blob: 75caa6f5855ab48292626b0b735479e4f1e44134 [file] [log] [blame]
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 Jahanianb76a97e2011-12-07 00:30:00 +000065AvailabilityResult
66Sema::DiagnoseAvailabilityOfDecl(
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +000067 NamedDecl *D, SourceLocation Loc,
68 const ObjCInterfaceDecl *UnknownObjCClass) {
69 // See if this declaration is unavailable or deprecated.
70 std::string Message;
71 AvailabilityResult Result = D->getAvailability(&Message);
Fariborz Jahanian39b4fc82011-11-28 19:45:58 +000072 if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D))
73 if (Result == AR_Available) {
74 const DeclContext *DC = ECD->getDeclContext();
75 if (const EnumDecl *TheEnumDecl = dyn_cast<EnumDecl>(DC))
76 Result = TheEnumDecl->getAvailability(&Message);
77 }
78
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +000079 switch (Result) {
80 case AR_Available:
81 case AR_NotYetIntroduced:
82 break;
83
84 case AR_Deprecated:
Fariborz Jahanianb76a97e2011-12-07 00:30:00 +000085 EmitDeprecationWarning(D, Message, Loc, UnknownObjCClass);
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +000086 break;
87
88 case AR_Unavailable:
Fariborz Jahanianb76a97e2011-12-07 00:30:00 +000089 if (getCurContextAvailability() != AR_Unavailable) {
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +000090 if (Message.empty()) {
91 if (!UnknownObjCClass)
Fariborz Jahanianb76a97e2011-12-07 00:30:00 +000092 Diag(Loc, diag::err_unavailable) << D->getDeclName();
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +000093 else
Fariborz Jahanianb76a97e2011-12-07 00:30:00 +000094 Diag(Loc, diag::warn_unavailable_fwdclass_message)
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +000095 << D->getDeclName();
96 }
97 else
Fariborz Jahanianb76a97e2011-12-07 00:30:00 +000098 Diag(Loc, diag::err_unavailable_message)
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +000099 << D->getDeclName() << Message;
Fariborz Jahanianb76a97e2011-12-07 00:30:00 +0000100 Diag(D->getLocation(), diag::note_unavailable_here)
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +0000101 << isa<FunctionDecl>(D) << false;
102 }
103 break;
104 }
105 return Result;
106}
107
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000108/// \brief Determine whether the use of this declaration is valid, and
109/// emit any corresponding diagnostics.
110///
111/// This routine diagnoses various problems with referencing
112/// declarations that can occur when using a declaration. For example,
113/// it might warn if a deprecated or unavailable declaration is being
114/// used, or produce an error (and return true) if a C++0x deleted
115/// function is being used.
116///
117/// \returns true if there was an error (this declaration cannot be
118/// referenced), false otherwise.
Chris Lattner52338262009-10-25 22:31:57 +0000119///
Fariborz Jahanian8e5fc9b2010-12-21 00:44:01 +0000120bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc,
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +0000121 const ObjCInterfaceDecl *UnknownObjCClass) {
Douglas Gregor9b623632010-10-12 23:32:35 +0000122 if (getLangOptions().CPlusPlus && isa<FunctionDecl>(D)) {
123 // If there were any diagnostics suppressed by template argument deduction,
124 // emit them now.
Chris Lattner5f9e2722011-07-23 10:55:15 +0000125 llvm::DenseMap<Decl *, SmallVector<PartialDiagnosticAt, 1> >::iterator
Douglas Gregor9b623632010-10-12 23:32:35 +0000126 Pos = SuppressedDiagnostics.find(D->getCanonicalDecl());
127 if (Pos != SuppressedDiagnostics.end()) {
Chris Lattner5f9e2722011-07-23 10:55:15 +0000128 SmallVectorImpl<PartialDiagnosticAt> &Suppressed = Pos->second;
Douglas Gregor9b623632010-10-12 23:32:35 +0000129 for (unsigned I = 0, N = Suppressed.size(); I != N; ++I)
130 Diag(Suppressed[I].first, Suppressed[I].second);
131
132 // Clear out the list of suppressed diagnostics, so that we don't emit
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000133 // them again for this specialization. However, we don't obsolete this
Douglas Gregor9b623632010-10-12 23:32:35 +0000134 // entry from the table, because we want to avoid ever emitting these
135 // diagnostics again.
136 Suppressed.clear();
137 }
138 }
139
Richard Smith34b41d92011-02-20 03:19:35 +0000140 // See if this is an auto-typed variable whose initializer we are parsing.
Richard Smith483b9f32011-02-21 20:05:19 +0000141 if (ParsingInitForAutoVars.count(D)) {
142 Diag(Loc, diag::err_auto_variable_cannot_appear_in_own_initializer)
143 << D->getDeclName();
144 return true;
Richard Smith34b41d92011-02-20 03:19:35 +0000145 }
146
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000147 // See if this is a deleted function.
Douglas Gregor25d944a2009-02-24 04:26:15 +0000148 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000149 if (FD->isDeleted()) {
150 Diag(Loc, diag::err_deleted_function_use);
John McCallf85e1932011-06-15 23:02:42 +0000151 Diag(D->getLocation(), diag::note_unavailable_here) << 1 << true;
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000152 return true;
153 }
Douglas Gregor25d944a2009-02-24 04:26:15 +0000154 }
Fariborz Jahanianb76a97e2011-12-07 00:30:00 +0000155 DiagnoseAvailabilityOfDecl(D, Loc, UnknownObjCClass);
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000156
Anders Carlsson2127ecc2010-10-22 23:37:08 +0000157 // Warn if this is used but marked unused.
Fariborz Jahanian0f32caf2011-09-29 22:45:21 +0000158 if (D->hasAttr<UnusedAttr>())
Anders Carlsson2127ecc2010-10-22 23:37:08 +0000159 Diag(Loc, diag::warn_used_but_marked_unused) << D->getDeclName();
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000160 return false;
Chris Lattner76a642f2009-02-15 22:43:40 +0000161}
162
Douglas Gregor0a0d2b12011-03-23 00:50:03 +0000163/// \brief Retrieve the message suffix that should be added to a
164/// diagnostic complaining about the given function being deleted or
165/// unavailable.
166std::string Sema::getDeletedOrUnavailableSuffix(const FunctionDecl *FD) {
167 // FIXME: C++0x implicitly-deleted special member functions could be
168 // detected here so that we could improve diagnostics to say, e.g.,
169 // "base class 'A' had a deleted copy constructor".
170 if (FD->isDeleted())
171 return std::string();
172
173 std::string Message;
174 if (FD->getAvailability(&Message))
175 return ": " + Message;
176
177 return std::string();
178}
179
John McCall3323fad2011-09-09 07:56:05 +0000180/// DiagnoseSentinelCalls - This routine checks whether a call or
181/// message-send is to a declaration with the sentinel attribute, and
182/// if so, it checks that the requirements of the sentinel are
183/// satisfied.
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000184void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
John McCall3323fad2011-09-09 07:56:05 +0000185 Expr **args, unsigned numArgs) {
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000186 const SentinelAttr *attr = D->getAttr<SentinelAttr>();
Mike Stump1eb44332009-09-09 15:08:12 +0000187 if (!attr)
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000188 return;
Douglas Gregor92e986e2010-04-22 16:44:27 +0000189
John McCall3323fad2011-09-09 07:56:05 +0000190 // The number of formal parameters of the declaration.
191 unsigned numFormalParams;
Mike Stump1eb44332009-09-09 15:08:12 +0000192
John McCall3323fad2011-09-09 07:56:05 +0000193 // The kind of declaration. This is also an index into a %select in
194 // the diagnostic.
195 enum CalleeType { CT_Function, CT_Method, CT_Block } calleeType;
196
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000197 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
John McCall3323fad2011-09-09 07:56:05 +0000198 numFormalParams = MD->param_size();
199 calleeType = CT_Method;
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000200 } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
John McCall3323fad2011-09-09 07:56:05 +0000201 numFormalParams = FD->param_size();
202 calleeType = CT_Function;
203 } else if (isa<VarDecl>(D)) {
204 QualType type = cast<ValueDecl>(D)->getType();
205 const FunctionType *fn = 0;
206 if (const PointerType *ptr = type->getAs<PointerType>()) {
207 fn = ptr->getPointeeType()->getAs<FunctionType>();
208 if (!fn) return;
209 calleeType = CT_Function;
210 } else if (const BlockPointerType *ptr = type->getAs<BlockPointerType>()) {
211 fn = ptr->getPointeeType()->castAs<FunctionType>();
212 calleeType = CT_Block;
213 } else {
Fariborz Jahaniandaf04152009-05-15 20:33:25 +0000214 return;
John McCall3323fad2011-09-09 07:56:05 +0000215 }
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000216
John McCall3323fad2011-09-09 07:56:05 +0000217 if (const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(fn)) {
218 numFormalParams = proto->getNumArgs();
219 } else {
220 numFormalParams = 0;
221 }
222 } else {
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000223 return;
224 }
John McCall3323fad2011-09-09 07:56:05 +0000225
226 // "nullPos" is the number of formal parameters at the end which
227 // effectively count as part of the variadic arguments. This is
228 // useful if you would prefer to not have *any* formal parameters,
229 // but the language forces you to have at least one.
230 unsigned nullPos = attr->getNullPos();
231 assert((nullPos == 0 || nullPos == 1) && "invalid null position on sentinel");
232 numFormalParams = (nullPos > numFormalParams ? 0 : numFormalParams - nullPos);
233
234 // The number of arguments which should follow the sentinel.
235 unsigned numArgsAfterSentinel = attr->getSentinel();
236
237 // If there aren't enough arguments for all the formal parameters,
238 // the sentinel, and the args after the sentinel, complain.
239 if (numArgs < numFormalParams + numArgsAfterSentinel + 1) {
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000240 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName();
John McCall3323fad2011-09-09 07:56:05 +0000241 Diag(D->getLocation(), diag::note_sentinel_here) << calleeType;
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000242 return;
243 }
John McCall3323fad2011-09-09 07:56:05 +0000244
245 // Otherwise, find the sentinel expression.
246 Expr *sentinelExpr = args[numArgs - numArgsAfterSentinel - 1];
John McCall8eb662e2010-05-06 23:53:00 +0000247 if (!sentinelExpr) return;
John McCall8eb662e2010-05-06 23:53:00 +0000248 if (sentinelExpr->isValueDependent()) return;
Anders Carlsson343e6ff2010-11-05 15:21:33 +0000249
250 // nullptr_t is always treated as null.
251 if (sentinelExpr->getType()->isNullPtrType()) return;
252
Fariborz Jahanian9ccd7252010-07-14 16:37:51 +0000253 if (sentinelExpr->getType()->isAnyPointerType() &&
John McCall8eb662e2010-05-06 23:53:00 +0000254 sentinelExpr->IgnoreParenCasts()->isNullPointerConstant(Context,
255 Expr::NPC_ValueDependentIsNull))
256 return;
257
258 // Unfortunately, __null has type 'int'.
259 if (isa<GNUNullExpr>(sentinelExpr)) return;
260
John McCall3323fad2011-09-09 07:56:05 +0000261 // Pick a reasonable string to insert. Optimistically use 'nil' or
262 // 'NULL' if those are actually defined in the context. Only use
263 // 'nil' for ObjC methods, where it's much more likely that the
264 // variadic arguments form a list of object pointers.
265 SourceLocation MissingNilLoc
Douglas Gregorf78c4e52011-07-30 08:57:03 +0000266 = PP.getLocForEndOfToken(sentinelExpr->getLocEnd());
267 std::string NullValue;
John McCall3323fad2011-09-09 07:56:05 +0000268 if (calleeType == CT_Method &&
269 PP.getIdentifierInfo("nil")->hasMacroDefinition())
Douglas Gregorf78c4e52011-07-30 08:57:03 +0000270 NullValue = "nil";
271 else if (PP.getIdentifierInfo("NULL")->hasMacroDefinition())
272 NullValue = "NULL";
Douglas Gregorf78c4e52011-07-30 08:57:03 +0000273 else
John McCall3323fad2011-09-09 07:56:05 +0000274 NullValue = "(void*) 0";
Eli Friedman39834ba2011-09-27 23:46:37 +0000275
276 if (MissingNilLoc.isInvalid())
277 Diag(Loc, diag::warn_missing_sentinel) << calleeType;
278 else
279 Diag(MissingNilLoc, diag::warn_missing_sentinel)
280 << calleeType
281 << FixItHint::CreateInsertion(MissingNilLoc, ", " + NullValue);
John McCall3323fad2011-09-09 07:56:05 +0000282 Diag(D->getLocation(), diag::note_sentinel_here) << calleeType;
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000283}
284
Richard Trieuccd891a2011-09-09 01:45:06 +0000285SourceRange Sema::getExprRange(Expr *E) const {
286 return E ? E->getSourceRange() : SourceRange();
Douglas Gregor4b2d3f72009-02-26 21:00:50 +0000287}
288
Chris Lattnere7a2e912008-07-25 21:10:04 +0000289//===----------------------------------------------------------------------===//
290// Standard Promotions and Conversions
291//===----------------------------------------------------------------------===//
292
Chris Lattnere7a2e912008-07-25 21:10:04 +0000293/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4).
John Wiegley429bb272011-04-08 18:41:53 +0000294ExprResult Sema::DefaultFunctionArrayConversion(Expr *E) {
John McCall6dbba4f2011-10-11 23:14:30 +0000295 // Handle any placeholder expressions which made it here.
296 if (E->getType()->isPlaceholderType()) {
297 ExprResult result = CheckPlaceholderExpr(E);
298 if (result.isInvalid()) return ExprError();
299 E = result.take();
300 }
301
Chris Lattnere7a2e912008-07-25 21:10:04 +0000302 QualType Ty = E->getType();
303 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type");
304
Chris Lattnere7a2e912008-07-25 21:10:04 +0000305 if (Ty->isFunctionType())
John Wiegley429bb272011-04-08 18:41:53 +0000306 E = ImpCastExprToType(E, Context.getPointerType(Ty),
307 CK_FunctionToPointerDecay).take();
Chris Lattner67d33d82008-07-25 21:33:13 +0000308 else if (Ty->isArrayType()) {
309 // In C90 mode, arrays only promote to pointers if the array expression is
310 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has
311 // type 'array of type' is converted to an expression that has type 'pointer
312 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression
313 // that has type 'array of type' ...". The relevant change is "an lvalue"
314 // (C90) to "an expression" (C99).
Argyrios Kyrtzidisc39a3d72008-09-11 04:25:59 +0000315 //
316 // C++ 4.2p1:
317 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of
318 // T" can be converted to an rvalue of type "pointer to T".
319 //
John McCall7eb0a9e2010-11-24 05:12:34 +0000320 if (getLangOptions().C99 || getLangOptions().CPlusPlus || E->isLValue())
John Wiegley429bb272011-04-08 18:41:53 +0000321 E = ImpCastExprToType(E, Context.getArrayDecayedType(Ty),
322 CK_ArrayToPointerDecay).take();
Chris Lattner67d33d82008-07-25 21:33:13 +0000323 }
John Wiegley429bb272011-04-08 18:41:53 +0000324 return Owned(E);
Chris Lattnere7a2e912008-07-25 21:10:04 +0000325}
326
Argyrios Kyrtzidis8a285ae2011-04-26 17:41:22 +0000327static void CheckForNullPointerDereference(Sema &S, Expr *E) {
328 // Check to see if we are dereferencing a null pointer. If so,
329 // and if not volatile-qualified, this is undefined behavior that the
330 // optimizer will delete, so warn about it. People sometimes try to use this
331 // to get a deterministic trap and are surprised by clang's behavior. This
332 // only handles the pattern "*null", which is a very syntactic check.
333 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E->IgnoreParenCasts()))
334 if (UO->getOpcode() == UO_Deref &&
335 UO->getSubExpr()->IgnoreParenCasts()->
336 isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull) &&
337 !UO->getType().isVolatileQualified()) {
338 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
339 S.PDiag(diag::warn_indirection_through_null)
340 << UO->getSubExpr()->getSourceRange());
341 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
342 S.PDiag(diag::note_indirection_through_null));
343 }
344}
345
John Wiegley429bb272011-04-08 18:41:53 +0000346ExprResult Sema::DefaultLvalueConversion(Expr *E) {
John McCall6dbba4f2011-10-11 23:14:30 +0000347 // Handle any placeholder expressions which made it here.
348 if (E->getType()->isPlaceholderType()) {
349 ExprResult result = CheckPlaceholderExpr(E);
350 if (result.isInvalid()) return ExprError();
351 E = result.take();
352 }
353
John McCall0ae287a2010-12-01 04:43:34 +0000354 // C++ [conv.lval]p1:
355 // A glvalue of a non-function, non-array type T can be
356 // converted to a prvalue.
John Wiegley429bb272011-04-08 18:41:53 +0000357 if (!E->isGLValue()) return Owned(E);
Kaelyn Uhraind6c88652011-08-05 23:18:04 +0000358
John McCall409fa9a2010-12-06 20:48:59 +0000359 QualType T = E->getType();
360 assert(!T.isNull() && "r-value conversion on typeless expression?");
John McCallf6a16482010-12-04 03:47:34 +0000361
Eli Friedmanb001de72011-10-06 23:00:33 +0000362 // We can't do lvalue-to-rvalue on atomics yet.
John McCall3c3b7f92011-10-25 17:37:35 +0000363 if (T->isAtomicType())
Eli Friedmanb001de72011-10-06 23:00:33 +0000364 return Owned(E);
365
John McCall409fa9a2010-12-06 20:48:59 +0000366 // We don't want to throw lvalue-to-rvalue casts on top of
367 // expressions of certain types in C++.
368 if (getLangOptions().CPlusPlus &&
369 (E->getType() == Context.OverloadTy ||
370 T->isDependentType() ||
371 T->isRecordType()))
John Wiegley429bb272011-04-08 18:41:53 +0000372 return Owned(E);
John McCall409fa9a2010-12-06 20:48:59 +0000373
374 // The C standard is actually really unclear on this point, and
375 // DR106 tells us what the result should be but not why. It's
376 // generally best to say that void types just doesn't undergo
377 // lvalue-to-rvalue at all. Note that expressions of unqualified
378 // 'void' type are never l-values, but qualified void can be.
379 if (T->isVoidType())
John Wiegley429bb272011-04-08 18:41:53 +0000380 return Owned(E);
John McCall409fa9a2010-12-06 20:48:59 +0000381
Argyrios Kyrtzidis8a285ae2011-04-26 17:41:22 +0000382 CheckForNullPointerDereference(*this, E);
383
John McCall409fa9a2010-12-06 20:48:59 +0000384 // C++ [conv.lval]p1:
385 // [...] If T is a non-class type, the type of the prvalue is the
386 // cv-unqualified version of T. Otherwise, the type of the
387 // rvalue is T.
388 //
389 // C99 6.3.2.1p2:
390 // If the lvalue has qualified type, the value has the unqualified
391 // version of the type of the lvalue; otherwise, the value has the
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000392 // type of the lvalue.
John McCall409fa9a2010-12-06 20:48:59 +0000393 if (T.hasQualifiers())
394 T = T.getUnqualifiedType();
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000395
396 ExprResult Res = Owned(ImplicitCastExpr::Create(Context, T, CK_LValueToRValue,
397 E, 0, VK_RValue));
398
399 return Res;
John McCall409fa9a2010-12-06 20:48:59 +0000400}
401
John Wiegley429bb272011-04-08 18:41:53 +0000402ExprResult Sema::DefaultFunctionArrayLvalueConversion(Expr *E) {
403 ExprResult Res = DefaultFunctionArrayConversion(E);
404 if (Res.isInvalid())
405 return ExprError();
406 Res = DefaultLvalueConversion(Res.take());
407 if (Res.isInvalid())
408 return ExprError();
409 return move(Res);
Douglas Gregora873dfc2010-02-03 00:27:59 +0000410}
411
412
Chris Lattnere7a2e912008-07-25 21:10:04 +0000413/// UsualUnaryConversions - Performs various conversions that are common to most
Mike Stump1eb44332009-09-09 15:08:12 +0000414/// operators (C99 6.3). The conversions of array and function types are
Chris Lattnerfc8f0e12011-04-15 05:22:18 +0000415/// sometimes suppressed. For example, the array->pointer conversion doesn't
Chris Lattnere7a2e912008-07-25 21:10:04 +0000416/// apply if the array is an argument to the sizeof or address (&) operators.
417/// In these instances, this routine should *not* be called.
John Wiegley429bb272011-04-08 18:41:53 +0000418ExprResult Sema::UsualUnaryConversions(Expr *E) {
John McCall0ae287a2010-12-01 04:43:34 +0000419 // First, convert to an r-value.
John Wiegley429bb272011-04-08 18:41:53 +0000420 ExprResult Res = DefaultFunctionArrayLvalueConversion(E);
421 if (Res.isInvalid())
422 return Owned(E);
423 E = Res.take();
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000424
John McCall0ae287a2010-12-01 04:43:34 +0000425 QualType Ty = E->getType();
Chris Lattnere7a2e912008-07-25 21:10:04 +0000426 assert(!Ty.isNull() && "UsualUnaryConversions - missing type");
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000427
428 // Half FP is a bit different: it's a storage-only type, meaning that any
429 // "use" of it should be promoted to float.
430 if (Ty->isHalfType())
431 return ImpCastExprToType(Res.take(), Context.FloatTy, CK_FloatingCast);
432
John McCall0ae287a2010-12-01 04:43:34 +0000433 // Try to perform integral promotions if the object has a theoretically
434 // promotable type.
435 if (Ty->isIntegralOrUnscopedEnumerationType()) {
436 // C99 6.3.1.1p2:
437 //
438 // The following may be used in an expression wherever an int or
439 // unsigned int may be used:
440 // - an object or expression with an integer type whose integer
441 // conversion rank is less than or equal to the rank of int
442 // and unsigned int.
443 // - A bit-field of type _Bool, int, signed int, or unsigned int.
444 //
445 // If an int can represent all values of the original type, the
446 // value is converted to an int; otherwise, it is converted to an
447 // unsigned int. These are called the integer promotions. All
448 // other types are unchanged by the integer promotions.
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000449
John McCall0ae287a2010-12-01 04:43:34 +0000450 QualType PTy = Context.isPromotableBitField(E);
451 if (!PTy.isNull()) {
John Wiegley429bb272011-04-08 18:41:53 +0000452 E = ImpCastExprToType(E, PTy, CK_IntegralCast).take();
453 return Owned(E);
John McCall0ae287a2010-12-01 04:43:34 +0000454 }
455 if (Ty->isPromotableIntegerType()) {
456 QualType PT = Context.getPromotedIntegerType(Ty);
John Wiegley429bb272011-04-08 18:41:53 +0000457 E = ImpCastExprToType(E, PT, CK_IntegralCast).take();
458 return Owned(E);
John McCall0ae287a2010-12-01 04:43:34 +0000459 }
Eli Friedman04e83572009-08-20 04:21:42 +0000460 }
John Wiegley429bb272011-04-08 18:41:53 +0000461 return Owned(E);
Chris Lattnere7a2e912008-07-25 21:10:04 +0000462}
463
Chris Lattner05faf172008-07-25 22:25:12 +0000464/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
Mike Stump1eb44332009-09-09 15:08:12 +0000465/// do not have a prototype. Arguments that have type float are promoted to
Chris Lattner05faf172008-07-25 22:25:12 +0000466/// double. All other argument types are converted by UsualUnaryConversions().
John Wiegley429bb272011-04-08 18:41:53 +0000467ExprResult Sema::DefaultArgumentPromotion(Expr *E) {
468 QualType Ty = E->getType();
Chris Lattner05faf172008-07-25 22:25:12 +0000469 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type");
Mike Stump1eb44332009-09-09 15:08:12 +0000470
John Wiegley429bb272011-04-08 18:41:53 +0000471 ExprResult Res = UsualUnaryConversions(E);
472 if (Res.isInvalid())
473 return Owned(E);
474 E = Res.take();
John McCall40c29132010-12-06 18:36:11 +0000475
Chris Lattner05faf172008-07-25 22:25:12 +0000476 // If this is a 'float' (CVR qualified or typedef) promote to double.
Chris Lattner40378332010-05-16 04:01:30 +0000477 if (Ty->isSpecificBuiltinType(BuiltinType::Float))
John Wiegley429bb272011-04-08 18:41:53 +0000478 E = ImpCastExprToType(E, Context.DoubleTy, CK_FloatingCast).take();
479
John McCall96a914a2011-08-27 22:06:17 +0000480 // C++ performs lvalue-to-rvalue conversion as a default argument
John McCall709bca82011-08-29 23:55:37 +0000481 // promotion, even on class types, but note:
482 // C++11 [conv.lval]p2:
483 // When an lvalue-to-rvalue conversion occurs in an unevaluated
484 // operand or a subexpression thereof the value contained in the
485 // referenced object is not accessed. Otherwise, if the glvalue
486 // has a class type, the conversion copy-initializes a temporary
487 // of type T from the glvalue and the result of the conversion
488 // is a prvalue for the temporary.
489 // FIXME: add some way to gate this entire thing for correctness in
490 // potentially potentially evaluated contexts.
John McCall96a914a2011-08-27 22:06:17 +0000491 if (getLangOptions().CPlusPlus && E->isGLValue() &&
492 ExprEvalContexts.back().Context != Unevaluated) {
John McCall5f8d6042011-08-27 01:09:30 +0000493 ExprResult Temp = PerformCopyInitialization(
494 InitializedEntity::InitializeTemporary(E->getType()),
495 E->getExprLoc(),
496 Owned(E));
497 if (Temp.isInvalid())
498 return ExprError();
499 E = Temp.get();
500 }
501
John Wiegley429bb272011-04-08 18:41:53 +0000502 return Owned(E);
Chris Lattner05faf172008-07-25 22:25:12 +0000503}
504
Chris Lattner312531a2009-04-12 08:11:20 +0000505/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
506/// will warn if the resulting type is not a POD type, and rejects ObjC
John Wiegley429bb272011-04-08 18:41:53 +0000507/// interfaces passed by value.
508ExprResult Sema::DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT,
John McCallf85e1932011-06-15 23:02:42 +0000509 FunctionDecl *FDecl) {
John McCall5acb0c92011-10-17 18:40:02 +0000510 if (const BuiltinType *PlaceholderTy = E->getType()->getAsPlaceholderType()) {
511 // Strip the unbridged-cast placeholder expression off, if applicable.
512 if (PlaceholderTy->getKind() == BuiltinType::ARCUnbridgedCast &&
513 (CT == VariadicMethod ||
514 (FDecl && FDecl->hasAttr<CFAuditedTransferAttr>()))) {
515 E = stripARCUnbridgedCast(E);
516
517 // Otherwise, do normal placeholder checking.
518 } else {
519 ExprResult ExprRes = CheckPlaceholderExpr(E);
520 if (ExprRes.isInvalid())
521 return ExprError();
522 E = ExprRes.take();
523 }
524 }
Douglas Gregor8d5e18c2011-06-17 00:15:10 +0000525
John McCall5acb0c92011-10-17 18:40:02 +0000526 ExprResult ExprRes = DefaultArgumentPromotion(E);
John Wiegley429bb272011-04-08 18:41:53 +0000527 if (ExprRes.isInvalid())
528 return ExprError();
529 E = ExprRes.take();
Mike Stump1eb44332009-09-09 15:08:12 +0000530
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000531 // Don't allow one to pass an Objective-C interface to a vararg.
John Wiegley429bb272011-04-08 18:41:53 +0000532 if (E->getType()->isObjCObjectType() &&
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000533 DiagRuntimeBehavior(E->getLocStart(), 0,
534 PDiag(diag::err_cannot_pass_objc_interface_to_vararg)
535 << E->getType() << CT))
John Wiegley429bb272011-04-08 18:41:53 +0000536 return ExprError();
John McCall5f8d6042011-08-27 01:09:30 +0000537
Douglas Gregorb8e778d2011-10-14 20:34:19 +0000538 // Complain about passing non-POD types through varargs. However, don't
539 // perform this check for incomplete types, which we can get here when we're
540 // in an unevaluated context.
541 if (!E->getType()->isIncompleteType() && !E->getType().isPODType(Context)) {
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000542 // C++0x [expr.call]p7:
543 // Passing a potentially-evaluated argument of class type (Clause 9)
544 // having a non-trivial copy constructor, a non-trivial move constructor,
545 // or a non-trivial destructor, with no corresponding parameter,
546 // is conditionally-supported with implementation-defined semantics.
547 bool TrivialEnough = false;
548 if (getLangOptions().CPlusPlus0x && !E->getType()->isDependentType()) {
549 if (CXXRecordDecl *Record = E->getType()->getAsCXXRecordDecl()) {
550 if (Record->hasTrivialCopyConstructor() &&
551 Record->hasTrivialMoveConstructor() &&
Richard Smithebaf0e62011-10-18 20:49:44 +0000552 Record->hasTrivialDestructor()) {
553 DiagRuntimeBehavior(E->getLocStart(), 0,
554 PDiag(diag::warn_cxx98_compat_pass_non_pod_arg_to_vararg)
555 << E->getType() << CT);
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000556 TrivialEnough = true;
Richard Smithebaf0e62011-10-18 20:49:44 +0000557 }
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000558 }
559 }
John McCallf85e1932011-06-15 23:02:42 +0000560
561 if (!TrivialEnough &&
562 getLangOptions().ObjCAutoRefCount &&
563 E->getType()->isObjCLifetimeType())
564 TrivialEnough = true;
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000565
566 if (TrivialEnough) {
567 // Nothing to diagnose. This is okay.
568 } else if (DiagRuntimeBehavior(E->getLocStart(), 0,
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +0000569 PDiag(diag::warn_cannot_pass_non_pod_arg_to_vararg)
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000570 << getLangOptions().CPlusPlus0x << E->getType()
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000571 << CT)) {
572 // Turn this into a trap.
573 CXXScopeSpec SS;
574 UnqualifiedId Name;
575 Name.setIdentifier(PP.getIdentifierInfo("__builtin_trap"),
576 E->getLocStart());
577 ExprResult TrapFn = ActOnIdExpression(TUScope, SS, Name, true, false);
578 if (TrapFn.isInvalid())
579 return ExprError();
580
581 ExprResult Call = ActOnCallExpr(TUScope, TrapFn.get(), E->getLocStart(),
582 MultiExprArg(), E->getLocEnd());
583 if (Call.isInvalid())
584 return ExprError();
585
586 ExprResult Comma = ActOnBinOp(TUScope, E->getLocStart(), tok::comma,
587 Call.get(), E);
588 if (Comma.isInvalid())
John McCall66c20302011-08-26 18:41:18 +0000589 return ExprError();
Douglas Gregor930a9ab2011-05-21 19:26:31 +0000590 E = Comma.get();
591 }
Douglas Gregor0fd228d2011-05-21 16:27:21 +0000592 }
593
John Wiegley429bb272011-04-08 18:41:53 +0000594 return Owned(E);
Anders Carlssondce5e2c2009-01-16 16:48:51 +0000595}
596
Richard Trieu8289f492011-09-02 20:58:51 +0000597/// \brief Converts an integer to complex float type. Helper function of
598/// UsualArithmeticConversions()
599///
600/// \return false if the integer expression is an integer type and is
601/// successfully converted to the complex type.
Richard Trieuccd891a2011-09-09 01:45:06 +0000602static bool handleIntegerToComplexFloatConversion(Sema &S, ExprResult &IntExpr,
603 ExprResult &ComplexExpr,
604 QualType IntTy,
605 QualType ComplexTy,
606 bool SkipCast) {
607 if (IntTy->isComplexType() || IntTy->isRealFloatingType()) return true;
608 if (SkipCast) return false;
609 if (IntTy->isIntegerType()) {
610 QualType fpTy = cast<ComplexType>(ComplexTy)->getElementType();
611 IntExpr = S.ImpCastExprToType(IntExpr.take(), fpTy, CK_IntegralToFloating);
612 IntExpr = S.ImpCastExprToType(IntExpr.take(), ComplexTy,
Richard Trieu8289f492011-09-02 20:58:51 +0000613 CK_FloatingRealToComplex);
614 } else {
Richard Trieuccd891a2011-09-09 01:45:06 +0000615 assert(IntTy->isComplexIntegerType());
616 IntExpr = S.ImpCastExprToType(IntExpr.take(), ComplexTy,
Richard Trieu8289f492011-09-02 20:58:51 +0000617 CK_IntegralComplexToFloatingComplex);
618 }
619 return false;
620}
621
622/// \brief Takes two complex float types and converts them to the same type.
623/// Helper function of UsualArithmeticConversions()
624static QualType
Richard Trieucafd30b2011-09-06 18:25:09 +0000625handleComplexFloatToComplexFloatConverstion(Sema &S, ExprResult &LHS,
626 ExprResult &RHS, QualType LHSType,
627 QualType RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000628 bool IsCompAssign) {
Richard Trieucafd30b2011-09-06 18:25:09 +0000629 int order = S.Context.getFloatingTypeOrder(LHSType, RHSType);
Richard Trieu8289f492011-09-02 20:58:51 +0000630
631 if (order < 0) {
632 // _Complex float -> _Complex double
Richard Trieuccd891a2011-09-09 01:45:06 +0000633 if (!IsCompAssign)
Richard Trieucafd30b2011-09-06 18:25:09 +0000634 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_FloatingComplexCast);
635 return RHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000636 }
637 if (order > 0)
638 // _Complex float -> _Complex double
Richard Trieucafd30b2011-09-06 18:25:09 +0000639 RHS = S.ImpCastExprToType(RHS.take(), LHSType, CK_FloatingComplexCast);
640 return LHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000641}
642
643/// \brief Converts otherExpr to complex float and promotes complexExpr if
644/// necessary. Helper function of UsualArithmeticConversions()
645static QualType handleOtherComplexFloatConversion(Sema &S,
Richard Trieuccd891a2011-09-09 01:45:06 +0000646 ExprResult &ComplexExpr,
647 ExprResult &OtherExpr,
648 QualType ComplexTy,
649 QualType OtherTy,
650 bool ConvertComplexExpr,
651 bool ConvertOtherExpr) {
652 int order = S.Context.getFloatingTypeOrder(ComplexTy, OtherTy);
Richard Trieu8289f492011-09-02 20:58:51 +0000653
654 // If just the complexExpr is complex, the otherExpr needs to be converted,
655 // and the complexExpr might need to be promoted.
656 if (order > 0) { // complexExpr is wider
657 // float -> _Complex double
Richard Trieuccd891a2011-09-09 01:45:06 +0000658 if (ConvertOtherExpr) {
659 QualType fp = cast<ComplexType>(ComplexTy)->getElementType();
660 OtherExpr = S.ImpCastExprToType(OtherExpr.take(), fp, CK_FloatingCast);
661 OtherExpr = S.ImpCastExprToType(OtherExpr.take(), ComplexTy,
Richard Trieu8289f492011-09-02 20:58:51 +0000662 CK_FloatingRealToComplex);
663 }
Richard Trieuccd891a2011-09-09 01:45:06 +0000664 return ComplexTy;
Richard Trieu8289f492011-09-02 20:58:51 +0000665 }
666
667 // otherTy is at least as wide. Find its corresponding complex type.
Richard Trieuccd891a2011-09-09 01:45:06 +0000668 QualType result = (order == 0 ? ComplexTy :
669 S.Context.getComplexType(OtherTy));
Richard Trieu8289f492011-09-02 20:58:51 +0000670
671 // double -> _Complex double
Richard Trieuccd891a2011-09-09 01:45:06 +0000672 if (ConvertOtherExpr)
673 OtherExpr = S.ImpCastExprToType(OtherExpr.take(), result,
Richard Trieu8289f492011-09-02 20:58:51 +0000674 CK_FloatingRealToComplex);
675
676 // _Complex float -> _Complex double
Richard Trieuccd891a2011-09-09 01:45:06 +0000677 if (ConvertComplexExpr && order < 0)
678 ComplexExpr = S.ImpCastExprToType(ComplexExpr.take(), result,
Richard Trieu8289f492011-09-02 20:58:51 +0000679 CK_FloatingComplexCast);
680
681 return result;
682}
683
684/// \brief Handle arithmetic conversion with complex types. Helper function of
685/// UsualArithmeticConversions()
Richard Trieucafd30b2011-09-06 18:25:09 +0000686static QualType handleComplexFloatConversion(Sema &S, ExprResult &LHS,
687 ExprResult &RHS, QualType LHSType,
688 QualType RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000689 bool IsCompAssign) {
Richard Trieu8289f492011-09-02 20:58:51 +0000690 // if we have an integer operand, the result is the complex type.
Richard Trieucafd30b2011-09-06 18:25:09 +0000691 if (!handleIntegerToComplexFloatConversion(S, RHS, LHS, RHSType, LHSType,
Richard Trieu8289f492011-09-02 20:58:51 +0000692 /*skipCast*/false))
Richard Trieucafd30b2011-09-06 18:25:09 +0000693 return LHSType;
694 if (!handleIntegerToComplexFloatConversion(S, LHS, RHS, LHSType, RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000695 /*skipCast*/IsCompAssign))
Richard Trieucafd30b2011-09-06 18:25:09 +0000696 return RHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000697
698 // This handles complex/complex, complex/float, or float/complex.
699 // When both operands are complex, the shorter operand is converted to the
700 // type of the longer, and that is the type of the result. This corresponds
701 // to what is done when combining two real floating-point operands.
702 // The fun begins when size promotion occur across type domains.
703 // From H&S 6.3.4: When one operand is complex and the other is a real
704 // floating-point type, the less precise type is converted, within it's
705 // real or complex domain, to the precision of the other type. For example,
706 // when combining a "long double" with a "double _Complex", the
707 // "double _Complex" is promoted to "long double _Complex".
708
Richard Trieucafd30b2011-09-06 18:25:09 +0000709 bool LHSComplexFloat = LHSType->isComplexType();
710 bool RHSComplexFloat = RHSType->isComplexType();
Richard Trieu8289f492011-09-02 20:58:51 +0000711
712 // If both are complex, just cast to the more precise type.
713 if (LHSComplexFloat && RHSComplexFloat)
Richard Trieucafd30b2011-09-06 18:25:09 +0000714 return handleComplexFloatToComplexFloatConverstion(S, LHS, RHS,
715 LHSType, RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000716 IsCompAssign);
Richard Trieu8289f492011-09-02 20:58:51 +0000717
718 // If only one operand is complex, promote it if necessary and convert the
719 // other operand to complex.
720 if (LHSComplexFloat)
721 return handleOtherComplexFloatConversion(
Richard Trieuccd891a2011-09-09 01:45:06 +0000722 S, LHS, RHS, LHSType, RHSType, /*convertComplexExpr*/!IsCompAssign,
Richard Trieu8289f492011-09-02 20:58:51 +0000723 /*convertOtherExpr*/ true);
724
725 assert(RHSComplexFloat);
726 return handleOtherComplexFloatConversion(
Richard Trieucafd30b2011-09-06 18:25:09 +0000727 S, RHS, LHS, RHSType, LHSType, /*convertComplexExpr*/true,
Richard Trieuccd891a2011-09-09 01:45:06 +0000728 /*convertOtherExpr*/ !IsCompAssign);
Richard Trieu8289f492011-09-02 20:58:51 +0000729}
730
731/// \brief Hande arithmetic conversion from integer to float. Helper function
732/// of UsualArithmeticConversions()
Richard Trieuccd891a2011-09-09 01:45:06 +0000733static QualType handleIntToFloatConversion(Sema &S, ExprResult &FloatExpr,
734 ExprResult &IntExpr,
735 QualType FloatTy, QualType IntTy,
736 bool ConvertFloat, bool ConvertInt) {
737 if (IntTy->isIntegerType()) {
738 if (ConvertInt)
Richard Trieu8289f492011-09-02 20:58:51 +0000739 // Convert intExpr to the lhs floating point type.
Richard Trieuccd891a2011-09-09 01:45:06 +0000740 IntExpr = S.ImpCastExprToType(IntExpr.take(), FloatTy,
Richard Trieu8289f492011-09-02 20:58:51 +0000741 CK_IntegralToFloating);
Richard Trieuccd891a2011-09-09 01:45:06 +0000742 return FloatTy;
Richard Trieu8289f492011-09-02 20:58:51 +0000743 }
744
745 // Convert both sides to the appropriate complex float.
Richard Trieuccd891a2011-09-09 01:45:06 +0000746 assert(IntTy->isComplexIntegerType());
747 QualType result = S.Context.getComplexType(FloatTy);
Richard Trieu8289f492011-09-02 20:58:51 +0000748
749 // _Complex int -> _Complex float
Richard Trieuccd891a2011-09-09 01:45:06 +0000750 if (ConvertInt)
751 IntExpr = S.ImpCastExprToType(IntExpr.take(), result,
Richard Trieu8289f492011-09-02 20:58:51 +0000752 CK_IntegralComplexToFloatingComplex);
753
754 // float -> _Complex float
Richard Trieuccd891a2011-09-09 01:45:06 +0000755 if (ConvertFloat)
756 FloatExpr = S.ImpCastExprToType(FloatExpr.take(), result,
Richard Trieu8289f492011-09-02 20:58:51 +0000757 CK_FloatingRealToComplex);
758
759 return result;
760}
761
762/// \brief Handle arithmethic conversion with floating point types. Helper
763/// function of UsualArithmeticConversions()
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000764static QualType handleFloatConversion(Sema &S, ExprResult &LHS,
765 ExprResult &RHS, QualType LHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000766 QualType RHSType, bool IsCompAssign) {
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000767 bool LHSFloat = LHSType->isRealFloatingType();
768 bool RHSFloat = RHSType->isRealFloatingType();
Richard Trieu8289f492011-09-02 20:58:51 +0000769
770 // If we have two real floating types, convert the smaller operand
771 // to the bigger result.
772 if (LHSFloat && RHSFloat) {
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000773 int order = S.Context.getFloatingTypeOrder(LHSType, RHSType);
Richard Trieu8289f492011-09-02 20:58:51 +0000774 if (order > 0) {
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000775 RHS = S.ImpCastExprToType(RHS.take(), LHSType, CK_FloatingCast);
776 return LHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000777 }
778
779 assert(order < 0 && "illegal float comparison");
Richard Trieuccd891a2011-09-09 01:45:06 +0000780 if (!IsCompAssign)
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000781 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_FloatingCast);
782 return RHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000783 }
784
785 if (LHSFloat)
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000786 return handleIntToFloatConversion(S, LHS, RHS, LHSType, RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000787 /*convertFloat=*/!IsCompAssign,
Richard Trieu8289f492011-09-02 20:58:51 +0000788 /*convertInt=*/ true);
789 assert(RHSFloat);
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000790 return handleIntToFloatConversion(S, RHS, LHS, RHSType, LHSType,
Richard Trieu8289f492011-09-02 20:58:51 +0000791 /*convertInt=*/ true,
Richard Trieuccd891a2011-09-09 01:45:06 +0000792 /*convertFloat=*/!IsCompAssign);
Richard Trieu8289f492011-09-02 20:58:51 +0000793}
794
795/// \brief Handle conversions with GCC complex int extension. Helper function
Benjamin Kramer5cc86802011-09-06 19:57:14 +0000796/// of UsualArithmeticConversions()
Richard Trieu8289f492011-09-02 20:58:51 +0000797// FIXME: if the operands are (int, _Complex long), we currently
798// don't promote the complex. Also, signedness?
Benjamin Kramer5cc86802011-09-06 19:57:14 +0000799static QualType handleComplexIntConversion(Sema &S, ExprResult &LHS,
800 ExprResult &RHS, QualType LHSType,
801 QualType RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000802 bool IsCompAssign) {
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000803 const ComplexType *LHSComplexInt = LHSType->getAsComplexIntegerType();
804 const ComplexType *RHSComplexInt = RHSType->getAsComplexIntegerType();
Richard Trieu8289f492011-09-02 20:58:51 +0000805
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000806 if (LHSComplexInt && RHSComplexInt) {
807 int order = S.Context.getIntegerTypeOrder(LHSComplexInt->getElementType(),
808 RHSComplexInt->getElementType());
Richard Trieu8289f492011-09-02 20:58:51 +0000809 assert(order && "inequal types with equal element ordering");
810 if (order > 0) {
811 // _Complex int -> _Complex long
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000812 RHS = S.ImpCastExprToType(RHS.take(), LHSType, CK_IntegralComplexCast);
813 return LHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000814 }
815
Richard Trieuccd891a2011-09-09 01:45:06 +0000816 if (!IsCompAssign)
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000817 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_IntegralComplexCast);
818 return RHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000819 }
820
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000821 if (LHSComplexInt) {
Richard Trieu8289f492011-09-02 20:58:51 +0000822 // int -> _Complex int
Eli Friedmanddadaa42011-11-12 03:56:23 +0000823 // FIXME: This needs to take integer ranks into account
824 RHS = S.ImpCastExprToType(RHS.take(), LHSComplexInt->getElementType(),
825 CK_IntegralCast);
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
Eli Friedmanddadaa42011-11-12 03:56:23 +0000832 // FIXME: This needs to take integer ranks into account
833 if (!IsCompAssign) {
834 LHS = S.ImpCastExprToType(LHS.take(), RHSComplexInt->getElementType(),
835 CK_IntegralCast);
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000836 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_IntegralRealToComplex);
Eli Friedmanddadaa42011-11-12 03:56:23 +0000837 }
Richard Trieu8ef5c8e2011-09-06 18:38:41 +0000838 return RHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000839}
840
841/// \brief Handle integer arithmetic conversions. Helper function of
842/// UsualArithmeticConversions()
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000843static QualType handleIntegerConversion(Sema &S, ExprResult &LHS,
844 ExprResult &RHS, QualType LHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000845 QualType RHSType, bool IsCompAssign) {
Richard Trieu8289f492011-09-02 20:58:51 +0000846 // The rules for this case are in C99 6.3.1.8
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000847 int order = S.Context.getIntegerTypeOrder(LHSType, RHSType);
848 bool LHSSigned = LHSType->hasSignedIntegerRepresentation();
849 bool RHSSigned = RHSType->hasSignedIntegerRepresentation();
850 if (LHSSigned == RHSSigned) {
Richard Trieu8289f492011-09-02 20:58:51 +0000851 // Same signedness; use the higher-ranked type
852 if (order >= 0) {
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000853 RHS = S.ImpCastExprToType(RHS.take(), LHSType, CK_IntegralCast);
854 return LHSType;
Richard Trieuccd891a2011-09-09 01:45:06 +0000855 } else if (!IsCompAssign)
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000856 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_IntegralCast);
857 return RHSType;
858 } else if (order != (LHSSigned ? 1 : -1)) {
Richard Trieu8289f492011-09-02 20:58:51 +0000859 // The unsigned type has greater than or equal rank to the
860 // signed type, so use the unsigned type
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000861 if (RHSSigned) {
862 RHS = S.ImpCastExprToType(RHS.take(), LHSType, CK_IntegralCast);
863 return LHSType;
Richard Trieuccd891a2011-09-09 01:45:06 +0000864 } else if (!IsCompAssign)
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000865 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_IntegralCast);
866 return RHSType;
867 } else if (S.Context.getIntWidth(LHSType) != S.Context.getIntWidth(RHSType)) {
Richard Trieu8289f492011-09-02 20:58:51 +0000868 // The two types are different widths; if we are here, that
869 // means the signed type is larger than the unsigned type, so
870 // use the signed type.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000871 if (LHSSigned) {
872 RHS = S.ImpCastExprToType(RHS.take(), LHSType, CK_IntegralCast);
873 return LHSType;
Richard Trieuccd891a2011-09-09 01:45:06 +0000874 } else if (!IsCompAssign)
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000875 LHS = S.ImpCastExprToType(LHS.take(), RHSType, CK_IntegralCast);
876 return RHSType;
Richard Trieu8289f492011-09-02 20:58:51 +0000877 } else {
878 // The signed type is higher-ranked than the unsigned type,
879 // but isn't actually any bigger (like unsigned int and long
880 // on most 32-bit systems). Use the unsigned type corresponding
881 // to the signed type.
882 QualType result =
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000883 S.Context.getCorrespondingUnsignedType(LHSSigned ? LHSType : RHSType);
884 RHS = S.ImpCastExprToType(RHS.take(), result, CK_IntegralCast);
Richard Trieuccd891a2011-09-09 01:45:06 +0000885 if (!IsCompAssign)
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000886 LHS = S.ImpCastExprToType(LHS.take(), result, CK_IntegralCast);
Richard Trieu8289f492011-09-02 20:58:51 +0000887 return result;
888 }
889}
890
Chris Lattnere7a2e912008-07-25 21:10:04 +0000891/// UsualArithmeticConversions - Performs various conversions that are common to
892/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this
Mike Stump1eb44332009-09-09 15:08:12 +0000893/// routine returns the first non-arithmetic type found. The client is
Chris Lattnere7a2e912008-07-25 21:10:04 +0000894/// responsible for emitting appropriate error diagnostics.
895/// FIXME: verify the conversion rules for "complex int" are consistent with
896/// GCC.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000897QualType Sema::UsualArithmeticConversions(ExprResult &LHS, ExprResult &RHS,
Richard Trieuccd891a2011-09-09 01:45:06 +0000898 bool IsCompAssign) {
899 if (!IsCompAssign) {
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000900 LHS = UsualUnaryConversions(LHS.take());
901 if (LHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +0000902 return QualType();
903 }
Eli Friedmanab3a8522009-03-28 01:22:36 +0000904
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000905 RHS = UsualUnaryConversions(RHS.take());
906 if (RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +0000907 return QualType();
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000908
Mike Stump1eb44332009-09-09 15:08:12 +0000909 // For conversion purposes, we ignore any qualifiers.
Chris Lattnere7a2e912008-07-25 21:10:04 +0000910 // For example, "const float" and "float" are equivalent.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000911 QualType LHSType =
912 Context.getCanonicalType(LHS.get()->getType()).getUnqualifiedType();
913 QualType RHSType =
914 Context.getCanonicalType(RHS.get()->getType()).getUnqualifiedType();
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000915
916 // If both types are identical, no conversion is needed.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000917 if (LHSType == RHSType)
918 return LHSType;
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000919
920 // If either side is a non-arithmetic type (e.g. a pointer), we are done.
921 // The caller can deal with this (e.g. pointer + int).
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000922 if (!LHSType->isArithmeticType() || !RHSType->isArithmeticType())
923 return LHSType;
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000924
John McCallcf33b242010-11-13 08:17:45 +0000925 // Apply unary and bitfield promotions to the LHS's type.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000926 QualType LHSUnpromotedType = LHSType;
927 if (LHSType->isPromotableIntegerType())
928 LHSType = Context.getPromotedIntegerType(LHSType);
929 QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(LHS.get());
Douglas Gregor2d833e32009-05-02 00:36:19 +0000930 if (!LHSBitfieldPromoteTy.isNull())
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000931 LHSType = LHSBitfieldPromoteTy;
Richard Trieuccd891a2011-09-09 01:45:06 +0000932 if (LHSType != LHSUnpromotedType && !IsCompAssign)
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000933 LHS = ImpCastExprToType(LHS.take(), LHSType, CK_IntegralCast);
Douglas Gregor2d833e32009-05-02 00:36:19 +0000934
John McCallcf33b242010-11-13 08:17:45 +0000935 // If both types are identical, no conversion is needed.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000936 if (LHSType == RHSType)
937 return LHSType;
John McCallcf33b242010-11-13 08:17:45 +0000938
939 // At this point, we have two different arithmetic types.
940
941 // Handle complex types first (C99 6.3.1.8p1).
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000942 if (LHSType->isComplexType() || RHSType->isComplexType())
943 return handleComplexFloatConversion(*this, LHS, RHS, LHSType, RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000944 IsCompAssign);
John McCallcf33b242010-11-13 08:17:45 +0000945
946 // Now handle "real" floating types (i.e. float, double, long double).
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000947 if (LHSType->isRealFloatingType() || RHSType->isRealFloatingType())
948 return handleFloatConversion(*this, LHS, RHS, LHSType, RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000949 IsCompAssign);
John McCallcf33b242010-11-13 08:17:45 +0000950
951 // Handle GCC complex int extension.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000952 if (LHSType->isComplexIntegerType() || RHSType->isComplexIntegerType())
Benjamin Kramer5cc86802011-09-06 19:57:14 +0000953 return handleComplexIntConversion(*this, LHS, RHS, LHSType, RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000954 IsCompAssign);
John McCallcf33b242010-11-13 08:17:45 +0000955
956 // Finally, we have two differing integer types.
Richard Trieu2e8a95d2011-09-06 19:52:52 +0000957 return handleIntegerConversion(*this, LHS, RHS, LHSType, RHSType,
Richard Trieuccd891a2011-09-09 01:45:06 +0000958 IsCompAssign);
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000959}
960
Chris Lattnere7a2e912008-07-25 21:10:04 +0000961//===----------------------------------------------------------------------===//
962// Semantic Analysis for various Expression Types
963//===----------------------------------------------------------------------===//
964
965
Peter Collingbournef111d932011-04-15 00:35:48 +0000966ExprResult
967Sema::ActOnGenericSelectionExpr(SourceLocation KeyLoc,
968 SourceLocation DefaultLoc,
969 SourceLocation RParenLoc,
970 Expr *ControllingExpr,
Richard Trieuccd891a2011-09-09 01:45:06 +0000971 MultiTypeArg ArgTypes,
972 MultiExprArg ArgExprs) {
973 unsigned NumAssocs = ArgTypes.size();
974 assert(NumAssocs == ArgExprs.size());
Peter Collingbournef111d932011-04-15 00:35:48 +0000975
Richard Trieuccd891a2011-09-09 01:45:06 +0000976 ParsedType *ParsedTypes = ArgTypes.release();
977 Expr **Exprs = ArgExprs.release();
Peter Collingbournef111d932011-04-15 00:35:48 +0000978
979 TypeSourceInfo **Types = new TypeSourceInfo*[NumAssocs];
980 for (unsigned i = 0; i < NumAssocs; ++i) {
981 if (ParsedTypes[i])
982 (void) GetTypeFromParser(ParsedTypes[i], &Types[i]);
983 else
984 Types[i] = 0;
985 }
986
987 ExprResult ER = CreateGenericSelectionExpr(KeyLoc, DefaultLoc, RParenLoc,
988 ControllingExpr, Types, Exprs,
989 NumAssocs);
Benjamin Kramer5bf47f72011-04-15 11:21:57 +0000990 delete [] Types;
Peter Collingbournef111d932011-04-15 00:35:48 +0000991 return ER;
992}
993
994ExprResult
995Sema::CreateGenericSelectionExpr(SourceLocation KeyLoc,
996 SourceLocation DefaultLoc,
997 SourceLocation RParenLoc,
998 Expr *ControllingExpr,
999 TypeSourceInfo **Types,
1000 Expr **Exprs,
1001 unsigned NumAssocs) {
1002 bool TypeErrorFound = false,
1003 IsResultDependent = ControllingExpr->isTypeDependent(),
1004 ContainsUnexpandedParameterPack
1005 = ControllingExpr->containsUnexpandedParameterPack();
1006
1007 for (unsigned i = 0; i < NumAssocs; ++i) {
1008 if (Exprs[i]->containsUnexpandedParameterPack())
1009 ContainsUnexpandedParameterPack = true;
1010
1011 if (Types[i]) {
1012 if (Types[i]->getType()->containsUnexpandedParameterPack())
1013 ContainsUnexpandedParameterPack = true;
1014
1015 if (Types[i]->getType()->isDependentType()) {
1016 IsResultDependent = true;
1017 } else {
Benjamin Kramerffbe9b92011-12-23 17:00:35 +00001018 // C11 6.5.1.1p2 "The type name in a generic association shall specify a
Peter Collingbournef111d932011-04-15 00:35:48 +00001019 // complete object type other than a variably modified type."
1020 unsigned D = 0;
1021 if (Types[i]->getType()->isIncompleteType())
1022 D = diag::err_assoc_type_incomplete;
1023 else if (!Types[i]->getType()->isObjectType())
1024 D = diag::err_assoc_type_nonobject;
1025 else if (Types[i]->getType()->isVariablyModifiedType())
1026 D = diag::err_assoc_type_variably_modified;
1027
1028 if (D != 0) {
1029 Diag(Types[i]->getTypeLoc().getBeginLoc(), D)
1030 << Types[i]->getTypeLoc().getSourceRange()
1031 << Types[i]->getType();
1032 TypeErrorFound = true;
1033 }
1034
Benjamin Kramerffbe9b92011-12-23 17:00:35 +00001035 // C11 6.5.1.1p2 "No two generic associations in the same generic
Peter Collingbournef111d932011-04-15 00:35:48 +00001036 // selection shall specify compatible types."
1037 for (unsigned j = i+1; j < NumAssocs; ++j)
1038 if (Types[j] && !Types[j]->getType()->isDependentType() &&
1039 Context.typesAreCompatible(Types[i]->getType(),
1040 Types[j]->getType())) {
1041 Diag(Types[j]->getTypeLoc().getBeginLoc(),
1042 diag::err_assoc_compatible_types)
1043 << Types[j]->getTypeLoc().getSourceRange()
1044 << Types[j]->getType()
1045 << Types[i]->getType();
1046 Diag(Types[i]->getTypeLoc().getBeginLoc(),
1047 diag::note_compat_assoc)
1048 << Types[i]->getTypeLoc().getSourceRange()
1049 << Types[i]->getType();
1050 TypeErrorFound = true;
1051 }
1052 }
1053 }
1054 }
1055 if (TypeErrorFound)
1056 return ExprError();
1057
1058 // If we determined that the generic selection is result-dependent, don't
1059 // try to compute the result expression.
1060 if (IsResultDependent)
1061 return Owned(new (Context) GenericSelectionExpr(
1062 Context, KeyLoc, ControllingExpr,
1063 Types, Exprs, NumAssocs, DefaultLoc,
1064 RParenLoc, ContainsUnexpandedParameterPack));
1065
Chris Lattner5f9e2722011-07-23 10:55:15 +00001066 SmallVector<unsigned, 1> CompatIndices;
Peter Collingbournef111d932011-04-15 00:35:48 +00001067 unsigned DefaultIndex = -1U;
1068 for (unsigned i = 0; i < NumAssocs; ++i) {
1069 if (!Types[i])
1070 DefaultIndex = i;
1071 else if (Context.typesAreCompatible(ControllingExpr->getType(),
1072 Types[i]->getType()))
1073 CompatIndices.push_back(i);
1074 }
1075
Benjamin Kramerffbe9b92011-12-23 17:00:35 +00001076 // C11 6.5.1.1p2 "The controlling expression of a generic selection shall have
Peter Collingbournef111d932011-04-15 00:35:48 +00001077 // type compatible with at most one of the types named in its generic
1078 // association list."
1079 if (CompatIndices.size() > 1) {
1080 // We strip parens here because the controlling expression is typically
1081 // parenthesized in macro definitions.
1082 ControllingExpr = ControllingExpr->IgnoreParens();
1083 Diag(ControllingExpr->getLocStart(), diag::err_generic_sel_multi_match)
1084 << ControllingExpr->getSourceRange() << ControllingExpr->getType()
1085 << (unsigned) CompatIndices.size();
Chris Lattner5f9e2722011-07-23 10:55:15 +00001086 for (SmallVector<unsigned, 1>::iterator I = CompatIndices.begin(),
Peter Collingbournef111d932011-04-15 00:35:48 +00001087 E = CompatIndices.end(); I != E; ++I) {
1088 Diag(Types[*I]->getTypeLoc().getBeginLoc(),
1089 diag::note_compat_assoc)
1090 << Types[*I]->getTypeLoc().getSourceRange()
1091 << Types[*I]->getType();
1092 }
1093 return ExprError();
1094 }
1095
Benjamin Kramerffbe9b92011-12-23 17:00:35 +00001096 // C11 6.5.1.1p2 "If a generic selection has no default generic association,
Peter Collingbournef111d932011-04-15 00:35:48 +00001097 // its controlling expression shall have type compatible with exactly one of
1098 // the types named in its generic association list."
1099 if (DefaultIndex == -1U && CompatIndices.size() == 0) {
1100 // We strip parens here because the controlling expression is typically
1101 // parenthesized in macro definitions.
1102 ControllingExpr = ControllingExpr->IgnoreParens();
1103 Diag(ControllingExpr->getLocStart(), diag::err_generic_sel_no_match)
1104 << ControllingExpr->getSourceRange() << ControllingExpr->getType();
1105 return ExprError();
1106 }
1107
Benjamin Kramerffbe9b92011-12-23 17:00:35 +00001108 // C11 6.5.1.1p3 "If a generic selection has a generic association with a
Peter Collingbournef111d932011-04-15 00:35:48 +00001109 // type name that is compatible with the type of the controlling expression,
1110 // then the result expression of the generic selection is the expression
1111 // in that generic association. Otherwise, the result expression of the
1112 // generic selection is the expression in the default generic association."
1113 unsigned ResultIndex =
1114 CompatIndices.size() ? CompatIndices[0] : DefaultIndex;
1115
1116 return Owned(new (Context) GenericSelectionExpr(
1117 Context, KeyLoc, ControllingExpr,
1118 Types, Exprs, NumAssocs, DefaultLoc,
1119 RParenLoc, ContainsUnexpandedParameterPack,
1120 ResultIndex));
1121}
1122
Steve Narofff69936d2007-09-16 03:34:24 +00001123/// ActOnStringLiteral - The specified tokens were lexed as pasted string
Reid Spencer5f016e22007-07-11 17:01:13 +00001124/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string
1125/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from
1126/// multiple tokens. However, the common case is that StringToks points to one
1127/// string.
Sebastian Redlcd965b92009-01-18 18:53:16 +00001128///
John McCall60d7b3a2010-08-24 06:29:42 +00001129ExprResult
Sean Hunt6cf75022010-08-30 17:47:05 +00001130Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) {
Reid Spencer5f016e22007-07-11 17:01:13 +00001131 assert(NumStringToks && "Must have at least one string!");
1132
Chris Lattnerbbee00b2009-01-16 18:51:42 +00001133 StringLiteralParser Literal(StringToks, NumStringToks, PP);
Reid Spencer5f016e22007-07-11 17:01:13 +00001134 if (Literal.hadError)
Sebastian Redlcd965b92009-01-18 18:53:16 +00001135 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00001136
Chris Lattner5f9e2722011-07-23 10:55:15 +00001137 SmallVector<SourceLocation, 4> StringTokLocs;
Reid Spencer5f016e22007-07-11 17:01:13 +00001138 for (unsigned i = 0; i != NumStringToks; ++i)
1139 StringTokLocs.push_back(StringToks[i].getLocation());
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001140
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001141 QualType StrTy = Context.CharTy;
Douglas Gregor5cee1192011-07-27 05:40:30 +00001142 if (Literal.isWide())
Anders Carlsson96b4adc2011-04-06 18:42:48 +00001143 StrTy = Context.getWCharType();
Douglas Gregor5cee1192011-07-27 05:40:30 +00001144 else if (Literal.isUTF16())
1145 StrTy = Context.Char16Ty;
1146 else if (Literal.isUTF32())
1147 StrTy = Context.Char32Ty;
Eli Friedman64f45a22011-11-01 02:23:42 +00001148 else if (Literal.isPascal())
Anders Carlsson96b4adc2011-04-06 18:42:48 +00001149 StrTy = Context.UnsignedCharTy;
Douglas Gregor77a52232008-09-12 00:47:35 +00001150
Douglas Gregor5cee1192011-07-27 05:40:30 +00001151 StringLiteral::StringKind Kind = StringLiteral::Ascii;
1152 if (Literal.isWide())
1153 Kind = StringLiteral::Wide;
1154 else if (Literal.isUTF8())
1155 Kind = StringLiteral::UTF8;
1156 else if (Literal.isUTF16())
1157 Kind = StringLiteral::UTF16;
1158 else if (Literal.isUTF32())
1159 Kind = StringLiteral::UTF32;
1160
Douglas Gregor77a52232008-09-12 00:47:35 +00001161 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
Chris Lattner7dc480f2010-06-15 18:05:34 +00001162 if (getLangOptions().CPlusPlus || getLangOptions().ConstStrings)
Douglas Gregor77a52232008-09-12 00:47:35 +00001163 StrTy.addConst();
Sebastian Redlcd965b92009-01-18 18:53:16 +00001164
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001165 // Get an array type for the string, according to C99 6.4.5. This includes
1166 // the nul terminator character as well as the string length for pascal
1167 // strings.
1168 StrTy = Context.getConstantArrayType(StrTy,
Chris Lattnerdbb1ecc2009-02-26 23:01:51 +00001169 llvm::APInt(32, Literal.GetNumStringChars()+1),
Chris Lattnera7ad98f2008-02-11 00:02:17 +00001170 ArrayType::Normal, 0);
Mike Stump1eb44332009-09-09 15:08:12 +00001171
Reid Spencer5f016e22007-07-11 17:01:13 +00001172 // Pass &StringTokLocs[0], StringTokLocs.size() to factory!
Sean Hunt6cf75022010-08-30 17:47:05 +00001173 return Owned(StringLiteral::Create(Context, Literal.GetString(),
Douglas Gregor5cee1192011-07-27 05:40:30 +00001174 Kind, Literal.Pascal, StrTy,
Sean Hunt6cf75022010-08-30 17:47:05 +00001175 &StringTokLocs[0],
1176 StringTokLocs.size()));
Reid Spencer5f016e22007-07-11 17:01:13 +00001177}
1178
John McCall469a1eb2011-02-02 13:00:07 +00001179enum CaptureResult {
1180 /// No capture is required.
1181 CR_NoCapture,
1182
1183 /// A capture is required.
1184 CR_Capture,
1185
John McCall6b5a61b2011-02-07 10:33:21 +00001186 /// A by-ref capture is required.
1187 CR_CaptureByRef,
1188
John McCall469a1eb2011-02-02 13:00:07 +00001189 /// An error occurred when trying to capture the given variable.
1190 CR_Error
1191};
1192
1193/// Diagnose an uncapturable value reference.
Chris Lattner639e2d32008-10-20 05:16:36 +00001194///
John McCall469a1eb2011-02-02 13:00:07 +00001195/// \param var - the variable referenced
1196/// \param DC - the context which we couldn't capture through
1197static CaptureResult
John McCall6b5a61b2011-02-07 10:33:21 +00001198diagnoseUncapturableValueReference(Sema &S, SourceLocation loc,
John McCall469a1eb2011-02-02 13:00:07 +00001199 VarDecl *var, DeclContext *DC) {
1200 switch (S.ExprEvalContexts.back().Context) {
1201 case Sema::Unevaluated:
Richard Smithf6702a32011-12-20 02:08:33 +00001202 case Sema::ConstantEvaluated:
1203 // The argument will never be evaluated at runtime, so don't complain.
John McCall469a1eb2011-02-02 13:00:07 +00001204 return CR_NoCapture;
Mike Stump1eb44332009-09-09 15:08:12 +00001205
John McCall469a1eb2011-02-02 13:00:07 +00001206 case Sema::PotentiallyEvaluated:
1207 case Sema::PotentiallyEvaluatedIfUsed:
1208 break;
Chris Lattner639e2d32008-10-20 05:16:36 +00001209
John McCall469a1eb2011-02-02 13:00:07 +00001210 case Sema::PotentiallyPotentiallyEvaluated:
1211 // FIXME: delay these!
1212 break;
Chris Lattner17f3a6d2009-04-21 22:26:47 +00001213 }
Mike Stump1eb44332009-09-09 15:08:12 +00001214
John McCall469a1eb2011-02-02 13:00:07 +00001215 // Don't diagnose about capture if we're not actually in code right
1216 // now; in general, there are more appropriate places that will
1217 // diagnose this.
1218 if (!S.CurContext->isFunctionOrMethod()) return CR_NoCapture;
1219
John McCall4f38f412011-03-22 23:15:50 +00001220 // Certain madnesses can happen with parameter declarations, which
1221 // we want to ignore.
1222 if (isa<ParmVarDecl>(var)) {
1223 // - If the parameter still belongs to the translation unit, then
1224 // we're actually just using one parameter in the declaration of
1225 // the next. This is useful in e.g. VLAs.
1226 if (isa<TranslationUnitDecl>(var->getDeclContext()))
1227 return CR_NoCapture;
1228
1229 // - This particular madness can happen in ill-formed default
1230 // arguments; claim it's okay and let downstream code handle it.
1231 if (S.CurContext == var->getDeclContext()->getParent())
1232 return CR_NoCapture;
1233 }
John McCall469a1eb2011-02-02 13:00:07 +00001234
1235 DeclarationName functionName;
1236 if (FunctionDecl *fn = dyn_cast<FunctionDecl>(var->getDeclContext()))
1237 functionName = fn->getDeclName();
1238 // FIXME: variable from enclosing block that we couldn't capture from!
1239
1240 S.Diag(loc, diag::err_reference_to_local_var_in_enclosing_function)
1241 << var->getIdentifier() << functionName;
1242 S.Diag(var->getLocation(), diag::note_local_variable_declared_here)
1243 << var->getIdentifier();
1244
1245 return CR_Error;
Mike Stump1eb44332009-09-09 15:08:12 +00001246}
1247
John McCall6b5a61b2011-02-07 10:33:21 +00001248/// There is a well-formed capture at a particular scope level;
1249/// propagate it through all the nested blocks.
Richard Trieuccd891a2011-09-09 01:45:06 +00001250static CaptureResult propagateCapture(Sema &S, unsigned ValidScopeIndex,
Eli Friedmanb69b42c2012-01-11 02:36:31 +00001251 const CapturingScopeInfo::Capture &Cap) {
John McCall6b5a61b2011-02-07 10:33:21 +00001252 // Update all the inner blocks with the capture information.
Richard Trieuccd891a2011-09-09 01:45:06 +00001253 for (unsigned i = ValidScopeIndex + 1, e = S.FunctionScopes.size();
John McCall6b5a61b2011-02-07 10:33:21 +00001254 i != e; ++i) {
1255 BlockScopeInfo *innerBlock = cast<BlockScopeInfo>(S.FunctionScopes[i]);
Eli Friedmanb69b42c2012-01-11 02:36:31 +00001256 innerBlock->AddCapture(Cap.getVariable(), Cap.isReferenceCapture(),
1257 /*nested*/ true, Cap.getCopyExpr());
John McCall6b5a61b2011-02-07 10:33:21 +00001258 }
1259
Eli Friedmanb69b42c2012-01-11 02:36:31 +00001260 return Cap.isReferenceCapture() ? CR_CaptureByRef : CR_Capture;
John McCall6b5a61b2011-02-07 10:33:21 +00001261}
1262
1263/// shouldCaptureValueReference - Determine if a reference to the
John McCall469a1eb2011-02-02 13:00:07 +00001264/// given value in the current context requires a variable capture.
1265///
1266/// This also keeps the captures set in the BlockScopeInfo records
1267/// up-to-date.
John McCall6b5a61b2011-02-07 10:33:21 +00001268static CaptureResult shouldCaptureValueReference(Sema &S, SourceLocation loc,
Richard Trieuccd891a2011-09-09 01:45:06 +00001269 ValueDecl *Value) {
John McCall469a1eb2011-02-02 13:00:07 +00001270 // Only variables ever require capture.
Richard Trieuccd891a2011-09-09 01:45:06 +00001271 VarDecl *var = dyn_cast<VarDecl>(Value);
John McCall76a40212011-02-09 01:13:10 +00001272 if (!var) return CR_NoCapture;
John McCall469a1eb2011-02-02 13:00:07 +00001273
1274 // Fast path: variables from the current context never require capture.
1275 DeclContext *DC = S.CurContext;
1276 if (var->getDeclContext() == DC) return CR_NoCapture;
1277
1278 // Only variables with local storage require capture.
1279 // FIXME: What about 'const' variables in C++?
1280 if (!var->hasLocalStorage()) return CR_NoCapture;
1281
1282 // Otherwise, we need to capture.
1283
1284 unsigned functionScopesIndex = S.FunctionScopes.size() - 1;
John McCall469a1eb2011-02-02 13:00:07 +00001285 do {
1286 // Only blocks (and eventually C++0x closures) can capture; other
1287 // scopes don't work.
1288 if (!isa<BlockDecl>(DC))
John McCall6b5a61b2011-02-07 10:33:21 +00001289 return diagnoseUncapturableValueReference(S, loc, var, DC);
John McCall469a1eb2011-02-02 13:00:07 +00001290
1291 BlockScopeInfo *blockScope =
1292 cast<BlockScopeInfo>(S.FunctionScopes[functionScopesIndex]);
1293 assert(blockScope->TheDecl == static_cast<BlockDecl*>(DC));
1294
John McCall6b5a61b2011-02-07 10:33:21 +00001295 // Check whether we've already captured it in this block. If so,
1296 // we're done.
1297 if (unsigned indexPlus1 = blockScope->CaptureMap[var])
1298 return propagateCapture(S, functionScopesIndex,
1299 blockScope->Captures[indexPlus1 - 1]);
John McCall469a1eb2011-02-02 13:00:07 +00001300
1301 functionScopesIndex--;
1302 DC = cast<BlockDecl>(DC)->getDeclContext();
1303 } while (var->getDeclContext() != DC);
1304
John McCall6b5a61b2011-02-07 10:33:21 +00001305 // Okay, we descended all the way to the block that defines the variable.
1306 // Actually try to capture it.
1307 QualType type = var->getType();
Fariborz Jahanian05053212011-11-01 18:57:34 +00001308
John McCall6b5a61b2011-02-07 10:33:21 +00001309 // Prohibit variably-modified types.
1310 if (type->isVariablyModifiedType()) {
1311 S.Diag(loc, diag::err_ref_vm_type);
1312 S.Diag(var->getLocation(), diag::note_declared_at);
1313 return CR_Error;
1314 }
1315
1316 // Prohibit arrays, even in __block variables, but not references to
1317 // them.
1318 if (type->isArrayType()) {
1319 S.Diag(loc, diag::err_ref_array_type);
1320 S.Diag(var->getLocation(), diag::note_declared_at);
1321 return CR_Error;
1322 }
1323
1324 S.MarkDeclarationReferenced(loc, var);
1325
1326 // The BlocksAttr indicates the variable is bound by-reference.
1327 bool byRef = var->hasAttr<BlocksAttr>();
1328
1329 // Build a copy expression.
1330 Expr *copyExpr = 0;
John McCall642a75f2011-04-28 02:15:35 +00001331 const RecordType *rtype;
1332 if (!byRef && S.getLangOptions().CPlusPlus && !type->isDependentType() &&
1333 (rtype = type->getAs<RecordType>())) {
1334
1335 // The capture logic needs the destructor, so make sure we mark it.
1336 // Usually this is unnecessary because most local variables have
1337 // their destructors marked at declaration time, but parameters are
1338 // an exception because it's technically only the call site that
1339 // actually requires the destructor.
1340 if (isa<ParmVarDecl>(var))
1341 S.FinalizeVarWithDestructor(var, rtype);
1342
John McCall6b5a61b2011-02-07 10:33:21 +00001343 // According to the blocks spec, the capture of a variable from
1344 // the stack requires a const copy constructor. This is not true
1345 // of the copy/move done to move a __block variable to the heap.
1346 type.addConst();
1347
1348 Expr *declRef = new (S.Context) DeclRefExpr(var, type, VK_LValue, loc);
1349 ExprResult result =
1350 S.PerformCopyInitialization(
1351 InitializedEntity::InitializeBlock(var->getLocation(),
1352 type, false),
1353 loc, S.Owned(declRef));
1354
1355 // Build a full-expression copy expression if initialization
1356 // succeeded and used a non-trivial constructor. Recover from
1357 // errors by pretending that the copy isn't necessary.
1358 if (!result.isInvalid() &&
1359 !cast<CXXConstructExpr>(result.get())->getConstructor()->isTrivial()) {
1360 result = S.MaybeCreateExprWithCleanups(result);
1361 copyExpr = result.take();
1362 }
1363 }
1364
1365 // We're currently at the declarer; go back to the closure.
1366 functionScopesIndex++;
1367 BlockScopeInfo *blockScope =
1368 cast<BlockScopeInfo>(S.FunctionScopes[functionScopesIndex]);
1369
1370 // Build a valid capture in this scope.
Eli Friedmanb69b42c2012-01-11 02:36:31 +00001371 blockScope->AddCapture(var, byRef, /*nested*/ false, copyExpr);
John McCall6b5a61b2011-02-07 10:33:21 +00001372
1373 // Propagate that to inner captures if necessary.
1374 return propagateCapture(S, functionScopesIndex,
1375 blockScope->Captures.back());
1376}
1377
Richard Trieuccd891a2011-09-09 01:45:06 +00001378static ExprResult BuildBlockDeclRefExpr(Sema &S, ValueDecl *VD,
John McCall6b5a61b2011-02-07 10:33:21 +00001379 const DeclarationNameInfo &NameInfo,
Richard Trieuccd891a2011-09-09 01:45:06 +00001380 bool ByRef) {
1381 assert(isa<VarDecl>(VD) && "capturing non-variable");
John McCall6b5a61b2011-02-07 10:33:21 +00001382
Richard Trieuccd891a2011-09-09 01:45:06 +00001383 VarDecl *var = cast<VarDecl>(VD);
John McCall6b5a61b2011-02-07 10:33:21 +00001384 assert(var->hasLocalStorage() && "capturing non-local");
Richard Trieuccd891a2011-09-09 01:45:06 +00001385 assert(ByRef == var->hasAttr<BlocksAttr>() && "byref set wrong");
John McCall6b5a61b2011-02-07 10:33:21 +00001386
1387 QualType exprType = var->getType().getNonReferenceType();
1388
1389 BlockDeclRefExpr *BDRE;
Richard Trieuccd891a2011-09-09 01:45:06 +00001390 if (!ByRef) {
John McCall6b5a61b2011-02-07 10:33:21 +00001391 // The variable will be bound by copy; make it const within the
1392 // closure, but record that this was done in the expression.
1393 bool constAdded = !exprType.isConstQualified();
1394 exprType.addConst();
1395
1396 BDRE = new (S.Context) BlockDeclRefExpr(var, exprType, VK_LValue,
1397 NameInfo.getLoc(), false,
1398 constAdded);
1399 } else {
1400 BDRE = new (S.Context) BlockDeclRefExpr(var, exprType, VK_LValue,
1401 NameInfo.getLoc(), true);
1402 }
1403
1404 return S.Owned(BDRE);
John McCall469a1eb2011-02-02 13:00:07 +00001405}
Chris Lattner639e2d32008-10-20 05:16:36 +00001406
John McCall60d7b3a2010-08-24 06:29:42 +00001407ExprResult
John McCallf89e55a2010-11-18 06:31:45 +00001408Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
John McCall76a40212011-02-09 01:13:10 +00001409 SourceLocation Loc,
1410 const CXXScopeSpec *SS) {
Abramo Bagnara25777432010-08-11 22:01:17 +00001411 DeclarationNameInfo NameInfo(D->getDeclName(), Loc);
John McCallf89e55a2010-11-18 06:31:45 +00001412 return BuildDeclRefExpr(D, Ty, VK, NameInfo, SS);
Abramo Bagnara25777432010-08-11 22:01:17 +00001413}
1414
John McCall76a40212011-02-09 01:13:10 +00001415/// BuildDeclRefExpr - Build an expression that references a
1416/// declaration that does not require a closure capture.
John McCall60d7b3a2010-08-24 06:29:42 +00001417ExprResult
John McCall76a40212011-02-09 01:13:10 +00001418Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
Abramo Bagnara25777432010-08-11 22:01:17 +00001419 const DeclarationNameInfo &NameInfo,
1420 const CXXScopeSpec *SS) {
Peter Collingbourne78dd67e2011-10-02 23:49:40 +00001421 if (getLangOptions().CUDA)
1422 if (const FunctionDecl *Caller = dyn_cast<FunctionDecl>(CurContext))
1423 if (const FunctionDecl *Callee = dyn_cast<FunctionDecl>(D)) {
1424 CUDAFunctionTarget CallerTarget = IdentifyCUDATarget(Caller),
1425 CalleeTarget = IdentifyCUDATarget(Callee);
1426 if (CheckCUDATarget(CallerTarget, CalleeTarget)) {
1427 Diag(NameInfo.getLoc(), diag::err_ref_bad_target)
1428 << CalleeTarget << D->getIdentifier() << CallerTarget;
1429 Diag(D->getLocation(), diag::note_previous_decl)
1430 << D->getIdentifier();
1431 return ExprError();
1432 }
1433 }
1434
Abramo Bagnara25777432010-08-11 22:01:17 +00001435 MarkDeclarationReferenced(NameInfo.getLoc(), D);
Mike Stump1eb44332009-09-09 15:08:12 +00001436
John McCall7eb0a9e2010-11-24 05:12:34 +00001437 Expr *E = DeclRefExpr::Create(Context,
Douglas Gregor40d96a62011-02-28 21:54:11 +00001438 SS? SS->getWithLocInContext(Context)
1439 : NestedNameSpecifierLoc(),
John McCall7eb0a9e2010-11-24 05:12:34 +00001440 D, NameInfo, Ty, VK);
1441
1442 // Just in case we're building an illegal pointer-to-member.
Richard Smitha6b8b2c2011-10-10 18:28:20 +00001443 FieldDecl *FD = dyn_cast<FieldDecl>(D);
1444 if (FD && FD->isBitField())
John McCall7eb0a9e2010-11-24 05:12:34 +00001445 E->setObjectKind(OK_BitField);
1446
1447 return Owned(E);
Douglas Gregor1a49af92009-01-06 05:10:23 +00001448}
1449
Abramo Bagnara25777432010-08-11 22:01:17 +00001450/// Decomposes the given name into a DeclarationNameInfo, its location, and
John McCall129e2df2009-11-30 22:42:35 +00001451/// possibly a list of template arguments.
1452///
1453/// If this produces template arguments, it is permitted to call
1454/// DecomposeTemplateName.
1455///
1456/// This actually loses a lot of source location information for
1457/// non-standard name kinds; we should consider preserving that in
1458/// some way.
Richard Trieu67e29332011-08-02 04:35:43 +00001459void
1460Sema::DecomposeUnqualifiedId(const UnqualifiedId &Id,
1461 TemplateArgumentListInfo &Buffer,
1462 DeclarationNameInfo &NameInfo,
1463 const TemplateArgumentListInfo *&TemplateArgs) {
John McCall129e2df2009-11-30 22:42:35 +00001464 if (Id.getKind() == UnqualifiedId::IK_TemplateId) {
1465 Buffer.setLAngleLoc(Id.TemplateId->LAngleLoc);
1466 Buffer.setRAngleLoc(Id.TemplateId->RAngleLoc);
1467
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00001468 ASTTemplateArgsPtr TemplateArgsPtr(*this,
John McCall129e2df2009-11-30 22:42:35 +00001469 Id.TemplateId->getTemplateArgs(),
1470 Id.TemplateId->NumArgs);
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00001471 translateTemplateArguments(TemplateArgsPtr, Buffer);
John McCall129e2df2009-11-30 22:42:35 +00001472 TemplateArgsPtr.release();
1473
John McCall2b5289b2010-08-23 07:28:44 +00001474 TemplateName TName = Id.TemplateId->Template.get();
Abramo Bagnara25777432010-08-11 22:01:17 +00001475 SourceLocation TNameLoc = Id.TemplateId->TemplateNameLoc;
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00001476 NameInfo = Context.getNameForTemplate(TName, TNameLoc);
John McCall129e2df2009-11-30 22:42:35 +00001477 TemplateArgs = &Buffer;
1478 } else {
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00001479 NameInfo = GetNameFromUnqualifiedId(Id);
John McCall129e2df2009-11-30 22:42:35 +00001480 TemplateArgs = 0;
1481 }
1482}
1483
John McCall578b69b2009-12-16 08:11:27 +00001484/// Diagnose an empty lookup.
1485///
1486/// \return false if new lookup candidates were found
Nick Lewycky03d98c52010-07-06 19:51:49 +00001487bool Sema::DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
Kaelyn Uhrainace5e762011-08-05 00:09:52 +00001488 CorrectTypoContext CTC,
1489 TemplateArgumentListInfo *ExplicitTemplateArgs,
1490 Expr **Args, unsigned NumArgs) {
John McCall578b69b2009-12-16 08:11:27 +00001491 DeclarationName Name = R.getLookupName();
1492
John McCall578b69b2009-12-16 08:11:27 +00001493 unsigned diagnostic = diag::err_undeclared_var_use;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001494 unsigned diagnostic_suggest = diag::err_undeclared_var_use_suggest;
John McCall578b69b2009-12-16 08:11:27 +00001495 if (Name.getNameKind() == DeclarationName::CXXOperatorName ||
1496 Name.getNameKind() == DeclarationName::CXXLiteralOperatorName ||
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001497 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
John McCall578b69b2009-12-16 08:11:27 +00001498 diagnostic = diag::err_undeclared_use;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001499 diagnostic_suggest = diag::err_undeclared_use_suggest;
1500 }
John McCall578b69b2009-12-16 08:11:27 +00001501
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001502 // If the original lookup was an unqualified lookup, fake an
1503 // unqualified lookup. This is useful when (for example) the
1504 // original lookup would not have found something because it was a
1505 // dependent name.
Francois Pichetc8ff9152011-11-25 01:10:54 +00001506 DeclContext *DC = SS.isEmpty() ? CurContext : 0;
1507 while (DC) {
John McCall578b69b2009-12-16 08:11:27 +00001508 if (isa<CXXRecordDecl>(DC)) {
1509 LookupQualifiedName(R, DC);
1510
1511 if (!R.empty()) {
1512 // Don't give errors about ambiguities in this lookup.
1513 R.suppressDiagnostics();
1514
Francois Pichete6226ae2011-11-17 03:44:24 +00001515 // During a default argument instantiation the CurContext points
1516 // to a CXXMethodDecl; but we can't apply a this-> fixit inside a
1517 // function parameter list, hence add an explicit check.
1518 bool isDefaultArgument = !ActiveTemplateInstantiations.empty() &&
1519 ActiveTemplateInstantiations.back().Kind ==
1520 ActiveTemplateInstantiation::DefaultFunctionArgumentInstantiation;
John McCall578b69b2009-12-16 08:11:27 +00001521 CXXMethodDecl *CurMethod = dyn_cast<CXXMethodDecl>(CurContext);
1522 bool isInstance = CurMethod &&
1523 CurMethod->isInstance() &&
Francois Pichete6226ae2011-11-17 03:44:24 +00001524 DC == CurMethod->getParent() && !isDefaultArgument;
1525
John McCall578b69b2009-12-16 08:11:27 +00001526
1527 // Give a code modification hint to insert 'this->'.
1528 // TODO: fixit for inserting 'Base<T>::' in the other cases.
1529 // Actually quite difficult!
Nick Lewycky03d98c52010-07-06 19:51:49 +00001530 if (isInstance) {
Nick Lewycky03d98c52010-07-06 19:51:49 +00001531 UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(
1532 CallsUndergoingInstantiation.back()->getCallee());
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001533 CXXMethodDecl *DepMethod = cast_or_null<CXXMethodDecl>(
Nick Lewycky03d98c52010-07-06 19:51:49 +00001534 CurMethod->getInstantiatedFromMemberFunction());
Eli Friedmana7e68452010-08-22 01:00:03 +00001535 if (DepMethod) {
Francois Pichete614d6c2011-11-15 23:33:34 +00001536 if (getLangOptions().MicrosoftMode)
Francois Pichet0f74d1e2011-09-07 00:14:57 +00001537 diagnostic = diag::warn_found_via_dependent_bases_lookup;
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001538 Diag(R.getNameLoc(), diagnostic) << Name
1539 << FixItHint::CreateInsertion(R.getNameLoc(), "this->");
1540 QualType DepThisType = DepMethod->getThisType(Context);
Eli Friedman72899c32012-01-07 04:59:52 +00001541 CheckCXXThisCapture(R.getNameLoc());
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001542 CXXThisExpr *DepThis = new (Context) CXXThisExpr(
1543 R.getNameLoc(), DepThisType, false);
1544 TemplateArgumentListInfo TList;
1545 if (ULE->hasExplicitTemplateArgs())
1546 ULE->copyTemplateArgumentsInto(TList);
Douglas Gregor7c3179c2011-02-28 18:50:33 +00001547
Douglas Gregor7c3179c2011-02-28 18:50:33 +00001548 CXXScopeSpec SS;
Douglas Gregor4c9be892011-02-28 20:01:57 +00001549 SS.Adopt(ULE->getQualifierLoc());
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001550 CXXDependentScopeMemberExpr *DepExpr =
1551 CXXDependentScopeMemberExpr::Create(
1552 Context, DepThis, DepThisType, true, SourceLocation(),
Douglas Gregor7c3179c2011-02-28 18:50:33 +00001553 SS.getWithLocInContext(Context), NULL,
Francois Pichetf7400122011-09-04 23:00:48 +00001554 R.getLookupNameInfo(),
1555 ULE->hasExplicitTemplateArgs() ? &TList : 0);
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001556 CallsUndergoingInstantiation.back()->setCallee(DepExpr);
Eli Friedmana7e68452010-08-22 01:00:03 +00001557 } else {
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001558 // FIXME: we should be able to handle this case too. It is correct
1559 // to add this-> here. This is a workaround for PR7947.
1560 Diag(R.getNameLoc(), diagnostic) << Name;
Eli Friedmana7e68452010-08-22 01:00:03 +00001561 }
Nick Lewycky03d98c52010-07-06 19:51:49 +00001562 } else {
Francois Pichete614d6c2011-11-15 23:33:34 +00001563 if (getLangOptions().MicrosoftMode)
1564 diagnostic = diag::warn_found_via_dependent_bases_lookup;
John McCall578b69b2009-12-16 08:11:27 +00001565 Diag(R.getNameLoc(), diagnostic) << Name;
Nick Lewycky03d98c52010-07-06 19:51:49 +00001566 }
John McCall578b69b2009-12-16 08:11:27 +00001567
1568 // Do we really want to note all of these?
1569 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
1570 Diag((*I)->getLocation(), diag::note_dependent_var_use);
1571
Francois Pichete6226ae2011-11-17 03:44:24 +00001572 // Return true if we are inside a default argument instantiation
1573 // and the found name refers to an instance member function, otherwise
1574 // the function calling DiagnoseEmptyLookup will try to create an
1575 // implicit member call and this is wrong for default argument.
1576 if (isDefaultArgument && ((*R.begin())->isCXXInstanceMember())) {
1577 Diag(R.getNameLoc(), diag::err_member_call_without_object);
1578 return true;
1579 }
1580
John McCall578b69b2009-12-16 08:11:27 +00001581 // Tell the callee to try to recover.
1582 return false;
1583 }
Douglas Gregore26f0432010-08-09 22:38:14 +00001584
1585 R.clear();
John McCall578b69b2009-12-16 08:11:27 +00001586 }
Francois Pichetc8ff9152011-11-25 01:10:54 +00001587
1588 // In Microsoft mode, if we are performing lookup from within a friend
1589 // function definition declared at class scope then we must set
1590 // DC to the lexical parent to be able to search into the parent
1591 // class.
Lang Hames36ef7022011-11-29 22:37:13 +00001592 if (getLangOptions().MicrosoftMode && isa<FunctionDecl>(DC) &&
Francois Pichetc8ff9152011-11-25 01:10:54 +00001593 cast<FunctionDecl>(DC)->getFriendObjectKind() &&
1594 DC->getLexicalParent()->isRecord())
1595 DC = DC->getLexicalParent();
1596 else
1597 DC = DC->getParent();
John McCall578b69b2009-12-16 08:11:27 +00001598 }
1599
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001600 // We didn't find anything, so try to correct for a typo.
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001601 TypoCorrection Corrected;
1602 if (S && (Corrected = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(),
1603 S, &SS, NULL, false, CTC))) {
1604 std::string CorrectedStr(Corrected.getAsString(getLangOptions()));
1605 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions()));
1606 R.setLookupName(Corrected.getCorrection());
1607
Hans Wennborg701d1e72011-07-12 08:45:31 +00001608 if (NamedDecl *ND = Corrected.getCorrectionDecl()) {
Kaelyn Uhrainf0c1d8f2011-08-03 20:36:05 +00001609 if (Corrected.isOverloaded()) {
1610 OverloadCandidateSet OCS(R.getNameLoc());
1611 OverloadCandidateSet::iterator Best;
1612 for (TypoCorrection::decl_iterator CD = Corrected.begin(),
1613 CDEnd = Corrected.end();
1614 CD != CDEnd; ++CD) {
Kaelyn Uhrainadc7a732011-08-08 17:35:31 +00001615 if (FunctionTemplateDecl *FTD =
Kaelyn Uhrainace5e762011-08-05 00:09:52 +00001616 dyn_cast<FunctionTemplateDecl>(*CD))
1617 AddTemplateOverloadCandidate(
1618 FTD, DeclAccessPair::make(FTD, AS_none), ExplicitTemplateArgs,
1619 Args, NumArgs, OCS);
Kaelyn Uhrainadc7a732011-08-08 17:35:31 +00001620 else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*CD))
1621 if (!ExplicitTemplateArgs || ExplicitTemplateArgs->size() == 0)
1622 AddOverloadCandidate(FD, DeclAccessPair::make(FD, AS_none),
1623 Args, NumArgs, OCS);
Kaelyn Uhrainf0c1d8f2011-08-03 20:36:05 +00001624 }
1625 switch (OCS.BestViableFunction(*this, R.getNameLoc(), Best)) {
1626 case OR_Success:
1627 ND = Best->Function;
1628 break;
1629 default:
Kaelyn Uhrain844d5722011-08-04 23:30:54 +00001630 break;
Kaelyn Uhrainf0c1d8f2011-08-03 20:36:05 +00001631 }
1632 }
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001633 R.addDecl(ND);
1634 if (isa<ValueDecl>(ND) || isa<FunctionTemplateDecl>(ND)) {
Douglas Gregoraaf87162010-04-14 20:04:41 +00001635 if (SS.isEmpty())
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001636 Diag(R.getNameLoc(), diagnostic_suggest) << Name << CorrectedQuotedStr
1637 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr);
Douglas Gregoraaf87162010-04-14 20:04:41 +00001638 else
1639 Diag(R.getNameLoc(), diag::err_no_member_suggest)
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001640 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
Douglas Gregoraaf87162010-04-14 20:04:41 +00001641 << SS.getRange()
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001642 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr);
1643 if (ND)
Douglas Gregoraaf87162010-04-14 20:04:41 +00001644 Diag(ND->getLocation(), diag::note_previous_decl)
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001645 << CorrectedQuotedStr;
Douglas Gregoraaf87162010-04-14 20:04:41 +00001646
1647 // Tell the callee to try to recover.
1648 return false;
1649 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001650
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001651 if (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND)) {
Douglas Gregoraaf87162010-04-14 20:04:41 +00001652 // FIXME: If we ended up with a typo for a type name or
1653 // Objective-C class name, we're in trouble because the parser
1654 // is in the wrong place to recover. Suggest the typo
1655 // correction, but don't make it a fix-it since we're not going
1656 // to recover well anyway.
1657 if (SS.isEmpty())
Richard Trieu67e29332011-08-02 04:35:43 +00001658 Diag(R.getNameLoc(), diagnostic_suggest)
1659 << Name << CorrectedQuotedStr;
Douglas Gregoraaf87162010-04-14 20:04:41 +00001660 else
1661 Diag(R.getNameLoc(), diag::err_no_member_suggest)
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001662 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
Douglas Gregoraaf87162010-04-14 20:04:41 +00001663 << SS.getRange();
1664
1665 // Don't try to recover; it won't work.
1666 return true;
1667 }
1668 } else {
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001669 // FIXME: We found a keyword. Suggest it, but don't provide a fix-it
Douglas Gregoraaf87162010-04-14 20:04:41 +00001670 // because we aren't able to recover.
Douglas Gregord203a162010-01-01 00:15:04 +00001671 if (SS.isEmpty())
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001672 Diag(R.getNameLoc(), diagnostic_suggest) << Name << CorrectedQuotedStr;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001673 else
Douglas Gregord203a162010-01-01 00:15:04 +00001674 Diag(R.getNameLoc(), diag::err_no_member_suggest)
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001675 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
Douglas Gregoraaf87162010-04-14 20:04:41 +00001676 << SS.getRange();
Douglas Gregord203a162010-01-01 00:15:04 +00001677 return true;
1678 }
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001679 }
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001680 R.clear();
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001681
1682 // Emit a special diagnostic for failed member lookups.
1683 // FIXME: computing the declaration context might fail here (?)
1684 if (!SS.isEmpty()) {
1685 Diag(R.getNameLoc(), diag::err_no_member)
1686 << Name << computeDeclContext(SS, false)
1687 << SS.getRange();
1688 return true;
1689 }
1690
John McCall578b69b2009-12-16 08:11:27 +00001691 // Give up, we can't recover.
1692 Diag(R.getNameLoc(), diagnostic) << Name;
1693 return true;
1694}
1695
John McCall60d7b3a2010-08-24 06:29:42 +00001696ExprResult Sema::ActOnIdExpression(Scope *S,
John McCallfb97e752010-08-24 22:52:39 +00001697 CXXScopeSpec &SS,
1698 UnqualifiedId &Id,
1699 bool HasTrailingLParen,
Richard Trieuccd891a2011-09-09 01:45:06 +00001700 bool IsAddressOfOperand) {
1701 assert(!(IsAddressOfOperand && HasTrailingLParen) &&
John McCallf7a1a742009-11-24 19:00:30 +00001702 "cannot be direct & operand and have a trailing lparen");
1703
1704 if (SS.isInvalid())
Douglas Gregor4c921ae2009-01-30 01:04:22 +00001705 return ExprError();
Douglas Gregor5953d8b2009-03-19 17:26:29 +00001706
John McCall129e2df2009-11-30 22:42:35 +00001707 TemplateArgumentListInfo TemplateArgsBuffer;
John McCallf7a1a742009-11-24 19:00:30 +00001708
1709 // Decompose the UnqualifiedId into the following data.
Abramo Bagnara25777432010-08-11 22:01:17 +00001710 DeclarationNameInfo NameInfo;
John McCallf7a1a742009-11-24 19:00:30 +00001711 const TemplateArgumentListInfo *TemplateArgs;
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00001712 DecomposeUnqualifiedId(Id, TemplateArgsBuffer, NameInfo, TemplateArgs);
Douglas Gregor5953d8b2009-03-19 17:26:29 +00001713
Abramo Bagnara25777432010-08-11 22:01:17 +00001714 DeclarationName Name = NameInfo.getName();
Douglas Gregor10c42622008-11-18 15:03:34 +00001715 IdentifierInfo *II = Name.getAsIdentifierInfo();
Abramo Bagnara25777432010-08-11 22:01:17 +00001716 SourceLocation NameLoc = NameInfo.getLoc();
John McCallba135432009-11-21 08:51:07 +00001717
John McCallf7a1a742009-11-24 19:00:30 +00001718 // C++ [temp.dep.expr]p3:
1719 // An id-expression is type-dependent if it contains:
Douglas Gregor48026d22010-01-11 18:40:55 +00001720 // -- an identifier that was declared with a dependent type,
1721 // (note: handled after lookup)
1722 // -- a template-id that is dependent,
1723 // (note: handled in BuildTemplateIdExpr)
1724 // -- a conversion-function-id that specifies a dependent type,
John McCallf7a1a742009-11-24 19:00:30 +00001725 // -- a nested-name-specifier that contains a class-name that
1726 // names a dependent type.
1727 // Determine whether this is a member of an unknown specialization;
1728 // we need to handle these differently.
Eli Friedman647c8b32010-08-06 23:41:47 +00001729 bool DependentID = false;
1730 if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName &&
1731 Name.getCXXNameType()->isDependentType()) {
1732 DependentID = true;
1733 } else if (SS.isSet()) {
Chris Lattner337e5502011-02-18 01:27:55 +00001734 if (DeclContext *DC = computeDeclContext(SS, false)) {
Eli Friedman647c8b32010-08-06 23:41:47 +00001735 if (RequireCompleteDeclContext(SS, DC))
1736 return ExprError();
Eli Friedman647c8b32010-08-06 23:41:47 +00001737 } else {
1738 DependentID = true;
1739 }
1740 }
1741
Chris Lattner337e5502011-02-18 01:27:55 +00001742 if (DependentID)
Richard Trieuccd891a2011-09-09 01:45:06 +00001743 return ActOnDependentIdExpression(SS, NameInfo, IsAddressOfOperand,
John McCallf7a1a742009-11-24 19:00:30 +00001744 TemplateArgs);
Chris Lattner337e5502011-02-18 01:27:55 +00001745
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001746 bool IvarLookupFollowUp = false;
John McCallf7a1a742009-11-24 19:00:30 +00001747 // Perform the required lookup.
Fariborz Jahanian98a54032011-07-12 17:16:56 +00001748 LookupResult R(*this, NameInfo,
1749 (Id.getKind() == UnqualifiedId::IK_ImplicitSelfParam)
1750 ? LookupObjCImplicitSelfParam : LookupOrdinaryName);
John McCallf7a1a742009-11-24 19:00:30 +00001751 if (TemplateArgs) {
Douglas Gregord2235f62010-05-20 20:58:56 +00001752 // Lookup the template name again to correctly establish the context in
1753 // which it was found. This is really unfortunate as we already did the
1754 // lookup to determine that it was a template name in the first place. If
1755 // this becomes a performance hit, we can work harder to preserve those
1756 // results until we get here but it's likely not worth it.
Douglas Gregor1fd6d442010-05-21 23:18:07 +00001757 bool MemberOfUnknownSpecialization;
1758 LookupTemplateName(R, S, SS, QualType(), /*EnteringContext=*/false,
1759 MemberOfUnknownSpecialization);
Douglas Gregor2f9f89c2011-02-04 13:35:07 +00001760
1761 if (MemberOfUnknownSpecialization ||
1762 (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation))
Richard Trieuccd891a2011-09-09 01:45:06 +00001763 return ActOnDependentIdExpression(SS, NameInfo, IsAddressOfOperand,
Douglas Gregor2f9f89c2011-02-04 13:35:07 +00001764 TemplateArgs);
John McCallf7a1a742009-11-24 19:00:30 +00001765 } else {
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001766 IvarLookupFollowUp = (!SS.isSet() && II && getCurMethodDecl());
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00001767 LookupParsedName(R, S, &SS, !IvarLookupFollowUp);
Mike Stump1eb44332009-09-09 15:08:12 +00001768
Douglas Gregor2f9f89c2011-02-04 13:35:07 +00001769 // If the result might be in a dependent base class, this is a dependent
1770 // id-expression.
1771 if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)
Richard Trieuccd891a2011-09-09 01:45:06 +00001772 return ActOnDependentIdExpression(SS, NameInfo, IsAddressOfOperand,
Douglas Gregor2f9f89c2011-02-04 13:35:07 +00001773 TemplateArgs);
1774
John McCallf7a1a742009-11-24 19:00:30 +00001775 // If this reference is in an Objective-C method, then we need to do
1776 // some special Objective-C lookup, too.
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00001777 if (IvarLookupFollowUp) {
John McCall60d7b3a2010-08-24 06:29:42 +00001778 ExprResult E(LookupInObjCMethod(R, S, II, true));
John McCallf7a1a742009-11-24 19:00:30 +00001779 if (E.isInvalid())
1780 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00001781
Chris Lattner337e5502011-02-18 01:27:55 +00001782 if (Expr *Ex = E.takeAs<Expr>())
1783 return Owned(Ex);
1784
Fariborz Jahanianf759b4d2010-08-13 18:09:39 +00001785 // for further use, this must be set to false if in class method.
1786 IvarLookupFollowUp = getCurMethodDecl()->isInstanceMethod();
Steve Naroffe3e9add2008-06-02 23:03:37 +00001787 }
Chris Lattner8a934232008-03-31 00:36:02 +00001788 }
Douglas Gregorc71e28c2009-02-16 19:28:42 +00001789
John McCallf7a1a742009-11-24 19:00:30 +00001790 if (R.isAmbiguous())
1791 return ExprError();
1792
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001793 // Determine whether this name might be a candidate for
1794 // argument-dependent lookup.
John McCallf7a1a742009-11-24 19:00:30 +00001795 bool ADL = UseArgumentDependentLookup(SS, R, HasTrailingLParen);
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001796
John McCallf7a1a742009-11-24 19:00:30 +00001797 if (R.empty() && !ADL) {
Reid Spencer5f016e22007-07-11 17:01:13 +00001798 // Otherwise, this could be an implicitly declared function reference (legal
John McCallf7a1a742009-11-24 19:00:30 +00001799 // in C90, extension in C99, forbidden in C++).
1800 if (HasTrailingLParen && II && !getLangOptions().CPlusPlus) {
1801 NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *II, S);
1802 if (D) R.addDecl(D);
1803 }
1804
1805 // If this name wasn't predeclared and if this is not a function
1806 // call, diagnose the problem.
1807 if (R.empty()) {
Francois Pichetfce1a3a2011-09-24 10:38:05 +00001808
1809 // In Microsoft mode, if we are inside a template class member function
1810 // and we can't resolve an identifier then assume the identifier is type
1811 // dependent. The goal is to postpone name lookup to instantiation time
1812 // to be able to search into type dependent base classes.
1813 if (getLangOptions().MicrosoftMode && CurContext->isDependentContext() &&
1814 isa<CXXMethodDecl>(CurContext))
1815 return ActOnDependentIdExpression(SS, NameInfo, IsAddressOfOperand,
1816 TemplateArgs);
1817
Douglas Gregor91f7ac72010-05-18 16:14:23 +00001818 if (DiagnoseEmptyLookup(S, SS, R, CTC_Unknown))
John McCall578b69b2009-12-16 08:11:27 +00001819 return ExprError();
1820
1821 assert(!R.empty() &&
1822 "DiagnoseEmptyLookup returned false but added no results");
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001823
1824 // If we found an Objective-C instance variable, let
1825 // LookupInObjCMethod build the appropriate expression to
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001826 // reference the ivar.
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001827 if (ObjCIvarDecl *Ivar = R.getAsSingle<ObjCIvarDecl>()) {
1828 R.clear();
John McCall60d7b3a2010-08-24 06:29:42 +00001829 ExprResult E(LookupInObjCMethod(R, S, Ivar->getIdentifier()));
Fariborz Jahanianbc2b91a2011-09-23 23:11:38 +00001830 // In a hopelessly buggy code, Objective-C instance variable
1831 // lookup fails and no expression will be built to reference it.
1832 if (!E.isInvalid() && !E.get())
1833 return ExprError();
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001834 return move(E);
1835 }
Reid Spencer5f016e22007-07-11 17:01:13 +00001836 }
1837 }
Mike Stump1eb44332009-09-09 15:08:12 +00001838
John McCallf7a1a742009-11-24 19:00:30 +00001839 // This is guaranteed from this point on.
1840 assert(!R.empty() || ADL);
1841
John McCallaa81e162009-12-01 22:10:20 +00001842 // Check whether this might be a C++ implicit instance member access.
John McCallfb97e752010-08-24 22:52:39 +00001843 // C++ [class.mfct.non-static]p3:
1844 // When an id-expression that is not part of a class member access
1845 // syntax and not used to form a pointer to member is used in the
1846 // body of a non-static member function of class X, if name lookup
1847 // resolves the name in the id-expression to a non-static non-type
1848 // member of some class C, the id-expression is transformed into a
1849 // class member access expression using (*this) as the
1850 // postfix-expression to the left of the . operator.
John McCall9c72c602010-08-27 09:08:28 +00001851 //
1852 // But we don't actually need to do this for '&' operands if R
1853 // resolved to a function or overloaded function set, because the
1854 // expression is ill-formed if it actually works out to be a
1855 // non-static member function:
1856 //
1857 // C++ [expr.ref]p4:
1858 // Otherwise, if E1.E2 refers to a non-static member function. . .
1859 // [t]he expression can be used only as the left-hand operand of a
1860 // member function call.
1861 //
1862 // There are other safeguards against such uses, but it's important
1863 // to get this right here so that we don't end up making a
1864 // spuriously dependent expression if we're inside a dependent
1865 // instance method.
John McCall3b4294e2009-12-16 12:17:52 +00001866 if (!R.empty() && (*R.begin())->isCXXClassMember()) {
John McCall9c72c602010-08-27 09:08:28 +00001867 bool MightBeImplicitMember;
Richard Trieuccd891a2011-09-09 01:45:06 +00001868 if (!IsAddressOfOperand)
John McCall9c72c602010-08-27 09:08:28 +00001869 MightBeImplicitMember = true;
1870 else if (!SS.isEmpty())
1871 MightBeImplicitMember = false;
1872 else if (R.isOverloadedResult())
1873 MightBeImplicitMember = false;
Douglas Gregore2248be2010-08-30 16:00:47 +00001874 else if (R.isUnresolvableResult())
1875 MightBeImplicitMember = true;
John McCall9c72c602010-08-27 09:08:28 +00001876 else
Francois Pichet87c2e122010-11-21 06:08:52 +00001877 MightBeImplicitMember = isa<FieldDecl>(R.getFoundDecl()) ||
1878 isa<IndirectFieldDecl>(R.getFoundDecl());
John McCall9c72c602010-08-27 09:08:28 +00001879
1880 if (MightBeImplicitMember)
John McCall3b4294e2009-12-16 12:17:52 +00001881 return BuildPossibleImplicitMemberExpr(SS, R, TemplateArgs);
John McCall5b3f9132009-11-22 01:44:31 +00001882 }
1883
John McCallf7a1a742009-11-24 19:00:30 +00001884 if (TemplateArgs)
1885 return BuildTemplateIdExpr(SS, R, ADL, *TemplateArgs);
John McCall5b3f9132009-11-22 01:44:31 +00001886
John McCallf7a1a742009-11-24 19:00:30 +00001887 return BuildDeclarationNameExpr(SS, R, ADL);
1888}
1889
John McCall129e2df2009-11-30 22:42:35 +00001890/// BuildQualifiedDeclarationNameExpr - Build a C++ qualified
1891/// declaration name, generally during template instantiation.
1892/// There's a large number of things which don't need to be done along
1893/// this path.
John McCall60d7b3a2010-08-24 06:29:42 +00001894ExprResult
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00001895Sema::BuildQualifiedDeclarationNameExpr(CXXScopeSpec &SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00001896 const DeclarationNameInfo &NameInfo) {
John McCallf7a1a742009-11-24 19:00:30 +00001897 DeclContext *DC;
Douglas Gregore6ec5c42010-04-28 07:04:26 +00001898 if (!(DC = computeDeclContext(SS, false)) || DC->isDependentContext())
Abramo Bagnara25777432010-08-11 22:01:17 +00001899 return BuildDependentDeclRefExpr(SS, NameInfo, 0);
John McCallf7a1a742009-11-24 19:00:30 +00001900
John McCall77bb1aa2010-05-01 00:40:08 +00001901 if (RequireCompleteDeclContext(SS, DC))
Douglas Gregore6ec5c42010-04-28 07:04:26 +00001902 return ExprError();
1903
Abramo Bagnara25777432010-08-11 22:01:17 +00001904 LookupResult R(*this, NameInfo, LookupOrdinaryName);
John McCallf7a1a742009-11-24 19:00:30 +00001905 LookupQualifiedName(R, DC);
1906
1907 if (R.isAmbiguous())
1908 return ExprError();
1909
1910 if (R.empty()) {
Abramo Bagnara25777432010-08-11 22:01:17 +00001911 Diag(NameInfo.getLoc(), diag::err_no_member)
1912 << NameInfo.getName() << DC << SS.getRange();
John McCallf7a1a742009-11-24 19:00:30 +00001913 return ExprError();
1914 }
1915
1916 return BuildDeclarationNameExpr(SS, R, /*ADL*/ false);
1917}
1918
1919/// LookupInObjCMethod - The parser has read a name in, and Sema has
1920/// detected that we're currently inside an ObjC method. Perform some
1921/// additional lookup.
1922///
1923/// Ideally, most of this would be done by lookup, but there's
1924/// actually quite a lot of extra work involved.
1925///
1926/// Returns a null sentinel to indicate trivial success.
John McCall60d7b3a2010-08-24 06:29:42 +00001927ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00001928Sema::LookupInObjCMethod(LookupResult &Lookup, Scope *S,
Chris Lattnereb483eb2010-04-11 08:28:14 +00001929 IdentifierInfo *II, bool AllowBuiltinCreation) {
John McCallf7a1a742009-11-24 19:00:30 +00001930 SourceLocation Loc = Lookup.getNameLoc();
Chris Lattneraec43db2010-04-12 05:10:17 +00001931 ObjCMethodDecl *CurMethod = getCurMethodDecl();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001932
John McCallf7a1a742009-11-24 19:00:30 +00001933 // There are two cases to handle here. 1) scoped lookup could have failed,
1934 // in which case we should look for an ivar. 2) scoped lookup could have
1935 // found a decl, but that decl is outside the current instance method (i.e.
1936 // a global variable). In these two cases, we do a lookup for an ivar with
1937 // this name, if the lookup sucedes, we replace it our current decl.
1938
1939 // If we're in a class method, we don't normally want to look for
1940 // ivars. But if we don't find anything else, and there's an
1941 // ivar, that's an error.
Chris Lattneraec43db2010-04-12 05:10:17 +00001942 bool IsClassMethod = CurMethod->isClassMethod();
John McCallf7a1a742009-11-24 19:00:30 +00001943
1944 bool LookForIvars;
1945 if (Lookup.empty())
1946 LookForIvars = true;
1947 else if (IsClassMethod)
1948 LookForIvars = false;
1949 else
1950 LookForIvars = (Lookup.isSingleResult() &&
1951 Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod());
Fariborz Jahanian412e7982010-02-09 19:31:38 +00001952 ObjCInterfaceDecl *IFace = 0;
John McCallf7a1a742009-11-24 19:00:30 +00001953 if (LookForIvars) {
Chris Lattneraec43db2010-04-12 05:10:17 +00001954 IFace = CurMethod->getClassInterface();
John McCallf7a1a742009-11-24 19:00:30 +00001955 ObjCInterfaceDecl *ClassDeclared;
Argyrios Kyrtzidis7c81c2a2011-10-19 02:25:16 +00001956 ObjCIvarDecl *IV = 0;
1957 if (IFace && (IV = IFace->lookupInstanceVariable(II, ClassDeclared))) {
John McCallf7a1a742009-11-24 19:00:30 +00001958 // Diagnose using an ivar in a class method.
1959 if (IsClassMethod)
1960 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method)
1961 << IV->getDeclName());
1962
1963 // If we're referencing an invalid decl, just return this as a silent
1964 // error node. The error diagnostic was already emitted on the decl.
1965 if (IV->isInvalidDecl())
1966 return ExprError();
1967
1968 // Check if referencing a field with __attribute__((deprecated)).
1969 if (DiagnoseUseOfDecl(IV, Loc))
1970 return ExprError();
1971
1972 // Diagnose the use of an ivar outside of the declaring class.
1973 if (IV->getAccessControl() == ObjCIvarDecl::Private &&
Douglas Gregor60ef3082011-12-15 00:29:59 +00001974 !declaresSameEntity(ClassDeclared, IFace))
John McCallf7a1a742009-11-24 19:00:30 +00001975 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName();
1976
1977 // FIXME: This should use a new expr for a direct reference, don't
1978 // turn this into Self->ivar, just return a BareIVarExpr or something.
1979 IdentifierInfo &II = Context.Idents.get("self");
1980 UnqualifiedId SelfName;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001981 SelfName.setIdentifier(&II, SourceLocation());
Fariborz Jahanian98a54032011-07-12 17:16:56 +00001982 SelfName.setKind(UnqualifiedId::IK_ImplicitSelfParam);
John McCallf7a1a742009-11-24 19:00:30 +00001983 CXXScopeSpec SelfScopeSpec;
John McCall60d7b3a2010-08-24 06:29:42 +00001984 ExprResult SelfExpr = ActOnIdExpression(S, SelfScopeSpec,
Douglas Gregore45bb6a2010-09-22 16:33:13 +00001985 SelfName, false, false);
1986 if (SelfExpr.isInvalid())
1987 return ExprError();
1988
John Wiegley429bb272011-04-08 18:41:53 +00001989 SelfExpr = DefaultLvalueConversion(SelfExpr.take());
1990 if (SelfExpr.isInvalid())
1991 return ExprError();
John McCall409fa9a2010-12-06 20:48:59 +00001992
John McCallf7a1a742009-11-24 19:00:30 +00001993 MarkDeclarationReferenced(Loc, IV);
1994 return Owned(new (Context)
1995 ObjCIvarRefExpr(IV, IV->getType(), Loc,
John Wiegley429bb272011-04-08 18:41:53 +00001996 SelfExpr.take(), true, true));
John McCallf7a1a742009-11-24 19:00:30 +00001997 }
Chris Lattneraec43db2010-04-12 05:10:17 +00001998 } else if (CurMethod->isInstanceMethod()) {
John McCallf7a1a742009-11-24 19:00:30 +00001999 // We should warn if a local variable hides an ivar.
Fariborz Jahanian90f7b622011-11-08 22:51:27 +00002000 if (ObjCInterfaceDecl *IFace = CurMethod->getClassInterface()) {
2001 ObjCInterfaceDecl *ClassDeclared;
2002 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
2003 if (IV->getAccessControl() != ObjCIvarDecl::Private ||
Douglas Gregor60ef3082011-12-15 00:29:59 +00002004 declaresSameEntity(IFace, ClassDeclared))
Fariborz Jahanian90f7b622011-11-08 22:51:27 +00002005 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName();
2006 }
John McCallf7a1a742009-11-24 19:00:30 +00002007 }
Fariborz Jahanianb5ea9db2011-12-20 22:21:08 +00002008 } else if (Lookup.isSingleResult() &&
2009 Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod()) {
2010 // If accessing a stand-alone ivar in a class method, this is an error.
2011 if (const ObjCIvarDecl *IV = dyn_cast<ObjCIvarDecl>(Lookup.getFoundDecl()))
2012 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method)
2013 << IV->getDeclName());
John McCallf7a1a742009-11-24 19:00:30 +00002014 }
2015
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00002016 if (Lookup.empty() && II && AllowBuiltinCreation) {
2017 // FIXME. Consolidate this with similar code in LookupName.
2018 if (unsigned BuiltinID = II->getBuiltinID()) {
2019 if (!(getLangOptions().CPlusPlus &&
2020 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))) {
2021 NamedDecl *D = LazilyCreateBuiltin((IdentifierInfo *)II, BuiltinID,
2022 S, Lookup.isForRedeclaration(),
2023 Lookup.getNameLoc());
2024 if (D) Lookup.addDecl(D);
2025 }
2026 }
2027 }
John McCallf7a1a742009-11-24 19:00:30 +00002028 // Sentinel value saying that we didn't do anything special.
2029 return Owned((Expr*) 0);
Douglas Gregor751f9a42009-06-30 15:47:41 +00002030}
John McCallba135432009-11-21 08:51:07 +00002031
John McCall6bb80172010-03-30 21:47:33 +00002032/// \brief Cast a base object to a member's actual type.
2033///
2034/// Logically this happens in three phases:
2035///
2036/// * First we cast from the base type to the naming class.
2037/// The naming class is the class into which we were looking
2038/// when we found the member; it's the qualifier type if a
2039/// qualifier was provided, and otherwise it's the base type.
2040///
2041/// * Next we cast from the naming class to the declaring class.
2042/// If the member we found was brought into a class's scope by
2043/// a using declaration, this is that class; otherwise it's
2044/// the class declaring the member.
2045///
2046/// * Finally we cast from the declaring class to the "true"
2047/// declaring class of the member. This conversion does not
2048/// obey access control.
John Wiegley429bb272011-04-08 18:41:53 +00002049ExprResult
2050Sema::PerformObjectMemberConversion(Expr *From,
Douglas Gregor5fccd362010-03-03 23:55:11 +00002051 NestedNameSpecifier *Qualifier,
John McCall6bb80172010-03-30 21:47:33 +00002052 NamedDecl *FoundDecl,
Douglas Gregor5fccd362010-03-03 23:55:11 +00002053 NamedDecl *Member) {
2054 CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Member->getDeclContext());
2055 if (!RD)
John Wiegley429bb272011-04-08 18:41:53 +00002056 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002057
Douglas Gregor5fccd362010-03-03 23:55:11 +00002058 QualType DestRecordType;
2059 QualType DestType;
2060 QualType FromRecordType;
2061 QualType FromType = From->getType();
2062 bool PointerConversions = false;
2063 if (isa<FieldDecl>(Member)) {
2064 DestRecordType = Context.getCanonicalType(Context.getTypeDeclType(RD));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002065
Douglas Gregor5fccd362010-03-03 23:55:11 +00002066 if (FromType->getAs<PointerType>()) {
2067 DestType = Context.getPointerType(DestRecordType);
2068 FromRecordType = FromType->getPointeeType();
2069 PointerConversions = true;
2070 } else {
2071 DestType = DestRecordType;
2072 FromRecordType = FromType;
Fariborz Jahanian98a541e2009-07-29 18:40:24 +00002073 }
Douglas Gregor5fccd362010-03-03 23:55:11 +00002074 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) {
2075 if (Method->isStatic())
John Wiegley429bb272011-04-08 18:41:53 +00002076 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002077
Douglas Gregor5fccd362010-03-03 23:55:11 +00002078 DestType = Method->getThisType(Context);
2079 DestRecordType = DestType->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002080
Douglas Gregor5fccd362010-03-03 23:55:11 +00002081 if (FromType->getAs<PointerType>()) {
2082 FromRecordType = FromType->getPointeeType();
2083 PointerConversions = true;
2084 } else {
2085 FromRecordType = FromType;
2086 DestType = DestRecordType;
2087 }
2088 } else {
2089 // No conversion necessary.
John Wiegley429bb272011-04-08 18:41:53 +00002090 return Owned(From);
Douglas Gregor5fccd362010-03-03 23:55:11 +00002091 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002092
Douglas Gregor5fccd362010-03-03 23:55:11 +00002093 if (DestType->isDependentType() || FromType->isDependentType())
John Wiegley429bb272011-04-08 18:41:53 +00002094 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002095
Douglas Gregor5fccd362010-03-03 23:55:11 +00002096 // If the unqualified types are the same, no conversion is necessary.
2097 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
John Wiegley429bb272011-04-08 18:41:53 +00002098 return Owned(From);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002099
John McCall6bb80172010-03-30 21:47:33 +00002100 SourceRange FromRange = From->getSourceRange();
2101 SourceLocation FromLoc = FromRange.getBegin();
2102
Eli Friedmanc1c0dfb2011-09-27 21:58:52 +00002103 ExprValueKind VK = From->getValueKind();
Sebastian Redl906082e2010-07-20 04:20:21 +00002104
Douglas Gregor5fccd362010-03-03 23:55:11 +00002105 // C++ [class.member.lookup]p8:
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002106 // [...] Ambiguities can often be resolved by qualifying a name with its
Douglas Gregor5fccd362010-03-03 23:55:11 +00002107 // class name.
2108 //
2109 // If the member was a qualified name and the qualified referred to a
2110 // specific base subobject type, we'll cast to that intermediate type
2111 // first and then to the object in which the member is declared. That allows
2112 // one to resolve ambiguities in, e.g., a diamond-shaped hierarchy such as:
2113 //
2114 // class Base { public: int x; };
2115 // class Derived1 : public Base { };
2116 // class Derived2 : public Base { };
2117 // class VeryDerived : public Derived1, public Derived2 { void f(); };
2118 //
2119 // void VeryDerived::f() {
2120 // x = 17; // error: ambiguous base subobjects
2121 // Derived1::x = 17; // okay, pick the Base subobject of Derived1
2122 // }
Douglas Gregor5fccd362010-03-03 23:55:11 +00002123 if (Qualifier) {
John McCall6bb80172010-03-30 21:47:33 +00002124 QualType QType = QualType(Qualifier->getAsType(), 0);
2125 assert(!QType.isNull() && "lookup done with dependent qualifier?");
2126 assert(QType->isRecordType() && "lookup done with non-record type");
2127
2128 QualType QRecordType = QualType(QType->getAs<RecordType>(), 0);
2129
2130 // In C++98, the qualifier type doesn't actually have to be a base
2131 // type of the object type, in which case we just ignore it.
2132 // Otherwise build the appropriate casts.
2133 if (IsDerivedFrom(FromRecordType, QRecordType)) {
John McCallf871d0c2010-08-07 06:22:56 +00002134 CXXCastPath BasePath;
John McCall6bb80172010-03-30 21:47:33 +00002135 if (CheckDerivedToBaseConversion(FromRecordType, QRecordType,
Anders Carlssoncee22422010-04-24 19:22:20 +00002136 FromLoc, FromRange, &BasePath))
John Wiegley429bb272011-04-08 18:41:53 +00002137 return ExprError();
John McCall6bb80172010-03-30 21:47:33 +00002138
Douglas Gregor5fccd362010-03-03 23:55:11 +00002139 if (PointerConversions)
John McCall6bb80172010-03-30 21:47:33 +00002140 QType = Context.getPointerType(QType);
John Wiegley429bb272011-04-08 18:41:53 +00002141 From = ImpCastExprToType(From, QType, CK_UncheckedDerivedToBase,
2142 VK, &BasePath).take();
John McCall6bb80172010-03-30 21:47:33 +00002143
2144 FromType = QType;
2145 FromRecordType = QRecordType;
2146
2147 // If the qualifier type was the same as the destination type,
2148 // we're done.
2149 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
John Wiegley429bb272011-04-08 18:41:53 +00002150 return Owned(From);
Douglas Gregor5fccd362010-03-03 23:55:11 +00002151 }
2152 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002153
John McCall6bb80172010-03-30 21:47:33 +00002154 bool IgnoreAccess = false;
Douglas Gregor5fccd362010-03-03 23:55:11 +00002155
John McCall6bb80172010-03-30 21:47:33 +00002156 // If we actually found the member through a using declaration, cast
2157 // down to the using declaration's type.
2158 //
2159 // Pointer equality is fine here because only one declaration of a
2160 // class ever has member declarations.
2161 if (FoundDecl->getDeclContext() != Member->getDeclContext()) {
2162 assert(isa<UsingShadowDecl>(FoundDecl));
2163 QualType URecordType = Context.getTypeDeclType(
2164 cast<CXXRecordDecl>(FoundDecl->getDeclContext()));
2165
2166 // We only need to do this if the naming-class to declaring-class
2167 // conversion is non-trivial.
2168 if (!Context.hasSameUnqualifiedType(FromRecordType, URecordType)) {
2169 assert(IsDerivedFrom(FromRecordType, URecordType));
John McCallf871d0c2010-08-07 06:22:56 +00002170 CXXCastPath BasePath;
John McCall6bb80172010-03-30 21:47:33 +00002171 if (CheckDerivedToBaseConversion(FromRecordType, URecordType,
Anders Carlssoncee22422010-04-24 19:22:20 +00002172 FromLoc, FromRange, &BasePath))
John Wiegley429bb272011-04-08 18:41:53 +00002173 return ExprError();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00002174
John McCall6bb80172010-03-30 21:47:33 +00002175 QualType UType = URecordType;
2176 if (PointerConversions)
2177 UType = Context.getPointerType(UType);
John Wiegley429bb272011-04-08 18:41:53 +00002178 From = ImpCastExprToType(From, UType, CK_UncheckedDerivedToBase,
2179 VK, &BasePath).take();
John McCall6bb80172010-03-30 21:47:33 +00002180 FromType = UType;
2181 FromRecordType = URecordType;
2182 }
2183
2184 // We don't do access control for the conversion from the
2185 // declaring class to the true declaring class.
2186 IgnoreAccess = true;
Douglas Gregor5fccd362010-03-03 23:55:11 +00002187 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002188
John McCallf871d0c2010-08-07 06:22:56 +00002189 CXXCastPath BasePath;
Anders Carlssoncee22422010-04-24 19:22:20 +00002190 if (CheckDerivedToBaseConversion(FromRecordType, DestRecordType,
2191 FromLoc, FromRange, &BasePath,
John McCall6bb80172010-03-30 21:47:33 +00002192 IgnoreAccess))
John Wiegley429bb272011-04-08 18:41:53 +00002193 return ExprError();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002194
John Wiegley429bb272011-04-08 18:41:53 +00002195 return ImpCastExprToType(From, DestType, CK_UncheckedDerivedToBase,
2196 VK, &BasePath);
Fariborz Jahanian98a541e2009-07-29 18:40:24 +00002197}
Douglas Gregor751f9a42009-06-30 15:47:41 +00002198
John McCallf7a1a742009-11-24 19:00:30 +00002199bool Sema::UseArgumentDependentLookup(const CXXScopeSpec &SS,
John McCall5b3f9132009-11-22 01:44:31 +00002200 const LookupResult &R,
2201 bool HasTrailingLParen) {
John McCallba135432009-11-21 08:51:07 +00002202 // Only when used directly as the postfix-expression of a call.
2203 if (!HasTrailingLParen)
2204 return false;
2205
2206 // Never if a scope specifier was provided.
John McCallf7a1a742009-11-24 19:00:30 +00002207 if (SS.isSet())
John McCallba135432009-11-21 08:51:07 +00002208 return false;
2209
2210 // Only in C++ or ObjC++.
John McCall5b3f9132009-11-22 01:44:31 +00002211 if (!getLangOptions().CPlusPlus)
John McCallba135432009-11-21 08:51:07 +00002212 return false;
2213
2214 // Turn off ADL when we find certain kinds of declarations during
2215 // normal lookup:
2216 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
2217 NamedDecl *D = *I;
2218
2219 // C++0x [basic.lookup.argdep]p3:
2220 // -- a declaration of a class member
2221 // Since using decls preserve this property, we check this on the
2222 // original decl.
John McCall3b4294e2009-12-16 12:17:52 +00002223 if (D->isCXXClassMember())
John McCallba135432009-11-21 08:51:07 +00002224 return false;
2225
2226 // C++0x [basic.lookup.argdep]p3:
2227 // -- a block-scope function declaration that is not a
2228 // using-declaration
2229 // NOTE: we also trigger this for function templates (in fact, we
2230 // don't check the decl type at all, since all other decl types
2231 // turn off ADL anyway).
2232 if (isa<UsingShadowDecl>(D))
2233 D = cast<UsingShadowDecl>(D)->getTargetDecl();
2234 else if (D->getDeclContext()->isFunctionOrMethod())
2235 return false;
2236
2237 // C++0x [basic.lookup.argdep]p3:
2238 // -- a declaration that is neither a function or a function
2239 // template
2240 // And also for builtin functions.
2241 if (isa<FunctionDecl>(D)) {
2242 FunctionDecl *FDecl = cast<FunctionDecl>(D);
2243
2244 // But also builtin functions.
2245 if (FDecl->getBuiltinID() && FDecl->isImplicit())
2246 return false;
2247 } else if (!isa<FunctionTemplateDecl>(D))
2248 return false;
2249 }
2250
2251 return true;
2252}
2253
2254
John McCallba135432009-11-21 08:51:07 +00002255/// Diagnoses obvious problems with the use of the given declaration
2256/// as an expression. This is only actually called for lookups that
2257/// were not overloaded, and it doesn't promise that the declaration
2258/// will in fact be used.
2259static bool CheckDeclInExpr(Sema &S, SourceLocation Loc, NamedDecl *D) {
Richard Smith162e1c12011-04-15 14:24:37 +00002260 if (isa<TypedefNameDecl>(D)) {
John McCallba135432009-11-21 08:51:07 +00002261 S.Diag(Loc, diag::err_unexpected_typedef) << D->getDeclName();
2262 return true;
2263 }
2264
2265 if (isa<ObjCInterfaceDecl>(D)) {
2266 S.Diag(Loc, diag::err_unexpected_interface) << D->getDeclName();
2267 return true;
2268 }
2269
2270 if (isa<NamespaceDecl>(D)) {
2271 S.Diag(Loc, diag::err_unexpected_namespace) << D->getDeclName();
2272 return true;
2273 }
2274
2275 return false;
2276}
2277
John McCall60d7b3a2010-08-24 06:29:42 +00002278ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00002279Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
John McCall5b3f9132009-11-22 01:44:31 +00002280 LookupResult &R,
2281 bool NeedsADL) {
John McCallfead20c2009-12-08 22:45:53 +00002282 // If this is a single, fully-resolved result and we don't need ADL,
2283 // just build an ordinary singleton decl ref.
Douglas Gregor86b8e092010-01-29 17:15:43 +00002284 if (!NeedsADL && R.isSingleResult() && !R.getAsSingle<FunctionTemplateDecl>())
Abramo Bagnara25777432010-08-11 22:01:17 +00002285 return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(),
2286 R.getFoundDecl());
John McCallba135432009-11-21 08:51:07 +00002287
2288 // We only need to check the declaration if there's exactly one
2289 // result, because in the overloaded case the results can only be
2290 // functions and function templates.
John McCall5b3f9132009-11-22 01:44:31 +00002291 if (R.isSingleResult() &&
2292 CheckDeclInExpr(*this, R.getNameLoc(), R.getFoundDecl()))
John McCallba135432009-11-21 08:51:07 +00002293 return ExprError();
2294
John McCallc373d482010-01-27 01:50:18 +00002295 // Otherwise, just build an unresolved lookup expression. Suppress
2296 // any lookup-related diagnostics; we'll hash these out later, when
2297 // we've picked a target.
2298 R.suppressDiagnostics();
2299
John McCallba135432009-11-21 08:51:07 +00002300 UnresolvedLookupExpr *ULE
Douglas Gregorbebbe0d2010-12-15 01:34:56 +00002301 = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
Douglas Gregor4c9be892011-02-28 20:01:57 +00002302 SS.getWithLocInContext(Context),
2303 R.getLookupNameInfo(),
Douglas Gregor5a84dec2010-05-23 18:57:34 +00002304 NeedsADL, R.isOverloadedResult(),
2305 R.begin(), R.end());
John McCallba135432009-11-21 08:51:07 +00002306
2307 return Owned(ULE);
2308}
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002309
John McCallba135432009-11-21 08:51:07 +00002310/// \brief Complete semantic analysis for a reference to the given declaration.
John McCall60d7b3a2010-08-24 06:29:42 +00002311ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00002312Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00002313 const DeclarationNameInfo &NameInfo,
2314 NamedDecl *D) {
John McCallba135432009-11-21 08:51:07 +00002315 assert(D && "Cannot refer to a NULL declaration");
John McCall7453ed42009-11-22 00:44:51 +00002316 assert(!isa<FunctionTemplateDecl>(D) &&
2317 "Cannot refer unambiguously to a function template");
John McCallba135432009-11-21 08:51:07 +00002318
Abramo Bagnara25777432010-08-11 22:01:17 +00002319 SourceLocation Loc = NameInfo.getLoc();
John McCallba135432009-11-21 08:51:07 +00002320 if (CheckDeclInExpr(*this, Loc, D))
2321 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00002322
Douglas Gregor9af2f522009-12-01 16:58:18 +00002323 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) {
2324 // Specifically diagnose references to class templates that are missing
2325 // a template argument list.
2326 Diag(Loc, diag::err_template_decl_ref)
2327 << Template << SS.getRange();
2328 Diag(Template->getLocation(), diag::note_template_decl_here);
2329 return ExprError();
2330 }
2331
2332 // Make sure that we're referring to a value.
2333 ValueDecl *VD = dyn_cast<ValueDecl>(D);
2334 if (!VD) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002335 Diag(Loc, diag::err_ref_non_value)
Douglas Gregor9af2f522009-12-01 16:58:18 +00002336 << D << SS.getRange();
John McCall87cf6702009-12-18 18:35:10 +00002337 Diag(D->getLocation(), diag::note_declared_at);
Douglas Gregor9af2f522009-12-01 16:58:18 +00002338 return ExprError();
2339 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002340
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002341 // Check whether this declaration can be used. Note that we suppress
2342 // this check when we're going to perform argument-dependent lookup
2343 // on this function name, because this might not be the function
2344 // that overload resolution actually selects.
John McCallba135432009-11-21 08:51:07 +00002345 if (DiagnoseUseOfDecl(VD, Loc))
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002346 return ExprError();
2347
Steve Naroffdd972f22008-09-05 22:11:13 +00002348 // Only create DeclRefExpr's for valid Decl's.
2349 if (VD->isInvalidDecl())
Sebastian Redlcd965b92009-01-18 18:53:16 +00002350 return ExprError();
2351
John McCall5808ce42011-02-03 08:15:49 +00002352 // Handle members of anonymous structs and unions. If we got here,
2353 // and the reference is to a class member indirect field, then this
2354 // must be the subject of a pointer-to-member expression.
2355 if (IndirectFieldDecl *indirectField = dyn_cast<IndirectFieldDecl>(VD))
2356 if (!indirectField->isCXXClassMember())
2357 return BuildAnonymousStructUnionMemberReference(SS, NameInfo.getLoc(),
2358 indirectField);
Francois Pichet87c2e122010-11-21 06:08:52 +00002359
Chris Lattner639e2d32008-10-20 05:16:36 +00002360 // If the identifier reference is inside a block, and it refers to a value
2361 // that is outside the block, create a BlockDeclRefExpr instead of a
2362 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when
2363 // the block is formed.
Steve Naroffdd972f22008-09-05 22:11:13 +00002364 //
Chris Lattner639e2d32008-10-20 05:16:36 +00002365 // We do not do this for things like enum constants, global variables, etc,
2366 // as they do not get snapshotted.
2367 //
John McCall6b5a61b2011-02-07 10:33:21 +00002368 switch (shouldCaptureValueReference(*this, NameInfo.getLoc(), VD)) {
John McCall469a1eb2011-02-02 13:00:07 +00002369 case CR_Error:
2370 return ExprError();
Mike Stump0d6fd572010-01-05 02:56:35 +00002371
John McCall469a1eb2011-02-02 13:00:07 +00002372 case CR_Capture:
John McCall6b5a61b2011-02-07 10:33:21 +00002373 assert(!SS.isSet() && "referenced local variable with scope specifier?");
2374 return BuildBlockDeclRefExpr(*this, VD, NameInfo, /*byref*/ false);
2375
2376 case CR_CaptureByRef:
2377 assert(!SS.isSet() && "referenced local variable with scope specifier?");
2378 return BuildBlockDeclRefExpr(*this, VD, NameInfo, /*byref*/ true);
John McCall76a40212011-02-09 01:13:10 +00002379
2380 case CR_NoCapture: {
2381 // If this reference is not in a block or if the referenced
2382 // variable is within the block, create a normal DeclRefExpr.
2383
2384 QualType type = VD->getType();
Daniel Dunbarb20de812011-02-10 18:29:28 +00002385 ExprValueKind valueKind = VK_RValue;
John McCall76a40212011-02-09 01:13:10 +00002386
2387 switch (D->getKind()) {
2388 // Ignore all the non-ValueDecl kinds.
2389#define ABSTRACT_DECL(kind)
2390#define VALUE(type, base)
2391#define DECL(type, base) \
2392 case Decl::type:
2393#include "clang/AST/DeclNodes.inc"
2394 llvm_unreachable("invalid value decl kind");
2395 return ExprError();
2396
2397 // These shouldn't make it here.
2398 case Decl::ObjCAtDefsField:
2399 case Decl::ObjCIvar:
2400 llvm_unreachable("forming non-member reference to ivar?");
2401 return ExprError();
2402
2403 // Enum constants are always r-values and never references.
2404 // Unresolved using declarations are dependent.
2405 case Decl::EnumConstant:
2406 case Decl::UnresolvedUsingValue:
2407 valueKind = VK_RValue;
2408 break;
2409
2410 // Fields and indirect fields that got here must be for
2411 // pointer-to-member expressions; we just call them l-values for
2412 // internal consistency, because this subexpression doesn't really
2413 // exist in the high-level semantics.
2414 case Decl::Field:
2415 case Decl::IndirectField:
2416 assert(getLangOptions().CPlusPlus &&
2417 "building reference to field in C?");
2418
2419 // These can't have reference type in well-formed programs, but
2420 // for internal consistency we do this anyway.
2421 type = type.getNonReferenceType();
2422 valueKind = VK_LValue;
2423 break;
2424
2425 // Non-type template parameters are either l-values or r-values
2426 // depending on the type.
2427 case Decl::NonTypeTemplateParm: {
2428 if (const ReferenceType *reftype = type->getAs<ReferenceType>()) {
2429 type = reftype->getPointeeType();
2430 valueKind = VK_LValue; // even if the parameter is an r-value reference
2431 break;
2432 }
2433
2434 // For non-references, we need to strip qualifiers just in case
2435 // the template parameter was declared as 'const int' or whatever.
2436 valueKind = VK_RValue;
2437 type = type.getUnqualifiedType();
2438 break;
2439 }
2440
2441 case Decl::Var:
2442 // In C, "extern void blah;" is valid and is an r-value.
2443 if (!getLangOptions().CPlusPlus &&
2444 !type.hasQualifiers() &&
2445 type->isVoidType()) {
2446 valueKind = VK_RValue;
2447 break;
2448 }
2449 // fallthrough
2450
2451 case Decl::ImplicitParam:
2452 case Decl::ParmVar:
2453 // These are always l-values.
2454 valueKind = VK_LValue;
2455 type = type.getNonReferenceType();
2456 break;
2457
2458 case Decl::Function: {
John McCall755d8492011-04-12 00:42:48 +00002459 const FunctionType *fty = type->castAs<FunctionType>();
2460
2461 // If we're referring to a function with an __unknown_anytype
2462 // result type, make the entire expression __unknown_anytype.
2463 if (fty->getResultType() == Context.UnknownAnyTy) {
2464 type = Context.UnknownAnyTy;
2465 valueKind = VK_RValue;
2466 break;
2467 }
2468
John McCall76a40212011-02-09 01:13:10 +00002469 // Functions are l-values in C++.
2470 if (getLangOptions().CPlusPlus) {
2471 valueKind = VK_LValue;
2472 break;
2473 }
2474
2475 // C99 DR 316 says that, if a function type comes from a
2476 // function definition (without a prototype), that type is only
2477 // used for checking compatibility. Therefore, when referencing
2478 // the function, we pretend that we don't have the full function
2479 // type.
John McCall755d8492011-04-12 00:42:48 +00002480 if (!cast<FunctionDecl>(VD)->hasPrototype() &&
2481 isa<FunctionProtoType>(fty))
2482 type = Context.getFunctionNoProtoType(fty->getResultType(),
2483 fty->getExtInfo());
John McCall76a40212011-02-09 01:13:10 +00002484
2485 // Functions are r-values in C.
2486 valueKind = VK_RValue;
2487 break;
2488 }
2489
2490 case Decl::CXXMethod:
John McCall755d8492011-04-12 00:42:48 +00002491 // If we're referring to a method with an __unknown_anytype
2492 // result type, make the entire expression __unknown_anytype.
2493 // This should only be possible with a type written directly.
Richard Trieu67e29332011-08-02 04:35:43 +00002494 if (const FunctionProtoType *proto
2495 = dyn_cast<FunctionProtoType>(VD->getType()))
John McCall755d8492011-04-12 00:42:48 +00002496 if (proto->getResultType() == Context.UnknownAnyTy) {
2497 type = Context.UnknownAnyTy;
2498 valueKind = VK_RValue;
2499 break;
2500 }
2501
John McCall76a40212011-02-09 01:13:10 +00002502 // C++ methods are l-values if static, r-values if non-static.
2503 if (cast<CXXMethodDecl>(VD)->isStatic()) {
2504 valueKind = VK_LValue;
2505 break;
2506 }
2507 // fallthrough
2508
2509 case Decl::CXXConversion:
2510 case Decl::CXXDestructor:
2511 case Decl::CXXConstructor:
2512 valueKind = VK_RValue;
2513 break;
2514 }
2515
2516 return BuildDeclRefExpr(VD, type, valueKind, NameInfo, &SS);
2517 }
2518
John McCall469a1eb2011-02-02 13:00:07 +00002519 }
John McCallf89e55a2010-11-18 06:31:45 +00002520
John McCall6b5a61b2011-02-07 10:33:21 +00002521 llvm_unreachable("unknown capture result");
2522 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00002523}
2524
John McCall755d8492011-04-12 00:42:48 +00002525ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind) {
Chris Lattnerd9f69102008-08-10 01:53:14 +00002526 PredefinedExpr::IdentType IT;
Sebastian Redlcd965b92009-01-18 18:53:16 +00002527
Reid Spencer5f016e22007-07-11 17:01:13 +00002528 switch (Kind) {
David Blaikieb219cfc2011-09-23 05:06:16 +00002529 default: llvm_unreachable("Unknown simple primary expr!");
Chris Lattnerd9f69102008-08-10 01:53:14 +00002530 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2]
2531 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break;
2532 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00002533 }
Chris Lattner1423ea42008-01-12 18:39:25 +00002534
Chris Lattnerfa28b302008-01-12 08:14:25 +00002535 // Pre-defined identifiers are of type char[x], where x is the length of the
2536 // string.
Mike Stump1eb44332009-09-09 15:08:12 +00002537
Anders Carlsson3a082d82009-09-08 18:24:21 +00002538 Decl *currentDecl = getCurFunctionOrMethodDecl();
Fariborz Jahanianeb024ac2010-07-23 21:53:24 +00002539 if (!currentDecl && getCurBlock())
2540 currentDecl = getCurBlock()->TheDecl;
Anders Carlsson3a082d82009-09-08 18:24:21 +00002541 if (!currentDecl) {
Chris Lattnerb0da9232008-12-12 05:05:20 +00002542 Diag(Loc, diag::ext_predef_outside_function);
Anders Carlsson3a082d82009-09-08 18:24:21 +00002543 currentDecl = Context.getTranslationUnitDecl();
Chris Lattnerb0da9232008-12-12 05:05:20 +00002544 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002545
Anders Carlsson773f3972009-09-11 01:22:35 +00002546 QualType ResTy;
2547 if (cast<DeclContext>(currentDecl)->isDependentContext()) {
2548 ResTy = Context.DependentTy;
2549 } else {
Anders Carlsson848fa642010-02-11 18:20:28 +00002550 unsigned Length = PredefinedExpr::ComputeName(IT, currentDecl).length();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002551
Anders Carlsson773f3972009-09-11 01:22:35 +00002552 llvm::APInt LengthI(32, Length + 1);
John McCall0953e762009-09-24 19:53:00 +00002553 ResTy = Context.CharTy.withConst();
Anders Carlsson773f3972009-09-11 01:22:35 +00002554 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0);
2555 }
Steve Naroff6ece14c2009-01-21 00:14:39 +00002556 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT));
Reid Spencer5f016e22007-07-11 17:01:13 +00002557}
2558
John McCall60d7b3a2010-08-24 06:29:42 +00002559ExprResult Sema::ActOnCharacterConstant(const Token &Tok) {
Reid Spencer5f016e22007-07-11 17:01:13 +00002560 llvm::SmallString<16> CharBuffer;
Douglas Gregor453091c2010-03-16 22:30:13 +00002561 bool Invalid = false;
Chris Lattner5f9e2722011-07-23 10:55:15 +00002562 StringRef ThisTok = PP.getSpelling(Tok, CharBuffer, &Invalid);
Douglas Gregor453091c2010-03-16 22:30:13 +00002563 if (Invalid)
2564 return ExprError();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002565
Benjamin Kramerddeea562010-02-27 13:44:12 +00002566 CharLiteralParser Literal(ThisTok.begin(), ThisTok.end(), Tok.getLocation(),
Douglas Gregor5cee1192011-07-27 05:40:30 +00002567 PP, Tok.getKind());
Reid Spencer5f016e22007-07-11 17:01:13 +00002568 if (Literal.hadError())
Sebastian Redlcd965b92009-01-18 18:53:16 +00002569 return ExprError();
Chris Lattnerfc62bfd2008-03-01 08:32:21 +00002570
Chris Lattnere8337df2009-12-30 21:19:39 +00002571 QualType Ty;
2572 if (!getLangOptions().CPlusPlus)
2573 Ty = Context.IntTy; // 'x' and L'x' -> int in C.
2574 else if (Literal.isWide())
2575 Ty = Context.WCharTy; // L'x' -> wchar_t in C++.
Douglas Gregor5cee1192011-07-27 05:40:30 +00002576 else if (Literal.isUTF16())
2577 Ty = Context.Char16Ty; // u'x' -> char16_t in C++0x.
2578 else if (Literal.isUTF32())
2579 Ty = Context.Char32Ty; // U'x' -> char32_t in C++0x.
Eli Friedman136b0cd2010-02-03 18:21:45 +00002580 else if (Literal.isMultiChar())
2581 Ty = Context.IntTy; // 'wxyz' -> int in C++.
Chris Lattnere8337df2009-12-30 21:19:39 +00002582 else
2583 Ty = Context.CharTy; // 'x' -> char in C++
Chris Lattnerfc62bfd2008-03-01 08:32:21 +00002584
Douglas Gregor5cee1192011-07-27 05:40:30 +00002585 CharacterLiteral::CharacterKind Kind = CharacterLiteral::Ascii;
2586 if (Literal.isWide())
2587 Kind = CharacterLiteral::Wide;
2588 else if (Literal.isUTF16())
2589 Kind = CharacterLiteral::UTF16;
2590 else if (Literal.isUTF32())
2591 Kind = CharacterLiteral::UTF32;
2592
2593 return Owned(new (Context) CharacterLiteral(Literal.getValue(), Kind, Ty,
2594 Tok.getLocation()));
Reid Spencer5f016e22007-07-11 17:01:13 +00002595}
2596
John McCall60d7b3a2010-08-24 06:29:42 +00002597ExprResult Sema::ActOnNumericConstant(const Token &Tok) {
Sebastian Redlcd965b92009-01-18 18:53:16 +00002598 // Fast path for a single digit (which is quite common). A single digit
Reid Spencer5f016e22007-07-11 17:01:13 +00002599 // cannot have a trigraph, escaped newline, radix prefix, or type suffix.
2600 if (Tok.getLength() == 1) {
Chris Lattner7216dc92009-01-26 22:36:52 +00002601 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok);
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002602 unsigned IntSize = Context.getTargetInfo().getIntWidth();
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002603 return Owned(IntegerLiteral::Create(Context, llvm::APInt(IntSize, Val-'0'),
Steve Naroff0a473932009-01-20 19:53:53 +00002604 Context.IntTy, Tok.getLocation()));
Reid Spencer5f016e22007-07-11 17:01:13 +00002605 }
Ted Kremenek28396602009-01-13 23:19:12 +00002606
Reid Spencer5f016e22007-07-11 17:01:13 +00002607 llvm::SmallString<512> IntegerBuffer;
Chris Lattner2a299042008-09-30 20:53:45 +00002608 // Add padding so that NumericLiteralParser can overread by one character.
2609 IntegerBuffer.resize(Tok.getLength()+1);
Reid Spencer5f016e22007-07-11 17:01:13 +00002610 const char *ThisTokBegin = &IntegerBuffer[0];
Sebastian Redlcd965b92009-01-18 18:53:16 +00002611
Reid Spencer5f016e22007-07-11 17:01:13 +00002612 // Get the spelling of the token, which eliminates trigraphs, etc.
Douglas Gregor453091c2010-03-16 22:30:13 +00002613 bool Invalid = false;
2614 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin, &Invalid);
2615 if (Invalid)
2616 return ExprError();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002617
Mike Stump1eb44332009-09-09 15:08:12 +00002618 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength,
Reid Spencer5f016e22007-07-11 17:01:13 +00002619 Tok.getLocation(), PP);
2620 if (Literal.hadError)
Sebastian Redlcd965b92009-01-18 18:53:16 +00002621 return ExprError();
2622
Chris Lattner5d661452007-08-26 03:42:43 +00002623 Expr *Res;
Sebastian Redlcd965b92009-01-18 18:53:16 +00002624
Chris Lattner5d661452007-08-26 03:42:43 +00002625 if (Literal.isFloatingLiteral()) {
Chris Lattner525a0502007-09-22 18:29:59 +00002626 QualType Ty;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002627 if (Literal.isFloat)
Chris Lattner525a0502007-09-22 18:29:59 +00002628 Ty = Context.FloatTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002629 else if (!Literal.isLong)
Chris Lattner525a0502007-09-22 18:29:59 +00002630 Ty = Context.DoubleTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002631 else
Chris Lattner9e9b6dc2008-03-08 08:52:55 +00002632 Ty = Context.LongDoubleTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002633
2634 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty);
2635
John McCall94c939d2009-12-24 09:08:04 +00002636 using llvm::APFloat;
2637 APFloat Val(Format);
2638
2639 APFloat::opStatus result = Literal.GetFloatValue(Val);
John McCall9f2df882009-12-24 11:09:08 +00002640
2641 // Overflow is always an error, but underflow is only an error if
2642 // we underflowed to zero (APFloat reports denormals as underflow).
2643 if ((result & APFloat::opOverflow) ||
2644 ((result & APFloat::opUnderflow) && Val.isZero())) {
John McCall94c939d2009-12-24 09:08:04 +00002645 unsigned diagnostic;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002646 llvm::SmallString<20> buffer;
John McCall94c939d2009-12-24 09:08:04 +00002647 if (result & APFloat::opOverflow) {
John McCall2a0d7572010-02-26 23:35:57 +00002648 diagnostic = diag::warn_float_overflow;
John McCall94c939d2009-12-24 09:08:04 +00002649 APFloat::getLargest(Format).toString(buffer);
2650 } else {
John McCall2a0d7572010-02-26 23:35:57 +00002651 diagnostic = diag::warn_float_underflow;
John McCall94c939d2009-12-24 09:08:04 +00002652 APFloat::getSmallest(Format).toString(buffer);
2653 }
2654
2655 Diag(Tok.getLocation(), diagnostic)
2656 << Ty
Chris Lattner5f9e2722011-07-23 10:55:15 +00002657 << StringRef(buffer.data(), buffer.size());
John McCall94c939d2009-12-24 09:08:04 +00002658 }
2659
2660 bool isExact = (result == APFloat::opOK);
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002661 Res = FloatingLiteral::Create(Context, Val, isExact, Ty, Tok.getLocation());
Sebastian Redlcd965b92009-01-18 18:53:16 +00002662
Peter Collingbournef4f7cb82011-03-11 19:24:59 +00002663 if (Ty == Context.DoubleTy) {
2664 if (getLangOptions().SinglePrecisionConstants) {
John Wiegley429bb272011-04-08 18:41:53 +00002665 Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).take();
Peter Collingbournef4f7cb82011-03-11 19:24:59 +00002666 } else if (getLangOptions().OpenCL && !getOpenCLOptions().cl_khr_fp64) {
2667 Diag(Tok.getLocation(), diag::warn_double_const_requires_fp64);
John Wiegley429bb272011-04-08 18:41:53 +00002668 Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).take();
Peter Collingbournef4f7cb82011-03-11 19:24:59 +00002669 }
2670 }
Chris Lattner5d661452007-08-26 03:42:43 +00002671 } else if (!Literal.isIntegerLiteral()) {
Sebastian Redlcd965b92009-01-18 18:53:16 +00002672 return ExprError();
Chris Lattner5d661452007-08-26 03:42:43 +00002673 } else {
Chris Lattnerf0467b32008-04-02 04:24:33 +00002674 QualType Ty;
Reid Spencer5f016e22007-07-11 17:01:13 +00002675
Neil Boothb9449512007-08-29 22:00:19 +00002676 // long long is a C99 feature.
Richard Smithebaf0e62011-10-18 20:49:44 +00002677 if (!getLangOptions().C99 && Literal.isLongLong)
2678 Diag(Tok.getLocation(),
2679 getLangOptions().CPlusPlus0x ?
2680 diag::warn_cxx98_compat_longlong : diag::ext_longlong);
Neil Boothb9449512007-08-29 22:00:19 +00002681
Reid Spencer5f016e22007-07-11 17:01:13 +00002682 // Get the value in the widest-possible width.
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002683 llvm::APInt ResultVal(Context.getTargetInfo().getIntMaxTWidth(), 0);
Sebastian Redlcd965b92009-01-18 18:53:16 +00002684
Reid Spencer5f016e22007-07-11 17:01:13 +00002685 if (Literal.GetIntegerValue(ResultVal)) {
2686 // If this value didn't fit into uintmax_t, warn and force to ull.
2687 Diag(Tok.getLocation(), diag::warn_integer_too_large);
Chris Lattnerf0467b32008-04-02 04:24:33 +00002688 Ty = Context.UnsignedLongLongTy;
2689 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() &&
Chris Lattner98be4942008-03-05 18:54:05 +00002690 "long long is not intmax_t?");
Reid Spencer5f016e22007-07-11 17:01:13 +00002691 } else {
2692 // If this value fits into a ULL, try to figure out what else it fits into
2693 // according to the rules of C99 6.4.4.1p5.
Sebastian Redlcd965b92009-01-18 18:53:16 +00002694
Reid Spencer5f016e22007-07-11 17:01:13 +00002695 // Octal, Hexadecimal, and integers with a U suffix are allowed to
2696 // be an unsigned int.
2697 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10;
2698
2699 // Check from smallest to largest, picking the smallest type we can.
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002700 unsigned Width = 0;
Chris Lattner97c51562007-08-23 21:58:08 +00002701 if (!Literal.isLong && !Literal.isLongLong) {
2702 // Are int/unsigned possibilities?
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002703 unsigned IntSize = Context.getTargetInfo().getIntWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002704
Reid Spencer5f016e22007-07-11 17:01:13 +00002705 // Does it fit in a unsigned int?
2706 if (ResultVal.isIntN(IntSize)) {
2707 // Does it fit in a signed int?
2708 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002709 Ty = Context.IntTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00002710 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002711 Ty = Context.UnsignedIntTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002712 Width = IntSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00002713 }
Reid Spencer5f016e22007-07-11 17:01:13 +00002714 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002715
Reid Spencer5f016e22007-07-11 17:01:13 +00002716 // Are long/unsigned long possibilities?
Chris Lattnerf0467b32008-04-02 04:24:33 +00002717 if (Ty.isNull() && !Literal.isLongLong) {
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002718 unsigned LongSize = Context.getTargetInfo().getLongWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002719
Reid Spencer5f016e22007-07-11 17:01:13 +00002720 // Does it fit in a unsigned long?
2721 if (ResultVal.isIntN(LongSize)) {
2722 // Does it fit in a signed long?
2723 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002724 Ty = Context.LongTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00002725 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002726 Ty = Context.UnsignedLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002727 Width = LongSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00002728 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002729 }
2730
Reid Spencer5f016e22007-07-11 17:01:13 +00002731 // Finally, check long long if needed.
Chris Lattnerf0467b32008-04-02 04:24:33 +00002732 if (Ty.isNull()) {
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002733 unsigned LongLongSize = Context.getTargetInfo().getLongLongWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002734
Reid Spencer5f016e22007-07-11 17:01:13 +00002735 // Does it fit in a unsigned long long?
2736 if (ResultVal.isIntN(LongLongSize)) {
2737 // Does it fit in a signed long long?
Francois Pichet24323202011-01-11 23:38:13 +00002738 // To be compatible with MSVC, hex integer literals ending with the
2739 // LL or i64 suffix are always signed in Microsoft mode.
Francois Picheta15a5ee2011-01-11 12:23:00 +00002740 if (!Literal.isUnsigned && (ResultVal[LongLongSize-1] == 0 ||
Francois Pichet62ec1f22011-09-17 17:15:52 +00002741 (getLangOptions().MicrosoftExt && Literal.isLongLong)))
Chris Lattnerf0467b32008-04-02 04:24:33 +00002742 Ty = Context.LongLongTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00002743 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002744 Ty = Context.UnsignedLongLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002745 Width = LongLongSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00002746 }
2747 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002748
Reid Spencer5f016e22007-07-11 17:01:13 +00002749 // If we still couldn't decide a type, we probably have something that
2750 // does not fit in a signed long long, but has no U suffix.
Chris Lattnerf0467b32008-04-02 04:24:33 +00002751 if (Ty.isNull()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00002752 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed);
Chris Lattnerf0467b32008-04-02 04:24:33 +00002753 Ty = Context.UnsignedLongLongTy;
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00002754 Width = Context.getTargetInfo().getLongLongWidth();
Reid Spencer5f016e22007-07-11 17:01:13 +00002755 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002756
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002757 if (ResultVal.getBitWidth() != Width)
Jay Foad9f71a8f2010-12-07 08:25:34 +00002758 ResultVal = ResultVal.trunc(Width);
Reid Spencer5f016e22007-07-11 17:01:13 +00002759 }
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002760 Res = IntegerLiteral::Create(Context, ResultVal, Ty, Tok.getLocation());
Reid Spencer5f016e22007-07-11 17:01:13 +00002761 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002762
Chris Lattner5d661452007-08-26 03:42:43 +00002763 // If this is an imaginary literal, create the ImaginaryLiteral wrapper.
2764 if (Literal.isImaginary)
Mike Stump1eb44332009-09-09 15:08:12 +00002765 Res = new (Context) ImaginaryLiteral(Res,
Steve Naroff6ece14c2009-01-21 00:14:39 +00002766 Context.getComplexType(Res->getType()));
Sebastian Redlcd965b92009-01-18 18:53:16 +00002767
2768 return Owned(Res);
Reid Spencer5f016e22007-07-11 17:01:13 +00002769}
2770
Richard Trieuccd891a2011-09-09 01:45:06 +00002771ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, Expr *E) {
Chris Lattnerf0467b32008-04-02 04:24:33 +00002772 assert((E != 0) && "ActOnParenExpr() missing expr");
Steve Naroff6ece14c2009-01-21 00:14:39 +00002773 return Owned(new (Context) ParenExpr(L, R, E));
Reid Spencer5f016e22007-07-11 17:01:13 +00002774}
2775
Chandler Carruthdf1f3772011-05-26 08:53:12 +00002776static bool CheckVecStepTraitOperandType(Sema &S, QualType T,
2777 SourceLocation Loc,
2778 SourceRange ArgRange) {
2779 // [OpenCL 1.1 6.11.12] "The vec_step built-in function takes a built-in
2780 // scalar or vector data type argument..."
2781 // Every built-in scalar type (OpenCL 1.1 6.1.1) is either an arithmetic
2782 // type (C99 6.2.5p18) or void.
2783 if (!(T->isArithmeticType() || T->isVoidType() || T->isVectorType())) {
2784 S.Diag(Loc, diag::err_vecstep_non_scalar_vector_type)
2785 << T << ArgRange;
2786 return true;
2787 }
2788
2789 assert((T->isVoidType() || !T->isIncompleteType()) &&
2790 "Scalar types should always be complete");
2791 return false;
2792}
2793
Chandler Carruth42ec65d2011-05-26 08:53:16 +00002794static bool CheckExtensionTraitOperandType(Sema &S, QualType T,
2795 SourceLocation Loc,
2796 SourceRange ArgRange,
2797 UnaryExprOrTypeTrait TraitKind) {
2798 // C99 6.5.3.4p1:
2799 if (T->isFunctionType()) {
2800 // alignof(function) is allowed as an extension.
2801 if (TraitKind == UETT_SizeOf)
2802 S.Diag(Loc, diag::ext_sizeof_function_type) << ArgRange;
2803 return false;
2804 }
2805
2806 // Allow sizeof(void)/alignof(void) as an extension.
2807 if (T->isVoidType()) {
2808 S.Diag(Loc, diag::ext_sizeof_void_type) << TraitKind << ArgRange;
2809 return false;
2810 }
2811
2812 return true;
2813}
2814
2815static bool CheckObjCTraitOperandConstraints(Sema &S, QualType T,
2816 SourceLocation Loc,
2817 SourceRange ArgRange,
2818 UnaryExprOrTypeTrait TraitKind) {
2819 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode.
2820 if (S.LangOpts.ObjCNonFragileABI && T->isObjCObjectType()) {
2821 S.Diag(Loc, diag::err_sizeof_nonfragile_interface)
2822 << T << (TraitKind == UETT_SizeOf)
2823 << ArgRange;
2824 return true;
2825 }
2826
2827 return false;
2828}
2829
Chandler Carruth9d342d02011-05-26 08:53:10 +00002830/// \brief Check the constrains on expression operands to unary type expression
2831/// and type traits.
2832///
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002833/// Completes any types necessary and validates the constraints on the operand
2834/// expression. The logic mostly mirrors the type-based overload, but may modify
2835/// the expression as it completes the type for that expression through template
2836/// instantiation, etc.
Richard Trieuccd891a2011-09-09 01:45:06 +00002837bool Sema::CheckUnaryExprOrTypeTraitOperand(Expr *E,
Chandler Carruth9d342d02011-05-26 08:53:10 +00002838 UnaryExprOrTypeTrait ExprKind) {
Richard Trieuccd891a2011-09-09 01:45:06 +00002839 QualType ExprTy = E->getType();
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002840
2841 // C++ [expr.sizeof]p2: "When applied to a reference or a reference type,
2842 // the result is the size of the referenced type."
2843 // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the
2844 // result shall be the alignment of the referenced type."
2845 if (const ReferenceType *Ref = ExprTy->getAs<ReferenceType>())
2846 ExprTy = Ref->getPointeeType();
2847
2848 if (ExprKind == UETT_VecStep)
Richard Trieuccd891a2011-09-09 01:45:06 +00002849 return CheckVecStepTraitOperandType(*this, ExprTy, E->getExprLoc(),
2850 E->getSourceRange());
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002851
2852 // Whitelist some types as extensions
Richard Trieuccd891a2011-09-09 01:45:06 +00002853 if (!CheckExtensionTraitOperandType(*this, ExprTy, E->getExprLoc(),
2854 E->getSourceRange(), ExprKind))
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002855 return false;
2856
Richard Trieuccd891a2011-09-09 01:45:06 +00002857 if (RequireCompleteExprType(E,
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002858 PDiag(diag::err_sizeof_alignof_incomplete_type)
Richard Trieuccd891a2011-09-09 01:45:06 +00002859 << ExprKind << E->getSourceRange(),
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002860 std::make_pair(SourceLocation(), PDiag(0))))
2861 return true;
2862
2863 // Completeing the expression's type may have changed it.
Richard Trieuccd891a2011-09-09 01:45:06 +00002864 ExprTy = E->getType();
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002865 if (const ReferenceType *Ref = ExprTy->getAs<ReferenceType>())
2866 ExprTy = Ref->getPointeeType();
2867
Richard Trieuccd891a2011-09-09 01:45:06 +00002868 if (CheckObjCTraitOperandConstraints(*this, ExprTy, E->getExprLoc(),
2869 E->getSourceRange(), ExprKind))
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002870 return true;
2871
Nico Webercf739922011-06-15 02:47:03 +00002872 if (ExprKind == UETT_SizeOf) {
Richard Trieuccd891a2011-09-09 01:45:06 +00002873 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
Nico Webercf739922011-06-15 02:47:03 +00002874 if (ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(DeclRef->getFoundDecl())) {
2875 QualType OType = PVD->getOriginalType();
2876 QualType Type = PVD->getType();
2877 if (Type->isPointerType() && OType->isArrayType()) {
Richard Trieuccd891a2011-09-09 01:45:06 +00002878 Diag(E->getExprLoc(), diag::warn_sizeof_array_param)
Nico Webercf739922011-06-15 02:47:03 +00002879 << Type << OType;
2880 Diag(PVD->getLocation(), diag::note_declared_at);
2881 }
2882 }
2883 }
2884 }
2885
Chandler Carruthe4d645c2011-05-27 01:33:31 +00002886 return false;
Chandler Carruth9d342d02011-05-26 08:53:10 +00002887}
2888
2889/// \brief Check the constraints on operands to unary expression and type
2890/// traits.
2891///
2892/// This will complete any types necessary, and validate the various constraints
2893/// on those operands.
2894///
Reid Spencer5f016e22007-07-11 17:01:13 +00002895/// The UsualUnaryConversions() function is *not* called by this routine.
Chandler Carruth9d342d02011-05-26 08:53:10 +00002896/// C99 6.3.2.1p[2-4] all state:
2897/// Except when it is the operand of the sizeof operator ...
2898///
2899/// C++ [expr.sizeof]p4
2900/// The lvalue-to-rvalue, array-to-pointer, and function-to-pointer
2901/// standard conversions are not applied to the operand of sizeof.
2902///
2903/// This policy is followed for all of the unary trait expressions.
Richard Trieuccd891a2011-09-09 01:45:06 +00002904bool Sema::CheckUnaryExprOrTypeTraitOperand(QualType ExprType,
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002905 SourceLocation OpLoc,
2906 SourceRange ExprRange,
2907 UnaryExprOrTypeTrait ExprKind) {
Richard Trieuccd891a2011-09-09 01:45:06 +00002908 if (ExprType->isDependentType())
Sebastian Redl28507842009-02-26 14:39:58 +00002909 return false;
2910
Sebastian Redl5d484e82009-11-23 17:18:46 +00002911 // C++ [expr.sizeof]p2: "When applied to a reference or a reference type,
2912 // the result is the size of the referenced type."
2913 // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the
2914 // result shall be the alignment of the referenced type."
Richard Trieuccd891a2011-09-09 01:45:06 +00002915 if (const ReferenceType *Ref = ExprType->getAs<ReferenceType>())
2916 ExprType = Ref->getPointeeType();
Sebastian Redl5d484e82009-11-23 17:18:46 +00002917
Chandler Carruthdf1f3772011-05-26 08:53:12 +00002918 if (ExprKind == UETT_VecStep)
Richard Trieuccd891a2011-09-09 01:45:06 +00002919 return CheckVecStepTraitOperandType(*this, ExprType, OpLoc, ExprRange);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002920
Chandler Carruth42ec65d2011-05-26 08:53:16 +00002921 // Whitelist some types as extensions
Richard Trieuccd891a2011-09-09 01:45:06 +00002922 if (!CheckExtensionTraitOperandType(*this, ExprType, OpLoc, ExprRange,
Chandler Carruth42ec65d2011-05-26 08:53:16 +00002923 ExprKind))
Chris Lattner01072922009-01-24 19:46:37 +00002924 return false;
Mike Stump1eb44332009-09-09 15:08:12 +00002925
Richard Trieuccd891a2011-09-09 01:45:06 +00002926 if (RequireCompleteType(OpLoc, ExprType,
Douglas Gregor5cc07df2009-12-15 16:44:32 +00002927 PDiag(diag::err_sizeof_alignof_incomplete_type)
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002928 << ExprKind << ExprRange))
Chris Lattner1efaa952009-04-24 00:30:45 +00002929 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00002930
Richard Trieuccd891a2011-09-09 01:45:06 +00002931 if (CheckObjCTraitOperandConstraints(*this, ExprType, OpLoc, ExprRange,
Chandler Carruth42ec65d2011-05-26 08:53:16 +00002932 ExprKind))
Chris Lattner5cb10d32009-04-24 22:30:50 +00002933 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00002934
Chris Lattner1efaa952009-04-24 00:30:45 +00002935 return false;
Reid Spencer5f016e22007-07-11 17:01:13 +00002936}
2937
Chandler Carruth9d342d02011-05-26 08:53:10 +00002938static bool CheckAlignOfExpr(Sema &S, Expr *E) {
Chris Lattner31e21e02009-01-24 20:17:12 +00002939 E = E->IgnoreParens();
Sebastian Redl28507842009-02-26 14:39:58 +00002940
Mike Stump1eb44332009-09-09 15:08:12 +00002941 // alignof decl is always ok.
Chris Lattner31e21e02009-01-24 20:17:12 +00002942 if (isa<DeclRefExpr>(E))
2943 return false;
Sebastian Redl28507842009-02-26 14:39:58 +00002944
2945 // Cannot know anything else if the expression is dependent.
2946 if (E->isTypeDependent())
2947 return false;
2948
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002949 if (E->getBitField()) {
Chandler Carruth9d342d02011-05-26 08:53:10 +00002950 S.Diag(E->getExprLoc(), diag::err_sizeof_alignof_bitfield)
2951 << 1 << E->getSourceRange();
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002952 return true;
Chris Lattner31e21e02009-01-24 20:17:12 +00002953 }
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002954
2955 // Alignment of a field access is always okay, so long as it isn't a
2956 // bit-field.
2957 if (MemberExpr *ME = dyn_cast<MemberExpr>(E))
Mike Stump8e1fab22009-07-22 18:58:19 +00002958 if (isa<FieldDecl>(ME->getMemberDecl()))
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002959 return false;
2960
Chandler Carruth9d342d02011-05-26 08:53:10 +00002961 return S.CheckUnaryExprOrTypeTraitOperand(E, UETT_AlignOf);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002962}
2963
Chandler Carruth9d342d02011-05-26 08:53:10 +00002964bool Sema::CheckVecStepExpr(Expr *E) {
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002965 E = E->IgnoreParens();
2966
2967 // Cannot know anything else if the expression is dependent.
2968 if (E->isTypeDependent())
2969 return false;
2970
Chandler Carruth9d342d02011-05-26 08:53:10 +00002971 return CheckUnaryExprOrTypeTraitOperand(E, UETT_VecStep);
Chris Lattner31e21e02009-01-24 20:17:12 +00002972}
2973
Douglas Gregorba498172009-03-13 21:01:28 +00002974/// \brief Build a sizeof or alignof expression given a type operand.
John McCall60d7b3a2010-08-24 06:29:42 +00002975ExprResult
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002976Sema::CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
2977 SourceLocation OpLoc,
2978 UnaryExprOrTypeTrait ExprKind,
2979 SourceRange R) {
John McCalla93c9342009-12-07 02:54:59 +00002980 if (!TInfo)
Douglas Gregorba498172009-03-13 21:01:28 +00002981 return ExprError();
2982
John McCalla93c9342009-12-07 02:54:59 +00002983 QualType T = TInfo->getType();
John McCall5ab75172009-11-04 07:28:41 +00002984
Douglas Gregorba498172009-03-13 21:01:28 +00002985 if (!T->isDependentType() &&
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002986 CheckUnaryExprOrTypeTraitOperand(T, OpLoc, R, ExprKind))
Douglas Gregorba498172009-03-13 21:01:28 +00002987 return ExprError();
2988
2989 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00002990 return Owned(new (Context) UnaryExprOrTypeTraitExpr(ExprKind, TInfo,
2991 Context.getSizeType(),
2992 OpLoc, R.getEnd()));
Douglas Gregorba498172009-03-13 21:01:28 +00002993}
2994
2995/// \brief Build a sizeof or alignof expression given an expression
2996/// operand.
John McCall60d7b3a2010-08-24 06:29:42 +00002997ExprResult
Chandler Carruthe72c55b2011-05-29 07:32:14 +00002998Sema::CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
2999 UnaryExprOrTypeTrait ExprKind) {
Douglas Gregor4f0845e2011-06-22 23:21:00 +00003000 ExprResult PE = CheckPlaceholderExpr(E);
3001 if (PE.isInvalid())
3002 return ExprError();
3003
3004 E = PE.get();
3005
Douglas Gregorba498172009-03-13 21:01:28 +00003006 // Verify that the operand is valid.
3007 bool isInvalid = false;
3008 if (E->isTypeDependent()) {
3009 // Delay type-checking for type-dependent expressions.
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003010 } else if (ExprKind == UETT_AlignOf) {
Chandler Carruth9d342d02011-05-26 08:53:10 +00003011 isInvalid = CheckAlignOfExpr(*this, E);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003012 } else if (ExprKind == UETT_VecStep) {
Chandler Carruth9d342d02011-05-26 08:53:10 +00003013 isInvalid = CheckVecStepExpr(E);
Douglas Gregor33bbbc52009-05-02 02:18:30 +00003014 } else if (E->getBitField()) { // C99 6.5.3.4p1.
Chandler Carruth9d342d02011-05-26 08:53:10 +00003015 Diag(E->getExprLoc(), diag::err_sizeof_alignof_bitfield) << 0;
Douglas Gregorba498172009-03-13 21:01:28 +00003016 isInvalid = true;
3017 } else {
Chandler Carruth9d342d02011-05-26 08:53:10 +00003018 isInvalid = CheckUnaryExprOrTypeTraitOperand(E, UETT_SizeOf);
Douglas Gregorba498172009-03-13 21:01:28 +00003019 }
3020
3021 if (isInvalid)
3022 return ExprError();
3023
3024 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
Chandler Carruth9d342d02011-05-26 08:53:10 +00003025 return Owned(new (Context) UnaryExprOrTypeTraitExpr(
Chandler Carruthe72c55b2011-05-29 07:32:14 +00003026 ExprKind, E, Context.getSizeType(), OpLoc,
Chandler Carruth9d342d02011-05-26 08:53:10 +00003027 E->getSourceRange().getEnd()));
Douglas Gregorba498172009-03-13 21:01:28 +00003028}
3029
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003030/// ActOnUnaryExprOrTypeTraitExpr - Handle @c sizeof(type) and @c sizeof @c
3031/// expr and the same for @c alignof and @c __alignof
Sebastian Redl05189992008-11-11 17:56:53 +00003032/// Note that the ArgRange is invalid if isType is false.
John McCall60d7b3a2010-08-24 06:29:42 +00003033ExprResult
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003034Sema::ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00003035 UnaryExprOrTypeTrait ExprKind, bool IsType,
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003036 void *TyOrEx, const SourceRange &ArgRange) {
Reid Spencer5f016e22007-07-11 17:01:13 +00003037 // If error parsing type, ignore.
Sebastian Redl0eb23302009-01-19 00:08:26 +00003038 if (TyOrEx == 0) return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00003039
Richard Trieuccd891a2011-09-09 01:45:06 +00003040 if (IsType) {
John McCalla93c9342009-12-07 02:54:59 +00003041 TypeSourceInfo *TInfo;
John McCallb3d87482010-08-24 05:47:05 +00003042 (void) GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrEx), &TInfo);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00003043 return CreateUnaryExprOrTypeTraitExpr(TInfo, OpLoc, ExprKind, ArgRange);
Mike Stump1eb44332009-09-09 15:08:12 +00003044 }
Sebastian Redl05189992008-11-11 17:56:53 +00003045
Douglas Gregorba498172009-03-13 21:01:28 +00003046 Expr *ArgEx = (Expr *)TyOrEx;
Chandler Carruthe72c55b2011-05-29 07:32:14 +00003047 ExprResult Result = CreateUnaryExprOrTypeTraitExpr(ArgEx, OpLoc, ExprKind);
Douglas Gregorba498172009-03-13 21:01:28 +00003048 return move(Result);
Reid Spencer5f016e22007-07-11 17:01:13 +00003049}
3050
John Wiegley429bb272011-04-08 18:41:53 +00003051static QualType CheckRealImagOperand(Sema &S, ExprResult &V, SourceLocation Loc,
Richard Trieuccd891a2011-09-09 01:45:06 +00003052 bool IsReal) {
John Wiegley429bb272011-04-08 18:41:53 +00003053 if (V.get()->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00003054 return S.Context.DependentTy;
Mike Stump1eb44332009-09-09 15:08:12 +00003055
John McCallf6a16482010-12-04 03:47:34 +00003056 // _Real and _Imag are only l-values for normal l-values.
John Wiegley429bb272011-04-08 18:41:53 +00003057 if (V.get()->getObjectKind() != OK_Ordinary) {
3058 V = S.DefaultLvalueConversion(V.take());
3059 if (V.isInvalid())
3060 return QualType();
3061 }
John McCallf6a16482010-12-04 03:47:34 +00003062
Chris Lattnercc26ed72007-08-26 05:39:26 +00003063 // These operators return the element type of a complex type.
John Wiegley429bb272011-04-08 18:41:53 +00003064 if (const ComplexType *CT = V.get()->getType()->getAs<ComplexType>())
Chris Lattnerdbb36972007-08-24 21:16:53 +00003065 return CT->getElementType();
Mike Stump1eb44332009-09-09 15:08:12 +00003066
Chris Lattnercc26ed72007-08-26 05:39:26 +00003067 // Otherwise they pass through real integer and floating point types here.
John Wiegley429bb272011-04-08 18:41:53 +00003068 if (V.get()->getType()->isArithmeticType())
3069 return V.get()->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00003070
John McCall2cd11fe2010-10-12 02:09:17 +00003071 // Test for placeholders.
John McCallfb8721c2011-04-10 19:13:55 +00003072 ExprResult PR = S.CheckPlaceholderExpr(V.get());
John McCall2cd11fe2010-10-12 02:09:17 +00003073 if (PR.isInvalid()) return QualType();
John Wiegley429bb272011-04-08 18:41:53 +00003074 if (PR.get() != V.get()) {
3075 V = move(PR);
Richard Trieuccd891a2011-09-09 01:45:06 +00003076 return CheckRealImagOperand(S, V, Loc, IsReal);
John McCall2cd11fe2010-10-12 02:09:17 +00003077 }
3078
Chris Lattnercc26ed72007-08-26 05:39:26 +00003079 // Reject anything else.
John Wiegley429bb272011-04-08 18:41:53 +00003080 S.Diag(Loc, diag::err_realimag_invalid_type) << V.get()->getType()
Richard Trieuccd891a2011-09-09 01:45:06 +00003081 << (IsReal ? "__real" : "__imag");
Chris Lattnercc26ed72007-08-26 05:39:26 +00003082 return QualType();
Chris Lattnerdbb36972007-08-24 21:16:53 +00003083}
3084
3085
Reid Spencer5f016e22007-07-11 17:01:13 +00003086
John McCall60d7b3a2010-08-24 06:29:42 +00003087ExprResult
Sebastian Redl0eb23302009-01-19 00:08:26 +00003088Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
John McCall9ae2f072010-08-23 23:25:46 +00003089 tok::TokenKind Kind, Expr *Input) {
John McCall2de56d12010-08-25 11:45:40 +00003090 UnaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00003091 switch (Kind) {
David Blaikieb219cfc2011-09-23 05:06:16 +00003092 default: llvm_unreachable("Unknown unary op!");
John McCall2de56d12010-08-25 11:45:40 +00003093 case tok::plusplus: Opc = UO_PostInc; break;
3094 case tok::minusminus: Opc = UO_PostDec; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00003095 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00003096
John McCall9ae2f072010-08-23 23:25:46 +00003097 return BuildUnaryOp(S, OpLoc, Opc, Input);
Reid Spencer5f016e22007-07-11 17:01:13 +00003098}
3099
John McCall60d7b3a2010-08-24 06:29:42 +00003100ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003101Sema::ActOnArraySubscriptExpr(Scope *S, Expr *Base, SourceLocation LLoc,
3102 Expr *Idx, SourceLocation RLoc) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00003103 // Since this might be a postfix expression, get rid of ParenListExprs.
John McCall60d7b3a2010-08-24 06:29:42 +00003104 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
John McCall9ae2f072010-08-23 23:25:46 +00003105 if (Result.isInvalid()) return ExprError();
3106 Base = Result.take();
Nate Begeman2ef13e52009-08-10 23:49:36 +00003107
John McCall9ae2f072010-08-23 23:25:46 +00003108 Expr *LHSExp = Base, *RHSExp = Idx;
Mike Stump1eb44332009-09-09 15:08:12 +00003109
Douglas Gregor337c6b92008-11-19 17:17:41 +00003110 if (getLangOptions().CPlusPlus &&
Douglas Gregor3384c9c2009-05-19 00:01:19 +00003111 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) {
Douglas Gregor3384c9c2009-05-19 00:01:19 +00003112 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
John McCallf89e55a2010-11-18 06:31:45 +00003113 Context.DependentTy,
3114 VK_LValue, OK_Ordinary,
3115 RLoc));
Douglas Gregor3384c9c2009-05-19 00:01:19 +00003116 }
3117
Mike Stump1eb44332009-09-09 15:08:12 +00003118 if (getLangOptions().CPlusPlus &&
Sebastian Redl0eb23302009-01-19 00:08:26 +00003119 (LHSExp->getType()->isRecordType() ||
Eli Friedman03f332a2008-12-15 22:34:21 +00003120 LHSExp->getType()->isEnumeralType() ||
3121 RHSExp->getType()->isRecordType() ||
3122 RHSExp->getType()->isEnumeralType())) {
John McCall9ae2f072010-08-23 23:25:46 +00003123 return CreateOverloadedArraySubscriptExpr(LLoc, RLoc, Base, Idx);
Douglas Gregor337c6b92008-11-19 17:17:41 +00003124 }
3125
John McCall9ae2f072010-08-23 23:25:46 +00003126 return CreateBuiltinArraySubscriptExpr(Base, LLoc, Idx, RLoc);
Sebastian Redlf322ed62009-10-29 20:17:01 +00003127}
3128
3129
John McCall60d7b3a2010-08-24 06:29:42 +00003130ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003131Sema::CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00003132 Expr *Idx, SourceLocation RLoc) {
John McCall9ae2f072010-08-23 23:25:46 +00003133 Expr *LHSExp = Base;
3134 Expr *RHSExp = Idx;
Sebastian Redlf322ed62009-10-29 20:17:01 +00003135
Chris Lattner12d9ff62007-07-16 00:14:47 +00003136 // Perform default conversions.
John Wiegley429bb272011-04-08 18:41:53 +00003137 if (!LHSExp->getType()->getAs<VectorType>()) {
3138 ExprResult Result = DefaultFunctionArrayLvalueConversion(LHSExp);
3139 if (Result.isInvalid())
3140 return ExprError();
3141 LHSExp = Result.take();
3142 }
3143 ExprResult Result = DefaultFunctionArrayLvalueConversion(RHSExp);
3144 if (Result.isInvalid())
3145 return ExprError();
3146 RHSExp = Result.take();
Sebastian Redl0eb23302009-01-19 00:08:26 +00003147
Chris Lattner12d9ff62007-07-16 00:14:47 +00003148 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType();
John McCallf89e55a2010-11-18 06:31:45 +00003149 ExprValueKind VK = VK_LValue;
3150 ExprObjectKind OK = OK_Ordinary;
Reid Spencer5f016e22007-07-11 17:01:13 +00003151
Reid Spencer5f016e22007-07-11 17:01:13 +00003152 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent
Chris Lattner73d0d4f2007-08-30 17:45:32 +00003153 // to the expression *((e1)+(e2)). This means the array "Base" may actually be
Mike Stumpeed9cac2009-02-19 03:04:26 +00003154 // in the subscript position. As a result, we need to derive the array base
Reid Spencer5f016e22007-07-11 17:01:13 +00003155 // and index from the expression types.
Chris Lattner12d9ff62007-07-16 00:14:47 +00003156 Expr *BaseExpr, *IndexExpr;
3157 QualType ResultType;
Sebastian Redl28507842009-02-26 14:39:58 +00003158 if (LHSTy->isDependentType() || RHSTy->isDependentType()) {
3159 BaseExpr = LHSExp;
3160 IndexExpr = RHSExp;
3161 ResultType = Context.DependentTy;
Ted Kremenek6217b802009-07-29 21:53:49 +00003162 } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) {
Chris Lattner12d9ff62007-07-16 00:14:47 +00003163 BaseExpr = LHSExp;
3164 IndexExpr = RHSExp;
Chris Lattner12d9ff62007-07-16 00:14:47 +00003165 ResultType = PTy->getPointeeType();
Ted Kremenek6217b802009-07-29 21:53:49 +00003166 } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) {
Chris Lattner7a2e0472007-07-16 00:23:25 +00003167 // Handle the uncommon case of "123[Ptr]".
Chris Lattner12d9ff62007-07-16 00:14:47 +00003168 BaseExpr = RHSExp;
3169 IndexExpr = LHSExp;
Chris Lattner12d9ff62007-07-16 00:14:47 +00003170 ResultType = PTy->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00003171 } else if (const ObjCObjectPointerType *PTy =
John McCall183700f2009-09-21 23:43:11 +00003172 LHSTy->getAs<ObjCObjectPointerType>()) {
Steve Naroff14108da2009-07-10 23:34:53 +00003173 BaseExpr = LHSExp;
3174 IndexExpr = RHSExp;
3175 ResultType = PTy->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00003176 } else if (const ObjCObjectPointerType *PTy =
John McCall183700f2009-09-21 23:43:11 +00003177 RHSTy->getAs<ObjCObjectPointerType>()) {
Steve Naroff14108da2009-07-10 23:34:53 +00003178 // Handle the uncommon case of "123[Ptr]".
3179 BaseExpr = RHSExp;
3180 IndexExpr = LHSExp;
3181 ResultType = PTy->getPointeeType();
John McCall183700f2009-09-21 23:43:11 +00003182 } else if (const VectorType *VTy = LHSTy->getAs<VectorType>()) {
Chris Lattnerc8629632007-07-31 19:29:30 +00003183 BaseExpr = LHSExp; // vectors: V[123]
Chris Lattner12d9ff62007-07-16 00:14:47 +00003184 IndexExpr = RHSExp;
John McCallf89e55a2010-11-18 06:31:45 +00003185 VK = LHSExp->getValueKind();
3186 if (VK != VK_RValue)
3187 OK = OK_VectorComponent;
Nate Begeman334a8022009-01-18 00:45:31 +00003188
Chris Lattner12d9ff62007-07-16 00:14:47 +00003189 // FIXME: need to deal with const...
3190 ResultType = VTy->getElementType();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003191 } else if (LHSTy->isArrayType()) {
3192 // If we see an array that wasn't promoted by
Douglas Gregora873dfc2010-02-03 00:27:59 +00003193 // DefaultFunctionArrayLvalueConversion, it must be an array that
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003194 // wasn't promoted because of the C90 rule that doesn't
3195 // allow promoting non-lvalue arrays. Warn, then
3196 // force the promotion here.
3197 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
3198 LHSExp->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00003199 LHSExp = ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy),
3200 CK_ArrayToPointerDecay).take();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003201 LHSTy = LHSExp->getType();
3202
3203 BaseExpr = LHSExp;
3204 IndexExpr = RHSExp;
Ted Kremenek6217b802009-07-29 21:53:49 +00003205 ResultType = LHSTy->getAs<PointerType>()->getPointeeType();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003206 } else if (RHSTy->isArrayType()) {
3207 // Same as previous, except for 123[f().a] case
3208 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
3209 RHSExp->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00003210 RHSExp = ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy),
3211 CK_ArrayToPointerDecay).take();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00003212 RHSTy = RHSExp->getType();
3213
3214 BaseExpr = RHSExp;
3215 IndexExpr = LHSExp;
Ted Kremenek6217b802009-07-29 21:53:49 +00003216 ResultType = RHSTy->getAs<PointerType>()->getPointeeType();
Reid Spencer5f016e22007-07-11 17:01:13 +00003217 } else {
Chris Lattner338395d2009-04-25 22:50:55 +00003218 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value)
3219 << LHSExp->getSourceRange() << RHSExp->getSourceRange());
Sebastian Redl0eb23302009-01-19 00:08:26 +00003220 }
Reid Spencer5f016e22007-07-11 17:01:13 +00003221 // C99 6.5.2.1p1
Douglas Gregorf6094622010-07-23 15:58:24 +00003222 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent())
Chris Lattner338395d2009-04-25 22:50:55 +00003223 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer)
3224 << IndexExpr->getSourceRange());
Reid Spencer5f016e22007-07-11 17:01:13 +00003225
Daniel Dunbar7e88a602009-09-17 06:31:17 +00003226 if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
Sam Weinig0f9a5b52009-09-14 20:14:57 +00003227 IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
3228 && !IndexExpr->isTypeDependent())
Sam Weinig76e2b712009-09-14 01:58:58 +00003229 Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange();
3230
Douglas Gregore7450f52009-03-24 19:52:54 +00003231 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
Mike Stump1eb44332009-09-09 15:08:12 +00003232 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object
3233 // type. Note that Functions are not objects, and that (in C99 parlance)
Douglas Gregore7450f52009-03-24 19:52:54 +00003234 // incomplete types are not object types.
3235 if (ResultType->isFunctionType()) {
3236 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type)
3237 << ResultType << BaseExpr->getSourceRange();
3238 return ExprError();
3239 }
Mike Stump1eb44332009-09-09 15:08:12 +00003240
Abramo Bagnara46358452010-09-13 06:50:07 +00003241 if (ResultType->isVoidType() && !getLangOptions().CPlusPlus) {
3242 // GNU extension: subscripting on pointer to void
Chandler Carruth66289692011-06-27 16:32:27 +00003243 Diag(LLoc, diag::ext_gnu_subscript_void_type)
3244 << BaseExpr->getSourceRange();
John McCall09431682010-11-18 19:01:18 +00003245
3246 // C forbids expressions of unqualified void type from being l-values.
3247 // See IsCForbiddenLValueType.
3248 if (!ResultType.hasQualifiers()) VK = VK_RValue;
Abramo Bagnara46358452010-09-13 06:50:07 +00003249 } else if (!ResultType->isDependentType() &&
Mike Stump1eb44332009-09-09 15:08:12 +00003250 RequireCompleteType(LLoc, ResultType,
Anders Carlssonb7906612009-08-26 23:45:07 +00003251 PDiag(diag::err_subscript_incomplete_type)
3252 << BaseExpr->getSourceRange()))
Douglas Gregore7450f52009-03-24 19:52:54 +00003253 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00003254
Chris Lattner1efaa952009-04-24 00:30:45 +00003255 // Diagnose bad cases where we step over interface counts.
John McCallc12c5bb2010-05-15 11:32:37 +00003256 if (ResultType->isObjCObjectType() && LangOpts.ObjCNonFragileABI) {
Chris Lattner1efaa952009-04-24 00:30:45 +00003257 Diag(LLoc, diag::err_subscript_nonfragile_interface)
3258 << ResultType << BaseExpr->getSourceRange();
3259 return ExprError();
3260 }
Mike Stump1eb44332009-09-09 15:08:12 +00003261
John McCall09431682010-11-18 19:01:18 +00003262 assert(VK == VK_RValue || LangOpts.CPlusPlus ||
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00003263 !ResultType.isCForbiddenLValueType());
John McCall09431682010-11-18 19:01:18 +00003264
Mike Stumpeed9cac2009-02-19 03:04:26 +00003265 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
John McCallf89e55a2010-11-18 06:31:45 +00003266 ResultType, VK, OK, RLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00003267}
3268
John McCall60d7b3a2010-08-24 06:29:42 +00003269ExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc,
Nico Weber08e41a62010-11-29 18:19:25 +00003270 FunctionDecl *FD,
3271 ParmVarDecl *Param) {
Anders Carlsson56c5e332009-08-25 03:49:14 +00003272 if (Param->hasUnparsedDefaultArg()) {
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003273 Diag(CallLoc,
Nico Weber15d5c832010-11-30 04:44:33 +00003274 diag::err_use_of_default_argument_to_function_declared_later) <<
Anders Carlsson56c5e332009-08-25 03:49:14 +00003275 FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName();
Mike Stump1eb44332009-09-09 15:08:12 +00003276 Diag(UnparsedDefaultArgLocs[Param],
Nico Weber15d5c832010-11-30 04:44:33 +00003277 diag::note_default_argument_declared_here);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003278 return ExprError();
3279 }
3280
3281 if (Param->hasUninstantiatedDefaultArg()) {
3282 Expr *UninstExpr = Param->getUninstantiatedDefaultArg();
Anders Carlsson56c5e332009-08-25 03:49:14 +00003283
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003284 // Instantiate the expression.
3285 MultiLevelTemplateArgumentList ArgList
3286 = getTemplateInstantiationArgs(FD, 0, /*RelativeToPrimary=*/true);
Anders Carlsson25cae7f2009-09-05 05:14:19 +00003287
Nico Weber08e41a62010-11-29 18:19:25 +00003288 std::pair<const TemplateArgument *, unsigned> Innermost
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003289 = ArgList.getInnermost();
3290 InstantiatingTemplate Inst(*this, CallLoc, Param, Innermost.first,
3291 Innermost.second);
Anders Carlsson56c5e332009-08-25 03:49:14 +00003292
Nico Weber08e41a62010-11-29 18:19:25 +00003293 ExprResult Result;
3294 {
3295 // C++ [dcl.fct.default]p5:
3296 // The names in the [default argument] expression are bound, and
3297 // the semantic constraints are checked, at the point where the
3298 // default argument expression appears.
Nico Weber15d5c832010-11-30 04:44:33 +00003299 ContextRAII SavedContext(*this, FD);
Nico Weber08e41a62010-11-29 18:19:25 +00003300 Result = SubstExpr(UninstExpr, ArgList);
3301 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003302 if (Result.isInvalid())
3303 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00003304
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003305 // Check the expression as an initializer for the parameter.
3306 InitializedEntity Entity
Fariborz Jahanian745da3a2010-09-24 17:30:16 +00003307 = InitializedEntity::InitializeParameter(Context, Param);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003308 InitializationKind Kind
3309 = InitializationKind::CreateCopy(Param->getLocation(),
3310 /*FIXME:EqualLoc*/UninstExpr->getSourceRange().getBegin());
3311 Expr *ResultE = Result.takeAs<Expr>();
Douglas Gregor65222e82009-12-23 18:19:08 +00003312
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003313 InitializationSequence InitSeq(*this, Entity, Kind, &ResultE, 1);
3314 Result = InitSeq.Perform(*this, Entity, Kind,
3315 MultiExprArg(*this, &ResultE, 1));
3316 if (Result.isInvalid())
3317 return ExprError();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003318
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003319 // Build the default argument expression.
3320 return Owned(CXXDefaultArgExpr::Create(Context, CallLoc, Param,
3321 Result.takeAs<Expr>()));
Anders Carlsson56c5e332009-08-25 03:49:14 +00003322 }
3323
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003324 // If the default expression creates temporaries, we need to
3325 // push them to the current stack of expression temporaries so they'll
3326 // be properly destroyed.
3327 // FIXME: We should really be rebuilding the default argument with new
3328 // bound temporaries; see the comment in PR5810.
John McCall80ee6e82011-11-10 05:35:25 +00003329 // We don't need to do that with block decls, though, because
3330 // blocks in default argument expression can never capture anything.
3331 if (isa<ExprWithCleanups>(Param->getInit())) {
3332 // Set the "needs cleanups" bit regardless of whether there are
3333 // any explicit objects.
John McCallf85e1932011-06-15 23:02:42 +00003334 ExprNeedsCleanups = true;
John McCall80ee6e82011-11-10 05:35:25 +00003335
3336 // Append all the objects to the cleanup list. Right now, this
3337 // should always be a no-op, because blocks in default argument
3338 // expressions should never be able to capture anything.
3339 assert(!cast<ExprWithCleanups>(Param->getInit())->getNumObjects() &&
3340 "default argument expression has capturing blocks?");
Douglas Gregor5833b0b2010-09-14 22:55:20 +00003341 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003342
3343 // We already type-checked the argument, so we know it works.
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00003344 // Just mark all of the declarations in this potentially-evaluated expression
3345 // as being "referenced".
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003346 MarkDeclarationsReferencedInExpr(Param->getDefaultArg());
Douglas Gregor036aed12009-12-23 23:03:06 +00003347 return Owned(CXXDefaultArgExpr::Create(Context, CallLoc, Param));
Anders Carlsson56c5e332009-08-25 03:49:14 +00003348}
3349
Douglas Gregor88a35142008-12-22 05:46:06 +00003350/// ConvertArgumentsForCall - Converts the arguments specified in
3351/// Args/NumArgs to the parameter types of the function FDecl with
3352/// function prototype Proto. Call is the call expression itself, and
3353/// Fn is the function expression. For a C++ member function, this
3354/// routine does not attempt to convert the object argument. Returns
3355/// true if the call is ill-formed.
Mike Stumpeed9cac2009-02-19 03:04:26 +00003356bool
3357Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
Douglas Gregor88a35142008-12-22 05:46:06 +00003358 FunctionDecl *FDecl,
Douglas Gregor72564e72009-02-26 23:50:07 +00003359 const FunctionProtoType *Proto,
Douglas Gregor88a35142008-12-22 05:46:06 +00003360 Expr **Args, unsigned NumArgs,
Peter Collingbourne1f240762011-10-02 23:49:29 +00003361 SourceLocation RParenLoc,
3362 bool IsExecConfig) {
John McCall8e10f3b2011-02-26 05:39:39 +00003363 // Bail out early if calling a builtin with custom typechecking.
3364 // We don't need to do this in the
3365 if (FDecl)
3366 if (unsigned ID = FDecl->getBuiltinID())
3367 if (Context.BuiltinInfo.hasCustomTypechecking(ID))
3368 return false;
3369
Mike Stumpeed9cac2009-02-19 03:04:26 +00003370 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by
Douglas Gregor88a35142008-12-22 05:46:06 +00003371 // assignment, to the types of the corresponding parameter, ...
3372 unsigned NumArgsInProto = Proto->getNumArgs();
Douglas Gregor3fd56d72009-01-23 21:30:56 +00003373 bool Invalid = false;
Peter Collingbourneaf15b4d2011-10-02 23:49:20 +00003374 unsigned MinArgs = FDecl ? FDecl->getMinRequiredArguments() : NumArgsInProto;
Peter Collingbourne1f240762011-10-02 23:49:29 +00003375 unsigned FnKind = Fn->getType()->isBlockPointerType()
3376 ? 1 /* block */
3377 : (IsExecConfig ? 3 /* kernel function (exec config) */
3378 : 0 /* function */);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003379
Douglas Gregor88a35142008-12-22 05:46:06 +00003380 // If too few arguments are available (and we don't have default
3381 // arguments for the remaining parameters), don't make the call.
3382 if (NumArgs < NumArgsInProto) {
Peter Collingbourneaf15b4d2011-10-02 23:49:20 +00003383 if (NumArgs < MinArgs) {
3384 Diag(RParenLoc, MinArgs == NumArgsInProto
3385 ? diag::err_typecheck_call_too_few_args
3386 : diag::err_typecheck_call_too_few_args_at_least)
Peter Collingbourne1f240762011-10-02 23:49:29 +00003387 << FnKind
Peter Collingbourneaf15b4d2011-10-02 23:49:20 +00003388 << MinArgs << NumArgs << Fn->getSourceRange();
Peter Collingbourne9aab1482011-07-29 00:24:42 +00003389
3390 // Emit the location of the prototype.
Peter Collingbourne1f240762011-10-02 23:49:29 +00003391 if (FDecl && !FDecl->getBuiltinID() && !IsExecConfig)
Peter Collingbourne9aab1482011-07-29 00:24:42 +00003392 Diag(FDecl->getLocStart(), diag::note_callee_decl)
3393 << FDecl;
3394
3395 return true;
3396 }
Ted Kremenek8189cde2009-02-07 01:47:29 +00003397 Call->setNumArgs(Context, NumArgsInProto);
Douglas Gregor88a35142008-12-22 05:46:06 +00003398 }
3399
3400 // If too many are passed and not variadic, error on the extras and drop
3401 // them.
3402 if (NumArgs > NumArgsInProto) {
3403 if (!Proto->isVariadic()) {
3404 Diag(Args[NumArgsInProto]->getLocStart(),
Peter Collingbourneaf15b4d2011-10-02 23:49:20 +00003405 MinArgs == NumArgsInProto
3406 ? diag::err_typecheck_call_too_many_args
3407 : diag::err_typecheck_call_too_many_args_at_most)
Peter Collingbourne1f240762011-10-02 23:49:29 +00003408 << FnKind
Eric Christopherccfa9632010-04-16 04:56:46 +00003409 << NumArgsInProto << NumArgs << Fn->getSourceRange()
Douglas Gregor88a35142008-12-22 05:46:06 +00003410 << SourceRange(Args[NumArgsInProto]->getLocStart(),
3411 Args[NumArgs-1]->getLocEnd());
Ted Kremenek5862f0e2011-04-04 17:22:27 +00003412
3413 // Emit the location of the prototype.
Peter Collingbourne1f240762011-10-02 23:49:29 +00003414 if (FDecl && !FDecl->getBuiltinID() && !IsExecConfig)
Peter Collingbourne9aab1482011-07-29 00:24:42 +00003415 Diag(FDecl->getLocStart(), diag::note_callee_decl)
3416 << FDecl;
Ted Kremenek5862f0e2011-04-04 17:22:27 +00003417
Douglas Gregor88a35142008-12-22 05:46:06 +00003418 // This deletes the extra arguments.
Ted Kremenek8189cde2009-02-07 01:47:29 +00003419 Call->setNumArgs(Context, NumArgsInProto);
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003420 return true;
Douglas Gregor88a35142008-12-22 05:46:06 +00003421 }
Douglas Gregor88a35142008-12-22 05:46:06 +00003422 }
Chris Lattner5f9e2722011-07-23 10:55:15 +00003423 SmallVector<Expr *, 8> AllArgs;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003424 VariadicCallType CallType =
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00003425 Proto->isVariadic() ? VariadicFunction : VariadicDoesNotApply;
3426 if (Fn->getType()->isBlockPointerType())
3427 CallType = VariadicBlock; // Block
3428 else if (isa<MemberExpr>(Fn))
3429 CallType = VariadicMethod;
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003430 Invalid = GatherArgumentsForCall(Call->getSourceRange().getBegin(), FDecl,
Fariborz Jahanian2fe168f2009-11-24 21:37:28 +00003431 Proto, 0, Args, NumArgs, AllArgs, CallType);
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003432 if (Invalid)
3433 return true;
3434 unsigned TotalNumArgs = AllArgs.size();
3435 for (unsigned i = 0; i < TotalNumArgs; ++i)
3436 Call->setArg(i, AllArgs[i]);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003437
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003438 return false;
3439}
Mike Stumpeed9cac2009-02-19 03:04:26 +00003440
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003441bool Sema::GatherArgumentsForCall(SourceLocation CallLoc,
3442 FunctionDecl *FDecl,
3443 const FunctionProtoType *Proto,
3444 unsigned FirstProtoArg,
3445 Expr **Args, unsigned NumArgs,
Chris Lattner5f9e2722011-07-23 10:55:15 +00003446 SmallVector<Expr *, 8> &AllArgs,
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00003447 VariadicCallType CallType) {
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003448 unsigned NumArgsInProto = Proto->getNumArgs();
3449 unsigned NumArgsToCheck = NumArgs;
3450 bool Invalid = false;
3451 if (NumArgs != NumArgsInProto)
3452 // Use default arguments for missing arguments
3453 NumArgsToCheck = NumArgsInProto;
3454 unsigned ArgIx = 0;
Douglas Gregor88a35142008-12-22 05:46:06 +00003455 // Continue to check argument types (even if we have too few/many args).
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003456 for (unsigned i = FirstProtoArg; i != NumArgsToCheck; i++) {
Douglas Gregor88a35142008-12-22 05:46:06 +00003457 QualType ProtoArgType = Proto->getArgType(i);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003458
Douglas Gregor88a35142008-12-22 05:46:06 +00003459 Expr *Arg;
Peter Collingbourne013e5ce2011-10-19 00:16:45 +00003460 ParmVarDecl *Param;
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003461 if (ArgIx < NumArgs) {
3462 Arg = Args[ArgIx++];
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003463
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00003464 if (RequireCompleteType(Arg->getSourceRange().getBegin(),
3465 ProtoArgType,
Anders Carlssonb7906612009-08-26 23:45:07 +00003466 PDiag(diag::err_call_incomplete_argument)
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003467 << Arg->getSourceRange()))
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00003468 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003469
Douglas Gregora188ff22009-12-22 16:09:06 +00003470 // Pass the argument
Peter Collingbourne013e5ce2011-10-19 00:16:45 +00003471 Param = 0;
Douglas Gregora188ff22009-12-22 16:09:06 +00003472 if (FDecl && i < FDecl->getNumParams())
3473 Param = FDecl->getParamDecl(i);
Douglas Gregoraa037312009-12-22 07:24:36 +00003474
John McCall5acb0c92011-10-17 18:40:02 +00003475 // Strip the unbridged-cast placeholder expression off, if applicable.
3476 if (Arg->getType() == Context.ARCUnbridgedCastTy &&
3477 FDecl && FDecl->hasAttr<CFAuditedTransferAttr>() &&
3478 (!Param || !Param->hasAttr<CFConsumedAttr>()))
3479 Arg = stripARCUnbridgedCast(Arg);
3480
Douglas Gregora188ff22009-12-22 16:09:06 +00003481 InitializedEntity Entity =
Fariborz Jahanian745da3a2010-09-24 17:30:16 +00003482 Param? InitializedEntity::InitializeParameter(Context, Param)
John McCallf85e1932011-06-15 23:02:42 +00003483 : InitializedEntity::InitializeParameter(Context, ProtoArgType,
3484 Proto->isArgConsumed(i));
John McCall60d7b3a2010-08-24 06:29:42 +00003485 ExprResult ArgE = PerformCopyInitialization(Entity,
John McCallf6a16482010-12-04 03:47:34 +00003486 SourceLocation(),
3487 Owned(Arg));
Douglas Gregora188ff22009-12-22 16:09:06 +00003488 if (ArgE.isInvalid())
3489 return true;
3490
3491 Arg = ArgE.takeAs<Expr>();
Anders Carlsson5e300d12009-06-12 16:51:40 +00003492 } else {
Peter Collingbourne013e5ce2011-10-19 00:16:45 +00003493 Param = FDecl->getParamDecl(i);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003494
John McCall60d7b3a2010-08-24 06:29:42 +00003495 ExprResult ArgExpr =
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003496 BuildCXXDefaultArgExpr(CallLoc, FDecl, Param);
Anders Carlsson56c5e332009-08-25 03:49:14 +00003497 if (ArgExpr.isInvalid())
3498 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003499
Anders Carlsson56c5e332009-08-25 03:49:14 +00003500 Arg = ArgExpr.takeAs<Expr>();
Anders Carlsson5e300d12009-06-12 16:51:40 +00003501 }
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00003502
3503 // Check for array bounds violations for each argument to the call. This
3504 // check only triggers warnings when the argument isn't a more complex Expr
3505 // with its own checking, such as a BinaryOperator.
3506 CheckArrayAccess(Arg);
3507
Peter Collingbourne013e5ce2011-10-19 00:16:45 +00003508 // Check for violations of C99 static array rules (C99 6.7.5.3p7).
3509 CheckStaticArrayArgument(CallLoc, Param, Arg);
3510
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003511 AllArgs.push_back(Arg);
Douglas Gregor88a35142008-12-22 05:46:06 +00003512 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003513
Douglas Gregor88a35142008-12-22 05:46:06 +00003514 // If this is a variadic call, handle args passed through "...".
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00003515 if (CallType != VariadicDoesNotApply) {
John McCall755d8492011-04-12 00:42:48 +00003516
3517 // Assume that extern "C" functions with variadic arguments that
3518 // return __unknown_anytype aren't *really* variadic.
3519 if (Proto->getResultType() == Context.UnknownAnyTy &&
3520 FDecl && FDecl->isExternC()) {
3521 for (unsigned i = ArgIx; i != NumArgs; ++i) {
3522 ExprResult arg;
3523 if (isa<ExplicitCastExpr>(Args[i]->IgnoreParens()))
3524 arg = DefaultFunctionArrayLvalueConversion(Args[i]);
3525 else
3526 arg = DefaultVariadicArgumentPromotion(Args[i], CallType, FDecl);
3527 Invalid |= arg.isInvalid();
3528 AllArgs.push_back(arg.take());
3529 }
3530
3531 // Otherwise do argument promotion, (C99 6.5.2.2p7).
3532 } else {
3533 for (unsigned i = ArgIx; i != NumArgs; ++i) {
Richard Trieu67e29332011-08-02 04:35:43 +00003534 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], CallType,
3535 FDecl);
John McCall755d8492011-04-12 00:42:48 +00003536 Invalid |= Arg.isInvalid();
3537 AllArgs.push_back(Arg.take());
3538 }
Douglas Gregor88a35142008-12-22 05:46:06 +00003539 }
Ted Kremenek615eb7c2011-09-26 23:36:13 +00003540
3541 // Check for array bounds violations.
3542 for (unsigned i = ArgIx; i != NumArgs; ++i)
3543 CheckArrayAccess(Args[i]);
Douglas Gregor88a35142008-12-22 05:46:06 +00003544 }
Douglas Gregor3fd56d72009-01-23 21:30:56 +00003545 return Invalid;
Douglas Gregor88a35142008-12-22 05:46:06 +00003546}
3547
Peter Collingbourne013e5ce2011-10-19 00:16:45 +00003548static void DiagnoseCalleeStaticArrayParam(Sema &S, ParmVarDecl *PVD) {
3549 TypeLoc TL = PVD->getTypeSourceInfo()->getTypeLoc();
3550 if (ArrayTypeLoc *ATL = dyn_cast<ArrayTypeLoc>(&TL))
3551 S.Diag(PVD->getLocation(), diag::note_callee_static_array)
3552 << ATL->getLocalSourceRange();
3553}
3554
3555/// CheckStaticArrayArgument - If the given argument corresponds to a static
3556/// array parameter, check that it is non-null, and that if it is formed by
3557/// array-to-pointer decay, the underlying array is sufficiently large.
3558///
3559/// C99 6.7.5.3p7: If the keyword static also appears within the [ and ] of the
3560/// array type derivation, then for each call to the function, the value of the
3561/// corresponding actual argument shall provide access to the first element of
3562/// an array with at least as many elements as specified by the size expression.
3563void
3564Sema::CheckStaticArrayArgument(SourceLocation CallLoc,
3565 ParmVarDecl *Param,
3566 const Expr *ArgExpr) {
3567 // Static array parameters are not supported in C++.
3568 if (!Param || getLangOptions().CPlusPlus)
3569 return;
3570
3571 QualType OrigTy = Param->getOriginalType();
3572
3573 const ArrayType *AT = Context.getAsArrayType(OrigTy);
3574 if (!AT || AT->getSizeModifier() != ArrayType::Static)
3575 return;
3576
3577 if (ArgExpr->isNullPointerConstant(Context,
3578 Expr::NPC_NeverValueDependent)) {
3579 Diag(CallLoc, diag::warn_null_arg) << ArgExpr->getSourceRange();
3580 DiagnoseCalleeStaticArrayParam(*this, Param);
3581 return;
3582 }
3583
3584 const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT);
3585 if (!CAT)
3586 return;
3587
3588 const ConstantArrayType *ArgCAT =
3589 Context.getAsConstantArrayType(ArgExpr->IgnoreParenImpCasts()->getType());
3590 if (!ArgCAT)
3591 return;
3592
3593 if (ArgCAT->getSize().ult(CAT->getSize())) {
3594 Diag(CallLoc, diag::warn_static_array_too_small)
3595 << ArgExpr->getSourceRange()
3596 << (unsigned) ArgCAT->getSize().getZExtValue()
3597 << (unsigned) CAT->getSize().getZExtValue();
3598 DiagnoseCalleeStaticArrayParam(*this, Param);
3599 }
3600}
3601
John McCall755d8492011-04-12 00:42:48 +00003602/// Given a function expression of unknown-any type, try to rebuild it
3603/// to have a function type.
3604static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *fn);
3605
Steve Narofff69936d2007-09-16 03:34:24 +00003606/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
Reid Spencer5f016e22007-07-11 17:01:13 +00003607/// This provides the location of the left/right parens and a list of comma
3608/// locations.
John McCall60d7b3a2010-08-24 06:29:42 +00003609ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003610Sema::ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00003611 MultiExprArg ArgExprs, SourceLocation RParenLoc,
Peter Collingbourne1f240762011-10-02 23:49:29 +00003612 Expr *ExecConfig, bool IsExecConfig) {
Richard Trieuccd891a2011-09-09 01:45:06 +00003613 unsigned NumArgs = ArgExprs.size();
Nate Begeman2ef13e52009-08-10 23:49:36 +00003614
3615 // Since this might be a postfix expression, get rid of ParenListExprs.
John McCall60d7b3a2010-08-24 06:29:42 +00003616 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Fn);
John McCall9ae2f072010-08-23 23:25:46 +00003617 if (Result.isInvalid()) return ExprError();
3618 Fn = Result.take();
Mike Stump1eb44332009-09-09 15:08:12 +00003619
Richard Trieuccd891a2011-09-09 01:45:06 +00003620 Expr **Args = ArgExprs.release();
Mike Stump1eb44332009-09-09 15:08:12 +00003621
Douglas Gregor88a35142008-12-22 05:46:06 +00003622 if (getLangOptions().CPlusPlus) {
Douglas Gregora71d8192009-09-04 17:36:40 +00003623 // If this is a pseudo-destructor expression, build the call immediately.
3624 if (isa<CXXPseudoDestructorExpr>(Fn)) {
3625 if (NumArgs > 0) {
3626 // Pseudo-destructor calls should not have any arguments.
3627 Diag(Fn->getLocStart(), diag::err_pseudo_dtor_call_with_args)
Douglas Gregor849b2432010-03-31 17:46:05 +00003628 << FixItHint::CreateRemoval(
Douglas Gregora71d8192009-09-04 17:36:40 +00003629 SourceRange(Args[0]->getLocStart(),
3630 Args[NumArgs-1]->getLocEnd()));
Mike Stump1eb44332009-09-09 15:08:12 +00003631
Douglas Gregora71d8192009-09-04 17:36:40 +00003632 NumArgs = 0;
3633 }
Mike Stump1eb44332009-09-09 15:08:12 +00003634
Douglas Gregora71d8192009-09-04 17:36:40 +00003635 return Owned(new (Context) CallExpr(Context, Fn, 0, 0, Context.VoidTy,
John McCallf89e55a2010-11-18 06:31:45 +00003636 VK_RValue, RParenLoc));
Douglas Gregora71d8192009-09-04 17:36:40 +00003637 }
Mike Stump1eb44332009-09-09 15:08:12 +00003638
Douglas Gregor17330012009-02-04 15:01:18 +00003639 // Determine whether this is a dependent call inside a C++ template,
Mike Stumpeed9cac2009-02-19 03:04:26 +00003640 // in which case we won't do any semantic analysis now.
Mike Stump390b4cc2009-05-16 07:39:55 +00003641 // FIXME: Will need to cache the results of name lookup (including ADL) in
3642 // Fn.
Douglas Gregor17330012009-02-04 15:01:18 +00003643 bool Dependent = false;
3644 if (Fn->isTypeDependent())
3645 Dependent = true;
3646 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs))
3647 Dependent = true;
3648
Peter Collingbournee08ce652011-02-09 21:07:24 +00003649 if (Dependent) {
3650 if (ExecConfig) {
3651 return Owned(new (Context) CUDAKernelCallExpr(
3652 Context, Fn, cast<CallExpr>(ExecConfig), Args, NumArgs,
3653 Context.DependentTy, VK_RValue, RParenLoc));
3654 } else {
3655 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs,
3656 Context.DependentTy, VK_RValue,
3657 RParenLoc));
3658 }
3659 }
Douglas Gregor17330012009-02-04 15:01:18 +00003660
3661 // Determine whether this is a call to an object (C++ [over.call.object]).
3662 if (Fn->getType()->isRecordType())
3663 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00003664 RParenLoc));
Douglas Gregor17330012009-02-04 15:01:18 +00003665
John McCall755d8492011-04-12 00:42:48 +00003666 if (Fn->getType() == Context.UnknownAnyTy) {
3667 ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
3668 if (result.isInvalid()) return ExprError();
3669 Fn = result.take();
3670 }
3671
John McCall864c0412011-04-26 20:42:42 +00003672 if (Fn->getType() == Context.BoundMemberTy) {
John McCallaa81e162009-12-01 22:10:20 +00003673 return BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00003674 RParenLoc);
John McCall129e2df2009-11-30 22:42:35 +00003675 }
John McCall864c0412011-04-26 20:42:42 +00003676 }
John McCall129e2df2009-11-30 22:42:35 +00003677
John McCall864c0412011-04-26 20:42:42 +00003678 // Check for overloaded calls. This can happen even in C due to extensions.
3679 if (Fn->getType() == Context.OverloadTy) {
3680 OverloadExpr::FindResult find = OverloadExpr::find(Fn);
3681
Douglas Gregoree697e62011-10-13 18:10:35 +00003682 // We aren't supposed to apply this logic for if there's an '&' involved.
Douglas Gregor64a371f2011-10-13 18:26:27 +00003683 if (!find.HasFormOfMemberPointer) {
John McCall864c0412011-04-26 20:42:42 +00003684 OverloadExpr *ovl = find.Expression;
3685 if (isa<UnresolvedLookupExpr>(ovl)) {
3686 UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(ovl);
3687 return BuildOverloadedCallExpr(S, Fn, ULE, LParenLoc, Args, NumArgs,
3688 RParenLoc, ExecConfig);
3689 } else {
John McCallaa81e162009-12-01 22:10:20 +00003690 return BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00003691 RParenLoc);
Anders Carlsson83ccfc32009-10-03 17:40:22 +00003692 }
3693 }
Douglas Gregor88a35142008-12-22 05:46:06 +00003694 }
3695
Douglas Gregorfa047642009-02-04 00:32:51 +00003696 // If we're directly calling a function, get the appropriate declaration.
Douglas Gregorf1d1ca52011-12-01 01:37:36 +00003697 if (Fn->getType() == Context.UnknownAnyTy) {
3698 ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
3699 if (result.isInvalid()) return ExprError();
3700 Fn = result.take();
3701 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00003702
Eli Friedmanefa42f72009-12-26 03:35:45 +00003703 Expr *NakedFn = Fn->IgnoreParens();
Douglas Gregoref9b1492010-11-09 20:03:54 +00003704
John McCall3b4294e2009-12-16 12:17:52 +00003705 NamedDecl *NDecl = 0;
Douglas Gregord8f0ade2010-10-25 20:48:33 +00003706 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(NakedFn))
3707 if (UnOp->getOpcode() == UO_AddrOf)
3708 NakedFn = UnOp->getSubExpr()->IgnoreParens();
3709
John McCall3b4294e2009-12-16 12:17:52 +00003710 if (isa<DeclRefExpr>(NakedFn))
3711 NDecl = cast<DeclRefExpr>(NakedFn)->getDecl();
John McCall864c0412011-04-26 20:42:42 +00003712 else if (isa<MemberExpr>(NakedFn))
3713 NDecl = cast<MemberExpr>(NakedFn)->getMemberDecl();
John McCall3b4294e2009-12-16 12:17:52 +00003714
Peter Collingbournee08ce652011-02-09 21:07:24 +00003715 return BuildResolvedCallExpr(Fn, NDecl, LParenLoc, Args, NumArgs, RParenLoc,
Peter Collingbourne1f240762011-10-02 23:49:29 +00003716 ExecConfig, IsExecConfig);
Peter Collingbournee08ce652011-02-09 21:07:24 +00003717}
3718
3719ExprResult
3720Sema::ActOnCUDAExecConfigExpr(Scope *S, SourceLocation LLLLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00003721 MultiExprArg ExecConfig, SourceLocation GGGLoc) {
Peter Collingbournee08ce652011-02-09 21:07:24 +00003722 FunctionDecl *ConfigDecl = Context.getcudaConfigureCallDecl();
3723 if (!ConfigDecl)
3724 return ExprError(Diag(LLLLoc, diag::err_undeclared_var_use)
3725 << "cudaConfigureCall");
3726 QualType ConfigQTy = ConfigDecl->getType();
3727
3728 DeclRefExpr *ConfigDR = new (Context) DeclRefExpr(
3729 ConfigDecl, ConfigQTy, VK_LValue, LLLLoc);
3730
Peter Collingbourne1f240762011-10-02 23:49:29 +00003731 return ActOnCallExpr(S, ConfigDR, LLLLoc, ExecConfig, GGGLoc, 0,
3732 /*IsExecConfig=*/true);
John McCallaa81e162009-12-01 22:10:20 +00003733}
3734
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003735/// ActOnAsTypeExpr - create a new asType (bitcast) from the arguments.
3736///
3737/// __builtin_astype( value, dst type )
3738///
Richard Trieuccd891a2011-09-09 01:45:06 +00003739ExprResult Sema::ActOnAsTypeExpr(Expr *E, ParsedType ParsedDestTy,
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003740 SourceLocation BuiltinLoc,
3741 SourceLocation RParenLoc) {
3742 ExprValueKind VK = VK_RValue;
3743 ExprObjectKind OK = OK_Ordinary;
Richard Trieuccd891a2011-09-09 01:45:06 +00003744 QualType DstTy = GetTypeFromParser(ParsedDestTy);
3745 QualType SrcTy = E->getType();
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003746 if (Context.getTypeSize(DstTy) != Context.getTypeSize(SrcTy))
3747 return ExprError(Diag(BuiltinLoc,
3748 diag::err_invalid_astype_of_different_size)
Peter Collingbourneaf9cddf2011-06-08 15:15:17 +00003749 << DstTy
3750 << SrcTy
Richard Trieuccd891a2011-09-09 01:45:06 +00003751 << E->getSourceRange());
3752 return Owned(new (Context) AsTypeExpr(E, DstTy, VK, OK, BuiltinLoc,
Richard Trieu67e29332011-08-02 04:35:43 +00003753 RParenLoc));
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003754}
3755
John McCall3b4294e2009-12-16 12:17:52 +00003756/// BuildResolvedCallExpr - Build a call to a resolved expression,
3757/// i.e. an expression not of \p OverloadTy. The expression should
John McCallaa81e162009-12-01 22:10:20 +00003758/// unary-convert to an expression of function-pointer or
3759/// block-pointer type.
3760///
3761/// \param NDecl the declaration being called, if available
John McCall60d7b3a2010-08-24 06:29:42 +00003762ExprResult
John McCallaa81e162009-12-01 22:10:20 +00003763Sema::BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
3764 SourceLocation LParenLoc,
3765 Expr **Args, unsigned NumArgs,
Peter Collingbournee08ce652011-02-09 21:07:24 +00003766 SourceLocation RParenLoc,
Peter Collingbourne1f240762011-10-02 23:49:29 +00003767 Expr *Config, bool IsExecConfig) {
John McCallaa81e162009-12-01 22:10:20 +00003768 FunctionDecl *FDecl = dyn_cast_or_null<FunctionDecl>(NDecl);
3769
Chris Lattner04421082008-04-08 04:40:51 +00003770 // Promote the function operand.
John Wiegley429bb272011-04-08 18:41:53 +00003771 ExprResult Result = UsualUnaryConversions(Fn);
3772 if (Result.isInvalid())
3773 return ExprError();
3774 Fn = Result.take();
Chris Lattner04421082008-04-08 04:40:51 +00003775
Chris Lattner925e60d2007-12-28 05:29:59 +00003776 // Make the call expr early, before semantic checks. This guarantees cleanup
3777 // of arguments and function on error.
Peter Collingbournee08ce652011-02-09 21:07:24 +00003778 CallExpr *TheCall;
3779 if (Config) {
3780 TheCall = new (Context) CUDAKernelCallExpr(Context, Fn,
3781 cast<CallExpr>(Config),
3782 Args, NumArgs,
3783 Context.BoolTy,
3784 VK_RValue,
3785 RParenLoc);
3786 } else {
3787 TheCall = new (Context) CallExpr(Context, Fn,
3788 Args, NumArgs,
3789 Context.BoolTy,
3790 VK_RValue,
3791 RParenLoc);
3792 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00003793
John McCall8e10f3b2011-02-26 05:39:39 +00003794 unsigned BuiltinID = (FDecl ? FDecl->getBuiltinID() : 0);
3795
3796 // Bail out early if calling a builtin with custom typechecking.
3797 if (BuiltinID && Context.BuiltinInfo.hasCustomTypechecking(BuiltinID))
3798 return CheckBuiltinFunctionCall(BuiltinID, TheCall);
3799
John McCall1de4d4e2011-04-07 08:22:57 +00003800 retry:
Steve Naroffdd972f22008-09-05 22:11:13 +00003801 const FunctionType *FuncT;
John McCall8e10f3b2011-02-26 05:39:39 +00003802 if (const PointerType *PT = Fn->getType()->getAs<PointerType>()) {
Steve Naroffdd972f22008-09-05 22:11:13 +00003803 // C99 6.5.2.2p1 - "The expression that denotes the called function shall
3804 // have type pointer to function".
John McCall183700f2009-09-21 23:43:11 +00003805 FuncT = PT->getPointeeType()->getAs<FunctionType>();
John McCall8e10f3b2011-02-26 05:39:39 +00003806 if (FuncT == 0)
3807 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
3808 << Fn->getType() << Fn->getSourceRange());
3809 } else if (const BlockPointerType *BPT =
3810 Fn->getType()->getAs<BlockPointerType>()) {
3811 FuncT = BPT->getPointeeType()->castAs<FunctionType>();
3812 } else {
John McCall1de4d4e2011-04-07 08:22:57 +00003813 // Handle calls to expressions of unknown-any type.
3814 if (Fn->getType() == Context.UnknownAnyTy) {
John McCall755d8492011-04-12 00:42:48 +00003815 ExprResult rewrite = rebuildUnknownAnyFunction(*this, Fn);
John McCall1de4d4e2011-04-07 08:22:57 +00003816 if (rewrite.isInvalid()) return ExprError();
3817 Fn = rewrite.take();
John McCalla5fc4722011-04-09 22:50:59 +00003818 TheCall->setCallee(Fn);
John McCall1de4d4e2011-04-07 08:22:57 +00003819 goto retry;
3820 }
3821
Sebastian Redl0eb23302009-01-19 00:08:26 +00003822 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
3823 << Fn->getType() << Fn->getSourceRange());
John McCall8e10f3b2011-02-26 05:39:39 +00003824 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00003825
Peter Collingbourne0423fc62011-02-23 01:53:29 +00003826 if (getLangOptions().CUDA) {
3827 if (Config) {
3828 // CUDA: Kernel calls must be to global functions
3829 if (FDecl && !FDecl->hasAttr<CUDAGlobalAttr>())
3830 return ExprError(Diag(LParenLoc,diag::err_kern_call_not_global_function)
3831 << FDecl->getName() << Fn->getSourceRange());
3832
3833 // CUDA: Kernel function must have 'void' return type
3834 if (!FuncT->getResultType()->isVoidType())
3835 return ExprError(Diag(LParenLoc, diag::err_kern_type_not_void_return)
3836 << Fn->getType() << Fn->getSourceRange());
Peter Collingbourne8591a7f2011-10-02 23:49:15 +00003837 } else {
3838 // CUDA: Calls to global functions must be configured
3839 if (FDecl && FDecl->hasAttr<CUDAGlobalAttr>())
3840 return ExprError(Diag(LParenLoc, diag::err_global_call_not_config)
3841 << FDecl->getName() << Fn->getSourceRange());
Peter Collingbourne0423fc62011-02-23 01:53:29 +00003842 }
3843 }
3844
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00003845 // Check for a valid return type
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003846 if (CheckCallReturnType(FuncT->getResultType(),
John McCall9ae2f072010-08-23 23:25:46 +00003847 Fn->getSourceRange().getBegin(), TheCall,
Anders Carlsson8c8d9192009-10-09 23:51:55 +00003848 FDecl))
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00003849 return ExprError();
3850
Chris Lattner925e60d2007-12-28 05:29:59 +00003851 // We know the result type of the call, set it.
Douglas Gregor5291c3c2010-07-13 08:18:22 +00003852 TheCall->setType(FuncT->getCallResultType(Context));
John McCallf89e55a2010-11-18 06:31:45 +00003853 TheCall->setValueKind(Expr::getValueKindForType(FuncT->getResultType()));
Sebastian Redl0eb23302009-01-19 00:08:26 +00003854
Douglas Gregor72564e72009-02-26 23:50:07 +00003855 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) {
John McCall9ae2f072010-08-23 23:25:46 +00003856 if (ConvertArgumentsForCall(TheCall, Fn, FDecl, Proto, Args, NumArgs,
Peter Collingbourne1f240762011-10-02 23:49:29 +00003857 RParenLoc, IsExecConfig))
Sebastian Redl0eb23302009-01-19 00:08:26 +00003858 return ExprError();
Chris Lattner925e60d2007-12-28 05:29:59 +00003859 } else {
Douglas Gregor72564e72009-02-26 23:50:07 +00003860 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!");
Sebastian Redl0eb23302009-01-19 00:08:26 +00003861
Douglas Gregor74734d52009-04-02 15:37:10 +00003862 if (FDecl) {
3863 // Check if we have too few/too many template arguments, based
3864 // on our knowledge of the function definition.
3865 const FunctionDecl *Def = 0;
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00003866 if (FDecl->hasBody(Def) && NumArgs != Def->param_size()) {
Douglas Gregor46542412010-10-25 20:39:23 +00003867 const FunctionProtoType *Proto
3868 = Def->getType()->getAs<FunctionProtoType>();
3869 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size()))
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00003870 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments)
3871 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange();
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00003872 }
Douglas Gregor46542412010-10-25 20:39:23 +00003873
3874 // If the function we're calling isn't a function prototype, but we have
3875 // a function prototype from a prior declaratiom, use that prototype.
3876 if (!FDecl->hasPrototype())
3877 Proto = FDecl->getType()->getAs<FunctionProtoType>();
Douglas Gregor74734d52009-04-02 15:37:10 +00003878 }
3879
Steve Naroffb291ab62007-08-28 23:30:39 +00003880 // Promote the arguments (C99 6.5.2.2p6).
Chris Lattner925e60d2007-12-28 05:29:59 +00003881 for (unsigned i = 0; i != NumArgs; i++) {
3882 Expr *Arg = Args[i];
Douglas Gregor46542412010-10-25 20:39:23 +00003883
3884 if (Proto && i < Proto->getNumArgs()) {
Douglas Gregor46542412010-10-25 20:39:23 +00003885 InitializedEntity Entity
3886 = InitializedEntity::InitializeParameter(Context,
John McCallf85e1932011-06-15 23:02:42 +00003887 Proto->getArgType(i),
3888 Proto->isArgConsumed(i));
Douglas Gregor46542412010-10-25 20:39:23 +00003889 ExprResult ArgE = PerformCopyInitialization(Entity,
3890 SourceLocation(),
3891 Owned(Arg));
3892 if (ArgE.isInvalid())
3893 return true;
3894
3895 Arg = ArgE.takeAs<Expr>();
3896
3897 } else {
John Wiegley429bb272011-04-08 18:41:53 +00003898 ExprResult ArgE = DefaultArgumentPromotion(Arg);
3899
3900 if (ArgE.isInvalid())
3901 return true;
3902
3903 Arg = ArgE.takeAs<Expr>();
Douglas Gregor46542412010-10-25 20:39:23 +00003904 }
3905
Douglas Gregor0700bbf2010-10-26 05:45:40 +00003906 if (RequireCompleteType(Arg->getSourceRange().getBegin(),
3907 Arg->getType(),
3908 PDiag(diag::err_call_incomplete_argument)
3909 << Arg->getSourceRange()))
3910 return ExprError();
3911
Chris Lattner925e60d2007-12-28 05:29:59 +00003912 TheCall->setArg(i, Arg);
Steve Naroffb291ab62007-08-28 23:30:39 +00003913 }
Reid Spencer5f016e22007-07-11 17:01:13 +00003914 }
Chris Lattner925e60d2007-12-28 05:29:59 +00003915
Douglas Gregor88a35142008-12-22 05:46:06 +00003916 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
3917 if (!Method->isStatic())
Sebastian Redl0eb23302009-01-19 00:08:26 +00003918 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object)
3919 << Fn->getSourceRange());
Douglas Gregor88a35142008-12-22 05:46:06 +00003920
Fariborz Jahaniandaf04152009-05-15 20:33:25 +00003921 // Check for sentinels
3922 if (NDecl)
3923 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs);
Mike Stump1eb44332009-09-09 15:08:12 +00003924
Chris Lattner59907c42007-08-10 20:18:51 +00003925 // Do special checking on direct calls to functions.
Anders Carlssond406bf02009-08-16 01:56:34 +00003926 if (FDecl) {
John McCall9ae2f072010-08-23 23:25:46 +00003927 if (CheckFunctionCall(FDecl, TheCall))
Anders Carlssond406bf02009-08-16 01:56:34 +00003928 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00003929
John McCall8e10f3b2011-02-26 05:39:39 +00003930 if (BuiltinID)
Fariborz Jahanian67aba812010-11-30 17:35:24 +00003931 return CheckBuiltinFunctionCall(BuiltinID, TheCall);
Anders Carlssond406bf02009-08-16 01:56:34 +00003932 } else if (NDecl) {
John McCall9ae2f072010-08-23 23:25:46 +00003933 if (CheckBlockCall(NDecl, TheCall))
Anders Carlssond406bf02009-08-16 01:56:34 +00003934 return ExprError();
3935 }
Chris Lattner59907c42007-08-10 20:18:51 +00003936
John McCall9ae2f072010-08-23 23:25:46 +00003937 return MaybeBindToTemporary(TheCall);
Reid Spencer5f016e22007-07-11 17:01:13 +00003938}
3939
John McCall60d7b3a2010-08-24 06:29:42 +00003940ExprResult
John McCallb3d87482010-08-24 05:47:05 +00003941Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, ParsedType Ty,
John McCall9ae2f072010-08-23 23:25:46 +00003942 SourceLocation RParenLoc, Expr *InitExpr) {
Steve Narofff69936d2007-09-16 03:34:24 +00003943 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type");
Steve Naroffaff1edd2007-07-19 21:32:11 +00003944 // FIXME: put back this assert when initializers are worked out.
Steve Narofff69936d2007-09-16 03:34:24 +00003945 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression");
John McCall42f56b52010-01-18 19:35:47 +00003946
3947 TypeSourceInfo *TInfo;
3948 QualType literalType = GetTypeFromParser(Ty, &TInfo);
3949 if (!TInfo)
3950 TInfo = Context.getTrivialTypeSourceInfo(literalType);
3951
John McCall9ae2f072010-08-23 23:25:46 +00003952 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, InitExpr);
John McCall42f56b52010-01-18 19:35:47 +00003953}
3954
John McCall60d7b3a2010-08-24 06:29:42 +00003955ExprResult
John McCall42f56b52010-01-18 19:35:47 +00003956Sema::BuildCompoundLiteralExpr(SourceLocation LParenLoc, TypeSourceInfo *TInfo,
Richard Trieuccd891a2011-09-09 01:45:06 +00003957 SourceLocation RParenLoc, Expr *LiteralExpr) {
John McCall42f56b52010-01-18 19:35:47 +00003958 QualType literalType = TInfo->getType();
Anders Carlssond35c8322007-12-05 07:24:19 +00003959
Eli Friedman6223c222008-05-20 05:22:08 +00003960 if (literalType->isArrayType()) {
Argyrios Kyrtzidise6fe9a22010-11-08 19:14:19 +00003961 if (RequireCompleteType(LParenLoc, Context.getBaseElementType(literalType),
3962 PDiag(diag::err_illegal_decl_array_incomplete_type)
3963 << SourceRange(LParenLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00003964 LiteralExpr->getSourceRange().getEnd())))
Argyrios Kyrtzidise6fe9a22010-11-08 19:14:19 +00003965 return ExprError();
Chris Lattnerc63a1f22008-08-04 07:31:14 +00003966 if (literalType->isVariableArrayType())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003967 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init)
Richard Trieuccd891a2011-09-09 01:45:06 +00003968 << SourceRange(LParenLoc, LiteralExpr->getSourceRange().getEnd()));
Douglas Gregor690dc7f2009-05-21 23:48:18 +00003969 } else if (!literalType->isDependentType() &&
3970 RequireCompleteType(LParenLoc, literalType,
Anders Carlssonb7906612009-08-26 23:45:07 +00003971 PDiag(diag::err_typecheck_decl_incomplete_type)
Mike Stump1eb44332009-09-09 15:08:12 +00003972 << SourceRange(LParenLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00003973 LiteralExpr->getSourceRange().getEnd())))
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003974 return ExprError();
Eli Friedman6223c222008-05-20 05:22:08 +00003975
Douglas Gregor99a2e602009-12-16 01:38:02 +00003976 InitializedEntity Entity
Douglas Gregord6542d82009-12-22 15:35:07 +00003977 = InitializedEntity::InitializeTemporary(literalType);
Douglas Gregor99a2e602009-12-16 01:38:02 +00003978 InitializationKind Kind
John McCallf85e1932011-06-15 23:02:42 +00003979 = InitializationKind::CreateCStyleCast(LParenLoc,
3980 SourceRange(LParenLoc, RParenLoc));
Richard Trieuccd891a2011-09-09 01:45:06 +00003981 InitializationSequence InitSeq(*this, Entity, Kind, &LiteralExpr, 1);
John McCall60d7b3a2010-08-24 06:29:42 +00003982 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
Richard Trieuccd891a2011-09-09 01:45:06 +00003983 MultiExprArg(*this, &LiteralExpr, 1),
Eli Friedman08544622009-12-22 02:35:53 +00003984 &literalType);
3985 if (Result.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003986 return ExprError();
Richard Trieuccd891a2011-09-09 01:45:06 +00003987 LiteralExpr = Result.get();
Steve Naroffe9b12192008-01-14 18:19:28 +00003988
Chris Lattner371f2582008-12-04 23:50:19 +00003989 bool isFileScope = getCurFunctionOrMethodDecl() == 0;
Steve Naroffe9b12192008-01-14 18:19:28 +00003990 if (isFileScope) { // 6.5.2.5p3
Richard Trieuccd891a2011-09-09 01:45:06 +00003991 if (CheckForConstantInitializer(LiteralExpr, literalType))
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00003992 return ExprError();
Steve Naroffd0091aa2008-01-10 22:15:12 +00003993 }
Eli Friedman08544622009-12-22 02:35:53 +00003994
John McCallf89e55a2010-11-18 06:31:45 +00003995 // In C, compound literals are l-values for some reason.
3996 ExprValueKind VK = getLangOptions().CPlusPlus ? VK_RValue : VK_LValue;
3997
Douglas Gregor751ec9b2011-06-17 04:59:12 +00003998 return MaybeBindToTemporary(
3999 new (Context) CompoundLiteralExpr(LParenLoc, TInfo, literalType,
Richard Trieuccd891a2011-09-09 01:45:06 +00004000 VK, LiteralExpr, isFileScope));
Steve Naroff4aa88f82007-07-19 01:06:55 +00004001}
4002
John McCall60d7b3a2010-08-24 06:29:42 +00004003ExprResult
Richard Trieuccd891a2011-09-09 01:45:06 +00004004Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg InitArgList,
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004005 SourceLocation RBraceLoc) {
Richard Trieuccd891a2011-09-09 01:45:06 +00004006 unsigned NumInit = InitArgList.size();
4007 Expr **InitList = InitArgList.release();
Anders Carlsson66b5a8a2007-08-31 04:56:16 +00004008
John McCall3c3b7f92011-10-25 17:37:35 +00004009 // Immediately handle non-overload placeholders. Overloads can be
4010 // resolved contextually, but everything else here can't.
4011 for (unsigned I = 0; I != NumInit; ++I) {
John McCall32509f12011-11-15 01:35:18 +00004012 if (InitList[I]->getType()->isNonOverloadPlaceholderType()) {
John McCall3c3b7f92011-10-25 17:37:35 +00004013 ExprResult result = CheckPlaceholderExpr(InitList[I]);
4014
4015 // Ignore failures; dropping the entire initializer list because
4016 // of one failure would be terrible for indexing/etc.
4017 if (result.isInvalid()) continue;
4018
4019 InitList[I] = result.take();
4020 }
4021 }
4022
Steve Naroff08d92e42007-09-15 18:49:24 +00004023 // Semantic analysis for initializers is done by ActOnDeclarator() and
Mike Stumpeed9cac2009-02-19 03:04:26 +00004024 // CheckInitializer() - it requires knowledge of the object being intialized.
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004025
Ted Kremenek709210f2010-04-13 23:39:13 +00004026 InitListExpr *E = new (Context) InitListExpr(Context, LBraceLoc, InitList,
4027 NumInit, RBraceLoc);
Chris Lattnerf0467b32008-04-02 04:24:33 +00004028 E->setType(Context.VoidTy); // FIXME: just a place holder for now.
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004029 return Owned(E);
Steve Naroff4aa88f82007-07-19 01:06:55 +00004030}
4031
John McCalldc05b112011-09-10 01:16:55 +00004032/// Do an explicit extend of the given block pointer if we're in ARC.
4033static void maybeExtendBlockObject(Sema &S, ExprResult &E) {
4034 assert(E.get()->getType()->isBlockPointerType());
4035 assert(E.get()->isRValue());
4036
4037 // Only do this in an r-value context.
4038 if (!S.getLangOptions().ObjCAutoRefCount) return;
4039
4040 E = ImplicitCastExpr::Create(S.Context, E.get()->getType(),
John McCall33e56f32011-09-10 06:18:15 +00004041 CK_ARCExtendBlockObject, E.get(),
John McCalldc05b112011-09-10 01:16:55 +00004042 /*base path*/ 0, VK_RValue);
4043 S.ExprNeedsCleanups = true;
4044}
4045
4046/// Prepare a conversion of the given expression to an ObjC object
4047/// pointer type.
4048CastKind Sema::PrepareCastToObjCObjectPointer(ExprResult &E) {
4049 QualType type = E.get()->getType();
4050 if (type->isObjCObjectPointerType()) {
4051 return CK_BitCast;
4052 } else if (type->isBlockPointerType()) {
4053 maybeExtendBlockObject(*this, E);
4054 return CK_BlockPointerToObjCPointerCast;
4055 } else {
4056 assert(type->isPointerType());
4057 return CK_CPointerToObjCPointerCast;
4058 }
4059}
4060
John McCallf3ea8cf2010-11-14 08:17:51 +00004061/// Prepares for a scalar cast, performing all the necessary stages
4062/// except the final cast and returning the kind required.
John McCalla180f042011-10-06 23:25:11 +00004063CastKind Sema::PrepareScalarCast(ExprResult &Src, QualType DestTy) {
John McCallf3ea8cf2010-11-14 08:17:51 +00004064 // Both Src and Dest are scalar types, i.e. arithmetic or pointer.
4065 // Also, callers should have filtered out the invalid cases with
4066 // pointers. Everything else should be possible.
4067
John Wiegley429bb272011-04-08 18:41:53 +00004068 QualType SrcTy = Src.get()->getType();
John McCalla180f042011-10-06 23:25:11 +00004069 if (Context.hasSameUnqualifiedType(SrcTy, DestTy))
John McCall2de56d12010-08-25 11:45:40 +00004070 return CK_NoOp;
Anders Carlsson82debc72009-10-18 18:12:03 +00004071
John McCall1d9b3b22011-09-09 05:25:32 +00004072 switch (Type::ScalarTypeKind SrcKind = SrcTy->getScalarTypeKind()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00004073 case Type::STK_MemberPointer:
4074 llvm_unreachable("member pointer type in C");
Abramo Bagnarabb03f5d2011-01-04 09:50:03 +00004075
John McCall1d9b3b22011-09-09 05:25:32 +00004076 case Type::STK_CPointer:
4077 case Type::STK_BlockPointer:
4078 case Type::STK_ObjCObjectPointer:
John McCalldaa8e4e2010-11-15 09:13:47 +00004079 switch (DestTy->getScalarTypeKind()) {
John McCall1d9b3b22011-09-09 05:25:32 +00004080 case Type::STK_CPointer:
4081 return CK_BitCast;
4082 case Type::STK_BlockPointer:
4083 return (SrcKind == Type::STK_BlockPointer
4084 ? CK_BitCast : CK_AnyPointerToBlockPointerCast);
4085 case Type::STK_ObjCObjectPointer:
4086 if (SrcKind == Type::STK_ObjCObjectPointer)
4087 return CK_BitCast;
4088 else if (SrcKind == Type::STK_CPointer)
4089 return CK_CPointerToObjCPointerCast;
John McCalldc05b112011-09-10 01:16:55 +00004090 else {
John McCalla180f042011-10-06 23:25:11 +00004091 maybeExtendBlockObject(*this, Src);
John McCall1d9b3b22011-09-09 05:25:32 +00004092 return CK_BlockPointerToObjCPointerCast;
John McCalldc05b112011-09-10 01:16:55 +00004093 }
John McCalldaa8e4e2010-11-15 09:13:47 +00004094 case Type::STK_Bool:
4095 return CK_PointerToBoolean;
4096 case Type::STK_Integral:
4097 return CK_PointerToIntegral;
4098 case Type::STK_Floating:
4099 case Type::STK_FloatingComplex:
4100 case Type::STK_IntegralComplex:
4101 case Type::STK_MemberPointer:
4102 llvm_unreachable("illegal cast from pointer");
4103 }
4104 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004105
John McCalldaa8e4e2010-11-15 09:13:47 +00004106 case Type::STK_Bool: // casting from bool is like casting from an integer
4107 case Type::STK_Integral:
4108 switch (DestTy->getScalarTypeKind()) {
John McCall1d9b3b22011-09-09 05:25:32 +00004109 case Type::STK_CPointer:
4110 case Type::STK_ObjCObjectPointer:
4111 case Type::STK_BlockPointer:
John McCalla180f042011-10-06 23:25:11 +00004112 if (Src.get()->isNullPointerConstant(Context,
Richard Trieu67e29332011-08-02 04:35:43 +00004113 Expr::NPC_ValueDependentIsNull))
John McCall404cd162010-11-13 01:35:44 +00004114 return CK_NullToPointer;
John McCall2de56d12010-08-25 11:45:40 +00004115 return CK_IntegralToPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00004116 case Type::STK_Bool:
4117 return CK_IntegralToBoolean;
4118 case Type::STK_Integral:
John McCallf3ea8cf2010-11-14 08:17:51 +00004119 return CK_IntegralCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00004120 case Type::STK_Floating:
John McCall2de56d12010-08-25 11:45:40 +00004121 return CK_IntegralToFloating;
John McCalldaa8e4e2010-11-15 09:13:47 +00004122 case Type::STK_IntegralComplex:
John McCalla180f042011-10-06 23:25:11 +00004123 Src = ImpCastExprToType(Src.take(),
4124 DestTy->castAs<ComplexType>()->getElementType(),
4125 CK_IntegralCast);
John McCallf3ea8cf2010-11-14 08:17:51 +00004126 return CK_IntegralRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00004127 case Type::STK_FloatingComplex:
John McCalla180f042011-10-06 23:25:11 +00004128 Src = ImpCastExprToType(Src.take(),
4129 DestTy->castAs<ComplexType>()->getElementType(),
4130 CK_IntegralToFloating);
John McCallf3ea8cf2010-11-14 08:17:51 +00004131 return CK_FloatingRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00004132 case Type::STK_MemberPointer:
4133 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00004134 }
4135 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004136
John McCalldaa8e4e2010-11-15 09:13:47 +00004137 case Type::STK_Floating:
4138 switch (DestTy->getScalarTypeKind()) {
4139 case Type::STK_Floating:
John McCall2de56d12010-08-25 11:45:40 +00004140 return CK_FloatingCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00004141 case Type::STK_Bool:
4142 return CK_FloatingToBoolean;
4143 case Type::STK_Integral:
John McCall2de56d12010-08-25 11:45:40 +00004144 return CK_FloatingToIntegral;
John McCalldaa8e4e2010-11-15 09:13:47 +00004145 case Type::STK_FloatingComplex:
John McCalla180f042011-10-06 23:25:11 +00004146 Src = ImpCastExprToType(Src.take(),
4147 DestTy->castAs<ComplexType>()->getElementType(),
4148 CK_FloatingCast);
John McCallf3ea8cf2010-11-14 08:17:51 +00004149 return CK_FloatingRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00004150 case Type::STK_IntegralComplex:
John McCalla180f042011-10-06 23:25:11 +00004151 Src = ImpCastExprToType(Src.take(),
4152 DestTy->castAs<ComplexType>()->getElementType(),
4153 CK_FloatingToIntegral);
John McCallf3ea8cf2010-11-14 08:17:51 +00004154 return CK_IntegralRealToComplex;
John McCall1d9b3b22011-09-09 05:25:32 +00004155 case Type::STK_CPointer:
4156 case Type::STK_ObjCObjectPointer:
4157 case Type::STK_BlockPointer:
John McCalldaa8e4e2010-11-15 09:13:47 +00004158 llvm_unreachable("valid float->pointer cast?");
4159 case Type::STK_MemberPointer:
4160 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00004161 }
4162 break;
4163
John McCalldaa8e4e2010-11-15 09:13:47 +00004164 case Type::STK_FloatingComplex:
4165 switch (DestTy->getScalarTypeKind()) {
4166 case Type::STK_FloatingComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004167 return CK_FloatingComplexCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00004168 case Type::STK_IntegralComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004169 return CK_FloatingComplexToIntegralComplex;
John McCall8786da72010-12-14 17:51:41 +00004170 case Type::STK_Floating: {
John McCalla180f042011-10-06 23:25:11 +00004171 QualType ET = SrcTy->castAs<ComplexType>()->getElementType();
4172 if (Context.hasSameType(ET, DestTy))
John McCall8786da72010-12-14 17:51:41 +00004173 return CK_FloatingComplexToReal;
John McCalla180f042011-10-06 23:25:11 +00004174 Src = ImpCastExprToType(Src.take(), ET, CK_FloatingComplexToReal);
John McCall8786da72010-12-14 17:51:41 +00004175 return CK_FloatingCast;
4176 }
John McCalldaa8e4e2010-11-15 09:13:47 +00004177 case Type::STK_Bool:
John McCallf3ea8cf2010-11-14 08:17:51 +00004178 return CK_FloatingComplexToBoolean;
John McCalldaa8e4e2010-11-15 09:13:47 +00004179 case Type::STK_Integral:
John McCalla180f042011-10-06 23:25:11 +00004180 Src = ImpCastExprToType(Src.take(),
4181 SrcTy->castAs<ComplexType>()->getElementType(),
4182 CK_FloatingComplexToReal);
John McCallf3ea8cf2010-11-14 08:17:51 +00004183 return CK_FloatingToIntegral;
John McCall1d9b3b22011-09-09 05:25:32 +00004184 case Type::STK_CPointer:
4185 case Type::STK_ObjCObjectPointer:
4186 case Type::STK_BlockPointer:
John McCalldaa8e4e2010-11-15 09:13:47 +00004187 llvm_unreachable("valid complex float->pointer cast?");
4188 case Type::STK_MemberPointer:
4189 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00004190 }
4191 break;
4192
John McCalldaa8e4e2010-11-15 09:13:47 +00004193 case Type::STK_IntegralComplex:
4194 switch (DestTy->getScalarTypeKind()) {
4195 case Type::STK_FloatingComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004196 return CK_IntegralComplexToFloatingComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00004197 case Type::STK_IntegralComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004198 return CK_IntegralComplexCast;
John McCall8786da72010-12-14 17:51:41 +00004199 case Type::STK_Integral: {
John McCalla180f042011-10-06 23:25:11 +00004200 QualType ET = SrcTy->castAs<ComplexType>()->getElementType();
4201 if (Context.hasSameType(ET, DestTy))
John McCall8786da72010-12-14 17:51:41 +00004202 return CK_IntegralComplexToReal;
John McCalla180f042011-10-06 23:25:11 +00004203 Src = ImpCastExprToType(Src.take(), ET, CK_IntegralComplexToReal);
John McCall8786da72010-12-14 17:51:41 +00004204 return CK_IntegralCast;
4205 }
John McCalldaa8e4e2010-11-15 09:13:47 +00004206 case Type::STK_Bool:
John McCallf3ea8cf2010-11-14 08:17:51 +00004207 return CK_IntegralComplexToBoolean;
John McCalldaa8e4e2010-11-15 09:13:47 +00004208 case Type::STK_Floating:
John McCalla180f042011-10-06 23:25:11 +00004209 Src = ImpCastExprToType(Src.take(),
4210 SrcTy->castAs<ComplexType>()->getElementType(),
4211 CK_IntegralComplexToReal);
John McCallf3ea8cf2010-11-14 08:17:51 +00004212 return CK_IntegralToFloating;
John McCall1d9b3b22011-09-09 05:25:32 +00004213 case Type::STK_CPointer:
4214 case Type::STK_ObjCObjectPointer:
4215 case Type::STK_BlockPointer:
John McCalldaa8e4e2010-11-15 09:13:47 +00004216 llvm_unreachable("valid complex int->pointer cast?");
4217 case Type::STK_MemberPointer:
4218 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00004219 }
4220 break;
Anders Carlsson82debc72009-10-18 18:12:03 +00004221 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004222
John McCallf3ea8cf2010-11-14 08:17:51 +00004223 llvm_unreachable("Unhandled scalar cast");
Anders Carlsson82debc72009-10-18 18:12:03 +00004224}
4225
Anders Carlssonc3516322009-10-16 02:48:28 +00004226bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty,
John McCall2de56d12010-08-25 11:45:40 +00004227 CastKind &Kind) {
Anders Carlssona64db8f2007-11-27 05:51:55 +00004228 assert(VectorTy->isVectorType() && "Not a vector type!");
Mike Stumpeed9cac2009-02-19 03:04:26 +00004229
Anders Carlssona64db8f2007-11-27 05:51:55 +00004230 if (Ty->isVectorType() || Ty->isIntegerType()) {
Chris Lattner98be4942008-03-05 18:54:05 +00004231 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty))
Anders Carlssona64db8f2007-11-27 05:51:55 +00004232 return Diag(R.getBegin(),
Mike Stumpeed9cac2009-02-19 03:04:26 +00004233 Ty->isVectorType() ?
Anders Carlssona64db8f2007-11-27 05:51:55 +00004234 diag::err_invalid_conversion_between_vectors :
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00004235 diag::err_invalid_conversion_between_vector_and_integer)
Chris Lattnerd1625842008-11-24 06:25:27 +00004236 << VectorTy << Ty << R;
Anders Carlssona64db8f2007-11-27 05:51:55 +00004237 } else
4238 return Diag(R.getBegin(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00004239 diag::err_invalid_conversion_between_vector_and_scalar)
Chris Lattnerd1625842008-11-24 06:25:27 +00004240 << VectorTy << Ty << R;
Mike Stumpeed9cac2009-02-19 03:04:26 +00004241
John McCall2de56d12010-08-25 11:45:40 +00004242 Kind = CK_BitCast;
Anders Carlssona64db8f2007-11-27 05:51:55 +00004243 return false;
4244}
4245
John Wiegley429bb272011-04-08 18:41:53 +00004246ExprResult Sema::CheckExtVectorCast(SourceRange R, QualType DestTy,
4247 Expr *CastExpr, CastKind &Kind) {
Nate Begeman58d29a42009-06-26 00:50:28 +00004248 assert(DestTy->isExtVectorType() && "Not an extended vector type!");
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004249
Anders Carlsson16a89042009-10-16 05:23:41 +00004250 QualType SrcTy = CastExpr->getType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004251
Nate Begeman9b10da62009-06-27 22:05:55 +00004252 // If SrcTy is a VectorType, the total size must match to explicitly cast to
4253 // an ExtVectorType.
Tobias Grosser9df05ea2011-09-22 13:03:14 +00004254 // In OpenCL, casts between vectors of different types are not allowed.
4255 // (See OpenCL 6.2).
Nate Begeman58d29a42009-06-26 00:50:28 +00004256 if (SrcTy->isVectorType()) {
Tobias Grosser9df05ea2011-09-22 13:03:14 +00004257 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)
4258 || (getLangOptions().OpenCL &&
4259 (DestTy.getCanonicalType() != SrcTy.getCanonicalType()))) {
John Wiegley429bb272011-04-08 18:41:53 +00004260 Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors)
Nate Begeman58d29a42009-06-26 00:50:28 +00004261 << DestTy << SrcTy << R;
John Wiegley429bb272011-04-08 18:41:53 +00004262 return ExprError();
4263 }
John McCall2de56d12010-08-25 11:45:40 +00004264 Kind = CK_BitCast;
John Wiegley429bb272011-04-08 18:41:53 +00004265 return Owned(CastExpr);
Nate Begeman58d29a42009-06-26 00:50:28 +00004266 }
4267
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00004268 // All non-pointer scalars can be cast to ExtVector type. The appropriate
Nate Begeman58d29a42009-06-26 00:50:28 +00004269 // conversion will take place first from scalar to elt type, and then
4270 // splat from elt type to vector.
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00004271 if (SrcTy->isPointerType())
4272 return Diag(R.getBegin(),
4273 diag::err_invalid_conversion_between_vector_and_scalar)
4274 << DestTy << SrcTy << R;
Eli Friedman73c39ab2009-10-20 08:27:19 +00004275
4276 QualType DestElemTy = DestTy->getAs<ExtVectorType>()->getElementType();
John Wiegley429bb272011-04-08 18:41:53 +00004277 ExprResult CastExprRes = Owned(CastExpr);
John McCalla180f042011-10-06 23:25:11 +00004278 CastKind CK = PrepareScalarCast(CastExprRes, DestElemTy);
John Wiegley429bb272011-04-08 18:41:53 +00004279 if (CastExprRes.isInvalid())
4280 return ExprError();
4281 CastExpr = ImpCastExprToType(CastExprRes.take(), DestElemTy, CK).take();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004282
John McCall2de56d12010-08-25 11:45:40 +00004283 Kind = CK_VectorSplat;
John Wiegley429bb272011-04-08 18:41:53 +00004284 return Owned(CastExpr);
Nate Begeman58d29a42009-06-26 00:50:28 +00004285}
4286
John McCall60d7b3a2010-08-24 06:29:42 +00004287ExprResult
Argyrios Kyrtzidis0a851832011-07-01 22:22:59 +00004288Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc,
4289 Declarator &D, ParsedType &Ty,
Richard Trieuccd891a2011-09-09 01:45:06 +00004290 SourceLocation RParenLoc, Expr *CastExpr) {
4291 assert(!D.isInvalidType() && (CastExpr != 0) &&
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004292 "ActOnCastExpr(): missing type or expr");
Steve Naroff16beff82007-07-16 23:25:18 +00004293
Richard Trieuccd891a2011-09-09 01:45:06 +00004294 TypeSourceInfo *castTInfo = GetTypeForDeclaratorCast(D, CastExpr->getType());
Argyrios Kyrtzidis0a851832011-07-01 22:22:59 +00004295 if (D.isInvalidType())
4296 return ExprError();
4297
4298 if (getLangOptions().CPlusPlus) {
4299 // Check that there are no default arguments (C++ only).
4300 CheckExtraCXXDefaultArguments(D);
4301 }
4302
John McCalle82247a2011-10-01 05:17:03 +00004303 checkUnusedDeclAttributes(D);
4304
Argyrios Kyrtzidis0a851832011-07-01 22:22:59 +00004305 QualType castType = castTInfo->getType();
4306 Ty = CreateParsedType(castType, castTInfo);
Mike Stump1eb44332009-09-09 15:08:12 +00004307
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004308 bool isVectorLiteral = false;
4309
4310 // Check for an altivec or OpenCL literal,
4311 // i.e. all the elements are integer constants.
Richard Trieuccd891a2011-09-09 01:45:06 +00004312 ParenExpr *PE = dyn_cast<ParenExpr>(CastExpr);
4313 ParenListExpr *PLE = dyn_cast<ParenListExpr>(CastExpr);
Tobias Grosser37c31c22011-09-21 18:28:29 +00004314 if ((getLangOptions().AltiVec || getLangOptions().OpenCL)
4315 && castType->isVectorType() && (PE || PLE)) {
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004316 if (PLE && PLE->getNumExprs() == 0) {
4317 Diag(PLE->getExprLoc(), diag::err_altivec_empty_initializer);
4318 return ExprError();
4319 }
4320 if (PE || PLE->getNumExprs() == 1) {
4321 Expr *E = (PE ? PE->getSubExpr() : PLE->getExpr(0));
4322 if (!E->getType()->isVectorType())
4323 isVectorLiteral = true;
4324 }
4325 else
4326 isVectorLiteral = true;
4327 }
4328
4329 // If this is a vector initializer, '(' type ')' '(' init, ..., init ')'
4330 // then handle it as such.
4331 if (isVectorLiteral)
Richard Trieuccd891a2011-09-09 01:45:06 +00004332 return BuildVectorLiteral(LParenLoc, RParenLoc, CastExpr, castTInfo);
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004333
Nate Begeman2ef13e52009-08-10 23:49:36 +00004334 // If the Expr being casted is a ParenListExpr, handle it specially.
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004335 // This is not an AltiVec-style cast, so turn the ParenListExpr into a
4336 // sequence of BinOp comma operators.
Richard Trieuccd891a2011-09-09 01:45:06 +00004337 if (isa<ParenListExpr>(CastExpr)) {
4338 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, CastExpr);
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004339 if (Result.isInvalid()) return ExprError();
Richard Trieuccd891a2011-09-09 01:45:06 +00004340 CastExpr = Result.take();
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004341 }
John McCallb042fdf2010-01-15 18:56:44 +00004342
Richard Trieuccd891a2011-09-09 01:45:06 +00004343 return BuildCStyleCastExpr(LParenLoc, castTInfo, RParenLoc, CastExpr);
John McCallb042fdf2010-01-15 18:56:44 +00004344}
4345
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004346ExprResult Sema::BuildVectorLiteral(SourceLocation LParenLoc,
4347 SourceLocation RParenLoc, Expr *E,
4348 TypeSourceInfo *TInfo) {
4349 assert((isa<ParenListExpr>(E) || isa<ParenExpr>(E)) &&
4350 "Expected paren or paren list expression");
4351
4352 Expr **exprs;
4353 unsigned numExprs;
4354 Expr *subExpr;
4355 if (ParenListExpr *PE = dyn_cast<ParenListExpr>(E)) {
4356 exprs = PE->getExprs();
4357 numExprs = PE->getNumExprs();
4358 } else {
4359 subExpr = cast<ParenExpr>(E)->getSubExpr();
4360 exprs = &subExpr;
4361 numExprs = 1;
4362 }
4363
4364 QualType Ty = TInfo->getType();
4365 assert(Ty->isVectorType() && "Expected vector type");
4366
Chris Lattner5f9e2722011-07-23 10:55:15 +00004367 SmallVector<Expr *, 8> initExprs;
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004368 const VectorType *VTy = Ty->getAs<VectorType>();
4369 unsigned numElems = Ty->getAs<VectorType>()->getNumElements();
4370
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004371 // '(...)' form of vector initialization in AltiVec: the number of
4372 // initializers must be one or must match the size of the vector.
4373 // If a single value is specified in the initializer then it will be
4374 // replicated to all the components of the vector
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004375 if (VTy->getVectorKind() == VectorType::AltiVecVector) {
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004376 // The number of initializers must be one or must match the size of the
4377 // vector. If a single value is specified in the initializer then it will
4378 // be replicated to all the components of the vector
4379 if (numExprs == 1) {
4380 QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
Richard Smith61ffd092011-10-27 23:31:58 +00004381 ExprResult Literal = DefaultLvalueConversion(exprs[0]);
4382 if (Literal.isInvalid())
4383 return ExprError();
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004384 Literal = ImpCastExprToType(Literal.take(), ElemTy,
John McCalla180f042011-10-06 23:25:11 +00004385 PrepareScalarCast(Literal, ElemTy));
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004386 return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.take());
4387 }
4388 else if (numExprs < numElems) {
4389 Diag(E->getExprLoc(),
4390 diag::err_incorrect_number_of_vector_initializers);
4391 return ExprError();
4392 }
4393 else
4394 for (unsigned i = 0, e = numExprs; i != e; ++i)
4395 initExprs.push_back(exprs[i]);
4396 }
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004397 else {
4398 // For OpenCL, when the number of initializers is a single value,
4399 // it will be replicated to all components of the vector.
4400 if (getLangOptions().OpenCL &&
4401 VTy->getVectorKind() == VectorType::GenericVector &&
4402 numExprs == 1) {
4403 QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
Richard Smith61ffd092011-10-27 23:31:58 +00004404 ExprResult Literal = DefaultLvalueConversion(exprs[0]);
4405 if (Literal.isInvalid())
4406 return ExprError();
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004407 Literal = ImpCastExprToType(Literal.take(), ElemTy,
John McCalla180f042011-10-06 23:25:11 +00004408 PrepareScalarCast(Literal, ElemTy));
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004409 return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.take());
4410 }
4411
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004412 for (unsigned i = 0, e = numExprs; i != e; ++i)
4413 initExprs.push_back(exprs[i]);
Tanya Lattner61b4bc82011-07-15 23:07:01 +00004414 }
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004415 // FIXME: This means that pretty-printing the final AST will produce curly
4416 // braces instead of the original commas.
4417 InitListExpr *initE = new (Context) InitListExpr(Context, LParenLoc,
4418 &initExprs[0],
4419 initExprs.size(), RParenLoc);
4420 initE->setType(Ty);
4421 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, initE);
4422}
4423
Nate Begeman2ef13e52009-08-10 23:49:36 +00004424/// This is not an AltiVec-style cast, so turn the ParenListExpr into a sequence
4425/// of comma binary operators.
John McCall60d7b3a2010-08-24 06:29:42 +00004426ExprResult
Richard Trieuccd891a2011-09-09 01:45:06 +00004427Sema::MaybeConvertParenListExprToParenExpr(Scope *S, Expr *OrigExpr) {
4428 ParenListExpr *E = dyn_cast<ParenListExpr>(OrigExpr);
Nate Begeman2ef13e52009-08-10 23:49:36 +00004429 if (!E)
Richard Trieuccd891a2011-09-09 01:45:06 +00004430 return Owned(OrigExpr);
Mike Stump1eb44332009-09-09 15:08:12 +00004431
John McCall60d7b3a2010-08-24 06:29:42 +00004432 ExprResult Result(E->getExpr(0));
Mike Stump1eb44332009-09-09 15:08:12 +00004433
Nate Begeman2ef13e52009-08-10 23:49:36 +00004434 for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i)
John McCall9ae2f072010-08-23 23:25:46 +00004435 Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, Result.get(),
4436 E->getExpr(i));
Mike Stump1eb44332009-09-09 15:08:12 +00004437
John McCall9ae2f072010-08-23 23:25:46 +00004438 if (Result.isInvalid()) return ExprError();
4439
4440 return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), Result.get());
Nate Begeman2ef13e52009-08-10 23:49:36 +00004441}
4442
John McCall60d7b3a2010-08-24 06:29:42 +00004443ExprResult Sema::ActOnParenOrParenListExpr(SourceLocation L,
Richard Trieuccd891a2011-09-09 01:45:06 +00004444 SourceLocation R,
4445 MultiExprArg Val) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00004446 unsigned nexprs = Val.size();
4447 Expr **exprs = reinterpret_cast<Expr**>(Val.release());
Fariborz Jahanianf88f7ab2009-11-25 01:26:41 +00004448 assert((exprs != 0) && "ActOnParenOrParenListExpr() missing expr list");
4449 Expr *expr;
Argyrios Kyrtzidis707f1012011-07-01 22:22:54 +00004450 if (nexprs == 1)
Fariborz Jahanianf88f7ab2009-11-25 01:26:41 +00004451 expr = new (Context) ParenExpr(L, R, exprs[0]);
4452 else
Manuel Klimek0d9106f2011-06-22 20:02:16 +00004453 expr = new (Context) ParenListExpr(Context, L, exprs, nexprs, R,
4454 exprs[nexprs-1]->getType());
Nate Begeman2ef13e52009-08-10 23:49:36 +00004455 return Owned(expr);
4456}
4457
Chandler Carruth82214a82011-02-18 23:54:50 +00004458/// \brief Emit a specialized diagnostic when one expression is a null pointer
Richard Trieu26f96072011-09-02 01:51:02 +00004459/// constant and the other is not a pointer. Returns true if a diagnostic is
4460/// emitted.
Richard Trieu33fc7572011-09-06 20:06:39 +00004461bool Sema::DiagnoseConditionalForNull(Expr *LHSExpr, Expr *RHSExpr,
Chandler Carruth82214a82011-02-18 23:54:50 +00004462 SourceLocation QuestionLoc) {
Richard Trieu33fc7572011-09-06 20:06:39 +00004463 Expr *NullExpr = LHSExpr;
4464 Expr *NonPointerExpr = RHSExpr;
Chandler Carruth82214a82011-02-18 23:54:50 +00004465 Expr::NullPointerConstantKind NullKind =
4466 NullExpr->isNullPointerConstant(Context,
4467 Expr::NPC_ValueDependentIsNotNull);
4468
4469 if (NullKind == Expr::NPCK_NotNull) {
Richard Trieu33fc7572011-09-06 20:06:39 +00004470 NullExpr = RHSExpr;
4471 NonPointerExpr = LHSExpr;
Chandler Carruth82214a82011-02-18 23:54:50 +00004472 NullKind =
4473 NullExpr->isNullPointerConstant(Context,
4474 Expr::NPC_ValueDependentIsNotNull);
4475 }
4476
4477 if (NullKind == Expr::NPCK_NotNull)
4478 return false;
4479
4480 if (NullKind == Expr::NPCK_ZeroInteger) {
4481 // In this case, check to make sure that we got here from a "NULL"
4482 // string in the source code.
4483 NullExpr = NullExpr->IgnoreParenImpCasts();
John McCall834e3f62011-03-08 07:59:04 +00004484 SourceLocation loc = NullExpr->getExprLoc();
4485 if (!findMacroSpelling(loc, "NULL"))
Chandler Carruth82214a82011-02-18 23:54:50 +00004486 return false;
4487 }
4488
4489 int DiagType = (NullKind == Expr::NPCK_CXX0X_nullptr);
4490 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands_null)
4491 << NonPointerExpr->getType() << DiagType
4492 << NonPointerExpr->getSourceRange();
4493 return true;
4494}
4495
Richard Trieu26f96072011-09-02 01:51:02 +00004496/// \brief Return false if the condition expression is valid, true otherwise.
4497static bool checkCondition(Sema &S, Expr *Cond) {
4498 QualType CondTy = Cond->getType();
4499
4500 // C99 6.5.15p2
4501 if (CondTy->isScalarType()) return false;
4502
4503 // OpenCL: Sec 6.3.i says the condition is allowed to be a vector or scalar.
4504 if (S.getLangOptions().OpenCL && CondTy->isVectorType())
4505 return false;
4506
4507 // Emit the proper error message.
4508 S.Diag(Cond->getLocStart(), S.getLangOptions().OpenCL ?
4509 diag::err_typecheck_cond_expect_scalar :
4510 diag::err_typecheck_cond_expect_scalar_or_vector)
4511 << CondTy;
4512 return true;
4513}
4514
4515/// \brief Return false if the two expressions can be converted to a vector,
4516/// true otherwise
4517static bool checkConditionalConvertScalarsToVectors(Sema &S, ExprResult &LHS,
4518 ExprResult &RHS,
4519 QualType CondTy) {
4520 // Both operands should be of scalar type.
4521 if (!LHS.get()->getType()->isScalarType()) {
4522 S.Diag(LHS.get()->getLocStart(), diag::err_typecheck_cond_expect_scalar)
4523 << CondTy;
4524 return true;
4525 }
4526 if (!RHS.get()->getType()->isScalarType()) {
4527 S.Diag(RHS.get()->getLocStart(), diag::err_typecheck_cond_expect_scalar)
4528 << CondTy;
4529 return true;
4530 }
4531
4532 // Implicity convert these scalars to the type of the condition.
4533 LHS = S.ImpCastExprToType(LHS.take(), CondTy, CK_IntegralCast);
4534 RHS = S.ImpCastExprToType(RHS.take(), CondTy, CK_IntegralCast);
4535 return false;
4536}
4537
4538/// \brief Handle when one or both operands are void type.
4539static QualType checkConditionalVoidType(Sema &S, ExprResult &LHS,
4540 ExprResult &RHS) {
4541 Expr *LHSExpr = LHS.get();
4542 Expr *RHSExpr = RHS.get();
4543
4544 if (!LHSExpr->getType()->isVoidType())
4545 S.Diag(RHSExpr->getLocStart(), diag::ext_typecheck_cond_one_void)
4546 << RHSExpr->getSourceRange();
4547 if (!RHSExpr->getType()->isVoidType())
4548 S.Diag(LHSExpr->getLocStart(), diag::ext_typecheck_cond_one_void)
4549 << LHSExpr->getSourceRange();
4550 LHS = S.ImpCastExprToType(LHS.take(), S.Context.VoidTy, CK_ToVoid);
4551 RHS = S.ImpCastExprToType(RHS.take(), S.Context.VoidTy, CK_ToVoid);
4552 return S.Context.VoidTy;
4553}
4554
4555/// \brief Return false if the NullExpr can be promoted to PointerTy,
4556/// true otherwise.
4557static bool checkConditionalNullPointer(Sema &S, ExprResult &NullExpr,
4558 QualType PointerTy) {
4559 if ((!PointerTy->isAnyPointerType() && !PointerTy->isBlockPointerType()) ||
4560 !NullExpr.get()->isNullPointerConstant(S.Context,
4561 Expr::NPC_ValueDependentIsNull))
4562 return true;
4563
4564 NullExpr = S.ImpCastExprToType(NullExpr.take(), PointerTy, CK_NullToPointer);
4565 return false;
4566}
4567
4568/// \brief Checks compatibility between two pointers and return the resulting
4569/// type.
4570static QualType checkConditionalPointerCompatibility(Sema &S, ExprResult &LHS,
4571 ExprResult &RHS,
4572 SourceLocation Loc) {
4573 QualType LHSTy = LHS.get()->getType();
4574 QualType RHSTy = RHS.get()->getType();
4575
4576 if (S.Context.hasSameType(LHSTy, RHSTy)) {
4577 // Two identical pointers types are always compatible.
4578 return LHSTy;
4579 }
4580
4581 QualType lhptee, rhptee;
4582
4583 // Get the pointee types.
John McCall1d9b3b22011-09-09 05:25:32 +00004584 if (const BlockPointerType *LHSBTy = LHSTy->getAs<BlockPointerType>()) {
4585 lhptee = LHSBTy->getPointeeType();
4586 rhptee = RHSTy->castAs<BlockPointerType>()->getPointeeType();
Richard Trieu26f96072011-09-02 01:51:02 +00004587 } else {
John McCall1d9b3b22011-09-09 05:25:32 +00004588 lhptee = LHSTy->castAs<PointerType>()->getPointeeType();
4589 rhptee = RHSTy->castAs<PointerType>()->getPointeeType();
Richard Trieu26f96072011-09-02 01:51:02 +00004590 }
4591
4592 if (!S.Context.typesAreCompatible(lhptee.getUnqualifiedType(),
4593 rhptee.getUnqualifiedType())) {
4594 S.Diag(Loc, diag::warn_typecheck_cond_incompatible_pointers)
4595 << LHSTy << RHSTy << LHS.get()->getSourceRange()
4596 << RHS.get()->getSourceRange();
4597 // In this situation, we assume void* type. No especially good
4598 // reason, but this is what gcc does, and we do have to pick
4599 // to get a consistent AST.
4600 QualType incompatTy = S.Context.getPointerType(S.Context.VoidTy);
4601 LHS = S.ImpCastExprToType(LHS.take(), incompatTy, CK_BitCast);
4602 RHS = S.ImpCastExprToType(RHS.take(), incompatTy, CK_BitCast);
4603 return incompatTy;
4604 }
4605
4606 // The pointer types are compatible.
4607 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to
4608 // differently qualified versions of compatible types, the result type is
4609 // a pointer to an appropriately qualified version of the *composite*
4610 // type.
4611 // FIXME: Need to calculate the composite type.
4612 // FIXME: Need to add qualifiers
4613
4614 LHS = S.ImpCastExprToType(LHS.take(), LHSTy, CK_BitCast);
4615 RHS = S.ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
4616 return LHSTy;
4617}
4618
4619/// \brief Return the resulting type when the operands are both block pointers.
4620static QualType checkConditionalBlockPointerCompatibility(Sema &S,
4621 ExprResult &LHS,
4622 ExprResult &RHS,
4623 SourceLocation Loc) {
4624 QualType LHSTy = LHS.get()->getType();
4625 QualType RHSTy = RHS.get()->getType();
4626
4627 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) {
4628 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) {
4629 QualType destType = S.Context.getPointerType(S.Context.VoidTy);
4630 LHS = S.ImpCastExprToType(LHS.take(), destType, CK_BitCast);
4631 RHS = S.ImpCastExprToType(RHS.take(), destType, CK_BitCast);
4632 return destType;
4633 }
4634 S.Diag(Loc, diag::err_typecheck_cond_incompatible_operands)
4635 << LHSTy << RHSTy << LHS.get()->getSourceRange()
4636 << RHS.get()->getSourceRange();
4637 return QualType();
4638 }
4639
4640 // We have 2 block pointer types.
4641 return checkConditionalPointerCompatibility(S, LHS, RHS, Loc);
4642}
4643
4644/// \brief Return the resulting type when the operands are both pointers.
4645static QualType
4646checkConditionalObjectPointersCompatibility(Sema &S, ExprResult &LHS,
4647 ExprResult &RHS,
4648 SourceLocation Loc) {
4649 // get the pointer types
4650 QualType LHSTy = LHS.get()->getType();
4651 QualType RHSTy = RHS.get()->getType();
4652
4653 // get the "pointed to" types
4654 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
4655 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
4656
4657 // ignore qualifiers on void (C99 6.5.15p3, clause 6)
4658 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) {
4659 // Figure out necessary qualifiers (C99 6.5.15p6)
4660 QualType destPointee
4661 = S.Context.getQualifiedType(lhptee, rhptee.getQualifiers());
4662 QualType destType = S.Context.getPointerType(destPointee);
4663 // Add qualifiers if necessary.
4664 LHS = S.ImpCastExprToType(LHS.take(), destType, CK_NoOp);
4665 // Promote to void*.
4666 RHS = S.ImpCastExprToType(RHS.take(), destType, CK_BitCast);
4667 return destType;
4668 }
4669 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) {
4670 QualType destPointee
4671 = S.Context.getQualifiedType(rhptee, lhptee.getQualifiers());
4672 QualType destType = S.Context.getPointerType(destPointee);
4673 // Add qualifiers if necessary.
4674 RHS = S.ImpCastExprToType(RHS.take(), destType, CK_NoOp);
4675 // Promote to void*.
4676 LHS = S.ImpCastExprToType(LHS.take(), destType, CK_BitCast);
4677 return destType;
4678 }
4679
4680 return checkConditionalPointerCompatibility(S, LHS, RHS, Loc);
4681}
4682
4683/// \brief Return false if the first expression is not an integer and the second
4684/// expression is not a pointer, true otherwise.
4685static bool checkPointerIntegerMismatch(Sema &S, ExprResult &Int,
4686 Expr* PointerExpr, SourceLocation Loc,
Richard Trieuccd891a2011-09-09 01:45:06 +00004687 bool IsIntFirstExpr) {
Richard Trieu26f96072011-09-02 01:51:02 +00004688 if (!PointerExpr->getType()->isPointerType() ||
4689 !Int.get()->getType()->isIntegerType())
4690 return false;
4691
Richard Trieuccd891a2011-09-09 01:45:06 +00004692 Expr *Expr1 = IsIntFirstExpr ? Int.get() : PointerExpr;
4693 Expr *Expr2 = IsIntFirstExpr ? PointerExpr : Int.get();
Richard Trieu26f96072011-09-02 01:51:02 +00004694
4695 S.Diag(Loc, diag::warn_typecheck_cond_pointer_integer_mismatch)
4696 << Expr1->getType() << Expr2->getType()
4697 << Expr1->getSourceRange() << Expr2->getSourceRange();
4698 Int = S.ImpCastExprToType(Int.take(), PointerExpr->getType(),
4699 CK_IntegralToPointer);
4700 return true;
4701}
4702
Richard Trieu33fc7572011-09-06 20:06:39 +00004703/// Note that LHS is not null here, even if this is the gnu "x ?: y" extension.
4704/// In that case, LHS = cond.
Chris Lattnera119a3b2009-02-18 04:38:20 +00004705/// C99 6.5.15
Richard Trieu67e29332011-08-02 04:35:43 +00004706QualType Sema::CheckConditionalOperands(ExprResult &Cond, ExprResult &LHS,
4707 ExprResult &RHS, ExprValueKind &VK,
4708 ExprObjectKind &OK,
Chris Lattnera119a3b2009-02-18 04:38:20 +00004709 SourceLocation QuestionLoc) {
Douglas Gregorfadb53b2011-03-12 01:48:56 +00004710
Richard Trieu33fc7572011-09-06 20:06:39 +00004711 ExprResult LHSResult = CheckPlaceholderExpr(LHS.get());
4712 if (!LHSResult.isUsable()) return QualType();
4713 LHS = move(LHSResult);
Douglas Gregor7ad5d422010-11-09 21:07:58 +00004714
Richard Trieu33fc7572011-09-06 20:06:39 +00004715 ExprResult RHSResult = CheckPlaceholderExpr(RHS.get());
4716 if (!RHSResult.isUsable()) return QualType();
4717 RHS = move(RHSResult);
Douglas Gregor7ad5d422010-11-09 21:07:58 +00004718
Sebastian Redl3201f6b2009-04-16 17:51:27 +00004719 // C++ is sufficiently different to merit its own checker.
4720 if (getLangOptions().CPlusPlus)
John McCall56ca35d2011-02-17 10:25:35 +00004721 return CXXCheckConditionalOperands(Cond, LHS, RHS, VK, OK, QuestionLoc);
John McCallf89e55a2010-11-18 06:31:45 +00004722
4723 VK = VK_RValue;
John McCall09431682010-11-18 19:01:18 +00004724 OK = OK_Ordinary;
Sebastian Redl3201f6b2009-04-16 17:51:27 +00004725
John Wiegley429bb272011-04-08 18:41:53 +00004726 Cond = UsualUnaryConversions(Cond.take());
4727 if (Cond.isInvalid())
4728 return QualType();
4729 LHS = UsualUnaryConversions(LHS.take());
4730 if (LHS.isInvalid())
4731 return QualType();
4732 RHS = UsualUnaryConversions(RHS.take());
4733 if (RHS.isInvalid())
4734 return QualType();
4735
4736 QualType CondTy = Cond.get()->getType();
4737 QualType LHSTy = LHS.get()->getType();
4738 QualType RHSTy = RHS.get()->getType();
Steve Naroffc80b4ee2007-07-16 21:54:35 +00004739
Reid Spencer5f016e22007-07-11 17:01:13 +00004740 // first, check the condition.
Richard Trieu26f96072011-09-02 01:51:02 +00004741 if (checkCondition(*this, Cond.get()))
4742 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00004743
Chris Lattner70d67a92008-01-06 22:42:25 +00004744 // Now check the two expressions.
Nate Begeman2ef13e52009-08-10 23:49:36 +00004745 if (LHSTy->isVectorType() || RHSTy->isVectorType())
Eli Friedmanb9b4b782011-06-23 18:10:35 +00004746 return CheckVectorOperands(LHS, RHS, QuestionLoc, /*isCompAssign*/false);
Douglas Gregor898574e2008-12-05 23:32:09 +00004747
Nate Begeman6155d732010-09-20 22:41:17 +00004748 // OpenCL: If the condition is a vector, and both operands are scalar,
4749 // attempt to implicity convert them to the vector type to act like the
4750 // built in select.
Richard Trieu26f96072011-09-02 01:51:02 +00004751 if (getLangOptions().OpenCL && CondTy->isVectorType())
4752 if (checkConditionalConvertScalarsToVectors(*this, LHS, RHS, CondTy))
Nate Begeman6155d732010-09-20 22:41:17 +00004753 return QualType();
Nate Begeman6155d732010-09-20 22:41:17 +00004754
Chris Lattner70d67a92008-01-06 22:42:25 +00004755 // If both operands have arithmetic type, do the usual arithmetic conversions
4756 // to find a common type: C99 6.5.15p3,5.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004757 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) {
4758 UsualArithmeticConversions(LHS, RHS);
John Wiegley429bb272011-04-08 18:41:53 +00004759 if (LHS.isInvalid() || RHS.isInvalid())
4760 return QualType();
4761 return LHS.get()->getType();
Steve Naroffa4332e22007-07-17 00:58:39 +00004762 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00004763
Chris Lattner70d67a92008-01-06 22:42:25 +00004764 // If both operands are the same structure or union type, the result is that
4765 // type.
Ted Kremenek6217b802009-07-29 21:53:49 +00004766 if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3
4767 if (const RecordType *RHSRT = RHSTy->getAs<RecordType>())
Chris Lattnera21ddb32007-11-26 01:40:58 +00004768 if (LHSRT->getDecl() == RHSRT->getDecl())
Mike Stumpeed9cac2009-02-19 03:04:26 +00004769 // "If both the operands have structure or union type, the result has
Chris Lattner70d67a92008-01-06 22:42:25 +00004770 // that type." This implies that CV qualifiers are dropped.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004771 return LHSTy.getUnqualifiedType();
Eli Friedmanb1d796d2009-03-23 00:24:07 +00004772 // FIXME: Type of conditional expression must be complete in C mode.
Reid Spencer5f016e22007-07-11 17:01:13 +00004773 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00004774
Chris Lattner70d67a92008-01-06 22:42:25 +00004775 // C99 6.5.15p5: "If both operands have void type, the result has void type."
Steve Naroffe701c0a2008-05-12 21:44:38 +00004776 // The following || allows only one side to be void (a GCC-ism).
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004777 if (LHSTy->isVoidType() || RHSTy->isVoidType()) {
Richard Trieu26f96072011-09-02 01:51:02 +00004778 return checkConditionalVoidType(*this, LHS, RHS);
Steve Naroffe701c0a2008-05-12 21:44:38 +00004779 }
Richard Trieu26f96072011-09-02 01:51:02 +00004780
Steve Naroffb6d54e52008-01-08 01:11:38 +00004781 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has
4782 // the type of the other operand."
Richard Trieu26f96072011-09-02 01:51:02 +00004783 if (!checkConditionalNullPointer(*this, RHS, LHSTy)) return LHSTy;
4784 if (!checkConditionalNullPointer(*this, LHS, RHSTy)) return RHSTy;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004785
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004786 // All objective-c pointer type analysis is done here.
4787 QualType compositeType = FindCompositeObjCPointerType(LHS, RHS,
4788 QuestionLoc);
John Wiegley429bb272011-04-08 18:41:53 +00004789 if (LHS.isInvalid() || RHS.isInvalid())
4790 return QualType();
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004791 if (!compositeType.isNull())
4792 return compositeType;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004793
4794
Steve Naroff7154a772009-07-01 14:36:47 +00004795 // Handle block pointer types.
Richard Trieu26f96072011-09-02 01:51:02 +00004796 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType())
4797 return checkConditionalBlockPointerCompatibility(*this, LHS, RHS,
4798 QuestionLoc);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004799
Steve Naroff7154a772009-07-01 14:36:47 +00004800 // Check constraints for C object pointers types (C99 6.5.15p3,6).
Richard Trieu26f96072011-09-02 01:51:02 +00004801 if (LHSTy->isPointerType() && RHSTy->isPointerType())
4802 return checkConditionalObjectPointersCompatibility(*this, LHS, RHS,
4803 QuestionLoc);
Mike Stump1eb44332009-09-09 15:08:12 +00004804
John McCall404cd162010-11-13 01:35:44 +00004805 // GCC compatibility: soften pointer/integer mismatch. Note that
4806 // null pointers have been filtered out by this point.
Richard Trieu26f96072011-09-02 01:51:02 +00004807 if (checkPointerIntegerMismatch(*this, LHS, RHS.get(), QuestionLoc,
4808 /*isIntFirstExpr=*/true))
Steve Naroff7154a772009-07-01 14:36:47 +00004809 return RHSTy;
Richard Trieu26f96072011-09-02 01:51:02 +00004810 if (checkPointerIntegerMismatch(*this, RHS, LHS.get(), QuestionLoc,
4811 /*isIntFirstExpr=*/false))
Steve Naroff7154a772009-07-01 14:36:47 +00004812 return LHSTy;
Daniel Dunbar5e155f02008-09-11 23:12:46 +00004813
Chandler Carruth82214a82011-02-18 23:54:50 +00004814 // Emit a better diagnostic if one of the expressions is a null pointer
4815 // constant and the other is not a pointer type. In this case, the user most
4816 // likely forgot to take the address of the other expression.
John Wiegley429bb272011-04-08 18:41:53 +00004817 if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
Chandler Carruth82214a82011-02-18 23:54:50 +00004818 return QualType();
4819
Chris Lattner70d67a92008-01-06 22:42:25 +00004820 // Otherwise, the operands are not compatible.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004821 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
Richard Trieu67e29332011-08-02 04:35:43 +00004822 << LHSTy << RHSTy << LHS.get()->getSourceRange()
4823 << RHS.get()->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00004824 return QualType();
4825}
4826
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004827/// FindCompositeObjCPointerType - Helper method to find composite type of
4828/// two objective-c pointer types of the two input expressions.
John Wiegley429bb272011-04-08 18:41:53 +00004829QualType Sema::FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
Richard Trieu67e29332011-08-02 04:35:43 +00004830 SourceLocation QuestionLoc) {
John Wiegley429bb272011-04-08 18:41:53 +00004831 QualType LHSTy = LHS.get()->getType();
4832 QualType RHSTy = RHS.get()->getType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004833
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004834 // Handle things like Class and struct objc_class*. Here we case the result
4835 // to the pseudo-builtin, because that will be implicitly cast back to the
4836 // redefinition type if an attempt is made to access its fields.
4837 if (LHSTy->isObjCClassType() &&
Douglas Gregor01a4cf12011-08-11 20:58:55 +00004838 (Context.hasSameType(RHSTy, Context.getObjCClassRedefinitionType()))) {
John McCall1d9b3b22011-09-09 05:25:32 +00004839 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_CPointerToObjCPointerCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004840 return LHSTy;
4841 }
4842 if (RHSTy->isObjCClassType() &&
Douglas Gregor01a4cf12011-08-11 20:58:55 +00004843 (Context.hasSameType(LHSTy, Context.getObjCClassRedefinitionType()))) {
John McCall1d9b3b22011-09-09 05:25:32 +00004844 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_CPointerToObjCPointerCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004845 return RHSTy;
4846 }
4847 // And the same for struct objc_object* / id
4848 if (LHSTy->isObjCIdType() &&
Douglas Gregor01a4cf12011-08-11 20:58:55 +00004849 (Context.hasSameType(RHSTy, Context.getObjCIdRedefinitionType()))) {
John McCall1d9b3b22011-09-09 05:25:32 +00004850 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_CPointerToObjCPointerCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004851 return LHSTy;
4852 }
4853 if (RHSTy->isObjCIdType() &&
Douglas Gregor01a4cf12011-08-11 20:58:55 +00004854 (Context.hasSameType(LHSTy, Context.getObjCIdRedefinitionType()))) {
John McCall1d9b3b22011-09-09 05:25:32 +00004855 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_CPointerToObjCPointerCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004856 return RHSTy;
4857 }
4858 // And the same for struct objc_selector* / SEL
4859 if (Context.isObjCSelType(LHSTy) &&
Douglas Gregor01a4cf12011-08-11 20:58:55 +00004860 (Context.hasSameType(RHSTy, Context.getObjCSelRedefinitionType()))) {
John Wiegley429bb272011-04-08 18:41:53 +00004861 RHS = ImpCastExprToType(RHS.take(), LHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004862 return LHSTy;
4863 }
4864 if (Context.isObjCSelType(RHSTy) &&
Douglas Gregor01a4cf12011-08-11 20:58:55 +00004865 (Context.hasSameType(LHSTy, Context.getObjCSelRedefinitionType()))) {
John Wiegley429bb272011-04-08 18:41:53 +00004866 LHS = ImpCastExprToType(LHS.take(), RHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004867 return RHSTy;
4868 }
4869 // Check constraints for Objective-C object pointers types.
4870 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004871
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004872 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
4873 // Two identical object pointer types are always compatible.
4874 return LHSTy;
4875 }
John McCall1d9b3b22011-09-09 05:25:32 +00004876 const ObjCObjectPointerType *LHSOPT = LHSTy->castAs<ObjCObjectPointerType>();
4877 const ObjCObjectPointerType *RHSOPT = RHSTy->castAs<ObjCObjectPointerType>();
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004878 QualType compositeType = LHSTy;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004879
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004880 // If both operands are interfaces and either operand can be
4881 // assigned to the other, use that type as the composite
4882 // type. This allows
4883 // xxx ? (A*) a : (B*) b
4884 // where B is a subclass of A.
4885 //
4886 // Additionally, as for assignment, if either type is 'id'
4887 // allow silent coercion. Finally, if the types are
4888 // incompatible then make sure to use 'id' as the composite
4889 // type so the result is acceptable for sending messages to.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004890
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004891 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'.
4892 // It could return the composite type.
4893 if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) {
4894 compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy;
4895 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) {
4896 compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy;
4897 } else if ((LHSTy->isObjCQualifiedIdType() ||
4898 RHSTy->isObjCQualifiedIdType()) &&
4899 Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) {
4900 // Need to handle "id<xx>" explicitly.
4901 // GCC allows qualified id and any Objective-C type to devolve to
4902 // id. Currently localizing to here until clear this should be
4903 // part of ObjCQualifiedIdTypesAreCompatible.
4904 compositeType = Context.getObjCIdType();
4905 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) {
4906 compositeType = Context.getObjCIdType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004907 } else if (!(compositeType =
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004908 Context.areCommonBaseCompatible(LHSOPT, RHSOPT)).isNull())
4909 ;
4910 else {
4911 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands)
4912 << LHSTy << RHSTy
John Wiegley429bb272011-04-08 18:41:53 +00004913 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004914 QualType incompatTy = Context.getObjCIdType();
John Wiegley429bb272011-04-08 18:41:53 +00004915 LHS = ImpCastExprToType(LHS.take(), incompatTy, CK_BitCast);
4916 RHS = ImpCastExprToType(RHS.take(), incompatTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004917 return incompatTy;
4918 }
4919 // The object pointer types are compatible.
John Wiegley429bb272011-04-08 18:41:53 +00004920 LHS = ImpCastExprToType(LHS.take(), compositeType, CK_BitCast);
4921 RHS = ImpCastExprToType(RHS.take(), compositeType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004922 return compositeType;
4923 }
4924 // Check Objective-C object pointer types and 'void *'
4925 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) {
4926 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
4927 QualType rhptee = RHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
4928 QualType destPointee
4929 = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
4930 QualType destType = Context.getPointerType(destPointee);
4931 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00004932 LHS = ImpCastExprToType(LHS.take(), destType, CK_NoOp);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004933 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00004934 RHS = ImpCastExprToType(RHS.take(), destType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004935 return destType;
4936 }
4937 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) {
4938 QualType lhptee = LHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
4939 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
4940 QualType destPointee
4941 = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
4942 QualType destType = Context.getPointerType(destPointee);
4943 // Add qualifiers if necessary.
John Wiegley429bb272011-04-08 18:41:53 +00004944 RHS = ImpCastExprToType(RHS.take(), destType, CK_NoOp);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004945 // Promote to void*.
John Wiegley429bb272011-04-08 18:41:53 +00004946 LHS = ImpCastExprToType(LHS.take(), destType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004947 return destType;
4948 }
4949 return QualType();
4950}
4951
Chandler Carruthf0b60d62011-06-16 01:05:14 +00004952/// SuggestParentheses - Emit a note with a fixit hint that wraps
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004953/// ParenRange in parentheses.
4954static void SuggestParentheses(Sema &Self, SourceLocation Loc,
Chandler Carruthf0b60d62011-06-16 01:05:14 +00004955 const PartialDiagnostic &Note,
4956 SourceRange ParenRange) {
4957 SourceLocation EndLoc = Self.PP.getLocForEndOfToken(ParenRange.getEnd());
4958 if (ParenRange.getBegin().isFileID() && ParenRange.getEnd().isFileID() &&
4959 EndLoc.isValid()) {
4960 Self.Diag(Loc, Note)
4961 << FixItHint::CreateInsertion(ParenRange.getBegin(), "(")
4962 << FixItHint::CreateInsertion(EndLoc, ")");
4963 } else {
4964 // We can't display the parentheses, so just show the bare note.
4965 Self.Diag(Loc, Note) << ParenRange;
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004966 }
Hans Wennborg9cfdae32011-06-03 18:00:36 +00004967}
4968
4969static bool IsArithmeticOp(BinaryOperatorKind Opc) {
4970 return Opc >= BO_Mul && Opc <= BO_Shr;
4971}
4972
Hans Wennborg2f072b42011-06-09 17:06:51 +00004973/// IsArithmeticBinaryExpr - Returns true if E is an arithmetic binary
4974/// expression, either using a built-in or overloaded operator,
Richard Trieu33fc7572011-09-06 20:06:39 +00004975/// and sets *OpCode to the opcode and *RHSExprs to the right-hand side
4976/// expression.
Hans Wennborg2f072b42011-06-09 17:06:51 +00004977static bool IsArithmeticBinaryExpr(Expr *E, BinaryOperatorKind *Opcode,
Richard Trieu33fc7572011-09-06 20:06:39 +00004978 Expr **RHSExprs) {
Hans Wennborgcb4d7c22011-09-12 12:07:30 +00004979 // Don't strip parenthesis: we should not warn if E is in parenthesis.
4980 E = E->IgnoreImpCasts();
Hans Wennborg2f072b42011-06-09 17:06:51 +00004981 E = E->IgnoreConversionOperator();
Hans Wennborgcb4d7c22011-09-12 12:07:30 +00004982 E = E->IgnoreImpCasts();
Hans Wennborg2f072b42011-06-09 17:06:51 +00004983
4984 // Built-in binary operator.
4985 if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E)) {
4986 if (IsArithmeticOp(OP->getOpcode())) {
4987 *Opcode = OP->getOpcode();
Richard Trieu33fc7572011-09-06 20:06:39 +00004988 *RHSExprs = OP->getRHS();
Hans Wennborg2f072b42011-06-09 17:06:51 +00004989 return true;
4990 }
4991 }
4992
4993 // Overloaded operator.
4994 if (CXXOperatorCallExpr *Call = dyn_cast<CXXOperatorCallExpr>(E)) {
4995 if (Call->getNumArgs() != 2)
4996 return false;
4997
4998 // Make sure this is really a binary operator that is safe to pass into
4999 // BinaryOperator::getOverloadedOpcode(), e.g. it's not a subscript op.
5000 OverloadedOperatorKind OO = Call->getOperator();
5001 if (OO < OO_Plus || OO > OO_Arrow)
5002 return false;
5003
5004 BinaryOperatorKind OpKind = BinaryOperator::getOverloadedOpcode(OO);
5005 if (IsArithmeticOp(OpKind)) {
5006 *Opcode = OpKind;
Richard Trieu33fc7572011-09-06 20:06:39 +00005007 *RHSExprs = Call->getArg(1);
Hans Wennborg2f072b42011-06-09 17:06:51 +00005008 return true;
5009 }
5010 }
5011
5012 return false;
5013}
5014
Hans Wennborg9cfdae32011-06-03 18:00:36 +00005015static bool IsLogicOp(BinaryOperatorKind Opc) {
5016 return (Opc >= BO_LT && Opc <= BO_NE) || (Opc >= BO_LAnd && Opc <= BO_LOr);
5017}
5018
Hans Wennborg2f072b42011-06-09 17:06:51 +00005019/// ExprLooksBoolean - Returns true if E looks boolean, i.e. it has boolean type
5020/// or is a logical expression such as (x==y) which has int type, but is
5021/// commonly interpreted as boolean.
5022static bool ExprLooksBoolean(Expr *E) {
5023 E = E->IgnoreParenImpCasts();
5024
5025 if (E->getType()->isBooleanType())
5026 return true;
5027 if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E))
5028 return IsLogicOp(OP->getOpcode());
5029 if (UnaryOperator *OP = dyn_cast<UnaryOperator>(E))
5030 return OP->getOpcode() == UO_LNot;
5031
5032 return false;
5033}
5034
Hans Wennborg9cfdae32011-06-03 18:00:36 +00005035/// DiagnoseConditionalPrecedence - Emit a warning when a conditional operator
5036/// and binary operator are mixed in a way that suggests the programmer assumed
5037/// the conditional operator has higher precedence, for example:
5038/// "int x = a + someBinaryCondition ? 1 : 2".
5039static void DiagnoseConditionalPrecedence(Sema &Self,
5040 SourceLocation OpLoc,
Chandler Carruth43bc78d2011-06-16 01:05:08 +00005041 Expr *Condition,
Richard Trieu33fc7572011-09-06 20:06:39 +00005042 Expr *LHSExpr,
5043 Expr *RHSExpr) {
Hans Wennborg2f072b42011-06-09 17:06:51 +00005044 BinaryOperatorKind CondOpcode;
5045 Expr *CondRHS;
Hans Wennborg9cfdae32011-06-03 18:00:36 +00005046
Chandler Carruth43bc78d2011-06-16 01:05:08 +00005047 if (!IsArithmeticBinaryExpr(Condition, &CondOpcode, &CondRHS))
Hans Wennborg2f072b42011-06-09 17:06:51 +00005048 return;
5049 if (!ExprLooksBoolean(CondRHS))
5050 return;
Hans Wennborg9cfdae32011-06-03 18:00:36 +00005051
Hans Wennborg2f072b42011-06-09 17:06:51 +00005052 // The condition is an arithmetic binary expression, with a right-
5053 // hand side that looks boolean, so warn.
Hans Wennborg9cfdae32011-06-03 18:00:36 +00005054
Chandler Carruthf0b60d62011-06-16 01:05:14 +00005055 Self.Diag(OpLoc, diag::warn_precedence_conditional)
Chandler Carruth43bc78d2011-06-16 01:05:08 +00005056 << Condition->getSourceRange()
Hans Wennborg2f072b42011-06-09 17:06:51 +00005057 << BinaryOperator::getOpcodeStr(CondOpcode);
Hans Wennborg9cfdae32011-06-03 18:00:36 +00005058
Chandler Carruthf0b60d62011-06-16 01:05:14 +00005059 SuggestParentheses(Self, OpLoc,
5060 Self.PDiag(diag::note_precedence_conditional_silence)
5061 << BinaryOperator::getOpcodeStr(CondOpcode),
5062 SourceRange(Condition->getLocStart(), Condition->getLocEnd()));
Chandler Carruth9d5353c2011-06-21 23:04:18 +00005063
5064 SuggestParentheses(Self, OpLoc,
5065 Self.PDiag(diag::note_precedence_conditional_first),
Richard Trieu33fc7572011-09-06 20:06:39 +00005066 SourceRange(CondRHS->getLocStart(), RHSExpr->getLocEnd()));
Hans Wennborg9cfdae32011-06-03 18:00:36 +00005067}
5068
Steve Narofff69936d2007-09-16 03:34:24 +00005069/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null
Reid Spencer5f016e22007-07-11 17:01:13 +00005070/// in the case of a the GNU conditional expr extension.
John McCall60d7b3a2010-08-24 06:29:42 +00005071ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc,
John McCall56ca35d2011-02-17 10:25:35 +00005072 SourceLocation ColonLoc,
5073 Expr *CondExpr, Expr *LHSExpr,
5074 Expr *RHSExpr) {
Chris Lattnera21ddb32007-11-26 01:40:58 +00005075 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS
5076 // was the condition.
John McCall56ca35d2011-02-17 10:25:35 +00005077 OpaqueValueExpr *opaqueValue = 0;
5078 Expr *commonExpr = 0;
5079 if (LHSExpr == 0) {
5080 commonExpr = CondExpr;
5081
5082 // We usually want to apply unary conversions *before* saving, except
5083 // in the special case of a C++ l-value conditional.
5084 if (!(getLangOptions().CPlusPlus
5085 && !commonExpr->isTypeDependent()
5086 && commonExpr->getValueKind() == RHSExpr->getValueKind()
5087 && commonExpr->isGLValue()
5088 && commonExpr->isOrdinaryOrBitFieldObject()
5089 && RHSExpr->isOrdinaryOrBitFieldObject()
5090 && Context.hasSameType(commonExpr->getType(), RHSExpr->getType()))) {
John Wiegley429bb272011-04-08 18:41:53 +00005091 ExprResult commonRes = UsualUnaryConversions(commonExpr);
5092 if (commonRes.isInvalid())
5093 return ExprError();
5094 commonExpr = commonRes.take();
John McCall56ca35d2011-02-17 10:25:35 +00005095 }
5096
5097 opaqueValue = new (Context) OpaqueValueExpr(commonExpr->getExprLoc(),
5098 commonExpr->getType(),
5099 commonExpr->getValueKind(),
5100 commonExpr->getObjectKind());
5101 LHSExpr = CondExpr = opaqueValue;
Fariborz Jahanianf9b949f2010-08-31 18:02:20 +00005102 }
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005103
John McCallf89e55a2010-11-18 06:31:45 +00005104 ExprValueKind VK = VK_RValue;
John McCall09431682010-11-18 19:01:18 +00005105 ExprObjectKind OK = OK_Ordinary;
John Wiegley429bb272011-04-08 18:41:53 +00005106 ExprResult Cond = Owned(CondExpr), LHS = Owned(LHSExpr), RHS = Owned(RHSExpr);
5107 QualType result = CheckConditionalOperands(Cond, LHS, RHS,
John McCall56ca35d2011-02-17 10:25:35 +00005108 VK, OK, QuestionLoc);
John Wiegley429bb272011-04-08 18:41:53 +00005109 if (result.isNull() || Cond.isInvalid() || LHS.isInvalid() ||
5110 RHS.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005111 return ExprError();
5112
Hans Wennborg9cfdae32011-06-03 18:00:36 +00005113 DiagnoseConditionalPrecedence(*this, QuestionLoc, Cond.get(), LHS.get(),
5114 RHS.get());
5115
John McCall56ca35d2011-02-17 10:25:35 +00005116 if (!commonExpr)
John Wiegley429bb272011-04-08 18:41:53 +00005117 return Owned(new (Context) ConditionalOperator(Cond.take(), QuestionLoc,
5118 LHS.take(), ColonLoc,
5119 RHS.take(), result, VK, OK));
John McCall56ca35d2011-02-17 10:25:35 +00005120
5121 return Owned(new (Context)
John Wiegley429bb272011-04-08 18:41:53 +00005122 BinaryConditionalOperator(commonExpr, opaqueValue, Cond.take(), LHS.take(),
Richard Trieu67e29332011-08-02 04:35:43 +00005123 RHS.take(), QuestionLoc, ColonLoc, result, VK,
5124 OK));
Reid Spencer5f016e22007-07-11 17:01:13 +00005125}
5126
John McCalle4be87e2011-01-31 23:13:11 +00005127// checkPointerTypesForAssignment - This is a very tricky routine (despite
Mike Stumpeed9cac2009-02-19 03:04:26 +00005128// being closely modeled after the C99 spec:-). The odd characteristic of this
Reid Spencer5f016e22007-07-11 17:01:13 +00005129// routine is it effectively iqnores the qualifiers on the top level pointee.
5130// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3].
5131// FIXME: add a couple examples in this comment.
John McCalle4be87e2011-01-31 23:13:11 +00005132static Sema::AssignConvertType
Richard Trieu1da27a12011-09-06 20:21:22 +00005133checkPointerTypesForAssignment(Sema &S, QualType LHSType, QualType RHSType) {
5134 assert(LHSType.isCanonical() && "LHS not canonicalized!");
5135 assert(RHSType.isCanonical() && "RHS not canonicalized!");
Mike Stumpeed9cac2009-02-19 03:04:26 +00005136
Reid Spencer5f016e22007-07-11 17:01:13 +00005137 // get the "pointed to" type (ignoring qualifiers at the top level)
John McCall86c05f32011-02-01 00:10:29 +00005138 const Type *lhptee, *rhptee;
5139 Qualifiers lhq, rhq;
Richard Trieu1da27a12011-09-06 20:21:22 +00005140 llvm::tie(lhptee, lhq) = cast<PointerType>(LHSType)->getPointeeType().split();
5141 llvm::tie(rhptee, rhq) = cast<PointerType>(RHSType)->getPointeeType().split();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005142
John McCalle4be87e2011-01-31 23:13:11 +00005143 Sema::AssignConvertType ConvTy = Sema::Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005144
5145 // C99 6.5.16.1p1: This following citation is common to constraints
5146 // 3 & 4 (below). ...and the type *pointed to* by the left has all the
5147 // qualifiers of the type *pointed to* by the right;
John McCall86c05f32011-02-01 00:10:29 +00005148 Qualifiers lq;
5149
John McCallf85e1932011-06-15 23:02:42 +00005150 // As a special case, 'non-__weak A *' -> 'non-__weak const *' is okay.
5151 if (lhq.getObjCLifetime() != rhq.getObjCLifetime() &&
5152 lhq.compatiblyIncludesObjCLifetime(rhq)) {
5153 // Ignore lifetime for further calculation.
5154 lhq.removeObjCLifetime();
5155 rhq.removeObjCLifetime();
5156 }
5157
John McCall86c05f32011-02-01 00:10:29 +00005158 if (!lhq.compatiblyIncludes(rhq)) {
5159 // Treat address-space mismatches as fatal. TODO: address subspaces
5160 if (lhq.getAddressSpace() != rhq.getAddressSpace())
5161 ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
5162
John McCallf85e1932011-06-15 23:02:42 +00005163 // It's okay to add or remove GC or lifetime qualifiers when converting to
John McCall22348732011-03-26 02:56:45 +00005164 // and from void*.
John McCallf85e1932011-06-15 23:02:42 +00005165 else if (lhq.withoutObjCGCAttr().withoutObjCGLifetime()
5166 .compatiblyIncludes(
5167 rhq.withoutObjCGCAttr().withoutObjCGLifetime())
John McCall22348732011-03-26 02:56:45 +00005168 && (lhptee->isVoidType() || rhptee->isVoidType()))
5169 ; // keep old
5170
John McCallf85e1932011-06-15 23:02:42 +00005171 // Treat lifetime mismatches as fatal.
5172 else if (lhq.getObjCLifetime() != rhq.getObjCLifetime())
5173 ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
5174
John McCall86c05f32011-02-01 00:10:29 +00005175 // For GCC compatibility, other qualifier mismatches are treated
5176 // as still compatible in C.
5177 else ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
5178 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005179
Mike Stumpeed9cac2009-02-19 03:04:26 +00005180 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or
5181 // incomplete type and the other is a pointer to a qualified or unqualified
Reid Spencer5f016e22007-07-11 17:01:13 +00005182 // version of void...
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005183 if (lhptee->isVoidType()) {
Chris Lattnerd805bec2008-04-02 06:59:01 +00005184 if (rhptee->isIncompleteOrObjectType())
Chris Lattner5cf216b2008-01-04 18:04:52 +00005185 return ConvTy;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005186
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005187 // As an extension, we allow cast to/from void* to function pointer.
Chris Lattnerd805bec2008-04-02 06:59:01 +00005188 assert(rhptee->isFunctionType());
John McCalle4be87e2011-01-31 23:13:11 +00005189 return Sema::FunctionVoidPointer;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005190 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005191
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005192 if (rhptee->isVoidType()) {
Chris Lattnerd805bec2008-04-02 06:59:01 +00005193 if (lhptee->isIncompleteOrObjectType())
Chris Lattner5cf216b2008-01-04 18:04:52 +00005194 return ConvTy;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005195
5196 // As an extension, we allow cast to/from void* to function pointer.
Chris Lattnerd805bec2008-04-02 06:59:01 +00005197 assert(lhptee->isFunctionType());
John McCalle4be87e2011-01-31 23:13:11 +00005198 return Sema::FunctionVoidPointer;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005199 }
John McCall86c05f32011-02-01 00:10:29 +00005200
Mike Stumpeed9cac2009-02-19 03:04:26 +00005201 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or
Reid Spencer5f016e22007-07-11 17:01:13 +00005202 // unqualified versions of compatible types, ...
John McCall86c05f32011-02-01 00:10:29 +00005203 QualType ltrans = QualType(lhptee, 0), rtrans = QualType(rhptee, 0);
5204 if (!S.Context.typesAreCompatible(ltrans, rtrans)) {
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005205 // Check if the pointee types are compatible ignoring the sign.
5206 // We explicitly check for char so that we catch "char" vs
5207 // "unsigned char" on systems where "char" is unsigned.
Chris Lattner6a2b9262009-10-17 20:33:28 +00005208 if (lhptee->isCharType())
John McCall86c05f32011-02-01 00:10:29 +00005209 ltrans = S.Context.UnsignedCharTy;
Douglas Gregorf6094622010-07-23 15:58:24 +00005210 else if (lhptee->hasSignedIntegerRepresentation())
John McCall86c05f32011-02-01 00:10:29 +00005211 ltrans = S.Context.getCorrespondingUnsignedType(ltrans);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005212
Chris Lattner6a2b9262009-10-17 20:33:28 +00005213 if (rhptee->isCharType())
John McCall86c05f32011-02-01 00:10:29 +00005214 rtrans = S.Context.UnsignedCharTy;
Douglas Gregorf6094622010-07-23 15:58:24 +00005215 else if (rhptee->hasSignedIntegerRepresentation())
John McCall86c05f32011-02-01 00:10:29 +00005216 rtrans = S.Context.getCorrespondingUnsignedType(rtrans);
Chris Lattner6a2b9262009-10-17 20:33:28 +00005217
John McCall86c05f32011-02-01 00:10:29 +00005218 if (ltrans == rtrans) {
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005219 // Types are compatible ignoring the sign. Qualifier incompatibility
5220 // takes priority over sign incompatibility because the sign
5221 // warning can be disabled.
John McCalle4be87e2011-01-31 23:13:11 +00005222 if (ConvTy != Sema::Compatible)
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005223 return ConvTy;
John McCall86c05f32011-02-01 00:10:29 +00005224
John McCalle4be87e2011-01-31 23:13:11 +00005225 return Sema::IncompatiblePointerSign;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005226 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005227
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00005228 // If we are a multi-level pointer, it's possible that our issue is simply
5229 // one of qualification - e.g. char ** -> const char ** is not allowed. If
5230 // the eventual target type is the same and the pointers have the same
5231 // level of indirection, this must be the issue.
John McCalle4be87e2011-01-31 23:13:11 +00005232 if (isa<PointerType>(lhptee) && isa<PointerType>(rhptee)) {
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00005233 do {
John McCall86c05f32011-02-01 00:10:29 +00005234 lhptee = cast<PointerType>(lhptee)->getPointeeType().getTypePtr();
5235 rhptee = cast<PointerType>(rhptee)->getPointeeType().getTypePtr();
John McCalle4be87e2011-01-31 23:13:11 +00005236 } while (isa<PointerType>(lhptee) && isa<PointerType>(rhptee));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005237
John McCall86c05f32011-02-01 00:10:29 +00005238 if (lhptee == rhptee)
John McCalle4be87e2011-01-31 23:13:11 +00005239 return Sema::IncompatibleNestedPointerQualifiers;
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00005240 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005241
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005242 // General pointer incompatibility takes priority over qualifiers.
John McCalle4be87e2011-01-31 23:13:11 +00005243 return Sema::IncompatiblePointer;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005244 }
Fariborz Jahanian53c81672011-10-05 00:05:34 +00005245 if (!S.getLangOptions().CPlusPlus &&
5246 S.IsNoReturnConversion(ltrans, rtrans, ltrans))
5247 return Sema::IncompatiblePointer;
Chris Lattner5cf216b2008-01-04 18:04:52 +00005248 return ConvTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00005249}
5250
John McCalle4be87e2011-01-31 23:13:11 +00005251/// checkBlockPointerTypesForAssignment - This routine determines whether two
Steve Naroff1c7d0672008-09-04 15:10:53 +00005252/// block pointer types are compatible or whether a block and normal pointer
5253/// are compatible. It is more restrict than comparing two function pointer
5254// types.
John McCalle4be87e2011-01-31 23:13:11 +00005255static Sema::AssignConvertType
Richard Trieu1da27a12011-09-06 20:21:22 +00005256checkBlockPointerTypesForAssignment(Sema &S, QualType LHSType,
5257 QualType RHSType) {
5258 assert(LHSType.isCanonical() && "LHS not canonicalized!");
5259 assert(RHSType.isCanonical() && "RHS not canonicalized!");
John McCalle4be87e2011-01-31 23:13:11 +00005260
Steve Naroff1c7d0672008-09-04 15:10:53 +00005261 QualType lhptee, rhptee;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005262
Steve Naroff1c7d0672008-09-04 15:10:53 +00005263 // get the "pointed to" type (ignoring qualifiers at the top level)
Richard Trieu1da27a12011-09-06 20:21:22 +00005264 lhptee = cast<BlockPointerType>(LHSType)->getPointeeType();
5265 rhptee = cast<BlockPointerType>(RHSType)->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005266
John McCalle4be87e2011-01-31 23:13:11 +00005267 // In C++, the types have to match exactly.
5268 if (S.getLangOptions().CPlusPlus)
5269 return Sema::IncompatibleBlockPointer;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005270
John McCalle4be87e2011-01-31 23:13:11 +00005271 Sema::AssignConvertType ConvTy = Sema::Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005272
Steve Naroff1c7d0672008-09-04 15:10:53 +00005273 // For blocks we enforce that qualifiers are identical.
John McCalle4be87e2011-01-31 23:13:11 +00005274 if (lhptee.getLocalQualifiers() != rhptee.getLocalQualifiers())
5275 ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005276
Richard Trieu1da27a12011-09-06 20:21:22 +00005277 if (!S.Context.typesAreBlockPointerCompatible(LHSType, RHSType))
John McCalle4be87e2011-01-31 23:13:11 +00005278 return Sema::IncompatibleBlockPointer;
5279
Steve Naroff1c7d0672008-09-04 15:10:53 +00005280 return ConvTy;
5281}
5282
John McCalle4be87e2011-01-31 23:13:11 +00005283/// checkObjCPointerTypesForAssignment - Compares two objective-c pointer types
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005284/// for assignment compatibility.
John McCalle4be87e2011-01-31 23:13:11 +00005285static Sema::AssignConvertType
Richard Trieu1da27a12011-09-06 20:21:22 +00005286checkObjCPointerTypesForAssignment(Sema &S, QualType LHSType,
5287 QualType RHSType) {
5288 assert(LHSType.isCanonical() && "LHS was not canonicalized!");
5289 assert(RHSType.isCanonical() && "RHS was not canonicalized!");
John McCalle4be87e2011-01-31 23:13:11 +00005290
Richard Trieu1da27a12011-09-06 20:21:22 +00005291 if (LHSType->isObjCBuiltinType()) {
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00005292 // Class is not compatible with ObjC object pointers.
Richard Trieu1da27a12011-09-06 20:21:22 +00005293 if (LHSType->isObjCClassType() && !RHSType->isObjCBuiltinType() &&
5294 !RHSType->isObjCQualifiedClassType())
John McCalle4be87e2011-01-31 23:13:11 +00005295 return Sema::IncompatiblePointer;
5296 return Sema::Compatible;
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00005297 }
Richard Trieu1da27a12011-09-06 20:21:22 +00005298 if (RHSType->isObjCBuiltinType()) {
Richard Trieu1da27a12011-09-06 20:21:22 +00005299 if (RHSType->isObjCClassType() && !LHSType->isObjCBuiltinType() &&
5300 !LHSType->isObjCQualifiedClassType())
Fariborz Jahanian412a4962011-09-15 20:40:18 +00005301 return Sema::IncompatiblePointer;
John McCalle4be87e2011-01-31 23:13:11 +00005302 return Sema::Compatible;
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00005303 }
Richard Trieu1da27a12011-09-06 20:21:22 +00005304 QualType lhptee = LHSType->getAs<ObjCObjectPointerType>()->getPointeeType();
5305 QualType rhptee = RHSType->getAs<ObjCObjectPointerType>()->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005306
Fariborz Jahanianf2b4f7b2012-01-12 22:12:08 +00005307 if (!lhptee.isAtLeastAsQualifiedAs(rhptee) &&
5308 // make an exception for id<P>
5309 !LHSType->isObjCQualifiedIdType())
John McCalle4be87e2011-01-31 23:13:11 +00005310 return Sema::CompatiblePointerDiscardsQualifiers;
5311
Richard Trieu1da27a12011-09-06 20:21:22 +00005312 if (S.Context.typesAreCompatible(LHSType, RHSType))
John McCalle4be87e2011-01-31 23:13:11 +00005313 return Sema::Compatible;
Richard Trieu1da27a12011-09-06 20:21:22 +00005314 if (LHSType->isObjCQualifiedIdType() || RHSType->isObjCQualifiedIdType())
John McCalle4be87e2011-01-31 23:13:11 +00005315 return Sema::IncompatibleObjCQualifiedId;
5316 return Sema::IncompatiblePointer;
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005317}
5318
John McCall1c23e912010-11-16 02:32:08 +00005319Sema::AssignConvertType
Douglas Gregorb608b982011-01-28 02:26:04 +00005320Sema::CheckAssignmentConstraints(SourceLocation Loc,
Richard Trieu1da27a12011-09-06 20:21:22 +00005321 QualType LHSType, QualType RHSType) {
John McCall1c23e912010-11-16 02:32:08 +00005322 // Fake up an opaque expression. We don't actually care about what
5323 // cast operations are required, so if CheckAssignmentConstraints
5324 // adds casts to this they'll be wasted, but fortunately that doesn't
5325 // usually happen on valid code.
Richard Trieu1da27a12011-09-06 20:21:22 +00005326 OpaqueValueExpr RHSExpr(Loc, RHSType, VK_RValue);
5327 ExprResult RHSPtr = &RHSExpr;
John McCall1c23e912010-11-16 02:32:08 +00005328 CastKind K = CK_Invalid;
5329
Richard Trieu1da27a12011-09-06 20:21:22 +00005330 return CheckAssignmentConstraints(LHSType, RHSPtr, K);
John McCall1c23e912010-11-16 02:32:08 +00005331}
5332
Mike Stumpeed9cac2009-02-19 03:04:26 +00005333/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently
5334/// has code to accommodate several GCC extensions when type checking
Reid Spencer5f016e22007-07-11 17:01:13 +00005335/// pointers. Here are some objectionable examples that GCC considers warnings:
5336///
5337/// int a, *pint;
5338/// short *pshort;
5339/// struct foo *pfoo;
5340///
5341/// pint = pshort; // warning: assignment from incompatible pointer type
5342/// a = pint; // warning: assignment makes integer from pointer without a cast
5343/// pint = a; // warning: assignment makes pointer from integer without a cast
5344/// pint = pfoo; // warning: assignment from incompatible pointer type
5345///
5346/// As a result, the code for dealing with pointers is more complex than the
Mike Stumpeed9cac2009-02-19 03:04:26 +00005347/// C99 spec dictates.
Reid Spencer5f016e22007-07-11 17:01:13 +00005348///
John McCalldaa8e4e2010-11-15 09:13:47 +00005349/// Sets 'Kind' for any result kind except Incompatible.
Chris Lattner5cf216b2008-01-04 18:04:52 +00005350Sema::AssignConvertType
Richard Trieufacef2e2011-09-06 20:30:53 +00005351Sema::CheckAssignmentConstraints(QualType LHSType, ExprResult &RHS,
John McCalldaa8e4e2010-11-15 09:13:47 +00005352 CastKind &Kind) {
Richard Trieufacef2e2011-09-06 20:30:53 +00005353 QualType RHSType = RHS.get()->getType();
5354 QualType OrigLHSType = LHSType;
John McCall1c23e912010-11-16 02:32:08 +00005355
Chris Lattnerfc144e22008-01-04 23:18:45 +00005356 // Get canonical types. We're not formatting these types, just comparing
5357 // them.
Richard Trieufacef2e2011-09-06 20:30:53 +00005358 LHSType = Context.getCanonicalType(LHSType).getUnqualifiedType();
5359 RHSType = Context.getCanonicalType(RHSType).getUnqualifiedType();
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005360
Eli Friedmanb001de72011-10-06 23:00:33 +00005361 // We can't do assignment from/to atomics yet.
5362 if (LHSType->isAtomicType())
5363 return Incompatible;
5364
John McCallb6cfa242011-01-31 22:28:28 +00005365 // Common case: no conversion required.
Richard Trieufacef2e2011-09-06 20:30:53 +00005366 if (LHSType == RHSType) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005367 Kind = CK_NoOp;
John McCalldaa8e4e2010-11-15 09:13:47 +00005368 return Compatible;
David Chisnall0f436562009-08-17 16:35:33 +00005369 }
5370
Douglas Gregor9d293df2008-10-28 00:22:11 +00005371 // If the left-hand side is a reference type, then we are in a
5372 // (rare!) case where we've allowed the use of references in C,
5373 // e.g., as a parameter type in a built-in function. In this case,
5374 // just make sure that the type referenced is compatible with the
5375 // right-hand side type. The caller is responsible for adjusting
Richard Trieufacef2e2011-09-06 20:30:53 +00005376 // LHSType so that the resulting expression does not have reference
Douglas Gregor9d293df2008-10-28 00:22:11 +00005377 // type.
Richard Trieufacef2e2011-09-06 20:30:53 +00005378 if (const ReferenceType *LHSTypeRef = LHSType->getAs<ReferenceType>()) {
5379 if (Context.typesAreCompatible(LHSTypeRef->getPointeeType(), RHSType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005380 Kind = CK_LValueBitCast;
Anders Carlsson793680e2007-10-12 23:56:29 +00005381 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005382 }
Chris Lattnerfc144e22008-01-04 23:18:45 +00005383 return Incompatible;
Fariborz Jahanian411f3732007-12-19 17:45:58 +00005384 }
John McCallb6cfa242011-01-31 22:28:28 +00005385
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005386 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type
5387 // to the same ExtVector type.
Richard Trieufacef2e2011-09-06 20:30:53 +00005388 if (LHSType->isExtVectorType()) {
5389 if (RHSType->isExtVectorType())
John McCalldaa8e4e2010-11-15 09:13:47 +00005390 return Incompatible;
Richard Trieufacef2e2011-09-06 20:30:53 +00005391 if (RHSType->isArithmeticType()) {
John McCall1c23e912010-11-16 02:32:08 +00005392 // CK_VectorSplat does T -> vector T, so first cast to the
5393 // element type.
Richard Trieufacef2e2011-09-06 20:30:53 +00005394 QualType elType = cast<ExtVectorType>(LHSType)->getElementType();
5395 if (elType != RHSType) {
John McCalla180f042011-10-06 23:25:11 +00005396 Kind = PrepareScalarCast(RHS, elType);
Richard Trieufacef2e2011-09-06 20:30:53 +00005397 RHS = ImpCastExprToType(RHS.take(), elType, Kind);
John McCall1c23e912010-11-16 02:32:08 +00005398 }
5399 Kind = CK_VectorSplat;
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005400 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005401 }
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005402 }
Mike Stump1eb44332009-09-09 15:08:12 +00005403
John McCallb6cfa242011-01-31 22:28:28 +00005404 // Conversions to or from vector type.
Richard Trieufacef2e2011-09-06 20:30:53 +00005405 if (LHSType->isVectorType() || RHSType->isVectorType()) {
5406 if (LHSType->isVectorType() && RHSType->isVectorType()) {
Bob Wilsonde3deea2010-12-02 00:25:15 +00005407 // Allow assignments of an AltiVec vector type to an equivalent GCC
5408 // vector type and vice versa
Richard Trieufacef2e2011-09-06 20:30:53 +00005409 if (Context.areCompatibleVectorTypes(LHSType, RHSType)) {
Bob Wilsonde3deea2010-12-02 00:25:15 +00005410 Kind = CK_BitCast;
5411 return Compatible;
5412 }
5413
Douglas Gregor255210e2010-08-06 10:14:59 +00005414 // If we are allowing lax vector conversions, and LHS and RHS are both
5415 // vectors, the total size only needs to be the same. This is a bitcast;
5416 // no bits are changed but the result type is different.
5417 if (getLangOptions().LaxVectorConversions &&
Richard Trieufacef2e2011-09-06 20:30:53 +00005418 (Context.getTypeSize(LHSType) == Context.getTypeSize(RHSType))) {
John McCall0c6d28d2010-11-15 10:08:00 +00005419 Kind = CK_BitCast;
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00005420 return IncompatibleVectors;
John McCalldaa8e4e2010-11-15 09:13:47 +00005421 }
Chris Lattnere8b3e962008-01-04 23:32:24 +00005422 }
5423 return Incompatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005424 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005425
John McCallb6cfa242011-01-31 22:28:28 +00005426 // Arithmetic conversions.
Richard Trieufacef2e2011-09-06 20:30:53 +00005427 if (LHSType->isArithmeticType() && RHSType->isArithmeticType() &&
5428 !(getLangOptions().CPlusPlus && LHSType->isEnumeralType())) {
John McCalla180f042011-10-06 23:25:11 +00005429 Kind = PrepareScalarCast(RHS, LHSType);
Reid Spencer5f016e22007-07-11 17:01:13 +00005430 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005431 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005432
John McCallb6cfa242011-01-31 22:28:28 +00005433 // Conversions to normal pointers.
Richard Trieufacef2e2011-09-06 20:30:53 +00005434 if (const PointerType *LHSPointer = dyn_cast<PointerType>(LHSType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005435 // U* -> T*
Richard Trieufacef2e2011-09-06 20:30:53 +00005436 if (isa<PointerType>(RHSType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005437 Kind = CK_BitCast;
Richard Trieufacef2e2011-09-06 20:30:53 +00005438 return checkPointerTypesForAssignment(*this, LHSType, RHSType);
John McCalldaa8e4e2010-11-15 09:13:47 +00005439 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005440
John McCallb6cfa242011-01-31 22:28:28 +00005441 // int -> T*
Richard Trieufacef2e2011-09-06 20:30:53 +00005442 if (RHSType->isIntegerType()) {
John McCallb6cfa242011-01-31 22:28:28 +00005443 Kind = CK_IntegralToPointer; // FIXME: null?
5444 return IntToPointer;
Steve Naroff14108da2009-07-10 23:34:53 +00005445 }
John McCallb6cfa242011-01-31 22:28:28 +00005446
5447 // C pointers are not compatible with ObjC object pointers,
5448 // with two exceptions:
Richard Trieufacef2e2011-09-06 20:30:53 +00005449 if (isa<ObjCObjectPointerType>(RHSType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005450 // - conversions to void*
Richard Trieufacef2e2011-09-06 20:30:53 +00005451 if (LHSPointer->getPointeeType()->isVoidType()) {
John McCall1d9b3b22011-09-09 05:25:32 +00005452 Kind = CK_BitCast;
John McCallb6cfa242011-01-31 22:28:28 +00005453 return Compatible;
5454 }
5455
5456 // - conversions from 'Class' to the redefinition type
Richard Trieufacef2e2011-09-06 20:30:53 +00005457 if (RHSType->isObjCClassType() &&
5458 Context.hasSameType(LHSType,
Douglas Gregor01a4cf12011-08-11 20:58:55 +00005459 Context.getObjCClassRedefinitionType())) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005460 Kind = CK_BitCast;
Douglas Gregor63a94902008-11-27 00:44:28 +00005461 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005462 }
Douglas Gregorc737acb2011-09-27 16:10:05 +00005463
John McCallb6cfa242011-01-31 22:28:28 +00005464 Kind = CK_BitCast;
5465 return IncompatiblePointer;
5466 }
5467
5468 // U^ -> void*
Richard Trieufacef2e2011-09-06 20:30:53 +00005469 if (RHSType->getAs<BlockPointerType>()) {
5470 if (LHSPointer->getPointeeType()->isVoidType()) {
John McCallb6cfa242011-01-31 22:28:28 +00005471 Kind = CK_BitCast;
Steve Naroffb4406862008-09-29 18:10:17 +00005472 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005473 }
Steve Naroffb4406862008-09-29 18:10:17 +00005474 }
John McCallb6cfa242011-01-31 22:28:28 +00005475
Steve Naroff1c7d0672008-09-04 15:10:53 +00005476 return Incompatible;
5477 }
5478
John McCallb6cfa242011-01-31 22:28:28 +00005479 // Conversions to block pointers.
Richard Trieufacef2e2011-09-06 20:30:53 +00005480 if (isa<BlockPointerType>(LHSType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005481 // U^ -> T^
Richard Trieufacef2e2011-09-06 20:30:53 +00005482 if (RHSType->isBlockPointerType()) {
John McCall1d9b3b22011-09-09 05:25:32 +00005483 Kind = CK_BitCast;
Richard Trieufacef2e2011-09-06 20:30:53 +00005484 return checkBlockPointerTypesForAssignment(*this, LHSType, RHSType);
John McCallb6cfa242011-01-31 22:28:28 +00005485 }
5486
5487 // int or null -> T^
Richard Trieufacef2e2011-09-06 20:30:53 +00005488 if (RHSType->isIntegerType()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005489 Kind = CK_IntegralToPointer; // FIXME: null
Eli Friedmand8f4f432009-02-25 04:20:42 +00005490 return IntToBlockPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00005491 }
5492
John McCallb6cfa242011-01-31 22:28:28 +00005493 // id -> T^
Richard Trieufacef2e2011-09-06 20:30:53 +00005494 if (getLangOptions().ObjC1 && RHSType->isObjCIdType()) {
John McCallb6cfa242011-01-31 22:28:28 +00005495 Kind = CK_AnyPointerToBlockPointerCast;
Steve Naroffb4406862008-09-29 18:10:17 +00005496 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00005497 }
Steve Naroffb4406862008-09-29 18:10:17 +00005498
John McCallb6cfa242011-01-31 22:28:28 +00005499 // void* -> T^
Richard Trieufacef2e2011-09-06 20:30:53 +00005500 if (const PointerType *RHSPT = RHSType->getAs<PointerType>())
John McCallb6cfa242011-01-31 22:28:28 +00005501 if (RHSPT->getPointeeType()->isVoidType()) {
5502 Kind = CK_AnyPointerToBlockPointerCast;
Douglas Gregor63a94902008-11-27 00:44:28 +00005503 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00005504 }
John McCalldaa8e4e2010-11-15 09:13:47 +00005505
Chris Lattnerfc144e22008-01-04 23:18:45 +00005506 return Incompatible;
5507 }
5508
John McCallb6cfa242011-01-31 22:28:28 +00005509 // Conversions to Objective-C pointers.
Richard Trieufacef2e2011-09-06 20:30:53 +00005510 if (isa<ObjCObjectPointerType>(LHSType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005511 // A* -> B*
Richard Trieufacef2e2011-09-06 20:30:53 +00005512 if (RHSType->isObjCObjectPointerType()) {
John McCallb6cfa242011-01-31 22:28:28 +00005513 Kind = CK_BitCast;
Fariborz Jahanian04e5a252011-07-07 18:55:47 +00005514 Sema::AssignConvertType result =
Richard Trieufacef2e2011-09-06 20:30:53 +00005515 checkObjCPointerTypesForAssignment(*this, LHSType, RHSType);
Fariborz Jahanian04e5a252011-07-07 18:55:47 +00005516 if (getLangOptions().ObjCAutoRefCount &&
5517 result == Compatible &&
Richard Trieufacef2e2011-09-06 20:30:53 +00005518 !CheckObjCARCUnavailableWeakConversion(OrigLHSType, RHSType))
Fariborz Jahanian7a084ec2011-07-07 23:04:17 +00005519 result = IncompatibleObjCWeakRef;
Fariborz Jahanian04e5a252011-07-07 18:55:47 +00005520 return result;
John McCallb6cfa242011-01-31 22:28:28 +00005521 }
5522
5523 // int or null -> A*
Richard Trieufacef2e2011-09-06 20:30:53 +00005524 if (RHSType->isIntegerType()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005525 Kind = CK_IntegralToPointer; // FIXME: null
Steve Naroff14108da2009-07-10 23:34:53 +00005526 return IntToPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00005527 }
5528
John McCallb6cfa242011-01-31 22:28:28 +00005529 // In general, C pointers are not compatible with ObjC object pointers,
5530 // with two exceptions:
Richard Trieufacef2e2011-09-06 20:30:53 +00005531 if (isa<PointerType>(RHSType)) {
John McCall1d9b3b22011-09-09 05:25:32 +00005532 Kind = CK_CPointerToObjCPointerCast;
5533
John McCallb6cfa242011-01-31 22:28:28 +00005534 // - conversions from 'void*'
Richard Trieufacef2e2011-09-06 20:30:53 +00005535 if (RHSType->isVoidPointerType()) {
Steve Naroff67ef8ea2009-07-20 17:56:53 +00005536 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00005537 }
5538
5539 // - conversions to 'Class' from its redefinition type
Richard Trieufacef2e2011-09-06 20:30:53 +00005540 if (LHSType->isObjCClassType() &&
5541 Context.hasSameType(RHSType,
Douglas Gregor01a4cf12011-08-11 20:58:55 +00005542 Context.getObjCClassRedefinitionType())) {
John McCallb6cfa242011-01-31 22:28:28 +00005543 return Compatible;
5544 }
5545
Steve Naroff67ef8ea2009-07-20 17:56:53 +00005546 return IncompatiblePointer;
Steve Naroff14108da2009-07-10 23:34:53 +00005547 }
John McCallb6cfa242011-01-31 22:28:28 +00005548
5549 // T^ -> A*
Richard Trieufacef2e2011-09-06 20:30:53 +00005550 if (RHSType->isBlockPointerType()) {
John McCalldc05b112011-09-10 01:16:55 +00005551 maybeExtendBlockObject(*this, RHS);
John McCall1d9b3b22011-09-09 05:25:32 +00005552 Kind = CK_BlockPointerToObjCPointerCast;
Steve Naroff14108da2009-07-10 23:34:53 +00005553 return Compatible;
John McCallb6cfa242011-01-31 22:28:28 +00005554 }
5555
Steve Naroff14108da2009-07-10 23:34:53 +00005556 return Incompatible;
5557 }
John McCallb6cfa242011-01-31 22:28:28 +00005558
5559 // Conversions from pointers that are not covered by the above.
Richard Trieufacef2e2011-09-06 20:30:53 +00005560 if (isa<PointerType>(RHSType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005561 // T* -> _Bool
Richard Trieufacef2e2011-09-06 20:30:53 +00005562 if (LHSType == Context.BoolTy) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005563 Kind = CK_PointerToBoolean;
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005564 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005565 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005566
John McCallb6cfa242011-01-31 22:28:28 +00005567 // T* -> int
Richard Trieufacef2e2011-09-06 20:30:53 +00005568 if (LHSType->isIntegerType()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005569 Kind = CK_PointerToIntegral;
Chris Lattnerb7b61152008-01-04 18:22:42 +00005570 return PointerToInt;
John McCalldaa8e4e2010-11-15 09:13:47 +00005571 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005572
Chris Lattnerfc144e22008-01-04 23:18:45 +00005573 return Incompatible;
Chris Lattnerfc144e22008-01-04 23:18:45 +00005574 }
John McCallb6cfa242011-01-31 22:28:28 +00005575
5576 // Conversions from Objective-C pointers that are not covered by the above.
Richard Trieufacef2e2011-09-06 20:30:53 +00005577 if (isa<ObjCObjectPointerType>(RHSType)) {
John McCallb6cfa242011-01-31 22:28:28 +00005578 // T* -> _Bool
Richard Trieufacef2e2011-09-06 20:30:53 +00005579 if (LHSType == Context.BoolTy) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005580 Kind = CK_PointerToBoolean;
Steve Naroff14108da2009-07-10 23:34:53 +00005581 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005582 }
Steve Naroff14108da2009-07-10 23:34:53 +00005583
John McCallb6cfa242011-01-31 22:28:28 +00005584 // T* -> int
Richard Trieufacef2e2011-09-06 20:30:53 +00005585 if (LHSType->isIntegerType()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005586 Kind = CK_PointerToIntegral;
Steve Naroff14108da2009-07-10 23:34:53 +00005587 return PointerToInt;
John McCalldaa8e4e2010-11-15 09:13:47 +00005588 }
5589
Steve Naroff14108da2009-07-10 23:34:53 +00005590 return Incompatible;
5591 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005592
John McCallb6cfa242011-01-31 22:28:28 +00005593 // struct A -> struct B
Richard Trieufacef2e2011-09-06 20:30:53 +00005594 if (isa<TagType>(LHSType) && isa<TagType>(RHSType)) {
5595 if (Context.typesAreCompatible(LHSType, RHSType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005596 Kind = CK_NoOp;
Reid Spencer5f016e22007-07-11 17:01:13 +00005597 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005598 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005599 }
John McCallb6cfa242011-01-31 22:28:28 +00005600
Reid Spencer5f016e22007-07-11 17:01:13 +00005601 return Incompatible;
5602}
5603
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005604/// \brief Constructs a transparent union from an expression that is
5605/// used to initialize the transparent union.
Richard Trieu67e29332011-08-02 04:35:43 +00005606static void ConstructTransparentUnion(Sema &S, ASTContext &C,
5607 ExprResult &EResult, QualType UnionType,
5608 FieldDecl *Field) {
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005609 // Build an initializer list that designates the appropriate member
5610 // of the transparent union.
John Wiegley429bb272011-04-08 18:41:53 +00005611 Expr *E = EResult.take();
Ted Kremenek709210f2010-04-13 23:39:13 +00005612 InitListExpr *Initializer = new (C) InitListExpr(C, SourceLocation(),
Ted Kremenekba7bc552010-02-19 01:50:18 +00005613 &E, 1,
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005614 SourceLocation());
5615 Initializer->setType(UnionType);
5616 Initializer->setInitializedFieldInUnion(Field);
5617
5618 // Build a compound literal constructing a value of the transparent
5619 // union type from this initializer list.
John McCall42f56b52010-01-18 19:35:47 +00005620 TypeSourceInfo *unionTInfo = C.getTrivialTypeSourceInfo(UnionType);
John Wiegley429bb272011-04-08 18:41:53 +00005621 EResult = S.Owned(
5622 new (C) CompoundLiteralExpr(SourceLocation(), unionTInfo, UnionType,
5623 VK_RValue, Initializer, false));
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005624}
5625
5626Sema::AssignConvertType
Richard Trieu67e29332011-08-02 04:35:43 +00005627Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType,
Richard Trieuf7720da2011-09-06 20:40:12 +00005628 ExprResult &RHS) {
5629 QualType RHSType = RHS.get()->getType();
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005630
Mike Stump1eb44332009-09-09 15:08:12 +00005631 // If the ArgType is a Union type, we want to handle a potential
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005632 // transparent_union GCC extension.
5633 const RecordType *UT = ArgType->getAsUnionType();
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00005634 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>())
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005635 return Incompatible;
5636
5637 // The field to initialize within the transparent union.
5638 RecordDecl *UD = UT->getDecl();
5639 FieldDecl *InitField = 0;
5640 // It's compatible if the expression matches any of the fields.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00005641 for (RecordDecl::field_iterator it = UD->field_begin(),
5642 itend = UD->field_end();
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005643 it != itend; ++it) {
5644 if (it->getType()->isPointerType()) {
5645 // If the transparent union contains a pointer type, we allow:
5646 // 1) void pointer
5647 // 2) null pointer constant
Richard Trieuf7720da2011-09-06 20:40:12 +00005648 if (RHSType->isPointerType())
John McCall1d9b3b22011-09-09 05:25:32 +00005649 if (RHSType->castAs<PointerType>()->getPointeeType()->isVoidType()) {
Richard Trieuf7720da2011-09-06 20:40:12 +00005650 RHS = ImpCastExprToType(RHS.take(), it->getType(), CK_BitCast);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005651 InitField = *it;
5652 break;
5653 }
Mike Stump1eb44332009-09-09 15:08:12 +00005654
Richard Trieuf7720da2011-09-06 20:40:12 +00005655 if (RHS.get()->isNullPointerConstant(Context,
5656 Expr::NPC_ValueDependentIsNull)) {
5657 RHS = ImpCastExprToType(RHS.take(), it->getType(),
5658 CK_NullToPointer);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005659 InitField = *it;
5660 break;
5661 }
5662 }
5663
John McCalldaa8e4e2010-11-15 09:13:47 +00005664 CastKind Kind = CK_Invalid;
Richard Trieuf7720da2011-09-06 20:40:12 +00005665 if (CheckAssignmentConstraints(it->getType(), RHS, Kind)
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005666 == Compatible) {
Richard Trieuf7720da2011-09-06 20:40:12 +00005667 RHS = ImpCastExprToType(RHS.take(), it->getType(), Kind);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005668 InitField = *it;
5669 break;
5670 }
5671 }
5672
5673 if (!InitField)
5674 return Incompatible;
5675
Richard Trieuf7720da2011-09-06 20:40:12 +00005676 ConstructTransparentUnion(*this, Context, RHS, ArgType, InitField);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005677 return Compatible;
5678}
5679
Chris Lattner5cf216b2008-01-04 18:04:52 +00005680Sema::AssignConvertType
Sebastian Redl14b0c192011-09-24 17:48:00 +00005681Sema::CheckSingleAssignmentConstraints(QualType LHSType, ExprResult &RHS,
5682 bool Diagnose) {
Douglas Gregor98cd5992008-10-21 23:43:52 +00005683 if (getLangOptions().CPlusPlus) {
Eli Friedmanb001de72011-10-06 23:00:33 +00005684 if (!LHSType->isRecordType() && !LHSType->isAtomicType()) {
Douglas Gregor98cd5992008-10-21 23:43:52 +00005685 // C++ 5.17p3: If the left operand is not of class type, the
5686 // expression is implicitly converted (C++ 4) to the
5687 // cv-unqualified type of the left operand.
Sebastian Redl091fffe2011-10-16 18:19:06 +00005688 ExprResult Res;
5689 if (Diagnose) {
5690 Res = PerformImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
5691 AA_Assigning);
5692 } else {
5693 ImplicitConversionSequence ICS =
5694 TryImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
5695 /*SuppressUserConversions=*/false,
5696 /*AllowExplicit=*/false,
5697 /*InOverloadResolution=*/false,
5698 /*CStyle=*/false,
5699 /*AllowObjCWritebackConversion=*/false);
5700 if (ICS.isFailure())
5701 return Incompatible;
5702 Res = PerformImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
5703 ICS, AA_Assigning);
5704 }
John Wiegley429bb272011-04-08 18:41:53 +00005705 if (Res.isInvalid())
Douglas Gregor98cd5992008-10-21 23:43:52 +00005706 return Incompatible;
Fariborz Jahanian7a084ec2011-07-07 23:04:17 +00005707 Sema::AssignConvertType result = Compatible;
5708 if (getLangOptions().ObjCAutoRefCount &&
Richard Trieuf7720da2011-09-06 20:40:12 +00005709 !CheckObjCARCUnavailableWeakConversion(LHSType,
5710 RHS.get()->getType()))
Fariborz Jahanian7a084ec2011-07-07 23:04:17 +00005711 result = IncompatibleObjCWeakRef;
Richard Trieuf7720da2011-09-06 20:40:12 +00005712 RHS = move(Res);
Fariborz Jahanian7a084ec2011-07-07 23:04:17 +00005713 return result;
Douglas Gregor98cd5992008-10-21 23:43:52 +00005714 }
5715
5716 // FIXME: Currently, we fall through and treat C++ classes like C
5717 // structures.
Eli Friedmanb001de72011-10-06 23:00:33 +00005718 // FIXME: We also fall through for atomics; not sure what should
5719 // happen there, though.
Sebastian Redl14b0c192011-09-24 17:48:00 +00005720 }
Douglas Gregor98cd5992008-10-21 23:43:52 +00005721
Steve Naroff529a4ad2007-11-27 17:58:44 +00005722 // C99 6.5.16.1p1: the left operand is a pointer and the right is
5723 // a null pointer constant.
Richard Trieuf7720da2011-09-06 20:40:12 +00005724 if ((LHSType->isPointerType() ||
5725 LHSType->isObjCObjectPointerType() ||
5726 LHSType->isBlockPointerType())
5727 && RHS.get()->isNullPointerConstant(Context,
5728 Expr::NPC_ValueDependentIsNull)) {
5729 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_NullToPointer);
Steve Naroff529a4ad2007-11-27 17:58:44 +00005730 return Compatible;
5731 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005732
Chris Lattner943140e2007-10-16 02:55:40 +00005733 // This check seems unnatural, however it is necessary to ensure the proper
Steve Naroff90045e82007-07-13 23:32:42 +00005734 // conversion of functions/arrays. If the conversion were done for all
Douglas Gregor02a24ee2009-11-03 16:56:39 +00005735 // DeclExpr's (created by ActOnIdExpression), it would mess up the unary
Nick Lewyckyc133e9e2010-08-05 06:27:49 +00005736 // expressions that suppress this implicit conversion (&, sizeof).
Chris Lattner943140e2007-10-16 02:55:40 +00005737 //
Mike Stumpeed9cac2009-02-19 03:04:26 +00005738 // Suppress this for references: C++ 8.5.3p5.
Richard Trieuf7720da2011-09-06 20:40:12 +00005739 if (!LHSType->isReferenceType()) {
5740 RHS = DefaultFunctionArrayLvalueConversion(RHS.take());
5741 if (RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00005742 return Incompatible;
5743 }
Steve Narofff1120de2007-08-24 22:33:52 +00005744
John McCalldaa8e4e2010-11-15 09:13:47 +00005745 CastKind Kind = CK_Invalid;
Chris Lattner5cf216b2008-01-04 18:04:52 +00005746 Sema::AssignConvertType result =
Richard Trieuf7720da2011-09-06 20:40:12 +00005747 CheckAssignmentConstraints(LHSType, RHS, Kind);
Mike Stumpeed9cac2009-02-19 03:04:26 +00005748
Steve Narofff1120de2007-08-24 22:33:52 +00005749 // C99 6.5.16.1p2: The value of the right operand is converted to the
5750 // type of the assignment expression.
Douglas Gregor9d293df2008-10-28 00:22:11 +00005751 // CheckAssignmentConstraints allows the left-hand side to be a reference,
5752 // so that we can use references in built-in functions even in C.
5753 // The getNonReferenceType() call makes sure that the resulting expression
5754 // does not have reference type.
Richard Trieuf7720da2011-09-06 20:40:12 +00005755 if (result != Incompatible && RHS.get()->getType() != LHSType)
5756 RHS = ImpCastExprToType(RHS.take(),
5757 LHSType.getNonLValueExprType(Context), Kind);
Steve Narofff1120de2007-08-24 22:33:52 +00005758 return result;
Steve Naroff90045e82007-07-13 23:32:42 +00005759}
5760
Richard Trieuf7720da2011-09-06 20:40:12 +00005761QualType Sema::InvalidOperands(SourceLocation Loc, ExprResult &LHS,
5762 ExprResult &RHS) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00005763 Diag(Loc, diag::err_typecheck_invalid_operands)
Richard Trieuf7720da2011-09-06 20:40:12 +00005764 << LHS.get()->getType() << RHS.get()->getType()
5765 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Chris Lattnerca5eede2007-12-12 05:47:28 +00005766 return QualType();
Reid Spencer5f016e22007-07-11 17:01:13 +00005767}
5768
Richard Trieu08062aa2011-09-06 21:01:04 +00005769QualType Sema::CheckVectorOperands(ExprResult &LHS, ExprResult &RHS,
Richard Trieuccd891a2011-09-09 01:45:06 +00005770 SourceLocation Loc, bool IsCompAssign) {
Richard Smith9c129f82011-10-28 03:31:48 +00005771 if (!IsCompAssign) {
5772 LHS = DefaultFunctionArrayLvalueConversion(LHS.take());
5773 if (LHS.isInvalid())
5774 return QualType();
5775 }
5776 RHS = DefaultFunctionArrayLvalueConversion(RHS.take());
5777 if (RHS.isInvalid())
5778 return QualType();
5779
Mike Stumpeed9cac2009-02-19 03:04:26 +00005780 // For conversion purposes, we ignore any qualifiers.
Nate Begeman1330b0e2008-04-04 01:30:25 +00005781 // For example, "const float" and "float" are equivalent.
Richard Trieu08062aa2011-09-06 21:01:04 +00005782 QualType LHSType =
5783 Context.getCanonicalType(LHS.get()->getType()).getUnqualifiedType();
5784 QualType RHSType =
5785 Context.getCanonicalType(RHS.get()->getType()).getUnqualifiedType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005786
Nate Begemanbe2341d2008-07-14 18:02:46 +00005787 // If the vector types are identical, return.
Richard Trieu08062aa2011-09-06 21:01:04 +00005788 if (LHSType == RHSType)
5789 return LHSType;
Nate Begeman4119d1a2007-12-30 02:59:45 +00005790
Douglas Gregor255210e2010-08-06 10:14:59 +00005791 // Handle the case of equivalent AltiVec and GCC vector types
Richard Trieu08062aa2011-09-06 21:01:04 +00005792 if (LHSType->isVectorType() && RHSType->isVectorType() &&
5793 Context.areCompatibleVectorTypes(LHSType, RHSType)) {
5794 if (LHSType->isExtVectorType()) {
5795 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
5796 return LHSType;
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005797 }
5798
Richard Trieuccd891a2011-09-09 01:45:06 +00005799 if (!IsCompAssign)
Richard Trieu08062aa2011-09-06 21:01:04 +00005800 LHS = ImpCastExprToType(LHS.take(), RHSType, CK_BitCast);
5801 return RHSType;
Douglas Gregor255210e2010-08-06 10:14:59 +00005802 }
5803
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005804 if (getLangOptions().LaxVectorConversions &&
Richard Trieu08062aa2011-09-06 21:01:04 +00005805 Context.getTypeSize(LHSType) == Context.getTypeSize(RHSType)) {
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005806 // If we are allowing lax vector conversions, and LHS and RHS are both
5807 // vectors, the total size only needs to be the same. This is a
5808 // bitcast; no bits are changed but the result type is different.
5809 // FIXME: Should we really be allowing this?
Richard Trieu08062aa2011-09-06 21:01:04 +00005810 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
5811 return LHSType;
Eli Friedmanb9b4b782011-06-23 18:10:35 +00005812 }
5813
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005814 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can
5815 // swap back (so that we don't reverse the inputs to a subtract, for instance.
5816 bool swapped = false;
Richard Trieuccd891a2011-09-09 01:45:06 +00005817 if (RHSType->isExtVectorType() && !IsCompAssign) {
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005818 swapped = true;
Richard Trieu08062aa2011-09-06 21:01:04 +00005819 std::swap(RHS, LHS);
5820 std::swap(RHSType, LHSType);
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005821 }
Mike Stump1eb44332009-09-09 15:08:12 +00005822
Nate Begemandde25982009-06-28 19:12:57 +00005823 // Handle the case of an ext vector and scalar.
Richard Trieu08062aa2011-09-06 21:01:04 +00005824 if (const ExtVectorType *LV = LHSType->getAs<ExtVectorType>()) {
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005825 QualType EltTy = LV->getElementType();
Richard Trieu08062aa2011-09-06 21:01:04 +00005826 if (EltTy->isIntegralType(Context) && RHSType->isIntegralType(Context)) {
5827 int order = Context.getIntegerTypeOrder(EltTy, RHSType);
John McCalldaa8e4e2010-11-15 09:13:47 +00005828 if (order > 0)
Richard Trieu08062aa2011-09-06 21:01:04 +00005829 RHS = ImpCastExprToType(RHS.take(), EltTy, CK_IntegralCast);
John McCalldaa8e4e2010-11-15 09:13:47 +00005830 if (order >= 0) {
Richard Trieu08062aa2011-09-06 21:01:04 +00005831 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_VectorSplat);
5832 if (swapped) std::swap(RHS, LHS);
5833 return LHSType;
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005834 }
5835 }
Richard Trieu08062aa2011-09-06 21:01:04 +00005836 if (EltTy->isRealFloatingType() && RHSType->isScalarType() &&
5837 RHSType->isRealFloatingType()) {
5838 int order = Context.getFloatingTypeOrder(EltTy, RHSType);
John McCalldaa8e4e2010-11-15 09:13:47 +00005839 if (order > 0)
Richard Trieu08062aa2011-09-06 21:01:04 +00005840 RHS = ImpCastExprToType(RHS.take(), EltTy, CK_FloatingCast);
John McCalldaa8e4e2010-11-15 09:13:47 +00005841 if (order >= 0) {
Richard Trieu08062aa2011-09-06 21:01:04 +00005842 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_VectorSplat);
5843 if (swapped) std::swap(RHS, LHS);
5844 return LHSType;
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005845 }
Nate Begeman4119d1a2007-12-30 02:59:45 +00005846 }
5847 }
Mike Stump1eb44332009-09-09 15:08:12 +00005848
Nate Begemandde25982009-06-28 19:12:57 +00005849 // Vectors of different size or scalar and non-ext-vector are errors.
Richard Trieu08062aa2011-09-06 21:01:04 +00005850 if (swapped) std::swap(RHS, LHS);
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00005851 Diag(Loc, diag::err_typecheck_vector_not_convertable)
Richard Trieu08062aa2011-09-06 21:01:04 +00005852 << LHS.get()->getType() << RHS.get()->getType()
5853 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00005854 return QualType();
Sebastian Redl22460502009-02-07 00:15:38 +00005855}
5856
Richard Trieu481037f2011-09-16 00:53:10 +00005857// checkArithmeticNull - Detect when a NULL constant is used improperly in an
5858// expression. These are mainly cases where the null pointer is used as an
5859// integer instead of a pointer.
5860static void checkArithmeticNull(Sema &S, ExprResult &LHS, ExprResult &RHS,
5861 SourceLocation Loc, bool IsCompare) {
5862 // The canonical way to check for a GNU null is with isNullPointerConstant,
5863 // but we use a bit of a hack here for speed; this is a relatively
5864 // hot path, and isNullPointerConstant is slow.
5865 bool LHSNull = isa<GNUNullExpr>(LHS.get()->IgnoreParenImpCasts());
5866 bool RHSNull = isa<GNUNullExpr>(RHS.get()->IgnoreParenImpCasts());
5867
5868 QualType NonNullType = LHSNull ? RHS.get()->getType() : LHS.get()->getType();
5869
5870 // Avoid analyzing cases where the result will either be invalid (and
5871 // diagnosed as such) or entirely valid and not something to warn about.
5872 if ((!LHSNull && !RHSNull) || NonNullType->isBlockPointerType() ||
5873 NonNullType->isMemberPointerType() || NonNullType->isFunctionType())
5874 return;
5875
5876 // Comparison operations would not make sense with a null pointer no matter
5877 // what the other expression is.
5878 if (!IsCompare) {
5879 S.Diag(Loc, diag::warn_null_in_arithmetic_operation)
5880 << (LHSNull ? LHS.get()->getSourceRange() : SourceRange())
5881 << (RHSNull ? RHS.get()->getSourceRange() : SourceRange());
5882 return;
5883 }
5884
5885 // The rest of the operations only make sense with a null pointer
5886 // if the other expression is a pointer.
5887 if (LHSNull == RHSNull || NonNullType->isAnyPointerType() ||
5888 NonNullType->canDecayToPointerType())
5889 return;
5890
5891 S.Diag(Loc, diag::warn_null_in_comparison_operation)
5892 << LHSNull /* LHS is NULL */ << NonNullType
5893 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
5894}
5895
Richard Trieu08062aa2011-09-06 21:01:04 +00005896QualType Sema::CheckMultiplyDivideOperands(ExprResult &LHS, ExprResult &RHS,
Richard Trieu67e29332011-08-02 04:35:43 +00005897 SourceLocation Loc,
Richard Trieuccd891a2011-09-09 01:45:06 +00005898 bool IsCompAssign, bool IsDiv) {
Richard Trieu481037f2011-09-16 00:53:10 +00005899 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
5900
Richard Trieu08062aa2011-09-06 21:01:04 +00005901 if (LHS.get()->getType()->isVectorType() ||
5902 RHS.get()->getType()->isVectorType())
Richard Trieuccd891a2011-09-09 01:45:06 +00005903 return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign);
Mike Stumpeed9cac2009-02-19 03:04:26 +00005904
Richard Trieuccd891a2011-09-09 01:45:06 +00005905 QualType compType = UsualArithmeticConversions(LHS, RHS, IsCompAssign);
Richard Trieu08062aa2011-09-06 21:01:04 +00005906 if (LHS.isInvalid() || RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00005907 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005908
Richard Trieu08062aa2011-09-06 21:01:04 +00005909 if (!LHS.get()->getType()->isArithmeticType() ||
5910 !RHS.get()->getType()->isArithmeticType())
5911 return InvalidOperands(Loc, LHS, RHS);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005912
Chris Lattner7ef655a2010-01-12 21:23:57 +00005913 // Check for division by zero.
Richard Trieuccd891a2011-09-09 01:45:06 +00005914 if (IsDiv &&
Richard Trieu08062aa2011-09-06 21:01:04 +00005915 RHS.get()->isNullPointerConstant(Context,
Richard Trieu67e29332011-08-02 04:35:43 +00005916 Expr::NPC_ValueDependentIsNotNull))
Richard Trieu08062aa2011-09-06 21:01:04 +00005917 DiagRuntimeBehavior(Loc, RHS.get(), PDiag(diag::warn_division_by_zero)
5918 << RHS.get()->getSourceRange());
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005919
Chris Lattner7ef655a2010-01-12 21:23:57 +00005920 return compType;
Reid Spencer5f016e22007-07-11 17:01:13 +00005921}
5922
Chris Lattner7ef655a2010-01-12 21:23:57 +00005923QualType Sema::CheckRemainderOperands(
Richard Trieuccd891a2011-09-09 01:45:06 +00005924 ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign) {
Richard Trieu481037f2011-09-16 00:53:10 +00005925 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
5926
Richard Trieu08062aa2011-09-06 21:01:04 +00005927 if (LHS.get()->getType()->isVectorType() ||
5928 RHS.get()->getType()->isVectorType()) {
5929 if (LHS.get()->getType()->hasIntegerRepresentation() &&
5930 RHS.get()->getType()->hasIntegerRepresentation())
Richard Trieuccd891a2011-09-09 01:45:06 +00005931 return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign);
Richard Trieu08062aa2011-09-06 21:01:04 +00005932 return InvalidOperands(Loc, LHS, RHS);
Daniel Dunbar523aa602009-01-05 22:55:36 +00005933 }
Steve Naroff90045e82007-07-13 23:32:42 +00005934
Richard Trieuccd891a2011-09-09 01:45:06 +00005935 QualType compType = UsualArithmeticConversions(LHS, RHS, IsCompAssign);
Richard Trieu08062aa2011-09-06 21:01:04 +00005936 if (LHS.isInvalid() || RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00005937 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005938
Richard Trieu08062aa2011-09-06 21:01:04 +00005939 if (!LHS.get()->getType()->isIntegerType() ||
5940 !RHS.get()->getType()->isIntegerType())
5941 return InvalidOperands(Loc, LHS, RHS);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005942
Chris Lattner7ef655a2010-01-12 21:23:57 +00005943 // Check for remainder by zero.
Richard Trieu08062aa2011-09-06 21:01:04 +00005944 if (RHS.get()->isNullPointerConstant(Context,
Richard Trieu67e29332011-08-02 04:35:43 +00005945 Expr::NPC_ValueDependentIsNotNull))
Richard Trieu08062aa2011-09-06 21:01:04 +00005946 DiagRuntimeBehavior(Loc, RHS.get(), PDiag(diag::warn_remainder_by_zero)
5947 << RHS.get()->getSourceRange());
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005948
Chris Lattner7ef655a2010-01-12 21:23:57 +00005949 return compType;
Reid Spencer5f016e22007-07-11 17:01:13 +00005950}
5951
Chandler Carruth13b21be2011-06-27 08:02:19 +00005952/// \brief Diagnose invalid arithmetic on two void pointers.
5953static void diagnoseArithmeticOnTwoVoidPointers(Sema &S, SourceLocation Loc,
Richard Trieudef75842011-09-06 21:13:51 +00005954 Expr *LHSExpr, Expr *RHSExpr) {
Chandler Carruth13b21be2011-06-27 08:02:19 +00005955 S.Diag(Loc, S.getLangOptions().CPlusPlus
5956 ? diag::err_typecheck_pointer_arith_void_type
5957 : diag::ext_gnu_void_ptr)
Richard Trieudef75842011-09-06 21:13:51 +00005958 << 1 /* two pointers */ << LHSExpr->getSourceRange()
5959 << RHSExpr->getSourceRange();
Chandler Carruth13b21be2011-06-27 08:02:19 +00005960}
5961
5962/// \brief Diagnose invalid arithmetic on a void pointer.
5963static void diagnoseArithmeticOnVoidPointer(Sema &S, SourceLocation Loc,
5964 Expr *Pointer) {
5965 S.Diag(Loc, S.getLangOptions().CPlusPlus
5966 ? diag::err_typecheck_pointer_arith_void_type
5967 : diag::ext_gnu_void_ptr)
5968 << 0 /* one pointer */ << Pointer->getSourceRange();
5969}
5970
5971/// \brief Diagnose invalid arithmetic on two function pointers.
5972static void diagnoseArithmeticOnTwoFunctionPointers(Sema &S, SourceLocation Loc,
5973 Expr *LHS, Expr *RHS) {
5974 assert(LHS->getType()->isAnyPointerType());
5975 assert(RHS->getType()->isAnyPointerType());
5976 S.Diag(Loc, S.getLangOptions().CPlusPlus
5977 ? diag::err_typecheck_pointer_arith_function_type
5978 : diag::ext_gnu_ptr_func_arith)
5979 << 1 /* two pointers */ << LHS->getType()->getPointeeType()
5980 // We only show the second type if it differs from the first.
5981 << (unsigned)!S.Context.hasSameUnqualifiedType(LHS->getType(),
5982 RHS->getType())
5983 << RHS->getType()->getPointeeType()
5984 << LHS->getSourceRange() << RHS->getSourceRange();
5985}
5986
5987/// \brief Diagnose invalid arithmetic on a function pointer.
5988static void diagnoseArithmeticOnFunctionPointer(Sema &S, SourceLocation Loc,
5989 Expr *Pointer) {
5990 assert(Pointer->getType()->isAnyPointerType());
5991 S.Diag(Loc, S.getLangOptions().CPlusPlus
5992 ? diag::err_typecheck_pointer_arith_function_type
5993 : diag::ext_gnu_ptr_func_arith)
5994 << 0 /* one pointer */ << Pointer->getType()->getPointeeType()
5995 << 0 /* one pointer, so only one type */
5996 << Pointer->getSourceRange();
5997}
5998
Richard Trieud9f19342011-09-12 18:08:02 +00005999/// \brief Emit error if Operand is incomplete pointer type
Richard Trieu097ecd22011-09-02 02:15:37 +00006000///
6001/// \returns True if pointer has incomplete type
6002static bool checkArithmeticIncompletePointerType(Sema &S, SourceLocation Loc,
6003 Expr *Operand) {
6004 if ((Operand->getType()->isPointerType() &&
6005 !Operand->getType()->isDependentType()) ||
6006 Operand->getType()->isObjCObjectPointerType()) {
6007 QualType PointeeTy = Operand->getType()->getPointeeType();
6008 if (S.RequireCompleteType(
6009 Loc, PointeeTy,
6010 S.PDiag(diag::err_typecheck_arithmetic_incomplete_type)
6011 << PointeeTy << Operand->getSourceRange()))
6012 return true;
6013 }
6014 return false;
6015}
6016
Chandler Carruth13b21be2011-06-27 08:02:19 +00006017/// \brief Check the validity of an arithmetic pointer operand.
6018///
6019/// If the operand has pointer type, this code will check for pointer types
6020/// which are invalid in arithmetic operations. These will be diagnosed
6021/// appropriately, including whether or not the use is supported as an
6022/// extension.
6023///
6024/// \returns True when the operand is valid to use (even if as an extension).
6025static bool checkArithmeticOpPointerOperand(Sema &S, SourceLocation Loc,
6026 Expr *Operand) {
6027 if (!Operand->getType()->isAnyPointerType()) return true;
6028
6029 QualType PointeeTy = Operand->getType()->getPointeeType();
6030 if (PointeeTy->isVoidType()) {
6031 diagnoseArithmeticOnVoidPointer(S, Loc, Operand);
6032 return !S.getLangOptions().CPlusPlus;
6033 }
6034 if (PointeeTy->isFunctionType()) {
6035 diagnoseArithmeticOnFunctionPointer(S, Loc, Operand);
6036 return !S.getLangOptions().CPlusPlus;
6037 }
6038
Richard Trieu097ecd22011-09-02 02:15:37 +00006039 if (checkArithmeticIncompletePointerType(S, Loc, Operand)) return false;
Chandler Carruth13b21be2011-06-27 08:02:19 +00006040
6041 return true;
6042}
6043
6044/// \brief Check the validity of a binary arithmetic operation w.r.t. pointer
6045/// operands.
6046///
6047/// This routine will diagnose any invalid arithmetic on pointer operands much
6048/// like \see checkArithmeticOpPointerOperand. However, it has special logic
6049/// for emitting a single diagnostic even for operations where both LHS and RHS
6050/// are (potentially problematic) pointers.
6051///
6052/// \returns True when the operand is valid to use (even if as an extension).
6053static bool checkArithmeticBinOpPointerOperands(Sema &S, SourceLocation Loc,
Richard Trieudef75842011-09-06 21:13:51 +00006054 Expr *LHSExpr, Expr *RHSExpr) {
6055 bool isLHSPointer = LHSExpr->getType()->isAnyPointerType();
6056 bool isRHSPointer = RHSExpr->getType()->isAnyPointerType();
Chandler Carruth13b21be2011-06-27 08:02:19 +00006057 if (!isLHSPointer && !isRHSPointer) return true;
6058
6059 QualType LHSPointeeTy, RHSPointeeTy;
Richard Trieudef75842011-09-06 21:13:51 +00006060 if (isLHSPointer) LHSPointeeTy = LHSExpr->getType()->getPointeeType();
6061 if (isRHSPointer) RHSPointeeTy = RHSExpr->getType()->getPointeeType();
Chandler Carruth13b21be2011-06-27 08:02:19 +00006062
6063 // Check for arithmetic on pointers to incomplete types.
6064 bool isLHSVoidPtr = isLHSPointer && LHSPointeeTy->isVoidType();
6065 bool isRHSVoidPtr = isRHSPointer && RHSPointeeTy->isVoidType();
6066 if (isLHSVoidPtr || isRHSVoidPtr) {
Richard Trieudef75842011-09-06 21:13:51 +00006067 if (!isRHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, LHSExpr);
6068 else if (!isLHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, RHSExpr);
6069 else diagnoseArithmeticOnTwoVoidPointers(S, Loc, LHSExpr, RHSExpr);
Chandler Carruth13b21be2011-06-27 08:02:19 +00006070
6071 return !S.getLangOptions().CPlusPlus;
6072 }
6073
6074 bool isLHSFuncPtr = isLHSPointer && LHSPointeeTy->isFunctionType();
6075 bool isRHSFuncPtr = isRHSPointer && RHSPointeeTy->isFunctionType();
6076 if (isLHSFuncPtr || isRHSFuncPtr) {
Richard Trieudef75842011-09-06 21:13:51 +00006077 if (!isRHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc, LHSExpr);
6078 else if (!isLHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc,
6079 RHSExpr);
6080 else diagnoseArithmeticOnTwoFunctionPointers(S, Loc, LHSExpr, RHSExpr);
Chandler Carruth13b21be2011-06-27 08:02:19 +00006081
6082 return !S.getLangOptions().CPlusPlus;
6083 }
6084
Richard Trieudef75842011-09-06 21:13:51 +00006085 if (checkArithmeticIncompletePointerType(S, Loc, LHSExpr)) return false;
6086 if (checkArithmeticIncompletePointerType(S, Loc, RHSExpr)) return false;
Richard Trieu097ecd22011-09-02 02:15:37 +00006087
Chandler Carruth13b21be2011-06-27 08:02:19 +00006088 return true;
6089}
6090
Richard Trieudb44a6b2011-09-01 22:53:23 +00006091/// \brief Check bad cases where we step over interface counts.
6092static bool checkArithmethicPointerOnNonFragileABI(Sema &S,
6093 SourceLocation OpLoc,
6094 Expr *Op) {
6095 assert(Op->getType()->isAnyPointerType());
6096 QualType PointeeTy = Op->getType()->getPointeeType();
6097 if (!PointeeTy->isObjCObjectType() || !S.LangOpts.ObjCNonFragileABI)
6098 return true;
6099
6100 S.Diag(OpLoc, diag::err_arithmetic_nonfragile_interface)
6101 << PointeeTy << Op->getSourceRange();
6102 return false;
6103}
6104
Richard Trieud9f19342011-09-12 18:08:02 +00006105/// \brief Emit error when two pointers are incompatible.
Richard Trieudb44a6b2011-09-01 22:53:23 +00006106static void diagnosePointerIncompatibility(Sema &S, SourceLocation Loc,
Richard Trieudef75842011-09-06 21:13:51 +00006107 Expr *LHSExpr, Expr *RHSExpr) {
6108 assert(LHSExpr->getType()->isAnyPointerType());
6109 assert(RHSExpr->getType()->isAnyPointerType());
Richard Trieudb44a6b2011-09-01 22:53:23 +00006110 S.Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
Richard Trieudef75842011-09-06 21:13:51 +00006111 << LHSExpr->getType() << RHSExpr->getType() << LHSExpr->getSourceRange()
6112 << RHSExpr->getSourceRange();
Richard Trieudb44a6b2011-09-01 22:53:23 +00006113}
6114
Chris Lattner7ef655a2010-01-12 21:23:57 +00006115QualType Sema::CheckAdditionOperands( // C99 6.5.6
Richard Trieudef75842011-09-06 21:13:51 +00006116 ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, QualType* CompLHSTy) {
Richard Trieu481037f2011-09-16 00:53:10 +00006117 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
6118
Richard Trieudef75842011-09-06 21:13:51 +00006119 if (LHS.get()->getType()->isVectorType() ||
6120 RHS.get()->getType()->isVectorType()) {
6121 QualType compType = CheckVectorOperands(LHS, RHS, Loc, CompLHSTy);
Eli Friedmanab3a8522009-03-28 01:22:36 +00006122 if (CompLHSTy) *CompLHSTy = compType;
6123 return compType;
6124 }
Steve Naroff49b45262007-07-13 16:58:59 +00006125
Richard Trieudef75842011-09-06 21:13:51 +00006126 QualType compType = UsualArithmeticConversions(LHS, RHS, CompLHSTy);
6127 if (LHS.isInvalid() || RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006128 return QualType();
Eli Friedmand72d16e2008-05-18 18:08:51 +00006129
Reid Spencer5f016e22007-07-11 17:01:13 +00006130 // handle the common case first (both operands are arithmetic).
Richard Trieudef75842011-09-06 21:13:51 +00006131 if (LHS.get()->getType()->isArithmeticType() &&
6132 RHS.get()->getType()->isArithmeticType()) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00006133 if (CompLHSTy) *CompLHSTy = compType;
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00006134 return compType;
Eli Friedmanab3a8522009-03-28 01:22:36 +00006135 }
Reid Spencer5f016e22007-07-11 17:01:13 +00006136
Eli Friedmand72d16e2008-05-18 18:08:51 +00006137 // Put any potential pointer into PExp
Richard Trieudef75842011-09-06 21:13:51 +00006138 Expr* PExp = LHS.get(), *IExp = RHS.get();
Steve Naroff58f9f2c2009-07-14 18:25:06 +00006139 if (IExp->getType()->isAnyPointerType())
Eli Friedmand72d16e2008-05-18 18:08:51 +00006140 std::swap(PExp, IExp);
6141
Richard Trieu6eef9fb2011-09-12 18:37:54 +00006142 if (!PExp->getType()->isAnyPointerType())
6143 return InvalidOperands(Loc, LHS, RHS);
Chandler Carruth13b21be2011-06-27 08:02:19 +00006144
Richard Trieu6eef9fb2011-09-12 18:37:54 +00006145 if (!IExp->getType()->isIntegerType())
6146 return InvalidOperands(Loc, LHS, RHS);
Mike Stump1eb44332009-09-09 15:08:12 +00006147
Richard Trieu6eef9fb2011-09-12 18:37:54 +00006148 if (!checkArithmeticOpPointerOperand(*this, Loc, PExp))
6149 return QualType();
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00006150
Richard Trieu6eef9fb2011-09-12 18:37:54 +00006151 // Diagnose bad cases where we step over interface counts.
6152 if (!checkArithmethicPointerOnNonFragileABI(*this, Loc, PExp))
6153 return QualType();
6154
6155 // Check array bounds for pointer arithemtic
6156 CheckArrayAccess(PExp, IExp);
6157
6158 if (CompLHSTy) {
6159 QualType LHSTy = Context.isPromotableBitField(LHS.get());
6160 if (LHSTy.isNull()) {
6161 LHSTy = LHS.get()->getType();
6162 if (LHSTy->isPromotableIntegerType())
6163 LHSTy = Context.getPromotedIntegerType(LHSTy);
Eli Friedmand72d16e2008-05-18 18:08:51 +00006164 }
Richard Trieu6eef9fb2011-09-12 18:37:54 +00006165 *CompLHSTy = LHSTy;
Eli Friedmand72d16e2008-05-18 18:08:51 +00006166 }
6167
Richard Trieu6eef9fb2011-09-12 18:37:54 +00006168 return PExp->getType();
Reid Spencer5f016e22007-07-11 17:01:13 +00006169}
6170
Chris Lattnereca7be62008-04-07 05:30:13 +00006171// C99 6.5.6
Richard Trieudef75842011-09-06 21:13:51 +00006172QualType Sema::CheckSubtractionOperands(ExprResult &LHS, ExprResult &RHS,
Richard Trieu67e29332011-08-02 04:35:43 +00006173 SourceLocation Loc,
6174 QualType* CompLHSTy) {
Richard Trieu481037f2011-09-16 00:53:10 +00006175 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
6176
Richard Trieudef75842011-09-06 21:13:51 +00006177 if (LHS.get()->getType()->isVectorType() ||
6178 RHS.get()->getType()->isVectorType()) {
6179 QualType compType = CheckVectorOperands(LHS, RHS, Loc, CompLHSTy);
Eli Friedmanab3a8522009-03-28 01:22:36 +00006180 if (CompLHSTy) *CompLHSTy = compType;
6181 return compType;
6182 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006183
Richard Trieudef75842011-09-06 21:13:51 +00006184 QualType compType = UsualArithmeticConversions(LHS, RHS, CompLHSTy);
6185 if (LHS.isInvalid() || RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006186 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006187
Chris Lattner6e4ab612007-12-09 21:53:25 +00006188 // Enforce type constraints: C99 6.5.6p3.
Mike Stumpeed9cac2009-02-19 03:04:26 +00006189
Chris Lattner6e4ab612007-12-09 21:53:25 +00006190 // Handle the common case first (both operands are arithmetic).
Richard Trieudef75842011-09-06 21:13:51 +00006191 if (LHS.get()->getType()->isArithmeticType() &&
6192 RHS.get()->getType()->isArithmeticType()) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00006193 if (CompLHSTy) *CompLHSTy = compType;
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00006194 return compType;
Eli Friedmanab3a8522009-03-28 01:22:36 +00006195 }
Mike Stump1eb44332009-09-09 15:08:12 +00006196
Chris Lattner6e4ab612007-12-09 21:53:25 +00006197 // Either ptr - int or ptr - ptr.
Richard Trieudef75842011-09-06 21:13:51 +00006198 if (LHS.get()->getType()->isAnyPointerType()) {
6199 QualType lpointee = LHS.get()->getType()->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006200
Chris Lattnerb5f15622009-04-24 23:50:08 +00006201 // Diagnose bad cases where we step over interface counts.
Richard Trieudef75842011-09-06 21:13:51 +00006202 if (!checkArithmethicPointerOnNonFragileABI(*this, Loc, LHS.get()))
Chris Lattnerb5f15622009-04-24 23:50:08 +00006203 return QualType();
Mike Stump1eb44332009-09-09 15:08:12 +00006204
Chris Lattner6e4ab612007-12-09 21:53:25 +00006205 // The result type of a pointer-int computation is the pointer type.
Richard Trieudef75842011-09-06 21:13:51 +00006206 if (RHS.get()->getType()->isIntegerType()) {
6207 if (!checkArithmeticOpPointerOperand(*this, Loc, LHS.get()))
Chandler Carruth13b21be2011-06-27 08:02:19 +00006208 return QualType();
Douglas Gregore7450f52009-03-24 19:52:54 +00006209
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00006210 // Check array bounds for pointer arithemtic
Richard Smith25b009a2011-12-16 19:31:14 +00006211 CheckArrayAccess(LHS.get(), RHS.get(), /*ArraySubscriptExpr*/0,
6212 /*AllowOnePastEnd*/true, /*IndexNegated*/true);
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00006213
Richard Trieudef75842011-09-06 21:13:51 +00006214 if (CompLHSTy) *CompLHSTy = LHS.get()->getType();
6215 return LHS.get()->getType();
Douglas Gregore7450f52009-03-24 19:52:54 +00006216 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006217
Chris Lattner6e4ab612007-12-09 21:53:25 +00006218 // Handle pointer-pointer subtractions.
Richard Trieu67e29332011-08-02 04:35:43 +00006219 if (const PointerType *RHSPTy
Richard Trieudef75842011-09-06 21:13:51 +00006220 = RHS.get()->getType()->getAs<PointerType>()) {
Eli Friedman8e54ad02008-02-08 01:19:44 +00006221 QualType rpointee = RHSPTy->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006222
Eli Friedman88d936b2009-05-16 13:54:38 +00006223 if (getLangOptions().CPlusPlus) {
6224 // Pointee types must be the same: C++ [expr.add]
6225 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) {
Richard Trieudef75842011-09-06 21:13:51 +00006226 diagnosePointerIncompatibility(*this, Loc, LHS.get(), RHS.get());
Eli Friedman88d936b2009-05-16 13:54:38 +00006227 }
6228 } else {
6229 // Pointee types must be compatible C99 6.5.6p3
6230 if (!Context.typesAreCompatible(
6231 Context.getCanonicalType(lpointee).getUnqualifiedType(),
6232 Context.getCanonicalType(rpointee).getUnqualifiedType())) {
Richard Trieudef75842011-09-06 21:13:51 +00006233 diagnosePointerIncompatibility(*this, Loc, LHS.get(), RHS.get());
Eli Friedman88d936b2009-05-16 13:54:38 +00006234 return QualType();
6235 }
Chris Lattner6e4ab612007-12-09 21:53:25 +00006236 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006237
Chandler Carruth13b21be2011-06-27 08:02:19 +00006238 if (!checkArithmeticBinOpPointerOperands(*this, Loc,
Richard Trieudef75842011-09-06 21:13:51 +00006239 LHS.get(), RHS.get()))
Chandler Carruth13b21be2011-06-27 08:02:19 +00006240 return QualType();
Eli Friedmanab3a8522009-03-28 01:22:36 +00006241
Richard Trieudef75842011-09-06 21:13:51 +00006242 if (CompLHSTy) *CompLHSTy = LHS.get()->getType();
Chris Lattner6e4ab612007-12-09 21:53:25 +00006243 return Context.getPointerDiffType();
6244 }
6245 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006246
Richard Trieudef75842011-09-06 21:13:51 +00006247 return InvalidOperands(Loc, LHS, RHS);
Reid Spencer5f016e22007-07-11 17:01:13 +00006248}
6249
Douglas Gregor1274ccd2010-10-08 23:50:27 +00006250static bool isScopedEnumerationType(QualType T) {
6251 if (const EnumType *ET = dyn_cast<EnumType>(T))
6252 return ET->getDecl()->isScoped();
6253 return false;
6254}
6255
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006256static void DiagnoseBadShiftValues(Sema& S, ExprResult &LHS, ExprResult &RHS,
Chandler Carruth21206d52011-02-23 23:34:11 +00006257 SourceLocation Loc, unsigned Opc,
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006258 QualType LHSType) {
Chandler Carruth21206d52011-02-23 23:34:11 +00006259 llvm::APSInt Right;
6260 // Check right/shifter operand
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006261 if (RHS.get()->isValueDependent() ||
6262 !RHS.get()->isIntegerConstantExpr(Right, S.Context))
Chandler Carruth21206d52011-02-23 23:34:11 +00006263 return;
6264
6265 if (Right.isNegative()) {
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006266 S.DiagRuntimeBehavior(Loc, RHS.get(),
Ted Kremenek082bf7a2011-03-01 18:09:31 +00006267 S.PDiag(diag::warn_shift_negative)
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006268 << RHS.get()->getSourceRange());
Chandler Carruth21206d52011-02-23 23:34:11 +00006269 return;
6270 }
6271 llvm::APInt LeftBits(Right.getBitWidth(),
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006272 S.Context.getTypeSize(LHS.get()->getType()));
Chandler Carruth21206d52011-02-23 23:34:11 +00006273 if (Right.uge(LeftBits)) {
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006274 S.DiagRuntimeBehavior(Loc, RHS.get(),
Ted Kremenek425a31e2011-03-01 19:13:22 +00006275 S.PDiag(diag::warn_shift_gt_typewidth)
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006276 << RHS.get()->getSourceRange());
Chandler Carruth21206d52011-02-23 23:34:11 +00006277 return;
6278 }
6279 if (Opc != BO_Shl)
6280 return;
6281
6282 // When left shifting an ICE which is signed, we can check for overflow which
6283 // according to C++ has undefined behavior ([expr.shift] 5.8/2). Unsigned
6284 // integers have defined behavior modulo one more than the maximum value
6285 // representable in the result type, so never warn for those.
6286 llvm::APSInt Left;
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006287 if (LHS.get()->isValueDependent() ||
6288 !LHS.get()->isIntegerConstantExpr(Left, S.Context) ||
6289 LHSType->hasUnsignedIntegerRepresentation())
Chandler Carruth21206d52011-02-23 23:34:11 +00006290 return;
6291 llvm::APInt ResultBits =
6292 static_cast<llvm::APInt&>(Right) + Left.getMinSignedBits();
6293 if (LeftBits.uge(ResultBits))
6294 return;
6295 llvm::APSInt Result = Left.extend(ResultBits.getLimitedValue());
6296 Result = Result.shl(Right);
6297
Ted Kremenekfa821382011-06-15 00:54:52 +00006298 // Print the bit representation of the signed integer as an unsigned
6299 // hexadecimal number.
6300 llvm::SmallString<40> HexResult;
6301 Result.toString(HexResult, 16, /*Signed =*/false, /*Literal =*/true);
6302
Chandler Carruth21206d52011-02-23 23:34:11 +00006303 // If we are only missing a sign bit, this is less likely to result in actual
6304 // bugs -- if the result is cast back to an unsigned type, it will have the
6305 // expected value. Thus we place this behind a different warning that can be
6306 // turned off separately if needed.
6307 if (LeftBits == ResultBits - 1) {
Ted Kremenekfa821382011-06-15 00:54:52 +00006308 S.Diag(Loc, diag::warn_shift_result_sets_sign_bit)
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006309 << HexResult.str() << LHSType
6310 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Chandler Carruth21206d52011-02-23 23:34:11 +00006311 return;
6312 }
6313
6314 S.Diag(Loc, diag::warn_shift_result_gt_typewidth)
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006315 << HexResult.str() << Result.getMinSignedBits() << LHSType
6316 << Left.getBitWidth() << LHS.get()->getSourceRange()
6317 << RHS.get()->getSourceRange();
Chandler Carruth21206d52011-02-23 23:34:11 +00006318}
6319
Chris Lattnereca7be62008-04-07 05:30:13 +00006320// C99 6.5.7
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006321QualType Sema::CheckShiftOperands(ExprResult &LHS, ExprResult &RHS,
Richard Trieu67e29332011-08-02 04:35:43 +00006322 SourceLocation Loc, unsigned Opc,
Richard Trieuccd891a2011-09-09 01:45:06 +00006323 bool IsCompAssign) {
Richard Trieu481037f2011-09-16 00:53:10 +00006324 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
6325
Chris Lattnerca5eede2007-12-12 05:47:28 +00006326 // C99 6.5.7p2: Each of the operands shall have integer type.
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006327 if (!LHS.get()->getType()->hasIntegerRepresentation() ||
6328 !RHS.get()->getType()->hasIntegerRepresentation())
6329 return InvalidOperands(Loc, LHS, RHS);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006330
Douglas Gregor1274ccd2010-10-08 23:50:27 +00006331 // C++0x: Don't allow scoped enums. FIXME: Use something better than
6332 // hasIntegerRepresentation() above instead of this.
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006333 if (isScopedEnumerationType(LHS.get()->getType()) ||
6334 isScopedEnumerationType(RHS.get()->getType())) {
6335 return InvalidOperands(Loc, LHS, RHS);
Douglas Gregor1274ccd2010-10-08 23:50:27 +00006336 }
6337
Nate Begeman2207d792009-10-25 02:26:48 +00006338 // Vector shifts promote their scalar inputs to vector type.
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006339 if (LHS.get()->getType()->isVectorType() ||
6340 RHS.get()->getType()->isVectorType())
Richard Trieuccd891a2011-09-09 01:45:06 +00006341 return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign);
Nate Begeman2207d792009-10-25 02:26:48 +00006342
Chris Lattnerca5eede2007-12-12 05:47:28 +00006343 // Shifts don't perform usual arithmetic conversions, they just do integer
6344 // promotions on each operand. C99 6.5.7p3
Eli Friedmanab3a8522009-03-28 01:22:36 +00006345
John McCall1bc80af2010-12-16 19:28:59 +00006346 // For the LHS, do usual unary conversions, but then reset them away
6347 // if this is a compound assignment.
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006348 ExprResult OldLHS = LHS;
6349 LHS = UsualUnaryConversions(LHS.take());
6350 if (LHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006351 return QualType();
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006352 QualType LHSType = LHS.get()->getType();
Richard Trieuccd891a2011-09-09 01:45:06 +00006353 if (IsCompAssign) LHS = OldLHS;
John McCall1bc80af2010-12-16 19:28:59 +00006354
6355 // The RHS is simpler.
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006356 RHS = UsualUnaryConversions(RHS.take());
6357 if (RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006358 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006359
Ryan Flynnd0439682009-08-07 16:20:20 +00006360 // Sanity-check shift operands
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006361 DiagnoseBadShiftValues(*this, LHS, RHS, Loc, Opc, LHSType);
Ryan Flynnd0439682009-08-07 16:20:20 +00006362
Chris Lattnerca5eede2007-12-12 05:47:28 +00006363 // "The type of the result is that of the promoted left operand."
Richard Trieu1c8cfbf2011-09-06 21:21:28 +00006364 return LHSType;
Reid Spencer5f016e22007-07-11 17:01:13 +00006365}
6366
Chandler Carruth99919472010-07-10 12:30:03 +00006367static bool IsWithinTemplateSpecialization(Decl *D) {
6368 if (DeclContext *DC = D->getDeclContext()) {
6369 if (isa<ClassTemplateSpecializationDecl>(DC))
6370 return true;
6371 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(DC))
6372 return FD->isFunctionTemplateSpecialization();
6373 }
6374 return false;
6375}
6376
Richard Trieue648ac32011-09-02 03:48:46 +00006377/// If two different enums are compared, raise a warning.
Richard Trieuba261492011-09-06 21:27:33 +00006378static void checkEnumComparison(Sema &S, SourceLocation Loc, ExprResult &LHS,
6379 ExprResult &RHS) {
6380 QualType LHSStrippedType = LHS.get()->IgnoreParenImpCasts()->getType();
6381 QualType RHSStrippedType = RHS.get()->IgnoreParenImpCasts()->getType();
Richard Trieue648ac32011-09-02 03:48:46 +00006382
6383 const EnumType *LHSEnumType = LHSStrippedType->getAs<EnumType>();
6384 if (!LHSEnumType)
6385 return;
6386 const EnumType *RHSEnumType = RHSStrippedType->getAs<EnumType>();
6387 if (!RHSEnumType)
6388 return;
6389
6390 // Ignore anonymous enums.
6391 if (!LHSEnumType->getDecl()->getIdentifier())
6392 return;
6393 if (!RHSEnumType->getDecl()->getIdentifier())
6394 return;
6395
6396 if (S.Context.hasSameUnqualifiedType(LHSStrippedType, RHSStrippedType))
6397 return;
6398
6399 S.Diag(Loc, diag::warn_comparison_of_mixed_enum_types)
6400 << LHSStrippedType << RHSStrippedType
Richard Trieuba261492011-09-06 21:27:33 +00006401 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Richard Trieue648ac32011-09-02 03:48:46 +00006402}
6403
Richard Trieu7be1be02011-09-02 02:55:45 +00006404/// \brief Diagnose bad pointer comparisons.
6405static void diagnoseDistinctPointerComparison(Sema &S, SourceLocation Loc,
Richard Trieuba261492011-09-06 21:27:33 +00006406 ExprResult &LHS, ExprResult &RHS,
Richard Trieuccd891a2011-09-09 01:45:06 +00006407 bool IsError) {
6408 S.Diag(Loc, IsError ? diag::err_typecheck_comparison_of_distinct_pointers
Richard Trieu7be1be02011-09-02 02:55:45 +00006409 : diag::ext_typecheck_comparison_of_distinct_pointers)
Richard Trieuba261492011-09-06 21:27:33 +00006410 << LHS.get()->getType() << RHS.get()->getType()
6411 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Richard Trieu7be1be02011-09-02 02:55:45 +00006412}
6413
6414/// \brief Returns false if the pointers are converted to a composite type,
6415/// true otherwise.
6416static bool convertPointersToCompositeType(Sema &S, SourceLocation Loc,
Richard Trieuba261492011-09-06 21:27:33 +00006417 ExprResult &LHS, ExprResult &RHS) {
Richard Trieu7be1be02011-09-02 02:55:45 +00006418 // C++ [expr.rel]p2:
6419 // [...] Pointer conversions (4.10) and qualification
6420 // conversions (4.4) are performed on pointer operands (or on
6421 // a pointer operand and a null pointer constant) to bring
6422 // them to their composite pointer type. [...]
6423 //
6424 // C++ [expr.eq]p1 uses the same notion for (in)equality
6425 // comparisons of pointers.
6426
6427 // C++ [expr.eq]p2:
6428 // In addition, pointers to members can be compared, or a pointer to
6429 // member and a null pointer constant. Pointer to member conversions
6430 // (4.11) and qualification conversions (4.4) are performed to bring
6431 // them to a common type. If one operand is a null pointer constant,
6432 // the common type is the type of the other operand. Otherwise, the
6433 // common type is a pointer to member type similar (4.4) to the type
6434 // of one of the operands, with a cv-qualification signature (4.4)
6435 // that is the union of the cv-qualification signatures of the operand
6436 // types.
6437
Richard Trieuba261492011-09-06 21:27:33 +00006438 QualType LHSType = LHS.get()->getType();
6439 QualType RHSType = RHS.get()->getType();
6440 assert((LHSType->isPointerType() && RHSType->isPointerType()) ||
6441 (LHSType->isMemberPointerType() && RHSType->isMemberPointerType()));
Richard Trieu7be1be02011-09-02 02:55:45 +00006442
6443 bool NonStandardCompositeType = false;
Richard Trieu43dff1b2011-09-02 21:44:27 +00006444 bool *BoolPtr = S.isSFINAEContext() ? 0 : &NonStandardCompositeType;
Richard Trieuba261492011-09-06 21:27:33 +00006445 QualType T = S.FindCompositePointerType(Loc, LHS, RHS, BoolPtr);
Richard Trieu7be1be02011-09-02 02:55:45 +00006446 if (T.isNull()) {
Richard Trieuba261492011-09-06 21:27:33 +00006447 diagnoseDistinctPointerComparison(S, Loc, LHS, RHS, /*isError*/true);
Richard Trieu7be1be02011-09-02 02:55:45 +00006448 return true;
6449 }
6450
6451 if (NonStandardCompositeType)
6452 S.Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers_nonstandard)
Richard Trieuba261492011-09-06 21:27:33 +00006453 << LHSType << RHSType << T << LHS.get()->getSourceRange()
6454 << RHS.get()->getSourceRange();
Richard Trieu7be1be02011-09-02 02:55:45 +00006455
Richard Trieuba261492011-09-06 21:27:33 +00006456 LHS = S.ImpCastExprToType(LHS.take(), T, CK_BitCast);
6457 RHS = S.ImpCastExprToType(RHS.take(), T, CK_BitCast);
Richard Trieu7be1be02011-09-02 02:55:45 +00006458 return false;
6459}
6460
6461static void diagnoseFunctionPointerToVoidComparison(Sema &S, SourceLocation Loc,
Richard Trieuba261492011-09-06 21:27:33 +00006462 ExprResult &LHS,
6463 ExprResult &RHS,
Richard Trieuccd891a2011-09-09 01:45:06 +00006464 bool IsError) {
6465 S.Diag(Loc, IsError ? diag::err_typecheck_comparison_of_fptr_to_void
6466 : diag::ext_typecheck_comparison_of_fptr_to_void)
Richard Trieuba261492011-09-06 21:27:33 +00006467 << LHS.get()->getType() << RHS.get()->getType()
6468 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
Richard Trieu7be1be02011-09-02 02:55:45 +00006469}
6470
Douglas Gregor0c6db942009-05-04 06:07:12 +00006471// C99 6.5.8, C++ [expr.rel]
Richard Trieuf1775fb2011-09-06 21:43:51 +00006472QualType Sema::CheckCompareOperands(ExprResult &LHS, ExprResult &RHS,
Richard Trieu67e29332011-08-02 04:35:43 +00006473 SourceLocation Loc, unsigned OpaqueOpc,
Richard Trieuccd891a2011-09-09 01:45:06 +00006474 bool IsRelational) {
Richard Trieu481037f2011-09-16 00:53:10 +00006475 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/true);
6476
John McCall2de56d12010-08-25 11:45:40 +00006477 BinaryOperatorKind Opc = (BinaryOperatorKind) OpaqueOpc;
Douglas Gregora86b8322009-04-06 18:45:53 +00006478
Chris Lattner02dd4b12009-12-05 05:40:13 +00006479 // Handle vector comparisons separately.
Richard Trieuf1775fb2011-09-06 21:43:51 +00006480 if (LHS.get()->getType()->isVectorType() ||
6481 RHS.get()->getType()->isVectorType())
Richard Trieuccd891a2011-09-09 01:45:06 +00006482 return CheckVectorCompareOperands(LHS, RHS, Loc, IsRelational);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006483
Richard Trieuf1775fb2011-09-06 21:43:51 +00006484 QualType LHSType = LHS.get()->getType();
6485 QualType RHSType = RHS.get()->getType();
Benjamin Kramerfec09592011-09-03 08:46:20 +00006486
Richard Trieuf1775fb2011-09-06 21:43:51 +00006487 Expr *LHSStripped = LHS.get()->IgnoreParenImpCasts();
6488 Expr *RHSStripped = RHS.get()->IgnoreParenImpCasts();
Chandler Carruth543cb652011-02-17 08:37:06 +00006489
Richard Trieuf1775fb2011-09-06 21:43:51 +00006490 checkEnumComparison(*this, Loc, LHS, RHS);
Chandler Carruth543cb652011-02-17 08:37:06 +00006491
Richard Trieuf1775fb2011-09-06 21:43:51 +00006492 if (!LHSType->hasFloatingRepresentation() &&
Richard Trieuccd891a2011-09-09 01:45:06 +00006493 !(LHSType->isBlockPointerType() && IsRelational) &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006494 !LHS.get()->getLocStart().isMacroID() &&
6495 !RHS.get()->getLocStart().isMacroID()) {
Chris Lattner55660a72009-03-08 19:39:53 +00006496 // For non-floating point types, check for self-comparisons of the form
6497 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
6498 // often indicate logic errors in the program.
Chandler Carruth64d092c2010-07-12 06:23:38 +00006499 //
6500 // NOTE: Don't warn about comparison expressions resulting from macro
6501 // expansion. Also don't warn about comparisons which are only self
6502 // comparisons within a template specialization. The warnings should catch
6503 // obvious cases in the definition of the template anyways. The idea is to
6504 // warn when the typed comparison operator will always evaluate to the same
6505 // result.
Chandler Carruth99919472010-07-10 12:30:03 +00006506 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) {
Douglas Gregord64fdd02010-06-08 19:50:34 +00006507 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) {
Ted Kremenekfbcb0eb2010-09-16 00:03:01 +00006508 if (DRL->getDecl() == DRR->getDecl() &&
Chandler Carruth99919472010-07-10 12:30:03 +00006509 !IsWithinTemplateSpecialization(DRL->getDecl())) {
Ted Kremenek351ba912011-02-23 01:52:04 +00006510 DiagRuntimeBehavior(Loc, 0, PDiag(diag::warn_comparison_always)
Douglas Gregord64fdd02010-06-08 19:50:34 +00006511 << 0 // self-
John McCall2de56d12010-08-25 11:45:40 +00006512 << (Opc == BO_EQ
6513 || Opc == BO_LE
6514 || Opc == BO_GE));
Richard Trieuf1775fb2011-09-06 21:43:51 +00006515 } else if (LHSType->isArrayType() && RHSType->isArrayType() &&
Douglas Gregord64fdd02010-06-08 19:50:34 +00006516 !DRL->getDecl()->getType()->isReferenceType() &&
6517 !DRR->getDecl()->getType()->isReferenceType()) {
6518 // what is it always going to eval to?
6519 char always_evals_to;
6520 switch(Opc) {
John McCall2de56d12010-08-25 11:45:40 +00006521 case BO_EQ: // e.g. array1 == array2
Douglas Gregord64fdd02010-06-08 19:50:34 +00006522 always_evals_to = 0; // false
6523 break;
John McCall2de56d12010-08-25 11:45:40 +00006524 case BO_NE: // e.g. array1 != array2
Douglas Gregord64fdd02010-06-08 19:50:34 +00006525 always_evals_to = 1; // true
6526 break;
6527 default:
6528 // best we can say is 'a constant'
6529 always_evals_to = 2; // e.g. array1 <= array2
6530 break;
6531 }
Ted Kremenek351ba912011-02-23 01:52:04 +00006532 DiagRuntimeBehavior(Loc, 0, PDiag(diag::warn_comparison_always)
Douglas Gregord64fdd02010-06-08 19:50:34 +00006533 << 1 // array
6534 << always_evals_to);
6535 }
6536 }
Chandler Carruth99919472010-07-10 12:30:03 +00006537 }
Mike Stump1eb44332009-09-09 15:08:12 +00006538
Chris Lattner55660a72009-03-08 19:39:53 +00006539 if (isa<CastExpr>(LHSStripped))
6540 LHSStripped = LHSStripped->IgnoreParenCasts();
6541 if (isa<CastExpr>(RHSStripped))
6542 RHSStripped = RHSStripped->IgnoreParenCasts();
Mike Stump1eb44332009-09-09 15:08:12 +00006543
Chris Lattner55660a72009-03-08 19:39:53 +00006544 // Warn about comparisons against a string constant (unless the other
6545 // operand is null), the user probably wants strcmp.
Douglas Gregora86b8322009-04-06 18:45:53 +00006546 Expr *literalString = 0;
6547 Expr *literalStringStripped = 0;
Chris Lattner55660a72009-03-08 19:39:53 +00006548 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) &&
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006549 !RHSStripped->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006550 Expr::NPC_ValueDependentIsNull)) {
Richard Trieuf1775fb2011-09-06 21:43:51 +00006551 literalString = LHS.get();
Douglas Gregora86b8322009-04-06 18:45:53 +00006552 literalStringStripped = LHSStripped;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00006553 } else if ((isa<StringLiteral>(RHSStripped) ||
6554 isa<ObjCEncodeExpr>(RHSStripped)) &&
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006555 !LHSStripped->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006556 Expr::NPC_ValueDependentIsNull)) {
Richard Trieuf1775fb2011-09-06 21:43:51 +00006557 literalString = RHS.get();
Douglas Gregora86b8322009-04-06 18:45:53 +00006558 literalStringStripped = RHSStripped;
6559 }
6560
6561 if (literalString) {
6562 std::string resultComparison;
6563 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00006564 case BO_LT: resultComparison = ") < 0"; break;
6565 case BO_GT: resultComparison = ") > 0"; break;
6566 case BO_LE: resultComparison = ") <= 0"; break;
6567 case BO_GE: resultComparison = ") >= 0"; break;
6568 case BO_EQ: resultComparison = ") == 0"; break;
6569 case BO_NE: resultComparison = ") != 0"; break;
David Blaikieb219cfc2011-09-23 05:06:16 +00006570 default: llvm_unreachable("Invalid comparison operator");
Douglas Gregora86b8322009-04-06 18:45:53 +00006571 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006572
Ted Kremenek351ba912011-02-23 01:52:04 +00006573 DiagRuntimeBehavior(Loc, 0,
Douglas Gregord1e4d9b2010-01-12 23:18:54 +00006574 PDiag(diag::warn_stringcompare)
6575 << isa<ObjCEncodeExpr>(literalStringStripped)
Ted Kremenek03a4bee2010-04-09 20:26:53 +00006576 << literalString->getSourceRange());
Douglas Gregora86b8322009-04-06 18:45:53 +00006577 }
Ted Kremenek3ca0bf22007-10-29 16:58:49 +00006578 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006579
Douglas Gregord64fdd02010-06-08 19:50:34 +00006580 // C99 6.5.8p3 / C99 6.5.9p4
Richard Trieuf1775fb2011-09-06 21:43:51 +00006581 if (LHS.get()->getType()->isArithmeticType() &&
6582 RHS.get()->getType()->isArithmeticType()) {
6583 UsualArithmeticConversions(LHS, RHS);
6584 if (LHS.isInvalid() || RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006585 return QualType();
6586 }
Douglas Gregord64fdd02010-06-08 19:50:34 +00006587 else {
Richard Trieuf1775fb2011-09-06 21:43:51 +00006588 LHS = UsualUnaryConversions(LHS.take());
6589 if (LHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006590 return QualType();
6591
Richard Trieuf1775fb2011-09-06 21:43:51 +00006592 RHS = UsualUnaryConversions(RHS.take());
6593 if (RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006594 return QualType();
Douglas Gregord64fdd02010-06-08 19:50:34 +00006595 }
6596
Richard Trieuf1775fb2011-09-06 21:43:51 +00006597 LHSType = LHS.get()->getType();
6598 RHSType = RHS.get()->getType();
Douglas Gregord64fdd02010-06-08 19:50:34 +00006599
Douglas Gregor447b69e2008-11-19 03:25:36 +00006600 // The result of comparisons is 'bool' in C++, 'int' in C.
Argyrios Kyrtzidis16f744b2011-02-18 20:55:15 +00006601 QualType ResultTy = Context.getLogicalOperationType();
Douglas Gregor447b69e2008-11-19 03:25:36 +00006602
Richard Trieuccd891a2011-09-09 01:45:06 +00006603 if (IsRelational) {
Richard Trieuf1775fb2011-09-06 21:43:51 +00006604 if (LHSType->isRealType() && RHSType->isRealType())
Douglas Gregor447b69e2008-11-19 03:25:36 +00006605 return ResultTy;
Chris Lattnera5937dd2007-08-26 01:18:55 +00006606 } else {
Ted Kremenek72cb1ae2007-10-29 17:13:39 +00006607 // Check for comparisons of floating point operands using != and ==.
Richard Trieuf1775fb2011-09-06 21:43:51 +00006608 if (LHSType->hasFloatingRepresentation())
6609 CheckFloatComparison(Loc, LHS.get(), RHS.get());
Mike Stumpeed9cac2009-02-19 03:04:26 +00006610
Richard Trieuf1775fb2011-09-06 21:43:51 +00006611 if (LHSType->isArithmeticType() && RHSType->isArithmeticType())
Douglas Gregor447b69e2008-11-19 03:25:36 +00006612 return ResultTy;
Chris Lattnera5937dd2007-08-26 01:18:55 +00006613 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006614
Richard Trieuf1775fb2011-09-06 21:43:51 +00006615 bool LHSIsNull = LHS.get()->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006616 Expr::NPC_ValueDependentIsNull);
Richard Trieuf1775fb2011-09-06 21:43:51 +00006617 bool RHSIsNull = RHS.get()->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006618 Expr::NPC_ValueDependentIsNull);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006619
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006620 // All of the following pointer-related warnings are GCC extensions, except
6621 // when handling null pointer constants.
Richard Trieuf1775fb2011-09-06 21:43:51 +00006622 if (LHSType->isPointerType() && RHSType->isPointerType()) { // C99 6.5.8p2
Chris Lattnerbc896f52008-04-03 05:07:25 +00006623 QualType LCanPointeeTy =
John McCall1d9b3b22011-09-09 05:25:32 +00006624 LHSType->castAs<PointerType>()->getPointeeType().getCanonicalType();
Chris Lattnerbc896f52008-04-03 05:07:25 +00006625 QualType RCanPointeeTy =
John McCall1d9b3b22011-09-09 05:25:32 +00006626 RHSType->castAs<PointerType>()->getPointeeType().getCanonicalType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006627
Douglas Gregor0c6db942009-05-04 06:07:12 +00006628 if (getLangOptions().CPlusPlus) {
Eli Friedman3075e762009-08-23 00:27:47 +00006629 if (LCanPointeeTy == RCanPointeeTy)
6630 return ResultTy;
Richard Trieuccd891a2011-09-09 01:45:06 +00006631 if (!IsRelational &&
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00006632 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
6633 // Valid unless comparison between non-null pointer and function pointer
6634 // This is a gcc extension compatibility comparison.
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006635 // In a SFINAE context, we treat this as a hard error to maintain
6636 // conformance with the C++ standard.
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00006637 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
6638 && !LHSIsNull && !RHSIsNull) {
Richard Trieu7be1be02011-09-02 02:55:45 +00006639 diagnoseFunctionPointerToVoidComparison(
Richard Trieuf1775fb2011-09-06 21:43:51 +00006640 *this, Loc, LHS, RHS, /*isError*/ isSFINAEContext());
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006641
6642 if (isSFINAEContext())
6643 return QualType();
6644
Richard Trieuf1775fb2011-09-06 21:43:51 +00006645 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00006646 return ResultTy;
6647 }
6648 }
Anders Carlsson0c8209e2010-11-04 03:17:43 +00006649
Richard Trieuf1775fb2011-09-06 21:43:51 +00006650 if (convertPointersToCompositeType(*this, Loc, LHS, RHS))
Douglas Gregor0c6db942009-05-04 06:07:12 +00006651 return QualType();
Richard Trieu7be1be02011-09-02 02:55:45 +00006652 else
6653 return ResultTy;
Douglas Gregor0c6db942009-05-04 06:07:12 +00006654 }
Eli Friedman3075e762009-08-23 00:27:47 +00006655 // C99 6.5.9p2 and C99 6.5.8p2
6656 if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(),
6657 RCanPointeeTy.getUnqualifiedType())) {
6658 // Valid unless a relational comparison of function pointers
Richard Trieuccd891a2011-09-09 01:45:06 +00006659 if (IsRelational && LCanPointeeTy->isFunctionType()) {
Eli Friedman3075e762009-08-23 00:27:47 +00006660 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers)
Richard Trieuf1775fb2011-09-06 21:43:51 +00006661 << LHSType << RHSType << LHS.get()->getSourceRange()
6662 << RHS.get()->getSourceRange();
Eli Friedman3075e762009-08-23 00:27:47 +00006663 }
Richard Trieuccd891a2011-09-09 01:45:06 +00006664 } else if (!IsRelational &&
Eli Friedman3075e762009-08-23 00:27:47 +00006665 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
6666 // Valid unless comparison between non-null pointer and function pointer
6667 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
Richard Trieu7be1be02011-09-02 02:55:45 +00006668 && !LHSIsNull && !RHSIsNull)
Richard Trieuf1775fb2011-09-06 21:43:51 +00006669 diagnoseFunctionPointerToVoidComparison(*this, Loc, LHS, RHS,
Richard Trieu7be1be02011-09-02 02:55:45 +00006670 /*isError*/false);
Eli Friedman3075e762009-08-23 00:27:47 +00006671 } else {
6672 // Invalid
Richard Trieuf1775fb2011-09-06 21:43:51 +00006673 diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS, /*isError*/false);
Reid Spencer5f016e22007-07-11 17:01:13 +00006674 }
John McCall34d6f932011-03-11 04:25:25 +00006675 if (LCanPointeeTy != RCanPointeeTy) {
6676 if (LHSIsNull && !RHSIsNull)
Richard Trieuf1775fb2011-09-06 21:43:51 +00006677 LHS = ImpCastExprToType(LHS.take(), RHSType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00006678 else
Richard Trieuf1775fb2011-09-06 21:43:51 +00006679 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00006680 }
Douglas Gregor447b69e2008-11-19 03:25:36 +00006681 return ResultTy;
Steve Naroffe77fd3c2007-08-16 21:48:38 +00006682 }
Mike Stump1eb44332009-09-09 15:08:12 +00006683
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006684 if (getLangOptions().CPlusPlus) {
Anders Carlsson0c8209e2010-11-04 03:17:43 +00006685 // Comparison of nullptr_t with itself.
Richard Trieuf1775fb2011-09-06 21:43:51 +00006686 if (LHSType->isNullPtrType() && RHSType->isNullPtrType())
Anders Carlsson0c8209e2010-11-04 03:17:43 +00006687 return ResultTy;
6688
Mike Stump1eb44332009-09-09 15:08:12 +00006689 // Comparison of pointers with null pointer constants and equality
Douglas Gregor20b3e992009-08-24 17:42:35 +00006690 // comparisons of member pointers to null pointer constants.
Mike Stump1eb44332009-09-09 15:08:12 +00006691 if (RHSIsNull &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006692 ((LHSType->isAnyPointerType() || LHSType->isNullPtrType()) ||
Richard Trieuccd891a2011-09-09 01:45:06 +00006693 (!IsRelational &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006694 (LHSType->isMemberPointerType() || LHSType->isBlockPointerType())))) {
6695 RHS = ImpCastExprToType(RHS.take(), LHSType,
6696 LHSType->isMemberPointerType()
John McCall2de56d12010-08-25 11:45:40 +00006697 ? CK_NullToMemberPointer
John McCall404cd162010-11-13 01:35:44 +00006698 : CK_NullToPointer);
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006699 return ResultTy;
6700 }
Douglas Gregor20b3e992009-08-24 17:42:35 +00006701 if (LHSIsNull &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006702 ((RHSType->isAnyPointerType() || RHSType->isNullPtrType()) ||
Richard Trieuccd891a2011-09-09 01:45:06 +00006703 (!IsRelational &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006704 (RHSType->isMemberPointerType() || RHSType->isBlockPointerType())))) {
6705 LHS = ImpCastExprToType(LHS.take(), RHSType,
6706 RHSType->isMemberPointerType()
John McCall2de56d12010-08-25 11:45:40 +00006707 ? CK_NullToMemberPointer
John McCall404cd162010-11-13 01:35:44 +00006708 : CK_NullToPointer);
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006709 return ResultTy;
6710 }
Douglas Gregor20b3e992009-08-24 17:42:35 +00006711
6712 // Comparison of member pointers.
Richard Trieuccd891a2011-09-09 01:45:06 +00006713 if (!IsRelational &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006714 LHSType->isMemberPointerType() && RHSType->isMemberPointerType()) {
6715 if (convertPointersToCompositeType(*this, Loc, LHS, RHS))
Douglas Gregor20b3e992009-08-24 17:42:35 +00006716 return QualType();
Richard Trieu7be1be02011-09-02 02:55:45 +00006717 else
6718 return ResultTy;
Douglas Gregor20b3e992009-08-24 17:42:35 +00006719 }
Douglas Gregor90566c02011-03-01 17:16:20 +00006720
6721 // Handle scoped enumeration types specifically, since they don't promote
6722 // to integers.
Richard Trieuf1775fb2011-09-06 21:43:51 +00006723 if (LHS.get()->getType()->isEnumeralType() &&
6724 Context.hasSameUnqualifiedType(LHS.get()->getType(),
6725 RHS.get()->getType()))
Douglas Gregor90566c02011-03-01 17:16:20 +00006726 return ResultTy;
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006727 }
Mike Stump1eb44332009-09-09 15:08:12 +00006728
Steve Naroff1c7d0672008-09-04 15:10:53 +00006729 // Handle block pointer types.
Richard Trieuccd891a2011-09-09 01:45:06 +00006730 if (!IsRelational && LHSType->isBlockPointerType() &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006731 RHSType->isBlockPointerType()) {
John McCall1d9b3b22011-09-09 05:25:32 +00006732 QualType lpointee = LHSType->castAs<BlockPointerType>()->getPointeeType();
6733 QualType rpointee = RHSType->castAs<BlockPointerType>()->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006734
Steve Naroff1c7d0672008-09-04 15:10:53 +00006735 if (!LHSIsNull && !RHSIsNull &&
Eli Friedman26784c12009-06-08 05:08:54 +00006736 !Context.typesAreCompatible(lpointee, rpointee)) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00006737 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
Richard Trieuf1775fb2011-09-06 21:43:51 +00006738 << LHSType << RHSType << LHS.get()->getSourceRange()
6739 << RHS.get()->getSourceRange();
Steve Naroff1c7d0672008-09-04 15:10:53 +00006740 }
Richard Trieuf1775fb2011-09-06 21:43:51 +00006741 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006742 return ResultTy;
Steve Naroff1c7d0672008-09-04 15:10:53 +00006743 }
John Wiegley429bb272011-04-08 18:41:53 +00006744
Steve Naroff59f53942008-09-28 01:11:11 +00006745 // Allow block pointers to be compared with null pointer constants.
Richard Trieuccd891a2011-09-09 01:45:06 +00006746 if (!IsRelational
Richard Trieuf1775fb2011-09-06 21:43:51 +00006747 && ((LHSType->isBlockPointerType() && RHSType->isPointerType())
6748 || (LHSType->isPointerType() && RHSType->isBlockPointerType()))) {
Steve Naroff59f53942008-09-28 01:11:11 +00006749 if (!LHSIsNull && !RHSIsNull) {
Richard Trieuf1775fb2011-09-06 21:43:51 +00006750 if (!((RHSType->isPointerType() && RHSType->castAs<PointerType>()
Mike Stumpdd3e1662009-05-07 03:14:14 +00006751 ->getPointeeType()->isVoidType())
Richard Trieuf1775fb2011-09-06 21:43:51 +00006752 || (LHSType->isPointerType() && LHSType->castAs<PointerType>()
Mike Stumpdd3e1662009-05-07 03:14:14 +00006753 ->getPointeeType()->isVoidType())))
6754 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
Richard Trieuf1775fb2011-09-06 21:43:51 +00006755 << LHSType << RHSType << LHS.get()->getSourceRange()
6756 << RHS.get()->getSourceRange();
Steve Naroff59f53942008-09-28 01:11:11 +00006757 }
John McCall34d6f932011-03-11 04:25:25 +00006758 if (LHSIsNull && !RHSIsNull)
John McCall1d9b3b22011-09-09 05:25:32 +00006759 LHS = ImpCastExprToType(LHS.take(), RHSType,
6760 RHSType->isPointerType() ? CK_BitCast
6761 : CK_AnyPointerToBlockPointerCast);
John McCall34d6f932011-03-11 04:25:25 +00006762 else
John McCall1d9b3b22011-09-09 05:25:32 +00006763 RHS = ImpCastExprToType(RHS.take(), LHSType,
6764 LHSType->isPointerType() ? CK_BitCast
6765 : CK_AnyPointerToBlockPointerCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006766 return ResultTy;
Steve Naroff59f53942008-09-28 01:11:11 +00006767 }
Steve Naroff1c7d0672008-09-04 15:10:53 +00006768
Richard Trieuf1775fb2011-09-06 21:43:51 +00006769 if (LHSType->isObjCObjectPointerType() ||
6770 RHSType->isObjCObjectPointerType()) {
6771 const PointerType *LPT = LHSType->getAs<PointerType>();
6772 const PointerType *RPT = RHSType->getAs<PointerType>();
John McCall34d6f932011-03-11 04:25:25 +00006773 if (LPT || RPT) {
6774 bool LPtrToVoid = LPT ? LPT->getPointeeType()->isVoidType() : false;
6775 bool RPtrToVoid = RPT ? RPT->getPointeeType()->isVoidType() : false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006776
Steve Naroffa8069f12008-11-17 19:49:16 +00006777 if (!LPtrToVoid && !RPtrToVoid &&
Richard Trieuf1775fb2011-09-06 21:43:51 +00006778 !Context.typesAreCompatible(LHSType, RHSType)) {
6779 diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS,
Richard Trieu7be1be02011-09-02 02:55:45 +00006780 /*isError*/false);
Steve Naroffa5ad8632008-10-27 10:33:19 +00006781 }
John McCall34d6f932011-03-11 04:25:25 +00006782 if (LHSIsNull && !RHSIsNull)
John McCall1d9b3b22011-09-09 05:25:32 +00006783 LHS = ImpCastExprToType(LHS.take(), RHSType,
6784 RPT ? CK_BitCast :CK_CPointerToObjCPointerCast);
John McCall34d6f932011-03-11 04:25:25 +00006785 else
John McCall1d9b3b22011-09-09 05:25:32 +00006786 RHS = ImpCastExprToType(RHS.take(), LHSType,
6787 LPT ? CK_BitCast :CK_CPointerToObjCPointerCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006788 return ResultTy;
Steve Naroff87f3b932008-10-20 18:19:10 +00006789 }
Richard Trieuf1775fb2011-09-06 21:43:51 +00006790 if (LHSType->isObjCObjectPointerType() &&
6791 RHSType->isObjCObjectPointerType()) {
6792 if (!Context.areComparableObjCPointerTypes(LHSType, RHSType))
6793 diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS,
Richard Trieu7be1be02011-09-02 02:55:45 +00006794 /*isError*/false);
John McCall34d6f932011-03-11 04:25:25 +00006795 if (LHSIsNull && !RHSIsNull)
Richard Trieuf1775fb2011-09-06 21:43:51 +00006796 LHS = ImpCastExprToType(LHS.take(), RHSType, CK_BitCast);
John McCall34d6f932011-03-11 04:25:25 +00006797 else
Richard Trieuf1775fb2011-09-06 21:43:51 +00006798 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006799 return ResultTy;
Steve Naroff20373222008-06-03 14:04:54 +00006800 }
Fariborz Jahanian7359f042007-12-20 01:06:58 +00006801 }
Richard Trieuf1775fb2011-09-06 21:43:51 +00006802 if ((LHSType->isAnyPointerType() && RHSType->isIntegerType()) ||
6803 (LHSType->isIntegerType() && RHSType->isAnyPointerType())) {
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006804 unsigned DiagID = 0;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006805 bool isError = false;
Richard Trieuf1775fb2011-09-06 21:43:51 +00006806 if ((LHSIsNull && LHSType->isIntegerType()) ||
6807 (RHSIsNull && RHSType->isIntegerType())) {
Richard Trieuccd891a2011-09-09 01:45:06 +00006808 if (IsRelational && !getLangOptions().CPlusPlus)
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006809 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero;
Richard Trieuccd891a2011-09-09 01:45:06 +00006810 } else if (IsRelational && !getLangOptions().CPlusPlus)
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006811 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006812 else if (getLangOptions().CPlusPlus) {
6813 DiagID = diag::err_typecheck_comparison_of_pointer_integer;
6814 isError = true;
6815 } else
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006816 DiagID = diag::ext_typecheck_comparison_of_pointer_integer;
Mike Stump1eb44332009-09-09 15:08:12 +00006817
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006818 if (DiagID) {
Chris Lattner6365e3e2009-08-22 18:58:31 +00006819 Diag(Loc, DiagID)
Richard Trieuf1775fb2011-09-06 21:43:51 +00006820 << LHSType << RHSType << LHS.get()->getSourceRange()
6821 << RHS.get()->getSourceRange();
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006822 if (isError)
6823 return QualType();
Chris Lattner6365e3e2009-08-22 18:58:31 +00006824 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006825
Richard Trieuf1775fb2011-09-06 21:43:51 +00006826 if (LHSType->isIntegerType())
6827 LHS = ImpCastExprToType(LHS.take(), RHSType,
John McCall404cd162010-11-13 01:35:44 +00006828 LHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006829 else
Richard Trieuf1775fb2011-09-06 21:43:51 +00006830 RHS = ImpCastExprToType(RHS.take(), LHSType,
John McCall404cd162010-11-13 01:35:44 +00006831 RHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006832 return ResultTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00006833 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006834
Steve Naroff39218df2008-09-04 16:56:14 +00006835 // Handle block pointers.
Richard Trieuccd891a2011-09-09 01:45:06 +00006836 if (!IsRelational && RHSIsNull
Richard Trieuf1775fb2011-09-06 21:43:51 +00006837 && LHSType->isBlockPointerType() && RHSType->isIntegerType()) {
6838 RHS = ImpCastExprToType(RHS.take(), LHSType, CK_NullToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006839 return ResultTy;
Steve Naroff39218df2008-09-04 16:56:14 +00006840 }
Richard Trieuccd891a2011-09-09 01:45:06 +00006841 if (!IsRelational && LHSIsNull
Richard Trieuf1775fb2011-09-06 21:43:51 +00006842 && LHSType->isIntegerType() && RHSType->isBlockPointerType()) {
6843 LHS = ImpCastExprToType(LHS.take(), RHSType, CK_NullToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006844 return ResultTy;
Steve Naroff39218df2008-09-04 16:56:14 +00006845 }
Douglas Gregor90566c02011-03-01 17:16:20 +00006846
Richard Trieuf1775fb2011-09-06 21:43:51 +00006847 return InvalidOperands(Loc, LHS, RHS);
Reid Spencer5f016e22007-07-11 17:01:13 +00006848}
6849
Nate Begemanbe2341d2008-07-14 18:02:46 +00006850/// CheckVectorCompareOperands - vector comparisons are a clang extension that
Mike Stumpeed9cac2009-02-19 03:04:26 +00006851/// operates on extended vector types. Instead of producing an IntTy result,
Nate Begemanbe2341d2008-07-14 18:02:46 +00006852/// like a scalar comparison, a vector comparison produces a vector of integer
6853/// types.
Richard Trieu9f60dee2011-09-07 01:19:57 +00006854QualType Sema::CheckVectorCompareOperands(ExprResult &LHS, ExprResult &RHS,
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006855 SourceLocation Loc,
Richard Trieuccd891a2011-09-09 01:45:06 +00006856 bool IsRelational) {
Nate Begemanbe2341d2008-07-14 18:02:46 +00006857 // Check to make sure we're operating on vectors of the same type and width,
6858 // Allowing one side to be a scalar of element type.
Richard Trieu9f60dee2011-09-07 01:19:57 +00006859 QualType vType = CheckVectorOperands(LHS, RHS, Loc, /*isCompAssign*/false);
Nate Begemanbe2341d2008-07-14 18:02:46 +00006860 if (vType.isNull())
6861 return vType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006862
Richard Trieu9f60dee2011-09-07 01:19:57 +00006863 QualType LHSType = LHS.get()->getType();
6864 QualType RHSType = RHS.get()->getType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006865
Anton Yartsev7870b132011-03-27 15:36:07 +00006866 // If AltiVec, the comparison results in a numeric type, i.e.
6867 // bool for C++, int for C
Anton Yartsev6305f722011-03-28 21:00:05 +00006868 if (vType->getAs<VectorType>()->getVectorKind() == VectorType::AltiVecVector)
Anton Yartsev7870b132011-03-27 15:36:07 +00006869 return Context.getLogicalOperationType();
6870
Nate Begemanbe2341d2008-07-14 18:02:46 +00006871 // For non-floating point types, check for self-comparisons of the form
6872 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
6873 // often indicate logic errors in the program.
Richard Trieu9f60dee2011-09-07 01:19:57 +00006874 if (!LHSType->hasFloatingRepresentation()) {
Richard Smith9c129f82011-10-28 03:31:48 +00006875 if (DeclRefExpr* DRL
6876 = dyn_cast<DeclRefExpr>(LHS.get()->IgnoreParenImpCasts()))
6877 if (DeclRefExpr* DRR
6878 = dyn_cast<DeclRefExpr>(RHS.get()->IgnoreParenImpCasts()))
Nate Begemanbe2341d2008-07-14 18:02:46 +00006879 if (DRL->getDecl() == DRR->getDecl())
Ted Kremenek351ba912011-02-23 01:52:04 +00006880 DiagRuntimeBehavior(Loc, 0,
Douglas Gregord64fdd02010-06-08 19:50:34 +00006881 PDiag(diag::warn_comparison_always)
6882 << 0 // self-
6883 << 2 // "a constant"
6884 );
Nate Begemanbe2341d2008-07-14 18:02:46 +00006885 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006886
Nate Begemanbe2341d2008-07-14 18:02:46 +00006887 // Check for comparisons of floating point operands using != and ==.
Richard Trieuccd891a2011-09-09 01:45:06 +00006888 if (!IsRelational && LHSType->hasFloatingRepresentation()) {
Richard Trieu9f60dee2011-09-07 01:19:57 +00006889 assert (RHSType->hasFloatingRepresentation());
6890 CheckFloatComparison(Loc, LHS.get(), RHS.get());
Nate Begemanbe2341d2008-07-14 18:02:46 +00006891 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006892
Tanya Lattner6ec96432011-10-17 21:00:38 +00006893 // Return a signed type that is of identical size and number of elements.
6894 // For floating point vectors, return an integer type of identical size
6895 // and number of elements.
Richard Trieu9f60dee2011-09-07 01:19:57 +00006896 const VectorType *VTy = LHSType->getAs<VectorType>();
Nate Begemanbe2341d2008-07-14 18:02:46 +00006897 unsigned TypeSize = Context.getTypeSize(VTy->getElementType());
Tanya Lattner6ec96432011-10-17 21:00:38 +00006898 if (TypeSize == Context.getTypeSize(Context.CharTy))
6899 return Context.getExtVectorType(Context.CharTy, VTy->getNumElements());
6900 else if (TypeSize == Context.getTypeSize(Context.ShortTy))
6901 return Context.getExtVectorType(Context.ShortTy, VTy->getNumElements());
6902 else if (TypeSize == Context.getTypeSize(Context.IntTy))
Nate Begemanbe2341d2008-07-14 18:02:46 +00006903 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements());
Tanya Lattner6ec96432011-10-17 21:00:38 +00006904 else if (TypeSize == Context.getTypeSize(Context.LongTy))
Nate Begeman59b5da62009-01-18 03:20:47 +00006905 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements());
Mike Stumpeed9cac2009-02-19 03:04:26 +00006906 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) &&
Nate Begeman59b5da62009-01-18 03:20:47 +00006907 "Unhandled vector element size in vector compare");
Nate Begemanbe2341d2008-07-14 18:02:46 +00006908 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements());
6909}
6910
Reid Spencer5f016e22007-07-11 17:01:13 +00006911inline QualType Sema::CheckBitwiseOperands(
Richard Trieuccd891a2011-09-09 01:45:06 +00006912 ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign) {
Richard Trieu481037f2011-09-16 00:53:10 +00006913 checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
6914
Richard Trieu9f60dee2011-09-07 01:19:57 +00006915 if (LHS.get()->getType()->isVectorType() ||
6916 RHS.get()->getType()->isVectorType()) {
6917 if (LHS.get()->getType()->hasIntegerRepresentation() &&
6918 RHS.get()->getType()->hasIntegerRepresentation())
Richard Trieuccd891a2011-09-09 01:45:06 +00006919 return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign);
Douglas Gregorf6094622010-07-23 15:58:24 +00006920
Richard Trieu9f60dee2011-09-07 01:19:57 +00006921 return InvalidOperands(Loc, LHS, RHS);
Douglas Gregorf6094622010-07-23 15:58:24 +00006922 }
Steve Naroff90045e82007-07-13 23:32:42 +00006923
Richard Trieu9f60dee2011-09-07 01:19:57 +00006924 ExprResult LHSResult = Owned(LHS), RHSResult = Owned(RHS);
6925 QualType compType = UsualArithmeticConversions(LHSResult, RHSResult,
Richard Trieuccd891a2011-09-09 01:45:06 +00006926 IsCompAssign);
Richard Trieu9f60dee2011-09-07 01:19:57 +00006927 if (LHSResult.isInvalid() || RHSResult.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006928 return QualType();
Richard Trieu9f60dee2011-09-07 01:19:57 +00006929 LHS = LHSResult.take();
6930 RHS = RHSResult.take();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006931
Richard Trieu9f60dee2011-09-07 01:19:57 +00006932 if (LHS.get()->getType()->isIntegralOrUnscopedEnumerationType() &&
6933 RHS.get()->getType()->isIntegralOrUnscopedEnumerationType())
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00006934 return compType;
Richard Trieu9f60dee2011-09-07 01:19:57 +00006935 return InvalidOperands(Loc, LHS, RHS);
Reid Spencer5f016e22007-07-11 17:01:13 +00006936}
6937
6938inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14]
Richard Trieu9f60dee2011-09-07 01:19:57 +00006939 ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, unsigned Opc) {
Chris Lattner90a8f272010-07-13 19:41:32 +00006940
6941 // Diagnose cases where the user write a logical and/or but probably meant a
6942 // bitwise one. We do this when the LHS is a non-bool integer and the RHS
6943 // is a constant.
Richard Trieu9f60dee2011-09-07 01:19:57 +00006944 if (LHS.get()->getType()->isIntegerType() &&
6945 !LHS.get()->getType()->isBooleanType() &&
6946 RHS.get()->getType()->isIntegerType() && !RHS.get()->isValueDependent() &&
Richard Trieue5adf592011-07-15 00:00:51 +00006947 // Don't warn in macros or template instantiations.
6948 !Loc.isMacroID() && ActiveTemplateInstantiations.empty()) {
Chris Lattnerb7690b42010-07-24 01:10:11 +00006949 // If the RHS can be constant folded, and if it constant folds to something
6950 // that isn't 0 or 1 (which indicate a potential logical operation that
6951 // happened to fold to true/false) then warn.
Chandler Carruth0683a142011-05-31 05:41:42 +00006952 // Parens on the RHS are ignored.
Richard Smith909c5552011-10-16 23:01:09 +00006953 llvm::APSInt Result;
6954 if (RHS.get()->EvaluateAsInt(Result, Context))
Richard Trieu9f60dee2011-09-07 01:19:57 +00006955 if ((getLangOptions().Bool && !RHS.get()->getType()->isBooleanType()) ||
Richard Smith909c5552011-10-16 23:01:09 +00006956 (Result != 0 && Result != 1)) {
Chandler Carruth0683a142011-05-31 05:41:42 +00006957 Diag(Loc, diag::warn_logical_instead_of_bitwise)
Richard Trieu9f60dee2011-09-07 01:19:57 +00006958 << RHS.get()->getSourceRange()
Matt Beaumont-Gay9b127f32011-08-15 17:50:06 +00006959 << (Opc == BO_LAnd ? "&&" : "||");
6960 // Suggest replacing the logical operator with the bitwise version
6961 Diag(Loc, diag::note_logical_instead_of_bitwise_change_operator)
6962 << (Opc == BO_LAnd ? "&" : "|")
6963 << FixItHint::CreateReplacement(SourceRange(
6964 Loc, Lexer::getLocForEndOfToken(Loc, 0, getSourceManager(),
6965 getLangOptions())),
6966 Opc == BO_LAnd ? "&" : "|");
6967 if (Opc == BO_LAnd)
6968 // Suggest replacing "Foo() && kNonZero" with "Foo()"
6969 Diag(Loc, diag::note_logical_instead_of_bitwise_remove_constant)
6970 << FixItHint::CreateRemoval(
6971 SourceRange(
Richard Trieu9f60dee2011-09-07 01:19:57 +00006972 Lexer::getLocForEndOfToken(LHS.get()->getLocEnd(),
Matt Beaumont-Gay9b127f32011-08-15 17:50:06 +00006973 0, getSourceManager(),
6974 getLangOptions()),
Richard Trieu9f60dee2011-09-07 01:19:57 +00006975 RHS.get()->getLocEnd()));
Matt Beaumont-Gay9b127f32011-08-15 17:50:06 +00006976 }
Chris Lattnerb7690b42010-07-24 01:10:11 +00006977 }
Chris Lattner90a8f272010-07-13 19:41:32 +00006978
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006979 if (!Context.getLangOptions().CPlusPlus) {
Richard Trieu9f60dee2011-09-07 01:19:57 +00006980 LHS = UsualUnaryConversions(LHS.take());
6981 if (LHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006982 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006983
Richard Trieu9f60dee2011-09-07 01:19:57 +00006984 RHS = UsualUnaryConversions(RHS.take());
6985 if (RHS.isInvalid())
John Wiegley429bb272011-04-08 18:41:53 +00006986 return QualType();
6987
Richard Trieu9f60dee2011-09-07 01:19:57 +00006988 if (!LHS.get()->getType()->isScalarType() ||
6989 !RHS.get()->getType()->isScalarType())
6990 return InvalidOperands(Loc, LHS, RHS);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006991
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006992 return Context.IntTy;
Anders Carlsson04905012009-10-16 01:44:21 +00006993 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006994
John McCall75f7c0f2010-06-04 00:29:51 +00006995 // The following is safe because we only use this method for
6996 // non-overloadable operands.
6997
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006998 // C++ [expr.log.and]p1
6999 // C++ [expr.log.or]p1
John McCall75f7c0f2010-06-04 00:29:51 +00007000 // The operands are both contextually converted to type bool.
Richard Trieu9f60dee2011-09-07 01:19:57 +00007001 ExprResult LHSRes = PerformContextuallyConvertToBool(LHS.get());
7002 if (LHSRes.isInvalid())
7003 return InvalidOperands(Loc, LHS, RHS);
7004 LHS = move(LHSRes);
John Wiegley429bb272011-04-08 18:41:53 +00007005
Richard Trieu9f60dee2011-09-07 01:19:57 +00007006 ExprResult RHSRes = PerformContextuallyConvertToBool(RHS.get());
7007 if (RHSRes.isInvalid())
7008 return InvalidOperands(Loc, LHS, RHS);
7009 RHS = move(RHSRes);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007010
Anders Carlssona4c98cd2009-11-23 21:47:44 +00007011 // C++ [expr.log.and]p2
7012 // C++ [expr.log.or]p2
7013 // The result is a bool.
7014 return Context.BoolTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00007015}
7016
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00007017/// IsReadonlyProperty - Verify that otherwise a valid l-value expression
7018/// is a read-only property; return true if so. A readonly property expression
7019/// depends on various declarations and thus must be treated specially.
7020///
Mike Stump1eb44332009-09-09 15:08:12 +00007021static bool IsReadonlyProperty(Expr *E, Sema &S) {
John McCall3c3b7f92011-10-25 17:37:35 +00007022 const ObjCPropertyRefExpr *PropExpr = dyn_cast<ObjCPropertyRefExpr>(E);
7023 if (!PropExpr) return false;
7024 if (PropExpr->isImplicitProperty()) return false;
John McCall12f78a62010-12-02 01:19:52 +00007025
John McCall3c3b7f92011-10-25 17:37:35 +00007026 ObjCPropertyDecl *PDecl = PropExpr->getExplicitProperty();
7027 QualType BaseType = PropExpr->isSuperReceiver() ?
John McCall12f78a62010-12-02 01:19:52 +00007028 PropExpr->getSuperReceiverType() :
Fariborz Jahanian8ac2d442010-10-14 16:04:05 +00007029 PropExpr->getBase()->getType();
7030
John McCall3c3b7f92011-10-25 17:37:35 +00007031 if (const ObjCObjectPointerType *OPT =
7032 BaseType->getAsObjCInterfacePointerType())
7033 if (ObjCInterfaceDecl *IFace = OPT->getInterfaceDecl())
7034 if (S.isPropertyReadonly(PDecl, IFace))
7035 return true;
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00007036 return false;
7037}
7038
Fariborz Jahanian14086762011-03-28 23:47:18 +00007039static bool IsConstProperty(Expr *E, Sema &S) {
John McCall3c3b7f92011-10-25 17:37:35 +00007040 const ObjCPropertyRefExpr *PropExpr = dyn_cast<ObjCPropertyRefExpr>(E);
7041 if (!PropExpr) return false;
7042 if (PropExpr->isImplicitProperty()) return false;
Fariborz Jahanian14086762011-03-28 23:47:18 +00007043
John McCall3c3b7f92011-10-25 17:37:35 +00007044 ObjCPropertyDecl *PDecl = PropExpr->getExplicitProperty();
7045 QualType T = PDecl->getType().getNonReferenceType();
7046 return T.isConstQualified();
Fariborz Jahanian14086762011-03-28 23:47:18 +00007047}
7048
Fariborz Jahanian077f4902011-03-26 19:48:30 +00007049static bool IsReadonlyMessage(Expr *E, Sema &S) {
John McCall3c3b7f92011-10-25 17:37:35 +00007050 const MemberExpr *ME = dyn_cast<MemberExpr>(E);
7051 if (!ME) return false;
7052 if (!isa<FieldDecl>(ME->getMemberDecl())) return false;
7053 ObjCMessageExpr *Base =
7054 dyn_cast<ObjCMessageExpr>(ME->getBase()->IgnoreParenImpCasts());
7055 if (!Base) return false;
7056 return Base->getMethodDecl() != 0;
Fariborz Jahanian077f4902011-03-26 19:48:30 +00007057}
7058
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007059/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not,
7060/// emit an error and return true. If so, return false.
7061static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) {
Daniel Dunbar44e35f72009-04-15 00:08:05 +00007062 SourceLocation OrigLoc = Loc;
Mike Stump1eb44332009-09-09 15:08:12 +00007063 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context,
Daniel Dunbar44e35f72009-04-15 00:08:05 +00007064 &Loc);
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00007065 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S))
7066 IsLV = Expr::MLV_ReadonlyProperty;
Fariborz Jahanian14086762011-03-28 23:47:18 +00007067 else if (Expr::MLV_ConstQualified && IsConstProperty(E, S))
7068 IsLV = Expr::MLV_Valid;
Fariborz Jahanian077f4902011-03-26 19:48:30 +00007069 else if (IsLV == Expr::MLV_ClassTemporary && IsReadonlyMessage(E, S))
7070 IsLV = Expr::MLV_InvalidMessageExpression;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007071 if (IsLV == Expr::MLV_Valid)
7072 return false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00007073
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007074 unsigned Diag = 0;
7075 bool NeedType = false;
7076 switch (IsLV) { // C99 6.5.16p2
John McCallf85e1932011-06-15 23:02:42 +00007077 case Expr::MLV_ConstQualified:
7078 Diag = diag::err_typecheck_assign_const;
7079
John McCall7acddac2011-06-17 06:42:21 +00007080 // In ARC, use some specialized diagnostics for occasions where we
7081 // infer 'const'. These are always pseudo-strong variables.
John McCallf85e1932011-06-15 23:02:42 +00007082 if (S.getLangOptions().ObjCAutoRefCount) {
7083 DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts());
7084 if (declRef && isa<VarDecl>(declRef->getDecl())) {
7085 VarDecl *var = cast<VarDecl>(declRef->getDecl());
7086
John McCall7acddac2011-06-17 06:42:21 +00007087 // Use the normal diagnostic if it's pseudo-__strong but the
7088 // user actually wrote 'const'.
7089 if (var->isARCPseudoStrong() &&
7090 (!var->getTypeSourceInfo() ||
7091 !var->getTypeSourceInfo()->getType().isConstQualified())) {
7092 // There are two pseudo-strong cases:
7093 // - self
John McCallf85e1932011-06-15 23:02:42 +00007094 ObjCMethodDecl *method = S.getCurMethodDecl();
7095 if (method && var == method->getSelfDecl())
Ted Kremenek2bbcd5c2011-11-14 21:59:25 +00007096 Diag = method->isClassMethod()
7097 ? diag::err_typecheck_arc_assign_self_class_method
7098 : diag::err_typecheck_arc_assign_self;
John McCall7acddac2011-06-17 06:42:21 +00007099
7100 // - fast enumeration variables
7101 else
John McCallf85e1932011-06-15 23:02:42 +00007102 Diag = diag::err_typecheck_arr_assign_enumeration;
John McCall7acddac2011-06-17 06:42:21 +00007103
John McCallf85e1932011-06-15 23:02:42 +00007104 SourceRange Assign;
7105 if (Loc != OrigLoc)
7106 Assign = SourceRange(OrigLoc, OrigLoc);
7107 S.Diag(Loc, Diag) << E->getSourceRange() << Assign;
7108 // We need to preserve the AST regardless, so migration tool
7109 // can do its job.
7110 return false;
7111 }
7112 }
7113 }
7114
7115 break;
Mike Stumpeed9cac2009-02-19 03:04:26 +00007116 case Expr::MLV_ArrayType:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007117 Diag = diag::err_typecheck_array_not_modifiable_lvalue;
7118 NeedType = true;
7119 break;
Mike Stumpeed9cac2009-02-19 03:04:26 +00007120 case Expr::MLV_NotObjectType:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007121 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue;
7122 NeedType = true;
7123 break;
Chris Lattnerca354fa2008-11-17 19:51:54 +00007124 case Expr::MLV_LValueCast:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007125 Diag = diag::err_typecheck_lvalue_casts_not_supported;
7126 break;
Douglas Gregore873fb72010-02-16 21:39:57 +00007127 case Expr::MLV_Valid:
7128 llvm_unreachable("did not take early return for MLV_Valid");
Chris Lattner5cf216b2008-01-04 18:04:52 +00007129 case Expr::MLV_InvalidExpression:
Douglas Gregore873fb72010-02-16 21:39:57 +00007130 case Expr::MLV_MemberFunction:
7131 case Expr::MLV_ClassTemporary:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007132 Diag = diag::err_typecheck_expression_not_modifiable_lvalue;
7133 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00007134 case Expr::MLV_IncompleteType:
7135 case Expr::MLV_IncompleteVoidType:
Douglas Gregor86447ec2009-03-09 16:13:40 +00007136 return S.RequireCompleteType(Loc, E->getType(),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00007137 S.PDiag(diag::err_typecheck_incomplete_type_not_modifiable_lvalue)
Anders Carlssonb7906612009-08-26 23:45:07 +00007138 << E->getSourceRange());
Chris Lattner5cf216b2008-01-04 18:04:52 +00007139 case Expr::MLV_DuplicateVectorComponents:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007140 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue;
7141 break;
Steve Naroff4f6a7d72008-09-26 14:41:28 +00007142 case Expr::MLV_NotBlockQualified:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007143 Diag = diag::err_block_decl_ref_not_modifiable_lvalue;
7144 break;
Fariborz Jahanian5daf5702008-11-22 18:39:36 +00007145 case Expr::MLV_ReadonlyProperty:
Fariborz Jahanianba8d2d62008-11-22 20:25:50 +00007146 case Expr::MLV_NoSetterProperty:
John McCall3c3b7f92011-10-25 17:37:35 +00007147 llvm_unreachable("readonly properties should be processed differently");
Fariborz Jahanianba8d2d62008-11-22 20:25:50 +00007148 break;
Fariborz Jahanian077f4902011-03-26 19:48:30 +00007149 case Expr::MLV_InvalidMessageExpression:
7150 Diag = diag::error_readonly_message_assignment;
7151 break;
Fariborz Jahanian2514a302009-12-15 23:59:41 +00007152 case Expr::MLV_SubObjCPropertySetting:
7153 Diag = diag::error_no_subobject_property_setting;
7154 break;
Reid Spencer5f016e22007-07-11 17:01:13 +00007155 }
Steve Naroffd1861fd2007-07-31 12:34:36 +00007156
Daniel Dunbar44e35f72009-04-15 00:08:05 +00007157 SourceRange Assign;
7158 if (Loc != OrigLoc)
7159 Assign = SourceRange(OrigLoc, OrigLoc);
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007160 if (NeedType)
Daniel Dunbar44e35f72009-04-15 00:08:05 +00007161 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007162 else
Mike Stump1eb44332009-09-09 15:08:12 +00007163 S.Diag(Loc, Diag) << E->getSourceRange() << Assign;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007164 return true;
7165}
7166
7167
7168
7169// C99 6.5.16.1
Richard Trieu268942b2011-09-07 01:33:52 +00007170QualType Sema::CheckAssignmentOperands(Expr *LHSExpr, ExprResult &RHS,
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007171 SourceLocation Loc,
7172 QualType CompoundType) {
John McCall3c3b7f92011-10-25 17:37:35 +00007173 assert(!LHSExpr->hasPlaceholderType(BuiltinType::PseudoObject));
7174
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007175 // Verify that LHS is a modifiable lvalue, and emit error if not.
Richard Trieu268942b2011-09-07 01:33:52 +00007176 if (CheckForModifiableLvalue(LHSExpr, Loc, *this))
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00007177 return QualType();
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007178
Richard Trieu268942b2011-09-07 01:33:52 +00007179 QualType LHSType = LHSExpr->getType();
Richard Trieu67e29332011-08-02 04:35:43 +00007180 QualType RHSType = CompoundType.isNull() ? RHS.get()->getType() :
7181 CompoundType;
Chris Lattner5cf216b2008-01-04 18:04:52 +00007182 AssignConvertType ConvTy;
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007183 if (CompoundType.isNull()) {
Fariborz Jahaniane2a901a2010-06-07 22:02:01 +00007184 QualType LHSTy(LHSType);
Fariborz Jahaniane2a901a2010-06-07 22:02:01 +00007185 ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
John Wiegley429bb272011-04-08 18:41:53 +00007186 if (RHS.isInvalid())
7187 return QualType();
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00007188 // Special case of NSObject attributes on c-style pointer types.
7189 if (ConvTy == IncompatiblePointer &&
7190 ((Context.isObjCNSObjectType(LHSType) &&
Steve Narofff4954562009-07-16 15:41:00 +00007191 RHSType->isObjCObjectPointerType()) ||
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00007192 (Context.isObjCNSObjectType(RHSType) &&
Steve Narofff4954562009-07-16 15:41:00 +00007193 LHSType->isObjCObjectPointerType())))
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00007194 ConvTy = Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00007195
John McCallf89e55a2010-11-18 06:31:45 +00007196 if (ConvTy == Compatible &&
7197 getLangOptions().ObjCNonFragileABI &&
7198 LHSType->isObjCObjectType())
7199 Diag(Loc, diag::err_assignment_requires_nonfragile_object)
7200 << LHSType;
7201
Chris Lattner2c156472008-08-21 18:04:13 +00007202 // If the RHS is a unary plus or minus, check to see if they = and + are
7203 // right next to each other. If so, the user may have typo'd "x =+ 4"
7204 // instead of "x += 4".
John Wiegley429bb272011-04-08 18:41:53 +00007205 Expr *RHSCheck = RHS.get();
Chris Lattner2c156472008-08-21 18:04:13 +00007206 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck))
7207 RHSCheck = ICE->getSubExpr();
7208 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) {
John McCall2de56d12010-08-25 11:45:40 +00007209 if ((UO->getOpcode() == UO_Plus ||
7210 UO->getOpcode() == UO_Minus) &&
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007211 Loc.isFileID() && UO->getOperatorLoc().isFileID() &&
Chris Lattner2c156472008-08-21 18:04:13 +00007212 // Only if the two operators are exactly adjacent.
Argyrios Kyrtzidisa64ccef2011-09-19 20:40:19 +00007213 Loc.getLocWithOffset(1) == UO->getOperatorLoc() &&
Chris Lattner399bd1b2009-03-08 06:51:10 +00007214 // And there is a space or other character before the subexpr of the
7215 // unary +/-. We don't want to warn on "x=-1".
Argyrios Kyrtzidisa64ccef2011-09-19 20:40:19 +00007216 Loc.getLocWithOffset(2) != UO->getSubExpr()->getLocStart() &&
Chris Lattner3e872092009-03-09 07:11:10 +00007217 UO->getSubExpr()->getLocStart().isFileID()) {
Chris Lattnerd3a94e22008-11-20 06:06:08 +00007218 Diag(Loc, diag::warn_not_compound_assign)
John McCall2de56d12010-08-25 11:45:40 +00007219 << (UO->getOpcode() == UO_Plus ? "+" : "-")
Chris Lattnerd3a94e22008-11-20 06:06:08 +00007220 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc());
Chris Lattner399bd1b2009-03-08 06:51:10 +00007221 }
Chris Lattner2c156472008-08-21 18:04:13 +00007222 }
John McCallf85e1932011-06-15 23:02:42 +00007223
7224 if (ConvTy == Compatible) {
7225 if (LHSType.getObjCLifetime() == Qualifiers::OCL_Strong)
Richard Trieu268942b2011-09-07 01:33:52 +00007226 checkRetainCycles(LHSExpr, RHS.get());
Fariborz Jahanian921c1432011-06-24 18:25:34 +00007227 else if (getLangOptions().ObjCAutoRefCount)
Richard Trieu268942b2011-09-07 01:33:52 +00007228 checkUnsafeExprAssigns(Loc, LHSExpr, RHS.get());
John McCallf85e1932011-06-15 23:02:42 +00007229 }
Chris Lattner2c156472008-08-21 18:04:13 +00007230 } else {
7231 // Compound assignment "x += y"
Douglas Gregorb608b982011-01-28 02:26:04 +00007232 ConvTy = CheckAssignmentConstraints(Loc, LHSType, RHSType);
Chris Lattner2c156472008-08-21 18:04:13 +00007233 }
Chris Lattner5cf216b2008-01-04 18:04:52 +00007234
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007235 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType,
John Wiegley429bb272011-04-08 18:41:53 +00007236 RHS.get(), AA_Assigning))
Chris Lattner5cf216b2008-01-04 18:04:52 +00007237 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00007238
Richard Trieu268942b2011-09-07 01:33:52 +00007239 CheckForNullPointerDereference(*this, LHSExpr);
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00007240
Reid Spencer5f016e22007-07-11 17:01:13 +00007241 // C99 6.5.16p3: The type of an assignment expression is the type of the
7242 // left operand unless the left operand has qualified type, in which case
Mike Stumpeed9cac2009-02-19 03:04:26 +00007243 // it is the unqualified version of the type of the left operand.
Reid Spencer5f016e22007-07-11 17:01:13 +00007244 // C99 6.5.16.1p2: In simple assignment, the value of the right operand
7245 // is converted to the type of the assignment expression (above).
Chris Lattner73d0d4f2007-08-30 17:45:32 +00007246 // C++ 5.17p1: the type of the assignment expression is that of its left
Douglas Gregor2d833e32009-05-02 00:36:19 +00007247 // operand.
John McCall2bf6f492010-10-12 02:19:57 +00007248 return (getLangOptions().CPlusPlus
7249 ? LHSType : LHSType.getUnqualifiedType());
Reid Spencer5f016e22007-07-11 17:01:13 +00007250}
7251
Chris Lattner29a1cfb2008-11-18 01:30:42 +00007252// C99 6.5.17
John Wiegley429bb272011-04-08 18:41:53 +00007253static QualType CheckCommaOperands(Sema &S, ExprResult &LHS, ExprResult &RHS,
John McCall09431682010-11-18 19:01:18 +00007254 SourceLocation Loc) {
John Wiegley429bb272011-04-08 18:41:53 +00007255 S.DiagnoseUnusedExprResult(LHS.get());
Argyrios Kyrtzidis25973452010-06-30 10:53:14 +00007256
John McCallfb8721c2011-04-10 19:13:55 +00007257 LHS = S.CheckPlaceholderExpr(LHS.take());
7258 RHS = S.CheckPlaceholderExpr(RHS.take());
John Wiegley429bb272011-04-08 18:41:53 +00007259 if (LHS.isInvalid() || RHS.isInvalid())
Douglas Gregor7ad5d422010-11-09 21:07:58 +00007260 return QualType();
7261
John McCallcf2e5062010-10-12 07:14:40 +00007262 // C's comma performs lvalue conversion (C99 6.3.2.1) on both its
7263 // operands, but not unary promotions.
7264 // C++'s comma does not do any conversions at all (C++ [expr.comma]p1).
Eli Friedmanb1d796d2009-03-23 00:24:07 +00007265
John McCallf6a16482010-12-04 03:47:34 +00007266 // So we treat the LHS as a ignored value, and in C++ we allow the
7267 // containing site to determine what should be done with the RHS.
John Wiegley429bb272011-04-08 18:41:53 +00007268 LHS = S.IgnoredValueConversions(LHS.take());
7269 if (LHS.isInvalid())
7270 return QualType();
John McCallf6a16482010-12-04 03:47:34 +00007271
7272 if (!S.getLangOptions().CPlusPlus) {
John Wiegley429bb272011-04-08 18:41:53 +00007273 RHS = S.DefaultFunctionArrayLvalueConversion(RHS.take());
7274 if (RHS.isInvalid())
7275 return QualType();
7276 if (!RHS.get()->getType()->isVoidType())
Richard Trieu67e29332011-08-02 04:35:43 +00007277 S.RequireCompleteType(Loc, RHS.get()->getType(),
7278 diag::err_incomplete_type);
John McCallcf2e5062010-10-12 07:14:40 +00007279 }
Eli Friedmanb1d796d2009-03-23 00:24:07 +00007280
John Wiegley429bb272011-04-08 18:41:53 +00007281 return RHS.get()->getType();
Reid Spencer5f016e22007-07-11 17:01:13 +00007282}
7283
Steve Naroff49b45262007-07-13 16:58:59 +00007284/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine
7285/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions.
John McCall09431682010-11-18 19:01:18 +00007286static QualType CheckIncrementDecrementOperand(Sema &S, Expr *Op,
7287 ExprValueKind &VK,
7288 SourceLocation OpLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00007289 bool IsInc, bool IsPrefix) {
Sebastian Redl28507842009-02-26 14:39:58 +00007290 if (Op->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00007291 return S.Context.DependentTy;
Sebastian Redl28507842009-02-26 14:39:58 +00007292
Chris Lattner3528d352008-11-21 07:05:48 +00007293 QualType ResType = Op->getType();
7294 assert(!ResType.isNull() && "no type for increment/decrement expression");
Reid Spencer5f016e22007-07-11 17:01:13 +00007295
John McCall09431682010-11-18 19:01:18 +00007296 if (S.getLangOptions().CPlusPlus && ResType->isBooleanType()) {
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00007297 // Decrement of bool is not allowed.
Richard Trieuccd891a2011-09-09 01:45:06 +00007298 if (!IsInc) {
John McCall09431682010-11-18 19:01:18 +00007299 S.Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange();
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00007300 return QualType();
7301 }
7302 // Increment of bool sets it to true, but is deprecated.
John McCall09431682010-11-18 19:01:18 +00007303 S.Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange();
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00007304 } else if (ResType->isRealType()) {
Chris Lattner3528d352008-11-21 07:05:48 +00007305 // OK!
Steve Naroff58f9f2c2009-07-14 18:25:06 +00007306 } else if (ResType->isAnyPointerType()) {
Chris Lattner3528d352008-11-21 07:05:48 +00007307 // C99 6.5.2.4p2, 6.5.6p2
Chandler Carruth13b21be2011-06-27 08:02:19 +00007308 if (!checkArithmeticOpPointerOperand(S, OpLoc, Op))
Douglas Gregor4ec339f2009-01-19 19:26:10 +00007309 return QualType();
Chandler Carruth13b21be2011-06-27 08:02:19 +00007310
Fariborz Jahanian9f8a04f2009-07-16 17:59:14 +00007311 // Diagnose bad cases where we step over interface counts.
Richard Trieudb44a6b2011-09-01 22:53:23 +00007312 else if (!checkArithmethicPointerOnNonFragileABI(S, OpLoc, Op))
Fariborz Jahanian9f8a04f2009-07-16 17:59:14 +00007313 return QualType();
Eli Friedman5b088a12010-01-03 00:20:48 +00007314 } else if (ResType->isAnyComplexType()) {
Chris Lattner3528d352008-11-21 07:05:48 +00007315 // C99 does not support ++/-- on complex types, we allow as an extension.
John McCall09431682010-11-18 19:01:18 +00007316 S.Diag(OpLoc, diag::ext_integer_increment_complex)
Chris Lattnerd1625842008-11-24 06:25:27 +00007317 << ResType << Op->getSourceRange();
John McCall2cd11fe2010-10-12 02:09:17 +00007318 } else if (ResType->isPlaceholderType()) {
John McCallfb8721c2011-04-10 19:13:55 +00007319 ExprResult PR = S.CheckPlaceholderExpr(Op);
John McCall2cd11fe2010-10-12 02:09:17 +00007320 if (PR.isInvalid()) return QualType();
John McCall09431682010-11-18 19:01:18 +00007321 return CheckIncrementDecrementOperand(S, PR.take(), VK, OpLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00007322 IsInc, IsPrefix);
Anton Yartsev683564a2011-02-07 02:17:30 +00007323 } else if (S.getLangOptions().AltiVec && ResType->isVectorType()) {
7324 // OK! ( C/C++ Language Extensions for CBEA(Version 2.6) 10.3 )
Chris Lattner3528d352008-11-21 07:05:48 +00007325 } else {
John McCall09431682010-11-18 19:01:18 +00007326 S.Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement)
Richard Trieuccd891a2011-09-09 01:45:06 +00007327 << ResType << int(IsInc) << Op->getSourceRange();
Chris Lattner3528d352008-11-21 07:05:48 +00007328 return QualType();
Reid Spencer5f016e22007-07-11 17:01:13 +00007329 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007330 // At this point, we know we have a real, complex or pointer type.
Steve Naroffdd10e022007-08-23 21:37:33 +00007331 // Now make sure the operand is a modifiable lvalue.
John McCall09431682010-11-18 19:01:18 +00007332 if (CheckForModifiableLvalue(Op, OpLoc, S))
Reid Spencer5f016e22007-07-11 17:01:13 +00007333 return QualType();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00007334 // In C++, a prefix increment is the same type as the operand. Otherwise
7335 // (in C or with postfix), the increment is the unqualified type of the
7336 // operand.
Richard Trieuccd891a2011-09-09 01:45:06 +00007337 if (IsPrefix && S.getLangOptions().CPlusPlus) {
John McCall09431682010-11-18 19:01:18 +00007338 VK = VK_LValue;
7339 return ResType;
7340 } else {
7341 VK = VK_RValue;
7342 return ResType.getUnqualifiedType();
7343 }
Reid Spencer5f016e22007-07-11 17:01:13 +00007344}
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00007345
7346
Anders Carlsson369dee42008-02-01 07:15:58 +00007347/// getPrimaryDecl - Helper function for CheckAddressOfOperand().
Reid Spencer5f016e22007-07-11 17:01:13 +00007348/// This routine allows us to typecheck complex/recursive expressions
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007349/// where the declaration is needed for type checking. We only need to
7350/// handle cases when the expression references a function designator
7351/// or is an lvalue. Here are some examples:
7352/// - &(x) => x
7353/// - &*****f => f for f a function designator.
7354/// - &s.xx => s
7355/// - &s.zz[1].yy -> s, if zz is an array
7356/// - *(x + 1) -> x, if x is an array
7357/// - &"123"[2] -> 0
7358/// - & __real__ x -> x
John McCall5808ce42011-02-03 08:15:49 +00007359static ValueDecl *getPrimaryDecl(Expr *E) {
Chris Lattnerf0467b32008-04-02 04:24:33 +00007360 switch (E->getStmtClass()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00007361 case Stmt::DeclRefExprClass:
Chris Lattnerf0467b32008-04-02 04:24:33 +00007362 return cast<DeclRefExpr>(E)->getDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00007363 case Stmt::MemberExprClass:
Eli Friedman23d58ce2009-04-20 08:23:18 +00007364 // If this is an arrow operator, the address is an offset from
7365 // the base's value, so the object the base refers to is
7366 // irrelevant.
Chris Lattnerf0467b32008-04-02 04:24:33 +00007367 if (cast<MemberExpr>(E)->isArrow())
Chris Lattnerf82228f2007-11-16 17:46:48 +00007368 return 0;
Eli Friedman23d58ce2009-04-20 08:23:18 +00007369 // Otherwise, the expression refers to a part of the base
Chris Lattnerf0467b32008-04-02 04:24:33 +00007370 return getPrimaryDecl(cast<MemberExpr>(E)->getBase());
Anders Carlsson369dee42008-02-01 07:15:58 +00007371 case Stmt::ArraySubscriptExprClass: {
Mike Stump390b4cc2009-05-16 07:39:55 +00007372 // FIXME: This code shouldn't be necessary! We should catch the implicit
7373 // promotion of register arrays earlier.
Eli Friedman23d58ce2009-04-20 08:23:18 +00007374 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase();
7375 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) {
7376 if (ICE->getSubExpr()->getType()->isArrayType())
7377 return getPrimaryDecl(ICE->getSubExpr());
7378 }
7379 return 0;
Anders Carlsson369dee42008-02-01 07:15:58 +00007380 }
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007381 case Stmt::UnaryOperatorClass: {
7382 UnaryOperator *UO = cast<UnaryOperator>(E);
Mike Stumpeed9cac2009-02-19 03:04:26 +00007383
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007384 switch(UO->getOpcode()) {
John McCall2de56d12010-08-25 11:45:40 +00007385 case UO_Real:
7386 case UO_Imag:
7387 case UO_Extension:
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007388 return getPrimaryDecl(UO->getSubExpr());
7389 default:
7390 return 0;
7391 }
7392 }
Reid Spencer5f016e22007-07-11 17:01:13 +00007393 case Stmt::ParenExprClass:
Chris Lattnerf0467b32008-04-02 04:24:33 +00007394 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr());
Chris Lattnerf82228f2007-11-16 17:46:48 +00007395 case Stmt::ImplicitCastExprClass:
Eli Friedman23d58ce2009-04-20 08:23:18 +00007396 // If the result of an implicit cast is an l-value, we care about
7397 // the sub-expression; otherwise, the result here doesn't matter.
Chris Lattnerf0467b32008-04-02 04:24:33 +00007398 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr());
Reid Spencer5f016e22007-07-11 17:01:13 +00007399 default:
7400 return 0;
7401 }
7402}
7403
Richard Trieu5520f232011-09-07 21:46:33 +00007404namespace {
7405 enum {
7406 AO_Bit_Field = 0,
7407 AO_Vector_Element = 1,
7408 AO_Property_Expansion = 2,
7409 AO_Register_Variable = 3,
7410 AO_No_Error = 4
7411 };
7412}
Richard Trieu09a26ad2011-09-02 00:47:55 +00007413/// \brief Diagnose invalid operand for address of operations.
7414///
7415/// \param Type The type of operand which cannot have its address taken.
Richard Trieu09a26ad2011-09-02 00:47:55 +00007416static void diagnoseAddressOfInvalidType(Sema &S, SourceLocation Loc,
7417 Expr *E, unsigned Type) {
7418 S.Diag(Loc, diag::err_typecheck_address_of) << Type << E->getSourceRange();
7419}
7420
Reid Spencer5f016e22007-07-11 17:01:13 +00007421/// CheckAddressOfOperand - The operand of & must be either a function
Mike Stumpeed9cac2009-02-19 03:04:26 +00007422/// designator or an lvalue designating an object. If it is an lvalue, the
Reid Spencer5f016e22007-07-11 17:01:13 +00007423/// object cannot be declared with storage class register or be a bit field.
Mike Stumpeed9cac2009-02-19 03:04:26 +00007424/// Note: The usual conversions are *not* applied to the operand of the &
Reid Spencer5f016e22007-07-11 17:01:13 +00007425/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue.
Mike Stumpeed9cac2009-02-19 03:04:26 +00007426/// In C++, the operand might be an overloaded function name, in which case
Douglas Gregor904eed32008-11-10 20:40:00 +00007427/// we allow the '&' but retain the overloaded-function type.
John McCall3c3b7f92011-10-25 17:37:35 +00007428static QualType CheckAddressOfOperand(Sema &S, ExprResult &OrigOp,
John McCall09431682010-11-18 19:01:18 +00007429 SourceLocation OpLoc) {
John McCall3c3b7f92011-10-25 17:37:35 +00007430 if (const BuiltinType *PTy = OrigOp.get()->getType()->getAsPlaceholderType()){
7431 if (PTy->getKind() == BuiltinType::Overload) {
7432 if (!isa<OverloadExpr>(OrigOp.get()->IgnoreParens())) {
7433 S.Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof)
7434 << OrigOp.get()->getSourceRange();
7435 return QualType();
7436 }
7437
7438 return S.Context.OverloadTy;
7439 }
7440
7441 if (PTy->getKind() == BuiltinType::UnknownAny)
7442 return S.Context.UnknownAnyTy;
7443
7444 if (PTy->getKind() == BuiltinType::BoundMember) {
7445 S.Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
7446 << OrigOp.get()->getSourceRange();
Douglas Gregor44efed02011-10-09 19:10:41 +00007447 return QualType();
7448 }
John McCall3c3b7f92011-10-25 17:37:35 +00007449
7450 OrigOp = S.CheckPlaceholderExpr(OrigOp.take());
7451 if (OrigOp.isInvalid()) return QualType();
John McCall864c0412011-04-26 20:42:42 +00007452 }
John McCall9c72c602010-08-27 09:08:28 +00007453
John McCall3c3b7f92011-10-25 17:37:35 +00007454 if (OrigOp.get()->isTypeDependent())
7455 return S.Context.DependentTy;
7456
7457 assert(!OrigOp.get()->getType()->isPlaceholderType());
John McCall2cd11fe2010-10-12 02:09:17 +00007458
John McCall9c72c602010-08-27 09:08:28 +00007459 // Make sure to ignore parentheses in subsequent checks
John McCall3c3b7f92011-10-25 17:37:35 +00007460 Expr *op = OrigOp.get()->IgnoreParens();
Douglas Gregor9103bb22008-12-17 22:52:20 +00007461
John McCall09431682010-11-18 19:01:18 +00007462 if (S.getLangOptions().C99) {
Steve Naroff08f19672008-01-13 17:10:08 +00007463 // Implement C99-only parts of addressof rules.
7464 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) {
John McCall2de56d12010-08-25 11:45:40 +00007465 if (uOp->getOpcode() == UO_Deref)
Steve Naroff08f19672008-01-13 17:10:08 +00007466 // Per C99 6.5.3.2, the address of a deref always returns a valid result
7467 // (assuming the deref expression is valid).
7468 return uOp->getSubExpr()->getType();
7469 }
7470 // Technically, there should be a check for array subscript
7471 // expressions here, but the result of one is always an lvalue anyway.
7472 }
John McCall5808ce42011-02-03 08:15:49 +00007473 ValueDecl *dcl = getPrimaryDecl(op);
John McCall7eb0a9e2010-11-24 05:12:34 +00007474 Expr::LValueClassification lval = op->ClassifyLValue(S.Context);
Richard Trieu5520f232011-09-07 21:46:33 +00007475 unsigned AddressOfError = AO_No_Error;
Nuno Lopes6b6609f2008-12-16 22:59:47 +00007476
Fariborz Jahanian077f4902011-03-26 19:48:30 +00007477 if (lval == Expr::LV_ClassTemporary) {
John McCall09431682010-11-18 19:01:18 +00007478 bool sfinae = S.isSFINAEContext();
7479 S.Diag(OpLoc, sfinae ? diag::err_typecheck_addrof_class_temporary
7480 : diag::ext_typecheck_addrof_class_temporary)
Douglas Gregore873fb72010-02-16 21:39:57 +00007481 << op->getType() << op->getSourceRange();
John McCall09431682010-11-18 19:01:18 +00007482 if (sfinae)
Douglas Gregore873fb72010-02-16 21:39:57 +00007483 return QualType();
John McCall9c72c602010-08-27 09:08:28 +00007484 } else if (isa<ObjCSelectorExpr>(op)) {
John McCall09431682010-11-18 19:01:18 +00007485 return S.Context.getPointerType(op->getType());
John McCall9c72c602010-08-27 09:08:28 +00007486 } else if (lval == Expr::LV_MemberFunction) {
7487 // If it's an instance method, make a member pointer.
7488 // The expression must have exactly the form &A::foo.
7489
7490 // If the underlying expression isn't a decl ref, give up.
7491 if (!isa<DeclRefExpr>(op)) {
John McCall09431682010-11-18 19:01:18 +00007492 S.Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
John McCall3c3b7f92011-10-25 17:37:35 +00007493 << OrigOp.get()->getSourceRange();
John McCall9c72c602010-08-27 09:08:28 +00007494 return QualType();
7495 }
7496 DeclRefExpr *DRE = cast<DeclRefExpr>(op);
7497 CXXMethodDecl *MD = cast<CXXMethodDecl>(DRE->getDecl());
7498
7499 // The id-expression was parenthesized.
John McCall3c3b7f92011-10-25 17:37:35 +00007500 if (OrigOp.get() != DRE) {
John McCall09431682010-11-18 19:01:18 +00007501 S.Diag(OpLoc, diag::err_parens_pointer_member_function)
John McCall3c3b7f92011-10-25 17:37:35 +00007502 << OrigOp.get()->getSourceRange();
John McCall9c72c602010-08-27 09:08:28 +00007503
7504 // The method was named without a qualifier.
7505 } else if (!DRE->getQualifier()) {
John McCall09431682010-11-18 19:01:18 +00007506 S.Diag(OpLoc, diag::err_unqualified_pointer_member_function)
John McCall9c72c602010-08-27 09:08:28 +00007507 << op->getSourceRange();
7508 }
7509
John McCall09431682010-11-18 19:01:18 +00007510 return S.Context.getMemberPointerType(op->getType(),
7511 S.Context.getTypeDeclType(MD->getParent()).getTypePtr());
John McCall9c72c602010-08-27 09:08:28 +00007512 } else if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) {
Eli Friedman441cf102009-05-16 23:27:50 +00007513 // C99 6.5.3.2p1
Eli Friedman23d58ce2009-04-20 08:23:18 +00007514 // The operand must be either an l-value or a function designator
Eli Friedman441cf102009-05-16 23:27:50 +00007515 if (!op->getType()->isFunctionType()) {
John McCall3c3b7f92011-10-25 17:37:35 +00007516 // Use a special diagnostic for loads from property references.
John McCall4b9c2d22011-11-06 09:01:30 +00007517 if (isa<PseudoObjectExpr>(op)) {
John McCall3c3b7f92011-10-25 17:37:35 +00007518 AddressOfError = AO_Property_Expansion;
7519 } else {
7520 // FIXME: emit more specific diag...
7521 S.Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof)
7522 << op->getSourceRange();
7523 return QualType();
7524 }
Reid Spencer5f016e22007-07-11 17:01:13 +00007525 }
John McCall7eb0a9e2010-11-24 05:12:34 +00007526 } else if (op->getObjectKind() == OK_BitField) { // C99 6.5.3.2p1
Eli Friedman23d58ce2009-04-20 08:23:18 +00007527 // The operand cannot be a bit-field
Richard Trieu5520f232011-09-07 21:46:33 +00007528 AddressOfError = AO_Bit_Field;
John McCall7eb0a9e2010-11-24 05:12:34 +00007529 } else if (op->getObjectKind() == OK_VectorComponent) {
Eli Friedman23d58ce2009-04-20 08:23:18 +00007530 // The operand cannot be an element of a vector
Richard Trieu5520f232011-09-07 21:46:33 +00007531 AddressOfError = AO_Vector_Element;
Steve Naroffbcb2b612008-02-29 23:30:25 +00007532 } else if (dcl) { // C99 6.5.3.2p1
Mike Stumpeed9cac2009-02-19 03:04:26 +00007533 // We have an lvalue with a decl. Make sure the decl is not declared
Reid Spencer5f016e22007-07-11 17:01:13 +00007534 // with the register storage-class specifier.
7535 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) {
Fariborz Jahanian4020f872010-08-24 22:21:48 +00007536 // in C++ it is not error to take address of a register
7537 // variable (c++03 7.1.1P3)
John McCalld931b082010-08-26 03:08:43 +00007538 if (vd->getStorageClass() == SC_Register &&
John McCall09431682010-11-18 19:01:18 +00007539 !S.getLangOptions().CPlusPlus) {
Richard Trieu5520f232011-09-07 21:46:33 +00007540 AddressOfError = AO_Register_Variable;
Reid Spencer5f016e22007-07-11 17:01:13 +00007541 }
John McCallba135432009-11-21 08:51:07 +00007542 } else if (isa<FunctionTemplateDecl>(dcl)) {
John McCall09431682010-11-18 19:01:18 +00007543 return S.Context.OverloadTy;
John McCall5808ce42011-02-03 08:15:49 +00007544 } else if (isa<FieldDecl>(dcl) || isa<IndirectFieldDecl>(dcl)) {
Douglas Gregor29882052008-12-10 21:26:49 +00007545 // Okay: we can take the address of a field.
Sebastian Redlebc07d52009-02-03 20:19:35 +00007546 // Could be a pointer to member, though, if there is an explicit
7547 // scope qualifier for the class.
Douglas Gregora2813ce2009-10-23 18:54:35 +00007548 if (isa<DeclRefExpr>(op) && cast<DeclRefExpr>(op)->getQualifier()) {
Sebastian Redlebc07d52009-02-03 20:19:35 +00007549 DeclContext *Ctx = dcl->getDeclContext();
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00007550 if (Ctx && Ctx->isRecord()) {
John McCall5808ce42011-02-03 08:15:49 +00007551 if (dcl->getType()->isReferenceType()) {
John McCall09431682010-11-18 19:01:18 +00007552 S.Diag(OpLoc,
7553 diag::err_cannot_form_pointer_to_member_of_reference_type)
John McCall5808ce42011-02-03 08:15:49 +00007554 << dcl->getDeclName() << dcl->getType();
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00007555 return QualType();
7556 }
Mike Stump1eb44332009-09-09 15:08:12 +00007557
Argyrios Kyrtzidis0413db42011-01-31 07:04:29 +00007558 while (cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion())
7559 Ctx = Ctx->getParent();
John McCall09431682010-11-18 19:01:18 +00007560 return S.Context.getMemberPointerType(op->getType(),
7561 S.Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr());
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00007562 }
Sebastian Redlebc07d52009-02-03 20:19:35 +00007563 }
Eli Friedman7b2f51c2011-08-26 20:28:17 +00007564 } else if (!isa<FunctionDecl>(dcl) && !isa<NonTypeTemplateParmDecl>(dcl))
David Blaikieb219cfc2011-09-23 05:06:16 +00007565 llvm_unreachable("Unknown/unexpected decl type");
Reid Spencer5f016e22007-07-11 17:01:13 +00007566 }
Sebastian Redl33b399a2009-02-04 21:23:32 +00007567
Richard Trieu5520f232011-09-07 21:46:33 +00007568 if (AddressOfError != AO_No_Error) {
7569 diagnoseAddressOfInvalidType(S, OpLoc, op, AddressOfError);
7570 return QualType();
7571 }
7572
Eli Friedman441cf102009-05-16 23:27:50 +00007573 if (lval == Expr::LV_IncompleteVoidType) {
7574 // Taking the address of a void variable is technically illegal, but we
7575 // allow it in cases which are otherwise valid.
7576 // Example: "extern void x; void* y = &x;".
John McCall09431682010-11-18 19:01:18 +00007577 S.Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange();
Eli Friedman441cf102009-05-16 23:27:50 +00007578 }
7579
Reid Spencer5f016e22007-07-11 17:01:13 +00007580 // If the operand has type "type", the result has type "pointer to type".
Douglas Gregor8f70ddb2010-07-29 16:05:45 +00007581 if (op->getType()->isObjCObjectType())
John McCall09431682010-11-18 19:01:18 +00007582 return S.Context.getObjCObjectPointerType(op->getType());
7583 return S.Context.getPointerType(op->getType());
Reid Spencer5f016e22007-07-11 17:01:13 +00007584}
7585
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007586/// CheckIndirectionOperand - Type check unary indirection (prefix '*').
John McCall09431682010-11-18 19:01:18 +00007587static QualType CheckIndirectionOperand(Sema &S, Expr *Op, ExprValueKind &VK,
7588 SourceLocation OpLoc) {
Sebastian Redl28507842009-02-26 14:39:58 +00007589 if (Op->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00007590 return S.Context.DependentTy;
Sebastian Redl28507842009-02-26 14:39:58 +00007591
John Wiegley429bb272011-04-08 18:41:53 +00007592 ExprResult ConvResult = S.UsualUnaryConversions(Op);
7593 if (ConvResult.isInvalid())
7594 return QualType();
7595 Op = ConvResult.take();
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007596 QualType OpTy = Op->getType();
7597 QualType Result;
Argyrios Kyrtzidisf4bbbf02011-05-02 18:21:19 +00007598
7599 if (isa<CXXReinterpretCastExpr>(Op)) {
7600 QualType OpOrigType = Op->IgnoreParenCasts()->getType();
7601 S.CheckCompatibleReinterpretCast(OpOrigType, OpTy, /*IsDereference*/true,
7602 Op->getSourceRange());
7603 }
7604
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007605 // Note that per both C89 and C99, indirection is always legal, even if OpTy
7606 // is an incomplete type or void. It would be possible to warn about
7607 // dereferencing a void pointer, but it's completely well-defined, and such a
7608 // warning is unlikely to catch any mistakes.
7609 if (const PointerType *PT = OpTy->getAs<PointerType>())
7610 Result = PT->getPointeeType();
7611 else if (const ObjCObjectPointerType *OPT =
7612 OpTy->getAs<ObjCObjectPointerType>())
7613 Result = OPT->getPointeeType();
John McCall2cd11fe2010-10-12 02:09:17 +00007614 else {
John McCallfb8721c2011-04-10 19:13:55 +00007615 ExprResult PR = S.CheckPlaceholderExpr(Op);
John McCall2cd11fe2010-10-12 02:09:17 +00007616 if (PR.isInvalid()) return QualType();
John McCall09431682010-11-18 19:01:18 +00007617 if (PR.take() != Op)
7618 return CheckIndirectionOperand(S, PR.take(), VK, OpLoc);
John McCall2cd11fe2010-10-12 02:09:17 +00007619 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007620
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007621 if (Result.isNull()) {
John McCall09431682010-11-18 19:01:18 +00007622 S.Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer)
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007623 << OpTy << Op->getSourceRange();
7624 return QualType();
7625 }
John McCall09431682010-11-18 19:01:18 +00007626
7627 // Dereferences are usually l-values...
7628 VK = VK_LValue;
7629
7630 // ...except that certain expressions are never l-values in C.
Douglas Gregor2b1ad8b2011-06-23 00:49:38 +00007631 if (!S.getLangOptions().CPlusPlus && Result.isCForbiddenLValueType())
John McCall09431682010-11-18 19:01:18 +00007632 VK = VK_RValue;
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007633
7634 return Result;
Reid Spencer5f016e22007-07-11 17:01:13 +00007635}
7636
John McCall2de56d12010-08-25 11:45:40 +00007637static inline BinaryOperatorKind ConvertTokenKindToBinaryOpcode(
Reid Spencer5f016e22007-07-11 17:01:13 +00007638 tok::TokenKind Kind) {
John McCall2de56d12010-08-25 11:45:40 +00007639 BinaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00007640 switch (Kind) {
David Blaikieb219cfc2011-09-23 05:06:16 +00007641 default: llvm_unreachable("Unknown binop!");
John McCall2de56d12010-08-25 11:45:40 +00007642 case tok::periodstar: Opc = BO_PtrMemD; break;
7643 case tok::arrowstar: Opc = BO_PtrMemI; break;
7644 case tok::star: Opc = BO_Mul; break;
7645 case tok::slash: Opc = BO_Div; break;
7646 case tok::percent: Opc = BO_Rem; break;
7647 case tok::plus: Opc = BO_Add; break;
7648 case tok::minus: Opc = BO_Sub; break;
7649 case tok::lessless: Opc = BO_Shl; break;
7650 case tok::greatergreater: Opc = BO_Shr; break;
7651 case tok::lessequal: Opc = BO_LE; break;
7652 case tok::less: Opc = BO_LT; break;
7653 case tok::greaterequal: Opc = BO_GE; break;
7654 case tok::greater: Opc = BO_GT; break;
7655 case tok::exclaimequal: Opc = BO_NE; break;
7656 case tok::equalequal: Opc = BO_EQ; break;
7657 case tok::amp: Opc = BO_And; break;
7658 case tok::caret: Opc = BO_Xor; break;
7659 case tok::pipe: Opc = BO_Or; break;
7660 case tok::ampamp: Opc = BO_LAnd; break;
7661 case tok::pipepipe: Opc = BO_LOr; break;
7662 case tok::equal: Opc = BO_Assign; break;
7663 case tok::starequal: Opc = BO_MulAssign; break;
7664 case tok::slashequal: Opc = BO_DivAssign; break;
7665 case tok::percentequal: Opc = BO_RemAssign; break;
7666 case tok::plusequal: Opc = BO_AddAssign; break;
7667 case tok::minusequal: Opc = BO_SubAssign; break;
7668 case tok::lesslessequal: Opc = BO_ShlAssign; break;
7669 case tok::greatergreaterequal: Opc = BO_ShrAssign; break;
7670 case tok::ampequal: Opc = BO_AndAssign; break;
7671 case tok::caretequal: Opc = BO_XorAssign; break;
7672 case tok::pipeequal: Opc = BO_OrAssign; break;
7673 case tok::comma: Opc = BO_Comma; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00007674 }
7675 return Opc;
7676}
7677
John McCall2de56d12010-08-25 11:45:40 +00007678static inline UnaryOperatorKind ConvertTokenKindToUnaryOpcode(
Reid Spencer5f016e22007-07-11 17:01:13 +00007679 tok::TokenKind Kind) {
John McCall2de56d12010-08-25 11:45:40 +00007680 UnaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00007681 switch (Kind) {
David Blaikieb219cfc2011-09-23 05:06:16 +00007682 default: llvm_unreachable("Unknown unary op!");
John McCall2de56d12010-08-25 11:45:40 +00007683 case tok::plusplus: Opc = UO_PreInc; break;
7684 case tok::minusminus: Opc = UO_PreDec; break;
7685 case tok::amp: Opc = UO_AddrOf; break;
7686 case tok::star: Opc = UO_Deref; break;
7687 case tok::plus: Opc = UO_Plus; break;
7688 case tok::minus: Opc = UO_Minus; break;
7689 case tok::tilde: Opc = UO_Not; break;
7690 case tok::exclaim: Opc = UO_LNot; break;
7691 case tok::kw___real: Opc = UO_Real; break;
7692 case tok::kw___imag: Opc = UO_Imag; break;
7693 case tok::kw___extension__: Opc = UO_Extension; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00007694 }
7695 return Opc;
7696}
7697
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007698/// DiagnoseSelfAssignment - Emits a warning if a value is assigned to itself.
7699/// This warning is only emitted for builtin assignment operations. It is also
7700/// suppressed in the event of macro expansions.
Richard Trieu268942b2011-09-07 01:33:52 +00007701static void DiagnoseSelfAssignment(Sema &S, Expr *LHSExpr, Expr *RHSExpr,
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007702 SourceLocation OpLoc) {
7703 if (!S.ActiveTemplateInstantiations.empty())
7704 return;
7705 if (OpLoc.isInvalid() || OpLoc.isMacroID())
7706 return;
Richard Trieu268942b2011-09-07 01:33:52 +00007707 LHSExpr = LHSExpr->IgnoreParenImpCasts();
7708 RHSExpr = RHSExpr->IgnoreParenImpCasts();
7709 const DeclRefExpr *LHSDeclRef = dyn_cast<DeclRefExpr>(LHSExpr);
7710 const DeclRefExpr *RHSDeclRef = dyn_cast<DeclRefExpr>(RHSExpr);
7711 if (!LHSDeclRef || !RHSDeclRef ||
7712 LHSDeclRef->getLocation().isMacroID() ||
7713 RHSDeclRef->getLocation().isMacroID())
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007714 return;
Richard Trieu268942b2011-09-07 01:33:52 +00007715 const ValueDecl *LHSDecl =
7716 cast<ValueDecl>(LHSDeclRef->getDecl()->getCanonicalDecl());
7717 const ValueDecl *RHSDecl =
7718 cast<ValueDecl>(RHSDeclRef->getDecl()->getCanonicalDecl());
7719 if (LHSDecl != RHSDecl)
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007720 return;
Richard Trieu268942b2011-09-07 01:33:52 +00007721 if (LHSDecl->getType().isVolatileQualified())
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007722 return;
Richard Trieu268942b2011-09-07 01:33:52 +00007723 if (const ReferenceType *RefTy = LHSDecl->getType()->getAs<ReferenceType>())
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007724 if (RefTy->getPointeeType().isVolatileQualified())
7725 return;
7726
7727 S.Diag(OpLoc, diag::warn_self_assignment)
Richard Trieu268942b2011-09-07 01:33:52 +00007728 << LHSDeclRef->getType()
7729 << LHSExpr->getSourceRange() << RHSExpr->getSourceRange();
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007730}
7731
Douglas Gregoreaebc752008-11-06 23:29:22 +00007732/// CreateBuiltinBinOp - Creates a new built-in binary operation with
7733/// operator @p Opc at location @c TokLoc. This routine only supports
7734/// built-in operations; ActOnBinOp handles overloaded operators.
John McCall60d7b3a2010-08-24 06:29:42 +00007735ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc,
Argyrios Kyrtzidisb1fa3dc2011-01-05 20:09:36 +00007736 BinaryOperatorKind Opc,
Richard Trieu78ea78b2011-09-07 01:49:20 +00007737 Expr *LHSExpr, Expr *RHSExpr) {
7738 ExprResult LHS = Owned(LHSExpr), RHS = Owned(RHSExpr);
Eli Friedmanab3a8522009-03-28 01:22:36 +00007739 QualType ResultTy; // Result type of the binary operator.
Eli Friedmanab3a8522009-03-28 01:22:36 +00007740 // The following two variables are used for compound assignment operators
7741 QualType CompLHSTy; // Type of LHS after promotions for computation
7742 QualType CompResultTy; // Type of computation result
John McCallf89e55a2010-11-18 06:31:45 +00007743 ExprValueKind VK = VK_RValue;
7744 ExprObjectKind OK = OK_Ordinary;
Douglas Gregoreaebc752008-11-06 23:29:22 +00007745
7746 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00007747 case BO_Assign:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007748 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, QualType());
John McCallf6a16482010-12-04 03:47:34 +00007749 if (getLangOptions().CPlusPlus &&
Richard Trieu78ea78b2011-09-07 01:49:20 +00007750 LHS.get()->getObjectKind() != OK_ObjCProperty) {
7751 VK = LHS.get()->getValueKind();
7752 OK = LHS.get()->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00007753 }
Chandler Carruth9f7a6ee2011-01-04 06:52:15 +00007754 if (!ResultTy.isNull())
Richard Trieu78ea78b2011-09-07 01:49:20 +00007755 DiagnoseSelfAssignment(*this, LHS.get(), RHS.get(), OpLoc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007756 break;
John McCall2de56d12010-08-25 11:45:40 +00007757 case BO_PtrMemD:
7758 case BO_PtrMemI:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007759 ResultTy = CheckPointerToMemberOperands(LHS, RHS, VK, OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00007760 Opc == BO_PtrMemI);
Sebastian Redl22460502009-02-07 00:15:38 +00007761 break;
John McCall2de56d12010-08-25 11:45:40 +00007762 case BO_Mul:
7763 case BO_Div:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007764 ResultTy = CheckMultiplyDivideOperands(LHS, RHS, OpLoc, false,
John McCall2de56d12010-08-25 11:45:40 +00007765 Opc == BO_Div);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007766 break;
John McCall2de56d12010-08-25 11:45:40 +00007767 case BO_Rem:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007768 ResultTy = CheckRemainderOperands(LHS, RHS, OpLoc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007769 break;
John McCall2de56d12010-08-25 11:45:40 +00007770 case BO_Add:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007771 ResultTy = CheckAdditionOperands(LHS, RHS, OpLoc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007772 break;
John McCall2de56d12010-08-25 11:45:40 +00007773 case BO_Sub:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007774 ResultTy = CheckSubtractionOperands(LHS, RHS, OpLoc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007775 break;
John McCall2de56d12010-08-25 11:45:40 +00007776 case BO_Shl:
7777 case BO_Shr:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007778 ResultTy = CheckShiftOperands(LHS, RHS, OpLoc, Opc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007779 break;
John McCall2de56d12010-08-25 11:45:40 +00007780 case BO_LE:
7781 case BO_LT:
7782 case BO_GE:
7783 case BO_GT:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007784 ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc, true);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007785 break;
John McCall2de56d12010-08-25 11:45:40 +00007786 case BO_EQ:
7787 case BO_NE:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007788 ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc, false);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007789 break;
John McCall2de56d12010-08-25 11:45:40 +00007790 case BO_And:
7791 case BO_Xor:
7792 case BO_Or:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007793 ResultTy = CheckBitwiseOperands(LHS, RHS, OpLoc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007794 break;
John McCall2de56d12010-08-25 11:45:40 +00007795 case BO_LAnd:
7796 case BO_LOr:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007797 ResultTy = CheckLogicalOperands(LHS, RHS, OpLoc, Opc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007798 break;
John McCall2de56d12010-08-25 11:45:40 +00007799 case BO_MulAssign:
7800 case BO_DivAssign:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007801 CompResultTy = CheckMultiplyDivideOperands(LHS, RHS, OpLoc, true,
John McCallf89e55a2010-11-18 06:31:45 +00007802 Opc == BO_DivAssign);
Eli Friedmanab3a8522009-03-28 01:22:36 +00007803 CompLHSTy = CompResultTy;
Richard Trieu78ea78b2011-09-07 01:49:20 +00007804 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
7805 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007806 break;
John McCall2de56d12010-08-25 11:45:40 +00007807 case BO_RemAssign:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007808 CompResultTy = CheckRemainderOperands(LHS, RHS, OpLoc, true);
Eli Friedmanab3a8522009-03-28 01:22:36 +00007809 CompLHSTy = CompResultTy;
Richard Trieu78ea78b2011-09-07 01:49:20 +00007810 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
7811 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007812 break;
John McCall2de56d12010-08-25 11:45:40 +00007813 case BO_AddAssign:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007814 CompResultTy = CheckAdditionOperands(LHS, RHS, OpLoc, &CompLHSTy);
7815 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
7816 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007817 break;
John McCall2de56d12010-08-25 11:45:40 +00007818 case BO_SubAssign:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007819 CompResultTy = CheckSubtractionOperands(LHS, RHS, OpLoc, &CompLHSTy);
7820 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
7821 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007822 break;
John McCall2de56d12010-08-25 11:45:40 +00007823 case BO_ShlAssign:
7824 case BO_ShrAssign:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007825 CompResultTy = CheckShiftOperands(LHS, RHS, OpLoc, Opc, true);
Eli Friedmanab3a8522009-03-28 01:22:36 +00007826 CompLHSTy = CompResultTy;
Richard Trieu78ea78b2011-09-07 01:49:20 +00007827 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
7828 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007829 break;
John McCall2de56d12010-08-25 11:45:40 +00007830 case BO_AndAssign:
7831 case BO_XorAssign:
7832 case BO_OrAssign:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007833 CompResultTy = CheckBitwiseOperands(LHS, RHS, OpLoc, true);
Eli Friedmanab3a8522009-03-28 01:22:36 +00007834 CompLHSTy = CompResultTy;
Richard Trieu78ea78b2011-09-07 01:49:20 +00007835 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
7836 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007837 break;
John McCall2de56d12010-08-25 11:45:40 +00007838 case BO_Comma:
Richard Trieu78ea78b2011-09-07 01:49:20 +00007839 ResultTy = CheckCommaOperands(*this, LHS, RHS, OpLoc);
7840 if (getLangOptions().CPlusPlus && !RHS.isInvalid()) {
7841 VK = RHS.get()->getValueKind();
7842 OK = RHS.get()->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00007843 }
Douglas Gregoreaebc752008-11-06 23:29:22 +00007844 break;
7845 }
Richard Trieu78ea78b2011-09-07 01:49:20 +00007846 if (ResultTy.isNull() || LHS.isInvalid() || RHS.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00007847 return ExprError();
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00007848
7849 // Check for array bounds violations for both sides of the BinaryOperator
Richard Trieu78ea78b2011-09-07 01:49:20 +00007850 CheckArrayAccess(LHS.get());
7851 CheckArrayAccess(RHS.get());
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00007852
Eli Friedmanab3a8522009-03-28 01:22:36 +00007853 if (CompResultTy.isNull())
Richard Trieu78ea78b2011-09-07 01:49:20 +00007854 return Owned(new (Context) BinaryOperator(LHS.take(), RHS.take(), Opc,
John Wiegley429bb272011-04-08 18:41:53 +00007855 ResultTy, VK, OK, OpLoc));
Richard Trieu78ea78b2011-09-07 01:49:20 +00007856 if (getLangOptions().CPlusPlus && LHS.get()->getObjectKind() !=
Richard Trieu67e29332011-08-02 04:35:43 +00007857 OK_ObjCProperty) {
John McCallf89e55a2010-11-18 06:31:45 +00007858 VK = VK_LValue;
Richard Trieu78ea78b2011-09-07 01:49:20 +00007859 OK = LHS.get()->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00007860 }
Richard Trieu78ea78b2011-09-07 01:49:20 +00007861 return Owned(new (Context) CompoundAssignOperator(LHS.take(), RHS.take(), Opc,
John Wiegley429bb272011-04-08 18:41:53 +00007862 ResultTy, VK, OK, CompLHSTy,
John McCallf89e55a2010-11-18 06:31:45 +00007863 CompResultTy, OpLoc));
Douglas Gregoreaebc752008-11-06 23:29:22 +00007864}
7865
Sebastian Redlaee3c932009-10-27 12:10:02 +00007866/// DiagnoseBitwisePrecedence - Emit a warning when bitwise and comparison
7867/// operators are mixed in a way that suggests that the programmer forgot that
7868/// comparison operators have higher precedence. The most typical example of
7869/// such code is "flags & 0x0020 != 0", which is equivalent to "flags & 1".
John McCall2de56d12010-08-25 11:45:40 +00007870static void DiagnoseBitwisePrecedence(Sema &Self, BinaryOperatorKind Opc,
Richard Trieu78ea78b2011-09-07 01:49:20 +00007871 SourceLocation OpLoc, Expr *LHSExpr,
7872 Expr *RHSExpr) {
Sebastian Redlaee3c932009-10-27 12:10:02 +00007873 typedef BinaryOperator BinOp;
Richard Trieu78ea78b2011-09-07 01:49:20 +00007874 BinOp::Opcode LHSopc = static_cast<BinOp::Opcode>(-1),
7875 RHSopc = static_cast<BinOp::Opcode>(-1);
7876 if (BinOp *BO = dyn_cast<BinOp>(LHSExpr))
7877 LHSopc = BO->getOpcode();
7878 if (BinOp *BO = dyn_cast<BinOp>(RHSExpr))
7879 RHSopc = BO->getOpcode();
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007880
7881 // Subs are not binary operators.
Richard Trieu78ea78b2011-09-07 01:49:20 +00007882 if (LHSopc == -1 && RHSopc == -1)
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007883 return;
7884
7885 // Bitwise operations are sometimes used as eager logical ops.
7886 // Don't diagnose this.
Richard Trieu78ea78b2011-09-07 01:49:20 +00007887 if ((BinOp::isComparisonOp(LHSopc) || BinOp::isBitwiseOp(LHSopc)) &&
7888 (BinOp::isComparisonOp(RHSopc) || BinOp::isBitwiseOp(RHSopc)))
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007889 return;
7890
Richard Trieu78ea78b2011-09-07 01:49:20 +00007891 bool isLeftComp = BinOp::isComparisonOp(LHSopc);
7892 bool isRightComp = BinOp::isComparisonOp(RHSopc);
Richard Trieu70979d42011-08-10 22:41:34 +00007893 if (!isLeftComp && !isRightComp) return;
7894
Richard Trieu78ea78b2011-09-07 01:49:20 +00007895 SourceRange DiagRange = isLeftComp ? SourceRange(LHSExpr->getLocStart(),
7896 OpLoc)
7897 : SourceRange(OpLoc, RHSExpr->getLocEnd());
7898 std::string OpStr = isLeftComp ? BinOp::getOpcodeStr(LHSopc)
7899 : BinOp::getOpcodeStr(RHSopc);
Richard Trieu70979d42011-08-10 22:41:34 +00007900 SourceRange ParensRange = isLeftComp ?
Richard Trieu78ea78b2011-09-07 01:49:20 +00007901 SourceRange(cast<BinOp>(LHSExpr)->getRHS()->getLocStart(),
7902 RHSExpr->getLocEnd())
7903 : SourceRange(LHSExpr->getLocStart(),
7904 cast<BinOp>(RHSExpr)->getLHS()->getLocStart());
Richard Trieu70979d42011-08-10 22:41:34 +00007905
7906 Self.Diag(OpLoc, diag::warn_precedence_bitwise_rel)
7907 << DiagRange << BinOp::getOpcodeStr(Opc) << OpStr;
7908 SuggestParentheses(Self, OpLoc,
7909 Self.PDiag(diag::note_precedence_bitwise_silence) << OpStr,
Richard Trieu78ea78b2011-09-07 01:49:20 +00007910 RHSExpr->getSourceRange());
Richard Trieu70979d42011-08-10 22:41:34 +00007911 SuggestParentheses(Self, OpLoc,
7912 Self.PDiag(diag::note_precedence_bitwise_first) << BinOp::getOpcodeStr(Opc),
7913 ParensRange);
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007914}
7915
Argyrios Kyrtzidis33f46e22011-06-20 18:41:26 +00007916/// \brief It accepts a '&' expr that is inside a '|' one.
7917/// Emit a diagnostic together with a fixit hint that wraps the '&' expression
7918/// in parentheses.
7919static void
7920EmitDiagnosticForBitwiseAndInBitwiseOr(Sema &Self, SourceLocation OpLoc,
7921 BinaryOperator *Bop) {
7922 assert(Bop->getOpcode() == BO_And);
7923 Self.Diag(Bop->getOperatorLoc(), diag::warn_bitwise_and_in_bitwise_or)
7924 << Bop->getSourceRange() << OpLoc;
7925 SuggestParentheses(Self, Bop->getOperatorLoc(),
7926 Self.PDiag(diag::note_bitwise_and_in_bitwise_or_silence),
7927 Bop->getSourceRange());
7928}
7929
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007930/// \brief It accepts a '&&' expr that is inside a '||' one.
7931/// Emit a diagnostic together with a fixit hint that wraps the '&&' expression
7932/// in parentheses.
7933static void
7934EmitDiagnosticForLogicalAndInLogicalOr(Sema &Self, SourceLocation OpLoc,
Argyrios Kyrtzidisa61aedc2011-04-22 19:16:27 +00007935 BinaryOperator *Bop) {
7936 assert(Bop->getOpcode() == BO_LAnd);
Chandler Carruthf0b60d62011-06-16 01:05:14 +00007937 Self.Diag(Bop->getOperatorLoc(), diag::warn_logical_and_in_logical_or)
7938 << Bop->getSourceRange() << OpLoc;
Argyrios Kyrtzidisa61aedc2011-04-22 19:16:27 +00007939 SuggestParentheses(Self, Bop->getOperatorLoc(),
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007940 Self.PDiag(diag::note_logical_and_in_logical_or_silence),
Chandler Carruthf0b60d62011-06-16 01:05:14 +00007941 Bop->getSourceRange());
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007942}
7943
7944/// \brief Returns true if the given expression can be evaluated as a constant
7945/// 'true'.
7946static bool EvaluatesAsTrue(Sema &S, Expr *E) {
7947 bool Res;
7948 return E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && Res;
7949}
7950
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007951/// \brief Returns true if the given expression can be evaluated as a constant
7952/// 'false'.
7953static bool EvaluatesAsFalse(Sema &S, Expr *E) {
7954 bool Res;
7955 return E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && !Res;
7956}
7957
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007958/// \brief Look for '&&' in the left hand of a '||' expr.
7959static void DiagnoseLogicalAndInLogicalOrLHS(Sema &S, SourceLocation OpLoc,
Richard Trieubefece12011-09-07 02:02:10 +00007960 Expr *LHSExpr, Expr *RHSExpr) {
7961 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(LHSExpr)) {
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007962 if (Bop->getOpcode() == BO_LAnd) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007963 // If it's "a && b || 0" don't warn since the precedence doesn't matter.
Richard Trieubefece12011-09-07 02:02:10 +00007964 if (EvaluatesAsFalse(S, RHSExpr))
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007965 return;
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007966 // If it's "1 && a || b" don't warn since the precedence doesn't matter.
7967 if (!EvaluatesAsTrue(S, Bop->getLHS()))
7968 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
7969 } else if (Bop->getOpcode() == BO_LOr) {
7970 if (BinaryOperator *RBop = dyn_cast<BinaryOperator>(Bop->getRHS())) {
7971 // If it's "a || b && 1 || c" we didn't warn earlier for
7972 // "a || b && 1", but warn now.
7973 if (RBop->getOpcode() == BO_LAnd && EvaluatesAsTrue(S, RBop->getRHS()))
7974 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, RBop);
7975 }
7976 }
7977 }
7978}
7979
7980/// \brief Look for '&&' in the right hand of a '||' expr.
7981static void DiagnoseLogicalAndInLogicalOrRHS(Sema &S, SourceLocation OpLoc,
Richard Trieubefece12011-09-07 02:02:10 +00007982 Expr *LHSExpr, Expr *RHSExpr) {
7983 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(RHSExpr)) {
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007984 if (Bop->getOpcode() == BO_LAnd) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007985 // If it's "0 || a && b" don't warn since the precedence doesn't matter.
Richard Trieubefece12011-09-07 02:02:10 +00007986 if (EvaluatesAsFalse(S, LHSExpr))
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007987 return;
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007988 // If it's "a || b && 1" don't warn since the precedence doesn't matter.
7989 if (!EvaluatesAsTrue(S, Bop->getRHS()))
7990 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007991 }
7992 }
7993}
7994
Argyrios Kyrtzidis33f46e22011-06-20 18:41:26 +00007995/// \brief Look for '&' in the left or right hand of a '|' expr.
7996static void DiagnoseBitwiseAndInBitwiseOr(Sema &S, SourceLocation OpLoc,
7997 Expr *OrArg) {
7998 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(OrArg)) {
7999 if (Bop->getOpcode() == BO_And)
8000 return EmitDiagnosticForBitwiseAndInBitwiseOr(S, OpLoc, Bop);
8001 }
8002}
8003
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00008004/// DiagnoseBinOpPrecedence - Emit warnings for expressions with tricky
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00008005/// precedence.
John McCall2de56d12010-08-25 11:45:40 +00008006static void DiagnoseBinOpPrecedence(Sema &Self, BinaryOperatorKind Opc,
Richard Trieubefece12011-09-07 02:02:10 +00008007 SourceLocation OpLoc, Expr *LHSExpr,
8008 Expr *RHSExpr){
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00008009 // Diagnose "arg1 'bitwise' arg2 'eq' arg3".
Sebastian Redlaee3c932009-10-27 12:10:02 +00008010 if (BinaryOperator::isBitwiseOp(Opc))
Richard Trieubefece12011-09-07 02:02:10 +00008011 DiagnoseBitwisePrecedence(Self, Opc, OpLoc, LHSExpr, RHSExpr);
Argyrios Kyrtzidis33f46e22011-06-20 18:41:26 +00008012
8013 // Diagnose "arg1 & arg2 | arg3"
8014 if (Opc == BO_Or && !OpLoc.isMacroID()/* Don't warn in macros. */) {
Richard Trieubefece12011-09-07 02:02:10 +00008015 DiagnoseBitwiseAndInBitwiseOr(Self, OpLoc, LHSExpr);
8016 DiagnoseBitwiseAndInBitwiseOr(Self, OpLoc, RHSExpr);
Argyrios Kyrtzidis33f46e22011-06-20 18:41:26 +00008017 }
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00008018
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00008019 // Warn about arg1 || arg2 && arg3, as GCC 4.3+ does.
8020 // We don't warn for 'assert(a || b && "bad")' since this is safe.
Argyrios Kyrtzidisd92ccaa2010-11-17 18:54:22 +00008021 if (Opc == BO_LOr && !OpLoc.isMacroID()/* Don't warn in macros. */) {
Richard Trieubefece12011-09-07 02:02:10 +00008022 DiagnoseLogicalAndInLogicalOrLHS(Self, OpLoc, LHSExpr, RHSExpr);
8023 DiagnoseLogicalAndInLogicalOrRHS(Self, OpLoc, LHSExpr, RHSExpr);
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00008024 }
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00008025}
8026
Reid Spencer5f016e22007-07-11 17:01:13 +00008027// Binary Operators. 'Tok' is the token for the operator.
John McCall60d7b3a2010-08-24 06:29:42 +00008028ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc,
John McCall2de56d12010-08-25 11:45:40 +00008029 tok::TokenKind Kind,
Richard Trieubefece12011-09-07 02:02:10 +00008030 Expr *LHSExpr, Expr *RHSExpr) {
John McCall2de56d12010-08-25 11:45:40 +00008031 BinaryOperatorKind Opc = ConvertTokenKindToBinaryOpcode(Kind);
Richard Trieubefece12011-09-07 02:02:10 +00008032 assert((LHSExpr != 0) && "ActOnBinOp(): missing left expression");
8033 assert((RHSExpr != 0) && "ActOnBinOp(): missing right expression");
Reid Spencer5f016e22007-07-11 17:01:13 +00008034
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00008035 // Emit warnings for tricky precedence issues, e.g. "bitfield & 0x4 == 0"
Richard Trieubefece12011-09-07 02:02:10 +00008036 DiagnoseBinOpPrecedence(*this, Opc, TokLoc, LHSExpr, RHSExpr);
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00008037
Richard Trieubefece12011-09-07 02:02:10 +00008038 return BuildBinOp(S, TokLoc, Opc, LHSExpr, RHSExpr);
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00008039}
8040
John McCall3c3b7f92011-10-25 17:37:35 +00008041/// Build an overloaded binary operator expression in the given scope.
8042static ExprResult BuildOverloadedBinOp(Sema &S, Scope *Sc, SourceLocation OpLoc,
8043 BinaryOperatorKind Opc,
8044 Expr *LHS, Expr *RHS) {
8045 // Find all of the overloaded operators visible from this
8046 // point. We perform both an operator-name lookup from the local
8047 // scope and an argument-dependent lookup based on the types of
8048 // the arguments.
8049 UnresolvedSet<16> Functions;
8050 OverloadedOperatorKind OverOp
8051 = BinaryOperator::getOverloadedOperator(Opc);
8052 if (Sc && OverOp != OO_None)
8053 S.LookupOverloadedOperatorName(OverOp, Sc, LHS->getType(),
8054 RHS->getType(), Functions);
8055
8056 // Build the (potentially-overloaded, potentially-dependent)
8057 // binary operation.
8058 return S.CreateOverloadedBinOp(OpLoc, Opc, Functions, LHS, RHS);
8059}
8060
John McCall60d7b3a2010-08-24 06:29:42 +00008061ExprResult Sema::BuildBinOp(Scope *S, SourceLocation OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00008062 BinaryOperatorKind Opc,
Richard Trieubefece12011-09-07 02:02:10 +00008063 Expr *LHSExpr, Expr *RHSExpr) {
John McCallac516502011-10-28 01:04:34 +00008064 // We want to end up calling one of checkPseudoObjectAssignment
8065 // (if the LHS is a pseudo-object), BuildOverloadedBinOp (if
8066 // both expressions are overloadable or either is type-dependent),
8067 // or CreateBuiltinBinOp (in any other case). We also want to get
8068 // any placeholder types out of the way.
8069
John McCall3c3b7f92011-10-25 17:37:35 +00008070 // Handle pseudo-objects in the LHS.
8071 if (const BuiltinType *pty = LHSExpr->getType()->getAsPlaceholderType()) {
8072 // Assignments with a pseudo-object l-value need special analysis.
8073 if (pty->getKind() == BuiltinType::PseudoObject &&
8074 BinaryOperator::isAssignmentOp(Opc))
8075 return checkPseudoObjectAssignment(S, OpLoc, Opc, LHSExpr, RHSExpr);
8076
8077 // Don't resolve overloads if the other type is overloadable.
8078 if (pty->getKind() == BuiltinType::Overload) {
8079 // We can't actually test that if we still have a placeholder,
8080 // though. Fortunately, none of the exceptions we see in that
John McCallac516502011-10-28 01:04:34 +00008081 // code below are valid when the LHS is an overload set. Note
8082 // that an overload set can be dependently-typed, but it never
8083 // instantiates to having an overloadable type.
John McCall3c3b7f92011-10-25 17:37:35 +00008084 ExprResult resolvedRHS = CheckPlaceholderExpr(RHSExpr);
8085 if (resolvedRHS.isInvalid()) return ExprError();
8086 RHSExpr = resolvedRHS.take();
8087
John McCallac516502011-10-28 01:04:34 +00008088 if (RHSExpr->isTypeDependent() ||
8089 RHSExpr->getType()->isOverloadableType())
John McCall3c3b7f92011-10-25 17:37:35 +00008090 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
8091 }
8092
8093 ExprResult LHS = CheckPlaceholderExpr(LHSExpr);
8094 if (LHS.isInvalid()) return ExprError();
8095 LHSExpr = LHS.take();
8096 }
8097
8098 // Handle pseudo-objects in the RHS.
8099 if (const BuiltinType *pty = RHSExpr->getType()->getAsPlaceholderType()) {
8100 // An overload in the RHS can potentially be resolved by the type
8101 // being assigned to.
John McCallac516502011-10-28 01:04:34 +00008102 if (Opc == BO_Assign && pty->getKind() == BuiltinType::Overload) {
8103 if (LHSExpr->isTypeDependent() || RHSExpr->isTypeDependent())
8104 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
8105
John McCall3c3b7f92011-10-25 17:37:35 +00008106 return CreateBuiltinBinOp(OpLoc, Opc, LHSExpr, RHSExpr);
John McCallac516502011-10-28 01:04:34 +00008107 }
John McCall3c3b7f92011-10-25 17:37:35 +00008108
8109 // Don't resolve overloads if the other type is overloadable.
8110 if (pty->getKind() == BuiltinType::Overload &&
8111 LHSExpr->getType()->isOverloadableType())
8112 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
8113
8114 ExprResult resolvedRHS = CheckPlaceholderExpr(RHSExpr);
8115 if (!resolvedRHS.isUsable()) return ExprError();
8116 RHSExpr = resolvedRHS.take();
8117 }
8118
John McCall01b2e4e2010-12-06 05:26:58 +00008119 if (getLangOptions().CPlusPlus) {
John McCallac516502011-10-28 01:04:34 +00008120 // If either expression is type-dependent, always build an
8121 // overloaded op.
8122 if (LHSExpr->isTypeDependent() || RHSExpr->isTypeDependent())
8123 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008124
John McCallac516502011-10-28 01:04:34 +00008125 // Otherwise, build an overloaded op if either expression has an
8126 // overloadable type.
8127 if (LHSExpr->getType()->isOverloadableType() ||
8128 RHSExpr->getType()->isOverloadableType())
John McCall3c3b7f92011-10-25 17:37:35 +00008129 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00008130 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008131
Douglas Gregoreaebc752008-11-06 23:29:22 +00008132 // Build a built-in binary operation.
Richard Trieubefece12011-09-07 02:02:10 +00008133 return CreateBuiltinBinOp(OpLoc, Opc, LHSExpr, RHSExpr);
Reid Spencer5f016e22007-07-11 17:01:13 +00008134}
8135
John McCall60d7b3a2010-08-24 06:29:42 +00008136ExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
Argyrios Kyrtzidisb1fa3dc2011-01-05 20:09:36 +00008137 UnaryOperatorKind Opc,
John Wiegley429bb272011-04-08 18:41:53 +00008138 Expr *InputExpr) {
8139 ExprResult Input = Owned(InputExpr);
John McCallf89e55a2010-11-18 06:31:45 +00008140 ExprValueKind VK = VK_RValue;
8141 ExprObjectKind OK = OK_Ordinary;
Reid Spencer5f016e22007-07-11 17:01:13 +00008142 QualType resultType;
8143 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00008144 case UO_PreInc:
8145 case UO_PreDec:
8146 case UO_PostInc:
8147 case UO_PostDec:
John Wiegley429bb272011-04-08 18:41:53 +00008148 resultType = CheckIncrementDecrementOperand(*this, Input.get(), VK, OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00008149 Opc == UO_PreInc ||
8150 Opc == UO_PostInc,
8151 Opc == UO_PreInc ||
8152 Opc == UO_PreDec);
Reid Spencer5f016e22007-07-11 17:01:13 +00008153 break;
John McCall2de56d12010-08-25 11:45:40 +00008154 case UO_AddrOf:
John McCall3c3b7f92011-10-25 17:37:35 +00008155 resultType = CheckAddressOfOperand(*this, Input, OpLoc);
Reid Spencer5f016e22007-07-11 17:01:13 +00008156 break;
John McCall1de4d4e2011-04-07 08:22:57 +00008157 case UO_Deref: {
John Wiegley429bb272011-04-08 18:41:53 +00008158 Input = DefaultFunctionArrayLvalueConversion(Input.take());
8159 resultType = CheckIndirectionOperand(*this, Input.get(), VK, OpLoc);
Reid Spencer5f016e22007-07-11 17:01:13 +00008160 break;
John McCall1de4d4e2011-04-07 08:22:57 +00008161 }
John McCall2de56d12010-08-25 11:45:40 +00008162 case UO_Plus:
8163 case UO_Minus:
John Wiegley429bb272011-04-08 18:41:53 +00008164 Input = UsualUnaryConversions(Input.take());
8165 if (Input.isInvalid()) return ExprError();
8166 resultType = Input.get()->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00008167 if (resultType->isDependentType())
8168 break;
Douglas Gregor00619622010-06-22 23:41:02 +00008169 if (resultType->isArithmeticType() || // C99 6.5.3.3p1
8170 resultType->isVectorType())
Douglas Gregor74253732008-11-19 15:42:04 +00008171 break;
8172 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7
8173 resultType->isEnumeralType())
8174 break;
8175 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6
John McCall2de56d12010-08-25 11:45:40 +00008176 Opc == UO_Plus &&
Douglas Gregor74253732008-11-19 15:42:04 +00008177 resultType->isPointerType())
8178 break;
8179
Sebastian Redl0eb23302009-01-19 00:08:26 +00008180 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley429bb272011-04-08 18:41:53 +00008181 << resultType << Input.get()->getSourceRange());
8182
John McCall2de56d12010-08-25 11:45:40 +00008183 case UO_Not: // bitwise complement
John Wiegley429bb272011-04-08 18:41:53 +00008184 Input = UsualUnaryConversions(Input.take());
8185 if (Input.isInvalid()) return ExprError();
8186 resultType = Input.get()->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00008187 if (resultType->isDependentType())
8188 break;
Chris Lattner02a65142008-07-25 23:52:49 +00008189 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension.
8190 if (resultType->isComplexType() || resultType->isComplexIntegerType())
8191 // C99 does not support '~' for complex conjugation.
Chris Lattnerd3a94e22008-11-20 06:06:08 +00008192 Diag(OpLoc, diag::ext_integer_complement_complex)
John Wiegley429bb272011-04-08 18:41:53 +00008193 << resultType << Input.get()->getSourceRange();
John McCall2cd11fe2010-10-12 02:09:17 +00008194 else if (resultType->hasIntegerRepresentation())
8195 break;
John McCall3c3b7f92011-10-25 17:37:35 +00008196 else {
Sebastian Redl0eb23302009-01-19 00:08:26 +00008197 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley429bb272011-04-08 18:41:53 +00008198 << resultType << Input.get()->getSourceRange());
John McCall2cd11fe2010-10-12 02:09:17 +00008199 }
Reid Spencer5f016e22007-07-11 17:01:13 +00008200 break;
John Wiegley429bb272011-04-08 18:41:53 +00008201
John McCall2de56d12010-08-25 11:45:40 +00008202 case UO_LNot: // logical negation
Reid Spencer5f016e22007-07-11 17:01:13 +00008203 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5).
John Wiegley429bb272011-04-08 18:41:53 +00008204 Input = DefaultFunctionArrayLvalueConversion(Input.take());
8205 if (Input.isInvalid()) return ExprError();
8206 resultType = Input.get()->getType();
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +00008207
8208 // Though we still have to promote half FP to float...
8209 if (resultType->isHalfType()) {
8210 Input = ImpCastExprToType(Input.take(), Context.FloatTy, CK_FloatingCast).take();
8211 resultType = Context.FloatTy;
8212 }
8213
Sebastian Redl28507842009-02-26 14:39:58 +00008214 if (resultType->isDependentType())
8215 break;
Abramo Bagnara737d5442011-04-07 09:26:19 +00008216 if (resultType->isScalarType()) {
8217 // C99 6.5.3.3p1: ok, fallthrough;
8218 if (Context.getLangOptions().CPlusPlus) {
8219 // C++03 [expr.unary.op]p8, C++0x [expr.unary.op]p9:
8220 // operand contextually converted to bool.
John Wiegley429bb272011-04-08 18:41:53 +00008221 Input = ImpCastExprToType(Input.take(), Context.BoolTy,
8222 ScalarTypeToBooleanCastKind(resultType));
Abramo Bagnara737d5442011-04-07 09:26:19 +00008223 }
John McCall2cd11fe2010-10-12 02:09:17 +00008224 } else {
Sebastian Redl0eb23302009-01-19 00:08:26 +00008225 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
John Wiegley429bb272011-04-08 18:41:53 +00008226 << resultType << Input.get()->getSourceRange());
John McCall2cd11fe2010-10-12 02:09:17 +00008227 }
Douglas Gregorea844f32010-09-20 17:13:33 +00008228
Reid Spencer5f016e22007-07-11 17:01:13 +00008229 // LNot always has type int. C99 6.5.3.3p5.
Sebastian Redl0eb23302009-01-19 00:08:26 +00008230 // In C++, it's bool. C++ 5.3.1p8
Argyrios Kyrtzidis16f744b2011-02-18 20:55:15 +00008231 resultType = Context.getLogicalOperationType();
Reid Spencer5f016e22007-07-11 17:01:13 +00008232 break;
John McCall2de56d12010-08-25 11:45:40 +00008233 case UO_Real:
8234 case UO_Imag:
John McCall09431682010-11-18 19:01:18 +00008235 resultType = CheckRealImagOperand(*this, Input, OpLoc, Opc == UO_Real);
John McCallf89e55a2010-11-18 06:31:45 +00008236 // _Real and _Imag map ordinary l-values into ordinary l-values.
John Wiegley429bb272011-04-08 18:41:53 +00008237 if (Input.isInvalid()) return ExprError();
8238 if (Input.get()->getValueKind() != VK_RValue &&
8239 Input.get()->getObjectKind() == OK_Ordinary)
8240 VK = Input.get()->getValueKind();
Chris Lattnerdbb36972007-08-24 21:16:53 +00008241 break;
John McCall2de56d12010-08-25 11:45:40 +00008242 case UO_Extension:
John Wiegley429bb272011-04-08 18:41:53 +00008243 resultType = Input.get()->getType();
8244 VK = Input.get()->getValueKind();
8245 OK = Input.get()->getObjectKind();
Reid Spencer5f016e22007-07-11 17:01:13 +00008246 break;
8247 }
John Wiegley429bb272011-04-08 18:41:53 +00008248 if (resultType.isNull() || Input.isInvalid())
Sebastian Redl0eb23302009-01-19 00:08:26 +00008249 return ExprError();
Douglas Gregorbc736fc2009-03-13 23:49:33 +00008250
Kaelyn Uhraind6c88652011-08-05 23:18:04 +00008251 // Check for array bounds violations in the operand of the UnaryOperator,
8252 // except for the '*' and '&' operators that have to be handled specially
8253 // by CheckArrayAccess (as there are special cases like &array[arraysize]
8254 // that are explicitly defined as valid by the standard).
8255 if (Opc != UO_AddrOf && Opc != UO_Deref)
8256 CheckArrayAccess(Input.get());
8257
John Wiegley429bb272011-04-08 18:41:53 +00008258 return Owned(new (Context) UnaryOperator(Input.take(), Opc, resultType,
John McCallf89e55a2010-11-18 06:31:45 +00008259 VK, OK, OpLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00008260}
8261
Douglas Gregord3d08532011-12-14 21:23:13 +00008262/// \brief Determine whether the given expression is a qualified member
8263/// access expression, of a form that could be turned into a pointer to member
8264/// with the address-of operator.
8265static bool isQualifiedMemberAccess(Expr *E) {
8266 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
8267 if (!DRE->getQualifier())
8268 return false;
8269
8270 ValueDecl *VD = DRE->getDecl();
8271 if (!VD->isCXXClassMember())
8272 return false;
8273
8274 if (isa<FieldDecl>(VD) || isa<IndirectFieldDecl>(VD))
8275 return true;
8276 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(VD))
8277 return Method->isInstance();
8278
8279 return false;
8280 }
8281
8282 if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(E)) {
8283 if (!ULE->getQualifier())
8284 return false;
8285
8286 for (UnresolvedLookupExpr::decls_iterator D = ULE->decls_begin(),
8287 DEnd = ULE->decls_end();
8288 D != DEnd; ++D) {
8289 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(*D)) {
8290 if (Method->isInstance())
8291 return true;
8292 } else {
8293 // Overload set does not contain methods.
8294 break;
8295 }
8296 }
8297
8298 return false;
8299 }
8300
8301 return false;
8302}
8303
John McCall60d7b3a2010-08-24 06:29:42 +00008304ExprResult Sema::BuildUnaryOp(Scope *S, SourceLocation OpLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00008305 UnaryOperatorKind Opc, Expr *Input) {
John McCall3c3b7f92011-10-25 17:37:35 +00008306 // First things first: handle placeholders so that the
8307 // overloaded-operator check considers the right type.
8308 if (const BuiltinType *pty = Input->getType()->getAsPlaceholderType()) {
8309 // Increment and decrement of pseudo-object references.
8310 if (pty->getKind() == BuiltinType::PseudoObject &&
8311 UnaryOperator::isIncrementDecrementOp(Opc))
8312 return checkPseudoObjectIncDec(S, OpLoc, Opc, Input);
8313
8314 // extension is always a builtin operator.
8315 if (Opc == UO_Extension)
8316 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
8317
8318 // & gets special logic for several kinds of placeholder.
8319 // The builtin code knows what to do.
8320 if (Opc == UO_AddrOf &&
8321 (pty->getKind() == BuiltinType::Overload ||
8322 pty->getKind() == BuiltinType::UnknownAny ||
8323 pty->getKind() == BuiltinType::BoundMember))
8324 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
8325
8326 // Anything else needs to be handled now.
8327 ExprResult Result = CheckPlaceholderExpr(Input);
8328 if (Result.isInvalid()) return ExprError();
8329 Input = Result.take();
8330 }
8331
Anders Carlssona8a1e3d2009-11-14 21:26:41 +00008332 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType() &&
Douglas Gregord3d08532011-12-14 21:23:13 +00008333 UnaryOperator::getOverloadedOperator(Opc) != OO_None &&
8334 !(Opc == UO_AddrOf && isQualifiedMemberAccess(Input))) {
Douglas Gregorbc736fc2009-03-13 23:49:33 +00008335 // Find all of the overloaded operators visible from this
8336 // point. We perform both an operator-name lookup from the local
8337 // scope and an argument-dependent lookup based on the types of
8338 // the arguments.
John McCall6e266892010-01-26 03:27:55 +00008339 UnresolvedSet<16> Functions;
Douglas Gregorbc736fc2009-03-13 23:49:33 +00008340 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc);
John McCall6e266892010-01-26 03:27:55 +00008341 if (S && OverOp != OO_None)
8342 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(),
8343 Functions);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008344
John McCall9ae2f072010-08-23 23:25:46 +00008345 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, Input);
Douglas Gregorbc736fc2009-03-13 23:49:33 +00008346 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008347
John McCall9ae2f072010-08-23 23:25:46 +00008348 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
Douglas Gregorbc736fc2009-03-13 23:49:33 +00008349}
8350
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00008351// Unary Operators. 'Tok' is the token for the operator.
John McCall60d7b3a2010-08-24 06:29:42 +00008352ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
John McCallf4c73712011-01-19 06:33:43 +00008353 tok::TokenKind Op, Expr *Input) {
John McCall9ae2f072010-08-23 23:25:46 +00008354 return BuildUnaryOp(S, OpLoc, ConvertTokenKindToUnaryOpcode(Op), Input);
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00008355}
8356
Steve Naroff1b273c42007-09-16 14:56:35 +00008357/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
Chris Lattnerad8dcf42011-02-17 07:39:24 +00008358ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
Chris Lattner57ad3782011-02-17 20:34:02 +00008359 LabelDecl *TheDecl) {
Chris Lattnerad8dcf42011-02-17 07:39:24 +00008360 TheDecl->setUsed();
Reid Spencer5f016e22007-07-11 17:01:13 +00008361 // Create the AST node. The address of a label always has type 'void*'.
Chris Lattnerad8dcf42011-02-17 07:39:24 +00008362 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, TheDecl,
Sebastian Redlf53597f2009-03-15 17:47:39 +00008363 Context.getPointerType(Context.VoidTy)));
Reid Spencer5f016e22007-07-11 17:01:13 +00008364}
8365
John McCallf85e1932011-06-15 23:02:42 +00008366/// Given the last statement in a statement-expression, check whether
8367/// the result is a producing expression (like a call to an
8368/// ns_returns_retained function) and, if so, rebuild it to hoist the
8369/// release out of the full-expression. Otherwise, return null.
8370/// Cannot fail.
Richard Trieuccd891a2011-09-09 01:45:06 +00008371static Expr *maybeRebuildARCConsumingStmt(Stmt *Statement) {
John McCallf85e1932011-06-15 23:02:42 +00008372 // Should always be wrapped with one of these.
Richard Trieuccd891a2011-09-09 01:45:06 +00008373 ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(Statement);
John McCallf85e1932011-06-15 23:02:42 +00008374 if (!cleanups) return 0;
8375
8376 ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(cleanups->getSubExpr());
John McCall33e56f32011-09-10 06:18:15 +00008377 if (!cast || cast->getCastKind() != CK_ARCConsumeObject)
John McCallf85e1932011-06-15 23:02:42 +00008378 return 0;
8379
8380 // Splice out the cast. This shouldn't modify any interesting
8381 // features of the statement.
8382 Expr *producer = cast->getSubExpr();
8383 assert(producer->getType() == cast->getType());
8384 assert(producer->getValueKind() == cast->getValueKind());
8385 cleanups->setSubExpr(producer);
8386 return cleanups;
8387}
8388
John McCall60d7b3a2010-08-24 06:29:42 +00008389ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00008390Sema::ActOnStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
Sebastian Redlf53597f2009-03-15 17:47:39 +00008391 SourceLocation RPLoc) { // "({..})"
Chris Lattnerab18c4c2007-07-24 16:58:17 +00008392 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!");
8393 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt);
8394
Douglas Gregordd8f5692010-03-10 04:54:39 +00008395 bool isFileScope
8396 = (getCurFunctionOrMethodDecl() == 0) && (getCurBlock() == 0);
Chris Lattner4a049f02009-04-25 19:11:05 +00008397 if (isFileScope)
Sebastian Redlf53597f2009-03-15 17:47:39 +00008398 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope));
Eli Friedmandca2b732009-01-24 23:09:00 +00008399
Chris Lattnerab18c4c2007-07-24 16:58:17 +00008400 // FIXME: there are a variety of strange constraints to enforce here, for
8401 // example, it is not possible to goto into a stmt expression apparently.
8402 // More semantic analysis is needed.
Mike Stumpeed9cac2009-02-19 03:04:26 +00008403
Chris Lattnerab18c4c2007-07-24 16:58:17 +00008404 // If there are sub stmts in the compound stmt, take the type of the last one
8405 // as the type of the stmtexpr.
8406 QualType Ty = Context.VoidTy;
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008407 bool StmtExprMayBindToTemp = false;
Chris Lattner611b2ec2008-07-26 19:51:01 +00008408 if (!Compound->body_empty()) {
8409 Stmt *LastStmt = Compound->body_back();
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008410 LabelStmt *LastLabelStmt = 0;
Chris Lattner611b2ec2008-07-26 19:51:01 +00008411 // If LastStmt is a label, skip down through into the body.
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008412 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) {
8413 LastLabelStmt = Label;
Chris Lattner611b2ec2008-07-26 19:51:01 +00008414 LastStmt = Label->getSubStmt();
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008415 }
John McCallf85e1932011-06-15 23:02:42 +00008416
John Wiegley429bb272011-04-08 18:41:53 +00008417 if (Expr *LastE = dyn_cast<Expr>(LastStmt)) {
John McCallf6a16482010-12-04 03:47:34 +00008418 // Do function/array conversion on the last expression, but not
8419 // lvalue-to-rvalue. However, initialize an unqualified type.
John Wiegley429bb272011-04-08 18:41:53 +00008420 ExprResult LastExpr = DefaultFunctionArrayConversion(LastE);
8421 if (LastExpr.isInvalid())
8422 return ExprError();
8423 Ty = LastExpr.get()->getType().getUnqualifiedType();
John McCallf6a16482010-12-04 03:47:34 +00008424
John Wiegley429bb272011-04-08 18:41:53 +00008425 if (!Ty->isDependentType() && !LastExpr.get()->isTypeDependent()) {
John McCallf85e1932011-06-15 23:02:42 +00008426 // In ARC, if the final expression ends in a consume, splice
8427 // the consume out and bind it later. In the alternate case
8428 // (when dealing with a retainable type), the result
8429 // initialization will create a produce. In both cases the
8430 // result will be +1, and we'll need to balance that out with
8431 // a bind.
8432 if (Expr *rebuiltLastStmt
8433 = maybeRebuildARCConsumingStmt(LastExpr.get())) {
8434 LastExpr = rebuiltLastStmt;
8435 } else {
8436 LastExpr = PerformCopyInitialization(
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008437 InitializedEntity::InitializeResult(LPLoc,
8438 Ty,
8439 false),
8440 SourceLocation(),
John McCallf85e1932011-06-15 23:02:42 +00008441 LastExpr);
8442 }
8443
John Wiegley429bb272011-04-08 18:41:53 +00008444 if (LastExpr.isInvalid())
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008445 return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00008446 if (LastExpr.get() != 0) {
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008447 if (!LastLabelStmt)
John Wiegley429bb272011-04-08 18:41:53 +00008448 Compound->setLastStmt(LastExpr.take());
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008449 else
John Wiegley429bb272011-04-08 18:41:53 +00008450 LastLabelStmt->setSubStmt(LastExpr.take());
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008451 StmtExprMayBindToTemp = true;
8452 }
8453 }
8454 }
Chris Lattner611b2ec2008-07-26 19:51:01 +00008455 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008456
Eli Friedmanb1d796d2009-03-23 00:24:07 +00008457 // FIXME: Check that expression type is complete/non-abstract; statement
8458 // expressions are not lvalues.
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00008459 Expr *ResStmtExpr = new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc);
8460 if (StmtExprMayBindToTemp)
8461 return MaybeBindToTemporary(ResStmtExpr);
8462 return Owned(ResStmtExpr);
Chris Lattnerab18c4c2007-07-24 16:58:17 +00008463}
Steve Naroffd34e9152007-08-01 22:05:33 +00008464
John McCall60d7b3a2010-08-24 06:29:42 +00008465ExprResult Sema::BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
John McCall2cd11fe2010-10-12 02:09:17 +00008466 TypeSourceInfo *TInfo,
8467 OffsetOfComponent *CompPtr,
8468 unsigned NumComponents,
8469 SourceLocation RParenLoc) {
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008470 QualType ArgTy = TInfo->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00008471 bool Dependent = ArgTy->isDependentType();
Abramo Bagnarabd054db2010-05-20 10:00:11 +00008472 SourceRange TypeRange = TInfo->getTypeLoc().getLocalSourceRange();
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008473
Chris Lattner73d0d4f2007-08-30 17:45:32 +00008474 // We must have at least one component that refers to the type, and the first
8475 // one is known to be a field designator. Verify that the ArgTy represents
8476 // a struct/union/class.
Sebastian Redl28507842009-02-26 14:39:58 +00008477 if (!Dependent && !ArgTy->isRecordType())
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008478 return ExprError(Diag(BuiltinLoc, diag::err_offsetof_record_type)
8479 << ArgTy << TypeRange);
8480
8481 // Type must be complete per C99 7.17p3 because a declaring a variable
8482 // with an incomplete type would be ill-formed.
8483 if (!Dependent
8484 && RequireCompleteType(BuiltinLoc, ArgTy,
8485 PDiag(diag::err_offsetof_incomplete_type)
8486 << TypeRange))
8487 return ExprError();
8488
Chris Lattner9e2b75c2007-08-31 21:49:13 +00008489 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a
8490 // GCC extension, diagnose them.
Eli Friedman35183ac2009-02-27 06:44:11 +00008491 // FIXME: This diagnostic isn't actually visible because the location is in
8492 // a system header!
Chris Lattner9e2b75c2007-08-31 21:49:13 +00008493 if (NumComponents != 1)
Chris Lattnerdcd5ef12008-11-19 05:27:50 +00008494 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator)
8495 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd);
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008496
8497 bool DidWarnAboutNonPOD = false;
8498 QualType CurrentType = ArgTy;
8499 typedef OffsetOfExpr::OffsetOfNode OffsetOfNode;
Chris Lattner5f9e2722011-07-23 10:55:15 +00008500 SmallVector<OffsetOfNode, 4> Comps;
8501 SmallVector<Expr*, 4> Exprs;
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008502 for (unsigned i = 0; i != NumComponents; ++i) {
8503 const OffsetOfComponent &OC = CompPtr[i];
8504 if (OC.isBrackets) {
8505 // Offset of an array sub-field. TODO: Should we allow vector elements?
8506 if (!CurrentType->isDependentType()) {
8507 const ArrayType *AT = Context.getAsArrayType(CurrentType);
8508 if(!AT)
8509 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type)
8510 << CurrentType);
8511 CurrentType = AT->getElementType();
8512 } else
8513 CurrentType = Context.DependentTy;
8514
Richard Smithea011432011-10-17 23:29:39 +00008515 ExprResult IdxRval = DefaultLvalueConversion(static_cast<Expr*>(OC.U.E));
8516 if (IdxRval.isInvalid())
8517 return ExprError();
8518 Expr *Idx = IdxRval.take();
8519
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008520 // The expression must be an integral expression.
8521 // FIXME: An integral constant expression?
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008522 if (!Idx->isTypeDependent() && !Idx->isValueDependent() &&
8523 !Idx->getType()->isIntegerType())
8524 return ExprError(Diag(Idx->getLocStart(),
8525 diag::err_typecheck_subscript_not_integer)
8526 << Idx->getSourceRange());
Richard Smithd82e5d32011-10-17 05:48:07 +00008527
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008528 // Record this array index.
8529 Comps.push_back(OffsetOfNode(OC.LocStart, Exprs.size(), OC.LocEnd));
Richard Smithea011432011-10-17 23:29:39 +00008530 Exprs.push_back(Idx);
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008531 continue;
8532 }
8533
8534 // Offset of a field.
8535 if (CurrentType->isDependentType()) {
8536 // We have the offset of a field, but we can't look into the dependent
8537 // type. Just record the identifier of the field.
8538 Comps.push_back(OffsetOfNode(OC.LocStart, OC.U.IdentInfo, OC.LocEnd));
8539 CurrentType = Context.DependentTy;
8540 continue;
8541 }
8542
8543 // We need to have a complete type to look into.
8544 if (RequireCompleteType(OC.LocStart, CurrentType,
8545 diag::err_offsetof_incomplete_type))
8546 return ExprError();
8547
8548 // Look for the designated field.
8549 const RecordType *RC = CurrentType->getAs<RecordType>();
8550 if (!RC)
8551 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type)
8552 << CurrentType);
8553 RecordDecl *RD = RC->getDecl();
8554
8555 // C++ [lib.support.types]p5:
8556 // The macro offsetof accepts a restricted set of type arguments in this
8557 // International Standard. type shall be a POD structure or a POD union
8558 // (clause 9).
8559 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
8560 if (!CRD->isPOD() && !DidWarnAboutNonPOD &&
Ted Kremenek762696f2011-02-23 01:51:43 +00008561 DiagRuntimeBehavior(BuiltinLoc, 0,
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008562 PDiag(diag::warn_offsetof_non_pod_type)
8563 << SourceRange(CompPtr[0].LocStart, OC.LocEnd)
8564 << CurrentType))
8565 DidWarnAboutNonPOD = true;
8566 }
8567
8568 // Look for the field.
8569 LookupResult R(*this, OC.U.IdentInfo, OC.LocStart, LookupMemberName);
8570 LookupQualifiedName(R, RD);
8571 FieldDecl *MemberDecl = R.getAsSingle<FieldDecl>();
Francois Pichet87c2e122010-11-21 06:08:52 +00008572 IndirectFieldDecl *IndirectMemberDecl = 0;
8573 if (!MemberDecl) {
Benjamin Kramerd9811462010-11-21 14:11:41 +00008574 if ((IndirectMemberDecl = R.getAsSingle<IndirectFieldDecl>()))
Francois Pichet87c2e122010-11-21 06:08:52 +00008575 MemberDecl = IndirectMemberDecl->getAnonField();
8576 }
8577
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008578 if (!MemberDecl)
8579 return ExprError(Diag(BuiltinLoc, diag::err_no_member)
8580 << OC.U.IdentInfo << RD << SourceRange(OC.LocStart,
8581 OC.LocEnd));
8582
Douglas Gregor9d5d60f2010-04-28 22:36:06 +00008583 // C99 7.17p3:
8584 // (If the specified member is a bit-field, the behavior is undefined.)
8585 //
8586 // We diagnose this as an error.
Richard Smitha6b8b2c2011-10-10 18:28:20 +00008587 if (MemberDecl->isBitField()) {
Douglas Gregor9d5d60f2010-04-28 22:36:06 +00008588 Diag(OC.LocEnd, diag::err_offsetof_bitfield)
8589 << MemberDecl->getDeclName()
8590 << SourceRange(BuiltinLoc, RParenLoc);
8591 Diag(MemberDecl->getLocation(), diag::note_bitfield_decl);
8592 return ExprError();
8593 }
Eli Friedman19410a72010-08-05 10:11:36 +00008594
8595 RecordDecl *Parent = MemberDecl->getParent();
Francois Pichet87c2e122010-11-21 06:08:52 +00008596 if (IndirectMemberDecl)
8597 Parent = cast<RecordDecl>(IndirectMemberDecl->getDeclContext());
Eli Friedman19410a72010-08-05 10:11:36 +00008598
Douglas Gregorcc8a5d52010-04-29 00:18:15 +00008599 // If the member was found in a base class, introduce OffsetOfNodes for
8600 // the base class indirections.
8601 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
8602 /*DetectVirtual=*/false);
Eli Friedman19410a72010-08-05 10:11:36 +00008603 if (IsDerivedFrom(CurrentType, Context.getTypeDeclType(Parent), Paths)) {
Douglas Gregorcc8a5d52010-04-29 00:18:15 +00008604 CXXBasePath &Path = Paths.front();
8605 for (CXXBasePath::iterator B = Path.begin(), BEnd = Path.end();
8606 B != BEnd; ++B)
8607 Comps.push_back(OffsetOfNode(B->Base));
8608 }
Eli Friedman19410a72010-08-05 10:11:36 +00008609
Francois Pichet87c2e122010-11-21 06:08:52 +00008610 if (IndirectMemberDecl) {
8611 for (IndirectFieldDecl::chain_iterator FI =
8612 IndirectMemberDecl->chain_begin(),
8613 FEnd = IndirectMemberDecl->chain_end(); FI != FEnd; FI++) {
8614 assert(isa<FieldDecl>(*FI));
8615 Comps.push_back(OffsetOfNode(OC.LocStart,
8616 cast<FieldDecl>(*FI), OC.LocEnd));
8617 }
8618 } else
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008619 Comps.push_back(OffsetOfNode(OC.LocStart, MemberDecl, OC.LocEnd));
Francois Pichet87c2e122010-11-21 06:08:52 +00008620
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008621 CurrentType = MemberDecl->getType().getNonReferenceType();
8622 }
8623
8624 return Owned(OffsetOfExpr::Create(Context, Context.getSizeType(), BuiltinLoc,
8625 TInfo, Comps.data(), Comps.size(),
8626 Exprs.data(), Exprs.size(), RParenLoc));
8627}
Mike Stumpeed9cac2009-02-19 03:04:26 +00008628
John McCall60d7b3a2010-08-24 06:29:42 +00008629ExprResult Sema::ActOnBuiltinOffsetOf(Scope *S,
John McCall2cd11fe2010-10-12 02:09:17 +00008630 SourceLocation BuiltinLoc,
8631 SourceLocation TypeLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00008632 ParsedType ParsedArgTy,
John McCall2cd11fe2010-10-12 02:09:17 +00008633 OffsetOfComponent *CompPtr,
8634 unsigned NumComponents,
Richard Trieuccd891a2011-09-09 01:45:06 +00008635 SourceLocation RParenLoc) {
John McCall2cd11fe2010-10-12 02:09:17 +00008636
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008637 TypeSourceInfo *ArgTInfo;
Richard Trieuccd891a2011-09-09 01:45:06 +00008638 QualType ArgTy = GetTypeFromParser(ParsedArgTy, &ArgTInfo);
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008639 if (ArgTy.isNull())
8640 return ExprError();
8641
Eli Friedman5a15dc12010-08-05 10:15:45 +00008642 if (!ArgTInfo)
8643 ArgTInfo = Context.getTrivialTypeSourceInfo(ArgTy, TypeLoc);
8644
8645 return BuildBuiltinOffsetOf(BuiltinLoc, ArgTInfo, CompPtr, NumComponents,
Richard Trieuccd891a2011-09-09 01:45:06 +00008646 RParenLoc);
Chris Lattner73d0d4f2007-08-30 17:45:32 +00008647}
8648
8649
John McCall60d7b3a2010-08-24 06:29:42 +00008650ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc,
John McCall2cd11fe2010-10-12 02:09:17 +00008651 Expr *CondExpr,
8652 Expr *LHSExpr, Expr *RHSExpr,
8653 SourceLocation RPLoc) {
Steve Naroffd04fdd52007-08-03 21:21:27 +00008654 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)");
8655
John McCallf89e55a2010-11-18 06:31:45 +00008656 ExprValueKind VK = VK_RValue;
8657 ExprObjectKind OK = OK_Ordinary;
Sebastian Redl28507842009-02-26 14:39:58 +00008658 QualType resType;
Douglas Gregorce940492009-09-25 04:25:58 +00008659 bool ValueDependent = false;
Douglas Gregorc9ecc572009-05-19 22:43:30 +00008660 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) {
Sebastian Redl28507842009-02-26 14:39:58 +00008661 resType = Context.DependentTy;
Douglas Gregorce940492009-09-25 04:25:58 +00008662 ValueDependent = true;
Sebastian Redl28507842009-02-26 14:39:58 +00008663 } else {
8664 // The conditional expression is required to be a constant expression.
8665 llvm::APSInt condEval(32);
8666 SourceLocation ExpLoc;
8667 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc))
Sebastian Redlf53597f2009-03-15 17:47:39 +00008668 return ExprError(Diag(ExpLoc,
8669 diag::err_typecheck_choose_expr_requires_constant)
8670 << CondExpr->getSourceRange());
Steve Naroffd04fdd52007-08-03 21:21:27 +00008671
Sebastian Redl28507842009-02-26 14:39:58 +00008672 // If the condition is > zero, then the AST type is the same as the LSHExpr.
John McCallf89e55a2010-11-18 06:31:45 +00008673 Expr *ActiveExpr = condEval.getZExtValue() ? LHSExpr : RHSExpr;
8674
8675 resType = ActiveExpr->getType();
8676 ValueDependent = ActiveExpr->isValueDependent();
8677 VK = ActiveExpr->getValueKind();
8678 OK = ActiveExpr->getObjectKind();
Sebastian Redl28507842009-02-26 14:39:58 +00008679 }
8680
Sebastian Redlf53597f2009-03-15 17:47:39 +00008681 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr,
John McCallf89e55a2010-11-18 06:31:45 +00008682 resType, VK, OK, RPLoc,
Douglas Gregorce940492009-09-25 04:25:58 +00008683 resType->isDependentType(),
8684 ValueDependent));
Steve Naroffd04fdd52007-08-03 21:21:27 +00008685}
8686
Steve Naroff4eb206b2008-09-03 18:15:37 +00008687//===----------------------------------------------------------------------===//
8688// Clang Extensions.
8689//===----------------------------------------------------------------------===//
8690
8691/// ActOnBlockStart - This callback is invoked when a block literal is started.
Richard Trieuccd891a2011-09-09 01:45:06 +00008692void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *CurScope) {
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008693 BlockDecl *Block = BlockDecl::Create(Context, CurContext, CaretLoc);
Richard Trieuccd891a2011-09-09 01:45:06 +00008694 PushBlockScope(CurScope, Block);
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008695 CurContext->addDecl(Block);
Richard Trieuccd891a2011-09-09 01:45:06 +00008696 if (CurScope)
8697 PushDeclContext(CurScope, Block);
Fariborz Jahaniana729da22010-07-09 18:44:02 +00008698 else
8699 CurContext = Block;
John McCall538773c2011-11-11 03:19:12 +00008700
8701 // Enter a new evaluation context to insulate the block from any
8702 // cleanups from the enclosing full-expression.
8703 PushExpressionEvaluationContext(PotentiallyEvaluated);
Steve Naroff090276f2008-10-10 01:28:17 +00008704}
8705
Mike Stump98eb8a72009-02-04 22:31:32 +00008706void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) {
Mike Stumpaf199f32009-05-07 18:43:07 +00008707 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!");
John McCall711c52b2011-01-05 12:14:39 +00008708 assert(ParamInfo.getContext() == Declarator::BlockLiteralContext);
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008709 BlockScopeInfo *CurBlock = getCurBlock();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008710
John McCallbf1a0282010-06-04 23:28:52 +00008711 TypeSourceInfo *Sig = GetTypeForDeclarator(ParamInfo, CurScope);
John McCallbf1a0282010-06-04 23:28:52 +00008712 QualType T = Sig->getType();
Mike Stump98eb8a72009-02-04 22:31:32 +00008713
John McCall711c52b2011-01-05 12:14:39 +00008714 // GetTypeForDeclarator always produces a function type for a block
8715 // literal signature. Furthermore, it is always a FunctionProtoType
8716 // unless the function was written with a typedef.
8717 assert(T->isFunctionType() &&
8718 "GetTypeForDeclarator made a non-function block signature");
8719
8720 // Look for an explicit signature in that function type.
8721 FunctionProtoTypeLoc ExplicitSignature;
8722
8723 TypeLoc tmp = Sig->getTypeLoc().IgnoreParens();
8724 if (isa<FunctionProtoTypeLoc>(tmp)) {
8725 ExplicitSignature = cast<FunctionProtoTypeLoc>(tmp);
8726
8727 // Check whether that explicit signature was synthesized by
8728 // GetTypeForDeclarator. If so, don't save that as part of the
8729 // written signature.
Abramo Bagnara796aa442011-03-12 11:17:06 +00008730 if (ExplicitSignature.getLocalRangeBegin() ==
8731 ExplicitSignature.getLocalRangeEnd()) {
John McCall711c52b2011-01-05 12:14:39 +00008732 // This would be much cheaper if we stored TypeLocs instead of
8733 // TypeSourceInfos.
8734 TypeLoc Result = ExplicitSignature.getResultLoc();
8735 unsigned Size = Result.getFullDataSize();
8736 Sig = Context.CreateTypeSourceInfo(Result.getType(), Size);
8737 Sig->getTypeLoc().initializeFullCopy(Result, Size);
8738
8739 ExplicitSignature = FunctionProtoTypeLoc();
8740 }
John McCall82dc0092010-06-04 11:21:44 +00008741 }
Mike Stump1eb44332009-09-09 15:08:12 +00008742
John McCall711c52b2011-01-05 12:14:39 +00008743 CurBlock->TheDecl->setSignatureAsWritten(Sig);
8744 CurBlock->FunctionType = T;
8745
8746 const FunctionType *Fn = T->getAs<FunctionType>();
8747 QualType RetTy = Fn->getResultType();
8748 bool isVariadic =
8749 (isa<FunctionProtoType>(Fn) && cast<FunctionProtoType>(Fn)->isVariadic());
8750
John McCallc71a4912010-06-04 19:02:56 +00008751 CurBlock->TheDecl->setIsVariadic(isVariadic);
Douglas Gregora873dfc2010-02-03 00:27:59 +00008752
John McCall82dc0092010-06-04 11:21:44 +00008753 // Don't allow returning a objc interface by value.
8754 if (RetTy->isObjCObjectType()) {
8755 Diag(ParamInfo.getSourceRange().getBegin(),
8756 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy;
8757 return;
8758 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008759
John McCall82dc0092010-06-04 11:21:44 +00008760 // Context.DependentTy is used as a placeholder for a missing block
John McCallc71a4912010-06-04 19:02:56 +00008761 // return type. TODO: what should we do with declarators like:
8762 // ^ * { ... }
8763 // If the answer is "apply template argument deduction"....
Fariborz Jahanian05865202011-12-03 17:47:53 +00008764 if (RetTy != Context.DependentTy) {
John McCall82dc0092010-06-04 11:21:44 +00008765 CurBlock->ReturnType = RetTy;
Fariborz Jahanian05865202011-12-03 17:47:53 +00008766 CurBlock->TheDecl->setBlockMissingReturnType(false);
8767 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008768
John McCall82dc0092010-06-04 11:21:44 +00008769 // Push block parameters from the declarator if we had them.
Chris Lattner5f9e2722011-07-23 10:55:15 +00008770 SmallVector<ParmVarDecl*, 8> Params;
John McCall711c52b2011-01-05 12:14:39 +00008771 if (ExplicitSignature) {
8772 for (unsigned I = 0, E = ExplicitSignature.getNumArgs(); I != E; ++I) {
8773 ParmVarDecl *Param = ExplicitSignature.getArg(I);
Fariborz Jahanian9a66c302010-02-12 21:53:14 +00008774 if (Param->getIdentifier() == 0 &&
8775 !Param->isImplicit() &&
8776 !Param->isInvalidDecl() &&
8777 !getLangOptions().CPlusPlus)
8778 Diag(Param->getLocation(), diag::err_parameter_name_omitted);
John McCallc71a4912010-06-04 19:02:56 +00008779 Params.push_back(Param);
Fariborz Jahanian9a66c302010-02-12 21:53:14 +00008780 }
John McCall82dc0092010-06-04 11:21:44 +00008781
8782 // Fake up parameter variables if we have a typedef, like
8783 // ^ fntype { ... }
8784 } else if (const FunctionProtoType *Fn = T->getAs<FunctionProtoType>()) {
8785 for (FunctionProtoType::arg_type_iterator
8786 I = Fn->arg_type_begin(), E = Fn->arg_type_end(); I != E; ++I) {
8787 ParmVarDecl *Param =
8788 BuildParmVarDeclForTypedef(CurBlock->TheDecl,
8789 ParamInfo.getSourceRange().getBegin(),
8790 *I);
John McCallc71a4912010-06-04 19:02:56 +00008791 Params.push_back(Param);
John McCall82dc0092010-06-04 11:21:44 +00008792 }
Steve Naroff4eb206b2008-09-03 18:15:37 +00008793 }
John McCall82dc0092010-06-04 11:21:44 +00008794
John McCallc71a4912010-06-04 19:02:56 +00008795 // Set the parameters on the block decl.
Douglas Gregor82aa7132010-11-01 18:37:59 +00008796 if (!Params.empty()) {
David Blaikie4278c652011-09-21 18:16:56 +00008797 CurBlock->TheDecl->setParams(Params);
Douglas Gregor82aa7132010-11-01 18:37:59 +00008798 CheckParmsForFunctionDef(CurBlock->TheDecl->param_begin(),
8799 CurBlock->TheDecl->param_end(),
8800 /*CheckParameterNames=*/false);
8801 }
8802
John McCall82dc0092010-06-04 11:21:44 +00008803 // Finally we can process decl attributes.
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00008804 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo);
John McCall053f4bd2010-03-22 09:20:08 +00008805
John McCall82dc0092010-06-04 11:21:44 +00008806 // Put the parameter variables in scope. We can bail out immediately
8807 // if we don't have any.
John McCallc71a4912010-06-04 19:02:56 +00008808 if (Params.empty())
John McCall82dc0092010-06-04 11:21:44 +00008809 return;
8810
Steve Naroff090276f2008-10-10 01:28:17 +00008811 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(),
John McCall7a9813c2010-01-22 00:28:27 +00008812 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) {
8813 (*AI)->setOwningFunction(CurBlock->TheDecl);
8814
Steve Naroff090276f2008-10-10 01:28:17 +00008815 // If this has an identifier, add it to the scope stack.
John McCall053f4bd2010-03-22 09:20:08 +00008816 if ((*AI)->getIdentifier()) {
Argyrios Kyrtzidis08274082010-12-15 18:44:22 +00008817 CheckShadow(CurBlock->TheScope, *AI);
John McCall053f4bd2010-03-22 09:20:08 +00008818
Steve Naroff090276f2008-10-10 01:28:17 +00008819 PushOnScopeChains(*AI, CurBlock->TheScope);
John McCall053f4bd2010-03-22 09:20:08 +00008820 }
John McCall7a9813c2010-01-22 00:28:27 +00008821 }
Steve Naroff4eb206b2008-09-03 18:15:37 +00008822}
8823
8824/// ActOnBlockError - If there is an error parsing a block, this callback
8825/// is invoked to pop the information about the block from the action impl.
8826void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) {
John McCall538773c2011-11-11 03:19:12 +00008827 // Leave the expression-evaluation context.
8828 DiscardCleanupsInEvaluationContext();
8829 PopExpressionEvaluationContext();
8830
Steve Naroff4eb206b2008-09-03 18:15:37 +00008831 // Pop off CurBlock, handle nested blocks.
Chris Lattner5c59e2b2009-04-21 22:38:46 +00008832 PopDeclContext();
Eli Friedmanec9ea722012-01-05 03:35:19 +00008833 PopFunctionScopeInfo();
Steve Naroff4eb206b2008-09-03 18:15:37 +00008834}
8835
8836/// ActOnBlockStmtExpr - This is called when the body of a block statement
8837/// literal was successfully completed. ^(int x){...}
John McCall60d7b3a2010-08-24 06:29:42 +00008838ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
Chris Lattnere476bdc2011-02-17 23:58:47 +00008839 Stmt *Body, Scope *CurScope) {
Chris Lattner9af55002009-03-27 04:18:06 +00008840 // If blocks are disabled, emit an error.
8841 if (!LangOpts.Blocks)
8842 Diag(CaretLoc, diag::err_blocks_disable);
Mike Stump1eb44332009-09-09 15:08:12 +00008843
John McCall538773c2011-11-11 03:19:12 +00008844 // Leave the expression-evaluation context.
8845 assert(!ExprNeedsCleanups && "cleanups within block not correctly bound!");
8846 PopExpressionEvaluationContext();
8847
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008848 BlockScopeInfo *BSI = cast<BlockScopeInfo>(FunctionScopes.back());
Fariborz Jahaniana729da22010-07-09 18:44:02 +00008849
Steve Naroff090276f2008-10-10 01:28:17 +00008850 PopDeclContext();
8851
Steve Naroff4eb206b2008-09-03 18:15:37 +00008852 QualType RetTy = Context.VoidTy;
Fariborz Jahanian7d5c74e2009-06-19 23:37:08 +00008853 if (!BSI->ReturnType.isNull())
8854 RetTy = BSI->ReturnType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00008855
Mike Stump56925862009-07-28 22:04:01 +00008856 bool NoReturn = BSI->TheDecl->getAttr<NoReturnAttr>();
Steve Naroff4eb206b2008-09-03 18:15:37 +00008857 QualType BlockTy;
John McCallc71a4912010-06-04 19:02:56 +00008858
John McCall469a1eb2011-02-02 13:00:07 +00008859 // Set the captured variables on the block.
Eli Friedmanb69b42c2012-01-11 02:36:31 +00008860 // FIXME: Share capture structure between BlockDecl and CapturingScopeInfo!
8861 SmallVector<BlockDecl::Capture, 4> Captures;
8862 for (unsigned i = 0, e = BSI->Captures.size(); i != e; i++) {
8863 CapturingScopeInfo::Capture &Cap = BSI->Captures[i];
8864 if (Cap.isThisCapture())
8865 continue;
8866 BlockDecl::Capture NewCap(Cap.getVariable(), Cap.isReferenceCapture(),
8867 Cap.isNested(), Cap.getCopyExpr());
8868 Captures.push_back(NewCap);
8869 }
8870 BSI->TheDecl->setCaptures(Context, Captures.begin(), Captures.end(),
8871 BSI->CXXThisCaptureIndex != 0);
John McCall469a1eb2011-02-02 13:00:07 +00008872
John McCallc71a4912010-06-04 19:02:56 +00008873 // If the user wrote a function type in some form, try to use that.
8874 if (!BSI->FunctionType.isNull()) {
8875 const FunctionType *FTy = BSI->FunctionType->getAs<FunctionType>();
8876
8877 FunctionType::ExtInfo Ext = FTy->getExtInfo();
8878 if (NoReturn && !Ext.getNoReturn()) Ext = Ext.withNoReturn(true);
8879
8880 // Turn protoless block types into nullary block types.
8881 if (isa<FunctionNoProtoType>(FTy)) {
John McCalle23cf432010-12-14 08:05:40 +00008882 FunctionProtoType::ExtProtoInfo EPI;
8883 EPI.ExtInfo = Ext;
8884 BlockTy = Context.getFunctionType(RetTy, 0, 0, EPI);
John McCallc71a4912010-06-04 19:02:56 +00008885
8886 // Otherwise, if we don't need to change anything about the function type,
8887 // preserve its sugar structure.
8888 } else if (FTy->getResultType() == RetTy &&
8889 (!NoReturn || FTy->getNoReturnAttr())) {
8890 BlockTy = BSI->FunctionType;
8891
8892 // Otherwise, make the minimal modifications to the function type.
8893 } else {
8894 const FunctionProtoType *FPT = cast<FunctionProtoType>(FTy);
John McCalle23cf432010-12-14 08:05:40 +00008895 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
8896 EPI.TypeQuals = 0; // FIXME: silently?
8897 EPI.ExtInfo = Ext;
John McCallc71a4912010-06-04 19:02:56 +00008898 BlockTy = Context.getFunctionType(RetTy,
8899 FPT->arg_type_begin(),
8900 FPT->getNumArgs(),
John McCalle23cf432010-12-14 08:05:40 +00008901 EPI);
John McCallc71a4912010-06-04 19:02:56 +00008902 }
8903
8904 // If we don't have a function type, just build one from nothing.
8905 } else {
John McCalle23cf432010-12-14 08:05:40 +00008906 FunctionProtoType::ExtProtoInfo EPI;
John McCallf85e1932011-06-15 23:02:42 +00008907 EPI.ExtInfo = FunctionType::ExtInfo().withNoReturn(NoReturn);
John McCalle23cf432010-12-14 08:05:40 +00008908 BlockTy = Context.getFunctionType(RetTy, 0, 0, EPI);
John McCallc71a4912010-06-04 19:02:56 +00008909 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008910
John McCallc71a4912010-06-04 19:02:56 +00008911 DiagnoseUnusedParameters(BSI->TheDecl->param_begin(),
8912 BSI->TheDecl->param_end());
Steve Naroff4eb206b2008-09-03 18:15:37 +00008913 BlockTy = Context.getBlockPointerType(BlockTy);
Mike Stumpeed9cac2009-02-19 03:04:26 +00008914
Chris Lattner17a78302009-04-19 05:28:12 +00008915 // If needed, diagnose invalid gotos and switches in the block.
John McCallf85e1932011-06-15 23:02:42 +00008916 if (getCurFunction()->NeedsScopeChecking() &&
8917 !hasAnyUnrecoverableErrorsInThisFunction())
John McCall9ae2f072010-08-23 23:25:46 +00008918 DiagnoseInvalidJumps(cast<CompoundStmt>(Body));
Mike Stump1eb44332009-09-09 15:08:12 +00008919
Chris Lattnere476bdc2011-02-17 23:58:47 +00008920 BSI->TheDecl->setBody(cast<CompoundStmt>(Body));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008921
Fariborz Jahanian4e7c7f22011-07-11 18:04:54 +00008922 for (BlockDecl::capture_const_iterator ci = BSI->TheDecl->capture_begin(),
8923 ce = BSI->TheDecl->capture_end(); ci != ce; ++ci) {
8924 const VarDecl *variable = ci->getVariable();
8925 QualType T = variable->getType();
8926 QualType::DestructionKind destructKind = T.isDestructedType();
8927 if (destructKind != QualType::DK_none)
8928 getCurFunction()->setHasBranchProtectedScope();
8929 }
8930
Douglas Gregorf8b7f712011-09-06 20:46:03 +00008931 computeNRVO(Body, getCurBlock());
8932
Benjamin Kramerd2486192011-07-12 14:11:05 +00008933 BlockExpr *Result = new (Context) BlockExpr(BSI->TheDecl, BlockTy);
8934 const AnalysisBasedWarnings::Policy &WP = AnalysisWarnings.getDefaultPolicy();
Eli Friedmanec9ea722012-01-05 03:35:19 +00008935 PopFunctionScopeInfo(&WP, Result->getBlockDecl(), Result);
Benjamin Kramerd2486192011-07-12 14:11:05 +00008936
John McCall80ee6e82011-11-10 05:35:25 +00008937 // If the block isn't obviously global, i.e. it captures anything at
8938 // all, mark this full-expression as needing a cleanup.
8939 if (Result->getBlockDecl()->hasCaptures()) {
8940 ExprCleanupObjects.push_back(Result->getBlockDecl());
8941 ExprNeedsCleanups = true;
8942 }
8943
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008944 return Owned(Result);
Steve Naroff4eb206b2008-09-03 18:15:37 +00008945}
8946
John McCall60d7b3a2010-08-24 06:29:42 +00008947ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc,
Richard Trieuccd891a2011-09-09 01:45:06 +00008948 Expr *E, ParsedType Ty,
Sebastian Redlf53597f2009-03-15 17:47:39 +00008949 SourceLocation RPLoc) {
Abramo Bagnara2cad9002010-08-10 10:06:15 +00008950 TypeSourceInfo *TInfo;
Richard Trieuccd891a2011-09-09 01:45:06 +00008951 GetTypeFromParser(Ty, &TInfo);
8952 return BuildVAArgExpr(BuiltinLoc, E, TInfo, RPLoc);
Abramo Bagnara2cad9002010-08-10 10:06:15 +00008953}
8954
John McCall60d7b3a2010-08-24 06:29:42 +00008955ExprResult Sema::BuildVAArgExpr(SourceLocation BuiltinLoc,
John McCallf89e55a2010-11-18 06:31:45 +00008956 Expr *E, TypeSourceInfo *TInfo,
8957 SourceLocation RPLoc) {
Chris Lattner0d20b8a2009-04-05 15:49:53 +00008958 Expr *OrigExpr = E;
Mike Stump1eb44332009-09-09 15:08:12 +00008959
Eli Friedmanc34bcde2008-08-09 23:32:40 +00008960 // Get the va_list type
8961 QualType VaListType = Context.getBuiltinVaListType();
Eli Friedman5c091ba2009-05-16 12:46:54 +00008962 if (VaListType->isArrayType()) {
8963 // Deal with implicit array decay; for example, on x86-64,
8964 // va_list is an array, but it's supposed to decay to
8965 // a pointer for va_arg.
Eli Friedmanc34bcde2008-08-09 23:32:40 +00008966 VaListType = Context.getArrayDecayedType(VaListType);
Eli Friedman5c091ba2009-05-16 12:46:54 +00008967 // Make sure the input expression also decays appropriately.
John Wiegley429bb272011-04-08 18:41:53 +00008968 ExprResult Result = UsualUnaryConversions(E);
8969 if (Result.isInvalid())
8970 return ExprError();
8971 E = Result.take();
Eli Friedman5c091ba2009-05-16 12:46:54 +00008972 } else {
8973 // Otherwise, the va_list argument must be an l-value because
8974 // it is modified by va_arg.
Mike Stump1eb44332009-09-09 15:08:12 +00008975 if (!E->isTypeDependent() &&
Douglas Gregordd027302009-05-19 23:10:31 +00008976 CheckForModifiableLvalue(E, BuiltinLoc, *this))
Eli Friedman5c091ba2009-05-16 12:46:54 +00008977 return ExprError();
8978 }
Eli Friedmanc34bcde2008-08-09 23:32:40 +00008979
Douglas Gregordd027302009-05-19 23:10:31 +00008980 if (!E->isTypeDependent() &&
8981 !Context.hasSameType(VaListType, E->getType())) {
Sebastian Redlf53597f2009-03-15 17:47:39 +00008982 return ExprError(Diag(E->getLocStart(),
8983 diag::err_first_argument_to_va_arg_not_of_type_va_list)
Chris Lattner0d20b8a2009-04-05 15:49:53 +00008984 << OrigExpr->getType() << E->getSourceRange());
Chris Lattner9dc8f192009-04-05 00:59:53 +00008985 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008986
David Majnemer0adde122011-06-14 05:17:32 +00008987 if (!TInfo->getType()->isDependentType()) {
8988 if (RequireCompleteType(TInfo->getTypeLoc().getBeginLoc(), TInfo->getType(),
8989 PDiag(diag::err_second_parameter_to_va_arg_incomplete)
8990 << TInfo->getTypeLoc().getSourceRange()))
8991 return ExprError();
David Majnemerdb11b012011-06-13 06:37:03 +00008992
David Majnemer0adde122011-06-14 05:17:32 +00008993 if (RequireNonAbstractType(TInfo->getTypeLoc().getBeginLoc(),
8994 TInfo->getType(),
8995 PDiag(diag::err_second_parameter_to_va_arg_abstract)
8996 << TInfo->getTypeLoc().getSourceRange()))
8997 return ExprError();
8998
Douglas Gregor4eb75222011-07-30 06:45:27 +00008999 if (!TInfo->getType().isPODType(Context)) {
David Majnemer0adde122011-06-14 05:17:32 +00009000 Diag(TInfo->getTypeLoc().getBeginLoc(),
Douglas Gregor4eb75222011-07-30 06:45:27 +00009001 TInfo->getType()->isObjCLifetimeType()
9002 ? diag::warn_second_parameter_to_va_arg_ownership_qualified
9003 : diag::warn_second_parameter_to_va_arg_not_pod)
David Majnemer0adde122011-06-14 05:17:32 +00009004 << TInfo->getType()
9005 << TInfo->getTypeLoc().getSourceRange();
Douglas Gregor4eb75222011-07-30 06:45:27 +00009006 }
Eli Friedman46d37c12011-07-11 21:45:59 +00009007
9008 // Check for va_arg where arguments of the given type will be promoted
9009 // (i.e. this va_arg is guaranteed to have undefined behavior).
9010 QualType PromoteType;
9011 if (TInfo->getType()->isPromotableIntegerType()) {
9012 PromoteType = Context.getPromotedIntegerType(TInfo->getType());
9013 if (Context.typesAreCompatible(PromoteType, TInfo->getType()))
9014 PromoteType = QualType();
9015 }
9016 if (TInfo->getType()->isSpecificBuiltinType(BuiltinType::Float))
9017 PromoteType = Context.DoubleTy;
9018 if (!PromoteType.isNull())
9019 Diag(TInfo->getTypeLoc().getBeginLoc(),
9020 diag::warn_second_parameter_to_va_arg_never_compatible)
9021 << TInfo->getType()
9022 << PromoteType
9023 << TInfo->getTypeLoc().getSourceRange();
David Majnemer0adde122011-06-14 05:17:32 +00009024 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00009025
Abramo Bagnara2cad9002010-08-10 10:06:15 +00009026 QualType T = TInfo->getType().getNonLValueExprType(Context);
9027 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, TInfo, RPLoc, T));
Anders Carlsson7c50aca2007-10-15 20:28:48 +00009028}
9029
John McCall60d7b3a2010-08-24 06:29:42 +00009030ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) {
Douglas Gregor2d8b2732008-11-29 04:51:27 +00009031 // The type of __null will be int or long, depending on the size of
9032 // pointers on the target.
9033 QualType Ty;
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00009034 unsigned pw = Context.getTargetInfo().getPointerWidth(0);
9035 if (pw == Context.getTargetInfo().getIntWidth())
Douglas Gregor2d8b2732008-11-29 04:51:27 +00009036 Ty = Context.IntTy;
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00009037 else if (pw == Context.getTargetInfo().getLongWidth())
Douglas Gregor2d8b2732008-11-29 04:51:27 +00009038 Ty = Context.LongTy;
Douglas Gregorbcfd1f52011-09-02 00:18:52 +00009039 else if (pw == Context.getTargetInfo().getLongLongWidth())
NAKAMURA Takumi6e5658d2011-01-19 00:11:41 +00009040 Ty = Context.LongLongTy;
9041 else {
David Blaikieb219cfc2011-09-23 05:06:16 +00009042 llvm_unreachable("I don't know size of pointer!");
NAKAMURA Takumi6e5658d2011-01-19 00:11:41 +00009043 }
Douglas Gregor2d8b2732008-11-29 04:51:27 +00009044
Sebastian Redlf53597f2009-03-15 17:47:39 +00009045 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc));
Douglas Gregor2d8b2732008-11-29 04:51:27 +00009046}
9047
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00009048static void MakeObjCStringLiteralFixItHint(Sema& SemaRef, QualType DstType,
Douglas Gregor849b2432010-03-31 17:46:05 +00009049 Expr *SrcExpr, FixItHint &Hint) {
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00009050 if (!SemaRef.getLangOptions().ObjC1)
9051 return;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009052
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00009053 const ObjCObjectPointerType *PT = DstType->getAs<ObjCObjectPointerType>();
9054 if (!PT)
9055 return;
9056
9057 // Check if the destination is of type 'id'.
9058 if (!PT->isObjCIdType()) {
9059 // Check if the destination is the 'NSString' interface.
9060 const ObjCInterfaceDecl *ID = PT->getInterfaceDecl();
9061 if (!ID || !ID->getIdentifier()->isStr("NSString"))
9062 return;
9063 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009064
John McCall4b9c2d22011-11-06 09:01:30 +00009065 // Ignore any parens, implicit casts (should only be
9066 // array-to-pointer decays), and not-so-opaque values. The last is
9067 // important for making this trigger for property assignments.
9068 SrcExpr = SrcExpr->IgnoreParenImpCasts();
9069 if (OpaqueValueExpr *OV = dyn_cast<OpaqueValueExpr>(SrcExpr))
9070 if (OV->getSourceExpr())
9071 SrcExpr = OV->getSourceExpr()->IgnoreParenImpCasts();
9072
9073 StringLiteral *SL = dyn_cast<StringLiteral>(SrcExpr);
Douglas Gregor5cee1192011-07-27 05:40:30 +00009074 if (!SL || !SL->isAscii())
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00009075 return;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009076
Douglas Gregor849b2432010-03-31 17:46:05 +00009077 Hint = FixItHint::CreateInsertion(SL->getLocStart(), "@");
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00009078}
9079
Chris Lattner5cf216b2008-01-04 18:04:52 +00009080bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy,
9081 SourceLocation Loc,
9082 QualType DstType, QualType SrcType,
Douglas Gregora41a8c52010-04-22 00:20:18 +00009083 Expr *SrcExpr, AssignmentAction Action,
9084 bool *Complained) {
9085 if (Complained)
9086 *Complained = false;
9087
Chris Lattner5cf216b2008-01-04 18:04:52 +00009088 // Decode the result (notice that AST's are still created for extensions).
Douglas Gregor926df6c2011-06-11 01:09:30 +00009089 bool CheckInferredResultType = false;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009090 bool isInvalid = false;
9091 unsigned DiagKind;
Douglas Gregor849b2432010-03-31 17:46:05 +00009092 FixItHint Hint;
Anna Zaks67221552011-07-28 19:51:27 +00009093 ConversionFixItGenerator ConvHints;
9094 bool MayHaveConvFixit = false;
Richard Trieu6efd4c52011-11-23 22:32:32 +00009095 bool MayHaveFunctionDiff = false;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009096
Chris Lattner5cf216b2008-01-04 18:04:52 +00009097 switch (ConvTy) {
David Blaikieb219cfc2011-09-23 05:06:16 +00009098 default: llvm_unreachable("Unknown conversion type");
Chris Lattner5cf216b2008-01-04 18:04:52 +00009099 case Compatible: return false;
Chris Lattnerb7b61152008-01-04 18:22:42 +00009100 case PointerToInt:
Chris Lattner5cf216b2008-01-04 18:04:52 +00009101 DiagKind = diag::ext_typecheck_convert_pointer_int;
Anna Zaks67221552011-07-28 19:51:27 +00009102 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
9103 MayHaveConvFixit = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009104 break;
Chris Lattnerb7b61152008-01-04 18:22:42 +00009105 case IntToPointer:
9106 DiagKind = diag::ext_typecheck_convert_int_pointer;
Anna Zaks67221552011-07-28 19:51:27 +00009107 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
9108 MayHaveConvFixit = true;
Chris Lattnerb7b61152008-01-04 18:22:42 +00009109 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009110 case IncompatiblePointer:
Douglas Gregor849b2432010-03-31 17:46:05 +00009111 MakeObjCStringLiteralFixItHint(*this, DstType, SrcExpr, Hint);
Chris Lattner5cf216b2008-01-04 18:04:52 +00009112 DiagKind = diag::ext_typecheck_convert_incompatible_pointer;
Douglas Gregor926df6c2011-06-11 01:09:30 +00009113 CheckInferredResultType = DstType->isObjCObjectPointerType() &&
9114 SrcType->isObjCObjectPointerType();
Anna Zaks67221552011-07-28 19:51:27 +00009115 if (Hint.isNull() && !CheckInferredResultType) {
9116 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
9117 }
9118 MayHaveConvFixit = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009119 break;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00009120 case IncompatiblePointerSign:
9121 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign;
9122 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009123 case FunctionVoidPointer:
9124 DiagKind = diag::ext_typecheck_convert_pointer_void_func;
9125 break;
John McCall86c05f32011-02-01 00:10:29 +00009126 case IncompatiblePointerDiscardsQualifiers: {
John McCall40249e72011-02-01 23:28:01 +00009127 // Perform array-to-pointer decay if necessary.
9128 if (SrcType->isArrayType()) SrcType = Context.getArrayDecayedType(SrcType);
9129
John McCall86c05f32011-02-01 00:10:29 +00009130 Qualifiers lhq = SrcType->getPointeeType().getQualifiers();
9131 Qualifiers rhq = DstType->getPointeeType().getQualifiers();
9132 if (lhq.getAddressSpace() != rhq.getAddressSpace()) {
9133 DiagKind = diag::err_typecheck_incompatible_address_space;
9134 break;
John McCallf85e1932011-06-15 23:02:42 +00009135
9136
9137 } else if (lhq.getObjCLifetime() != rhq.getObjCLifetime()) {
Argyrios Kyrtzidisb8b03132011-06-24 00:08:59 +00009138 DiagKind = diag::err_typecheck_incompatible_ownership;
John McCallf85e1932011-06-15 23:02:42 +00009139 break;
John McCall86c05f32011-02-01 00:10:29 +00009140 }
9141
9142 llvm_unreachable("unknown error case for discarding qualifiers!");
9143 // fallthrough
9144 }
Chris Lattner5cf216b2008-01-04 18:04:52 +00009145 case CompatiblePointerDiscardsQualifiers:
Douglas Gregor77a52232008-09-12 00:47:35 +00009146 // If the qualifiers lost were because we were applying the
9147 // (deprecated) C++ conversion from a string literal to a char*
9148 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME:
9149 // Ideally, this check would be performed in
John McCalle4be87e2011-01-31 23:13:11 +00009150 // checkPointerTypesForAssignment. However, that would require a
Douglas Gregor77a52232008-09-12 00:47:35 +00009151 // bit of refactoring (so that the second argument is an
9152 // expression, rather than a type), which should be done as part
John McCalle4be87e2011-01-31 23:13:11 +00009153 // of a larger effort to fix checkPointerTypesForAssignment for
Douglas Gregor77a52232008-09-12 00:47:35 +00009154 // C++ semantics.
9155 if (getLangOptions().CPlusPlus &&
9156 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType))
9157 return false;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009158 DiagKind = diag::ext_typecheck_convert_discards_qualifiers;
9159 break;
Sean Huntc9132b62009-11-08 07:46:34 +00009160 case IncompatibleNestedPointerQualifiers:
Fariborz Jahanian3451e922009-11-09 22:16:37 +00009161 DiagKind = diag::ext_nested_pointer_qualifier_mismatch;
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00009162 break;
Steve Naroff1c7d0672008-09-04 15:10:53 +00009163 case IntToBlockPointer:
9164 DiagKind = diag::err_int_to_block_pointer;
9165 break;
9166 case IncompatibleBlockPointer:
Mike Stump25efa102009-04-21 22:51:42 +00009167 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer;
Steve Naroff1c7d0672008-09-04 15:10:53 +00009168 break;
Steve Naroff39579072008-10-14 22:18:38 +00009169 case IncompatibleObjCQualifiedId:
Mike Stumpeed9cac2009-02-19 03:04:26 +00009170 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since
Steve Naroff39579072008-10-14 22:18:38 +00009171 // it can give a more specific diagnostic.
9172 DiagKind = diag::warn_incompatible_qualified_id;
9173 break;
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00009174 case IncompatibleVectors:
9175 DiagKind = diag::warn_incompatible_vectors;
9176 break;
Fariborz Jahanian04e5a252011-07-07 18:55:47 +00009177 case IncompatibleObjCWeakRef:
9178 DiagKind = diag::err_arc_weak_unavailable_assign;
9179 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009180 case Incompatible:
9181 DiagKind = diag::err_typecheck_convert_incompatible;
Anna Zaks67221552011-07-28 19:51:27 +00009182 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
9183 MayHaveConvFixit = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009184 isInvalid = true;
Richard Trieu6efd4c52011-11-23 22:32:32 +00009185 MayHaveFunctionDiff = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009186 break;
9187 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00009188
Douglas Gregord4eea832010-04-09 00:35:39 +00009189 QualType FirstType, SecondType;
9190 switch (Action) {
9191 case AA_Assigning:
9192 case AA_Initializing:
9193 // The destination type comes first.
9194 FirstType = DstType;
9195 SecondType = SrcType;
9196 break;
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00009197
Douglas Gregord4eea832010-04-09 00:35:39 +00009198 case AA_Returning:
9199 case AA_Passing:
9200 case AA_Converting:
9201 case AA_Sending:
9202 case AA_Casting:
9203 // The source type comes first.
9204 FirstType = SrcType;
9205 SecondType = DstType;
9206 break;
9207 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00009208
Anna Zaks67221552011-07-28 19:51:27 +00009209 PartialDiagnostic FDiag = PDiag(DiagKind);
9210 FDiag << FirstType << SecondType << Action << SrcExpr->getSourceRange();
9211
9212 // If we can fix the conversion, suggest the FixIts.
9213 assert(ConvHints.isNull() || Hint.isNull());
9214 if (!ConvHints.isNull()) {
Benjamin Kramer1136ef02012-01-14 21:05:10 +00009215 for (std::vector<FixItHint>::iterator HI = ConvHints.Hints.begin(),
9216 HE = ConvHints.Hints.end(); HI != HE; ++HI)
Anna Zaks67221552011-07-28 19:51:27 +00009217 FDiag << *HI;
9218 } else {
9219 FDiag << Hint;
9220 }
9221 if (MayHaveConvFixit) { FDiag << (unsigned) (ConvHints.Kind); }
9222
Richard Trieu6efd4c52011-11-23 22:32:32 +00009223 if (MayHaveFunctionDiff)
9224 HandleFunctionTypeMismatch(FDiag, SecondType, FirstType);
9225
Anna Zaks67221552011-07-28 19:51:27 +00009226 Diag(Loc, FDiag);
9227
Richard Trieu6efd4c52011-11-23 22:32:32 +00009228 if (SecondType == Context.OverloadTy)
9229 NoteAllOverloadCandidates(OverloadExpr::find(SrcExpr).Expression,
9230 FirstType);
9231
Douglas Gregor926df6c2011-06-11 01:09:30 +00009232 if (CheckInferredResultType)
9233 EmitRelatedResultTypeNote(SrcExpr);
9234
Douglas Gregora41a8c52010-04-22 00:20:18 +00009235 if (Complained)
9236 *Complained = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +00009237 return isInvalid;
9238}
Anders Carlssone21555e2008-11-30 19:50:32 +00009239
Richard Smithdaaefc52011-12-14 23:32:26 +00009240bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result,
9241 unsigned DiagID, bool AllowFold) {
9242 // Circumvent ICE checking in C++11 to avoid evaluating the expression twice
9243 // in the non-ICE case.
9244 if (!getLangOptions().CPlusPlus0x) {
9245 if (E->isIntegerConstantExpr(Context)) {
9246 if (Result)
9247 *Result = E->EvaluateKnownConstInt(Context);
9248 return false;
9249 }
Eli Friedman3b5ccca2009-04-25 22:26:58 +00009250 }
9251
Anders Carlssone21555e2008-11-30 19:50:32 +00009252 Expr::EvalResult EvalResult;
Richard Smithdd1f29b2011-12-12 09:28:41 +00009253 llvm::SmallVector<PartialDiagnosticAt, 8> Notes;
9254 EvalResult.Diag = &Notes;
Anders Carlssone21555e2008-11-30 19:50:32 +00009255
Richard Smithdaaefc52011-12-14 23:32:26 +00009256 // Try to evaluate the expression, and produce diagnostics explaining why it's
9257 // not a constant expression as a side-effect.
9258 bool Folded = E->EvaluateAsRValue(EvalResult, Context) &&
9259 EvalResult.Val.isInt() && !EvalResult.HasSideEffects;
9260
9261 // In C++11, we can rely on diagnostics being produced for any expression
9262 // which is not a constant expression. If no diagnostics were produced, then
9263 // this is a constant expression.
9264 if (Folded && getLangOptions().CPlusPlus0x && Notes.empty()) {
9265 if (Result)
9266 *Result = EvalResult.Val.getInt();
9267 return false;
9268 }
9269
9270 if (!Folded || !AllowFold) {
9271 Diag(E->getSourceRange().getBegin(),
Benjamin Kramer85c60db2011-12-18 12:18:02 +00009272 DiagID ? DiagID : unsigned(diag::err_expr_not_ice))
9273 << E->getSourceRange();
Anders Carlssone21555e2008-11-30 19:50:32 +00009274
Richard Smithdd1f29b2011-12-12 09:28:41 +00009275 // We only show the notes if they're not the usual "invalid subexpression"
9276 // or if they are actually in a subexpression.
Richard Smithdaaefc52011-12-14 23:32:26 +00009277 if (Notes.size() != 1 ||
9278 Notes[0].second.getDiagID() != diag::note_invalid_subexpr_in_const_expr
9279 || Notes[0].first != E->IgnoreParens()->getExprLoc()) {
Richard Smithdd1f29b2011-12-12 09:28:41 +00009280 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
9281 Diag(Notes[I].first, Notes[I].second);
Anders Carlssone21555e2008-11-30 19:50:32 +00009282 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00009283
Anders Carlssone21555e2008-11-30 19:50:32 +00009284 return true;
9285 }
9286
Richard Smithdaaefc52011-12-14 23:32:26 +00009287 Diag(E->getSourceRange().getBegin(), diag::ext_expr_not_ice)
9288 << E->getSourceRange();
Anders Carlssone21555e2008-11-30 19:50:32 +00009289
Richard Smithdaaefc52011-12-14 23:32:26 +00009290 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice, E->getExprLoc())
David Blaikied6471f72011-09-25 23:23:43 +00009291 != DiagnosticsEngine::Ignored)
Richard Smithdd1f29b2011-12-12 09:28:41 +00009292 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
9293 Diag(Notes[I].first, Notes[I].second);
Mike Stumpeed9cac2009-02-19 03:04:26 +00009294
Anders Carlssone21555e2008-11-30 19:50:32 +00009295 if (Result)
9296 *Result = EvalResult.Val.getInt();
9297 return false;
9298}
Douglas Gregore0762c92009-06-19 23:52:42 +00009299
Douglas Gregor2afce722009-11-26 00:44:06 +00009300void
Mike Stump1eb44332009-09-09 15:08:12 +00009301Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) {
Douglas Gregor2afce722009-11-26 00:44:06 +00009302 ExprEvalContexts.push_back(
John McCallf85e1932011-06-15 23:02:42 +00009303 ExpressionEvaluationContextRecord(NewContext,
John McCall80ee6e82011-11-10 05:35:25 +00009304 ExprCleanupObjects.size(),
John McCallf85e1932011-06-15 23:02:42 +00009305 ExprNeedsCleanups));
9306 ExprNeedsCleanups = false;
Douglas Gregorac7610d2009-06-22 20:57:11 +00009307}
9308
Richard Trieu67e29332011-08-02 04:35:43 +00009309void Sema::PopExpressionEvaluationContext() {
Douglas Gregor2afce722009-11-26 00:44:06 +00009310 // Pop the current expression evaluation context off the stack.
9311 ExpressionEvaluationContextRecord Rec = ExprEvalContexts.back();
9312 ExprEvalContexts.pop_back();
Douglas Gregorac7610d2009-06-22 20:57:11 +00009313
Douglas Gregor06d33692009-12-12 07:57:52 +00009314 if (Rec.Context == PotentiallyPotentiallyEvaluated) {
9315 if (Rec.PotentiallyReferenced) {
9316 // Mark any remaining declarations in the current position of the stack
9317 // as "referenced". If they were not meant to be referenced, semantic
9318 // analysis would have eliminated them (e.g., in ActOnCXXTypeId).
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009319 for (PotentiallyReferencedDecls::iterator
Douglas Gregor06d33692009-12-12 07:57:52 +00009320 I = Rec.PotentiallyReferenced->begin(),
9321 IEnd = Rec.PotentiallyReferenced->end();
9322 I != IEnd; ++I)
9323 MarkDeclarationReferenced(I->first, I->second);
9324 }
9325
9326 if (Rec.PotentiallyDiagnosed) {
9327 // Emit any pending diagnostics.
9328 for (PotentiallyEmittedDiagnostics::iterator
9329 I = Rec.PotentiallyDiagnosed->begin(),
9330 IEnd = Rec.PotentiallyDiagnosed->end();
9331 I != IEnd; ++I)
9332 Diag(I->first, I->second);
9333 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009334 }
Douglas Gregor2afce722009-11-26 00:44:06 +00009335
9336 // When are coming out of an unevaluated context, clear out any
9337 // temporaries that we may have created as part of the evaluation of
9338 // the expression in that context: they aren't relevant because they
9339 // will never be constructed.
Richard Smithf6702a32011-12-20 02:08:33 +00009340 if (Rec.Context == Unevaluated || Rec.Context == ConstantEvaluated) {
John McCall80ee6e82011-11-10 05:35:25 +00009341 ExprCleanupObjects.erase(ExprCleanupObjects.begin() + Rec.NumCleanupObjects,
9342 ExprCleanupObjects.end());
John McCallf85e1932011-06-15 23:02:42 +00009343 ExprNeedsCleanups = Rec.ParentNeedsCleanups;
9344
9345 // Otherwise, merge the contexts together.
9346 } else {
9347 ExprNeedsCleanups |= Rec.ParentNeedsCleanups;
9348 }
Douglas Gregor2afce722009-11-26 00:44:06 +00009349
9350 // Destroy the popped expression evaluation record.
9351 Rec.Destroy();
Douglas Gregorac7610d2009-06-22 20:57:11 +00009352}
Douglas Gregore0762c92009-06-19 23:52:42 +00009353
John McCallf85e1932011-06-15 23:02:42 +00009354void Sema::DiscardCleanupsInEvaluationContext() {
John McCall80ee6e82011-11-10 05:35:25 +00009355 ExprCleanupObjects.erase(
9356 ExprCleanupObjects.begin() + ExprEvalContexts.back().NumCleanupObjects,
9357 ExprCleanupObjects.end());
John McCallf85e1932011-06-15 23:02:42 +00009358 ExprNeedsCleanups = false;
9359}
9360
Douglas Gregore0762c92009-06-19 23:52:42 +00009361/// \brief Note that the given declaration was referenced in the source code.
9362///
9363/// This routine should be invoke whenever a given declaration is referenced
9364/// in the source code, and where that reference occurred. If this declaration
9365/// reference means that the the declaration is used (C++ [basic.def.odr]p2,
9366/// C99 6.9p3), then the declaration will be marked as used.
9367///
9368/// \param Loc the location where the declaration was referenced.
9369///
9370/// \param D the declaration that has been referenced by the source code.
9371void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) {
9372 assert(D && "No declaration?");
Mike Stump1eb44332009-09-09 15:08:12 +00009373
Argyrios Kyrtzidis6b6b42a2011-04-19 19:51:10 +00009374 D->setReferenced();
9375
Douglas Gregorc070cc62010-06-17 23:14:26 +00009376 if (D->isUsed(false))
Douglas Gregord7f37bf2009-06-22 23:06:13 +00009377 return;
Mike Stump1eb44332009-09-09 15:08:12 +00009378
Douglas Gregorfc2ca562010-04-07 20:29:57 +00009379 if (!isa<VarDecl>(D) && !isa<FunctionDecl>(D))
9380 return;
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00009381
Douglas Gregore0762c92009-06-19 23:52:42 +00009382 // Do not mark anything as "used" within a dependent context; wait for
9383 // an instantiation.
9384 if (CurContext->isDependentContext())
9385 return;
Mike Stump1eb44332009-09-09 15:08:12 +00009386
Douglas Gregor2afce722009-11-26 00:44:06 +00009387 switch (ExprEvalContexts.back().Context) {
Douglas Gregorac7610d2009-06-22 20:57:11 +00009388 case Unevaluated:
9389 // We are in an expression that is not potentially evaluated; do nothing.
9390 return;
Mike Stump1eb44332009-09-09 15:08:12 +00009391
Richard Smithf6702a32011-12-20 02:08:33 +00009392 case ConstantEvaluated:
9393 // We are in an expression that will be evaluated during translation; in
9394 // C++11, we need to define any functions which are used in case they're
9395 // constexpr, whereas in C++98, we only need to define static data members
9396 // of class templates.
9397 if (!getLangOptions().CPlusPlus ||
9398 (!getLangOptions().CPlusPlus0x && !isa<VarDecl>(D)))
9399 return;
9400 break;
9401
Douglas Gregorac7610d2009-06-22 20:57:11 +00009402 case PotentiallyEvaluated:
9403 // We are in a potentially-evaluated expression, so this declaration is
9404 // "used"; handle this below.
9405 break;
Mike Stump1eb44332009-09-09 15:08:12 +00009406
Douglas Gregorac7610d2009-06-22 20:57:11 +00009407 case PotentiallyPotentiallyEvaluated:
9408 // We are in an expression that may be potentially evaluated; queue this
9409 // declaration reference until we know whether the expression is
9410 // potentially evaluated.
Douglas Gregor2afce722009-11-26 00:44:06 +00009411 ExprEvalContexts.back().addReferencedDecl(Loc, D);
Douglas Gregorac7610d2009-06-22 20:57:11 +00009412 return;
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009413
9414 case PotentiallyEvaluatedIfUsed:
9415 // Referenced declarations will only be used if the construct in the
9416 // containing expression is used.
9417 return;
Douglas Gregorac7610d2009-06-22 20:57:11 +00009418 }
Mike Stump1eb44332009-09-09 15:08:12 +00009419
Douglas Gregore0762c92009-06-19 23:52:42 +00009420 // Note that this declaration has been used.
Fariborz Jahanianb7f4cc02009-06-22 17:30:33 +00009421 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) {
Sebastian Redl85ea7aa2011-08-30 19:58:05 +00009422 if (Constructor->isDefaulted()) {
9423 if (Constructor->isDefaultConstructor()) {
9424 if (Constructor->isTrivial())
9425 return;
9426 if (!Constructor->isUsed(false))
9427 DefineImplicitDefaultConstructor(Loc, Constructor);
9428 } else if (Constructor->isCopyConstructor()) {
9429 if (!Constructor->isUsed(false))
9430 DefineImplicitCopyConstructor(Loc, Constructor);
9431 } else if (Constructor->isMoveConstructor()) {
9432 if (!Constructor->isUsed(false))
9433 DefineImplicitMoveConstructor(Loc, Constructor);
9434 }
Fariborz Jahanian485f0872009-06-22 23:34:40 +00009435 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009436
Douglas Gregor6fb745b2010-05-13 16:44:06 +00009437 MarkVTableUsed(Loc, Constructor->getParent());
Fariborz Jahanian8d2b3562009-06-26 23:49:16 +00009438 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) {
Sean Huntcb45a0f2011-05-12 22:46:25 +00009439 if (Destructor->isDefaulted() && !Destructor->isUsed(false))
Fariborz Jahanian8d2b3562009-06-26 23:49:16 +00009440 DefineImplicitDestructor(Loc, Destructor);
Douglas Gregor6fb745b2010-05-13 16:44:06 +00009441 if (Destructor->isVirtual())
9442 MarkVTableUsed(Loc, Destructor->getParent());
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +00009443 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) {
Sean Hunt2b188082011-05-14 05:23:28 +00009444 if (MethodDecl->isDefaulted() && MethodDecl->isOverloadedOperator() &&
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +00009445 MethodDecl->getOverloadedOperator() == OO_Equal) {
Sebastian Redl85ea7aa2011-08-30 19:58:05 +00009446 if (!MethodDecl->isUsed(false)) {
9447 if (MethodDecl->isCopyAssignmentOperator())
9448 DefineImplicitCopyAssignment(Loc, MethodDecl);
9449 else
9450 DefineImplicitMoveAssignment(Loc, MethodDecl);
9451 }
Douglas Gregor6fb745b2010-05-13 16:44:06 +00009452 } else if (MethodDecl->isVirtual())
9453 MarkVTableUsed(Loc, MethodDecl->getParent());
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +00009454 }
Fariborz Jahanianf5ed9e02009-06-24 22:09:44 +00009455 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
John McCall15e310a2011-02-19 02:53:41 +00009456 // Recursive functions should be marked when used from another function.
9457 if (CurContext == Function) return;
9458
Mike Stump1eb44332009-09-09 15:08:12 +00009459 // Implicit instantiation of function templates and member functions of
Douglas Gregor1637be72009-06-26 00:10:03 +00009460 // class templates.
Douglas Gregor6cfacfe2010-05-17 17:34:56 +00009461 if (Function->isImplicitlyInstantiable()) {
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009462 bool AlreadyInstantiated = false;
9463 if (FunctionTemplateSpecializationInfo *SpecInfo
9464 = Function->getTemplateSpecializationInfo()) {
9465 if (SpecInfo->getPointOfInstantiation().isInvalid())
9466 SpecInfo->setPointOfInstantiation(Loc);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009467 else if (SpecInfo->getTemplateSpecializationKind()
Douglas Gregor3b846b62009-10-27 20:53:28 +00009468 == TSK_ImplicitInstantiation)
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009469 AlreadyInstantiated = true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009470 } else if (MemberSpecializationInfo *MSInfo
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009471 = Function->getMemberSpecializationInfo()) {
9472 if (MSInfo->getPointOfInstantiation().isInvalid())
9473 MSInfo->setPointOfInstantiation(Loc);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009474 else if (MSInfo->getTemplateSpecializationKind()
Douglas Gregor3b846b62009-10-27 20:53:28 +00009475 == TSK_ImplicitInstantiation)
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009476 AlreadyInstantiated = true;
9477 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009478
Douglas Gregor60406be2010-01-16 22:29:39 +00009479 if (!AlreadyInstantiated) {
9480 if (isa<CXXRecordDecl>(Function->getDeclContext()) &&
9481 cast<CXXRecordDecl>(Function->getDeclContext())->isLocalClass())
9482 PendingLocalImplicitInstantiations.push_back(std::make_pair(Function,
9483 Loc));
Richard Smith1d238ea2011-12-21 02:55:12 +00009484 else if (Function->getTemplateInstantiationPattern()->isConstexpr())
9485 // Do not defer instantiations of constexpr functions, to avoid the
9486 // expression evaluator needing to call back into Sema if it sees a
9487 // call to such a function.
9488 InstantiateFunctionDefinition(Loc, Function);
Douglas Gregor60406be2010-01-16 22:29:39 +00009489 else
Chandler Carruth62c78d52010-08-25 08:44:16 +00009490 PendingInstantiations.push_back(std::make_pair(Function, Loc));
Douglas Gregor60406be2010-01-16 22:29:39 +00009491 }
John McCall15e310a2011-02-19 02:53:41 +00009492 } else {
9493 // Walk redefinitions, as some of them may be instantiable.
Gabor Greif40181c42010-08-28 00:16:06 +00009494 for (FunctionDecl::redecl_iterator i(Function->redecls_begin()),
9495 e(Function->redecls_end()); i != e; ++i) {
Gabor Greifbe9ebe32010-08-28 01:58:12 +00009496 if (!i->isUsed(false) && i->isImplicitlyInstantiable())
Gabor Greif40181c42010-08-28 00:16:06 +00009497 MarkDeclarationReferenced(Loc, *i);
9498 }
John McCall15e310a2011-02-19 02:53:41 +00009499 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009500
John McCall15e310a2011-02-19 02:53:41 +00009501 // Keep track of used but undefined functions.
9502 if (!Function->isPure() && !Function->hasBody() &&
9503 Function->getLinkage() != ExternalLinkage) {
9504 SourceLocation &old = UndefinedInternals[Function->getCanonicalDecl()];
9505 if (old.isInvalid()) old = Loc;
9506 }
Argyrios Kyrtzidis58b52592010-08-25 10:34:54 +00009507
John McCall15e310a2011-02-19 02:53:41 +00009508 Function->setUsed(true);
Douglas Gregore0762c92009-06-19 23:52:42 +00009509 return;
Douglas Gregord7f37bf2009-06-22 23:06:13 +00009510 }
Mike Stump1eb44332009-09-09 15:08:12 +00009511
Douglas Gregore0762c92009-06-19 23:52:42 +00009512 if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
Douglas Gregor7caa6822009-07-24 20:34:43 +00009513 // Implicit instantiation of static data members of class templates.
Mike Stump1eb44332009-09-09 15:08:12 +00009514 if (Var->isStaticDataMember() &&
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009515 Var->getInstantiatedFromStaticDataMember()) {
9516 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo();
9517 assert(MSInfo && "Missing member specialization information?");
9518 if (MSInfo->getPointOfInstantiation().isInvalid() &&
9519 MSInfo->getTemplateSpecializationKind()== TSK_ImplicitInstantiation) {
9520 MSInfo->setPointOfInstantiation(Loc);
Sebastian Redlf79a7192011-04-29 08:19:30 +00009521 // This is a modification of an existing AST node. Notify listeners.
9522 if (ASTMutationListener *L = getASTMutationListener())
9523 L->StaticDataMemberInstantiated(Var);
Richard Smith1d238ea2011-12-21 02:55:12 +00009524 if (Var->isUsableInConstantExpressions())
9525 // Do not defer instantiations of variables which could be used in a
9526 // constant expression.
Richard Smith3e9ea0b2011-12-21 00:25:33 +00009527 InstantiateStaticDataMemberDefinition(Loc, Var);
9528 else
9529 PendingInstantiations.push_back(std::make_pair(Var, Loc));
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00009530 }
9531 }
Mike Stump1eb44332009-09-09 15:08:12 +00009532
John McCall77efc682011-02-21 19:25:48 +00009533 // Keep track of used but undefined variables. We make a hole in
9534 // the warning for static const data members with in-line
9535 // initializers.
John McCall15e310a2011-02-19 02:53:41 +00009536 if (Var->hasDefinition() == VarDecl::DeclarationOnly
John McCall77efc682011-02-21 19:25:48 +00009537 && Var->getLinkage() != ExternalLinkage
9538 && !(Var->isStaticDataMember() && Var->hasInit())) {
John McCall15e310a2011-02-19 02:53:41 +00009539 SourceLocation &old = UndefinedInternals[Var->getCanonicalDecl()];
9540 if (old.isInvalid()) old = Loc;
9541 }
Douglas Gregor7caa6822009-07-24 20:34:43 +00009542
Douglas Gregore0762c92009-06-19 23:52:42 +00009543 D->setUsed(true);
Douglas Gregor7caa6822009-07-24 20:34:43 +00009544 return;
Sam Weinigcce6ebc2009-09-11 03:29:30 +00009545 }
Douglas Gregore0762c92009-06-19 23:52:42 +00009546}
Anders Carlsson8c8d9192009-10-09 23:51:55 +00009547
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009548namespace {
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009549 // Mark all of the declarations referenced
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009550 // FIXME: Not fully implemented yet! We need to have a better understanding
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009551 // of when we're entering
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009552 class MarkReferencedDecls : public RecursiveASTVisitor<MarkReferencedDecls> {
9553 Sema &S;
9554 SourceLocation Loc;
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009555
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009556 public:
9557 typedef RecursiveASTVisitor<MarkReferencedDecls> Inherited;
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009558
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009559 MarkReferencedDecls(Sema &S, SourceLocation Loc) : S(S), Loc(Loc) { }
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009560
9561 bool TraverseTemplateArgument(const TemplateArgument &Arg);
9562 bool TraverseRecordType(RecordType *T);
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009563 };
9564}
9565
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009566bool MarkReferencedDecls::TraverseTemplateArgument(
9567 const TemplateArgument &Arg) {
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009568 if (Arg.getKind() == TemplateArgument::Declaration) {
9569 S.MarkDeclarationReferenced(Loc, Arg.getAsDecl());
9570 }
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009571
9572 return Inherited::TraverseTemplateArgument(Arg);
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009573}
9574
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009575bool MarkReferencedDecls::TraverseRecordType(RecordType *T) {
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009576 if (ClassTemplateSpecializationDecl *Spec
9577 = dyn_cast<ClassTemplateSpecializationDecl>(T->getDecl())) {
9578 const TemplateArgumentList &Args = Spec->getTemplateArgs();
Douglas Gregor910f8002010-11-07 23:05:16 +00009579 return TraverseTemplateArguments(Args.data(), Args.size());
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009580 }
9581
Chandler Carruthe3e210c2010-06-10 10:31:57 +00009582 return true;
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009583}
9584
9585void Sema::MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T) {
9586 MarkReferencedDecls Marker(*this, Loc);
Chandler Carruthdfc35e32010-06-09 08:17:30 +00009587 Marker.TraverseType(Context.getCanonicalType(T));
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00009588}
9589
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009590namespace {
9591 /// \brief Helper class that marks all of the declarations referenced by
9592 /// potentially-evaluated subexpressions as "referenced".
9593 class EvaluatedExprMarker : public EvaluatedExprVisitor<EvaluatedExprMarker> {
9594 Sema &S;
9595
9596 public:
9597 typedef EvaluatedExprVisitor<EvaluatedExprMarker> Inherited;
9598
9599 explicit EvaluatedExprMarker(Sema &S) : Inherited(S.Context), S(S) { }
9600
9601 void VisitDeclRefExpr(DeclRefExpr *E) {
9602 S.MarkDeclarationReferenced(E->getLocation(), E->getDecl());
9603 }
9604
9605 void VisitMemberExpr(MemberExpr *E) {
9606 S.MarkDeclarationReferenced(E->getMemberLoc(), E->getMemberDecl());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00009607 Inherited::VisitMemberExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009608 }
9609
John McCall80ee6e82011-11-10 05:35:25 +00009610 void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
9611 S.MarkDeclarationReferenced(E->getLocStart(),
9612 const_cast<CXXDestructorDecl*>(E->getTemporary()->getDestructor()));
9613 Visit(E->getSubExpr());
9614 }
9615
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009616 void VisitCXXNewExpr(CXXNewExpr *E) {
9617 if (E->getConstructor())
9618 S.MarkDeclarationReferenced(E->getLocStart(), E->getConstructor());
9619 if (E->getOperatorNew())
9620 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorNew());
9621 if (E->getOperatorDelete())
9622 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorDelete());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00009623 Inherited::VisitCXXNewExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009624 }
9625
9626 void VisitCXXDeleteExpr(CXXDeleteExpr *E) {
9627 if (E->getOperatorDelete())
9628 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorDelete());
Douglas Gregor5833b0b2010-09-14 22:55:20 +00009629 QualType Destroyed = S.Context.getBaseElementType(E->getDestroyedType());
9630 if (const RecordType *DestroyedRec = Destroyed->getAs<RecordType>()) {
9631 CXXRecordDecl *Record = cast<CXXRecordDecl>(DestroyedRec->getDecl());
9632 S.MarkDeclarationReferenced(E->getLocStart(),
9633 S.LookupDestructor(Record));
9634 }
9635
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00009636 Inherited::VisitCXXDeleteExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009637 }
9638
9639 void VisitCXXConstructExpr(CXXConstructExpr *E) {
9640 S.MarkDeclarationReferenced(E->getLocStart(), E->getConstructor());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00009641 Inherited::VisitCXXConstructExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009642 }
9643
9644 void VisitBlockDeclRefExpr(BlockDeclRefExpr *E) {
9645 S.MarkDeclarationReferenced(E->getLocation(), E->getDecl());
9646 }
Douglas Gregor102ff972010-10-19 17:17:35 +00009647
9648 void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
9649 Visit(E->getExpr());
9650 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009651 };
9652}
9653
9654/// \brief Mark any declarations that appear within this expression or any
9655/// potentially-evaluated subexpressions as "referenced".
9656void Sema::MarkDeclarationsReferencedInExpr(Expr *E) {
9657 EvaluatedExprMarker(*this).Visit(E);
9658}
9659
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009660/// \brief Emit a diagnostic that describes an effect on the run-time behavior
9661/// of the program being compiled.
9662///
9663/// This routine emits the given diagnostic when the code currently being
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009664/// type-checked is "potentially evaluated", meaning that there is a
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009665/// possibility that the code will actually be executable. Code in sizeof()
9666/// expressions, code used only during overload resolution, etc., are not
9667/// potentially evaluated. This routine will suppress such diagnostics or,
9668/// in the absolutely nutty case of potentially potentially evaluated
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009669/// expressions (C++ typeid), queue the diagnostic to potentially emit it
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009670/// later.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009671///
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009672/// This routine should be used for all diagnostics that describe the run-time
9673/// behavior of a program, such as passing a non-POD value through an ellipsis.
9674/// Failure to do so will likely result in spurious diagnostics or failures
9675/// during overload resolution or within sizeof/alignof/typeof/typeid.
Richard Trieuccd891a2011-09-09 01:45:06 +00009676bool Sema::DiagRuntimeBehavior(SourceLocation Loc, const Stmt *Statement,
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009677 const PartialDiagnostic &PD) {
John McCallf85e1932011-06-15 23:02:42 +00009678 switch (ExprEvalContexts.back().Context) {
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009679 case Unevaluated:
9680 // The argument will never be evaluated, so don't complain.
9681 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009682
Richard Smithf6702a32011-12-20 02:08:33 +00009683 case ConstantEvaluated:
9684 // Relevant diagnostics should be produced by constant evaluation.
9685 break;
9686
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009687 case PotentiallyEvaluated:
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00009688 case PotentiallyEvaluatedIfUsed:
Richard Trieuccd891a2011-09-09 01:45:06 +00009689 if (Statement && getCurFunctionOrMethodDecl()) {
Ted Kremenek351ba912011-02-23 01:52:04 +00009690 FunctionScopes.back()->PossiblyUnreachableDiags.
Richard Trieuccd891a2011-09-09 01:45:06 +00009691 push_back(sema::PossiblyUnreachableDiag(PD, Loc, Statement));
Ted Kremenek351ba912011-02-23 01:52:04 +00009692 }
9693 else
9694 Diag(Loc, PD);
9695
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009696 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009697
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00009698 case PotentiallyPotentiallyEvaluated:
9699 ExprEvalContexts.back().addDiagnostic(Loc, PD);
9700 break;
9701 }
9702
9703 return false;
9704}
9705
Anders Carlsson8c8d9192009-10-09 23:51:55 +00009706bool Sema::CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
9707 CallExpr *CE, FunctionDecl *FD) {
9708 if (ReturnType->isVoidType() || !ReturnType->isIncompleteType())
9709 return false;
9710
9711 PartialDiagnostic Note =
9712 FD ? PDiag(diag::note_function_with_incomplete_return_type_declared_here)
9713 << FD->getDeclName() : PDiag();
9714 SourceLocation NoteLoc = FD ? FD->getLocation() : SourceLocation();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009715
Anders Carlsson8c8d9192009-10-09 23:51:55 +00009716 if (RequireCompleteType(Loc, ReturnType,
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009717 FD ?
Anders Carlsson8c8d9192009-10-09 23:51:55 +00009718 PDiag(diag::err_call_function_incomplete_return)
9719 << CE->getSourceRange() << FD->getDeclName() :
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00009720 PDiag(diag::err_call_incomplete_return)
Anders Carlsson8c8d9192009-10-09 23:51:55 +00009721 << CE->getSourceRange(),
9722 std::make_pair(NoteLoc, Note)))
9723 return true;
9724
9725 return false;
9726}
9727
Douglas Gregor92c3a042011-01-19 16:50:08 +00009728// Diagnose the s/=/==/ and s/\|=/!=/ typos. Note that adding parentheses
John McCall5a881bb2009-10-12 21:59:07 +00009729// will prevent this condition from triggering, which is what we want.
9730void Sema::DiagnoseAssignmentAsCondition(Expr *E) {
9731 SourceLocation Loc;
9732
John McCalla52ef082009-11-11 02:41:58 +00009733 unsigned diagnostic = diag::warn_condition_is_assignment;
Douglas Gregor92c3a042011-01-19 16:50:08 +00009734 bool IsOrAssign = false;
John McCalla52ef082009-11-11 02:41:58 +00009735
Chandler Carruthb33c19f2011-08-16 22:30:10 +00009736 if (BinaryOperator *Op = dyn_cast<BinaryOperator>(E)) {
Douglas Gregor92c3a042011-01-19 16:50:08 +00009737 if (Op->getOpcode() != BO_Assign && Op->getOpcode() != BO_OrAssign)
John McCall5a881bb2009-10-12 21:59:07 +00009738 return;
9739
Douglas Gregor92c3a042011-01-19 16:50:08 +00009740 IsOrAssign = Op->getOpcode() == BO_OrAssign;
9741
John McCallc8d8ac52009-11-12 00:06:05 +00009742 // Greylist some idioms by putting them into a warning subcategory.
9743 if (ObjCMessageExpr *ME
9744 = dyn_cast<ObjCMessageExpr>(Op->getRHS()->IgnoreParenCasts())) {
9745 Selector Sel = ME->getSelector();
9746
John McCallc8d8ac52009-11-12 00:06:05 +00009747 // self = [<foo> init...]
Douglas Gregorc737acb2011-09-27 16:10:05 +00009748 if (isSelfExpr(Op->getLHS()) && Sel.getNameForSlot(0).startswith("init"))
John McCallc8d8ac52009-11-12 00:06:05 +00009749 diagnostic = diag::warn_condition_is_idiomatic_assignment;
9750
9751 // <foo> = [<bar> nextObject]
Douglas Gregor813d8342011-02-18 22:29:55 +00009752 else if (Sel.isUnarySelector() && Sel.getNameForSlot(0) == "nextObject")
John McCallc8d8ac52009-11-12 00:06:05 +00009753 diagnostic = diag::warn_condition_is_idiomatic_assignment;
9754 }
John McCalla52ef082009-11-11 02:41:58 +00009755
John McCall5a881bb2009-10-12 21:59:07 +00009756 Loc = Op->getOperatorLoc();
Chandler Carruthb33c19f2011-08-16 22:30:10 +00009757 } else if (CXXOperatorCallExpr *Op = dyn_cast<CXXOperatorCallExpr>(E)) {
Douglas Gregor92c3a042011-01-19 16:50:08 +00009758 if (Op->getOperator() != OO_Equal && Op->getOperator() != OO_PipeEqual)
John McCall5a881bb2009-10-12 21:59:07 +00009759 return;
9760
Douglas Gregor92c3a042011-01-19 16:50:08 +00009761 IsOrAssign = Op->getOperator() == OO_PipeEqual;
John McCall5a881bb2009-10-12 21:59:07 +00009762 Loc = Op->getOperatorLoc();
9763 } else {
9764 // Not an assignment.
9765 return;
9766 }
9767
Douglas Gregor55b38842010-04-14 16:09:52 +00009768 Diag(Loc, diagnostic) << E->getSourceRange();
Douglas Gregor92c3a042011-01-19 16:50:08 +00009769
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +00009770 SourceLocation Open = E->getSourceRange().getBegin();
9771 SourceLocation Close = PP.getLocForEndOfToken(E->getSourceRange().getEnd());
9772 Diag(Loc, diag::note_condition_assign_silence)
9773 << FixItHint::CreateInsertion(Open, "(")
9774 << FixItHint::CreateInsertion(Close, ")");
9775
Douglas Gregor92c3a042011-01-19 16:50:08 +00009776 if (IsOrAssign)
9777 Diag(Loc, diag::note_condition_or_assign_to_comparison)
9778 << FixItHint::CreateReplacement(Loc, "!=");
9779 else
9780 Diag(Loc, diag::note_condition_assign_to_comparison)
9781 << FixItHint::CreateReplacement(Loc, "==");
John McCall5a881bb2009-10-12 21:59:07 +00009782}
9783
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +00009784/// \brief Redundant parentheses over an equality comparison can indicate
9785/// that the user intended an assignment used as condition.
Richard Trieuccd891a2011-09-09 01:45:06 +00009786void Sema::DiagnoseEqualityWithExtraParens(ParenExpr *ParenE) {
Argyrios Kyrtzidiscf1620a2011-02-01 22:23:56 +00009787 // Don't warn if the parens came from a macro.
Richard Trieuccd891a2011-09-09 01:45:06 +00009788 SourceLocation parenLoc = ParenE->getLocStart();
Argyrios Kyrtzidiscf1620a2011-02-01 22:23:56 +00009789 if (parenLoc.isInvalid() || parenLoc.isMacroID())
9790 return;
Argyrios Kyrtzidis170a6a22011-03-28 23:52:04 +00009791 // Don't warn for dependent expressions.
Richard Trieuccd891a2011-09-09 01:45:06 +00009792 if (ParenE->isTypeDependent())
Argyrios Kyrtzidis170a6a22011-03-28 23:52:04 +00009793 return;
Argyrios Kyrtzidiscf1620a2011-02-01 22:23:56 +00009794
Richard Trieuccd891a2011-09-09 01:45:06 +00009795 Expr *E = ParenE->IgnoreParens();
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +00009796
9797 if (BinaryOperator *opE = dyn_cast<BinaryOperator>(E))
Argyrios Kyrtzidis70f23302011-02-01 19:32:59 +00009798 if (opE->getOpcode() == BO_EQ &&
9799 opE->getLHS()->IgnoreParenImpCasts()->isModifiableLvalue(Context)
9800 == Expr::MLV_Valid) {
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +00009801 SourceLocation Loc = opE->getOperatorLoc();
Ted Kremenek006ae382011-02-01 22:36:09 +00009802
Ted Kremenekf7275cd2011-02-02 02:20:30 +00009803 Diag(Loc, diag::warn_equality_with_extra_parens) << E->getSourceRange();
Ted Kremenekf7275cd2011-02-02 02:20:30 +00009804 Diag(Loc, diag::note_equality_comparison_silence)
Richard Trieuccd891a2011-09-09 01:45:06 +00009805 << FixItHint::CreateRemoval(ParenE->getSourceRange().getBegin())
9806 << FixItHint::CreateRemoval(ParenE->getSourceRange().getEnd());
Argyrios Kyrtzidisabdd3b32011-04-25 23:01:29 +00009807 Diag(Loc, diag::note_equality_comparison_to_assign)
9808 << FixItHint::CreateReplacement(Loc, "=");
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +00009809 }
9810}
9811
John Wiegley429bb272011-04-08 18:41:53 +00009812ExprResult Sema::CheckBooleanCondition(Expr *E, SourceLocation Loc) {
John McCall5a881bb2009-10-12 21:59:07 +00009813 DiagnoseAssignmentAsCondition(E);
Argyrios Kyrtzidis0e2dc3a2011-02-01 18:24:22 +00009814 if (ParenExpr *parenE = dyn_cast<ParenExpr>(E))
9815 DiagnoseEqualityWithExtraParens(parenE);
John McCall5a881bb2009-10-12 21:59:07 +00009816
John McCall864c0412011-04-26 20:42:42 +00009817 ExprResult result = CheckPlaceholderExpr(E);
9818 if (result.isInvalid()) return ExprError();
9819 E = result.take();
Argyrios Kyrtzidis11ab7902010-11-01 18:49:26 +00009820
John McCall864c0412011-04-26 20:42:42 +00009821 if (!E->isTypeDependent()) {
John McCallf6a16482010-12-04 03:47:34 +00009822 if (getLangOptions().CPlusPlus)
9823 return CheckCXXBooleanCondition(E); // C++ 6.4p4
9824
John Wiegley429bb272011-04-08 18:41:53 +00009825 ExprResult ERes = DefaultFunctionArrayLvalueConversion(E);
9826 if (ERes.isInvalid())
9827 return ExprError();
9828 E = ERes.take();
John McCallabc56c72010-12-04 06:09:13 +00009829
9830 QualType T = E->getType();
John Wiegley429bb272011-04-08 18:41:53 +00009831 if (!T->isScalarType()) { // C99 6.8.4.1p1
9832 Diag(Loc, diag::err_typecheck_statement_requires_scalar)
9833 << T << E->getSourceRange();
9834 return ExprError();
9835 }
John McCall5a881bb2009-10-12 21:59:07 +00009836 }
9837
John Wiegley429bb272011-04-08 18:41:53 +00009838 return Owned(E);
John McCall5a881bb2009-10-12 21:59:07 +00009839}
Douglas Gregor586596f2010-05-06 17:25:47 +00009840
John McCall60d7b3a2010-08-24 06:29:42 +00009841ExprResult Sema::ActOnBooleanCondition(Scope *S, SourceLocation Loc,
Richard Trieuccd891a2011-09-09 01:45:06 +00009842 Expr *SubExpr) {
9843 if (!SubExpr)
Douglas Gregor586596f2010-05-06 17:25:47 +00009844 return ExprError();
John Wiegley429bb272011-04-08 18:41:53 +00009845
Richard Trieuccd891a2011-09-09 01:45:06 +00009846 return CheckBooleanCondition(SubExpr, Loc);
Douglas Gregor586596f2010-05-06 17:25:47 +00009847}
John McCall2a984ca2010-10-12 00:20:44 +00009848
John McCall1de4d4e2011-04-07 08:22:57 +00009849namespace {
John McCall755d8492011-04-12 00:42:48 +00009850 /// A visitor for rebuilding a call to an __unknown_any expression
9851 /// to have an appropriate type.
9852 struct RebuildUnknownAnyFunction
9853 : StmtVisitor<RebuildUnknownAnyFunction, ExprResult> {
9854
9855 Sema &S;
9856
9857 RebuildUnknownAnyFunction(Sema &S) : S(S) {}
9858
9859 ExprResult VisitStmt(Stmt *S) {
9860 llvm_unreachable("unexpected statement!");
9861 return ExprError();
9862 }
9863
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009864 ExprResult VisitExpr(Expr *E) {
9865 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_call)
9866 << E->getSourceRange();
John McCall755d8492011-04-12 00:42:48 +00009867 return ExprError();
9868 }
9869
9870 /// Rebuild an expression which simply semantically wraps another
9871 /// expression which it shares the type and value kind of.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009872 template <class T> ExprResult rebuildSugarExpr(T *E) {
9873 ExprResult SubResult = Visit(E->getSubExpr());
9874 if (SubResult.isInvalid()) return ExprError();
John McCall755d8492011-04-12 00:42:48 +00009875
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009876 Expr *SubExpr = SubResult.take();
9877 E->setSubExpr(SubExpr);
9878 E->setType(SubExpr->getType());
9879 E->setValueKind(SubExpr->getValueKind());
9880 assert(E->getObjectKind() == OK_Ordinary);
9881 return E;
John McCall755d8492011-04-12 00:42:48 +00009882 }
9883
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009884 ExprResult VisitParenExpr(ParenExpr *E) {
9885 return rebuildSugarExpr(E);
John McCall755d8492011-04-12 00:42:48 +00009886 }
9887
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009888 ExprResult VisitUnaryExtension(UnaryOperator *E) {
9889 return rebuildSugarExpr(E);
John McCall755d8492011-04-12 00:42:48 +00009890 }
9891
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009892 ExprResult VisitUnaryAddrOf(UnaryOperator *E) {
9893 ExprResult SubResult = Visit(E->getSubExpr());
9894 if (SubResult.isInvalid()) return ExprError();
John McCall755d8492011-04-12 00:42:48 +00009895
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009896 Expr *SubExpr = SubResult.take();
9897 E->setSubExpr(SubExpr);
9898 E->setType(S.Context.getPointerType(SubExpr->getType()));
9899 assert(E->getValueKind() == VK_RValue);
9900 assert(E->getObjectKind() == OK_Ordinary);
9901 return E;
John McCall755d8492011-04-12 00:42:48 +00009902 }
9903
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009904 ExprResult resolveDecl(Expr *E, ValueDecl *VD) {
9905 if (!isa<FunctionDecl>(VD)) return VisitExpr(E);
John McCall755d8492011-04-12 00:42:48 +00009906
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009907 E->setType(VD->getType());
John McCall755d8492011-04-12 00:42:48 +00009908
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009909 assert(E->getValueKind() == VK_RValue);
John McCall755d8492011-04-12 00:42:48 +00009910 if (S.getLangOptions().CPlusPlus &&
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009911 !(isa<CXXMethodDecl>(VD) &&
9912 cast<CXXMethodDecl>(VD)->isInstance()))
9913 E->setValueKind(VK_LValue);
John McCall755d8492011-04-12 00:42:48 +00009914
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009915 return E;
John McCall755d8492011-04-12 00:42:48 +00009916 }
9917
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009918 ExprResult VisitMemberExpr(MemberExpr *E) {
9919 return resolveDecl(E, E->getMemberDecl());
John McCall755d8492011-04-12 00:42:48 +00009920 }
9921
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009922 ExprResult VisitDeclRefExpr(DeclRefExpr *E) {
9923 return resolveDecl(E, E->getDecl());
John McCall755d8492011-04-12 00:42:48 +00009924 }
9925 };
9926}
9927
9928/// Given a function expression of unknown-any type, try to rebuild it
9929/// to have a function type.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009930static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *FunctionExpr) {
9931 ExprResult Result = RebuildUnknownAnyFunction(S).Visit(FunctionExpr);
9932 if (Result.isInvalid()) return ExprError();
9933 return S.DefaultFunctionArrayConversion(Result.take());
John McCall755d8492011-04-12 00:42:48 +00009934}
9935
9936namespace {
John McCall379b5152011-04-11 07:02:50 +00009937 /// A visitor for rebuilding an expression of type __unknown_anytype
9938 /// into one which resolves the type directly on the referring
9939 /// expression. Strict preservation of the original source
9940 /// structure is not a goal.
John McCall1de4d4e2011-04-07 08:22:57 +00009941 struct RebuildUnknownAnyExpr
John McCalla5fc4722011-04-09 22:50:59 +00009942 : StmtVisitor<RebuildUnknownAnyExpr, ExprResult> {
John McCall1de4d4e2011-04-07 08:22:57 +00009943
9944 Sema &S;
9945
9946 /// The current destination type.
9947 QualType DestType;
9948
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009949 RebuildUnknownAnyExpr(Sema &S, QualType CastType)
9950 : S(S), DestType(CastType) {}
John McCall1de4d4e2011-04-07 08:22:57 +00009951
John McCalla5fc4722011-04-09 22:50:59 +00009952 ExprResult VisitStmt(Stmt *S) {
John McCall379b5152011-04-11 07:02:50 +00009953 llvm_unreachable("unexpected statement!");
John McCalla5fc4722011-04-09 22:50:59 +00009954 return ExprError();
John McCall1de4d4e2011-04-07 08:22:57 +00009955 }
9956
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009957 ExprResult VisitExpr(Expr *E) {
9958 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_expr)
9959 << E->getSourceRange();
John McCall379b5152011-04-11 07:02:50 +00009960 return ExprError();
John McCall1de4d4e2011-04-07 08:22:57 +00009961 }
9962
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009963 ExprResult VisitCallExpr(CallExpr *E);
9964 ExprResult VisitObjCMessageExpr(ObjCMessageExpr *E);
John McCall379b5152011-04-11 07:02:50 +00009965
John McCalla5fc4722011-04-09 22:50:59 +00009966 /// Rebuild an expression which simply semantically wraps another
9967 /// expression which it shares the type and value kind of.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009968 template <class T> ExprResult rebuildSugarExpr(T *E) {
9969 ExprResult SubResult = Visit(E->getSubExpr());
9970 if (SubResult.isInvalid()) return ExprError();
9971 Expr *SubExpr = SubResult.take();
9972 E->setSubExpr(SubExpr);
9973 E->setType(SubExpr->getType());
9974 E->setValueKind(SubExpr->getValueKind());
9975 assert(E->getObjectKind() == OK_Ordinary);
9976 return E;
John McCalla5fc4722011-04-09 22:50:59 +00009977 }
John McCall1de4d4e2011-04-07 08:22:57 +00009978
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009979 ExprResult VisitParenExpr(ParenExpr *E) {
9980 return rebuildSugarExpr(E);
John McCalla5fc4722011-04-09 22:50:59 +00009981 }
9982
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009983 ExprResult VisitUnaryExtension(UnaryOperator *E) {
9984 return rebuildSugarExpr(E);
John McCalla5fc4722011-04-09 22:50:59 +00009985 }
9986
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009987 ExprResult VisitUnaryAddrOf(UnaryOperator *E) {
9988 const PointerType *Ptr = DestType->getAs<PointerType>();
9989 if (!Ptr) {
9990 S.Diag(E->getOperatorLoc(), diag::err_unknown_any_addrof)
9991 << E->getSourceRange();
John McCall755d8492011-04-12 00:42:48 +00009992 return ExprError();
9993 }
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009994 assert(E->getValueKind() == VK_RValue);
9995 assert(E->getObjectKind() == OK_Ordinary);
9996 E->setType(DestType);
John McCall755d8492011-04-12 00:42:48 +00009997
9998 // Build the sub-expression as if it were an object of the pointee type.
Richard Trieu5e4c80b2011-09-09 03:59:41 +00009999 DestType = Ptr->getPointeeType();
10000 ExprResult SubResult = Visit(E->getSubExpr());
10001 if (SubResult.isInvalid()) return ExprError();
10002 E->setSubExpr(SubResult.take());
10003 return E;
John McCall755d8492011-04-12 00:42:48 +000010004 }
10005
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010006 ExprResult VisitImplicitCastExpr(ImplicitCastExpr *E);
John McCalla5fc4722011-04-09 22:50:59 +000010007
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010008 ExprResult resolveDecl(Expr *E, ValueDecl *VD);
John McCalla5fc4722011-04-09 22:50:59 +000010009
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010010 ExprResult VisitMemberExpr(MemberExpr *E) {
10011 return resolveDecl(E, E->getMemberDecl());
John McCall755d8492011-04-12 00:42:48 +000010012 }
John McCalla5fc4722011-04-09 22:50:59 +000010013
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010014 ExprResult VisitDeclRefExpr(DeclRefExpr *E) {
10015 return resolveDecl(E, E->getDecl());
John McCall1de4d4e2011-04-07 08:22:57 +000010016 }
10017 };
10018}
10019
John McCall379b5152011-04-11 07:02:50 +000010020/// Rebuilds a call expression which yielded __unknown_anytype.
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010021ExprResult RebuildUnknownAnyExpr::VisitCallExpr(CallExpr *E) {
10022 Expr *CalleeExpr = E->getCallee();
John McCall379b5152011-04-11 07:02:50 +000010023
10024 enum FnKind {
John McCallf5307512011-04-27 00:36:17 +000010025 FK_MemberFunction,
John McCall379b5152011-04-11 07:02:50 +000010026 FK_FunctionPointer,
10027 FK_BlockPointer
10028 };
10029
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010030 FnKind Kind;
10031 QualType CalleeType = CalleeExpr->getType();
10032 if (CalleeType == S.Context.BoundMemberTy) {
10033 assert(isa<CXXMemberCallExpr>(E) || isa<CXXOperatorCallExpr>(E));
10034 Kind = FK_MemberFunction;
10035 CalleeType = Expr::findBoundMemberType(CalleeExpr);
10036 } else if (const PointerType *Ptr = CalleeType->getAs<PointerType>()) {
10037 CalleeType = Ptr->getPointeeType();
10038 Kind = FK_FunctionPointer;
John McCall379b5152011-04-11 07:02:50 +000010039 } else {
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010040 CalleeType = CalleeType->castAs<BlockPointerType>()->getPointeeType();
10041 Kind = FK_BlockPointer;
John McCall379b5152011-04-11 07:02:50 +000010042 }
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010043 const FunctionType *FnType = CalleeType->castAs<FunctionType>();
John McCall379b5152011-04-11 07:02:50 +000010044
10045 // Verify that this is a legal result type of a function.
10046 if (DestType->isArrayType() || DestType->isFunctionType()) {
10047 unsigned diagID = diag::err_func_returning_array_function;
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010048 if (Kind == FK_BlockPointer)
John McCall379b5152011-04-11 07:02:50 +000010049 diagID = diag::err_block_returning_array_function;
10050
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010051 S.Diag(E->getExprLoc(), diagID)
John McCall379b5152011-04-11 07:02:50 +000010052 << DestType->isFunctionType() << DestType;
10053 return ExprError();
10054 }
10055
10056 // Otherwise, go ahead and set DestType as the call's result.
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010057 E->setType(DestType.getNonLValueExprType(S.Context));
10058 E->setValueKind(Expr::getValueKindForType(DestType));
10059 assert(E->getObjectKind() == OK_Ordinary);
John McCall379b5152011-04-11 07:02:50 +000010060
10061 // Rebuild the function type, replacing the result type with DestType.
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010062 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FnType))
John McCall379b5152011-04-11 07:02:50 +000010063 DestType = S.Context.getFunctionType(DestType,
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010064 Proto->arg_type_begin(),
10065 Proto->getNumArgs(),
10066 Proto->getExtProtoInfo());
John McCall379b5152011-04-11 07:02:50 +000010067 else
10068 DestType = S.Context.getFunctionNoProtoType(DestType,
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010069 FnType->getExtInfo());
John McCall379b5152011-04-11 07:02:50 +000010070
10071 // Rebuild the appropriate pointer-to-function type.
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010072 switch (Kind) {
John McCallf5307512011-04-27 00:36:17 +000010073 case FK_MemberFunction:
John McCall379b5152011-04-11 07:02:50 +000010074 // Nothing to do.
10075 break;
10076
10077 case FK_FunctionPointer:
10078 DestType = S.Context.getPointerType(DestType);
10079 break;
10080
10081 case FK_BlockPointer:
10082 DestType = S.Context.getBlockPointerType(DestType);
10083 break;
10084 }
10085
10086 // Finally, we can recurse.
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010087 ExprResult CalleeResult = Visit(CalleeExpr);
10088 if (!CalleeResult.isUsable()) return ExprError();
10089 E->setCallee(CalleeResult.take());
John McCall379b5152011-04-11 07:02:50 +000010090
10091 // Bind a temporary if necessary.
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010092 return S.MaybeBindToTemporary(E);
John McCall379b5152011-04-11 07:02:50 +000010093}
10094
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010095ExprResult RebuildUnknownAnyExpr::VisitObjCMessageExpr(ObjCMessageExpr *E) {
John McCall755d8492011-04-12 00:42:48 +000010096 // Verify that this is a legal result type of a call.
10097 if (DestType->isArrayType() || DestType->isFunctionType()) {
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010098 S.Diag(E->getExprLoc(), diag::err_func_returning_array_function)
John McCall755d8492011-04-12 00:42:48 +000010099 << DestType->isFunctionType() << DestType;
10100 return ExprError();
John McCall379b5152011-04-11 07:02:50 +000010101 }
10102
John McCall48218c62011-07-13 17:56:40 +000010103 // Rewrite the method result type if available.
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010104 if (ObjCMethodDecl *Method = E->getMethodDecl()) {
10105 assert(Method->getResultType() == S.Context.UnknownAnyTy);
10106 Method->setResultType(DestType);
John McCall48218c62011-07-13 17:56:40 +000010107 }
John McCall755d8492011-04-12 00:42:48 +000010108
John McCall379b5152011-04-11 07:02:50 +000010109 // Change the type of the message.
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010110 E->setType(DestType.getNonReferenceType());
10111 E->setValueKind(Expr::getValueKindForType(DestType));
John McCall379b5152011-04-11 07:02:50 +000010112
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010113 return S.MaybeBindToTemporary(E);
John McCall379b5152011-04-11 07:02:50 +000010114}
10115
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010116ExprResult RebuildUnknownAnyExpr::VisitImplicitCastExpr(ImplicitCastExpr *E) {
John McCall755d8492011-04-12 00:42:48 +000010117 // The only case we should ever see here is a function-to-pointer decay.
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010118 assert(E->getCastKind() == CK_FunctionToPointerDecay);
10119 assert(E->getValueKind() == VK_RValue);
10120 assert(E->getObjectKind() == OK_Ordinary);
John McCall379b5152011-04-11 07:02:50 +000010121
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010122 E->setType(DestType);
John McCall755d8492011-04-12 00:42:48 +000010123
John McCall379b5152011-04-11 07:02:50 +000010124 // Rebuild the sub-expression as the pointee (function) type.
10125 DestType = DestType->castAs<PointerType>()->getPointeeType();
10126
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010127 ExprResult Result = Visit(E->getSubExpr());
10128 if (!Result.isUsable()) return ExprError();
John McCall379b5152011-04-11 07:02:50 +000010129
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010130 E->setSubExpr(Result.take());
10131 return S.Owned(E);
John McCall379b5152011-04-11 07:02:50 +000010132}
10133
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010134ExprResult RebuildUnknownAnyExpr::resolveDecl(Expr *E, ValueDecl *VD) {
10135 ExprValueKind ValueKind = VK_LValue;
10136 QualType Type = DestType;
John McCall379b5152011-04-11 07:02:50 +000010137
10138 // We know how to make this work for certain kinds of decls:
10139
10140 // - functions
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010141 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(VD)) {
10142 if (const PointerType *Ptr = Type->getAs<PointerType>()) {
10143 DestType = Ptr->getPointeeType();
10144 ExprResult Result = resolveDecl(E, VD);
10145 if (Result.isInvalid()) return ExprError();
10146 return S.ImpCastExprToType(Result.take(), Type,
John McCalla19950e2011-08-10 04:12:23 +000010147 CK_FunctionToPointerDecay, VK_RValue);
10148 }
10149
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010150 if (!Type->isFunctionType()) {
10151 S.Diag(E->getExprLoc(), diag::err_unknown_any_function)
10152 << VD << E->getSourceRange();
John McCalla19950e2011-08-10 04:12:23 +000010153 return ExprError();
10154 }
John McCall379b5152011-04-11 07:02:50 +000010155
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010156 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
10157 if (MD->isInstance()) {
10158 ValueKind = VK_RValue;
10159 Type = S.Context.BoundMemberTy;
John McCallf5307512011-04-27 00:36:17 +000010160 }
10161
John McCall379b5152011-04-11 07:02:50 +000010162 // Function references aren't l-values in C.
10163 if (!S.getLangOptions().CPlusPlus)
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010164 ValueKind = VK_RValue;
John McCall379b5152011-04-11 07:02:50 +000010165
10166 // - variables
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010167 } else if (isa<VarDecl>(VD)) {
10168 if (const ReferenceType *RefTy = Type->getAs<ReferenceType>()) {
10169 Type = RefTy->getPointeeType();
10170 } else if (Type->isFunctionType()) {
10171 S.Diag(E->getExprLoc(), diag::err_unknown_any_var_function_type)
10172 << VD << E->getSourceRange();
John McCall755d8492011-04-12 00:42:48 +000010173 return ExprError();
John McCall379b5152011-04-11 07:02:50 +000010174 }
10175
10176 // - nothing else
10177 } else {
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010178 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_decl)
10179 << VD << E->getSourceRange();
John McCall379b5152011-04-11 07:02:50 +000010180 return ExprError();
10181 }
10182
Richard Trieu5e4c80b2011-09-09 03:59:41 +000010183 VD->setType(DestType);
10184 E->setType(Type);
10185 E->setValueKind(ValueKind);
10186 return S.Owned(E);
John McCall379b5152011-04-11 07:02:50 +000010187}
10188
John McCall1de4d4e2011-04-07 08:22:57 +000010189/// Check a cast of an unknown-any type. We intentionally only
10190/// trigger this for C-style casts.
Richard Trieuccd891a2011-09-09 01:45:06 +000010191ExprResult Sema::checkUnknownAnyCast(SourceRange TypeRange, QualType CastType,
10192 Expr *CastExpr, CastKind &CastKind,
10193 ExprValueKind &VK, CXXCastPath &Path) {
John McCall1de4d4e2011-04-07 08:22:57 +000010194 // Rewrite the casted expression from scratch.
Richard Trieuccd891a2011-09-09 01:45:06 +000010195 ExprResult result = RebuildUnknownAnyExpr(*this, CastType).Visit(CastExpr);
John McCalla5fc4722011-04-09 22:50:59 +000010196 if (!result.isUsable()) return ExprError();
John McCall1de4d4e2011-04-07 08:22:57 +000010197
Richard Trieuccd891a2011-09-09 01:45:06 +000010198 CastExpr = result.take();
10199 VK = CastExpr->getValueKind();
10200 CastKind = CK_NoOp;
John McCalla5fc4722011-04-09 22:50:59 +000010201
Richard Trieuccd891a2011-09-09 01:45:06 +000010202 return CastExpr;
John McCall1de4d4e2011-04-07 08:22:57 +000010203}
10204
Douglas Gregorf1d1ca52011-12-01 01:37:36 +000010205ExprResult Sema::forceUnknownAnyToType(Expr *E, QualType ToType) {
10206 return RebuildUnknownAnyExpr(*this, ToType).Visit(E);
10207}
10208
Richard Trieuccd891a2011-09-09 01:45:06 +000010209static ExprResult diagnoseUnknownAnyExpr(Sema &S, Expr *E) {
10210 Expr *orig = E;
John McCall379b5152011-04-11 07:02:50 +000010211 unsigned diagID = diag::err_uncasted_use_of_unknown_any;
John McCall1de4d4e2011-04-07 08:22:57 +000010212 while (true) {
Richard Trieuccd891a2011-09-09 01:45:06 +000010213 E = E->IgnoreParenImpCasts();
10214 if (CallExpr *call = dyn_cast<CallExpr>(E)) {
10215 E = call->getCallee();
John McCall379b5152011-04-11 07:02:50 +000010216 diagID = diag::err_uncasted_call_of_unknown_any;
10217 } else {
John McCall1de4d4e2011-04-07 08:22:57 +000010218 break;
John McCall379b5152011-04-11 07:02:50 +000010219 }
John McCall1de4d4e2011-04-07 08:22:57 +000010220 }
10221
John McCall379b5152011-04-11 07:02:50 +000010222 SourceLocation loc;
10223 NamedDecl *d;
Richard Trieuccd891a2011-09-09 01:45:06 +000010224 if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(E)) {
John McCall379b5152011-04-11 07:02:50 +000010225 loc = ref->getLocation();
10226 d = ref->getDecl();
Richard Trieuccd891a2011-09-09 01:45:06 +000010227 } else if (MemberExpr *mem = dyn_cast<MemberExpr>(E)) {
John McCall379b5152011-04-11 07:02:50 +000010228 loc = mem->getMemberLoc();
10229 d = mem->getMemberDecl();
Richard Trieuccd891a2011-09-09 01:45:06 +000010230 } else if (ObjCMessageExpr *msg = dyn_cast<ObjCMessageExpr>(E)) {
John McCall379b5152011-04-11 07:02:50 +000010231 diagID = diag::err_uncasted_call_of_unknown_any;
Argyrios Kyrtzidis20718082011-10-03 06:36:51 +000010232 loc = msg->getSelectorStartLoc();
John McCall379b5152011-04-11 07:02:50 +000010233 d = msg->getMethodDecl();
John McCall819e7452011-08-31 20:57:36 +000010234 if (!d) {
10235 S.Diag(loc, diag::err_uncasted_send_to_unknown_any_method)
10236 << static_cast<unsigned>(msg->isClassMessage()) << msg->getSelector()
10237 << orig->getSourceRange();
10238 return ExprError();
10239 }
John McCall379b5152011-04-11 07:02:50 +000010240 } else {
Richard Trieuccd891a2011-09-09 01:45:06 +000010241 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_expr)
10242 << E->getSourceRange();
John McCall379b5152011-04-11 07:02:50 +000010243 return ExprError();
10244 }
10245
10246 S.Diag(loc, diagID) << d << orig->getSourceRange();
John McCall1de4d4e2011-04-07 08:22:57 +000010247
10248 // Never recoverable.
10249 return ExprError();
10250}
10251
John McCall2a984ca2010-10-12 00:20:44 +000010252/// Check for operands with placeholder types and complain if found.
10253/// Returns true if there was an error and no recovery was possible.
John McCallfb8721c2011-04-10 19:13:55 +000010254ExprResult Sema::CheckPlaceholderExpr(Expr *E) {
John McCall5acb0c92011-10-17 18:40:02 +000010255 const BuiltinType *placeholderType = E->getType()->getAsPlaceholderType();
10256 if (!placeholderType) return Owned(E);
10257
10258 switch (placeholderType->getKind()) {
John McCall2a984ca2010-10-12 00:20:44 +000010259
John McCall1de4d4e2011-04-07 08:22:57 +000010260 // Overloaded expressions.
John McCall5acb0c92011-10-17 18:40:02 +000010261 case BuiltinType::Overload: {
John McCall6dbba4f2011-10-11 23:14:30 +000010262 // Try to resolve a single function template specialization.
10263 // This is obligatory.
10264 ExprResult result = Owned(E);
10265 if (ResolveAndFixSingleFunctionTemplateSpecialization(result, false)) {
10266 return result;
10267
10268 // If that failed, try to recover with a call.
10269 } else {
10270 tryToRecoverWithCall(result, PDiag(diag::err_ovl_unresolvable),
10271 /*complain*/ true);
10272 return result;
10273 }
10274 }
John McCall1de4d4e2011-04-07 08:22:57 +000010275
John McCall864c0412011-04-26 20:42:42 +000010276 // Bound member functions.
John McCall5acb0c92011-10-17 18:40:02 +000010277 case BuiltinType::BoundMember: {
John McCall6dbba4f2011-10-11 23:14:30 +000010278 ExprResult result = Owned(E);
10279 tryToRecoverWithCall(result, PDiag(diag::err_bound_member_function),
10280 /*complain*/ true);
10281 return result;
John McCall5acb0c92011-10-17 18:40:02 +000010282 }
10283
10284 // ARC unbridged casts.
10285 case BuiltinType::ARCUnbridgedCast: {
10286 Expr *realCast = stripARCUnbridgedCast(E);
10287 diagnoseARCUnbridgedCast(realCast);
10288 return Owned(realCast);
10289 }
John McCall864c0412011-04-26 20:42:42 +000010290
John McCall1de4d4e2011-04-07 08:22:57 +000010291 // Expressions of unknown type.
John McCall5acb0c92011-10-17 18:40:02 +000010292 case BuiltinType::UnknownAny:
John McCall1de4d4e2011-04-07 08:22:57 +000010293 return diagnoseUnknownAnyExpr(*this, E);
10294
John McCall3c3b7f92011-10-25 17:37:35 +000010295 // Pseudo-objects.
10296 case BuiltinType::PseudoObject:
10297 return checkPseudoObjectRValue(E);
10298
John McCalle0a22d02011-10-18 21:02:43 +000010299 // Everything else should be impossible.
10300#define BUILTIN_TYPE(Id, SingletonId) \
10301 case BuiltinType::Id:
10302#define PLACEHOLDER_TYPE(Id, SingletonId)
10303#include "clang/AST/BuiltinTypes.def"
John McCall5acb0c92011-10-17 18:40:02 +000010304 break;
10305 }
10306
10307 llvm_unreachable("invalid placeholder type!");
John McCall2a984ca2010-10-12 00:20:44 +000010308}
Richard Trieubb9b80c2011-04-21 21:44:26 +000010309
Richard Trieuccd891a2011-09-09 01:45:06 +000010310bool Sema::CheckCaseExpression(Expr *E) {
10311 if (E->isTypeDependent())
Richard Trieubb9b80c2011-04-21 21:44:26 +000010312 return true;
Richard Trieuccd891a2011-09-09 01:45:06 +000010313 if (E->isValueDependent() || E->isIntegerConstantExpr(Context))
10314 return E->getType()->isIntegralOrEnumerationType();
Richard Trieubb9b80c2011-04-21 21:44:26 +000010315 return false;
10316}