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 //===----------------------------------------------------------------------===//
11 /// \brief Implements semantic analysis for C++ expressions.
13 //===----------------------------------------------------------------------===//
15 #include "clang/Sema/SemaInternal.h"
16 #include "TypeLocBuilder.h"
17 #include "clang/AST/ASTContext.h"
18 #include "clang/AST/CXXInheritance.h"
19 #include "clang/AST/CharUnits.h"
20 #include "clang/AST/DeclObjC.h"
21 #include "clang/AST/EvaluatedExprVisitor.h"
22 #include "clang/AST/ExprCXX.h"
23 #include "clang/AST/ExprObjC.h"
24 #include "clang/AST/TypeLoc.h"
25 #include "clang/Basic/PartialDiagnostic.h"
26 #include "clang/Basic/TargetInfo.h"
27 #include "clang/Lex/Preprocessor.h"
28 #include "clang/Sema/DeclSpec.h"
29 #include "clang/Sema/Initialization.h"
30 #include "clang/Sema/Lookup.h"
31 #include "clang/Sema/ParsedTemplate.h"
32 #include "clang/Sema/Scope.h"
33 #include "clang/Sema/ScopeInfo.h"
34 #include "clang/Sema/TemplateDeduction.h"
35 #include "llvm/ADT/APInt.h"
36 #include "llvm/ADT/STLExtras.h"
37 #include "llvm/Support/ErrorHandling.h"
38 using namespace clang;
41 /// \brief Handle the result of the special case name lookup for inheriting
42 /// constructor declarations. 'NS::X::X' and 'NS::X<...>::X' are treated as
43 /// constructor names in member using declarations, even if 'X' is not the
44 /// name of the corresponding type.
45 ParsedType Sema::getInheritingConstructorName(CXXScopeSpec &SS,
46 SourceLocation NameLoc,
47 IdentifierInfo &Name) {
48 NestedNameSpecifier *NNS = SS.getScopeRep();
50 // Convert the nested-name-specifier into a type.
52 switch (NNS->getKind()) {
53 case NestedNameSpecifier::TypeSpec:
54 case NestedNameSpecifier::TypeSpecWithTemplate:
55 Type = QualType(NNS->getAsType(), 0);
58 case NestedNameSpecifier::Identifier:
59 // Strip off the last layer of the nested-name-specifier and build a
60 // typename type for it.
61 assert(NNS->getAsIdentifier() == &Name && "not a constructor name");
62 Type = Context.getDependentNameType(ETK_None, NNS->getPrefix(),
63 NNS->getAsIdentifier());
66 case NestedNameSpecifier::Global:
67 case NestedNameSpecifier::Namespace:
68 case NestedNameSpecifier::NamespaceAlias:
69 llvm_unreachable("Nested name specifier is not a type for inheriting ctor");
72 // This reference to the type is located entirely at the location of the
73 // final identifier in the qualified-id.
74 return CreateParsedType(Type,
75 Context.getTrivialTypeSourceInfo(Type, NameLoc));
78 ParsedType Sema::getDestructorName(SourceLocation TildeLoc,
80 SourceLocation NameLoc,
81 Scope *S, CXXScopeSpec &SS,
82 ParsedType ObjectTypePtr,
83 bool EnteringContext) {
84 // Determine where to perform name lookup.
86 // FIXME: This area of the standard is very messy, and the current
87 // wording is rather unclear about which scopes we search for the
88 // destructor name; see core issues 399 and 555. Issue 399 in
89 // particular shows where the current description of destructor name
90 // lookup is completely out of line with existing practice, e.g.,
91 // this appears to be ill-formed:
94 // template <typename T> struct S {
99 // void f(N::S<int>* s) {
100 // s->N::S<int>::~S();
103 // See also PR6358 and PR6359.
104 // For this reason, we're currently only doing the C++03 version of this
105 // code; the C++0x version has to wait until we get a proper spec.
107 DeclContext *LookupCtx = 0;
108 bool isDependent = false;
109 bool LookInScope = false;
111 // If we have an object type, it's because we are in a
112 // pseudo-destructor-expression or a member access expression, and
113 // we know what type we're looking for.
115 SearchType = GetTypeFromParser(ObjectTypePtr);
118 NestedNameSpecifier *NNS = (NestedNameSpecifier *)SS.getScopeRep();
120 bool AlreadySearched = false;
121 bool LookAtPrefix = true;
122 // C++ [basic.lookup.qual]p6:
123 // If a pseudo-destructor-name (5.2.4) contains a nested-name-specifier,
124 // the type-names are looked up as types in the scope designated by the
125 // nested-name-specifier. In a qualified-id of the form:
127 // ::[opt] nested-name-specifier ~ class-name
129 // where the nested-name-specifier designates a namespace scope, and in
130 // a qualified-id of the form:
132 // ::opt nested-name-specifier class-name :: ~ class-name
134 // the class-names are looked up as types in the scope designated by
135 // the nested-name-specifier.
137 // Here, we check the first case (completely) and determine whether the
138 // code below is permitted to look at the prefix of the
139 // nested-name-specifier.
140 DeclContext *DC = computeDeclContext(SS, EnteringContext);
141 if (DC && DC->isFileContext()) {
142 AlreadySearched = true;
145 } else if (DC && isa<CXXRecordDecl>(DC))
146 LookAtPrefix = false;
148 // The second case from the C++03 rules quoted further above.
149 NestedNameSpecifier *Prefix = 0;
150 if (AlreadySearched) {
151 // Nothing left to do.
152 } else if (LookAtPrefix && (Prefix = NNS->getPrefix())) {
153 CXXScopeSpec PrefixSS;
154 PrefixSS.Adopt(NestedNameSpecifierLoc(Prefix, SS.location_data()));
155 LookupCtx = computeDeclContext(PrefixSS, EnteringContext);
156 isDependent = isDependentScopeSpecifier(PrefixSS);
157 } else if (ObjectTypePtr) {
158 LookupCtx = computeDeclContext(SearchType);
159 isDependent = SearchType->isDependentType();
161 LookupCtx = computeDeclContext(SS, EnteringContext);
162 isDependent = LookupCtx && LookupCtx->isDependentContext();
166 } else if (ObjectTypePtr) {
167 // C++ [basic.lookup.classref]p3:
168 // If the unqualified-id is ~type-name, the type-name is looked up
169 // in the context of the entire postfix-expression. If the type T
170 // of the object expression is of a class type C, the type-name is
171 // also looked up in the scope of class C. At least one of the
172 // lookups shall find a name that refers to (possibly
174 LookupCtx = computeDeclContext(SearchType);
175 isDependent = SearchType->isDependentType();
176 assert((isDependent || !SearchType->isIncompleteType()) &&
177 "Caller should have completed object type");
181 // Perform lookup into the current scope (only).
185 TypeDecl *NonMatchingTypeDecl = 0;
186 LookupResult Found(*this, &II, NameLoc, LookupOrdinaryName);
187 for (unsigned Step = 0; Step != 2; ++Step) {
188 // Look for the name first in the computed lookup context (if we
189 // have one) and, if that fails to find a match, in the scope (if
190 // we're allowed to look there).
192 if (Step == 0 && LookupCtx)
193 LookupQualifiedName(Found, LookupCtx);
194 else if (Step == 1 && LookInScope && S)
195 LookupName(Found, S);
199 // FIXME: Should we be suppressing ambiguities here?
200 if (Found.isAmbiguous())
203 if (TypeDecl *Type = Found.getAsSingle<TypeDecl>()) {
204 QualType T = Context.getTypeDeclType(Type);
206 if (SearchType.isNull() || SearchType->isDependentType() ||
207 Context.hasSameUnqualifiedType(T, SearchType)) {
208 // We found our type!
210 return ParsedType::make(T);
213 if (!SearchType.isNull())
214 NonMatchingTypeDecl = Type;
217 // If the name that we found is a class template name, and it is
218 // the same name as the template name in the last part of the
219 // nested-name-specifier (if present) or the object type, then
220 // this is the destructor for that class.
221 // FIXME: This is a workaround until we get real drafting for core
222 // issue 399, for which there isn't even an obvious direction.
223 if (ClassTemplateDecl *Template = Found.getAsSingle<ClassTemplateDecl>()) {
224 QualType MemberOfType;
226 if (DeclContext *Ctx = computeDeclContext(SS, EnteringContext)) {
227 // Figure out the type of the context, if it has one.
228 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx))
229 MemberOfType = Context.getTypeDeclType(Record);
232 if (MemberOfType.isNull())
233 MemberOfType = SearchType;
235 if (MemberOfType.isNull())
238 // We're referring into a class template specialization. If the
239 // class template we found is the same as the template being
240 // specialized, we found what we are looking for.
241 if (const RecordType *Record = MemberOfType->getAs<RecordType>()) {
242 if (ClassTemplateSpecializationDecl *Spec
243 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) {
244 if (Spec->getSpecializedTemplate()->getCanonicalDecl() ==
245 Template->getCanonicalDecl())
246 return ParsedType::make(MemberOfType);
252 // We're referring to an unresolved class template
253 // specialization. Determine whether we class template we found
254 // is the same as the template being specialized or, if we don't
255 // know which template is being specialized, that it at least
256 // has the same name.
257 if (const TemplateSpecializationType *SpecType
258 = MemberOfType->getAs<TemplateSpecializationType>()) {
259 TemplateName SpecName = SpecType->getTemplateName();
261 // The class template we found is the same template being
263 if (TemplateDecl *SpecTemplate = SpecName.getAsTemplateDecl()) {
264 if (SpecTemplate->getCanonicalDecl() == Template->getCanonicalDecl())
265 return ParsedType::make(MemberOfType);
270 // The class template we found has the same name as the
271 // (dependent) template name being specialized.
272 if (DependentTemplateName *DepTemplate
273 = SpecName.getAsDependentTemplateName()) {
274 if (DepTemplate->isIdentifier() &&
275 DepTemplate->getIdentifier() == Template->getIdentifier())
276 return ParsedType::make(MemberOfType);
285 // We didn't find our type, but that's okay: it's dependent
288 // FIXME: What if we have no nested-name-specifier?
289 QualType T = CheckTypenameType(ETK_None, SourceLocation(),
290 SS.getWithLocInContext(Context),
292 return ParsedType::make(T);
295 if (NonMatchingTypeDecl) {
296 QualType T = Context.getTypeDeclType(NonMatchingTypeDecl);
297 Diag(NameLoc, diag::err_destructor_expr_type_mismatch)
299 Diag(NonMatchingTypeDecl->getLocation(), diag::note_destructor_type_here)
301 } else if (ObjectTypePtr)
302 Diag(NameLoc, diag::err_ident_in_dtor_not_a_type)
305 SemaDiagnosticBuilder DtorDiag = Diag(NameLoc,
306 diag::err_destructor_class_name);
308 const DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity());
309 if (const CXXRecordDecl *Class = dyn_cast_or_null<CXXRecordDecl>(Ctx))
310 DtorDiag << FixItHint::CreateReplacement(SourceRange(NameLoc),
311 Class->getNameAsString());
318 ParsedType Sema::getDestructorType(const DeclSpec& DS, ParsedType ObjectType) {
319 if (DS.getTypeSpecType() == DeclSpec::TST_error || !ObjectType)
321 assert(DS.getTypeSpecType() == DeclSpec::TST_decltype
322 && "only get destructor types from declspecs");
323 QualType T = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc());
324 QualType SearchType = GetTypeFromParser(ObjectType);
325 if (SearchType->isDependentType() || Context.hasSameUnqualifiedType(SearchType, T)) {
326 return ParsedType::make(T);
329 Diag(DS.getTypeSpecTypeLoc(), diag::err_destructor_expr_type_mismatch)
334 /// \brief Build a C++ typeid expression with a type operand.
335 ExprResult Sema::BuildCXXTypeId(QualType TypeInfoType,
336 SourceLocation TypeidLoc,
337 TypeSourceInfo *Operand,
338 SourceLocation RParenLoc) {
339 // C++ [expr.typeid]p4:
340 // The top-level cv-qualifiers of the lvalue expression or the type-id
341 // that is the operand of typeid are always ignored.
342 // If the type of the type-id is a class type or a reference to a class
343 // type, the class shall be completely-defined.
346 = Context.getUnqualifiedArrayType(Operand->getType().getNonReferenceType(),
348 if (T->getAs<RecordType>() &&
349 RequireCompleteType(TypeidLoc, T, diag::err_incomplete_typeid))
352 return Owned(new (Context) CXXTypeidExpr(TypeInfoType.withConst(),
354 SourceRange(TypeidLoc, RParenLoc)));
357 /// \brief Build a C++ typeid expression with an expression operand.
358 ExprResult Sema::BuildCXXTypeId(QualType TypeInfoType,
359 SourceLocation TypeidLoc,
361 SourceLocation RParenLoc) {
362 if (E && !E->isTypeDependent()) {
363 if (E->getType()->isPlaceholderType()) {
364 ExprResult result = CheckPlaceholderExpr(E);
365 if (result.isInvalid()) return ExprError();
369 QualType T = E->getType();
370 if (const RecordType *RecordT = T->getAs<RecordType>()) {
371 CXXRecordDecl *RecordD = cast<CXXRecordDecl>(RecordT->getDecl());
372 // C++ [expr.typeid]p3:
373 // [...] If the type of the expression is a class type, the class
374 // shall be completely-defined.
375 if (RequireCompleteType(TypeidLoc, T, diag::err_incomplete_typeid))
378 // C++ [expr.typeid]p3:
379 // When typeid is applied to an expression other than an glvalue of a
380 // polymorphic class type [...] [the] expression is an unevaluated
382 if (RecordD->isPolymorphic() && E->isGLValue()) {
383 // The subexpression is potentially evaluated; switch the context
384 // and recheck the subexpression.
385 ExprResult Result = TransformToPotentiallyEvaluated(E);
386 if (Result.isInvalid()) return ExprError();
389 // We require a vtable to query the type at run time.
390 MarkVTableUsed(TypeidLoc, RecordD);
394 // C++ [expr.typeid]p4:
395 // [...] If the type of the type-id is a reference to a possibly
396 // cv-qualified type, the result of the typeid expression refers to a
397 // std::type_info object representing the cv-unqualified referenced
400 QualType UnqualT = Context.getUnqualifiedArrayType(T, Quals);
401 if (!Context.hasSameType(T, UnqualT)) {
403 E = ImpCastExprToType(E, UnqualT, CK_NoOp, E->getValueKind()).take();
407 return Owned(new (Context) CXXTypeidExpr(TypeInfoType.withConst(),
409 SourceRange(TypeidLoc, RParenLoc)));
412 /// ActOnCXXTypeidOfType - Parse typeid( type-id ) or typeid (expression);
414 Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc,
415 bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
416 // Find the std::type_info type.
417 if (!getStdNamespace())
418 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
420 if (!CXXTypeInfoDecl) {
421 IdentifierInfo *TypeInfoII = &PP.getIdentifierTable().get("type_info");
422 LookupResult R(*this, TypeInfoII, SourceLocation(), LookupTagName);
423 LookupQualifiedName(R, getStdNamespace());
424 CXXTypeInfoDecl = R.getAsSingle<RecordDecl>();
425 // Microsoft's typeinfo doesn't have type_info in std but in the global
426 // namespace if _HAS_EXCEPTIONS is defined to 0. See PR13153.
427 if (!CXXTypeInfoDecl && LangOpts.MicrosoftMode) {
428 LookupQualifiedName(R, Context.getTranslationUnitDecl());
429 CXXTypeInfoDecl = R.getAsSingle<RecordDecl>();
431 if (!CXXTypeInfoDecl)
432 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
435 if (!getLangOpts().RTTI) {
436 return ExprError(Diag(OpLoc, diag::err_no_typeid_with_fno_rtti));
439 QualType TypeInfoType = Context.getTypeDeclType(CXXTypeInfoDecl);
442 // The operand is a type; handle it as such.
443 TypeSourceInfo *TInfo = 0;
444 QualType T = GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrExpr),
450 TInfo = Context.getTrivialTypeSourceInfo(T, OpLoc);
452 return BuildCXXTypeId(TypeInfoType, OpLoc, TInfo, RParenLoc);
455 // The operand is an expression.
456 return BuildCXXTypeId(TypeInfoType, OpLoc, (Expr*)TyOrExpr, RParenLoc);
459 /// \brief Build a Microsoft __uuidof expression with a type operand.
460 ExprResult Sema::BuildCXXUuidof(QualType TypeInfoType,
461 SourceLocation TypeidLoc,
462 TypeSourceInfo *Operand,
463 SourceLocation RParenLoc) {
464 if (!Operand->getType()->isDependentType()) {
465 if (!CXXUuidofExpr::GetUuidAttrOfType(Operand->getType()))
466 return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid));
469 // FIXME: add __uuidof semantic analysis for type operand.
470 return Owned(new (Context) CXXUuidofExpr(TypeInfoType.withConst(),
472 SourceRange(TypeidLoc, RParenLoc)));
475 /// \brief Build a Microsoft __uuidof expression with an expression operand.
476 ExprResult Sema::BuildCXXUuidof(QualType TypeInfoType,
477 SourceLocation TypeidLoc,
479 SourceLocation RParenLoc) {
480 if (!E->getType()->isDependentType()) {
481 if (!CXXUuidofExpr::GetUuidAttrOfType(E->getType()) &&
482 !E->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull))
483 return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid));
485 // FIXME: add __uuidof semantic analysis for type operand.
486 return Owned(new (Context) CXXUuidofExpr(TypeInfoType.withConst(),
488 SourceRange(TypeidLoc, RParenLoc)));
491 /// ActOnCXXUuidof - Parse __uuidof( type-id ) or __uuidof (expression);
493 Sema::ActOnCXXUuidof(SourceLocation OpLoc, SourceLocation LParenLoc,
494 bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
495 // If MSVCGuidDecl has not been cached, do the lookup.
497 IdentifierInfo *GuidII = &PP.getIdentifierTable().get("_GUID");
498 LookupResult R(*this, GuidII, SourceLocation(), LookupTagName);
499 LookupQualifiedName(R, Context.getTranslationUnitDecl());
500 MSVCGuidDecl = R.getAsSingle<RecordDecl>();
502 return ExprError(Diag(OpLoc, diag::err_need_header_before_ms_uuidof));
505 QualType GuidType = Context.getTypeDeclType(MSVCGuidDecl);
508 // The operand is a type; handle it as such.
509 TypeSourceInfo *TInfo = 0;
510 QualType T = GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrExpr),
516 TInfo = Context.getTrivialTypeSourceInfo(T, OpLoc);
518 return BuildCXXUuidof(GuidType, OpLoc, TInfo, RParenLoc);
521 // The operand is an expression.
522 return BuildCXXUuidof(GuidType, OpLoc, (Expr*)TyOrExpr, RParenLoc);
525 /// ActOnCXXBoolLiteral - Parse {true,false} literals.
527 Sema::ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
528 assert((Kind == tok::kw_true || Kind == tok::kw_false) &&
529 "Unknown C++ Boolean value!");
530 return Owned(new (Context) CXXBoolLiteralExpr(Kind == tok::kw_true,
531 Context.BoolTy, OpLoc));
534 /// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
536 Sema::ActOnCXXNullPtrLiteral(SourceLocation Loc) {
537 return Owned(new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc));
540 /// ActOnCXXThrow - Parse throw expressions.
542 Sema::ActOnCXXThrow(Scope *S, SourceLocation OpLoc, Expr *Ex) {
543 bool IsThrownVarInScope = false;
545 // C++0x [class.copymove]p31:
546 // When certain criteria are met, an implementation is allowed to omit the
547 // copy/move construction of a class object [...]
549 // - in a throw-expression, when the operand is the name of a
550 // non-volatile automatic object (other than a function or catch-
551 // clause parameter) whose scope does not extend beyond the end of the
552 // innermost enclosing try-block (if there is one), the copy/move
553 // operation from the operand to the exception object (15.1) can be
554 // omitted by constructing the automatic object directly into the
556 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Ex->IgnoreParens()))
557 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
558 if (Var->hasLocalStorage() && !Var->getType().isVolatileQualified()) {
559 for( ; S; S = S->getParent()) {
560 if (S->isDeclScope(Var)) {
561 IsThrownVarInScope = true;
566 (Scope::FnScope | Scope::ClassScope | Scope::BlockScope |
567 Scope::FunctionPrototypeScope | Scope::ObjCMethodScope |
575 return BuildCXXThrow(OpLoc, Ex, IsThrownVarInScope);
578 ExprResult Sema::BuildCXXThrow(SourceLocation OpLoc, Expr *Ex,
579 bool IsThrownVarInScope) {
580 // Don't report an error if 'throw' is used in system headers.
581 if (!getLangOpts().CXXExceptions &&
582 !getSourceManager().isInSystemHeader(OpLoc))
583 Diag(OpLoc, diag::err_exceptions_disabled) << "throw";
585 if (Ex && !Ex->isTypeDependent()) {
586 ExprResult ExRes = CheckCXXThrowOperand(OpLoc, Ex, IsThrownVarInScope);
587 if (ExRes.isInvalid())
592 return Owned(new (Context) CXXThrowExpr(Ex, Context.VoidTy, OpLoc,
593 IsThrownVarInScope));
596 /// CheckCXXThrowOperand - Validate the operand of a throw.
597 ExprResult Sema::CheckCXXThrowOperand(SourceLocation ThrowLoc, Expr *E,
598 bool IsThrownVarInScope) {
599 // C++ [except.throw]p3:
600 // A throw-expression initializes a temporary object, called the exception
601 // object, the type of which is determined by removing any top-level
602 // cv-qualifiers from the static type of the operand of throw and adjusting
603 // the type from "array of T" or "function returning T" to "pointer to T"
604 // or "pointer to function returning T", [...]
605 if (E->getType().hasQualifiers())
606 E = ImpCastExprToType(E, E->getType().getUnqualifiedType(), CK_NoOp,
607 E->getValueKind()).take();
609 ExprResult Res = DefaultFunctionArrayConversion(E);
614 // If the type of the exception would be an incomplete type or a pointer
615 // to an incomplete type other than (cv) void the program is ill-formed.
616 QualType Ty = E->getType();
617 bool isPointer = false;
618 if (const PointerType* Ptr = Ty->getAs<PointerType>()) {
619 Ty = Ptr->getPointeeType();
622 if (!isPointer || !Ty->isVoidType()) {
623 if (RequireCompleteType(ThrowLoc, Ty,
624 isPointer? diag::err_throw_incomplete_ptr
625 : diag::err_throw_incomplete,
626 E->getSourceRange()))
629 if (RequireNonAbstractType(ThrowLoc, E->getType(),
630 diag::err_throw_abstract_type, E))
634 // Initialize the exception result. This implicitly weeds out
635 // abstract types or types with inaccessible copy constructors.
637 // C++0x [class.copymove]p31:
638 // When certain criteria are met, an implementation is allowed to omit the
639 // copy/move construction of a class object [...]
641 // - in a throw-expression, when the operand is the name of a
642 // non-volatile automatic object (other than a function or catch-clause
643 // parameter) whose scope does not extend beyond the end of the
644 // innermost enclosing try-block (if there is one), the copy/move
645 // operation from the operand to the exception object (15.1) can be
646 // omitted by constructing the automatic object directly into the
648 const VarDecl *NRVOVariable = 0;
649 if (IsThrownVarInScope)
650 NRVOVariable = getCopyElisionCandidate(QualType(), E, false);
652 InitializedEntity Entity =
653 InitializedEntity::InitializeException(ThrowLoc, E->getType(),
654 /*NRVO=*/NRVOVariable != 0);
655 Res = PerformMoveOrCopyInitialization(Entity, NRVOVariable,
662 // If the exception has class type, we need additional handling.
663 const RecordType *RecordTy = Ty->getAs<RecordType>();
666 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl());
668 // If we are throwing a polymorphic class type or pointer thereof,
669 // exception handling will make use of the vtable.
670 MarkVTableUsed(ThrowLoc, RD);
672 // If a pointer is thrown, the referenced object will not be destroyed.
676 // If the class has a destructor, we must be able to call it.
677 if (RD->hasIrrelevantDestructor())
680 CXXDestructorDecl *Destructor = LookupDestructor(RD);
684 MarkFunctionReferenced(E->getExprLoc(), Destructor);
685 CheckDestructorAccess(E->getExprLoc(), Destructor,
686 PDiag(diag::err_access_dtor_exception) << Ty);
687 if (DiagnoseUseOfDecl(Destructor, E->getExprLoc()))
692 QualType Sema::getCurrentThisType() {
693 DeclContext *DC = getFunctionLevelDeclContext();
694 QualType ThisTy = CXXThisTypeOverride;
695 if (CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(DC)) {
696 if (method && method->isInstance())
697 ThisTy = method->getThisType(Context);
703 Sema::CXXThisScopeRAII::CXXThisScopeRAII(Sema &S,
705 unsigned CXXThisTypeQuals,
707 : S(S), OldCXXThisTypeOverride(S.CXXThisTypeOverride), Enabled(false)
709 if (!Enabled || !ContextDecl)
712 CXXRecordDecl *Record = 0;
713 if (ClassTemplateDecl *Template = dyn_cast<ClassTemplateDecl>(ContextDecl))
714 Record = Template->getTemplatedDecl();
716 Record = cast<CXXRecordDecl>(ContextDecl);
718 S.CXXThisTypeOverride
719 = S.Context.getPointerType(
720 S.Context.getRecordType(Record).withCVRQualifiers(CXXThisTypeQuals));
722 this->Enabled = true;
726 Sema::CXXThisScopeRAII::~CXXThisScopeRAII() {
728 S.CXXThisTypeOverride = OldCXXThisTypeOverride;
732 static Expr *captureThis(ASTContext &Context, RecordDecl *RD,
733 QualType ThisTy, SourceLocation Loc) {
735 = FieldDecl::Create(Context, RD, Loc, Loc, 0, ThisTy,
736 Context.getTrivialTypeSourceInfo(ThisTy, Loc),
737 0, false, ICIS_NoInit);
738 Field->setImplicit(true);
739 Field->setAccess(AS_private);
741 return new (Context) CXXThisExpr(Loc, ThisTy, /*isImplicit*/true);
744 void Sema::CheckCXXThisCapture(SourceLocation Loc, bool Explicit) {
745 // We don't need to capture this in an unevaluated context.
746 if (isUnevaluatedContext() && !Explicit)
749 // Otherwise, check that we can capture 'this'.
750 unsigned NumClosures = 0;
751 for (unsigned idx = FunctionScopes.size() - 1; idx != 0; idx--) {
752 if (CapturingScopeInfo *CSI =
753 dyn_cast<CapturingScopeInfo>(FunctionScopes[idx])) {
754 if (CSI->CXXThisCaptureIndex != 0) {
755 // 'this' is already being captured; there isn't anything more to do.
759 if (CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_LambdaByref ||
760 CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_LambdaByval ||
761 CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_Block ||
762 CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_CapturedRegion ||
764 // This closure can capture 'this'; continue looking upwards.
769 // This context can't implicitly capture 'this'; fail out.
770 Diag(Loc, diag::err_this_capture) << Explicit;
776 // Mark that we're implicitly capturing 'this' in all the scopes we skipped.
777 // FIXME: We need to delay this marking in PotentiallyPotentiallyEvaluated
779 for (unsigned idx = FunctionScopes.size() - 1;
780 NumClosures; --idx, --NumClosures) {
781 CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FunctionScopes[idx]);
783 QualType ThisTy = getCurrentThisType();
784 if (LambdaScopeInfo *LSI = dyn_cast<LambdaScopeInfo>(CSI))
785 // For lambda expressions, build a field and an initializing expression.
786 ThisExpr = captureThis(Context, LSI->Lambda, ThisTy, Loc);
787 else if (CapturedRegionScopeInfo *RSI
788 = dyn_cast<CapturedRegionScopeInfo>(FunctionScopes[idx]))
789 ThisExpr = captureThis(Context, RSI->TheRecordDecl, ThisTy, Loc);
791 bool isNested = NumClosures > 1;
792 CSI->addThisCapture(isNested, Loc, ThisTy, ThisExpr);
796 ExprResult Sema::ActOnCXXThis(SourceLocation Loc) {
797 /// C++ 9.3.2: In the body of a non-static member function, the keyword this
798 /// is a non-lvalue expression whose value is the address of the object for
799 /// which the function is called.
801 QualType ThisTy = getCurrentThisType();
802 if (ThisTy.isNull()) return Diag(Loc, diag::err_invalid_this_use);
804 CheckCXXThisCapture(Loc);
805 return Owned(new (Context) CXXThisExpr(Loc, ThisTy, /*isImplicit=*/false));
808 bool Sema::isThisOutsideMemberFunctionBody(QualType BaseType) {
809 // If we're outside the body of a member function, then we'll have a specified
811 if (CXXThisTypeOverride.isNull())
814 // Determine whether we're looking into a class that's currently being
816 CXXRecordDecl *Class = BaseType->getAsCXXRecordDecl();
817 return Class && Class->isBeingDefined();
821 Sema::ActOnCXXTypeConstructExpr(ParsedType TypeRep,
822 SourceLocation LParenLoc,
824 SourceLocation RParenLoc) {
828 TypeSourceInfo *TInfo;
829 QualType Ty = GetTypeFromParser(TypeRep, &TInfo);
831 TInfo = Context.getTrivialTypeSourceInfo(Ty, SourceLocation());
833 return BuildCXXTypeConstructExpr(TInfo, LParenLoc, exprs, RParenLoc);
836 /// ActOnCXXTypeConstructExpr - Parse construction of a specified type.
837 /// Can be interpreted either as function-style casting ("int(x)")
838 /// or class type construction ("ClassType(x,y,z)")
839 /// or creation of a value-initialized type ("int()").
841 Sema::BuildCXXTypeConstructExpr(TypeSourceInfo *TInfo,
842 SourceLocation LParenLoc,
844 SourceLocation RParenLoc) {
845 QualType Ty = TInfo->getType();
846 SourceLocation TyBeginLoc = TInfo->getTypeLoc().getBeginLoc();
848 if (Ty->isDependentType() || CallExpr::hasAnyTypeDependentArguments(Exprs)) {
849 return Owned(CXXUnresolvedConstructExpr::Create(Context, TInfo,
855 bool ListInitialization = LParenLoc.isInvalid();
856 assert((!ListInitialization || (Exprs.size() == 1 && isa<InitListExpr>(Exprs[0])))
857 && "List initialization must have initializer list as expression.");
858 SourceRange FullRange = SourceRange(TyBeginLoc,
859 ListInitialization ? Exprs[0]->getSourceRange().getEnd() : RParenLoc);
861 // C++ [expr.type.conv]p1:
862 // If the expression list is a single expression, the type conversion
863 // expression is equivalent (in definedness, and if defined in meaning) to the
864 // corresponding cast expression.
865 if (Exprs.size() == 1 && !ListInitialization) {
866 Expr *Arg = Exprs[0];
867 return BuildCXXFunctionalCastExpr(TInfo, LParenLoc, Arg, RParenLoc);
870 QualType ElemTy = Ty;
871 if (Ty->isArrayType()) {
872 if (!ListInitialization)
873 return ExprError(Diag(TyBeginLoc,
874 diag::err_value_init_for_array_type) << FullRange);
875 ElemTy = Context.getBaseElementType(Ty);
878 if (!Ty->isVoidType() &&
879 RequireCompleteType(TyBeginLoc, ElemTy,
880 diag::err_invalid_incomplete_type_use, FullRange))
883 if (RequireNonAbstractType(TyBeginLoc, Ty,
884 diag::err_allocation_of_abstract_type))
887 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TInfo);
888 InitializationKind Kind =
889 Exprs.size() ? ListInitialization
890 ? InitializationKind::CreateDirectList(TyBeginLoc)
891 : InitializationKind::CreateDirect(TyBeginLoc, LParenLoc, RParenLoc)
892 : InitializationKind::CreateValue(TyBeginLoc, LParenLoc, RParenLoc);
893 InitializationSequence InitSeq(*this, Entity, Kind, Exprs);
894 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Exprs);
896 if (!Result.isInvalid() && ListInitialization &&
897 isa<InitListExpr>(Result.get())) {
898 // If the list-initialization doesn't involve a constructor call, we'll get
899 // the initializer-list (with corrected type) back, but that's not what we
900 // want, since it will be treated as an initializer list in further
901 // processing. Explicitly insert a cast here.
902 InitListExpr *List = cast<InitListExpr>(Result.take());
903 Result = Owned(CXXFunctionalCastExpr::Create(Context, List->getType(),
904 Expr::getValueKindForType(TInfo->getType()),
905 TInfo, TyBeginLoc, CK_NoOp,
906 List, /*Path=*/0, RParenLoc));
909 // FIXME: Improve AST representation?
913 /// doesUsualArrayDeleteWantSize - Answers whether the usual
914 /// operator delete[] for the given type has a size_t parameter.
915 static bool doesUsualArrayDeleteWantSize(Sema &S, SourceLocation loc,
916 QualType allocType) {
917 const RecordType *record =
918 allocType->getBaseElementTypeUnsafe()->getAs<RecordType>();
919 if (!record) return false;
921 // Try to find an operator delete[] in class scope.
923 DeclarationName deleteName =
924 S.Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete);
925 LookupResult ops(S, deleteName, loc, Sema::LookupOrdinaryName);
926 S.LookupQualifiedName(ops, record->getDecl());
928 // We're just doing this for information.
929 ops.suppressDiagnostics();
931 // Very likely: there's no operator delete[].
932 if (ops.empty()) return false;
934 // If it's ambiguous, it should be illegal to call operator delete[]
935 // on this thing, so it doesn't matter if we allocate extra space or not.
936 if (ops.isAmbiguous()) return false;
938 LookupResult::Filter filter = ops.makeFilter();
939 while (filter.hasNext()) {
940 NamedDecl *del = filter.next()->getUnderlyingDecl();
942 // C++0x [basic.stc.dynamic.deallocation]p2:
943 // A template instance is never a usual deallocation function,
944 // regardless of its signature.
945 if (isa<FunctionTemplateDecl>(del)) {
950 // C++0x [basic.stc.dynamic.deallocation]p2:
951 // If class T does not declare [an operator delete[] with one
952 // parameter] but does declare a member deallocation function
953 // named operator delete[] with exactly two parameters, the
954 // second of which has type std::size_t, then this function
955 // is a usual deallocation function.
956 if (!cast<CXXMethodDecl>(del)->isUsualDeallocationFunction()) {
963 if (!ops.isSingleResult()) return false;
965 const FunctionDecl *del = cast<FunctionDecl>(ops.getFoundDecl());
966 return (del->getNumParams() == 2);
969 /// \brief Parsed a C++ 'new' expression (C++ 5.3.4).
972 /// @code new (memory) int[size][4] @endcode
974 /// @code ::new Foo(23, "hello") @endcode
976 /// \param StartLoc The first location of the expression.
977 /// \param UseGlobal True if 'new' was prefixed with '::'.
978 /// \param PlacementLParen Opening paren of the placement arguments.
979 /// \param PlacementArgs Placement new arguments.
980 /// \param PlacementRParen Closing paren of the placement arguments.
981 /// \param TypeIdParens If the type is in parens, the source range.
982 /// \param D The type to be allocated, as well as array dimensions.
983 /// \param Initializer The initializing expression or initializer-list, or null
984 /// if there is none.
986 Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
987 SourceLocation PlacementLParen, MultiExprArg PlacementArgs,
988 SourceLocation PlacementRParen, SourceRange TypeIdParens,
989 Declarator &D, Expr *Initializer) {
990 bool TypeContainsAuto = D.getDeclSpec().containsPlaceholderType();
993 // If the specified type is an array, unwrap it and save the expression.
994 if (D.getNumTypeObjects() > 0 &&
995 D.getTypeObject(0).Kind == DeclaratorChunk::Array) {
996 DeclaratorChunk &Chunk = D.getTypeObject(0);
997 if (TypeContainsAuto)
998 return ExprError(Diag(Chunk.Loc, diag::err_new_array_of_auto)
999 << D.getSourceRange());
1000 if (Chunk.Arr.hasStatic)
1001 return ExprError(Diag(Chunk.Loc, diag::err_static_illegal_in_new)
1002 << D.getSourceRange());
1003 if (!Chunk.Arr.NumElts)
1004 return ExprError(Diag(Chunk.Loc, diag::err_array_new_needs_size)
1005 << D.getSourceRange());
1007 ArraySize = static_cast<Expr*>(Chunk.Arr.NumElts);
1008 D.DropFirstTypeObject();
1011 // Every dimension shall be of constant size.
1013 for (unsigned I = 0, N = D.getNumTypeObjects(); I < N; ++I) {
1014 if (D.getTypeObject(I).Kind != DeclaratorChunk::Array)
1017 DeclaratorChunk::ArrayTypeInfo &Array = D.getTypeObject(I).Arr;
1018 if (Expr *NumElts = (Expr *)Array.NumElts) {
1019 if (!NumElts->isTypeDependent() && !NumElts->isValueDependent()) {
1021 = VerifyIntegerConstantExpression(NumElts, 0,
1022 diag::err_new_array_nonconst)
1031 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, /*Scope=*/0);
1032 QualType AllocType = TInfo->getType();
1033 if (D.isInvalidType())
1036 SourceRange DirectInitRange;
1037 if (ParenListExpr *List = dyn_cast_or_null<ParenListExpr>(Initializer))
1038 DirectInitRange = List->getSourceRange();
1040 return BuildCXXNew(SourceRange(StartLoc, D.getLocEnd()), UseGlobal,
1053 static bool isLegalArrayNewInitializer(CXXNewExpr::InitializationStyle Style,
1057 if (ParenListExpr *PLE = dyn_cast<ParenListExpr>(Init))
1058 return PLE->getNumExprs() == 0;
1059 if (isa<ImplicitValueInitExpr>(Init))
1061 else if (CXXConstructExpr *CCE = dyn_cast<CXXConstructExpr>(Init))
1062 return !CCE->isListInitialization() &&
1063 CCE->getConstructor()->isDefaultConstructor();
1064 else if (Style == CXXNewExpr::ListInit) {
1065 assert(isa<InitListExpr>(Init) &&
1066 "Shouldn't create list CXXConstructExprs for arrays.");
1073 Sema::BuildCXXNew(SourceRange Range, bool UseGlobal,
1074 SourceLocation PlacementLParen,
1075 MultiExprArg PlacementArgs,
1076 SourceLocation PlacementRParen,
1077 SourceRange TypeIdParens,
1079 TypeSourceInfo *AllocTypeInfo,
1081 SourceRange DirectInitRange,
1083 bool TypeMayContainAuto) {
1084 SourceRange TypeRange = AllocTypeInfo->getTypeLoc().getSourceRange();
1085 SourceLocation StartLoc = Range.getBegin();
1087 CXXNewExpr::InitializationStyle initStyle;
1088 if (DirectInitRange.isValid()) {
1089 assert(Initializer && "Have parens but no initializer.");
1090 initStyle = CXXNewExpr::CallInit;
1091 } else if (Initializer && isa<InitListExpr>(Initializer))
1092 initStyle = CXXNewExpr::ListInit;
1094 assert((!Initializer || isa<ImplicitValueInitExpr>(Initializer) ||
1095 isa<CXXConstructExpr>(Initializer)) &&
1096 "Initializer expression that cannot have been implicitly created.");
1097 initStyle = CXXNewExpr::NoInit;
1100 Expr **Inits = &Initializer;
1101 unsigned NumInits = Initializer ? 1 : 0;
1102 if (ParenListExpr *List = dyn_cast_or_null<ParenListExpr>(Initializer)) {
1103 assert(initStyle == CXXNewExpr::CallInit && "paren init for non-call init");
1104 Inits = List->getExprs();
1105 NumInits = List->getNumExprs();
1108 // Determine whether we've already built the initializer.
1109 bool HaveCompleteInit = false;
1110 if (Initializer && isa<CXXConstructExpr>(Initializer) &&
1111 !isa<CXXTemporaryObjectExpr>(Initializer))
1112 HaveCompleteInit = true;
1113 else if (Initializer && isa<ImplicitValueInitExpr>(Initializer))
1114 HaveCompleteInit = true;
1116 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for.
1117 if (TypeMayContainAuto && AllocType->isUndeducedType()) {
1118 if (initStyle == CXXNewExpr::NoInit || NumInits == 0)
1119 return ExprError(Diag(StartLoc, diag::err_auto_new_requires_ctor_arg)
1120 << AllocType << TypeRange);
1121 if (initStyle == CXXNewExpr::ListInit)
1122 return ExprError(Diag(Inits[0]->getLocStart(),
1123 diag::err_auto_new_requires_parens)
1124 << AllocType << TypeRange);
1126 Expr *FirstBad = Inits[1];
1127 return ExprError(Diag(FirstBad->getLocStart(),
1128 diag::err_auto_new_ctor_multiple_expressions)
1129 << AllocType << TypeRange);
1131 Expr *Deduce = Inits[0];
1132 QualType DeducedType;
1133 if (DeduceAutoType(AllocTypeInfo, Deduce, DeducedType) == DAR_Failed)
1134 return ExprError(Diag(StartLoc, diag::err_auto_new_deduction_failure)
1135 << AllocType << Deduce->getType()
1136 << TypeRange << Deduce->getSourceRange());
1137 if (DeducedType.isNull())
1139 AllocType = DeducedType;
1142 // Per C++0x [expr.new]p5, the type being constructed may be a
1143 // typedef of an array type.
1145 if (const ConstantArrayType *Array
1146 = Context.getAsConstantArrayType(AllocType)) {
1147 ArraySize = IntegerLiteral::Create(Context, Array->getSize(),
1148 Context.getSizeType(),
1149 TypeRange.getEnd());
1150 AllocType = Array->getElementType();
1154 if (CheckAllocatedType(AllocType, TypeRange.getBegin(), TypeRange))
1157 if (initStyle == CXXNewExpr::ListInit && isStdInitializerList(AllocType, 0)) {
1158 Diag(AllocTypeInfo->getTypeLoc().getBeginLoc(),
1159 diag::warn_dangling_std_initializer_list)
1160 << /*at end of FE*/0 << Inits[0]->getSourceRange();
1163 // In ARC, infer 'retaining' for the allocated
1164 if (getLangOpts().ObjCAutoRefCount &&
1165 AllocType.getObjCLifetime() == Qualifiers::OCL_None &&
1166 AllocType->isObjCLifetimeType()) {
1167 AllocType = Context.getLifetimeQualifiedType(AllocType,
1168 AllocType->getObjCARCImplicitLifetime());
1171 QualType ResultType = Context.getPointerType(AllocType);
1173 if (ArraySize && ArraySize->getType()->isNonOverloadPlaceholderType()) {
1174 ExprResult result = CheckPlaceholderExpr(ArraySize);
1175 if (result.isInvalid()) return ExprError();
1176 ArraySize = result.take();
1178 // C++98 5.3.4p6: "The expression in a direct-new-declarator shall have
1179 // integral or enumeration type with a non-negative value."
1180 // C++11 [expr.new]p6: The expression [...] shall be of integral or unscoped
1181 // enumeration type, or a class type for which a single non-explicit
1182 // conversion function to integral or unscoped enumeration type exists.
1183 if (ArraySize && !ArraySize->isTypeDependent()) {
1184 class SizeConvertDiagnoser : public ICEConvertDiagnoser {
1188 SizeConvertDiagnoser(Expr *ArraySize)
1189 : ICEConvertDiagnoser(false, false), ArraySize(ArraySize) { }
1191 virtual DiagnosticBuilder diagnoseNotInt(Sema &S, SourceLocation Loc,
1193 return S.Diag(Loc, diag::err_array_size_not_integral)
1194 << S.getLangOpts().CPlusPlus11 << T;
1197 virtual DiagnosticBuilder diagnoseIncomplete(Sema &S, SourceLocation Loc,
1199 return S.Diag(Loc, diag::err_array_size_incomplete_type)
1200 << T << ArraySize->getSourceRange();
1203 virtual DiagnosticBuilder diagnoseExplicitConv(Sema &S,
1207 return S.Diag(Loc, diag::err_array_size_explicit_conversion) << T << ConvTy;
1210 virtual DiagnosticBuilder noteExplicitConv(Sema &S,
1211 CXXConversionDecl *Conv,
1213 return S.Diag(Conv->getLocation(), diag::note_array_size_conversion)
1214 << ConvTy->isEnumeralType() << ConvTy;
1217 virtual DiagnosticBuilder diagnoseAmbiguous(Sema &S, SourceLocation Loc,
1219 return S.Diag(Loc, diag::err_array_size_ambiguous_conversion) << T;
1222 virtual DiagnosticBuilder noteAmbiguous(Sema &S, CXXConversionDecl *Conv,
1224 return S.Diag(Conv->getLocation(), diag::note_array_size_conversion)
1225 << ConvTy->isEnumeralType() << ConvTy;
1228 virtual DiagnosticBuilder diagnoseConversion(Sema &S, SourceLocation Loc,
1232 S.getLangOpts().CPlusPlus11
1233 ? diag::warn_cxx98_compat_array_size_conversion
1234 : diag::ext_array_size_conversion)
1235 << T << ConvTy->isEnumeralType() << ConvTy;
1237 } SizeDiagnoser(ArraySize);
1239 ExprResult ConvertedSize
1240 = ConvertToIntegralOrEnumerationType(StartLoc, ArraySize, SizeDiagnoser,
1241 /*AllowScopedEnumerations*/ false);
1242 if (ConvertedSize.isInvalid())
1245 ArraySize = ConvertedSize.take();
1246 QualType SizeType = ArraySize->getType();
1247 if (!SizeType->isIntegralOrUnscopedEnumerationType())
1250 // C++98 [expr.new]p7:
1251 // The expression in a direct-new-declarator shall have integral type
1252 // with a non-negative value.
1254 // Let's see if this is a constant < 0. If so, we reject it out of
1255 // hand. Otherwise, if it's not a constant, we must have an unparenthesized
1258 // Note: such a construct has well-defined semantics in C++11: it throws
1259 // std::bad_array_new_length.
1260 if (!ArraySize->isValueDependent()) {
1262 // We've already performed any required implicit conversion to integer or
1263 // unscoped enumeration type.
1264 if (ArraySize->isIntegerConstantExpr(Value, Context)) {
1265 if (Value < llvm::APSInt(
1266 llvm::APInt::getNullValue(Value.getBitWidth()),
1267 Value.isUnsigned())) {
1268 if (getLangOpts().CPlusPlus11)
1269 Diag(ArraySize->getLocStart(),
1270 diag::warn_typecheck_negative_array_new_size)
1271 << ArraySize->getSourceRange();
1273 return ExprError(Diag(ArraySize->getLocStart(),
1274 diag::err_typecheck_negative_array_size)
1275 << ArraySize->getSourceRange());
1276 } else if (!AllocType->isDependentType()) {
1277 unsigned ActiveSizeBits =
1278 ConstantArrayType::getNumAddressingBits(Context, AllocType, Value);
1279 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
1280 if (getLangOpts().CPlusPlus11)
1281 Diag(ArraySize->getLocStart(),
1282 diag::warn_array_new_too_large)
1283 << Value.toString(10)
1284 << ArraySize->getSourceRange();
1286 return ExprError(Diag(ArraySize->getLocStart(),
1287 diag::err_array_too_large)
1288 << Value.toString(10)
1289 << ArraySize->getSourceRange());
1292 } else if (TypeIdParens.isValid()) {
1293 // Can't have dynamic array size when the type-id is in parentheses.
1294 Diag(ArraySize->getLocStart(), diag::ext_new_paren_array_nonconst)
1295 << ArraySize->getSourceRange()
1296 << FixItHint::CreateRemoval(TypeIdParens.getBegin())
1297 << FixItHint::CreateRemoval(TypeIdParens.getEnd());
1299 TypeIdParens = SourceRange();
1303 // Note that we do *not* convert the argument in any way. It can
1304 // be signed, larger than size_t, whatever.
1307 FunctionDecl *OperatorNew = 0;
1308 FunctionDecl *OperatorDelete = 0;
1309 Expr **PlaceArgs = PlacementArgs.data();
1310 unsigned NumPlaceArgs = PlacementArgs.size();
1312 if (!AllocType->isDependentType() &&
1313 !Expr::hasAnyTypeDependentArguments(
1314 llvm::makeArrayRef(PlaceArgs, NumPlaceArgs)) &&
1315 FindAllocationFunctions(StartLoc,
1316 SourceRange(PlacementLParen, PlacementRParen),
1317 UseGlobal, AllocType, ArraySize, PlaceArgs,
1318 NumPlaceArgs, OperatorNew, OperatorDelete))
1321 // If this is an array allocation, compute whether the usual array
1322 // deallocation function for the type has a size_t parameter.
1323 bool UsualArrayDeleteWantsSize = false;
1324 if (ArraySize && !AllocType->isDependentType())
1325 UsualArrayDeleteWantsSize
1326 = doesUsualArrayDeleteWantSize(*this, StartLoc, AllocType);
1328 SmallVector<Expr *, 8> AllPlaceArgs;
1330 // Add default arguments, if any.
1331 const FunctionProtoType *Proto =
1332 OperatorNew->getType()->getAs<FunctionProtoType>();
1333 VariadicCallType CallType =
1334 Proto->isVariadic() ? VariadicFunction : VariadicDoesNotApply;
1336 if (GatherArgumentsForCall(PlacementLParen, OperatorNew,
1337 Proto, 1, PlaceArgs, NumPlaceArgs,
1338 AllPlaceArgs, CallType))
1341 NumPlaceArgs = AllPlaceArgs.size();
1342 if (NumPlaceArgs > 0)
1343 PlaceArgs = &AllPlaceArgs[0];
1345 DiagnoseSentinelCalls(OperatorNew, PlacementLParen,
1346 PlaceArgs, NumPlaceArgs);
1348 // FIXME: Missing call to CheckFunctionCall or equivalent
1351 // Warn if the type is over-aligned and is being allocated by global operator
1353 if (NumPlaceArgs == 0 && OperatorNew &&
1354 (OperatorNew->isImplicit() ||
1355 getSourceManager().isInSystemHeader(OperatorNew->getLocStart()))) {
1356 if (unsigned Align = Context.getPreferredTypeAlign(AllocType.getTypePtr())){
1357 unsigned SuitableAlign = Context.getTargetInfo().getSuitableAlign();
1358 if (Align > SuitableAlign)
1359 Diag(StartLoc, diag::warn_overaligned_type)
1361 << unsigned(Align / Context.getCharWidth())
1362 << unsigned(SuitableAlign / Context.getCharWidth());
1366 QualType InitType = AllocType;
1367 // Array 'new' can't have any initializers except empty parentheses.
1368 // Initializer lists are also allowed, in C++11. Rely on the parser for the
1369 // dialect distinction.
1370 if (ResultType->isArrayType() || ArraySize) {
1371 if (!isLegalArrayNewInitializer(initStyle, Initializer)) {
1372 SourceRange InitRange(Inits[0]->getLocStart(),
1373 Inits[NumInits - 1]->getLocEnd());
1374 Diag(StartLoc, diag::err_new_array_init_args) << InitRange;
1377 if (InitListExpr *ILE = dyn_cast_or_null<InitListExpr>(Initializer)) {
1378 // We do the initialization typechecking against the array type
1379 // corresponding to the number of initializers + 1 (to also check
1380 // default-initialization).
1381 unsigned NumElements = ILE->getNumInits() + 1;
1382 InitType = Context.getConstantArrayType(AllocType,
1383 llvm::APInt(Context.getTypeSize(Context.getSizeType()), NumElements),
1384 ArrayType::Normal, 0);
1388 // If we can perform the initialization, and we've not already done so,
1390 if (!AllocType->isDependentType() &&
1391 !Expr::hasAnyTypeDependentArguments(
1392 llvm::makeArrayRef(Inits, NumInits)) &&
1393 !HaveCompleteInit) {
1394 // C++11 [expr.new]p15:
1395 // A new-expression that creates an object of type T initializes that
1396 // object as follows:
1397 InitializationKind Kind
1398 // - If the new-initializer is omitted, the object is default-
1399 // initialized (8.5); if no initialization is performed,
1400 // the object has indeterminate value
1401 = initStyle == CXXNewExpr::NoInit
1402 ? InitializationKind::CreateDefault(TypeRange.getBegin())
1403 // - Otherwise, the new-initializer is interpreted according to the
1404 // initialization rules of 8.5 for direct-initialization.
1405 : initStyle == CXXNewExpr::ListInit
1406 ? InitializationKind::CreateDirectList(TypeRange.getBegin())
1407 : InitializationKind::CreateDirect(TypeRange.getBegin(),
1408 DirectInitRange.getBegin(),
1409 DirectInitRange.getEnd());
1411 InitializedEntity Entity
1412 = InitializedEntity::InitializeNew(StartLoc, InitType);
1413 InitializationSequence InitSeq(*this, Entity, Kind, MultiExprArg(Inits, NumInits));
1414 ExprResult FullInit = InitSeq.Perform(*this, Entity, Kind,
1415 MultiExprArg(Inits, NumInits));
1416 if (FullInit.isInvalid())
1419 // FullInit is our initializer; strip off CXXBindTemporaryExprs, because
1420 // we don't want the initialized object to be destructed.
1421 if (CXXBindTemporaryExpr *Binder =
1422 dyn_cast_or_null<CXXBindTemporaryExpr>(FullInit.get()))
1423 FullInit = Owned(Binder->getSubExpr());
1425 Initializer = FullInit.take();
1428 // Mark the new and delete operators as referenced.
1430 if (DiagnoseUseOfDecl(OperatorNew, StartLoc))
1432 MarkFunctionReferenced(StartLoc, OperatorNew);
1434 if (OperatorDelete) {
1435 if (DiagnoseUseOfDecl(OperatorDelete, StartLoc))
1437 MarkFunctionReferenced(StartLoc, OperatorDelete);
1440 // C++0x [expr.new]p17:
1441 // If the new expression creates an array of objects of class type,
1442 // access and ambiguity control are done for the destructor.
1443 QualType BaseAllocType = Context.getBaseElementType(AllocType);
1444 if (ArraySize && !BaseAllocType->isDependentType()) {
1445 if (const RecordType *BaseRecordType = BaseAllocType->getAs<RecordType>()) {
1446 if (CXXDestructorDecl *dtor = LookupDestructor(
1447 cast<CXXRecordDecl>(BaseRecordType->getDecl()))) {
1448 MarkFunctionReferenced(StartLoc, dtor);
1449 CheckDestructorAccess(StartLoc, dtor,
1450 PDiag(diag::err_access_dtor)
1452 if (DiagnoseUseOfDecl(dtor, StartLoc))
1458 return Owned(new (Context) CXXNewExpr(Context, UseGlobal, OperatorNew,
1460 UsualArrayDeleteWantsSize,
1461 llvm::makeArrayRef(PlaceArgs, NumPlaceArgs),
1463 ArraySize, initStyle, Initializer,
1464 ResultType, AllocTypeInfo,
1465 Range, DirectInitRange));
1468 /// \brief Checks that a type is suitable as the allocated type
1469 /// in a new-expression.
1470 bool Sema::CheckAllocatedType(QualType AllocType, SourceLocation Loc,
1472 // C++ 5.3.4p1: "[The] type shall be a complete object type, but not an
1473 // abstract class type or array thereof.
1474 if (AllocType->isFunctionType())
1475 return Diag(Loc, diag::err_bad_new_type)
1476 << AllocType << 0 << R;
1477 else if (AllocType->isReferenceType())
1478 return Diag(Loc, diag::err_bad_new_type)
1479 << AllocType << 1 << R;
1480 else if (!AllocType->isDependentType() &&
1481 RequireCompleteType(Loc, AllocType, diag::err_new_incomplete_type,R))
1483 else if (RequireNonAbstractType(Loc, AllocType,
1484 diag::err_allocation_of_abstract_type))
1486 else if (AllocType->isVariablyModifiedType())
1487 return Diag(Loc, diag::err_variably_modified_new_type)
1489 else if (unsigned AddressSpace = AllocType.getAddressSpace())
1490 return Diag(Loc, diag::err_address_space_qualified_new)
1491 << AllocType.getUnqualifiedType() << AddressSpace;
1492 else if (getLangOpts().ObjCAutoRefCount) {
1493 if (const ArrayType *AT = Context.getAsArrayType(AllocType)) {
1494 QualType BaseAllocType = Context.getBaseElementType(AT);
1495 if (BaseAllocType.getObjCLifetime() == Qualifiers::OCL_None &&
1496 BaseAllocType->isObjCLifetimeType())
1497 return Diag(Loc, diag::err_arc_new_array_without_ownership)
1505 /// \brief Determine whether the given function is a non-placement
1506 /// deallocation function.
1507 static bool isNonPlacementDeallocationFunction(FunctionDecl *FD) {
1508 if (FD->isInvalidDecl())
1511 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD))
1512 return Method->isUsualDeallocationFunction();
1514 return ((FD->getOverloadedOperator() == OO_Delete ||
1515 FD->getOverloadedOperator() == OO_Array_Delete) &&
1516 FD->getNumParams() == 1);
1519 /// FindAllocationFunctions - Finds the overloads of operator new and delete
1520 /// that are appropriate for the allocation.
1521 bool Sema::FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
1522 bool UseGlobal, QualType AllocType,
1523 bool IsArray, Expr **PlaceArgs,
1524 unsigned NumPlaceArgs,
1525 FunctionDecl *&OperatorNew,
1526 FunctionDecl *&OperatorDelete) {
1527 // --- Choosing an allocation function ---
1528 // C++ 5.3.4p8 - 14 & 18
1529 // 1) If UseGlobal is true, only look in the global scope. Else, also look
1530 // in the scope of the allocated class.
1531 // 2) If an array size is given, look for operator new[], else look for
1533 // 3) The first argument is always size_t. Append the arguments from the
1536 SmallVector<Expr*, 8> AllocArgs(1 + NumPlaceArgs);
1537 // We don't care about the actual value of this argument.
1538 // FIXME: Should the Sema create the expression and embed it in the syntax
1539 // tree? Or should the consumer just recalculate the value?
1540 IntegerLiteral Size(Context, llvm::APInt::getNullValue(
1541 Context.getTargetInfo().getPointerWidth(0)),
1542 Context.getSizeType(),
1544 AllocArgs[0] = &Size;
1545 std::copy(PlaceArgs, PlaceArgs + NumPlaceArgs, AllocArgs.begin() + 1);
1547 // C++ [expr.new]p8:
1548 // If the allocated type is a non-array type, the allocation
1549 // function's name is operator new and the deallocation function's
1550 // name is operator delete. If the allocated type is an array
1551 // type, the allocation function's name is operator new[] and the
1552 // deallocation function's name is operator delete[].
1553 DeclarationName NewName = Context.DeclarationNames.getCXXOperatorName(
1554 IsArray ? OO_Array_New : OO_New);
1555 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
1556 IsArray ? OO_Array_Delete : OO_Delete);
1558 QualType AllocElemType = Context.getBaseElementType(AllocType);
1560 if (AllocElemType->isRecordType() && !UseGlobal) {
1561 CXXRecordDecl *Record
1562 = cast<CXXRecordDecl>(AllocElemType->getAs<RecordType>()->getDecl());
1563 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0],
1564 AllocArgs.size(), Record, /*AllowMissing=*/true,
1569 // Didn't find a member overload. Look for a global one.
1570 DeclareGlobalNewDelete();
1571 DeclContext *TUDecl = Context.getTranslationUnitDecl();
1572 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0],
1573 AllocArgs.size(), TUDecl, /*AllowMissing=*/false,
1578 // We don't need an operator delete if we're running under
1580 if (!getLangOpts().Exceptions) {
1585 // FindAllocationOverload can change the passed in arguments, so we need to
1587 if (NumPlaceArgs > 0)
1588 std::copy(&AllocArgs[1], AllocArgs.end(), PlaceArgs);
1590 // C++ [expr.new]p19:
1592 // If the new-expression begins with a unary :: operator, the
1593 // deallocation function's name is looked up in the global
1594 // scope. Otherwise, if the allocated type is a class type T or an
1595 // array thereof, the deallocation function's name is looked up in
1596 // the scope of T. If this lookup fails to find the name, or if
1597 // the allocated type is not a class type or array thereof, the
1598 // deallocation function's name is looked up in the global scope.
1599 LookupResult FoundDelete(*this, DeleteName, StartLoc, LookupOrdinaryName);
1600 if (AllocElemType->isRecordType() && !UseGlobal) {
1602 = cast<CXXRecordDecl>(AllocElemType->getAs<RecordType>()->getDecl());
1603 LookupQualifiedName(FoundDelete, RD);
1605 if (FoundDelete.isAmbiguous())
1606 return true; // FIXME: clean up expressions?
1608 if (FoundDelete.empty()) {
1609 DeclareGlobalNewDelete();
1610 LookupQualifiedName(FoundDelete, Context.getTranslationUnitDecl());
1613 FoundDelete.suppressDiagnostics();
1615 SmallVector<std::pair<DeclAccessPair,FunctionDecl*>, 2> Matches;
1617 // Whether we're looking for a placement operator delete is dictated
1618 // by whether we selected a placement operator new, not by whether
1619 // we had explicit placement arguments. This matters for things like
1620 // struct A { void *operator new(size_t, int = 0); ... };
1622 bool isPlacementNew = (NumPlaceArgs > 0 || OperatorNew->param_size() != 1);
1624 if (isPlacementNew) {
1625 // C++ [expr.new]p20:
1626 // A declaration of a placement deallocation function matches the
1627 // declaration of a placement allocation function if it has the
1628 // same number of parameters and, after parameter transformations
1629 // (8.3.5), all parameter types except the first are
1632 // To perform this comparison, we compute the function type that
1633 // the deallocation function should have, and use that type both
1634 // for template argument deduction and for comparison purposes.
1636 // FIXME: this comparison should ignore CC and the like.
1637 QualType ExpectedFunctionType;
1639 const FunctionProtoType *Proto
1640 = OperatorNew->getType()->getAs<FunctionProtoType>();
1642 SmallVector<QualType, 4> ArgTypes;
1643 ArgTypes.push_back(Context.VoidPtrTy);
1644 for (unsigned I = 1, N = Proto->getNumArgs(); I < N; ++I)
1645 ArgTypes.push_back(Proto->getArgType(I));
1647 FunctionProtoType::ExtProtoInfo EPI;
1648 EPI.Variadic = Proto->isVariadic();
1650 ExpectedFunctionType
1651 = Context.getFunctionType(Context.VoidTy, ArgTypes, EPI);
1654 for (LookupResult::iterator D = FoundDelete.begin(),
1655 DEnd = FoundDelete.end();
1657 FunctionDecl *Fn = 0;
1658 if (FunctionTemplateDecl *FnTmpl
1659 = dyn_cast<FunctionTemplateDecl>((*D)->getUnderlyingDecl())) {
1660 // Perform template argument deduction to try to match the
1661 // expected function type.
1662 TemplateDeductionInfo Info(StartLoc);
1663 if (DeduceTemplateArguments(FnTmpl, 0, ExpectedFunctionType, Fn, Info))
1666 Fn = cast<FunctionDecl>((*D)->getUnderlyingDecl());
1668 if (Context.hasSameType(Fn->getType(), ExpectedFunctionType))
1669 Matches.push_back(std::make_pair(D.getPair(), Fn));
1672 // C++ [expr.new]p20:
1673 // [...] Any non-placement deallocation function matches a
1674 // non-placement allocation function. [...]
1675 for (LookupResult::iterator D = FoundDelete.begin(),
1676 DEnd = FoundDelete.end();
1678 if (FunctionDecl *Fn = dyn_cast<FunctionDecl>((*D)->getUnderlyingDecl()))
1679 if (isNonPlacementDeallocationFunction(Fn))
1680 Matches.push_back(std::make_pair(D.getPair(), Fn));
1684 // C++ [expr.new]p20:
1685 // [...] If the lookup finds a single matching deallocation
1686 // function, that function will be called; otherwise, no
1687 // deallocation function will be called.
1688 if (Matches.size() == 1) {
1689 OperatorDelete = Matches[0].second;
1691 // C++0x [expr.new]p20:
1692 // If the lookup finds the two-parameter form of a usual
1693 // deallocation function (3.7.4.2) and that function, considered
1694 // as a placement deallocation function, would have been
1695 // selected as a match for the allocation function, the program
1697 if (NumPlaceArgs && getLangOpts().CPlusPlus11 &&
1698 isNonPlacementDeallocationFunction(OperatorDelete)) {
1699 Diag(StartLoc, diag::err_placement_new_non_placement_delete)
1700 << SourceRange(PlaceArgs[0]->getLocStart(),
1701 PlaceArgs[NumPlaceArgs - 1]->getLocEnd());
1702 Diag(OperatorDelete->getLocation(), diag::note_previous_decl)
1705 CheckAllocationAccess(StartLoc, Range, FoundDelete.getNamingClass(),
1713 /// FindAllocationOverload - Find an fitting overload for the allocation
1714 /// function in the specified scope.
1715 bool Sema::FindAllocationOverload(SourceLocation StartLoc, SourceRange Range,
1716 DeclarationName Name, Expr** Args,
1717 unsigned NumArgs, DeclContext *Ctx,
1718 bool AllowMissing, FunctionDecl *&Operator,
1720 LookupResult R(*this, Name, StartLoc, LookupOrdinaryName);
1721 LookupQualifiedName(R, Ctx);
1723 if (AllowMissing || !Diagnose)
1725 return Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
1729 if (R.isAmbiguous())
1732 R.suppressDiagnostics();
1734 OverloadCandidateSet Candidates(StartLoc);
1735 for (LookupResult::iterator Alloc = R.begin(), AllocEnd = R.end();
1736 Alloc != AllocEnd; ++Alloc) {
1737 // Even member operator new/delete are implicitly treated as
1738 // static, so don't use AddMemberCandidate.
1739 NamedDecl *D = (*Alloc)->getUnderlyingDecl();
1741 if (FunctionTemplateDecl *FnTemplate = dyn_cast<FunctionTemplateDecl>(D)) {
1742 AddTemplateOverloadCandidate(FnTemplate, Alloc.getPair(),
1743 /*ExplicitTemplateArgs=*/0,
1744 llvm::makeArrayRef(Args, NumArgs),
1746 /*SuppressUserConversions=*/false);
1750 FunctionDecl *Fn = cast<FunctionDecl>(D);
1751 AddOverloadCandidate(Fn, Alloc.getPair(),
1752 llvm::makeArrayRef(Args, NumArgs), Candidates,
1753 /*SuppressUserConversions=*/false);
1756 // Do the resolution.
1757 OverloadCandidateSet::iterator Best;
1758 switch (Candidates.BestViableFunction(*this, StartLoc, Best)) {
1761 FunctionDecl *FnDecl = Best->Function;
1762 MarkFunctionReferenced(StartLoc, FnDecl);
1763 // The first argument is size_t, and the first parameter must be size_t,
1764 // too. This is checked on declaration and can be assumed. (It can't be
1765 // asserted on, though, since invalid decls are left in there.)
1766 // Watch out for variadic allocator function.
1767 unsigned NumArgsInFnDecl = FnDecl->getNumParams();
1768 for (unsigned i = 0; (i < NumArgs && i < NumArgsInFnDecl); ++i) {
1769 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
1770 FnDecl->getParamDecl(i));
1772 if (!Diagnose && !CanPerformCopyInitialization(Entity, Owned(Args[i])))
1776 = PerformCopyInitialization(Entity, SourceLocation(), Owned(Args[i]));
1777 if (Result.isInvalid())
1780 Args[i] = Result.takeAs<Expr>();
1785 if (CheckAllocationAccess(StartLoc, Range, R.getNamingClass(),
1786 Best->FoundDecl, Diagnose) == AR_inaccessible)
1792 case OR_No_Viable_Function:
1794 Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
1796 Candidates.NoteCandidates(*this, OCD_AllCandidates,
1797 llvm::makeArrayRef(Args, NumArgs));
1803 Diag(StartLoc, diag::err_ovl_ambiguous_call)
1805 Candidates.NoteCandidates(*this, OCD_ViableCandidates,
1806 llvm::makeArrayRef(Args, NumArgs));
1812 Diag(StartLoc, diag::err_ovl_deleted_call)
1813 << Best->Function->isDeleted()
1815 << getDeletedOrUnavailableSuffix(Best->Function)
1817 Candidates.NoteCandidates(*this, OCD_AllCandidates,
1818 llvm::makeArrayRef(Args, NumArgs));
1823 llvm_unreachable("Unreachable, bad result from BestViableFunction");
1827 /// DeclareGlobalNewDelete - Declare the global forms of operator new and
1828 /// delete. These are:
1831 /// void* operator new(std::size_t) throw(std::bad_alloc);
1832 /// void* operator new[](std::size_t) throw(std::bad_alloc);
1833 /// void operator delete(void *) throw();
1834 /// void operator delete[](void *) throw();
1836 /// void* operator new(std::size_t);
1837 /// void* operator new[](std::size_t);
1838 /// void operator delete(void *);
1839 /// void operator delete[](void *);
1841 /// C++0x operator delete is implicitly noexcept.
1842 /// Note that the placement and nothrow forms of new are *not* implicitly
1843 /// declared. Their use requires including \<new\>.
1844 void Sema::DeclareGlobalNewDelete() {
1845 if (GlobalNewDeleteDeclared)
1848 // C++ [basic.std.dynamic]p2:
1849 // [...] The following allocation and deallocation functions (18.4) are
1850 // implicitly declared in global scope in each translation unit of a
1854 // void* operator new(std::size_t) throw(std::bad_alloc);
1855 // void* operator new[](std::size_t) throw(std::bad_alloc);
1856 // void operator delete(void*) throw();
1857 // void operator delete[](void*) throw();
1859 // void* operator new(std::size_t);
1860 // void* operator new[](std::size_t);
1861 // void operator delete(void*);
1862 // void operator delete[](void*);
1864 // These implicit declarations introduce only the function names operator
1865 // new, operator new[], operator delete, operator delete[].
1867 // Here, we need to refer to std::bad_alloc, so we will implicitly declare
1868 // "std" or "bad_alloc" as necessary to form the exception specification.
1869 // However, we do not make these implicit declarations visible to name
1871 // Note that the C++0x versions of operator delete are deallocation functions,
1872 // and thus are implicitly noexcept.
1873 if (!StdBadAlloc && !getLangOpts().CPlusPlus11) {
1874 // The "std::bad_alloc" class has not yet been declared, so build it
1876 StdBadAlloc = CXXRecordDecl::Create(Context, TTK_Class,
1877 getOrCreateStdNamespace(),
1878 SourceLocation(), SourceLocation(),
1879 &PP.getIdentifierTable().get("bad_alloc"),
1881 getStdBadAlloc()->setImplicit(true);
1884 GlobalNewDeleteDeclared = true;
1886 QualType VoidPtr = Context.getPointerType(Context.VoidTy);
1887 QualType SizeT = Context.getSizeType();
1888 bool AssumeSaneOperatorNew = getLangOpts().AssumeSaneOperatorNew;
1890 DeclareGlobalAllocationFunction(
1891 Context.DeclarationNames.getCXXOperatorName(OO_New),
1892 VoidPtr, SizeT, AssumeSaneOperatorNew);
1893 DeclareGlobalAllocationFunction(
1894 Context.DeclarationNames.getCXXOperatorName(OO_Array_New),
1895 VoidPtr, SizeT, AssumeSaneOperatorNew);
1896 DeclareGlobalAllocationFunction(
1897 Context.DeclarationNames.getCXXOperatorName(OO_Delete),
1898 Context.VoidTy, VoidPtr);
1899 DeclareGlobalAllocationFunction(
1900 Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete),
1901 Context.VoidTy, VoidPtr);
1904 /// DeclareGlobalAllocationFunction - Declares a single implicit global
1905 /// allocation function if it doesn't already exist.
1906 void Sema::DeclareGlobalAllocationFunction(DeclarationName Name,
1907 QualType Return, QualType Argument,
1908 bool AddMallocAttr) {
1909 DeclContext *GlobalCtx = Context.getTranslationUnitDecl();
1911 // Check if this function is already declared.
1913 DeclContext::lookup_result R = GlobalCtx->lookup(Name);
1914 for (DeclContext::lookup_iterator Alloc = R.begin(), AllocEnd = R.end();
1915 Alloc != AllocEnd; ++Alloc) {
1916 // Only look at non-template functions, as it is the predefined,
1917 // non-templated allocation function we are trying to declare here.
1918 if (FunctionDecl *Func = dyn_cast<FunctionDecl>(*Alloc)) {
1919 QualType InitialParamType =
1920 Context.getCanonicalType(
1921 Func->getParamDecl(0)->getType().getUnqualifiedType());
1922 // FIXME: Do we need to check for default arguments here?
1923 if (Func->getNumParams() == 1 && InitialParamType == Argument) {
1924 if(AddMallocAttr && !Func->hasAttr<MallocAttr>())
1925 Func->addAttr(::new (Context) MallocAttr(SourceLocation(), Context));
1932 QualType BadAllocType;
1933 bool HasBadAllocExceptionSpec
1934 = (Name.getCXXOverloadedOperator() == OO_New ||
1935 Name.getCXXOverloadedOperator() == OO_Array_New);
1936 if (HasBadAllocExceptionSpec && !getLangOpts().CPlusPlus11) {
1937 assert(StdBadAlloc && "Must have std::bad_alloc declared");
1938 BadAllocType = Context.getTypeDeclType(getStdBadAlloc());
1941 FunctionProtoType::ExtProtoInfo EPI;
1942 if (HasBadAllocExceptionSpec) {
1943 if (!getLangOpts().CPlusPlus11) {
1944 EPI.ExceptionSpecType = EST_Dynamic;
1945 EPI.NumExceptions = 1;
1946 EPI.Exceptions = &BadAllocType;
1949 EPI.ExceptionSpecType = getLangOpts().CPlusPlus11 ?
1950 EST_BasicNoexcept : EST_DynamicNone;
1953 QualType FnType = Context.getFunctionType(Return, Argument, EPI);
1954 FunctionDecl *Alloc =
1955 FunctionDecl::Create(Context, GlobalCtx, SourceLocation(),
1956 SourceLocation(), Name,
1957 FnType, /*TInfo=*/0, SC_None, false, true);
1958 Alloc->setImplicit();
1961 Alloc->addAttr(::new (Context) MallocAttr(SourceLocation(), Context));
1963 ParmVarDecl *Param = ParmVarDecl::Create(Context, Alloc, SourceLocation(),
1964 SourceLocation(), 0,
1965 Argument, /*TInfo=*/0,
1967 Alloc->setParams(Param);
1969 // FIXME: Also add this declaration to the IdentifierResolver, but
1970 // make sure it is at the end of the chain to coincide with the
1972 Context.getTranslationUnitDecl()->addDecl(Alloc);
1975 bool Sema::FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD,
1976 DeclarationName Name,
1977 FunctionDecl* &Operator, bool Diagnose) {
1978 LookupResult Found(*this, Name, StartLoc, LookupOrdinaryName);
1979 // Try to find operator delete/operator delete[] in class scope.
1980 LookupQualifiedName(Found, RD);
1982 if (Found.isAmbiguous())
1985 Found.suppressDiagnostics();
1987 SmallVector<DeclAccessPair,4> Matches;
1988 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end();
1990 NamedDecl *ND = (*F)->getUnderlyingDecl();
1992 // Ignore template operator delete members from the check for a usual
1993 // deallocation function.
1994 if (isa<FunctionTemplateDecl>(ND))
1997 if (cast<CXXMethodDecl>(ND)->isUsualDeallocationFunction())
1998 Matches.push_back(F.getPair());
2001 // There's exactly one suitable operator; pick it.
2002 if (Matches.size() == 1) {
2003 Operator = cast<CXXMethodDecl>(Matches[0]->getUnderlyingDecl());
2005 if (Operator->isDeleted()) {
2007 Diag(StartLoc, diag::err_deleted_function_use);
2008 NoteDeletedFunction(Operator);
2013 if (CheckAllocationAccess(StartLoc, SourceRange(), Found.getNamingClass(),
2014 Matches[0], Diagnose) == AR_inaccessible)
2019 // We found multiple suitable operators; complain about the ambiguity.
2020 } else if (!Matches.empty()) {
2022 Diag(StartLoc, diag::err_ambiguous_suitable_delete_member_function_found)
2025 for (SmallVectorImpl<DeclAccessPair>::iterator
2026 F = Matches.begin(), FEnd = Matches.end(); F != FEnd; ++F)
2027 Diag((*F)->getUnderlyingDecl()->getLocation(),
2028 diag::note_member_declared_here) << Name;
2033 // We did find operator delete/operator delete[] declarations, but
2034 // none of them were suitable.
2035 if (!Found.empty()) {
2037 Diag(StartLoc, diag::err_no_suitable_delete_member_function_found)
2040 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end();
2042 Diag((*F)->getUnderlyingDecl()->getLocation(),
2043 diag::note_member_declared_here) << Name;
2048 // Look for a global declaration.
2049 DeclareGlobalNewDelete();
2050 DeclContext *TUDecl = Context.getTranslationUnitDecl();
2052 CXXNullPtrLiteralExpr Null(Context.VoidPtrTy, SourceLocation());
2053 Expr* DeallocArgs[1];
2054 DeallocArgs[0] = &Null;
2055 if (FindAllocationOverload(StartLoc, SourceRange(), Name,
2056 DeallocArgs, 1, TUDecl, !Diagnose,
2057 Operator, Diagnose))
2060 assert(Operator && "Did not find a deallocation function!");
2064 /// ActOnCXXDelete - Parsed a C++ 'delete' expression (C++ 5.3.5), as in:
2065 /// @code ::delete ptr; @endcode
2067 /// @code delete [] ptr; @endcode
2069 Sema::ActOnCXXDelete(SourceLocation StartLoc, bool UseGlobal,
2070 bool ArrayForm, Expr *ExE) {
2071 // C++ [expr.delete]p1:
2072 // The operand shall have a pointer type, or a class type having a single
2073 // conversion function to a pointer type. The result has type void.
2075 // DR599 amends "pointer type" to "pointer to object type" in both cases.
2077 ExprResult Ex = Owned(ExE);
2078 FunctionDecl *OperatorDelete = 0;
2079 bool ArrayFormAsWritten = ArrayForm;
2080 bool UsualArrayDeleteWantsSize = false;
2082 if (!Ex.get()->isTypeDependent()) {
2083 // Perform lvalue-to-rvalue cast, if needed.
2084 Ex = DefaultLvalueConversion(Ex.take());
2088 QualType Type = Ex.get()->getType();
2090 if (const RecordType *Record = Type->getAs<RecordType>()) {
2091 if (RequireCompleteType(StartLoc, Type,
2092 diag::err_delete_incomplete_class_type))
2095 SmallVector<CXXConversionDecl*, 4> ObjectPtrConversions;
2097 CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
2098 std::pair<CXXRecordDecl::conversion_iterator,
2099 CXXRecordDecl::conversion_iterator>
2100 Conversions = RD->getVisibleConversionFunctions();
2101 for (CXXRecordDecl::conversion_iterator
2102 I = Conversions.first, E = Conversions.second; I != E; ++I) {
2103 NamedDecl *D = I.getDecl();
2104 if (isa<UsingShadowDecl>(D))
2105 D = cast<UsingShadowDecl>(D)->getTargetDecl();
2107 // Skip over templated conversion functions; they aren't considered.
2108 if (isa<FunctionTemplateDecl>(D))
2111 CXXConversionDecl *Conv = cast<CXXConversionDecl>(D);
2113 QualType ConvType = Conv->getConversionType().getNonReferenceType();
2114 if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>())
2115 if (ConvPtrType->getPointeeType()->isIncompleteOrObjectType())
2116 ObjectPtrConversions.push_back(Conv);
2118 if (ObjectPtrConversions.size() == 1) {
2119 // We have a single conversion to a pointer-to-object type. Perform
2121 // TODO: don't redo the conversion calculation.
2123 PerformImplicitConversion(Ex.get(),
2124 ObjectPtrConversions.front()->getConversionType(),
2126 if (Res.isUsable()) {
2128 Type = Ex.get()->getType();
2131 else if (ObjectPtrConversions.size() > 1) {
2132 Diag(StartLoc, diag::err_ambiguous_delete_operand)
2133 << Type << Ex.get()->getSourceRange();
2134 for (unsigned i= 0; i < ObjectPtrConversions.size(); i++)
2135 NoteOverloadCandidate(ObjectPtrConversions[i]);
2140 if (!Type->isPointerType())
2141 return ExprError(Diag(StartLoc, diag::err_delete_operand)
2142 << Type << Ex.get()->getSourceRange());
2144 QualType Pointee = Type->getAs<PointerType>()->getPointeeType();
2145 QualType PointeeElem = Context.getBaseElementType(Pointee);
2147 if (unsigned AddressSpace = Pointee.getAddressSpace())
2148 return Diag(Ex.get()->getLocStart(),
2149 diag::err_address_space_qualified_delete)
2150 << Pointee.getUnqualifiedType() << AddressSpace;
2152 CXXRecordDecl *PointeeRD = 0;
2153 if (Pointee->isVoidType() && !isSFINAEContext()) {
2154 // The C++ standard bans deleting a pointer to a non-object type, which
2155 // effectively bans deletion of "void*". However, most compilers support
2156 // this, so we treat it as a warning unless we're in a SFINAE context.
2157 Diag(StartLoc, diag::ext_delete_void_ptr_operand)
2158 << Type << Ex.get()->getSourceRange();
2159 } else if (Pointee->isFunctionType() || Pointee->isVoidType()) {
2160 return ExprError(Diag(StartLoc, diag::err_delete_operand)
2161 << Type << Ex.get()->getSourceRange());
2162 } else if (!Pointee->isDependentType()) {
2163 if (!RequireCompleteType(StartLoc, Pointee,
2164 diag::warn_delete_incomplete, Ex.get())) {
2165 if (const RecordType *RT = PointeeElem->getAs<RecordType>())
2166 PointeeRD = cast<CXXRecordDecl>(RT->getDecl());
2170 // C++ [expr.delete]p2:
2171 // [Note: a pointer to a const type can be the operand of a
2172 // delete-expression; it is not necessary to cast away the constness
2173 // (5.2.11) of the pointer expression before it is used as the operand
2174 // of the delete-expression. ]
2176 if (Pointee->isArrayType() && !ArrayForm) {
2177 Diag(StartLoc, diag::warn_delete_array_type)
2178 << Type << Ex.get()->getSourceRange()
2179 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(StartLoc), "[]");
2183 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
2184 ArrayForm ? OO_Array_Delete : OO_Delete);
2188 FindDeallocationFunction(StartLoc, PointeeRD, DeleteName,
2192 // If we're allocating an array of records, check whether the
2193 // usual operator delete[] has a size_t parameter.
2195 // If the user specifically asked to use the global allocator,
2196 // we'll need to do the lookup into the class.
2198 UsualArrayDeleteWantsSize =
2199 doesUsualArrayDeleteWantSize(*this, StartLoc, PointeeElem);
2201 // Otherwise, the usual operator delete[] should be the
2202 // function we just found.
2203 else if (isa<CXXMethodDecl>(OperatorDelete))
2204 UsualArrayDeleteWantsSize = (OperatorDelete->getNumParams() == 2);
2207 if (!PointeeRD->hasIrrelevantDestructor())
2208 if (CXXDestructorDecl *Dtor = LookupDestructor(PointeeRD)) {
2209 MarkFunctionReferenced(StartLoc,
2210 const_cast<CXXDestructorDecl*>(Dtor));
2211 if (DiagnoseUseOfDecl(Dtor, StartLoc))
2215 // C++ [expr.delete]p3:
2216 // In the first alternative (delete object), if the static type of the
2217 // object to be deleted is different from its dynamic type, the static
2218 // type shall be a base class of the dynamic type of the object to be
2219 // deleted and the static type shall have a virtual destructor or the
2220 // behavior is undefined.
2222 // Note: a final class cannot be derived from, no issue there
2223 if (PointeeRD->isPolymorphic() && !PointeeRD->hasAttr<FinalAttr>()) {
2224 CXXDestructorDecl *dtor = PointeeRD->getDestructor();
2225 if (dtor && !dtor->isVirtual()) {
2226 if (PointeeRD->isAbstract()) {
2227 // If the class is abstract, we warn by default, because we're
2228 // sure the code has undefined behavior.
2229 Diag(StartLoc, diag::warn_delete_abstract_non_virtual_dtor)
2231 } else if (!ArrayForm) {
2232 // Otherwise, if this is not an array delete, it's a bit suspect,
2233 // but not necessarily wrong.
2234 Diag(StartLoc, diag::warn_delete_non_virtual_dtor) << PointeeElem;
2241 if (!OperatorDelete) {
2242 // Look for a global declaration.
2243 DeclareGlobalNewDelete();
2244 DeclContext *TUDecl = Context.getTranslationUnitDecl();
2245 Expr *Arg = Ex.get();
2246 if (!Context.hasSameType(Arg->getType(), Context.VoidPtrTy))
2247 Arg = ImplicitCastExpr::Create(Context, Context.VoidPtrTy,
2248 CK_BitCast, Arg, 0, VK_RValue);
2249 if (FindAllocationOverload(StartLoc, SourceRange(), DeleteName,
2250 &Arg, 1, TUDecl, /*AllowMissing=*/false,
2255 MarkFunctionReferenced(StartLoc, OperatorDelete);
2257 // Check access and ambiguity of operator delete and destructor.
2259 if (CXXDestructorDecl *Dtor = LookupDestructor(PointeeRD)) {
2260 CheckDestructorAccess(Ex.get()->getExprLoc(), Dtor,
2261 PDiag(diag::err_access_dtor) << PointeeElem);
2267 return Owned(new (Context) CXXDeleteExpr(Context.VoidTy, UseGlobal, ArrayForm,
2269 UsualArrayDeleteWantsSize,
2270 OperatorDelete, Ex.take(), StartLoc));
2273 /// \brief Check the use of the given variable as a C++ condition in an if,
2274 /// while, do-while, or switch statement.
2275 ExprResult Sema::CheckConditionVariable(VarDecl *ConditionVar,
2276 SourceLocation StmtLoc,
2277 bool ConvertToBoolean) {
2278 if (ConditionVar->isInvalidDecl())
2281 QualType T = ConditionVar->getType();
2283 // C++ [stmt.select]p2:
2284 // The declarator shall not specify a function or an array.
2285 if (T->isFunctionType())
2286 return ExprError(Diag(ConditionVar->getLocation(),
2287 diag::err_invalid_use_of_function_type)
2288 << ConditionVar->getSourceRange());
2289 else if (T->isArrayType())
2290 return ExprError(Diag(ConditionVar->getLocation(),
2291 diag::err_invalid_use_of_array_type)
2292 << ConditionVar->getSourceRange());
2294 ExprResult Condition =
2295 Owned(DeclRefExpr::Create(Context, NestedNameSpecifierLoc(),
2298 /*enclosing*/ false,
2299 ConditionVar->getLocation(),
2300 ConditionVar->getType().getNonReferenceType(),
2303 MarkDeclRefReferenced(cast<DeclRefExpr>(Condition.get()));
2305 if (ConvertToBoolean) {
2306 Condition = CheckBooleanCondition(Condition.take(), StmtLoc);
2307 if (Condition.isInvalid())
2314 /// CheckCXXBooleanCondition - Returns true if a conversion to bool is invalid.
2315 ExprResult Sema::CheckCXXBooleanCondition(Expr *CondExpr) {
2317 // The value of a condition that is an initialized declaration in a statement
2318 // other than a switch statement is the value of the declared variable
2319 // implicitly converted to type bool. If that conversion is ill-formed, the
2320 // program is ill-formed.
2321 // The value of a condition that is an expression is the value of the
2322 // expression, implicitly converted to bool.
2324 return PerformContextuallyConvertToBool(CondExpr);
2327 /// Helper function to determine whether this is the (deprecated) C++
2328 /// conversion from a string literal to a pointer to non-const char or
2329 /// non-const wchar_t (for narrow and wide string literals,
2332 Sema::IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType) {
2333 // Look inside the implicit cast, if it exists.
2334 if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(From))
2335 From = Cast->getSubExpr();
2337 // A string literal (2.13.4) that is not a wide string literal can
2338 // be converted to an rvalue of type "pointer to char"; a wide
2339 // string literal can be converted to an rvalue of type "pointer
2340 // to wchar_t" (C++ 4.2p2).
2341 if (StringLiteral *StrLit = dyn_cast<StringLiteral>(From->IgnoreParens()))
2342 if (const PointerType *ToPtrType = ToType->getAs<PointerType>())
2343 if (const BuiltinType *ToPointeeType
2344 = ToPtrType->getPointeeType()->getAs<BuiltinType>()) {
2345 // This conversion is considered only when there is an
2346 // explicit appropriate pointer target type (C++ 4.2p2).
2347 if (!ToPtrType->getPointeeType().hasQualifiers()) {
2348 switch (StrLit->getKind()) {
2349 case StringLiteral::UTF8:
2350 case StringLiteral::UTF16:
2351 case StringLiteral::UTF32:
2352 // We don't allow UTF literals to be implicitly converted
2354 case StringLiteral::Ascii:
2355 return (ToPointeeType->getKind() == BuiltinType::Char_U ||
2356 ToPointeeType->getKind() == BuiltinType::Char_S);
2357 case StringLiteral::Wide:
2358 return ToPointeeType->isWideCharType();
2366 static ExprResult BuildCXXCastArgument(Sema &S,
2367 SourceLocation CastLoc,
2370 CXXMethodDecl *Method,
2371 DeclAccessPair FoundDecl,
2372 bool HadMultipleCandidates,
2375 default: llvm_unreachable("Unhandled cast kind!");
2376 case CK_ConstructorConversion: {
2377 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Method);
2378 SmallVector<Expr*, 8> ConstructorArgs;
2380 if (S.CompleteConstructorCall(Constructor, From, CastLoc, ConstructorArgs))
2383 S.CheckConstructorAccess(CastLoc, Constructor,
2384 InitializedEntity::InitializeTemporary(Ty),
2385 Constructor->getAccess());
2388 = S.BuildCXXConstructExpr(CastLoc, Ty, cast<CXXConstructorDecl>(Method),
2389 ConstructorArgs, HadMultipleCandidates,
2390 /*ListInit*/ false, /*ZeroInit*/ false,
2391 CXXConstructExpr::CK_Complete, SourceRange());
2392 if (Result.isInvalid())
2395 return S.MaybeBindToTemporary(Result.takeAs<Expr>());
2398 case CK_UserDefinedConversion: {
2399 assert(!From->getType()->isPointerType() && "Arg can't have pointer type!");
2401 // Create an implicit call expr that calls it.
2402 CXXConversionDecl *Conv = cast<CXXConversionDecl>(Method);
2403 ExprResult Result = S.BuildCXXMemberCallExpr(From, FoundDecl, Conv,
2404 HadMultipleCandidates);
2405 if (Result.isInvalid())
2407 // Record usage of conversion in an implicit cast.
2408 Result = S.Owned(ImplicitCastExpr::Create(S.Context,
2409 Result.get()->getType(),
2410 CK_UserDefinedConversion,
2412 Result.get()->getValueKind()));
2414 S.CheckMemberOperatorAccess(CastLoc, From, /*arg*/ 0, FoundDecl);
2416 return S.MaybeBindToTemporary(Result.get());
2421 /// PerformImplicitConversion - Perform an implicit conversion of the
2422 /// expression From to the type ToType using the pre-computed implicit
2423 /// conversion sequence ICS. Returns the converted
2424 /// expression. Action is the kind of conversion we're performing,
2425 /// used in the error message.
2427 Sema::PerformImplicitConversion(Expr *From, QualType ToType,
2428 const ImplicitConversionSequence &ICS,
2429 AssignmentAction Action,
2430 CheckedConversionKind CCK) {
2431 switch (ICS.getKind()) {
2432 case ImplicitConversionSequence::StandardConversion: {
2433 ExprResult Res = PerformImplicitConversion(From, ToType, ICS.Standard,
2435 if (Res.isInvalid())
2441 case ImplicitConversionSequence::UserDefinedConversion: {
2443 FunctionDecl *FD = ICS.UserDefined.ConversionFunction;
2445 QualType BeforeToType;
2446 assert(FD && "FIXME: aggregate initialization from init list");
2447 if (const CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(FD)) {
2448 CastKind = CK_UserDefinedConversion;
2450 // If the user-defined conversion is specified by a conversion function,
2451 // the initial standard conversion sequence converts the source type to
2452 // the implicit object parameter of the conversion function.
2453 BeforeToType = Context.getTagDeclType(Conv->getParent());
2455 const CXXConstructorDecl *Ctor = cast<CXXConstructorDecl>(FD);
2456 CastKind = CK_ConstructorConversion;
2457 // Do no conversion if dealing with ... for the first conversion.
2458 if (!ICS.UserDefined.EllipsisConversion) {
2459 // If the user-defined conversion is specified by a constructor, the
2460 // initial standard conversion sequence converts the source type to the
2461 // type required by the argument of the constructor
2462 BeforeToType = Ctor->getParamDecl(0)->getType().getNonReferenceType();
2465 // Watch out for elipsis conversion.
2466 if (!ICS.UserDefined.EllipsisConversion) {
2468 PerformImplicitConversion(From, BeforeToType,
2469 ICS.UserDefined.Before, AA_Converting,
2471 if (Res.isInvalid())
2477 = BuildCXXCastArgument(*this,
2478 From->getLocStart(),
2479 ToType.getNonReferenceType(),
2480 CastKind, cast<CXXMethodDecl>(FD),
2481 ICS.UserDefined.FoundConversionFunction,
2482 ICS.UserDefined.HadMultipleCandidates,
2485 if (CastArg.isInvalid())
2488 From = CastArg.take();
2490 return PerformImplicitConversion(From, ToType, ICS.UserDefined.After,
2491 AA_Converting, CCK);
2494 case ImplicitConversionSequence::AmbiguousConversion:
2495 ICS.DiagnoseAmbiguousConversion(*this, From->getExprLoc(),
2496 PDiag(diag::err_typecheck_ambiguous_condition)
2497 << From->getSourceRange());
2500 case ImplicitConversionSequence::EllipsisConversion:
2501 llvm_unreachable("Cannot perform an ellipsis conversion");
2503 case ImplicitConversionSequence::BadConversion:
2507 // Everything went well.
2511 /// PerformImplicitConversion - Perform an implicit conversion of the
2512 /// expression From to the type ToType by following the standard
2513 /// conversion sequence SCS. Returns the converted
2514 /// expression. Flavor is the context in which we're performing this
2515 /// conversion, for use in error messages.
2517 Sema::PerformImplicitConversion(Expr *From, QualType ToType,
2518 const StandardConversionSequence& SCS,
2519 AssignmentAction Action,
2520 CheckedConversionKind CCK) {
2521 bool CStyle = (CCK == CCK_CStyleCast || CCK == CCK_FunctionalCast);
2523 // Overall FIXME: we are recomputing too many types here and doing far too
2524 // much extra work. What this means is that we need to keep track of more
2525 // information that is computed when we try the implicit conversion initially,
2526 // so that we don't need to recompute anything here.
2527 QualType FromType = From->getType();
2529 if (SCS.CopyConstructor) {
2530 // FIXME: When can ToType be a reference type?
2531 assert(!ToType->isReferenceType());
2532 if (SCS.Second == ICK_Derived_To_Base) {
2533 SmallVector<Expr*, 8> ConstructorArgs;
2534 if (CompleteConstructorCall(cast<CXXConstructorDecl>(SCS.CopyConstructor),
2535 From, /*FIXME:ConstructLoc*/SourceLocation(),
2538 return BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(),
2539 ToType, SCS.CopyConstructor,
2541 /*HadMultipleCandidates*/ false,
2542 /*ListInit*/ false, /*ZeroInit*/ false,
2543 CXXConstructExpr::CK_Complete,
2546 return BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(),
2547 ToType, SCS.CopyConstructor,
2548 From, /*HadMultipleCandidates*/ false,
2549 /*ListInit*/ false, /*ZeroInit*/ false,
2550 CXXConstructExpr::CK_Complete,
2554 // Resolve overloaded function references.
2555 if (Context.hasSameType(FromType, Context.OverloadTy)) {
2556 DeclAccessPair Found;
2557 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(From, ToType,
2562 if (DiagnoseUseOfDecl(Fn, From->getLocStart()))
2565 From = FixOverloadedFunctionReference(From, Found, Fn);
2566 FromType = From->getType();
2569 // Perform the first implicit conversion.
2570 switch (SCS.First) {
2575 case ICK_Lvalue_To_Rvalue: {
2576 assert(From->getObjectKind() != OK_ObjCProperty);
2577 FromType = FromType.getUnqualifiedType();
2578 ExprResult FromRes = DefaultLvalueConversion(From);
2579 assert(!FromRes.isInvalid() && "Can't perform deduced conversion?!");
2580 From = FromRes.take();
2584 case ICK_Array_To_Pointer:
2585 FromType = Context.getArrayDecayedType(FromType);
2586 From = ImpCastExprToType(From, FromType, CK_ArrayToPointerDecay,
2587 VK_RValue, /*BasePath=*/0, CCK).take();
2590 case ICK_Function_To_Pointer:
2591 FromType = Context.getPointerType(FromType);
2592 From = ImpCastExprToType(From, FromType, CK_FunctionToPointerDecay,
2593 VK_RValue, /*BasePath=*/0, CCK).take();
2597 llvm_unreachable("Improper first standard conversion");
2600 // Perform the second implicit conversion
2601 switch (SCS.Second) {
2603 // If both sides are functions (or pointers/references to them), there could
2604 // be incompatible exception declarations.
2605 if (CheckExceptionSpecCompatibility(From, ToType))
2607 // Nothing else to do.
2610 case ICK_NoReturn_Adjustment:
2611 // If both sides are functions (or pointers/references to them), there could
2612 // be incompatible exception declarations.
2613 if (CheckExceptionSpecCompatibility(From, ToType))
2616 From = ImpCastExprToType(From, ToType, CK_NoOp,
2617 VK_RValue, /*BasePath=*/0, CCK).take();
2620 case ICK_Integral_Promotion:
2621 case ICK_Integral_Conversion:
2622 if (ToType->isBooleanType()) {
2623 assert(FromType->castAs<EnumType>()->getDecl()->isFixed() &&
2624 SCS.Second == ICK_Integral_Promotion &&
2625 "only enums with fixed underlying type can promote to bool");
2626 From = ImpCastExprToType(From, ToType, CK_IntegralToBoolean,
2627 VK_RValue, /*BasePath=*/0, CCK).take();
2629 From = ImpCastExprToType(From, ToType, CK_IntegralCast,
2630 VK_RValue, /*BasePath=*/0, CCK).take();
2634 case ICK_Floating_Promotion:
2635 case ICK_Floating_Conversion:
2636 From = ImpCastExprToType(From, ToType, CK_FloatingCast,
2637 VK_RValue, /*BasePath=*/0, CCK).take();
2640 case ICK_Complex_Promotion:
2641 case ICK_Complex_Conversion: {
2642 QualType FromEl = From->getType()->getAs<ComplexType>()->getElementType();
2643 QualType ToEl = ToType->getAs<ComplexType>()->getElementType();
2645 if (FromEl->isRealFloatingType()) {
2646 if (ToEl->isRealFloatingType())
2647 CK = CK_FloatingComplexCast;
2649 CK = CK_FloatingComplexToIntegralComplex;
2650 } else if (ToEl->isRealFloatingType()) {
2651 CK = CK_IntegralComplexToFloatingComplex;
2653 CK = CK_IntegralComplexCast;
2655 From = ImpCastExprToType(From, ToType, CK,
2656 VK_RValue, /*BasePath=*/0, CCK).take();
2660 case ICK_Floating_Integral:
2661 if (ToType->isRealFloatingType())
2662 From = ImpCastExprToType(From, ToType, CK_IntegralToFloating,
2663 VK_RValue, /*BasePath=*/0, CCK).take();
2665 From = ImpCastExprToType(From, ToType, CK_FloatingToIntegral,
2666 VK_RValue, /*BasePath=*/0, CCK).take();
2669 case ICK_Compatible_Conversion:
2670 From = ImpCastExprToType(From, ToType, CK_NoOp,
2671 VK_RValue, /*BasePath=*/0, CCK).take();
2674 case ICK_Writeback_Conversion:
2675 case ICK_Pointer_Conversion: {
2676 if (SCS.IncompatibleObjC && Action != AA_Casting) {
2677 // Diagnose incompatible Objective-C conversions
2678 if (Action == AA_Initializing || Action == AA_Assigning)
2679 Diag(From->getLocStart(),
2680 diag::ext_typecheck_convert_incompatible_pointer)
2681 << ToType << From->getType() << Action
2682 << From->getSourceRange() << 0;
2684 Diag(From->getLocStart(),
2685 diag::ext_typecheck_convert_incompatible_pointer)
2686 << From->getType() << ToType << Action
2687 << From->getSourceRange() << 0;
2689 if (From->getType()->isObjCObjectPointerType() &&
2690 ToType->isObjCObjectPointerType())
2691 EmitRelatedResultTypeNote(From);
2693 else if (getLangOpts().ObjCAutoRefCount &&
2694 !CheckObjCARCUnavailableWeakConversion(ToType,
2696 if (Action == AA_Initializing)
2697 Diag(From->getLocStart(),
2698 diag::err_arc_weak_unavailable_assign);
2700 Diag(From->getLocStart(),
2701 diag::err_arc_convesion_of_weak_unavailable)
2702 << (Action == AA_Casting) << From->getType() << ToType
2703 << From->getSourceRange();
2706 CastKind Kind = CK_Invalid;
2707 CXXCastPath BasePath;
2708 if (CheckPointerConversion(From, ToType, Kind, BasePath, CStyle))
2711 // Make sure we extend blocks if necessary.
2712 // FIXME: doing this here is really ugly.
2713 if (Kind == CK_BlockPointerToObjCPointerCast) {
2714 ExprResult E = From;
2715 (void) PrepareCastToObjCObjectPointer(E);
2719 From = ImpCastExprToType(From, ToType, Kind, VK_RValue, &BasePath, CCK)
2724 case ICK_Pointer_Member: {
2725 CastKind Kind = CK_Invalid;
2726 CXXCastPath BasePath;
2727 if (CheckMemberPointerConversion(From, ToType, Kind, BasePath, CStyle))
2729 if (CheckExceptionSpecCompatibility(From, ToType))
2731 From = ImpCastExprToType(From, ToType, Kind, VK_RValue, &BasePath, CCK)
2736 case ICK_Boolean_Conversion:
2737 // Perform half-to-boolean conversion via float.
2738 if (From->getType()->isHalfType()) {
2739 From = ImpCastExprToType(From, Context.FloatTy, CK_FloatingCast).take();
2740 FromType = Context.FloatTy;
2743 From = ImpCastExprToType(From, Context.BoolTy,
2744 ScalarTypeToBooleanCastKind(FromType),
2745 VK_RValue, /*BasePath=*/0, CCK).take();
2748 case ICK_Derived_To_Base: {
2749 CXXCastPath BasePath;
2750 if (CheckDerivedToBaseConversion(From->getType(),
2751 ToType.getNonReferenceType(),
2752 From->getLocStart(),
2753 From->getSourceRange(),
2758 From = ImpCastExprToType(From, ToType.getNonReferenceType(),
2759 CK_DerivedToBase, From->getValueKind(),
2760 &BasePath, CCK).take();
2764 case ICK_Vector_Conversion:
2765 From = ImpCastExprToType(From, ToType, CK_BitCast,
2766 VK_RValue, /*BasePath=*/0, CCK).take();
2769 case ICK_Vector_Splat:
2770 From = ImpCastExprToType(From, ToType, CK_VectorSplat,
2771 VK_RValue, /*BasePath=*/0, CCK).take();
2774 case ICK_Complex_Real:
2775 // Case 1. x -> _Complex y
2776 if (const ComplexType *ToComplex = ToType->getAs<ComplexType>()) {
2777 QualType ElType = ToComplex->getElementType();
2778 bool isFloatingComplex = ElType->isRealFloatingType();
2781 if (Context.hasSameUnqualifiedType(ElType, From->getType())) {
2783 } else if (From->getType()->isRealFloatingType()) {
2784 From = ImpCastExprToType(From, ElType,
2785 isFloatingComplex ? CK_FloatingCast : CK_FloatingToIntegral).take();
2787 assert(From->getType()->isIntegerType());
2788 From = ImpCastExprToType(From, ElType,
2789 isFloatingComplex ? CK_IntegralToFloating : CK_IntegralCast).take();
2792 From = ImpCastExprToType(From, ToType,
2793 isFloatingComplex ? CK_FloatingRealToComplex
2794 : CK_IntegralRealToComplex).take();
2796 // Case 2. _Complex x -> y
2798 const ComplexType *FromComplex = From->getType()->getAs<ComplexType>();
2799 assert(FromComplex);
2801 QualType ElType = FromComplex->getElementType();
2802 bool isFloatingComplex = ElType->isRealFloatingType();
2805 From = ImpCastExprToType(From, ElType,
2806 isFloatingComplex ? CK_FloatingComplexToReal
2807 : CK_IntegralComplexToReal,
2808 VK_RValue, /*BasePath=*/0, CCK).take();
2811 if (Context.hasSameUnqualifiedType(ElType, ToType)) {
2813 } else if (ToType->isRealFloatingType()) {
2814 From = ImpCastExprToType(From, ToType,
2815 isFloatingComplex ? CK_FloatingCast : CK_IntegralToFloating,
2816 VK_RValue, /*BasePath=*/0, CCK).take();
2818 assert(ToType->isIntegerType());
2819 From = ImpCastExprToType(From, ToType,
2820 isFloatingComplex ? CK_FloatingToIntegral : CK_IntegralCast,
2821 VK_RValue, /*BasePath=*/0, CCK).take();
2826 case ICK_Block_Pointer_Conversion: {
2827 From = ImpCastExprToType(From, ToType.getUnqualifiedType(), CK_BitCast,
2828 VK_RValue, /*BasePath=*/0, CCK).take();
2832 case ICK_TransparentUnionConversion: {
2833 ExprResult FromRes = Owned(From);
2834 Sema::AssignConvertType ConvTy =
2835 CheckTransparentUnionArgumentConstraints(ToType, FromRes);
2836 if (FromRes.isInvalid())
2838 From = FromRes.take();
2839 assert ((ConvTy == Sema::Compatible) &&
2840 "Improper transparent union conversion");
2845 case ICK_Zero_Event_Conversion:
2846 From = ImpCastExprToType(From, ToType,
2848 From->getValueKind()).take();
2851 case ICK_Lvalue_To_Rvalue:
2852 case ICK_Array_To_Pointer:
2853 case ICK_Function_To_Pointer:
2854 case ICK_Qualification:
2855 case ICK_Num_Conversion_Kinds:
2856 llvm_unreachable("Improper second standard conversion");
2859 switch (SCS.Third) {
2864 case ICK_Qualification: {
2865 // The qualification keeps the category of the inner expression, unless the
2866 // target type isn't a reference.
2867 ExprValueKind VK = ToType->isReferenceType() ?
2868 From->getValueKind() : VK_RValue;
2869 From = ImpCastExprToType(From, ToType.getNonLValueExprType(Context),
2870 CK_NoOp, VK, /*BasePath=*/0, CCK).take();
2872 if (SCS.DeprecatedStringLiteralToCharPtr &&
2873 !getLangOpts().WritableStrings)
2874 Diag(From->getLocStart(), diag::warn_deprecated_string_literal_conversion)
2875 << ToType.getNonReferenceType();
2881 llvm_unreachable("Improper third standard conversion");
2884 // If this conversion sequence involved a scalar -> atomic conversion, perform
2885 // that conversion now.
2886 if (const AtomicType *ToAtomic = ToType->getAs<AtomicType>())
2887 if (Context.hasSameType(ToAtomic->getValueType(), From->getType()))
2888 From = ImpCastExprToType(From, ToType, CK_NonAtomicToAtomic, VK_RValue, 0,
2894 ExprResult Sema::ActOnUnaryTypeTrait(UnaryTypeTrait UTT,
2895 SourceLocation KWLoc,
2897 SourceLocation RParen) {
2898 TypeSourceInfo *TSInfo;
2899 QualType T = GetTypeFromParser(Ty, &TSInfo);
2902 TSInfo = Context.getTrivialTypeSourceInfo(T);
2903 return BuildUnaryTypeTrait(UTT, KWLoc, TSInfo, RParen);
2906 /// \brief Check the completeness of a type in a unary type trait.
2908 /// If the particular type trait requires a complete type, tries to complete
2909 /// it. If completing the type fails, a diagnostic is emitted and false
2910 /// returned. If completing the type succeeds or no completion was required,
2912 static bool CheckUnaryTypeTraitTypeCompleteness(Sema &S,
2916 // C++0x [meta.unary.prop]p3:
2917 // For all of the class templates X declared in this Clause, instantiating
2918 // that template with a template argument that is a class template
2919 // specialization may result in the implicit instantiation of the template
2920 // argument if and only if the semantics of X require that the argument
2921 // must be a complete type.
2922 // We apply this rule to all the type trait expressions used to implement
2923 // these class templates. We also try to follow any GCC documented behavior
2924 // in these expressions to ensure portability of standard libraries.
2926 // is_complete_type somewhat obviously cannot require a complete type.
2927 case UTT_IsCompleteType:
2930 // These traits are modeled on the type predicates in C++0x
2931 // [meta.unary.cat] and [meta.unary.comp]. They are not specified as
2932 // requiring a complete type, as whether or not they return true cannot be
2933 // impacted by the completeness of the type.
2935 case UTT_IsIntegral:
2936 case UTT_IsFloatingPoint:
2939 case UTT_IsLvalueReference:
2940 case UTT_IsRvalueReference:
2941 case UTT_IsMemberFunctionPointer:
2942 case UTT_IsMemberObjectPointer:
2946 case UTT_IsFunction:
2947 case UTT_IsReference:
2948 case UTT_IsArithmetic:
2949 case UTT_IsFundamental:
2952 case UTT_IsCompound:
2953 case UTT_IsMemberPointer:
2956 // These traits are modeled on type predicates in C++0x [meta.unary.prop]
2957 // which requires some of its traits to have the complete type. However,
2958 // the completeness of the type cannot impact these traits' semantics, and
2959 // so they don't require it. This matches the comments on these traits in
2962 case UTT_IsVolatile:
2964 case UTT_IsUnsigned:
2967 // C++0x [meta.unary.prop] Table 49 requires the following traits to be
2968 // applied to a complete type.
2970 case UTT_IsTriviallyCopyable:
2971 case UTT_IsStandardLayout:
2975 case UTT_IsPolymorphic:
2976 case UTT_IsAbstract:
2977 case UTT_IsInterfaceClass:
2980 // These traits require a complete type.
2983 // These trait expressions are designed to help implement predicates in
2984 // [meta.unary.prop] despite not being named the same. They are specified
2985 // by both GCC and the Embarcadero C++ compiler, and require the complete
2986 // type due to the overarching C++0x type predicates being implemented
2987 // requiring the complete type.
2988 case UTT_HasNothrowAssign:
2989 case UTT_HasNothrowMoveAssign:
2990 case UTT_HasNothrowConstructor:
2991 case UTT_HasNothrowCopy:
2992 case UTT_HasTrivialAssign:
2993 case UTT_HasTrivialMoveAssign:
2994 case UTT_HasTrivialDefaultConstructor:
2995 case UTT_HasTrivialMoveConstructor:
2996 case UTT_HasTrivialCopy:
2997 case UTT_HasTrivialDestructor:
2998 case UTT_HasVirtualDestructor:
2999 // Arrays of unknown bound are expressly allowed.
3000 QualType ElTy = ArgTy;
3001 if (ArgTy->isIncompleteArrayType())
3002 ElTy = S.Context.getAsArrayType(ArgTy)->getElementType();
3004 // The void type is expressly allowed.
3005 if (ElTy->isVoidType())
3008 return !S.RequireCompleteType(
3009 Loc, ElTy, diag::err_incomplete_type_used_in_type_trait_expr);
3011 llvm_unreachable("Type trait not handled by switch");
3014 static bool HasNoThrowOperator(const RecordType *RT, OverloadedOperatorKind Op,
3015 Sema &Self, SourceLocation KeyLoc, ASTContext &C,
3016 bool (CXXRecordDecl::*HasTrivial)() const,
3017 bool (CXXRecordDecl::*HasNonTrivial)() const,
3018 bool (CXXMethodDecl::*IsDesiredOp)() const)
3020 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
3021 if ((RD->*HasTrivial)() && !(RD->*HasNonTrivial)())
3024 DeclarationName Name = C.DeclarationNames.getCXXOperatorName(Op);
3025 DeclarationNameInfo NameInfo(Name, KeyLoc);
3026 LookupResult Res(Self, NameInfo, Sema::LookupOrdinaryName);
3027 if (Self.LookupQualifiedName(Res, RD)) {
3028 bool FoundOperator = false;
3029 Res.suppressDiagnostics();
3030 for (LookupResult::iterator Op = Res.begin(), OpEnd = Res.end();
3031 Op != OpEnd; ++Op) {
3032 if (isa<FunctionTemplateDecl>(*Op))
3035 CXXMethodDecl *Operator = cast<CXXMethodDecl>(*Op);
3036 if((Operator->*IsDesiredOp)()) {
3037 FoundOperator = true;
3038 const FunctionProtoType *CPT =
3039 Operator->getType()->getAs<FunctionProtoType>();
3040 CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
3041 if (!CPT || !CPT->isNothrow(Self.Context))
3045 return FoundOperator;
3050 static bool EvaluateUnaryTypeTrait(Sema &Self, UnaryTypeTrait UTT,
3051 SourceLocation KeyLoc, QualType T) {
3052 assert(!T->isDependentType() && "Cannot evaluate traits of dependent type");
3054 ASTContext &C = Self.Context;
3056 // Type trait expressions corresponding to the primary type category
3057 // predicates in C++0x [meta.unary.cat].
3059 return T->isVoidType();
3060 case UTT_IsIntegral:
3061 return T->isIntegralType(C);
3062 case UTT_IsFloatingPoint:
3063 return T->isFloatingType();
3065 return T->isArrayType();
3067 return T->isPointerType();
3068 case UTT_IsLvalueReference:
3069 return T->isLValueReferenceType();
3070 case UTT_IsRvalueReference:
3071 return T->isRValueReferenceType();
3072 case UTT_IsMemberFunctionPointer:
3073 return T->isMemberFunctionPointerType();
3074 case UTT_IsMemberObjectPointer:
3075 return T->isMemberDataPointerType();
3077 return T->isEnumeralType();
3079 return T->isUnionType();
3081 return T->isClassType() || T->isStructureType() || T->isInterfaceType();
3082 case UTT_IsFunction:
3083 return T->isFunctionType();
3085 // Type trait expressions which correspond to the convenient composition
3086 // predicates in C++0x [meta.unary.comp].
3087 case UTT_IsReference:
3088 return T->isReferenceType();
3089 case UTT_IsArithmetic:
3090 return T->isArithmeticType() && !T->isEnumeralType();
3091 case UTT_IsFundamental:
3092 return T->isFundamentalType();
3094 return T->isObjectType();
3096 // Note: semantic analysis depends on Objective-C lifetime types to be
3097 // considered scalar types. However, such types do not actually behave
3098 // like scalar types at run time (since they may require retain/release
3099 // operations), so we report them as non-scalar.
3100 if (T->isObjCLifetimeType()) {
3101 switch (T.getObjCLifetime()) {
3102 case Qualifiers::OCL_None:
3103 case Qualifiers::OCL_ExplicitNone:
3106 case Qualifiers::OCL_Strong:
3107 case Qualifiers::OCL_Weak:
3108 case Qualifiers::OCL_Autoreleasing:
3113 return T->isScalarType();
3114 case UTT_IsCompound:
3115 return T->isCompoundType();
3116 case UTT_IsMemberPointer:
3117 return T->isMemberPointerType();
3119 // Type trait expressions which correspond to the type property predicates
3120 // in C++0x [meta.unary.prop].
3122 return T.isConstQualified();
3123 case UTT_IsVolatile:
3124 return T.isVolatileQualified();
3126 return T.isTrivialType(Self.Context);
3127 case UTT_IsTriviallyCopyable:
3128 return T.isTriviallyCopyableType(Self.Context);
3129 case UTT_IsStandardLayout:
3130 return T->isStandardLayoutType();
3132 return T.isPODType(Self.Context);
3134 return T->isLiteralType(Self.Context);
3136 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3137 return !RD->isUnion() && RD->isEmpty();
3139 case UTT_IsPolymorphic:
3140 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3141 return RD->isPolymorphic();
3143 case UTT_IsAbstract:
3144 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3145 return RD->isAbstract();
3147 case UTT_IsInterfaceClass:
3148 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3149 return RD->isInterface();
3152 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3153 return RD->hasAttr<FinalAttr>();
3156 return T->isSignedIntegerType();
3157 case UTT_IsUnsigned:
3158 return T->isUnsignedIntegerType();
3160 // Type trait expressions which query classes regarding their construction,
3161 // destruction, and copying. Rather than being based directly on the
3162 // related type predicates in the standard, they are specified by both
3163 // GCC[1] and the Embarcadero C++ compiler[2], and Clang implements those
3166 // 1: http://gcc.gnu/.org/onlinedocs/gcc/Type-Traits.html
3167 // 2: http://docwiki.embarcadero.com/RADStudio/XE/en/Type_Trait_Functions_(C%2B%2B0x)_Index
3169 // Note that these builtins do not behave as documented in g++: if a class
3170 // has both a trivial and a non-trivial special member of a particular kind,
3171 // they return false! For now, we emulate this behavior.
3172 // FIXME: This appears to be a g++ bug: more complex cases reveal that it
3173 // does not correctly compute triviality in the presence of multiple special
3174 // members of the same kind. Revisit this once the g++ bug is fixed.
3175 case UTT_HasTrivialDefaultConstructor:
3176 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
3177 // If __is_pod (type) is true then the trait is true, else if type is
3178 // a cv class or union type (or array thereof) with a trivial default
3179 // constructor ([class.ctor]) then the trait is true, else it is false.
3180 if (T.isPODType(Self.Context))
3182 if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
3183 return RD->hasTrivialDefaultConstructor() &&
3184 !RD->hasNonTrivialDefaultConstructor();
3186 case UTT_HasTrivialMoveConstructor:
3187 // This trait is implemented by MSVC 2012 and needed to parse the
3188 // standard library headers. Specifically this is used as the logic
3189 // behind std::is_trivially_move_constructible (20.9.4.3).
3190 if (T.isPODType(Self.Context))
3192 if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
3193 return RD->hasTrivialMoveConstructor() && !RD->hasNonTrivialMoveConstructor();
3195 case UTT_HasTrivialCopy:
3196 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
3197 // If __is_pod (type) is true or type is a reference type then
3198 // the trait is true, else if type is a cv class or union type
3199 // with a trivial copy constructor ([class.copy]) then the trait
3200 // is true, else it is false.
3201 if (T.isPODType(Self.Context) || T->isReferenceType())
3203 if (CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3204 return RD->hasTrivialCopyConstructor() &&
3205 !RD->hasNonTrivialCopyConstructor();
3207 case UTT_HasTrivialMoveAssign:
3208 // This trait is implemented by MSVC 2012 and needed to parse the
3209 // standard library headers. Specifically it is used as the logic
3210 // behind std::is_trivially_move_assignable (20.9.4.3)
3211 if (T.isPODType(Self.Context))
3213 if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
3214 return RD->hasTrivialMoveAssignment() && !RD->hasNonTrivialMoveAssignment();
3216 case UTT_HasTrivialAssign:
3217 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
3218 // If type is const qualified or is a reference type then the
3219 // trait is false. Otherwise if __is_pod (type) is true then the
3220 // trait is true, else if type is a cv class or union type with
3221 // a trivial copy assignment ([class.copy]) then the trait is
3222 // true, else it is false.
3223 // Note: the const and reference restrictions are interesting,
3224 // given that const and reference members don't prevent a class
3225 // from having a trivial copy assignment operator (but do cause
3226 // errors if the copy assignment operator is actually used, q.v.
3227 // [class.copy]p12).
3229 if (T.isConstQualified())
3231 if (T.isPODType(Self.Context))
3233 if (CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3234 return RD->hasTrivialCopyAssignment() &&
3235 !RD->hasNonTrivialCopyAssignment();
3237 case UTT_HasTrivialDestructor:
3238 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
3239 // If __is_pod (type) is true or type is a reference type
3240 // then the trait is true, else if type is a cv class or union
3241 // type (or array thereof) with a trivial destructor
3242 // ([class.dtor]) then the trait is true, else it is
3244 if (T.isPODType(Self.Context) || T->isReferenceType())
3247 // Objective-C++ ARC: autorelease types don't require destruction.
3248 if (T->isObjCLifetimeType() &&
3249 T.getObjCLifetime() == Qualifiers::OCL_Autoreleasing)
3252 if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
3253 return RD->hasTrivialDestructor();
3255 // TODO: Propagate nothrowness for implicitly declared special members.
3256 case UTT_HasNothrowAssign:
3257 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
3258 // If type is const qualified or is a reference type then the
3259 // trait is false. Otherwise if __has_trivial_assign (type)
3260 // is true then the trait is true, else if type is a cv class
3261 // or union type with copy assignment operators that are known
3262 // not to throw an exception then the trait is true, else it is
3264 if (C.getBaseElementType(T).isConstQualified())
3266 if (T->isReferenceType())
3268 if (T.isPODType(Self.Context) || T->isObjCLifetimeType())
3271 if (const RecordType *RT = T->getAs<RecordType>())
3272 return HasNoThrowOperator(RT, OO_Equal, Self, KeyLoc, C,
3273 &CXXRecordDecl::hasTrivialCopyAssignment,
3274 &CXXRecordDecl::hasNonTrivialCopyAssignment,
3275 &CXXMethodDecl::isCopyAssignmentOperator);
3277 case UTT_HasNothrowMoveAssign:
3278 // This trait is implemented by MSVC 2012 and needed to parse the
3279 // standard library headers. Specifically this is used as the logic
3280 // behind std::is_nothrow_move_assignable (20.9.4.3).
3281 if (T.isPODType(Self.Context))
3284 if (const RecordType *RT = C.getBaseElementType(T)->getAs<RecordType>())
3285 return HasNoThrowOperator(RT, OO_Equal, Self, KeyLoc, C,
3286 &CXXRecordDecl::hasTrivialMoveAssignment,
3287 &CXXRecordDecl::hasNonTrivialMoveAssignment,
3288 &CXXMethodDecl::isMoveAssignmentOperator);
3290 case UTT_HasNothrowCopy:
3291 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
3292 // If __has_trivial_copy (type) is true then the trait is true, else
3293 // if type is a cv class or union type with copy constructors that are
3294 // known not to throw an exception then the trait is true, else it is
3296 if (T.isPODType(C) || T->isReferenceType() || T->isObjCLifetimeType())
3298 if (CXXRecordDecl *RD = T->getAsCXXRecordDecl()) {
3299 if (RD->hasTrivialCopyConstructor() &&
3300 !RD->hasNonTrivialCopyConstructor())
3303 bool FoundConstructor = false;
3305 DeclContext::lookup_const_result R = Self.LookupConstructors(RD);
3306 for (DeclContext::lookup_const_iterator Con = R.begin(),
3307 ConEnd = R.end(); Con != ConEnd; ++Con) {
3308 // A template constructor is never a copy constructor.
3309 // FIXME: However, it may actually be selected at the actual overload
3310 // resolution point.
3311 if (isa<FunctionTemplateDecl>(*Con))
3313 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con);
3314 if (Constructor->isCopyConstructor(FoundTQs)) {
3315 FoundConstructor = true;
3316 const FunctionProtoType *CPT
3317 = Constructor->getType()->getAs<FunctionProtoType>();
3318 CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
3321 // FIXME: check whether evaluating default arguments can throw.
3322 // For now, we'll be conservative and assume that they can throw.
3323 if (!CPT->isNothrow(Self.Context) || CPT->getNumArgs() > 1)
3328 return FoundConstructor;
3331 case UTT_HasNothrowConstructor:
3332 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
3333 // If __has_trivial_constructor (type) is true then the trait is
3334 // true, else if type is a cv class or union type (or array
3335 // thereof) with a default constructor that is known not to
3336 // throw an exception then the trait is true, else it is false.
3337 if (T.isPODType(C) || T->isObjCLifetimeType())
3339 if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl()) {
3340 if (RD->hasTrivialDefaultConstructor() &&
3341 !RD->hasNonTrivialDefaultConstructor())
3344 DeclContext::lookup_const_result R = Self.LookupConstructors(RD);
3345 for (DeclContext::lookup_const_iterator Con = R.begin(),
3346 ConEnd = R.end(); Con != ConEnd; ++Con) {
3347 // FIXME: In C++0x, a constructor template can be a default constructor.
3348 if (isa<FunctionTemplateDecl>(*Con))
3350 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con);
3351 if (Constructor->isDefaultConstructor()) {
3352 const FunctionProtoType *CPT
3353 = Constructor->getType()->getAs<FunctionProtoType>();
3354 CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
3357 // TODO: check whether evaluating default arguments can throw.
3358 // For now, we'll be conservative and assume that they can throw.
3359 return CPT->isNothrow(Self.Context) && CPT->getNumArgs() == 0;
3364 case UTT_HasVirtualDestructor:
3365 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
3366 // If type is a class type with a virtual destructor ([class.dtor])
3367 // then the trait is true, else it is false.
3368 if (CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3369 if (CXXDestructorDecl *Destructor = Self.LookupDestructor(RD))
3370 return Destructor->isVirtual();
3373 // These type trait expressions are modeled on the specifications for the
3374 // Embarcadero C++0x type trait functions:
3375 // http://docwiki.embarcadero.com/RADStudio/XE/en/Type_Trait_Functions_(C%2B%2B0x)_Index
3376 case UTT_IsCompleteType:
3377 // http://docwiki.embarcadero.com/RADStudio/XE/en/Is_complete_type_(typename_T_):
3378 // Returns True if and only if T is a complete type at the point of the
3380 return !T->isIncompleteType();
3382 llvm_unreachable("Type trait not covered by switch");
3385 ExprResult Sema::BuildUnaryTypeTrait(UnaryTypeTrait UTT,
3386 SourceLocation KWLoc,
3387 TypeSourceInfo *TSInfo,
3388 SourceLocation RParen) {
3389 QualType T = TSInfo->getType();
3390 if (!CheckUnaryTypeTraitTypeCompleteness(*this, UTT, KWLoc, T))
3394 if (!T->isDependentType())
3395 Value = EvaluateUnaryTypeTrait(*this, UTT, KWLoc, T);
3397 return Owned(new (Context) UnaryTypeTraitExpr(KWLoc, UTT, TSInfo, Value,
3398 RParen, Context.BoolTy));
3401 ExprResult Sema::ActOnBinaryTypeTrait(BinaryTypeTrait BTT,
3402 SourceLocation KWLoc,
3405 SourceLocation RParen) {
3406 TypeSourceInfo *LhsTSInfo;
3407 QualType LhsT = GetTypeFromParser(LhsTy, &LhsTSInfo);
3409 LhsTSInfo = Context.getTrivialTypeSourceInfo(LhsT);
3411 TypeSourceInfo *RhsTSInfo;
3412 QualType RhsT = GetTypeFromParser(RhsTy, &RhsTSInfo);
3414 RhsTSInfo = Context.getTrivialTypeSourceInfo(RhsT);
3416 return BuildBinaryTypeTrait(BTT, KWLoc, LhsTSInfo, RhsTSInfo, RParen);
3419 /// \brief Determine whether T has a non-trivial Objective-C lifetime in
3421 static bool hasNontrivialObjCLifetime(QualType T) {
3422 switch (T.getObjCLifetime()) {
3423 case Qualifiers::OCL_ExplicitNone:
3426 case Qualifiers::OCL_Strong:
3427 case Qualifiers::OCL_Weak:
3428 case Qualifiers::OCL_Autoreleasing:
3431 case Qualifiers::OCL_None:
3432 return T->isObjCLifetimeType();
3435 llvm_unreachable("Unknown ObjC lifetime qualifier");
3438 static bool evaluateTypeTrait(Sema &S, TypeTrait Kind, SourceLocation KWLoc,
3439 ArrayRef<TypeSourceInfo *> Args,
3440 SourceLocation RParenLoc) {
3442 case clang::TT_IsTriviallyConstructible: {
3443 // C++11 [meta.unary.prop]:
3444 // is_trivially_constructible is defined as:
3446 // is_constructible<T, Args...>::value is true and the variable
3447 // definition for is_constructible, as defined below, is known to call no
3448 // operation that is not trivial.
3450 // The predicate condition for a template specialization
3451 // is_constructible<T, Args...> shall be satisfied if and only if the
3452 // following variable definition would be well-formed for some invented
3455 // T t(create<Args>()...);
3457 S.Diag(KWLoc, diag::err_type_trait_arity)
3458 << 1 << 1 << 1 << (int)Args.size();
3462 bool SawVoid = false;
3463 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
3464 if (Args[I]->getType()->isVoidType()) {
3469 if (!Args[I]->getType()->isIncompleteType() &&
3470 S.RequireCompleteType(KWLoc, Args[I]->getType(),
3471 diag::err_incomplete_type_used_in_type_trait_expr))
3475 // If any argument was 'void', of course it won't type-check.
3479 SmallVector<OpaqueValueExpr, 2> OpaqueArgExprs;
3480 SmallVector<Expr *, 2> ArgExprs;
3481 ArgExprs.reserve(Args.size() - 1);
3482 for (unsigned I = 1, N = Args.size(); I != N; ++I) {
3483 QualType T = Args[I]->getType();
3484 if (T->isObjectType() || T->isFunctionType())
3485 T = S.Context.getRValueReferenceType(T);
3486 OpaqueArgExprs.push_back(
3487 OpaqueValueExpr(Args[I]->getTypeLoc().getLocStart(),
3488 T.getNonLValueExprType(S.Context),
3489 Expr::getValueKindForType(T)));
3490 ArgExprs.push_back(&OpaqueArgExprs.back());
3493 // Perform the initialization in an unevaluated context within a SFINAE
3494 // trap at translation unit scope.
3495 EnterExpressionEvaluationContext Unevaluated(S, Sema::Unevaluated);
3496 Sema::SFINAETrap SFINAE(S, /*AccessCheckingSFINAE=*/true);
3497 Sema::ContextRAII TUContext(S, S.Context.getTranslationUnitDecl());
3498 InitializedEntity To(InitializedEntity::InitializeTemporary(Args[0]));
3499 InitializationKind InitKind(InitializationKind::CreateDirect(KWLoc, KWLoc,
3501 InitializationSequence Init(S, To, InitKind, ArgExprs);
3505 ExprResult Result = Init.Perform(S, To, InitKind, ArgExprs);
3506 if (Result.isInvalid() || SFINAE.hasErrorOccurred())
3509 // Under Objective-C ARC, if the destination has non-trivial Objective-C
3510 // lifetime, this is a non-trivial construction.
3511 if (S.getLangOpts().ObjCAutoRefCount &&
3512 hasNontrivialObjCLifetime(Args[0]->getType().getNonReferenceType()))
3515 // The initialization succeeded; now make sure there are no non-trivial
3517 return !Result.get()->hasNonTrivialCall(S.Context);
3524 ExprResult Sema::BuildTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
3525 ArrayRef<TypeSourceInfo *> Args,
3526 SourceLocation RParenLoc) {
3527 bool Dependent = false;
3528 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
3529 if (Args[I]->getType()->isDependentType()) {
3537 Value = evaluateTypeTrait(*this, Kind, KWLoc, Args, RParenLoc);
3539 return TypeTraitExpr::Create(Context, Context.BoolTy, KWLoc, Kind,
3540 Args, RParenLoc, Value);
3543 ExprResult Sema::ActOnTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
3544 ArrayRef<ParsedType> Args,
3545 SourceLocation RParenLoc) {
3546 SmallVector<TypeSourceInfo *, 4> ConvertedArgs;
3547 ConvertedArgs.reserve(Args.size());
3549 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
3550 TypeSourceInfo *TInfo;
3551 QualType T = GetTypeFromParser(Args[I], &TInfo);
3553 TInfo = Context.getTrivialTypeSourceInfo(T, KWLoc);
3555 ConvertedArgs.push_back(TInfo);
3558 return BuildTypeTrait(Kind, KWLoc, ConvertedArgs, RParenLoc);
3561 static bool EvaluateBinaryTypeTrait(Sema &Self, BinaryTypeTrait BTT,
3562 QualType LhsT, QualType RhsT,
3563 SourceLocation KeyLoc) {
3564 assert(!LhsT->isDependentType() && !RhsT->isDependentType() &&
3565 "Cannot evaluate traits of dependent types");
3568 case BTT_IsBaseOf: {
3569 // C++0x [meta.rel]p2
3570 // Base is a base class of Derived without regard to cv-qualifiers or
3571 // Base and Derived are not unions and name the same class type without
3572 // regard to cv-qualifiers.
3574 const RecordType *lhsRecord = LhsT->getAs<RecordType>();
3575 if (!lhsRecord) return false;
3577 const RecordType *rhsRecord = RhsT->getAs<RecordType>();
3578 if (!rhsRecord) return false;
3580 assert(Self.Context.hasSameUnqualifiedType(LhsT, RhsT)
3581 == (lhsRecord == rhsRecord));
3583 if (lhsRecord == rhsRecord)
3584 return !lhsRecord->getDecl()->isUnion();
3586 // C++0x [meta.rel]p2:
3587 // If Base and Derived are class types and are different types
3588 // (ignoring possible cv-qualifiers) then Derived shall be a
3590 if (Self.RequireCompleteType(KeyLoc, RhsT,
3591 diag::err_incomplete_type_used_in_type_trait_expr))
3594 return cast<CXXRecordDecl>(rhsRecord->getDecl())
3595 ->isDerivedFrom(cast<CXXRecordDecl>(lhsRecord->getDecl()));
3598 return Self.Context.hasSameType(LhsT, RhsT);
3599 case BTT_TypeCompatible:
3600 return Self.Context.typesAreCompatible(LhsT.getUnqualifiedType(),
3601 RhsT.getUnqualifiedType());
3602 case BTT_IsConvertible:
3603 case BTT_IsConvertibleTo: {
3604 // C++0x [meta.rel]p4:
3605 // Given the following function prototype:
3607 // template <class T>
3608 // typename add_rvalue_reference<T>::type create();
3610 // the predicate condition for a template specialization
3611 // is_convertible<From, To> shall be satisfied if and only if
3612 // the return expression in the following code would be
3613 // well-formed, including any implicit conversions to the return
3614 // type of the function:
3617 // return create<From>();
3620 // Access checking is performed as if in a context unrelated to To and
3621 // From. Only the validity of the immediate context of the expression
3622 // of the return-statement (including conversions to the return type)
3625 // We model the initialization as a copy-initialization of a temporary
3626 // of the appropriate type, which for this expression is identical to the
3627 // return statement (since NRVO doesn't apply).
3629 // Functions aren't allowed to return function or array types.
3630 if (RhsT->isFunctionType() || RhsT->isArrayType())
3633 // A return statement in a void function must have void type.
3634 if (RhsT->isVoidType())
3635 return LhsT->isVoidType();
3637 // A function definition requires a complete, non-abstract return type.
3638 if (Self.RequireCompleteType(KeyLoc, RhsT, 0) ||
3639 Self.RequireNonAbstractType(KeyLoc, RhsT, 0))
3642 // Compute the result of add_rvalue_reference.
3643 if (LhsT->isObjectType() || LhsT->isFunctionType())
3644 LhsT = Self.Context.getRValueReferenceType(LhsT);
3646 // Build a fake source and destination for initialization.
3647 InitializedEntity To(InitializedEntity::InitializeTemporary(RhsT));
3648 OpaqueValueExpr From(KeyLoc, LhsT.getNonLValueExprType(Self.Context),
3649 Expr::getValueKindForType(LhsT));
3650 Expr *FromPtr = &From;
3651 InitializationKind Kind(InitializationKind::CreateCopy(KeyLoc,
3654 // Perform the initialization in an unevaluated context within a SFINAE
3655 // trap at translation unit scope.
3656 EnterExpressionEvaluationContext Unevaluated(Self, Sema::Unevaluated);
3657 Sema::SFINAETrap SFINAE(Self, /*AccessCheckingSFINAE=*/true);
3658 Sema::ContextRAII TUContext(Self, Self.Context.getTranslationUnitDecl());
3659 InitializationSequence Init(Self, To, Kind, FromPtr);
3663 ExprResult Result = Init.Perform(Self, To, Kind, FromPtr);
3664 return !Result.isInvalid() && !SFINAE.hasErrorOccurred();
3667 case BTT_IsTriviallyAssignable: {
3668 // C++11 [meta.unary.prop]p3:
3669 // is_trivially_assignable is defined as:
3670 // is_assignable<T, U>::value is true and the assignment, as defined by
3671 // is_assignable, is known to call no operation that is not trivial
3673 // is_assignable is defined as:
3674 // The expression declval<T>() = declval<U>() is well-formed when
3675 // treated as an unevaluated operand (Clause 5).
3677 // For both, T and U shall be complete types, (possibly cv-qualified)
3678 // void, or arrays of unknown bound.
3679 if (!LhsT->isVoidType() && !LhsT->isIncompleteArrayType() &&
3680 Self.RequireCompleteType(KeyLoc, LhsT,
3681 diag::err_incomplete_type_used_in_type_trait_expr))
3683 if (!RhsT->isVoidType() && !RhsT->isIncompleteArrayType() &&
3684 Self.RequireCompleteType(KeyLoc, RhsT,
3685 diag::err_incomplete_type_used_in_type_trait_expr))
3688 // cv void is never assignable.
3689 if (LhsT->isVoidType() || RhsT->isVoidType())
3692 // Build expressions that emulate the effect of declval<T>() and
3694 if (LhsT->isObjectType() || LhsT->isFunctionType())
3695 LhsT = Self.Context.getRValueReferenceType(LhsT);
3696 if (RhsT->isObjectType() || RhsT->isFunctionType())
3697 RhsT = Self.Context.getRValueReferenceType(RhsT);
3698 OpaqueValueExpr Lhs(KeyLoc, LhsT.getNonLValueExprType(Self.Context),
3699 Expr::getValueKindForType(LhsT));
3700 OpaqueValueExpr Rhs(KeyLoc, RhsT.getNonLValueExprType(Self.Context),
3701 Expr::getValueKindForType(RhsT));
3703 // Attempt the assignment in an unevaluated context within a SFINAE
3704 // trap at translation unit scope.
3705 EnterExpressionEvaluationContext Unevaluated(Self, Sema::Unevaluated);
3706 Sema::SFINAETrap SFINAE(Self, /*AccessCheckingSFINAE=*/true);
3707 Sema::ContextRAII TUContext(Self, Self.Context.getTranslationUnitDecl());
3708 ExprResult Result = Self.BuildBinOp(/*S=*/0, KeyLoc, BO_Assign, &Lhs, &Rhs);
3709 if (Result.isInvalid() || SFINAE.hasErrorOccurred())
3712 // Under Objective-C ARC, if the destination has non-trivial Objective-C
3713 // lifetime, this is a non-trivial assignment.
3714 if (Self.getLangOpts().ObjCAutoRefCount &&
3715 hasNontrivialObjCLifetime(LhsT.getNonReferenceType()))
3718 return !Result.get()->hasNonTrivialCall(Self.Context);
3721 llvm_unreachable("Unknown type trait or not implemented");
3724 ExprResult Sema::BuildBinaryTypeTrait(BinaryTypeTrait BTT,
3725 SourceLocation KWLoc,
3726 TypeSourceInfo *LhsTSInfo,
3727 TypeSourceInfo *RhsTSInfo,
3728 SourceLocation RParen) {
3729 QualType LhsT = LhsTSInfo->getType();
3730 QualType RhsT = RhsTSInfo->getType();
3732 if (BTT == BTT_TypeCompatible) {
3733 if (getLangOpts().CPlusPlus) {
3734 Diag(KWLoc, diag::err_types_compatible_p_in_cplusplus)
3735 << SourceRange(KWLoc, RParen);
3741 if (!LhsT->isDependentType() && !RhsT->isDependentType())
3742 Value = EvaluateBinaryTypeTrait(*this, BTT, LhsT, RhsT, KWLoc);
3744 // Select trait result type.
3745 QualType ResultType;
3747 case BTT_IsBaseOf: ResultType = Context.BoolTy; break;
3748 case BTT_IsConvertible: ResultType = Context.BoolTy; break;
3749 case BTT_IsSame: ResultType = Context.BoolTy; break;
3750 case BTT_TypeCompatible: ResultType = Context.IntTy; break;
3751 case BTT_IsConvertibleTo: ResultType = Context.BoolTy; break;
3752 case BTT_IsTriviallyAssignable: ResultType = Context.BoolTy;
3755 return Owned(new (Context) BinaryTypeTraitExpr(KWLoc, BTT, LhsTSInfo,
3756 RhsTSInfo, Value, RParen,
3760 ExprResult Sema::ActOnArrayTypeTrait(ArrayTypeTrait ATT,
3761 SourceLocation KWLoc,
3764 SourceLocation RParen) {
3765 TypeSourceInfo *TSInfo;
3766 QualType T = GetTypeFromParser(Ty, &TSInfo);
3768 TSInfo = Context.getTrivialTypeSourceInfo(T);
3770 return BuildArrayTypeTrait(ATT, KWLoc, TSInfo, DimExpr, RParen);
3773 static uint64_t EvaluateArrayTypeTrait(Sema &Self, ArrayTypeTrait ATT,
3774 QualType T, Expr *DimExpr,
3775 SourceLocation KeyLoc) {
3776 assert(!T->isDependentType() && "Cannot evaluate traits of dependent type");
3780 if (T->isArrayType()) {
3782 while (const ArrayType *AT = Self.Context.getAsArrayType(T)) {
3784 T = AT->getElementType();
3790 case ATT_ArrayExtent: {
3793 if (Self.VerifyIntegerConstantExpression(DimExpr, &Value,
3794 diag::err_dimension_expr_not_constant_integer,
3797 if (Value.isSigned() && Value.isNegative()) {
3798 Self.Diag(KeyLoc, diag::err_dimension_expr_not_constant_integer)
3799 << DimExpr->getSourceRange();
3802 Dim = Value.getLimitedValue();
3804 if (T->isArrayType()) {
3806 bool Matched = false;
3807 while (const ArrayType *AT = Self.Context.getAsArrayType(T)) {
3813 T = AT->getElementType();
3816 if (Matched && T->isArrayType()) {
3817 if (const ConstantArrayType *CAT = Self.Context.getAsConstantArrayType(T))
3818 return CAT->getSize().getLimitedValue();
3824 llvm_unreachable("Unknown type trait or not implemented");
3827 ExprResult Sema::BuildArrayTypeTrait(ArrayTypeTrait ATT,
3828 SourceLocation KWLoc,
3829 TypeSourceInfo *TSInfo,
3831 SourceLocation RParen) {
3832 QualType T = TSInfo->getType();
3834 // FIXME: This should likely be tracked as an APInt to remove any host
3835 // assumptions about the width of size_t on the target.
3837 if (!T->isDependentType())
3838 Value = EvaluateArrayTypeTrait(*this, ATT, T, DimExpr, KWLoc);
3840 // While the specification for these traits from the Embarcadero C++
3841 // compiler's documentation says the return type is 'unsigned int', Clang
3842 // returns 'size_t'. On Windows, the primary platform for the Embarcadero
3843 // compiler, there is no difference. On several other platforms this is an
3844 // important distinction.
3845 return Owned(new (Context) ArrayTypeTraitExpr(KWLoc, ATT, TSInfo, Value,
3847 Context.getSizeType()));
3850 ExprResult Sema::ActOnExpressionTrait(ExpressionTrait ET,
3851 SourceLocation KWLoc,
3853 SourceLocation RParen) {
3854 // If error parsing the expression, ignore.
3858 ExprResult Result = BuildExpressionTrait(ET, KWLoc, Queried, RParen);
3863 static bool EvaluateExpressionTrait(ExpressionTrait ET, Expr *E) {
3865 case ET_IsLValueExpr: return E->isLValue();
3866 case ET_IsRValueExpr: return E->isRValue();
3868 llvm_unreachable("Expression trait not covered by switch");
3871 ExprResult Sema::BuildExpressionTrait(ExpressionTrait ET,
3872 SourceLocation KWLoc,
3874 SourceLocation RParen) {
3875 if (Queried->isTypeDependent()) {
3876 // Delay type-checking for type-dependent expressions.
3877 } else if (Queried->getType()->isPlaceholderType()) {
3878 ExprResult PE = CheckPlaceholderExpr(Queried);
3879 if (PE.isInvalid()) return ExprError();
3880 return BuildExpressionTrait(ET, KWLoc, PE.take(), RParen);
3883 bool Value = EvaluateExpressionTrait(ET, Queried);
3885 return Owned(new (Context) ExpressionTraitExpr(KWLoc, ET, Queried, Value,
3886 RParen, Context.BoolTy));
3889 QualType Sema::CheckPointerToMemberOperands(ExprResult &LHS, ExprResult &RHS,
3893 assert(!LHS.get()->getType()->isPlaceholderType() &&
3894 !RHS.get()->getType()->isPlaceholderType() &&
3895 "placeholders should have been weeded out by now");
3897 // The LHS undergoes lvalue conversions if this is ->*.
3899 LHS = DefaultLvalueConversion(LHS.take());
3900 if (LHS.isInvalid()) return QualType();
3903 // The RHS always undergoes lvalue conversions.
3904 RHS = DefaultLvalueConversion(RHS.take());
3905 if (RHS.isInvalid()) return QualType();
3907 const char *OpSpelling = isIndirect ? "->*" : ".*";
3909 // The binary operator .* [p3: ->*] binds its second operand, which shall
3910 // be of type "pointer to member of T" (where T is a completely-defined
3911 // class type) [...]
3912 QualType RHSType = RHS.get()->getType();
3913 const MemberPointerType *MemPtr = RHSType->getAs<MemberPointerType>();
3915 Diag(Loc, diag::err_bad_memptr_rhs)
3916 << OpSpelling << RHSType << RHS.get()->getSourceRange();
3920 QualType Class(MemPtr->getClass(), 0);
3922 // Note: C++ [expr.mptr.oper]p2-3 says that the class type into which the
3923 // member pointer points must be completely-defined. However, there is no
3924 // reason for this semantic distinction, and the rule is not enforced by
3925 // other compilers. Therefore, we do not check this property, as it is
3926 // likely to be considered a defect.
3929 // [...] to its first operand, which shall be of class T or of a class of
3930 // which T is an unambiguous and accessible base class. [p3: a pointer to
3932 QualType LHSType = LHS.get()->getType();
3934 if (const PointerType *Ptr = LHSType->getAs<PointerType>())
3935 LHSType = Ptr->getPointeeType();
3937 Diag(Loc, diag::err_bad_memptr_lhs)
3938 << OpSpelling << 1 << LHSType
3939 << FixItHint::CreateReplacement(SourceRange(Loc), ".*");
3944 if (!Context.hasSameUnqualifiedType(Class, LHSType)) {
3945 // If we want to check the hierarchy, we need a complete type.
3946 if (RequireCompleteType(Loc, LHSType, diag::err_bad_memptr_lhs,
3947 OpSpelling, (int)isIndirect)) {
3950 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
3951 /*DetectVirtual=*/false);
3952 // FIXME: Would it be useful to print full ambiguity paths, or is that
3954 if (!IsDerivedFrom(LHSType, Class, Paths) ||
3955 Paths.isAmbiguous(Context.getCanonicalType(Class))) {
3956 Diag(Loc, diag::err_bad_memptr_lhs) << OpSpelling
3957 << (int)isIndirect << LHS.get()->getType();
3960 // Cast LHS to type of use.
3961 QualType UseType = isIndirect ? Context.getPointerType(Class) : Class;
3962 ExprValueKind VK = isIndirect ? VK_RValue : LHS.get()->getValueKind();
3964 CXXCastPath BasePath;
3965 BuildBasePathArray(Paths, BasePath);
3966 LHS = ImpCastExprToType(LHS.take(), UseType, CK_DerivedToBase, VK,
3970 if (isa<CXXScalarValueInitExpr>(RHS.get()->IgnoreParens())) {
3971 // Diagnose use of pointer-to-member type which when used as
3972 // the functional cast in a pointer-to-member expression.
3973 Diag(Loc, diag::err_pointer_to_member_type) << isIndirect;
3978 // The result is an object or a function of the type specified by the
3980 // The cv qualifiers are the union of those in the pointer and the left side,
3981 // in accordance with 5.5p5 and 5.2.5.
3982 QualType Result = MemPtr->getPointeeType();
3983 Result = Context.getCVRQualifiedType(Result, LHSType.getCVRQualifiers());
3985 // C++0x [expr.mptr.oper]p6:
3986 // In a .* expression whose object expression is an rvalue, the program is
3987 // ill-formed if the second operand is a pointer to member function with
3988 // ref-qualifier &. In a ->* expression or in a .* expression whose object
3989 // expression is an lvalue, the program is ill-formed if the second operand
3990 // is a pointer to member function with ref-qualifier &&.
3991 if (const FunctionProtoType *Proto = Result->getAs<FunctionProtoType>()) {
3992 switch (Proto->getRefQualifier()) {
3998 if (!isIndirect && !LHS.get()->Classify(Context).isLValue())
3999 Diag(Loc, diag::err_pointer_to_member_oper_value_classify)
4000 << RHSType << 1 << LHS.get()->getSourceRange();
4004 if (isIndirect || !LHS.get()->Classify(Context).isRValue())
4005 Diag(Loc, diag::err_pointer_to_member_oper_value_classify)
4006 << RHSType << 0 << LHS.get()->getSourceRange();
4011 // C++ [expr.mptr.oper]p6:
4012 // The result of a .* expression whose second operand is a pointer
4013 // to a data member is of the same value category as its
4014 // first operand. The result of a .* expression whose second
4015 // operand is a pointer to a member function is a prvalue. The
4016 // result of an ->* expression is an lvalue if its second operand
4017 // is a pointer to data member and a prvalue otherwise.
4018 if (Result->isFunctionType()) {
4020 return Context.BoundMemberTy;
4021 } else if (isIndirect) {
4024 VK = LHS.get()->getValueKind();
4030 /// \brief Try to convert a type to another according to C++0x 5.16p3.
4032 /// This is part of the parameter validation for the ? operator. If either
4033 /// value operand is a class type, the two operands are attempted to be
4034 /// converted to each other. This function does the conversion in one direction.
4035 /// It returns true if the program is ill-formed and has already been diagnosed
4037 static bool TryClassUnification(Sema &Self, Expr *From, Expr *To,
4038 SourceLocation QuestionLoc,
4039 bool &HaveConversion,
4041 HaveConversion = false;
4042 ToType = To->getType();
4044 InitializationKind Kind = InitializationKind::CreateCopy(To->getLocStart(),
4047 // The process for determining whether an operand expression E1 of type T1
4048 // can be converted to match an operand expression E2 of type T2 is defined
4050 // -- If E2 is an lvalue:
4051 bool ToIsLvalue = To->isLValue();
4053 // E1 can be converted to match E2 if E1 can be implicitly converted to
4054 // type "lvalue reference to T2", subject to the constraint that in the
4055 // conversion the reference must bind directly to E1.
4056 QualType T = Self.Context.getLValueReferenceType(ToType);
4057 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T);
4059 InitializationSequence InitSeq(Self, Entity, Kind, From);
4060 if (InitSeq.isDirectReferenceBinding()) {
4062 HaveConversion = true;
4066 if (InitSeq.isAmbiguous())
4067 return InitSeq.Diagnose(Self, Entity, Kind, From);
4070 // -- If E2 is an rvalue, or if the conversion above cannot be done:
4071 // -- if E1 and E2 have class type, and the underlying class types are
4072 // the same or one is a base class of the other:
4073 QualType FTy = From->getType();
4074 QualType TTy = To->getType();
4075 const RecordType *FRec = FTy->getAs<RecordType>();
4076 const RecordType *TRec = TTy->getAs<RecordType>();
4077 bool FDerivedFromT = FRec && TRec && FRec != TRec &&
4078 Self.IsDerivedFrom(FTy, TTy);
4080 (FRec == TRec || FDerivedFromT || Self.IsDerivedFrom(TTy, FTy))) {
4081 // E1 can be converted to match E2 if the class of T2 is the
4082 // same type as, or a base class of, the class of T1, and
4084 if (FRec == TRec || FDerivedFromT) {
4085 if (TTy.isAtLeastAsQualifiedAs(FTy)) {
4086 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy);
4087 InitializationSequence InitSeq(Self, Entity, Kind, From);
4089 HaveConversion = true;
4093 if (InitSeq.isAmbiguous())
4094 return InitSeq.Diagnose(Self, Entity, Kind, From);
4101 // -- Otherwise: E1 can be converted to match E2 if E1 can be
4102 // implicitly converted to the type that expression E2 would have
4103 // if E2 were converted to an rvalue (or the type it has, if E2 is
4106 // This actually refers very narrowly to the lvalue-to-rvalue conversion, not
4107 // to the array-to-pointer or function-to-pointer conversions.
4108 if (!TTy->getAs<TagType>())
4109 TTy = TTy.getUnqualifiedType();
4111 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy);
4112 InitializationSequence InitSeq(Self, Entity, Kind, From);
4113 HaveConversion = !InitSeq.Failed();
4115 if (InitSeq.isAmbiguous())
4116 return InitSeq.Diagnose(Self, Entity, Kind, From);
4121 /// \brief Try to find a common type for two according to C++0x 5.16p5.
4123 /// This is part of the parameter validation for the ? operator. If either
4124 /// value operand is a class type, overload resolution is used to find a
4125 /// conversion to a common type.
4126 static bool FindConditionalOverload(Sema &Self, ExprResult &LHS, ExprResult &RHS,
4127 SourceLocation QuestionLoc) {
4128 Expr *Args[2] = { LHS.get(), RHS.get() };
4129 OverloadCandidateSet CandidateSet(QuestionLoc);
4130 Self.AddBuiltinOperatorCandidates(OO_Conditional, QuestionLoc, Args,
4133 OverloadCandidateSet::iterator Best;
4134 switch (CandidateSet.BestViableFunction(Self, QuestionLoc, Best)) {
4136 // We found a match. Perform the conversions on the arguments and move on.
4138 Self.PerformImplicitConversion(LHS.get(), Best->BuiltinTypes.ParamTypes[0],
4139 Best->Conversions[0], Sema::AA_Converting);
4140 if (LHSRes.isInvalid())
4145 Self.PerformImplicitConversion(RHS.get(), Best->BuiltinTypes.ParamTypes[1],
4146 Best->Conversions[1], Sema::AA_Converting);
4147 if (RHSRes.isInvalid())
4151 Self.MarkFunctionReferenced(QuestionLoc, Best->Function);
4155 case OR_No_Viable_Function:
4157 // Emit a better diagnostic if one of the expressions is a null pointer
4158 // constant and the other is a pointer type. In this case, the user most
4159 // likely forgot to take the address of the other expression.
4160 if (Self.DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
4163 Self.Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
4164 << LHS.get()->getType() << RHS.get()->getType()
4165 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
4169 Self.Diag(QuestionLoc, diag::err_conditional_ambiguous_ovl)
4170 << LHS.get()->getType() << RHS.get()->getType()
4171 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
4172 // FIXME: Print the possible common types by printing the return types of
4173 // the viable candidates.
4177 llvm_unreachable("Conditional operator has only built-in overloads");
4182 /// \brief Perform an "extended" implicit conversion as returned by
4183 /// TryClassUnification.
4184 static bool ConvertForConditional(Sema &Self, ExprResult &E, QualType T) {
4185 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T);
4186 InitializationKind Kind = InitializationKind::CreateCopy(E.get()->getLocStart(),
4188 Expr *Arg = E.take();
4189 InitializationSequence InitSeq(Self, Entity, Kind, Arg);
4190 ExprResult Result = InitSeq.Perform(Self, Entity, Kind, Arg);
4191 if (Result.isInvalid())
4198 /// \brief Check the operands of ?: under C++ semantics.
4200 /// See C++ [expr.cond]. Note that LHS is never null, even for the GNU x ?: y
4201 /// extension. In this case, LHS == Cond. (But they're not aliases.)
4202 QualType Sema::CXXCheckConditionalOperands(ExprResult &Cond, ExprResult &LHS,
4203 ExprResult &RHS, ExprValueKind &VK,
4205 SourceLocation QuestionLoc) {
4206 // FIXME: Handle C99's complex types, vector types, block pointers and Obj-C++
4207 // interface pointers.
4209 // C++11 [expr.cond]p1
4210 // The first expression is contextually converted to bool.
4211 if (!Cond.get()->isTypeDependent()) {
4212 ExprResult CondRes = CheckCXXBooleanCondition(Cond.take());
4213 if (CondRes.isInvalid())
4222 // Either of the arguments dependent?
4223 if (LHS.get()->isTypeDependent() || RHS.get()->isTypeDependent())
4224 return Context.DependentTy;
4226 // C++11 [expr.cond]p2
4227 // If either the second or the third operand has type (cv) void, ...
4228 QualType LTy = LHS.get()->getType();
4229 QualType RTy = RHS.get()->getType();
4230 bool LVoid = LTy->isVoidType();
4231 bool RVoid = RTy->isVoidType();
4232 if (LVoid || RVoid) {
4233 // ... then the [l2r] conversions are performed on the second and third
4235 LHS = DefaultFunctionArrayLvalueConversion(LHS.take());
4236 RHS = DefaultFunctionArrayLvalueConversion(RHS.take());
4237 if (LHS.isInvalid() || RHS.isInvalid())
4240 // Finish off the lvalue-to-rvalue conversion by copy-initializing a
4241 // temporary if necessary. DefaultFunctionArrayLvalueConversion doesn't
4242 // do this part for us.
4243 ExprResult &NonVoid = LVoid ? RHS : LHS;
4244 if (NonVoid.get()->getType()->isRecordType() &&
4245 NonVoid.get()->isGLValue()) {
4246 if (RequireNonAbstractType(QuestionLoc, NonVoid.get()->getType(),
4247 diag::err_allocation_of_abstract_type))
4249 InitializedEntity Entity =
4250 InitializedEntity::InitializeTemporary(NonVoid.get()->getType());
4251 NonVoid = PerformCopyInitialization(Entity, SourceLocation(), NonVoid);
4252 if (NonVoid.isInvalid())
4256 LTy = LHS.get()->getType();
4257 RTy = RHS.get()->getType();
4259 // ... and one of the following shall hold:
4260 // -- The second or the third operand (but not both) is a throw-
4261 // expression; the result is of the type of the other and is a prvalue.
4262 bool LThrow = isa<CXXThrowExpr>(LHS.get());
4263 bool RThrow = isa<CXXThrowExpr>(RHS.get());
4264 if (LThrow && !RThrow)
4266 if (RThrow && !LThrow)
4269 // -- Both the second and third operands have type void; the result is of
4270 // type void and is a prvalue.
4272 return Context.VoidTy;
4274 // Neither holds, error.
4275 Diag(QuestionLoc, diag::err_conditional_void_nonvoid)
4276 << (LVoid ? RTy : LTy) << (LVoid ? 0 : 1)
4277 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
4283 // C++11 [expr.cond]p3
4284 // Otherwise, if the second and third operand have different types, and
4285 // either has (cv) class type [...] an attempt is made to convert each of
4286 // those operands to the type of the other.
4287 if (!Context.hasSameType(LTy, RTy) &&
4288 (LTy->isRecordType() || RTy->isRecordType())) {
4289 ImplicitConversionSequence ICSLeftToRight, ICSRightToLeft;
4290 // These return true if a single direction is already ambiguous.
4291 QualType L2RType, R2LType;
4292 bool HaveL2R, HaveR2L;
4293 if (TryClassUnification(*this, LHS.get(), RHS.get(), QuestionLoc, HaveL2R, L2RType))
4295 if (TryClassUnification(*this, RHS.get(), LHS.get(), QuestionLoc, HaveR2L, R2LType))
4298 // If both can be converted, [...] the program is ill-formed.
4299 if (HaveL2R && HaveR2L) {
4300 Diag(QuestionLoc, diag::err_conditional_ambiguous)
4301 << LTy << RTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
4305 // If exactly one conversion is possible, that conversion is applied to
4306 // the chosen operand and the converted operands are used in place of the
4307 // original operands for the remainder of this section.
4309 if (ConvertForConditional(*this, LHS, L2RType) || LHS.isInvalid())
4311 LTy = LHS.get()->getType();
4312 } else if (HaveR2L) {
4313 if (ConvertForConditional(*this, RHS, R2LType) || RHS.isInvalid())
4315 RTy = RHS.get()->getType();
4319 // C++11 [expr.cond]p3
4320 // if both are glvalues of the same value category and the same type except
4321 // for cv-qualification, an attempt is made to convert each of those
4322 // operands to the type of the other.
4323 ExprValueKind LVK = LHS.get()->getValueKind();
4324 ExprValueKind RVK = RHS.get()->getValueKind();
4325 if (!Context.hasSameType(LTy, RTy) &&
4326 Context.hasSameUnqualifiedType(LTy, RTy) &&
4327 LVK == RVK && LVK != VK_RValue) {
4328 // Since the unqualified types are reference-related and we require the
4329 // result to be as if a reference bound directly, the only conversion
4330 // we can perform is to add cv-qualifiers.
4331 Qualifiers LCVR = Qualifiers::fromCVRMask(LTy.getCVRQualifiers());
4332 Qualifiers RCVR = Qualifiers::fromCVRMask(RTy.getCVRQualifiers());
4333 if (RCVR.isStrictSupersetOf(LCVR)) {
4334 LHS = ImpCastExprToType(LHS.take(), RTy, CK_NoOp, LVK);
4335 LTy = LHS.get()->getType();
4337 else if (LCVR.isStrictSupersetOf(RCVR)) {
4338 RHS = ImpCastExprToType(RHS.take(), LTy, CK_NoOp, RVK);
4339 RTy = RHS.get()->getType();
4343 // C++11 [expr.cond]p4
4344 // If the second and third operands are glvalues of the same value
4345 // category and have the same type, the result is of that type and
4346 // value category and it is a bit-field if the second or the third
4347 // operand is a bit-field, or if both are bit-fields.
4348 // We only extend this to bitfields, not to the crazy other kinds of
4350 bool Same = Context.hasSameType(LTy, RTy);
4351 if (Same && LVK == RVK && LVK != VK_RValue &&
4352 LHS.get()->isOrdinaryOrBitFieldObject() &&
4353 RHS.get()->isOrdinaryOrBitFieldObject()) {
4354 VK = LHS.get()->getValueKind();
4355 if (LHS.get()->getObjectKind() == OK_BitField ||
4356 RHS.get()->getObjectKind() == OK_BitField)
4361 // C++11 [expr.cond]p5
4362 // Otherwise, the result is a prvalue. If the second and third operands
4363 // do not have the same type, and either has (cv) class type, ...
4364 if (!Same && (LTy->isRecordType() || RTy->isRecordType())) {
4365 // ... overload resolution is used to determine the conversions (if any)
4366 // to be applied to the operands. If the overload resolution fails, the
4367 // program is ill-formed.
4368 if (FindConditionalOverload(*this, LHS, RHS, QuestionLoc))
4372 // C++11 [expr.cond]p6
4373 // Lvalue-to-rvalue, array-to-pointer, and function-to-pointer standard
4374 // conversions are performed on the second and third operands.
4375 LHS = DefaultFunctionArrayLvalueConversion(LHS.take());
4376 RHS = DefaultFunctionArrayLvalueConversion(RHS.take());
4377 if (LHS.isInvalid() || RHS.isInvalid())
4379 LTy = LHS.get()->getType();
4380 RTy = RHS.get()->getType();
4382 // After those conversions, one of the following shall hold:
4383 // -- The second and third operands have the same type; the result
4384 // is of that type. If the operands have class type, the result
4385 // is a prvalue temporary of the result type, which is
4386 // copy-initialized from either the second operand or the third
4387 // operand depending on the value of the first operand.
4388 if (Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy)) {
4389 if (LTy->isRecordType()) {
4390 // The operands have class type. Make a temporary copy.
4391 if (RequireNonAbstractType(QuestionLoc, LTy,
4392 diag::err_allocation_of_abstract_type))
4394 InitializedEntity Entity = InitializedEntity::InitializeTemporary(LTy);
4396 ExprResult LHSCopy = PerformCopyInitialization(Entity,
4399 if (LHSCopy.isInvalid())
4402 ExprResult RHSCopy = PerformCopyInitialization(Entity,
4405 if (RHSCopy.isInvalid())
4415 // Extension: conditional operator involving vector types.
4416 if (LTy->isVectorType() || RTy->isVectorType())
4417 return CheckVectorOperands(LHS, RHS, QuestionLoc, /*isCompAssign*/false);
4419 // -- The second and third operands have arithmetic or enumeration type;
4420 // the usual arithmetic conversions are performed to bring them to a
4421 // common type, and the result is of that type.
4422 if (LTy->isArithmeticType() && RTy->isArithmeticType()) {
4423 UsualArithmeticConversions(LHS, RHS);
4424 if (LHS.isInvalid() || RHS.isInvalid())
4426 return LHS.get()->getType();
4429 // -- The second and third operands have pointer type, or one has pointer
4430 // type and the other is a null pointer constant, or both are null
4431 // pointer constants, at least one of which is non-integral; pointer
4432 // conversions and qualification conversions are performed to bring them
4433 // to their composite pointer type. The result is of the composite
4435 // -- The second and third operands have pointer to member type, or one has
4436 // pointer to member type and the other is a null pointer constant;
4437 // pointer to member conversions and qualification conversions are
4438 // performed to bring them to a common type, whose cv-qualification
4439 // shall match the cv-qualification of either the second or the third
4440 // operand. The result is of the common type.
4441 bool NonStandardCompositeType = false;
4442 QualType Composite = FindCompositePointerType(QuestionLoc, LHS, RHS,
4443 isSFINAEContext()? 0 : &NonStandardCompositeType);
4444 if (!Composite.isNull()) {
4445 if (NonStandardCompositeType)
4447 diag::ext_typecheck_cond_incompatible_operands_nonstandard)
4448 << LTy << RTy << Composite
4449 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
4454 // Similarly, attempt to find composite type of two objective-c pointers.
4455 Composite = FindCompositeObjCPointerType(LHS, RHS, QuestionLoc);
4456 if (!Composite.isNull())
4459 // Check if we are using a null with a non-pointer type.
4460 if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
4463 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
4464 << LHS.get()->getType() << RHS.get()->getType()
4465 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
4469 /// \brief Find a merged pointer type and convert the two expressions to it.
4471 /// This finds the composite pointer type (or member pointer type) for @p E1
4472 /// and @p E2 according to C++11 5.9p2. It converts both expressions to this
4473 /// type and returns it.
4474 /// It does not emit diagnostics.
4476 /// \param Loc The location of the operator requiring these two expressions to
4477 /// be converted to the composite pointer type.
4479 /// If \p NonStandardCompositeType is non-NULL, then we are permitted to find
4480 /// a non-standard (but still sane) composite type to which both expressions
4481 /// can be converted. When such a type is chosen, \c *NonStandardCompositeType
4482 /// will be set true.
4483 QualType Sema::FindCompositePointerType(SourceLocation Loc,
4484 Expr *&E1, Expr *&E2,
4485 bool *NonStandardCompositeType) {
4486 if (NonStandardCompositeType)
4487 *NonStandardCompositeType = false;
4489 assert(getLangOpts().CPlusPlus && "This function assumes C++");
4490 QualType T1 = E1->getType(), T2 = E2->getType();
4493 // Pointer conversions and qualification conversions are performed on
4494 // pointer operands to bring them to their composite pointer type. If
4495 // one operand is a null pointer constant, the composite pointer type is
4496 // std::nullptr_t if the other operand is also a null pointer constant or,
4497 // if the other operand is a pointer, the type of the other operand.
4498 if (!T1->isAnyPointerType() && !T1->isMemberPointerType() &&
4499 !T2->isAnyPointerType() && !T2->isMemberPointerType()) {
4500 if (T1->isNullPtrType() &&
4501 E2->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
4502 E2 = ImpCastExprToType(E2, T1, CK_NullToPointer).take();
4505 if (T2->isNullPtrType() &&
4506 E1->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
4507 E1 = ImpCastExprToType(E1, T2, CK_NullToPointer).take();
4513 if (E1->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
4514 if (T2->isMemberPointerType())
4515 E1 = ImpCastExprToType(E1, T2, CK_NullToMemberPointer).take();
4517 E1 = ImpCastExprToType(E1, T2, CK_NullToPointer).take();
4520 if (E2->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
4521 if (T1->isMemberPointerType())
4522 E2 = ImpCastExprToType(E2, T1, CK_NullToMemberPointer).take();
4524 E2 = ImpCastExprToType(E2, T1, CK_NullToPointer).take();
4528 // Now both have to be pointers or member pointers.
4529 if ((!T1->isPointerType() && !T1->isMemberPointerType()) ||
4530 (!T2->isPointerType() && !T2->isMemberPointerType()))
4533 // Otherwise, of one of the operands has type "pointer to cv1 void," then
4534 // the other has type "pointer to cv2 T" and the composite pointer type is
4535 // "pointer to cv12 void," where cv12 is the union of cv1 and cv2.
4536 // Otherwise, the composite pointer type is a pointer type similar to the
4537 // type of one of the operands, with a cv-qualification signature that is
4538 // the union of the cv-qualification signatures of the operand types.
4539 // In practice, the first part here is redundant; it's subsumed by the second.
4540 // What we do here is, we build the two possible composite types, and try the
4541 // conversions in both directions. If only one works, or if the two composite
4542 // types are the same, we have succeeded.
4543 // FIXME: extended qualifiers?
4544 typedef SmallVector<unsigned, 4> QualifierVector;
4545 QualifierVector QualifierUnion;
4546 typedef SmallVector<std::pair<const Type *, const Type *>, 4>
4547 ContainingClassVector;
4548 ContainingClassVector MemberOfClass;
4549 QualType Composite1 = Context.getCanonicalType(T1),
4550 Composite2 = Context.getCanonicalType(T2);
4551 unsigned NeedConstBefore = 0;
4553 const PointerType *Ptr1, *Ptr2;
4554 if ((Ptr1 = Composite1->getAs<PointerType>()) &&
4555 (Ptr2 = Composite2->getAs<PointerType>())) {
4556 Composite1 = Ptr1->getPointeeType();
4557 Composite2 = Ptr2->getPointeeType();
4559 // If we're allowed to create a non-standard composite type, keep track
4560 // of where we need to fill in additional 'const' qualifiers.
4561 if (NonStandardCompositeType &&
4562 Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers())
4563 NeedConstBefore = QualifierUnion.size();
4565 QualifierUnion.push_back(
4566 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
4567 MemberOfClass.push_back(std::make_pair((const Type *)0, (const Type *)0));
4571 const MemberPointerType *MemPtr1, *MemPtr2;
4572 if ((MemPtr1 = Composite1->getAs<MemberPointerType>()) &&
4573 (MemPtr2 = Composite2->getAs<MemberPointerType>())) {
4574 Composite1 = MemPtr1->getPointeeType();
4575 Composite2 = MemPtr2->getPointeeType();
4577 // If we're allowed to create a non-standard composite type, keep track
4578 // of where we need to fill in additional 'const' qualifiers.
4579 if (NonStandardCompositeType &&
4580 Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers())
4581 NeedConstBefore = QualifierUnion.size();
4583 QualifierUnion.push_back(
4584 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
4585 MemberOfClass.push_back(std::make_pair(MemPtr1->getClass(),
4586 MemPtr2->getClass()));
4590 // FIXME: block pointer types?
4592 // Cannot unwrap any more types.
4596 if (NeedConstBefore && NonStandardCompositeType) {
4597 // Extension: Add 'const' to qualifiers that come before the first qualifier
4598 // mismatch, so that our (non-standard!) composite type meets the
4599 // requirements of C++ [conv.qual]p4 bullet 3.
4600 for (unsigned I = 0; I != NeedConstBefore; ++I) {
4601 if ((QualifierUnion[I] & Qualifiers::Const) == 0) {
4602 QualifierUnion[I] = QualifierUnion[I] | Qualifiers::Const;
4603 *NonStandardCompositeType = true;
4608 // Rewrap the composites as pointers or member pointers with the union CVRs.
4609 ContainingClassVector::reverse_iterator MOC
4610 = MemberOfClass.rbegin();
4611 for (QualifierVector::reverse_iterator
4612 I = QualifierUnion.rbegin(),
4613 E = QualifierUnion.rend();
4614 I != E; (void)++I, ++MOC) {
4615 Qualifiers Quals = Qualifiers::fromCVRMask(*I);
4616 if (MOC->first && MOC->second) {
4617 // Rebuild member pointer type
4618 Composite1 = Context.getMemberPointerType(
4619 Context.getQualifiedType(Composite1, Quals),
4621 Composite2 = Context.getMemberPointerType(
4622 Context.getQualifiedType(Composite2, Quals),
4625 // Rebuild pointer type
4627 = Context.getPointerType(Context.getQualifiedType(Composite1, Quals));
4629 = Context.getPointerType(Context.getQualifiedType(Composite2, Quals));
4633 // Try to convert to the first composite pointer type.
4634 InitializedEntity Entity1
4635 = InitializedEntity::InitializeTemporary(Composite1);
4636 InitializationKind Kind
4637 = InitializationKind::CreateCopy(Loc, SourceLocation());
4638 InitializationSequence E1ToC1(*this, Entity1, Kind, E1);
4639 InitializationSequence E2ToC1(*this, Entity1, Kind, E2);
4641 if (E1ToC1 && E2ToC1) {
4642 // Conversion to Composite1 is viable.
4643 if (!Context.hasSameType(Composite1, Composite2)) {
4644 // Composite2 is a different type from Composite1. Check whether
4645 // Composite2 is also viable.
4646 InitializedEntity Entity2
4647 = InitializedEntity::InitializeTemporary(Composite2);
4648 InitializationSequence E1ToC2(*this, Entity2, Kind, E1);
4649 InitializationSequence E2ToC2(*this, Entity2, Kind, E2);
4650 if (E1ToC2 && E2ToC2) {
4651 // Both Composite1 and Composite2 are viable and are different;
4652 // this is an ambiguity.
4657 // Convert E1 to Composite1
4659 = E1ToC1.Perform(*this, Entity1, Kind, E1);
4660 if (E1Result.isInvalid())
4662 E1 = E1Result.takeAs<Expr>();
4664 // Convert E2 to Composite1
4666 = E2ToC1.Perform(*this, Entity1, Kind, E2);
4667 if (E2Result.isInvalid())
4669 E2 = E2Result.takeAs<Expr>();
4674 // Check whether Composite2 is viable.
4675 InitializedEntity Entity2
4676 = InitializedEntity::InitializeTemporary(Composite2);
4677 InitializationSequence E1ToC2(*this, Entity2, Kind, E1);
4678 InitializationSequence E2ToC2(*this, Entity2, Kind, E2);
4679 if (!E1ToC2 || !E2ToC2)
4682 // Convert E1 to Composite2
4684 = E1ToC2.Perform(*this, Entity2, Kind, E1);
4685 if (E1Result.isInvalid())
4687 E1 = E1Result.takeAs<Expr>();
4689 // Convert E2 to Composite2
4691 = E2ToC2.Perform(*this, Entity2, Kind, E2);
4692 if (E2Result.isInvalid())
4694 E2 = E2Result.takeAs<Expr>();
4699 ExprResult Sema::MaybeBindToTemporary(Expr *E) {
4703 assert(!isa<CXXBindTemporaryExpr>(E) && "Double-bound temporary?");
4705 // If the result is a glvalue, we shouldn't bind it.
4709 // In ARC, calls that return a retainable type can return retained,
4710 // in which case we have to insert a consuming cast.
4711 if (getLangOpts().ObjCAutoRefCount &&
4712 E->getType()->isObjCRetainableType()) {
4714 bool ReturnsRetained;
4716 // For actual calls, we compute this by examining the type of the
4718 if (CallExpr *Call = dyn_cast<CallExpr>(E)) {
4719 Expr *Callee = Call->getCallee()->IgnoreParens();
4720 QualType T = Callee->getType();
4722 if (T == Context.BoundMemberTy) {
4723 // Handle pointer-to-members.
4724 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(Callee))
4725 T = BinOp->getRHS()->getType();
4726 else if (MemberExpr *Mem = dyn_cast<MemberExpr>(Callee))
4727 T = Mem->getMemberDecl()->getType();
4730 if (const PointerType *Ptr = T->getAs<PointerType>())
4731 T = Ptr->getPointeeType();
4732 else if (const BlockPointerType *Ptr = T->getAs<BlockPointerType>())
4733 T = Ptr->getPointeeType();
4734 else if (const MemberPointerType *MemPtr = T->getAs<MemberPointerType>())
4735 T = MemPtr->getPointeeType();
4737 const FunctionType *FTy = T->getAs<FunctionType>();
4738 assert(FTy && "call to value not of function type?");
4739 ReturnsRetained = FTy->getExtInfo().getProducesResult();
4741 // ActOnStmtExpr arranges things so that StmtExprs of retainable
4742 // type always produce a +1 object.
4743 } else if (isa<StmtExpr>(E)) {
4744 ReturnsRetained = true;
4746 // We hit this case with the lambda conversion-to-block optimization;
4747 // we don't want any extra casts here.
4748 } else if (isa<CastExpr>(E) &&
4749 isa<BlockExpr>(cast<CastExpr>(E)->getSubExpr())) {
4752 // For message sends and property references, we try to find an
4753 // actual method. FIXME: we should infer retention by selector in
4754 // cases where we don't have an actual method.
4756 ObjCMethodDecl *D = 0;
4757 if (ObjCMessageExpr *Send = dyn_cast<ObjCMessageExpr>(E)) {
4758 D = Send->getMethodDecl();
4759 } else if (ObjCBoxedExpr *BoxedExpr = dyn_cast<ObjCBoxedExpr>(E)) {
4760 D = BoxedExpr->getBoxingMethod();
4761 } else if (ObjCArrayLiteral *ArrayLit = dyn_cast<ObjCArrayLiteral>(E)) {
4762 D = ArrayLit->getArrayWithObjectsMethod();
4763 } else if (ObjCDictionaryLiteral *DictLit
4764 = dyn_cast<ObjCDictionaryLiteral>(E)) {
4765 D = DictLit->getDictWithObjectsMethod();
4768 ReturnsRetained = (D && D->hasAttr<NSReturnsRetainedAttr>());
4770 // Don't do reclaims on performSelector calls; despite their
4771 // return type, the invoked method doesn't necessarily actually
4772 // return an object.
4773 if (!ReturnsRetained &&
4774 D && D->getMethodFamily() == OMF_performSelector)
4778 // Don't reclaim an object of Class type.
4779 if (!ReturnsRetained && E->getType()->isObjCARCImplicitlyUnretainedType())
4782 ExprNeedsCleanups = true;
4784 CastKind ck = (ReturnsRetained ? CK_ARCConsumeObject
4785 : CK_ARCReclaimReturnedObject);
4786 return Owned(ImplicitCastExpr::Create(Context, E->getType(), ck, E, 0,
4790 if (!getLangOpts().CPlusPlus)
4793 // Search for the base element type (cf. ASTContext::getBaseElementType) with
4794 // a fast path for the common case that the type is directly a RecordType.
4795 const Type *T = Context.getCanonicalType(E->getType().getTypePtr());
4796 const RecordType *RT = 0;
4798 switch (T->getTypeClass()) {
4800 RT = cast<RecordType>(T);
4802 case Type::ConstantArray:
4803 case Type::IncompleteArray:
4804 case Type::VariableArray:
4805 case Type::DependentSizedArray:
4806 T = cast<ArrayType>(T)->getElementType().getTypePtr();
4813 // That should be enough to guarantee that this type is complete, if we're
4814 // not processing a decltype expression.
4815 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
4816 if (RD->isInvalidDecl() || RD->isDependentContext())
4819 bool IsDecltype = ExprEvalContexts.back().IsDecltype;
4820 CXXDestructorDecl *Destructor = IsDecltype ? 0 : LookupDestructor(RD);
4823 MarkFunctionReferenced(E->getExprLoc(), Destructor);
4824 CheckDestructorAccess(E->getExprLoc(), Destructor,
4825 PDiag(diag::err_access_dtor_temp)
4827 if (DiagnoseUseOfDecl(Destructor, E->getExprLoc()))
4830 // If destructor is trivial, we can avoid the extra copy.
4831 if (Destructor->isTrivial())
4834 // We need a cleanup, but we don't need to remember the temporary.
4835 ExprNeedsCleanups = true;
4838 CXXTemporary *Temp = CXXTemporary::Create(Context, Destructor);
4839 CXXBindTemporaryExpr *Bind = CXXBindTemporaryExpr::Create(Context, Temp, E);
4842 ExprEvalContexts.back().DelayedDecltypeBinds.push_back(Bind);
4848 Sema::MaybeCreateExprWithCleanups(ExprResult SubExpr) {
4849 if (SubExpr.isInvalid())
4852 return Owned(MaybeCreateExprWithCleanups(SubExpr.take()));
4855 Expr *Sema::MaybeCreateExprWithCleanups(Expr *SubExpr) {
4856 assert(SubExpr && "sub expression can't be null!");
4858 CleanupVarDeclMarking();
4860 unsigned FirstCleanup = ExprEvalContexts.back().NumCleanupObjects;
4861 assert(ExprCleanupObjects.size() >= FirstCleanup);
4862 assert(ExprNeedsCleanups || ExprCleanupObjects.size() == FirstCleanup);
4863 if (!ExprNeedsCleanups)
4866 ArrayRef<ExprWithCleanups::CleanupObject> Cleanups
4867 = llvm::makeArrayRef(ExprCleanupObjects.begin() + FirstCleanup,
4868 ExprCleanupObjects.size() - FirstCleanup);
4870 Expr *E = ExprWithCleanups::Create(Context, SubExpr, Cleanups);
4871 DiscardCleanupsInEvaluationContext();
4876 Stmt *Sema::MaybeCreateStmtWithCleanups(Stmt *SubStmt) {
4877 assert(SubStmt && "sub statement can't be null!");
4879 CleanupVarDeclMarking();
4881 if (!ExprNeedsCleanups)
4884 // FIXME: In order to attach the temporaries, wrap the statement into
4885 // a StmtExpr; currently this is only used for asm statements.
4886 // This is hacky, either create a new CXXStmtWithTemporaries statement or
4887 // a new AsmStmtWithTemporaries.
4888 CompoundStmt *CompStmt = new (Context) CompoundStmt(Context, SubStmt,
4891 Expr *E = new (Context) StmtExpr(CompStmt, Context.VoidTy, SourceLocation(),
4893 return MaybeCreateExprWithCleanups(E);
4896 /// Process the expression contained within a decltype. For such expressions,
4897 /// certain semantic checks on temporaries are delayed until this point, and
4898 /// are omitted for the 'topmost' call in the decltype expression. If the
4899 /// topmost call bound a temporary, strip that temporary off the expression.
4900 ExprResult Sema::ActOnDecltypeExpression(Expr *E) {
4901 assert(ExprEvalContexts.back().IsDecltype && "not in a decltype expression");
4903 // C++11 [expr.call]p11:
4904 // If a function call is a prvalue of object type,
4905 // -- if the function call is either
4906 // -- the operand of a decltype-specifier, or
4907 // -- the right operand of a comma operator that is the operand of a
4908 // decltype-specifier,
4909 // a temporary object is not introduced for the prvalue.
4911 // Recursively rebuild ParenExprs and comma expressions to strip out the
4912 // outermost CXXBindTemporaryExpr, if any.
4913 if (ParenExpr *PE = dyn_cast<ParenExpr>(E)) {
4914 ExprResult SubExpr = ActOnDecltypeExpression(PE->getSubExpr());
4915 if (SubExpr.isInvalid())
4917 if (SubExpr.get() == PE->getSubExpr())
4919 return ActOnParenExpr(PE->getLParen(), PE->getRParen(), SubExpr.take());
4921 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
4922 if (BO->getOpcode() == BO_Comma) {
4923 ExprResult RHS = ActOnDecltypeExpression(BO->getRHS());
4924 if (RHS.isInvalid())
4926 if (RHS.get() == BO->getRHS())
4928 return Owned(new (Context) BinaryOperator(BO->getLHS(), RHS.take(),
4929 BO_Comma, BO->getType(),
4931 BO->getObjectKind(),
4932 BO->getOperatorLoc(),
4933 BO->isFPContractable()));
4937 CXXBindTemporaryExpr *TopBind = dyn_cast<CXXBindTemporaryExpr>(E);
4939 E = TopBind->getSubExpr();
4941 // Disable the special decltype handling now.
4942 ExprEvalContexts.back().IsDecltype = false;
4944 // In MS mode, don't perform any extra checking of call return types within a
4945 // decltype expression.
4946 if (getLangOpts().MicrosoftMode)
4949 // Perform the semantic checks we delayed until this point.
4950 CallExpr *TopCall = dyn_cast<CallExpr>(E);
4951 for (unsigned I = 0, N = ExprEvalContexts.back().DelayedDecltypeCalls.size();
4953 CallExpr *Call = ExprEvalContexts.back().DelayedDecltypeCalls[I];
4954 if (Call == TopCall)
4957 if (CheckCallReturnType(Call->getCallReturnType(),
4958 Call->getLocStart(),
4959 Call, Call->getDirectCallee()))
4963 // Now all relevant types are complete, check the destructors are accessible
4964 // and non-deleted, and annotate them on the temporaries.
4965 for (unsigned I = 0, N = ExprEvalContexts.back().DelayedDecltypeBinds.size();
4967 CXXBindTemporaryExpr *Bind =
4968 ExprEvalContexts.back().DelayedDecltypeBinds[I];
4969 if (Bind == TopBind)
4972 CXXTemporary *Temp = Bind->getTemporary();
4975 Bind->getType()->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
4976 CXXDestructorDecl *Destructor = LookupDestructor(RD);
4977 Temp->setDestructor(Destructor);
4979 MarkFunctionReferenced(Bind->getExprLoc(), Destructor);
4980 CheckDestructorAccess(Bind->getExprLoc(), Destructor,
4981 PDiag(diag::err_access_dtor_temp)
4982 << Bind->getType());
4983 if (DiagnoseUseOfDecl(Destructor, Bind->getExprLoc()))
4986 // We need a cleanup, but we don't need to remember the temporary.
4987 ExprNeedsCleanups = true;
4990 // Possibly strip off the top CXXBindTemporaryExpr.
4995 Sema::ActOnStartCXXMemberReference(Scope *S, Expr *Base, SourceLocation OpLoc,
4996 tok::TokenKind OpKind, ParsedType &ObjectType,
4997 bool &MayBePseudoDestructor) {
4998 // Since this might be a postfix expression, get rid of ParenListExprs.
4999 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
5000 if (Result.isInvalid()) return ExprError();
5001 Base = Result.get();
5003 Result = CheckPlaceholderExpr(Base);
5004 if (Result.isInvalid()) return ExprError();
5005 Base = Result.take();
5007 QualType BaseType = Base->getType();
5008 MayBePseudoDestructor = false;
5009 if (BaseType->isDependentType()) {
5010 // If we have a pointer to a dependent type and are using the -> operator,
5011 // the object type is the type that the pointer points to. We might still
5012 // have enough information about that type to do something useful.
5013 if (OpKind == tok::arrow)
5014 if (const PointerType *Ptr = BaseType->getAs<PointerType>())
5015 BaseType = Ptr->getPointeeType();
5017 ObjectType = ParsedType::make(BaseType);
5018 MayBePseudoDestructor = true;
5022 // C++ [over.match.oper]p8:
5023 // [...] When operator->returns, the operator-> is applied to the value
5024 // returned, with the original second operand.
5025 if (OpKind == tok::arrow) {
5026 // The set of types we've considered so far.
5027 llvm::SmallPtrSet<CanQualType,8> CTypes;
5028 SmallVector<SourceLocation, 8> Locations;
5029 CTypes.insert(Context.getCanonicalType(BaseType));
5031 while (BaseType->isRecordType()) {
5032 Result = BuildOverloadedArrowExpr(S, Base, OpLoc);
5033 if (Result.isInvalid())
5035 Base = Result.get();
5036 if (CXXOperatorCallExpr *OpCall = dyn_cast<CXXOperatorCallExpr>(Base))
5037 Locations.push_back(OpCall->getDirectCallee()->getLocation());
5038 BaseType = Base->getType();
5039 CanQualType CBaseType = Context.getCanonicalType(BaseType);
5040 if (!CTypes.insert(CBaseType)) {
5041 Diag(OpLoc, diag::err_operator_arrow_circular);
5042 for (unsigned i = 0; i < Locations.size(); i++)
5043 Diag(Locations[i], diag::note_declared_at);
5048 if (BaseType->isPointerType() || BaseType->isObjCObjectPointerType())
5049 BaseType = BaseType->getPointeeType();
5052 // Objective-C properties allow "." access on Objective-C pointer types,
5053 // so adjust the base type to the object type itself.
5054 if (BaseType->isObjCObjectPointerType())
5055 BaseType = BaseType->getPointeeType();
5057 // C++ [basic.lookup.classref]p2:
5058 // [...] If the type of the object expression is of pointer to scalar
5059 // type, the unqualified-id is looked up in the context of the complete
5060 // postfix-expression.
5062 // This also indicates that we could be parsing a pseudo-destructor-name.
5063 // Note that Objective-C class and object types can be pseudo-destructor
5064 // expressions or normal member (ivar or property) access expressions.
5065 if (BaseType->isObjCObjectOrInterfaceType()) {
5066 MayBePseudoDestructor = true;
5067 } else if (!BaseType->isRecordType()) {
5068 ObjectType = ParsedType();
5069 MayBePseudoDestructor = true;
5073 // The object type must be complete (or dependent), or
5074 // C++11 [expr.prim.general]p3:
5075 // Unlike the object expression in other contexts, *this is not required to
5076 // be of complete type for purposes of class member access (5.2.5) outside
5077 // the member function body.
5078 if (!BaseType->isDependentType() &&
5079 !isThisOutsideMemberFunctionBody(BaseType) &&
5080 RequireCompleteType(OpLoc, BaseType, diag::err_incomplete_member_access))
5083 // C++ [basic.lookup.classref]p2:
5084 // If the id-expression in a class member access (5.2.5) is an
5085 // unqualified-id, and the type of the object expression is of a class
5086 // type C (or of pointer to a class type C), the unqualified-id is looked
5087 // up in the scope of class C. [...]
5088 ObjectType = ParsedType::make(BaseType);
5092 ExprResult Sema::DiagnoseDtorReference(SourceLocation NameLoc,
5094 SourceLocation ExpectedLParenLoc = PP.getLocForEndOfToken(NameLoc);
5095 Diag(MemExpr->getLocStart(), diag::err_dtor_expr_without_call)
5096 << isa<CXXPseudoDestructorExpr>(MemExpr)
5097 << FixItHint::CreateInsertion(ExpectedLParenLoc, "()");
5099 return ActOnCallExpr(/*Scope*/ 0,
5101 /*LPLoc*/ ExpectedLParenLoc,
5103 /*RPLoc*/ ExpectedLParenLoc);
5106 static bool CheckArrow(Sema& S, QualType& ObjectType, Expr *&Base,
5107 tok::TokenKind& OpKind, SourceLocation OpLoc) {
5108 if (Base->hasPlaceholderType()) {
5109 ExprResult result = S.CheckPlaceholderExpr(Base);
5110 if (result.isInvalid()) return true;
5111 Base = result.take();
5113 ObjectType = Base->getType();
5115 // C++ [expr.pseudo]p2:
5116 // The left-hand side of the dot operator shall be of scalar type. The
5117 // left-hand side of the arrow operator shall be of pointer to scalar type.
5118 // This scalar type is the object type.
5119 // Note that this is rather different from the normal handling for the
5121 if (OpKind == tok::arrow) {
5122 if (const PointerType *Ptr = ObjectType->getAs<PointerType>()) {
5123 ObjectType = Ptr->getPointeeType();
5124 } else if (!Base->isTypeDependent()) {
5125 // The user wrote "p->" when she probably meant "p."; fix it.
5126 S.Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
5127 << ObjectType << true
5128 << FixItHint::CreateReplacement(OpLoc, ".");
5129 if (S.isSFINAEContext())
5132 OpKind = tok::period;
5139 ExprResult Sema::BuildPseudoDestructorExpr(Expr *Base,
5140 SourceLocation OpLoc,
5141 tok::TokenKind OpKind,
5142 const CXXScopeSpec &SS,
5143 TypeSourceInfo *ScopeTypeInfo,
5144 SourceLocation CCLoc,
5145 SourceLocation TildeLoc,
5146 PseudoDestructorTypeStorage Destructed,
5147 bool HasTrailingLParen) {
5148 TypeSourceInfo *DestructedTypeInfo = Destructed.getTypeSourceInfo();
5150 QualType ObjectType;
5151 if (CheckArrow(*this, ObjectType, Base, OpKind, OpLoc))
5154 if (!ObjectType->isDependentType() && !ObjectType->isScalarType() &&
5155 !ObjectType->isVectorType()) {
5156 if (getLangOpts().MicrosoftMode && ObjectType->isVoidType())
5157 Diag(OpLoc, diag::ext_pseudo_dtor_on_void) << Base->getSourceRange();
5159 Diag(OpLoc, diag::err_pseudo_dtor_base_not_scalar)
5160 << ObjectType << Base->getSourceRange();
5164 // C++ [expr.pseudo]p2:
5165 // [...] The cv-unqualified versions of the object type and of the type
5166 // designated by the pseudo-destructor-name shall be the same type.
5167 if (DestructedTypeInfo) {
5168 QualType DestructedType = DestructedTypeInfo->getType();
5169 SourceLocation DestructedTypeStart
5170 = DestructedTypeInfo->getTypeLoc().getLocalSourceRange().getBegin();
5171 if (!DestructedType->isDependentType() && !ObjectType->isDependentType()) {
5172 if (!Context.hasSameUnqualifiedType(DestructedType, ObjectType)) {
5173 Diag(DestructedTypeStart, diag::err_pseudo_dtor_type_mismatch)
5174 << ObjectType << DestructedType << Base->getSourceRange()
5175 << DestructedTypeInfo->getTypeLoc().getLocalSourceRange();
5177 // Recover by setting the destructed type to the object type.
5178 DestructedType = ObjectType;
5179 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(ObjectType,
5180 DestructedTypeStart);
5181 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
5182 } else if (DestructedType.getObjCLifetime() !=
5183 ObjectType.getObjCLifetime()) {
5185 if (DestructedType.getObjCLifetime() == Qualifiers::OCL_None) {
5186 // Okay: just pretend that the user provided the correctly-qualified
5189 Diag(DestructedTypeStart, diag::err_arc_pseudo_dtor_inconstant_quals)
5190 << ObjectType << DestructedType << Base->getSourceRange()
5191 << DestructedTypeInfo->getTypeLoc().getLocalSourceRange();
5194 // Recover by setting the destructed type to the object type.
5195 DestructedType = ObjectType;
5196 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(ObjectType,
5197 DestructedTypeStart);
5198 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
5203 // C++ [expr.pseudo]p2:
5204 // [...] Furthermore, the two type-names in a pseudo-destructor-name of the
5207 // ::[opt] nested-name-specifier[opt] type-name :: ~ type-name
5209 // shall designate the same scalar type.
5210 if (ScopeTypeInfo) {
5211 QualType ScopeType = ScopeTypeInfo->getType();
5212 if (!ScopeType->isDependentType() && !ObjectType->isDependentType() &&
5213 !Context.hasSameUnqualifiedType(ScopeType, ObjectType)) {
5215 Diag(ScopeTypeInfo->getTypeLoc().getLocalSourceRange().getBegin(),
5216 diag::err_pseudo_dtor_type_mismatch)
5217 << ObjectType << ScopeType << Base->getSourceRange()
5218 << ScopeTypeInfo->getTypeLoc().getLocalSourceRange();
5220 ScopeType = QualType();
5226 = new (Context) CXXPseudoDestructorExpr(Context, Base,
5227 OpKind == tok::arrow, OpLoc,
5228 SS.getWithLocInContext(Context),
5234 if (HasTrailingLParen)
5235 return Owned(Result);
5237 return DiagnoseDtorReference(Destructed.getLocation(), Result);
5240 ExprResult Sema::ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
5241 SourceLocation OpLoc,
5242 tok::TokenKind OpKind,
5244 UnqualifiedId &FirstTypeName,
5245 SourceLocation CCLoc,
5246 SourceLocation TildeLoc,
5247 UnqualifiedId &SecondTypeName,
5248 bool HasTrailingLParen) {
5249 assert((FirstTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
5250 FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) &&
5251 "Invalid first type name in pseudo-destructor");
5252 assert((SecondTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
5253 SecondTypeName.getKind() == UnqualifiedId::IK_Identifier) &&
5254 "Invalid second type name in pseudo-destructor");
5256 QualType ObjectType;
5257 if (CheckArrow(*this, ObjectType, Base, OpKind, OpLoc))
5260 // Compute the object type that we should use for name lookup purposes. Only
5261 // record types and dependent types matter.
5262 ParsedType ObjectTypePtrForLookup;
5264 if (ObjectType->isRecordType())
5265 ObjectTypePtrForLookup = ParsedType::make(ObjectType);
5266 else if (ObjectType->isDependentType())
5267 ObjectTypePtrForLookup = ParsedType::make(Context.DependentTy);
5270 // Convert the name of the type being destructed (following the ~) into a
5271 // type (with source-location information).
5272 QualType DestructedType;
5273 TypeSourceInfo *DestructedTypeInfo = 0;
5274 PseudoDestructorTypeStorage Destructed;
5275 if (SecondTypeName.getKind() == UnqualifiedId::IK_Identifier) {
5276 ParsedType T = getTypeName(*SecondTypeName.Identifier,
5277 SecondTypeName.StartLocation,
5278 S, &SS, true, false, ObjectTypePtrForLookup);
5280 ((SS.isSet() && !computeDeclContext(SS, false)) ||
5281 (!SS.isSet() && ObjectType->isDependentType()))) {
5282 // The name of the type being destroyed is a dependent name, and we
5283 // couldn't find anything useful in scope. Just store the identifier and
5284 // it's location, and we'll perform (qualified) name lookup again at
5285 // template instantiation time.
5286 Destructed = PseudoDestructorTypeStorage(SecondTypeName.Identifier,
5287 SecondTypeName.StartLocation);
5289 Diag(SecondTypeName.StartLocation,
5290 diag::err_pseudo_dtor_destructor_non_type)
5291 << SecondTypeName.Identifier << ObjectType;
5292 if (isSFINAEContext())
5295 // Recover by assuming we had the right type all along.
5296 DestructedType = ObjectType;
5298 DestructedType = GetTypeFromParser(T, &DestructedTypeInfo);
5300 // Resolve the template-id to a type.
5301 TemplateIdAnnotation *TemplateId = SecondTypeName.TemplateId;
5302 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
5303 TemplateId->NumArgs);
5304 TypeResult T = ActOnTemplateIdType(TemplateId->SS,
5305 TemplateId->TemplateKWLoc,
5306 TemplateId->Template,
5307 TemplateId->TemplateNameLoc,
5308 TemplateId->LAngleLoc,
5310 TemplateId->RAngleLoc);
5311 if (T.isInvalid() || !T.get()) {
5312 // Recover by assuming we had the right type all along.
5313 DestructedType = ObjectType;
5315 DestructedType = GetTypeFromParser(T.get(), &DestructedTypeInfo);
5318 // If we've performed some kind of recovery, (re-)build the type source
5320 if (!DestructedType.isNull()) {
5321 if (!DestructedTypeInfo)
5322 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(DestructedType,
5323 SecondTypeName.StartLocation);
5324 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
5327 // Convert the name of the scope type (the type prior to '::') into a type.
5328 TypeSourceInfo *ScopeTypeInfo = 0;
5330 if (FirstTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
5331 FirstTypeName.Identifier) {
5332 if (FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) {
5333 ParsedType T = getTypeName(*FirstTypeName.Identifier,
5334 FirstTypeName.StartLocation,
5335 S, &SS, true, false, ObjectTypePtrForLookup);
5337 Diag(FirstTypeName.StartLocation,
5338 diag::err_pseudo_dtor_destructor_non_type)
5339 << FirstTypeName.Identifier << ObjectType;
5341 if (isSFINAEContext())
5344 // Just drop this type. It's unnecessary anyway.
5345 ScopeType = QualType();
5347 ScopeType = GetTypeFromParser(T, &ScopeTypeInfo);
5349 // Resolve the template-id to a type.
5350 TemplateIdAnnotation *TemplateId = FirstTypeName.TemplateId;
5351 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
5352 TemplateId->NumArgs);
5353 TypeResult T = ActOnTemplateIdType(TemplateId->SS,
5354 TemplateId->TemplateKWLoc,
5355 TemplateId->Template,
5356 TemplateId->TemplateNameLoc,
5357 TemplateId->LAngleLoc,
5359 TemplateId->RAngleLoc);
5360 if (T.isInvalid() || !T.get()) {
5361 // Recover by dropping this type.
5362 ScopeType = QualType();
5364 ScopeType = GetTypeFromParser(T.get(), &ScopeTypeInfo);
5368 if (!ScopeType.isNull() && !ScopeTypeInfo)
5369 ScopeTypeInfo = Context.getTrivialTypeSourceInfo(ScopeType,
5370 FirstTypeName.StartLocation);
5373 return BuildPseudoDestructorExpr(Base, OpLoc, OpKind, SS,
5374 ScopeTypeInfo, CCLoc, TildeLoc,
5375 Destructed, HasTrailingLParen);
5378 ExprResult Sema::ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
5379 SourceLocation OpLoc,
5380 tok::TokenKind OpKind,
5381 SourceLocation TildeLoc,
5383 bool HasTrailingLParen) {
5384 QualType ObjectType;
5385 if (CheckArrow(*this, ObjectType, Base, OpKind, OpLoc))
5388 QualType T = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc());
5391 DecltypeTypeLoc DecltypeTL = TLB.push<DecltypeTypeLoc>(T);
5392 DecltypeTL.setNameLoc(DS.getTypeSpecTypeLoc());
5393 TypeSourceInfo *DestructedTypeInfo = TLB.getTypeSourceInfo(Context, T);
5394 PseudoDestructorTypeStorage Destructed(DestructedTypeInfo);
5396 return BuildPseudoDestructorExpr(Base, OpLoc, OpKind, CXXScopeSpec(),
5397 0, SourceLocation(), TildeLoc,
5398 Destructed, HasTrailingLParen);
5401 ExprResult Sema::BuildCXXMemberCallExpr(Expr *E, NamedDecl *FoundDecl,
5402 CXXConversionDecl *Method,
5403 bool HadMultipleCandidates) {
5404 if (Method->getParent()->isLambda() &&
5405 Method->getConversionType()->isBlockPointerType()) {
5406 // This is a lambda coversion to block pointer; check if the argument
5409 CastExpr *CE = dyn_cast<CastExpr>(SubE);
5410 if (CE && CE->getCastKind() == CK_NoOp)
5411 SubE = CE->getSubExpr();
5412 SubE = SubE->IgnoreParens();
5413 if (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(SubE))
5414 SubE = BE->getSubExpr();
5415 if (isa<LambdaExpr>(SubE)) {
5416 // For the conversion to block pointer on a lambda expression, we
5417 // construct a special BlockLiteral instead; this doesn't really make
5418 // a difference in ARC, but outside of ARC the resulting block literal
5419 // follows the normal lifetime rules for block literals instead of being
5421 DiagnosticErrorTrap Trap(Diags);
5422 ExprResult Exp = BuildBlockForLambdaConversion(E->getExprLoc(),
5425 if (Exp.isInvalid())
5426 Diag(E->getExprLoc(), diag::note_lambda_to_block_conv);
5432 ExprResult Exp = PerformObjectArgumentInitialization(E, /*Qualifier=*/0,
5434 if (Exp.isInvalid())
5438 new (Context) MemberExpr(Exp.take(), /*IsArrow=*/false, Method,
5439 SourceLocation(), Context.BoundMemberTy,
5440 VK_RValue, OK_Ordinary);
5441 if (HadMultipleCandidates)
5442 ME->setHadMultipleCandidates(true);
5443 MarkMemberReferenced(ME);
5445 QualType ResultType = Method->getResultType();
5446 ExprValueKind VK = Expr::getValueKindForType(ResultType);
5447 ResultType = ResultType.getNonLValueExprType(Context);
5449 CXXMemberCallExpr *CE =
5450 new (Context) CXXMemberCallExpr(Context, ME, None, ResultType, VK,
5451 Exp.get()->getLocEnd());
5455 ExprResult Sema::BuildCXXNoexceptExpr(SourceLocation KeyLoc, Expr *Operand,
5456 SourceLocation RParen) {
5457 CanThrowResult CanThrow = canThrow(Operand);
5458 return Owned(new (Context) CXXNoexceptExpr(Context.BoolTy, Operand,
5459 CanThrow, KeyLoc, RParen));
5462 ExprResult Sema::ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation,
5463 Expr *Operand, SourceLocation RParen) {
5464 return BuildCXXNoexceptExpr(KeyLoc, Operand, RParen);
5467 static bool IsSpecialDiscardedValue(Expr *E) {
5468 // In C++11, discarded-value expressions of a certain form are special,
5469 // according to [expr]p10:
5470 // The lvalue-to-rvalue conversion (4.1) is applied only if the
5471 // expression is an lvalue of volatile-qualified type and it has
5472 // one of the following forms:
5473 E = E->IgnoreParens();
5475 // - id-expression (5.1.1),
5476 if (isa<DeclRefExpr>(E))
5479 // - subscripting (5.2.1),
5480 if (isa<ArraySubscriptExpr>(E))
5483 // - class member access (5.2.5),
5484 if (isa<MemberExpr>(E))
5487 // - indirection (5.3.1),
5488 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E))
5489 if (UO->getOpcode() == UO_Deref)
5492 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
5493 // - pointer-to-member operation (5.5),
5494 if (BO->isPtrMemOp())
5497 // - comma expression (5.18) where the right operand is one of the above.
5498 if (BO->getOpcode() == BO_Comma)
5499 return IsSpecialDiscardedValue(BO->getRHS());
5502 // - conditional expression (5.16) where both the second and the third
5503 // operands are one of the above, or
5504 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E))
5505 return IsSpecialDiscardedValue(CO->getTrueExpr()) &&
5506 IsSpecialDiscardedValue(CO->getFalseExpr());
5507 // The related edge case of "*x ?: *x".
5508 if (BinaryConditionalOperator *BCO =
5509 dyn_cast<BinaryConditionalOperator>(E)) {
5510 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(BCO->getTrueExpr()))
5511 return IsSpecialDiscardedValue(OVE->getSourceExpr()) &&
5512 IsSpecialDiscardedValue(BCO->getFalseExpr());
5515 // Objective-C++ extensions to the rule.
5516 if (isa<PseudoObjectExpr>(E) || isa<ObjCIvarRefExpr>(E))
5522 /// Perform the conversions required for an expression used in a
5523 /// context that ignores the result.
5524 ExprResult Sema::IgnoredValueConversions(Expr *E) {
5525 if (E->hasPlaceholderType()) {
5526 ExprResult result = CheckPlaceholderExpr(E);
5527 if (result.isInvalid()) return Owned(E);
5532 // [Except in specific positions,] an lvalue that does not have
5533 // array type is converted to the value stored in the
5534 // designated object (and is no longer an lvalue).
5535 if (E->isRValue()) {
5536 // In C, function designators (i.e. expressions of function type)
5537 // are r-values, but we still want to do function-to-pointer decay
5538 // on them. This is both technically correct and convenient for
5540 if (!getLangOpts().CPlusPlus && E->getType()->isFunctionType())
5541 return DefaultFunctionArrayConversion(E);
5546 if (getLangOpts().CPlusPlus) {
5547 // The C++11 standard defines the notion of a discarded-value expression;
5548 // normally, we don't need to do anything to handle it, but if it is a
5549 // volatile lvalue with a special form, we perform an lvalue-to-rvalue
5551 if (getLangOpts().CPlusPlus11 && E->isGLValue() &&
5552 E->getType().isVolatileQualified() &&
5553 IsSpecialDiscardedValue(E)) {
5554 ExprResult Res = DefaultLvalueConversion(E);
5555 if (Res.isInvalid())
5562 // GCC seems to also exclude expressions of incomplete enum type.
5563 if (const EnumType *T = E->getType()->getAs<EnumType>()) {
5564 if (!T->getDecl()->isComplete()) {
5565 // FIXME: stupid workaround for a codegen bug!
5566 E = ImpCastExprToType(E, Context.VoidTy, CK_ToVoid).take();
5571 ExprResult Res = DefaultFunctionArrayLvalueConversion(E);
5572 if (Res.isInvalid())
5576 if (!E->getType()->isVoidType())
5577 RequireCompleteType(E->getExprLoc(), E->getType(),
5578 diag::err_incomplete_type);
5582 ExprResult Sema::ActOnFinishFullExpr(Expr *FE, SourceLocation CC,
5583 bool DiscardedValue,
5585 ExprResult FullExpr = Owned(FE);
5587 if (!FullExpr.get())
5590 if (DiagnoseUnexpandedParameterPack(FullExpr.get()))
5593 // Top-level expressions default to 'id' when we're in a debugger.
5594 if (DiscardedValue && getLangOpts().DebuggerCastResultToId &&
5595 FullExpr.get()->getType() == Context.UnknownAnyTy) {
5596 FullExpr = forceUnknownAnyToType(FullExpr.take(), Context.getObjCIdType());
5597 if (FullExpr.isInvalid())
5601 if (DiscardedValue) {
5602 FullExpr = CheckPlaceholderExpr(FullExpr.take());
5603 if (FullExpr.isInvalid())
5606 FullExpr = IgnoredValueConversions(FullExpr.take());
5607 if (FullExpr.isInvalid())
5611 CheckCompletedExpr(FullExpr.get(), CC, IsConstexpr);
5612 return MaybeCreateExprWithCleanups(FullExpr);
5615 StmtResult Sema::ActOnFinishFullStmt(Stmt *FullStmt) {
5616 if (!FullStmt) return StmtError();
5618 return MaybeCreateStmtWithCleanups(FullStmt);
5621 Sema::IfExistsResult
5622 Sema::CheckMicrosoftIfExistsSymbol(Scope *S,
5624 const DeclarationNameInfo &TargetNameInfo) {
5625 DeclarationName TargetName = TargetNameInfo.getName();
5627 return IER_DoesNotExist;
5629 // If the name itself is dependent, then the result is dependent.
5630 if (TargetName.isDependentName())
5631 return IER_Dependent;
5633 // Do the redeclaration lookup in the current scope.
5634 LookupResult R(*this, TargetNameInfo, Sema::LookupAnyName,
5635 Sema::NotForRedeclaration);
5636 LookupParsedName(R, S, &SS);
5637 R.suppressDiagnostics();
5639 switch (R.getResultKind()) {
5640 case LookupResult::Found:
5641 case LookupResult::FoundOverloaded:
5642 case LookupResult::FoundUnresolvedValue:
5643 case LookupResult::Ambiguous:
5646 case LookupResult::NotFound:
5647 return IER_DoesNotExist;
5649 case LookupResult::NotFoundInCurrentInstantiation:
5650 return IER_Dependent;
5653 llvm_unreachable("Invalid LookupResult Kind!");
5656 Sema::IfExistsResult
5657 Sema::CheckMicrosoftIfExistsSymbol(Scope *S, SourceLocation KeywordLoc,
5658 bool IsIfExists, CXXScopeSpec &SS,
5659 UnqualifiedId &Name) {
5660 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name);
5662 // Check for unexpanded parameter packs.
5663 SmallVector<UnexpandedParameterPack, 4> Unexpanded;
5664 collectUnexpandedParameterPacks(SS, Unexpanded);
5665 collectUnexpandedParameterPacks(TargetNameInfo, Unexpanded);
5666 if (!Unexpanded.empty()) {
5667 DiagnoseUnexpandedParameterPacks(KeywordLoc,
5668 IsIfExists? UPPC_IfExists
5674 return CheckMicrosoftIfExistsSymbol(S, SS, TargetNameInfo);