1 //===--- SemaExprCXX.cpp - Semantic Analysis for Expressions --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements semantic analysis for C++ expressions.
12 //===----------------------------------------------------------------------===//
17 #include "clang/AST/ASTContext.h"
18 #include "clang/AST/CXXInheritance.h"
19 #include "clang/AST/ExprCXX.h"
20 #include "clang/Basic/PartialDiagnostic.h"
21 #include "clang/Basic/TargetInfo.h"
22 #include "clang/Lex/Preprocessor.h"
23 #include "clang/Parse/DeclSpec.h"
24 #include "llvm/ADT/STLExtras.h"
25 using namespace clang;
27 /// ActOnCXXTypeidOfType - Parse typeid( type-id ).
28 Action::OwningExprResult
29 Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc,
30 bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
32 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
35 // C++ [expr.typeid]p4:
36 // The top-level cv-qualifiers of the lvalue expression or the type-id
37 // that is the operand of typeid are always ignored.
38 // FIXME: Preserve type source info.
39 // FIXME: Preserve the type before we stripped the cv-qualifiers?
40 QualType T = GetTypeFromParser(TyOrExpr);
44 // C++ [expr.typeid]p4:
45 // If the type of the type-id is a class type or a reference to a class
46 // type, the class shall be completely-defined.
48 if (const ReferenceType *RefType = CheckT->getAs<ReferenceType>())
49 CheckT = RefType->getPointeeType();
51 if (CheckT->getAs<RecordType>() &&
52 RequireCompleteType(OpLoc, CheckT, diag::err_incomplete_typeid))
55 TyOrExpr = T.getUnqualifiedType().getAsOpaquePtr();
58 IdentifierInfo *TypeInfoII = &PP.getIdentifierTable().get("type_info");
59 LookupResult R(*this, TypeInfoII, SourceLocation(), LookupTagName);
60 LookupQualifiedName(R, StdNamespace);
61 RecordDecl *TypeInfoRecordDecl = R.getAsSingle<RecordDecl>();
62 if (!TypeInfoRecordDecl)
63 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
65 QualType TypeInfoType = Context.getTypeDeclType(TypeInfoRecordDecl);
68 bool isUnevaluatedOperand = true;
69 Expr *E = static_cast<Expr *>(TyOrExpr);
70 if (E && !E->isTypeDependent()) {
71 QualType T = E->getType();
72 if (const RecordType *RecordT = T->getAs<RecordType>()) {
73 CXXRecordDecl *RecordD = cast<CXXRecordDecl>(RecordT->getDecl());
74 // C++ [expr.typeid]p3:
75 // When typeid is applied to an expression other than an lvalue of a
76 // polymorphic class type [...] [the] expression is an unevaluated
78 if (RecordD->isPolymorphic() && E->isLvalue(Context) == Expr::LV_Valid)
79 isUnevaluatedOperand = false;
81 // C++ [expr.typeid]p3:
82 // [...] If the type of the expression is a class type, the class
83 // shall be completely-defined.
84 if (RequireCompleteType(OpLoc, T, diag::err_incomplete_typeid))
89 // C++ [expr.typeid]p4:
90 // [...] If the type of the type-id is a reference to a possibly
91 // cv-qualified type, the result of the typeid expression refers to a
92 // std::type_info object representing the cv-unqualified referenced
94 if (T.hasQualifiers()) {
95 ImpCastExprToType(E, T.getUnqualifiedType(), CastExpr::CK_NoOp,
96 E->isLvalue(Context));
101 // If this is an unevaluated operand, clear out the set of
102 // declaration references we have been computing and eliminate any
103 // temporaries introduced in its computation.
104 if (isUnevaluatedOperand)
105 ExprEvalContexts.back().Context = Unevaluated;
108 return Owned(new (Context) CXXTypeidExpr(isType, TyOrExpr,
109 TypeInfoType.withConst(),
110 SourceRange(OpLoc, RParenLoc)));
113 /// ActOnCXXBoolLiteral - Parse {true,false} literals.
114 Action::OwningExprResult
115 Sema::ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
116 assert((Kind == tok::kw_true || Kind == tok::kw_false) &&
117 "Unknown C++ Boolean value!");
118 return Owned(new (Context) CXXBoolLiteralExpr(Kind == tok::kw_true,
119 Context.BoolTy, OpLoc));
122 /// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
123 Action::OwningExprResult
124 Sema::ActOnCXXNullPtrLiteral(SourceLocation Loc) {
125 return Owned(new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc));
128 /// ActOnCXXThrow - Parse throw expressions.
129 Action::OwningExprResult
130 Sema::ActOnCXXThrow(SourceLocation OpLoc, ExprArg E) {
131 Expr *Ex = E.takeAs<Expr>();
132 if (Ex && !Ex->isTypeDependent() && CheckCXXThrowOperand(OpLoc, Ex))
134 return Owned(new (Context) CXXThrowExpr(Ex, Context.VoidTy, OpLoc));
137 /// CheckCXXThrowOperand - Validate the operand of a throw.
138 bool Sema::CheckCXXThrowOperand(SourceLocation ThrowLoc, Expr *&E) {
139 // C++ [except.throw]p3:
140 // A throw-expression initializes a temporary object, called the exception
141 // object, the type of which is determined by removing any top-level
142 // cv-qualifiers from the static type of the operand of throw and adjusting
143 // the type from "array of T" or "function returning T" to "pointer to T"
144 // or "pointer to function returning T", [...]
145 if (E->getType().hasQualifiers())
146 ImpCastExprToType(E, E->getType().getUnqualifiedType(), CastExpr::CK_NoOp,
147 E->isLvalue(Context) == Expr::LV_Valid);
149 DefaultFunctionArrayConversion(E);
151 // If the type of the exception would be an incomplete type or a pointer
152 // to an incomplete type other than (cv) void the program is ill-formed.
153 QualType Ty = E->getType();
155 if (const PointerType* Ptr = Ty->getAs<PointerType>()) {
156 Ty = Ptr->getPointeeType();
159 if (!isPointer || !Ty->isVoidType()) {
160 if (RequireCompleteType(ThrowLoc, Ty,
161 PDiag(isPointer ? diag::err_throw_incomplete_ptr
162 : diag::err_throw_incomplete)
163 << E->getSourceRange()))
167 // FIXME: Construct a temporary here.
171 Action::OwningExprResult Sema::ActOnCXXThis(SourceLocation ThisLoc) {
172 /// C++ 9.3.2: In the body of a non-static member function, the keyword this
173 /// is a non-lvalue expression whose value is the address of the object for
174 /// which the function is called.
176 if (!isa<FunctionDecl>(CurContext))
177 return ExprError(Diag(ThisLoc, diag::err_invalid_this_use));
179 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext))
180 if (MD->isInstance())
181 return Owned(new (Context) CXXThisExpr(ThisLoc,
182 MD->getThisType(Context)));
184 return ExprError(Diag(ThisLoc, diag::err_invalid_this_use));
187 /// ActOnCXXTypeConstructExpr - Parse construction of a specified type.
188 /// Can be interpreted either as function-style casting ("int(x)")
189 /// or class type construction ("ClassType(x,y,z)")
190 /// or creation of a value-initialized type ("int()").
191 Action::OwningExprResult
192 Sema::ActOnCXXTypeConstructExpr(SourceRange TypeRange, TypeTy *TypeRep,
193 SourceLocation LParenLoc,
195 SourceLocation *CommaLocs,
196 SourceLocation RParenLoc) {
197 assert(TypeRep && "Missing type!");
198 // FIXME: Preserve type source info.
199 QualType Ty = GetTypeFromParser(TypeRep);
200 unsigned NumExprs = exprs.size();
201 Expr **Exprs = (Expr**)exprs.get();
202 SourceLocation TyBeginLoc = TypeRange.getBegin();
203 SourceRange FullRange = SourceRange(TyBeginLoc, RParenLoc);
205 if (Ty->isDependentType() ||
206 CallExpr::hasAnyTypeDependentArguments(Exprs, NumExprs)) {
209 return Owned(CXXUnresolvedConstructExpr::Create(Context,
210 TypeRange.getBegin(), Ty,
216 if (Ty->isArrayType())
217 return ExprError(Diag(TyBeginLoc,
218 diag::err_value_init_for_array_type) << FullRange);
219 if (!Ty->isVoidType() &&
220 RequireCompleteType(TyBeginLoc, Ty,
221 PDiag(diag::err_invalid_incomplete_type_use)
225 if (RequireNonAbstractType(TyBeginLoc, Ty,
226 diag::err_allocation_of_abstract_type))
230 // C++ [expr.type.conv]p1:
231 // If the expression list is a single expression, the type conversion
232 // expression is equivalent (in definedness, and if defined in meaning) to the
233 // corresponding cast expression.
236 CastExpr::CastKind Kind = CastExpr::CK_Unknown;
237 CXXMethodDecl *Method = 0;
238 if (CheckCastTypes(TypeRange, Ty, Exprs[0], Kind, Method,
239 /*FunctionalStyle=*/true))
244 OwningExprResult CastArg
245 = BuildCXXCastArgument(TypeRange.getBegin(), Ty.getNonReferenceType(),
246 Kind, Method, Owned(Exprs[0]));
247 if (CastArg.isInvalid())
250 Exprs[0] = CastArg.takeAs<Expr>();
253 return Owned(new (Context) CXXFunctionalCastExpr(Ty.getNonReferenceType(),
254 Ty, TyBeginLoc, Kind,
255 Exprs[0], RParenLoc));
258 if (const RecordType *RT = Ty->getAs<RecordType>()) {
259 CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl());
261 if (NumExprs > 1 || !Record->hasTrivialConstructor() ||
262 !Record->hasTrivialDestructor()) {
263 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
265 CXXConstructorDecl *Constructor
266 = PerformInitializationByConstructor(Ty, move(exprs),
267 TypeRange.getBegin(),
268 SourceRange(TypeRange.getBegin(),
271 InitializationKind::CreateDirect(TypeRange.getBegin(),
279 OwningExprResult Result =
280 BuildCXXTemporaryObjectExpr(Constructor, Ty, TyBeginLoc,
281 move_arg(ConstructorArgs), RParenLoc);
282 if (Result.isInvalid())
285 return MaybeBindToTemporary(Result.takeAs<Expr>());
288 // Fall through to value-initialize an object of class type that
289 // doesn't have a user-declared default constructor.
292 // C++ [expr.type.conv]p1:
293 // If the expression list specifies more than a single value, the type shall
294 // be a class with a suitably declared constructor.
297 return ExprError(Diag(CommaLocs[0],
298 diag::err_builtin_func_cast_more_than_one_arg)
301 assert(NumExprs == 0 && "Expected 0 expressions");
302 // C++ [expr.type.conv]p2:
303 // The expression T(), where T is a simple-type-specifier for a non-array
304 // complete object type or the (possibly cv-qualified) void type, creates an
305 // rvalue of the specified type, which is value-initialized.
308 return Owned(new (Context) CXXZeroInitValueExpr(Ty, TyBeginLoc, RParenLoc));
312 /// ActOnCXXNew - Parsed a C++ 'new' expression (C++ 5.3.4), as in e.g.:
313 /// @code new (memory) int[size][4] @endcode
315 /// @code ::new Foo(23, "hello") @endcode
316 /// For the interpretation of this heap of arguments, consult the base version.
317 Action::OwningExprResult
318 Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
319 SourceLocation PlacementLParen, MultiExprArg PlacementArgs,
320 SourceLocation PlacementRParen, bool ParenTypeId,
321 Declarator &D, SourceLocation ConstructorLParen,
322 MultiExprArg ConstructorArgs,
323 SourceLocation ConstructorRParen) {
325 // If the specified type is an array, unwrap it and save the expression.
326 if (D.getNumTypeObjects() > 0 &&
327 D.getTypeObject(0).Kind == DeclaratorChunk::Array) {
328 DeclaratorChunk &Chunk = D.getTypeObject(0);
329 if (Chunk.Arr.hasStatic)
330 return ExprError(Diag(Chunk.Loc, diag::err_static_illegal_in_new)
331 << D.getSourceRange());
332 if (!Chunk.Arr.NumElts)
333 return ExprError(Diag(Chunk.Loc, diag::err_array_new_needs_size)
334 << D.getSourceRange());
337 // Can't have dynamic array size when the type-id is in parentheses.
338 Expr *NumElts = (Expr *)Chunk.Arr.NumElts;
339 if (!NumElts->isTypeDependent() && !NumElts->isValueDependent() &&
340 !NumElts->isIntegerConstantExpr(Context)) {
341 Diag(D.getTypeObject(0).Loc, diag::err_new_paren_array_nonconst)
342 << NumElts->getSourceRange();
347 ArraySize = static_cast<Expr*>(Chunk.Arr.NumElts);
348 D.DropFirstTypeObject();
351 // Every dimension shall be of constant size.
353 for (unsigned I = 0, N = D.getNumTypeObjects(); I < N; ++I) {
354 if (D.getTypeObject(I).Kind != DeclaratorChunk::Array)
357 DeclaratorChunk::ArrayTypeInfo &Array = D.getTypeObject(I).Arr;
358 if (Expr *NumElts = (Expr *)Array.NumElts) {
359 if (!NumElts->isTypeDependent() && !NumElts->isValueDependent() &&
360 !NumElts->isIntegerConstantExpr(Context)) {
361 Diag(D.getTypeObject(I).Loc, diag::err_new_array_nonconst)
362 << NumElts->getSourceRange();
369 //FIXME: Store TypeSourceInfo in CXXNew expression.
370 TypeSourceInfo *TInfo = 0;
371 QualType AllocType = GetTypeForDeclarator(D, /*Scope=*/0, &TInfo);
372 if (D.isInvalidType())
375 return BuildCXXNew(StartLoc, UseGlobal,
381 D.getSourceRange().getBegin(),
385 move(ConstructorArgs),
389 Sema::OwningExprResult
390 Sema::BuildCXXNew(SourceLocation StartLoc, bool UseGlobal,
391 SourceLocation PlacementLParen,
392 MultiExprArg PlacementArgs,
393 SourceLocation PlacementRParen,
396 SourceLocation TypeLoc,
397 SourceRange TypeRange,
399 SourceLocation ConstructorLParen,
400 MultiExprArg ConstructorArgs,
401 SourceLocation ConstructorRParen) {
402 if (CheckAllocatedType(AllocType, TypeLoc, TypeRange))
405 QualType ResultType = Context.getPointerType(AllocType);
407 // That every array dimension except the first is constant was already
408 // checked by the type check above.
410 // C++ 5.3.4p6: "The expression in a direct-new-declarator shall have integral
411 // or enumeration type with a non-negative value."
412 Expr *ArraySize = (Expr *)ArraySizeE.get();
413 if (ArraySize && !ArraySize->isTypeDependent()) {
414 QualType SizeType = ArraySize->getType();
415 if (!SizeType->isIntegralType() && !SizeType->isEnumeralType())
416 return ExprError(Diag(ArraySize->getSourceRange().getBegin(),
417 diag::err_array_size_not_integral)
418 << SizeType << ArraySize->getSourceRange());
419 // Let's see if this is a constant < 0. If so, we reject it out of hand.
420 // We don't care about special rules, so we tell the machinery it's not
421 // evaluated - it gives us a result in more cases.
422 if (!ArraySize->isValueDependent()) {
424 if (ArraySize->isIntegerConstantExpr(Value, Context, 0, false)) {
425 if (Value < llvm::APSInt(
426 llvm::APInt::getNullValue(Value.getBitWidth()),
428 return ExprError(Diag(ArraySize->getSourceRange().getBegin(),
429 diag::err_typecheck_negative_array_size)
430 << ArraySize->getSourceRange());
434 ImpCastExprToType(ArraySize, Context.getSizeType(),
435 CastExpr::CK_IntegralCast);
438 FunctionDecl *OperatorNew = 0;
439 FunctionDecl *OperatorDelete = 0;
440 Expr **PlaceArgs = (Expr**)PlacementArgs.get();
441 unsigned NumPlaceArgs = PlacementArgs.size();
443 if (!AllocType->isDependentType() &&
444 !Expr::hasAnyTypeDependentArguments(PlaceArgs, NumPlaceArgs) &&
445 FindAllocationFunctions(StartLoc,
446 SourceRange(PlacementLParen, PlacementRParen),
447 UseGlobal, AllocType, ArraySize, PlaceArgs,
448 NumPlaceArgs, OperatorNew, OperatorDelete))
450 llvm::SmallVector<Expr *, 8> AllPlaceArgs;
452 // Add default arguments, if any.
453 const FunctionProtoType *Proto =
454 OperatorNew->getType()->getAs<FunctionProtoType>();
455 VariadicCallType CallType =
456 Proto->isVariadic() ? VariadicFunction : VariadicDoesNotApply;
457 bool Invalid = GatherArgumentsForCall(PlacementLParen, OperatorNew,
458 Proto, 1, PlaceArgs, NumPlaceArgs,
459 AllPlaceArgs, CallType);
463 NumPlaceArgs = AllPlaceArgs.size();
464 if (NumPlaceArgs > 0)
465 PlaceArgs = &AllPlaceArgs[0];
468 bool Init = ConstructorLParen.isValid();
469 // --- Choosing a constructor ---
470 CXXConstructorDecl *Constructor = 0;
471 Expr **ConsArgs = (Expr**)ConstructorArgs.get();
472 unsigned NumConsArgs = ConstructorArgs.size();
473 ASTOwningVector<&ActionBase::DeleteExpr> ConvertedConstructorArgs(*this);
475 if (!AllocType->isDependentType() &&
476 !Expr::hasAnyTypeDependentArguments(ConsArgs, NumConsArgs)) {
477 // C++0x [expr.new]p15:
478 // A new-expression that creates an object of type T initializes that
479 // object as follows:
480 InitializationKind Kind
481 // - If the new-initializer is omitted, the object is default-
482 // initialized (8.5); if no initialization is performed,
483 // the object has indeterminate value
484 = !Init? InitializationKind::CreateDefault(TypeLoc)
485 // - Otherwise, the new-initializer is interpreted according to the
486 // initialization rules of 8.5 for direct-initialization.
487 : InitializationKind::CreateDirect(TypeLoc,
491 InitializedEntity Entity
492 = InitializedEntity::InitializeNew(StartLoc, AllocType);
493 InitializationSequence InitSeq(*this, Entity, Kind, ConsArgs, NumConsArgs);
494 OwningExprResult FullInit = InitSeq.Perform(*this, Entity, Kind,
495 move(ConstructorArgs));
496 if (FullInit.isInvalid())
499 // FullInit is our initializer; walk through it to determine if it's a
500 // constructor call, which CXXNewExpr handles directly.
501 if (Expr *FullInitExpr = (Expr *)FullInit.get()) {
502 if (CXXBindTemporaryExpr *Binder
503 = dyn_cast<CXXBindTemporaryExpr>(FullInitExpr))
504 FullInitExpr = Binder->getSubExpr();
505 if (CXXConstructExpr *Construct
506 = dyn_cast<CXXConstructExpr>(FullInitExpr)) {
507 Constructor = Construct->getConstructor();
508 for (CXXConstructExpr::arg_iterator A = Construct->arg_begin(),
509 AEnd = Construct->arg_end();
511 ConvertedConstructorArgs.push_back(A->Retain());
513 // Take the converted initializer.
514 ConvertedConstructorArgs.push_back(FullInit.release());
517 // No initialization required.
520 // Take the converted arguments and use them for the new expression.
521 NumConsArgs = ConvertedConstructorArgs.size();
522 ConsArgs = (Expr **)ConvertedConstructorArgs.take();
525 // FIXME: Also check that the destructor is accessible. (C++ 5.3.4p16)
527 PlacementArgs.release();
528 ConstructorArgs.release();
529 ArraySizeE.release();
530 return Owned(new (Context) CXXNewExpr(UseGlobal, OperatorNew, PlaceArgs,
531 NumPlaceArgs, ParenTypeId, ArraySize, Constructor, Init,
532 ConsArgs, NumConsArgs, OperatorDelete, ResultType,
533 StartLoc, Init ? ConstructorRParen : SourceLocation()));
536 /// CheckAllocatedType - Checks that a type is suitable as the allocated type
537 /// in a new-expression.
538 /// dimension off and stores the size expression in ArraySize.
539 bool Sema::CheckAllocatedType(QualType AllocType, SourceLocation Loc,
541 // C++ 5.3.4p1: "[The] type shall be a complete object type, but not an
542 // abstract class type or array thereof.
543 if (AllocType->isFunctionType())
544 return Diag(Loc, diag::err_bad_new_type)
545 << AllocType << 0 << R;
546 else if (AllocType->isReferenceType())
547 return Diag(Loc, diag::err_bad_new_type)
548 << AllocType << 1 << R;
549 else if (!AllocType->isDependentType() &&
550 RequireCompleteType(Loc, AllocType,
551 PDiag(diag::err_new_incomplete_type)
554 else if (RequireNonAbstractType(Loc, AllocType,
555 diag::err_allocation_of_abstract_type))
561 /// FindAllocationFunctions - Finds the overloads of operator new and delete
562 /// that are appropriate for the allocation.
563 bool Sema::FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
564 bool UseGlobal, QualType AllocType,
565 bool IsArray, Expr **PlaceArgs,
566 unsigned NumPlaceArgs,
567 FunctionDecl *&OperatorNew,
568 FunctionDecl *&OperatorDelete) {
569 // --- Choosing an allocation function ---
570 // C++ 5.3.4p8 - 14 & 18
571 // 1) If UseGlobal is true, only look in the global scope. Else, also look
572 // in the scope of the allocated class.
573 // 2) If an array size is given, look for operator new[], else look for
575 // 3) The first argument is always size_t. Append the arguments from the
577 // FIXME: Also find the appropriate delete operator.
579 llvm::SmallVector<Expr*, 8> AllocArgs(1 + NumPlaceArgs);
580 // We don't care about the actual value of this argument.
581 // FIXME: Should the Sema create the expression and embed it in the syntax
582 // tree? Or should the consumer just recalculate the value?
583 IntegerLiteral Size(llvm::APInt::getNullValue(
584 Context.Target.getPointerWidth(0)),
585 Context.getSizeType(),
587 AllocArgs[0] = &Size;
588 std::copy(PlaceArgs, PlaceArgs + NumPlaceArgs, AllocArgs.begin() + 1);
590 DeclarationName NewName = Context.DeclarationNames.getCXXOperatorName(
591 IsArray ? OO_Array_New : OO_New);
592 if (AllocType->isRecordType() && !UseGlobal) {
593 CXXRecordDecl *Record
594 = cast<CXXRecordDecl>(AllocType->getAs<RecordType>()->getDecl());
595 // FIXME: We fail to find inherited overloads.
596 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0],
597 AllocArgs.size(), Record, /*AllowMissing=*/true,
602 // Didn't find a member overload. Look for a global one.
603 DeclareGlobalNewDelete();
604 DeclContext *TUDecl = Context.getTranslationUnitDecl();
605 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0],
606 AllocArgs.size(), TUDecl, /*AllowMissing=*/false,
611 // FindAllocationOverload can change the passed in arguments, so we need to
613 if (NumPlaceArgs > 0)
614 std::copy(&AllocArgs[1], AllocArgs.end(), PlaceArgs);
619 /// FindAllocationOverload - Find an fitting overload for the allocation
620 /// function in the specified scope.
621 bool Sema::FindAllocationOverload(SourceLocation StartLoc, SourceRange Range,
622 DeclarationName Name, Expr** Args,
623 unsigned NumArgs, DeclContext *Ctx,
624 bool AllowMissing, FunctionDecl *&Operator) {
625 LookupResult R(*this, Name, StartLoc, LookupOrdinaryName);
626 LookupQualifiedName(R, Ctx);
630 return Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
634 // FIXME: handle ambiguity
636 OverloadCandidateSet Candidates;
637 for (LookupResult::iterator Alloc = R.begin(), AllocEnd = R.end();
638 Alloc != AllocEnd; ++Alloc) {
639 // Even member operator new/delete are implicitly treated as
640 // static, so don't use AddMemberCandidate.
641 if (FunctionDecl *Fn =
642 dyn_cast<FunctionDecl>((*Alloc)->getUnderlyingDecl())) {
643 AddOverloadCandidate(Fn, Args, NumArgs, Candidates,
644 /*SuppressUserConversions=*/false);
648 // FIXME: Handle function templates
651 // Do the resolution.
652 OverloadCandidateSet::iterator Best;
653 switch(BestViableFunction(Candidates, StartLoc, Best)) {
656 FunctionDecl *FnDecl = Best->Function;
657 // The first argument is size_t, and the first parameter must be size_t,
658 // too. This is checked on declaration and can be assumed. (It can't be
659 // asserted on, though, since invalid decls are left in there.)
660 // Whatch out for variadic allocator function.
661 unsigned NumArgsInFnDecl = FnDecl->getNumParams();
662 for (unsigned i = 0; (i < NumArgs && i < NumArgsInFnDecl); ++i) {
663 if (PerformCopyInitialization(Args[i],
664 FnDecl->getParamDecl(i)->getType(),
672 case OR_No_Viable_Function:
673 Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
675 PrintOverloadCandidates(Candidates, /*OnlyViable=*/false);
679 Diag(StartLoc, diag::err_ovl_ambiguous_call)
681 PrintOverloadCandidates(Candidates, /*OnlyViable=*/true);
685 Diag(StartLoc, diag::err_ovl_deleted_call)
686 << Best->Function->isDeleted()
688 PrintOverloadCandidates(Candidates, /*OnlyViable=*/true);
691 assert(false && "Unreachable, bad result from BestViableFunction");
696 /// DeclareGlobalNewDelete - Declare the global forms of operator new and
697 /// delete. These are:
699 /// void* operator new(std::size_t) throw(std::bad_alloc);
700 /// void* operator new[](std::size_t) throw(std::bad_alloc);
701 /// void operator delete(void *) throw();
702 /// void operator delete[](void *) throw();
704 /// Note that the placement and nothrow forms of new are *not* implicitly
705 /// declared. Their use requires including \<new\>.
706 void Sema::DeclareGlobalNewDelete() {
707 if (GlobalNewDeleteDeclared)
710 // C++ [basic.std.dynamic]p2:
711 // [...] The following allocation and deallocation functions (18.4) are
712 // implicitly declared in global scope in each translation unit of a
715 // void* operator new(std::size_t) throw(std::bad_alloc);
716 // void* operator new[](std::size_t) throw(std::bad_alloc);
717 // void operator delete(void*) throw();
718 // void operator delete[](void*) throw();
720 // These implicit declarations introduce only the function names operator
721 // new, operator new[], operator delete, operator delete[].
723 // Here, we need to refer to std::bad_alloc, so we will implicitly declare
724 // "std" or "bad_alloc" as necessary to form the exception specification.
725 // However, we do not make these implicit declarations visible to name
728 // The "std" namespace has not yet been defined, so build one implicitly.
729 StdNamespace = NamespaceDecl::Create(Context,
730 Context.getTranslationUnitDecl(),
732 &PP.getIdentifierTable().get("std"));
733 StdNamespace->setImplicit(true);
737 // The "std::bad_alloc" class has not yet been declared, so build it
739 StdBadAlloc = CXXRecordDecl::Create(Context, TagDecl::TK_class,
742 &PP.getIdentifierTable().get("bad_alloc"),
743 SourceLocation(), 0);
744 StdBadAlloc->setImplicit(true);
747 GlobalNewDeleteDeclared = true;
749 QualType VoidPtr = Context.getPointerType(Context.VoidTy);
750 QualType SizeT = Context.getSizeType();
751 bool AssumeSaneOperatorNew = getLangOptions().AssumeSaneOperatorNew;
753 DeclareGlobalAllocationFunction(
754 Context.DeclarationNames.getCXXOperatorName(OO_New),
755 VoidPtr, SizeT, AssumeSaneOperatorNew);
756 DeclareGlobalAllocationFunction(
757 Context.DeclarationNames.getCXXOperatorName(OO_Array_New),
758 VoidPtr, SizeT, AssumeSaneOperatorNew);
759 DeclareGlobalAllocationFunction(
760 Context.DeclarationNames.getCXXOperatorName(OO_Delete),
761 Context.VoidTy, VoidPtr);
762 DeclareGlobalAllocationFunction(
763 Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete),
764 Context.VoidTy, VoidPtr);
767 /// DeclareGlobalAllocationFunction - Declares a single implicit global
768 /// allocation function if it doesn't already exist.
769 void Sema::DeclareGlobalAllocationFunction(DeclarationName Name,
770 QualType Return, QualType Argument,
771 bool AddMallocAttr) {
772 DeclContext *GlobalCtx = Context.getTranslationUnitDecl();
774 // Check if this function is already declared.
776 DeclContext::lookup_iterator Alloc, AllocEnd;
777 for (llvm::tie(Alloc, AllocEnd) = GlobalCtx->lookup(Name);
778 Alloc != AllocEnd; ++Alloc) {
779 // FIXME: Do we need to check for default arguments here?
780 FunctionDecl *Func = cast<FunctionDecl>(*Alloc);
781 if (Func->getNumParams() == 1 &&
782 Context.getCanonicalType(
783 Func->getParamDecl(0)->getType().getUnqualifiedType()) == Argument)
788 QualType BadAllocType;
789 bool HasBadAllocExceptionSpec
790 = (Name.getCXXOverloadedOperator() == OO_New ||
791 Name.getCXXOverloadedOperator() == OO_Array_New);
792 if (HasBadAllocExceptionSpec) {
793 assert(StdBadAlloc && "Must have std::bad_alloc declared");
794 BadAllocType = Context.getTypeDeclType(StdBadAlloc);
797 QualType FnType = Context.getFunctionType(Return, &Argument, 1, false, 0,
799 HasBadAllocExceptionSpec? 1 : 0,
801 FunctionDecl *Alloc =
802 FunctionDecl::Create(Context, GlobalCtx, SourceLocation(), Name,
803 FnType, /*TInfo=*/0, FunctionDecl::None, false, true);
804 Alloc->setImplicit();
807 Alloc->addAttr(::new (Context) MallocAttr());
809 ParmVarDecl *Param = ParmVarDecl::Create(Context, Alloc, SourceLocation(),
810 0, Argument, /*TInfo=*/0,
812 Alloc->setParams(Context, &Param, 1);
814 // FIXME: Also add this declaration to the IdentifierResolver, but
815 // make sure it is at the end of the chain to coincide with the
817 ((DeclContext *)TUScope->getEntity())->addDecl(Alloc);
820 bool Sema::FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD,
821 DeclarationName Name,
822 FunctionDecl* &Operator) {
823 LookupResult Found(*this, Name, StartLoc, LookupOrdinaryName);
824 // Try to find operator delete/operator delete[] in class scope.
825 LookupQualifiedName(Found, RD);
827 if (Found.isAmbiguous())
830 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end();
832 if (CXXMethodDecl *Delete = dyn_cast<CXXMethodDecl>(*F))
833 if (Delete->isUsualDeallocationFunction()) {
839 // We did find operator delete/operator delete[] declarations, but
840 // none of them were suitable.
841 if (!Found.empty()) {
842 Diag(StartLoc, diag::err_no_suitable_delete_member_function_found)
845 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end();
847 Diag((*F)->getLocation(),
848 diag::note_delete_member_function_declared_here)
855 // Look for a global declaration.
856 DeclareGlobalNewDelete();
857 DeclContext *TUDecl = Context.getTranslationUnitDecl();
859 CXXNullPtrLiteralExpr Null(Context.VoidPtrTy, SourceLocation());
860 Expr* DeallocArgs[1];
861 DeallocArgs[0] = &Null;
862 if (FindAllocationOverload(StartLoc, SourceRange(), Name,
863 DeallocArgs, 1, TUDecl, /*AllowMissing=*/false,
867 assert(Operator && "Did not find a deallocation function!");
871 /// ActOnCXXDelete - Parsed a C++ 'delete' expression (C++ 5.3.5), as in:
872 /// @code ::delete ptr; @endcode
874 /// @code delete [] ptr; @endcode
875 Action::OwningExprResult
876 Sema::ActOnCXXDelete(SourceLocation StartLoc, bool UseGlobal,
877 bool ArrayForm, ExprArg Operand) {
878 // C++ [expr.delete]p1:
879 // The operand shall have a pointer type, or a class type having a single
880 // conversion function to a pointer type. The result has type void.
882 // DR599 amends "pointer type" to "pointer to object type" in both cases.
884 FunctionDecl *OperatorDelete = 0;
886 Expr *Ex = (Expr *)Operand.get();
887 if (!Ex->isTypeDependent()) {
888 QualType Type = Ex->getType();
890 if (const RecordType *Record = Type->getAs<RecordType>()) {
891 llvm::SmallVector<CXXConversionDecl *, 4> ObjectPtrConversions;
892 CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
893 const UnresolvedSet *Conversions = RD->getVisibleConversionFunctions();
895 for (UnresolvedSet::iterator I = Conversions->begin(),
896 E = Conversions->end(); I != E; ++I) {
897 // Skip over templated conversion functions; they aren't considered.
898 if (isa<FunctionTemplateDecl>(*I))
901 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*I);
903 QualType ConvType = Conv->getConversionType().getNonReferenceType();
904 if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>())
905 if (ConvPtrType->getPointeeType()->isObjectType())
906 ObjectPtrConversions.push_back(Conv);
908 if (ObjectPtrConversions.size() == 1) {
909 // We have a single conversion to a pointer-to-object type. Perform
912 if (!PerformImplicitConversion(Ex,
913 ObjectPtrConversions.front()->getConversionType(),
916 Type = Ex->getType();
919 else if (ObjectPtrConversions.size() > 1) {
920 Diag(StartLoc, diag::err_ambiguous_delete_operand)
921 << Type << Ex->getSourceRange();
922 for (unsigned i= 0; i < ObjectPtrConversions.size(); i++) {
923 CXXConversionDecl *Conv = ObjectPtrConversions[i];
924 Diag(Conv->getLocation(), diag::err_ovl_candidate);
930 if (!Type->isPointerType())
931 return ExprError(Diag(StartLoc, diag::err_delete_operand)
932 << Type << Ex->getSourceRange());
934 QualType Pointee = Type->getAs<PointerType>()->getPointeeType();
935 if (Pointee->isFunctionType() || Pointee->isVoidType())
936 return ExprError(Diag(StartLoc, diag::err_delete_operand)
937 << Type << Ex->getSourceRange());
938 else if (!Pointee->isDependentType() &&
939 RequireCompleteType(StartLoc, Pointee,
940 PDiag(diag::warn_delete_incomplete)
941 << Ex->getSourceRange()))
944 // C++ [expr.delete]p2:
945 // [Note: a pointer to a const type can be the operand of a
946 // delete-expression; it is not necessary to cast away the constness
947 // (5.2.11) of the pointer expression before it is used as the operand
948 // of the delete-expression. ]
949 ImpCastExprToType(Ex, Context.getPointerType(Context.VoidTy),
952 // Update the operand.
954 Operand = ExprArg(*this, Ex);
956 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
957 ArrayForm ? OO_Array_Delete : OO_Delete);
959 if (const RecordType *RT = Pointee->getAs<RecordType>()) {
960 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
963 FindDeallocationFunction(StartLoc, RD, DeleteName, OperatorDelete))
966 if (!RD->hasTrivialDestructor())
967 if (const CXXDestructorDecl *Dtor = RD->getDestructor(Context))
968 MarkDeclarationReferenced(StartLoc,
969 const_cast<CXXDestructorDecl*>(Dtor));
972 if (!OperatorDelete) {
973 // Look for a global declaration.
974 DeclareGlobalNewDelete();
975 DeclContext *TUDecl = Context.getTranslationUnitDecl();
976 if (FindAllocationOverload(StartLoc, SourceRange(), DeleteName,
977 &Ex, 1, TUDecl, /*AllowMissing=*/false,
982 // FIXME: Check access and ambiguity of operator delete and destructor.
986 return Owned(new (Context) CXXDeleteExpr(Context.VoidTy, UseGlobal, ArrayForm,
987 OperatorDelete, Ex, StartLoc));
990 /// \brief Check the use of the given variable as a C++ condition in an if,
991 /// while, do-while, or switch statement.
992 Action::OwningExprResult Sema::CheckConditionVariable(VarDecl *ConditionVar) {
993 QualType T = ConditionVar->getType();
995 // C++ [stmt.select]p2:
996 // The declarator shall not specify a function or an array.
997 if (T->isFunctionType())
998 return ExprError(Diag(ConditionVar->getLocation(),
999 diag::err_invalid_use_of_function_type)
1000 << ConditionVar->getSourceRange());
1001 else if (T->isArrayType())
1002 return ExprError(Diag(ConditionVar->getLocation(),
1003 diag::err_invalid_use_of_array_type)
1004 << ConditionVar->getSourceRange());
1006 return Owned(DeclRefExpr::Create(Context, 0, SourceRange(), ConditionVar,
1007 ConditionVar->getLocation(),
1008 ConditionVar->getType().getNonReferenceType()));
1011 /// CheckCXXBooleanCondition - Returns true if a conversion to bool is invalid.
1012 bool Sema::CheckCXXBooleanCondition(Expr *&CondExpr) {
1014 // The value of a condition that is an initialized declaration in a statement
1015 // other than a switch statement is the value of the declared variable
1016 // implicitly converted to type bool. If that conversion is ill-formed, the
1017 // program is ill-formed.
1018 // The value of a condition that is an expression is the value of the
1019 // expression, implicitly converted to bool.
1021 return PerformContextuallyConvertToBool(CondExpr);
1024 /// Helper function to determine whether this is the (deprecated) C++
1025 /// conversion from a string literal to a pointer to non-const char or
1026 /// non-const wchar_t (for narrow and wide string literals,
1029 Sema::IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType) {
1030 // Look inside the implicit cast, if it exists.
1031 if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(From))
1032 From = Cast->getSubExpr();
1034 // A string literal (2.13.4) that is not a wide string literal can
1035 // be converted to an rvalue of type "pointer to char"; a wide
1036 // string literal can be converted to an rvalue of type "pointer
1037 // to wchar_t" (C++ 4.2p2).
1038 if (StringLiteral *StrLit = dyn_cast<StringLiteral>(From))
1039 if (const PointerType *ToPtrType = ToType->getAs<PointerType>())
1040 if (const BuiltinType *ToPointeeType
1041 = ToPtrType->getPointeeType()->getAs<BuiltinType>()) {
1042 // This conversion is considered only when there is an
1043 // explicit appropriate pointer target type (C++ 4.2p2).
1044 if (!ToPtrType->getPointeeType().hasQualifiers() &&
1045 ((StrLit->isWide() && ToPointeeType->isWideCharType()) ||
1046 (!StrLit->isWide() &&
1047 (ToPointeeType->getKind() == BuiltinType::Char_U ||
1048 ToPointeeType->getKind() == BuiltinType::Char_S))))
1055 /// PerformImplicitConversion - Perform an implicit conversion of the
1056 /// expression From to the type ToType. Returns true if there was an
1057 /// error, false otherwise. The expression From is replaced with the
1058 /// converted expression. Flavor is the kind of conversion we're
1059 /// performing, used in the error message. If @p AllowExplicit,
1060 /// explicit user-defined conversions are permitted. @p Elidable should be true
1061 /// when called for copies which may be elided (C++ 12.8p15). C++0x overload
1062 /// resolution works differently in that case.
1064 Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
1065 AssignmentAction Action, bool AllowExplicit,
1067 ImplicitConversionSequence ICS;
1068 return PerformImplicitConversion(From, ToType, Action, AllowExplicit,
1073 Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
1074 AssignmentAction Action, bool AllowExplicit,
1076 ImplicitConversionSequence& ICS) {
1077 ICS.ConversionKind = ImplicitConversionSequence::BadConversion;
1078 if (Elidable && getLangOptions().CPlusPlus0x) {
1079 ICS = TryImplicitConversion(From, ToType,
1080 /*SuppressUserConversions=*/false,
1082 /*ForceRValue=*/true,
1083 /*InOverloadResolution=*/false);
1085 if (ICS.ConversionKind == ImplicitConversionSequence::BadConversion) {
1086 ICS = TryImplicitConversion(From, ToType,
1087 /*SuppressUserConversions=*/false,
1089 /*ForceRValue=*/false,
1090 /*InOverloadResolution=*/false);
1092 return PerformImplicitConversion(From, ToType, ICS, Action);
1095 /// BuildCXXDerivedToBaseExpr - This routine generates the suitable AST
1096 /// for the derived to base conversion of the expression 'From'. All
1097 /// necessary information is passed in ICS.
1099 Sema::BuildCXXDerivedToBaseExpr(Expr *&From, CastExpr::CastKind CastKind,
1100 const ImplicitConversionSequence& ICS) {
1102 QualType::getFromOpaquePtr(ICS.UserDefined.After.ToTypePtr);
1103 // Must do additional defined to base conversion.
1104 QualType DerivedType =
1105 QualType::getFromOpaquePtr(ICS.UserDefined.After.FromTypePtr);
1107 From = new (Context) ImplicitCastExpr(
1108 DerivedType.getNonReferenceType(),
1111 DerivedType->isLValueReferenceType());
1112 From = new (Context) ImplicitCastExpr(BaseType.getNonReferenceType(),
1113 CastExpr::CK_DerivedToBase, From,
1114 BaseType->isLValueReferenceType());
1115 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
1116 OwningExprResult FromResult =
1117 BuildCXXConstructExpr(
1118 ICS.UserDefined.After.CopyConstructor->getLocation(),
1120 ICS.UserDefined.After.CopyConstructor,
1121 MultiExprArg(*this, (void **)&From, 1));
1122 if (FromResult.isInvalid())
1124 From = FromResult.takeAs<Expr>();
1128 /// PerformImplicitConversion - Perform an implicit conversion of the
1129 /// expression From to the type ToType using the pre-computed implicit
1130 /// conversion sequence ICS. Returns true if there was an error, false
1131 /// otherwise. The expression From is replaced with the converted
1132 /// expression. Action is the kind of conversion we're performing,
1133 /// used in the error message.
1135 Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
1136 const ImplicitConversionSequence &ICS,
1137 AssignmentAction Action, bool IgnoreBaseAccess) {
1138 switch (ICS.ConversionKind) {
1139 case ImplicitConversionSequence::StandardConversion:
1140 if (PerformImplicitConversion(From, ToType, ICS.Standard, Action,
1145 case ImplicitConversionSequence::UserDefinedConversion: {
1147 FunctionDecl *FD = ICS.UserDefined.ConversionFunction;
1148 CastExpr::CastKind CastKind = CastExpr::CK_Unknown;
1149 QualType BeforeToType;
1150 if (const CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(FD)) {
1151 CastKind = CastExpr::CK_UserDefinedConversion;
1153 // If the user-defined conversion is specified by a conversion function,
1154 // the initial standard conversion sequence converts the source type to
1155 // the implicit object parameter of the conversion function.
1156 BeforeToType = Context.getTagDeclType(Conv->getParent());
1157 } else if (const CXXConstructorDecl *Ctor =
1158 dyn_cast<CXXConstructorDecl>(FD)) {
1159 CastKind = CastExpr::CK_ConstructorConversion;
1160 // Do no conversion if dealing with ... for the first conversion.
1161 if (!ICS.UserDefined.EllipsisConversion) {
1162 // If the user-defined conversion is specified by a constructor, the
1163 // initial standard conversion sequence converts the source type to the
1164 // type required by the argument of the constructor
1165 BeforeToType = Ctor->getParamDecl(0)->getType().getNonReferenceType();
1169 assert(0 && "Unknown conversion function kind!");
1170 // Whatch out for elipsis conversion.
1171 if (!ICS.UserDefined.EllipsisConversion) {
1172 if (PerformImplicitConversion(From, BeforeToType,
1173 ICS.UserDefined.Before, AA_Converting,
1178 OwningExprResult CastArg
1179 = BuildCXXCastArgument(From->getLocStart(),
1180 ToType.getNonReferenceType(),
1181 CastKind, cast<CXXMethodDecl>(FD),
1184 if (CastArg.isInvalid())
1187 From = CastArg.takeAs<Expr>();
1189 // FIXME: This and the following if statement shouldn't be necessary, but
1190 // there's some nasty stuff involving MaybeBindToTemporary going on here.
1191 if (ICS.UserDefined.After.Second == ICK_Derived_To_Base &&
1192 ICS.UserDefined.After.CopyConstructor) {
1193 return BuildCXXDerivedToBaseExpr(From, CastKind, ICS);
1196 if (ICS.UserDefined.After.CopyConstructor) {
1197 From = new (Context) ImplicitCastExpr(ToType.getNonReferenceType(),
1199 ToType->isLValueReferenceType());
1203 return PerformImplicitConversion(From, ToType, ICS.UserDefined.After,
1204 AA_Converting, IgnoreBaseAccess);
1207 case ImplicitConversionSequence::EllipsisConversion:
1208 assert(false && "Cannot perform an ellipsis conversion");
1211 case ImplicitConversionSequence::BadConversion:
1215 // Everything went well.
1219 /// PerformImplicitConversion - Perform an implicit conversion of the
1220 /// expression From to the type ToType by following the standard
1221 /// conversion sequence SCS. Returns true if there was an error, false
1222 /// otherwise. The expression From is replaced with the converted
1223 /// expression. Flavor is the context in which we're performing this
1224 /// conversion, for use in error messages.
1226 Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
1227 const StandardConversionSequence& SCS,
1228 AssignmentAction Action, bool IgnoreBaseAccess) {
1229 // Overall FIXME: we are recomputing too many types here and doing far too
1230 // much extra work. What this means is that we need to keep track of more
1231 // information that is computed when we try the implicit conversion initially,
1232 // so that we don't need to recompute anything here.
1233 QualType FromType = From->getType();
1235 if (SCS.CopyConstructor) {
1236 // FIXME: When can ToType be a reference type?
1237 assert(!ToType->isReferenceType());
1238 if (SCS.Second == ICK_Derived_To_Base) {
1239 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
1240 if (CompleteConstructorCall(cast<CXXConstructorDecl>(SCS.CopyConstructor),
1241 MultiExprArg(*this, (void **)&From, 1),
1242 /*FIXME:ConstructLoc*/SourceLocation(),
1245 OwningExprResult FromResult =
1246 BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(),
1247 ToType, SCS.CopyConstructor,
1248 move_arg(ConstructorArgs));
1249 if (FromResult.isInvalid())
1251 From = FromResult.takeAs<Expr>();
1254 OwningExprResult FromResult =
1255 BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(),
1256 ToType, SCS.CopyConstructor,
1257 MultiExprArg(*this, (void**)&From, 1));
1259 if (FromResult.isInvalid())
1262 From = FromResult.takeAs<Expr>();
1266 // Perform the first implicit conversion.
1267 switch (SCS.First) {
1269 case ICK_Lvalue_To_Rvalue:
1273 case ICK_Array_To_Pointer:
1274 FromType = Context.getArrayDecayedType(FromType);
1275 ImpCastExprToType(From, FromType, CastExpr::CK_ArrayToPointerDecay);
1278 case ICK_Function_To_Pointer:
1279 if (Context.getCanonicalType(FromType) == Context.OverloadTy) {
1280 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(From, ToType, true);
1284 if (DiagnoseUseOfDecl(Fn, From->getSourceRange().getBegin()))
1287 From = FixOverloadedFunctionReference(From, Fn);
1288 FromType = From->getType();
1290 // If there's already an address-of operator in the expression, we have
1291 // the right type already, and the code below would just introduce an
1292 // invalid additional pointer level.
1293 if (FromType->isPointerType() || FromType->isMemberFunctionPointerType())
1296 FromType = Context.getPointerType(FromType);
1297 ImpCastExprToType(From, FromType, CastExpr::CK_FunctionToPointerDecay);
1301 assert(false && "Improper first standard conversion");
1305 // Perform the second implicit conversion
1306 switch (SCS.Second) {
1308 // If both sides are functions (or pointers/references to them), there could
1309 // be incompatible exception declarations.
1310 if (CheckExceptionSpecCompatibility(From, ToType))
1312 // Nothing else to do.
1315 case ICK_NoReturn_Adjustment:
1316 // If both sides are functions (or pointers/references to them), there could
1317 // be incompatible exception declarations.
1318 if (CheckExceptionSpecCompatibility(From, ToType))
1321 ImpCastExprToType(From, Context.getNoReturnType(From->getType(), false),
1325 case ICK_Integral_Promotion:
1326 case ICK_Integral_Conversion:
1327 ImpCastExprToType(From, ToType, CastExpr::CK_IntegralCast);
1330 case ICK_Floating_Promotion:
1331 case ICK_Floating_Conversion:
1332 ImpCastExprToType(From, ToType, CastExpr::CK_FloatingCast);
1335 case ICK_Complex_Promotion:
1336 case ICK_Complex_Conversion:
1337 ImpCastExprToType(From, ToType, CastExpr::CK_Unknown);
1340 case ICK_Floating_Integral:
1341 if (ToType->isFloatingType())
1342 ImpCastExprToType(From, ToType, CastExpr::CK_IntegralToFloating);
1344 ImpCastExprToType(From, ToType, CastExpr::CK_FloatingToIntegral);
1347 case ICK_Complex_Real:
1348 ImpCastExprToType(From, ToType, CastExpr::CK_Unknown);
1351 case ICK_Compatible_Conversion:
1352 ImpCastExprToType(From, ToType, CastExpr::CK_NoOp);
1355 case ICK_Pointer_Conversion: {
1356 if (SCS.IncompatibleObjC) {
1357 // Diagnose incompatible Objective-C conversions
1358 Diag(From->getSourceRange().getBegin(),
1359 diag::ext_typecheck_convert_incompatible_pointer)
1360 << From->getType() << ToType << Action
1361 << From->getSourceRange();
1365 CastExpr::CastKind Kind = CastExpr::CK_Unknown;
1366 if (CheckPointerConversion(From, ToType, Kind, IgnoreBaseAccess))
1368 ImpCastExprToType(From, ToType, Kind);
1372 case ICK_Pointer_Member: {
1373 CastExpr::CastKind Kind = CastExpr::CK_Unknown;
1374 if (CheckMemberPointerConversion(From, ToType, Kind, IgnoreBaseAccess))
1376 if (CheckExceptionSpecCompatibility(From, ToType))
1378 ImpCastExprToType(From, ToType, Kind);
1381 case ICK_Boolean_Conversion: {
1382 CastExpr::CastKind Kind = CastExpr::CK_Unknown;
1383 if (FromType->isMemberPointerType())
1384 Kind = CastExpr::CK_MemberPointerToBoolean;
1386 ImpCastExprToType(From, Context.BoolTy, Kind);
1390 case ICK_Derived_To_Base:
1391 if (CheckDerivedToBaseConversion(From->getType(),
1392 ToType.getNonReferenceType(),
1393 From->getLocStart(),
1394 From->getSourceRange(),
1397 ImpCastExprToType(From, ToType.getNonReferenceType(),
1398 CastExpr::CK_DerivedToBase);
1402 assert(false && "Improper second standard conversion");
1406 switch (SCS.Third) {
1411 case ICK_Qualification:
1412 // FIXME: Not sure about lvalue vs rvalue here in the presence of rvalue
1414 ImpCastExprToType(From, ToType.getNonReferenceType(),
1416 ToType->isLValueReferenceType());
1420 assert(false && "Improper second standard conversion");
1427 Sema::OwningExprResult Sema::ActOnUnaryTypeTrait(UnaryTypeTrait OTT,
1428 SourceLocation KWLoc,
1429 SourceLocation LParen,
1431 SourceLocation RParen) {
1432 QualType T = GetTypeFromParser(Ty);
1434 // According to http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html
1435 // all traits except __is_class, __is_enum and __is_union require a the type
1437 if (OTT != UTT_IsClass && OTT != UTT_IsEnum && OTT != UTT_IsUnion) {
1438 if (RequireCompleteType(KWLoc, T,
1439 diag::err_incomplete_type_used_in_type_trait_expr))
1443 // There is no point in eagerly computing the value. The traits are designed
1444 // to be used from type trait templates, so Ty will be a template parameter
1446 return Owned(new (Context) UnaryTypeTraitExpr(KWLoc, OTT, T,
1447 RParen, Context.BoolTy));
1450 QualType Sema::CheckPointerToMemberOperands(
1451 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isIndirect) {
1452 const char *OpSpelling = isIndirect ? "->*" : ".*";
1454 // The binary operator .* [p3: ->*] binds its second operand, which shall
1455 // be of type "pointer to member of T" (where T is a completely-defined
1456 // class type) [...]
1457 QualType RType = rex->getType();
1458 const MemberPointerType *MemPtr = RType->getAs<MemberPointerType>();
1460 Diag(Loc, diag::err_bad_memptr_rhs)
1461 << OpSpelling << RType << rex->getSourceRange();
1465 QualType Class(MemPtr->getClass(), 0);
1468 // [...] to its first operand, which shall be of class T or of a class of
1469 // which T is an unambiguous and accessible base class. [p3: a pointer to
1471 QualType LType = lex->getType();
1473 if (const PointerType *Ptr = LType->getAs<PointerType>())
1474 LType = Ptr->getPointeeType().getNonReferenceType();
1476 Diag(Loc, diag::err_bad_memptr_lhs)
1477 << OpSpelling << 1 << LType
1478 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ".*");
1483 if (!Context.hasSameUnqualifiedType(Class, LType)) {
1484 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/false,
1485 /*DetectVirtual=*/false);
1486 // FIXME: Would it be useful to print full ambiguity paths, or is that
1488 if (!IsDerivedFrom(LType, Class, Paths) ||
1489 Paths.isAmbiguous(Context.getCanonicalType(Class))) {
1490 const char *ReplaceStr = isIndirect ? ".*" : "->*";
1491 Diag(Loc, diag::err_bad_memptr_lhs) << OpSpelling
1492 << (int)isIndirect << lex->getType() <<
1493 CodeModificationHint::CreateReplacement(SourceRange(Loc), ReplaceStr);
1498 if (isa<CXXZeroInitValueExpr>(rex->IgnoreParens())) {
1499 // Diagnose use of pointer-to-member type which when used as
1500 // the functional cast in a pointer-to-member expression.
1501 Diag(Loc, diag::err_pointer_to_member_type) << isIndirect;
1505 // The result is an object or a function of the type specified by the
1507 // The cv qualifiers are the union of those in the pointer and the left side,
1508 // in accordance with 5.5p5 and 5.2.5.
1509 // FIXME: This returns a dereferenced member function pointer as a normal
1510 // function type. However, the only operation valid on such functions is
1511 // calling them. There's also a GCC extension to get a function pointer to the
1512 // thing, which is another complication, because this type - unlike the type
1513 // that is the result of this expression - takes the class as the first
1515 // We probably need a "MemberFunctionClosureType" or something like that.
1516 QualType Result = MemPtr->getPointeeType();
1517 Result = Context.getCVRQualifiedType(Result, LType.getCVRQualifiers());
1521 /// \brief Get the target type of a standard or user-defined conversion.
1522 static QualType TargetType(const ImplicitConversionSequence &ICS) {
1523 assert((ICS.ConversionKind ==
1524 ImplicitConversionSequence::StandardConversion ||
1525 ICS.ConversionKind ==
1526 ImplicitConversionSequence::UserDefinedConversion) &&
1527 "function only valid for standard or user-defined conversions");
1528 if (ICS.ConversionKind == ImplicitConversionSequence::StandardConversion)
1529 return QualType::getFromOpaquePtr(ICS.Standard.ToTypePtr);
1530 return QualType::getFromOpaquePtr(ICS.UserDefined.After.ToTypePtr);
1533 /// \brief Try to convert a type to another according to C++0x 5.16p3.
1535 /// This is part of the parameter validation for the ? operator. If either
1536 /// value operand is a class type, the two operands are attempted to be
1537 /// converted to each other. This function does the conversion in one direction.
1538 /// It emits a diagnostic and returns true only if it finds an ambiguous
1540 static bool TryClassUnification(Sema &Self, Expr *From, Expr *To,
1541 SourceLocation QuestionLoc,
1542 ImplicitConversionSequence &ICS) {
1544 // The process for determining whether an operand expression E1 of type T1
1545 // can be converted to match an operand expression E2 of type T2 is defined
1547 // -- If E2 is an lvalue:
1548 if (To->isLvalue(Self.Context) == Expr::LV_Valid) {
1549 // E1 can be converted to match E2 if E1 can be implicitly converted to
1550 // type "lvalue reference to T2", subject to the constraint that in the
1551 // conversion the reference must bind directly to E1.
1552 if (!Self.CheckReferenceInit(From,
1553 Self.Context.getLValueReferenceType(To->getType()),
1555 /*SuppressUserConversions=*/false,
1556 /*AllowExplicit=*/false,
1557 /*ForceRValue=*/false,
1560 assert((ICS.ConversionKind ==
1561 ImplicitConversionSequence::StandardConversion ||
1562 ICS.ConversionKind ==
1563 ImplicitConversionSequence::UserDefinedConversion) &&
1564 "expected a definite conversion");
1565 bool DirectBinding =
1566 ICS.ConversionKind == ImplicitConversionSequence::StandardConversion ?
1567 ICS.Standard.DirectBinding : ICS.UserDefined.After.DirectBinding;
1572 ICS.ConversionKind = ImplicitConversionSequence::BadConversion;
1573 // -- If E2 is an rvalue, or if the conversion above cannot be done:
1574 // -- if E1 and E2 have class type, and the underlying class types are
1575 // the same or one is a base class of the other:
1576 QualType FTy = From->getType();
1577 QualType TTy = To->getType();
1578 const RecordType *FRec = FTy->getAs<RecordType>();
1579 const RecordType *TRec = TTy->getAs<RecordType>();
1580 bool FDerivedFromT = FRec && TRec && Self.IsDerivedFrom(FTy, TTy);
1581 if (FRec && TRec && (FRec == TRec ||
1582 FDerivedFromT || Self.IsDerivedFrom(TTy, FTy))) {
1583 // E1 can be converted to match E2 if the class of T2 is the
1584 // same type as, or a base class of, the class of T1, and
1586 if ((FRec == TRec || FDerivedFromT) && TTy.isAtLeastAsQualifiedAs(FTy)) {
1587 // Could still fail if there's no copy constructor.
1588 // FIXME: Is this a hard error then, or just a conversion failure? The
1589 // standard doesn't say.
1590 ICS = Self.TryCopyInitialization(From, TTy,
1591 /*SuppressUserConversions=*/false,
1592 /*ForceRValue=*/false,
1593 /*InOverloadResolution=*/false);
1596 // -- Otherwise: E1 can be converted to match E2 if E1 can be
1597 // implicitly converted to the type that expression E2 would have
1598 // if E2 were converted to an rvalue.
1599 // First find the decayed type.
1600 if (TTy->isFunctionType())
1601 TTy = Self.Context.getPointerType(TTy);
1602 else if (TTy->isArrayType())
1603 TTy = Self.Context.getArrayDecayedType(TTy);
1605 // Now try the implicit conversion.
1606 // FIXME: This doesn't detect ambiguities.
1607 ICS = Self.TryImplicitConversion(From, TTy,
1608 /*SuppressUserConversions=*/false,
1609 /*AllowExplicit=*/false,
1610 /*ForceRValue=*/false,
1611 /*InOverloadResolution=*/false);
1616 /// \brief Try to find a common type for two according to C++0x 5.16p5.
1618 /// This is part of the parameter validation for the ? operator. If either
1619 /// value operand is a class type, overload resolution is used to find a
1620 /// conversion to a common type.
1621 static bool FindConditionalOverload(Sema &Self, Expr *&LHS, Expr *&RHS,
1622 SourceLocation Loc) {
1623 Expr *Args[2] = { LHS, RHS };
1624 OverloadCandidateSet CandidateSet;
1625 Self.AddBuiltinOperatorCandidates(OO_Conditional, Loc, Args, 2, CandidateSet);
1627 OverloadCandidateSet::iterator Best;
1628 switch (Self.BestViableFunction(CandidateSet, Loc, Best)) {
1630 // We found a match. Perform the conversions on the arguments and move on.
1631 if (Self.PerformImplicitConversion(LHS, Best->BuiltinTypes.ParamTypes[0],
1632 Best->Conversions[0], Sema::AA_Converting) ||
1633 Self.PerformImplicitConversion(RHS, Best->BuiltinTypes.ParamTypes[1],
1634 Best->Conversions[1], Sema::AA_Converting))
1638 case OR_No_Viable_Function:
1639 Self.Diag(Loc, diag::err_typecheck_cond_incompatible_operands)
1640 << LHS->getType() << RHS->getType()
1641 << LHS->getSourceRange() << RHS->getSourceRange();
1645 Self.Diag(Loc, diag::err_conditional_ambiguous_ovl)
1646 << LHS->getType() << RHS->getType()
1647 << LHS->getSourceRange() << RHS->getSourceRange();
1648 // FIXME: Print the possible common types by printing the return types of
1649 // the viable candidates.
1653 assert(false && "Conditional operator has only built-in overloads");
1659 /// \brief Perform an "extended" implicit conversion as returned by
1660 /// TryClassUnification.
1662 /// TryClassUnification generates ICSs that include reference bindings.
1663 /// PerformImplicitConversion is not suitable for this; it chokes if the
1664 /// second part of a standard conversion is ICK_DerivedToBase. This function
1665 /// handles the reference binding specially.
1666 static bool ConvertForConditional(Sema &Self, Expr *&E,
1667 const ImplicitConversionSequence &ICS) {
1668 if (ICS.ConversionKind == ImplicitConversionSequence::StandardConversion &&
1669 ICS.Standard.ReferenceBinding) {
1670 assert(ICS.Standard.DirectBinding &&
1671 "TryClassUnification should never generate indirect ref bindings");
1672 // FIXME: CheckReferenceInit should be able to reuse the ICS instead of
1673 // redoing all the work.
1674 return Self.CheckReferenceInit(E, Self.Context.getLValueReferenceType(
1676 /*FIXME:*/E->getLocStart(),
1677 /*SuppressUserConversions=*/false,
1678 /*AllowExplicit=*/false,
1679 /*ForceRValue=*/false);
1681 if (ICS.ConversionKind == ImplicitConversionSequence::UserDefinedConversion &&
1682 ICS.UserDefined.After.ReferenceBinding) {
1683 assert(ICS.UserDefined.After.DirectBinding &&
1684 "TryClassUnification should never generate indirect ref bindings");
1685 return Self.CheckReferenceInit(E, Self.Context.getLValueReferenceType(
1687 /*FIXME:*/E->getLocStart(),
1688 /*SuppressUserConversions=*/false,
1689 /*AllowExplicit=*/false,
1690 /*ForceRValue=*/false);
1692 if (Self.PerformImplicitConversion(E, TargetType(ICS), ICS, Sema::AA_Converting))
1697 /// \brief Check the operands of ?: under C++ semantics.
1699 /// See C++ [expr.cond]. Note that LHS is never null, even for the GNU x ?: y
1700 /// extension. In this case, LHS == Cond. (But they're not aliases.)
1701 QualType Sema::CXXCheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS,
1702 SourceLocation QuestionLoc) {
1703 // FIXME: Handle C99's complex types, vector types, block pointers and Obj-C++
1704 // interface pointers.
1707 // The first expression is contextually converted to bool.
1708 if (!Cond->isTypeDependent()) {
1709 if (CheckCXXBooleanCondition(Cond))
1713 // Either of the arguments dependent?
1714 if (LHS->isTypeDependent() || RHS->isTypeDependent())
1715 return Context.DependentTy;
1717 CheckSignCompare(LHS, RHS, QuestionLoc, diag::warn_mixed_sign_conditional);
1720 // If either the second or the third operand has type (cv) void, ...
1721 QualType LTy = LHS->getType();
1722 QualType RTy = RHS->getType();
1723 bool LVoid = LTy->isVoidType();
1724 bool RVoid = RTy->isVoidType();
1725 if (LVoid || RVoid) {
1726 // ... then the [l2r] conversions are performed on the second and third
1728 DefaultFunctionArrayConversion(LHS);
1729 DefaultFunctionArrayConversion(RHS);
1730 LTy = LHS->getType();
1731 RTy = RHS->getType();
1733 // ... and one of the following shall hold:
1734 // -- The second or the third operand (but not both) is a throw-
1735 // expression; the result is of the type of the other and is an rvalue.
1736 bool LThrow = isa<CXXThrowExpr>(LHS);
1737 bool RThrow = isa<CXXThrowExpr>(RHS);
1738 if (LThrow && !RThrow)
1740 if (RThrow && !LThrow)
1743 // -- Both the second and third operands have type void; the result is of
1744 // type void and is an rvalue.
1746 return Context.VoidTy;
1748 // Neither holds, error.
1749 Diag(QuestionLoc, diag::err_conditional_void_nonvoid)
1750 << (LVoid ? RTy : LTy) << (LVoid ? 0 : 1)
1751 << LHS->getSourceRange() << RHS->getSourceRange();
1758 // Otherwise, if the second and third operand have different types, and
1759 // either has (cv) class type, and attempt is made to convert each of those
1760 // operands to the other.
1761 if (Context.getCanonicalType(LTy) != Context.getCanonicalType(RTy) &&
1762 (LTy->isRecordType() || RTy->isRecordType())) {
1763 ImplicitConversionSequence ICSLeftToRight, ICSRightToLeft;
1764 // These return true if a single direction is already ambiguous.
1765 if (TryClassUnification(*this, LHS, RHS, QuestionLoc, ICSLeftToRight))
1767 if (TryClassUnification(*this, RHS, LHS, QuestionLoc, ICSRightToLeft))
1770 bool HaveL2R = ICSLeftToRight.ConversionKind !=
1771 ImplicitConversionSequence::BadConversion;
1772 bool HaveR2L = ICSRightToLeft.ConversionKind !=
1773 ImplicitConversionSequence::BadConversion;
1774 // If both can be converted, [...] the program is ill-formed.
1775 if (HaveL2R && HaveR2L) {
1776 Diag(QuestionLoc, diag::err_conditional_ambiguous)
1777 << LTy << RTy << LHS->getSourceRange() << RHS->getSourceRange();
1781 // If exactly one conversion is possible, that conversion is applied to
1782 // the chosen operand and the converted operands are used in place of the
1783 // original operands for the remainder of this section.
1785 if (ConvertForConditional(*this, LHS, ICSLeftToRight))
1787 LTy = LHS->getType();
1788 } else if (HaveR2L) {
1789 if (ConvertForConditional(*this, RHS, ICSRightToLeft))
1791 RTy = RHS->getType();
1796 // If the second and third operands are lvalues and have the same type,
1797 // the result is of that type [...]
1798 bool Same = Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy);
1799 if (Same && LHS->isLvalue(Context) == Expr::LV_Valid &&
1800 RHS->isLvalue(Context) == Expr::LV_Valid)
1804 // Otherwise, the result is an rvalue. If the second and third operands
1805 // do not have the same type, and either has (cv) class type, ...
1806 if (!Same && (LTy->isRecordType() || RTy->isRecordType())) {
1807 // ... overload resolution is used to determine the conversions (if any)
1808 // to be applied to the operands. If the overload resolution fails, the
1809 // program is ill-formed.
1810 if (FindConditionalOverload(*this, LHS, RHS, QuestionLoc))
1815 // LValue-to-rvalue, array-to-pointer, and function-to-pointer standard
1816 // conversions are performed on the second and third operands.
1817 DefaultFunctionArrayConversion(LHS);
1818 DefaultFunctionArrayConversion(RHS);
1819 LTy = LHS->getType();
1820 RTy = RHS->getType();
1822 // After those conversions, one of the following shall hold:
1823 // -- The second and third operands have the same type; the result
1825 if (Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy))
1828 // -- The second and third operands have arithmetic or enumeration type;
1829 // the usual arithmetic conversions are performed to bring them to a
1830 // common type, and the result is of that type.
1831 if (LTy->isArithmeticType() && RTy->isArithmeticType()) {
1832 UsualArithmeticConversions(LHS, RHS);
1833 return LHS->getType();
1836 // -- The second and third operands have pointer type, or one has pointer
1837 // type and the other is a null pointer constant; pointer conversions
1838 // and qualification conversions are performed to bring them to their
1839 // composite pointer type. The result is of the composite pointer type.
1840 QualType Composite = FindCompositePointerType(LHS, RHS);
1841 if (!Composite.isNull())
1844 // Similarly, attempt to find composite type of twp objective-c pointers.
1845 Composite = FindCompositeObjCPointerType(LHS, RHS, QuestionLoc);
1846 if (!Composite.isNull())
1849 // Fourth bullet is same for pointers-to-member. However, the possible
1850 // conversions are far more limited: we have null-to-pointer, upcast of
1851 // containing class, and second-level cv-ness.
1852 // cv-ness is not a union, but must match one of the two operands. (Which,
1853 // frankly, is stupid.)
1854 const MemberPointerType *LMemPtr = LTy->getAs<MemberPointerType>();
1855 const MemberPointerType *RMemPtr = RTy->getAs<MemberPointerType>();
1857 RHS->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
1858 ImpCastExprToType(RHS, LTy, CastExpr::CK_NullToMemberPointer);
1862 LHS->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
1863 ImpCastExprToType(LHS, RTy, CastExpr::CK_NullToMemberPointer);
1866 if (LMemPtr && RMemPtr) {
1867 QualType LPointee = LMemPtr->getPointeeType();
1868 QualType RPointee = RMemPtr->getPointeeType();
1870 QualifierCollector LPQuals, RPQuals;
1871 const Type *LPCan = LPQuals.strip(Context.getCanonicalType(LPointee));
1872 const Type *RPCan = RPQuals.strip(Context.getCanonicalType(RPointee));
1874 // First, we check that the unqualified pointee type is the same. If it's
1875 // not, there's no conversion that will unify the two pointers.
1876 if (LPCan == RPCan) {
1878 // Second, we take the greater of the two qualifications. If neither
1879 // is greater than the other, the conversion is not possible.
1881 Qualifiers MergedQuals = LPQuals + RPQuals;
1883 bool CompatibleQuals = true;
1884 if (MergedQuals.getCVRQualifiers() != LPQuals.getCVRQualifiers() &&
1885 MergedQuals.getCVRQualifiers() != RPQuals.getCVRQualifiers())
1886 CompatibleQuals = false;
1887 else if (LPQuals.getAddressSpace() != RPQuals.getAddressSpace())
1889 // C99 6.5.15 as modified by TR 18037:
1890 // If the second and third operands are pointers into different
1891 // address spaces, the address spaces must overlap.
1892 CompatibleQuals = false;
1893 // FIXME: GC qualifiers?
1895 if (CompatibleQuals) {
1896 // Third, we check if either of the container classes is derived from
1898 QualType LContainer(LMemPtr->getClass(), 0);
1899 QualType RContainer(RMemPtr->getClass(), 0);
1900 QualType MoreDerived;
1901 if (Context.getCanonicalType(LContainer) ==
1902 Context.getCanonicalType(RContainer))
1903 MoreDerived = LContainer;
1904 else if (IsDerivedFrom(LContainer, RContainer))
1905 MoreDerived = LContainer;
1906 else if (IsDerivedFrom(RContainer, LContainer))
1907 MoreDerived = RContainer;
1909 if (!MoreDerived.isNull()) {
1910 // The type 'Q Pointee (MoreDerived::*)' is the common type.
1911 // We don't use ImpCastExprToType here because this could still fail
1912 // for ambiguous or inaccessible conversions.
1913 LPointee = Context.getQualifiedType(LPointee, MergedQuals);
1915 = Context.getMemberPointerType(LPointee, MoreDerived.getTypePtr());
1916 if (PerformImplicitConversion(LHS, Common, Sema::AA_Converting))
1918 if (PerformImplicitConversion(RHS, Common, Sema::AA_Converting))
1926 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
1927 << LHS->getType() << RHS->getType()
1928 << LHS->getSourceRange() << RHS->getSourceRange();
1932 /// \brief Find a merged pointer type and convert the two expressions to it.
1934 /// This finds the composite pointer type (or member pointer type) for @p E1
1935 /// and @p E2 according to C++0x 5.9p2. It converts both expressions to this
1936 /// type and returns it.
1937 /// It does not emit diagnostics.
1938 QualType Sema::FindCompositePointerType(Expr *&E1, Expr *&E2) {
1939 assert(getLangOptions().CPlusPlus && "This function assumes C++");
1940 QualType T1 = E1->getType(), T2 = E2->getType();
1942 if (!T1->isAnyPointerType() && !T1->isMemberPointerType() &&
1943 !T2->isAnyPointerType() && !T2->isMemberPointerType())
1947 // Pointer conversions and qualification conversions are performed on
1948 // pointer operands to bring them to their composite pointer type. If
1949 // one operand is a null pointer constant, the composite pointer type is
1950 // the type of the other operand.
1951 if (E1->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
1952 if (T2->isMemberPointerType())
1953 ImpCastExprToType(E1, T2, CastExpr::CK_NullToMemberPointer);
1955 ImpCastExprToType(E1, T2, CastExpr::CK_IntegralToPointer);
1958 if (E2->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
1959 if (T1->isMemberPointerType())
1960 ImpCastExprToType(E2, T1, CastExpr::CK_NullToMemberPointer);
1962 ImpCastExprToType(E2, T1, CastExpr::CK_IntegralToPointer);
1966 // Now both have to be pointers or member pointers.
1967 if ((!T1->isPointerType() && !T1->isMemberPointerType()) ||
1968 (!T2->isPointerType() && !T2->isMemberPointerType()))
1971 // Otherwise, of one of the operands has type "pointer to cv1 void," then
1972 // the other has type "pointer to cv2 T" and the composite pointer type is
1973 // "pointer to cv12 void," where cv12 is the union of cv1 and cv2.
1974 // Otherwise, the composite pointer type is a pointer type similar to the
1975 // type of one of the operands, with a cv-qualification signature that is
1976 // the union of the cv-qualification signatures of the operand types.
1977 // In practice, the first part here is redundant; it's subsumed by the second.
1978 // What we do here is, we build the two possible composite types, and try the
1979 // conversions in both directions. If only one works, or if the two composite
1980 // types are the same, we have succeeded.
1981 // FIXME: extended qualifiers?
1982 typedef llvm::SmallVector<unsigned, 4> QualifierVector;
1983 QualifierVector QualifierUnion;
1984 typedef llvm::SmallVector<std::pair<const Type *, const Type *>, 4>
1985 ContainingClassVector;
1986 ContainingClassVector MemberOfClass;
1987 QualType Composite1 = Context.getCanonicalType(T1),
1988 Composite2 = Context.getCanonicalType(T2);
1990 const PointerType *Ptr1, *Ptr2;
1991 if ((Ptr1 = Composite1->getAs<PointerType>()) &&
1992 (Ptr2 = Composite2->getAs<PointerType>())) {
1993 Composite1 = Ptr1->getPointeeType();
1994 Composite2 = Ptr2->getPointeeType();
1995 QualifierUnion.push_back(
1996 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
1997 MemberOfClass.push_back(std::make_pair((const Type *)0, (const Type *)0));
2001 const MemberPointerType *MemPtr1, *MemPtr2;
2002 if ((MemPtr1 = Composite1->getAs<MemberPointerType>()) &&
2003 (MemPtr2 = Composite2->getAs<MemberPointerType>())) {
2004 Composite1 = MemPtr1->getPointeeType();
2005 Composite2 = MemPtr2->getPointeeType();
2006 QualifierUnion.push_back(
2007 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
2008 MemberOfClass.push_back(std::make_pair(MemPtr1->getClass(),
2009 MemPtr2->getClass()));
2013 // FIXME: block pointer types?
2015 // Cannot unwrap any more types.
2019 // Rewrap the composites as pointers or member pointers with the union CVRs.
2020 ContainingClassVector::reverse_iterator MOC
2021 = MemberOfClass.rbegin();
2022 for (QualifierVector::reverse_iterator
2023 I = QualifierUnion.rbegin(),
2024 E = QualifierUnion.rend();
2025 I != E; (void)++I, ++MOC) {
2026 Qualifiers Quals = Qualifiers::fromCVRMask(*I);
2027 if (MOC->first && MOC->second) {
2028 // Rebuild member pointer type
2029 Composite1 = Context.getMemberPointerType(
2030 Context.getQualifiedType(Composite1, Quals),
2032 Composite2 = Context.getMemberPointerType(
2033 Context.getQualifiedType(Composite2, Quals),
2036 // Rebuild pointer type
2038 = Context.getPointerType(Context.getQualifiedType(Composite1, Quals));
2040 = Context.getPointerType(Context.getQualifiedType(Composite2, Quals));
2044 ImplicitConversionSequence E1ToC1 =
2045 TryImplicitConversion(E1, Composite1,
2046 /*SuppressUserConversions=*/false,
2047 /*AllowExplicit=*/false,
2048 /*ForceRValue=*/false,
2049 /*InOverloadResolution=*/false);
2050 ImplicitConversionSequence E2ToC1 =
2051 TryImplicitConversion(E2, Composite1,
2052 /*SuppressUserConversions=*/false,
2053 /*AllowExplicit=*/false,
2054 /*ForceRValue=*/false,
2055 /*InOverloadResolution=*/false);
2057 ImplicitConversionSequence E1ToC2, E2ToC2;
2058 E1ToC2.ConversionKind = ImplicitConversionSequence::BadConversion;
2059 E2ToC2.ConversionKind = ImplicitConversionSequence::BadConversion;
2060 if (Context.getCanonicalType(Composite1) !=
2061 Context.getCanonicalType(Composite2)) {
2062 E1ToC2 = TryImplicitConversion(E1, Composite2,
2063 /*SuppressUserConversions=*/false,
2064 /*AllowExplicit=*/false,
2065 /*ForceRValue=*/false,
2066 /*InOverloadResolution=*/false);
2067 E2ToC2 = TryImplicitConversion(E2, Composite2,
2068 /*SuppressUserConversions=*/false,
2069 /*AllowExplicit=*/false,
2070 /*ForceRValue=*/false,
2071 /*InOverloadResolution=*/false);
2074 bool ToC1Viable = E1ToC1.ConversionKind !=
2075 ImplicitConversionSequence::BadConversion
2076 && E2ToC1.ConversionKind !=
2077 ImplicitConversionSequence::BadConversion;
2078 bool ToC2Viable = E1ToC2.ConversionKind !=
2079 ImplicitConversionSequence::BadConversion
2080 && E2ToC2.ConversionKind !=
2081 ImplicitConversionSequence::BadConversion;
2082 if (ToC1Viable && !ToC2Viable) {
2083 if (!PerformImplicitConversion(E1, Composite1, E1ToC1, Sema::AA_Converting) &&
2084 !PerformImplicitConversion(E2, Composite1, E2ToC1, Sema::AA_Converting))
2087 if (ToC2Viable && !ToC1Viable) {
2088 if (!PerformImplicitConversion(E1, Composite2, E1ToC2, Sema::AA_Converting) &&
2089 !PerformImplicitConversion(E2, Composite2, E2ToC2, Sema::AA_Converting))
2095 Sema::OwningExprResult Sema::MaybeBindToTemporary(Expr *E) {
2096 if (!Context.getLangOptions().CPlusPlus)
2099 assert(!isa<CXXBindTemporaryExpr>(E) && "Double-bound temporary?");
2101 const RecordType *RT = E->getType()->getAs<RecordType>();
2105 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
2106 if (RD->hasTrivialDestructor())
2109 if (CallExpr *CE = dyn_cast<CallExpr>(E)) {
2110 QualType Ty = CE->getCallee()->getType();
2111 if (const PointerType *PT = Ty->getAs<PointerType>())
2112 Ty = PT->getPointeeType();
2114 const FunctionType *FTy = Ty->getAs<FunctionType>();
2115 if (FTy->getResultType()->isReferenceType())
2118 CXXTemporary *Temp = CXXTemporary::Create(Context,
2119 RD->getDestructor(Context));
2120 ExprTemporaries.push_back(Temp);
2121 if (CXXDestructorDecl *Destructor =
2122 const_cast<CXXDestructorDecl*>(RD->getDestructor(Context)))
2123 MarkDeclarationReferenced(E->getExprLoc(), Destructor);
2124 // FIXME: Add the temporary to the temporaries vector.
2125 return Owned(CXXBindTemporaryExpr::Create(Context, Temp, E));
2128 Expr *Sema::MaybeCreateCXXExprWithTemporaries(Expr *SubExpr) {
2129 assert(SubExpr && "sub expression can't be null!");
2131 unsigned FirstTemporary = ExprEvalContexts.back().NumTemporaries;
2132 assert(ExprTemporaries.size() >= FirstTemporary);
2133 if (ExprTemporaries.size() == FirstTemporary)
2136 Expr *E = CXXExprWithTemporaries::Create(Context, SubExpr,
2137 &ExprTemporaries[FirstTemporary],
2138 ExprTemporaries.size() - FirstTemporary);
2139 ExprTemporaries.erase(ExprTemporaries.begin() + FirstTemporary,
2140 ExprTemporaries.end());
2145 Sema::OwningExprResult
2146 Sema::MaybeCreateCXXExprWithTemporaries(OwningExprResult SubExpr) {
2147 if (SubExpr.isInvalid())
2150 return Owned(MaybeCreateCXXExprWithTemporaries(SubExpr.takeAs<Expr>()));
2153 FullExpr Sema::CreateFullExpr(Expr *SubExpr) {
2154 unsigned FirstTemporary = ExprEvalContexts.back().NumTemporaries;
2155 assert(ExprTemporaries.size() >= FirstTemporary);
2157 unsigned NumTemporaries = ExprTemporaries.size() - FirstTemporary;
2158 CXXTemporary **Temporaries =
2159 NumTemporaries == 0 ? 0 : &ExprTemporaries[FirstTemporary];
2161 FullExpr E = FullExpr::Create(Context, SubExpr, Temporaries, NumTemporaries);
2163 ExprTemporaries.erase(ExprTemporaries.begin() + FirstTemporary,
2164 ExprTemporaries.end());
2169 Sema::OwningExprResult
2170 Sema::ActOnStartCXXMemberReference(Scope *S, ExprArg Base, SourceLocation OpLoc,
2171 tok::TokenKind OpKind, TypeTy *&ObjectType) {
2172 // Since this might be a postfix expression, get rid of ParenListExprs.
2173 Base = MaybeConvertParenListExprToParenExpr(S, move(Base));
2175 Expr *BaseExpr = (Expr*)Base.get();
2176 assert(BaseExpr && "no record expansion");
2178 QualType BaseType = BaseExpr->getType();
2179 if (BaseType->isDependentType()) {
2180 // If we have a pointer to a dependent type and are using the -> operator,
2181 // the object type is the type that the pointer points to. We might still
2182 // have enough information about that type to do something useful.
2183 if (OpKind == tok::arrow)
2184 if (const PointerType *Ptr = BaseType->getAs<PointerType>())
2185 BaseType = Ptr->getPointeeType();
2187 ObjectType = BaseType.getAsOpaquePtr();
2191 // C++ [over.match.oper]p8:
2192 // [...] When operator->returns, the operator-> is applied to the value
2193 // returned, with the original second operand.
2194 if (OpKind == tok::arrow) {
2195 // The set of types we've considered so far.
2196 llvm::SmallPtrSet<CanQualType,8> CTypes;
2197 llvm::SmallVector<SourceLocation, 8> Locations;
2198 CTypes.insert(Context.getCanonicalType(BaseType));
2200 while (BaseType->isRecordType()) {
2201 Base = BuildOverloadedArrowExpr(S, move(Base), OpLoc);
2202 BaseExpr = (Expr*)Base.get();
2203 if (BaseExpr == NULL)
2205 if (CXXOperatorCallExpr *OpCall = dyn_cast<CXXOperatorCallExpr>(BaseExpr))
2206 Locations.push_back(OpCall->getDirectCallee()->getLocation());
2207 BaseType = BaseExpr->getType();
2208 CanQualType CBaseType = Context.getCanonicalType(BaseType);
2209 if (!CTypes.insert(CBaseType)) {
2210 Diag(OpLoc, diag::err_operator_arrow_circular);
2211 for (unsigned i = 0; i < Locations.size(); i++)
2212 Diag(Locations[i], diag::note_declared_at);
2217 if (BaseType->isPointerType())
2218 BaseType = BaseType->getPointeeType();
2221 // We could end up with various non-record types here, such as extended
2222 // vector types or Objective-C interfaces. Just return early and let
2223 // ActOnMemberReferenceExpr do the work.
2224 if (!BaseType->isRecordType()) {
2225 // C++ [basic.lookup.classref]p2:
2226 // [...] If the type of the object expression is of pointer to scalar
2227 // type, the unqualified-id is looked up in the context of the complete
2228 // postfix-expression.
2233 // The object type must be complete (or dependent).
2234 if (!BaseType->isDependentType() &&
2235 RequireCompleteType(OpLoc, BaseType,
2236 PDiag(diag::err_incomplete_member_access)))
2239 // C++ [basic.lookup.classref]p2:
2240 // If the id-expression in a class member access (5.2.5) is an
2241 // unqualified-id, and the type of the object expression is of a class
2242 // type C (or of pointer to a class type C), the unqualified-id is looked
2243 // up in the scope of class C. [...]
2244 ObjectType = BaseType.getAsOpaquePtr();
2249 CXXMemberCallExpr *Sema::BuildCXXMemberCallExpr(Expr *Exp,
2250 CXXMethodDecl *Method) {
2251 if (PerformObjectArgumentInitialization(Exp, Method))
2252 assert(0 && "Calling BuildCXXMemberCallExpr with invalid call?");
2255 new (Context) MemberExpr(Exp, /*IsArrow=*/false, Method,
2256 SourceLocation(), Method->getType());
2257 QualType ResultType = Method->getResultType().getNonReferenceType();
2258 MarkDeclarationReferenced(Exp->getLocStart(), Method);
2259 CXXMemberCallExpr *CE =
2260 new (Context) CXXMemberCallExpr(Context, ME, 0, 0, ResultType,
2265 Sema::OwningExprResult Sema::BuildCXXCastArgument(SourceLocation CastLoc,
2267 CastExpr::CastKind Kind,
2268 CXXMethodDecl *Method,
2270 Expr *From = Arg.takeAs<Expr>();
2273 default: assert(0 && "Unhandled cast kind!");
2274 case CastExpr::CK_ConstructorConversion: {
2275 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
2277 if (CompleteConstructorCall(cast<CXXConstructorDecl>(Method),
2278 MultiExprArg(*this, (void **)&From, 1),
2279 CastLoc, ConstructorArgs))
2282 OwningExprResult Result =
2283 BuildCXXConstructExpr(CastLoc, Ty, cast<CXXConstructorDecl>(Method),
2284 move_arg(ConstructorArgs));
2285 if (Result.isInvalid())
2288 return MaybeBindToTemporary(Result.takeAs<Expr>());
2291 case CastExpr::CK_UserDefinedConversion: {
2292 assert(!From->getType()->isPointerType() && "Arg can't have pointer type!");
2294 // Create an implicit call expr that calls it.
2295 CXXMemberCallExpr *CE = BuildCXXMemberCallExpr(From, Method);
2296 return MaybeBindToTemporary(CE);
2301 Sema::OwningExprResult Sema::ActOnFinishFullExpr(ExprArg Arg) {
2302 Expr *FullExpr = Arg.takeAs<Expr>();
2304 FullExpr = MaybeCreateCXXExprWithTemporaries(FullExpr);
2306 return Owned(FullExpr);
2309 /// \brief Determine whether a reference to the given declaration in the
2310 /// current context is an implicit member access
2311 /// (C++ [class.mfct.non-static]p2).
2313 /// FIXME: Should Objective-C also use this approach?
2315 /// \param D the declaration being referenced from the current scope.
2317 /// \param NameLoc the location of the name in the source.
2319 /// \param ThisType if the reference to this declaration is an implicit member
2320 /// access, will be set to the type of the "this" pointer to be used when
2321 /// building that implicit member access.
2323 /// \returns true if this is an implicit member reference (in which case
2324 /// \p ThisType and \p MemberType will be set), or false if it is not an
2325 /// implicit member reference.
2326 bool Sema::isImplicitMemberReference(const LookupResult &R,
2327 QualType &ThisType) {
2328 // If this isn't a C++ method, then it isn't an implicit member reference.
2329 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext);
2330 if (!MD || MD->isStatic())
2333 // C++ [class.mfct.nonstatic]p2:
2334 // [...] if name lookup (3.4.1) resolves the name in the
2335 // id-expression to a nonstatic nontype member of class X or of
2336 // a base class of X, the id-expression is transformed into a
2337 // class member access expression (5.2.5) using (*this) (9.3.2)
2338 // as the postfix-expression to the left of the '.' operator.
2339 DeclContext *Ctx = 0;
2340 if (R.isUnresolvableResult()) {
2341 // FIXME: this is just picking one at random
2342 Ctx = R.getRepresentativeDecl()->getDeclContext();
2343 } else if (FieldDecl *FD = R.getAsSingle<FieldDecl>()) {
2344 Ctx = FD->getDeclContext();
2346 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
2347 CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(*I);
2348 FunctionTemplateDecl *FunTmpl = 0;
2349 if (!Method && (FunTmpl = dyn_cast<FunctionTemplateDecl>(*I)))
2350 Method = dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl());
2352 // FIXME: Do we have to know if there are explicit template arguments?
2353 if (Method && !Method->isStatic()) {
2354 Ctx = Method->getParent();
2360 if (!Ctx || !Ctx->isRecord())
2363 // Determine whether the declaration(s) we found are actually in a base
2364 // class. If not, this isn't an implicit member reference.
2365 ThisType = MD->getThisType(Context);
2367 // FIXME: this doesn't really work for overloaded lookups.
2369 QualType CtxType = Context.getTypeDeclType(cast<CXXRecordDecl>(Ctx));
2371 = Context.getTypeDeclType(cast<CXXRecordDecl>(MD->getParent()));
2372 return Context.hasSameType(CtxType, ClassType) ||
2373 IsDerivedFrom(ClassType, CtxType);