {
2632 Diag(Tok.getLocation(), diag::warn_double_const_requires_fp64);
John Wiegley429bb272011-04-08 18:41:53 +00002633 Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).take();
Peter Collingbournef4f7cb82011-03-11 19:24:59 +00002634 }
2635 }
Chris Lattner5d661452007-08-26 03:42:43 +00002636 } else if (!Literal.isIntegerLiteral()) {
Sebastian Redlcd965b92009-01-18 18:53:16 +00002637 return ExprError();
Chris Lattner5d661452007-08-26 03:42:43 +00002638 } else {
Chris Lattnerf0467b32008-04-02 04:24:33 +00002639 QualType Ty;
Reid Spencer5f016e22007-07-11 17:01:13 +00002640
Neil Boothb9449512007-08-29 22:00:19 +00002641 // long long is a C99 feature.
Richard Smithebaf0e62011-10-18 20:49:44 +00002642 if (!getLangOptions().C99 && Literal.isLongLong)
2643 Diag(Tok.getLocation(),
2644 getLangOptions().CPlusPlus0x ?
2645 diag::warn_cxx98_compat_longlong : diag::ext_longlong);
Neil Boothb9449512007-08-29 22:00:19 +00002646
Reid Spencer5f016e22007-07-11 17:01:13 +00002647 // Get the value in the widest-possible width.
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002648 llvm::APInt ResultVal(Context.getTargetInfo().getIntMaxTWidth(), 0);
Sebastian Redlcd965b92009-01-18 18:53:16 +00002649
Reid Spencer5f016e22007-07-11 17:01:13 +00002650 if (Literal.GetIntegerValue(ResultVal)) {
2651 // If this value didn't fit into uintmax_t, warn and force to ull.
2652 Diag(Tok.getLocation(), diag::warn_integer_too_large);
Chris Lattnerf0467b32008-04-02 04:24:33 +00002653 Ty = Context.UnsignedLongLongTy;
2654 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() &&
Chris Lattner98be4942008-03-05 18:54:05 +00002655 "long long is not intmax_t?");
Reid Spencer5f016e22007-07-11 17:01:13 +00002656 } else {
2657 // If this value fits into a ULL, try to figure out what else it fits into
2658 // according to the rules of C99 6.4.4.1p5.
Sebastian Redlcd965b92009-01-18 18:53:16 +00002659
Reid Spencer5f016e22007-07-11 17:01:13 +00002660 // Octal, Hexadecimal, and integers with a U suffix are allowed to
2661 // be an unsigned int.
2662 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10;
2663
2664 // Check from smallest to largest, picking the smallest type we can.
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002665 unsigned Width = 0;
Chris Lattner97c51562007-08-23 21:58:08 +00002666 if (!Literal.isLong && !Literal.isLongLong) {
2667 // Are int/unsigned possibilities?
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002668 unsigned IntSize = Context.getTargetInfo().getIntWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002669
Reid Spencer5f016e22007-07-11 17:01:13 +00002670 // Does it fit in a unsigned int?
2671 if (ResultVal.isIntN(IntSize)) {
2672 // Does it fit in a signed int?
2673 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002674 Ty = Context.IntTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00002675 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002676 Ty = Context.UnsignedIntTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002677 Width = IntSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00002678 }
Reid Spencer5f016e22007-07-11 17:01:13 +00002679 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002680
Reid Spencer5f016e22007-07-11 17:01:13 +00002681 // Are long/unsigned long possibilities?
Chris Lattnerf0467b32008-04-02 04:24:33 +00002682 if (Ty.isNull() && !Literal.isLongLong) {
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002683 unsigned LongSize = Context.getTargetInfo().getLongWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002684
Reid Spencer5f016e22007-07-11 17:01:13 +00002685 // Does it fit in a unsigned long?
2686 if (ResultVal.isIntN(LongSize)) {
2687 // Does it fit in a signed long?
2688 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002689 Ty = Context.LongTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00002690 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002691 Ty = Context.UnsignedLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002692 Width = LongSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00002693 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002694 }
2695
Reid Spencer5f016e22007-07-11 17:01:13 +00002696 // Finally, check long long if needed.
Chris Lattnerf0467b32008-04-02 04:24:33 +00002697 if (Ty.isNull()) {
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002698 unsigned LongLongSize = Context.getTargetInfo().getLongLongWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002699
Reid Spencer5f016e22007-07-11 17:01:13 +00002700 // Does it fit in a unsigned long long?
2701 if (ResultVal.isIntN(LongLongSize)) {
2702 // Does it fit in a signed long long?
Francois Pichet24323202011-01-11 23:38:13 +00002703 // To be compatible with MSVC, hex integer literals ending with the
2704 // LL or i64 suffix are always signed in Microsoft mode.
Francois Picheta15a5ee2011-01-11 12:23:00 +00002705 if (!Literal.isUnsigned && (ResultVal[LongLongSize-1] == 0 ||
Francois Pichet62ec1f22011-09-17 17:15:52 +00002706 (getLangOptions().MicrosoftExt && Literal.isLongLong)))
Chris Lattnerf0467b32008-04-02 04:24:33 +00002707 Ty = Context.LongLongTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00002708 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002709 Ty = Context.UnsignedLongLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002710 Width = LongLongSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00002711 }
2712 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002713
Reid Spencer5f016e22007-07-11 17:01:13 +00002714 // If we still couldn't decide a type, we probably have something that
2715 // does not fit in a signed long long, but has no U suffix.
Chris Lattnerf0467b32008-04-02 04:24:33 +00002716 if (Ty.isNull()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00002717 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed);
Chris Lattnerf0467b32008-04-02 04:24:33 +00002718 Ty = Context.UnsignedLongLongTy;
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002719 Width = Context.getTargetInfo().getLongLongWidth();
Reid Spencer5f016e22007-07-11 17:01:13 +00002720 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002721
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002722 if (ResultVal.getBitWidth() != Width)
Jay Foad9f71a8f2010-12-07 08:25:34 +00002723 ResultVal = ResultVal.trunc(Width);
Reid Spencer5f016e22007-07-11 17:01:13 +00002724 }
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002725 Res = IntegerLiteral::Create(Context, ResultVal, Ty, Tok.getLocation());
Reid Spencer5f016e22007-07-11 17:01:13 +00002726 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002727
Chris Lattner5d661452007-08-26 03:42:43 +00002728 // If this is an imaginary literal, create the ImaginaryLiteral wrapper.
2729 if (Literal.isImaginary)
Mike Stump1eb44332009-09-09 15:08:12 +00002730 Res = new (Context) ImaginaryLiteral(Res,
Steve Naroff6ece14c2009-01-21 00:14:39 +00002731 Context.getComplexType(Res->getType()));
Sebastian Redlcd965b92009-01-18 18:53:16 +00002732
2733 return Owned(Res);
Reid Spencer5f016e22007-07-11 17:01:13 +00002734}
2735
Richard Trieuccd891a2011-09-09 01:45:06 +00002736ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, Expr *E) {
Chris Lattnerf0467b32008-04-02 04:24:33 +00002737 assert((E != 0) && "ActOnParenExpr() missing expr");
Steve Naroff6ece14c2009-01-21 00:14:39 +00002738 return Owned(new (Context) ParenExpr(L, R, E));
Reid Spencer5f016e22007-07-11 17:01:13 +00002739}
2740
Chandler Carruthdf1f3772011-05-26 08:53:12 +00002741static bool CheckVecStepTraitOperandType(Sema &S, QualType T,
2742 SourceLocation Loc,
2743 SourceRange ArgRange) {
2744 // [OpenCL 1.1 6.11.12] "The vec_step built-in function takes a built-in
2745 // scalar or vector data type argument..."
2746 // Every built-in scalar type (OpenCL 1.1 6.1.1) is either an arithmetic
2747 // type (C99 6.2.5p18) or void.
2748 if (!(T->isArithmeticType() || T->isVoidType() || T->isVectorType())) {
2749 S.Diag(Loc, diag::err_vecstep_non_scalar_vector_type)
2750 << T << ArgRange;
2751 return true;
2752 }
2753
2754 assert((T->isVoidType() || !T->isIncompleteType()) &&
2755 "Scalar types should always be complete");
2756 return false;
2757}
2758
Chandler Carruth42ec65d2011-05-26 08:53:16 +00002759static bool CheckExtensionTraitOperandType(Sema &S, QualType T,
2760 SourceLocation Loc,
2761 SourceRange ArgRange,
2762 UnaryExprOrTypeTrait TraitKind) {
2763 // C99 6.5.3.4p1:
2764 if (T->isFunctionType()) {
2765 // alignof(function) is allowed as an extension.
2766 if (TraitKind == UETT_SizeOf)
2767 S.Diag(Loc, diag::ext_sizeof_function_type) << ArgRange;
2768 return false;
2769 }
2770
2771 // Allow sizeof(void)/alignof(void) as an extension.
2772 if (T->isVoidType()) {
2773 S.Diag(Loc, diag::ext_sizeof_void_type) << TraitKind << ArgRange;
2774 return false;
2775 }
2776
2777 return true;
2778}
2779
2780static bool CheckObjCTraitOperandConstraints(Sema &S, QualType T,
2781 SourceLocation Loc,
2782 SourceRange ArgRange,
2783 UnaryExprOrTypeTrait TraitKind) {
2784 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode.
2785 if (S.LangOpts.ObjCNonFragileABI && T->isObjCObjectType()) {
2786 S.Diag(Loc, diag::err_sizeof_nonfragile_interface)
2787 << T << (TraitKind == UETT_SizeOf)
2788 << ArgRange;
2789 return true;
2790 }
2791
2792 return false;
2793}
2794
Chandler Carruth9d342d02011-05-26 08:53:10 +00002795/// \brief Check the constrains on expression operands to unary type expression
2796/// and type traits.
2797///
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002798/// Completes any types necessary and validates the constraints on the operand
2799/// expression. The logic mostly mirrors the type-based overload, but may modify
2800/// the expression as it completes the type for that expression through template
2801/// instantiation, etc.
Richard Trieuccd891a2011-09-09 01:45:06 +00002802bool Sema::CheckUnaryExprOrTypeTraitOperand(Expr *E,
Chandler Carruth9d342d02011-05-26 08:53:10 +00002803 UnaryExprOrTypeTrait ExprKind) {
Richard Trieuccd891a2011-09-09 01:45:06 +00002804 QualType ExprTy = E->getType();
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002805
2806 // C++ [expr.sizeof]p2: "When applied to a reference or a reference type,
2807 // the result is the size of the referenced type."
2808 // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the
2809 // result shall be the alignment of the referenced type."
2810 if (const ReferenceType *Ref = ExprTy->getAs<ReferenceType>())
2811 ExprTy = Ref->getPointeeType();
2812
2813 if (ExprKind == UETT_VecStep)
Richard Trieuccd891a2011-09-09 01:45:06 +00002814 return CheckVecStepTraitOperandType(*this, ExprTy, E->getExprLoc(),
2815 E->getSourceRange());
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002816
2817 // Whitelist some types as extensions
Richard Trieuccd891a2011-09-09 01:45:06 +00002818 if (!CheckExtensionTraitOperandType(*this, ExprTy, E->getExprLoc(),
2819 E->getSourceRange(), ExprKind))
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002820 return false;
2821
Richard Trieuccd891a2011-09-09 01:45:06 +00002822 if (RequireCompleteExprType(E,
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002823 PDiag(diag::err_sizeof_alignof_incomplete_type)
Richard Trieuccd891a2011-09-09 01:45:06 +00002824 << ExprKind << E->getSourceRange(),
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002825 std::make_pair(SourceLocation(), PDiag(0))))
2826 return true;
2827
2828 // Completeing the expression's type may have changed it.
Richard Trieuccd891a2011-09-09 01:45:06 +00002829 ExprTy = E->getType();
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002830 if (const ReferenceType *Ref = ExprTy->getAs<ReferenceType>())
2831 ExprTy = Ref->getPointeeType();
2832
Richard Trieuccd891a2011-09-09 01:45:06 +00002833 if (CheckObjCTraitOperandConstraints(*this, ExprTy, E->getExprLoc(),
2834 E->getSourceRange(), ExprKind))
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002835 return true;
2836
Nico Webercf739922011-06-15 02:47:03 +00002837 if (ExprKind == UETT_SizeOf) {
Richard Trieuccd891a2011-09-09 01:45:06 +00002838 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
Nico Webercf739922011-06-15 02:47:03 +00002839 if (ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(DeclRef->getFoundDecl())) {
2840 QualType OType = PVD->getOriginalType();
2841 QualType Type = PVD->getType();
2842 if (Type->isPointerType() && OType->isArrayType()) {
Richard Trieuccd891a2011-09-09 01:45:06 +00002843 Diag(E->getExprLoc(), diag::warn_sizeof_array_param)
Nico Webercf739922011-06-15 02:47:03 +00002844 << Type << OType;
2845 Diag(PVD->getLocation(), diag::note_declared_at);
2846 }
2847 }
2848 }
2849 }
2850
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002851 return false;
Chandler Carruth9d342d02011-05-26 08:53:10 +00002852}
2853
2854/// \brief Check the constraints on operands to unary expression and type
2855/// traits.
2856///
2857/// This will complete any types necessary, and validate the various constraints
2858/// on those operands.
2859///
Reid Spencer5f016e22007-07-11 17:01:13 +00002860/// The UsualUnaryConversions() function is *not* called by this routine.
Chandler Carruth9d342d02011-05-26 08:53:10 +00002861/// C99 6.3.2.1p[2-4] all state:
2862/// Except when it is the operand of the sizeof operator ...
2863///
2864/// C++ [expr.sizeof]p4
2865/// The lvalue-to-rvalue, array-to-pointer, and function-to-pointer
2866/// standard conversions are not applied to the operand of sizeof.
2867///
2868/// This policy is followed for all of the unary trait expressions.
Richard Trieuccd891a2011-09-09 01:45:06 +00002869bool Sema::CheckUnaryExprOrTypeTraitOperand(QualType ExprType,
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002870 SourceLocation OpLoc,
2871 SourceRange ExprRange,
2872 UnaryExprOrTypeTrait ExprKind) {
Richard Trieuccd891a2011-09-09 01:45:06 +00002873 if (ExprType->isDependentType())
Sebastian Redl28507842009-02-26 14:39:58 +00002874 return false;
2875
Sebastian Redl5d484e82009-11-23 17:18:46 +00002876 // C++ [expr.sizeof]p2: "When applied to a reference or a reference type,
2877 // the result is the size of the referenced type."
2878 // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the
2879 // result shall be the alignment of the referenced type."
Richard Trieuccd891a2011-09-09 01:45:06 +00002880 if (const ReferenceType *Ref = ExprType->getAs<ReferenceType>())
2881 ExprType = Ref->getPointeeType();
Sebastian Redl5d484e82009-11-23 17:18:46 +00002882
Chandler Carruthdf1f3772011-05-26 08:53:12 +00002883 if (ExprKind == UETT_VecStep)
Richard Trieuccd891a2011-09-09 01:45:06 +00002884 return CheckVecStepTraitOperandType(*this, ExprType, OpLoc, ExprRange);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002885
Chandler Carruth42ec65d2011-05-26 08:53:16 +00002886 // Whitelist some types as extensions
Richard Trieuccd891a2011-09-09 01:45:06 +00002887 if (!CheckExtensionTraitOperandType(*this, ExprType, OpLoc, ExprRange,
Chandler Carruth42ec65d2011-05-26 08:53:16 +00002888 ExprKind))
Chris Lattner01072922009-01-24 19:46:37 +00002889 return false;
Mike Stump1eb44332009-09-09 15:08:12 +00002890
Richard Trieuccd891a2011-09-09 01:45:06 +00002891 if (RequireCompleteType(OpLoc, ExprType,
Douglas Gregor5cc07df2009-12-15 16:44:32 +00002892 PDiag(diag::err_sizeof_alignof_incomplete_type)
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002893 << ExprKind << ExprRange))
Chris Lattner1efaa952009-04-24 00:30:45 +00002894 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00002895
Richard Trieuccd891a2011-09-09 01:45:06 +00002896 if (CheckObjCTraitOperandConstraints(*this, ExprType, OpLoc, ExprRange,
Chandler Carruth42ec65d2011-05-26 08:53:16 +00002897 ExprKind))
Chris Lattner5cb10d32009-04-24 22:30:50 +00002898 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00002899
Chris Lattner1efaa952009-04-24 00:30:45 +00002900 return false;
Reid Spencer5f016e22007-07-11 17:01:13 +00002901}
2902
Chandler Carruth9d342d02011-05-26 08:53:10 +00002903static bool CheckAlignOfExpr(Sema &S, Expr *E) {
Chris Lattner31e21e02009-01-24 20:17:12 +00002904 E = E->IgnoreParens();
Sebastian Redl28507842009-02-26 14:39:58 +00002905
Mike Stump1eb44332009-09-09 15:08:12 +00002906 // alignof decl is always ok.
Chris Lattner31e21e02009-01-24 20:17:12 +00002907 if (isa<DeclRefExpr>(E))
2908 return false;
Sebastian Redl28507842009-02-26 14:39:58 +00002909
2910 // Cannot know anything else if the expression is dependent.
2911 if (E->isTypeDependent())
2912 return false;
2913
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002914 if (E->getBitField()) {
Chandler Carruth9d342d02011-05-26 08:53:10 +00002915 S.Diag(E->getExprLoc(), diag::err_sizeof_alignof_bitfield)
2916 << 1 << E->getSourceRange();
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002917 return true;
Chris Lattner31e21e02009-01-24 20:17:12 +00002918 }
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002919
2920 // Alignment of a field access is always okay, so long as it isn't a
2921 // bit-field.
2922 if (MemberExpr *ME = dyn_cast<MemberExpr>(E))
Mike Stump8e1fab22009-07-22 18:58:19 +00002923 if (isa<FieldDecl>(ME->getMemberDecl()))
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002924 return false;
2925
Chandler Carruth9d342d02011-05-26 08:53:10 +00002926 return S.CheckUnaryExprOrTypeTraitOperand(E, UETT_AlignOf);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002927}
2928
Chandler Carruth9d342d02011-05-26 08:53:10 +00002929bool Sema::CheckVecStepExpr(Expr *E) {
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002930 E = E->IgnoreParens();
2931
2932 // Cannot know anything else if the expression is dependent.
2933 if (E->isTypeDependent())
2934 return false;
2935
Chandler Carruth9d342d02011-05-26 08:53:10 +00002936 return CheckUnaryExprOrTypeTraitOperand(E, UETT_VecStep);
Chris Lattner31e21e02009-01-24 20:17:12 +00002937}
2938
Douglas Gregorba498172009-03-13 21:01:28 +00002939/// \brief Build a sizeof or alignof expression given a type operand.
John McCall60d7b3a2010-08-24 06:29:42 +00002940ExprResult
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002941Sema::CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
2942 SourceLocation OpLoc,
2943 UnaryExprOrTypeTrait ExprKind,
2944 SourceRange R) {
John McCalla93c9342009-12-07 02:54:59 +00002945 if (!TInfo)
Douglas Gregorba498172009-03-13 21:01:28 +00002946 return ExprError();
2947
John McCalla93c9342009-12-07 02:54:59 +00002948 QualType T = TInfo->getType();
John McCall5ab75172009-11-04 07:28:41 +00002949
Douglas Gregorba498172009-03-13 21:01:28 +00002950 if (!T->isDependentType() &&
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002951 CheckUnaryExprOrTypeTraitOperand(T, OpLoc, R, ExprKind))
Douglas Gregorba498172009-03-13 21:01:28 +00002952 return ExprError();
2953
2954 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002955 return Owned(new (Context) UnaryExprOrTypeTraitExpr(ExprKind, TInfo,
2956 Context.getSizeType(),
2957 OpLoc, R.getEnd()));
Douglas Gregorba498172009-03-13 21:01:28 +00002958}
2959
2960/// \brief Build a sizeof or alignof expression given an expression
2961/// operand.
John McCall60d7b3a2010-08-24 06:29:42 +00002962ExprResult
Chandler Carruthe72c55b2011-05-29 07:32:14 +00002963Sema::CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
2964 UnaryExprOrTypeTrait ExprKind) {
Douglas Gregor4f0845e2011-06-22 23:21:00 +00002965 ExprResult PE = CheckPlaceholderExpr(E);
2966 if (PE.isInvalid())
2967 return ExprError();
2968
2969 E = PE.get();
2970
Douglas Gregorba498172009-03-13 21:01:28 +00002971 // Verify that the operand is valid.
2972 bool isInvalid = false;
2973 if (E->isTypeDependent()) {
2974 // Delay type-checking for type-dependent expressions.
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002975 } else if (ExprKind == UETT_AlignOf) {
Chandler Carruth9d342d02011-05-26 08:53:10 +00002976 isInvalid = CheckAlignOfExpr(*this, E);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002977 } else if (ExprKind == UETT_VecStep) {
Chandler Carruth9d342d02011-05-26 08:53:10 +00002978 isInvalid = CheckVecStepExpr(E);
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002979 } else if (E->getBitField()) { // C99 6.5.3.4p1.
Chandler Carruth9d342d02011-05-26 08:53:10 +00002980 Diag(E->getExprLoc(), diag::err_sizeof_alignof_bitfield) << 0;
Douglas Gregorba498172009-03-13 21:01:28 +00002981 isInvalid = true;
2982 } else {
Chandler Carruth9d342d02011-05-26 08:53:10 +00002983 isInvalid = CheckUnaryExprOrTypeTraitOperand(E, UETT_SizeOf);
Douglas Gregorba498172009-03-13 21:01:28 +00002984 }
2985
2986 if (isInvalid)
2987 return ExprError();
2988
2989 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
Chandler Carruth9d342d02011-05-26 08:53:10 +00002990 return Owned(new (Context) UnaryExprOrTypeTraitExpr(
Chandler Carruthe72c55b2011-05-29 07:32:14 +00002991 ExprKind, E, Context.getSizeType(), OpLoc,
Chandler Carruth9d342d02011-05-26 08:53:10 +00002992 E->getSourceRange().getEnd()));
Douglas Gregorba498172009-03-13 21:01:28 +00002993}
2994
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002995/// ActOnUnaryExprOrTypeTraitExpr - Handle @c sizeof(type) and @c sizeof @c
2996/// expr and the same for @c alignof and @c __alignof
Sebastian Redl05189992008-11-11 17:56:53 +00002997/// Note that the ArgRange is invalid if isType is false.
John McCall60d7b3a2010-08-24 06:29:42 +00002998ExprResult
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002999Sema::ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00003000 UnaryExprOrTypeTrait ExprKind, bool IsType,
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003001 void *TyOrEx, const SourceRange &ArgRange) {
Reid Spencer5f016e22007-07-11 17:01:13 +00003002 // If error parsing type, ignore.
Sebastian Redl0eb23302009-01-19 00:08:26 +00003003 if (TyOrEx == 0) return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00003004
Richard Trieuccd891a2011-09-09 01:45:06 +00003005 if (IsType) {
John McCalla93c9342009-12-07 02:54:59 +00003006 TypeSourceInfo *TInfo;
John McCallb3d87482010-08-24 05:47:05 +00003007 (void) GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrEx), &TInfo);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003008 return CreateUnaryExprOrTypeTraitExpr(TInfo, OpLoc, ExprKind, ArgRange);
Mike Stump1eb44332009-09-09 15:08:12 +00003009 }
Sebastian Redl05189992008-11-11 17:56:53 +00003010
Douglas Gregorba498172009-03-13 21:01:28 +00003011 Expr *ArgEx = (Expr *)TyOrEx;
Chandler Carruthe72c55b2011-05-29 07:32:14 +00003012 ExprResult Result = CreateUnaryExprOrTypeTraitExpr(ArgEx, OpLoc, ExprKind);
Douglas Gregorba498172009-03-13 21:01:28 +00003013 return move(Result);
Reid Spencer5f016e22007-07-11 17:01:13 +00003014}
3015
John Wiegley429bb272011-04-08 18:41:53 +00003016static QualType CheckRealImagOperand(Sema &S, ExprResult &V, SourceLocation Loc,
Richard Trieuccd891a2011-09-09 01:45:06 +00003017 bool IsReal) {
John Wiegley429bb272011-04-08 18:41:53 +00003018 if (V.get()->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00003019 return S.Context.DependentTy;
Mike Stump1eb44332009-09-09 15:08:12 +00003020
John McCallf6a16482010-12-04 03:47:34 +00003021 // _Real and _Imag are only l-values for normal l-values.
John Wiegley429bb272011-04-08 18:41:53 +00003022 if (V.get()->getObjectKind() != OK_Ordinary) {
3023 V = S.DefaultLvalueConversion(V.take());
3024 if (V.isInvalid())
3025 return QualType();
3026 }
John McCallf6a16482010-12-04 03:47:34 +00003027
Chris Lattnercc26ed72007-08-26 05:39:26 +00003028 // These operators return the element type of a complex type.
John Wiegley429bb272011-04-08 18:41:53 +00003029 if (const ComplexType *CT = V.get()->getType()->getAs<ComplexType>())
Chris Lattnerdbb36972007-08-24 21:16:53 +00003030 return CT->getElementType();
Mike Stump1eb44332009-09-09 15:08:12 +00003031
Chris Lattnercc26ed72007-08-26 05:39:26 +00003032 // Otherwise they pass through real integer and floating point types here.
John Wiegley429bb272011-04-08 18:41:53 +00003033 if (V.get()->getType()->isArithmeticType())
3034 return V.get()->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00003035
John McCall2cd11fe2010-10-12 02:09:17 +00003036 // Test for placeholders.
John McCallfb8721c2011-04-10 19:13:55 +00003037 ExprResult PR = S.CheckPlaceholderExpr(V.get());
John McCall2cd11fe2010-10-12 02:09:17 +00003038 if (PR.isInvalid()) return QualType();
John Wiegley429bb272011-04-08 18:41:53 +00003039 if (PR.get() != V.get()) {
3040 V = move(PR);
Richard Trieuccd891a2011-09-09 01:45:06 +00003041 return CheckRealImagOperand(S, V, Loc, IsReal);
John McCall2cd11fe2010-10-12 02:09:17 +00003042 }
3043
Chris Lattnercc26ed72007-08-26 05:39:26 +00003044 // Reject anything else.
John Wiegley429bb272011-04-08 18:41:53 +00003045 S.Diag(Loc, diag::err_realimag_invalid_type) << V.get()->getType()
Richard Trieuccd891a2011-09-09 01:45:06 +00003046 << (IsReal ? "__real" : "__imag");
Chris Lattnercc26ed72007-08-26 05:39:26 +00003047 return QualType();
Chris Lattnerdbb36972007-08-24 21:16:53 +00003048}
3049
3050
Reid Spencer5f016e22007-07-11 17:01:13 +00003051
John McCall60d7b3a2010-08-24 06:29:42 +00003052ExprResult
Sebastian Redl0eb23302009-01-19 00:08:26 +00003053Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
John McCall9ae2f072010-08-23 23:25:46 +00003054 tok::TokenKind Kind, Expr *Input) {
John McCall2de56d12010-08-25 11:45:40 +00003055 UnaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00003056 switch (Kind) {
David Blaikieb219cfc2011-09-23 05:06:16 +00003057 default: llvm_unreachable("Unknown unary op!");
John McCall2de56d12010-08-25 11:45:40 +00003058 case tok::plusplus: Opc = UO_PostInc; break;
3059 case tok::minusminus: Opc = UO_PostDec; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00003060 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00003061
John McCall9ae2f072010-08-23 23:25:46 +00003062 return BuildUnaryOp(S, OpLoc, Opc, Input);
Reid Spencer5f016e22007-07-11 17:01:13 +00003063}
3064
John McCall60d7b3a2010-08-24 06:29:42 +00003065ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003066Sema::ActOnArraySubscriptExpr(Scope *S, Expr *Base, SourceLocation LLoc,
3067 Expr *Idx, SourceLocation RLoc) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00003068 // Since this might be a postfix expression, get rid of ParenListExprs.
John McCall60d7b3a2010-08-24 06:29:42 +00003069 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
John McCall9ae2f072010-08-23 23:25:46 +00003070 if (Result.isInvalid()) return ExprError();
3071 Base = Result.take();
Nate Begeman2ef13e52009-08-10 23:49:36 +00003072
John McCall9ae2f072010-08-23 23:25:46 +00003073 Expr *LHSExp = Base, *RHSExp = Idx;
Mike Stump1eb44332009-09-09 15:08:12 +00003074
Douglas Gregor337c6b92008-11-19 17:17:41 +00003075 if (getLangOptions().CPlusPlus &&
Douglas Gregor3384c9c2009-05-19 00:01:19 +00003076 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) {
Douglas Gregor3384c9c2009-05-19 00:01:19 +00003077 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
John McCallf89e55a2010-11-18 06:31:45 +00003078 Context.DependentTy,
3079 VK_LValue, OK_Ordinary,
3080 RLoc));
Douglas Gregor3384c9c2009-05-19 00:01:19 +00003081 }
3082
Mike Stump1eb44332009-09-09 15:08:12 +00003083 if (getLangOptions().CPlusPlus &&
Sebastian Redl0eb23302009-01-19 00:08:26 +00003084 (LHSExp->getType()->isRecordType() ||
Eli Friedman03f332a2008-12-15 22:34:21 +00003085 LHSExp->getType()->isEnumeralType() ||
3086 RHSExp->getType()->isRecordType() ||
3087 RHSExp->getType()->isEnumeralType())) {
John McCall9ae2f072010-08-23 23:25:46 +00003088 return CreateOverloadedArraySubscriptExpr(LLoc, RLoc, Base, Idx);
Douglas Gregor337c6b92008-11-19 17:17:41 +00003089 }
3090
John McCall9ae2f072010-08-23 23:25:46 +00003091 return CreateBuiltinArraySubscriptExpr(Base, LLoc, Idx, RLoc);
Sebastian Redlf322ed62009-10-29 20:17:01 +00003092}
3093
3094
John McCall60d7b3a2010-08-24 06:29:42 +00003095ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003096Sema::CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00003097 Expr *Idx, SourceLocation RLoc) {
John McCall9ae2f072010-08-23 23:25:46 +00003098 Expr *LHSExp = Base;
3099 Expr *RHSExp = Idx;
Sebastian Redlf322ed62009-10-29 20:17:01 +00003100
Chris Lattner12d9ff62007-07-16 00:14:47 +00003101 // Perform default conversions.
John Wiegley429bb272011-04-08 18:41:53 +00003102 if (!LHSExp->getType()->getAs<VectorType>()) {
3103 ExprResult Result = DefaultFunctionArrayLvalueConversion(LHSExp);
3104 if (Result.isInvalid())
3105 return ExprError();
3106 LHSExp = Result.take();
3107 }
3108 ExprResult Result = DefaultFunctionArrayLvalueConversion(RHSExp);
3109 if (Result.isInvalid())
3110 return ExprError();
3111 RHSExp = Result.take();
Sebastian Redl0eb23302009-01-19 00:08:26 +00003112
Chris Lattner12d9ff62007-07-16 00:14:47 +00003113 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType();
John McCallf89e55a2010-11-18 06:31:45 +00003114 ExprValueKind VK = VK_LValue;
3115 ExprObjectKind OK = OK_Ordinary;
Reid Spencer5f016e22007-07-11 17:01:13 +00003116
Reid Spencer5f016e22007-07-11 17:01:13 +00003117 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent
Chris Lattner73d0d4f2007-08-30 17:45:32 +00003118 // to the expression *((e1)+(e2)). This means the array "Base" may actually be
Mike Stumpeed9cac2009-02-19 03:04:26 +00003119 // in the subscript position. As a result, we need to derive the array base
Reid Spencer5f016e22007-07-11 17:01:13 +00003120 // and index from the expression types.
Chris Lattner12d9ff62007-07-16 00:14:47 +00003121 Expr *BaseExpr, *IndexExpr;
3122 QualType ResultType;
Sebastian Redl28507842009-02-26 14:39:58 +00003123 if (LHSTy->isDependentType() || RHSTy->isDependentType()) {
3124 BaseExpr = LHSExp;
3125 IndexExpr = RHSExp;
3126 ResultType = Context.DependentTy;
Ted Kremenek6217b802009-07-29 21:53:49 +00003127 } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) {
Chris Lattner12d9ff62007-07-16 00:14:47 +00003128 BaseExpr = LHSExp;
3129 IndexExpr = RHSExp;
Chris Lattner12d9ff62007-07-16 00:14:47 +00003130 ResultType = PTy->getPointeeType();
Ted Kremenek6217b802009-07-29 21:53:49 +00003131 } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) {
Chris Lattner7a2e0472007-07-16 00:23:25 +00003132 // Handle the uncommon case of "123[Ptr]".
Chris Lattner12d9ff62007-07-16 00:14:47 +00003133 BaseExpr = RHSExp;
3134 IndexExpr = LHSExp;
Chris Lattner12d9ff62007-07-16 00:14:47 +00003135 ResultType = PTy->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00003136 } else if (const ObjCObjectPointerType *PTy =
John McCall183700f2009-09-21 23:43:11 +00003137 LHSTy->getAs<ObjCObjectPointerType>()) {
Steve Naroff14108da2009-07-10 23:34:53 +00003138 BaseExpr = LHSExp;
3139 IndexExpr = RHSExp;
3140 ResultType = PTy->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00003141 } else if (const ObjCObjectPointerType *PTy =
John McCall183700f2009-09-21 23:43:11 +00003142 RHSTy->getAs<ObjCObjectPointerType>()) {
Steve Naroff14108da2009-07-10 23:34:53 +00003143 // Handle the uncommon case of "123[Ptr]".
3144 BaseExpr = RHSExp;
3145 IndexExpr = LHSExp;
3146 ResultType = PTy->getPointeeType();
John McCall183700f2009-09-21 23:43:11 +00003147 } else if (const VectorType *VTy = LHSTy->getAs<VectorType>()) {
Chris Lattnerc8629632007-07-31 19:29:30 +00003148 BaseExpr = LHSExp; // vectors: V[123]
Chris Lattner12d9ff62007-07-16 00:14:47 +00003149 IndexExpr = RHSExp;
John McCallf89e55a2010-11-18 06:31:45 +00003150 VK = LHSExp->getValueKind();
3151 if (VK != VK_RValue)
3152 OK = OK_VectorComponent;
Nate Begeman334a8022009-01-18 00:45:31 +00003153
Chris Lattner12d9ff62007-07-16 00:14:47 +00003154 // FIXME: need to deal with const...
3155 ResultType = VTy->getElementType();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003156 } else if (LHSTy->isArrayType()) {
3157 // If we see an array that wasn't promoted by
Douglas Gregora873dfc2010-02-03 00:27:59 +00003158 // DefaultFunctionArrayLvalueConversion, it must be an array that
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003159 // wasn't promoted because of the C90 rule that doesn't
3160 // allow promoting non-lvalue arrays. Warn, then
3161 // force the promotion here.
3162 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
3163 LHSExp->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00003164 LHSExp = ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy),
3165 CK_ArrayToPointerDecay).take();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003166 LHSTy = LHSExp->getType();
3167
3168 BaseExpr = LHSExp;
3169 IndexExpr = RHSExp;
Ted Kremenek6217b802009-07-29 21:53:49 +00003170 ResultType = LHSTy->getAs<PointerType>()->getPointeeType();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003171 } else if (RHSTy->isArrayType()) {
3172 // Same as previous, except for 123[f().a] case
3173 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
3174 RHSExp->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00003175 RHSExp = ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy),
3176 CK_ArrayToPointerDecay).take();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003177 RHSTy = RHSExp->getType();
3178
3179 BaseExpr = RHSExp;
3180 IndexExpr = LHSExp;
Ted Kremenek6217b802009-07-29 21:53:49 +00003181 ResultType = RHSTy->getAs<PointerType>()->getPointeeType();
Reid Spencer5f016e22007-07-11 17:01:13 +00003182 } else {
Chris Lattner338395d2009-04-25 22:50:55 +00003183 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value)
3184 << LHSExp->getSourceRange() << RHSExp->getSourceRange());
Sebastian Redl0eb23302009-01-19 00:08:26 +00003185 }
Reid Spencer5f016e22007-07-11 17:01:13 +00003186 // C99 6.5.2.1p1
Douglas Gregorf6094622010-07-23 15:58:24 +00003187 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent())
Chris Lattner338395d2009-04-25 22:50:55 +00003188 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer)
3189 << IndexExpr->getSourceRange());
Reid Spencer5f016e22007-07-11 17:01:13 +00003190
Daniel Dunbar7e88a602009-09-17 06:31:17 +00003191 if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
Sam Weinig0f9a5b52009-09-14 20:14:57 +00003192 IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
3193 && !IndexExpr->isTypeDependent())
Sam Weinig76e2b712009-09-14 01:58:58 +00003194 Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange();
3195
Douglas Gregore7450f52009-03-24 19:52:54 +00003196 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
Mike Stump1eb44332009-09-09 15:08:12 +00003197 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object
3198 // type. Note that Functions are not objects, and that (in C99 parlance)
Douglas Gregore7450f52009-03-24 19:52:54 +00003199 // incomplete types are not object types.
3200 if (ResultType->isFunctionType()) {
3201 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type)
3202 << ResultType << BaseExpr->getSourceRange();
3203 return ExprError();
3204 }
Mike Stump1eb44332009-09-09 15:08:12 +00003205
Abramo Bagnara46358452010-09-13 06:50:07 +00003206 if (ResultType->isVoidType() && !getLangOptions().CPlusPlus) {
3207 // GNU extension: subscripting on pointer to void
Chandler Carruth66289692011-06-27 16:32:27 +00003208 Diag(LLoc, diag::ext_gnu_subscript_void_type)
3209 << BaseExpr->getSourceRange();
John McCall09431682010-11-18 19:01:18 +00003210
3211 // C forbids expressions of unqualified void type from being l-values.
3212 // See IsCForbiddenLValueType.
3213 if (!ResultType.hasQualifiers()) VK = VK_RValue;
Abramo Bagnara46358452010-09-13 06:50:07 +00003214 } else if (!ResultType->isDependentType() &&
Mike Stump1eb44332009-09-09 15:08:12 +00003215 RequireCompleteType(LLoc, ResultType,
Anders Carlssonb7906612009-08-26 23:45:07 +00003216 PDiag(diag::err_subscript_incomplete_type)
3217 << BaseExpr->getSourceRange()))
Douglas Gregore7450f52009-03-24 19:52:54 +00003218 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00003219
Chris Lattner1efaa952009-04-24 00:30:45 +00003220 // Diagnose bad cases where we step over interface counts.
John McCallc12c5bb2010-05-15 11:32:37 +00003221 if (ResultType->isObjCObjectType() && LangOpts.ObjCNonFragileABI) {
Chris Lattner1efaa952009-04-24 00:30:45 +00003222 Diag(LLoc, diag::err_subscript_nonfragile_interface)
3223 << ResultType << BaseExpr->getSourceRange();
3224 return ExprError();
3225 }
Mike Stump1eb44332009-09-09 15:08:12 +00003226
John McCall09431682010-11-18 19:01:18 +00003227 assert(VK == VK_RValue || LangOpts.CPlusPlus ||
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00003228 !ResultType.isCForbiddenLValueType());
John McCall09431682010-11-18 19:01:18 +00003229
Mike Stumpeed9cac2009-02-19 03:04:26 +00003230 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
John McCallf89e55a2010-11-18 06:31:45 +00003231 ResultType, VK, OK, RLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00003232}
3233
John McCall60d7b3a2010-08-24 06:29:42 +00003234ExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc,
Nico Weber08e41a62010-11-29 18:19:25 +00003235 FunctionDecl *FD,
3236 ParmVarDecl *Param) {
Anders Carlsson56c5e332009-08-25 03:49:14 +00003237 if (Param->hasUnparsedDefaultArg()) {
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003238 Diag(CallLoc,
Nico Weber15d5c832010-11-30 04:44:33 +00003239 diag::err_use_of_default_argument_to_function_declared_later) <<
Anders Carlsson56c5e332009-08-25 03:49:14 +00003240 FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName();
Mike Stump1eb44332009-09-09 15:08:12 +00003241 Diag(UnparsedDefaultArgLocs[Param],
Nico Weber15d5c832010-11-30 04:44:33 +00003242 diag::note_default_argument_declared_here);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003243 return ExprError();
3244 }
3245
3246 if (Param->hasUninstantiatedDefaultArg()) {
3247 Expr *UninstExpr = Param->getUninstantiatedDefaultArg();
Anders Carlsson56c5e332009-08-25 03:49:14 +00003248
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003249 // Instantiate the expression.
3250 MultiLevelTemplateArgumentList ArgList
3251 = getTemplateInstantiationArgs(FD, 0, /*RelativeToPrimary=*/true);
Anders Carlsson25cae7f2009-09-05 05:14:19 +00003252
Nico Weber08e41a62010-11-29 18:19:25 +00003253 std::pair<const TemplateArgument *, unsigned> Innermost
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003254 = ArgList.getInnermost();
3255 InstantiatingTemplate Inst(*this, CallLoc, Param, Innermost.first,
3256 Innermost.second);
Anders Carlsson56c5e332009-08-25 03:49:14 +00003257
Nico Weber08e41a62010-11-29 18:19:25 +00003258 ExprResult Result;
3259 {
3260 // C++ [dcl.fct.default]p5:
3261 // The names in the [default argument] expression are bound, and
3262 // the semantic constraints are checked, at the point where the
3263 // default argument expression appears.
Nico Weber15d5c832010-11-30 04:44:33 +00003264 ContextRAII SavedContext(*this, FD);
Nico Weber08e41a62010-11-29 18:19:25 +00003265 Result = SubstExpr(UninstExpr, ArgList);
3266 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003267 if (Result.isInvalid())
3268 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00003269
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003270 // Check the expression as an initializer for the parameter.
3271 InitializedEntity Entity
Fariborz Jahanian745da3a2010-09-24 17:30:16 +00003272 = InitializedEntity::InitializeParameter(Context, Param);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003273 InitializationKind Kind
3274 = InitializationKind::CreateCopy(Param->getLocation(),
3275 /*FIXME:EqualLoc*/UninstExpr->getSourceRange().getBegin());
3276 Expr *ResultE = Result.takeAs<Expr>();
Douglas Gregor65222e82009-12-23 18:19:08 +00003277
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003278 InitializationSequence InitSeq(*this, Entity, Kind, &ResultE, 1);
3279 Result = InitSeq.Perform(*this, Entity, Kind,
3280 MultiExprArg(*this, &ResultE, 1));
3281 if (Result.isInvalid())
3282 return ExprError();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003283
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003284 // Build the default argument expression.
3285 return Owned(CXXDefaultArgExpr::Create(Context, CallLoc, Param,
3286 Result.takeAs<Expr>()));
Anders Carlsson56c5e332009-08-25 03:49:14 +00003287 }
3288
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003289 // If the default expression creates temporaries, we need to
3290 // push them to the current stack of expression temporaries so they'll
3291 // be properly destroyed.
3292 // FIXME: We should really be rebuilding the default argument with new
3293 // bound temporaries; see the comment in PR5810.
John McCall80ee6e82011-11-10 05:35:25 +00003294 // We don't need to do that with block decls, though, because
3295 // blocks in default argument expression can never capture anything.
3296 if (isa<ExprWithCleanups>(Param->getInit())) {
3297 // Set the "needs cleanups" bit regardless of whether there are
3298 // any explicit objects.
John McCallf85e1932011-06-15 23:02:42 +00003299 ExprNeedsCleanups = true;
John McCall80ee6e82011-11-10 05:35:25 +00003300
3301 // Append all the objects to the cleanup list. Right now, this
3302 // should always be a no-op, because blocks in default argument
3303 // expressions should never be able to capture anything.
3304 assert(!cast<ExprWithCleanups>(Param->getInit())->getNumObjects() &&
3305 "default argument expression has capturing blocks?");
Douglas Gregor5833b0b2010-09-14 22:55:20 +00003306 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003307
3308 // We already type-checked the argument, so we know it works.
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00003309 // Just mark all of the declarations in this potentially-evaluated expression
3310 // as being "referenced".
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003311 MarkDeclarationsReferencedInExpr(Param->getDefaultArg());
Douglas Gregor036aed12009-12-23 23:03:06 +00003312 return Owned(CXXDefaultArgExpr::Create(Context, CallLoc, Param));
Anders Carlsson56c5e332009-08-25 03:49:14 +00003313}
3314
Douglas Gregor88a35142008-12-22 05:46:06 +00003315/// ConvertArgumentsForCall - Converts the arguments specified in
3316/// Args/NumArgs to the parameter types of the function FDecl with
3317/// function prototype Proto. Call is the call expression itself, and
3318/// Fn is the function expression. For a C++ member function, this
3319/// routine does not attempt to convert the object argument. Returns
3320/// true if the call is ill-formed.
Mike Stumpeed9cac2009-02-19 03:04:26 +00003321bool
3322Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
Douglas Gregor88a35142008-12-22 05:46:06 +00003323 FunctionDecl *FDecl,
Douglas Gregor72564e72009-02-26 23:50:07 +00003324 const FunctionProtoType *Proto,
Douglas Gregor88a35142008-12-22 05:46:06 +00003325 Expr **Args, unsigned NumArgs,
Peter Collingbourne1f240762011-10-02 23:49:29 +00003326 SourceLocation RParenLoc,
3327 bool IsExecConfig) {
John McCall8e10f3b2011-02-26 05:39:39 +00003328 // Bail out early if calling a builtin with custom typechecking.
3329 // We don't need to do this in the
3330 if (FDecl)
3331 if (unsigned ID = FDecl->getBuiltinID())
3332 if (Context.BuiltinInfo.hasCustomTypechecking(ID))
3333 return false;
3334
Mike Stumpeed9cac2009-02-19 03:04:26 +00003335 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by
Douglas Gregor88a35142008-12-22 05:46:06 +00003336 // assignment, to the types of the corresponding parameter, ...
3337 unsigned NumArgsInProto = Proto->getNumArgs();
Douglas Gregor3fd56d72009-01-23 21:30:56 +00003338 bool Invalid = false;
Peter Collingbourneaf15b4d2011-10-02 23:49:20 +00003339 unsigned MinArgs = FDecl ? FDecl->getMinRequiredArguments() : NumArgsInProto;
Peter Collingbourne1f240762011-10-02 23:49:29 +00003340 unsigned FnKind = Fn->getType()->isBlockPointerType()
3341 ? 1 /* block */
3342 : (IsExecConfig ? 3 /* kernel function (exec config) */
3343 : 0 /* function */);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003344
Douglas Gregor88a35142008-12-22 05:46:06 +00003345 // If too few arguments are available (and we don't have default
3346 // arguments for the remaining parameters), don't make the call.
3347 if (NumArgs < NumArgsInProto) {
Peter Collingbourneaf15b4d2011-10-02 23:49:20 +00003348 if (NumArgs < MinArgs) {
3349 Diag(RParenLoc, MinArgs == NumArgsInProto
3350 ? diag::err_typecheck_call_too_few_args
3351 : diag::err_typecheck_call_too_few_args_at_least)
Peter Collingbourne1f240762011-10-02 23:49:29 +00003352 << FnKind
Peter Collingbourneaf15b4d2011-10-02 23:49:20 +00003353 << MinArgs << NumArgs << Fn->getSourceRange();
Peter Collingbourne9aab1482011-07-29 00:24:42 +00003354
3355 // Emit the location of the prototype.
Peter Collingbourne1f240762011-10-02 23:49:29 +00003356 if (FDecl && !FDecl->getBuiltinID() && !IsExecConfig)
Peter Collingbourne9aab1482011-07-29 00:24:42 +00003357 Diag(FDecl->getLocStart(), diag::note_callee_decl)
3358 << FDecl;
3359
3360 return true;
3361 }
Ted Kremenek8189cde2009-02-07 01:47:29 +00003362 Call->setNumArgs(Context, NumArgsInProto);
Douglas Gregor88a35142008-12-22 05:46:06 +00003363 }
3364
3365 // If too many are passed and not variadic, error on the extras and drop
3366 // them.
3367 if (NumArgs > NumArgsInProto) {
3368 if (!Proto->isVariadic()) {
3369 Diag(Args[NumArgsInProto]->getLocStart(),
Peter Collingbourneaf15b4d2011-10-02 23:49:20 +00003370 MinArgs == NumArgsInProto
3371 ? diag::err_typecheck_call_too_many_args
3372 : diag::err_typecheck_call_too_many_args_at_most)
Peter Collingbourne1f240762011-10-02 23:49:29 +00003373 << FnKind
Eric Christopherccfa9632010-04-16 04:56:46 +00003374 << NumArgsInProto << NumArgs << Fn->getSourceRange()
Douglas Gregor88a35142008-12-22 05:46:06 +00003375 << SourceRange(Args[NumArgsInProto]->getLocStart(),
3376 Args[NumArgs-1]->getLocEnd());
Ted Kremenek5862f0e2011-04-04 17:22:27 +00003377
3378 // Emit the location of the prototype.
Peter Collingbourne1f240762011-10-02 23:49:29 +00003379 if (FDecl && !FDecl->getBuiltinID() && !IsExecConfig)
Peter Collingbourne9aab1482011-07-29 00:24:42 +00003380 Diag(FDecl->getLocStart(), diag::note_callee_decl)
3381 << FDecl;
Ted Kremenek5862f0e2011-04-04 17:22:27 +00003382
Douglas Gregor88a35142008-12-22 05:46:06 +00003383 // This deletes the extra arguments.
Ted Kremenek8189cde2009-02-07 01:47:29 +00003384 Call->setNumArgs(Context, NumArgsInProto);
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003385 return true;
Douglas Gregor88a35142008-12-22 05:46:06 +00003386 }
Douglas Gregor88a35142008-12-22 05:46:06 +00003387 }
Chris Lattner5f9e2722011-07-23 10:55:15 +00003388 SmallVector<Expr *, 8> AllArgs;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003389 VariadicCallType CallType =
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00003390 Proto->isVariadic() ? VariadicFunction : VariadicDoesNotApply;
3391 if (Fn->getType()->isBlockPointerType())
3392 CallType = VariadicBlock; // Block
3393 else if (isa<MemberExpr>(Fn))
3394 CallType = VariadicMethod;
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003395 Invalid = GatherArgumentsForCall(Call->getSourceRange().getBegin(), FDecl,
Fariborz Jahanian2fe168f2009-11-24 21:37:28 +00003396 Proto, 0, Args, NumArgs, AllArgs, CallType);
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003397 if (Invalid)
3398 return true;
3399 unsigned TotalNumArgs = AllArgs.size();
3400 for (unsigned i = 0; i < TotalNumArgs; ++i)
3401 Call->setArg(i, AllArgs[i]);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003402
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003403 return false;
3404}
Mike Stumpeed9cac2009-02-19 03:04:26 +00003405
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003406bool Sema::GatherArgumentsForCall(SourceLocation CallLoc,
3407 FunctionDecl *FDecl,
3408 const FunctionProtoType *Proto,
3409 unsigned FirstProtoArg,
3410 Expr **Args, unsigned NumArgs,
Chris Lattner5f9e2722011-07-23 10:55:15 +00003411 SmallVector<Expr *, 8> &AllArgs,
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00003412 VariadicCallType CallType) {
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003413 unsigned NumArgsInProto = Proto->getNumArgs();
3414 unsigned NumArgsToCheck = NumArgs;
3415 bool Invalid = false;
3416 if (NumArgs != NumArgsInProto)
3417 // Use default arguments for missing arguments
3418 NumArgsToCheck = NumArgsInProto;
3419 unsigned ArgIx = 0;
Douglas Gregor88a35142008-12-22 05:46:06 +00003420 // Continue to check argument types (even if we have too few/many args).
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003421 for (unsigned i = FirstProtoArg; i != NumArgsToCheck; i++) {
Douglas Gregor88a35142008-12-22 05:46:06 +00003422 QualType ProtoArgType = Proto->getArgType(i);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003423
Douglas Gregor88a35142008-12-22 05:46:06 +00003424 Expr *Arg;
Peter Collingbourne013e5ce2011-10-19 00:16:45 +00003425 ParmVarDecl *Param;
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003426 if (ArgIx < NumArgs) {
3427 Arg = Args[ArgIx++];
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003428
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00003429 if (RequireCompleteType(Arg->getSourceRange().getBegin(),
3430 ProtoArgType,
Anders Carlssonb7906612009-08-26 23:45:07 +00003431 PDiag(diag::err_call_incomplete_argument)
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003432 << Arg->getSourceRange()))
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00003433 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003434
Douglas Gregora188ff22009-12-22 16:09:06 +00003435 // Pass the argument
Peter Collingbourne013e5ce2011-10-19 00:16:45 +00003436 Param = 0;
Douglas Gregora188ff22009-12-22 16:09:06 +00003437 if (FDecl && i < FDecl->getNumParams())
3438 Param = FDecl->getParamDecl(i);
Douglas Gregoraa037312009-12-22 07:24:36 +00003439
John McCall5acb0c92011-10-17 18:40:02 +00003440 // Strip the unbridged-cast placeholder expression off, if applicable.
3441 if (Arg->getType() == Context.ARCUnbridgedCastTy &&
3442 FDecl && FDecl->hasAttr<CFAuditedTransferAttr>() &&
3443 (!Param || !Param->hasAttr<CFConsumedAttr>()))
3444 Arg = stripARCUnbridgedCast(Arg);
3445
Douglas Gregora188ff22009-12-22 16:09:06 +00003446 InitializedEntity Entity =
Fariborz Jahanian745da3a2010-09-24 17:30:16 +00003447 Param? InitializedEntity::InitializeParameter(Context, Param)
John McCallf85e1932011-06-15 23:02:42 +00003448 : InitializedEntity::InitializeParameter(Context, ProtoArgType,
3449 Proto->isArgConsumed(i));
John McCall60d7b3a2010-08-24 06:29:42 +00003450 ExprResult ArgE = PerformCopyInitialization(Entity,
John McCallf6a16482010-12-04 03:47:34 +00003451 SourceLocation(),
3452 Owned(Arg));
Douglas Gregora188ff22009-12-22 16:09:06 +00003453 if (ArgE.isInvalid())
3454 return true;
3455
3456 Arg = ArgE.takeAs<Expr>();
Anders Carlsson5e300d12009-06-12 16:51:40 +00003457 } else {
Peter Collingbourne013e5ce2011-10-19 00:16:45 +00003458 Param = FDecl->getParamDecl(i);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003459
John McCall60d7b3a2010-08-24 06:29:42 +00003460 ExprResult ArgExpr =
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003461 BuildCXXDefaultArgExpr(CallLoc, FDecl, Param);
Anders Carlsson56c5e332009-08-25 03:49:14 +00003462 if (ArgExpr.isInvalid())
3463 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003464
Anders Carlsson56c5e332009-08-25 03:49:14 +00003465 Arg = ArgExpr.takeAs<Expr>();
Anders Carlsson5e300d12009-06-12 16:51:40 +00003466 }
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00003467
3468 // Check for array bounds violations for each argument to the call. This
3469 // check only triggers warnings when the argument isn't a more complex Expr
3470 // with its own checking, such as a BinaryOperator.
3471 CheckArrayAccess(Arg);
3472
Peter Collingbourne013e5ce2011-10-19 00:16:45 +00003473 // Check for violations of C99 static array rules (C99 6.7.5.3p7).
3474 CheckStaticArrayArgument(CallLoc, Param, Arg);
3475
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003476 AllArgs.push_back(Arg);
Douglas Gregor88a35142008-12-22 05:46:06 +00003477 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003478
Douglas Gregor88a35142008-12-22 05:46:06 +00003479 // If this is a variadic call, handle args passed through "...".
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00003480 if (CallType != VariadicDoesNotApply) {
John McCall755d8492011-04-12 00:42:48 +00003481
3482 // Assume that extern "C" functions with variadic arguments that
3483 // return __unknown_anytype aren't *really* variadic.
3484 if (Proto->getResultType() == Context.UnknownAnyTy &&
3485 FDecl && FDecl->isExternC()) {
3486 for (unsigned i = ArgIx; i != NumArgs; ++i) {
3487 ExprResult arg;
3488 if (isa<ExplicitCastExpr>(Args[i]->IgnoreParens()))
3489 arg = DefaultFunctionArrayLvalueConversion(Args[i]);
3490 else
3491 arg = DefaultVariadicArgumentPromotion(Args[i], CallType, FDecl);
3492 Invalid |= arg.isInvalid();
3493 AllArgs.push_back(arg.take());
3494 }
3495
3496 // Otherwise do argument promotion, (C99 6.5.2.2p7).
3497 } else {
3498 for (unsigned i = ArgIx; i != NumArgs; ++i) {
Richard Trieu67e29332011-08-02 04:35:43 +00003499 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], CallType,
3500 FDecl);
John McCall755d8492011-04-12 00:42:48 +00003501 Invalid |= Arg.isInvalid();
3502 AllArgs.push_back(Arg.take());
3503 }
Douglas Gregor88a35142008-12-22 05:46:06 +00003504 }
Ted Kremenek615eb7c2011-09-26 23:36:13 +00003505
3506 // Check for array bounds violations.
3507 for (unsigned i = ArgIx; i != NumArgs; ++i)
3508 CheckArrayAccess(Args[i]);
Douglas Gregor88a35142008-12-22 05:46:06 +00003509 }
Douglas Gregor3fd56d72009-01-23 21:30:56 +00003510 return Invalid;
Douglas Gregor88a35142008-12-22 05:46:06 +00003511}
3512
Peter Collingbourne013e5ce2011-10-19 00:16:45 +00003513static void DiagnoseCalleeStaticArrayParam(Sema &S, ParmVarDecl *PVD) {
3514 TypeLoc TL = PVD->getTypeSourceInfo()->getTypeLoc();
3515 if (ArrayTypeLoc *ATL = dyn_cast<ArrayTypeLoc>(&TL))
3516 S.Diag(PVD->getLocation(), diag::note_callee_static_array)
3517 << ATL->getLocalSourceRange();
3518}
3519
3520/// CheckStaticArrayArgument - If the given argument corresponds to a static
3521/// array parameter, check that it is non-null, and that if it is formed by
3522/// array-to-pointer decay, the underlying array is sufficiently large.
3523///
3524/// C99 6.7.5.3p7: If the keyword static also appears within the [ and ] of the
3525/// array type derivation, then for each call to the function, the value of the
3526/// corresponding actual argument shall provide access to the first element of
3527/// an array with at least as many elements as specified by the size expression.
3528void
3529Sema::CheckStaticArrayArgument(SourceLocation CallLoc,
3530 ParmVarDecl *Param,
3531 const Expr *ArgExpr) {
3532 // Static array parameters are not supported in C++.
3533 if (!Param || getLangOptions().CPlusPlus)
3534 return;
3535
3536 QualType OrigTy = Param->getOriginalType();
3537
3538 const ArrayType *AT = Context.getAsArrayType(OrigTy);
3539 if (!AT || AT->getSizeModifier() != ArrayType::Static)
3540 return;
3541
3542 if (ArgExpr->isNullPointerConstant(Context,
3543 Expr::NPC_NeverValueDependent)) {
3544 Diag(CallLoc, diag::warn_null_arg) << ArgExpr->getSourceRange();
3545 DiagnoseCalleeStaticArrayParam(*this, Param);
3546 return;
3547 }
3548
3549 const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT);
3550 if (!CAT)
3551 return;
3552
3553 const ConstantArrayType *ArgCAT =
3554 Context.getAsConstantArrayType(ArgExpr->IgnoreParenImpCasts()->getType());
3555 if (!ArgCAT)
3556 return;
3557
3558 if (ArgCAT->getSize().ult(CAT->getSize())) {
3559 Diag(CallLoc, diag::warn_static_array_too_small)
3560 << ArgExpr->getSourceRange()
3561 << (unsigned) ArgCAT->getSize().getZExtValue()
3562 << (unsigned) CAT->getSize().getZExtValue();
3563 DiagnoseCalleeStaticArrayParam(*this, Param);
3564 }
3565}
3566
John McCall755d8492011-04-12 00:42:48 +00003567/// Given a function expression of unknown-any type, try to rebuild it
3568/// to have a function type.
3569static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *fn);
3570
Steve Narofff69936d2007-09-16 03:34:24 +00003571/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
Reid Spencer5f016e22007-07-11 17:01:13 +00003572/// This provides the location of the left/right parens and a list of comma
3573/// locations.
John McCall60d7b3a2010-08-24 06:29:42 +00003574ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003575Sema::ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00003576 MultiExprArg ArgExprs, SourceLocation RParenLoc,
Peter Collingbourne1f240762011-10-02 23:49:29 +00003577 Expr *ExecConfig, bool IsExecConfig) {
Richard Trieuccd891a2011-09-09 01:45:06 +00003578 unsigned NumArgs = ArgExprs.size();
Nate Begeman2ef13e52009-08-10 23:49:36 +00003579
3580 // Since this might be a postfix expression, get rid of ParenListExprs.
John McCall60d7b3a2010-08-24 06:29:42 +00003581 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Fn);
John McCall9ae2f072010-08-23 23:25:46 +00003582 if (Result.isInvalid()) return ExprError();
3583 Fn = Result.take();
Mike Stump1eb44332009-09-09 15:08:12 +00003584
Richard Trieuccd891a2011-09-09 01:45:06 +00003585 Expr **Args = ArgExprs.release();
Mike Stump1eb44332009-09-09 15:08:12 +00003586
Douglas Gregor88a35142008-12-22 05:46:06 +00003587 if (getLangOptions().CPlusPlus) {
Douglas Gregora71d8192009-09-04 17:36:40 +00003588 // If this is a pseudo-destructor expression, build the call immediately.
3589 if (isa<CXXPseudoDestructorExpr>(Fn)) {
3590 if (NumArgs > 0) {
3591 // Pseudo-destructor calls should not have any arguments.
3592 Diag(Fn->getLocStart(), diag::err_pseudo_dtor_call_with_args)
Douglas Gregor849b2432010-03-31 17:46:05 +00003593 << FixItHint::CreateRemoval(
Douglas Gregora71d8192009-09-04 17:36:40 +00003594 SourceRange(Args[0]->getLocStart(),
3595 Args[NumArgs-1]->getLocEnd()));
Mike Stump1eb44332009-09-09 15:08:12 +00003596
Douglas Gregora71d8192009-09-04 17:36:40 +00003597 NumArgs = 0;
3598 }
Mike Stump1eb44332009-09-09 15:08:12 +00003599
Douglas Gregora71d8192009-09-04 17:36:40 +00003600 return Owned(new (Context) CallExpr(Context, Fn, 0, 0, Context.VoidTy,
John McCallf89e55a2010-11-18 06:31:45 +00003601 VK_RValue, RParenLoc));
Douglas Gregora71d8192009-09-04 17:36:40 +00003602 }
Mike Stump1eb44332009-09-09 15:08:12 +00003603
Douglas Gregor17330012009-02-04 15:01:18 +00003604 // Determine whether this is a dependent call inside a C++ template,
Mike Stumpeed9cac2009-02-19 03:04:26 +00003605 // in which case we won't do any semantic analysis now.
Mike Stump390b4cc2009-05-16 07:39:55 +00003606 // FIXME: Will need to cache the results of name lookup (including ADL) in
3607 // Fn.
Douglas Gregor17330012009-02-04 15:01:18 +00003608 bool Dependent = false;
3609 if (Fn->isTypeDependent())
3610 Dependent = true;
3611 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs))
3612 Dependent = true;
3613
Peter Collingbournee08ce652011-02-09 21:07:24 +00003614 if (Dependent) {
3615 if (ExecConfig) {
3616 return Owned(new (Context) CUDAKernelCallExpr(
3617 Context, Fn, cast<CallExpr>(ExecConfig), Args, NumArgs,
3618 Context.DependentTy, VK_RValue, RParenLoc));
3619 } else {
3620 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs,
3621 Context.DependentTy, VK_RValue,
3622 RParenLoc));
3623 }
3624 }
Douglas Gregor17330012009-02-04 15:01:18 +00003625
3626 // Determine whether this is a call to an object (C++ [over.call.object]).
3627 if (Fn->getType()->isRecordType())
3628 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00003629 RParenLoc));
Douglas Gregor17330012009-02-04 15:01:18 +00003630
John McCall755d8492011-04-12 00:42:48 +00003631 if (Fn->getType() == Context.UnknownAnyTy) {
3632 ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
3633 if (result.isInvalid()) return ExprError();
3634 Fn = result.take();
3635 }
3636
John McCall864c0412011-04-26 20:42:42 +00003637 if (Fn->getType() == Context.BoundMemberTy) {
John McCallaa81e162009-12-01 22:10:20 +00003638 return BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00003639 RParenLoc);
John McCall129e2df2009-11-30 22:42:35 +00003640 }
John McCall864c0412011-04-26 20:42:42 +00003641 }
John McCall129e2df2009-11-30 22:42:35 +00003642
John McCall864c0412011-04-26 20:42:42 +00003643 // Check for overloaded calls. This can happen even in C due to extensions.
3644 if (Fn->getType() == Context.OverloadTy) {
3645 OverloadExpr::FindResult find = OverloadExpr::find(Fn);
3646
Douglas Gregoree697e62011-10-13 18:10:35 +00003647 // We aren't supposed to apply this logic for if there's an '&' involved.
Douglas Gregor64a371f2011-10-13 18:26:27 +00003648 if (!find.HasFormOfMemberPointer) {
John McCall864c0412011-04-26 20:42:42 +00003649 OverloadExpr *ovl = find.Expression;
3650 if (isa<UnresolvedLookupExpr>(ovl)) {
3651 UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(ovl);
3652 return BuildOverloadedCallExpr(S, Fn, ULE, LParenLoc, Args, NumArgs,
3653 RParenLoc, ExecConfig);
3654 } else {
John McCallaa81e162009-12-01 22:10:20 +00003655 return BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00003656 RParenLoc);
Anders Carlsson83ccfc32009-10-03 17:40:22 +00003657 }
3658 }
Douglas Gregor88a35142008-12-22 05:46:06 +00003659 }
3660
Douglas Gregorfa047642009-02-04 00:32:51 +00003661 // If we're directly calling a function, get the appropriate declaration.
Mike Stumpeed9cac2009-02-19 03:04:26 +00003662
Eli Friedmanefa42f72009-12-26 03:35:45 +00003663 Expr *NakedFn = Fn->IgnoreParens();
Douglas Gregoref9b1492010-11-09 20:03:54 +00003664
John McCall3b4294e2009-12-16 12:17:52 +00003665 NamedDecl *NDecl = 0;
Douglas Gregord8f0ade2010-10-25 20:48:33 +00003666 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(NakedFn))
3667 if (UnOp->getOpcode() == UO_AddrOf)
3668 NakedFn = UnOp->getSubExpr()->IgnoreParens();
3669
John McCall3b4294e2009-12-16 12:17:52 +00003670 if (isa<DeclRefExpr>(NakedFn))
3671 NDecl = cast<DeclRefExpr>(NakedFn)->getDecl();
John McCall864c0412011-04-26 20:42:42 +00003672 else if (isa<MemberExpr>(NakedFn))
3673 NDecl = cast<MemberExpr>(NakedFn)->getMemberDecl();
John McCall3b4294e2009-12-16 12:17:52 +00003674
Peter Collingbournee08ce652011-02-09 21:07:24 +00003675 return BuildResolvedCallExpr(Fn, NDecl, LParenLoc, Args, NumArgs, RParenLoc,
Peter Collingbourne1f240762011-10-02 23:49:29 +00003676 ExecConfig, IsExecConfig);
Peter Collingbournee08ce652011-02-09 21:07:24 +00003677}
3678
3679ExprResult
3680Sema::ActOnCUDAExecConfigExpr(Scope *S, SourceLocation LLLLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00003681 MultiExprArg ExecConfig, SourceLocation GGGLoc) {
Peter Collingbournee08ce652011-02-09 21:07:24 +00003682 FunctionDecl *ConfigDecl = Context.getcudaConfigureCallDecl();
3683 if (!ConfigDecl)
3684 return ExprError(Diag(LLLLoc, diag::err_undeclared_var_use)
3685 << "cudaConfigureCall");
3686 QualType ConfigQTy = ConfigDecl->getType();
3687
3688 DeclRefExpr *ConfigDR = new (Context) DeclRefExpr(
3689 ConfigDecl, ConfigQTy, VK_LValue, LLLLoc);
3690
Peter Collingbourne1f240762011-10-02 23:49:29 +00003691 return ActOnCallExpr(S, ConfigDR, LLLLoc, ExecConfig, GGGLoc, 0,
3692 /*IsExecConfig=*/true);
John McCallaa81e162009-12-01 22:10:20 +00003693}
3694
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003695/// ActOnAsTypeExpr - create a new asType (bitcast) from the arguments.
3696///
3697/// __builtin_astype( value, dst type )
3698///
Richard Trieuccd891a2011-09-09 01:45:06 +00003699ExprResult Sema::ActOnAsTypeExpr(Expr *E, ParsedType ParsedDestTy,
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003700 SourceLocation BuiltinLoc,
3701 SourceLocation RParenLoc) {
3702 ExprValueKind VK = VK_RValue;
3703 ExprObjectKind OK = OK_Ordinary;
Richard Trieuccd891a2011-09-09 01:45:06 +00003704 QualType DstTy = GetTypeFromParser(ParsedDestTy);
3705 QualType SrcTy = E->getType();
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003706 if (Context.getTypeSize(DstTy) != Context.getTypeSize(SrcTy))
3707 return ExprError(Diag(BuiltinLoc,
3708 diag::err_invalid_astype_of_different_size)
Peter Collingbourneaf9cddf2011-06-08 15:15:17 +00003709 << DstTy
3710 << SrcTy
Richard Trieuccd891a2011-09-09 01:45:06 +00003711 << E->getSourceRange());
3712 return Owned(new (Context) AsTypeExpr(E, DstTy, VK, OK, BuiltinLoc,
Richard Trieu67e29332011-08-02 04:35:43 +00003713 RParenLoc));
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003714}
3715
John McCall3b4294e2009-12-16 12:17:52 +00003716/// BuildResolvedCallExpr - Build a call to a resolved expression,
3717/// i.e. an expression not of \p OverloadTy. The expression should
John McCallaa81e162009-12-01 22:10:20 +00003718/// unary-convert to an expression of function-pointer or
3719/// block-pointer type.
3720///
3721/// \param NDecl the declaration being called, if available
John McCall60d7b3a2010-08-24 06:29:42 +00003722ExprResult
John McCallaa81e162009-12-01 22:10:20 +00003723Sema::BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
3724 SourceLocation LParenLoc,
3725 Expr **Args, unsigned NumArgs,
Peter Collingbournee08ce652011-02-09 21:07:24 +00003726 SourceLocation RParenLoc,
Peter Collingbourne1f240762011-10-02 23:49:29 +00003727 Expr *Config, bool IsExecConfig) {
John McCallaa81e162009-12-01 22:10:20 +00003728 FunctionDecl *FDecl = dyn_cast_or_null<FunctionDecl>(NDecl);
3729
Chris Lattner04421082008-04-08 04:40:51 +00003730 // Promote the function operand.
John Wiegley429bb272011-04-08 18:41:53 +00003731 ExprResult Result = UsualUnaryConversions(Fn);
3732 if (Result.isInvalid())
3733 return ExprError();
3734 Fn = Result.take();
Chris Lattner04421082008-04-08 04:40:51 +00003735
Chris Lattner925e60d2007-12-28 05:29:59 +00003736 // Make the call expr early, before semantic checks. This guarantees cleanup
3737 // of arguments and function on error.
Peter Collingbournee08ce652011-02-09 21:07:24 +00003738 CallExpr *TheCall;
3739 if (Config) {
3740 TheCall = new (Context) CUDAKernelCallExpr(Context, Fn,
3741 cast<CallExpr>(Config),
3742 Args, NumArgs,
3743 Context.BoolTy,
3744 VK_RValue,
3745 RParenLoc);
3746 } else {
3747 TheCall = new (Context) CallExpr(Context, Fn,
3748 Args, NumArgs,
3749 Context.BoolTy,
3750 VK_RValue,
3751 RParenLoc);
3752 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00003753
John McCall8e10f3b2011-02-26 05:39:39 +00003754 unsigned BuiltinID = (FDecl ? FDecl->getBuiltinID() : 0);
3755
3756 // Bail out early if calling a builtin with custom typechecking.
3757 if (BuiltinID && Context.BuiltinInfo.hasCustomTypechecking(BuiltinID))
3758 return CheckBuiltinFunctionCall(BuiltinID, TheCall);
3759
John McCall1de4d4e2011-04-07 08:22:57 +00003760 retry:
Steve Naroffdd972f22008-09-05 22:11:13 +00003761 const FunctionType *FuncT;
John McCall8e10f3b2011-02-26 05:39:39 +00003762 if (const PointerType *PT = Fn->getType()->getAs<PointerType>()) {
Steve Naroffdd972f22008-09-05 22:11:13 +00003763 // C99 6.5.2.2p1 - "The expression that denotes the called function shall
3764 // have type pointer to function".
John McCall183700f2009-09-21 23:43:11 +00003765 FuncT = PT->getPointeeType()->getAs<FunctionType>();
John McCall8e10f3b2011-02-26 05:39:39 +00003766 if (FuncT == 0)
3767 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
3768 << Fn->getType() << Fn->getSourceRange());
3769 } else if (const BlockPointerType *BPT =
3770 Fn->getType()->getAs<BlockPointerType>()) {
3771 FuncT = BPT->getPointeeType()->castAs<FunctionType>();
3772 } else {
John McCall1de4d4e2011-04-07 08:22:57 +00003773 // Handle calls to expressions of unknown-any type.
3774 if (Fn->getType() == Context.UnknownAnyTy) {
John McCall755d8492011-04-12 00:42:48 +00003775 ExprResult rewrite = rebuildUnknownAnyFunction(*this, Fn);
John McCall1de4d4e2011-04-07 08:22:57 +00003776 if (rewrite.isInvalid()) return ExprError();
3777 Fn = rewrite.take();
John McCalla5fc4722011-04-09 22:50:59 +00003778 TheCall->setCallee(Fn);
John McCall1de4d4e2011-04-07 08:22:57 +00003779 goto retry;
3780 }
3781
Sebastian Redl0eb23302009-01-19 00:08:26 +00003782 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
3783 << Fn->getType() << Fn->getSourceRange());
John McCall8e10f3b2011-02-26 05:39:39 +00003784 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00003785
Peter Collingbourne0423fc62011-02-23 01:53:29 +00003786 if (getLangOptions().CUDA) {
3787 if (Config) {
3788 // CUDA: Kernel calls must be to global functions
3789 if (FDecl && !FDecl->hasAttr<CUDAGlobalAttr>())
3790 return ExprError(Diag(LParenLoc,diag::err_kern_call_not_global_function)
3791 << FDecl->getName() << Fn->getSourceRange());
3792
3793 // CUDA: Kernel function must have 'void' return type
3794 if (!FuncT->getResultType()->isVoidType())
3795 return ExprError(Diag(LParenLoc, diag::err_kern_type_not_void_return)
3796 << Fn->getType() << Fn->getSourceRange());
Peter Collingbourne8591a7f2011-10-02 23:49:15 +00003797 } else {
3798 // CUDA: Calls to global functions must be configured
3799 if (FDecl && FDecl->hasAttr<CUDAGlobalAttr>())
3800 return ExprError(Diag(LParenLoc, diag::err_global_call_not_config)
3801 << FDecl->getName() << Fn->getSourceRange());
Peter Collingbourne0423fc62011-02-23 01:53:29 +00003802 }
3803 }
3804
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00003805 // Check for a valid return type
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003806 if (CheckCallReturnType(FuncT->getResultType(),
John McCall9ae2f072010-08-23 23:25:46 +00003807 Fn->getSourceRange().getBegin(), TheCall,
Anders Carlsson8c8d9192009-10-09 23:51:55 +00003808 FDecl))
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00003809 return ExprError();
3810
Chris Lattner925e60d2007-12-28 05:29:59 +00003811 // We know the result type of the call, set it.
Douglas Gregor5291c3c2010-07-13 08:18:22 +00003812 TheCall->setType(FuncT->getCallResultType(Context));
John McCallf89e55a2010-11-18 06:31:45 +00003813 TheCall->setValueKind(Expr::getValueKindForType(FuncT->getResultType()));
Sebastian Redl0eb23302009-01-19 00:08:26 +00003814
Douglas Gregor72564e72009-02-26 23:50:07 +00003815 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) {
John McCall9ae2f072010-08-23 23:25:46 +00003816 if (ConvertArgumentsForCall(TheCall, Fn, FDecl, Proto, Args, NumArgs,
Peter Collingbourne1f240762011-10-02 23:49:29 +00003817 RParenLoc, IsExecConfig))
Sebastian Redl0eb23302009-01-19 00:08:26 +00003818 return ExprError();
Chris Lattner925e60d2007-12-28 05:29:59 +00003819 } else {
Douglas Gregor72564e72009-02-26 23:50:07 +00003820 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!");
Sebastian Redl0eb23302009-01-19 00:08:26 +00003821
Douglas Gregor74734d52009-04-02 15:37:10 +00003822 if (FDecl) {
3823 // Check if we have too few/too many template arguments, based
3824 // on our knowledge of the function definition.
3825 const FunctionDecl *Def = 0;
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00003826 if (FDecl->hasBody(Def) && NumArgs != Def->param_size()) {
Douglas Gregor46542412010-10-25 20:39:23 +00003827 const FunctionProtoType *Proto
3828 = Def->getType()->getAs<FunctionProtoType>();
3829 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size()))
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00003830 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments)
3831 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange();
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00003832 }
Douglas Gregor46542412010-10-25 20:39:23 +00003833
3834 // If the function we're calling isn't a function prototype, but we have
3835 // a function prototype from a prior declaratiom, use that prototype.
3836 if (!FDecl->hasPrototype())
3837 Proto = FDecl->getType()->getAs<FunctionProtoType>();
Douglas Gregor74734d52009-04-02 15:37:10 +00003838 }
3839
Steve Naroffb291ab62007-08-28 23:30:39 +00003840 // Promote the arguments (C99 6.5.2.2p6).
Chris Lattner925e60d2007-12-28 05:29:59 +00003841 for (unsigned i = 0; i != NumArgs; i++) {
3842 Expr *Arg = Args[i];
Douglas Gregor46542412010-10-25 20:39:23 +00003843
3844 if (Proto && i < Proto->getNumArgs()) {
Douglas Gregor46542412010-10-25 20:39:23 +00003845 InitializedEntity Entity
3846 = InitializedEntity::InitializeParameter(Context,
John McCallf85e1932011-06-15 23:02:42 +00003847 Proto->getArgType(i),
3848 Proto->isArgConsumed(i));
Douglas Gregor46542412010-10-25 20:39:23 +00003849 ExprResult ArgE = PerformCopyInitialization(Entity,
3850 SourceLocation(),
3851 Owned(Arg));
3852 if (ArgE.isInvalid())
3853 return true;
3854
3855 Arg = ArgE.takeAs<Expr>();
3856
3857 } else {
John Wiegley429bb272011-04-08 18:41:53 +00003858 ExprResult ArgE = DefaultArgumentPromotion(Arg);
3859
3860 if (ArgE.isInvalid())
3861 return true;
3862
3863 Arg = ArgE.takeAs<Expr>();
Douglas Gregor46542412010-10-25 20:39:23 +00003864 }
3865
Douglas Gregor0700bbf2010-10-26 05:45:40 +00003866 if (RequireCompleteType(Arg->getSourceRange().getBegin(),
3867 Arg->getType(),
3868 PDiag(diag::err_call_incomplete_argument)
3869 << Arg->getSourceRange()))
3870 return ExprError();
3871
Chris Lattner925e60d2007-12-28 05:29:59 +00003872 TheCall->setArg(i, Arg);
Steve Naroffb291ab62007-08-28 23:30:39 +00003873 }
Reid Spencer5f016e22007-07-11 17:01:13 +00003874 }
Chris Lattner925e60d2007-12-28 05:29:59 +00003875
Douglas Gregor88a35142008-12-22 05:46:06 +00003876 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
3877 if (!Method->isStatic())
Sebastian Redl0eb23302009-01-19 00:08:26 +00003878 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object)
3879 << Fn->getSourceRange());
Douglas Gregor88a35142008-12-22 05:46:06 +00003880
Fariborz Jahaniandaf04152009-05-15 20:33:25 +00003881 // Check for sentinels
3882 if (NDecl)
3883 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs);
Mike Stump1eb44332009-09-09 15:08:12 +00003884
Chris Lattner59907c42007-08-10 20:18:51 +00003885 // Do special checking on direct calls to functions.
Anders Carlssond406bf02009-08-16 01:56:34 +00003886 if (FDecl) {
John McCall9ae2f072010-08-23 23:25:46 +00003887 if (CheckFunctionCall(FDecl, TheCall))
Anders Carlssond406bf02009-08-16 01:56:34 +00003888 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00003889
John McCall8e10f3b2011-02-26 05:39:39 +00003890 if (BuiltinID)
Fariborz Jahanian67aba812010-11-30 17:35:24 +00003891 return CheckBuiltinFunctionCall(BuiltinID, TheCall);
Anders Carlssond406bf02009-08-16 01:56:34 +00003892 } else if (NDecl) {
John McCall9ae2f072010-08-23 23:25:46 +00003893 if (CheckBlockCall(NDecl, TheCall))
Anders Carlssond406bf02009-08-16 01:56:34 +00003894 return ExprError();
3895 }
Chris Lattner59907c42007-08-10 20:18:51 +00003896
John McCall9ae2f072010-08-23 23:25:46 +00003897 return MaybeBindToTemporary(TheCall);
Reid Spencer5f016e22007-07-11 17:01:13 +00003898}
3899
John McCall60d7b3a2010-08-24 06:29:42 +00003900ExprResult
John McCallb3d87482010-08-24 05:47:05 +00003901Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, ParsedType Ty,
John McCall9ae2f072010-08-23 23:25:46 +00003902 SourceLocation RParenLoc, Expr *InitExpr) {
Steve Narofff69936d2007-09-16 03:34:24 +00003903 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type");
Steve Naroffaff1edd2007-07-19 21:32:11 +00003904 // FIXME: put back this assert when initializers are worked out.
Steve Narofff69936d2007-09-16 03:34:24 +00003905 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression");
John McCall42f56b52010-01-18 19:35:47 +00003906
3907 TypeSourceInfo *TInfo;
3908 QualType literalType = GetTypeFromParser(Ty, &TInfo);
3909 if (!TInfo)
3910 TInfo = Context.getTrivialTypeSourceInfo(literalType);
3911
John McCall9ae2f072010-08-23 23:25:46 +00003912 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, InitExpr);
John McCall42f56b52010-01-18 19:35:47 +00003913}
3914
John McCall60d7b3a2010-08-24 06:29:42 +00003915ExprResult
John McCall42f56b52010-01-18 19:35:47 +00003916Sema::BuildCompoundLiteralExpr(SourceLocation LParenLoc, TypeSourceInfo *TInfo,
Richard Trieuccd891a2011-09-09 01:45:06 +00003917 SourceLocation RParenLoc, Expr *LiteralExpr) {
John McCall42f56b52010-01-18 19:35:47 +00003918 QualType literalType = TInfo->getType();
Anders Carlssond35c8322007-12-05 07:24:19 +00003919
Eli Friedman6223c222008-05-20 05:22:08 +00003920 if (literalType->isArrayType()) {
Argyrios Kyrtzidise6fe9a22010-11-08 19:14:19 +00003921 if (RequireCompleteType(LParenLoc, Context.getBaseElementType(literalType),
3922 PDiag(diag::err_illegal_decl_array_incomplete_type)
3923 << SourceRange(LParenLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00003924 LiteralExpr->getSourceRange().getEnd())))
Argyrios Kyrtzidise6fe9a22010-11-08 19:14:19 +00003925 return ExprError();
Chris Lattnerc63a1f22008-08-04 07:31:14 +00003926 if (literalType->isVariableArrayType())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003927 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init)
Richard Trieuccd891a2011-09-09 01:45:06 +00003928 << SourceRange(LParenLoc, LiteralExpr->getSourceRange().getEnd()));
Douglas Gregor690dc7f2009-05-21 23:48:18 +00003929 } else if (!literalType->isDependentType() &&
3930 RequireCompleteType(LParenLoc, literalType,
Anders Carlssonb7906612009-08-26 23:45:07 +00003931 PDiag(diag::err_typecheck_decl_incomplete_type)
Mike Stump1eb44332009-09-09 15:08:12 +00003932 << SourceRange(LParenLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00003933 LiteralExpr->getSourceRange().getEnd())))
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003934 return ExprError();
Eli Friedman6223c222008-05-20 05:22:08 +00003935
Douglas Gregor99a2e602009-12-16 01:38:02 +00003936 InitializedEntity Entity
Douglas Gregord6542d82009-12-22 15:35:07 +00003937 = InitializedEntity::InitializeTemporary(literalType);
Douglas Gregor99a2e602009-12-16 01:38:02 +00003938 InitializationKind Kind
John McCallf85e1932011-06-15 23:02:42 +00003939 = InitializationKind::CreateCStyleCast(LParenLoc,
3940 SourceRange(LParenLoc, RParenLoc));
Richard Trieuccd891a2011-09-09 01:45:06 +00003941 InitializationSequence InitSeq(*this, Entity, Kind, &LiteralExpr, 1);
John McCall60d7b3a2010-08-24 06:29:42 +00003942 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
Richard Trieuccd891a2011-09-09 01:45:06 +00003943 MultiExprArg(*this, &LiteralExpr, 1),
Eli Friedman08544622009-12-22 02:35:53 +00003944 &literalType);
3945 if (Result.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003946 return ExprError();
Richard Trieuccd891a2011-09-09 01:45:06 +00003947 LiteralExpr = Result.get();
Steve Naroffe9b12192008-01-14 18:19:28 +00003948
Chris Lattner371f2582008-12-04 23:50:19 +00003949 bool isFileScope = getCurFunctionOrMethodDecl() == 0;
Steve Naroffe9b12192008-01-14 18:19:28 +00003950 if (isFileScope) { // 6.5.2.5p3
Richard Trieuccd891a2011-09-09 01:45:06 +00003951 if (CheckForConstantInitializer(LiteralExpr, literalType))
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003952 return ExprError();
Steve Naroffd0091aa2008-01-10 22:15:12 +00003953 }
Eli Friedman08544622009-12-22 02:35:53 +00003954
John McCallf89e55a2010-11-18 06:31:45 +00003955 // In C, compound literals are l-values for some reason.
3956 ExprValueKind VK = getLangOptions().CPlusPlus ? VK_RValue : VK_LValue;
3957
Douglas Gregor751ec9b2011-06-17 04:59:12 +00003958 return MaybeBindToTemporary(
3959 new (Context) CompoundLiteralExpr(LParenLoc, TInfo, literalType,
Richard Trieuccd891a2011-09-09 01:45:06 +00003960 VK, LiteralExpr, isFileScope));
Steve Naroff4aa88f82007-07-19 01:06:55 +00003961}
3962
John McCall60d7b3a2010-08-24 06:29:42 +00003963ExprResult
Richard Trieuccd891a2011-09-09 01:45:06 +00003964Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg InitArgList,
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003965 SourceLocation RBraceLoc) {
Richard Trieuccd891a2011-09-09 01:45:06 +00003966 unsigned NumInit = InitArgList.size();
3967 Expr **InitList = InitArgList.release();
Anders Carlsson66b5a8a2007-08-31 04:56:16 +00003968
John McCall3c3b7f92011-10-25 17:37:35 +00003969 // Immediately handle non-overload placeholders. Overloads can be
3970 // resolved contextually, but everything else here can't.
3971 for (unsigned I = 0; I != NumInit; ++I) {
3972 if (const BuiltinType *pty
3973 = InitList[I]->getType()->getAsPlaceholderType()) {
3974 if (pty->getKind() == BuiltinType::Overload) continue;
3975
3976 ExprResult result = CheckPlaceholderExpr(InitList[I]);
3977
3978 // Ignore failures; dropping the entire initializer list because
3979 // of one failure would be terrible for indexing/etc.
3980 if (result.isInvalid()) continue;
3981
3982 InitList[I] = result.take();
3983 }
3984 }
3985
Steve Naroff08d92e42007-09-15 18:49:24 +00003986 // Semantic analysis for initializers is done by ActOnDeclarator() and
Mike Stumpeed9cac2009-02-19 03:04:26 +00003987 // CheckInitializer() - it requires knowledge of the object being intialized.
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003988
Ted Kremenek709210f2010-04-13 23:39:13 +00003989 InitListExpr *E = new (Context) InitListExpr(Context, LBraceLoc, InitList,
3990 NumInit, RBraceLoc);
Chris Lattnerf0467b32008-04-02 04:24:33 +00003991 E->setType(Context.VoidTy); // FIXME: just a place holder for now.
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003992 return Owned(E);
Steve Naroff4aa88f82007-07-19 01:06:55 +00003993}
3994
John McCalldc05b112011-09-10 01:16:55 +00003995/// Do an explicit extend of the given block pointer if we're in ARC.
3996static void maybeExtendBlockObject(Sema &S, ExprResult &E) {
3997 assert(E.get()->getType()->isBlockPointerType());
3998 assert(E.get()->isRValue());
3999
4000 // Only do this in an r-value context.
4001 if (!S.getLangOptions().ObjCAutoRefCount) return;
4002
4003 E = ImplicitCastExpr::Create(S.Context, E.get()->getType(),
John McCall33e56f32011-09-10 06:18:15 +00004004 CK_ARCExtendBlockObject, E.get(),
John McCalldc05b112011-09-10 01:16:55 +00004005 /*base path*/ 0, VK_RValue);
4006 S.ExprNeedsCleanups = true;
4007}
4008
4009/// Prepare a conversion of the given expression to an ObjC object
4010/// pointer type.
4011CastKind Sema::PrepareCastToObjCObjectPointer(ExprResult &E) {
4012 QualType type = E.get()->getType();
4013 if (type->isObjCObjectPointerType()) {
4014 return CK_BitCast;
4015 } else if (type->isBlockPointerType()) {
4016 maybeExtendBlockObject(*this, E);
4017 return CK_BlockPointerToObjCPointerCast;
4018 } else {
4019 assert(type->isPointerType());
4020 return CK_CPointerToObjCPointerCast;
4021 }
4022}
4023
John McCallf3ea8cf2010-11-14 08:17:51 +00004024/// Prepares for a scalar cast, performing all the necessary stages
4025/// except the final cast and returning the kind required.
John McCalla180f042011-10-06 23:25:11 +00004026CastKind Sema::PrepareScalarCast(ExprResult &Src, QualType DestTy) {
John McCallf3ea8cf2010-11-14 08:17:51 +00004027 // Both Src and Dest are scalar types, i.e. arithmetic or pointer.
4028 // Also, callers should have filtered out the invalid cases with
4029 // pointers. Everything else should be possible.
4030
John Wiegley429bb272011-04-08 18:41:53 +00004031 QualType SrcTy = Src.get()->getType();
John McCalla180f042011-10-06 23:25:11 +00004032 if (Context.hasSameUnqualifiedType(SrcTy, DestTy))
John McCall2de56d12010-08-25 11:45:40 +00004033 return CK_NoOp;
Anders Carlsson82debc72009-10-18 18:12:03 +00004034
John McCall1d9b3b22011-09-09 05:25:32 +00004035 switch (Type::ScalarTypeKind SrcKind = SrcTy->getScalarTypeKind()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00004036 case Type::STK_MemberPointer:
4037 llvm_unreachable("member pointer type in C");
Abramo Bagnarabb03f5d2011-01-04 09:50:03 +00004038
John McCall1d9b3b22011-09-09 05:25:32 +00004039 case Type::STK_CPointer:
4040 case Type::STK_BlockPointer:
4041 case Type::STK_ObjCObjectPointer:
John McCalldaa8e4e2010-11-15 09:13:47 +00004042 switch (DestTy->getScalarTypeKind()) {
John McCall1d9b3b22011-09-09 05:25:32 +00004043 case Type::STK_CPointer:
4044 return CK_BitCast;
4045 case Type::STK_BlockPointer:
4046 return (SrcKind == Type::STK_BlockPointer
4047 ? CK_BitCast : CK_AnyPointerToBlockPointerCast);
4048 case Type::STK_ObjCObjectPointer:
4049 if (SrcKind == Type::STK_ObjCObjectPointer)
4050 return CK_BitCast;
4051 else if (SrcKind == Type::STK_CPointer)
4052 return CK_CPointerToObjCPointerCast;
John McCalldc05b112011-09-10 01:16:55 +00004053 else {
John McCalla180f042011-10-06 23:25:11 +00004054 maybeExtendBlockObject(*this, Src);
John McCall1d9b3b22011-09-09 05:25:32 +00004055 return CK_BlockPointerToObjCPointerCast;
John McCalldc05b112011-09-10 01:16:55 +00004056 }
John McCalldaa8e4e2010-11-15 09:13:47 +00004057 case Type::STK_Bool:
4058 return CK_PointerToBoolean;
4059 case Type::STK_Integral:
4060 return CK_PointerToIntegral;
4061 case Type::STK_Floating:
4062 case Type::STK_FloatingComplex:
4063 case Type::STK_IntegralComplex:
4064 case Type::STK_MemberPointer:
4065 llvm_unreachable("illegal cast from pointer");
4066 }
4067 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004068
John McCalldaa8e4e2010-11-15 09:13:47 +00004069 case Type::STK_Bool: // casting from bool is like casting from an integer
4070 case Type::STK_Integral:
4071 switch (DestTy->getScalarTypeKind()) {
John McCall1d9b3b22011-09-09 05:25:32 +00004072 case Type::STK_CPointer:
4073 case Type::STK_ObjCObjectPointer:
4074 case Type::STK_BlockPointer:
John McCalla180f042011-10-06 23:25:11 +00004075 if (Src.get()->isNullPointerConstant(Context,
Richard Trieu67e29332011-08-02 04:35:43 +00004076 Expr::NPC_ValueDependentIsNull))
John McCall404cd162010-11-13 01:35:44 +00004077 return CK_NullToPointer;
John McCall2de56d12010-08-25 11:45:40 +00004078 return CK_IntegralToPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00004079 case Type::STK_Bool:
4080 return CK_IntegralToBoolean;
4081 case Type::STK_Integral:
John McCallf3ea8cf2010-11-14 08:17:51 +00004082 return CK_IntegralCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00004083 case Type::STK_Floating:
John McCall2de56d12010-08-25 11:45:40 +00004084 return CK_IntegralToFloating;
John McCalldaa8e4e2010-11-15 09:13:47 +00004085 case Type::STK_IntegralComplex:
John McCalla180f042011-10-06 23:25:11 +00004086 Src = ImpCastExprToType(Src.take(),
4087 DestTy->castAs<ComplexType>()->getElementType(),
4088 CK_IntegralCast);
John McCallf3ea8cf2010-11-14 08:17:51 +00004089 return CK_IntegralRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00004090 case Type::STK_FloatingComplex:
John McCalla180f042011-10-06 23:25:11 +00004091 Src = ImpCastExprToType(Src.take(),
4092 DestTy->castAs<ComplexType>()->getElementType(),
4093 CK_IntegralToFloating);
John McCallf3ea8cf2010-11-14 08:17:51 +00004094 return CK_FloatingRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00004095 case Type::STK_MemberPointer:
4096 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00004097 }
4098 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004099
John McCalldaa8e4e2010-11-15 09:13:47 +00004100 case Type::STK_Floating:
4101 switch (DestTy->getScalarTypeKind()) {
4102 case Type::STK_Floating:
John McCall2de56d12010-08-25 11:45:40 +00004103 return CK_FloatingCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00004104 case Type::STK_Bool:
4105 return CK_FloatingToBoolean;
4106 case Type::STK_Integral:
John McCall2de56d12010-08-25 11:45:40 +00004107 return CK_FloatingToIntegral;
John McCalldaa8e4e2010-11-15 09:13:47 +00004108 case Type::STK_FloatingComplex:
John McCalla180f042011-10-06 23:25:11 +00004109 Src = ImpCastExprToType(Src.take(),
4110 DestTy->castAs<ComplexType>()->getElementType(),
4111 CK_FloatingCast);
John McCallf3ea8cf2010-11-14 08:17:51 +00004112 return CK_FloatingRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00004113 case Type::STK_IntegralComplex:
John McCalla180f042011-10-06 23:25:11 +00004114 Src = ImpCastExprToType(Src.take(),
4115 DestTy->castAs<ComplexType>()->getElementType(),
4116 CK_FloatingToIntegral);
John McCallf3ea8cf2010-11-14 08:17:51 +00004117 return CK_IntegralRealToComplex;
John McCall1d9b3b22011-09-09 05:25:32 +00004118 case Type::STK_CPointer:
4119 case Type::STK_ObjCObjectPointer:
4120 case Type::STK_BlockPointer:
John McCalldaa8e4e2010-11-15 09:13:47 +00004121 llvm_unreachable("valid float->pointer cast?");
4122 case Type::STK_MemberPointer:
4123 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00004124 }
4125 break;
4126
John McCalldaa8e4e2010-11-15 09:13:47 +00004127 case Type::STK_FloatingComplex:
4128 switch (DestTy->getScalarTypeKind()) {
4129 case Type::STK_FloatingComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004130 return CK_FloatingComplexCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00004131 case Type::STK_IntegralComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004132 return CK_FloatingComplexToIntegralComplex;
John McCall8786da72010-12-14 17:51:41 +00004133 case Type::STK_Floating: {
John McCalla180f042011-10-06 23:25:11 +00004134 QualType ET = SrcTy->castAs<ComplexType>()->getElementType();
4135 if (Context.hasSameType(ET, DestTy))
John McCall8786da72010-12-14 17:51:41 +00004136 return CK_FloatingComplexToReal;
John McCalla180f042011-10-06 23:25:11 +00004137 Src = ImpCastExprToType(Src.take(), ET, CK_FloatingComplexToReal);
John McCall8786da72010-12-14 17:51:41 +00004138 return CK_FloatingCast;
4139 }
John McCalldaa8e4e2010-11-15 09:13:47 +00004140 case Type::STK_Bool:
John McCallf3ea8cf2010-11-14 08:17:51 +00004141 return CK_FloatingComplexToBoolean;
John McCalldaa8e4e2010-11-15 09:13:47 +00004142 case Type::STK_Integral:
John McCalla180f042011-10-06 23:25:11 +00004143 Src = ImpCastExprToType(Src.take(),
4144 SrcTy->castAs<ComplexType>()->getElementType(),
4145 CK_FloatingComplexToReal);
John McCallf3ea8cf2010-11-14 08:17:51 +00004146 return CK_FloatingToIntegral;
John McCall1d9b3b22011-09-09 05:25:32 +00004147 case Type::STK_CPointer:
4148 case Type::STK_ObjCObjectPointer:
4149 case Type::STK_BlockPointer:
John McCalldaa8e4e2010-11-15 09:13:47 +00004150 llvm_unreachable("valid complex float->pointer cast?");
4151 case Type::STK_MemberPointer:
4152 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00004153 }
4154 break;
4155
John McCalldaa8e4e2010-11-15 09:13:47 +00004156 case Type::STK_IntegralComplex:
4157 switch (DestTy->getScalarTypeKind()) {
4158 case Type::STK_FloatingComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004159 return CK_IntegralComplexToFloatingComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00004160 case Type::STK_IntegralComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004161 return CK_IntegralComplexCast;
John McCall8786da72010-12-14 17:51:41 +00004162 case Type::STK_Integral: {
John McCalla180f042011-10-06 23:25:11 +00004163 QualType ET = SrcTy->castAs<ComplexType>()->getElementType();
4164 if (Context.hasSameType(ET, DestTy))
John McCall8786da72010-12-14 17:51:41 +00004165 return CK_IntegralComplexToReal;
John McCalla180f042011-10-06 23:25:11 +00004166 Src = ImpCastExprToType(Src.take(), ET, CK_IntegralComplexToReal);
John McCall8786da72010-12-14 17:51:41 +00004167 return CK_IntegralCast;
4168 }
John McCalldaa8e4e2010-11-15 09:13:47 +00004169 case Type::STK_Bool:
John McCallf3ea8cf2010-11-14 08:17:51 +00004170 return CK_IntegralComplexToBoolean;
John McCalldaa8e4e2010-11-15 09:13:47 +00004171 case Type::STK_Floating:
John McCalla180f042011-10-06 23:25:11 +00004172 Src = ImpCastExprToType(Src.take(),
4173 SrcTy->castAs<ComplexType>()->getElementType(),
4174 CK_IntegralComplexToReal);
John McCallf3ea8cf2010-11-14 08:17:51 +00004175 return CK_IntegralToFloating;
John McCall1d9b3b22011-09-09 05:25:32 +00004176 case Type::STK_CPointer:
4177 case Type::STK_ObjCObjectPointer:
4178 case Type::STK_BlockPointer:
John McCalldaa8e4e2010-11-15 09:13:47 +00004179 llvm_unreachable("valid complex int->pointer cast?");
4180 case Type::STK_MemberPointer:
4181 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00004182 }
4183 break;
Anders Carlsson82debc72009-10-18 18:12:03 +00004184 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004185
John McCallf3ea8cf2010-11-14 08:17:51 +00004186 llvm_unreachable("Unhandled scalar cast");
Anders Carlsson82debc72009-10-18 18:12:03 +00004187}
4188
Anders Carlssonc3516322009-10-16 02:48:28 +00004189bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty,
John McCall2de56d12010-08-25 11:45:40 +00004190 CastKind &Kind) {
Anders Carlssona64db8f2007-11-27 05:51:55 +00004191 assert(VectorTy->isVectorType() && "Not a vector type!");
Mike Stumpeed9cac2009-02-19 03:04:26 +00004192
Anders Carlssona64db8f2007-11-27 05:51:55 +00004193 if (Ty->isVectorType() || Ty->isIntegerType()) {
Chris Lattner98be4942008-03-05 18:54:05 +00004194 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty))
Anders Carlssona64db8f2007-11-27 05:51:55 +00004195 return Diag(R.getBegin(),
Mike Stumpeed9cac2009-02-19 03:04:26 +00004196 Ty->isVectorType() ?
Anders Carlssona64db8f2007-11-27 05:51:55 +00004197 diag::err_invalid_conversion_between_vectors :
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00004198 diag::err_invalid_conversion_between_vector_and_integer)
Chris Lattnerd1625842008-11-24 06:25:27 +00004199 << VectorTy << Ty << R;
Anders Carlssona64db8f2007-11-27 05:51:55 +00004200 } else
4201 return Diag(R.getBegin(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00004202 diag::err_invalid_conversion_between_vector_and_scalar)
Chris Lattnerd1625842008-11-24 06:25:27 +00004203 << VectorTy << Ty << R;
Mike Stumpeed9cac2009-02-19 03:04:26 +00004204
John McCall2de56d12010-08-25 11:45:40 +00004205 Kind = CK_BitCast;
Anders Carlssona64db8f2007-11-27 05:51:55 +00004206 return false;
4207}
4208
John Wiegley429bb272011-04-08 18:41:53 +00004209ExprResult Sema::CheckExtVectorCast(SourceRange R, QualType DestTy,
4210 Expr *CastExpr, CastKind &Kind) {
Nate Begeman58d29a42009-06-26 00:50:28 +00004211 assert(DestTy->isExtVectorType() && "Not an extended vector type!");
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004212
Anders Carlsson16a89042009-10-16 05:23:41 +00004213 QualType SrcTy = CastExpr->getType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004214
Nate Begeman9b10da62009-06-27 22:05:55 +00004215 // If SrcTy is a VectorType, the total size must match to explicitly cast to
4216 // an ExtVectorType.
Tobias Grosser9df05ea2011-09-22 13:03:14 +00004217 // In OpenCL, casts between vectors of different types are not allowed.
4218 // (See OpenCL 6.2).
Nate Begeman58d29a42009-06-26 00:50:28 +00004219 if (SrcTy->isVectorType()) {
Tobias Grosser9df05ea2011-09-22 13:03:14 +00004220 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)
4221 || (getLangOptions().OpenCL &&
4222 (DestTy.getCanonicalType() != SrcTy.getCanonicalType()))) {
John Wiegley429bb272011-04-08 18:41:53 +00004223 Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors)
Nate Begeman58d29a42009-06-26 00:50:28 +00004224 << DestTy << SrcTy << R;
John Wiegley429bb272011-04-08 18:41:53 +00004225 return ExprError();
4226 }
John McCall2de56d12010-08-25 11:45:40 +00004227 Kind = CK_BitCast;
John Wiegley429bb272011-04-08 18:41:53 +00004228 return Owned(CastExpr);
Nate Begeman58d29a42009-06-26 00:50:28 +00004229 }
4230
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00004231 // All non-pointer scalars can be cast to ExtVector type. The appropriate
Nate Begeman58d29a42009-06-26 00:50:28 +00004232 // conversion will take place first from scalar to elt type, and then
4233 // splat from elt type to vector.
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00004234 if (SrcTy->isPointerType())
4235 return Diag(R.getBegin(),
4236 diag::err_invalid_conversion_between_vector_and_scalar)
4237 << DestTy << SrcTy << R;
Eli Friedman73c39ab2009-10-20 08:27:19 +00004238
4239 QualType DestElemTy = DestTy->getAs<ExtVectorType>()->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +00004240 ExprResult CastExprRes = Owned(CastExpr);
John McCalla180f042011-10-06 23:25:11 +00004241 CastKind CK = PrepareScalarCast(CastExprRes, DestElemTy);
John Wiegley429bb272011-04-08 18:41:53 +00004242 if (CastExprRes.isInvalid())
4243 return ExprError();
4244 CastExpr = ImpCastExprToType(CastExprRes.take(), DestElemTy, CK).take();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004245
John McCall2de56d12010-08-25 11:45:40 +00004246 Kind = CK_VectorSplat;
John Wiegley429bb272011-04-08 18:41:53 +00004247 return Owned(CastExpr);
Nate Begeman58d29a42009-06-26 00:50:28 +00004248}
4249
John McCall60d7b3a2010-08-24 06:29:42 +00004250ExprResult
Argyrios Kyrtzidis0a851832011-07-01 22:22:59 +00004251Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc,
4252 Declarator &D, ParsedType &Ty,
Richard Trieuccd891a2011-09-09 01:45:06 +00004253 SourceLocation RParenLoc, Expr *CastExpr) {
4254 assert(!D.isInvalidType() && (CastExpr != 0) &&
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004255 "ActOnCastExpr(): missing type or expr");
Steve Naroff16beff82007-07-16 23:25:18 +00004256
Richard Trieuccd891a2011-09-09 01:45:06 +00004257 TypeSourceInfo *castTInfo = GetTypeForDeclaratorCast(D, CastExpr->getType());
Argyrios Kyrtzidis0a851832011-07-01 22:22:59 +00004258 if (D.isInvalidType())
4259 return ExprError();
4260
4261 if (getLangOptions().CPlusPlus) {
4262 // Check that there are no default arguments (C++ only).
4263 CheckExtraCXXDefaultArguments(D);
4264 }
4265
John McCalle82247a2011-10-01 05:17:03 +00004266 checkUnusedDeclAttributes(D);
4267
Argyrios Kyrtzidis0a851832011-07-01 22:22:59 +00004268 QualType castType = castTInfo->getType();
4269 Ty = CreateParsedType(castType, castTInfo);
Mike Stump1eb44332009-09-09 15:08:12 +00004270
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004271 bool isVectorLiteral = false;
4272
4273 // Check for an altivec or OpenCL literal,
4274 // i.e. all the elements are integer constants.
Richard Trieuccd891a2011-09-09 01:45:06 +00004275 ParenExpr *PE = dyn_cast<ParenExpr>(CastExpr);
4276 ParenListExpr *PLE = dyn_cast<ParenListExpr>(CastExpr);
Tobias Grosser37c31c22011-09-21 18:28:29 +00004277 if ((getLangOptions().AltiVec || getLangOptions().OpenCL)
4278 && castType->isVectorType() && (PE || PLE)) {
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004279 if (PLE && PLE->getNumExprs() == 0) {
4280 Diag(PLE->getExprLoc(), diag::err_altivec_empty_initializer);
4281 return ExprError();
4282 }
4283 if (PE || PLE->getNumExprs() == 1) {
4284 Expr *E = (PE ? PE->getSubExpr() : PLE->getExpr(0));
4285 if (!E->getType()->isVectorType())
4286 isVectorLiteral = true;
4287 }
4288 else
4289 isVectorLiteral = true;
4290 }
4291
4292 // If this is a vector initializer, '(' type ')' '(' init, ..., init ')'
4293 // then handle it as such.
4294 if (isVectorLiteral)
Richard Trieuccd891a2011-09-09 01:45:06 +00004295 return BuildVectorLiteral(LParenLoc, RParenLoc, CastExpr, castTInfo);
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004296
Nate Begeman2ef13e52009-08-10 23:49:36 +00004297 // If the Expr being casted is a ParenListExpr, handle it specially.
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004298 // This is not an AltiVec-style cast, so turn the ParenListExpr into a
4299 // sequence of BinOp comma operators.
Richard Trieuccd891a2011-09-09 01:45:06 +00004300 if (isa<ParenListExpr>(CastExpr)) {
4301 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, CastExpr);
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004302 if (Result.isInvalid()) return ExprError();
Richard Trieuccd891a2011-09-09 01:45:06 +00004303 CastExpr = Result.take();
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004304 }
John McCallb042fdf2010-01-15 18:56:44 +00004305
Richard Trieuccd891a2011-09-09 01:45:06 +00004306 return BuildCStyleCastExpr(LParenLoc, castTInfo, RParenLoc, CastExpr);
John McCallb042fdf2010-01-15 18:56:44 +00004307}
4308
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004309ExprResult Sema::BuildVectorLiteral(SourceLocation LParenLoc,
4310 SourceLocation RParenLoc, Expr *E,
4311 TypeSourceInfo *TInfo) {
4312 assert((isa<ParenListExpr>(E) || isa<ParenExpr>(E)) &&
4313 "Expected paren or paren list expression");
4314
4315 Expr **exprs;
4316 unsigned numExprs;
4317 Expr *subExpr;
4318 if (ParenListExpr *PE = dyn_cast<ParenListExpr>(E)) {
4319 exprs = PE->getExprs();
4320 numExprs = PE->getNumExprs();
4321 } else {
4322 subExpr = cast<ParenExpr>(E)->getSubExpr();
4323 exprs = &subExpr;
4324 numExprs = 1;
4325 }
4326
4327 QualType Ty = TInfo->getType();
4328 assert(Ty->isVectorType() && "Expected vector type");
4329
Chris Lattner5f9e2722011-07-23 10:55:15 +00004330 SmallVector<Expr *, 8> initExprs;
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004331 const VectorType *VTy = Ty->getAs<VectorType>();
4332 unsigned numElems = Ty->getAs<VectorType>()->getNumElements();
4333
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004334 // '(...)' form of vector initialization in AltiVec: the number of
4335 // initializers must be one or must match the size of the vector.
4336 // If a single value is specified in the initializer then it will be
4337 // replicated to all the components of the vector
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004338 if (VTy->getVectorKind() == VectorType::AltiVecVector) {
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004339 // The number of initializers must be one or must match the size of the
4340 // vector. If a single value is specified in the initializer then it will
4341 // be replicated to all the components of the vector
4342 if (numExprs == 1) {
4343 QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
Richard Smith61ffd092011-10-27 23:31:58 +00004344 ExprResult Literal = DefaultLvalueConversion(exprs[0]);
4345 if (Literal.isInvalid())
4346 return ExprError();
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004347 Literal = ImpCastExprToType(Literal.take(), ElemTy,
John McCalla180f042011-10-06 23:25:11 +00004348 PrepareScalarCast(Literal, ElemTy));
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004349 return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.take());
4350 }
4351 else if (numExprs < numElems) {
4352 Diag(E->getExprLoc(),
4353 diag::err_incorrect_number_of_vector_initializers);
4354 return ExprError();
4355 }
4356 else
4357 for (unsigned i = 0, e = numExprs; i != e; ++i)
4358 initExprs.push_back(exprs[i]);
4359 }
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004360 else {
4361 // For OpenCL, when the number of initializers is a single value,
4362 // it will be replicated to all components of the vector.
4363 if (getLangOptions().OpenCL &&
4364 VTy->getVectorKind() == VectorType::GenericVector &&
4365 numExprs == 1) {
4366 QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
Richard Smith61ffd092011-10-27 23:31:58 +00004367 ExprResult Literal = DefaultLvalueConversion(exprs[0]);
4368 if (Literal.isInvalid())
4369 return ExprError();
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004370 Literal = ImpCastExprToType(Literal.take(), ElemTy,
John McCalla180f042011-10-06 23:25:11 +00004371 PrepareScalarCast(Literal, ElemTy));
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004372 return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.take());
4373 }
4374
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004375 for (unsigned i = 0, e = numExprs; i != e; ++i)
4376 initExprs.push_back(exprs[i]);
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004377 }
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004378 // FIXME: This means that pretty-printing the final AST will produce curly
4379 // braces instead of the original commas.
4380 InitListExpr *initE = new (Context) InitListExpr(Context, LParenLoc,
4381 &initExprs[0],
4382 initExprs.size(), RParenLoc);
4383 initE->setType(Ty);
4384 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, initE);
4385}
4386
Nate Begeman2ef13e52009-08-10 23:49:36 +00004387/// This is not an AltiVec-style cast, so turn the ParenListExpr into a sequence
4388/// of comma binary operators.
John McCall60d7b3a2010-08-24 06:29:42 +00004389ExprResult
Richard Trieuccd891a2011-09-09 01:45:06 +00004390Sema::MaybeConvertParenListExprToParenExpr(Scope *S, Expr *OrigExpr) {
4391 ParenListExpr *E = dyn_cast<ParenListExpr>(OrigExpr);
Nate Begeman2ef13e52009-08-10 23:49:36 +00004392 if (!E)
Richard Trieuccd891a2011-09-09 01:45:06 +00004393 return Owned(OrigExpr);
Mike Stump1eb44332009-09-09 15:08:12 +00004394
John McCall60d7b3a2010-08-24 06:29:42 +00004395 ExprResult Result(E->getExpr(0));
Mike Stump1eb44332009-09-09 15:08:12 +00004396
Nate Begeman2ef13e52009-08-10 23:49:36 +00004397 for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i)
John McCall9ae2f072010-08-23 23:25:46 +00004398 Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, Result.get(),
4399 E->getExpr(i));
Mike Stump1eb44332009-09-09 15:08:12 +00004400
John McCall9ae2f072010-08-23 23:25:46 +00004401 if (Result.isInvalid()) return ExprError();
4402
4403 return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), Result.get());
Nate Begeman2ef13e52009-08-10 23:49:36 +00004404}
4405
John McCall60d7b3a2010-08-24 06:29:42 +00004406ExprResult Sema::ActOnParenOrParenListExpr(SourceLocation L,
Richard Trieuccd891a2011-09-09 01:45:06 +00004407 SourceLocation R,
4408 MultiExprArg Val) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00004409 unsigned nexprs = Val.size();
4410 Expr **exprs = reinterpret_cast<Expr**>(Val.release());
Fariborz Jahanianf88f7ab2009-11-25 01:26:41 +00004411 assert((exprs != 0) && "ActOnParenOrParenListExpr() missing expr list");
4412 Expr *expr;
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004413 if (nexprs == 1)
Fariborz Jahanianf88f7ab2009-11-25 01:26:41 +00004414 expr = new (Context) ParenExpr(L, R, exprs[0]);
4415 else
Manuel Klimek0d9106f2011-06-22 20:02:16 +00004416 expr = new (Context) ParenListExpr(Context, L, exprs, nexprs, R,
4417 exprs[nexprs-1]->getType());
Nate Begeman2ef13e52009-08-10 23:49:36 +00004418 return Owned(expr);
4419}
4420
Chandler Carruth82214a82011-02-18 23:54:50 +00004421/// \brief Emit a specialized diagnostic when one expression is a null pointer
Richard Trieu26f96072011-09-02 01:51:02 +00004422/// constant and the other is not a pointer. Returns true if a diagnostic is
4423/// emitted.
Richard Trieu33fc7572011-09-06 20:06:39 +00004424bool Sema::DiagnoseConditionalForNull(Expr *LHSExpr, Expr *RHSExpr,
Chandler Carruth82214a82011-02-18 23:54:50 +00004425 SourceLocation QuestionLoc) {
Richard Trieu33fc7572011-09-06 20:06:39 +00004426 Expr *NullExpr = LHSExpr;
4427 Expr *NonPointerExpr = RHSExpr;
Chandler Carruth82214a82011-02-18 23:54:50 +00004428 Expr::NullPointerConstantKind NullKind =
4429 NullExpr->isNullPointerConstant(Context,
4430 Expr::NPC_ValueDependentIsNotNull);
4431
4432 if (NullKind == Expr::NPCK_NotNull) {
Richard Trieu33fc7572011-09-06 20:06:39 +00004433 NullExpr = RHSExpr;
4434 NonPointerExpr = LHSExpr;
Chandler Carruth82214a82011-02-18 23:54:50 +00004435 NullKind =
4436 NullExpr->isNullPointerConstant(Context,
4437 Expr::NPC_ValueDependentIsNotNull);
4438 }
4439
4440 if (NullKind == Expr::NPCK_NotNull)
4441 return false;
4442
4443 if (NullKind == Expr::NPCK_ZeroInteger) {
4444 // In this case, check to make sure that we got here from a "NULL"
4445 // string in the source code.
4446 NullExpr = NullExpr->IgnoreParenImpCasts();
John McCall834e3f62011-03-08 07:59:04 +00004447 SourceLocation loc = NullExpr->getExprLoc();
4448 if (!findMacroSpelling(loc, "NULL"))
Chandler Carruth82214a82011-02-18 23:54:50 +00004449 return false;
4450 }
4451
4452 int DiagType = (NullKind == Expr::NPCK_CXX0X_nullptr);
4453 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands_null)
4454 << NonPointerExpr->getType() << DiagType
4455 << NonPointerExpr->getSourceRange();
4456 return true;
4457}
4458
Richard Trieu26f96072011-09-02 01:51:02 +00004459/// \brief Return false if the condition expression is valid, true otherwise.
4460static bool checkCondition(Sema &S, Expr *Cond) {
4461 QualType CondTy = Cond->getType();
4462
4463 // C99 6.5.15p2
4464 if (CondTy->isScalarType()) return false;
4465
4466 // OpenCL: Sec 6.3.i says the condition is allowed to be a vector or scalar.
4467 if (S.getLangOptions().OpenCL && CondTy->isVectorType())
4468 return false;
4469
4470 // Emit the proper error message.
4471 S.Diag(Cond->getLocStart(), S.getLangOptions().OpenCL ?
4472 diag::err_typecheck_cond_expect_scalar :
4473 diag::err_typecheck_cond_expect_scalar_or_vector)
4474 << CondTy;
4475 return true;
4476}
4477
4478/// \brief Return false if the two expressions can be converted to a vector,
4479/// true otherwise
4480static bool checkConditionalConvertScalarsToVectors(Sema &S, ExprResult &LHS,
4481 ExprResult &RHS,
4482 QualType CondTy) {
4483 // Both operands should be of scalar type.
4484 if (!LHS.get()->getType()->isScalarType()) {
4485 S.Diag(LHS.get()->getLocStart(), diag::err_typecheck_cond_expect_scalar)
4486 << CondTy;
4487 return true;
4488 }
4489 if (!RHS.get()->getType()->isScalarType()) {
4490 S.Diag(RHS.get()->getLocStart(), diag::err_typecheck_cond_expect_scalar)
4491 << CondTy;
4492 return true;
4493 }
4494
4495 // Implicity convert these scalars to the type of the condition.
4496 LHS = S.ImpCastExprToType(LHS.take(), CondTy, CK_IntegralCast);
4497 RHS = S.ImpCastExprToType(RHS.take(), CondTy, CK_IntegralCast);
4498 return false;
4499}
4500
4501/// \brief Handle when one or both operands are void type.
4502static QualType checkConditionalVoidType(Sema &S, ExprResult &LHS,
4503 ExprResult &RHS) {
4504 Expr *LHSExpr = LHS.get();
4505 Expr *RHSExpr = RHS.get();
4506
4507 if (!LHSExpr->getType()->isVoidType())
4508 S.Diag(RHSExpr->getLocStart(), diag::ext_typecheck_cond_one_void)
4509 << RHSExpr->getSourceRange();
4510 if (!RHSExpr->getType()->isVoidType())
4511 S.Diag(LHSExpr->getLocStart(), diag::ext_typecheck_cond_one_void)
4512 << LHSExpr->getSourceRange();
4513 LHS = S.ImpCastExprToType(LHS.take(), S.Context.VoidTy, CK_ToVoid);
4514 RHS = S.ImpCastExprToType(RHS.take(), S.Context.VoidTy, CK_ToVoid);
4515 return S.Context.VoidTy;
4516}
4517
4518/// \brief Return false if the NullExpr can be promoted to PointerTy,
4519/// true otherwise.
4520static bool checkConditionalNullPointer(Sema &S, ExprResult &NullExpr,
4521 QualType PointerTy) {
4522 if ((!PointerTy->isAnyPointerType() && !PointerTy->isBlockPointerType()) ||
4523 !NullExpr.get()->isNullPointerConstant(S.Context,
4524 Expr::NPC_ValueDependentIsNull))
4525 return true;
4526
4527 NullExpr = S.ImpCastExprToType(NullExpr.take(), PointerTy, CK_NullToPointer);
4528 return false;
4529}
4530
4531/// \brief Checks compatibility between two pointers and return the resulting
4532/// type.
4533static QualType checkConditionalPointerCompatibility(Sema &S, ExprResult &LHS,
4534 ExprResult &RHS,
4535 SourceLocation Loc) {
4536 QualType LHSTy = LHS.get()->getType();
4537 QualType RHSTy = RHS.get()->getType();
4538
4539 if (S.Context.hasSameType(LHSTy, RHSTy)) {
4540 // Two identical pointers types are always compatible.
4541 return LHSTy;
4542 }
4543
4544 QualType lhptee, rhptee;
4545
4546 // Get the pointee types.
John McCall1d9b3b22011-09-09 05:25:32 +00004547 if (const BlockPointerType *LHSBTy = LHSTy->getAs<BlockPointerType>()) {
4548 lhptee = LHSBTy->getPointeeType();
4549 rhptee = RHSTy->castAs<BlockPointerType>()->getPointeeType();
Richard Trieu26f96072011-09-02 01:51:02 +00004550 } else {
John McCall1d9b3b22011-09-09 05:25:32 +00004551 lhptee = LHSTy->castAs<PointerType>()->getPointeeType();
4552 rhptee = RHSTy->castAs<PointerType>()->getPointeeType();
Richard Trieu26f96072011-09-02 01:51:02 +00004553 }
4554
4555 if (!S.Context.typesAreCompatible(lhptee.getUnqualifiedType(),
4556 rhptee.getUnqualifiedType())) {
4557 S.Diag(Loc, diag::warn_typecheck_cond_incompatible_pointers)
4558 << LHSTy << RHSTy << LHS.get()->getSourceRange()
4559 << RHS.get()->getSourceRange();
4560 // In this situation, we assume void* type. No especially good
4561 // reason, but this is what gcc does, and we do have to pick
4562 // to get a consistent AST.
4563 QualType incompatTy = S.Context.getPointerType(S.Context.VoidTy);
4564 LHS = S.ImpCastExprToType(LHS.take(), incompatTy, CK_BitCast);
4565 RHS = S.ImpCastExprToType(RHS.take(), incompatTy, CK_BitCast);
4566 return incompatTy;
4567 }
4568
4569 // The pointer types are compatible.
4570 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to
4571 // differently qualified versions of compatible types, the result type is
4572 // a pointer to an appropriately qualified version of the *composite*
4573 // type.
4574 // FIXME: Need to calculate the composite type.
4575 // FIXME: Need to add qualifiers
4576
4577 LHS = S.ImpCastExprToType(LHS.take(), LHSTy, CK_BitCast);
4578 RHS = S.ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
4579 return LHSTy;
4580}
4581
4582/// \brief Return the resulting type when the operands are both block pointers.
4583static QualType checkConditionalBlockPointerCompatibility(Sema &S,
4584 ExprResult &LHS,
4585 ExprResult &RHS,
4586 SourceLocation Loc) {
4587 QualType LHSTy = LHS.get()->getType();
4588 QualType RHSTy = RHS.get()->getType();
4589
4590 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) {
4591 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) {
4592 QualType destType = S.Context.getPointerType(S.Context.VoidTy);
4593 LHS = S.ImpCastExprToType(LHS.take(), destType, CK_BitCast);
4594 RHS = S.ImpCastExprToType(RHS.take(), destType, CK_BitCast);
4595 return destType;
4596 }
4597 S.Diag(Loc, diag::err_typecheck_cond_incompatible_operands)
4598 << LHSTy << RHSTy << LHS.get()->getSourceRange()
4599 << RHS.get()->getSourceRange();
4600 return QualType();
4601 }
4602
4603 // We have 2 block pointer types.
4604 return checkConditionalPointerCompatibility(S, LHS, RHS, Loc);
4605}
4606
4607/// \brief Return the resulting type when the operands are both pointers.
4608static QualType
4609checkConditionalObjectPointersCompatibility(Sema &S, ExprResult &LHS,
4610 ExprResult &RHS,
4611 SourceLocation Loc) {
4612 // get the pointer types
4613 QualType LHSTy = LHS.get()->getType();
4614 QualType RHSTy = RHS.get()->getType();
4615
4616 // get the "pointed to" types
4617 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
4618 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
4619
4620 // ignore qualifiers on void (C99 6.5.15p3, clause 6)
4621 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) {
4622 // Figure out necessary qualifiers (C99 6.5.15p6)
4623 QualType destPointee
4624 = S.Context.getQualifiedType(lhptee, rhptee.getQualifiers());
4625 QualType destType = S.Context.getPointerType(destPointee);
4626 // Add qualifiers if necessary.
4627 LHS = S.ImpCastExprToType(LHS.take(), destType, CK_NoOp);
4628 // Promote to void*.
4629 RHS = S.ImpCastExprToType(RHS.take(), destType, CK_BitCast);
4630 return destType;
4631 }
4632 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) {
4633 QualType destPointee
4634 = S.Context.getQualifiedType(rhptee, lhptee.getQualifiers());
4635 QualType destType = S.Context.getPointerType(destPointee);
4636 // Add qualifiers if necessary.
4637 RHS = S.ImpCastExprToType(RHS.take(), destType, CK_NoOp);
4638 // Promote to void*.
4639 LHS = S.ImpCastExprToType(LHS.take(), destType, CK_BitCast);
4640 return destType;
4641 }
4642
4643 return checkConditionalPointerCompatibility(S, LHS, RHS, Loc);
4644}
4645
4646/// \brief Return false if the first expression is not an integer and the second
4647/// expression is not a pointer, true otherwise.
4648static bool checkPointerIntegerMismatch(Sema &S, ExprResult &Int,
4649 Expr* PointerExpr, SourceLocation Loc,
Richard Trieuccd891a2011-09-09 01:45:06 +00004650 bool IsIntFirstExpr) {
Richard Trieu26f96072011-09-02 01:51:02 +00004651 if (!PointerExpr->getType()->isPointerType() ||
4652 !Int.get()->getType()->isIntegerType())
4653 return false;
4654
Richard Trieuccd891a2011-09-09 01:45:06 +00004655 Expr *Expr1 = IsIntFirstExpr ? Int.get() : PointerExpr;
4656 Expr *Expr2 = IsIntFirstExpr ? PointerExpr : Int.get();
Richard Trieu26f96072011-09-02 01:51:02 +00004657
4658 S.Diag(Loc, diag::warn_typecheck_cond_pointer_integer_mismatch)
4659 << Expr1->getType() << Expr2->getType()
4660 << Expr1->getSourceRange() << Expr2->getSourceRange();
4661 Int = S.ImpCastExprToType(Int.take(), PointerExpr->getType(),
4662 CK_IntegralToPointer);
4663 return true;
4664}
4665
Richard Trieu33fc7572011-09-06 20:06:39 +00004666/// Note that LHS is not null here, even if this is the gnu "x ?: y" extension.
4667/// In that case, LHS = cond.
Chris Lattnera119a3b2009-02-18 04:38:20 +00004668/// C99 6.5.15
Richard Trieu67e29332011-08-02 04:35:43 +00004669QualType Sema::CheckConditionalOperands(ExprResult &Cond, ExprResult &LHS,
4670 ExprResult &RHS, ExprValueKind &VK,
4671 ExprObjectKind &OK,
Chris Lattnera119a3b2009-02-18 04:38:20 +00004672 SourceLocation QuestionLoc) {
Douglas Gregorfadb53b2011-03-12 01:48:56 +00004673
Richard Trieu33fc7572011-09-06 20:06:39 +00004674 ExprResult LHSResult = CheckPlaceholderExpr(LHS.get());
4675 if (!LHSResult.isUsable()) return QualType();
4676 LHS = move(LHSResult);
Douglas Gregor7ad5d422010-11-09 21:07:58 +00004677
Richard Trieu33fc7572011-09-06 20:06:39 +00004678 ExprResult RHSResult = CheckPlaceholderExpr(RHS.get());
4679 if (!RHSResult.isUsable()) return QualType();
4680 RHS = move(RHSResult);
Douglas Gregor7ad5d422010-11-09 21:07:58 +00004681
Sebastian Redl3201f6b2009-04-16 17:51:27 +00004682 // C++ is sufficiently different to merit its own checker.
4683 if (getLangOptions().CPlusPlus)
John McCall56ca35d2011-02-17 10:25:35 +00004684 return CXXCheckConditionalOperands(Cond, LHS, RHS, VK, OK, QuestionLoc);
John McCallf89e55a2010-11-18 06:31:45 +00004685
4686 VK = VK_RValue;
John McCall09431682010-11-18 19:01:18 +00004687 OK = OK_Ordinary;
Sebastian Redl3201f6b2009-04-16 17:51:27 +00004688
John Wiegley429bb272011-04-08 18:41:53 +00004689 Cond = UsualUnaryConversions(Cond.take());
4690 if (Cond.isInvalid())
4691 return QualType();
4692 LHS = UsualUnaryConversions(LHS.take());
4693 if (LHS.isInvalid())
4694 return QualType();
4695 RHS = UsualUnaryConversions(RHS.take());
4696 if (RHS.isInvalid())
4697 return QualType();
4698
4699 QualType CondTy = Cond.get()->getType();
4700 QualType LHSTy = LHS.get()->getType();
4701 QualType RHSTy = RHS.get()->getType();
Steve Naroffc80b4ee2007-07-16 21:54:35 +00004702
Reid Spencer5f016e22007-07-11 17:01:13 +00004703 // first, check the condition.
Richard Trieu26f96072011-09-02 01:51:02 +00004704 if (checkCondition(*this, Cond.get()))
4705 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00004706
Chris Lattner70d67a92008-01-06 22:42:25 +00004707 // Now check the two expressions.
Nate Begeman2ef13e52009-08-10 23:49:36 +00004708 if (LHSTy->isVectorType() || RHSTy->isVectorType())
Eli Friedmanb9b4b782011-06-23 18:10:35 +00004709 return CheckVectorOperands(LHS, RHS, QuestionLoc, /*isCompAssign*/false);
Douglas Gregor898574e2008-12-05 23:32:09 +00004710
Nate Begeman6155d732010-09-20 22:41:17 +00004711 // OpenCL: If the condition is a vector, and both operands are scalar,
4712 // attempt to implicity convert them to the vector type to act like the
4713 // built in select.
Richard Trieu26f96072011-09-02 01:51:02 +00004714 if (getLangOptions().OpenCL && CondTy->isVectorType())
4715 if (checkConditionalConvertScalarsToVectors(*this, LHS, RHS, CondTy))
Nate Begeman6155d732010-09-20 22:41:17 +00004716 return QualType();
Nate Begeman6155d732010-09-20 22:41:17 +00004717
Chris Lattner70d67a92008-01-06 22:42:25 +00004718 // If both operands have arithmetic type, do the usual arithmetic conversions
4719 // to find a common type: C99 6.5.15p3,5.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004720 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) {
4721 UsualArithmeticConversions(LHS, RHS);
John Wiegley429bb272011-04-08 18:41:53 +00004722 if (LHS.isInvalid() || RHS.isInvalid())
4723 return QualType();
4724 return LHS.get()->getType();
Steve Naroffa4332e22007-07-17 00:58:39 +00004725 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00004726
Chris Lattner70d67a92008-01-06 22:42:25 +00004727 // If both operands are the same structure or union type, the result is that
4728 // type.
Ted Kremenek6217b802009-07-29 21:53:49 +00004729 if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3
4730 if (const RecordType *RHSRT = RHSTy->getAs<RecordType>())
Chris Lattnera21ddb32007-11-26 01:40:58 +00004731 if (LHSRT->getDecl() == RHSRT->getDecl())
Mike Stumpeed9cac2009-02-19 03:04:26 +00004732 // "If both the operands have structure or union type, the result has
Chris Lattner70d67a92008-01-06 22:42:25 +00004733 // that type." This implies that CV qualifiers are dropped.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004734 return LHSTy.getUnqualifiedType();
Eli Friedmanb1d796d2009-03-23 00:24:07 +00004735 // FIXME: Type of conditional expression must be complete in C mode.
Reid Spencer5f016e22007-07-11 17:01:13 +00004736 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00004737
Chris Lattner70d67a92008-01-06 22:42:25 +00004738 // C99 6.5.15p5: "If both operands have void type, the result has void type."
Steve Naroffe701c0a2008-05-12 21:44:38 +00004739 // The following || allows only one side to be void (a GCC-ism).
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004740 if (LHSTy->isVoidType() || RHSTy->isVoidType()) {
Richard Trieu26f96072011-09-02 01:51:02 +00004741 return checkConditionalVoidType(*this, LHS, RHS);
Steve Naroffe701c0a2008-05-12 21:44:38 +00004742 }
Richard Trieu26f96072011-09-02 01:51:02 +00004743
Steve Naroffb6d54e52008-01-08 01:11:38 +00004744 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has
4745 // the type of the other operand."
Richard Trieu26f96072011-09-02 01:51:02 +00004746 if (!checkConditionalNullPointer(*this, RHS, LHSTy)) return LHSTy;
4747 if (!checkConditionalNullPointer(*this, LHS, RHSTy)) return RHSTy;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004748
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004749 // All objective-c pointer type analysis is done here.
4750 QualType compositeType = FindCompositeObjCPointerType(LHS, RHS,
4751 QuestionLoc);
John Wiegley429bb272011-04-08 18:41:53 +00004752 if (LHS.isInvalid() || RHS.isInvalid())
4753 return QualType();
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004754 if (!compositeType.isNull())
4755 return compositeType;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004756
4757
Steve Naroff7154a772009-07-01 14:36:47 +00004758 // Handle block pointer types.
Richard Trieu26f96072011-09-02 01:51:02 +00004759 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType())
4760 return checkConditionalBlockPointerCompatibility(*this, LHS, RHS,
4761 QuestionLoc);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004762
Steve Naroff7154a772009-07-01 14:36:47 +00004763 // Check constraints for C object pointers types (C99 6.5.15p3,6).
Richard Trieu26f96072011-09-02 01:51:02 +00004764 if (LHSTy->isPointerType() && RHSTy->isPointerType())
4765 return checkConditionalObjectPointersCompatibility(*this, LHS, RHS,
4766 QuestionLoc);
Mike Stump1eb44332009-09-09 15:08:12 +00004767
John McCall404cd162010-11-13 01:35:44 +00004768 // GCC compatibility: soften pointer/integer mismatch. Note that
4769 // null pointers have been filtered out by this point.
Richard Trieu26f96072011-09-02 01:51:02 +00004770 if (checkPointerIntegerMismatch(*this, LHS, RHS.get(), QuestionLoc,
4771 /*isIntFirstExpr=*/true))
Steve Naroff7154a772009-07-01 14:36:47 +00004772 return RHSTy;
Richard Trieu26f96072011-09-02 01:51:02 +00004773 if (checkPointerIntegerMismatch(*this, RHS, LHS.get(), QuestionLoc,
4774 /*isIntFirstExpr=*/false))
Steve Naroff7154a772009-07-01 14:36:47 +00004775 return LHSTy;
Daniel Dunbar5e155f02008-09-11 23:12:46 +00004776
Chandler Carruth82214a82011-02-18 23:54:50 +00004777 // Emit a better diagnostic if one of the expressions is a null pointer
4778 // constant and the other is not a pointer type. In this case, the user most
4779 // likely forgot to take the address of the other expression.
John Wiegley429bb272011-04-08 18:41:53 +00004780 if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
Chandler Carruth82214a82011-02-18 23:54:50 +00004781 return QualType();
4782
Chris Lattner70d67a92008-01-06 22:42:25 +00004783 // Otherwise, the operands are not compatible.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004784 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
Richard Trieu67e29332011-08-02 04:35:43 +00004785 << LHSTy << RHSTy << LHS.get()->getSourceRange()
4786 << RHS.get()->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00004787 return QualType();
4788}
4789
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004790/// FindCompositeObjCPointerType - Helper method to find composite type of
4791/// two objective-c pointer types of the two input expressions.
John Wiegley429bb272011-04-08 18:41:53 +00004792QualType Sema::FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
Richard Trieu67e29332011-08-02 04:35:43 +00004793 SourceLocation QuestionLoc) {
John Wiegley429bb272011-04-08 18:41:53 +00004794 QualType LHSTy = LHS.get()->getType();
4795 QualType RHSTy = RHS.get()->getType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004796
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004797 // Handle things like Class and struct objc_class*. Here we case the result
4798 // to the pseudo-builtin, because that will be implicitly cast back to the
4799 // redefinition type if an attempt is made to access its fields.
4800 if (LHSTy->isObjCClassType() &&
Douglas Gregor01a4cf12011-08-11 20:58:55 +00004801 (Context.hasSameType(RHSTy, Context.getObjCClassRedefinitionType()))) {
John McCall1d9b3b22011-09-09 05:25:32 +00004802 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_CPointerToObjCPointerCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004803 return LHSTy;
4804 }
4805 if (RHSTy->isObjCClassType() &&
Douglas Gregor01a4cf12011-08-11 20:58:55 +00004806 (Context.hasSameType(LHSTy, Context.getObjCClassRedefinitionType()))) {
John McCall1d9b3b22011-09-09 05:25:32 +00004807 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_CPointerToObjCPointerCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004808 return RHSTy;
4809 }
4810 // And the same for struct objc_object* / id
4811 if (LHSTy->isObjCIdType() &&
Douglas Gregor01a4cf12011-08-11 20:58:55 +00004812 (Context.hasSameType(RHSTy, Context.getObjCIdRedefinitionType()))) {
John McCall1d9b3b22011-09-09 05:25:32 +00004813 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_CPointerToObjCPointerCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004814 return LHSTy;
4815 }
4816 if (RHSTy->isObjCIdType() &&
Douglas Gregor01a4cf12011-08-11 20:58:55 +00004817 (Context.hasSameType(LHSTy, Context.getObjCIdRedefinitionType()))) {
John McCall1d9b3b22011-09-09 05:25:32 +00004818 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_CPointerToObjCPointerCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004819 return RHSTy;
4820 }
4821 // And the same for struct objc_selector* / SEL
4822 if (Context.isObjCSelType(LHSTy) &&
Douglas Gregor01a4cf12011-08-11 20:58:55 +00004823 (Context.hasSameType(RHSTy, Context.getObjCSelRedefinitionType()))) {
John Wiegley429bb272011-04-08 18:41:53 +00004824 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004825 return LHSTy;
4826 }
4827 if (Context.isObjCSelType(RHSTy) &&
Douglas Gregor01a4cf12011-08-11 20:58:55 +00004828 (Context.hasSameType(LHSTy, Context.getObjCSelRedefinitionType()))) {
John Wiegley429bb272011-04-08 18:41:53 +00004829 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004830 return RHSTy;
4831 }
4832 // Check constraints for Objective-C object pointers types.
4833 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004834
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004835 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
4836 // Two identical object pointer types are always compatible.
4837 return LHSTy;
4838 }
John McCall1d9b3b22011-09-09 05:25:32 +00004839 const ObjCObjectPointerType *LHSOPT = LHSTy->castAs<ObjCObjectPointerType>();
4840 const ObjCObjectPointerType *RHSOPT = RHSTy->castAs<ObjCObjectPointerType>();
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004841 QualType compositeType = LHSTy;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004842
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004843 // If both operands are interfaces and either operand can be
4844 // assigned to the other, use that type as the composite
4845 // type. This allows
4846 // xxx ? (A*) a : (B*) b
4847 // where B is a subclass of A.
4848 //
4849 // Additionally, as for assignment, if either type is 'id'
4850 // allow silent coercion. Finally, if the types are
4851 // incompatible then make sure to use 'id' as the composite
4852 // type so the result is acceptable for sending messages to.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004853
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004854 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'.
4855 // It could return the composite type.
4856 if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) {
4857 compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy;
4858 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) {
4859 compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy;
4860 } else if ((LHSTy->isObjCQualifiedIdType() ||
4861 RHSTy->isObjCQualifiedIdType()) &&
4862 Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) {
4863 // Need to handle "id<xx>" explicitly.
4864 // GCC allows qualified id and any Objective-C type to devolve to
4865 // id. Currently localizing to here until clear this should be
4866 // part of ObjCQualifiedIdTypesAreCompatible.
4867 compositeType = Context.getObjCIdType();
4868 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) {
4869 compositeType = Context.getObjCIdType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004870 } else if (!(compositeType =
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004871 Context.areCommonBaseCompatible(LHSOPT, RHSOPT)).isNull())
4872 ;
4873 else {
4874 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands)
4875 << LHSTy << RHSTy
John Wiegley429bb272011-04-08 18:41:53 +00004876 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004877 QualType incompatTy = Context.getObjCIdType();
John Wiegley429bb272011-04-08 18:41:53 +00004878 LHS = ImpCastExprToType(LHS.take(), incompatTy, CK_BitCast);
4879 RHS = ImpCastExprToType(RHS.take(), incompatTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004880 return incompatTy;
4881 }
4882 // The object pointer types are compatible.
John Wiegley429bb272011-04-08 18:41:53 +00004883 LHS = ImpCastExprToType(LHS.take(), compositeType, CK_BitCast);
4884 RHS = ImpCastExprToType(RHS.take(), compositeType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004885 return compositeType;
4886 }
4887 // Check Objective-C object pointer types and 'void *'
4888 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) {
4889 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
4890 QualType rhptee = RHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
4891 QualType destPointee
4892 = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
4893 QualType destType = Context.getPointerType(destPointee);
4894 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00004895 LHS = ImpCastExprToType(LHS.take(), destType, CK_NoOp);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004896 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00004897 RHS = ImpCastExprToType(RHS.take(), destType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004898 return destType;
4899 }
4900 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) {
4901 QualType lhptee = LHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
4902 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
4903 QualType destPointee
4904 = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
4905 QualType destType = Context.getPointerType(destPointee);
4906 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00004907 RHS = ImpCastExprToType(RHS.take(), destType, CK_NoOp);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004908 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00004909 LHS = ImpCastExprToType(LHS.take(), destType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004910 return destType;
4911 }
4912 return QualType();
4913}
4914
Chandler Carruthf0b60d62011-06-16 01:05:14 +00004915/// SuggestParentheses - Emit a note with a fixit hint that wraps
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004916/// ParenRange in parentheses.
4917static void SuggestParentheses(Sema &Self, SourceLocation Loc,
Chandler Carruthf0b60d62011-06-16 01:05:14 +00004918 const PartialDiagnostic &Note,
4919 SourceRange ParenRange) {
4920 SourceLocation EndLoc = Self.PP.getLocForEndOfToken(ParenRange.getEnd());
4921 if (ParenRange.getBegin().isFileID() && ParenRange.getEnd().isFileID() &&
4922 EndLoc.isValid()) {
4923 Self.Diag(Loc, Note)
4924 << FixItHint::CreateInsertion(ParenRange.getBegin(), "(")
4925 << FixItHint::CreateInsertion(EndLoc, ")");
4926 } else {
4927 // We can't display the parentheses, so just show the bare note.
4928 Self.Diag(Loc, Note) << ParenRange;
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004929 }
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004930}
4931
4932static bool IsArithmeticOp(BinaryOperatorKind Opc) {
4933 return Opc >= BO_Mul && Opc <= BO_Shr;
4934}
4935
Hans Wennborg2f072b42011-06-09 17:06:51 +00004936/// IsArithmeticBinaryExpr - Returns true if E is an arithmetic binary
4937/// expression, either using a built-in or overloaded operator,
Richard Trieu33fc7572011-09-06 20:06:39 +00004938/// and sets *OpCode to the opcode and *RHSExprs to the right-hand side
4939/// expression.
Hans Wennborg2f072b42011-06-09 17:06:51 +00004940static bool IsArithmeticBinaryExpr(Expr *E, BinaryOperatorKind *Opcode,
Richard Trieu33fc7572011-09-06 20:06:39 +00004941 Expr **RHSExprs) {
Hans Wennborgcb4d7c22011-09-12 12:07:30 +00004942 // Don't strip parenthesis: we should not warn if E is in parenthesis.
4943 E = E->IgnoreImpCasts();
Hans Wennborg2f072b42011-06-09 17:06:51 +00004944 E = E->IgnoreConversionOperator();
Hans Wennborgcb4d7c22011-09-12 12:07:30 +00004945 E = E->IgnoreImpCasts();
Hans Wennborg2f072b42011-06-09 17:06:51 +00004946
4947 // Built-in binary operator.
4948 if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E)) {
4949 if (IsArithmeticOp(OP->getOpcode())) {
4950 *Opcode = OP->getOpcode();
Richard Trieu33fc7572011-09-06 20:06:39 +00004951 *RHSExprs = OP->getRHS();
Hans Wennborg2f072b42011-06-09 17:06:51 +00004952 return true;
4953 }
4954 }
4955
4956 // Overloaded operator.
4957 if (CXXOperatorCallExpr *Call = dyn_cast<CXXOperatorCallExpr>(E)) {
4958 if (Call->getNumArgs() != 2)
4959 return false;
4960
4961 // Make sure this is really a binary operator that is safe to pass into
4962 // BinaryOperator::getOverloadedOpcode(), e.g. it's not a subscript op.
4963 OverloadedOperatorKind OO = Call->getOperator();
4964 if (OO < OO_Plus || OO > OO_Arrow)
4965 return false;
4966
4967 BinaryOperatorKind OpKind = BinaryOperator::getOverloadedOpcode(OO);
4968 if (IsArithmeticOp(OpKind)) {
4969 *Opcode = OpKind;
Richard Trieu33fc7572011-09-06 20:06:39 +00004970 *RHSExprs = Call->getArg(1);
Hans Wennborg2f072b42011-06-09 17:06:51 +00004971 return true;
4972 }
4973 }
4974
4975 return false;
4976}
4977
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004978static bool IsLogicOp(BinaryOperatorKind Opc) {
4979 return (Opc >= BO_LT && Opc <= BO_NE) || (Opc >= BO_LAnd && Opc <= BO_LOr);
4980}
4981
Hans Wennborg2f072b42011-06-09 17:06:51 +00004982/// ExprLooksBoolean - Returns true if E looks boolean, i.e. it has boolean type
4983/// or is a logical expression such as (x==y) which has int type, but is
4984/// commonly interpreted as boolean.
4985static bool ExprLooksBoolean(Expr *E) {
4986 E = E->IgnoreParenImpCasts();
4987
4988 if (E->getType()->isBooleanType())
4989 return true;
4990 if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E))
4991 return IsLogicOp(OP->getOpcode());
4992 if (UnaryOperator *OP = dyn_cast<UnaryOperator>(E))
4993 return OP->getOpcode() == UO_LNot;
4994
4995 return false;
4996}
4997
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004998/// DiagnoseConditionalPrecedence - Emit a warning when a conditional operator
4999/// and binary operator are mixed in a way that suggests the programmer assumed
5000/// the conditional operator has higher precedence, for example:
5001/// "int x = a + someBinaryCondition ? 1 : 2".
5002static void DiagnoseConditionalPrecedence(Sema &Self,
5003 SourceLocation OpLoc,
Chandler Carruth43bc78d2011-06-16 01:05:08 +00005004 Expr *Condition,
Richard Trieu33fc7572011-09-06 20:06:39 +00005005 Expr *LHSExpr,
5006 Expr *RHSExpr) {
Hans Wennborg2f072b42011-06-09 17:06:51 +00005007 BinaryOperatorKind CondOpcode;
5008 Expr *CondRHS;
Hans Wennborg9cfdae32011-06-03 18:00:36 +00005009
Chandler Carruth43bc78d2011-06-16 01:05:08 +00005010 if (!IsArithmeticBinaryExpr(Condition, &CondOpcode, &CondRHS))
Hans Wennborg2f072b42011-06-09 17:06:51 +00005011 return;
5012 if (!ExprLooksBoolean(CondRHS))
5013 return;
Hans Wennborg9cfdae32011-06-03 18:00:36 +00005014
Hans Wennborg2f072b42011-06-09 17:06:51 +00005015 // The condition is an arithmetic binary expression, with a right-
5016 // hand side that looks boolean, so warn.
Hans Wennborg9cfdae32011-06-03 18:00:36 +00005017
Chandler Carruthf0b60d62011-06-16 01:05:14 +00005018 Self.Diag(OpLoc, diag::warn_precedence_conditional)
Chandler Carruth43bc78d2011-06-16 01:05:08 +00005019 << Condition->getSourceRange()
Hans Wennborg2f072b42011-06-09 17:06:51 +00005020 << BinaryOperator::getOpcodeStr(CondOpcode);
Hans Wennborg9cfdae32011-06-03 18:00:36 +00005021
Chandler Carruthf0b60d62011-06-16 01:05:14 +00005022 SuggestParentheses(Self, OpLoc,
5023 Self.PDiag(diag::note_precedence_conditional_silence)
5024 << BinaryOperator::getOpcodeStr(CondOpcode),
5025 SourceRange(Condition->getLocStart(), Condition->getLocEnd()));
Chandler Carruth9d5353c2011-06-21 23:04:18 +00005026
5027 SuggestParentheses(Self, OpLoc,
5028 Self.PDiag(diag::note_precedence_conditional_first),
Richard Trieu33fc7572011-09-06 20:06:39 +00005029 SourceRange(CondRHS->getLocStart(), RHSExpr->getLocEnd()));
Hans Wennborg9cfdae32011-06-03 18:00:36 +00005030}
5031
Steve Narofff69936d2007-09-16 03:34:24 +00005032/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null
Reid Spencer5f016e22007-07-11 17:01:13 +00005033/// in the case of a the GNU conditional expr extension.
John McCall60d7b3a2010-08-24 06:29:42 +00005034ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc,
John McCall56ca35d2011-02-17 10:25:35 +00005035 SourceLocation ColonLoc,
5036 Expr *CondExpr, Expr *LHSExpr,
5037 Expr *RHSExpr) {
Chris Lattnera21ddb32007-11-26 01:40:58 +00005038 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS
5039 // was the condition.
John McCall56ca35d2011-02-17 10:25:35 +00005040 OpaqueValueExpr *opaqueValue = 0;
5041 Expr *commonExpr = 0;
5042 if (LHSExpr == 0) {
5043 commonExpr = CondExpr;
5044
5045 // We usually want to apply unary conversions *before* saving, except
5046 // in the special case of a C++ l-value conditional.
5047 if (!(getLangOptions().CPlusPlus
5048 && !commonExpr->isTypeDependent()
5049 && commonExpr->getValueKind() == RHSExpr->getValueKind()
5050 && commonExpr->isGLValue()
5051 && commonExpr->isOrdinaryOrBitFieldObject()
5052 && RHSExpr->isOrdinaryOrBitFieldObject()
5053 && Context.hasSameType(commonExpr->getType(), RHSExpr->getType()))) {
John Wiegley429bb272011-04-08 18:41:53 +00005054 ExprResult commonRes = UsualUnaryConversions(commonExpr);
5055 if (commonRes.isInvalid())
5056 return ExprError();
5057 commonExpr = commonRes.take();
John McCall56ca35d2011-02-17 10:25:35 +00005058 }
5059
5060 opaqueValue = new (Context) OpaqueValueExpr(commonExpr->getExprLoc(),
5061 commonExpr->getType(),
5062 commonExpr->getValueKind(),
5063 commonExpr->getObjectKind());
5064 LHSExpr = CondExpr = opaqueValue;
Fariborz Jahanianf9b949f2010-08-31 18:02:20 +00005065 }
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005066
John McCallf89e55a2010-11-18 06:31:45 +00005067 ExprValueKind VK = VK_RValue;
John McCall09431682010-11-18 19:01:18 +00005068 ExprObjectKind OK = OK_Ordinary;
John Wiegley429bb272011-04-08 18:41:53 +00005069 ExprResult Cond = Owned(CondExpr), LHS = Owned(LHSExpr), RHS = Owned(RHSExpr);
5070 QualType result = CheckConditionalOperands(Cond, LHS, RHS,
John McCall56ca35d2011-02-17 10:25:35 +00005071 VK, OK, QuestionLoc);
John Wiegley429bb272011-04-08 18:41:53 +00005072 if (result.isNull() || Cond.isInvalid() || LHS.isInvalid() ||
5073 RHS.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005074 return ExprError();
5075
Hans Wennborg9cfdae32011-06-03 18:00:36 +00005076 DiagnoseConditionalPrecedence(*this, QuestionLoc, Cond.get(), LHS.get(),
5077 RHS.get());
5078
John McCall56ca35d2011-02-17 10:25:35 +00005079 if (!commonExpr)
John Wiegley429bb272011-04-08 18:41:53 +00005080 return Owned(new (Context) ConditionalOperator(Cond.take(), QuestionLoc,
5081 LHS.take(), ColonLoc,
5082 RHS.take(), result, VK, OK));
John McCall56ca35d2011-02-17 10:25:35 +00005083
5084 return Owned(new (Context)
John Wiegley429bb272011-04-08 18:41:53 +00005085 BinaryConditionalOperator(commonExpr, opaqueValue, Cond.take(), LHS.take(),
Richard Trieu67e29332011-08-02 04:35:43 +00005086 RHS.take(), QuestionLoc, ColonLoc, result, VK,
5087 OK));
Reid Spencer5f016e22007-07-11 17:01:13 +00005088}
5089
John McCalle4be87e2011-01-31 23:13:11 +00005090// checkPointerTypesForAssignment - This is a very tricky routine (despite
Mike Stumpeed9cac2009-02-19 03:04:26 +00005091// being closely modeled after the C99 spec:-). The odd characteristic of this
Reid Spencer5f016e22007-07-11 17:01:13 +00005092// routine is it effectively iqnores the qualifiers on the top level pointee.
5093// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3].
5094// FIXME: add a couple examples in this comment.
John McCalle4be87e2011-01-31 23:13:11 +00005095static Sema::AssignConvertType
Richard Trieu1da27a12011-09-06 20:21:22 +00005096checkPointerTypesForAssignment(Sema &S, QualType LHSType, QualType RHSType) {
5097 assert(LHSType.isCanonical() && "LHS not canonicalized!");
5098 assert(RHSType.isCanonical() && "RHS not canonicalized!");
Mike Stumpeed9cac2009-02-19 03:04:26 +00005099
Reid Spencer5f016e22007-07-11 17:01:13 +00005100 // get the "pointed to" type (ignoring qualifiers at the top level)
John McCall86c05f32011-02-01 00:10:29 +00005101 const Type *lhptee, *rhptee;
5102 Qualifiers lhq, rhq;
Richard Trieu1da27a12011-09-06 20:21:22 +00005103 llvm::tie(lhptee, lhq) = cast<PointerType>(LHSType)->getPointeeType().split();
5104 llvm::tie(rhptee, rhq) = cast<PointerType>(RHSType)->getPointeeType().split();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005105
John McCalle4be87e2011-01-31 23:13:11 +00005106 Sema::AssignConvertType ConvTy = Sema::Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005107
5108 // C99 6.5.16.1p1: This following citation is common to constraints
5109 // 3 & 4 (below). ...and the type *pointed to* by the left has all the
5110 // qualifiers of the type *pointed to* by the right;
John McCall86c05f32011-02-01 00:10:29 +00005111 Qualifiers lq;
5112
John McCallf85e1932011-06-15 23:02:42 +00005113 // As a special case, 'non-__weak A *' -> 'non-__weak const *' is okay.
5114 if (lhq.getObjCLifetime() != rhq.getObjCLifetime() &&
5115 lhq.compatiblyIncludesObjCLifetime(rhq)) {
5116 // Ignore lifetime for further calculation.
5117 lhq.removeObjCLifetime();
5118 rhq.removeObjCLifetime();
5119 }
5120
John McCall86c05f32011-02-01 00:10:29 +00005121 if (!lhq.compatiblyIncludes(rhq)) {
5122 // Treat address-space mismatches as fatal. TODO: address subspaces
5123 if (lhq.getAddressSpace() != rhq.getAddressSpace())
5124 ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
5125
John McCallf85e1932011-06-15 23:02:42 +00005126 // It's okay to add or remove GC or lifetime qualifiers when converting to
John McCall22348732011-03-26 02:56:45 +00005127 // and from void*.
John McCallf85e1932011-06-15 23:02:42 +00005128 else if (lhq.withoutObjCGCAttr().withoutObjCGLifetime()
5129 .compatiblyIncludes(
5130 rhq.withoutObjCGCAttr().withoutObjCGLifetime())
John McCall22348732011-03-26 02:56:45 +00005131 && (lhptee->isVoidType() || rhptee->isVoidType()))
5132 ; // keep old
5133
John McCallf85e1932011-06-15 23:02:42 +00005134 // Treat lifetime mismatches as fatal.
5135 else if (lhq.getObjCLifetime() != rhq.getObjCLifetime())
5136 ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
5137
John McCall86c05f32011-02-01 00:10:29 +00005138 // For GCC compatibility, other qualifier mismatches are treated
5139 // as still compatible in C.
5140 else ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
5141 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005142
Mike Stumpeed9cac2009-02-19 03:04:26 +00005143 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or
5144 // incomplete type and the other is a pointer to a qualified or unqualified
Reid Spencer5f016e22007-07-11 17:01:13 +00005145 // version of void...
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005146 if (lhptee->isVoidType()) {
Chris Lattnerd805bec2008-04-02 06:59:01 +00005147 if (rhptee->isIncompleteOrObjectType())
Chris Lattner5cf216b2008-01-04 18:04:52 +00005148 return ConvTy;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005149
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005150 // As an extension, we allow cast to/from void* to function pointer.
Chris Lattnerd805bec2008-04-02 06:59:01 +00005151 assert(rhptee->isFunctionType());
John McCalle4be87e2011-01-31 23:13:11 +00005152 return Sema::FunctionVoidPointer;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005153 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005154
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005155 if (rhptee->isVoidType()) {
Chris Lattnerd805bec2008-04-02 06:59:01 +00005156 if (lhptee->isIncompleteOrObjectType())
Chris Lattner5cf216b2008-01-04 18:04:52 +00005157 return ConvTy;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005158
5159 // As an extension, we allow cast to/from void* to function pointer.
Chris Lattnerd805bec2008-04-02 06:59:01 +00005160 assert(lhptee->isFunctionType());
John McCalle4be87e2011-01-31 23:13:11 +00005161 return Sema::FunctionVoidPointer;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005162 }
John McCall86c05f32011-02-01 00:10:29 +00005163
Mike Stumpeed9cac2009-02-19 03:04:26 +00005164 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or
Reid Spencer5f016e22007-07-11 17:01:13 +00005165 // unqualified versions of compatible types, ...
John McCall86c05f32011-02-01 00:10:29 +00005166 QualType ltrans = QualType(lhptee, 0), rtrans = QualType(rhptee, 0);
5167 if (!S.Context.typesAreCompatible(ltrans, rtrans)) {
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005168 // Check if the pointee types are compatible ignoring the sign.
5169 // We explicitly check for char so that we catch "char" vs
5170 // "unsigned char" on systems where "char" is unsigned.
Chris Lattner6a2b9262009-10-17 20:33:28 +00005171 if (lhptee->isCharType())
John McCall86c05f32011-02-01 00:10:29 +00005172 ltrans = S.Context.UnsignedCharTy;
Douglas Gregorf6094622010-07-23 15:58:24 +00005173 else if (lhptee->hasSignedIntegerRepresentation())
John McCall86c05f32011-02-01 00:10:29 +00005174 ltrans = S.Context.getCorrespondingUnsignedType(ltrans);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005175
Chris Lattner6a2b9262009-10-17 20:33:28 +00005176 if (rhptee->isCharType())
John McCall86c05f32011-02-01 00:10:29 +00005177 rtrans = S.Context.UnsignedCharTy;
Douglas Gregorf6094622010-07-23 15:58:24 +00005178 else if (rhptee->hasSignedIntegerRepresentation())
John McCall86c05f32011-02-01 00:10:29 +00005179 rtrans = S.Context.getCorrespondingUnsignedType(rtrans);
Chris Lattner6a2b9262009-10-17 20:33:28 +00005180
John McCall86c05f32011-02-01 00:10:29 +00005181 if (ltrans == rtrans) {
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005182 // Types are compatible ignoring the sign. Qualifier incompatibility
5183 // takes priority over sign incompatibility because the sign
5184 // warning can be disabled.
John McCalle4be87e2011-01-31 23:13:11 +00005185 if (ConvTy != Sema::Compatible)
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005186 return ConvTy;
John McCall86c05f32011-02-01 00:10:29 +00005187
John McCalle4be87e2011-01-31 23:13:11 +00005188 return Sema::IncompatiblePointerSign;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005189 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005190
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00005191 // If we are a multi-level pointer, it's possible that our issue is simply
5192 // one of qualification - e.g. char ** -> const char ** is not allowed. If
5193 // the eventual target type is the same and the pointers have the same
5194 // level of indirection, this must be the issue.
John McCalle4be87e2011-01-31 23:13:11 +00005195 if (isa<PointerType>(lhptee) && isa<PointerType>(rhptee)) {
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00005196 do {
John McCall86c05f32011-02-01 00:10:29 +00005197 lhptee = cast<PointerType>(lhptee)->getPointeeType().getTypePtr();
5198 rhptee = cast<PointerType>(rhptee)->getPointeeType().getTypePtr();
John McCalle4be87e2011-01-31 23:13:11 +00005199 } while (isa<PointerType>(lhptee) && isa<PointerType>(rhptee));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005200
John McCall86c05f32011-02-01 00:10:29 +00005201 if (lhptee == rhptee)
John McCalle4be87e2011-01-31 23:13:11 +00005202 return Sema::IncompatibleNestedPointerQualifiers;
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00005203 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005204
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005205 // General pointer incompatibility takes priority over qualifiers.
John McCalle4be87e2011-01-31 23:13:11 +00005206 return Sema::IncompatiblePointer;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005207 }
Fariborz Jahanian53c81672011-10-05 00:05:34 +00005208 if (!S.getLangOptions().CPlusPlus &&
5209 S.IsNoReturnConversion(ltrans, rtrans, ltrans))
5210 return Sema::IncompatiblePointer;
Chris Lattner5cf216b2008-01-04 18:04:52 +00005211 return ConvTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00005212}
5213
John McCalle4be87e2011-01-31 23:13:11 +00005214/// checkBlockPointerTypesForAssignment - This routine determines whether two
Steve Naroff1c7d0672008-09-04 15:10:53 +00005215/// block pointer types are compatible or whether a block and normal pointer
5216/// are compatible. It is more restrict than comparing two function pointer
5217// types.
John McCalle4be87e2011-01-31 23:13:11 +00005218static Sema::AssignConvertType
Richard Trieu1da27a12011-09-06 20:21:22 +00005219checkBlockPointerTypesForAssignment(Sema &S, QualType LHSType,
5220 QualType RHSType) {
5221 assert(LHSType.isCanonical() && "LHS not canonicalized!");
5222 assert(RHSType.isCanonical() && "RHS not canonicalized!");
John McCalle4be87e2011-01-31 23:13:11 +00005223
Steve Naroff1c7d0672008-09-04 15:10:53 +00005224 QualType lhptee, rhptee;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005225
Steve Naroff1c7d0672008-09-04 15:10:53 +00005226 // get the "pointed to" type (ignoring qualifiers at the top level)
Richard Trieu1da27a12011-09-06 20:21:22 +00005227 lhptee = cast<BlockPointerType>(LHSType)->getPointeeType();
5228 rhptee = cast<BlockPointerType>(RHSType)->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005229
John McCalle4be87e2011-01-31 23:13:11 +00005230 // In C++, the types have to match exactly.
5231 if (S.getLangOptions().CPlusPlus)
5232 return Sema::IncompatibleBlockPointer;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005233
John McCalle4be87e2011-01-31 23:13:11 +00005234 Sema::AssignConvertType ConvTy = Sema::Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005235
Steve Naroff1c7d0672008-09-04 15:10:53 +00005236 // For blocks we enforce that qualifiers are identical.
John McCalle4be87e2011-01-31 23:13:11 +00005237 if (lhptee.getLocalQualifiers() != rhptee.getLocalQualifiers())
5238 ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005239
Richard Trieu1da27a12011-09-06 20:21:22 +00005240 if (!S.Context.typesAreBlockPointerCompatible(LHSType, RHSType))
John McCalle4be87e2011-01-31 23:13:11 +00005241 return Sema::IncompatibleBlockPointer;
5242
Steve Naroff1c7d0672008-09-04 15:10:53 +00005243 return ConvTy;
5244}
5245
John McCalle4be87e2011-01-31 23:13:11 +00005246/// checkObjCPointerTypesForAssignment - Compares two objective-c pointer types
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005247/// for assignment compatibility.
John McCalle4be87e2011-01-31 23:13:11 +00005248static Sema::AssignConvertType
Richard Trieu1da27a12011-09-06 20:21:22 +00005249checkObjCPointerTypesForAssignment(Sema &S, QualType LHSType,
5250 QualType RHSType) {
5251 assert(LHSType.isCanonical() && "LHS was not canonicalized!");
5252 assert(RHSType.isCanonical() && "RHS was not canonicalized!");
John McCalle4be87e2011-01-31 23:13:11 +00005253
Richard Trieu1da27a12011-09-06 20:21:22 +00005254 if (LHSType->isObjCBuiltinType()) {
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00005255 // Class is not compatible with ObjC object pointers.
Richard Trieu1da27a12011-09-06 20:21:22 +00005256 if (LHSType->isObjCClassType() && !RHSType->isObjCBuiltinType() &&
5257 !RHSType->isObjCQualifiedClassType())
John McCalle4be87e2011-01-31 23:13:11 +00005258 return Sema::IncompatiblePointer;
5259 return Sema::Compatible;
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00005260 }
Richard Trieu1da27a12011-09-06 20:21:22 +00005261 if (RHSType->isObjCBuiltinType()) {
Richard Trieu1da27a12011-09-06 20:21:22 +00005262 if (RHSType->isObjCClassType() && !LHSType->isObjCBuiltinType() &&
5263 !LHSType->isObjCQualifiedClassType())
Fariborz Jahanian412a4962011-09-15 20:40:18 +00005264 return Sema::IncompatiblePointer;
John McCalle4be87e2011-01-31 23:13:11 +00005265 return Sema::Compatible;
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00005266 }
Richard Trieu1da27a12011-09-06 20:21:22 +00005267 QualType lhptee = LHSType->getAs<ObjCObjectPointerType>()->getPointeeType();
5268 QualType rhptee = RHSType->getAs<ObjCObjectPointerType>()->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005269
John McCalle4be87e2011-01-31 23:13:11 +00005270 if (!lhptee.isAtLeastAsQualifiedAs(rhptee))
5271 return Sema::CompatiblePointerDiscardsQualifiers;
5272
Richard Trieu1da27a12011-09-06 20:21:22 +00005273 if (S.Context.typesAreCompatible(LHSType, RHSType))
John McCalle4be87e2011-01-31 23:13:11 +00005274 return Sema::Compatible;
Richard Trieu1da27a12011-09-06 20:21:22 +00005275 if (LHSType->isObjCQualifiedIdType() || RHSType->isObjCQualifiedIdType())
John McCalle4be87e2011-01-31 23:13:11 +00005276 return Sema::IncompatibleObjCQualifiedId;
5277 return Sema::IncompatiblePointer;
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005278}
5279
John McCall1c23e912010-11-16 02:32:08 +00005280Sema::AssignConvertType
Douglas Gregorb608b982011-01-28 02:26:04 +00005281Sema::CheckAssignmentConstraints(SourceLocation Loc,
Richard Trieu1da27a12011-09-06 20:21:22 +00005282 QualType LHSType, QualType RHSType) {
John McCall1c23e912010-11-16 02:32:08 +00005283 // Fake up an opaque expression. We don't actually care about what
5284 // cast operations are required, so if CheckAssignmentConstraints
5285 // adds casts to this they'll be wasted, but fortunately that doesn't
5286 // usually happen on valid code.
Richard Trieu1da27a12011-09-06 20:21:22 +00005287 OpaqueValueExpr RHSExpr(Loc, RHSType, VK_RValue);
5288 ExprResult RHSPtr = &RHSExpr;
John McCall1c23e912010-11-16 02:32:08 +00005289 CastKind K = CK_Invalid;
5290
Richard Trieu1da27a12011-09-06 20:21:22 +00005291 return CheckAssignmentConstraints(LHSType, RHSPtr, K);
John McCall1c23e912010-11-16 02:32:08 +00005292}
5293
Mike Stumpeed9cac2009-02-19 03:04:26 +00005294/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently
5295/// has code to accommodate several GCC extensions when type checking
Reid Spencer5f016e22007-07-11 17:01:13 +00005296/// pointers. Here are some objectionable examples that GCC considers warnings:
5297///
5298/// int a, *pint;
5299/// short *pshort;
5300/// struct foo *pfoo;
5301///
5302/// pint = pshort; // warning: assignment from incompatible pointer type
5303/// a = pint; // warning: assignment makes integer from pointer without a cast
5304/// pint = a; // warning: assignment makes pointer from integer without a cast
5305/// pint = pfoo; // warning: assignment from incompatible pointer type
5306///
5307/// As a result, the code for dealing with pointers is more complex than the
Mike Stumpeed9cac2009-02-19 03:04:26 +00005308/// C99 spec dictates.
Reid Spencer5f016e22007-07-11 17:01:13 +00005309///
John McCalldaa8e4e2010-11-15 09:13:47 +00005310/// Sets 'Kind' for any result kind except Incompatible.
Chris Lattner5cf216b2008-01-04 18:04:52 +00005311Sema::AssignConvertType
Richard Trieufacef2e2011-09-06 20:30:53 +00005312Sema::CheckAssignmentConstraints(QualType LHSType, ExprResult &RHS,
John McCalldaa8e4e2010-11-15 09:13:47 +00005313 CastKind &Kind) {
Richard Trieufacef2e2011-09-06 20:30:53 +00005314 QualType RHSType = RHS.get()->getType();
5315 QualType OrigLHSType = LHSType;
John McCall1c23e912010-11-16 02:32:08 +00005316
Chris Lattnerfc144e22008-01-04 23:18:45 +00005317 // Get canonical types. We're not formatting these types, just comparing
5318 // them.
Richard Trieufacef2e2011-09-06 20:30:53 +00005319 LHSType = Context.getCanonicalType(LHSType).getUnqualifiedType();
5320 RHSType = Context.getCanonicalType(RHSType).getUnqualifiedType();
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005321
Eli Friedmanb001de72011-10-06 23:00:33 +00005322 // We can't do assignment from/to atomics yet.
5323 if (LHSType->isAtomicType())
5324 return Incompatible;
5325
John McCallb6cfa242011-01-31 22:28:28 +00005326 // Common case: no conversion required.
Richard Trieufacef2e2011-09-06 20:30:53 +00005327 if (LHSType == RHSType) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005328 Kind = CK_NoOp;
John McCalldaa8e4e2010-11-15 09:13:47 +00005329 return Compatible;
David Chisnall0f436562009-08-17 16:35:33 +00005330 }
5331
Douglas Gregor9d293df2008-10-28 00:22:11 +00005332 // If the left-hand side is a reference type, then we are in a
5333 // (rare!) case where we've allowed the use of references in C,
5334 // e.g., as a parameter type in a built-in function. In this case,
5335 // just make sure that the type referenced is compatible with the
5336 // right-hand side type. The caller is responsible for adjusting
Richard Trieufacef2e2011-09-06 20:30:53 +00005337 // LHSType so that the resulting expression does not have reference
Douglas Gregor9d293df2008-10-28 00:22:11 +00005338 // type.
Richard Trieufacef2e2011-09-06 20:30:53 +00005339 if (const ReferenceType *LHSTypeRef = LHSType->getAs<ReferenceType>()) {
5340 if (Context.typesAreCompatible(LHSTypeRef->getPointeeType(), RHSType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005341 Kind = CK_LValueBitCast;
Anders Carlsson793680e2007-10-12 23:56:29 +00005342 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005343 }
Chris Lattnerfc144e22008-01-04 23:18:45 +00005344 return Incompatible;
Fariborz Jahanian411f3732007-12-19 17:45:58 +00005345 }
John McCallb6cfa242011-01-31 22:28:28 +00005346
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005347 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type
5348 // to the same ExtVector type.
Richard Trieufacef2e2011-09-06 20:30:53 +00005349 if (LHSType->isExtVectorType()) {
5350 if (RHSType->isExtVectorType())
John McCalldaa8e4e2010-11-15 09:13:47 +00005351 return Incompatible;
Richard Trieufacef2e2011-09-06 20:30:53 +00005352 if (RHSType->isArithmeticType()) {
John McCall1c23e912010-11-16 02:32:08 +00005353 // CK_VectorSplat does T -> vector T, so first cast to the
5354 // element type.
Richard Trieufacef2e2011-09-06 20:30:53 +00005355 QualType elType = cast<ExtVectorType>(LHSType)->getElementType();
5356 if (elType != RHSType) {
John McCalla180f042011-10-06 23:25:11 +00005357 Kind = PrepareScalarCast(RHS, elType);
Richard Trieufacef2e2011-09-06 20:30:53 +00005358 RHS = ImpCastExprToType(RHS.take(), elType, Kind);
John McCall1c23e912010-11-16 02:32:08 +00005359 }
5360 Kind = CK_VectorSplat;
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005361 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005362 }
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005363 }
Mike Stump1eb44332009-09-09 15:08:12 +00005364
John McCallb6cfa242011-01-31 22:28:28 +00005365 // Conversions to or from vector type.
Richard Trieufacef2e2011-09-06 20:30:53 +00005366 if (LHSType->isVectorType() || RHSType->isVectorType()) {
5367 if (LHSType->isVectorType() && RHSType->isVectorType()) {
Bob Wilsonde3deea2010-12-02 00:25:15 +00005368 // Allow assignments of an AltiVec vector type to an equivalent GCC
5369 // vector type and vice versa
Richard Trieufacef2e2011-09-06 20:30:53 +00005370 if (Context.areCompatibleVectorTypes(LHSType, RHSType)) {
Bob Wilsonde3deea2010-12-02 00:25:15 +00005371 Kind = CK_BitCast;
5372 return Compatible;
5373 }
5374
Douglas Gregor255210e2010-08-06 10:14:59 +00005375 // If we are allowing lax vector conversions, and LHS and RHS are both
5376 // vectors, the total size only needs to be the same. This is a bitcast;
5377 // no bits are changed but the result type is different.
5378 if (getLangOptions().LaxVectorConversions &&
Richard Trieufacef2e2011-09-06 20:30:53 +00005379 (Context.getTypeSize(LHSType) == Context.getTypeSize(RHSType))) {
John McCall0c6d28d2010-11-15 10:08:00 +00005380 Kind = CK_BitCast;
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00005381 return IncompatibleVectors;
John McCalldaa8e4e2010-11-15 09:13:47 +00005382 }
Chris Lattnere8b3e962008-01-04 23:32:24 +00005383 }
5384 return Incompatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005385 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005386
John McCallb6cfa242011-01-31 22:28:28 +00005387 // Arithmetic conversions.
Richard Trieufacef2e2011-09-06 20:30:53 +00005388 if (LHSType->isArithmeticType() && RHSType->isArithmeticType() &&
5389 !(getLangOptions().CPlusPlus && LHSType->isEnumeralType())) {
John McCalla180f042011-10-06 23:25:11 +00005390 Kind = PrepareScalarCast(RHS, LHSType);
Reid Spencer5f016e22007-07-11 17:01:13 +00005391 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005392 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005393
John McCallb6cfa242011-01-31 22:28:28 +00005394 // Conversions to normal pointers.
Richard Trieufacef2e2011-09-06 20:30:53 +00005395 if (const PointerType *LHSPointer = dyn_cast<PointerType>(LHSType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005396 // U* -> T*
Richard Trieufacef2e2011-09-06 20:30:53 +00005397 if (isa<PointerType>(RHSType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005398 Kind = CK_BitCast;
Richard Trieufacef2e2011-09-06 20:30:53 +00005399 return checkPointerTypesForAssignment(*this, LHSType, RHSType);
John McCalldaa8e4e2010-11-15 09:13:47 +00005400 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005401
John McCallb6cfa242011-01-31 22:28:28 +00005402 // int -> T*
Richard Trieufacef2e2011-09-06 20:30:53 +00005403 if (RHSType->isIntegerType()) {
John McCallb6cfa242011-01-31 22:28:28 +00005404 Kind = CK_IntegralToPointer; // FIXME: null?
5405 return IntToPointer;
Steve Naroff14108da2009-07-10 23:34:53 +00005406 }
John McCallb6cfa242011-01-31 22:28:28 +00005407
5408 // C pointers are not compatible with ObjC object pointers,
5409 // with two exceptions:
Richard Trieufacef2e2011-09-06 20:30:53 +00005410 if (isa<ObjCObjectPointerType>(RHSType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005411 // - conversions to void*
Richard Trieufacef2e2011-09-06 20:30:53 +00005412 if (LHSPointer->getPointeeType()->isVoidType()) {
John McCall1d9b3b22011-09-09 05:25:32 +00005413 Kind = CK_BitCast;
John McCallb6cfa242011-01-31 22:28:28 +00005414 return Compatible;
5415 }
5416
5417 // - conversions from 'Class' to the redefinition type
Richard Trieufacef2e2011-09-06 20:30:53 +00005418 if (RHSType->isObjCClassType() &&
5419 Context.hasSameType(LHSType,
Douglas Gregor01a4cf12011-08-11 20:58:55 +00005420 Context.getObjCClassRedefinitionType())) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005421 Kind = CK_BitCast;
Douglas Gregor63a94902008-11-27 00:44:28 +00005422 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005423 }
Douglas Gregorc737acb2011-09-27 16:10:05 +00005424
John McCallb6cfa242011-01-31 22:28:28 +00005425 Kind = CK_BitCast;
5426 return IncompatiblePointer;
5427 }
5428
5429 // U^ -> void*
Richard Trieufacef2e2011-09-06 20:30:53 +00005430 if (RHSType->getAs<BlockPointerType>()) {
5431 if (LHSPointer->getPointeeType()->isVoidType()) {
John McCallb6cfa242011-01-31 22:28:28 +00005432 Kind = CK_BitCast;
Steve Naroffb4406862008-09-29 18:10:17 +00005433 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005434 }
Steve Naroffb4406862008-09-29 18:10:17 +00005435 }
John McCallb6cfa242011-01-31 22:28:28 +00005436
Steve Naroff1c7d0672008-09-04 15:10:53 +00005437 return Incompatible;
5438 }
5439
John McCallb6cfa242011-01-31 22:28:28 +00005440 // Conversions to block pointers.
Richard Trieufacef2e2011-09-06 20:30:53 +00005441 if (isa<BlockPointerType>(LHSType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005442 // U^ -> T^
Richard Trieufacef2e2011-09-06 20:30:53 +00005443 if (RHSType->isBlockPointerType()) {
John McCall1d9b3b22011-09-09 05:25:32 +00005444 Kind = CK_BitCast;
Richard Trieufacef2e2011-09-06 20:30:53 +00005445 return checkBlockPointerTypesForAssignment(*this, LHSType, RHSType);
John McCallb6cfa242011-01-31 22:28:28 +00005446 }
5447
5448 // int or null -> T^
Richard Trieufacef2e2011-09-06 20:30:53 +00005449 if (RHSType->isIntegerType()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005450 Kind = CK_IntegralToPointer; // FIXME: null
Eli Friedmand8f4f432009-02-25 04:20:42 +00005451 return IntToBlockPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00005452 }
5453
John McCallb6cfa242011-01-31 22:28:28 +00005454 // id -> T^
Richard Trieufacef2e2011-09-06 20:30:53 +00005455 if (getLangOptions().ObjC1 && RHSType->isObjCIdType()) {
John McCallb6cfa242011-01-31 22:28:28 +00005456 Kind = CK_AnyPointerToBlockPointerCast;
Steve Naroffb4406862008-09-29 18:10:17 +00005457 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00005458 }
Steve Naroffb4406862008-09-29 18:10:17 +00005459
John McCallb6cfa242011-01-31 22:28:28 +00005460 // void* -> T^
Richard Trieufacef2e2011-09-06 20:30:53 +00005461 if (const PointerType *RHSPT = RHSType->getAs<PointerType>())
John McCallb6cfa242011-01-31 22:28:28 +00005462 if (RHSPT->getPointeeType()->isVoidType()) {
5463 Kind = CK_AnyPointerToBlockPointerCast;
Douglas Gregor63a94902008-11-27 00:44:28 +00005464 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00005465 }
John McCalldaa8e4e2010-11-15 09:13:47 +00005466
Chris Lattnerfc144e22008-01-04 23:18:45 +00005467 return Incompatible;
5468 }
5469
John McCallb6cfa242011-01-31 22:28:28 +00005470 // Conversions to Objective-C pointers.
Richard Trieufacef2e2011-09-06 20:30:53 +00005471 if (isa<ObjCObjectPointerType>(LHSType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005472 // A* -> B*
Richard Trieufacef2e2011-09-06 20:30:53 +00005473 if (RHSType->isObjCObjectPointerType()) {
John McCallb6cfa242011-01-31 22:28:28 +00005474 Kind = CK_BitCast;
Fariborz Jahanian04e5a252011-07-07 18:55:47 +00005475 Sema::AssignConvertType result =
Richard Trieufacef2e2011-09-06 20:30:53 +00005476 checkObjCPointerTypesForAssignment(*this, LHSType, RHSType);
Fariborz Jahanian04e5a252011-07-07 18:55:47 +00005477 if (getLangOptions().ObjCAutoRefCount &&
5478 result == Compatible &&
Richard Trieufacef2e2011-09-06 20:30:53 +00005479 !CheckObjCARCUnavailableWeakConversion(OrigLHSType, RHSType))
Fariborz Jahanian7a084ec2011-07-07 23:04:17 +00005480 result = IncompatibleObjCWeakRef;
Fariborz Jahanian04e5a252011-07-07 18:55:47 +00005481 return result;
John McCallb6cfa242011-01-31 22:28:28 +00005482 }
5483
5484 // int or null -> A*
Richard Trieufacef2e2011-09-06 20:30:53 +00005485 if (RHSType->isIntegerType()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005486 Kind = CK_IntegralToPointer; // FIXME: null
Steve Naroff14108da2009-07-10 23:34:53 +00005487 return IntToPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00005488 }
5489
John McCallb6cfa242011-01-31 22:28:28 +00005490 // In general, C pointers are not compatible with ObjC object pointers,
5491 // with two exceptions:
Richard Trieufacef2e2011-09-06 20:30:53 +00005492 if (isa<PointerType>(RHSType)) {
John McCall1d9b3b22011-09-09 05:25:32 +00005493 Kind = CK_CPointerToObjCPointerCast;
5494
John McCallb6cfa242011-01-31 22:28:28 +00005495 // - conversions from 'void*'
Richard Trieufacef2e2011-09-06 20:30:53 +00005496 if (RHSType->isVoidPointerType()) {
Steve Naroff67ef8ea2009-07-20 17:56:53 +00005497 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00005498 }
5499
5500 // - conversions to 'Class' from its redefinition type
Richard Trieufacef2e2011-09-06 20:30:53 +00005501 if (LHSType->isObjCClassType() &&
5502 Context.hasSameType(RHSType,
Douglas Gregor01a4cf12011-08-11 20:58:55 +00005503 Context.getObjCClassRedefinitionType())) {
John McCallb6cfa242011-01-31 22:28:28 +00005504 return Compatible;
5505 }
5506
Steve Naroff67ef8ea2009-07-20 17:56:53 +00005507 return IncompatiblePointer;
Steve Naroff14108da2009-07-10 23:34:53 +00005508 }
John McCallb6cfa242011-01-31 22:28:28 +00005509
5510 // T^ -> A*
Richard Trieufacef2e2011-09-06 20:30:53 +00005511 if (RHSType->isBlockPointerType()) {
John McCalldc05b112011-09-10 01:16:55 +00005512 maybeExtendBlockObject(*this, RHS);
John McCall1d9b3b22011-09-09 05:25:32 +00005513 Kind = CK_BlockPointerToObjCPointerCast;
Steve Naroff14108da2009-07-10 23:34:53 +00005514 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00005515 }
5516
Steve Naroff14108da2009-07-10 23:34:53 +00005517 return Incompatible;
5518 }
John McCallb6cfa242011-01-31 22:28:28 +00005519
5520 // Conversions from pointers that are not covered by the above.
Richard Trieufacef2e2011-09-06 20:30:53 +00005521 if (isa<PointerType>(RHSType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005522 // T* -> _Bool
Richard Trieufacef2e2011-09-06 20:30:53 +00005523 if (LHSType == Context.BoolTy) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005524 Kind = CK_PointerToBoolean;
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005525 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005526 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005527
John McCallb6cfa242011-01-31 22:28:28 +00005528 // T* -> int
Richard Trieufacef2e2011-09-06 20:30:53 +00005529 if (LHSType->isIntegerType()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005530 Kind = CK_PointerToIntegral;
Chris Lattnerb7b61152008-01-04 18:22:42 +00005531 return PointerToInt;
John McCalldaa8e4e2010-11-15 09:13:47 +00005532 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005533
Chris Lattnerfc144e22008-01-04 23:18:45 +00005534 return Incompatible;
Chris Lattnerfc144e22008-01-04 23:18:45 +00005535 }
John McCallb6cfa242011-01-31 22:28:28 +00005536
5537 // Conversions from Objective-C pointers that are not covered by the above.
Richard Trieufacef2e2011-09-06 20:30:53 +00005538 if (isa<ObjCObjectPointerType>(RHSType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005539 // T* -> _Bool
Richard Trieufacef2e2011-09-06 20:30:53 +00005540 if (LHSType == Context.BoolTy) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005541 Kind = CK_PointerToBoolean;
Steve Naroff14108da2009-07-10 23:34:53 +00005542 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005543 }
Steve Naroff14108da2009-07-10 23:34:53 +00005544
John McCallb6cfa242011-01-31 22:28:28 +00005545 // T* -> int
Richard Trieufacef2e2011-09-06 20:30:53 +00005546 if (LHSType->isIntegerType()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005547 Kind = CK_PointerToIntegral;
Steve Naroff14108da2009-07-10 23:34:53 +00005548 return PointerToInt;
John McCalldaa8e4e2010-11-15 09:13:47 +00005549 }
5550
Steve Naroff14108da2009-07-10 23:34:53 +00005551 return Incompatible;
5552 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005553
John McCallb6cfa242011-01-31 22:28:28 +00005554 // struct A -> struct B
Richard Trieufacef2e2011-09-06 20:30:53 +00005555 if (isa<TagType>(LHSType) && isa<TagType>(RHSType)) {
5556 if (Context.typesAreCompatible(LHSType, RHSType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005557 Kind = CK_NoOp;
Reid Spencer5f016e22007-07-11 17:01:13 +00005558 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005559 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005560 }
John McCallb6cfa242011-01-31 22:28:28 +00005561
Reid Spencer5f016e22007-07-11 17:01:13 +00005562 return Incompatible;
5563}
5564
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005565/// \brief Constructs a transparent union from an expression that is
5566/// used to initialize the transparent union.
Richard Trieu67e29332011-08-02 04:35:43 +00005567static void ConstructTransparentUnion(Sema &S, ASTContext &C,
5568 ExprResult &EResult, QualType UnionType,
5569 FieldDecl *Field) {
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005570 // Build an initializer list that designates the appropriate member
5571 // of the transparent union.
John Wiegley429bb272011-04-08 18:41:53 +00005572 Expr *E = EResult.take();
Ted Kremenek709210f2010-04-13 23:39:13 +00005573 InitListExpr *Initializer = new (C) InitListExpr(C, SourceLocation(),
Ted Kremenekba7bc552010-02-19 01:50:18 +00005574 &E, 1,
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005575 SourceLocation());
5576 Initializer->setType(UnionType);
5577 Initializer->setInitializedFieldInUnion(Field);
5578
5579 // Build a compound literal constructing a value of the transparent
5580 // union type from this initializer list.
John McCall42f56b52010-01-18 19:35:47 +00005581 TypeSourceInfo *unionTInfo = C.getTrivialTypeSourceInfo(UnionType);
John Wiegley429bb272011-04-08 18:41:53 +00005582 EResult = S.Owned(
5583 new (C) CompoundLiteralExpr(SourceLocation(), unionTInfo, UnionType,
5584 VK_RValue, Initializer, false));
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005585}
5586
5587Sema::AssignConvertType
Richard Trieu67e29332011-08-02 04:35:43 +00005588Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType,
Richard Trieuf7720da2011-09-06 20:40:12 +00005589 ExprResult &RHS) {
5590 QualType RHSType = RHS.get()->getType();
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005591
Mike Stump1eb44332009-09-09 15:08:12 +00005592 // If the ArgType is a Union type, we want to handle a potential
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005593 // transparent_union GCC extension.
5594 const RecordType *UT = ArgType->getAsUnionType();
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00005595 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>())
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005596 return Incompatible;
5597
5598 // The field to initialize within the transparent union.
5599 RecordDecl *UD = UT->getDecl();
5600 FieldDecl *InitField = 0;
5601 // It's compatible if the expression matches any of the fields.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00005602 for (RecordDecl::field_iterator it = UD->field_begin(),
5603 itend = UD->field_end();
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005604 it != itend; ++it) {
5605 if (it->getType()->isPointerType()) {
5606 // If the transparent union contains a pointer type, we allow:
5607 // 1) void pointer
5608 // 2) null pointer constant
Richard Trieuf7720da2011-09-06 20:40:12 +00005609 if (RHSType->isPointerType())
John McCall1d9b3b22011-09-09 05:25:32 +00005610 if (RHSType->castAs<PointerType>()->getPointeeType()->isVoidType()) {
Richard Trieuf7720da2011-09-06 20:40:12 +00005611 RHS = ImpCastExprToType(RHS.take(), it->getType(), CK_BitCast);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005612 InitField = *it;
5613 break;
5614 }
Mike Stump1eb44332009-09-09 15:08:12 +00005615
Richard Trieuf7720da2011-09-06 20:40:12 +00005616 if (RHS.get()->isNullPointerConstant(Context,
5617 Expr::NPC_ValueDependentIsNull)) {
5618 RHS = ImpCastExprToType(RHS.take(), it->getType(),
5619 CK_NullToPointer);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005620 InitField = *it;
5621 break;
5622 }
5623 }
5624
John McCalldaa8e4e2010-11-15 09:13:47 +00005625 CastKind Kind = CK_Invalid;
Richard Trieuf7720da2011-09-06 20:40:12 +00005626 if (CheckAssignmentConstraints(it->getType(), RHS, Kind)
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005627 == Compatible) {
Richard Trieuf7720da2011-09-06 20:40:12 +00005628 RHS = ImpCastExprToType(RHS.take(), it->getType(), Kind);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005629 InitField = *it;
5630 break;
5631 }
5632 }
5633
5634 if (!InitField)
5635 return Incompatible;
5636
Richard Trieuf7720da2011-09-06 20:40:12 +00005637 ConstructTransparentUnion(*this, Context, RHS, ArgType, InitField);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005638 return Compatible;
5639}
5640
Chris Lattner5cf216b2008-01-04 18:04:52 +00005641Sema::AssignConvertType
Sebastian Redl14b0c192011-09-24 17:48:00 +00005642Sema::CheckSingleAssignmentConstraints(QualType LHSType, ExprResult &RHS,
5643 bool Diagnose) {
Douglas Gregor98cd5992008-10-21 23:43:52 +00005644 if (getLangOptions().CPlusPlus) {
Eli Friedmanb001de72011-10-06 23:00:33 +00005645 if (!LHSType->isRecordType() && !LHSType->isAtomicType()) {
Douglas Gregor98cd5992008-10-21 23:43:52 +00005646 // C++ 5.17p3: If the left operand is not of class type, the
5647 // expression is implicitly converted (C++ 4) to the
5648 // cv-unqualified type of the left operand.
Sebastian Redl091fffe2011-10-16 18:19:06 +00005649 ExprResult Res;
5650 if (Diagnose) {
5651 Res = PerformImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
5652 AA_Assigning);
5653 } else {
5654 ImplicitConversionSequence ICS =
5655 TryImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
5656 /*SuppressUserConversions=*/false,
5657 /*AllowExplicit=*/false,
5658 /*InOverloadResolution=*/false,
5659 /*CStyle=*/false,
5660 /*AllowObjCWritebackConversion=*/false);
5661 if (ICS.isFailure())
5662 return Incompatible;
5663 Res = PerformImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
5664 ICS, AA_Assigning);
5665 }
John Wiegley429bb272011-04-08 18:41:53 +00005666 if (Res.isInvalid())
Douglas Gregor98cd5992008-10-21 23:43:52 +00005667 return Incompatible;
Fariborz Jahanian7a084ec2011-07-07 23:04:17 +00005668 Sema::AssignConvertType result = Compatible;
5669 if (getLangOptions().ObjCAutoRefCount &&
Richard Trieuf7720da2011-09-06 20:40:12 +00005670 !CheckObjCARCUnavailableWeakConversion(LHSType,
5671 RHS.get()->getType()))
Fariborz Jahanian7a084ec2011-07-07 23:04:17 +00005672 result = IncompatibleObjCWeakRef;
Richard Trieuf7720da2011-09-06 20:40:12 +00005673 RHS = move(Res);
Fariborz Jahanian7a084ec2011-07-07 23:04:17 +00005674 return result;
Douglas Gregor98cd5992008-10-21 23:43:52 +00005675 }
5676
5677 // FIXME: Currently, we fall through and treat C++ classes like C
5678 // structures.
Eli Friedmanb001de72011-10-06 23:00:33 +00005679 // FIXME: We also fall through for atomics; not sure what should
5680 // happen there, though.
Sebastian Redl14b0c192011-09-24 17:48:00 +00005681 }
Douglas Gregor98cd5992008-10-21 23:43:52 +00005682
Steve Naroff529a4ad2007-11-27 17:58:44 +00005683 // C99 6.5.16.1p1: the left operand is a pointer and the right is
5684 // a null pointer constant.
Richard Trieuf7720da2011-09-06 20:40:12 +00005685 if ((LHSType->isPointerType() ||
5686 LHSType->isObjCObjectPointerType() ||
5687 LHSType->isBlockPointerType())
5688 && RHS.get()->isNullPointerConstant(Context,
5689 Expr::NPC_ValueDependentIsNull)) {
5690 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_NullToPointer);
Steve Naroff529a4ad2007-11-27 17:58:44 +00005691 return Compatible;
5692 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005693
Chris Lattner943140e2007-10-16 02:55:40 +00005694 // This check seems unnatural, however it is necessary to ensure the proper
Steve Naroff90045e82007-07-13 23:32:42 +00005695 // conversion of functions/arrays. If the conversion were done for all
Douglas Gregor02a24ee2009-11-03 16:56:39 +00005696 // DeclExpr's (created by ActOnIdExpression), it would mess up the unary
Nick Lewyckyc133e9e2010-08-05 06:27:49 +00005697 // expressions that suppress this implicit conversion (&, sizeof).
Chris Lattner943140e2007-10-16 02:55:40 +00005698 //
Mike Stumpeed9cac2009-02-19 03:04:26 +00005699 // Suppress this for references: C++ 8.5.3p5.
Richard Trieuf7720da2011-09-06 20:40:12 +00005700 if (!LHSType->isReferenceType()) {
5701 RHS = DefaultFunctionArrayLvalueConversion(RHS.take());
5702 if (RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00005703 return Incompatible;
5704 }
Steve Narofff1120de2007-08-24 22:33:52 +00005705
John McCalldaa8e4e2010-11-15 09:13:47 +00005706 CastKind Kind = CK_Invalid;
Chris Lattner5cf216b2008-01-04 18:04:52 +00005707 Sema::AssignConvertType result =
Richard Trieuf7720da2011-09-06 20:40:12 +00005708 CheckAssignmentConstraints(LHSType, RHS, Kind);
Mike Stumpeed9cac2009-02-19 03:04:26 +00005709
Steve Narofff1120de2007-08-24 22:33:52 +00005710 // C99 6.5.16.1p2: The value of the right operand is converted to the
5711 // type of the assignment expression.
Douglas Gregor9d293df2008-10-28 00:22:11 +00005712 // CheckAssignmentConstraints allows the left-hand side to be a reference,
5713 // so that we can use references in built-in functions even in C.
5714 // The getNonReferenceType() call makes sure that the resulting expression
5715 // does not have reference type.
Richard Trieuf7720da2011-09-06 20:40:12 +00005716 if (result != Incompatible && RHS.get()->getType() != LHSType)
5717 RHS = ImpCastExprToType(RHS.take(),
5718 LHSType.getNonLValueExprType(Context), Kind);
Steve Narofff1120de2007-08-24 22:33:52 +00005719 return result;
Steve Naroff90045e82007-07-13 23:32:42 +00005720}
5721
Richard Trieuf7720da2011-09-06 20:40:12 +00005722QualType Sema::InvalidOperands(SourceLocation Loc, ExprResult &LHS,
5723 ExprResult &RHS) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00005724 Diag(Loc, diag::err_typecheck_invalid_operands)
Richard Trieuf7720da2011-09-06 20:40:12 +00005725 << LHS.get()->getType() << RHS.get()->getType()
5726 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Chris Lattnerca5eede2007-12-12 05:47:28 +00005727 return QualType();
Reid Spencer5f016e22007-07-11 17:01:13 +00005728}
5729
Richard Trieu08062aa2011-09-06 21:01:04 +00005730QualType Sema::CheckVectorOperands(ExprResult &LHS, ExprResult &RHS,
Richard Trieuccd891a2011-09-09 01:45:06 +00005731 SourceLocation Loc, bool IsCompAssign) {
Richard Smith9c129f82011-10-28 03:31:48 +00005732 if (!IsCompAssign) {
5733 LHS = DefaultFunctionArrayLvalueConversion(LHS.take());
5734 if (LHS.isInvalid())
5735 return QualType();
5736 }
5737 RHS = DefaultFunctionArrayLvalueConversion(RHS.take());
5738 if (RHS.isInvalid())
5739 return QualType();
5740
Mike Stumpeed9cac2009-02-19 03:04:26 +00005741 // For conversion purposes, we ignore any qualifiers.
Nate Begeman1330b0e2008-04-04 01:30:25 +00005742 // For example, "const float" and "float" are equivalent.
Richard Trieu08062aa2011-09-06 21:01:04 +00005743 QualType LHSType =
5744 Context.getCanonicalType(LHS.get()->getType()).getUnqualifiedType();
5745 QualType RHSType =
5746 Context.getCanonicalType(RHS.get()->getType()).getUnqualifiedType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005747
Nate Begemanbe2341d2008-07-14 18:02:46 +00005748 // If the vector types are identical, return.
Richard Trieu08062aa2011-09-06 21:01:04 +00005749 if (LHSType == RHSType)
5750 return LHSType;
Nate Begeman4119d1a2007-12-30 02:59:45 +00005751
Douglas Gregor255210e2010-08-06 10:14:59 +00005752 // Handle the case of equivalent AltiVec and GCC vector types
Richard Trieu08062aa2011-09-06 21:01:04 +00005753 if (LHSType->isVectorType() && RHSType->isVectorType() &&
5754 Context.areCompatibleVectorTypes(LHSType, RHSType)) {
5755 if (LHSType->isExtVectorType()) {
5756 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
5757 return LHSType;
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005758 }
5759
Richard Trieuccd891a2011-09-09 01:45:06 +00005760 if (!IsCompAssign)
Richard Trieu08062aa2011-09-06 21:01:04 +00005761 LHS = ImpCastExprToType(LHS.take(), RHSType, CK_BitCast);
5762 return RHSType;
Douglas Gregor255210e2010-08-06 10:14:59 +00005763 }
5764
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005765 if (getLangOptions().LaxVectorConversions &&
Richard Trieu08062aa2011-09-06 21:01:04 +00005766 Context.getTypeSize(LHSType) == Context.getTypeSize(RHSType)) {
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005767 // If we are allowing lax vector conversions, and LHS and RHS are both
5768 // vectors, the total size only needs to be the same. This is a
5769 // bitcast; no bits are changed but the result type is different.
5770 // FIXME: Should we really be allowing this?
Richard Trieu08062aa2011-09-06 21:01:04 +00005771 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
5772 return LHSType;
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005773 }
5774
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005775 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can
5776 // swap back (so that we don't reverse the inputs to a subtract, for instance.
5777 bool swapped = false;
Richard Trieuccd891a2011-09-09 01:45:06 +00005778 if (RHSType->isExtVectorType() && !IsCompAssign) {
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005779 swapped = true;
Richard Trieu08062aa2011-09-06 21:01:04 +00005780 std::swap(RHS, LHS);
5781 std::swap(RHSType, LHSType);
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005782 }
Mike Stump1eb44332009-09-09 15:08:12 +00005783
Nate Begemandde25982009-06-28 19:12:57 +00005784 // Handle the case of an ext vector and scalar.
Richard Trieu08062aa2011-09-06 21:01:04 +00005785 if (const ExtVectorType *LV = LHSType->getAs<ExtVectorType>()) {
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005786 QualType EltTy = LV->getElementType();
Richard Trieu08062aa2011-09-06 21:01:04 +00005787 if (EltTy->isIntegralType(Context) && RHSType->isIntegralType(Context)) {
5788 int order = Context.getIntegerTypeOrder(EltTy, RHSType);
John McCalldaa8e4e2010-11-15 09:13:47 +00005789 if (order > 0)
Richard Trieu08062aa2011-09-06 21:01:04 +00005790 RHS = ImpCastExprToType(RHS.take(), EltTy, CK_IntegralCast);
John McCalldaa8e4e2010-11-15 09:13:47 +00005791 if (order >= 0) {
Richard Trieu08062aa2011-09-06 21:01:04 +00005792 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_VectorSplat);
5793 if (swapped) std::swap(RHS, LHS);
5794 return LHSType;
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005795 }
5796 }
Richard Trieu08062aa2011-09-06 21:01:04 +00005797 if (EltTy->isRealFloatingType() && RHSType->isScalarType() &&
5798 RHSType->isRealFloatingType()) {
5799 int order = Context.getFloatingTypeOrder(EltTy, RHSType);
John McCalldaa8e4e2010-11-15 09:13:47 +00005800 if (order > 0)
Richard Trieu08062aa2011-09-06 21:01:04 +00005801 RHS = ImpCastExprToType(RHS.take(), EltTy, CK_FloatingCast);
John McCalldaa8e4e2010-11-15 09:13:47 +00005802 if (order >= 0) {
Richard Trieu08062aa2011-09-06 21:01:04 +00005803 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_VectorSplat);
5804 if (swapped) std::swap(RHS, LHS);
5805 return LHSType;
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005806 }
Nate Begeman4119d1a2007-12-30 02:59:45 +00005807 }
5808 }
Mike Stump1eb44332009-09-09 15:08:12 +00005809
Nate Begemandde25982009-06-28 19:12:57 +00005810 // Vectors of different size or scalar and non-ext-vector are errors.
Richard Trieu08062aa2011-09-06 21:01:04 +00005811 if (swapped) std::swap(RHS, LHS);
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00005812 Diag(Loc, diag::err_typecheck_vector_not_convertable)
Richard Trieu08062aa2011-09-06 21:01:04 +00005813 << LHS.get()->getType() << RHS.get()->getType()
5814 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00005815 return QualType();
Sebastian Redl22460502009-02-07 00:15:38 +00005816}
5817
Richard Trieu481037f2011-09-16 00:53:10 +00005818// checkArithmeticNull - Detect when a NULL constant is used improperly in an
5819// expression. These are mainly cases where the null pointer is used as an
5820// integer instead of a pointer.
5821static void checkArithmeticNull(Sema &S, ExprResult &LHS, ExprResult &RHS,
5822 SourceLocation Loc, bool IsCompare) {
5823 // The canonical way to check for a GNU null is with isNullPointerConstant,
5824 // but we use a bit of a hack here for speed; this is a relatively
5825 // hot path, and isNullPointerConstant is slow.
5826 bool LHSNull = isa<GNUNullExpr>(LHS.get()->IgnoreParenImpCasts());
5827 bool RHSNull = isa<GNUNullExpr>(RHS.get()->IgnoreParenImpCasts());
5828
5829 QualType NonNullType = LHSNull ? RHS.get()->getType() : LHS.get()->getType();
5830
5831 // Avoid analyzing cases where the result will either be invalid (and
5832 // diagnosed as such) or entirely valid and not something to warn about.
5833 if ((!LHSNull && !RHSNull) || NonNullType->isBlockPointerType() ||
5834 NonNullType->isMemberPointerType() || NonNullType->isFunctionType())
5835 return;
5836
5837 // Comparison operations would not make sense with a null pointer no matter
5838 // what the other expression is.
5839 if (!IsCompare) {
5840 S.Diag(Loc, diag::warn_null_in_arithmetic_operation)
5841 << (LHSNull ? LHS.get()->getSourceRange() : SourceRange())
5842 << (RHSNull ? RHS.get()->getSourceRange() : SourceRange());
5843 return;
5844 }
5845
5846 // The rest of the operations only make sense with a null pointer
5847 // if the other expression is a pointer.
5848 if (LHSNull == RHSNull || NonNullType->isAnyPointerType() ||
5849 NonNullType->canDecayToPointerType())
5850 return;
5851
5852 S.Diag(Loc, diag::warn_null_in_comparison_operation)
5853 << LHSNull /* LHS is NULL */ << NonNullType
5854 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
5855}
5856
Richard Trieu08062aa2011-09-06 21:01:04 +00005857QualType Sema::CheckMultiplyDivideOperands(ExprResult &LHS, ExprResult &RHS,
Richard Trieu67e29332011-08-02 04:35:43 +00005858 SourceLocation Loc,
Richard Trieuccd891a2011-09-09 01:45:06 +00005859 bool IsCompAssign, bool IsDiv) {
Richard Trieu481037f2011-09-16 00:53:10 +00005860 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
5861
Richard Trieu08062aa2011-09-06 21:01:04 +00005862 if (LHS.get()->getType()->isVectorType() ||
5863 RHS.get()->getType()->isVectorType())
Richard Trieuccd891a2011-09-09 01:45:06 +00005864 return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign);
Mike Stumpeed9cac2009-02-19 03:04:26 +00005865
Richard Trieuccd891a2011-09-09 01:45:06 +00005866 QualType compType = UsualArithmeticConversions(LHS, RHS, IsCompAssign);
Richard Trieu08062aa2011-09-06 21:01:04 +00005867 if (LHS.isInvalid() || RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00005868 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005869
Richard Trieu08062aa2011-09-06 21:01:04 +00005870 if (!LHS.get()->getType()->isArithmeticType() ||
5871 !RHS.get()->getType()->isArithmeticType())
5872 return InvalidOperands(Loc, LHS, RHS);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005873
Chris Lattner7ef655a2010-01-12 21:23:57 +00005874 // Check for division by zero.
Richard Trieuccd891a2011-09-09 01:45:06 +00005875 if (IsDiv &&
Richard Trieu08062aa2011-09-06 21:01:04 +00005876 RHS.get()->isNullPointerConstant(Context,
Richard Trieu67e29332011-08-02 04:35:43 +00005877 Expr::NPC_ValueDependentIsNotNull))
Richard Trieu08062aa2011-09-06 21:01:04 +00005878 DiagRuntimeBehavior(Loc, RHS.get(), PDiag(diag::warn_division_by_zero)
5879 << RHS.get()->getSourceRange());
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005880
Chris Lattner7ef655a2010-01-12 21:23:57 +00005881 return compType;
Reid Spencer5f016e22007-07-11 17:01:13 +00005882}
5883
Chris Lattner7ef655a2010-01-12 21:23:57 +00005884QualType Sema::CheckRemainderOperands(
Richard Trieuccd891a2011-09-09 01:45:06 +00005885 ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign) {
Richard Trieu481037f2011-09-16 00:53:10 +00005886 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
5887
Richard Trieu08062aa2011-09-06 21:01:04 +00005888 if (LHS.get()->getType()->isVectorType() ||
5889 RHS.get()->getType()->isVectorType()) {
5890 if (LHS.get()->getType()->hasIntegerRepresentation() &&
5891 RHS.get()->getType()->hasIntegerRepresentation())
Richard Trieuccd891a2011-09-09 01:45:06 +00005892 return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign);
Richard Trieu08062aa2011-09-06 21:01:04 +00005893 return InvalidOperands(Loc, LHS, RHS);
Daniel Dunbar523aa602009-01-05 22:55:36 +00005894 }
Steve Naroff90045e82007-07-13 23:32:42 +00005895
Richard Trieuccd891a2011-09-09 01:45:06 +00005896 QualType compType = UsualArithmeticConversions(LHS, RHS, IsCompAssign);
Richard Trieu08062aa2011-09-06 21:01:04 +00005897 if (LHS.isInvalid() || RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00005898 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005899
Richard Trieu08062aa2011-09-06 21:01:04 +00005900 if (!LHS.get()->getType()->isIntegerType() ||
5901 !RHS.get()->getType()->isIntegerType())
5902 return InvalidOperands(Loc, LHS, RHS);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005903
Chris Lattner7ef655a2010-01-12 21:23:57 +00005904 // Check for remainder by zero.
Richard Trieu08062aa2011-09-06 21:01:04 +00005905 if (RHS.get()->isNullPointerConstant(Context,
Richard Trieu67e29332011-08-02 04:35:43 +00005906 Expr::NPC_ValueDependentIsNotNull))
Richard Trieu08062aa2011-09-06 21:01:04 +00005907 DiagRuntimeBehavior(Loc, RHS.get(), PDiag(diag::warn_remainder_by_zero)
5908 << RHS.get()->getSourceRange());
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005909
Chris Lattner7ef655a2010-01-12 21:23:57 +00005910 return compType;
Reid Spencer5f016e22007-07-11 17:01:13 +00005911}
5912
Chandler Carruth13b21be2011-06-27 08:02:19 +00005913/// \brief Diagnose invalid arithmetic on two void pointers.
5914static void diagnoseArithmeticOnTwoVoidPointers(Sema &S, SourceLocation Loc,
Richard Trieudef75842011-09-06 21:13:51 +00005915 Expr *LHSExpr, Expr *RHSExpr) {
Chandler Carruth13b21be2011-06-27 08:02:19 +00005916 S.Diag(Loc, S.getLangOptions().CPlusPlus
5917 ? diag::err_typecheck_pointer_arith_void_type
5918 : diag::ext_gnu_void_ptr)
Richard Trieudef75842011-09-06 21:13:51 +00005919 << 1 /* two pointers */ << LHSExpr->getSourceRange()
5920 << RHSExpr->getSourceRange();
Chandler Carruth13b21be2011-06-27 08:02:19 +00005921}
5922
5923/// \brief Diagnose invalid arithmetic on a void pointer.
5924static void diagnoseArithmeticOnVoidPointer(Sema &S, SourceLocation Loc,
5925 Expr *Pointer) {
5926 S.Diag(Loc, S.getLangOptions().CPlusPlus
5927 ? diag::err_typecheck_pointer_arith_void_type
5928 : diag::ext_gnu_void_ptr)
5929 << 0 /* one pointer */ << Pointer->getSourceRange();
5930}
5931
5932/// \brief Diagnose invalid arithmetic on two function pointers.
5933static void diagnoseArithmeticOnTwoFunctionPointers(Sema &S, SourceLocation Loc,
5934 Expr *LHS, Expr *RHS) {
5935 assert(LHS->getType()->isAnyPointerType());
5936 assert(RHS->getType()->isAnyPointerType());
5937 S.Diag(Loc, S.getLangOptions().CPlusPlus
5938 ? diag::err_typecheck_pointer_arith_function_type
5939 : diag::ext_gnu_ptr_func_arith)
5940 << 1 /* two pointers */ << LHS->getType()->getPointeeType()
5941 // We only show the second type if it differs from the first.
5942 << (unsigned)!S.Context.hasSameUnqualifiedType(LHS->getType(),
5943 RHS->getType())
5944 << RHS->getType()->getPointeeType()
5945 << LHS->getSourceRange() << RHS->getSourceRange();
5946}
5947
5948/// \brief Diagnose invalid arithmetic on a function pointer.
5949static void diagnoseArithmeticOnFunctionPointer(Sema &S, SourceLocation Loc,
5950 Expr *Pointer) {
5951 assert(Pointer->getType()->isAnyPointerType());
5952 S.Diag(Loc, S.getLangOptions().CPlusPlus
5953 ? diag::err_typecheck_pointer_arith_function_type
5954 : diag::ext_gnu_ptr_func_arith)
5955 << 0 /* one pointer */ << Pointer->getType()->getPointeeType()
5956 << 0 /* one pointer, so only one type */
5957 << Pointer->getSourceRange();
5958}
5959
Richard Trieud9f19342011-09-12 18:08:02 +00005960/// \brief Emit error if Operand is incomplete pointer type
Richard Trieu097ecd22011-09-02 02:15:37 +00005961///
5962/// \returns True if pointer has incomplete type
5963static bool checkArithmeticIncompletePointerType(Sema &S, SourceLocation Loc,
5964 Expr *Operand) {
5965 if ((Operand->getType()->isPointerType() &&
5966 !Operand->getType()->isDependentType()) ||
5967 Operand->getType()->isObjCObjectPointerType()) {
5968 QualType PointeeTy = Operand->getType()->getPointeeType();
5969 if (S.RequireCompleteType(
5970 Loc, PointeeTy,
5971 S.PDiag(diag::err_typecheck_arithmetic_incomplete_type)
5972 << PointeeTy << Operand->getSourceRange()))
5973 return true;
5974 }
5975 return false;
5976}
5977
Chandler Carruth13b21be2011-06-27 08:02:19 +00005978/// \brief Check the validity of an arithmetic pointer operand.
5979///
5980/// If the operand has pointer type, this code will check for pointer types
5981/// which are invalid in arithmetic operations. These will be diagnosed
5982/// appropriately, including whether or not the use is supported as an
5983/// extension.
5984///
5985/// \returns True when the operand is valid to use (even if as an extension).
5986static bool checkArithmeticOpPointerOperand(Sema &S, SourceLocation Loc,
5987 Expr *Operand) {
5988 if (!Operand->getType()->isAnyPointerType()) return true;
5989
5990 QualType PointeeTy = Operand->getType()->getPointeeType();
5991 if (PointeeTy->isVoidType()) {
5992 diagnoseArithmeticOnVoidPointer(S, Loc, Operand);
5993 return !S.getLangOptions().CPlusPlus;
5994 }
5995 if (PointeeTy->isFunctionType()) {
5996 diagnoseArithmeticOnFunctionPointer(S, Loc, Operand);
5997 return !S.getLangOptions().CPlusPlus;
5998 }
5999
Richard Trieu097ecd22011-09-02 02:15:37 +00006000 if (checkArithmeticIncompletePointerType(S, Loc, Operand)) return false;
Chandler Carruth13b21be2011-06-27 08:02:19 +00006001
6002 return true;
6003}
6004
6005/// \brief Check the validity of a binary arithmetic operation w.r.t. pointer
6006/// operands.
6007///
6008/// This routine will diagnose any invalid arithmetic on pointer operands much
6009/// like \see checkArithmeticOpPointerOperand. However, it has special logic
6010/// for emitting a single diagnostic even for operations where both LHS and RHS
6011/// are (potentially problematic) pointers.
6012///
6013/// \returns True when the operand is valid to use (even if as an extension).
6014static bool checkArithmeticBinOpPointerOperands(Sema &S, SourceLocation Loc,
Richard Trieudef75842011-09-06 21:13:51 +00006015 Expr *LHSExpr, Expr *RHSExpr) {
6016 bool isLHSPointer = LHSExpr->getType()->isAnyPointerType();
6017 bool isRHSPointer = RHSExpr->getType()->isAnyPointerType();
Chandler Carruth13b21be2011-06-27 08:02:19 +00006018 if (!isLHSPointer && !isRHSPointer) return true;
6019
6020 QualType LHSPointeeTy, RHSPointeeTy;
Richard Trieudef75842011-09-06 21:13:51 +00006021 if (isLHSPointer) LHSPointeeTy = LHSExpr->getType()->getPointeeType();
6022 if (isRHSPointer) RHSPointeeTy = RHSExpr->getType()->getPointeeType();
Chandler Carruth13b21be2011-06-27 08:02:19 +00006023
6024 // Check for arithmetic on pointers to incomplete types.
6025 bool isLHSVoidPtr = isLHSPointer && LHSPointeeTy->isVoidType();
6026 bool isRHSVoidPtr = isRHSPointer && RHSPointeeTy->isVoidType();
6027 if (isLHSVoidPtr || isRHSVoidPtr) {
Richard Trieudef75842011-09-06 21:13:51 +00006028 if (!isRHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, LHSExpr);
6029 else if (!isLHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, RHSExpr);
6030 else diagnoseArithmeticOnTwoVoidPointers(S, Loc, LHSExpr, RHSExpr);
Chandler Carruth13b21be2011-06-27 08:02:19 +00006031
6032 return !S.getLangOptions().CPlusPlus;
6033 }
6034
6035 bool isLHSFuncPtr = isLHSPointer && LHSPointeeTy->isFunctionType();
6036 bool isRHSFuncPtr = isRHSPointer && RHSPointeeTy->isFunctionType();
6037 if (isLHSFuncPtr || isRHSFuncPtr) {
Richard Trieudef75842011-09-06 21:13:51 +00006038 if (!isRHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc, LHSExpr);
6039 else if (!isLHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc,
6040 RHSExpr);
6041 else diagnoseArithmeticOnTwoFunctionPointers(S, Loc, LHSExpr, RHSExpr);
Chandler Carruth13b21be2011-06-27 08:02:19 +00006042
6043 return !S.getLangOptions().CPlusPlus;
6044 }
6045
Richard Trieudef75842011-09-06 21:13:51 +00006046 if (checkArithmeticIncompletePointerType(S, Loc, LHSExpr)) return false;
6047 if (checkArithmeticIncompletePointerType(S, Loc, RHSExpr)) return false;
Richard Trieu097ecd22011-09-02 02:15:37 +00006048
Chandler Carruth13b21be2011-06-27 08:02:19 +00006049 return true;
6050}
6051
Richard Trieudb44a6b2011-09-01 22:53:23 +00006052/// \brief Check bad cases where we step over interface counts.
6053static bool checkArithmethicPointerOnNonFragileABI(Sema &S,
6054 SourceLocation OpLoc,
6055 Expr *Op) {
6056 assert(Op->getType()->isAnyPointerType());
6057 QualType PointeeTy = Op->getType()->getPointeeType();
6058 if (!PointeeTy->isObjCObjectType() || !S.LangOpts.ObjCNonFragileABI)
6059 return true;
6060
6061 S.Diag(OpLoc, diag::err_arithmetic_nonfragile_interface)
6062 << PointeeTy << Op->getSourceRange();
6063 return false;
6064}
6065
Richard Trieud9f19342011-09-12 18:08:02 +00006066/// \brief Emit error when two pointers are incompatible.
Richard Trieudb44a6b2011-09-01 22:53:23 +00006067static void diagnosePointerIncompatibility(Sema &S, SourceLocation Loc,
Richard Trieudef75842011-09-06 21:13:51 +00006068 Expr *LHSExpr, Expr *RHSExpr) {
6069 assert(LHSExpr->getType()->isAnyPointerType());
6070 assert(RHSExpr->getType()->isAnyPointerType());
Richard Trieudb44a6b2011-09-01 22:53:23 +00006071 S.Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
Richard Trieudef75842011-09-06 21:13:51 +00006072 << LHSExpr->getType() << RHSExpr->getType() << LHSExpr->getSourceRange()
6073 << RHSExpr->getSourceRange();
Richard Trieudb44a6b2011-09-01 22:53:23 +00006074}
6075
Chris Lattner7ef655a2010-01-12 21:23:57 +00006076QualType Sema::CheckAdditionOperands( // C99 6.5.6
Richard Trieudef75842011-09-06 21:13:51 +00006077 ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, QualType* CompLHSTy) {
Richard Trieu481037f2011-09-16 00:53:10 +00006078 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
6079
Richard Trieudef75842011-09-06 21:13:51 +00006080 if (LHS.get()->getType()->isVectorType() ||
6081 RHS.get()->getType()->isVectorType()) {
6082 QualType compType = CheckVectorOperands(LHS, RHS, Loc, CompLHSTy);
Eli Friedmanab3a8522009-03-28 01:22:36 +00006083 if (CompLHSTy) *CompLHSTy = compType;
6084 return compType;
6085 }
Steve Naroff49b45262007-07-13 16:58:59 +00006086
Richard Trieudef75842011-09-06 21:13:51 +00006087 QualType compType = UsualArithmeticConversions(LHS, RHS, CompLHSTy);
6088 if (LHS.isInvalid() || RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006089 return QualType();
Eli Friedmand72d16e2008-05-18 18:08:51 +00006090
Reid Spencer5f016e22007-07-11 17:01:13 +00006091 // handle the common case first (both operands are arithmetic).
Richard Trieudef75842011-09-06 21:13:51 +00006092 if (LHS.get()->getType()->isArithmeticType() &&
6093 RHS.get()->getType()->isArithmeticType()) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00006094 if (CompLHSTy) *CompLHSTy = compType;
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00006095 return compType;
Eli Friedmanab3a8522009-03-28 01:22:36 +00006096 }
Reid Spencer5f016e22007-07-11 17:01:13 +00006097
Eli Friedmand72d16e2008-05-18 18:08:51 +00006098 // Put any potential pointer into PExp
Richard Trieudef75842011-09-06 21:13:51 +00006099 Expr* PExp = LHS.get(), *IExp = RHS.get();
Steve Naroff58f9f2c2009-07-14 18:25:06 +00006100 if (IExp->getType()->isAnyPointerType())
Eli Friedmand72d16e2008-05-18 18:08:51 +00006101 std::swap(PExp, IExp);
6102
Richard Trieu6eef9fb2011-09-12 18:37:54 +00006103 if (!PExp->getType()->isAnyPointerType())
6104 return InvalidOperands(Loc, LHS, RHS);
Chandler Carruth13b21be2011-06-27 08:02:19 +00006105
Richard Trieu6eef9fb2011-09-12 18:37:54 +00006106 if (!IExp->getType()->isIntegerType())
6107 return InvalidOperands(Loc, LHS, RHS);
Mike Stump1eb44332009-09-09 15:08:12 +00006108
Richard Trieu6eef9fb2011-09-12 18:37:54 +00006109 if (!checkArithmeticOpPointerOperand(*this, Loc, PExp))
6110 return QualType();
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00006111
Richard Trieu6eef9fb2011-09-12 18:37:54 +00006112 // Diagnose bad cases where we step over interface counts.
6113 if (!checkArithmethicPointerOnNonFragileABI(*this, Loc, PExp))
6114 return QualType();
6115
6116 // Check array bounds for pointer arithemtic
6117 CheckArrayAccess(PExp, IExp);
6118
6119 if (CompLHSTy) {
6120 QualType LHSTy = Context.isPromotableBitField(LHS.get());
6121 if (LHSTy.isNull()) {
6122 LHSTy = LHS.get()->getType();
6123 if (LHSTy->isPromotableIntegerType())
6124 LHSTy = Context.getPromotedIntegerType(LHSTy);
Eli Friedmand72d16e2008-05-18 18:08:51 +00006125 }
Richard Trieu6eef9fb2011-09-12 18:37:54 +00006126 *CompLHSTy = LHSTy;
Eli Friedmand72d16e2008-05-18 18:08:51 +00006127 }
6128
Richard Trieu6eef9fb2011-09-12 18:37:54 +00006129 return PExp->getType();
Reid Spencer5f016e22007-07-11 17:01:13 +00006130}
6131
Chris Lattnereca7be62008-04-07 05:30:13 +00006132// C99 6.5.6
Richard Trieudef75842011-09-06 21:13:51 +00006133QualType Sema::CheckSubtractionOperands(ExprResult &LHS, ExprResult &RHS,
Richard Trieu67e29332011-08-02 04:35:43 +00006134 SourceLocation Loc,
6135 QualType* CompLHSTy) {
Richard Trieu481037f2011-09-16 00:53:10 +00006136 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
6137
Richard Trieudef75842011-09-06 21:13:51 +00006138 if (LHS.get()->getType()->isVectorType() ||
6139 RHS.get()->getType()->isVectorType()) {
6140 QualType compType = CheckVectorOperands(LHS, RHS, Loc, CompLHSTy);
Eli Friedmanab3a8522009-03-28 01:22:36 +00006141 if (CompLHSTy) *CompLHSTy = compType;
6142 return compType;
6143 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006144
Richard Trieudef75842011-09-06 21:13:51 +00006145 QualType compType = UsualArithmeticConversions(LHS, RHS, CompLHSTy);
6146 if (LHS.isInvalid() || RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006147 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006148
Chris Lattner6e4ab612007-12-09 21:53:25 +00006149 // Enforce type constraints: C99 6.5.6p3.
Mike Stumpeed9cac2009-02-19 03:04:26 +00006150
Chris Lattner6e4ab612007-12-09 21:53:25 +00006151 // Handle the common case first (both operands are arithmetic).
Richard Trieudef75842011-09-06 21:13:51 +00006152 if (LHS.get()->getType()->isArithmeticType() &&
6153 RHS.get()->getType()->isArithmeticType()) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00006154 if (CompLHSTy) *CompLHSTy = compType;
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00006155 return compType;
Eli Friedmanab3a8522009-03-28 01:22:36 +00006156 }
Mike Stump1eb44332009-09-09 15:08:12 +00006157
Chris Lattner6e4ab612007-12-09 21:53:25 +00006158 // Either ptr - int or ptr - ptr.
Richard Trieudef75842011-09-06 21:13:51 +00006159 if (LHS.get()->getType()->isAnyPointerType()) {
6160 QualType lpointee = LHS.get()->getType()->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006161
Chris Lattnerb5f15622009-04-24 23:50:08 +00006162 // Diagnose bad cases where we step over interface counts.
Richard Trieudef75842011-09-06 21:13:51 +00006163 if (!checkArithmethicPointerOnNonFragileABI(*this, Loc, LHS.get()))
Chris Lattnerb5f15622009-04-24 23:50:08 +00006164 return QualType();
Mike Stump1eb44332009-09-09 15:08:12 +00006165
Chris Lattner6e4ab612007-12-09 21:53:25 +00006166 // The result type of a pointer-int computation is the pointer type.
Richard Trieudef75842011-09-06 21:13:51 +00006167 if (RHS.get()->getType()->isIntegerType()) {
6168 if (!checkArithmeticOpPointerOperand(*this, Loc, LHS.get()))
Chandler Carruth13b21be2011-06-27 08:02:19 +00006169 return QualType();
Douglas Gregore7450f52009-03-24 19:52:54 +00006170
Richard Trieudef75842011-09-06 21:13:51 +00006171 Expr *IExpr = RHS.get()->IgnoreParenCasts();
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00006172 UnaryOperator negRex(IExpr, UO_Minus, IExpr->getType(), VK_RValue,
6173 OK_Ordinary, IExpr->getExprLoc());
6174 // Check array bounds for pointer arithemtic
Richard Trieudef75842011-09-06 21:13:51 +00006175 CheckArrayAccess(LHS.get()->IgnoreParenCasts(), &negRex);
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00006176
Richard Trieudef75842011-09-06 21:13:51 +00006177 if (CompLHSTy) *CompLHSTy = LHS.get()->getType();
6178 return LHS.get()->getType();
Douglas Gregore7450f52009-03-24 19:52:54 +00006179 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006180
Chris Lattner6e4ab612007-12-09 21:53:25 +00006181 // Handle pointer-pointer subtractions.
Richard Trieu67e29332011-08-02 04:35:43 +00006182 if (const PointerType *RHSPTy
Richard Trieudef75842011-09-06 21:13:51 +00006183 = RHS.get()->getType()->getAs<PointerType>()) {
Eli Friedman8e54ad02008-02-08 01:19:44 +00006184 QualType rpointee = RHSPTy->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006185
Eli Friedman88d936b2009-05-16 13:54:38 +00006186 if (getLangOptions().CPlusPlus) {
6187 // Pointee types must be the same: C++ [expr.add]
6188 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) {
Richard Trieudef75842011-09-06 21:13:51 +00006189 diagnosePointerIncompatibility(*this, Loc, LHS.get(), RHS.get());
Eli Friedman88d936b2009-05-16 13:54:38 +00006190 }
6191 } else {
6192 // Pointee types must be compatible C99 6.5.6p3
6193 if (!Context.typesAreCompatible(
6194 Context.getCanonicalType(lpointee).getUnqualifiedType(),
6195 Context.getCanonicalType(rpointee).getUnqualifiedType())) {
Richard Trieudef75842011-09-06 21:13:51 +00006196 diagnosePointerIncompatibility(*this, Loc, LHS.get(), RHS.get());
Eli Friedman88d936b2009-05-16 13:54:38 +00006197 return QualType();
6198 }
Chris Lattner6e4ab612007-12-09 21:53:25 +00006199 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006200
Chandler Carruth13b21be2011-06-27 08:02:19 +00006201 if (!checkArithmeticBinOpPointerOperands(*this, Loc,
Richard Trieudef75842011-09-06 21:13:51 +00006202 LHS.get(), RHS.get()))
Chandler Carruth13b21be2011-06-27 08:02:19 +00006203 return QualType();
Eli Friedmanab3a8522009-03-28 01:22:36 +00006204
Richard Trieudef75842011-09-06 21:13:51 +00006205 if (CompLHSTy) *CompLHSTy = LHS.get()->getType();
Chris Lattner6e4ab612007-12-09 21:53:25 +00006206 return Context.getPointerDiffType();
6207 }
6208 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006209
Richard Trieudef75842011-09-06 21:13:51 +00006210 return InvalidOperands(Loc, LHS, RHS);
Reid Spencer5f016e22007-07-11 17:01:13 +00006211}
6212
Douglas Gregor1274ccd2010-10-08 23:50:27 +00006213static bool isScopedEnumerationType(QualType T) {
6214 if (const EnumType *ET = dyn_cast<EnumType>(T))
6215 return ET->getDecl()->isScoped();
6216 return false;
6217}
6218
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006219static void DiagnoseBadShiftValues(Sema& S, ExprResult &LHS, ExprResult &RHS,
Chandler Carruth21206d52011-02-23 23:34:11 +00006220 SourceLocation Loc, unsigned Opc,
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006221 QualType LHSType) {
Chandler Carruth21206d52011-02-23 23:34:11 +00006222 llvm::APSInt Right;
6223 // Check right/shifter operand
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006224 if (RHS.get()->isValueDependent() ||
6225 !RHS.get()->isIntegerConstantExpr(Right, S.Context))
Chandler Carruth21206d52011-02-23 23:34:11 +00006226 return;
6227
6228 if (Right.isNegative()) {
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006229 S.DiagRuntimeBehavior(Loc, RHS.get(),
Ted Kremenek082bf7a2011-03-01 18:09:31 +00006230 S.PDiag(diag::warn_shift_negative)
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006231 << RHS.get()->getSourceRange());
Chandler Carruth21206d52011-02-23 23:34:11 +00006232 return;
6233 }
6234 llvm::APInt LeftBits(Right.getBitWidth(),
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006235 S.Context.getTypeSize(LHS.get()->getType()));
Chandler Carruth21206d52011-02-23 23:34:11 +00006236 if (Right.uge(LeftBits)) {
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006237 S.DiagRuntimeBehavior(Loc, RHS.get(),
Ted Kremenek425a31e2011-03-01 19:13:22 +00006238 S.PDiag(diag::warn_shift_gt_typewidth)
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006239 << RHS.get()->getSourceRange());
Chandler Carruth21206d52011-02-23 23:34:11 +00006240 return;
6241 }
6242 if (Opc != BO_Shl)
6243 return;
6244
6245 // When left shifting an ICE which is signed, we can check for overflow which
6246 // according to C++ has undefined behavior ([expr.shift] 5.8/2). Unsigned
6247 // integers have defined behavior modulo one more than the maximum value
6248 // representable in the result type, so never warn for those.
6249 llvm::APSInt Left;
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006250 if (LHS.get()->isValueDependent() ||
6251 !LHS.get()->isIntegerConstantExpr(Left, S.Context) ||
6252 LHSType->hasUnsignedIntegerRepresentation())
Chandler Carruth21206d52011-02-23 23:34:11 +00006253 return;
6254 llvm::APInt ResultBits =
6255 static_cast<llvm::APInt&>(Right) + Left.getMinSignedBits();
6256 if (LeftBits.uge(ResultBits))
6257 return;
6258 llvm::APSInt Result = Left.extend(ResultBits.getLimitedValue());
6259 Result = Result.shl(Right);
6260
Ted Kremenekfa821382011-06-15 00:54:52 +00006261 // Print the bit representation of the signed integer as an unsigned
6262 // hexadecimal number.
6263 llvm::SmallString<40> HexResult;
6264 Result.toString(HexResult, 16, /*Signed =*/false, /*Literal =*/true);
6265
Chandler Carruth21206d52011-02-23 23:34:11 +00006266 // If we are only missing a sign bit, this is less likely to result in actual
6267 // bugs -- if the result is cast back to an unsigned type, it will have the
6268 // expected value. Thus we place this behind a different warning that can be
6269 // turned off separately if needed.
6270 if (LeftBits == ResultBits - 1) {
Ted Kremenekfa821382011-06-15 00:54:52 +00006271 S.Diag(Loc, diag::warn_shift_result_sets_sign_bit)
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006272 << HexResult.str() << LHSType
6273 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Chandler Carruth21206d52011-02-23 23:34:11 +00006274 return;
6275 }
6276
6277 S.Diag(Loc, diag::warn_shift_result_gt_typewidth)
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006278 << HexResult.str() << Result.getMinSignedBits() << LHSType
6279 << Left.getBitWidth() << LHS.get()->getSourceRange()
6280 << RHS.get()->getSourceRange();
Chandler Carruth21206d52011-02-23 23:34:11 +00006281}
6282
Chris Lattnereca7be62008-04-07 05:30:13 +00006283// C99 6.5.7
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006284QualType Sema::CheckShiftOperands(ExprResult &LHS, ExprResult &RHS,
Richard Trieu67e29332011-08-02 04:35:43 +00006285 SourceLocation Loc, unsigned Opc,
Richard Trieuccd891a2011-09-09 01:45:06 +00006286 bool IsCompAssign) {
Richard Trieu481037f2011-09-16 00:53:10 +00006287 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
6288
Chris Lattnerca5eede2007-12-12 05:47:28 +00006289 // C99 6.5.7p2: Each of the operands shall have integer type.
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006290 if (!LHS.get()->getType()->hasIntegerRepresentation() ||
6291 !RHS.get()->getType()->hasIntegerRepresentation())
6292 return InvalidOperands(Loc, LHS, RHS);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006293
Douglas Gregor1274ccd2010-10-08 23:50:27 +00006294 // C++0x: Don't allow scoped enums. FIXME: Use something better than
6295 // hasIntegerRepresentation() above instead of this.
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006296 if (isScopedEnumerationType(LHS.get()->getType()) ||
6297 isScopedEnumerationType(RHS.get()->getType())) {
6298 return InvalidOperands(Loc, LHS, RHS);
Douglas Gregor1274ccd2010-10-08 23:50:27 +00006299 }
6300
Nate Begeman2207d792009-10-25 02:26:48 +00006301 // Vector shifts promote their scalar inputs to vector type.
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006302 if (LHS.get()->getType()->isVectorType() ||
6303 RHS.get()->getType()->isVectorType())
Richard Trieuccd891a2011-09-09 01:45:06 +00006304 return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign);
Nate Begeman2207d792009-10-25 02:26:48 +00006305
Chris Lattnerca5eede2007-12-12 05:47:28 +00006306 // Shifts don't perform usual arithmetic conversions, they just do integer
6307 // promotions on each operand. C99 6.5.7p3
Eli Friedmanab3a8522009-03-28 01:22:36 +00006308
John McCall1bc80af2010-12-16 19:28:59 +00006309 // For the LHS, do usual unary conversions, but then reset them away
6310 // if this is a compound assignment.
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006311 ExprResult OldLHS = LHS;
6312 LHS = UsualUnaryConversions(LHS.take());
6313 if (LHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006314 return QualType();
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006315 QualType LHSType = LHS.get()->getType();
Richard Trieuccd891a2011-09-09 01:45:06 +00006316 if (IsCompAssign) LHS = OldLHS;
John McCall1bc80af2010-12-16 19:28:59 +00006317
6318 // The RHS is simpler.
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006319 RHS = UsualUnaryConversions(RHS.take());
6320 if (RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006321 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006322
Ryan Flynnd0439682009-08-07 16:20:20 +00006323 // Sanity-check shift operands
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006324 DiagnoseBadShiftValues(*this, LHS, RHS, Loc, Opc, LHSType);
Ryan Flynnd0439682009-08-07 16:20:20 +00006325
Chris Lattnerca5eede2007-12-12 05:47:28 +00006326 // "The type of the result is that of the promoted left operand."
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006327 return LHSType;
Reid Spencer5f016e22007-07-11 17:01:13 +00006328}
6329
Chandler Carruth99919472010-07-10 12:30:03 +00006330static bool IsWithinTemplateSpecialization(Decl *D) {
6331 if (DeclContext *DC = D->getDeclContext()) {
6332 if (isa<ClassTemplateSpecializationDecl>(DC))
6333 return true;
6334 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(DC))
6335 return FD->isFunctionTemplateSpecialization();
6336 }
6337 return false;
6338}
6339
Richard Trieue648ac32011-09-02 03:48:46 +00006340/// If two different enums are compared, raise a warning.
Richard Trieuba261492011-09-06 21:27:33 +00006341static void checkEnumComparison(Sema &S, SourceLocation Loc, ExprResult &LHS,
6342 ExprResult &RHS) {
6343 QualType LHSStrippedType = LHS.get()->IgnoreParenImpCasts()->getType();
6344 QualType RHSStrippedType = RHS.get()->IgnoreParenImpCasts()->getType();
Richard Trieue648ac32011-09-02 03:48:46 +00006345
6346 const EnumType *LHSEnumType = LHSStrippedType->getAs<EnumType>();
6347 if (!LHSEnumType)
6348 return;
6349 const EnumType *RHSEnumType = RHSStrippedType->getAs<EnumType>();
6350 if (!RHSEnumType)
6351 return;
6352
6353 // Ignore anonymous enums.
6354 if (!LHSEnumType->getDecl()->getIdentifier())
6355 return;
6356 if (!RHSEnumType->getDecl()->getIdentifier())
6357 return;
6358
6359 if (S.Context.hasSameUnqualifiedType(LHSStrippedType, RHSStrippedType))
6360 return;
6361
6362 S.Diag(Loc, diag::warn_comparison_of_mixed_enum_types)
6363 << LHSStrippedType << RHSStrippedType
Richard Trieuba261492011-09-06 21:27:33 +00006364 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Richard Trieue648ac32011-09-02 03:48:46 +00006365}
6366
Richard Trieu7be1be02011-09-02 02:55:45 +00006367/// \brief Diagnose bad pointer comparisons.
6368static void diagnoseDistinctPointerComparison(Sema &S, SourceLocation Loc,
Richard Trieuba261492011-09-06 21:27:33 +00006369 ExprResult &LHS, ExprResult &RHS,
Richard Trieuccd891a2011-09-09 01:45:06 +00006370 bool IsError) {
6371 S.Diag(Loc, IsError ? diag::err_typecheck_comparison_of_distinct_pointers
Richard Trieu7be1be02011-09-02 02:55:45 +00006372 : diag::ext_typecheck_comparison_of_distinct_pointers)
Richard Trieuba261492011-09-06 21:27:33 +00006373 << LHS.get()->getType() << RHS.get()->getType()
6374 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Richard Trieu7be1be02011-09-02 02:55:45 +00006375}
6376
6377/// \brief Returns false if the pointers are converted to a composite type,
6378/// true otherwise.
6379static bool convertPointersToCompositeType(Sema &S, SourceLocation Loc,
Richard Trieuba261492011-09-06 21:27:33 +00006380 ExprResult &LHS, ExprResult &RHS) {
Richard Trieu7be1be02011-09-02 02:55:45 +00006381 // C++ [expr.rel]p2:
6382 // [...] Pointer conversions (4.10) and qualification
6383 // conversions (4.4) are performed on pointer operands (or on
6384 // a pointer operand and a null pointer constant) to bring
6385 // them to their composite pointer type. [...]
6386 //
6387 // C++ [expr.eq]p1 uses the same notion for (in)equality
6388 // comparisons of pointers.
6389
6390 // C++ [expr.eq]p2:
6391 // In addition, pointers to members can be compared, or a pointer to
6392 // member and a null pointer constant. Pointer to member conversions
6393 // (4.11) and qualification conversions (4.4) are performed to bring
6394 // them to a common type. If one operand is a null pointer constant,
6395 // the common type is the type of the other operand. Otherwise, the
6396 // common type is a pointer to member type similar (4.4) to the type
6397 // of one of the operands, with a cv-qualification signature (4.4)
6398 // that is the union of the cv-qualification signatures of the operand
6399 // types.
6400
Richard Trieuba261492011-09-06 21:27:33 +00006401 QualType LHSType = LHS.get()->getType();
6402 QualType RHSType = RHS.get()->getType();
6403 assert((LHSType->isPointerType() && RHSType->isPointerType()) ||
6404 (LHSType->isMemberPointerType() && RHSType->isMemberPointerType()));
Richard Trieu7be1be02011-09-02 02:55:45 +00006405
6406 bool NonStandardCompositeType = false;
Richard Trieu43dff1b2011-09-02 21:44:27 +00006407 bool *BoolPtr = S.isSFINAEContext() ? 0 : &NonStandardCompositeType;
Richard Trieuba261492011-09-06 21:27:33 +00006408 QualType T = S.FindCompositePointerType(Loc, LHS, RHS, BoolPtr);
Richard Trieu7be1be02011-09-02 02:55:45 +00006409 if (T.isNull()) {
Richard Trieuba261492011-09-06 21:27:33 +00006410 diagnoseDistinctPointerComparison(S, Loc, LHS, RHS, /*isError*/true);
Richard Trieu7be1be02011-09-02 02:55:45 +00006411 return true;
6412 }
6413
6414 if (NonStandardCompositeType)
6415 S.Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers_nonstandard)
Richard Trieuba261492011-09-06 21:27:33 +00006416 << LHSType << RHSType << T << LHS.get()->getSourceRange()
6417 << RHS.get()->getSourceRange();
Richard Trieu7be1be02011-09-02 02:55:45 +00006418
Richard Trieuba261492011-09-06 21:27:33 +00006419 LHS = S.ImpCastExprToType(LHS.take(), T, CK_BitCast);
6420 RHS = S.ImpCastExprToType(RHS.take(), T, CK_BitCast);
Richard Trieu7be1be02011-09-02 02:55:45 +00006421 return false;
6422}
6423
6424static void diagnoseFunctionPointerToVoidComparison(Sema &S, SourceLocation Loc,
Richard Trieuba261492011-09-06 21:27:33 +00006425 ExprResult &LHS,
6426 ExprResult &RHS,
Richard Trieuccd891a2011-09-09 01:45:06 +00006427 bool IsError) {
6428 S.Diag(Loc, IsError ? diag::err_typecheck_comparison_of_fptr_to_void
6429 : diag::ext_typecheck_comparison_of_fptr_to_void)
Richard Trieuba261492011-09-06 21:27:33 +00006430 << LHS.get()->getType() << RHS.get()->getType()
6431 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Richard Trieu7be1be02011-09-02 02:55:45 +00006432}
6433
Douglas Gregor0c6db942009-05-04 06:07:12 +00006434// C99 6.5.8, C++ [expr.rel]
Richard Trieuf1775fb2011-09-06 21:43:51 +00006435QualType Sema::CheckCompareOperands(ExprResult &LHS, ExprResult &RHS,
Richard Trieu67e29332011-08-02 04:35:43 +00006436 SourceLocation Loc, unsigned OpaqueOpc,
Richard Trieuccd891a2011-09-09 01:45:06 +00006437 bool IsRelational) {
Richard Trieu481037f2011-09-16 00:53:10 +00006438 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/true);
6439
John McCall2de56d12010-08-25 11:45:40 +00006440 BinaryOperatorKind Opc = (BinaryOperatorKind) OpaqueOpc;
Douglas Gregora86b8322009-04-06 18:45:53 +00006441
Chris Lattner02dd4b12009-12-05 05:40:13 +00006442 // Handle vector comparisons separately.
Richard Trieuf1775fb2011-09-06 21:43:51 +00006443 if (LHS.get()->getType()->isVectorType() ||
6444 RHS.get()->getType()->isVectorType())
Richard Trieuccd891a2011-09-09 01:45:06 +00006445 return CheckVectorCompareOperands(LHS, RHS, Loc, IsRelational);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006446
Richard Trieuf1775fb2011-09-06 21:43:51 +00006447 QualType LHSType = LHS.get()->getType();
6448 QualType RHSType = RHS.get()->getType();
Benjamin Kramerfec09592011-09-03 08:46:20 +00006449
Richard Trieuf1775fb2011-09-06 21:43:51 +00006450 Expr *LHSStripped = LHS.get()->IgnoreParenImpCasts();
6451 Expr *RHSStripped = RHS.get()->IgnoreParenImpCasts();
Chandler Carruth543cb652011-02-17 08:37:06 +00006452
Richard Trieuf1775fb2011-09-06 21:43:51 +00006453 checkEnumComparison(*this, Loc, LHS, RHS);
Chandler Carruth543cb652011-02-17 08:37:06 +00006454
Richard Trieuf1775fb2011-09-06 21:43:51 +00006455 if (!LHSType->hasFloatingRepresentation() &&
Richard Trieuccd891a2011-09-09 01:45:06 +00006456 !(LHSType->isBlockPointerType() && IsRelational) &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006457 !LHS.get()->getLocStart().isMacroID() &&
6458 !RHS.get()->getLocStart().isMacroID()) {
Chris Lattner55660a72009-03-08 19:39:53 +00006459 // For non-floating point types, check for self-comparisons of the form
6460 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
6461 // often indicate logic errors in the program.
Chandler Carruth64d092c2010-07-12 06:23:38 +00006462 //
6463 // NOTE: Don't warn about comparison expressions resulting from macro
6464 // expansion. Also don't warn about comparisons which are only self
6465 // comparisons within a template specialization. The warnings should catch
6466 // obvious cases in the definition of the template anyways. The idea is to
6467 // warn when the typed comparison operator will always evaluate to the same
6468 // result.
Chandler Carruth99919472010-07-10 12:30:03 +00006469 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) {
Douglas Gregord64fdd02010-06-08 19:50:34 +00006470 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) {
Ted Kremenekfbcb0eb2010-09-16 00:03:01 +00006471 if (DRL->getDecl() == DRR->getDecl() &&
Chandler Carruth99919472010-07-10 12:30:03 +00006472 !IsWithinTemplateSpecialization(DRL->getDecl())) {
Ted Kremenek351ba912011-02-23 01:52:04 +00006473 DiagRuntimeBehavior(Loc, 0, PDiag(diag::warn_comparison_always)
Douglas Gregord64fdd02010-06-08 19:50:34 +00006474 << 0 // self-
John McCall2de56d12010-08-25 11:45:40 +00006475 << (Opc == BO_EQ
6476 || Opc == BO_LE
6477 || Opc == BO_GE));
Richard Trieuf1775fb2011-09-06 21:43:51 +00006478 } else if (LHSType->isArrayType() && RHSType->isArrayType() &&
Douglas Gregord64fdd02010-06-08 19:50:34 +00006479 !DRL->getDecl()->getType()->isReferenceType() &&
6480 !DRR->getDecl()->getType()->isReferenceType()) {
6481 // what is it always going to eval to?
6482 char always_evals_to;
6483 switch(Opc) {
John McCall2de56d12010-08-25 11:45:40 +00006484 case BO_EQ: // e.g. array1 == array2
Douglas Gregord64fdd02010-06-08 19:50:34 +00006485 always_evals_to = 0; // false
6486 break;
John McCall2de56d12010-08-25 11:45:40 +00006487 case BO_NE: // e.g. array1 != array2
Douglas Gregord64fdd02010-06-08 19:50:34 +00006488 always_evals_to = 1; // true
6489 break;
6490 default:
6491 // best we can say is 'a constant'
6492 always_evals_to = 2; // e.g. array1 <= array2
6493 break;
6494 }
Ted Kremenek351ba912011-02-23 01:52:04 +00006495 DiagRuntimeBehavior(Loc, 0, PDiag(diag::warn_comparison_always)
Douglas Gregord64fdd02010-06-08 19:50:34 +00006496 << 1 // array
6497 << always_evals_to);
6498 }
6499 }
Chandler Carruth99919472010-07-10 12:30:03 +00006500 }
Mike Stump1eb44332009-09-09 15:08:12 +00006501
Chris Lattner55660a72009-03-08 19:39:53 +00006502 if (isa<CastExpr>(LHSStripped))
6503 LHSStripped = LHSStripped->IgnoreParenCasts();
6504 if (isa<CastExpr>(RHSStripped))
6505 RHSStripped = RHSStripped->IgnoreParenCasts();
Mike Stump1eb44332009-09-09 15:08:12 +00006506
Chris Lattner55660a72009-03-08 19:39:53 +00006507 // Warn about comparisons against a string constant (unless the other
6508 // operand is null), the user probably wants strcmp.
Douglas Gregora86b8322009-04-06 18:45:53 +00006509 Expr *literalString = 0;
6510 Expr *literalStringStripped = 0;
Chris Lattner55660a72009-03-08 19:39:53 +00006511 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) &&
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006512 !RHSStripped->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006513 Expr::NPC_ValueDependentIsNull)) {
Richard Trieuf1775fb2011-09-06 21:43:51 +00006514 literalString = LHS.get();
Douglas Gregora86b8322009-04-06 18:45:53 +00006515 literalStringStripped = LHSStripped;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00006516 } else if ((isa<StringLiteral>(RHSStripped) ||
6517 isa<ObjCEncodeExpr>(RHSStripped)) &&
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006518 !LHSStripped->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006519 Expr::NPC_ValueDependentIsNull)) {
Richard Trieuf1775fb2011-09-06 21:43:51 +00006520 literalString = RHS.get();
Douglas Gregora86b8322009-04-06 18:45:53 +00006521 literalStringStripped = RHSStripped;
6522 }
6523
6524 if (literalString) {
6525 std::string resultComparison;
6526 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00006527 case BO_LT: resultComparison = ") < 0"; break;
6528 case BO_GT: resultComparison = ") > 0"; break;
6529 case BO_LE: resultComparison = ") <= 0"; break;
6530 case BO_GE: resultComparison = ") >= 0"; break;
6531 case BO_EQ: resultComparison = ") == 0"; break;
6532 case BO_NE: resultComparison = ") != 0"; break;
David Blaikieb219cfc2011-09-23 05:06:16 +00006533 default: llvm_unreachable("Invalid comparison operator");
Douglas Gregora86b8322009-04-06 18:45:53 +00006534 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006535
Ted Kremenek351ba912011-02-23 01:52:04 +00006536 DiagRuntimeBehavior(Loc, 0,
Douglas Gregord1e4d9b2010-01-12 23:18:54 +00006537 PDiag(diag::warn_stringcompare)
6538 << isa<ObjCEncodeExpr>(literalStringStripped)
Ted Kremenek03a4bee2010-04-09 20:26:53 +00006539 << literalString->getSourceRange());
Douglas Gregora86b8322009-04-06 18:45:53 +00006540 }
Ted Kremenek3ca0bf22007-10-29 16:58:49 +00006541 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006542
Douglas Gregord64fdd02010-06-08 19:50:34 +00006543 // C99 6.5.8p3 / C99 6.5.9p4
Richard Trieuf1775fb2011-09-06 21:43:51 +00006544 if (LHS.get()->getType()->isArithmeticType() &&
6545 RHS.get()->getType()->isArithmeticType()) {
6546 UsualArithmeticConversions(LHS, RHS);
6547 if (LHS.isInvalid() || RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006548 return QualType();
6549 }
Douglas Gregord64fdd02010-06-08 19:50:34 +00006550 else {
Richard Trieuf1775fb2011-09-06 21:43:51 +00006551 LHS = UsualUnaryConversions(LHS.take());
6552 if (LHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006553 return QualType();
6554
Richard Trieuf1775fb2011-09-06 21:43:51 +00006555 RHS = UsualUnaryConversions(RHS.take());
6556 if (RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006557 return QualType();
Douglas Gregord64fdd02010-06-08 19:50:34 +00006558 }
6559
Richard Trieuf1775fb2011-09-06 21:43:51 +00006560 LHSType = LHS.get()->getType();
6561 RHSType = RHS.get()->getType();
Douglas Gregord64fdd02010-06-08 19:50:34 +00006562
Douglas Gregor447b69e2008-11-19 03:25:36 +00006563 // The result of comparisons is 'bool' in C++, 'int' in C.
Argyrios Kyrtzidis16f744b2011-02-18 20:55:15 +00006564 QualType ResultTy = Context.getLogicalOperationType();
Douglas Gregor447b69e2008-11-19 03:25:36 +00006565
Richard Trieuccd891a2011-09-09 01:45:06 +00006566 if (IsRelational) {
Richard Trieuf1775fb2011-09-06 21:43:51 +00006567 if (LHSType->isRealType() && RHSType->isRealType())
Douglas Gregor447b69e2008-11-19 03:25:36 +00006568 return ResultTy;
Chris Lattnera5937dd2007-08-26 01:18:55 +00006569 } else {
Ted Kremenek72cb1ae2007-10-29 17:13:39 +00006570 // Check for comparisons of floating point operands using != and ==.
Richard Trieuf1775fb2011-09-06 21:43:51 +00006571 if (LHSType->hasFloatingRepresentation())
6572 CheckFloatComparison(Loc, LHS.get(), RHS.get());
Mike Stumpeed9cac2009-02-19 03:04:26 +00006573
Richard Trieuf1775fb2011-09-06 21:43:51 +00006574 if (LHSType->isArithmeticType() && RHSType->isArithmeticType())
Douglas Gregor447b69e2008-11-19 03:25:36 +00006575 return ResultTy;
Chris Lattnera5937dd2007-08-26 01:18:55 +00006576 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006577
Richard Trieuf1775fb2011-09-06 21:43:51 +00006578 bool LHSIsNull = LHS.get()->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006579 Expr::NPC_ValueDependentIsNull);
Richard Trieuf1775fb2011-09-06 21:43:51 +00006580 bool RHSIsNull = RHS.get()->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006581 Expr::NPC_ValueDependentIsNull);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006582
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006583 // All of the following pointer-related warnings are GCC extensions, except
6584 // when handling null pointer constants.
Richard Trieuf1775fb2011-09-06 21:43:51 +00006585 if (LHSType->isPointerType() && RHSType->isPointerType()) { // C99 6.5.8p2
Chris Lattnerbc896f52008-04-03 05:07:25 +00006586 QualType LCanPointeeTy =
John McCall1d9b3b22011-09-09 05:25:32 +00006587 LHSType->castAs<PointerType>()->getPointeeType().getCanonicalType();
Chris Lattnerbc896f52008-04-03 05:07:25 +00006588 QualType RCanPointeeTy =
John McCall1d9b3b22011-09-09 05:25:32 +00006589 RHSType->castAs<PointerType>()->getPointeeType().getCanonicalType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006590
Douglas Gregor0c6db942009-05-04 06:07:12 +00006591 if (getLangOptions().CPlusPlus) {
Eli Friedman3075e762009-08-23 00:27:47 +00006592 if (LCanPointeeTy == RCanPointeeTy)
6593 return ResultTy;
Richard Trieuccd891a2011-09-09 01:45:06 +00006594 if (!IsRelational &&
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00006595 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
6596 // Valid unless comparison between non-null pointer and function pointer
6597 // This is a gcc extension compatibility comparison.
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006598 // In a SFINAE context, we treat this as a hard error to maintain
6599 // conformance with the C++ standard.
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00006600 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
6601 && !LHSIsNull && !RHSIsNull) {
Richard Trieu7be1be02011-09-02 02:55:45 +00006602 diagnoseFunctionPointerToVoidComparison(
Richard Trieuf1775fb2011-09-06 21:43:51 +00006603 *this, Loc, LHS, RHS, /*isError*/ isSFINAEContext());
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006604
6605 if (isSFINAEContext())
6606 return QualType();
6607
Richard Trieuf1775fb2011-09-06 21:43:51 +00006608 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00006609 return ResultTy;
6610 }
6611 }
Anders Carlsson0c8209e2010-11-04 03:17:43 +00006612
Richard Trieuf1775fb2011-09-06 21:43:51 +00006613 if (convertPointersToCompositeType(*this, Loc, LHS, RHS))
Douglas Gregor0c6db942009-05-04 06:07:12 +00006614 return QualType();
Richard Trieu7be1be02011-09-02 02:55:45 +00006615 else
6616 return ResultTy;
Douglas Gregor0c6db942009-05-04 06:07:12 +00006617 }
Eli Friedman3075e762009-08-23 00:27:47 +00006618 // C99 6.5.9p2 and C99 6.5.8p2
6619 if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(),
6620 RCanPointeeTy.getUnqualifiedType())) {
6621 // Valid unless a relational comparison of function pointers
Richard Trieuccd891a2011-09-09 01:45:06 +00006622 if (IsRelational && LCanPointeeTy->isFunctionType()) {
Eli Friedman3075e762009-08-23 00:27:47 +00006623 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers)
Richard Trieuf1775fb2011-09-06 21:43:51 +00006624 << LHSType << RHSType << LHS.get()->getSourceRange()
6625 << RHS.get()->getSourceRange();
Eli Friedman3075e762009-08-23 00:27:47 +00006626 }
Richard Trieuccd891a2011-09-09 01:45:06 +00006627 } else if (!IsRelational &&
Eli Friedman3075e762009-08-23 00:27:47 +00006628 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
6629 // Valid unless comparison between non-null pointer and function pointer
6630 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
Richard Trieu7be1be02011-09-02 02:55:45 +00006631 && !LHSIsNull && !RHSIsNull)
Richard Trieuf1775fb2011-09-06 21:43:51 +00006632 diagnoseFunctionPointerToVoidComparison(*this, Loc, LHS, RHS,
Richard Trieu7be1be02011-09-02 02:55:45 +00006633 /*isError*/false);
Eli Friedman3075e762009-08-23 00:27:47 +00006634 } else {
6635 // Invalid
Richard Trieuf1775fb2011-09-06 21:43:51 +00006636 diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS, /*isError*/false);
Reid Spencer5f016e22007-07-11 17:01:13 +00006637 }
John McCall34d6f932011-03-11 04:25:25 +00006638 if (LCanPointeeTy != RCanPointeeTy) {
6639 if (LHSIsNull && !RHSIsNull)
Richard Trieuf1775fb2011-09-06 21:43:51 +00006640 LHS = ImpCastExprToType(LHS.take(), RHSType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00006641 else
Richard Trieuf1775fb2011-09-06 21:43:51 +00006642 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00006643 }
Douglas Gregor447b69e2008-11-19 03:25:36 +00006644 return ResultTy;
Steve Naroffe77fd3c2007-08-16 21:48:38 +00006645 }
Mike Stump1eb44332009-09-09 15:08:12 +00006646
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006647 if (getLangOptions().CPlusPlus) {
Anders Carlsson0c8209e2010-11-04 03:17:43 +00006648 // Comparison of nullptr_t with itself.
Richard Trieuf1775fb2011-09-06 21:43:51 +00006649 if (LHSType->isNullPtrType() && RHSType->isNullPtrType())
Anders Carlsson0c8209e2010-11-04 03:17:43 +00006650 return ResultTy;
6651
Mike Stump1eb44332009-09-09 15:08:12 +00006652 // Comparison of pointers with null pointer constants and equality
Douglas Gregor20b3e992009-08-24 17:42:35 +00006653 // comparisons of member pointers to null pointer constants.
Mike Stump1eb44332009-09-09 15:08:12 +00006654 if (RHSIsNull &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006655 ((LHSType->isAnyPointerType() || LHSType->isNullPtrType()) ||
Richard Trieuccd891a2011-09-09 01:45:06 +00006656 (!IsRelational &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006657 (LHSType->isMemberPointerType() || LHSType->isBlockPointerType())))) {
6658 RHS = ImpCastExprToType(RHS.take(), LHSType,
6659 LHSType->isMemberPointerType()
John McCall2de56d12010-08-25 11:45:40 +00006660 ? CK_NullToMemberPointer
John McCall404cd162010-11-13 01:35:44 +00006661 : CK_NullToPointer);
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006662 return ResultTy;
6663 }
Douglas Gregor20b3e992009-08-24 17:42:35 +00006664 if (LHSIsNull &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006665 ((RHSType->isAnyPointerType() || RHSType->isNullPtrType()) ||
Richard Trieuccd891a2011-09-09 01:45:06 +00006666 (!IsRelational &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006667 (RHSType->isMemberPointerType() || RHSType->isBlockPointerType())))) {
6668 LHS = ImpCastExprToType(LHS.take(), RHSType,
6669 RHSType->isMemberPointerType()
John McCall2de56d12010-08-25 11:45:40 +00006670 ? CK_NullToMemberPointer
John McCall404cd162010-11-13 01:35:44 +00006671 : CK_NullToPointer);
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006672 return ResultTy;
6673 }
Douglas Gregor20b3e992009-08-24 17:42:35 +00006674
6675 // Comparison of member pointers.
Richard Trieuccd891a2011-09-09 01:45:06 +00006676 if (!IsRelational &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006677 LHSType->isMemberPointerType() && RHSType->isMemberPointerType()) {
6678 if (convertPointersToCompositeType(*this, Loc, LHS, RHS))
Douglas Gregor20b3e992009-08-24 17:42:35 +00006679 return QualType();
Richard Trieu7be1be02011-09-02 02:55:45 +00006680 else
6681 return ResultTy;
Douglas Gregor20b3e992009-08-24 17:42:35 +00006682 }
Douglas Gregor90566c02011-03-01 17:16:20 +00006683
6684 // Handle scoped enumeration types specifically, since they don't promote
6685 // to integers.
Richard Trieuf1775fb2011-09-06 21:43:51 +00006686 if (LHS.get()->getType()->isEnumeralType() &&
6687 Context.hasSameUnqualifiedType(LHS.get()->getType(),
6688 RHS.get()->getType()))
Douglas Gregor90566c02011-03-01 17:16:20 +00006689 return ResultTy;
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006690 }
Mike Stump1eb44332009-09-09 15:08:12 +00006691
Steve Naroff1c7d0672008-09-04 15:10:53 +00006692 // Handle block pointer types.
Richard Trieuccd891a2011-09-09 01:45:06 +00006693 if (!IsRelational && LHSType->isBlockPointerType() &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006694 RHSType->isBlockPointerType()) {
John McCall1d9b3b22011-09-09 05:25:32 +00006695 QualType lpointee = LHSType->castAs<BlockPointerType>()->getPointeeType();
6696 QualType rpointee = RHSType->castAs<BlockPointerType>()->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006697
Steve Naroff1c7d0672008-09-04 15:10:53 +00006698 if (!LHSIsNull && !RHSIsNull &&
Eli Friedman26784c12009-06-08 05:08:54 +00006699 !Context.typesAreCompatible(lpointee, rpointee)) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00006700 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
Richard Trieuf1775fb2011-09-06 21:43:51 +00006701 << LHSType << RHSType << LHS.get()->getSourceRange()
6702 << RHS.get()->getSourceRange();
Steve Naroff1c7d0672008-09-04 15:10:53 +00006703 }
Richard Trieuf1775fb2011-09-06 21:43:51 +00006704 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006705 return ResultTy;
Steve Naroff1c7d0672008-09-04 15:10:53 +00006706 }
John Wiegley429bb272011-04-08 18:41:53 +00006707
Steve Naroff59f53942008-09-28 01:11:11 +00006708 // Allow block pointers to be compared with null pointer constants.
Richard Trieuccd891a2011-09-09 01:45:06 +00006709 if (!IsRelational
Richard Trieuf1775fb2011-09-06 21:43:51 +00006710 && ((LHSType->isBlockPointerType() && RHSType->isPointerType())
6711 || (LHSType->isPointerType() && RHSType->isBlockPointerType()))) {
Steve Naroff59f53942008-09-28 01:11:11 +00006712 if (!LHSIsNull && !RHSIsNull) {
Richard Trieuf1775fb2011-09-06 21:43:51 +00006713 if (!((RHSType->isPointerType() && RHSType->castAs<PointerType>()
Mike Stumpdd3e1662009-05-07 03:14:14 +00006714 ->getPointeeType()->isVoidType())
Richard Trieuf1775fb2011-09-06 21:43:51 +00006715 || (LHSType->isPointerType() && LHSType->castAs<PointerType>()
Mike Stumpdd3e1662009-05-07 03:14:14 +00006716 ->getPointeeType()->isVoidType())))
6717 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
Richard Trieuf1775fb2011-09-06 21:43:51 +00006718 << LHSType << RHSType << LHS.get()->getSourceRange()
6719 << RHS.get()->getSourceRange();
Steve Naroff59f53942008-09-28 01:11:11 +00006720 }
John McCall34d6f932011-03-11 04:25:25 +00006721 if (LHSIsNull && !RHSIsNull)
John McCall1d9b3b22011-09-09 05:25:32 +00006722 LHS = ImpCastExprToType(LHS.take(), RHSType,
6723 RHSType->isPointerType() ? CK_BitCast
6724 : CK_AnyPointerToBlockPointerCast);
John McCall34d6f932011-03-11 04:25:25 +00006725 else
John McCall1d9b3b22011-09-09 05:25:32 +00006726 RHS = ImpCastExprToType(RHS.take(), LHSType,
6727 LHSType->isPointerType() ? CK_BitCast
6728 : CK_AnyPointerToBlockPointerCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006729 return ResultTy;
Steve Naroff59f53942008-09-28 01:11:11 +00006730 }
Steve Naroff1c7d0672008-09-04 15:10:53 +00006731
Richard Trieuf1775fb2011-09-06 21:43:51 +00006732 if (LHSType->isObjCObjectPointerType() ||
6733 RHSType->isObjCObjectPointerType()) {
6734 const PointerType *LPT = LHSType->getAs<PointerType>();
6735 const PointerType *RPT = RHSType->getAs<PointerType>();
John McCall34d6f932011-03-11 04:25:25 +00006736 if (LPT || RPT) {
6737 bool LPtrToVoid = LPT ? LPT->getPointeeType()->isVoidType() : false;
6738 bool RPtrToVoid = RPT ? RPT->getPointeeType()->isVoidType() : false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006739
Steve Naroffa8069f12008-11-17 19:49:16 +00006740 if (!LPtrToVoid && !RPtrToVoid &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006741 !Context.typesAreCompatible(LHSType, RHSType)) {
6742 diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS,
Richard Trieu7be1be02011-09-02 02:55:45 +00006743 /*isError*/false);
Steve Naroffa5ad8632008-10-27 10:33:19 +00006744 }
John McCall34d6f932011-03-11 04:25:25 +00006745 if (LHSIsNull && !RHSIsNull)
John McCall1d9b3b22011-09-09 05:25:32 +00006746 LHS = ImpCastExprToType(LHS.take(), RHSType,
6747 RPT ? CK_BitCast :CK_CPointerToObjCPointerCast);
John McCall34d6f932011-03-11 04:25:25 +00006748 else
John McCall1d9b3b22011-09-09 05:25:32 +00006749 RHS = ImpCastExprToType(RHS.take(), LHSType,
6750 LPT ? CK_BitCast :CK_CPointerToObjCPointerCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006751 return ResultTy;
Steve Naroff87f3b932008-10-20 18:19:10 +00006752 }
Richard Trieuf1775fb2011-09-06 21:43:51 +00006753 if (LHSType->isObjCObjectPointerType() &&
6754 RHSType->isObjCObjectPointerType()) {
6755 if (!Context.areComparableObjCPointerTypes(LHSType, RHSType))
6756 diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS,
Richard Trieu7be1be02011-09-02 02:55:45 +00006757 /*isError*/false);
John McCall34d6f932011-03-11 04:25:25 +00006758 if (LHSIsNull && !RHSIsNull)
Richard Trieuf1775fb2011-09-06 21:43:51 +00006759 LHS = ImpCastExprToType(LHS.take(), RHSType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00006760 else
Richard Trieuf1775fb2011-09-06 21:43:51 +00006761 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006762 return ResultTy;
Steve Naroff20373222008-06-03 14:04:54 +00006763 }
Fariborz Jahanian7359f042007-12-20 01:06:58 +00006764 }
Richard Trieuf1775fb2011-09-06 21:43:51 +00006765 if ((LHSType->isAnyPointerType() && RHSType->isIntegerType()) ||
6766 (LHSType->isIntegerType() && RHSType->isAnyPointerType())) {
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006767 unsigned DiagID = 0;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006768 bool isError = false;
Richard Trieuf1775fb2011-09-06 21:43:51 +00006769 if ((LHSIsNull && LHSType->isIntegerType()) ||
6770 (RHSIsNull && RHSType->isIntegerType())) {
Richard Trieuccd891a2011-09-09 01:45:06 +00006771 if (IsRelational && !getLangOptions().CPlusPlus)
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006772 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero;
Richard Trieuccd891a2011-09-09 01:45:06 +00006773 } else if (IsRelational && !getLangOptions().CPlusPlus)
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006774 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006775 else if (getLangOptions().CPlusPlus) {
6776 DiagID = diag::err_typecheck_comparison_of_pointer_integer;
6777 isError = true;
6778 } else
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006779 DiagID = diag::ext_typecheck_comparison_of_pointer_integer;
Mike Stump1eb44332009-09-09 15:08:12 +00006780
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006781 if (DiagID) {
Chris Lattner6365e3e2009-08-22 18:58:31 +00006782 Diag(Loc, DiagID)
Richard Trieuf1775fb2011-09-06 21:43:51 +00006783 << LHSType << RHSType << LHS.get()->getSourceRange()
6784 << RHS.get()->getSourceRange();
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006785 if (isError)
6786 return QualType();
Chris Lattner6365e3e2009-08-22 18:58:31 +00006787 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006788
Richard Trieuf1775fb2011-09-06 21:43:51 +00006789 if (LHSType->isIntegerType())
6790 LHS = ImpCastExprToType(LHS.take(), RHSType,
John McCall404cd162010-11-13 01:35:44 +00006791 LHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006792 else
Richard Trieuf1775fb2011-09-06 21:43:51 +00006793 RHS = ImpCastExprToType(RHS.take(), LHSType,
John McCall404cd162010-11-13 01:35:44 +00006794 RHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006795 return ResultTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00006796 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006797
Steve Naroff39218df2008-09-04 16:56:14 +00006798 // Handle block pointers.
Richard Trieuccd891a2011-09-09 01:45:06 +00006799 if (!IsRelational && RHSIsNull
Richard Trieuf1775fb2011-09-06 21:43:51 +00006800 && LHSType->isBlockPointerType() && RHSType->isIntegerType()) {
6801 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_NullToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006802 return ResultTy;
Steve Naroff39218df2008-09-04 16:56:14 +00006803 }
Richard Trieuccd891a2011-09-09 01:45:06 +00006804 if (!IsRelational && LHSIsNull
Richard Trieuf1775fb2011-09-06 21:43:51 +00006805 && LHSType->isIntegerType() && RHSType->isBlockPointerType()) {
6806 LHS = ImpCastExprToType(LHS.take(), RHSType, CK_NullToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006807 return ResultTy;
Steve Naroff39218df2008-09-04 16:56:14 +00006808 }
Douglas Gregor90566c02011-03-01 17:16:20 +00006809
Richard Trieuf1775fb2011-09-06 21:43:51 +00006810 return InvalidOperands(Loc, LHS, RHS);
Reid Spencer5f016e22007-07-11 17:01:13 +00006811}
6812
Nate Begemanbe2341d2008-07-14 18:02:46 +00006813/// CheckVectorCompareOperands - vector comparisons are a clang extension that
Mike Stumpeed9cac2009-02-19 03:04:26 +00006814/// operates on extended vector types. Instead of producing an IntTy result,
Nate Begemanbe2341d2008-07-14 18:02:46 +00006815/// like a scalar comparison, a vector comparison produces a vector of integer
6816/// types.
Richard Trieu9f60dee2011-09-07 01:19:57 +00006817QualType Sema::CheckVectorCompareOperands(ExprResult &LHS, ExprResult &RHS,
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006818 SourceLocation Loc,
Richard Trieuccd891a2011-09-09 01:45:06 +00006819 bool IsRelational) {
Nate Begemanbe2341d2008-07-14 18:02:46 +00006820 // Check to make sure we're operating on vectors of the same type and width,
6821 // Allowing one side to be a scalar of element type.
Richard Trieu9f60dee2011-09-07 01:19:57 +00006822 QualType vType = CheckVectorOperands(LHS, RHS, Loc, /*isCompAssign*/false);
Nate Begemanbe2341d2008-07-14 18:02:46 +00006823 if (vType.isNull())
6824 return vType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006825
Richard Trieu9f60dee2011-09-07 01:19:57 +00006826 QualType LHSType = LHS.get()->getType();
6827 QualType RHSType = RHS.get()->getType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006828
Anton Yartsev7870b132011-03-27 15:36:07 +00006829 // If AltiVec, the comparison results in a numeric type, i.e.
6830 // bool for C++, int for C
Anton Yartsev6305f722011-03-28 21:00:05 +00006831 if (vType->getAs<VectorType>()->getVectorKind() == VectorType::AltiVecVector)
Anton Yartsev7870b132011-03-27 15:36:07 +00006832 return Context.getLogicalOperationType();
6833
Nate Begemanbe2341d2008-07-14 18:02:46 +00006834 // For non-floating point types, check for self-comparisons of the form
6835 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
6836 // often indicate logic errors in the program.
Richard Trieu9f60dee2011-09-07 01:19:57 +00006837 if (!LHSType->hasFloatingRepresentation()) {
Richard Smith9c129f82011-10-28 03:31:48 +00006838 if (DeclRefExpr* DRL
6839 = dyn_cast<DeclRefExpr>(LHS.get()->IgnoreParenImpCasts()))
6840 if (DeclRefExpr* DRR
6841 = dyn_cast<DeclRefExpr>(RHS.get()->IgnoreParenImpCasts()))
Nate Begemanbe2341d2008-07-14 18:02:46 +00006842 if (DRL->getDecl() == DRR->getDecl())
Ted Kremenek351ba912011-02-23 01:52:04 +00006843 DiagRuntimeBehavior(Loc, 0,
Douglas Gregord64fdd02010-06-08 19:50:34 +00006844 PDiag(diag::warn_comparison_always)
6845 << 0 // self-
6846 << 2 // "a constant"
6847 );
Nate Begemanbe2341d2008-07-14 18:02:46 +00006848 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006849
Nate Begemanbe2341d2008-07-14 18:02:46 +00006850 // Check for comparisons of floating point operands using != and ==.
Richard Trieuccd891a2011-09-09 01:45:06 +00006851 if (!IsRelational && LHSType->hasFloatingRepresentation()) {
Richard Trieu9f60dee2011-09-07 01:19:57 +00006852 assert (RHSType->hasFloatingRepresentation());
6853 CheckFloatComparison(Loc, LHS.get(), RHS.get());
Nate Begemanbe2341d2008-07-14 18:02:46 +00006854 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006855
Tanya Lattner6ec96432011-10-17 21:00:38 +00006856 // Return a signed type that is of identical size and number of elements.
6857 // For floating point vectors, return an integer type of identical size
6858 // and number of elements.
Richard Trieu9f60dee2011-09-07 01:19:57 +00006859 const VectorType *VTy = LHSType->getAs<VectorType>();
Nate Begemanbe2341d2008-07-14 18:02:46 +00006860 unsigned TypeSize = Context.getTypeSize(VTy->getElementType());
Tanya Lattner6ec96432011-10-17 21:00:38 +00006861 if (TypeSize == Context.getTypeSize(Context.CharTy))
6862 return Context.getExtVectorType(Context.CharTy, VTy->getNumElements());
6863 else if (TypeSize == Context.getTypeSize(Context.ShortTy))
6864 return Context.getExtVectorType(Context.ShortTy, VTy->getNumElements());
6865 else if (TypeSize == Context.getTypeSize(Context.IntTy))
Nate Begemanbe2341d2008-07-14 18:02:46 +00006866 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements());
Tanya Lattner6ec96432011-10-17 21:00:38 +00006867 else if (TypeSize == Context.getTypeSize(Context.LongTy))
Nate Begeman59b5da62009-01-18 03:20:47 +00006868 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements());
Mike Stumpeed9cac2009-02-19 03:04:26 +00006869 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) &&
Nate Begeman59b5da62009-01-18 03:20:47 +00006870 "Unhandled vector element size in vector compare");
Nate Begemanbe2341d2008-07-14 18:02:46 +00006871 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements());
6872}
6873
Reid Spencer5f016e22007-07-11 17:01:13 +00006874inline QualType Sema::CheckBitwiseOperands(
Richard Trieuccd891a2011-09-09 01:45:06 +00006875 ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign) {
Richard Trieu481037f2011-09-16 00:53:10 +00006876 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
6877
Richard Trieu9f60dee2011-09-07 01:19:57 +00006878 if (LHS.get()->getType()->isVectorType() ||
6879 RHS.get()->getType()->isVectorType()) {
6880 if (LHS.get()->getType()->hasIntegerRepresentation() &&
6881 RHS.get()->getType()->hasIntegerRepresentation())
Richard Trieuccd891a2011-09-09 01:45:06 +00006882 return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign);
Douglas Gregorf6094622010-07-23 15:58:24 +00006883
Richard Trieu9f60dee2011-09-07 01:19:57 +00006884 return InvalidOperands(Loc, LHS, RHS);
Douglas Gregorf6094622010-07-23 15:58:24 +00006885 }
Steve Naroff90045e82007-07-13 23:32:42 +00006886
Richard Trieu9f60dee2011-09-07 01:19:57 +00006887 ExprResult LHSResult = Owned(LHS), RHSResult = Owned(RHS);
6888 QualType compType = UsualArithmeticConversions(LHSResult, RHSResult,
Richard Trieuccd891a2011-09-09 01:45:06 +00006889 IsCompAssign);
Richard Trieu9f60dee2011-09-07 01:19:57 +00006890 if (LHSResult.isInvalid() || RHSResult.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006891 return QualType();
Richard Trieu9f60dee2011-09-07 01:19:57 +00006892 LHS = LHSResult.take();
6893 RHS = RHSResult.take();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006894
Richard Trieu9f60dee2011-09-07 01:19:57 +00006895 if (LHS.get()->getType()->isIntegralOrUnscopedEnumerationType() &&
6896 RHS.get()->getType()->isIntegralOrUnscopedEnumerationType())
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00006897 return compType;
Richard Trieu9f60dee2011-09-07 01:19:57 +00006898 return InvalidOperands(Loc, LHS, RHS);
Reid Spencer5f016e22007-07-11 17:01:13 +00006899}
6900
6901inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14]
Richard Trieu9f60dee2011-09-07 01:19:57 +00006902 ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, unsigned Opc) {
Chris Lattner90a8f272010-07-13 19:41:32 +00006903
6904 // Diagnose cases where the user write a logical and/or but probably meant a
6905 // bitwise one. We do this when the LHS is a non-bool integer and the RHS
6906 // is a constant.
Richard Trieu9f60dee2011-09-07 01:19:57 +00006907 if (LHS.get()->getType()->isIntegerType() &&
6908 !LHS.get()->getType()->isBooleanType() &&
6909 RHS.get()->getType()->isIntegerType() && !RHS.get()->isValueDependent() &&
Richard Trieue5adf592011-07-15 00:00:51 +00006910 // Don't warn in macros or template instantiations.
6911 !Loc.isMacroID() && ActiveTemplateInstantiations.empty()) {
Chris Lattnerb7690b42010-07-24 01:10:11 +00006912 // If the RHS can be constant folded, and if it constant folds to something
6913 // that isn't 0 or 1 (which indicate a potential logical operation that
6914 // happened to fold to true/false) then warn.
Chandler Carruth0683a142011-05-31 05:41:42 +00006915 // Parens on the RHS are ignored.
Richard Smith909c5552011-10-16 23:01:09 +00006916 llvm::APSInt Result;
6917 if (RHS.get()->EvaluateAsInt(Result, Context))
Richard Trieu9f60dee2011-09-07 01:19:57 +00006918 if ((getLangOptions().Bool && !RHS.get()->getType()->isBooleanType()) ||
Richard Smith909c5552011-10-16 23:01:09 +00006919 (Result != 0 && Result != 1)) {
Chandler Carruth0683a142011-05-31 05:41:42 +00006920 Diag(Loc, diag::warn_logical_instead_of_bitwise)
Richard Trieu9f60dee2011-09-07 01:19:57 +00006921 << RHS.get()->getSourceRange()
Matt Beaumont-Gay9b127f32011-08-15 17:50:06 +00006922 << (Opc == BO_LAnd ? "&&" : "||");
6923 // Suggest replacing the logical operator with the bitwise version
6924 Diag(Loc, diag::note_logical_instead_of_bitwise_change_operator)
6925 << (Opc == BO_LAnd ? "&" : "|")
6926 << FixItHint::CreateReplacement(SourceRange(
6927 Loc, Lexer::getLocForEndOfToken(Loc, 0, getSourceManager(),
6928 getLangOptions())),
6929 Opc == BO_LAnd ? "&" : "|");
6930 if (Opc == BO_LAnd)
6931 // Suggest replacing "Foo() && kNonZero" with "Foo()"
6932 Diag(Loc, diag::note_logical_instead_of_bitwise_remove_constant)
6933 << FixItHint::CreateRemoval(
6934 SourceRange(
Richard Trieu9f60dee2011-09-07 01:19:57 +00006935 Lexer::getLocForEndOfToken(LHS.get()->getLocEnd(),
Matt Beaumont-Gay9b127f32011-08-15 17:50:06 +00006936 0, getSourceManager(),
6937 getLangOptions()),
Richard Trieu9f60dee2011-09-07 01:19:57 +00006938 RHS.get()->getLocEnd()));
Matt Beaumont-Gay9b127f32011-08-15 17:50:06 +00006939 }
Chris Lattnerb7690b42010-07-24 01:10:11 +00006940 }
Chris Lattner90a8f272010-07-13 19:41:32 +00006941
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006942 if (!Context.getLangOptions().CPlusPlus) {
Richard Trieu9f60dee2011-09-07 01:19:57 +00006943 LHS = UsualUnaryConversions(LHS.take());
6944 if (LHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006945 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006946
Richard Trieu9f60dee2011-09-07 01:19:57 +00006947 RHS = UsualUnaryConversions(RHS.take());
6948 if (RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006949 return QualType();
6950
Richard Trieu9f60dee2011-09-07 01:19:57 +00006951 if (!LHS.get()->getType()->isScalarType() ||
6952 !RHS.get()->getType()->isScalarType())
6953 return InvalidOperands(Loc, LHS, RHS);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006954
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006955 return Context.IntTy;
Anders Carlsson04905012009-10-16 01:44:21 +00006956 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006957
John McCall75f7c0f2010-06-04 00:29:51 +00006958 // The following is safe because we only use this method for
6959 // non-overloadable operands.
6960
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006961 // C++ [expr.log.and]p1
6962 // C++ [expr.log.or]p1
John McCall75f7c0f2010-06-04 00:29:51 +00006963 // The operands are both contextually converted to type bool.
Richard Trieu9f60dee2011-09-07 01:19:57 +00006964 ExprResult LHSRes = PerformContextuallyConvertToBool(LHS.get());
6965 if (LHSRes.isInvalid())
6966 return InvalidOperands(Loc, LHS, RHS);
6967 LHS = move(LHSRes);
John Wiegley429bb272011-04-08 18:41:53 +00006968
Richard Trieu9f60dee2011-09-07 01:19:57 +00006969 ExprResult RHSRes = PerformContextuallyConvertToBool(RHS.get());
6970 if (RHSRes.isInvalid())
6971 return InvalidOperands(Loc, LHS, RHS);
6972 RHS = move(RHSRes);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006973
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006974 // C++ [expr.log.and]p2
6975 // C++ [expr.log.or]p2
6976 // The result is a bool.
6977 return Context.BoolTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00006978}
6979
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00006980/// IsReadonlyProperty - Verify that otherwise a valid l-value expression
6981/// is a read-only property; return true if so. A readonly property expression
6982/// depends on various declarations and thus must be treated specially.
6983///
Mike Stump1eb44332009-09-09 15:08:12 +00006984static bool IsReadonlyProperty(Expr *E, Sema &S) {
John McCall3c3b7f92011-10-25 17:37:35 +00006985 const ObjCPropertyRefExpr *PropExpr = dyn_cast<ObjCPropertyRefExpr>(E);
6986 if (!PropExpr) return false;
6987 if (PropExpr->isImplicitProperty()) return false;
John McCall12f78a62010-12-02 01:19:52 +00006988
John McCall3c3b7f92011-10-25 17:37:35 +00006989 ObjCPropertyDecl *PDecl = PropExpr->getExplicitProperty();
6990 QualType BaseType = PropExpr->isSuperReceiver() ?
John McCall12f78a62010-12-02 01:19:52 +00006991 PropExpr->getSuperReceiverType() :
Fariborz Jahanian8ac2d442010-10-14 16:04:05 +00006992 PropExpr->getBase()->getType();
6993
John McCall3c3b7f92011-10-25 17:37:35 +00006994 if (const ObjCObjectPointerType *OPT =
6995 BaseType->getAsObjCInterfacePointerType())
6996 if (ObjCInterfaceDecl *IFace = OPT->getInterfaceDecl())
6997 if (S.isPropertyReadonly(PDecl, IFace))
6998 return true;
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00006999 return false;
7000}
7001
Fariborz Jahanian14086762011-03-28 23:47:18 +00007002static bool IsConstProperty(Expr *E, Sema &S) {
John McCall3c3b7f92011-10-25 17:37:35 +00007003 const ObjCPropertyRefExpr *PropExpr = dyn_cast<ObjCPropertyRefExpr>(E);
7004 if (!PropExpr) return false;
7005 if (PropExpr->isImplicitProperty()) return false;
Fariborz Jahanian14086762011-03-28 23:47:18 +00007006
John McCall3c3b7f92011-10-25 17:37:35 +00007007 ObjCPropertyDecl *PDecl = PropExpr->getExplicitProperty();
7008 QualType T = PDecl->getType().getNonReferenceType();
7009 return T.isConstQualified();
Fariborz Jahanian14086762011-03-28 23:47:18 +00007010}
7011
Fariborz Jahanian077f4902011-03-26 19:48:30 +00007012static bool IsReadonlyMessage(Expr *E, Sema &S) {
John McCall3c3b7f92011-10-25 17:37:35 +00007013 const MemberExpr *ME = dyn_cast<MemberExpr>(E);
7014 if (!ME) return false;
7015 if (!isa<FieldDecl>(ME->getMemberDecl())) return false;
7016 ObjCMessageExpr *Base =
7017 dyn_cast<ObjCMessageExpr>(ME->getBase()->IgnoreParenImpCasts());
7018 if (!Base) return false;
7019 return Base->getMethodDecl() != 0;
Fariborz Jahanian077f4902011-03-26 19:48:30 +00007020}
7021
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007022/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not,
7023/// emit an error and return true. If so, return false.
7024static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) {
Daniel Dunbar44e35f72009-04-15 00:08:05 +00007025 SourceLocation OrigLoc = Loc;
Mike Stump1eb44332009-09-09 15:08:12 +00007026 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context,
Daniel Dunbar44e35f72009-04-15 00:08:05 +00007027 &Loc);
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00007028 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S))
7029 IsLV = Expr::MLV_ReadonlyProperty;
Fariborz Jahanian14086762011-03-28 23:47:18 +00007030 else if (Expr::MLV_ConstQualified && IsConstProperty(E, S))
7031 IsLV = Expr::MLV_Valid;
Fariborz Jahanian077f4902011-03-26 19:48:30 +00007032 else if (IsLV == Expr::MLV_ClassTemporary && IsReadonlyMessage(E, S))
7033 IsLV = Expr::MLV_InvalidMessageExpression;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007034 if (IsLV == Expr::MLV_Valid)
7035 return false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00007036
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007037 unsigned Diag = 0;
7038 bool NeedType = false;
7039 switch (IsLV) { // C99 6.5.16p2
John McCallf85e1932011-06-15 23:02:42 +00007040 case Expr::MLV_ConstQualified:
7041 Diag = diag::err_typecheck_assign_const;
7042
John McCall7acddac2011-06-17 06:42:21 +00007043 // In ARC, use some specialized diagnostics for occasions where we
7044 // infer 'const'. These are always pseudo-strong variables.
John McCallf85e1932011-06-15 23:02:42 +00007045 if (S.getLangOptions().ObjCAutoRefCount) {
7046 DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts());
7047 if (declRef && isa<VarDecl>(declRef->getDecl())) {
7048 VarDecl *var = cast<VarDecl>(declRef->getDecl());
7049
John McCall7acddac2011-06-17 06:42:21 +00007050 // Use the normal diagnostic if it's pseudo-__strong but the
7051 // user actually wrote 'const'.
7052 if (var->isARCPseudoStrong() &&
7053 (!var->getTypeSourceInfo() ||
7054 !var->getTypeSourceInfo()->getType().isConstQualified())) {
7055 // There are two pseudo-strong cases:
7056 // - self
John McCallf85e1932011-06-15 23:02:42 +00007057 ObjCMethodDecl *method = S.getCurMethodDecl();
7058 if (method && var == method->getSelfDecl())
7059 Diag = diag::err_typecheck_arr_assign_self;
John McCall7acddac2011-06-17 06:42:21 +00007060
7061 // - fast enumeration variables
7062 else
John McCallf85e1932011-06-15 23:02:42 +00007063 Diag = diag::err_typecheck_arr_assign_enumeration;
John McCall7acddac2011-06-17 06:42:21 +00007064
John McCallf85e1932011-06-15 23:02:42 +00007065 SourceRange Assign;
7066 if (Loc != OrigLoc)
7067 Assign = SourceRange(OrigLoc, OrigLoc);
7068 S.Diag(Loc, Diag) << E->getSourceRange() << Assign;
7069 // We need to preserve the AST regardless, so migration tool
7070 // can do its job.
7071 return false;
7072 }
7073 }
7074 }
7075
7076 break;
Mike Stumpeed9cac2009-02-19 03:04:26 +00007077 case Expr::MLV_ArrayType:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007078 Diag = diag::err_typecheck_array_not_modifiable_lvalue;
7079 NeedType = true;
7080 break;
Mike Stumpeed9cac2009-02-19 03:04:26 +00007081 case Expr::MLV_NotObjectType:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007082 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue;
7083 NeedType = true;
7084 break;
Chris Lattnerca354fa2008-11-17 19:51:54 +00007085 case Expr::MLV_LValueCast:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007086 Diag = diag::err_typecheck_lvalue_casts_not_supported;
7087 break;
Douglas Gregore873fb72010-02-16 21:39:57 +00007088 case Expr::MLV_Valid:
7089 llvm_unreachable("did not take early return for MLV_Valid");
Chris Lattner5cf216b2008-01-04 18:04:52 +00007090 case Expr::MLV_InvalidExpression:
Douglas Gregore873fb72010-02-16 21:39:57 +00007091 case Expr::MLV_MemberFunction:
7092 case Expr::MLV_ClassTemporary:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007093 Diag = diag::err_typecheck_expression_not_modifiable_lvalue;
7094 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00007095 case Expr::MLV_IncompleteType:
7096 case Expr::MLV_IncompleteVoidType:
Douglas Gregor86447ec2009-03-09 16:13:40 +00007097 return S.RequireCompleteType(Loc, E->getType(),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00007098 S.PDiag(diag::err_typecheck_incomplete_type_not_modifiable_lvalue)
Anders Carlssonb7906612009-08-26 23:45:07 +00007099 << E->getSourceRange());
Chris Lattner5cf216b2008-01-04 18:04:52 +00007100 case Expr::MLV_DuplicateVectorComponents:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007101 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue;
7102 break;
Steve Naroff4f6a7d72008-09-26 14:41:28 +00007103 case Expr::MLV_NotBlockQualified:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007104 Diag = diag::err_block_decl_ref_not_modifiable_lvalue;
7105 break;
Fariborz Jahanian5daf5702008-11-22 18:39:36 +00007106 case Expr::MLV_ReadonlyProperty:
Fariborz Jahanianba8d2d62008-11-22 20:25:50 +00007107 case Expr::MLV_NoSetterProperty:
John McCall3c3b7f92011-10-25 17:37:35 +00007108 llvm_unreachable("readonly properties should be processed differently");
Fariborz Jahanianba8d2d62008-11-22 20:25:50 +00007109 break;
Fariborz Jahanian077f4902011-03-26 19:48:30 +00007110 case Expr::MLV_InvalidMessageExpression:
7111 Diag = diag::error_readonly_message_assignment;
7112 break;
Fariborz Jahanian2514a302009-12-15 23:59:41 +00007113 case Expr::MLV_SubObjCPropertySetting:
7114 Diag = diag::error_no_subobject_property_setting;
7115 break;
Reid Spencer5f016e22007-07-11 17:01:13 +00007116 }
Steve Naroffd1861fd2007-07-31 12:34:36 +00007117
Daniel Dunbar44e35f72009-04-15 00:08:05 +00007118 SourceRange Assign;
7119 if (Loc != OrigLoc)
7120 Assign = SourceRange(OrigLoc, OrigLoc);
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007121 if (NeedType)
Daniel Dunbar44e35f72009-04-15 00:08:05 +00007122 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007123 else
Mike Stump1eb44332009-09-09 15:08:12 +00007124 S.Diag(Loc, Diag) << E->getSourceRange() << Assign;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007125 return true;
7126}
7127
7128
7129
7130// C99 6.5.16.1
Richard Trieu268942b2011-09-07 01:33:52 +00007131QualType Sema::CheckAssignmentOperands(Expr *LHSExpr, ExprResult &RHS,
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007132 SourceLocation Loc,
7133 QualType CompoundType) {
John McCall3c3b7f92011-10-25 17:37:35 +00007134 assert(!LHSExpr->hasPlaceholderType(BuiltinType::PseudoObject));
7135
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007136 // Verify that LHS is a modifiable lvalue, and emit error if not.
Richard Trieu268942b2011-09-07 01:33:52 +00007137 if (CheckForModifiableLvalue(LHSExpr, Loc, *this))
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007138 return QualType();
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007139
Richard Trieu268942b2011-09-07 01:33:52 +00007140 QualType LHSType = LHSExpr->getType();
Richard Trieu67e29332011-08-02 04:35:43 +00007141 QualType RHSType = CompoundType.isNull() ? RHS.get()->getType() :
7142 CompoundType;
Chris Lattner5cf216b2008-01-04 18:04:52 +00007143 AssignConvertType ConvTy;
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007144 if (CompoundType.isNull()) {
Fariborz Jahaniane2a901a2010-06-07 22:02:01 +00007145 QualType LHSTy(LHSType);
Fariborz Jahaniane2a901a2010-06-07 22:02:01 +00007146 ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
John Wiegley429bb272011-04-08 18:41:53 +00007147 if (RHS.isInvalid())
7148 return QualType();
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00007149 // Special case of NSObject attributes on c-style pointer types.
7150 if (ConvTy == IncompatiblePointer &&
7151 ((Context.isObjCNSObjectType(LHSType) &&
Steve Narofff4954562009-07-16 15:41:00 +00007152 RHSType->isObjCObjectPointerType()) ||
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00007153 (Context.isObjCNSObjectType(RHSType) &&
Steve Narofff4954562009-07-16 15:41:00 +00007154 LHSType->isObjCObjectPointerType())))
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00007155 ConvTy = Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00007156
John McCallf89e55a2010-11-18 06:31:45 +00007157 if (ConvTy == Compatible &&
7158 getLangOptions().ObjCNonFragileABI &&
7159 LHSType->isObjCObjectType())
7160 Diag(Loc, diag::err_assignment_requires_nonfragile_object)
7161 << LHSType;
7162
Chris Lattner2c156472008-08-21 18:04:13 +00007163 // If the RHS is a unary plus or minus, check to see if they = and + are
7164 // right next to each other. If so, the user may have typo'd "x =+ 4"
7165 // instead of "x += 4".
John Wiegley429bb272011-04-08 18:41:53 +00007166 Expr *RHSCheck = RHS.get();
Chris Lattner2c156472008-08-21 18:04:13 +00007167 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck))
7168 RHSCheck = ICE->getSubExpr();
7169 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) {
John McCall2de56d12010-08-25 11:45:40 +00007170 if ((UO->getOpcode() == UO_Plus ||
7171 UO->getOpcode() == UO_Minus) &&
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007172 Loc.isFileID() && UO->getOperatorLoc().isFileID() &&
Chris Lattner2c156472008-08-21 18:04:13 +00007173 // Only if the two operators are exactly adjacent.
Argyrios Kyrtzidisa64ccef2011-09-19 20:40:19 +00007174 Loc.getLocWithOffset(1) == UO->getOperatorLoc() &&
Chris Lattner399bd1b2009-03-08 06:51:10 +00007175 // And there is a space or other character before the subexpr of the
7176 // unary +/-. We don't want to warn on "x=-1".
Argyrios Kyrtzidisa64ccef2011-09-19 20:40:19 +00007177 Loc.getLocWithOffset(2) != UO->getSubExpr()->getLocStart() &&
Chris Lattner3e872092009-03-09 07:11:10 +00007178 UO->getSubExpr()->getLocStart().isFileID()) {
Chris Lattnerd3a94e22008-11-20 06:06:08 +00007179 Diag(Loc, diag::warn_not_compound_assign)
John McCall2de56d12010-08-25 11:45:40 +00007180 << (UO->getOpcode() == UO_Plus ? "+" : "-")
Chris Lattnerd3a94e22008-11-20 06:06:08 +00007181 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc());
Chris Lattner399bd1b2009-03-08 06:51:10 +00007182 }
Chris Lattner2c156472008-08-21 18:04:13 +00007183 }
John McCallf85e1932011-06-15 23:02:42 +00007184
7185 if (ConvTy == Compatible) {
7186 if (LHSType.getObjCLifetime() == Qualifiers::OCL_Strong)
Richard Trieu268942b2011-09-07 01:33:52 +00007187 checkRetainCycles(LHSExpr, RHS.get());
Fariborz Jahanian921c1432011-06-24 18:25:34 +00007188 else if (getLangOptions().ObjCAutoRefCount)
Richard Trieu268942b2011-09-07 01:33:52 +00007189 checkUnsafeExprAssigns(Loc, LHSExpr, RHS.get());
John McCallf85e1932011-06-15 23:02:42 +00007190 }
Chris Lattner2c156472008-08-21 18:04:13 +00007191 } else {
7192 // Compound assignment "x += y"
Douglas Gregorb608b982011-01-28 02:26:04 +00007193 ConvTy = CheckAssignmentConstraints(Loc, LHSType, RHSType);
Chris Lattner2c156472008-08-21 18:04:13 +00007194 }
Chris Lattner5cf216b2008-01-04 18:04:52 +00007195
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007196 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType,
John Wiegley429bb272011-04-08 18:41:53 +00007197 RHS.get(), AA_Assigning))
Chris Lattner5cf216b2008-01-04 18:04:52 +00007198 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007199
Richard Trieu268942b2011-09-07 01:33:52 +00007200 CheckForNullPointerDereference(*this, LHSExpr);
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00007201
Reid Spencer5f016e22007-07-11 17:01:13 +00007202 // C99 6.5.16p3: The type of an assignment expression is the type of the
7203 // left operand unless the left operand has qualified type, in which case
Mike Stumpeed9cac2009-02-19 03:04:26 +00007204 // it is the unqualified version of the type of the left operand.
Reid Spencer5f016e22007-07-11 17:01:13 +00007205 // C99 6.5.16.1p2: In simple assignment, the value of the right operand
7206 // is converted to the type of the assignment expression (above).
Chris Lattner73d0d4f2007-08-30 17:45:32 +00007207 // C++ 5.17p1: the type of the assignment expression is that of its left
Douglas Gregor2d833e32009-05-02 00:36:19 +00007208 // operand.
John McCall2bf6f492010-10-12 02:19:57 +00007209 return (getLangOptions().CPlusPlus
7210 ? LHSType : LHSType.getUnqualifiedType());
Reid Spencer5f016e22007-07-11 17:01:13 +00007211}
7212
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007213// C99 6.5.17
John Wiegley429bb272011-04-08 18:41:53 +00007214static QualType CheckCommaOperands(Sema &S, ExprResult &LHS, ExprResult &RHS,
John McCall09431682010-11-18 19:01:18 +00007215 SourceLocation Loc) {
John Wiegley429bb272011-04-08 18:41:53 +00007216 S.DiagnoseUnusedExprResult(LHS.get());
Argyrios Kyrtzidis25973452010-06-30 10:53:14 +00007217
John McCallfb8721c2011-04-10 19:13:55 +00007218 LHS = S.CheckPlaceholderExpr(LHS.take());
7219 RHS = S.CheckPlaceholderExpr(RHS.take());
John Wiegley429bb272011-04-08 18:41:53 +00007220 if (LHS.isInvalid() || RHS.isInvalid())
Douglas Gregor7ad5d422010-11-09 21:07:58 +00007221 return QualType();
7222
John McCallcf2e5062010-10-12 07:14:40 +00007223 // C's comma performs lvalue conversion (C99 6.3.2.1) on both its
7224 // operands, but not unary promotions.
7225 // C++'s comma does not do any conversions at all (C++ [expr.comma]p1).
Eli Friedmanb1d796d2009-03-23 00:24:07 +00007226
John McCallf6a16482010-12-04 03:47:34 +00007227 // So we treat the LHS as a ignored value, and in C++ we allow the
7228 // containing site to determine what should be done with the RHS.
John Wiegley429bb272011-04-08 18:41:53 +00007229 LHS = S.IgnoredValueConversions(LHS.take());
7230 if (LHS.isInvalid())
7231 return QualType();
John McCallf6a16482010-12-04 03:47:34 +00007232
7233 if (!S.getLangOptions().CPlusPlus) {
John Wiegley429bb272011-04-08 18:41:53 +00007234 RHS = S.DefaultFunctionArrayLvalueConversion(RHS.take());
7235 if (RHS.isInvalid())
7236 return QualType();
7237 if (!RHS.get()->getType()->isVoidType())
Richard Trieu67e29332011-08-02 04:35:43 +00007238 S.RequireCompleteType(Loc, RHS.get()->getType(),
7239 diag::err_incomplete_type);
John McCallcf2e5062010-10-12 07:14:40 +00007240 }
Eli Friedmanb1d796d2009-03-23 00:24:07 +00007241
John Wiegley429bb272011-04-08 18:41:53 +00007242 return RHS.get()->getType();
Reid Spencer5f016e22007-07-11 17:01:13 +00007243}
7244
Steve Naroff49b45262007-07-13 16:58:59 +00007245/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine
7246/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions.
John McCall09431682010-11-18 19:01:18 +00007247static QualType CheckIncrementDecrementOperand(Sema &S, Expr *Op,
7248 ExprValueKind &VK,
7249 SourceLocation OpLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00007250 bool IsInc, bool IsPrefix) {
Sebastian Redl28507842009-02-26 14:39:58 +00007251 if (Op->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00007252 return S.Context.DependentTy;
Sebastian Redl28507842009-02-26 14:39:58 +00007253
Chris Lattner3528d352008-11-21 07:05:48 +00007254 QualType ResType = Op->getType();
7255 assert(!ResType.isNull() && "no type for increment/decrement expression");
Reid Spencer5f016e22007-07-11 17:01:13 +00007256
John McCall09431682010-11-18 19:01:18 +00007257 if (S.getLangOptions().CPlusPlus && ResType->isBooleanType()) {
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00007258 // Decrement of bool is not allowed.
Richard Trieuccd891a2011-09-09 01:45:06 +00007259 if (!IsInc) {
John McCall09431682010-11-18 19:01:18 +00007260 S.Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange();
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00007261 return QualType();
7262 }
7263 // Increment of bool sets it to true, but is deprecated.
John McCall09431682010-11-18 19:01:18 +00007264 S.Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange();
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00007265 } else if (ResType->isRealType()) {
Chris Lattner3528d352008-11-21 07:05:48 +00007266 // OK!
Steve Naroff58f9f2c2009-07-14 18:25:06 +00007267 } else if (ResType->isAnyPointerType()) {
Chris Lattner3528d352008-11-21 07:05:48 +00007268 // C99 6.5.2.4p2, 6.5.6p2
Chandler Carruth13b21be2011-06-27 08:02:19 +00007269 if (!checkArithmeticOpPointerOperand(S, OpLoc, Op))
Douglas Gregor4ec339f2009-01-19 19:26:10 +00007270 return QualType();
Chandler Carruth13b21be2011-06-27 08:02:19 +00007271
Fariborz Jahanian9f8a04f2009-07-16 17:59:14 +00007272 // Diagnose bad cases where we step over interface counts.
Richard Trieudb44a6b2011-09-01 22:53:23 +00007273 else if (!checkArithmethicPointerOnNonFragileABI(S, OpLoc, Op))
Fariborz Jahanian9f8a04f2009-07-16 17:59:14 +00007274 return QualType();
Eli Friedman5b088a12010-01-03 00:20:48 +00007275 } else if (ResType->isAnyComplexType()) {
Chris Lattner3528d352008-11-21 07:05:48 +00007276 // C99 does not support ++/-- on complex types, we allow as an extension.
John McCall09431682010-11-18 19:01:18 +00007277 S.Diag(OpLoc, diag::ext_integer_increment_complex)
Chris Lattnerd1625842008-11-24 06:25:27 +00007278 << ResType << Op->getSourceRange();
John McCall2cd11fe2010-10-12 02:09:17 +00007279 } else if (ResType->isPlaceholderType()) {
John McCallfb8721c2011-04-10 19:13:55 +00007280 ExprResult PR = S.CheckPlaceholderExpr(Op);
John McCall2cd11fe2010-10-12 02:09:17 +00007281 if (PR.isInvalid()) return QualType();
John McCall09431682010-11-18 19:01:18 +00007282 return CheckIncrementDecrementOperand(S, PR.take(), VK, OpLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00007283 IsInc, IsPrefix);
Anton Yartsev683564a2011-02-07 02:17:30 +00007284 } else if (S.getLangOptions().AltiVec && ResType->isVectorType()) {
7285 // OK! ( C/C++ Language Extensions for CBEA(Version 2.6) 10.3 )
Chris Lattner3528d352008-11-21 07:05:48 +00007286 } else {
John McCall09431682010-11-18 19:01:18 +00007287 S.Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement)
Richard Trieuccd891a2011-09-09 01:45:06 +00007288 << ResType << int(IsInc) << Op->getSourceRange();
Chris Lattner3528d352008-11-21 07:05:48 +00007289 return QualType();
Reid Spencer5f016e22007-07-11 17:01:13 +00007290 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007291 // At this point, we know we have a real, complex or pointer type.
Steve Naroffdd10e022007-08-23 21:37:33 +00007292 // Now make sure the operand is a modifiable lvalue.
John McCall09431682010-11-18 19:01:18 +00007293 if (CheckForModifiableLvalue(Op, OpLoc, S))
Reid Spencer5f016e22007-07-11 17:01:13 +00007294 return QualType();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00007295 // In C++, a prefix increment is the same type as the operand. Otherwise
7296 // (in C or with postfix), the increment is the unqualified type of the
7297 // operand.
Richard Trieuccd891a2011-09-09 01:45:06 +00007298 if (IsPrefix && S.getLangOptions().CPlusPlus) {
John McCall09431682010-11-18 19:01:18 +00007299 VK = VK_LValue;
7300 return ResType;
7301 } else {
7302 VK = VK_RValue;
7303 return ResType.getUnqualifiedType();
7304 }
Reid Spencer5f016e22007-07-11 17:01:13 +00007305}
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00007306
7307
Anders Carlsson369dee42008-02-01 07:15:58 +00007308/// getPrimaryDecl - Helper function for CheckAddressOfOperand().
Reid Spencer5f016e22007-07-11 17:01:13 +00007309/// This routine allows us to typecheck complex/recursive expressions
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007310/// where the declaration is needed for type checking. We only need to
7311/// handle cases when the expression references a function designator
7312/// or is an lvalue. Here are some examples:
7313/// - &(x) => x
7314/// - &*****f => f for f a function designator.
7315/// - &s.xx => s
7316/// - &s.zz[1].yy -> s, if zz is an array
7317/// - *(x + 1) -> x, if x is an array
7318/// - &"123"[2] -> 0
7319/// - & __real__ x -> x
John McCall5808ce42011-02-03 08:15:49 +00007320static ValueDecl *getPrimaryDecl(Expr *E) {
Chris Lattnerf0467b32008-04-02 04:24:33 +00007321 switch (E->getStmtClass()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00007322 case Stmt::DeclRefExprClass:
Chris Lattnerf0467b32008-04-02 04:24:33 +00007323 return cast<DeclRefExpr>(E)->getDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00007324 case Stmt::MemberExprClass:
Eli Friedman23d58ce2009-04-20 08:23:18 +00007325 // If this is an arrow operator, the address is an offset from
7326 // the base's value, so the object the base refers to is
7327 // irrelevant.
Chris Lattnerf0467b32008-04-02 04:24:33 +00007328 if (cast<MemberExpr>(E)->isArrow())
Chris Lattnerf82228f2007-11-16 17:46:48 +00007329 return 0;
Eli Friedman23d58ce2009-04-20 08:23:18 +00007330 // Otherwise, the expression refers to a part of the base
Chris Lattnerf0467b32008-04-02 04:24:33 +00007331 return getPrimaryDecl(cast<MemberExpr>(E)->getBase());
Anders Carlsson369dee42008-02-01 07:15:58 +00007332 case Stmt::ArraySubscriptExprClass: {
Mike Stump390b4cc2009-05-16 07:39:55 +00007333 // FIXME: This code shouldn't be necessary! We should catch the implicit
7334 // promotion of register arrays earlier.
Eli Friedman23d58ce2009-04-20 08:23:18 +00007335 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase();
7336 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) {
7337 if (ICE->getSubExpr()->getType()->isArrayType())
7338 return getPrimaryDecl(ICE->getSubExpr());
7339 }
7340 return 0;
Anders Carlsson369dee42008-02-01 07:15:58 +00007341 }
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007342 case Stmt::UnaryOperatorClass: {
7343 UnaryOperator *UO = cast<UnaryOperator>(E);
Mike Stumpeed9cac2009-02-19 03:04:26 +00007344
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007345 switch(UO->getOpcode()) {
John McCall2de56d12010-08-25 11:45:40 +00007346 case UO_Real:
7347 case UO_Imag:
7348 case UO_Extension:
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007349 return getPrimaryDecl(UO->getSubExpr());
7350 default:
7351 return 0;
7352 }
7353 }
Reid Spencer5f016e22007-07-11 17:01:13 +00007354 case Stmt::ParenExprClass:
Chris Lattnerf0467b32008-04-02 04:24:33 +00007355 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr());
Chris Lattnerf82228f2007-11-16 17:46:48 +00007356 case Stmt::ImplicitCastExprClass:
Eli Friedman23d58ce2009-04-20 08:23:18 +00007357 // If the result of an implicit cast is an l-value, we care about
7358 // the sub-expression; otherwise, the result here doesn't matter.
Chris Lattnerf0467b32008-04-02 04:24:33 +00007359 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr());
Reid Spencer5f016e22007-07-11 17:01:13 +00007360 default:
7361 return 0;
7362 }
7363}
7364
Richard Trieu5520f232011-09-07 21:46:33 +00007365namespace {
7366 enum {
7367 AO_Bit_Field = 0,
7368 AO_Vector_Element = 1,
7369 AO_Property_Expansion = 2,
7370 AO_Register_Variable = 3,
7371 AO_No_Error = 4
7372 };
7373}
Richard Trieu09a26ad2011-09-02 00:47:55 +00007374/// \brief Diagnose invalid operand for address of operations.
7375///
7376/// \param Type The type of operand which cannot have its address taken.
Richard Trieu09a26ad2011-09-02 00:47:55 +00007377static void diagnoseAddressOfInvalidType(Sema &S, SourceLocation Loc,
7378 Expr *E, unsigned Type) {
7379 S.Diag(Loc, diag::err_typecheck_address_of) << Type << E->getSourceRange();
7380}
7381
Reid Spencer5f016e22007-07-11 17:01:13 +00007382/// CheckAddressOfOperand - The operand of & must be either a function
Mike Stumpeed9cac2009-02-19 03:04:26 +00007383/// designator or an lvalue designating an object. If it is an lvalue, the
Reid Spencer5f016e22007-07-11 17:01:13 +00007384/// object cannot be declared with storage class register or be a bit field.
Mike Stumpeed9cac2009-02-19 03:04:26 +00007385/// Note: The usual conversions are *not* applied to the operand of the &
Reid Spencer5f016e22007-07-11 17:01:13 +00007386/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue.
Mike Stumpeed9cac2009-02-19 03:04:26 +00007387/// In C++, the operand might be an overloaded function name, in which case
Douglas Gregor904eed32008-11-10 20:40:00 +00007388/// we allow the '&' but retain the overloaded-function type.
John McCall3c3b7f92011-10-25 17:37:35 +00007389static QualType CheckAddressOfOperand(Sema &S, ExprResult &OrigOp,
John McCall09431682010-11-18 19:01:18 +00007390 SourceLocation OpLoc) {
John McCall3c3b7f92011-10-25 17:37:35 +00007391 if (const BuiltinType *PTy = OrigOp.get()->getType()->getAsPlaceholderType()){
7392 if (PTy->getKind() == BuiltinType::Overload) {
7393 if (!isa<OverloadExpr>(OrigOp.get()->IgnoreParens())) {
7394 S.Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof)
7395 << OrigOp.get()->getSourceRange();
7396 return QualType();
7397 }
7398
7399 return S.Context.OverloadTy;
7400 }
7401
7402 if (PTy->getKind() == BuiltinType::UnknownAny)
7403 return S.Context.UnknownAnyTy;
7404
7405 if (PTy->getKind() == BuiltinType::BoundMember) {
7406 S.Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
7407 << OrigOp.get()->getSourceRange();
Douglas Gregor44efed02011-10-09 19:10:41 +00007408 return QualType();
7409 }
John McCall3c3b7f92011-10-25 17:37:35 +00007410
7411 OrigOp = S.CheckPlaceholderExpr(OrigOp.take());
7412 if (OrigOp.isInvalid()) return QualType();
John McCall864c0412011-04-26 20:42:42 +00007413 }
John McCall9c72c602010-08-27 09:08:28 +00007414
John McCall3c3b7f92011-10-25 17:37:35 +00007415 if (OrigOp.get()->isTypeDependent())
7416 return S.Context.DependentTy;
7417
7418 assert(!OrigOp.get()->getType()->isPlaceholderType());
John McCall2cd11fe2010-10-12 02:09:17 +00007419
John McCall9c72c602010-08-27 09:08:28 +00007420 // Make sure to ignore parentheses in subsequent checks
John McCall3c3b7f92011-10-25 17:37:35 +00007421 Expr *op = OrigOp.get()->IgnoreParens();
Douglas Gregor9103bb22008-12-17 22:52:20 +00007422
John McCall09431682010-11-18 19:01:18 +00007423 if (S.getLangOptions().C99) {
Steve Naroff08f19672008-01-13 17:10:08 +00007424 // Implement C99-only parts of addressof rules.
7425 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) {
John McCall2de56d12010-08-25 11:45:40 +00007426 if (uOp->getOpcode() == UO_Deref)
Steve Naroff08f19672008-01-13 17:10:08 +00007427 // Per C99 6.5.3.2, the address of a deref always returns a valid result
7428 // (assuming the deref expression is valid).
7429 return uOp->getSubExpr()->getType();
7430 }
7431 // Technically, there should be a check for array subscript
7432 // expressions here, but the result of one is always an lvalue anyway.
7433 }
John McCall5808ce42011-02-03 08:15:49 +00007434 ValueDecl *dcl = getPrimaryDecl(op);
John McCall7eb0a9e2010-11-24 05:12:34 +00007435 Expr::LValueClassification lval = op->ClassifyLValue(S.Context);
Richard Trieu5520f232011-09-07 21:46:33 +00007436 unsigned AddressOfError = AO_No_Error;
Nuno Lopes6b6609f2008-12-16 22:59:47 +00007437
Fariborz Jahanian077f4902011-03-26 19:48:30 +00007438 if (lval == Expr::LV_ClassTemporary) {
John McCall09431682010-11-18 19:01:18 +00007439 bool sfinae = S.isSFINAEContext();
7440 S.Diag(OpLoc, sfinae ? diag::err_typecheck_addrof_class_temporary
7441 : diag::ext_typecheck_addrof_class_temporary)
Douglas Gregore873fb72010-02-16 21:39:57 +00007442 << op->getType() << op->getSourceRange();
John McCall09431682010-11-18 19:01:18 +00007443 if (sfinae)
Douglas Gregore873fb72010-02-16 21:39:57 +00007444 return QualType();
John McCall9c72c602010-08-27 09:08:28 +00007445 } else if (isa<ObjCSelectorExpr>(op)) {
John McCall09431682010-11-18 19:01:18 +00007446 return S.Context.getPointerType(op->getType());
John McCall9c72c602010-08-27 09:08:28 +00007447 } else if (lval == Expr::LV_MemberFunction) {
7448 // If it's an instance method, make a member pointer.
7449 // The expression must have exactly the form &A::foo.
7450
7451 // If the underlying expression isn't a decl ref, give up.
7452 if (!isa<DeclRefExpr>(op)) {
John McCall09431682010-11-18 19:01:18 +00007453 S.Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
John McCall3c3b7f92011-10-25 17:37:35 +00007454 << OrigOp.get()->getSourceRange();
John McCall9c72c602010-08-27 09:08:28 +00007455 return QualType();
7456 }
7457 DeclRefExpr *DRE = cast<DeclRefExpr>(op);
7458 CXXMethodDecl *MD = cast<CXXMethodDecl>(DRE->getDecl());
7459
7460 // The id-expression was parenthesized.
John McCall3c3b7f92011-10-25 17:37:35 +00007461 if (OrigOp.get() != DRE) {
John McCall09431682010-11-18 19:01:18 +00007462 S.Diag(OpLoc, diag::err_parens_pointer_member_function)
John McCall3c3b7f92011-10-25 17:37:35 +00007463 << OrigOp.get()->getSourceRange();
John McCall9c72c602010-08-27 09:08:28 +00007464
7465 // The method was named without a qualifier.
7466 } else if (!DRE->getQualifier()) {
John McCall09431682010-11-18 19:01:18 +00007467 S.Diag(OpLoc, diag::err_unqualified_pointer_member_function)
John McCall9c72c602010-08-27 09:08:28 +00007468 << op->getSourceRange();
7469 }
7470
John McCall09431682010-11-18 19:01:18 +00007471 return S.Context.getMemberPointerType(op->getType(),
7472 S.Context.getTypeDeclType(MD->getParent()).getTypePtr());
John McCall9c72c602010-08-27 09:08:28 +00007473 } else if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) {
Eli Friedman441cf102009-05-16 23:27:50 +00007474 // C99 6.5.3.2p1
Eli Friedman23d58ce2009-04-20 08:23:18 +00007475 // The operand must be either an l-value or a function designator
Eli Friedman441cf102009-05-16 23:27:50 +00007476 if (!op->getType()->isFunctionType()) {
John McCall3c3b7f92011-10-25 17:37:35 +00007477 // Use a special diagnostic for loads from property references.
John McCall4b9c2d22011-11-06 09:01:30 +00007478 if (isa<PseudoObjectExpr>(op)) {
John McCall3c3b7f92011-10-25 17:37:35 +00007479 AddressOfError = AO_Property_Expansion;
7480 } else {
7481 // FIXME: emit more specific diag...
7482 S.Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof)
7483 << op->getSourceRange();
7484 return QualType();
7485 }
Reid Spencer5f016e22007-07-11 17:01:13 +00007486 }
John McCall7eb0a9e2010-11-24 05:12:34 +00007487 } else if (op->getObjectKind() == OK_BitField) { // C99 6.5.3.2p1
Eli Friedman23d58ce2009-04-20 08:23:18 +00007488 // The operand cannot be a bit-field
Richard Trieu5520f232011-09-07 21:46:33 +00007489 AddressOfError = AO_Bit_Field;
John McCall7eb0a9e2010-11-24 05:12:34 +00007490 } else if (op->getObjectKind() == OK_VectorComponent) {
Eli Friedman23d58ce2009-04-20 08:23:18 +00007491 // The operand cannot be an element of a vector
Richard Trieu5520f232011-09-07 21:46:33 +00007492 AddressOfError = AO_Vector_Element;
Steve Naroffbcb2b612008-02-29 23:30:25 +00007493 } else if (dcl) { // C99 6.5.3.2p1
Mike Stumpeed9cac2009-02-19 03:04:26 +00007494 // We have an lvalue with a decl. Make sure the decl is not declared
Reid Spencer5f016e22007-07-11 17:01:13 +00007495 // with the register storage-class specifier.
7496 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) {
Fariborz Jahanian4020f872010-08-24 22:21:48 +00007497 // in C++ it is not error to take address of a register
7498 // variable (c++03 7.1.1P3)
John McCalld931b082010-08-26 03:08:43 +00007499 if (vd->getStorageClass() == SC_Register &&
John McCall09431682010-11-18 19:01:18 +00007500 !S.getLangOptions().CPlusPlus) {
Richard Trieu5520f232011-09-07 21:46:33 +00007501 AddressOfError = AO_Register_Variable;
Reid Spencer5f016e22007-07-11 17:01:13 +00007502 }
John McCallba135432009-11-21 08:51:07 +00007503 } else if (isa<FunctionTemplateDecl>(dcl)) {
John McCall09431682010-11-18 19:01:18 +00007504 return S.Context.OverloadTy;
John McCall5808ce42011-02-03 08:15:49 +00007505 } else if (isa<FieldDecl>(dcl) || isa<IndirectFieldDecl>(dcl)) {
Douglas Gregor29882052008-12-10 21:26:49 +00007506 // Okay: we can take the address of a field.
Sebastian Redlebc07d52009-02-03 20:19:35 +00007507 // Could be a pointer to member, though, if there is an explicit
7508 // scope qualifier for the class.
Douglas Gregora2813ce2009-10-23 18:54:35 +00007509 if (isa<DeclRefExpr>(op) && cast<DeclRefExpr>(op)->getQualifier()) {
Sebastian Redlebc07d52009-02-03 20:19:35 +00007510 DeclContext *Ctx = dcl->getDeclContext();
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00007511 if (Ctx && Ctx->isRecord()) {
John McCall5808ce42011-02-03 08:15:49 +00007512 if (dcl->getType()->isReferenceType()) {
John McCall09431682010-11-18 19:01:18 +00007513 S.Diag(OpLoc,
7514 diag::err_cannot_form_pointer_to_member_of_reference_type)
John McCall5808ce42011-02-03 08:15:49 +00007515 << dcl->getDeclName() << dcl->getType();
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00007516 return QualType();
7517 }
Mike Stump1eb44332009-09-09 15:08:12 +00007518
Argyrios Kyrtzidis0413db42011-01-31 07:04:29 +00007519 while (cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion())
7520 Ctx = Ctx->getParent();
John McCall09431682010-11-18 19:01:18 +00007521 return S.Context.getMemberPointerType(op->getType(),
7522 S.Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr());
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00007523 }
Sebastian Redlebc07d52009-02-03 20:19:35 +00007524 }
Eli Friedman7b2f51c2011-08-26 20:28:17 +00007525 } else if (!isa<FunctionDecl>(dcl) && !isa<NonTypeTemplateParmDecl>(dcl))
David Blaikieb219cfc2011-09-23 05:06:16 +00007526 llvm_unreachable("Unknown/unexpected decl type");
Reid Spencer5f016e22007-07-11 17:01:13 +00007527 }
Sebastian Redl33b399a2009-02-04 21:23:32 +00007528
Richard Trieu5520f232011-09-07 21:46:33 +00007529 if (AddressOfError != AO_No_Error) {
7530 diagnoseAddressOfInvalidType(S, OpLoc, op, AddressOfError);
7531 return QualType();
7532 }
7533
Eli Friedman441cf102009-05-16 23:27:50 +00007534 if (lval == Expr::LV_IncompleteVoidType) {
7535 // Taking the address of a void variable is technically illegal, but we
7536 // allow it in cases which are otherwise valid.
7537 // Example: "extern void x; void* y = &x;".
John McCall09431682010-11-18 19:01:18 +00007538 S.Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange();
Eli Friedman441cf102009-05-16 23:27:50 +00007539 }
7540
Reid Spencer5f016e22007-07-11 17:01:13 +00007541 // If the operand has type "type", the result has type "pointer to type".
Douglas Gregor8f70ddb2010-07-29 16:05:45 +00007542 if (op->getType()->isObjCObjectType())
John McCall09431682010-11-18 19:01:18 +00007543 return S.Context.getObjCObjectPointerType(op->getType());
7544 return S.Context.getPointerType(op->getType());
Reid Spencer5f016e22007-07-11 17:01:13 +00007545}
7546
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007547/// CheckIndirectionOperand - Type check unary indirection (prefix '*').
John McCall09431682010-11-18 19:01:18 +00007548static QualType CheckIndirectionOperand(Sema &S, Expr *Op, ExprValueKind &VK,
7549 SourceLocation OpLoc) {
Sebastian Redl28507842009-02-26 14:39:58 +00007550 if (Op->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00007551 return S.Context.DependentTy;
Sebastian Redl28507842009-02-26 14:39:58 +00007552
John Wiegley429bb272011-04-08 18:41:53 +00007553 ExprResult ConvResult = S.UsualUnaryConversions(Op);
7554 if (ConvResult.isInvalid())
7555 return QualType();
7556 Op = ConvResult.take();
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007557 QualType OpTy = Op->getType();
7558 QualType Result;
Argyrios Kyrtzidisf4bbbf02011-05-02 18:21:19 +00007559
7560 if (isa<CXXReinterpretCastExpr>(Op)) {
7561 QualType OpOrigType = Op->IgnoreParenCasts()->getType();
7562 S.CheckCompatibleReinterpretCast(OpOrigType, OpTy, /*IsDereference*/true,
7563 Op->getSourceRange());
7564 }
7565
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007566 // Note that per both C89 and C99, indirection is always legal, even if OpTy
7567 // is an incomplete type or void. It would be possible to warn about
7568 // dereferencing a void pointer, but it's completely well-defined, and such a
7569 // warning is unlikely to catch any mistakes.
7570 if (const PointerType *PT = OpTy->getAs<PointerType>())
7571 Result = PT->getPointeeType();
7572 else if (const ObjCObjectPointerType *OPT =
7573 OpTy->getAs<ObjCObjectPointerType>())
7574 Result = OPT->getPointeeType();
John McCall2cd11fe2010-10-12 02:09:17 +00007575 else {
John McCallfb8721c2011-04-10 19:13:55 +00007576 ExprResult PR = S.CheckPlaceholderExpr(Op);
John McCall2cd11fe2010-10-12 02:09:17 +00007577 if (PR.isInvalid()) return QualType();
John McCall09431682010-11-18 19:01:18 +00007578 if (PR.take() != Op)
7579 return CheckIndirectionOperand(S, PR.take(), VK, OpLoc);
John McCall2cd11fe2010-10-12 02:09:17 +00007580 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007581
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007582 if (Result.isNull()) {
John McCall09431682010-11-18 19:01:18 +00007583 S.Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer)
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007584 << OpTy << Op->getSourceRange();
7585 return QualType();
7586 }
John McCall09431682010-11-18 19:01:18 +00007587
7588 // Dereferences are usually l-values...
7589 VK = VK_LValue;
7590
7591 // ...except that certain expressions are never l-values in C.
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00007592 if (!S.getLangOptions().CPlusPlus && Result.isCForbiddenLValueType())
John McCall09431682010-11-18 19:01:18 +00007593 VK = VK_RValue;
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007594
7595 return Result;
Reid Spencer5f016e22007-07-11 17:01:13 +00007596}
7597
John McCall2de56d12010-08-25 11:45:40 +00007598static inline BinaryOperatorKind ConvertTokenKindToBinaryOpcode(
Reid Spencer5f016e22007-07-11 17:01:13 +00007599 tok::TokenKind Kind) {
John McCall2de56d12010-08-25 11:45:40 +00007600 BinaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00007601 switch (Kind) {
David Blaikieb219cfc2011-09-23 05:06:16 +00007602 default: llvm_unreachable("Unknown binop!");
John McCall2de56d12010-08-25 11:45:40 +00007603 case tok::periodstar: Opc = BO_PtrMemD; break;
7604 case tok::arrowstar: Opc = BO_PtrMemI; break;
7605 case tok::star: Opc = BO_Mul; break;
7606 case tok::slash: Opc = BO_Div; break;
7607 case tok::percent: Opc = BO_Rem; break;
7608 case tok::plus: Opc = BO_Add; break;
7609 case tok::minus: Opc = BO_Sub; break;
7610 case tok::lessless: Opc = BO_Shl; break;
7611 case tok::greatergreater: Opc = BO_Shr; break;
7612 case tok::lessequal: Opc = BO_LE; break;
7613 case tok::less: Opc = BO_LT; break;
7614 case tok::greaterequal: Opc = BO_GE; break;
7615 case tok::greater: Opc = BO_GT; break;
7616 case tok::exclaimequal: Opc = BO_NE; break;
7617 case tok::equalequal: Opc = BO_EQ; break;
7618 case tok::amp: Opc = BO_And; break;
7619 case tok::caret: Opc = BO_Xor; break;
7620 case tok::pipe: Opc = BO_Or; break;
7621 case tok::ampamp: Opc = BO_LAnd; break;
7622 case tok::pipepipe: Opc = BO_LOr; break;
7623 case tok::equal: Opc = BO_Assign; break;
7624 case tok::starequal: Opc = BO_MulAssign; break;
7625 case tok::slashequal: Opc = BO_DivAssign; break;
7626 case tok::percentequal: Opc = BO_RemAssign; break;
7627 case tok::plusequal: Opc = BO_AddAssign; break;
7628 case tok::minusequal: Opc = BO_SubAssign; break;
7629 case tok::lesslessequal: Opc = BO_ShlAssign; break;
7630 case tok::greatergreaterequal: Opc = BO_ShrAssign; break;
7631 case tok::ampequal: Opc = BO_AndAssign; break;
7632 case tok::caretequal: Opc = BO_XorAssign; break;
7633 case tok::pipeequal: Opc = BO_OrAssign; break;
7634 case tok::comma: Opc = BO_Comma; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00007635 }
7636 return Opc;
7637}
7638
John McCall2de56d12010-08-25 11:45:40 +00007639static inline UnaryOperatorKind ConvertTokenKindToUnaryOpcode(
Reid Spencer5f016e22007-07-11 17:01:13 +00007640 tok::TokenKind Kind) {
John McCall2de56d12010-08-25 11:45:40 +00007641 UnaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00007642 switch (Kind) {
David Blaikieb219cfc2011-09-23 05:06:16 +00007643 default: llvm_unreachable("Unknown unary op!");
John McCall2de56d12010-08-25 11:45:40 +00007644 case tok::plusplus: Opc = UO_PreInc; break;
7645 case tok::minusminus: Opc = UO_PreDec; break;
7646 case tok::amp: Opc = UO_AddrOf; break;
7647 case tok::star: Opc = UO_Deref; break;
7648 case tok::plus: Opc = UO_Plus; break;
7649 case tok::minus: Opc = UO_Minus; break;
7650 case tok::tilde: Opc = UO_Not; break;
7651 case tok::exclaim: Opc = UO_LNot; break;
7652 case tok::kw___real: Opc = UO_Real; break;
7653 case tok::kw___imag: Opc = UO_Imag; break;
7654 case tok::kw___extension__: Opc = UO_Extension; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00007655 }
7656 return Opc;
7657}
7658
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007659/// DiagnoseSelfAssignment - Emits a warning if a value is assigned to itself.
7660/// This warning is only emitted for builtin assignment operations. It is also
7661/// suppressed in the event of macro expansions.
Richard Trieu268942b2011-09-07 01:33:52 +00007662static void DiagnoseSelfAssignment(Sema &S, Expr *LHSExpr, Expr *RHSExpr,
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007663 SourceLocation OpLoc) {
7664 if (!S.ActiveTemplateInstantiations.empty())
7665 return;
7666 if (OpLoc.isInvalid() || OpLoc.isMacroID())
7667 return;
Richard Trieu268942b2011-09-07 01:33:52 +00007668 LHSExpr = LHSExpr->IgnoreParenImpCasts();
7669 RHSExpr = RHSExpr->IgnoreParenImpCasts();
7670 const DeclRefExpr *LHSDeclRef = dyn_cast<DeclRefExpr>(LHSExpr);
7671 const DeclRefExpr *RHSDeclRef = dyn_cast<DeclRefExpr>(RHSExpr);
7672 if (!LHSDeclRef || !RHSDeclRef ||
7673 LHSDeclRef->getLocation().isMacroID() ||
7674 RHSDeclRef->getLocation().isMacroID())
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007675 return;
Richard Trieu268942b2011-09-07 01:33:52 +00007676 const ValueDecl *LHSDecl =
7677 cast<ValueDecl>(LHSDeclRef->getDecl()->getCanonicalDecl());
7678 const ValueDecl *RHSDecl =
7679 cast<ValueDecl>(RHSDeclRef->getDecl()->getCanonicalDecl());
7680 if (LHSDecl != RHSDecl)
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007681 return;
Richard Trieu268942b2011-09-07 01:33:52 +00007682 if (LHSDecl->getType().isVolatileQualified())
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007683 return;
Richard Trieu268942b2011-09-07 01:33:52 +00007684 if (const ReferenceType *RefTy = LHSDecl->getType()->getAs<ReferenceType>())
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007685 if (RefTy->getPointeeType().isVolatileQualified())
7686 return;
7687
7688 S.Diag(OpLoc, diag::warn_self_assignment)
Richard Trieu268942b2011-09-07 01:33:52 +00007689 << LHSDeclRef->getType()
7690 << LHSExpr->getSourceRange() << RHSExpr->getSourceRange();
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007691}
7692
Douglas Gregoreaebc752008-11-06 23:29:22 +00007693/// CreateBuiltinBinOp - Creates a new built-in binary operation with
7694/// operator @p Opc at location @c TokLoc. This routine only supports
7695/// built-in operations; ActOnBinOp handles overloaded operators.
John McCall60d7b3a2010-08-24 06:29:42 +00007696ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc,
Argyrios Kyrtzidisb1fa3dc2011-01-05 20:09:36 +00007697 BinaryOperatorKind Opc,
Richard Trieu78ea78b2011-09-07 01:49:20 +00007698 Expr *LHSExpr, Expr *RHSExpr) {
7699 ExprResult LHS = Owned(LHSExpr), RHS = Owned(RHSExpr);
Eli Friedmanab3a8522009-03-28 01:22:36 +00007700 QualType ResultTy; // Result type of the binary operator.
Eli Friedmanab3a8522009-03-28 01:22:36 +00007701 // The following two variables are used for compound assignment operators
7702 QualType CompLHSTy; // Type of LHS after promotions for computation
7703 QualType CompResultTy; // Type of computation result
John McCallf89e55a2010-11-18 06:31:45 +00007704 ExprValueKind VK = VK_RValue;
7705 ExprObjectKind OK = OK_Ordinary;
Douglas Gregoreaebc752008-11-06 23:29:22 +00007706
7707 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00007708 case BO_Assign:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007709 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, QualType());
John McCallf6a16482010-12-04 03:47:34 +00007710 if (getLangOptions().CPlusPlus &&
Richard Trieu78ea78b2011-09-07 01:49:20 +00007711 LHS.get()->getObjectKind() != OK_ObjCProperty) {
7712 VK = LHS.get()->getValueKind();
7713 OK = LHS.get()->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00007714 }
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007715 if (!ResultTy.isNull())
Richard Trieu78ea78b2011-09-07 01:49:20 +00007716 DiagnoseSelfAssignment(*this, LHS.get(), RHS.get(), OpLoc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007717 break;
John McCall2de56d12010-08-25 11:45:40 +00007718 case BO_PtrMemD:
7719 case BO_PtrMemI:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007720 ResultTy = CheckPointerToMemberOperands(LHS, RHS, VK, OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00007721 Opc == BO_PtrMemI);
Sebastian Redl22460502009-02-07 00:15:38 +00007722 break;
John McCall2de56d12010-08-25 11:45:40 +00007723 case BO_Mul:
7724 case BO_Div:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007725 ResultTy = CheckMultiplyDivideOperands(LHS, RHS, OpLoc, false,
John McCall2de56d12010-08-25 11:45:40 +00007726 Opc == BO_Div);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007727 break;
John McCall2de56d12010-08-25 11:45:40 +00007728 case BO_Rem:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007729 ResultTy = CheckRemainderOperands(LHS, RHS, OpLoc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007730 break;
John McCall2de56d12010-08-25 11:45:40 +00007731 case BO_Add:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007732 ResultTy = CheckAdditionOperands(LHS, RHS, OpLoc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007733 break;
John McCall2de56d12010-08-25 11:45:40 +00007734 case BO_Sub:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007735 ResultTy = CheckSubtractionOperands(LHS, RHS, OpLoc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007736 break;
John McCall2de56d12010-08-25 11:45:40 +00007737 case BO_Shl:
7738 case BO_Shr:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007739 ResultTy = CheckShiftOperands(LHS, RHS, OpLoc, Opc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007740 break;
John McCall2de56d12010-08-25 11:45:40 +00007741 case BO_LE:
7742 case BO_LT:
7743 case BO_GE:
7744 case BO_GT:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007745 ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc, true);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007746 break;
John McCall2de56d12010-08-25 11:45:40 +00007747 case BO_EQ:
7748 case BO_NE:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007749 ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc, false);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007750 break;
John McCall2de56d12010-08-25 11:45:40 +00007751 case BO_And:
7752 case BO_Xor:
7753 case BO_Or:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007754 ResultTy = CheckBitwiseOperands(LHS, RHS, OpLoc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007755 break;
John McCall2de56d12010-08-25 11:45:40 +00007756 case BO_LAnd:
7757 case BO_LOr:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007758 ResultTy = CheckLogicalOperands(LHS, RHS, OpLoc, Opc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007759 break;
John McCall2de56d12010-08-25 11:45:40 +00007760 case BO_MulAssign:
7761 case BO_DivAssign:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007762 CompResultTy = CheckMultiplyDivideOperands(LHS, RHS, OpLoc, true,
John McCallf89e55a2010-11-18 06:31:45 +00007763 Opc == BO_DivAssign);
Eli Friedmanab3a8522009-03-28 01:22:36 +00007764 CompLHSTy = CompResultTy;
Richard Trieu78ea78b2011-09-07 01:49:20 +00007765 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
7766 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007767 break;
John McCall2de56d12010-08-25 11:45:40 +00007768 case BO_RemAssign:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007769 CompResultTy = CheckRemainderOperands(LHS, RHS, OpLoc, true);
Eli Friedmanab3a8522009-03-28 01:22:36 +00007770 CompLHSTy = CompResultTy;
Richard Trieu78ea78b2011-09-07 01:49:20 +00007771 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
7772 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007773 break;
John McCall2de56d12010-08-25 11:45:40 +00007774 case BO_AddAssign:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007775 CompResultTy = CheckAdditionOperands(LHS, RHS, OpLoc, &CompLHSTy);
7776 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
7777 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007778 break;
John McCall2de56d12010-08-25 11:45:40 +00007779 case BO_SubAssign:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007780 CompResultTy = CheckSubtractionOperands(LHS, RHS, OpLoc, &CompLHSTy);
7781 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
7782 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007783 break;
John McCall2de56d12010-08-25 11:45:40 +00007784 case BO_ShlAssign:
7785 case BO_ShrAssign:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007786 CompResultTy = CheckShiftOperands(LHS, RHS, OpLoc, Opc, true);
Eli Friedmanab3a8522009-03-28 01:22:36 +00007787 CompLHSTy = CompResultTy;
Richard Trieu78ea78b2011-09-07 01:49:20 +00007788 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
7789 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007790 break;
John McCall2de56d12010-08-25 11:45:40 +00007791 case BO_AndAssign:
7792 case BO_XorAssign:
7793 case BO_OrAssign:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007794 CompResultTy = CheckBitwiseOperands(LHS, RHS, OpLoc, true);
Eli Friedmanab3a8522009-03-28 01:22:36 +00007795 CompLHSTy = CompResultTy;
Richard Trieu78ea78b2011-09-07 01:49:20 +00007796 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
7797 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007798 break;
John McCall2de56d12010-08-25 11:45:40 +00007799 case BO_Comma:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007800 ResultTy = CheckCommaOperands(*this, LHS, RHS, OpLoc);
7801 if (getLangOptions().CPlusPlus && !RHS.isInvalid()) {
7802 VK = RHS.get()->getValueKind();
7803 OK = RHS.get()->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00007804 }
Douglas Gregoreaebc752008-11-06 23:29:22 +00007805 break;
7806 }
Richard Trieu78ea78b2011-09-07 01:49:20 +00007807 if (ResultTy.isNull() || LHS.isInvalid() || RHS.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00007808 return ExprError();
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00007809
7810 // Check for array bounds violations for both sides of the BinaryOperator
Richard Trieu78ea78b2011-09-07 01:49:20 +00007811 CheckArrayAccess(LHS.get());
7812 CheckArrayAccess(RHS.get());
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00007813
Eli Friedmanab3a8522009-03-28 01:22:36 +00007814 if (CompResultTy.isNull())
Richard Trieu78ea78b2011-09-07 01:49:20 +00007815 return Owned(new (Context) BinaryOperator(LHS.take(), RHS.take(), Opc,
John Wiegley429bb272011-04-08 18:41:53 +00007816 ResultTy, VK, OK, OpLoc));
Richard Trieu78ea78b2011-09-07 01:49:20 +00007817 if (getLangOptions().CPlusPlus && LHS.get()->getObjectKind() !=
Richard Trieu67e29332011-08-02 04:35:43 +00007818 OK_ObjCProperty) {
John McCallf89e55a2010-11-18 06:31:45 +00007819 VK = VK_LValue;
Richard Trieu78ea78b2011-09-07 01:49:20 +00007820 OK = LHS.get()->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00007821 }
Richard Trieu78ea78b2011-09-07 01:49:20 +00007822 return Owned(new (Context) CompoundAssignOperator(LHS.take(), RHS.take(), Opc,
John Wiegley429bb272011-04-08 18:41:53 +00007823 ResultTy, VK, OK, CompLHSTy,
John McCallf89e55a2010-11-18 06:31:45 +00007824 CompResultTy, OpLoc));
Douglas Gregoreaebc752008-11-06 23:29:22 +00007825}
7826
Sebastian Redlaee3c932009-10-27 12:10:02 +00007827/// DiagnoseBitwisePrecedence - Emit a warning when bitwise and comparison
7828/// operators are mixed in a way that suggests that the programmer forgot that
7829/// comparison operators have higher precedence. The most typical example of
7830/// such code is "flags & 0x0020 != 0", which is equivalent to "flags & 1".
John McCall2de56d12010-08-25 11:45:40 +00007831static void DiagnoseBitwisePrecedence(Sema &Self, BinaryOperatorKind Opc,
Richard Trieu78ea78b2011-09-07 01:49:20 +00007832 SourceLocation OpLoc, Expr *LHSExpr,
7833 Expr *RHSExpr) {
Sebastian Redlaee3c932009-10-27 12:10:02 +00007834 typedef BinaryOperator BinOp;
Richard Trieu78ea78b2011-09-07 01:49:20 +00007835 BinOp::Opcode LHSopc = static_cast<BinOp::Opcode>(-1),
7836 RHSopc = static_cast<BinOp::Opcode>(-1);
7837 if (BinOp *BO = dyn_cast<BinOp>(LHSExpr))
7838 LHSopc = BO->getOpcode();
7839 if (BinOp *BO = dyn_cast<BinOp>(RHSExpr))
7840 RHSopc = BO->getOpcode();
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007841
7842 // Subs are not binary operators.
Richard Trieu78ea78b2011-09-07 01:49:20 +00007843 if (LHSopc == -1 && RHSopc == -1)
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007844 return;
7845
7846 // Bitwise operations are sometimes used as eager logical ops.
7847 // Don't diagnose this.
Richard Trieu78ea78b2011-09-07 01:49:20 +00007848 if ((BinOp::isComparisonOp(LHSopc) || BinOp::isBitwiseOp(LHSopc)) &&
7849 (BinOp::isComparisonOp(RHSopc) || BinOp::isBitwiseOp(RHSopc)))
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007850 return;
7851
Richard Trieu78ea78b2011-09-07 01:49:20 +00007852 bool isLeftComp = BinOp::isComparisonOp(LHSopc);
7853 bool isRightComp = BinOp::isComparisonOp(RHSopc);
Richard Trieu70979d42011-08-10 22:41:34 +00007854 if (!isLeftComp && !isRightComp) return;
7855
Richard Trieu78ea78b2011-09-07 01:49:20 +00007856 SourceRange DiagRange = isLeftComp ? SourceRange(LHSExpr->getLocStart(),
7857 OpLoc)
7858 : SourceRange(OpLoc, RHSExpr->getLocEnd());
7859 std::string OpStr = isLeftComp ? BinOp::getOpcodeStr(LHSopc)
7860 : BinOp::getOpcodeStr(RHSopc);
Richard Trieu70979d42011-08-10 22:41:34 +00007861 SourceRange ParensRange = isLeftComp ?
Richard Trieu78ea78b2011-09-07 01:49:20 +00007862 SourceRange(cast<BinOp>(LHSExpr)->getRHS()->getLocStart(),
7863 RHSExpr->getLocEnd())
7864 : SourceRange(LHSExpr->getLocStart(),
7865 cast<BinOp>(RHSExpr)->getLHS()->getLocStart());
Richard Trieu70979d42011-08-10 22:41:34 +00007866
7867 Self.Diag(OpLoc, diag::warn_precedence_bitwise_rel)
7868 << DiagRange << BinOp::getOpcodeStr(Opc) << OpStr;
7869 SuggestParentheses(Self, OpLoc,
7870 Self.PDiag(diag::note_precedence_bitwise_silence) << OpStr,
Richard Trieu78ea78b2011-09-07 01:49:20 +00007871 RHSExpr->getSourceRange());
Richard Trieu70979d42011-08-10 22:41:34 +00007872 SuggestParentheses(Self, OpLoc,
7873 Self.PDiag(diag::note_precedence_bitwise_first) << BinOp::getOpcodeStr(Opc),
7874 ParensRange);
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007875}
7876
Argyrios Kyrtzidis33f46e22011-06-20 18:41:26 +00007877/// \brief It accepts a '&' expr that is inside a '|' one.
7878/// Emit a diagnostic together with a fixit hint that wraps the '&' expression
7879/// in parentheses.
7880static void
7881EmitDiagnosticForBitwiseAndInBitwiseOr(Sema &Self, SourceLocation OpLoc,
7882 BinaryOperator *Bop) {
7883 assert(Bop->getOpcode() == BO_And);
7884 Self.Diag(Bop->getOperatorLoc(), diag::warn_bitwise_and_in_bitwise_or)
7885 << Bop->getSourceRange() << OpLoc;
7886 SuggestParentheses(Self, Bop->getOperatorLoc(),
7887 Self.PDiag(diag::note_bitwise_and_in_bitwise_or_silence),
7888 Bop->getSourceRange());
7889}
7890
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007891/// \brief It accepts a '&&' expr that is inside a '||' one.
7892/// Emit a diagnostic together with a fixit hint that wraps the '&&' expression
7893/// in parentheses.
7894static void
7895EmitDiagnosticForLogicalAndInLogicalOr(Sema &Self, SourceLocation OpLoc,
Argyrios Kyrtzidisa61aedc2011-04-22 19:16:27 +00007896 BinaryOperator *Bop) {
7897 assert(Bop->getOpcode() == BO_LAnd);
Chandler Carruthf0b60d62011-06-16 01:05:14 +00007898 Self.Diag(Bop->getOperatorLoc(), diag::warn_logical_and_in_logical_or)
7899 << Bop->getSourceRange() << OpLoc;
Argyrios Kyrtzidisa61aedc2011-04-22 19:16:27 +00007900 SuggestParentheses(Self, Bop->getOperatorLoc(),
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007901 Self.PDiag(diag::note_logical_and_in_logical_or_silence),
Chandler Carruthf0b60d62011-06-16 01:05:14 +00007902 Bop->getSourceRange());
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007903}
7904
7905/// \brief Returns true if the given expression can be evaluated as a constant
7906/// 'true'.
7907static bool EvaluatesAsTrue(Sema &S, Expr *E) {
7908 bool Res;
7909 return E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && Res;
7910}
7911
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007912/// \brief Returns true if the given expression can be evaluated as a constant
7913/// 'false'.
7914static bool EvaluatesAsFalse(Sema &S, Expr *E) {
7915 bool Res;
7916 return E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && !Res;
7917}
7918
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007919/// \brief Look for '&&' in the left hand of a '||' expr.
7920static void DiagnoseLogicalAndInLogicalOrLHS(Sema &S, SourceLocation OpLoc,
Richard Trieubefece12011-09-07 02:02:10 +00007921 Expr *LHSExpr, Expr *RHSExpr) {
7922 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(LHSExpr)) {
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007923 if (Bop->getOpcode() == BO_LAnd) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007924 // If it's "a && b || 0" don't warn since the precedence doesn't matter.
Richard Trieubefece12011-09-07 02:02:10 +00007925 if (EvaluatesAsFalse(S, RHSExpr))
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007926 return;
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007927 // If it's "1 && a || b" don't warn since the precedence doesn't matter.
7928 if (!EvaluatesAsTrue(S, Bop->getLHS()))
7929 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
7930 } else if (Bop->getOpcode() == BO_LOr) {
7931 if (BinaryOperator *RBop = dyn_cast<BinaryOperator>(Bop->getRHS())) {
7932 // If it's "a || b && 1 || c" we didn't warn earlier for
7933 // "a || b && 1", but warn now.
7934 if (RBop->getOpcode() == BO_LAnd && EvaluatesAsTrue(S, RBop->getRHS()))
7935 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, RBop);
7936 }
7937 }
7938 }
7939}
7940
7941/// \brief Look for '&&' in the right hand of a '||' expr.
7942static void DiagnoseLogicalAndInLogicalOrRHS(Sema &S, SourceLocation OpLoc,
Richard Trieubefece12011-09-07 02:02:10 +00007943 Expr *LHSExpr, Expr *RHSExpr) {
7944 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(RHSExpr)) {
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007945 if (Bop->getOpcode() == BO_LAnd) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007946 // If it's "0 || a && b" don't warn since the precedence doesn't matter.
Richard Trieubefece12011-09-07 02:02:10 +00007947 if (EvaluatesAsFalse(S, LHSExpr))
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007948 return;
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007949 // If it's "a || b && 1" don't warn since the precedence doesn't matter.
7950 if (!EvaluatesAsTrue(S, Bop->getRHS()))
7951 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007952 }
7953 }
7954}
7955
Argyrios Kyrtzidis33f46e22011-06-20 18:41:26 +00007956/// \brief Look for '&' in the left or right hand of a '|' expr.
7957static void DiagnoseBitwiseAndInBitwiseOr(Sema &S, SourceLocation OpLoc,
7958 Expr *OrArg) {
7959 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(OrArg)) {
7960 if (Bop->getOpcode() == BO_And)
7961 return EmitDiagnosticForBitwiseAndInBitwiseOr(S, OpLoc, Bop);
7962 }
7963}
7964
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007965/// DiagnoseBinOpPrecedence - Emit warnings for expressions with tricky
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007966/// precedence.
John McCall2de56d12010-08-25 11:45:40 +00007967static void DiagnoseBinOpPrecedence(Sema &Self, BinaryOperatorKind Opc,
Richard Trieubefece12011-09-07 02:02:10 +00007968 SourceLocation OpLoc, Expr *LHSExpr,
7969 Expr *RHSExpr){
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007970 // Diagnose "arg1 'bitwise' arg2 'eq' arg3".
Sebastian Redlaee3c932009-10-27 12:10:02 +00007971 if (BinaryOperator::isBitwiseOp(Opc))
Richard Trieubefece12011-09-07 02:02:10 +00007972 DiagnoseBitwisePrecedence(Self, Opc, OpLoc, LHSExpr, RHSExpr);
Argyrios Kyrtzidis33f46e22011-06-20 18:41:26 +00007973
7974 // Diagnose "arg1 & arg2 | arg3"
7975 if (Opc == BO_Or && !OpLoc.isMacroID()/* Don't warn in macros. */) {
Richard Trieubefece12011-09-07 02:02:10 +00007976 DiagnoseBitwiseAndInBitwiseOr(Self, OpLoc, LHSExpr);
7977 DiagnoseBitwiseAndInBitwiseOr(Self, OpLoc, RHSExpr);
Argyrios Kyrtzidis33f46e22011-06-20 18:41:26 +00007978 }
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007979
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007980 // Warn about arg1 || arg2 && arg3, as GCC 4.3+ does.
7981 // We don't warn for 'assert(a || b && "bad")' since this is safe.
Argyrios Kyrtzidisd92ccaa2010-11-17 18:54:22 +00007982 if (Opc == BO_LOr && !OpLoc.isMacroID()/* Don't warn in macros. */) {
Richard Trieubefece12011-09-07 02:02:10 +00007983 DiagnoseLogicalAndInLogicalOrLHS(Self, OpLoc, LHSExpr, RHSExpr);
7984 DiagnoseLogicalAndInLogicalOrRHS(Self, OpLoc, LHSExpr, RHSExpr);
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007985 }
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007986}
7987
Reid Spencer5f016e22007-07-11 17:01:13 +00007988// Binary Operators. 'Tok' is the token for the operator.
John McCall60d7b3a2010-08-24 06:29:42 +00007989ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc,
John McCall2de56d12010-08-25 11:45:40 +00007990 tok::TokenKind Kind,
Richard Trieubefece12011-09-07 02:02:10 +00007991 Expr *LHSExpr, Expr *RHSExpr) {
John McCall2de56d12010-08-25 11:45:40 +00007992 BinaryOperatorKind Opc = ConvertTokenKindToBinaryOpcode(Kind);
Richard Trieubefece12011-09-07 02:02:10 +00007993 assert((LHSExpr != 0) && "ActOnBinOp(): missing left expression");
7994 assert((RHSExpr != 0) && "ActOnBinOp(): missing right expression");
Reid Spencer5f016e22007-07-11 17:01:13 +00007995
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007996 // Emit warnings for tricky precedence issues, e.g. "bitfield & 0x4 == 0"
Richard Trieubefece12011-09-07 02:02:10 +00007997 DiagnoseBinOpPrecedence(*this, Opc, TokLoc, LHSExpr, RHSExpr);
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007998
Richard Trieubefece12011-09-07 02:02:10 +00007999 return BuildBinOp(S, TokLoc, Opc, LHSExpr, RHSExpr);
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00008000}
8001
John McCall3c3b7f92011-10-25 17:37:35 +00008002/// Build an overloaded binary operator expression in the given scope.
8003static ExprResult BuildOverloadedBinOp(Sema &S, Scope *Sc, SourceLocation OpLoc,
8004 BinaryOperatorKind Opc,
8005 Expr *LHS, Expr *RHS) {
8006 // Find all of the overloaded operators visible from this
8007 // point. We perform both an operator-name lookup from the local
8008 // scope and an argument-dependent lookup based on the types of
8009 // the arguments.
8010 UnresolvedSet<16> Functions;
8011 OverloadedOperatorKind OverOp
8012 = BinaryOperator::getOverloadedOperator(Opc);
8013 if (Sc && OverOp != OO_None)
8014 S.LookupOverloadedOperatorName(OverOp, Sc, LHS->getType(),
8015 RHS->getType(), Functions);
8016
8017 // Build the (potentially-overloaded, potentially-dependent)
8018 // binary operation.
8019 return S.CreateOverloadedBinOp(OpLoc, Opc, Functions, LHS, RHS);
8020}
8021
John McCall60d7b3a2010-08-24 06:29:42 +00008022ExprResult Sema::BuildBinOp(Scope *S, SourceLocation OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00008023 BinaryOperatorKind Opc,
Richard Trieubefece12011-09-07 02:02:10 +00008024 Expr *LHSExpr, Expr *RHSExpr) {
John McCallac516502011-10-28 01:04:34 +00008025 // We want to end up calling one of checkPseudoObjectAssignment
8026 // (if the LHS is a pseudo-object), BuildOverloadedBinOp (if
8027 // both expressions are overloadable or either is type-dependent),
8028 // or CreateBuiltinBinOp (in any other case). We also want to get
8029 // any placeholder types out of the way.
8030
John McCall3c3b7f92011-10-25 17:37:35 +00008031 // Handle pseudo-objects in the LHS.
8032 if (const BuiltinType *pty = LHSExpr->getType()->getAsPlaceholderType()) {
8033 // Assignments with a pseudo-object l-value need special analysis.
8034 if (pty->getKind() == BuiltinType::PseudoObject &&
8035 BinaryOperator::isAssignmentOp(Opc))
8036 return checkPseudoObjectAssignment(S, OpLoc, Opc, LHSExpr, RHSExpr);
8037
8038 // Don't resolve overloads if the other type is overloadable.
8039 if (pty->getKind() == BuiltinType::Overload) {
8040 // We can't actually test that if we still have a placeholder,
8041 // though. Fortunately, none of the exceptions we see in that
John McCallac516502011-10-28 01:04:34 +00008042 // code below are valid when the LHS is an overload set. Note
8043 // that an overload set can be dependently-typed, but it never
8044 // instantiates to having an overloadable type.
John McCall3c3b7f92011-10-25 17:37:35 +00008045 ExprResult resolvedRHS = CheckPlaceholderExpr(RHSExpr);
8046 if (resolvedRHS.isInvalid()) return ExprError();
8047 RHSExpr = resolvedRHS.take();
8048
John McCallac516502011-10-28 01:04:34 +00008049 if (RHSExpr->isTypeDependent() ||
8050 RHSExpr->getType()->isOverloadableType())
John McCall3c3b7f92011-10-25 17:37:35 +00008051 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
8052 }
8053
8054 ExprResult LHS = CheckPlaceholderExpr(LHSExpr);
8055 if (LHS.isInvalid()) return ExprError();
8056 LHSExpr = LHS.take();
8057 }
8058
8059 // Handle pseudo-objects in the RHS.
8060 if (const BuiltinType *pty = RHSExpr->getType()->getAsPlaceholderType()) {
8061 // An overload in the RHS can potentially be resolved by the type
8062 // being assigned to.
John McCallac516502011-10-28 01:04:34 +00008063 if (Opc == BO_Assign && pty->getKind() == BuiltinType::Overload) {
8064 if (LHSExpr->isTypeDependent() || RHSExpr->isTypeDependent())
8065 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
8066
John McCall3c3b7f92011-10-25 17:37:35 +00008067 return CreateBuiltinBinOp(OpLoc, Opc, LHSExpr, RHSExpr);
John McCallac516502011-10-28 01:04:34 +00008068 }
John McCall3c3b7f92011-10-25 17:37:35 +00008069
8070 // Don't resolve overloads if the other type is overloadable.
8071 if (pty->getKind() == BuiltinType::Overload &&
8072 LHSExpr->getType()->isOverloadableType())
8073 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
8074
8075 ExprResult resolvedRHS = CheckPlaceholderExpr(RHSExpr);
8076 if (!resolvedRHS.isUsable()) return ExprError();
8077 RHSExpr = resolvedRHS.take();
8078 }
8079
John McCall01b2e4e2010-12-06 05:26:58 +00008080 if (getLangOptions().CPlusPlus) {
John McCallac516502011-10-28 01:04:34 +00008081 // If either expression is type-dependent, always build an
8082 // overloaded op.
8083 if (LHSExpr->isTypeDependent() || RHSExpr->isTypeDependent())
8084 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008085
John McCallac516502011-10-28 01:04:34 +00008086 // Otherwise, build an overloaded op if either expression has an
8087 // overloadable type.
8088 if (LHSExpr->getType()->isOverloadableType() ||
8089 RHSExpr->getType()->isOverloadableType())
John McCall3c3b7f92011-10-25 17:37:35 +00008090 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00008091 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008092
Douglas Gregoreaebc752008-11-06 23:29:22 +00008093 // Build a built-in binary operation.
Richard Trieubefece12011-09-07 02:02:10 +00008094 return CreateBuiltinBinOp(OpLoc, Opc, LHSExpr, RHSExpr);
Reid Spencer5f016e22007-07-11 17:01:13 +00008095}
8096
John McCall60d7b3a2010-08-24 06:29:42 +00008097ExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
Argyrios Kyrtzidisb1fa3dc2011-01-05 20:09:36 +00008098 UnaryOperatorKind Opc,
John Wiegley429bb272011-04-08 18:41:53 +00008099 Expr *InputExpr) {
8100 ExprResult Input = Owned(InputExpr);
John McCallf89e55a2010-11-18 06:31:45 +00008101 ExprValueKind VK = VK_RValue;
8102 ExprObjectKind OK = OK_Ordinary;
Reid Spencer5f016e22007-07-11 17:01:13 +00008103 QualType resultType;
8104 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00008105 case UO_PreInc:
8106 case UO_PreDec:
8107 case UO_PostInc:
8108 case UO_PostDec:
John Wiegley429bb272011-04-08 18:41:53 +00008109 resultType = CheckIncrementDecrementOperand(*this, Input.get(), VK, OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00008110 Opc == UO_PreInc ||
8111 Opc == UO_PostInc,
8112 Opc == UO_PreInc ||
8113 Opc == UO_PreDec);
Reid Spencer5f016e22007-07-11 17:01:13 +00008114 break;
John McCall2de56d12010-08-25 11:45:40 +00008115 case UO_AddrOf:
John McCall3c3b7f92011-10-25 17:37:35 +00008116 resultType = CheckAddressOfOperand(*this, Input, OpLoc);
Reid Spencer5f016e22007-07-11 17:01:13 +00008117 break;
John McCall1de4d4e2011-04-07 08:22:57 +00008118 case UO_Deref: {
John Wiegley429bb272011-04-08 18:41:53 +00008119 Input = DefaultFunctionArrayLvalueConversion(Input.take());
8120 resultType = CheckIndirectionOperand(*this, Input.get(), VK, OpLoc);
Reid Spencer5f016e22007-07-11 17:01:13 +00008121 break;
John McCall1de4d4e2011-04-07 08:22:57 +00008122 }
John McCall2de56d12010-08-25 11:45:40 +00008123 case UO_Plus:
8124 case UO_Minus:
John Wiegley429bb272011-04-08 18:41:53 +00008125 Input = UsualUnaryConversions(Input.take());
8126 if (Input.isInvalid()) return ExprError();
8127 resultType = Input.get()->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00008128 if (resultType->isDependentType())
8129 break;
Douglas Gregor00619622010-06-22 23:41:02 +00008130 if (resultType->isArithmeticType() || // C99 6.5.3.3p1
8131 resultType->isVectorType())
Douglas Gregor74253732008-11-19 15:42:04 +00008132 break;
8133 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7
8134 resultType->isEnumeralType())
8135 break;
8136 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6
John McCall2de56d12010-08-25 11:45:40 +00008137 Opc == UO_Plus &&
Douglas Gregor74253732008-11-19 15:42:04 +00008138 resultType->isPointerType())
8139 break;
8140
Sebastian Redl0eb23302009-01-19 00:08:26 +00008141 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley429bb272011-04-08 18:41:53 +00008142 << resultType << Input.get()->getSourceRange());
8143
John McCall2de56d12010-08-25 11:45:40 +00008144 case UO_Not: // bitwise complement
John Wiegley429bb272011-04-08 18:41:53 +00008145 Input = UsualUnaryConversions(Input.take());
8146 if (Input.isInvalid()) return ExprError();
8147 resultType = Input.get()->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00008148 if (resultType->isDependentType())
8149 break;
Chris Lattner02a65142008-07-25 23:52:49 +00008150 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension.
8151 if (resultType->isComplexType() || resultType->isComplexIntegerType())
8152 // C99 does not support '~' for complex conjugation.
Chris Lattnerd3a94e22008-11-20 06:06:08 +00008153 Diag(OpLoc, diag::ext_integer_complement_complex)
John Wiegley429bb272011-04-08 18:41:53 +00008154 << resultType << Input.get()->getSourceRange();
John McCall2cd11fe2010-10-12 02:09:17 +00008155 else if (resultType->hasIntegerRepresentation())
8156 break;
John McCall3c3b7f92011-10-25 17:37:35 +00008157 else {
Sebastian Redl0eb23302009-01-19 00:08:26 +00008158 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley429bb272011-04-08 18:41:53 +00008159 << resultType << Input.get()->getSourceRange());
John McCall2cd11fe2010-10-12 02:09:17 +00008160 }
Reid Spencer5f016e22007-07-11 17:01:13 +00008161 break;
John Wiegley429bb272011-04-08 18:41:53 +00008162
John McCall2de56d12010-08-25 11:45:40 +00008163 case UO_LNot: // logical negation
Reid Spencer5f016e22007-07-11 17:01:13 +00008164 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5).
John Wiegley429bb272011-04-08 18:41:53 +00008165 Input = DefaultFunctionArrayLvalueConversion(Input.take());
8166 if (Input.isInvalid()) return ExprError();
8167 resultType = Input.get()->getType();
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +00008168
8169 // Though we still have to promote half FP to float...
8170 if (resultType->isHalfType()) {
8171 Input = ImpCastExprToType(Input.take(), Context.FloatTy, CK_FloatingCast).take();
8172 resultType = Context.FloatTy;
8173 }
8174
Sebastian Redl28507842009-02-26 14:39:58 +00008175 if (resultType->isDependentType())
8176 break;
Abramo Bagnara737d5442011-04-07 09:26:19 +00008177 if (resultType->isScalarType()) {
8178 // C99 6.5.3.3p1: ok, fallthrough;
8179 if (Context.getLangOptions().CPlusPlus) {
8180 // C++03 [expr.unary.op]p8, C++0x [expr.unary.op]p9:
8181 // operand contextually converted to bool.
John Wiegley429bb272011-04-08 18:41:53 +00008182 Input = ImpCastExprToType(Input.take(), Context.BoolTy,
8183 ScalarTypeToBooleanCastKind(resultType));
Abramo Bagnara737d5442011-04-07 09:26:19 +00008184 }
John McCall2cd11fe2010-10-12 02:09:17 +00008185 } else {
Sebastian Redl0eb23302009-01-19 00:08:26 +00008186 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley429bb272011-04-08 18:41:53 +00008187 << resultType << Input.get()->getSourceRange());
John McCall2cd11fe2010-10-12 02:09:17 +00008188 }
Douglas Gregorea844f32010-09-20 17:13:33 +00008189
Reid Spencer5f016e22007-07-11 17:01:13 +00008190 // LNot always has type int. C99 6.5.3.3p5.
Sebastian Redl0eb23302009-01-19 00:08:26 +00008191 // In C++, it's bool. C++ 5.3.1p8
Argyrios Kyrtzidis16f744b2011-02-18 20:55:15 +00008192 resultType = Context.getLogicalOperationType();
Reid Spencer5f016e22007-07-11 17:01:13 +00008193 break;
John McCall2de56d12010-08-25 11:45:40 +00008194 case UO_Real:
8195 case UO_Imag:
John McCall09431682010-11-18 19:01:18 +00008196 resultType = CheckRealImagOperand(*this, Input, OpLoc, Opc == UO_Real);
John McCallf89e55a2010-11-18 06:31:45 +00008197 // _Real and _Imag map ordinary l-values into ordinary l-values.
John Wiegley429bb272011-04-08 18:41:53 +00008198 if (Input.isInvalid()) return ExprError();
8199 if (Input.get()->getValueKind() != VK_RValue &&
8200 Input.get()->getObjectKind() == OK_Ordinary)
8201 VK = Input.get()->getValueKind();
Chris Lattnerdbb36972007-08-24 21:16:53 +00008202 break;
John McCall2de56d12010-08-25 11:45:40 +00008203 case UO_Extension:
John Wiegley429bb272011-04-08 18:41:53 +00008204 resultType = Input.get()->getType();
8205 VK = Input.get()->getValueKind();
8206 OK = Input.get()->getObjectKind();
Reid Spencer5f016e22007-07-11 17:01:13 +00008207 break;
8208 }
John Wiegley429bb272011-04-08 18:41:53 +00008209 if (resultType.isNull() || Input.isInvalid())
Sebastian Redl0eb23302009-01-19 00:08:26 +00008210 return ExprError();
Douglas Gregorbc736fc2009-03-13 23:49:33 +00008211
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00008212 // Check for array bounds violations in the operand of the UnaryOperator,
8213 // except for the '*' and '&' operators that have to be handled specially
8214 // by CheckArrayAccess (as there are special cases like &array[arraysize]
8215 // that are explicitly defined as valid by the standard).
8216 if (Opc != UO_AddrOf && Opc != UO_Deref)
8217 CheckArrayAccess(Input.get());
8218
John Wiegley429bb272011-04-08 18:41:53 +00008219 return Owned(new (Context) UnaryOperator(Input.take(), Opc, resultType,
John McCallf89e55a2010-11-18 06:31:45 +00008220 VK, OK, OpLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00008221}
8222
John McCall60d7b3a2010-08-24 06:29:42 +00008223ExprResult Sema::BuildUnaryOp(Scope *S, SourceLocation OpLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00008224 UnaryOperatorKind Opc, Expr *Input) {
John McCall3c3b7f92011-10-25 17:37:35 +00008225 // First things first: handle placeholders so that the
8226 // overloaded-operator check considers the right type.
8227 if (const BuiltinType *pty = Input->getType()->getAsPlaceholderType()) {
8228 // Increment and decrement of pseudo-object references.
8229 if (pty->getKind() == BuiltinType::PseudoObject &&
8230 UnaryOperator::isIncrementDecrementOp(Opc))
8231 return checkPseudoObjectIncDec(S, OpLoc, Opc, Input);
8232
8233 // extension is always a builtin operator.
8234 if (Opc == UO_Extension)
8235 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
8236
8237 // & gets special logic for several kinds of placeholder.
8238 // The builtin code knows what to do.
8239 if (Opc == UO_AddrOf &&
8240 (pty->getKind() == BuiltinType::Overload ||
8241 pty->getKind() == BuiltinType::UnknownAny ||
8242 pty->getKind() == BuiltinType::BoundMember))
8243 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
8244
8245 // Anything else needs to be handled now.
8246 ExprResult Result = CheckPlaceholderExpr(Input);
8247 if (Result.isInvalid()) return ExprError();
8248 Input = Result.take();
8249 }
8250
Anders Carlssona8a1e3d2009-11-14 21:26:41 +00008251 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType() &&
Eli Friedman957c0942010-09-05 23:15:52 +00008252 UnaryOperator::getOverloadedOperator(Opc) != OO_None) {
Douglas Gregorbc736fc2009-03-13 23:49:33 +00008253 // Find all of the overloaded operators visible from this
8254 // point. We perform both an operator-name lookup from the local
8255 // scope and an argument-dependent lookup based on the types of
8256 // the arguments.
John McCall6e266892010-01-26 03:27:55 +00008257 UnresolvedSet<16> Functions;
Douglas Gregorbc736fc2009-03-13 23:49:33 +00008258 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc);
John McCall6e266892010-01-26 03:27:55 +00008259 if (S && OverOp != OO_None)
8260 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(),
8261 Functions);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008262
John McCall9ae2f072010-08-23 23:25:46 +00008263 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, Input);
Douglas Gregorbc736fc2009-03-13 23:49:33 +00008264 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008265
John McCall9ae2f072010-08-23 23:25:46 +00008266 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
Douglas Gregorbc736fc2009-03-13 23:49:33 +00008267}
8268
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00008269// Unary Operators. 'Tok' is the token for the operator.
John McCall60d7b3a2010-08-24 06:29:42 +00008270ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
John McCallf4c73712011-01-19 06:33:43 +00008271 tok::TokenKind Op, Expr *Input) {
John McCall9ae2f072010-08-23 23:25:46 +00008272 return BuildUnaryOp(S, OpLoc, ConvertTokenKindToUnaryOpcode(Op), Input);
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00008273}
8274
Steve Naroff1b273c42007-09-16 14:56:35 +00008275/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
Chris Lattnerad8dcf42011-02-17 07:39:24 +00008276ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
Chris Lattner57ad3782011-02-17 20:34:02 +00008277 LabelDecl *TheDecl) {
Chris Lattnerad8dcf42011-02-17 07:39:24 +00008278 TheDecl->setUsed();
Reid Spencer5f016e22007-07-11 17:01:13 +00008279 // Create the AST node. The address of a label always has type 'void*'.
Chris Lattnerad8dcf42011-02-17 07:39:24 +00008280 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, TheDecl,
Sebastian Redlf53597f2009-03-15 17:47:39 +00008281 Context.getPointerType(Context.VoidTy)));
Reid Spencer5f016e22007-07-11 17:01:13 +00008282}
8283
John McCallf85e1932011-06-15 23:02:42 +00008284/// Given the last statement in a statement-expression, check whether
8285/// the result is a producing expression (like a call to an
8286/// ns_returns_retained function) and, if so, rebuild it to hoist the
8287/// release out of the full-expression. Otherwise, return null.
8288/// Cannot fail.
Richard Trieuccd891a2011-09-09 01:45:06 +00008289static Expr *maybeRebuildARCConsumingStmt(Stmt *Statement) {
John McCallf85e1932011-06-15 23:02:42 +00008290 // Should always be wrapped with one of these.
Richard Trieuccd891a2011-09-09 01:45:06 +00008291 ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(Statement);
John McCallf85e1932011-06-15 23:02:42 +00008292 if (!cleanups) return 0;
8293
8294 ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(cleanups->getSubExpr());
John McCall33e56f32011-09-10 06:18:15 +00008295 if (!cast || cast->getCastKind() != CK_ARCConsumeObject)
John McCallf85e1932011-06-15 23:02:42 +00008296 return 0;
8297
8298 // Splice out the cast. This shouldn't modify any interesting
8299 // features of the statement.
8300 Expr *producer = cast->getSubExpr();
8301 assert(producer->getType() == cast->getType());
8302 assert(producer->getValueKind() == cast->getValueKind());
8303 cleanups->setSubExpr(producer);
8304 return cleanups;
8305}
8306
John McCall60d7b3a2010-08-24 06:29:42 +00008307ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00008308Sema::ActOnStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
Sebastian Redlf53597f2009-03-15 17:47:39 +00008309 SourceLocation RPLoc) { // "({..})"
Chris Lattnerab18c4c2007-07-24 16:58:17 +00008310 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!");
8311 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt);
8312
Douglas Gregordd8f5692010-03-10 04:54:39 +00008313 bool isFileScope
8314 = (getCurFunctionOrMethodDecl() == 0) && (getCurBlock() == 0);
Chris Lattner4a049f02009-04-25 19:11:05 +00008315 if (isFileScope)
Sebastian Redlf53597f2009-03-15 17:47:39 +00008316 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope));
Eli Friedmandca2b732009-01-24 23:09:00 +00008317
Chris Lattnerab18c4c2007-07-24 16:58:17 +00008318 // FIXME: there are a variety of strange constraints to enforce here, for
8319 // example, it is not possible to goto into a stmt expression apparently.
8320 // More semantic analysis is needed.
Mike Stumpeed9cac2009-02-19 03:04:26 +00008321
Chris Lattnerab18c4c2007-07-24 16:58:17 +00008322 // If there are sub stmts in the compound stmt, take the type of the last one
8323 // as the type of the stmtexpr.
8324 QualType Ty = Context.VoidTy;
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008325 bool StmtExprMayBindToTemp = false;
Chris Lattner611b2ec2008-07-26 19:51:01 +00008326 if (!Compound->body_empty()) {
8327 Stmt *LastStmt = Compound->body_back();
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008328 LabelStmt *LastLabelStmt = 0;
Chris Lattner611b2ec2008-07-26 19:51:01 +00008329 // If LastStmt is a label, skip down through into the body.
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008330 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) {
8331 LastLabelStmt = Label;
Chris Lattner611b2ec2008-07-26 19:51:01 +00008332 LastStmt = Label->getSubStmt();
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008333 }
John McCallf85e1932011-06-15 23:02:42 +00008334
John Wiegley429bb272011-04-08 18:41:53 +00008335 if (Expr *LastE = dyn_cast<Expr>(LastStmt)) {
John McCallf6a16482010-12-04 03:47:34 +00008336 // Do function/array conversion on the last expression, but not
8337 // lvalue-to-rvalue. However, initialize an unqualified type.
John Wiegley429bb272011-04-08 18:41:53 +00008338 ExprResult LastExpr = DefaultFunctionArrayConversion(LastE);
8339 if (LastExpr.isInvalid())
8340 return ExprError();
8341 Ty = LastExpr.get()->getType().getUnqualifiedType();
John McCallf6a16482010-12-04 03:47:34 +00008342
John Wiegley429bb272011-04-08 18:41:53 +00008343 if (!Ty->isDependentType() && !LastExpr.get()->isTypeDependent()) {
John McCallf85e1932011-06-15 23:02:42 +00008344 // In ARC, if the final expression ends in a consume, splice
8345 // the consume out and bind it later. In the alternate case
8346 // (when dealing with a retainable type), the result
8347 // initialization will create a produce. In both cases the
8348 // result will be +1, and we'll need to balance that out with
8349 // a bind.
8350 if (Expr *rebuiltLastStmt
8351 = maybeRebuildARCConsumingStmt(LastExpr.get())) {
8352 LastExpr = rebuiltLastStmt;
8353 } else {
8354 LastExpr = PerformCopyInitialization(
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008355 InitializedEntity::InitializeResult(LPLoc,
8356 Ty,
8357 false),
8358 SourceLocation(),
John McCallf85e1932011-06-15 23:02:42 +00008359 LastExpr);
8360 }
8361
John Wiegley429bb272011-04-08 18:41:53 +00008362 if (LastExpr.isInvalid())
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008363 return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00008364 if (LastExpr.get() != 0) {
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008365 if (!LastLabelStmt)
John Wiegley429bb272011-04-08 18:41:53 +00008366 Compound->setLastStmt(LastExpr.take());
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008367 else
John Wiegley429bb272011-04-08 18:41:53 +00008368 LastLabelStmt->setSubStmt(LastExpr.take());
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008369 StmtExprMayBindToTemp = true;
8370 }
8371 }
8372 }
Chris Lattner611b2ec2008-07-26 19:51:01 +00008373 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008374
Eli Friedmanb1d796d2009-03-23 00:24:07 +00008375 // FIXME: Check that expression type is complete/non-abstract; statement
8376 // expressions are not lvalues.
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008377 Expr *ResStmtExpr = new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc);
8378 if (StmtExprMayBindToTemp)
8379 return MaybeBindToTemporary(ResStmtExpr);
8380 return Owned(ResStmtExpr);
Chris Lattnerab18c4c2007-07-24 16:58:17 +00008381}
Steve Naroffd34e9152007-08-01 22:05:33 +00008382
John McCall60d7b3a2010-08-24 06:29:42 +00008383ExprResult Sema::BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
John McCall2cd11fe2010-10-12 02:09:17 +00008384 TypeSourceInfo *TInfo,
8385 OffsetOfComponent *CompPtr,
8386 unsigned NumComponents,
8387 SourceLocation RParenLoc) {
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008388 QualType ArgTy = TInfo->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00008389 bool Dependent = ArgTy->isDependentType();
Abramo Bagnarabd054db2010-05-20 10:00:11 +00008390 SourceRange TypeRange = TInfo->getTypeLoc().getLocalSourceRange();
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008391
Chris Lattner73d0d4f2007-08-30 17:45:32 +00008392 // We must have at least one component that refers to the type, and the first
8393 // one is known to be a field designator. Verify that the ArgTy represents
8394 // a struct/union/class.
Sebastian Redl28507842009-02-26 14:39:58 +00008395 if (!Dependent && !ArgTy->isRecordType())
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008396 return ExprError(Diag(BuiltinLoc, diag::err_offsetof_record_type)
8397 << ArgTy << TypeRange);
8398
8399 // Type must be complete per C99 7.17p3 because a declaring a variable
8400 // with an incomplete type would be ill-formed.
8401 if (!Dependent
8402 && RequireCompleteType(BuiltinLoc, ArgTy,
8403 PDiag(diag::err_offsetof_incomplete_type)
8404 << TypeRange))
8405 return ExprError();
8406
Chris Lattner9e2b75c2007-08-31 21:49:13 +00008407 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a
8408 // GCC extension, diagnose them.
Eli Friedman35183ac2009-02-27 06:44:11 +00008409 // FIXME: This diagnostic isn't actually visible because the location is in
8410 // a system header!
Chris Lattner9e2b75c2007-08-31 21:49:13 +00008411 if (NumComponents != 1)
Chris Lattnerdcd5ef12008-11-19 05:27:50 +00008412 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator)
8413 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd);
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008414
8415 bool DidWarnAboutNonPOD = false;
8416 QualType CurrentType = ArgTy;
8417 typedef OffsetOfExpr::OffsetOfNode OffsetOfNode;
Chris Lattner5f9e2722011-07-23 10:55:15 +00008418 SmallVector<OffsetOfNode, 4> Comps;
8419 SmallVector<Expr*, 4> Exprs;
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008420 for (unsigned i = 0; i != NumComponents; ++i) {
8421 const OffsetOfComponent &OC = CompPtr[i];
8422 if (OC.isBrackets) {
8423 // Offset of an array sub-field. TODO: Should we allow vector elements?
8424 if (!CurrentType->isDependentType()) {
8425 const ArrayType *AT = Context.getAsArrayType(CurrentType);
8426 if(!AT)
8427 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type)
8428 << CurrentType);
8429 CurrentType = AT->getElementType();
8430 } else
8431 CurrentType = Context.DependentTy;
8432
Richard Smithea011432011-10-17 23:29:39 +00008433 ExprResult IdxRval = DefaultLvalueConversion(static_cast<Expr*>(OC.U.E));
8434 if (IdxRval.isInvalid())
8435 return ExprError();
8436 Expr *Idx = IdxRval.take();
8437
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008438 // The expression must be an integral expression.
8439 // FIXME: An integral constant expression?
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008440 if (!Idx->isTypeDependent() && !Idx->isValueDependent() &&
8441 !Idx->getType()->isIntegerType())
8442 return ExprError(Diag(Idx->getLocStart(),
8443 diag::err_typecheck_subscript_not_integer)
8444 << Idx->getSourceRange());
Richard Smithd82e5d32011-10-17 05:48:07 +00008445
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008446 // Record this array index.
8447 Comps.push_back(OffsetOfNode(OC.LocStart, Exprs.size(), OC.LocEnd));
Richard Smithea011432011-10-17 23:29:39 +00008448 Exprs.push_back(Idx);
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008449 continue;
8450 }
8451
8452 // Offset of a field.
8453 if (CurrentType->isDependentType()) {
8454 // We have the offset of a field, but we can't look into the dependent
8455 // type. Just record the identifier of the field.
8456 Comps.push_back(OffsetOfNode(OC.LocStart, OC.U.IdentInfo, OC.LocEnd));
8457 CurrentType = Context.DependentTy;
8458 continue;
8459 }
8460
8461 // We need to have a complete type to look into.
8462 if (RequireCompleteType(OC.LocStart, CurrentType,
8463 diag::err_offsetof_incomplete_type))
8464 return ExprError();
8465
8466 // Look for the designated field.
8467 const RecordType *RC = CurrentType->getAs<RecordType>();
8468 if (!RC)
8469 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type)
8470 << CurrentType);
8471 RecordDecl *RD = RC->getDecl();
8472
8473 // C++ [lib.support.types]p5:
8474 // The macro offsetof accepts a restricted set of type arguments in this
8475 // International Standard. type shall be a POD structure or a POD union
8476 // (clause 9).
8477 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
8478 if (!CRD->isPOD() && !DidWarnAboutNonPOD &&
Ted Kremenek762696f2011-02-23 01:51:43 +00008479 DiagRuntimeBehavior(BuiltinLoc, 0,
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008480 PDiag(diag::warn_offsetof_non_pod_type)
8481 << SourceRange(CompPtr[0].LocStart, OC.LocEnd)
8482 << CurrentType))
8483 DidWarnAboutNonPOD = true;
8484 }
8485
8486 // Look for the field.
8487 LookupResult R(*this, OC.U.IdentInfo, OC.LocStart, LookupMemberName);
8488 LookupQualifiedName(R, RD);
8489 FieldDecl *MemberDecl = R.getAsSingle<FieldDecl>();
Francois Pichet87c2e122010-11-21 06:08:52 +00008490 IndirectFieldDecl *IndirectMemberDecl = 0;
8491 if (!MemberDecl) {
Benjamin Kramerd9811462010-11-21 14:11:41 +00008492 if ((IndirectMemberDecl = R.getAsSingle<IndirectFieldDecl>()))
Francois Pichet87c2e122010-11-21 06:08:52 +00008493 MemberDecl = IndirectMemberDecl->getAnonField();
8494 }
8495
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008496 if (!MemberDecl)
8497 return ExprError(Diag(BuiltinLoc, diag::err_no_member)
8498 << OC.U.IdentInfo << RD << SourceRange(OC.LocStart,
8499 OC.LocEnd));
8500
Douglas Gregor9d5d60f2010-04-28 22:36:06 +00008501 // C99 7.17p3:
8502 // (If the specified member is a bit-field, the behavior is undefined.)
8503 //
8504 // We diagnose this as an error.
Richard Smitha6b8b2c2011-10-10 18:28:20 +00008505 if (MemberDecl->isBitField()) {
Douglas Gregor9d5d60f2010-04-28 22:36:06 +00008506 Diag(OC.LocEnd, diag::err_offsetof_bitfield)
8507 << MemberDecl->getDeclName()
8508 << SourceRange(BuiltinLoc, RParenLoc);
8509 Diag(MemberDecl->getLocation(), diag::note_bitfield_decl);
8510 return ExprError();
8511 }
Eli Friedman19410a72010-08-05 10:11:36 +00008512
8513 RecordDecl *Parent = MemberDecl->getParent();
Francois Pichet87c2e122010-11-21 06:08:52 +00008514 if (IndirectMemberDecl)
8515 Parent = cast<RecordDecl>(IndirectMemberDecl->getDeclContext());
Eli Friedman19410a72010-08-05 10:11:36 +00008516
Douglas Gregorcc8a5d52010-04-29 00:18:15 +00008517 // If the member was found in a base class, introduce OffsetOfNodes for
8518 // the base class indirections.
8519 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
8520 /*DetectVirtual=*/false);
Eli Friedman19410a72010-08-05 10:11:36 +00008521 if (IsDerivedFrom(CurrentType, Context.getTypeDeclType(Parent), Paths)) {
Douglas Gregorcc8a5d52010-04-29 00:18:15 +00008522 CXXBasePath &Path = Paths.front();
8523 for (CXXBasePath::iterator B = Path.begin(), BEnd = Path.end();
8524 B != BEnd; ++B)
8525 Comps.push_back(OffsetOfNode(B->Base));
8526 }
Eli Friedman19410a72010-08-05 10:11:36 +00008527
Francois Pichet87c2e122010-11-21 06:08:52 +00008528 if (IndirectMemberDecl) {
8529 for (IndirectFieldDecl::chain_iterator FI =
8530 IndirectMemberDecl->chain_begin(),
8531 FEnd = IndirectMemberDecl->chain_end(); FI != FEnd; FI++) {
8532 assert(isa<FieldDecl>(*FI));
8533 Comps.push_back(OffsetOfNode(OC.LocStart,
8534 cast<FieldDecl>(*FI), OC.LocEnd));
8535 }
8536 } else
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008537 Comps.push_back(OffsetOfNode(OC.LocStart, MemberDecl, OC.LocEnd));
Francois Pichet87c2e122010-11-21 06:08:52 +00008538
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008539 CurrentType = MemberDecl->getType().getNonReferenceType();
8540 }
8541
8542 return Owned(OffsetOfExpr::Create(Context, Context.getSizeType(), BuiltinLoc,
8543 TInfo, Comps.data(), Comps.size(),
8544 Exprs.data(), Exprs.size(), RParenLoc));
8545}
Mike Stumpeed9cac2009-02-19 03:04:26 +00008546
John McCall60d7b3a2010-08-24 06:29:42 +00008547ExprResult Sema::ActOnBuiltinOffsetOf(Scope *S,
John McCall2cd11fe2010-10-12 02:09:17 +00008548 SourceLocation BuiltinLoc,
8549 SourceLocation TypeLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00008550 ParsedType ParsedArgTy,
John McCall2cd11fe2010-10-12 02:09:17 +00008551 OffsetOfComponent *CompPtr,
8552 unsigned NumComponents,
Richard Trieuccd891a2011-09-09 01:45:06 +00008553 SourceLocation RParenLoc) {
John McCall2cd11fe2010-10-12 02:09:17 +00008554
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008555 TypeSourceInfo *ArgTInfo;
Richard Trieuccd891a2011-09-09 01:45:06 +00008556 QualType ArgTy = GetTypeFromParser(ParsedArgTy, &ArgTInfo);
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008557 if (ArgTy.isNull())
8558 return ExprError();
8559
Eli Friedman5a15dc12010-08-05 10:15:45 +00008560 if (!ArgTInfo)
8561 ArgTInfo = Context.getTrivialTypeSourceInfo(ArgTy, TypeLoc);
8562
8563 return BuildBuiltinOffsetOf(BuiltinLoc, ArgTInfo, CompPtr, NumComponents,
Richard Trieuccd891a2011-09-09 01:45:06 +00008564 RParenLoc);
Chris Lattner73d0d4f2007-08-30 17:45:32 +00008565}
8566
8567
John McCall60d7b3a2010-08-24 06:29:42 +00008568ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc,
John McCall2cd11fe2010-10-12 02:09:17 +00008569 Expr *CondExpr,
8570 Expr *LHSExpr, Expr *RHSExpr,
8571 SourceLocation RPLoc) {
Steve Naroffd04fdd52007-08-03 21:21:27 +00008572 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)");
8573
John McCallf89e55a2010-11-18 06:31:45 +00008574 ExprValueKind VK = VK_RValue;
8575 ExprObjectKind OK = OK_Ordinary;
Sebastian Redl28507842009-02-26 14:39:58 +00008576 QualType resType;
Douglas Gregorce940492009-09-25 04:25:58 +00008577 bool ValueDependent = false;
Douglas Gregorc9ecc572009-05-19 22:43:30 +00008578 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) {
Sebastian Redl28507842009-02-26 14:39:58 +00008579 resType = Context.DependentTy;
Douglas Gregorce940492009-09-25 04:25:58 +00008580 ValueDependent = true;
Sebastian Redl28507842009-02-26 14:39:58 +00008581 } else {
8582 // The conditional expression is required to be a constant expression.
8583 llvm::APSInt condEval(32);
8584 SourceLocation ExpLoc;
8585 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc))
Sebastian Redlf53597f2009-03-15 17:47:39 +00008586 return ExprError(Diag(ExpLoc,
8587 diag::err_typecheck_choose_expr_requires_constant)
8588 << CondExpr->getSourceRange());
Steve Naroffd04fdd52007-08-03 21:21:27 +00008589
Sebastian Redl28507842009-02-26 14:39:58 +00008590 // If the condition is > zero, then the AST type is the same as the LSHExpr.
John McCallf89e55a2010-11-18 06:31:45 +00008591 Expr *ActiveExpr = condEval.getZExtValue() ? LHSExpr : RHSExpr;
8592
8593 resType = ActiveExpr->getType();
8594 ValueDependent = ActiveExpr->isValueDependent();
8595 VK = ActiveExpr->getValueKind();
8596 OK = ActiveExpr->getObjectKind();
Sebastian Redl28507842009-02-26 14:39:58 +00008597 }
8598
Sebastian Redlf53597f2009-03-15 17:47:39 +00008599 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr,
John McCallf89e55a2010-11-18 06:31:45 +00008600 resType, VK, OK, RPLoc,
Douglas Gregorce940492009-09-25 04:25:58 +00008601 resType->isDependentType(),
8602 ValueDependent));
Steve Naroffd04fdd52007-08-03 21:21:27 +00008603}
8604
Steve Naroff4eb206b2008-09-03 18:15:37 +00008605//===----------------------------------------------------------------------===//
8606// Clang Extensions.
8607//===----------------------------------------------------------------------===//
8608
8609/// ActOnBlockStart - This callback is invoked when a block literal is started.
Richard Trieuccd891a2011-09-09 01:45:06 +00008610void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *CurScope) {
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008611 BlockDecl *Block = BlockDecl::Create(Context, CurContext, CaretLoc);
Richard Trieuccd891a2011-09-09 01:45:06 +00008612 PushBlockScope(CurScope, Block);
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008613 CurContext->addDecl(Block);
Richard Trieuccd891a2011-09-09 01:45:06 +00008614 if (CurScope)
8615 PushDeclContext(CurScope, Block);
Fariborz Jahaniana729da22010-07-09 18:44:02 +00008616 else
8617 CurContext = Block;
John McCall538773c2011-11-11 03:19:12 +00008618
8619 // Enter a new evaluation context to insulate the block from any
8620 // cleanups from the enclosing full-expression.
8621 PushExpressionEvaluationContext(PotentiallyEvaluated);
Steve Naroff090276f2008-10-10 01:28:17 +00008622}
8623
Mike Stump98eb8a72009-02-04 22:31:32 +00008624void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) {
Mike Stumpaf199f32009-05-07 18:43:07 +00008625 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!");
John McCall711c52b2011-01-05 12:14:39 +00008626 assert(ParamInfo.getContext() == Declarator::BlockLiteralContext);
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008627 BlockScopeInfo *CurBlock = getCurBlock();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008628
John McCallbf1a0282010-06-04 23:28:52 +00008629 TypeSourceInfo *Sig = GetTypeForDeclarator(ParamInfo, CurScope);
John McCallbf1a0282010-06-04 23:28:52 +00008630 QualType T = Sig->getType();
Mike Stump98eb8a72009-02-04 22:31:32 +00008631
John McCall711c52b2011-01-05 12:14:39 +00008632 // GetTypeForDeclarator always produces a function type for a block
8633 // literal signature. Furthermore, it is always a FunctionProtoType
8634 // unless the function was written with a typedef.
8635 assert(T->isFunctionType() &&
8636 "GetTypeForDeclarator made a non-function block signature");
8637
8638 // Look for an explicit signature in that function type.
8639 FunctionProtoTypeLoc ExplicitSignature;
8640
8641 TypeLoc tmp = Sig->getTypeLoc().IgnoreParens();
8642 if (isa<FunctionProtoTypeLoc>(tmp)) {
8643 ExplicitSignature = cast<FunctionProtoTypeLoc>(tmp);
8644
8645 // Check whether that explicit signature was synthesized by
8646 // GetTypeForDeclarator. If so, don't save that as part of the
8647 // written signature.
Abramo Bagnara796aa442011-03-12 11:17:06 +00008648 if (ExplicitSignature.getLocalRangeBegin() ==
8649 ExplicitSignature.getLocalRangeEnd()) {
John McCall711c52b2011-01-05 12:14:39 +00008650 // This would be much cheaper if we stored TypeLocs instead of
8651 // TypeSourceInfos.
8652 TypeLoc Result = ExplicitSignature.getResultLoc();
8653 unsigned Size = Result.getFullDataSize();
8654 Sig = Context.CreateTypeSourceInfo(Result.getType(), Size);
8655 Sig->getTypeLoc().initializeFullCopy(Result, Size);
8656
8657 ExplicitSignature = FunctionProtoTypeLoc();
8658 }
John McCall82dc0092010-06-04 11:21:44 +00008659 }
Mike Stump1eb44332009-09-09 15:08:12 +00008660
John McCall711c52b2011-01-05 12:14:39 +00008661 CurBlock->TheDecl->setSignatureAsWritten(Sig);
8662 CurBlock->FunctionType = T;
8663
8664 const FunctionType *Fn = T->getAs<FunctionType>();
8665 QualType RetTy = Fn->getResultType();
8666 bool isVariadic =
8667 (isa<FunctionProtoType>(Fn) && cast<FunctionProtoType>(Fn)->isVariadic());
8668
John McCallc71a4912010-06-04 19:02:56 +00008669 CurBlock->TheDecl->setIsVariadic(isVariadic);
Douglas Gregora873dfc2010-02-03 00:27:59 +00008670
John McCall82dc0092010-06-04 11:21:44 +00008671 // Don't allow returning a objc interface by value.
8672 if (RetTy->isObjCObjectType()) {
8673 Diag(ParamInfo.getSourceRange().getBegin(),
8674 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy;
8675 return;
8676 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008677
John McCall82dc0092010-06-04 11:21:44 +00008678 // Context.DependentTy is used as a placeholder for a missing block
John McCallc71a4912010-06-04 19:02:56 +00008679 // return type. TODO: what should we do with declarators like:
8680 // ^ * { ... }
8681 // If the answer is "apply template argument deduction"....
John McCall82dc0092010-06-04 11:21:44 +00008682 if (RetTy != Context.DependentTy)
8683 CurBlock->ReturnType = RetTy;
Mike Stumpeed9cac2009-02-19 03:04:26 +00008684
John McCall82dc0092010-06-04 11:21:44 +00008685 // Push block parameters from the declarator if we had them.
Chris Lattner5f9e2722011-07-23 10:55:15 +00008686 SmallVector<ParmVarDecl*, 8> Params;
John McCall711c52b2011-01-05 12:14:39 +00008687 if (ExplicitSignature) {
8688 for (unsigned I = 0, E = ExplicitSignature.getNumArgs(); I != E; ++I) {
8689 ParmVarDecl *Param = ExplicitSignature.getArg(I);
Fariborz Jahanian9a66c302010-02-12 21:53:14 +00008690 if (Param->getIdentifier() == 0 &&
8691 !Param->isImplicit() &&
8692 !Param->isInvalidDecl() &&
8693 !getLangOptions().CPlusPlus)
8694 Diag(Param->getLocation(), diag::err_parameter_name_omitted);
John McCallc71a4912010-06-04 19:02:56 +00008695 Params.push_back(Param);
Fariborz Jahanian9a66c302010-02-12 21:53:14 +00008696 }
John McCall82dc0092010-06-04 11:21:44 +00008697
8698 // Fake up parameter variables if we have a typedef, like
8699 // ^ fntype { ... }
8700 } else if (const FunctionProtoType *Fn = T->getAs<FunctionProtoType>()) {
8701 for (FunctionProtoType::arg_type_iterator
8702 I = Fn->arg_type_begin(), E = Fn->arg_type_end(); I != E; ++I) {
8703 ParmVarDecl *Param =
8704 BuildParmVarDeclForTypedef(CurBlock->TheDecl,
8705 ParamInfo.getSourceRange().getBegin(),
8706 *I);
John McCallc71a4912010-06-04 19:02:56 +00008707 Params.push_back(Param);
John McCall82dc0092010-06-04 11:21:44 +00008708 }
Steve Naroff4eb206b2008-09-03 18:15:37 +00008709 }
John McCall82dc0092010-06-04 11:21:44 +00008710
John McCallc71a4912010-06-04 19:02:56 +00008711 // Set the parameters on the block decl.
Douglas Gregor82aa7132010-11-01 18:37:59 +00008712 if (!Params.empty()) {
David Blaikie4278c652011-09-21 18:16:56 +00008713 CurBlock->TheDecl->setParams(Params);
Douglas Gregor82aa7132010-11-01 18:37:59 +00008714 CheckParmsForFunctionDef(CurBlock->TheDecl->param_begin(),
8715 CurBlock->TheDecl->param_end(),
8716 /*CheckParameterNames=*/false);
8717 }
8718
John McCall82dc0092010-06-04 11:21:44 +00008719 // Finally we can process decl attributes.
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00008720 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo);
John McCall053f4bd2010-03-22 09:20:08 +00008721
John McCallc71a4912010-06-04 19:02:56 +00008722 if (!isVariadic && CurBlock->TheDecl->getAttr<SentinelAttr>()) {
John McCall82dc0092010-06-04 11:21:44 +00008723 Diag(ParamInfo.getAttributes()->getLoc(),
8724 diag::warn_attribute_sentinel_not_variadic) << 1;
8725 // FIXME: remove the attribute.
8726 }
8727
8728 // Put the parameter variables in scope. We can bail out immediately
8729 // if we don't have any.
John McCallc71a4912010-06-04 19:02:56 +00008730 if (Params.empty())
John McCall82dc0092010-06-04 11:21:44 +00008731 return;
8732
Steve Naroff090276f2008-10-10 01:28:17 +00008733 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(),
John McCall7a9813c2010-01-22 00:28:27 +00008734 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) {
8735 (*AI)->setOwningFunction(CurBlock->TheDecl);
8736
Steve Naroff090276f2008-10-10 01:28:17 +00008737 // If this has an identifier, add it to the scope stack.
John McCall053f4bd2010-03-22 09:20:08 +00008738 if ((*AI)->getIdentifier()) {
Argyrios Kyrtzidis08274082010-12-15 18:44:22 +00008739 CheckShadow(CurBlock->TheScope, *AI);
John McCall053f4bd2010-03-22 09:20:08 +00008740
Steve Naroff090276f2008-10-10 01:28:17 +00008741 PushOnScopeChains(*AI, CurBlock->TheScope);
John McCall053f4bd2010-03-22 09:20:08 +00008742 }
John McCall7a9813c2010-01-22 00:28:27 +00008743 }
Steve Naroff4eb206b2008-09-03 18:15:37 +00008744}
8745
8746/// ActOnBlockError - If there is an error parsing a block, this callback
8747/// is invoked to pop the information about the block from the action impl.
8748void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) {
John McCall538773c2011-11-11 03:19:12 +00008749 // Leave the expression-evaluation context.
8750 DiscardCleanupsInEvaluationContext();
8751 PopExpressionEvaluationContext();
8752
Steve Naroff4eb206b2008-09-03 18:15:37 +00008753 // Pop off CurBlock, handle nested blocks.
Chris Lattner5c59e2b2009-04-21 22:38:46 +00008754 PopDeclContext();
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008755 PopFunctionOrBlockScope();
Steve Naroff4eb206b2008-09-03 18:15:37 +00008756}
8757
8758/// ActOnBlockStmtExpr - This is called when the body of a block statement
8759/// literal was successfully completed. ^(int x){...}
John McCall60d7b3a2010-08-24 06:29:42 +00008760ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
Chris Lattnere476bdc2011-02-17 23:58:47 +00008761 Stmt *Body, Scope *CurScope) {
Chris Lattner9af55002009-03-27 04:18:06 +00008762 // If blocks are disabled, emit an error.
8763 if (!LangOpts.Blocks)
8764 Diag(CaretLoc, diag::err_blocks_disable);
Mike Stump1eb44332009-09-09 15:08:12 +00008765
John McCall538773c2011-11-11 03:19:12 +00008766 // Leave the expression-evaluation context.
8767 assert(!ExprNeedsCleanups && "cleanups within block not correctly bound!");
8768 PopExpressionEvaluationContext();
8769
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008770 BlockScopeInfo *BSI = cast<BlockScopeInfo>(FunctionScopes.back());
Fariborz Jahaniana729da22010-07-09 18:44:02 +00008771
Steve Naroff090276f2008-10-10 01:28:17 +00008772 PopDeclContext();
8773
Steve Naroff4eb206b2008-09-03 18:15:37 +00008774 QualType RetTy = Context.VoidTy;
Fariborz Jahanian7d5c74e2009-06-19 23:37:08 +00008775 if (!BSI->ReturnType.isNull())
8776 RetTy = BSI->ReturnType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00008777
Mike Stump56925862009-07-28 22:04:01 +00008778 bool NoReturn = BSI->TheDecl->getAttr<NoReturnAttr>();
Steve Naroff4eb206b2008-09-03 18:15:37 +00008779 QualType BlockTy;
John McCallc71a4912010-06-04 19:02:56 +00008780
John McCall469a1eb2011-02-02 13:00:07 +00008781 // Set the captured variables on the block.
John McCall6b5a61b2011-02-07 10:33:21 +00008782 BSI->TheDecl->setCaptures(Context, BSI->Captures.begin(), BSI->Captures.end(),
8783 BSI->CapturesCXXThis);
John McCall469a1eb2011-02-02 13:00:07 +00008784
John McCallc71a4912010-06-04 19:02:56 +00008785 // If the user wrote a function type in some form, try to use that.
8786 if (!BSI->FunctionType.isNull()) {
8787 const FunctionType *FTy = BSI->FunctionType->getAs<FunctionType>();
8788
8789 FunctionType::ExtInfo Ext = FTy->getExtInfo();
8790 if (NoReturn && !Ext.getNoReturn()) Ext = Ext.withNoReturn(true);
8791
8792 // Turn protoless block types into nullary block types.
8793 if (isa<FunctionNoProtoType>(FTy)) {
John McCalle23cf432010-12-14 08:05:40 +00008794 FunctionProtoType::ExtProtoInfo EPI;
8795 EPI.ExtInfo = Ext;
8796 BlockTy = Context.getFunctionType(RetTy, 0, 0, EPI);
John McCallc71a4912010-06-04 19:02:56 +00008797
8798 // Otherwise, if we don't need to change anything about the function type,
8799 // preserve its sugar structure.
8800 } else if (FTy->getResultType() == RetTy &&
8801 (!NoReturn || FTy->getNoReturnAttr())) {
8802 BlockTy = BSI->FunctionType;
8803
8804 // Otherwise, make the minimal modifications to the function type.
8805 } else {
8806 const FunctionProtoType *FPT = cast<FunctionProtoType>(FTy);
John McCalle23cf432010-12-14 08:05:40 +00008807 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
8808 EPI.TypeQuals = 0; // FIXME: silently?
8809 EPI.ExtInfo = Ext;
John McCallc71a4912010-06-04 19:02:56 +00008810 BlockTy = Context.getFunctionType(RetTy,
8811 FPT->arg_type_begin(),
8812 FPT->getNumArgs(),
John McCalle23cf432010-12-14 08:05:40 +00008813 EPI);
John McCallc71a4912010-06-04 19:02:56 +00008814 }
8815
8816 // If we don't have a function type, just build one from nothing.
8817 } else {
John McCalle23cf432010-12-14 08:05:40 +00008818 FunctionProtoType::ExtProtoInfo EPI;
John McCallf85e1932011-06-15 23:02:42 +00008819 EPI.ExtInfo = FunctionType::ExtInfo().withNoReturn(NoReturn);
John McCalle23cf432010-12-14 08:05:40 +00008820 BlockTy = Context.getFunctionType(RetTy, 0, 0, EPI);
John McCallc71a4912010-06-04 19:02:56 +00008821 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008822
John McCallc71a4912010-06-04 19:02:56 +00008823 DiagnoseUnusedParameters(BSI->TheDecl->param_begin(),
8824 BSI->TheDecl->param_end());
Steve Naroff4eb206b2008-09-03 18:15:37 +00008825 BlockTy = Context.getBlockPointerType(BlockTy);
Mike Stumpeed9cac2009-02-19 03:04:26 +00008826
Chris Lattner17a78302009-04-19 05:28:12 +00008827 // If needed, diagnose invalid gotos and switches in the block.
John McCallf85e1932011-06-15 23:02:42 +00008828 if (getCurFunction()->NeedsScopeChecking() &&
8829 !hasAnyUnrecoverableErrorsInThisFunction())
John McCall9ae2f072010-08-23 23:25:46 +00008830 DiagnoseInvalidJumps(cast<CompoundStmt>(Body));
Mike Stump1eb44332009-09-09 15:08:12 +00008831
Chris Lattnere476bdc2011-02-17 23:58:47 +00008832 BSI->TheDecl->setBody(cast<CompoundStmt>(Body));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008833
Fariborz Jahanian4e7c7f22011-07-11 18:04:54 +00008834 for (BlockDecl::capture_const_iterator ci = BSI->TheDecl->capture_begin(),
8835 ce = BSI->TheDecl->capture_end(); ci != ce; ++ci) {
8836 const VarDecl *variable = ci->getVariable();
8837 QualType T = variable->getType();
8838 QualType::DestructionKind destructKind = T.isDestructedType();
8839 if (destructKind != QualType::DK_none)
8840 getCurFunction()->setHasBranchProtectedScope();
8841 }
8842
Douglas Gregorf8b7f712011-09-06 20:46:03 +00008843 computeNRVO(Body, getCurBlock());
8844
Benjamin Kramerd2486192011-07-12 14:11:05 +00008845 BlockExpr *Result = new (Context) BlockExpr(BSI->TheDecl, BlockTy);
8846 const AnalysisBasedWarnings::Policy &WP = AnalysisWarnings.getDefaultPolicy();
8847 PopFunctionOrBlockScope(&WP, Result->getBlockDecl(), Result);
8848
John McCall80ee6e82011-11-10 05:35:25 +00008849 // If the block isn't obviously global, i.e. it captures anything at
8850 // all, mark this full-expression as needing a cleanup.
8851 if (Result->getBlockDecl()->hasCaptures()) {
8852 ExprCleanupObjects.push_back(Result->getBlockDecl());
8853 ExprNeedsCleanups = true;
8854 }
8855
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008856 return Owned(Result);
Steve Naroff4eb206b2008-09-03 18:15:37 +00008857}
8858
John McCall60d7b3a2010-08-24 06:29:42 +00008859ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00008860 Expr *E, ParsedType Ty,
Sebastian Redlf53597f2009-03-15 17:47:39 +00008861 SourceLocation RPLoc) {
Abramo Bagnara2cad9002010-08-10 10:06:15 +00008862 TypeSourceInfo *TInfo;
Richard Trieuccd891a2011-09-09 01:45:06 +00008863 GetTypeFromParser(Ty, &TInfo);
8864 return BuildVAArgExpr(BuiltinLoc, E, TInfo, RPLoc);
Abramo Bagnara2cad9002010-08-10 10:06:15 +00008865}
8866
John McCall60d7b3a2010-08-24 06:29:42 +00008867ExprResult Sema::BuildVAArgExpr(SourceLocation BuiltinLoc,
John McCallf89e55a2010-11-18 06:31:45 +00008868 Expr *E, TypeSourceInfo *TInfo,
8869 SourceLocation RPLoc) {
Chris Lattner0d20b8a2009-04-05 15:49:53 +00008870 Expr *OrigExpr = E;
Mike Stump1eb44332009-09-09 15:08:12 +00008871
Eli Friedmanc34bcde2008-08-09 23:32:40 +00008872 // Get the va_list type
8873 QualType VaListType = Context.getBuiltinVaListType();
Eli Friedman5c091ba2009-05-16 12:46:54 +00008874 if (VaListType->isArrayType()) {
8875 // Deal with implicit array decay; for example, on x86-64,
8876 // va_list is an array, but it's supposed to decay to
8877 // a pointer for va_arg.
Eli Friedmanc34bcde2008-08-09 23:32:40 +00008878 VaListType = Context.getArrayDecayedType(VaListType);
Eli Friedman5c091ba2009-05-16 12:46:54 +00008879 // Make sure the input expression also decays appropriately.
John Wiegley429bb272011-04-08 18:41:53 +00008880 ExprResult Result = UsualUnaryConversions(E);
8881 if (Result.isInvalid())
8882 return ExprError();
8883 E = Result.take();
Eli Friedman5c091ba2009-05-16 12:46:54 +00008884 } else {
8885 // Otherwise, the va_list argument must be an l-value because
8886 // it is modified by va_arg.
Mike Stump1eb44332009-09-09 15:08:12 +00008887 if (!E->isTypeDependent() &&
Douglas Gregordd027302009-05-19 23:10:31 +00008888 CheckForModifiableLvalue(E, BuiltinLoc, *this))
Eli Friedman5c091ba2009-05-16 12:46:54 +00008889 return ExprError();
8890 }
Eli Friedmanc34bcde2008-08-09 23:32:40 +00008891
Douglas Gregordd027302009-05-19 23:10:31 +00008892 if (!E->isTypeDependent() &&
8893 !Context.hasSameType(VaListType, E->getType())) {
Sebastian Redlf53597f2009-03-15 17:47:39 +00008894 return ExprError(Diag(E->getLocStart(),
8895 diag::err_first_argument_to_va_arg_not_of_type_va_list)
Chris Lattner0d20b8a2009-04-05 15:49:53 +00008896 << OrigExpr->getType() << E->getSourceRange());
Chris Lattner9dc8f192009-04-05 00:59:53 +00008897 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008898
David Majnemer0adde122011-06-14 05:17:32 +00008899 if (!TInfo->getType()->isDependentType()) {
8900 if (RequireCompleteType(TInfo->getTypeLoc().getBeginLoc(), TInfo->getType(),
8901 PDiag(diag::err_second_parameter_to_va_arg_incomplete)
8902 << TInfo->getTypeLoc().getSourceRange()))
8903 return ExprError();
David Majnemerdb11b012011-06-13 06:37:03 +00008904
David Majnemer0adde122011-06-14 05:17:32 +00008905 if (RequireNonAbstractType(TInfo->getTypeLoc().getBeginLoc(),
8906 TInfo->getType(),
8907 PDiag(diag::err_second_parameter_to_va_arg_abstract)
8908 << TInfo->getTypeLoc().getSourceRange()))
8909 return ExprError();
8910
Douglas Gregor4eb75222011-07-30 06:45:27 +00008911 if (!TInfo->getType().isPODType(Context)) {
David Majnemer0adde122011-06-14 05:17:32 +00008912 Diag(TInfo->getTypeLoc().getBeginLoc(),
Douglas Gregor4eb75222011-07-30 06:45:27 +00008913 TInfo->getType()->isObjCLifetimeType()
8914 ? diag::warn_second_parameter_to_va_arg_ownership_qualified
8915 : diag::warn_second_parameter_to_va_arg_not_pod)
David Majnemer0adde122011-06-14 05:17:32 +00008916 << TInfo->getType()
8917 << TInfo->getTypeLoc().getSourceRange();
Douglas Gregor4eb75222011-07-30 06:45:27 +00008918 }
Eli Friedman46d37c12011-07-11 21:45:59 +00008919
8920 // Check for va_arg where arguments of the given type will be promoted
8921 // (i.e. this va_arg is guaranteed to have undefined behavior).
8922 QualType PromoteType;
8923 if (TInfo->getType()->isPromotableIntegerType()) {
8924 PromoteType = Context.getPromotedIntegerType(TInfo->getType());
8925 if (Context.typesAreCompatible(PromoteType, TInfo->getType()))
8926 PromoteType = QualType();
8927 }
8928 if (TInfo->getType()->isSpecificBuiltinType(BuiltinType::Float))
8929 PromoteType = Context.DoubleTy;
8930 if (!PromoteType.isNull())
8931 Diag(TInfo->getTypeLoc().getBeginLoc(),
8932 diag::warn_second_parameter_to_va_arg_never_compatible)
8933 << TInfo->getType()
8934 << PromoteType
8935 << TInfo->getTypeLoc().getSourceRange();
David Majnemer0adde122011-06-14 05:17:32 +00008936 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008937
Abramo Bagnara2cad9002010-08-10 10:06:15 +00008938 QualType T = TInfo->getType().getNonLValueExprType(Context);
8939 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, TInfo, RPLoc, T));
Anders Carlsson7c50aca2007-10-15 20:28:48 +00008940}
8941
John McCall60d7b3a2010-08-24 06:29:42 +00008942ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) {
Douglas Gregor2d8b2732008-11-29 04:51:27 +00008943 // The type of __null will be int or long, depending on the size of
8944 // pointers on the target.
8945 QualType Ty;
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00008946 unsigned pw = Context.getTargetInfo().getPointerWidth(0);
8947 if (pw == Context.getTargetInfo().getIntWidth())
Douglas Gregor2d8b2732008-11-29 04:51:27 +00008948 Ty = Context.IntTy;
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00008949 else if (pw == Context.getTargetInfo().getLongWidth())
Douglas Gregor2d8b2732008-11-29 04:51:27 +00008950 Ty = Context.LongTy;
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00008951 else if (pw == Context.getTargetInfo().getLongLongWidth())
NAKAMURA Takumi6e5658d2011-01-19 00:11:41 +00008952 Ty = Context.LongLongTy;
8953 else {
David Blaikieb219cfc2011-09-23 05:06:16 +00008954 llvm_unreachable("I don't know size of pointer!");
NAKAMURA Takumi6e5658d2011-01-19 00:11:41 +00008955 }
Douglas Gregor2d8b2732008-11-29 04:51:27 +00008956
Sebastian Redlf53597f2009-03-15 17:47:39 +00008957 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc));
Douglas Gregor2d8b2732008-11-29 04:51:27 +00008958}
8959
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00008960static void MakeObjCStringLiteralFixItHint(Sema& SemaRef, QualType DstType,
Douglas Gregor849b2432010-03-31 17:46:05 +00008961 Expr *SrcExpr, FixItHint &Hint) {
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00008962 if (!SemaRef.getLangOptions().ObjC1)
8963 return;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008964
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00008965 const ObjCObjectPointerType *PT = DstType->getAs<ObjCObjectPointerType>();
8966 if (!PT)
8967 return;
8968
8969 // Check if the destination is of type 'id'.
8970 if (!PT->isObjCIdType()) {
8971 // Check if the destination is the 'NSString' interface.
8972 const ObjCInterfaceDecl *ID = PT->getInterfaceDecl();
8973 if (!ID || !ID->getIdentifier()->isStr("NSString"))
8974 return;
8975 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008976
John McCall4b9c2d22011-11-06 09:01:30 +00008977 // Ignore any parens, implicit casts (should only be
8978 // array-to-pointer decays), and not-so-opaque values. The last is
8979 // important for making this trigger for property assignments.
8980 SrcExpr = SrcExpr->IgnoreParenImpCasts();
8981 if (OpaqueValueExpr *OV = dyn_cast<OpaqueValueExpr>(SrcExpr))
8982 if (OV->getSourceExpr())
8983 SrcExpr = OV->getSourceExpr()->IgnoreParenImpCasts();
8984
8985 StringLiteral *SL = dyn_cast<StringLiteral>(SrcExpr);
Douglas Gregor5cee1192011-07-27 05:40:30 +00008986 if (!SL || !SL->isAscii())
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00008987 return;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008988
Douglas Gregor849b2432010-03-31 17:46:05 +00008989 Hint = FixItHint::CreateInsertion(SL->getLocStart(), "@");
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00008990}
8991
Chris Lattner5cf216b2008-01-04 18:04:52 +00008992bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy,
8993 SourceLocation Loc,
8994 QualType DstType, QualType SrcType,
Douglas Gregora41a8c52010-04-22 00:20:18 +00008995 Expr *SrcExpr, AssignmentAction Action,
8996 bool *Complained) {
8997 if (Complained)
8998 *Complained = false;
8999
Chris Lattner5cf216b2008-01-04 18:04:52 +00009000 // Decode the result (notice that AST's are still created for extensions).
Douglas Gregor926df6c2011-06-11 01:09:30 +00009001 bool CheckInferredResultType = false;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009002 bool isInvalid = false;
9003 unsigned DiagKind;
Douglas Gregor849b2432010-03-31 17:46:05 +00009004 FixItHint Hint;
Anna Zaks67221552011-07-28 19:51:27 +00009005 ConversionFixItGenerator ConvHints;
9006 bool MayHaveConvFixit = false;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009007
Chris Lattner5cf216b2008-01-04 18:04:52 +00009008 switch (ConvTy) {
David Blaikieb219cfc2011-09-23 05:06:16 +00009009 default: llvm_unreachable("Unknown conversion type");
Chris Lattner5cf216b2008-01-04 18:04:52 +00009010 case Compatible: return false;
Chris Lattnerb7b61152008-01-04 18:22:42 +00009011 case PointerToInt:
Chris Lattner5cf216b2008-01-04 18:04:52 +00009012 DiagKind = diag::ext_typecheck_convert_pointer_int;
Anna Zaks67221552011-07-28 19:51:27 +00009013 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
9014 MayHaveConvFixit = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009015 break;
Chris Lattnerb7b61152008-01-04 18:22:42 +00009016 case IntToPointer:
9017 DiagKind = diag::ext_typecheck_convert_int_pointer;
Anna Zaks67221552011-07-28 19:51:27 +00009018 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
9019 MayHaveConvFixit = true;
Chris Lattnerb7b61152008-01-04 18:22:42 +00009020 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009021 case IncompatiblePointer:
Douglas Gregor849b2432010-03-31 17:46:05 +00009022 MakeObjCStringLiteralFixItHint(*this, DstType, SrcExpr, Hint);
Chris Lattner5cf216b2008-01-04 18:04:52 +00009023 DiagKind = diag::ext_typecheck_convert_incompatible_pointer;
Douglas Gregor926df6c2011-06-11 01:09:30 +00009024 CheckInferredResultType = DstType->isObjCObjectPointerType() &&
9025 SrcType->isObjCObjectPointerType();
Anna Zaks67221552011-07-28 19:51:27 +00009026 if (Hint.isNull() && !CheckInferredResultType) {
9027 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
9028 }
9029 MayHaveConvFixit = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009030 break;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00009031 case IncompatiblePointerSign:
9032 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign;
9033 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009034 case FunctionVoidPointer:
9035 DiagKind = diag::ext_typecheck_convert_pointer_void_func;
9036 break;
John McCall86c05f32011-02-01 00:10:29 +00009037 case IncompatiblePointerDiscardsQualifiers: {
John McCall40249e72011-02-01 23:28:01 +00009038 // Perform array-to-pointer decay if necessary.
9039 if (SrcType->isArrayType()) SrcType = Context.getArrayDecayedType(SrcType);
9040
John McCall86c05f32011-02-01 00:10:29 +00009041 Qualifiers lhq = SrcType->getPointeeType().getQualifiers();
9042 Qualifiers rhq = DstType->getPointeeType().getQualifiers();
9043 if (lhq.getAddressSpace() != rhq.getAddressSpace()) {
9044 DiagKind = diag::err_typecheck_incompatible_address_space;
9045 break;
John McCallf85e1932011-06-15 23:02:42 +00009046
9047
9048 } else if (lhq.getObjCLifetime() != rhq.getObjCLifetime()) {
Argyrios Kyrtzidisb8b03132011-06-24 00:08:59 +00009049 DiagKind = diag::err_typecheck_incompatible_ownership;
John McCallf85e1932011-06-15 23:02:42 +00009050 break;
John McCall86c05f32011-02-01 00:10:29 +00009051 }
9052
9053 llvm_unreachable("unknown error case for discarding qualifiers!");
9054 // fallthrough
9055 }
Chris Lattner5cf216b2008-01-04 18:04:52 +00009056 case CompatiblePointerDiscardsQualifiers:
Douglas Gregor77a52232008-09-12 00:47:35 +00009057 // If the qualifiers lost were because we were applying the
9058 // (deprecated) C++ conversion from a string literal to a char*
9059 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME:
9060 // Ideally, this check would be performed in
John McCalle4be87e2011-01-31 23:13:11 +00009061 // checkPointerTypesForAssignment. However, that would require a
Douglas Gregor77a52232008-09-12 00:47:35 +00009062 // bit of refactoring (so that the second argument is an
9063 // expression, rather than a type), which should be done as part
John McCalle4be87e2011-01-31 23:13:11 +00009064 // of a larger effort to fix checkPointerTypesForAssignment for
Douglas Gregor77a52232008-09-12 00:47:35 +00009065 // C++ semantics.
9066 if (getLangOptions().CPlusPlus &&
9067 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType))
9068 return false;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009069 DiagKind = diag::ext_typecheck_convert_discards_qualifiers;
9070 break;
Sean Huntc9132b62009-11-08 07:46:34 +00009071 case IncompatibleNestedPointerQualifiers:
Fariborz Jahanian3451e922009-11-09 22:16:37 +00009072 DiagKind = diag::ext_nested_pointer_qualifier_mismatch;
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00009073 break;
Steve Naroff1c7d0672008-09-04 15:10:53 +00009074 case IntToBlockPointer:
9075 DiagKind = diag::err_int_to_block_pointer;
9076 break;
9077 case IncompatibleBlockPointer:
Mike Stump25efa102009-04-21 22:51:42 +00009078 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer;
Steve Naroff1c7d0672008-09-04 15:10:53 +00009079 break;
Steve Naroff39579072008-10-14 22:18:38 +00009080 case IncompatibleObjCQualifiedId:
Mike Stumpeed9cac2009-02-19 03:04:26 +00009081 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since
Steve Naroff39579072008-10-14 22:18:38 +00009082 // it can give a more specific diagnostic.
9083 DiagKind = diag::warn_incompatible_qualified_id;
9084 break;
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00009085 case IncompatibleVectors:
9086 DiagKind = diag::warn_incompatible_vectors;
9087 break;
Fariborz Jahanian04e5a252011-07-07 18:55:47 +00009088 case IncompatibleObjCWeakRef:
9089 DiagKind = diag::err_arc_weak_unavailable_assign;
9090 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009091 case Incompatible:
9092 DiagKind = diag::err_typecheck_convert_incompatible;
Anna Zaks67221552011-07-28 19:51:27 +00009093 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
9094 MayHaveConvFixit = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009095 isInvalid = true;
9096 break;
9097 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00009098
Douglas Gregord4eea832010-04-09 00:35:39 +00009099 QualType FirstType, SecondType;
9100 switch (Action) {
9101 case AA_Assigning:
9102 case AA_Initializing:
9103 // The destination type comes first.
9104 FirstType = DstType;
9105 SecondType = SrcType;
9106 break;
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00009107
Douglas Gregord4eea832010-04-09 00:35:39 +00009108 case AA_Returning:
9109 case AA_Passing:
9110 case AA_Converting:
9111 case AA_Sending:
9112 case AA_Casting:
9113 // The source type comes first.
9114 FirstType = SrcType;
9115 SecondType = DstType;
9116 break;
9117 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00009118
Anna Zaks67221552011-07-28 19:51:27 +00009119 PartialDiagnostic FDiag = PDiag(DiagKind);
9120 FDiag << FirstType << SecondType << Action << SrcExpr->getSourceRange();
9121
9122 // If we can fix the conversion, suggest the FixIts.
9123 assert(ConvHints.isNull() || Hint.isNull());
9124 if (!ConvHints.isNull()) {
9125 for (llvm::SmallVector<FixItHint, 1>::iterator
9126 HI = ConvHints.Hints.begin(), HE = ConvHints.Hints.end();
9127 HI != HE; ++HI)
9128 FDiag << *HI;
9129 } else {
9130 FDiag << Hint;
9131 }
9132 if (MayHaveConvFixit) { FDiag << (unsigned) (ConvHints.Kind); }
9133
9134 Diag(Loc, FDiag);
9135
Douglas Gregor926df6c2011-06-11 01:09:30 +00009136 if (CheckInferredResultType)
9137 EmitRelatedResultTypeNote(SrcExpr);
9138
Douglas Gregora41a8c52010-04-22 00:20:18 +00009139 if (Complained)
9140 *Complained = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009141 return isInvalid;
9142}
Anders Carlssone21555e2008-11-30 19:50:32 +00009143
Chris Lattner3bf68932009-04-25 21:59:05 +00009144bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){
Eli Friedman3b5ccca2009-04-25 22:26:58 +00009145 llvm::APSInt ICEResult;
9146 if (E->isIntegerConstantExpr(ICEResult, Context)) {
9147 if (Result)
9148 *Result = ICEResult;
9149 return false;
9150 }
9151
Anders Carlssone21555e2008-11-30 19:50:32 +00009152 Expr::EvalResult EvalResult;
9153
Richard Smith51f47082011-10-29 00:50:52 +00009154 if (!E->EvaluateAsRValue(EvalResult, Context) || !EvalResult.Val.isInt() ||
Anders Carlssone21555e2008-11-30 19:50:32 +00009155 EvalResult.HasSideEffects) {
9156 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange();
9157
9158 if (EvalResult.Diag) {
9159 // We only show the note if it's not the usual "invalid subexpression"
9160 // or if it's actually in a subexpression.
9161 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice ||
9162 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens())
9163 Diag(EvalResult.DiagLoc, EvalResult.Diag);
9164 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00009165
Anders Carlssone21555e2008-11-30 19:50:32 +00009166 return true;
9167 }
9168
Eli Friedman3b5ccca2009-04-25 22:26:58 +00009169 Diag(E->getExprLoc(), diag::ext_expr_not_ice) <<
9170 E->getSourceRange();
Anders Carlssone21555e2008-11-30 19:50:32 +00009171
Eli Friedman3b5ccca2009-04-25 22:26:58 +00009172 if (EvalResult.Diag &&
Argyrios Kyrtzidis08274082010-12-15 18:44:22 +00009173 Diags.getDiagnosticLevel(diag::ext_expr_not_ice, EvalResult.DiagLoc)
David Blaikied6471f72011-09-25 23:23:43 +00009174 != DiagnosticsEngine::Ignored)
Eli Friedman3b5ccca2009-04-25 22:26:58 +00009175 Diag(EvalResult.DiagLoc, EvalResult.Diag);
Mike Stumpeed9cac2009-02-19 03:04:26 +00009176
Anders Carlssone21555e2008-11-30 19:50:32 +00009177 if (Result)
9178 *Result = EvalResult.Val.getInt();
9179 return false;
9180}
Douglas Gregore0762c92009-06-19 23:52:42 +00009181
Douglas Gregor2afce722009-11-26 00:44:06 +00009182void
Mike Stump1eb44332009-09-09 15:08:12 +00009183Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) {
Douglas Gregor2afce722009-11-26 00:44:06 +00009184 ExprEvalContexts.push_back(
John McCallf85e1932011-06-15 23:02:42 +00009185 ExpressionEvaluationContextRecord(NewContext,
John McCall80ee6e82011-11-10 05:35:25 +00009186 ExprCleanupObjects.size(),
John McCallf85e1932011-06-15 23:02:42 +00009187 ExprNeedsCleanups));
9188 ExprNeedsCleanups = false;
Douglas Gregorac7610d2009-06-22 20:57:11 +00009189}
9190
Richard Trieu67e29332011-08-02 04:35:43 +00009191void Sema::PopExpressionEvaluationContext() {
Douglas Gregor2afce722009-11-26 00:44:06 +00009192 // Pop the current expression evaluation context off the stack.
9193 ExpressionEvaluationContextRecord Rec = ExprEvalContexts.back();
9194 ExprEvalContexts.pop_back();
Douglas Gregorac7610d2009-06-22 20:57:11 +00009195
Douglas Gregor06d33692009-12-12 07:57:52 +00009196 if (Rec.Context == PotentiallyPotentiallyEvaluated) {
9197 if (Rec.PotentiallyReferenced) {
9198 // Mark any remaining declarations in the current position of the stack
9199 // as "referenced". If they were not meant to be referenced, semantic
9200 // analysis would have eliminated them (e.g., in ActOnCXXTypeId).
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009201 for (PotentiallyReferencedDecls::iterator
Douglas Gregor06d33692009-12-12 07:57:52 +00009202 I = Rec.PotentiallyReferenced->begin(),
9203 IEnd = Rec.PotentiallyReferenced->end();
9204 I != IEnd; ++I)
9205 MarkDeclarationReferenced(I->first, I->second);
9206 }
9207
9208 if (Rec.PotentiallyDiagnosed) {
9209 // Emit any pending diagnostics.
9210 for (PotentiallyEmittedDiagnostics::iterator
9211 I = Rec.PotentiallyDiagnosed->begin(),
9212 IEnd = Rec.PotentiallyDiagnosed->end();
9213 I != IEnd; ++I)
9214 Diag(I->first, I->second);
9215 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009216 }
Douglas Gregor2afce722009-11-26 00:44:06 +00009217
9218 // When are coming out of an unevaluated context, clear out any
9219 // temporaries that we may have created as part of the evaluation of
9220 // the expression in that context: they aren't relevant because they
9221 // will never be constructed.
John McCallf85e1932011-06-15 23:02:42 +00009222 if (Rec.Context == Unevaluated) {
John McCall80ee6e82011-11-10 05:35:25 +00009223 ExprCleanupObjects.erase(ExprCleanupObjects.begin() + Rec.NumCleanupObjects,
9224 ExprCleanupObjects.end());
John McCallf85e1932011-06-15 23:02:42 +00009225 ExprNeedsCleanups = Rec.ParentNeedsCleanups;
9226
9227 // Otherwise, merge the contexts together.
9228 } else {
9229 ExprNeedsCleanups |= Rec.ParentNeedsCleanups;
9230 }
Douglas Gregor2afce722009-11-26 00:44:06 +00009231
9232 // Destroy the popped expression evaluation record.
9233 Rec.Destroy();
Douglas Gregorac7610d2009-06-22 20:57:11 +00009234}
Douglas Gregore0762c92009-06-19 23:52:42 +00009235
John McCallf85e1932011-06-15 23:02:42 +00009236void Sema::DiscardCleanupsInEvaluationContext() {
John McCall80ee6e82011-11-10 05:35:25 +00009237 ExprCleanupObjects.erase(
9238 ExprCleanupObjects.begin() + ExprEvalContexts.back().NumCleanupObjects,
9239 ExprCleanupObjects.end());
John McCallf85e1932011-06-15 23:02:42 +00009240 ExprNeedsCleanups = false;
9241}
9242
Douglas Gregore0762c92009-06-19 23:52:42 +00009243/// \brief Note that the given declaration was referenced in the source code.
9244///
9245/// This routine should be invoke whenever a given declaration is referenced
9246/// in the source code, and where that reference occurred. If this declaration
9247/// reference means that the the declaration is used (C++ [basic.def.odr]p2,
9248/// C99 6.9p3), then the declaration will be marked as used.
9249///
9250/// \param Loc the location where the declaration was referenced.
9251///
9252/// \param D the declaration that has been referenced by the source code.
9253void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) {
9254 assert(D && "No declaration?");
Mike Stump1eb44332009-09-09 15:08:12 +00009255
Argyrios Kyrtzidis6b6b42a2011-04-19 19:51:10 +00009256 D->setReferenced();
9257
Douglas Gregorc070cc62010-06-17 23:14:26 +00009258 if (D->isUsed(false))
Douglas Gregord7f37bf2009-06-22 23:06:13 +00009259 return;
Mike Stump1eb44332009-09-09 15:08:12 +00009260
Richard Trieu67e29332011-08-02 04:35:43 +00009261 // Mark a parameter or variable declaration "used", regardless of whether
9262 // we're in a template or not. The reason for this is that unevaluated
9263 // expressions (e.g. (void)sizeof()) constitute a use for warning purposes
9264 // (-Wunused-variables and -Wunused-parameters)
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009265 if (isa<ParmVarDecl>(D) ||
Douglas Gregorfc2ca562010-04-07 20:29:57 +00009266 (isa<VarDecl>(D) && D->getDeclContext()->isFunctionOrMethod())) {
Anders Carlsson2127ecc2010-10-22 23:37:08 +00009267 D->setUsed();
Douglas Gregorfc2ca562010-04-07 20:29:57 +00009268 return;
9269 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00009270
Douglas Gregorfc2ca562010-04-07 20:29:57 +00009271 if (!isa<VarDecl>(D) && !isa<FunctionDecl>(D))
9272 return;
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00009273
Douglas Gregore0762c92009-06-19 23:52:42 +00009274 // Do not mark anything as "used" within a dependent context; wait for
9275 // an instantiation.
9276 if (CurContext->isDependentContext())
9277 return;
Mike Stump1eb44332009-09-09 15:08:12 +00009278
Douglas Gregor2afce722009-11-26 00:44:06 +00009279 switch (ExprEvalContexts.back().Context) {
Douglas Gregorac7610d2009-06-22 20:57:11 +00009280 case Unevaluated:
9281 // We are in an expression that is not potentially evaluated; do nothing.
9282 return;
Mike Stump1eb44332009-09-09 15:08:12 +00009283
Douglas Gregorac7610d2009-06-22 20:57:11 +00009284 case PotentiallyEvaluated:
9285 // We are in a potentially-evaluated expression, so this declaration is
9286 // "used"; handle this below.
9287 break;
Mike Stump1eb44332009-09-09 15:08:12 +00009288
Douglas Gregorac7610d2009-06-22 20:57:11 +00009289 case PotentiallyPotentiallyEvaluated:
9290 // We are in an expression that may be potentially evaluated; queue this
9291 // declaration reference until we know whether the expression is
9292 // potentially evaluated.
Douglas Gregor2afce722009-11-26 00:44:06 +00009293 ExprEvalContexts.back().addReferencedDecl(Loc, D);
Douglas Gregorac7610d2009-06-22 20:57:11 +00009294 return;
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009295
9296 case PotentiallyEvaluatedIfUsed:
9297 // Referenced declarations will only be used if the construct in the
9298 // containing expression is used.
9299 return;
Douglas Gregorac7610d2009-06-22 20:57:11 +00009300 }
Mike Stump1eb44332009-09-09 15:08:12 +00009301
Douglas Gregore0762c92009-06-19 23:52:42 +00009302 // Note that this declaration has been used.
Fariborz Jahanianb7f4cc02009-06-22 17:30:33 +00009303 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) {
Sebastian Redl85ea7aa2011-08-30 19:58:05 +00009304 if (Constructor->isDefaulted()) {
9305 if (Constructor->isDefaultConstructor()) {
9306 if (Constructor->isTrivial())
9307 return;
9308 if (!Constructor->isUsed(false))
9309 DefineImplicitDefaultConstructor(Loc, Constructor);
9310 } else if (Constructor->isCopyConstructor()) {
9311 if (!Constructor->isUsed(false))
9312 DefineImplicitCopyConstructor(Loc, Constructor);
9313 } else if (Constructor->isMoveConstructor()) {
9314 if (!Constructor->isUsed(false))
9315 DefineImplicitMoveConstructor(Loc, Constructor);
9316 }
Fariborz Jahanian485f0872009-06-22 23:34:40 +00009317 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009318
Douglas Gregor6fb745b2010-05-13 16:44:06 +00009319 MarkVTableUsed(Loc, Constructor->getParent());
Fariborz Jahanian8d2b3562009-06-26 23:49:16 +00009320 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) {
Sean Huntcb45a0f2011-05-12 22:46:25 +00009321 if (Destructor->isDefaulted() && !Destructor->isUsed(false))
Fariborz Jahanian8d2b3562009-06-26 23:49:16 +00009322 DefineImplicitDestructor(Loc, Destructor);
Douglas Gregor6fb745b2010-05-13 16:44:06 +00009323 if (Destructor->isVirtual())
9324 MarkVTableUsed(Loc, Destructor->getParent());
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +00009325 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) {
Sean Hunt2b188082011-05-14 05:23:28 +00009326 if (MethodDecl->isDefaulted() && MethodDecl->isOverloadedOperator() &&
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +00009327 MethodDecl->getOverloadedOperator() == OO_Equal) {
Sebastian Redl85ea7aa2011-08-30 19:58:05 +00009328 if (!MethodDecl->isUsed(false)) {
9329 if (MethodDecl->isCopyAssignmentOperator())
9330 DefineImplicitCopyAssignment(Loc, MethodDecl);
9331 else
9332 DefineImplicitMoveAssignment(Loc, MethodDecl);
9333 }
Douglas Gregor6fb745b2010-05-13 16:44:06 +00009334 } else if (MethodDecl->isVirtual())
9335 MarkVTableUsed(Loc, MethodDecl->getParent());
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +00009336 }
Fariborz Jahanianf5ed9e02009-06-24 22:09:44 +00009337 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
John McCall15e310a2011-02-19 02:53:41 +00009338 // Recursive functions should be marked when used from another function.
9339 if (CurContext == Function) return;
9340
Mike Stump1eb44332009-09-09 15:08:12 +00009341 // Implicit instantiation of function templates and member functions of
Douglas Gregor1637be72009-06-26 00:10:03 +00009342 // class templates.
Douglas Gregor6cfacfe2010-05-17 17:34:56 +00009343 if (Function->isImplicitlyInstantiable()) {
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009344 bool AlreadyInstantiated = false;
9345 if (FunctionTemplateSpecializationInfo *SpecInfo
9346 = Function->getTemplateSpecializationInfo()) {
9347 if (SpecInfo->getPointOfInstantiation().isInvalid())
9348 SpecInfo->setPointOfInstantiation(Loc);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009349 else if (SpecInfo->getTemplateSpecializationKind()
Douglas Gregor3b846b62009-10-27 20:53:28 +00009350 == TSK_ImplicitInstantiation)
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009351 AlreadyInstantiated = true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009352 } else if (MemberSpecializationInfo *MSInfo
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009353 = Function->getMemberSpecializationInfo()) {
9354 if (MSInfo->getPointOfInstantiation().isInvalid())
9355 MSInfo->setPointOfInstantiation(Loc);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009356 else if (MSInfo->getTemplateSpecializationKind()
Douglas Gregor3b846b62009-10-27 20:53:28 +00009357 == TSK_ImplicitInstantiation)
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009358 AlreadyInstantiated = true;
9359 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009360
Douglas Gregor60406be2010-01-16 22:29:39 +00009361 if (!AlreadyInstantiated) {
9362 if (isa<CXXRecordDecl>(Function->getDeclContext()) &&
9363 cast<CXXRecordDecl>(Function->getDeclContext())->isLocalClass())
9364 PendingLocalImplicitInstantiations.push_back(std::make_pair(Function,
9365 Loc));
9366 else
Chandler Carruth62c78d52010-08-25 08:44:16 +00009367 PendingInstantiations.push_back(std::make_pair(Function, Loc));
Douglas Gregor60406be2010-01-16 22:29:39 +00009368 }
John McCall15e310a2011-02-19 02:53:41 +00009369 } else {
9370 // Walk redefinitions, as some of them may be instantiable.
Gabor Greif40181c42010-08-28 00:16:06 +00009371 for (FunctionDecl::redecl_iterator i(Function->redecls_begin()),
9372 e(Function->redecls_end()); i != e; ++i) {
Gabor Greifbe9ebe32010-08-28 01:58:12 +00009373 if (!i->isUsed(false) && i->isImplicitlyInstantiable())
Gabor Greif40181c42010-08-28 00:16:06 +00009374 MarkDeclarationReferenced(Loc, *i);
9375 }
John McCall15e310a2011-02-19 02:53:41 +00009376 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009377
John McCall15e310a2011-02-19 02:53:41 +00009378 // Keep track of used but undefined functions.
9379 if (!Function->isPure() && !Function->hasBody() &&
9380 Function->getLinkage() != ExternalLinkage) {
9381 SourceLocation &old = UndefinedInternals[Function->getCanonicalDecl()];
9382 if (old.isInvalid()) old = Loc;
9383 }
Argyrios Kyrtzidis58b52592010-08-25 10:34:54 +00009384
John McCall15e310a2011-02-19 02:53:41 +00009385 Function->setUsed(true);
Douglas Gregore0762c92009-06-19 23:52:42 +00009386 return;
Douglas Gregord7f37bf2009-06-22 23:06:13 +00009387 }
Mike Stump1eb44332009-09-09 15:08:12 +00009388
Douglas Gregore0762c92009-06-19 23:52:42 +00009389 if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
Douglas Gregor7caa6822009-07-24 20:34:43 +00009390 // Implicit instantiation of static data members of class templates.
Mike Stump1eb44332009-09-09 15:08:12 +00009391 if (Var->isStaticDataMember() &&
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009392 Var->getInstantiatedFromStaticDataMember()) {
9393 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo();
9394 assert(MSInfo && "Missing member specialization information?");
9395 if (MSInfo->getPointOfInstantiation().isInvalid() &&
9396 MSInfo->getTemplateSpecializationKind()== TSK_ImplicitInstantiation) {
9397 MSInfo->setPointOfInstantiation(Loc);
Sebastian Redlf79a7192011-04-29 08:19:30 +00009398 // This is a modification of an existing AST node. Notify listeners.
9399 if (ASTMutationListener *L = getASTMutationListener())
9400 L->StaticDataMemberInstantiated(Var);
Chandler Carruth62c78d52010-08-25 08:44:16 +00009401 PendingInstantiations.push_back(std::make_pair(Var, Loc));
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009402 }
9403 }
Mike Stump1eb44332009-09-09 15:08:12 +00009404
John McCall77efc682011-02-21 19:25:48 +00009405 // Keep track of used but undefined variables. We make a hole in
9406 // the warning for static const data members with in-line
9407 // initializers.
John McCall15e310a2011-02-19 02:53:41 +00009408 if (Var->hasDefinition() == VarDecl::DeclarationOnly
John McCall77efc682011-02-21 19:25:48 +00009409 && Var->getLinkage() != ExternalLinkage
9410 && !(Var->isStaticDataMember() && Var->hasInit())) {
John McCall15e310a2011-02-19 02:53:41 +00009411 SourceLocation &old = UndefinedInternals[Var->getCanonicalDecl()];
9412 if (old.isInvalid()) old = Loc;
9413 }
Douglas Gregor7caa6822009-07-24 20:34:43 +00009414
Douglas Gregore0762c92009-06-19 23:52:42 +00009415 D->setUsed(true);
Douglas Gregor7caa6822009-07-24 20:34:43 +00009416 return;
Sam Weinigcce6ebc2009-09-11 03:29:30 +00009417 }
Douglas Gregore0762c92009-06-19 23:52:42 +00009418}
Anders Carlsson8c8d9192009-10-09 23:51:55 +00009419
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009420namespace {
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009421 // Mark all of the declarations referenced
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009422 // FIXME: Not fully implemented yet! We need to have a better understanding
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009423 // of when we're entering
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009424 class MarkReferencedDecls : public RecursiveASTVisitor<MarkReferencedDecls> {
9425 Sema &S;
9426 SourceLocation Loc;
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009427
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009428 public:
9429 typedef RecursiveASTVisitor<MarkReferencedDecls> Inherited;
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009430
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009431 MarkReferencedDecls(Sema &S, SourceLocation Loc) : S(S), Loc(Loc) { }
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009432
9433 bool TraverseTemplateArgument(const TemplateArgument &Arg);
9434 bool TraverseRecordType(RecordType *T);
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009435 };
9436}
9437
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009438bool MarkReferencedDecls::TraverseTemplateArgument(
9439 const TemplateArgument &Arg) {
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009440 if (Arg.getKind() == TemplateArgument::Declaration) {
9441 S.MarkDeclarationReferenced(Loc, Arg.getAsDecl());
9442 }
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009443
9444 return Inherited::TraverseTemplateArgument(Arg);
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009445}
9446
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009447bool MarkReferencedDecls::TraverseRecordType(RecordType *T) {
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009448 if (ClassTemplateSpecializationDecl *Spec
9449 = dyn_cast<ClassTemplateSpecializationDecl>(T->getDecl())) {
9450 const TemplateArgumentList &Args = Spec->getTemplateArgs();
Douglas Gregor910f8002010-11-07 23:05:16 +00009451 return TraverseTemplateArguments(Args.data(), Args.size());
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009452 }
9453
Chandler Carruthe3e210c2010-06-10 10:31:57 +00009454 return true;
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009455}
9456
9457void Sema::MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T) {
9458 MarkReferencedDecls Marker(*this, Loc);
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009459 Marker.TraverseType(Context.getCanonicalType(T));
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009460}
9461
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009462namespace {
9463 /// \brief Helper class that marks all of the declarations referenced by
9464 /// potentially-evaluated subexpressions as "referenced".
9465 class EvaluatedExprMarker : public EvaluatedExprVisitor<EvaluatedExprMarker> {
9466 Sema &S;
9467
9468 public:
9469 typedef EvaluatedExprVisitor<EvaluatedExprMarker> Inherited;
9470
9471 explicit EvaluatedExprMarker(Sema &S) : Inherited(S.Context), S(S) { }
9472
9473 void VisitDeclRefExpr(DeclRefExpr *E) {
9474 S.MarkDeclarationReferenced(E->getLocation(), E->getDecl());
9475 }
9476
9477 void VisitMemberExpr(MemberExpr *E) {
9478 S.MarkDeclarationReferenced(E->getMemberLoc(), E->getMemberDecl());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00009479 Inherited::VisitMemberExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009480 }
9481
John McCall80ee6e82011-11-10 05:35:25 +00009482 void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
9483 S.MarkDeclarationReferenced(E->getLocStart(),
9484 const_cast<CXXDestructorDecl*>(E->getTemporary()->getDestructor()));
9485 Visit(E->getSubExpr());
9486 }
9487
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009488 void VisitCXXNewExpr(CXXNewExpr *E) {
9489 if (E->getConstructor())
9490 S.MarkDeclarationReferenced(E->getLocStart(), E->getConstructor());
9491 if (E->getOperatorNew())
9492 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorNew());
9493 if (E->getOperatorDelete())
9494 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorDelete());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00009495 Inherited::VisitCXXNewExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009496 }
9497
9498 void VisitCXXDeleteExpr(CXXDeleteExpr *E) {
9499 if (E->getOperatorDelete())
9500 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorDelete());
Douglas Gregor5833b0b2010-09-14 22:55:20 +00009501 QualType Destroyed = S.Context.getBaseElementType(E->getDestroyedType());
9502 if (const RecordType *DestroyedRec = Destroyed->getAs<RecordType>()) {
9503 CXXRecordDecl *Record = cast<CXXRecordDecl>(DestroyedRec->getDecl());
9504 S.MarkDeclarationReferenced(E->getLocStart(),
9505 S.LookupDestructor(Record));
9506 }
9507
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00009508 Inherited::VisitCXXDeleteExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009509 }
9510
9511 void VisitCXXConstructExpr(CXXConstructExpr *E) {
9512 S.MarkDeclarationReferenced(E->getLocStart(), E->getConstructor());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00009513 Inherited::VisitCXXConstructExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009514 }
9515
9516 void VisitBlockDeclRefExpr(BlockDeclRefExpr *E) {
9517 S.MarkDeclarationReferenced(E->getLocation(), E->getDecl());
9518 }
Douglas Gregor102ff972010-10-19 17:17:35 +00009519
9520 void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
9521 Visit(E->getExpr());
9522 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009523 };
9524}
9525
9526/// \brief Mark any declarations that appear within this expression or any
9527/// potentially-evaluated subexpressions as "referenced".
9528void Sema::MarkDeclarationsReferencedInExpr(Expr *E) {
9529 EvaluatedExprMarker(*this).Visit(E);
9530}
9531
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009532/// \brief Emit a diagnostic that describes an effect on the run-time behavior
9533/// of the program being compiled.
9534///
9535/// This routine emits the given diagnostic when the code currently being
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009536/// type-checked is "potentially evaluated", meaning that there is a
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009537/// possibility that the code will actually be executable. Code in sizeof()
9538/// expressions, code used only during overload resolution, etc., are not
9539/// potentially evaluated. This routine will suppress such diagnostics or,
9540/// in the absolutely nutty case of potentially potentially evaluated
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009541/// expressions (C++ typeid), queue the diagnostic to potentially emit it
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009542/// later.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009543///
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009544/// This routine should be used for all diagnostics that describe the run-time
9545/// behavior of a program, such as passing a non-POD value through an ellipsis.
9546/// Failure to do so will likely result in spurious diagnostics or failures
9547/// during overload resolution or within sizeof/alignof/typeof/typeid.
Richard Trieuccd891a2011-09-09 01:45:06 +00009548bool Sema::DiagRuntimeBehavior(SourceLocation Loc, const Stmt *Statement,
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009549 const PartialDiagnostic &PD) {
John McCallf85e1932011-06-15 23:02:42 +00009550 switch (ExprEvalContexts.back().Context) {
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009551 case Unevaluated:
9552 // The argument will never be evaluated, so don't complain.
9553 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009554
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009555 case PotentiallyEvaluated:
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009556 case PotentiallyEvaluatedIfUsed:
Richard Trieuccd891a2011-09-09 01:45:06 +00009557 if (Statement && getCurFunctionOrMethodDecl()) {
Ted Kremenek351ba912011-02-23 01:52:04 +00009558 FunctionScopes.back()->PossiblyUnreachableDiags.
Richard Trieuccd891a2011-09-09 01:45:06 +00009559 push_back(sema::PossiblyUnreachableDiag(PD, Loc, Statement));
Ted Kremenek351ba912011-02-23 01:52:04 +00009560 }
9561 else
9562 Diag(Loc, PD);
9563
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009564 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009565
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009566 case PotentiallyPotentiallyEvaluated:
9567 ExprEvalContexts.back().addDiagnostic(Loc, PD);
9568 break;
9569 }
9570
9571 return false;
9572}
9573
Anders Carlsson8c8d9192009-10-09 23:51:55 +00009574bool Sema::CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
9575 CallExpr *CE, FunctionDecl *FD) {
9576 if (ReturnType->isVoidType() || !ReturnType->isIncompleteType())
9577 return false;
9578
9579 PartialDiagnostic Note =
9580 FD ? PDiag(diag::note_function_with_incomplete_return_type_declared_here)
9581 << FD->getDeclName() : PDiag();
9582 SourceLocation NoteLoc = FD ? FD->getLocation() : SourceLocation();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009583
Anders Carlsson8c8d9192009-10-09 23:51:55 +00009584 if (RequireCompleteType(Loc, ReturnType,
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009585 FD ?
Anders Carlsson8c8d9192009-10-09 23:51:55 +00009586 PDiag(diag::err_call_function_incomplete_return)
9587 << CE->getSourceRange() << FD->getDeclName() :
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009588 PDiag(diag::err_call_incomplete_return)
Anders Carlsson8c8d9192009-10-09 23:51:55 +00009589 << CE->getSourceRange(),
9590 std::make_pair(NoteLoc, Note)))
9591 return true;
9592
9593 return false;
9594}
9595
Douglas Gregor92c3a042011-01-19 16:50:08 +00009596// Diagnose the s/=/==/ and s/\|=/!=/ typos. Note that adding parentheses
John McCall5a881bb2009-10-12 21:59:07 +00009597// will prevent this condition from triggering, which is what we want.
9598void Sema::DiagnoseAssignmentAsCondition(Expr *E) {
9599 SourceLocation Loc;
9600
John McCalla52ef082009-11-11 02:41:58 +00009601 unsigned diagnostic = diag::warn_condition_is_assignment;
Douglas Gregor92c3a042011-01-19 16:50:08 +00009602 bool IsOrAssign = false;
John McCalla52ef082009-11-11 02:41:58 +00009603
Chandler Carruthb33c19f2011-08-16 22:30:10 +00009604 if (BinaryOperator *Op = dyn_cast<BinaryOperator>(E)) {
Douglas Gregor92c3a042011-01-19 16:50:08 +00009605 if (Op->getOpcode() != BO_Assign && Op->getOpcode() != BO_OrAssign)
John McCall5a881bb2009-10-12 21:59:07 +00009606 return;
9607
Douglas Gregor92c3a042011-01-19 16:50:08 +00009608 IsOrAssign = Op->getOpcode() == BO_OrAssign;
9609
John McCallc8d8ac52009-11-12 00:06:05 +00009610 // Greylist some idioms by putting them into a warning subcategory.
9611 if (ObjCMessageExpr *ME
9612 = dyn_cast<ObjCMessageExpr>(Op->getRHS()->IgnoreParenCasts())) {
9613 Selector Sel = ME->getSelector();
9614
John McCallc8d8ac52009-11-12 00:06:05 +00009615 // self = [<foo> init...]
Douglas Gregorc737acb2011-09-27 16:10:05 +00009616 if (isSelfExpr(Op->getLHS()) && Sel.getNameForSlot(0).startswith("init"))
John McCallc8d8ac52009-11-12 00:06:05 +00009617 diagnostic = diag::warn_condition_is_idiomatic_assignment;
9618
9619 // <foo> = [<bar> nextObject]
Douglas Gregor813d8342011-02-18 22:29:55 +00009620 else if (Sel.isUnarySelector() && Sel.getNameForSlot(0) == "nextObject")
John McCallc8d8ac52009-11-12 00:06:05 +00009621 diagnostic = diag::warn_condition_is_idiomatic_assignment;
9622 }
John McCalla52ef082009-11-11 02:41:58 +00009623
John McCall5a881bb2009-10-12 21:59:07 +00009624 Loc = Op->getOperatorLoc();
Chandler Carruthb33c19f2011-08-16 22:30:10 +00009625 } else if (CXXOperatorCallExpr *Op = dyn_cast<CXXOperatorCallExpr>(E)) {
Douglas Gregor92c3a042011-01-19 16:50:08 +00009626 if (Op->getOperator() != OO_Equal && Op->getOperator() != OO_PipeEqual)
John McCall5a881bb2009-10-12 21:59:07 +00009627 return;
9628
Douglas Gregor92c3a042011-01-19 16:50:08 +00009629 IsOrAssign = Op->getOperator() == OO_PipeEqual;
John McCall5a881bb2009-10-12 21:59:07 +00009630 Loc = Op->getOperatorLoc();
9631 } else {
9632 // Not an assignment.
9633 return;
9634 }
9635
Douglas Gregor55b38842010-04-14 16:09:52 +00009636 Diag(Loc, diagnostic) << E->getSourceRange();
Douglas Gregor92c3a042011-01-19 16:50:08 +00009637
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +00009638 SourceLocation Open = E->getSourceRange().getBegin();
9639 SourceLocation Close = PP.getLocForEndOfToken(E->getSourceRange().getEnd());
9640 Diag(Loc, diag::note_condition_assign_silence)
9641 << FixItHint::CreateInsertion(Open, "(")
9642 << FixItHint::CreateInsertion(Close, ")");
9643
Douglas Gregor92c3a042011-01-19 16:50:08 +00009644 if (IsOrAssign)
9645 Diag(Loc, diag::note_condition_or_assign_to_comparison)
9646 << FixItHint::CreateReplacement(Loc, "!=");
9647 else
9648 Diag(Loc, diag::note_condition_assign_to_comparison)
9649 << FixItHint::CreateReplacement(Loc, "==");
John McCall5a881bb2009-10-12 21:59:07 +00009650}
9651
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +00009652/// \brief Redundant parentheses over an equality comparison can indicate
9653/// that the user intended an assignment used as condition.
Richard Trieuccd891a2011-09-09 01:45:06 +00009654void Sema::DiagnoseEqualityWithExtraParens(ParenExpr *ParenE) {
Argyrios Kyrtzidiscf1620a2011-02-01 22:23:56 +00009655 // Don't warn if the parens came from a macro.
Richard Trieuccd891a2011-09-09 01:45:06 +00009656 SourceLocation parenLoc = ParenE->getLocStart();
Argyrios Kyrtzidiscf1620a2011-02-01 22:23:56 +00009657 if (parenLoc.isInvalid() || parenLoc.isMacroID())
9658 return;
Argyrios Kyrtzidis170a6a22011-03-28 23:52:04 +00009659 // Don't warn for dependent expressions.
Richard Trieuccd891a2011-09-09 01:45:06 +00009660 if (ParenE->isTypeDependent())
Argyrios Kyrtzidis170a6a22011-03-28 23:52:04 +00009661 return;
Argyrios Kyrtzidiscf1620a2011-02-01 22:23:56 +00009662
Richard Trieuccd891a2011-09-09 01:45:06 +00009663 Expr *E = ParenE->IgnoreParens();
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +00009664
9665 if (BinaryOperator *opE = dyn_cast<BinaryOperator>(E))
Argyrios Kyrtzidis70f23302011-02-01 19:32:59 +00009666 if (opE->getOpcode() == BO_EQ &&
9667 opE->getLHS()->IgnoreParenImpCasts()->isModifiableLvalue(Context)
9668 == Expr::MLV_Valid) {
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +00009669 SourceLocation Loc = opE->getOperatorLoc();
Ted Kremenek006ae382011-02-01 22:36:09 +00009670
Ted Kremenekf7275cd2011-02-02 02:20:30 +00009671 Diag(Loc, diag::warn_equality_with_extra_parens) << E->getSourceRange();
Ted Kremenekf7275cd2011-02-02 02:20:30 +00009672 Diag(Loc, diag::note_equality_comparison_silence)
Richard Trieuccd891a2011-09-09 01:45:06 +00009673 << FixItHint::CreateRemoval(ParenE->getSourceRange().getBegin())
9674 << FixItHint::CreateRemoval(ParenE->getSourceRange().getEnd());
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +00009675 Diag(Loc, diag::note_equality_comparison_to_assign)
9676 << FixItHint::CreateReplacement(Loc, "=");
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +00009677 }
9678}
9679
John Wiegley429bb272011-04-08 18:41:53 +00009680ExprResult Sema::CheckBooleanCondition(Expr *E, SourceLocation Loc) {
John McCall5a881bb2009-10-12 21:59:07 +00009681 DiagnoseAssignmentAsCondition(E);
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +00009682 if (ParenExpr *parenE = dyn_cast<ParenExpr>(E))
9683 DiagnoseEqualityWithExtraParens(parenE);
John McCall5a881bb2009-10-12 21:59:07 +00009684
John McCall864c0412011-04-26 20:42:42 +00009685 ExprResult result = CheckPlaceholderExpr(E);
9686 if (result.isInvalid()) return ExprError();
9687 E = result.take();
Argyrios Kyrtzidis11ab7902010-11-01 18:49:26 +00009688
John McCall864c0412011-04-26 20:42:42 +00009689 if (!E->isTypeDependent()) {
John McCallf6a16482010-12-04 03:47:34 +00009690 if (getLangOptions().CPlusPlus)
9691 return CheckCXXBooleanCondition(E); // C++ 6.4p4
9692
John Wiegley429bb272011-04-08 18:41:53 +00009693 ExprResult ERes = DefaultFunctionArrayLvalueConversion(E);
9694 if (ERes.isInvalid())
9695 return ExprError();
9696 E = ERes.take();
John McCallabc56c72010-12-04 06:09:13 +00009697
9698 QualType T = E->getType();
John Wiegley429bb272011-04-08 18:41:53 +00009699 if (!T->isScalarType()) { // C99 6.8.4.1p1
9700 Diag(Loc, diag::err_typecheck_statement_requires_scalar)
9701 << T << E->getSourceRange();
9702 return ExprError();
9703 }
John McCall5a881bb2009-10-12 21:59:07 +00009704 }
9705
John Wiegley429bb272011-04-08 18:41:53 +00009706 return Owned(E);
John McCall5a881bb2009-10-12 21:59:07 +00009707}
Douglas Gregor586596f2010-05-06 17:25:47 +00009708
John McCall60d7b3a2010-08-24 06:29:42 +00009709ExprResult Sema::ActOnBooleanCondition(Scope *S, SourceLocation Loc,
Richard Trieuccd891a2011-09-09 01:45:06 +00009710 Expr *SubExpr) {
9711 if (!SubExpr)
Douglas Gregor586596f2010-05-06 17:25:47 +00009712 return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00009713
Richard Trieuccd891a2011-09-09 01:45:06 +00009714 return CheckBooleanCondition(SubExpr, Loc);
Douglas Gregor586596f2010-05-06 17:25:47 +00009715}
John McCall2a984ca2010-10-12 00:20:44 +00009716
John McCall1de4d4e2011-04-07 08:22:57 +00009717namespace {
John McCall755d8492011-04-12 00:42:48 +00009718 /// A visitor for rebuilding a call to an __unknown_any expression
9719 /// to have an appropriate type.
9720 struct RebuildUnknownAnyFunction
9721 : StmtVisitor<RebuildUnknownAnyFunction, ExprResult> {
9722
9723 Sema &S;
9724
9725 RebuildUnknownAnyFunction(Sema &S) : S(S) {}
9726
9727 ExprResult VisitStmt(Stmt *S) {
9728 llvm_unreachable("unexpected statement!");
9729 return ExprError();
9730 }
9731
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009732 ExprResult VisitExpr(Expr *E) {
9733 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_call)
9734 << E->getSourceRange();
John McCall755d8492011-04-12 00:42:48 +00009735 return ExprError();
9736 }
9737
9738 /// Rebuild an expression which simply semantically wraps another
9739 /// expression which it shares the type and value kind of.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009740 template <class T> ExprResult rebuildSugarExpr(T *E) {
9741 ExprResult SubResult = Visit(E->getSubExpr());
9742 if (SubResult.isInvalid()) return ExprError();
John McCall755d8492011-04-12 00:42:48 +00009743
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009744 Expr *SubExpr = SubResult.take();
9745 E->setSubExpr(SubExpr);
9746 E->setType(SubExpr->getType());
9747 E->setValueKind(SubExpr->getValueKind());
9748 assert(E->getObjectKind() == OK_Ordinary);
9749 return E;
John McCall755d8492011-04-12 00:42:48 +00009750 }
9751
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009752 ExprResult VisitParenExpr(ParenExpr *E) {
9753 return rebuildSugarExpr(E);
John McCall755d8492011-04-12 00:42:48 +00009754 }
9755
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009756 ExprResult VisitUnaryExtension(UnaryOperator *E) {
9757 return rebuildSugarExpr(E);
John McCall755d8492011-04-12 00:42:48 +00009758 }
9759
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009760 ExprResult VisitUnaryAddrOf(UnaryOperator *E) {
9761 ExprResult SubResult = Visit(E->getSubExpr());
9762 if (SubResult.isInvalid()) return ExprError();
John McCall755d8492011-04-12 00:42:48 +00009763
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009764 Expr *SubExpr = SubResult.take();
9765 E->setSubExpr(SubExpr);
9766 E->setType(S.Context.getPointerType(SubExpr->getType()));
9767 assert(E->getValueKind() == VK_RValue);
9768 assert(E->getObjectKind() == OK_Ordinary);
9769 return E;
John McCall755d8492011-04-12 00:42:48 +00009770 }
9771
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009772 ExprResult resolveDecl(Expr *E, ValueDecl *VD) {
9773 if (!isa<FunctionDecl>(VD)) return VisitExpr(E);
John McCall755d8492011-04-12 00:42:48 +00009774
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009775 E->setType(VD->getType());
John McCall755d8492011-04-12 00:42:48 +00009776
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009777 assert(E->getValueKind() == VK_RValue);
John McCall755d8492011-04-12 00:42:48 +00009778 if (S.getLangOptions().CPlusPlus &&
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009779 !(isa<CXXMethodDecl>(VD) &&
9780 cast<CXXMethodDecl>(VD)->isInstance()))
9781 E->setValueKind(VK_LValue);
John McCall755d8492011-04-12 00:42:48 +00009782
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009783 return E;
John McCall755d8492011-04-12 00:42:48 +00009784 }
9785
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009786 ExprResult VisitMemberExpr(MemberExpr *E) {
9787 return resolveDecl(E, E->getMemberDecl());
John McCall755d8492011-04-12 00:42:48 +00009788 }
9789
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009790 ExprResult VisitDeclRefExpr(DeclRefExpr *E) {
9791 return resolveDecl(E, E->getDecl());
John McCall755d8492011-04-12 00:42:48 +00009792 }
9793 };
9794}
9795
9796/// Given a function expression of unknown-any type, try to rebuild it
9797/// to have a function type.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009798static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *FunctionExpr) {
9799 ExprResult Result = RebuildUnknownAnyFunction(S).Visit(FunctionExpr);
9800 if (Result.isInvalid()) return ExprError();
9801 return S.DefaultFunctionArrayConversion(Result.take());
John McCall755d8492011-04-12 00:42:48 +00009802}
9803
9804namespace {
John McCall379b5152011-04-11 07:02:50 +00009805 /// A visitor for rebuilding an expression of type __unknown_anytype
9806 /// into one which resolves the type directly on the referring
9807 /// expression. Strict preservation of the original source
9808 /// structure is not a goal.
John McCall1de4d4e2011-04-07 08:22:57 +00009809 struct RebuildUnknownAnyExpr
John McCalla5fc4722011-04-09 22:50:59 +00009810 : StmtVisitor<RebuildUnknownAnyExpr, ExprResult> {
John McCall1de4d4e2011-04-07 08:22:57 +00009811
9812 Sema &S;
9813
9814 /// The current destination type.
9815 QualType DestType;
9816
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009817 RebuildUnknownAnyExpr(Sema &S, QualType CastType)
9818 : S(S), DestType(CastType) {}
John McCall1de4d4e2011-04-07 08:22:57 +00009819
John McCalla5fc4722011-04-09 22:50:59 +00009820 ExprResult VisitStmt(Stmt *S) {
John McCall379b5152011-04-11 07:02:50 +00009821 llvm_unreachable("unexpected statement!");
John McCalla5fc4722011-04-09 22:50:59 +00009822 return ExprError();
John McCall1de4d4e2011-04-07 08:22:57 +00009823 }
9824
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009825 ExprResult VisitExpr(Expr *E) {
9826 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_expr)
9827 << E->getSourceRange();
John McCall379b5152011-04-11 07:02:50 +00009828 return ExprError();
John McCall1de4d4e2011-04-07 08:22:57 +00009829 }
9830
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009831 ExprResult VisitCallExpr(CallExpr *E);
9832 ExprResult VisitObjCMessageExpr(ObjCMessageExpr *E);
John McCall379b5152011-04-11 07:02:50 +00009833
John McCalla5fc4722011-04-09 22:50:59 +00009834 /// Rebuild an expression which simply semantically wraps another
9835 /// expression which it shares the type and value kind of.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009836 template <class T> ExprResult rebuildSugarExpr(T *E) {
9837 ExprResult SubResult = Visit(E->getSubExpr());
9838 if (SubResult.isInvalid()) return ExprError();
9839 Expr *SubExpr = SubResult.take();
9840 E->setSubExpr(SubExpr);
9841 E->setType(SubExpr->getType());
9842 E->setValueKind(SubExpr->getValueKind());
9843 assert(E->getObjectKind() == OK_Ordinary);
9844 return E;
John McCalla5fc4722011-04-09 22:50:59 +00009845 }
John McCall1de4d4e2011-04-07 08:22:57 +00009846
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009847 ExprResult VisitParenExpr(ParenExpr *E) {
9848 return rebuildSugarExpr(E);
John McCalla5fc4722011-04-09 22:50:59 +00009849 }
9850
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009851 ExprResult VisitUnaryExtension(UnaryOperator *E) {
9852 return rebuildSugarExpr(E);
John McCalla5fc4722011-04-09 22:50:59 +00009853 }
9854
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009855 ExprResult VisitUnaryAddrOf(UnaryOperator *E) {
9856 const PointerType *Ptr = DestType->getAs<PointerType>();
9857 if (!Ptr) {
9858 S.Diag(E->getOperatorLoc(), diag::err_unknown_any_addrof)
9859 << E->getSourceRange();
John McCall755d8492011-04-12 00:42:48 +00009860 return ExprError();
9861 }
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009862 assert(E->getValueKind() == VK_RValue);
9863 assert(E->getObjectKind() == OK_Ordinary);
9864 E->setType(DestType);
John McCall755d8492011-04-12 00:42:48 +00009865
9866 // Build the sub-expression as if it were an object of the pointee type.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009867 DestType = Ptr->getPointeeType();
9868 ExprResult SubResult = Visit(E->getSubExpr());
9869 if (SubResult.isInvalid()) return ExprError();
9870 E->setSubExpr(SubResult.take());
9871 return E;
John McCall755d8492011-04-12 00:42:48 +00009872 }
9873
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009874 ExprResult VisitImplicitCastExpr(ImplicitCastExpr *E);
John McCalla5fc4722011-04-09 22:50:59 +00009875
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009876 ExprResult resolveDecl(Expr *E, ValueDecl *VD);
John McCalla5fc4722011-04-09 22:50:59 +00009877
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009878 ExprResult VisitMemberExpr(MemberExpr *E) {
9879 return resolveDecl(E, E->getMemberDecl());
John McCall755d8492011-04-12 00:42:48 +00009880 }
John McCalla5fc4722011-04-09 22:50:59 +00009881
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009882 ExprResult VisitDeclRefExpr(DeclRefExpr *E) {
9883 return resolveDecl(E, E->getDecl());
John McCall1de4d4e2011-04-07 08:22:57 +00009884 }
9885 };
9886}
9887
John McCall379b5152011-04-11 07:02:50 +00009888/// Rebuilds a call expression which yielded __unknown_anytype.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009889ExprResult RebuildUnknownAnyExpr::VisitCallExpr(CallExpr *E) {
9890 Expr *CalleeExpr = E->getCallee();
John McCall379b5152011-04-11 07:02:50 +00009891
9892 enum FnKind {
John McCallf5307512011-04-27 00:36:17 +00009893 FK_MemberFunction,
John McCall379b5152011-04-11 07:02:50 +00009894 FK_FunctionPointer,
9895 FK_BlockPointer
9896 };
9897
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009898 FnKind Kind;
9899 QualType CalleeType = CalleeExpr->getType();
9900 if (CalleeType == S.Context.BoundMemberTy) {
9901 assert(isa<CXXMemberCallExpr>(E) || isa<CXXOperatorCallExpr>(E));
9902 Kind = FK_MemberFunction;
9903 CalleeType = Expr::findBoundMemberType(CalleeExpr);
9904 } else if (const PointerType *Ptr = CalleeType->getAs<PointerType>()) {
9905 CalleeType = Ptr->getPointeeType();
9906 Kind = FK_FunctionPointer;
John McCall379b5152011-04-11 07:02:50 +00009907 } else {
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009908 CalleeType = CalleeType->castAs<BlockPointerType>()->getPointeeType();
9909 Kind = FK_BlockPointer;
John McCall379b5152011-04-11 07:02:50 +00009910 }
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009911 const FunctionType *FnType = CalleeType->castAs<FunctionType>();
John McCall379b5152011-04-11 07:02:50 +00009912
9913 // Verify that this is a legal result type of a function.
9914 if (DestType->isArrayType() || DestType->isFunctionType()) {
9915 unsigned diagID = diag::err_func_returning_array_function;
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009916 if (Kind == FK_BlockPointer)
John McCall379b5152011-04-11 07:02:50 +00009917 diagID = diag::err_block_returning_array_function;
9918
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009919 S.Diag(E->getExprLoc(), diagID)
John McCall379b5152011-04-11 07:02:50 +00009920 << DestType->isFunctionType() << DestType;
9921 return ExprError();
9922 }
9923
9924 // Otherwise, go ahead and set DestType as the call's result.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009925 E->setType(DestType.getNonLValueExprType(S.Context));
9926 E->setValueKind(Expr::getValueKindForType(DestType));
9927 assert(E->getObjectKind() == OK_Ordinary);
John McCall379b5152011-04-11 07:02:50 +00009928
9929 // Rebuild the function type, replacing the result type with DestType.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009930 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FnType))
John McCall379b5152011-04-11 07:02:50 +00009931 DestType = S.Context.getFunctionType(DestType,
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009932 Proto->arg_type_begin(),
9933 Proto->getNumArgs(),
9934 Proto->getExtProtoInfo());
John McCall379b5152011-04-11 07:02:50 +00009935 else
9936 DestType = S.Context.getFunctionNoProtoType(DestType,
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009937 FnType->getExtInfo());
John McCall379b5152011-04-11 07:02:50 +00009938
9939 // Rebuild the appropriate pointer-to-function type.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009940 switch (Kind) {
John McCallf5307512011-04-27 00:36:17 +00009941 case FK_MemberFunction:
John McCall379b5152011-04-11 07:02:50 +00009942 // Nothing to do.
9943 break;
9944
9945 case FK_FunctionPointer:
9946 DestType = S.Context.getPointerType(DestType);
9947 break;
9948
9949 case FK_BlockPointer:
9950 DestType = S.Context.getBlockPointerType(DestType);
9951 break;
9952 }
9953
9954 // Finally, we can recurse.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009955 ExprResult CalleeResult = Visit(CalleeExpr);
9956 if (!CalleeResult.isUsable()) return ExprError();
9957 E->setCallee(CalleeResult.take());
John McCall379b5152011-04-11 07:02:50 +00009958
9959 // Bind a temporary if necessary.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009960 return S.MaybeBindToTemporary(E);
John McCall379b5152011-04-11 07:02:50 +00009961}
9962
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009963ExprResult RebuildUnknownAnyExpr::VisitObjCMessageExpr(ObjCMessageExpr *E) {
John McCall755d8492011-04-12 00:42:48 +00009964 // Verify that this is a legal result type of a call.
9965 if (DestType->isArrayType() || DestType->isFunctionType()) {
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009966 S.Diag(E->getExprLoc(), diag::err_func_returning_array_function)
John McCall755d8492011-04-12 00:42:48 +00009967 << DestType->isFunctionType() << DestType;
9968 return ExprError();
John McCall379b5152011-04-11 07:02:50 +00009969 }
9970
John McCall48218c62011-07-13 17:56:40 +00009971 // Rewrite the method result type if available.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009972 if (ObjCMethodDecl *Method = E->getMethodDecl()) {
9973 assert(Method->getResultType() == S.Context.UnknownAnyTy);
9974 Method->setResultType(DestType);
John McCall48218c62011-07-13 17:56:40 +00009975 }
John McCall755d8492011-04-12 00:42:48 +00009976
John McCall379b5152011-04-11 07:02:50 +00009977 // Change the type of the message.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009978 E->setType(DestType.getNonReferenceType());
9979 E->setValueKind(Expr::getValueKindForType(DestType));
John McCall379b5152011-04-11 07:02:50 +00009980
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009981 return S.MaybeBindToTemporary(E);
John McCall379b5152011-04-11 07:02:50 +00009982}
9983
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009984ExprResult RebuildUnknownAnyExpr::VisitImplicitCastExpr(ImplicitCastExpr *E) {
John McCall755d8492011-04-12 00:42:48 +00009985 // The only case we should ever see here is a function-to-pointer decay.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009986 assert(E->getCastKind() == CK_FunctionToPointerDecay);
9987 assert(E->getValueKind() == VK_RValue);
9988 assert(E->getObjectKind() == OK_Ordinary);
John McCall379b5152011-04-11 07:02:50 +00009989
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009990 E->setType(DestType);
John McCall755d8492011-04-12 00:42:48 +00009991
John McCall379b5152011-04-11 07:02:50 +00009992 // Rebuild the sub-expression as the pointee (function) type.
9993 DestType = DestType->castAs<PointerType>()->getPointeeType();
9994
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009995 ExprResult Result = Visit(E->getSubExpr());
9996 if (!Result.isUsable()) return ExprError();
John McCall379b5152011-04-11 07:02:50 +00009997
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009998 E->setSubExpr(Result.take());
9999 return S.Owned(E);
John McCall379b5152011-04-11 07:02:50 +000010000}
10001
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010002ExprResult RebuildUnknownAnyExpr::resolveDecl(Expr *E, ValueDecl *VD) {
10003 ExprValueKind ValueKind = VK_LValue;
10004 QualType Type = DestType;
John McCall379b5152011-04-11 07:02:50 +000010005
10006 // We know how to make this work for certain kinds of decls:
10007
10008 // - functions
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010009 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(VD)) {
10010 if (const PointerType *Ptr = Type->getAs<PointerType>()) {
10011 DestType = Ptr->getPointeeType();
10012 ExprResult Result = resolveDecl(E, VD);
10013 if (Result.isInvalid()) return ExprError();
10014 return S.ImpCastExprToType(Result.take(), Type,
John McCalla19950e2011-08-10 04:12:23 +000010015 CK_FunctionToPointerDecay, VK_RValue);
10016 }
10017
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010018 if (!Type->isFunctionType()) {
10019 S.Diag(E->getExprLoc(), diag::err_unknown_any_function)
10020 << VD << E->getSourceRange();
John McCalla19950e2011-08-10 04:12:23 +000010021 return ExprError();
10022 }
John McCall379b5152011-04-11 07:02:50 +000010023
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010024 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
10025 if (MD->isInstance()) {
10026 ValueKind = VK_RValue;
10027 Type = S.Context.BoundMemberTy;
John McCallf5307512011-04-27 00:36:17 +000010028 }
10029
John McCall379b5152011-04-11 07:02:50 +000010030 // Function references aren't l-values in C.
10031 if (!S.getLangOptions().CPlusPlus)
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010032 ValueKind = VK_RValue;
John McCall379b5152011-04-11 07:02:50 +000010033
10034 // - variables
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010035 } else if (isa<VarDecl>(VD)) {
10036 if (const ReferenceType *RefTy = Type->getAs<ReferenceType>()) {
10037 Type = RefTy->getPointeeType();
10038 } else if (Type->isFunctionType()) {
10039 S.Diag(E->getExprLoc(), diag::err_unknown_any_var_function_type)
10040 << VD << E->getSourceRange();
John McCall755d8492011-04-12 00:42:48 +000010041 return ExprError();
John McCall379b5152011-04-11 07:02:50 +000010042 }
10043
10044 // - nothing else
10045 } else {
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010046 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_decl)
10047 << VD << E->getSourceRange();
John McCall379b5152011-04-11 07:02:50 +000010048 return ExprError();
10049 }
10050
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010051 VD->setType(DestType);
10052 E->setType(Type);
10053 E->setValueKind(ValueKind);
10054 return S.Owned(E);
John McCall379b5152011-04-11 07:02:50 +000010055}
10056
John McCall1de4d4e2011-04-07 08:22:57 +000010057/// Check a cast of an unknown-any type. We intentionally only
10058/// trigger this for C-style casts.
Richard Trieuccd891a2011-09-09 01:45:06 +000010059ExprResult Sema::checkUnknownAnyCast(SourceRange TypeRange, QualType CastType,
10060 Expr *CastExpr, CastKind &CastKind,
10061 ExprValueKind &VK, CXXCastPath &Path) {
John McCall1de4d4e2011-04-07 08:22:57 +000010062 // Rewrite the casted expression from scratch.
Richard Trieuccd891a2011-09-09 01:45:06 +000010063 ExprResult result = RebuildUnknownAnyExpr(*this, CastType).Visit(CastExpr);
John McCalla5fc4722011-04-09 22:50:59 +000010064 if (!result.isUsable()) return ExprError();
John McCall1de4d4e2011-04-07 08:22:57 +000010065
Richard Trieuccd891a2011-09-09 01:45:06 +000010066 CastExpr = result.take();
10067 VK = CastExpr->getValueKind();
10068 CastKind = CK_NoOp;
John McCalla5fc4722011-04-09 22:50:59 +000010069
Richard Trieuccd891a2011-09-09 01:45:06 +000010070 return CastExpr;
John McCall1de4d4e2011-04-07 08:22:57 +000010071}
10072
Richard Trieuccd891a2011-09-09 01:45:06 +000010073static ExprResult diagnoseUnknownAnyExpr(Sema &S, Expr *E) {
10074 Expr *orig = E;
John McCall379b5152011-04-11 07:02:50 +000010075 unsigned diagID = diag::err_uncasted_use_of_unknown_any;
John McCall1de4d4e2011-04-07 08:22:57 +000010076 while (true) {
Richard Trieuccd891a2011-09-09 01:45:06 +000010077 E = E->IgnoreParenImpCasts();
10078 if (CallExpr *call = dyn_cast<CallExpr>(E)) {
10079 E = call->getCallee();
John McCall379b5152011-04-11 07:02:50 +000010080 diagID = diag::err_uncasted_call_of_unknown_any;
10081 } else {
John McCall1de4d4e2011-04-07 08:22:57 +000010082 break;
John McCall379b5152011-04-11 07:02:50 +000010083 }
John McCall1de4d4e2011-04-07 08:22:57 +000010084 }
10085
John McCall379b5152011-04-11 07:02:50 +000010086 SourceLocation loc;
10087 NamedDecl *d;
Richard Trieuccd891a2011-09-09 01:45:06 +000010088 if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(E)) {
John McCall379b5152011-04-11 07:02:50 +000010089 loc = ref->getLocation();
10090 d = ref->getDecl();
Richard Trieuccd891a2011-09-09 01:45:06 +000010091 } else if (MemberExpr *mem = dyn_cast<MemberExpr>(E)) {
John McCall379b5152011-04-11 07:02:50 +000010092 loc = mem->getMemberLoc();
10093 d = mem->getMemberDecl();
Richard Trieuccd891a2011-09-09 01:45:06 +000010094 } else if (ObjCMessageExpr *msg = dyn_cast<ObjCMessageExpr>(E)) {
John McCall379b5152011-04-11 07:02:50 +000010095 diagID = diag::err_uncasted_call_of_unknown_any;
Argyrios Kyrtzidis20718082011-10-03 06:36:51 +000010096 loc = msg->getSelectorStartLoc();
John McCall379b5152011-04-11 07:02:50 +000010097 d = msg->getMethodDecl();
John McCall819e7452011-08-31 20:57:36 +000010098 if (!d) {
10099 S.Diag(loc, diag::err_uncasted_send_to_unknown_any_method)
10100 << static_cast<unsigned>(msg->isClassMessage()) << msg->getSelector()
10101 << orig->getSourceRange();
10102 return ExprError();
10103 }
John McCall379b5152011-04-11 07:02:50 +000010104 } else {
Richard Trieuccd891a2011-09-09 01:45:06 +000010105 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_expr)
10106 << E->getSourceRange();
John McCall379b5152011-04-11 07:02:50 +000010107 return ExprError();
10108 }
10109
10110 S.Diag(loc, diagID) << d << orig->getSourceRange();
John McCall1de4d4e2011-04-07 08:22:57 +000010111
10112 // Never recoverable.
10113 return ExprError();
10114}
10115
John McCall2a984ca2010-10-12 00:20:44 +000010116/// Check for operands with placeholder types and complain if found.
10117/// Returns true if there was an error and no recovery was possible.
John McCallfb8721c2011-04-10 19:13:55 +000010118ExprResult Sema::CheckPlaceholderExpr(Expr *E) {
John McCall5acb0c92011-10-17 18:40:02 +000010119 const BuiltinType *placeholderType = E->getType()->getAsPlaceholderType();
10120 if (!placeholderType) return Owned(E);
10121
10122 switch (placeholderType->getKind()) {
John McCall2a984ca2010-10-12 00:20:44 +000010123
John McCall1de4d4e2011-04-07 08:22:57 +000010124 // Overloaded expressions.
John McCall5acb0c92011-10-17 18:40:02 +000010125 case BuiltinType::Overload: {
John McCall6dbba4f2011-10-11 23:14:30 +000010126 // Try to resolve a single function template specialization.
10127 // This is obligatory.
10128 ExprResult result = Owned(E);
10129 if (ResolveAndFixSingleFunctionTemplateSpecialization(result, false)) {
10130 return result;
10131
10132 // If that failed, try to recover with a call.
10133 } else {
10134 tryToRecoverWithCall(result, PDiag(diag::err_ovl_unresolvable),
10135 /*complain*/ true);
10136 return result;
10137 }
10138 }
John McCall1de4d4e2011-04-07 08:22:57 +000010139
John McCall864c0412011-04-26 20:42:42 +000010140 // Bound member functions.
John McCall5acb0c92011-10-17 18:40:02 +000010141 case BuiltinType::BoundMember: {
John McCall6dbba4f2011-10-11 23:14:30 +000010142 ExprResult result = Owned(E);
10143 tryToRecoverWithCall(result, PDiag(diag::err_bound_member_function),
10144 /*complain*/ true);
10145 return result;
John McCall5acb0c92011-10-17 18:40:02 +000010146 }
10147
10148 // ARC unbridged casts.
10149 case BuiltinType::ARCUnbridgedCast: {
10150 Expr *realCast = stripARCUnbridgedCast(E);
10151 diagnoseARCUnbridgedCast(realCast);
10152 return Owned(realCast);
10153 }
John McCall864c0412011-04-26 20:42:42 +000010154
John McCall1de4d4e2011-04-07 08:22:57 +000010155 // Expressions of unknown type.
John McCall5acb0c92011-10-17 18:40:02 +000010156 case BuiltinType::UnknownAny:
John McCall1de4d4e2011-04-07 08:22:57 +000010157 return diagnoseUnknownAnyExpr(*this, E);
10158
John McCall3c3b7f92011-10-25 17:37:35 +000010159 // Pseudo-objects.
10160 case BuiltinType::PseudoObject:
10161 return checkPseudoObjectRValue(E);
10162
John McCalle0a22d02011-10-18 21:02:43 +000010163 // Everything else should be impossible.
10164#define BUILTIN_TYPE(Id, SingletonId) \
10165 case BuiltinType::Id:
10166#define PLACEHOLDER_TYPE(Id, SingletonId)
10167#include "clang/AST/BuiltinTypes.def"
John McCall5acb0c92011-10-17 18:40:02 +000010168 break;
10169 }
10170
10171 llvm_unreachable("invalid placeholder type!");
John McCall2a984ca2010-10-12 00:20:44 +000010172}
Richard Trieubb9b80c2011-04-21 21:44:26 +000010173
Richard Trieuccd891a2011-09-09 01:45:06 +000010174bool Sema::CheckCaseExpression(Expr *E) {
10175 if (E->isTypeDependent())
Richard Trieubb9b80c2011-04-21 21:44:26 +000010176 return true;
Richard Trieuccd891a2011-09-09 01:45:06 +000010177 if (E->isValueDependent() || E->isIntegerConstantExpr(Context))
10178 return E->getType()->isIntegralOrEnumerationType();
Richard Trieubb9b80c2011-04-21 21:44:26 +000010179 return false;
10180}