1 //===--- SemaExprCXX.cpp - Semantic Analysis for Expressions --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements semantic analysis for C++ expressions.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Sema/SemaInternal.h"
15 #include "clang/Sema/DeclSpec.h"
16 #include "clang/Sema/Initialization.h"
17 #include "clang/Sema/Lookup.h"
18 #include "clang/Sema/ParsedTemplate.h"
19 #include "clang/Sema/ScopeInfo.h"
20 #include "clang/Sema/Scope.h"
21 #include "clang/Sema/TemplateDeduction.h"
22 #include "clang/AST/ASTContext.h"
23 #include "clang/AST/CXXInheritance.h"
24 #include "clang/AST/DeclObjC.h"
25 #include "clang/AST/ExprCXX.h"
26 #include "clang/AST/ExprObjC.h"
27 #include "clang/AST/TypeLoc.h"
28 #include "clang/Basic/PartialDiagnostic.h"
29 #include "clang/Basic/TargetInfo.h"
30 #include "clang/Lex/Preprocessor.h"
31 #include "llvm/ADT/STLExtras.h"
32 #include "llvm/Support/ErrorHandling.h"
33 using namespace clang;
36 ParsedType Sema::getDestructorName(SourceLocation TildeLoc,
38 SourceLocation NameLoc,
39 Scope *S, CXXScopeSpec &SS,
40 ParsedType ObjectTypePtr,
41 bool EnteringContext) {
42 // Determine where to perform name lookup.
44 // FIXME: This area of the standard is very messy, and the current
45 // wording is rather unclear about which scopes we search for the
46 // destructor name; see core issues 399 and 555. Issue 399 in
47 // particular shows where the current description of destructor name
48 // lookup is completely out of line with existing practice, e.g.,
49 // this appears to be ill-formed:
52 // template <typename T> struct S {
57 // void f(N::S<int>* s) {
58 // s->N::S<int>::~S();
61 // See also PR6358 and PR6359.
62 // For this reason, we're currently only doing the C++03 version of this
63 // code; the C++0x version has to wait until we get a proper spec.
65 DeclContext *LookupCtx = 0;
66 bool isDependent = false;
67 bool LookInScope = false;
69 // If we have an object type, it's because we are in a
70 // pseudo-destructor-expression or a member access expression, and
71 // we know what type we're looking for.
73 SearchType = GetTypeFromParser(ObjectTypePtr);
76 NestedNameSpecifier *NNS = (NestedNameSpecifier *)SS.getScopeRep();
78 bool AlreadySearched = false;
79 bool LookAtPrefix = true;
80 // C++ [basic.lookup.qual]p6:
81 // If a pseudo-destructor-name (5.2.4) contains a nested-name-specifier,
82 // the type-names are looked up as types in the scope designated by the
83 // nested-name-specifier. In a qualified-id of the form:
85 // ::[opt] nested-name-specifier ~ class-name
87 // where the nested-name-specifier designates a namespace scope, and in
88 // a qualified-id of the form:
90 // ::opt nested-name-specifier class-name :: ~ class-name
92 // the class-names are looked up as types in the scope designated by
93 // the nested-name-specifier.
95 // Here, we check the first case (completely) and determine whether the
96 // code below is permitted to look at the prefix of the
97 // nested-name-specifier.
98 DeclContext *DC = computeDeclContext(SS, EnteringContext);
99 if (DC && DC->isFileContext()) {
100 AlreadySearched = true;
103 } else if (DC && isa<CXXRecordDecl>(DC))
104 LookAtPrefix = false;
106 // The second case from the C++03 rules quoted further above.
107 NestedNameSpecifier *Prefix = 0;
108 if (AlreadySearched) {
109 // Nothing left to do.
110 } else if (LookAtPrefix && (Prefix = NNS->getPrefix())) {
111 CXXScopeSpec PrefixSS;
112 PrefixSS.Adopt(NestedNameSpecifierLoc(Prefix, SS.location_data()));
113 LookupCtx = computeDeclContext(PrefixSS, EnteringContext);
114 isDependent = isDependentScopeSpecifier(PrefixSS);
115 } else if (ObjectTypePtr) {
116 LookupCtx = computeDeclContext(SearchType);
117 isDependent = SearchType->isDependentType();
119 LookupCtx = computeDeclContext(SS, EnteringContext);
120 isDependent = LookupCtx && LookupCtx->isDependentContext();
124 } else if (ObjectTypePtr) {
125 // C++ [basic.lookup.classref]p3:
126 // If the unqualified-id is ~type-name, the type-name is looked up
127 // in the context of the entire postfix-expression. If the type T
128 // of the object expression is of a class type C, the type-name is
129 // also looked up in the scope of class C. At least one of the
130 // lookups shall find a name that refers to (possibly
132 LookupCtx = computeDeclContext(SearchType);
133 isDependent = SearchType->isDependentType();
134 assert((isDependent || !SearchType->isIncompleteType()) &&
135 "Caller should have completed object type");
139 // Perform lookup into the current scope (only).
143 TypeDecl *NonMatchingTypeDecl = 0;
144 LookupResult Found(*this, &II, NameLoc, LookupOrdinaryName);
145 for (unsigned Step = 0; Step != 2; ++Step) {
146 // Look for the name first in the computed lookup context (if we
147 // have one) and, if that fails to find a match, in the scope (if
148 // we're allowed to look there).
150 if (Step == 0 && LookupCtx)
151 LookupQualifiedName(Found, LookupCtx);
152 else if (Step == 1 && LookInScope && S)
153 LookupName(Found, S);
157 // FIXME: Should we be suppressing ambiguities here?
158 if (Found.isAmbiguous())
161 if (TypeDecl *Type = Found.getAsSingle<TypeDecl>()) {
162 QualType T = Context.getTypeDeclType(Type);
164 if (SearchType.isNull() || SearchType->isDependentType() ||
165 Context.hasSameUnqualifiedType(T, SearchType)) {
166 // We found our type!
168 return ParsedType::make(T);
171 if (!SearchType.isNull())
172 NonMatchingTypeDecl = Type;
175 // If the name that we found is a class template name, and it is
176 // the same name as the template name in the last part of the
177 // nested-name-specifier (if present) or the object type, then
178 // this is the destructor for that class.
179 // FIXME: This is a workaround until we get real drafting for core
180 // issue 399, for which there isn't even an obvious direction.
181 if (ClassTemplateDecl *Template = Found.getAsSingle<ClassTemplateDecl>()) {
182 QualType MemberOfType;
184 if (DeclContext *Ctx = computeDeclContext(SS, EnteringContext)) {
185 // Figure out the type of the context, if it has one.
186 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx))
187 MemberOfType = Context.getTypeDeclType(Record);
190 if (MemberOfType.isNull())
191 MemberOfType = SearchType;
193 if (MemberOfType.isNull())
196 // We're referring into a class template specialization. If the
197 // class template we found is the same as the template being
198 // specialized, we found what we are looking for.
199 if (const RecordType *Record = MemberOfType->getAs<RecordType>()) {
200 if (ClassTemplateSpecializationDecl *Spec
201 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) {
202 if (Spec->getSpecializedTemplate()->getCanonicalDecl() ==
203 Template->getCanonicalDecl())
204 return ParsedType::make(MemberOfType);
210 // We're referring to an unresolved class template
211 // specialization. Determine whether we class template we found
212 // is the same as the template being specialized or, if we don't
213 // know which template is being specialized, that it at least
214 // has the same name.
215 if (const TemplateSpecializationType *SpecType
216 = MemberOfType->getAs<TemplateSpecializationType>()) {
217 TemplateName SpecName = SpecType->getTemplateName();
219 // The class template we found is the same template being
221 if (TemplateDecl *SpecTemplate = SpecName.getAsTemplateDecl()) {
222 if (SpecTemplate->getCanonicalDecl() == Template->getCanonicalDecl())
223 return ParsedType::make(MemberOfType);
228 // The class template we found has the same name as the
229 // (dependent) template name being specialized.
230 if (DependentTemplateName *DepTemplate
231 = SpecName.getAsDependentTemplateName()) {
232 if (DepTemplate->isIdentifier() &&
233 DepTemplate->getIdentifier() == Template->getIdentifier())
234 return ParsedType::make(MemberOfType);
243 // We didn't find our type, but that's okay: it's dependent
246 // FIXME: What if we have no nested-name-specifier?
247 QualType T = CheckTypenameType(ETK_None, SourceLocation(),
248 SS.getWithLocInContext(Context),
250 return ParsedType::make(T);
253 if (NonMatchingTypeDecl) {
254 QualType T = Context.getTypeDeclType(NonMatchingTypeDecl);
255 Diag(NameLoc, diag::err_destructor_expr_type_mismatch)
257 Diag(NonMatchingTypeDecl->getLocation(), diag::note_destructor_type_here)
259 } else if (ObjectTypePtr)
260 Diag(NameLoc, diag::err_ident_in_dtor_not_a_type)
263 Diag(NameLoc, diag::err_destructor_class_name);
268 /// \brief Build a C++ typeid expression with a type operand.
269 ExprResult Sema::BuildCXXTypeId(QualType TypeInfoType,
270 SourceLocation TypeidLoc,
271 TypeSourceInfo *Operand,
272 SourceLocation RParenLoc) {
273 // C++ [expr.typeid]p4:
274 // The top-level cv-qualifiers of the lvalue expression or the type-id
275 // that is the operand of typeid are always ignored.
276 // If the type of the type-id is a class type or a reference to a class
277 // type, the class shall be completely-defined.
280 = Context.getUnqualifiedArrayType(Operand->getType().getNonReferenceType(),
282 if (T->getAs<RecordType>() &&
283 RequireCompleteType(TypeidLoc, T, diag::err_incomplete_typeid))
286 return Owned(new (Context) CXXTypeidExpr(TypeInfoType.withConst(),
288 SourceRange(TypeidLoc, RParenLoc)));
291 /// \brief Build a C++ typeid expression with an expression operand.
292 ExprResult Sema::BuildCXXTypeId(QualType TypeInfoType,
293 SourceLocation TypeidLoc,
295 SourceLocation RParenLoc) {
296 bool isUnevaluatedOperand = true;
297 if (E && !E->isTypeDependent()) {
298 if (E->getType()->isPlaceholderType()) {
299 ExprResult result = CheckPlaceholderExpr(E);
300 if (result.isInvalid()) return ExprError();
304 QualType T = E->getType();
305 if (const RecordType *RecordT = T->getAs<RecordType>()) {
306 CXXRecordDecl *RecordD = cast<CXXRecordDecl>(RecordT->getDecl());
307 // C++ [expr.typeid]p3:
308 // [...] If the type of the expression is a class type, the class
309 // shall be completely-defined.
310 if (RequireCompleteType(TypeidLoc, T, diag::err_incomplete_typeid))
313 // C++ [expr.typeid]p3:
314 // When typeid is applied to an expression other than an glvalue of a
315 // polymorphic class type [...] [the] expression is an unevaluated
317 if (RecordD->isPolymorphic() && E->Classify(Context).isGLValue()) {
318 isUnevaluatedOperand = false;
320 // We require a vtable to query the type at run time.
321 MarkVTableUsed(TypeidLoc, RecordD);
325 // C++ [expr.typeid]p4:
326 // [...] If the type of the type-id is a reference to a possibly
327 // cv-qualified type, the result of the typeid expression refers to a
328 // std::type_info object representing the cv-unqualified referenced
331 QualType UnqualT = Context.getUnqualifiedArrayType(T, Quals);
332 if (!Context.hasSameType(T, UnqualT)) {
334 E = ImpCastExprToType(E, UnqualT, CK_NoOp, E->getValueKind()).take();
338 // If this is an unevaluated operand, clear out the set of
339 // declaration references we have been computing and eliminate any
340 // temporaries introduced in its computation.
341 if (isUnevaluatedOperand)
342 ExprEvalContexts.back().Context = Unevaluated;
344 return Owned(new (Context) CXXTypeidExpr(TypeInfoType.withConst(),
346 SourceRange(TypeidLoc, RParenLoc)));
349 /// ActOnCXXTypeidOfType - Parse typeid( type-id ) or typeid (expression);
351 Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc,
352 bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
353 // Find the std::type_info type.
354 if (!getStdNamespace())
355 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
357 if (!CXXTypeInfoDecl) {
358 IdentifierInfo *TypeInfoII = &PP.getIdentifierTable().get("type_info");
359 LookupResult R(*this, TypeInfoII, SourceLocation(), LookupTagName);
360 LookupQualifiedName(R, getStdNamespace());
361 CXXTypeInfoDecl = R.getAsSingle<RecordDecl>();
362 if (!CXXTypeInfoDecl)
363 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
366 QualType TypeInfoType = Context.getTypeDeclType(CXXTypeInfoDecl);
369 // The operand is a type; handle it as such.
370 TypeSourceInfo *TInfo = 0;
371 QualType T = GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrExpr),
377 TInfo = Context.getTrivialTypeSourceInfo(T, OpLoc);
379 return BuildCXXTypeId(TypeInfoType, OpLoc, TInfo, RParenLoc);
382 // The operand is an expression.
383 return BuildCXXTypeId(TypeInfoType, OpLoc, (Expr*)TyOrExpr, RParenLoc);
386 /// Retrieve the UuidAttr associated with QT.
387 static UuidAttr *GetUuidAttrOfType(QualType QT) {
388 // Optionally remove one level of pointer, reference or array indirection.
389 const Type *Ty = QT.getTypePtr();;
390 if (QT->isPointerType() || QT->isReferenceType())
391 Ty = QT->getPointeeType().getTypePtr();
392 else if (QT->isArrayType())
393 Ty = cast<ArrayType>(QT)->getElementType().getTypePtr();
395 // Loop all record redeclaration looking for an uuid attribute.
396 CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
397 for (CXXRecordDecl::redecl_iterator I = RD->redecls_begin(),
398 E = RD->redecls_end(); I != E; ++I) {
399 if (UuidAttr *Uuid = I->getAttr<UuidAttr>())
406 /// \brief Build a Microsoft __uuidof expression with a type operand.
407 ExprResult Sema::BuildCXXUuidof(QualType TypeInfoType,
408 SourceLocation TypeidLoc,
409 TypeSourceInfo *Operand,
410 SourceLocation RParenLoc) {
411 if (!Operand->getType()->isDependentType()) {
412 if (!GetUuidAttrOfType(Operand->getType()))
413 return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid));
416 // FIXME: add __uuidof semantic analysis for type operand.
417 return Owned(new (Context) CXXUuidofExpr(TypeInfoType.withConst(),
419 SourceRange(TypeidLoc, RParenLoc)));
422 /// \brief Build a Microsoft __uuidof expression with an expression operand.
423 ExprResult Sema::BuildCXXUuidof(QualType TypeInfoType,
424 SourceLocation TypeidLoc,
426 SourceLocation RParenLoc) {
427 if (!E->getType()->isDependentType()) {
428 if (!GetUuidAttrOfType(E->getType()) &&
429 !E->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull))
430 return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid));
432 // FIXME: add __uuidof semantic analysis for type operand.
433 return Owned(new (Context) CXXUuidofExpr(TypeInfoType.withConst(),
435 SourceRange(TypeidLoc, RParenLoc)));
438 /// ActOnCXXUuidof - Parse __uuidof( type-id ) or __uuidof (expression);
440 Sema::ActOnCXXUuidof(SourceLocation OpLoc, SourceLocation LParenLoc,
441 bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
442 // If MSVCGuidDecl has not been cached, do the lookup.
444 IdentifierInfo *GuidII = &PP.getIdentifierTable().get("_GUID");
445 LookupResult R(*this, GuidII, SourceLocation(), LookupTagName);
446 LookupQualifiedName(R, Context.getTranslationUnitDecl());
447 MSVCGuidDecl = R.getAsSingle<RecordDecl>();
449 return ExprError(Diag(OpLoc, diag::err_need_header_before_ms_uuidof));
452 QualType GuidType = Context.getTypeDeclType(MSVCGuidDecl);
455 // The operand is a type; handle it as such.
456 TypeSourceInfo *TInfo = 0;
457 QualType T = GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrExpr),
463 TInfo = Context.getTrivialTypeSourceInfo(T, OpLoc);
465 return BuildCXXUuidof(GuidType, OpLoc, TInfo, RParenLoc);
468 // The operand is an expression.
469 return BuildCXXUuidof(GuidType, OpLoc, (Expr*)TyOrExpr, RParenLoc);
472 /// ActOnCXXBoolLiteral - Parse {true,false} literals.
474 Sema::ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
475 assert((Kind == tok::kw_true || Kind == tok::kw_false) &&
476 "Unknown C++ Boolean value!");
477 return Owned(new (Context) CXXBoolLiteralExpr(Kind == tok::kw_true,
478 Context.BoolTy, OpLoc));
481 /// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
483 Sema::ActOnCXXNullPtrLiteral(SourceLocation Loc) {
484 return Owned(new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc));
487 /// ActOnCXXThrow - Parse throw expressions.
489 Sema::ActOnCXXThrow(Scope *S, SourceLocation OpLoc, Expr *Ex) {
490 bool IsThrownVarInScope = false;
492 // C++0x [class.copymove]p31:
493 // When certain criteria are met, an implementation is allowed to omit the
494 // copy/move construction of a class object [...]
496 // - in a throw-expression, when the operand is the name of a
497 // non-volatile automatic object (other than a function or catch-
498 // clause parameter) whose scope does not extend beyond the end of the
499 // innermost enclosing try-block (if there is one), the copy/move
500 // operation from the operand to the exception object (15.1) can be
501 // omitted by constructing the automatic object directly into the
503 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Ex->IgnoreParens()))
504 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
505 if (Var->hasLocalStorage() && !Var->getType().isVolatileQualified()) {
506 for( ; S; S = S->getParent()) {
507 if (S->isDeclScope(Var)) {
508 IsThrownVarInScope = true;
513 (Scope::FnScope | Scope::ClassScope | Scope::BlockScope |
514 Scope::FunctionPrototypeScope | Scope::ObjCMethodScope |
522 return BuildCXXThrow(OpLoc, Ex, IsThrownVarInScope);
525 ExprResult Sema::BuildCXXThrow(SourceLocation OpLoc, Expr *Ex,
526 bool IsThrownVarInScope) {
527 // Don't report an error if 'throw' is used in system headers.
528 if (!getLangOptions().CXXExceptions &&
529 !getSourceManager().isInSystemHeader(OpLoc))
530 Diag(OpLoc, diag::err_exceptions_disabled) << "throw";
532 if (Ex && !Ex->isTypeDependent()) {
533 ExprResult ExRes = CheckCXXThrowOperand(OpLoc, Ex, IsThrownVarInScope);
534 if (ExRes.isInvalid())
539 return Owned(new (Context) CXXThrowExpr(Ex, Context.VoidTy, OpLoc,
540 IsThrownVarInScope));
543 /// CheckCXXThrowOperand - Validate the operand of a throw.
544 ExprResult Sema::CheckCXXThrowOperand(SourceLocation ThrowLoc, Expr *E,
545 bool IsThrownVarInScope) {
546 // C++ [except.throw]p3:
547 // A throw-expression initializes a temporary object, called the exception
548 // object, the type of which is determined by removing any top-level
549 // cv-qualifiers from the static type of the operand of throw and adjusting
550 // the type from "array of T" or "function returning T" to "pointer to T"
551 // or "pointer to function returning T", [...]
552 if (E->getType().hasQualifiers())
553 E = ImpCastExprToType(E, E->getType().getUnqualifiedType(), CK_NoOp,
554 E->getValueKind()).take();
556 ExprResult Res = DefaultFunctionArrayConversion(E);
561 // If the type of the exception would be an incomplete type or a pointer
562 // to an incomplete type other than (cv) void the program is ill-formed.
563 QualType Ty = E->getType();
564 bool isPointer = false;
565 if (const PointerType* Ptr = Ty->getAs<PointerType>()) {
566 Ty = Ptr->getPointeeType();
569 if (!isPointer || !Ty->isVoidType()) {
570 if (RequireCompleteType(ThrowLoc, Ty,
571 PDiag(isPointer ? diag::err_throw_incomplete_ptr
572 : diag::err_throw_incomplete)
573 << E->getSourceRange()))
576 if (RequireNonAbstractType(ThrowLoc, E->getType(),
577 PDiag(diag::err_throw_abstract_type)
578 << E->getSourceRange()))
582 // Initialize the exception result. This implicitly weeds out
583 // abstract types or types with inaccessible copy constructors.
585 // C++0x [class.copymove]p31:
586 // When certain criteria are met, an implementation is allowed to omit the
587 // copy/move construction of a class object [...]
589 // - in a throw-expression, when the operand is the name of a
590 // non-volatile automatic object (other than a function or catch-clause
591 // parameter) whose scope does not extend beyond the end of the
592 // innermost enclosing try-block (if there is one), the copy/move
593 // operation from the operand to the exception object (15.1) can be
594 // omitted by constructing the automatic object directly into the
596 const VarDecl *NRVOVariable = 0;
597 if (IsThrownVarInScope)
598 NRVOVariable = getCopyElisionCandidate(QualType(), E, false);
600 InitializedEntity Entity =
601 InitializedEntity::InitializeException(ThrowLoc, E->getType(),
602 /*NRVO=*/NRVOVariable != 0);
603 Res = PerformMoveOrCopyInitialization(Entity, NRVOVariable,
610 // If the exception has class type, we need additional handling.
611 const RecordType *RecordTy = Ty->getAs<RecordType>();
614 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl());
616 // If we are throwing a polymorphic class type or pointer thereof,
617 // exception handling will make use of the vtable.
618 MarkVTableUsed(ThrowLoc, RD);
620 // If a pointer is thrown, the referenced object will not be destroyed.
624 // If the class has a non-trivial destructor, we must be able to call it.
625 if (RD->hasTrivialDestructor())
628 CXXDestructorDecl *Destructor
629 = const_cast<CXXDestructorDecl*>(LookupDestructor(RD));
633 MarkDeclarationReferenced(E->getExprLoc(), Destructor);
634 CheckDestructorAccess(E->getExprLoc(), Destructor,
635 PDiag(diag::err_access_dtor_exception) << Ty);
639 QualType Sema::getAndCaptureCurrentThisType() {
640 // Ignore block scopes: we can capture through them.
641 // Ignore nested enum scopes: we'll diagnose non-constant expressions
642 // where they're invalid, and other uses are legitimate.
643 // Don't ignore nested class scopes: you can't use 'this' in a local class.
644 DeclContext *DC = CurContext;
645 unsigned NumBlocks = 0;
647 if (isa<BlockDecl>(DC)) {
648 DC = cast<BlockDecl>(DC)->getDeclContext();
650 } else if (isa<EnumDecl>(DC))
651 DC = cast<EnumDecl>(DC)->getDeclContext();
656 if (CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(DC)) {
657 if (method && method->isInstance())
658 ThisTy = method->getThisType(Context);
659 } else if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) {
660 // C++0x [expr.prim]p4:
661 // Otherwise, if a member-declarator declares a non-static data member
662 // of a class X, the expression this is a prvalue of type "pointer to X"
663 // within the optional brace-or-equal-initializer.
664 Scope *S = getScopeForContext(DC);
665 if (!S || S->getFlags() & Scope::ThisScope)
666 ThisTy = Context.getPointerType(Context.getRecordType(RD));
669 // Mark that we're closing on 'this' in all the block scopes we ignored.
670 if (!ThisTy.isNull())
671 for (unsigned idx = FunctionScopes.size() - 1;
672 NumBlocks; --idx, --NumBlocks)
673 cast<BlockScopeInfo>(FunctionScopes[idx])->CapturesCXXThis = true;
678 ExprResult Sema::ActOnCXXThis(SourceLocation Loc) {
679 /// C++ 9.3.2: In the body of a non-static member function, the keyword this
680 /// is a non-lvalue expression whose value is the address of the object for
681 /// which the function is called.
683 QualType ThisTy = getAndCaptureCurrentThisType();
684 if (ThisTy.isNull()) return Diag(Loc, diag::err_invalid_this_use);
686 return Owned(new (Context) CXXThisExpr(Loc, ThisTy, /*isImplicit=*/false));
690 Sema::ActOnCXXTypeConstructExpr(ParsedType TypeRep,
691 SourceLocation LParenLoc,
693 SourceLocation RParenLoc) {
697 TypeSourceInfo *TInfo;
698 QualType Ty = GetTypeFromParser(TypeRep, &TInfo);
700 TInfo = Context.getTrivialTypeSourceInfo(Ty, SourceLocation());
702 return BuildCXXTypeConstructExpr(TInfo, LParenLoc, exprs, RParenLoc);
705 /// ActOnCXXTypeConstructExpr - Parse construction of a specified type.
706 /// Can be interpreted either as function-style casting ("int(x)")
707 /// or class type construction ("ClassType(x,y,z)")
708 /// or creation of a value-initialized type ("int()").
710 Sema::BuildCXXTypeConstructExpr(TypeSourceInfo *TInfo,
711 SourceLocation LParenLoc,
713 SourceLocation RParenLoc) {
714 QualType Ty = TInfo->getType();
715 unsigned NumExprs = exprs.size();
716 Expr **Exprs = (Expr**)exprs.get();
717 SourceLocation TyBeginLoc = TInfo->getTypeLoc().getBeginLoc();
718 SourceRange FullRange = SourceRange(TyBeginLoc, RParenLoc);
720 if (Ty->isDependentType() ||
721 CallExpr::hasAnyTypeDependentArguments(Exprs, NumExprs)) {
724 return Owned(CXXUnresolvedConstructExpr::Create(Context, TInfo,
730 if (Ty->isArrayType())
731 return ExprError(Diag(TyBeginLoc,
732 diag::err_value_init_for_array_type) << FullRange);
733 if (!Ty->isVoidType() &&
734 RequireCompleteType(TyBeginLoc, Ty,
735 PDiag(diag::err_invalid_incomplete_type_use)
739 if (RequireNonAbstractType(TyBeginLoc, Ty,
740 diag::err_allocation_of_abstract_type))
744 // C++ [expr.type.conv]p1:
745 // If the expression list is a single expression, the type conversion
746 // expression is equivalent (in definedness, and if defined in meaning) to the
747 // corresponding cast expression.
749 Expr *Arg = Exprs[0];
751 return BuildCXXFunctionalCastExpr(TInfo, LParenLoc, Arg, RParenLoc);
754 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TInfo);
755 InitializationKind Kind
756 = NumExprs ? InitializationKind::CreateDirect(TyBeginLoc,
757 LParenLoc, RParenLoc)
758 : InitializationKind::CreateValue(TyBeginLoc,
759 LParenLoc, RParenLoc);
760 InitializationSequence InitSeq(*this, Entity, Kind, Exprs, NumExprs);
761 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(exprs));
763 // FIXME: Improve AST representation?
767 /// doesUsualArrayDeleteWantSize - Answers whether the usual
768 /// operator delete[] for the given type has a size_t parameter.
769 static bool doesUsualArrayDeleteWantSize(Sema &S, SourceLocation loc,
770 QualType allocType) {
771 const RecordType *record =
772 allocType->getBaseElementTypeUnsafe()->getAs<RecordType>();
773 if (!record) return false;
775 // Try to find an operator delete[] in class scope.
777 DeclarationName deleteName =
778 S.Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete);
779 LookupResult ops(S, deleteName, loc, Sema::LookupOrdinaryName);
780 S.LookupQualifiedName(ops, record->getDecl());
782 // We're just doing this for information.
783 ops.suppressDiagnostics();
785 // Very likely: there's no operator delete[].
786 if (ops.empty()) return false;
788 // If it's ambiguous, it should be illegal to call operator delete[]
789 // on this thing, so it doesn't matter if we allocate extra space or not.
790 if (ops.isAmbiguous()) return false;
792 LookupResult::Filter filter = ops.makeFilter();
793 while (filter.hasNext()) {
794 NamedDecl *del = filter.next()->getUnderlyingDecl();
796 // C++0x [basic.stc.dynamic.deallocation]p2:
797 // A template instance is never a usual deallocation function,
798 // regardless of its signature.
799 if (isa<FunctionTemplateDecl>(del)) {
804 // C++0x [basic.stc.dynamic.deallocation]p2:
805 // If class T does not declare [an operator delete[] with one
806 // parameter] but does declare a member deallocation function
807 // named operator delete[] with exactly two parameters, the
808 // second of which has type std::size_t, then this function
809 // is a usual deallocation function.
810 if (!cast<CXXMethodDecl>(del)->isUsualDeallocationFunction()) {
817 if (!ops.isSingleResult()) return false;
819 const FunctionDecl *del = cast<FunctionDecl>(ops.getFoundDecl());
820 return (del->getNumParams() == 2);
823 /// ActOnCXXNew - Parsed a C++ 'new' expression (C++ 5.3.4), as in e.g.:
824 /// @code new (memory) int[size][4] @endcode
826 /// @code ::new Foo(23, "hello") @endcode
827 /// For the interpretation of this heap of arguments, consult the base version.
829 Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
830 SourceLocation PlacementLParen, MultiExprArg PlacementArgs,
831 SourceLocation PlacementRParen, SourceRange TypeIdParens,
832 Declarator &D, SourceLocation ConstructorLParen,
833 MultiExprArg ConstructorArgs,
834 SourceLocation ConstructorRParen) {
835 bool TypeContainsAuto = D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto;
838 // If the specified type is an array, unwrap it and save the expression.
839 if (D.getNumTypeObjects() > 0 &&
840 D.getTypeObject(0).Kind == DeclaratorChunk::Array) {
841 DeclaratorChunk &Chunk = D.getTypeObject(0);
842 if (TypeContainsAuto)
843 return ExprError(Diag(Chunk.Loc, diag::err_new_array_of_auto)
844 << D.getSourceRange());
845 if (Chunk.Arr.hasStatic)
846 return ExprError(Diag(Chunk.Loc, diag::err_static_illegal_in_new)
847 << D.getSourceRange());
848 if (!Chunk.Arr.NumElts)
849 return ExprError(Diag(Chunk.Loc, diag::err_array_new_needs_size)
850 << D.getSourceRange());
852 ArraySize = static_cast<Expr*>(Chunk.Arr.NumElts);
853 D.DropFirstTypeObject();
856 // Every dimension shall be of constant size.
858 for (unsigned I = 0, N = D.getNumTypeObjects(); I < N; ++I) {
859 if (D.getTypeObject(I).Kind != DeclaratorChunk::Array)
862 DeclaratorChunk::ArrayTypeInfo &Array = D.getTypeObject(I).Arr;
863 if (Expr *NumElts = (Expr *)Array.NumElts) {
864 if (!NumElts->isTypeDependent() && !NumElts->isValueDependent() &&
865 !NumElts->isIntegerConstantExpr(Context)) {
866 Diag(D.getTypeObject(I).Loc, diag::err_new_array_nonconst)
867 << NumElts->getSourceRange();
874 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, /*Scope=*/0);
875 QualType AllocType = TInfo->getType();
876 if (D.isInvalidType())
879 return BuildCXXNew(StartLoc, UseGlobal,
888 move(ConstructorArgs),
894 Sema::BuildCXXNew(SourceLocation StartLoc, bool UseGlobal,
895 SourceLocation PlacementLParen,
896 MultiExprArg PlacementArgs,
897 SourceLocation PlacementRParen,
898 SourceRange TypeIdParens,
900 TypeSourceInfo *AllocTypeInfo,
902 SourceLocation ConstructorLParen,
903 MultiExprArg ConstructorArgs,
904 SourceLocation ConstructorRParen,
905 bool TypeMayContainAuto) {
906 SourceRange TypeRange = AllocTypeInfo->getTypeLoc().getSourceRange();
908 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for.
909 if (TypeMayContainAuto && AllocType->getContainedAutoType()) {
910 if (ConstructorArgs.size() == 0)
911 return ExprError(Diag(StartLoc, diag::err_auto_new_requires_ctor_arg)
912 << AllocType << TypeRange);
913 if (ConstructorArgs.size() != 1) {
914 Expr *FirstBad = ConstructorArgs.get()[1];
915 return ExprError(Diag(FirstBad->getSourceRange().getBegin(),
916 diag::err_auto_new_ctor_multiple_expressions)
917 << AllocType << TypeRange);
919 TypeSourceInfo *DeducedType = 0;
920 if (!DeduceAutoType(AllocTypeInfo, ConstructorArgs.get()[0], DeducedType))
921 return ExprError(Diag(StartLoc, diag::err_auto_new_deduction_failure)
923 << ConstructorArgs.get()[0]->getType()
925 << ConstructorArgs.get()[0]->getSourceRange());
929 AllocTypeInfo = DeducedType;
930 AllocType = AllocTypeInfo->getType();
933 // Per C++0x [expr.new]p5, the type being constructed may be a
934 // typedef of an array type.
936 if (const ConstantArrayType *Array
937 = Context.getAsConstantArrayType(AllocType)) {
938 ArraySize = IntegerLiteral::Create(Context, Array->getSize(),
939 Context.getSizeType(),
941 AllocType = Array->getElementType();
945 if (CheckAllocatedType(AllocType, TypeRange.getBegin(), TypeRange))
948 // In ARC, infer 'retaining' for the allocated
949 if (getLangOptions().ObjCAutoRefCount &&
950 AllocType.getObjCLifetime() == Qualifiers::OCL_None &&
951 AllocType->isObjCLifetimeType()) {
952 AllocType = Context.getLifetimeQualifiedType(AllocType,
953 AllocType->getObjCARCImplicitLifetime());
956 QualType ResultType = Context.getPointerType(AllocType);
958 // C++ 5.3.4p6: "The expression in a direct-new-declarator shall have integral
959 // or enumeration type with a non-negative value."
960 if (ArraySize && !ArraySize->isTypeDependent()) {
962 QualType SizeType = ArraySize->getType();
964 ExprResult ConvertedSize
965 = ConvertToIntegralOrEnumerationType(StartLoc, ArraySize,
966 PDiag(diag::err_array_size_not_integral),
967 PDiag(diag::err_array_size_incomplete_type)
968 << ArraySize->getSourceRange(),
969 PDiag(diag::err_array_size_explicit_conversion),
970 PDiag(diag::note_array_size_conversion),
971 PDiag(diag::err_array_size_ambiguous_conversion),
972 PDiag(diag::note_array_size_conversion),
973 PDiag(getLangOptions().CPlusPlus0x? 0
974 : diag::ext_array_size_conversion));
975 if (ConvertedSize.isInvalid())
978 ArraySize = ConvertedSize.take();
979 SizeType = ArraySize->getType();
980 if (!SizeType->isIntegralOrUnscopedEnumerationType())
983 // Let's see if this is a constant < 0. If so, we reject it out of hand.
984 // We don't care about special rules, so we tell the machinery it's not
985 // evaluated - it gives us a result in more cases.
986 if (!ArraySize->isValueDependent()) {
988 if (ArraySize->isIntegerConstantExpr(Value, Context, 0, false)) {
989 if (Value < llvm::APSInt(
990 llvm::APInt::getNullValue(Value.getBitWidth()),
992 return ExprError(Diag(ArraySize->getSourceRange().getBegin(),
993 diag::err_typecheck_negative_array_size)
994 << ArraySize->getSourceRange());
996 if (!AllocType->isDependentType()) {
997 unsigned ActiveSizeBits
998 = ConstantArrayType::getNumAddressingBits(Context, AllocType, Value);
999 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
1000 Diag(ArraySize->getSourceRange().getBegin(),
1001 diag::err_array_too_large)
1002 << Value.toString(10)
1003 << ArraySize->getSourceRange();
1007 } else if (TypeIdParens.isValid()) {
1008 // Can't have dynamic array size when the type-id is in parentheses.
1009 Diag(ArraySize->getLocStart(), diag::ext_new_paren_array_nonconst)
1010 << ArraySize->getSourceRange()
1011 << FixItHint::CreateRemoval(TypeIdParens.getBegin())
1012 << FixItHint::CreateRemoval(TypeIdParens.getEnd());
1014 TypeIdParens = SourceRange();
1018 // ARC: warn about ABI issues.
1019 if (getLangOptions().ObjCAutoRefCount) {
1020 QualType BaseAllocType = Context.getBaseElementType(AllocType);
1021 if (BaseAllocType.hasStrongOrWeakObjCLifetime())
1022 Diag(StartLoc, diag::warn_err_new_delete_object_array)
1023 << 0 << BaseAllocType;
1026 // Note that we do *not* convert the argument in any way. It can
1027 // be signed, larger than size_t, whatever.
1030 FunctionDecl *OperatorNew = 0;
1031 FunctionDecl *OperatorDelete = 0;
1032 Expr **PlaceArgs = (Expr**)PlacementArgs.get();
1033 unsigned NumPlaceArgs = PlacementArgs.size();
1035 if (!AllocType->isDependentType() &&
1036 !Expr::hasAnyTypeDependentArguments(PlaceArgs, NumPlaceArgs) &&
1037 FindAllocationFunctions(StartLoc,
1038 SourceRange(PlacementLParen, PlacementRParen),
1039 UseGlobal, AllocType, ArraySize, PlaceArgs,
1040 NumPlaceArgs, OperatorNew, OperatorDelete))
1043 // If this is an array allocation, compute whether the usual array
1044 // deallocation function for the type has a size_t parameter.
1045 bool UsualArrayDeleteWantsSize = false;
1046 if (ArraySize && !AllocType->isDependentType())
1047 UsualArrayDeleteWantsSize
1048 = doesUsualArrayDeleteWantSize(*this, StartLoc, AllocType);
1050 SmallVector<Expr *, 8> AllPlaceArgs;
1052 // Add default arguments, if any.
1053 const FunctionProtoType *Proto =
1054 OperatorNew->getType()->getAs<FunctionProtoType>();
1055 VariadicCallType CallType =
1056 Proto->isVariadic() ? VariadicFunction : VariadicDoesNotApply;
1058 if (GatherArgumentsForCall(PlacementLParen, OperatorNew,
1059 Proto, 1, PlaceArgs, NumPlaceArgs,
1060 AllPlaceArgs, CallType))
1063 NumPlaceArgs = AllPlaceArgs.size();
1064 if (NumPlaceArgs > 0)
1065 PlaceArgs = &AllPlaceArgs[0];
1068 bool Init = ConstructorLParen.isValid();
1069 // --- Choosing a constructor ---
1070 CXXConstructorDecl *Constructor = 0;
1071 bool HadMultipleCandidates = false;
1072 Expr **ConsArgs = (Expr**)ConstructorArgs.get();
1073 unsigned NumConsArgs = ConstructorArgs.size();
1074 ASTOwningVector<Expr*> ConvertedConstructorArgs(*this);
1076 // Array 'new' can't have any initializers.
1077 if (NumConsArgs && (ResultType->isArrayType() || ArraySize)) {
1078 SourceRange InitRange(ConsArgs[0]->getLocStart(),
1079 ConsArgs[NumConsArgs - 1]->getLocEnd());
1081 Diag(StartLoc, diag::err_new_array_init_args) << InitRange;
1085 if (!AllocType->isDependentType() &&
1086 !Expr::hasAnyTypeDependentArguments(ConsArgs, NumConsArgs)) {
1087 // C++0x [expr.new]p15:
1088 // A new-expression that creates an object of type T initializes that
1089 // object as follows:
1090 InitializationKind Kind
1091 // - If the new-initializer is omitted, the object is default-
1092 // initialized (8.5); if no initialization is performed,
1093 // the object has indeterminate value
1094 = !Init? InitializationKind::CreateDefault(TypeRange.getBegin())
1095 // - Otherwise, the new-initializer is interpreted according to the
1096 // initialization rules of 8.5 for direct-initialization.
1097 : InitializationKind::CreateDirect(TypeRange.getBegin(),
1101 InitializedEntity Entity
1102 = InitializedEntity::InitializeNew(StartLoc, AllocType);
1103 InitializationSequence InitSeq(*this, Entity, Kind, ConsArgs, NumConsArgs);
1104 ExprResult FullInit = InitSeq.Perform(*this, Entity, Kind,
1105 move(ConstructorArgs));
1106 if (FullInit.isInvalid())
1109 // FullInit is our initializer; walk through it to determine if it's a
1110 // constructor call, which CXXNewExpr handles directly.
1111 if (Expr *FullInitExpr = (Expr *)FullInit.get()) {
1112 if (CXXBindTemporaryExpr *Binder
1113 = dyn_cast<CXXBindTemporaryExpr>(FullInitExpr))
1114 FullInitExpr = Binder->getSubExpr();
1115 if (CXXConstructExpr *Construct
1116 = dyn_cast<CXXConstructExpr>(FullInitExpr)) {
1117 Constructor = Construct->getConstructor();
1118 HadMultipleCandidates = Construct->hadMultipleCandidates();
1119 for (CXXConstructExpr::arg_iterator A = Construct->arg_begin(),
1120 AEnd = Construct->arg_end();
1122 ConvertedConstructorArgs.push_back(*A);
1124 // Take the converted initializer.
1125 ConvertedConstructorArgs.push_back(FullInit.release());
1128 // No initialization required.
1131 // Take the converted arguments and use them for the new expression.
1132 NumConsArgs = ConvertedConstructorArgs.size();
1133 ConsArgs = (Expr **)ConvertedConstructorArgs.take();
1136 // Mark the new and delete operators as referenced.
1138 MarkDeclarationReferenced(StartLoc, OperatorNew);
1140 MarkDeclarationReferenced(StartLoc, OperatorDelete);
1142 // C++0x [expr.new]p17:
1143 // If the new expression creates an array of objects of class type,
1144 // access and ambiguity control are done for the destructor.
1145 if (ArraySize && Constructor) {
1146 if (CXXDestructorDecl *dtor = LookupDestructor(Constructor->getParent())) {
1147 MarkDeclarationReferenced(StartLoc, dtor);
1148 CheckDestructorAccess(StartLoc, dtor,
1149 PDiag(diag::err_access_dtor)
1150 << Context.getBaseElementType(AllocType));
1154 PlacementArgs.release();
1155 ConstructorArgs.release();
1157 return Owned(new (Context) CXXNewExpr(Context, UseGlobal, OperatorNew,
1158 PlaceArgs, NumPlaceArgs, TypeIdParens,
1159 ArraySize, Constructor, Init,
1160 ConsArgs, NumConsArgs,
1161 HadMultipleCandidates,
1163 UsualArrayDeleteWantsSize,
1164 ResultType, AllocTypeInfo,
1166 Init ? ConstructorRParen :
1168 ConstructorLParen, ConstructorRParen));
1171 /// CheckAllocatedType - Checks that a type is suitable as the allocated type
1172 /// in a new-expression.
1173 /// dimension off and stores the size expression in ArraySize.
1174 bool Sema::CheckAllocatedType(QualType AllocType, SourceLocation Loc,
1176 // C++ 5.3.4p1: "[The] type shall be a complete object type, but not an
1177 // abstract class type or array thereof.
1178 if (AllocType->isFunctionType())
1179 return Diag(Loc, diag::err_bad_new_type)
1180 << AllocType << 0 << R;
1181 else if (AllocType->isReferenceType())
1182 return Diag(Loc, diag::err_bad_new_type)
1183 << AllocType << 1 << R;
1184 else if (!AllocType->isDependentType() &&
1185 RequireCompleteType(Loc, AllocType,
1186 PDiag(diag::err_new_incomplete_type)
1189 else if (RequireNonAbstractType(Loc, AllocType,
1190 diag::err_allocation_of_abstract_type))
1192 else if (AllocType->isVariablyModifiedType())
1193 return Diag(Loc, diag::err_variably_modified_new_type)
1195 else if (unsigned AddressSpace = AllocType.getAddressSpace())
1196 return Diag(Loc, diag::err_address_space_qualified_new)
1197 << AllocType.getUnqualifiedType() << AddressSpace;
1198 else if (getLangOptions().ObjCAutoRefCount) {
1199 if (const ArrayType *AT = Context.getAsArrayType(AllocType)) {
1200 QualType BaseAllocType = Context.getBaseElementType(AT);
1201 if (BaseAllocType.getObjCLifetime() == Qualifiers::OCL_None &&
1202 BaseAllocType->isObjCLifetimeType())
1203 return Diag(Loc, diag::err_arc_new_array_without_ownership)
1211 /// \brief Determine whether the given function is a non-placement
1212 /// deallocation function.
1213 static bool isNonPlacementDeallocationFunction(FunctionDecl *FD) {
1214 if (FD->isInvalidDecl())
1217 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD))
1218 return Method->isUsualDeallocationFunction();
1220 return ((FD->getOverloadedOperator() == OO_Delete ||
1221 FD->getOverloadedOperator() == OO_Array_Delete) &&
1222 FD->getNumParams() == 1);
1225 /// FindAllocationFunctions - Finds the overloads of operator new and delete
1226 /// that are appropriate for the allocation.
1227 bool Sema::FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
1228 bool UseGlobal, QualType AllocType,
1229 bool IsArray, Expr **PlaceArgs,
1230 unsigned NumPlaceArgs,
1231 FunctionDecl *&OperatorNew,
1232 FunctionDecl *&OperatorDelete) {
1233 // --- Choosing an allocation function ---
1234 // C++ 5.3.4p8 - 14 & 18
1235 // 1) If UseGlobal is true, only look in the global scope. Else, also look
1236 // in the scope of the allocated class.
1237 // 2) If an array size is given, look for operator new[], else look for
1239 // 3) The first argument is always size_t. Append the arguments from the
1242 SmallVector<Expr*, 8> AllocArgs(1 + NumPlaceArgs);
1243 // We don't care about the actual value of this argument.
1244 // FIXME: Should the Sema create the expression and embed it in the syntax
1245 // tree? Or should the consumer just recalculate the value?
1246 IntegerLiteral Size(Context, llvm::APInt::getNullValue(
1247 Context.getTargetInfo().getPointerWidth(0)),
1248 Context.getSizeType(),
1250 AllocArgs[0] = &Size;
1251 std::copy(PlaceArgs, PlaceArgs + NumPlaceArgs, AllocArgs.begin() + 1);
1253 // C++ [expr.new]p8:
1254 // If the allocated type is a non-array type, the allocation
1255 // function's name is operator new and the deallocation function's
1256 // name is operator delete. If the allocated type is an array
1257 // type, the allocation function's name is operator new[] and the
1258 // deallocation function's name is operator delete[].
1259 DeclarationName NewName = Context.DeclarationNames.getCXXOperatorName(
1260 IsArray ? OO_Array_New : OO_New);
1261 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
1262 IsArray ? OO_Array_Delete : OO_Delete);
1264 QualType AllocElemType = Context.getBaseElementType(AllocType);
1266 if (AllocElemType->isRecordType() && !UseGlobal) {
1267 CXXRecordDecl *Record
1268 = cast<CXXRecordDecl>(AllocElemType->getAs<RecordType>()->getDecl());
1269 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0],
1270 AllocArgs.size(), Record, /*AllowMissing=*/true,
1275 // Didn't find a member overload. Look for a global one.
1276 DeclareGlobalNewDelete();
1277 DeclContext *TUDecl = Context.getTranslationUnitDecl();
1278 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0],
1279 AllocArgs.size(), TUDecl, /*AllowMissing=*/false,
1284 // We don't need an operator delete if we're running under
1286 if (!getLangOptions().Exceptions) {
1291 // FindAllocationOverload can change the passed in arguments, so we need to
1293 if (NumPlaceArgs > 0)
1294 std::copy(&AllocArgs[1], AllocArgs.end(), PlaceArgs);
1296 // C++ [expr.new]p19:
1298 // If the new-expression begins with a unary :: operator, the
1299 // deallocation function's name is looked up in the global
1300 // scope. Otherwise, if the allocated type is a class type T or an
1301 // array thereof, the deallocation function's name is looked up in
1302 // the scope of T. If this lookup fails to find the name, or if
1303 // the allocated type is not a class type or array thereof, the
1304 // deallocation function's name is looked up in the global scope.
1305 LookupResult FoundDelete(*this, DeleteName, StartLoc, LookupOrdinaryName);
1306 if (AllocElemType->isRecordType() && !UseGlobal) {
1308 = cast<CXXRecordDecl>(AllocElemType->getAs<RecordType>()->getDecl());
1309 LookupQualifiedName(FoundDelete, RD);
1311 if (FoundDelete.isAmbiguous())
1312 return true; // FIXME: clean up expressions?
1314 if (FoundDelete.empty()) {
1315 DeclareGlobalNewDelete();
1316 LookupQualifiedName(FoundDelete, Context.getTranslationUnitDecl());
1319 FoundDelete.suppressDiagnostics();
1321 SmallVector<std::pair<DeclAccessPair,FunctionDecl*>, 2> Matches;
1323 // Whether we're looking for a placement operator delete is dictated
1324 // by whether we selected a placement operator new, not by whether
1325 // we had explicit placement arguments. This matters for things like
1326 // struct A { void *operator new(size_t, int = 0); ... };
1328 bool isPlacementNew = (NumPlaceArgs > 0 || OperatorNew->param_size() != 1);
1330 if (isPlacementNew) {
1331 // C++ [expr.new]p20:
1332 // A declaration of a placement deallocation function matches the
1333 // declaration of a placement allocation function if it has the
1334 // same number of parameters and, after parameter transformations
1335 // (8.3.5), all parameter types except the first are
1338 // To perform this comparison, we compute the function type that
1339 // the deallocation function should have, and use that type both
1340 // for template argument deduction and for comparison purposes.
1342 // FIXME: this comparison should ignore CC and the like.
1343 QualType ExpectedFunctionType;
1345 const FunctionProtoType *Proto
1346 = OperatorNew->getType()->getAs<FunctionProtoType>();
1348 SmallVector<QualType, 4> ArgTypes;
1349 ArgTypes.push_back(Context.VoidPtrTy);
1350 for (unsigned I = 1, N = Proto->getNumArgs(); I < N; ++I)
1351 ArgTypes.push_back(Proto->getArgType(I));
1353 FunctionProtoType::ExtProtoInfo EPI;
1354 EPI.Variadic = Proto->isVariadic();
1356 ExpectedFunctionType
1357 = Context.getFunctionType(Context.VoidTy, ArgTypes.data(),
1358 ArgTypes.size(), EPI);
1361 for (LookupResult::iterator D = FoundDelete.begin(),
1362 DEnd = FoundDelete.end();
1364 FunctionDecl *Fn = 0;
1365 if (FunctionTemplateDecl *FnTmpl
1366 = dyn_cast<FunctionTemplateDecl>((*D)->getUnderlyingDecl())) {
1367 // Perform template argument deduction to try to match the
1368 // expected function type.
1369 TemplateDeductionInfo Info(Context, StartLoc);
1370 if (DeduceTemplateArguments(FnTmpl, 0, ExpectedFunctionType, Fn, Info))
1373 Fn = cast<FunctionDecl>((*D)->getUnderlyingDecl());
1375 if (Context.hasSameType(Fn->getType(), ExpectedFunctionType))
1376 Matches.push_back(std::make_pair(D.getPair(), Fn));
1379 // C++ [expr.new]p20:
1380 // [...] Any non-placement deallocation function matches a
1381 // non-placement allocation function. [...]
1382 for (LookupResult::iterator D = FoundDelete.begin(),
1383 DEnd = FoundDelete.end();
1385 if (FunctionDecl *Fn = dyn_cast<FunctionDecl>((*D)->getUnderlyingDecl()))
1386 if (isNonPlacementDeallocationFunction(Fn))
1387 Matches.push_back(std::make_pair(D.getPair(), Fn));
1391 // C++ [expr.new]p20:
1392 // [...] If the lookup finds a single matching deallocation
1393 // function, that function will be called; otherwise, no
1394 // deallocation function will be called.
1395 if (Matches.size() == 1) {
1396 OperatorDelete = Matches[0].second;
1398 // C++0x [expr.new]p20:
1399 // If the lookup finds the two-parameter form of a usual
1400 // deallocation function (3.7.4.2) and that function, considered
1401 // as a placement deallocation function, would have been
1402 // selected as a match for the allocation function, the program
1404 if (NumPlaceArgs && getLangOptions().CPlusPlus0x &&
1405 isNonPlacementDeallocationFunction(OperatorDelete)) {
1406 Diag(StartLoc, diag::err_placement_new_non_placement_delete)
1407 << SourceRange(PlaceArgs[0]->getLocStart(),
1408 PlaceArgs[NumPlaceArgs - 1]->getLocEnd());
1409 Diag(OperatorDelete->getLocation(), diag::note_previous_decl)
1412 CheckAllocationAccess(StartLoc, Range, FoundDelete.getNamingClass(),
1420 /// FindAllocationOverload - Find an fitting overload for the allocation
1421 /// function in the specified scope.
1422 bool Sema::FindAllocationOverload(SourceLocation StartLoc, SourceRange Range,
1423 DeclarationName Name, Expr** Args,
1424 unsigned NumArgs, DeclContext *Ctx,
1425 bool AllowMissing, FunctionDecl *&Operator,
1427 LookupResult R(*this, Name, StartLoc, LookupOrdinaryName);
1428 LookupQualifiedName(R, Ctx);
1430 if (AllowMissing || !Diagnose)
1432 return Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
1436 if (R.isAmbiguous())
1439 R.suppressDiagnostics();
1441 OverloadCandidateSet Candidates(StartLoc);
1442 for (LookupResult::iterator Alloc = R.begin(), AllocEnd = R.end();
1443 Alloc != AllocEnd; ++Alloc) {
1444 // Even member operator new/delete are implicitly treated as
1445 // static, so don't use AddMemberCandidate.
1446 NamedDecl *D = (*Alloc)->getUnderlyingDecl();
1448 if (FunctionTemplateDecl *FnTemplate = dyn_cast<FunctionTemplateDecl>(D)) {
1449 AddTemplateOverloadCandidate(FnTemplate, Alloc.getPair(),
1450 /*ExplicitTemplateArgs=*/0, Args, NumArgs,
1452 /*SuppressUserConversions=*/false);
1456 FunctionDecl *Fn = cast<FunctionDecl>(D);
1457 AddOverloadCandidate(Fn, Alloc.getPair(), Args, NumArgs, Candidates,
1458 /*SuppressUserConversions=*/false);
1461 // Do the resolution.
1462 OverloadCandidateSet::iterator Best;
1463 switch (Candidates.BestViableFunction(*this, StartLoc, Best)) {
1466 FunctionDecl *FnDecl = Best->Function;
1467 MarkDeclarationReferenced(StartLoc, FnDecl);
1468 // The first argument is size_t, and the first parameter must be size_t,
1469 // too. This is checked on declaration and can be assumed. (It can't be
1470 // asserted on, though, since invalid decls are left in there.)
1471 // Watch out for variadic allocator function.
1472 unsigned NumArgsInFnDecl = FnDecl->getNumParams();
1473 for (unsigned i = 0; (i < NumArgs && i < NumArgsInFnDecl); ++i) {
1474 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
1475 FnDecl->getParamDecl(i));
1477 if (!Diagnose && !CanPerformCopyInitialization(Entity, Owned(Args[i])))
1481 = PerformCopyInitialization(Entity, SourceLocation(), Owned(Args[i]));
1482 if (Result.isInvalid())
1485 Args[i] = Result.takeAs<Expr>();
1488 CheckAllocationAccess(StartLoc, Range, R.getNamingClass(), Best->FoundDecl,
1493 case OR_No_Viable_Function:
1495 Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
1497 Candidates.NoteCandidates(*this, OCD_AllCandidates, Args, NumArgs);
1503 Diag(StartLoc, diag::err_ovl_ambiguous_call)
1505 Candidates.NoteCandidates(*this, OCD_ViableCandidates, Args, NumArgs);
1511 Diag(StartLoc, diag::err_ovl_deleted_call)
1512 << Best->Function->isDeleted()
1514 << getDeletedOrUnavailableSuffix(Best->Function)
1516 Candidates.NoteCandidates(*this, OCD_AllCandidates, Args, NumArgs);
1521 llvm_unreachable("Unreachable, bad result from BestViableFunction");
1525 /// DeclareGlobalNewDelete - Declare the global forms of operator new and
1526 /// delete. These are:
1529 /// void* operator new(std::size_t) throw(std::bad_alloc);
1530 /// void* operator new[](std::size_t) throw(std::bad_alloc);
1531 /// void operator delete(void *) throw();
1532 /// void operator delete[](void *) throw();
1534 /// void* operator new(std::size_t);
1535 /// void* operator new[](std::size_t);
1536 /// void operator delete(void *);
1537 /// void operator delete[](void *);
1539 /// C++0x operator delete is implicitly noexcept.
1540 /// Note that the placement and nothrow forms of new are *not* implicitly
1541 /// declared. Their use requires including \<new\>.
1542 void Sema::DeclareGlobalNewDelete() {
1543 if (GlobalNewDeleteDeclared)
1546 // C++ [basic.std.dynamic]p2:
1547 // [...] The following allocation and deallocation functions (18.4) are
1548 // implicitly declared in global scope in each translation unit of a
1552 // void* operator new(std::size_t) throw(std::bad_alloc);
1553 // void* operator new[](std::size_t) throw(std::bad_alloc);
1554 // void operator delete(void*) throw();
1555 // void operator delete[](void*) throw();
1557 // void* operator new(std::size_t);
1558 // void* operator new[](std::size_t);
1559 // void operator delete(void*);
1560 // void operator delete[](void*);
1562 // These implicit declarations introduce only the function names operator
1563 // new, operator new[], operator delete, operator delete[].
1565 // Here, we need to refer to std::bad_alloc, so we will implicitly declare
1566 // "std" or "bad_alloc" as necessary to form the exception specification.
1567 // However, we do not make these implicit declarations visible to name
1569 // Note that the C++0x versions of operator delete are deallocation functions,
1570 // and thus are implicitly noexcept.
1571 if (!StdBadAlloc && !getLangOptions().CPlusPlus0x) {
1572 // The "std::bad_alloc" class has not yet been declared, so build it
1574 StdBadAlloc = CXXRecordDecl::Create(Context, TTK_Class,
1575 getOrCreateStdNamespace(),
1576 SourceLocation(), SourceLocation(),
1577 &PP.getIdentifierTable().get("bad_alloc"),
1579 getStdBadAlloc()->setImplicit(true);
1582 GlobalNewDeleteDeclared = true;
1584 QualType VoidPtr = Context.getPointerType(Context.VoidTy);
1585 QualType SizeT = Context.getSizeType();
1586 bool AssumeSaneOperatorNew = getLangOptions().AssumeSaneOperatorNew;
1588 DeclareGlobalAllocationFunction(
1589 Context.DeclarationNames.getCXXOperatorName(OO_New),
1590 VoidPtr, SizeT, AssumeSaneOperatorNew);
1591 DeclareGlobalAllocationFunction(
1592 Context.DeclarationNames.getCXXOperatorName(OO_Array_New),
1593 VoidPtr, SizeT, AssumeSaneOperatorNew);
1594 DeclareGlobalAllocationFunction(
1595 Context.DeclarationNames.getCXXOperatorName(OO_Delete),
1596 Context.VoidTy, VoidPtr);
1597 DeclareGlobalAllocationFunction(
1598 Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete),
1599 Context.VoidTy, VoidPtr);
1602 /// DeclareGlobalAllocationFunction - Declares a single implicit global
1603 /// allocation function if it doesn't already exist.
1604 void Sema::DeclareGlobalAllocationFunction(DeclarationName Name,
1605 QualType Return, QualType Argument,
1606 bool AddMallocAttr) {
1607 DeclContext *GlobalCtx = Context.getTranslationUnitDecl();
1609 // Check if this function is already declared.
1611 DeclContext::lookup_iterator Alloc, AllocEnd;
1612 for (llvm::tie(Alloc, AllocEnd) = GlobalCtx->lookup(Name);
1613 Alloc != AllocEnd; ++Alloc) {
1614 // Only look at non-template functions, as it is the predefined,
1615 // non-templated allocation function we are trying to declare here.
1616 if (FunctionDecl *Func = dyn_cast<FunctionDecl>(*Alloc)) {
1617 QualType InitialParamType =
1618 Context.getCanonicalType(
1619 Func->getParamDecl(0)->getType().getUnqualifiedType());
1620 // FIXME: Do we need to check for default arguments here?
1621 if (Func->getNumParams() == 1 && InitialParamType == Argument) {
1622 if(AddMallocAttr && !Func->hasAttr<MallocAttr>())
1623 Func->addAttr(::new (Context) MallocAttr(SourceLocation(), Context));
1630 QualType BadAllocType;
1631 bool HasBadAllocExceptionSpec
1632 = (Name.getCXXOverloadedOperator() == OO_New ||
1633 Name.getCXXOverloadedOperator() == OO_Array_New);
1634 if (HasBadAllocExceptionSpec && !getLangOptions().CPlusPlus0x) {
1635 assert(StdBadAlloc && "Must have std::bad_alloc declared");
1636 BadAllocType = Context.getTypeDeclType(getStdBadAlloc());
1639 FunctionProtoType::ExtProtoInfo EPI;
1640 if (HasBadAllocExceptionSpec) {
1641 if (!getLangOptions().CPlusPlus0x) {
1642 EPI.ExceptionSpecType = EST_Dynamic;
1643 EPI.NumExceptions = 1;
1644 EPI.Exceptions = &BadAllocType;
1647 EPI.ExceptionSpecType = getLangOptions().CPlusPlus0x ?
1648 EST_BasicNoexcept : EST_DynamicNone;
1651 QualType FnType = Context.getFunctionType(Return, &Argument, 1, EPI);
1652 FunctionDecl *Alloc =
1653 FunctionDecl::Create(Context, GlobalCtx, SourceLocation(),
1654 SourceLocation(), Name,
1655 FnType, /*TInfo=*/0, SC_None,
1656 SC_None, false, true);
1657 Alloc->setImplicit();
1660 Alloc->addAttr(::new (Context) MallocAttr(SourceLocation(), Context));
1662 ParmVarDecl *Param = ParmVarDecl::Create(Context, Alloc, SourceLocation(),
1663 SourceLocation(), 0,
1664 Argument, /*TInfo=*/0,
1665 SC_None, SC_None, 0);
1666 Alloc->setParams(Param);
1668 // FIXME: Also add this declaration to the IdentifierResolver, but
1669 // make sure it is at the end of the chain to coincide with the
1671 Context.getTranslationUnitDecl()->addDecl(Alloc);
1674 bool Sema::FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD,
1675 DeclarationName Name,
1676 FunctionDecl* &Operator, bool Diagnose) {
1677 LookupResult Found(*this, Name, StartLoc, LookupOrdinaryName);
1678 // Try to find operator delete/operator delete[] in class scope.
1679 LookupQualifiedName(Found, RD);
1681 if (Found.isAmbiguous())
1684 Found.suppressDiagnostics();
1686 SmallVector<DeclAccessPair,4> Matches;
1687 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end();
1689 NamedDecl *ND = (*F)->getUnderlyingDecl();
1691 // Ignore template operator delete members from the check for a usual
1692 // deallocation function.
1693 if (isa<FunctionTemplateDecl>(ND))
1696 if (cast<CXXMethodDecl>(ND)->isUsualDeallocationFunction())
1697 Matches.push_back(F.getPair());
1700 // There's exactly one suitable operator; pick it.
1701 if (Matches.size() == 1) {
1702 Operator = cast<CXXMethodDecl>(Matches[0]->getUnderlyingDecl());
1704 if (Operator->isDeleted()) {
1706 Diag(StartLoc, diag::err_deleted_function_use);
1707 Diag(Operator->getLocation(), diag::note_unavailable_here) << true;
1712 CheckAllocationAccess(StartLoc, SourceRange(), Found.getNamingClass(),
1713 Matches[0], Diagnose);
1716 // We found multiple suitable operators; complain about the ambiguity.
1717 } else if (!Matches.empty()) {
1719 Diag(StartLoc, diag::err_ambiguous_suitable_delete_member_function_found)
1722 for (SmallVectorImpl<DeclAccessPair>::iterator
1723 F = Matches.begin(), FEnd = Matches.end(); F != FEnd; ++F)
1724 Diag((*F)->getUnderlyingDecl()->getLocation(),
1725 diag::note_member_declared_here) << Name;
1730 // We did find operator delete/operator delete[] declarations, but
1731 // none of them were suitable.
1732 if (!Found.empty()) {
1734 Diag(StartLoc, diag::err_no_suitable_delete_member_function_found)
1737 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end();
1739 Diag((*F)->getUnderlyingDecl()->getLocation(),
1740 diag::note_member_declared_here) << Name;
1745 // Look for a global declaration.
1746 DeclareGlobalNewDelete();
1747 DeclContext *TUDecl = Context.getTranslationUnitDecl();
1749 CXXNullPtrLiteralExpr Null(Context.VoidPtrTy, SourceLocation());
1750 Expr* DeallocArgs[1];
1751 DeallocArgs[0] = &Null;
1752 if (FindAllocationOverload(StartLoc, SourceRange(), Name,
1753 DeallocArgs, 1, TUDecl, !Diagnose,
1754 Operator, Diagnose))
1757 assert(Operator && "Did not find a deallocation function!");
1761 /// ActOnCXXDelete - Parsed a C++ 'delete' expression (C++ 5.3.5), as in:
1762 /// @code ::delete ptr; @endcode
1764 /// @code delete [] ptr; @endcode
1766 Sema::ActOnCXXDelete(SourceLocation StartLoc, bool UseGlobal,
1767 bool ArrayForm, Expr *ExE) {
1768 // C++ [expr.delete]p1:
1769 // The operand shall have a pointer type, or a class type having a single
1770 // conversion function to a pointer type. The result has type void.
1772 // DR599 amends "pointer type" to "pointer to object type" in both cases.
1774 ExprResult Ex = Owned(ExE);
1775 FunctionDecl *OperatorDelete = 0;
1776 bool ArrayFormAsWritten = ArrayForm;
1777 bool UsualArrayDeleteWantsSize = false;
1779 if (!Ex.get()->isTypeDependent()) {
1780 QualType Type = Ex.get()->getType();
1782 if (const RecordType *Record = Type->getAs<RecordType>()) {
1783 if (RequireCompleteType(StartLoc, Type,
1784 PDiag(diag::err_delete_incomplete_class_type)))
1787 SmallVector<CXXConversionDecl*, 4> ObjectPtrConversions;
1789 CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
1790 const UnresolvedSetImpl *Conversions = RD->getVisibleConversionFunctions();
1791 for (UnresolvedSetImpl::iterator I = Conversions->begin(),
1792 E = Conversions->end(); I != E; ++I) {
1793 NamedDecl *D = I.getDecl();
1794 if (isa<UsingShadowDecl>(D))
1795 D = cast<UsingShadowDecl>(D)->getTargetDecl();
1797 // Skip over templated conversion functions; they aren't considered.
1798 if (isa<FunctionTemplateDecl>(D))
1801 CXXConversionDecl *Conv = cast<CXXConversionDecl>(D);
1803 QualType ConvType = Conv->getConversionType().getNonReferenceType();
1804 if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>())
1805 if (ConvPtrType->getPointeeType()->isIncompleteOrObjectType())
1806 ObjectPtrConversions.push_back(Conv);
1808 if (ObjectPtrConversions.size() == 1) {
1809 // We have a single conversion to a pointer-to-object type. Perform
1811 // TODO: don't redo the conversion calculation.
1813 PerformImplicitConversion(Ex.get(),
1814 ObjectPtrConversions.front()->getConversionType(),
1816 if (Res.isUsable()) {
1818 Type = Ex.get()->getType();
1821 else if (ObjectPtrConversions.size() > 1) {
1822 Diag(StartLoc, diag::err_ambiguous_delete_operand)
1823 << Type << Ex.get()->getSourceRange();
1824 for (unsigned i= 0; i < ObjectPtrConversions.size(); i++)
1825 NoteOverloadCandidate(ObjectPtrConversions[i]);
1830 if (!Type->isPointerType())
1831 return ExprError(Diag(StartLoc, diag::err_delete_operand)
1832 << Type << Ex.get()->getSourceRange());
1834 QualType Pointee = Type->getAs<PointerType>()->getPointeeType();
1835 QualType PointeeElem = Context.getBaseElementType(Pointee);
1837 if (unsigned AddressSpace = Pointee.getAddressSpace())
1838 return Diag(Ex.get()->getLocStart(),
1839 diag::err_address_space_qualified_delete)
1840 << Pointee.getUnqualifiedType() << AddressSpace;
1842 CXXRecordDecl *PointeeRD = 0;
1843 if (Pointee->isVoidType() && !isSFINAEContext()) {
1844 // The C++ standard bans deleting a pointer to a non-object type, which
1845 // effectively bans deletion of "void*". However, most compilers support
1846 // this, so we treat it as a warning unless we're in a SFINAE context.
1847 Diag(StartLoc, diag::ext_delete_void_ptr_operand)
1848 << Type << Ex.get()->getSourceRange();
1849 } else if (Pointee->isFunctionType() || Pointee->isVoidType()) {
1850 return ExprError(Diag(StartLoc, diag::err_delete_operand)
1851 << Type << Ex.get()->getSourceRange());
1852 } else if (!Pointee->isDependentType()) {
1853 if (!RequireCompleteType(StartLoc, Pointee,
1854 PDiag(diag::warn_delete_incomplete)
1855 << Ex.get()->getSourceRange())) {
1856 if (const RecordType *RT = PointeeElem->getAs<RecordType>())
1857 PointeeRD = cast<CXXRecordDecl>(RT->getDecl());
1861 // C++ [expr.delete]p2:
1862 // [Note: a pointer to a const type can be the operand of a
1863 // delete-expression; it is not necessary to cast away the constness
1864 // (5.2.11) of the pointer expression before it is used as the operand
1865 // of the delete-expression. ]
1866 if (!Context.hasSameType(Ex.get()->getType(), Context.VoidPtrTy))
1867 Ex = Owned(ImplicitCastExpr::Create(Context, Context.VoidPtrTy, CK_NoOp,
1868 Ex.take(), 0, VK_RValue));
1870 if (Pointee->isArrayType() && !ArrayForm) {
1871 Diag(StartLoc, diag::warn_delete_array_type)
1872 << Type << Ex.get()->getSourceRange()
1873 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(StartLoc), "[]");
1877 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
1878 ArrayForm ? OO_Array_Delete : OO_Delete);
1882 FindDeallocationFunction(StartLoc, PointeeRD, DeleteName,
1886 // If we're allocating an array of records, check whether the
1887 // usual operator delete[] has a size_t parameter.
1889 // If the user specifically asked to use the global allocator,
1890 // we'll need to do the lookup into the class.
1892 UsualArrayDeleteWantsSize =
1893 doesUsualArrayDeleteWantSize(*this, StartLoc, PointeeElem);
1895 // Otherwise, the usual operator delete[] should be the
1896 // function we just found.
1897 else if (isa<CXXMethodDecl>(OperatorDelete))
1898 UsualArrayDeleteWantsSize = (OperatorDelete->getNumParams() == 2);
1901 if (!PointeeRD->hasTrivialDestructor())
1902 if (CXXDestructorDecl *Dtor = LookupDestructor(PointeeRD)) {
1903 MarkDeclarationReferenced(StartLoc,
1904 const_cast<CXXDestructorDecl*>(Dtor));
1905 DiagnoseUseOfDecl(Dtor, StartLoc);
1908 // C++ [expr.delete]p3:
1909 // In the first alternative (delete object), if the static type of the
1910 // object to be deleted is different from its dynamic type, the static
1911 // type shall be a base class of the dynamic type of the object to be
1912 // deleted and the static type shall have a virtual destructor or the
1913 // behavior is undefined.
1915 // Note: a final class cannot be derived from, no issue there
1916 if (PointeeRD->isPolymorphic() && !PointeeRD->hasAttr<FinalAttr>()) {
1917 CXXDestructorDecl *dtor = PointeeRD->getDestructor();
1918 if (dtor && !dtor->isVirtual()) {
1919 if (PointeeRD->isAbstract()) {
1920 // If the class is abstract, we warn by default, because we're
1921 // sure the code has undefined behavior.
1922 Diag(StartLoc, diag::warn_delete_abstract_non_virtual_dtor)
1924 } else if (!ArrayForm) {
1925 // Otherwise, if this is not an array delete, it's a bit suspect,
1926 // but not necessarily wrong.
1927 Diag(StartLoc, diag::warn_delete_non_virtual_dtor) << PointeeElem;
1932 } else if (getLangOptions().ObjCAutoRefCount &&
1933 PointeeElem->isObjCLifetimeType() &&
1934 (PointeeElem.getObjCLifetime() == Qualifiers::OCL_Strong ||
1935 PointeeElem.getObjCLifetime() == Qualifiers::OCL_Weak) &&
1937 Diag(StartLoc, diag::warn_err_new_delete_object_array)
1938 << 1 << PointeeElem;
1941 if (!OperatorDelete) {
1942 // Look for a global declaration.
1943 DeclareGlobalNewDelete();
1944 DeclContext *TUDecl = Context.getTranslationUnitDecl();
1945 Expr *Arg = Ex.get();
1946 if (FindAllocationOverload(StartLoc, SourceRange(), DeleteName,
1947 &Arg, 1, TUDecl, /*AllowMissing=*/false,
1952 MarkDeclarationReferenced(StartLoc, OperatorDelete);
1954 // Check access and ambiguity of operator delete and destructor.
1956 if (CXXDestructorDecl *Dtor = LookupDestructor(PointeeRD)) {
1957 CheckDestructorAccess(Ex.get()->getExprLoc(), Dtor,
1958 PDiag(diag::err_access_dtor) << PointeeElem);
1964 return Owned(new (Context) CXXDeleteExpr(Context.VoidTy, UseGlobal, ArrayForm,
1966 UsualArrayDeleteWantsSize,
1967 OperatorDelete, Ex.take(), StartLoc));
1970 /// \brief Check the use of the given variable as a C++ condition in an if,
1971 /// while, do-while, or switch statement.
1972 ExprResult Sema::CheckConditionVariable(VarDecl *ConditionVar,
1973 SourceLocation StmtLoc,
1974 bool ConvertToBoolean) {
1975 QualType T = ConditionVar->getType();
1977 // C++ [stmt.select]p2:
1978 // The declarator shall not specify a function or an array.
1979 if (T->isFunctionType())
1980 return ExprError(Diag(ConditionVar->getLocation(),
1981 diag::err_invalid_use_of_function_type)
1982 << ConditionVar->getSourceRange());
1983 else if (T->isArrayType())
1984 return ExprError(Diag(ConditionVar->getLocation(),
1985 diag::err_invalid_use_of_array_type)
1986 << ConditionVar->getSourceRange());
1988 ExprResult Condition =
1989 Owned(DeclRefExpr::Create(Context, NestedNameSpecifierLoc(),
1991 ConditionVar->getLocation(),
1992 ConditionVar->getType().getNonReferenceType(),
1994 if (ConvertToBoolean) {
1995 Condition = CheckBooleanCondition(Condition.take(), StmtLoc);
1996 if (Condition.isInvalid())
2000 return move(Condition);
2003 /// CheckCXXBooleanCondition - Returns true if a conversion to bool is invalid.
2004 ExprResult Sema::CheckCXXBooleanCondition(Expr *CondExpr) {
2006 // The value of a condition that is an initialized declaration in a statement
2007 // other than a switch statement is the value of the declared variable
2008 // implicitly converted to type bool. If that conversion is ill-formed, the
2009 // program is ill-formed.
2010 // The value of a condition that is an expression is the value of the
2011 // expression, implicitly converted to bool.
2013 return PerformContextuallyConvertToBool(CondExpr);
2016 /// Helper function to determine whether this is the (deprecated) C++
2017 /// conversion from a string literal to a pointer to non-const char or
2018 /// non-const wchar_t (for narrow and wide string literals,
2021 Sema::IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType) {
2022 // Look inside the implicit cast, if it exists.
2023 if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(From))
2024 From = Cast->getSubExpr();
2026 // A string literal (2.13.4) that is not a wide string literal can
2027 // be converted to an rvalue of type "pointer to char"; a wide
2028 // string literal can be converted to an rvalue of type "pointer
2029 // to wchar_t" (C++ 4.2p2).
2030 if (StringLiteral *StrLit = dyn_cast<StringLiteral>(From->IgnoreParens()))
2031 if (const PointerType *ToPtrType = ToType->getAs<PointerType>())
2032 if (const BuiltinType *ToPointeeType
2033 = ToPtrType->getPointeeType()->getAs<BuiltinType>()) {
2034 // This conversion is considered only when there is an
2035 // explicit appropriate pointer target type (C++ 4.2p2).
2036 if (!ToPtrType->getPointeeType().hasQualifiers()) {
2037 switch (StrLit->getKind()) {
2038 case StringLiteral::UTF8:
2039 case StringLiteral::UTF16:
2040 case StringLiteral::UTF32:
2041 // We don't allow UTF literals to be implicitly converted
2043 case StringLiteral::Ascii:
2044 return (ToPointeeType->getKind() == BuiltinType::Char_U ||
2045 ToPointeeType->getKind() == BuiltinType::Char_S);
2046 case StringLiteral::Wide:
2047 return ToPointeeType->isWideCharType();
2055 static ExprResult BuildCXXCastArgument(Sema &S,
2056 SourceLocation CastLoc,
2059 CXXMethodDecl *Method,
2060 DeclAccessPair FoundDecl,
2061 bool HadMultipleCandidates,
2064 default: llvm_unreachable("Unhandled cast kind!");
2065 case CK_ConstructorConversion: {
2066 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Method);
2067 ASTOwningVector<Expr*> ConstructorArgs(S);
2069 if (S.CompleteConstructorCall(Constructor,
2070 MultiExprArg(&From, 1),
2071 CastLoc, ConstructorArgs))
2074 S.CheckConstructorAccess(CastLoc, Constructor, Constructor->getAccess(),
2075 S.PDiag(diag::err_access_ctor));
2078 = S.BuildCXXConstructExpr(CastLoc, Ty, cast<CXXConstructorDecl>(Method),
2079 move_arg(ConstructorArgs),
2080 HadMultipleCandidates, /*ZeroInit*/ false,
2081 CXXConstructExpr::CK_Complete, SourceRange());
2082 if (Result.isInvalid())
2085 return S.MaybeBindToTemporary(Result.takeAs<Expr>());
2088 case CK_UserDefinedConversion: {
2089 assert(!From->getType()->isPointerType() && "Arg can't have pointer type!");
2091 // Create an implicit call expr that calls it.
2092 ExprResult Result = S.BuildCXXMemberCallExpr(From, FoundDecl, Method,
2093 HadMultipleCandidates);
2094 if (Result.isInvalid())
2097 S.CheckMemberOperatorAccess(CastLoc, From, /*arg*/ 0, FoundDecl);
2099 return S.MaybeBindToTemporary(Result.get());
2104 /// PerformImplicitConversion - Perform an implicit conversion of the
2105 /// expression From to the type ToType using the pre-computed implicit
2106 /// conversion sequence ICS. Returns the converted
2107 /// expression. Action is the kind of conversion we're performing,
2108 /// used in the error message.
2110 Sema::PerformImplicitConversion(Expr *From, QualType ToType,
2111 const ImplicitConversionSequence &ICS,
2112 AssignmentAction Action,
2113 CheckedConversionKind CCK) {
2114 switch (ICS.getKind()) {
2115 case ImplicitConversionSequence::StandardConversion: {
2116 ExprResult Res = PerformImplicitConversion(From, ToType, ICS.Standard,
2118 if (Res.isInvalid())
2124 case ImplicitConversionSequence::UserDefinedConversion: {
2126 FunctionDecl *FD = ICS.UserDefined.ConversionFunction;
2128 QualType BeforeToType;
2129 if (const CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(FD)) {
2130 CastKind = CK_UserDefinedConversion;
2132 // If the user-defined conversion is specified by a conversion function,
2133 // the initial standard conversion sequence converts the source type to
2134 // the implicit object parameter of the conversion function.
2135 BeforeToType = Context.getTagDeclType(Conv->getParent());
2137 const CXXConstructorDecl *Ctor = cast<CXXConstructorDecl>(FD);
2138 CastKind = CK_ConstructorConversion;
2139 // Do no conversion if dealing with ... for the first conversion.
2140 if (!ICS.UserDefined.EllipsisConversion) {
2141 // If the user-defined conversion is specified by a constructor, the
2142 // initial standard conversion sequence converts the source type to the
2143 // type required by the argument of the constructor
2144 BeforeToType = Ctor->getParamDecl(0)->getType().getNonReferenceType();
2147 // Watch out for elipsis conversion.
2148 if (!ICS.UserDefined.EllipsisConversion) {
2150 PerformImplicitConversion(From, BeforeToType,
2151 ICS.UserDefined.Before, AA_Converting,
2153 if (Res.isInvalid())
2159 = BuildCXXCastArgument(*this,
2160 From->getLocStart(),
2161 ToType.getNonReferenceType(),
2162 CastKind, cast<CXXMethodDecl>(FD),
2163 ICS.UserDefined.FoundConversionFunction,
2164 ICS.UserDefined.HadMultipleCandidates,
2167 if (CastArg.isInvalid())
2170 From = CastArg.take();
2172 return PerformImplicitConversion(From, ToType, ICS.UserDefined.After,
2173 AA_Converting, CCK);
2176 case ImplicitConversionSequence::AmbiguousConversion:
2177 ICS.DiagnoseAmbiguousConversion(*this, From->getExprLoc(),
2178 PDiag(diag::err_typecheck_ambiguous_condition)
2179 << From->getSourceRange());
2182 case ImplicitConversionSequence::EllipsisConversion:
2183 llvm_unreachable("Cannot perform an ellipsis conversion");
2185 case ImplicitConversionSequence::BadConversion:
2189 // Everything went well.
2193 /// PerformImplicitConversion - Perform an implicit conversion of the
2194 /// expression From to the type ToType by following the standard
2195 /// conversion sequence SCS. Returns the converted
2196 /// expression. Flavor is the context in which we're performing this
2197 /// conversion, for use in error messages.
2199 Sema::PerformImplicitConversion(Expr *From, QualType ToType,
2200 const StandardConversionSequence& SCS,
2201 AssignmentAction Action,
2202 CheckedConversionKind CCK) {
2203 bool CStyle = (CCK == CCK_CStyleCast || CCK == CCK_FunctionalCast);
2205 // Overall FIXME: we are recomputing too many types here and doing far too
2206 // much extra work. What this means is that we need to keep track of more
2207 // information that is computed when we try the implicit conversion initially,
2208 // so that we don't need to recompute anything here.
2209 QualType FromType = From->getType();
2211 if (SCS.CopyConstructor) {
2212 // FIXME: When can ToType be a reference type?
2213 assert(!ToType->isReferenceType());
2214 if (SCS.Second == ICK_Derived_To_Base) {
2215 ASTOwningVector<Expr*> ConstructorArgs(*this);
2216 if (CompleteConstructorCall(cast<CXXConstructorDecl>(SCS.CopyConstructor),
2217 MultiExprArg(*this, &From, 1),
2218 /*FIXME:ConstructLoc*/SourceLocation(),
2221 return BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(),
2222 ToType, SCS.CopyConstructor,
2223 move_arg(ConstructorArgs),
2224 /*HadMultipleCandidates*/ false,
2226 CXXConstructExpr::CK_Complete,
2229 return BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(),
2230 ToType, SCS.CopyConstructor,
2231 MultiExprArg(*this, &From, 1),
2232 /*HadMultipleCandidates*/ false,
2234 CXXConstructExpr::CK_Complete,
2238 // Resolve overloaded function references.
2239 if (Context.hasSameType(FromType, Context.OverloadTy)) {
2240 DeclAccessPair Found;
2241 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(From, ToType,
2246 if (DiagnoseUseOfDecl(Fn, From->getSourceRange().getBegin()))
2249 From = FixOverloadedFunctionReference(From, Found, Fn);
2250 FromType = From->getType();
2253 // Perform the first implicit conversion.
2254 switch (SCS.First) {
2259 case ICK_Lvalue_To_Rvalue:
2260 // Should this get its own ICK?
2261 if (From->getObjectKind() == OK_ObjCProperty) {
2262 ExprResult FromRes = ConvertPropertyForRValue(From);
2263 if (FromRes.isInvalid())
2265 From = FromRes.take();
2266 if (!From->isGLValue()) break;
2269 FromType = FromType.getUnqualifiedType();
2270 From = ImplicitCastExpr::Create(Context, FromType, CK_LValueToRValue,
2271 From, 0, VK_RValue);
2274 case ICK_Array_To_Pointer:
2275 FromType = Context.getArrayDecayedType(FromType);
2276 From = ImpCastExprToType(From, FromType, CK_ArrayToPointerDecay,
2277 VK_RValue, /*BasePath=*/0, CCK).take();
2280 case ICK_Function_To_Pointer:
2281 FromType = Context.getPointerType(FromType);
2282 From = ImpCastExprToType(From, FromType, CK_FunctionToPointerDecay,
2283 VK_RValue, /*BasePath=*/0, CCK).take();
2287 llvm_unreachable("Improper first standard conversion");
2290 // Perform the second implicit conversion
2291 switch (SCS.Second) {
2293 // If both sides are functions (or pointers/references to them), there could
2294 // be incompatible exception declarations.
2295 if (CheckExceptionSpecCompatibility(From, ToType))
2297 // Nothing else to do.
2300 case ICK_NoReturn_Adjustment:
2301 // If both sides are functions (or pointers/references to them), there could
2302 // be incompatible exception declarations.
2303 if (CheckExceptionSpecCompatibility(From, ToType))
2306 From = ImpCastExprToType(From, ToType, CK_NoOp,
2307 VK_RValue, /*BasePath=*/0, CCK).take();
2310 case ICK_Integral_Promotion:
2311 case ICK_Integral_Conversion:
2312 From = ImpCastExprToType(From, ToType, CK_IntegralCast,
2313 VK_RValue, /*BasePath=*/0, CCK).take();
2316 case ICK_Floating_Promotion:
2317 case ICK_Floating_Conversion:
2318 From = ImpCastExprToType(From, ToType, CK_FloatingCast,
2319 VK_RValue, /*BasePath=*/0, CCK).take();
2322 case ICK_Complex_Promotion:
2323 case ICK_Complex_Conversion: {
2324 QualType FromEl = From->getType()->getAs<ComplexType>()->getElementType();
2325 QualType ToEl = ToType->getAs<ComplexType>()->getElementType();
2327 if (FromEl->isRealFloatingType()) {
2328 if (ToEl->isRealFloatingType())
2329 CK = CK_FloatingComplexCast;
2331 CK = CK_FloatingComplexToIntegralComplex;
2332 } else if (ToEl->isRealFloatingType()) {
2333 CK = CK_IntegralComplexToFloatingComplex;
2335 CK = CK_IntegralComplexCast;
2337 From = ImpCastExprToType(From, ToType, CK,
2338 VK_RValue, /*BasePath=*/0, CCK).take();
2342 case ICK_Floating_Integral:
2343 if (ToType->isRealFloatingType())
2344 From = ImpCastExprToType(From, ToType, CK_IntegralToFloating,
2345 VK_RValue, /*BasePath=*/0, CCK).take();
2347 From = ImpCastExprToType(From, ToType, CK_FloatingToIntegral,
2348 VK_RValue, /*BasePath=*/0, CCK).take();
2351 case ICK_Compatible_Conversion:
2352 From = ImpCastExprToType(From, ToType, CK_NoOp,
2353 VK_RValue, /*BasePath=*/0, CCK).take();
2356 case ICK_Writeback_Conversion:
2357 case ICK_Pointer_Conversion: {
2358 if (SCS.IncompatibleObjC && Action != AA_Casting) {
2359 // Diagnose incompatible Objective-C conversions
2360 if (Action == AA_Initializing || Action == AA_Assigning)
2361 Diag(From->getSourceRange().getBegin(),
2362 diag::ext_typecheck_convert_incompatible_pointer)
2363 << ToType << From->getType() << Action
2364 << From->getSourceRange() << 0;
2366 Diag(From->getSourceRange().getBegin(),
2367 diag::ext_typecheck_convert_incompatible_pointer)
2368 << From->getType() << ToType << Action
2369 << From->getSourceRange() << 0;
2371 if (From->getType()->isObjCObjectPointerType() &&
2372 ToType->isObjCObjectPointerType())
2373 EmitRelatedResultTypeNote(From);
2375 else if (getLangOptions().ObjCAutoRefCount &&
2376 !CheckObjCARCUnavailableWeakConversion(ToType,
2378 if (Action == AA_Initializing)
2379 Diag(From->getSourceRange().getBegin(),
2380 diag::err_arc_weak_unavailable_assign);
2382 Diag(From->getSourceRange().getBegin(),
2383 diag::err_arc_convesion_of_weak_unavailable)
2384 << (Action == AA_Casting) << From->getType() << ToType
2385 << From->getSourceRange();
2388 CastKind Kind = CK_Invalid;
2389 CXXCastPath BasePath;
2390 if (CheckPointerConversion(From, ToType, Kind, BasePath, CStyle))
2393 // Make sure we extend blocks if necessary.
2394 // FIXME: doing this here is really ugly.
2395 if (Kind == CK_BlockPointerToObjCPointerCast) {
2396 ExprResult E = From;
2397 (void) PrepareCastToObjCObjectPointer(E);
2401 From = ImpCastExprToType(From, ToType, Kind, VK_RValue, &BasePath, CCK)
2406 case ICK_Pointer_Member: {
2407 CastKind Kind = CK_Invalid;
2408 CXXCastPath BasePath;
2409 if (CheckMemberPointerConversion(From, ToType, Kind, BasePath, CStyle))
2411 if (CheckExceptionSpecCompatibility(From, ToType))
2413 From = ImpCastExprToType(From, ToType, Kind, VK_RValue, &BasePath, CCK)
2418 case ICK_Boolean_Conversion:
2419 // Perform half-to-boolean conversion via float.
2420 if (From->getType()->isHalfType()) {
2421 From = ImpCastExprToType(From, Context.FloatTy, CK_FloatingCast).take();
2422 FromType = Context.FloatTy;
2425 From = ImpCastExprToType(From, Context.BoolTy,
2426 ScalarTypeToBooleanCastKind(FromType),
2427 VK_RValue, /*BasePath=*/0, CCK).take();
2430 case ICK_Derived_To_Base: {
2431 CXXCastPath BasePath;
2432 if (CheckDerivedToBaseConversion(From->getType(),
2433 ToType.getNonReferenceType(),
2434 From->getLocStart(),
2435 From->getSourceRange(),
2440 From = ImpCastExprToType(From, ToType.getNonReferenceType(),
2441 CK_DerivedToBase, From->getValueKind(),
2442 &BasePath, CCK).take();
2446 case ICK_Vector_Conversion:
2447 From = ImpCastExprToType(From, ToType, CK_BitCast,
2448 VK_RValue, /*BasePath=*/0, CCK).take();
2451 case ICK_Vector_Splat:
2452 From = ImpCastExprToType(From, ToType, CK_VectorSplat,
2453 VK_RValue, /*BasePath=*/0, CCK).take();
2456 case ICK_Complex_Real:
2457 // Case 1. x -> _Complex y
2458 if (const ComplexType *ToComplex = ToType->getAs<ComplexType>()) {
2459 QualType ElType = ToComplex->getElementType();
2460 bool isFloatingComplex = ElType->isRealFloatingType();
2463 if (Context.hasSameUnqualifiedType(ElType, From->getType())) {
2465 } else if (From->getType()->isRealFloatingType()) {
2466 From = ImpCastExprToType(From, ElType,
2467 isFloatingComplex ? CK_FloatingCast : CK_FloatingToIntegral).take();
2469 assert(From->getType()->isIntegerType());
2470 From = ImpCastExprToType(From, ElType,
2471 isFloatingComplex ? CK_IntegralToFloating : CK_IntegralCast).take();
2474 From = ImpCastExprToType(From, ToType,
2475 isFloatingComplex ? CK_FloatingRealToComplex
2476 : CK_IntegralRealToComplex).take();
2478 // Case 2. _Complex x -> y
2480 const ComplexType *FromComplex = From->getType()->getAs<ComplexType>();
2481 assert(FromComplex);
2483 QualType ElType = FromComplex->getElementType();
2484 bool isFloatingComplex = ElType->isRealFloatingType();
2487 From = ImpCastExprToType(From, ElType,
2488 isFloatingComplex ? CK_FloatingComplexToReal
2489 : CK_IntegralComplexToReal,
2490 VK_RValue, /*BasePath=*/0, CCK).take();
2493 if (Context.hasSameUnqualifiedType(ElType, ToType)) {
2495 } else if (ToType->isRealFloatingType()) {
2496 From = ImpCastExprToType(From, ToType,
2497 isFloatingComplex ? CK_FloatingCast : CK_IntegralToFloating,
2498 VK_RValue, /*BasePath=*/0, CCK).take();
2500 assert(ToType->isIntegerType());
2501 From = ImpCastExprToType(From, ToType,
2502 isFloatingComplex ? CK_FloatingToIntegral : CK_IntegralCast,
2503 VK_RValue, /*BasePath=*/0, CCK).take();
2508 case ICK_Block_Pointer_Conversion: {
2509 From = ImpCastExprToType(From, ToType.getUnqualifiedType(), CK_BitCast,
2510 VK_RValue, /*BasePath=*/0, CCK).take();
2514 case ICK_TransparentUnionConversion: {
2515 ExprResult FromRes = Owned(From);
2516 Sema::AssignConvertType ConvTy =
2517 CheckTransparentUnionArgumentConstraints(ToType, FromRes);
2518 if (FromRes.isInvalid())
2520 From = FromRes.take();
2521 assert ((ConvTy == Sema::Compatible) &&
2522 "Improper transparent union conversion");
2527 case ICK_Lvalue_To_Rvalue:
2528 case ICK_Array_To_Pointer:
2529 case ICK_Function_To_Pointer:
2530 case ICK_Qualification:
2531 case ICK_Num_Conversion_Kinds:
2532 llvm_unreachable("Improper second standard conversion");
2535 switch (SCS.Third) {
2540 case ICK_Qualification: {
2541 // The qualification keeps the category of the inner expression, unless the
2542 // target type isn't a reference.
2543 ExprValueKind VK = ToType->isReferenceType() ?
2544 From->getValueKind() : VK_RValue;
2545 From = ImpCastExprToType(From, ToType.getNonLValueExprType(Context),
2546 CK_NoOp, VK, /*BasePath=*/0, CCK).take();
2548 if (SCS.DeprecatedStringLiteralToCharPtr &&
2549 !getLangOptions().WritableStrings)
2550 Diag(From->getLocStart(), diag::warn_deprecated_string_literal_conversion)
2551 << ToType.getNonReferenceType();
2557 llvm_unreachable("Improper third standard conversion");
2563 ExprResult Sema::ActOnUnaryTypeTrait(UnaryTypeTrait UTT,
2564 SourceLocation KWLoc,
2566 SourceLocation RParen) {
2567 TypeSourceInfo *TSInfo;
2568 QualType T = GetTypeFromParser(Ty, &TSInfo);
2571 TSInfo = Context.getTrivialTypeSourceInfo(T);
2572 return BuildUnaryTypeTrait(UTT, KWLoc, TSInfo, RParen);
2575 /// \brief Check the completeness of a type in a unary type trait.
2577 /// If the particular type trait requires a complete type, tries to complete
2578 /// it. If completing the type fails, a diagnostic is emitted and false
2579 /// returned. If completing the type succeeds or no completion was required,
2581 static bool CheckUnaryTypeTraitTypeCompleteness(Sema &S,
2585 // C++0x [meta.unary.prop]p3:
2586 // For all of the class templates X declared in this Clause, instantiating
2587 // that template with a template argument that is a class template
2588 // specialization may result in the implicit instantiation of the template
2589 // argument if and only if the semantics of X require that the argument
2590 // must be a complete type.
2591 // We apply this rule to all the type trait expressions used to implement
2592 // these class templates. We also try to follow any GCC documented behavior
2593 // in these expressions to ensure portability of standard libraries.
2595 // is_complete_type somewhat obviously cannot require a complete type.
2596 case UTT_IsCompleteType:
2599 // These traits are modeled on the type predicates in C++0x
2600 // [meta.unary.cat] and [meta.unary.comp]. They are not specified as
2601 // requiring a complete type, as whether or not they return true cannot be
2602 // impacted by the completeness of the type.
2604 case UTT_IsIntegral:
2605 case UTT_IsFloatingPoint:
2608 case UTT_IsLvalueReference:
2609 case UTT_IsRvalueReference:
2610 case UTT_IsMemberFunctionPointer:
2611 case UTT_IsMemberObjectPointer:
2615 case UTT_IsFunction:
2616 case UTT_IsReference:
2617 case UTT_IsArithmetic:
2618 case UTT_IsFundamental:
2621 case UTT_IsCompound:
2622 case UTT_IsMemberPointer:
2625 // These traits are modeled on type predicates in C++0x [meta.unary.prop]
2626 // which requires some of its traits to have the complete type. However,
2627 // the completeness of the type cannot impact these traits' semantics, and
2628 // so they don't require it. This matches the comments on these traits in
2631 case UTT_IsVolatile:
2633 case UTT_IsUnsigned:
2636 // C++0x [meta.unary.prop] Table 49 requires the following traits to be
2637 // applied to a complete type.
2639 case UTT_IsTriviallyCopyable:
2640 case UTT_IsStandardLayout:
2644 case UTT_IsPolymorphic:
2645 case UTT_IsAbstract:
2648 // These trait expressions are designed to help implement predicates in
2649 // [meta.unary.prop] despite not being named the same. They are specified
2650 // by both GCC and the Embarcadero C++ compiler, and require the complete
2651 // type due to the overarching C++0x type predicates being implemented
2652 // requiring the complete type.
2653 case UTT_HasNothrowAssign:
2654 case UTT_HasNothrowConstructor:
2655 case UTT_HasNothrowCopy:
2656 case UTT_HasTrivialAssign:
2657 case UTT_HasTrivialDefaultConstructor:
2658 case UTT_HasTrivialCopy:
2659 case UTT_HasTrivialDestructor:
2660 case UTT_HasVirtualDestructor:
2661 // Arrays of unknown bound are expressly allowed.
2662 QualType ElTy = ArgTy;
2663 if (ArgTy->isIncompleteArrayType())
2664 ElTy = S.Context.getAsArrayType(ArgTy)->getElementType();
2666 // The void type is expressly allowed.
2667 if (ElTy->isVoidType())
2670 return !S.RequireCompleteType(
2671 Loc, ElTy, diag::err_incomplete_type_used_in_type_trait_expr);
2673 llvm_unreachable("Type trait not handled by switch");
2676 static bool EvaluateUnaryTypeTrait(Sema &Self, UnaryTypeTrait UTT,
2677 SourceLocation KeyLoc, QualType T) {
2678 assert(!T->isDependentType() && "Cannot evaluate traits of dependent type");
2680 ASTContext &C = Self.Context;
2682 // Type trait expressions corresponding to the primary type category
2683 // predicates in C++0x [meta.unary.cat].
2685 return T->isVoidType();
2686 case UTT_IsIntegral:
2687 return T->isIntegralType(C);
2688 case UTT_IsFloatingPoint:
2689 return T->isFloatingType();
2691 return T->isArrayType();
2693 return T->isPointerType();
2694 case UTT_IsLvalueReference:
2695 return T->isLValueReferenceType();
2696 case UTT_IsRvalueReference:
2697 return T->isRValueReferenceType();
2698 case UTT_IsMemberFunctionPointer:
2699 return T->isMemberFunctionPointerType();
2700 case UTT_IsMemberObjectPointer:
2701 return T->isMemberDataPointerType();
2703 return T->isEnumeralType();
2705 return T->isUnionType();
2707 return T->isClassType() || T->isStructureType();
2708 case UTT_IsFunction:
2709 return T->isFunctionType();
2711 // Type trait expressions which correspond to the convenient composition
2712 // predicates in C++0x [meta.unary.comp].
2713 case UTT_IsReference:
2714 return T->isReferenceType();
2715 case UTT_IsArithmetic:
2716 return T->isArithmeticType() && !T->isEnumeralType();
2717 case UTT_IsFundamental:
2718 return T->isFundamentalType();
2720 return T->isObjectType();
2722 // Note: semantic analysis depends on Objective-C lifetime types to be
2723 // considered scalar types. However, such types do not actually behave
2724 // like scalar types at run time (since they may require retain/release
2725 // operations), so we report them as non-scalar.
2726 if (T->isObjCLifetimeType()) {
2727 switch (T.getObjCLifetime()) {
2728 case Qualifiers::OCL_None:
2729 case Qualifiers::OCL_ExplicitNone:
2732 case Qualifiers::OCL_Strong:
2733 case Qualifiers::OCL_Weak:
2734 case Qualifiers::OCL_Autoreleasing:
2739 return T->isScalarType();
2740 case UTT_IsCompound:
2741 return T->isCompoundType();
2742 case UTT_IsMemberPointer:
2743 return T->isMemberPointerType();
2745 // Type trait expressions which correspond to the type property predicates
2746 // in C++0x [meta.unary.prop].
2748 return T.isConstQualified();
2749 case UTT_IsVolatile:
2750 return T.isVolatileQualified();
2752 return T.isTrivialType(Self.Context);
2753 case UTT_IsTriviallyCopyable:
2754 return T.isTriviallyCopyableType(Self.Context);
2755 case UTT_IsStandardLayout:
2756 return T->isStandardLayoutType();
2758 return T.isPODType(Self.Context);
2760 return T->isLiteralType();
2762 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
2763 return !RD->isUnion() && RD->isEmpty();
2765 case UTT_IsPolymorphic:
2766 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
2767 return RD->isPolymorphic();
2769 case UTT_IsAbstract:
2770 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
2771 return RD->isAbstract();
2774 return T->isSignedIntegerType();
2775 case UTT_IsUnsigned:
2776 return T->isUnsignedIntegerType();
2778 // Type trait expressions which query classes regarding their construction,
2779 // destruction, and copying. Rather than being based directly on the
2780 // related type predicates in the standard, they are specified by both
2781 // GCC[1] and the Embarcadero C++ compiler[2], and Clang implements those
2784 // 1: http://gcc.gnu/.org/onlinedocs/gcc/Type-Traits.html
2785 // 2: http://docwiki.embarcadero.com/RADStudio/XE/en/Type_Trait_Functions_(C%2B%2B0x)_Index
2786 case UTT_HasTrivialDefaultConstructor:
2787 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2788 // If __is_pod (type) is true then the trait is true, else if type is
2789 // a cv class or union type (or array thereof) with a trivial default
2790 // constructor ([class.ctor]) then the trait is true, else it is false.
2791 if (T.isPODType(Self.Context))
2793 if (const RecordType *RT =
2794 C.getBaseElementType(T)->getAs<RecordType>())
2795 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialDefaultConstructor();
2797 case UTT_HasTrivialCopy:
2798 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2799 // If __is_pod (type) is true or type is a reference type then
2800 // the trait is true, else if type is a cv class or union type
2801 // with a trivial copy constructor ([class.copy]) then the trait
2802 // is true, else it is false.
2803 if (T.isPODType(Self.Context) || T->isReferenceType())
2805 if (const RecordType *RT = T->getAs<RecordType>())
2806 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialCopyConstructor();
2808 case UTT_HasTrivialAssign:
2809 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2810 // If type is const qualified or is a reference type then the
2811 // trait is false. Otherwise if __is_pod (type) is true then the
2812 // trait is true, else if type is a cv class or union type with
2813 // a trivial copy assignment ([class.copy]) then the trait is
2814 // true, else it is false.
2815 // Note: the const and reference restrictions are interesting,
2816 // given that const and reference members don't prevent a class
2817 // from having a trivial copy assignment operator (but do cause
2818 // errors if the copy assignment operator is actually used, q.v.
2819 // [class.copy]p12).
2821 if (C.getBaseElementType(T).isConstQualified())
2823 if (T.isPODType(Self.Context))
2825 if (const RecordType *RT = T->getAs<RecordType>())
2826 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialCopyAssignment();
2828 case UTT_HasTrivialDestructor:
2829 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2830 // If __is_pod (type) is true or type is a reference type
2831 // then the trait is true, else if type is a cv class or union
2832 // type (or array thereof) with a trivial destructor
2833 // ([class.dtor]) then the trait is true, else it is
2835 if (T.isPODType(Self.Context) || T->isReferenceType())
2838 // Objective-C++ ARC: autorelease types don't require destruction.
2839 if (T->isObjCLifetimeType() &&
2840 T.getObjCLifetime() == Qualifiers::OCL_Autoreleasing)
2843 if (const RecordType *RT =
2844 C.getBaseElementType(T)->getAs<RecordType>())
2845 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialDestructor();
2847 // TODO: Propagate nothrowness for implicitly declared special members.
2848 case UTT_HasNothrowAssign:
2849 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2850 // If type is const qualified or is a reference type then the
2851 // trait is false. Otherwise if __has_trivial_assign (type)
2852 // is true then the trait is true, else if type is a cv class
2853 // or union type with copy assignment operators that are known
2854 // not to throw an exception then the trait is true, else it is
2856 if (C.getBaseElementType(T).isConstQualified())
2858 if (T->isReferenceType())
2860 if (T.isPODType(Self.Context) || T->isObjCLifetimeType())
2862 if (const RecordType *RT = T->getAs<RecordType>()) {
2863 CXXRecordDecl* RD = cast<CXXRecordDecl>(RT->getDecl());
2864 if (RD->hasTrivialCopyAssignment())
2867 bool FoundAssign = false;
2868 DeclarationName Name = C.DeclarationNames.getCXXOperatorName(OO_Equal);
2869 LookupResult Res(Self, DeclarationNameInfo(Name, KeyLoc),
2870 Sema::LookupOrdinaryName);
2871 if (Self.LookupQualifiedName(Res, RD)) {
2872 Res.suppressDiagnostics();
2873 for (LookupResult::iterator Op = Res.begin(), OpEnd = Res.end();
2874 Op != OpEnd; ++Op) {
2875 if (isa<FunctionTemplateDecl>(*Op))
2878 CXXMethodDecl *Operator = cast<CXXMethodDecl>(*Op);
2879 if (Operator->isCopyAssignmentOperator()) {
2881 const FunctionProtoType *CPT
2882 = Operator->getType()->getAs<FunctionProtoType>();
2883 if (CPT->getExceptionSpecType() == EST_Delayed)
2885 if (!CPT->isNothrow(Self.Context))
2894 case UTT_HasNothrowCopy:
2895 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2896 // If __has_trivial_copy (type) is true then the trait is true, else
2897 // if type is a cv class or union type with copy constructors that are
2898 // known not to throw an exception then the trait is true, else it is
2900 if (T.isPODType(C) || T->isReferenceType() || T->isObjCLifetimeType())
2902 if (const RecordType *RT = T->getAs<RecordType>()) {
2903 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
2904 if (RD->hasTrivialCopyConstructor())
2907 bool FoundConstructor = false;
2909 DeclContext::lookup_const_iterator Con, ConEnd;
2910 for (llvm::tie(Con, ConEnd) = Self.LookupConstructors(RD);
2911 Con != ConEnd; ++Con) {
2912 // A template constructor is never a copy constructor.
2913 // FIXME: However, it may actually be selected at the actual overload
2914 // resolution point.
2915 if (isa<FunctionTemplateDecl>(*Con))
2917 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con);
2918 if (Constructor->isCopyConstructor(FoundTQs)) {
2919 FoundConstructor = true;
2920 const FunctionProtoType *CPT
2921 = Constructor->getType()->getAs<FunctionProtoType>();
2922 if (CPT->getExceptionSpecType() == EST_Delayed)
2924 // FIXME: check whether evaluating default arguments can throw.
2925 // For now, we'll be conservative and assume that they can throw.
2926 if (!CPT->isNothrow(Self.Context) || CPT->getNumArgs() > 1)
2931 return FoundConstructor;
2934 case UTT_HasNothrowConstructor:
2935 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2936 // If __has_trivial_constructor (type) is true then the trait is
2937 // true, else if type is a cv class or union type (or array
2938 // thereof) with a default constructor that is known not to
2939 // throw an exception then the trait is true, else it is false.
2940 if (T.isPODType(C) || T->isObjCLifetimeType())
2942 if (const RecordType *RT = C.getBaseElementType(T)->getAs<RecordType>()) {
2943 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
2944 if (RD->hasTrivialDefaultConstructor())
2947 DeclContext::lookup_const_iterator Con, ConEnd;
2948 for (llvm::tie(Con, ConEnd) = Self.LookupConstructors(RD);
2949 Con != ConEnd; ++Con) {
2950 // FIXME: In C++0x, a constructor template can be a default constructor.
2951 if (isa<FunctionTemplateDecl>(*Con))
2953 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con);
2954 if (Constructor->isDefaultConstructor()) {
2955 const FunctionProtoType *CPT
2956 = Constructor->getType()->getAs<FunctionProtoType>();
2957 if (CPT->getExceptionSpecType() == EST_Delayed)
2959 // TODO: check whether evaluating default arguments can throw.
2960 // For now, we'll be conservative and assume that they can throw.
2961 return CPT->isNothrow(Self.Context) && CPT->getNumArgs() == 0;
2966 case UTT_HasVirtualDestructor:
2967 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2968 // If type is a class type with a virtual destructor ([class.dtor])
2969 // then the trait is true, else it is false.
2970 if (const RecordType *Record = T->getAs<RecordType>()) {
2971 CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
2972 if (CXXDestructorDecl *Destructor = Self.LookupDestructor(RD))
2973 return Destructor->isVirtual();
2977 // These type trait expressions are modeled on the specifications for the
2978 // Embarcadero C++0x type trait functions:
2979 // http://docwiki.embarcadero.com/RADStudio/XE/en/Type_Trait_Functions_(C%2B%2B0x)_Index
2980 case UTT_IsCompleteType:
2981 // http://docwiki.embarcadero.com/RADStudio/XE/en/Is_complete_type_(typename_T_):
2982 // Returns True if and only if T is a complete type at the point of the
2984 return !T->isIncompleteType();
2986 llvm_unreachable("Type trait not covered by switch");
2989 ExprResult Sema::BuildUnaryTypeTrait(UnaryTypeTrait UTT,
2990 SourceLocation KWLoc,
2991 TypeSourceInfo *TSInfo,
2992 SourceLocation RParen) {
2993 QualType T = TSInfo->getType();
2994 if (!CheckUnaryTypeTraitTypeCompleteness(*this, UTT, KWLoc, T))
2998 if (!T->isDependentType())
2999 Value = EvaluateUnaryTypeTrait(*this, UTT, KWLoc, T);
3001 return Owned(new (Context) UnaryTypeTraitExpr(KWLoc, UTT, TSInfo, Value,
3002 RParen, Context.BoolTy));
3005 ExprResult Sema::ActOnBinaryTypeTrait(BinaryTypeTrait BTT,
3006 SourceLocation KWLoc,
3009 SourceLocation RParen) {
3010 TypeSourceInfo *LhsTSInfo;
3011 QualType LhsT = GetTypeFromParser(LhsTy, &LhsTSInfo);
3013 LhsTSInfo = Context.getTrivialTypeSourceInfo(LhsT);
3015 TypeSourceInfo *RhsTSInfo;
3016 QualType RhsT = GetTypeFromParser(RhsTy, &RhsTSInfo);
3018 RhsTSInfo = Context.getTrivialTypeSourceInfo(RhsT);
3020 return BuildBinaryTypeTrait(BTT, KWLoc, LhsTSInfo, RhsTSInfo, RParen);
3023 static bool EvaluateBinaryTypeTrait(Sema &Self, BinaryTypeTrait BTT,
3024 QualType LhsT, QualType RhsT,
3025 SourceLocation KeyLoc) {
3026 assert(!LhsT->isDependentType() && !RhsT->isDependentType() &&
3027 "Cannot evaluate traits of dependent types");
3030 case BTT_IsBaseOf: {
3031 // C++0x [meta.rel]p2
3032 // Base is a base class of Derived without regard to cv-qualifiers or
3033 // Base and Derived are not unions and name the same class type without
3034 // regard to cv-qualifiers.
3036 const RecordType *lhsRecord = LhsT->getAs<RecordType>();
3037 if (!lhsRecord) return false;
3039 const RecordType *rhsRecord = RhsT->getAs<RecordType>();
3040 if (!rhsRecord) return false;
3042 assert(Self.Context.hasSameUnqualifiedType(LhsT, RhsT)
3043 == (lhsRecord == rhsRecord));
3045 if (lhsRecord == rhsRecord)
3046 return !lhsRecord->getDecl()->isUnion();
3048 // C++0x [meta.rel]p2:
3049 // If Base and Derived are class types and are different types
3050 // (ignoring possible cv-qualifiers) then Derived shall be a
3052 if (Self.RequireCompleteType(KeyLoc, RhsT,
3053 diag::err_incomplete_type_used_in_type_trait_expr))
3056 return cast<CXXRecordDecl>(rhsRecord->getDecl())
3057 ->isDerivedFrom(cast<CXXRecordDecl>(lhsRecord->getDecl()));
3060 return Self.Context.hasSameType(LhsT, RhsT);
3061 case BTT_TypeCompatible:
3062 return Self.Context.typesAreCompatible(LhsT.getUnqualifiedType(),
3063 RhsT.getUnqualifiedType());
3064 case BTT_IsConvertible:
3065 case BTT_IsConvertibleTo: {
3066 // C++0x [meta.rel]p4:
3067 // Given the following function prototype:
3069 // template <class T>
3070 // typename add_rvalue_reference<T>::type create();
3072 // the predicate condition for a template specialization
3073 // is_convertible<From, To> shall be satisfied if and only if
3074 // the return expression in the following code would be
3075 // well-formed, including any implicit conversions to the return
3076 // type of the function:
3079 // return create<From>();
3082 // Access checking is performed as if in a context unrelated to To and
3083 // From. Only the validity of the immediate context of the expression
3084 // of the return-statement (including conversions to the return type)
3087 // We model the initialization as a copy-initialization of a temporary
3088 // of the appropriate type, which for this expression is identical to the
3089 // return statement (since NRVO doesn't apply).
3090 if (LhsT->isObjectType() || LhsT->isFunctionType())
3091 LhsT = Self.Context.getRValueReferenceType(LhsT);
3093 InitializedEntity To(InitializedEntity::InitializeTemporary(RhsT));
3094 OpaqueValueExpr From(KeyLoc, LhsT.getNonLValueExprType(Self.Context),
3095 Expr::getValueKindForType(LhsT));
3096 Expr *FromPtr = &From;
3097 InitializationKind Kind(InitializationKind::CreateCopy(KeyLoc,
3100 // Perform the initialization within a SFINAE trap at translation unit
3102 Sema::SFINAETrap SFINAE(Self, /*AccessCheckingSFINAE=*/true);
3103 Sema::ContextRAII TUContext(Self, Self.Context.getTranslationUnitDecl());
3104 InitializationSequence Init(Self, To, Kind, &FromPtr, 1);
3108 ExprResult Result = Init.Perform(Self, To, Kind, MultiExprArg(&FromPtr, 1));
3109 return !Result.isInvalid() && !SFINAE.hasErrorOccurred();
3112 llvm_unreachable("Unknown type trait or not implemented");
3115 ExprResult Sema::BuildBinaryTypeTrait(BinaryTypeTrait BTT,
3116 SourceLocation KWLoc,
3117 TypeSourceInfo *LhsTSInfo,
3118 TypeSourceInfo *RhsTSInfo,
3119 SourceLocation RParen) {
3120 QualType LhsT = LhsTSInfo->getType();
3121 QualType RhsT = RhsTSInfo->getType();
3123 if (BTT == BTT_TypeCompatible) {
3124 if (getLangOptions().CPlusPlus) {
3125 Diag(KWLoc, diag::err_types_compatible_p_in_cplusplus)
3126 << SourceRange(KWLoc, RParen);
3132 if (!LhsT->isDependentType() && !RhsT->isDependentType())
3133 Value = EvaluateBinaryTypeTrait(*this, BTT, LhsT, RhsT, KWLoc);
3135 // Select trait result type.
3136 QualType ResultType;
3138 case BTT_IsBaseOf: ResultType = Context.BoolTy; break;
3139 case BTT_IsConvertible: ResultType = Context.BoolTy; break;
3140 case BTT_IsSame: ResultType = Context.BoolTy; break;
3141 case BTT_TypeCompatible: ResultType = Context.IntTy; break;
3142 case BTT_IsConvertibleTo: ResultType = Context.BoolTy; break;
3145 return Owned(new (Context) BinaryTypeTraitExpr(KWLoc, BTT, LhsTSInfo,
3146 RhsTSInfo, Value, RParen,
3150 ExprResult Sema::ActOnArrayTypeTrait(ArrayTypeTrait ATT,
3151 SourceLocation KWLoc,
3154 SourceLocation RParen) {
3155 TypeSourceInfo *TSInfo;
3156 QualType T = GetTypeFromParser(Ty, &TSInfo);
3158 TSInfo = Context.getTrivialTypeSourceInfo(T);
3160 return BuildArrayTypeTrait(ATT, KWLoc, TSInfo, DimExpr, RParen);
3163 static uint64_t EvaluateArrayTypeTrait(Sema &Self, ArrayTypeTrait ATT,
3164 QualType T, Expr *DimExpr,
3165 SourceLocation KeyLoc) {
3166 assert(!T->isDependentType() && "Cannot evaluate traits of dependent type");
3170 if (T->isArrayType()) {
3172 while (const ArrayType *AT = Self.Context.getAsArrayType(T)) {
3174 T = AT->getElementType();
3180 case ATT_ArrayExtent: {
3183 if (DimExpr->isIntegerConstantExpr(Value, Self.Context, 0, false)) {
3184 if (Value < llvm::APSInt(Value.getBitWidth(), Value.isUnsigned())) {
3185 Self.Diag(KeyLoc, diag::err_dimension_expr_not_constant_integer) <<
3186 DimExpr->getSourceRange();
3189 Dim = Value.getLimitedValue();
3191 Self.Diag(KeyLoc, diag::err_dimension_expr_not_constant_integer) <<
3192 DimExpr->getSourceRange();
3196 if (T->isArrayType()) {
3198 bool Matched = false;
3199 while (const ArrayType *AT = Self.Context.getAsArrayType(T)) {
3205 T = AT->getElementType();
3208 if (Matched && T->isArrayType()) {
3209 if (const ConstantArrayType *CAT = Self.Context.getAsConstantArrayType(T))
3210 return CAT->getSize().getLimitedValue();
3216 llvm_unreachable("Unknown type trait or not implemented");
3219 ExprResult Sema::BuildArrayTypeTrait(ArrayTypeTrait ATT,
3220 SourceLocation KWLoc,
3221 TypeSourceInfo *TSInfo,
3223 SourceLocation RParen) {
3224 QualType T = TSInfo->getType();
3226 // FIXME: This should likely be tracked as an APInt to remove any host
3227 // assumptions about the width of size_t on the target.
3229 if (!T->isDependentType())
3230 Value = EvaluateArrayTypeTrait(*this, ATT, T, DimExpr, KWLoc);
3232 // While the specification for these traits from the Embarcadero C++
3233 // compiler's documentation says the return type is 'unsigned int', Clang
3234 // returns 'size_t'. On Windows, the primary platform for the Embarcadero
3235 // compiler, there is no difference. On several other platforms this is an
3236 // important distinction.
3237 return Owned(new (Context) ArrayTypeTraitExpr(KWLoc, ATT, TSInfo, Value,
3239 Context.getSizeType()));
3242 ExprResult Sema::ActOnExpressionTrait(ExpressionTrait ET,
3243 SourceLocation KWLoc,
3245 SourceLocation RParen) {
3246 // If error parsing the expression, ignore.
3250 ExprResult Result = BuildExpressionTrait(ET, KWLoc, Queried, RParen);
3252 return move(Result);
3255 static bool EvaluateExpressionTrait(ExpressionTrait ET, Expr *E) {
3257 case ET_IsLValueExpr: return E->isLValue();
3258 case ET_IsRValueExpr: return E->isRValue();
3260 llvm_unreachable("Expression trait not covered by switch");
3263 ExprResult Sema::BuildExpressionTrait(ExpressionTrait ET,
3264 SourceLocation KWLoc,
3266 SourceLocation RParen) {
3267 if (Queried->isTypeDependent()) {
3268 // Delay type-checking for type-dependent expressions.
3269 } else if (Queried->getType()->isPlaceholderType()) {
3270 ExprResult PE = CheckPlaceholderExpr(Queried);
3271 if (PE.isInvalid()) return ExprError();
3272 return BuildExpressionTrait(ET, KWLoc, PE.take(), RParen);
3275 bool Value = EvaluateExpressionTrait(ET, Queried);
3277 return Owned(new (Context) ExpressionTraitExpr(KWLoc, ET, Queried, Value,
3278 RParen, Context.BoolTy));
3281 QualType Sema::CheckPointerToMemberOperands(ExprResult &LHS, ExprResult &RHS,
3285 assert(!LHS.get()->getType()->isPlaceholderType() &&
3286 !RHS.get()->getType()->isPlaceholderType() &&
3287 "placeholders should have been weeded out by now");
3289 // The LHS undergoes lvalue conversions if this is ->*.
3291 LHS = DefaultLvalueConversion(LHS.take());
3292 if (LHS.isInvalid()) return QualType();
3295 // The RHS always undergoes lvalue conversions.
3296 RHS = DefaultLvalueConversion(RHS.take());
3297 if (RHS.isInvalid()) return QualType();
3299 const char *OpSpelling = isIndirect ? "->*" : ".*";
3301 // The binary operator .* [p3: ->*] binds its second operand, which shall
3302 // be of type "pointer to member of T" (where T is a completely-defined
3303 // class type) [...]
3304 QualType RHSType = RHS.get()->getType();
3305 const MemberPointerType *MemPtr = RHSType->getAs<MemberPointerType>();
3307 Diag(Loc, diag::err_bad_memptr_rhs)
3308 << OpSpelling << RHSType << RHS.get()->getSourceRange();
3312 QualType Class(MemPtr->getClass(), 0);
3314 // Note: C++ [expr.mptr.oper]p2-3 says that the class type into which the
3315 // member pointer points must be completely-defined. However, there is no
3316 // reason for this semantic distinction, and the rule is not enforced by
3317 // other compilers. Therefore, we do not check this property, as it is
3318 // likely to be considered a defect.
3321 // [...] to its first operand, which shall be of class T or of a class of
3322 // which T is an unambiguous and accessible base class. [p3: a pointer to
3324 QualType LHSType = LHS.get()->getType();
3326 if (const PointerType *Ptr = LHSType->getAs<PointerType>())
3327 LHSType = Ptr->getPointeeType();
3329 Diag(Loc, diag::err_bad_memptr_lhs)
3330 << OpSpelling << 1 << LHSType
3331 << FixItHint::CreateReplacement(SourceRange(Loc), ".*");
3336 if (!Context.hasSameUnqualifiedType(Class, LHSType)) {
3337 // If we want to check the hierarchy, we need a complete type.
3338 if (RequireCompleteType(Loc, LHSType, PDiag(diag::err_bad_memptr_lhs)
3339 << OpSpelling << (int)isIndirect)) {
3342 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
3343 /*DetectVirtual=*/false);
3344 // FIXME: Would it be useful to print full ambiguity paths, or is that
3346 if (!IsDerivedFrom(LHSType, Class, Paths) ||
3347 Paths.isAmbiguous(Context.getCanonicalType(Class))) {
3348 Diag(Loc, diag::err_bad_memptr_lhs) << OpSpelling
3349 << (int)isIndirect << LHS.get()->getType();
3352 // Cast LHS to type of use.
3353 QualType UseType = isIndirect ? Context.getPointerType(Class) : Class;
3354 ExprValueKind VK = isIndirect ? VK_RValue : LHS.get()->getValueKind();
3356 CXXCastPath BasePath;
3357 BuildBasePathArray(Paths, BasePath);
3358 LHS = ImpCastExprToType(LHS.take(), UseType, CK_DerivedToBase, VK,
3362 if (isa<CXXScalarValueInitExpr>(RHS.get()->IgnoreParens())) {
3363 // Diagnose use of pointer-to-member type which when used as
3364 // the functional cast in a pointer-to-member expression.
3365 Diag(Loc, diag::err_pointer_to_member_type) << isIndirect;
3370 // The result is an object or a function of the type specified by the
3372 // The cv qualifiers are the union of those in the pointer and the left side,
3373 // in accordance with 5.5p5 and 5.2.5.
3374 QualType Result = MemPtr->getPointeeType();
3375 Result = Context.getCVRQualifiedType(Result, LHSType.getCVRQualifiers());
3377 // C++0x [expr.mptr.oper]p6:
3378 // In a .* expression whose object expression is an rvalue, the program is
3379 // ill-formed if the second operand is a pointer to member function with
3380 // ref-qualifier &. In a ->* expression or in a .* expression whose object
3381 // expression is an lvalue, the program is ill-formed if the second operand
3382 // is a pointer to member function with ref-qualifier &&.
3383 if (const FunctionProtoType *Proto = Result->getAs<FunctionProtoType>()) {
3384 switch (Proto->getRefQualifier()) {
3390 if (!isIndirect && !LHS.get()->Classify(Context).isLValue())
3391 Diag(Loc, diag::err_pointer_to_member_oper_value_classify)
3392 << RHSType << 1 << LHS.get()->getSourceRange();
3396 if (isIndirect || !LHS.get()->Classify(Context).isRValue())
3397 Diag(Loc, diag::err_pointer_to_member_oper_value_classify)
3398 << RHSType << 0 << LHS.get()->getSourceRange();
3403 // C++ [expr.mptr.oper]p6:
3404 // The result of a .* expression whose second operand is a pointer
3405 // to a data member is of the same value category as its
3406 // first operand. The result of a .* expression whose second
3407 // operand is a pointer to a member function is a prvalue. The
3408 // result of an ->* expression is an lvalue if its second operand
3409 // is a pointer to data member and a prvalue otherwise.
3410 if (Result->isFunctionType()) {
3412 return Context.BoundMemberTy;
3413 } else if (isIndirect) {
3416 VK = LHS.get()->getValueKind();
3422 /// \brief Try to convert a type to another according to C++0x 5.16p3.
3424 /// This is part of the parameter validation for the ? operator. If either
3425 /// value operand is a class type, the two operands are attempted to be
3426 /// converted to each other. This function does the conversion in one direction.
3427 /// It returns true if the program is ill-formed and has already been diagnosed
3429 static bool TryClassUnification(Sema &Self, Expr *From, Expr *To,
3430 SourceLocation QuestionLoc,
3431 bool &HaveConversion,
3433 HaveConversion = false;
3434 ToType = To->getType();
3436 InitializationKind Kind = InitializationKind::CreateCopy(To->getLocStart(),
3439 // The process for determining whether an operand expression E1 of type T1
3440 // can be converted to match an operand expression E2 of type T2 is defined
3442 // -- If E2 is an lvalue:
3443 bool ToIsLvalue = To->isLValue();
3445 // E1 can be converted to match E2 if E1 can be implicitly converted to
3446 // type "lvalue reference to T2", subject to the constraint that in the
3447 // conversion the reference must bind directly to E1.
3448 QualType T = Self.Context.getLValueReferenceType(ToType);
3449 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T);
3451 InitializationSequence InitSeq(Self, Entity, Kind, &From, 1);
3452 if (InitSeq.isDirectReferenceBinding()) {
3454 HaveConversion = true;
3458 if (InitSeq.isAmbiguous())
3459 return InitSeq.Diagnose(Self, Entity, Kind, &From, 1);
3462 // -- If E2 is an rvalue, or if the conversion above cannot be done:
3463 // -- if E1 and E2 have class type, and the underlying class types are
3464 // the same or one is a base class of the other:
3465 QualType FTy = From->getType();
3466 QualType TTy = To->getType();
3467 const RecordType *FRec = FTy->getAs<RecordType>();
3468 const RecordType *TRec = TTy->getAs<RecordType>();
3469 bool FDerivedFromT = FRec && TRec && FRec != TRec &&
3470 Self.IsDerivedFrom(FTy, TTy);
3472 (FRec == TRec || FDerivedFromT || Self.IsDerivedFrom(TTy, FTy))) {
3473 // E1 can be converted to match E2 if the class of T2 is the
3474 // same type as, or a base class of, the class of T1, and
3476 if (FRec == TRec || FDerivedFromT) {
3477 if (TTy.isAtLeastAsQualifiedAs(FTy)) {
3478 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy);
3479 InitializationSequence InitSeq(Self, Entity, Kind, &From, 1);
3481 HaveConversion = true;
3485 if (InitSeq.isAmbiguous())
3486 return InitSeq.Diagnose(Self, Entity, Kind, &From, 1);
3493 // -- Otherwise: E1 can be converted to match E2 if E1 can be
3494 // implicitly converted to the type that expression E2 would have
3495 // if E2 were converted to an rvalue (or the type it has, if E2 is
3498 // This actually refers very narrowly to the lvalue-to-rvalue conversion, not
3499 // to the array-to-pointer or function-to-pointer conversions.
3500 if (!TTy->getAs<TagType>())
3501 TTy = TTy.getUnqualifiedType();
3503 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy);
3504 InitializationSequence InitSeq(Self, Entity, Kind, &From, 1);
3505 HaveConversion = !InitSeq.Failed();
3507 if (InitSeq.isAmbiguous())
3508 return InitSeq.Diagnose(Self, Entity, Kind, &From, 1);
3513 /// \brief Try to find a common type for two according to C++0x 5.16p5.
3515 /// This is part of the parameter validation for the ? operator. If either
3516 /// value operand is a class type, overload resolution is used to find a
3517 /// conversion to a common type.
3518 static bool FindConditionalOverload(Sema &Self, ExprResult &LHS, ExprResult &RHS,
3519 SourceLocation QuestionLoc) {
3520 Expr *Args[2] = { LHS.get(), RHS.get() };
3521 OverloadCandidateSet CandidateSet(QuestionLoc);
3522 Self.AddBuiltinOperatorCandidates(OO_Conditional, QuestionLoc, Args, 2,
3525 OverloadCandidateSet::iterator Best;
3526 switch (CandidateSet.BestViableFunction(Self, QuestionLoc, Best)) {
3528 // We found a match. Perform the conversions on the arguments and move on.
3530 Self.PerformImplicitConversion(LHS.get(), Best->BuiltinTypes.ParamTypes[0],
3531 Best->Conversions[0], Sema::AA_Converting);
3532 if (LHSRes.isInvalid())
3537 Self.PerformImplicitConversion(RHS.get(), Best->BuiltinTypes.ParamTypes[1],
3538 Best->Conversions[1], Sema::AA_Converting);
3539 if (RHSRes.isInvalid())
3543 Self.MarkDeclarationReferenced(QuestionLoc, Best->Function);
3547 case OR_No_Viable_Function:
3549 // Emit a better diagnostic if one of the expressions is a null pointer
3550 // constant and the other is a pointer type. In this case, the user most
3551 // likely forgot to take the address of the other expression.
3552 if (Self.DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
3555 Self.Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
3556 << LHS.get()->getType() << RHS.get()->getType()
3557 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
3561 Self.Diag(QuestionLoc, diag::err_conditional_ambiguous_ovl)
3562 << LHS.get()->getType() << RHS.get()->getType()
3563 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
3564 // FIXME: Print the possible common types by printing the return types of
3565 // the viable candidates.
3569 llvm_unreachable("Conditional operator has only built-in overloads");
3574 /// \brief Perform an "extended" implicit conversion as returned by
3575 /// TryClassUnification.
3576 static bool ConvertForConditional(Sema &Self, ExprResult &E, QualType T) {
3577 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T);
3578 InitializationKind Kind = InitializationKind::CreateCopy(E.get()->getLocStart(),
3580 Expr *Arg = E.take();
3581 InitializationSequence InitSeq(Self, Entity, Kind, &Arg, 1);
3582 ExprResult Result = InitSeq.Perform(Self, Entity, Kind, MultiExprArg(&Arg, 1));
3583 if (Result.isInvalid())
3590 /// \brief Check the operands of ?: under C++ semantics.
3592 /// See C++ [expr.cond]. Note that LHS is never null, even for the GNU x ?: y
3593 /// extension. In this case, LHS == Cond. (But they're not aliases.)
3594 QualType Sema::CXXCheckConditionalOperands(ExprResult &Cond, ExprResult &LHS, ExprResult &RHS,
3595 ExprValueKind &VK, ExprObjectKind &OK,
3596 SourceLocation QuestionLoc) {
3597 // FIXME: Handle C99's complex types, vector types, block pointers and Obj-C++
3598 // interface pointers.
3601 // The first expression is contextually converted to bool.
3602 if (!Cond.get()->isTypeDependent()) {
3603 ExprResult CondRes = CheckCXXBooleanCondition(Cond.take());
3604 if (CondRes.isInvalid())
3606 Cond = move(CondRes);
3613 // Either of the arguments dependent?
3614 if (LHS.get()->isTypeDependent() || RHS.get()->isTypeDependent())
3615 return Context.DependentTy;
3618 // If either the second or the third operand has type (cv) void, ...
3619 QualType LTy = LHS.get()->getType();
3620 QualType RTy = RHS.get()->getType();
3621 bool LVoid = LTy->isVoidType();
3622 bool RVoid = RTy->isVoidType();
3623 if (LVoid || RVoid) {
3624 // ... then the [l2r] conversions are performed on the second and third
3626 LHS = DefaultFunctionArrayLvalueConversion(LHS.take());
3627 RHS = DefaultFunctionArrayLvalueConversion(RHS.take());
3628 if (LHS.isInvalid() || RHS.isInvalid())
3630 LTy = LHS.get()->getType();
3631 RTy = RHS.get()->getType();
3633 // ... and one of the following shall hold:
3634 // -- The second or the third operand (but not both) is a throw-
3635 // expression; the result is of the type of the other and is an rvalue.
3636 bool LThrow = isa<CXXThrowExpr>(LHS.get());
3637 bool RThrow = isa<CXXThrowExpr>(RHS.get());
3638 if (LThrow && !RThrow)
3640 if (RThrow && !LThrow)
3643 // -- Both the second and third operands have type void; the result is of
3644 // type void and is an rvalue.
3646 return Context.VoidTy;
3648 // Neither holds, error.
3649 Diag(QuestionLoc, diag::err_conditional_void_nonvoid)
3650 << (LVoid ? RTy : LTy) << (LVoid ? 0 : 1)
3651 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
3658 // Otherwise, if the second and third operand have different types, and
3659 // either has (cv) class type, and attempt is made to convert each of those
3660 // operands to the other.
3661 if (!Context.hasSameType(LTy, RTy) &&
3662 (LTy->isRecordType() || RTy->isRecordType())) {
3663 ImplicitConversionSequence ICSLeftToRight, ICSRightToLeft;
3664 // These return true if a single direction is already ambiguous.
3665 QualType L2RType, R2LType;
3666 bool HaveL2R, HaveR2L;
3667 if (TryClassUnification(*this, LHS.get(), RHS.get(), QuestionLoc, HaveL2R, L2RType))
3669 if (TryClassUnification(*this, RHS.get(), LHS.get(), QuestionLoc, HaveR2L, R2LType))
3672 // If both can be converted, [...] the program is ill-formed.
3673 if (HaveL2R && HaveR2L) {
3674 Diag(QuestionLoc, diag::err_conditional_ambiguous)
3675 << LTy << RTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
3679 // If exactly one conversion is possible, that conversion is applied to
3680 // the chosen operand and the converted operands are used in place of the
3681 // original operands for the remainder of this section.
3683 if (ConvertForConditional(*this, LHS, L2RType) || LHS.isInvalid())
3685 LTy = LHS.get()->getType();
3686 } else if (HaveR2L) {
3687 if (ConvertForConditional(*this, RHS, R2LType) || RHS.isInvalid())
3689 RTy = RHS.get()->getType();
3694 // If the second and third operands are glvalues of the same value
3695 // category and have the same type, the result is of that type and
3696 // value category and it is a bit-field if the second or the third
3697 // operand is a bit-field, or if both are bit-fields.
3698 // We only extend this to bitfields, not to the crazy other kinds of
3700 bool Same = Context.hasSameType(LTy, RTy);
3702 LHS.get()->isGLValue() &&
3703 LHS.get()->getValueKind() == RHS.get()->getValueKind() &&
3704 LHS.get()->isOrdinaryOrBitFieldObject() &&
3705 RHS.get()->isOrdinaryOrBitFieldObject()) {
3706 VK = LHS.get()->getValueKind();
3707 if (LHS.get()->getObjectKind() == OK_BitField ||
3708 RHS.get()->getObjectKind() == OK_BitField)
3714 // Otherwise, the result is an rvalue. If the second and third operands
3715 // do not have the same type, and either has (cv) class type, ...
3716 if (!Same && (LTy->isRecordType() || RTy->isRecordType())) {
3717 // ... overload resolution is used to determine the conversions (if any)
3718 // to be applied to the operands. If the overload resolution fails, the
3719 // program is ill-formed.
3720 if (FindConditionalOverload(*this, LHS, RHS, QuestionLoc))
3725 // LValue-to-rvalue, array-to-pointer, and function-to-pointer standard
3726 // conversions are performed on the second and third operands.
3727 LHS = DefaultFunctionArrayLvalueConversion(LHS.take());
3728 RHS = DefaultFunctionArrayLvalueConversion(RHS.take());
3729 if (LHS.isInvalid() || RHS.isInvalid())
3731 LTy = LHS.get()->getType();
3732 RTy = RHS.get()->getType();
3734 // After those conversions, one of the following shall hold:
3735 // -- The second and third operands have the same type; the result
3736 // is of that type. If the operands have class type, the result
3737 // is a prvalue temporary of the result type, which is
3738 // copy-initialized from either the second operand or the third
3739 // operand depending on the value of the first operand.
3740 if (Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy)) {
3741 if (LTy->isRecordType()) {
3742 // The operands have class type. Make a temporary copy.
3743 InitializedEntity Entity = InitializedEntity::InitializeTemporary(LTy);
3744 ExprResult LHSCopy = PerformCopyInitialization(Entity,
3747 if (LHSCopy.isInvalid())
3750 ExprResult RHSCopy = PerformCopyInitialization(Entity,
3753 if (RHSCopy.isInvalid())
3763 // Extension: conditional operator involving vector types.
3764 if (LTy->isVectorType() || RTy->isVectorType())
3765 return CheckVectorOperands(LHS, RHS, QuestionLoc, /*isCompAssign*/false);
3767 // -- The second and third operands have arithmetic or enumeration type;
3768 // the usual arithmetic conversions are performed to bring them to a
3769 // common type, and the result is of that type.
3770 if (LTy->isArithmeticType() && RTy->isArithmeticType()) {
3771 UsualArithmeticConversions(LHS, RHS);
3772 if (LHS.isInvalid() || RHS.isInvalid())
3774 return LHS.get()->getType();
3777 // -- The second and third operands have pointer type, or one has pointer
3778 // type and the other is a null pointer constant; pointer conversions
3779 // and qualification conversions are performed to bring them to their
3780 // composite pointer type. The result is of the composite pointer type.
3781 // -- The second and third operands have pointer to member type, or one has
3782 // pointer to member type and the other is a null pointer constant;
3783 // pointer to member conversions and qualification conversions are
3784 // performed to bring them to a common type, whose cv-qualification
3785 // shall match the cv-qualification of either the second or the third
3786 // operand. The result is of the common type.
3787 bool NonStandardCompositeType = false;
3788 QualType Composite = FindCompositePointerType(QuestionLoc, LHS, RHS,
3789 isSFINAEContext()? 0 : &NonStandardCompositeType);
3790 if (!Composite.isNull()) {
3791 if (NonStandardCompositeType)
3793 diag::ext_typecheck_cond_incompatible_operands_nonstandard)
3794 << LTy << RTy << Composite
3795 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
3800 // Similarly, attempt to find composite type of two objective-c pointers.
3801 Composite = FindCompositeObjCPointerType(LHS, RHS, QuestionLoc);
3802 if (!Composite.isNull())
3805 // Check if we are using a null with a non-pointer type.
3806 if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
3809 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
3810 << LHS.get()->getType() << RHS.get()->getType()
3811 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
3815 /// \brief Find a merged pointer type and convert the two expressions to it.
3817 /// This finds the composite pointer type (or member pointer type) for @p E1
3818 /// and @p E2 according to C++0x 5.9p2. It converts both expressions to this
3819 /// type and returns it.
3820 /// It does not emit diagnostics.
3822 /// \param Loc The location of the operator requiring these two expressions to
3823 /// be converted to the composite pointer type.
3825 /// If \p NonStandardCompositeType is non-NULL, then we are permitted to find
3826 /// a non-standard (but still sane) composite type to which both expressions
3827 /// can be converted. When such a type is chosen, \c *NonStandardCompositeType
3828 /// will be set true.
3829 QualType Sema::FindCompositePointerType(SourceLocation Loc,
3830 Expr *&E1, Expr *&E2,
3831 bool *NonStandardCompositeType) {
3832 if (NonStandardCompositeType)
3833 *NonStandardCompositeType = false;
3835 assert(getLangOptions().CPlusPlus && "This function assumes C++");
3836 QualType T1 = E1->getType(), T2 = E2->getType();
3838 if (!T1->isAnyPointerType() && !T1->isMemberPointerType() &&
3839 !T2->isAnyPointerType() && !T2->isMemberPointerType())
3843 // Pointer conversions and qualification conversions are performed on
3844 // pointer operands to bring them to their composite pointer type. If
3845 // one operand is a null pointer constant, the composite pointer type is
3846 // the type of the other operand.
3847 if (E1->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
3848 if (T2->isMemberPointerType())
3849 E1 = ImpCastExprToType(E1, T2, CK_NullToMemberPointer).take();
3851 E1 = ImpCastExprToType(E1, T2, CK_NullToPointer).take();
3854 if (E2->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
3855 if (T1->isMemberPointerType())
3856 E2 = ImpCastExprToType(E2, T1, CK_NullToMemberPointer).take();
3858 E2 = ImpCastExprToType(E2, T1, CK_NullToPointer).take();
3862 // Now both have to be pointers or member pointers.
3863 if ((!T1->isPointerType() && !T1->isMemberPointerType()) ||
3864 (!T2->isPointerType() && !T2->isMemberPointerType()))
3867 // Otherwise, of one of the operands has type "pointer to cv1 void," then
3868 // the other has type "pointer to cv2 T" and the composite pointer type is
3869 // "pointer to cv12 void," where cv12 is the union of cv1 and cv2.
3870 // Otherwise, the composite pointer type is a pointer type similar to the
3871 // type of one of the operands, with a cv-qualification signature that is
3872 // the union of the cv-qualification signatures of the operand types.
3873 // In practice, the first part here is redundant; it's subsumed by the second.
3874 // What we do here is, we build the two possible composite types, and try the
3875 // conversions in both directions. If only one works, or if the two composite
3876 // types are the same, we have succeeded.
3877 // FIXME: extended qualifiers?
3878 typedef SmallVector<unsigned, 4> QualifierVector;
3879 QualifierVector QualifierUnion;
3880 typedef SmallVector<std::pair<const Type *, const Type *>, 4>
3881 ContainingClassVector;
3882 ContainingClassVector MemberOfClass;
3883 QualType Composite1 = Context.getCanonicalType(T1),
3884 Composite2 = Context.getCanonicalType(T2);
3885 unsigned NeedConstBefore = 0;
3887 const PointerType *Ptr1, *Ptr2;
3888 if ((Ptr1 = Composite1->getAs<PointerType>()) &&
3889 (Ptr2 = Composite2->getAs<PointerType>())) {
3890 Composite1 = Ptr1->getPointeeType();
3891 Composite2 = Ptr2->getPointeeType();
3893 // If we're allowed to create a non-standard composite type, keep track
3894 // of where we need to fill in additional 'const' qualifiers.
3895 if (NonStandardCompositeType &&
3896 Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers())
3897 NeedConstBefore = QualifierUnion.size();
3899 QualifierUnion.push_back(
3900 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
3901 MemberOfClass.push_back(std::make_pair((const Type *)0, (const Type *)0));
3905 const MemberPointerType *MemPtr1, *MemPtr2;
3906 if ((MemPtr1 = Composite1->getAs<MemberPointerType>()) &&
3907 (MemPtr2 = Composite2->getAs<MemberPointerType>())) {
3908 Composite1 = MemPtr1->getPointeeType();
3909 Composite2 = MemPtr2->getPointeeType();
3911 // If we're allowed to create a non-standard composite type, keep track
3912 // of where we need to fill in additional 'const' qualifiers.
3913 if (NonStandardCompositeType &&
3914 Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers())
3915 NeedConstBefore = QualifierUnion.size();
3917 QualifierUnion.push_back(
3918 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
3919 MemberOfClass.push_back(std::make_pair(MemPtr1->getClass(),
3920 MemPtr2->getClass()));
3924 // FIXME: block pointer types?
3926 // Cannot unwrap any more types.
3930 if (NeedConstBefore && NonStandardCompositeType) {
3931 // Extension: Add 'const' to qualifiers that come before the first qualifier
3932 // mismatch, so that our (non-standard!) composite type meets the
3933 // requirements of C++ [conv.qual]p4 bullet 3.
3934 for (unsigned I = 0; I != NeedConstBefore; ++I) {
3935 if ((QualifierUnion[I] & Qualifiers::Const) == 0) {
3936 QualifierUnion[I] = QualifierUnion[I] | Qualifiers::Const;
3937 *NonStandardCompositeType = true;
3942 // Rewrap the composites as pointers or member pointers with the union CVRs.
3943 ContainingClassVector::reverse_iterator MOC
3944 = MemberOfClass.rbegin();
3945 for (QualifierVector::reverse_iterator
3946 I = QualifierUnion.rbegin(),
3947 E = QualifierUnion.rend();
3948 I != E; (void)++I, ++MOC) {
3949 Qualifiers Quals = Qualifiers::fromCVRMask(*I);
3950 if (MOC->first && MOC->second) {
3951 // Rebuild member pointer type
3952 Composite1 = Context.getMemberPointerType(
3953 Context.getQualifiedType(Composite1, Quals),
3955 Composite2 = Context.getMemberPointerType(
3956 Context.getQualifiedType(Composite2, Quals),
3959 // Rebuild pointer type
3961 = Context.getPointerType(Context.getQualifiedType(Composite1, Quals));
3963 = Context.getPointerType(Context.getQualifiedType(Composite2, Quals));
3967 // Try to convert to the first composite pointer type.
3968 InitializedEntity Entity1
3969 = InitializedEntity::InitializeTemporary(Composite1);
3970 InitializationKind Kind
3971 = InitializationKind::CreateCopy(Loc, SourceLocation());
3972 InitializationSequence E1ToC1(*this, Entity1, Kind, &E1, 1);
3973 InitializationSequence E2ToC1(*this, Entity1, Kind, &E2, 1);
3975 if (E1ToC1 && E2ToC1) {
3976 // Conversion to Composite1 is viable.
3977 if (!Context.hasSameType(Composite1, Composite2)) {
3978 // Composite2 is a different type from Composite1. Check whether
3979 // Composite2 is also viable.
3980 InitializedEntity Entity2
3981 = InitializedEntity::InitializeTemporary(Composite2);
3982 InitializationSequence E1ToC2(*this, Entity2, Kind, &E1, 1);
3983 InitializationSequence E2ToC2(*this, Entity2, Kind, &E2, 1);
3984 if (E1ToC2 && E2ToC2) {
3985 // Both Composite1 and Composite2 are viable and are different;
3986 // this is an ambiguity.
3991 // Convert E1 to Composite1
3993 = E1ToC1.Perform(*this, Entity1, Kind, MultiExprArg(*this,&E1,1));
3994 if (E1Result.isInvalid())
3996 E1 = E1Result.takeAs<Expr>();
3998 // Convert E2 to Composite1
4000 = E2ToC1.Perform(*this, Entity1, Kind, MultiExprArg(*this,&E2,1));
4001 if (E2Result.isInvalid())
4003 E2 = E2Result.takeAs<Expr>();
4008 // Check whether Composite2 is viable.
4009 InitializedEntity Entity2
4010 = InitializedEntity::InitializeTemporary(Composite2);
4011 InitializationSequence E1ToC2(*this, Entity2, Kind, &E1, 1);
4012 InitializationSequence E2ToC2(*this, Entity2, Kind, &E2, 1);
4013 if (!E1ToC2 || !E2ToC2)
4016 // Convert E1 to Composite2
4018 = E1ToC2.Perform(*this, Entity2, Kind, MultiExprArg(*this, &E1, 1));
4019 if (E1Result.isInvalid())
4021 E1 = E1Result.takeAs<Expr>();
4023 // Convert E2 to Composite2
4025 = E2ToC2.Perform(*this, Entity2, Kind, MultiExprArg(*this, &E2, 1));
4026 if (E2Result.isInvalid())
4028 E2 = E2Result.takeAs<Expr>();
4033 ExprResult Sema::MaybeBindToTemporary(Expr *E) {
4037 assert(!isa<CXXBindTemporaryExpr>(E) && "Double-bound temporary?");
4039 // If the result is a glvalue, we shouldn't bind it.
4043 // In ARC, calls that return a retainable type can return retained,
4044 // in which case we have to insert a consuming cast.
4045 if (getLangOptions().ObjCAutoRefCount &&
4046 E->getType()->isObjCRetainableType()) {
4048 bool ReturnsRetained;
4050 // For actual calls, we compute this by examining the type of the
4052 if (CallExpr *Call = dyn_cast<CallExpr>(E)) {
4053 Expr *Callee = Call->getCallee()->IgnoreParens();
4054 QualType T = Callee->getType();
4056 if (T == Context.BoundMemberTy) {
4057 // Handle pointer-to-members.
4058 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(Callee))
4059 T = BinOp->getRHS()->getType();
4060 else if (MemberExpr *Mem = dyn_cast<MemberExpr>(Callee))
4061 T = Mem->getMemberDecl()->getType();
4064 if (const PointerType *Ptr = T->getAs<PointerType>())
4065 T = Ptr->getPointeeType();
4066 else if (const BlockPointerType *Ptr = T->getAs<BlockPointerType>())
4067 T = Ptr->getPointeeType();
4068 else if (const MemberPointerType *MemPtr = T->getAs<MemberPointerType>())
4069 T = MemPtr->getPointeeType();
4071 const FunctionType *FTy = T->getAs<FunctionType>();
4072 assert(FTy && "call to value not of function type?");
4073 ReturnsRetained = FTy->getExtInfo().getProducesResult();
4075 // ActOnStmtExpr arranges things so that StmtExprs of retainable
4076 // type always produce a +1 object.
4077 } else if (isa<StmtExpr>(E)) {
4078 ReturnsRetained = true;
4080 // For message sends and property references, we try to find an
4081 // actual method. FIXME: we should infer retention by selector in
4082 // cases where we don't have an actual method.
4084 ObjCMethodDecl *D = 0;
4085 if (ObjCMessageExpr *Send = dyn_cast<ObjCMessageExpr>(E)) {
4086 D = Send->getMethodDecl();
4088 CastExpr *CE = cast<CastExpr>(E);
4089 assert(CE->getCastKind() == CK_GetObjCProperty);
4090 const ObjCPropertyRefExpr *PRE = CE->getSubExpr()->getObjCProperty();
4091 D = (PRE->isImplicitProperty() ? PRE->getImplicitPropertyGetter() : 0);
4094 ReturnsRetained = (D && D->hasAttr<NSReturnsRetainedAttr>());
4096 // Don't do reclaims on performSelector calls; despite their
4097 // return type, the invoked method doesn't necessarily actually
4098 // return an object.
4099 if (!ReturnsRetained &&
4100 D && D->getMethodFamily() == OMF_performSelector)
4104 ExprNeedsCleanups = true;
4106 CastKind ck = (ReturnsRetained ? CK_ARCConsumeObject
4107 : CK_ARCReclaimReturnedObject);
4108 return Owned(ImplicitCastExpr::Create(Context, E->getType(), ck, E, 0,
4112 if (!getLangOptions().CPlusPlus)
4115 const RecordType *RT = E->getType()->getAs<RecordType>();
4119 // That should be enough to guarantee that this type is complete.
4120 // If it has a trivial destructor, we can avoid the extra copy.
4121 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
4122 if (RD->isInvalidDecl() || RD->hasTrivialDestructor())
4125 CXXDestructorDecl *Destructor = LookupDestructor(RD);
4127 CXXTemporary *Temp = CXXTemporary::Create(Context, Destructor);
4129 MarkDeclarationReferenced(E->getExprLoc(), Destructor);
4130 CheckDestructorAccess(E->getExprLoc(), Destructor,
4131 PDiag(diag::err_access_dtor_temp)
4134 ExprTemporaries.push_back(Temp);
4135 ExprNeedsCleanups = true;
4137 return Owned(CXXBindTemporaryExpr::Create(Context, Temp, E));
4140 Expr *Sema::MaybeCreateExprWithCleanups(Expr *SubExpr) {
4141 assert(SubExpr && "sub expression can't be null!");
4143 unsigned FirstTemporary = ExprEvalContexts.back().NumTemporaries;
4144 assert(ExprTemporaries.size() >= FirstTemporary);
4145 assert(ExprNeedsCleanups || ExprTemporaries.size() == FirstTemporary);
4146 if (!ExprNeedsCleanups)
4149 Expr *E = ExprWithCleanups::Create(Context, SubExpr,
4150 ExprTemporaries.begin() + FirstTemporary,
4151 ExprTemporaries.size() - FirstTemporary);
4152 ExprTemporaries.erase(ExprTemporaries.begin() + FirstTemporary,
4153 ExprTemporaries.end());
4154 ExprNeedsCleanups = false;
4160 Sema::MaybeCreateExprWithCleanups(ExprResult SubExpr) {
4161 if (SubExpr.isInvalid())
4164 return Owned(MaybeCreateExprWithCleanups(SubExpr.take()));
4167 Stmt *Sema::MaybeCreateStmtWithCleanups(Stmt *SubStmt) {
4168 assert(SubStmt && "sub statement can't be null!");
4170 if (!ExprNeedsCleanups)
4173 // FIXME: In order to attach the temporaries, wrap the statement into
4174 // a StmtExpr; currently this is only used for asm statements.
4175 // This is hacky, either create a new CXXStmtWithTemporaries statement or
4176 // a new AsmStmtWithTemporaries.
4177 CompoundStmt *CompStmt = new (Context) CompoundStmt(Context, &SubStmt, 1,
4180 Expr *E = new (Context) StmtExpr(CompStmt, Context.VoidTy, SourceLocation(),
4182 return MaybeCreateExprWithCleanups(E);
4186 Sema::ActOnStartCXXMemberReference(Scope *S, Expr *Base, SourceLocation OpLoc,
4187 tok::TokenKind OpKind, ParsedType &ObjectType,
4188 bool &MayBePseudoDestructor) {
4189 // Since this might be a postfix expression, get rid of ParenListExprs.
4190 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
4191 if (Result.isInvalid()) return ExprError();
4192 Base = Result.get();
4194 QualType BaseType = Base->getType();
4195 MayBePseudoDestructor = false;
4196 if (BaseType->isDependentType()) {
4197 // If we have a pointer to a dependent type and are using the -> operator,
4198 // the object type is the type that the pointer points to. We might still
4199 // have enough information about that type to do something useful.
4200 if (OpKind == tok::arrow)
4201 if (const PointerType *Ptr = BaseType->getAs<PointerType>())
4202 BaseType = Ptr->getPointeeType();
4204 ObjectType = ParsedType::make(BaseType);
4205 MayBePseudoDestructor = true;
4209 // C++ [over.match.oper]p8:
4210 // [...] When operator->returns, the operator-> is applied to the value
4211 // returned, with the original second operand.
4212 if (OpKind == tok::arrow) {
4213 // The set of types we've considered so far.
4214 llvm::SmallPtrSet<CanQualType,8> CTypes;
4215 SmallVector<SourceLocation, 8> Locations;
4216 CTypes.insert(Context.getCanonicalType(BaseType));
4218 while (BaseType->isRecordType()) {
4219 Result = BuildOverloadedArrowExpr(S, Base, OpLoc);
4220 if (Result.isInvalid())
4222 Base = Result.get();
4223 if (CXXOperatorCallExpr *OpCall = dyn_cast<CXXOperatorCallExpr>(Base))
4224 Locations.push_back(OpCall->getDirectCallee()->getLocation());
4225 BaseType = Base->getType();
4226 CanQualType CBaseType = Context.getCanonicalType(BaseType);
4227 if (!CTypes.insert(CBaseType)) {
4228 Diag(OpLoc, diag::err_operator_arrow_circular);
4229 for (unsigned i = 0; i < Locations.size(); i++)
4230 Diag(Locations[i], diag::note_declared_at);
4235 if (BaseType->isPointerType())
4236 BaseType = BaseType->getPointeeType();
4239 // We could end up with various non-record types here, such as extended
4240 // vector types or Objective-C interfaces. Just return early and let
4241 // ActOnMemberReferenceExpr do the work.
4242 if (!BaseType->isRecordType()) {
4243 // C++ [basic.lookup.classref]p2:
4244 // [...] If the type of the object expression is of pointer to scalar
4245 // type, the unqualified-id is looked up in the context of the complete
4246 // postfix-expression.
4248 // This also indicates that we should be parsing a
4249 // pseudo-destructor-name.
4250 ObjectType = ParsedType();
4251 MayBePseudoDestructor = true;
4255 // The object type must be complete (or dependent).
4256 if (!BaseType->isDependentType() &&
4257 RequireCompleteType(OpLoc, BaseType,
4258 PDiag(diag::err_incomplete_member_access)))
4261 // C++ [basic.lookup.classref]p2:
4262 // If the id-expression in a class member access (5.2.5) is an
4263 // unqualified-id, and the type of the object expression is of a class
4264 // type C (or of pointer to a class type C), the unqualified-id is looked
4265 // up in the scope of class C. [...]
4266 ObjectType = ParsedType::make(BaseType);
4270 ExprResult Sema::DiagnoseDtorReference(SourceLocation NameLoc,
4272 SourceLocation ExpectedLParenLoc = PP.getLocForEndOfToken(NameLoc);
4273 Diag(MemExpr->getLocStart(), diag::err_dtor_expr_without_call)
4274 << isa<CXXPseudoDestructorExpr>(MemExpr)
4275 << FixItHint::CreateInsertion(ExpectedLParenLoc, "()");
4277 return ActOnCallExpr(/*Scope*/ 0,
4279 /*LPLoc*/ ExpectedLParenLoc,
4281 /*RPLoc*/ ExpectedLParenLoc);
4284 ExprResult Sema::BuildPseudoDestructorExpr(Expr *Base,
4285 SourceLocation OpLoc,
4286 tok::TokenKind OpKind,
4287 const CXXScopeSpec &SS,
4288 TypeSourceInfo *ScopeTypeInfo,
4289 SourceLocation CCLoc,
4290 SourceLocation TildeLoc,
4291 PseudoDestructorTypeStorage Destructed,
4292 bool HasTrailingLParen) {
4293 TypeSourceInfo *DestructedTypeInfo = Destructed.getTypeSourceInfo();
4295 // C++ [expr.pseudo]p2:
4296 // The left-hand side of the dot operator shall be of scalar type. The
4297 // left-hand side of the arrow operator shall be of pointer to scalar type.
4298 // This scalar type is the object type.
4299 QualType ObjectType = Base->getType();
4300 if (OpKind == tok::arrow) {
4301 if (const PointerType *Ptr = ObjectType->getAs<PointerType>()) {
4302 ObjectType = Ptr->getPointeeType();
4303 } else if (!Base->isTypeDependent()) {
4304 // The user wrote "p->" when she probably meant "p."; fix it.
4305 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
4306 << ObjectType << true
4307 << FixItHint::CreateReplacement(OpLoc, ".");
4308 if (isSFINAEContext())
4311 OpKind = tok::period;
4315 if (!ObjectType->isDependentType() && !ObjectType->isScalarType()) {
4316 Diag(OpLoc, diag::err_pseudo_dtor_base_not_scalar)
4317 << ObjectType << Base->getSourceRange();
4321 // C++ [expr.pseudo]p2:
4322 // [...] The cv-unqualified versions of the object type and of the type
4323 // designated by the pseudo-destructor-name shall be the same type.
4324 if (DestructedTypeInfo) {
4325 QualType DestructedType = DestructedTypeInfo->getType();
4326 SourceLocation DestructedTypeStart
4327 = DestructedTypeInfo->getTypeLoc().getLocalSourceRange().getBegin();
4328 if (!DestructedType->isDependentType() && !ObjectType->isDependentType()) {
4329 if (!Context.hasSameUnqualifiedType(DestructedType, ObjectType)) {
4330 Diag(DestructedTypeStart, diag::err_pseudo_dtor_type_mismatch)
4331 << ObjectType << DestructedType << Base->getSourceRange()
4332 << DestructedTypeInfo->getTypeLoc().getLocalSourceRange();
4334 // Recover by setting the destructed type to the object type.
4335 DestructedType = ObjectType;
4336 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(ObjectType,
4337 DestructedTypeStart);
4338 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
4339 } else if (DestructedType.getObjCLifetime() !=
4340 ObjectType.getObjCLifetime()) {
4342 if (DestructedType.getObjCLifetime() == Qualifiers::OCL_None) {
4343 // Okay: just pretend that the user provided the correctly-qualified
4346 Diag(DestructedTypeStart, diag::err_arc_pseudo_dtor_inconstant_quals)
4347 << ObjectType << DestructedType << Base->getSourceRange()
4348 << DestructedTypeInfo->getTypeLoc().getLocalSourceRange();
4351 // Recover by setting the destructed type to the object type.
4352 DestructedType = ObjectType;
4353 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(ObjectType,
4354 DestructedTypeStart);
4355 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
4360 // C++ [expr.pseudo]p2:
4361 // [...] Furthermore, the two type-names in a pseudo-destructor-name of the
4364 // ::[opt] nested-name-specifier[opt] type-name :: ~ type-name
4366 // shall designate the same scalar type.
4367 if (ScopeTypeInfo) {
4368 QualType ScopeType = ScopeTypeInfo->getType();
4369 if (!ScopeType->isDependentType() && !ObjectType->isDependentType() &&
4370 !Context.hasSameUnqualifiedType(ScopeType, ObjectType)) {
4372 Diag(ScopeTypeInfo->getTypeLoc().getLocalSourceRange().getBegin(),
4373 diag::err_pseudo_dtor_type_mismatch)
4374 << ObjectType << ScopeType << Base->getSourceRange()
4375 << ScopeTypeInfo->getTypeLoc().getLocalSourceRange();
4377 ScopeType = QualType();
4383 = new (Context) CXXPseudoDestructorExpr(Context, Base,
4384 OpKind == tok::arrow, OpLoc,
4385 SS.getWithLocInContext(Context),
4391 if (HasTrailingLParen)
4392 return Owned(Result);
4394 return DiagnoseDtorReference(Destructed.getLocation(), Result);
4397 ExprResult Sema::ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
4398 SourceLocation OpLoc,
4399 tok::TokenKind OpKind,
4401 UnqualifiedId &FirstTypeName,
4402 SourceLocation CCLoc,
4403 SourceLocation TildeLoc,
4404 UnqualifiedId &SecondTypeName,
4405 bool HasTrailingLParen) {
4406 assert((FirstTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
4407 FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) &&
4408 "Invalid first type name in pseudo-destructor");
4409 assert((SecondTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
4410 SecondTypeName.getKind() == UnqualifiedId::IK_Identifier) &&
4411 "Invalid second type name in pseudo-destructor");
4413 // C++ [expr.pseudo]p2:
4414 // The left-hand side of the dot operator shall be of scalar type. The
4415 // left-hand side of the arrow operator shall be of pointer to scalar type.
4416 // This scalar type is the object type.
4417 QualType ObjectType = Base->getType();
4418 if (OpKind == tok::arrow) {
4419 if (const PointerType *Ptr = ObjectType->getAs<PointerType>()) {
4420 ObjectType = Ptr->getPointeeType();
4421 } else if (!ObjectType->isDependentType()) {
4422 // The user wrote "p->" when she probably meant "p."; fix it.
4423 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
4424 << ObjectType << true
4425 << FixItHint::CreateReplacement(OpLoc, ".");
4426 if (isSFINAEContext())
4429 OpKind = tok::period;
4433 // Compute the object type that we should use for name lookup purposes. Only
4434 // record types and dependent types matter.
4435 ParsedType ObjectTypePtrForLookup;
4437 if (ObjectType->isRecordType())
4438 ObjectTypePtrForLookup = ParsedType::make(ObjectType);
4439 else if (ObjectType->isDependentType())
4440 ObjectTypePtrForLookup = ParsedType::make(Context.DependentTy);
4443 // Convert the name of the type being destructed (following the ~) into a
4444 // type (with source-location information).
4445 QualType DestructedType;
4446 TypeSourceInfo *DestructedTypeInfo = 0;
4447 PseudoDestructorTypeStorage Destructed;
4448 if (SecondTypeName.getKind() == UnqualifiedId::IK_Identifier) {
4449 ParsedType T = getTypeName(*SecondTypeName.Identifier,
4450 SecondTypeName.StartLocation,
4451 S, &SS, true, false, ObjectTypePtrForLookup);
4453 ((SS.isSet() && !computeDeclContext(SS, false)) ||
4454 (!SS.isSet() && ObjectType->isDependentType()))) {
4455 // The name of the type being destroyed is a dependent name, and we
4456 // couldn't find anything useful in scope. Just store the identifier and
4457 // it's location, and we'll perform (qualified) name lookup again at
4458 // template instantiation time.
4459 Destructed = PseudoDestructorTypeStorage(SecondTypeName.Identifier,
4460 SecondTypeName.StartLocation);
4462 Diag(SecondTypeName.StartLocation,
4463 diag::err_pseudo_dtor_destructor_non_type)
4464 << SecondTypeName.Identifier << ObjectType;
4465 if (isSFINAEContext())
4468 // Recover by assuming we had the right type all along.
4469 DestructedType = ObjectType;
4471 DestructedType = GetTypeFromParser(T, &DestructedTypeInfo);
4473 // Resolve the template-id to a type.
4474 TemplateIdAnnotation *TemplateId = SecondTypeName.TemplateId;
4475 ASTTemplateArgsPtr TemplateArgsPtr(*this,
4476 TemplateId->getTemplateArgs(),
4477 TemplateId->NumArgs);
4478 TypeResult T = ActOnTemplateIdType(TemplateId->SS,
4479 TemplateId->Template,
4480 TemplateId->TemplateNameLoc,
4481 TemplateId->LAngleLoc,
4483 TemplateId->RAngleLoc);
4484 if (T.isInvalid() || !T.get()) {
4485 // Recover by assuming we had the right type all along.
4486 DestructedType = ObjectType;
4488 DestructedType = GetTypeFromParser(T.get(), &DestructedTypeInfo);
4491 // If we've performed some kind of recovery, (re-)build the type source
4493 if (!DestructedType.isNull()) {
4494 if (!DestructedTypeInfo)
4495 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(DestructedType,
4496 SecondTypeName.StartLocation);
4497 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
4500 // Convert the name of the scope type (the type prior to '::') into a type.
4501 TypeSourceInfo *ScopeTypeInfo = 0;
4503 if (FirstTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
4504 FirstTypeName.Identifier) {
4505 if (FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) {
4506 ParsedType T = getTypeName(*FirstTypeName.Identifier,
4507 FirstTypeName.StartLocation,
4508 S, &SS, true, false, ObjectTypePtrForLookup);
4510 Diag(FirstTypeName.StartLocation,
4511 diag::err_pseudo_dtor_destructor_non_type)
4512 << FirstTypeName.Identifier << ObjectType;
4514 if (isSFINAEContext())
4517 // Just drop this type. It's unnecessary anyway.
4518 ScopeType = QualType();
4520 ScopeType = GetTypeFromParser(T, &ScopeTypeInfo);
4522 // Resolve the template-id to a type.
4523 TemplateIdAnnotation *TemplateId = FirstTypeName.TemplateId;
4524 ASTTemplateArgsPtr TemplateArgsPtr(*this,
4525 TemplateId->getTemplateArgs(),
4526 TemplateId->NumArgs);
4527 TypeResult T = ActOnTemplateIdType(TemplateId->SS,
4528 TemplateId->Template,
4529 TemplateId->TemplateNameLoc,
4530 TemplateId->LAngleLoc,
4532 TemplateId->RAngleLoc);
4533 if (T.isInvalid() || !T.get()) {
4534 // Recover by dropping this type.
4535 ScopeType = QualType();
4537 ScopeType = GetTypeFromParser(T.get(), &ScopeTypeInfo);
4541 if (!ScopeType.isNull() && !ScopeTypeInfo)
4542 ScopeTypeInfo = Context.getTrivialTypeSourceInfo(ScopeType,
4543 FirstTypeName.StartLocation);
4546 return BuildPseudoDestructorExpr(Base, OpLoc, OpKind, SS,
4547 ScopeTypeInfo, CCLoc, TildeLoc,
4548 Destructed, HasTrailingLParen);
4551 ExprResult Sema::BuildCXXMemberCallExpr(Expr *E, NamedDecl *FoundDecl,
4552 CXXMethodDecl *Method,
4553 bool HadMultipleCandidates) {
4554 ExprResult Exp = PerformObjectArgumentInitialization(E, /*Qualifier=*/0,
4556 if (Exp.isInvalid())
4560 new (Context) MemberExpr(Exp.take(), /*IsArrow=*/false, Method,
4561 SourceLocation(), Method->getType(),
4562 VK_RValue, OK_Ordinary);
4563 if (HadMultipleCandidates)
4564 ME->setHadMultipleCandidates(true);
4566 QualType ResultType = Method->getResultType();
4567 ExprValueKind VK = Expr::getValueKindForType(ResultType);
4568 ResultType = ResultType.getNonLValueExprType(Context);
4570 MarkDeclarationReferenced(Exp.get()->getLocStart(), Method);
4571 CXXMemberCallExpr *CE =
4572 new (Context) CXXMemberCallExpr(Context, ME, 0, 0, ResultType, VK,
4573 Exp.get()->getLocEnd());
4577 ExprResult Sema::BuildCXXNoexceptExpr(SourceLocation KeyLoc, Expr *Operand,
4578 SourceLocation RParen) {
4579 return Owned(new (Context) CXXNoexceptExpr(Context.BoolTy, Operand,
4580 Operand->CanThrow(Context),
4584 ExprResult Sema::ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation,
4585 Expr *Operand, SourceLocation RParen) {
4586 return BuildCXXNoexceptExpr(KeyLoc, Operand, RParen);
4589 /// Perform the conversions required for an expression used in a
4590 /// context that ignores the result.
4591 ExprResult Sema::IgnoredValueConversions(Expr *E) {
4593 // [Except in specific positions,] an lvalue that does not have
4594 // array type is converted to the value stored in the
4595 // designated object (and is no longer an lvalue).
4596 if (E->isRValue()) {
4597 // In C, function designators (i.e. expressions of function type)
4598 // are r-values, but we still want to do function-to-pointer decay
4599 // on them. This is both technically correct and convenient for
4601 if (!getLangOptions().CPlusPlus && E->getType()->isFunctionType())
4602 return DefaultFunctionArrayConversion(E);
4607 // We always want to do this on ObjC property references.
4608 if (E->getObjectKind() == OK_ObjCProperty) {
4609 ExprResult Res = ConvertPropertyForRValue(E);
4610 if (Res.isInvalid()) return Owned(E);
4612 if (E->isRValue()) return Owned(E);
4615 // Otherwise, this rule does not apply in C++, at least not for the moment.
4616 if (getLangOptions().CPlusPlus) return Owned(E);
4618 // GCC seems to also exclude expressions of incomplete enum type.
4619 if (const EnumType *T = E->getType()->getAs<EnumType>()) {
4620 if (!T->getDecl()->isComplete()) {
4621 // FIXME: stupid workaround for a codegen bug!
4622 E = ImpCastExprToType(E, Context.VoidTy, CK_ToVoid).take();
4627 ExprResult Res = DefaultFunctionArrayLvalueConversion(E);
4628 if (Res.isInvalid())
4632 if (!E->getType()->isVoidType())
4633 RequireCompleteType(E->getExprLoc(), E->getType(),
4634 diag::err_incomplete_type);
4638 ExprResult Sema::ActOnFinishFullExpr(Expr *FE) {
4639 ExprResult FullExpr = Owned(FE);
4641 if (!FullExpr.get())
4644 if (DiagnoseUnexpandedParameterPack(FullExpr.get()))
4647 FullExpr = CheckPlaceholderExpr(FullExpr.take());
4648 if (FullExpr.isInvalid())
4651 FullExpr = IgnoredValueConversions(FullExpr.take());
4652 if (FullExpr.isInvalid())
4655 CheckImplicitConversions(FullExpr.get(), FullExpr.get()->getExprLoc());
4656 return MaybeCreateExprWithCleanups(FullExpr);
4659 StmtResult Sema::ActOnFinishFullStmt(Stmt *FullStmt) {
4660 if (!FullStmt) return StmtError();
4662 return MaybeCreateStmtWithCleanups(FullStmt);
4665 bool Sema::CheckMicrosoftIfExistsSymbol(CXXScopeSpec &SS,
4666 UnqualifiedId &Name) {
4667 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name);
4668 DeclarationName TargetName = TargetNameInfo.getName();
4672 // Do the redeclaration lookup in the current scope.
4673 LookupResult R(*this, TargetNameInfo, Sema::LookupAnyName,
4674 Sema::NotForRedeclaration);
4675 R.suppressDiagnostics();
4676 LookupParsedName(R, getCurScope(), &SS);