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/AST/TypeLoc.h"
21 #include "clang/Basic/PartialDiagnostic.h"
22 #include "clang/Basic/TargetInfo.h"
23 #include "clang/Lex/Preprocessor.h"
24 #include "clang/Parse/DeclSpec.h"
25 #include "clang/Parse/Template.h"
26 #include "llvm/ADT/STLExtras.h"
27 using namespace clang;
29 Action::TypeTy *Sema::getDestructorName(SourceLocation TildeLoc,
31 SourceLocation NameLoc,
32 Scope *S, CXXScopeSpec &SS,
33 TypeTy *ObjectTypePtr,
34 bool EnteringContext) {
35 // Determine where to perform name lookup.
37 // FIXME: This area of the standard is very messy, and the current
38 // wording is rather unclear about which scopes we search for the
39 // destructor name; see core issues 399 and 555. Issue 399 in
40 // particular shows where the current description of destructor name
41 // lookup is completely out of line with existing practice, e.g.,
42 // this appears to be ill-formed:
45 // template <typename T> struct S {
50 // void f(N::S<int>* s) {
51 // s->N::S<int>::~S();
54 // See also PR6358 and PR6359.
56 DeclContext *LookupCtx = 0;
57 bool isDependent = false;
58 bool LookInScope = false;
60 // If we have an object type, it's because we are in a
61 // pseudo-destructor-expression or a member access expression, and
62 // we know what type we're looking for.
64 SearchType = GetTypeFromParser(ObjectTypePtr);
67 NestedNameSpecifier *NNS = (NestedNameSpecifier *)SS.getScopeRep();
69 bool AlreadySearched = false;
70 bool LookAtPrefix = true;
71 if (!getLangOptions().CPlusPlus0x) {
72 // C++ [basic.lookup.qual]p6:
73 // If a pseudo-destructor-name (5.2.4) contains a nested-name-specifier,
74 // the type-names are looked up as types in the scope designated by the
75 // nested-name-specifier. In a qualified-id of the form:
77 // ::[opt] nested-name-specifier ̃ class-name
79 // where the nested-name-specifier designates a namespace scope, and in
80 // a qualified-id of the form:
82 // ::opt nested-name-specifier class-name :: ̃ class-name
84 // the class-names are looked up as types in the scope designated by
85 // the nested-name-specifier.
87 // Here, we check the first case (completely) and determine whether the
88 // code below is permitted to look at the prefix of the
89 // nested-name-specifier (as we do in C++0x).
90 DeclContext *DC = computeDeclContext(SS, EnteringContext);
91 if (DC && DC->isFileContext()) {
92 AlreadySearched = true;
95 } else if (DC && isa<CXXRecordDecl>(DC))
99 // C++0x [basic.lookup.qual]p6:
100 // If a pseudo-destructor-name (5.2.4) contains a
101 // nested-name-specifier, the type-names are looked up as types
102 // in the scope designated by the nested-name-specifier. Similarly, in
103 // a qualified-id of the form:
105 // :: [opt] nested-name-specifier[opt] class-name :: ~class-name
107 // the second class-name is looked up in the same scope as the first.
109 // To implement this, we look at the prefix of the
110 // nested-name-specifier we were given, and determine the lookup
111 // context from that.
113 // We also fold in the second case from the C++03 rules quoted further
115 NestedNameSpecifier *Prefix = 0;
116 if (AlreadySearched) {
117 // Nothing left to do.
118 } else if (LookAtPrefix && (Prefix = NNS->getPrefix())) {
119 CXXScopeSpec PrefixSS;
120 PrefixSS.setScopeRep(Prefix);
121 LookupCtx = computeDeclContext(PrefixSS, EnteringContext);
122 isDependent = isDependentScopeSpecifier(PrefixSS);
123 } else if (getLangOptions().CPlusPlus0x &&
124 (LookupCtx = computeDeclContext(SS, EnteringContext))) {
125 if (!LookupCtx->isTranslationUnit())
126 LookupCtx = LookupCtx->getParent();
127 isDependent = LookupCtx && LookupCtx->isDependentContext();
128 } else if (ObjectTypePtr) {
129 LookupCtx = computeDeclContext(SearchType);
130 isDependent = SearchType->isDependentType();
132 LookupCtx = computeDeclContext(SS, EnteringContext);
133 isDependent = LookupCtx && LookupCtx->isDependentContext();
137 } else if (ObjectTypePtr) {
138 // C++ [basic.lookup.classref]p3:
139 // If the unqualified-id is ~type-name, the type-name is looked up
140 // in the context of the entire postfix-expression. If the type T
141 // of the object expression is of a class type C, the type-name is
142 // also looked up in the scope of class C. At least one of the
143 // lookups shall find a name that refers to (possibly
145 LookupCtx = computeDeclContext(SearchType);
146 isDependent = SearchType->isDependentType();
147 assert((isDependent || !SearchType->isIncompleteType()) &&
148 "Caller should have completed object type");
152 // Perform lookup into the current scope (only).
156 LookupResult Found(*this, &II, NameLoc, LookupOrdinaryName);
157 for (unsigned Step = 0; Step != 2; ++Step) {
158 // Look for the name first in the computed lookup context (if we
159 // have one) and, if that fails to find a match, in the sope (if
160 // we're allowed to look there).
162 if (Step == 0 && LookupCtx)
163 LookupQualifiedName(Found, LookupCtx);
164 else if (Step == 1 && LookInScope && S)
165 LookupName(Found, S);
169 // FIXME: Should we be suppressing ambiguities here?
170 if (Found.isAmbiguous())
173 if (TypeDecl *Type = Found.getAsSingle<TypeDecl>()) {
174 QualType T = Context.getTypeDeclType(Type);
176 if (SearchType.isNull() || SearchType->isDependentType() ||
177 Context.hasSameUnqualifiedType(T, SearchType)) {
178 // We found our type!
180 return T.getAsOpaquePtr();
184 // If the name that we found is a class template name, and it is
185 // the same name as the template name in the last part of the
186 // nested-name-specifier (if present) or the object type, then
187 // this is the destructor for that class.
188 // FIXME: This is a workaround until we get real drafting for core
189 // issue 399, for which there isn't even an obvious direction.
190 if (ClassTemplateDecl *Template = Found.getAsSingle<ClassTemplateDecl>()) {
191 QualType MemberOfType;
193 if (DeclContext *Ctx = computeDeclContext(SS, EnteringContext)) {
194 // Figure out the type of the context, if it has one.
195 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx))
196 MemberOfType = Context.getTypeDeclType(Record);
199 if (MemberOfType.isNull())
200 MemberOfType = SearchType;
202 if (MemberOfType.isNull())
205 // We're referring into a class template specialization. If the
206 // class template we found is the same as the template being
207 // specialized, we found what we are looking for.
208 if (const RecordType *Record = MemberOfType->getAs<RecordType>()) {
209 if (ClassTemplateSpecializationDecl *Spec
210 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) {
211 if (Spec->getSpecializedTemplate()->getCanonicalDecl() ==
212 Template->getCanonicalDecl())
213 return MemberOfType.getAsOpaquePtr();
219 // We're referring to an unresolved class template
220 // specialization. Determine whether we class template we found
221 // is the same as the template being specialized or, if we don't
222 // know which template is being specialized, that it at least
223 // has the same name.
224 if (const TemplateSpecializationType *SpecType
225 = MemberOfType->getAs<TemplateSpecializationType>()) {
226 TemplateName SpecName = SpecType->getTemplateName();
228 // The class template we found is the same template being
230 if (TemplateDecl *SpecTemplate = SpecName.getAsTemplateDecl()) {
231 if (SpecTemplate->getCanonicalDecl() == Template->getCanonicalDecl())
232 return MemberOfType.getAsOpaquePtr();
237 // The class template we found has the same name as the
238 // (dependent) template name being specialized.
239 if (DependentTemplateName *DepTemplate
240 = SpecName.getAsDependentTemplateName()) {
241 if (DepTemplate->isIdentifier() &&
242 DepTemplate->getIdentifier() == Template->getIdentifier())
243 return MemberOfType.getAsOpaquePtr();
252 // We didn't find our type, but that's okay: it's dependent
254 NestedNameSpecifier *NNS = 0;
257 NNS = (NestedNameSpecifier *)SS.getScopeRep();
258 Range = SourceRange(SS.getRange().getBegin(), NameLoc);
260 NNS = NestedNameSpecifier::Create(Context, &II);
261 Range = SourceRange(NameLoc);
264 return CheckTypenameType(ETK_None, NNS, II, SourceLocation(),
265 Range, NameLoc).getAsOpaquePtr();
269 Diag(NameLoc, diag::err_ident_in_pseudo_dtor_not_a_type)
272 Diag(NameLoc, diag::err_destructor_class_name);
277 /// \brief Build a C++ typeid expression with a type operand.
278 Sema::OwningExprResult Sema::BuildCXXTypeId(QualType TypeInfoType,
279 SourceLocation TypeidLoc,
280 TypeSourceInfo *Operand,
281 SourceLocation RParenLoc) {
282 // C++ [expr.typeid]p4:
283 // The top-level cv-qualifiers of the lvalue expression or the type-id
284 // that is the operand of typeid are always ignored.
285 // If the type of the type-id is a class type or a reference to a class
286 // type, the class shall be completely-defined.
287 QualType T = Operand->getType().getNonReferenceType();
288 if (T->getAs<RecordType>() &&
289 RequireCompleteType(TypeidLoc, T, diag::err_incomplete_typeid))
292 return Owned(new (Context) CXXTypeidExpr(TypeInfoType.withConst(),
294 SourceRange(TypeidLoc, RParenLoc)));
297 /// \brief Build a C++ typeid expression with an expression operand.
298 Sema::OwningExprResult Sema::BuildCXXTypeId(QualType TypeInfoType,
299 SourceLocation TypeidLoc,
301 SourceLocation RParenLoc) {
302 bool isUnevaluatedOperand = true;
303 Expr *E = static_cast<Expr *>(Operand.get());
304 if (E && !E->isTypeDependent()) {
305 QualType T = E->getType();
306 if (const RecordType *RecordT = T->getAs<RecordType>()) {
307 CXXRecordDecl *RecordD = cast<CXXRecordDecl>(RecordT->getDecl());
308 // C++ [expr.typeid]p3:
309 // [...] If the type of the expression is a class type, the class
310 // shall be completely-defined.
311 if (RequireCompleteType(TypeidLoc, T, diag::err_incomplete_typeid))
314 // C++ [expr.typeid]p3:
315 // When typeid is applied to an expression other than an lvalue of a
316 // polymorphic class type [...] [the] expression is an unevaluated
318 if (RecordD->isPolymorphic() && E->isLvalue(Context) == Expr::LV_Valid) {
319 isUnevaluatedOperand = false;
321 // We require a vtable to query the type at run time.
322 MarkVTableUsed(TypeidLoc, RecordD);
326 // C++ [expr.typeid]p4:
327 // [...] If the type of the type-id is a reference to a possibly
328 // cv-qualified type, the result of the typeid expression refers to a
329 // std::type_info object representing the cv-unqualified referenced
331 if (T.hasQualifiers()) {
332 ImpCastExprToType(E, T.getUnqualifiedType(), CastExpr::CK_NoOp,
333 E->isLvalue(Context));
339 // If this is an unevaluated operand, clear out the set of
340 // declaration references we have been computing and eliminate any
341 // temporaries introduced in its computation.
342 if (isUnevaluatedOperand)
343 ExprEvalContexts.back().Context = Unevaluated;
345 return Owned(new (Context) CXXTypeidExpr(TypeInfoType.withConst(),
346 Operand.takeAs<Expr>(),
347 SourceRange(TypeidLoc, RParenLoc)));
350 /// ActOnCXXTypeidOfType - Parse typeid( type-id ) or typeid (expression);
351 Action::OwningExprResult
352 Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc,
353 bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
354 // Find the std::type_info type.
356 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
358 IdentifierInfo *TypeInfoII = &PP.getIdentifierTable().get("type_info");
359 LookupResult R(*this, TypeInfoII, SourceLocation(), LookupTagName);
360 LookupQualifiedName(R, StdNamespace);
361 RecordDecl *TypeInfoRecordDecl = R.getAsSingle<RecordDecl>();
362 if (!TypeInfoRecordDecl)
363 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
365 QualType TypeInfoType = Context.getTypeDeclType(TypeInfoRecordDecl);
368 // The operand is a type; handle it as such.
369 TypeSourceInfo *TInfo = 0;
370 QualType T = GetTypeFromParser(TyOrExpr, &TInfo);
375 TInfo = Context.getTrivialTypeSourceInfo(T, OpLoc);
377 return BuildCXXTypeId(TypeInfoType, OpLoc, TInfo, RParenLoc);
380 // The operand is an expression.
381 return BuildCXXTypeId(TypeInfoType, OpLoc, Owned((Expr*)TyOrExpr), RParenLoc);
384 /// ActOnCXXBoolLiteral - Parse {true,false} literals.
385 Action::OwningExprResult
386 Sema::ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
387 assert((Kind == tok::kw_true || Kind == tok::kw_false) &&
388 "Unknown C++ Boolean value!");
389 return Owned(new (Context) CXXBoolLiteralExpr(Kind == tok::kw_true,
390 Context.BoolTy, OpLoc));
393 /// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
394 Action::OwningExprResult
395 Sema::ActOnCXXNullPtrLiteral(SourceLocation Loc) {
396 return Owned(new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc));
399 /// ActOnCXXThrow - Parse throw expressions.
400 Action::OwningExprResult
401 Sema::ActOnCXXThrow(SourceLocation OpLoc, ExprArg E) {
402 Expr *Ex = E.takeAs<Expr>();
403 if (Ex && !Ex->isTypeDependent() && CheckCXXThrowOperand(OpLoc, Ex))
405 return Owned(new (Context) CXXThrowExpr(Ex, Context.VoidTy, OpLoc));
408 /// CheckCXXThrowOperand - Validate the operand of a throw.
409 bool Sema::CheckCXXThrowOperand(SourceLocation ThrowLoc, Expr *&E) {
410 // C++ [except.throw]p3:
411 // A throw-expression initializes a temporary object, called the exception
412 // object, the type of which is determined by removing any top-level
413 // cv-qualifiers from the static type of the operand of throw and adjusting
414 // the type from "array of T" or "function returning T" to "pointer to T"
415 // or "pointer to function returning T", [...]
416 if (E->getType().hasQualifiers())
417 ImpCastExprToType(E, E->getType().getUnqualifiedType(), CastExpr::CK_NoOp,
418 E->isLvalue(Context) == Expr::LV_Valid);
420 DefaultFunctionArrayConversion(E);
422 // If the type of the exception would be an incomplete type or a pointer
423 // to an incomplete type other than (cv) void the program is ill-formed.
424 QualType Ty = E->getType();
425 bool isPointer = false;
426 if (const PointerType* Ptr = Ty->getAs<PointerType>()) {
427 Ty = Ptr->getPointeeType();
430 if (!isPointer || !Ty->isVoidType()) {
431 if (RequireCompleteType(ThrowLoc, Ty,
432 PDiag(isPointer ? diag::err_throw_incomplete_ptr
433 : diag::err_throw_incomplete)
434 << E->getSourceRange()))
437 if (RequireNonAbstractType(ThrowLoc, E->getType(),
438 PDiag(diag::err_throw_abstract_type)
439 << E->getSourceRange()))
443 // Initialize the exception result. This implicitly weeds out
444 // abstract types or types with inaccessible copy constructors.
445 // FIXME: Determine whether we can elide this copy per C++0x [class.copy]p34.
446 InitializedEntity Entity =
447 InitializedEntity::InitializeException(ThrowLoc, E->getType(),
449 OwningExprResult Res = PerformCopyInitialization(Entity,
454 E = Res.takeAs<Expr>();
456 // If we are throwing a polymorphic class type or pointer thereof,
457 // exception handling will make use of the vtable.
458 if (const RecordType *RecordTy = Ty->getAs<RecordType>())
459 MarkVTableUsed(ThrowLoc, cast<CXXRecordDecl>(RecordTy->getDecl()));
464 Action::OwningExprResult Sema::ActOnCXXThis(SourceLocation ThisLoc) {
465 /// C++ 9.3.2: In the body of a non-static member function, the keyword this
466 /// is a non-lvalue expression whose value is the address of the object for
467 /// which the function is called.
469 DeclContext *DC = getFunctionLevelDeclContext();
470 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC))
471 if (MD->isInstance())
472 return Owned(new (Context) CXXThisExpr(ThisLoc,
473 MD->getThisType(Context),
474 /*isImplicit=*/false));
476 return ExprError(Diag(ThisLoc, diag::err_invalid_this_use));
479 /// ActOnCXXTypeConstructExpr - Parse construction of a specified type.
480 /// Can be interpreted either as function-style casting ("int(x)")
481 /// or class type construction ("ClassType(x,y,z)")
482 /// or creation of a value-initialized type ("int()").
483 Action::OwningExprResult
484 Sema::ActOnCXXTypeConstructExpr(SourceRange TypeRange, TypeTy *TypeRep,
485 SourceLocation LParenLoc,
487 SourceLocation *CommaLocs,
488 SourceLocation RParenLoc) {
492 TypeSourceInfo *TInfo;
493 QualType Ty = GetTypeFromParser(TypeRep, &TInfo);
495 TInfo = Context.getTrivialTypeSourceInfo(Ty, SourceLocation());
496 unsigned NumExprs = exprs.size();
497 Expr **Exprs = (Expr**)exprs.get();
498 SourceLocation TyBeginLoc = TypeRange.getBegin();
499 SourceRange FullRange = SourceRange(TyBeginLoc, RParenLoc);
501 if (Ty->isDependentType() ||
502 CallExpr::hasAnyTypeDependentArguments(Exprs, NumExprs)) {
505 return Owned(CXXUnresolvedConstructExpr::Create(Context,
506 TypeRange.getBegin(), Ty,
512 if (Ty->isArrayType())
513 return ExprError(Diag(TyBeginLoc,
514 diag::err_value_init_for_array_type) << FullRange);
515 if (!Ty->isVoidType() &&
516 RequireCompleteType(TyBeginLoc, Ty,
517 PDiag(diag::err_invalid_incomplete_type_use)
521 if (RequireNonAbstractType(TyBeginLoc, Ty,
522 diag::err_allocation_of_abstract_type))
526 // C++ [expr.type.conv]p1:
527 // If the expression list is a single expression, the type conversion
528 // expression is equivalent (in definedness, and if defined in meaning) to the
529 // corresponding cast expression.
532 CastExpr::CastKind Kind = CastExpr::CK_Unknown;
533 CXXBaseSpecifierArray BasePath;
534 if (CheckCastTypes(TypeRange, Ty, Exprs[0], Kind, BasePath,
535 /*FunctionalStyle=*/true))
540 return Owned(new (Context) CXXFunctionalCastExpr(Ty.getNonReferenceType(),
541 TInfo, TyBeginLoc, Kind,
546 if (const RecordType *RT = Ty->getAs<RecordType>()) {
547 CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl());
549 if (NumExprs > 1 || !Record->hasTrivialConstructor() ||
550 !Record->hasTrivialDestructor()) {
551 InitializedEntity Entity = InitializedEntity::InitializeTemporary(Ty);
552 InitializationKind Kind
553 = NumExprs ? InitializationKind::CreateDirect(TypeRange.getBegin(),
554 LParenLoc, RParenLoc)
555 : InitializationKind::CreateValue(TypeRange.getBegin(),
556 LParenLoc, RParenLoc);
557 InitializationSequence InitSeq(*this, Entity, Kind, Exprs, NumExprs);
558 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind,
561 // FIXME: Improve AST representation?
565 // Fall through to value-initialize an object of class type that
566 // doesn't have a user-declared default constructor.
569 // C++ [expr.type.conv]p1:
570 // If the expression list specifies more than a single value, the type shall
571 // be a class with a suitably declared constructor.
574 return ExprError(Diag(CommaLocs[0],
575 diag::err_builtin_func_cast_more_than_one_arg)
578 assert(NumExprs == 0 && "Expected 0 expressions");
579 // C++ [expr.type.conv]p2:
580 // The expression T(), where T is a simple-type-specifier for a non-array
581 // complete object type or the (possibly cv-qualified) void type, creates an
582 // rvalue of the specified type, which is value-initialized.
585 return Owned(new (Context) CXXZeroInitValueExpr(Ty, TyBeginLoc, RParenLoc));
589 /// ActOnCXXNew - Parsed a C++ 'new' expression (C++ 5.3.4), as in e.g.:
590 /// @code new (memory) int[size][4] @endcode
592 /// @code ::new Foo(23, "hello") @endcode
593 /// For the interpretation of this heap of arguments, consult the base version.
594 Action::OwningExprResult
595 Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
596 SourceLocation PlacementLParen, MultiExprArg PlacementArgs,
597 SourceLocation PlacementRParen, bool ParenTypeId,
598 Declarator &D, SourceLocation ConstructorLParen,
599 MultiExprArg ConstructorArgs,
600 SourceLocation ConstructorRParen) {
602 // If the specified type is an array, unwrap it and save the expression.
603 if (D.getNumTypeObjects() > 0 &&
604 D.getTypeObject(0).Kind == DeclaratorChunk::Array) {
605 DeclaratorChunk &Chunk = D.getTypeObject(0);
606 if (Chunk.Arr.hasStatic)
607 return ExprError(Diag(Chunk.Loc, diag::err_static_illegal_in_new)
608 << D.getSourceRange());
609 if (!Chunk.Arr.NumElts)
610 return ExprError(Diag(Chunk.Loc, diag::err_array_new_needs_size)
611 << D.getSourceRange());
614 // Can't have dynamic array size when the type-id is in parentheses.
615 Expr *NumElts = (Expr *)Chunk.Arr.NumElts;
616 if (!NumElts->isTypeDependent() && !NumElts->isValueDependent() &&
617 !NumElts->isIntegerConstantExpr(Context)) {
618 Diag(D.getTypeObject(0).Loc, diag::err_new_paren_array_nonconst)
619 << NumElts->getSourceRange();
624 ArraySize = static_cast<Expr*>(Chunk.Arr.NumElts);
625 D.DropFirstTypeObject();
628 // Every dimension shall be of constant size.
630 for (unsigned I = 0, N = D.getNumTypeObjects(); I < N; ++I) {
631 if (D.getTypeObject(I).Kind != DeclaratorChunk::Array)
634 DeclaratorChunk::ArrayTypeInfo &Array = D.getTypeObject(I).Arr;
635 if (Expr *NumElts = (Expr *)Array.NumElts) {
636 if (!NumElts->isTypeDependent() && !NumElts->isValueDependent() &&
637 !NumElts->isIntegerConstantExpr(Context)) {
638 Diag(D.getTypeObject(I).Loc, diag::err_new_array_nonconst)
639 << NumElts->getSourceRange();
646 //FIXME: Store TypeSourceInfo in CXXNew expression.
647 TypeSourceInfo *TInfo = 0;
648 QualType AllocType = GetTypeForDeclarator(D, /*Scope=*/0, &TInfo);
649 if (D.isInvalidType())
652 return BuildCXXNew(StartLoc, UseGlobal,
658 D.getSourceRange().getBegin(),
662 move(ConstructorArgs),
666 Sema::OwningExprResult
667 Sema::BuildCXXNew(SourceLocation StartLoc, bool UseGlobal,
668 SourceLocation PlacementLParen,
669 MultiExprArg PlacementArgs,
670 SourceLocation PlacementRParen,
673 SourceLocation TypeLoc,
674 SourceRange TypeRange,
676 SourceLocation ConstructorLParen,
677 MultiExprArg ConstructorArgs,
678 SourceLocation ConstructorRParen) {
679 if (CheckAllocatedType(AllocType, TypeLoc, TypeRange))
682 // Per C++0x [expr.new]p5, the type being constructed may be a
683 // typedef of an array type.
684 if (!ArraySizeE.get()) {
685 if (const ConstantArrayType *Array
686 = Context.getAsConstantArrayType(AllocType)) {
687 ArraySizeE = Owned(new (Context) IntegerLiteral(Array->getSize(),
688 Context.getSizeType(),
689 TypeRange.getEnd()));
690 AllocType = Array->getElementType();
694 QualType ResultType = Context.getPointerType(AllocType);
696 // C++ 5.3.4p6: "The expression in a direct-new-declarator shall have integral
697 // or enumeration type with a non-negative value."
698 Expr *ArraySize = (Expr *)ArraySizeE.get();
699 if (ArraySize && !ArraySize->isTypeDependent()) {
700 QualType SizeType = ArraySize->getType();
701 if (!SizeType->isIntegralType() && !SizeType->isEnumeralType())
702 return ExprError(Diag(ArraySize->getSourceRange().getBegin(),
703 diag::err_array_size_not_integral)
704 << SizeType << ArraySize->getSourceRange());
705 // Let's see if this is a constant < 0. If so, we reject it out of hand.
706 // We don't care about special rules, so we tell the machinery it's not
707 // evaluated - it gives us a result in more cases.
708 if (!ArraySize->isValueDependent()) {
710 if (ArraySize->isIntegerConstantExpr(Value, Context, 0, false)) {
711 if (Value < llvm::APSInt(
712 llvm::APInt::getNullValue(Value.getBitWidth()),
714 return ExprError(Diag(ArraySize->getSourceRange().getBegin(),
715 diag::err_typecheck_negative_array_size)
716 << ArraySize->getSourceRange());
720 ImpCastExprToType(ArraySize, Context.getSizeType(),
721 CastExpr::CK_IntegralCast);
724 FunctionDecl *OperatorNew = 0;
725 FunctionDecl *OperatorDelete = 0;
726 Expr **PlaceArgs = (Expr**)PlacementArgs.get();
727 unsigned NumPlaceArgs = PlacementArgs.size();
729 if (!AllocType->isDependentType() &&
730 !Expr::hasAnyTypeDependentArguments(PlaceArgs, NumPlaceArgs) &&
731 FindAllocationFunctions(StartLoc,
732 SourceRange(PlacementLParen, PlacementRParen),
733 UseGlobal, AllocType, ArraySize, PlaceArgs,
734 NumPlaceArgs, OperatorNew, OperatorDelete))
736 llvm::SmallVector<Expr *, 8> AllPlaceArgs;
738 // Add default arguments, if any.
739 const FunctionProtoType *Proto =
740 OperatorNew->getType()->getAs<FunctionProtoType>();
741 VariadicCallType CallType =
742 Proto->isVariadic() ? VariadicFunction : VariadicDoesNotApply;
744 if (GatherArgumentsForCall(PlacementLParen, OperatorNew,
745 Proto, 1, PlaceArgs, NumPlaceArgs,
746 AllPlaceArgs, CallType))
749 NumPlaceArgs = AllPlaceArgs.size();
750 if (NumPlaceArgs > 0)
751 PlaceArgs = &AllPlaceArgs[0];
754 bool Init = ConstructorLParen.isValid();
755 // --- Choosing a constructor ---
756 CXXConstructorDecl *Constructor = 0;
757 Expr **ConsArgs = (Expr**)ConstructorArgs.get();
758 unsigned NumConsArgs = ConstructorArgs.size();
759 ASTOwningVector<&ActionBase::DeleteExpr> ConvertedConstructorArgs(*this);
761 // Array 'new' can't have any initializers.
762 if (NumConsArgs && (ResultType->isArrayType() || ArraySize)) {
763 SourceRange InitRange(ConsArgs[0]->getLocStart(),
764 ConsArgs[NumConsArgs - 1]->getLocEnd());
766 Diag(StartLoc, diag::err_new_array_init_args) << InitRange;
770 if (!AllocType->isDependentType() &&
771 !Expr::hasAnyTypeDependentArguments(ConsArgs, NumConsArgs)) {
772 // C++0x [expr.new]p15:
773 // A new-expression that creates an object of type T initializes that
774 // object as follows:
775 InitializationKind Kind
776 // - If the new-initializer is omitted, the object is default-
777 // initialized (8.5); if no initialization is performed,
778 // the object has indeterminate value
779 = !Init? InitializationKind::CreateDefault(TypeLoc)
780 // - Otherwise, the new-initializer is interpreted according to the
781 // initialization rules of 8.5 for direct-initialization.
782 : InitializationKind::CreateDirect(TypeLoc,
786 InitializedEntity Entity
787 = InitializedEntity::InitializeNew(StartLoc, AllocType);
788 InitializationSequence InitSeq(*this, Entity, Kind, ConsArgs, NumConsArgs);
789 OwningExprResult FullInit = InitSeq.Perform(*this, Entity, Kind,
790 move(ConstructorArgs));
791 if (FullInit.isInvalid())
794 // FullInit is our initializer; walk through it to determine if it's a
795 // constructor call, which CXXNewExpr handles directly.
796 if (Expr *FullInitExpr = (Expr *)FullInit.get()) {
797 if (CXXBindTemporaryExpr *Binder
798 = dyn_cast<CXXBindTemporaryExpr>(FullInitExpr))
799 FullInitExpr = Binder->getSubExpr();
800 if (CXXConstructExpr *Construct
801 = dyn_cast<CXXConstructExpr>(FullInitExpr)) {
802 Constructor = Construct->getConstructor();
803 for (CXXConstructExpr::arg_iterator A = Construct->arg_begin(),
804 AEnd = Construct->arg_end();
806 ConvertedConstructorArgs.push_back(A->Retain());
808 // Take the converted initializer.
809 ConvertedConstructorArgs.push_back(FullInit.release());
812 // No initialization required.
815 // Take the converted arguments and use them for the new expression.
816 NumConsArgs = ConvertedConstructorArgs.size();
817 ConsArgs = (Expr **)ConvertedConstructorArgs.take();
820 // Mark the new and delete operators as referenced.
822 MarkDeclarationReferenced(StartLoc, OperatorNew);
824 MarkDeclarationReferenced(StartLoc, OperatorDelete);
826 // FIXME: Also check that the destructor is accessible. (C++ 5.3.4p16)
828 PlacementArgs.release();
829 ConstructorArgs.release();
830 ArraySizeE.release();
831 return Owned(new (Context) CXXNewExpr(Context, UseGlobal, OperatorNew,
832 PlaceArgs, NumPlaceArgs, ParenTypeId,
833 ArraySize, Constructor, Init,
834 ConsArgs, NumConsArgs, OperatorDelete,
835 ResultType, StartLoc,
836 Init ? ConstructorRParen :
840 /// CheckAllocatedType - Checks that a type is suitable as the allocated type
841 /// in a new-expression.
842 /// dimension off and stores the size expression in ArraySize.
843 bool Sema::CheckAllocatedType(QualType AllocType, SourceLocation Loc,
845 // C++ 5.3.4p1: "[The] type shall be a complete object type, but not an
846 // abstract class type or array thereof.
847 if (AllocType->isFunctionType())
848 return Diag(Loc, diag::err_bad_new_type)
849 << AllocType << 0 << R;
850 else if (AllocType->isReferenceType())
851 return Diag(Loc, diag::err_bad_new_type)
852 << AllocType << 1 << R;
853 else if (!AllocType->isDependentType() &&
854 RequireCompleteType(Loc, AllocType,
855 PDiag(diag::err_new_incomplete_type)
858 else if (RequireNonAbstractType(Loc, AllocType,
859 diag::err_allocation_of_abstract_type))
865 /// \brief Determine whether the given function is a non-placement
866 /// deallocation function.
867 static bool isNonPlacementDeallocationFunction(FunctionDecl *FD) {
868 if (FD->isInvalidDecl())
871 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD))
872 return Method->isUsualDeallocationFunction();
874 return ((FD->getOverloadedOperator() == OO_Delete ||
875 FD->getOverloadedOperator() == OO_Array_Delete) &&
876 FD->getNumParams() == 1);
879 /// FindAllocationFunctions - Finds the overloads of operator new and delete
880 /// that are appropriate for the allocation.
881 bool Sema::FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
882 bool UseGlobal, QualType AllocType,
883 bool IsArray, Expr **PlaceArgs,
884 unsigned NumPlaceArgs,
885 FunctionDecl *&OperatorNew,
886 FunctionDecl *&OperatorDelete) {
887 // --- Choosing an allocation function ---
888 // C++ 5.3.4p8 - 14 & 18
889 // 1) If UseGlobal is true, only look in the global scope. Else, also look
890 // in the scope of the allocated class.
891 // 2) If an array size is given, look for operator new[], else look for
893 // 3) The first argument is always size_t. Append the arguments from the
896 llvm::SmallVector<Expr*, 8> AllocArgs(1 + NumPlaceArgs);
897 // We don't care about the actual value of this argument.
898 // FIXME: Should the Sema create the expression and embed it in the syntax
899 // tree? Or should the consumer just recalculate the value?
900 IntegerLiteral Size(llvm::APInt::getNullValue(
901 Context.Target.getPointerWidth(0)),
902 Context.getSizeType(),
904 AllocArgs[0] = &Size;
905 std::copy(PlaceArgs, PlaceArgs + NumPlaceArgs, AllocArgs.begin() + 1);
908 // If the allocated type is a non-array type, the allocation
909 // function’s name is operator new and the deallocation function’s
910 // name is operator delete. If the allocated type is an array
911 // type, the allocation function’s name is operator new[] and the
912 // deallocation function’s name is operator delete[].
913 DeclarationName NewName = Context.DeclarationNames.getCXXOperatorName(
914 IsArray ? OO_Array_New : OO_New);
915 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
916 IsArray ? OO_Array_Delete : OO_Delete);
918 if (AllocType->isRecordType() && !UseGlobal) {
919 CXXRecordDecl *Record
920 = cast<CXXRecordDecl>(AllocType->getAs<RecordType>()->getDecl());
921 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0],
922 AllocArgs.size(), Record, /*AllowMissing=*/true,
927 // Didn't find a member overload. Look for a global one.
928 DeclareGlobalNewDelete();
929 DeclContext *TUDecl = Context.getTranslationUnitDecl();
930 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0],
931 AllocArgs.size(), TUDecl, /*AllowMissing=*/false,
936 // We don't need an operator delete if we're running under
938 if (!getLangOptions().Exceptions) {
943 // FindAllocationOverload can change the passed in arguments, so we need to
945 if (NumPlaceArgs > 0)
946 std::copy(&AllocArgs[1], AllocArgs.end(), PlaceArgs);
948 // C++ [expr.new]p19:
950 // If the new-expression begins with a unary :: operator, the
951 // deallocation function’s name is looked up in the global
952 // scope. Otherwise, if the allocated type is a class type T or an
953 // array thereof, the deallocation function’s name is looked up in
954 // the scope of T. If this lookup fails to find the name, or if
955 // the allocated type is not a class type or array thereof, the
956 // deallocation function’s name is looked up in the global scope.
957 LookupResult FoundDelete(*this, DeleteName, StartLoc, LookupOrdinaryName);
958 if (AllocType->isRecordType() && !UseGlobal) {
960 = cast<CXXRecordDecl>(AllocType->getAs<RecordType>()->getDecl());
961 LookupQualifiedName(FoundDelete, RD);
963 if (FoundDelete.isAmbiguous())
964 return true; // FIXME: clean up expressions?
966 if (FoundDelete.empty()) {
967 DeclareGlobalNewDelete();
968 LookupQualifiedName(FoundDelete, Context.getTranslationUnitDecl());
971 FoundDelete.suppressDiagnostics();
973 llvm::SmallVector<std::pair<DeclAccessPair,FunctionDecl*>, 2> Matches;
975 if (NumPlaceArgs > 0) {
976 // C++ [expr.new]p20:
977 // A declaration of a placement deallocation function matches the
978 // declaration of a placement allocation function if it has the
979 // same number of parameters and, after parameter transformations
980 // (8.3.5), all parameter types except the first are
983 // To perform this comparison, we compute the function type that
984 // the deallocation function should have, and use that type both
985 // for template argument deduction and for comparison purposes.
986 QualType ExpectedFunctionType;
988 const FunctionProtoType *Proto
989 = OperatorNew->getType()->getAs<FunctionProtoType>();
990 llvm::SmallVector<QualType, 4> ArgTypes;
991 ArgTypes.push_back(Context.VoidPtrTy);
992 for (unsigned I = 1, N = Proto->getNumArgs(); I < N; ++I)
993 ArgTypes.push_back(Proto->getArgType(I));
996 = Context.getFunctionType(Context.VoidTy, ArgTypes.data(),
999 0, false, false, 0, 0,
1000 FunctionType::ExtInfo());
1003 for (LookupResult::iterator D = FoundDelete.begin(),
1004 DEnd = FoundDelete.end();
1006 FunctionDecl *Fn = 0;
1007 if (FunctionTemplateDecl *FnTmpl
1008 = dyn_cast<FunctionTemplateDecl>((*D)->getUnderlyingDecl())) {
1009 // Perform template argument deduction to try to match the
1010 // expected function type.
1011 TemplateDeductionInfo Info(Context, StartLoc);
1012 if (DeduceTemplateArguments(FnTmpl, 0, ExpectedFunctionType, Fn, Info))
1015 Fn = cast<FunctionDecl>((*D)->getUnderlyingDecl());
1017 if (Context.hasSameType(Fn->getType(), ExpectedFunctionType))
1018 Matches.push_back(std::make_pair(D.getPair(), Fn));
1021 // C++ [expr.new]p20:
1022 // [...] Any non-placement deallocation function matches a
1023 // non-placement allocation function. [...]
1024 for (LookupResult::iterator D = FoundDelete.begin(),
1025 DEnd = FoundDelete.end();
1027 if (FunctionDecl *Fn = dyn_cast<FunctionDecl>((*D)->getUnderlyingDecl()))
1028 if (isNonPlacementDeallocationFunction(Fn))
1029 Matches.push_back(std::make_pair(D.getPair(), Fn));
1033 // C++ [expr.new]p20:
1034 // [...] If the lookup finds a single matching deallocation
1035 // function, that function will be called; otherwise, no
1036 // deallocation function will be called.
1037 if (Matches.size() == 1) {
1038 OperatorDelete = Matches[0].second;
1040 // C++0x [expr.new]p20:
1041 // If the lookup finds the two-parameter form of a usual
1042 // deallocation function (3.7.4.2) and that function, considered
1043 // as a placement deallocation function, would have been
1044 // selected as a match for the allocation function, the program
1046 if (NumPlaceArgs && getLangOptions().CPlusPlus0x &&
1047 isNonPlacementDeallocationFunction(OperatorDelete)) {
1048 Diag(StartLoc, diag::err_placement_new_non_placement_delete)
1049 << SourceRange(PlaceArgs[0]->getLocStart(),
1050 PlaceArgs[NumPlaceArgs - 1]->getLocEnd());
1051 Diag(OperatorDelete->getLocation(), diag::note_previous_decl)
1054 CheckAllocationAccess(StartLoc, Range, FoundDelete.getNamingClass(),
1062 /// FindAllocationOverload - Find an fitting overload for the allocation
1063 /// function in the specified scope.
1064 bool Sema::FindAllocationOverload(SourceLocation StartLoc, SourceRange Range,
1065 DeclarationName Name, Expr** Args,
1066 unsigned NumArgs, DeclContext *Ctx,
1067 bool AllowMissing, FunctionDecl *&Operator) {
1068 LookupResult R(*this, Name, StartLoc, LookupOrdinaryName);
1069 LookupQualifiedName(R, Ctx);
1073 return Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
1077 if (R.isAmbiguous())
1080 R.suppressDiagnostics();
1082 OverloadCandidateSet Candidates(StartLoc);
1083 for (LookupResult::iterator Alloc = R.begin(), AllocEnd = R.end();
1084 Alloc != AllocEnd; ++Alloc) {
1085 // Even member operator new/delete are implicitly treated as
1086 // static, so don't use AddMemberCandidate.
1087 NamedDecl *D = (*Alloc)->getUnderlyingDecl();
1089 if (FunctionTemplateDecl *FnTemplate = dyn_cast<FunctionTemplateDecl>(D)) {
1090 AddTemplateOverloadCandidate(FnTemplate, Alloc.getPair(),
1091 /*ExplicitTemplateArgs=*/0, Args, NumArgs,
1093 /*SuppressUserConversions=*/false);
1097 FunctionDecl *Fn = cast<FunctionDecl>(D);
1098 AddOverloadCandidate(Fn, Alloc.getPair(), Args, NumArgs, Candidates,
1099 /*SuppressUserConversions=*/false);
1102 // Do the resolution.
1103 OverloadCandidateSet::iterator Best;
1104 switch(BestViableFunction(Candidates, StartLoc, Best)) {
1107 FunctionDecl *FnDecl = Best->Function;
1108 // The first argument is size_t, and the first parameter must be size_t,
1109 // too. This is checked on declaration and can be assumed. (It can't be
1110 // asserted on, though, since invalid decls are left in there.)
1111 // Watch out for variadic allocator function.
1112 unsigned NumArgsInFnDecl = FnDecl->getNumParams();
1113 for (unsigned i = 0; (i < NumArgs && i < NumArgsInFnDecl); ++i) {
1114 OwningExprResult Result
1115 = PerformCopyInitialization(InitializedEntity::InitializeParameter(
1116 FnDecl->getParamDecl(i)),
1118 Owned(Args[i]->Retain()));
1119 if (Result.isInvalid())
1122 Args[i] = Result.takeAs<Expr>();
1125 CheckAllocationAccess(StartLoc, Range, R.getNamingClass(), Best->FoundDecl);
1129 case OR_No_Viable_Function:
1130 Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
1132 PrintOverloadCandidates(Candidates, OCD_AllCandidates, Args, NumArgs);
1136 Diag(StartLoc, diag::err_ovl_ambiguous_call)
1138 PrintOverloadCandidates(Candidates, OCD_ViableCandidates, Args, NumArgs);
1142 Diag(StartLoc, diag::err_ovl_deleted_call)
1143 << Best->Function->isDeleted()
1145 PrintOverloadCandidates(Candidates, OCD_AllCandidates, Args, NumArgs);
1148 assert(false && "Unreachable, bad result from BestViableFunction");
1153 /// DeclareGlobalNewDelete - Declare the global forms of operator new and
1154 /// delete. These are:
1156 /// void* operator new(std::size_t) throw(std::bad_alloc);
1157 /// void* operator new[](std::size_t) throw(std::bad_alloc);
1158 /// void operator delete(void *) throw();
1159 /// void operator delete[](void *) throw();
1161 /// Note that the placement and nothrow forms of new are *not* implicitly
1162 /// declared. Their use requires including \<new\>.
1163 void Sema::DeclareGlobalNewDelete() {
1164 if (GlobalNewDeleteDeclared)
1167 // C++ [basic.std.dynamic]p2:
1168 // [...] The following allocation and deallocation functions (18.4) are
1169 // implicitly declared in global scope in each translation unit of a
1172 // void* operator new(std::size_t) throw(std::bad_alloc);
1173 // void* operator new[](std::size_t) throw(std::bad_alloc);
1174 // void operator delete(void*) throw();
1175 // void operator delete[](void*) throw();
1177 // These implicit declarations introduce only the function names operator
1178 // new, operator new[], operator delete, operator delete[].
1180 // Here, we need to refer to std::bad_alloc, so we will implicitly declare
1181 // "std" or "bad_alloc" as necessary to form the exception specification.
1182 // However, we do not make these implicit declarations visible to name
1184 if (!StdNamespace) {
1185 // The "std" namespace has not yet been defined, so build one implicitly.
1186 StdNamespace = NamespaceDecl::Create(Context,
1187 Context.getTranslationUnitDecl(),
1189 &PP.getIdentifierTable().get("std"));
1190 StdNamespace->setImplicit(true);
1194 // The "std::bad_alloc" class has not yet been declared, so build it
1196 StdBadAlloc = CXXRecordDecl::Create(Context, TTK_Class,
1199 &PP.getIdentifierTable().get("bad_alloc"),
1200 SourceLocation(), 0);
1201 StdBadAlloc->setImplicit(true);
1204 GlobalNewDeleteDeclared = true;
1206 QualType VoidPtr = Context.getPointerType(Context.VoidTy);
1207 QualType SizeT = Context.getSizeType();
1208 bool AssumeSaneOperatorNew = getLangOptions().AssumeSaneOperatorNew;
1210 DeclareGlobalAllocationFunction(
1211 Context.DeclarationNames.getCXXOperatorName(OO_New),
1212 VoidPtr, SizeT, AssumeSaneOperatorNew);
1213 DeclareGlobalAllocationFunction(
1214 Context.DeclarationNames.getCXXOperatorName(OO_Array_New),
1215 VoidPtr, SizeT, AssumeSaneOperatorNew);
1216 DeclareGlobalAllocationFunction(
1217 Context.DeclarationNames.getCXXOperatorName(OO_Delete),
1218 Context.VoidTy, VoidPtr);
1219 DeclareGlobalAllocationFunction(
1220 Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete),
1221 Context.VoidTy, VoidPtr);
1224 /// DeclareGlobalAllocationFunction - Declares a single implicit global
1225 /// allocation function if it doesn't already exist.
1226 void Sema::DeclareGlobalAllocationFunction(DeclarationName Name,
1227 QualType Return, QualType Argument,
1228 bool AddMallocAttr) {
1229 DeclContext *GlobalCtx = Context.getTranslationUnitDecl();
1231 // Check if this function is already declared.
1233 DeclContext::lookup_iterator Alloc, AllocEnd;
1234 for (llvm::tie(Alloc, AllocEnd) = GlobalCtx->lookup(Name);
1235 Alloc != AllocEnd; ++Alloc) {
1236 // Only look at non-template functions, as it is the predefined,
1237 // non-templated allocation function we are trying to declare here.
1238 if (FunctionDecl *Func = dyn_cast<FunctionDecl>(*Alloc)) {
1239 QualType InitialParamType =
1240 Context.getCanonicalType(
1241 Func->getParamDecl(0)->getType().getUnqualifiedType());
1242 // FIXME: Do we need to check for default arguments here?
1243 if (Func->getNumParams() == 1 && InitialParamType == Argument)
1249 QualType BadAllocType;
1250 bool HasBadAllocExceptionSpec
1251 = (Name.getCXXOverloadedOperator() == OO_New ||
1252 Name.getCXXOverloadedOperator() == OO_Array_New);
1253 if (HasBadAllocExceptionSpec) {
1254 assert(StdBadAlloc && "Must have std::bad_alloc declared");
1255 BadAllocType = Context.getTypeDeclType(StdBadAlloc);
1258 QualType FnType = Context.getFunctionType(Return, &Argument, 1, false, 0,
1260 HasBadAllocExceptionSpec? 1 : 0,
1262 FunctionType::ExtInfo());
1263 FunctionDecl *Alloc =
1264 FunctionDecl::Create(Context, GlobalCtx, SourceLocation(), Name,
1265 FnType, /*TInfo=*/0, FunctionDecl::None,
1266 FunctionDecl::None, false, true);
1267 Alloc->setImplicit();
1270 Alloc->addAttr(::new (Context) MallocAttr());
1272 ParmVarDecl *Param = ParmVarDecl::Create(Context, Alloc, SourceLocation(),
1273 0, Argument, /*TInfo=*/0,
1276 Alloc->setParams(&Param, 1);
1278 // FIXME: Also add this declaration to the IdentifierResolver, but
1279 // make sure it is at the end of the chain to coincide with the
1281 ((DeclContext *)TUScope->getEntity())->addDecl(Alloc);
1284 bool Sema::FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD,
1285 DeclarationName Name,
1286 FunctionDecl* &Operator) {
1287 LookupResult Found(*this, Name, StartLoc, LookupOrdinaryName);
1288 // Try to find operator delete/operator delete[] in class scope.
1289 LookupQualifiedName(Found, RD);
1291 if (Found.isAmbiguous())
1294 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end();
1296 if (CXXMethodDecl *Delete = dyn_cast<CXXMethodDecl>(*F))
1297 if (Delete->isUsualDeallocationFunction()) {
1303 // We did find operator delete/operator delete[] declarations, but
1304 // none of them were suitable.
1305 if (!Found.empty()) {
1306 Diag(StartLoc, diag::err_no_suitable_delete_member_function_found)
1309 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end();
1311 Diag((*F)->getLocation(), diag::note_member_declared_here)
1318 // Look for a global declaration.
1319 DeclareGlobalNewDelete();
1320 DeclContext *TUDecl = Context.getTranslationUnitDecl();
1322 CXXNullPtrLiteralExpr Null(Context.VoidPtrTy, SourceLocation());
1323 Expr* DeallocArgs[1];
1324 DeallocArgs[0] = &Null;
1325 if (FindAllocationOverload(StartLoc, SourceRange(), Name,
1326 DeallocArgs, 1, TUDecl, /*AllowMissing=*/false,
1330 assert(Operator && "Did not find a deallocation function!");
1334 /// ActOnCXXDelete - Parsed a C++ 'delete' expression (C++ 5.3.5), as in:
1335 /// @code ::delete ptr; @endcode
1337 /// @code delete [] ptr; @endcode
1338 Action::OwningExprResult
1339 Sema::ActOnCXXDelete(SourceLocation StartLoc, bool UseGlobal,
1340 bool ArrayForm, ExprArg Operand) {
1341 // C++ [expr.delete]p1:
1342 // The operand shall have a pointer type, or a class type having a single
1343 // conversion function to a pointer type. The result has type void.
1345 // DR599 amends "pointer type" to "pointer to object type" in both cases.
1347 FunctionDecl *OperatorDelete = 0;
1349 Expr *Ex = (Expr *)Operand.get();
1350 if (!Ex->isTypeDependent()) {
1351 QualType Type = Ex->getType();
1353 if (const RecordType *Record = Type->getAs<RecordType>()) {
1354 llvm::SmallVector<CXXConversionDecl*, 4> ObjectPtrConversions;
1356 CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
1357 const UnresolvedSetImpl *Conversions = RD->getVisibleConversionFunctions();
1358 for (UnresolvedSetImpl::iterator I = Conversions->begin(),
1359 E = Conversions->end(); I != E; ++I) {
1360 NamedDecl *D = I.getDecl();
1361 if (isa<UsingShadowDecl>(D))
1362 D = cast<UsingShadowDecl>(D)->getTargetDecl();
1364 // Skip over templated conversion functions; they aren't considered.
1365 if (isa<FunctionTemplateDecl>(D))
1368 CXXConversionDecl *Conv = cast<CXXConversionDecl>(D);
1370 QualType ConvType = Conv->getConversionType().getNonReferenceType();
1371 if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>())
1372 if (ConvPtrType->getPointeeType()->isObjectType())
1373 ObjectPtrConversions.push_back(Conv);
1375 if (ObjectPtrConversions.size() == 1) {
1376 // We have a single conversion to a pointer-to-object type. Perform
1378 // TODO: don't redo the conversion calculation.
1380 if (!PerformImplicitConversion(Ex,
1381 ObjectPtrConversions.front()->getConversionType(),
1383 Operand = Owned(Ex);
1384 Type = Ex->getType();
1387 else if (ObjectPtrConversions.size() > 1) {
1388 Diag(StartLoc, diag::err_ambiguous_delete_operand)
1389 << Type << Ex->getSourceRange();
1390 for (unsigned i= 0; i < ObjectPtrConversions.size(); i++)
1391 NoteOverloadCandidate(ObjectPtrConversions[i]);
1396 if (!Type->isPointerType())
1397 return ExprError(Diag(StartLoc, diag::err_delete_operand)
1398 << Type << Ex->getSourceRange());
1400 QualType Pointee = Type->getAs<PointerType>()->getPointeeType();
1401 if (Pointee->isVoidType() && !isSFINAEContext()) {
1402 // The C++ standard bans deleting a pointer to a non-object type, which
1403 // effectively bans deletion of "void*". However, most compilers support
1404 // this, so we treat it as a warning unless we're in a SFINAE context.
1405 Diag(StartLoc, diag::ext_delete_void_ptr_operand)
1406 << Type << Ex->getSourceRange();
1407 } else if (Pointee->isFunctionType() || Pointee->isVoidType())
1408 return ExprError(Diag(StartLoc, diag::err_delete_operand)
1409 << Type << Ex->getSourceRange());
1410 else if (!Pointee->isDependentType() &&
1411 RequireCompleteType(StartLoc, Pointee,
1412 PDiag(diag::warn_delete_incomplete)
1413 << Ex->getSourceRange()))
1416 // C++ [expr.delete]p2:
1417 // [Note: a pointer to a const type can be the operand of a
1418 // delete-expression; it is not necessary to cast away the constness
1419 // (5.2.11) of the pointer expression before it is used as the operand
1420 // of the delete-expression. ]
1421 ImpCastExprToType(Ex, Context.getPointerType(Context.VoidTy),
1424 // Update the operand.
1426 Operand = ExprArg(*this, Ex);
1428 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
1429 ArrayForm ? OO_Array_Delete : OO_Delete);
1431 if (const RecordType *RT = Pointee->getAs<RecordType>()) {
1432 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
1435 FindDeallocationFunction(StartLoc, RD, DeleteName, OperatorDelete))
1438 if (!RD->hasTrivialDestructor())
1439 if (const CXXDestructorDecl *Dtor = RD->getDestructor(Context))
1440 MarkDeclarationReferenced(StartLoc,
1441 const_cast<CXXDestructorDecl*>(Dtor));
1444 if (!OperatorDelete) {
1445 // Look for a global declaration.
1446 DeclareGlobalNewDelete();
1447 DeclContext *TUDecl = Context.getTranslationUnitDecl();
1448 if (FindAllocationOverload(StartLoc, SourceRange(), DeleteName,
1449 &Ex, 1, TUDecl, /*AllowMissing=*/false,
1454 MarkDeclarationReferenced(StartLoc, OperatorDelete);
1456 // FIXME: Check access and ambiguity of operator delete and destructor.
1460 return Owned(new (Context) CXXDeleteExpr(Context.VoidTy, UseGlobal, ArrayForm,
1461 OperatorDelete, Ex, StartLoc));
1464 /// \brief Check the use of the given variable as a C++ condition in an if,
1465 /// while, do-while, or switch statement.
1466 Action::OwningExprResult Sema::CheckConditionVariable(VarDecl *ConditionVar,
1467 SourceLocation StmtLoc,
1468 bool ConvertToBoolean) {
1469 QualType T = ConditionVar->getType();
1471 // C++ [stmt.select]p2:
1472 // The declarator shall not specify a function or an array.
1473 if (T->isFunctionType())
1474 return ExprError(Diag(ConditionVar->getLocation(),
1475 diag::err_invalid_use_of_function_type)
1476 << ConditionVar->getSourceRange());
1477 else if (T->isArrayType())
1478 return ExprError(Diag(ConditionVar->getLocation(),
1479 diag::err_invalid_use_of_array_type)
1480 << ConditionVar->getSourceRange());
1482 Expr *Condition = DeclRefExpr::Create(Context, 0, SourceRange(), ConditionVar,
1483 ConditionVar->getLocation(),
1484 ConditionVar->getType().getNonReferenceType());
1485 if (ConvertToBoolean && CheckBooleanCondition(Condition, StmtLoc)) {
1486 Condition->Destroy(Context);
1490 return Owned(Condition);
1493 /// CheckCXXBooleanCondition - Returns true if a conversion to bool is invalid.
1494 bool Sema::CheckCXXBooleanCondition(Expr *&CondExpr) {
1496 // The value of a condition that is an initialized declaration in a statement
1497 // other than a switch statement is the value of the declared variable
1498 // implicitly converted to type bool. If that conversion is ill-formed, the
1499 // program is ill-formed.
1500 // The value of a condition that is an expression is the value of the
1501 // expression, implicitly converted to bool.
1503 return PerformContextuallyConvertToBool(CondExpr);
1506 /// Helper function to determine whether this is the (deprecated) C++
1507 /// conversion from a string literal to a pointer to non-const char or
1508 /// non-const wchar_t (for narrow and wide string literals,
1511 Sema::IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType) {
1512 // Look inside the implicit cast, if it exists.
1513 if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(From))
1514 From = Cast->getSubExpr();
1516 // A string literal (2.13.4) that is not a wide string literal can
1517 // be converted to an rvalue of type "pointer to char"; a wide
1518 // string literal can be converted to an rvalue of type "pointer
1519 // to wchar_t" (C++ 4.2p2).
1520 if (StringLiteral *StrLit = dyn_cast<StringLiteral>(From))
1521 if (const PointerType *ToPtrType = ToType->getAs<PointerType>())
1522 if (const BuiltinType *ToPointeeType
1523 = ToPtrType->getPointeeType()->getAs<BuiltinType>()) {
1524 // This conversion is considered only when there is an
1525 // explicit appropriate pointer target type (C++ 4.2p2).
1526 if (!ToPtrType->getPointeeType().hasQualifiers() &&
1527 ((StrLit->isWide() && ToPointeeType->isWideCharType()) ||
1528 (!StrLit->isWide() &&
1529 (ToPointeeType->getKind() == BuiltinType::Char_U ||
1530 ToPointeeType->getKind() == BuiltinType::Char_S))))
1537 static Sema::OwningExprResult BuildCXXCastArgument(Sema &S,
1538 SourceLocation CastLoc,
1540 CastExpr::CastKind Kind,
1541 CXXMethodDecl *Method,
1542 Sema::ExprArg Arg) {
1543 Expr *From = Arg.takeAs<Expr>();
1546 default: assert(0 && "Unhandled cast kind!");
1547 case CastExpr::CK_ConstructorConversion: {
1548 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(S);
1550 if (S.CompleteConstructorCall(cast<CXXConstructorDecl>(Method),
1551 Sema::MultiExprArg(S, (void **)&From, 1),
1552 CastLoc, ConstructorArgs))
1553 return S.ExprError();
1555 Sema::OwningExprResult Result =
1556 S.BuildCXXConstructExpr(CastLoc, Ty, cast<CXXConstructorDecl>(Method),
1557 move_arg(ConstructorArgs));
1558 if (Result.isInvalid())
1559 return S.ExprError();
1561 return S.MaybeBindToTemporary(Result.takeAs<Expr>());
1564 case CastExpr::CK_UserDefinedConversion: {
1565 assert(!From->getType()->isPointerType() && "Arg can't have pointer type!");
1567 // Create an implicit call expr that calls it.
1568 // FIXME: pass the FoundDecl for the user-defined conversion here
1569 CXXMemberCallExpr *CE = S.BuildCXXMemberCallExpr(From, Method, Method);
1570 return S.MaybeBindToTemporary(CE);
1575 /// PerformImplicitConversion - Perform an implicit conversion of the
1576 /// expression From to the type ToType using the pre-computed implicit
1577 /// conversion sequence ICS. Returns true if there was an error, false
1578 /// otherwise. The expression From is replaced with the converted
1579 /// expression. Action is the kind of conversion we're performing,
1580 /// used in the error message.
1582 Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
1583 const ImplicitConversionSequence &ICS,
1584 AssignmentAction Action, bool IgnoreBaseAccess) {
1585 switch (ICS.getKind()) {
1586 case ImplicitConversionSequence::StandardConversion:
1587 if (PerformImplicitConversion(From, ToType, ICS.Standard, Action,
1592 case ImplicitConversionSequence::UserDefinedConversion: {
1594 FunctionDecl *FD = ICS.UserDefined.ConversionFunction;
1595 CastExpr::CastKind CastKind = CastExpr::CK_Unknown;
1596 QualType BeforeToType;
1597 if (const CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(FD)) {
1598 CastKind = CastExpr::CK_UserDefinedConversion;
1600 // If the user-defined conversion is specified by a conversion function,
1601 // the initial standard conversion sequence converts the source type to
1602 // the implicit object parameter of the conversion function.
1603 BeforeToType = Context.getTagDeclType(Conv->getParent());
1604 } else if (const CXXConstructorDecl *Ctor =
1605 dyn_cast<CXXConstructorDecl>(FD)) {
1606 CastKind = CastExpr::CK_ConstructorConversion;
1607 // Do no conversion if dealing with ... for the first conversion.
1608 if (!ICS.UserDefined.EllipsisConversion) {
1609 // If the user-defined conversion is specified by a constructor, the
1610 // initial standard conversion sequence converts the source type to the
1611 // type required by the argument of the constructor
1612 BeforeToType = Ctor->getParamDecl(0)->getType().getNonReferenceType();
1616 assert(0 && "Unknown conversion function kind!");
1617 // Whatch out for elipsis conversion.
1618 if (!ICS.UserDefined.EllipsisConversion) {
1619 if (PerformImplicitConversion(From, BeforeToType,
1620 ICS.UserDefined.Before, AA_Converting,
1625 OwningExprResult CastArg
1626 = BuildCXXCastArgument(*this,
1627 From->getLocStart(),
1628 ToType.getNonReferenceType(),
1629 CastKind, cast<CXXMethodDecl>(FD),
1632 if (CastArg.isInvalid())
1635 From = CastArg.takeAs<Expr>();
1637 return PerformImplicitConversion(From, ToType, ICS.UserDefined.After,
1638 AA_Converting, IgnoreBaseAccess);
1641 case ImplicitConversionSequence::AmbiguousConversion:
1642 DiagnoseAmbiguousConversion(ICS, From->getExprLoc(),
1643 PDiag(diag::err_typecheck_ambiguous_condition)
1644 << From->getSourceRange());
1647 case ImplicitConversionSequence::EllipsisConversion:
1648 assert(false && "Cannot perform an ellipsis conversion");
1651 case ImplicitConversionSequence::BadConversion:
1655 // Everything went well.
1659 /// PerformImplicitConversion - Perform an implicit conversion of the
1660 /// expression From to the type ToType by following the standard
1661 /// conversion sequence SCS. Returns true if there was an error, false
1662 /// otherwise. The expression From is replaced with the converted
1663 /// expression. Flavor is the context in which we're performing this
1664 /// conversion, for use in error messages.
1666 Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
1667 const StandardConversionSequence& SCS,
1668 AssignmentAction Action, bool IgnoreBaseAccess) {
1669 // Overall FIXME: we are recomputing too many types here and doing far too
1670 // much extra work. What this means is that we need to keep track of more
1671 // information that is computed when we try the implicit conversion initially,
1672 // so that we don't need to recompute anything here.
1673 QualType FromType = From->getType();
1675 if (SCS.CopyConstructor) {
1676 // FIXME: When can ToType be a reference type?
1677 assert(!ToType->isReferenceType());
1678 if (SCS.Second == ICK_Derived_To_Base) {
1679 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
1680 if (CompleteConstructorCall(cast<CXXConstructorDecl>(SCS.CopyConstructor),
1681 MultiExprArg(*this, (void **)&From, 1),
1682 /*FIXME:ConstructLoc*/SourceLocation(),
1685 OwningExprResult FromResult =
1686 BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(),
1687 ToType, SCS.CopyConstructor,
1688 move_arg(ConstructorArgs));
1689 if (FromResult.isInvalid())
1691 From = FromResult.takeAs<Expr>();
1694 OwningExprResult FromResult =
1695 BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(),
1696 ToType, SCS.CopyConstructor,
1697 MultiExprArg(*this, (void**)&From, 1));
1699 if (FromResult.isInvalid())
1702 From = FromResult.takeAs<Expr>();
1706 // Resolve overloaded function references.
1707 if (Context.hasSameType(FromType, Context.OverloadTy)) {
1708 DeclAccessPair Found;
1709 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(From, ToType,
1714 if (DiagnoseUseOfDecl(Fn, From->getSourceRange().getBegin()))
1717 From = FixOverloadedFunctionReference(From, Found, Fn);
1718 FromType = From->getType();
1721 // Perform the first implicit conversion.
1722 switch (SCS.First) {
1724 case ICK_Lvalue_To_Rvalue:
1728 case ICK_Array_To_Pointer:
1729 FromType = Context.getArrayDecayedType(FromType);
1730 ImpCastExprToType(From, FromType, CastExpr::CK_ArrayToPointerDecay);
1733 case ICK_Function_To_Pointer:
1734 FromType = Context.getPointerType(FromType);
1735 ImpCastExprToType(From, FromType, CastExpr::CK_FunctionToPointerDecay);
1739 assert(false && "Improper first standard conversion");
1743 // Perform the second implicit conversion
1744 switch (SCS.Second) {
1746 // If both sides are functions (or pointers/references to them), there could
1747 // be incompatible exception declarations.
1748 if (CheckExceptionSpecCompatibility(From, ToType))
1750 // Nothing else to do.
1753 case ICK_NoReturn_Adjustment:
1754 // If both sides are functions (or pointers/references to them), there could
1755 // be incompatible exception declarations.
1756 if (CheckExceptionSpecCompatibility(From, ToType))
1759 ImpCastExprToType(From, Context.getNoReturnType(From->getType(), false),
1763 case ICK_Integral_Promotion:
1764 case ICK_Integral_Conversion:
1765 ImpCastExprToType(From, ToType, CastExpr::CK_IntegralCast);
1768 case ICK_Floating_Promotion:
1769 case ICK_Floating_Conversion:
1770 ImpCastExprToType(From, ToType, CastExpr::CK_FloatingCast);
1773 case ICK_Complex_Promotion:
1774 case ICK_Complex_Conversion:
1775 ImpCastExprToType(From, ToType, CastExpr::CK_Unknown);
1778 case ICK_Floating_Integral:
1779 if (ToType->isFloatingType())
1780 ImpCastExprToType(From, ToType, CastExpr::CK_IntegralToFloating);
1782 ImpCastExprToType(From, ToType, CastExpr::CK_FloatingToIntegral);
1785 case ICK_Compatible_Conversion:
1786 ImpCastExprToType(From, ToType, CastExpr::CK_NoOp);
1789 case ICK_Pointer_Conversion: {
1790 if (SCS.IncompatibleObjC) {
1791 // Diagnose incompatible Objective-C conversions
1792 Diag(From->getSourceRange().getBegin(),
1793 diag::ext_typecheck_convert_incompatible_pointer)
1794 << From->getType() << ToType << Action
1795 << From->getSourceRange();
1799 CastExpr::CastKind Kind = CastExpr::CK_Unknown;
1800 CXXBaseSpecifierArray BasePath;
1801 if (CheckPointerConversion(From, ToType, Kind, BasePath, IgnoreBaseAccess))
1803 ImpCastExprToType(From, ToType, Kind, /*isLvalue=*/false, BasePath);
1807 case ICK_Pointer_Member: {
1808 CastExpr::CastKind Kind = CastExpr::CK_Unknown;
1809 CXXBaseSpecifierArray BasePath;
1810 if (CheckMemberPointerConversion(From, ToType, Kind, BasePath,
1813 if (CheckExceptionSpecCompatibility(From, ToType))
1815 ImpCastExprToType(From, ToType, Kind, /*isLvalue=*/false, BasePath);
1818 case ICK_Boolean_Conversion: {
1819 CastExpr::CastKind Kind = CastExpr::CK_Unknown;
1820 if (FromType->isMemberPointerType())
1821 Kind = CastExpr::CK_MemberPointerToBoolean;
1823 ImpCastExprToType(From, Context.BoolTy, Kind);
1827 case ICK_Derived_To_Base: {
1828 CXXBaseSpecifierArray BasePath;
1829 if (CheckDerivedToBaseConversion(From->getType(),
1830 ToType.getNonReferenceType(),
1831 From->getLocStart(),
1832 From->getSourceRange(),
1837 ImpCastExprToType(From, ToType.getNonReferenceType(),
1838 CastExpr::CK_DerivedToBase,
1839 /*isLvalue=*/(From->getType()->isRecordType() &&
1840 From->isLvalue(Context) == Expr::LV_Valid),
1845 case ICK_Vector_Conversion:
1846 ImpCastExprToType(From, ToType, CastExpr::CK_BitCast);
1849 case ICK_Vector_Splat:
1850 ImpCastExprToType(From, ToType, CastExpr::CK_VectorSplat);
1853 case ICK_Complex_Real:
1854 ImpCastExprToType(From, ToType, CastExpr::CK_Unknown);
1857 case ICK_Lvalue_To_Rvalue:
1858 case ICK_Array_To_Pointer:
1859 case ICK_Function_To_Pointer:
1860 case ICK_Qualification:
1861 case ICK_Num_Conversion_Kinds:
1862 assert(false && "Improper second standard conversion");
1866 switch (SCS.Third) {
1871 case ICK_Qualification:
1872 // FIXME: Not sure about lvalue vs rvalue here in the presence of rvalue
1874 ImpCastExprToType(From, ToType.getNonReferenceType(),
1875 CastExpr::CK_NoOp, ToType->isLValueReferenceType());
1877 if (SCS.DeprecatedStringLiteralToCharPtr)
1878 Diag(From->getLocStart(), diag::warn_deprecated_string_literal_conversion)
1879 << ToType.getNonReferenceType();
1884 assert(false && "Improper third standard conversion");
1891 Sema::OwningExprResult Sema::ActOnUnaryTypeTrait(UnaryTypeTrait OTT,
1892 SourceLocation KWLoc,
1893 SourceLocation LParen,
1895 SourceLocation RParen) {
1896 QualType T = GetTypeFromParser(Ty);
1898 // According to http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html
1899 // all traits except __is_class, __is_enum and __is_union require a the type
1901 if (OTT != UTT_IsClass && OTT != UTT_IsEnum && OTT != UTT_IsUnion) {
1902 if (RequireCompleteType(KWLoc, T,
1903 diag::err_incomplete_type_used_in_type_trait_expr))
1907 // There is no point in eagerly computing the value. The traits are designed
1908 // to be used from type trait templates, so Ty will be a template parameter
1910 return Owned(new (Context) UnaryTypeTraitExpr(KWLoc, OTT, T,
1911 RParen, Context.BoolTy));
1914 QualType Sema::CheckPointerToMemberOperands(
1915 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isIndirect) {
1916 const char *OpSpelling = isIndirect ? "->*" : ".*";
1918 // The binary operator .* [p3: ->*] binds its second operand, which shall
1919 // be of type "pointer to member of T" (where T is a completely-defined
1920 // class type) [...]
1921 QualType RType = rex->getType();
1922 const MemberPointerType *MemPtr = RType->getAs<MemberPointerType>();
1924 Diag(Loc, diag::err_bad_memptr_rhs)
1925 << OpSpelling << RType << rex->getSourceRange();
1929 QualType Class(MemPtr->getClass(), 0);
1931 if (RequireCompleteType(Loc, Class, diag::err_memptr_rhs_to_incomplete))
1935 // [...] to its first operand, which shall be of class T or of a class of
1936 // which T is an unambiguous and accessible base class. [p3: a pointer to
1938 QualType LType = lex->getType();
1940 if (const PointerType *Ptr = LType->getAs<PointerType>())
1941 LType = Ptr->getPointeeType().getNonReferenceType();
1943 Diag(Loc, diag::err_bad_memptr_lhs)
1944 << OpSpelling << 1 << LType
1945 << FixItHint::CreateReplacement(SourceRange(Loc), ".*");
1950 if (!Context.hasSameUnqualifiedType(Class, LType)) {
1951 // If we want to check the hierarchy, we need a complete type.
1952 if (RequireCompleteType(Loc, LType, PDiag(diag::err_bad_memptr_lhs)
1953 << OpSpelling << (int)isIndirect)) {
1956 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1957 /*DetectVirtual=*/false);
1958 // FIXME: Would it be useful to print full ambiguity paths, or is that
1960 if (!IsDerivedFrom(LType, Class, Paths) ||
1961 Paths.isAmbiguous(Context.getCanonicalType(Class))) {
1962 Diag(Loc, diag::err_bad_memptr_lhs) << OpSpelling
1963 << (int)isIndirect << lex->getType();
1966 // Cast LHS to type of use.
1967 QualType UseType = isIndirect ? Context.getPointerType(Class) : Class;
1968 bool isLValue = !isIndirect && lex->isLvalue(Context) == Expr::LV_Valid;
1970 CXXBaseSpecifierArray BasePath;
1971 BuildBasePathArray(Paths, BasePath);
1972 ImpCastExprToType(lex, UseType, CastExpr::CK_DerivedToBase, isLValue,
1976 if (isa<CXXZeroInitValueExpr>(rex->IgnoreParens())) {
1977 // Diagnose use of pointer-to-member type which when used as
1978 // the functional cast in a pointer-to-member expression.
1979 Diag(Loc, diag::err_pointer_to_member_type) << isIndirect;
1983 // The result is an object or a function of the type specified by the
1985 // The cv qualifiers are the union of those in the pointer and the left side,
1986 // in accordance with 5.5p5 and 5.2.5.
1987 // FIXME: This returns a dereferenced member function pointer as a normal
1988 // function type. However, the only operation valid on such functions is
1989 // calling them. There's also a GCC extension to get a function pointer to the
1990 // thing, which is another complication, because this type - unlike the type
1991 // that is the result of this expression - takes the class as the first
1993 // We probably need a "MemberFunctionClosureType" or something like that.
1994 QualType Result = MemPtr->getPointeeType();
1995 Result = Context.getCVRQualifiedType(Result, LType.getCVRQualifiers());
1999 /// \brief Try to convert a type to another according to C++0x 5.16p3.
2001 /// This is part of the parameter validation for the ? operator. If either
2002 /// value operand is a class type, the two operands are attempted to be
2003 /// converted to each other. This function does the conversion in one direction.
2004 /// It returns true if the program is ill-formed and has already been diagnosed
2006 static bool TryClassUnification(Sema &Self, Expr *From, Expr *To,
2007 SourceLocation QuestionLoc,
2008 bool &HaveConversion,
2010 HaveConversion = false;
2011 ToType = To->getType();
2013 InitializationKind Kind = InitializationKind::CreateCopy(To->getLocStart(),
2016 // The process for determining whether an operand expression E1 of type T1
2017 // can be converted to match an operand expression E2 of type T2 is defined
2019 // -- If E2 is an lvalue:
2020 bool ToIsLvalue = (To->isLvalue(Self.Context) == Expr::LV_Valid);
2022 // E1 can be converted to match E2 if E1 can be implicitly converted to
2023 // type "lvalue reference to T2", subject to the constraint that in the
2024 // conversion the reference must bind directly to E1.
2025 QualType T = Self.Context.getLValueReferenceType(ToType);
2026 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T);
2028 InitializationSequence InitSeq(Self, Entity, Kind, &From, 1);
2029 if (InitSeq.isDirectReferenceBinding()) {
2031 HaveConversion = true;
2035 if (InitSeq.isAmbiguous())
2036 return InitSeq.Diagnose(Self, Entity, Kind, &From, 1);
2039 // -- If E2 is an rvalue, or if the conversion above cannot be done:
2040 // -- if E1 and E2 have class type, and the underlying class types are
2041 // the same or one is a base class of the other:
2042 QualType FTy = From->getType();
2043 QualType TTy = To->getType();
2044 const RecordType *FRec = FTy->getAs<RecordType>();
2045 const RecordType *TRec = TTy->getAs<RecordType>();
2046 bool FDerivedFromT = FRec && TRec && FRec != TRec &&
2047 Self.IsDerivedFrom(FTy, TTy);
2049 (FRec == TRec || FDerivedFromT || Self.IsDerivedFrom(TTy, FTy))) {
2050 // E1 can be converted to match E2 if the class of T2 is the
2051 // same type as, or a base class of, the class of T1, and
2053 if (FRec == TRec || FDerivedFromT) {
2054 if (TTy.isAtLeastAsQualifiedAs(FTy)) {
2055 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy);
2056 InitializationSequence InitSeq(Self, Entity, Kind, &From, 1);
2057 if (InitSeq.getKind() != InitializationSequence::FailedSequence) {
2058 HaveConversion = true;
2062 if (InitSeq.isAmbiguous())
2063 return InitSeq.Diagnose(Self, Entity, Kind, &From, 1);
2070 // -- Otherwise: E1 can be converted to match E2 if E1 can be
2071 // implicitly converted to the type that expression E2 would have
2072 // if E2 were converted to an rvalue (or the type it has, if E2 is
2075 // This actually refers very narrowly to the lvalue-to-rvalue conversion, not
2076 // to the array-to-pointer or function-to-pointer conversions.
2077 if (!TTy->getAs<TagType>())
2078 TTy = TTy.getUnqualifiedType();
2080 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy);
2081 InitializationSequence InitSeq(Self, Entity, Kind, &From, 1);
2082 HaveConversion = InitSeq.getKind() != InitializationSequence::FailedSequence;
2084 if (InitSeq.isAmbiguous())
2085 return InitSeq.Diagnose(Self, Entity, Kind, &From, 1);
2090 /// \brief Try to find a common type for two according to C++0x 5.16p5.
2092 /// This is part of the parameter validation for the ? operator. If either
2093 /// value operand is a class type, overload resolution is used to find a
2094 /// conversion to a common type.
2095 static bool FindConditionalOverload(Sema &Self, Expr *&LHS, Expr *&RHS,
2096 SourceLocation Loc) {
2097 Expr *Args[2] = { LHS, RHS };
2098 OverloadCandidateSet CandidateSet(Loc);
2099 Self.AddBuiltinOperatorCandidates(OO_Conditional, Loc, Args, 2, CandidateSet);
2101 OverloadCandidateSet::iterator Best;
2102 switch (Self.BestViableFunction(CandidateSet, Loc, Best)) {
2104 // We found a match. Perform the conversions on the arguments and move on.
2105 if (Self.PerformImplicitConversion(LHS, Best->BuiltinTypes.ParamTypes[0],
2106 Best->Conversions[0], Sema::AA_Converting) ||
2107 Self.PerformImplicitConversion(RHS, Best->BuiltinTypes.ParamTypes[1],
2108 Best->Conversions[1], Sema::AA_Converting))
2112 case OR_No_Viable_Function:
2113 Self.Diag(Loc, diag::err_typecheck_cond_incompatible_operands)
2114 << LHS->getType() << RHS->getType()
2115 << LHS->getSourceRange() << RHS->getSourceRange();
2119 Self.Diag(Loc, diag::err_conditional_ambiguous_ovl)
2120 << LHS->getType() << RHS->getType()
2121 << LHS->getSourceRange() << RHS->getSourceRange();
2122 // FIXME: Print the possible common types by printing the return types of
2123 // the viable candidates.
2127 assert(false && "Conditional operator has only built-in overloads");
2133 /// \brief Perform an "extended" implicit conversion as returned by
2134 /// TryClassUnification.
2135 static bool ConvertForConditional(Sema &Self, Expr *&E, QualType T) {
2136 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T);
2137 InitializationKind Kind = InitializationKind::CreateCopy(E->getLocStart(),
2139 InitializationSequence InitSeq(Self, Entity, Kind, &E, 1);
2140 Sema::OwningExprResult Result = InitSeq.Perform(Self, Entity, Kind,
2141 Sema::MultiExprArg(Self, (void **)&E, 1));
2142 if (Result.isInvalid())
2145 E = Result.takeAs<Expr>();
2149 /// \brief Check the operands of ?: under C++ semantics.
2151 /// See C++ [expr.cond]. Note that LHS is never null, even for the GNU x ?: y
2152 /// extension. In this case, LHS == Cond. (But they're not aliases.)
2153 QualType Sema::CXXCheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS,
2154 SourceLocation QuestionLoc) {
2155 // FIXME: Handle C99's complex types, vector types, block pointers and Obj-C++
2156 // interface pointers.
2159 // The first expression is contextually converted to bool.
2160 if (!Cond->isTypeDependent()) {
2161 if (CheckCXXBooleanCondition(Cond))
2165 // Either of the arguments dependent?
2166 if (LHS->isTypeDependent() || RHS->isTypeDependent())
2167 return Context.DependentTy;
2170 // If either the second or the third operand has type (cv) void, ...
2171 QualType LTy = LHS->getType();
2172 QualType RTy = RHS->getType();
2173 bool LVoid = LTy->isVoidType();
2174 bool RVoid = RTy->isVoidType();
2175 if (LVoid || RVoid) {
2176 // ... then the [l2r] conversions are performed on the second and third
2178 DefaultFunctionArrayLvalueConversion(LHS);
2179 DefaultFunctionArrayLvalueConversion(RHS);
2180 LTy = LHS->getType();
2181 RTy = RHS->getType();
2183 // ... and one of the following shall hold:
2184 // -- The second or the third operand (but not both) is a throw-
2185 // expression; the result is of the type of the other and is an rvalue.
2186 bool LThrow = isa<CXXThrowExpr>(LHS);
2187 bool RThrow = isa<CXXThrowExpr>(RHS);
2188 if (LThrow && !RThrow)
2190 if (RThrow && !LThrow)
2193 // -- Both the second and third operands have type void; the result is of
2194 // type void and is an rvalue.
2196 return Context.VoidTy;
2198 // Neither holds, error.
2199 Diag(QuestionLoc, diag::err_conditional_void_nonvoid)
2200 << (LVoid ? RTy : LTy) << (LVoid ? 0 : 1)
2201 << LHS->getSourceRange() << RHS->getSourceRange();
2208 // Otherwise, if the second and third operand have different types, and
2209 // either has (cv) class type, and attempt is made to convert each of those
2210 // operands to the other.
2211 if (!Context.hasSameType(LTy, RTy) &&
2212 (LTy->isRecordType() || RTy->isRecordType())) {
2213 ImplicitConversionSequence ICSLeftToRight, ICSRightToLeft;
2214 // These return true if a single direction is already ambiguous.
2215 QualType L2RType, R2LType;
2216 bool HaveL2R, HaveR2L;
2217 if (TryClassUnification(*this, LHS, RHS, QuestionLoc, HaveL2R, L2RType))
2219 if (TryClassUnification(*this, RHS, LHS, QuestionLoc, HaveR2L, R2LType))
2222 // If both can be converted, [...] the program is ill-formed.
2223 if (HaveL2R && HaveR2L) {
2224 Diag(QuestionLoc, diag::err_conditional_ambiguous)
2225 << LTy << RTy << LHS->getSourceRange() << RHS->getSourceRange();
2229 // If exactly one conversion is possible, that conversion is applied to
2230 // the chosen operand and the converted operands are used in place of the
2231 // original operands for the remainder of this section.
2233 if (ConvertForConditional(*this, LHS, L2RType))
2235 LTy = LHS->getType();
2236 } else if (HaveR2L) {
2237 if (ConvertForConditional(*this, RHS, R2LType))
2239 RTy = RHS->getType();
2244 // If the second and third operands are lvalues and have the same type,
2245 // the result is of that type [...]
2246 bool Same = Context.hasSameType(LTy, RTy);
2247 if (Same && LHS->isLvalue(Context) == Expr::LV_Valid &&
2248 RHS->isLvalue(Context) == Expr::LV_Valid)
2252 // Otherwise, the result is an rvalue. If the second and third operands
2253 // do not have the same type, and either has (cv) class type, ...
2254 if (!Same && (LTy->isRecordType() || RTy->isRecordType())) {
2255 // ... overload resolution is used to determine the conversions (if any)
2256 // to be applied to the operands. If the overload resolution fails, the
2257 // program is ill-formed.
2258 if (FindConditionalOverload(*this, LHS, RHS, QuestionLoc))
2263 // LValue-to-rvalue, array-to-pointer, and function-to-pointer standard
2264 // conversions are performed on the second and third operands.
2265 DefaultFunctionArrayLvalueConversion(LHS);
2266 DefaultFunctionArrayLvalueConversion(RHS);
2267 LTy = LHS->getType();
2268 RTy = RHS->getType();
2270 // After those conversions, one of the following shall hold:
2271 // -- The second and third operands have the same type; the result
2272 // is of that type. If the operands have class type, the result
2273 // is a prvalue temporary of the result type, which is
2274 // copy-initialized from either the second operand or the third
2275 // operand depending on the value of the first operand.
2276 if (Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy)) {
2277 if (LTy->isRecordType()) {
2278 // The operands have class type. Make a temporary copy.
2279 InitializedEntity Entity = InitializedEntity::InitializeTemporary(LTy);
2280 OwningExprResult LHSCopy = PerformCopyInitialization(Entity,
2283 if (LHSCopy.isInvalid())
2286 OwningExprResult RHSCopy = PerformCopyInitialization(Entity,
2289 if (RHSCopy.isInvalid())
2292 LHS = LHSCopy.takeAs<Expr>();
2293 RHS = RHSCopy.takeAs<Expr>();
2299 // Extension: conditional operator involving vector types.
2300 if (LTy->isVectorType() || RTy->isVectorType())
2301 return CheckVectorOperands(QuestionLoc, LHS, RHS);
2303 // -- The second and third operands have arithmetic or enumeration type;
2304 // the usual arithmetic conversions are performed to bring them to a
2305 // common type, and the result is of that type.
2306 if (LTy->isArithmeticType() && RTy->isArithmeticType()) {
2307 UsualArithmeticConversions(LHS, RHS);
2308 return LHS->getType();
2311 // -- The second and third operands have pointer type, or one has pointer
2312 // type and the other is a null pointer constant; pointer conversions
2313 // and qualification conversions are performed to bring them to their
2314 // composite pointer type. The result is of the composite pointer type.
2315 // -- The second and third operands have pointer to member type, or one has
2316 // pointer to member type and the other is a null pointer constant;
2317 // pointer to member conversions and qualification conversions are
2318 // performed to bring them to a common type, whose cv-qualification
2319 // shall match the cv-qualification of either the second or the third
2320 // operand. The result is of the common type.
2321 bool NonStandardCompositeType = false;
2322 QualType Composite = FindCompositePointerType(QuestionLoc, LHS, RHS,
2323 isSFINAEContext()? 0 : &NonStandardCompositeType);
2324 if (!Composite.isNull()) {
2325 if (NonStandardCompositeType)
2327 diag::ext_typecheck_cond_incompatible_operands_nonstandard)
2328 << LTy << RTy << Composite
2329 << LHS->getSourceRange() << RHS->getSourceRange();
2334 // Similarly, attempt to find composite type of two objective-c pointers.
2335 Composite = FindCompositeObjCPointerType(LHS, RHS, QuestionLoc);
2336 if (!Composite.isNull())
2339 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
2340 << LHS->getType() << RHS->getType()
2341 << LHS->getSourceRange() << RHS->getSourceRange();
2345 /// \brief Find a merged pointer type and convert the two expressions to it.
2347 /// This finds the composite pointer type (or member pointer type) for @p E1
2348 /// and @p E2 according to C++0x 5.9p2. It converts both expressions to this
2349 /// type and returns it.
2350 /// It does not emit diagnostics.
2352 /// \param Loc The location of the operator requiring these two expressions to
2353 /// be converted to the composite pointer type.
2355 /// If \p NonStandardCompositeType is non-NULL, then we are permitted to find
2356 /// a non-standard (but still sane) composite type to which both expressions
2357 /// can be converted. When such a type is chosen, \c *NonStandardCompositeType
2358 /// will be set true.
2359 QualType Sema::FindCompositePointerType(SourceLocation Loc,
2360 Expr *&E1, Expr *&E2,
2361 bool *NonStandardCompositeType) {
2362 if (NonStandardCompositeType)
2363 *NonStandardCompositeType = false;
2365 assert(getLangOptions().CPlusPlus && "This function assumes C++");
2366 QualType T1 = E1->getType(), T2 = E2->getType();
2368 if (!T1->isAnyPointerType() && !T1->isMemberPointerType() &&
2369 !T2->isAnyPointerType() && !T2->isMemberPointerType())
2373 // Pointer conversions and qualification conversions are performed on
2374 // pointer operands to bring them to their composite pointer type. If
2375 // one operand is a null pointer constant, the composite pointer type is
2376 // the type of the other operand.
2377 if (E1->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
2378 if (T2->isMemberPointerType())
2379 ImpCastExprToType(E1, T2, CastExpr::CK_NullToMemberPointer);
2381 ImpCastExprToType(E1, T2, CastExpr::CK_IntegralToPointer);
2384 if (E2->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
2385 if (T1->isMemberPointerType())
2386 ImpCastExprToType(E2, T1, CastExpr::CK_NullToMemberPointer);
2388 ImpCastExprToType(E2, T1, CastExpr::CK_IntegralToPointer);
2392 // Now both have to be pointers or member pointers.
2393 if ((!T1->isPointerType() && !T1->isMemberPointerType()) ||
2394 (!T2->isPointerType() && !T2->isMemberPointerType()))
2397 // Otherwise, of one of the operands has type "pointer to cv1 void," then
2398 // the other has type "pointer to cv2 T" and the composite pointer type is
2399 // "pointer to cv12 void," where cv12 is the union of cv1 and cv2.
2400 // Otherwise, the composite pointer type is a pointer type similar to the
2401 // type of one of the operands, with a cv-qualification signature that is
2402 // the union of the cv-qualification signatures of the operand types.
2403 // In practice, the first part here is redundant; it's subsumed by the second.
2404 // What we do here is, we build the two possible composite types, and try the
2405 // conversions in both directions. If only one works, or if the two composite
2406 // types are the same, we have succeeded.
2407 // FIXME: extended qualifiers?
2408 typedef llvm::SmallVector<unsigned, 4> QualifierVector;
2409 QualifierVector QualifierUnion;
2410 typedef llvm::SmallVector<std::pair<const Type *, const Type *>, 4>
2411 ContainingClassVector;
2412 ContainingClassVector MemberOfClass;
2413 QualType Composite1 = Context.getCanonicalType(T1),
2414 Composite2 = Context.getCanonicalType(T2);
2415 unsigned NeedConstBefore = 0;
2417 const PointerType *Ptr1, *Ptr2;
2418 if ((Ptr1 = Composite1->getAs<PointerType>()) &&
2419 (Ptr2 = Composite2->getAs<PointerType>())) {
2420 Composite1 = Ptr1->getPointeeType();
2421 Composite2 = Ptr2->getPointeeType();
2423 // If we're allowed to create a non-standard composite type, keep track
2424 // of where we need to fill in additional 'const' qualifiers.
2425 if (NonStandardCompositeType &&
2426 Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers())
2427 NeedConstBefore = QualifierUnion.size();
2429 QualifierUnion.push_back(
2430 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
2431 MemberOfClass.push_back(std::make_pair((const Type *)0, (const Type *)0));
2435 const MemberPointerType *MemPtr1, *MemPtr2;
2436 if ((MemPtr1 = Composite1->getAs<MemberPointerType>()) &&
2437 (MemPtr2 = Composite2->getAs<MemberPointerType>())) {
2438 Composite1 = MemPtr1->getPointeeType();
2439 Composite2 = MemPtr2->getPointeeType();
2441 // If we're allowed to create a non-standard composite type, keep track
2442 // of where we need to fill in additional 'const' qualifiers.
2443 if (NonStandardCompositeType &&
2444 Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers())
2445 NeedConstBefore = QualifierUnion.size();
2447 QualifierUnion.push_back(
2448 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
2449 MemberOfClass.push_back(std::make_pair(MemPtr1->getClass(),
2450 MemPtr2->getClass()));
2454 // FIXME: block pointer types?
2456 // Cannot unwrap any more types.
2460 if (NeedConstBefore && NonStandardCompositeType) {
2461 // Extension: Add 'const' to qualifiers that come before the first qualifier
2462 // mismatch, so that our (non-standard!) composite type meets the
2463 // requirements of C++ [conv.qual]p4 bullet 3.
2464 for (unsigned I = 0; I != NeedConstBefore; ++I) {
2465 if ((QualifierUnion[I] & Qualifiers::Const) == 0) {
2466 QualifierUnion[I] = QualifierUnion[I] | Qualifiers::Const;
2467 *NonStandardCompositeType = true;
2472 // Rewrap the composites as pointers or member pointers with the union CVRs.
2473 ContainingClassVector::reverse_iterator MOC
2474 = MemberOfClass.rbegin();
2475 for (QualifierVector::reverse_iterator
2476 I = QualifierUnion.rbegin(),
2477 E = QualifierUnion.rend();
2478 I != E; (void)++I, ++MOC) {
2479 Qualifiers Quals = Qualifiers::fromCVRMask(*I);
2480 if (MOC->first && MOC->second) {
2481 // Rebuild member pointer type
2482 Composite1 = Context.getMemberPointerType(
2483 Context.getQualifiedType(Composite1, Quals),
2485 Composite2 = Context.getMemberPointerType(
2486 Context.getQualifiedType(Composite2, Quals),
2489 // Rebuild pointer type
2491 = Context.getPointerType(Context.getQualifiedType(Composite1, Quals));
2493 = Context.getPointerType(Context.getQualifiedType(Composite2, Quals));
2497 // Try to convert to the first composite pointer type.
2498 InitializedEntity Entity1
2499 = InitializedEntity::InitializeTemporary(Composite1);
2500 InitializationKind Kind
2501 = InitializationKind::CreateCopy(Loc, SourceLocation());
2502 InitializationSequence E1ToC1(*this, Entity1, Kind, &E1, 1);
2503 InitializationSequence E2ToC1(*this, Entity1, Kind, &E2, 1);
2505 if (E1ToC1 && E2ToC1) {
2506 // Conversion to Composite1 is viable.
2507 if (!Context.hasSameType(Composite1, Composite2)) {
2508 // Composite2 is a different type from Composite1. Check whether
2509 // Composite2 is also viable.
2510 InitializedEntity Entity2
2511 = InitializedEntity::InitializeTemporary(Composite2);
2512 InitializationSequence E1ToC2(*this, Entity2, Kind, &E1, 1);
2513 InitializationSequence E2ToC2(*this, Entity2, Kind, &E2, 1);
2514 if (E1ToC2 && E2ToC2) {
2515 // Both Composite1 and Composite2 are viable and are different;
2516 // this is an ambiguity.
2521 // Convert E1 to Composite1
2522 OwningExprResult E1Result
2523 = E1ToC1.Perform(*this, Entity1, Kind, MultiExprArg(*this,(void**)&E1,1));
2524 if (E1Result.isInvalid())
2526 E1 = E1Result.takeAs<Expr>();
2528 // Convert E2 to Composite1
2529 OwningExprResult E2Result
2530 = E2ToC1.Perform(*this, Entity1, Kind, MultiExprArg(*this,(void**)&E2,1));
2531 if (E2Result.isInvalid())
2533 E2 = E2Result.takeAs<Expr>();
2538 // Check whether Composite2 is viable.
2539 InitializedEntity Entity2
2540 = InitializedEntity::InitializeTemporary(Composite2);
2541 InitializationSequence E1ToC2(*this, Entity2, Kind, &E1, 1);
2542 InitializationSequence E2ToC2(*this, Entity2, Kind, &E2, 1);
2543 if (!E1ToC2 || !E2ToC2)
2546 // Convert E1 to Composite2
2547 OwningExprResult E1Result
2548 = E1ToC2.Perform(*this, Entity2, Kind, MultiExprArg(*this, (void**)&E1, 1));
2549 if (E1Result.isInvalid())
2551 E1 = E1Result.takeAs<Expr>();
2553 // Convert E2 to Composite2
2554 OwningExprResult E2Result
2555 = E2ToC2.Perform(*this, Entity2, Kind, MultiExprArg(*this, (void**)&E2, 1));
2556 if (E2Result.isInvalid())
2558 E2 = E2Result.takeAs<Expr>();
2563 Sema::OwningExprResult Sema::MaybeBindToTemporary(Expr *E) {
2564 if (!Context.getLangOptions().CPlusPlus)
2567 assert(!isa<CXXBindTemporaryExpr>(E) && "Double-bound temporary?");
2569 const RecordType *RT = E->getType()->getAs<RecordType>();
2573 // If this is the result of a call expression, our source might
2574 // actually be a reference, in which case we shouldn't bind.
2575 if (CallExpr *CE = dyn_cast<CallExpr>(E)) {
2576 QualType Ty = CE->getCallee()->getType();
2577 if (const PointerType *PT = Ty->getAs<PointerType>())
2578 Ty = PT->getPointeeType();
2579 else if (const BlockPointerType *BPT = Ty->getAs<BlockPointerType>())
2580 Ty = BPT->getPointeeType();
2582 const FunctionType *FTy = Ty->getAs<FunctionType>();
2583 if (FTy->getResultType()->isReferenceType())
2587 // That should be enough to guarantee that this type is complete.
2588 // If it has a trivial destructor, we can avoid the extra copy.
2589 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
2590 if (RD->hasTrivialDestructor())
2593 CXXTemporary *Temp = CXXTemporary::Create(Context,
2594 RD->getDestructor(Context));
2595 ExprTemporaries.push_back(Temp);
2596 if (CXXDestructorDecl *Destructor =
2597 const_cast<CXXDestructorDecl*>(RD->getDestructor(Context))) {
2598 MarkDeclarationReferenced(E->getExprLoc(), Destructor);
2599 CheckDestructorAccess(E->getExprLoc(), Destructor,
2600 PDiag(diag::err_access_dtor_temp)
2603 // FIXME: Add the temporary to the temporaries vector.
2604 return Owned(CXXBindTemporaryExpr::Create(Context, Temp, E));
2607 Expr *Sema::MaybeCreateCXXExprWithTemporaries(Expr *SubExpr) {
2608 assert(SubExpr && "sub expression can't be null!");
2610 // Check any implicit conversions within the expression.
2611 CheckImplicitConversions(SubExpr);
2613 unsigned FirstTemporary = ExprEvalContexts.back().NumTemporaries;
2614 assert(ExprTemporaries.size() >= FirstTemporary);
2615 if (ExprTemporaries.size() == FirstTemporary)
2618 Expr *E = CXXExprWithTemporaries::Create(Context, SubExpr,
2619 &ExprTemporaries[FirstTemporary],
2620 ExprTemporaries.size() - FirstTemporary);
2621 ExprTemporaries.erase(ExprTemporaries.begin() + FirstTemporary,
2622 ExprTemporaries.end());
2627 Sema::OwningExprResult
2628 Sema::MaybeCreateCXXExprWithTemporaries(OwningExprResult SubExpr) {
2629 if (SubExpr.isInvalid())
2632 return Owned(MaybeCreateCXXExprWithTemporaries(SubExpr.takeAs<Expr>()));
2635 FullExpr Sema::CreateFullExpr(Expr *SubExpr) {
2636 unsigned FirstTemporary = ExprEvalContexts.back().NumTemporaries;
2637 assert(ExprTemporaries.size() >= FirstTemporary);
2639 unsigned NumTemporaries = ExprTemporaries.size() - FirstTemporary;
2640 CXXTemporary **Temporaries =
2641 NumTemporaries == 0 ? 0 : &ExprTemporaries[FirstTemporary];
2643 FullExpr E = FullExpr::Create(Context, SubExpr, Temporaries, NumTemporaries);
2645 ExprTemporaries.erase(ExprTemporaries.begin() + FirstTemporary,
2646 ExprTemporaries.end());
2651 Sema::OwningExprResult
2652 Sema::ActOnStartCXXMemberReference(Scope *S, ExprArg Base, SourceLocation OpLoc,
2653 tok::TokenKind OpKind, TypeTy *&ObjectType,
2654 bool &MayBePseudoDestructor) {
2655 // Since this might be a postfix expression, get rid of ParenListExprs.
2656 Base = MaybeConvertParenListExprToParenExpr(S, move(Base));
2658 Expr *BaseExpr = (Expr*)Base.get();
2659 assert(BaseExpr && "no record expansion");
2661 QualType BaseType = BaseExpr->getType();
2662 MayBePseudoDestructor = false;
2663 if (BaseType->isDependentType()) {
2664 // If we have a pointer to a dependent type and are using the -> operator,
2665 // the object type is the type that the pointer points to. We might still
2666 // have enough information about that type to do something useful.
2667 if (OpKind == tok::arrow)
2668 if (const PointerType *Ptr = BaseType->getAs<PointerType>())
2669 BaseType = Ptr->getPointeeType();
2671 ObjectType = BaseType.getAsOpaquePtr();
2672 MayBePseudoDestructor = true;
2676 // C++ [over.match.oper]p8:
2677 // [...] When operator->returns, the operator-> is applied to the value
2678 // returned, with the original second operand.
2679 if (OpKind == tok::arrow) {
2680 // The set of types we've considered so far.
2681 llvm::SmallPtrSet<CanQualType,8> CTypes;
2682 llvm::SmallVector<SourceLocation, 8> Locations;
2683 CTypes.insert(Context.getCanonicalType(BaseType));
2685 while (BaseType->isRecordType()) {
2686 Base = BuildOverloadedArrowExpr(S, move(Base), OpLoc);
2687 BaseExpr = (Expr*)Base.get();
2688 if (BaseExpr == NULL)
2690 if (CXXOperatorCallExpr *OpCall = dyn_cast<CXXOperatorCallExpr>(BaseExpr))
2691 Locations.push_back(OpCall->getDirectCallee()->getLocation());
2692 BaseType = BaseExpr->getType();
2693 CanQualType CBaseType = Context.getCanonicalType(BaseType);
2694 if (!CTypes.insert(CBaseType)) {
2695 Diag(OpLoc, diag::err_operator_arrow_circular);
2696 for (unsigned i = 0; i < Locations.size(); i++)
2697 Diag(Locations[i], diag::note_declared_at);
2702 if (BaseType->isPointerType())
2703 BaseType = BaseType->getPointeeType();
2706 // We could end up with various non-record types here, such as extended
2707 // vector types or Objective-C interfaces. Just return early and let
2708 // ActOnMemberReferenceExpr do the work.
2709 if (!BaseType->isRecordType()) {
2710 // C++ [basic.lookup.classref]p2:
2711 // [...] If the type of the object expression is of pointer to scalar
2712 // type, the unqualified-id is looked up in the context of the complete
2713 // postfix-expression.
2715 // This also indicates that we should be parsing a
2716 // pseudo-destructor-name.
2718 MayBePseudoDestructor = true;
2722 // The object type must be complete (or dependent).
2723 if (!BaseType->isDependentType() &&
2724 RequireCompleteType(OpLoc, BaseType,
2725 PDiag(diag::err_incomplete_member_access)))
2728 // C++ [basic.lookup.classref]p2:
2729 // If the id-expression in a class member access (5.2.5) is an
2730 // unqualified-id, and the type of the object expression is of a class
2731 // type C (or of pointer to a class type C), the unqualified-id is looked
2732 // up in the scope of class C. [...]
2733 ObjectType = BaseType.getAsOpaquePtr();
2737 Sema::OwningExprResult Sema::DiagnoseDtorReference(SourceLocation NameLoc,
2739 Expr *E = (Expr *) MemExpr.get();
2740 SourceLocation ExpectedLParenLoc = PP.getLocForEndOfToken(NameLoc);
2741 Diag(E->getLocStart(), diag::err_dtor_expr_without_call)
2742 << isa<CXXPseudoDestructorExpr>(E)
2743 << FixItHint::CreateInsertion(ExpectedLParenLoc, "()");
2745 return ActOnCallExpr(/*Scope*/ 0,
2747 /*LPLoc*/ ExpectedLParenLoc,
2748 Sema::MultiExprArg(*this, 0, 0),
2750 /*RPLoc*/ ExpectedLParenLoc);
2753 Sema::OwningExprResult Sema::BuildPseudoDestructorExpr(ExprArg Base,
2754 SourceLocation OpLoc,
2755 tok::TokenKind OpKind,
2756 const CXXScopeSpec &SS,
2757 TypeSourceInfo *ScopeTypeInfo,
2758 SourceLocation CCLoc,
2759 SourceLocation TildeLoc,
2760 PseudoDestructorTypeStorage Destructed,
2761 bool HasTrailingLParen) {
2762 TypeSourceInfo *DestructedTypeInfo = Destructed.getTypeSourceInfo();
2764 // C++ [expr.pseudo]p2:
2765 // The left-hand side of the dot operator shall be of scalar type. The
2766 // left-hand side of the arrow operator shall be of pointer to scalar type.
2767 // This scalar type is the object type.
2768 Expr *BaseE = (Expr *)Base.get();
2769 QualType ObjectType = BaseE->getType();
2770 if (OpKind == tok::arrow) {
2771 if (const PointerType *Ptr = ObjectType->getAs<PointerType>()) {
2772 ObjectType = Ptr->getPointeeType();
2773 } else if (!BaseE->isTypeDependent()) {
2774 // The user wrote "p->" when she probably meant "p."; fix it.
2775 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
2776 << ObjectType << true
2777 << FixItHint::CreateReplacement(OpLoc, ".");
2778 if (isSFINAEContext())
2781 OpKind = tok::period;
2785 if (!ObjectType->isDependentType() && !ObjectType->isScalarType()) {
2786 Diag(OpLoc, diag::err_pseudo_dtor_base_not_scalar)
2787 << ObjectType << BaseE->getSourceRange();
2791 // C++ [expr.pseudo]p2:
2792 // [...] The cv-unqualified versions of the object type and of the type
2793 // designated by the pseudo-destructor-name shall be the same type.
2794 if (DestructedTypeInfo) {
2795 QualType DestructedType = DestructedTypeInfo->getType();
2796 SourceLocation DestructedTypeStart
2797 = DestructedTypeInfo->getTypeLoc().getLocalSourceRange().getBegin();
2798 if (!DestructedType->isDependentType() && !ObjectType->isDependentType() &&
2799 !Context.hasSameUnqualifiedType(DestructedType, ObjectType)) {
2800 Diag(DestructedTypeStart, diag::err_pseudo_dtor_type_mismatch)
2801 << ObjectType << DestructedType << BaseE->getSourceRange()
2802 << DestructedTypeInfo->getTypeLoc().getLocalSourceRange();
2804 // Recover by setting the destructed type to the object type.
2805 DestructedType = ObjectType;
2806 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(ObjectType,
2807 DestructedTypeStart);
2808 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
2812 // C++ [expr.pseudo]p2:
2813 // [...] Furthermore, the two type-names in a pseudo-destructor-name of the
2816 // ::[opt] nested-name-specifier[opt] type-name :: ~ type-name
2818 // shall designate the same scalar type.
2819 if (ScopeTypeInfo) {
2820 QualType ScopeType = ScopeTypeInfo->getType();
2821 if (!ScopeType->isDependentType() && !ObjectType->isDependentType() &&
2822 !Context.hasSameType(ScopeType, ObjectType)) {
2824 Diag(ScopeTypeInfo->getTypeLoc().getLocalSourceRange().getBegin(),
2825 diag::err_pseudo_dtor_type_mismatch)
2826 << ObjectType << ScopeType << BaseE->getSourceRange()
2827 << ScopeTypeInfo->getTypeLoc().getLocalSourceRange();
2829 ScopeType = QualType();
2834 OwningExprResult Result
2835 = Owned(new (Context) CXXPseudoDestructorExpr(Context,
2836 Base.takeAs<Expr>(),
2837 OpKind == tok::arrow,
2839 (NestedNameSpecifier *) SS.getScopeRep(),
2846 if (HasTrailingLParen)
2847 return move(Result);
2849 return DiagnoseDtorReference(Destructed.getLocation(), move(Result));
2852 Sema::OwningExprResult Sema::ActOnPseudoDestructorExpr(Scope *S, ExprArg Base,
2853 SourceLocation OpLoc,
2854 tok::TokenKind OpKind,
2856 UnqualifiedId &FirstTypeName,
2857 SourceLocation CCLoc,
2858 SourceLocation TildeLoc,
2859 UnqualifiedId &SecondTypeName,
2860 bool HasTrailingLParen) {
2861 assert((FirstTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
2862 FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) &&
2863 "Invalid first type name in pseudo-destructor");
2864 assert((SecondTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
2865 SecondTypeName.getKind() == UnqualifiedId::IK_Identifier) &&
2866 "Invalid second type name in pseudo-destructor");
2868 Expr *BaseE = (Expr *)Base.get();
2870 // C++ [expr.pseudo]p2:
2871 // The left-hand side of the dot operator shall be of scalar type. The
2872 // left-hand side of the arrow operator shall be of pointer to scalar type.
2873 // This scalar type is the object type.
2874 QualType ObjectType = BaseE->getType();
2875 if (OpKind == tok::arrow) {
2876 if (const PointerType *Ptr = ObjectType->getAs<PointerType>()) {
2877 ObjectType = Ptr->getPointeeType();
2878 } else if (!ObjectType->isDependentType()) {
2879 // The user wrote "p->" when she probably meant "p."; fix it.
2880 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
2881 << ObjectType << true
2882 << FixItHint::CreateReplacement(OpLoc, ".");
2883 if (isSFINAEContext())
2886 OpKind = tok::period;
2890 // Compute the object type that we should use for name lookup purposes. Only
2891 // record types and dependent types matter.
2892 void *ObjectTypePtrForLookup = 0;
2894 ObjectTypePtrForLookup = (void *)ObjectType->getAs<RecordType>();
2895 if (!ObjectTypePtrForLookup && ObjectType->isDependentType())
2896 ObjectTypePtrForLookup = Context.DependentTy.getAsOpaquePtr();
2899 // Convert the name of the type being destructed (following the ~) into a
2900 // type (with source-location information).
2901 QualType DestructedType;
2902 TypeSourceInfo *DestructedTypeInfo = 0;
2903 PseudoDestructorTypeStorage Destructed;
2904 if (SecondTypeName.getKind() == UnqualifiedId::IK_Identifier) {
2905 TypeTy *T = getTypeName(*SecondTypeName.Identifier,
2906 SecondTypeName.StartLocation,
2907 S, &SS, true, ObjectTypePtrForLookup);
2909 ((SS.isSet() && !computeDeclContext(SS, false)) ||
2910 (!SS.isSet() && ObjectType->isDependentType()))) {
2911 // The name of the type being destroyed is a dependent name, and we
2912 // couldn't find anything useful in scope. Just store the identifier and
2913 // it's location, and we'll perform (qualified) name lookup again at
2914 // template instantiation time.
2915 Destructed = PseudoDestructorTypeStorage(SecondTypeName.Identifier,
2916 SecondTypeName.StartLocation);
2918 Diag(SecondTypeName.StartLocation,
2919 diag::err_pseudo_dtor_destructor_non_type)
2920 << SecondTypeName.Identifier << ObjectType;
2921 if (isSFINAEContext())
2924 // Recover by assuming we had the right type all along.
2925 DestructedType = ObjectType;
2927 DestructedType = GetTypeFromParser(T, &DestructedTypeInfo);
2929 // Resolve the template-id to a type.
2930 TemplateIdAnnotation *TemplateId = SecondTypeName.TemplateId;
2931 ASTTemplateArgsPtr TemplateArgsPtr(*this,
2932 TemplateId->getTemplateArgs(),
2933 TemplateId->NumArgs);
2934 TypeResult T = ActOnTemplateIdType(TemplateTy::make(TemplateId->Template),
2935 TemplateId->TemplateNameLoc,
2936 TemplateId->LAngleLoc,
2938 TemplateId->RAngleLoc);
2939 if (T.isInvalid() || !T.get()) {
2940 // Recover by assuming we had the right type all along.
2941 DestructedType = ObjectType;
2943 DestructedType = GetTypeFromParser(T.get(), &DestructedTypeInfo);
2946 // If we've performed some kind of recovery, (re-)build the type source
2948 if (!DestructedType.isNull()) {
2949 if (!DestructedTypeInfo)
2950 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(DestructedType,
2951 SecondTypeName.StartLocation);
2952 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
2955 // Convert the name of the scope type (the type prior to '::') into a type.
2956 TypeSourceInfo *ScopeTypeInfo = 0;
2958 if (FirstTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
2959 FirstTypeName.Identifier) {
2960 if (FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) {
2961 TypeTy *T = getTypeName(*FirstTypeName.Identifier,
2962 FirstTypeName.StartLocation,
2963 S, &SS, false, ObjectTypePtrForLookup);
2965 Diag(FirstTypeName.StartLocation,
2966 diag::err_pseudo_dtor_destructor_non_type)
2967 << FirstTypeName.Identifier << ObjectType;
2969 if (isSFINAEContext())
2972 // Just drop this type. It's unnecessary anyway.
2973 ScopeType = QualType();
2975 ScopeType = GetTypeFromParser(T, &ScopeTypeInfo);
2977 // Resolve the template-id to a type.
2978 TemplateIdAnnotation *TemplateId = FirstTypeName.TemplateId;
2979 ASTTemplateArgsPtr TemplateArgsPtr(*this,
2980 TemplateId->getTemplateArgs(),
2981 TemplateId->NumArgs);
2982 TypeResult T = ActOnTemplateIdType(TemplateTy::make(TemplateId->Template),
2983 TemplateId->TemplateNameLoc,
2984 TemplateId->LAngleLoc,
2986 TemplateId->RAngleLoc);
2987 if (T.isInvalid() || !T.get()) {
2988 // Recover by dropping this type.
2989 ScopeType = QualType();
2991 ScopeType = GetTypeFromParser(T.get(), &ScopeTypeInfo);
2995 if (!ScopeType.isNull() && !ScopeTypeInfo)
2996 ScopeTypeInfo = Context.getTrivialTypeSourceInfo(ScopeType,
2997 FirstTypeName.StartLocation);
3000 return BuildPseudoDestructorExpr(move(Base), OpLoc, OpKind, SS,
3001 ScopeTypeInfo, CCLoc, TildeLoc,
3002 Destructed, HasTrailingLParen);
3005 CXXMemberCallExpr *Sema::BuildCXXMemberCallExpr(Expr *Exp,
3006 NamedDecl *FoundDecl,
3007 CXXMethodDecl *Method) {
3008 if (PerformObjectArgumentInitialization(Exp, /*Qualifier=*/0,
3010 assert(0 && "Calling BuildCXXMemberCallExpr with invalid call?");
3013 new (Context) MemberExpr(Exp, /*IsArrow=*/false, Method,
3014 SourceLocation(), Method->getType());
3015 QualType ResultType = Method->getResultType().getNonReferenceType();
3016 MarkDeclarationReferenced(Exp->getLocStart(), Method);
3017 CXXMemberCallExpr *CE =
3018 new (Context) CXXMemberCallExpr(Context, ME, 0, 0, ResultType,
3023 Sema::OwningExprResult Sema::ActOnFinishFullExpr(ExprArg Arg) {
3024 Expr *FullExpr = Arg.takeAs<Expr>();
3026 FullExpr = MaybeCreateCXXExprWithTemporaries(FullExpr);
3030 return Owned(FullExpr);