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 QualType T = E->getType();
299 if (const RecordType *RecordT = T->getAs<RecordType>()) {
300 CXXRecordDecl *RecordD = cast<CXXRecordDecl>(RecordT->getDecl());
301 // C++ [expr.typeid]p3:
302 // [...] If the type of the expression is a class type, the class
303 // shall be completely-defined.
304 if (RequireCompleteType(TypeidLoc, T, diag::err_incomplete_typeid))
307 // C++ [expr.typeid]p3:
308 // When typeid is applied to an expression other than an glvalue of a
309 // polymorphic class type [...] [the] expression is an unevaluated
311 if (RecordD->isPolymorphic() && E->Classify(Context).isGLValue()) {
312 isUnevaluatedOperand = false;
314 // We require a vtable to query the type at run time.
315 MarkVTableUsed(TypeidLoc, RecordD);
319 // C++ [expr.typeid]p4:
320 // [...] If the type of the type-id is a reference to a possibly
321 // cv-qualified type, the result of the typeid expression refers to a
322 // std::type_info object representing the cv-unqualified referenced
325 QualType UnqualT = Context.getUnqualifiedArrayType(T, Quals);
326 if (!Context.hasSameType(T, UnqualT)) {
328 E = ImpCastExprToType(E, UnqualT, CK_NoOp, CastCategory(E)).take();
332 // If this is an unevaluated operand, clear out the set of
333 // declaration references we have been computing and eliminate any
334 // temporaries introduced in its computation.
335 if (isUnevaluatedOperand)
336 ExprEvalContexts.back().Context = Unevaluated;
338 return Owned(new (Context) CXXTypeidExpr(TypeInfoType.withConst(),
340 SourceRange(TypeidLoc, RParenLoc)));
343 /// ActOnCXXTypeidOfType - Parse typeid( type-id ) or typeid (expression);
345 Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc,
346 bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
347 // Find the std::type_info type.
348 if (!getStdNamespace())
349 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
351 if (!CXXTypeInfoDecl) {
352 IdentifierInfo *TypeInfoII = &PP.getIdentifierTable().get("type_info");
353 LookupResult R(*this, TypeInfoII, SourceLocation(), LookupTagName);
354 LookupQualifiedName(R, getStdNamespace());
355 CXXTypeInfoDecl = R.getAsSingle<RecordDecl>();
356 if (!CXXTypeInfoDecl)
357 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
360 QualType TypeInfoType = Context.getTypeDeclType(CXXTypeInfoDecl);
363 // The operand is a type; handle it as such.
364 TypeSourceInfo *TInfo = 0;
365 QualType T = GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrExpr),
371 TInfo = Context.getTrivialTypeSourceInfo(T, OpLoc);
373 return BuildCXXTypeId(TypeInfoType, OpLoc, TInfo, RParenLoc);
376 // The operand is an expression.
377 return BuildCXXTypeId(TypeInfoType, OpLoc, (Expr*)TyOrExpr, RParenLoc);
380 /// Retrieve the UuidAttr associated with QT.
381 static UuidAttr *GetUuidAttrOfType(QualType QT) {
382 // Optionally remove one level of pointer, reference or array indirection.
383 const Type *Ty = QT.getTypePtr();;
384 if (QT->isPointerType() || QT->isReferenceType())
385 Ty = QT->getPointeeType().getTypePtr();
386 else if (QT->isArrayType())
387 Ty = cast<ArrayType>(QT)->getElementType().getTypePtr();
389 // Loop all record redeclaration looking for an uuid attribute.
390 CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
391 for (CXXRecordDecl::redecl_iterator I = RD->redecls_begin(),
392 E = RD->redecls_end(); I != E; ++I) {
393 if (UuidAttr *Uuid = I->getAttr<UuidAttr>())
400 /// \brief Build a Microsoft __uuidof expression with a type operand.
401 ExprResult Sema::BuildCXXUuidof(QualType TypeInfoType,
402 SourceLocation TypeidLoc,
403 TypeSourceInfo *Operand,
404 SourceLocation RParenLoc) {
405 if (!Operand->getType()->isDependentType()) {
406 if (!GetUuidAttrOfType(Operand->getType()))
407 return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid));
410 // FIXME: add __uuidof semantic analysis for type operand.
411 return Owned(new (Context) CXXUuidofExpr(TypeInfoType.withConst(),
413 SourceRange(TypeidLoc, RParenLoc)));
416 /// \brief Build a Microsoft __uuidof expression with an expression operand.
417 ExprResult Sema::BuildCXXUuidof(QualType TypeInfoType,
418 SourceLocation TypeidLoc,
420 SourceLocation RParenLoc) {
421 if (!E->getType()->isDependentType()) {
422 if (!GetUuidAttrOfType(E->getType()) &&
423 !E->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull))
424 return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid));
426 // FIXME: add __uuidof semantic analysis for type operand.
427 return Owned(new (Context) CXXUuidofExpr(TypeInfoType.withConst(),
429 SourceRange(TypeidLoc, RParenLoc)));
432 /// ActOnCXXUuidof - Parse __uuidof( type-id ) or __uuidof (expression);
434 Sema::ActOnCXXUuidof(SourceLocation OpLoc, SourceLocation LParenLoc,
435 bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
436 // If MSVCGuidDecl has not been cached, do the lookup.
438 IdentifierInfo *GuidII = &PP.getIdentifierTable().get("_GUID");
439 LookupResult R(*this, GuidII, SourceLocation(), LookupTagName);
440 LookupQualifiedName(R, Context.getTranslationUnitDecl());
441 MSVCGuidDecl = R.getAsSingle<RecordDecl>();
443 return ExprError(Diag(OpLoc, diag::err_need_header_before_ms_uuidof));
446 QualType GuidType = Context.getTypeDeclType(MSVCGuidDecl);
449 // The operand is a type; handle it as such.
450 TypeSourceInfo *TInfo = 0;
451 QualType T = GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrExpr),
457 TInfo = Context.getTrivialTypeSourceInfo(T, OpLoc);
459 return BuildCXXUuidof(GuidType, OpLoc, TInfo, RParenLoc);
462 // The operand is an expression.
463 return BuildCXXUuidof(GuidType, OpLoc, (Expr*)TyOrExpr, RParenLoc);
466 /// ActOnCXXBoolLiteral - Parse {true,false} literals.
468 Sema::ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
469 assert((Kind == tok::kw_true || Kind == tok::kw_false) &&
470 "Unknown C++ Boolean value!");
471 return Owned(new (Context) CXXBoolLiteralExpr(Kind == tok::kw_true,
472 Context.BoolTy, OpLoc));
475 /// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
477 Sema::ActOnCXXNullPtrLiteral(SourceLocation Loc) {
478 return Owned(new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc));
481 /// ActOnCXXThrow - Parse throw expressions.
483 Sema::ActOnCXXThrow(SourceLocation OpLoc, Expr *Ex) {
484 // Don't report an error if 'throw' is used in system headers.
485 if (!getLangOptions().CXXExceptions &&
486 !getSourceManager().isInSystemHeader(OpLoc))
487 Diag(OpLoc, diag::err_exceptions_disabled) << "throw";
489 if (Ex && !Ex->isTypeDependent()) {
490 ExprResult ExRes = CheckCXXThrowOperand(OpLoc, Ex);
491 if (ExRes.isInvalid())
495 return Owned(new (Context) CXXThrowExpr(Ex, Context.VoidTy, OpLoc));
498 /// CheckCXXThrowOperand - Validate the operand of a throw.
499 ExprResult Sema::CheckCXXThrowOperand(SourceLocation ThrowLoc, Expr *E) {
500 // C++ [except.throw]p3:
501 // A throw-expression initializes a temporary object, called the exception
502 // object, the type of which is determined by removing any top-level
503 // cv-qualifiers from the static type of the operand of throw and adjusting
504 // the type from "array of T" or "function returning T" to "pointer to T"
505 // or "pointer to function returning T", [...]
506 if (E->getType().hasQualifiers())
507 E = ImpCastExprToType(E, E->getType().getUnqualifiedType(), CK_NoOp,
508 CastCategory(E)).take();
510 ExprResult Res = DefaultFunctionArrayConversion(E);
515 // If the type of the exception would be an incomplete type or a pointer
516 // to an incomplete type other than (cv) void the program is ill-formed.
517 QualType Ty = E->getType();
518 bool isPointer = false;
519 if (const PointerType* Ptr = Ty->getAs<PointerType>()) {
520 Ty = Ptr->getPointeeType();
523 if (!isPointer || !Ty->isVoidType()) {
524 if (RequireCompleteType(ThrowLoc, Ty,
525 PDiag(isPointer ? diag::err_throw_incomplete_ptr
526 : diag::err_throw_incomplete)
527 << E->getSourceRange()))
530 if (RequireNonAbstractType(ThrowLoc, E->getType(),
531 PDiag(diag::err_throw_abstract_type)
532 << E->getSourceRange()))
536 // Initialize the exception result. This implicitly weeds out
537 // abstract types or types with inaccessible copy constructors.
538 const VarDecl *NRVOVariable = getCopyElisionCandidate(QualType(), E, false);
540 // FIXME: Determine whether we can elide this copy per C++0x [class.copy]p32.
541 InitializedEntity Entity =
542 InitializedEntity::InitializeException(ThrowLoc, E->getType(),
544 Res = PerformMoveOrCopyInitialization(Entity, NRVOVariable,
550 // If the exception has class type, we need additional handling.
551 const RecordType *RecordTy = Ty->getAs<RecordType>();
554 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl());
556 // If we are throwing a polymorphic class type or pointer thereof,
557 // exception handling will make use of the vtable.
558 MarkVTableUsed(ThrowLoc, RD);
560 // If a pointer is thrown, the referenced object will not be destroyed.
564 // If the class has a non-trivial destructor, we must be able to call it.
565 if (RD->hasTrivialDestructor())
568 CXXDestructorDecl *Destructor
569 = const_cast<CXXDestructorDecl*>(LookupDestructor(RD));
573 MarkDeclarationReferenced(E->getExprLoc(), Destructor);
574 CheckDestructorAccess(E->getExprLoc(), Destructor,
575 PDiag(diag::err_access_dtor_exception) << Ty);
579 QualType Sema::getAndCaptureCurrentThisType() {
580 // Ignore block scopes: we can capture through them.
581 // Ignore nested enum scopes: we'll diagnose non-constant expressions
582 // where they're invalid, and other uses are legitimate.
583 // Don't ignore nested class scopes: you can't use 'this' in a local class.
584 DeclContext *DC = CurContext;
585 unsigned NumBlocks = 0;
587 if (isa<BlockDecl>(DC)) {
588 DC = cast<BlockDecl>(DC)->getDeclContext();
590 } else if (isa<EnumDecl>(DC))
591 DC = cast<EnumDecl>(DC)->getDeclContext();
596 if (CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(DC)) {
597 if (method && method->isInstance())
598 ThisTy = method->getThisType(Context);
599 } else if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) {
600 // C++0x [expr.prim]p4:
601 // Otherwise, if a member-declarator declares a non-static data member
602 // of a class X, the expression this is a prvalue of type "pointer to X"
603 // within the optional brace-or-equal-initializer.
604 Scope *S = getScopeForContext(DC);
605 if (!S || S->getFlags() & Scope::ThisScope)
606 ThisTy = Context.getPointerType(Context.getRecordType(RD));
609 // Mark that we're closing on 'this' in all the block scopes we ignored.
610 if (!ThisTy.isNull())
611 for (unsigned idx = FunctionScopes.size() - 1;
612 NumBlocks; --idx, --NumBlocks)
613 cast<BlockScopeInfo>(FunctionScopes[idx])->CapturesCXXThis = true;
618 ExprResult Sema::ActOnCXXThis(SourceLocation Loc) {
619 /// C++ 9.3.2: In the body of a non-static member function, the keyword this
620 /// is a non-lvalue expression whose value is the address of the object for
621 /// which the function is called.
623 QualType ThisTy = getAndCaptureCurrentThisType();
624 if (ThisTy.isNull()) return Diag(Loc, diag::err_invalid_this_use);
626 return Owned(new (Context) CXXThisExpr(Loc, ThisTy, /*isImplicit=*/false));
630 Sema::ActOnCXXTypeConstructExpr(ParsedType TypeRep,
631 SourceLocation LParenLoc,
633 SourceLocation RParenLoc) {
637 TypeSourceInfo *TInfo;
638 QualType Ty = GetTypeFromParser(TypeRep, &TInfo);
640 TInfo = Context.getTrivialTypeSourceInfo(Ty, SourceLocation());
642 return BuildCXXTypeConstructExpr(TInfo, LParenLoc, exprs, RParenLoc);
645 /// ActOnCXXTypeConstructExpr - Parse construction of a specified type.
646 /// Can be interpreted either as function-style casting ("int(x)")
647 /// or class type construction ("ClassType(x,y,z)")
648 /// or creation of a value-initialized type ("int()").
650 Sema::BuildCXXTypeConstructExpr(TypeSourceInfo *TInfo,
651 SourceLocation LParenLoc,
653 SourceLocation RParenLoc) {
654 QualType Ty = TInfo->getType();
655 unsigned NumExprs = exprs.size();
656 Expr **Exprs = (Expr**)exprs.get();
657 SourceLocation TyBeginLoc = TInfo->getTypeLoc().getBeginLoc();
658 SourceRange FullRange = SourceRange(TyBeginLoc, RParenLoc);
660 if (Ty->isDependentType() ||
661 CallExpr::hasAnyTypeDependentArguments(Exprs, NumExprs)) {
664 return Owned(CXXUnresolvedConstructExpr::Create(Context, TInfo,
670 if (Ty->isArrayType())
671 return ExprError(Diag(TyBeginLoc,
672 diag::err_value_init_for_array_type) << FullRange);
673 if (!Ty->isVoidType() &&
674 RequireCompleteType(TyBeginLoc, Ty,
675 PDiag(diag::err_invalid_incomplete_type_use)
679 if (RequireNonAbstractType(TyBeginLoc, Ty,
680 diag::err_allocation_of_abstract_type))
684 // C++ [expr.type.conv]p1:
685 // If the expression list is a single expression, the type conversion
686 // expression is equivalent (in definedness, and if defined in meaning) to the
687 // corresponding cast expression.
690 CastKind Kind = CK_Invalid;
691 ExprValueKind VK = VK_RValue;
692 CXXCastPath BasePath;
693 ExprResult CastExpr =
694 CheckCastTypes(TInfo->getTypeLoc().getSourceRange(), Ty, Exprs[0],
696 /*FunctionalStyle=*/true);
697 if (CastExpr.isInvalid())
699 Exprs[0] = CastExpr.take();
703 return Owned(CXXFunctionalCastExpr::Create(Context,
704 Ty.getNonLValueExprType(Context),
705 VK, TInfo, TyBeginLoc, Kind,
710 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TInfo);
711 InitializationKind Kind
712 = NumExprs ? InitializationKind::CreateDirect(TyBeginLoc,
713 LParenLoc, RParenLoc)
714 : InitializationKind::CreateValue(TyBeginLoc,
715 LParenLoc, RParenLoc);
716 InitializationSequence InitSeq(*this, Entity, Kind, Exprs, NumExprs);
717 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(exprs));
719 // FIXME: Improve AST representation?
723 /// doesUsualArrayDeleteWantSize - Answers whether the usual
724 /// operator delete[] for the given type has a size_t parameter.
725 static bool doesUsualArrayDeleteWantSize(Sema &S, SourceLocation loc,
726 QualType allocType) {
727 const RecordType *record =
728 allocType->getBaseElementTypeUnsafe()->getAs<RecordType>();
729 if (!record) return false;
731 // Try to find an operator delete[] in class scope.
733 DeclarationName deleteName =
734 S.Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete);
735 LookupResult ops(S, deleteName, loc, Sema::LookupOrdinaryName);
736 S.LookupQualifiedName(ops, record->getDecl());
738 // We're just doing this for information.
739 ops.suppressDiagnostics();
741 // Very likely: there's no operator delete[].
742 if (ops.empty()) return false;
744 // If it's ambiguous, it should be illegal to call operator delete[]
745 // on this thing, so it doesn't matter if we allocate extra space or not.
746 if (ops.isAmbiguous()) return false;
748 LookupResult::Filter filter = ops.makeFilter();
749 while (filter.hasNext()) {
750 NamedDecl *del = filter.next()->getUnderlyingDecl();
752 // C++0x [basic.stc.dynamic.deallocation]p2:
753 // A template instance is never a usual deallocation function,
754 // regardless of its signature.
755 if (isa<FunctionTemplateDecl>(del)) {
760 // C++0x [basic.stc.dynamic.deallocation]p2:
761 // If class T does not declare [an operator delete[] with one
762 // parameter] but does declare a member deallocation function
763 // named operator delete[] with exactly two parameters, the
764 // second of which has type std::size_t, then this function
765 // is a usual deallocation function.
766 if (!cast<CXXMethodDecl>(del)->isUsualDeallocationFunction()) {
773 if (!ops.isSingleResult()) return false;
775 const FunctionDecl *del = cast<FunctionDecl>(ops.getFoundDecl());
776 return (del->getNumParams() == 2);
779 /// ActOnCXXNew - Parsed a C++ 'new' expression (C++ 5.3.4), as in e.g.:
780 /// @code new (memory) int[size][4] @endcode
782 /// @code ::new Foo(23, "hello") @endcode
783 /// For the interpretation of this heap of arguments, consult the base version.
785 Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
786 SourceLocation PlacementLParen, MultiExprArg PlacementArgs,
787 SourceLocation PlacementRParen, SourceRange TypeIdParens,
788 Declarator &D, SourceLocation ConstructorLParen,
789 MultiExprArg ConstructorArgs,
790 SourceLocation ConstructorRParen) {
791 bool TypeContainsAuto = D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto;
794 // If the specified type is an array, unwrap it and save the expression.
795 if (D.getNumTypeObjects() > 0 &&
796 D.getTypeObject(0).Kind == DeclaratorChunk::Array) {
797 DeclaratorChunk &Chunk = D.getTypeObject(0);
798 if (TypeContainsAuto)
799 return ExprError(Diag(Chunk.Loc, diag::err_new_array_of_auto)
800 << D.getSourceRange());
801 if (Chunk.Arr.hasStatic)
802 return ExprError(Diag(Chunk.Loc, diag::err_static_illegal_in_new)
803 << D.getSourceRange());
804 if (!Chunk.Arr.NumElts)
805 return ExprError(Diag(Chunk.Loc, diag::err_array_new_needs_size)
806 << D.getSourceRange());
808 ArraySize = static_cast<Expr*>(Chunk.Arr.NumElts);
809 D.DropFirstTypeObject();
812 // Every dimension shall be of constant size.
814 for (unsigned I = 0, N = D.getNumTypeObjects(); I < N; ++I) {
815 if (D.getTypeObject(I).Kind != DeclaratorChunk::Array)
818 DeclaratorChunk::ArrayTypeInfo &Array = D.getTypeObject(I).Arr;
819 if (Expr *NumElts = (Expr *)Array.NumElts) {
820 if (!NumElts->isTypeDependent() && !NumElts->isValueDependent() &&
821 !NumElts->isIntegerConstantExpr(Context)) {
822 Diag(D.getTypeObject(I).Loc, diag::err_new_array_nonconst)
823 << NumElts->getSourceRange();
830 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, /*Scope=*/0, /*OwnedDecl=*/0,
832 QualType AllocType = TInfo->getType();
833 if (D.isInvalidType())
836 return BuildCXXNew(StartLoc, UseGlobal,
845 move(ConstructorArgs),
851 Sema::BuildCXXNew(SourceLocation StartLoc, bool UseGlobal,
852 SourceLocation PlacementLParen,
853 MultiExprArg PlacementArgs,
854 SourceLocation PlacementRParen,
855 SourceRange TypeIdParens,
857 TypeSourceInfo *AllocTypeInfo,
859 SourceLocation ConstructorLParen,
860 MultiExprArg ConstructorArgs,
861 SourceLocation ConstructorRParen,
862 bool TypeMayContainAuto) {
863 SourceRange TypeRange = AllocTypeInfo->getTypeLoc().getSourceRange();
865 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for.
866 if (TypeMayContainAuto && AllocType->getContainedAutoType()) {
867 if (ConstructorArgs.size() == 0)
868 return ExprError(Diag(StartLoc, diag::err_auto_new_requires_ctor_arg)
869 << AllocType << TypeRange);
870 if (ConstructorArgs.size() != 1) {
871 Expr *FirstBad = ConstructorArgs.get()[1];
872 return ExprError(Diag(FirstBad->getSourceRange().getBegin(),
873 diag::err_auto_new_ctor_multiple_expressions)
874 << AllocType << TypeRange);
876 TypeSourceInfo *DeducedType = 0;
877 if (!DeduceAutoType(AllocTypeInfo, ConstructorArgs.get()[0], DeducedType))
878 return ExprError(Diag(StartLoc, diag::err_auto_new_deduction_failure)
880 << ConstructorArgs.get()[0]->getType()
882 << ConstructorArgs.get()[0]->getSourceRange());
886 AllocTypeInfo = DeducedType;
887 AllocType = AllocTypeInfo->getType();
890 // Per C++0x [expr.new]p5, the type being constructed may be a
891 // typedef of an array type.
893 if (const ConstantArrayType *Array
894 = Context.getAsConstantArrayType(AllocType)) {
895 ArraySize = IntegerLiteral::Create(Context, Array->getSize(),
896 Context.getSizeType(),
898 AllocType = Array->getElementType();
902 if (CheckAllocatedType(AllocType, TypeRange.getBegin(), TypeRange))
905 QualType ResultType = Context.getPointerType(AllocType);
907 // C++ 5.3.4p6: "The expression in a direct-new-declarator shall have integral
908 // or enumeration type with a non-negative value."
909 if (ArraySize && !ArraySize->isTypeDependent()) {
911 QualType SizeType = ArraySize->getType();
913 ExprResult ConvertedSize
914 = ConvertToIntegralOrEnumerationType(StartLoc, ArraySize,
915 PDiag(diag::err_array_size_not_integral),
916 PDiag(diag::err_array_size_incomplete_type)
917 << ArraySize->getSourceRange(),
918 PDiag(diag::err_array_size_explicit_conversion),
919 PDiag(diag::note_array_size_conversion),
920 PDiag(diag::err_array_size_ambiguous_conversion),
921 PDiag(diag::note_array_size_conversion),
922 PDiag(getLangOptions().CPlusPlus0x? 0
923 : diag::ext_array_size_conversion));
924 if (ConvertedSize.isInvalid())
927 ArraySize = ConvertedSize.take();
928 SizeType = ArraySize->getType();
929 if (!SizeType->isIntegralOrUnscopedEnumerationType())
932 // Let's see if this is a constant < 0. If so, we reject it out of hand.
933 // We don't care about special rules, so we tell the machinery it's not
934 // evaluated - it gives us a result in more cases.
935 if (!ArraySize->isValueDependent()) {
937 if (ArraySize->isIntegerConstantExpr(Value, Context, 0, false)) {
938 if (Value < llvm::APSInt(
939 llvm::APInt::getNullValue(Value.getBitWidth()),
941 return ExprError(Diag(ArraySize->getSourceRange().getBegin(),
942 diag::err_typecheck_negative_array_size)
943 << ArraySize->getSourceRange());
945 if (!AllocType->isDependentType()) {
946 unsigned ActiveSizeBits
947 = ConstantArrayType::getNumAddressingBits(Context, AllocType, Value);
948 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
949 Diag(ArraySize->getSourceRange().getBegin(),
950 diag::err_array_too_large)
951 << Value.toString(10)
952 << ArraySize->getSourceRange();
956 } else if (TypeIdParens.isValid()) {
957 // Can't have dynamic array size when the type-id is in parentheses.
958 Diag(ArraySize->getLocStart(), diag::ext_new_paren_array_nonconst)
959 << ArraySize->getSourceRange()
960 << FixItHint::CreateRemoval(TypeIdParens.getBegin())
961 << FixItHint::CreateRemoval(TypeIdParens.getEnd());
963 TypeIdParens = SourceRange();
967 // Note that we do *not* convert the argument in any way. It can
968 // be signed, larger than size_t, whatever.
971 FunctionDecl *OperatorNew = 0;
972 FunctionDecl *OperatorDelete = 0;
973 Expr **PlaceArgs = (Expr**)PlacementArgs.get();
974 unsigned NumPlaceArgs = PlacementArgs.size();
976 if (!AllocType->isDependentType() &&
977 !Expr::hasAnyTypeDependentArguments(PlaceArgs, NumPlaceArgs) &&
978 FindAllocationFunctions(StartLoc,
979 SourceRange(PlacementLParen, PlacementRParen),
980 UseGlobal, AllocType, ArraySize, PlaceArgs,
981 NumPlaceArgs, OperatorNew, OperatorDelete))
984 // If this is an array allocation, compute whether the usual array
985 // deallocation function for the type has a size_t parameter.
986 bool UsualArrayDeleteWantsSize = false;
987 if (ArraySize && !AllocType->isDependentType())
988 UsualArrayDeleteWantsSize
989 = doesUsualArrayDeleteWantSize(*this, StartLoc, AllocType);
991 llvm::SmallVector<Expr *, 8> AllPlaceArgs;
993 // Add default arguments, if any.
994 const FunctionProtoType *Proto =
995 OperatorNew->getType()->getAs<FunctionProtoType>();
996 VariadicCallType CallType =
997 Proto->isVariadic() ? VariadicFunction : VariadicDoesNotApply;
999 if (GatherArgumentsForCall(PlacementLParen, OperatorNew,
1000 Proto, 1, PlaceArgs, NumPlaceArgs,
1001 AllPlaceArgs, CallType))
1004 NumPlaceArgs = AllPlaceArgs.size();
1005 if (NumPlaceArgs > 0)
1006 PlaceArgs = &AllPlaceArgs[0];
1009 bool Init = ConstructorLParen.isValid();
1010 // --- Choosing a constructor ---
1011 CXXConstructorDecl *Constructor = 0;
1012 Expr **ConsArgs = (Expr**)ConstructorArgs.get();
1013 unsigned NumConsArgs = ConstructorArgs.size();
1014 ASTOwningVector<Expr*> ConvertedConstructorArgs(*this);
1016 // Array 'new' can't have any initializers.
1017 if (NumConsArgs && (ResultType->isArrayType() || ArraySize)) {
1018 SourceRange InitRange(ConsArgs[0]->getLocStart(),
1019 ConsArgs[NumConsArgs - 1]->getLocEnd());
1021 Diag(StartLoc, diag::err_new_array_init_args) << InitRange;
1025 if (!AllocType->isDependentType() &&
1026 !Expr::hasAnyTypeDependentArguments(ConsArgs, NumConsArgs)) {
1027 // C++0x [expr.new]p15:
1028 // A new-expression that creates an object of type T initializes that
1029 // object as follows:
1030 InitializationKind Kind
1031 // - If the new-initializer is omitted, the object is default-
1032 // initialized (8.5); if no initialization is performed,
1033 // the object has indeterminate value
1034 = !Init? InitializationKind::CreateDefault(TypeRange.getBegin())
1035 // - Otherwise, the new-initializer is interpreted according to the
1036 // initialization rules of 8.5 for direct-initialization.
1037 : InitializationKind::CreateDirect(TypeRange.getBegin(),
1041 InitializedEntity Entity
1042 = InitializedEntity::InitializeNew(StartLoc, AllocType);
1043 InitializationSequence InitSeq(*this, Entity, Kind, ConsArgs, NumConsArgs);
1044 ExprResult FullInit = InitSeq.Perform(*this, Entity, Kind,
1045 move(ConstructorArgs));
1046 if (FullInit.isInvalid())
1049 // FullInit is our initializer; walk through it to determine if it's a
1050 // constructor call, which CXXNewExpr handles directly.
1051 if (Expr *FullInitExpr = (Expr *)FullInit.get()) {
1052 if (CXXBindTemporaryExpr *Binder
1053 = dyn_cast<CXXBindTemporaryExpr>(FullInitExpr))
1054 FullInitExpr = Binder->getSubExpr();
1055 if (CXXConstructExpr *Construct
1056 = dyn_cast<CXXConstructExpr>(FullInitExpr)) {
1057 Constructor = Construct->getConstructor();
1058 for (CXXConstructExpr::arg_iterator A = Construct->arg_begin(),
1059 AEnd = Construct->arg_end();
1061 ConvertedConstructorArgs.push_back(*A);
1063 // Take the converted initializer.
1064 ConvertedConstructorArgs.push_back(FullInit.release());
1067 // No initialization required.
1070 // Take the converted arguments and use them for the new expression.
1071 NumConsArgs = ConvertedConstructorArgs.size();
1072 ConsArgs = (Expr **)ConvertedConstructorArgs.take();
1075 // Mark the new and delete operators as referenced.
1077 MarkDeclarationReferenced(StartLoc, OperatorNew);
1079 MarkDeclarationReferenced(StartLoc, OperatorDelete);
1081 // FIXME: Also check that the destructor is accessible. (C++ 5.3.4p16)
1083 PlacementArgs.release();
1084 ConstructorArgs.release();
1086 return Owned(new (Context) CXXNewExpr(Context, UseGlobal, OperatorNew,
1087 PlaceArgs, NumPlaceArgs, TypeIdParens,
1088 ArraySize, Constructor, Init,
1089 ConsArgs, NumConsArgs, OperatorDelete,
1090 UsualArrayDeleteWantsSize,
1091 ResultType, AllocTypeInfo,
1093 Init ? ConstructorRParen :
1095 ConstructorLParen, ConstructorRParen));
1098 /// CheckAllocatedType - Checks that a type is suitable as the allocated type
1099 /// in a new-expression.
1100 /// dimension off and stores the size expression in ArraySize.
1101 bool Sema::CheckAllocatedType(QualType AllocType, SourceLocation Loc,
1103 // C++ 5.3.4p1: "[The] type shall be a complete object type, but not an
1104 // abstract class type or array thereof.
1105 if (AllocType->isFunctionType())
1106 return Diag(Loc, diag::err_bad_new_type)
1107 << AllocType << 0 << R;
1108 else if (AllocType->isReferenceType())
1109 return Diag(Loc, diag::err_bad_new_type)
1110 << AllocType << 1 << R;
1111 else if (!AllocType->isDependentType() &&
1112 RequireCompleteType(Loc, AllocType,
1113 PDiag(diag::err_new_incomplete_type)
1116 else if (RequireNonAbstractType(Loc, AllocType,
1117 diag::err_allocation_of_abstract_type))
1119 else if (AllocType->isVariablyModifiedType())
1120 return Diag(Loc, diag::err_variably_modified_new_type)
1122 else if (unsigned AddressSpace = AllocType.getAddressSpace())
1123 return Diag(Loc, diag::err_address_space_qualified_new)
1124 << AllocType.getUnqualifiedType() << AddressSpace;
1129 /// \brief Determine whether the given function is a non-placement
1130 /// deallocation function.
1131 static bool isNonPlacementDeallocationFunction(FunctionDecl *FD) {
1132 if (FD->isInvalidDecl())
1135 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD))
1136 return Method->isUsualDeallocationFunction();
1138 return ((FD->getOverloadedOperator() == OO_Delete ||
1139 FD->getOverloadedOperator() == OO_Array_Delete) &&
1140 FD->getNumParams() == 1);
1143 /// FindAllocationFunctions - Finds the overloads of operator new and delete
1144 /// that are appropriate for the allocation.
1145 bool Sema::FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
1146 bool UseGlobal, QualType AllocType,
1147 bool IsArray, Expr **PlaceArgs,
1148 unsigned NumPlaceArgs,
1149 FunctionDecl *&OperatorNew,
1150 FunctionDecl *&OperatorDelete) {
1151 // --- Choosing an allocation function ---
1152 // C++ 5.3.4p8 - 14 & 18
1153 // 1) If UseGlobal is true, only look in the global scope. Else, also look
1154 // in the scope of the allocated class.
1155 // 2) If an array size is given, look for operator new[], else look for
1157 // 3) The first argument is always size_t. Append the arguments from the
1160 llvm::SmallVector<Expr*, 8> AllocArgs(1 + NumPlaceArgs);
1161 // We don't care about the actual value of this argument.
1162 // FIXME: Should the Sema create the expression and embed it in the syntax
1163 // tree? Or should the consumer just recalculate the value?
1164 IntegerLiteral Size(Context, llvm::APInt::getNullValue(
1165 Context.Target.getPointerWidth(0)),
1166 Context.getSizeType(),
1168 AllocArgs[0] = &Size;
1169 std::copy(PlaceArgs, PlaceArgs + NumPlaceArgs, AllocArgs.begin() + 1);
1171 // C++ [expr.new]p8:
1172 // If the allocated type is a non-array type, the allocation
1173 // function's name is operator new and the deallocation function's
1174 // name is operator delete. If the allocated type is an array
1175 // type, the allocation function's name is operator new[] and the
1176 // deallocation function's name is operator delete[].
1177 DeclarationName NewName = Context.DeclarationNames.getCXXOperatorName(
1178 IsArray ? OO_Array_New : OO_New);
1179 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
1180 IsArray ? OO_Array_Delete : OO_Delete);
1182 QualType AllocElemType = Context.getBaseElementType(AllocType);
1184 if (AllocElemType->isRecordType() && !UseGlobal) {
1185 CXXRecordDecl *Record
1186 = cast<CXXRecordDecl>(AllocElemType->getAs<RecordType>()->getDecl());
1187 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0],
1188 AllocArgs.size(), Record, /*AllowMissing=*/true,
1193 // Didn't find a member overload. Look for a global one.
1194 DeclareGlobalNewDelete();
1195 DeclContext *TUDecl = Context.getTranslationUnitDecl();
1196 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0],
1197 AllocArgs.size(), TUDecl, /*AllowMissing=*/false,
1202 // We don't need an operator delete if we're running under
1204 if (!getLangOptions().Exceptions) {
1209 // FindAllocationOverload can change the passed in arguments, so we need to
1211 if (NumPlaceArgs > 0)
1212 std::copy(&AllocArgs[1], AllocArgs.end(), PlaceArgs);
1214 // C++ [expr.new]p19:
1216 // If the new-expression begins with a unary :: operator, the
1217 // deallocation function's name is looked up in the global
1218 // scope. Otherwise, if the allocated type is a class type T or an
1219 // array thereof, the deallocation function's name is looked up in
1220 // the scope of T. If this lookup fails to find the name, or if
1221 // the allocated type is not a class type or array thereof, the
1222 // deallocation function's name is looked up in the global scope.
1223 LookupResult FoundDelete(*this, DeleteName, StartLoc, LookupOrdinaryName);
1224 if (AllocElemType->isRecordType() && !UseGlobal) {
1226 = cast<CXXRecordDecl>(AllocElemType->getAs<RecordType>()->getDecl());
1227 LookupQualifiedName(FoundDelete, RD);
1229 if (FoundDelete.isAmbiguous())
1230 return true; // FIXME: clean up expressions?
1232 if (FoundDelete.empty()) {
1233 DeclareGlobalNewDelete();
1234 LookupQualifiedName(FoundDelete, Context.getTranslationUnitDecl());
1237 FoundDelete.suppressDiagnostics();
1239 llvm::SmallVector<std::pair<DeclAccessPair,FunctionDecl*>, 2> Matches;
1241 // Whether we're looking for a placement operator delete is dictated
1242 // by whether we selected a placement operator new, not by whether
1243 // we had explicit placement arguments. This matters for things like
1244 // struct A { void *operator new(size_t, int = 0); ... };
1246 bool isPlacementNew = (NumPlaceArgs > 0 || OperatorNew->param_size() != 1);
1248 if (isPlacementNew) {
1249 // C++ [expr.new]p20:
1250 // A declaration of a placement deallocation function matches the
1251 // declaration of a placement allocation function if it has the
1252 // same number of parameters and, after parameter transformations
1253 // (8.3.5), all parameter types except the first are
1256 // To perform this comparison, we compute the function type that
1257 // the deallocation function should have, and use that type both
1258 // for template argument deduction and for comparison purposes.
1260 // FIXME: this comparison should ignore CC and the like.
1261 QualType ExpectedFunctionType;
1263 const FunctionProtoType *Proto
1264 = OperatorNew->getType()->getAs<FunctionProtoType>();
1266 llvm::SmallVector<QualType, 4> ArgTypes;
1267 ArgTypes.push_back(Context.VoidPtrTy);
1268 for (unsigned I = 1, N = Proto->getNumArgs(); I < N; ++I)
1269 ArgTypes.push_back(Proto->getArgType(I));
1271 FunctionProtoType::ExtProtoInfo EPI;
1272 EPI.Variadic = Proto->isVariadic();
1274 ExpectedFunctionType
1275 = Context.getFunctionType(Context.VoidTy, ArgTypes.data(),
1276 ArgTypes.size(), EPI);
1279 for (LookupResult::iterator D = FoundDelete.begin(),
1280 DEnd = FoundDelete.end();
1282 FunctionDecl *Fn = 0;
1283 if (FunctionTemplateDecl *FnTmpl
1284 = dyn_cast<FunctionTemplateDecl>((*D)->getUnderlyingDecl())) {
1285 // Perform template argument deduction to try to match the
1286 // expected function type.
1287 TemplateDeductionInfo Info(Context, StartLoc);
1288 if (DeduceTemplateArguments(FnTmpl, 0, ExpectedFunctionType, Fn, Info))
1291 Fn = cast<FunctionDecl>((*D)->getUnderlyingDecl());
1293 if (Context.hasSameType(Fn->getType(), ExpectedFunctionType))
1294 Matches.push_back(std::make_pair(D.getPair(), Fn));
1297 // C++ [expr.new]p20:
1298 // [...] Any non-placement deallocation function matches a
1299 // non-placement allocation function. [...]
1300 for (LookupResult::iterator D = FoundDelete.begin(),
1301 DEnd = FoundDelete.end();
1303 if (FunctionDecl *Fn = dyn_cast<FunctionDecl>((*D)->getUnderlyingDecl()))
1304 if (isNonPlacementDeallocationFunction(Fn))
1305 Matches.push_back(std::make_pair(D.getPair(), Fn));
1309 // C++ [expr.new]p20:
1310 // [...] If the lookup finds a single matching deallocation
1311 // function, that function will be called; otherwise, no
1312 // deallocation function will be called.
1313 if (Matches.size() == 1) {
1314 OperatorDelete = Matches[0].second;
1316 // C++0x [expr.new]p20:
1317 // If the lookup finds the two-parameter form of a usual
1318 // deallocation function (3.7.4.2) and that function, considered
1319 // as a placement deallocation function, would have been
1320 // selected as a match for the allocation function, the program
1322 if (NumPlaceArgs && getLangOptions().CPlusPlus0x &&
1323 isNonPlacementDeallocationFunction(OperatorDelete)) {
1324 Diag(StartLoc, diag::err_placement_new_non_placement_delete)
1325 << SourceRange(PlaceArgs[0]->getLocStart(),
1326 PlaceArgs[NumPlaceArgs - 1]->getLocEnd());
1327 Diag(OperatorDelete->getLocation(), diag::note_previous_decl)
1330 CheckAllocationAccess(StartLoc, Range, FoundDelete.getNamingClass(),
1338 /// FindAllocationOverload - Find an fitting overload for the allocation
1339 /// function in the specified scope.
1340 bool Sema::FindAllocationOverload(SourceLocation StartLoc, SourceRange Range,
1341 DeclarationName Name, Expr** Args,
1342 unsigned NumArgs, DeclContext *Ctx,
1343 bool AllowMissing, FunctionDecl *&Operator,
1345 LookupResult R(*this, Name, StartLoc, LookupOrdinaryName);
1346 LookupQualifiedName(R, Ctx);
1348 if (AllowMissing || !Diagnose)
1350 return Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
1354 if (R.isAmbiguous())
1357 R.suppressDiagnostics();
1359 OverloadCandidateSet Candidates(StartLoc);
1360 for (LookupResult::iterator Alloc = R.begin(), AllocEnd = R.end();
1361 Alloc != AllocEnd; ++Alloc) {
1362 // Even member operator new/delete are implicitly treated as
1363 // static, so don't use AddMemberCandidate.
1364 NamedDecl *D = (*Alloc)->getUnderlyingDecl();
1366 if (FunctionTemplateDecl *FnTemplate = dyn_cast<FunctionTemplateDecl>(D)) {
1367 AddTemplateOverloadCandidate(FnTemplate, Alloc.getPair(),
1368 /*ExplicitTemplateArgs=*/0, Args, NumArgs,
1370 /*SuppressUserConversions=*/false);
1374 FunctionDecl *Fn = cast<FunctionDecl>(D);
1375 AddOverloadCandidate(Fn, Alloc.getPair(), Args, NumArgs, Candidates,
1376 /*SuppressUserConversions=*/false);
1379 // Do the resolution.
1380 OverloadCandidateSet::iterator Best;
1381 switch (Candidates.BestViableFunction(*this, StartLoc, Best)) {
1384 FunctionDecl *FnDecl = Best->Function;
1385 MarkDeclarationReferenced(StartLoc, FnDecl);
1386 // The first argument is size_t, and the first parameter must be size_t,
1387 // too. This is checked on declaration and can be assumed. (It can't be
1388 // asserted on, though, since invalid decls are left in there.)
1389 // Watch out for variadic allocator function.
1390 unsigned NumArgsInFnDecl = FnDecl->getNumParams();
1391 for (unsigned i = 0; (i < NumArgs && i < NumArgsInFnDecl); ++i) {
1392 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
1393 FnDecl->getParamDecl(i));
1395 if (!Diagnose && !CanPerformCopyInitialization(Entity, Owned(Args[i])))
1399 = PerformCopyInitialization(Entity, SourceLocation(), Owned(Args[i]));
1400 if (Result.isInvalid())
1403 Args[i] = Result.takeAs<Expr>();
1406 CheckAllocationAccess(StartLoc, Range, R.getNamingClass(), Best->FoundDecl,
1411 case OR_No_Viable_Function:
1413 Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
1415 Candidates.NoteCandidates(*this, OCD_AllCandidates, Args, NumArgs);
1421 Diag(StartLoc, diag::err_ovl_ambiguous_call)
1423 Candidates.NoteCandidates(*this, OCD_ViableCandidates, Args, NumArgs);
1429 Diag(StartLoc, diag::err_ovl_deleted_call)
1430 << Best->Function->isDeleted()
1432 << getDeletedOrUnavailableSuffix(Best->Function)
1434 Candidates.NoteCandidates(*this, OCD_AllCandidates, Args, NumArgs);
1439 assert(false && "Unreachable, bad result from BestViableFunction");
1444 /// DeclareGlobalNewDelete - Declare the global forms of operator new and
1445 /// delete. These are:
1448 /// void* operator new(std::size_t) throw(std::bad_alloc);
1449 /// void* operator new[](std::size_t) throw(std::bad_alloc);
1450 /// void operator delete(void *) throw();
1451 /// void operator delete[](void *) throw();
1453 /// void* operator new(std::size_t);
1454 /// void* operator new[](std::size_t);
1455 /// void operator delete(void *);
1456 /// void operator delete[](void *);
1458 /// C++0x operator delete is implicitly noexcept.
1459 /// Note that the placement and nothrow forms of new are *not* implicitly
1460 /// declared. Their use requires including \<new\>.
1461 void Sema::DeclareGlobalNewDelete() {
1462 if (GlobalNewDeleteDeclared)
1465 // C++ [basic.std.dynamic]p2:
1466 // [...] The following allocation and deallocation functions (18.4) are
1467 // implicitly declared in global scope in each translation unit of a
1471 // void* operator new(std::size_t) throw(std::bad_alloc);
1472 // void* operator new[](std::size_t) throw(std::bad_alloc);
1473 // void operator delete(void*) throw();
1474 // void operator delete[](void*) throw();
1476 // void* operator new(std::size_t);
1477 // void* operator new[](std::size_t);
1478 // void operator delete(void*);
1479 // void operator delete[](void*);
1481 // These implicit declarations introduce only the function names operator
1482 // new, operator new[], operator delete, operator delete[].
1484 // Here, we need to refer to std::bad_alloc, so we will implicitly declare
1485 // "std" or "bad_alloc" as necessary to form the exception specification.
1486 // However, we do not make these implicit declarations visible to name
1488 // Note that the C++0x versions of operator delete are deallocation functions,
1489 // and thus are implicitly noexcept.
1490 if (!StdBadAlloc && !getLangOptions().CPlusPlus0x) {
1491 // The "std::bad_alloc" class has not yet been declared, so build it
1493 StdBadAlloc = CXXRecordDecl::Create(Context, TTK_Class,
1494 getOrCreateStdNamespace(),
1495 SourceLocation(), SourceLocation(),
1496 &PP.getIdentifierTable().get("bad_alloc"),
1498 getStdBadAlloc()->setImplicit(true);
1501 GlobalNewDeleteDeclared = true;
1503 QualType VoidPtr = Context.getPointerType(Context.VoidTy);
1504 QualType SizeT = Context.getSizeType();
1505 bool AssumeSaneOperatorNew = getLangOptions().AssumeSaneOperatorNew;
1507 DeclareGlobalAllocationFunction(
1508 Context.DeclarationNames.getCXXOperatorName(OO_New),
1509 VoidPtr, SizeT, AssumeSaneOperatorNew);
1510 DeclareGlobalAllocationFunction(
1511 Context.DeclarationNames.getCXXOperatorName(OO_Array_New),
1512 VoidPtr, SizeT, AssumeSaneOperatorNew);
1513 DeclareGlobalAllocationFunction(
1514 Context.DeclarationNames.getCXXOperatorName(OO_Delete),
1515 Context.VoidTy, VoidPtr);
1516 DeclareGlobalAllocationFunction(
1517 Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete),
1518 Context.VoidTy, VoidPtr);
1521 /// DeclareGlobalAllocationFunction - Declares a single implicit global
1522 /// allocation function if it doesn't already exist.
1523 void Sema::DeclareGlobalAllocationFunction(DeclarationName Name,
1524 QualType Return, QualType Argument,
1525 bool AddMallocAttr) {
1526 DeclContext *GlobalCtx = Context.getTranslationUnitDecl();
1528 // Check if this function is already declared.
1530 DeclContext::lookup_iterator Alloc, AllocEnd;
1531 for (llvm::tie(Alloc, AllocEnd) = GlobalCtx->lookup(Name);
1532 Alloc != AllocEnd; ++Alloc) {
1533 // Only look at non-template functions, as it is the predefined,
1534 // non-templated allocation function we are trying to declare here.
1535 if (FunctionDecl *Func = dyn_cast<FunctionDecl>(*Alloc)) {
1536 QualType InitialParamType =
1537 Context.getCanonicalType(
1538 Func->getParamDecl(0)->getType().getUnqualifiedType());
1539 // FIXME: Do we need to check for default arguments here?
1540 if (Func->getNumParams() == 1 && InitialParamType == Argument) {
1541 if(AddMallocAttr && !Func->hasAttr<MallocAttr>())
1542 Func->addAttr(::new (Context) MallocAttr(SourceLocation(), Context));
1549 QualType BadAllocType;
1550 bool HasBadAllocExceptionSpec
1551 = (Name.getCXXOverloadedOperator() == OO_New ||
1552 Name.getCXXOverloadedOperator() == OO_Array_New);
1553 if (HasBadAllocExceptionSpec && !getLangOptions().CPlusPlus0x) {
1554 assert(StdBadAlloc && "Must have std::bad_alloc declared");
1555 BadAllocType = Context.getTypeDeclType(getStdBadAlloc());
1558 FunctionProtoType::ExtProtoInfo EPI;
1559 if (HasBadAllocExceptionSpec) {
1560 if (!getLangOptions().CPlusPlus0x) {
1561 EPI.ExceptionSpecType = EST_Dynamic;
1562 EPI.NumExceptions = 1;
1563 EPI.Exceptions = &BadAllocType;
1566 EPI.ExceptionSpecType = getLangOptions().CPlusPlus0x ?
1567 EST_BasicNoexcept : EST_DynamicNone;
1570 QualType FnType = Context.getFunctionType(Return, &Argument, 1, EPI);
1571 FunctionDecl *Alloc =
1572 FunctionDecl::Create(Context, GlobalCtx, SourceLocation(),
1573 SourceLocation(), Name,
1574 FnType, /*TInfo=*/0, SC_None,
1575 SC_None, false, true);
1576 Alloc->setImplicit();
1579 Alloc->addAttr(::new (Context) MallocAttr(SourceLocation(), Context));
1581 ParmVarDecl *Param = ParmVarDecl::Create(Context, Alloc, SourceLocation(),
1582 SourceLocation(), 0,
1583 Argument, /*TInfo=*/0,
1584 SC_None, SC_None, 0);
1585 Alloc->setParams(&Param, 1);
1587 // FIXME: Also add this declaration to the IdentifierResolver, but
1588 // make sure it is at the end of the chain to coincide with the
1590 Context.getTranslationUnitDecl()->addDecl(Alloc);
1593 bool Sema::FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD,
1594 DeclarationName Name,
1595 FunctionDecl* &Operator, bool Diagnose) {
1596 LookupResult Found(*this, Name, StartLoc, LookupOrdinaryName);
1597 // Try to find operator delete/operator delete[] in class scope.
1598 LookupQualifiedName(Found, RD);
1600 if (Found.isAmbiguous())
1603 Found.suppressDiagnostics();
1605 llvm::SmallVector<DeclAccessPair,4> Matches;
1606 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end();
1608 NamedDecl *ND = (*F)->getUnderlyingDecl();
1610 // Ignore template operator delete members from the check for a usual
1611 // deallocation function.
1612 if (isa<FunctionTemplateDecl>(ND))
1615 if (cast<CXXMethodDecl>(ND)->isUsualDeallocationFunction())
1616 Matches.push_back(F.getPair());
1619 // There's exactly one suitable operator; pick it.
1620 if (Matches.size() == 1) {
1621 Operator = cast<CXXMethodDecl>(Matches[0]->getUnderlyingDecl());
1623 if (Operator->isDeleted()) {
1625 Diag(StartLoc, diag::err_deleted_function_use);
1626 Diag(Operator->getLocation(), diag::note_unavailable_here) << true;
1631 CheckAllocationAccess(StartLoc, SourceRange(), Found.getNamingClass(),
1632 Matches[0], Diagnose);
1635 // We found multiple suitable operators; complain about the ambiguity.
1636 } else if (!Matches.empty()) {
1638 Diag(StartLoc, diag::err_ambiguous_suitable_delete_member_function_found)
1641 for (llvm::SmallVectorImpl<DeclAccessPair>::iterator
1642 F = Matches.begin(), FEnd = Matches.end(); F != FEnd; ++F)
1643 Diag((*F)->getUnderlyingDecl()->getLocation(),
1644 diag::note_member_declared_here) << Name;
1649 // We did find operator delete/operator delete[] declarations, but
1650 // none of them were suitable.
1651 if (!Found.empty()) {
1653 Diag(StartLoc, diag::err_no_suitable_delete_member_function_found)
1656 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end();
1658 Diag((*F)->getUnderlyingDecl()->getLocation(),
1659 diag::note_member_declared_here) << Name;
1664 // Look for a global declaration.
1665 DeclareGlobalNewDelete();
1666 DeclContext *TUDecl = Context.getTranslationUnitDecl();
1668 CXXNullPtrLiteralExpr Null(Context.VoidPtrTy, SourceLocation());
1669 Expr* DeallocArgs[1];
1670 DeallocArgs[0] = &Null;
1671 if (FindAllocationOverload(StartLoc, SourceRange(), Name,
1672 DeallocArgs, 1, TUDecl, !Diagnose,
1673 Operator, Diagnose))
1676 assert(Operator && "Did not find a deallocation function!");
1680 /// ActOnCXXDelete - Parsed a C++ 'delete' expression (C++ 5.3.5), as in:
1681 /// @code ::delete ptr; @endcode
1683 /// @code delete [] ptr; @endcode
1685 Sema::ActOnCXXDelete(SourceLocation StartLoc, bool UseGlobal,
1686 bool ArrayForm, Expr *ExE) {
1687 // C++ [expr.delete]p1:
1688 // The operand shall have a pointer type, or a class type having a single
1689 // conversion function to a pointer type. The result has type void.
1691 // DR599 amends "pointer type" to "pointer to object type" in both cases.
1693 ExprResult Ex = Owned(ExE);
1694 FunctionDecl *OperatorDelete = 0;
1695 bool ArrayFormAsWritten = ArrayForm;
1696 bool UsualArrayDeleteWantsSize = false;
1698 if (!Ex.get()->isTypeDependent()) {
1699 QualType Type = Ex.get()->getType();
1701 if (const RecordType *Record = Type->getAs<RecordType>()) {
1702 if (RequireCompleteType(StartLoc, Type,
1703 PDiag(diag::err_delete_incomplete_class_type)))
1706 llvm::SmallVector<CXXConversionDecl*, 4> ObjectPtrConversions;
1708 CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
1709 const UnresolvedSetImpl *Conversions = RD->getVisibleConversionFunctions();
1710 for (UnresolvedSetImpl::iterator I = Conversions->begin(),
1711 E = Conversions->end(); I != E; ++I) {
1712 NamedDecl *D = I.getDecl();
1713 if (isa<UsingShadowDecl>(D))
1714 D = cast<UsingShadowDecl>(D)->getTargetDecl();
1716 // Skip over templated conversion functions; they aren't considered.
1717 if (isa<FunctionTemplateDecl>(D))
1720 CXXConversionDecl *Conv = cast<CXXConversionDecl>(D);
1722 QualType ConvType = Conv->getConversionType().getNonReferenceType();
1723 if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>())
1724 if (ConvPtrType->getPointeeType()->isIncompleteOrObjectType())
1725 ObjectPtrConversions.push_back(Conv);
1727 if (ObjectPtrConversions.size() == 1) {
1728 // We have a single conversion to a pointer-to-object type. Perform
1730 // TODO: don't redo the conversion calculation.
1732 PerformImplicitConversion(Ex.get(),
1733 ObjectPtrConversions.front()->getConversionType(),
1735 if (Res.isUsable()) {
1737 Type = Ex.get()->getType();
1740 else if (ObjectPtrConversions.size() > 1) {
1741 Diag(StartLoc, diag::err_ambiguous_delete_operand)
1742 << Type << Ex.get()->getSourceRange();
1743 for (unsigned i= 0; i < ObjectPtrConversions.size(); i++)
1744 NoteOverloadCandidate(ObjectPtrConversions[i]);
1749 if (!Type->isPointerType())
1750 return ExprError(Diag(StartLoc, diag::err_delete_operand)
1751 << Type << Ex.get()->getSourceRange());
1753 QualType Pointee = Type->getAs<PointerType>()->getPointeeType();
1754 if (Pointee->isVoidType() && !isSFINAEContext()) {
1755 // The C++ standard bans deleting a pointer to a non-object type, which
1756 // effectively bans deletion of "void*". However, most compilers support
1757 // this, so we treat it as a warning unless we're in a SFINAE context.
1758 Diag(StartLoc, diag::ext_delete_void_ptr_operand)
1759 << Type << Ex.get()->getSourceRange();
1760 } else if (Pointee->isFunctionType() || Pointee->isVoidType())
1761 return ExprError(Diag(StartLoc, diag::err_delete_operand)
1762 << Type << Ex.get()->getSourceRange());
1763 else if (!Pointee->isDependentType() &&
1764 RequireCompleteType(StartLoc, Pointee,
1765 PDiag(diag::warn_delete_incomplete)
1766 << Ex.get()->getSourceRange()))
1768 else if (unsigned AddressSpace = Pointee.getAddressSpace())
1769 return Diag(Ex.get()->getLocStart(),
1770 diag::err_address_space_qualified_delete)
1771 << Pointee.getUnqualifiedType() << AddressSpace;
1772 // C++ [expr.delete]p2:
1773 // [Note: a pointer to a const type can be the operand of a
1774 // delete-expression; it is not necessary to cast away the constness
1775 // (5.2.11) of the pointer expression before it is used as the operand
1776 // of the delete-expression. ]
1777 Ex = ImpCastExprToType(Ex.take(), Context.getPointerType(Context.VoidTy),
1780 if (Pointee->isArrayType() && !ArrayForm) {
1781 Diag(StartLoc, diag::warn_delete_array_type)
1782 << Type << Ex.get()->getSourceRange()
1783 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(StartLoc), "[]");
1787 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
1788 ArrayForm ? OO_Array_Delete : OO_Delete);
1790 QualType PointeeElem = Context.getBaseElementType(Pointee);
1791 if (const RecordType *RT = PointeeElem->getAs<RecordType>()) {
1792 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
1795 FindDeallocationFunction(StartLoc, RD, DeleteName, OperatorDelete))
1798 // If we're allocating an array of records, check whether the
1799 // usual operator delete[] has a size_t parameter.
1801 // If the user specifically asked to use the global allocator,
1802 // we'll need to do the lookup into the class.
1804 UsualArrayDeleteWantsSize =
1805 doesUsualArrayDeleteWantSize(*this, StartLoc, PointeeElem);
1807 // Otherwise, the usual operator delete[] should be the
1808 // function we just found.
1809 else if (isa<CXXMethodDecl>(OperatorDelete))
1810 UsualArrayDeleteWantsSize = (OperatorDelete->getNumParams() == 2);
1813 if (!RD->hasTrivialDestructor())
1814 if (CXXDestructorDecl *Dtor = LookupDestructor(RD)) {
1815 MarkDeclarationReferenced(StartLoc,
1816 const_cast<CXXDestructorDecl*>(Dtor));
1817 DiagnoseUseOfDecl(Dtor, StartLoc);
1820 // C++ [expr.delete]p3:
1821 // In the first alternative (delete object), if the static type of the
1822 // object to be deleted is different from its dynamic type, the static
1823 // type shall be a base class of the dynamic type of the object to be
1824 // deleted and the static type shall have a virtual destructor or the
1825 // behavior is undefined.
1827 // Note: a final class cannot be derived from, no issue there
1828 if (!ArrayForm && RD->isPolymorphic() && !RD->hasAttr<FinalAttr>()) {
1829 CXXDestructorDecl *dtor = RD->getDestructor();
1830 if (!dtor || !dtor->isVirtual())
1831 Diag(StartLoc, diag::warn_delete_non_virtual_dtor) << PointeeElem;
1835 if (!OperatorDelete) {
1836 // Look for a global declaration.
1837 DeclareGlobalNewDelete();
1838 DeclContext *TUDecl = Context.getTranslationUnitDecl();
1839 Expr *Arg = Ex.get();
1840 if (FindAllocationOverload(StartLoc, SourceRange(), DeleteName,
1841 &Arg, 1, TUDecl, /*AllowMissing=*/false,
1846 MarkDeclarationReferenced(StartLoc, OperatorDelete);
1848 // Check access and ambiguity of operator delete and destructor.
1849 if (const RecordType *RT = PointeeElem->getAs<RecordType>()) {
1850 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
1851 if (CXXDestructorDecl *Dtor = LookupDestructor(RD)) {
1852 CheckDestructorAccess(Ex.get()->getExprLoc(), Dtor,
1853 PDiag(diag::err_access_dtor) << PointeeElem);
1859 return Owned(new (Context) CXXDeleteExpr(Context.VoidTy, UseGlobal, ArrayForm,
1861 UsualArrayDeleteWantsSize,
1862 OperatorDelete, Ex.take(), StartLoc));
1865 /// \brief Check the use of the given variable as a C++ condition in an if,
1866 /// while, do-while, or switch statement.
1867 ExprResult Sema::CheckConditionVariable(VarDecl *ConditionVar,
1868 SourceLocation StmtLoc,
1869 bool ConvertToBoolean) {
1870 QualType T = ConditionVar->getType();
1872 // C++ [stmt.select]p2:
1873 // The declarator shall not specify a function or an array.
1874 if (T->isFunctionType())
1875 return ExprError(Diag(ConditionVar->getLocation(),
1876 diag::err_invalid_use_of_function_type)
1877 << ConditionVar->getSourceRange());
1878 else if (T->isArrayType())
1879 return ExprError(Diag(ConditionVar->getLocation(),
1880 diag::err_invalid_use_of_array_type)
1881 << ConditionVar->getSourceRange());
1883 ExprResult Condition =
1884 Owned(DeclRefExpr::Create(Context, NestedNameSpecifierLoc(),
1886 ConditionVar->getLocation(),
1887 ConditionVar->getType().getNonReferenceType(),
1889 if (ConvertToBoolean) {
1890 Condition = CheckBooleanCondition(Condition.take(), StmtLoc);
1891 if (Condition.isInvalid())
1895 return move(Condition);
1898 /// CheckCXXBooleanCondition - Returns true if a conversion to bool is invalid.
1899 ExprResult Sema::CheckCXXBooleanCondition(Expr *CondExpr) {
1901 // The value of a condition that is an initialized declaration in a statement
1902 // other than a switch statement is the value of the declared variable
1903 // implicitly converted to type bool. If that conversion is ill-formed, the
1904 // program is ill-formed.
1905 // The value of a condition that is an expression is the value of the
1906 // expression, implicitly converted to bool.
1908 return PerformContextuallyConvertToBool(CondExpr);
1911 /// Helper function to determine whether this is the (deprecated) C++
1912 /// conversion from a string literal to a pointer to non-const char or
1913 /// non-const wchar_t (for narrow and wide string literals,
1916 Sema::IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType) {
1917 // Look inside the implicit cast, if it exists.
1918 if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(From))
1919 From = Cast->getSubExpr();
1921 // A string literal (2.13.4) that is not a wide string literal can
1922 // be converted to an rvalue of type "pointer to char"; a wide
1923 // string literal can be converted to an rvalue of type "pointer
1924 // to wchar_t" (C++ 4.2p2).
1925 if (StringLiteral *StrLit = dyn_cast<StringLiteral>(From->IgnoreParens()))
1926 if (const PointerType *ToPtrType = ToType->getAs<PointerType>())
1927 if (const BuiltinType *ToPointeeType
1928 = ToPtrType->getPointeeType()->getAs<BuiltinType>()) {
1929 // This conversion is considered only when there is an
1930 // explicit appropriate pointer target type (C++ 4.2p2).
1931 if (!ToPtrType->getPointeeType().hasQualifiers() &&
1932 ((StrLit->isWide() && ToPointeeType->isWideCharType()) ||
1933 (!StrLit->isWide() &&
1934 (ToPointeeType->getKind() == BuiltinType::Char_U ||
1935 ToPointeeType->getKind() == BuiltinType::Char_S))))
1942 static ExprResult BuildCXXCastArgument(Sema &S,
1943 SourceLocation CastLoc,
1946 CXXMethodDecl *Method,
1947 NamedDecl *FoundDecl,
1950 default: assert(0 && "Unhandled cast kind!");
1951 case CK_ConstructorConversion: {
1952 ASTOwningVector<Expr*> ConstructorArgs(S);
1954 if (S.CompleteConstructorCall(cast<CXXConstructorDecl>(Method),
1955 MultiExprArg(&From, 1),
1956 CastLoc, ConstructorArgs))
1960 S.BuildCXXConstructExpr(CastLoc, Ty, cast<CXXConstructorDecl>(Method),
1961 move_arg(ConstructorArgs),
1962 /*ZeroInit*/ false, CXXConstructExpr::CK_Complete,
1964 if (Result.isInvalid())
1967 return S.MaybeBindToTemporary(Result.takeAs<Expr>());
1970 case CK_UserDefinedConversion: {
1971 assert(!From->getType()->isPointerType() && "Arg can't have pointer type!");
1973 // Create an implicit call expr that calls it.
1974 ExprResult Result = S.BuildCXXMemberCallExpr(From, FoundDecl, Method);
1975 if (Result.isInvalid())
1978 return S.MaybeBindToTemporary(Result.get());
1983 /// PerformImplicitConversion - Perform an implicit conversion of the
1984 /// expression From to the type ToType using the pre-computed implicit
1985 /// conversion sequence ICS. Returns the converted
1986 /// expression. Action is the kind of conversion we're performing,
1987 /// used in the error message.
1989 Sema::PerformImplicitConversion(Expr *From, QualType ToType,
1990 const ImplicitConversionSequence &ICS,
1991 AssignmentAction Action, bool CStyle) {
1992 switch (ICS.getKind()) {
1993 case ImplicitConversionSequence::StandardConversion: {
1994 ExprResult Res = PerformImplicitConversion(From, ToType, ICS.Standard,
1996 if (Res.isInvalid())
2002 case ImplicitConversionSequence::UserDefinedConversion: {
2004 FunctionDecl *FD = ICS.UserDefined.ConversionFunction;
2006 QualType BeforeToType;
2007 if (const CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(FD)) {
2008 CastKind = CK_UserDefinedConversion;
2010 // If the user-defined conversion is specified by a conversion function,
2011 // the initial standard conversion sequence converts the source type to
2012 // the implicit object parameter of the conversion function.
2013 BeforeToType = Context.getTagDeclType(Conv->getParent());
2015 const CXXConstructorDecl *Ctor = cast<CXXConstructorDecl>(FD);
2016 CastKind = CK_ConstructorConversion;
2017 // Do no conversion if dealing with ... for the first conversion.
2018 if (!ICS.UserDefined.EllipsisConversion) {
2019 // If the user-defined conversion is specified by a constructor, the
2020 // initial standard conversion sequence converts the source type to the
2021 // type required by the argument of the constructor
2022 BeforeToType = Ctor->getParamDecl(0)->getType().getNonReferenceType();
2025 // Watch out for elipsis conversion.
2026 if (!ICS.UserDefined.EllipsisConversion) {
2028 PerformImplicitConversion(From, BeforeToType,
2029 ICS.UserDefined.Before, AA_Converting,
2031 if (Res.isInvalid())
2037 = BuildCXXCastArgument(*this,
2038 From->getLocStart(),
2039 ToType.getNonReferenceType(),
2040 CastKind, cast<CXXMethodDecl>(FD),
2041 ICS.UserDefined.FoundConversionFunction,
2044 if (CastArg.isInvalid())
2047 From = CastArg.take();
2049 return PerformImplicitConversion(From, ToType, ICS.UserDefined.After,
2050 AA_Converting, CStyle);
2053 case ImplicitConversionSequence::AmbiguousConversion:
2054 ICS.DiagnoseAmbiguousConversion(*this, From->getExprLoc(),
2055 PDiag(diag::err_typecheck_ambiguous_condition)
2056 << From->getSourceRange());
2059 case ImplicitConversionSequence::EllipsisConversion:
2060 assert(false && "Cannot perform an ellipsis conversion");
2063 case ImplicitConversionSequence::BadConversion:
2067 // Everything went well.
2071 /// PerformImplicitConversion - Perform an implicit conversion of the
2072 /// expression From to the type ToType by following the standard
2073 /// conversion sequence SCS. Returns the converted
2074 /// expression. Flavor is the context in which we're performing this
2075 /// conversion, for use in error messages.
2077 Sema::PerformImplicitConversion(Expr *From, QualType ToType,
2078 const StandardConversionSequence& SCS,
2079 AssignmentAction Action, bool CStyle) {
2080 // Overall FIXME: we are recomputing too many types here and doing far too
2081 // much extra work. What this means is that we need to keep track of more
2082 // information that is computed when we try the implicit conversion initially,
2083 // so that we don't need to recompute anything here.
2084 QualType FromType = From->getType();
2086 if (SCS.CopyConstructor) {
2087 // FIXME: When can ToType be a reference type?
2088 assert(!ToType->isReferenceType());
2089 if (SCS.Second == ICK_Derived_To_Base) {
2090 ASTOwningVector<Expr*> ConstructorArgs(*this);
2091 if (CompleteConstructorCall(cast<CXXConstructorDecl>(SCS.CopyConstructor),
2092 MultiExprArg(*this, &From, 1),
2093 /*FIXME:ConstructLoc*/SourceLocation(),
2096 return BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(),
2097 ToType, SCS.CopyConstructor,
2098 move_arg(ConstructorArgs),
2100 CXXConstructExpr::CK_Complete,
2103 return BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(),
2104 ToType, SCS.CopyConstructor,
2105 MultiExprArg(*this, &From, 1),
2107 CXXConstructExpr::CK_Complete,
2111 // Resolve overloaded function references.
2112 if (Context.hasSameType(FromType, Context.OverloadTy)) {
2113 DeclAccessPair Found;
2114 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(From, ToType,
2119 if (DiagnoseUseOfDecl(Fn, From->getSourceRange().getBegin()))
2122 From = FixOverloadedFunctionReference(From, Found, Fn);
2123 FromType = From->getType();
2126 // Perform the first implicit conversion.
2127 switch (SCS.First) {
2132 case ICK_Lvalue_To_Rvalue:
2133 // Should this get its own ICK?
2134 if (From->getObjectKind() == OK_ObjCProperty) {
2135 ExprResult FromRes = ConvertPropertyForRValue(From);
2136 if (FromRes.isInvalid())
2138 From = FromRes.take();
2139 if (!From->isGLValue()) break;
2142 // Check for trivial buffer overflows.
2143 CheckArrayAccess(From);
2145 FromType = FromType.getUnqualifiedType();
2146 From = ImplicitCastExpr::Create(Context, FromType, CK_LValueToRValue,
2147 From, 0, VK_RValue);
2150 case ICK_Array_To_Pointer:
2151 FromType = Context.getArrayDecayedType(FromType);
2152 From = ImpCastExprToType(From, FromType, CK_ArrayToPointerDecay).take();
2155 case ICK_Function_To_Pointer:
2156 FromType = Context.getPointerType(FromType);
2157 From = ImpCastExprToType(From, FromType, CK_FunctionToPointerDecay).take();
2161 assert(false && "Improper first standard conversion");
2165 // Perform the second implicit conversion
2166 switch (SCS.Second) {
2168 // If both sides are functions (or pointers/references to them), there could
2169 // be incompatible exception declarations.
2170 if (CheckExceptionSpecCompatibility(From, ToType))
2172 // Nothing else to do.
2175 case ICK_NoReturn_Adjustment:
2176 // If both sides are functions (or pointers/references to them), there could
2177 // be incompatible exception declarations.
2178 if (CheckExceptionSpecCompatibility(From, ToType))
2181 From = ImpCastExprToType(From, ToType, CK_NoOp).take();
2184 case ICK_Integral_Promotion:
2185 case ICK_Integral_Conversion:
2186 From = ImpCastExprToType(From, ToType, CK_IntegralCast).take();
2189 case ICK_Floating_Promotion:
2190 case ICK_Floating_Conversion:
2191 From = ImpCastExprToType(From, ToType, CK_FloatingCast).take();
2194 case ICK_Complex_Promotion:
2195 case ICK_Complex_Conversion: {
2196 QualType FromEl = From->getType()->getAs<ComplexType>()->getElementType();
2197 QualType ToEl = ToType->getAs<ComplexType>()->getElementType();
2199 if (FromEl->isRealFloatingType()) {
2200 if (ToEl->isRealFloatingType())
2201 CK = CK_FloatingComplexCast;
2203 CK = CK_FloatingComplexToIntegralComplex;
2204 } else if (ToEl->isRealFloatingType()) {
2205 CK = CK_IntegralComplexToFloatingComplex;
2207 CK = CK_IntegralComplexCast;
2209 From = ImpCastExprToType(From, ToType, CK).take();
2213 case ICK_Floating_Integral:
2214 if (ToType->isRealFloatingType())
2215 From = ImpCastExprToType(From, ToType, CK_IntegralToFloating).take();
2217 From = ImpCastExprToType(From, ToType, CK_FloatingToIntegral).take();
2220 case ICK_Compatible_Conversion:
2221 From = ImpCastExprToType(From, ToType, CK_NoOp).take();
2224 case ICK_Pointer_Conversion: {
2225 if (SCS.IncompatibleObjC && Action != AA_Casting) {
2226 // Diagnose incompatible Objective-C conversions
2227 if (Action == AA_Initializing || Action == AA_Assigning)
2228 Diag(From->getSourceRange().getBegin(),
2229 diag::ext_typecheck_convert_incompatible_pointer)
2230 << ToType << From->getType() << Action
2231 << From->getSourceRange();
2233 Diag(From->getSourceRange().getBegin(),
2234 diag::ext_typecheck_convert_incompatible_pointer)
2235 << From->getType() << ToType << Action
2236 << From->getSourceRange();
2238 if (From->getType()->isObjCObjectPointerType() &&
2239 ToType->isObjCObjectPointerType())
2240 EmitRelatedResultTypeNote(From);
2243 CastKind Kind = CK_Invalid;
2244 CXXCastPath BasePath;
2245 if (CheckPointerConversion(From, ToType, Kind, BasePath, CStyle))
2247 From = ImpCastExprToType(From, ToType, Kind, VK_RValue, &BasePath).take();
2251 case ICK_Pointer_Member: {
2252 CastKind Kind = CK_Invalid;
2253 CXXCastPath BasePath;
2254 if (CheckMemberPointerConversion(From, ToType, Kind, BasePath, CStyle))
2256 if (CheckExceptionSpecCompatibility(From, ToType))
2258 From = ImpCastExprToType(From, ToType, Kind, VK_RValue, &BasePath).take();
2262 case ICK_Boolean_Conversion:
2263 From = ImpCastExprToType(From, Context.BoolTy,
2264 ScalarTypeToBooleanCastKind(FromType)).take();
2267 case ICK_Derived_To_Base: {
2268 CXXCastPath BasePath;
2269 if (CheckDerivedToBaseConversion(From->getType(),
2270 ToType.getNonReferenceType(),
2271 From->getLocStart(),
2272 From->getSourceRange(),
2277 From = ImpCastExprToType(From, ToType.getNonReferenceType(),
2278 CK_DerivedToBase, CastCategory(From),
2283 case ICK_Vector_Conversion:
2284 From = ImpCastExprToType(From, ToType, CK_BitCast).take();
2287 case ICK_Vector_Splat:
2288 From = ImpCastExprToType(From, ToType, CK_VectorSplat).take();
2291 case ICK_Complex_Real:
2292 // Case 1. x -> _Complex y
2293 if (const ComplexType *ToComplex = ToType->getAs<ComplexType>()) {
2294 QualType ElType = ToComplex->getElementType();
2295 bool isFloatingComplex = ElType->isRealFloatingType();
2298 if (Context.hasSameUnqualifiedType(ElType, From->getType())) {
2300 } else if (From->getType()->isRealFloatingType()) {
2301 From = ImpCastExprToType(From, ElType,
2302 isFloatingComplex ? CK_FloatingCast : CK_FloatingToIntegral).take();
2304 assert(From->getType()->isIntegerType());
2305 From = ImpCastExprToType(From, ElType,
2306 isFloatingComplex ? CK_IntegralToFloating : CK_IntegralCast).take();
2309 From = ImpCastExprToType(From, ToType,
2310 isFloatingComplex ? CK_FloatingRealToComplex
2311 : CK_IntegralRealToComplex).take();
2313 // Case 2. _Complex x -> y
2315 const ComplexType *FromComplex = From->getType()->getAs<ComplexType>();
2316 assert(FromComplex);
2318 QualType ElType = FromComplex->getElementType();
2319 bool isFloatingComplex = ElType->isRealFloatingType();
2322 From = ImpCastExprToType(From, ElType,
2323 isFloatingComplex ? CK_FloatingComplexToReal
2324 : CK_IntegralComplexToReal).take();
2327 if (Context.hasSameUnqualifiedType(ElType, ToType)) {
2329 } else if (ToType->isRealFloatingType()) {
2330 From = ImpCastExprToType(From, ToType,
2331 isFloatingComplex ? CK_FloatingCast : CK_IntegralToFloating).take();
2333 assert(ToType->isIntegerType());
2334 From = ImpCastExprToType(From, ToType,
2335 isFloatingComplex ? CK_FloatingToIntegral : CK_IntegralCast).take();
2340 case ICK_Block_Pointer_Conversion: {
2341 From = ImpCastExprToType(From, ToType.getUnqualifiedType(), CK_BitCast,
2346 case ICK_TransparentUnionConversion: {
2347 ExprResult FromRes = Owned(From);
2348 Sema::AssignConvertType ConvTy =
2349 CheckTransparentUnionArgumentConstraints(ToType, FromRes);
2350 if (FromRes.isInvalid())
2352 From = FromRes.take();
2353 assert ((ConvTy == Sema::Compatible) &&
2354 "Improper transparent union conversion");
2359 case ICK_Lvalue_To_Rvalue:
2360 case ICK_Array_To_Pointer:
2361 case ICK_Function_To_Pointer:
2362 case ICK_Qualification:
2363 case ICK_Num_Conversion_Kinds:
2364 assert(false && "Improper second standard conversion");
2368 switch (SCS.Third) {
2373 case ICK_Qualification: {
2374 // The qualification keeps the category of the inner expression, unless the
2375 // target type isn't a reference.
2376 ExprValueKind VK = ToType->isReferenceType() ?
2377 CastCategory(From) : VK_RValue;
2378 From = ImpCastExprToType(From, ToType.getNonLValueExprType(Context),
2379 CK_NoOp, VK).take();
2381 if (SCS.DeprecatedStringLiteralToCharPtr &&
2382 !getLangOptions().WritableStrings)
2383 Diag(From->getLocStart(), diag::warn_deprecated_string_literal_conversion)
2384 << ToType.getNonReferenceType();
2390 assert(false && "Improper third standard conversion");
2397 ExprResult Sema::ActOnUnaryTypeTrait(UnaryTypeTrait UTT,
2398 SourceLocation KWLoc,
2400 SourceLocation RParen) {
2401 TypeSourceInfo *TSInfo;
2402 QualType T = GetTypeFromParser(Ty, &TSInfo);
2405 TSInfo = Context.getTrivialTypeSourceInfo(T);
2406 return BuildUnaryTypeTrait(UTT, KWLoc, TSInfo, RParen);
2409 /// \brief Check the completeness of a type in a unary type trait.
2411 /// If the particular type trait requires a complete type, tries to complete
2412 /// it. If completing the type fails, a diagnostic is emitted and false
2413 /// returned. If completing the type succeeds or no completion was required,
2415 static bool CheckUnaryTypeTraitTypeCompleteness(Sema &S,
2419 // C++0x [meta.unary.prop]p3:
2420 // For all of the class templates X declared in this Clause, instantiating
2421 // that template with a template argument that is a class template
2422 // specialization may result in the implicit instantiation of the template
2423 // argument if and only if the semantics of X require that the argument
2424 // must be a complete type.
2425 // We apply this rule to all the type trait expressions used to implement
2426 // these class templates. We also try to follow any GCC documented behavior
2427 // in these expressions to ensure portability of standard libraries.
2429 // is_complete_type somewhat obviously cannot require a complete type.
2430 case UTT_IsCompleteType:
2433 // These traits are modeled on the type predicates in C++0x
2434 // [meta.unary.cat] and [meta.unary.comp]. They are not specified as
2435 // requiring a complete type, as whether or not they return true cannot be
2436 // impacted by the completeness of the type.
2438 case UTT_IsIntegral:
2439 case UTT_IsFloatingPoint:
2442 case UTT_IsLvalueReference:
2443 case UTT_IsRvalueReference:
2444 case UTT_IsMemberFunctionPointer:
2445 case UTT_IsMemberObjectPointer:
2449 case UTT_IsFunction:
2450 case UTT_IsReference:
2451 case UTT_IsArithmetic:
2452 case UTT_IsFundamental:
2455 case UTT_IsCompound:
2456 case UTT_IsMemberPointer:
2459 // These traits are modeled on type predicates in C++0x [meta.unary.prop]
2460 // which requires some of its traits to have the complete type. However,
2461 // the completeness of the type cannot impact these traits' semantics, and
2462 // so they don't require it. This matches the comments on these traits in
2465 case UTT_IsVolatile:
2467 case UTT_IsUnsigned:
2470 // C++0x [meta.unary.prop] Table 49 requires the following traits to be
2471 // applied to a complete type.
2473 case UTT_IsTriviallyCopyable:
2474 case UTT_IsStandardLayout:
2478 case UTT_IsPolymorphic:
2479 case UTT_IsAbstract:
2482 // These trait expressions are designed to help implement predicates in
2483 // [meta.unary.prop] despite not being named the same. They are specified
2484 // by both GCC and the Embarcadero C++ compiler, and require the complete
2485 // type due to the overarching C++0x type predicates being implemented
2486 // requiring the complete type.
2487 case UTT_HasNothrowAssign:
2488 case UTT_HasNothrowConstructor:
2489 case UTT_HasNothrowCopy:
2490 case UTT_HasTrivialAssign:
2491 case UTT_HasTrivialDefaultConstructor:
2492 case UTT_HasTrivialCopy:
2493 case UTT_HasTrivialDestructor:
2494 case UTT_HasVirtualDestructor:
2495 // Arrays of unknown bound are expressly allowed.
2496 QualType ElTy = ArgTy;
2497 if (ArgTy->isIncompleteArrayType())
2498 ElTy = S.Context.getAsArrayType(ArgTy)->getElementType();
2500 // The void type is expressly allowed.
2501 if (ElTy->isVoidType())
2504 return !S.RequireCompleteType(
2505 Loc, ElTy, diag::err_incomplete_type_used_in_type_trait_expr);
2507 llvm_unreachable("Type trait not handled by switch");
2510 static bool EvaluateUnaryTypeTrait(Sema &Self, UnaryTypeTrait UTT,
2511 SourceLocation KeyLoc, QualType T) {
2512 assert(!T->isDependentType() && "Cannot evaluate traits of dependent type");
2514 ASTContext &C = Self.Context;
2516 // Type trait expressions corresponding to the primary type category
2517 // predicates in C++0x [meta.unary.cat].
2519 return T->isVoidType();
2520 case UTT_IsIntegral:
2521 return T->isIntegralType(C);
2522 case UTT_IsFloatingPoint:
2523 return T->isFloatingType();
2525 return T->isArrayType();
2527 return T->isPointerType();
2528 case UTT_IsLvalueReference:
2529 return T->isLValueReferenceType();
2530 case UTT_IsRvalueReference:
2531 return T->isRValueReferenceType();
2532 case UTT_IsMemberFunctionPointer:
2533 return T->isMemberFunctionPointerType();
2534 case UTT_IsMemberObjectPointer:
2535 return T->isMemberDataPointerType();
2537 return T->isEnumeralType();
2539 return T->isUnionType();
2541 return T->isClassType() || T->isStructureType();
2542 case UTT_IsFunction:
2543 return T->isFunctionType();
2545 // Type trait expressions which correspond to the convenient composition
2546 // predicates in C++0x [meta.unary.comp].
2547 case UTT_IsReference:
2548 return T->isReferenceType();
2549 case UTT_IsArithmetic:
2550 return T->isArithmeticType() && !T->isEnumeralType();
2551 case UTT_IsFundamental:
2552 return T->isFundamentalType();
2554 return T->isObjectType();
2556 return T->isScalarType();
2557 case UTT_IsCompound:
2558 return T->isCompoundType();
2559 case UTT_IsMemberPointer:
2560 return T->isMemberPointerType();
2562 // Type trait expressions which correspond to the type property predicates
2563 // in C++0x [meta.unary.prop].
2565 return T.isConstQualified();
2566 case UTT_IsVolatile:
2567 return T.isVolatileQualified();
2569 return T->isTrivialType();
2570 case UTT_IsTriviallyCopyable:
2571 return T->isTriviallyCopyableType();
2572 case UTT_IsStandardLayout:
2573 return T->isStandardLayoutType();
2575 return T->isPODType();
2577 return T->isLiteralType();
2579 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
2580 return !RD->isUnion() && RD->isEmpty();
2582 case UTT_IsPolymorphic:
2583 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
2584 return RD->isPolymorphic();
2586 case UTT_IsAbstract:
2587 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
2588 return RD->isAbstract();
2591 return T->isSignedIntegerType();
2592 case UTT_IsUnsigned:
2593 return T->isUnsignedIntegerType();
2595 // Type trait expressions which query classes regarding their construction,
2596 // destruction, and copying. Rather than being based directly on the
2597 // related type predicates in the standard, they are specified by both
2598 // GCC[1] and the Embarcadero C++ compiler[2], and Clang implements those
2601 // 1: http://gcc.gnu/.org/onlinedocs/gcc/Type-Traits.html
2602 // 2: http://docwiki.embarcadero.com/RADStudio/XE/en/Type_Trait_Functions_(C%2B%2B0x)_Index
2603 case UTT_HasTrivialDefaultConstructor:
2604 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2605 // If __is_pod (type) is true then the trait is true, else if type is
2606 // a cv class or union type (or array thereof) with a trivial default
2607 // constructor ([class.ctor]) then the trait is true, else it is false.
2610 if (const RecordType *RT =
2611 C.getBaseElementType(T)->getAs<RecordType>())
2612 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialDefaultConstructor();
2614 case UTT_HasTrivialCopy:
2615 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2616 // If __is_pod (type) is true or type is a reference type then
2617 // the trait is true, else if type is a cv class or union type
2618 // with a trivial copy constructor ([class.copy]) then the trait
2619 // is true, else it is false.
2620 if (T->isPODType() || T->isReferenceType())
2622 if (const RecordType *RT = T->getAs<RecordType>())
2623 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialCopyConstructor();
2625 case UTT_HasTrivialAssign:
2626 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2627 // If type is const qualified or is a reference type then the
2628 // trait is false. Otherwise if __is_pod (type) is true then the
2629 // trait is true, else if type is a cv class or union type with
2630 // a trivial copy assignment ([class.copy]) then the trait is
2631 // true, else it is false.
2632 // Note: the const and reference restrictions are interesting,
2633 // given that const and reference members don't prevent a class
2634 // from having a trivial copy assignment operator (but do cause
2635 // errors if the copy assignment operator is actually used, q.v.
2636 // [class.copy]p12).
2638 if (C.getBaseElementType(T).isConstQualified())
2642 if (const RecordType *RT = T->getAs<RecordType>())
2643 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialCopyAssignment();
2645 case UTT_HasTrivialDestructor:
2646 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2647 // If __is_pod (type) is true or type is a reference type
2648 // then the trait is true, else if type is a cv class or union
2649 // type (or array thereof) with a trivial destructor
2650 // ([class.dtor]) then the trait is true, else it is
2652 if (T->isPODType() || T->isReferenceType())
2654 if (const RecordType *RT =
2655 C.getBaseElementType(T)->getAs<RecordType>())
2656 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialDestructor();
2658 // TODO: Propagate nothrowness for implicitly declared special members.
2659 case UTT_HasNothrowAssign:
2660 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2661 // If type is const qualified or is a reference type then the
2662 // trait is false. Otherwise if __has_trivial_assign (type)
2663 // is true then the trait is true, else if type is a cv class
2664 // or union type with copy assignment operators that are known
2665 // not to throw an exception then the trait is true, else it is
2667 if (C.getBaseElementType(T).isConstQualified())
2669 if (T->isReferenceType())
2673 if (const RecordType *RT = T->getAs<RecordType>()) {
2674 CXXRecordDecl* RD = cast<CXXRecordDecl>(RT->getDecl());
2675 if (RD->hasTrivialCopyAssignment())
2678 bool FoundAssign = false;
2679 DeclarationName Name = C.DeclarationNames.getCXXOperatorName(OO_Equal);
2680 LookupResult Res(Self, DeclarationNameInfo(Name, KeyLoc),
2681 Sema::LookupOrdinaryName);
2682 if (Self.LookupQualifiedName(Res, RD)) {
2683 for (LookupResult::iterator Op = Res.begin(), OpEnd = Res.end();
2684 Op != OpEnd; ++Op) {
2685 CXXMethodDecl *Operator = cast<CXXMethodDecl>(*Op);
2686 if (Operator->isCopyAssignmentOperator()) {
2688 const FunctionProtoType *CPT
2689 = Operator->getType()->getAs<FunctionProtoType>();
2690 if (CPT->getExceptionSpecType() == EST_Delayed)
2692 if (!CPT->isNothrow(Self.Context))
2701 case UTT_HasNothrowCopy:
2702 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2703 // If __has_trivial_copy (type) is true then the trait is true, else
2704 // if type is a cv class or union type with copy constructors that are
2705 // known not to throw an exception then the trait is true, else it is
2707 if (T->isPODType() || T->isReferenceType())
2709 if (const RecordType *RT = T->getAs<RecordType>()) {
2710 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
2711 if (RD->hasTrivialCopyConstructor())
2714 bool FoundConstructor = false;
2716 DeclContext::lookup_const_iterator Con, ConEnd;
2717 for (llvm::tie(Con, ConEnd) = Self.LookupConstructors(RD);
2718 Con != ConEnd; ++Con) {
2719 // A template constructor is never a copy constructor.
2720 // FIXME: However, it may actually be selected at the actual overload
2721 // resolution point.
2722 if (isa<FunctionTemplateDecl>(*Con))
2724 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con);
2725 if (Constructor->isCopyConstructor(FoundTQs)) {
2726 FoundConstructor = true;
2727 const FunctionProtoType *CPT
2728 = Constructor->getType()->getAs<FunctionProtoType>();
2729 if (CPT->getExceptionSpecType() == EST_Delayed)
2731 // FIXME: check whether evaluating default arguments can throw.
2732 // For now, we'll be conservative and assume that they can throw.
2733 if (!CPT->isNothrow(Self.Context) || CPT->getNumArgs() > 1)
2738 return FoundConstructor;
2741 case UTT_HasNothrowConstructor:
2742 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2743 // If __has_trivial_constructor (type) is true then the trait is
2744 // true, else if type is a cv class or union type (or array
2745 // thereof) with a default constructor that is known not to
2746 // throw an exception then the trait is true, else it is false.
2749 if (const RecordType *RT = C.getBaseElementType(T)->getAs<RecordType>()) {
2750 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
2751 if (RD->hasTrivialDefaultConstructor())
2754 DeclContext::lookup_const_iterator Con, ConEnd;
2755 for (llvm::tie(Con, ConEnd) = Self.LookupConstructors(RD);
2756 Con != ConEnd; ++Con) {
2757 // FIXME: In C++0x, a constructor template can be a default constructor.
2758 if (isa<FunctionTemplateDecl>(*Con))
2760 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con);
2761 if (Constructor->isDefaultConstructor()) {
2762 const FunctionProtoType *CPT
2763 = Constructor->getType()->getAs<FunctionProtoType>();
2764 if (CPT->getExceptionSpecType() == EST_Delayed)
2766 // TODO: check whether evaluating default arguments can throw.
2767 // For now, we'll be conservative and assume that they can throw.
2768 return CPT->isNothrow(Self.Context) && CPT->getNumArgs() == 0;
2773 case UTT_HasVirtualDestructor:
2774 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
2775 // If type is a class type with a virtual destructor ([class.dtor])
2776 // then the trait is true, else it is false.
2777 if (const RecordType *Record = T->getAs<RecordType>()) {
2778 CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
2779 if (CXXDestructorDecl *Destructor = Self.LookupDestructor(RD))
2780 return Destructor->isVirtual();
2784 // These type trait expressions are modeled on the specifications for the
2785 // Embarcadero C++0x type trait functions:
2786 // http://docwiki.embarcadero.com/RADStudio/XE/en/Type_Trait_Functions_(C%2B%2B0x)_Index
2787 case UTT_IsCompleteType:
2788 // http://docwiki.embarcadero.com/RADStudio/XE/en/Is_complete_type_(typename_T_):
2789 // Returns True if and only if T is a complete type at the point of the
2791 return !T->isIncompleteType();
2793 llvm_unreachable("Type trait not covered by switch");
2796 ExprResult Sema::BuildUnaryTypeTrait(UnaryTypeTrait UTT,
2797 SourceLocation KWLoc,
2798 TypeSourceInfo *TSInfo,
2799 SourceLocation RParen) {
2800 QualType T = TSInfo->getType();
2801 if (!CheckUnaryTypeTraitTypeCompleteness(*this, UTT, KWLoc, T))
2805 if (!T->isDependentType())
2806 Value = EvaluateUnaryTypeTrait(*this, UTT, KWLoc, T);
2808 return Owned(new (Context) UnaryTypeTraitExpr(KWLoc, UTT, TSInfo, Value,
2809 RParen, Context.BoolTy));
2812 ExprResult Sema::ActOnBinaryTypeTrait(BinaryTypeTrait BTT,
2813 SourceLocation KWLoc,
2816 SourceLocation RParen) {
2817 TypeSourceInfo *LhsTSInfo;
2818 QualType LhsT = GetTypeFromParser(LhsTy, &LhsTSInfo);
2820 LhsTSInfo = Context.getTrivialTypeSourceInfo(LhsT);
2822 TypeSourceInfo *RhsTSInfo;
2823 QualType RhsT = GetTypeFromParser(RhsTy, &RhsTSInfo);
2825 RhsTSInfo = Context.getTrivialTypeSourceInfo(RhsT);
2827 return BuildBinaryTypeTrait(BTT, KWLoc, LhsTSInfo, RhsTSInfo, RParen);
2830 static bool EvaluateBinaryTypeTrait(Sema &Self, BinaryTypeTrait BTT,
2831 QualType LhsT, QualType RhsT,
2832 SourceLocation KeyLoc) {
2833 assert(!LhsT->isDependentType() && !RhsT->isDependentType() &&
2834 "Cannot evaluate traits of dependent types");
2837 case BTT_IsBaseOf: {
2838 // C++0x [meta.rel]p2
2839 // Base is a base class of Derived without regard to cv-qualifiers or
2840 // Base and Derived are not unions and name the same class type without
2841 // regard to cv-qualifiers.
2843 const RecordType *lhsRecord = LhsT->getAs<RecordType>();
2844 if (!lhsRecord) return false;
2846 const RecordType *rhsRecord = RhsT->getAs<RecordType>();
2847 if (!rhsRecord) return false;
2849 assert(Self.Context.hasSameUnqualifiedType(LhsT, RhsT)
2850 == (lhsRecord == rhsRecord));
2852 if (lhsRecord == rhsRecord)
2853 return !lhsRecord->getDecl()->isUnion();
2855 // C++0x [meta.rel]p2:
2856 // If Base and Derived are class types and are different types
2857 // (ignoring possible cv-qualifiers) then Derived shall be a
2859 if (Self.RequireCompleteType(KeyLoc, RhsT,
2860 diag::err_incomplete_type_used_in_type_trait_expr))
2863 return cast<CXXRecordDecl>(rhsRecord->getDecl())
2864 ->isDerivedFrom(cast<CXXRecordDecl>(lhsRecord->getDecl()));
2867 return Self.Context.hasSameType(LhsT, RhsT);
2868 case BTT_TypeCompatible:
2869 return Self.Context.typesAreCompatible(LhsT.getUnqualifiedType(),
2870 RhsT.getUnqualifiedType());
2871 case BTT_IsConvertible:
2872 case BTT_IsConvertibleTo: {
2873 // C++0x [meta.rel]p4:
2874 // Given the following function prototype:
2876 // template <class T>
2877 // typename add_rvalue_reference<T>::type create();
2879 // the predicate condition for a template specialization
2880 // is_convertible<From, To> shall be satisfied if and only if
2881 // the return expression in the following code would be
2882 // well-formed, including any implicit conversions to the return
2883 // type of the function:
2886 // return create<From>();
2889 // Access checking is performed as if in a context unrelated to To and
2890 // From. Only the validity of the immediate context of the expression
2891 // of the return-statement (including conversions to the return type)
2894 // We model the initialization as a copy-initialization of a temporary
2895 // of the appropriate type, which for this expression is identical to the
2896 // return statement (since NRVO doesn't apply).
2897 if (LhsT->isObjectType() || LhsT->isFunctionType())
2898 LhsT = Self.Context.getRValueReferenceType(LhsT);
2900 InitializedEntity To(InitializedEntity::InitializeTemporary(RhsT));
2901 OpaqueValueExpr From(KeyLoc, LhsT.getNonLValueExprType(Self.Context),
2902 Expr::getValueKindForType(LhsT));
2903 Expr *FromPtr = &From;
2904 InitializationKind Kind(InitializationKind::CreateCopy(KeyLoc,
2907 // Perform the initialization within a SFINAE trap at translation unit
2909 Sema::SFINAETrap SFINAE(Self, /*AccessCheckingSFINAE=*/true);
2910 Sema::ContextRAII TUContext(Self, Self.Context.getTranslationUnitDecl());
2911 InitializationSequence Init(Self, To, Kind, &FromPtr, 1);
2915 ExprResult Result = Init.Perform(Self, To, Kind, MultiExprArg(&FromPtr, 1));
2916 return !Result.isInvalid() && !SFINAE.hasErrorOccurred();
2919 llvm_unreachable("Unknown type trait or not implemented");
2922 ExprResult Sema::BuildBinaryTypeTrait(BinaryTypeTrait BTT,
2923 SourceLocation KWLoc,
2924 TypeSourceInfo *LhsTSInfo,
2925 TypeSourceInfo *RhsTSInfo,
2926 SourceLocation RParen) {
2927 QualType LhsT = LhsTSInfo->getType();
2928 QualType RhsT = RhsTSInfo->getType();
2930 if (BTT == BTT_TypeCompatible) {
2931 if (getLangOptions().CPlusPlus) {
2932 Diag(KWLoc, diag::err_types_compatible_p_in_cplusplus)
2933 << SourceRange(KWLoc, RParen);
2939 if (!LhsT->isDependentType() && !RhsT->isDependentType())
2940 Value = EvaluateBinaryTypeTrait(*this, BTT, LhsT, RhsT, KWLoc);
2942 // Select trait result type.
2943 QualType ResultType;
2945 case BTT_IsBaseOf: ResultType = Context.BoolTy; break;
2946 case BTT_IsConvertible: ResultType = Context.BoolTy; break;
2947 case BTT_IsSame: ResultType = Context.BoolTy; break;
2948 case BTT_TypeCompatible: ResultType = Context.IntTy; break;
2949 case BTT_IsConvertibleTo: ResultType = Context.BoolTy; break;
2952 return Owned(new (Context) BinaryTypeTraitExpr(KWLoc, BTT, LhsTSInfo,
2953 RhsTSInfo, Value, RParen,
2957 ExprResult Sema::ActOnArrayTypeTrait(ArrayTypeTrait ATT,
2958 SourceLocation KWLoc,
2961 SourceLocation RParen) {
2962 TypeSourceInfo *TSInfo;
2963 QualType T = GetTypeFromParser(Ty, &TSInfo);
2965 TSInfo = Context.getTrivialTypeSourceInfo(T);
2967 return BuildArrayTypeTrait(ATT, KWLoc, TSInfo, DimExpr, RParen);
2970 static uint64_t EvaluateArrayTypeTrait(Sema &Self, ArrayTypeTrait ATT,
2971 QualType T, Expr *DimExpr,
2972 SourceLocation KeyLoc) {
2973 assert(!T->isDependentType() && "Cannot evaluate traits of dependent type");
2977 if (T->isArrayType()) {
2979 while (const ArrayType *AT = Self.Context.getAsArrayType(T)) {
2981 T = AT->getElementType();
2987 case ATT_ArrayExtent: {
2990 if (DimExpr->isIntegerConstantExpr(Value, Self.Context, 0, false)) {
2991 if (Value < llvm::APSInt(Value.getBitWidth(), Value.isUnsigned())) {
2992 Self.Diag(KeyLoc, diag::err_dimension_expr_not_constant_integer) <<
2993 DimExpr->getSourceRange();
2996 Dim = Value.getLimitedValue();
2998 Self.Diag(KeyLoc, diag::err_dimension_expr_not_constant_integer) <<
2999 DimExpr->getSourceRange();
3003 if (T->isArrayType()) {
3005 bool Matched = false;
3006 while (const ArrayType *AT = Self.Context.getAsArrayType(T)) {
3012 T = AT->getElementType();
3015 if (Matched && T->isArrayType()) {
3016 if (const ConstantArrayType *CAT = Self.Context.getAsConstantArrayType(T))
3017 return CAT->getSize().getLimitedValue();
3023 llvm_unreachable("Unknown type trait or not implemented");
3026 ExprResult Sema::BuildArrayTypeTrait(ArrayTypeTrait ATT,
3027 SourceLocation KWLoc,
3028 TypeSourceInfo *TSInfo,
3030 SourceLocation RParen) {
3031 QualType T = TSInfo->getType();
3033 // FIXME: This should likely be tracked as an APInt to remove any host
3034 // assumptions about the width of size_t on the target.
3036 if (!T->isDependentType())
3037 Value = EvaluateArrayTypeTrait(*this, ATT, T, DimExpr, KWLoc);
3039 // While the specification for these traits from the Embarcadero C++
3040 // compiler's documentation says the return type is 'unsigned int', Clang
3041 // returns 'size_t'. On Windows, the primary platform for the Embarcadero
3042 // compiler, there is no difference. On several other platforms this is an
3043 // important distinction.
3044 return Owned(new (Context) ArrayTypeTraitExpr(KWLoc, ATT, TSInfo, Value,
3046 Context.getSizeType()));
3049 ExprResult Sema::ActOnExpressionTrait(ExpressionTrait ET,
3050 SourceLocation KWLoc,
3052 SourceLocation RParen) {
3053 // If error parsing the expression, ignore.
3057 ExprResult Result = BuildExpressionTrait(ET, KWLoc, Queried, RParen);
3059 return move(Result);
3062 static bool EvaluateExpressionTrait(ExpressionTrait ET, Expr *E) {
3064 case ET_IsLValueExpr: return E->isLValue();
3065 case ET_IsRValueExpr: return E->isRValue();
3067 llvm_unreachable("Expression trait not covered by switch");
3070 ExprResult Sema::BuildExpressionTrait(ExpressionTrait ET,
3071 SourceLocation KWLoc,
3073 SourceLocation RParen) {
3074 if (Queried->isTypeDependent()) {
3075 // Delay type-checking for type-dependent expressions.
3076 } else if (Queried->getType()->isPlaceholderType()) {
3077 ExprResult PE = CheckPlaceholderExpr(Queried);
3078 if (PE.isInvalid()) return ExprError();
3079 return BuildExpressionTrait(ET, KWLoc, PE.take(), RParen);
3082 bool Value = EvaluateExpressionTrait(ET, Queried);
3084 return Owned(new (Context) ExpressionTraitExpr(KWLoc, ET, Queried, Value,
3085 RParen, Context.BoolTy));
3088 QualType Sema::CheckPointerToMemberOperands(ExprResult &lex, ExprResult &rex,
3092 const char *OpSpelling = isIndirect ? "->*" : ".*";
3094 // The binary operator .* [p3: ->*] binds its second operand, which shall
3095 // be of type "pointer to member of T" (where T is a completely-defined
3096 // class type) [...]
3097 QualType RType = rex.get()->getType();
3098 const MemberPointerType *MemPtr = RType->getAs<MemberPointerType>();
3100 Diag(Loc, diag::err_bad_memptr_rhs)
3101 << OpSpelling << RType << rex.get()->getSourceRange();
3105 QualType Class(MemPtr->getClass(), 0);
3107 // Note: C++ [expr.mptr.oper]p2-3 says that the class type into which the
3108 // member pointer points must be completely-defined. However, there is no
3109 // reason for this semantic distinction, and the rule is not enforced by
3110 // other compilers. Therefore, we do not check this property, as it is
3111 // likely to be considered a defect.
3114 // [...] to its first operand, which shall be of class T or of a class of
3115 // which T is an unambiguous and accessible base class. [p3: a pointer to
3117 QualType LType = lex.get()->getType();
3119 if (const PointerType *Ptr = LType->getAs<PointerType>())
3120 LType = Ptr->getPointeeType();
3122 Diag(Loc, diag::err_bad_memptr_lhs)
3123 << OpSpelling << 1 << LType
3124 << FixItHint::CreateReplacement(SourceRange(Loc), ".*");
3129 if (!Context.hasSameUnqualifiedType(Class, LType)) {
3130 // If we want to check the hierarchy, we need a complete type.
3131 if (RequireCompleteType(Loc, LType, PDiag(diag::err_bad_memptr_lhs)
3132 << OpSpelling << (int)isIndirect)) {
3135 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
3136 /*DetectVirtual=*/false);
3137 // FIXME: Would it be useful to print full ambiguity paths, or is that
3139 if (!IsDerivedFrom(LType, Class, Paths) ||
3140 Paths.isAmbiguous(Context.getCanonicalType(Class))) {
3141 Diag(Loc, diag::err_bad_memptr_lhs) << OpSpelling
3142 << (int)isIndirect << lex.get()->getType();
3145 // Cast LHS to type of use.
3146 QualType UseType = isIndirect ? Context.getPointerType(Class) : Class;
3148 isIndirect ? VK_RValue : CastCategory(lex.get());
3150 CXXCastPath BasePath;
3151 BuildBasePathArray(Paths, BasePath);
3152 lex = ImpCastExprToType(lex.take(), UseType, CK_DerivedToBase, VK, &BasePath);
3155 if (isa<CXXScalarValueInitExpr>(rex.get()->IgnoreParens())) {
3156 // Diagnose use of pointer-to-member type which when used as
3157 // the functional cast in a pointer-to-member expression.
3158 Diag(Loc, diag::err_pointer_to_member_type) << isIndirect;
3163 // The result is an object or a function of the type specified by the
3165 // The cv qualifiers are the union of those in the pointer and the left side,
3166 // in accordance with 5.5p5 and 5.2.5.
3167 QualType Result = MemPtr->getPointeeType();
3168 Result = Context.getCVRQualifiedType(Result, LType.getCVRQualifiers());
3170 // C++0x [expr.mptr.oper]p6:
3171 // In a .* expression whose object expression is an rvalue, the program is
3172 // ill-formed if the second operand is a pointer to member function with
3173 // ref-qualifier &. In a ->* expression or in a .* expression whose object
3174 // expression is an lvalue, the program is ill-formed if the second operand
3175 // is a pointer to member function with ref-qualifier &&.
3176 if (const FunctionProtoType *Proto = Result->getAs<FunctionProtoType>()) {
3177 switch (Proto->getRefQualifier()) {
3183 if (!isIndirect && !lex.get()->Classify(Context).isLValue())
3184 Diag(Loc, diag::err_pointer_to_member_oper_value_classify)
3185 << RType << 1 << lex.get()->getSourceRange();
3189 if (isIndirect || !lex.get()->Classify(Context).isRValue())
3190 Diag(Loc, diag::err_pointer_to_member_oper_value_classify)
3191 << RType << 0 << lex.get()->getSourceRange();
3196 // C++ [expr.mptr.oper]p6:
3197 // The result of a .* expression whose second operand is a pointer
3198 // to a data member is of the same value category as its
3199 // first operand. The result of a .* expression whose second
3200 // operand is a pointer to a member function is a prvalue. The
3201 // result of an ->* expression is an lvalue if its second operand
3202 // is a pointer to data member and a prvalue otherwise.
3203 if (Result->isFunctionType()) {
3205 return Context.BoundMemberTy;
3206 } else if (isIndirect) {
3209 VK = lex.get()->getValueKind();
3215 /// \brief Try to convert a type to another according to C++0x 5.16p3.
3217 /// This is part of the parameter validation for the ? operator. If either
3218 /// value operand is a class type, the two operands are attempted to be
3219 /// converted to each other. This function does the conversion in one direction.
3220 /// It returns true if the program is ill-formed and has already been diagnosed
3222 static bool TryClassUnification(Sema &Self, Expr *From, Expr *To,
3223 SourceLocation QuestionLoc,
3224 bool &HaveConversion,
3226 HaveConversion = false;
3227 ToType = To->getType();
3229 InitializationKind Kind = InitializationKind::CreateCopy(To->getLocStart(),
3232 // The process for determining whether an operand expression E1 of type T1
3233 // can be converted to match an operand expression E2 of type T2 is defined
3235 // -- If E2 is an lvalue:
3236 bool ToIsLvalue = To->isLValue();
3238 // E1 can be converted to match E2 if E1 can be implicitly converted to
3239 // type "lvalue reference to T2", subject to the constraint that in the
3240 // conversion the reference must bind directly to E1.
3241 QualType T = Self.Context.getLValueReferenceType(ToType);
3242 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T);
3244 InitializationSequence InitSeq(Self, Entity, Kind, &From, 1);
3245 if (InitSeq.isDirectReferenceBinding()) {
3247 HaveConversion = true;
3251 if (InitSeq.isAmbiguous())
3252 return InitSeq.Diagnose(Self, Entity, Kind, &From, 1);
3255 // -- If E2 is an rvalue, or if the conversion above cannot be done:
3256 // -- if E1 and E2 have class type, and the underlying class types are
3257 // the same or one is a base class of the other:
3258 QualType FTy = From->getType();
3259 QualType TTy = To->getType();
3260 const RecordType *FRec = FTy->getAs<RecordType>();
3261 const RecordType *TRec = TTy->getAs<RecordType>();
3262 bool FDerivedFromT = FRec && TRec && FRec != TRec &&
3263 Self.IsDerivedFrom(FTy, TTy);
3265 (FRec == TRec || FDerivedFromT || Self.IsDerivedFrom(TTy, FTy))) {
3266 // E1 can be converted to match E2 if the class of T2 is the
3267 // same type as, or a base class of, the class of T1, and
3269 if (FRec == TRec || FDerivedFromT) {
3270 if (TTy.isAtLeastAsQualifiedAs(FTy)) {
3271 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy);
3272 InitializationSequence InitSeq(Self, Entity, Kind, &From, 1);
3274 HaveConversion = true;
3278 if (InitSeq.isAmbiguous())
3279 return InitSeq.Diagnose(Self, Entity, Kind, &From, 1);
3286 // -- Otherwise: E1 can be converted to match E2 if E1 can be
3287 // implicitly converted to the type that expression E2 would have
3288 // if E2 were converted to an rvalue (or the type it has, if E2 is
3291 // This actually refers very narrowly to the lvalue-to-rvalue conversion, not
3292 // to the array-to-pointer or function-to-pointer conversions.
3293 if (!TTy->getAs<TagType>())
3294 TTy = TTy.getUnqualifiedType();
3296 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy);
3297 InitializationSequence InitSeq(Self, Entity, Kind, &From, 1);
3298 HaveConversion = !InitSeq.Failed();
3300 if (InitSeq.isAmbiguous())
3301 return InitSeq.Diagnose(Self, Entity, Kind, &From, 1);
3306 /// \brief Try to find a common type for two according to C++0x 5.16p5.
3308 /// This is part of the parameter validation for the ? operator. If either
3309 /// value operand is a class type, overload resolution is used to find a
3310 /// conversion to a common type.
3311 static bool FindConditionalOverload(Sema &Self, ExprResult &LHS, ExprResult &RHS,
3312 SourceLocation QuestionLoc) {
3313 Expr *Args[2] = { LHS.get(), RHS.get() };
3314 OverloadCandidateSet CandidateSet(QuestionLoc);
3315 Self.AddBuiltinOperatorCandidates(OO_Conditional, QuestionLoc, Args, 2,
3318 OverloadCandidateSet::iterator Best;
3319 switch (CandidateSet.BestViableFunction(Self, QuestionLoc, Best)) {
3321 // We found a match. Perform the conversions on the arguments and move on.
3323 Self.PerformImplicitConversion(LHS.get(), Best->BuiltinTypes.ParamTypes[0],
3324 Best->Conversions[0], Sema::AA_Converting);
3325 if (LHSRes.isInvalid())
3330 Self.PerformImplicitConversion(RHS.get(), Best->BuiltinTypes.ParamTypes[1],
3331 Best->Conversions[1], Sema::AA_Converting);
3332 if (RHSRes.isInvalid())
3336 Self.MarkDeclarationReferenced(QuestionLoc, Best->Function);
3340 case OR_No_Viable_Function:
3342 // Emit a better diagnostic if one of the expressions is a null pointer
3343 // constant and the other is a pointer type. In this case, the user most
3344 // likely forgot to take the address of the other expression.
3345 if (Self.DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
3348 Self.Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
3349 << LHS.get()->getType() << RHS.get()->getType()
3350 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
3354 Self.Diag(QuestionLoc, diag::err_conditional_ambiguous_ovl)
3355 << LHS.get()->getType() << RHS.get()->getType()
3356 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
3357 // FIXME: Print the possible common types by printing the return types of
3358 // the viable candidates.
3362 assert(false && "Conditional operator has only built-in overloads");
3368 /// \brief Perform an "extended" implicit conversion as returned by
3369 /// TryClassUnification.
3370 static bool ConvertForConditional(Sema &Self, ExprResult &E, QualType T) {
3371 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T);
3372 InitializationKind Kind = InitializationKind::CreateCopy(E.get()->getLocStart(),
3374 Expr *Arg = E.take();
3375 InitializationSequence InitSeq(Self, Entity, Kind, &Arg, 1);
3376 ExprResult Result = InitSeq.Perform(Self, Entity, Kind, MultiExprArg(&Arg, 1));
3377 if (Result.isInvalid())
3384 /// \brief Check the operands of ?: under C++ semantics.
3386 /// See C++ [expr.cond]. Note that LHS is never null, even for the GNU x ?: y
3387 /// extension. In this case, LHS == Cond. (But they're not aliases.)
3388 QualType Sema::CXXCheckConditionalOperands(ExprResult &Cond, ExprResult &LHS, ExprResult &RHS,
3389 ExprValueKind &VK, ExprObjectKind &OK,
3390 SourceLocation QuestionLoc) {
3391 // FIXME: Handle C99's complex types, vector types, block pointers and Obj-C++
3392 // interface pointers.
3395 // The first expression is contextually converted to bool.
3396 if (!Cond.get()->isTypeDependent()) {
3397 ExprResult CondRes = CheckCXXBooleanCondition(Cond.take());
3398 if (CondRes.isInvalid())
3400 Cond = move(CondRes);
3407 // Either of the arguments dependent?
3408 if (LHS.get()->isTypeDependent() || RHS.get()->isTypeDependent())
3409 return Context.DependentTy;
3412 // If either the second or the third operand has type (cv) void, ...
3413 QualType LTy = LHS.get()->getType();
3414 QualType RTy = RHS.get()->getType();
3415 bool LVoid = LTy->isVoidType();
3416 bool RVoid = RTy->isVoidType();
3417 if (LVoid || RVoid) {
3418 // ... then the [l2r] conversions are performed on the second and third
3420 LHS = DefaultFunctionArrayLvalueConversion(LHS.take());
3421 RHS = DefaultFunctionArrayLvalueConversion(RHS.take());
3422 if (LHS.isInvalid() || RHS.isInvalid())
3424 LTy = LHS.get()->getType();
3425 RTy = RHS.get()->getType();
3427 // ... and one of the following shall hold:
3428 // -- The second or the third operand (but not both) is a throw-
3429 // expression; the result is of the type of the other and is an rvalue.
3430 bool LThrow = isa<CXXThrowExpr>(LHS.get());
3431 bool RThrow = isa<CXXThrowExpr>(RHS.get());
3432 if (LThrow && !RThrow)
3434 if (RThrow && !LThrow)
3437 // -- Both the second and third operands have type void; the result is of
3438 // type void and is an rvalue.
3440 return Context.VoidTy;
3442 // Neither holds, error.
3443 Diag(QuestionLoc, diag::err_conditional_void_nonvoid)
3444 << (LVoid ? RTy : LTy) << (LVoid ? 0 : 1)
3445 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
3452 // Otherwise, if the second and third operand have different types, and
3453 // either has (cv) class type, and attempt is made to convert each of those
3454 // operands to the other.
3455 if (!Context.hasSameType(LTy, RTy) &&
3456 (LTy->isRecordType() || RTy->isRecordType())) {
3457 ImplicitConversionSequence ICSLeftToRight, ICSRightToLeft;
3458 // These return true if a single direction is already ambiguous.
3459 QualType L2RType, R2LType;
3460 bool HaveL2R, HaveR2L;
3461 if (TryClassUnification(*this, LHS.get(), RHS.get(), QuestionLoc, HaveL2R, L2RType))
3463 if (TryClassUnification(*this, RHS.get(), LHS.get(), QuestionLoc, HaveR2L, R2LType))
3466 // If both can be converted, [...] the program is ill-formed.
3467 if (HaveL2R && HaveR2L) {
3468 Diag(QuestionLoc, diag::err_conditional_ambiguous)
3469 << LTy << RTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
3473 // If exactly one conversion is possible, that conversion is applied to
3474 // the chosen operand and the converted operands are used in place of the
3475 // original operands for the remainder of this section.
3477 if (ConvertForConditional(*this, LHS, L2RType) || LHS.isInvalid())
3479 LTy = LHS.get()->getType();
3480 } else if (HaveR2L) {
3481 if (ConvertForConditional(*this, RHS, R2LType) || RHS.isInvalid())
3483 RTy = RHS.get()->getType();
3488 // If the second and third operands are glvalues of the same value
3489 // category and have the same type, the result is of that type and
3490 // value category and it is a bit-field if the second or the third
3491 // operand is a bit-field, or if both are bit-fields.
3492 // We only extend this to bitfields, not to the crazy other kinds of
3494 bool Same = Context.hasSameType(LTy, RTy);
3496 LHS.get()->isGLValue() &&
3497 LHS.get()->getValueKind() == RHS.get()->getValueKind() &&
3498 LHS.get()->isOrdinaryOrBitFieldObject() &&
3499 RHS.get()->isOrdinaryOrBitFieldObject()) {
3500 VK = LHS.get()->getValueKind();
3501 if (LHS.get()->getObjectKind() == OK_BitField ||
3502 RHS.get()->getObjectKind() == OK_BitField)
3508 // Otherwise, the result is an rvalue. If the second and third operands
3509 // do not have the same type, and either has (cv) class type, ...
3510 if (!Same && (LTy->isRecordType() || RTy->isRecordType())) {
3511 // ... overload resolution is used to determine the conversions (if any)
3512 // to be applied to the operands. If the overload resolution fails, the
3513 // program is ill-formed.
3514 if (FindConditionalOverload(*this, LHS, RHS, QuestionLoc))
3519 // LValue-to-rvalue, array-to-pointer, and function-to-pointer standard
3520 // conversions are performed on the second and third operands.
3521 LHS = DefaultFunctionArrayLvalueConversion(LHS.take());
3522 RHS = DefaultFunctionArrayLvalueConversion(RHS.take());
3523 if (LHS.isInvalid() || RHS.isInvalid())
3525 LTy = LHS.get()->getType();
3526 RTy = RHS.get()->getType();
3528 // After those conversions, one of the following shall hold:
3529 // -- The second and third operands have the same type; the result
3530 // is of that type. If the operands have class type, the result
3531 // is a prvalue temporary of the result type, which is
3532 // copy-initialized from either the second operand or the third
3533 // operand depending on the value of the first operand.
3534 if (Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy)) {
3535 if (LTy->isRecordType()) {
3536 // The operands have class type. Make a temporary copy.
3537 InitializedEntity Entity = InitializedEntity::InitializeTemporary(LTy);
3538 ExprResult LHSCopy = PerformCopyInitialization(Entity,
3541 if (LHSCopy.isInvalid())
3544 ExprResult RHSCopy = PerformCopyInitialization(Entity,
3547 if (RHSCopy.isInvalid())
3557 // Extension: conditional operator involving vector types.
3558 if (LTy->isVectorType() || RTy->isVectorType())
3559 return CheckVectorOperands(QuestionLoc, LHS, RHS);
3561 // -- The second and third operands have arithmetic or enumeration type;
3562 // the usual arithmetic conversions are performed to bring them to a
3563 // common type, and the result is of that type.
3564 if (LTy->isArithmeticType() && RTy->isArithmeticType()) {
3565 UsualArithmeticConversions(LHS, RHS);
3566 if (LHS.isInvalid() || RHS.isInvalid())
3568 return LHS.get()->getType();
3571 // -- The second and third operands have pointer type, or one has pointer
3572 // type and the other is a null pointer constant; pointer conversions
3573 // and qualification conversions are performed to bring them to their
3574 // composite pointer type. The result is of the composite pointer type.
3575 // -- The second and third operands have pointer to member type, or one has
3576 // pointer to member type and the other is a null pointer constant;
3577 // pointer to member conversions and qualification conversions are
3578 // performed to bring them to a common type, whose cv-qualification
3579 // shall match the cv-qualification of either the second or the third
3580 // operand. The result is of the common type.
3581 bool NonStandardCompositeType = false;
3582 QualType Composite = FindCompositePointerType(QuestionLoc, LHS, RHS,
3583 isSFINAEContext()? 0 : &NonStandardCompositeType);
3584 if (!Composite.isNull()) {
3585 if (NonStandardCompositeType)
3587 diag::ext_typecheck_cond_incompatible_operands_nonstandard)
3588 << LTy << RTy << Composite
3589 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
3594 // Similarly, attempt to find composite type of two objective-c pointers.
3595 Composite = FindCompositeObjCPointerType(LHS, RHS, QuestionLoc);
3596 if (!Composite.isNull())
3599 // Check if we are using a null with a non-pointer type.
3600 if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
3603 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
3604 << LHS.get()->getType() << RHS.get()->getType()
3605 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
3609 /// \brief Find a merged pointer type and convert the two expressions to it.
3611 /// This finds the composite pointer type (or member pointer type) for @p E1
3612 /// and @p E2 according to C++0x 5.9p2. It converts both expressions to this
3613 /// type and returns it.
3614 /// It does not emit diagnostics.
3616 /// \param Loc The location of the operator requiring these two expressions to
3617 /// be converted to the composite pointer type.
3619 /// If \p NonStandardCompositeType is non-NULL, then we are permitted to find
3620 /// a non-standard (but still sane) composite type to which both expressions
3621 /// can be converted. When such a type is chosen, \c *NonStandardCompositeType
3622 /// will be set true.
3623 QualType Sema::FindCompositePointerType(SourceLocation Loc,
3624 Expr *&E1, Expr *&E2,
3625 bool *NonStandardCompositeType) {
3626 if (NonStandardCompositeType)
3627 *NonStandardCompositeType = false;
3629 assert(getLangOptions().CPlusPlus && "This function assumes C++");
3630 QualType T1 = E1->getType(), T2 = E2->getType();
3632 if (!T1->isAnyPointerType() && !T1->isMemberPointerType() &&
3633 !T2->isAnyPointerType() && !T2->isMemberPointerType())
3637 // Pointer conversions and qualification conversions are performed on
3638 // pointer operands to bring them to their composite pointer type. If
3639 // one operand is a null pointer constant, the composite pointer type is
3640 // the type of the other operand.
3641 if (E1->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
3642 if (T2->isMemberPointerType())
3643 E1 = ImpCastExprToType(E1, T2, CK_NullToMemberPointer).take();
3645 E1 = ImpCastExprToType(E1, T2, CK_NullToPointer).take();
3648 if (E2->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
3649 if (T1->isMemberPointerType())
3650 E2 = ImpCastExprToType(E2, T1, CK_NullToMemberPointer).take();
3652 E2 = ImpCastExprToType(E2, T1, CK_NullToPointer).take();
3656 // Now both have to be pointers or member pointers.
3657 if ((!T1->isPointerType() && !T1->isMemberPointerType()) ||
3658 (!T2->isPointerType() && !T2->isMemberPointerType()))
3661 // Otherwise, of one of the operands has type "pointer to cv1 void," then
3662 // the other has type "pointer to cv2 T" and the composite pointer type is
3663 // "pointer to cv12 void," where cv12 is the union of cv1 and cv2.
3664 // Otherwise, the composite pointer type is a pointer type similar to the
3665 // type of one of the operands, with a cv-qualification signature that is
3666 // the union of the cv-qualification signatures of the operand types.
3667 // In practice, the first part here is redundant; it's subsumed by the second.
3668 // What we do here is, we build the two possible composite types, and try the
3669 // conversions in both directions. If only one works, or if the two composite
3670 // types are the same, we have succeeded.
3671 // FIXME: extended qualifiers?
3672 typedef llvm::SmallVector<unsigned, 4> QualifierVector;
3673 QualifierVector QualifierUnion;
3674 typedef llvm::SmallVector<std::pair<const Type *, const Type *>, 4>
3675 ContainingClassVector;
3676 ContainingClassVector MemberOfClass;
3677 QualType Composite1 = Context.getCanonicalType(T1),
3678 Composite2 = Context.getCanonicalType(T2);
3679 unsigned NeedConstBefore = 0;
3681 const PointerType *Ptr1, *Ptr2;
3682 if ((Ptr1 = Composite1->getAs<PointerType>()) &&
3683 (Ptr2 = Composite2->getAs<PointerType>())) {
3684 Composite1 = Ptr1->getPointeeType();
3685 Composite2 = Ptr2->getPointeeType();
3687 // If we're allowed to create a non-standard composite type, keep track
3688 // of where we need to fill in additional 'const' qualifiers.
3689 if (NonStandardCompositeType &&
3690 Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers())
3691 NeedConstBefore = QualifierUnion.size();
3693 QualifierUnion.push_back(
3694 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
3695 MemberOfClass.push_back(std::make_pair((const Type *)0, (const Type *)0));
3699 const MemberPointerType *MemPtr1, *MemPtr2;
3700 if ((MemPtr1 = Composite1->getAs<MemberPointerType>()) &&
3701 (MemPtr2 = Composite2->getAs<MemberPointerType>())) {
3702 Composite1 = MemPtr1->getPointeeType();
3703 Composite2 = MemPtr2->getPointeeType();
3705 // If we're allowed to create a non-standard composite type, keep track
3706 // of where we need to fill in additional 'const' qualifiers.
3707 if (NonStandardCompositeType &&
3708 Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers())
3709 NeedConstBefore = QualifierUnion.size();
3711 QualifierUnion.push_back(
3712 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
3713 MemberOfClass.push_back(std::make_pair(MemPtr1->getClass(),
3714 MemPtr2->getClass()));
3718 // FIXME: block pointer types?
3720 // Cannot unwrap any more types.
3724 if (NeedConstBefore && NonStandardCompositeType) {
3725 // Extension: Add 'const' to qualifiers that come before the first qualifier
3726 // mismatch, so that our (non-standard!) composite type meets the
3727 // requirements of C++ [conv.qual]p4 bullet 3.
3728 for (unsigned I = 0; I != NeedConstBefore; ++I) {
3729 if ((QualifierUnion[I] & Qualifiers::Const) == 0) {
3730 QualifierUnion[I] = QualifierUnion[I] | Qualifiers::Const;
3731 *NonStandardCompositeType = true;
3736 // Rewrap the composites as pointers or member pointers with the union CVRs.
3737 ContainingClassVector::reverse_iterator MOC
3738 = MemberOfClass.rbegin();
3739 for (QualifierVector::reverse_iterator
3740 I = QualifierUnion.rbegin(),
3741 E = QualifierUnion.rend();
3742 I != E; (void)++I, ++MOC) {
3743 Qualifiers Quals = Qualifiers::fromCVRMask(*I);
3744 if (MOC->first && MOC->second) {
3745 // Rebuild member pointer type
3746 Composite1 = Context.getMemberPointerType(
3747 Context.getQualifiedType(Composite1, Quals),
3749 Composite2 = Context.getMemberPointerType(
3750 Context.getQualifiedType(Composite2, Quals),
3753 // Rebuild pointer type
3755 = Context.getPointerType(Context.getQualifiedType(Composite1, Quals));
3757 = Context.getPointerType(Context.getQualifiedType(Composite2, Quals));
3761 // Try to convert to the first composite pointer type.
3762 InitializedEntity Entity1
3763 = InitializedEntity::InitializeTemporary(Composite1);
3764 InitializationKind Kind
3765 = InitializationKind::CreateCopy(Loc, SourceLocation());
3766 InitializationSequence E1ToC1(*this, Entity1, Kind, &E1, 1);
3767 InitializationSequence E2ToC1(*this, Entity1, Kind, &E2, 1);
3769 if (E1ToC1 && E2ToC1) {
3770 // Conversion to Composite1 is viable.
3771 if (!Context.hasSameType(Composite1, Composite2)) {
3772 // Composite2 is a different type from Composite1. Check whether
3773 // Composite2 is also viable.
3774 InitializedEntity Entity2
3775 = InitializedEntity::InitializeTemporary(Composite2);
3776 InitializationSequence E1ToC2(*this, Entity2, Kind, &E1, 1);
3777 InitializationSequence E2ToC2(*this, Entity2, Kind, &E2, 1);
3778 if (E1ToC2 && E2ToC2) {
3779 // Both Composite1 and Composite2 are viable and are different;
3780 // this is an ambiguity.
3785 // Convert E1 to Composite1
3787 = E1ToC1.Perform(*this, Entity1, Kind, MultiExprArg(*this,&E1,1));
3788 if (E1Result.isInvalid())
3790 E1 = E1Result.takeAs<Expr>();
3792 // Convert E2 to Composite1
3794 = E2ToC1.Perform(*this, Entity1, Kind, MultiExprArg(*this,&E2,1));
3795 if (E2Result.isInvalid())
3797 E2 = E2Result.takeAs<Expr>();
3802 // Check whether Composite2 is viable.
3803 InitializedEntity Entity2
3804 = InitializedEntity::InitializeTemporary(Composite2);
3805 InitializationSequence E1ToC2(*this, Entity2, Kind, &E1, 1);
3806 InitializationSequence E2ToC2(*this, Entity2, Kind, &E2, 1);
3807 if (!E1ToC2 || !E2ToC2)
3810 // Convert E1 to Composite2
3812 = E1ToC2.Perform(*this, Entity2, Kind, MultiExprArg(*this, &E1, 1));
3813 if (E1Result.isInvalid())
3815 E1 = E1Result.takeAs<Expr>();
3817 // Convert E2 to Composite2
3819 = E2ToC2.Perform(*this, Entity2, Kind, MultiExprArg(*this, &E2, 1));
3820 if (E2Result.isInvalid())
3822 E2 = E2Result.takeAs<Expr>();
3827 ExprResult Sema::MaybeBindToTemporary(Expr *E) {
3831 if (!Context.getLangOptions().CPlusPlus)
3834 assert(!isa<CXXBindTemporaryExpr>(E) && "Double-bound temporary?");
3836 const RecordType *RT = E->getType()->getAs<RecordType>();
3840 // If the result is a glvalue, we shouldn't bind it.
3841 if (E->Classify(Context).isGLValue())
3844 // That should be enough to guarantee that this type is complete.
3845 // If it has a trivial destructor, we can avoid the extra copy.
3846 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
3847 if (RD->isInvalidDecl() || RD->hasTrivialDestructor())
3850 CXXTemporary *Temp = CXXTemporary::Create(Context, LookupDestructor(RD));
3851 ExprTemporaries.push_back(Temp);
3852 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) {
3853 MarkDeclarationReferenced(E->getExprLoc(), Destructor);
3854 CheckDestructorAccess(E->getExprLoc(), Destructor,
3855 PDiag(diag::err_access_dtor_temp)
3858 // FIXME: Add the temporary to the temporaries vector.
3859 return Owned(CXXBindTemporaryExpr::Create(Context, Temp, E));
3862 Expr *Sema::MaybeCreateExprWithCleanups(Expr *SubExpr) {
3863 assert(SubExpr && "sub expression can't be null!");
3865 unsigned FirstTemporary = ExprEvalContexts.back().NumTemporaries;
3866 assert(ExprTemporaries.size() >= FirstTemporary);
3867 if (ExprTemporaries.size() == FirstTemporary)
3870 Expr *E = ExprWithCleanups::Create(Context, SubExpr,
3871 &ExprTemporaries[FirstTemporary],
3872 ExprTemporaries.size() - FirstTemporary);
3873 ExprTemporaries.erase(ExprTemporaries.begin() + FirstTemporary,
3874 ExprTemporaries.end());
3880 Sema::MaybeCreateExprWithCleanups(ExprResult SubExpr) {
3881 if (SubExpr.isInvalid())
3884 return Owned(MaybeCreateExprWithCleanups(SubExpr.take()));
3887 Stmt *Sema::MaybeCreateStmtWithCleanups(Stmt *SubStmt) {
3888 assert(SubStmt && "sub statement can't be null!");
3890 unsigned FirstTemporary = ExprEvalContexts.back().NumTemporaries;
3891 assert(ExprTemporaries.size() >= FirstTemporary);
3892 if (ExprTemporaries.size() == FirstTemporary)
3895 // FIXME: In order to attach the temporaries, wrap the statement into
3896 // a StmtExpr; currently this is only used for asm statements.
3897 // This is hacky, either create a new CXXStmtWithTemporaries statement or
3898 // a new AsmStmtWithTemporaries.
3899 CompoundStmt *CompStmt = new (Context) CompoundStmt(Context, &SubStmt, 1,
3902 Expr *E = new (Context) StmtExpr(CompStmt, Context.VoidTy, SourceLocation(),
3904 return MaybeCreateExprWithCleanups(E);
3908 Sema::ActOnStartCXXMemberReference(Scope *S, Expr *Base, SourceLocation OpLoc,
3909 tok::TokenKind OpKind, ParsedType &ObjectType,
3910 bool &MayBePseudoDestructor) {
3911 // Since this might be a postfix expression, get rid of ParenListExprs.
3912 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
3913 if (Result.isInvalid()) return ExprError();
3914 Base = Result.get();
3916 QualType BaseType = Base->getType();
3917 MayBePseudoDestructor = false;
3918 if (BaseType->isDependentType()) {
3919 // If we have a pointer to a dependent type and are using the -> operator,
3920 // the object type is the type that the pointer points to. We might still
3921 // have enough information about that type to do something useful.
3922 if (OpKind == tok::arrow)
3923 if (const PointerType *Ptr = BaseType->getAs<PointerType>())
3924 BaseType = Ptr->getPointeeType();
3926 ObjectType = ParsedType::make(BaseType);
3927 MayBePseudoDestructor = true;
3931 // C++ [over.match.oper]p8:
3932 // [...] When operator->returns, the operator-> is applied to the value
3933 // returned, with the original second operand.
3934 if (OpKind == tok::arrow) {
3935 // The set of types we've considered so far.
3936 llvm::SmallPtrSet<CanQualType,8> CTypes;
3937 llvm::SmallVector<SourceLocation, 8> Locations;
3938 CTypes.insert(Context.getCanonicalType(BaseType));
3940 while (BaseType->isRecordType()) {
3941 Result = BuildOverloadedArrowExpr(S, Base, OpLoc);
3942 if (Result.isInvalid())
3944 Base = Result.get();
3945 if (CXXOperatorCallExpr *OpCall = dyn_cast<CXXOperatorCallExpr>(Base))
3946 Locations.push_back(OpCall->getDirectCallee()->getLocation());
3947 BaseType = Base->getType();
3948 CanQualType CBaseType = Context.getCanonicalType(BaseType);
3949 if (!CTypes.insert(CBaseType)) {
3950 Diag(OpLoc, diag::err_operator_arrow_circular);
3951 for (unsigned i = 0; i < Locations.size(); i++)
3952 Diag(Locations[i], diag::note_declared_at);
3957 if (BaseType->isPointerType())
3958 BaseType = BaseType->getPointeeType();
3961 // We could end up with various non-record types here, such as extended
3962 // vector types or Objective-C interfaces. Just return early and let
3963 // ActOnMemberReferenceExpr do the work.
3964 if (!BaseType->isRecordType()) {
3965 // C++ [basic.lookup.classref]p2:
3966 // [...] If the type of the object expression is of pointer to scalar
3967 // type, the unqualified-id is looked up in the context of the complete
3968 // postfix-expression.
3970 // This also indicates that we should be parsing a
3971 // pseudo-destructor-name.
3972 ObjectType = ParsedType();
3973 MayBePseudoDestructor = true;
3977 // The object type must be complete (or dependent).
3978 if (!BaseType->isDependentType() &&
3979 RequireCompleteType(OpLoc, BaseType,
3980 PDiag(diag::err_incomplete_member_access)))
3983 // C++ [basic.lookup.classref]p2:
3984 // If the id-expression in a class member access (5.2.5) is an
3985 // unqualified-id, and the type of the object expression is of a class
3986 // type C (or of pointer to a class type C), the unqualified-id is looked
3987 // up in the scope of class C. [...]
3988 ObjectType = ParsedType::make(BaseType);
3992 ExprResult Sema::DiagnoseDtorReference(SourceLocation NameLoc,
3994 SourceLocation ExpectedLParenLoc = PP.getLocForEndOfToken(NameLoc);
3995 Diag(MemExpr->getLocStart(), diag::err_dtor_expr_without_call)
3996 << isa<CXXPseudoDestructorExpr>(MemExpr)
3997 << FixItHint::CreateInsertion(ExpectedLParenLoc, "()");
3999 return ActOnCallExpr(/*Scope*/ 0,
4001 /*LPLoc*/ ExpectedLParenLoc,
4003 /*RPLoc*/ ExpectedLParenLoc);
4006 ExprResult Sema::BuildPseudoDestructorExpr(Expr *Base,
4007 SourceLocation OpLoc,
4008 tok::TokenKind OpKind,
4009 const CXXScopeSpec &SS,
4010 TypeSourceInfo *ScopeTypeInfo,
4011 SourceLocation CCLoc,
4012 SourceLocation TildeLoc,
4013 PseudoDestructorTypeStorage Destructed,
4014 bool HasTrailingLParen) {
4015 TypeSourceInfo *DestructedTypeInfo = Destructed.getTypeSourceInfo();
4017 // C++ [expr.pseudo]p2:
4018 // The left-hand side of the dot operator shall be of scalar type. The
4019 // left-hand side of the arrow operator shall be of pointer to scalar type.
4020 // This scalar type is the object type.
4021 QualType ObjectType = Base->getType();
4022 if (OpKind == tok::arrow) {
4023 if (const PointerType *Ptr = ObjectType->getAs<PointerType>()) {
4024 ObjectType = Ptr->getPointeeType();
4025 } else if (!Base->isTypeDependent()) {
4026 // The user wrote "p->" when she probably meant "p."; fix it.
4027 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
4028 << ObjectType << true
4029 << FixItHint::CreateReplacement(OpLoc, ".");
4030 if (isSFINAEContext())
4033 OpKind = tok::period;
4037 if (!ObjectType->isDependentType() && !ObjectType->isScalarType()) {
4038 Diag(OpLoc, diag::err_pseudo_dtor_base_not_scalar)
4039 << ObjectType << Base->getSourceRange();
4043 // C++ [expr.pseudo]p2:
4044 // [...] The cv-unqualified versions of the object type and of the type
4045 // designated by the pseudo-destructor-name shall be the same type.
4046 if (DestructedTypeInfo) {
4047 QualType DestructedType = DestructedTypeInfo->getType();
4048 SourceLocation DestructedTypeStart
4049 = DestructedTypeInfo->getTypeLoc().getLocalSourceRange().getBegin();
4050 if (!DestructedType->isDependentType() && !ObjectType->isDependentType() &&
4051 !Context.hasSameUnqualifiedType(DestructedType, ObjectType)) {
4052 Diag(DestructedTypeStart, diag::err_pseudo_dtor_type_mismatch)
4053 << ObjectType << DestructedType << Base->getSourceRange()
4054 << DestructedTypeInfo->getTypeLoc().getLocalSourceRange();
4056 // Recover by setting the destructed type to the object type.
4057 DestructedType = ObjectType;
4058 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(ObjectType,
4059 DestructedTypeStart);
4060 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
4064 // C++ [expr.pseudo]p2:
4065 // [...] Furthermore, the two type-names in a pseudo-destructor-name of the
4068 // ::[opt] nested-name-specifier[opt] type-name :: ~ type-name
4070 // shall designate the same scalar type.
4071 if (ScopeTypeInfo) {
4072 QualType ScopeType = ScopeTypeInfo->getType();
4073 if (!ScopeType->isDependentType() && !ObjectType->isDependentType() &&
4074 !Context.hasSameUnqualifiedType(ScopeType, ObjectType)) {
4076 Diag(ScopeTypeInfo->getTypeLoc().getLocalSourceRange().getBegin(),
4077 diag::err_pseudo_dtor_type_mismatch)
4078 << ObjectType << ScopeType << Base->getSourceRange()
4079 << ScopeTypeInfo->getTypeLoc().getLocalSourceRange();
4081 ScopeType = QualType();
4087 = new (Context) CXXPseudoDestructorExpr(Context, Base,
4088 OpKind == tok::arrow, OpLoc,
4089 SS.getWithLocInContext(Context),
4095 if (HasTrailingLParen)
4096 return Owned(Result);
4098 return DiagnoseDtorReference(Destructed.getLocation(), Result);
4101 ExprResult Sema::ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
4102 SourceLocation OpLoc,
4103 tok::TokenKind OpKind,
4105 UnqualifiedId &FirstTypeName,
4106 SourceLocation CCLoc,
4107 SourceLocation TildeLoc,
4108 UnqualifiedId &SecondTypeName,
4109 bool HasTrailingLParen) {
4110 assert((FirstTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
4111 FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) &&
4112 "Invalid first type name in pseudo-destructor");
4113 assert((SecondTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
4114 SecondTypeName.getKind() == UnqualifiedId::IK_Identifier) &&
4115 "Invalid second type name in pseudo-destructor");
4117 // C++ [expr.pseudo]p2:
4118 // The left-hand side of the dot operator shall be of scalar type. The
4119 // left-hand side of the arrow operator shall be of pointer to scalar type.
4120 // This scalar type is the object type.
4121 QualType ObjectType = Base->getType();
4122 if (OpKind == tok::arrow) {
4123 if (const PointerType *Ptr = ObjectType->getAs<PointerType>()) {
4124 ObjectType = Ptr->getPointeeType();
4125 } else if (!ObjectType->isDependentType()) {
4126 // The user wrote "p->" when she probably meant "p."; fix it.
4127 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
4128 << ObjectType << true
4129 << FixItHint::CreateReplacement(OpLoc, ".");
4130 if (isSFINAEContext())
4133 OpKind = tok::period;
4137 // Compute the object type that we should use for name lookup purposes. Only
4138 // record types and dependent types matter.
4139 ParsedType ObjectTypePtrForLookup;
4141 if (ObjectType->isRecordType())
4142 ObjectTypePtrForLookup = ParsedType::make(ObjectType);
4143 else if (ObjectType->isDependentType())
4144 ObjectTypePtrForLookup = ParsedType::make(Context.DependentTy);
4147 // Convert the name of the type being destructed (following the ~) into a
4148 // type (with source-location information).
4149 QualType DestructedType;
4150 TypeSourceInfo *DestructedTypeInfo = 0;
4151 PseudoDestructorTypeStorage Destructed;
4152 if (SecondTypeName.getKind() == UnqualifiedId::IK_Identifier) {
4153 ParsedType T = getTypeName(*SecondTypeName.Identifier,
4154 SecondTypeName.StartLocation,
4155 S, &SS, true, false, ObjectTypePtrForLookup);
4157 ((SS.isSet() && !computeDeclContext(SS, false)) ||
4158 (!SS.isSet() && ObjectType->isDependentType()))) {
4159 // The name of the type being destroyed is a dependent name, and we
4160 // couldn't find anything useful in scope. Just store the identifier and
4161 // it's location, and we'll perform (qualified) name lookup again at
4162 // template instantiation time.
4163 Destructed = PseudoDestructorTypeStorage(SecondTypeName.Identifier,
4164 SecondTypeName.StartLocation);
4166 Diag(SecondTypeName.StartLocation,
4167 diag::err_pseudo_dtor_destructor_non_type)
4168 << SecondTypeName.Identifier << ObjectType;
4169 if (isSFINAEContext())
4172 // Recover by assuming we had the right type all along.
4173 DestructedType = ObjectType;
4175 DestructedType = GetTypeFromParser(T, &DestructedTypeInfo);
4177 // Resolve the template-id to a type.
4178 TemplateIdAnnotation *TemplateId = SecondTypeName.TemplateId;
4179 ASTTemplateArgsPtr TemplateArgsPtr(*this,
4180 TemplateId->getTemplateArgs(),
4181 TemplateId->NumArgs);
4182 TypeResult T = ActOnTemplateIdType(TemplateId->SS,
4183 TemplateId->Template,
4184 TemplateId->TemplateNameLoc,
4185 TemplateId->LAngleLoc,
4187 TemplateId->RAngleLoc);
4188 if (T.isInvalid() || !T.get()) {
4189 // Recover by assuming we had the right type all along.
4190 DestructedType = ObjectType;
4192 DestructedType = GetTypeFromParser(T.get(), &DestructedTypeInfo);
4195 // If we've performed some kind of recovery, (re-)build the type source
4197 if (!DestructedType.isNull()) {
4198 if (!DestructedTypeInfo)
4199 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(DestructedType,
4200 SecondTypeName.StartLocation);
4201 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
4204 // Convert the name of the scope type (the type prior to '::') into a type.
4205 TypeSourceInfo *ScopeTypeInfo = 0;
4207 if (FirstTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
4208 FirstTypeName.Identifier) {
4209 if (FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) {
4210 ParsedType T = getTypeName(*FirstTypeName.Identifier,
4211 FirstTypeName.StartLocation,
4212 S, &SS, true, false, ObjectTypePtrForLookup);
4214 Diag(FirstTypeName.StartLocation,
4215 diag::err_pseudo_dtor_destructor_non_type)
4216 << FirstTypeName.Identifier << ObjectType;
4218 if (isSFINAEContext())
4221 // Just drop this type. It's unnecessary anyway.
4222 ScopeType = QualType();
4224 ScopeType = GetTypeFromParser(T, &ScopeTypeInfo);
4226 // Resolve the template-id to a type.
4227 TemplateIdAnnotation *TemplateId = FirstTypeName.TemplateId;
4228 ASTTemplateArgsPtr TemplateArgsPtr(*this,
4229 TemplateId->getTemplateArgs(),
4230 TemplateId->NumArgs);
4231 TypeResult T = ActOnTemplateIdType(TemplateId->SS,
4232 TemplateId->Template,
4233 TemplateId->TemplateNameLoc,
4234 TemplateId->LAngleLoc,
4236 TemplateId->RAngleLoc);
4237 if (T.isInvalid() || !T.get()) {
4238 // Recover by dropping this type.
4239 ScopeType = QualType();
4241 ScopeType = GetTypeFromParser(T.get(), &ScopeTypeInfo);
4245 if (!ScopeType.isNull() && !ScopeTypeInfo)
4246 ScopeTypeInfo = Context.getTrivialTypeSourceInfo(ScopeType,
4247 FirstTypeName.StartLocation);
4250 return BuildPseudoDestructorExpr(Base, OpLoc, OpKind, SS,
4251 ScopeTypeInfo, CCLoc, TildeLoc,
4252 Destructed, HasTrailingLParen);
4255 ExprResult Sema::BuildCXXMemberCallExpr(Expr *E, NamedDecl *FoundDecl,
4256 CXXMethodDecl *Method) {
4257 ExprResult Exp = PerformObjectArgumentInitialization(E, /*Qualifier=*/0,
4259 if (Exp.isInvalid())
4263 new (Context) MemberExpr(Exp.take(), /*IsArrow=*/false, Method,
4264 SourceLocation(), Method->getType(),
4265 VK_RValue, OK_Ordinary);
4266 QualType ResultType = Method->getResultType();
4267 ExprValueKind VK = Expr::getValueKindForType(ResultType);
4268 ResultType = ResultType.getNonLValueExprType(Context);
4270 MarkDeclarationReferenced(Exp.get()->getLocStart(), Method);
4271 CXXMemberCallExpr *CE =
4272 new (Context) CXXMemberCallExpr(Context, ME, 0, 0, ResultType, VK,
4273 Exp.get()->getLocEnd());
4277 ExprResult Sema::BuildCXXNoexceptExpr(SourceLocation KeyLoc, Expr *Operand,
4278 SourceLocation RParen) {
4279 return Owned(new (Context) CXXNoexceptExpr(Context.BoolTy, Operand,
4280 Operand->CanThrow(Context),
4284 ExprResult Sema::ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation,
4285 Expr *Operand, SourceLocation RParen) {
4286 return BuildCXXNoexceptExpr(KeyLoc, Operand, RParen);
4289 /// Perform the conversions required for an expression used in a
4290 /// context that ignores the result.
4291 ExprResult Sema::IgnoredValueConversions(Expr *E) {
4293 // [Except in specific positions,] an lvalue that does not have
4294 // array type is converted to the value stored in the
4295 // designated object (and is no longer an lvalue).
4296 if (E->isRValue()) return Owned(E);
4298 // We always want to do this on ObjC property references.
4299 if (E->getObjectKind() == OK_ObjCProperty) {
4300 ExprResult Res = ConvertPropertyForRValue(E);
4301 if (Res.isInvalid()) return Owned(E);
4303 if (E->isRValue()) return Owned(E);
4306 // Otherwise, this rule does not apply in C++, at least not for the moment.
4307 if (getLangOptions().CPlusPlus) return Owned(E);
4309 // GCC seems to also exclude expressions of incomplete enum type.
4310 if (const EnumType *T = E->getType()->getAs<EnumType>()) {
4311 if (!T->getDecl()->isComplete()) {
4312 // FIXME: stupid workaround for a codegen bug!
4313 E = ImpCastExprToType(E, Context.VoidTy, CK_ToVoid).take();
4318 ExprResult Res = DefaultFunctionArrayLvalueConversion(E);
4319 if (Res.isInvalid())
4323 if (!E->getType()->isVoidType())
4324 RequireCompleteType(E->getExprLoc(), E->getType(),
4325 diag::err_incomplete_type);
4329 ExprResult Sema::ActOnFinishFullExpr(Expr *FE) {
4330 ExprResult FullExpr = Owned(FE);
4332 if (!FullExpr.get())
4335 if (DiagnoseUnexpandedParameterPack(FullExpr.get()))
4338 FullExpr = CheckPlaceholderExpr(FullExpr.take());
4339 if (FullExpr.isInvalid())
4342 FullExpr = IgnoredValueConversions(FullExpr.take());
4343 if (FullExpr.isInvalid())
4346 CheckImplicitConversions(FullExpr.get());
4347 return MaybeCreateExprWithCleanups(FullExpr);
4350 StmtResult Sema::ActOnFinishFullStmt(Stmt *FullStmt) {
4351 if (!FullStmt) return StmtError();
4353 return MaybeCreateStmtWithCleanups(FullStmt);
4356 bool Sema::CheckMicrosoftIfExistsSymbol(CXXScopeSpec &SS,
4357 UnqualifiedId &Name) {
4358 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name);
4359 DeclarationName TargetName = TargetNameInfo.getName();
4363 // Do the redeclaration lookup in the current scope.
4364 LookupResult R(*this, TargetNameInfo, Sema::LookupAnyName,
4365 Sema::NotForRedeclaration);
4366 R.suppressDiagnostics();
4367 LookupParsedName(R, getCurScope(), &SS);