1 //===--- SemaExprCXX.cpp - Semantic Analysis for Expressions --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// \brief Implements semantic analysis for C++ expressions.
13 //===----------------------------------------------------------------------===//
15 #include "clang/Sema/SemaInternal.h"
16 #include "TreeTransform.h"
17 #include "TypeLocBuilder.h"
18 #include "clang/AST/ASTContext.h"
19 #include "clang/AST/ASTLambda.h"
20 #include "clang/AST/CXXInheritance.h"
21 #include "clang/AST/CharUnits.h"
22 #include "clang/AST/DeclObjC.h"
23 #include "clang/AST/EvaluatedExprVisitor.h"
24 #include "clang/AST/ExprCXX.h"
25 #include "clang/AST/ExprObjC.h"
26 #include "clang/AST/RecursiveASTVisitor.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 "clang/Sema/DeclSpec.h"
32 #include "clang/Sema/Initialization.h"
33 #include "clang/Sema/Lookup.h"
34 #include "clang/Sema/ParsedTemplate.h"
35 #include "clang/Sema/Scope.h"
36 #include "clang/Sema/ScopeInfo.h"
37 #include "clang/Sema/SemaLambda.h"
38 #include "clang/Sema/TemplateDeduction.h"
39 #include "llvm/ADT/APInt.h"
40 #include "llvm/ADT/STLExtras.h"
41 #include "llvm/Support/ErrorHandling.h"
42 using namespace clang;
45 /// \brief Handle the result of the special case name lookup for inheriting
46 /// constructor declarations. 'NS::X::X' and 'NS::X<...>::X' are treated as
47 /// constructor names in member using declarations, even if 'X' is not the
48 /// name of the corresponding type.
49 ParsedType Sema::getInheritingConstructorName(CXXScopeSpec &SS,
50 SourceLocation NameLoc,
51 IdentifierInfo &Name) {
52 NestedNameSpecifier *NNS = SS.getScopeRep();
54 // Convert the nested-name-specifier into a type.
56 switch (NNS->getKind()) {
57 case NestedNameSpecifier::TypeSpec:
58 case NestedNameSpecifier::TypeSpecWithTemplate:
59 Type = QualType(NNS->getAsType(), 0);
62 case NestedNameSpecifier::Identifier:
63 // Strip off the last layer of the nested-name-specifier and build a
64 // typename type for it.
65 assert(NNS->getAsIdentifier() == &Name && "not a constructor name");
66 Type = Context.getDependentNameType(ETK_None, NNS->getPrefix(),
67 NNS->getAsIdentifier());
70 case NestedNameSpecifier::Global:
71 case NestedNameSpecifier::Super:
72 case NestedNameSpecifier::Namespace:
73 case NestedNameSpecifier::NamespaceAlias:
74 llvm_unreachable("Nested name specifier is not a type for inheriting ctor");
77 // This reference to the type is located entirely at the location of the
78 // final identifier in the qualified-id.
79 return CreateParsedType(Type,
80 Context.getTrivialTypeSourceInfo(Type, NameLoc));
83 ParsedType Sema::getDestructorName(SourceLocation TildeLoc,
85 SourceLocation NameLoc,
86 Scope *S, CXXScopeSpec &SS,
87 ParsedType ObjectTypePtr,
88 bool EnteringContext) {
89 // Determine where to perform name lookup.
91 // FIXME: This area of the standard is very messy, and the current
92 // wording is rather unclear about which scopes we search for the
93 // destructor name; see core issues 399 and 555. Issue 399 in
94 // particular shows where the current description of destructor name
95 // lookup is completely out of line with existing practice, e.g.,
96 // this appears to be ill-formed:
99 // template <typename T> struct S {
104 // void f(N::S<int>* s) {
105 // s->N::S<int>::~S();
108 // See also PR6358 and PR6359.
109 // For this reason, we're currently only doing the C++03 version of this
110 // code; the C++0x version has to wait until we get a proper spec.
112 DeclContext *LookupCtx = nullptr;
113 bool isDependent = false;
114 bool LookInScope = false;
119 // If we have an object type, it's because we are in a
120 // pseudo-destructor-expression or a member access expression, and
121 // we know what type we're looking for.
123 SearchType = GetTypeFromParser(ObjectTypePtr);
126 NestedNameSpecifier *NNS = SS.getScopeRep();
128 bool AlreadySearched = false;
129 bool LookAtPrefix = true;
130 // C++11 [basic.lookup.qual]p6:
131 // If a pseudo-destructor-name (5.2.4) contains a nested-name-specifier,
132 // the type-names are looked up as types in the scope designated by the
133 // nested-name-specifier. Similarly, in a qualified-id of the form:
135 // nested-name-specifier[opt] class-name :: ~ class-name
137 // the second class-name is looked up in the same scope as the first.
139 // Here, we determine whether the code below is permitted to look at the
140 // prefix of the nested-name-specifier.
141 DeclContext *DC = computeDeclContext(SS, EnteringContext);
142 if (DC && DC->isFileContext()) {
143 AlreadySearched = true;
146 } else if (DC && isa<CXXRecordDecl>(DC)) {
147 LookAtPrefix = false;
151 // The second case from the C++03 rules quoted further above.
152 NestedNameSpecifier *Prefix = nullptr;
153 if (AlreadySearched) {
154 // Nothing left to do.
155 } else if (LookAtPrefix && (Prefix = NNS->getPrefix())) {
156 CXXScopeSpec PrefixSS;
157 PrefixSS.Adopt(NestedNameSpecifierLoc(Prefix, SS.location_data()));
158 LookupCtx = computeDeclContext(PrefixSS, EnteringContext);
159 isDependent = isDependentScopeSpecifier(PrefixSS);
160 } else if (ObjectTypePtr) {
161 LookupCtx = computeDeclContext(SearchType);
162 isDependent = SearchType->isDependentType();
164 LookupCtx = computeDeclContext(SS, EnteringContext);
165 isDependent = LookupCtx && LookupCtx->isDependentContext();
167 } else if (ObjectTypePtr) {
168 // C++ [basic.lookup.classref]p3:
169 // If the unqualified-id is ~type-name, the type-name is looked up
170 // in the context of the entire postfix-expression. If the type T
171 // of the object expression is of a class type C, the type-name is
172 // also looked up in the scope of class C. At least one of the
173 // lookups shall find a name that refers to (possibly
175 LookupCtx = computeDeclContext(SearchType);
176 isDependent = SearchType->isDependentType();
177 assert((isDependent || !SearchType->isIncompleteType()) &&
178 "Caller should have completed object type");
182 // Perform lookup into the current scope (only).
186 TypeDecl *NonMatchingTypeDecl = nullptr;
187 LookupResult Found(*this, &II, NameLoc, LookupOrdinaryName);
188 for (unsigned Step = 0; Step != 2; ++Step) {
189 // Look for the name first in the computed lookup context (if we
190 // have one) and, if that fails to find a match, in the scope (if
191 // we're allowed to look there).
193 if (Step == 0 && LookupCtx)
194 LookupQualifiedName(Found, LookupCtx);
195 else if (Step == 1 && LookInScope && S)
196 LookupName(Found, S);
200 // FIXME: Should we be suppressing ambiguities here?
201 if (Found.isAmbiguous())
204 if (TypeDecl *Type = Found.getAsSingle<TypeDecl>()) {
205 QualType T = Context.getTypeDeclType(Type);
206 MarkAnyDeclReferenced(Type->getLocation(), Type, /*OdrUse=*/false);
208 if (SearchType.isNull() || SearchType->isDependentType() ||
209 Context.hasSameUnqualifiedType(T, SearchType)) {
210 // We found our type!
212 return CreateParsedType(T,
213 Context.getTrivialTypeSourceInfo(T, NameLoc));
216 if (!SearchType.isNull())
217 NonMatchingTypeDecl = Type;
220 // If the name that we found is a class template name, and it is
221 // the same name as the template name in the last part of the
222 // nested-name-specifier (if present) or the object type, then
223 // this is the destructor for that class.
224 // FIXME: This is a workaround until we get real drafting for core
225 // issue 399, for which there isn't even an obvious direction.
226 if (ClassTemplateDecl *Template = Found.getAsSingle<ClassTemplateDecl>()) {
227 QualType MemberOfType;
229 if (DeclContext *Ctx = computeDeclContext(SS, EnteringContext)) {
230 // Figure out the type of the context, if it has one.
231 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx))
232 MemberOfType = Context.getTypeDeclType(Record);
235 if (MemberOfType.isNull())
236 MemberOfType = SearchType;
238 if (MemberOfType.isNull())
241 // We're referring into a class template specialization. If the
242 // class template we found is the same as the template being
243 // specialized, we found what we are looking for.
244 if (const RecordType *Record = MemberOfType->getAs<RecordType>()) {
245 if (ClassTemplateSpecializationDecl *Spec
246 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) {
247 if (Spec->getSpecializedTemplate()->getCanonicalDecl() ==
248 Template->getCanonicalDecl())
249 return CreateParsedType(
251 Context.getTrivialTypeSourceInfo(MemberOfType, NameLoc));
257 // We're referring to an unresolved class template
258 // specialization. Determine whether we class template we found
259 // is the same as the template being specialized or, if we don't
260 // know which template is being specialized, that it at least
261 // has the same name.
262 if (const TemplateSpecializationType *SpecType
263 = MemberOfType->getAs<TemplateSpecializationType>()) {
264 TemplateName SpecName = SpecType->getTemplateName();
266 // The class template we found is the same template being
268 if (TemplateDecl *SpecTemplate = SpecName.getAsTemplateDecl()) {
269 if (SpecTemplate->getCanonicalDecl() == Template->getCanonicalDecl())
270 return CreateParsedType(
272 Context.getTrivialTypeSourceInfo(MemberOfType, NameLoc));
277 // The class template we found has the same name as the
278 // (dependent) template name being specialized.
279 if (DependentTemplateName *DepTemplate
280 = SpecName.getAsDependentTemplateName()) {
281 if (DepTemplate->isIdentifier() &&
282 DepTemplate->getIdentifier() == Template->getIdentifier())
283 return CreateParsedType(
285 Context.getTrivialTypeSourceInfo(MemberOfType, NameLoc));
294 // We didn't find our type, but that's okay: it's dependent
297 // FIXME: What if we have no nested-name-specifier?
298 QualType T = CheckTypenameType(ETK_None, SourceLocation(),
299 SS.getWithLocInContext(Context),
301 return ParsedType::make(T);
304 if (NonMatchingTypeDecl) {
305 QualType T = Context.getTypeDeclType(NonMatchingTypeDecl);
306 Diag(NameLoc, diag::err_destructor_expr_type_mismatch)
308 Diag(NonMatchingTypeDecl->getLocation(), diag::note_destructor_type_here)
310 } else if (ObjectTypePtr)
311 Diag(NameLoc, diag::err_ident_in_dtor_not_a_type)
314 SemaDiagnosticBuilder DtorDiag = Diag(NameLoc,
315 diag::err_destructor_class_name);
317 const DeclContext *Ctx = S->getEntity();
318 if (const CXXRecordDecl *Class = dyn_cast_or_null<CXXRecordDecl>(Ctx))
319 DtorDiag << FixItHint::CreateReplacement(SourceRange(NameLoc),
320 Class->getNameAsString());
327 ParsedType Sema::getDestructorType(const DeclSpec& DS, ParsedType ObjectType) {
328 if (DS.getTypeSpecType() == DeclSpec::TST_error || !ObjectType)
330 assert(DS.getTypeSpecType() == DeclSpec::TST_decltype
331 && "only get destructor types from declspecs");
332 QualType T = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc());
333 QualType SearchType = GetTypeFromParser(ObjectType);
334 if (SearchType->isDependentType() || Context.hasSameUnqualifiedType(SearchType, T)) {
335 return ParsedType::make(T);
338 Diag(DS.getTypeSpecTypeLoc(), diag::err_destructor_expr_type_mismatch)
343 bool Sema::checkLiteralOperatorId(const CXXScopeSpec &SS,
344 const UnqualifiedId &Name) {
345 assert(Name.getKind() == UnqualifiedId::IK_LiteralOperatorId);
350 switch (SS.getScopeRep()->getKind()) {
351 case NestedNameSpecifier::Identifier:
352 case NestedNameSpecifier::TypeSpec:
353 case NestedNameSpecifier::TypeSpecWithTemplate:
354 // Per C++11 [over.literal]p2, literal operators can only be declared at
355 // namespace scope. Therefore, this unqualified-id cannot name anything.
356 // Reject it early, because we have no AST representation for this in the
357 // case where the scope is dependent.
358 Diag(Name.getLocStart(), diag::err_literal_operator_id_outside_namespace)
362 case NestedNameSpecifier::Global:
363 case NestedNameSpecifier::Super:
364 case NestedNameSpecifier::Namespace:
365 case NestedNameSpecifier::NamespaceAlias:
369 llvm_unreachable("unknown nested name specifier kind");
372 /// \brief Build a C++ typeid expression with a type operand.
373 ExprResult Sema::BuildCXXTypeId(QualType TypeInfoType,
374 SourceLocation TypeidLoc,
375 TypeSourceInfo *Operand,
376 SourceLocation RParenLoc) {
377 // C++ [expr.typeid]p4:
378 // The top-level cv-qualifiers of the lvalue expression or the type-id
379 // that is the operand of typeid are always ignored.
380 // If the type of the type-id is a class type or a reference to a class
381 // type, the class shall be completely-defined.
384 = Context.getUnqualifiedArrayType(Operand->getType().getNonReferenceType(),
386 if (T->getAs<RecordType>() &&
387 RequireCompleteType(TypeidLoc, T, diag::err_incomplete_typeid))
390 if (T->isVariablyModifiedType())
391 return ExprError(Diag(TypeidLoc, diag::err_variably_modified_typeid) << T);
393 return new (Context) CXXTypeidExpr(TypeInfoType.withConst(), Operand,
394 SourceRange(TypeidLoc, RParenLoc));
397 /// \brief Build a C++ typeid expression with an expression operand.
398 ExprResult Sema::BuildCXXTypeId(QualType TypeInfoType,
399 SourceLocation TypeidLoc,
401 SourceLocation RParenLoc) {
402 bool WasEvaluated = false;
403 if (E && !E->isTypeDependent()) {
404 if (E->getType()->isPlaceholderType()) {
405 ExprResult result = CheckPlaceholderExpr(E);
406 if (result.isInvalid()) return ExprError();
410 QualType T = E->getType();
411 if (const RecordType *RecordT = T->getAs<RecordType>()) {
412 CXXRecordDecl *RecordD = cast<CXXRecordDecl>(RecordT->getDecl());
413 // C++ [expr.typeid]p3:
414 // [...] If the type of the expression is a class type, the class
415 // shall be completely-defined.
416 if (RequireCompleteType(TypeidLoc, T, diag::err_incomplete_typeid))
419 // C++ [expr.typeid]p3:
420 // When typeid is applied to an expression other than an glvalue of a
421 // polymorphic class type [...] [the] expression is an unevaluated
423 if (RecordD->isPolymorphic() && E->isGLValue()) {
424 // The subexpression is potentially evaluated; switch the context
425 // and recheck the subexpression.
426 ExprResult Result = TransformToPotentiallyEvaluated(E);
427 if (Result.isInvalid()) return ExprError();
430 // We require a vtable to query the type at run time.
431 MarkVTableUsed(TypeidLoc, RecordD);
436 // C++ [expr.typeid]p4:
437 // [...] If the type of the type-id is a reference to a possibly
438 // cv-qualified type, the result of the typeid expression refers to a
439 // std::type_info object representing the cv-unqualified referenced
442 QualType UnqualT = Context.getUnqualifiedArrayType(T, Quals);
443 if (!Context.hasSameType(T, UnqualT)) {
445 E = ImpCastExprToType(E, UnqualT, CK_NoOp, E->getValueKind()).get();
449 if (E->getType()->isVariablyModifiedType())
450 return ExprError(Diag(TypeidLoc, diag::err_variably_modified_typeid)
452 else if (ActiveTemplateInstantiations.empty() &&
453 E->HasSideEffects(Context, WasEvaluated)) {
454 // The expression operand for typeid is in an unevaluated expression
455 // context, so side effects could result in unintended consequences.
456 Diag(E->getExprLoc(), WasEvaluated
457 ? diag::warn_side_effects_typeid
458 : diag::warn_side_effects_unevaluated_context);
461 return new (Context) CXXTypeidExpr(TypeInfoType.withConst(), E,
462 SourceRange(TypeidLoc, RParenLoc));
465 /// ActOnCXXTypeidOfType - Parse typeid( type-id ) or typeid (expression);
467 Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc,
468 bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
469 // Find the std::type_info type.
470 if (!getStdNamespace())
471 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
473 if (!CXXTypeInfoDecl) {
474 IdentifierInfo *TypeInfoII = &PP.getIdentifierTable().get("type_info");
475 LookupResult R(*this, TypeInfoII, SourceLocation(), LookupTagName);
476 LookupQualifiedName(R, getStdNamespace());
477 CXXTypeInfoDecl = R.getAsSingle<RecordDecl>();
478 // Microsoft's typeinfo doesn't have type_info in std but in the global
479 // namespace if _HAS_EXCEPTIONS is defined to 0. See PR13153.
480 if (!CXXTypeInfoDecl && LangOpts.MSVCCompat) {
481 LookupQualifiedName(R, Context.getTranslationUnitDecl());
482 CXXTypeInfoDecl = R.getAsSingle<RecordDecl>();
484 if (!CXXTypeInfoDecl)
485 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
488 if (!getLangOpts().RTTI) {
489 return ExprError(Diag(OpLoc, diag::err_no_typeid_with_fno_rtti));
492 QualType TypeInfoType = Context.getTypeDeclType(CXXTypeInfoDecl);
495 // The operand is a type; handle it as such.
496 TypeSourceInfo *TInfo = nullptr;
497 QualType T = GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrExpr),
503 TInfo = Context.getTrivialTypeSourceInfo(T, OpLoc);
505 return BuildCXXTypeId(TypeInfoType, OpLoc, TInfo, RParenLoc);
508 // The operand is an expression.
509 return BuildCXXTypeId(TypeInfoType, OpLoc, (Expr*)TyOrExpr, RParenLoc);
512 /// \brief Build a Microsoft __uuidof expression with a type operand.
513 ExprResult Sema::BuildCXXUuidof(QualType TypeInfoType,
514 SourceLocation TypeidLoc,
515 TypeSourceInfo *Operand,
516 SourceLocation RParenLoc) {
517 if (!Operand->getType()->isDependentType()) {
518 bool HasMultipleGUIDs = false;
519 if (!CXXUuidofExpr::GetUuidAttrOfType(Operand->getType(),
520 &HasMultipleGUIDs)) {
521 if (HasMultipleGUIDs)
522 return ExprError(Diag(TypeidLoc, diag::err_uuidof_with_multiple_guids));
524 return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid));
528 return new (Context) CXXUuidofExpr(TypeInfoType.withConst(), Operand,
529 SourceRange(TypeidLoc, RParenLoc));
532 /// \brief Build a Microsoft __uuidof expression with an expression operand.
533 ExprResult Sema::BuildCXXUuidof(QualType TypeInfoType,
534 SourceLocation TypeidLoc,
536 SourceLocation RParenLoc) {
537 if (!E->getType()->isDependentType()) {
538 bool HasMultipleGUIDs = false;
539 if (!CXXUuidofExpr::GetUuidAttrOfType(E->getType(), &HasMultipleGUIDs) &&
540 !E->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
541 if (HasMultipleGUIDs)
542 return ExprError(Diag(TypeidLoc, diag::err_uuidof_with_multiple_guids));
544 return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid));
548 return new (Context) CXXUuidofExpr(TypeInfoType.withConst(), E,
549 SourceRange(TypeidLoc, RParenLoc));
552 /// ActOnCXXUuidof - Parse __uuidof( type-id ) or __uuidof (expression);
554 Sema::ActOnCXXUuidof(SourceLocation OpLoc, SourceLocation LParenLoc,
555 bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
556 // If MSVCGuidDecl has not been cached, do the lookup.
558 IdentifierInfo *GuidII = &PP.getIdentifierTable().get("_GUID");
559 LookupResult R(*this, GuidII, SourceLocation(), LookupTagName);
560 LookupQualifiedName(R, Context.getTranslationUnitDecl());
561 MSVCGuidDecl = R.getAsSingle<RecordDecl>();
563 return ExprError(Diag(OpLoc, diag::err_need_header_before_ms_uuidof));
566 QualType GuidType = Context.getTypeDeclType(MSVCGuidDecl);
569 // The operand is a type; handle it as such.
570 TypeSourceInfo *TInfo = nullptr;
571 QualType T = GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrExpr),
577 TInfo = Context.getTrivialTypeSourceInfo(T, OpLoc);
579 return BuildCXXUuidof(GuidType, OpLoc, TInfo, RParenLoc);
582 // The operand is an expression.
583 return BuildCXXUuidof(GuidType, OpLoc, (Expr*)TyOrExpr, RParenLoc);
586 /// ActOnCXXBoolLiteral - Parse {true,false} literals.
588 Sema::ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
589 assert((Kind == tok::kw_true || Kind == tok::kw_false) &&
590 "Unknown C++ Boolean value!");
592 CXXBoolLiteralExpr(Kind == tok::kw_true, Context.BoolTy, OpLoc);
595 /// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
597 Sema::ActOnCXXNullPtrLiteral(SourceLocation Loc) {
598 return new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc);
601 /// ActOnCXXThrow - Parse throw expressions.
603 Sema::ActOnCXXThrow(Scope *S, SourceLocation OpLoc, Expr *Ex) {
604 bool IsThrownVarInScope = false;
606 // C++0x [class.copymove]p31:
607 // When certain criteria are met, an implementation is allowed to omit the
608 // copy/move construction of a class object [...]
610 // - in a throw-expression, when the operand is the name of a
611 // non-volatile automatic object (other than a function or catch-
612 // clause parameter) whose scope does not extend beyond the end of the
613 // innermost enclosing try-block (if there is one), the copy/move
614 // operation from the operand to the exception object (15.1) can be
615 // omitted by constructing the automatic object directly into the
617 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Ex->IgnoreParens()))
618 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
619 if (Var->hasLocalStorage() && !Var->getType().isVolatileQualified()) {
620 for( ; S; S = S->getParent()) {
621 if (S->isDeclScope(Var)) {
622 IsThrownVarInScope = true;
627 (Scope::FnScope | Scope::ClassScope | Scope::BlockScope |
628 Scope::FunctionPrototypeScope | Scope::ObjCMethodScope |
636 return BuildCXXThrow(OpLoc, Ex, IsThrownVarInScope);
639 ExprResult Sema::BuildCXXThrow(SourceLocation OpLoc, Expr *Ex,
640 bool IsThrownVarInScope) {
641 // Don't report an error if 'throw' is used in system headers.
642 if (!getLangOpts().CXXExceptions &&
643 !getSourceManager().isInSystemHeader(OpLoc))
644 Diag(OpLoc, diag::err_exceptions_disabled) << "throw";
646 if (getCurScope() && getCurScope()->isOpenMPSimdDirectiveScope())
647 Diag(OpLoc, diag::err_omp_simd_region_cannot_use_stmt) << "throw";
649 if (Ex && !Ex->isTypeDependent()) {
650 QualType ExceptionObjectTy = Context.getExceptionObjectType(Ex->getType());
651 if (CheckCXXThrowOperand(OpLoc, ExceptionObjectTy, Ex))
654 // Initialize the exception result. This implicitly weeds out
655 // abstract types or types with inaccessible copy constructors.
657 // C++0x [class.copymove]p31:
658 // When certain criteria are met, an implementation is allowed to omit the
659 // copy/move construction of a class object [...]
661 // - in a throw-expression, when the operand is the name of a
662 // non-volatile automatic object (other than a function or
664 // parameter) whose scope does not extend beyond the end of the
665 // innermost enclosing try-block (if there is one), the copy/move
666 // operation from the operand to the exception object (15.1) can be
667 // omitted by constructing the automatic object directly into the
669 const VarDecl *NRVOVariable = nullptr;
670 if (IsThrownVarInScope)
671 NRVOVariable = getCopyElisionCandidate(QualType(), Ex, false);
673 InitializedEntity Entity = InitializedEntity::InitializeException(
674 OpLoc, ExceptionObjectTy,
675 /*NRVO=*/NRVOVariable != nullptr);
676 ExprResult Res = PerformMoveOrCopyInitialization(
677 Entity, NRVOVariable, QualType(), Ex, IsThrownVarInScope);
684 CXXThrowExpr(Ex, Context.VoidTy, OpLoc, IsThrownVarInScope);
688 collectPublicBases(CXXRecordDecl *RD,
689 llvm::DenseMap<CXXRecordDecl *, unsigned> &SubobjectsSeen,
690 llvm::SmallPtrSetImpl<CXXRecordDecl *> &VBases,
691 llvm::SetVector<CXXRecordDecl *> &PublicSubobjectsSeen,
692 bool ParentIsPublic) {
693 for (const CXXBaseSpecifier &BS : RD->bases()) {
694 CXXRecordDecl *BaseDecl = BS.getType()->getAsCXXRecordDecl();
696 // Virtual bases constitute the same subobject. Non-virtual bases are
697 // always distinct subobjects.
699 NewSubobject = VBases.insert(BaseDecl).second;
704 ++SubobjectsSeen[BaseDecl];
706 // Only add subobjects which have public access throughout the entire chain.
707 bool PublicPath = ParentIsPublic && BS.getAccessSpecifier() == AS_public;
709 PublicSubobjectsSeen.insert(BaseDecl);
711 // Recurse on to each base subobject.
712 collectPublicBases(BaseDecl, SubobjectsSeen, VBases, PublicSubobjectsSeen,
717 static void getUnambiguousPublicSubobjects(
718 CXXRecordDecl *RD, llvm::SmallVectorImpl<CXXRecordDecl *> &Objects) {
719 llvm::DenseMap<CXXRecordDecl *, unsigned> SubobjectsSeen;
720 llvm::SmallSet<CXXRecordDecl *, 2> VBases;
721 llvm::SetVector<CXXRecordDecl *> PublicSubobjectsSeen;
722 SubobjectsSeen[RD] = 1;
723 PublicSubobjectsSeen.insert(RD);
724 collectPublicBases(RD, SubobjectsSeen, VBases, PublicSubobjectsSeen,
725 /*ParentIsPublic=*/true);
727 for (CXXRecordDecl *PublicSubobject : PublicSubobjectsSeen) {
728 // Skip ambiguous objects.
729 if (SubobjectsSeen[PublicSubobject] > 1)
732 Objects.push_back(PublicSubobject);
736 /// CheckCXXThrowOperand - Validate the operand of a throw.
737 bool Sema::CheckCXXThrowOperand(SourceLocation ThrowLoc,
738 QualType ExceptionObjectTy, Expr *E) {
739 // If the type of the exception would be an incomplete type or a pointer
740 // to an incomplete type other than (cv) void the program is ill-formed.
741 QualType Ty = ExceptionObjectTy;
742 bool isPointer = false;
743 if (const PointerType* Ptr = Ty->getAs<PointerType>()) {
744 Ty = Ptr->getPointeeType();
747 if (!isPointer || !Ty->isVoidType()) {
748 if (RequireCompleteType(ThrowLoc, Ty,
749 isPointer ? diag::err_throw_incomplete_ptr
750 : diag::err_throw_incomplete,
751 E->getSourceRange()))
754 if (RequireNonAbstractType(ThrowLoc, ExceptionObjectTy,
755 diag::err_throw_abstract_type, E))
759 // If the exception has class type, we need additional handling.
760 CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
764 // If we are throwing a polymorphic class type or pointer thereof,
765 // exception handling will make use of the vtable.
766 MarkVTableUsed(ThrowLoc, RD);
768 // If a pointer is thrown, the referenced object will not be destroyed.
772 // If the class has a destructor, we must be able to call it.
773 if (!RD->hasIrrelevantDestructor()) {
774 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) {
775 MarkFunctionReferenced(E->getExprLoc(), Destructor);
776 CheckDestructorAccess(E->getExprLoc(), Destructor,
777 PDiag(diag::err_access_dtor_exception) << Ty);
778 if (DiagnoseUseOfDecl(Destructor, E->getExprLoc()))
783 // The MSVC ABI creates a list of all types which can catch the exception
784 // object. This list also references the appropriate copy constructor to call
785 // if the object is caught by value and has a non-trivial copy constructor.
786 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
787 // We are only interested in the public, unambiguous bases contained within
788 // the exception object. Bases which are ambiguous or otherwise
789 // inaccessible are not catchable types.
790 llvm::SmallVector<CXXRecordDecl *, 2> UnambiguousPublicSubobjects;
791 getUnambiguousPublicSubobjects(RD, UnambiguousPublicSubobjects);
793 for (CXXRecordDecl *Subobject : UnambiguousPublicSubobjects) {
794 // Attempt to lookup the copy constructor. Various pieces of machinery
795 // will spring into action, like template instantiation, which means this
796 // cannot be a simple walk of the class's decls. Instead, we must perform
797 // lookup and overload resolution.
798 CXXConstructorDecl *CD = LookupCopyingConstructor(Subobject, 0);
802 // Mark the constructor referenced as it is used by this throw expression.
803 MarkFunctionReferenced(E->getExprLoc(), CD);
805 // Skip this copy constructor if it is trivial, we don't need to record it
806 // in the catchable type data.
810 // The copy constructor is non-trivial, create a mapping from this class
811 // type to this constructor.
812 // N.B. The selection of copy constructor is not sensitive to this
813 // particular throw-site. Lookup will be performed at the catch-site to
814 // ensure that the copy constructor is, in fact, accessible (via
815 // friendship or any other means).
816 Context.addCopyConstructorForExceptionObject(Subobject, CD);
818 // We don't keep the instantiated default argument expressions around so
819 // we must rebuild them here.
820 for (unsigned I = 1, E = CD->getNumParams(); I != E; ++I) {
821 // Skip any default arguments that we've already instantiated.
822 if (Context.getDefaultArgExprForConstructor(CD, I))
826 BuildCXXDefaultArgExpr(ThrowLoc, CD, CD->getParamDecl(I)).get();
827 Context.addDefaultArgExprForConstructor(CD, I, DefaultArg);
835 QualType Sema::getCurrentThisType() {
836 DeclContext *DC = getFunctionLevelDeclContext();
837 QualType ThisTy = CXXThisTypeOverride;
838 if (CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(DC)) {
839 if (method && method->isInstance())
840 ThisTy = method->getThisType(Context);
842 if (ThisTy.isNull()) {
843 if (isGenericLambdaCallOperatorSpecialization(CurContext) &&
844 CurContext->getParent()->getParent()->isRecord()) {
845 // This is a generic lambda call operator that is being instantiated
846 // within a default initializer - so use the enclosing class as 'this'.
847 // There is no enclosing member function to retrieve the 'this' pointer
849 QualType ClassTy = Context.getTypeDeclType(
850 cast<CXXRecordDecl>(CurContext->getParent()->getParent()));
851 // There are no cv-qualifiers for 'this' within default initializers,
852 // per [expr.prim.general]p4.
853 return Context.getPointerType(ClassTy);
859 Sema::CXXThisScopeRAII::CXXThisScopeRAII(Sema &S,
861 unsigned CXXThisTypeQuals,
863 : S(S), OldCXXThisTypeOverride(S.CXXThisTypeOverride), Enabled(false)
865 if (!Enabled || !ContextDecl)
868 CXXRecordDecl *Record = nullptr;
869 if (ClassTemplateDecl *Template = dyn_cast<ClassTemplateDecl>(ContextDecl))
870 Record = Template->getTemplatedDecl();
872 Record = cast<CXXRecordDecl>(ContextDecl);
874 S.CXXThisTypeOverride
875 = S.Context.getPointerType(
876 S.Context.getRecordType(Record).withCVRQualifiers(CXXThisTypeQuals));
878 this->Enabled = true;
882 Sema::CXXThisScopeRAII::~CXXThisScopeRAII() {
884 S.CXXThisTypeOverride = OldCXXThisTypeOverride;
888 static Expr *captureThis(ASTContext &Context, RecordDecl *RD,
889 QualType ThisTy, SourceLocation Loc) {
891 = FieldDecl::Create(Context, RD, Loc, Loc, nullptr, ThisTy,
892 Context.getTrivialTypeSourceInfo(ThisTy, Loc),
893 nullptr, false, ICIS_NoInit);
894 Field->setImplicit(true);
895 Field->setAccess(AS_private);
897 return new (Context) CXXThisExpr(Loc, ThisTy, /*isImplicit*/true);
900 bool Sema::CheckCXXThisCapture(SourceLocation Loc, bool Explicit,
901 bool BuildAndDiagnose, const unsigned *const FunctionScopeIndexToStopAt) {
902 // We don't need to capture this in an unevaluated context.
903 if (isUnevaluatedContext() && !Explicit)
906 const unsigned MaxFunctionScopesIndex = FunctionScopeIndexToStopAt ?
907 *FunctionScopeIndexToStopAt : FunctionScopes.size() - 1;
908 // Otherwise, check that we can capture 'this'.
909 unsigned NumClosures = 0;
910 for (unsigned idx = MaxFunctionScopesIndex; idx != 0; idx--) {
911 if (CapturingScopeInfo *CSI =
912 dyn_cast<CapturingScopeInfo>(FunctionScopes[idx])) {
913 if (CSI->CXXThisCaptureIndex != 0) {
914 // 'this' is already being captured; there isn't anything more to do.
917 LambdaScopeInfo *LSI = dyn_cast<LambdaScopeInfo>(CSI);
918 if (LSI && isGenericLambdaCallOperatorSpecialization(LSI->CallOperator)) {
919 // This context can't implicitly capture 'this'; fail out.
920 if (BuildAndDiagnose)
921 Diag(Loc, diag::err_this_capture) << Explicit;
924 if (CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_LambdaByref ||
925 CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_LambdaByval ||
926 CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_Block ||
927 CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_CapturedRegion ||
929 // This closure can capture 'this'; continue looking upwards.
934 // This context can't implicitly capture 'this'; fail out.
935 if (BuildAndDiagnose)
936 Diag(Loc, diag::err_this_capture) << Explicit;
941 if (!BuildAndDiagnose) return false;
942 // Mark that we're implicitly capturing 'this' in all the scopes we skipped.
943 // FIXME: We need to delay this marking in PotentiallyPotentiallyEvaluated
945 for (unsigned idx = MaxFunctionScopesIndex; NumClosures;
946 --idx, --NumClosures) {
947 CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FunctionScopes[idx]);
948 Expr *ThisExpr = nullptr;
949 QualType ThisTy = getCurrentThisType();
950 if (LambdaScopeInfo *LSI = dyn_cast<LambdaScopeInfo>(CSI))
951 // For lambda expressions, build a field and an initializing expression.
952 ThisExpr = captureThis(Context, LSI->Lambda, ThisTy, Loc);
953 else if (CapturedRegionScopeInfo *RSI
954 = dyn_cast<CapturedRegionScopeInfo>(FunctionScopes[idx]))
955 ThisExpr = captureThis(Context, RSI->TheRecordDecl, ThisTy, Loc);
957 bool isNested = NumClosures > 1;
958 CSI->addThisCapture(isNested, Loc, ThisTy, ThisExpr);
963 ExprResult Sema::ActOnCXXThis(SourceLocation Loc) {
964 /// C++ 9.3.2: In the body of a non-static member function, the keyword this
965 /// is a non-lvalue expression whose value is the address of the object for
966 /// which the function is called.
968 QualType ThisTy = getCurrentThisType();
969 if (ThisTy.isNull()) return Diag(Loc, diag::err_invalid_this_use);
971 CheckCXXThisCapture(Loc);
972 return new (Context) CXXThisExpr(Loc, ThisTy, /*isImplicit=*/false);
975 bool Sema::isThisOutsideMemberFunctionBody(QualType BaseType) {
976 // If we're outside the body of a member function, then we'll have a specified
978 if (CXXThisTypeOverride.isNull())
981 // Determine whether we're looking into a class that's currently being
983 CXXRecordDecl *Class = BaseType->getAsCXXRecordDecl();
984 return Class && Class->isBeingDefined();
988 Sema::ActOnCXXTypeConstructExpr(ParsedType TypeRep,
989 SourceLocation LParenLoc,
991 SourceLocation RParenLoc) {
995 TypeSourceInfo *TInfo;
996 QualType Ty = GetTypeFromParser(TypeRep, &TInfo);
998 TInfo = Context.getTrivialTypeSourceInfo(Ty, SourceLocation());
1000 return BuildCXXTypeConstructExpr(TInfo, LParenLoc, exprs, RParenLoc);
1003 /// ActOnCXXTypeConstructExpr - Parse construction of a specified type.
1004 /// Can be interpreted either as function-style casting ("int(x)")
1005 /// or class type construction ("ClassType(x,y,z)")
1006 /// or creation of a value-initialized type ("int()").
1008 Sema::BuildCXXTypeConstructExpr(TypeSourceInfo *TInfo,
1009 SourceLocation LParenLoc,
1011 SourceLocation RParenLoc) {
1012 QualType Ty = TInfo->getType();
1013 SourceLocation TyBeginLoc = TInfo->getTypeLoc().getBeginLoc();
1015 if (Ty->isDependentType() || CallExpr::hasAnyTypeDependentArguments(Exprs)) {
1016 return CXXUnresolvedConstructExpr::Create(Context, TInfo, LParenLoc, Exprs,
1020 bool ListInitialization = LParenLoc.isInvalid();
1021 assert((!ListInitialization || (Exprs.size() == 1 && isa<InitListExpr>(Exprs[0])))
1022 && "List initialization must have initializer list as expression.");
1023 SourceRange FullRange = SourceRange(TyBeginLoc,
1024 ListInitialization ? Exprs[0]->getSourceRange().getEnd() : RParenLoc);
1026 // C++ [expr.type.conv]p1:
1027 // If the expression list is a single expression, the type conversion
1028 // expression is equivalent (in definedness, and if defined in meaning) to the
1029 // corresponding cast expression.
1030 if (Exprs.size() == 1 && !ListInitialization) {
1031 Expr *Arg = Exprs[0];
1032 return BuildCXXFunctionalCastExpr(TInfo, LParenLoc, Arg, RParenLoc);
1035 QualType ElemTy = Ty;
1036 if (Ty->isArrayType()) {
1037 if (!ListInitialization)
1038 return ExprError(Diag(TyBeginLoc,
1039 diag::err_value_init_for_array_type) << FullRange);
1040 ElemTy = Context.getBaseElementType(Ty);
1043 if (!Ty->isVoidType() &&
1044 RequireCompleteType(TyBeginLoc, ElemTy,
1045 diag::err_invalid_incomplete_type_use, FullRange))
1048 if (RequireNonAbstractType(TyBeginLoc, Ty,
1049 diag::err_allocation_of_abstract_type))
1052 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TInfo);
1053 InitializationKind Kind =
1054 Exprs.size() ? ListInitialization
1055 ? InitializationKind::CreateDirectList(TyBeginLoc)
1056 : InitializationKind::CreateDirect(TyBeginLoc, LParenLoc, RParenLoc)
1057 : InitializationKind::CreateValue(TyBeginLoc, LParenLoc, RParenLoc);
1058 InitializationSequence InitSeq(*this, Entity, Kind, Exprs);
1059 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Exprs);
1061 if (Result.isInvalid() || !ListInitialization)
1064 Expr *Inner = Result.get();
1065 if (CXXBindTemporaryExpr *BTE = dyn_cast_or_null<CXXBindTemporaryExpr>(Inner))
1066 Inner = BTE->getSubExpr();
1067 if (!isa<CXXTemporaryObjectExpr>(Inner)) {
1068 // If we created a CXXTemporaryObjectExpr, that node also represents the
1069 // functional cast. Otherwise, create an explicit cast to represent
1070 // the syntactic form of a functional-style cast that was used here.
1072 // FIXME: Creating a CXXFunctionalCastExpr around a CXXConstructExpr
1073 // would give a more consistent AST representation than using a
1074 // CXXTemporaryObjectExpr. It's also weird that the functional cast
1075 // is sometimes handled by initialization and sometimes not.
1076 QualType ResultType = Result.get()->getType();
1077 Result = CXXFunctionalCastExpr::Create(
1078 Context, ResultType, Expr::getValueKindForType(TInfo->getType()), TInfo,
1079 CK_NoOp, Result.get(), /*Path=*/nullptr, LParenLoc, RParenLoc);
1085 /// doesUsualArrayDeleteWantSize - Answers whether the usual
1086 /// operator delete[] for the given type has a size_t parameter.
1087 static bool doesUsualArrayDeleteWantSize(Sema &S, SourceLocation loc,
1088 QualType allocType) {
1089 const RecordType *record =
1090 allocType->getBaseElementTypeUnsafe()->getAs<RecordType>();
1091 if (!record) return false;
1093 // Try to find an operator delete[] in class scope.
1095 DeclarationName deleteName =
1096 S.Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete);
1097 LookupResult ops(S, deleteName, loc, Sema::LookupOrdinaryName);
1098 S.LookupQualifiedName(ops, record->getDecl());
1100 // We're just doing this for information.
1101 ops.suppressDiagnostics();
1103 // Very likely: there's no operator delete[].
1104 if (ops.empty()) return false;
1106 // If it's ambiguous, it should be illegal to call operator delete[]
1107 // on this thing, so it doesn't matter if we allocate extra space or not.
1108 if (ops.isAmbiguous()) return false;
1110 LookupResult::Filter filter = ops.makeFilter();
1111 while (filter.hasNext()) {
1112 NamedDecl *del = filter.next()->getUnderlyingDecl();
1114 // C++0x [basic.stc.dynamic.deallocation]p2:
1115 // A template instance is never a usual deallocation function,
1116 // regardless of its signature.
1117 if (isa<FunctionTemplateDecl>(del)) {
1122 // C++0x [basic.stc.dynamic.deallocation]p2:
1123 // If class T does not declare [an operator delete[] with one
1124 // parameter] but does declare a member deallocation function
1125 // named operator delete[] with exactly two parameters, the
1126 // second of which has type std::size_t, then this function
1127 // is a usual deallocation function.
1128 if (!cast<CXXMethodDecl>(del)->isUsualDeallocationFunction()) {
1135 if (!ops.isSingleResult()) return false;
1137 const FunctionDecl *del = cast<FunctionDecl>(ops.getFoundDecl());
1138 return (del->getNumParams() == 2);
1141 /// \brief Parsed a C++ 'new' expression (C++ 5.3.4).
1144 /// @code new (memory) int[size][4] @endcode
1146 /// @code ::new Foo(23, "hello") @endcode
1148 /// \param StartLoc The first location of the expression.
1149 /// \param UseGlobal True if 'new' was prefixed with '::'.
1150 /// \param PlacementLParen Opening paren of the placement arguments.
1151 /// \param PlacementArgs Placement new arguments.
1152 /// \param PlacementRParen Closing paren of the placement arguments.
1153 /// \param TypeIdParens If the type is in parens, the source range.
1154 /// \param D The type to be allocated, as well as array dimensions.
1155 /// \param Initializer The initializing expression or initializer-list, or null
1156 /// if there is none.
1158 Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
1159 SourceLocation PlacementLParen, MultiExprArg PlacementArgs,
1160 SourceLocation PlacementRParen, SourceRange TypeIdParens,
1161 Declarator &D, Expr *Initializer) {
1162 bool TypeContainsAuto = D.getDeclSpec().containsPlaceholderType();
1164 Expr *ArraySize = nullptr;
1165 // If the specified type is an array, unwrap it and save the expression.
1166 if (D.getNumTypeObjects() > 0 &&
1167 D.getTypeObject(0).Kind == DeclaratorChunk::Array) {
1168 DeclaratorChunk &Chunk = D.getTypeObject(0);
1169 if (TypeContainsAuto)
1170 return ExprError(Diag(Chunk.Loc, diag::err_new_array_of_auto)
1171 << D.getSourceRange());
1172 if (Chunk.Arr.hasStatic)
1173 return ExprError(Diag(Chunk.Loc, diag::err_static_illegal_in_new)
1174 << D.getSourceRange());
1175 if (!Chunk.Arr.NumElts)
1176 return ExprError(Diag(Chunk.Loc, diag::err_array_new_needs_size)
1177 << D.getSourceRange());
1179 ArraySize = static_cast<Expr*>(Chunk.Arr.NumElts);
1180 D.DropFirstTypeObject();
1183 // Every dimension shall be of constant size.
1185 for (unsigned I = 0, N = D.getNumTypeObjects(); I < N; ++I) {
1186 if (D.getTypeObject(I).Kind != DeclaratorChunk::Array)
1189 DeclaratorChunk::ArrayTypeInfo &Array = D.getTypeObject(I).Arr;
1190 if (Expr *NumElts = (Expr *)Array.NumElts) {
1191 if (!NumElts->isTypeDependent() && !NumElts->isValueDependent()) {
1192 if (getLangOpts().CPlusPlus14) {
1193 // C++1y [expr.new]p6: Every constant-expression in a noptr-new-declarator
1194 // shall be a converted constant expression (5.19) of type std::size_t
1195 // and shall evaluate to a strictly positive value.
1196 unsigned IntWidth = Context.getTargetInfo().getIntWidth();
1197 assert(IntWidth && "Builtin type of size 0?");
1198 llvm::APSInt Value(IntWidth);
1200 = CheckConvertedConstantExpression(NumElts, Context.getSizeType(), Value,
1205 = VerifyIntegerConstantExpression(NumElts, nullptr,
1206 diag::err_new_array_nonconst)
1216 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, /*Scope=*/nullptr);
1217 QualType AllocType = TInfo->getType();
1218 if (D.isInvalidType())
1221 SourceRange DirectInitRange;
1222 if (ParenListExpr *List = dyn_cast_or_null<ParenListExpr>(Initializer))
1223 DirectInitRange = List->getSourceRange();
1225 return BuildCXXNew(SourceRange(StartLoc, D.getLocEnd()), UseGlobal,
1238 static bool isLegalArrayNewInitializer(CXXNewExpr::InitializationStyle Style,
1242 if (ParenListExpr *PLE = dyn_cast<ParenListExpr>(Init))
1243 return PLE->getNumExprs() == 0;
1244 if (isa<ImplicitValueInitExpr>(Init))
1246 else if (CXXConstructExpr *CCE = dyn_cast<CXXConstructExpr>(Init))
1247 return !CCE->isListInitialization() &&
1248 CCE->getConstructor()->isDefaultConstructor();
1249 else if (Style == CXXNewExpr::ListInit) {
1250 assert(isa<InitListExpr>(Init) &&
1251 "Shouldn't create list CXXConstructExprs for arrays.");
1258 Sema::BuildCXXNew(SourceRange Range, bool UseGlobal,
1259 SourceLocation PlacementLParen,
1260 MultiExprArg PlacementArgs,
1261 SourceLocation PlacementRParen,
1262 SourceRange TypeIdParens,
1264 TypeSourceInfo *AllocTypeInfo,
1266 SourceRange DirectInitRange,
1268 bool TypeMayContainAuto) {
1269 SourceRange TypeRange = AllocTypeInfo->getTypeLoc().getSourceRange();
1270 SourceLocation StartLoc = Range.getBegin();
1272 CXXNewExpr::InitializationStyle initStyle;
1273 if (DirectInitRange.isValid()) {
1274 assert(Initializer && "Have parens but no initializer.");
1275 initStyle = CXXNewExpr::CallInit;
1276 } else if (Initializer && isa<InitListExpr>(Initializer))
1277 initStyle = CXXNewExpr::ListInit;
1279 assert((!Initializer || isa<ImplicitValueInitExpr>(Initializer) ||
1280 isa<CXXConstructExpr>(Initializer)) &&
1281 "Initializer expression that cannot have been implicitly created.");
1282 initStyle = CXXNewExpr::NoInit;
1285 Expr **Inits = &Initializer;
1286 unsigned NumInits = Initializer ? 1 : 0;
1287 if (ParenListExpr *List = dyn_cast_or_null<ParenListExpr>(Initializer)) {
1288 assert(initStyle == CXXNewExpr::CallInit && "paren init for non-call init");
1289 Inits = List->getExprs();
1290 NumInits = List->getNumExprs();
1293 // C++11 [dcl.spec.auto]p6. Deduce the type which 'auto' stands in for.
1294 if (TypeMayContainAuto && AllocType->isUndeducedType()) {
1295 if (initStyle == CXXNewExpr::NoInit || NumInits == 0)
1296 return ExprError(Diag(StartLoc, diag::err_auto_new_requires_ctor_arg)
1297 << AllocType << TypeRange);
1298 if (initStyle == CXXNewExpr::ListInit ||
1299 (NumInits == 1 && isa<InitListExpr>(Inits[0])))
1300 return ExprError(Diag(Inits[0]->getLocStart(),
1301 diag::err_auto_new_list_init)
1302 << AllocType << TypeRange);
1304 Expr *FirstBad = Inits[1];
1305 return ExprError(Diag(FirstBad->getLocStart(),
1306 diag::err_auto_new_ctor_multiple_expressions)
1307 << AllocType << TypeRange);
1309 Expr *Deduce = Inits[0];
1310 QualType DeducedType;
1311 if (DeduceAutoType(AllocTypeInfo, Deduce, DeducedType) == DAR_Failed)
1312 return ExprError(Diag(StartLoc, diag::err_auto_new_deduction_failure)
1313 << AllocType << Deduce->getType()
1314 << TypeRange << Deduce->getSourceRange());
1315 if (DeducedType.isNull())
1317 AllocType = DeducedType;
1320 // Per C++0x [expr.new]p5, the type being constructed may be a
1321 // typedef of an array type.
1323 if (const ConstantArrayType *Array
1324 = Context.getAsConstantArrayType(AllocType)) {
1325 ArraySize = IntegerLiteral::Create(Context, Array->getSize(),
1326 Context.getSizeType(),
1327 TypeRange.getEnd());
1328 AllocType = Array->getElementType();
1332 if (CheckAllocatedType(AllocType, TypeRange.getBegin(), TypeRange))
1335 if (initStyle == CXXNewExpr::ListInit &&
1336 isStdInitializerList(AllocType, nullptr)) {
1337 Diag(AllocTypeInfo->getTypeLoc().getBeginLoc(),
1338 diag::warn_dangling_std_initializer_list)
1339 << /*at end of FE*/0 << Inits[0]->getSourceRange();
1342 // In ARC, infer 'retaining' for the allocated
1343 if (getLangOpts().ObjCAutoRefCount &&
1344 AllocType.getObjCLifetime() == Qualifiers::OCL_None &&
1345 AllocType->isObjCLifetimeType()) {
1346 AllocType = Context.getLifetimeQualifiedType(AllocType,
1347 AllocType->getObjCARCImplicitLifetime());
1350 QualType ResultType = Context.getPointerType(AllocType);
1352 if (ArraySize && ArraySize->getType()->isNonOverloadPlaceholderType()) {
1353 ExprResult result = CheckPlaceholderExpr(ArraySize);
1354 if (result.isInvalid()) return ExprError();
1355 ArraySize = result.get();
1357 // C++98 5.3.4p6: "The expression in a direct-new-declarator shall have
1358 // integral or enumeration type with a non-negative value."
1359 // C++11 [expr.new]p6: The expression [...] shall be of integral or unscoped
1360 // enumeration type, or a class type for which a single non-explicit
1361 // conversion function to integral or unscoped enumeration type exists.
1362 // C++1y [expr.new]p6: The expression [...] is implicitly converted to
1364 if (ArraySize && !ArraySize->isTypeDependent()) {
1365 ExprResult ConvertedSize;
1366 if (getLangOpts().CPlusPlus14) {
1367 assert(Context.getTargetInfo().getIntWidth() && "Builtin type of size 0?");
1369 ConvertedSize = PerformImplicitConversion(ArraySize, Context.getSizeType(),
1372 if (!ConvertedSize.isInvalid() &&
1373 ArraySize->getType()->getAs<RecordType>())
1374 // Diagnose the compatibility of this conversion.
1375 Diag(StartLoc, diag::warn_cxx98_compat_array_size_conversion)
1376 << ArraySize->getType() << 0 << "'size_t'";
1378 class SizeConvertDiagnoser : public ICEConvertDiagnoser {
1383 SizeConvertDiagnoser(Expr *ArraySize)
1384 : ICEConvertDiagnoser(/*AllowScopedEnumerations*/false, false, false),
1385 ArraySize(ArraySize) {}
1387 SemaDiagnosticBuilder diagnoseNotInt(Sema &S, SourceLocation Loc,
1388 QualType T) override {
1389 return S.Diag(Loc, diag::err_array_size_not_integral)
1390 << S.getLangOpts().CPlusPlus11 << T;
1393 SemaDiagnosticBuilder diagnoseIncomplete(
1394 Sema &S, SourceLocation Loc, QualType T) override {
1395 return S.Diag(Loc, diag::err_array_size_incomplete_type)
1396 << T << ArraySize->getSourceRange();
1399 SemaDiagnosticBuilder diagnoseExplicitConv(
1400 Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) override {
1401 return S.Diag(Loc, diag::err_array_size_explicit_conversion) << T << ConvTy;
1404 SemaDiagnosticBuilder noteExplicitConv(
1405 Sema &S, CXXConversionDecl *Conv, QualType ConvTy) override {
1406 return S.Diag(Conv->getLocation(), diag::note_array_size_conversion)
1407 << ConvTy->isEnumeralType() << ConvTy;
1410 SemaDiagnosticBuilder diagnoseAmbiguous(
1411 Sema &S, SourceLocation Loc, QualType T) override {
1412 return S.Diag(Loc, diag::err_array_size_ambiguous_conversion) << T;
1415 SemaDiagnosticBuilder noteAmbiguous(
1416 Sema &S, CXXConversionDecl *Conv, QualType ConvTy) override {
1417 return S.Diag(Conv->getLocation(), diag::note_array_size_conversion)
1418 << ConvTy->isEnumeralType() << ConvTy;
1421 SemaDiagnosticBuilder diagnoseConversion(Sema &S, SourceLocation Loc,
1423 QualType ConvTy) override {
1425 S.getLangOpts().CPlusPlus11
1426 ? diag::warn_cxx98_compat_array_size_conversion
1427 : diag::ext_array_size_conversion)
1428 << T << ConvTy->isEnumeralType() << ConvTy;
1430 } SizeDiagnoser(ArraySize);
1432 ConvertedSize = PerformContextualImplicitConversion(StartLoc, ArraySize,
1435 if (ConvertedSize.isInvalid())
1438 ArraySize = ConvertedSize.get();
1439 QualType SizeType = ArraySize->getType();
1441 if (!SizeType->isIntegralOrUnscopedEnumerationType())
1444 // C++98 [expr.new]p7:
1445 // The expression in a direct-new-declarator shall have integral type
1446 // with a non-negative value.
1448 // Let's see if this is a constant < 0. If so, we reject it out of
1449 // hand. Otherwise, if it's not a constant, we must have an unparenthesized
1452 // Note: such a construct has well-defined semantics in C++11: it throws
1453 // std::bad_array_new_length.
1454 if (!ArraySize->isValueDependent()) {
1456 // We've already performed any required implicit conversion to integer or
1457 // unscoped enumeration type.
1458 if (ArraySize->isIntegerConstantExpr(Value, Context)) {
1459 if (Value < llvm::APSInt(
1460 llvm::APInt::getNullValue(Value.getBitWidth()),
1461 Value.isUnsigned())) {
1462 if (getLangOpts().CPlusPlus11)
1463 Diag(ArraySize->getLocStart(),
1464 diag::warn_typecheck_negative_array_new_size)
1465 << ArraySize->getSourceRange();
1467 return ExprError(Diag(ArraySize->getLocStart(),
1468 diag::err_typecheck_negative_array_size)
1469 << ArraySize->getSourceRange());
1470 } else if (!AllocType->isDependentType()) {
1471 unsigned ActiveSizeBits =
1472 ConstantArrayType::getNumAddressingBits(Context, AllocType, Value);
1473 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
1474 if (getLangOpts().CPlusPlus11)
1475 Diag(ArraySize->getLocStart(),
1476 diag::warn_array_new_too_large)
1477 << Value.toString(10)
1478 << ArraySize->getSourceRange();
1480 return ExprError(Diag(ArraySize->getLocStart(),
1481 diag::err_array_too_large)
1482 << Value.toString(10)
1483 << ArraySize->getSourceRange());
1486 } else if (TypeIdParens.isValid()) {
1487 // Can't have dynamic array size when the type-id is in parentheses.
1488 Diag(ArraySize->getLocStart(), diag::ext_new_paren_array_nonconst)
1489 << ArraySize->getSourceRange()
1490 << FixItHint::CreateRemoval(TypeIdParens.getBegin())
1491 << FixItHint::CreateRemoval(TypeIdParens.getEnd());
1493 TypeIdParens = SourceRange();
1497 // Note that we do *not* convert the argument in any way. It can
1498 // be signed, larger than size_t, whatever.
1501 FunctionDecl *OperatorNew = nullptr;
1502 FunctionDecl *OperatorDelete = nullptr;
1504 if (!AllocType->isDependentType() &&
1505 !Expr::hasAnyTypeDependentArguments(PlacementArgs) &&
1506 FindAllocationFunctions(StartLoc,
1507 SourceRange(PlacementLParen, PlacementRParen),
1508 UseGlobal, AllocType, ArraySize, PlacementArgs,
1509 OperatorNew, OperatorDelete))
1512 // If this is an array allocation, compute whether the usual array
1513 // deallocation function for the type has a size_t parameter.
1514 bool UsualArrayDeleteWantsSize = false;
1515 if (ArraySize && !AllocType->isDependentType())
1516 UsualArrayDeleteWantsSize
1517 = doesUsualArrayDeleteWantSize(*this, StartLoc, AllocType);
1519 SmallVector<Expr *, 8> AllPlaceArgs;
1521 const FunctionProtoType *Proto =
1522 OperatorNew->getType()->getAs<FunctionProtoType>();
1523 VariadicCallType CallType = Proto->isVariadic() ? VariadicFunction
1524 : VariadicDoesNotApply;
1526 // We've already converted the placement args, just fill in any default
1527 // arguments. Skip the first parameter because we don't have a corresponding
1529 if (GatherArgumentsForCall(PlacementLParen, OperatorNew, Proto, 1,
1530 PlacementArgs, AllPlaceArgs, CallType))
1533 if (!AllPlaceArgs.empty())
1534 PlacementArgs = AllPlaceArgs;
1536 // FIXME: This is wrong: PlacementArgs misses out the first (size) argument.
1537 DiagnoseSentinelCalls(OperatorNew, PlacementLParen, PlacementArgs);
1539 // FIXME: Missing call to CheckFunctionCall or equivalent
1542 // Warn if the type is over-aligned and is being allocated by global operator
1544 if (PlacementArgs.empty() && OperatorNew &&
1545 (OperatorNew->isImplicit() ||
1546 getSourceManager().isInSystemHeader(OperatorNew->getLocStart()))) {
1547 if (unsigned Align = Context.getPreferredTypeAlign(AllocType.getTypePtr())){
1548 unsigned SuitableAlign = Context.getTargetInfo().getSuitableAlign();
1549 if (Align > SuitableAlign)
1550 Diag(StartLoc, diag::warn_overaligned_type)
1552 << unsigned(Align / Context.getCharWidth())
1553 << unsigned(SuitableAlign / Context.getCharWidth());
1557 QualType InitType = AllocType;
1558 // Array 'new' can't have any initializers except empty parentheses.
1559 // Initializer lists are also allowed, in C++11. Rely on the parser for the
1560 // dialect distinction.
1561 if (ResultType->isArrayType() || ArraySize) {
1562 if (!isLegalArrayNewInitializer(initStyle, Initializer)) {
1563 SourceRange InitRange(Inits[0]->getLocStart(),
1564 Inits[NumInits - 1]->getLocEnd());
1565 Diag(StartLoc, diag::err_new_array_init_args) << InitRange;
1568 if (InitListExpr *ILE = dyn_cast_or_null<InitListExpr>(Initializer)) {
1569 // We do the initialization typechecking against the array type
1570 // corresponding to the number of initializers + 1 (to also check
1571 // default-initialization).
1572 unsigned NumElements = ILE->getNumInits() + 1;
1573 InitType = Context.getConstantArrayType(AllocType,
1574 llvm::APInt(Context.getTypeSize(Context.getSizeType()), NumElements),
1575 ArrayType::Normal, 0);
1579 // If we can perform the initialization, and we've not already done so,
1581 if (!AllocType->isDependentType() &&
1582 !Expr::hasAnyTypeDependentArguments(
1583 llvm::makeArrayRef(Inits, NumInits))) {
1584 // C++11 [expr.new]p15:
1585 // A new-expression that creates an object of type T initializes that
1586 // object as follows:
1587 InitializationKind Kind
1588 // - If the new-initializer is omitted, the object is default-
1589 // initialized (8.5); if no initialization is performed,
1590 // the object has indeterminate value
1591 = initStyle == CXXNewExpr::NoInit
1592 ? InitializationKind::CreateDefault(TypeRange.getBegin())
1593 // - Otherwise, the new-initializer is interpreted according to the
1594 // initialization rules of 8.5 for direct-initialization.
1595 : initStyle == CXXNewExpr::ListInit
1596 ? InitializationKind::CreateDirectList(TypeRange.getBegin())
1597 : InitializationKind::CreateDirect(TypeRange.getBegin(),
1598 DirectInitRange.getBegin(),
1599 DirectInitRange.getEnd());
1601 InitializedEntity Entity
1602 = InitializedEntity::InitializeNew(StartLoc, InitType);
1603 InitializationSequence InitSeq(*this, Entity, Kind, MultiExprArg(Inits, NumInits));
1604 ExprResult FullInit = InitSeq.Perform(*this, Entity, Kind,
1605 MultiExprArg(Inits, NumInits));
1606 if (FullInit.isInvalid())
1609 // FullInit is our initializer; strip off CXXBindTemporaryExprs, because
1610 // we don't want the initialized object to be destructed.
1611 if (CXXBindTemporaryExpr *Binder =
1612 dyn_cast_or_null<CXXBindTemporaryExpr>(FullInit.get()))
1613 FullInit = Binder->getSubExpr();
1615 Initializer = FullInit.get();
1618 // Mark the new and delete operators as referenced.
1620 if (DiagnoseUseOfDecl(OperatorNew, StartLoc))
1622 MarkFunctionReferenced(StartLoc, OperatorNew);
1624 if (OperatorDelete) {
1625 if (DiagnoseUseOfDecl(OperatorDelete, StartLoc))
1627 MarkFunctionReferenced(StartLoc, OperatorDelete);
1630 // C++0x [expr.new]p17:
1631 // If the new expression creates an array of objects of class type,
1632 // access and ambiguity control are done for the destructor.
1633 QualType BaseAllocType = Context.getBaseElementType(AllocType);
1634 if (ArraySize && !BaseAllocType->isDependentType()) {
1635 if (const RecordType *BaseRecordType = BaseAllocType->getAs<RecordType>()) {
1636 if (CXXDestructorDecl *dtor = LookupDestructor(
1637 cast<CXXRecordDecl>(BaseRecordType->getDecl()))) {
1638 MarkFunctionReferenced(StartLoc, dtor);
1639 CheckDestructorAccess(StartLoc, dtor,
1640 PDiag(diag::err_access_dtor)
1642 if (DiagnoseUseOfDecl(dtor, StartLoc))
1648 return new (Context)
1649 CXXNewExpr(Context, UseGlobal, OperatorNew, OperatorDelete,
1650 UsualArrayDeleteWantsSize, PlacementArgs, TypeIdParens,
1651 ArraySize, initStyle, Initializer, ResultType, AllocTypeInfo,
1652 Range, DirectInitRange);
1655 /// \brief Checks that a type is suitable as the allocated type
1656 /// in a new-expression.
1657 bool Sema::CheckAllocatedType(QualType AllocType, SourceLocation Loc,
1659 // C++ 5.3.4p1: "[The] type shall be a complete object type, but not an
1660 // abstract class type or array thereof.
1661 if (AllocType->isFunctionType())
1662 return Diag(Loc, diag::err_bad_new_type)
1663 << AllocType << 0 << R;
1664 else if (AllocType->isReferenceType())
1665 return Diag(Loc, diag::err_bad_new_type)
1666 << AllocType << 1 << R;
1667 else if (!AllocType->isDependentType() &&
1668 RequireCompleteType(Loc, AllocType, diag::err_new_incomplete_type,R))
1670 else if (RequireNonAbstractType(Loc, AllocType,
1671 diag::err_allocation_of_abstract_type))
1673 else if (AllocType->isVariablyModifiedType())
1674 return Diag(Loc, diag::err_variably_modified_new_type)
1676 else if (unsigned AddressSpace = AllocType.getAddressSpace())
1677 return Diag(Loc, diag::err_address_space_qualified_new)
1678 << AllocType.getUnqualifiedType() << AddressSpace;
1679 else if (getLangOpts().ObjCAutoRefCount) {
1680 if (const ArrayType *AT = Context.getAsArrayType(AllocType)) {
1681 QualType BaseAllocType = Context.getBaseElementType(AT);
1682 if (BaseAllocType.getObjCLifetime() == Qualifiers::OCL_None &&
1683 BaseAllocType->isObjCLifetimeType())
1684 return Diag(Loc, diag::err_arc_new_array_without_ownership)
1692 /// \brief Determine whether the given function is a non-placement
1693 /// deallocation function.
1694 static bool isNonPlacementDeallocationFunction(Sema &S, FunctionDecl *FD) {
1695 if (FD->isInvalidDecl())
1698 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD))
1699 return Method->isUsualDeallocationFunction();
1701 if (FD->getOverloadedOperator() != OO_Delete &&
1702 FD->getOverloadedOperator() != OO_Array_Delete)
1705 if (FD->getNumParams() == 1)
1708 return S.getLangOpts().SizedDeallocation && FD->getNumParams() == 2 &&
1709 S.Context.hasSameUnqualifiedType(FD->getParamDecl(1)->getType(),
1710 S.Context.getSizeType());
1713 /// FindAllocationFunctions - Finds the overloads of operator new and delete
1714 /// that are appropriate for the allocation.
1715 bool Sema::FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
1716 bool UseGlobal, QualType AllocType,
1717 bool IsArray, MultiExprArg PlaceArgs,
1718 FunctionDecl *&OperatorNew,
1719 FunctionDecl *&OperatorDelete) {
1720 // --- Choosing an allocation function ---
1721 // C++ 5.3.4p8 - 14 & 18
1722 // 1) If UseGlobal is true, only look in the global scope. Else, also look
1723 // in the scope of the allocated class.
1724 // 2) If an array size is given, look for operator new[], else look for
1726 // 3) The first argument is always size_t. Append the arguments from the
1729 SmallVector<Expr*, 8> AllocArgs(1 + PlaceArgs.size());
1730 // We don't care about the actual value of this argument.
1731 // FIXME: Should the Sema create the expression and embed it in the syntax
1732 // tree? Or should the consumer just recalculate the value?
1733 IntegerLiteral Size(Context, llvm::APInt::getNullValue(
1734 Context.getTargetInfo().getPointerWidth(0)),
1735 Context.getSizeType(),
1737 AllocArgs[0] = &Size;
1738 std::copy(PlaceArgs.begin(), PlaceArgs.end(), AllocArgs.begin() + 1);
1740 // C++ [expr.new]p8:
1741 // If the allocated type is a non-array type, the allocation
1742 // function's name is operator new and the deallocation function's
1743 // name is operator delete. If the allocated type is an array
1744 // type, the allocation function's name is operator new[] and the
1745 // deallocation function's name is operator delete[].
1746 DeclarationName NewName = Context.DeclarationNames.getCXXOperatorName(
1747 IsArray ? OO_Array_New : OO_New);
1748 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
1749 IsArray ? OO_Array_Delete : OO_Delete);
1751 QualType AllocElemType = Context.getBaseElementType(AllocType);
1753 if (AllocElemType->isRecordType() && !UseGlobal) {
1754 CXXRecordDecl *Record
1755 = cast<CXXRecordDecl>(AllocElemType->getAs<RecordType>()->getDecl());
1756 if (FindAllocationOverload(StartLoc, Range, NewName, AllocArgs, Record,
1757 /*AllowMissing=*/true, OperatorNew))
1762 // Didn't find a member overload. Look for a global one.
1763 DeclareGlobalNewDelete();
1764 DeclContext *TUDecl = Context.getTranslationUnitDecl();
1765 bool FallbackEnabled = IsArray && Context.getLangOpts().MSVCCompat;
1766 if (FindAllocationOverload(StartLoc, Range, NewName, AllocArgs, TUDecl,
1767 /*AllowMissing=*/FallbackEnabled, OperatorNew,
1768 /*Diagnose=*/!FallbackEnabled)) {
1769 if (!FallbackEnabled)
1772 // MSVC will fall back on trying to find a matching global operator new
1773 // if operator new[] cannot be found. Also, MSVC will leak by not
1774 // generating a call to operator delete or operator delete[], but we
1775 // will not replicate that bug.
1776 NewName = Context.DeclarationNames.getCXXOperatorName(OO_New);
1777 DeleteName = Context.DeclarationNames.getCXXOperatorName(OO_Delete);
1778 if (FindAllocationOverload(StartLoc, Range, NewName, AllocArgs, TUDecl,
1779 /*AllowMissing=*/false, OperatorNew))
1784 // We don't need an operator delete if we're running under
1786 if (!getLangOpts().Exceptions) {
1787 OperatorDelete = nullptr;
1791 // C++ [expr.new]p19:
1793 // If the new-expression begins with a unary :: operator, the
1794 // deallocation function's name is looked up in the global
1795 // scope. Otherwise, if the allocated type is a class type T or an
1796 // array thereof, the deallocation function's name is looked up in
1797 // the scope of T. If this lookup fails to find the name, or if
1798 // the allocated type is not a class type or array thereof, the
1799 // deallocation function's name is looked up in the global scope.
1800 LookupResult FoundDelete(*this, DeleteName, StartLoc, LookupOrdinaryName);
1801 if (AllocElemType->isRecordType() && !UseGlobal) {
1803 = cast<CXXRecordDecl>(AllocElemType->getAs<RecordType>()->getDecl());
1804 LookupQualifiedName(FoundDelete, RD);
1806 if (FoundDelete.isAmbiguous())
1807 return true; // FIXME: clean up expressions?
1809 if (FoundDelete.empty()) {
1810 DeclareGlobalNewDelete();
1811 LookupQualifiedName(FoundDelete, Context.getTranslationUnitDecl());
1814 FoundDelete.suppressDiagnostics();
1816 SmallVector<std::pair<DeclAccessPair,FunctionDecl*>, 2> Matches;
1818 // Whether we're looking for a placement operator delete is dictated
1819 // by whether we selected a placement operator new, not by whether
1820 // we had explicit placement arguments. This matters for things like
1821 // struct A { void *operator new(size_t, int = 0); ... };
1823 bool isPlacementNew = (!PlaceArgs.empty() || OperatorNew->param_size() != 1);
1825 if (isPlacementNew) {
1826 // C++ [expr.new]p20:
1827 // A declaration of a placement deallocation function matches the
1828 // declaration of a placement allocation function if it has the
1829 // same number of parameters and, after parameter transformations
1830 // (8.3.5), all parameter types except the first are
1833 // To perform this comparison, we compute the function type that
1834 // the deallocation function should have, and use that type both
1835 // for template argument deduction and for comparison purposes.
1837 // FIXME: this comparison should ignore CC and the like.
1838 QualType ExpectedFunctionType;
1840 const FunctionProtoType *Proto
1841 = OperatorNew->getType()->getAs<FunctionProtoType>();
1843 SmallVector<QualType, 4> ArgTypes;
1844 ArgTypes.push_back(Context.VoidPtrTy);
1845 for (unsigned I = 1, N = Proto->getNumParams(); I < N; ++I)
1846 ArgTypes.push_back(Proto->getParamType(I));
1848 FunctionProtoType::ExtProtoInfo EPI;
1849 EPI.Variadic = Proto->isVariadic();
1851 ExpectedFunctionType
1852 = Context.getFunctionType(Context.VoidTy, ArgTypes, EPI);
1855 for (LookupResult::iterator D = FoundDelete.begin(),
1856 DEnd = FoundDelete.end();
1858 FunctionDecl *Fn = nullptr;
1859 if (FunctionTemplateDecl *FnTmpl
1860 = dyn_cast<FunctionTemplateDecl>((*D)->getUnderlyingDecl())) {
1861 // Perform template argument deduction to try to match the
1862 // expected function type.
1863 TemplateDeductionInfo Info(StartLoc);
1864 if (DeduceTemplateArguments(FnTmpl, nullptr, ExpectedFunctionType, Fn,
1868 Fn = cast<FunctionDecl>((*D)->getUnderlyingDecl());
1870 if (Context.hasSameType(Fn->getType(), ExpectedFunctionType))
1871 Matches.push_back(std::make_pair(D.getPair(), Fn));
1874 // C++ [expr.new]p20:
1875 // [...] Any non-placement deallocation function matches a
1876 // non-placement allocation function. [...]
1877 for (LookupResult::iterator D = FoundDelete.begin(),
1878 DEnd = FoundDelete.end();
1880 if (FunctionDecl *Fn = dyn_cast<FunctionDecl>((*D)->getUnderlyingDecl()))
1881 if (isNonPlacementDeallocationFunction(*this, Fn))
1882 Matches.push_back(std::make_pair(D.getPair(), Fn));
1885 // C++1y [expr.new]p22:
1886 // For a non-placement allocation function, the normal deallocation
1887 // function lookup is used
1888 // C++1y [expr.delete]p?:
1889 // If [...] deallocation function lookup finds both a usual deallocation
1890 // function with only a pointer parameter and a usual deallocation
1891 // function with both a pointer parameter and a size parameter, then the
1892 // selected deallocation function shall be the one with two parameters.
1893 // Otherwise, the selected deallocation function shall be the function
1894 // with one parameter.
1895 if (getLangOpts().SizedDeallocation && Matches.size() == 2) {
1896 if (Matches[0].second->getNumParams() == 1)
1897 Matches.erase(Matches.begin());
1899 Matches.erase(Matches.begin() + 1);
1900 assert(Matches[0].second->getNumParams() == 2 &&
1901 "found an unexpected usual deallocation function");
1905 // C++ [expr.new]p20:
1906 // [...] If the lookup finds a single matching deallocation
1907 // function, that function will be called; otherwise, no
1908 // deallocation function will be called.
1909 if (Matches.size() == 1) {
1910 OperatorDelete = Matches[0].second;
1912 // C++0x [expr.new]p20:
1913 // If the lookup finds the two-parameter form of a usual
1914 // deallocation function (3.7.4.2) and that function, considered
1915 // as a placement deallocation function, would have been
1916 // selected as a match for the allocation function, the program
1918 if (!PlaceArgs.empty() && getLangOpts().CPlusPlus11 &&
1919 isNonPlacementDeallocationFunction(*this, OperatorDelete)) {
1920 Diag(StartLoc, diag::err_placement_new_non_placement_delete)
1921 << SourceRange(PlaceArgs.front()->getLocStart(),
1922 PlaceArgs.back()->getLocEnd());
1923 if (!OperatorDelete->isImplicit())
1924 Diag(OperatorDelete->getLocation(), diag::note_previous_decl)
1927 CheckAllocationAccess(StartLoc, Range, FoundDelete.getNamingClass(),
1935 /// \brief Find an fitting overload for the allocation function
1936 /// in the specified scope.
1938 /// \param StartLoc The location of the 'new' token.
1939 /// \param Range The range of the placement arguments.
1940 /// \param Name The name of the function ('operator new' or 'operator new[]').
1941 /// \param Args The placement arguments specified.
1942 /// \param Ctx The scope in which we should search; either a class scope or the
1943 /// translation unit.
1944 /// \param AllowMissing If \c true, report an error if we can't find any
1945 /// allocation functions. Otherwise, succeed but don't fill in \p
1947 /// \param Operator Filled in with the found allocation function. Unchanged if
1948 /// no allocation function was found.
1949 /// \param Diagnose If \c true, issue errors if the allocation function is not
1951 bool Sema::FindAllocationOverload(SourceLocation StartLoc, SourceRange Range,
1952 DeclarationName Name, MultiExprArg Args,
1954 bool AllowMissing, FunctionDecl *&Operator,
1956 LookupResult R(*this, Name, StartLoc, LookupOrdinaryName);
1957 LookupQualifiedName(R, Ctx);
1959 if (AllowMissing || !Diagnose)
1961 return Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
1965 if (R.isAmbiguous())
1968 R.suppressDiagnostics();
1970 OverloadCandidateSet Candidates(StartLoc, OverloadCandidateSet::CSK_Normal);
1971 for (LookupResult::iterator Alloc = R.begin(), AllocEnd = R.end();
1972 Alloc != AllocEnd; ++Alloc) {
1973 // Even member operator new/delete are implicitly treated as
1974 // static, so don't use AddMemberCandidate.
1975 NamedDecl *D = (*Alloc)->getUnderlyingDecl();
1977 if (FunctionTemplateDecl *FnTemplate = dyn_cast<FunctionTemplateDecl>(D)) {
1978 AddTemplateOverloadCandidate(FnTemplate, Alloc.getPair(),
1979 /*ExplicitTemplateArgs=*/nullptr,
1981 /*SuppressUserConversions=*/false);
1985 FunctionDecl *Fn = cast<FunctionDecl>(D);
1986 AddOverloadCandidate(Fn, Alloc.getPair(), Args, Candidates,
1987 /*SuppressUserConversions=*/false);
1990 // Do the resolution.
1991 OverloadCandidateSet::iterator Best;
1992 switch (Candidates.BestViableFunction(*this, StartLoc, Best)) {
1995 FunctionDecl *FnDecl = Best->Function;
1996 if (CheckAllocationAccess(StartLoc, Range, R.getNamingClass(),
1997 Best->FoundDecl, Diagnose) == AR_inaccessible)
2004 case OR_No_Viable_Function:
2006 Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
2008 Candidates.NoteCandidates(*this, OCD_AllCandidates, Args);
2014 Diag(StartLoc, diag::err_ovl_ambiguous_call)
2016 Candidates.NoteCandidates(*this, OCD_ViableCandidates, Args);
2022 Diag(StartLoc, diag::err_ovl_deleted_call)
2023 << Best->Function->isDeleted()
2025 << getDeletedOrUnavailableSuffix(Best->Function)
2027 Candidates.NoteCandidates(*this, OCD_AllCandidates, Args);
2032 llvm_unreachable("Unreachable, bad result from BestViableFunction");
2036 /// DeclareGlobalNewDelete - Declare the global forms of operator new and
2037 /// delete. These are:
2040 /// void* operator new(std::size_t) throw(std::bad_alloc);
2041 /// void* operator new[](std::size_t) throw(std::bad_alloc);
2042 /// void operator delete(void *) throw();
2043 /// void operator delete[](void *) throw();
2045 /// void* operator new(std::size_t);
2046 /// void* operator new[](std::size_t);
2047 /// void operator delete(void *) noexcept;
2048 /// void operator delete[](void *) noexcept;
2050 /// void* operator new(std::size_t);
2051 /// void* operator new[](std::size_t);
2052 /// void operator delete(void *) noexcept;
2053 /// void operator delete[](void *) noexcept;
2054 /// void operator delete(void *, std::size_t) noexcept;
2055 /// void operator delete[](void *, std::size_t) noexcept;
2057 /// Note that the placement and nothrow forms of new are *not* implicitly
2058 /// declared. Their use requires including \<new\>.
2059 void Sema::DeclareGlobalNewDelete() {
2060 if (GlobalNewDeleteDeclared)
2063 // C++ [basic.std.dynamic]p2:
2064 // [...] The following allocation and deallocation functions (18.4) are
2065 // implicitly declared in global scope in each translation unit of a
2069 // void* operator new(std::size_t) throw(std::bad_alloc);
2070 // void* operator new[](std::size_t) throw(std::bad_alloc);
2071 // void operator delete(void*) throw();
2072 // void operator delete[](void*) throw();
2074 // void* operator new(std::size_t);
2075 // void* operator new[](std::size_t);
2076 // void operator delete(void*) noexcept;
2077 // void operator delete[](void*) noexcept;
2079 // void* operator new(std::size_t);
2080 // void* operator new[](std::size_t);
2081 // void operator delete(void*) noexcept;
2082 // void operator delete[](void*) noexcept;
2083 // void operator delete(void*, std::size_t) noexcept;
2084 // void operator delete[](void*, std::size_t) noexcept;
2086 // These implicit declarations introduce only the function names operator
2087 // new, operator new[], operator delete, operator delete[].
2089 // Here, we need to refer to std::bad_alloc, so we will implicitly declare
2090 // "std" or "bad_alloc" as necessary to form the exception specification.
2091 // However, we do not make these implicit declarations visible to name
2093 if (!StdBadAlloc && !getLangOpts().CPlusPlus11) {
2094 // The "std::bad_alloc" class has not yet been declared, so build it
2096 StdBadAlloc = CXXRecordDecl::Create(Context, TTK_Class,
2097 getOrCreateStdNamespace(),
2098 SourceLocation(), SourceLocation(),
2099 &PP.getIdentifierTable().get("bad_alloc"),
2101 getStdBadAlloc()->setImplicit(true);
2104 GlobalNewDeleteDeclared = true;
2106 QualType VoidPtr = Context.getPointerType(Context.VoidTy);
2107 QualType SizeT = Context.getSizeType();
2108 bool AssumeSaneOperatorNew = getLangOpts().AssumeSaneOperatorNew;
2110 DeclareGlobalAllocationFunction(
2111 Context.DeclarationNames.getCXXOperatorName(OO_New),
2112 VoidPtr, SizeT, QualType(), AssumeSaneOperatorNew);
2113 DeclareGlobalAllocationFunction(
2114 Context.DeclarationNames.getCXXOperatorName(OO_Array_New),
2115 VoidPtr, SizeT, QualType(), AssumeSaneOperatorNew);
2116 DeclareGlobalAllocationFunction(
2117 Context.DeclarationNames.getCXXOperatorName(OO_Delete),
2118 Context.VoidTy, VoidPtr);
2119 DeclareGlobalAllocationFunction(
2120 Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete),
2121 Context.VoidTy, VoidPtr);
2122 if (getLangOpts().SizedDeallocation) {
2123 DeclareGlobalAllocationFunction(
2124 Context.DeclarationNames.getCXXOperatorName(OO_Delete),
2125 Context.VoidTy, VoidPtr, Context.getSizeType());
2126 DeclareGlobalAllocationFunction(
2127 Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete),
2128 Context.VoidTy, VoidPtr, Context.getSizeType());
2132 /// DeclareGlobalAllocationFunction - Declares a single implicit global
2133 /// allocation function if it doesn't already exist.
2134 void Sema::DeclareGlobalAllocationFunction(DeclarationName Name,
2136 QualType Param1, QualType Param2,
2137 bool AddRestrictAttr) {
2138 DeclContext *GlobalCtx = Context.getTranslationUnitDecl();
2139 unsigned NumParams = Param2.isNull() ? 1 : 2;
2141 // Check if this function is already declared.
2142 DeclContext::lookup_result R = GlobalCtx->lookup(Name);
2143 for (DeclContext::lookup_iterator Alloc = R.begin(), AllocEnd = R.end();
2144 Alloc != AllocEnd; ++Alloc) {
2145 // Only look at non-template functions, as it is the predefined,
2146 // non-templated allocation function we are trying to declare here.
2147 if (FunctionDecl *Func = dyn_cast<FunctionDecl>(*Alloc)) {
2148 if (Func->getNumParams() == NumParams) {
2149 QualType InitialParam1Type =
2150 Context.getCanonicalType(Func->getParamDecl(0)
2151 ->getType().getUnqualifiedType());
2152 QualType InitialParam2Type =
2154 ? Context.getCanonicalType(Func->getParamDecl(1)
2155 ->getType().getUnqualifiedType())
2157 // FIXME: Do we need to check for default arguments here?
2158 if (InitialParam1Type == Param1 &&
2159 (NumParams == 1 || InitialParam2Type == Param2)) {
2160 if (AddRestrictAttr && !Func->hasAttr<RestrictAttr>())
2161 Func->addAttr(RestrictAttr::CreateImplicit(
2162 Context, RestrictAttr::GNU_malloc));
2163 // Make the function visible to name lookup, even if we found it in
2164 // an unimported module. It either is an implicitly-declared global
2165 // allocation function, or is suppressing that function.
2166 Func->setHidden(false);
2173 FunctionProtoType::ExtProtoInfo EPI;
2175 QualType BadAllocType;
2176 bool HasBadAllocExceptionSpec
2177 = (Name.getCXXOverloadedOperator() == OO_New ||
2178 Name.getCXXOverloadedOperator() == OO_Array_New);
2179 if (HasBadAllocExceptionSpec) {
2180 if (!getLangOpts().CPlusPlus11) {
2181 BadAllocType = Context.getTypeDeclType(getStdBadAlloc());
2182 assert(StdBadAlloc && "Must have std::bad_alloc declared");
2183 EPI.ExceptionSpec.Type = EST_Dynamic;
2184 EPI.ExceptionSpec.Exceptions = llvm::makeArrayRef(BadAllocType);
2188 getLangOpts().CPlusPlus11 ? EST_BasicNoexcept : EST_DynamicNone;
2191 QualType Params[] = { Param1, Param2 };
2193 QualType FnType = Context.getFunctionType(
2194 Return, llvm::makeArrayRef(Params, NumParams), EPI);
2195 FunctionDecl *Alloc =
2196 FunctionDecl::Create(Context, GlobalCtx, SourceLocation(),
2197 SourceLocation(), Name,
2198 FnType, /*TInfo=*/nullptr, SC_None, false, true);
2199 Alloc->setImplicit();
2201 // Implicit sized deallocation functions always have default visibility.
2202 Alloc->addAttr(VisibilityAttr::CreateImplicit(Context,
2203 VisibilityAttr::Default));
2205 if (AddRestrictAttr)
2207 RestrictAttr::CreateImplicit(Context, RestrictAttr::GNU_malloc));
2209 ParmVarDecl *ParamDecls[2];
2210 for (unsigned I = 0; I != NumParams; ++I) {
2211 ParamDecls[I] = ParmVarDecl::Create(Context, Alloc, SourceLocation(),
2212 SourceLocation(), nullptr,
2213 Params[I], /*TInfo=*/nullptr,
2215 ParamDecls[I]->setImplicit();
2217 Alloc->setParams(llvm::makeArrayRef(ParamDecls, NumParams));
2219 Context.getTranslationUnitDecl()->addDecl(Alloc);
2220 IdResolver.tryAddTopLevelDecl(Alloc, Name);
2223 FunctionDecl *Sema::FindUsualDeallocationFunction(SourceLocation StartLoc,
2224 bool CanProvideSize,
2225 DeclarationName Name) {
2226 DeclareGlobalNewDelete();
2228 LookupResult FoundDelete(*this, Name, StartLoc, LookupOrdinaryName);
2229 LookupQualifiedName(FoundDelete, Context.getTranslationUnitDecl());
2231 // C++ [expr.new]p20:
2232 // [...] Any non-placement deallocation function matches a
2233 // non-placement allocation function. [...]
2234 llvm::SmallVector<FunctionDecl*, 2> Matches;
2235 for (LookupResult::iterator D = FoundDelete.begin(),
2236 DEnd = FoundDelete.end();
2238 if (FunctionDecl *Fn = dyn_cast<FunctionDecl>(*D))
2239 if (isNonPlacementDeallocationFunction(*this, Fn))
2240 Matches.push_back(Fn);
2243 // C++1y [expr.delete]p?:
2244 // If the type is complete and deallocation function lookup finds both a
2245 // usual deallocation function with only a pointer parameter and a usual
2246 // deallocation function with both a pointer parameter and a size
2247 // parameter, then the selected deallocation function shall be the one
2248 // with two parameters. Otherwise, the selected deallocation function
2249 // shall be the function with one parameter.
2250 if (getLangOpts().SizedDeallocation && Matches.size() == 2) {
2251 unsigned NumArgs = CanProvideSize ? 2 : 1;
2252 if (Matches[0]->getNumParams() != NumArgs)
2253 Matches.erase(Matches.begin());
2255 Matches.erase(Matches.begin() + 1);
2256 assert(Matches[0]->getNumParams() == NumArgs &&
2257 "found an unexpected usual deallocation function");
2260 assert(Matches.size() == 1 &&
2261 "unexpectedly have multiple usual deallocation functions");
2262 return Matches.front();
2265 bool Sema::FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD,
2266 DeclarationName Name,
2267 FunctionDecl* &Operator, bool Diagnose) {
2268 LookupResult Found(*this, Name, StartLoc, LookupOrdinaryName);
2269 // Try to find operator delete/operator delete[] in class scope.
2270 LookupQualifiedName(Found, RD);
2272 if (Found.isAmbiguous())
2275 Found.suppressDiagnostics();
2277 SmallVector<DeclAccessPair,4> Matches;
2278 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end();
2280 NamedDecl *ND = (*F)->getUnderlyingDecl();
2282 // Ignore template operator delete members from the check for a usual
2283 // deallocation function.
2284 if (isa<FunctionTemplateDecl>(ND))
2287 if (cast<CXXMethodDecl>(ND)->isUsualDeallocationFunction())
2288 Matches.push_back(F.getPair());
2291 // There's exactly one suitable operator; pick it.
2292 if (Matches.size() == 1) {
2293 Operator = cast<CXXMethodDecl>(Matches[0]->getUnderlyingDecl());
2295 if (Operator->isDeleted()) {
2297 Diag(StartLoc, diag::err_deleted_function_use);
2298 NoteDeletedFunction(Operator);
2303 if (CheckAllocationAccess(StartLoc, SourceRange(), Found.getNamingClass(),
2304 Matches[0], Diagnose) == AR_inaccessible)
2309 // We found multiple suitable operators; complain about the ambiguity.
2310 } else if (!Matches.empty()) {
2312 Diag(StartLoc, diag::err_ambiguous_suitable_delete_member_function_found)
2315 for (SmallVectorImpl<DeclAccessPair>::iterator
2316 F = Matches.begin(), FEnd = Matches.end(); F != FEnd; ++F)
2317 Diag((*F)->getUnderlyingDecl()->getLocation(),
2318 diag::note_member_declared_here) << Name;
2323 // We did find operator delete/operator delete[] declarations, but
2324 // none of them were suitable.
2325 if (!Found.empty()) {
2327 Diag(StartLoc, diag::err_no_suitable_delete_member_function_found)
2330 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end();
2332 Diag((*F)->getUnderlyingDecl()->getLocation(),
2333 diag::note_member_declared_here) << Name;
2343 /// \brief Checks whether delete-expression, and new-expression used for
2344 /// initializing deletee have the same array form.
2345 class MismatchingNewDeleteDetector {
2347 enum MismatchResult {
2348 /// Indicates that there is no mismatch or a mismatch cannot be proven.
2350 /// Indicates that variable is initialized with mismatching form of \a new.
2352 /// Indicates that member is initialized with mismatching form of \a new.
2353 MemberInitMismatches,
2354 /// Indicates that 1 or more constructors' definitions could not been
2355 /// analyzed, and they will be checked again at the end of translation unit.
2359 /// \param EndOfTU True, if this is the final analysis at the end of
2360 /// translation unit. False, if this is the initial analysis at the point
2361 /// delete-expression was encountered.
2362 explicit MismatchingNewDeleteDetector(bool EndOfTU)
2363 : IsArrayForm(false), Field(nullptr), EndOfTU(EndOfTU),
2364 HasUndefinedConstructors(false) {}
2366 /// \brief Checks whether pointee of a delete-expression is initialized with
2367 /// matching form of new-expression.
2369 /// If return value is \c VarInitMismatches or \c MemberInitMismatches at the
2370 /// point where delete-expression is encountered, then a warning will be
2371 /// issued immediately. If return value is \c AnalyzeLater at the point where
2372 /// delete-expression is seen, then member will be analyzed at the end of
2373 /// translation unit. \c AnalyzeLater is returned iff at least one constructor
2374 /// couldn't be analyzed. If at least one constructor initializes the member
2375 /// with matching type of new, the return value is \c NoMismatch.
2376 MismatchResult analyzeDeleteExpr(const CXXDeleteExpr *DE);
2377 /// \brief Analyzes a class member.
2378 /// \param Field Class member to analyze.
2379 /// \param DeleteWasArrayForm Array form-ness of the delete-expression used
2380 /// for deleting the \p Field.
2381 MismatchResult analyzeField(FieldDecl *Field, bool DeleteWasArrayForm);
2382 /// List of mismatching new-expressions used for initialization of the pointee
2383 llvm::SmallVector<const CXXNewExpr *, 4> NewExprs;
2384 /// Indicates whether delete-expression was in array form.
2390 /// \brief Indicates that there is at least one constructor without body.
2391 bool HasUndefinedConstructors;
2392 /// \brief Returns \c CXXNewExpr from given initialization expression.
2393 /// \param E Expression used for initializing pointee in delete-expression.
2394 /// E can be a single-element \c InitListExpr consisting of new-expression.
2395 const CXXNewExpr *getNewExprFromInitListOrExpr(const Expr *E);
2396 /// \brief Returns whether member is initialized with mismatching form of
2397 /// \c new either by the member initializer or in-class initialization.
2399 /// If bodies of all constructors are not visible at the end of translation
2400 /// unit or at least one constructor initializes member with the matching
2401 /// form of \c new, mismatch cannot be proven, and this function will return
2403 MismatchResult analyzeMemberExpr(const MemberExpr *ME);
2404 /// \brief Returns whether variable is initialized with mismatching form of
2407 /// If variable is initialized with matching form of \c new or variable is not
2408 /// initialized with a \c new expression, this function will return true.
2409 /// If variable is initialized with mismatching form of \c new, returns false.
2410 /// \param D Variable to analyze.
2411 bool hasMatchingVarInit(const DeclRefExpr *D);
2412 /// \brief Checks whether the constructor initializes pointee with mismatching
2415 /// Returns true, if member is initialized with matching form of \c new in
2416 /// member initializer list. Returns false, if member is initialized with the
2417 /// matching form of \c new in this constructor's initializer or given
2418 /// constructor isn't defined at the point where delete-expression is seen, or
2419 /// member isn't initialized by the constructor.
2420 bool hasMatchingNewInCtor(const CXXConstructorDecl *CD);
2421 /// \brief Checks whether member is initialized with matching form of
2422 /// \c new in member initializer list.
2423 bool hasMatchingNewInCtorInit(const CXXCtorInitializer *CI);
2424 /// Checks whether member is initialized with mismatching form of \c new by
2425 /// in-class initializer.
2426 MismatchResult analyzeInClassInitializer();
2430 MismatchingNewDeleteDetector::MismatchResult
2431 MismatchingNewDeleteDetector::analyzeDeleteExpr(const CXXDeleteExpr *DE) {
2433 assert(DE && "Expected delete-expression");
2434 IsArrayForm = DE->isArrayForm();
2435 const Expr *E = DE->getArgument()->IgnoreParenImpCasts();
2436 if (const MemberExpr *ME = dyn_cast<const MemberExpr>(E)) {
2437 return analyzeMemberExpr(ME);
2438 } else if (const DeclRefExpr *D = dyn_cast<const DeclRefExpr>(E)) {
2439 if (!hasMatchingVarInit(D))
2440 return VarInitMismatches;
2446 MismatchingNewDeleteDetector::getNewExprFromInitListOrExpr(const Expr *E) {
2447 assert(E != nullptr && "Expected a valid initializer expression");
2448 E = E->IgnoreParenImpCasts();
2449 if (const InitListExpr *ILE = dyn_cast<const InitListExpr>(E)) {
2450 if (ILE->getNumInits() == 1)
2451 E = dyn_cast<const CXXNewExpr>(ILE->getInit(0)->IgnoreParenImpCasts());
2454 return dyn_cast_or_null<const CXXNewExpr>(E);
2457 bool MismatchingNewDeleteDetector::hasMatchingNewInCtorInit(
2458 const CXXCtorInitializer *CI) {
2459 const CXXNewExpr *NE = nullptr;
2460 if (Field == CI->getMember() &&
2461 (NE = getNewExprFromInitListOrExpr(CI->getInit()))) {
2462 if (NE->isArray() == IsArrayForm)
2465 NewExprs.push_back(NE);
2470 bool MismatchingNewDeleteDetector::hasMatchingNewInCtor(
2471 const CXXConstructorDecl *CD) {
2472 if (CD->isImplicit())
2474 const FunctionDecl *Definition = CD;
2475 if (!CD->isThisDeclarationADefinition() && !CD->isDefined(Definition)) {
2476 HasUndefinedConstructors = true;
2479 for (const auto *CI : cast<const CXXConstructorDecl>(Definition)->inits()) {
2480 if (hasMatchingNewInCtorInit(CI))
2486 MismatchingNewDeleteDetector::MismatchResult
2487 MismatchingNewDeleteDetector::analyzeInClassInitializer() {
2488 assert(Field != nullptr && "This should be called only for members");
2489 if (const CXXNewExpr *NE =
2490 getNewExprFromInitListOrExpr(Field->getInClassInitializer())) {
2491 if (NE->isArray() != IsArrayForm) {
2492 NewExprs.push_back(NE);
2493 return MemberInitMismatches;
2499 MismatchingNewDeleteDetector::MismatchResult
2500 MismatchingNewDeleteDetector::analyzeField(FieldDecl *Field,
2501 bool DeleteWasArrayForm) {
2502 assert(Field != nullptr && "Analysis requires a valid class member.");
2503 this->Field = Field;
2504 IsArrayForm = DeleteWasArrayForm;
2505 const CXXRecordDecl *RD = cast<const CXXRecordDecl>(Field->getParent());
2506 for (const auto *CD : RD->ctors()) {
2507 if (hasMatchingNewInCtor(CD))
2510 if (HasUndefinedConstructors)
2511 return EndOfTU ? NoMismatch : AnalyzeLater;
2512 if (!NewExprs.empty())
2513 return MemberInitMismatches;
2514 return Field->hasInClassInitializer() ? analyzeInClassInitializer()
2518 MismatchingNewDeleteDetector::MismatchResult
2519 MismatchingNewDeleteDetector::analyzeMemberExpr(const MemberExpr *ME) {
2520 assert(ME != nullptr && "Expected a member expression");
2521 if (FieldDecl *F = dyn_cast<FieldDecl>(ME->getMemberDecl()))
2522 return analyzeField(F, IsArrayForm);
2526 bool MismatchingNewDeleteDetector::hasMatchingVarInit(const DeclRefExpr *D) {
2527 const CXXNewExpr *NE = nullptr;
2528 if (const VarDecl *VD = dyn_cast<const VarDecl>(D->getDecl())) {
2529 if (VD->hasInit() && (NE = getNewExprFromInitListOrExpr(VD->getInit())) &&
2530 NE->isArray() != IsArrayForm) {
2531 NewExprs.push_back(NE);
2534 return NewExprs.empty();
2538 DiagnoseMismatchedNewDelete(Sema &SemaRef, SourceLocation DeleteLoc,
2539 const MismatchingNewDeleteDetector &Detector) {
2540 SourceLocation EndOfDelete = SemaRef.getLocForEndOfToken(DeleteLoc);
2542 if (!Detector.IsArrayForm)
2543 H = FixItHint::CreateInsertion(EndOfDelete, "[]");
2545 SourceLocation RSquare = Lexer::findLocationAfterToken(
2546 DeleteLoc, tok::l_square, SemaRef.getSourceManager(),
2547 SemaRef.getLangOpts(), true);
2548 if (RSquare.isValid())
2549 H = FixItHint::CreateRemoval(SourceRange(EndOfDelete, RSquare));
2551 SemaRef.Diag(DeleteLoc, diag::warn_mismatched_delete_new)
2552 << Detector.IsArrayForm << H;
2554 for (const auto *NE : Detector.NewExprs)
2555 SemaRef.Diag(NE->getExprLoc(), diag::note_allocated_here)
2556 << Detector.IsArrayForm;
2559 void Sema::AnalyzeDeleteExprMismatch(const CXXDeleteExpr *DE) {
2560 if (Diags.isIgnored(diag::warn_mismatched_delete_new, SourceLocation()))
2562 MismatchingNewDeleteDetector Detector(/*EndOfTU=*/false);
2563 switch (Detector.analyzeDeleteExpr(DE)) {
2564 case MismatchingNewDeleteDetector::VarInitMismatches:
2565 case MismatchingNewDeleteDetector::MemberInitMismatches: {
2566 DiagnoseMismatchedNewDelete(*this, DE->getLocStart(), Detector);
2569 case MismatchingNewDeleteDetector::AnalyzeLater: {
2570 DeleteExprs[Detector.Field].push_back(
2571 std::make_pair(DE->getLocStart(), DE->isArrayForm()));
2574 case MismatchingNewDeleteDetector::NoMismatch:
2579 void Sema::AnalyzeDeleteExprMismatch(FieldDecl *Field, SourceLocation DeleteLoc,
2580 bool DeleteWasArrayForm) {
2581 MismatchingNewDeleteDetector Detector(/*EndOfTU=*/true);
2582 switch (Detector.analyzeField(Field, DeleteWasArrayForm)) {
2583 case MismatchingNewDeleteDetector::VarInitMismatches:
2584 llvm_unreachable("This analysis should have been done for class members.");
2585 case MismatchingNewDeleteDetector::AnalyzeLater:
2586 llvm_unreachable("Analysis cannot be postponed any point beyond end of "
2587 "translation unit.");
2588 case MismatchingNewDeleteDetector::MemberInitMismatches:
2589 DiagnoseMismatchedNewDelete(*this, DeleteLoc, Detector);
2591 case MismatchingNewDeleteDetector::NoMismatch:
2596 /// ActOnCXXDelete - Parsed a C++ 'delete' expression (C++ 5.3.5), as in:
2597 /// @code ::delete ptr; @endcode
2599 /// @code delete [] ptr; @endcode
2601 Sema::ActOnCXXDelete(SourceLocation StartLoc, bool UseGlobal,
2602 bool ArrayForm, Expr *ExE) {
2603 // C++ [expr.delete]p1:
2604 // The operand shall have a pointer type, or a class type having a single
2605 // non-explicit conversion function to a pointer type. The result has type
2608 // DR599 amends "pointer type" to "pointer to object type" in both cases.
2610 ExprResult Ex = ExE;
2611 FunctionDecl *OperatorDelete = nullptr;
2612 bool ArrayFormAsWritten = ArrayForm;
2613 bool UsualArrayDeleteWantsSize = false;
2615 if (!Ex.get()->isTypeDependent()) {
2616 // Perform lvalue-to-rvalue cast, if needed.
2617 Ex = DefaultLvalueConversion(Ex.get());
2621 QualType Type = Ex.get()->getType();
2623 class DeleteConverter : public ContextualImplicitConverter {
2625 DeleteConverter() : ContextualImplicitConverter(false, true) {}
2627 bool match(QualType ConvType) override {
2628 // FIXME: If we have an operator T* and an operator void*, we must pick
2630 if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>())
2631 if (ConvPtrType->getPointeeType()->isIncompleteOrObjectType())
2636 SemaDiagnosticBuilder diagnoseNoMatch(Sema &S, SourceLocation Loc,
2637 QualType T) override {
2638 return S.Diag(Loc, diag::err_delete_operand) << T;
2641 SemaDiagnosticBuilder diagnoseIncomplete(Sema &S, SourceLocation Loc,
2642 QualType T) override {
2643 return S.Diag(Loc, diag::err_delete_incomplete_class_type) << T;
2646 SemaDiagnosticBuilder diagnoseExplicitConv(Sema &S, SourceLocation Loc,
2648 QualType ConvTy) override {
2649 return S.Diag(Loc, diag::err_delete_explicit_conversion) << T << ConvTy;
2652 SemaDiagnosticBuilder noteExplicitConv(Sema &S, CXXConversionDecl *Conv,
2653 QualType ConvTy) override {
2654 return S.Diag(Conv->getLocation(), diag::note_delete_conversion)
2658 SemaDiagnosticBuilder diagnoseAmbiguous(Sema &S, SourceLocation Loc,
2659 QualType T) override {
2660 return S.Diag(Loc, diag::err_ambiguous_delete_operand) << T;
2663 SemaDiagnosticBuilder noteAmbiguous(Sema &S, CXXConversionDecl *Conv,
2664 QualType ConvTy) override {
2665 return S.Diag(Conv->getLocation(), diag::note_delete_conversion)
2669 SemaDiagnosticBuilder diagnoseConversion(Sema &S, SourceLocation Loc,
2671 QualType ConvTy) override {
2672 llvm_unreachable("conversion functions are permitted");
2676 Ex = PerformContextualImplicitConversion(StartLoc, Ex.get(), Converter);
2679 Type = Ex.get()->getType();
2680 if (!Converter.match(Type))
2681 // FIXME: PerformContextualImplicitConversion should return ExprError
2682 // itself in this case.
2685 QualType Pointee = Type->getAs<PointerType>()->getPointeeType();
2686 QualType PointeeElem = Context.getBaseElementType(Pointee);
2688 if (unsigned AddressSpace = Pointee.getAddressSpace())
2689 return Diag(Ex.get()->getLocStart(),
2690 diag::err_address_space_qualified_delete)
2691 << Pointee.getUnqualifiedType() << AddressSpace;
2693 CXXRecordDecl *PointeeRD = nullptr;
2694 if (Pointee->isVoidType() && !isSFINAEContext()) {
2695 // The C++ standard bans deleting a pointer to a non-object type, which
2696 // effectively bans deletion of "void*". However, most compilers support
2697 // this, so we treat it as a warning unless we're in a SFINAE context.
2698 Diag(StartLoc, diag::ext_delete_void_ptr_operand)
2699 << Type << Ex.get()->getSourceRange();
2700 } else if (Pointee->isFunctionType() || Pointee->isVoidType()) {
2701 return ExprError(Diag(StartLoc, diag::err_delete_operand)
2702 << Type << Ex.get()->getSourceRange());
2703 } else if (!Pointee->isDependentType()) {
2704 if (!RequireCompleteType(StartLoc, Pointee,
2705 diag::warn_delete_incomplete, Ex.get())) {
2706 if (const RecordType *RT = PointeeElem->getAs<RecordType>())
2707 PointeeRD = cast<CXXRecordDecl>(RT->getDecl());
2711 if (Pointee->isArrayType() && !ArrayForm) {
2712 Diag(StartLoc, diag::warn_delete_array_type)
2713 << Type << Ex.get()->getSourceRange()
2714 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(StartLoc), "[]");
2718 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
2719 ArrayForm ? OO_Array_Delete : OO_Delete);
2723 FindDeallocationFunction(StartLoc, PointeeRD, DeleteName,
2727 // If we're allocating an array of records, check whether the
2728 // usual operator delete[] has a size_t parameter.
2730 // If the user specifically asked to use the global allocator,
2731 // we'll need to do the lookup into the class.
2733 UsualArrayDeleteWantsSize =
2734 doesUsualArrayDeleteWantSize(*this, StartLoc, PointeeElem);
2736 // Otherwise, the usual operator delete[] should be the
2737 // function we just found.
2738 else if (OperatorDelete && isa<CXXMethodDecl>(OperatorDelete))
2739 UsualArrayDeleteWantsSize = (OperatorDelete->getNumParams() == 2);
2742 if (!PointeeRD->hasIrrelevantDestructor())
2743 if (CXXDestructorDecl *Dtor = LookupDestructor(PointeeRD)) {
2744 MarkFunctionReferenced(StartLoc,
2745 const_cast<CXXDestructorDecl*>(Dtor));
2746 if (DiagnoseUseOfDecl(Dtor, StartLoc))
2750 // C++ [expr.delete]p3:
2751 // In the first alternative (delete object), if the static type of the
2752 // object to be deleted is different from its dynamic type, the static
2753 // type shall be a base class of the dynamic type of the object to be
2754 // deleted and the static type shall have a virtual destructor or the
2755 // behavior is undefined.
2757 // Note: a final class cannot be derived from, no issue there
2758 if (PointeeRD->isPolymorphic() && !PointeeRD->hasAttr<FinalAttr>()) {
2759 CXXDestructorDecl *dtor = PointeeRD->getDestructor();
2760 if (dtor && !dtor->isVirtual()) {
2761 if (PointeeRD->isAbstract()) {
2762 // If the class is abstract, we warn by default, because we're
2763 // sure the code has undefined behavior.
2764 Diag(StartLoc, diag::warn_delete_abstract_non_virtual_dtor)
2766 } else if (!ArrayForm) {
2767 // Otherwise, if this is not an array delete, it's a bit suspect,
2768 // but not necessarily wrong.
2769 Diag(StartLoc, diag::warn_delete_non_virtual_dtor) << PointeeElem;
2776 if (!OperatorDelete)
2777 // Look for a global declaration.
2778 OperatorDelete = FindUsualDeallocationFunction(
2779 StartLoc, !RequireCompleteType(StartLoc, Pointee, 0) &&
2780 (!ArrayForm || UsualArrayDeleteWantsSize ||
2781 Pointee.isDestructedType()),
2784 MarkFunctionReferenced(StartLoc, OperatorDelete);
2786 // Check access and ambiguity of operator delete and destructor.
2788 if (CXXDestructorDecl *Dtor = LookupDestructor(PointeeRD)) {
2789 CheckDestructorAccess(Ex.get()->getExprLoc(), Dtor,
2790 PDiag(diag::err_access_dtor) << PointeeElem);
2795 CXXDeleteExpr *Result = new (Context) CXXDeleteExpr(
2796 Context.VoidTy, UseGlobal, ArrayForm, ArrayFormAsWritten,
2797 UsualArrayDeleteWantsSize, OperatorDelete, Ex.get(), StartLoc);
2798 AnalyzeDeleteExprMismatch(Result);
2802 /// \brief Check the use of the given variable as a C++ condition in an if,
2803 /// while, do-while, or switch statement.
2804 ExprResult Sema::CheckConditionVariable(VarDecl *ConditionVar,
2805 SourceLocation StmtLoc,
2806 bool ConvertToBoolean) {
2807 if (ConditionVar->isInvalidDecl())
2810 QualType T = ConditionVar->getType();
2812 // C++ [stmt.select]p2:
2813 // The declarator shall not specify a function or an array.
2814 if (T->isFunctionType())
2815 return ExprError(Diag(ConditionVar->getLocation(),
2816 diag::err_invalid_use_of_function_type)
2817 << ConditionVar->getSourceRange());
2818 else if (T->isArrayType())
2819 return ExprError(Diag(ConditionVar->getLocation(),
2820 diag::err_invalid_use_of_array_type)
2821 << ConditionVar->getSourceRange());
2823 ExprResult Condition = DeclRefExpr::Create(
2824 Context, NestedNameSpecifierLoc(), SourceLocation(), ConditionVar,
2825 /*enclosing*/ false, ConditionVar->getLocation(),
2826 ConditionVar->getType().getNonReferenceType(), VK_LValue);
2828 MarkDeclRefReferenced(cast<DeclRefExpr>(Condition.get()));
2830 if (ConvertToBoolean) {
2831 Condition = CheckBooleanCondition(Condition.get(), StmtLoc);
2832 if (Condition.isInvalid())
2839 /// CheckCXXBooleanCondition - Returns true if a conversion to bool is invalid.
2840 ExprResult Sema::CheckCXXBooleanCondition(Expr *CondExpr) {
2842 // The value of a condition that is an initialized declaration in a statement
2843 // other than a switch statement is the value of the declared variable
2844 // implicitly converted to type bool. If that conversion is ill-formed, the
2845 // program is ill-formed.
2846 // The value of a condition that is an expression is the value of the
2847 // expression, implicitly converted to bool.
2849 return PerformContextuallyConvertToBool(CondExpr);
2852 /// Helper function to determine whether this is the (deprecated) C++
2853 /// conversion from a string literal to a pointer to non-const char or
2854 /// non-const wchar_t (for narrow and wide string literals,
2857 Sema::IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType) {
2858 // Look inside the implicit cast, if it exists.
2859 if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(From))
2860 From = Cast->getSubExpr();
2862 // A string literal (2.13.4) that is not a wide string literal can
2863 // be converted to an rvalue of type "pointer to char"; a wide
2864 // string literal can be converted to an rvalue of type "pointer
2865 // to wchar_t" (C++ 4.2p2).
2866 if (StringLiteral *StrLit = dyn_cast<StringLiteral>(From->IgnoreParens()))
2867 if (const PointerType *ToPtrType = ToType->getAs<PointerType>())
2868 if (const BuiltinType *ToPointeeType
2869 = ToPtrType->getPointeeType()->getAs<BuiltinType>()) {
2870 // This conversion is considered only when there is an
2871 // explicit appropriate pointer target type (C++ 4.2p2).
2872 if (!ToPtrType->getPointeeType().hasQualifiers()) {
2873 switch (StrLit->getKind()) {
2874 case StringLiteral::UTF8:
2875 case StringLiteral::UTF16:
2876 case StringLiteral::UTF32:
2877 // We don't allow UTF literals to be implicitly converted
2879 case StringLiteral::Ascii:
2880 return (ToPointeeType->getKind() == BuiltinType::Char_U ||
2881 ToPointeeType->getKind() == BuiltinType::Char_S);
2882 case StringLiteral::Wide:
2883 return ToPointeeType->isWideCharType();
2891 static ExprResult BuildCXXCastArgument(Sema &S,
2892 SourceLocation CastLoc,
2895 CXXMethodDecl *Method,
2896 DeclAccessPair FoundDecl,
2897 bool HadMultipleCandidates,
2900 default: llvm_unreachable("Unhandled cast kind!");
2901 case CK_ConstructorConversion: {
2902 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Method);
2903 SmallVector<Expr*, 8> ConstructorArgs;
2905 if (S.RequireNonAbstractType(CastLoc, Ty,
2906 diag::err_allocation_of_abstract_type))
2909 if (S.CompleteConstructorCall(Constructor, From, CastLoc, ConstructorArgs))
2912 S.CheckConstructorAccess(CastLoc, Constructor,
2913 InitializedEntity::InitializeTemporary(Ty),
2914 Constructor->getAccess());
2915 if (S.DiagnoseUseOfDecl(Method, CastLoc))
2918 ExprResult Result = S.BuildCXXConstructExpr(
2919 CastLoc, Ty, cast<CXXConstructorDecl>(Method),
2920 ConstructorArgs, HadMultipleCandidates,
2921 /*ListInit*/ false, /*StdInitListInit*/ false, /*ZeroInit*/ false,
2922 CXXConstructExpr::CK_Complete, SourceRange());
2923 if (Result.isInvalid())
2926 return S.MaybeBindToTemporary(Result.getAs<Expr>());
2929 case CK_UserDefinedConversion: {
2930 assert(!From->getType()->isPointerType() && "Arg can't have pointer type!");
2932 S.CheckMemberOperatorAccess(CastLoc, From, /*arg*/ nullptr, FoundDecl);
2933 if (S.DiagnoseUseOfDecl(Method, CastLoc))
2936 // Create an implicit call expr that calls it.
2937 CXXConversionDecl *Conv = cast<CXXConversionDecl>(Method);
2938 ExprResult Result = S.BuildCXXMemberCallExpr(From, FoundDecl, Conv,
2939 HadMultipleCandidates);
2940 if (Result.isInvalid())
2942 // Record usage of conversion in an implicit cast.
2943 Result = ImplicitCastExpr::Create(S.Context, Result.get()->getType(),
2944 CK_UserDefinedConversion, Result.get(),
2945 nullptr, Result.get()->getValueKind());
2947 return S.MaybeBindToTemporary(Result.get());
2952 /// PerformImplicitConversion - Perform an implicit conversion of the
2953 /// expression From to the type ToType using the pre-computed implicit
2954 /// conversion sequence ICS. Returns the converted
2955 /// expression. Action is the kind of conversion we're performing,
2956 /// used in the error message.
2958 Sema::PerformImplicitConversion(Expr *From, QualType ToType,
2959 const ImplicitConversionSequence &ICS,
2960 AssignmentAction Action,
2961 CheckedConversionKind CCK) {
2962 switch (ICS.getKind()) {
2963 case ImplicitConversionSequence::StandardConversion: {
2964 ExprResult Res = PerformImplicitConversion(From, ToType, ICS.Standard,
2966 if (Res.isInvalid())
2972 case ImplicitConversionSequence::UserDefinedConversion: {
2974 FunctionDecl *FD = ICS.UserDefined.ConversionFunction;
2976 QualType BeforeToType;
2977 assert(FD && "no conversion function for user-defined conversion seq");
2978 if (const CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(FD)) {
2979 CastKind = CK_UserDefinedConversion;
2981 // If the user-defined conversion is specified by a conversion function,
2982 // the initial standard conversion sequence converts the source type to
2983 // the implicit object parameter of the conversion function.
2984 BeforeToType = Context.getTagDeclType(Conv->getParent());
2986 const CXXConstructorDecl *Ctor = cast<CXXConstructorDecl>(FD);
2987 CastKind = CK_ConstructorConversion;
2988 // Do no conversion if dealing with ... for the first conversion.
2989 if (!ICS.UserDefined.EllipsisConversion) {
2990 // If the user-defined conversion is specified by a constructor, the
2991 // initial standard conversion sequence converts the source type to
2992 // the type required by the argument of the constructor
2993 BeforeToType = Ctor->getParamDecl(0)->getType().getNonReferenceType();
2996 // Watch out for ellipsis conversion.
2997 if (!ICS.UserDefined.EllipsisConversion) {
2999 PerformImplicitConversion(From, BeforeToType,
3000 ICS.UserDefined.Before, AA_Converting,
3002 if (Res.isInvalid())
3008 = BuildCXXCastArgument(*this,
3009 From->getLocStart(),
3010 ToType.getNonReferenceType(),
3011 CastKind, cast<CXXMethodDecl>(FD),
3012 ICS.UserDefined.FoundConversionFunction,
3013 ICS.UserDefined.HadMultipleCandidates,
3016 if (CastArg.isInvalid())
3019 From = CastArg.get();
3021 return PerformImplicitConversion(From, ToType, ICS.UserDefined.After,
3022 AA_Converting, CCK);
3025 case ImplicitConversionSequence::AmbiguousConversion:
3026 ICS.DiagnoseAmbiguousConversion(*this, From->getExprLoc(),
3027 PDiag(diag::err_typecheck_ambiguous_condition)
3028 << From->getSourceRange());
3031 case ImplicitConversionSequence::EllipsisConversion:
3032 llvm_unreachable("Cannot perform an ellipsis conversion");
3034 case ImplicitConversionSequence::BadConversion:
3038 // Everything went well.
3042 /// PerformImplicitConversion - Perform an implicit conversion of the
3043 /// expression From to the type ToType by following the standard
3044 /// conversion sequence SCS. Returns the converted
3045 /// expression. Flavor is the context in which we're performing this
3046 /// conversion, for use in error messages.
3048 Sema::PerformImplicitConversion(Expr *From, QualType ToType,
3049 const StandardConversionSequence& SCS,
3050 AssignmentAction Action,
3051 CheckedConversionKind CCK) {
3052 bool CStyle = (CCK == CCK_CStyleCast || CCK == CCK_FunctionalCast);
3054 // Overall FIXME: we are recomputing too many types here and doing far too
3055 // much extra work. What this means is that we need to keep track of more
3056 // information that is computed when we try the implicit conversion initially,
3057 // so that we don't need to recompute anything here.
3058 QualType FromType = From->getType();
3060 if (SCS.CopyConstructor) {
3061 // FIXME: When can ToType be a reference type?
3062 assert(!ToType->isReferenceType());
3063 if (SCS.Second == ICK_Derived_To_Base) {
3064 SmallVector<Expr*, 8> ConstructorArgs;
3065 if (CompleteConstructorCall(cast<CXXConstructorDecl>(SCS.CopyConstructor),
3066 From, /*FIXME:ConstructLoc*/SourceLocation(),
3069 return BuildCXXConstructExpr(
3070 /*FIXME:ConstructLoc*/ SourceLocation(), ToType, SCS.CopyConstructor,
3071 ConstructorArgs, /*HadMultipleCandidates*/ false,
3072 /*ListInit*/ false, /*StdInitListInit*/ false, /*ZeroInit*/ false,
3073 CXXConstructExpr::CK_Complete, SourceRange());
3075 return BuildCXXConstructExpr(
3076 /*FIXME:ConstructLoc*/ SourceLocation(), ToType, SCS.CopyConstructor,
3077 From, /*HadMultipleCandidates*/ false,
3078 /*ListInit*/ false, /*StdInitListInit*/ false, /*ZeroInit*/ false,
3079 CXXConstructExpr::CK_Complete, SourceRange());
3082 // Resolve overloaded function references.
3083 if (Context.hasSameType(FromType, Context.OverloadTy)) {
3084 DeclAccessPair Found;
3085 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(From, ToType,
3090 if (DiagnoseUseOfDecl(Fn, From->getLocStart()))
3093 From = FixOverloadedFunctionReference(From, Found, Fn);
3094 FromType = From->getType();
3097 // If we're converting to an atomic type, first convert to the corresponding
3099 QualType ToAtomicType;
3100 if (const AtomicType *ToAtomic = ToType->getAs<AtomicType>()) {
3101 ToAtomicType = ToType;
3102 ToType = ToAtomic->getValueType();
3105 // Perform the first implicit conversion.
3106 switch (SCS.First) {
3108 if (const AtomicType *FromAtomic = FromType->getAs<AtomicType>()) {
3109 FromType = FromAtomic->getValueType().getUnqualifiedType();
3110 From = ImplicitCastExpr::Create(Context, FromType, CK_AtomicToNonAtomic,
3111 From, /*BasePath=*/nullptr, VK_RValue);
3115 case ICK_Lvalue_To_Rvalue: {
3116 assert(From->getObjectKind() != OK_ObjCProperty);
3117 ExprResult FromRes = DefaultLvalueConversion(From);
3118 assert(!FromRes.isInvalid() && "Can't perform deduced conversion?!");
3119 From = FromRes.get();
3120 FromType = From->getType();
3124 case ICK_Array_To_Pointer:
3125 FromType = Context.getArrayDecayedType(FromType);
3126 From = ImpCastExprToType(From, FromType, CK_ArrayToPointerDecay,
3127 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3130 case ICK_Function_To_Pointer:
3131 FromType = Context.getPointerType(FromType);
3132 From = ImpCastExprToType(From, FromType, CK_FunctionToPointerDecay,
3133 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3137 llvm_unreachable("Improper first standard conversion");
3140 // Perform the second implicit conversion
3141 switch (SCS.Second) {
3143 // C++ [except.spec]p5:
3144 // [For] assignment to and initialization of pointers to functions,
3145 // pointers to member functions, and references to functions: the
3146 // target entity shall allow at least the exceptions allowed by the
3147 // source value in the assignment or initialization.
3150 case AA_Initializing:
3151 // Note, function argument passing and returning are initialization.
3155 case AA_Passing_CFAudited:
3156 if (CheckExceptionSpecCompatibility(From, ToType))
3162 // Casts and implicit conversions are not initialization, so are not
3163 // checked for exception specification mismatches.
3166 // Nothing else to do.
3169 case ICK_NoReturn_Adjustment:
3170 // If both sides are functions (or pointers/references to them), there could
3171 // be incompatible exception declarations.
3172 if (CheckExceptionSpecCompatibility(From, ToType))
3175 From = ImpCastExprToType(From, ToType, CK_NoOp,
3176 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3179 case ICK_Integral_Promotion:
3180 case ICK_Integral_Conversion:
3181 if (ToType->isBooleanType()) {
3182 assert(FromType->castAs<EnumType>()->getDecl()->isFixed() &&
3183 SCS.Second == ICK_Integral_Promotion &&
3184 "only enums with fixed underlying type can promote to bool");
3185 From = ImpCastExprToType(From, ToType, CK_IntegralToBoolean,
3186 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3188 From = ImpCastExprToType(From, ToType, CK_IntegralCast,
3189 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3193 case ICK_Floating_Promotion:
3194 case ICK_Floating_Conversion:
3195 From = ImpCastExprToType(From, ToType, CK_FloatingCast,
3196 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3199 case ICK_Complex_Promotion:
3200 case ICK_Complex_Conversion: {
3201 QualType FromEl = From->getType()->getAs<ComplexType>()->getElementType();
3202 QualType ToEl = ToType->getAs<ComplexType>()->getElementType();
3204 if (FromEl->isRealFloatingType()) {
3205 if (ToEl->isRealFloatingType())
3206 CK = CK_FloatingComplexCast;
3208 CK = CK_FloatingComplexToIntegralComplex;
3209 } else if (ToEl->isRealFloatingType()) {
3210 CK = CK_IntegralComplexToFloatingComplex;
3212 CK = CK_IntegralComplexCast;
3214 From = ImpCastExprToType(From, ToType, CK,
3215 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3219 case ICK_Floating_Integral:
3220 if (ToType->isRealFloatingType())
3221 From = ImpCastExprToType(From, ToType, CK_IntegralToFloating,
3222 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3224 From = ImpCastExprToType(From, ToType, CK_FloatingToIntegral,
3225 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3228 case ICK_Compatible_Conversion:
3229 From = ImpCastExprToType(From, ToType, CK_NoOp,
3230 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3233 case ICK_Writeback_Conversion:
3234 case ICK_Pointer_Conversion: {
3235 if (SCS.IncompatibleObjC && Action != AA_Casting) {
3236 // Diagnose incompatible Objective-C conversions
3237 if (Action == AA_Initializing || Action == AA_Assigning)
3238 Diag(From->getLocStart(),
3239 diag::ext_typecheck_convert_incompatible_pointer)
3240 << ToType << From->getType() << Action
3241 << From->getSourceRange() << 0;
3243 Diag(From->getLocStart(),
3244 diag::ext_typecheck_convert_incompatible_pointer)
3245 << From->getType() << ToType << Action
3246 << From->getSourceRange() << 0;
3248 if (From->getType()->isObjCObjectPointerType() &&
3249 ToType->isObjCObjectPointerType())
3250 EmitRelatedResultTypeNote(From);
3252 else if (getLangOpts().ObjCAutoRefCount &&
3253 !CheckObjCARCUnavailableWeakConversion(ToType,
3255 if (Action == AA_Initializing)
3256 Diag(From->getLocStart(),
3257 diag::err_arc_weak_unavailable_assign);
3259 Diag(From->getLocStart(),
3260 diag::err_arc_convesion_of_weak_unavailable)
3261 << (Action == AA_Casting) << From->getType() << ToType
3262 << From->getSourceRange();
3265 CastKind Kind = CK_Invalid;
3266 CXXCastPath BasePath;
3267 if (CheckPointerConversion(From, ToType, Kind, BasePath, CStyle))
3270 // Make sure we extend blocks if necessary.
3271 // FIXME: doing this here is really ugly.
3272 if (Kind == CK_BlockPointerToObjCPointerCast) {
3273 ExprResult E = From;
3274 (void) PrepareCastToObjCObjectPointer(E);
3277 if (getLangOpts().ObjCAutoRefCount)
3278 CheckObjCARCConversion(SourceRange(), ToType, From, CCK);
3279 From = ImpCastExprToType(From, ToType, Kind, VK_RValue, &BasePath, CCK)
3284 case ICK_Pointer_Member: {
3285 CastKind Kind = CK_Invalid;
3286 CXXCastPath BasePath;
3287 if (CheckMemberPointerConversion(From, ToType, Kind, BasePath, CStyle))
3289 if (CheckExceptionSpecCompatibility(From, ToType))
3292 // We may not have been able to figure out what this member pointer resolved
3293 // to up until this exact point. Attempt to lock-in it's inheritance model.
3294 QualType FromType = From->getType();
3295 if (FromType->isMemberPointerType())
3296 if (Context.getTargetInfo().getCXXABI().isMicrosoft())
3297 RequireCompleteType(From->getExprLoc(), FromType, 0);
3299 From = ImpCastExprToType(From, ToType, Kind, VK_RValue, &BasePath, CCK)
3304 case ICK_Boolean_Conversion:
3305 // Perform half-to-boolean conversion via float.
3306 if (From->getType()->isHalfType()) {
3307 From = ImpCastExprToType(From, Context.FloatTy, CK_FloatingCast).get();
3308 FromType = Context.FloatTy;
3311 From = ImpCastExprToType(From, Context.BoolTy,
3312 ScalarTypeToBooleanCastKind(FromType),
3313 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3316 case ICK_Derived_To_Base: {
3317 CXXCastPath BasePath;
3318 if (CheckDerivedToBaseConversion(From->getType(),
3319 ToType.getNonReferenceType(),
3320 From->getLocStart(),
3321 From->getSourceRange(),
3326 From = ImpCastExprToType(From, ToType.getNonReferenceType(),
3327 CK_DerivedToBase, From->getValueKind(),
3328 &BasePath, CCK).get();
3332 case ICK_Vector_Conversion:
3333 From = ImpCastExprToType(From, ToType, CK_BitCast,
3334 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3337 case ICK_Vector_Splat:
3338 // Vector splat from any arithmetic type to a vector.
3339 // Cast to the element type.
3341 QualType elType = ToType->getAs<ExtVectorType>()->getElementType();
3342 if (elType != From->getType()) {
3343 ExprResult E = From;
3344 From = ImpCastExprToType(From, elType,
3345 PrepareScalarCast(E, elType)).get();
3347 From = ImpCastExprToType(From, ToType, CK_VectorSplat,
3348 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3352 case ICK_Complex_Real:
3353 // Case 1. x -> _Complex y
3354 if (const ComplexType *ToComplex = ToType->getAs<ComplexType>()) {
3355 QualType ElType = ToComplex->getElementType();
3356 bool isFloatingComplex = ElType->isRealFloatingType();
3359 if (Context.hasSameUnqualifiedType(ElType, From->getType())) {
3361 } else if (From->getType()->isRealFloatingType()) {
3362 From = ImpCastExprToType(From, ElType,
3363 isFloatingComplex ? CK_FloatingCast : CK_FloatingToIntegral).get();
3365 assert(From->getType()->isIntegerType());
3366 From = ImpCastExprToType(From, ElType,
3367 isFloatingComplex ? CK_IntegralToFloating : CK_IntegralCast).get();
3370 From = ImpCastExprToType(From, ToType,
3371 isFloatingComplex ? CK_FloatingRealToComplex
3372 : CK_IntegralRealToComplex).get();
3374 // Case 2. _Complex x -> y
3376 const ComplexType *FromComplex = From->getType()->getAs<ComplexType>();
3377 assert(FromComplex);
3379 QualType ElType = FromComplex->getElementType();
3380 bool isFloatingComplex = ElType->isRealFloatingType();
3383 From = ImpCastExprToType(From, ElType,
3384 isFloatingComplex ? CK_FloatingComplexToReal
3385 : CK_IntegralComplexToReal,
3386 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3389 if (Context.hasSameUnqualifiedType(ElType, ToType)) {
3391 } else if (ToType->isRealFloatingType()) {
3392 From = ImpCastExprToType(From, ToType,
3393 isFloatingComplex ? CK_FloatingCast : CK_IntegralToFloating,
3394 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3396 assert(ToType->isIntegerType());
3397 From = ImpCastExprToType(From, ToType,
3398 isFloatingComplex ? CK_FloatingToIntegral : CK_IntegralCast,
3399 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3404 case ICK_Block_Pointer_Conversion: {
3405 From = ImpCastExprToType(From, ToType.getUnqualifiedType(), CK_BitCast,
3406 VK_RValue, /*BasePath=*/nullptr, CCK).get();
3410 case ICK_TransparentUnionConversion: {
3411 ExprResult FromRes = From;
3412 Sema::AssignConvertType ConvTy =
3413 CheckTransparentUnionArgumentConstraints(ToType, FromRes);
3414 if (FromRes.isInvalid())
3416 From = FromRes.get();
3417 assert ((ConvTy == Sema::Compatible) &&
3418 "Improper transparent union conversion");
3423 case ICK_Zero_Event_Conversion:
3424 From = ImpCastExprToType(From, ToType,
3426 From->getValueKind()).get();
3429 case ICK_Lvalue_To_Rvalue:
3430 case ICK_Array_To_Pointer:
3431 case ICK_Function_To_Pointer:
3432 case ICK_Qualification:
3433 case ICK_Num_Conversion_Kinds:
3434 llvm_unreachable("Improper second standard conversion");
3437 switch (SCS.Third) {
3442 case ICK_Qualification: {
3443 // The qualification keeps the category of the inner expression, unless the
3444 // target type isn't a reference.
3445 ExprValueKind VK = ToType->isReferenceType() ?
3446 From->getValueKind() : VK_RValue;
3447 From = ImpCastExprToType(From, ToType.getNonLValueExprType(Context),
3448 CK_NoOp, VK, /*BasePath=*/nullptr, CCK).get();
3450 if (SCS.DeprecatedStringLiteralToCharPtr &&
3451 !getLangOpts().WritableStrings) {
3452 Diag(From->getLocStart(), getLangOpts().CPlusPlus11
3453 ? diag::ext_deprecated_string_literal_conversion
3454 : diag::warn_deprecated_string_literal_conversion)
3455 << ToType.getNonReferenceType();
3462 llvm_unreachable("Improper third standard conversion");
3465 // If this conversion sequence involved a scalar -> atomic conversion, perform
3466 // that conversion now.
3467 if (!ToAtomicType.isNull()) {
3468 assert(Context.hasSameType(
3469 ToAtomicType->castAs<AtomicType>()->getValueType(), From->getType()));
3470 From = ImpCastExprToType(From, ToAtomicType, CK_NonAtomicToAtomic,
3471 VK_RValue, nullptr, CCK).get();
3477 /// \brief Check the completeness of a type in a unary type trait.
3479 /// If the particular type trait requires a complete type, tries to complete
3480 /// it. If completing the type fails, a diagnostic is emitted and false
3481 /// returned. If completing the type succeeds or no completion was required,
3483 static bool CheckUnaryTypeTraitTypeCompleteness(Sema &S, TypeTrait UTT,
3486 // C++0x [meta.unary.prop]p3:
3487 // For all of the class templates X declared in this Clause, instantiating
3488 // that template with a template argument that is a class template
3489 // specialization may result in the implicit instantiation of the template
3490 // argument if and only if the semantics of X require that the argument
3491 // must be a complete type.
3492 // We apply this rule to all the type trait expressions used to implement
3493 // these class templates. We also try to follow any GCC documented behavior
3494 // in these expressions to ensure portability of standard libraries.
3496 default: llvm_unreachable("not a UTT");
3497 // is_complete_type somewhat obviously cannot require a complete type.
3498 case UTT_IsCompleteType:
3501 // These traits are modeled on the type predicates in C++0x
3502 // [meta.unary.cat] and [meta.unary.comp]. They are not specified as
3503 // requiring a complete type, as whether or not they return true cannot be
3504 // impacted by the completeness of the type.
3506 case UTT_IsIntegral:
3507 case UTT_IsFloatingPoint:
3510 case UTT_IsLvalueReference:
3511 case UTT_IsRvalueReference:
3512 case UTT_IsMemberFunctionPointer:
3513 case UTT_IsMemberObjectPointer:
3517 case UTT_IsFunction:
3518 case UTT_IsReference:
3519 case UTT_IsArithmetic:
3520 case UTT_IsFundamental:
3523 case UTT_IsCompound:
3524 case UTT_IsMemberPointer:
3527 // These traits are modeled on type predicates in C++0x [meta.unary.prop]
3528 // which requires some of its traits to have the complete type. However,
3529 // the completeness of the type cannot impact these traits' semantics, and
3530 // so they don't require it. This matches the comments on these traits in
3533 case UTT_IsVolatile:
3535 case UTT_IsUnsigned:
3538 // C++0x [meta.unary.prop] Table 49 requires the following traits to be
3539 // applied to a complete type.
3541 case UTT_IsTriviallyCopyable:
3542 case UTT_IsStandardLayout:
3546 case UTT_IsPolymorphic:
3547 case UTT_IsAbstract:
3548 case UTT_IsInterfaceClass:
3549 case UTT_IsDestructible:
3550 case UTT_IsNothrowDestructible:
3553 // These traits require a complete type.
3557 // These trait expressions are designed to help implement predicates in
3558 // [meta.unary.prop] despite not being named the same. They are specified
3559 // by both GCC and the Embarcadero C++ compiler, and require the complete
3560 // type due to the overarching C++0x type predicates being implemented
3561 // requiring the complete type.
3562 case UTT_HasNothrowAssign:
3563 case UTT_HasNothrowMoveAssign:
3564 case UTT_HasNothrowConstructor:
3565 case UTT_HasNothrowCopy:
3566 case UTT_HasTrivialAssign:
3567 case UTT_HasTrivialMoveAssign:
3568 case UTT_HasTrivialDefaultConstructor:
3569 case UTT_HasTrivialMoveConstructor:
3570 case UTT_HasTrivialCopy:
3571 case UTT_HasTrivialDestructor:
3572 case UTT_HasVirtualDestructor:
3573 // Arrays of unknown bound are expressly allowed.
3574 QualType ElTy = ArgTy;
3575 if (ArgTy->isIncompleteArrayType())
3576 ElTy = S.Context.getAsArrayType(ArgTy)->getElementType();
3578 // The void type is expressly allowed.
3579 if (ElTy->isVoidType())
3582 return !S.RequireCompleteType(
3583 Loc, ElTy, diag::err_incomplete_type_used_in_type_trait_expr);
3587 static bool HasNoThrowOperator(const RecordType *RT, OverloadedOperatorKind Op,
3588 Sema &Self, SourceLocation KeyLoc, ASTContext &C,
3589 bool (CXXRecordDecl::*HasTrivial)() const,
3590 bool (CXXRecordDecl::*HasNonTrivial)() const,
3591 bool (CXXMethodDecl::*IsDesiredOp)() const)
3593 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
3594 if ((RD->*HasTrivial)() && !(RD->*HasNonTrivial)())
3597 DeclarationName Name = C.DeclarationNames.getCXXOperatorName(Op);
3598 DeclarationNameInfo NameInfo(Name, KeyLoc);
3599 LookupResult Res(Self, NameInfo, Sema::LookupOrdinaryName);
3600 if (Self.LookupQualifiedName(Res, RD)) {
3601 bool FoundOperator = false;
3602 Res.suppressDiagnostics();
3603 for (LookupResult::iterator Op = Res.begin(), OpEnd = Res.end();
3604 Op != OpEnd; ++Op) {
3605 if (isa<FunctionTemplateDecl>(*Op))
3608 CXXMethodDecl *Operator = cast<CXXMethodDecl>(*Op);
3609 if((Operator->*IsDesiredOp)()) {
3610 FoundOperator = true;
3611 const FunctionProtoType *CPT =
3612 Operator->getType()->getAs<FunctionProtoType>();
3613 CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
3614 if (!CPT || !CPT->isNothrow(C))
3618 return FoundOperator;
3623 static bool EvaluateUnaryTypeTrait(Sema &Self, TypeTrait UTT,
3624 SourceLocation KeyLoc, QualType T) {
3625 assert(!T->isDependentType() && "Cannot evaluate traits of dependent type");
3627 ASTContext &C = Self.Context;
3629 default: llvm_unreachable("not a UTT");
3630 // Type trait expressions corresponding to the primary type category
3631 // predicates in C++0x [meta.unary.cat].
3633 return T->isVoidType();
3634 case UTT_IsIntegral:
3635 return T->isIntegralType(C);
3636 case UTT_IsFloatingPoint:
3637 return T->isFloatingType();
3639 return T->isArrayType();
3641 return T->isPointerType();
3642 case UTT_IsLvalueReference:
3643 return T->isLValueReferenceType();
3644 case UTT_IsRvalueReference:
3645 return T->isRValueReferenceType();
3646 case UTT_IsMemberFunctionPointer:
3647 return T->isMemberFunctionPointerType();
3648 case UTT_IsMemberObjectPointer:
3649 return T->isMemberDataPointerType();
3651 return T->isEnumeralType();
3653 return T->isUnionType();
3655 return T->isClassType() || T->isStructureType() || T->isInterfaceType();
3656 case UTT_IsFunction:
3657 return T->isFunctionType();
3659 // Type trait expressions which correspond to the convenient composition
3660 // predicates in C++0x [meta.unary.comp].
3661 case UTT_IsReference:
3662 return T->isReferenceType();
3663 case UTT_IsArithmetic:
3664 return T->isArithmeticType() && !T->isEnumeralType();
3665 case UTT_IsFundamental:
3666 return T->isFundamentalType();
3668 return T->isObjectType();
3670 // Note: semantic analysis depends on Objective-C lifetime types to be
3671 // considered scalar types. However, such types do not actually behave
3672 // like scalar types at run time (since they may require retain/release
3673 // operations), so we report them as non-scalar.
3674 if (T->isObjCLifetimeType()) {
3675 switch (T.getObjCLifetime()) {
3676 case Qualifiers::OCL_None:
3677 case Qualifiers::OCL_ExplicitNone:
3680 case Qualifiers::OCL_Strong:
3681 case Qualifiers::OCL_Weak:
3682 case Qualifiers::OCL_Autoreleasing:
3687 return T->isScalarType();
3688 case UTT_IsCompound:
3689 return T->isCompoundType();
3690 case UTT_IsMemberPointer:
3691 return T->isMemberPointerType();
3693 // Type trait expressions which correspond to the type property predicates
3694 // in C++0x [meta.unary.prop].
3696 return T.isConstQualified();
3697 case UTT_IsVolatile:
3698 return T.isVolatileQualified();
3700 return T.isTrivialType(Self.Context);
3701 case UTT_IsTriviallyCopyable:
3702 return T.isTriviallyCopyableType(Self.Context);
3703 case UTT_IsStandardLayout:
3704 return T->isStandardLayoutType();
3706 return T.isPODType(Self.Context);
3708 return T->isLiteralType(Self.Context);
3710 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3711 return !RD->isUnion() && RD->isEmpty();
3713 case UTT_IsPolymorphic:
3714 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3715 return RD->isPolymorphic();
3717 case UTT_IsAbstract:
3718 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3719 return RD->isAbstract();
3721 case UTT_IsInterfaceClass:
3722 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3723 return RD->isInterface();
3726 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3727 return RD->hasAttr<FinalAttr>();
3730 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3731 if (FinalAttr *FA = RD->getAttr<FinalAttr>())
3732 return FA->isSpelledAsSealed();
3735 return T->isSignedIntegerType();
3736 case UTT_IsUnsigned:
3737 return T->isUnsignedIntegerType();
3739 // Type trait expressions which query classes regarding their construction,
3740 // destruction, and copying. Rather than being based directly on the
3741 // related type predicates in the standard, they are specified by both
3742 // GCC[1] and the Embarcadero C++ compiler[2], and Clang implements those
3745 // 1: http://gcc.gnu/.org/onlinedocs/gcc/Type-Traits.html
3746 // 2: http://docwiki.embarcadero.com/RADStudio/XE/en/Type_Trait_Functions_(C%2B%2B0x)_Index
3748 // Note that these builtins do not behave as documented in g++: if a class
3749 // has both a trivial and a non-trivial special member of a particular kind,
3750 // they return false! For now, we emulate this behavior.
3751 // FIXME: This appears to be a g++ bug: more complex cases reveal that it
3752 // does not correctly compute triviality in the presence of multiple special
3753 // members of the same kind. Revisit this once the g++ bug is fixed.
3754 case UTT_HasTrivialDefaultConstructor:
3755 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
3756 // If __is_pod (type) is true then the trait is true, else if type is
3757 // a cv class or union type (or array thereof) with a trivial default
3758 // constructor ([class.ctor]) then the trait is true, else it is false.
3759 if (T.isPODType(Self.Context))
3761 if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
3762 return RD->hasTrivialDefaultConstructor() &&
3763 !RD->hasNonTrivialDefaultConstructor();
3765 case UTT_HasTrivialMoveConstructor:
3766 // This trait is implemented by MSVC 2012 and needed to parse the
3767 // standard library headers. Specifically this is used as the logic
3768 // behind std::is_trivially_move_constructible (20.9.4.3).
3769 if (T.isPODType(Self.Context))
3771 if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
3772 return RD->hasTrivialMoveConstructor() && !RD->hasNonTrivialMoveConstructor();
3774 case UTT_HasTrivialCopy:
3775 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
3776 // If __is_pod (type) is true or type is a reference type then
3777 // the trait is true, else if type is a cv class or union type
3778 // with a trivial copy constructor ([class.copy]) then the trait
3779 // is true, else it is false.
3780 if (T.isPODType(Self.Context) || T->isReferenceType())
3782 if (CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3783 return RD->hasTrivialCopyConstructor() &&
3784 !RD->hasNonTrivialCopyConstructor();
3786 case UTT_HasTrivialMoveAssign:
3787 // This trait is implemented by MSVC 2012 and needed to parse the
3788 // standard library headers. Specifically it is used as the logic
3789 // behind std::is_trivially_move_assignable (20.9.4.3)
3790 if (T.isPODType(Self.Context))
3792 if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
3793 return RD->hasTrivialMoveAssignment() && !RD->hasNonTrivialMoveAssignment();
3795 case UTT_HasTrivialAssign:
3796 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
3797 // If type is const qualified or is a reference type then the
3798 // trait is false. Otherwise if __is_pod (type) is true then the
3799 // trait is true, else if type is a cv class or union type with
3800 // a trivial copy assignment ([class.copy]) then the trait is
3801 // true, else it is false.
3802 // Note: the const and reference restrictions are interesting,
3803 // given that const and reference members don't prevent a class
3804 // from having a trivial copy assignment operator (but do cause
3805 // errors if the copy assignment operator is actually used, q.v.
3806 // [class.copy]p12).
3808 if (T.isConstQualified())
3810 if (T.isPODType(Self.Context))
3812 if (CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3813 return RD->hasTrivialCopyAssignment() &&
3814 !RD->hasNonTrivialCopyAssignment();
3816 case UTT_IsDestructible:
3817 case UTT_IsNothrowDestructible:
3818 // FIXME: Implement UTT_IsDestructible and UTT_IsNothrowDestructible.
3819 // For now, let's fall through.
3820 case UTT_HasTrivialDestructor:
3821 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html
3822 // If __is_pod (type) is true or type is a reference type
3823 // then the trait is true, else if type is a cv class or union
3824 // type (or array thereof) with a trivial destructor
3825 // ([class.dtor]) then the trait is true, else it is
3827 if (T.isPODType(Self.Context) || T->isReferenceType())
3830 // Objective-C++ ARC: autorelease types don't require destruction.
3831 if (T->isObjCLifetimeType() &&
3832 T.getObjCLifetime() == Qualifiers::OCL_Autoreleasing)
3835 if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
3836 return RD->hasTrivialDestructor();
3838 // TODO: Propagate nothrowness for implicitly declared special members.
3839 case UTT_HasNothrowAssign:
3840 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
3841 // If type is const qualified or is a reference type then the
3842 // trait is false. Otherwise if __has_trivial_assign (type)
3843 // is true then the trait is true, else if type is a cv class
3844 // or union type with copy assignment operators that are known
3845 // not to throw an exception then the trait is true, else it is
3847 if (C.getBaseElementType(T).isConstQualified())
3849 if (T->isReferenceType())
3851 if (T.isPODType(Self.Context) || T->isObjCLifetimeType())
3854 if (const RecordType *RT = T->getAs<RecordType>())
3855 return HasNoThrowOperator(RT, OO_Equal, Self, KeyLoc, C,
3856 &CXXRecordDecl::hasTrivialCopyAssignment,
3857 &CXXRecordDecl::hasNonTrivialCopyAssignment,
3858 &CXXMethodDecl::isCopyAssignmentOperator);
3860 case UTT_HasNothrowMoveAssign:
3861 // This trait is implemented by MSVC 2012 and needed to parse the
3862 // standard library headers. Specifically this is used as the logic
3863 // behind std::is_nothrow_move_assignable (20.9.4.3).
3864 if (T.isPODType(Self.Context))
3867 if (const RecordType *RT = C.getBaseElementType(T)->getAs<RecordType>())
3868 return HasNoThrowOperator(RT, OO_Equal, Self, KeyLoc, C,
3869 &CXXRecordDecl::hasTrivialMoveAssignment,
3870 &CXXRecordDecl::hasNonTrivialMoveAssignment,
3871 &CXXMethodDecl::isMoveAssignmentOperator);
3873 case UTT_HasNothrowCopy:
3874 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
3875 // If __has_trivial_copy (type) is true then the trait is true, else
3876 // if type is a cv class or union type with copy constructors that are
3877 // known not to throw an exception then the trait is true, else it is
3879 if (T.isPODType(C) || T->isReferenceType() || T->isObjCLifetimeType())
3881 if (CXXRecordDecl *RD = T->getAsCXXRecordDecl()) {
3882 if (RD->hasTrivialCopyConstructor() &&
3883 !RD->hasNonTrivialCopyConstructor())
3886 bool FoundConstructor = false;
3888 DeclContext::lookup_result R = Self.LookupConstructors(RD);
3889 for (DeclContext::lookup_iterator Con = R.begin(),
3890 ConEnd = R.end(); Con != ConEnd; ++Con) {
3891 // A template constructor is never a copy constructor.
3892 // FIXME: However, it may actually be selected at the actual overload
3893 // resolution point.
3894 if (isa<FunctionTemplateDecl>(*Con))
3896 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con);
3897 if (Constructor->isCopyConstructor(FoundTQs)) {
3898 FoundConstructor = true;
3899 const FunctionProtoType *CPT
3900 = Constructor->getType()->getAs<FunctionProtoType>();
3901 CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
3904 // TODO: check whether evaluating default arguments can throw.
3905 // For now, we'll be conservative and assume that they can throw.
3906 if (!CPT->isNothrow(Self.Context) || CPT->getNumParams() > 1)
3911 return FoundConstructor;
3914 case UTT_HasNothrowConstructor:
3915 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html
3916 // If __has_trivial_constructor (type) is true then the trait is
3917 // true, else if type is a cv class or union type (or array
3918 // thereof) with a default constructor that is known not to
3919 // throw an exception then the trait is true, else it is false.
3920 if (T.isPODType(C) || T->isObjCLifetimeType())
3922 if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl()) {
3923 if (RD->hasTrivialDefaultConstructor() &&
3924 !RD->hasNonTrivialDefaultConstructor())
3927 bool FoundConstructor = false;
3928 DeclContext::lookup_result R = Self.LookupConstructors(RD);
3929 for (DeclContext::lookup_iterator Con = R.begin(),
3930 ConEnd = R.end(); Con != ConEnd; ++Con) {
3931 // FIXME: In C++0x, a constructor template can be a default constructor.
3932 if (isa<FunctionTemplateDecl>(*Con))
3934 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con);
3935 if (Constructor->isDefaultConstructor()) {
3936 FoundConstructor = true;
3937 const FunctionProtoType *CPT
3938 = Constructor->getType()->getAs<FunctionProtoType>();
3939 CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
3942 // FIXME: check whether evaluating default arguments can throw.
3943 // For now, we'll be conservative and assume that they can throw.
3944 if (!CPT->isNothrow(Self.Context) || CPT->getNumParams() > 0)
3948 return FoundConstructor;
3951 case UTT_HasVirtualDestructor:
3952 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
3953 // If type is a class type with a virtual destructor ([class.dtor])
3954 // then the trait is true, else it is false.
3955 if (CXXRecordDecl *RD = T->getAsCXXRecordDecl())
3956 if (CXXDestructorDecl *Destructor = Self.LookupDestructor(RD))
3957 return Destructor->isVirtual();
3960 // These type trait expressions are modeled on the specifications for the
3961 // Embarcadero C++0x type trait functions:
3962 // http://docwiki.embarcadero.com/RADStudio/XE/en/Type_Trait_Functions_(C%2B%2B0x)_Index
3963 case UTT_IsCompleteType:
3964 // http://docwiki.embarcadero.com/RADStudio/XE/en/Is_complete_type_(typename_T_):
3965 // Returns True if and only if T is a complete type at the point of the
3967 return !T->isIncompleteType();
3971 /// \brief Determine whether T has a non-trivial Objective-C lifetime in
3973 static bool hasNontrivialObjCLifetime(QualType T) {
3974 switch (T.getObjCLifetime()) {
3975 case Qualifiers::OCL_ExplicitNone:
3978 case Qualifiers::OCL_Strong:
3979 case Qualifiers::OCL_Weak:
3980 case Qualifiers::OCL_Autoreleasing:
3983 case Qualifiers::OCL_None:
3984 return T->isObjCLifetimeType();
3987 llvm_unreachable("Unknown ObjC lifetime qualifier");
3990 static bool EvaluateBinaryTypeTrait(Sema &Self, TypeTrait BTT, QualType LhsT,
3991 QualType RhsT, SourceLocation KeyLoc);
3993 static bool evaluateTypeTrait(Sema &S, TypeTrait Kind, SourceLocation KWLoc,
3994 ArrayRef<TypeSourceInfo *> Args,
3995 SourceLocation RParenLoc) {
3996 if (Kind <= UTT_Last)
3997 return EvaluateUnaryTypeTrait(S, Kind, KWLoc, Args[0]->getType());
3999 if (Kind <= BTT_Last)
4000 return EvaluateBinaryTypeTrait(S, Kind, Args[0]->getType(),
4001 Args[1]->getType(), RParenLoc);
4004 case clang::TT_IsConstructible:
4005 case clang::TT_IsNothrowConstructible:
4006 case clang::TT_IsTriviallyConstructible: {
4007 // C++11 [meta.unary.prop]:
4008 // is_trivially_constructible is defined as:
4010 // is_constructible<T, Args...>::value is true and the variable
4011 // definition for is_constructible, as defined below, is known to call
4012 // no operation that is not trivial.
4014 // The predicate condition for a template specialization
4015 // is_constructible<T, Args...> shall be satisfied if and only if the
4016 // following variable definition would be well-formed for some invented
4019 // T t(create<Args>()...);
4020 assert(!Args.empty());
4022 // Precondition: T and all types in the parameter pack Args shall be
4023 // complete types, (possibly cv-qualified) void, or arrays of
4025 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
4026 QualType ArgTy = Args[I]->getType();
4027 if (ArgTy->isVoidType() || ArgTy->isIncompleteArrayType())
4030 if (S.RequireCompleteType(KWLoc, ArgTy,
4031 diag::err_incomplete_type_used_in_type_trait_expr))
4035 // Make sure the first argument is a complete type.
4036 if (Args[0]->getType()->isIncompleteType())
4039 // Make sure the first argument is not an abstract type.
4040 CXXRecordDecl *RD = Args[0]->getType()->getAsCXXRecordDecl();
4041 if (RD && RD->isAbstract())
4044 SmallVector<OpaqueValueExpr, 2> OpaqueArgExprs;
4045 SmallVector<Expr *, 2> ArgExprs;
4046 ArgExprs.reserve(Args.size() - 1);
4047 for (unsigned I = 1, N = Args.size(); I != N; ++I) {
4048 QualType T = Args[I]->getType();
4049 if (T->isObjectType() || T->isFunctionType())
4050 T = S.Context.getRValueReferenceType(T);
4051 OpaqueArgExprs.push_back(
4052 OpaqueValueExpr(Args[I]->getTypeLoc().getLocStart(),
4053 T.getNonLValueExprType(S.Context),
4054 Expr::getValueKindForType(T)));
4056 for (Expr &E : OpaqueArgExprs)
4057 ArgExprs.push_back(&E);
4059 // Perform the initialization in an unevaluated context within a SFINAE
4060 // trap at translation unit scope.
4061 EnterExpressionEvaluationContext Unevaluated(S, Sema::Unevaluated);
4062 Sema::SFINAETrap SFINAE(S, /*AccessCheckingSFINAE=*/true);
4063 Sema::ContextRAII TUContext(S, S.Context.getTranslationUnitDecl());
4064 InitializedEntity To(InitializedEntity::InitializeTemporary(Args[0]));
4065 InitializationKind InitKind(InitializationKind::CreateDirect(KWLoc, KWLoc,
4067 InitializationSequence Init(S, To, InitKind, ArgExprs);
4071 ExprResult Result = Init.Perform(S, To, InitKind, ArgExprs);
4072 if (Result.isInvalid() || SFINAE.hasErrorOccurred())
4075 if (Kind == clang::TT_IsConstructible)
4078 if (Kind == clang::TT_IsNothrowConstructible)
4079 return S.canThrow(Result.get()) == CT_Cannot;
4081 if (Kind == clang::TT_IsTriviallyConstructible) {
4082 // Under Objective-C ARC, if the destination has non-trivial Objective-C
4083 // lifetime, this is a non-trivial construction.
4084 if (S.getLangOpts().ObjCAutoRefCount &&
4085 hasNontrivialObjCLifetime(Args[0]->getType().getNonReferenceType()))
4088 // The initialization succeeded; now make sure there are no non-trivial
4090 return !Result.get()->hasNonTrivialCall(S.Context);
4093 llvm_unreachable("unhandled type trait");
4096 default: llvm_unreachable("not a TT");
4102 ExprResult Sema::BuildTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
4103 ArrayRef<TypeSourceInfo *> Args,
4104 SourceLocation RParenLoc) {
4105 QualType ResultType = Context.getLogicalOperationType();
4107 if (Kind <= UTT_Last && !CheckUnaryTypeTraitTypeCompleteness(
4108 *this, Kind, KWLoc, Args[0]->getType()))
4111 bool Dependent = false;
4112 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
4113 if (Args[I]->getType()->isDependentType()) {
4119 bool Result = false;
4121 Result = evaluateTypeTrait(*this, Kind, KWLoc, Args, RParenLoc);
4123 return TypeTraitExpr::Create(Context, ResultType, KWLoc, Kind, Args,
4127 ExprResult Sema::ActOnTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
4128 ArrayRef<ParsedType> Args,
4129 SourceLocation RParenLoc) {
4130 SmallVector<TypeSourceInfo *, 4> ConvertedArgs;
4131 ConvertedArgs.reserve(Args.size());
4133 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
4134 TypeSourceInfo *TInfo;
4135 QualType T = GetTypeFromParser(Args[I], &TInfo);
4137 TInfo = Context.getTrivialTypeSourceInfo(T, KWLoc);
4139 ConvertedArgs.push_back(TInfo);
4142 return BuildTypeTrait(Kind, KWLoc, ConvertedArgs, RParenLoc);
4145 static bool EvaluateBinaryTypeTrait(Sema &Self, TypeTrait BTT, QualType LhsT,
4146 QualType RhsT, SourceLocation KeyLoc) {
4147 assert(!LhsT->isDependentType() && !RhsT->isDependentType() &&
4148 "Cannot evaluate traits of dependent types");
4151 case BTT_IsBaseOf: {
4152 // C++0x [meta.rel]p2
4153 // Base is a base class of Derived without regard to cv-qualifiers or
4154 // Base and Derived are not unions and name the same class type without
4155 // regard to cv-qualifiers.
4157 const RecordType *lhsRecord = LhsT->getAs<RecordType>();
4158 if (!lhsRecord) return false;
4160 const RecordType *rhsRecord = RhsT->getAs<RecordType>();
4161 if (!rhsRecord) return false;
4163 assert(Self.Context.hasSameUnqualifiedType(LhsT, RhsT)
4164 == (lhsRecord == rhsRecord));
4166 if (lhsRecord == rhsRecord)
4167 return !lhsRecord->getDecl()->isUnion();
4169 // C++0x [meta.rel]p2:
4170 // If Base and Derived are class types and are different types
4171 // (ignoring possible cv-qualifiers) then Derived shall be a
4173 if (Self.RequireCompleteType(KeyLoc, RhsT,
4174 diag::err_incomplete_type_used_in_type_trait_expr))
4177 return cast<CXXRecordDecl>(rhsRecord->getDecl())
4178 ->isDerivedFrom(cast<CXXRecordDecl>(lhsRecord->getDecl()));
4181 return Self.Context.hasSameType(LhsT, RhsT);
4182 case BTT_TypeCompatible:
4183 return Self.Context.typesAreCompatible(LhsT.getUnqualifiedType(),
4184 RhsT.getUnqualifiedType());
4185 case BTT_IsConvertible:
4186 case BTT_IsConvertibleTo: {
4187 // C++0x [meta.rel]p4:
4188 // Given the following function prototype:
4190 // template <class T>
4191 // typename add_rvalue_reference<T>::type create();
4193 // the predicate condition for a template specialization
4194 // is_convertible<From, To> shall be satisfied if and only if
4195 // the return expression in the following code would be
4196 // well-formed, including any implicit conversions to the return
4197 // type of the function:
4200 // return create<From>();
4203 // Access checking is performed as if in a context unrelated to To and
4204 // From. Only the validity of the immediate context of the expression
4205 // of the return-statement (including conversions to the return type)
4208 // We model the initialization as a copy-initialization of a temporary
4209 // of the appropriate type, which for this expression is identical to the
4210 // return statement (since NRVO doesn't apply).
4212 // Functions aren't allowed to return function or array types.
4213 if (RhsT->isFunctionType() || RhsT->isArrayType())
4216 // A return statement in a void function must have void type.
4217 if (RhsT->isVoidType())
4218 return LhsT->isVoidType();
4220 // A function definition requires a complete, non-abstract return type.
4221 if (Self.RequireCompleteType(KeyLoc, RhsT, 0) ||
4222 Self.RequireNonAbstractType(KeyLoc, RhsT, 0))
4225 // Compute the result of add_rvalue_reference.
4226 if (LhsT->isObjectType() || LhsT->isFunctionType())
4227 LhsT = Self.Context.getRValueReferenceType(LhsT);
4229 // Build a fake source and destination for initialization.
4230 InitializedEntity To(InitializedEntity::InitializeTemporary(RhsT));
4231 OpaqueValueExpr From(KeyLoc, LhsT.getNonLValueExprType(Self.Context),
4232 Expr::getValueKindForType(LhsT));
4233 Expr *FromPtr = &From;
4234 InitializationKind Kind(InitializationKind::CreateCopy(KeyLoc,
4237 // Perform the initialization in an unevaluated context within a SFINAE
4238 // trap at translation unit scope.
4239 EnterExpressionEvaluationContext Unevaluated(Self, Sema::Unevaluated);
4240 Sema::SFINAETrap SFINAE(Self, /*AccessCheckingSFINAE=*/true);
4241 Sema::ContextRAII TUContext(Self, Self.Context.getTranslationUnitDecl());
4242 InitializationSequence Init(Self, To, Kind, FromPtr);
4246 ExprResult Result = Init.Perform(Self, To, Kind, FromPtr);
4247 return !Result.isInvalid() && !SFINAE.hasErrorOccurred();
4250 case BTT_IsNothrowAssignable:
4251 case BTT_IsTriviallyAssignable: {
4252 // C++11 [meta.unary.prop]p3:
4253 // is_trivially_assignable is defined as:
4254 // is_assignable<T, U>::value is true and the assignment, as defined by
4255 // is_assignable, is known to call no operation that is not trivial
4257 // is_assignable is defined as:
4258 // The expression declval<T>() = declval<U>() is well-formed when
4259 // treated as an unevaluated operand (Clause 5).
4261 // For both, T and U shall be complete types, (possibly cv-qualified)
4262 // void, or arrays of unknown bound.
4263 if (!LhsT->isVoidType() && !LhsT->isIncompleteArrayType() &&
4264 Self.RequireCompleteType(KeyLoc, LhsT,
4265 diag::err_incomplete_type_used_in_type_trait_expr))
4267 if (!RhsT->isVoidType() && !RhsT->isIncompleteArrayType() &&
4268 Self.RequireCompleteType(KeyLoc, RhsT,
4269 diag::err_incomplete_type_used_in_type_trait_expr))
4272 // cv void is never assignable.
4273 if (LhsT->isVoidType() || RhsT->isVoidType())
4276 // Build expressions that emulate the effect of declval<T>() and
4278 if (LhsT->isObjectType() || LhsT->isFunctionType())
4279 LhsT = Self.Context.getRValueReferenceType(LhsT);
4280 if (RhsT->isObjectType() || RhsT->isFunctionType())
4281 RhsT = Self.Context.getRValueReferenceType(RhsT);
4282 OpaqueValueExpr Lhs(KeyLoc, LhsT.getNonLValueExprType(Self.Context),
4283 Expr::getValueKindForType(LhsT));
4284 OpaqueValueExpr Rhs(KeyLoc, RhsT.getNonLValueExprType(Self.Context),
4285 Expr::getValueKindForType(RhsT));
4287 // Attempt the assignment in an unevaluated context within a SFINAE
4288 // trap at translation unit scope.
4289 EnterExpressionEvaluationContext Unevaluated(Self, Sema::Unevaluated);
4290 Sema::SFINAETrap SFINAE(Self, /*AccessCheckingSFINAE=*/true);
4291 Sema::ContextRAII TUContext(Self, Self.Context.getTranslationUnitDecl());
4292 ExprResult Result = Self.BuildBinOp(/*S=*/nullptr, KeyLoc, BO_Assign, &Lhs,
4294 if (Result.isInvalid() || SFINAE.hasErrorOccurred())
4297 if (BTT == BTT_IsNothrowAssignable)
4298 return Self.canThrow(Result.get()) == CT_Cannot;
4300 if (BTT == BTT_IsTriviallyAssignable) {
4301 // Under Objective-C ARC, if the destination has non-trivial Objective-C
4302 // lifetime, this is a non-trivial assignment.
4303 if (Self.getLangOpts().ObjCAutoRefCount &&
4304 hasNontrivialObjCLifetime(LhsT.getNonReferenceType()))
4307 return !Result.get()->hasNonTrivialCall(Self.Context);
4310 llvm_unreachable("unhandled type trait");
4313 default: llvm_unreachable("not a BTT");
4315 llvm_unreachable("Unknown type trait or not implemented");
4318 ExprResult Sema::ActOnArrayTypeTrait(ArrayTypeTrait ATT,
4319 SourceLocation KWLoc,
4322 SourceLocation RParen) {
4323 TypeSourceInfo *TSInfo;
4324 QualType T = GetTypeFromParser(Ty, &TSInfo);
4326 TSInfo = Context.getTrivialTypeSourceInfo(T);
4328 return BuildArrayTypeTrait(ATT, KWLoc, TSInfo, DimExpr, RParen);
4331 static uint64_t EvaluateArrayTypeTrait(Sema &Self, ArrayTypeTrait ATT,
4332 QualType T, Expr *DimExpr,
4333 SourceLocation KeyLoc) {
4334 assert(!T->isDependentType() && "Cannot evaluate traits of dependent type");
4338 if (T->isArrayType()) {
4340 while (const ArrayType *AT = Self.Context.getAsArrayType(T)) {
4342 T = AT->getElementType();
4348 case ATT_ArrayExtent: {
4351 if (Self.VerifyIntegerConstantExpression(DimExpr, &Value,
4352 diag::err_dimension_expr_not_constant_integer,
4355 if (Value.isSigned() && Value.isNegative()) {
4356 Self.Diag(KeyLoc, diag::err_dimension_expr_not_constant_integer)
4357 << DimExpr->getSourceRange();
4360 Dim = Value.getLimitedValue();
4362 if (T->isArrayType()) {
4364 bool Matched = false;
4365 while (const ArrayType *AT = Self.Context.getAsArrayType(T)) {
4371 T = AT->getElementType();
4374 if (Matched && T->isArrayType()) {
4375 if (const ConstantArrayType *CAT = Self.Context.getAsConstantArrayType(T))
4376 return CAT->getSize().getLimitedValue();
4382 llvm_unreachable("Unknown type trait or not implemented");
4385 ExprResult Sema::BuildArrayTypeTrait(ArrayTypeTrait ATT,
4386 SourceLocation KWLoc,
4387 TypeSourceInfo *TSInfo,
4389 SourceLocation RParen) {
4390 QualType T = TSInfo->getType();
4392 // FIXME: This should likely be tracked as an APInt to remove any host
4393 // assumptions about the width of size_t on the target.
4395 if (!T->isDependentType())
4396 Value = EvaluateArrayTypeTrait(*this, ATT, T, DimExpr, KWLoc);
4398 // While the specification for these traits from the Embarcadero C++
4399 // compiler's documentation says the return type is 'unsigned int', Clang
4400 // returns 'size_t'. On Windows, the primary platform for the Embarcadero
4401 // compiler, there is no difference. On several other platforms this is an
4402 // important distinction.
4403 return new (Context) ArrayTypeTraitExpr(KWLoc, ATT, TSInfo, Value, DimExpr,
4404 RParen, Context.getSizeType());
4407 ExprResult Sema::ActOnExpressionTrait(ExpressionTrait ET,
4408 SourceLocation KWLoc,
4410 SourceLocation RParen) {
4411 // If error parsing the expression, ignore.
4415 ExprResult Result = BuildExpressionTrait(ET, KWLoc, Queried, RParen);
4420 static bool EvaluateExpressionTrait(ExpressionTrait ET, Expr *E) {
4422 case ET_IsLValueExpr: return E->isLValue();
4423 case ET_IsRValueExpr: return E->isRValue();
4425 llvm_unreachable("Expression trait not covered by switch");
4428 ExprResult Sema::BuildExpressionTrait(ExpressionTrait ET,
4429 SourceLocation KWLoc,
4431 SourceLocation RParen) {
4432 if (Queried->isTypeDependent()) {
4433 // Delay type-checking for type-dependent expressions.
4434 } else if (Queried->getType()->isPlaceholderType()) {
4435 ExprResult PE = CheckPlaceholderExpr(Queried);
4436 if (PE.isInvalid()) return ExprError();
4437 return BuildExpressionTrait(ET, KWLoc, PE.get(), RParen);
4440 bool Value = EvaluateExpressionTrait(ET, Queried);
4442 return new (Context)
4443 ExpressionTraitExpr(KWLoc, ET, Queried, Value, RParen, Context.BoolTy);
4446 QualType Sema::CheckPointerToMemberOperands(ExprResult &LHS, ExprResult &RHS,
4450 assert(!LHS.get()->getType()->isPlaceholderType() &&
4451 !RHS.get()->getType()->isPlaceholderType() &&
4452 "placeholders should have been weeded out by now");
4454 // The LHS undergoes lvalue conversions if this is ->*.
4456 LHS = DefaultLvalueConversion(LHS.get());
4457 if (LHS.isInvalid()) return QualType();
4460 // The RHS always undergoes lvalue conversions.
4461 RHS = DefaultLvalueConversion(RHS.get());
4462 if (RHS.isInvalid()) return QualType();
4464 const char *OpSpelling = isIndirect ? "->*" : ".*";
4466 // The binary operator .* [p3: ->*] binds its second operand, which shall
4467 // be of type "pointer to member of T" (where T is a completely-defined
4468 // class type) [...]
4469 QualType RHSType = RHS.get()->getType();
4470 const MemberPointerType *MemPtr = RHSType->getAs<MemberPointerType>();
4472 Diag(Loc, diag::err_bad_memptr_rhs)
4473 << OpSpelling << RHSType << RHS.get()->getSourceRange();
4477 QualType Class(MemPtr->getClass(), 0);
4479 // Note: C++ [expr.mptr.oper]p2-3 says that the class type into which the
4480 // member pointer points must be completely-defined. However, there is no
4481 // reason for this semantic distinction, and the rule is not enforced by
4482 // other compilers. Therefore, we do not check this property, as it is
4483 // likely to be considered a defect.
4486 // [...] to its first operand, which shall be of class T or of a class of
4487 // which T is an unambiguous and accessible base class. [p3: a pointer to
4489 QualType LHSType = LHS.get()->getType();
4491 if (const PointerType *Ptr = LHSType->getAs<PointerType>())
4492 LHSType = Ptr->getPointeeType();
4494 Diag(Loc, diag::err_bad_memptr_lhs)
4495 << OpSpelling << 1 << LHSType
4496 << FixItHint::CreateReplacement(SourceRange(Loc), ".*");
4501 if (!Context.hasSameUnqualifiedType(Class, LHSType)) {
4502 // If we want to check the hierarchy, we need a complete type.
4503 if (RequireCompleteType(Loc, LHSType, diag::err_bad_memptr_lhs,
4504 OpSpelling, (int)isIndirect)) {
4508 if (!IsDerivedFrom(LHSType, Class)) {
4509 Diag(Loc, diag::err_bad_memptr_lhs) << OpSpelling
4510 << (int)isIndirect << LHS.get()->getType();
4514 CXXCastPath BasePath;
4515 if (CheckDerivedToBaseConversion(LHSType, Class, Loc,
4516 SourceRange(LHS.get()->getLocStart(),
4517 RHS.get()->getLocEnd()),
4521 // Cast LHS to type of use.
4522 QualType UseType = isIndirect ? Context.getPointerType(Class) : Class;
4523 ExprValueKind VK = isIndirect ? VK_RValue : LHS.get()->getValueKind();
4524 LHS = ImpCastExprToType(LHS.get(), UseType, CK_DerivedToBase, VK,
4528 if (isa<CXXScalarValueInitExpr>(RHS.get()->IgnoreParens())) {
4529 // Diagnose use of pointer-to-member type which when used as
4530 // the functional cast in a pointer-to-member expression.
4531 Diag(Loc, diag::err_pointer_to_member_type) << isIndirect;
4536 // The result is an object or a function of the type specified by the
4538 // The cv qualifiers are the union of those in the pointer and the left side,
4539 // in accordance with 5.5p5 and 5.2.5.
4540 QualType Result = MemPtr->getPointeeType();
4541 Result = Context.getCVRQualifiedType(Result, LHSType.getCVRQualifiers());
4543 // C++0x [expr.mptr.oper]p6:
4544 // In a .* expression whose object expression is an rvalue, the program is
4545 // ill-formed if the second operand is a pointer to member function with
4546 // ref-qualifier &. In a ->* expression or in a .* expression whose object
4547 // expression is an lvalue, the program is ill-formed if the second operand
4548 // is a pointer to member function with ref-qualifier &&.
4549 if (const FunctionProtoType *Proto = Result->getAs<FunctionProtoType>()) {
4550 switch (Proto->getRefQualifier()) {
4556 if (!isIndirect && !LHS.get()->Classify(Context).isLValue())
4557 Diag(Loc, diag::err_pointer_to_member_oper_value_classify)
4558 << RHSType << 1 << LHS.get()->getSourceRange();
4562 if (isIndirect || !LHS.get()->Classify(Context).isRValue())
4563 Diag(Loc, diag::err_pointer_to_member_oper_value_classify)
4564 << RHSType << 0 << LHS.get()->getSourceRange();
4569 // C++ [expr.mptr.oper]p6:
4570 // The result of a .* expression whose second operand is a pointer
4571 // to a data member is of the same value category as its
4572 // first operand. The result of a .* expression whose second
4573 // operand is a pointer to a member function is a prvalue. The
4574 // result of an ->* expression is an lvalue if its second operand
4575 // is a pointer to data member and a prvalue otherwise.
4576 if (Result->isFunctionType()) {
4578 return Context.BoundMemberTy;
4579 } else if (isIndirect) {
4582 VK = LHS.get()->getValueKind();
4588 /// \brief Try to convert a type to another according to C++0x 5.16p3.
4590 /// This is part of the parameter validation for the ? operator. If either
4591 /// value operand is a class type, the two operands are attempted to be
4592 /// converted to each other. This function does the conversion in one direction.
4593 /// It returns true if the program is ill-formed and has already been diagnosed
4595 static bool TryClassUnification(Sema &Self, Expr *From, Expr *To,
4596 SourceLocation QuestionLoc,
4597 bool &HaveConversion,
4599 HaveConversion = false;
4600 ToType = To->getType();
4602 InitializationKind Kind = InitializationKind::CreateCopy(To->getLocStart(),
4605 // The process for determining whether an operand expression E1 of type T1
4606 // can be converted to match an operand expression E2 of type T2 is defined
4608 // -- If E2 is an lvalue:
4609 bool ToIsLvalue = To->isLValue();
4611 // E1 can be converted to match E2 if E1 can be implicitly converted to
4612 // type "lvalue reference to T2", subject to the constraint that in the
4613 // conversion the reference must bind directly to E1.
4614 QualType T = Self.Context.getLValueReferenceType(ToType);
4615 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T);
4617 InitializationSequence InitSeq(Self, Entity, Kind, From);
4618 if (InitSeq.isDirectReferenceBinding()) {
4620 HaveConversion = true;
4624 if (InitSeq.isAmbiguous())
4625 return InitSeq.Diagnose(Self, Entity, Kind, From);
4628 // -- If E2 is an rvalue, or if the conversion above cannot be done:
4629 // -- if E1 and E2 have class type, and the underlying class types are
4630 // the same or one is a base class of the other:
4631 QualType FTy = From->getType();
4632 QualType TTy = To->getType();
4633 const RecordType *FRec = FTy->getAs<RecordType>();
4634 const RecordType *TRec = TTy->getAs<RecordType>();
4635 bool FDerivedFromT = FRec && TRec && FRec != TRec &&
4636 Self.IsDerivedFrom(FTy, TTy);
4638 (FRec == TRec || FDerivedFromT || Self.IsDerivedFrom(TTy, FTy))) {
4639 // E1 can be converted to match E2 if the class of T2 is the
4640 // same type as, or a base class of, the class of T1, and
4642 if (FRec == TRec || FDerivedFromT) {
4643 if (TTy.isAtLeastAsQualifiedAs(FTy)) {
4644 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy);
4645 InitializationSequence InitSeq(Self, Entity, Kind, From);
4647 HaveConversion = true;
4651 if (InitSeq.isAmbiguous())
4652 return InitSeq.Diagnose(Self, Entity, Kind, From);
4659 // -- Otherwise: E1 can be converted to match E2 if E1 can be
4660 // implicitly converted to the type that expression E2 would have
4661 // if E2 were converted to an rvalue (or the type it has, if E2 is
4664 // This actually refers very narrowly to the lvalue-to-rvalue conversion, not
4665 // to the array-to-pointer or function-to-pointer conversions.
4666 if (!TTy->getAs<TagType>())
4667 TTy = TTy.getUnqualifiedType();
4669 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy);
4670 InitializationSequence InitSeq(Self, Entity, Kind, From);
4671 HaveConversion = !InitSeq.Failed();
4673 if (InitSeq.isAmbiguous())
4674 return InitSeq.Diagnose(Self, Entity, Kind, From);
4679 /// \brief Try to find a common type for two according to C++0x 5.16p5.
4681 /// This is part of the parameter validation for the ? operator. If either
4682 /// value operand is a class type, overload resolution is used to find a
4683 /// conversion to a common type.
4684 static bool FindConditionalOverload(Sema &Self, ExprResult &LHS, ExprResult &RHS,
4685 SourceLocation QuestionLoc) {
4686 Expr *Args[2] = { LHS.get(), RHS.get() };
4687 OverloadCandidateSet CandidateSet(QuestionLoc,
4688 OverloadCandidateSet::CSK_Operator);
4689 Self.AddBuiltinOperatorCandidates(OO_Conditional, QuestionLoc, Args,
4692 OverloadCandidateSet::iterator Best;
4693 switch (CandidateSet.BestViableFunction(Self, QuestionLoc, Best)) {
4695 // We found a match. Perform the conversions on the arguments and move on.
4697 Self.PerformImplicitConversion(LHS.get(), Best->BuiltinTypes.ParamTypes[0],
4698 Best->Conversions[0], Sema::AA_Converting);
4699 if (LHSRes.isInvalid())
4704 Self.PerformImplicitConversion(RHS.get(), Best->BuiltinTypes.ParamTypes[1],
4705 Best->Conversions[1], Sema::AA_Converting);
4706 if (RHSRes.isInvalid())
4710 Self.MarkFunctionReferenced(QuestionLoc, Best->Function);
4714 case OR_No_Viable_Function:
4716 // Emit a better diagnostic if one of the expressions is a null pointer
4717 // constant and the other is a pointer type. In this case, the user most
4718 // likely forgot to take the address of the other expression.
4719 if (Self.DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
4722 Self.Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
4723 << LHS.get()->getType() << RHS.get()->getType()
4724 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
4728 Self.Diag(QuestionLoc, diag::err_conditional_ambiguous_ovl)
4729 << LHS.get()->getType() << RHS.get()->getType()
4730 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
4731 // FIXME: Print the possible common types by printing the return types of
4732 // the viable candidates.
4736 llvm_unreachable("Conditional operator has only built-in overloads");
4741 /// \brief Perform an "extended" implicit conversion as returned by
4742 /// TryClassUnification.
4743 static bool ConvertForConditional(Sema &Self, ExprResult &E, QualType T) {
4744 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T);
4745 InitializationKind Kind = InitializationKind::CreateCopy(E.get()->getLocStart(),
4747 Expr *Arg = E.get();
4748 InitializationSequence InitSeq(Self, Entity, Kind, Arg);
4749 ExprResult Result = InitSeq.Perform(Self, Entity, Kind, Arg);
4750 if (Result.isInvalid())
4757 /// \brief Check the operands of ?: under C++ semantics.
4759 /// See C++ [expr.cond]. Note that LHS is never null, even for the GNU x ?: y
4760 /// extension. In this case, LHS == Cond. (But they're not aliases.)
4761 QualType Sema::CXXCheckConditionalOperands(ExprResult &Cond, ExprResult &LHS,
4762 ExprResult &RHS, ExprValueKind &VK,
4764 SourceLocation QuestionLoc) {
4765 // FIXME: Handle C99's complex types, vector types, block pointers and Obj-C++
4766 // interface pointers.
4768 // C++11 [expr.cond]p1
4769 // The first expression is contextually converted to bool.
4770 if (!Cond.get()->isTypeDependent()) {
4771 ExprResult CondRes = CheckCXXBooleanCondition(Cond.get());
4772 if (CondRes.isInvalid())
4781 // Either of the arguments dependent?
4782 if (LHS.get()->isTypeDependent() || RHS.get()->isTypeDependent())
4783 return Context.DependentTy;
4785 // C++11 [expr.cond]p2
4786 // If either the second or the third operand has type (cv) void, ...
4787 QualType LTy = LHS.get()->getType();
4788 QualType RTy = RHS.get()->getType();
4789 bool LVoid = LTy->isVoidType();
4790 bool RVoid = RTy->isVoidType();
4791 if (LVoid || RVoid) {
4792 // ... one of the following shall hold:
4793 // -- The second or the third operand (but not both) is a (possibly
4794 // parenthesized) throw-expression; the result is of the type
4795 // and value category of the other.
4796 bool LThrow = isa<CXXThrowExpr>(LHS.get()->IgnoreParenImpCasts());
4797 bool RThrow = isa<CXXThrowExpr>(RHS.get()->IgnoreParenImpCasts());
4798 if (LThrow != RThrow) {
4799 Expr *NonThrow = LThrow ? RHS.get() : LHS.get();
4800 VK = NonThrow->getValueKind();
4801 // DR (no number yet): the result is a bit-field if the
4802 // non-throw-expression operand is a bit-field.
4803 OK = NonThrow->getObjectKind();
4804 return NonThrow->getType();
4807 // -- Both the second and third operands have type void; the result is of
4808 // type void and is a prvalue.
4810 return Context.VoidTy;
4812 // Neither holds, error.
4813 Diag(QuestionLoc, diag::err_conditional_void_nonvoid)
4814 << (LVoid ? RTy : LTy) << (LVoid ? 0 : 1)
4815 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
4821 // C++11 [expr.cond]p3
4822 // Otherwise, if the second and third operand have different types, and
4823 // either has (cv) class type [...] an attempt is made to convert each of
4824 // those operands to the type of the other.
4825 if (!Context.hasSameType(LTy, RTy) &&
4826 (LTy->isRecordType() || RTy->isRecordType())) {
4827 // These return true if a single direction is already ambiguous.
4828 QualType L2RType, R2LType;
4829 bool HaveL2R, HaveR2L;
4830 if (TryClassUnification(*this, LHS.get(), RHS.get(), QuestionLoc, HaveL2R, L2RType))
4832 if (TryClassUnification(*this, RHS.get(), LHS.get(), QuestionLoc, HaveR2L, R2LType))
4835 // If both can be converted, [...] the program is ill-formed.
4836 if (HaveL2R && HaveR2L) {
4837 Diag(QuestionLoc, diag::err_conditional_ambiguous)
4838 << LTy << RTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
4842 // If exactly one conversion is possible, that conversion is applied to
4843 // the chosen operand and the converted operands are used in place of the
4844 // original operands for the remainder of this section.
4846 if (ConvertForConditional(*this, LHS, L2RType) || LHS.isInvalid())
4848 LTy = LHS.get()->getType();
4849 } else if (HaveR2L) {
4850 if (ConvertForConditional(*this, RHS, R2LType) || RHS.isInvalid())
4852 RTy = RHS.get()->getType();
4856 // C++11 [expr.cond]p3
4857 // if both are glvalues of the same value category and the same type except
4858 // for cv-qualification, an attempt is made to convert each of those
4859 // operands to the type of the other.
4860 ExprValueKind LVK = LHS.get()->getValueKind();
4861 ExprValueKind RVK = RHS.get()->getValueKind();
4862 if (!Context.hasSameType(LTy, RTy) &&
4863 Context.hasSameUnqualifiedType(LTy, RTy) &&
4864 LVK == RVK && LVK != VK_RValue) {
4865 // Since the unqualified types are reference-related and we require the
4866 // result to be as if a reference bound directly, the only conversion
4867 // we can perform is to add cv-qualifiers.
4868 Qualifiers LCVR = Qualifiers::fromCVRMask(LTy.getCVRQualifiers());
4869 Qualifiers RCVR = Qualifiers::fromCVRMask(RTy.getCVRQualifiers());
4870 if (RCVR.isStrictSupersetOf(LCVR)) {
4871 LHS = ImpCastExprToType(LHS.get(), RTy, CK_NoOp, LVK);
4872 LTy = LHS.get()->getType();
4874 else if (LCVR.isStrictSupersetOf(RCVR)) {
4875 RHS = ImpCastExprToType(RHS.get(), LTy, CK_NoOp, RVK);
4876 RTy = RHS.get()->getType();
4880 // C++11 [expr.cond]p4
4881 // If the second and third operands are glvalues of the same value
4882 // category and have the same type, the result is of that type and
4883 // value category and it is a bit-field if the second or the third
4884 // operand is a bit-field, or if both are bit-fields.
4885 // We only extend this to bitfields, not to the crazy other kinds of
4887 bool Same = Context.hasSameType(LTy, RTy);
4888 if (Same && LVK == RVK && LVK != VK_RValue &&
4889 LHS.get()->isOrdinaryOrBitFieldObject() &&
4890 RHS.get()->isOrdinaryOrBitFieldObject()) {
4891 VK = LHS.get()->getValueKind();
4892 if (LHS.get()->getObjectKind() == OK_BitField ||
4893 RHS.get()->getObjectKind() == OK_BitField)
4898 // C++11 [expr.cond]p5
4899 // Otherwise, the result is a prvalue. If the second and third operands
4900 // do not have the same type, and either has (cv) class type, ...
4901 if (!Same && (LTy->isRecordType() || RTy->isRecordType())) {
4902 // ... overload resolution is used to determine the conversions (if any)
4903 // to be applied to the operands. If the overload resolution fails, the
4904 // program is ill-formed.
4905 if (FindConditionalOverload(*this, LHS, RHS, QuestionLoc))
4909 // C++11 [expr.cond]p6
4910 // Lvalue-to-rvalue, array-to-pointer, and function-to-pointer standard
4911 // conversions are performed on the second and third operands.
4912 LHS = DefaultFunctionArrayLvalueConversion(LHS.get());
4913 RHS = DefaultFunctionArrayLvalueConversion(RHS.get());
4914 if (LHS.isInvalid() || RHS.isInvalid())
4916 LTy = LHS.get()->getType();
4917 RTy = RHS.get()->getType();
4919 // After those conversions, one of the following shall hold:
4920 // -- The second and third operands have the same type; the result
4921 // is of that type. If the operands have class type, the result
4922 // is a prvalue temporary of the result type, which is
4923 // copy-initialized from either the second operand or the third
4924 // operand depending on the value of the first operand.
4925 if (Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy)) {
4926 if (LTy->isRecordType()) {
4927 // The operands have class type. Make a temporary copy.
4928 if (RequireNonAbstractType(QuestionLoc, LTy,
4929 diag::err_allocation_of_abstract_type))
4931 InitializedEntity Entity = InitializedEntity::InitializeTemporary(LTy);
4933 ExprResult LHSCopy = PerformCopyInitialization(Entity,
4936 if (LHSCopy.isInvalid())
4939 ExprResult RHSCopy = PerformCopyInitialization(Entity,
4942 if (RHSCopy.isInvalid())
4952 // Extension: conditional operator involving vector types.
4953 if (LTy->isVectorType() || RTy->isVectorType())
4954 return CheckVectorOperands(LHS, RHS, QuestionLoc, /*isCompAssign*/false);
4956 // -- The second and third operands have arithmetic or enumeration type;
4957 // the usual arithmetic conversions are performed to bring them to a
4958 // common type, and the result is of that type.
4959 if (LTy->isArithmeticType() && RTy->isArithmeticType()) {
4960 QualType ResTy = UsualArithmeticConversions(LHS, RHS);
4961 if (LHS.isInvalid() || RHS.isInvalid())
4964 LHS = ImpCastExprToType(LHS.get(), ResTy, PrepareScalarCast(LHS, ResTy));
4965 RHS = ImpCastExprToType(RHS.get(), ResTy, PrepareScalarCast(RHS, ResTy));
4970 // -- The second and third operands have pointer type, or one has pointer
4971 // type and the other is a null pointer constant, or both are null
4972 // pointer constants, at least one of which is non-integral; pointer
4973 // conversions and qualification conversions are performed to bring them
4974 // to their composite pointer type. The result is of the composite
4976 // -- The second and third operands have pointer to member type, or one has
4977 // pointer to member type and the other is a null pointer constant;
4978 // pointer to member conversions and qualification conversions are
4979 // performed to bring them to a common type, whose cv-qualification
4980 // shall match the cv-qualification of either the second or the third
4981 // operand. The result is of the common type.
4982 bool NonStandardCompositeType = false;
4983 QualType Composite = FindCompositePointerType(QuestionLoc, LHS, RHS,
4984 isSFINAEContext() ? nullptr
4985 : &NonStandardCompositeType);
4986 if (!Composite.isNull()) {
4987 if (NonStandardCompositeType)
4989 diag::ext_typecheck_cond_incompatible_operands_nonstandard)
4990 << LTy << RTy << Composite
4991 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
4996 // Similarly, attempt to find composite type of two objective-c pointers.
4997 Composite = FindCompositeObjCPointerType(LHS, RHS, QuestionLoc);
4998 if (!Composite.isNull())
5001 // Check if we are using a null with a non-pointer type.
5002 if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
5005 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
5006 << LHS.get()->getType() << RHS.get()->getType()
5007 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
5011 /// \brief Find a merged pointer type and convert the two expressions to it.
5013 /// This finds the composite pointer type (or member pointer type) for @p E1
5014 /// and @p E2 according to C++11 5.9p2. It converts both expressions to this
5015 /// type and returns it.
5016 /// It does not emit diagnostics.
5018 /// \param Loc The location of the operator requiring these two expressions to
5019 /// be converted to the composite pointer type.
5021 /// If \p NonStandardCompositeType is non-NULL, then we are permitted to find
5022 /// a non-standard (but still sane) composite type to which both expressions
5023 /// can be converted. When such a type is chosen, \c *NonStandardCompositeType
5024 /// will be set true.
5025 QualType Sema::FindCompositePointerType(SourceLocation Loc,
5026 Expr *&E1, Expr *&E2,
5027 bool *NonStandardCompositeType) {
5028 if (NonStandardCompositeType)
5029 *NonStandardCompositeType = false;
5031 assert(getLangOpts().CPlusPlus && "This function assumes C++");
5032 QualType T1 = E1->getType(), T2 = E2->getType();
5035 // Pointer conversions and qualification conversions are performed on
5036 // pointer operands to bring them to their composite pointer type. If
5037 // one operand is a null pointer constant, the composite pointer type is
5038 // std::nullptr_t if the other operand is also a null pointer constant or,
5039 // if the other operand is a pointer, the type of the other operand.
5040 if (!T1->isAnyPointerType() && !T1->isMemberPointerType() &&
5041 !T2->isAnyPointerType() && !T2->isMemberPointerType()) {
5042 if (T1->isNullPtrType() &&
5043 E2->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
5044 E2 = ImpCastExprToType(E2, T1, CK_NullToPointer).get();
5047 if (T2->isNullPtrType() &&
5048 E1->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
5049 E1 = ImpCastExprToType(E1, T2, CK_NullToPointer).get();
5055 if (E1->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
5056 if (T2->isMemberPointerType())
5057 E1 = ImpCastExprToType(E1, T2, CK_NullToMemberPointer).get();
5059 E1 = ImpCastExprToType(E1, T2, CK_NullToPointer).get();
5062 if (E2->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
5063 if (T1->isMemberPointerType())
5064 E2 = ImpCastExprToType(E2, T1, CK_NullToMemberPointer).get();
5066 E2 = ImpCastExprToType(E2, T1, CK_NullToPointer).get();
5070 // Now both have to be pointers or member pointers.
5071 if ((!T1->isPointerType() && !T1->isMemberPointerType()) ||
5072 (!T2->isPointerType() && !T2->isMemberPointerType()))
5075 // Otherwise, of one of the operands has type "pointer to cv1 void," then
5076 // the other has type "pointer to cv2 T" and the composite pointer type is
5077 // "pointer to cv12 void," where cv12 is the union of cv1 and cv2.
5078 // Otherwise, the composite pointer type is a pointer type similar to the
5079 // type of one of the operands, with a cv-qualification signature that is
5080 // the union of the cv-qualification signatures of the operand types.
5081 // In practice, the first part here is redundant; it's subsumed by the second.
5082 // What we do here is, we build the two possible composite types, and try the
5083 // conversions in both directions. If only one works, or if the two composite
5084 // types are the same, we have succeeded.
5085 // FIXME: extended qualifiers?
5086 typedef SmallVector<unsigned, 4> QualifierVector;
5087 QualifierVector QualifierUnion;
5088 typedef SmallVector<std::pair<const Type *, const Type *>, 4>
5089 ContainingClassVector;
5090 ContainingClassVector MemberOfClass;
5091 QualType Composite1 = Context.getCanonicalType(T1),
5092 Composite2 = Context.getCanonicalType(T2);
5093 unsigned NeedConstBefore = 0;
5095 const PointerType *Ptr1, *Ptr2;
5096 if ((Ptr1 = Composite1->getAs<PointerType>()) &&
5097 (Ptr2 = Composite2->getAs<PointerType>())) {
5098 Composite1 = Ptr1->getPointeeType();
5099 Composite2 = Ptr2->getPointeeType();
5101 // If we're allowed to create a non-standard composite type, keep track
5102 // of where we need to fill in additional 'const' qualifiers.
5103 if (NonStandardCompositeType &&
5104 Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers())
5105 NeedConstBefore = QualifierUnion.size();
5107 QualifierUnion.push_back(
5108 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
5109 MemberOfClass.push_back(std::make_pair(nullptr, nullptr));
5113 const MemberPointerType *MemPtr1, *MemPtr2;
5114 if ((MemPtr1 = Composite1->getAs<MemberPointerType>()) &&
5115 (MemPtr2 = Composite2->getAs<MemberPointerType>())) {
5116 Composite1 = MemPtr1->getPointeeType();
5117 Composite2 = MemPtr2->getPointeeType();
5119 // If we're allowed to create a non-standard composite type, keep track
5120 // of where we need to fill in additional 'const' qualifiers.
5121 if (NonStandardCompositeType &&
5122 Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers())
5123 NeedConstBefore = QualifierUnion.size();
5125 QualifierUnion.push_back(
5126 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
5127 MemberOfClass.push_back(std::make_pair(MemPtr1->getClass(),
5128 MemPtr2->getClass()));
5132 // FIXME: block pointer types?
5134 // Cannot unwrap any more types.
5138 if (NeedConstBefore && NonStandardCompositeType) {
5139 // Extension: Add 'const' to qualifiers that come before the first qualifier
5140 // mismatch, so that our (non-standard!) composite type meets the
5141 // requirements of C++ [conv.qual]p4 bullet 3.
5142 for (unsigned I = 0; I != NeedConstBefore; ++I) {
5143 if ((QualifierUnion[I] & Qualifiers::Const) == 0) {
5144 QualifierUnion[I] = QualifierUnion[I] | Qualifiers::Const;
5145 *NonStandardCompositeType = true;
5150 // Rewrap the composites as pointers or member pointers with the union CVRs.
5151 ContainingClassVector::reverse_iterator MOC
5152 = MemberOfClass.rbegin();
5153 for (QualifierVector::reverse_iterator
5154 I = QualifierUnion.rbegin(),
5155 E = QualifierUnion.rend();
5156 I != E; (void)++I, ++MOC) {
5157 Qualifiers Quals = Qualifiers::fromCVRMask(*I);
5158 if (MOC->first && MOC->second) {
5159 // Rebuild member pointer type
5160 Composite1 = Context.getMemberPointerType(
5161 Context.getQualifiedType(Composite1, Quals),
5163 Composite2 = Context.getMemberPointerType(
5164 Context.getQualifiedType(Composite2, Quals),
5167 // Rebuild pointer type
5169 = Context.getPointerType(Context.getQualifiedType(Composite1, Quals));
5171 = Context.getPointerType(Context.getQualifiedType(Composite2, Quals));
5175 // Try to convert to the first composite pointer type.
5176 InitializedEntity Entity1
5177 = InitializedEntity::InitializeTemporary(Composite1);
5178 InitializationKind Kind
5179 = InitializationKind::CreateCopy(Loc, SourceLocation());
5180 InitializationSequence E1ToC1(*this, Entity1, Kind, E1);
5181 InitializationSequence E2ToC1(*this, Entity1, Kind, E2);
5183 if (E1ToC1 && E2ToC1) {
5184 // Conversion to Composite1 is viable.
5185 if (!Context.hasSameType(Composite1, Composite2)) {
5186 // Composite2 is a different type from Composite1. Check whether
5187 // Composite2 is also viable.
5188 InitializedEntity Entity2
5189 = InitializedEntity::InitializeTemporary(Composite2);
5190 InitializationSequence E1ToC2(*this, Entity2, Kind, E1);
5191 InitializationSequence E2ToC2(*this, Entity2, Kind, E2);
5192 if (E1ToC2 && E2ToC2) {
5193 // Both Composite1 and Composite2 are viable and are different;
5194 // this is an ambiguity.
5199 // Convert E1 to Composite1
5201 = E1ToC1.Perform(*this, Entity1, Kind, E1);
5202 if (E1Result.isInvalid())
5204 E1 = E1Result.getAs<Expr>();
5206 // Convert E2 to Composite1
5208 = E2ToC1.Perform(*this, Entity1, Kind, E2);
5209 if (E2Result.isInvalid())
5211 E2 = E2Result.getAs<Expr>();
5216 // Check whether Composite2 is viable.
5217 InitializedEntity Entity2
5218 = InitializedEntity::InitializeTemporary(Composite2);
5219 InitializationSequence E1ToC2(*this, Entity2, Kind, E1);
5220 InitializationSequence E2ToC2(*this, Entity2, Kind, E2);
5221 if (!E1ToC2 || !E2ToC2)
5224 // Convert E1 to Composite2
5226 = E1ToC2.Perform(*this, Entity2, Kind, E1);
5227 if (E1Result.isInvalid())
5229 E1 = E1Result.getAs<Expr>();
5231 // Convert E2 to Composite2
5233 = E2ToC2.Perform(*this, Entity2, Kind, E2);
5234 if (E2Result.isInvalid())
5236 E2 = E2Result.getAs<Expr>();
5241 ExprResult Sema::MaybeBindToTemporary(Expr *E) {
5245 assert(!isa<CXXBindTemporaryExpr>(E) && "Double-bound temporary?");
5247 // If the result is a glvalue, we shouldn't bind it.
5251 // In ARC, calls that return a retainable type can return retained,
5252 // in which case we have to insert a consuming cast.
5253 if (getLangOpts().ObjCAutoRefCount &&
5254 E->getType()->isObjCRetainableType()) {
5256 bool ReturnsRetained;
5258 // For actual calls, we compute this by examining the type of the
5260 if (CallExpr *Call = dyn_cast<CallExpr>(E)) {
5261 Expr *Callee = Call->getCallee()->IgnoreParens();
5262 QualType T = Callee->getType();
5264 if (T == Context.BoundMemberTy) {
5265 // Handle pointer-to-members.
5266 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(Callee))
5267 T = BinOp->getRHS()->getType();
5268 else if (MemberExpr *Mem = dyn_cast<MemberExpr>(Callee))
5269 T = Mem->getMemberDecl()->getType();
5272 if (const PointerType *Ptr = T->getAs<PointerType>())
5273 T = Ptr->getPointeeType();
5274 else if (const BlockPointerType *Ptr = T->getAs<BlockPointerType>())
5275 T = Ptr->getPointeeType();
5276 else if (const MemberPointerType *MemPtr = T->getAs<MemberPointerType>())
5277 T = MemPtr->getPointeeType();
5279 const FunctionType *FTy = T->getAs<FunctionType>();
5280 assert(FTy && "call to value not of function type?");
5281 ReturnsRetained = FTy->getExtInfo().getProducesResult();
5283 // ActOnStmtExpr arranges things so that StmtExprs of retainable
5284 // type always produce a +1 object.
5285 } else if (isa<StmtExpr>(E)) {
5286 ReturnsRetained = true;
5288 // We hit this case with the lambda conversion-to-block optimization;
5289 // we don't want any extra casts here.
5290 } else if (isa<CastExpr>(E) &&
5291 isa<BlockExpr>(cast<CastExpr>(E)->getSubExpr())) {
5294 // For message sends and property references, we try to find an
5295 // actual method. FIXME: we should infer retention by selector in
5296 // cases where we don't have an actual method.
5298 ObjCMethodDecl *D = nullptr;
5299 if (ObjCMessageExpr *Send = dyn_cast<ObjCMessageExpr>(E)) {
5300 D = Send->getMethodDecl();
5301 } else if (ObjCBoxedExpr *BoxedExpr = dyn_cast<ObjCBoxedExpr>(E)) {
5302 D = BoxedExpr->getBoxingMethod();
5303 } else if (ObjCArrayLiteral *ArrayLit = dyn_cast<ObjCArrayLiteral>(E)) {
5304 D = ArrayLit->getArrayWithObjectsMethod();
5305 } else if (ObjCDictionaryLiteral *DictLit
5306 = dyn_cast<ObjCDictionaryLiteral>(E)) {
5307 D = DictLit->getDictWithObjectsMethod();
5310 ReturnsRetained = (D && D->hasAttr<NSReturnsRetainedAttr>());
5312 // Don't do reclaims on performSelector calls; despite their
5313 // return type, the invoked method doesn't necessarily actually
5314 // return an object.
5315 if (!ReturnsRetained &&
5316 D && D->getMethodFamily() == OMF_performSelector)
5320 // Don't reclaim an object of Class type.
5321 if (!ReturnsRetained && E->getType()->isObjCARCImplicitlyUnretainedType())
5324 ExprNeedsCleanups = true;
5326 CastKind ck = (ReturnsRetained ? CK_ARCConsumeObject
5327 : CK_ARCReclaimReturnedObject);
5328 return ImplicitCastExpr::Create(Context, E->getType(), ck, E, nullptr,
5332 if (!getLangOpts().CPlusPlus)
5335 // Search for the base element type (cf. ASTContext::getBaseElementType) with
5336 // a fast path for the common case that the type is directly a RecordType.
5337 const Type *T = Context.getCanonicalType(E->getType().getTypePtr());
5338 const RecordType *RT = nullptr;
5340 switch (T->getTypeClass()) {
5342 RT = cast<RecordType>(T);
5344 case Type::ConstantArray:
5345 case Type::IncompleteArray:
5346 case Type::VariableArray:
5347 case Type::DependentSizedArray:
5348 T = cast<ArrayType>(T)->getElementType().getTypePtr();
5355 // That should be enough to guarantee that this type is complete, if we're
5356 // not processing a decltype expression.
5357 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
5358 if (RD->isInvalidDecl() || RD->isDependentContext())
5361 bool IsDecltype = ExprEvalContexts.back().IsDecltype;
5362 CXXDestructorDecl *Destructor = IsDecltype ? nullptr : LookupDestructor(RD);
5365 MarkFunctionReferenced(E->getExprLoc(), Destructor);
5366 CheckDestructorAccess(E->getExprLoc(), Destructor,
5367 PDiag(diag::err_access_dtor_temp)
5369 if (DiagnoseUseOfDecl(Destructor, E->getExprLoc()))
5372 // If destructor is trivial, we can avoid the extra copy.
5373 if (Destructor->isTrivial())
5376 // We need a cleanup, but we don't need to remember the temporary.
5377 ExprNeedsCleanups = true;
5380 CXXTemporary *Temp = CXXTemporary::Create(Context, Destructor);
5381 CXXBindTemporaryExpr *Bind = CXXBindTemporaryExpr::Create(Context, Temp, E);
5384 ExprEvalContexts.back().DelayedDecltypeBinds.push_back(Bind);
5390 Sema::MaybeCreateExprWithCleanups(ExprResult SubExpr) {
5391 if (SubExpr.isInvalid())
5394 return MaybeCreateExprWithCleanups(SubExpr.get());
5397 Expr *Sema::MaybeCreateExprWithCleanups(Expr *SubExpr) {
5398 assert(SubExpr && "subexpression can't be null!");
5400 CleanupVarDeclMarking();
5402 unsigned FirstCleanup = ExprEvalContexts.back().NumCleanupObjects;
5403 assert(ExprCleanupObjects.size() >= FirstCleanup);
5404 assert(ExprNeedsCleanups || ExprCleanupObjects.size() == FirstCleanup);
5405 if (!ExprNeedsCleanups)
5408 auto Cleanups = llvm::makeArrayRef(ExprCleanupObjects.begin() + FirstCleanup,
5409 ExprCleanupObjects.size() - FirstCleanup);
5411 Expr *E = ExprWithCleanups::Create(Context, SubExpr, Cleanups);
5412 DiscardCleanupsInEvaluationContext();
5417 Stmt *Sema::MaybeCreateStmtWithCleanups(Stmt *SubStmt) {
5418 assert(SubStmt && "sub-statement can't be null!");
5420 CleanupVarDeclMarking();
5422 if (!ExprNeedsCleanups)
5425 // FIXME: In order to attach the temporaries, wrap the statement into
5426 // a StmtExpr; currently this is only used for asm statements.
5427 // This is hacky, either create a new CXXStmtWithTemporaries statement or
5428 // a new AsmStmtWithTemporaries.
5429 CompoundStmt *CompStmt = new (Context) CompoundStmt(Context, SubStmt,
5432 Expr *E = new (Context) StmtExpr(CompStmt, Context.VoidTy, SourceLocation(),
5434 return MaybeCreateExprWithCleanups(E);
5437 /// Process the expression contained within a decltype. For such expressions,
5438 /// certain semantic checks on temporaries are delayed until this point, and
5439 /// are omitted for the 'topmost' call in the decltype expression. If the
5440 /// topmost call bound a temporary, strip that temporary off the expression.
5441 ExprResult Sema::ActOnDecltypeExpression(Expr *E) {
5442 assert(ExprEvalContexts.back().IsDecltype && "not in a decltype expression");
5444 // C++11 [expr.call]p11:
5445 // If a function call is a prvalue of object type,
5446 // -- if the function call is either
5447 // -- the operand of a decltype-specifier, or
5448 // -- the right operand of a comma operator that is the operand of a
5449 // decltype-specifier,
5450 // a temporary object is not introduced for the prvalue.
5452 // Recursively rebuild ParenExprs and comma expressions to strip out the
5453 // outermost CXXBindTemporaryExpr, if any.
5454 if (ParenExpr *PE = dyn_cast<ParenExpr>(E)) {
5455 ExprResult SubExpr = ActOnDecltypeExpression(PE->getSubExpr());
5456 if (SubExpr.isInvalid())
5458 if (SubExpr.get() == PE->getSubExpr())
5460 return ActOnParenExpr(PE->getLParen(), PE->getRParen(), SubExpr.get());
5462 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
5463 if (BO->getOpcode() == BO_Comma) {
5464 ExprResult RHS = ActOnDecltypeExpression(BO->getRHS());
5465 if (RHS.isInvalid())
5467 if (RHS.get() == BO->getRHS())
5469 return new (Context) BinaryOperator(
5470 BO->getLHS(), RHS.get(), BO_Comma, BO->getType(), BO->getValueKind(),
5471 BO->getObjectKind(), BO->getOperatorLoc(), BO->isFPContractable());
5475 CXXBindTemporaryExpr *TopBind = dyn_cast<CXXBindTemporaryExpr>(E);
5476 CallExpr *TopCall = TopBind ? dyn_cast<CallExpr>(TopBind->getSubExpr())
5483 // Disable the special decltype handling now.
5484 ExprEvalContexts.back().IsDecltype = false;
5486 // In MS mode, don't perform any extra checking of call return types within a
5487 // decltype expression.
5488 if (getLangOpts().MSVCCompat)
5491 // Perform the semantic checks we delayed until this point.
5492 for (unsigned I = 0, N = ExprEvalContexts.back().DelayedDecltypeCalls.size();
5494 CallExpr *Call = ExprEvalContexts.back().DelayedDecltypeCalls[I];
5495 if (Call == TopCall)
5498 if (CheckCallReturnType(Call->getCallReturnType(Context),
5499 Call->getLocStart(),
5500 Call, Call->getDirectCallee()))
5504 // Now all relevant types are complete, check the destructors are accessible
5505 // and non-deleted, and annotate them on the temporaries.
5506 for (unsigned I = 0, N = ExprEvalContexts.back().DelayedDecltypeBinds.size();
5508 CXXBindTemporaryExpr *Bind =
5509 ExprEvalContexts.back().DelayedDecltypeBinds[I];
5510 if (Bind == TopBind)
5513 CXXTemporary *Temp = Bind->getTemporary();
5516 Bind->getType()->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
5517 CXXDestructorDecl *Destructor = LookupDestructor(RD);
5518 Temp->setDestructor(Destructor);
5520 MarkFunctionReferenced(Bind->getExprLoc(), Destructor);
5521 CheckDestructorAccess(Bind->getExprLoc(), Destructor,
5522 PDiag(diag::err_access_dtor_temp)
5523 << Bind->getType());
5524 if (DiagnoseUseOfDecl(Destructor, Bind->getExprLoc()))
5527 // We need a cleanup, but we don't need to remember the temporary.
5528 ExprNeedsCleanups = true;
5531 // Possibly strip off the top CXXBindTemporaryExpr.
5535 /// Note a set of 'operator->' functions that were used for a member access.
5536 static void noteOperatorArrows(Sema &S,
5537 ArrayRef<FunctionDecl *> OperatorArrows) {
5538 unsigned SkipStart = OperatorArrows.size(), SkipCount = 0;
5539 // FIXME: Make this configurable?
5541 if (OperatorArrows.size() > Limit) {
5542 // Produce Limit-1 normal notes and one 'skipping' note.
5543 SkipStart = (Limit - 1) / 2 + (Limit - 1) % 2;
5544 SkipCount = OperatorArrows.size() - (Limit - 1);
5547 for (unsigned I = 0; I < OperatorArrows.size(); /**/) {
5548 if (I == SkipStart) {
5549 S.Diag(OperatorArrows[I]->getLocation(),
5550 diag::note_operator_arrows_suppressed)
5554 S.Diag(OperatorArrows[I]->getLocation(), diag::note_operator_arrow_here)
5555 << OperatorArrows[I]->getCallResultType();
5561 ExprResult Sema::ActOnStartCXXMemberReference(Scope *S, Expr *Base,
5562 SourceLocation OpLoc,
5563 tok::TokenKind OpKind,
5564 ParsedType &ObjectType,
5565 bool &MayBePseudoDestructor) {
5566 // Since this might be a postfix expression, get rid of ParenListExprs.
5567 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
5568 if (Result.isInvalid()) return ExprError();
5569 Base = Result.get();
5571 Result = CheckPlaceholderExpr(Base);
5572 if (Result.isInvalid()) return ExprError();
5573 Base = Result.get();
5575 QualType BaseType = Base->getType();
5576 MayBePseudoDestructor = false;
5577 if (BaseType->isDependentType()) {
5578 // If we have a pointer to a dependent type and are using the -> operator,
5579 // the object type is the type that the pointer points to. We might still
5580 // have enough information about that type to do something useful.
5581 if (OpKind == tok::arrow)
5582 if (const PointerType *Ptr = BaseType->getAs<PointerType>())
5583 BaseType = Ptr->getPointeeType();
5585 ObjectType = ParsedType::make(BaseType);
5586 MayBePseudoDestructor = true;
5590 // C++ [over.match.oper]p8:
5591 // [...] When operator->returns, the operator-> is applied to the value
5592 // returned, with the original second operand.
5593 if (OpKind == tok::arrow) {
5594 QualType StartingType = BaseType;
5595 bool NoArrowOperatorFound = false;
5596 bool FirstIteration = true;
5597 FunctionDecl *CurFD = dyn_cast<FunctionDecl>(CurContext);
5598 // The set of types we've considered so far.
5599 llvm::SmallPtrSet<CanQualType,8> CTypes;
5600 SmallVector<FunctionDecl*, 8> OperatorArrows;
5601 CTypes.insert(Context.getCanonicalType(BaseType));
5603 while (BaseType->isRecordType()) {
5604 if (OperatorArrows.size() >= getLangOpts().ArrowDepth) {
5605 Diag(OpLoc, diag::err_operator_arrow_depth_exceeded)
5606 << StartingType << getLangOpts().ArrowDepth << Base->getSourceRange();
5607 noteOperatorArrows(*this, OperatorArrows);
5608 Diag(OpLoc, diag::note_operator_arrow_depth)
5609 << getLangOpts().ArrowDepth;
5613 Result = BuildOverloadedArrowExpr(
5615 // When in a template specialization and on the first loop iteration,
5616 // potentially give the default diagnostic (with the fixit in a
5617 // separate note) instead of having the error reported back to here
5618 // and giving a diagnostic with a fixit attached to the error itself.
5619 (FirstIteration && CurFD && CurFD->isFunctionTemplateSpecialization())
5621 : &NoArrowOperatorFound);
5622 if (Result.isInvalid()) {
5623 if (NoArrowOperatorFound) {
5624 if (FirstIteration) {
5625 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
5626 << BaseType << 1 << Base->getSourceRange()
5627 << FixItHint::CreateReplacement(OpLoc, ".");
5628 OpKind = tok::period;
5631 Diag(OpLoc, diag::err_typecheck_member_reference_arrow)
5632 << BaseType << Base->getSourceRange();
5633 CallExpr *CE = dyn_cast<CallExpr>(Base);
5634 if (Decl *CD = (CE ? CE->getCalleeDecl() : nullptr)) {
5635 Diag(CD->getLocStart(),
5636 diag::note_member_reference_arrow_from_operator_arrow);
5641 Base = Result.get();
5642 if (CXXOperatorCallExpr *OpCall = dyn_cast<CXXOperatorCallExpr>(Base))
5643 OperatorArrows.push_back(OpCall->getDirectCallee());
5644 BaseType = Base->getType();
5645 CanQualType CBaseType = Context.getCanonicalType(BaseType);
5646 if (!CTypes.insert(CBaseType).second) {
5647 Diag(OpLoc, diag::err_operator_arrow_circular) << StartingType;
5648 noteOperatorArrows(*this, OperatorArrows);
5651 FirstIteration = false;
5654 if (OpKind == tok::arrow &&
5655 (BaseType->isPointerType() || BaseType->isObjCObjectPointerType()))
5656 BaseType = BaseType->getPointeeType();
5659 // Objective-C properties allow "." access on Objective-C pointer types,
5660 // so adjust the base type to the object type itself.
5661 if (BaseType->isObjCObjectPointerType())
5662 BaseType = BaseType->getPointeeType();
5664 // C++ [basic.lookup.classref]p2:
5665 // [...] If the type of the object expression is of pointer to scalar
5666 // type, the unqualified-id is looked up in the context of the complete
5667 // postfix-expression.
5669 // This also indicates that we could be parsing a pseudo-destructor-name.
5670 // Note that Objective-C class and object types can be pseudo-destructor
5671 // expressions or normal member (ivar or property) access expressions.
5672 if (BaseType->isObjCObjectOrInterfaceType()) {
5673 MayBePseudoDestructor = true;
5674 } else if (!BaseType->isRecordType()) {
5675 ObjectType = ParsedType();
5676 MayBePseudoDestructor = true;
5680 // The object type must be complete (or dependent), or
5681 // C++11 [expr.prim.general]p3:
5682 // Unlike the object expression in other contexts, *this is not required to
5683 // be of complete type for purposes of class member access (5.2.5) outside
5684 // the member function body.
5685 if (!BaseType->isDependentType() &&
5686 !isThisOutsideMemberFunctionBody(BaseType) &&
5687 RequireCompleteType(OpLoc, BaseType, diag::err_incomplete_member_access))
5690 // C++ [basic.lookup.classref]p2:
5691 // If the id-expression in a class member access (5.2.5) is an
5692 // unqualified-id, and the type of the object expression is of a class
5693 // type C (or of pointer to a class type C), the unqualified-id is looked
5694 // up in the scope of class C. [...]
5695 ObjectType = ParsedType::make(BaseType);
5699 static bool CheckArrow(Sema& S, QualType& ObjectType, Expr *&Base,
5700 tok::TokenKind& OpKind, SourceLocation OpLoc) {
5701 if (Base->hasPlaceholderType()) {
5702 ExprResult result = S.CheckPlaceholderExpr(Base);
5703 if (result.isInvalid()) return true;
5704 Base = result.get();
5706 ObjectType = Base->getType();
5708 // C++ [expr.pseudo]p2:
5709 // The left-hand side of the dot operator shall be of scalar type. The
5710 // left-hand side of the arrow operator shall be of pointer to scalar type.
5711 // This scalar type is the object type.
5712 // Note that this is rather different from the normal handling for the
5714 if (OpKind == tok::arrow) {
5715 if (const PointerType *Ptr = ObjectType->getAs<PointerType>()) {
5716 ObjectType = Ptr->getPointeeType();
5717 } else if (!Base->isTypeDependent()) {
5718 // The user wrote "p->" when she probably meant "p."; fix it.
5719 S.Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
5720 << ObjectType << true
5721 << FixItHint::CreateReplacement(OpLoc, ".");
5722 if (S.isSFINAEContext())
5725 OpKind = tok::period;
5732 ExprResult Sema::BuildPseudoDestructorExpr(Expr *Base,
5733 SourceLocation OpLoc,
5734 tok::TokenKind OpKind,
5735 const CXXScopeSpec &SS,
5736 TypeSourceInfo *ScopeTypeInfo,
5737 SourceLocation CCLoc,
5738 SourceLocation TildeLoc,
5739 PseudoDestructorTypeStorage Destructed) {
5740 TypeSourceInfo *DestructedTypeInfo = Destructed.getTypeSourceInfo();
5742 QualType ObjectType;
5743 if (CheckArrow(*this, ObjectType, Base, OpKind, OpLoc))
5746 if (!ObjectType->isDependentType() && !ObjectType->isScalarType() &&
5747 !ObjectType->isVectorType()) {
5748 if (getLangOpts().MSVCCompat && ObjectType->isVoidType())
5749 Diag(OpLoc, diag::ext_pseudo_dtor_on_void) << Base->getSourceRange();
5751 Diag(OpLoc, diag::err_pseudo_dtor_base_not_scalar)
5752 << ObjectType << Base->getSourceRange();
5757 // C++ [expr.pseudo]p2:
5758 // [...] The cv-unqualified versions of the object type and of the type
5759 // designated by the pseudo-destructor-name shall be the same type.
5760 if (DestructedTypeInfo) {
5761 QualType DestructedType = DestructedTypeInfo->getType();
5762 SourceLocation DestructedTypeStart
5763 = DestructedTypeInfo->getTypeLoc().getLocalSourceRange().getBegin();
5764 if (!DestructedType->isDependentType() && !ObjectType->isDependentType()) {
5765 if (!Context.hasSameUnqualifiedType(DestructedType, ObjectType)) {
5766 Diag(DestructedTypeStart, diag::err_pseudo_dtor_type_mismatch)
5767 << ObjectType << DestructedType << Base->getSourceRange()
5768 << DestructedTypeInfo->getTypeLoc().getLocalSourceRange();
5770 // Recover by setting the destructed type to the object type.
5771 DestructedType = ObjectType;
5772 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(ObjectType,
5773 DestructedTypeStart);
5774 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
5775 } else if (DestructedType.getObjCLifetime() !=
5776 ObjectType.getObjCLifetime()) {
5778 if (DestructedType.getObjCLifetime() == Qualifiers::OCL_None) {
5779 // Okay: just pretend that the user provided the correctly-qualified
5782 Diag(DestructedTypeStart, diag::err_arc_pseudo_dtor_inconstant_quals)
5783 << ObjectType << DestructedType << Base->getSourceRange()
5784 << DestructedTypeInfo->getTypeLoc().getLocalSourceRange();
5787 // Recover by setting the destructed type to the object type.
5788 DestructedType = ObjectType;
5789 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(ObjectType,
5790 DestructedTypeStart);
5791 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
5796 // C++ [expr.pseudo]p2:
5797 // [...] Furthermore, the two type-names in a pseudo-destructor-name of the
5800 // ::[opt] nested-name-specifier[opt] type-name :: ~ type-name
5802 // shall designate the same scalar type.
5803 if (ScopeTypeInfo) {
5804 QualType ScopeType = ScopeTypeInfo->getType();
5805 if (!ScopeType->isDependentType() && !ObjectType->isDependentType() &&
5806 !Context.hasSameUnqualifiedType(ScopeType, ObjectType)) {
5808 Diag(ScopeTypeInfo->getTypeLoc().getLocalSourceRange().getBegin(),
5809 diag::err_pseudo_dtor_type_mismatch)
5810 << ObjectType << ScopeType << Base->getSourceRange()
5811 << ScopeTypeInfo->getTypeLoc().getLocalSourceRange();
5813 ScopeType = QualType();
5814 ScopeTypeInfo = nullptr;
5819 = new (Context) CXXPseudoDestructorExpr(Context, Base,
5820 OpKind == tok::arrow, OpLoc,
5821 SS.getWithLocInContext(Context),
5830 ExprResult Sema::ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
5831 SourceLocation OpLoc,
5832 tok::TokenKind OpKind,
5834 UnqualifiedId &FirstTypeName,
5835 SourceLocation CCLoc,
5836 SourceLocation TildeLoc,
5837 UnqualifiedId &SecondTypeName) {
5838 assert((FirstTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
5839 FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) &&
5840 "Invalid first type name in pseudo-destructor");
5841 assert((SecondTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
5842 SecondTypeName.getKind() == UnqualifiedId::IK_Identifier) &&
5843 "Invalid second type name in pseudo-destructor");
5845 QualType ObjectType;
5846 if (CheckArrow(*this, ObjectType, Base, OpKind, OpLoc))
5849 // Compute the object type that we should use for name lookup purposes. Only
5850 // record types and dependent types matter.
5851 ParsedType ObjectTypePtrForLookup;
5853 if (ObjectType->isRecordType())
5854 ObjectTypePtrForLookup = ParsedType::make(ObjectType);
5855 else if (ObjectType->isDependentType())
5856 ObjectTypePtrForLookup = ParsedType::make(Context.DependentTy);
5859 // Convert the name of the type being destructed (following the ~) into a
5860 // type (with source-location information).
5861 QualType DestructedType;
5862 TypeSourceInfo *DestructedTypeInfo = nullptr;
5863 PseudoDestructorTypeStorage Destructed;
5864 if (SecondTypeName.getKind() == UnqualifiedId::IK_Identifier) {
5865 ParsedType T = getTypeName(*SecondTypeName.Identifier,
5866 SecondTypeName.StartLocation,
5867 S, &SS, true, false, ObjectTypePtrForLookup);
5869 ((SS.isSet() && !computeDeclContext(SS, false)) ||
5870 (!SS.isSet() && ObjectType->isDependentType()))) {
5871 // The name of the type being destroyed is a dependent name, and we
5872 // couldn't find anything useful in scope. Just store the identifier and
5873 // it's location, and we'll perform (qualified) name lookup again at
5874 // template instantiation time.
5875 Destructed = PseudoDestructorTypeStorage(SecondTypeName.Identifier,
5876 SecondTypeName.StartLocation);
5878 Diag(SecondTypeName.StartLocation,
5879 diag::err_pseudo_dtor_destructor_non_type)
5880 << SecondTypeName.Identifier << ObjectType;
5881 if (isSFINAEContext())
5884 // Recover by assuming we had the right type all along.
5885 DestructedType = ObjectType;
5887 DestructedType = GetTypeFromParser(T, &DestructedTypeInfo);
5889 // Resolve the template-id to a type.
5890 TemplateIdAnnotation *TemplateId = SecondTypeName.TemplateId;
5891 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
5892 TemplateId->NumArgs);
5893 TypeResult T = ActOnTemplateIdType(TemplateId->SS,
5894 TemplateId->TemplateKWLoc,
5895 TemplateId->Template,
5896 TemplateId->TemplateNameLoc,
5897 TemplateId->LAngleLoc,
5899 TemplateId->RAngleLoc);
5900 if (T.isInvalid() || !T.get()) {
5901 // Recover by assuming we had the right type all along.
5902 DestructedType = ObjectType;
5904 DestructedType = GetTypeFromParser(T.get(), &DestructedTypeInfo);
5907 // If we've performed some kind of recovery, (re-)build the type source
5909 if (!DestructedType.isNull()) {
5910 if (!DestructedTypeInfo)
5911 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(DestructedType,
5912 SecondTypeName.StartLocation);
5913 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
5916 // Convert the name of the scope type (the type prior to '::') into a type.
5917 TypeSourceInfo *ScopeTypeInfo = nullptr;
5919 if (FirstTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
5920 FirstTypeName.Identifier) {
5921 if (FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) {
5922 ParsedType T = getTypeName(*FirstTypeName.Identifier,
5923 FirstTypeName.StartLocation,
5924 S, &SS, true, false, ObjectTypePtrForLookup);
5926 Diag(FirstTypeName.StartLocation,
5927 diag::err_pseudo_dtor_destructor_non_type)
5928 << FirstTypeName.Identifier << ObjectType;
5930 if (isSFINAEContext())
5933 // Just drop this type. It's unnecessary anyway.
5934 ScopeType = QualType();
5936 ScopeType = GetTypeFromParser(T, &ScopeTypeInfo);
5938 // Resolve the template-id to a type.
5939 TemplateIdAnnotation *TemplateId = FirstTypeName.TemplateId;
5940 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
5941 TemplateId->NumArgs);
5942 TypeResult T = ActOnTemplateIdType(TemplateId->SS,
5943 TemplateId->TemplateKWLoc,
5944 TemplateId->Template,
5945 TemplateId->TemplateNameLoc,
5946 TemplateId->LAngleLoc,
5948 TemplateId->RAngleLoc);
5949 if (T.isInvalid() || !T.get()) {
5950 // Recover by dropping this type.
5951 ScopeType = QualType();
5953 ScopeType = GetTypeFromParser(T.get(), &ScopeTypeInfo);
5957 if (!ScopeType.isNull() && !ScopeTypeInfo)
5958 ScopeTypeInfo = Context.getTrivialTypeSourceInfo(ScopeType,
5959 FirstTypeName.StartLocation);
5962 return BuildPseudoDestructorExpr(Base, OpLoc, OpKind, SS,
5963 ScopeTypeInfo, CCLoc, TildeLoc,
5967 ExprResult Sema::ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
5968 SourceLocation OpLoc,
5969 tok::TokenKind OpKind,
5970 SourceLocation TildeLoc,
5971 const DeclSpec& DS) {
5972 QualType ObjectType;
5973 if (CheckArrow(*this, ObjectType, Base, OpKind, OpLoc))
5976 QualType T = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc(),
5980 DecltypeTypeLoc DecltypeTL = TLB.push<DecltypeTypeLoc>(T);
5981 DecltypeTL.setNameLoc(DS.getTypeSpecTypeLoc());
5982 TypeSourceInfo *DestructedTypeInfo = TLB.getTypeSourceInfo(Context, T);
5983 PseudoDestructorTypeStorage Destructed(DestructedTypeInfo);
5985 return BuildPseudoDestructorExpr(Base, OpLoc, OpKind, CXXScopeSpec(),
5986 nullptr, SourceLocation(), TildeLoc,
5990 ExprResult Sema::BuildCXXMemberCallExpr(Expr *E, NamedDecl *FoundDecl,
5991 CXXConversionDecl *Method,
5992 bool HadMultipleCandidates) {
5993 if (Method->getParent()->isLambda() &&
5994 Method->getConversionType()->isBlockPointerType()) {
5995 // This is a lambda coversion to block pointer; check if the argument
5998 CastExpr *CE = dyn_cast<CastExpr>(SubE);
5999 if (CE && CE->getCastKind() == CK_NoOp)
6000 SubE = CE->getSubExpr();
6001 SubE = SubE->IgnoreParens();
6002 if (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(SubE))
6003 SubE = BE->getSubExpr();
6004 if (isa<LambdaExpr>(SubE)) {
6005 // For the conversion to block pointer on a lambda expression, we
6006 // construct a special BlockLiteral instead; this doesn't really make
6007 // a difference in ARC, but outside of ARC the resulting block literal
6008 // follows the normal lifetime rules for block literals instead of being
6010 DiagnosticErrorTrap Trap(Diags);
6011 ExprResult Exp = BuildBlockForLambdaConversion(E->getExprLoc(),
6014 if (Exp.isInvalid())
6015 Diag(E->getExprLoc(), diag::note_lambda_to_block_conv);
6020 ExprResult Exp = PerformObjectArgumentInitialization(E, /*Qualifier=*/nullptr,
6022 if (Exp.isInvalid())
6025 MemberExpr *ME = new (Context) MemberExpr(
6026 Exp.get(), /*IsArrow=*/false, SourceLocation(), Method, SourceLocation(),
6027 Context.BoundMemberTy, VK_RValue, OK_Ordinary);
6028 if (HadMultipleCandidates)
6029 ME->setHadMultipleCandidates(true);
6030 MarkMemberReferenced(ME);
6032 QualType ResultType = Method->getReturnType();
6033 ExprValueKind VK = Expr::getValueKindForType(ResultType);
6034 ResultType = ResultType.getNonLValueExprType(Context);
6036 CXXMemberCallExpr *CE =
6037 new (Context) CXXMemberCallExpr(Context, ME, None, ResultType, VK,
6038 Exp.get()->getLocEnd());
6042 ExprResult Sema::BuildCXXNoexceptExpr(SourceLocation KeyLoc, Expr *Operand,
6043 SourceLocation RParen) {
6044 // If the operand is an unresolved lookup expression, the expression is ill-
6045 // formed per [over.over]p1, because overloaded function names cannot be used
6046 // without arguments except in explicit contexts.
6047 ExprResult R = CheckPlaceholderExpr(Operand);
6051 // The operand may have been modified when checking the placeholder type.
6054 if (ActiveTemplateInstantiations.empty() &&
6055 Operand->HasSideEffects(Context, false)) {
6056 // The expression operand for noexcept is in an unevaluated expression
6057 // context, so side effects could result in unintended consequences.
6058 Diag(Operand->getExprLoc(), diag::warn_side_effects_unevaluated_context);
6061 CanThrowResult CanThrow = canThrow(Operand);
6062 return new (Context)
6063 CXXNoexceptExpr(Context.BoolTy, Operand, CanThrow, KeyLoc, RParen);
6066 ExprResult Sema::ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation,
6067 Expr *Operand, SourceLocation RParen) {
6068 return BuildCXXNoexceptExpr(KeyLoc, Operand, RParen);
6071 static bool IsSpecialDiscardedValue(Expr *E) {
6072 // In C++11, discarded-value expressions of a certain form are special,
6073 // according to [expr]p10:
6074 // The lvalue-to-rvalue conversion (4.1) is applied only if the
6075 // expression is an lvalue of volatile-qualified type and it has
6076 // one of the following forms:
6077 E = E->IgnoreParens();
6079 // - id-expression (5.1.1),
6080 if (isa<DeclRefExpr>(E))
6083 // - subscripting (5.2.1),
6084 if (isa<ArraySubscriptExpr>(E))
6087 // - class member access (5.2.5),
6088 if (isa<MemberExpr>(E))
6091 // - indirection (5.3.1),
6092 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E))
6093 if (UO->getOpcode() == UO_Deref)
6096 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
6097 // - pointer-to-member operation (5.5),
6098 if (BO->isPtrMemOp())
6101 // - comma expression (5.18) where the right operand is one of the above.
6102 if (BO->getOpcode() == BO_Comma)
6103 return IsSpecialDiscardedValue(BO->getRHS());
6106 // - conditional expression (5.16) where both the second and the third
6107 // operands are one of the above, or
6108 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E))
6109 return IsSpecialDiscardedValue(CO->getTrueExpr()) &&
6110 IsSpecialDiscardedValue(CO->getFalseExpr());
6111 // The related edge case of "*x ?: *x".
6112 if (BinaryConditionalOperator *BCO =
6113 dyn_cast<BinaryConditionalOperator>(E)) {
6114 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(BCO->getTrueExpr()))
6115 return IsSpecialDiscardedValue(OVE->getSourceExpr()) &&
6116 IsSpecialDiscardedValue(BCO->getFalseExpr());
6119 // Objective-C++ extensions to the rule.
6120 if (isa<PseudoObjectExpr>(E) || isa<ObjCIvarRefExpr>(E))
6126 /// Perform the conversions required for an expression used in a
6127 /// context that ignores the result.
6128 ExprResult Sema::IgnoredValueConversions(Expr *E) {
6129 if (E->hasPlaceholderType()) {
6130 ExprResult result = CheckPlaceholderExpr(E);
6131 if (result.isInvalid()) return E;
6136 // [Except in specific positions,] an lvalue that does not have
6137 // array type is converted to the value stored in the
6138 // designated object (and is no longer an lvalue).
6139 if (E->isRValue()) {
6140 // In C, function designators (i.e. expressions of function type)
6141 // are r-values, but we still want to do function-to-pointer decay
6142 // on them. This is both technically correct and convenient for
6144 if (!getLangOpts().CPlusPlus && E->getType()->isFunctionType())
6145 return DefaultFunctionArrayConversion(E);
6150 if (getLangOpts().CPlusPlus) {
6151 // The C++11 standard defines the notion of a discarded-value expression;
6152 // normally, we don't need to do anything to handle it, but if it is a
6153 // volatile lvalue with a special form, we perform an lvalue-to-rvalue
6155 if (getLangOpts().CPlusPlus11 && E->isGLValue() &&
6156 E->getType().isVolatileQualified() &&
6157 IsSpecialDiscardedValue(E)) {
6158 ExprResult Res = DefaultLvalueConversion(E);
6159 if (Res.isInvalid())
6166 // GCC seems to also exclude expressions of incomplete enum type.
6167 if (const EnumType *T = E->getType()->getAs<EnumType>()) {
6168 if (!T->getDecl()->isComplete()) {
6169 // FIXME: stupid workaround for a codegen bug!
6170 E = ImpCastExprToType(E, Context.VoidTy, CK_ToVoid).get();
6175 ExprResult Res = DefaultFunctionArrayLvalueConversion(E);
6176 if (Res.isInvalid())
6180 if (!E->getType()->isVoidType())
6181 RequireCompleteType(E->getExprLoc(), E->getType(),
6182 diag::err_incomplete_type);
6186 // If we can unambiguously determine whether Var can never be used
6187 // in a constant expression, return true.
6188 // - if the variable and its initializer are non-dependent, then
6189 // we can unambiguously check if the variable is a constant expression.
6190 // - if the initializer is not value dependent - we can determine whether
6191 // it can be used to initialize a constant expression. If Init can not
6192 // be used to initialize a constant expression we conclude that Var can
6193 // never be a constant expression.
6194 // - FXIME: if the initializer is dependent, we can still do some analysis and
6195 // identify certain cases unambiguously as non-const by using a Visitor:
6196 // - such as those that involve odr-use of a ParmVarDecl, involve a new
6197 // delete, lambda-expr, dynamic-cast, reinterpret-cast etc...
6198 static inline bool VariableCanNeverBeAConstantExpression(VarDecl *Var,
6199 ASTContext &Context) {
6200 if (isa<ParmVarDecl>(Var)) return true;
6201 const VarDecl *DefVD = nullptr;
6203 // If there is no initializer - this can not be a constant expression.
6204 if (!Var->getAnyInitializer(DefVD)) return true;
6206 if (DefVD->isWeak()) return false;
6207 EvaluatedStmt *Eval = DefVD->ensureEvaluatedStmt();
6209 Expr *Init = cast<Expr>(Eval->Value);
6211 if (Var->getType()->isDependentType() || Init->isValueDependent()) {
6212 // FIXME: Teach the constant evaluator to deal with the non-dependent parts
6213 // of value-dependent expressions, and use it here to determine whether the
6214 // initializer is a potential constant expression.
6218 return !IsVariableAConstantExpression(Var, Context);
6221 /// \brief Check if the current lambda has any potential captures
6222 /// that must be captured by any of its enclosing lambdas that are ready to
6223 /// capture. If there is a lambda that can capture a nested
6224 /// potential-capture, go ahead and do so. Also, check to see if any
6225 /// variables are uncaptureable or do not involve an odr-use so do not
6226 /// need to be captured.
6228 static void CheckIfAnyEnclosingLambdasMustCaptureAnyPotentialCaptures(
6229 Expr *const FE, LambdaScopeInfo *const CurrentLSI, Sema &S) {
6231 assert(!S.isUnevaluatedContext());
6232 assert(S.CurContext->isDependentContext());
6233 assert(CurrentLSI->CallOperator == S.CurContext &&
6234 "The current call operator must be synchronized with Sema's CurContext");
6236 const bool IsFullExprInstantiationDependent = FE->isInstantiationDependent();
6238 ArrayRef<const FunctionScopeInfo *> FunctionScopesArrayRef(
6239 S.FunctionScopes.data(), S.FunctionScopes.size());
6241 // All the potentially captureable variables in the current nested
6242 // lambda (within a generic outer lambda), must be captured by an
6243 // outer lambda that is enclosed within a non-dependent context.
6244 const unsigned NumPotentialCaptures =
6245 CurrentLSI->getNumPotentialVariableCaptures();
6246 for (unsigned I = 0; I != NumPotentialCaptures; ++I) {
6247 Expr *VarExpr = nullptr;
6248 VarDecl *Var = nullptr;
6249 CurrentLSI->getPotentialVariableCapture(I, Var, VarExpr);
6250 // If the variable is clearly identified as non-odr-used and the full
6251 // expression is not instantiation dependent, only then do we not
6252 // need to check enclosing lambda's for speculative captures.
6254 // Even though 'x' is not odr-used, it should be captured.
6256 // const int x = 10;
6257 // auto L = [=](auto a) {
6261 if (CurrentLSI->isVariableExprMarkedAsNonODRUsed(VarExpr) &&
6262 !IsFullExprInstantiationDependent)
6265 // If we have a capture-capable lambda for the variable, go ahead and
6266 // capture the variable in that lambda (and all its enclosing lambdas).
6267 if (const Optional<unsigned> Index =
6268 getStackIndexOfNearestEnclosingCaptureCapableLambda(
6269 FunctionScopesArrayRef, Var, S)) {
6270 const unsigned FunctionScopeIndexOfCapturableLambda = Index.getValue();
6271 MarkVarDeclODRUsed(Var, VarExpr->getExprLoc(), S,
6272 &FunctionScopeIndexOfCapturableLambda);
6274 const bool IsVarNeverAConstantExpression =
6275 VariableCanNeverBeAConstantExpression(Var, S.Context);
6276 if (!IsFullExprInstantiationDependent || IsVarNeverAConstantExpression) {
6277 // This full expression is not instantiation dependent or the variable
6278 // can not be used in a constant expression - which means
6279 // this variable must be odr-used here, so diagnose a
6280 // capture violation early, if the variable is un-captureable.
6281 // This is purely for diagnosing errors early. Otherwise, this
6282 // error would get diagnosed when the lambda becomes capture ready.
6283 QualType CaptureType, DeclRefType;
6284 SourceLocation ExprLoc = VarExpr->getExprLoc();
6285 if (S.tryCaptureVariable(Var, ExprLoc, S.TryCapture_Implicit,
6286 /*EllipsisLoc*/ SourceLocation(),
6287 /*BuildAndDiagnose*/false, CaptureType,
6288 DeclRefType, nullptr)) {
6289 // We will never be able to capture this variable, and we need
6290 // to be able to in any and all instantiations, so diagnose it.
6291 S.tryCaptureVariable(Var, ExprLoc, S.TryCapture_Implicit,
6292 /*EllipsisLoc*/ SourceLocation(),
6293 /*BuildAndDiagnose*/true, CaptureType,
6294 DeclRefType, nullptr);
6299 // Check if 'this' needs to be captured.
6300 if (CurrentLSI->hasPotentialThisCapture()) {
6301 // If we have a capture-capable lambda for 'this', go ahead and capture
6302 // 'this' in that lambda (and all its enclosing lambdas).
6303 if (const Optional<unsigned> Index =
6304 getStackIndexOfNearestEnclosingCaptureCapableLambda(
6305 FunctionScopesArrayRef, /*0 is 'this'*/ nullptr, S)) {
6306 const unsigned FunctionScopeIndexOfCapturableLambda = Index.getValue();
6307 S.CheckCXXThisCapture(CurrentLSI->PotentialThisCaptureLocation,
6308 /*Explicit*/ false, /*BuildAndDiagnose*/ true,
6309 &FunctionScopeIndexOfCapturableLambda);
6313 // Reset all the potential captures at the end of each full-expression.
6314 CurrentLSI->clearPotentialCaptures();
6317 static ExprResult attemptRecovery(Sema &SemaRef,
6318 const TypoCorrectionConsumer &Consumer,
6319 TypoCorrection TC) {
6320 LookupResult R(SemaRef, Consumer.getLookupResult().getLookupNameInfo(),
6321 Consumer.getLookupResult().getLookupKind());
6322 const CXXScopeSpec *SS = Consumer.getSS();
6325 // Use an approprate CXXScopeSpec for building the expr.
6326 if (auto *NNS = TC.getCorrectionSpecifier())
6327 NewSS.MakeTrivial(SemaRef.Context, NNS, TC.getCorrectionRange());
6328 else if (SS && !TC.WillReplaceSpecifier())
6331 if (auto *ND = TC.getCorrectionDecl()) {
6332 R.setLookupName(ND->getDeclName());
6334 if (ND->isCXXClassMember()) {
6335 // Figure out the correct naming class to add to the LookupResult.
6336 CXXRecordDecl *Record = nullptr;
6337 if (auto *NNS = TC.getCorrectionSpecifier())
6338 Record = NNS->getAsType()->getAsCXXRecordDecl();
6341 dyn_cast<CXXRecordDecl>(ND->getDeclContext()->getRedeclContext());
6343 R.setNamingClass(Record);
6345 // Detect and handle the case where the decl might be an implicit
6347 bool MightBeImplicitMember;
6348 if (!Consumer.isAddressOfOperand())
6349 MightBeImplicitMember = true;
6350 else if (!NewSS.isEmpty())
6351 MightBeImplicitMember = false;
6352 else if (R.isOverloadedResult())
6353 MightBeImplicitMember = false;
6354 else if (R.isUnresolvableResult())
6355 MightBeImplicitMember = true;
6357 MightBeImplicitMember = isa<FieldDecl>(ND) ||
6358 isa<IndirectFieldDecl>(ND) ||
6359 isa<MSPropertyDecl>(ND);
6361 if (MightBeImplicitMember)
6362 return SemaRef.BuildPossibleImplicitMemberExpr(
6363 NewSS, /*TemplateKWLoc*/ SourceLocation(), R,
6364 /*TemplateArgs*/ nullptr);
6365 } else if (auto *Ivar = dyn_cast<ObjCIvarDecl>(ND)) {
6366 return SemaRef.LookupInObjCMethod(R, Consumer.getScope(),
6367 Ivar->getIdentifier());
6371 return SemaRef.BuildDeclarationNameExpr(NewSS, R, /*NeedsADL*/ false,
6372 /*AcceptInvalidDecl*/ true);
6376 class FindTypoExprs : public RecursiveASTVisitor<FindTypoExprs> {
6377 llvm::SmallSetVector<TypoExpr *, 2> &TypoExprs;
6380 explicit FindTypoExprs(llvm::SmallSetVector<TypoExpr *, 2> &TypoExprs)
6381 : TypoExprs(TypoExprs) {}
6382 bool VisitTypoExpr(TypoExpr *TE) {
6383 TypoExprs.insert(TE);
6388 class TransformTypos : public TreeTransform<TransformTypos> {
6389 typedef TreeTransform<TransformTypos> BaseTransform;
6391 VarDecl *InitDecl; // A decl to avoid as a correction because it is in the
6392 // process of being initialized.
6393 llvm::function_ref<ExprResult(Expr *)> ExprFilter;
6394 llvm::SmallSetVector<TypoExpr *, 2> TypoExprs, AmbiguousTypoExprs;
6395 llvm::SmallDenseMap<TypoExpr *, ExprResult, 2> TransformCache;
6396 llvm::SmallDenseMap<OverloadExpr *, Expr *, 4> OverloadResolution;
6398 /// \brief Emit diagnostics for all of the TypoExprs encountered.
6399 /// If the TypoExprs were successfully corrected, then the diagnostics should
6400 /// suggest the corrections. Otherwise the diagnostics will not suggest
6401 /// anything (having been passed an empty TypoCorrection).
6402 void EmitAllDiagnostics() {
6403 for (auto E : TypoExprs) {
6404 TypoExpr *TE = cast<TypoExpr>(E);
6405 auto &State = SemaRef.getTypoExprState(TE);
6406 if (State.DiagHandler) {
6407 TypoCorrection TC = State.Consumer->getCurrentCorrection();
6408 ExprResult Replacement = TransformCache[TE];
6410 // Extract the NamedDecl from the transformed TypoExpr and add it to the
6411 // TypoCorrection, replacing the existing decls. This ensures the right
6412 // NamedDecl is used in diagnostics e.g. in the case where overload
6413 // resolution was used to select one from several possible decls that
6414 // had been stored in the TypoCorrection.
6415 if (auto *ND = getDeclFromExpr(
6416 Replacement.isInvalid() ? nullptr : Replacement.get()))
6417 TC.setCorrectionDecl(ND);
6419 State.DiagHandler(TC);
6421 SemaRef.clearDelayedTypo(TE);
6425 /// \brief If corrections for the first TypoExpr have been exhausted for a
6426 /// given combination of the other TypoExprs, retry those corrections against
6427 /// the next combination of substitutions for the other TypoExprs by advancing
6428 /// to the next potential correction of the second TypoExpr. For the second
6429 /// and subsequent TypoExprs, if its stream of corrections has been exhausted,
6430 /// the stream is reset and the next TypoExpr's stream is advanced by one (a
6431 /// TypoExpr's correction stream is advanced by removing the TypoExpr from the
6432 /// TransformCache). Returns true if there is still any untried combinations
6434 bool CheckAndAdvanceTypoExprCorrectionStreams() {
6435 for (auto TE : TypoExprs) {
6436 auto &State = SemaRef.getTypoExprState(TE);
6437 TransformCache.erase(TE);
6438 if (!State.Consumer->finished())
6440 State.Consumer->resetCorrectionStream();
6445 NamedDecl *getDeclFromExpr(Expr *E) {
6446 if (auto *OE = dyn_cast_or_null<OverloadExpr>(E))
6447 E = OverloadResolution[OE];
6451 if (auto *DRE = dyn_cast<DeclRefExpr>(E))
6452 return DRE->getDecl();
6453 if (auto *ME = dyn_cast<MemberExpr>(E))
6454 return ME->getMemberDecl();
6455 // FIXME: Add any other expr types that could be be seen by the delayed typo
6456 // correction TreeTransform for which the corresponding TypoCorrection could
6457 // contain multiple decls.
6461 ExprResult TryTransform(Expr *E) {
6462 Sema::SFINAETrap Trap(SemaRef);
6463 ExprResult Res = TransformExpr(E);
6464 if (Trap.hasErrorOccurred() || Res.isInvalid())
6467 return ExprFilter(Res.get());
6471 TransformTypos(Sema &SemaRef, VarDecl *InitDecl, llvm::function_ref<ExprResult(Expr *)> Filter)
6472 : BaseTransform(SemaRef), InitDecl(InitDecl), ExprFilter(Filter) {}
6474 ExprResult RebuildCallExpr(Expr *Callee, SourceLocation LParenLoc,
6476 SourceLocation RParenLoc,
6477 Expr *ExecConfig = nullptr) {
6478 auto Result = BaseTransform::RebuildCallExpr(Callee, LParenLoc, Args,
6479 RParenLoc, ExecConfig);
6480 if (auto *OE = dyn_cast<OverloadExpr>(Callee)) {
6481 if (Result.isUsable()) {
6482 Expr *ResultCall = Result.get();
6483 if (auto *BE = dyn_cast<CXXBindTemporaryExpr>(ResultCall))
6484 ResultCall = BE->getSubExpr();
6485 if (auto *CE = dyn_cast<CallExpr>(ResultCall))
6486 OverloadResolution[OE] = CE->getCallee();
6492 ExprResult TransformLambdaExpr(LambdaExpr *E) { return Owned(E); }
6494 ExprResult Transform(Expr *E) {
6497 Res = TryTransform(E);
6499 // Exit if either the transform was valid or if there were no TypoExprs
6500 // to transform that still have any untried correction candidates..
6501 if (!Res.isInvalid() ||
6502 !CheckAndAdvanceTypoExprCorrectionStreams())
6506 // Ensure none of the TypoExprs have multiple typo correction candidates
6507 // with the same edit length that pass all the checks and filters.
6508 // TODO: Properly handle various permutations of possible corrections when
6509 // there is more than one potentially ambiguous typo correction.
6510 while (!AmbiguousTypoExprs.empty()) {
6511 auto TE = AmbiguousTypoExprs.back();
6512 auto Cached = TransformCache[TE];
6513 auto &State = SemaRef.getTypoExprState(TE);
6514 State.Consumer->saveCurrentPosition();
6515 TransformCache.erase(TE);
6516 if (!TryTransform(E).isInvalid()) {
6517 State.Consumer->resetCorrectionStream();
6518 TransformCache.erase(TE);
6522 AmbiguousTypoExprs.remove(TE);
6523 State.Consumer->restoreSavedPosition();
6524 TransformCache[TE] = Cached;
6527 // Ensure that all of the TypoExprs within the current Expr have been found.
6528 if (!Res.isUsable())
6529 FindTypoExprs(TypoExprs).TraverseStmt(E);
6531 EmitAllDiagnostics();
6536 ExprResult TransformTypoExpr(TypoExpr *E) {
6537 // If the TypoExpr hasn't been seen before, record it. Otherwise, return the
6538 // cached transformation result if there is one and the TypoExpr isn't the
6539 // first one that was encountered.
6540 auto &CacheEntry = TransformCache[E];
6541 if (!TypoExprs.insert(E) && !CacheEntry.isUnset()) {
6545 auto &State = SemaRef.getTypoExprState(E);
6546 assert(State.Consumer && "Cannot transform a cleared TypoExpr");
6548 // For the first TypoExpr and an uncached TypoExpr, find the next likely
6549 // typo correction and return it.
6550 while (TypoCorrection TC = State.Consumer->getNextCorrection()) {
6551 if (InitDecl && TC.getCorrectionDecl() == InitDecl)
6553 ExprResult NE = State.RecoveryHandler ?
6554 State.RecoveryHandler(SemaRef, E, TC) :
6555 attemptRecovery(SemaRef, *State.Consumer, TC);
6556 if (!NE.isInvalid()) {
6557 // Check whether there may be a second viable correction with the same
6558 // edit distance; if so, remember this TypoExpr may have an ambiguous
6559 // correction so it can be more thoroughly vetted later.
6560 TypoCorrection Next;
6561 if ((Next = State.Consumer->peekNextCorrection()) &&
6562 Next.getEditDistance(false) == TC.getEditDistance(false)) {
6563 AmbiguousTypoExprs.insert(E);
6565 AmbiguousTypoExprs.remove(E);
6567 assert(!NE.isUnset() &&
6568 "Typo was transformed into a valid-but-null ExprResult");
6569 return CacheEntry = NE;
6572 return CacheEntry = ExprError();
6578 Sema::CorrectDelayedTyposInExpr(Expr *E, VarDecl *InitDecl,
6579 llvm::function_ref<ExprResult(Expr *)> Filter) {
6580 // If the current evaluation context indicates there are uncorrected typos
6581 // and the current expression isn't guaranteed to not have typos, try to
6582 // resolve any TypoExpr nodes that might be in the expression.
6583 if (E && !ExprEvalContexts.empty() && ExprEvalContexts.back().NumTypos &&
6584 (E->isTypeDependent() || E->isValueDependent() ||
6585 E->isInstantiationDependent())) {
6586 auto TyposInContext = ExprEvalContexts.back().NumTypos;
6587 assert(TyposInContext < ~0U && "Recursive call of CorrectDelayedTyposInExpr");
6588 ExprEvalContexts.back().NumTypos = ~0U;
6589 auto TyposResolved = DelayedTypos.size();
6590 auto Result = TransformTypos(*this, InitDecl, Filter).Transform(E);
6591 ExprEvalContexts.back().NumTypos = TyposInContext;
6592 TyposResolved -= DelayedTypos.size();
6593 if (Result.isInvalid() || Result.get() != E) {
6594 ExprEvalContexts.back().NumTypos -= TyposResolved;
6597 assert(TyposResolved == 0 && "Corrected typo but got same Expr back?");
6602 ExprResult Sema::ActOnFinishFullExpr(Expr *FE, SourceLocation CC,
6603 bool DiscardedValue,
6605 bool IsLambdaInitCaptureInitializer) {
6606 ExprResult FullExpr = FE;
6608 if (!FullExpr.get())
6611 // If we are an init-expression in a lambdas init-capture, we should not
6612 // diagnose an unexpanded pack now (will be diagnosed once lambda-expr
6613 // containing full-expression is done).
6614 // template<class ... Ts> void test(Ts ... t) {
6615 // test([&a(t)]() { <-- (t) is an init-expr that shouldn't be diagnosed now.
6619 // FIXME: This is a hack. It would be better if we pushed the lambda scope
6620 // when we parse the lambda introducer, and teach capturing (but not
6621 // unexpanded pack detection) to walk over LambdaScopeInfos which don't have a
6622 // corresponding class yet (that is, have LambdaScopeInfo either represent a
6623 // lambda where we've entered the introducer but not the body, or represent a
6624 // lambda where we've entered the body, depending on where the
6625 // parser/instantiation has got to).
6626 if (!IsLambdaInitCaptureInitializer &&
6627 DiagnoseUnexpandedParameterPack(FullExpr.get()))
6630 // Top-level expressions default to 'id' when we're in a debugger.
6631 if (DiscardedValue && getLangOpts().DebuggerCastResultToId &&
6632 FullExpr.get()->getType() == Context.UnknownAnyTy) {
6633 FullExpr = forceUnknownAnyToType(FullExpr.get(), Context.getObjCIdType());
6634 if (FullExpr.isInvalid())
6638 if (DiscardedValue) {
6639 FullExpr = CheckPlaceholderExpr(FullExpr.get());
6640 if (FullExpr.isInvalid())
6643 FullExpr = IgnoredValueConversions(FullExpr.get());
6644 if (FullExpr.isInvalid())
6648 FullExpr = CorrectDelayedTyposInExpr(FullExpr.get());
6649 if (FullExpr.isInvalid())
6652 CheckCompletedExpr(FullExpr.get(), CC, IsConstexpr);
6654 // At the end of this full expression (which could be a deeply nested
6655 // lambda), if there is a potential capture within the nested lambda,
6656 // have the outer capture-able lambda try and capture it.
6657 // Consider the following code:
6658 // void f(int, int);
6659 // void f(const int&, double);
6661 // const int x = 10, y = 20;
6662 // auto L = [=](auto a) {
6663 // auto M = [=](auto b) {
6664 // f(x, b); <-- requires x to be captured by L and M
6665 // f(y, a); <-- requires y to be captured by L, but not all Ms
6670 // FIXME: Also consider what happens for something like this that involves
6671 // the gnu-extension statement-expressions or even lambda-init-captures:
6674 // auto L = [&](auto a) {
6675 // +n + ({ 0; a; });
6679 // Here, we see +n, and then the full-expression 0; ends, so we don't
6680 // capture n (and instead remove it from our list of potential captures),
6681 // and then the full-expression +n + ({ 0; }); ends, but it's too late
6682 // for us to see that we need to capture n after all.
6684 LambdaScopeInfo *const CurrentLSI = getCurLambda();
6685 // FIXME: PR 17877 showed that getCurLambda() can return a valid pointer
6686 // even if CurContext is not a lambda call operator. Refer to that Bug Report
6687 // for an example of the code that might cause this asynchrony.
6688 // By ensuring we are in the context of a lambda's call operator
6689 // we can fix the bug (we only need to check whether we need to capture
6690 // if we are within a lambda's body); but per the comments in that
6691 // PR, a proper fix would entail :
6692 // "Alternative suggestion:
6693 // - Add to Sema an integer holding the smallest (outermost) scope
6694 // index that we are *lexically* within, and save/restore/set to
6695 // FunctionScopes.size() in InstantiatingTemplate's
6696 // constructor/destructor.
6697 // - Teach the handful of places that iterate over FunctionScopes to
6698 // stop at the outermost enclosing lexical scope."
6699 const bool IsInLambdaDeclContext = isLambdaCallOperator(CurContext);
6700 if (IsInLambdaDeclContext && CurrentLSI &&
6701 CurrentLSI->hasPotentialCaptures() && !FullExpr.isInvalid())
6702 CheckIfAnyEnclosingLambdasMustCaptureAnyPotentialCaptures(FE, CurrentLSI,
6704 return MaybeCreateExprWithCleanups(FullExpr);
6707 StmtResult Sema::ActOnFinishFullStmt(Stmt *FullStmt) {
6708 if (!FullStmt) return StmtError();
6710 return MaybeCreateStmtWithCleanups(FullStmt);
6713 Sema::IfExistsResult
6714 Sema::CheckMicrosoftIfExistsSymbol(Scope *S,
6716 const DeclarationNameInfo &TargetNameInfo) {
6717 DeclarationName TargetName = TargetNameInfo.getName();
6719 return IER_DoesNotExist;
6721 // If the name itself is dependent, then the result is dependent.
6722 if (TargetName.isDependentName())
6723 return IER_Dependent;
6725 // Do the redeclaration lookup in the current scope.
6726 LookupResult R(*this, TargetNameInfo, Sema::LookupAnyName,
6727 Sema::NotForRedeclaration);
6728 LookupParsedName(R, S, &SS);
6729 R.suppressDiagnostics();
6731 switch (R.getResultKind()) {
6732 case LookupResult::Found:
6733 case LookupResult::FoundOverloaded:
6734 case LookupResult::FoundUnresolvedValue:
6735 case LookupResult::Ambiguous:
6738 case LookupResult::NotFound:
6739 return IER_DoesNotExist;
6741 case LookupResult::NotFoundInCurrentInstantiation:
6742 return IER_Dependent;
6745 llvm_unreachable("Invalid LookupResult Kind!");
6748 Sema::IfExistsResult
6749 Sema::CheckMicrosoftIfExistsSymbol(Scope *S, SourceLocation KeywordLoc,
6750 bool IsIfExists, CXXScopeSpec &SS,
6751 UnqualifiedId &Name) {
6752 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name);
6754 // Check for unexpanded parameter packs.
6755 SmallVector<UnexpandedParameterPack, 4> Unexpanded;
6756 collectUnexpandedParameterPacks(SS, Unexpanded);
6757 collectUnexpandedParameterPacks(TargetNameInfo, Unexpanded);
6758 if (!Unexpanded.empty()) {
6759 DiagnoseUnexpandedParameterPacks(KeywordLoc,
6760 IsIfExists? UPPC_IfExists
6766 return CheckMicrosoftIfExistsSymbol(S, SS, TargetNameInfo);