1 //===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements semantic analysis for C++ declarations.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Sema/SemaInternal.h"
15 #include "clang/AST/ASTConsumer.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/ASTLambda.h"
18 #include "clang/AST/ASTMutationListener.h"
19 #include "clang/AST/CXXInheritance.h"
20 #include "clang/AST/CharUnits.h"
21 #include "clang/AST/DeclVisitor.h"
22 #include "clang/AST/EvaluatedExprVisitor.h"
23 #include "clang/AST/ExprCXX.h"
24 #include "clang/AST/RecordLayout.h"
25 #include "clang/AST/RecursiveASTVisitor.h"
26 #include "clang/AST/StmtVisitor.h"
27 #include "clang/AST/TypeLoc.h"
28 #include "clang/AST/TypeOrdering.h"
29 #include "clang/Basic/PartialDiagnostic.h"
30 #include "clang/Basic/TargetInfo.h"
31 #include "clang/Lex/LiteralSupport.h"
32 #include "clang/Lex/Preprocessor.h"
33 #include "clang/Sema/CXXFieldCollector.h"
34 #include "clang/Sema/DeclSpec.h"
35 #include "clang/Sema/Initialization.h"
36 #include "clang/Sema/Lookup.h"
37 #include "clang/Sema/ParsedTemplate.h"
38 #include "clang/Sema/Scope.h"
39 #include "clang/Sema/ScopeInfo.h"
40 #include "llvm/ADT/STLExtras.h"
41 #include "llvm/ADT/SmallString.h"
45 using namespace clang;
47 //===----------------------------------------------------------------------===//
48 // CheckDefaultArgumentVisitor
49 //===----------------------------------------------------------------------===//
52 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses
53 /// the default argument of a parameter to determine whether it
54 /// contains any ill-formed subexpressions. For example, this will
55 /// diagnose the use of local variables or parameters within the
56 /// default argument expression.
57 class CheckDefaultArgumentVisitor
58 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> {
63 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
64 : DefaultArg(defarg), S(s) {}
66 bool VisitExpr(Expr *Node);
67 bool VisitDeclRefExpr(DeclRefExpr *DRE);
68 bool VisitCXXThisExpr(CXXThisExpr *ThisE);
69 bool VisitLambdaExpr(LambdaExpr *Lambda);
70 bool VisitPseudoObjectExpr(PseudoObjectExpr *POE);
73 /// VisitExpr - Visit all of the children of this expression.
74 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) {
75 bool IsInvalid = false;
76 for (Stmt::child_range I = Node->children(); I; ++I)
77 IsInvalid |= Visit(*I);
81 /// VisitDeclRefExpr - Visit a reference to a declaration, to
82 /// determine whether this declaration can be used in the default
83 /// argument expression.
84 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) {
85 NamedDecl *Decl = DRE->getDecl();
86 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) {
87 // C++ [dcl.fct.default]p9
88 // Default arguments are evaluated each time the function is
89 // called. The order of evaluation of function arguments is
90 // unspecified. Consequently, parameters of a function shall not
91 // be used in default argument expressions, even if they are not
92 // evaluated. Parameters of a function declared before a default
93 // argument expression are in scope and can hide namespace and
94 // class member names.
95 return S->Diag(DRE->getLocStart(),
96 diag::err_param_default_argument_references_param)
97 << Param->getDeclName() << DefaultArg->getSourceRange();
98 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) {
99 // C++ [dcl.fct.default]p7
100 // Local variables shall not be used in default argument
102 if (VDecl->isLocalVarDecl())
103 return S->Diag(DRE->getLocStart(),
104 diag::err_param_default_argument_references_local)
105 << VDecl->getDeclName() << DefaultArg->getSourceRange();
111 /// VisitCXXThisExpr - Visit a C++ "this" expression.
112 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) {
113 // C++ [dcl.fct.default]p8:
114 // The keyword this shall not be used in a default argument of a
116 return S->Diag(ThisE->getLocStart(),
117 diag::err_param_default_argument_references_this)
118 << ThisE->getSourceRange();
121 bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr(PseudoObjectExpr *POE) {
122 bool Invalid = false;
123 for (PseudoObjectExpr::semantics_iterator
124 i = POE->semantics_begin(), e = POE->semantics_end(); i != e; ++i) {
127 // Look through bindings.
128 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) {
129 E = OVE->getSourceExpr();
130 assert(E && "pseudo-object binding without source expression?");
138 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) {
139 // C++11 [expr.lambda.prim]p13:
140 // A lambda-expression appearing in a default argument shall not
141 // implicitly or explicitly capture any entity.
142 if (Lambda->capture_begin() == Lambda->capture_end())
145 return S->Diag(Lambda->getLocStart(),
146 diag::err_lambda_capture_default_arg);
151 Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc,
152 const CXXMethodDecl *Method) {
153 // If we have an MSAny spec already, don't bother.
154 if (!Method || ComputedEST == EST_MSAny)
157 const FunctionProtoType *Proto
158 = Method->getType()->getAs<FunctionProtoType>();
159 Proto = Self->ResolveExceptionSpec(CallLoc, Proto);
163 ExceptionSpecificationType EST = Proto->getExceptionSpecType();
165 // If this function can throw any exceptions, make a note of that.
166 if (EST == EST_MSAny || EST == EST_None) {
172 // FIXME: If the call to this decl is using any of its default arguments, we
173 // need to search them for potentially-throwing calls.
175 // If this function has a basic noexcept, it doesn't affect the outcome.
176 if (EST == EST_BasicNoexcept)
179 // If we have a throw-all spec at this point, ignore the function.
180 if (ComputedEST == EST_None)
183 // If we're still at noexcept(true) and there's a nothrow() callee,
184 // change to that specification.
185 if (EST == EST_DynamicNone) {
186 if (ComputedEST == EST_BasicNoexcept)
187 ComputedEST = EST_DynamicNone;
191 // Check out noexcept specs.
192 if (EST == EST_ComputedNoexcept) {
193 FunctionProtoType::NoexceptResult NR =
194 Proto->getNoexceptSpec(Self->Context);
195 assert(NR != FunctionProtoType::NR_NoNoexcept &&
196 "Must have noexcept result for EST_ComputedNoexcept.");
197 assert(NR != FunctionProtoType::NR_Dependent &&
198 "Should not generate implicit declarations for dependent cases, "
199 "and don't know how to handle them anyway.");
201 // noexcept(false) -> no spec on the new function
202 if (NR == FunctionProtoType::NR_Throw) {
204 ComputedEST = EST_None;
206 // noexcept(true) won't change anything either.
210 assert(EST == EST_Dynamic && "EST case not considered earlier.");
211 assert(ComputedEST != EST_None &&
212 "Shouldn't collect exceptions when throw-all is guaranteed.");
213 ComputedEST = EST_Dynamic;
214 // Record the exceptions in this function's exception specification.
215 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(),
216 EEnd = Proto->exception_end();
218 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E)))
219 Exceptions.push_back(*E);
222 void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) {
223 if (!E || ComputedEST == EST_MSAny)
228 // C++0x [except.spec]p14:
229 // [An] implicit exception-specification specifies the type-id T if and
230 // only if T is allowed by the exception-specification of a function directly
231 // invoked by f's implicit definition; f shall allow all exceptions if any
232 // function it directly invokes allows all exceptions, and f shall allow no
233 // exceptions if every function it directly invokes allows no exceptions.
235 // Note in particular that if an implicit exception-specification is generated
236 // for a function containing a throw-expression, that specification can still
237 // be noexcept(true).
239 // Note also that 'directly invoked' is not defined in the standard, and there
240 // is no indication that we should only consider potentially-evaluated calls.
242 // Ultimately we should implement the intent of the standard: the exception
243 // specification should be the set of exceptions which can be thrown by the
244 // implicit definition. For now, we assume that any non-nothrow expression can
245 // throw any exception.
247 if (Self->canThrow(E))
248 ComputedEST = EST_None;
252 Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg,
253 SourceLocation EqualLoc) {
254 if (RequireCompleteType(Param->getLocation(), Param->getType(),
255 diag::err_typecheck_decl_incomplete_type)) {
256 Param->setInvalidDecl();
260 // C++ [dcl.fct.default]p5
261 // A default argument expression is implicitly converted (clause
262 // 4) to the parameter type. The default argument expression has
263 // the same semantic constraints as the initializer expression in
264 // a declaration of a variable of the parameter type, using the
265 // copy-initialization semantics (8.5).
266 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
268 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(),
270 InitializationSequence InitSeq(*this, Entity, Kind, Arg);
271 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg);
272 if (Result.isInvalid())
274 Arg = Result.takeAs<Expr>();
276 CheckCompletedExpr(Arg, EqualLoc);
277 Arg = MaybeCreateExprWithCleanups(Arg);
279 // Okay: add the default argument to the parameter
280 Param->setDefaultArg(Arg);
282 // We have already instantiated this parameter; provide each of the
283 // instantiations with the uninstantiated default argument.
284 UnparsedDefaultArgInstantiationsMap::iterator InstPos
285 = UnparsedDefaultArgInstantiations.find(Param);
286 if (InstPos != UnparsedDefaultArgInstantiations.end()) {
287 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I)
288 InstPos->second[I]->setUninstantiatedDefaultArg(Arg);
290 // We're done tracking this parameter's instantiations.
291 UnparsedDefaultArgInstantiations.erase(InstPos);
297 /// ActOnParamDefaultArgument - Check whether the default argument
298 /// provided for a function parameter is well-formed. If so, attach it
299 /// to the parameter declaration.
301 Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc,
303 if (!param || !DefaultArg)
306 ParmVarDecl *Param = cast<ParmVarDecl>(param);
307 UnparsedDefaultArgLocs.erase(Param);
309 // Default arguments are only permitted in C++
310 if (!getLangOpts().CPlusPlus) {
311 Diag(EqualLoc, diag::err_param_default_argument)
312 << DefaultArg->getSourceRange();
313 Param->setInvalidDecl();
317 // Check for unexpanded parameter packs.
318 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) {
319 Param->setInvalidDecl();
323 // Check that the default argument is well-formed
324 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this);
325 if (DefaultArgChecker.Visit(DefaultArg)) {
326 Param->setInvalidDecl();
330 SetParamDefaultArgument(Param, DefaultArg, EqualLoc);
333 /// ActOnParamUnparsedDefaultArgument - We've seen a default
334 /// argument for a function parameter, but we can't parse it yet
335 /// because we're inside a class definition. Note that this default
336 /// argument will be parsed later.
337 void Sema::ActOnParamUnparsedDefaultArgument(Decl *param,
338 SourceLocation EqualLoc,
339 SourceLocation ArgLoc) {
343 ParmVarDecl *Param = cast<ParmVarDecl>(param);
344 Param->setUnparsedDefaultArg();
345 UnparsedDefaultArgLocs[Param] = ArgLoc;
348 /// ActOnParamDefaultArgumentError - Parsing or semantic analysis of
349 /// the default argument for the parameter param failed.
350 void Sema::ActOnParamDefaultArgumentError(Decl *param) {
354 ParmVarDecl *Param = cast<ParmVarDecl>(param);
355 Param->setInvalidDecl();
356 UnparsedDefaultArgLocs.erase(Param);
359 /// CheckExtraCXXDefaultArguments - Check for any extra default
360 /// arguments in the declarator, which is not a function declaration
361 /// or definition and therefore is not permitted to have default
362 /// arguments. This routine should be invoked for every declarator
363 /// that is not a function declaration or definition.
364 void Sema::CheckExtraCXXDefaultArguments(Declarator &D) {
365 // C++ [dcl.fct.default]p3
366 // A default argument expression shall be specified only in the
367 // parameter-declaration-clause of a function declaration or in a
368 // template-parameter (14.1). It shall not be specified for a
369 // parameter pack. If it is specified in a
370 // parameter-declaration-clause, it shall not occur within a
371 // declarator or abstract-declarator of a parameter-declaration.
372 bool MightBeFunction = D.isFunctionDeclarationContext();
373 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
374 DeclaratorChunk &chunk = D.getTypeObject(i);
375 if (chunk.Kind == DeclaratorChunk::Function) {
376 if (MightBeFunction) {
377 // This is a function declaration. It can have default arguments, but
378 // keep looking in case its return type is a function type with default
380 MightBeFunction = false;
383 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) {
385 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param);
386 if (Param->hasUnparsedDefaultArg()) {
387 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens;
388 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
389 << SourceRange((*Toks)[1].getLocation(),
390 Toks->back().getLocation());
392 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0;
393 } else if (Param->getDefaultArg()) {
394 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
395 << Param->getDefaultArg()->getSourceRange();
396 Param->setDefaultArg(0);
399 } else if (chunk.Kind != DeclaratorChunk::Paren) {
400 MightBeFunction = false;
405 static bool functionDeclHasDefaultArgument(const FunctionDecl *FD) {
406 for (unsigned NumParams = FD->getNumParams(); NumParams > 0; --NumParams) {
407 const ParmVarDecl *PVD = FD->getParamDecl(NumParams-1);
408 if (!PVD->hasDefaultArg())
410 if (!PVD->hasInheritedDefaultArg())
416 /// MergeCXXFunctionDecl - Merge two declarations of the same C++
417 /// function, once we already know that they have the same
418 /// type. Subroutine of MergeFunctionDecl. Returns true if there was an
419 /// error, false otherwise.
420 bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old,
422 bool Invalid = false;
424 // C++ [dcl.fct.default]p4:
425 // For non-template functions, default arguments can be added in
426 // later declarations of a function in the same
427 // scope. Declarations in different scopes have completely
428 // distinct sets of default arguments. That is, declarations in
429 // inner scopes do not acquire default arguments from
430 // declarations in outer scopes, and vice versa. In a given
431 // function declaration, all parameters subsequent to a
432 // parameter with a default argument shall have default
433 // arguments supplied in this or previous declarations. A
434 // default argument shall not be redefined by a later
435 // declaration (not even to the same value).
437 // C++ [dcl.fct.default]p6:
438 // Except for member functions of class templates, the default arguments
439 // in a member function definition that appears outside of the class
440 // definition are added to the set of default arguments provided by the
441 // member function declaration in the class definition.
442 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) {
443 ParmVarDecl *OldParam = Old->getParamDecl(p);
444 ParmVarDecl *NewParam = New->getParamDecl(p);
446 bool OldParamHasDfl = OldParam->hasDefaultArg();
447 bool NewParamHasDfl = NewParam->hasDefaultArg();
451 // The declaration context corresponding to the scope is the semantic
452 // parent, unless this is a local function declaration, in which case
453 // it is that surrounding function.
454 DeclContext *ScopeDC = New->getLexicalDeclContext();
455 if (!ScopeDC->isFunctionOrMethod())
456 ScopeDC = New->getDeclContext();
457 if (S && !isDeclInScope(ND, ScopeDC, S) &&
458 !New->getDeclContext()->isRecord())
459 // Ignore default parameters of old decl if they are not in
460 // the same scope and this is not an out-of-line definition of
461 // a member function.
462 OldParamHasDfl = false;
464 if (OldParamHasDfl && NewParamHasDfl) {
466 unsigned DiagDefaultParamID =
467 diag::err_param_default_argument_redefinition;
469 // MSVC accepts that default parameters be redefined for member functions
470 // of template class. The new default parameter's value is ignored.
472 if (getLangOpts().MicrosoftExt) {
473 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New);
474 if (MD && MD->getParent()->getDescribedClassTemplate()) {
475 // Merge the old default argument into the new parameter.
476 NewParam->setHasInheritedDefaultArg();
477 if (OldParam->hasUninstantiatedDefaultArg())
478 NewParam->setUninstantiatedDefaultArg(
479 OldParam->getUninstantiatedDefaultArg());
481 NewParam->setDefaultArg(OldParam->getInit());
482 DiagDefaultParamID = diag::warn_param_default_argument_redefinition;
487 // FIXME: If we knew where the '=' was, we could easily provide a fix-it
488 // hint here. Alternatively, we could walk the type-source information
489 // for NewParam to find the last source location in the type... but it
490 // isn't worth the effort right now. This is the kind of test case that
491 // is hard to get right:
493 // void g(int (*fp)(int) = f);
494 // void g(int (*fp)(int) = &f);
495 Diag(NewParam->getLocation(), DiagDefaultParamID)
496 << NewParam->getDefaultArgRange();
498 // Look for the function declaration where the default argument was
499 // actually written, which may be a declaration prior to Old.
500 for (FunctionDecl *Older = Old->getPreviousDecl();
501 Older; Older = Older->getPreviousDecl()) {
502 if (!Older->getParamDecl(p)->hasDefaultArg())
505 OldParam = Older->getParamDecl(p);
508 Diag(OldParam->getLocation(), diag::note_previous_definition)
509 << OldParam->getDefaultArgRange();
510 } else if (OldParamHasDfl) {
511 // Merge the old default argument into the new parameter.
512 // It's important to use getInit() here; getDefaultArg()
513 // strips off any top-level ExprWithCleanups.
514 NewParam->setHasInheritedDefaultArg();
515 if (OldParam->hasUninstantiatedDefaultArg())
516 NewParam->setUninstantiatedDefaultArg(
517 OldParam->getUninstantiatedDefaultArg());
519 NewParam->setDefaultArg(OldParam->getInit());
520 } else if (NewParamHasDfl) {
521 if (New->getDescribedFunctionTemplate()) {
522 // Paragraph 4, quoted above, only applies to non-template functions.
523 Diag(NewParam->getLocation(),
524 diag::err_param_default_argument_template_redecl)
525 << NewParam->getDefaultArgRange();
526 Diag(Old->getLocation(), diag::note_template_prev_declaration)
528 } else if (New->getTemplateSpecializationKind()
529 != TSK_ImplicitInstantiation &&
530 New->getTemplateSpecializationKind() != TSK_Undeclared) {
531 // C++ [temp.expr.spec]p21:
532 // Default function arguments shall not be specified in a declaration
533 // or a definition for one of the following explicit specializations:
534 // - the explicit specialization of a function template;
535 // - the explicit specialization of a member function template;
536 // - the explicit specialization of a member function of a class
537 // template where the class template specialization to which the
538 // member function specialization belongs is implicitly
540 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg)
541 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization)
542 << New->getDeclName()
543 << NewParam->getDefaultArgRange();
544 } else if (New->getDeclContext()->isDependentContext()) {
545 // C++ [dcl.fct.default]p6 (DR217):
546 // Default arguments for a member function of a class template shall
547 // be specified on the initial declaration of the member function
548 // within the class template.
550 // Reading the tea leaves a bit in DR217 and its reference to DR205
551 // leads me to the conclusion that one cannot add default function
552 // arguments for an out-of-line definition of a member function of a
555 if (CXXRecordDecl *Record
556 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) {
557 if (Record->getDescribedClassTemplate())
559 else if (isa<ClassTemplatePartialSpecializationDecl>(Record))
565 Diag(NewParam->getLocation(),
566 diag::err_param_default_argument_member_template_redecl)
568 << NewParam->getDefaultArgRange();
573 // DR1344: If a default argument is added outside a class definition and that
574 // default argument makes the function a special member function, the program
575 // is ill-formed. This can only happen for constructors.
576 if (isa<CXXConstructorDecl>(New) &&
577 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) {
578 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)),
579 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old));
580 if (NewSM != OldSM) {
581 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments());
582 assert(NewParam->hasDefaultArg());
583 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special)
584 << NewParam->getDefaultArgRange() << NewSM;
585 Diag(Old->getLocation(), diag::note_previous_declaration);
589 // C++11 [dcl.constexpr]p1: If any declaration of a function or function
590 // template has a constexpr specifier then all its declarations shall
591 // contain the constexpr specifier.
592 if (New->isConstexpr() != Old->isConstexpr()) {
593 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch)
594 << New << New->isConstexpr();
595 Diag(Old->getLocation(), diag::note_previous_declaration);
599 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a default
600 // argument expression, that declaration shall be a definition and shall be
601 // the only declaration of the function or function template in the
603 if (Old->getFriendObjectKind() == Decl::FOK_Undeclared &&
604 functionDeclHasDefaultArgument(Old)) {
605 Diag(New->getLocation(), diag::err_friend_decl_with_def_arg_redeclared);
606 Diag(Old->getLocation(), diag::note_previous_declaration);
610 if (CheckEquivalentExceptionSpec(Old, New))
616 /// \brief Merge the exception specifications of two variable declarations.
618 /// This is called when there's a redeclaration of a VarDecl. The function
619 /// checks if the redeclaration might have an exception specification and
620 /// validates compatibility and merges the specs if necessary.
621 void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) {
622 // Shortcut if exceptions are disabled.
623 if (!getLangOpts().CXXExceptions)
626 assert(Context.hasSameType(New->getType(), Old->getType()) &&
627 "Should only be called if types are otherwise the same.");
629 QualType NewType = New->getType();
630 QualType OldType = Old->getType();
632 // We're only interested in pointers and references to functions, as well
633 // as pointers to member functions.
634 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) {
635 NewType = R->getPointeeType();
636 OldType = OldType->getAs<ReferenceType>()->getPointeeType();
637 } else if (const PointerType *P = NewType->getAs<PointerType>()) {
638 NewType = P->getPointeeType();
639 OldType = OldType->getAs<PointerType>()->getPointeeType();
640 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) {
641 NewType = M->getPointeeType();
642 OldType = OldType->getAs<MemberPointerType>()->getPointeeType();
645 if (!NewType->isFunctionProtoType())
648 // There's lots of special cases for functions. For function pointers, system
649 // libraries are hopefully not as broken so that we don't need these
651 if (CheckEquivalentExceptionSpec(
652 OldType->getAs<FunctionProtoType>(), Old->getLocation(),
653 NewType->getAs<FunctionProtoType>(), New->getLocation())) {
654 New->setInvalidDecl();
658 /// CheckCXXDefaultArguments - Verify that the default arguments for a
659 /// function declaration are well-formed according to C++
660 /// [dcl.fct.default].
661 void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) {
662 unsigned NumParams = FD->getNumParams();
665 // Find first parameter with a default argument
666 for (p = 0; p < NumParams; ++p) {
667 ParmVarDecl *Param = FD->getParamDecl(p);
668 if (Param->hasDefaultArg())
672 // C++ [dcl.fct.default]p4:
673 // In a given function declaration, all parameters
674 // subsequent to a parameter with a default argument shall
675 // have default arguments supplied in this or previous
676 // declarations. A default argument shall not be redefined
677 // by a later declaration (not even to the same value).
678 unsigned LastMissingDefaultArg = 0;
679 for (; p < NumParams; ++p) {
680 ParmVarDecl *Param = FD->getParamDecl(p);
681 if (!Param->hasDefaultArg()) {
682 if (Param->isInvalidDecl())
683 /* We already complained about this parameter. */;
684 else if (Param->getIdentifier())
685 Diag(Param->getLocation(),
686 diag::err_param_default_argument_missing_name)
687 << Param->getIdentifier();
689 Diag(Param->getLocation(),
690 diag::err_param_default_argument_missing);
692 LastMissingDefaultArg = p;
696 if (LastMissingDefaultArg > 0) {
697 // Some default arguments were missing. Clear out all of the
698 // default arguments up to (and including) the last missing
699 // default argument, so that we leave the function parameters
700 // in a semantically valid state.
701 for (p = 0; p <= LastMissingDefaultArg; ++p) {
702 ParmVarDecl *Param = FD->getParamDecl(p);
703 if (Param->hasDefaultArg()) {
704 Param->setDefaultArg(0);
710 // CheckConstexprParameterTypes - Check whether a function's parameter types
711 // are all literal types. If so, return true. If not, produce a suitable
712 // diagnostic and return false.
713 static bool CheckConstexprParameterTypes(Sema &SemaRef,
714 const FunctionDecl *FD) {
715 unsigned ArgIndex = 0;
716 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>();
717 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(),
718 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) {
719 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex);
720 SourceLocation ParamLoc = PD->getLocation();
721 if (!(*i)->isDependentType() &&
722 SemaRef.RequireLiteralType(ParamLoc, *i,
723 diag::err_constexpr_non_literal_param,
724 ArgIndex+1, PD->getSourceRange(),
725 isa<CXXConstructorDecl>(FD)))
731 /// \brief Get diagnostic %select index for tag kind for
732 /// record diagnostic message.
733 /// WARNING: Indexes apply to particular diagnostics only!
735 /// \returns diagnostic %select index.
736 static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) {
738 case TTK_Struct: return 0;
739 case TTK_Interface: return 1;
740 case TTK_Class: return 2;
741 default: llvm_unreachable("Invalid tag kind for record diagnostic!");
745 // CheckConstexprFunctionDecl - Check whether a function declaration satisfies
746 // the requirements of a constexpr function definition or a constexpr
747 // constructor definition. If so, return true. If not, produce appropriate
748 // diagnostics and return false.
750 // This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360.
751 bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) {
752 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
753 if (MD && MD->isInstance()) {
754 // C++11 [dcl.constexpr]p4:
755 // The definition of a constexpr constructor shall satisfy the following
757 // - the class shall not have any virtual base classes;
758 const CXXRecordDecl *RD = MD->getParent();
759 if (RD->getNumVBases()) {
760 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base)
761 << isa<CXXConstructorDecl>(NewFD)
762 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases();
763 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(),
764 E = RD->vbases_end(); I != E; ++I)
765 Diag(I->getLocStart(),
766 diag::note_constexpr_virtual_base_here) << I->getSourceRange();
771 if (!isa<CXXConstructorDecl>(NewFD)) {
772 // C++11 [dcl.constexpr]p3:
773 // The definition of a constexpr function shall satisfy the following
775 // - it shall not be virtual;
776 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD);
777 if (Method && Method->isVirtual()) {
778 Diag(NewFD->getLocation(), diag::err_constexpr_virtual);
780 // If it's not obvious why this function is virtual, find an overridden
781 // function which uses the 'virtual' keyword.
782 const CXXMethodDecl *WrittenVirtual = Method;
783 while (!WrittenVirtual->isVirtualAsWritten())
784 WrittenVirtual = *WrittenVirtual->begin_overridden_methods();
785 if (WrittenVirtual != Method)
786 Diag(WrittenVirtual->getLocation(),
787 diag::note_overridden_virtual_function);
791 // - its return type shall be a literal type;
792 QualType RT = NewFD->getResultType();
793 if (!RT->isDependentType() &&
794 RequireLiteralType(NewFD->getLocation(), RT,
795 diag::err_constexpr_non_literal_return))
799 // - each of its parameter types shall be a literal type;
800 if (!CheckConstexprParameterTypes(*this, NewFD))
806 /// Check the given declaration statement is legal within a constexpr function
807 /// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3.
809 /// \return true if the body is OK (maybe only as an extension), false if we
810 /// have diagnosed a problem.
811 static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl,
812 DeclStmt *DS, SourceLocation &Cxx1yLoc) {
813 // C++11 [dcl.constexpr]p3 and p4:
814 // The definition of a constexpr function(p3) or constructor(p4) [...] shall
816 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(),
817 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) {
818 switch ((*DclIt)->getKind()) {
819 case Decl::StaticAssert:
821 case Decl::UsingShadow:
822 case Decl::UsingDirective:
823 case Decl::UnresolvedUsingTypename:
824 case Decl::UnresolvedUsingValue:
825 // - static_assert-declarations
826 // - using-declarations,
827 // - using-directives,
831 case Decl::TypeAlias: {
832 // - typedef declarations and alias-declarations that do not define
833 // classes or enumerations,
834 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt);
835 if (TN->getUnderlyingType()->isVariablyModifiedType()) {
836 // Don't allow variably-modified types in constexpr functions.
837 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc();
838 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla)
839 << TL.getSourceRange() << TL.getType()
840 << isa<CXXConstructorDecl>(Dcl);
847 case Decl::CXXRecord:
848 // C++1y allows types to be defined, not just declared.
849 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition())
850 SemaRef.Diag(DS->getLocStart(),
851 SemaRef.getLangOpts().CPlusPlus1y
852 ? diag::warn_cxx11_compat_constexpr_type_definition
853 : diag::ext_constexpr_type_definition)
854 << isa<CXXConstructorDecl>(Dcl);
857 case Decl::EnumConstant:
858 case Decl::IndirectField:
860 // These can only appear with other declarations which are banned in
861 // C++11 and permitted in C++1y, so ignore them.
865 // C++1y [dcl.constexpr]p3 allows anything except:
866 // a definition of a variable of non-literal type or of static or
867 // thread storage duration or for which no initialization is performed.
868 VarDecl *VD = cast<VarDecl>(*DclIt);
869 if (VD->isThisDeclarationADefinition()) {
870 if (VD->isStaticLocal()) {
871 SemaRef.Diag(VD->getLocation(),
872 diag::err_constexpr_local_var_static)
873 << isa<CXXConstructorDecl>(Dcl)
874 << (VD->getTLSKind() == VarDecl::TLS_Dynamic);
877 if (!VD->getType()->isDependentType() &&
878 SemaRef.RequireLiteralType(
879 VD->getLocation(), VD->getType(),
880 diag::err_constexpr_local_var_non_literal_type,
881 isa<CXXConstructorDecl>(Dcl)))
883 if (!VD->hasInit() && !VD->isCXXForRangeDecl()) {
884 SemaRef.Diag(VD->getLocation(),
885 diag::err_constexpr_local_var_no_init)
886 << isa<CXXConstructorDecl>(Dcl);
890 SemaRef.Diag(VD->getLocation(),
891 SemaRef.getLangOpts().CPlusPlus1y
892 ? diag::warn_cxx11_compat_constexpr_local_var
893 : diag::ext_constexpr_local_var)
894 << isa<CXXConstructorDecl>(Dcl);
898 case Decl::NamespaceAlias:
900 // These are disallowed in C++11 and permitted in C++1y. Allow them
901 // everywhere as an extension.
902 if (!Cxx1yLoc.isValid())
903 Cxx1yLoc = DS->getLocStart();
907 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt)
908 << isa<CXXConstructorDecl>(Dcl);
916 /// Check that the given field is initialized within a constexpr constructor.
918 /// \param Dcl The constexpr constructor being checked.
919 /// \param Field The field being checked. This may be a member of an anonymous
920 /// struct or union nested within the class being checked.
921 /// \param Inits All declarations, including anonymous struct/union members and
922 /// indirect members, for which any initialization was provided.
923 /// \param Diagnosed Set to true if an error is produced.
924 static void CheckConstexprCtorInitializer(Sema &SemaRef,
925 const FunctionDecl *Dcl,
927 llvm::SmallSet<Decl*, 16> &Inits,
929 if (Field->isInvalidDecl())
932 if (Field->isUnnamedBitfield())
935 if (Field->isAnonymousStructOrUnion() &&
936 Field->getType()->getAsCXXRecordDecl()->isEmpty())
939 if (!Inits.count(Field)) {
941 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init);
944 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init);
945 } else if (Field->isAnonymousStructOrUnion()) {
946 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl();
947 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end();
949 // If an anonymous union contains an anonymous struct of which any member
950 // is initialized, all members must be initialized.
951 if (!RD->isUnion() || Inits.count(*I))
952 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed);
956 /// Check the provided statement is allowed in a constexpr function
959 CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S,
960 SmallVectorImpl<SourceLocation> &ReturnStmts,
961 SourceLocation &Cxx1yLoc) {
962 // - its function-body shall be [...] a compound-statement that contains only
963 switch (S->getStmtClass()) {
964 case Stmt::NullStmtClass:
965 // - null statements,
968 case Stmt::DeclStmtClass:
969 // - static_assert-declarations
970 // - using-declarations,
971 // - using-directives,
972 // - typedef declarations and alias-declarations that do not define
973 // classes or enumerations,
974 if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc))
978 case Stmt::ReturnStmtClass:
979 // - and exactly one return statement;
980 if (isa<CXXConstructorDecl>(Dcl)) {
981 // C++1y allows return statements in constexpr constructors.
982 if (!Cxx1yLoc.isValid())
983 Cxx1yLoc = S->getLocStart();
987 ReturnStmts.push_back(S->getLocStart());
990 case Stmt::CompoundStmtClass: {
991 // C++1y allows compound-statements.
992 if (!Cxx1yLoc.isValid())
993 Cxx1yLoc = S->getLocStart();
995 CompoundStmt *CompStmt = cast<CompoundStmt>(S);
996 for (CompoundStmt::body_iterator BodyIt = CompStmt->body_begin(),
997 BodyEnd = CompStmt->body_end(); BodyIt != BodyEnd; ++BodyIt) {
998 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, *BodyIt, ReturnStmts,
1005 case Stmt::AttributedStmtClass:
1006 if (!Cxx1yLoc.isValid())
1007 Cxx1yLoc = S->getLocStart();
1010 case Stmt::IfStmtClass: {
1011 // C++1y allows if-statements.
1012 if (!Cxx1yLoc.isValid())
1013 Cxx1yLoc = S->getLocStart();
1015 IfStmt *If = cast<IfStmt>(S);
1016 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts,
1019 if (If->getElse() &&
1020 !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts,
1026 case Stmt::WhileStmtClass:
1027 case Stmt::DoStmtClass:
1028 case Stmt::ForStmtClass:
1029 case Stmt::CXXForRangeStmtClass:
1030 case Stmt::ContinueStmtClass:
1031 // C++1y allows all of these. We don't allow them as extensions in C++11,
1032 // because they don't make sense without variable mutation.
1033 if (!SemaRef.getLangOpts().CPlusPlus1y)
1035 if (!Cxx1yLoc.isValid())
1036 Cxx1yLoc = S->getLocStart();
1037 for (Stmt::child_range Children = S->children(); Children; ++Children)
1039 !CheckConstexprFunctionStmt(SemaRef, Dcl, *Children, ReturnStmts,
1044 case Stmt::SwitchStmtClass:
1045 case Stmt::CaseStmtClass:
1046 case Stmt::DefaultStmtClass:
1047 case Stmt::BreakStmtClass:
1048 // C++1y allows switch-statements, and since they don't need variable
1049 // mutation, we can reasonably allow them in C++11 as an extension.
1050 if (!Cxx1yLoc.isValid())
1051 Cxx1yLoc = S->getLocStart();
1052 for (Stmt::child_range Children = S->children(); Children; ++Children)
1054 !CheckConstexprFunctionStmt(SemaRef, Dcl, *Children, ReturnStmts,
1063 // C++1y allows expression-statements.
1064 if (!Cxx1yLoc.isValid())
1065 Cxx1yLoc = S->getLocStart();
1069 SemaRef.Diag(S->getLocStart(), diag::err_constexpr_body_invalid_stmt)
1070 << isa<CXXConstructorDecl>(Dcl);
1074 /// Check the body for the given constexpr function declaration only contains
1075 /// the permitted types of statement. C++11 [dcl.constexpr]p3,p4.
1077 /// \return true if the body is OK, false if we have diagnosed a problem.
1078 bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) {
1079 if (isa<CXXTryStmt>(Body)) {
1080 // C++11 [dcl.constexpr]p3:
1081 // The definition of a constexpr function shall satisfy the following
1082 // constraints: [...]
1083 // - its function-body shall be = delete, = default, or a
1084 // compound-statement
1086 // C++11 [dcl.constexpr]p4:
1087 // In the definition of a constexpr constructor, [...]
1088 // - its function-body shall not be a function-try-block;
1089 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block)
1090 << isa<CXXConstructorDecl>(Dcl);
1094 SmallVector<SourceLocation, 4> ReturnStmts;
1096 // - its function-body shall be [...] a compound-statement that contains only
1097 // [... list of cases ...]
1098 CompoundStmt *CompBody = cast<CompoundStmt>(Body);
1099 SourceLocation Cxx1yLoc;
1100 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(),
1101 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) {
1102 if (!CheckConstexprFunctionStmt(*this, Dcl, *BodyIt, ReturnStmts, Cxx1yLoc))
1106 if (Cxx1yLoc.isValid())
1108 getLangOpts().CPlusPlus1y
1109 ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt
1110 : diag::ext_constexpr_body_invalid_stmt)
1111 << isa<CXXConstructorDecl>(Dcl);
1113 if (const CXXConstructorDecl *Constructor
1114 = dyn_cast<CXXConstructorDecl>(Dcl)) {
1115 const CXXRecordDecl *RD = Constructor->getParent();
1117 // - every non-variant non-static data member and base class sub-object
1118 // shall be initialized;
1119 // - if the class is a non-empty union, or for each non-empty anonymous
1120 // union member of a non-union class, exactly one non-static data member
1121 // shall be initialized;
1122 if (RD->isUnion()) {
1123 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) {
1124 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init);
1127 } else if (!Constructor->isDependentContext() &&
1128 !Constructor->isDelegatingConstructor()) {
1129 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases");
1131 // Skip detailed checking if we have enough initializers, and we would
1132 // allow at most one initializer per member.
1133 bool AnyAnonStructUnionMembers = false;
1134 unsigned Fields = 0;
1135 for (CXXRecordDecl::field_iterator I = RD->field_begin(),
1136 E = RD->field_end(); I != E; ++I, ++Fields) {
1137 if (I->isAnonymousStructOrUnion()) {
1138 AnyAnonStructUnionMembers = true;
1142 if (AnyAnonStructUnionMembers ||
1143 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) {
1144 // Check initialization of non-static data members. Base classes are
1145 // always initialized so do not need to be checked. Dependent bases
1146 // might not have initializers in the member initializer list.
1147 llvm::SmallSet<Decl*, 16> Inits;
1148 for (CXXConstructorDecl::init_const_iterator
1149 I = Constructor->init_begin(), E = Constructor->init_end();
1151 if (FieldDecl *FD = (*I)->getMember())
1153 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember())
1154 Inits.insert(ID->chain_begin(), ID->chain_end());
1157 bool Diagnosed = false;
1158 for (CXXRecordDecl::field_iterator I = RD->field_begin(),
1159 E = RD->field_end(); I != E; ++I)
1160 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed);
1166 if (ReturnStmts.empty()) {
1167 // C++1y doesn't require constexpr functions to contain a 'return'
1168 // statement. We still do, unless the return type is void, because
1169 // otherwise if there's no return statement, the function cannot
1170 // be used in a core constant expression.
1171 bool OK = getLangOpts().CPlusPlus1y && Dcl->getResultType()->isVoidType();
1172 Diag(Dcl->getLocation(),
1173 OK ? diag::warn_cxx11_compat_constexpr_body_no_return
1174 : diag::err_constexpr_body_no_return);
1177 if (ReturnStmts.size() > 1) {
1178 Diag(ReturnStmts.back(),
1179 getLangOpts().CPlusPlus1y
1180 ? diag::warn_cxx11_compat_constexpr_body_multiple_return
1181 : diag::ext_constexpr_body_multiple_return);
1182 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I)
1183 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return);
1187 // C++11 [dcl.constexpr]p5:
1188 // if no function argument values exist such that the function invocation
1189 // substitution would produce a constant expression, the program is
1190 // ill-formed; no diagnostic required.
1191 // C++11 [dcl.constexpr]p3:
1192 // - every constructor call and implicit conversion used in initializing the
1193 // return value shall be one of those allowed in a constant expression.
1194 // C++11 [dcl.constexpr]p4:
1195 // - every constructor involved in initializing non-static data members and
1196 // base class sub-objects shall be a constexpr constructor.
1197 SmallVector<PartialDiagnosticAt, 8> Diags;
1198 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) {
1199 Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr)
1200 << isa<CXXConstructorDecl>(Dcl);
1201 for (size_t I = 0, N = Diags.size(); I != N; ++I)
1202 Diag(Diags[I].first, Diags[I].second);
1203 // Don't return false here: we allow this for compatibility in
1210 /// isCurrentClassName - Determine whether the identifier II is the
1211 /// name of the class type currently being defined. In the case of
1212 /// nested classes, this will only return true if II is the name of
1213 /// the innermost class.
1214 bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *,
1215 const CXXScopeSpec *SS) {
1216 assert(getLangOpts().CPlusPlus && "No class names in C!");
1218 CXXRecordDecl *CurDecl;
1219 if (SS && SS->isSet() && !SS->isInvalid()) {
1220 DeclContext *DC = computeDeclContext(*SS, true);
1221 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
1223 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
1225 if (CurDecl && CurDecl->getIdentifier())
1226 return &II == CurDecl->getIdentifier();
1230 /// \brief Determine whether the identifier II is a typo for the name of
1231 /// the class type currently being defined. If so, update it to the identifier
1232 /// that should have been used.
1233 bool Sema::isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS) {
1234 assert(getLangOpts().CPlusPlus && "No class names in C!");
1236 if (!getLangOpts().SpellChecking)
1239 CXXRecordDecl *CurDecl;
1240 if (SS && SS->isSet() && !SS->isInvalid()) {
1241 DeclContext *DC = computeDeclContext(*SS, true);
1242 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
1244 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
1246 if (CurDecl && CurDecl->getIdentifier() && II != CurDecl->getIdentifier() &&
1247 3 * II->getName().edit_distance(CurDecl->getIdentifier()->getName())
1248 < II->getLength()) {
1249 II = CurDecl->getIdentifier();
1256 /// \brief Determine whether the given class is a base class of the given
1257 /// class, including looking at dependent bases.
1258 static bool findCircularInheritance(const CXXRecordDecl *Class,
1259 const CXXRecordDecl *Current) {
1260 SmallVector<const CXXRecordDecl*, 8> Queue;
1262 Class = Class->getCanonicalDecl();
1264 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(),
1265 E = Current->bases_end();
1267 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl();
1271 Base = Base->getDefinition();
1275 if (Base->getCanonicalDecl() == Class)
1278 Queue.push_back(Base);
1284 Current = Queue.pop_back_val();
1290 /// \brief Check the validity of a C++ base class specifier.
1292 /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics
1293 /// and returns NULL otherwise.
1295 Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
1296 SourceRange SpecifierRange,
1297 bool Virtual, AccessSpecifier Access,
1298 TypeSourceInfo *TInfo,
1299 SourceLocation EllipsisLoc) {
1300 QualType BaseType = TInfo->getType();
1302 // C++ [class.union]p1:
1303 // A union shall not have base classes.
1304 if (Class->isUnion()) {
1305 Diag(Class->getLocation(), diag::err_base_clause_on_union)
1310 if (EllipsisLoc.isValid() &&
1311 !TInfo->getType()->containsUnexpandedParameterPack()) {
1312 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
1313 << TInfo->getTypeLoc().getSourceRange();
1314 EllipsisLoc = SourceLocation();
1317 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc();
1319 if (BaseType->isDependentType()) {
1320 // Make sure that we don't have circular inheritance among our dependent
1321 // bases. For non-dependent bases, the check for completeness below handles
1323 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) {
1324 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() ||
1325 ((BaseDecl = BaseDecl->getDefinition()) &&
1326 findCircularInheritance(Class, BaseDecl))) {
1327 Diag(BaseLoc, diag::err_circular_inheritance)
1328 << BaseType << Context.getTypeDeclType(Class);
1330 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl())
1331 Diag(BaseDecl->getLocation(), diag::note_previous_decl)
1338 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
1339 Class->getTagKind() == TTK_Class,
1340 Access, TInfo, EllipsisLoc);
1343 // Base specifiers must be record types.
1344 if (!BaseType->isRecordType()) {
1345 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange;
1349 // C++ [class.union]p1:
1350 // A union shall not be used as a base class.
1351 if (BaseType->isUnionType()) {
1352 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange;
1356 // C++ [class.derived]p2:
1357 // The class-name in a base-specifier shall not be an incompletely
1359 if (RequireCompleteType(BaseLoc, BaseType,
1360 diag::err_incomplete_base_class, SpecifierRange)) {
1361 Class->setInvalidDecl();
1365 // If the base class is polymorphic or isn't empty, the new one is/isn't, too.
1366 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl();
1367 assert(BaseDecl && "Record type has no declaration");
1368 BaseDecl = BaseDecl->getDefinition();
1369 assert(BaseDecl && "Base type is not incomplete, but has no definition");
1370 CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl);
1371 assert(CXXBaseDecl && "Base type is not a C++ type");
1373 // A class which contains a flexible array member is not suitable for use as a
1375 // - If the layout determines that a base comes before another base,
1376 // the flexible array member would index into the subsequent base.
1377 // - If the layout determines that base comes before the derived class,
1378 // the flexible array member would index into the derived class.
1379 if (CXXBaseDecl->hasFlexibleArrayMember()) {
1380 Diag(BaseLoc, diag::err_base_class_has_flexible_array_member)
1381 << CXXBaseDecl->getDeclName();
1386 // If a class is marked final and it appears as a base-type-specifier in
1387 // base-clause, the program is ill-formed.
1388 if (FinalAttr *FA = CXXBaseDecl->getAttr<FinalAttr>()) {
1389 Diag(BaseLoc, diag::err_class_marked_final_used_as_base)
1390 << CXXBaseDecl->getDeclName()
1391 << FA->isSpelledAsSealed();
1392 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl)
1393 << CXXBaseDecl->getDeclName();
1397 if (BaseDecl->isInvalidDecl())
1398 Class->setInvalidDecl();
1400 // Create the base specifier.
1401 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
1402 Class->getTagKind() == TTK_Class,
1403 Access, TInfo, EllipsisLoc);
1406 /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
1407 /// one entry in the base class list of a class specifier, for
1409 /// class foo : public bar, virtual private baz {
1410 /// 'public bar' and 'virtual private baz' are each base-specifiers.
1412 Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange,
1413 ParsedAttributes &Attributes,
1414 bool Virtual, AccessSpecifier Access,
1415 ParsedType basetype, SourceLocation BaseLoc,
1416 SourceLocation EllipsisLoc) {
1420 AdjustDeclIfTemplate(classdecl);
1421 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl);
1425 // We do not support any C++11 attributes on base-specifiers yet.
1426 // Diagnose any attributes we see.
1427 if (!Attributes.empty()) {
1428 for (AttributeList *Attr = Attributes.getList(); Attr;
1429 Attr = Attr->getNext()) {
1430 if (Attr->isInvalid() ||
1431 Attr->getKind() == AttributeList::IgnoredAttribute)
1433 Diag(Attr->getLoc(),
1434 Attr->getKind() == AttributeList::UnknownAttribute
1435 ? diag::warn_unknown_attribute_ignored
1436 : diag::err_base_specifier_attribute)
1441 TypeSourceInfo *TInfo = 0;
1442 GetTypeFromParser(basetype, &TInfo);
1444 if (EllipsisLoc.isInvalid() &&
1445 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo,
1449 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange,
1450 Virtual, Access, TInfo,
1454 Class->setInvalidDecl();
1459 /// \brief Performs the actual work of attaching the given base class
1460 /// specifiers to a C++ class.
1461 bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases,
1462 unsigned NumBases) {
1466 // Used to keep track of which base types we have already seen, so
1467 // that we can properly diagnose redundant direct base types. Note
1468 // that the key is always the unqualified canonical type of the base
1470 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes;
1472 // Copy non-redundant base specifiers into permanent storage.
1473 unsigned NumGoodBases = 0;
1474 bool Invalid = false;
1475 for (unsigned idx = 0; idx < NumBases; ++idx) {
1476 QualType NewBaseType
1477 = Context.getCanonicalType(Bases[idx]->getType());
1478 NewBaseType = NewBaseType.getLocalUnqualifiedType();
1480 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType];
1482 // C++ [class.mi]p3:
1483 // A class shall not be specified as a direct base class of a
1484 // derived class more than once.
1485 Diag(Bases[idx]->getLocStart(),
1486 diag::err_duplicate_base_class)
1487 << KnownBase->getType()
1488 << Bases[idx]->getSourceRange();
1490 // Delete the duplicate base class specifier; we're going to
1491 // overwrite its pointer later.
1492 Context.Deallocate(Bases[idx]);
1496 // Okay, add this new base class.
1497 KnownBase = Bases[idx];
1498 Bases[NumGoodBases++] = Bases[idx];
1499 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) {
1500 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
1501 if (Class->isInterface() &&
1502 (!RD->isInterface() ||
1503 KnownBase->getAccessSpecifier() != AS_public)) {
1504 // The Microsoft extension __interface does not permit bases that
1505 // are not themselves public interfaces.
1506 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface)
1507 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName()
1508 << RD->getSourceRange();
1511 if (RD->hasAttr<WeakAttr>())
1512 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context));
1517 // Attach the remaining base class specifiers to the derived class.
1518 Class->setBases(Bases, NumGoodBases);
1520 // Delete the remaining (good) base class specifiers, since their
1521 // data has been copied into the CXXRecordDecl.
1522 for (unsigned idx = 0; idx < NumGoodBases; ++idx)
1523 Context.Deallocate(Bases[idx]);
1528 /// ActOnBaseSpecifiers - Attach the given base specifiers to the
1529 /// class, after checking whether there are any duplicate base
1531 void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases,
1532 unsigned NumBases) {
1533 if (!ClassDecl || !Bases || !NumBases)
1536 AdjustDeclIfTemplate(ClassDecl);
1537 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), Bases, NumBases);
1540 /// \brief Determine whether the type \p Derived is a C++ class that is
1541 /// derived from the type \p Base.
1542 bool Sema::IsDerivedFrom(QualType Derived, QualType Base) {
1543 if (!getLangOpts().CPlusPlus)
1546 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl();
1550 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl();
1554 // If either the base or the derived type is invalid, don't try to
1555 // check whether one is derived from the other.
1556 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl())
1559 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this.
1560 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD);
1563 /// \brief Determine whether the type \p Derived is a C++ class that is
1564 /// derived from the type \p Base.
1565 bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) {
1566 if (!getLangOpts().CPlusPlus)
1569 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl();
1573 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl();
1577 return DerivedRD->isDerivedFrom(BaseRD, Paths);
1580 void Sema::BuildBasePathArray(const CXXBasePaths &Paths,
1581 CXXCastPath &BasePathArray) {
1582 assert(BasePathArray.empty() && "Base path array must be empty!");
1583 assert(Paths.isRecordingPaths() && "Must record paths!");
1585 const CXXBasePath &Path = Paths.front();
1587 // We first go backward and check if we have a virtual base.
1588 // FIXME: It would be better if CXXBasePath had the base specifier for
1589 // the nearest virtual base.
1591 for (unsigned I = Path.size(); I != 0; --I) {
1592 if (Path[I - 1].Base->isVirtual()) {
1598 // Now add all bases.
1599 for (unsigned I = Start, E = Path.size(); I != E; ++I)
1600 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base));
1603 /// \brief Determine whether the given base path includes a virtual
1605 bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) {
1606 for (CXXCastPath::const_iterator B = BasePath.begin(),
1607 BEnd = BasePath.end();
1609 if ((*B)->isVirtual())
1615 /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base
1616 /// conversion (where Derived and Base are class types) is
1617 /// well-formed, meaning that the conversion is unambiguous (and
1618 /// that all of the base classes are accessible). Returns true
1619 /// and emits a diagnostic if the code is ill-formed, returns false
1620 /// otherwise. Loc is the location where this routine should point to
1621 /// if there is an error, and Range is the source range to highlight
1622 /// if there is an error.
1624 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
1625 unsigned InaccessibleBaseID,
1626 unsigned AmbigiousBaseConvID,
1627 SourceLocation Loc, SourceRange Range,
1628 DeclarationName Name,
1629 CXXCastPath *BasePath) {
1630 // First, determine whether the path from Derived to Base is
1631 // ambiguous. This is slightly more expensive than checking whether
1632 // the Derived to Base conversion exists, because here we need to
1633 // explore multiple paths to determine if there is an ambiguity.
1634 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1635 /*DetectVirtual=*/false);
1636 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths);
1637 assert(DerivationOkay &&
1638 "Can only be used with a derived-to-base conversion");
1639 (void)DerivationOkay;
1641 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) {
1642 if (InaccessibleBaseID) {
1643 // Check that the base class can be accessed.
1644 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(),
1645 InaccessibleBaseID)) {
1646 case AR_inaccessible:
1655 // Build a base path if necessary.
1657 BuildBasePathArray(Paths, *BasePath);
1661 if (AmbigiousBaseConvID) {
1662 // We know that the derived-to-base conversion is ambiguous, and
1663 // we're going to produce a diagnostic. Perform the derived-to-base
1664 // search just one more time to compute all of the possible paths so
1665 // that we can print them out. This is more expensive than any of
1666 // the previous derived-to-base checks we've done, but at this point
1667 // performance isn't as much of an issue.
1669 Paths.setRecordingPaths(true);
1670 bool StillOkay = IsDerivedFrom(Derived, Base, Paths);
1671 assert(StillOkay && "Can only be used with a derived-to-base conversion");
1674 // Build up a textual representation of the ambiguous paths, e.g.,
1675 // D -> B -> A, that will be used to illustrate the ambiguous
1676 // conversions in the diagnostic. We only print one of the paths
1677 // to each base class subobject.
1678 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths);
1680 Diag(Loc, AmbigiousBaseConvID)
1681 << Derived << Base << PathDisplayStr << Range << Name;
1687 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
1688 SourceLocation Loc, SourceRange Range,
1689 CXXCastPath *BasePath,
1690 bool IgnoreAccess) {
1691 return CheckDerivedToBaseConversion(Derived, Base,
1693 : diag::err_upcast_to_inaccessible_base,
1694 diag::err_ambiguous_derived_to_base_conv,
1695 Loc, Range, DeclarationName(),
1700 /// @brief Builds a string representing ambiguous paths from a
1701 /// specific derived class to different subobjects of the same base
1704 /// This function builds a string that can be used in error messages
1705 /// to show the different paths that one can take through the
1706 /// inheritance hierarchy to go from the derived class to different
1707 /// subobjects of a base class. The result looks something like this:
1709 /// struct D -> struct B -> struct A
1710 /// struct D -> struct C -> struct A
1712 std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) {
1713 std::string PathDisplayStr;
1714 std::set<unsigned> DisplayedPaths;
1715 for (CXXBasePaths::paths_iterator Path = Paths.begin();
1716 Path != Paths.end(); ++Path) {
1717 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) {
1718 // We haven't displayed a path to this particular base
1719 // class subobject yet.
1720 PathDisplayStr += "\n ";
1721 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString();
1722 for (CXXBasePath::const_iterator Element = Path->begin();
1723 Element != Path->end(); ++Element)
1724 PathDisplayStr += " -> " + Element->Base->getType().getAsString();
1728 return PathDisplayStr;
1731 //===----------------------------------------------------------------------===//
1732 // C++ class member Handling
1733 //===----------------------------------------------------------------------===//
1735 /// ActOnAccessSpecifier - Parsed an access specifier followed by a colon.
1736 bool Sema::ActOnAccessSpecifier(AccessSpecifier Access,
1737 SourceLocation ASLoc,
1738 SourceLocation ColonLoc,
1739 AttributeList *Attrs) {
1740 assert(Access != AS_none && "Invalid kind for syntactic access specifier!");
1741 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext,
1743 CurContext->addHiddenDecl(ASDecl);
1744 return ProcessAccessDeclAttributeList(ASDecl, Attrs);
1747 /// CheckOverrideControl - Check C++11 override control semantics.
1748 void Sema::CheckOverrideControl(NamedDecl *D) {
1749 if (D->isInvalidDecl())
1752 // We only care about "override" and "final" declarations.
1753 if (!D->hasAttr<OverrideAttr>() && !D->hasAttr<FinalAttr>())
1756 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D);
1758 // We can't check dependent instance methods.
1759 if (MD && MD->isInstance() &&
1760 (MD->getParent()->hasAnyDependentBases() ||
1761 MD->getType()->isDependentType()))
1764 if (MD && !MD->isVirtual()) {
1765 // If we have a non-virtual method, check if if hides a virtual method.
1766 // (In that case, it's most likely the method has the wrong type.)
1767 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
1768 FindHiddenVirtualMethods(MD, OverloadedMethods);
1770 if (!OverloadedMethods.empty()) {
1771 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) {
1772 Diag(OA->getLocation(),
1773 diag::override_keyword_hides_virtual_member_function)
1774 << "override" << (OverloadedMethods.size() > 1);
1775 } else if (FinalAttr *FA = D->getAttr<FinalAttr>()) {
1776 Diag(FA->getLocation(),
1777 diag::override_keyword_hides_virtual_member_function)
1778 << (FA->isSpelledAsSealed() ? "sealed" : "final")
1779 << (OverloadedMethods.size() > 1);
1781 NoteHiddenVirtualMethods(MD, OverloadedMethods);
1782 MD->setInvalidDecl();
1785 // Fall through into the general case diagnostic.
1786 // FIXME: We might want to attempt typo correction here.
1789 if (!MD || !MD->isVirtual()) {
1790 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) {
1791 Diag(OA->getLocation(),
1792 diag::override_keyword_only_allowed_on_virtual_member_functions)
1793 << "override" << FixItHint::CreateRemoval(OA->getLocation());
1794 D->dropAttr<OverrideAttr>();
1796 if (FinalAttr *FA = D->getAttr<FinalAttr>()) {
1797 Diag(FA->getLocation(),
1798 diag::override_keyword_only_allowed_on_virtual_member_functions)
1799 << (FA->isSpelledAsSealed() ? "sealed" : "final")
1800 << FixItHint::CreateRemoval(FA->getLocation());
1801 D->dropAttr<FinalAttr>();
1806 // C++11 [class.virtual]p5:
1807 // If a virtual function is marked with the virt-specifier override and
1808 // does not override a member function of a base class, the program is
1810 bool HasOverriddenMethods =
1811 MD->begin_overridden_methods() != MD->end_overridden_methods();
1812 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods)
1813 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding)
1814 << MD->getDeclName();
1817 /// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member
1818 /// function overrides a virtual member function marked 'final', according to
1819 /// C++11 [class.virtual]p4.
1820 bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New,
1821 const CXXMethodDecl *Old) {
1822 FinalAttr *FA = Old->getAttr<FinalAttr>();
1826 Diag(New->getLocation(), diag::err_final_function_overridden)
1827 << New->getDeclName()
1828 << FA->isSpelledAsSealed();
1829 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
1833 static bool InitializationHasSideEffects(const FieldDecl &FD) {
1834 const Type *T = FD.getType()->getBaseElementTypeUnsafe();
1835 // FIXME: Destruction of ObjC lifetime types has side-effects.
1836 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
1837 return !RD->isCompleteDefinition() ||
1838 !RD->hasTrivialDefaultConstructor() ||
1839 !RD->hasTrivialDestructor();
1843 static AttributeList *getMSPropertyAttr(AttributeList *list) {
1844 for (AttributeList* it = list; it != 0; it = it->getNext())
1845 if (it->isDeclspecPropertyAttribute())
1850 /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member
1851 /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the
1852 /// bitfield width if there is one, 'InitExpr' specifies the initializer if
1853 /// one has been parsed, and 'InitStyle' is set if an in-class initializer is
1854 /// present (but parsing it has been deferred).
1856 Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
1857 MultiTemplateParamsArg TemplateParameterLists,
1858 Expr *BW, const VirtSpecifiers &VS,
1859 InClassInitStyle InitStyle) {
1860 const DeclSpec &DS = D.getDeclSpec();
1861 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
1862 DeclarationName Name = NameInfo.getName();
1863 SourceLocation Loc = NameInfo.getLoc();
1865 // For anonymous bitfields, the location should point to the type.
1866 if (Loc.isInvalid())
1867 Loc = D.getLocStart();
1869 Expr *BitWidth = static_cast<Expr*>(BW);
1871 assert(isa<CXXRecordDecl>(CurContext));
1872 assert(!DS.isFriendSpecified());
1874 bool isFunc = D.isDeclarationOfFunction();
1876 if (cast<CXXRecordDecl>(CurContext)->isInterface()) {
1877 // The Microsoft extension __interface only permits public member functions
1878 // and prohibits constructors, destructors, operators, non-public member
1879 // functions, static methods and data members.
1880 unsigned InvalidDecl;
1881 bool ShowDeclName = true;
1883 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1;
1884 else if (AS != AS_public)
1886 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static)
1888 else switch (Name.getNameKind()) {
1889 case DeclarationName::CXXConstructorName:
1891 ShowDeclName = false;
1894 case DeclarationName::CXXDestructorName:
1896 ShowDeclName = false;
1899 case DeclarationName::CXXOperatorName:
1900 case DeclarationName::CXXConversionFunctionName:
1911 Diag(Loc, diag::err_invalid_member_in_interface)
1912 << (InvalidDecl-1) << Name;
1914 Diag(Loc, diag::err_invalid_member_in_interface)
1915 << (InvalidDecl-1) << "";
1920 // C++ 9.2p6: A member shall not be declared to have automatic storage
1921 // duration (auto, register) or with the extern storage-class-specifier.
1922 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class
1923 // data members and cannot be applied to names declared const or static,
1924 // and cannot be applied to reference members.
1925 switch (DS.getStorageClassSpec()) {
1926 case DeclSpec::SCS_unspecified:
1927 case DeclSpec::SCS_typedef:
1928 case DeclSpec::SCS_static:
1930 case DeclSpec::SCS_mutable:
1932 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function);
1934 // FIXME: It would be nicer if the keyword was ignored only for this
1935 // declarator. Otherwise we could get follow-up errors.
1936 D.getMutableDeclSpec().ClearStorageClassSpecs();
1940 Diag(DS.getStorageClassSpecLoc(),
1941 diag::err_storageclass_invalid_for_member);
1942 D.getMutableDeclSpec().ClearStorageClassSpecs();
1946 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
1947 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
1950 if (DS.isConstexprSpecified() && isInstField) {
1951 SemaDiagnosticBuilder B =
1952 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member);
1953 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc();
1954 if (InitStyle == ICIS_NoInit) {
1955 B << 0 << 0 << FixItHint::CreateReplacement(ConstexprLoc, "const");
1956 D.getMutableDeclSpec().ClearConstexprSpec();
1957 const char *PrevSpec;
1959 bool Failed = D.getMutableDeclSpec().SetTypeQual(DeclSpec::TQ_const, ConstexprLoc,
1960 PrevSpec, DiagID, getLangOpts());
1962 assert(!Failed && "Making a constexpr member const shouldn't fail");
1965 const char *PrevSpec;
1967 if (D.getMutableDeclSpec().SetStorageClassSpec(
1968 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID)) {
1969 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable &&
1970 "This is the only DeclSpec that should fail to be applied");
1973 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static ");
1974 isInstField = false;
1981 CXXScopeSpec &SS = D.getCXXScopeSpec();
1983 // Data members must have identifiers for names.
1984 if (!Name.isIdentifier()) {
1985 Diag(Loc, diag::err_bad_variable_name)
1990 IdentifierInfo *II = Name.getAsIdentifierInfo();
1992 // Member field could not be with "template" keyword.
1993 // So TemplateParameterLists should be empty in this case.
1994 if (TemplateParameterLists.size()) {
1995 TemplateParameterList* TemplateParams = TemplateParameterLists[0];
1996 if (TemplateParams->size()) {
1997 // There is no such thing as a member field template.
1998 Diag(D.getIdentifierLoc(), diag::err_template_member)
2000 << SourceRange(TemplateParams->getTemplateLoc(),
2001 TemplateParams->getRAngleLoc());
2003 // There is an extraneous 'template<>' for this member.
2004 Diag(TemplateParams->getTemplateLoc(),
2005 diag::err_template_member_noparams)
2007 << SourceRange(TemplateParams->getTemplateLoc(),
2008 TemplateParams->getRAngleLoc());
2013 if (SS.isSet() && !SS.isInvalid()) {
2014 // The user provided a superfluous scope specifier inside a class
2020 if (DeclContext *DC = computeDeclContext(SS, false))
2021 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc());
2023 Diag(D.getIdentifierLoc(), diag::err_member_qualification)
2024 << Name << SS.getRange();
2029 AttributeList *MSPropertyAttr =
2030 getMSPropertyAttr(D.getDeclSpec().getAttributes().getList());
2031 if (MSPropertyAttr) {
2032 Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D,
2033 BitWidth, InitStyle, AS, MSPropertyAttr);
2036 isInstField = false;
2038 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D,
2039 BitWidth, InitStyle, AS);
2040 assert(Member && "HandleField never returns null");
2043 assert(InitStyle == ICIS_NoInit || D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static);
2045 Member = HandleDeclarator(S, D, TemplateParameterLists);
2049 // Non-instance-fields can't have a bitfield.
2051 if (Member->isInvalidDecl()) {
2052 // don't emit another diagnostic.
2053 } else if (isa<VarDecl>(Member)) {
2054 // C++ 9.6p3: A bit-field shall not be a static member.
2055 // "static member 'A' cannot be a bit-field"
2056 Diag(Loc, diag::err_static_not_bitfield)
2057 << Name << BitWidth->getSourceRange();
2058 } else if (isa<TypedefDecl>(Member)) {
2059 // "typedef member 'x' cannot be a bit-field"
2060 Diag(Loc, diag::err_typedef_not_bitfield)
2061 << Name << BitWidth->getSourceRange();
2063 // A function typedef ("typedef int f(); f a;").
2064 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
2065 Diag(Loc, diag::err_not_integral_type_bitfield)
2066 << Name << cast<ValueDecl>(Member)->getType()
2067 << BitWidth->getSourceRange();
2071 Member->setInvalidDecl();
2074 Member->setAccess(AS);
2076 // If we have declared a member function template or static data member
2077 // template, set the access of the templated declaration as well.
2078 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member))
2079 FunTmpl->getTemplatedDecl()->setAccess(AS);
2080 else if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(Member))
2081 VarTmpl->getTemplatedDecl()->setAccess(AS);
2084 if (VS.isOverrideSpecified())
2085 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context));
2086 if (VS.isFinalSpecified())
2087 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context,
2088 VS.isFinalSpelledSealed()));
2090 if (VS.getLastLocation().isValid()) {
2091 // Update the end location of a method that has a virt-specifiers.
2092 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member))
2093 MD->setRangeEnd(VS.getLastLocation());
2096 CheckOverrideControl(Member);
2098 assert((Name || isInstField) && "No identifier for non-field ?");
2101 FieldDecl *FD = cast<FieldDecl>(Member);
2102 FieldCollector->Add(FD);
2104 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field,
2106 != DiagnosticsEngine::Ignored) {
2107 // Remember all explicit private FieldDecls that have a name, no side
2108 // effects and are not part of a dependent type declaration.
2109 if (!FD->isImplicit() && FD->getDeclName() &&
2110 FD->getAccess() == AS_private &&
2111 !FD->hasAttr<UnusedAttr>() &&
2112 !FD->getParent()->isDependentContext() &&
2113 !InitializationHasSideEffects(*FD))
2114 UnusedPrivateFields.insert(FD);
2122 class UninitializedFieldVisitor
2123 : public EvaluatedExprVisitor<UninitializedFieldVisitor> {
2125 // List of Decls to generate a warning on. Also remove Decls that become
2127 llvm::SmallPtrSet<ValueDecl*, 4> &Decls;
2128 // If non-null, add a note to the warning pointing back to the constructor.
2129 const CXXConstructorDecl *Constructor;
2131 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited;
2132 UninitializedFieldVisitor(Sema &S,
2133 llvm::SmallPtrSet<ValueDecl*, 4> &Decls,
2134 const CXXConstructorDecl *Constructor)
2135 : Inherited(S.Context), S(S), Decls(Decls),
2136 Constructor(Constructor) { }
2138 void HandleMemberExpr(MemberExpr *ME, bool CheckReferenceOnly) {
2139 if (isa<EnumConstantDecl>(ME->getMemberDecl()))
2142 // FieldME is the inner-most MemberExpr that is not an anonymous struct
2144 MemberExpr *FieldME = ME;
2147 while (isa<MemberExpr>(Base)) {
2148 ME = cast<MemberExpr>(Base);
2150 if (isa<VarDecl>(ME->getMemberDecl()))
2153 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()))
2154 if (!FD->isAnonymousStructOrUnion())
2157 Base = ME->getBase();
2160 if (!isa<CXXThisExpr>(Base))
2163 ValueDecl* FoundVD = FieldME->getMemberDecl();
2165 if (!Decls.count(FoundVD))
2168 const bool IsReference = FoundVD->getType()->isReferenceType();
2170 // Prevent double warnings on use of unbounded references.
2171 if (IsReference != CheckReferenceOnly)
2174 unsigned diag = IsReference
2175 ? diag::warn_reference_field_is_uninit
2176 : diag::warn_field_is_uninit;
2177 S.Diag(FieldME->getExprLoc(), diag) << FoundVD;
2179 S.Diag(Constructor->getLocation(),
2180 diag::note_uninit_in_this_constructor)
2181 << (Constructor->isDefaultConstructor() && Constructor->isImplicit());
2185 void HandleValue(Expr *E) {
2186 E = E->IgnoreParens();
2188 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
2189 HandleMemberExpr(ME, false /*CheckReferenceOnly*/);
2193 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
2194 HandleValue(CO->getTrueExpr());
2195 HandleValue(CO->getFalseExpr());
2199 if (BinaryConditionalOperator *BCO =
2200 dyn_cast<BinaryConditionalOperator>(E)) {
2201 HandleValue(BCO->getCommon());
2202 HandleValue(BCO->getFalseExpr());
2206 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
2207 switch (BO->getOpcode()) {
2212 HandleValue(BO->getLHS());
2215 HandleValue(BO->getRHS());
2221 void VisitMemberExpr(MemberExpr *ME) {
2222 // All uses of unbounded reference fields will warn.
2223 HandleMemberExpr(ME, true /*CheckReferenceOnly*/);
2225 Inherited::VisitMemberExpr(ME);
2228 void VisitImplicitCastExpr(ImplicitCastExpr *E) {
2229 if (E->getCastKind() == CK_LValueToRValue)
2230 HandleValue(E->getSubExpr());
2232 Inherited::VisitImplicitCastExpr(E);
2235 void VisitCXXConstructExpr(CXXConstructExpr *E) {
2236 if (E->getConstructor()->isCopyConstructor())
2237 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(E->getArg(0)))
2238 if (ICE->getCastKind() == CK_NoOp)
2239 if (MemberExpr *ME = dyn_cast<MemberExpr>(ICE->getSubExpr()))
2240 HandleMemberExpr(ME, false /*CheckReferenceOnly*/);
2242 Inherited::VisitCXXConstructExpr(E);
2245 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
2246 Expr *Callee = E->getCallee();
2247 if (isa<MemberExpr>(Callee))
2248 HandleValue(Callee);
2250 Inherited::VisitCXXMemberCallExpr(E);
2253 void VisitBinaryOperator(BinaryOperator *E) {
2254 // If a field assignment is detected, remove the field from the
2255 // uninitiailized field set.
2256 if (E->getOpcode() == BO_Assign)
2257 if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getLHS()))
2258 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()))
2259 if (!FD->getType()->isReferenceType())
2262 Inherited::VisitBinaryOperator(E);
2265 static void CheckInitExprContainsUninitializedFields(
2266 Sema &S, Expr *E, llvm::SmallPtrSet<ValueDecl*, 4> &Decls,
2267 const CXXConstructorDecl *Constructor) {
2268 if (Decls.size() == 0)
2274 if (CXXDefaultInitExpr *Default = dyn_cast<CXXDefaultInitExpr>(E)) {
2275 E = Default->getExpr();
2278 // In class initializers will point to the constructor.
2279 UninitializedFieldVisitor(S, Decls, Constructor).Visit(E);
2281 UninitializedFieldVisitor(S, Decls, 0).Visit(E);
2285 // Diagnose value-uses of fields to initialize themselves, e.g.
2287 // where foo is not also a parameter to the constructor.
2288 // Also diagnose across field uninitialized use such as
2290 // TODO: implement -Wuninitialized and fold this into that framework.
2291 static void DiagnoseUninitializedFields(
2292 Sema &SemaRef, const CXXConstructorDecl *Constructor) {
2294 if (SemaRef.getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit,
2295 Constructor->getLocation())
2296 == DiagnosticsEngine::Ignored) {
2300 if (Constructor->isInvalidDecl())
2303 const CXXRecordDecl *RD = Constructor->getParent();
2305 // Holds fields that are uninitialized.
2306 llvm::SmallPtrSet<ValueDecl*, 4> UninitializedFields;
2308 // At the beginning, all fields are uninitialized.
2309 for (DeclContext::decl_iterator I = RD->decls_begin(), E = RD->decls_end();
2311 if (FieldDecl *FD = dyn_cast<FieldDecl>(*I)) {
2312 UninitializedFields.insert(FD);
2313 } else if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*I)) {
2314 UninitializedFields.insert(IFD->getAnonField());
2318 for (CXXConstructorDecl::init_const_iterator FieldInit =
2319 Constructor->init_begin(),
2320 FieldInitEnd = Constructor->init_end();
2321 FieldInit != FieldInitEnd; ++FieldInit) {
2323 Expr *InitExpr = (*FieldInit)->getInit();
2325 CheckInitExprContainsUninitializedFields(
2326 SemaRef, InitExpr, UninitializedFields, Constructor);
2328 if (FieldDecl *Field = (*FieldInit)->getAnyMember())
2329 UninitializedFields.erase(Field);
2334 /// ActOnCXXInClassMemberInitializer - This is invoked after parsing an
2335 /// in-class initializer for a non-static C++ class member, and after
2336 /// instantiating an in-class initializer in a class template. Such actions
2337 /// are deferred until the class is complete.
2339 Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc,
2341 FieldDecl *FD = cast<FieldDecl>(D);
2342 assert(FD->getInClassInitStyle() != ICIS_NoInit &&
2343 "must set init style when field is created");
2346 FD->setInvalidDecl();
2347 FD->removeInClassInitializer();
2351 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) {
2352 FD->setInvalidDecl();
2353 FD->removeInClassInitializer();
2357 ExprResult Init = InitExpr;
2358 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) {
2359 InitializedEntity Entity = InitializedEntity::InitializeMember(FD);
2360 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit
2361 ? InitializationKind::CreateDirectList(InitExpr->getLocStart())
2362 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc);
2363 InitializationSequence Seq(*this, Entity, Kind, InitExpr);
2364 Init = Seq.Perform(*this, Entity, Kind, InitExpr);
2365 if (Init.isInvalid()) {
2366 FD->setInvalidDecl();
2371 // C++11 [class.base.init]p7:
2372 // The initialization of each base and member constitutes a
2374 Init = ActOnFinishFullExpr(Init.take(), InitLoc);
2375 if (Init.isInvalid()) {
2376 FD->setInvalidDecl();
2380 InitExpr = Init.release();
2382 FD->setInClassInitializer(InitExpr);
2385 /// \brief Find the direct and/or virtual base specifiers that
2386 /// correspond to the given base type, for use in base initialization
2387 /// within a constructor.
2388 static bool FindBaseInitializer(Sema &SemaRef,
2389 CXXRecordDecl *ClassDecl,
2391 const CXXBaseSpecifier *&DirectBaseSpec,
2392 const CXXBaseSpecifier *&VirtualBaseSpec) {
2393 // First, check for a direct base class.
2395 for (CXXRecordDecl::base_class_const_iterator Base
2396 = ClassDecl->bases_begin();
2397 Base != ClassDecl->bases_end(); ++Base) {
2398 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) {
2399 // We found a direct base of this type. That's what we're
2401 DirectBaseSpec = &*Base;
2406 // Check for a virtual base class.
2407 // FIXME: We might be able to short-circuit this if we know in advance that
2408 // there are no virtual bases.
2409 VirtualBaseSpec = 0;
2410 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) {
2411 // We haven't found a base yet; search the class hierarchy for a
2412 // virtual base class.
2413 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
2414 /*DetectVirtual=*/false);
2415 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl),
2417 for (CXXBasePaths::paths_iterator Path = Paths.begin();
2418 Path != Paths.end(); ++Path) {
2419 if (Path->back().Base->isVirtual()) {
2420 VirtualBaseSpec = Path->back().Base;
2427 return DirectBaseSpec || VirtualBaseSpec;
2430 /// \brief Handle a C++ member initializer using braced-init-list syntax.
2432 Sema::ActOnMemInitializer(Decl *ConstructorD,
2435 IdentifierInfo *MemberOrBase,
2436 ParsedType TemplateTypeTy,
2438 SourceLocation IdLoc,
2440 SourceLocation EllipsisLoc) {
2441 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
2442 DS, IdLoc, InitList,
2446 /// \brief Handle a C++ member initializer using parentheses syntax.
2448 Sema::ActOnMemInitializer(Decl *ConstructorD,
2451 IdentifierInfo *MemberOrBase,
2452 ParsedType TemplateTypeTy,
2454 SourceLocation IdLoc,
2455 SourceLocation LParenLoc,
2456 ArrayRef<Expr *> Args,
2457 SourceLocation RParenLoc,
2458 SourceLocation EllipsisLoc) {
2459 Expr *List = new (Context) ParenListExpr(Context, LParenLoc,
2461 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
2462 DS, IdLoc, List, EllipsisLoc);
2467 // Callback to only accept typo corrections that can be a valid C++ member
2468 // intializer: either a non-static field member or a base class.
2469 class MemInitializerValidatorCCC : public CorrectionCandidateCallback {
2471 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl)
2472 : ClassDecl(ClassDecl) {}
2474 bool ValidateCandidate(const TypoCorrection &candidate) LLVM_OVERRIDE {
2475 if (NamedDecl *ND = candidate.getCorrectionDecl()) {
2476 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND))
2477 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl);
2478 return isa<TypeDecl>(ND);
2484 CXXRecordDecl *ClassDecl;
2489 /// \brief Handle a C++ member initializer.
2491 Sema::BuildMemInitializer(Decl *ConstructorD,
2494 IdentifierInfo *MemberOrBase,
2495 ParsedType TemplateTypeTy,
2497 SourceLocation IdLoc,
2499 SourceLocation EllipsisLoc) {
2503 AdjustDeclIfTemplate(ConstructorD);
2505 CXXConstructorDecl *Constructor
2506 = dyn_cast<CXXConstructorDecl>(ConstructorD);
2508 // The user wrote a constructor initializer on a function that is
2509 // not a C++ constructor. Ignore the error for now, because we may
2510 // have more member initializers coming; we'll diagnose it just
2511 // once in ActOnMemInitializers.
2515 CXXRecordDecl *ClassDecl = Constructor->getParent();
2517 // C++ [class.base.init]p2:
2518 // Names in a mem-initializer-id are looked up in the scope of the
2519 // constructor's class and, if not found in that scope, are looked
2520 // up in the scope containing the constructor's definition.
2521 // [Note: if the constructor's class contains a member with the
2522 // same name as a direct or virtual base class of the class, a
2523 // mem-initializer-id naming the member or base class and composed
2524 // of a single identifier refers to the class member. A
2525 // mem-initializer-id for the hidden base class may be specified
2526 // using a qualified name. ]
2527 if (!SS.getScopeRep() && !TemplateTypeTy) {
2528 // Look for a member, first.
2529 DeclContext::lookup_result Result
2530 = ClassDecl->lookup(MemberOrBase);
2531 if (!Result.empty()) {
2533 if ((Member = dyn_cast<FieldDecl>(Result.front())) ||
2534 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) {
2535 if (EllipsisLoc.isValid())
2536 Diag(EllipsisLoc, diag::err_pack_expansion_member_init)
2538 << SourceRange(IdLoc, Init->getSourceRange().getEnd());
2540 return BuildMemberInitializer(Member, Init, IdLoc);
2544 // It didn't name a member, so see if it names a class.
2546 TypeSourceInfo *TInfo = 0;
2548 if (TemplateTypeTy) {
2549 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo);
2550 } else if (DS.getTypeSpecType() == TST_decltype) {
2551 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc());
2553 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName);
2554 LookupParsedName(R, S, &SS);
2556 TypeDecl *TyD = R.getAsSingle<TypeDecl>();
2558 if (R.isAmbiguous()) return true;
2560 // We don't want access-control diagnostics here.
2561 R.suppressDiagnostics();
2563 if (SS.isSet() && isDependentScopeSpecifier(SS)) {
2564 bool NotUnknownSpecialization = false;
2565 DeclContext *DC = computeDeclContext(SS, false);
2566 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC))
2567 NotUnknownSpecialization = !Record->hasAnyDependentBases();
2569 if (!NotUnknownSpecialization) {
2570 // When the scope specifier can refer to a member of an unknown
2571 // specialization, we take it as a type name.
2572 BaseType = CheckTypenameType(ETK_None, SourceLocation(),
2573 SS.getWithLocInContext(Context),
2574 *MemberOrBase, IdLoc);
2575 if (BaseType.isNull())
2579 R.setLookupName(MemberOrBase);
2583 // If no results were found, try to correct typos.
2584 TypoCorrection Corr;
2585 MemInitializerValidatorCCC Validator(ClassDecl);
2586 if (R.empty() && BaseType.isNull() &&
2587 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS,
2588 Validator, ClassDecl))) {
2589 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) {
2590 // We have found a non-static data member with a similar
2591 // name to what was typed; complain and initialize that
2594 PDiag(diag::err_mem_init_not_member_or_class_suggest)
2595 << MemberOrBase << true);
2596 return BuildMemberInitializer(Member, Init, IdLoc);
2597 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) {
2598 const CXXBaseSpecifier *DirectBaseSpec;
2599 const CXXBaseSpecifier *VirtualBaseSpec;
2600 if (FindBaseInitializer(*this, ClassDecl,
2601 Context.getTypeDeclType(Type),
2602 DirectBaseSpec, VirtualBaseSpec)) {
2603 // We have found a direct or virtual base class with a
2604 // similar name to what was typed; complain and initialize
2607 PDiag(diag::err_mem_init_not_member_or_class_suggest)
2608 << MemberOrBase << false,
2609 PDiag() /*Suppress note, we provide our own.*/);
2611 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec ? DirectBaseSpec
2613 Diag(BaseSpec->getLocStart(),
2614 diag::note_base_class_specified_here)
2615 << BaseSpec->getType()
2616 << BaseSpec->getSourceRange();
2623 if (!TyD && BaseType.isNull()) {
2624 Diag(IdLoc, diag::err_mem_init_not_member_or_class)
2625 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd());
2630 if (BaseType.isNull()) {
2631 BaseType = Context.getTypeDeclType(TyD);
2633 NestedNameSpecifier *Qualifier =
2634 static_cast<NestedNameSpecifier*>(SS.getScopeRep());
2636 // FIXME: preserve source range information
2637 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType);
2643 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc);
2645 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc);
2648 /// Checks a member initializer expression for cases where reference (or
2649 /// pointer) members are bound to by-value parameters (or their addresses).
2650 static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member,
2652 SourceLocation IdLoc) {
2653 QualType MemberTy = Member->getType();
2655 // We only handle pointers and references currently.
2656 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers?
2657 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType())
2660 const bool IsPointer = MemberTy->isPointerType();
2662 if (const UnaryOperator *Op
2663 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) {
2664 // The only case we're worried about with pointers requires taking the
2666 if (Op->getOpcode() != UO_AddrOf)
2669 Init = Op->getSubExpr();
2671 // We only handle address-of expression initializers for pointers.
2676 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) {
2677 // We only warn when referring to a non-reference parameter declaration.
2678 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl());
2679 if (!Parameter || Parameter->getType()->isReferenceType())
2682 S.Diag(Init->getExprLoc(),
2683 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr
2684 : diag::warn_bind_ref_member_to_parameter)
2685 << Member << Parameter << Init->getSourceRange();
2687 // Other initializers are fine.
2691 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here)
2692 << (unsigned)IsPointer;
2696 Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init,
2697 SourceLocation IdLoc) {
2698 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member);
2699 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member);
2700 assert((DirectMember || IndirectMember) &&
2701 "Member must be a FieldDecl or IndirectFieldDecl");
2703 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
2706 if (Member->isInvalidDecl())
2710 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
2711 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
2712 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) {
2713 Args = MultiExprArg(InitList->getInits(), InitList->getNumInits());
2715 // Template instantiation doesn't reconstruct ParenListExprs for us.
2719 SourceRange InitRange = Init->getSourceRange();
2721 if (Member->getType()->isDependentType() || Init->isTypeDependent()) {
2722 // Can't check initialization for a member of dependent type or when
2723 // any of the arguments are type-dependent expressions.
2724 DiscardCleanupsInEvaluationContext();
2726 bool InitList = false;
2727 if (isa<InitListExpr>(Init)) {
2732 // Initialize the member.
2733 InitializedEntity MemberEntity =
2734 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0)
2735 : InitializedEntity::InitializeMember(IndirectMember, 0);
2736 InitializationKind Kind =
2737 InitList ? InitializationKind::CreateDirectList(IdLoc)
2738 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(),
2739 InitRange.getEnd());
2741 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args);
2742 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args, 0);
2743 if (MemberInit.isInvalid())
2746 CheckForDanglingReferenceOrPointer(*this, Member, MemberInit.get(), IdLoc);
2748 // C++11 [class.base.init]p7:
2749 // The initialization of each base and member constitutes a
2751 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin());
2752 if (MemberInit.isInvalid())
2755 Init = MemberInit.get();
2759 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc,
2760 InitRange.getBegin(), Init,
2761 InitRange.getEnd());
2763 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc,
2764 InitRange.getBegin(), Init,
2765 InitRange.getEnd());
2770 Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init,
2771 CXXRecordDecl *ClassDecl) {
2772 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin();
2773 if (!LangOpts.CPlusPlus11)
2774 return Diag(NameLoc, diag::err_delegating_ctor)
2775 << TInfo->getTypeLoc().getLocalSourceRange();
2776 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor);
2778 bool InitList = true;
2779 MultiExprArg Args = Init;
2780 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
2782 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
2785 SourceRange InitRange = Init->getSourceRange();
2786 // Initialize the object.
2787 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation(
2788 QualType(ClassDecl->getTypeForDecl(), 0));
2789 InitializationKind Kind =
2790 InitList ? InitializationKind::CreateDirectList(NameLoc)
2791 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(),
2792 InitRange.getEnd());
2793 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args);
2794 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind,
2796 if (DelegationInit.isInvalid())
2799 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() &&
2800 "Delegating constructor with no target?");
2802 // C++11 [class.base.init]p7:
2803 // The initialization of each base and member constitutes a
2805 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(),
2806 InitRange.getBegin());
2807 if (DelegationInit.isInvalid())
2810 // If we are in a dependent context, template instantiation will
2811 // perform this type-checking again. Just save the arguments that we
2812 // received in a ParenListExpr.
2813 // FIXME: This isn't quite ideal, since our ASTs don't capture all
2814 // of the information that we have about the base
2815 // initializer. However, deconstructing the ASTs is a dicey process,
2816 // and this approach is far more likely to get the corner cases right.
2817 if (CurContext->isDependentContext())
2818 DelegationInit = Owned(Init);
2820 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(),
2821 DelegationInit.takeAs<Expr>(),
2822 InitRange.getEnd());
2826 Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo,
2827 Expr *Init, CXXRecordDecl *ClassDecl,
2828 SourceLocation EllipsisLoc) {
2829 SourceLocation BaseLoc
2830 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin();
2832 if (!BaseType->isDependentType() && !BaseType->isRecordType())
2833 return Diag(BaseLoc, diag::err_base_init_does_not_name_class)
2834 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
2836 // C++ [class.base.init]p2:
2837 // [...] Unless the mem-initializer-id names a nonstatic data
2838 // member of the constructor's class or a direct or virtual base
2839 // of that class, the mem-initializer is ill-formed. A
2840 // mem-initializer-list can initialize a base class using any
2841 // name that denotes that base class type.
2842 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent();
2844 SourceRange InitRange = Init->getSourceRange();
2845 if (EllipsisLoc.isValid()) {
2846 // This is a pack expansion.
2847 if (!BaseType->containsUnexpandedParameterPack()) {
2848 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
2849 << SourceRange(BaseLoc, InitRange.getEnd());
2851 EllipsisLoc = SourceLocation();
2854 // Check for any unexpanded parameter packs.
2855 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer))
2858 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
2862 // Check for direct and virtual base classes.
2863 const CXXBaseSpecifier *DirectBaseSpec = 0;
2864 const CXXBaseSpecifier *VirtualBaseSpec = 0;
2866 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0),
2868 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl);
2870 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec,
2873 // C++ [base.class.init]p2:
2874 // Unless the mem-initializer-id names a nonstatic data member of the
2875 // constructor's class or a direct or virtual base of that class, the
2876 // mem-initializer is ill-formed.
2877 if (!DirectBaseSpec && !VirtualBaseSpec) {
2878 // If the class has any dependent bases, then it's possible that
2879 // one of those types will resolve to the same type as
2880 // BaseType. Therefore, just treat this as a dependent base
2881 // class initialization. FIXME: Should we try to check the
2882 // initialization anyway? It seems odd.
2883 if (ClassDecl->hasAnyDependentBases())
2886 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual)
2887 << BaseType << Context.getTypeDeclType(ClassDecl)
2888 << BaseTInfo->getTypeLoc().getLocalSourceRange();
2893 DiscardCleanupsInEvaluationContext();
2895 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
2896 /*IsVirtual=*/false,
2897 InitRange.getBegin(), Init,
2898 InitRange.getEnd(), EllipsisLoc);
2901 // C++ [base.class.init]p2:
2902 // If a mem-initializer-id is ambiguous because it designates both
2903 // a direct non-virtual base class and an inherited virtual base
2904 // class, the mem-initializer is ill-formed.
2905 if (DirectBaseSpec && VirtualBaseSpec)
2906 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual)
2907 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
2909 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec;
2911 BaseSpec = VirtualBaseSpec;
2913 // Initialize the base.
2914 bool InitList = true;
2915 MultiExprArg Args = Init;
2916 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
2918 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
2921 InitializedEntity BaseEntity =
2922 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec);
2923 InitializationKind Kind =
2924 InitList ? InitializationKind::CreateDirectList(BaseLoc)
2925 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(),
2926 InitRange.getEnd());
2927 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args);
2928 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, 0);
2929 if (BaseInit.isInvalid())
2932 // C++11 [class.base.init]p7:
2933 // The initialization of each base and member constitutes a
2935 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin());
2936 if (BaseInit.isInvalid())
2939 // If we are in a dependent context, template instantiation will
2940 // perform this type-checking again. Just save the arguments that we
2941 // received in a ParenListExpr.
2942 // FIXME: This isn't quite ideal, since our ASTs don't capture all
2943 // of the information that we have about the base
2944 // initializer. However, deconstructing the ASTs is a dicey process,
2945 // and this approach is far more likely to get the corner cases right.
2946 if (CurContext->isDependentContext())
2947 BaseInit = Owned(Init);
2949 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
2950 BaseSpec->isVirtual(),
2951 InitRange.getBegin(),
2952 BaseInit.takeAs<Expr>(),
2953 InitRange.getEnd(), EllipsisLoc);
2956 // Create a static_cast\<T&&>(expr).
2957 static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) {
2958 if (T.isNull()) T = E->getType();
2959 QualType TargetType = SemaRef.BuildReferenceType(
2960 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName());
2961 SourceLocation ExprLoc = E->getLocStart();
2962 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo(
2963 TargetType, ExprLoc);
2965 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E,
2966 SourceRange(ExprLoc, ExprLoc),
2967 E->getSourceRange()).take();
2970 /// ImplicitInitializerKind - How an implicit base or member initializer should
2971 /// initialize its base or member.
2972 enum ImplicitInitializerKind {
2980 BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
2981 ImplicitInitializerKind ImplicitInitKind,
2982 CXXBaseSpecifier *BaseSpec,
2983 bool IsInheritedVirtualBase,
2984 CXXCtorInitializer *&CXXBaseInit) {
2985 InitializedEntity InitEntity
2986 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec,
2987 IsInheritedVirtualBase);
2989 ExprResult BaseInit;
2991 switch (ImplicitInitKind) {
2993 const CXXRecordDecl *Inherited =
2994 Constructor->getInheritedConstructor()->getParent();
2995 const CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl();
2996 if (Base && Inherited->getCanonicalDecl() == Base->getCanonicalDecl()) {
2997 // C++11 [class.inhctor]p8:
2998 // Each expression in the expression-list is of the form
2999 // static_cast<T&&>(p), where p is the name of the corresponding
3000 // constructor parameter and T is the declared type of p.
3001 SmallVector<Expr*, 16> Args;
3002 for (unsigned I = 0, E = Constructor->getNumParams(); I != E; ++I) {
3003 ParmVarDecl *PD = Constructor->getParamDecl(I);
3004 ExprResult ArgExpr =
3005 SemaRef.BuildDeclRefExpr(PD, PD->getType().getNonReferenceType(),
3006 VK_LValue, SourceLocation());
3007 if (ArgExpr.isInvalid())
3009 Args.push_back(CastForMoving(SemaRef, ArgExpr.take(), PD->getType()));
3012 InitializationKind InitKind = InitializationKind::CreateDirect(
3013 Constructor->getLocation(), SourceLocation(), SourceLocation());
3014 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, Args);
3015 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, Args);
3021 InitializationKind InitKind
3022 = InitializationKind::CreateDefault(Constructor->getLocation());
3023 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None);
3024 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None);
3030 bool Moving = ImplicitInitKind == IIK_Move;
3031 ParmVarDecl *Param = Constructor->getParamDecl(0);
3032 QualType ParamType = Param->getType().getNonReferenceType();
3035 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
3036 SourceLocation(), Param, false,
3037 Constructor->getLocation(), ParamType,
3040 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg));
3042 // Cast to the base class to avoid ambiguities.
3044 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(),
3045 ParamType.getQualifiers());
3048 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg);
3051 CXXCastPath BasePath;
3052 BasePath.push_back(BaseSpec);
3053 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy,
3054 CK_UncheckedDerivedToBase,
3055 Moving ? VK_XValue : VK_LValue,
3058 InitializationKind InitKind
3059 = InitializationKind::CreateDirect(Constructor->getLocation(),
3060 SourceLocation(), SourceLocation());
3061 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg);
3062 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg);
3067 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit);
3068 if (BaseInit.isInvalid())
3072 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
3073 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(),
3075 BaseSpec->isVirtual(),
3077 BaseInit.takeAs<Expr>(),
3084 static bool RefersToRValueRef(Expr *MemRef) {
3085 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl();
3086 return Referenced->getType()->isRValueReferenceType();
3090 BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
3091 ImplicitInitializerKind ImplicitInitKind,
3092 FieldDecl *Field, IndirectFieldDecl *Indirect,
3093 CXXCtorInitializer *&CXXMemberInit) {
3094 if (Field->isInvalidDecl())
3097 SourceLocation Loc = Constructor->getLocation();
3099 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) {
3100 bool Moving = ImplicitInitKind == IIK_Move;
3101 ParmVarDecl *Param = Constructor->getParamDecl(0);
3102 QualType ParamType = Param->getType().getNonReferenceType();
3104 // Suppress copying zero-width bitfields.
3105 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0)
3108 Expr *MemberExprBase =
3109 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
3110 SourceLocation(), Param, false,
3111 Loc, ParamType, VK_LValue, 0);
3113 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase));
3116 MemberExprBase = CastForMoving(SemaRef, MemberExprBase);
3119 // Build a reference to this field within the parameter.
3121 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc,
3122 Sema::LookupMemberName);
3123 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect)
3124 : cast<ValueDecl>(Field), AS_public);
3125 MemberLookup.resolveKind();
3127 = SemaRef.BuildMemberReferenceExpr(MemberExprBase,
3131 /*TemplateKWLoc=*/SourceLocation(),
3132 /*FirstQualifierInScope=*/0,
3134 /*TemplateArgs=*/0);
3135 if (CtorArg.isInvalid())
3138 // C++11 [class.copy]p15:
3139 // - if a member m has rvalue reference type T&&, it is direct-initialized
3140 // with static_cast<T&&>(x.m);
3141 if (RefersToRValueRef(CtorArg.get())) {
3142 CtorArg = CastForMoving(SemaRef, CtorArg.take());
3145 // When the field we are copying is an array, create index variables for
3146 // each dimension of the array. We use these index variables to subscript
3147 // the source array, and other clients (e.g., CodeGen) will perform the
3148 // necessary iteration with these index variables.
3149 SmallVector<VarDecl *, 4> IndexVariables;
3150 QualType BaseType = Field->getType();
3151 QualType SizeType = SemaRef.Context.getSizeType();
3152 bool InitializingArray = false;
3153 while (const ConstantArrayType *Array
3154 = SemaRef.Context.getAsConstantArrayType(BaseType)) {
3155 InitializingArray = true;
3156 // Create the iteration variable for this array index.
3157 IdentifierInfo *IterationVarName = 0;
3160 llvm::raw_svector_ostream OS(Str);
3161 OS << "__i" << IndexVariables.size();
3162 IterationVarName = &SemaRef.Context.Idents.get(OS.str());
3164 VarDecl *IterationVar
3165 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc,
3166 IterationVarName, SizeType,
3167 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc),
3169 IndexVariables.push_back(IterationVar);
3171 // Create a reference to the iteration variable.
3172 ExprResult IterationVarRef
3173 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc);
3174 assert(!IterationVarRef.isInvalid() &&
3175 "Reference to invented variable cannot fail!");
3176 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take());
3177 assert(!IterationVarRef.isInvalid() &&
3178 "Conversion of invented variable cannot fail!");
3180 // Subscript the array with this iteration variable.
3181 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc,
3182 IterationVarRef.take(),
3184 if (CtorArg.isInvalid())
3187 BaseType = Array->getElementType();
3190 // The array subscript expression is an lvalue, which is wrong for moving.
3191 if (Moving && InitializingArray)
3192 CtorArg = CastForMoving(SemaRef, CtorArg.take());
3194 // Construct the entity that we will be initializing. For an array, this
3195 // will be first element in the array, which may require several levels
3196 // of array-subscript entities.
3197 SmallVector<InitializedEntity, 4> Entities;
3198 Entities.reserve(1 + IndexVariables.size());
3200 Entities.push_back(InitializedEntity::InitializeMember(Indirect));
3202 Entities.push_back(InitializedEntity::InitializeMember(Field));
3203 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I)
3204 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context,
3208 // Direct-initialize to use the copy constructor.
3209 InitializationKind InitKind =
3210 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation());
3212 Expr *CtorArgE = CtorArg.takeAs<Expr>();
3213 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, CtorArgE);
3215 ExprResult MemberInit
3216 = InitSeq.Perform(SemaRef, Entities.back(), InitKind,
3217 MultiExprArg(&CtorArgE, 1));
3218 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
3219 if (MemberInit.isInvalid())
3223 assert(IndexVariables.size() == 0 &&
3224 "Indirect field improperly initialized");
3226 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect,
3228 MemberInit.takeAs<Expr>(),
3231 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc,
3232 Loc, MemberInit.takeAs<Expr>(),
3234 IndexVariables.data(),
3235 IndexVariables.size());
3239 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) &&
3240 "Unhandled implicit init kind!");
3242 QualType FieldBaseElementType =
3243 SemaRef.Context.getBaseElementType(Field->getType());
3245 if (FieldBaseElementType->isRecordType()) {
3246 InitializedEntity InitEntity
3247 = Indirect? InitializedEntity::InitializeMember(Indirect)
3248 : InitializedEntity::InitializeMember(Field);
3249 InitializationKind InitKind =
3250 InitializationKind::CreateDefault(Loc);
3252 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None);
3253 ExprResult MemberInit =
3254 InitSeq.Perform(SemaRef, InitEntity, InitKind, None);
3256 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
3257 if (MemberInit.isInvalid())
3261 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
3267 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
3274 if (!Field->getParent()->isUnion()) {
3275 if (FieldBaseElementType->isReferenceType()) {
3276 SemaRef.Diag(Constructor->getLocation(),
3277 diag::err_uninitialized_member_in_ctor)
3278 << (int)Constructor->isImplicit()
3279 << SemaRef.Context.getTagDeclType(Constructor->getParent())
3280 << 0 << Field->getDeclName();
3281 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
3285 if (FieldBaseElementType.isConstQualified()) {
3286 SemaRef.Diag(Constructor->getLocation(),
3287 diag::err_uninitialized_member_in_ctor)
3288 << (int)Constructor->isImplicit()
3289 << SemaRef.Context.getTagDeclType(Constructor->getParent())
3290 << 1 << Field->getDeclName();
3291 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
3296 if (SemaRef.getLangOpts().ObjCAutoRefCount &&
3297 FieldBaseElementType->isObjCRetainableType() &&
3298 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None &&
3299 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) {
3301 // Default-initialize Objective-C pointers to NULL.
3303 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field,
3305 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()),
3310 // Nothing to initialize.
3316 struct BaseAndFieldInfo {
3318 CXXConstructorDecl *Ctor;
3319 bool AnyErrorsInInits;
3320 ImplicitInitializerKind IIK;
3321 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields;
3322 SmallVector<CXXCtorInitializer*, 8> AllToInit;
3324 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits)
3325 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) {
3326 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted();
3327 if (Generated && Ctor->isCopyConstructor())
3329 else if (Generated && Ctor->isMoveConstructor())
3331 else if (Ctor->getInheritedConstructor())
3337 bool isImplicitCopyOrMove() const {
3348 llvm_unreachable("Invalid ImplicitInitializerKind!");
3351 bool addFieldInitializer(CXXCtorInitializer *Init) {
3352 AllToInit.push_back(Init);
3354 // Check whether this initializer makes the field "used".
3355 if (Init->getInit()->HasSideEffects(S.Context))
3356 S.UnusedPrivateFields.remove(Init->getAnyMember());
3363 /// \brief Determine whether the given indirect field declaration is somewhere
3364 /// within an anonymous union.
3365 static bool isWithinAnonymousUnion(IndirectFieldDecl *F) {
3366 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(),
3367 CEnd = F->chain_end();
3369 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext()))
3370 if (Record->isUnion())
3376 /// \brief Determine whether the given type is an incomplete or zero-lenfgth
3378 static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) {
3379 if (T->isIncompleteArrayType())
3382 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) {
3383 if (!ArrayT->getSize())
3386 T = ArrayT->getElementType();
3392 static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info,
3394 IndirectFieldDecl *Indirect = 0) {
3395 if (Field->isInvalidDecl())
3398 // Overwhelmingly common case: we have a direct initializer for this field.
3399 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field))
3400 return Info.addFieldInitializer(Init);
3402 // C++11 [class.base.init]p8: if the entity is a non-static data member that
3403 // has a brace-or-equal-initializer, the entity is initialized as specified
3405 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) {
3406 Expr *DIE = CXXDefaultInitExpr::Create(SemaRef.Context,
3407 Info.Ctor->getLocation(), Field);
3408 CXXCtorInitializer *Init;
3410 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect,
3412 SourceLocation(), DIE,
3415 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field,
3417 SourceLocation(), DIE,
3419 return Info.addFieldInitializer(Init);
3422 // Don't build an implicit initializer for union members if none was
3423 // explicitly specified.
3424 if (Field->getParent()->isUnion() ||
3425 (Indirect && isWithinAnonymousUnion(Indirect)))
3428 // Don't initialize incomplete or zero-length arrays.
3429 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType()))
3432 // Don't try to build an implicit initializer if there were semantic
3433 // errors in any of the initializers (and therefore we might be
3434 // missing some that the user actually wrote).
3435 if (Info.AnyErrorsInInits)
3438 CXXCtorInitializer *Init = 0;
3439 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field,
3446 return Info.addFieldInitializer(Init);
3450 Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor,
3451 CXXCtorInitializer *Initializer) {
3452 assert(Initializer->isDelegatingInitializer());
3453 Constructor->setNumCtorInitializers(1);
3454 CXXCtorInitializer **initializer =
3455 new (Context) CXXCtorInitializer*[1];
3456 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*));
3457 Constructor->setCtorInitializers(initializer);
3459 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) {
3460 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor);
3461 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation());
3464 DelegatingCtorDecls.push_back(Constructor);
3469 bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors,
3470 ArrayRef<CXXCtorInitializer *> Initializers) {
3471 if (Constructor->isDependentContext()) {
3472 // Just store the initializers as written, they will be checked during
3474 if (!Initializers.empty()) {
3475 Constructor->setNumCtorInitializers(Initializers.size());
3476 CXXCtorInitializer **baseOrMemberInitializers =
3477 new (Context) CXXCtorInitializer*[Initializers.size()];
3478 memcpy(baseOrMemberInitializers, Initializers.data(),
3479 Initializers.size() * sizeof(CXXCtorInitializer*));
3480 Constructor->setCtorInitializers(baseOrMemberInitializers);
3483 // Let template instantiation know whether we had errors.
3485 Constructor->setInvalidDecl();
3490 BaseAndFieldInfo Info(*this, Constructor, AnyErrors);
3492 // We need to build the initializer AST according to order of construction
3493 // and not what user specified in the Initializers list.
3494 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition();
3498 bool HadError = false;
3500 for (unsigned i = 0; i < Initializers.size(); i++) {
3501 CXXCtorInitializer *Member = Initializers[i];
3503 if (Member->isBaseInitializer())
3504 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member;
3506 Info.AllBaseFields[Member->getAnyMember()] = Member;
3509 // Keep track of the direct virtual bases.
3510 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases;
3511 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(),
3512 E = ClassDecl->bases_end(); I != E; ++I) {
3514 DirectVBases.insert(I);
3517 // Push virtual bases before others.
3518 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(),
3519 E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
3521 if (CXXCtorInitializer *Value
3522 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) {
3523 // [class.base.init]p7, per DR257:
3524 // A mem-initializer where the mem-initializer-id names a virtual base
3525 // class is ignored during execution of a constructor of any class that
3526 // is not the most derived class.
3527 if (ClassDecl->isAbstract()) {
3528 // FIXME: Provide a fixit to remove the base specifier. This requires
3529 // tracking the location of the associated comma for a base specifier.
3530 Diag(Value->getSourceLocation(), diag::warn_abstract_vbase_init_ignored)
3531 << VBase->getType() << ClassDecl;
3532 DiagnoseAbstractType(ClassDecl);
3535 Info.AllToInit.push_back(Value);
3536 } else if (!AnyErrors && !ClassDecl->isAbstract()) {
3537 // [class.base.init]p8, per DR257:
3538 // If a given [...] base class is not named by a mem-initializer-id
3539 // [...] and the entity is not a virtual base class of an abstract
3540 // class, then [...] the entity is default-initialized.
3541 bool IsInheritedVirtualBase = !DirectVBases.count(VBase);
3542 CXXCtorInitializer *CXXBaseInit;
3543 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
3544 VBase, IsInheritedVirtualBase,
3550 Info.AllToInit.push_back(CXXBaseInit);
3554 // Non-virtual bases.
3555 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
3556 E = ClassDecl->bases_end(); Base != E; ++Base) {
3557 // Virtuals are in the virtual base list and already constructed.
3558 if (Base->isVirtual())
3561 if (CXXCtorInitializer *Value
3562 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) {
3563 Info.AllToInit.push_back(Value);
3564 } else if (!AnyErrors) {
3565 CXXCtorInitializer *CXXBaseInit;
3566 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
3567 Base, /*IsInheritedVirtualBase=*/false,
3573 Info.AllToInit.push_back(CXXBaseInit);
3578 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(),
3579 MemEnd = ClassDecl->decls_end();
3580 Mem != MemEnd; ++Mem) {
3581 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) {
3582 // C++ [class.bit]p2:
3583 // A declaration for a bit-field that omits the identifier declares an
3584 // unnamed bit-field. Unnamed bit-fields are not members and cannot be
3586 if (F->isUnnamedBitfield())
3589 // If we're not generating the implicit copy/move constructor, then we'll
3590 // handle anonymous struct/union fields based on their individual
3592 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove())
3595 if (CollectFieldInitializer(*this, Info, F))
3600 // Beyond this point, we only consider default initialization.
3601 if (Info.isImplicitCopyOrMove())
3604 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) {
3605 if (F->getType()->isIncompleteArrayType()) {
3606 assert(ClassDecl->hasFlexibleArrayMember() &&
3607 "Incomplete array type is not valid");
3611 // Initialize each field of an anonymous struct individually.
3612 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F))
3619 unsigned NumInitializers = Info.AllToInit.size();
3620 if (NumInitializers > 0) {
3621 Constructor->setNumCtorInitializers(NumInitializers);
3622 CXXCtorInitializer **baseOrMemberInitializers =
3623 new (Context) CXXCtorInitializer*[NumInitializers];
3624 memcpy(baseOrMemberInitializers, Info.AllToInit.data(),
3625 NumInitializers * sizeof(CXXCtorInitializer*));
3626 Constructor->setCtorInitializers(baseOrMemberInitializers);
3628 // Constructors implicitly reference the base and member
3630 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(),
3631 Constructor->getParent());
3637 static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) {
3638 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) {
3639 const RecordDecl *RD = RT->getDecl();
3640 if (RD->isAnonymousStructOrUnion()) {
3641 for (RecordDecl::field_iterator Field = RD->field_begin(),
3642 E = RD->field_end(); Field != E; ++Field)
3643 PopulateKeysForFields(*Field, IdealInits);
3647 IdealInits.push_back(Field);
3650 static const void *GetKeyForBase(ASTContext &Context, QualType BaseType) {
3651 return Context.getCanonicalType(BaseType).getTypePtr();
3654 static const void *GetKeyForMember(ASTContext &Context,
3655 CXXCtorInitializer *Member) {
3656 if (!Member->isAnyMemberInitializer())
3657 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0));
3659 return Member->getAnyMember();
3662 static void DiagnoseBaseOrMemInitializerOrder(
3663 Sema &SemaRef, const CXXConstructorDecl *Constructor,
3664 ArrayRef<CXXCtorInitializer *> Inits) {
3665 if (Constructor->getDeclContext()->isDependentContext())
3668 // Don't check initializers order unless the warning is enabled at the
3669 // location of at least one initializer.
3670 bool ShouldCheckOrder = false;
3671 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) {
3672 CXXCtorInitializer *Init = Inits[InitIndex];
3673 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order,
3674 Init->getSourceLocation())
3675 != DiagnosticsEngine::Ignored) {
3676 ShouldCheckOrder = true;
3680 if (!ShouldCheckOrder)
3683 // Build the list of bases and members in the order that they'll
3684 // actually be initialized. The explicit initializers should be in
3685 // this same order but may be missing things.
3686 SmallVector<const void*, 32> IdealInitKeys;
3688 const CXXRecordDecl *ClassDecl = Constructor->getParent();
3690 // 1. Virtual bases.
3691 for (CXXRecordDecl::base_class_const_iterator VBase =
3692 ClassDecl->vbases_begin(),
3693 E = ClassDecl->vbases_end(); VBase != E; ++VBase)
3694 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType()));
3696 // 2. Non-virtual bases.
3697 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(),
3698 E = ClassDecl->bases_end(); Base != E; ++Base) {
3699 if (Base->isVirtual())
3701 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType()));
3704 // 3. Direct fields.
3705 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
3706 E = ClassDecl->field_end(); Field != E; ++Field) {
3707 if (Field->isUnnamedBitfield())
3710 PopulateKeysForFields(*Field, IdealInitKeys);
3713 unsigned NumIdealInits = IdealInitKeys.size();
3714 unsigned IdealIndex = 0;
3716 CXXCtorInitializer *PrevInit = 0;
3717 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) {
3718 CXXCtorInitializer *Init = Inits[InitIndex];
3719 const void *InitKey = GetKeyForMember(SemaRef.Context, Init);
3721 // Scan forward to try to find this initializer in the idealized
3722 // initializers list.
3723 for (; IdealIndex != NumIdealInits; ++IdealIndex)
3724 if (InitKey == IdealInitKeys[IdealIndex])
3727 // If we didn't find this initializer, it must be because we
3728 // scanned past it on a previous iteration. That can only
3729 // happen if we're out of order; emit a warning.
3730 if (IdealIndex == NumIdealInits && PrevInit) {
3731 Sema::SemaDiagnosticBuilder D =
3732 SemaRef.Diag(PrevInit->getSourceLocation(),
3733 diag::warn_initializer_out_of_order);
3735 if (PrevInit->isAnyMemberInitializer())
3736 D << 0 << PrevInit->getAnyMember()->getDeclName();
3738 D << 1 << PrevInit->getTypeSourceInfo()->getType();
3740 if (Init->isAnyMemberInitializer())
3741 D << 0 << Init->getAnyMember()->getDeclName();
3743 D << 1 << Init->getTypeSourceInfo()->getType();
3745 // Move back to the initializer's location in the ideal list.
3746 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex)
3747 if (InitKey == IdealInitKeys[IdealIndex])
3750 assert(IdealIndex != NumIdealInits &&
3751 "initializer not found in initializer list");
3759 bool CheckRedundantInit(Sema &S,
3760 CXXCtorInitializer *Init,
3761 CXXCtorInitializer *&PrevInit) {
3767 if (FieldDecl *Field = Init->getAnyMember())
3768 S.Diag(Init->getSourceLocation(),
3769 diag::err_multiple_mem_initialization)
3770 << Field->getDeclName()
3771 << Init->getSourceRange();
3773 const Type *BaseClass = Init->getBaseClass();
3774 assert(BaseClass && "neither field nor base");
3775 S.Diag(Init->getSourceLocation(),
3776 diag::err_multiple_base_initialization)
3777 << QualType(BaseClass, 0)
3778 << Init->getSourceRange();
3780 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer)
3781 << 0 << PrevInit->getSourceRange();
3786 typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry;
3787 typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap;
3789 bool CheckRedundantUnionInit(Sema &S,
3790 CXXCtorInitializer *Init,
3791 RedundantUnionMap &Unions) {
3792 FieldDecl *Field = Init->getAnyMember();
3793 RecordDecl *Parent = Field->getParent();
3794 NamedDecl *Child = Field;
3796 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) {
3797 if (Parent->isUnion()) {
3798 UnionEntry &En = Unions[Parent];
3799 if (En.first && En.first != Child) {
3800 S.Diag(Init->getSourceLocation(),
3801 diag::err_multiple_mem_union_initialization)
3802 << Field->getDeclName()
3803 << Init->getSourceRange();
3804 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer)
3805 << 0 << En.second->getSourceRange();
3812 if (!Parent->isAnonymousStructOrUnion())
3817 Parent = cast<RecordDecl>(Parent->getDeclContext());
3824 /// ActOnMemInitializers - Handle the member initializers for a constructor.
3825 void Sema::ActOnMemInitializers(Decl *ConstructorDecl,
3826 SourceLocation ColonLoc,
3827 ArrayRef<CXXCtorInitializer*> MemInits,
3829 if (!ConstructorDecl)
3832 AdjustDeclIfTemplate(ConstructorDecl);
3834 CXXConstructorDecl *Constructor
3835 = dyn_cast<CXXConstructorDecl>(ConstructorDecl);
3838 Diag(ColonLoc, diag::err_only_constructors_take_base_inits);
3842 // Mapping for the duplicate initializers check.
3843 // For member initializers, this is keyed with a FieldDecl*.
3844 // For base initializers, this is keyed with a Type*.
3845 llvm::DenseMap<const void *, CXXCtorInitializer *> Members;
3847 // Mapping for the inconsistent anonymous-union initializers check.
3848 RedundantUnionMap MemberUnions;
3850 bool HadError = false;
3851 for (unsigned i = 0; i < MemInits.size(); i++) {
3852 CXXCtorInitializer *Init = MemInits[i];
3854 // Set the source order index.
3855 Init->setSourceOrder(i);
3857 if (Init->isAnyMemberInitializer()) {
3858 FieldDecl *Field = Init->getAnyMember();
3859 if (CheckRedundantInit(*this, Init, Members[Field]) ||
3860 CheckRedundantUnionInit(*this, Init, MemberUnions))
3862 } else if (Init->isBaseInitializer()) {
3864 GetKeyForBase(Context, QualType(Init->getBaseClass(), 0));
3865 if (CheckRedundantInit(*this, Init, Members[Key]))
3868 assert(Init->isDelegatingInitializer());
3869 // This must be the only initializer
3870 if (MemInits.size() != 1) {
3871 Diag(Init->getSourceLocation(),
3872 diag::err_delegating_initializer_alone)
3873 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange();
3874 // We will treat this as being the only initializer.
3876 SetDelegatingInitializer(Constructor, MemInits[i]);
3877 // Return immediately as the initializer is set.
3885 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits);
3887 SetCtorInitializers(Constructor, AnyErrors, MemInits);
3889 DiagnoseUninitializedFields(*this, Constructor);
3893 Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location,
3894 CXXRecordDecl *ClassDecl) {
3895 // Ignore dependent contexts. Also ignore unions, since their members never
3896 // have destructors implicitly called.
3897 if (ClassDecl->isDependentContext() || ClassDecl->isUnion())
3900 // FIXME: all the access-control diagnostics are positioned on the
3901 // field/base declaration. That's probably good; that said, the
3902 // user might reasonably want to know why the destructor is being
3903 // emitted, and we currently don't say.
3905 // Non-static data members.
3906 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(),
3907 E = ClassDecl->field_end(); I != E; ++I) {
3908 FieldDecl *Field = *I;
3909 if (Field->isInvalidDecl())
3912 // Don't destroy incomplete or zero-length arrays.
3913 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType()))
3916 QualType FieldType = Context.getBaseElementType(Field->getType());
3918 const RecordType* RT = FieldType->getAs<RecordType>();
3922 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
3923 if (FieldClassDecl->isInvalidDecl())
3925 if (FieldClassDecl->hasIrrelevantDestructor())
3927 // The destructor for an implicit anonymous union member is never invoked.
3928 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion())
3931 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl);
3932 assert(Dtor && "No dtor found for FieldClassDecl!");
3933 CheckDestructorAccess(Field->getLocation(), Dtor,
3934 PDiag(diag::err_access_dtor_field)
3935 << Field->getDeclName()
3938 MarkFunctionReferenced(Location, Dtor);
3939 DiagnoseUseOfDecl(Dtor, Location);
3942 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases;
3945 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
3946 E = ClassDecl->bases_end(); Base != E; ++Base) {
3947 // Bases are always records in a well-formed non-dependent class.
3948 const RecordType *RT = Base->getType()->getAs<RecordType>();
3950 // Remember direct virtual bases.
3951 if (Base->isVirtual())
3952 DirectVirtualBases.insert(RT);
3954 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
3955 // If our base class is invalid, we probably can't get its dtor anyway.
3956 if (BaseClassDecl->isInvalidDecl())
3958 if (BaseClassDecl->hasIrrelevantDestructor())
3961 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
3962 assert(Dtor && "No dtor found for BaseClassDecl!");
3964 // FIXME: caret should be on the start of the class name
3965 CheckDestructorAccess(Base->getLocStart(), Dtor,
3966 PDiag(diag::err_access_dtor_base)
3968 << Base->getSourceRange(),
3969 Context.getTypeDeclType(ClassDecl));
3971 MarkFunctionReferenced(Location, Dtor);
3972 DiagnoseUseOfDecl(Dtor, Location);
3976 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(),
3977 E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
3979 // Bases are always records in a well-formed non-dependent class.
3980 const RecordType *RT = VBase->getType()->castAs<RecordType>();
3982 // Ignore direct virtual bases.
3983 if (DirectVirtualBases.count(RT))
3986 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
3987 // If our base class is invalid, we probably can't get its dtor anyway.
3988 if (BaseClassDecl->isInvalidDecl())
3990 if (BaseClassDecl->hasIrrelevantDestructor())
3993 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
3994 assert(Dtor && "No dtor found for BaseClassDecl!");
3995 if (CheckDestructorAccess(
3996 ClassDecl->getLocation(), Dtor,
3997 PDiag(diag::err_access_dtor_vbase)
3998 << Context.getTypeDeclType(ClassDecl) << VBase->getType(),
3999 Context.getTypeDeclType(ClassDecl)) ==
4001 CheckDerivedToBaseConversion(
4002 Context.getTypeDeclType(ClassDecl), VBase->getType(),
4003 diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(),
4004 SourceRange(), DeclarationName(), 0);
4007 MarkFunctionReferenced(Location, Dtor);
4008 DiagnoseUseOfDecl(Dtor, Location);
4012 void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) {
4016 if (CXXConstructorDecl *Constructor
4017 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) {
4018 SetCtorInitializers(Constructor, /*AnyErrors=*/false);
4019 DiagnoseUninitializedFields(*this, Constructor);
4023 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
4024 unsigned DiagID, AbstractDiagSelID SelID) {
4025 class NonAbstractTypeDiagnoser : public TypeDiagnoser {
4027 AbstractDiagSelID SelID;
4030 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID)
4031 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { }
4033 void diagnose(Sema &S, SourceLocation Loc, QualType T) LLVM_OVERRIDE {
4034 if (Suppressed) return;
4036 S.Diag(Loc, DiagID) << T;
4038 S.Diag(Loc, DiagID) << SelID << T;
4040 } Diagnoser(DiagID, SelID);
4042 return RequireNonAbstractType(Loc, T, Diagnoser);
4045 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
4046 TypeDiagnoser &Diagnoser) {
4047 if (!getLangOpts().CPlusPlus)
4050 if (const ArrayType *AT = Context.getAsArrayType(T))
4051 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser);
4053 if (const PointerType *PT = T->getAs<PointerType>()) {
4054 // Find the innermost pointer type.
4055 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>())
4058 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType()))
4059 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser);
4062 const RecordType *RT = T->getAs<RecordType>();
4066 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
4068 // We can't answer whether something is abstract until it has a
4069 // definition. If it's currently being defined, we'll walk back
4070 // over all the declarations when we have a full definition.
4071 const CXXRecordDecl *Def = RD->getDefinition();
4072 if (!Def || Def->isBeingDefined())
4075 if (!RD->isAbstract())
4078 Diagnoser.diagnose(*this, Loc, T);
4079 DiagnoseAbstractType(RD);
4084 void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) {
4085 // Check if we've already emitted the list of pure virtual functions
4087 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD))
4090 // If the diagnostic is suppressed, don't emit the notes. We're only
4091 // going to emit them once, so try to attach them to a diagnostic we're
4092 // actually going to show.
4093 if (Diags.isLastDiagnosticIgnored())
4096 CXXFinalOverriderMap FinalOverriders;
4097 RD->getFinalOverriders(FinalOverriders);
4099 // Keep a set of seen pure methods so we won't diagnose the same method
4101 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods;
4103 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
4104 MEnd = FinalOverriders.end();
4107 for (OverridingMethods::iterator SO = M->second.begin(),
4108 SOEnd = M->second.end();
4109 SO != SOEnd; ++SO) {
4110 // C++ [class.abstract]p4:
4111 // A class is abstract if it contains or inherits at least one
4112 // pure virtual function for which the final overrider is pure
4116 if (SO->second.size() != 1)
4119 if (!SO->second.front().Method->isPure())
4122 if (!SeenPureMethods.insert(SO->second.front().Method))
4125 Diag(SO->second.front().Method->getLocation(),
4126 diag::note_pure_virtual_function)
4127 << SO->second.front().Method->getDeclName() << RD->getDeclName();
4131 if (!PureVirtualClassDiagSet)
4132 PureVirtualClassDiagSet.reset(new RecordDeclSetTy);
4133 PureVirtualClassDiagSet->insert(RD);
4137 struct AbstractUsageInfo {
4139 CXXRecordDecl *Record;
4140 CanQualType AbstractType;
4143 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record)
4144 : S(S), Record(Record),
4145 AbstractType(S.Context.getCanonicalType(
4146 S.Context.getTypeDeclType(Record))),
4149 void DiagnoseAbstractType() {
4150 if (Invalid) return;
4151 S.DiagnoseAbstractType(Record);
4155 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel);
4158 struct CheckAbstractUsage {
4159 AbstractUsageInfo &Info;
4160 const NamedDecl *Ctx;
4162 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx)
4163 : Info(Info), Ctx(Ctx) {}
4165 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
4166 switch (TL.getTypeLocClass()) {
4167 #define ABSTRACT_TYPELOC(CLASS, PARENT)
4168 #define TYPELOC(CLASS, PARENT) \
4169 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break;
4170 #include "clang/AST/TypeLocNodes.def"
4174 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) {
4175 Visit(TL.getResultLoc(), Sema::AbstractReturnType);
4176 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
4180 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo();
4181 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType);
4185 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) {
4186 Visit(TL.getElementLoc(), Sema::AbstractArrayType);
4189 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) {
4190 // Visit the type parameters from a permissive context.
4191 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
4192 TemplateArgumentLoc TAL = TL.getArgLoc(I);
4193 if (TAL.getArgument().getKind() == TemplateArgument::Type)
4194 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo())
4195 Visit(TSI->getTypeLoc(), Sema::AbstractNone);
4196 // TODO: other template argument types?
4200 // Visit pointee types from a permissive context.
4201 #define CheckPolymorphic(Type) \
4202 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \
4203 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \
4205 CheckPolymorphic(PointerTypeLoc)
4206 CheckPolymorphic(ReferenceTypeLoc)
4207 CheckPolymorphic(MemberPointerTypeLoc)
4208 CheckPolymorphic(BlockPointerTypeLoc)
4209 CheckPolymorphic(AtomicTypeLoc)
4211 /// Handle all the types we haven't given a more specific
4212 /// implementation for above.
4213 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
4214 // Every other kind of type that we haven't called out already
4215 // that has an inner type is either (1) sugar or (2) contains that
4216 // inner type in some way as a subobject.
4217 if (TypeLoc Next = TL.getNextTypeLoc())
4218 return Visit(Next, Sel);
4220 // If there's no inner type and we're in a permissive context,
4222 if (Sel == Sema::AbstractNone) return;
4224 // Check whether the type matches the abstract type.
4225 QualType T = TL.getType();
4226 if (T->isArrayType()) {
4227 Sel = Sema::AbstractArrayType;
4228 T = Info.S.Context.getBaseElementType(T);
4230 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType();
4231 if (CT != Info.AbstractType) return;
4233 // It matched; do some magic.
4234 if (Sel == Sema::AbstractArrayType) {
4235 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type)
4236 << T << TL.getSourceRange();
4238 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl)
4239 << Sel << T << TL.getSourceRange();
4241 Info.DiagnoseAbstractType();
4245 void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL,
4246 Sema::AbstractDiagSelID Sel) {
4247 CheckAbstractUsage(*this, D).Visit(TL, Sel);
4252 /// Check for invalid uses of an abstract type in a method declaration.
4253 static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
4254 CXXMethodDecl *MD) {
4255 // No need to do the check on definitions, which require that
4256 // the return/param types be complete.
4257 if (MD->doesThisDeclarationHaveABody())
4260 // For safety's sake, just ignore it if we don't have type source
4261 // information. This should never happen for non-implicit methods,
4263 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
4264 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone);
4267 /// Check for invalid uses of an abstract type within a class definition.
4268 static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
4269 CXXRecordDecl *RD) {
4270 for (CXXRecordDecl::decl_iterator
4271 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) {
4273 if (D->isImplicit()) continue;
4275 // Methods and method templates.
4276 if (isa<CXXMethodDecl>(D)) {
4277 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D));
4278 } else if (isa<FunctionTemplateDecl>(D)) {
4279 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl();
4280 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD));
4282 // Fields and static variables.
4283 } else if (isa<FieldDecl>(D)) {
4284 FieldDecl *FD = cast<FieldDecl>(D);
4285 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo())
4286 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType);
4287 } else if (isa<VarDecl>(D)) {
4288 VarDecl *VD = cast<VarDecl>(D);
4289 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo())
4290 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType);
4292 // Nested classes and class templates.
4293 } else if (isa<CXXRecordDecl>(D)) {
4294 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D));
4295 } else if (isa<ClassTemplateDecl>(D)) {
4296 CheckAbstractClassUsage(Info,
4297 cast<ClassTemplateDecl>(D)->getTemplatedDecl());
4302 /// \brief Perform semantic checks on a class definition that has been
4303 /// completing, introducing implicitly-declared members, checking for
4304 /// abstract types, etc.
4305 void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) {
4309 if (Record->isAbstract() && !Record->isInvalidDecl()) {
4310 AbstractUsageInfo Info(*this, Record);
4311 CheckAbstractClassUsage(Info, Record);
4314 // If this is not an aggregate type and has no user-declared constructor,
4315 // complain about any non-static data members of reference or const scalar
4316 // type, since they will never get initializers.
4317 if (!Record->isInvalidDecl() && !Record->isDependentType() &&
4318 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() &&
4319 !Record->isLambda()) {
4320 bool Complained = false;
4321 for (RecordDecl::field_iterator F = Record->field_begin(),
4322 FEnd = Record->field_end();
4324 if (F->hasInClassInitializer() || F->isUnnamedBitfield())
4327 if (F->getType()->isReferenceType() ||
4328 (F->getType().isConstQualified() && F->getType()->isScalarType())) {
4330 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst)
4331 << Record->getTagKind() << Record;
4335 Diag(F->getLocation(), diag::note_refconst_member_not_initialized)
4336 << F->getType()->isReferenceType()
4337 << F->getDeclName();
4342 if (Record->isDynamicClass() && !Record->isDependentType())
4343 DynamicClasses.push_back(Record);
4345 if (Record->getIdentifier()) {
4346 // C++ [class.mem]p13:
4347 // If T is the name of a class, then each of the following shall have a
4348 // name different from T:
4349 // - every member of every anonymous union that is a member of class T.
4351 // C++ [class.mem]p14:
4352 // In addition, if class T has a user-declared constructor (12.1), every
4353 // non-static data member of class T shall have a name different from T.
4354 DeclContext::lookup_result R = Record->lookup(Record->getDeclName());
4355 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E;
4358 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) ||
4359 isa<IndirectFieldDecl>(D)) {
4360 Diag(D->getLocation(), diag::err_member_name_of_class)
4361 << D->getDeclName();
4367 // Warn if the class has virtual methods but non-virtual public destructor.
4368 if (Record->isPolymorphic() && !Record->isDependentType()) {
4369 CXXDestructorDecl *dtor = Record->getDestructor();
4370 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public))
4371 Diag(dtor ? dtor->getLocation() : Record->getLocation(),
4372 diag::warn_non_virtual_dtor) << Context.getRecordType(Record);
4375 if (Record->isAbstract()) {
4376 if (FinalAttr *FA = Record->getAttr<FinalAttr>()) {
4377 Diag(Record->getLocation(), diag::warn_abstract_final_class)
4378 << FA->isSpelledAsSealed();
4379 DiagnoseAbstractType(Record);
4383 if (!Record->isDependentType()) {
4384 for (CXXRecordDecl::method_iterator M = Record->method_begin(),
4385 MEnd = Record->method_end();
4387 // See if a method overloads virtual methods in a base
4388 // class without overriding any.
4390 DiagnoseHiddenVirtualMethods(*M);
4392 // Check whether the explicitly-defaulted special members are valid.
4393 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted())
4394 CheckExplicitlyDefaultedSpecialMember(*M);
4396 // For an explicitly defaulted or deleted special member, we defer
4397 // determining triviality until the class is complete. That time is now!
4398 if (!M->isImplicit() && !M->isUserProvided()) {
4399 CXXSpecialMember CSM = getSpecialMember(*M);
4400 if (CSM != CXXInvalid) {
4401 M->setTrivial(SpecialMemberIsTrivial(*M, CSM));
4403 // Inform the class that we've finished declaring this member.
4404 Record->finishedDefaultedOrDeletedMember(*M);
4410 // C++11 [dcl.constexpr]p8: A constexpr specifier for a non-static member
4411 // function that is not a constructor declares that member function to be
4412 // const. [...] The class of which that function is a member shall be
4415 // If the class has virtual bases, any constexpr members will already have
4416 // been diagnosed by the checks performed on the member declaration, so
4417 // suppress this (less useful) diagnostic.
4419 // We delay this until we know whether an explicitly-defaulted (or deleted)
4420 // destructor for the class is trivial.
4421 if (LangOpts.CPlusPlus11 && !Record->isDependentType() &&
4422 !Record->isLiteral() && !Record->getNumVBases()) {
4423 for (CXXRecordDecl::method_iterator M = Record->method_begin(),
4424 MEnd = Record->method_end();
4426 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) {
4427 switch (Record->getTemplateSpecializationKind()) {
4428 case TSK_ImplicitInstantiation:
4429 case TSK_ExplicitInstantiationDeclaration:
4430 case TSK_ExplicitInstantiationDefinition:
4431 // If a template instantiates to a non-literal type, but its members
4432 // instantiate to constexpr functions, the template is technically
4433 // ill-formed, but we allow it for sanity.
4436 case TSK_Undeclared:
4437 case TSK_ExplicitSpecialization:
4438 RequireLiteralType(M->getLocation(), Context.getRecordType(Record),
4439 diag::err_constexpr_method_non_literal);
4443 // Only produce one error per class.
4449 // Check to see if we're trying to lay out a struct using the ms_struct
4450 // attribute that is dynamic.
4451 if (Record->isMsStruct(Context) && Record->isDynamicClass()) {
4452 Diag(Record->getLocation(), diag::warn_pragma_ms_struct_failed);
4453 Record->dropAttr<MsStructAttr>();
4456 // Declare inheriting constructors. We do this eagerly here because:
4457 // - The standard requires an eager diagnostic for conflicting inheriting
4458 // constructors from different classes.
4459 // - The lazy declaration of the other implicit constructors is so as to not
4460 // waste space and performance on classes that are not meant to be
4461 // instantiated (e.g. meta-functions). This doesn't apply to classes that
4462 // have inheriting constructors.
4463 DeclareInheritingConstructors(Record);
4466 /// Is the special member function which would be selected to perform the
4467 /// specified operation on the specified class type a constexpr constructor?
4468 static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl,
4469 Sema::CXXSpecialMember CSM,
4471 Sema::SpecialMemberOverloadResult *SMOR =
4472 S.LookupSpecialMember(ClassDecl, CSM, ConstArg,
4473 false, false, false, false);
4474 if (!SMOR || !SMOR->getMethod())
4475 // A constructor we wouldn't select can't be "involved in initializing"
4478 return SMOR->getMethod()->isConstexpr();
4481 /// Determine whether the specified special member function would be constexpr
4482 /// if it were implicitly defined.
4483 static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl,
4484 Sema::CXXSpecialMember CSM,
4486 if (!S.getLangOpts().CPlusPlus11)
4489 // C++11 [dcl.constexpr]p4:
4490 // In the definition of a constexpr constructor [...]
4493 case Sema::CXXDefaultConstructor:
4494 // Since default constructor lookup is essentially trivial (and cannot
4495 // involve, for instance, template instantiation), we compute whether a
4496 // defaulted default constructor is constexpr directly within CXXRecordDecl.
4498 // This is important for performance; we need to know whether the default
4499 // constructor is constexpr to determine whether the type is a literal type.
4500 return ClassDecl->defaultedDefaultConstructorIsConstexpr();
4502 case Sema::CXXCopyConstructor:
4503 case Sema::CXXMoveConstructor:
4504 // For copy or move constructors, we need to perform overload resolution.
4507 case Sema::CXXCopyAssignment:
4508 case Sema::CXXMoveAssignment:
4509 if (!S.getLangOpts().CPlusPlus1y)
4511 // In C++1y, we need to perform overload resolution.
4515 case Sema::CXXDestructor:
4516 case Sema::CXXInvalid:
4520 // -- if the class is a non-empty union, or for each non-empty anonymous
4521 // union member of a non-union class, exactly one non-static data member
4522 // shall be initialized; [DR1359]
4524 // If we squint, this is guaranteed, since exactly one non-static data member
4525 // will be initialized (if the constructor isn't deleted), we just don't know
4527 if (Ctor && ClassDecl->isUnion())
4530 // -- the class shall not have any virtual base classes;
4531 if (Ctor && ClassDecl->getNumVBases())
4534 // C++1y [class.copy]p26:
4535 // -- [the class] is a literal type, and
4536 if (!Ctor && !ClassDecl->isLiteral())
4539 // -- every constructor involved in initializing [...] base class
4540 // sub-objects shall be a constexpr constructor;
4541 // -- the assignment operator selected to copy/move each direct base
4542 // class is a constexpr function, and
4543 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
4544 BEnd = ClassDecl->bases_end();
4546 const RecordType *BaseType = B->getType()->getAs<RecordType>();
4547 if (!BaseType) continue;
4549 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
4550 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg))
4554 // -- every constructor involved in initializing non-static data members
4555 // [...] shall be a constexpr constructor;
4556 // -- every non-static data member and base class sub-object shall be
4558 // -- for each non-stastic data member of X that is of class type (or array
4559 // thereof), the assignment operator selected to copy/move that member is
4560 // a constexpr function
4561 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
4562 FEnd = ClassDecl->field_end();
4564 if (F->isInvalidDecl())
4566 if (const RecordType *RecordTy =
4567 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) {
4568 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
4569 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg))
4574 // All OK, it's constexpr!
4578 static Sema::ImplicitExceptionSpecification
4579 computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) {
4580 switch (S.getSpecialMember(MD)) {
4581 case Sema::CXXDefaultConstructor:
4582 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD);
4583 case Sema::CXXCopyConstructor:
4584 return S.ComputeDefaultedCopyCtorExceptionSpec(MD);
4585 case Sema::CXXCopyAssignment:
4586 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD);
4587 case Sema::CXXMoveConstructor:
4588 return S.ComputeDefaultedMoveCtorExceptionSpec(MD);
4589 case Sema::CXXMoveAssignment:
4590 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD);
4591 case Sema::CXXDestructor:
4592 return S.ComputeDefaultedDtorExceptionSpec(MD);
4593 case Sema::CXXInvalid:
4596 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() &&
4597 "only special members have implicit exception specs");
4598 return S.ComputeInheritingCtorExceptionSpec(cast<CXXConstructorDecl>(MD));
4602 updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT,
4603 const Sema::ImplicitExceptionSpecification &ExceptSpec) {
4604 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
4605 ExceptSpec.getEPI(EPI);
4606 FD->setType(S.Context.getFunctionType(FPT->getResultType(),
4607 FPT->getArgTypes(), EPI));
4610 static FunctionProtoType::ExtProtoInfo getImplicitMethodEPI(Sema &S,
4611 CXXMethodDecl *MD) {
4612 FunctionProtoType::ExtProtoInfo EPI;
4614 // Build an exception specification pointing back at this member.
4615 EPI.ExceptionSpecType = EST_Unevaluated;
4616 EPI.ExceptionSpecDecl = MD;
4618 // Set the calling convention to the default for C++ instance methods.
4619 EPI.ExtInfo = EPI.ExtInfo.withCallingConv(
4620 S.Context.getDefaultCallingConvention(/*IsVariadic=*/false,
4621 /*IsCXXMethod=*/true));
4625 void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) {
4626 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
4627 if (FPT->getExceptionSpecType() != EST_Unevaluated)
4630 // Evaluate the exception specification.
4631 ImplicitExceptionSpecification ExceptSpec =
4632 computeImplicitExceptionSpec(*this, Loc, MD);
4634 // Update the type of the special member to use it.
4635 updateExceptionSpec(*this, MD, FPT, ExceptSpec);
4637 // A user-provided destructor can be defined outside the class. When that
4638 // happens, be sure to update the exception specification on both
4640 const FunctionProtoType *CanonicalFPT =
4641 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>();
4642 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated)
4643 updateExceptionSpec(*this, MD->getCanonicalDecl(),
4644 CanonicalFPT, ExceptSpec);
4647 void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) {
4648 CXXRecordDecl *RD = MD->getParent();
4649 CXXSpecialMember CSM = getSpecialMember(MD);
4651 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid &&
4652 "not an explicitly-defaulted special member");
4654 // Whether this was the first-declared instance of the constructor.
4655 // This affects whether we implicitly add an exception spec and constexpr.
4656 bool First = MD == MD->getCanonicalDecl();
4658 bool HadError = false;
4660 // C++11 [dcl.fct.def.default]p1:
4661 // A function that is explicitly defaulted shall
4662 // -- be a special member function (checked elsewhere),
4663 // -- have the same type (except for ref-qualifiers, and except that a
4664 // copy operation can take a non-const reference) as an implicit
4666 // -- not have default arguments.
4667 unsigned ExpectedParams = 1;
4668 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor)
4670 if (MD->getNumParams() != ExpectedParams) {
4671 // This also checks for default arguments: a copy or move constructor with a
4672 // default argument is classified as a default constructor, and assignment
4673 // operations and destructors can't have default arguments.
4674 Diag(MD->getLocation(), diag::err_defaulted_special_member_params)
4675 << CSM << MD->getSourceRange();
4677 } else if (MD->isVariadic()) {
4678 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic)
4679 << CSM << MD->getSourceRange();
4683 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>();
4685 bool CanHaveConstParam = false;
4686 if (CSM == CXXCopyConstructor)
4687 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam();
4688 else if (CSM == CXXCopyAssignment)
4689 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam();
4691 QualType ReturnType = Context.VoidTy;
4692 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) {
4693 // Check for return type matching.
4694 ReturnType = Type->getResultType();
4695 QualType ExpectedReturnType =
4696 Context.getLValueReferenceType(Context.getTypeDeclType(RD));
4697 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) {
4698 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type)
4699 << (CSM == CXXMoveAssignment) << ExpectedReturnType;
4703 // A defaulted special member cannot have cv-qualifiers.
4704 if (Type->getTypeQuals()) {
4705 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals)
4706 << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus1y;
4711 // Check for parameter type matching.
4712 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType();
4713 bool HasConstParam = false;
4714 if (ExpectedParams && ArgType->isReferenceType()) {
4715 // Argument must be reference to possibly-const T.
4716 QualType ReferentType = ArgType->getPointeeType();
4717 HasConstParam = ReferentType.isConstQualified();
4719 if (ReferentType.isVolatileQualified()) {
4720 Diag(MD->getLocation(),
4721 diag::err_defaulted_special_member_volatile_param) << CSM;
4725 if (HasConstParam && !CanHaveConstParam) {
4726 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) {
4727 Diag(MD->getLocation(),
4728 diag::err_defaulted_special_member_copy_const_param)
4729 << (CSM == CXXCopyAssignment);
4730 // FIXME: Explain why this special member can't be const.
4732 Diag(MD->getLocation(),
4733 diag::err_defaulted_special_member_move_const_param)
4734 << (CSM == CXXMoveAssignment);
4738 } else if (ExpectedParams) {
4739 // A copy assignment operator can take its argument by value, but a
4740 // defaulted one cannot.
4741 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument");
4742 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref);
4746 // C++11 [dcl.fct.def.default]p2:
4747 // An explicitly-defaulted function may be declared constexpr only if it
4748 // would have been implicitly declared as constexpr,
4749 // Do not apply this rule to members of class templates, since core issue 1358
4750 // makes such functions always instantiate to constexpr functions. For
4751 // functions which cannot be constexpr (for non-constructors in C++11 and for
4752 // destructors in C++1y), this is checked elsewhere.
4753 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM,
4755 if ((getLangOpts().CPlusPlus1y ? !isa<CXXDestructorDecl>(MD)
4756 : isa<CXXConstructorDecl>(MD)) &&
4757 MD->isConstexpr() && !Constexpr &&
4758 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) {
4759 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM;
4760 // FIXME: Explain why the special member can't be constexpr.
4764 // and may have an explicit exception-specification only if it is compatible
4765 // with the exception-specification on the implicit declaration.
4766 if (Type->hasExceptionSpec()) {
4767 // Delay the check if this is the first declaration of the special member,
4768 // since we may not have parsed some necessary in-class initializers yet.
4770 // If the exception specification needs to be instantiated, do so now,
4771 // before we clobber it with an EST_Unevaluated specification below.
4772 if (Type->getExceptionSpecType() == EST_Uninstantiated) {
4773 InstantiateExceptionSpec(MD->getLocStart(), MD);
4774 Type = MD->getType()->getAs<FunctionProtoType>();
4776 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type));
4778 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type);
4781 // If a function is explicitly defaulted on its first declaration,
4783 // -- it is implicitly considered to be constexpr if the implicit
4784 // definition would be,
4785 MD->setConstexpr(Constexpr);
4787 // -- it is implicitly considered to have the same exception-specification
4788 // as if it had been implicitly declared,
4789 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo();
4790 EPI.ExceptionSpecType = EST_Unevaluated;
4791 EPI.ExceptionSpecDecl = MD;
4792 MD->setType(Context.getFunctionType(ReturnType,
4793 ArrayRef<QualType>(&ArgType,
4798 if (ShouldDeleteSpecialMember(MD, CSM)) {
4800 SetDeclDeleted(MD, MD->getLocation());
4802 // C++11 [dcl.fct.def.default]p4:
4803 // [For a] user-provided explicitly-defaulted function [...] if such a
4804 // function is implicitly defined as deleted, the program is ill-formed.
4805 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM;
4811 MD->setInvalidDecl();
4814 /// Check whether the exception specification provided for an
4815 /// explicitly-defaulted special member matches the exception specification
4816 /// that would have been generated for an implicit special member, per
4817 /// C++11 [dcl.fct.def.default]p2.
4818 void Sema::CheckExplicitlyDefaultedMemberExceptionSpec(
4819 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) {
4820 // Compute the implicit exception specification.
4821 CallingConv CC = Context.getDefaultCallingConvention(/*IsVariadic=*/false,
4822 /*IsCXXMethod=*/true);
4823 FunctionProtoType::ExtProtoInfo EPI(CC);
4824 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI);
4825 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>(
4826 Context.getFunctionType(Context.VoidTy, None, EPI));
4828 // Ensure that it matches.
4829 CheckEquivalentExceptionSpec(
4830 PDiag(diag::err_incorrect_defaulted_exception_spec)
4831 << getSpecialMember(MD), PDiag(),
4832 ImplicitType, SourceLocation(),
4833 SpecifiedType, MD->getLocation());
4836 void Sema::CheckDelayedMemberExceptionSpecs() {
4837 SmallVector<std::pair<const CXXDestructorDecl *, const CXXDestructorDecl *>,
4839 SmallVector<std::pair<CXXMethodDecl *, const FunctionProtoType *>, 2> Specs;
4841 std::swap(Checks, DelayedDestructorExceptionSpecChecks);
4842 std::swap(Specs, DelayedDefaultedMemberExceptionSpecs);
4844 // Perform any deferred checking of exception specifications for virtual
4846 for (unsigned i = 0, e = Checks.size(); i != e; ++i) {
4847 const CXXDestructorDecl *Dtor = Checks[i].first;
4848 assert(!Dtor->getParent()->isDependentType() &&
4849 "Should not ever add destructors of templates into the list.");
4850 CheckOverridingFunctionExceptionSpec(Dtor, Checks[i].second);
4853 // Check that any explicitly-defaulted methods have exception specifications
4854 // compatible with their implicit exception specifications.
4855 for (unsigned I = 0, N = Specs.size(); I != N; ++I)
4856 CheckExplicitlyDefaultedMemberExceptionSpec(Specs[I].first,
4861 struct SpecialMemberDeletionInfo {
4864 Sema::CXXSpecialMember CSM;
4867 // Properties of the special member, computed for convenience.
4868 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg;
4871 bool AllFieldsAreConst;
4873 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD,
4874 Sema::CXXSpecialMember CSM, bool Diagnose)
4875 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose),
4876 IsConstructor(false), IsAssignment(false), IsMove(false),
4877 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()),
4878 AllFieldsAreConst(true) {
4880 case Sema::CXXDefaultConstructor:
4881 case Sema::CXXCopyConstructor:
4882 IsConstructor = true;
4884 case Sema::CXXMoveConstructor:
4885 IsConstructor = true;
4888 case Sema::CXXCopyAssignment:
4889 IsAssignment = true;
4891 case Sema::CXXMoveAssignment:
4892 IsAssignment = true;
4895 case Sema::CXXDestructor:
4897 case Sema::CXXInvalid:
4898 llvm_unreachable("invalid special member kind");
4901 if (MD->getNumParams()) {
4902 ConstArg = MD->getParamDecl(0)->getType().isConstQualified();
4903 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified();
4907 bool inUnion() const { return MD->getParent()->isUnion(); }
4909 /// Look up the corresponding special member in the given class.
4910 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class,
4912 unsigned TQ = MD->getTypeQualifiers();
4913 // cv-qualifiers on class members don't affect default ctor / dtor calls.
4914 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor)
4916 // cv-qualifiers on class members affect the type of both '*this' and the
4917 // argument for an assignment.
4920 return S.LookupSpecialMember(Class, CSM,
4921 ConstArg || (Quals & Qualifiers::Const),
4922 VolatileArg || (Quals & Qualifiers::Volatile),
4923 MD->getRefQualifier() == RQ_RValue,
4924 TQ & Qualifiers::Const,
4925 TQ & Qualifiers::Volatile);
4928 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject;
4930 bool shouldDeleteForBase(CXXBaseSpecifier *Base);
4931 bool shouldDeleteForField(FieldDecl *FD);
4932 bool shouldDeleteForAllConstMembers();
4934 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj,
4936 bool shouldDeleteForSubobjectCall(Subobject Subobj,
4937 Sema::SpecialMemberOverloadResult *SMOR,
4938 bool IsDtorCallInCtor);
4940 bool isAccessible(Subobject Subobj, CXXMethodDecl *D);
4944 /// Is the given special member inaccessible when used on the given
4946 bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj,
4947 CXXMethodDecl *target) {
4948 /// If we're operating on a base class, the object type is the
4949 /// type of this special member.
4951 AccessSpecifier access = target->getAccess();
4952 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) {
4953 objectTy = S.Context.getTypeDeclType(MD->getParent());
4954 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access);
4956 // If we're operating on a field, the object type is the type of the field.
4958 objectTy = S.Context.getTypeDeclType(target->getParent());
4961 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy);
4964 /// Check whether we should delete a special member due to the implicit
4965 /// definition containing a call to a special member of a subobject.
4966 bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall(
4967 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR,
4968 bool IsDtorCallInCtor) {
4969 CXXMethodDecl *Decl = SMOR->getMethod();
4970 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
4974 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)
4975 DiagKind = !Decl ? 0 : 1;
4976 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
4978 else if (!isAccessible(Subobj, Decl))
4980 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() &&
4981 !Decl->isTrivial()) {
4982 // A member of a union must have a trivial corresponding special member.
4983 // As a weird special case, a destructor call from a union's constructor
4984 // must be accessible and non-deleted, but need not be trivial. Such a
4985 // destructor is never actually called, but is semantically checked as
4995 S.Diag(Field->getLocation(),
4996 diag::note_deleted_special_member_class_subobject)
4997 << CSM << MD->getParent() << /*IsField*/true
4998 << Field << DiagKind << IsDtorCallInCtor;
5000 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>();
5001 S.Diag(Base->getLocStart(),
5002 diag::note_deleted_special_member_class_subobject)
5003 << CSM << MD->getParent() << /*IsField*/false
5004 << Base->getType() << DiagKind << IsDtorCallInCtor;
5008 S.NoteDeletedFunction(Decl);
5009 // FIXME: Explain inaccessibility if DiagKind == 3.
5015 /// Check whether we should delete a special member function due to having a
5016 /// direct or virtual base class or non-static data member of class type M.
5017 bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject(
5018 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) {
5019 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
5021 // C++11 [class.ctor]p5:
5022 // -- any direct or virtual base class, or non-static data member with no
5023 // brace-or-equal-initializer, has class type M (or array thereof) and
5024 // either M has no default constructor or overload resolution as applied
5025 // to M's default constructor results in an ambiguity or in a function
5026 // that is deleted or inaccessible
5027 // C++11 [class.copy]p11, C++11 [class.copy]p23:
5028 // -- a direct or virtual base class B that cannot be copied/moved because
5029 // overload resolution, as applied to B's corresponding special member,
5030 // results in an ambiguity or a function that is deleted or inaccessible
5031 // from the defaulted special member
5032 // C++11 [class.dtor]p5:
5033 // -- any direct or virtual base class [...] has a type with a destructor
5034 // that is deleted or inaccessible
5035 if (!(CSM == Sema::CXXDefaultConstructor &&
5036 Field && Field->hasInClassInitializer()) &&
5037 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false))
5040 // C++11 [class.ctor]p5, C++11 [class.copy]p11:
5041 // -- any direct or virtual base class or non-static data member has a
5042 // type with a destructor that is deleted or inaccessible
5043 if (IsConstructor) {
5044 Sema::SpecialMemberOverloadResult *SMOR =
5045 S.LookupSpecialMember(Class, Sema::CXXDestructor,
5046 false, false, false, false, false);
5047 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true))
5054 /// Check whether we should delete a special member function due to the class
5055 /// having a particular direct or virtual base class.
5056 bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) {
5057 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl();
5058 return shouldDeleteForClassSubobject(BaseClass, Base, 0);
5061 /// Check whether we should delete a special member function due to the class
5062 /// having a particular non-static data member.
5063 bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) {
5064 QualType FieldType = S.Context.getBaseElementType(FD->getType());
5065 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl();
5067 if (CSM == Sema::CXXDefaultConstructor) {
5068 // For a default constructor, all references must be initialized in-class
5069 // and, if a union, it must have a non-const member.
5070 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) {
5072 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
5073 << MD->getParent() << FD << FieldType << /*Reference*/0;
5076 // C++11 [class.ctor]p5: any non-variant non-static data member of
5077 // const-qualified type (or array thereof) with no
5078 // brace-or-equal-initializer does not have a user-provided default
5080 if (!inUnion() && FieldType.isConstQualified() &&
5081 !FD->hasInClassInitializer() &&
5082 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) {
5084 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
5085 << MD->getParent() << FD << FD->getType() << /*Const*/1;
5089 if (inUnion() && !FieldType.isConstQualified())
5090 AllFieldsAreConst = false;
5091 } else if (CSM == Sema::CXXCopyConstructor) {
5092 // For a copy constructor, data members must not be of rvalue reference
5094 if (FieldType->isRValueReferenceType()) {
5096 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference)
5097 << MD->getParent() << FD << FieldType;
5100 } else if (IsAssignment) {
5101 // For an assignment operator, data members must not be of reference type.
5102 if (FieldType->isReferenceType()) {
5104 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
5105 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0;
5108 if (!FieldRecord && FieldType.isConstQualified()) {
5109 // C++11 [class.copy]p23:
5110 // -- a non-static data member of const non-class type (or array thereof)
5112 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
5113 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1;
5119 // Some additional restrictions exist on the variant members.
5120 if (!inUnion() && FieldRecord->isUnion() &&
5121 FieldRecord->isAnonymousStructOrUnion()) {
5122 bool AllVariantFieldsAreConst = true;
5124 // FIXME: Handle anonymous unions declared within anonymous unions.
5125 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(),
5126 UE = FieldRecord->field_end();
5128 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType());
5130 if (!UnionFieldType.isConstQualified())
5131 AllVariantFieldsAreConst = false;
5133 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl();
5134 if (UnionFieldRecord &&
5135 shouldDeleteForClassSubobject(UnionFieldRecord, *UI,
5136 UnionFieldType.getCVRQualifiers()))
5140 // At least one member in each anonymous union must be non-const
5141 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst &&
5142 FieldRecord->field_begin() != FieldRecord->field_end()) {
5144 S.Diag(FieldRecord->getLocation(),
5145 diag::note_deleted_default_ctor_all_const)
5146 << MD->getParent() << /*anonymous union*/1;
5150 // Don't check the implicit member of the anonymous union type.
5151 // This is technically non-conformant, but sanity demands it.
5155 if (shouldDeleteForClassSubobject(FieldRecord, FD,
5156 FieldType.getCVRQualifiers()))
5163 /// C++11 [class.ctor] p5:
5164 /// A defaulted default constructor for a class X is defined as deleted if
5165 /// X is a union and all of its variant members are of const-qualified type.
5166 bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() {
5167 // This is a silly definition, because it gives an empty union a deleted
5168 // default constructor. Don't do that.
5169 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst &&
5170 (MD->getParent()->field_begin() != MD->getParent()->field_end())) {
5172 S.Diag(MD->getParent()->getLocation(),
5173 diag::note_deleted_default_ctor_all_const)
5174 << MD->getParent() << /*not anonymous union*/0;
5180 /// Determine whether a defaulted special member function should be defined as
5181 /// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11,
5182 /// C++11 [class.copy]p23, and C++11 [class.dtor]p5.
5183 bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM,
5185 if (MD->isInvalidDecl())
5187 CXXRecordDecl *RD = MD->getParent();
5188 assert(!RD->isDependentType() && "do deletion after instantiation");
5189 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl())
5192 // C++11 [expr.lambda.prim]p19:
5193 // The closure type associated with a lambda-expression has a
5194 // deleted (8.4.3) default constructor and a deleted copy
5195 // assignment operator.
5196 if (RD->isLambda() &&
5197 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) {
5199 Diag(RD->getLocation(), diag::note_lambda_decl);
5203 // For an anonymous struct or union, the copy and assignment special members
5204 // will never be used, so skip the check. For an anonymous union declared at
5205 // namespace scope, the constructor and destructor are used.
5206 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor &&
5207 RD->isAnonymousStructOrUnion())
5210 // C++11 [class.copy]p7, p18:
5211 // If the class definition declares a move constructor or move assignment
5212 // operator, an implicitly declared copy constructor or copy assignment
5213 // operator is defined as deleted.
5214 if (MD->isImplicit() &&
5215 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) {
5216 CXXMethodDecl *UserDeclaredMove = 0;
5218 // In Microsoft mode, a user-declared move only causes the deletion of the
5219 // corresponding copy operation, not both copy operations.
5220 if (RD->hasUserDeclaredMoveConstructor() &&
5221 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) {
5222 if (!Diagnose) return true;
5224 // Find any user-declared move constructor.
5225 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(),
5226 E = RD->ctor_end(); I != E; ++I) {
5227 if (I->isMoveConstructor()) {
5228 UserDeclaredMove = *I;
5232 assert(UserDeclaredMove);
5233 } else if (RD->hasUserDeclaredMoveAssignment() &&
5234 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) {
5235 if (!Diagnose) return true;
5237 // Find any user-declared move assignment operator.
5238 for (CXXRecordDecl::method_iterator I = RD->method_begin(),
5239 E = RD->method_end(); I != E; ++I) {
5240 if (I->isMoveAssignmentOperator()) {
5241 UserDeclaredMove = *I;
5245 assert(UserDeclaredMove);
5248 if (UserDeclaredMove) {
5249 Diag(UserDeclaredMove->getLocation(),
5250 diag::note_deleted_copy_user_declared_move)
5251 << (CSM == CXXCopyAssignment) << RD
5252 << UserDeclaredMove->isMoveAssignmentOperator();
5257 // Do access control from the special member function
5258 ContextRAII MethodContext(*this, MD);
5260 // C++11 [class.dtor]p5:
5261 // -- for a virtual destructor, lookup of the non-array deallocation function
5262 // results in an ambiguity or in a function that is deleted or inaccessible
5263 if (CSM == CXXDestructor && MD->isVirtual()) {
5264 FunctionDecl *OperatorDelete = 0;
5265 DeclarationName Name =
5266 Context.DeclarationNames.getCXXOperatorName(OO_Delete);
5267 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name,
5268 OperatorDelete, false)) {
5270 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete);
5275 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose);
5277 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(),
5278 BE = RD->bases_end(); BI != BE; ++BI)
5279 if (!BI->isVirtual() &&
5280 SMI.shouldDeleteForBase(BI))
5283 // Per DR1611, do not consider virtual bases of constructors of abstract
5284 // classes, since we are not going to construct them.
5285 if (!RD->isAbstract() || !SMI.IsConstructor) {
5286 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(),
5287 BE = RD->vbases_end();
5289 if (SMI.shouldDeleteForBase(BI))
5293 for (CXXRecordDecl::field_iterator FI = RD->field_begin(),
5294 FE = RD->field_end(); FI != FE; ++FI)
5295 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() &&
5296 SMI.shouldDeleteForField(*FI))
5299 if (SMI.shouldDeleteForAllConstMembers())
5305 /// Perform lookup for a special member of the specified kind, and determine
5306 /// whether it is trivial. If the triviality can be determined without the
5307 /// lookup, skip it. This is intended for use when determining whether a
5308 /// special member of a containing object is trivial, and thus does not ever
5309 /// perform overload resolution for default constructors.
5311 /// If \p Selected is not \c NULL, \c *Selected will be filled in with the
5312 /// member that was most likely to be intended to be trivial, if any.
5313 static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD,
5314 Sema::CXXSpecialMember CSM, unsigned Quals,
5315 CXXMethodDecl **Selected) {
5320 case Sema::CXXInvalid:
5321 llvm_unreachable("not a special member");
5323 case Sema::CXXDefaultConstructor:
5324 // C++11 [class.ctor]p5:
5325 // A default constructor is trivial if:
5326 // - all the [direct subobjects] have trivial default constructors
5328 // Note, no overload resolution is performed in this case.
5329 if (RD->hasTrivialDefaultConstructor())
5333 // If there's a default constructor which could have been trivial, dig it
5334 // out. Otherwise, if there's any user-provided default constructor, point
5335 // to that as an example of why there's not a trivial one.
5336 CXXConstructorDecl *DefCtor = 0;
5337 if (RD->needsImplicitDefaultConstructor())
5338 S.DeclareImplicitDefaultConstructor(RD);
5339 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(),
5340 CE = RD->ctor_end(); CI != CE; ++CI) {
5341 if (!CI->isDefaultConstructor())
5344 if (!DefCtor->isUserProvided())
5348 *Selected = DefCtor;
5353 case Sema::CXXDestructor:
5354 // C++11 [class.dtor]p5:
5355 // A destructor is trivial if:
5356 // - all the direct [subobjects] have trivial destructors
5357 if (RD->hasTrivialDestructor())
5361 if (RD->needsImplicitDestructor())
5362 S.DeclareImplicitDestructor(RD);
5363 *Selected = RD->getDestructor();
5368 case Sema::CXXCopyConstructor:
5369 // C++11 [class.copy]p12:
5370 // A copy constructor is trivial if:
5371 // - the constructor selected to copy each direct [subobject] is trivial
5372 if (RD->hasTrivialCopyConstructor()) {
5373 if (Quals == Qualifiers::Const)
5374 // We must either select the trivial copy constructor or reach an
5375 // ambiguity; no need to actually perform overload resolution.
5377 } else if (!Selected) {
5380 // In C++98, we are not supposed to perform overload resolution here, but we
5381 // treat that as a language defect, as suggested on cxx-abi-dev, to treat
5382 // cases like B as having a non-trivial copy constructor:
5383 // struct A { template<typename T> A(T&); };
5384 // struct B { mutable A a; };
5385 goto NeedOverloadResolution;
5387 case Sema::CXXCopyAssignment:
5388 // C++11 [class.copy]p25:
5389 // A copy assignment operator is trivial if:
5390 // - the assignment operator selected to copy each direct [subobject] is
5392 if (RD->hasTrivialCopyAssignment()) {
5393 if (Quals == Qualifiers::Const)
5395 } else if (!Selected) {
5398 // In C++98, we are not supposed to perform overload resolution here, but we
5399 // treat that as a language defect.
5400 goto NeedOverloadResolution;
5402 case Sema::CXXMoveConstructor:
5403 case Sema::CXXMoveAssignment:
5404 NeedOverloadResolution:
5405 Sema::SpecialMemberOverloadResult *SMOR =
5406 S.LookupSpecialMember(RD, CSM,
5407 Quals & Qualifiers::Const,
5408 Quals & Qualifiers::Volatile,
5409 /*RValueThis*/false, /*ConstThis*/false,
5410 /*VolatileThis*/false);
5412 // The standard doesn't describe how to behave if the lookup is ambiguous.
5413 // We treat it as not making the member non-trivial, just like the standard
5414 // mandates for the default constructor. This should rarely matter, because
5415 // the member will also be deleted.
5416 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
5419 if (!SMOR->getMethod()) {
5420 assert(SMOR->getKind() ==
5421 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted);
5425 // We deliberately don't check if we found a deleted special member. We're
5428 *Selected = SMOR->getMethod();
5429 return SMOR->getMethod()->isTrivial();
5432 llvm_unreachable("unknown special method kind");
5435 static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) {
5436 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end();
5438 if (!CI->isImplicit())
5441 // Look for constructor templates.
5442 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter;
5443 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) {
5444 if (CXXConstructorDecl *CD =
5445 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()))
5452 /// The kind of subobject we are checking for triviality. The values of this
5453 /// enumeration are used in diagnostics.
5454 enum TrivialSubobjectKind {
5455 /// The subobject is a base class.
5457 /// The subobject is a non-static data member.
5459 /// The object is actually the complete object.
5463 /// Check whether the special member selected for a given type would be trivial.
5464 static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc,
5466 Sema::CXXSpecialMember CSM,
5467 TrivialSubobjectKind Kind,
5469 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl();
5473 CXXMethodDecl *Selected;
5474 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(),
5475 Diagnose ? &Selected : 0))
5479 if (!Selected && CSM == Sema::CXXDefaultConstructor) {
5480 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor)
5481 << Kind << SubType.getUnqualifiedType();
5482 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD))
5483 S.Diag(CD->getLocation(), diag::note_user_declared_ctor);
5484 } else if (!Selected)
5485 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy)
5486 << Kind << SubType.getUnqualifiedType() << CSM << SubType;
5487 else if (Selected->isUserProvided()) {
5488 if (Kind == TSK_CompleteObject)
5489 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided)
5490 << Kind << SubType.getUnqualifiedType() << CSM;
5492 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided)
5493 << Kind << SubType.getUnqualifiedType() << CSM;
5494 S.Diag(Selected->getLocation(), diag::note_declared_at);
5497 if (Kind != TSK_CompleteObject)
5498 S.Diag(SubobjLoc, diag::note_nontrivial_subobject)
5499 << Kind << SubType.getUnqualifiedType() << CSM;
5501 // Explain why the defaulted or deleted special member isn't trivial.
5502 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose);
5509 /// Check whether the members of a class type allow a special member to be
5511 static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD,
5512 Sema::CXXSpecialMember CSM,
5513 bool ConstArg, bool Diagnose) {
5514 for (CXXRecordDecl::field_iterator FI = RD->field_begin(),
5515 FE = RD->field_end(); FI != FE; ++FI) {
5516 if (FI->isInvalidDecl() || FI->isUnnamedBitfield())
5519 QualType FieldType = S.Context.getBaseElementType(FI->getType());
5521 // Pretend anonymous struct or union members are members of this class.
5522 if (FI->isAnonymousStructOrUnion()) {
5523 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(),
5524 CSM, ConstArg, Diagnose))
5529 // C++11 [class.ctor]p5:
5530 // A default constructor is trivial if [...]
5531 // -- no non-static data member of its class has a
5532 // brace-or-equal-initializer
5533 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) {
5535 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI;
5539 // Objective C ARC 4.3.5:
5540 // [...] nontrivally ownership-qualified types are [...] not trivially
5541 // default constructible, copy constructible, move constructible, copy
5542 // assignable, move assignable, or destructible [...]
5543 if (S.getLangOpts().ObjCAutoRefCount &&
5544 FieldType.hasNonTrivialObjCLifetime()) {
5546 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership)
5547 << RD << FieldType.getObjCLifetime();
5551 if (ConstArg && !FI->isMutable())
5552 FieldType.addConst();
5553 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM,
5554 TSK_Field, Diagnose))
5561 /// Diagnose why the specified class does not have a trivial special member of
5563 void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) {
5564 QualType Ty = Context.getRecordType(RD);
5565 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)
5568 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM,
5569 TSK_CompleteObject, /*Diagnose*/true);
5572 /// Determine whether a defaulted or deleted special member function is trivial,
5573 /// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12,
5574 /// C++11 [class.copy]p25, and C++11 [class.dtor]p5.
5575 bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM,
5577 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough");
5579 CXXRecordDecl *RD = MD->getParent();
5581 bool ConstArg = false;
5583 // C++11 [class.copy]p12, p25: [DR1593]
5584 // A [special member] is trivial if [...] its parameter-type-list is
5585 // equivalent to the parameter-type-list of an implicit declaration [...]
5587 case CXXDefaultConstructor:
5589 // Trivial default constructors and destructors cannot have parameters.
5592 case CXXCopyConstructor:
5593 case CXXCopyAssignment: {
5594 // Trivial copy operations always have const, non-volatile parameter types.
5596 const ParmVarDecl *Param0 = MD->getParamDecl(0);
5597 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>();
5598 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) {
5600 Diag(Param0->getLocation(), diag::note_nontrivial_param_type)
5601 << Param0->getSourceRange() << Param0->getType()
5602 << Context.getLValueReferenceType(
5603 Context.getRecordType(RD).withConst());
5609 case CXXMoveConstructor:
5610 case CXXMoveAssignment: {
5611 // Trivial move operations always have non-cv-qualified parameters.
5612 const ParmVarDecl *Param0 = MD->getParamDecl(0);
5613 const RValueReferenceType *RT =
5614 Param0->getType()->getAs<RValueReferenceType>();
5615 if (!RT || RT->getPointeeType().getCVRQualifiers()) {
5617 Diag(Param0->getLocation(), diag::note_nontrivial_param_type)
5618 << Param0->getSourceRange() << Param0->getType()
5619 << Context.getRValueReferenceType(Context.getRecordType(RD));
5626 llvm_unreachable("not a special member");
5629 if (MD->getMinRequiredArguments() < MD->getNumParams()) {
5631 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(),
5632 diag::note_nontrivial_default_arg)
5633 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange();
5636 if (MD->isVariadic()) {
5638 Diag(MD->getLocation(), diag::note_nontrivial_variadic);
5642 // C++11 [class.ctor]p5, C++11 [class.dtor]p5:
5643 // A copy/move [constructor or assignment operator] is trivial if
5644 // -- the [member] selected to copy/move each direct base class subobject
5647 // C++11 [class.copy]p12, C++11 [class.copy]p25:
5648 // A [default constructor or destructor] is trivial if
5649 // -- all the direct base classes have trivial [default constructors or
5651 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(),
5652 BE = RD->bases_end(); BI != BE; ++BI)
5653 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(),
5654 ConstArg ? BI->getType().withConst()
5656 CSM, TSK_BaseClass, Diagnose))
5659 // C++11 [class.ctor]p5, C++11 [class.dtor]p5:
5660 // A copy/move [constructor or assignment operator] for a class X is
5662 // -- for each non-static data member of X that is of class type (or array
5663 // thereof), the constructor selected to copy/move that member is
5666 // C++11 [class.copy]p12, C++11 [class.copy]p25:
5667 // A [default constructor or destructor] is trivial if
5668 // -- for all of the non-static data members of its class that are of class
5669 // type (or array thereof), each such class has a trivial [default
5670 // constructor or destructor]
5671 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose))
5674 // C++11 [class.dtor]p5:
5675 // A destructor is trivial if [...]
5676 // -- the destructor is not virtual
5677 if (CSM == CXXDestructor && MD->isVirtual()) {
5679 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD;
5683 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25:
5684 // A [special member] for class X is trivial if [...]
5685 // -- class X has no virtual functions and no virtual base classes
5686 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) {
5690 if (RD->getNumVBases()) {
5691 // Check for virtual bases. We already know that the corresponding
5692 // member in all bases is trivial, so vbases must all be direct.
5693 CXXBaseSpecifier &BS = *RD->vbases_begin();
5694 assert(BS.isVirtual());
5695 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1;
5699 // Must have a virtual method.
5700 for (CXXRecordDecl::method_iterator MI = RD->method_begin(),
5701 ME = RD->method_end(); MI != ME; ++MI) {
5702 if (MI->isVirtual()) {
5703 SourceLocation MLoc = MI->getLocStart();
5704 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0;
5709 llvm_unreachable("dynamic class with no vbases and no virtual functions");
5712 // Looks like it's trivial!
5716 /// \brief Data used with FindHiddenVirtualMethod
5718 struct FindHiddenVirtualMethodData {
5720 CXXMethodDecl *Method;
5721 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods;
5722 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
5726 /// \brief Check whether any most overriden method from MD in Methods
5727 static bool CheckMostOverridenMethods(const CXXMethodDecl *MD,
5728 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) {
5729 if (MD->size_overridden_methods() == 0)
5730 return Methods.count(MD->getCanonicalDecl());
5731 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
5732 E = MD->end_overridden_methods();
5734 if (CheckMostOverridenMethods(*I, Methods))
5739 /// \brief Member lookup function that determines whether a given C++
5740 /// method overloads virtual methods in a base class without overriding any,
5741 /// to be used with CXXRecordDecl::lookupInBases().
5742 static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier,
5745 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
5747 FindHiddenVirtualMethodData &Data
5748 = *static_cast<FindHiddenVirtualMethodData*>(UserData);
5750 DeclarationName Name = Data.Method->getDeclName();
5751 assert(Name.getNameKind() == DeclarationName::Identifier);
5753 bool foundSameNameMethod = false;
5754 SmallVector<CXXMethodDecl *, 8> overloadedMethods;
5755 for (Path.Decls = BaseRecord->lookup(Name);
5756 !Path.Decls.empty();
5757 Path.Decls = Path.Decls.slice(1)) {
5758 NamedDecl *D = Path.Decls.front();
5759 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
5760 MD = MD->getCanonicalDecl();
5761 foundSameNameMethod = true;
5762 // Interested only in hidden virtual methods.
5763 if (!MD->isVirtual())
5765 // If the method we are checking overrides a method from its base
5766 // don't warn about the other overloaded methods.
5767 if (!Data.S->IsOverload(Data.Method, MD, false))
5769 // Collect the overload only if its hidden.
5770 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods))
5771 overloadedMethods.push_back(MD);
5775 if (foundSameNameMethod)
5776 Data.OverloadedMethods.append(overloadedMethods.begin(),
5777 overloadedMethods.end());
5778 return foundSameNameMethod;
5781 /// \brief Add the most overriden methods from MD to Methods
5782 static void AddMostOverridenMethods(const CXXMethodDecl *MD,
5783 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) {
5784 if (MD->size_overridden_methods() == 0)
5785 Methods.insert(MD->getCanonicalDecl());
5786 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
5787 E = MD->end_overridden_methods();
5789 AddMostOverridenMethods(*I, Methods);
5792 /// \brief Check if a method overloads virtual methods in a base class without
5794 void Sema::FindHiddenVirtualMethods(CXXMethodDecl *MD,
5795 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) {
5796 if (!MD->getDeclName().isIdentifier())
5799 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases.
5800 /*bool RecordPaths=*/false,
5801 /*bool DetectVirtual=*/false);
5802 FindHiddenVirtualMethodData Data;
5806 // Keep the base methods that were overriden or introduced in the subclass
5807 // by 'using' in a set. A base method not in this set is hidden.
5808 CXXRecordDecl *DC = MD->getParent();
5809 DeclContext::lookup_result R = DC->lookup(MD->getDeclName());
5810 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) {
5812 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I))
5813 ND = shad->getTargetDecl();
5814 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
5815 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods);
5818 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths))
5819 OverloadedMethods = Data.OverloadedMethods;
5822 void Sema::NoteHiddenVirtualMethods(CXXMethodDecl *MD,
5823 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) {
5824 for (unsigned i = 0, e = OverloadedMethods.size(); i != e; ++i) {
5825 CXXMethodDecl *overloadedMD = OverloadedMethods[i];
5826 PartialDiagnostic PD = PDiag(
5827 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD;
5828 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType());
5829 Diag(overloadedMD->getLocation(), PD);
5833 /// \brief Diagnose methods which overload virtual methods in a base class
5834 /// without overriding any.
5835 void Sema::DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD) {
5836 if (MD->isInvalidDecl())
5839 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual,
5840 MD->getLocation()) == DiagnosticsEngine::Ignored)
5843 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
5844 FindHiddenVirtualMethods(MD, OverloadedMethods);
5845 if (!OverloadedMethods.empty()) {
5846 Diag(MD->getLocation(), diag::warn_overloaded_virtual)
5847 << MD << (OverloadedMethods.size() > 1);
5849 NoteHiddenVirtualMethods(MD, OverloadedMethods);
5853 void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
5855 SourceLocation LBrac,
5856 SourceLocation RBrac,
5857 AttributeList *AttrList) {
5861 AdjustDeclIfTemplate(TagDecl);
5863 for (const AttributeList* l = AttrList; l; l = l->getNext()) {
5864 if (l->getKind() != AttributeList::AT_Visibility)
5867 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) <<
5871 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef(
5872 // strict aliasing violation!
5873 reinterpret_cast<Decl**>(FieldCollector->getCurFields()),
5874 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList);
5876 CheckCompletedCXXClass(
5877 dyn_cast_or_null<CXXRecordDecl>(TagDecl));
5880 /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
5881 /// special functions, such as the default constructor, copy
5882 /// constructor, or destructor, to the given C++ class (C++
5883 /// [special]p1). This routine can only be executed just before the
5884 /// definition of the class is complete.
5885 void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
5886 if (!ClassDecl->hasUserDeclaredConstructor())
5887 ++ASTContext::NumImplicitDefaultConstructors;
5889 if (!ClassDecl->hasUserDeclaredCopyConstructor()) {
5890 ++ASTContext::NumImplicitCopyConstructors;
5892 // If the properties or semantics of the copy constructor couldn't be
5893 // determined while the class was being declared, force a declaration
5895 if (ClassDecl->needsOverloadResolutionForCopyConstructor())
5896 DeclareImplicitCopyConstructor(ClassDecl);
5899 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) {
5900 ++ASTContext::NumImplicitMoveConstructors;
5902 if (ClassDecl->needsOverloadResolutionForMoveConstructor())
5903 DeclareImplicitMoveConstructor(ClassDecl);
5906 if (!ClassDecl->hasUserDeclaredCopyAssignment()) {
5907 ++ASTContext::NumImplicitCopyAssignmentOperators;
5909 // If we have a dynamic class, then the copy assignment operator may be
5910 // virtual, so we have to declare it immediately. This ensures that, e.g.,
5911 // it shows up in the right place in the vtable and that we diagnose
5912 // problems with the implicit exception specification.
5913 if (ClassDecl->isDynamicClass() ||
5914 ClassDecl->needsOverloadResolutionForCopyAssignment())
5915 DeclareImplicitCopyAssignment(ClassDecl);
5918 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) {
5919 ++ASTContext::NumImplicitMoveAssignmentOperators;
5921 // Likewise for the move assignment operator.
5922 if (ClassDecl->isDynamicClass() ||
5923 ClassDecl->needsOverloadResolutionForMoveAssignment())
5924 DeclareImplicitMoveAssignment(ClassDecl);
5927 if (!ClassDecl->hasUserDeclaredDestructor()) {
5928 ++ASTContext::NumImplicitDestructors;
5930 // If we have a dynamic class, then the destructor may be virtual, so we
5931 // have to declare the destructor immediately. This ensures that, e.g., it
5932 // shows up in the right place in the vtable and that we diagnose problems
5933 // with the implicit exception specification.
5934 if (ClassDecl->isDynamicClass() ||
5935 ClassDecl->needsOverloadResolutionForDestructor())
5936 DeclareImplicitDestructor(ClassDecl);
5940 void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) {
5944 int NumParamList = D->getNumTemplateParameterLists();
5945 for (int i = 0; i < NumParamList; i++) {
5946 TemplateParameterList* Params = D->getTemplateParameterList(i);
5947 for (TemplateParameterList::iterator Param = Params->begin(),
5948 ParamEnd = Params->end();
5949 Param != ParamEnd; ++Param) {
5950 NamedDecl *Named = cast<NamedDecl>(*Param);
5951 if (Named->getDeclName()) {
5953 IdResolver.AddDecl(Named);
5959 void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) {
5963 TemplateParameterList *Params = 0;
5964 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D))
5965 Params = Template->getTemplateParameters();
5966 else if (ClassTemplatePartialSpecializationDecl *PartialSpec
5967 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
5968 Params = PartialSpec->getTemplateParameters();
5972 for (TemplateParameterList::iterator Param = Params->begin(),
5973 ParamEnd = Params->end();
5974 Param != ParamEnd; ++Param) {
5975 NamedDecl *Named = cast<NamedDecl>(*Param);
5976 if (Named->getDeclName()) {
5978 IdResolver.AddDecl(Named);
5983 void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
5984 if (!RecordD) return;
5985 AdjustDeclIfTemplate(RecordD);
5986 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD);
5987 PushDeclContext(S, Record);
5990 void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
5991 if (!RecordD) return;
5995 /// ActOnStartDelayedCXXMethodDeclaration - We have completed
5996 /// parsing a top-level (non-nested) C++ class, and we are now
5997 /// parsing those parts of the given Method declaration that could
5998 /// not be parsed earlier (C++ [class.mem]p2), such as default
5999 /// arguments. This action should enter the scope of the given
6000 /// Method declaration as if we had just parsed the qualified method
6001 /// name. However, it should not bring the parameters into scope;
6002 /// that will be performed by ActOnDelayedCXXMethodParameter.
6003 void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
6006 /// ActOnDelayedCXXMethodParameter - We've already started a delayed
6007 /// C++ method declaration. We're (re-)introducing the given
6008 /// function parameter into scope for use in parsing later parts of
6009 /// the method declaration. For example, we could see an
6010 /// ActOnParamDefaultArgument event for this parameter.
6011 void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) {
6015 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD);
6017 // If this parameter has an unparsed default argument, clear it out
6018 // to make way for the parsed default argument.
6019 if (Param->hasUnparsedDefaultArg())
6020 Param->setDefaultArg(0);
6023 if (Param->getDeclName())
6024 IdResolver.AddDecl(Param);
6027 /// ActOnFinishDelayedCXXMethodDeclaration - We have finished
6028 /// processing the delayed method declaration for Method. The method
6029 /// declaration is now considered finished. There may be a separate
6030 /// ActOnStartOfFunctionDef action later (not necessarily
6031 /// immediately!) for this method, if it was also defined inside the
6033 void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
6037 AdjustDeclIfTemplate(MethodD);
6039 FunctionDecl *Method = cast<FunctionDecl>(MethodD);
6041 // Now that we have our default arguments, check the constructor
6042 // again. It could produce additional diagnostics or affect whether
6043 // the class has implicitly-declared destructors, among other
6045 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method))
6046 CheckConstructor(Constructor);
6048 // Check the default arguments, which we may have added.
6049 if (!Method->isInvalidDecl())
6050 CheckCXXDefaultArguments(Method);
6053 /// CheckConstructorDeclarator - Called by ActOnDeclarator to check
6054 /// the well-formedness of the constructor declarator @p D with type @p
6055 /// R. If there are any errors in the declarator, this routine will
6056 /// emit diagnostics and set the invalid bit to true. In any case, the type
6057 /// will be updated to reflect a well-formed type for the constructor and
6059 QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R,
6061 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
6063 // C++ [class.ctor]p3:
6064 // A constructor shall not be virtual (10.3) or static (9.4). A
6065 // constructor can be invoked for a const, volatile or const
6066 // volatile object. A constructor shall not be declared const,
6067 // volatile, or const volatile (9.3.2).
6069 if (!D.isInvalidType())
6070 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
6071 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc())
6072 << SourceRange(D.getIdentifierLoc());
6075 if (SC == SC_Static) {
6076 if (!D.isInvalidType())
6077 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
6078 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
6079 << SourceRange(D.getIdentifierLoc());
6084 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
6085 if (FTI.TypeQuals != 0) {
6086 if (FTI.TypeQuals & Qualifiers::Const)
6087 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
6088 << "const" << SourceRange(D.getIdentifierLoc());
6089 if (FTI.TypeQuals & Qualifiers::Volatile)
6090 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
6091 << "volatile" << SourceRange(D.getIdentifierLoc());
6092 if (FTI.TypeQuals & Qualifiers::Restrict)
6093 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
6094 << "restrict" << SourceRange(D.getIdentifierLoc());
6098 // C++0x [class.ctor]p4:
6099 // A constructor shall not be declared with a ref-qualifier.
6100 if (FTI.hasRefQualifier()) {
6101 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor)
6102 << FTI.RefQualifierIsLValueRef
6103 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
6107 // Rebuild the function type "R" without any type qualifiers (in
6108 // case any of the errors above fired) and with "void" as the
6109 // return type, since constructors don't have return types.
6110 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
6111 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType())
6114 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
6116 EPI.RefQualifier = RQ_None;
6118 return Context.getFunctionType(Context.VoidTy, Proto->getArgTypes(), EPI);
6121 /// CheckConstructor - Checks a fully-formed constructor for
6122 /// well-formedness, issuing any diagnostics required. Returns true if
6123 /// the constructor declarator is invalid.
6124 void Sema::CheckConstructor(CXXConstructorDecl *Constructor) {
6125 CXXRecordDecl *ClassDecl
6126 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext());
6128 return Constructor->setInvalidDecl();
6130 // C++ [class.copy]p3:
6131 // A declaration of a constructor for a class X is ill-formed if
6132 // its first parameter is of type (optionally cv-qualified) X and
6133 // either there are no other parameters or else all other
6134 // parameters have default arguments.
6135 if (!Constructor->isInvalidDecl() &&
6136 ((Constructor->getNumParams() == 1) ||
6137 (Constructor->getNumParams() > 1 &&
6138 Constructor->getParamDecl(1)->hasDefaultArg())) &&
6139 Constructor->getTemplateSpecializationKind()
6140 != TSK_ImplicitInstantiation) {
6141 QualType ParamType = Constructor->getParamDecl(0)->getType();
6142 QualType ClassTy = Context.getTagDeclType(ClassDecl);
6143 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) {
6144 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation();
6145 const char *ConstRef
6146 = Constructor->getParamDecl(0)->getIdentifier() ? "const &"
6148 Diag(ParamLoc, diag::err_constructor_byvalue_arg)
6149 << FixItHint::CreateInsertion(ParamLoc, ConstRef);
6151 // FIXME: Rather that making the constructor invalid, we should endeavor
6153 Constructor->setInvalidDecl();
6158 /// CheckDestructor - Checks a fully-formed destructor definition for
6159 /// well-formedness, issuing any diagnostics required. Returns true
6161 bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) {
6162 CXXRecordDecl *RD = Destructor->getParent();
6164 if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) {
6167 if (!Destructor->isImplicit())
6168 Loc = Destructor->getLocation();
6170 Loc = RD->getLocation();
6172 // If we have a virtual destructor, look up the deallocation function
6173 FunctionDecl *OperatorDelete = 0;
6174 DeclarationName Name =
6175 Context.DeclarationNames.getCXXOperatorName(OO_Delete);
6176 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete))
6178 // If there's no class-specific operator delete, look up the global
6179 // non-array delete.
6180 if (!OperatorDelete)
6181 OperatorDelete = FindUsualDeallocationFunction(Loc, true, Name);
6183 MarkFunctionReferenced(Loc, OperatorDelete);
6185 Destructor->setOperatorDelete(OperatorDelete);
6192 FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) {
6193 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
6194 FTI.ArgInfo[0].Param &&
6195 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType());
6198 /// CheckDestructorDeclarator - Called by ActOnDeclarator to check
6199 /// the well-formednes of the destructor declarator @p D with type @p
6200 /// R. If there are any errors in the declarator, this routine will
6201 /// emit diagnostics and set the declarator to invalid. Even if this happens,
6202 /// will be updated to reflect a well-formed type for the destructor and
6204 QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R,
6206 // C++ [class.dtor]p1:
6207 // [...] A typedef-name that names a class is a class-name
6208 // (7.1.3); however, a typedef-name that names a class shall not
6209 // be used as the identifier in the declarator for a destructor
6211 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName);
6212 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>())
6213 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
6214 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl());
6215 else if (const TemplateSpecializationType *TST =
6216 DeclaratorType->getAs<TemplateSpecializationType>())
6217 if (TST->isTypeAlias())
6218 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
6219 << DeclaratorType << 1;
6221 // C++ [class.dtor]p2:
6222 // A destructor is used to destroy objects of its class type. A
6223 // destructor takes no parameters, and no return type can be
6224 // specified for it (not even void). The address of a destructor
6225 // shall not be taken. A destructor shall not be static. A
6226 // destructor can be invoked for a const, volatile or const
6227 // volatile object. A destructor shall not be declared const,
6228 // volatile or const volatile (9.3.2).
6229 if (SC == SC_Static) {
6230 if (!D.isInvalidType())
6231 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be)
6232 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
6233 << SourceRange(D.getIdentifierLoc())
6234 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
6238 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
6239 // Destructors don't have return types, but the parser will
6240 // happily parse something like:
6246 // The return type will be eliminated later.
6247 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type)
6248 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
6249 << SourceRange(D.getIdentifierLoc());
6252 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
6253 if (FTI.TypeQuals != 0 && !D.isInvalidType()) {
6254 if (FTI.TypeQuals & Qualifiers::Const)
6255 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
6256 << "const" << SourceRange(D.getIdentifierLoc());
6257 if (FTI.TypeQuals & Qualifiers::Volatile)
6258 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
6259 << "volatile" << SourceRange(D.getIdentifierLoc());
6260 if (FTI.TypeQuals & Qualifiers::Restrict)
6261 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
6262 << "restrict" << SourceRange(D.getIdentifierLoc());
6266 // C++0x [class.dtor]p2:
6267 // A destructor shall not be declared with a ref-qualifier.
6268 if (FTI.hasRefQualifier()) {
6269 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor)
6270 << FTI.RefQualifierIsLValueRef
6271 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
6275 // Make sure we don't have any parameters.
6276 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) {
6277 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params);
6279 // Delete the parameters.
6284 // Make sure the destructor isn't variadic.
6285 if (FTI.isVariadic) {
6286 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic);
6290 // Rebuild the function type "R" without any type qualifiers or
6291 // parameters (in case any of the errors above fired) and with
6292 // "void" as the return type, since destructors don't have return
6294 if (!D.isInvalidType())
6297 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
6298 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
6299 EPI.Variadic = false;
6301 EPI.RefQualifier = RQ_None;
6302 return Context.getFunctionType(Context.VoidTy, None, EPI);
6305 /// CheckConversionDeclarator - Called by ActOnDeclarator to check the
6306 /// well-formednes of the conversion function declarator @p D with
6307 /// type @p R. If there are any errors in the declarator, this routine
6308 /// will emit diagnostics and return true. Otherwise, it will return
6309 /// false. Either way, the type @p R will be updated to reflect a
6310 /// well-formed type for the conversion operator.
6311 void Sema::CheckConversionDeclarator(Declarator &D, QualType &R,
6313 // C++ [class.conv.fct]p1:
6314 // Neither parameter types nor return type can be specified. The
6315 // type of a conversion function (8.3.5) is "function taking no
6316 // parameter returning conversion-type-id."
6317 if (SC == SC_Static) {
6318 if (!D.isInvalidType())
6319 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member)
6320 << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
6321 << D.getName().getSourceRange();
6326 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId);
6328 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
6329 // Conversion functions don't have return types, but the parser will
6330 // happily parse something like:
6333 // float operator bool();
6336 // The return type will be changed later anyway.
6337 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type)
6338 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
6339 << SourceRange(D.getIdentifierLoc());
6343 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
6345 // Make sure we don't have any parameters.
6346 if (Proto->getNumArgs() > 0) {
6347 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params);
6349 // Delete the parameters.
6350 D.getFunctionTypeInfo().freeArgs();
6352 } else if (Proto->isVariadic()) {
6353 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic);
6357 // Diagnose "&operator bool()" and other such nonsense. This
6358 // is actually a gcc extension which we don't support.
6359 if (Proto->getResultType() != ConvType) {
6360 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl)
6361 << Proto->getResultType();
6363 ConvType = Proto->getResultType();
6366 // C++ [class.conv.fct]p4:
6367 // The conversion-type-id shall not represent a function type nor
6369 if (ConvType->isArrayType()) {
6370 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array);
6371 ConvType = Context.getPointerType(ConvType);
6373 } else if (ConvType->isFunctionType()) {
6374 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function);
6375 ConvType = Context.getPointerType(ConvType);
6379 // Rebuild the function type "R" without any parameters (in case any
6380 // of the errors above fired) and with the conversion type as the
6382 if (D.isInvalidType())
6383 R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo());
6385 // C++0x explicit conversion operators.
6386 if (D.getDeclSpec().isExplicitSpecified())
6387 Diag(D.getDeclSpec().getExplicitSpecLoc(),
6388 getLangOpts().CPlusPlus11 ?
6389 diag::warn_cxx98_compat_explicit_conversion_functions :
6390 diag::ext_explicit_conversion_functions)
6391 << SourceRange(D.getDeclSpec().getExplicitSpecLoc());
6394 /// ActOnConversionDeclarator - Called by ActOnDeclarator to complete
6395 /// the declaration of the given C++ conversion function. This routine
6396 /// is responsible for recording the conversion function in the C++
6397 /// class, if possible.
6398 Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) {
6399 assert(Conversion && "Expected to receive a conversion function declaration");
6401 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext());
6403 // Make sure we aren't redeclaring the conversion function.
6404 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType());
6406 // C++ [class.conv.fct]p1:
6407 // [...] A conversion function is never used to convert a
6408 // (possibly cv-qualified) object to the (possibly cv-qualified)
6409 // same object type (or a reference to it), to a (possibly
6410 // cv-qualified) base class of that type (or a reference to it),
6411 // or to (possibly cv-qualified) void.
6412 // FIXME: Suppress this warning if the conversion function ends up being a
6413 // virtual function that overrides a virtual function in a base class.
6415 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
6416 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>())
6417 ConvType = ConvTypeRef->getPointeeType();
6418 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared &&
6419 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization)
6420 /* Suppress diagnostics for instantiations. */;
6421 else if (ConvType->isRecordType()) {
6422 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType();
6423 if (ConvType == ClassType)
6424 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used)
6426 else if (IsDerivedFrom(ClassType, ConvType))
6427 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used)
6428 << ClassType << ConvType;
6429 } else if (ConvType->isVoidType()) {
6430 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used)
6431 << ClassType << ConvType;
6434 if (FunctionTemplateDecl *ConversionTemplate
6435 = Conversion->getDescribedFunctionTemplate())
6436 return ConversionTemplate;
6441 //===----------------------------------------------------------------------===//
6442 // Namespace Handling
6443 //===----------------------------------------------------------------------===//
6445 /// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is
6447 static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc,
6449 IdentifierInfo *II, bool *IsInline,
6450 NamespaceDecl *PrevNS) {
6451 assert(*IsInline != PrevNS->isInline());
6453 // HACK: Work around a bug in libstdc++4.6's <atomic>, where
6454 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as
6455 // inline namespaces, with the intention of bringing names into namespace std.
6457 // We support this just well enough to get that case working; this is not
6458 // sufficient to support reopening namespaces as inline in general.
6459 if (*IsInline && II && II->getName().startswith("__atomic") &&
6460 S.getSourceManager().isInSystemHeader(Loc)) {
6461 // Mark all prior declarations of the namespace as inline.
6462 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS;
6463 NS = NS->getPreviousDecl())
6464 NS->setInline(*IsInline);
6465 // Patch up the lookup table for the containing namespace. This isn't really
6466 // correct, but it's good enough for this particular case.
6467 for (DeclContext::decl_iterator I = PrevNS->decls_begin(),
6468 E = PrevNS->decls_end(); I != E; ++I)
6469 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I))
6470 PrevNS->getParent()->makeDeclVisibleInContext(ND);
6474 if (PrevNS->isInline())
6475 // The user probably just forgot the 'inline', so suggest that it
6477 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline)
6478 << FixItHint::CreateInsertion(KeywordLoc, "inline ");
6480 S.Diag(Loc, diag::err_inline_namespace_mismatch)
6483 S.Diag(PrevNS->getLocation(), diag::note_previous_definition);
6484 *IsInline = PrevNS->isInline();
6487 /// ActOnStartNamespaceDef - This is called at the start of a namespace
6489 Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope,
6490 SourceLocation InlineLoc,
6491 SourceLocation NamespaceLoc,
6492 SourceLocation IdentLoc,
6494 SourceLocation LBrace,
6495 AttributeList *AttrList) {
6496 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc;
6497 // For anonymous namespace, take the location of the left brace.
6498 SourceLocation Loc = II ? IdentLoc : LBrace;
6499 bool IsInline = InlineLoc.isValid();
6500 bool IsInvalid = false;
6502 bool AddToKnown = false;
6503 Scope *DeclRegionScope = NamespcScope->getParent();
6505 NamespaceDecl *PrevNS = 0;
6507 // C++ [namespace.def]p2:
6508 // The identifier in an original-namespace-definition shall not
6509 // have been previously defined in the declarative region in
6510 // which the original-namespace-definition appears. The
6511 // identifier in an original-namespace-definition is the name of
6512 // the namespace. Subsequently in that declarative region, it is
6513 // treated as an original-namespace-name.
6515 // Since namespace names are unique in their scope, and we don't
6516 // look through using directives, just look for any ordinary names.
6518 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member |
6519 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag |
6520 Decl::IDNS_Namespace;
6521 NamedDecl *PrevDecl = 0;
6522 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II);
6523 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E;
6525 if ((*I)->getIdentifierNamespace() & IDNS) {
6531 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl);
6534 // This is an extended namespace definition.
6535 if (IsInline != PrevNS->isInline())
6536 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II,
6538 } else if (PrevDecl) {
6539 // This is an invalid name redefinition.
6540 Diag(Loc, diag::err_redefinition_different_kind)
6542 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
6544 // Continue on to push Namespc as current DeclContext and return it.
6545 } else if (II->isStr("std") &&
6546 CurContext->getRedeclContext()->isTranslationUnit()) {
6547 // This is the first "real" definition of the namespace "std", so update
6548 // our cache of the "std" namespace to point at this definition.
6549 PrevNS = getStdNamespace();
6551 AddToKnown = !IsInline;
6553 // We've seen this namespace for the first time.
6554 AddToKnown = !IsInline;
6557 // Anonymous namespaces.
6559 // Determine whether the parent already has an anonymous namespace.
6560 DeclContext *Parent = CurContext->getRedeclContext();
6561 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
6562 PrevNS = TU->getAnonymousNamespace();
6564 NamespaceDecl *ND = cast<NamespaceDecl>(Parent);
6565 PrevNS = ND->getAnonymousNamespace();
6568 if (PrevNS && IsInline != PrevNS->isInline())
6569 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II,
6573 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline,
6574 StartLoc, Loc, II, PrevNS);
6576 Namespc->setInvalidDecl();
6578 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList);
6580 // FIXME: Should we be merging attributes?
6581 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>())
6582 PushNamespaceVisibilityAttr(Attr, Loc);
6585 StdNamespace = Namespc;
6587 KnownNamespaces[Namespc] = false;
6590 PushOnScopeChains(Namespc, DeclRegionScope);
6592 // Link the anonymous namespace into its parent.
6593 DeclContext *Parent = CurContext->getRedeclContext();
6594 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
6595 TU->setAnonymousNamespace(Namespc);
6597 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc);
6600 CurContext->addDecl(Namespc);
6602 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition
6603 // behaves as if it were replaced by
6604 // namespace unique { /* empty body */ }
6605 // using namespace unique;
6606 // namespace unique { namespace-body }
6607 // where all occurrences of 'unique' in a translation unit are
6608 // replaced by the same identifier and this identifier differs
6609 // from all other identifiers in the entire program.
6611 // We just create the namespace with an empty name and then add an
6612 // implicit using declaration, just like the standard suggests.
6614 // CodeGen enforces the "universally unique" aspect by giving all
6615 // declarations semantically contained within an anonymous
6616 // namespace internal linkage.
6619 UsingDirectiveDecl* UD
6620 = UsingDirectiveDecl::Create(Context, Parent,
6621 /* 'using' */ LBrace,
6622 /* 'namespace' */ SourceLocation(),
6623 /* qualifier */ NestedNameSpecifierLoc(),
6624 /* identifier */ SourceLocation(),
6626 /* Ancestor */ Parent);
6628 Parent->addDecl(UD);
6632 ActOnDocumentableDecl(Namespc);
6634 // Although we could have an invalid decl (i.e. the namespace name is a
6635 // redefinition), push it as current DeclContext and try to continue parsing.
6636 // FIXME: We should be able to push Namespc here, so that the each DeclContext
6637 // for the namespace has the declarations that showed up in that particular
6638 // namespace definition.
6639 PushDeclContext(NamespcScope, Namespc);
6643 /// getNamespaceDecl - Returns the namespace a decl represents. If the decl
6644 /// is a namespace alias, returns the namespace it points to.
6645 static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) {
6646 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D))
6647 return AD->getNamespace();
6648 return dyn_cast_or_null<NamespaceDecl>(D);
6651 /// ActOnFinishNamespaceDef - This callback is called after a namespace is
6652 /// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef.
6653 void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) {
6654 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl);
6655 assert(Namespc && "Invalid parameter, expected NamespaceDecl");
6656 Namespc->setRBraceLoc(RBrace);
6658 if (Namespc->hasAttr<VisibilityAttr>())
6659 PopPragmaVisibility(true, RBrace);
6662 CXXRecordDecl *Sema::getStdBadAlloc() const {
6663 return cast_or_null<CXXRecordDecl>(
6664 StdBadAlloc.get(Context.getExternalSource()));
6667 NamespaceDecl *Sema::getStdNamespace() const {
6668 return cast_or_null<NamespaceDecl>(
6669 StdNamespace.get(Context.getExternalSource()));
6672 /// \brief Retrieve the special "std" namespace, which may require us to
6673 /// implicitly define the namespace.
6674 NamespaceDecl *Sema::getOrCreateStdNamespace() {
6675 if (!StdNamespace) {
6676 // The "std" namespace has not yet been defined, so build one implicitly.
6677 StdNamespace = NamespaceDecl::Create(Context,
6678 Context.getTranslationUnitDecl(),
6680 SourceLocation(), SourceLocation(),
6681 &PP.getIdentifierTable().get("std"),
6683 getStdNamespace()->setImplicit(true);
6686 return getStdNamespace();
6689 bool Sema::isStdInitializerList(QualType Ty, QualType *Element) {
6690 assert(getLangOpts().CPlusPlus &&
6691 "Looking for std::initializer_list outside of C++.");
6693 // We're looking for implicit instantiations of
6694 // template <typename E> class std::initializer_list.
6696 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it.
6699 ClassTemplateDecl *Template = 0;
6700 const TemplateArgument *Arguments = 0;
6702 if (const RecordType *RT = Ty->getAs<RecordType>()) {
6704 ClassTemplateSpecializationDecl *Specialization =
6705 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl());
6706 if (!Specialization)
6709 Template = Specialization->getSpecializedTemplate();
6710 Arguments = Specialization->getTemplateArgs().data();
6711 } else if (const TemplateSpecializationType *TST =
6712 Ty->getAs<TemplateSpecializationType>()) {
6713 Template = dyn_cast_or_null<ClassTemplateDecl>(
6714 TST->getTemplateName().getAsTemplateDecl());
6715 Arguments = TST->getArgs();
6720 if (!StdInitializerList) {
6721 // Haven't recognized std::initializer_list yet, maybe this is it.
6722 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl();
6723 if (TemplateClass->getIdentifier() !=
6724 &PP.getIdentifierTable().get("initializer_list") ||
6725 !getStdNamespace()->InEnclosingNamespaceSetOf(
6726 TemplateClass->getDeclContext()))
6728 // This is a template called std::initializer_list, but is it the right
6730 TemplateParameterList *Params = Template->getTemplateParameters();
6731 if (Params->getMinRequiredArguments() != 1)
6733 if (!isa<TemplateTypeParmDecl>(Params->getParam(0)))
6736 // It's the right template.
6737 StdInitializerList = Template;
6740 if (Template != StdInitializerList)
6743 // This is an instance of std::initializer_list. Find the argument type.
6745 *Element = Arguments[0].getAsType();
6749 static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){
6750 NamespaceDecl *Std = S.getStdNamespace();
6752 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
6756 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"),
6757 Loc, Sema::LookupOrdinaryName);
6758 if (!S.LookupQualifiedName(Result, Std)) {
6759 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
6762 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>();
6764 Result.suppressDiagnostics();
6765 // We found something weird. Complain about the first thing we found.
6766 NamedDecl *Found = *Result.begin();
6767 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list);
6771 // We found some template called std::initializer_list. Now verify that it's
6773 TemplateParameterList *Params = Template->getTemplateParameters();
6774 if (Params->getMinRequiredArguments() != 1 ||
6775 !isa<TemplateTypeParmDecl>(Params->getParam(0))) {
6776 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list);
6783 QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) {
6784 if (!StdInitializerList) {
6785 StdInitializerList = LookupStdInitializerList(*this, Loc);
6786 if (!StdInitializerList)
6790 TemplateArgumentListInfo Args(Loc, Loc);
6791 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element),
6792 Context.getTrivialTypeSourceInfo(Element,
6794 return Context.getCanonicalType(
6795 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args));
6798 bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) {
6799 // C++ [dcl.init.list]p2:
6800 // A constructor is an initializer-list constructor if its first parameter
6801 // is of type std::initializer_list<E> or reference to possibly cv-qualified
6802 // std::initializer_list<E> for some type E, and either there are no other
6803 // parameters or else all other parameters have default arguments.
6804 if (Ctor->getNumParams() < 1 ||
6805 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg()))
6808 QualType ArgType = Ctor->getParamDecl(0)->getType();
6809 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>())
6810 ArgType = RT->getPointeeType().getUnqualifiedType();
6812 return isStdInitializerList(ArgType, 0);
6815 /// \brief Determine whether a using statement is in a context where it will be
6816 /// apply in all contexts.
6817 static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) {
6818 switch (CurContext->getDeclKind()) {
6819 case Decl::TranslationUnit:
6821 case Decl::LinkageSpec:
6822 return IsUsingDirectiveInToplevelContext(CurContext->getParent());
6830 // Callback to only accept typo corrections that are namespaces.
6831 class NamespaceValidatorCCC : public CorrectionCandidateCallback {
6833 bool ValidateCandidate(const TypoCorrection &candidate) LLVM_OVERRIDE {
6834 if (NamedDecl *ND = candidate.getCorrectionDecl())
6835 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND);
6842 static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc,
6844 SourceLocation IdentLoc,
6845 IdentifierInfo *Ident) {
6846 NamespaceValidatorCCC Validator;
6848 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(),
6849 R.getLookupKind(), Sc, &SS,
6851 if (DeclContext *DC = S.computeDeclContext(SS, false)) {
6852 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts()));
6853 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
6854 Ident->getName().equals(CorrectedStr);
6855 S.diagnoseTypo(Corrected,
6856 S.PDiag(diag::err_using_directive_member_suggest)
6857 << Ident << DC << DroppedSpecifier << SS.getRange(),
6858 S.PDiag(diag::note_namespace_defined_here));
6860 S.diagnoseTypo(Corrected,
6861 S.PDiag(diag::err_using_directive_suggest) << Ident,
6862 S.PDiag(diag::note_namespace_defined_here));
6864 R.addDecl(Corrected.getCorrectionDecl());
6870 Decl *Sema::ActOnUsingDirective(Scope *S,
6871 SourceLocation UsingLoc,
6872 SourceLocation NamespcLoc,
6874 SourceLocation IdentLoc,
6875 IdentifierInfo *NamespcName,
6876 AttributeList *AttrList) {
6877 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
6878 assert(NamespcName && "Invalid NamespcName.");
6879 assert(IdentLoc.isValid() && "Invalid NamespceName location.");
6881 // This can only happen along a recovery path.
6882 while (S->getFlags() & Scope::TemplateParamScope)
6884 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
6886 UsingDirectiveDecl *UDir = 0;
6887 NestedNameSpecifier *Qualifier = 0;
6889 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
6891 // Lookup namespace name.
6892 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName);
6893 LookupParsedName(R, S, &SS);
6894 if (R.isAmbiguous())
6899 // Allow "using namespace std;" or "using namespace ::std;" even if
6900 // "std" hasn't been defined yet, for GCC compatibility.
6901 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) &&
6902 NamespcName->isStr("std")) {
6903 Diag(IdentLoc, diag::ext_using_undefined_std);
6904 R.addDecl(getOrCreateStdNamespace());
6907 // Otherwise, attempt typo correction.
6908 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName);
6912 NamedDecl *Named = R.getFoundDecl();
6913 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named))
6914 && "expected namespace decl");
6915 // C++ [namespace.udir]p1:
6916 // A using-directive specifies that the names in the nominated
6917 // namespace can be used in the scope in which the
6918 // using-directive appears after the using-directive. During
6919 // unqualified name lookup (3.4.1), the names appear as if they
6920 // were declared in the nearest enclosing namespace which
6921 // contains both the using-directive and the nominated
6922 // namespace. [Note: in this context, "contains" means "contains
6923 // directly or indirectly". ]
6925 // Find enclosing context containing both using-directive and
6926 // nominated namespace.
6927 NamespaceDecl *NS = getNamespaceDecl(Named);
6928 DeclContext *CommonAncestor = cast<DeclContext>(NS);
6929 while (CommonAncestor && !CommonAncestor->Encloses(CurContext))
6930 CommonAncestor = CommonAncestor->getParent();
6932 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc,
6933 SS.getWithLocInContext(Context),
6934 IdentLoc, Named, CommonAncestor);
6936 if (IsUsingDirectiveInToplevelContext(CurContext) &&
6937 !SourceMgr.isInMainFile(SourceMgr.getExpansionLoc(IdentLoc))) {
6938 Diag(IdentLoc, diag::warn_using_directive_in_header);
6941 PushUsingDirective(S, UDir);
6943 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
6947 ProcessDeclAttributeList(S, UDir, AttrList);
6952 void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) {
6953 // If the scope has an associated entity and the using directive is at
6954 // namespace or translation unit scope, add the UsingDirectiveDecl into
6955 // its lookup structure so qualified name lookup can find it.
6956 DeclContext *Ctx = S->getEntity();
6957 if (Ctx && !Ctx->isFunctionOrMethod())
6960 // Otherwise, it is at block sope. The using-directives will affect lookup
6961 // only to the end of the scope.
6962 S->PushUsingDirective(UDir);
6966 Decl *Sema::ActOnUsingDeclaration(Scope *S,
6968 bool HasUsingKeyword,
6969 SourceLocation UsingLoc,
6971 UnqualifiedId &Name,
6972 AttributeList *AttrList,
6973 bool HasTypenameKeyword,
6974 SourceLocation TypenameLoc) {
6975 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
6977 switch (Name.getKind()) {
6978 case UnqualifiedId::IK_ImplicitSelfParam:
6979 case UnqualifiedId::IK_Identifier:
6980 case UnqualifiedId::IK_OperatorFunctionId:
6981 case UnqualifiedId::IK_LiteralOperatorId:
6982 case UnqualifiedId::IK_ConversionFunctionId:
6985 case UnqualifiedId::IK_ConstructorName:
6986 case UnqualifiedId::IK_ConstructorTemplateId:
6987 // C++11 inheriting constructors.
6988 Diag(Name.getLocStart(),
6989 getLangOpts().CPlusPlus11 ?
6990 diag::warn_cxx98_compat_using_decl_constructor :
6991 diag::err_using_decl_constructor)
6994 if (getLangOpts().CPlusPlus11) break;
6998 case UnqualifiedId::IK_DestructorName:
6999 Diag(Name.getLocStart(), diag::err_using_decl_destructor)
7003 case UnqualifiedId::IK_TemplateId:
7004 Diag(Name.getLocStart(), diag::err_using_decl_template_id)
7005 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc);
7009 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name);
7010 DeclarationName TargetName = TargetNameInfo.getName();
7014 // Warn about access declarations.
7015 if (!HasUsingKeyword) {
7016 Diag(Name.getLocStart(),
7017 getLangOpts().CPlusPlus11 ? diag::err_access_decl
7018 : diag::warn_access_decl_deprecated)
7019 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using ");
7022 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) ||
7023 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration))
7026 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS,
7027 TargetNameInfo, AttrList,
7028 /* IsInstantiation */ false,
7029 HasTypenameKeyword, TypenameLoc);
7031 PushOnScopeChains(UD, S, /*AddToContext*/ false);
7036 /// \brief Determine whether a using declaration considers the given
7037 /// declarations as "equivalent", e.g., if they are redeclarations of
7038 /// the same entity or are both typedefs of the same type.
7040 IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2) {
7041 if (D1->getCanonicalDecl() == D2->getCanonicalDecl())
7044 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1))
7045 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2))
7046 return Context.hasSameType(TD1->getUnderlyingType(),
7047 TD2->getUnderlyingType());
7053 /// Determines whether to create a using shadow decl for a particular
7054 /// decl, given the set of decls existing prior to this using lookup.
7055 bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig,
7056 const LookupResult &Previous,
7057 UsingShadowDecl *&PrevShadow) {
7058 // Diagnose finding a decl which is not from a base class of the
7059 // current class. We do this now because there are cases where this
7060 // function will silently decide not to build a shadow decl, which
7061 // will pre-empt further diagnostics.
7063 // We don't need to do this in C++0x because we do the check once on
7066 // FIXME: diagnose the following if we care enough:
7067 // struct A { int foo; };
7068 // struct B : A { using A::foo; };
7069 // template <class T> struct C : A {};
7070 // template <class T> struct D : C<T> { using B::foo; } // <---
7071 // This is invalid (during instantiation) in C++03 because B::foo
7072 // resolves to the using decl in B, which is not a base class of D<T>.
7073 // We can't diagnose it immediately because C<T> is an unknown
7074 // specialization. The UsingShadowDecl in D<T> then points directly
7075 // to A::foo, which will look well-formed when we instantiate.
7076 // The right solution is to not collapse the shadow-decl chain.
7077 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) {
7078 DeclContext *OrigDC = Orig->getDeclContext();
7080 // Handle enums and anonymous structs.
7081 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent();
7082 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC);
7083 while (OrigRec->isAnonymousStructOrUnion())
7084 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext());
7086 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) {
7087 if (OrigDC == CurContext) {
7088 Diag(Using->getLocation(),
7089 diag::err_using_decl_nested_name_specifier_is_current_class)
7090 << Using->getQualifierLoc().getSourceRange();
7091 Diag(Orig->getLocation(), diag::note_using_decl_target);
7095 Diag(Using->getQualifierLoc().getBeginLoc(),
7096 diag::err_using_decl_nested_name_specifier_is_not_base_class)
7097 << Using->getQualifier()
7098 << cast<CXXRecordDecl>(CurContext)
7099 << Using->getQualifierLoc().getSourceRange();
7100 Diag(Orig->getLocation(), diag::note_using_decl_target);
7105 if (Previous.empty()) return false;
7107 NamedDecl *Target = Orig;
7108 if (isa<UsingShadowDecl>(Target))
7109 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
7111 // If the target happens to be one of the previous declarations, we
7112 // don't have a conflict.
7114 // FIXME: but we might be increasing its access, in which case we
7115 // should redeclare it.
7116 NamedDecl *NonTag = 0, *Tag = 0;
7117 bool FoundEquivalentDecl = false;
7118 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
7120 NamedDecl *D = (*I)->getUnderlyingDecl();
7121 if (IsEquivalentForUsingDecl(Context, D, Target)) {
7122 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(*I))
7123 PrevShadow = Shadow;
7124 FoundEquivalentDecl = true;
7127 (isa<TagDecl>(D) ? Tag : NonTag) = D;
7130 if (FoundEquivalentDecl)
7133 if (Target->isFunctionOrFunctionTemplate()) {
7135 if (isa<FunctionTemplateDecl>(Target))
7136 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl();
7138 FD = cast<FunctionDecl>(Target);
7140 NamedDecl *OldDecl = 0;
7141 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) {
7145 case Ovl_NonFunction:
7146 Diag(Using->getLocation(), diag::err_using_decl_conflict);
7149 // We found a decl with the exact signature.
7151 // If we're in a record, we want to hide the target, so we
7152 // return true (without a diagnostic) to tell the caller not to
7153 // build a shadow decl.
7154 if (CurContext->isRecord())
7157 // If we're not in a record, this is an error.
7158 Diag(Using->getLocation(), diag::err_using_decl_conflict);
7162 Diag(Target->getLocation(), diag::note_using_decl_target);
7163 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict);
7167 // Target is not a function.
7169 if (isa<TagDecl>(Target)) {
7170 // No conflict between a tag and a non-tag.
7171 if (!Tag) return false;
7173 Diag(Using->getLocation(), diag::err_using_decl_conflict);
7174 Diag(Target->getLocation(), diag::note_using_decl_target);
7175 Diag(Tag->getLocation(), diag::note_using_decl_conflict);
7179 // No conflict between a tag and a non-tag.
7180 if (!NonTag) return false;
7182 Diag(Using->getLocation(), diag::err_using_decl_conflict);
7183 Diag(Target->getLocation(), diag::note_using_decl_target);
7184 Diag(NonTag->getLocation(), diag::note_using_decl_conflict);
7188 /// Builds a shadow declaration corresponding to a 'using' declaration.
7189 UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S,
7192 UsingShadowDecl *PrevDecl) {
7194 // If we resolved to another shadow declaration, just coalesce them.
7195 NamedDecl *Target = Orig;
7196 if (isa<UsingShadowDecl>(Target)) {
7197 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
7198 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration");
7201 UsingShadowDecl *Shadow
7202 = UsingShadowDecl::Create(Context, CurContext,
7203 UD->getLocation(), UD, Target);
7204 UD->addShadowDecl(Shadow);
7206 Shadow->setAccess(UD->getAccess());
7207 if (Orig->isInvalidDecl() || UD->isInvalidDecl())
7208 Shadow->setInvalidDecl();
7210 Shadow->setPreviousDecl(PrevDecl);
7213 PushOnScopeChains(Shadow, S);
7215 CurContext->addDecl(Shadow);
7221 /// Hides a using shadow declaration. This is required by the current
7222 /// using-decl implementation when a resolvable using declaration in a
7223 /// class is followed by a declaration which would hide or override
7224 /// one or more of the using decl's targets; for example:
7226 /// struct Base { void foo(int); };
7227 /// struct Derived : Base {
7228 /// using Base::foo;
7232 /// The governing language is C++03 [namespace.udecl]p12:
7234 /// When a using-declaration brings names from a base class into a
7235 /// derived class scope, member functions in the derived class
7236 /// override and/or hide member functions with the same name and
7237 /// parameter types in a base class (rather than conflicting).
7239 /// There are two ways to implement this:
7240 /// (1) optimistically create shadow decls when they're not hidden
7241 /// by existing declarations, or
7242 /// (2) don't create any shadow decls (or at least don't make them
7243 /// visible) until we've fully parsed/instantiated the class.
7244 /// The problem with (1) is that we might have to retroactively remove
7245 /// a shadow decl, which requires several O(n) operations because the
7246 /// decl structures are (very reasonably) not designed for removal.
7247 /// (2) avoids this but is very fiddly and phase-dependent.
7248 void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) {
7249 if (Shadow->getDeclName().getNameKind() ==
7250 DeclarationName::CXXConversionFunctionName)
7251 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow);
7253 // Remove it from the DeclContext...
7254 Shadow->getDeclContext()->removeDecl(Shadow);
7256 // ...and the scope, if applicable...
7258 S->RemoveDecl(Shadow);
7259 IdResolver.RemoveDecl(Shadow);
7262 // ...and the using decl.
7263 Shadow->getUsingDecl()->removeShadowDecl(Shadow);
7265 // TODO: complain somehow if Shadow was used. It shouldn't
7266 // be possible for this to happen, because...?
7270 class UsingValidatorCCC : public CorrectionCandidateCallback {
7272 UsingValidatorCCC(bool HasTypenameKeyword, bool IsInstantiation,
7274 : HasTypenameKeyword(HasTypenameKeyword),
7275 IsInstantiation(IsInstantiation), RequireMember(RequireMember) {}
7277 bool ValidateCandidate(const TypoCorrection &Candidate) LLVM_OVERRIDE {
7278 NamedDecl *ND = Candidate.getCorrectionDecl();
7280 // Keywords are not valid here.
7281 if (!ND || isa<NamespaceDecl>(ND))
7284 if (RequireMember && !isa<FieldDecl>(ND) && !isa<CXXMethodDecl>(ND) &&
7288 // Completely unqualified names are invalid for a 'using' declaration.
7289 if (Candidate.WillReplaceSpecifier() && !Candidate.getCorrectionSpecifier())
7292 if (isa<TypeDecl>(ND))
7293 return HasTypenameKeyword || !IsInstantiation;
7295 return !HasTypenameKeyword;
7299 bool HasTypenameKeyword;
7300 bool IsInstantiation;
7303 } // end anonymous namespace
7305 /// Builds a using declaration.
7307 /// \param IsInstantiation - Whether this call arises from an
7308 /// instantiation of an unresolved using declaration. We treat
7309 /// the lookup differently for these declarations.
7310 NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
7311 SourceLocation UsingLoc,
7313 const DeclarationNameInfo &NameInfo,
7314 AttributeList *AttrList,
7315 bool IsInstantiation,
7316 bool HasTypenameKeyword,
7317 SourceLocation TypenameLoc) {
7318 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
7319 SourceLocation IdentLoc = NameInfo.getLoc();
7320 assert(IdentLoc.isValid() && "Invalid TargetName location.");
7322 // FIXME: We ignore attributes for now.
7325 Diag(IdentLoc, diag::err_using_requires_qualname);
7329 // Do the redeclaration lookup in the current scope.
7330 LookupResult Previous(*this, NameInfo, LookupUsingDeclName,
7332 Previous.setHideTags(false);
7334 LookupName(Previous, S);
7336 // It is really dumb that we have to do this.
7337 LookupResult::Filter F = Previous.makeFilter();
7338 while (F.hasNext()) {
7339 NamedDecl *D = F.next();
7340 if (!isDeclInScope(D, CurContext, S))
7345 assert(IsInstantiation && "no scope in non-instantiation");
7346 assert(CurContext->isRecord() && "scope not record in instantiation");
7347 LookupQualifiedName(Previous, CurContext);
7350 // Check for invalid redeclarations.
7351 if (CheckUsingDeclRedeclaration(UsingLoc, HasTypenameKeyword,
7352 SS, IdentLoc, Previous))
7355 // Check for bad qualifiers.
7356 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc))
7359 DeclContext *LookupContext = computeDeclContext(SS);
7361 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
7362 if (!LookupContext) {
7363 if (HasTypenameKeyword) {
7364 // FIXME: not all declaration name kinds are legal here
7365 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext,
7366 UsingLoc, TypenameLoc,
7368 IdentLoc, NameInfo.getName());
7370 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc,
7371 QualifierLoc, NameInfo);
7374 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc,
7375 NameInfo, HasTypenameKeyword);
7378 CurContext->addDecl(D);
7380 if (!LookupContext) return D;
7381 UsingDecl *UD = cast<UsingDecl>(D);
7383 if (RequireCompleteDeclContext(SS, LookupContext)) {
7384 UD->setInvalidDecl();
7388 // The normal rules do not apply to inheriting constructor declarations.
7389 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) {
7390 if (CheckInheritingConstructorUsingDecl(UD))
7391 UD->setInvalidDecl();
7395 // Otherwise, look up the target name.
7397 LookupResult R(*this, NameInfo, LookupOrdinaryName);
7399 // Unlike most lookups, we don't always want to hide tag
7400 // declarations: tag names are visible through the using declaration
7401 // even if hidden by ordinary names, *except* in a dependent context
7402 // where it's important for the sanity of two-phase lookup.
7403 if (!IsInstantiation)
7404 R.setHideTags(false);
7406 // For the purposes of this lookup, we have a base object type
7407 // equal to that of the current context.
7408 if (CurContext->isRecord()) {
7409 R.setBaseObjectType(
7410 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)));
7413 LookupQualifiedName(R, LookupContext);
7415 // Try to correct typos if possible.
7417 UsingValidatorCCC CCC(HasTypenameKeyword, IsInstantiation,
7418 CurContext->isRecord());
7419 if (TypoCorrection Corrected = CorrectTypo(R.getLookupNameInfo(),
7420 R.getLookupKind(), S, &SS, CCC)){
7421 // We reject any correction for which ND would be NULL.
7422 NamedDecl *ND = Corrected.getCorrectionDecl();
7423 R.setLookupName(Corrected.getCorrection());
7425 // We reject candidates where DroppedSpecifier == true, hence the
7426 // literal '0' below.
7427 diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest)
7428 << NameInfo.getName() << LookupContext << 0
7431 Diag(IdentLoc, diag::err_no_member)
7432 << NameInfo.getName() << LookupContext << SS.getRange();
7433 UD->setInvalidDecl();
7438 if (R.isAmbiguous()) {
7439 UD->setInvalidDecl();
7443 if (HasTypenameKeyword) {
7444 // If we asked for a typename and got a non-type decl, error out.
7445 if (!R.getAsSingle<TypeDecl>()) {
7446 Diag(IdentLoc, diag::err_using_typename_non_type);
7447 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
7448 Diag((*I)->getUnderlyingDecl()->getLocation(),
7449 diag::note_using_decl_target);
7450 UD->setInvalidDecl();
7454 // If we asked for a non-typename and we got a type, error out,
7455 // but only if this is an instantiation of an unresolved using
7456 // decl. Otherwise just silently find the type name.
7457 if (IsInstantiation && R.getAsSingle<TypeDecl>()) {
7458 Diag(IdentLoc, diag::err_using_dependent_value_is_type);
7459 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target);
7460 UD->setInvalidDecl();
7465 // C++0x N2914 [namespace.udecl]p6:
7466 // A using-declaration shall not name a namespace.
7467 if (R.getAsSingle<NamespaceDecl>()) {
7468 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace)
7470 UD->setInvalidDecl();
7474 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
7475 UsingShadowDecl *PrevDecl = 0;
7476 if (!CheckUsingShadowDecl(UD, *I, Previous, PrevDecl))
7477 BuildUsingShadowDecl(S, UD, *I, PrevDecl);
7483 /// Additional checks for a using declaration referring to a constructor name.
7484 bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) {
7485 assert(!UD->hasTypename() && "expecting a constructor name");
7487 const Type *SourceType = UD->getQualifier()->getAsType();
7488 assert(SourceType &&
7489 "Using decl naming constructor doesn't have type in scope spec.");
7490 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext);
7492 // Check whether the named type is a direct base class.
7493 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified();
7494 CXXRecordDecl::base_class_iterator BaseIt, BaseE;
7495 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end();
7496 BaseIt != BaseE; ++BaseIt) {
7497 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified();
7498 if (CanonicalSourceType == BaseType)
7500 if (BaseIt->getType()->isDependentType())
7504 if (BaseIt == BaseE) {
7505 // Did not find SourceType in the bases.
7506 Diag(UD->getUsingLoc(),
7507 diag::err_using_decl_constructor_not_in_direct_base)
7508 << UD->getNameInfo().getSourceRange()
7509 << QualType(SourceType, 0) << TargetClass;
7513 if (!CurContext->isDependentContext())
7514 BaseIt->setInheritConstructors();
7519 /// Checks that the given using declaration is not an invalid
7520 /// redeclaration. Note that this is checking only for the using decl
7521 /// itself, not for any ill-formedness among the UsingShadowDecls.
7522 bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
7523 bool HasTypenameKeyword,
7524 const CXXScopeSpec &SS,
7525 SourceLocation NameLoc,
7526 const LookupResult &Prev) {
7527 // C++03 [namespace.udecl]p8:
7528 // C++0x [namespace.udecl]p10:
7529 // A using-declaration is a declaration and can therefore be used
7530 // repeatedly where (and only where) multiple declarations are
7533 // That's in non-member contexts.
7534 if (!CurContext->getRedeclContext()->isRecord())
7537 NestedNameSpecifier *Qual
7538 = static_cast<NestedNameSpecifier*>(SS.getScopeRep());
7540 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) {
7544 NestedNameSpecifier *DQual;
7545 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) {
7546 DTypename = UD->hasTypename();
7547 DQual = UD->getQualifier();
7548 } else if (UnresolvedUsingValueDecl *UD
7549 = dyn_cast<UnresolvedUsingValueDecl>(D)) {
7551 DQual = UD->getQualifier();
7552 } else if (UnresolvedUsingTypenameDecl *UD
7553 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
7555 DQual = UD->getQualifier();
7558 // using decls differ if one says 'typename' and the other doesn't.
7559 // FIXME: non-dependent using decls?
7560 if (HasTypenameKeyword != DTypename) continue;
7562 // using decls differ if they name different scopes (but note that
7563 // template instantiation can cause this check to trigger when it
7564 // didn't before instantiation).
7565 if (Context.getCanonicalNestedNameSpecifier(Qual) !=
7566 Context.getCanonicalNestedNameSpecifier(DQual))
7569 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange();
7570 Diag(D->getLocation(), diag::note_using_decl) << 1;
7578 /// Checks that the given nested-name qualifier used in a using decl
7579 /// in the current context is appropriately related to the current
7580 /// scope. If an error is found, diagnoses it and returns true.
7581 bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc,
7582 const CXXScopeSpec &SS,
7583 SourceLocation NameLoc) {
7584 DeclContext *NamedContext = computeDeclContext(SS);
7586 if (!CurContext->isRecord()) {
7587 // C++03 [namespace.udecl]p3:
7588 // C++0x [namespace.udecl]p8:
7589 // A using-declaration for a class member shall be a member-declaration.
7591 // If we weren't able to compute a valid scope, it must be a
7592 // dependent class scope.
7593 if (!NamedContext || NamedContext->isRecord()) {
7594 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member)
7599 // Otherwise, everything is known to be fine.
7603 // The current scope is a record.
7605 // If the named context is dependent, we can't decide much.
7606 if (!NamedContext) {
7607 // FIXME: in C++0x, we can diagnose if we can prove that the
7608 // nested-name-specifier does not refer to a base class, which is
7609 // still possible in some cases.
7611 // Otherwise we have to conservatively report that things might be
7616 if (!NamedContext->isRecord()) {
7617 // Ideally this would point at the last name in the specifier,
7618 // but we don't have that level of source info.
7619 Diag(SS.getRange().getBegin(),
7620 diag::err_using_decl_nested_name_specifier_is_not_class)
7621 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange();
7625 if (!NamedContext->isDependentContext() &&
7626 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext))
7629 if (getLangOpts().CPlusPlus11) {
7630 // C++0x [namespace.udecl]p3:
7631 // In a using-declaration used as a member-declaration, the
7632 // nested-name-specifier shall name a base class of the class
7635 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(
7636 cast<CXXRecordDecl>(NamedContext))) {
7637 if (CurContext == NamedContext) {
7639 diag::err_using_decl_nested_name_specifier_is_current_class)
7644 Diag(SS.getRange().getBegin(),
7645 diag::err_using_decl_nested_name_specifier_is_not_base_class)
7646 << (NestedNameSpecifier*) SS.getScopeRep()
7647 << cast<CXXRecordDecl>(CurContext)
7655 // C++03 [namespace.udecl]p4:
7656 // A using-declaration used as a member-declaration shall refer
7657 // to a member of a base class of the class being defined [etc.].
7659 // Salient point: SS doesn't have to name a base class as long as
7660 // lookup only finds members from base classes. Therefore we can
7661 // diagnose here only if we can prove that that can't happen,
7662 // i.e. if the class hierarchies provably don't intersect.
7664 // TODO: it would be nice if "definitely valid" results were cached
7665 // in the UsingDecl and UsingShadowDecl so that these checks didn't
7666 // need to be repeated.
7669 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases;
7671 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) {
7672 UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
7673 Data->Bases.insert(Base);
7677 bool hasDependentBases(const CXXRecordDecl *Class) {
7678 return !Class->forallBases(collect, this);
7681 /// Returns true if the base is dependent or is one of the
7682 /// accumulated base classes.
7683 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) {
7684 UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
7685 return !Data->Bases.count(Base);
7688 bool mightShareBases(const CXXRecordDecl *Class) {
7689 return Bases.count(Class) || !Class->forallBases(doesNotContain, this);
7695 // Returns false if we find a dependent base.
7696 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext)))
7699 // Returns false if the class has a dependent base or if it or one
7700 // of its bases is present in the base set of the current context.
7701 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext)))
7704 Diag(SS.getRange().getBegin(),
7705 diag::err_using_decl_nested_name_specifier_is_not_base_class)
7706 << (NestedNameSpecifier*) SS.getScopeRep()
7707 << cast<CXXRecordDecl>(CurContext)
7713 Decl *Sema::ActOnAliasDeclaration(Scope *S,
7715 MultiTemplateParamsArg TemplateParamLists,
7716 SourceLocation UsingLoc,
7717 UnqualifiedId &Name,
7718 AttributeList *AttrList,
7720 // Skip up to the relevant declaration scope.
7721 while (S->getFlags() & Scope::TemplateParamScope)
7723 assert((S->getFlags() & Scope::DeclScope) &&
7724 "got alias-declaration outside of declaration scope");
7726 if (Type.isInvalid())
7729 bool Invalid = false;
7730 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name);
7731 TypeSourceInfo *TInfo = 0;
7732 GetTypeFromParser(Type.get(), &TInfo);
7734 if (DiagnoseClassNameShadow(CurContext, NameInfo))
7737 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo,
7738 UPPC_DeclarationType)) {
7740 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
7741 TInfo->getTypeLoc().getBeginLoc());
7744 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration);
7745 LookupName(Previous, S);
7747 // Warn about shadowing the name of a template parameter.
7748 if (Previous.isSingleResult() &&
7749 Previous.getFoundDecl()->isTemplateParameter()) {
7750 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl());
7754 assert(Name.Kind == UnqualifiedId::IK_Identifier &&
7755 "name in alias declaration must be an identifier");
7756 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc,
7758 Name.Identifier, TInfo);
7760 NewTD->setAccess(AS);
7763 NewTD->setInvalidDecl();
7765 ProcessDeclAttributeList(S, NewTD, AttrList);
7767 CheckTypedefForVariablyModifiedType(S, NewTD);
7768 Invalid |= NewTD->isInvalidDecl();
7770 bool Redeclaration = false;
7773 if (TemplateParamLists.size()) {
7774 TypeAliasTemplateDecl *OldDecl = 0;
7775 TemplateParameterList *OldTemplateParams = 0;
7777 if (TemplateParamLists.size() != 1) {
7778 Diag(UsingLoc, diag::err_alias_template_extra_headers)
7779 << SourceRange(TemplateParamLists[1]->getTemplateLoc(),
7780 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc());
7782 TemplateParameterList *TemplateParams = TemplateParamLists[0];
7784 // Only consider previous declarations in the same scope.
7785 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false,
7786 /*ExplicitInstantiationOrSpecialization*/false);
7787 if (!Previous.empty()) {
7788 Redeclaration = true;
7790 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>();
7791 if (!OldDecl && !Invalid) {
7792 Diag(UsingLoc, diag::err_redefinition_different_kind)
7795 NamedDecl *OldD = Previous.getRepresentativeDecl();
7796 if (OldD->getLocation().isValid())
7797 Diag(OldD->getLocation(), diag::note_previous_definition);
7802 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) {
7803 if (TemplateParameterListsAreEqual(TemplateParams,
7804 OldDecl->getTemplateParameters(),
7807 OldTemplateParams = OldDecl->getTemplateParameters();
7811 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl();
7813 !Context.hasSameType(OldTD->getUnderlyingType(),
7814 NewTD->getUnderlyingType())) {
7815 // FIXME: The C++0x standard does not clearly say this is ill-formed,
7816 // but we can't reasonably accept it.
7817 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef)
7818 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType();
7819 if (OldTD->getLocation().isValid())
7820 Diag(OldTD->getLocation(), diag::note_previous_definition);
7826 // Merge any previous default template arguments into our parameters,
7827 // and check the parameter list.
7828 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams,
7829 TPC_TypeAliasTemplate))
7832 TypeAliasTemplateDecl *NewDecl =
7833 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc,
7834 Name.Identifier, TemplateParams,
7837 NewDecl->setAccess(AS);
7840 NewDecl->setInvalidDecl();
7842 NewDecl->setPreviousDecl(OldDecl);
7846 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration);
7851 PushOnScopeChains(NewND, S);
7853 ActOnDocumentableDecl(NewND);
7857 Decl *Sema::ActOnNamespaceAliasDef(Scope *S,
7858 SourceLocation NamespaceLoc,
7859 SourceLocation AliasLoc,
7860 IdentifierInfo *Alias,
7862 SourceLocation IdentLoc,
7863 IdentifierInfo *Ident) {
7865 // Lookup the namespace name.
7866 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName);
7867 LookupParsedName(R, S, &SS);
7869 // Check if we have a previous declaration with the same name.
7871 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName,
7873 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S))
7877 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) {
7878 // We already have an alias with the same name that points to the same
7879 // namespace, so don't create a new one.
7880 // FIXME: At some point, we'll want to create the (redundant)
7881 // declaration to maintain better source information.
7882 if (!R.isAmbiguous() && !R.empty() &&
7883 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl())))
7887 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition :
7888 diag::err_redefinition_different_kind;
7889 Diag(AliasLoc, DiagID) << Alias;
7890 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
7894 if (R.isAmbiguous())
7898 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) {
7899 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
7904 NamespaceAliasDecl *AliasDecl =
7905 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc,
7906 Alias, SS.getWithLocInContext(Context),
7907 IdentLoc, R.getFoundDecl());
7909 PushOnScopeChains(AliasDecl, S);
7913 Sema::ImplicitExceptionSpecification
7914 Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc,
7915 CXXMethodDecl *MD) {
7916 CXXRecordDecl *ClassDecl = MD->getParent();
7918 // C++ [except.spec]p14:
7919 // An implicitly declared special member function (Clause 12) shall have an
7920 // exception-specification. [...]
7921 ImplicitExceptionSpecification ExceptSpec(*this);
7922 if (ClassDecl->isInvalidDecl())
7925 // Direct base-class constructors.
7926 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
7927 BEnd = ClassDecl->bases_end();
7929 if (B->isVirtual()) // Handled below.
7932 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
7933 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
7934 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
7935 // If this is a deleted function, add it anyway. This might be conformant
7936 // with the standard. This might not. I'm not sure. It might not matter.
7938 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
7942 // Virtual base-class constructors.
7943 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
7944 BEnd = ClassDecl->vbases_end();
7946 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
7947 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
7948 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
7949 // If this is a deleted function, add it anyway. This might be conformant
7950 // with the standard. This might not. I'm not sure. It might not matter.
7952 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
7956 // Field constructors.
7957 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
7958 FEnd = ClassDecl->field_end();
7960 if (F->hasInClassInitializer()) {
7961 if (Expr *E = F->getInClassInitializer())
7962 ExceptSpec.CalledExpr(E);
7963 else if (!F->isInvalidDecl())
7965 // If the brace-or-equal-initializer of a non-static data member
7966 // invokes a defaulted default constructor of its class or of an
7967 // enclosing class in a potentially evaluated subexpression, the
7968 // program is ill-formed.
7970 // This resolution is unworkable: the exception specification of the
7971 // default constructor can be needed in an unevaluated context, in
7972 // particular, in the operand of a noexcept-expression, and we can be
7973 // unable to compute an exception specification for an enclosed class.
7975 // We do not allow an in-class initializer to require the evaluation
7976 // of the exception specification for any in-class initializer whose
7977 // definition is not lexically complete.
7978 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD;
7979 } else if (const RecordType *RecordTy
7980 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) {
7981 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
7982 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl);
7983 // If this is a deleted function, add it anyway. This might be conformant
7984 // with the standard. This might not. I'm not sure. It might not matter.
7985 // In particular, the problem is that this function never gets called. It
7986 // might just be ill-formed because this function attempts to refer to
7987 // a deleted function here.
7989 ExceptSpec.CalledDecl(F->getLocation(), Constructor);
7996 Sema::ImplicitExceptionSpecification
7997 Sema::ComputeInheritingCtorExceptionSpec(CXXConstructorDecl *CD) {
7998 CXXRecordDecl *ClassDecl = CD->getParent();
8000 // C++ [except.spec]p14:
8001 // An inheriting constructor [...] shall have an exception-specification. [...]
8002 ImplicitExceptionSpecification ExceptSpec(*this);
8003 if (ClassDecl->isInvalidDecl())
8006 // Inherited constructor.
8007 const CXXConstructorDecl *InheritedCD = CD->getInheritedConstructor();
8008 const CXXRecordDecl *InheritedDecl = InheritedCD->getParent();
8009 // FIXME: Copying or moving the parameters could add extra exceptions to the
8010 // set, as could the default arguments for the inherited constructor. This
8011 // will be addressed when we implement the resolution of core issue 1351.
8012 ExceptSpec.CalledDecl(CD->getLocStart(), InheritedCD);
8014 // Direct base-class constructors.
8015 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
8016 BEnd = ClassDecl->bases_end();
8018 if (B->isVirtual()) // Handled below.
8021 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
8022 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
8023 if (BaseClassDecl == InheritedDecl)
8025 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
8027 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
8031 // Virtual base-class constructors.
8032 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
8033 BEnd = ClassDecl->vbases_end();
8035 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
8036 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
8037 if (BaseClassDecl == InheritedDecl)
8039 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
8041 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
8045 // Field constructors.
8046 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
8047 FEnd = ClassDecl->field_end();
8049 if (F->hasInClassInitializer()) {
8050 if (Expr *E = F->getInClassInitializer())
8051 ExceptSpec.CalledExpr(E);
8052 else if (!F->isInvalidDecl())
8053 Diag(CD->getLocation(),
8054 diag::err_in_class_initializer_references_def_ctor) << CD;
8055 } else if (const RecordType *RecordTy
8056 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) {
8057 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
8058 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl);
8060 ExceptSpec.CalledDecl(F->getLocation(), Constructor);
8068 /// RAII object to register a special member as being currently declared.
8069 struct DeclaringSpecialMember {
8071 Sema::SpecialMemberDecl D;
8072 bool WasAlreadyBeingDeclared;
8074 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM)
8075 : S(S), D(RD, CSM) {
8076 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D);
8077 if (WasAlreadyBeingDeclared)
8078 // This almost never happens, but if it does, ensure that our cache
8079 // doesn't contain a stale result.
8080 S.SpecialMemberCache.clear();
8082 // FIXME: Register a note to be produced if we encounter an error while
8083 // declaring the special member.
8085 ~DeclaringSpecialMember() {
8086 if (!WasAlreadyBeingDeclared)
8087 S.SpecialMembersBeingDeclared.erase(D);
8090 /// \brief Are we already trying to declare this special member?
8091 bool isAlreadyBeingDeclared() const {
8092 return WasAlreadyBeingDeclared;
8097 CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor(
8098 CXXRecordDecl *ClassDecl) {
8099 // C++ [class.ctor]p5:
8100 // A default constructor for a class X is a constructor of class X
8101 // that can be called without an argument. If there is no
8102 // user-declared constructor for class X, a default constructor is
8103 // implicitly declared. An implicitly-declared default constructor
8104 // is an inline public member of its class.
8105 assert(ClassDecl->needsImplicitDefaultConstructor() &&
8106 "Should not build implicit default constructor!");
8108 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor);
8109 if (DSM.isAlreadyBeingDeclared())
8112 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
8113 CXXDefaultConstructor,
8116 // Create the actual constructor declaration.
8117 CanQualType ClassType
8118 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
8119 SourceLocation ClassLoc = ClassDecl->getLocation();
8120 DeclarationName Name
8121 = Context.DeclarationNames.getCXXConstructorName(ClassType);
8122 DeclarationNameInfo NameInfo(Name, ClassLoc);
8123 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create(
8124 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0,
8125 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true,
8127 DefaultCon->setAccess(AS_public);
8128 DefaultCon->setDefaulted();
8129 DefaultCon->setImplicit();
8131 // Build an exception specification pointing back at this constructor.
8132 FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, DefaultCon);
8133 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, None, EPI));
8135 // We don't need to use SpecialMemberIsTrivial here; triviality for default
8136 // constructors is easy to compute.
8137 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor());
8139 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor))
8140 SetDeclDeleted(DefaultCon, ClassLoc);
8142 // Note that we have declared this constructor.
8143 ++ASTContext::NumImplicitDefaultConstructorsDeclared;
8145 if (Scope *S = getScopeForContext(ClassDecl))
8146 PushOnScopeChains(DefaultCon, S, false);
8147 ClassDecl->addDecl(DefaultCon);
8152 void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
8153 CXXConstructorDecl *Constructor) {
8154 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&
8155 !Constructor->doesThisDeclarationHaveABody() &&
8156 !Constructor->isDeleted()) &&
8157 "DefineImplicitDefaultConstructor - call it for implicit default ctor");
8159 CXXRecordDecl *ClassDecl = Constructor->getParent();
8160 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor");
8162 SynthesizedFunctionScope Scope(*this, Constructor);
8163 DiagnosticErrorTrap Trap(Diags);
8164 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) ||
8165 Trap.hasErrorOccurred()) {
8166 Diag(CurrentLocation, diag::note_member_synthesized_at)
8167 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl);
8168 Constructor->setInvalidDecl();
8172 SourceLocation Loc = Constructor->getLocation();
8173 Constructor->setBody(new (Context) CompoundStmt(Loc));
8175 Constructor->markUsed(Context);
8176 MarkVTableUsed(CurrentLocation, ClassDecl);
8178 if (ASTMutationListener *L = getASTMutationListener()) {
8179 L->CompletedImplicitDefinition(Constructor);
8182 DiagnoseUninitializedFields(*this, Constructor);
8185 void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) {
8186 // Perform any delayed checks on exception specifications.
8187 CheckDelayedMemberExceptionSpecs();
8191 /// Information on inheriting constructors to declare.
8192 class InheritingConstructorInfo {
8194 InheritingConstructorInfo(Sema &SemaRef, CXXRecordDecl *Derived)
8195 : SemaRef(SemaRef), Derived(Derived) {
8196 // Mark the constructors that we already have in the derived class.
8198 // C++11 [class.inhctor]p3: [...] a constructor is implicitly declared [...]
8199 // unless there is a user-declared constructor with the same signature in
8200 // the class where the using-declaration appears.
8201 visitAll(Derived, &InheritingConstructorInfo::noteDeclaredInDerived);
8204 void inheritAll(CXXRecordDecl *RD) {
8205 visitAll(RD, &InheritingConstructorInfo::inherit);
8209 /// Information about an inheriting constructor.
8210 struct InheritingConstructor {
8211 InheritingConstructor()
8212 : DeclaredInDerived(false), BaseCtor(0), DerivedCtor(0) {}
8214 /// If \c true, a constructor with this signature is already declared
8215 /// in the derived class.
8216 bool DeclaredInDerived;
8218 /// The constructor which is inherited.
8219 const CXXConstructorDecl *BaseCtor;
8221 /// The derived constructor we declared.
8222 CXXConstructorDecl *DerivedCtor;
8225 /// Inheriting constructors with a given canonical type. There can be at
8226 /// most one such non-template constructor, and any number of templated
8228 struct InheritingConstructorsForType {
8229 InheritingConstructor NonTemplate;
8230 SmallVector<std::pair<TemplateParameterList *, InheritingConstructor>, 4>
8233 InheritingConstructor &getEntry(Sema &S, const CXXConstructorDecl *Ctor) {
8234 if (FunctionTemplateDecl *FTD = Ctor->getDescribedFunctionTemplate()) {
8235 TemplateParameterList *ParamList = FTD->getTemplateParameters();
8236 for (unsigned I = 0, N = Templates.size(); I != N; ++I)
8237 if (S.TemplateParameterListsAreEqual(ParamList, Templates[I].first,
8238 false, S.TPL_TemplateMatch))
8239 return Templates[I].second;
8240 Templates.push_back(std::make_pair(ParamList, InheritingConstructor()));
8241 return Templates.back().second;
8248 /// Get or create the inheriting constructor record for a constructor.
8249 InheritingConstructor &getEntry(const CXXConstructorDecl *Ctor,
8250 QualType CtorType) {
8251 return Map[CtorType.getCanonicalType()->castAs<FunctionProtoType>()]
8252 .getEntry(SemaRef, Ctor);
8255 typedef void (InheritingConstructorInfo::*VisitFn)(const CXXConstructorDecl*);
8257 /// Process all constructors for a class.
8258 void visitAll(const CXXRecordDecl *RD, VisitFn Callback) {
8259 for (CXXRecordDecl::ctor_iterator CtorIt = RD->ctor_begin(),
8260 CtorE = RD->ctor_end();
8261 CtorIt != CtorE; ++CtorIt)
8262 (this->*Callback)(*CtorIt);
8263 for (CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl>
8264 I(RD->decls_begin()), E(RD->decls_end());
8266 const FunctionDecl *FD = (*I)->getTemplatedDecl();
8267 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD))
8268 (this->*Callback)(CD);
8272 /// Note that a constructor (or constructor template) was declared in Derived.
8273 void noteDeclaredInDerived(const CXXConstructorDecl *Ctor) {
8274 getEntry(Ctor, Ctor->getType()).DeclaredInDerived = true;
8277 /// Inherit a single constructor.
8278 void inherit(const CXXConstructorDecl *Ctor) {
8279 const FunctionProtoType *CtorType =
8280 Ctor->getType()->castAs<FunctionProtoType>();
8281 ArrayRef<QualType> ArgTypes(CtorType->getArgTypes());
8282 FunctionProtoType::ExtProtoInfo EPI = CtorType->getExtProtoInfo();
8284 SourceLocation UsingLoc = getUsingLoc(Ctor->getParent());
8286 // Core issue (no number yet): the ellipsis is always discarded.
8288 SemaRef.Diag(UsingLoc, diag::warn_using_decl_constructor_ellipsis);
8289 SemaRef.Diag(Ctor->getLocation(),
8290 diag::note_using_decl_constructor_ellipsis);
8291 EPI.Variadic = false;
8294 // Declare a constructor for each number of parameters.
8296 // C++11 [class.inhctor]p1:
8297 // The candidate set of inherited constructors from the class X named in
8298 // the using-declaration consists of [... modulo defects ...] for each
8299 // constructor or constructor template of X, the set of constructors or
8300 // constructor templates that results from omitting any ellipsis parameter
8301 // specification and successively omitting parameters with a default
8302 // argument from the end of the parameter-type-list
8303 unsigned MinParams = minParamsToInherit(Ctor);
8304 unsigned Params = Ctor->getNumParams();
8305 if (Params >= MinParams) {
8307 declareCtor(UsingLoc, Ctor,
8308 SemaRef.Context.getFunctionType(
8309 Ctor->getResultType(), ArgTypes.slice(0, Params), EPI));
8310 while (Params > MinParams &&
8311 Ctor->getParamDecl(--Params)->hasDefaultArg());
8315 /// Find the using-declaration which specified that we should inherit the
8316 /// constructors of \p Base.
8317 SourceLocation getUsingLoc(const CXXRecordDecl *Base) {
8318 // No fancy lookup required; just look for the base constructor name
8319 // directly within the derived class.
8320 ASTContext &Context = SemaRef.Context;
8321 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName(
8322 Context.getCanonicalType(Context.getRecordType(Base)));
8323 DeclContext::lookup_const_result Decls = Derived->lookup(Name);
8324 return Decls.empty() ? Derived->getLocation() : Decls[0]->getLocation();
8327 unsigned minParamsToInherit(const CXXConstructorDecl *Ctor) {
8328 // C++11 [class.inhctor]p3:
8329 // [F]or each constructor template in the candidate set of inherited
8330 // constructors, a constructor template is implicitly declared
8331 if (Ctor->getDescribedFunctionTemplate())
8334 // For each non-template constructor in the candidate set of inherited
8335 // constructors other than a constructor having no parameters or a
8336 // copy/move constructor having a single parameter, a constructor is
8337 // implicitly declared [...]
8338 if (Ctor->getNumParams() == 0)
8340 if (Ctor->isCopyOrMoveConstructor())
8343 // Per discussion on core reflector, never inherit a constructor which
8344 // would become a default, copy, or move constructor of Derived either.
8345 const ParmVarDecl *PD = Ctor->getParamDecl(0);
8346 const ReferenceType *RT = PD->getType()->getAs<ReferenceType>();
8347 return (RT && RT->getPointeeCXXRecordDecl() == Derived) ? 2 : 1;
8350 /// Declare a single inheriting constructor, inheriting the specified
8351 /// constructor, with the given type.
8352 void declareCtor(SourceLocation UsingLoc, const CXXConstructorDecl *BaseCtor,
8353 QualType DerivedType) {
8354 InheritingConstructor &Entry = getEntry(BaseCtor, DerivedType);
8356 // C++11 [class.inhctor]p3:
8357 // ... a constructor is implicitly declared with the same constructor
8358 // characteristics unless there is a user-declared constructor with
8359 // the same signature in the class where the using-declaration appears
8360 if (Entry.DeclaredInDerived)
8363 // C++11 [class.inhctor]p7:
8364 // If two using-declarations declare inheriting constructors with the
8365 // same signature, the program is ill-formed
8366 if (Entry.DerivedCtor) {
8367 if (BaseCtor->getParent() != Entry.BaseCtor->getParent()) {
8368 // Only diagnose this once per constructor.
8369 if (Entry.DerivedCtor->isInvalidDecl())
8371 Entry.DerivedCtor->setInvalidDecl();
8373 SemaRef.Diag(UsingLoc, diag::err_using_decl_constructor_conflict);
8374 SemaRef.Diag(BaseCtor->getLocation(),
8375 diag::note_using_decl_constructor_conflict_current_ctor);
8376 SemaRef.Diag(Entry.BaseCtor->getLocation(),
8377 diag::note_using_decl_constructor_conflict_previous_ctor);
8378 SemaRef.Diag(Entry.DerivedCtor->getLocation(),
8379 diag::note_using_decl_constructor_conflict_previous_using);
8381 // Core issue (no number): if the same inheriting constructor is
8382 // produced by multiple base class constructors from the same base
8383 // class, the inheriting constructor is defined as deleted.
8384 SemaRef.SetDeclDeleted(Entry.DerivedCtor, UsingLoc);
8390 ASTContext &Context = SemaRef.Context;
8391 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName(
8392 Context.getCanonicalType(Context.getRecordType(Derived)));
8393 DeclarationNameInfo NameInfo(Name, UsingLoc);
8395 TemplateParameterList *TemplateParams = 0;
8396 if (const FunctionTemplateDecl *FTD =
8397 BaseCtor->getDescribedFunctionTemplate()) {
8398 TemplateParams = FTD->getTemplateParameters();
8399 // We're reusing template parameters from a different DeclContext. This
8400 // is questionable at best, but works out because the template depth in
8401 // both places is guaranteed to be 0.
8402 // FIXME: Rebuild the template parameters in the new context, and
8403 // transform the function type to refer to them.
8406 // Build type source info pointing at the using-declaration. This is
8407 // required by template instantiation.
8408 TypeSourceInfo *TInfo =
8409 Context.getTrivialTypeSourceInfo(DerivedType, UsingLoc);
8410 FunctionProtoTypeLoc ProtoLoc =
8411 TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>();
8413 CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create(
8414 Context, Derived, UsingLoc, NameInfo, DerivedType,
8415 TInfo, BaseCtor->isExplicit(), /*Inline=*/true,
8416 /*ImplicitlyDeclared=*/true, /*Constexpr=*/BaseCtor->isConstexpr());
8418 // Build an unevaluated exception specification for this constructor.
8419 const FunctionProtoType *FPT = DerivedType->castAs<FunctionProtoType>();
8420 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
8421 EPI.ExceptionSpecType = EST_Unevaluated;
8422 EPI.ExceptionSpecDecl = DerivedCtor;
8423 DerivedCtor->setType(Context.getFunctionType(FPT->getResultType(),
8424 FPT->getArgTypes(), EPI));
8426 // Build the parameter declarations.
8427 SmallVector<ParmVarDecl *, 16> ParamDecls;
8428 for (unsigned I = 0, N = FPT->getNumArgs(); I != N; ++I) {
8429 TypeSourceInfo *TInfo =
8430 Context.getTrivialTypeSourceInfo(FPT->getArgType(I), UsingLoc);
8431 ParmVarDecl *PD = ParmVarDecl::Create(
8432 Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/0,
8433 FPT->getArgType(I), TInfo, SC_None, /*DefaultArg=*/0);
8434 PD->setScopeInfo(0, I);
8436 ParamDecls.push_back(PD);
8437 ProtoLoc.setArg(I, PD);
8440 // Set up the new constructor.
8441 DerivedCtor->setAccess(BaseCtor->getAccess());
8442 DerivedCtor->setParams(ParamDecls);
8443 DerivedCtor->setInheritedConstructor(BaseCtor);
8444 if (BaseCtor->isDeleted())
8445 SemaRef.SetDeclDeleted(DerivedCtor, UsingLoc);
8447 // If this is a constructor template, build the template declaration.
8448 if (TemplateParams) {
8449 FunctionTemplateDecl *DerivedTemplate =
8450 FunctionTemplateDecl::Create(SemaRef.Context, Derived, UsingLoc, Name,
8451 TemplateParams, DerivedCtor);
8452 DerivedTemplate->setAccess(BaseCtor->getAccess());
8453 DerivedCtor->setDescribedFunctionTemplate(DerivedTemplate);
8454 Derived->addDecl(DerivedTemplate);
8456 Derived->addDecl(DerivedCtor);
8459 Entry.BaseCtor = BaseCtor;
8460 Entry.DerivedCtor = DerivedCtor;
8464 CXXRecordDecl *Derived;
8465 typedef llvm::DenseMap<const Type *, InheritingConstructorsForType> MapType;
8470 void Sema::DeclareInheritingConstructors(CXXRecordDecl *ClassDecl) {
8471 // Defer declaring the inheriting constructors until the class is
8473 if (ClassDecl->isDependentContext())
8476 // Find base classes from which we might inherit constructors.
8477 SmallVector<CXXRecordDecl*, 4> InheritedBases;
8478 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(),
8479 BaseE = ClassDecl->bases_end();
8480 BaseIt != BaseE; ++BaseIt)
8481 if (BaseIt->getInheritConstructors())
8482 InheritedBases.push_back(BaseIt->getType()->getAsCXXRecordDecl());
8484 // Go no further if we're not inheriting any constructors.
8485 if (InheritedBases.empty())
8488 // Declare the inherited constructors.
8489 InheritingConstructorInfo ICI(*this, ClassDecl);
8490 for (unsigned I = 0, N = InheritedBases.size(); I != N; ++I)
8491 ICI.inheritAll(InheritedBases[I]);
8494 void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation,
8495 CXXConstructorDecl *Constructor) {
8496 CXXRecordDecl *ClassDecl = Constructor->getParent();
8497 assert(Constructor->getInheritedConstructor() &&
8498 !Constructor->doesThisDeclarationHaveABody() &&
8499 !Constructor->isDeleted());
8501 SynthesizedFunctionScope Scope(*this, Constructor);
8502 DiagnosticErrorTrap Trap(Diags);
8503 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) ||
8504 Trap.hasErrorOccurred()) {
8505 Diag(CurrentLocation, diag::note_inhctor_synthesized_at)
8506 << Context.getTagDeclType(ClassDecl);
8507 Constructor->setInvalidDecl();
8511 SourceLocation Loc = Constructor->getLocation();
8512 Constructor->setBody(new (Context) CompoundStmt(Loc));
8514 Constructor->markUsed(Context);
8515 MarkVTableUsed(CurrentLocation, ClassDecl);
8517 if (ASTMutationListener *L = getASTMutationListener()) {
8518 L->CompletedImplicitDefinition(Constructor);
8523 Sema::ImplicitExceptionSpecification
8524 Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) {
8525 CXXRecordDecl *ClassDecl = MD->getParent();
8527 // C++ [except.spec]p14:
8528 // An implicitly declared special member function (Clause 12) shall have
8529 // an exception-specification.
8530 ImplicitExceptionSpecification ExceptSpec(*this);
8531 if (ClassDecl->isInvalidDecl())
8534 // Direct base-class destructors.
8535 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
8536 BEnd = ClassDecl->bases_end();
8538 if (B->isVirtual()) // Handled below.
8541 if (const RecordType *BaseType = B->getType()->getAs<RecordType>())
8542 ExceptSpec.CalledDecl(B->getLocStart(),
8543 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl())));
8546 // Virtual base-class destructors.
8547 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
8548 BEnd = ClassDecl->vbases_end();
8550 if (const RecordType *BaseType = B->getType()->getAs<RecordType>())
8551 ExceptSpec.CalledDecl(B->getLocStart(),
8552 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl())));
8555 // Field destructors.
8556 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
8557 FEnd = ClassDecl->field_end();
8559 if (const RecordType *RecordTy
8560 = Context.getBaseElementType(F->getType())->getAs<RecordType>())
8561 ExceptSpec.CalledDecl(F->getLocation(),
8562 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl())));
8568 CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) {
8569 // C++ [class.dtor]p2:
8570 // If a class has no user-declared destructor, a destructor is
8571 // declared implicitly. An implicitly-declared destructor is an
8572 // inline public member of its class.
8573 assert(ClassDecl->needsImplicitDestructor());
8575 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor);
8576 if (DSM.isAlreadyBeingDeclared())
8579 // Create the actual destructor declaration.
8580 CanQualType ClassType
8581 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
8582 SourceLocation ClassLoc = ClassDecl->getLocation();
8583 DeclarationName Name
8584 = Context.DeclarationNames.getCXXDestructorName(ClassType);
8585 DeclarationNameInfo NameInfo(Name, ClassLoc);
8586 CXXDestructorDecl *Destructor
8587 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo,
8588 QualType(), 0, /*isInline=*/true,
8589 /*isImplicitlyDeclared=*/true);
8590 Destructor->setAccess(AS_public);
8591 Destructor->setDefaulted();
8592 Destructor->setImplicit();
8594 // Build an exception specification pointing back at this destructor.
8595 FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, Destructor);
8596 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI));
8598 AddOverriddenMethods(ClassDecl, Destructor);
8600 // We don't need to use SpecialMemberIsTrivial here; triviality for
8601 // destructors is easy to compute.
8602 Destructor->setTrivial(ClassDecl->hasTrivialDestructor());
8604 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor))
8605 SetDeclDeleted(Destructor, ClassLoc);
8607 // Note that we have declared this destructor.
8608 ++ASTContext::NumImplicitDestructorsDeclared;
8610 // Introduce this destructor into its scope.
8611 if (Scope *S = getScopeForContext(ClassDecl))
8612 PushOnScopeChains(Destructor, S, false);
8613 ClassDecl->addDecl(Destructor);
8618 void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation,
8619 CXXDestructorDecl *Destructor) {
8620 assert((Destructor->isDefaulted() &&
8621 !Destructor->doesThisDeclarationHaveABody() &&
8622 !Destructor->isDeleted()) &&
8623 "DefineImplicitDestructor - call it for implicit default dtor");
8624 CXXRecordDecl *ClassDecl = Destructor->getParent();
8625 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor");
8627 if (Destructor->isInvalidDecl())
8630 SynthesizedFunctionScope Scope(*this, Destructor);
8632 DiagnosticErrorTrap Trap(Diags);
8633 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
8634 Destructor->getParent());
8636 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) {
8637 Diag(CurrentLocation, diag::note_member_synthesized_at)
8638 << CXXDestructor << Context.getTagDeclType(ClassDecl);
8640 Destructor->setInvalidDecl();
8644 SourceLocation Loc = Destructor->getLocation();
8645 Destructor->setBody(new (Context) CompoundStmt(Loc));
8646 Destructor->markUsed(Context);
8647 MarkVTableUsed(CurrentLocation, ClassDecl);
8649 if (ASTMutationListener *L = getASTMutationListener()) {
8650 L->CompletedImplicitDefinition(Destructor);
8654 /// \brief Perform any semantic analysis which needs to be delayed until all
8655 /// pending class member declarations have been parsed.
8656 void Sema::ActOnFinishCXXMemberDecls() {
8657 // If the context is an invalid C++ class, just suppress these checks.
8658 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) {
8659 if (Record->isInvalidDecl()) {
8660 DelayedDefaultedMemberExceptionSpecs.clear();
8661 DelayedDestructorExceptionSpecChecks.clear();
8667 void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl,
8668 CXXDestructorDecl *Destructor) {
8669 assert(getLangOpts().CPlusPlus11 &&
8670 "adjusting dtor exception specs was introduced in c++11");
8672 // C++11 [class.dtor]p3:
8673 // A declaration of a destructor that does not have an exception-
8674 // specification is implicitly considered to have the same exception-
8675 // specification as an implicit declaration.
8676 const FunctionProtoType *DtorType = Destructor->getType()->
8677 getAs<FunctionProtoType>();
8678 if (DtorType->hasExceptionSpec())
8681 // Replace the destructor's type, building off the existing one. Fortunately,
8682 // the only thing of interest in the destructor type is its extended info.
8683 // The return and arguments are fixed.
8684 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo();
8685 EPI.ExceptionSpecType = EST_Unevaluated;
8686 EPI.ExceptionSpecDecl = Destructor;
8687 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI));
8689 // FIXME: If the destructor has a body that could throw, and the newly created
8690 // spec doesn't allow exceptions, we should emit a warning, because this
8691 // change in behavior can break conforming C++03 programs at runtime.
8692 // However, we don't have a body or an exception specification yet, so it
8693 // needs to be done somewhere else.
8697 /// \brief An abstract base class for all helper classes used in building the
8698 // copy/move operators. These classes serve as factory functions and help us
8699 // avoid using the same Expr* in the AST twice.
8701 ExprBuilder(const ExprBuilder&) LLVM_DELETED_FUNCTION;
8702 ExprBuilder &operator=(const ExprBuilder&) LLVM_DELETED_FUNCTION;
8705 static Expr *assertNotNull(Expr *E) {
8706 assert(E && "Expression construction must not fail.");
8712 virtual ~ExprBuilder() {}
8714 virtual Expr *build(Sema &S, SourceLocation Loc) const = 0;
8717 class RefBuilder: public ExprBuilder {
8722 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE {
8723 return assertNotNull(S.BuildDeclRefExpr(Var, VarType, VK_LValue, Loc).take());
8726 RefBuilder(VarDecl *Var, QualType VarType)
8727 : Var(Var), VarType(VarType) {}
8730 class ThisBuilder: public ExprBuilder {
8732 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE {
8733 return assertNotNull(S.ActOnCXXThis(Loc).takeAs<Expr>());
8737 class CastBuilder: public ExprBuilder {
8738 const ExprBuilder &Builder;
8741 const CXXCastPath &Path;
8744 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE {
8745 return assertNotNull(S.ImpCastExprToType(Builder.build(S, Loc), Type,
8746 CK_UncheckedDerivedToBase, Kind,
8750 CastBuilder(const ExprBuilder &Builder, QualType Type, ExprValueKind Kind,
8751 const CXXCastPath &Path)
8752 : Builder(Builder), Type(Type), Kind(Kind), Path(Path) {}
8755 class DerefBuilder: public ExprBuilder {
8756 const ExprBuilder &Builder;
8759 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE {
8760 return assertNotNull(
8761 S.CreateBuiltinUnaryOp(Loc, UO_Deref, Builder.build(S, Loc)).take());
8764 DerefBuilder(const ExprBuilder &Builder) : Builder(Builder) {}
8767 class MemberBuilder: public ExprBuilder {
8768 const ExprBuilder &Builder;
8772 LookupResult &MemberLookup;
8775 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE {
8776 return assertNotNull(S.BuildMemberReferenceExpr(
8777 Builder.build(S, Loc), Type, Loc, IsArrow, SS, SourceLocation(), 0,
8778 MemberLookup, 0).take());
8781 MemberBuilder(const ExprBuilder &Builder, QualType Type, bool IsArrow,
8782 LookupResult &MemberLookup)
8783 : Builder(Builder), Type(Type), IsArrow(IsArrow),
8784 MemberLookup(MemberLookup) {}
8787 class MoveCastBuilder: public ExprBuilder {
8788 const ExprBuilder &Builder;
8791 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE {
8792 return assertNotNull(CastForMoving(S, Builder.build(S, Loc)));
8795 MoveCastBuilder(const ExprBuilder &Builder) : Builder(Builder) {}
8798 class LvalueConvBuilder: public ExprBuilder {
8799 const ExprBuilder &Builder;
8802 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE {
8803 return assertNotNull(
8804 S.DefaultLvalueConversion(Builder.build(S, Loc)).take());
8807 LvalueConvBuilder(const ExprBuilder &Builder) : Builder(Builder) {}
8810 class SubscriptBuilder: public ExprBuilder {
8811 const ExprBuilder &Base;
8812 const ExprBuilder &Index;
8815 virtual Expr *build(Sema &S, SourceLocation Loc) const
8817 return assertNotNull(S.CreateBuiltinArraySubscriptExpr(
8818 Base.build(S, Loc), Loc, Index.build(S, Loc), Loc).take());
8821 SubscriptBuilder(const ExprBuilder &Base, const ExprBuilder &Index)
8822 : Base(Base), Index(Index) {}
8825 } // end anonymous namespace
8827 /// When generating a defaulted copy or move assignment operator, if a field
8828 /// should be copied with __builtin_memcpy rather than via explicit assignments,
8829 /// do so. This optimization only applies for arrays of scalars, and for arrays
8830 /// of class type where the selected copy/move-assignment operator is trivial.
8832 buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T,
8833 const ExprBuilder &ToB, const ExprBuilder &FromB) {
8834 // Compute the size of the memory buffer to be copied.
8835 QualType SizeType = S.Context.getSizeType();
8836 llvm::APInt Size(S.Context.getTypeSize(SizeType),
8837 S.Context.getTypeSizeInChars(T).getQuantity());
8839 // Take the address of the field references for "from" and "to". We
8840 // directly construct UnaryOperators here because semantic analysis
8841 // does not permit us to take the address of an xvalue.
8842 Expr *From = FromB.build(S, Loc);
8843 From = new (S.Context) UnaryOperator(From, UO_AddrOf,
8844 S.Context.getPointerType(From->getType()),
8845 VK_RValue, OK_Ordinary, Loc);
8846 Expr *To = ToB.build(S, Loc);
8847 To = new (S.Context) UnaryOperator(To, UO_AddrOf,
8848 S.Context.getPointerType(To->getType()),
8849 VK_RValue, OK_Ordinary, Loc);
8851 const Type *E = T->getBaseElementTypeUnsafe();
8852 bool NeedsCollectableMemCpy =
8853 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember();
8855 // Create a reference to the __builtin_objc_memmove_collectable function
8856 StringRef MemCpyName = NeedsCollectableMemCpy ?
8857 "__builtin_objc_memmove_collectable" :
8859 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc,
8860 Sema::LookupOrdinaryName);
8861 S.LookupName(R, S.TUScope, true);
8863 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>();
8865 // Something went horribly wrong earlier, and we will have complained
8869 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy,
8871 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail");
8873 Expr *CallArgs[] = {
8874 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc)
8876 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(),
8877 Loc, CallArgs, Loc);
8879 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!");
8880 return S.Owned(Call.takeAs<Stmt>());
8883 /// \brief Builds a statement that copies/moves the given entity from \p From to
8886 /// This routine is used to copy/move the members of a class with an
8887 /// implicitly-declared copy/move assignment operator. When the entities being
8888 /// copied are arrays, this routine builds for loops to copy them.
8890 /// \param S The Sema object used for type-checking.
8892 /// \param Loc The location where the implicit copy/move is being generated.
8894 /// \param T The type of the expressions being copied/moved. Both expressions
8895 /// must have this type.
8897 /// \param To The expression we are copying/moving to.
8899 /// \param From The expression we are copying/moving from.
8901 /// \param CopyingBaseSubobject Whether we're copying/moving a base subobject.
8902 /// Otherwise, it's a non-static member subobject.
8904 /// \param Copying Whether we're copying or moving.
8906 /// \param Depth Internal parameter recording the depth of the recursion.
8908 /// \returns A statement or a loop that copies the expressions, or StmtResult(0)
8909 /// if a memcpy should be used instead.
8911 buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T,
8912 const ExprBuilder &To, const ExprBuilder &From,
8913 bool CopyingBaseSubobject, bool Copying,
8914 unsigned Depth = 0) {
8915 // C++11 [class.copy]p28:
8916 // Each subobject is assigned in the manner appropriate to its type:
8918 // - if the subobject is of class type, as if by a call to operator= with
8919 // the subobject as the object expression and the corresponding
8920 // subobject of x as a single function argument (as if by explicit
8921 // qualification; that is, ignoring any possible virtual overriding
8922 // functions in more derived classes);
8924 // C++03 [class.copy]p13:
8925 // - if the subobject is of class type, the copy assignment operator for
8926 // the class is used (as if by explicit qualification; that is,
8927 // ignoring any possible virtual overriding functions in more derived
8929 if (const RecordType *RecordTy = T->getAs<RecordType>()) {
8930 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
8932 // Look for operator=.
8933 DeclarationName Name
8934 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal);
8935 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName);
8936 S.LookupQualifiedName(OpLookup, ClassDecl, false);
8938 // Prior to C++11, filter out any result that isn't a copy/move-assignment
8940 if (!S.getLangOpts().CPlusPlus11) {
8941 LookupResult::Filter F = OpLookup.makeFilter();
8942 while (F.hasNext()) {
8943 NamedDecl *D = F.next();
8944 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
8945 if (Method->isCopyAssignmentOperator() ||
8946 (!Copying && Method->isMoveAssignmentOperator()))
8954 // Suppress the protected check (C++ [class.protected]) for each of the
8955 // assignment operators we found. This strange dance is required when
8956 // we're assigning via a base classes's copy-assignment operator. To
8957 // ensure that we're getting the right base class subobject (without
8958 // ambiguities), we need to cast "this" to that subobject type; to
8959 // ensure that we don't go through the virtual call mechanism, we need
8960 // to qualify the operator= name with the base class (see below). However,
8961 // this means that if the base class has a protected copy assignment
8962 // operator, the protected member access check will fail. So, we
8963 // rewrite "protected" access to "public" access in this case, since we
8964 // know by construction that we're calling from a derived class.
8965 if (CopyingBaseSubobject) {
8966 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end();
8968 if (L.getAccess() == AS_protected)
8969 L.setAccess(AS_public);
8973 // Create the nested-name-specifier that will be used to qualify the
8974 // reference to operator=; this is required to suppress the virtual
8977 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr());
8978 SS.MakeTrivial(S.Context,
8979 NestedNameSpecifier::Create(S.Context, 0, false,
8983 // Create the reference to operator=.
8984 ExprResult OpEqualRef
8985 = S.BuildMemberReferenceExpr(To.build(S, Loc), T, Loc, /*isArrow=*/false,
8986 SS, /*TemplateKWLoc=*/SourceLocation(),
8987 /*FirstQualifierInScope=*/0,
8990 /*SuppressQualifierCheck=*/true);
8991 if (OpEqualRef.isInvalid())
8994 // Build the call to the assignment operator.
8996 Expr *FromInst = From.build(S, Loc);
8997 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0,
8998 OpEqualRef.takeAs<Expr>(),
8999 Loc, FromInst, Loc);
9000 if (Call.isInvalid())
9003 // If we built a call to a trivial 'operator=' while copying an array,
9004 // bail out. We'll replace the whole shebang with a memcpy.
9005 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get());
9006 if (CE && CE->getMethodDecl()->isTrivial() && Depth)
9007 return StmtResult((Stmt*)0);
9009 // Convert to an expression-statement, and clean up any produced
9011 return S.ActOnExprStmt(Call);
9014 // - if the subobject is of scalar type, the built-in assignment
9015 // operator is used.
9016 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T);
9018 ExprResult Assignment = S.CreateBuiltinBinOp(
9019 Loc, BO_Assign, To.build(S, Loc), From.build(S, Loc));
9020 if (Assignment.isInvalid())
9022 return S.ActOnExprStmt(Assignment);
9025 // - if the subobject is an array, each element is assigned, in the
9026 // manner appropriate to the element type;
9028 // Construct a loop over the array bounds, e.g.,
9030 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0)
9032 // that will copy each of the array elements.
9033 QualType SizeType = S.Context.getSizeType();
9035 // Create the iteration variable.
9036 IdentifierInfo *IterationVarName = 0;
9039 llvm::raw_svector_ostream OS(Str);
9040 OS << "__i" << Depth;
9041 IterationVarName = &S.Context.Idents.get(OS.str());
9043 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc,
9044 IterationVarName, SizeType,
9045 S.Context.getTrivialTypeSourceInfo(SizeType, Loc),
9048 // Initialize the iteration variable to zero.
9049 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0);
9050 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc));
9052 // Creates a reference to the iteration variable.
9053 RefBuilder IterationVarRef(IterationVar, SizeType);
9054 LvalueConvBuilder IterationVarRefRVal(IterationVarRef);
9056 // Create the DeclStmt that holds the iteration variable.
9057 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc);
9059 // Subscript the "from" and "to" expressions with the iteration variable.
9060 SubscriptBuilder FromIndexCopy(From, IterationVarRefRVal);
9061 MoveCastBuilder FromIndexMove(FromIndexCopy);
9062 const ExprBuilder *FromIndex;
9064 FromIndex = &FromIndexCopy;
9066 FromIndex = &FromIndexMove;
9068 SubscriptBuilder ToIndex(To, IterationVarRefRVal);
9070 // Build the copy/move for an individual element of the array.
9072 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(),
9073 ToIndex, *FromIndex, CopyingBaseSubobject,
9074 Copying, Depth + 1);
9075 // Bail out if copying fails or if we determined that we should use memcpy.
9076 if (Copy.isInvalid() || !Copy.get())
9079 // Create the comparison against the array bound.
9081 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType));
9083 = new (S.Context) BinaryOperator(IterationVarRefRVal.build(S, Loc),
9084 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc),
9085 BO_NE, S.Context.BoolTy,
9086 VK_RValue, OK_Ordinary, Loc, false);
9088 // Create the pre-increment of the iteration variable.
9090 = new (S.Context) UnaryOperator(IterationVarRef.build(S, Loc), UO_PreInc,
9091 SizeType, VK_LValue, OK_Ordinary, Loc);
9093 // Construct the loop that copies all elements of this array.
9094 return S.ActOnForStmt(Loc, Loc, InitStmt,
9095 S.MakeFullExpr(Comparison),
9096 0, S.MakeFullDiscardedValueExpr(Increment),
9101 buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T,
9102 const ExprBuilder &To, const ExprBuilder &From,
9103 bool CopyingBaseSubobject, bool Copying) {
9104 // Maybe we should use a memcpy?
9105 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() &&
9106 T.isTriviallyCopyableType(S.Context))
9107 return buildMemcpyForAssignmentOp(S, Loc, T, To, From);
9109 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From,
9110 CopyingBaseSubobject,
9113 // If we ended up picking a trivial assignment operator for an array of a
9114 // non-trivially-copyable class type, just emit a memcpy.
9115 if (!Result.isInvalid() && !Result.get())
9116 return buildMemcpyForAssignmentOp(S, Loc, T, To, From);
9121 Sema::ImplicitExceptionSpecification
9122 Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) {
9123 CXXRecordDecl *ClassDecl = MD->getParent();
9125 ImplicitExceptionSpecification ExceptSpec(*this);
9126 if (ClassDecl->isInvalidDecl())
9129 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>();
9130 assert(T->getNumArgs() == 1 && "not a copy assignment op");
9131 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers();
9133 // C++ [except.spec]p14:
9134 // An implicitly declared special member function (Clause 12) shall have an
9135 // exception-specification. [...]
9137 // It is unspecified whether or not an implicit copy assignment operator
9138 // attempts to deduplicate calls to assignment operators of virtual bases are
9139 // made. As such, this exception specification is effectively unspecified.
9140 // Based on a similar decision made for constness in C++0x, we're erring on
9141 // the side of assuming such calls to be made regardless of whether they
9143 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
9144 BaseEnd = ClassDecl->bases_end();
9145 Base != BaseEnd; ++Base) {
9146 if (Base->isVirtual())
9149 CXXRecordDecl *BaseClassDecl
9150 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
9151 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl,
9152 ArgQuals, false, 0))
9153 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign);
9156 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
9157 BaseEnd = ClassDecl->vbases_end();
9158 Base != BaseEnd; ++Base) {
9159 CXXRecordDecl *BaseClassDecl
9160 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
9161 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl,
9162 ArgQuals, false, 0))
9163 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign);
9166 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
9167 FieldEnd = ClassDecl->field_end();
9170 QualType FieldType = Context.getBaseElementType(Field->getType());
9171 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
9172 if (CXXMethodDecl *CopyAssign =
9173 LookupCopyingAssignment(FieldClassDecl,
9174 ArgQuals | FieldType.getCVRQualifiers(),
9176 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign);
9183 CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) {
9184 // Note: The following rules are largely analoguous to the copy
9185 // constructor rules. Note that virtual bases are not taken into account
9186 // for determining the argument type of the operator. Note also that
9187 // operators taking an object instead of a reference are allowed.
9188 assert(ClassDecl->needsImplicitCopyAssignment());
9190 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment);
9191 if (DSM.isAlreadyBeingDeclared())
9194 QualType ArgType = Context.getTypeDeclType(ClassDecl);
9195 QualType RetType = Context.getLValueReferenceType(ArgType);
9196 bool Const = ClassDecl->implicitCopyAssignmentHasConstParam();
9198 ArgType = ArgType.withConst();
9199 ArgType = Context.getLValueReferenceType(ArgType);
9201 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
9205 // An implicitly-declared copy assignment operator is an inline public
9206 // member of its class.
9207 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
9208 SourceLocation ClassLoc = ClassDecl->getLocation();
9209 DeclarationNameInfo NameInfo(Name, ClassLoc);
9210 CXXMethodDecl *CopyAssignment =
9211 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(),
9212 /*TInfo=*/ 0, /*StorageClass=*/ SC_None,
9213 /*isInline=*/ true, Constexpr, SourceLocation());
9214 CopyAssignment->setAccess(AS_public);
9215 CopyAssignment->setDefaulted();
9216 CopyAssignment->setImplicit();
9218 // Build an exception specification pointing back at this member.
9219 FunctionProtoType::ExtProtoInfo EPI =
9220 getImplicitMethodEPI(*this, CopyAssignment);
9221 CopyAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI));
9223 // Add the parameter to the operator.
9224 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment,
9225 ClassLoc, ClassLoc, /*Id=*/0,
9226 ArgType, /*TInfo=*/0,
9228 CopyAssignment->setParams(FromParam);
9230 AddOverriddenMethods(ClassDecl, CopyAssignment);
9232 CopyAssignment->setTrivial(
9233 ClassDecl->needsOverloadResolutionForCopyAssignment()
9234 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment)
9235 : ClassDecl->hasTrivialCopyAssignment());
9237 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment))
9238 SetDeclDeleted(CopyAssignment, ClassLoc);
9240 // Note that we have added this copy-assignment operator.
9241 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared;
9243 if (Scope *S = getScopeForContext(ClassDecl))
9244 PushOnScopeChains(CopyAssignment, S, false);
9245 ClassDecl->addDecl(CopyAssignment);
9247 return CopyAssignment;
9250 /// Diagnose an implicit copy operation for a class which is odr-used, but
9251 /// which is deprecated because the class has a user-declared copy constructor,
9252 /// copy assignment operator, or destructor.
9253 static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp,
9254 SourceLocation UseLoc) {
9255 assert(CopyOp->isImplicit());
9257 CXXRecordDecl *RD = CopyOp->getParent();
9258 CXXMethodDecl *UserDeclaredOperation = 0;
9260 // In Microsoft mode, assignment operations don't affect constructors and
9262 if (RD->hasUserDeclaredDestructor()) {
9263 UserDeclaredOperation = RD->getDestructor();
9264 } else if (!isa<CXXConstructorDecl>(CopyOp) &&
9265 RD->hasUserDeclaredCopyConstructor() &&
9266 !S.getLangOpts().MicrosoftMode) {
9267 // Find any user-declared copy constructor.
9268 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(),
9269 E = RD->ctor_end(); I != E; ++I) {
9270 if (I->isCopyConstructor()) {
9271 UserDeclaredOperation = *I;
9275 assert(UserDeclaredOperation);
9276 } else if (isa<CXXConstructorDecl>(CopyOp) &&
9277 RD->hasUserDeclaredCopyAssignment() &&
9278 !S.getLangOpts().MicrosoftMode) {
9279 // Find any user-declared move assignment operator.
9280 for (CXXRecordDecl::method_iterator I = RD->method_begin(),
9281 E = RD->method_end(); I != E; ++I) {
9282 if (I->isCopyAssignmentOperator()) {
9283 UserDeclaredOperation = *I;
9287 assert(UserDeclaredOperation);
9290 if (UserDeclaredOperation) {
9291 S.Diag(UserDeclaredOperation->getLocation(),
9292 diag::warn_deprecated_copy_operation)
9293 << RD << /*copy assignment*/!isa<CXXConstructorDecl>(CopyOp)
9294 << /*destructor*/isa<CXXDestructorDecl>(UserDeclaredOperation);
9295 S.Diag(UseLoc, diag::note_member_synthesized_at)
9296 << (isa<CXXConstructorDecl>(CopyOp) ? Sema::CXXCopyConstructor
9297 : Sema::CXXCopyAssignment)
9302 void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation,
9303 CXXMethodDecl *CopyAssignOperator) {
9304 assert((CopyAssignOperator->isDefaulted() &&
9305 CopyAssignOperator->isOverloadedOperator() &&
9306 CopyAssignOperator->getOverloadedOperator() == OO_Equal &&
9307 !CopyAssignOperator->doesThisDeclarationHaveABody() &&
9308 !CopyAssignOperator->isDeleted()) &&
9309 "DefineImplicitCopyAssignment called for wrong function");
9311 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent();
9313 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) {
9314 CopyAssignOperator->setInvalidDecl();
9318 // C++11 [class.copy]p18:
9319 // The [definition of an implicitly declared copy assignment operator] is
9320 // deprecated if the class has a user-declared copy constructor or a
9321 // user-declared destructor.
9322 if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit())
9323 diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator, CurrentLocation);
9325 CopyAssignOperator->markUsed(Context);
9327 SynthesizedFunctionScope Scope(*this, CopyAssignOperator);
9328 DiagnosticErrorTrap Trap(Diags);
9330 // C++0x [class.copy]p30:
9331 // The implicitly-defined or explicitly-defaulted copy assignment operator
9332 // for a non-union class X performs memberwise copy assignment of its
9333 // subobjects. The direct base classes of X are assigned first, in the
9334 // order of their declaration in the base-specifier-list, and then the
9335 // immediate non-static data members of X are assigned, in the order in
9336 // which they were declared in the class definition.
9338 // The statements that form the synthesized function body.
9339 SmallVector<Stmt*, 8> Statements;
9341 // The parameter for the "other" object, which we are copying from.
9342 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0);
9343 Qualifiers OtherQuals = Other->getType().getQualifiers();
9344 QualType OtherRefType = Other->getType();
9345 if (const LValueReferenceType *OtherRef
9346 = OtherRefType->getAs<LValueReferenceType>()) {
9347 OtherRefType = OtherRef->getPointeeType();
9348 OtherQuals = OtherRefType.getQualifiers();
9351 // Our location for everything implicitly-generated.
9352 SourceLocation Loc = CopyAssignOperator->getLocation();
9354 // Builds a DeclRefExpr for the "other" object.
9355 RefBuilder OtherRef(Other, OtherRefType);
9357 // Builds the "this" pointer.
9360 // Assign base classes.
9361 bool Invalid = false;
9362 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
9363 E = ClassDecl->bases_end(); Base != E; ++Base) {
9364 // Form the assignment:
9365 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other));
9366 QualType BaseType = Base->getType().getUnqualifiedType();
9367 if (!BaseType->isRecordType()) {
9372 CXXCastPath BasePath;
9373 BasePath.push_back(Base);
9375 // Construct the "from" expression, which is an implicit cast to the
9376 // appropriately-qualified base type.
9377 CastBuilder From(OtherRef, Context.getQualifiedType(BaseType, OtherQuals),
9378 VK_LValue, BasePath);
9380 // Dereference "this".
9381 DerefBuilder DerefThis(This);
9382 CastBuilder To(DerefThis,
9383 Context.getCVRQualifiedType(
9384 BaseType, CopyAssignOperator->getTypeQualifiers()),
9385 VK_LValue, BasePath);
9388 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType,
9390 /*CopyingBaseSubobject=*/true,
9392 if (Copy.isInvalid()) {
9393 Diag(CurrentLocation, diag::note_member_synthesized_at)
9394 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
9395 CopyAssignOperator->setInvalidDecl();
9399 // Success! Record the copy.
9400 Statements.push_back(Copy.takeAs<Expr>());
9403 // Assign non-static members.
9404 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
9405 FieldEnd = ClassDecl->field_end();
9406 Field != FieldEnd; ++Field) {
9407 if (Field->isUnnamedBitfield())
9410 if (Field->isInvalidDecl()) {
9415 // Check for members of reference type; we can't copy those.
9416 if (Field->getType()->isReferenceType()) {
9417 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
9418 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
9419 Diag(Field->getLocation(), diag::note_declared_at);
9420 Diag(CurrentLocation, diag::note_member_synthesized_at)
9421 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
9426 // Check for members of const-qualified, non-class type.
9427 QualType BaseType = Context.getBaseElementType(Field->getType());
9428 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
9429 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
9430 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
9431 Diag(Field->getLocation(), diag::note_declared_at);
9432 Diag(CurrentLocation, diag::note_member_synthesized_at)
9433 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
9438 // Suppress assigning zero-width bitfields.
9439 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0)
9442 QualType FieldType = Field->getType().getNonReferenceType();
9443 if (FieldType->isIncompleteArrayType()) {
9444 assert(ClassDecl->hasFlexibleArrayMember() &&
9445 "Incomplete array type is not valid");
9449 // Build references to the field in the object we're copying from and to.
9450 CXXScopeSpec SS; // Intentionally empty
9451 LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
9453 MemberLookup.addDecl(*Field);
9454 MemberLookup.resolveKind();
9456 MemberBuilder From(OtherRef, OtherRefType, /*IsArrow=*/false, MemberLookup);
9458 MemberBuilder To(This, getCurrentThisType(), /*IsArrow=*/true, MemberLookup);
9460 // Build the copy of this field.
9461 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType,
9463 /*CopyingBaseSubobject=*/false,
9465 if (Copy.isInvalid()) {
9466 Diag(CurrentLocation, diag::note_member_synthesized_at)
9467 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
9468 CopyAssignOperator->setInvalidDecl();
9472 // Success! Record the copy.
9473 Statements.push_back(Copy.takeAs<Stmt>());
9477 // Add a "return *this;"
9478 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc));
9480 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get());
9481 if (Return.isInvalid())
9484 Statements.push_back(Return.takeAs<Stmt>());
9486 if (Trap.hasErrorOccurred()) {
9487 Diag(CurrentLocation, diag::note_member_synthesized_at)
9488 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
9495 CopyAssignOperator->setInvalidDecl();
9501 CompoundScopeRAII CompoundScope(*this);
9502 Body = ActOnCompoundStmt(Loc, Loc, Statements,
9503 /*isStmtExpr=*/false);
9504 assert(!Body.isInvalid() && "Compound statement creation cannot fail");
9506 CopyAssignOperator->setBody(Body.takeAs<Stmt>());
9508 if (ASTMutationListener *L = getASTMutationListener()) {
9509 L->CompletedImplicitDefinition(CopyAssignOperator);
9513 Sema::ImplicitExceptionSpecification
9514 Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) {
9515 CXXRecordDecl *ClassDecl = MD->getParent();
9517 ImplicitExceptionSpecification ExceptSpec(*this);
9518 if (ClassDecl->isInvalidDecl())
9521 // C++0x [except.spec]p14:
9522 // An implicitly declared special member function (Clause 12) shall have an
9523 // exception-specification. [...]
9525 // It is unspecified whether or not an implicit move assignment operator
9526 // attempts to deduplicate calls to assignment operators of virtual bases are
9527 // made. As such, this exception specification is effectively unspecified.
9528 // Based on a similar decision made for constness in C++0x, we're erring on
9529 // the side of assuming such calls to be made regardless of whether they
9531 // Note that a move constructor is not implicitly declared when there are
9532 // virtual bases, but it can still be user-declared and explicitly defaulted.
9533 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
9534 BaseEnd = ClassDecl->bases_end();
9535 Base != BaseEnd; ++Base) {
9536 if (Base->isVirtual())
9539 CXXRecordDecl *BaseClassDecl
9540 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
9541 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl,
9543 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign);
9546 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
9547 BaseEnd = ClassDecl->vbases_end();
9548 Base != BaseEnd; ++Base) {
9549 CXXRecordDecl *BaseClassDecl
9550 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
9551 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl,
9553 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign);
9556 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
9557 FieldEnd = ClassDecl->field_end();
9560 QualType FieldType = Context.getBaseElementType(Field->getType());
9561 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
9562 if (CXXMethodDecl *MoveAssign =
9563 LookupMovingAssignment(FieldClassDecl,
9564 FieldType.getCVRQualifiers(),
9566 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign);
9573 CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) {
9574 assert(ClassDecl->needsImplicitMoveAssignment());
9576 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment);
9577 if (DSM.isAlreadyBeingDeclared())
9580 // Note: The following rules are largely analoguous to the move
9581 // constructor rules.
9583 QualType ArgType = Context.getTypeDeclType(ClassDecl);
9584 QualType RetType = Context.getLValueReferenceType(ArgType);
9585 ArgType = Context.getRValueReferenceType(ArgType);
9587 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
9591 // An implicitly-declared move assignment operator is an inline public
9592 // member of its class.
9593 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
9594 SourceLocation ClassLoc = ClassDecl->getLocation();
9595 DeclarationNameInfo NameInfo(Name, ClassLoc);
9596 CXXMethodDecl *MoveAssignment =
9597 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(),
9598 /*TInfo=*/0, /*StorageClass=*/SC_None,
9599 /*isInline=*/true, Constexpr, SourceLocation());
9600 MoveAssignment->setAccess(AS_public);
9601 MoveAssignment->setDefaulted();
9602 MoveAssignment->setImplicit();
9604 // Build an exception specification pointing back at this member.
9605 FunctionProtoType::ExtProtoInfo EPI =
9606 getImplicitMethodEPI(*this, MoveAssignment);
9607 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI));
9609 // Add the parameter to the operator.
9610 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment,
9611 ClassLoc, ClassLoc, /*Id=*/0,
9612 ArgType, /*TInfo=*/0,
9614 MoveAssignment->setParams(FromParam);
9616 AddOverriddenMethods(ClassDecl, MoveAssignment);
9618 MoveAssignment->setTrivial(
9619 ClassDecl->needsOverloadResolutionForMoveAssignment()
9620 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment)
9621 : ClassDecl->hasTrivialMoveAssignment());
9623 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) {
9624 ClassDecl->setImplicitMoveAssignmentIsDeleted();
9625 SetDeclDeleted(MoveAssignment, ClassLoc);
9628 // Note that we have added this copy-assignment operator.
9629 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared;
9631 if (Scope *S = getScopeForContext(ClassDecl))
9632 PushOnScopeChains(MoveAssignment, S, false);
9633 ClassDecl->addDecl(MoveAssignment);
9635 return MoveAssignment;
9638 /// Check if we're implicitly defining a move assignment operator for a class
9639 /// with virtual bases. Such a move assignment might move-assign the virtual
9640 /// base multiple times.
9641 static void checkMoveAssignmentForRepeatedMove(Sema &S, CXXRecordDecl *Class,
9642 SourceLocation CurrentLocation) {
9643 assert(!Class->isDependentContext() && "should not define dependent move");
9645 // Only a virtual base could get implicitly move-assigned multiple times.
9646 // Only a non-trivial move assignment can observe this. We only want to
9647 // diagnose if we implicitly define an assignment operator that assigns
9648 // two base classes, both of which move-assign the same virtual base.
9649 if (Class->getNumVBases() == 0 || Class->hasTrivialMoveAssignment() ||
9650 Class->getNumBases() < 2)
9653 llvm::SmallVector<CXXBaseSpecifier *, 16> Worklist;
9654 typedef llvm::DenseMap<CXXRecordDecl*, CXXBaseSpecifier*> VBaseMap;
9657 for (CXXRecordDecl::base_class_iterator BI = Class->bases_begin(),
9658 BE = Class->bases_end();
9660 Worklist.push_back(&*BI);
9661 while (!Worklist.empty()) {
9662 CXXBaseSpecifier *BaseSpec = Worklist.pop_back_val();
9663 CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl();
9665 // If the base has no non-trivial move assignment operators,
9666 // we don't care about moves from it.
9667 if (!Base->hasNonTrivialMoveAssignment())
9670 // If there's nothing virtual here, skip it.
9671 if (!BaseSpec->isVirtual() && !Base->getNumVBases())
9674 // If we're not actually going to call a move assignment for this base,
9675 // or the selected move assignment is trivial, skip it.
9676 Sema::SpecialMemberOverloadResult *SMOR =
9677 S.LookupSpecialMember(Base, Sema::CXXMoveAssignment,
9678 /*ConstArg*/false, /*VolatileArg*/false,
9679 /*RValueThis*/true, /*ConstThis*/false,
9680 /*VolatileThis*/false);
9681 if (!SMOR->getMethod() || SMOR->getMethod()->isTrivial() ||
9682 !SMOR->getMethod()->isMoveAssignmentOperator())
9685 if (BaseSpec->isVirtual()) {
9686 // We're going to move-assign this virtual base, and its move
9687 // assignment operator is not trivial. If this can happen for
9688 // multiple distinct direct bases of Class, diagnose it. (If it
9689 // only happens in one base, we'll diagnose it when synthesizing
9690 // that base class's move assignment operator.)
9691 CXXBaseSpecifier *&Existing =
9692 VBases.insert(std::make_pair(Base->getCanonicalDecl(), BI))
9694 if (Existing && Existing != BI) {
9695 S.Diag(CurrentLocation, diag::warn_vbase_moved_multiple_times)
9697 S.Diag(Existing->getLocStart(), diag::note_vbase_moved_here)
9698 << (Base->getCanonicalDecl() ==
9699 Existing->getType()->getAsCXXRecordDecl()->getCanonicalDecl())
9700 << Base << Existing->getType() << Existing->getSourceRange();
9701 S.Diag(BI->getLocStart(), diag::note_vbase_moved_here)
9702 << (Base->getCanonicalDecl() ==
9703 BI->getType()->getAsCXXRecordDecl()->getCanonicalDecl())
9704 << Base << BI->getType() << BaseSpec->getSourceRange();
9706 // Only diagnose each vbase once.
9710 // Only walk over bases that have defaulted move assignment operators.
9711 // We assume that any user-provided move assignment operator handles
9712 // the multiple-moves-of-vbase case itself somehow.
9713 if (!SMOR->getMethod()->isDefaulted())
9716 // We're going to move the base classes of Base. Add them to the list.
9717 for (CXXRecordDecl::base_class_iterator BI = Base->bases_begin(),
9718 BE = Base->bases_end();
9720 Worklist.push_back(&*BI);
9726 void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation,
9727 CXXMethodDecl *MoveAssignOperator) {
9728 assert((MoveAssignOperator->isDefaulted() &&
9729 MoveAssignOperator->isOverloadedOperator() &&
9730 MoveAssignOperator->getOverloadedOperator() == OO_Equal &&
9731 !MoveAssignOperator->doesThisDeclarationHaveABody() &&
9732 !MoveAssignOperator->isDeleted()) &&
9733 "DefineImplicitMoveAssignment called for wrong function");
9735 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent();
9737 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) {
9738 MoveAssignOperator->setInvalidDecl();
9742 MoveAssignOperator->markUsed(Context);
9744 SynthesizedFunctionScope Scope(*this, MoveAssignOperator);
9745 DiagnosticErrorTrap Trap(Diags);
9747 // C++0x [class.copy]p28:
9748 // The implicitly-defined or move assignment operator for a non-union class
9749 // X performs memberwise move assignment of its subobjects. The direct base
9750 // classes of X are assigned first, in the order of their declaration in the
9751 // base-specifier-list, and then the immediate non-static data members of X
9752 // are assigned, in the order in which they were declared in the class
9755 // Issue a warning if our implicit move assignment operator will move
9756 // from a virtual base more than once.
9757 checkMoveAssignmentForRepeatedMove(*this, ClassDecl, CurrentLocation);
9759 // The statements that form the synthesized function body.
9760 SmallVector<Stmt*, 8> Statements;
9762 // The parameter for the "other" object, which we are move from.
9763 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0);
9764 QualType OtherRefType = Other->getType()->
9765 getAs<RValueReferenceType>()->getPointeeType();
9766 assert(!OtherRefType.getQualifiers() &&
9767 "Bad argument type of defaulted move assignment");
9769 // Our location for everything implicitly-generated.
9770 SourceLocation Loc = MoveAssignOperator->getLocation();
9772 // Builds a reference to the "other" object.
9773 RefBuilder OtherRef(Other, OtherRefType);
9775 MoveCastBuilder MoveOther(OtherRef);
9777 // Builds the "this" pointer.
9780 // Assign base classes.
9781 bool Invalid = false;
9782 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
9783 E = ClassDecl->bases_end(); Base != E; ++Base) {
9784 // C++11 [class.copy]p28:
9785 // It is unspecified whether subobjects representing virtual base classes
9786 // are assigned more than once by the implicitly-defined copy assignment
9788 // FIXME: Do not assign to a vbase that will be assigned by some other base
9789 // class. For a move-assignment, this can result in the vbase being moved
9792 // Form the assignment:
9793 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other));
9794 QualType BaseType = Base->getType().getUnqualifiedType();
9795 if (!BaseType->isRecordType()) {
9800 CXXCastPath BasePath;
9801 BasePath.push_back(Base);
9803 // Construct the "from" expression, which is an implicit cast to the
9804 // appropriately-qualified base type.
9805 CastBuilder From(OtherRef, BaseType, VK_XValue, BasePath);
9807 // Dereference "this".
9808 DerefBuilder DerefThis(This);
9810 // Implicitly cast "this" to the appropriately-qualified base type.
9811 CastBuilder To(DerefThis,
9812 Context.getCVRQualifiedType(
9813 BaseType, MoveAssignOperator->getTypeQualifiers()),
9814 VK_LValue, BasePath);
9817 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType,
9819 /*CopyingBaseSubobject=*/true,
9821 if (Move.isInvalid()) {
9822 Diag(CurrentLocation, diag::note_member_synthesized_at)
9823 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
9824 MoveAssignOperator->setInvalidDecl();
9828 // Success! Record the move.
9829 Statements.push_back(Move.takeAs<Expr>());
9832 // Assign non-static members.
9833 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
9834 FieldEnd = ClassDecl->field_end();
9835 Field != FieldEnd; ++Field) {
9836 if (Field->isUnnamedBitfield())
9839 if (Field->isInvalidDecl()) {
9844 // Check for members of reference type; we can't move those.
9845 if (Field->getType()->isReferenceType()) {
9846 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
9847 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
9848 Diag(Field->getLocation(), diag::note_declared_at);
9849 Diag(CurrentLocation, diag::note_member_synthesized_at)
9850 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
9855 // Check for members of const-qualified, non-class type.
9856 QualType BaseType = Context.getBaseElementType(Field->getType());
9857 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
9858 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
9859 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
9860 Diag(Field->getLocation(), diag::note_declared_at);
9861 Diag(CurrentLocation, diag::note_member_synthesized_at)
9862 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
9867 // Suppress assigning zero-width bitfields.
9868 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0)
9871 QualType FieldType = Field->getType().getNonReferenceType();
9872 if (FieldType->isIncompleteArrayType()) {
9873 assert(ClassDecl->hasFlexibleArrayMember() &&
9874 "Incomplete array type is not valid");
9878 // Build references to the field in the object we're copying from and to.
9879 LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
9881 MemberLookup.addDecl(*Field);
9882 MemberLookup.resolveKind();
9883 MemberBuilder From(MoveOther, OtherRefType,
9884 /*IsArrow=*/false, MemberLookup);
9885 MemberBuilder To(This, getCurrentThisType(),
9886 /*IsArrow=*/true, MemberLookup);
9888 assert(!From.build(*this, Loc)->isLValue() && // could be xvalue or prvalue
9889 "Member reference with rvalue base must be rvalue except for reference "
9890 "members, which aren't allowed for move assignment.");
9892 // Build the move of this field.
9893 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType,
9895 /*CopyingBaseSubobject=*/false,
9897 if (Move.isInvalid()) {
9898 Diag(CurrentLocation, diag::note_member_synthesized_at)
9899 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
9900 MoveAssignOperator->setInvalidDecl();
9904 // Success! Record the copy.
9905 Statements.push_back(Move.takeAs<Stmt>());
9909 // Add a "return *this;"
9910 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc));
9912 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get());
9913 if (Return.isInvalid())
9916 Statements.push_back(Return.takeAs<Stmt>());
9918 if (Trap.hasErrorOccurred()) {
9919 Diag(CurrentLocation, diag::note_member_synthesized_at)
9920 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
9927 MoveAssignOperator->setInvalidDecl();
9933 CompoundScopeRAII CompoundScope(*this);
9934 Body = ActOnCompoundStmt(Loc, Loc, Statements,
9935 /*isStmtExpr=*/false);
9936 assert(!Body.isInvalid() && "Compound statement creation cannot fail");
9938 MoveAssignOperator->setBody(Body.takeAs<Stmt>());
9940 if (ASTMutationListener *L = getASTMutationListener()) {
9941 L->CompletedImplicitDefinition(MoveAssignOperator);
9945 Sema::ImplicitExceptionSpecification
9946 Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) {
9947 CXXRecordDecl *ClassDecl = MD->getParent();
9949 ImplicitExceptionSpecification ExceptSpec(*this);
9950 if (ClassDecl->isInvalidDecl())
9953 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>();
9954 assert(T->getNumArgs() >= 1 && "not a copy ctor");
9955 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers();
9957 // C++ [except.spec]p14:
9958 // An implicitly declared special member function (Clause 12) shall have an
9959 // exception-specification. [...]
9960 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
9961 BaseEnd = ClassDecl->bases_end();
9964 // Virtual bases are handled below.
9965 if (Base->isVirtual())
9968 CXXRecordDecl *BaseClassDecl
9969 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
9970 if (CXXConstructorDecl *CopyConstructor =
9971 LookupCopyingConstructor(BaseClassDecl, Quals))
9972 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor);
9974 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
9975 BaseEnd = ClassDecl->vbases_end();
9978 CXXRecordDecl *BaseClassDecl
9979 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
9980 if (CXXConstructorDecl *CopyConstructor =
9981 LookupCopyingConstructor(BaseClassDecl, Quals))
9982 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor);
9984 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
9985 FieldEnd = ClassDecl->field_end();
9988 QualType FieldType = Context.getBaseElementType(Field->getType());
9989 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
9990 if (CXXConstructorDecl *CopyConstructor =
9991 LookupCopyingConstructor(FieldClassDecl,
9992 Quals | FieldType.getCVRQualifiers()))
9993 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor);
10000 CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor(
10001 CXXRecordDecl *ClassDecl) {
10002 // C++ [class.copy]p4:
10003 // If the class definition does not explicitly declare a copy
10004 // constructor, one is declared implicitly.
10005 assert(ClassDecl->needsImplicitCopyConstructor());
10007 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor);
10008 if (DSM.isAlreadyBeingDeclared())
10011 QualType ClassType = Context.getTypeDeclType(ClassDecl);
10012 QualType ArgType = ClassType;
10013 bool Const = ClassDecl->implicitCopyConstructorHasConstParam();
10015 ArgType = ArgType.withConst();
10016 ArgType = Context.getLValueReferenceType(ArgType);
10018 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
10019 CXXCopyConstructor,
10022 DeclarationName Name
10023 = Context.DeclarationNames.getCXXConstructorName(
10024 Context.getCanonicalType(ClassType));
10025 SourceLocation ClassLoc = ClassDecl->getLocation();
10026 DeclarationNameInfo NameInfo(Name, ClassLoc);
10028 // An implicitly-declared copy constructor is an inline public
10029 // member of its class.
10030 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create(
10031 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0,
10032 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true,
10034 CopyConstructor->setAccess(AS_public);
10035 CopyConstructor->setDefaulted();
10037 // Build an exception specification pointing back at this member.
10038 FunctionProtoType::ExtProtoInfo EPI =
10039 getImplicitMethodEPI(*this, CopyConstructor);
10040 CopyConstructor->setType(
10041 Context.getFunctionType(Context.VoidTy, ArgType, EPI));
10043 // Add the parameter to the constructor.
10044 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor,
10045 ClassLoc, ClassLoc,
10046 /*IdentifierInfo=*/0,
10047 ArgType, /*TInfo=*/0,
10049 CopyConstructor->setParams(FromParam);
10051 CopyConstructor->setTrivial(
10052 ClassDecl->needsOverloadResolutionForCopyConstructor()
10053 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor)
10054 : ClassDecl->hasTrivialCopyConstructor());
10056 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor))
10057 SetDeclDeleted(CopyConstructor, ClassLoc);
10059 // Note that we have declared this constructor.
10060 ++ASTContext::NumImplicitCopyConstructorsDeclared;
10062 if (Scope *S = getScopeForContext(ClassDecl))
10063 PushOnScopeChains(CopyConstructor, S, false);
10064 ClassDecl->addDecl(CopyConstructor);
10066 return CopyConstructor;
10069 void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
10070 CXXConstructorDecl *CopyConstructor) {
10071 assert((CopyConstructor->isDefaulted() &&
10072 CopyConstructor->isCopyConstructor() &&
10073 !CopyConstructor->doesThisDeclarationHaveABody() &&
10074 !CopyConstructor->isDeleted()) &&
10075 "DefineImplicitCopyConstructor - call it for implicit copy ctor");
10077 CXXRecordDecl *ClassDecl = CopyConstructor->getParent();
10078 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor");
10080 // C++11 [class.copy]p7:
10081 // The [definition of an implicitly declared copy constructor] is
10082 // deprecated if the class has a user-declared copy assignment operator
10083 // or a user-declared destructor.
10084 if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit())
10085 diagnoseDeprecatedCopyOperation(*this, CopyConstructor, CurrentLocation);
10087 SynthesizedFunctionScope Scope(*this, CopyConstructor);
10088 DiagnosticErrorTrap Trap(Diags);
10090 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false) ||
10091 Trap.hasErrorOccurred()) {
10092 Diag(CurrentLocation, diag::note_member_synthesized_at)
10093 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl);
10094 CopyConstructor->setInvalidDecl();
10096 Sema::CompoundScopeRAII CompoundScope(*this);
10097 CopyConstructor->setBody(ActOnCompoundStmt(
10098 CopyConstructor->getLocation(), CopyConstructor->getLocation(), None,
10099 /*isStmtExpr=*/ false).takeAs<Stmt>());
10102 CopyConstructor->markUsed(Context);
10103 if (ASTMutationListener *L = getASTMutationListener()) {
10104 L->CompletedImplicitDefinition(CopyConstructor);
10108 Sema::ImplicitExceptionSpecification
10109 Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) {
10110 CXXRecordDecl *ClassDecl = MD->getParent();
10112 // C++ [except.spec]p14:
10113 // An implicitly declared special member function (Clause 12) shall have an
10114 // exception-specification. [...]
10115 ImplicitExceptionSpecification ExceptSpec(*this);
10116 if (ClassDecl->isInvalidDecl())
10119 // Direct base-class constructors.
10120 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
10121 BEnd = ClassDecl->bases_end();
10123 if (B->isVirtual()) // Handled below.
10126 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
10127 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
10128 CXXConstructorDecl *Constructor =
10129 LookupMovingConstructor(BaseClassDecl, 0);
10130 // If this is a deleted function, add it anyway. This might be conformant
10131 // with the standard. This might not. I'm not sure. It might not matter.
10133 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
10137 // Virtual base-class constructors.
10138 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
10139 BEnd = ClassDecl->vbases_end();
10141 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
10142 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
10143 CXXConstructorDecl *Constructor =
10144 LookupMovingConstructor(BaseClassDecl, 0);
10145 // If this is a deleted function, add it anyway. This might be conformant
10146 // with the standard. This might not. I'm not sure. It might not matter.
10148 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
10152 // Field constructors.
10153 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
10154 FEnd = ClassDecl->field_end();
10156 QualType FieldType = Context.getBaseElementType(F->getType());
10157 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) {
10158 CXXConstructorDecl *Constructor =
10159 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers());
10160 // If this is a deleted function, add it anyway. This might be conformant
10161 // with the standard. This might not. I'm not sure. It might not matter.
10162 // In particular, the problem is that this function never gets called. It
10163 // might just be ill-formed because this function attempts to refer to
10164 // a deleted function here.
10166 ExceptSpec.CalledDecl(F->getLocation(), Constructor);
10173 CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor(
10174 CXXRecordDecl *ClassDecl) {
10175 assert(ClassDecl->needsImplicitMoveConstructor());
10177 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor);
10178 if (DSM.isAlreadyBeingDeclared())
10181 QualType ClassType = Context.getTypeDeclType(ClassDecl);
10182 QualType ArgType = Context.getRValueReferenceType(ClassType);
10184 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
10185 CXXMoveConstructor,
10188 DeclarationName Name
10189 = Context.DeclarationNames.getCXXConstructorName(
10190 Context.getCanonicalType(ClassType));
10191 SourceLocation ClassLoc = ClassDecl->getLocation();
10192 DeclarationNameInfo NameInfo(Name, ClassLoc);
10194 // C++11 [class.copy]p11:
10195 // An implicitly-declared copy/move constructor is an inline public
10196 // member of its class.
10197 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create(
10198 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0,
10199 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true,
10201 MoveConstructor->setAccess(AS_public);
10202 MoveConstructor->setDefaulted();
10204 // Build an exception specification pointing back at this member.
10205 FunctionProtoType::ExtProtoInfo EPI =
10206 getImplicitMethodEPI(*this, MoveConstructor);
10207 MoveConstructor->setType(
10208 Context.getFunctionType(Context.VoidTy, ArgType, EPI));
10210 // Add the parameter to the constructor.
10211 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor,
10212 ClassLoc, ClassLoc,
10213 /*IdentifierInfo=*/0,
10214 ArgType, /*TInfo=*/0,
10216 MoveConstructor->setParams(FromParam);
10218 MoveConstructor->setTrivial(
10219 ClassDecl->needsOverloadResolutionForMoveConstructor()
10220 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor)
10221 : ClassDecl->hasTrivialMoveConstructor());
10223 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) {
10224 ClassDecl->setImplicitMoveConstructorIsDeleted();
10225 SetDeclDeleted(MoveConstructor, ClassLoc);
10228 // Note that we have declared this constructor.
10229 ++ASTContext::NumImplicitMoveConstructorsDeclared;
10231 if (Scope *S = getScopeForContext(ClassDecl))
10232 PushOnScopeChains(MoveConstructor, S, false);
10233 ClassDecl->addDecl(MoveConstructor);
10235 return MoveConstructor;
10238 void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation,
10239 CXXConstructorDecl *MoveConstructor) {
10240 assert((MoveConstructor->isDefaulted() &&
10241 MoveConstructor->isMoveConstructor() &&
10242 !MoveConstructor->doesThisDeclarationHaveABody() &&
10243 !MoveConstructor->isDeleted()) &&
10244 "DefineImplicitMoveConstructor - call it for implicit move ctor");
10246 CXXRecordDecl *ClassDecl = MoveConstructor->getParent();
10247 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor");
10249 SynthesizedFunctionScope Scope(*this, MoveConstructor);
10250 DiagnosticErrorTrap Trap(Diags);
10252 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false) ||
10253 Trap.hasErrorOccurred()) {
10254 Diag(CurrentLocation, diag::note_member_synthesized_at)
10255 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl);
10256 MoveConstructor->setInvalidDecl();
10258 Sema::CompoundScopeRAII CompoundScope(*this);
10259 MoveConstructor->setBody(ActOnCompoundStmt(
10260 MoveConstructor->getLocation(), MoveConstructor->getLocation(), None,
10261 /*isStmtExpr=*/ false).takeAs<Stmt>());
10264 MoveConstructor->markUsed(Context);
10266 if (ASTMutationListener *L = getASTMutationListener()) {
10267 L->CompletedImplicitDefinition(MoveConstructor);
10271 bool Sema::isImplicitlyDeleted(FunctionDecl *FD) {
10272 return FD->isDeleted() && FD->isDefaulted() && isa<CXXMethodDecl>(FD);
10275 void Sema::DefineImplicitLambdaToFunctionPointerConversion(
10276 SourceLocation CurrentLocation,
10277 CXXConversionDecl *Conv) {
10278 CXXRecordDecl *Lambda = Conv->getParent();
10279 CXXMethodDecl *CallOp = Lambda->getLambdaCallOperator();
10280 // If we are defining a specialization of a conversion to function-ptr
10281 // cache the deduced template arguments for this specialization
10282 // so that we can use them to retrieve the corresponding call-operator
10283 // and static-invoker.
10284 const TemplateArgumentList *DeducedTemplateArgs = 0;
10287 // Retrieve the corresponding call-operator specialization.
10288 if (Lambda->isGenericLambda()) {
10289 assert(Conv->isFunctionTemplateSpecialization());
10290 FunctionTemplateDecl *CallOpTemplate =
10291 CallOp->getDescribedFunctionTemplate();
10292 DeducedTemplateArgs = Conv->getTemplateSpecializationArgs();
10293 void *InsertPos = 0;
10294 FunctionDecl *CallOpSpec = CallOpTemplate->findSpecialization(
10295 DeducedTemplateArgs->data(),
10296 DeducedTemplateArgs->size(),
10298 assert(CallOpSpec &&
10299 "Conversion operator must have a corresponding call operator");
10300 CallOp = cast<CXXMethodDecl>(CallOpSpec);
10302 // Mark the call operator referenced (and add to pending instantiations
10304 // For both the conversion and static-invoker template specializations
10305 // we construct their body's in this function, so no need to add them
10306 // to the PendingInstantiations.
10307 MarkFunctionReferenced(CurrentLocation, CallOp);
10309 SynthesizedFunctionScope Scope(*this, Conv);
10310 DiagnosticErrorTrap Trap(Diags);
10312 // Retreive the static invoker...
10313 CXXMethodDecl *Invoker = Lambda->getLambdaStaticInvoker();
10314 // ... and get the corresponding specialization for a generic lambda.
10315 if (Lambda->isGenericLambda()) {
10316 assert(DeducedTemplateArgs &&
10317 "Must have deduced template arguments from Conversion Operator");
10318 FunctionTemplateDecl *InvokeTemplate =
10319 Invoker->getDescribedFunctionTemplate();
10320 void *InsertPos = 0;
10321 FunctionDecl *InvokeSpec = InvokeTemplate->findSpecialization(
10322 DeducedTemplateArgs->data(),
10323 DeducedTemplateArgs->size(),
10325 assert(InvokeSpec &&
10326 "Must have a corresponding static invoker specialization");
10327 Invoker = cast<CXXMethodDecl>(InvokeSpec);
10329 // Construct the body of the conversion function { return __invoke; }.
10330 Expr *FunctionRef = BuildDeclRefExpr(Invoker, Invoker->getType(),
10331 VK_LValue, Conv->getLocation()).take();
10332 assert(FunctionRef && "Can't refer to __invoke function?");
10333 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take();
10334 Conv->setBody(new (Context) CompoundStmt(Context, Return,
10335 Conv->getLocation(),
10336 Conv->getLocation()));
10338 Conv->markUsed(Context);
10339 Conv->setReferenced();
10341 // Fill in the __invoke function with a dummy implementation. IR generation
10342 // will fill in the actual details.
10343 Invoker->markUsed(Context);
10344 Invoker->setReferenced();
10345 Invoker->setBody(new (Context) CompoundStmt(Conv->getLocation()));
10347 if (ASTMutationListener *L = getASTMutationListener()) {
10348 L->CompletedImplicitDefinition(Conv);
10349 L->CompletedImplicitDefinition(Invoker);
10355 void Sema::DefineImplicitLambdaToBlockPointerConversion(
10356 SourceLocation CurrentLocation,
10357 CXXConversionDecl *Conv)
10359 assert(!Conv->getParent()->isGenericLambda());
10361 Conv->markUsed(Context);
10363 SynthesizedFunctionScope Scope(*this, Conv);
10364 DiagnosticErrorTrap Trap(Diags);
10366 // Copy-initialize the lambda object as needed to capture it.
10367 Expr *This = ActOnCXXThis(CurrentLocation).take();
10368 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take();
10370 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation,
10371 Conv->getLocation(),
10374 // If we're not under ARC, make sure we still get the _Block_copy/autorelease
10375 // behavior. Note that only the general conversion function does this
10376 // (since it's unusable otherwise); in the case where we inline the
10377 // block literal, it has block literal lifetime semantics.
10378 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount)
10379 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(),
10380 CK_CopyAndAutoreleaseBlockObject,
10381 BuildBlock.get(), 0, VK_RValue);
10383 if (BuildBlock.isInvalid()) {
10384 Diag(CurrentLocation, diag::note_lambda_to_block_conv);
10385 Conv->setInvalidDecl();
10389 // Create the return statement that returns the block from the conversion
10391 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get());
10392 if (Return.isInvalid()) {
10393 Diag(CurrentLocation, diag::note_lambda_to_block_conv);
10394 Conv->setInvalidDecl();
10398 // Set the body of the conversion function.
10399 Stmt *ReturnS = Return.take();
10400 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS,
10401 Conv->getLocation(),
10402 Conv->getLocation()));
10404 // We're done; notify the mutation listener, if any.
10405 if (ASTMutationListener *L = getASTMutationListener()) {
10406 L->CompletedImplicitDefinition(Conv);
10410 /// \brief Determine whether the given list arguments contains exactly one
10411 /// "real" (non-default) argument.
10412 static bool hasOneRealArgument(MultiExprArg Args) {
10413 switch (Args.size()) {
10418 if (!Args[1]->isDefaultArgument())
10423 return !Args[0]->isDefaultArgument();
10430 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
10431 CXXConstructorDecl *Constructor,
10432 MultiExprArg ExprArgs,
10433 bool HadMultipleCandidates,
10434 bool IsListInitialization,
10435 bool RequiresZeroInit,
10436 unsigned ConstructKind,
10437 SourceRange ParenRange) {
10438 bool Elidable = false;
10440 // C++0x [class.copy]p34:
10441 // When certain criteria are met, an implementation is allowed to
10442 // omit the copy/move construction of a class object, even if the
10443 // copy/move constructor and/or destructor for the object have
10444 // side effects. [...]
10445 // - when a temporary class object that has not been bound to a
10446 // reference (12.2) would be copied/moved to a class object
10447 // with the same cv-unqualified type, the copy/move operation
10448 // can be omitted by constructing the temporary object
10449 // directly into the target of the omitted copy/move
10450 if (ConstructKind == CXXConstructExpr::CK_Complete &&
10451 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) {
10452 Expr *SubExpr = ExprArgs[0];
10453 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent());
10456 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor,
10457 Elidable, ExprArgs, HadMultipleCandidates,
10458 IsListInitialization, RequiresZeroInit,
10459 ConstructKind, ParenRange);
10462 /// BuildCXXConstructExpr - Creates a complete call to a constructor,
10463 /// including handling of its default argument expressions.
10465 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
10466 CXXConstructorDecl *Constructor, bool Elidable,
10467 MultiExprArg ExprArgs,
10468 bool HadMultipleCandidates,
10469 bool IsListInitialization,
10470 bool RequiresZeroInit,
10471 unsigned ConstructKind,
10472 SourceRange ParenRange) {
10473 MarkFunctionReferenced(ConstructLoc, Constructor);
10474 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc,
10475 Constructor, Elidable, ExprArgs,
10476 HadMultipleCandidates,
10477 IsListInitialization, RequiresZeroInit,
10478 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind),
10482 void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) {
10483 if (VD->isInvalidDecl()) return;
10485 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl());
10486 if (ClassDecl->isInvalidDecl()) return;
10487 if (ClassDecl->hasIrrelevantDestructor()) return;
10488 if (ClassDecl->isDependentContext()) return;
10490 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl);
10491 MarkFunctionReferenced(VD->getLocation(), Destructor);
10492 CheckDestructorAccess(VD->getLocation(), Destructor,
10493 PDiag(diag::err_access_dtor_var)
10494 << VD->getDeclName()
10496 DiagnoseUseOfDecl(Destructor, VD->getLocation());
10498 if (!VD->hasGlobalStorage()) return;
10500 // Emit warning for non-trivial dtor in global scope (a real global,
10501 // class-static, function-static).
10502 Diag(VD->getLocation(), diag::warn_exit_time_destructor);
10504 // TODO: this should be re-enabled for static locals by !CXAAtExit
10505 if (!VD->isStaticLocal())
10506 Diag(VD->getLocation(), diag::warn_global_destructor);
10509 /// \brief Given a constructor and the set of arguments provided for the
10510 /// constructor, convert the arguments and add any required default arguments
10511 /// to form a proper call to this constructor.
10513 /// \returns true if an error occurred, false otherwise.
10515 Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor,
10516 MultiExprArg ArgsPtr,
10517 SourceLocation Loc,
10518 SmallVectorImpl<Expr*> &ConvertedArgs,
10519 bool AllowExplicit,
10520 bool IsListInitialization) {
10521 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall.
10522 unsigned NumArgs = ArgsPtr.size();
10523 Expr **Args = ArgsPtr.data();
10525 const FunctionProtoType *Proto
10526 = Constructor->getType()->getAs<FunctionProtoType>();
10527 assert(Proto && "Constructor without a prototype?");
10528 unsigned NumArgsInProto = Proto->getNumArgs();
10530 // If too few arguments are available, we'll fill in the rest with defaults.
10531 if (NumArgs < NumArgsInProto)
10532 ConvertedArgs.reserve(NumArgsInProto);
10534 ConvertedArgs.reserve(NumArgs);
10536 VariadicCallType CallType =
10537 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;
10538 SmallVector<Expr *, 8> AllArgs;
10539 bool Invalid = GatherArgumentsForCall(Loc, Constructor,
10541 llvm::makeArrayRef(Args, NumArgs),
10543 CallType, AllowExplicit,
10544 IsListInitialization);
10545 ConvertedArgs.append(AllArgs.begin(), AllArgs.end());
10547 DiagnoseSentinelCalls(Constructor, Loc, AllArgs);
10549 CheckConstructorCall(Constructor,
10550 llvm::makeArrayRef<const Expr *>(AllArgs.data(),
10558 CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef,
10559 const FunctionDecl *FnDecl) {
10560 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext();
10561 if (isa<NamespaceDecl>(DC)) {
10562 return SemaRef.Diag(FnDecl->getLocation(),
10563 diag::err_operator_new_delete_declared_in_namespace)
10564 << FnDecl->getDeclName();
10567 if (isa<TranslationUnitDecl>(DC) &&
10568 FnDecl->getStorageClass() == SC_Static) {
10569 return SemaRef.Diag(FnDecl->getLocation(),
10570 diag::err_operator_new_delete_declared_static)
10571 << FnDecl->getDeclName();
10578 CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl,
10579 CanQualType ExpectedResultType,
10580 CanQualType ExpectedFirstParamType,
10581 unsigned DependentParamTypeDiag,
10582 unsigned InvalidParamTypeDiag) {
10583 QualType ResultType =
10584 FnDecl->getType()->getAs<FunctionType>()->getResultType();
10586 // Check that the result type is not dependent.
10587 if (ResultType->isDependentType())
10588 return SemaRef.Diag(FnDecl->getLocation(),
10589 diag::err_operator_new_delete_dependent_result_type)
10590 << FnDecl->getDeclName() << ExpectedResultType;
10592 // Check that the result type is what we expect.
10593 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType)
10594 return SemaRef.Diag(FnDecl->getLocation(),
10595 diag::err_operator_new_delete_invalid_result_type)
10596 << FnDecl->getDeclName() << ExpectedResultType;
10598 // A function template must have at least 2 parameters.
10599 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2)
10600 return SemaRef.Diag(FnDecl->getLocation(),
10601 diag::err_operator_new_delete_template_too_few_parameters)
10602 << FnDecl->getDeclName();
10604 // The function decl must have at least 1 parameter.
10605 if (FnDecl->getNumParams() == 0)
10606 return SemaRef.Diag(FnDecl->getLocation(),
10607 diag::err_operator_new_delete_too_few_parameters)
10608 << FnDecl->getDeclName();
10610 // Check the first parameter type is not dependent.
10611 QualType FirstParamType = FnDecl->getParamDecl(0)->getType();
10612 if (FirstParamType->isDependentType())
10613 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag)
10614 << FnDecl->getDeclName() << ExpectedFirstParamType;
10616 // Check that the first parameter type is what we expect.
10617 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() !=
10618 ExpectedFirstParamType)
10619 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag)
10620 << FnDecl->getDeclName() << ExpectedFirstParamType;
10626 CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
10627 // C++ [basic.stc.dynamic.allocation]p1:
10628 // A program is ill-formed if an allocation function is declared in a
10629 // namespace scope other than global scope or declared static in global
10631 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
10634 CanQualType SizeTy =
10635 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType());
10637 // C++ [basic.stc.dynamic.allocation]p1:
10638 // The return type shall be void*. The first parameter shall have type
10640 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy,
10642 diag::err_operator_new_dependent_param_type,
10643 diag::err_operator_new_param_type))
10646 // C++ [basic.stc.dynamic.allocation]p1:
10647 // The first parameter shall not have an associated default argument.
10648 if (FnDecl->getParamDecl(0)->hasDefaultArg())
10649 return SemaRef.Diag(FnDecl->getLocation(),
10650 diag::err_operator_new_default_arg)
10651 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange();
10657 CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) {
10658 // C++ [basic.stc.dynamic.deallocation]p1:
10659 // A program is ill-formed if deallocation functions are declared in a
10660 // namespace scope other than global scope or declared static in global
10662 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
10665 // C++ [basic.stc.dynamic.deallocation]p2:
10666 // Each deallocation function shall return void and its first parameter
10668 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy,
10669 SemaRef.Context.VoidPtrTy,
10670 diag::err_operator_delete_dependent_param_type,
10671 diag::err_operator_delete_param_type))
10677 /// CheckOverloadedOperatorDeclaration - Check whether the declaration
10678 /// of this overloaded operator is well-formed. If so, returns false;
10679 /// otherwise, emits appropriate diagnostics and returns true.
10680 bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
10681 assert(FnDecl && FnDecl->isOverloadedOperator() &&
10682 "Expected an overloaded operator declaration");
10684 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator();
10686 // C++ [over.oper]p5:
10687 // The allocation and deallocation functions, operator new,
10688 // operator new[], operator delete and operator delete[], are
10689 // described completely in 3.7.3. The attributes and restrictions
10690 // found in the rest of this subclause do not apply to them unless
10691 // explicitly stated in 3.7.3.
10692 if (Op == OO_Delete || Op == OO_Array_Delete)
10693 return CheckOperatorDeleteDeclaration(*this, FnDecl);
10695 if (Op == OO_New || Op == OO_Array_New)
10696 return CheckOperatorNewDeclaration(*this, FnDecl);
10698 // C++ [over.oper]p6:
10699 // An operator function shall either be a non-static member
10700 // function or be a non-member function and have at least one
10701 // parameter whose type is a class, a reference to a class, an
10702 // enumeration, or a reference to an enumeration.
10703 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) {
10704 if (MethodDecl->isStatic())
10705 return Diag(FnDecl->getLocation(),
10706 diag::err_operator_overload_static) << FnDecl->getDeclName();
10708 bool ClassOrEnumParam = false;
10709 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(),
10710 ParamEnd = FnDecl->param_end();
10711 Param != ParamEnd; ++Param) {
10712 QualType ParamType = (*Param)->getType().getNonReferenceType();
10713 if (ParamType->isDependentType() || ParamType->isRecordType() ||
10714 ParamType->isEnumeralType()) {
10715 ClassOrEnumParam = true;
10720 if (!ClassOrEnumParam)
10721 return Diag(FnDecl->getLocation(),
10722 diag::err_operator_overload_needs_class_or_enum)
10723 << FnDecl->getDeclName();
10726 // C++ [over.oper]p8:
10727 // An operator function cannot have default arguments (8.3.6),
10728 // except where explicitly stated below.
10730 // Only the function-call operator allows default arguments
10731 // (C++ [over.call]p1).
10732 if (Op != OO_Call) {
10733 for (FunctionDecl::param_iterator Param = FnDecl->param_begin();
10734 Param != FnDecl->param_end(); ++Param) {
10735 if ((*Param)->hasDefaultArg())
10736 return Diag((*Param)->getLocation(),
10737 diag::err_operator_overload_default_arg)
10738 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange();
10742 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = {
10743 { false, false, false }
10744 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
10745 , { Unary, Binary, MemberOnly }
10746 #include "clang/Basic/OperatorKinds.def"
10749 bool CanBeUnaryOperator = OperatorUses[Op][0];
10750 bool CanBeBinaryOperator = OperatorUses[Op][1];
10751 bool MustBeMemberOperator = OperatorUses[Op][2];
10753 // C++ [over.oper]p8:
10754 // [...] Operator functions cannot have more or fewer parameters
10755 // than the number required for the corresponding operator, as
10756 // described in the rest of this subclause.
10757 unsigned NumParams = FnDecl->getNumParams()
10758 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0);
10759 if (Op != OO_Call &&
10760 ((NumParams == 1 && !CanBeUnaryOperator) ||
10761 (NumParams == 2 && !CanBeBinaryOperator) ||
10762 (NumParams < 1) || (NumParams > 2))) {
10763 // We have the wrong number of parameters.
10764 unsigned ErrorKind;
10765 if (CanBeUnaryOperator && CanBeBinaryOperator) {
10766 ErrorKind = 2; // 2 -> unary or binary.
10767 } else if (CanBeUnaryOperator) {
10768 ErrorKind = 0; // 0 -> unary
10770 assert(CanBeBinaryOperator &&
10771 "All non-call overloaded operators are unary or binary!");
10772 ErrorKind = 1; // 1 -> binary
10775 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be)
10776 << FnDecl->getDeclName() << NumParams << ErrorKind;
10779 // Overloaded operators other than operator() cannot be variadic.
10780 if (Op != OO_Call &&
10781 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) {
10782 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic)
10783 << FnDecl->getDeclName();
10786 // Some operators must be non-static member functions.
10787 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) {
10788 return Diag(FnDecl->getLocation(),
10789 diag::err_operator_overload_must_be_member)
10790 << FnDecl->getDeclName();
10793 // C++ [over.inc]p1:
10794 // The user-defined function called operator++ implements the
10795 // prefix and postfix ++ operator. If this function is a member
10796 // function with no parameters, or a non-member function with one
10797 // parameter of class or enumeration type, it defines the prefix
10798 // increment operator ++ for objects of that type. If the function
10799 // is a member function with one parameter (which shall be of type
10800 // int) or a non-member function with two parameters (the second
10801 // of which shall be of type int), it defines the postfix
10802 // increment operator ++ for objects of that type.
10803 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) {
10804 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1);
10805 bool ParamIsInt = false;
10806 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>())
10807 ParamIsInt = BT->getKind() == BuiltinType::Int;
10810 return Diag(LastParam->getLocation(),
10811 diag::err_operator_overload_post_incdec_must_be_int)
10812 << LastParam->getType() << (Op == OO_MinusMinus);
10818 /// CheckLiteralOperatorDeclaration - Check whether the declaration
10819 /// of this literal operator function is well-formed. If so, returns
10820 /// false; otherwise, emits appropriate diagnostics and returns true.
10821 bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) {
10822 if (isa<CXXMethodDecl>(FnDecl)) {
10823 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace)
10824 << FnDecl->getDeclName();
10828 if (FnDecl->isExternC()) {
10829 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c);
10833 bool Valid = false;
10835 // This might be the definition of a literal operator template.
10836 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate();
10837 // This might be a specialization of a literal operator template.
10839 TpDecl = FnDecl->getPrimaryTemplate();
10841 // template <char...> type operator "" name() and
10842 // template <class T, T...> type operator "" name() are the only valid
10843 // template signatures, and the only valid signatures with no parameters.
10845 if (FnDecl->param_size() == 0) {
10846 // Must have one or two template parameters
10847 TemplateParameterList *Params = TpDecl->getTemplateParameters();
10848 if (Params->size() == 1) {
10849 NonTypeTemplateParmDecl *PmDecl =
10850 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0));
10852 // The template parameter must be a char parameter pack.
10853 if (PmDecl && PmDecl->isTemplateParameterPack() &&
10854 Context.hasSameType(PmDecl->getType(), Context.CharTy))
10856 } else if (Params->size() == 2) {
10857 TemplateTypeParmDecl *PmType =
10858 dyn_cast<TemplateTypeParmDecl>(Params->getParam(0));
10859 NonTypeTemplateParmDecl *PmArgs =
10860 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(1));
10862 // The second template parameter must be a parameter pack with the
10863 // first template parameter as its type.
10864 if (PmType && PmArgs &&
10865 !PmType->isTemplateParameterPack() &&
10866 PmArgs->isTemplateParameterPack()) {
10867 const TemplateTypeParmType *TArgs =
10868 PmArgs->getType()->getAs<TemplateTypeParmType>();
10869 if (TArgs && TArgs->getDepth() == PmType->getDepth() &&
10870 TArgs->getIndex() == PmType->getIndex()) {
10872 if (ActiveTemplateInstantiations.empty())
10873 Diag(FnDecl->getLocation(),
10874 diag::ext_string_literal_operator_template);
10879 } else if (FnDecl->param_size()) {
10880 // Check the first parameter
10881 FunctionDecl::param_iterator Param = FnDecl->param_begin();
10883 QualType T = (*Param)->getType().getUnqualifiedType();
10885 // unsigned long long int, long double, and any character type are allowed
10886 // as the only parameters.
10887 if (Context.hasSameType(T, Context.UnsignedLongLongTy) ||
10888 Context.hasSameType(T, Context.LongDoubleTy) ||
10889 Context.hasSameType(T, Context.CharTy) ||
10890 Context.hasSameType(T, Context.WideCharTy) ||
10891 Context.hasSameType(T, Context.Char16Ty) ||
10892 Context.hasSameType(T, Context.Char32Ty)) {
10893 if (++Param == FnDecl->param_end())
10895 goto FinishedParams;
10898 // Otherwise it must be a pointer to const; let's strip those qualifiers.
10899 const PointerType *PT = T->getAs<PointerType>();
10901 goto FinishedParams;
10902 T = PT->getPointeeType();
10903 if (!T.isConstQualified() || T.isVolatileQualified())
10904 goto FinishedParams;
10905 T = T.getUnqualifiedType();
10907 // Move on to the second parameter;
10910 // If there is no second parameter, the first must be a const char *
10911 if (Param == FnDecl->param_end()) {
10912 if (Context.hasSameType(T, Context.CharTy))
10914 goto FinishedParams;
10917 // const char *, const wchar_t*, const char16_t*, and const char32_t*
10918 // are allowed as the first parameter to a two-parameter function
10919 if (!(Context.hasSameType(T, Context.CharTy) ||
10920 Context.hasSameType(T, Context.WideCharTy) ||
10921 Context.hasSameType(T, Context.Char16Ty) ||
10922 Context.hasSameType(T, Context.Char32Ty)))
10923 goto FinishedParams;
10925 // The second and final parameter must be an std::size_t
10926 T = (*Param)->getType().getUnqualifiedType();
10927 if (Context.hasSameType(T, Context.getSizeType()) &&
10928 ++Param == FnDecl->param_end())
10932 // FIXME: This diagnostic is absolutely terrible.
10935 Diag(FnDecl->getLocation(), diag::err_literal_operator_params)
10936 << FnDecl->getDeclName();
10940 // A parameter-declaration-clause containing a default argument is not
10941 // equivalent to any of the permitted forms.
10942 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(),
10943 ParamEnd = FnDecl->param_end();
10944 Param != ParamEnd; ++Param) {
10945 if ((*Param)->hasDefaultArg()) {
10946 Diag((*Param)->getDefaultArgRange().getBegin(),
10947 diag::err_literal_operator_default_argument)
10948 << (*Param)->getDefaultArgRange();
10953 StringRef LiteralName
10954 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName();
10955 if (LiteralName[0] != '_') {
10956 // C++11 [usrlit.suffix]p1:
10957 // Literal suffix identifiers that do not start with an underscore
10958 // are reserved for future standardization.
10959 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved)
10960 << NumericLiteralParser::isValidUDSuffix(getLangOpts(), LiteralName);
10966 /// ActOnStartLinkageSpecification - Parsed the beginning of a C++
10967 /// linkage specification, including the language and (if present)
10968 /// the '{'. ExternLoc is the location of the 'extern', LangLoc is
10969 /// the location of the language string literal, which is provided
10970 /// by Lang/StrSize. LBraceLoc, if valid, provides the location of
10971 /// the '{' brace. Otherwise, this linkage specification does not
10972 /// have any braces.
10973 Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc,
10974 SourceLocation LangLoc,
10976 SourceLocation LBraceLoc) {
10977 LinkageSpecDecl::LanguageIDs Language;
10978 if (Lang == "\"C\"")
10979 Language = LinkageSpecDecl::lang_c;
10980 else if (Lang == "\"C++\"")
10981 Language = LinkageSpecDecl::lang_cxx;
10983 Diag(LangLoc, diag::err_bad_language);
10987 // FIXME: Add all the various semantics of linkage specifications
10989 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext,
10990 ExternLoc, LangLoc, Language,
10991 LBraceLoc.isValid());
10992 CurContext->addDecl(D);
10993 PushDeclContext(S, D);
10997 /// ActOnFinishLinkageSpecification - Complete the definition of
10998 /// the C++ linkage specification LinkageSpec. If RBraceLoc is
10999 /// valid, it's the position of the closing '}' brace in a linkage
11000 /// specification that uses braces.
11001 Decl *Sema::ActOnFinishLinkageSpecification(Scope *S,
11003 SourceLocation RBraceLoc) {
11005 if (RBraceLoc.isValid()) {
11006 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec);
11007 LSDecl->setRBraceLoc(RBraceLoc);
11011 return LinkageSpec;
11014 Decl *Sema::ActOnEmptyDeclaration(Scope *S,
11015 AttributeList *AttrList,
11016 SourceLocation SemiLoc) {
11017 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc);
11018 // Attribute declarations appertain to empty declaration so we handle
11021 ProcessDeclAttributeList(S, ED, AttrList);
11023 CurContext->addDecl(ED);
11027 /// \brief Perform semantic analysis for the variable declaration that
11028 /// occurs within a C++ catch clause, returning the newly-created
11030 VarDecl *Sema::BuildExceptionDeclaration(Scope *S,
11031 TypeSourceInfo *TInfo,
11032 SourceLocation StartLoc,
11033 SourceLocation Loc,
11034 IdentifierInfo *Name) {
11035 bool Invalid = false;
11036 QualType ExDeclType = TInfo->getType();
11038 // Arrays and functions decay.
11039 if (ExDeclType->isArrayType())
11040 ExDeclType = Context.getArrayDecayedType(ExDeclType);
11041 else if (ExDeclType->isFunctionType())
11042 ExDeclType = Context.getPointerType(ExDeclType);
11044 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type.
11045 // The exception-declaration shall not denote a pointer or reference to an
11046 // incomplete type, other than [cv] void*.
11047 // N2844 forbids rvalue references.
11048 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) {
11049 Diag(Loc, diag::err_catch_rvalue_ref);
11053 QualType BaseType = ExDeclType;
11054 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference
11055 unsigned DK = diag::err_catch_incomplete;
11056 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
11057 BaseType = Ptr->getPointeeType();
11059 DK = diag::err_catch_incomplete_ptr;
11060 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) {
11061 // For the purpose of error recovery, we treat rvalue refs like lvalue refs.
11062 BaseType = Ref->getPointeeType();
11064 DK = diag::err_catch_incomplete_ref;
11066 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) &&
11067 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK))
11070 if (!Invalid && !ExDeclType->isDependentType() &&
11071 RequireNonAbstractType(Loc, ExDeclType,
11072 diag::err_abstract_type_in_decl,
11073 AbstractVariableType))
11076 // Only the non-fragile NeXT runtime currently supports C++ catches
11077 // of ObjC types, and no runtime supports catching ObjC types by value.
11078 if (!Invalid && getLangOpts().ObjC1) {
11079 QualType T = ExDeclType;
11080 if (const ReferenceType *RT = T->getAs<ReferenceType>())
11081 T = RT->getPointeeType();
11083 if (T->isObjCObjectType()) {
11084 Diag(Loc, diag::err_objc_object_catch);
11086 } else if (T->isObjCObjectPointerType()) {
11087 // FIXME: should this be a test for macosx-fragile specifically?
11088 if (getLangOpts().ObjCRuntime.isFragile())
11089 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile);
11093 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name,
11094 ExDeclType, TInfo, SC_None);
11095 ExDecl->setExceptionVariable(true);
11097 // In ARC, infer 'retaining' for variables of retainable type.
11098 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl))
11101 if (!Invalid && !ExDeclType->isDependentType()) {
11102 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) {
11103 // Insulate this from anything else we might currently be parsing.
11104 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated);
11106 // C++ [except.handle]p16:
11107 // The object declared in an exception-declaration or, if the
11108 // exception-declaration does not specify a name, a temporary (12.2) is
11109 // copy-initialized (8.5) from the exception object. [...]
11110 // The object is destroyed when the handler exits, after the destruction
11111 // of any automatic objects initialized within the handler.
11113 // We just pretend to initialize the object with itself, then make sure
11114 // it can be destroyed later.
11115 QualType initType = ExDeclType;
11117 InitializedEntity entity =
11118 InitializedEntity::InitializeVariable(ExDecl);
11119 InitializationKind initKind =
11120 InitializationKind::CreateCopy(Loc, SourceLocation());
11122 Expr *opaqueValue =
11123 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary);
11124 InitializationSequence sequence(*this, entity, initKind, opaqueValue);
11125 ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue);
11126 if (result.isInvalid())
11129 // If the constructor used was non-trivial, set this as the
11131 CXXConstructExpr *construct = result.takeAs<CXXConstructExpr>();
11132 if (!construct->getConstructor()->isTrivial()) {
11133 Expr *init = MaybeCreateExprWithCleanups(construct);
11134 ExDecl->setInit(init);
11137 // And make sure it's destructable.
11138 FinalizeVarWithDestructor(ExDecl, recordType);
11144 ExDecl->setInvalidDecl();
11149 /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
11151 Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
11152 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
11153 bool Invalid = D.isInvalidType();
11155 // Check for unexpanded parameter packs.
11156 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
11157 UPPC_ExceptionType)) {
11158 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
11159 D.getIdentifierLoc());
11163 IdentifierInfo *II = D.getIdentifier();
11164 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(),
11165 LookupOrdinaryName,
11166 ForRedeclaration)) {
11167 // The scope should be freshly made just for us. There is just no way
11168 // it contains any previous declaration.
11169 assert(!S->isDeclScope(PrevDecl));
11170 if (PrevDecl->isTemplateParameter()) {
11171 // Maybe we will complain about the shadowed template parameter.
11172 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
11177 if (D.getCXXScopeSpec().isSet() && !Invalid) {
11178 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator)
11179 << D.getCXXScopeSpec().getRange();
11183 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo,
11185 D.getIdentifierLoc(),
11186 D.getIdentifier());
11188 ExDecl->setInvalidDecl();
11190 // Add the exception declaration into this scope.
11192 PushOnScopeChains(ExDecl, S);
11194 CurContext->addDecl(ExDecl);
11196 ProcessDeclAttributes(S, ExDecl, D);
11200 Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc,
11202 Expr *AssertMessageExpr,
11203 SourceLocation RParenLoc) {
11204 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr);
11206 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression))
11209 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr,
11210 AssertMessage, RParenLoc, false);
11213 Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc,
11215 StringLiteral *AssertMessage,
11216 SourceLocation RParenLoc,
11218 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() &&
11220 // In a static_assert-declaration, the constant-expression shall be a
11221 // constant expression that can be contextually converted to bool.
11222 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr);
11223 if (Converted.isInvalid())
11227 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond,
11228 diag::err_static_assert_expression_is_not_constant,
11229 /*AllowFold=*/false).isInvalid())
11232 if (!Failed && !Cond) {
11233 SmallString<256> MsgBuffer;
11234 llvm::raw_svector_ostream Msg(MsgBuffer);
11235 AssertMessage->printPretty(Msg, 0, getPrintingPolicy());
11236 Diag(StaticAssertLoc, diag::err_static_assert_failed)
11237 << Msg.str() << AssertExpr->getSourceRange();
11242 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc,
11243 AssertExpr, AssertMessage, RParenLoc,
11246 CurContext->addDecl(Decl);
11250 /// \brief Perform semantic analysis of the given friend type declaration.
11252 /// \returns A friend declaration that.
11253 FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart,
11254 SourceLocation FriendLoc,
11255 TypeSourceInfo *TSInfo) {
11256 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration");
11258 QualType T = TSInfo->getType();
11259 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange();
11261 // C++03 [class.friend]p2:
11262 // An elaborated-type-specifier shall be used in a friend declaration
11265 // * The class-key of the elaborated-type-specifier is required.
11266 if (!ActiveTemplateInstantiations.empty()) {
11267 // Do not complain about the form of friend template types during
11268 // template instantiation; we will already have complained when the
11269 // template was declared.
11271 if (!T->isElaboratedTypeSpecifier()) {
11272 // If we evaluated the type to a record type, suggest putting
11274 if (const RecordType *RT = T->getAs<RecordType>()) {
11275 RecordDecl *RD = RT->getDecl();
11277 std::string InsertionText = std::string(" ") + RD->getKindName();
11279 Diag(TypeRange.getBegin(),
11280 getLangOpts().CPlusPlus11 ?
11281 diag::warn_cxx98_compat_unelaborated_friend_type :
11282 diag::ext_unelaborated_friend_type)
11283 << (unsigned) RD->getTagKind()
11285 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc),
11289 getLangOpts().CPlusPlus11 ?
11290 diag::warn_cxx98_compat_nonclass_type_friend :
11291 diag::ext_nonclass_type_friend)
11295 } else if (T->getAs<EnumType>()) {
11297 getLangOpts().CPlusPlus11 ?
11298 diag::warn_cxx98_compat_enum_friend :
11299 diag::ext_enum_friend)
11304 // C++11 [class.friend]p3:
11305 // A friend declaration that does not declare a function shall have one
11306 // of the following forms:
11307 // friend elaborated-type-specifier ;
11308 // friend simple-type-specifier ;
11309 // friend typename-specifier ;
11310 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc)
11311 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T;
11314 // If the type specifier in a friend declaration designates a (possibly
11315 // cv-qualified) class type, that class is declared as a friend; otherwise,
11316 // the friend declaration is ignored.
11317 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc);
11320 /// Handle a friend tag declaration where the scope specifier was
11322 Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc,
11323 unsigned TagSpec, SourceLocation TagLoc,
11325 IdentifierInfo *Name,
11326 SourceLocation NameLoc,
11327 AttributeList *Attr,
11328 MultiTemplateParamsArg TempParamLists) {
11329 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
11331 bool isExplicitSpecialization = false;
11332 bool Invalid = false;
11334 if (TemplateParameterList *TemplateParams =
11335 MatchTemplateParametersToScopeSpecifier(
11336 TagLoc, NameLoc, SS, TempParamLists, /*friend*/ true,
11337 isExplicitSpecialization, Invalid)) {
11338 if (TemplateParams->size() > 0) {
11339 // This is a declaration of a class template.
11343 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc,
11344 SS, Name, NameLoc, Attr,
11345 TemplateParams, AS_public,
11346 /*ModulePrivateLoc=*/SourceLocation(),
11347 TempParamLists.size() - 1,
11348 TempParamLists.data()).take();
11350 // The "template<>" header is extraneous.
11351 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
11352 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
11353 isExplicitSpecialization = true;
11357 if (Invalid) return 0;
11359 bool isAllExplicitSpecializations = true;
11360 for (unsigned I = TempParamLists.size(); I-- > 0; ) {
11361 if (TempParamLists[I]->size()) {
11362 isAllExplicitSpecializations = false;
11367 // FIXME: don't ignore attributes.
11369 // If it's explicit specializations all the way down, just forget
11370 // about the template header and build an appropriate non-templated
11371 // friend. TODO: for source fidelity, remember the headers.
11372 if (isAllExplicitSpecializations) {
11373 if (SS.isEmpty()) {
11374 bool Owned = false;
11375 bool IsDependent = false;
11376 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc,
11378 /*ModulePrivateLoc=*/SourceLocation(),
11379 MultiTemplateParamsArg(), Owned, IsDependent,
11380 /*ScopedEnumKWLoc=*/SourceLocation(),
11381 /*ScopedEnumUsesClassTag=*/false,
11382 /*UnderlyingType=*/TypeResult());
11385 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
11386 ElaboratedTypeKeyword Keyword
11387 = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
11388 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc,
11393 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
11394 if (isa<DependentNameType>(T)) {
11395 DependentNameTypeLoc TL =
11396 TSI->getTypeLoc().castAs<DependentNameTypeLoc>();
11397 TL.setElaboratedKeywordLoc(TagLoc);
11398 TL.setQualifierLoc(QualifierLoc);
11399 TL.setNameLoc(NameLoc);
11401 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>();
11402 TL.setElaboratedKeywordLoc(TagLoc);
11403 TL.setQualifierLoc(QualifierLoc);
11404 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc);
11407 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
11408 TSI, FriendLoc, TempParamLists);
11409 Friend->setAccess(AS_public);
11410 CurContext->addDecl(Friend);
11414 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?");
11418 // Handle the case of a templated-scope friend class. e.g.
11419 // template <class T> class A<T>::B;
11420 // FIXME: we don't support these right now.
11421 Diag(NameLoc, diag::warn_template_qualified_friend_unsupported)
11422 << SS.getScopeRep() << SS.getRange() << cast<CXXRecordDecl>(CurContext);
11423 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
11424 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name);
11425 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
11426 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>();
11427 TL.setElaboratedKeywordLoc(TagLoc);
11428 TL.setQualifierLoc(SS.getWithLocInContext(Context));
11429 TL.setNameLoc(NameLoc);
11431 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
11432 TSI, FriendLoc, TempParamLists);
11433 Friend->setAccess(AS_public);
11434 Friend->setUnsupportedFriend(true);
11435 CurContext->addDecl(Friend);
11440 /// Handle a friend type declaration. This works in tandem with
11443 /// Notes on friend class templates:
11445 /// We generally treat friend class declarations as if they were
11446 /// declaring a class. So, for example, the elaborated type specifier
11447 /// in a friend declaration is required to obey the restrictions of a
11448 /// class-head (i.e. no typedefs in the scope chain), template
11449 /// parameters are required to match up with simple template-ids, &c.
11450 /// However, unlike when declaring a template specialization, it's
11451 /// okay to refer to a template specialization without an empty
11452 /// template parameter declaration, e.g.
11453 /// friend class A<T>::B<unsigned>;
11454 /// We permit this as a special case; if there are any template
11455 /// parameters present at all, require proper matching, i.e.
11456 /// template <> template \<class T> friend class A<int>::B;
11457 Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
11458 MultiTemplateParamsArg TempParams) {
11459 SourceLocation Loc = DS.getLocStart();
11461 assert(DS.isFriendSpecified());
11462 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
11464 // Try to convert the decl specifier to a type. This works for
11465 // friend templates because ActOnTag never produces a ClassTemplateDecl
11466 // for a TUK_Friend.
11467 Declarator TheDeclarator(DS, Declarator::MemberContext);
11468 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S);
11469 QualType T = TSI->getType();
11470 if (TheDeclarator.isInvalidType())
11473 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration))
11476 // This is definitely an error in C++98. It's probably meant to
11477 // be forbidden in C++0x, too, but the specification is just
11480 // The problem is with declarations like the following:
11481 // template <T> friend A<T>::foo;
11482 // where deciding whether a class C is a friend or not now hinges
11483 // on whether there exists an instantiation of A that causes
11484 // 'foo' to equal C. There are restrictions on class-heads
11485 // (which we declare (by fiat) elaborated friend declarations to
11486 // be) that makes this tractable.
11488 // FIXME: handle "template <> friend class A<T>;", which
11489 // is possibly well-formed? Who even knows?
11490 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) {
11491 Diag(Loc, diag::err_tagless_friend_type_template)
11492 << DS.getSourceRange();
11496 // C++98 [class.friend]p1: A friend of a class is a function
11497 // or class that is not a member of the class . . .
11498 // This is fixed in DR77, which just barely didn't make the C++03
11499 // deadline. It's also a very silly restriction that seriously
11500 // affects inner classes and which nobody else seems to implement;
11501 // thus we never diagnose it, not even in -pedantic.
11503 // But note that we could warn about it: it's always useless to
11504 // friend one of your own members (it's not, however, worthless to
11505 // friend a member of an arbitrary specialization of your template).
11508 if (unsigned NumTempParamLists = TempParams.size())
11509 D = FriendTemplateDecl::Create(Context, CurContext, Loc,
11513 DS.getFriendSpecLoc());
11515 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI);
11520 D->setAccess(AS_public);
11521 CurContext->addDecl(D);
11526 NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D,
11527 MultiTemplateParamsArg TemplateParams) {
11528 const DeclSpec &DS = D.getDeclSpec();
11530 assert(DS.isFriendSpecified());
11531 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
11533 SourceLocation Loc = D.getIdentifierLoc();
11534 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
11536 // C++ [class.friend]p1
11537 // A friend of a class is a function or class....
11538 // Note that this sees through typedefs, which is intended.
11539 // It *doesn't* see through dependent types, which is correct
11540 // according to [temp.arg.type]p3:
11541 // If a declaration acquires a function type through a
11542 // type dependent on a template-parameter and this causes
11543 // a declaration that does not use the syntactic form of a
11544 // function declarator to have a function type, the program
11546 if (!TInfo->getType()->isFunctionType()) {
11547 Diag(Loc, diag::err_unexpected_friend);
11549 // It might be worthwhile to try to recover by creating an
11550 // appropriate declaration.
11554 // C++ [namespace.memdef]p3
11555 // - If a friend declaration in a non-local class first declares a
11556 // class or function, the friend class or function is a member
11557 // of the innermost enclosing namespace.
11558 // - The name of the friend is not found by simple name lookup
11559 // until a matching declaration is provided in that namespace
11560 // scope (either before or after the class declaration granting
11562 // - If a friend function is called, its name may be found by the
11563 // name lookup that considers functions from namespaces and
11564 // classes associated with the types of the function arguments.
11565 // - When looking for a prior declaration of a class or a function
11566 // declared as a friend, scopes outside the innermost enclosing
11567 // namespace scope are not considered.
11569 CXXScopeSpec &SS = D.getCXXScopeSpec();
11570 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
11571 DeclarationName Name = NameInfo.getName();
11574 // Check for unexpanded parameter packs.
11575 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) ||
11576 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) ||
11577 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration))
11580 // The context we found the declaration in, or in which we should
11581 // create the declaration.
11583 Scope *DCScope = S;
11584 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
11587 // There are five cases here.
11588 // - There's no scope specifier and we're in a local class. Only look
11589 // for functions declared in the immediately-enclosing block scope.
11590 // We recover from invalid scope qualifiers as if they just weren't there.
11591 FunctionDecl *FunctionContainingLocalClass = 0;
11592 if ((SS.isInvalid() || !SS.isSet()) &&
11593 (FunctionContainingLocalClass =
11594 cast<CXXRecordDecl>(CurContext)->isLocalClass())) {
11595 // C++11 [class.friend]p11:
11596 // If a friend declaration appears in a local class and the name
11597 // specified is an unqualified name, a prior declaration is
11598 // looked up without considering scopes that are outside the
11599 // innermost enclosing non-class scope. For a friend function
11600 // declaration, if there is no prior declaration, the program is
11603 // Find the innermost enclosing non-class scope. This is the block
11604 // scope containing the local class definition (or for a nested class,
11605 // the outer local class).
11606 DCScope = S->getFnParent();
11608 // Look up the function name in the scope.
11609 Previous.clear(LookupLocalFriendName);
11610 LookupName(Previous, S, /*AllowBuiltinCreation*/false);
11612 if (!Previous.empty()) {
11613 // All possible previous declarations must have the same context:
11614 // either they were declared at block scope or they are members of
11615 // one of the enclosing local classes.
11616 DC = Previous.getRepresentativeDecl()->getDeclContext();
11618 // This is ill-formed, but provide the context that we would have
11619 // declared the function in, if we were permitted to, for error recovery.
11620 DC = FunctionContainingLocalClass;
11622 adjustContextForLocalExternDecl(DC);
11624 // C++ [class.friend]p6:
11625 // A function can be defined in a friend declaration of a class if and
11626 // only if the class is a non-local class (9.8), the function name is
11627 // unqualified, and the function has namespace scope.
11628 if (D.isFunctionDefinition()) {
11629 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class);
11632 // - There's no scope specifier, in which case we just go to the
11633 // appropriate scope and look for a function or function template
11634 // there as appropriate.
11635 } else if (SS.isInvalid() || !SS.isSet()) {
11636 // C++11 [namespace.memdef]p3:
11637 // If the name in a friend declaration is neither qualified nor
11638 // a template-id and the declaration is a function or an
11639 // elaborated-type-specifier, the lookup to determine whether
11640 // the entity has been previously declared shall not consider
11641 // any scopes outside the innermost enclosing namespace.
11642 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId;
11644 // Find the appropriate context according to the above.
11647 // Skip class contexts. If someone can cite chapter and verse
11648 // for this behavior, that would be nice --- it's what GCC and
11649 // EDG do, and it seems like a reasonable intent, but the spec
11650 // really only says that checks for unqualified existing
11651 // declarations should stop at the nearest enclosing namespace,
11652 // not that they should only consider the nearest enclosing
11654 while (DC->isRecord())
11655 DC = DC->getParent();
11657 DeclContext *LookupDC = DC;
11658 while (LookupDC->isTransparentContext())
11659 LookupDC = LookupDC->getParent();
11662 LookupQualifiedName(Previous, LookupDC);
11664 if (!Previous.empty()) {
11669 if (isTemplateId) {
11670 if (isa<TranslationUnitDecl>(LookupDC)) break;
11672 if (LookupDC->isFileContext()) break;
11674 LookupDC = LookupDC->getParent();
11677 DCScope = getScopeForDeclContext(S, DC);
11679 // - There's a non-dependent scope specifier, in which case we
11680 // compute it and do a previous lookup there for a function
11681 // or function template.
11682 } else if (!SS.getScopeRep()->isDependent()) {
11683 DC = computeDeclContext(SS);
11686 if (RequireCompleteDeclContext(SS, DC)) return 0;
11688 LookupQualifiedName(Previous, DC);
11690 // Ignore things found implicitly in the wrong scope.
11691 // TODO: better diagnostics for this case. Suggesting the right
11692 // qualified scope would be nice...
11693 LookupResult::Filter F = Previous.makeFilter();
11694 while (F.hasNext()) {
11695 NamedDecl *D = F.next();
11696 if (!DC->InEnclosingNamespaceSetOf(
11697 D->getDeclContext()->getRedeclContext()))
11702 if (Previous.empty()) {
11703 D.setInvalidType();
11704 Diag(Loc, diag::err_qualified_friend_not_found)
11705 << Name << TInfo->getType();
11709 // C++ [class.friend]p1: A friend of a class is a function or
11710 // class that is not a member of the class . . .
11711 if (DC->Equals(CurContext))
11712 Diag(DS.getFriendSpecLoc(),
11713 getLangOpts().CPlusPlus11 ?
11714 diag::warn_cxx98_compat_friend_is_member :
11715 diag::err_friend_is_member);
11717 if (D.isFunctionDefinition()) {
11718 // C++ [class.friend]p6:
11719 // A function can be defined in a friend declaration of a class if and
11720 // only if the class is a non-local class (9.8), the function name is
11721 // unqualified, and the function has namespace scope.
11722 SemaDiagnosticBuilder DB
11723 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def);
11725 DB << SS.getScopeRep();
11726 if (DC->isFileContext())
11727 DB << FixItHint::CreateRemoval(SS.getRange());
11731 // - There's a scope specifier that does not match any template
11732 // parameter lists, in which case we use some arbitrary context,
11733 // create a method or method template, and wait for instantiation.
11734 // - There's a scope specifier that does match some template
11735 // parameter lists, which we don't handle right now.
11737 if (D.isFunctionDefinition()) {
11738 // C++ [class.friend]p6:
11739 // A function can be defined in a friend declaration of a class if and
11740 // only if the class is a non-local class (9.8), the function name is
11741 // unqualified, and the function has namespace scope.
11742 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def)
11743 << SS.getScopeRep();
11747 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?");
11750 if (!DC->isRecord()) {
11751 // This implies that it has to be an operator or function.
11752 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ||
11753 D.getName().getKind() == UnqualifiedId::IK_DestructorName ||
11754 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) {
11755 Diag(Loc, diag::err_introducing_special_friend) <<
11756 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 :
11757 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2);
11762 // FIXME: This is an egregious hack to cope with cases where the scope stack
11763 // does not contain the declaration context, i.e., in an out-of-line
11764 // definition of a class.
11765 Scope FakeDCScope(S, Scope::DeclScope, Diags);
11767 FakeDCScope.setEntity(DC);
11768 DCScope = &FakeDCScope;
11771 bool AddToScope = true;
11772 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous,
11773 TemplateParams, AddToScope);
11776 assert(ND->getLexicalDeclContext() == CurContext);
11778 // If we performed typo correction, we might have added a scope specifier
11779 // and changed the decl context.
11780 DC = ND->getDeclContext();
11782 // Add the function declaration to the appropriate lookup tables,
11783 // adjusting the redeclarations list as necessary. We don't
11784 // want to do this yet if the friending class is dependent.
11786 // Also update the scope-based lookup if the target context's
11787 // lookup context is in lexical scope.
11788 if (!CurContext->isDependentContext()) {
11789 DC = DC->getRedeclContext();
11790 DC->makeDeclVisibleInContext(ND);
11791 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
11792 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false);
11795 FriendDecl *FrD = FriendDecl::Create(Context, CurContext,
11796 D.getIdentifierLoc(), ND,
11797 DS.getFriendSpecLoc());
11798 FrD->setAccess(AS_public);
11799 CurContext->addDecl(FrD);
11801 if (ND->isInvalidDecl()) {
11802 FrD->setInvalidDecl();
11804 if (DC->isRecord()) CheckFriendAccess(ND);
11807 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND))
11808 FD = FTD->getTemplatedDecl();
11810 FD = cast<FunctionDecl>(ND);
11812 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a
11813 // default argument expression, that declaration shall be a definition
11814 // and shall be the only declaration of the function or function
11815 // template in the translation unit.
11816 if (functionDeclHasDefaultArgument(FD)) {
11817 if (FunctionDecl *OldFD = FD->getPreviousDecl()) {
11818 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_redeclared);
11819 Diag(OldFD->getLocation(), diag::note_previous_declaration);
11820 } else if (!D.isFunctionDefinition())
11821 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_must_be_def);
11824 // Mark templated-scope function declarations as unsupported.
11825 if (FD->getNumTemplateParameterLists())
11826 FrD->setUnsupportedFriend(true);
11832 void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) {
11833 AdjustDeclIfTemplate(Dcl);
11835 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl);
11837 Diag(DelLoc, diag::err_deleted_non_function);
11841 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) {
11842 // Don't consider the implicit declaration we generate for explicit
11843 // specializations. FIXME: Do not generate these implicit declarations.
11844 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization
11845 || Prev->getPreviousDecl()) && !Prev->isDefined()) {
11846 Diag(DelLoc, diag::err_deleted_decl_not_first);
11847 Diag(Prev->getLocation(), diag::note_previous_declaration);
11849 // If the declaration wasn't the first, we delete the function anyway for
11851 Fn = Fn->getCanonicalDecl();
11854 if (Fn->isDeleted())
11857 // See if we're deleting a function which is already known to override a
11858 // non-deleted virtual function.
11859 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) {
11860 bool IssuedDiagnostic = false;
11861 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
11862 E = MD->end_overridden_methods();
11864 if (!(*MD->begin_overridden_methods())->isDeleted()) {
11865 if (!IssuedDiagnostic) {
11866 Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName();
11867 IssuedDiagnostic = true;
11869 Diag((*I)->getLocation(), diag::note_overridden_virtual_function);
11874 Fn->setDeletedAsWritten();
11877 void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) {
11878 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl);
11881 if (MD->getParent()->isDependentType()) {
11882 MD->setDefaulted();
11883 MD->setExplicitlyDefaulted();
11887 CXXSpecialMember Member = getSpecialMember(MD);
11888 if (Member == CXXInvalid) {
11889 if (!MD->isInvalidDecl())
11890 Diag(DefaultLoc, diag::err_default_special_members);
11894 MD->setDefaulted();
11895 MD->setExplicitlyDefaulted();
11897 // If this definition appears within the record, do the checking when
11898 // the record is complete.
11899 const FunctionDecl *Primary = MD;
11900 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern())
11901 // Find the uninstantiated declaration that actually had the '= default'
11903 Pattern->isDefined(Primary);
11905 // If the method was defaulted on its first declaration, we will have
11906 // already performed the checking in CheckCompletedCXXClass. Such a
11907 // declaration doesn't trigger an implicit definition.
11908 if (Primary == Primary->getCanonicalDecl())
11911 CheckExplicitlyDefaultedSpecialMember(MD);
11913 // The exception specification is needed because we are defining the
11915 ResolveExceptionSpec(DefaultLoc,
11916 MD->getType()->castAs<FunctionProtoType>());
11918 if (MD->isInvalidDecl())
11922 case CXXDefaultConstructor:
11923 DefineImplicitDefaultConstructor(DefaultLoc,
11924 cast<CXXConstructorDecl>(MD));
11926 case CXXCopyConstructor:
11927 DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD));
11929 case CXXCopyAssignment:
11930 DefineImplicitCopyAssignment(DefaultLoc, MD);
11932 case CXXDestructor:
11933 DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(MD));
11935 case CXXMoveConstructor:
11936 DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD));
11938 case CXXMoveAssignment:
11939 DefineImplicitMoveAssignment(DefaultLoc, MD);
11942 llvm_unreachable("Invalid special member.");
11945 Diag(DefaultLoc, diag::err_default_special_members);
11949 static void SearchForReturnInStmt(Sema &Self, Stmt *S) {
11950 for (Stmt::child_range CI = S->children(); CI; ++CI) {
11951 Stmt *SubStmt = *CI;
11954 if (isa<ReturnStmt>(SubStmt))
11955 Self.Diag(SubStmt->getLocStart(),
11956 diag::err_return_in_constructor_handler);
11957 if (!isa<Expr>(SubStmt))
11958 SearchForReturnInStmt(Self, SubStmt);
11962 void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) {
11963 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) {
11964 CXXCatchStmt *Handler = TryBlock->getHandler(I);
11965 SearchForReturnInStmt(*this, Handler);
11969 bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New,
11970 const CXXMethodDecl *Old) {
11971 const FunctionType *NewFT = New->getType()->getAs<FunctionType>();
11972 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>();
11974 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv();
11976 // If the calling conventions match, everything is fine
11977 if (NewCC == OldCC)
11980 Diag(New->getLocation(),
11981 diag::err_conflicting_overriding_cc_attributes)
11982 << New->getDeclName() << New->getType() << Old->getType();
11983 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
11987 bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
11988 const CXXMethodDecl *Old) {
11989 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType();
11990 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType();
11992 if (Context.hasSameType(NewTy, OldTy) ||
11993 NewTy->isDependentType() || OldTy->isDependentType())
11996 // Check if the return types are covariant
11997 QualType NewClassTy, OldClassTy;
11999 /// Both types must be pointers or references to classes.
12000 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) {
12001 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) {
12002 NewClassTy = NewPT->getPointeeType();
12003 OldClassTy = OldPT->getPointeeType();
12005 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) {
12006 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) {
12007 if (NewRT->getTypeClass() == OldRT->getTypeClass()) {
12008 NewClassTy = NewRT->getPointeeType();
12009 OldClassTy = OldRT->getPointeeType();
12014 // The return types aren't either both pointers or references to a class type.
12015 if (NewClassTy.isNull()) {
12016 Diag(New->getLocation(),
12017 diag::err_different_return_type_for_overriding_virtual_function)
12018 << New->getDeclName() << NewTy << OldTy;
12019 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
12024 // C++ [class.virtual]p6:
12025 // If the return type of D::f differs from the return type of B::f, the
12026 // class type in the return type of D::f shall be complete at the point of
12027 // declaration of D::f or shall be the class type D.
12028 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) {
12029 if (!RT->isBeingDefined() &&
12030 RequireCompleteType(New->getLocation(), NewClassTy,
12031 diag::err_covariant_return_incomplete,
12032 New->getDeclName()))
12036 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) {
12037 // Check if the new class derives from the old class.
12038 if (!IsDerivedFrom(NewClassTy, OldClassTy)) {
12039 Diag(New->getLocation(),
12040 diag::err_covariant_return_not_derived)
12041 << New->getDeclName() << NewTy << OldTy;
12042 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
12046 // Check if we the conversion from derived to base is valid.
12047 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy,
12048 diag::err_covariant_return_inaccessible_base,
12049 diag::err_covariant_return_ambiguous_derived_to_base_conv,
12050 // FIXME: Should this point to the return type?
12051 New->getLocation(), SourceRange(), New->getDeclName(), 0)) {
12052 // FIXME: this note won't trigger for delayed access control
12053 // diagnostics, and it's impossible to get an undelayed error
12054 // here from access control during the original parse because
12055 // the ParsingDeclSpec/ParsingDeclarator are still in scope.
12056 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
12061 // The qualifiers of the return types must be the same.
12062 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) {
12063 Diag(New->getLocation(),
12064 diag::err_covariant_return_type_different_qualifications)
12065 << New->getDeclName() << NewTy << OldTy;
12066 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
12071 // The new class type must have the same or less qualifiers as the old type.
12072 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) {
12073 Diag(New->getLocation(),
12074 diag::err_covariant_return_type_class_type_more_qualified)
12075 << New->getDeclName() << NewTy << OldTy;
12076 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
12083 /// \brief Mark the given method pure.
12085 /// \param Method the method to be marked pure.
12087 /// \param InitRange the source range that covers the "0" initializer.
12088 bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) {
12089 SourceLocation EndLoc = InitRange.getEnd();
12090 if (EndLoc.isValid())
12091 Method->setRangeEnd(EndLoc);
12093 if (Method->isVirtual() || Method->getParent()->isDependentContext()) {
12098 if (!Method->isInvalidDecl())
12099 Diag(Method->getLocation(), diag::err_non_virtual_pure)
12100 << Method->getDeclName() << InitRange;
12104 /// \brief Determine whether the given declaration is a static data member.
12105 static bool isStaticDataMember(const Decl *D) {
12106 if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(D))
12107 return Var->isStaticDataMember();
12112 /// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse
12113 /// an initializer for the out-of-line declaration 'Dcl'. The scope
12114 /// is a fresh scope pushed for just this purpose.
12116 /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
12117 /// static data member of class X, names should be looked up in the scope of
12119 void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) {
12120 // If there is no declaration, there was an error parsing it.
12121 if (D == 0 || D->isInvalidDecl()) return;
12123 // We should only get called for declarations with scope specifiers, like:
12125 assert(D->isOutOfLine());
12126 EnterDeclaratorContext(S, D->getDeclContext());
12128 // If we are parsing the initializer for a static data member, push a
12129 // new expression evaluation context that is associated with this static
12131 if (isStaticDataMember(D))
12132 PushExpressionEvaluationContext(PotentiallyEvaluated, D);
12135 /// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an
12136 /// initializer for the out-of-line declaration 'D'.
12137 void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) {
12138 // If there is no declaration, there was an error parsing it.
12139 if (D == 0 || D->isInvalidDecl()) return;
12141 if (isStaticDataMember(D))
12142 PopExpressionEvaluationContext();
12144 assert(D->isOutOfLine());
12145 ExitDeclaratorContext(S);
12148 /// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a
12149 /// C++ if/switch/while/for statement.
12150 /// e.g: "if (int x = f()) {...}"
12151 DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) {
12153 // The declarator shall not specify a function or an array.
12154 // The type-specifier-seq shall not contain typedef and shall not declare a
12155 // new class or enumeration.
12156 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
12157 "Parser allowed 'typedef' as storage class of condition decl.");
12159 Decl *Dcl = ActOnDeclarator(S, D);
12163 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function.
12164 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type)
12165 << D.getSourceRange();
12172 void Sema::LoadExternalVTableUses() {
12173 if (!ExternalSource)
12176 SmallVector<ExternalVTableUse, 4> VTables;
12177 ExternalSource->ReadUsedVTables(VTables);
12178 SmallVector<VTableUse, 4> NewUses;
12179 for (unsigned I = 0, N = VTables.size(); I != N; ++I) {
12180 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos
12181 = VTablesUsed.find(VTables[I].Record);
12182 // Even if a definition wasn't required before, it may be required now.
12183 if (Pos != VTablesUsed.end()) {
12184 if (!Pos->second && VTables[I].DefinitionRequired)
12185 Pos->second = true;
12189 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired;
12190 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location));
12193 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end());
12196 void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class,
12197 bool DefinitionRequired) {
12198 // Ignore any vtable uses in unevaluated operands or for classes that do
12199 // not have a vtable.
12200 if (!Class->isDynamicClass() || Class->isDependentContext() ||
12201 CurContext->isDependentContext() || isUnevaluatedContext())
12204 // Try to insert this class into the map.
12205 LoadExternalVTableUses();
12206 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl());
12207 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool>
12208 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired));
12210 // If we already had an entry, check to see if we are promoting this vtable
12211 // to required a definition. If so, we need to reappend to the VTableUses
12212 // list, since we may have already processed the first entry.
12213 if (DefinitionRequired && !Pos.first->second) {
12214 Pos.first->second = true;
12216 // Otherwise, we can early exit.
12221 // Local classes need to have their virtual members marked
12222 // immediately. For all other classes, we mark their virtual members
12223 // at the end of the translation unit.
12224 if (Class->isLocalClass())
12225 MarkVirtualMembersReferenced(Loc, Class);
12227 VTableUses.push_back(std::make_pair(Class, Loc));
12230 bool Sema::DefineUsedVTables() {
12231 LoadExternalVTableUses();
12232 if (VTableUses.empty())
12235 // Note: The VTableUses vector could grow as a result of marking
12236 // the members of a class as "used", so we check the size each
12237 // time through the loop and prefer indices (which are stable) to
12238 // iterators (which are not).
12239 bool DefinedAnything = false;
12240 for (unsigned I = 0; I != VTableUses.size(); ++I) {
12241 CXXRecordDecl *Class = VTableUses[I].first->getDefinition();
12245 SourceLocation Loc = VTableUses[I].second;
12247 bool DefineVTable = true;
12249 // If this class has a key function, but that key function is
12250 // defined in another translation unit, we don't need to emit the
12251 // vtable even though we're using it.
12252 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class);
12253 if (KeyFunction && !KeyFunction->hasBody()) {
12254 // The key function is in another translation unit.
12255 DefineVTable = false;
12256 TemplateSpecializationKind TSK =
12257 KeyFunction->getTemplateSpecializationKind();
12258 assert(TSK != TSK_ExplicitInstantiationDefinition &&
12259 TSK != TSK_ImplicitInstantiation &&
12260 "Instantiations don't have key functions");
12262 } else if (!KeyFunction) {
12263 // If we have a class with no key function that is the subject
12264 // of an explicit instantiation declaration, suppress the
12265 // vtable; it will live with the explicit instantiation
12267 bool IsExplicitInstantiationDeclaration
12268 = Class->getTemplateSpecializationKind()
12269 == TSK_ExplicitInstantiationDeclaration;
12270 for (TagDecl::redecl_iterator R = Class->redecls_begin(),
12271 REnd = Class->redecls_end();
12273 TemplateSpecializationKind TSK
12274 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind();
12275 if (TSK == TSK_ExplicitInstantiationDeclaration)
12276 IsExplicitInstantiationDeclaration = true;
12277 else if (TSK == TSK_ExplicitInstantiationDefinition) {
12278 IsExplicitInstantiationDeclaration = false;
12283 if (IsExplicitInstantiationDeclaration)
12284 DefineVTable = false;
12287 // The exception specifications for all virtual members may be needed even
12288 // if we are not providing an authoritative form of the vtable in this TU.
12289 // We may choose to emit it available_externally anyway.
12290 if (!DefineVTable) {
12291 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class);
12295 // Mark all of the virtual members of this class as referenced, so
12296 // that we can build a vtable. Then, tell the AST consumer that a
12297 // vtable for this class is required.
12298 DefinedAnything = true;
12299 MarkVirtualMembersReferenced(Loc, Class);
12300 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl());
12301 Consumer.HandleVTable(Class, VTablesUsed[Canonical]);
12303 // Optionally warn if we're emitting a weak vtable.
12304 if (Class->isExternallyVisible() &&
12305 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) {
12306 const FunctionDecl *KeyFunctionDef = 0;
12307 if (!KeyFunction ||
12308 (KeyFunction->hasBody(KeyFunctionDef) &&
12309 KeyFunctionDef->isInlined()))
12310 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() ==
12311 TSK_ExplicitInstantiationDefinition
12312 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable)
12316 VTableUses.clear();
12318 return DefinedAnything;
12321 void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc,
12322 const CXXRecordDecl *RD) {
12323 for (CXXRecordDecl::method_iterator I = RD->method_begin(),
12324 E = RD->method_end(); I != E; ++I)
12325 if ((*I)->isVirtual() && !(*I)->isPure())
12326 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>());
12329 void Sema::MarkVirtualMembersReferenced(SourceLocation Loc,
12330 const CXXRecordDecl *RD) {
12331 // Mark all functions which will appear in RD's vtable as used.
12332 CXXFinalOverriderMap FinalOverriders;
12333 RD->getFinalOverriders(FinalOverriders);
12334 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(),
12335 E = FinalOverriders.end();
12337 for (OverridingMethods::const_iterator OI = I->second.begin(),
12338 OE = I->second.end();
12340 assert(OI->second.size() > 0 && "no final overrider");
12341 CXXMethodDecl *Overrider = OI->second.front().Method;
12343 // C++ [basic.def.odr]p2:
12344 // [...] A virtual member function is used if it is not pure. [...]
12345 if (!Overrider->isPure())
12346 MarkFunctionReferenced(Loc, Overrider);
12350 // Only classes that have virtual bases need a VTT.
12351 if (RD->getNumVBases() == 0)
12354 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(),
12355 e = RD->bases_end(); i != e; ++i) {
12356 const CXXRecordDecl *Base =
12357 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl());
12358 if (Base->getNumVBases() == 0)
12360 MarkVirtualMembersReferenced(Loc, Base);
12364 /// SetIvarInitializers - This routine builds initialization ASTs for the
12365 /// Objective-C implementation whose ivars need be initialized.
12366 void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) {
12367 if (!getLangOpts().CPlusPlus)
12369 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) {
12370 SmallVector<ObjCIvarDecl*, 8> ivars;
12371 CollectIvarsToConstructOrDestruct(OID, ivars);
12374 SmallVector<CXXCtorInitializer*, 32> AllToInit;
12375 for (unsigned i = 0; i < ivars.size(); i++) {
12376 FieldDecl *Field = ivars[i];
12377 if (Field->isInvalidDecl())
12380 CXXCtorInitializer *Member;
12381 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field);
12382 InitializationKind InitKind =
12383 InitializationKind::CreateDefault(ObjCImplementation->getLocation());
12385 InitializationSequence InitSeq(*this, InitEntity, InitKind, None);
12386 ExprResult MemberInit =
12387 InitSeq.Perform(*this, InitEntity, InitKind, None);
12388 MemberInit = MaybeCreateExprWithCleanups(MemberInit);
12389 // Note, MemberInit could actually come back empty if no initialization
12390 // is required (e.g., because it would call a trivial default constructor)
12391 if (!MemberInit.get() || MemberInit.isInvalid())
12395 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(),
12397 MemberInit.takeAs<Expr>(),
12399 AllToInit.push_back(Member);
12401 // Be sure that the destructor is accessible and is marked as referenced.
12402 if (const RecordType *RecordTy
12403 = Context.getBaseElementType(Field->getType())
12404 ->getAs<RecordType>()) {
12405 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl());
12406 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) {
12407 MarkFunctionReferenced(Field->getLocation(), Destructor);
12408 CheckDestructorAccess(Field->getLocation(), Destructor,
12409 PDiag(diag::err_access_dtor_ivar)
12410 << Context.getBaseElementType(Field->getType()));
12414 ObjCImplementation->setIvarInitializers(Context,
12415 AllToInit.data(), AllToInit.size());
12420 void DelegatingCycleHelper(CXXConstructorDecl* Ctor,
12421 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid,
12422 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid,
12423 llvm::SmallSet<CXXConstructorDecl*, 4> &Current,
12425 if (Ctor->isInvalidDecl())
12428 CXXConstructorDecl *Target = Ctor->getTargetConstructor();
12430 // Target may not be determinable yet, for instance if this is a dependent
12431 // call in an uninstantiated template.
12433 const FunctionDecl *FNTarget = 0;
12434 (void)Target->hasBody(FNTarget);
12435 Target = const_cast<CXXConstructorDecl*>(
12436 cast_or_null<CXXConstructorDecl>(FNTarget));
12439 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(),
12440 // Avoid dereferencing a null pointer here.
12441 *TCanonical = Target ? Target->getCanonicalDecl() : 0;
12443 if (!Current.insert(Canonical))
12446 // We know that beyond here, we aren't chaining into a cycle.
12447 if (!Target || !Target->isDelegatingConstructor() ||
12448 Target->isInvalidDecl() || Valid.count(TCanonical)) {
12449 Valid.insert(Current.begin(), Current.end());
12451 // We've hit a cycle.
12452 } else if (TCanonical == Canonical || Invalid.count(TCanonical) ||
12453 Current.count(TCanonical)) {
12454 // If we haven't diagnosed this cycle yet, do so now.
12455 if (!Invalid.count(TCanonical)) {
12456 S.Diag((*Ctor->init_begin())->getSourceLocation(),
12457 diag::warn_delegating_ctor_cycle)
12460 // Don't add a note for a function delegating directly to itself.
12461 if (TCanonical != Canonical)
12462 S.Diag(Target->getLocation(), diag::note_it_delegates_to);
12464 CXXConstructorDecl *C = Target;
12465 while (C->getCanonicalDecl() != Canonical) {
12466 const FunctionDecl *FNTarget = 0;
12467 (void)C->getTargetConstructor()->hasBody(FNTarget);
12468 assert(FNTarget && "Ctor cycle through bodiless function");
12470 C = const_cast<CXXConstructorDecl*>(
12471 cast<CXXConstructorDecl>(FNTarget));
12472 S.Diag(C->getLocation(), diag::note_which_delegates_to);
12476 Invalid.insert(Current.begin(), Current.end());
12479 DelegatingCycleHelper(Target, Valid, Invalid, Current, S);
12484 void Sema::CheckDelegatingCtorCycles() {
12485 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current;
12487 for (DelegatingCtorDeclsType::iterator
12488 I = DelegatingCtorDecls.begin(ExternalSource),
12489 E = DelegatingCtorDecls.end();
12491 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this);
12493 for (llvm::SmallSet<CXXConstructorDecl *, 4>::iterator CI = Invalid.begin(),
12494 CE = Invalid.end();
12496 (*CI)->setInvalidDecl();
12500 /// \brief AST visitor that finds references to the 'this' expression.
12501 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> {
12505 explicit FindCXXThisExpr(Sema &S) : S(S) { }
12507 bool VisitCXXThisExpr(CXXThisExpr *E) {
12508 S.Diag(E->getLocation(), diag::err_this_static_member_func)
12509 << E->isImplicit();
12515 bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) {
12516 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
12520 TypeLoc TL = TSInfo->getTypeLoc();
12521 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>();
12525 // C++11 [expr.prim.general]p3:
12526 // [The expression this] shall not appear before the optional
12527 // cv-qualifier-seq and it shall not appear within the declaration of a
12528 // static member function (although its type and value category are defined
12529 // within a static member function as they are within a non-static member
12530 // function). [ Note: this is because declaration matching does not occur
12531 // until the complete declarator is known. - end note ]
12532 const FunctionProtoType *Proto = ProtoTL.getTypePtr();
12533 FindCXXThisExpr Finder(*this);
12535 // If the return type came after the cv-qualifier-seq, check it now.
12536 if (Proto->hasTrailingReturn() &&
12537 !Finder.TraverseTypeLoc(ProtoTL.getResultLoc()))
12540 // Check the exception specification.
12541 if (checkThisInStaticMemberFunctionExceptionSpec(Method))
12544 return checkThisInStaticMemberFunctionAttributes(Method);
12547 bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) {
12548 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
12552 TypeLoc TL = TSInfo->getTypeLoc();
12553 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>();
12557 const FunctionProtoType *Proto = ProtoTL.getTypePtr();
12558 FindCXXThisExpr Finder(*this);
12560 switch (Proto->getExceptionSpecType()) {
12561 case EST_Uninstantiated:
12562 case EST_Unevaluated:
12563 case EST_BasicNoexcept:
12564 case EST_DynamicNone:
12569 case EST_ComputedNoexcept:
12570 if (!Finder.TraverseStmt(Proto->getNoexceptExpr()))
12574 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(),
12575 EEnd = Proto->exception_end();
12577 if (!Finder.TraverseType(*E))
12586 bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) {
12587 FindCXXThisExpr Finder(*this);
12589 // Check attributes.
12590 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end();
12592 // FIXME: This should be emitted by tblgen.
12594 ArrayRef<Expr *> Args;
12595 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A))
12597 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A))
12599 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A))
12600 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size());
12601 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A))
12602 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size());
12603 else if (ExclusiveLockFunctionAttr *ELF
12604 = dyn_cast<ExclusiveLockFunctionAttr>(*A))
12605 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size());
12606 else if (SharedLockFunctionAttr *SLF
12607 = dyn_cast<SharedLockFunctionAttr>(*A))
12608 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size());
12609 else if (ExclusiveTrylockFunctionAttr *ETLF
12610 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) {
12611 Arg = ETLF->getSuccessValue();
12612 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size());
12613 } else if (SharedTrylockFunctionAttr *STLF
12614 = dyn_cast<SharedTrylockFunctionAttr>(*A)) {
12615 Arg = STLF->getSuccessValue();
12616 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size());
12617 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A))
12618 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size());
12619 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A))
12620 Arg = LR->getArg();
12621 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A))
12622 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size());
12623 else if (ExclusiveLocksRequiredAttr *ELR
12624 = dyn_cast<ExclusiveLocksRequiredAttr>(*A))
12625 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size());
12626 else if (SharedLocksRequiredAttr *SLR
12627 = dyn_cast<SharedLocksRequiredAttr>(*A))
12628 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size());
12630 if (Arg && !Finder.TraverseStmt(Arg))
12633 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
12634 if (!Finder.TraverseStmt(Args[I]))
12643 Sema::checkExceptionSpecification(ExceptionSpecificationType EST,
12644 ArrayRef<ParsedType> DynamicExceptions,
12645 ArrayRef<SourceRange> DynamicExceptionRanges,
12646 Expr *NoexceptExpr,
12647 SmallVectorImpl<QualType> &Exceptions,
12648 FunctionProtoType::ExtProtoInfo &EPI) {
12649 Exceptions.clear();
12650 EPI.ExceptionSpecType = EST;
12651 if (EST == EST_Dynamic) {
12652 Exceptions.reserve(DynamicExceptions.size());
12653 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) {
12654 // FIXME: Preserve type source info.
12655 QualType ET = GetTypeFromParser(DynamicExceptions[ei]);
12657 SmallVector<UnexpandedParameterPack, 2> Unexpanded;
12658 collectUnexpandedParameterPacks(ET, Unexpanded);
12659 if (!Unexpanded.empty()) {
12660 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(),
12661 UPPC_ExceptionType,
12666 // Check that the type is valid for an exception spec, and
12668 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei]))
12669 Exceptions.push_back(ET);
12671 EPI.NumExceptions = Exceptions.size();
12672 EPI.Exceptions = Exceptions.data();
12676 if (EST == EST_ComputedNoexcept) {
12677 // If an error occurred, there's no expression here.
12678 if (NoexceptExpr) {
12679 assert((NoexceptExpr->isTypeDependent() ||
12680 NoexceptExpr->getType()->getCanonicalTypeUnqualified() ==
12682 "Parser should have made sure that the expression is boolean");
12683 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) {
12684 EPI.ExceptionSpecType = EST_BasicNoexcept;
12688 if (!NoexceptExpr->isValueDependent())
12689 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0,
12690 diag::err_noexcept_needs_constant_expression,
12691 /*AllowFold*/ false).take();
12692 EPI.NoexceptExpr = NoexceptExpr;
12698 /// IdentifyCUDATarget - Determine the CUDA compilation target for this function
12699 Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) {
12700 // Implicitly declared functions (e.g. copy constructors) are
12701 // __host__ __device__
12702 if (D->isImplicit())
12703 return CFT_HostDevice;
12705 if (D->hasAttr<CUDAGlobalAttr>())
12708 if (D->hasAttr<CUDADeviceAttr>()) {
12709 if (D->hasAttr<CUDAHostAttr>())
12710 return CFT_HostDevice;
12717 bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget,
12718 CUDAFunctionTarget CalleeTarget) {
12719 // CUDA B.1.1 "The __device__ qualifier declares a function that is...
12720 // Callable from the device only."
12721 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device)
12724 // CUDA B.1.2 "The __global__ qualifier declares a function that is...
12725 // Callable from the host only."
12726 // CUDA B.1.3 "The __host__ qualifier declares a function that is...
12727 // Callable from the host only."
12728 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) &&
12729 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global))
12732 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice)
12738 /// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class.
12740 MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record,
12741 SourceLocation DeclStart,
12742 Declarator &D, Expr *BitWidth,
12743 InClassInitStyle InitStyle,
12744 AccessSpecifier AS,
12745 AttributeList *MSPropertyAttr) {
12746 IdentifierInfo *II = D.getIdentifier();
12748 Diag(DeclStart, diag::err_anonymous_property);
12751 SourceLocation Loc = D.getIdentifierLoc();
12753 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
12754 QualType T = TInfo->getType();
12755 if (getLangOpts().CPlusPlus) {
12756 CheckExtraCXXDefaultArguments(D);
12758 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
12759 UPPC_DataMemberType)) {
12760 D.setInvalidType();
12762 TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
12766 DiagnoseFunctionSpecifiers(D.getDeclSpec());
12768 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec())
12769 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
12770 diag::err_invalid_thread)
12771 << DeclSpec::getSpecifierName(TSCS);
12773 // Check to see if this name was declared as a member previously
12774 NamedDecl *PrevDecl = 0;
12775 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration);
12776 LookupName(Previous, S);
12777 switch (Previous.getResultKind()) {
12778 case LookupResult::Found:
12779 case LookupResult::FoundUnresolvedValue:
12780 PrevDecl = Previous.getAsSingle<NamedDecl>();
12783 case LookupResult::FoundOverloaded:
12784 PrevDecl = Previous.getRepresentativeDecl();
12787 case LookupResult::NotFound:
12788 case LookupResult::NotFoundInCurrentInstantiation:
12789 case LookupResult::Ambiguous:
12793 if (PrevDecl && PrevDecl->isTemplateParameter()) {
12794 // Maybe we will complain about the shadowed template parameter.
12795 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
12796 // Just pretend that we didn't see the previous declaration.
12800 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
12803 SourceLocation TSSL = D.getLocStart();
12804 MSPropertyDecl *NewPD;
12805 const AttributeList::PropertyData &Data = MSPropertyAttr->getPropertyData();
12806 NewPD = new (Context) MSPropertyDecl(Record, Loc,
12807 II, T, TInfo, TSSL,
12808 Data.GetterId, Data.SetterId);
12809 ProcessDeclAttributes(TUScope, NewPD, D);
12810 NewPD->setAccess(AS);
12812 if (NewPD->isInvalidDecl())
12813 Record->setInvalidDecl();
12815 if (D.getDeclSpec().isModulePrivateSpecified())
12816 NewPD->setModulePrivate();
12818 if (NewPD->isInvalidDecl() && PrevDecl) {
12819 // Don't introduce NewFD into scope; there's already something
12820 // with the same name in the same scope.
12822 PushOnScopeChains(NewPD, S);
12824 Record->addDecl(NewPD);