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/Sema/CXXFieldCollector.h"
16 #include "clang/Sema/Scope.h"
17 #include "clang/Sema/Initialization.h"
18 #include "clang/Sema/Lookup.h"
19 #include "clang/Sema/ScopeInfo.h"
20 #include "clang/AST/ASTConsumer.h"
21 #include "clang/AST/ASTContext.h"
22 #include "clang/AST/ASTMutationListener.h"
23 #include "clang/AST/CharUnits.h"
24 #include "clang/AST/CXXInheritance.h"
25 #include "clang/AST/DeclVisitor.h"
26 #include "clang/AST/ExprCXX.h"
27 #include "clang/AST/RecordLayout.h"
28 #include "clang/AST/RecursiveASTVisitor.h"
29 #include "clang/AST/StmtVisitor.h"
30 #include "clang/AST/TypeLoc.h"
31 #include "clang/AST/TypeOrdering.h"
32 #include "clang/Sema/DeclSpec.h"
33 #include "clang/Sema/ParsedTemplate.h"
34 #include "clang/Basic/PartialDiagnostic.h"
35 #include "clang/Lex/Preprocessor.h"
36 #include "llvm/ADT/SmallString.h"
37 #include "llvm/ADT/STLExtras.h"
41 using namespace clang;
43 //===----------------------------------------------------------------------===//
44 // CheckDefaultArgumentVisitor
45 //===----------------------------------------------------------------------===//
48 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses
49 /// the default argument of a parameter to determine whether it
50 /// contains any ill-formed subexpressions. For example, this will
51 /// diagnose the use of local variables or parameters within the
52 /// default argument expression.
53 class CheckDefaultArgumentVisitor
54 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> {
59 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
60 : DefaultArg(defarg), S(s) {}
62 bool VisitExpr(Expr *Node);
63 bool VisitDeclRefExpr(DeclRefExpr *DRE);
64 bool VisitCXXThisExpr(CXXThisExpr *ThisE);
65 bool VisitLambdaExpr(LambdaExpr *Lambda);
68 /// VisitExpr - Visit all of the children of this expression.
69 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) {
70 bool IsInvalid = false;
71 for (Stmt::child_range I = Node->children(); I; ++I)
72 IsInvalid |= Visit(*I);
76 /// VisitDeclRefExpr - Visit a reference to a declaration, to
77 /// determine whether this declaration can be used in the default
78 /// argument expression.
79 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) {
80 NamedDecl *Decl = DRE->getDecl();
81 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) {
82 // C++ [dcl.fct.default]p9
83 // Default arguments are evaluated each time the function is
84 // called. The order of evaluation of function arguments is
85 // unspecified. Consequently, parameters of a function shall not
86 // be used in default argument expressions, even if they are not
87 // evaluated. Parameters of a function declared before a default
88 // argument expression are in scope and can hide namespace and
89 // class member names.
90 return S->Diag(DRE->getLocStart(),
91 diag::err_param_default_argument_references_param)
92 << Param->getDeclName() << DefaultArg->getSourceRange();
93 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) {
94 // C++ [dcl.fct.default]p7
95 // Local variables shall not be used in default argument
97 if (VDecl->isLocalVarDecl())
98 return S->Diag(DRE->getLocStart(),
99 diag::err_param_default_argument_references_local)
100 << VDecl->getDeclName() << DefaultArg->getSourceRange();
106 /// VisitCXXThisExpr - Visit a C++ "this" expression.
107 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) {
108 // C++ [dcl.fct.default]p8:
109 // The keyword this shall not be used in a default argument of a
111 return S->Diag(ThisE->getLocStart(),
112 diag::err_param_default_argument_references_this)
113 << ThisE->getSourceRange();
116 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) {
117 // C++11 [expr.lambda.prim]p13:
118 // A lambda-expression appearing in a default argument shall not
119 // implicitly or explicitly capture any entity.
120 if (Lambda->capture_begin() == Lambda->capture_end())
123 return S->Diag(Lambda->getLocStart(),
124 diag::err_lambda_capture_default_arg);
128 void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc,
129 CXXMethodDecl *Method) {
130 // If we have an MSAny or unknown spec already, don't bother.
131 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed)
134 const FunctionProtoType *Proto
135 = Method->getType()->getAs<FunctionProtoType>();
136 Proto = Self->ResolveExceptionSpec(CallLoc, Proto);
140 ExceptionSpecificationType EST = Proto->getExceptionSpecType();
142 // If this function can throw any exceptions, make a note of that.
143 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) {
149 // FIXME: If the call to this decl is using any of its default arguments, we
150 // need to search them for potentially-throwing calls.
152 // If this function has a basic noexcept, it doesn't affect the outcome.
153 if (EST == EST_BasicNoexcept)
156 // If we have a throw-all spec at this point, ignore the function.
157 if (ComputedEST == EST_None)
160 // If we're still at noexcept(true) and there's a nothrow() callee,
161 // change to that specification.
162 if (EST == EST_DynamicNone) {
163 if (ComputedEST == EST_BasicNoexcept)
164 ComputedEST = EST_DynamicNone;
168 // Check out noexcept specs.
169 if (EST == EST_ComputedNoexcept) {
170 FunctionProtoType::NoexceptResult NR =
171 Proto->getNoexceptSpec(Self->Context);
172 assert(NR != FunctionProtoType::NR_NoNoexcept &&
173 "Must have noexcept result for EST_ComputedNoexcept.");
174 assert(NR != FunctionProtoType::NR_Dependent &&
175 "Should not generate implicit declarations for dependent cases, "
176 "and don't know how to handle them anyway.");
178 // noexcept(false) -> no spec on the new function
179 if (NR == FunctionProtoType::NR_Throw) {
181 ComputedEST = EST_None;
183 // noexcept(true) won't change anything either.
187 assert(EST == EST_Dynamic && "EST case not considered earlier.");
188 assert(ComputedEST != EST_None &&
189 "Shouldn't collect exceptions when throw-all is guaranteed.");
190 ComputedEST = EST_Dynamic;
191 // Record the exceptions in this function's exception specification.
192 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(),
193 EEnd = Proto->exception_end();
195 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E)))
196 Exceptions.push_back(*E);
199 void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) {
200 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed)
205 // C++0x [except.spec]p14:
206 // [An] implicit exception-specification specifies the type-id T if and
207 // only if T is allowed by the exception-specification of a function directly
208 // invoked by f's implicit definition; f shall allow all exceptions if any
209 // function it directly invokes allows all exceptions, and f shall allow no
210 // exceptions if every function it directly invokes allows no exceptions.
212 // Note in particular that if an implicit exception-specification is generated
213 // for a function containing a throw-expression, that specification can still
214 // be noexcept(true).
216 // Note also that 'directly invoked' is not defined in the standard, and there
217 // is no indication that we should only consider potentially-evaluated calls.
219 // Ultimately we should implement the intent of the standard: the exception
220 // specification should be the set of exceptions which can be thrown by the
221 // implicit definition. For now, we assume that any non-nothrow expression can
222 // throw any exception.
224 if (Self->canThrow(E))
225 ComputedEST = EST_None;
229 Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg,
230 SourceLocation EqualLoc) {
231 if (RequireCompleteType(Param->getLocation(), Param->getType(),
232 diag::err_typecheck_decl_incomplete_type)) {
233 Param->setInvalidDecl();
237 // C++ [dcl.fct.default]p5
238 // A default argument expression is implicitly converted (clause
239 // 4) to the parameter type. The default argument expression has
240 // the same semantic constraints as the initializer expression in
241 // a declaration of a variable of the parameter type, using the
242 // copy-initialization semantics (8.5).
243 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
245 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(),
247 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1);
248 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
249 MultiExprArg(*this, &Arg, 1));
250 if (Result.isInvalid())
252 Arg = Result.takeAs<Expr>();
254 CheckImplicitConversions(Arg, EqualLoc);
255 Arg = MaybeCreateExprWithCleanups(Arg);
257 // Okay: add the default argument to the parameter
258 Param->setDefaultArg(Arg);
260 // We have already instantiated this parameter; provide each of the
261 // instantiations with the uninstantiated default argument.
262 UnparsedDefaultArgInstantiationsMap::iterator InstPos
263 = UnparsedDefaultArgInstantiations.find(Param);
264 if (InstPos != UnparsedDefaultArgInstantiations.end()) {
265 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I)
266 InstPos->second[I]->setUninstantiatedDefaultArg(Arg);
268 // We're done tracking this parameter's instantiations.
269 UnparsedDefaultArgInstantiations.erase(InstPos);
275 /// ActOnParamDefaultArgument - Check whether the default argument
276 /// provided for a function parameter is well-formed. If so, attach it
277 /// to the parameter declaration.
279 Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc,
281 if (!param || !DefaultArg)
284 ParmVarDecl *Param = cast<ParmVarDecl>(param);
285 UnparsedDefaultArgLocs.erase(Param);
287 // Default arguments are only permitted in C++
288 if (!getLangOpts().CPlusPlus) {
289 Diag(EqualLoc, diag::err_param_default_argument)
290 << DefaultArg->getSourceRange();
291 Param->setInvalidDecl();
295 // Check for unexpanded parameter packs.
296 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) {
297 Param->setInvalidDecl();
301 // Check that the default argument is well-formed
302 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this);
303 if (DefaultArgChecker.Visit(DefaultArg)) {
304 Param->setInvalidDecl();
308 SetParamDefaultArgument(Param, DefaultArg, EqualLoc);
311 /// ActOnParamUnparsedDefaultArgument - We've seen a default
312 /// argument for a function parameter, but we can't parse it yet
313 /// because we're inside a class definition. Note that this default
314 /// argument will be parsed later.
315 void Sema::ActOnParamUnparsedDefaultArgument(Decl *param,
316 SourceLocation EqualLoc,
317 SourceLocation ArgLoc) {
321 ParmVarDecl *Param = cast<ParmVarDecl>(param);
323 Param->setUnparsedDefaultArg();
325 UnparsedDefaultArgLocs[Param] = ArgLoc;
328 /// ActOnParamDefaultArgumentError - Parsing or semantic analysis of
329 /// the default argument for the parameter param failed.
330 void Sema::ActOnParamDefaultArgumentError(Decl *param) {
334 ParmVarDecl *Param = cast<ParmVarDecl>(param);
336 Param->setInvalidDecl();
338 UnparsedDefaultArgLocs.erase(Param);
341 /// CheckExtraCXXDefaultArguments - Check for any extra default
342 /// arguments in the declarator, which is not a function declaration
343 /// or definition and therefore is not permitted to have default
344 /// arguments. This routine should be invoked for every declarator
345 /// that is not a function declaration or definition.
346 void Sema::CheckExtraCXXDefaultArguments(Declarator &D) {
347 // C++ [dcl.fct.default]p3
348 // A default argument expression shall be specified only in the
349 // parameter-declaration-clause of a function declaration or in a
350 // template-parameter (14.1). It shall not be specified for a
351 // parameter pack. If it is specified in a
352 // parameter-declaration-clause, it shall not occur within a
353 // declarator or abstract-declarator of a parameter-declaration.
354 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
355 DeclaratorChunk &chunk = D.getTypeObject(i);
356 if (chunk.Kind == DeclaratorChunk::Function) {
357 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) {
359 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param);
360 if (Param->hasUnparsedDefaultArg()) {
361 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens;
362 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
363 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation());
365 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0;
366 } else if (Param->getDefaultArg()) {
367 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
368 << Param->getDefaultArg()->getSourceRange();
369 Param->setDefaultArg(0);
376 // MergeCXXFunctionDecl - Merge two declarations of the same C++
377 // function, once we already know that they have the same
378 // type. Subroutine of MergeFunctionDecl. Returns true if there was an
379 // error, false otherwise.
380 bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old,
382 bool Invalid = false;
384 // C++ [dcl.fct.default]p4:
385 // For non-template functions, default arguments can be added in
386 // later declarations of a function in the same
387 // scope. Declarations in different scopes have completely
388 // distinct sets of default arguments. That is, declarations in
389 // inner scopes do not acquire default arguments from
390 // declarations in outer scopes, and vice versa. In a given
391 // function declaration, all parameters subsequent to a
392 // parameter with a default argument shall have default
393 // arguments supplied in this or previous declarations. A
394 // default argument shall not be redefined by a later
395 // declaration (not even to the same value).
397 // C++ [dcl.fct.default]p6:
398 // Except for member functions of class templates, the default arguments
399 // in a member function definition that appears outside of the class
400 // definition are added to the set of default arguments provided by the
401 // member function declaration in the class definition.
402 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) {
403 ParmVarDecl *OldParam = Old->getParamDecl(p);
404 ParmVarDecl *NewParam = New->getParamDecl(p);
406 bool OldParamHasDfl = OldParam->hasDefaultArg();
407 bool NewParamHasDfl = NewParam->hasDefaultArg();
410 if (S && !isDeclInScope(ND, New->getDeclContext(), S))
411 // Ignore default parameters of old decl if they are not in
413 OldParamHasDfl = false;
415 if (OldParamHasDfl && NewParamHasDfl) {
417 unsigned DiagDefaultParamID =
418 diag::err_param_default_argument_redefinition;
420 // MSVC accepts that default parameters be redefined for member functions
421 // of template class. The new default parameter's value is ignored.
423 if (getLangOpts().MicrosoftExt) {
424 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New);
425 if (MD && MD->getParent()->getDescribedClassTemplate()) {
426 // Merge the old default argument into the new parameter.
427 NewParam->setHasInheritedDefaultArg();
428 if (OldParam->hasUninstantiatedDefaultArg())
429 NewParam->setUninstantiatedDefaultArg(
430 OldParam->getUninstantiatedDefaultArg());
432 NewParam->setDefaultArg(OldParam->getInit());
433 DiagDefaultParamID = diag::warn_param_default_argument_redefinition;
438 // FIXME: If we knew where the '=' was, we could easily provide a fix-it
439 // hint here. Alternatively, we could walk the type-source information
440 // for NewParam to find the last source location in the type... but it
441 // isn't worth the effort right now. This is the kind of test case that
442 // is hard to get right:
444 // void g(int (*fp)(int) = f);
445 // void g(int (*fp)(int) = &f);
446 Diag(NewParam->getLocation(), DiagDefaultParamID)
447 << NewParam->getDefaultArgRange();
449 // Look for the function declaration where the default argument was
450 // actually written, which may be a declaration prior to Old.
451 for (FunctionDecl *Older = Old->getPreviousDecl();
452 Older; Older = Older->getPreviousDecl()) {
453 if (!Older->getParamDecl(p)->hasDefaultArg())
456 OldParam = Older->getParamDecl(p);
459 Diag(OldParam->getLocation(), diag::note_previous_definition)
460 << OldParam->getDefaultArgRange();
461 } else if (OldParamHasDfl) {
462 // Merge the old default argument into the new parameter.
463 // It's important to use getInit() here; getDefaultArg()
464 // strips off any top-level ExprWithCleanups.
465 NewParam->setHasInheritedDefaultArg();
466 if (OldParam->hasUninstantiatedDefaultArg())
467 NewParam->setUninstantiatedDefaultArg(
468 OldParam->getUninstantiatedDefaultArg());
470 NewParam->setDefaultArg(OldParam->getInit());
471 } else if (NewParamHasDfl) {
472 if (New->getDescribedFunctionTemplate()) {
473 // Paragraph 4, quoted above, only applies to non-template functions.
474 Diag(NewParam->getLocation(),
475 diag::err_param_default_argument_template_redecl)
476 << NewParam->getDefaultArgRange();
477 Diag(Old->getLocation(), diag::note_template_prev_declaration)
479 } else if (New->getTemplateSpecializationKind()
480 != TSK_ImplicitInstantiation &&
481 New->getTemplateSpecializationKind() != TSK_Undeclared) {
482 // C++ [temp.expr.spec]p21:
483 // Default function arguments shall not be specified in a declaration
484 // or a definition for one of the following explicit specializations:
485 // - the explicit specialization of a function template;
486 // - the explicit specialization of a member function template;
487 // - the explicit specialization of a member function of a class
488 // template where the class template specialization to which the
489 // member function specialization belongs is implicitly
491 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg)
492 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization)
493 << New->getDeclName()
494 << NewParam->getDefaultArgRange();
495 } else if (New->getDeclContext()->isDependentContext()) {
496 // C++ [dcl.fct.default]p6 (DR217):
497 // Default arguments for a member function of a class template shall
498 // be specified on the initial declaration of the member function
499 // within the class template.
501 // Reading the tea leaves a bit in DR217 and its reference to DR205
502 // leads me to the conclusion that one cannot add default function
503 // arguments for an out-of-line definition of a member function of a
506 if (CXXRecordDecl *Record
507 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) {
508 if (Record->getDescribedClassTemplate())
510 else if (isa<ClassTemplatePartialSpecializationDecl>(Record))
516 Diag(NewParam->getLocation(),
517 diag::err_param_default_argument_member_template_redecl)
519 << NewParam->getDefaultArgRange();
520 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) {
521 CXXSpecialMember NewSM = getSpecialMember(Ctor),
522 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old));
523 if (NewSM != OldSM) {
524 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special)
525 << NewParam->getDefaultArgRange() << NewSM;
526 Diag(Old->getLocation(), diag::note_previous_declaration_special)
533 // C++11 [dcl.constexpr]p1: If any declaration of a function or function
534 // template has a constexpr specifier then all its declarations shall
535 // contain the constexpr specifier.
536 if (New->isConstexpr() != Old->isConstexpr()) {
537 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch)
538 << New << New->isConstexpr();
539 Diag(Old->getLocation(), diag::note_previous_declaration);
543 if (CheckEquivalentExceptionSpec(Old, New))
549 /// \brief Merge the exception specifications of two variable declarations.
551 /// This is called when there's a redeclaration of a VarDecl. The function
552 /// checks if the redeclaration might have an exception specification and
553 /// validates compatibility and merges the specs if necessary.
554 void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) {
555 // Shortcut if exceptions are disabled.
556 if (!getLangOpts().CXXExceptions)
559 assert(Context.hasSameType(New->getType(), Old->getType()) &&
560 "Should only be called if types are otherwise the same.");
562 QualType NewType = New->getType();
563 QualType OldType = Old->getType();
565 // We're only interested in pointers and references to functions, as well
566 // as pointers to member functions.
567 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) {
568 NewType = R->getPointeeType();
569 OldType = OldType->getAs<ReferenceType>()->getPointeeType();
570 } else if (const PointerType *P = NewType->getAs<PointerType>()) {
571 NewType = P->getPointeeType();
572 OldType = OldType->getAs<PointerType>()->getPointeeType();
573 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) {
574 NewType = M->getPointeeType();
575 OldType = OldType->getAs<MemberPointerType>()->getPointeeType();
578 if (!NewType->isFunctionProtoType())
581 // There's lots of special cases for functions. For function pointers, system
582 // libraries are hopefully not as broken so that we don't need these
584 if (CheckEquivalentExceptionSpec(
585 OldType->getAs<FunctionProtoType>(), Old->getLocation(),
586 NewType->getAs<FunctionProtoType>(), New->getLocation())) {
587 New->setInvalidDecl();
591 /// CheckCXXDefaultArguments - Verify that the default arguments for a
592 /// function declaration are well-formed according to C++
593 /// [dcl.fct.default].
594 void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) {
595 unsigned NumParams = FD->getNumParams();
598 bool IsLambda = FD->getOverloadedOperator() == OO_Call &&
599 isa<CXXMethodDecl>(FD) &&
600 cast<CXXMethodDecl>(FD)->getParent()->isLambda();
602 // Find first parameter with a default argument
603 for (p = 0; p < NumParams; ++p) {
604 ParmVarDecl *Param = FD->getParamDecl(p);
605 if (Param->hasDefaultArg()) {
606 // C++11 [expr.prim.lambda]p5:
607 // [...] Default arguments (8.3.6) shall not be specified in the
608 // parameter-declaration-clause of a lambda-declarator.
610 // FIXME: Core issue 974 strikes this sentence, we only provide an
611 // extension warning.
613 Diag(Param->getLocation(), diag::ext_lambda_default_arguments)
614 << Param->getDefaultArgRange();
619 // C++ [dcl.fct.default]p4:
620 // In a given function declaration, all parameters
621 // subsequent to a parameter with a default argument shall
622 // have default arguments supplied in this or previous
623 // declarations. A default argument shall not be redefined
624 // by a later declaration (not even to the same value).
625 unsigned LastMissingDefaultArg = 0;
626 for (; p < NumParams; ++p) {
627 ParmVarDecl *Param = FD->getParamDecl(p);
628 if (!Param->hasDefaultArg()) {
629 if (Param->isInvalidDecl())
630 /* We already complained about this parameter. */;
631 else if (Param->getIdentifier())
632 Diag(Param->getLocation(),
633 diag::err_param_default_argument_missing_name)
634 << Param->getIdentifier();
636 Diag(Param->getLocation(),
637 diag::err_param_default_argument_missing);
639 LastMissingDefaultArg = p;
643 if (LastMissingDefaultArg > 0) {
644 // Some default arguments were missing. Clear out all of the
645 // default arguments up to (and including) the last missing
646 // default argument, so that we leave the function parameters
647 // in a semantically valid state.
648 for (p = 0; p <= LastMissingDefaultArg; ++p) {
649 ParmVarDecl *Param = FD->getParamDecl(p);
650 if (Param->hasDefaultArg()) {
651 Param->setDefaultArg(0);
657 // CheckConstexprParameterTypes - Check whether a function's parameter types
658 // are all literal types. If so, return true. If not, produce a suitable
659 // diagnostic and return false.
660 static bool CheckConstexprParameterTypes(Sema &SemaRef,
661 const FunctionDecl *FD) {
662 unsigned ArgIndex = 0;
663 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>();
664 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(),
665 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) {
666 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex);
667 SourceLocation ParamLoc = PD->getLocation();
668 if (!(*i)->isDependentType() &&
669 SemaRef.RequireLiteralType(ParamLoc, *i,
670 SemaRef.PDiag(diag::err_constexpr_non_literal_param)
671 << ArgIndex+1 << PD->getSourceRange()
672 << isa<CXXConstructorDecl>(FD)))
678 // CheckConstexprFunctionDecl - Check whether a function declaration satisfies
679 // the requirements of a constexpr function definition or a constexpr
680 // constructor definition. If so, return true. If not, produce appropriate
681 // diagnostics and return false.
683 // This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360.
684 bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) {
685 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
686 if (MD && MD->isInstance()) {
687 // C++11 [dcl.constexpr]p4:
688 // The definition of a constexpr constructor shall satisfy the following
690 // - the class shall not have any virtual base classes;
691 const CXXRecordDecl *RD = MD->getParent();
692 if (RD->getNumVBases()) {
693 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base)
694 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct()
695 << RD->getNumVBases();
696 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(),
697 E = RD->vbases_end(); I != E; ++I)
698 Diag(I->getLocStart(),
699 diag::note_constexpr_virtual_base_here) << I->getSourceRange();
704 if (!isa<CXXConstructorDecl>(NewFD)) {
705 // C++11 [dcl.constexpr]p3:
706 // The definition of a constexpr function shall satisfy the following
708 // - it shall not be virtual;
709 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD);
710 if (Method && Method->isVirtual()) {
711 Diag(NewFD->getLocation(), diag::err_constexpr_virtual);
713 // If it's not obvious why this function is virtual, find an overridden
714 // function which uses the 'virtual' keyword.
715 const CXXMethodDecl *WrittenVirtual = Method;
716 while (!WrittenVirtual->isVirtualAsWritten())
717 WrittenVirtual = *WrittenVirtual->begin_overridden_methods();
718 if (WrittenVirtual != Method)
719 Diag(WrittenVirtual->getLocation(),
720 diag::note_overridden_virtual_function);
724 // - its return type shall be a literal type;
725 QualType RT = NewFD->getResultType();
726 if (!RT->isDependentType() &&
727 RequireLiteralType(NewFD->getLocation(), RT,
728 PDiag(diag::err_constexpr_non_literal_return)))
732 // - each of its parameter types shall be a literal type;
733 if (!CheckConstexprParameterTypes(*this, NewFD))
739 /// Check the given declaration statement is legal within a constexpr function
740 /// body. C++0x [dcl.constexpr]p3,p4.
742 /// \return true if the body is OK, false if we have diagnosed a problem.
743 static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl,
745 // C++0x [dcl.constexpr]p3 and p4:
746 // The definition of a constexpr function(p3) or constructor(p4) [...] shall
748 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(),
749 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) {
750 switch ((*DclIt)->getKind()) {
751 case Decl::StaticAssert:
753 case Decl::UsingShadow:
754 case Decl::UsingDirective:
755 case Decl::UnresolvedUsingTypename:
756 // - static_assert-declarations
757 // - using-declarations,
758 // - using-directives,
762 case Decl::TypeAlias: {
763 // - typedef declarations and alias-declarations that do not define
764 // classes or enumerations,
765 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt);
766 if (TN->getUnderlyingType()->isVariablyModifiedType()) {
767 // Don't allow variably-modified types in constexpr functions.
768 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc();
769 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla)
770 << TL.getSourceRange() << TL.getType()
771 << isa<CXXConstructorDecl>(Dcl);
778 case Decl::CXXRecord:
779 // As an extension, we allow the declaration (but not the definition) of
780 // classes and enumerations in all declarations, not just in typedef and
781 // alias declarations.
782 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) {
783 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition)
784 << isa<CXXConstructorDecl>(Dcl);
790 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration)
791 << isa<CXXConstructorDecl>(Dcl);
795 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt)
796 << isa<CXXConstructorDecl>(Dcl);
804 /// Check that the given field is initialized within a constexpr constructor.
806 /// \param Dcl The constexpr constructor being checked.
807 /// \param Field The field being checked. This may be a member of an anonymous
808 /// struct or union nested within the class being checked.
809 /// \param Inits All declarations, including anonymous struct/union members and
810 /// indirect members, for which any initialization was provided.
811 /// \param Diagnosed Set to true if an error is produced.
812 static void CheckConstexprCtorInitializer(Sema &SemaRef,
813 const FunctionDecl *Dcl,
815 llvm::SmallSet<Decl*, 16> &Inits,
817 if (Field->isUnnamedBitfield())
820 if (Field->isAnonymousStructOrUnion() &&
821 Field->getType()->getAsCXXRecordDecl()->isEmpty())
824 if (!Inits.count(Field)) {
826 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init);
829 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init);
830 } else if (Field->isAnonymousStructOrUnion()) {
831 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl();
832 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end();
834 // If an anonymous union contains an anonymous struct of which any member
835 // is initialized, all members must be initialized.
836 if (!RD->isUnion() || Inits.count(*I))
837 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed);
841 /// Check the body for the given constexpr function declaration only contains
842 /// the permitted types of statement. C++11 [dcl.constexpr]p3,p4.
844 /// \return true if the body is OK, false if we have diagnosed a problem.
845 bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) {
846 if (isa<CXXTryStmt>(Body)) {
847 // C++11 [dcl.constexpr]p3:
848 // The definition of a constexpr function shall satisfy the following
849 // constraints: [...]
850 // - its function-body shall be = delete, = default, or a
851 // compound-statement
853 // C++11 [dcl.constexpr]p4:
854 // In the definition of a constexpr constructor, [...]
855 // - its function-body shall not be a function-try-block;
856 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block)
857 << isa<CXXConstructorDecl>(Dcl);
861 // - its function-body shall be [...] a compound-statement that contains only
862 CompoundStmt *CompBody = cast<CompoundStmt>(Body);
864 llvm::SmallVector<SourceLocation, 4> ReturnStmts;
865 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(),
866 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) {
867 switch ((*BodyIt)->getStmtClass()) {
868 case Stmt::NullStmtClass:
869 // - null statements,
872 case Stmt::DeclStmtClass:
873 // - static_assert-declarations
874 // - using-declarations,
875 // - using-directives,
876 // - typedef declarations and alias-declarations that do not define
877 // classes or enumerations,
878 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt)))
882 case Stmt::ReturnStmtClass:
883 // - and exactly one return statement;
884 if (isa<CXXConstructorDecl>(Dcl))
887 ReturnStmts.push_back((*BodyIt)->getLocStart());
894 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt)
895 << isa<CXXConstructorDecl>(Dcl);
899 if (const CXXConstructorDecl *Constructor
900 = dyn_cast<CXXConstructorDecl>(Dcl)) {
901 const CXXRecordDecl *RD = Constructor->getParent();
903 // - every non-variant non-static data member and base class sub-object
904 // shall be initialized;
905 // - if the class is a non-empty union, or for each non-empty anonymous
906 // union member of a non-union class, exactly one non-static data member
907 // shall be initialized;
909 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) {
910 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init);
913 } else if (!Constructor->isDependentContext() &&
914 !Constructor->isDelegatingConstructor()) {
915 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases");
917 // Skip detailed checking if we have enough initializers, and we would
918 // allow at most one initializer per member.
919 bool AnyAnonStructUnionMembers = false;
921 for (CXXRecordDecl::field_iterator I = RD->field_begin(),
922 E = RD->field_end(); I != E; ++I, ++Fields) {
923 if ((*I)->isAnonymousStructOrUnion()) {
924 AnyAnonStructUnionMembers = true;
928 if (AnyAnonStructUnionMembers ||
929 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) {
930 // Check initialization of non-static data members. Base classes are
931 // always initialized so do not need to be checked. Dependent bases
932 // might not have initializers in the member initializer list.
933 llvm::SmallSet<Decl*, 16> Inits;
934 for (CXXConstructorDecl::init_const_iterator
935 I = Constructor->init_begin(), E = Constructor->init_end();
937 if (FieldDecl *FD = (*I)->getMember())
939 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember())
940 Inits.insert(ID->chain_begin(), ID->chain_end());
943 bool Diagnosed = false;
944 for (CXXRecordDecl::field_iterator I = RD->field_begin(),
945 E = RD->field_end(); I != E; ++I)
946 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed);
952 if (ReturnStmts.empty()) {
953 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return);
956 if (ReturnStmts.size() > 1) {
957 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return);
958 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I)
959 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return);
964 // C++11 [dcl.constexpr]p5:
965 // if no function argument values exist such that the function invocation
966 // substitution would produce a constant expression, the program is
967 // ill-formed; no diagnostic required.
968 // C++11 [dcl.constexpr]p3:
969 // - every constructor call and implicit conversion used in initializing the
970 // return value shall be one of those allowed in a constant expression.
971 // C++11 [dcl.constexpr]p4:
972 // - every constructor involved in initializing non-static data members and
973 // base class sub-objects shall be a constexpr constructor.
974 llvm::SmallVector<PartialDiagnosticAt, 8> Diags;
975 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) {
976 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr)
977 << isa<CXXConstructorDecl>(Dcl);
978 for (size_t I = 0, N = Diags.size(); I != N; ++I)
979 Diag(Diags[I].first, Diags[I].second);
986 /// isCurrentClassName - Determine whether the identifier II is the
987 /// name of the class type currently being defined. In the case of
988 /// nested classes, this will only return true if II is the name of
989 /// the innermost class.
990 bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *,
991 const CXXScopeSpec *SS) {
992 assert(getLangOpts().CPlusPlus && "No class names in C!");
994 CXXRecordDecl *CurDecl;
995 if (SS && SS->isSet() && !SS->isInvalid()) {
996 DeclContext *DC = computeDeclContext(*SS, true);
997 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
999 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
1001 if (CurDecl && CurDecl->getIdentifier())
1002 return &II == CurDecl->getIdentifier();
1007 /// \brief Check the validity of a C++ base class specifier.
1009 /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics
1010 /// and returns NULL otherwise.
1012 Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
1013 SourceRange SpecifierRange,
1014 bool Virtual, AccessSpecifier Access,
1015 TypeSourceInfo *TInfo,
1016 SourceLocation EllipsisLoc) {
1017 QualType BaseType = TInfo->getType();
1019 // C++ [class.union]p1:
1020 // A union shall not have base classes.
1021 if (Class->isUnion()) {
1022 Diag(Class->getLocation(), diag::err_base_clause_on_union)
1027 if (EllipsisLoc.isValid() &&
1028 !TInfo->getType()->containsUnexpandedParameterPack()) {
1029 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
1030 << TInfo->getTypeLoc().getSourceRange();
1031 EllipsisLoc = SourceLocation();
1034 if (BaseType->isDependentType())
1035 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
1036 Class->getTagKind() == TTK_Class,
1037 Access, TInfo, EllipsisLoc);
1039 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc();
1041 // Base specifiers must be record types.
1042 if (!BaseType->isRecordType()) {
1043 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange;
1047 // C++ [class.union]p1:
1048 // A union shall not be used as a base class.
1049 if (BaseType->isUnionType()) {
1050 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange;
1054 // C++ [class.derived]p2:
1055 // The class-name in a base-specifier shall not be an incompletely
1057 if (RequireCompleteType(BaseLoc, BaseType,
1058 PDiag(diag::err_incomplete_base_class)
1059 << SpecifierRange)) {
1060 Class->setInvalidDecl();
1064 // If the base class is polymorphic or isn't empty, the new one is/isn't, too.
1065 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl();
1066 assert(BaseDecl && "Record type has no declaration");
1067 BaseDecl = BaseDecl->getDefinition();
1068 assert(BaseDecl && "Base type is not incomplete, but has no definition");
1069 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl);
1070 assert(CXXBaseDecl && "Base type is not a C++ type");
1073 // If a class is marked final and it appears as a base-type-specifier in
1074 // base-clause, the program is ill-formed.
1075 if (CXXBaseDecl->hasAttr<FinalAttr>()) {
1076 Diag(BaseLoc, diag::err_class_marked_final_used_as_base)
1077 << CXXBaseDecl->getDeclName();
1078 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl)
1079 << CXXBaseDecl->getDeclName();
1083 if (BaseDecl->isInvalidDecl())
1084 Class->setInvalidDecl();
1086 // Create the base specifier.
1087 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
1088 Class->getTagKind() == TTK_Class,
1089 Access, TInfo, EllipsisLoc);
1092 /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
1093 /// one entry in the base class list of a class specifier, for
1095 /// class foo : public bar, virtual private baz {
1096 /// 'public bar' and 'virtual private baz' are each base-specifiers.
1098 Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange,
1099 bool Virtual, AccessSpecifier Access,
1100 ParsedType basetype, SourceLocation BaseLoc,
1101 SourceLocation EllipsisLoc) {
1105 AdjustDeclIfTemplate(classdecl);
1106 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl);
1110 TypeSourceInfo *TInfo = 0;
1111 GetTypeFromParser(basetype, &TInfo);
1113 if (EllipsisLoc.isInvalid() &&
1114 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo,
1118 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange,
1119 Virtual, Access, TInfo,
1126 /// \brief Performs the actual work of attaching the given base class
1127 /// specifiers to a C++ class.
1128 bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases,
1129 unsigned NumBases) {
1133 // Used to keep track of which base types we have already seen, so
1134 // that we can properly diagnose redundant direct base types. Note
1135 // that the key is always the unqualified canonical type of the base
1137 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes;
1139 // Copy non-redundant base specifiers into permanent storage.
1140 unsigned NumGoodBases = 0;
1141 bool Invalid = false;
1142 for (unsigned idx = 0; idx < NumBases; ++idx) {
1143 QualType NewBaseType
1144 = Context.getCanonicalType(Bases[idx]->getType());
1145 NewBaseType = NewBaseType.getLocalUnqualifiedType();
1147 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType];
1149 // C++ [class.mi]p3:
1150 // A class shall not be specified as a direct base class of a
1151 // derived class more than once.
1152 Diag(Bases[idx]->getLocStart(),
1153 diag::err_duplicate_base_class)
1154 << KnownBase->getType()
1155 << Bases[idx]->getSourceRange();
1157 // Delete the duplicate base class specifier; we're going to
1158 // overwrite its pointer later.
1159 Context.Deallocate(Bases[idx]);
1163 // Okay, add this new base class.
1164 KnownBase = Bases[idx];
1165 Bases[NumGoodBases++] = Bases[idx];
1166 if (const RecordType *Record = NewBaseType->getAs<RecordType>())
1167 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()))
1168 if (RD->hasAttr<WeakAttr>())
1169 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context));
1173 // Attach the remaining base class specifiers to the derived class.
1174 Class->setBases(Bases, NumGoodBases);
1176 // Delete the remaining (good) base class specifiers, since their
1177 // data has been copied into the CXXRecordDecl.
1178 for (unsigned idx = 0; idx < NumGoodBases; ++idx)
1179 Context.Deallocate(Bases[idx]);
1184 /// ActOnBaseSpecifiers - Attach the given base specifiers to the
1185 /// class, after checking whether there are any duplicate base
1187 void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases,
1188 unsigned NumBases) {
1189 if (!ClassDecl || !Bases || !NumBases)
1192 AdjustDeclIfTemplate(ClassDecl);
1193 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl),
1194 (CXXBaseSpecifier**)(Bases), NumBases);
1197 static CXXRecordDecl *GetClassForType(QualType T) {
1198 if (const RecordType *RT = T->getAs<RecordType>())
1199 return cast<CXXRecordDecl>(RT->getDecl());
1200 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>())
1201 return ICT->getDecl();
1206 /// \brief Determine whether the type \p Derived is a C++ class that is
1207 /// derived from the type \p Base.
1208 bool Sema::IsDerivedFrom(QualType Derived, QualType Base) {
1209 if (!getLangOpts().CPlusPlus)
1212 CXXRecordDecl *DerivedRD = GetClassForType(Derived);
1216 CXXRecordDecl *BaseRD = GetClassForType(Base);
1220 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this.
1221 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD);
1224 /// \brief Determine whether the type \p Derived is a C++ class that is
1225 /// derived from the type \p Base.
1226 bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) {
1227 if (!getLangOpts().CPlusPlus)
1230 CXXRecordDecl *DerivedRD = GetClassForType(Derived);
1234 CXXRecordDecl *BaseRD = GetClassForType(Base);
1238 return DerivedRD->isDerivedFrom(BaseRD, Paths);
1241 void Sema::BuildBasePathArray(const CXXBasePaths &Paths,
1242 CXXCastPath &BasePathArray) {
1243 assert(BasePathArray.empty() && "Base path array must be empty!");
1244 assert(Paths.isRecordingPaths() && "Must record paths!");
1246 const CXXBasePath &Path = Paths.front();
1248 // We first go backward and check if we have a virtual base.
1249 // FIXME: It would be better if CXXBasePath had the base specifier for
1250 // the nearest virtual base.
1252 for (unsigned I = Path.size(); I != 0; --I) {
1253 if (Path[I - 1].Base->isVirtual()) {
1259 // Now add all bases.
1260 for (unsigned I = Start, E = Path.size(); I != E; ++I)
1261 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base));
1264 /// \brief Determine whether the given base path includes a virtual
1266 bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) {
1267 for (CXXCastPath::const_iterator B = BasePath.begin(),
1268 BEnd = BasePath.end();
1270 if ((*B)->isVirtual())
1276 /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base
1277 /// conversion (where Derived and Base are class types) is
1278 /// well-formed, meaning that the conversion is unambiguous (and
1279 /// that all of the base classes are accessible). Returns true
1280 /// and emits a diagnostic if the code is ill-formed, returns false
1281 /// otherwise. Loc is the location where this routine should point to
1282 /// if there is an error, and Range is the source range to highlight
1283 /// if there is an error.
1285 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
1286 unsigned InaccessibleBaseID,
1287 unsigned AmbigiousBaseConvID,
1288 SourceLocation Loc, SourceRange Range,
1289 DeclarationName Name,
1290 CXXCastPath *BasePath) {
1291 // First, determine whether the path from Derived to Base is
1292 // ambiguous. This is slightly more expensive than checking whether
1293 // the Derived to Base conversion exists, because here we need to
1294 // explore multiple paths to determine if there is an ambiguity.
1295 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1296 /*DetectVirtual=*/false);
1297 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths);
1298 assert(DerivationOkay &&
1299 "Can only be used with a derived-to-base conversion");
1300 (void)DerivationOkay;
1302 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) {
1303 if (InaccessibleBaseID) {
1304 // Check that the base class can be accessed.
1305 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(),
1306 InaccessibleBaseID)) {
1307 case AR_inaccessible:
1316 // Build a base path if necessary.
1318 BuildBasePathArray(Paths, *BasePath);
1322 // We know that the derived-to-base conversion is ambiguous, and
1323 // we're going to produce a diagnostic. Perform the derived-to-base
1324 // search just one more time to compute all of the possible paths so
1325 // that we can print them out. This is more expensive than any of
1326 // the previous derived-to-base checks we've done, but at this point
1327 // performance isn't as much of an issue.
1329 Paths.setRecordingPaths(true);
1330 bool StillOkay = IsDerivedFrom(Derived, Base, Paths);
1331 assert(StillOkay && "Can only be used with a derived-to-base conversion");
1334 // Build up a textual representation of the ambiguous paths, e.g.,
1335 // D -> B -> A, that will be used to illustrate the ambiguous
1336 // conversions in the diagnostic. We only print one of the paths
1337 // to each base class subobject.
1338 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths);
1340 Diag(Loc, AmbigiousBaseConvID)
1341 << Derived << Base << PathDisplayStr << Range << Name;
1346 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
1347 SourceLocation Loc, SourceRange Range,
1348 CXXCastPath *BasePath,
1349 bool IgnoreAccess) {
1350 return CheckDerivedToBaseConversion(Derived, Base,
1352 : diag::err_upcast_to_inaccessible_base,
1353 diag::err_ambiguous_derived_to_base_conv,
1354 Loc, Range, DeclarationName(),
1359 /// @brief Builds a string representing ambiguous paths from a
1360 /// specific derived class to different subobjects of the same base
1363 /// This function builds a string that can be used in error messages
1364 /// to show the different paths that one can take through the
1365 /// inheritance hierarchy to go from the derived class to different
1366 /// subobjects of a base class. The result looks something like this:
1368 /// struct D -> struct B -> struct A
1369 /// struct D -> struct C -> struct A
1371 std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) {
1372 std::string PathDisplayStr;
1373 std::set<unsigned> DisplayedPaths;
1374 for (CXXBasePaths::paths_iterator Path = Paths.begin();
1375 Path != Paths.end(); ++Path) {
1376 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) {
1377 // We haven't displayed a path to this particular base
1378 // class subobject yet.
1379 PathDisplayStr += "\n ";
1380 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString();
1381 for (CXXBasePath::const_iterator Element = Path->begin();
1382 Element != Path->end(); ++Element)
1383 PathDisplayStr += " -> " + Element->Base->getType().getAsString();
1387 return PathDisplayStr;
1390 //===----------------------------------------------------------------------===//
1391 // C++ class member Handling
1392 //===----------------------------------------------------------------------===//
1394 /// ActOnAccessSpecifier - Parsed an access specifier followed by a colon.
1395 bool Sema::ActOnAccessSpecifier(AccessSpecifier Access,
1396 SourceLocation ASLoc,
1397 SourceLocation ColonLoc,
1398 AttributeList *Attrs) {
1399 assert(Access != AS_none && "Invalid kind for syntactic access specifier!");
1400 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext,
1402 CurContext->addHiddenDecl(ASDecl);
1403 return ProcessAccessDeclAttributeList(ASDecl, Attrs);
1406 /// CheckOverrideControl - Check C++0x override control semantics.
1407 void Sema::CheckOverrideControl(const Decl *D) {
1408 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D);
1409 if (!MD || !MD->isVirtual())
1412 if (MD->isDependentContext())
1415 // C++0x [class.virtual]p3:
1416 // If a virtual function is marked with the virt-specifier override and does
1417 // not override a member function of a base class,
1418 // the program is ill-formed.
1419 bool HasOverriddenMethods =
1420 MD->begin_overridden_methods() != MD->end_overridden_methods();
1421 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) {
1422 Diag(MD->getLocation(),
1423 diag::err_function_marked_override_not_overriding)
1424 << MD->getDeclName();
1429 /// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member
1430 /// function overrides a virtual member function marked 'final', according to
1431 /// C++0x [class.virtual]p3.
1432 bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New,
1433 const CXXMethodDecl *Old) {
1434 if (!Old->hasAttr<FinalAttr>())
1437 Diag(New->getLocation(), diag::err_final_function_overridden)
1438 << New->getDeclName();
1439 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
1443 /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member
1444 /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the
1445 /// bitfield width if there is one, 'InitExpr' specifies the initializer if
1446 /// one has been parsed, and 'HasDeferredInit' is true if an initializer is
1447 /// present but parsing it has been deferred.
1449 Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
1450 MultiTemplateParamsArg TemplateParameterLists,
1451 Expr *BW, const VirtSpecifiers &VS,
1452 bool HasDeferredInit) {
1453 const DeclSpec &DS = D.getDeclSpec();
1454 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
1455 DeclarationName Name = NameInfo.getName();
1456 SourceLocation Loc = NameInfo.getLoc();
1458 // For anonymous bitfields, the location should point to the type.
1459 if (Loc.isInvalid())
1460 Loc = D.getLocStart();
1462 Expr *BitWidth = static_cast<Expr*>(BW);
1464 assert(isa<CXXRecordDecl>(CurContext));
1465 assert(!DS.isFriendSpecified());
1467 bool isFunc = D.isDeclarationOfFunction();
1469 // C++ 9.2p6: A member shall not be declared to have automatic storage
1470 // duration (auto, register) or with the extern storage-class-specifier.
1471 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class
1472 // data members and cannot be applied to names declared const or static,
1473 // and cannot be applied to reference members.
1474 switch (DS.getStorageClassSpec()) {
1475 case DeclSpec::SCS_unspecified:
1476 case DeclSpec::SCS_typedef:
1477 case DeclSpec::SCS_static:
1480 case DeclSpec::SCS_mutable:
1482 if (DS.getStorageClassSpecLoc().isValid())
1483 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function);
1485 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function);
1487 // FIXME: It would be nicer if the keyword was ignored only for this
1488 // declarator. Otherwise we could get follow-up errors.
1489 D.getMutableDeclSpec().ClearStorageClassSpecs();
1493 if (DS.getStorageClassSpecLoc().isValid())
1494 Diag(DS.getStorageClassSpecLoc(),
1495 diag::err_storageclass_invalid_for_member);
1497 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member);
1498 D.getMutableDeclSpec().ClearStorageClassSpecs();
1501 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
1502 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
1507 CXXScopeSpec &SS = D.getCXXScopeSpec();
1509 // Data members must have identifiers for names.
1510 if (Name.getNameKind() != DeclarationName::Identifier) {
1511 Diag(Loc, diag::err_bad_variable_name)
1516 IdentifierInfo *II = Name.getAsIdentifierInfo();
1518 // Member field could not be with "template" keyword.
1519 // So TemplateParameterLists should be empty in this case.
1520 if (TemplateParameterLists.size()) {
1521 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0];
1522 if (TemplateParams->size()) {
1523 // There is no such thing as a member field template.
1524 Diag(D.getIdentifierLoc(), diag::err_template_member)
1526 << SourceRange(TemplateParams->getTemplateLoc(),
1527 TemplateParams->getRAngleLoc());
1529 // There is an extraneous 'template<>' for this member.
1530 Diag(TemplateParams->getTemplateLoc(),
1531 diag::err_template_member_noparams)
1533 << SourceRange(TemplateParams->getTemplateLoc(),
1534 TemplateParams->getRAngleLoc());
1539 if (SS.isSet() && !SS.isInvalid()) {
1540 // The user provided a superfluous scope specifier inside a class
1546 if (DeclContext *DC = computeDeclContext(SS, false))
1547 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc());
1549 Diag(D.getIdentifierLoc(), diag::err_member_qualification)
1550 << Name << SS.getRange();
1555 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth,
1556 HasDeferredInit, AS);
1557 assert(Member && "HandleField never returns null");
1559 assert(!HasDeferredInit);
1561 Member = HandleDeclarator(S, D, move(TemplateParameterLists));
1566 // Non-instance-fields can't have a bitfield.
1568 if (Member->isInvalidDecl()) {
1569 // don't emit another diagnostic.
1570 } else if (isa<VarDecl>(Member)) {
1571 // C++ 9.6p3: A bit-field shall not be a static member.
1572 // "static member 'A' cannot be a bit-field"
1573 Diag(Loc, diag::err_static_not_bitfield)
1574 << Name << BitWidth->getSourceRange();
1575 } else if (isa<TypedefDecl>(Member)) {
1576 // "typedef member 'x' cannot be a bit-field"
1577 Diag(Loc, diag::err_typedef_not_bitfield)
1578 << Name << BitWidth->getSourceRange();
1580 // A function typedef ("typedef int f(); f a;").
1581 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
1582 Diag(Loc, diag::err_not_integral_type_bitfield)
1583 << Name << cast<ValueDecl>(Member)->getType()
1584 << BitWidth->getSourceRange();
1588 Member->setInvalidDecl();
1591 Member->setAccess(AS);
1593 // If we have declared a member function template, set the access of the
1594 // templated declaration as well.
1595 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member))
1596 FunTmpl->getTemplatedDecl()->setAccess(AS);
1599 if (VS.isOverrideSpecified()) {
1600 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member);
1601 if (!MD || !MD->isVirtual()) {
1602 Diag(Member->getLocStart(),
1603 diag::override_keyword_only_allowed_on_virtual_member_functions)
1604 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc());
1606 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context));
1608 if (VS.isFinalSpecified()) {
1609 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member);
1610 if (!MD || !MD->isVirtual()) {
1611 Diag(Member->getLocStart(),
1612 diag::override_keyword_only_allowed_on_virtual_member_functions)
1613 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc());
1615 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context));
1618 if (VS.getLastLocation().isValid()) {
1619 // Update the end location of a method that has a virt-specifiers.
1620 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member))
1621 MD->setRangeEnd(VS.getLastLocation());
1624 CheckOverrideControl(Member);
1626 assert((Name || isInstField) && "No identifier for non-field ?");
1629 FieldCollector->Add(cast<FieldDecl>(Member));
1633 /// ActOnCXXInClassMemberInitializer - This is invoked after parsing an
1634 /// in-class initializer for a non-static C++ class member, and after
1635 /// instantiating an in-class initializer in a class template. Such actions
1636 /// are deferred until the class is complete.
1638 Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc,
1640 FieldDecl *FD = cast<FieldDecl>(D);
1643 FD->setInvalidDecl();
1644 FD->removeInClassInitializer();
1648 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) {
1649 FD->setInvalidDecl();
1650 FD->removeInClassInitializer();
1654 ExprResult Init = InitExpr;
1655 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) {
1656 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) {
1657 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list)
1658 << /*at end of ctor*/1 << InitExpr->getSourceRange();
1660 Expr **Inits = &InitExpr;
1661 unsigned NumInits = 1;
1662 InitializedEntity Entity = InitializedEntity::InitializeMember(FD);
1663 InitializationKind Kind = EqualLoc.isInvalid()
1664 ? InitializationKind::CreateDirectList(InitExpr->getLocStart())
1665 : InitializationKind::CreateCopy(InitExpr->getLocStart(), EqualLoc);
1666 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits);
1667 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits));
1668 if (Init.isInvalid()) {
1669 FD->setInvalidDecl();
1673 CheckImplicitConversions(Init.get(), EqualLoc);
1676 // C++0x [class.base.init]p7:
1677 // The initialization of each base and member constitutes a
1679 Init = MaybeCreateExprWithCleanups(Init);
1680 if (Init.isInvalid()) {
1681 FD->setInvalidDecl();
1685 InitExpr = Init.release();
1687 FD->setInClassInitializer(InitExpr);
1690 /// \brief Find the direct and/or virtual base specifiers that
1691 /// correspond to the given base type, for use in base initialization
1692 /// within a constructor.
1693 static bool FindBaseInitializer(Sema &SemaRef,
1694 CXXRecordDecl *ClassDecl,
1696 const CXXBaseSpecifier *&DirectBaseSpec,
1697 const CXXBaseSpecifier *&VirtualBaseSpec) {
1698 // First, check for a direct base class.
1700 for (CXXRecordDecl::base_class_const_iterator Base
1701 = ClassDecl->bases_begin();
1702 Base != ClassDecl->bases_end(); ++Base) {
1703 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) {
1704 // We found a direct base of this type. That's what we're
1706 DirectBaseSpec = &*Base;
1711 // Check for a virtual base class.
1712 // FIXME: We might be able to short-circuit this if we know in advance that
1713 // there are no virtual bases.
1714 VirtualBaseSpec = 0;
1715 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) {
1716 // We haven't found a base yet; search the class hierarchy for a
1717 // virtual base class.
1718 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1719 /*DetectVirtual=*/false);
1720 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl),
1722 for (CXXBasePaths::paths_iterator Path = Paths.begin();
1723 Path != Paths.end(); ++Path) {
1724 if (Path->back().Base->isVirtual()) {
1725 VirtualBaseSpec = Path->back().Base;
1732 return DirectBaseSpec || VirtualBaseSpec;
1735 /// \brief Handle a C++ member initializer using braced-init-list syntax.
1737 Sema::ActOnMemInitializer(Decl *ConstructorD,
1740 IdentifierInfo *MemberOrBase,
1741 ParsedType TemplateTypeTy,
1743 SourceLocation IdLoc,
1745 SourceLocation EllipsisLoc) {
1746 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
1747 DS, IdLoc, InitList,
1751 /// \brief Handle a C++ member initializer using parentheses syntax.
1753 Sema::ActOnMemInitializer(Decl *ConstructorD,
1756 IdentifierInfo *MemberOrBase,
1757 ParsedType TemplateTypeTy,
1759 SourceLocation IdLoc,
1760 SourceLocation LParenLoc,
1761 Expr **Args, unsigned NumArgs,
1762 SourceLocation RParenLoc,
1763 SourceLocation EllipsisLoc) {
1764 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs,
1766 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
1767 DS, IdLoc, List, EllipsisLoc);
1772 // Callback to only accept typo corrections that can be a valid C++ member
1773 // intializer: either a non-static field member or a base class.
1774 class MemInitializerValidatorCCC : public CorrectionCandidateCallback {
1776 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl)
1777 : ClassDecl(ClassDecl) {}
1779 virtual bool ValidateCandidate(const TypoCorrection &candidate) {
1780 if (NamedDecl *ND = candidate.getCorrectionDecl()) {
1781 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND))
1782 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl);
1784 return isa<TypeDecl>(ND);
1790 CXXRecordDecl *ClassDecl;
1795 /// \brief Handle a C++ member initializer.
1797 Sema::BuildMemInitializer(Decl *ConstructorD,
1800 IdentifierInfo *MemberOrBase,
1801 ParsedType TemplateTypeTy,
1803 SourceLocation IdLoc,
1805 SourceLocation EllipsisLoc) {
1809 AdjustDeclIfTemplate(ConstructorD);
1811 CXXConstructorDecl *Constructor
1812 = dyn_cast<CXXConstructorDecl>(ConstructorD);
1814 // The user wrote a constructor initializer on a function that is
1815 // not a C++ constructor. Ignore the error for now, because we may
1816 // have more member initializers coming; we'll diagnose it just
1817 // once in ActOnMemInitializers.
1821 CXXRecordDecl *ClassDecl = Constructor->getParent();
1823 // C++ [class.base.init]p2:
1824 // Names in a mem-initializer-id are looked up in the scope of the
1825 // constructor's class and, if not found in that scope, are looked
1826 // up in the scope containing the constructor's definition.
1827 // [Note: if the constructor's class contains a member with the
1828 // same name as a direct or virtual base class of the class, a
1829 // mem-initializer-id naming the member or base class and composed
1830 // of a single identifier refers to the class member. A
1831 // mem-initializer-id for the hidden base class may be specified
1832 // using a qualified name. ]
1833 if (!SS.getScopeRep() && !TemplateTypeTy) {
1834 // Look for a member, first.
1835 DeclContext::lookup_result Result
1836 = ClassDecl->lookup(MemberOrBase);
1837 if (Result.first != Result.second) {
1839 if ((Member = dyn_cast<FieldDecl>(*Result.first)) ||
1840 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) {
1841 if (EllipsisLoc.isValid())
1842 Diag(EllipsisLoc, diag::err_pack_expansion_member_init)
1844 << SourceRange(IdLoc, Init->getSourceRange().getEnd());
1846 return BuildMemberInitializer(Member, Init, IdLoc);
1850 // It didn't name a member, so see if it names a class.
1852 TypeSourceInfo *TInfo = 0;
1854 if (TemplateTypeTy) {
1855 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo);
1856 } else if (DS.getTypeSpecType() == TST_decltype) {
1857 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc());
1859 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName);
1860 LookupParsedName(R, S, &SS);
1862 TypeDecl *TyD = R.getAsSingle<TypeDecl>();
1864 if (R.isAmbiguous()) return true;
1866 // We don't want access-control diagnostics here.
1867 R.suppressDiagnostics();
1869 if (SS.isSet() && isDependentScopeSpecifier(SS)) {
1870 bool NotUnknownSpecialization = false;
1871 DeclContext *DC = computeDeclContext(SS, false);
1872 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC))
1873 NotUnknownSpecialization = !Record->hasAnyDependentBases();
1875 if (!NotUnknownSpecialization) {
1876 // When the scope specifier can refer to a member of an unknown
1877 // specialization, we take it as a type name.
1878 BaseType = CheckTypenameType(ETK_None, SourceLocation(),
1879 SS.getWithLocInContext(Context),
1880 *MemberOrBase, IdLoc);
1881 if (BaseType.isNull())
1885 R.setLookupName(MemberOrBase);
1889 // If no results were found, try to correct typos.
1890 TypoCorrection Corr;
1891 MemInitializerValidatorCCC Validator(ClassDecl);
1892 if (R.empty() && BaseType.isNull() &&
1893 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS,
1894 Validator, ClassDecl))) {
1895 std::string CorrectedStr(Corr.getAsString(getLangOpts()));
1896 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts()));
1897 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) {
1898 // We have found a non-static data member with a similar
1899 // name to what was typed; complain and initialize that
1901 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest)
1902 << MemberOrBase << true << CorrectedQuotedStr
1903 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr);
1904 Diag(Member->getLocation(), diag::note_previous_decl)
1905 << CorrectedQuotedStr;
1907 return BuildMemberInitializer(Member, Init, IdLoc);
1908 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) {
1909 const CXXBaseSpecifier *DirectBaseSpec;
1910 const CXXBaseSpecifier *VirtualBaseSpec;
1911 if (FindBaseInitializer(*this, ClassDecl,
1912 Context.getTypeDeclType(Type),
1913 DirectBaseSpec, VirtualBaseSpec)) {
1914 // We have found a direct or virtual base class with a
1915 // similar name to what was typed; complain and initialize
1917 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest)
1918 << MemberOrBase << false << CorrectedQuotedStr
1919 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr);
1921 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec
1923 Diag(BaseSpec->getLocStart(),
1924 diag::note_base_class_specified_here)
1925 << BaseSpec->getType()
1926 << BaseSpec->getSourceRange();
1933 if (!TyD && BaseType.isNull()) {
1934 Diag(IdLoc, diag::err_mem_init_not_member_or_class)
1935 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd());
1940 if (BaseType.isNull()) {
1941 BaseType = Context.getTypeDeclType(TyD);
1943 NestedNameSpecifier *Qualifier =
1944 static_cast<NestedNameSpecifier*>(SS.getScopeRep());
1946 // FIXME: preserve source range information
1947 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType);
1953 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc);
1955 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc);
1958 /// Checks a member initializer expression for cases where reference (or
1959 /// pointer) members are bound to by-value parameters (or their addresses).
1960 static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member,
1962 SourceLocation IdLoc) {
1963 QualType MemberTy = Member->getType();
1965 // We only handle pointers and references currently.
1966 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers?
1967 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType())
1970 const bool IsPointer = MemberTy->isPointerType();
1972 if (const UnaryOperator *Op
1973 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) {
1974 // The only case we're worried about with pointers requires taking the
1976 if (Op->getOpcode() != UO_AddrOf)
1979 Init = Op->getSubExpr();
1981 // We only handle address-of expression initializers for pointers.
1986 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) {
1987 // Taking the address of a temporary will be diagnosed as a hard error.
1991 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary)
1992 << Member << Init->getSourceRange();
1993 } else if (const DeclRefExpr *DRE
1994 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) {
1995 // We only warn when referring to a non-reference parameter declaration.
1996 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl());
1997 if (!Parameter || Parameter->getType()->isReferenceType())
2000 S.Diag(Init->getExprLoc(),
2001 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr
2002 : diag::warn_bind_ref_member_to_parameter)
2003 << Member << Parameter << Init->getSourceRange();
2005 // Other initializers are fine.
2009 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here)
2010 << (unsigned)IsPointer;
2013 /// Checks an initializer expression for use of uninitialized fields, such as
2014 /// containing the field that is being initialized. Returns true if there is an
2015 /// uninitialized field was used an updates the SourceLocation parameter; false
2017 static bool InitExprContainsUninitializedFields(const Stmt *S,
2018 const ValueDecl *LhsField,
2019 SourceLocation *L) {
2020 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField));
2022 if (isa<CallExpr>(S)) {
2023 // Do not descend into function calls or constructors, as the use
2024 // of an uninitialized field may be valid. One would have to inspect
2025 // the contents of the function/ctor to determine if it is safe or not.
2026 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers
2027 // may be safe, depending on what the function/ctor does.
2030 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) {
2031 const NamedDecl *RhsField = ME->getMemberDecl();
2033 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) {
2034 // The member expression points to a static data member.
2035 assert(VD->isStaticDataMember() &&
2036 "Member points to non-static data member!");
2041 if (isa<EnumConstantDecl>(RhsField)) {
2042 // The member expression points to an enum.
2046 if (RhsField == LhsField) {
2047 // Initializing a field with itself. Throw a warning.
2048 // But wait; there are exceptions!
2049 // Exception #1: The field may not belong to this record.
2050 // e.g. Foo(const Foo& rhs) : A(rhs.A) {}
2051 const Expr *base = ME->getBase();
2052 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) {
2053 // Even though the field matches, it does not belong to this record.
2056 // None of the exceptions triggered; return true to indicate an
2057 // uninitialized field was used.
2058 *L = ME->getMemberLoc();
2061 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) {
2062 // sizeof/alignof doesn't reference contents, do not warn.
2064 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) {
2065 // address-of doesn't reference contents (the pointer may be dereferenced
2066 // in the same expression but it would be rare; and weird).
2067 if (UOE->getOpcode() == UO_AddrOf)
2070 for (Stmt::const_child_range it = S->children(); it; ++it) {
2072 // An expression such as 'member(arg ?: "")' may trigger this.
2075 if (InitExprContainsUninitializedFields(*it, LhsField, L))
2082 Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init,
2083 SourceLocation IdLoc) {
2084 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member);
2085 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member);
2086 assert((DirectMember || IndirectMember) &&
2087 "Member must be a FieldDecl or IndirectFieldDecl");
2089 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
2092 if (Member->isInvalidDecl())
2095 // Diagnose value-uses of fields to initialize themselves, e.g.
2097 // where foo is not also a parameter to the constructor.
2098 // TODO: implement -Wuninitialized and fold this into that framework.
2101 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
2102 Args = ParenList->getExprs();
2103 NumArgs = ParenList->getNumExprs();
2105 InitListExpr *InitList = cast<InitListExpr>(Init);
2106 Args = InitList->getInits();
2107 NumArgs = InitList->getNumInits();
2109 for (unsigned i = 0; i < NumArgs; ++i) {
2111 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) {
2112 // FIXME: Return true in the case when other fields are used before being
2113 // uninitialized. For example, let this field be the i'th field. When
2114 // initializing the i'th field, throw a warning if any of the >= i'th
2115 // fields are used, as they are not yet initialized.
2116 // Right now we are only handling the case where the i'th field uses
2117 // itself in its initializer.
2118 Diag(L, diag::warn_field_is_uninit);
2122 SourceRange InitRange = Init->getSourceRange();
2124 if (Member->getType()->isDependentType() || Init->isTypeDependent()) {
2125 // Can't check initialization for a member of dependent type or when
2126 // any of the arguments are type-dependent expressions.
2127 DiscardCleanupsInEvaluationContext();
2129 bool InitList = false;
2130 if (isa<InitListExpr>(Init)) {
2135 if (isStdInitializerList(Member->getType(), 0)) {
2136 Diag(IdLoc, diag::warn_dangling_std_initializer_list)
2137 << /*at end of ctor*/1 << InitRange;
2141 // Initialize the member.
2142 InitializedEntity MemberEntity =
2143 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0)
2144 : InitializedEntity::InitializeMember(IndirectMember, 0);
2145 InitializationKind Kind =
2146 InitList ? InitializationKind::CreateDirectList(IdLoc)
2147 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(),
2148 InitRange.getEnd());
2150 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs);
2151 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind,
2152 MultiExprArg(*this, Args, NumArgs),
2154 if (MemberInit.isInvalid())
2157 CheckImplicitConversions(MemberInit.get(),
2158 InitRange.getBegin());
2160 // C++0x [class.base.init]p7:
2161 // The initialization of each base and member constitutes a
2163 MemberInit = MaybeCreateExprWithCleanups(MemberInit);
2164 if (MemberInit.isInvalid())
2167 // If we are in a dependent context, template instantiation will
2168 // perform this type-checking again. Just save the arguments that we
2170 // FIXME: This isn't quite ideal, since our ASTs don't capture all
2171 // of the information that we have about the member
2172 // initializer. However, deconstructing the ASTs is a dicey process,
2173 // and this approach is far more likely to get the corner cases right.
2174 if (CurContext->isDependentContext()) {
2175 // The existing Init will do fine.
2177 Init = MemberInit.get();
2178 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc);
2183 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc,
2184 InitRange.getBegin(), Init,
2185 InitRange.getEnd());
2187 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc,
2188 InitRange.getBegin(), Init,
2189 InitRange.getEnd());
2194 Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init,
2195 CXXRecordDecl *ClassDecl) {
2196 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin();
2197 if (!LangOpts.CPlusPlus0x)
2198 return Diag(NameLoc, diag::err_delegating_ctor)
2199 << TInfo->getTypeLoc().getLocalSourceRange();
2200 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor);
2202 bool InitList = true;
2203 Expr **Args = &Init;
2204 unsigned NumArgs = 1;
2205 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
2207 Args = ParenList->getExprs();
2208 NumArgs = ParenList->getNumExprs();
2211 SourceRange InitRange = Init->getSourceRange();
2212 // Initialize the object.
2213 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation(
2214 QualType(ClassDecl->getTypeForDecl(), 0));
2215 InitializationKind Kind =
2216 InitList ? InitializationKind::CreateDirectList(NameLoc)
2217 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(),
2218 InitRange.getEnd());
2219 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs);
2220 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind,
2221 MultiExprArg(*this, Args,NumArgs),
2223 if (DelegationInit.isInvalid())
2226 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() &&
2227 "Delegating constructor with no target?");
2229 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin());
2231 // C++0x [class.base.init]p7:
2232 // The initialization of each base and member constitutes a
2234 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit);
2235 if (DelegationInit.isInvalid())
2238 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(),
2239 DelegationInit.takeAs<Expr>(),
2240 InitRange.getEnd());
2244 Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo,
2245 Expr *Init, CXXRecordDecl *ClassDecl,
2246 SourceLocation EllipsisLoc) {
2247 SourceLocation BaseLoc
2248 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin();
2250 if (!BaseType->isDependentType() && !BaseType->isRecordType())
2251 return Diag(BaseLoc, diag::err_base_init_does_not_name_class)
2252 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
2254 // C++ [class.base.init]p2:
2255 // [...] Unless the mem-initializer-id names a nonstatic data
2256 // member of the constructor's class or a direct or virtual base
2257 // of that class, the mem-initializer is ill-formed. A
2258 // mem-initializer-list can initialize a base class using any
2259 // name that denotes that base class type.
2260 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent();
2262 SourceRange InitRange = Init->getSourceRange();
2263 if (EllipsisLoc.isValid()) {
2264 // This is a pack expansion.
2265 if (!BaseType->containsUnexpandedParameterPack()) {
2266 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
2267 << SourceRange(BaseLoc, InitRange.getEnd());
2269 EllipsisLoc = SourceLocation();
2272 // Check for any unexpanded parameter packs.
2273 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer))
2276 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
2280 // Check for direct and virtual base classes.
2281 const CXXBaseSpecifier *DirectBaseSpec = 0;
2282 const CXXBaseSpecifier *VirtualBaseSpec = 0;
2284 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0),
2286 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl);
2288 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec,
2291 // C++ [base.class.init]p2:
2292 // Unless the mem-initializer-id names a nonstatic data member of the
2293 // constructor's class or a direct or virtual base of that class, the
2294 // mem-initializer is ill-formed.
2295 if (!DirectBaseSpec && !VirtualBaseSpec) {
2296 // If the class has any dependent bases, then it's possible that
2297 // one of those types will resolve to the same type as
2298 // BaseType. Therefore, just treat this as a dependent base
2299 // class initialization. FIXME: Should we try to check the
2300 // initialization anyway? It seems odd.
2301 if (ClassDecl->hasAnyDependentBases())
2304 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual)
2305 << BaseType << Context.getTypeDeclType(ClassDecl)
2306 << BaseTInfo->getTypeLoc().getLocalSourceRange();
2311 DiscardCleanupsInEvaluationContext();
2313 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
2314 /*IsVirtual=*/false,
2315 InitRange.getBegin(), Init,
2316 InitRange.getEnd(), EllipsisLoc);
2319 // C++ [base.class.init]p2:
2320 // If a mem-initializer-id is ambiguous because it designates both
2321 // a direct non-virtual base class and an inherited virtual base
2322 // class, the mem-initializer is ill-formed.
2323 if (DirectBaseSpec && VirtualBaseSpec)
2324 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual)
2325 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
2327 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec);
2329 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec);
2331 // Initialize the base.
2332 bool InitList = true;
2333 Expr **Args = &Init;
2334 unsigned NumArgs = 1;
2335 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
2337 Args = ParenList->getExprs();
2338 NumArgs = ParenList->getNumExprs();
2341 InitializedEntity BaseEntity =
2342 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec);
2343 InitializationKind Kind =
2344 InitList ? InitializationKind::CreateDirectList(BaseLoc)
2345 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(),
2346 InitRange.getEnd());
2347 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs);
2348 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind,
2349 MultiExprArg(*this, Args, NumArgs),
2351 if (BaseInit.isInvalid())
2354 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin());
2356 // C++0x [class.base.init]p7:
2357 // The initialization of each base and member constitutes a
2359 BaseInit = MaybeCreateExprWithCleanups(BaseInit);
2360 if (BaseInit.isInvalid())
2363 // If we are in a dependent context, template instantiation will
2364 // perform this type-checking again. Just save the arguments that we
2365 // received in a ParenListExpr.
2366 // FIXME: This isn't quite ideal, since our ASTs don't capture all
2367 // of the information that we have about the base
2368 // initializer. However, deconstructing the ASTs is a dicey process,
2369 // and this approach is far more likely to get the corner cases right.
2370 if (CurContext->isDependentContext())
2371 BaseInit = Owned(Init);
2373 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
2374 BaseSpec->isVirtual(),
2375 InitRange.getBegin(),
2376 BaseInit.takeAs<Expr>(),
2377 InitRange.getEnd(), EllipsisLoc);
2380 // Create a static_cast\<T&&>(expr).
2381 static Expr *CastForMoving(Sema &SemaRef, Expr *E) {
2382 QualType ExprType = E->getType();
2383 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType);
2384 SourceLocation ExprLoc = E->getLocStart();
2385 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo(
2386 TargetType, ExprLoc);
2388 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E,
2389 SourceRange(ExprLoc, ExprLoc),
2390 E->getSourceRange()).take();
2393 /// ImplicitInitializerKind - How an implicit base or member initializer should
2394 /// initialize its base or member.
2395 enum ImplicitInitializerKind {
2402 BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
2403 ImplicitInitializerKind ImplicitInitKind,
2404 CXXBaseSpecifier *BaseSpec,
2405 bool IsInheritedVirtualBase,
2406 CXXCtorInitializer *&CXXBaseInit) {
2407 InitializedEntity InitEntity
2408 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec,
2409 IsInheritedVirtualBase);
2411 ExprResult BaseInit;
2413 switch (ImplicitInitKind) {
2415 InitializationKind InitKind
2416 = InitializationKind::CreateDefault(Constructor->getLocation());
2417 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0);
2418 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind,
2419 MultiExprArg(SemaRef, 0, 0));
2425 bool Moving = ImplicitInitKind == IIK_Move;
2426 ParmVarDecl *Param = Constructor->getParamDecl(0);
2427 QualType ParamType = Param->getType().getNonReferenceType();
2430 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
2431 SourceLocation(), Param, false,
2432 Constructor->getLocation(), ParamType,
2435 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg));
2437 // Cast to the base class to avoid ambiguities.
2439 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(),
2440 ParamType.getQualifiers());
2443 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg);
2446 CXXCastPath BasePath;
2447 BasePath.push_back(BaseSpec);
2448 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy,
2449 CK_UncheckedDerivedToBase,
2450 Moving ? VK_XValue : VK_LValue,
2453 InitializationKind InitKind
2454 = InitializationKind::CreateDirect(Constructor->getLocation(),
2455 SourceLocation(), SourceLocation());
2456 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind,
2458 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind,
2459 MultiExprArg(&CopyCtorArg, 1));
2464 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit);
2465 if (BaseInit.isInvalid())
2469 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
2470 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(),
2472 BaseSpec->isVirtual(),
2474 BaseInit.takeAs<Expr>(),
2481 static bool RefersToRValueRef(Expr *MemRef) {
2482 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl();
2483 return Referenced->getType()->isRValueReferenceType();
2487 BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
2488 ImplicitInitializerKind ImplicitInitKind,
2489 FieldDecl *Field, IndirectFieldDecl *Indirect,
2490 CXXCtorInitializer *&CXXMemberInit) {
2491 if (Field->isInvalidDecl())
2494 SourceLocation Loc = Constructor->getLocation();
2496 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) {
2497 bool Moving = ImplicitInitKind == IIK_Move;
2498 ParmVarDecl *Param = Constructor->getParamDecl(0);
2499 QualType ParamType = Param->getType().getNonReferenceType();
2501 // Suppress copying zero-width bitfields.
2502 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0)
2505 Expr *MemberExprBase =
2506 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
2507 SourceLocation(), Param, false,
2508 Loc, ParamType, VK_LValue, 0);
2510 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase));
2513 MemberExprBase = CastForMoving(SemaRef, MemberExprBase);
2516 // Build a reference to this field within the parameter.
2518 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc,
2519 Sema::LookupMemberName);
2520 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect)
2521 : cast<ValueDecl>(Field), AS_public);
2522 MemberLookup.resolveKind();
2524 = SemaRef.BuildMemberReferenceExpr(MemberExprBase,
2528 /*TemplateKWLoc=*/SourceLocation(),
2529 /*FirstQualifierInScope=*/0,
2531 /*TemplateArgs=*/0);
2532 if (CtorArg.isInvalid())
2535 // C++11 [class.copy]p15:
2536 // - if a member m has rvalue reference type T&&, it is direct-initialized
2537 // with static_cast<T&&>(x.m);
2538 if (RefersToRValueRef(CtorArg.get())) {
2539 CtorArg = CastForMoving(SemaRef, CtorArg.take());
2542 // When the field we are copying is an array, create index variables for
2543 // each dimension of the array. We use these index variables to subscript
2544 // the source array, and other clients (e.g., CodeGen) will perform the
2545 // necessary iteration with these index variables.
2546 SmallVector<VarDecl *, 4> IndexVariables;
2547 QualType BaseType = Field->getType();
2548 QualType SizeType = SemaRef.Context.getSizeType();
2549 bool InitializingArray = false;
2550 while (const ConstantArrayType *Array
2551 = SemaRef.Context.getAsConstantArrayType(BaseType)) {
2552 InitializingArray = true;
2553 // Create the iteration variable for this array index.
2554 IdentifierInfo *IterationVarName = 0;
2557 llvm::raw_svector_ostream OS(Str);
2558 OS << "__i" << IndexVariables.size();
2559 IterationVarName = &SemaRef.Context.Idents.get(OS.str());
2561 VarDecl *IterationVar
2562 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc,
2563 IterationVarName, SizeType,
2564 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc),
2566 IndexVariables.push_back(IterationVar);
2568 // Create a reference to the iteration variable.
2569 ExprResult IterationVarRef
2570 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc);
2571 assert(!IterationVarRef.isInvalid() &&
2572 "Reference to invented variable cannot fail!");
2573 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take());
2574 assert(!IterationVarRef.isInvalid() &&
2575 "Conversion of invented variable cannot fail!");
2577 // Subscript the array with this iteration variable.
2578 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc,
2579 IterationVarRef.take(),
2581 if (CtorArg.isInvalid())
2584 BaseType = Array->getElementType();
2587 // The array subscript expression is an lvalue, which is wrong for moving.
2588 if (Moving && InitializingArray)
2589 CtorArg = CastForMoving(SemaRef, CtorArg.take());
2591 // Construct the entity that we will be initializing. For an array, this
2592 // will be first element in the array, which may require several levels
2593 // of array-subscript entities.
2594 SmallVector<InitializedEntity, 4> Entities;
2595 Entities.reserve(1 + IndexVariables.size());
2597 Entities.push_back(InitializedEntity::InitializeMember(Indirect));
2599 Entities.push_back(InitializedEntity::InitializeMember(Field));
2600 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I)
2601 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context,
2605 // Direct-initialize to use the copy constructor.
2606 InitializationKind InitKind =
2607 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation());
2609 Expr *CtorArgE = CtorArg.takeAs<Expr>();
2610 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind,
2613 ExprResult MemberInit
2614 = InitSeq.Perform(SemaRef, Entities.back(), InitKind,
2615 MultiExprArg(&CtorArgE, 1));
2616 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
2617 if (MemberInit.isInvalid())
2621 assert(IndexVariables.size() == 0 &&
2622 "Indirect field improperly initialized");
2624 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect,
2626 MemberInit.takeAs<Expr>(),
2629 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc,
2630 Loc, MemberInit.takeAs<Expr>(),
2632 IndexVariables.data(),
2633 IndexVariables.size());
2637 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!");
2639 QualType FieldBaseElementType =
2640 SemaRef.Context.getBaseElementType(Field->getType());
2642 if (FieldBaseElementType->isRecordType()) {
2643 InitializedEntity InitEntity
2644 = Indirect? InitializedEntity::InitializeMember(Indirect)
2645 : InitializedEntity::InitializeMember(Field);
2646 InitializationKind InitKind =
2647 InitializationKind::CreateDefault(Loc);
2649 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0);
2650 ExprResult MemberInit =
2651 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg());
2653 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
2654 if (MemberInit.isInvalid())
2658 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
2664 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
2671 if (!Field->getParent()->isUnion()) {
2672 if (FieldBaseElementType->isReferenceType()) {
2673 SemaRef.Diag(Constructor->getLocation(),
2674 diag::err_uninitialized_member_in_ctor)
2675 << (int)Constructor->isImplicit()
2676 << SemaRef.Context.getTagDeclType(Constructor->getParent())
2677 << 0 << Field->getDeclName();
2678 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
2682 if (FieldBaseElementType.isConstQualified()) {
2683 SemaRef.Diag(Constructor->getLocation(),
2684 diag::err_uninitialized_member_in_ctor)
2685 << (int)Constructor->isImplicit()
2686 << SemaRef.Context.getTagDeclType(Constructor->getParent())
2687 << 1 << Field->getDeclName();
2688 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
2693 if (SemaRef.getLangOpts().ObjCAutoRefCount &&
2694 FieldBaseElementType->isObjCRetainableType() &&
2695 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None &&
2696 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) {
2698 // Default-initialize Objective-C pointers to NULL.
2700 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field,
2702 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()),
2707 // Nothing to initialize.
2713 struct BaseAndFieldInfo {
2715 CXXConstructorDecl *Ctor;
2716 bool AnyErrorsInInits;
2717 ImplicitInitializerKind IIK;
2718 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields;
2719 SmallVector<CXXCtorInitializer*, 8> AllToInit;
2721 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits)
2722 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) {
2723 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted();
2724 if (Generated && Ctor->isCopyConstructor())
2726 else if (Generated && Ctor->isMoveConstructor())
2732 bool isImplicitCopyOrMove() const {
2742 llvm_unreachable("Invalid ImplicitInitializerKind!");
2747 /// \brief Determine whether the given indirect field declaration is somewhere
2748 /// within an anonymous union.
2749 static bool isWithinAnonymousUnion(IndirectFieldDecl *F) {
2750 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(),
2751 CEnd = F->chain_end();
2753 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext()))
2754 if (Record->isUnion())
2760 /// \brief Determine whether the given type is an incomplete or zero-lenfgth
2762 static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) {
2763 if (T->isIncompleteArrayType())
2766 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) {
2767 if (!ArrayT->getSize())
2770 T = ArrayT->getElementType();
2776 static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info,
2778 IndirectFieldDecl *Indirect = 0) {
2780 // Overwhelmingly common case: we have a direct initializer for this field.
2781 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) {
2782 Info.AllToInit.push_back(Init);
2786 // C++0x [class.base.init]p8: if the entity is a non-static data member that
2787 // has a brace-or-equal-initializer, the entity is initialized as specified
2789 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) {
2790 CXXCtorInitializer *Init;
2792 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect,
2794 SourceLocation(), 0,
2797 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field,
2799 SourceLocation(), 0,
2801 Info.AllToInit.push_back(Init);
2805 // Don't build an implicit initializer for union members if none was
2806 // explicitly specified.
2807 if (Field->getParent()->isUnion() ||
2808 (Indirect && isWithinAnonymousUnion(Indirect)))
2811 // Don't initialize incomplete or zero-length arrays.
2812 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType()))
2815 // Don't try to build an implicit initializer if there were semantic
2816 // errors in any of the initializers (and therefore we might be
2817 // missing some that the user actually wrote).
2818 if (Info.AnyErrorsInInits || Field->isInvalidDecl())
2821 CXXCtorInitializer *Init = 0;
2822 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field,
2827 Info.AllToInit.push_back(Init);
2833 Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor,
2834 CXXCtorInitializer *Initializer) {
2835 assert(Initializer->isDelegatingInitializer());
2836 Constructor->setNumCtorInitializers(1);
2837 CXXCtorInitializer **initializer =
2838 new (Context) CXXCtorInitializer*[1];
2839 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*));
2840 Constructor->setCtorInitializers(initializer);
2842 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) {
2843 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor);
2844 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation());
2847 DelegatingCtorDecls.push_back(Constructor);
2852 bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor,
2853 CXXCtorInitializer **Initializers,
2854 unsigned NumInitializers,
2856 if (Constructor->isDependentContext()) {
2857 // Just store the initializers as written, they will be checked during
2859 if (NumInitializers > 0) {
2860 Constructor->setNumCtorInitializers(NumInitializers);
2861 CXXCtorInitializer **baseOrMemberInitializers =
2862 new (Context) CXXCtorInitializer*[NumInitializers];
2863 memcpy(baseOrMemberInitializers, Initializers,
2864 NumInitializers * sizeof(CXXCtorInitializer*));
2865 Constructor->setCtorInitializers(baseOrMemberInitializers);
2871 BaseAndFieldInfo Info(*this, Constructor, AnyErrors);
2873 // We need to build the initializer AST according to order of construction
2874 // and not what user specified in the Initializers list.
2875 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition();
2879 bool HadError = false;
2881 for (unsigned i = 0; i < NumInitializers; i++) {
2882 CXXCtorInitializer *Member = Initializers[i];
2884 if (Member->isBaseInitializer())
2885 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member;
2887 Info.AllBaseFields[Member->getAnyMember()] = Member;
2890 // Keep track of the direct virtual bases.
2891 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases;
2892 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(),
2893 E = ClassDecl->bases_end(); I != E; ++I) {
2895 DirectVBases.insert(I);
2898 // Push virtual bases before others.
2899 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(),
2900 E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
2902 if (CXXCtorInitializer *Value
2903 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) {
2904 Info.AllToInit.push_back(Value);
2905 } else if (!AnyErrors) {
2906 bool IsInheritedVirtualBase = !DirectVBases.count(VBase);
2907 CXXCtorInitializer *CXXBaseInit;
2908 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
2909 VBase, IsInheritedVirtualBase,
2915 Info.AllToInit.push_back(CXXBaseInit);
2919 // Non-virtual bases.
2920 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
2921 E = ClassDecl->bases_end(); Base != E; ++Base) {
2922 // Virtuals are in the virtual base list and already constructed.
2923 if (Base->isVirtual())
2926 if (CXXCtorInitializer *Value
2927 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) {
2928 Info.AllToInit.push_back(Value);
2929 } else if (!AnyErrors) {
2930 CXXCtorInitializer *CXXBaseInit;
2931 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
2932 Base, /*IsInheritedVirtualBase=*/false,
2938 Info.AllToInit.push_back(CXXBaseInit);
2943 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(),
2944 MemEnd = ClassDecl->decls_end();
2945 Mem != MemEnd; ++Mem) {
2946 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) {
2947 // C++ [class.bit]p2:
2948 // A declaration for a bit-field that omits the identifier declares an
2949 // unnamed bit-field. Unnamed bit-fields are not members and cannot be
2951 if (F->isUnnamedBitfield())
2954 // If we're not generating the implicit copy/move constructor, then we'll
2955 // handle anonymous struct/union fields based on their individual
2957 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default)
2960 if (CollectFieldInitializer(*this, Info, F))
2965 // Beyond this point, we only consider default initialization.
2966 if (Info.IIK != IIK_Default)
2969 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) {
2970 if (F->getType()->isIncompleteArrayType()) {
2971 assert(ClassDecl->hasFlexibleArrayMember() &&
2972 "Incomplete array type is not valid");
2976 // Initialize each field of an anonymous struct individually.
2977 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F))
2984 NumInitializers = Info.AllToInit.size();
2985 if (NumInitializers > 0) {
2986 Constructor->setNumCtorInitializers(NumInitializers);
2987 CXXCtorInitializer **baseOrMemberInitializers =
2988 new (Context) CXXCtorInitializer*[NumInitializers];
2989 memcpy(baseOrMemberInitializers, Info.AllToInit.data(),
2990 NumInitializers * sizeof(CXXCtorInitializer*));
2991 Constructor->setCtorInitializers(baseOrMemberInitializers);
2993 // Constructors implicitly reference the base and member
2995 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(),
2996 Constructor->getParent());
3002 static void *GetKeyForTopLevelField(FieldDecl *Field) {
3003 // For anonymous unions, use the class declaration as the key.
3004 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) {
3005 if (RT->getDecl()->isAnonymousStructOrUnion())
3006 return static_cast<void *>(RT->getDecl());
3008 return static_cast<void *>(Field);
3011 static void *GetKeyForBase(ASTContext &Context, QualType BaseType) {
3012 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr());
3015 static void *GetKeyForMember(ASTContext &Context,
3016 CXXCtorInitializer *Member) {
3017 if (!Member->isAnyMemberInitializer())
3018 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0));
3020 // For fields injected into the class via declaration of an anonymous union,
3021 // use its anonymous union class declaration as the unique key.
3022 FieldDecl *Field = Member->getAnyMember();
3024 // If the field is a member of an anonymous struct or union, our key
3025 // is the anonymous record decl that's a direct child of the class.
3026 RecordDecl *RD = Field->getParent();
3027 if (RD->isAnonymousStructOrUnion()) {
3029 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext());
3030 if (Parent->isAnonymousStructOrUnion())
3036 return static_cast<void *>(RD);
3039 return static_cast<void *>(Field);
3043 DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef,
3044 const CXXConstructorDecl *Constructor,
3045 CXXCtorInitializer **Inits,
3046 unsigned NumInits) {
3047 if (Constructor->getDeclContext()->isDependentContext())
3050 // Don't check initializers order unless the warning is enabled at the
3051 // location of at least one initializer.
3052 bool ShouldCheckOrder = false;
3053 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) {
3054 CXXCtorInitializer *Init = Inits[InitIndex];
3055 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order,
3056 Init->getSourceLocation())
3057 != DiagnosticsEngine::Ignored) {
3058 ShouldCheckOrder = true;
3062 if (!ShouldCheckOrder)
3065 // Build the list of bases and members in the order that they'll
3066 // actually be initialized. The explicit initializers should be in
3067 // this same order but may be missing things.
3068 SmallVector<const void*, 32> IdealInitKeys;
3070 const CXXRecordDecl *ClassDecl = Constructor->getParent();
3072 // 1. Virtual bases.
3073 for (CXXRecordDecl::base_class_const_iterator VBase =
3074 ClassDecl->vbases_begin(),
3075 E = ClassDecl->vbases_end(); VBase != E; ++VBase)
3076 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType()));
3078 // 2. Non-virtual bases.
3079 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(),
3080 E = ClassDecl->bases_end(); Base != E; ++Base) {
3081 if (Base->isVirtual())
3083 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType()));
3086 // 3. Direct fields.
3087 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
3088 E = ClassDecl->field_end(); Field != E; ++Field) {
3089 if (Field->isUnnamedBitfield())
3092 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field));
3095 unsigned NumIdealInits = IdealInitKeys.size();
3096 unsigned IdealIndex = 0;
3098 CXXCtorInitializer *PrevInit = 0;
3099 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) {
3100 CXXCtorInitializer *Init = Inits[InitIndex];
3101 void *InitKey = GetKeyForMember(SemaRef.Context, Init);
3103 // Scan forward to try to find this initializer in the idealized
3104 // initializers list.
3105 for (; IdealIndex != NumIdealInits; ++IdealIndex)
3106 if (InitKey == IdealInitKeys[IdealIndex])
3109 // If we didn't find this initializer, it must be because we
3110 // scanned past it on a previous iteration. That can only
3111 // happen if we're out of order; emit a warning.
3112 if (IdealIndex == NumIdealInits && PrevInit) {
3113 Sema::SemaDiagnosticBuilder D =
3114 SemaRef.Diag(PrevInit->getSourceLocation(),
3115 diag::warn_initializer_out_of_order);
3117 if (PrevInit->isAnyMemberInitializer())
3118 D << 0 << PrevInit->getAnyMember()->getDeclName();
3120 D << 1 << PrevInit->getTypeSourceInfo()->getType();
3122 if (Init->isAnyMemberInitializer())
3123 D << 0 << Init->getAnyMember()->getDeclName();
3125 D << 1 << Init->getTypeSourceInfo()->getType();
3127 // Move back to the initializer's location in the ideal list.
3128 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex)
3129 if (InitKey == IdealInitKeys[IdealIndex])
3132 assert(IdealIndex != NumIdealInits &&
3133 "initializer not found in initializer list");
3141 bool CheckRedundantInit(Sema &S,
3142 CXXCtorInitializer *Init,
3143 CXXCtorInitializer *&PrevInit) {
3149 if (FieldDecl *Field = Init->getMember())
3150 S.Diag(Init->getSourceLocation(),
3151 diag::err_multiple_mem_initialization)
3152 << Field->getDeclName()
3153 << Init->getSourceRange();
3155 const Type *BaseClass = Init->getBaseClass();
3156 assert(BaseClass && "neither field nor base");
3157 S.Diag(Init->getSourceLocation(),
3158 diag::err_multiple_base_initialization)
3159 << QualType(BaseClass, 0)
3160 << Init->getSourceRange();
3162 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer)
3163 << 0 << PrevInit->getSourceRange();
3168 typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry;
3169 typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap;
3171 bool CheckRedundantUnionInit(Sema &S,
3172 CXXCtorInitializer *Init,
3173 RedundantUnionMap &Unions) {
3174 FieldDecl *Field = Init->getAnyMember();
3175 RecordDecl *Parent = Field->getParent();
3176 NamedDecl *Child = Field;
3178 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) {
3179 if (Parent->isUnion()) {
3180 UnionEntry &En = Unions[Parent];
3181 if (En.first && En.first != Child) {
3182 S.Diag(Init->getSourceLocation(),
3183 diag::err_multiple_mem_union_initialization)
3184 << Field->getDeclName()
3185 << Init->getSourceRange();
3186 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer)
3187 << 0 << En.second->getSourceRange();
3194 if (!Parent->isAnonymousStructOrUnion())
3199 Parent = cast<RecordDecl>(Parent->getDeclContext());
3206 /// ActOnMemInitializers - Handle the member initializers for a constructor.
3207 void Sema::ActOnMemInitializers(Decl *ConstructorDecl,
3208 SourceLocation ColonLoc,
3209 CXXCtorInitializer **meminits,
3210 unsigned NumMemInits,
3212 if (!ConstructorDecl)
3215 AdjustDeclIfTemplate(ConstructorDecl);
3217 CXXConstructorDecl *Constructor
3218 = dyn_cast<CXXConstructorDecl>(ConstructorDecl);
3221 Diag(ColonLoc, diag::err_only_constructors_take_base_inits);
3225 CXXCtorInitializer **MemInits =
3226 reinterpret_cast<CXXCtorInitializer **>(meminits);
3228 // Mapping for the duplicate initializers check.
3229 // For member initializers, this is keyed with a FieldDecl*.
3230 // For base initializers, this is keyed with a Type*.
3231 llvm::DenseMap<void*, CXXCtorInitializer *> Members;
3233 // Mapping for the inconsistent anonymous-union initializers check.
3234 RedundantUnionMap MemberUnions;
3236 bool HadError = false;
3237 for (unsigned i = 0; i < NumMemInits; i++) {
3238 CXXCtorInitializer *Init = MemInits[i];
3240 // Set the source order index.
3241 Init->setSourceOrder(i);
3243 if (Init->isAnyMemberInitializer()) {
3244 FieldDecl *Field = Init->getAnyMember();
3245 if (CheckRedundantInit(*this, Init, Members[Field]) ||
3246 CheckRedundantUnionInit(*this, Init, MemberUnions))
3248 } else if (Init->isBaseInitializer()) {
3249 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0));
3250 if (CheckRedundantInit(*this, Init, Members[Key]))
3253 assert(Init->isDelegatingInitializer());
3254 // This must be the only initializer
3255 if (i != 0 || NumMemInits > 1) {
3256 Diag(MemInits[0]->getSourceLocation(),
3257 diag::err_delegating_initializer_alone)
3258 << MemInits[0]->getSourceRange();
3260 // We will treat this as being the only initializer.
3262 SetDelegatingInitializer(Constructor, MemInits[i]);
3263 // Return immediately as the initializer is set.
3271 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits);
3273 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors);
3277 Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location,
3278 CXXRecordDecl *ClassDecl) {
3279 // Ignore dependent contexts. Also ignore unions, since their members never
3280 // have destructors implicitly called.
3281 if (ClassDecl->isDependentContext() || ClassDecl->isUnion())
3284 // FIXME: all the access-control diagnostics are positioned on the
3285 // field/base declaration. That's probably good; that said, the
3286 // user might reasonably want to know why the destructor is being
3287 // emitted, and we currently don't say.
3289 // Non-static data members.
3290 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(),
3291 E = ClassDecl->field_end(); I != E; ++I) {
3292 FieldDecl *Field = *I;
3293 if (Field->isInvalidDecl())
3296 // Don't destroy incomplete or zero-length arrays.
3297 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType()))
3300 QualType FieldType = Context.getBaseElementType(Field->getType());
3302 const RecordType* RT = FieldType->getAs<RecordType>();
3306 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
3307 if (FieldClassDecl->isInvalidDecl())
3309 if (FieldClassDecl->hasIrrelevantDestructor())
3311 // The destructor for an implicit anonymous union member is never invoked.
3312 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion())
3315 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl);
3316 assert(Dtor && "No dtor found for FieldClassDecl!");
3317 CheckDestructorAccess(Field->getLocation(), Dtor,
3318 PDiag(diag::err_access_dtor_field)
3319 << Field->getDeclName()
3322 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor));
3323 DiagnoseUseOfDecl(Dtor, Location);
3326 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases;
3329 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
3330 E = ClassDecl->bases_end(); Base != E; ++Base) {
3331 // Bases are always records in a well-formed non-dependent class.
3332 const RecordType *RT = Base->getType()->getAs<RecordType>();
3334 // Remember direct virtual bases.
3335 if (Base->isVirtual())
3336 DirectVirtualBases.insert(RT);
3338 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
3339 // If our base class is invalid, we probably can't get its dtor anyway.
3340 if (BaseClassDecl->isInvalidDecl())
3342 if (BaseClassDecl->hasIrrelevantDestructor())
3345 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
3346 assert(Dtor && "No dtor found for BaseClassDecl!");
3348 // FIXME: caret should be on the start of the class name
3349 CheckDestructorAccess(Base->getLocStart(), Dtor,
3350 PDiag(diag::err_access_dtor_base)
3352 << Base->getSourceRange(),
3353 Context.getTypeDeclType(ClassDecl));
3355 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor));
3356 DiagnoseUseOfDecl(Dtor, Location);
3360 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(),
3361 E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
3363 // Bases are always records in a well-formed non-dependent class.
3364 const RecordType *RT = VBase->getType()->castAs<RecordType>();
3366 // Ignore direct virtual bases.
3367 if (DirectVirtualBases.count(RT))
3370 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
3371 // If our base class is invalid, we probably can't get its dtor anyway.
3372 if (BaseClassDecl->isInvalidDecl())
3374 if (BaseClassDecl->hasIrrelevantDestructor())
3377 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
3378 assert(Dtor && "No dtor found for BaseClassDecl!");
3379 CheckDestructorAccess(ClassDecl->getLocation(), Dtor,
3380 PDiag(diag::err_access_dtor_vbase)
3381 << VBase->getType(),
3382 Context.getTypeDeclType(ClassDecl));
3384 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor));
3385 DiagnoseUseOfDecl(Dtor, Location);
3389 void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) {
3393 if (CXXConstructorDecl *Constructor
3394 = dyn_cast<CXXConstructorDecl>(CDtorDecl))
3395 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false);
3398 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
3399 unsigned DiagID, AbstractDiagSelID SelID) {
3401 return RequireNonAbstractType(Loc, T, PDiag(DiagID));
3403 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID);
3406 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
3407 const PartialDiagnostic &PD) {
3408 if (!getLangOpts().CPlusPlus)
3411 if (const ArrayType *AT = Context.getAsArrayType(T))
3412 return RequireNonAbstractType(Loc, AT->getElementType(), PD);
3414 if (const PointerType *PT = T->getAs<PointerType>()) {
3415 // Find the innermost pointer type.
3416 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>())
3419 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType()))
3420 return RequireNonAbstractType(Loc, AT->getElementType(), PD);
3423 const RecordType *RT = T->getAs<RecordType>();
3427 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
3429 // We can't answer whether something is abstract until it has a
3430 // definition. If it's currently being defined, we'll walk back
3431 // over all the declarations when we have a full definition.
3432 const CXXRecordDecl *Def = RD->getDefinition();
3433 if (!Def || Def->isBeingDefined())
3436 if (!RD->isAbstract())
3439 Diag(Loc, PD) << RD->getDeclName();
3440 DiagnoseAbstractType(RD);
3445 void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) {
3446 // Check if we've already emitted the list of pure virtual functions
3448 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD))
3451 CXXFinalOverriderMap FinalOverriders;
3452 RD->getFinalOverriders(FinalOverriders);
3454 // Keep a set of seen pure methods so we won't diagnose the same method
3456 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods;
3458 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
3459 MEnd = FinalOverriders.end();
3462 for (OverridingMethods::iterator SO = M->second.begin(),
3463 SOEnd = M->second.end();
3464 SO != SOEnd; ++SO) {
3465 // C++ [class.abstract]p4:
3466 // A class is abstract if it contains or inherits at least one
3467 // pure virtual function for which the final overrider is pure
3471 if (SO->second.size() != 1)
3474 if (!SO->second.front().Method->isPure())
3477 if (!SeenPureMethods.insert(SO->second.front().Method))
3480 Diag(SO->second.front().Method->getLocation(),
3481 diag::note_pure_virtual_function)
3482 << SO->second.front().Method->getDeclName() << RD->getDeclName();
3486 if (!PureVirtualClassDiagSet)
3487 PureVirtualClassDiagSet.reset(new RecordDeclSetTy);
3488 PureVirtualClassDiagSet->insert(RD);
3492 struct AbstractUsageInfo {
3494 CXXRecordDecl *Record;
3495 CanQualType AbstractType;
3498 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record)
3499 : S(S), Record(Record),
3500 AbstractType(S.Context.getCanonicalType(
3501 S.Context.getTypeDeclType(Record))),
3504 void DiagnoseAbstractType() {
3505 if (Invalid) return;
3506 S.DiagnoseAbstractType(Record);
3510 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel);
3513 struct CheckAbstractUsage {
3514 AbstractUsageInfo &Info;
3515 const NamedDecl *Ctx;
3517 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx)
3518 : Info(Info), Ctx(Ctx) {}
3520 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
3521 switch (TL.getTypeLocClass()) {
3522 #define ABSTRACT_TYPELOC(CLASS, PARENT)
3523 #define TYPELOC(CLASS, PARENT) \
3524 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break;
3525 #include "clang/AST/TypeLocNodes.def"
3529 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) {
3530 Visit(TL.getResultLoc(), Sema::AbstractReturnType);
3531 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
3535 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo();
3536 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType);
3540 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) {
3541 Visit(TL.getElementLoc(), Sema::AbstractArrayType);
3544 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) {
3545 // Visit the type parameters from a permissive context.
3546 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
3547 TemplateArgumentLoc TAL = TL.getArgLoc(I);
3548 if (TAL.getArgument().getKind() == TemplateArgument::Type)
3549 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo())
3550 Visit(TSI->getTypeLoc(), Sema::AbstractNone);
3551 // TODO: other template argument types?
3555 // Visit pointee types from a permissive context.
3556 #define CheckPolymorphic(Type) \
3557 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \
3558 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \
3560 CheckPolymorphic(PointerTypeLoc)
3561 CheckPolymorphic(ReferenceTypeLoc)
3562 CheckPolymorphic(MemberPointerTypeLoc)
3563 CheckPolymorphic(BlockPointerTypeLoc)
3564 CheckPolymorphic(AtomicTypeLoc)
3566 /// Handle all the types we haven't given a more specific
3567 /// implementation for above.
3568 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
3569 // Every other kind of type that we haven't called out already
3570 // that has an inner type is either (1) sugar or (2) contains that
3571 // inner type in some way as a subobject.
3572 if (TypeLoc Next = TL.getNextTypeLoc())
3573 return Visit(Next, Sel);
3575 // If there's no inner type and we're in a permissive context,
3577 if (Sel == Sema::AbstractNone) return;
3579 // Check whether the type matches the abstract type.
3580 QualType T = TL.getType();
3581 if (T->isArrayType()) {
3582 Sel = Sema::AbstractArrayType;
3583 T = Info.S.Context.getBaseElementType(T);
3585 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType();
3586 if (CT != Info.AbstractType) return;
3588 // It matched; do some magic.
3589 if (Sel == Sema::AbstractArrayType) {
3590 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type)
3591 << T << TL.getSourceRange();
3593 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl)
3594 << Sel << T << TL.getSourceRange();
3596 Info.DiagnoseAbstractType();
3600 void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL,
3601 Sema::AbstractDiagSelID Sel) {
3602 CheckAbstractUsage(*this, D).Visit(TL, Sel);
3607 /// Check for invalid uses of an abstract type in a method declaration.
3608 static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
3609 CXXMethodDecl *MD) {
3610 // No need to do the check on definitions, which require that
3611 // the return/param types be complete.
3612 if (MD->doesThisDeclarationHaveABody())
3615 // For safety's sake, just ignore it if we don't have type source
3616 // information. This should never happen for non-implicit methods,
3618 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
3619 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone);
3622 /// Check for invalid uses of an abstract type within a class definition.
3623 static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
3624 CXXRecordDecl *RD) {
3625 for (CXXRecordDecl::decl_iterator
3626 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) {
3628 if (D->isImplicit()) continue;
3630 // Methods and method templates.
3631 if (isa<CXXMethodDecl>(D)) {
3632 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D));
3633 } else if (isa<FunctionTemplateDecl>(D)) {
3634 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl();
3635 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD));
3637 // Fields and static variables.
3638 } else if (isa<FieldDecl>(D)) {
3639 FieldDecl *FD = cast<FieldDecl>(D);
3640 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo())
3641 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType);
3642 } else if (isa<VarDecl>(D)) {
3643 VarDecl *VD = cast<VarDecl>(D);
3644 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo())
3645 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType);
3647 // Nested classes and class templates.
3648 } else if (isa<CXXRecordDecl>(D)) {
3649 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D));
3650 } else if (isa<ClassTemplateDecl>(D)) {
3651 CheckAbstractClassUsage(Info,
3652 cast<ClassTemplateDecl>(D)->getTemplatedDecl());
3657 /// \brief Perform semantic checks on a class definition that has been
3658 /// completing, introducing implicitly-declared members, checking for
3659 /// abstract types, etc.
3660 void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) {
3664 if (Record->isAbstract() && !Record->isInvalidDecl()) {
3665 AbstractUsageInfo Info(*this, Record);
3666 CheckAbstractClassUsage(Info, Record);
3669 // If this is not an aggregate type and has no user-declared constructor,
3670 // complain about any non-static data members of reference or const scalar
3671 // type, since they will never get initializers.
3672 if (!Record->isInvalidDecl() && !Record->isDependentType() &&
3673 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() &&
3674 !Record->isLambda()) {
3675 bool Complained = false;
3676 for (RecordDecl::field_iterator F = Record->field_begin(),
3677 FEnd = Record->field_end();
3679 if (F->hasInClassInitializer() || F->isUnnamedBitfield())
3682 if (F->getType()->isReferenceType() ||
3683 (F->getType().isConstQualified() && F->getType()->isScalarType())) {
3685 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst)
3686 << Record->getTagKind() << Record;
3690 Diag(F->getLocation(), diag::note_refconst_member_not_initialized)
3691 << F->getType()->isReferenceType()
3692 << F->getDeclName();
3697 if (Record->isDynamicClass() && !Record->isDependentType())
3698 DynamicClasses.push_back(Record);
3700 if (Record->getIdentifier()) {
3701 // C++ [class.mem]p13:
3702 // If T is the name of a class, then each of the following shall have a
3703 // name different from T:
3704 // - every member of every anonymous union that is a member of class T.
3706 // C++ [class.mem]p14:
3707 // In addition, if class T has a user-declared constructor (12.1), every
3708 // non-static data member of class T shall have a name different from T.
3709 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName());
3710 R.first != R.second; ++R.first) {
3711 NamedDecl *D = *R.first;
3712 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) ||
3713 isa<IndirectFieldDecl>(D)) {
3714 Diag(D->getLocation(), diag::err_member_name_of_class)
3715 << D->getDeclName();
3721 // Warn if the class has virtual methods but non-virtual public destructor.
3722 if (Record->isPolymorphic() && !Record->isDependentType()) {
3723 CXXDestructorDecl *dtor = Record->getDestructor();
3724 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public))
3725 Diag(dtor ? dtor->getLocation() : Record->getLocation(),
3726 diag::warn_non_virtual_dtor) << Context.getRecordType(Record);
3729 // See if a method overloads virtual methods in a base
3730 /// class without overriding any.
3731 if (!Record->isDependentType()) {
3732 for (CXXRecordDecl::method_iterator M = Record->method_begin(),
3733 MEnd = Record->method_end();
3735 if (!(*M)->isStatic())
3736 DiagnoseHiddenVirtualMethods(Record, *M);
3740 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member
3741 // function that is not a constructor declares that member function to be
3742 // const. [...] The class of which that function is a member shall be
3745 // If the class has virtual bases, any constexpr members will already have
3746 // been diagnosed by the checks performed on the member declaration, so
3747 // suppress this (less useful) diagnostic.
3748 if (LangOpts.CPlusPlus0x && !Record->isDependentType() &&
3749 !Record->isLiteral() && !Record->getNumVBases()) {
3750 for (CXXRecordDecl::method_iterator M = Record->method_begin(),
3751 MEnd = Record->method_end();
3753 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) {
3754 switch (Record->getTemplateSpecializationKind()) {
3755 case TSK_ImplicitInstantiation:
3756 case TSK_ExplicitInstantiationDeclaration:
3757 case TSK_ExplicitInstantiationDefinition:
3758 // If a template instantiates to a non-literal type, but its members
3759 // instantiate to constexpr functions, the template is technically
3760 // ill-formed, but we allow it for sanity.
3763 case TSK_Undeclared:
3764 case TSK_ExplicitSpecialization:
3765 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record),
3766 PDiag(diag::err_constexpr_method_non_literal));
3770 // Only produce one error per class.
3776 // Declare inherited constructors. We do this eagerly here because:
3777 // - The standard requires an eager diagnostic for conflicting inherited
3778 // constructors from different classes.
3779 // - The lazy declaration of the other implicit constructors is so as to not
3780 // waste space and performance on classes that are not meant to be
3781 // instantiated (e.g. meta-functions). This doesn't apply to classes that
3782 // have inherited constructors.
3783 DeclareInheritedConstructors(Record);
3785 if (!Record->isDependentType())
3786 CheckExplicitlyDefaultedMethods(Record);
3789 void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) {
3790 for (CXXRecordDecl::method_iterator MI = Record->method_begin(),
3791 ME = Record->method_end();
3793 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) {
3794 switch (getSpecialMember(*MI)) {
3795 case CXXDefaultConstructor:
3796 CheckExplicitlyDefaultedDefaultConstructor(
3797 cast<CXXConstructorDecl>(*MI));
3801 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI));
3804 case CXXCopyConstructor:
3805 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI));
3808 case CXXCopyAssignment:
3809 CheckExplicitlyDefaultedCopyAssignment(*MI);
3812 case CXXMoveConstructor:
3813 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI));
3816 case CXXMoveAssignment:
3817 CheckExplicitlyDefaultedMoveAssignment(*MI);
3821 llvm_unreachable("non-special member explicitly defaulted!");
3828 void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) {
3829 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor());
3831 // Whether this was the first-declared instance of the constructor.
3832 // This affects whether we implicitly add an exception spec (and, eventually,
3833 // constexpr). It is also ill-formed to explicitly default a constructor such
3834 // that it would be deleted. (C++0x [decl.fct.def.default])
3835 bool First = CD == CD->getCanonicalDecl();
3837 bool HadError = false;
3838 if (CD->getNumParams() != 0) {
3839 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params)
3840 << CD->getSourceRange();
3844 ImplicitExceptionSpecification Spec
3845 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent());
3846 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
3847 if (EPI.ExceptionSpecType == EST_Delayed) {
3848 // Exception specification depends on some deferred part of the class. We'll
3849 // try again when the class's definition has been fully processed.
3852 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(),
3853 *ExceptionType = Context.getFunctionType(
3854 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>();
3856 // C++11 [dcl.fct.def.default]p2:
3857 // An explicitly-defaulted function may be declared constexpr only if it
3858 // would have been implicitly declared as constexpr,
3859 // Do not apply this rule to templates, since core issue 1358 makes such
3860 // functions always instantiate to constexpr functions.
3861 if (CD->isConstexpr() &&
3862 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) {
3863 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) {
3864 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr)
3865 << CXXDefaultConstructor;
3869 // and may have an explicit exception-specification only if it is compatible
3870 // with the exception-specification on the implicit declaration.
3871 if (CtorType->hasExceptionSpec()) {
3872 if (CheckEquivalentExceptionSpec(
3873 PDiag(diag::err_incorrect_defaulted_exception_spec)
3874 << CXXDefaultConstructor,
3876 ExceptionType, SourceLocation(),
3877 CtorType, CD->getLocation())) {
3882 // If a function is explicitly defaulted on its first declaration,
3884 // -- it is implicitly considered to be constexpr if the implicit
3885 // definition would be,
3886 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr());
3888 // -- it is implicitly considered to have the same
3889 // exception-specification as if it had been implicitly declared
3891 // FIXME: a compatible, but different, explicit exception specification
3892 // will be silently overridden. We should issue a warning if this happens.
3893 EPI.ExtInfo = CtorType->getExtInfo();
3895 // Such a function is also trivial if the implicitly-declared function
3897 CD->setTrivial(CD->getParent()->hasTrivialDefaultConstructor());
3901 CD->setInvalidDecl();
3905 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) {
3907 CD->setDeletedAsWritten();
3909 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes)
3910 << CXXDefaultConstructor;
3911 CD->setInvalidDecl();
3916 void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) {
3917 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor());
3919 // Whether this was the first-declared instance of the constructor.
3920 bool First = CD == CD->getCanonicalDecl();
3922 bool HadError = false;
3923 if (CD->getNumParams() != 1) {
3924 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params)
3925 << CD->getSourceRange();
3929 ImplicitExceptionSpecification Spec(*this);
3931 llvm::tie(Spec, Const) =
3932 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent());
3934 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
3935 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(),
3936 *ExceptionType = Context.getFunctionType(
3937 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>();
3939 // Check for parameter type matching.
3940 // This is a copy ctor so we know it's a cv-qualified reference to T.
3941 QualType ArgType = CtorType->getArgType(0);
3942 if (ArgType->getPointeeType().isVolatileQualified()) {
3943 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param);
3946 if (ArgType->getPointeeType().isConstQualified() && !Const) {
3947 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param);
3951 // C++11 [dcl.fct.def.default]p2:
3952 // An explicitly-defaulted function may be declared constexpr only if it
3953 // would have been implicitly declared as constexpr,
3954 // Do not apply this rule to templates, since core issue 1358 makes such
3955 // functions always instantiate to constexpr functions.
3956 if (CD->isConstexpr() &&
3957 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) {
3958 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) {
3959 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr)
3960 << CXXCopyConstructor;
3964 // and may have an explicit exception-specification only if it is compatible
3965 // with the exception-specification on the implicit declaration.
3966 if (CtorType->hasExceptionSpec()) {
3967 if (CheckEquivalentExceptionSpec(
3968 PDiag(diag::err_incorrect_defaulted_exception_spec)
3969 << CXXCopyConstructor,
3971 ExceptionType, SourceLocation(),
3972 CtorType, CD->getLocation())) {
3977 // If a function is explicitly defaulted on its first declaration,
3979 // -- it is implicitly considered to be constexpr if the implicit
3980 // definition would be,
3981 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr());
3983 // -- it is implicitly considered to have the same
3984 // exception-specification as if it had been implicitly declared, and
3986 // FIXME: a compatible, but different, explicit exception specification
3987 // will be silently overridden. We should issue a warning if this happens.
3988 EPI.ExtInfo = CtorType->getExtInfo();
3990 // -- [...] it shall have the same parameter type as if it had been
3991 // implicitly declared.
3992 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI));
3994 // Such a function is also trivial if the implicitly-declared function
3996 CD->setTrivial(CD->getParent()->hasTrivialCopyConstructor());
4000 CD->setInvalidDecl();
4004 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) {
4006 CD->setDeletedAsWritten();
4008 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes)
4009 << CXXCopyConstructor;
4010 CD->setInvalidDecl();
4015 void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) {
4016 assert(MD->isExplicitlyDefaulted());
4018 // Whether this was the first-declared instance of the operator
4019 bool First = MD == MD->getCanonicalDecl();
4021 bool HadError = false;
4022 if (MD->getNumParams() != 1) {
4023 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params)
4024 << MD->getSourceRange();
4028 QualType ReturnType =
4029 MD->getType()->getAs<FunctionType>()->getResultType();
4030 if (!ReturnType->isLValueReferenceType() ||
4031 !Context.hasSameType(
4032 Context.getCanonicalType(ReturnType->getPointeeType()),
4033 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) {
4034 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type);
4038 ImplicitExceptionSpecification Spec(*this);
4040 llvm::tie(Spec, Const) =
4041 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent());
4043 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
4044 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(),
4045 *ExceptionType = Context.getFunctionType(
4046 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>();
4048 QualType ArgType = OperType->getArgType(0);
4049 if (!ArgType->isLValueReferenceType()) {
4050 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref);
4053 if (ArgType->getPointeeType().isVolatileQualified()) {
4054 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param);
4057 if (ArgType->getPointeeType().isConstQualified() && !Const) {
4058 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param);
4063 if (OperType->getTypeQuals()) {
4064 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals);
4068 if (OperType->hasExceptionSpec()) {
4069 if (CheckEquivalentExceptionSpec(
4070 PDiag(diag::err_incorrect_defaulted_exception_spec)
4071 << CXXCopyAssignment,
4073 ExceptionType, SourceLocation(),
4074 OperType, MD->getLocation())) {
4079 // We set the declaration to have the computed exception spec here.
4080 // We duplicate the one parameter type.
4081 EPI.RefQualifier = OperType->getRefQualifier();
4082 EPI.ExtInfo = OperType->getExtInfo();
4083 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI));
4085 // Such a function is also trivial if the implicitly-declared function
4087 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment());
4091 MD->setInvalidDecl();
4095 if (ShouldDeleteSpecialMember(MD, CXXCopyAssignment)) {
4097 MD->setDeletedAsWritten();
4099 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes)
4100 << CXXCopyAssignment;
4101 MD->setInvalidDecl();
4106 void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) {
4107 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor());
4109 // Whether this was the first-declared instance of the constructor.
4110 bool First = CD == CD->getCanonicalDecl();
4112 bool HadError = false;
4113 if (CD->getNumParams() != 1) {
4114 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params)
4115 << CD->getSourceRange();
4119 ImplicitExceptionSpecification Spec(
4120 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent()));
4122 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
4123 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(),
4124 *ExceptionType = Context.getFunctionType(
4125 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>();
4127 // Check for parameter type matching.
4128 // This is a move ctor so we know it's a cv-qualified rvalue reference to T.
4129 QualType ArgType = CtorType->getArgType(0);
4130 if (ArgType->getPointeeType().isVolatileQualified()) {
4131 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param);
4134 if (ArgType->getPointeeType().isConstQualified()) {
4135 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param);
4139 // C++11 [dcl.fct.def.default]p2:
4140 // An explicitly-defaulted function may be declared constexpr only if it
4141 // would have been implicitly declared as constexpr,
4142 // Do not apply this rule to templates, since core issue 1358 makes such
4143 // functions always instantiate to constexpr functions.
4144 if (CD->isConstexpr() &&
4145 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) {
4146 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) {
4147 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr)
4148 << CXXMoveConstructor;
4152 // and may have an explicit exception-specification only if it is compatible
4153 // with the exception-specification on the implicit declaration.
4154 if (CtorType->hasExceptionSpec()) {
4155 if (CheckEquivalentExceptionSpec(
4156 PDiag(diag::err_incorrect_defaulted_exception_spec)
4157 << CXXMoveConstructor,
4159 ExceptionType, SourceLocation(),
4160 CtorType, CD->getLocation())) {
4165 // If a function is explicitly defaulted on its first declaration,
4167 // -- it is implicitly considered to be constexpr if the implicit
4168 // definition would be,
4169 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr());
4171 // -- it is implicitly considered to have the same
4172 // exception-specification as if it had been implicitly declared, and
4174 // FIXME: a compatible, but different, explicit exception specification
4175 // will be silently overridden. We should issue a warning if this happens.
4176 EPI.ExtInfo = CtorType->getExtInfo();
4178 // -- [...] it shall have the same parameter type as if it had been
4179 // implicitly declared.
4180 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI));
4182 // Such a function is also trivial if the implicitly-declared function
4184 CD->setTrivial(CD->getParent()->hasTrivialMoveConstructor());
4188 CD->setInvalidDecl();
4192 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) {
4194 CD->setDeletedAsWritten();
4196 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes)
4197 << CXXMoveConstructor;
4198 CD->setInvalidDecl();
4203 void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) {
4204 assert(MD->isExplicitlyDefaulted());
4206 // Whether this was the first-declared instance of the operator
4207 bool First = MD == MD->getCanonicalDecl();
4209 bool HadError = false;
4210 if (MD->getNumParams() != 1) {
4211 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params)
4212 << MD->getSourceRange();
4216 QualType ReturnType =
4217 MD->getType()->getAs<FunctionType>()->getResultType();
4218 if (!ReturnType->isLValueReferenceType() ||
4219 !Context.hasSameType(
4220 Context.getCanonicalType(ReturnType->getPointeeType()),
4221 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) {
4222 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type);
4226 ImplicitExceptionSpecification Spec(
4227 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent()));
4229 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
4230 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(),
4231 *ExceptionType = Context.getFunctionType(
4232 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>();
4234 QualType ArgType = OperType->getArgType(0);
4235 if (!ArgType->isRValueReferenceType()) {
4236 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref);
4239 if (ArgType->getPointeeType().isVolatileQualified()) {
4240 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param);
4243 if (ArgType->getPointeeType().isConstQualified()) {
4244 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param);
4249 if (OperType->getTypeQuals()) {
4250 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals);
4254 if (OperType->hasExceptionSpec()) {
4255 if (CheckEquivalentExceptionSpec(
4256 PDiag(diag::err_incorrect_defaulted_exception_spec)
4257 << CXXMoveAssignment,
4259 ExceptionType, SourceLocation(),
4260 OperType, MD->getLocation())) {
4265 // We set the declaration to have the computed exception spec here.
4266 // We duplicate the one parameter type.
4267 EPI.RefQualifier = OperType->getRefQualifier();
4268 EPI.ExtInfo = OperType->getExtInfo();
4269 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI));
4271 // Such a function is also trivial if the implicitly-declared function
4273 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment());
4277 MD->setInvalidDecl();
4281 if (ShouldDeleteSpecialMember(MD, CXXMoveAssignment)) {
4283 MD->setDeletedAsWritten();
4285 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes)
4286 << CXXMoveAssignment;
4287 MD->setInvalidDecl();
4292 void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) {
4293 assert(DD->isExplicitlyDefaulted());
4295 // Whether this was the first-declared instance of the destructor.
4296 bool First = DD == DD->getCanonicalDecl();
4298 ImplicitExceptionSpecification Spec
4299 = ComputeDefaultedDtorExceptionSpec(DD->getParent());
4300 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
4301 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(),
4302 *ExceptionType = Context.getFunctionType(
4303 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>();
4305 if (DtorType->hasExceptionSpec()) {
4306 if (CheckEquivalentExceptionSpec(
4307 PDiag(diag::err_incorrect_defaulted_exception_spec)
4310 ExceptionType, SourceLocation(),
4311 DtorType, DD->getLocation())) {
4312 DD->setInvalidDecl();
4317 // We set the declaration to have the computed exception spec here.
4318 // There are no parameters.
4319 EPI.ExtInfo = DtorType->getExtInfo();
4320 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI));
4322 // Such a function is also trivial if the implicitly-declared function
4324 DD->setTrivial(DD->getParent()->hasTrivialDestructor());
4327 if (ShouldDeleteSpecialMember(DD, CXXDestructor)) {
4329 DD->setDeletedAsWritten();
4331 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes)
4333 DD->setInvalidDecl();
4339 struct SpecialMemberDeletionInfo {
4342 Sema::CXXSpecialMember CSM;
4345 // Properties of the special member, computed for convenience.
4346 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg;
4349 bool AllFieldsAreConst;
4351 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD,
4352 Sema::CXXSpecialMember CSM, bool Diagnose)
4353 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose),
4354 IsConstructor(false), IsAssignment(false), IsMove(false),
4355 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()),
4356 AllFieldsAreConst(true) {
4358 case Sema::CXXDefaultConstructor:
4359 case Sema::CXXCopyConstructor:
4360 IsConstructor = true;
4362 case Sema::CXXMoveConstructor:
4363 IsConstructor = true;
4366 case Sema::CXXCopyAssignment:
4367 IsAssignment = true;
4369 case Sema::CXXMoveAssignment:
4370 IsAssignment = true;
4373 case Sema::CXXDestructor:
4375 case Sema::CXXInvalid:
4376 llvm_unreachable("invalid special member kind");
4379 if (MD->getNumParams()) {
4380 ConstArg = MD->getParamDecl(0)->getType().isConstQualified();
4381 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified();
4385 bool inUnion() const { return MD->getParent()->isUnion(); }
4387 /// Look up the corresponding special member in the given class.
4388 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) {
4389 unsigned TQ = MD->getTypeQualifiers();
4390 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg,
4391 MD->getRefQualifier() == RQ_RValue,
4392 TQ & Qualifiers::Const,
4393 TQ & Qualifiers::Volatile);
4396 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject;
4398 bool shouldDeleteForBase(CXXBaseSpecifier *Base);
4399 bool shouldDeleteForField(FieldDecl *FD);
4400 bool shouldDeleteForAllConstMembers();
4402 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj);
4403 bool shouldDeleteForSubobjectCall(Subobject Subobj,
4404 Sema::SpecialMemberOverloadResult *SMOR,
4405 bool IsDtorCallInCtor);
4407 bool isAccessible(Subobject Subobj, CXXMethodDecl *D);
4411 /// Is the given special member inaccessible when used on the given
4413 bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj,
4414 CXXMethodDecl *target) {
4415 /// If we're operating on a base class, the object type is the
4416 /// type of this special member.
4418 AccessSpecifier access = target->getAccess();;
4419 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) {
4420 objectTy = S.Context.getTypeDeclType(MD->getParent());
4421 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access);
4423 // If we're operating on a field, the object type is the type of the field.
4425 objectTy = S.Context.getTypeDeclType(target->getParent());
4428 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy);
4431 /// Check whether we should delete a special member due to the implicit
4432 /// definition containing a call to a special member of a subobject.
4433 bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall(
4434 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR,
4435 bool IsDtorCallInCtor) {
4436 CXXMethodDecl *Decl = SMOR->getMethod();
4437 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
4441 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)
4442 DiagKind = !Decl ? 0 : 1;
4443 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
4445 else if (!isAccessible(Subobj, Decl))
4447 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() &&
4448 !Decl->isTrivial()) {
4449 // A member of a union must have a trivial corresponding special member.
4450 // As a weird special case, a destructor call from a union's constructor
4451 // must be accessible and non-deleted, but need not be trivial. Such a
4452 // destructor is never actually called, but is semantically checked as
4462 S.Diag(Field->getLocation(),
4463 diag::note_deleted_special_member_class_subobject)
4464 << CSM << MD->getParent() << /*IsField*/true
4465 << Field << DiagKind << IsDtorCallInCtor;
4467 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>();
4468 S.Diag(Base->getLocStart(),
4469 diag::note_deleted_special_member_class_subobject)
4470 << CSM << MD->getParent() << /*IsField*/false
4471 << Base->getType() << DiagKind << IsDtorCallInCtor;
4475 S.NoteDeletedFunction(Decl);
4476 // FIXME: Explain inaccessibility if DiagKind == 3.
4482 /// Check whether we should delete a special member function due to having a
4483 /// direct or virtual base class or static data member of class type M.
4484 bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject(
4485 CXXRecordDecl *Class, Subobject Subobj) {
4486 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
4488 // C++11 [class.ctor]p5:
4489 // -- any direct or virtual base class, or non-static data member with no
4490 // brace-or-equal-initializer, has class type M (or array thereof) and
4491 // either M has no default constructor or overload resolution as applied
4492 // to M's default constructor results in an ambiguity or in a function
4493 // that is deleted or inaccessible
4494 // C++11 [class.copy]p11, C++11 [class.copy]p23:
4495 // -- a direct or virtual base class B that cannot be copied/moved because
4496 // overload resolution, as applied to B's corresponding special member,
4497 // results in an ambiguity or a function that is deleted or inaccessible
4498 // from the defaulted special member
4499 // C++11 [class.dtor]p5:
4500 // -- any direct or virtual base class [...] has a type with a destructor
4501 // that is deleted or inaccessible
4502 if (!(CSM == Sema::CXXDefaultConstructor &&
4503 Field && Field->hasInClassInitializer()) &&
4504 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class), false))
4507 // C++11 [class.ctor]p5, C++11 [class.copy]p11:
4508 // -- any direct or virtual base class or non-static data member has a
4509 // type with a destructor that is deleted or inaccessible
4510 if (IsConstructor) {
4511 Sema::SpecialMemberOverloadResult *SMOR =
4512 S.LookupSpecialMember(Class, Sema::CXXDestructor,
4513 false, false, false, false, false);
4514 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true))
4521 /// Check whether we should delete a special member function due to the class
4522 /// having a particular direct or virtual base class.
4523 bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) {
4524 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl();
4525 return shouldDeleteForClassSubobject(BaseClass, Base);
4528 /// Check whether we should delete a special member function due to the class
4529 /// having a particular non-static data member.
4530 bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) {
4531 QualType FieldType = S.Context.getBaseElementType(FD->getType());
4532 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl();
4534 if (CSM == Sema::CXXDefaultConstructor) {
4535 // For a default constructor, all references must be initialized in-class
4536 // and, if a union, it must have a non-const member.
4537 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) {
4539 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
4540 << MD->getParent() << FD << FieldType << /*Reference*/0;
4543 // C++11 [class.ctor]p5: any non-variant non-static data member of
4544 // const-qualified type (or array thereof) with no
4545 // brace-or-equal-initializer does not have a user-provided default
4547 if (!inUnion() && FieldType.isConstQualified() &&
4548 !FD->hasInClassInitializer() &&
4549 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) {
4551 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
4552 << MD->getParent() << FD << FieldType << /*Const*/1;
4556 if (inUnion() && !FieldType.isConstQualified())
4557 AllFieldsAreConst = false;
4558 } else if (CSM == Sema::CXXCopyConstructor) {
4559 // For a copy constructor, data members must not be of rvalue reference
4561 if (FieldType->isRValueReferenceType()) {
4563 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference)
4564 << MD->getParent() << FD << FieldType;
4567 } else if (IsAssignment) {
4568 // For an assignment operator, data members must not be of reference type.
4569 if (FieldType->isReferenceType()) {
4571 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
4572 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0;
4575 if (!FieldRecord && FieldType.isConstQualified()) {
4576 // C++11 [class.copy]p23:
4577 // -- a non-static data member of const non-class type (or array thereof)
4579 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
4580 << IsMove << MD->getParent() << FD << FieldType << /*Const*/1;
4586 // Some additional restrictions exist on the variant members.
4587 if (!inUnion() && FieldRecord->isUnion() &&
4588 FieldRecord->isAnonymousStructOrUnion()) {
4589 bool AllVariantFieldsAreConst = true;
4591 // FIXME: Handle anonymous unions declared within anonymous unions.
4592 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(),
4593 UE = FieldRecord->field_end();
4595 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType());
4597 if (!UnionFieldType.isConstQualified())
4598 AllVariantFieldsAreConst = false;
4600 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl();
4601 if (UnionFieldRecord &&
4602 shouldDeleteForClassSubobject(UnionFieldRecord, *UI))
4606 // At least one member in each anonymous union must be non-const
4607 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst &&
4608 FieldRecord->field_begin() != FieldRecord->field_end()) {
4610 S.Diag(FieldRecord->getLocation(),
4611 diag::note_deleted_default_ctor_all_const)
4612 << MD->getParent() << /*anonymous union*/1;
4616 // Don't check the implicit member of the anonymous union type.
4617 // This is technically non-conformant, but sanity demands it.
4621 if (shouldDeleteForClassSubobject(FieldRecord, FD))
4628 /// C++11 [class.ctor] p5:
4629 /// A defaulted default constructor for a class X is defined as deleted if
4630 /// X is a union and all of its variant members are of const-qualified type.
4631 bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() {
4632 // This is a silly definition, because it gives an empty union a deleted
4633 // default constructor. Don't do that.
4634 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst &&
4635 (MD->getParent()->field_begin() != MD->getParent()->field_end())) {
4637 S.Diag(MD->getParent()->getLocation(),
4638 diag::note_deleted_default_ctor_all_const)
4639 << MD->getParent() << /*not anonymous union*/0;
4645 /// Determine whether a defaulted special member function should be defined as
4646 /// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11,
4647 /// C++11 [class.copy]p23, and C++11 [class.dtor]p5.
4648 bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM,
4650 assert(!MD->isInvalidDecl());
4651 CXXRecordDecl *RD = MD->getParent();
4652 assert(!RD->isDependentType() && "do deletion after instantiation");
4653 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl())
4656 // C++11 [expr.lambda.prim]p19:
4657 // The closure type associated with a lambda-expression has a
4658 // deleted (8.4.3) default constructor and a deleted copy
4659 // assignment operator.
4660 if (RD->isLambda() &&
4661 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) {
4663 Diag(RD->getLocation(), diag::note_lambda_decl);
4667 // For an anonymous struct or union, the copy and assignment special members
4668 // will never be used, so skip the check. For an anonymous union declared at
4669 // namespace scope, the constructor and destructor are used.
4670 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor &&
4671 RD->isAnonymousStructOrUnion())
4674 // C++11 [class.copy]p7, p18:
4675 // If the class definition declares a move constructor or move assignment
4676 // operator, an implicitly declared copy constructor or copy assignment
4677 // operator is defined as deleted.
4678 if (MD->isImplicit() &&
4679 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) {
4680 CXXMethodDecl *UserDeclaredMove = 0;
4682 // In Microsoft mode, a user-declared move only causes the deletion of the
4683 // corresponding copy operation, not both copy operations.
4684 if (RD->hasUserDeclaredMoveConstructor() &&
4685 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) {
4686 if (!Diagnose) return true;
4687 UserDeclaredMove = RD->getMoveConstructor();
4688 assert(UserDeclaredMove);
4689 } else if (RD->hasUserDeclaredMoveAssignment() &&
4690 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) {
4691 if (!Diagnose) return true;
4692 UserDeclaredMove = RD->getMoveAssignmentOperator();
4693 assert(UserDeclaredMove);
4696 if (UserDeclaredMove) {
4697 Diag(UserDeclaredMove->getLocation(),
4698 diag::note_deleted_copy_user_declared_move)
4699 << (CSM == CXXCopyAssignment) << RD
4700 << UserDeclaredMove->isMoveAssignmentOperator();
4705 // Do access control from the special member function
4706 ContextRAII MethodContext(*this, MD);
4708 // C++11 [class.dtor]p5:
4709 // -- for a virtual destructor, lookup of the non-array deallocation function
4710 // results in an ambiguity or in a function that is deleted or inaccessible
4711 if (CSM == CXXDestructor && MD->isVirtual()) {
4712 FunctionDecl *OperatorDelete = 0;
4713 DeclarationName Name =
4714 Context.DeclarationNames.getCXXOperatorName(OO_Delete);
4715 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name,
4716 OperatorDelete, false)) {
4718 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete);
4723 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose);
4725 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(),
4726 BE = RD->bases_end(); BI != BE; ++BI)
4727 if (!BI->isVirtual() &&
4728 SMI.shouldDeleteForBase(BI))
4731 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(),
4732 BE = RD->vbases_end(); BI != BE; ++BI)
4733 if (SMI.shouldDeleteForBase(BI))
4736 for (CXXRecordDecl::field_iterator FI = RD->field_begin(),
4737 FE = RD->field_end(); FI != FE; ++FI)
4738 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() &&
4739 SMI.shouldDeleteForField(*FI))
4742 if (SMI.shouldDeleteForAllConstMembers())
4748 /// \brief Data used with FindHiddenVirtualMethod
4750 struct FindHiddenVirtualMethodData {
4752 CXXMethodDecl *Method;
4753 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods;
4754 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
4758 /// \brief Member lookup function that determines whether a given C++
4759 /// method overloads virtual methods in a base class without overriding any,
4760 /// to be used with CXXRecordDecl::lookupInBases().
4761 static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier,
4764 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
4766 FindHiddenVirtualMethodData &Data
4767 = *static_cast<FindHiddenVirtualMethodData*>(UserData);
4769 DeclarationName Name = Data.Method->getDeclName();
4770 assert(Name.getNameKind() == DeclarationName::Identifier);
4772 bool foundSameNameMethod = false;
4773 SmallVector<CXXMethodDecl *, 8> overloadedMethods;
4774 for (Path.Decls = BaseRecord->lookup(Name);
4775 Path.Decls.first != Path.Decls.second;
4776 ++Path.Decls.first) {
4777 NamedDecl *D = *Path.Decls.first;
4778 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
4779 MD = MD->getCanonicalDecl();
4780 foundSameNameMethod = true;
4781 // Interested only in hidden virtual methods.
4782 if (!MD->isVirtual())
4784 // If the method we are checking overrides a method from its base
4785 // don't warn about the other overloaded methods.
4786 if (!Data.S->IsOverload(Data.Method, MD, false))
4788 // Collect the overload only if its hidden.
4789 if (!Data.OverridenAndUsingBaseMethods.count(MD))
4790 overloadedMethods.push_back(MD);
4794 if (foundSameNameMethod)
4795 Data.OverloadedMethods.append(overloadedMethods.begin(),
4796 overloadedMethods.end());
4797 return foundSameNameMethod;
4800 /// \brief See if a method overloads virtual methods in a base class without
4802 void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
4803 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual,
4804 MD->getLocation()) == DiagnosticsEngine::Ignored)
4806 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier)
4809 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases.
4810 /*bool RecordPaths=*/false,
4811 /*bool DetectVirtual=*/false);
4812 FindHiddenVirtualMethodData Data;
4816 // Keep the base methods that were overriden or introduced in the subclass
4817 // by 'using' in a set. A base method not in this set is hidden.
4818 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName());
4819 res.first != res.second; ++res.first) {
4820 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first))
4821 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
4822 E = MD->end_overridden_methods();
4824 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl());
4825 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first))
4826 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl()))
4827 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl());
4830 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) &&
4831 !Data.OverloadedMethods.empty()) {
4832 Diag(MD->getLocation(), diag::warn_overloaded_virtual)
4833 << MD << (Data.OverloadedMethods.size() > 1);
4835 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) {
4836 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i];
4837 Diag(overloadedMD->getLocation(),
4838 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD;
4843 void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
4845 SourceLocation LBrac,
4846 SourceLocation RBrac,
4847 AttributeList *AttrList) {
4851 AdjustDeclIfTemplate(TagDecl);
4853 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef(
4854 // strict aliasing violation!
4855 reinterpret_cast<Decl**>(FieldCollector->getCurFields()),
4856 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList);
4858 CheckCompletedCXXClass(
4859 dyn_cast_or_null<CXXRecordDecl>(TagDecl));
4862 /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
4863 /// special functions, such as the default constructor, copy
4864 /// constructor, or destructor, to the given C++ class (C++
4865 /// [special]p1). This routine can only be executed just before the
4866 /// definition of the class is complete.
4867 void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
4868 if (!ClassDecl->hasUserDeclaredConstructor())
4869 ++ASTContext::NumImplicitDefaultConstructors;
4871 if (!ClassDecl->hasUserDeclaredCopyConstructor())
4872 ++ASTContext::NumImplicitCopyConstructors;
4874 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor())
4875 ++ASTContext::NumImplicitMoveConstructors;
4877 if (!ClassDecl->hasUserDeclaredCopyAssignment()) {
4878 ++ASTContext::NumImplicitCopyAssignmentOperators;
4880 // If we have a dynamic class, then the copy assignment operator may be
4881 // virtual, so we have to declare it immediately. This ensures that, e.g.,
4882 // it shows up in the right place in the vtable and that we diagnose
4883 // problems with the implicit exception specification.
4884 if (ClassDecl->isDynamicClass())
4885 DeclareImplicitCopyAssignment(ClassDecl);
4888 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) {
4889 ++ASTContext::NumImplicitMoveAssignmentOperators;
4891 // Likewise for the move assignment operator.
4892 if (ClassDecl->isDynamicClass())
4893 DeclareImplicitMoveAssignment(ClassDecl);
4896 if (!ClassDecl->hasUserDeclaredDestructor()) {
4897 ++ASTContext::NumImplicitDestructors;
4899 // If we have a dynamic class, then the destructor may be virtual, so we
4900 // have to declare the destructor immediately. This ensures that, e.g., it
4901 // shows up in the right place in the vtable and that we diagnose problems
4902 // with the implicit exception specification.
4903 if (ClassDecl->isDynamicClass())
4904 DeclareImplicitDestructor(ClassDecl);
4908 void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) {
4912 int NumParamList = D->getNumTemplateParameterLists();
4913 for (int i = 0; i < NumParamList; i++) {
4914 TemplateParameterList* Params = D->getTemplateParameterList(i);
4915 for (TemplateParameterList::iterator Param = Params->begin(),
4916 ParamEnd = Params->end();
4917 Param != ParamEnd; ++Param) {
4918 NamedDecl *Named = cast<NamedDecl>(*Param);
4919 if (Named->getDeclName()) {
4921 IdResolver.AddDecl(Named);
4927 void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) {
4931 TemplateParameterList *Params = 0;
4932 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D))
4933 Params = Template->getTemplateParameters();
4934 else if (ClassTemplatePartialSpecializationDecl *PartialSpec
4935 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
4936 Params = PartialSpec->getTemplateParameters();
4940 for (TemplateParameterList::iterator Param = Params->begin(),
4941 ParamEnd = Params->end();
4942 Param != ParamEnd; ++Param) {
4943 NamedDecl *Named = cast<NamedDecl>(*Param);
4944 if (Named->getDeclName()) {
4946 IdResolver.AddDecl(Named);
4951 void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
4952 if (!RecordD) return;
4953 AdjustDeclIfTemplate(RecordD);
4954 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD);
4955 PushDeclContext(S, Record);
4958 void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
4959 if (!RecordD) return;
4963 /// ActOnStartDelayedCXXMethodDeclaration - We have completed
4964 /// parsing a top-level (non-nested) C++ class, and we are now
4965 /// parsing those parts of the given Method declaration that could
4966 /// not be parsed earlier (C++ [class.mem]p2), such as default
4967 /// arguments. This action should enter the scope of the given
4968 /// Method declaration as if we had just parsed the qualified method
4969 /// name. However, it should not bring the parameters into scope;
4970 /// that will be performed by ActOnDelayedCXXMethodParameter.
4971 void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
4974 /// ActOnDelayedCXXMethodParameter - We've already started a delayed
4975 /// C++ method declaration. We're (re-)introducing the given
4976 /// function parameter into scope for use in parsing later parts of
4977 /// the method declaration. For example, we could see an
4978 /// ActOnParamDefaultArgument event for this parameter.
4979 void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) {
4983 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD);
4985 // If this parameter has an unparsed default argument, clear it out
4986 // to make way for the parsed default argument.
4987 if (Param->hasUnparsedDefaultArg())
4988 Param->setDefaultArg(0);
4991 if (Param->getDeclName())
4992 IdResolver.AddDecl(Param);
4995 /// ActOnFinishDelayedCXXMethodDeclaration - We have finished
4996 /// processing the delayed method declaration for Method. The method
4997 /// declaration is now considered finished. There may be a separate
4998 /// ActOnStartOfFunctionDef action later (not necessarily
4999 /// immediately!) for this method, if it was also defined inside the
5001 void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
5005 AdjustDeclIfTemplate(MethodD);
5007 FunctionDecl *Method = cast<FunctionDecl>(MethodD);
5009 // Now that we have our default arguments, check the constructor
5010 // again. It could produce additional diagnostics or affect whether
5011 // the class has implicitly-declared destructors, among other
5013 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method))
5014 CheckConstructor(Constructor);
5016 // Check the default arguments, which we may have added.
5017 if (!Method->isInvalidDecl())
5018 CheckCXXDefaultArguments(Method);
5021 /// CheckConstructorDeclarator - Called by ActOnDeclarator to check
5022 /// the well-formedness of the constructor declarator @p D with type @p
5023 /// R. If there are any errors in the declarator, this routine will
5024 /// emit diagnostics and set the invalid bit to true. In any case, the type
5025 /// will be updated to reflect a well-formed type for the constructor and
5027 QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R,
5029 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
5031 // C++ [class.ctor]p3:
5032 // A constructor shall not be virtual (10.3) or static (9.4). A
5033 // constructor can be invoked for a const, volatile or const
5034 // volatile object. A constructor shall not be declared const,
5035 // volatile, or const volatile (9.3.2).
5037 if (!D.isInvalidType())
5038 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
5039 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc())
5040 << SourceRange(D.getIdentifierLoc());
5043 if (SC == SC_Static) {
5044 if (!D.isInvalidType())
5045 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
5046 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
5047 << SourceRange(D.getIdentifierLoc());
5052 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
5053 if (FTI.TypeQuals != 0) {
5054 if (FTI.TypeQuals & Qualifiers::Const)
5055 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
5056 << "const" << SourceRange(D.getIdentifierLoc());
5057 if (FTI.TypeQuals & Qualifiers::Volatile)
5058 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
5059 << "volatile" << SourceRange(D.getIdentifierLoc());
5060 if (FTI.TypeQuals & Qualifiers::Restrict)
5061 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
5062 << "restrict" << SourceRange(D.getIdentifierLoc());
5066 // C++0x [class.ctor]p4:
5067 // A constructor shall not be declared with a ref-qualifier.
5068 if (FTI.hasRefQualifier()) {
5069 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor)
5070 << FTI.RefQualifierIsLValueRef
5071 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
5075 // Rebuild the function type "R" without any type qualifiers (in
5076 // case any of the errors above fired) and with "void" as the
5077 // return type, since constructors don't have return types.
5078 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
5079 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType())
5082 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
5084 EPI.RefQualifier = RQ_None;
5086 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(),
5087 Proto->getNumArgs(), EPI);
5090 /// CheckConstructor - Checks a fully-formed constructor for
5091 /// well-formedness, issuing any diagnostics required. Returns true if
5092 /// the constructor declarator is invalid.
5093 void Sema::CheckConstructor(CXXConstructorDecl *Constructor) {
5094 CXXRecordDecl *ClassDecl
5095 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext());
5097 return Constructor->setInvalidDecl();
5099 // C++ [class.copy]p3:
5100 // A declaration of a constructor for a class X is ill-formed if
5101 // its first parameter is of type (optionally cv-qualified) X and
5102 // either there are no other parameters or else all other
5103 // parameters have default arguments.
5104 if (!Constructor->isInvalidDecl() &&
5105 ((Constructor->getNumParams() == 1) ||
5106 (Constructor->getNumParams() > 1 &&
5107 Constructor->getParamDecl(1)->hasDefaultArg())) &&
5108 Constructor->getTemplateSpecializationKind()
5109 != TSK_ImplicitInstantiation) {
5110 QualType ParamType = Constructor->getParamDecl(0)->getType();
5111 QualType ClassTy = Context.getTagDeclType(ClassDecl);
5112 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) {
5113 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation();
5114 const char *ConstRef
5115 = Constructor->getParamDecl(0)->getIdentifier() ? "const &"
5117 Diag(ParamLoc, diag::err_constructor_byvalue_arg)
5118 << FixItHint::CreateInsertion(ParamLoc, ConstRef);
5120 // FIXME: Rather that making the constructor invalid, we should endeavor
5122 Constructor->setInvalidDecl();
5127 /// CheckDestructor - Checks a fully-formed destructor definition for
5128 /// well-formedness, issuing any diagnostics required. Returns true
5130 bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) {
5131 CXXRecordDecl *RD = Destructor->getParent();
5133 if (Destructor->isVirtual()) {
5136 if (!Destructor->isImplicit())
5137 Loc = Destructor->getLocation();
5139 Loc = RD->getLocation();
5141 // If we have a virtual destructor, look up the deallocation function
5142 FunctionDecl *OperatorDelete = 0;
5143 DeclarationName Name =
5144 Context.DeclarationNames.getCXXOperatorName(OO_Delete);
5145 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete))
5148 MarkFunctionReferenced(Loc, OperatorDelete);
5150 Destructor->setOperatorDelete(OperatorDelete);
5157 FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) {
5158 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
5159 FTI.ArgInfo[0].Param &&
5160 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType());
5163 /// CheckDestructorDeclarator - Called by ActOnDeclarator to check
5164 /// the well-formednes of the destructor declarator @p D with type @p
5165 /// R. If there are any errors in the declarator, this routine will
5166 /// emit diagnostics and set the declarator to invalid. Even if this happens,
5167 /// will be updated to reflect a well-formed type for the destructor and
5169 QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R,
5171 // C++ [class.dtor]p1:
5172 // [...] A typedef-name that names a class is a class-name
5173 // (7.1.3); however, a typedef-name that names a class shall not
5174 // be used as the identifier in the declarator for a destructor
5176 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName);
5177 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>())
5178 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
5179 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl());
5180 else if (const TemplateSpecializationType *TST =
5181 DeclaratorType->getAs<TemplateSpecializationType>())
5182 if (TST->isTypeAlias())
5183 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
5184 << DeclaratorType << 1;
5186 // C++ [class.dtor]p2:
5187 // A destructor is used to destroy objects of its class type. A
5188 // destructor takes no parameters, and no return type can be
5189 // specified for it (not even void). The address of a destructor
5190 // shall not be taken. A destructor shall not be static. A
5191 // destructor can be invoked for a const, volatile or const
5192 // volatile object. A destructor shall not be declared const,
5193 // volatile or const volatile (9.3.2).
5194 if (SC == SC_Static) {
5195 if (!D.isInvalidType())
5196 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be)
5197 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
5198 << SourceRange(D.getIdentifierLoc())
5199 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
5203 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
5204 // Destructors don't have return types, but the parser will
5205 // happily parse something like:
5211 // The return type will be eliminated later.
5212 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type)
5213 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
5214 << SourceRange(D.getIdentifierLoc());
5217 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
5218 if (FTI.TypeQuals != 0 && !D.isInvalidType()) {
5219 if (FTI.TypeQuals & Qualifiers::Const)
5220 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
5221 << "const" << SourceRange(D.getIdentifierLoc());
5222 if (FTI.TypeQuals & Qualifiers::Volatile)
5223 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
5224 << "volatile" << SourceRange(D.getIdentifierLoc());
5225 if (FTI.TypeQuals & Qualifiers::Restrict)
5226 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
5227 << "restrict" << SourceRange(D.getIdentifierLoc());
5231 // C++0x [class.dtor]p2:
5232 // A destructor shall not be declared with a ref-qualifier.
5233 if (FTI.hasRefQualifier()) {
5234 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor)
5235 << FTI.RefQualifierIsLValueRef
5236 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
5240 // Make sure we don't have any parameters.
5241 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) {
5242 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params);
5244 // Delete the parameters.
5249 // Make sure the destructor isn't variadic.
5250 if (FTI.isVariadic) {
5251 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic);
5255 // Rebuild the function type "R" without any type qualifiers or
5256 // parameters (in case any of the errors above fired) and with
5257 // "void" as the return type, since destructors don't have return
5259 if (!D.isInvalidType())
5262 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
5263 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
5264 EPI.Variadic = false;
5266 EPI.RefQualifier = RQ_None;
5267 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI);
5270 /// CheckConversionDeclarator - Called by ActOnDeclarator to check the
5271 /// well-formednes of the conversion function declarator @p D with
5272 /// type @p R. If there are any errors in the declarator, this routine
5273 /// will emit diagnostics and return true. Otherwise, it will return
5274 /// false. Either way, the type @p R will be updated to reflect a
5275 /// well-formed type for the conversion operator.
5276 void Sema::CheckConversionDeclarator(Declarator &D, QualType &R,
5278 // C++ [class.conv.fct]p1:
5279 // Neither parameter types nor return type can be specified. The
5280 // type of a conversion function (8.3.5) is "function taking no
5281 // parameter returning conversion-type-id."
5282 if (SC == SC_Static) {
5283 if (!D.isInvalidType())
5284 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member)
5285 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
5286 << SourceRange(D.getIdentifierLoc());
5291 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId);
5293 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
5294 // Conversion functions don't have return types, but the parser will
5295 // happily parse something like:
5298 // float operator bool();
5301 // The return type will be changed later anyway.
5302 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type)
5303 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
5304 << SourceRange(D.getIdentifierLoc());
5308 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
5310 // Make sure we don't have any parameters.
5311 if (Proto->getNumArgs() > 0) {
5312 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params);
5314 // Delete the parameters.
5315 D.getFunctionTypeInfo().freeArgs();
5317 } else if (Proto->isVariadic()) {
5318 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic);
5322 // Diagnose "&operator bool()" and other such nonsense. This
5323 // is actually a gcc extension which we don't support.
5324 if (Proto->getResultType() != ConvType) {
5325 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl)
5326 << Proto->getResultType();
5328 ConvType = Proto->getResultType();
5331 // C++ [class.conv.fct]p4:
5332 // The conversion-type-id shall not represent a function type nor
5334 if (ConvType->isArrayType()) {
5335 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array);
5336 ConvType = Context.getPointerType(ConvType);
5338 } else if (ConvType->isFunctionType()) {
5339 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function);
5340 ConvType = Context.getPointerType(ConvType);
5344 // Rebuild the function type "R" without any parameters (in case any
5345 // of the errors above fired) and with the conversion type as the
5347 if (D.isInvalidType())
5348 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo());
5350 // C++0x explicit conversion operators.
5351 if (D.getDeclSpec().isExplicitSpecified())
5352 Diag(D.getDeclSpec().getExplicitSpecLoc(),
5353 getLangOpts().CPlusPlus0x ?
5354 diag::warn_cxx98_compat_explicit_conversion_functions :
5355 diag::ext_explicit_conversion_functions)
5356 << SourceRange(D.getDeclSpec().getExplicitSpecLoc());
5359 /// ActOnConversionDeclarator - Called by ActOnDeclarator to complete
5360 /// the declaration of the given C++ conversion function. This routine
5361 /// is responsible for recording the conversion function in the C++
5362 /// class, if possible.
5363 Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) {
5364 assert(Conversion && "Expected to receive a conversion function declaration");
5366 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext());
5368 // Make sure we aren't redeclaring the conversion function.
5369 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType());
5371 // C++ [class.conv.fct]p1:
5372 // [...] A conversion function is never used to convert a
5373 // (possibly cv-qualified) object to the (possibly cv-qualified)
5374 // same object type (or a reference to it), to a (possibly
5375 // cv-qualified) base class of that type (or a reference to it),
5376 // or to (possibly cv-qualified) void.
5377 // FIXME: Suppress this warning if the conversion function ends up being a
5378 // virtual function that overrides a virtual function in a base class.
5380 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
5381 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>())
5382 ConvType = ConvTypeRef->getPointeeType();
5383 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared &&
5384 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization)
5385 /* Suppress diagnostics for instantiations. */;
5386 else if (ConvType->isRecordType()) {
5387 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType();
5388 if (ConvType == ClassType)
5389 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used)
5391 else if (IsDerivedFrom(ClassType, ConvType))
5392 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used)
5393 << ClassType << ConvType;
5394 } else if (ConvType->isVoidType()) {
5395 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used)
5396 << ClassType << ConvType;
5399 if (FunctionTemplateDecl *ConversionTemplate
5400 = Conversion->getDescribedFunctionTemplate())
5401 return ConversionTemplate;
5406 //===----------------------------------------------------------------------===//
5407 // Namespace Handling
5408 //===----------------------------------------------------------------------===//
5412 /// ActOnStartNamespaceDef - This is called at the start of a namespace
5414 Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope,
5415 SourceLocation InlineLoc,
5416 SourceLocation NamespaceLoc,
5417 SourceLocation IdentLoc,
5419 SourceLocation LBrace,
5420 AttributeList *AttrList) {
5421 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc;
5422 // For anonymous namespace, take the location of the left brace.
5423 SourceLocation Loc = II ? IdentLoc : LBrace;
5424 bool IsInline = InlineLoc.isValid();
5425 bool IsInvalid = false;
5427 bool AddToKnown = false;
5428 Scope *DeclRegionScope = NamespcScope->getParent();
5430 NamespaceDecl *PrevNS = 0;
5432 // C++ [namespace.def]p2:
5433 // The identifier in an original-namespace-definition shall not
5434 // have been previously defined in the declarative region in
5435 // which the original-namespace-definition appears. The
5436 // identifier in an original-namespace-definition is the name of
5437 // the namespace. Subsequently in that declarative region, it is
5438 // treated as an original-namespace-name.
5440 // Since namespace names are unique in their scope, and we don't
5441 // look through using directives, just look for any ordinary names.
5443 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member |
5444 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag |
5445 Decl::IDNS_Namespace;
5446 NamedDecl *PrevDecl = 0;
5447 for (DeclContext::lookup_result R
5448 = CurContext->getRedeclContext()->lookup(II);
5449 R.first != R.second; ++R.first) {
5450 if ((*R.first)->getIdentifierNamespace() & IDNS) {
5451 PrevDecl = *R.first;
5456 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl);
5459 // This is an extended namespace definition.
5460 if (IsInline != PrevNS->isInline()) {
5461 // inline-ness must match
5462 if (PrevNS->isInline()) {
5463 // The user probably just forgot the 'inline', so suggest that it
5465 Diag(Loc, diag::warn_inline_namespace_reopened_noninline)
5466 << FixItHint::CreateInsertion(NamespaceLoc, "inline ");
5468 Diag(Loc, diag::err_inline_namespace_mismatch)
5471 Diag(PrevNS->getLocation(), diag::note_previous_definition);
5473 IsInline = PrevNS->isInline();
5475 } else if (PrevDecl) {
5476 // This is an invalid name redefinition.
5477 Diag(Loc, diag::err_redefinition_different_kind)
5479 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
5481 // Continue on to push Namespc as current DeclContext and return it.
5482 } else if (II->isStr("std") &&
5483 CurContext->getRedeclContext()->isTranslationUnit()) {
5484 // This is the first "real" definition of the namespace "std", so update
5485 // our cache of the "std" namespace to point at this definition.
5486 PrevNS = getStdNamespace();
5488 AddToKnown = !IsInline;
5490 // We've seen this namespace for the first time.
5491 AddToKnown = !IsInline;
5494 // Anonymous namespaces.
5496 // Determine whether the parent already has an anonymous namespace.
5497 DeclContext *Parent = CurContext->getRedeclContext();
5498 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
5499 PrevNS = TU->getAnonymousNamespace();
5501 NamespaceDecl *ND = cast<NamespaceDecl>(Parent);
5502 PrevNS = ND->getAnonymousNamespace();
5505 if (PrevNS && IsInline != PrevNS->isInline()) {
5506 // inline-ness must match
5507 Diag(Loc, diag::err_inline_namespace_mismatch)
5509 Diag(PrevNS->getLocation(), diag::note_previous_definition);
5511 // Recover by ignoring the new namespace's inline status.
5512 IsInline = PrevNS->isInline();
5516 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline,
5517 StartLoc, Loc, II, PrevNS);
5519 Namespc->setInvalidDecl();
5521 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList);
5523 // FIXME: Should we be merging attributes?
5524 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>())
5525 PushNamespaceVisibilityAttr(Attr, Loc);
5528 StdNamespace = Namespc;
5530 KnownNamespaces[Namespc] = false;
5533 PushOnScopeChains(Namespc, DeclRegionScope);
5535 // Link the anonymous namespace into its parent.
5536 DeclContext *Parent = CurContext->getRedeclContext();
5537 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
5538 TU->setAnonymousNamespace(Namespc);
5540 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc);
5543 CurContext->addDecl(Namespc);
5545 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition
5546 // behaves as if it were replaced by
5547 // namespace unique { /* empty body */ }
5548 // using namespace unique;
5549 // namespace unique { namespace-body }
5550 // where all occurrences of 'unique' in a translation unit are
5551 // replaced by the same identifier and this identifier differs
5552 // from all other identifiers in the entire program.
5554 // We just create the namespace with an empty name and then add an
5555 // implicit using declaration, just like the standard suggests.
5557 // CodeGen enforces the "universally unique" aspect by giving all
5558 // declarations semantically contained within an anonymous
5559 // namespace internal linkage.
5562 UsingDirectiveDecl* UD
5563 = UsingDirectiveDecl::Create(Context, CurContext,
5564 /* 'using' */ LBrace,
5565 /* 'namespace' */ SourceLocation(),
5566 /* qualifier */ NestedNameSpecifierLoc(),
5567 /* identifier */ SourceLocation(),
5569 /* Ancestor */ CurContext);
5571 CurContext->addDecl(UD);
5575 // Although we could have an invalid decl (i.e. the namespace name is a
5576 // redefinition), push it as current DeclContext and try to continue parsing.
5577 // FIXME: We should be able to push Namespc here, so that the each DeclContext
5578 // for the namespace has the declarations that showed up in that particular
5579 // namespace definition.
5580 PushDeclContext(NamespcScope, Namespc);
5584 /// getNamespaceDecl - Returns the namespace a decl represents. If the decl
5585 /// is a namespace alias, returns the namespace it points to.
5586 static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) {
5587 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D))
5588 return AD->getNamespace();
5589 return dyn_cast_or_null<NamespaceDecl>(D);
5592 /// ActOnFinishNamespaceDef - This callback is called after a namespace is
5593 /// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef.
5594 void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) {
5595 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl);
5596 assert(Namespc && "Invalid parameter, expected NamespaceDecl");
5597 Namespc->setRBraceLoc(RBrace);
5599 if (Namespc->hasAttr<VisibilityAttr>())
5600 PopPragmaVisibility(true, RBrace);
5603 CXXRecordDecl *Sema::getStdBadAlloc() const {
5604 return cast_or_null<CXXRecordDecl>(
5605 StdBadAlloc.get(Context.getExternalSource()));
5608 NamespaceDecl *Sema::getStdNamespace() const {
5609 return cast_or_null<NamespaceDecl>(
5610 StdNamespace.get(Context.getExternalSource()));
5613 /// \brief Retrieve the special "std" namespace, which may require us to
5614 /// implicitly define the namespace.
5615 NamespaceDecl *Sema::getOrCreateStdNamespace() {
5616 if (!StdNamespace) {
5617 // The "std" namespace has not yet been defined, so build one implicitly.
5618 StdNamespace = NamespaceDecl::Create(Context,
5619 Context.getTranslationUnitDecl(),
5621 SourceLocation(), SourceLocation(),
5622 &PP.getIdentifierTable().get("std"),
5624 getStdNamespace()->setImplicit(true);
5627 return getStdNamespace();
5630 bool Sema::isStdInitializerList(QualType Ty, QualType *Element) {
5631 assert(getLangOpts().CPlusPlus &&
5632 "Looking for std::initializer_list outside of C++.");
5634 // We're looking for implicit instantiations of
5635 // template <typename E> class std::initializer_list.
5637 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it.
5640 ClassTemplateDecl *Template = 0;
5641 const TemplateArgument *Arguments = 0;
5643 if (const RecordType *RT = Ty->getAs<RecordType>()) {
5645 ClassTemplateSpecializationDecl *Specialization =
5646 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl());
5647 if (!Specialization)
5650 Template = Specialization->getSpecializedTemplate();
5651 Arguments = Specialization->getTemplateArgs().data();
5652 } else if (const TemplateSpecializationType *TST =
5653 Ty->getAs<TemplateSpecializationType>()) {
5654 Template = dyn_cast_or_null<ClassTemplateDecl>(
5655 TST->getTemplateName().getAsTemplateDecl());
5656 Arguments = TST->getArgs();
5661 if (!StdInitializerList) {
5662 // Haven't recognized std::initializer_list yet, maybe this is it.
5663 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl();
5664 if (TemplateClass->getIdentifier() !=
5665 &PP.getIdentifierTable().get("initializer_list") ||
5666 !getStdNamespace()->InEnclosingNamespaceSetOf(
5667 TemplateClass->getDeclContext()))
5669 // This is a template called std::initializer_list, but is it the right
5671 TemplateParameterList *Params = Template->getTemplateParameters();
5672 if (Params->getMinRequiredArguments() != 1)
5674 if (!isa<TemplateTypeParmDecl>(Params->getParam(0)))
5677 // It's the right template.
5678 StdInitializerList = Template;
5681 if (Template != StdInitializerList)
5684 // This is an instance of std::initializer_list. Find the argument type.
5686 *Element = Arguments[0].getAsType();
5690 static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){
5691 NamespaceDecl *Std = S.getStdNamespace();
5693 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
5697 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"),
5698 Loc, Sema::LookupOrdinaryName);
5699 if (!S.LookupQualifiedName(Result, Std)) {
5700 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
5703 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>();
5705 Result.suppressDiagnostics();
5706 // We found something weird. Complain about the first thing we found.
5707 NamedDecl *Found = *Result.begin();
5708 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list);
5712 // We found some template called std::initializer_list. Now verify that it's
5714 TemplateParameterList *Params = Template->getTemplateParameters();
5715 if (Params->getMinRequiredArguments() != 1 ||
5716 !isa<TemplateTypeParmDecl>(Params->getParam(0))) {
5717 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list);
5724 QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) {
5725 if (!StdInitializerList) {
5726 StdInitializerList = LookupStdInitializerList(*this, Loc);
5727 if (!StdInitializerList)
5731 TemplateArgumentListInfo Args(Loc, Loc);
5732 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element),
5733 Context.getTrivialTypeSourceInfo(Element,
5735 return Context.getCanonicalType(
5736 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args));
5739 bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) {
5740 // C++ [dcl.init.list]p2:
5741 // A constructor is an initializer-list constructor if its first parameter
5742 // is of type std::initializer_list<E> or reference to possibly cv-qualified
5743 // std::initializer_list<E> for some type E, and either there are no other
5744 // parameters or else all other parameters have default arguments.
5745 if (Ctor->getNumParams() < 1 ||
5746 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg()))
5749 QualType ArgType = Ctor->getParamDecl(0)->getType();
5750 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>())
5751 ArgType = RT->getPointeeType().getUnqualifiedType();
5753 return isStdInitializerList(ArgType, 0);
5756 /// \brief Determine whether a using statement is in a context where it will be
5757 /// apply in all contexts.
5758 static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) {
5759 switch (CurContext->getDeclKind()) {
5760 case Decl::TranslationUnit:
5762 case Decl::LinkageSpec:
5763 return IsUsingDirectiveInToplevelContext(CurContext->getParent());
5771 // Callback to only accept typo corrections that are namespaces.
5772 class NamespaceValidatorCCC : public CorrectionCandidateCallback {
5774 virtual bool ValidateCandidate(const TypoCorrection &candidate) {
5775 if (NamedDecl *ND = candidate.getCorrectionDecl()) {
5776 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND);
5784 static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc,
5786 SourceLocation IdentLoc,
5787 IdentifierInfo *Ident) {
5788 NamespaceValidatorCCC Validator;
5790 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(),
5791 R.getLookupKind(), Sc, &SS,
5793 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts()));
5794 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts()));
5795 if (DeclContext *DC = S.computeDeclContext(SS, false))
5796 S.Diag(IdentLoc, diag::err_using_directive_member_suggest)
5797 << Ident << DC << CorrectedQuotedStr << SS.getRange()
5798 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr);
5800 S.Diag(IdentLoc, diag::err_using_directive_suggest)
5801 << Ident << CorrectedQuotedStr
5802 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr);
5804 S.Diag(Corrected.getCorrectionDecl()->getLocation(),
5805 diag::note_namespace_defined_here) << CorrectedQuotedStr;
5807 R.addDecl(Corrected.getCorrectionDecl());
5813 Decl *Sema::ActOnUsingDirective(Scope *S,
5814 SourceLocation UsingLoc,
5815 SourceLocation NamespcLoc,
5817 SourceLocation IdentLoc,
5818 IdentifierInfo *NamespcName,
5819 AttributeList *AttrList) {
5820 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
5821 assert(NamespcName && "Invalid NamespcName.");
5822 assert(IdentLoc.isValid() && "Invalid NamespceName location.");
5824 // This can only happen along a recovery path.
5825 while (S->getFlags() & Scope::TemplateParamScope)
5827 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
5829 UsingDirectiveDecl *UDir = 0;
5830 NestedNameSpecifier *Qualifier = 0;
5832 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
5834 // Lookup namespace name.
5835 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName);
5836 LookupParsedName(R, S, &SS);
5837 if (R.isAmbiguous())
5842 // Allow "using namespace std;" or "using namespace ::std;" even if
5843 // "std" hasn't been defined yet, for GCC compatibility.
5844 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) &&
5845 NamespcName->isStr("std")) {
5846 Diag(IdentLoc, diag::ext_using_undefined_std);
5847 R.addDecl(getOrCreateStdNamespace());
5850 // Otherwise, attempt typo correction.
5851 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName);
5855 NamedDecl *Named = R.getFoundDecl();
5856 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named))
5857 && "expected namespace decl");
5858 // C++ [namespace.udir]p1:
5859 // A using-directive specifies that the names in the nominated
5860 // namespace can be used in the scope in which the
5861 // using-directive appears after the using-directive. During
5862 // unqualified name lookup (3.4.1), the names appear as if they
5863 // were declared in the nearest enclosing namespace which
5864 // contains both the using-directive and the nominated
5865 // namespace. [Note: in this context, "contains" means "contains
5866 // directly or indirectly". ]
5868 // Find enclosing context containing both using-directive and
5869 // nominated namespace.
5870 NamespaceDecl *NS = getNamespaceDecl(Named);
5871 DeclContext *CommonAncestor = cast<DeclContext>(NS);
5872 while (CommonAncestor && !CommonAncestor->Encloses(CurContext))
5873 CommonAncestor = CommonAncestor->getParent();
5875 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc,
5876 SS.getWithLocInContext(Context),
5877 IdentLoc, Named, CommonAncestor);
5879 if (IsUsingDirectiveInToplevelContext(CurContext) &&
5880 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) {
5881 Diag(IdentLoc, diag::warn_using_directive_in_header);
5884 PushUsingDirective(S, UDir);
5886 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
5889 // FIXME: We ignore attributes for now.
5893 void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) {
5894 // If the scope has an associated entity and the using directive is at
5895 // namespace or translation unit scope, add the UsingDirectiveDecl into
5896 // its lookup structure so qualified name lookup can find it.
5897 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity());
5898 if (Ctx && !Ctx->isFunctionOrMethod())
5901 // Otherwise, it is at block sope. The using-directives will affect lookup
5902 // only to the end of the scope.
5903 S->PushUsingDirective(UDir);
5907 Decl *Sema::ActOnUsingDeclaration(Scope *S,
5909 bool HasUsingKeyword,
5910 SourceLocation UsingLoc,
5912 UnqualifiedId &Name,
5913 AttributeList *AttrList,
5915 SourceLocation TypenameLoc) {
5916 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
5918 switch (Name.getKind()) {
5919 case UnqualifiedId::IK_ImplicitSelfParam:
5920 case UnqualifiedId::IK_Identifier:
5921 case UnqualifiedId::IK_OperatorFunctionId:
5922 case UnqualifiedId::IK_LiteralOperatorId:
5923 case UnqualifiedId::IK_ConversionFunctionId:
5926 case UnqualifiedId::IK_ConstructorName:
5927 case UnqualifiedId::IK_ConstructorTemplateId:
5928 // C++11 inheriting constructors.
5929 Diag(Name.getLocStart(),
5930 getLangOpts().CPlusPlus0x ?
5931 // FIXME: Produce warn_cxx98_compat_using_decl_constructor
5932 // instead once inheriting constructors work.
5933 diag::err_using_decl_constructor_unsupported :
5934 diag::err_using_decl_constructor)
5937 if (getLangOpts().CPlusPlus0x) break;
5941 case UnqualifiedId::IK_DestructorName:
5942 Diag(Name.getLocStart(), diag::err_using_decl_destructor)
5946 case UnqualifiedId::IK_TemplateId:
5947 Diag(Name.getLocStart(), diag::err_using_decl_template_id)
5948 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc);
5952 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name);
5953 DeclarationName TargetName = TargetNameInfo.getName();
5957 // Warn about using declarations.
5958 // TODO: store that the declaration was written without 'using' and
5959 // talk about access decls instead of using decls in the
5961 if (!HasUsingKeyword) {
5962 UsingLoc = Name.getLocStart();
5964 Diag(UsingLoc, diag::warn_access_decl_deprecated)
5965 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using ");
5968 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) ||
5969 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration))
5972 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS,
5973 TargetNameInfo, AttrList,
5974 /* IsInstantiation */ false,
5975 IsTypeName, TypenameLoc);
5977 PushOnScopeChains(UD, S, /*AddToContext*/ false);
5982 /// \brief Determine whether a using declaration considers the given
5983 /// declarations as "equivalent", e.g., if they are redeclarations of
5984 /// the same entity or are both typedefs of the same type.
5986 IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2,
5987 bool &SuppressRedeclaration) {
5988 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) {
5989 SuppressRedeclaration = false;
5993 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1))
5994 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) {
5995 SuppressRedeclaration = true;
5996 return Context.hasSameType(TD1->getUnderlyingType(),
5997 TD2->getUnderlyingType());
6004 /// Determines whether to create a using shadow decl for a particular
6005 /// decl, given the set of decls existing prior to this using lookup.
6006 bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig,
6007 const LookupResult &Previous) {
6008 // Diagnose finding a decl which is not from a base class of the
6009 // current class. We do this now because there are cases where this
6010 // function will silently decide not to build a shadow decl, which
6011 // will pre-empt further diagnostics.
6013 // We don't need to do this in C++0x because we do the check once on
6016 // FIXME: diagnose the following if we care enough:
6017 // struct A { int foo; };
6018 // struct B : A { using A::foo; };
6019 // template <class T> struct C : A {};
6020 // template <class T> struct D : C<T> { using B::foo; } // <---
6021 // This is invalid (during instantiation) in C++03 because B::foo
6022 // resolves to the using decl in B, which is not a base class of D<T>.
6023 // We can't diagnose it immediately because C<T> is an unknown
6024 // specialization. The UsingShadowDecl in D<T> then points directly
6025 // to A::foo, which will look well-formed when we instantiate.
6026 // The right solution is to not collapse the shadow-decl chain.
6027 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) {
6028 DeclContext *OrigDC = Orig->getDeclContext();
6030 // Handle enums and anonymous structs.
6031 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent();
6032 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC);
6033 while (OrigRec->isAnonymousStructOrUnion())
6034 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext());
6036 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) {
6037 if (OrigDC == CurContext) {
6038 Diag(Using->getLocation(),
6039 diag::err_using_decl_nested_name_specifier_is_current_class)
6040 << Using->getQualifierLoc().getSourceRange();
6041 Diag(Orig->getLocation(), diag::note_using_decl_target);
6045 Diag(Using->getQualifierLoc().getBeginLoc(),
6046 diag::err_using_decl_nested_name_specifier_is_not_base_class)
6047 << Using->getQualifier()
6048 << cast<CXXRecordDecl>(CurContext)
6049 << Using->getQualifierLoc().getSourceRange();
6050 Diag(Orig->getLocation(), diag::note_using_decl_target);
6055 if (Previous.empty()) return false;
6057 NamedDecl *Target = Orig;
6058 if (isa<UsingShadowDecl>(Target))
6059 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
6061 // If the target happens to be one of the previous declarations, we
6062 // don't have a conflict.
6064 // FIXME: but we might be increasing its access, in which case we
6065 // should redeclare it.
6066 NamedDecl *NonTag = 0, *Tag = 0;
6067 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
6069 NamedDecl *D = (*I)->getUnderlyingDecl();
6071 if (IsEquivalentForUsingDecl(Context, D, Target, Result))
6074 (isa<TagDecl>(D) ? Tag : NonTag) = D;
6077 if (Target->isFunctionOrFunctionTemplate()) {
6079 if (isa<FunctionTemplateDecl>(Target))
6080 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl();
6082 FD = cast<FunctionDecl>(Target);
6084 NamedDecl *OldDecl = 0;
6085 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) {
6089 case Ovl_NonFunction:
6090 Diag(Using->getLocation(), diag::err_using_decl_conflict);
6093 // We found a decl with the exact signature.
6095 // If we're in a record, we want to hide the target, so we
6096 // return true (without a diagnostic) to tell the caller not to
6097 // build a shadow decl.
6098 if (CurContext->isRecord())
6101 // If we're not in a record, this is an error.
6102 Diag(Using->getLocation(), diag::err_using_decl_conflict);
6106 Diag(Target->getLocation(), diag::note_using_decl_target);
6107 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict);
6111 // Target is not a function.
6113 if (isa<TagDecl>(Target)) {
6114 // No conflict between a tag and a non-tag.
6115 if (!Tag) return false;
6117 Diag(Using->getLocation(), diag::err_using_decl_conflict);
6118 Diag(Target->getLocation(), diag::note_using_decl_target);
6119 Diag(Tag->getLocation(), diag::note_using_decl_conflict);
6123 // No conflict between a tag and a non-tag.
6124 if (!NonTag) return false;
6126 Diag(Using->getLocation(), diag::err_using_decl_conflict);
6127 Diag(Target->getLocation(), diag::note_using_decl_target);
6128 Diag(NonTag->getLocation(), diag::note_using_decl_conflict);
6132 /// Builds a shadow declaration corresponding to a 'using' declaration.
6133 UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S,
6137 // If we resolved to another shadow declaration, just coalesce them.
6138 NamedDecl *Target = Orig;
6139 if (isa<UsingShadowDecl>(Target)) {
6140 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
6141 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration");
6144 UsingShadowDecl *Shadow
6145 = UsingShadowDecl::Create(Context, CurContext,
6146 UD->getLocation(), UD, Target);
6147 UD->addShadowDecl(Shadow);
6149 Shadow->setAccess(UD->getAccess());
6150 if (Orig->isInvalidDecl() || UD->isInvalidDecl())
6151 Shadow->setInvalidDecl();
6154 PushOnScopeChains(Shadow, S);
6156 CurContext->addDecl(Shadow);
6162 /// Hides a using shadow declaration. This is required by the current
6163 /// using-decl implementation when a resolvable using declaration in a
6164 /// class is followed by a declaration which would hide or override
6165 /// one or more of the using decl's targets; for example:
6167 /// struct Base { void foo(int); };
6168 /// struct Derived : Base {
6169 /// using Base::foo;
6173 /// The governing language is C++03 [namespace.udecl]p12:
6175 /// When a using-declaration brings names from a base class into a
6176 /// derived class scope, member functions in the derived class
6177 /// override and/or hide member functions with the same name and
6178 /// parameter types in a base class (rather than conflicting).
6180 /// There are two ways to implement this:
6181 /// (1) optimistically create shadow decls when they're not hidden
6182 /// by existing declarations, or
6183 /// (2) don't create any shadow decls (or at least don't make them
6184 /// visible) until we've fully parsed/instantiated the class.
6185 /// The problem with (1) is that we might have to retroactively remove
6186 /// a shadow decl, which requires several O(n) operations because the
6187 /// decl structures are (very reasonably) not designed for removal.
6188 /// (2) avoids this but is very fiddly and phase-dependent.
6189 void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) {
6190 if (Shadow->getDeclName().getNameKind() ==
6191 DeclarationName::CXXConversionFunctionName)
6192 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow);
6194 // Remove it from the DeclContext...
6195 Shadow->getDeclContext()->removeDecl(Shadow);
6197 // ...and the scope, if applicable...
6199 S->RemoveDecl(Shadow);
6200 IdResolver.RemoveDecl(Shadow);
6203 // ...and the using decl.
6204 Shadow->getUsingDecl()->removeShadowDecl(Shadow);
6206 // TODO: complain somehow if Shadow was used. It shouldn't
6207 // be possible for this to happen, because...?
6210 /// Builds a using declaration.
6212 /// \param IsInstantiation - Whether this call arises from an
6213 /// instantiation of an unresolved using declaration. We treat
6214 /// the lookup differently for these declarations.
6215 NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
6216 SourceLocation UsingLoc,
6218 const DeclarationNameInfo &NameInfo,
6219 AttributeList *AttrList,
6220 bool IsInstantiation,
6222 SourceLocation TypenameLoc) {
6223 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
6224 SourceLocation IdentLoc = NameInfo.getLoc();
6225 assert(IdentLoc.isValid() && "Invalid TargetName location.");
6227 // FIXME: We ignore attributes for now.
6230 Diag(IdentLoc, diag::err_using_requires_qualname);
6234 // Do the redeclaration lookup in the current scope.
6235 LookupResult Previous(*this, NameInfo, LookupUsingDeclName,
6237 Previous.setHideTags(false);
6239 LookupName(Previous, S);
6241 // It is really dumb that we have to do this.
6242 LookupResult::Filter F = Previous.makeFilter();
6243 while (F.hasNext()) {
6244 NamedDecl *D = F.next();
6245 if (!isDeclInScope(D, CurContext, S))
6250 assert(IsInstantiation && "no scope in non-instantiation");
6251 assert(CurContext->isRecord() && "scope not record in instantiation");
6252 LookupQualifiedName(Previous, CurContext);
6255 // Check for invalid redeclarations.
6256 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous))
6259 // Check for bad qualifiers.
6260 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc))
6263 DeclContext *LookupContext = computeDeclContext(SS);
6265 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
6266 if (!LookupContext) {
6268 // FIXME: not all declaration name kinds are legal here
6269 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext,
6270 UsingLoc, TypenameLoc,
6272 IdentLoc, NameInfo.getName());
6274 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc,
6275 QualifierLoc, NameInfo);
6278 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc,
6279 NameInfo, IsTypeName);
6282 CurContext->addDecl(D);
6284 if (!LookupContext) return D;
6285 UsingDecl *UD = cast<UsingDecl>(D);
6287 if (RequireCompleteDeclContext(SS, LookupContext)) {
6288 UD->setInvalidDecl();
6292 // The normal rules do not apply to inheriting constructor declarations.
6293 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) {
6294 if (CheckInheritingConstructorUsingDecl(UD))
6295 UD->setInvalidDecl();
6299 // Otherwise, look up the target name.
6301 LookupResult R(*this, NameInfo, LookupOrdinaryName);
6303 // Unlike most lookups, we don't always want to hide tag
6304 // declarations: tag names are visible through the using declaration
6305 // even if hidden by ordinary names, *except* in a dependent context
6306 // where it's important for the sanity of two-phase lookup.
6307 if (!IsInstantiation)
6308 R.setHideTags(false);
6310 // For the purposes of this lookup, we have a base object type
6311 // equal to that of the current context.
6312 if (CurContext->isRecord()) {
6313 R.setBaseObjectType(
6314 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)));
6317 LookupQualifiedName(R, LookupContext);
6320 Diag(IdentLoc, diag::err_no_member)
6321 << NameInfo.getName() << LookupContext << SS.getRange();
6322 UD->setInvalidDecl();
6326 if (R.isAmbiguous()) {
6327 UD->setInvalidDecl();
6332 // If we asked for a typename and got a non-type decl, error out.
6333 if (!R.getAsSingle<TypeDecl>()) {
6334 Diag(IdentLoc, diag::err_using_typename_non_type);
6335 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
6336 Diag((*I)->getUnderlyingDecl()->getLocation(),
6337 diag::note_using_decl_target);
6338 UD->setInvalidDecl();
6342 // If we asked for a non-typename and we got a type, error out,
6343 // but only if this is an instantiation of an unresolved using
6344 // decl. Otherwise just silently find the type name.
6345 if (IsInstantiation && R.getAsSingle<TypeDecl>()) {
6346 Diag(IdentLoc, diag::err_using_dependent_value_is_type);
6347 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target);
6348 UD->setInvalidDecl();
6353 // C++0x N2914 [namespace.udecl]p6:
6354 // A using-declaration shall not name a namespace.
6355 if (R.getAsSingle<NamespaceDecl>()) {
6356 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace)
6358 UD->setInvalidDecl();
6362 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
6363 if (!CheckUsingShadowDecl(UD, *I, Previous))
6364 BuildUsingShadowDecl(S, UD, *I);
6370 /// Additional checks for a using declaration referring to a constructor name.
6371 bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) {
6372 assert(!UD->isTypeName() && "expecting a constructor name");
6374 const Type *SourceType = UD->getQualifier()->getAsType();
6375 assert(SourceType &&
6376 "Using decl naming constructor doesn't have type in scope spec.");
6377 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext);
6379 // Check whether the named type is a direct base class.
6380 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified();
6381 CXXRecordDecl::base_class_iterator BaseIt, BaseE;
6382 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end();
6383 BaseIt != BaseE; ++BaseIt) {
6384 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified();
6385 if (CanonicalSourceType == BaseType)
6387 if (BaseIt->getType()->isDependentType())
6391 if (BaseIt == BaseE) {
6392 // Did not find SourceType in the bases.
6393 Diag(UD->getUsingLocation(),
6394 diag::err_using_decl_constructor_not_in_direct_base)
6395 << UD->getNameInfo().getSourceRange()
6396 << QualType(SourceType, 0) << TargetClass;
6400 if (!CurContext->isDependentContext())
6401 BaseIt->setInheritConstructors();
6406 /// Checks that the given using declaration is not an invalid
6407 /// redeclaration. Note that this is checking only for the using decl
6408 /// itself, not for any ill-formedness among the UsingShadowDecls.
6409 bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
6411 const CXXScopeSpec &SS,
6412 SourceLocation NameLoc,
6413 const LookupResult &Prev) {
6414 // C++03 [namespace.udecl]p8:
6415 // C++0x [namespace.udecl]p10:
6416 // A using-declaration is a declaration and can therefore be used
6417 // repeatedly where (and only where) multiple declarations are
6420 // That's in non-member contexts.
6421 if (!CurContext->getRedeclContext()->isRecord())
6424 NestedNameSpecifier *Qual
6425 = static_cast<NestedNameSpecifier*>(SS.getScopeRep());
6427 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) {
6431 NestedNameSpecifier *DQual;
6432 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) {
6433 DTypename = UD->isTypeName();
6434 DQual = UD->getQualifier();
6435 } else if (UnresolvedUsingValueDecl *UD
6436 = dyn_cast<UnresolvedUsingValueDecl>(D)) {
6438 DQual = UD->getQualifier();
6439 } else if (UnresolvedUsingTypenameDecl *UD
6440 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
6442 DQual = UD->getQualifier();
6445 // using decls differ if one says 'typename' and the other doesn't.
6446 // FIXME: non-dependent using decls?
6447 if (isTypeName != DTypename) continue;
6449 // using decls differ if they name different scopes (but note that
6450 // template instantiation can cause this check to trigger when it
6451 // didn't before instantiation).
6452 if (Context.getCanonicalNestedNameSpecifier(Qual) !=
6453 Context.getCanonicalNestedNameSpecifier(DQual))
6456 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange();
6457 Diag(D->getLocation(), diag::note_using_decl) << 1;
6465 /// Checks that the given nested-name qualifier used in a using decl
6466 /// in the current context is appropriately related to the current
6467 /// scope. If an error is found, diagnoses it and returns true.
6468 bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc,
6469 const CXXScopeSpec &SS,
6470 SourceLocation NameLoc) {
6471 DeclContext *NamedContext = computeDeclContext(SS);
6473 if (!CurContext->isRecord()) {
6474 // C++03 [namespace.udecl]p3:
6475 // C++0x [namespace.udecl]p8:
6476 // A using-declaration for a class member shall be a member-declaration.
6478 // If we weren't able to compute a valid scope, it must be a
6479 // dependent class scope.
6480 if (!NamedContext || NamedContext->isRecord()) {
6481 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member)
6486 // Otherwise, everything is known to be fine.
6490 // The current scope is a record.
6492 // If the named context is dependent, we can't decide much.
6493 if (!NamedContext) {
6494 // FIXME: in C++0x, we can diagnose if we can prove that the
6495 // nested-name-specifier does not refer to a base class, which is
6496 // still possible in some cases.
6498 // Otherwise we have to conservatively report that things might be
6503 if (!NamedContext->isRecord()) {
6504 // Ideally this would point at the last name in the specifier,
6505 // but we don't have that level of source info.
6506 Diag(SS.getRange().getBegin(),
6507 diag::err_using_decl_nested_name_specifier_is_not_class)
6508 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange();
6512 if (!NamedContext->isDependentContext() &&
6513 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext))
6516 if (getLangOpts().CPlusPlus0x) {
6517 // C++0x [namespace.udecl]p3:
6518 // In a using-declaration used as a member-declaration, the
6519 // nested-name-specifier shall name a base class of the class
6522 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(
6523 cast<CXXRecordDecl>(NamedContext))) {
6524 if (CurContext == NamedContext) {
6526 diag::err_using_decl_nested_name_specifier_is_current_class)
6531 Diag(SS.getRange().getBegin(),
6532 diag::err_using_decl_nested_name_specifier_is_not_base_class)
6533 << (NestedNameSpecifier*) SS.getScopeRep()
6534 << cast<CXXRecordDecl>(CurContext)
6542 // C++03 [namespace.udecl]p4:
6543 // A using-declaration used as a member-declaration shall refer
6544 // to a member of a base class of the class being defined [etc.].
6546 // Salient point: SS doesn't have to name a base class as long as
6547 // lookup only finds members from base classes. Therefore we can
6548 // diagnose here only if we can prove that that can't happen,
6549 // i.e. if the class hierarchies provably don't intersect.
6551 // TODO: it would be nice if "definitely valid" results were cached
6552 // in the UsingDecl and UsingShadowDecl so that these checks didn't
6553 // need to be repeated.
6556 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases;
6558 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) {
6559 UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
6560 Data->Bases.insert(Base);
6564 bool hasDependentBases(const CXXRecordDecl *Class) {
6565 return !Class->forallBases(collect, this);
6568 /// Returns true if the base is dependent or is one of the
6569 /// accumulated base classes.
6570 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) {
6571 UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
6572 return !Data->Bases.count(Base);
6575 bool mightShareBases(const CXXRecordDecl *Class) {
6576 return Bases.count(Class) || !Class->forallBases(doesNotContain, this);
6582 // Returns false if we find a dependent base.
6583 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext)))
6586 // Returns false if the class has a dependent base or if it or one
6587 // of its bases is present in the base set of the current context.
6588 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext)))
6591 Diag(SS.getRange().getBegin(),
6592 diag::err_using_decl_nested_name_specifier_is_not_base_class)
6593 << (NestedNameSpecifier*) SS.getScopeRep()
6594 << cast<CXXRecordDecl>(CurContext)
6600 Decl *Sema::ActOnAliasDeclaration(Scope *S,
6602 MultiTemplateParamsArg TemplateParamLists,
6603 SourceLocation UsingLoc,
6604 UnqualifiedId &Name,
6606 // Skip up to the relevant declaration scope.
6607 while (S->getFlags() & Scope::TemplateParamScope)
6609 assert((S->getFlags() & Scope::DeclScope) &&
6610 "got alias-declaration outside of declaration scope");
6612 if (Type.isInvalid())
6615 bool Invalid = false;
6616 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name);
6617 TypeSourceInfo *TInfo = 0;
6618 GetTypeFromParser(Type.get(), &TInfo);
6620 if (DiagnoseClassNameShadow(CurContext, NameInfo))
6623 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo,
6624 UPPC_DeclarationType)) {
6626 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
6627 TInfo->getTypeLoc().getBeginLoc());
6630 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration);
6631 LookupName(Previous, S);
6633 // Warn about shadowing the name of a template parameter.
6634 if (Previous.isSingleResult() &&
6635 Previous.getFoundDecl()->isTemplateParameter()) {
6636 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl());
6640 assert(Name.Kind == UnqualifiedId::IK_Identifier &&
6641 "name in alias declaration must be an identifier");
6642 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc,
6644 Name.Identifier, TInfo);
6646 NewTD->setAccess(AS);
6649 NewTD->setInvalidDecl();
6651 CheckTypedefForVariablyModifiedType(S, NewTD);
6652 Invalid |= NewTD->isInvalidDecl();
6654 bool Redeclaration = false;
6657 if (TemplateParamLists.size()) {
6658 TypeAliasTemplateDecl *OldDecl = 0;
6659 TemplateParameterList *OldTemplateParams = 0;
6661 if (TemplateParamLists.size() != 1) {
6662 Diag(UsingLoc, diag::err_alias_template_extra_headers)
6663 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(),
6664 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc());
6666 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0];
6668 // Only consider previous declarations in the same scope.
6669 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false,
6670 /*ExplicitInstantiationOrSpecialization*/false);
6671 if (!Previous.empty()) {
6672 Redeclaration = true;
6674 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>();
6675 if (!OldDecl && !Invalid) {
6676 Diag(UsingLoc, diag::err_redefinition_different_kind)
6679 NamedDecl *OldD = Previous.getRepresentativeDecl();
6680 if (OldD->getLocation().isValid())
6681 Diag(OldD->getLocation(), diag::note_previous_definition);
6686 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) {
6687 if (TemplateParameterListsAreEqual(TemplateParams,
6688 OldDecl->getTemplateParameters(),
6691 OldTemplateParams = OldDecl->getTemplateParameters();
6695 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl();
6697 !Context.hasSameType(OldTD->getUnderlyingType(),
6698 NewTD->getUnderlyingType())) {
6699 // FIXME: The C++0x standard does not clearly say this is ill-formed,
6700 // but we can't reasonably accept it.
6701 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef)
6702 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType();
6703 if (OldTD->getLocation().isValid())
6704 Diag(OldTD->getLocation(), diag::note_previous_definition);
6710 // Merge any previous default template arguments into our parameters,
6711 // and check the parameter list.
6712 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams,
6713 TPC_TypeAliasTemplate))
6716 TypeAliasTemplateDecl *NewDecl =
6717 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc,
6718 Name.Identifier, TemplateParams,
6721 NewDecl->setAccess(AS);
6724 NewDecl->setInvalidDecl();
6726 NewDecl->setPreviousDeclaration(OldDecl);
6730 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration);
6735 PushOnScopeChains(NewND, S);
6740 Decl *Sema::ActOnNamespaceAliasDef(Scope *S,
6741 SourceLocation NamespaceLoc,
6742 SourceLocation AliasLoc,
6743 IdentifierInfo *Alias,
6745 SourceLocation IdentLoc,
6746 IdentifierInfo *Ident) {
6748 // Lookup the namespace name.
6749 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName);
6750 LookupParsedName(R, S, &SS);
6752 // Check if we have a previous declaration with the same name.
6754 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName,
6756 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S))
6760 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) {
6761 // We already have an alias with the same name that points to the same
6762 // namespace, so don't create a new one.
6763 // FIXME: At some point, we'll want to create the (redundant)
6764 // declaration to maintain better source information.
6765 if (!R.isAmbiguous() && !R.empty() &&
6766 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl())))
6770 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition :
6771 diag::err_redefinition_different_kind;
6772 Diag(AliasLoc, DiagID) << Alias;
6773 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
6777 if (R.isAmbiguous())
6781 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) {
6782 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
6787 NamespaceAliasDecl *AliasDecl =
6788 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc,
6789 Alias, SS.getWithLocInContext(Context),
6790 IdentLoc, R.getFoundDecl());
6792 PushOnScopeChains(AliasDecl, S);
6797 /// \brief Scoped object used to handle the state changes required in Sema
6798 /// to implicitly define the body of a C++ member function;
6799 class ImplicitlyDefinedFunctionScope {
6801 Sema::ContextRAII SavedContext;
6804 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method)
6805 : S(S), SavedContext(S, Method)
6807 S.PushFunctionScope();
6808 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated);
6811 ~ImplicitlyDefinedFunctionScope() {
6812 S.PopExpressionEvaluationContext();
6813 S.PopFunctionScopeInfo();
6818 Sema::ImplicitExceptionSpecification
6819 Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) {
6820 // C++ [except.spec]p14:
6821 // An implicitly declared special member function (Clause 12) shall have an
6822 // exception-specification. [...]
6823 ImplicitExceptionSpecification ExceptSpec(*this);
6824 if (ClassDecl->isInvalidDecl())
6827 // Direct base-class constructors.
6828 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
6829 BEnd = ClassDecl->bases_end();
6831 if (B->isVirtual()) // Handled below.
6834 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
6835 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
6836 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
6837 // If this is a deleted function, add it anyway. This might be conformant
6838 // with the standard. This might not. I'm not sure. It might not matter.
6840 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
6844 // Virtual base-class constructors.
6845 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
6846 BEnd = ClassDecl->vbases_end();
6848 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
6849 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
6850 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
6851 // If this is a deleted function, add it anyway. This might be conformant
6852 // with the standard. This might not. I'm not sure. It might not matter.
6854 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
6858 // Field constructors.
6859 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
6860 FEnd = ClassDecl->field_end();
6862 if (F->hasInClassInitializer()) {
6863 if (Expr *E = F->getInClassInitializer())
6864 ExceptSpec.CalledExpr(E);
6865 else if (!F->isInvalidDecl())
6866 ExceptSpec.SetDelayed();
6867 } else if (const RecordType *RecordTy
6868 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) {
6869 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
6870 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl);
6871 // If this is a deleted function, add it anyway. This might be conformant
6872 // with the standard. This might not. I'm not sure. It might not matter.
6873 // In particular, the problem is that this function never gets called. It
6874 // might just be ill-formed because this function attempts to refer to
6875 // a deleted function here.
6877 ExceptSpec.CalledDecl(F->getLocation(), Constructor);
6884 CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor(
6885 CXXRecordDecl *ClassDecl) {
6886 // C++ [class.ctor]p5:
6887 // A default constructor for a class X is a constructor of class X
6888 // that can be called without an argument. If there is no
6889 // user-declared constructor for class X, a default constructor is
6890 // implicitly declared. An implicitly-declared default constructor
6891 // is an inline public member of its class.
6892 assert(!ClassDecl->hasUserDeclaredConstructor() &&
6893 "Should not build implicit default constructor!");
6895 ImplicitExceptionSpecification Spec =
6896 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl);
6897 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
6899 // Create the actual constructor declaration.
6900 CanQualType ClassType
6901 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
6902 SourceLocation ClassLoc = ClassDecl->getLocation();
6903 DeclarationName Name
6904 = Context.DeclarationNames.getCXXConstructorName(ClassType);
6905 DeclarationNameInfo NameInfo(Name, ClassLoc);
6906 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create(
6907 Context, ClassDecl, ClassLoc, NameInfo,
6908 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0,
6909 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true,
6910 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() &&
6911 getLangOpts().CPlusPlus0x);
6912 DefaultCon->setAccess(AS_public);
6913 DefaultCon->setDefaulted();
6914 DefaultCon->setImplicit();
6915 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor());
6917 // Note that we have declared this constructor.
6918 ++ASTContext::NumImplicitDefaultConstructorsDeclared;
6920 if (Scope *S = getScopeForContext(ClassDecl))
6921 PushOnScopeChains(DefaultCon, S, false);
6922 ClassDecl->addDecl(DefaultCon);
6924 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor))
6925 DefaultCon->setDeletedAsWritten();
6930 void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
6931 CXXConstructorDecl *Constructor) {
6932 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&
6933 !Constructor->doesThisDeclarationHaveABody() &&
6934 !Constructor->isDeleted()) &&
6935 "DefineImplicitDefaultConstructor - call it for implicit default ctor");
6937 CXXRecordDecl *ClassDecl = Constructor->getParent();
6938 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor");
6940 ImplicitlyDefinedFunctionScope Scope(*this, Constructor);
6941 DiagnosticErrorTrap Trap(Diags);
6942 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) ||
6943 Trap.hasErrorOccurred()) {
6944 Diag(CurrentLocation, diag::note_member_synthesized_at)
6945 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl);
6946 Constructor->setInvalidDecl();
6950 SourceLocation Loc = Constructor->getLocation();
6951 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc));
6953 Constructor->setUsed();
6954 MarkVTableUsed(CurrentLocation, ClassDecl);
6956 if (ASTMutationListener *L = getASTMutationListener()) {
6957 L->CompletedImplicitDefinition(Constructor);
6961 /// Get any existing defaulted default constructor for the given class. Do not
6962 /// implicitly define one if it does not exist.
6963 static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self,
6965 ASTContext &Context = Self.Context;
6966 QualType ClassType = Context.getTypeDeclType(D);
6967 DeclarationName ConstructorName
6968 = Context.DeclarationNames.getCXXConstructorName(
6969 Context.getCanonicalType(ClassType.getUnqualifiedType()));
6971 DeclContext::lookup_const_iterator Con, ConEnd;
6972 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName);
6973 Con != ConEnd; ++Con) {
6974 // A function template cannot be defaulted.
6975 if (isa<FunctionTemplateDecl>(*Con))
6978 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con);
6979 if (Constructor->isDefaultConstructor())
6980 return Constructor->isDefaulted() ? Constructor : 0;
6985 void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) {
6987 AdjustDeclIfTemplate(D);
6989 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D);
6990 CXXConstructorDecl *CtorDecl
6991 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl);
6993 if (!CtorDecl) return;
6995 // Compute the exception specification for the default constructor.
6996 const FunctionProtoType *CtorTy =
6997 CtorDecl->getType()->castAs<FunctionProtoType>();
6998 if (CtorTy->getExceptionSpecType() == EST_Delayed) {
6999 // FIXME: Don't do this unless the exception spec is needed.
7000 ImplicitExceptionSpecification Spec =
7001 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl);
7002 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
7003 assert(EPI.ExceptionSpecType != EST_Delayed);
7005 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI));
7008 // If the default constructor is explicitly defaulted, checking the exception
7009 // specification is deferred until now.
7010 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() &&
7011 !ClassDecl->isDependentType())
7012 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl);
7015 void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) {
7016 // We start with an initial pass over the base classes to collect those that
7017 // inherit constructors from. If there are none, we can forgo all further
7019 typedef SmallVector<const RecordType *, 4> BasesVector;
7020 BasesVector BasesToInheritFrom;
7021 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(),
7022 BaseE = ClassDecl->bases_end();
7023 BaseIt != BaseE; ++BaseIt) {
7024 if (BaseIt->getInheritConstructors()) {
7025 QualType Base = BaseIt->getType();
7026 if (Base->isDependentType()) {
7027 // If we inherit constructors from anything that is dependent, just
7028 // abort processing altogether. We'll get another chance for the
7032 BasesToInheritFrom.push_back(Base->castAs<RecordType>());
7035 if (BasesToInheritFrom.empty())
7038 // Now collect the constructors that we already have in the current class.
7039 // Those take precedence over inherited constructors.
7040 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...]
7041 // unless there is a user-declared constructor with the same signature in
7042 // the class where the using-declaration appears.
7043 llvm::SmallSet<const Type *, 8> ExistingConstructors;
7044 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(),
7045 CtorE = ClassDecl->ctor_end();
7046 CtorIt != CtorE; ++CtorIt) {
7047 ExistingConstructors.insert(
7048 Context.getCanonicalType(CtorIt->getType()).getTypePtr());
7051 DeclarationName CreatedCtorName =
7052 Context.DeclarationNames.getCXXConstructorName(
7053 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified());
7055 // Now comes the true work.
7056 // First, we keep a map from constructor types to the base that introduced
7057 // them. Needed for finding conflicting constructors. We also keep the
7058 // actually inserted declarations in there, for pretty diagnostics.
7059 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo;
7060 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap;
7061 ConstructorToSourceMap InheritedConstructors;
7062 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(),
7063 BaseE = BasesToInheritFrom.end();
7064 BaseIt != BaseE; ++BaseIt) {
7065 const RecordType *Base = *BaseIt;
7066 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified();
7067 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl());
7068 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(),
7069 CtorE = BaseDecl->ctor_end();
7070 CtorIt != CtorE; ++CtorIt) {
7071 // Find the using declaration for inheriting this base's constructors.
7072 // FIXME: Don't perform name lookup just to obtain a source location!
7073 DeclarationName Name =
7074 Context.DeclarationNames.getCXXConstructorName(CanonicalBase);
7075 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName);
7076 LookupQualifiedName(Result, CurContext);
7077 UsingDecl *UD = Result.getAsSingle<UsingDecl>();
7078 SourceLocation UsingLoc = UD ? UD->getLocation() :
7079 ClassDecl->getLocation();
7081 // C++0x [class.inhctor]p1: The candidate set of inherited constructors
7082 // from the class X named in the using-declaration consists of actual
7083 // constructors and notional constructors that result from the
7084 // transformation of defaulted parameters as follows:
7085 // - all non-template default constructors of X, and
7086 // - for each non-template constructor of X that has at least one
7087 // parameter with a default argument, the set of constructors that
7088 // results from omitting any ellipsis parameter specification and
7089 // successively omitting parameters with a default argument from the
7090 // end of the parameter-type-list.
7091 CXXConstructorDecl *BaseCtor = *CtorIt;
7092 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor();
7093 const FunctionProtoType *BaseCtorType =
7094 BaseCtor->getType()->getAs<FunctionProtoType>();
7096 for (unsigned params = BaseCtor->getMinRequiredArguments(),
7097 maxParams = BaseCtor->getNumParams();
7098 params <= maxParams; ++params) {
7099 // Skip default constructors. They're never inherited.
7102 // Skip copy and move constructors for the same reason.
7103 if (CanBeCopyOrMove && params == 1)
7106 // Build up a function type for this particular constructor.
7107 // FIXME: The working paper does not consider that the exception spec
7108 // for the inheriting constructor might be larger than that of the
7109 // source. This code doesn't yet, either. When it does, this code will
7110 // need to be delayed until after exception specifications and in-class
7111 // member initializers are attached.
7112 const Type *NewCtorType;
7113 if (params == maxParams)
7114 NewCtorType = BaseCtorType;
7116 SmallVector<QualType, 16> Args;
7117 for (unsigned i = 0; i < params; ++i) {
7118 Args.push_back(BaseCtorType->getArgType(i));
7120 FunctionProtoType::ExtProtoInfo ExtInfo =
7121 BaseCtorType->getExtProtoInfo();
7122 ExtInfo.Variadic = false;
7123 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(),
7124 Args.data(), params, ExtInfo)
7127 const Type *CanonicalNewCtorType =
7128 Context.getCanonicalType(NewCtorType);
7130 // Now that we have the type, first check if the class already has a
7131 // constructor with this signature.
7132 if (ExistingConstructors.count(CanonicalNewCtorType))
7135 // Then we check if we have already declared an inherited constructor
7136 // with this signature.
7137 std::pair<ConstructorToSourceMap::iterator, bool> result =
7138 InheritedConstructors.insert(std::make_pair(
7139 CanonicalNewCtorType,
7140 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0)));
7141 if (!result.second) {
7142 // Already in the map. If it came from a different class, that's an
7143 // error. Not if it's from the same.
7144 CanQualType PreviousBase = result.first->second.first;
7145 if (CanonicalBase != PreviousBase) {
7146 const CXXConstructorDecl *PrevCtor = result.first->second.second;
7147 const CXXConstructorDecl *PrevBaseCtor =
7148 PrevCtor->getInheritedConstructor();
7149 assert(PrevBaseCtor && "Conflicting constructor was not inherited");
7151 Diag(UsingLoc, diag::err_using_decl_constructor_conflict);
7152 Diag(BaseCtor->getLocation(),
7153 diag::note_using_decl_constructor_conflict_current_ctor);
7154 Diag(PrevBaseCtor->getLocation(),
7155 diag::note_using_decl_constructor_conflict_previous_ctor);
7156 Diag(PrevCtor->getLocation(),
7157 diag::note_using_decl_constructor_conflict_previous_using);
7162 // OK, we're there, now add the constructor.
7163 // C++0x [class.inhctor]p8: [...] that would be performed by a
7164 // user-written inline constructor [...]
7165 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc);
7166 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create(
7167 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0),
7168 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true,
7169 /*ImplicitlyDeclared=*/true,
7170 // FIXME: Due to a defect in the standard, we treat inherited
7171 // constructors as constexpr even if that makes them ill-formed.
7172 /*Constexpr=*/BaseCtor->isConstexpr());
7173 NewCtor->setAccess(BaseCtor->getAccess());
7175 // Build up the parameter decls and add them.
7176 SmallVector<ParmVarDecl *, 16> ParamDecls;
7177 for (unsigned i = 0; i < params; ++i) {
7178 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor,
7180 /*IdentifierInfo=*/0,
7181 BaseCtorType->getArgType(i),
7182 /*TInfo=*/0, SC_None,
7183 SC_None, /*DefaultArg=*/0));
7185 NewCtor->setParams(ParamDecls);
7186 NewCtor->setInheritedConstructor(BaseCtor);
7188 ClassDecl->addDecl(NewCtor);
7189 result.first->second.second = NewCtor;
7195 Sema::ImplicitExceptionSpecification
7196 Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) {
7197 // C++ [except.spec]p14:
7198 // An implicitly declared special member function (Clause 12) shall have
7199 // an exception-specification.
7200 ImplicitExceptionSpecification ExceptSpec(*this);
7201 if (ClassDecl->isInvalidDecl())
7204 // Direct base-class destructors.
7205 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
7206 BEnd = ClassDecl->bases_end();
7208 if (B->isVirtual()) // Handled below.
7211 if (const RecordType *BaseType = B->getType()->getAs<RecordType>())
7212 ExceptSpec.CalledDecl(B->getLocStart(),
7213 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl())));
7216 // Virtual base-class destructors.
7217 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
7218 BEnd = ClassDecl->vbases_end();
7220 if (const RecordType *BaseType = B->getType()->getAs<RecordType>())
7221 ExceptSpec.CalledDecl(B->getLocStart(),
7222 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl())));
7225 // Field destructors.
7226 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
7227 FEnd = ClassDecl->field_end();
7229 if (const RecordType *RecordTy
7230 = Context.getBaseElementType(F->getType())->getAs<RecordType>())
7231 ExceptSpec.CalledDecl(F->getLocation(),
7232 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl())));
7238 CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) {
7239 // C++ [class.dtor]p2:
7240 // If a class has no user-declared destructor, a destructor is
7241 // declared implicitly. An implicitly-declared destructor is an
7242 // inline public member of its class.
7244 ImplicitExceptionSpecification Spec =
7245 ComputeDefaultedDtorExceptionSpec(ClassDecl);
7246 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
7248 // Create the actual destructor declaration.
7249 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI);
7251 CanQualType ClassType
7252 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
7253 SourceLocation ClassLoc = ClassDecl->getLocation();
7254 DeclarationName Name
7255 = Context.DeclarationNames.getCXXDestructorName(ClassType);
7256 DeclarationNameInfo NameInfo(Name, ClassLoc);
7257 CXXDestructorDecl *Destructor
7258 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0,
7260 /*isImplicitlyDeclared=*/true);
7261 Destructor->setAccess(AS_public);
7262 Destructor->setDefaulted();
7263 Destructor->setImplicit();
7264 Destructor->setTrivial(ClassDecl->hasTrivialDestructor());
7266 // Note that we have declared this destructor.
7267 ++ASTContext::NumImplicitDestructorsDeclared;
7269 // Introduce this destructor into its scope.
7270 if (Scope *S = getScopeForContext(ClassDecl))
7271 PushOnScopeChains(Destructor, S, false);
7272 ClassDecl->addDecl(Destructor);
7274 // This could be uniqued if it ever proves significant.
7275 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty));
7277 AddOverriddenMethods(ClassDecl, Destructor);
7279 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor))
7280 Destructor->setDeletedAsWritten();
7285 void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation,
7286 CXXDestructorDecl *Destructor) {
7287 assert((Destructor->isDefaulted() &&
7288 !Destructor->doesThisDeclarationHaveABody() &&
7289 !Destructor->isDeleted()) &&
7290 "DefineImplicitDestructor - call it for implicit default dtor");
7291 CXXRecordDecl *ClassDecl = Destructor->getParent();
7292 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor");
7294 if (Destructor->isInvalidDecl())
7297 ImplicitlyDefinedFunctionScope Scope(*this, Destructor);
7299 DiagnosticErrorTrap Trap(Diags);
7300 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
7301 Destructor->getParent());
7303 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) {
7304 Diag(CurrentLocation, diag::note_member_synthesized_at)
7305 << CXXDestructor << Context.getTagDeclType(ClassDecl);
7307 Destructor->setInvalidDecl();
7311 SourceLocation Loc = Destructor->getLocation();
7312 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc));
7313 Destructor->setImplicitlyDefined(true);
7314 Destructor->setUsed();
7315 MarkVTableUsed(CurrentLocation, ClassDecl);
7317 if (ASTMutationListener *L = getASTMutationListener()) {
7318 L->CompletedImplicitDefinition(Destructor);
7322 void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl,
7323 CXXDestructorDecl *destructor) {
7324 // C++11 [class.dtor]p3:
7325 // A declaration of a destructor that does not have an exception-
7326 // specification is implicitly considered to have the same exception-
7327 // specification as an implicit declaration.
7328 const FunctionProtoType *dtorType = destructor->getType()->
7329 getAs<FunctionProtoType>();
7330 if (dtorType->hasExceptionSpec())
7333 ImplicitExceptionSpecification exceptSpec =
7334 ComputeDefaultedDtorExceptionSpec(classDecl);
7336 // Replace the destructor's type, building off the existing one. Fortunately,
7337 // the only thing of interest in the destructor type is its extended info.
7338 // The return and arguments are fixed.
7339 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo();
7340 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType();
7341 epi.NumExceptions = exceptSpec.size();
7342 epi.Exceptions = exceptSpec.data();
7343 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi);
7345 destructor->setType(ty);
7347 // FIXME: If the destructor has a body that could throw, and the newly created
7348 // spec doesn't allow exceptions, we should emit a warning, because this
7349 // change in behavior can break conforming C++03 programs at runtime.
7350 // However, we don't have a body yet, so it needs to be done somewhere else.
7353 /// \brief Builds a statement that copies/moves the given entity from \p From to
7356 /// This routine is used to copy/move the members of a class with an
7357 /// implicitly-declared copy/move assignment operator. When the entities being
7358 /// copied are arrays, this routine builds for loops to copy them.
7360 /// \param S The Sema object used for type-checking.
7362 /// \param Loc The location where the implicit copy/move is being generated.
7364 /// \param T The type of the expressions being copied/moved. Both expressions
7365 /// must have this type.
7367 /// \param To The expression we are copying/moving to.
7369 /// \param From The expression we are copying/moving from.
7371 /// \param CopyingBaseSubobject Whether we're copying/moving a base subobject.
7372 /// Otherwise, it's a non-static member subobject.
7374 /// \param Copying Whether we're copying or moving.
7376 /// \param Depth Internal parameter recording the depth of the recursion.
7378 /// \returns A statement or a loop that copies the expressions.
7380 BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T,
7381 Expr *To, Expr *From,
7382 bool CopyingBaseSubobject, bool Copying,
7383 unsigned Depth = 0) {
7384 // C++0x [class.copy]p28:
7385 // Each subobject is assigned in the manner appropriate to its type:
7387 // - if the subobject is of class type, as if by a call to operator= with
7388 // the subobject as the object expression and the corresponding
7389 // subobject of x as a single function argument (as if by explicit
7390 // qualification; that is, ignoring any possible virtual overriding
7391 // functions in more derived classes);
7392 if (const RecordType *RecordTy = T->getAs<RecordType>()) {
7393 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
7395 // Look for operator=.
7396 DeclarationName Name
7397 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal);
7398 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName);
7399 S.LookupQualifiedName(OpLookup, ClassDecl, false);
7401 // Filter out any result that isn't a copy/move-assignment operator.
7402 LookupResult::Filter F = OpLookup.makeFilter();
7403 while (F.hasNext()) {
7404 NamedDecl *D = F.next();
7405 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
7406 if (Method->isCopyAssignmentOperator() ||
7407 (!Copying && Method->isMoveAssignmentOperator()))
7414 // Suppress the protected check (C++ [class.protected]) for each of the
7415 // assignment operators we found. This strange dance is required when
7416 // we're assigning via a base classes's copy-assignment operator. To
7417 // ensure that we're getting the right base class subobject (without
7418 // ambiguities), we need to cast "this" to that subobject type; to
7419 // ensure that we don't go through the virtual call mechanism, we need
7420 // to qualify the operator= name with the base class (see below). However,
7421 // this means that if the base class has a protected copy assignment
7422 // operator, the protected member access check will fail. So, we
7423 // rewrite "protected" access to "public" access in this case, since we
7424 // know by construction that we're calling from a derived class.
7425 if (CopyingBaseSubobject) {
7426 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end();
7428 if (L.getAccess() == AS_protected)
7429 L.setAccess(AS_public);
7433 // Create the nested-name-specifier that will be used to qualify the
7434 // reference to operator=; this is required to suppress the virtual
7437 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr());
7438 SS.MakeTrivial(S.Context,
7439 NestedNameSpecifier::Create(S.Context, 0, false,
7443 // Create the reference to operator=.
7444 ExprResult OpEqualRef
7445 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS,
7446 /*TemplateKWLoc=*/SourceLocation(),
7447 /*FirstQualifierInScope=*/0,
7450 /*SuppressQualifierCheck=*/true);
7451 if (OpEqualRef.isInvalid())
7454 // Build the call to the assignment operator.
7456 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0,
7457 OpEqualRef.takeAs<Expr>(),
7458 Loc, &From, 1, Loc);
7459 if (Call.isInvalid())
7462 return S.Owned(Call.takeAs<Stmt>());
7465 // - if the subobject is of scalar type, the built-in assignment
7466 // operator is used.
7467 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T);
7469 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From);
7470 if (Assignment.isInvalid())
7473 return S.Owned(Assignment.takeAs<Stmt>());
7476 // - if the subobject is an array, each element is assigned, in the
7477 // manner appropriate to the element type;
7479 // Construct a loop over the array bounds, e.g.,
7481 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0)
7483 // that will copy each of the array elements.
7484 QualType SizeType = S.Context.getSizeType();
7486 // Create the iteration variable.
7487 IdentifierInfo *IterationVarName = 0;
7490 llvm::raw_svector_ostream OS(Str);
7491 OS << "__i" << Depth;
7492 IterationVarName = &S.Context.Idents.get(OS.str());
7494 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc,
7495 IterationVarName, SizeType,
7496 S.Context.getTrivialTypeSourceInfo(SizeType, Loc),
7499 // Initialize the iteration variable to zero.
7500 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0);
7501 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc));
7503 // Create a reference to the iteration variable; we'll use this several
7504 // times throughout.
7505 Expr *IterationVarRef
7506 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take();
7507 assert(IterationVarRef && "Reference to invented variable cannot fail!");
7508 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take();
7509 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!");
7511 // Create the DeclStmt that holds the iteration variable.
7512 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc);
7514 // Create the comparison against the array bound.
7516 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType));
7518 = new (S.Context) BinaryOperator(IterationVarRefRVal,
7519 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc),
7520 BO_NE, S.Context.BoolTy,
7521 VK_RValue, OK_Ordinary, Loc);
7523 // Create the pre-increment of the iteration variable.
7525 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType,
7526 VK_LValue, OK_Ordinary, Loc);
7528 // Subscript the "from" and "to" expressions with the iteration variable.
7529 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc,
7530 IterationVarRefRVal,
7532 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc,
7533 IterationVarRefRVal,
7535 if (!Copying) // Cast to rvalue
7536 From = CastForMoving(S, From);
7538 // Build the copy/move for an individual element of the array.
7539 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(),
7540 To, From, CopyingBaseSubobject,
7541 Copying, Depth + 1);
7542 if (Copy.isInvalid())
7545 // Construct the loop that copies all elements of this array.
7546 return S.ActOnForStmt(Loc, Loc, InitStmt,
7547 S.MakeFullExpr(Comparison),
7548 0, S.MakeFullExpr(Increment),
7552 std::pair<Sema::ImplicitExceptionSpecification, bool>
7553 Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst(
7554 CXXRecordDecl *ClassDecl) {
7555 if (ClassDecl->isInvalidDecl())
7556 return std::make_pair(ImplicitExceptionSpecification(*this), false);
7558 // C++ [class.copy]p10:
7559 // If the class definition does not explicitly declare a copy
7560 // assignment operator, one is declared implicitly.
7561 // The implicitly-defined copy assignment operator for a class X
7562 // will have the form
7564 // X& X::operator=(const X&)
7567 bool HasConstCopyAssignment = true;
7569 // -- each direct base class B of X has a copy assignment operator
7570 // whose parameter is of type const B&, const volatile B& or B,
7572 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
7573 BaseEnd = ClassDecl->bases_end();
7574 HasConstCopyAssignment && Base != BaseEnd; ++Base) {
7575 // We'll handle this below
7576 if (LangOpts.CPlusPlus0x && Base->isVirtual())
7579 assert(!Base->getType()->isDependentType() &&
7580 "Cannot generate implicit members for class with dependent bases.");
7581 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl();
7582 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0,
7583 &HasConstCopyAssignment);
7586 // In C++11, the above citation has "or virtual" added
7587 if (LangOpts.CPlusPlus0x) {
7588 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
7589 BaseEnd = ClassDecl->vbases_end();
7590 HasConstCopyAssignment && Base != BaseEnd; ++Base) {
7591 assert(!Base->getType()->isDependentType() &&
7592 "Cannot generate implicit members for class with dependent bases.");
7593 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl();
7594 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0,
7595 &HasConstCopyAssignment);
7599 // -- for all the nonstatic data members of X that are of a class
7600 // type M (or array thereof), each such class type has a copy
7601 // assignment operator whose parameter is of type const M&,
7602 // const volatile M& or M.
7603 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
7604 FieldEnd = ClassDecl->field_end();
7605 HasConstCopyAssignment && Field != FieldEnd;
7607 QualType FieldType = Context.getBaseElementType((*Field)->getType());
7608 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
7609 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0,
7610 &HasConstCopyAssignment);
7614 // Otherwise, the implicitly declared copy assignment operator will
7617 // X& X::operator=(X&)
7619 // C++ [except.spec]p14:
7620 // An implicitly declared special member function (Clause 12) shall have an
7621 // exception-specification. [...]
7623 // It is unspecified whether or not an implicit copy assignment operator
7624 // attempts to deduplicate calls to assignment operators of virtual bases are
7625 // made. As such, this exception specification is effectively unspecified.
7626 // Based on a similar decision made for constness in C++0x, we're erring on
7627 // the side of assuming such calls to be made regardless of whether they
7629 ImplicitExceptionSpecification ExceptSpec(*this);
7630 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0;
7631 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
7632 BaseEnd = ClassDecl->bases_end();
7633 Base != BaseEnd; ++Base) {
7634 if (Base->isVirtual())
7637 CXXRecordDecl *BaseClassDecl
7638 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
7639 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl,
7640 ArgQuals, false, 0))
7641 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign);
7644 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
7645 BaseEnd = ClassDecl->vbases_end();
7646 Base != BaseEnd; ++Base) {
7647 CXXRecordDecl *BaseClassDecl
7648 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
7649 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl,
7650 ArgQuals, false, 0))
7651 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign);
7654 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
7655 FieldEnd = ClassDecl->field_end();
7658 QualType FieldType = Context.getBaseElementType((*Field)->getType());
7659 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
7660 if (CXXMethodDecl *CopyAssign =
7661 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0))
7662 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign);
7666 return std::make_pair(ExceptSpec, HasConstCopyAssignment);
7669 CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) {
7670 // Note: The following rules are largely analoguous to the copy
7671 // constructor rules. Note that virtual bases are not taken into account
7672 // for determining the argument type of the operator. Note also that
7673 // operators taking an object instead of a reference are allowed.
7675 ImplicitExceptionSpecification Spec(*this);
7677 llvm::tie(Spec, Const) =
7678 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl);
7680 QualType ArgType = Context.getTypeDeclType(ClassDecl);
7681 QualType RetType = Context.getLValueReferenceType(ArgType);
7683 ArgType = ArgType.withConst();
7684 ArgType = Context.getLValueReferenceType(ArgType);
7686 // An implicitly-declared copy assignment operator is an inline public
7687 // member of its class.
7688 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
7689 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
7690 SourceLocation ClassLoc = ClassDecl->getLocation();
7691 DeclarationNameInfo NameInfo(Name, ClassLoc);
7692 CXXMethodDecl *CopyAssignment
7693 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo,
7694 Context.getFunctionType(RetType, &ArgType, 1, EPI),
7695 /*TInfo=*/0, /*isStatic=*/false,
7696 /*StorageClassAsWritten=*/SC_None,
7697 /*isInline=*/true, /*isConstexpr=*/false,
7699 CopyAssignment->setAccess(AS_public);
7700 CopyAssignment->setDefaulted();
7701 CopyAssignment->setImplicit();
7702 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment());
7704 // Add the parameter to the operator.
7705 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment,
7706 ClassLoc, ClassLoc, /*Id=*/0,
7707 ArgType, /*TInfo=*/0,
7710 CopyAssignment->setParams(FromParam);
7712 // Note that we have added this copy-assignment operator.
7713 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared;
7715 if (Scope *S = getScopeForContext(ClassDecl))
7716 PushOnScopeChains(CopyAssignment, S, false);
7717 ClassDecl->addDecl(CopyAssignment);
7719 // C++0x [class.copy]p19:
7720 // .... If the class definition does not explicitly declare a copy
7721 // assignment operator, there is no user-declared move constructor, and
7722 // there is no user-declared move assignment operator, a copy assignment
7723 // operator is implicitly declared as defaulted.
7724 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment))
7725 CopyAssignment->setDeletedAsWritten();
7727 AddOverriddenMethods(ClassDecl, CopyAssignment);
7728 return CopyAssignment;
7731 void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation,
7732 CXXMethodDecl *CopyAssignOperator) {
7733 assert((CopyAssignOperator->isDefaulted() &&
7734 CopyAssignOperator->isOverloadedOperator() &&
7735 CopyAssignOperator->getOverloadedOperator() == OO_Equal &&
7736 !CopyAssignOperator->doesThisDeclarationHaveABody() &&
7737 !CopyAssignOperator->isDeleted()) &&
7738 "DefineImplicitCopyAssignment called for wrong function");
7740 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent();
7742 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) {
7743 CopyAssignOperator->setInvalidDecl();
7747 CopyAssignOperator->setUsed();
7749 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator);
7750 DiagnosticErrorTrap Trap(Diags);
7752 // C++0x [class.copy]p30:
7753 // The implicitly-defined or explicitly-defaulted copy assignment operator
7754 // for a non-union class X performs memberwise copy assignment of its
7755 // subobjects. The direct base classes of X are assigned first, in the
7756 // order of their declaration in the base-specifier-list, and then the
7757 // immediate non-static data members of X are assigned, in the order in
7758 // which they were declared in the class definition.
7760 // The statements that form the synthesized function body.
7761 ASTOwningVector<Stmt*> Statements(*this);
7763 // The parameter for the "other" object, which we are copying from.
7764 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0);
7765 Qualifiers OtherQuals = Other->getType().getQualifiers();
7766 QualType OtherRefType = Other->getType();
7767 if (const LValueReferenceType *OtherRef
7768 = OtherRefType->getAs<LValueReferenceType>()) {
7769 OtherRefType = OtherRef->getPointeeType();
7770 OtherQuals = OtherRefType.getQualifiers();
7773 // Our location for everything implicitly-generated.
7774 SourceLocation Loc = CopyAssignOperator->getLocation();
7776 // Construct a reference to the "other" object. We'll be using this
7777 // throughout the generated ASTs.
7778 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take();
7779 assert(OtherRef && "Reference to parameter cannot fail!");
7781 // Construct the "this" pointer. We'll be using this throughout the generated
7783 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>();
7784 assert(This && "Reference to this cannot fail!");
7786 // Assign base classes.
7787 bool Invalid = false;
7788 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
7789 E = ClassDecl->bases_end(); Base != E; ++Base) {
7790 // Form the assignment:
7791 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other));
7792 QualType BaseType = Base->getType().getUnqualifiedType();
7793 if (!BaseType->isRecordType()) {
7798 CXXCastPath BasePath;
7799 BasePath.push_back(Base);
7801 // Construct the "from" expression, which is an implicit cast to the
7802 // appropriately-qualified base type.
7803 Expr *From = OtherRef;
7804 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals),
7805 CK_UncheckedDerivedToBase,
7806 VK_LValue, &BasePath).take();
7808 // Dereference "this".
7809 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This);
7811 // Implicitly cast "this" to the appropriately-qualified base type.
7812 To = ImpCastExprToType(To.take(),
7813 Context.getCVRQualifiedType(BaseType,
7814 CopyAssignOperator->getTypeQualifiers()),
7815 CK_UncheckedDerivedToBase,
7816 VK_LValue, &BasePath);
7819 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType,
7821 /*CopyingBaseSubobject=*/true,
7823 if (Copy.isInvalid()) {
7824 Diag(CurrentLocation, diag::note_member_synthesized_at)
7825 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
7826 CopyAssignOperator->setInvalidDecl();
7830 // Success! Record the copy.
7831 Statements.push_back(Copy.takeAs<Expr>());
7834 // \brief Reference to the __builtin_memcpy function.
7835 Expr *BuiltinMemCpyRef = 0;
7836 // \brief Reference to the __builtin_objc_memmove_collectable function.
7837 Expr *CollectableMemCpyRef = 0;
7839 // Assign non-static members.
7840 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
7841 FieldEnd = ClassDecl->field_end();
7842 Field != FieldEnd; ++Field) {
7843 if (Field->isUnnamedBitfield())
7846 // Check for members of reference type; we can't copy those.
7847 if (Field->getType()->isReferenceType()) {
7848 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
7849 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
7850 Diag(Field->getLocation(), diag::note_declared_at);
7851 Diag(CurrentLocation, diag::note_member_synthesized_at)
7852 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
7857 // Check for members of const-qualified, non-class type.
7858 QualType BaseType = Context.getBaseElementType(Field->getType());
7859 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
7860 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
7861 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
7862 Diag(Field->getLocation(), diag::note_declared_at);
7863 Diag(CurrentLocation, diag::note_member_synthesized_at)
7864 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
7869 // Suppress assigning zero-width bitfields.
7870 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0)
7873 QualType FieldType = Field->getType().getNonReferenceType();
7874 if (FieldType->isIncompleteArrayType()) {
7875 assert(ClassDecl->hasFlexibleArrayMember() &&
7876 "Incomplete array type is not valid");
7880 // Build references to the field in the object we're copying from and to.
7881 CXXScopeSpec SS; // Intentionally empty
7882 LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
7884 MemberLookup.addDecl(*Field);
7885 MemberLookup.resolveKind();
7886 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType,
7887 Loc, /*IsArrow=*/false,
7888 SS, SourceLocation(), 0,
7890 ExprResult To = BuildMemberReferenceExpr(This, This->getType(),
7891 Loc, /*IsArrow=*/true,
7892 SS, SourceLocation(), 0,
7894 assert(!From.isInvalid() && "Implicit field reference cannot fail");
7895 assert(!To.isInvalid() && "Implicit field reference cannot fail");
7897 // If the field should be copied with __builtin_memcpy rather than via
7898 // explicit assignments, do so. This optimization only applies for arrays
7899 // of scalars and arrays of class type with trivial copy-assignment
7901 if (FieldType->isArrayType() && !FieldType.isVolatileQualified()
7902 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) {
7903 // Compute the size of the memory buffer to be copied.
7904 QualType SizeType = Context.getSizeType();
7905 llvm::APInt Size(Context.getTypeSize(SizeType),
7906 Context.getTypeSizeInChars(BaseType).getQuantity());
7907 for (const ConstantArrayType *Array
7908 = Context.getAsConstantArrayType(FieldType);
7910 Array = Context.getAsConstantArrayType(Array->getElementType())) {
7911 llvm::APInt ArraySize
7912 = Array->getSize().zextOrTrunc(Size.getBitWidth());
7916 // Take the address of the field references for "from" and "to".
7917 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get());
7918 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get());
7920 bool NeedsCollectableMemCpy =
7921 (BaseType->isRecordType() &&
7922 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember());
7924 if (NeedsCollectableMemCpy) {
7925 if (!CollectableMemCpyRef) {
7926 // Create a reference to the __builtin_objc_memmove_collectable function.
7927 LookupResult R(*this,
7928 &Context.Idents.get("__builtin_objc_memmove_collectable"),
7929 Loc, LookupOrdinaryName);
7930 LookupName(R, TUScope, true);
7932 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>();
7933 if (!CollectableMemCpy) {
7934 // Something went horribly wrong earlier, and we will have
7935 // complained about it.
7940 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy,
7941 CollectableMemCpy->getType(),
7942 VK_LValue, Loc, 0).take();
7943 assert(CollectableMemCpyRef && "Builtin reference cannot fail");
7946 // Create a reference to the __builtin_memcpy builtin function.
7947 else if (!BuiltinMemCpyRef) {
7948 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc,
7949 LookupOrdinaryName);
7950 LookupName(R, TUScope, true);
7952 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>();
7953 if (!BuiltinMemCpy) {
7954 // Something went horribly wrong earlier, and we will have complained
7960 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy,
7961 BuiltinMemCpy->getType(),
7962 VK_LValue, Loc, 0).take();
7963 assert(BuiltinMemCpyRef && "Builtin reference cannot fail");
7966 ASTOwningVector<Expr*> CallArgs(*this);
7967 CallArgs.push_back(To.takeAs<Expr>());
7968 CallArgs.push_back(From.takeAs<Expr>());
7969 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc));
7970 ExprResult Call = ExprError();
7971 if (NeedsCollectableMemCpy)
7972 Call = ActOnCallExpr(/*Scope=*/0,
7973 CollectableMemCpyRef,
7974 Loc, move_arg(CallArgs),
7977 Call = ActOnCallExpr(/*Scope=*/0,
7979 Loc, move_arg(CallArgs),
7982 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!");
7983 Statements.push_back(Call.takeAs<Expr>());
7987 // Build the copy of this field.
7988 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType,
7989 To.get(), From.get(),
7990 /*CopyingBaseSubobject=*/false,
7992 if (Copy.isInvalid()) {
7993 Diag(CurrentLocation, diag::note_member_synthesized_at)
7994 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
7995 CopyAssignOperator->setInvalidDecl();
7999 // Success! Record the copy.
8000 Statements.push_back(Copy.takeAs<Stmt>());
8004 // Add a "return *this;"
8005 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This);
8007 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get());
8008 if (Return.isInvalid())
8011 Statements.push_back(Return.takeAs<Stmt>());
8013 if (Trap.hasErrorOccurred()) {
8014 Diag(CurrentLocation, diag::note_member_synthesized_at)
8015 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
8022 CopyAssignOperator->setInvalidDecl();
8028 CompoundScopeRAII CompoundScope(*this);
8029 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements),
8030 /*isStmtExpr=*/false);
8031 assert(!Body.isInvalid() && "Compound statement creation cannot fail");
8033 CopyAssignOperator->setBody(Body.takeAs<Stmt>());
8035 if (ASTMutationListener *L = getASTMutationListener()) {
8036 L->CompletedImplicitDefinition(CopyAssignOperator);
8040 Sema::ImplicitExceptionSpecification
8041 Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) {
8042 ImplicitExceptionSpecification ExceptSpec(*this);
8044 if (ClassDecl->isInvalidDecl())
8047 // C++0x [except.spec]p14:
8048 // An implicitly declared special member function (Clause 12) shall have an
8049 // exception-specification. [...]
8051 // It is unspecified whether or not an implicit move assignment operator
8052 // attempts to deduplicate calls to assignment operators of virtual bases are
8053 // made. As such, this exception specification is effectively unspecified.
8054 // Based on a similar decision made for constness in C++0x, we're erring on
8055 // the side of assuming such calls to be made regardless of whether they
8057 // Note that a move constructor is not implicitly declared when there are
8058 // virtual bases, but it can still be user-declared and explicitly defaulted.
8059 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
8060 BaseEnd = ClassDecl->bases_end();
8061 Base != BaseEnd; ++Base) {
8062 if (Base->isVirtual())
8065 CXXRecordDecl *BaseClassDecl
8066 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8067 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl,
8069 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign);
8072 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
8073 BaseEnd = ClassDecl->vbases_end();
8074 Base != BaseEnd; ++Base) {
8075 CXXRecordDecl *BaseClassDecl
8076 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8077 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl,
8079 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign);
8082 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
8083 FieldEnd = ClassDecl->field_end();
8086 QualType FieldType = Context.getBaseElementType((*Field)->getType());
8087 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
8088 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl,
8090 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign);
8097 /// Determine whether the class type has any direct or indirect virtual base
8098 /// classes which have a non-trivial move assignment operator.
8100 hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) {
8101 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
8102 BaseEnd = ClassDecl->vbases_end();
8103 Base != BaseEnd; ++Base) {
8104 CXXRecordDecl *BaseClass =
8105 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8107 // Try to declare the move assignment. If it would be deleted, then the
8108 // class does not have a non-trivial move assignment.
8109 if (BaseClass->needsImplicitMoveAssignment())
8110 S.DeclareImplicitMoveAssignment(BaseClass);
8112 // If the class has both a trivial move assignment and a non-trivial move
8113 // assignment, hasTrivialMoveAssignment() is false.
8114 if (BaseClass->hasDeclaredMoveAssignment() &&
8115 !BaseClass->hasTrivialMoveAssignment())
8122 /// Determine whether the given type either has a move constructor or is
8123 /// trivially copyable.
8125 hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) {
8126 Type = S.Context.getBaseElementType(Type);
8128 // FIXME: Technically, non-trivially-copyable non-class types, such as
8129 // reference types, are supposed to return false here, but that appears
8130 // to be a standard defect.
8131 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl();
8135 if (Type.isTriviallyCopyableType(S.Context))
8138 if (IsConstructor) {
8139 if (ClassDecl->needsImplicitMoveConstructor())
8140 S.DeclareImplicitMoveConstructor(ClassDecl);
8141 return ClassDecl->hasDeclaredMoveConstructor();
8144 if (ClassDecl->needsImplicitMoveAssignment())
8145 S.DeclareImplicitMoveAssignment(ClassDecl);
8146 return ClassDecl->hasDeclaredMoveAssignment();
8149 /// Determine whether all non-static data members and direct or virtual bases
8150 /// of class \p ClassDecl have either a move operation, or are trivially
8152 static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl,
8153 bool IsConstructor) {
8154 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
8155 BaseEnd = ClassDecl->bases_end();
8156 Base != BaseEnd; ++Base) {
8157 if (Base->isVirtual())
8160 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor))
8164 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
8165 BaseEnd = ClassDecl->vbases_end();
8166 Base != BaseEnd; ++Base) {
8167 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor))
8171 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
8172 FieldEnd = ClassDecl->field_end();
8173 Field != FieldEnd; ++Field) {
8174 if (!hasMoveOrIsTriviallyCopyable(S, (*Field)->getType(), IsConstructor))
8181 CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) {
8182 // C++11 [class.copy]p20:
8183 // If the definition of a class X does not explicitly declare a move
8184 // assignment operator, one will be implicitly declared as defaulted
8187 // - [first 4 bullets]
8188 assert(ClassDecl->needsImplicitMoveAssignment());
8190 // [Checked after we build the declaration]
8191 // - the move assignment operator would not be implicitly defined as
8195 // - X has no direct or indirect virtual base class with a non-trivial
8196 // move assignment operator, and
8197 // - each of X's non-static data members and direct or virtual base classes
8198 // has a type that either has a move assignment operator or is trivially
8200 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) ||
8201 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) {
8202 ClassDecl->setFailedImplicitMoveAssignment();
8206 // Note: The following rules are largely analoguous to the move
8207 // constructor rules.
8209 ImplicitExceptionSpecification Spec(
8210 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl));
8212 QualType ArgType = Context.getTypeDeclType(ClassDecl);
8213 QualType RetType = Context.getLValueReferenceType(ArgType);
8214 ArgType = Context.getRValueReferenceType(ArgType);
8216 // An implicitly-declared move assignment operator is an inline public
8217 // member of its class.
8218 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
8219 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
8220 SourceLocation ClassLoc = ClassDecl->getLocation();
8221 DeclarationNameInfo NameInfo(Name, ClassLoc);
8222 CXXMethodDecl *MoveAssignment
8223 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo,
8224 Context.getFunctionType(RetType, &ArgType, 1, EPI),
8225 /*TInfo=*/0, /*isStatic=*/false,
8226 /*StorageClassAsWritten=*/SC_None,
8228 /*isConstexpr=*/false,
8230 MoveAssignment->setAccess(AS_public);
8231 MoveAssignment->setDefaulted();
8232 MoveAssignment->setImplicit();
8233 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment());
8235 // Add the parameter to the operator.
8236 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment,
8237 ClassLoc, ClassLoc, /*Id=*/0,
8238 ArgType, /*TInfo=*/0,
8241 MoveAssignment->setParams(FromParam);
8243 // Note that we have added this copy-assignment operator.
8244 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared;
8246 // C++0x [class.copy]p9:
8247 // If the definition of a class X does not explicitly declare a move
8248 // assignment operator, one will be implicitly declared as defaulted if and
8251 // - the move assignment operator would not be implicitly defined as
8253 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) {
8254 // Cache this result so that we don't try to generate this over and over
8255 // on every lookup, leaking memory and wasting time.
8256 ClassDecl->setFailedImplicitMoveAssignment();
8260 if (Scope *S = getScopeForContext(ClassDecl))
8261 PushOnScopeChains(MoveAssignment, S, false);
8262 ClassDecl->addDecl(MoveAssignment);
8264 AddOverriddenMethods(ClassDecl, MoveAssignment);
8265 return MoveAssignment;
8268 void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation,
8269 CXXMethodDecl *MoveAssignOperator) {
8270 assert((MoveAssignOperator->isDefaulted() &&
8271 MoveAssignOperator->isOverloadedOperator() &&
8272 MoveAssignOperator->getOverloadedOperator() == OO_Equal &&
8273 !MoveAssignOperator->doesThisDeclarationHaveABody() &&
8274 !MoveAssignOperator->isDeleted()) &&
8275 "DefineImplicitMoveAssignment called for wrong function");
8277 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent();
8279 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) {
8280 MoveAssignOperator->setInvalidDecl();
8284 MoveAssignOperator->setUsed();
8286 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator);
8287 DiagnosticErrorTrap Trap(Diags);
8289 // C++0x [class.copy]p28:
8290 // The implicitly-defined or move assignment operator for a non-union class
8291 // X performs memberwise move assignment of its subobjects. The direct base
8292 // classes of X are assigned first, in the order of their declaration in the
8293 // base-specifier-list, and then the immediate non-static data members of X
8294 // are assigned, in the order in which they were declared in the class
8297 // The statements that form the synthesized function body.
8298 ASTOwningVector<Stmt*> Statements(*this);
8300 // The parameter for the "other" object, which we are move from.
8301 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0);
8302 QualType OtherRefType = Other->getType()->
8303 getAs<RValueReferenceType>()->getPointeeType();
8304 assert(OtherRefType.getQualifiers() == 0 &&
8305 "Bad argument type of defaulted move assignment");
8307 // Our location for everything implicitly-generated.
8308 SourceLocation Loc = MoveAssignOperator->getLocation();
8310 // Construct a reference to the "other" object. We'll be using this
8311 // throughout the generated ASTs.
8312 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take();
8313 assert(OtherRef && "Reference to parameter cannot fail!");
8315 OtherRef = CastForMoving(*this, OtherRef);
8317 // Construct the "this" pointer. We'll be using this throughout the generated
8319 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>();
8320 assert(This && "Reference to this cannot fail!");
8322 // Assign base classes.
8323 bool Invalid = false;
8324 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
8325 E = ClassDecl->bases_end(); Base != E; ++Base) {
8326 // Form the assignment:
8327 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other));
8328 QualType BaseType = Base->getType().getUnqualifiedType();
8329 if (!BaseType->isRecordType()) {
8334 CXXCastPath BasePath;
8335 BasePath.push_back(Base);
8337 // Construct the "from" expression, which is an implicit cast to the
8338 // appropriately-qualified base type.
8339 Expr *From = OtherRef;
8340 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase,
8341 VK_XValue, &BasePath).take();
8343 // Dereference "this".
8344 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This);
8346 // Implicitly cast "this" to the appropriately-qualified base type.
8347 To = ImpCastExprToType(To.take(),
8348 Context.getCVRQualifiedType(BaseType,
8349 MoveAssignOperator->getTypeQualifiers()),
8350 CK_UncheckedDerivedToBase,
8351 VK_LValue, &BasePath);
8354 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType,
8356 /*CopyingBaseSubobject=*/true,
8358 if (Move.isInvalid()) {
8359 Diag(CurrentLocation, diag::note_member_synthesized_at)
8360 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
8361 MoveAssignOperator->setInvalidDecl();
8365 // Success! Record the move.
8366 Statements.push_back(Move.takeAs<Expr>());
8369 // \brief Reference to the __builtin_memcpy function.
8370 Expr *BuiltinMemCpyRef = 0;
8371 // \brief Reference to the __builtin_objc_memmove_collectable function.
8372 Expr *CollectableMemCpyRef = 0;
8374 // Assign non-static members.
8375 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
8376 FieldEnd = ClassDecl->field_end();
8377 Field != FieldEnd; ++Field) {
8378 if (Field->isUnnamedBitfield())
8381 // Check for members of reference type; we can't move those.
8382 if (Field->getType()->isReferenceType()) {
8383 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
8384 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
8385 Diag(Field->getLocation(), diag::note_declared_at);
8386 Diag(CurrentLocation, diag::note_member_synthesized_at)
8387 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
8392 // Check for members of const-qualified, non-class type.
8393 QualType BaseType = Context.getBaseElementType(Field->getType());
8394 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
8395 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
8396 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
8397 Diag(Field->getLocation(), diag::note_declared_at);
8398 Diag(CurrentLocation, diag::note_member_synthesized_at)
8399 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
8404 // Suppress assigning zero-width bitfields.
8405 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0)
8408 QualType FieldType = Field->getType().getNonReferenceType();
8409 if (FieldType->isIncompleteArrayType()) {
8410 assert(ClassDecl->hasFlexibleArrayMember() &&
8411 "Incomplete array type is not valid");
8415 // Build references to the field in the object we're copying from and to.
8416 CXXScopeSpec SS; // Intentionally empty
8417 LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
8419 MemberLookup.addDecl(*Field);
8420 MemberLookup.resolveKind();
8421 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType,
8422 Loc, /*IsArrow=*/false,
8423 SS, SourceLocation(), 0,
8425 ExprResult To = BuildMemberReferenceExpr(This, This->getType(),
8426 Loc, /*IsArrow=*/true,
8427 SS, SourceLocation(), 0,
8429 assert(!From.isInvalid() && "Implicit field reference cannot fail");
8430 assert(!To.isInvalid() && "Implicit field reference cannot fail");
8432 assert(!From.get()->isLValue() && // could be xvalue or prvalue
8433 "Member reference with rvalue base must be rvalue except for reference "
8434 "members, which aren't allowed for move assignment.");
8436 // If the field should be copied with __builtin_memcpy rather than via
8437 // explicit assignments, do so. This optimization only applies for arrays
8438 // of scalars and arrays of class type with trivial move-assignment
8440 if (FieldType->isArrayType() && !FieldType.isVolatileQualified()
8441 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) {
8442 // Compute the size of the memory buffer to be copied.
8443 QualType SizeType = Context.getSizeType();
8444 llvm::APInt Size(Context.getTypeSize(SizeType),
8445 Context.getTypeSizeInChars(BaseType).getQuantity());
8446 for (const ConstantArrayType *Array
8447 = Context.getAsConstantArrayType(FieldType);
8449 Array = Context.getAsConstantArrayType(Array->getElementType())) {
8450 llvm::APInt ArraySize
8451 = Array->getSize().zextOrTrunc(Size.getBitWidth());
8455 // Take the address of the field references for "from" and "to". We
8456 // directly construct UnaryOperators here because semantic analysis
8457 // does not permit us to take the address of an xvalue.
8458 From = new (Context) UnaryOperator(From.get(), UO_AddrOf,
8459 Context.getPointerType(From.get()->getType()),
8460 VK_RValue, OK_Ordinary, Loc);
8461 To = new (Context) UnaryOperator(To.get(), UO_AddrOf,
8462 Context.getPointerType(To.get()->getType()),
8463 VK_RValue, OK_Ordinary, Loc);
8465 bool NeedsCollectableMemCpy =
8466 (BaseType->isRecordType() &&
8467 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember());
8469 if (NeedsCollectableMemCpy) {
8470 if (!CollectableMemCpyRef) {
8471 // Create a reference to the __builtin_objc_memmove_collectable function.
8472 LookupResult R(*this,
8473 &Context.Idents.get("__builtin_objc_memmove_collectable"),
8474 Loc, LookupOrdinaryName);
8475 LookupName(R, TUScope, true);
8477 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>();
8478 if (!CollectableMemCpy) {
8479 // Something went horribly wrong earlier, and we will have
8480 // complained about it.
8485 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy,
8486 CollectableMemCpy->getType(),
8487 VK_LValue, Loc, 0).take();
8488 assert(CollectableMemCpyRef && "Builtin reference cannot fail");
8491 // Create a reference to the __builtin_memcpy builtin function.
8492 else if (!BuiltinMemCpyRef) {
8493 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc,
8494 LookupOrdinaryName);
8495 LookupName(R, TUScope, true);
8497 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>();
8498 if (!BuiltinMemCpy) {
8499 // Something went horribly wrong earlier, and we will have complained
8505 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy,
8506 BuiltinMemCpy->getType(),
8507 VK_LValue, Loc, 0).take();
8508 assert(BuiltinMemCpyRef && "Builtin reference cannot fail");
8511 ASTOwningVector<Expr*> CallArgs(*this);
8512 CallArgs.push_back(To.takeAs<Expr>());
8513 CallArgs.push_back(From.takeAs<Expr>());
8514 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc));
8515 ExprResult Call = ExprError();
8516 if (NeedsCollectableMemCpy)
8517 Call = ActOnCallExpr(/*Scope=*/0,
8518 CollectableMemCpyRef,
8519 Loc, move_arg(CallArgs),
8522 Call = ActOnCallExpr(/*Scope=*/0,
8524 Loc, move_arg(CallArgs),
8527 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!");
8528 Statements.push_back(Call.takeAs<Expr>());
8532 // Build the move of this field.
8533 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType,
8534 To.get(), From.get(),
8535 /*CopyingBaseSubobject=*/false,
8537 if (Move.isInvalid()) {
8538 Diag(CurrentLocation, diag::note_member_synthesized_at)
8539 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
8540 MoveAssignOperator->setInvalidDecl();
8544 // Success! Record the copy.
8545 Statements.push_back(Move.takeAs<Stmt>());
8549 // Add a "return *this;"
8550 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This);
8552 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get());
8553 if (Return.isInvalid())
8556 Statements.push_back(Return.takeAs<Stmt>());
8558 if (Trap.hasErrorOccurred()) {
8559 Diag(CurrentLocation, diag::note_member_synthesized_at)
8560 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
8567 MoveAssignOperator->setInvalidDecl();
8573 CompoundScopeRAII CompoundScope(*this);
8574 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements),
8575 /*isStmtExpr=*/false);
8576 assert(!Body.isInvalid() && "Compound statement creation cannot fail");
8578 MoveAssignOperator->setBody(Body.takeAs<Stmt>());
8580 if (ASTMutationListener *L = getASTMutationListener()) {
8581 L->CompletedImplicitDefinition(MoveAssignOperator);
8585 std::pair<Sema::ImplicitExceptionSpecification, bool>
8586 Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) {
8587 if (ClassDecl->isInvalidDecl())
8588 return std::make_pair(ImplicitExceptionSpecification(*this), false);
8590 // C++ [class.copy]p5:
8591 // The implicitly-declared copy constructor for a class X will
8597 // FIXME: It ought to be possible to store this on the record.
8598 bool HasConstCopyConstructor = true;
8600 // -- each direct or virtual base class B of X has a copy
8601 // constructor whose first parameter is of type const B& or
8602 // const volatile B&, and
8603 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
8604 BaseEnd = ClassDecl->bases_end();
8605 HasConstCopyConstructor && Base != BaseEnd;
8607 // Virtual bases are handled below.
8608 if (Base->isVirtual())
8611 CXXRecordDecl *BaseClassDecl
8612 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8613 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const,
8614 &HasConstCopyConstructor);
8617 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
8618 BaseEnd = ClassDecl->vbases_end();
8619 HasConstCopyConstructor && Base != BaseEnd;
8621 CXXRecordDecl *BaseClassDecl
8622 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8623 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const,
8624 &HasConstCopyConstructor);
8627 // -- for all the nonstatic data members of X that are of a
8628 // class type M (or array thereof), each such class type
8629 // has a copy constructor whose first parameter is of type
8630 // const M& or const volatile M&.
8631 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
8632 FieldEnd = ClassDecl->field_end();
8633 HasConstCopyConstructor && Field != FieldEnd;
8635 QualType FieldType = Context.getBaseElementType((*Field)->getType());
8636 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
8637 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const,
8638 &HasConstCopyConstructor);
8641 // Otherwise, the implicitly declared copy constructor will have
8646 // C++ [except.spec]p14:
8647 // An implicitly declared special member function (Clause 12) shall have an
8648 // exception-specification. [...]
8649 ImplicitExceptionSpecification ExceptSpec(*this);
8650 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0;
8651 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
8652 BaseEnd = ClassDecl->bases_end();
8655 // Virtual bases are handled below.
8656 if (Base->isVirtual())
8659 CXXRecordDecl *BaseClassDecl
8660 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8661 if (CXXConstructorDecl *CopyConstructor =
8662 LookupCopyingConstructor(BaseClassDecl, Quals))
8663 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor);
8665 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
8666 BaseEnd = ClassDecl->vbases_end();
8669 CXXRecordDecl *BaseClassDecl
8670 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8671 if (CXXConstructorDecl *CopyConstructor =
8672 LookupCopyingConstructor(BaseClassDecl, Quals))
8673 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor);
8675 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
8676 FieldEnd = ClassDecl->field_end();
8679 QualType FieldType = Context.getBaseElementType((*Field)->getType());
8680 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
8681 if (CXXConstructorDecl *CopyConstructor =
8682 LookupCopyingConstructor(FieldClassDecl, Quals))
8683 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor);
8687 return std::make_pair(ExceptSpec, HasConstCopyConstructor);
8690 CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor(
8691 CXXRecordDecl *ClassDecl) {
8692 // C++ [class.copy]p4:
8693 // If the class definition does not explicitly declare a copy
8694 // constructor, one is declared implicitly.
8696 ImplicitExceptionSpecification Spec(*this);
8698 llvm::tie(Spec, Const) =
8699 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl);
8701 QualType ClassType = Context.getTypeDeclType(ClassDecl);
8702 QualType ArgType = ClassType;
8704 ArgType = ArgType.withConst();
8705 ArgType = Context.getLValueReferenceType(ArgType);
8707 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
8709 DeclarationName Name
8710 = Context.DeclarationNames.getCXXConstructorName(
8711 Context.getCanonicalType(ClassType));
8712 SourceLocation ClassLoc = ClassDecl->getLocation();
8713 DeclarationNameInfo NameInfo(Name, ClassLoc);
8715 // An implicitly-declared copy constructor is an inline public
8716 // member of its class.
8717 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create(
8718 Context, ClassDecl, ClassLoc, NameInfo,
8719 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0,
8720 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true,
8721 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() &&
8722 getLangOpts().CPlusPlus0x);
8723 CopyConstructor->setAccess(AS_public);
8724 CopyConstructor->setDefaulted();
8725 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor());
8727 // Note that we have declared this constructor.
8728 ++ASTContext::NumImplicitCopyConstructorsDeclared;
8730 // Add the parameter to the constructor.
8731 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor,
8733 /*IdentifierInfo=*/0,
8734 ArgType, /*TInfo=*/0,
8737 CopyConstructor->setParams(FromParam);
8739 if (Scope *S = getScopeForContext(ClassDecl))
8740 PushOnScopeChains(CopyConstructor, S, false);
8741 ClassDecl->addDecl(CopyConstructor);
8743 // C++11 [class.copy]p8:
8744 // ... If the class definition does not explicitly declare a copy
8745 // constructor, there is no user-declared move constructor, and there is no
8746 // user-declared move assignment operator, a copy constructor is implicitly
8747 // declared as defaulted.
8748 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor))
8749 CopyConstructor->setDeletedAsWritten();
8751 return CopyConstructor;
8754 void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
8755 CXXConstructorDecl *CopyConstructor) {
8756 assert((CopyConstructor->isDefaulted() &&
8757 CopyConstructor->isCopyConstructor() &&
8758 !CopyConstructor->doesThisDeclarationHaveABody() &&
8759 !CopyConstructor->isDeleted()) &&
8760 "DefineImplicitCopyConstructor - call it for implicit copy ctor");
8762 CXXRecordDecl *ClassDecl = CopyConstructor->getParent();
8763 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor");
8765 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor);
8766 DiagnosticErrorTrap Trap(Diags);
8768 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) ||
8769 Trap.hasErrorOccurred()) {
8770 Diag(CurrentLocation, diag::note_member_synthesized_at)
8771 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl);
8772 CopyConstructor->setInvalidDecl();
8774 Sema::CompoundScopeRAII CompoundScope(*this);
8775 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(),
8776 CopyConstructor->getLocation(),
8777 MultiStmtArg(*this, 0, 0),
8778 /*isStmtExpr=*/false)
8780 CopyConstructor->setImplicitlyDefined(true);
8783 CopyConstructor->setUsed();
8784 if (ASTMutationListener *L = getASTMutationListener()) {
8785 L->CompletedImplicitDefinition(CopyConstructor);
8789 Sema::ImplicitExceptionSpecification
8790 Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) {
8791 // C++ [except.spec]p14:
8792 // An implicitly declared special member function (Clause 12) shall have an
8793 // exception-specification. [...]
8794 ImplicitExceptionSpecification ExceptSpec(*this);
8795 if (ClassDecl->isInvalidDecl())
8798 // Direct base-class constructors.
8799 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
8800 BEnd = ClassDecl->bases_end();
8802 if (B->isVirtual()) // Handled below.
8805 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
8806 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
8807 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl);
8808 // If this is a deleted function, add it anyway. This might be conformant
8809 // with the standard. This might not. I'm not sure. It might not matter.
8811 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
8815 // Virtual base-class constructors.
8816 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
8817 BEnd = ClassDecl->vbases_end();
8819 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
8820 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
8821 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl);
8822 // If this is a deleted function, add it anyway. This might be conformant
8823 // with the standard. This might not. I'm not sure. It might not matter.
8825 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
8829 // Field constructors.
8830 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
8831 FEnd = ClassDecl->field_end();
8833 if (const RecordType *RecordTy
8834 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) {
8835 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
8836 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl);
8837 // If this is a deleted function, add it anyway. This might be conformant
8838 // with the standard. This might not. I'm not sure. It might not matter.
8839 // In particular, the problem is that this function never gets called. It
8840 // might just be ill-formed because this function attempts to refer to
8841 // a deleted function here.
8843 ExceptSpec.CalledDecl(F->getLocation(), Constructor);
8850 CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor(
8851 CXXRecordDecl *ClassDecl) {
8852 // C++11 [class.copy]p9:
8853 // If the definition of a class X does not explicitly declare a move
8854 // constructor, one will be implicitly declared as defaulted if and only if:
8856 // - [first 4 bullets]
8857 assert(ClassDecl->needsImplicitMoveConstructor());
8859 // [Checked after we build the declaration]
8860 // - the move assignment operator would not be implicitly defined as
8864 // - each of X's non-static data members and direct or virtual base classes
8865 // has a type that either has a move constructor or is trivially copyable.
8866 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) {
8867 ClassDecl->setFailedImplicitMoveConstructor();
8871 ImplicitExceptionSpecification Spec(
8872 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl));
8874 QualType ClassType = Context.getTypeDeclType(ClassDecl);
8875 QualType ArgType = Context.getRValueReferenceType(ClassType);
8877 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
8879 DeclarationName Name
8880 = Context.DeclarationNames.getCXXConstructorName(
8881 Context.getCanonicalType(ClassType));
8882 SourceLocation ClassLoc = ClassDecl->getLocation();
8883 DeclarationNameInfo NameInfo(Name, ClassLoc);
8885 // C++0x [class.copy]p11:
8886 // An implicitly-declared copy/move constructor is an inline public
8887 // member of its class.
8888 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create(
8889 Context, ClassDecl, ClassLoc, NameInfo,
8890 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0,
8891 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true,
8892 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() &&
8893 getLangOpts().CPlusPlus0x);
8894 MoveConstructor->setAccess(AS_public);
8895 MoveConstructor->setDefaulted();
8896 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor());
8898 // Add the parameter to the constructor.
8899 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor,
8901 /*IdentifierInfo=*/0,
8902 ArgType, /*TInfo=*/0,
8905 MoveConstructor->setParams(FromParam);
8907 // C++0x [class.copy]p9:
8908 // If the definition of a class X does not explicitly declare a move
8909 // constructor, one will be implicitly declared as defaulted if and only if:
8911 // - the move constructor would not be implicitly defined as deleted.
8912 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) {
8913 // Cache this result so that we don't try to generate this over and over
8914 // on every lookup, leaking memory and wasting time.
8915 ClassDecl->setFailedImplicitMoveConstructor();
8919 // Note that we have declared this constructor.
8920 ++ASTContext::NumImplicitMoveConstructorsDeclared;
8922 if (Scope *S = getScopeForContext(ClassDecl))
8923 PushOnScopeChains(MoveConstructor, S, false);
8924 ClassDecl->addDecl(MoveConstructor);
8926 return MoveConstructor;
8929 void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation,
8930 CXXConstructorDecl *MoveConstructor) {
8931 assert((MoveConstructor->isDefaulted() &&
8932 MoveConstructor->isMoveConstructor() &&
8933 !MoveConstructor->doesThisDeclarationHaveABody() &&
8934 !MoveConstructor->isDeleted()) &&
8935 "DefineImplicitMoveConstructor - call it for implicit move ctor");
8937 CXXRecordDecl *ClassDecl = MoveConstructor->getParent();
8938 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor");
8940 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor);
8941 DiagnosticErrorTrap Trap(Diags);
8943 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) ||
8944 Trap.hasErrorOccurred()) {
8945 Diag(CurrentLocation, diag::note_member_synthesized_at)
8946 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl);
8947 MoveConstructor->setInvalidDecl();
8949 Sema::CompoundScopeRAII CompoundScope(*this);
8950 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(),
8951 MoveConstructor->getLocation(),
8952 MultiStmtArg(*this, 0, 0),
8953 /*isStmtExpr=*/false)
8955 MoveConstructor->setImplicitlyDefined(true);
8958 MoveConstructor->setUsed();
8960 if (ASTMutationListener *L = getASTMutationListener()) {
8961 L->CompletedImplicitDefinition(MoveConstructor);
8965 bool Sema::isImplicitlyDeleted(FunctionDecl *FD) {
8966 return FD->isDeleted() &&
8967 (FD->isDefaulted() || FD->isImplicit()) &&
8968 isa<CXXMethodDecl>(FD);
8971 /// \brief Mark the call operator of the given lambda closure type as "used".
8972 static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) {
8973 CXXMethodDecl *CallOperator
8974 = cast<CXXMethodDecl>(
8976 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first);
8977 CallOperator->setReferenced();
8978 CallOperator->setUsed();
8981 void Sema::DefineImplicitLambdaToFunctionPointerConversion(
8982 SourceLocation CurrentLocation,
8983 CXXConversionDecl *Conv)
8985 CXXRecordDecl *Lambda = Conv->getParent();
8987 // Make sure that the lambda call operator is marked used.
8988 markLambdaCallOperatorUsed(*this, Lambda);
8992 ImplicitlyDefinedFunctionScope Scope(*this, Conv);
8993 DiagnosticErrorTrap Trap(Diags);
8995 // Return the address of the __invoke function.
8996 DeclarationName InvokeName = &Context.Idents.get("__invoke");
8997 CXXMethodDecl *Invoke
8998 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first);
8999 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(),
9000 VK_LValue, Conv->getLocation()).take();
9001 assert(FunctionRef && "Can't refer to __invoke function?");
9002 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take();
9003 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1,
9004 Conv->getLocation(),
9005 Conv->getLocation()));
9007 // Fill in the __invoke function with a dummy implementation. IR generation
9008 // will fill in the actual details.
9010 Invoke->setReferenced();
9011 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(),
9012 Conv->getLocation()));
9014 if (ASTMutationListener *L = getASTMutationListener()) {
9015 L->CompletedImplicitDefinition(Conv);
9016 L->CompletedImplicitDefinition(Invoke);
9020 void Sema::DefineImplicitLambdaToBlockPointerConversion(
9021 SourceLocation CurrentLocation,
9022 CXXConversionDecl *Conv)
9026 ImplicitlyDefinedFunctionScope Scope(*this, Conv);
9027 DiagnosticErrorTrap Trap(Diags);
9029 // Copy-initialize the lambda object as needed to capture it.
9030 Expr *This = ActOnCXXThis(CurrentLocation).take();
9031 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take();
9033 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation,
9034 Conv->getLocation(),
9037 // If we're not under ARC, make sure we still get the _Block_copy/autorelease
9038 // behavior. Note that only the general conversion function does this
9039 // (since it's unusable otherwise); in the case where we inline the
9040 // block literal, it has block literal lifetime semantics.
9041 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount)
9042 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(),
9043 CK_CopyAndAutoreleaseBlockObject,
9044 BuildBlock.get(), 0, VK_RValue);
9046 if (BuildBlock.isInvalid()) {
9047 Diag(CurrentLocation, diag::note_lambda_to_block_conv);
9048 Conv->setInvalidDecl();
9052 // Create the return statement that returns the block from the conversion
9054 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get());
9055 if (Return.isInvalid()) {
9056 Diag(CurrentLocation, diag::note_lambda_to_block_conv);
9057 Conv->setInvalidDecl();
9061 // Set the body of the conversion function.
9062 Stmt *ReturnS = Return.take();
9063 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1,
9064 Conv->getLocation(),
9065 Conv->getLocation()));
9067 // We're done; notify the mutation listener, if any.
9068 if (ASTMutationListener *L = getASTMutationListener()) {
9069 L->CompletedImplicitDefinition(Conv);
9073 /// \brief Determine whether the given list arguments contains exactly one
9074 /// "real" (non-default) argument.
9075 static bool hasOneRealArgument(MultiExprArg Args) {
9076 switch (Args.size()) {
9081 if (!Args.get()[1]->isDefaultArgument())
9086 return !Args.get()[0]->isDefaultArgument();
9093 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
9094 CXXConstructorDecl *Constructor,
9095 MultiExprArg ExprArgs,
9096 bool HadMultipleCandidates,
9097 bool RequiresZeroInit,
9098 unsigned ConstructKind,
9099 SourceRange ParenRange) {
9100 bool Elidable = false;
9102 // C++0x [class.copy]p34:
9103 // When certain criteria are met, an implementation is allowed to
9104 // omit the copy/move construction of a class object, even if the
9105 // copy/move constructor and/or destructor for the object have
9106 // side effects. [...]
9107 // - when a temporary class object that has not been bound to a
9108 // reference (12.2) would be copied/moved to a class object
9109 // with the same cv-unqualified type, the copy/move operation
9110 // can be omitted by constructing the temporary object
9111 // directly into the target of the omitted copy/move
9112 if (ConstructKind == CXXConstructExpr::CK_Complete &&
9113 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) {
9114 Expr *SubExpr = ((Expr **)ExprArgs.get())[0];
9115 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent());
9118 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor,
9119 Elidable, move(ExprArgs), HadMultipleCandidates,
9120 RequiresZeroInit, ConstructKind, ParenRange);
9123 /// BuildCXXConstructExpr - Creates a complete call to a constructor,
9124 /// including handling of its default argument expressions.
9126 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
9127 CXXConstructorDecl *Constructor, bool Elidable,
9128 MultiExprArg ExprArgs,
9129 bool HadMultipleCandidates,
9130 bool RequiresZeroInit,
9131 unsigned ConstructKind,
9132 SourceRange ParenRange) {
9133 unsigned NumExprs = ExprArgs.size();
9134 Expr **Exprs = (Expr **)ExprArgs.release();
9136 for (specific_attr_iterator<NonNullAttr>
9137 i = Constructor->specific_attr_begin<NonNullAttr>(),
9138 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) {
9139 const NonNullAttr *NonNull = *i;
9140 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc);
9143 MarkFunctionReferenced(ConstructLoc, Constructor);
9144 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc,
9145 Constructor, Elidable, Exprs, NumExprs,
9146 HadMultipleCandidates, /*FIXME*/false,
9148 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind),
9152 bool Sema::InitializeVarWithConstructor(VarDecl *VD,
9153 CXXConstructorDecl *Constructor,
9155 bool HadMultipleCandidates) {
9156 // FIXME: Provide the correct paren SourceRange when available.
9157 ExprResult TempResult =
9158 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor,
9159 move(Exprs), HadMultipleCandidates, false,
9160 CXXConstructExpr::CK_Complete, SourceRange());
9161 if (TempResult.isInvalid())
9164 Expr *Temp = TempResult.takeAs<Expr>();
9165 CheckImplicitConversions(Temp, VD->getLocation());
9166 MarkFunctionReferenced(VD->getLocation(), Constructor);
9167 Temp = MaybeCreateExprWithCleanups(Temp);
9173 void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) {
9174 if (VD->isInvalidDecl()) return;
9176 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl());
9177 if (ClassDecl->isInvalidDecl()) return;
9178 if (ClassDecl->hasIrrelevantDestructor()) return;
9179 if (ClassDecl->isDependentContext()) return;
9181 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl);
9182 MarkFunctionReferenced(VD->getLocation(), Destructor);
9183 CheckDestructorAccess(VD->getLocation(), Destructor,
9184 PDiag(diag::err_access_dtor_var)
9185 << VD->getDeclName()
9187 DiagnoseUseOfDecl(Destructor, VD->getLocation());
9189 if (!VD->hasGlobalStorage()) return;
9191 // Emit warning for non-trivial dtor in global scope (a real global,
9192 // class-static, function-static).
9193 Diag(VD->getLocation(), diag::warn_exit_time_destructor);
9195 // TODO: this should be re-enabled for static locals by !CXAAtExit
9196 if (!VD->isStaticLocal())
9197 Diag(VD->getLocation(), diag::warn_global_destructor);
9200 /// \brief Given a constructor and the set of arguments provided for the
9201 /// constructor, convert the arguments and add any required default arguments
9202 /// to form a proper call to this constructor.
9204 /// \returns true if an error occurred, false otherwise.
9206 Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor,
9207 MultiExprArg ArgsPtr,
9209 ASTOwningVector<Expr*> &ConvertedArgs,
9210 bool AllowExplicit) {
9211 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall.
9212 unsigned NumArgs = ArgsPtr.size();
9213 Expr **Args = (Expr **)ArgsPtr.get();
9215 const FunctionProtoType *Proto
9216 = Constructor->getType()->getAs<FunctionProtoType>();
9217 assert(Proto && "Constructor without a prototype?");
9218 unsigned NumArgsInProto = Proto->getNumArgs();
9220 // If too few arguments are available, we'll fill in the rest with defaults.
9221 if (NumArgs < NumArgsInProto)
9222 ConvertedArgs.reserve(NumArgsInProto);
9224 ConvertedArgs.reserve(NumArgs);
9226 VariadicCallType CallType =
9227 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;
9228 SmallVector<Expr *, 8> AllArgs;
9229 bool Invalid = GatherArgumentsForCall(Loc, Constructor,
9230 Proto, 0, Args, NumArgs, AllArgs,
9231 CallType, AllowExplicit);
9232 ConvertedArgs.append(AllArgs.begin(), AllArgs.end());
9234 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size());
9236 // FIXME: Missing call to CheckFunctionCall or equivalent
9242 CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef,
9243 const FunctionDecl *FnDecl) {
9244 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext();
9245 if (isa<NamespaceDecl>(DC)) {
9246 return SemaRef.Diag(FnDecl->getLocation(),
9247 diag::err_operator_new_delete_declared_in_namespace)
9248 << FnDecl->getDeclName();
9251 if (isa<TranslationUnitDecl>(DC) &&
9252 FnDecl->getStorageClass() == SC_Static) {
9253 return SemaRef.Diag(FnDecl->getLocation(),
9254 diag::err_operator_new_delete_declared_static)
9255 << FnDecl->getDeclName();
9262 CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl,
9263 CanQualType ExpectedResultType,
9264 CanQualType ExpectedFirstParamType,
9265 unsigned DependentParamTypeDiag,
9266 unsigned InvalidParamTypeDiag) {
9267 QualType ResultType =
9268 FnDecl->getType()->getAs<FunctionType>()->getResultType();
9270 // Check that the result type is not dependent.
9271 if (ResultType->isDependentType())
9272 return SemaRef.Diag(FnDecl->getLocation(),
9273 diag::err_operator_new_delete_dependent_result_type)
9274 << FnDecl->getDeclName() << ExpectedResultType;
9276 // Check that the result type is what we expect.
9277 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType)
9278 return SemaRef.Diag(FnDecl->getLocation(),
9279 diag::err_operator_new_delete_invalid_result_type)
9280 << FnDecl->getDeclName() << ExpectedResultType;
9282 // A function template must have at least 2 parameters.
9283 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2)
9284 return SemaRef.Diag(FnDecl->getLocation(),
9285 diag::err_operator_new_delete_template_too_few_parameters)
9286 << FnDecl->getDeclName();
9288 // The function decl must have at least 1 parameter.
9289 if (FnDecl->getNumParams() == 0)
9290 return SemaRef.Diag(FnDecl->getLocation(),
9291 diag::err_operator_new_delete_too_few_parameters)
9292 << FnDecl->getDeclName();
9294 // Check the the first parameter type is not dependent.
9295 QualType FirstParamType = FnDecl->getParamDecl(0)->getType();
9296 if (FirstParamType->isDependentType())
9297 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag)
9298 << FnDecl->getDeclName() << ExpectedFirstParamType;
9300 // Check that the first parameter type is what we expect.
9301 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() !=
9302 ExpectedFirstParamType)
9303 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag)
9304 << FnDecl->getDeclName() << ExpectedFirstParamType;
9310 CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
9311 // C++ [basic.stc.dynamic.allocation]p1:
9312 // A program is ill-formed if an allocation function is declared in a
9313 // namespace scope other than global scope or declared static in global
9315 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
9318 CanQualType SizeTy =
9319 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType());
9321 // C++ [basic.stc.dynamic.allocation]p1:
9322 // The return type shall be void*. The first parameter shall have type
9324 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy,
9326 diag::err_operator_new_dependent_param_type,
9327 diag::err_operator_new_param_type))
9330 // C++ [basic.stc.dynamic.allocation]p1:
9331 // The first parameter shall not have an associated default argument.
9332 if (FnDecl->getParamDecl(0)->hasDefaultArg())
9333 return SemaRef.Diag(FnDecl->getLocation(),
9334 diag::err_operator_new_default_arg)
9335 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange();
9341 CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
9342 // C++ [basic.stc.dynamic.deallocation]p1:
9343 // A program is ill-formed if deallocation functions are declared in a
9344 // namespace scope other than global scope or declared static in global
9346 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
9349 // C++ [basic.stc.dynamic.deallocation]p2:
9350 // Each deallocation function shall return void and its first parameter
9352 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy,
9353 SemaRef.Context.VoidPtrTy,
9354 diag::err_operator_delete_dependent_param_type,
9355 diag::err_operator_delete_param_type))
9361 /// CheckOverloadedOperatorDeclaration - Check whether the declaration
9362 /// of this overloaded operator is well-formed. If so, returns false;
9363 /// otherwise, emits appropriate diagnostics and returns true.
9364 bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
9365 assert(FnDecl && FnDecl->isOverloadedOperator() &&
9366 "Expected an overloaded operator declaration");
9368 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator();
9370 // C++ [over.oper]p5:
9371 // The allocation and deallocation functions, operator new,
9372 // operator new[], operator delete and operator delete[], are
9373 // described completely in 3.7.3. The attributes and restrictions
9374 // found in the rest of this subclause do not apply to them unless
9375 // explicitly stated in 3.7.3.
9376 if (Op == OO_Delete || Op == OO_Array_Delete)
9377 return CheckOperatorDeleteDeclaration(*this, FnDecl);
9379 if (Op == OO_New || Op == OO_Array_New)
9380 return CheckOperatorNewDeclaration(*this, FnDecl);
9382 // C++ [over.oper]p6:
9383 // An operator function shall either be a non-static member
9384 // function or be a non-member function and have at least one
9385 // parameter whose type is a class, a reference to a class, an
9386 // enumeration, or a reference to an enumeration.
9387 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) {
9388 if (MethodDecl->isStatic())
9389 return Diag(FnDecl->getLocation(),
9390 diag::err_operator_overload_static) << FnDecl->getDeclName();
9392 bool ClassOrEnumParam = false;
9393 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(),
9394 ParamEnd = FnDecl->param_end();
9395 Param != ParamEnd; ++Param) {
9396 QualType ParamType = (*Param)->getType().getNonReferenceType();
9397 if (ParamType->isDependentType() || ParamType->isRecordType() ||
9398 ParamType->isEnumeralType()) {
9399 ClassOrEnumParam = true;
9404 if (!ClassOrEnumParam)
9405 return Diag(FnDecl->getLocation(),
9406 diag::err_operator_overload_needs_class_or_enum)
9407 << FnDecl->getDeclName();
9410 // C++ [over.oper]p8:
9411 // An operator function cannot have default arguments (8.3.6),
9412 // except where explicitly stated below.
9414 // Only the function-call operator allows default arguments
9415 // (C++ [over.call]p1).
9416 if (Op != OO_Call) {
9417 for (FunctionDecl::param_iterator Param = FnDecl->param_begin();
9418 Param != FnDecl->param_end(); ++Param) {
9419 if ((*Param)->hasDefaultArg())
9420 return Diag((*Param)->getLocation(),
9421 diag::err_operator_overload_default_arg)
9422 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange();
9426 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = {
9427 { false, false, false }
9428 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
9429 , { Unary, Binary, MemberOnly }
9430 #include "clang/Basic/OperatorKinds.def"
9433 bool CanBeUnaryOperator = OperatorUses[Op][0];
9434 bool CanBeBinaryOperator = OperatorUses[Op][1];
9435 bool MustBeMemberOperator = OperatorUses[Op][2];
9437 // C++ [over.oper]p8:
9438 // [...] Operator functions cannot have more or fewer parameters
9439 // than the number required for the corresponding operator, as
9440 // described in the rest of this subclause.
9441 unsigned NumParams = FnDecl->getNumParams()
9442 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0);
9443 if (Op != OO_Call &&
9444 ((NumParams == 1 && !CanBeUnaryOperator) ||
9445 (NumParams == 2 && !CanBeBinaryOperator) ||
9446 (NumParams < 1) || (NumParams > 2))) {
9447 // We have the wrong number of parameters.
9449 if (CanBeUnaryOperator && CanBeBinaryOperator) {
9450 ErrorKind = 2; // 2 -> unary or binary.
9451 } else if (CanBeUnaryOperator) {
9452 ErrorKind = 0; // 0 -> unary
9454 assert(CanBeBinaryOperator &&
9455 "All non-call overloaded operators are unary or binary!");
9456 ErrorKind = 1; // 1 -> binary
9459 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be)
9460 << FnDecl->getDeclName() << NumParams << ErrorKind;
9463 // Overloaded operators other than operator() cannot be variadic.
9464 if (Op != OO_Call &&
9465 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) {
9466 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic)
9467 << FnDecl->getDeclName();
9470 // Some operators must be non-static member functions.
9471 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) {
9472 return Diag(FnDecl->getLocation(),
9473 diag::err_operator_overload_must_be_member)
9474 << FnDecl->getDeclName();
9477 // C++ [over.inc]p1:
9478 // The user-defined function called operator++ implements the
9479 // prefix and postfix ++ operator. If this function is a member
9480 // function with no parameters, or a non-member function with one
9481 // parameter of class or enumeration type, it defines the prefix
9482 // increment operator ++ for objects of that type. If the function
9483 // is a member function with one parameter (which shall be of type
9484 // int) or a non-member function with two parameters (the second
9485 // of which shall be of type int), it defines the postfix
9486 // increment operator ++ for objects of that type.
9487 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) {
9488 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1);
9489 bool ParamIsInt = false;
9490 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>())
9491 ParamIsInt = BT->getKind() == BuiltinType::Int;
9494 return Diag(LastParam->getLocation(),
9495 diag::err_operator_overload_post_incdec_must_be_int)
9496 << LastParam->getType() << (Op == OO_MinusMinus);
9502 /// CheckLiteralOperatorDeclaration - Check whether the declaration
9503 /// of this literal operator function is well-formed. If so, returns
9504 /// false; otherwise, emits appropriate diagnostics and returns true.
9505 bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) {
9506 if (isa<CXXMethodDecl>(FnDecl)) {
9507 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace)
9508 << FnDecl->getDeclName();
9512 if (FnDecl->isExternC()) {
9513 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c);
9519 // This might be the definition of a literal operator template.
9520 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate();
9521 // This might be a specialization of a literal operator template.
9523 TpDecl = FnDecl->getPrimaryTemplate();
9525 // template <char...> type operator "" name() is the only valid template
9526 // signature, and the only valid signature with no parameters.
9528 if (FnDecl->param_size() == 0) {
9529 // Must have only one template parameter
9530 TemplateParameterList *Params = TpDecl->getTemplateParameters();
9531 if (Params->size() == 1) {
9532 NonTypeTemplateParmDecl *PmDecl =
9533 cast<NonTypeTemplateParmDecl>(Params->getParam(0));
9535 // The template parameter must be a char parameter pack.
9536 if (PmDecl && PmDecl->isTemplateParameterPack() &&
9537 Context.hasSameType(PmDecl->getType(), Context.CharTy))
9541 } else if (FnDecl->param_size()) {
9542 // Check the first parameter
9543 FunctionDecl::param_iterator Param = FnDecl->param_begin();
9545 QualType T = (*Param)->getType().getUnqualifiedType();
9547 // unsigned long long int, long double, and any character type are allowed
9548 // as the only parameters.
9549 if (Context.hasSameType(T, Context.UnsignedLongLongTy) ||
9550 Context.hasSameType(T, Context.LongDoubleTy) ||
9551 Context.hasSameType(T, Context.CharTy) ||
9552 Context.hasSameType(T, Context.WCharTy) ||
9553 Context.hasSameType(T, Context.Char16Ty) ||
9554 Context.hasSameType(T, Context.Char32Ty)) {
9555 if (++Param == FnDecl->param_end())
9557 goto FinishedParams;
9560 // Otherwise it must be a pointer to const; let's strip those qualifiers.
9561 const PointerType *PT = T->getAs<PointerType>();
9563 goto FinishedParams;
9564 T = PT->getPointeeType();
9565 if (!T.isConstQualified() || T.isVolatileQualified())
9566 goto FinishedParams;
9567 T = T.getUnqualifiedType();
9569 // Move on to the second parameter;
9572 // If there is no second parameter, the first must be a const char *
9573 if (Param == FnDecl->param_end()) {
9574 if (Context.hasSameType(T, Context.CharTy))
9576 goto FinishedParams;
9579 // const char *, const wchar_t*, const char16_t*, and const char32_t*
9580 // are allowed as the first parameter to a two-parameter function
9581 if (!(Context.hasSameType(T, Context.CharTy) ||
9582 Context.hasSameType(T, Context.WCharTy) ||
9583 Context.hasSameType(T, Context.Char16Ty) ||
9584 Context.hasSameType(T, Context.Char32Ty)))
9585 goto FinishedParams;
9587 // The second and final parameter must be an std::size_t
9588 T = (*Param)->getType().getUnqualifiedType();
9589 if (Context.hasSameType(T, Context.getSizeType()) &&
9590 ++Param == FnDecl->param_end())
9594 // FIXME: This diagnostic is absolutely terrible.
9597 Diag(FnDecl->getLocation(), diag::err_literal_operator_params)
9598 << FnDecl->getDeclName();
9602 // A parameter-declaration-clause containing a default argument is not
9603 // equivalent to any of the permitted forms.
9604 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(),
9605 ParamEnd = FnDecl->param_end();
9606 Param != ParamEnd; ++Param) {
9607 if ((*Param)->hasDefaultArg()) {
9608 Diag((*Param)->getDefaultArgRange().getBegin(),
9609 diag::err_literal_operator_default_argument)
9610 << (*Param)->getDefaultArgRange();
9615 StringRef LiteralName
9616 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName();
9617 if (LiteralName[0] != '_') {
9618 // C++11 [usrlit.suffix]p1:
9619 // Literal suffix identifiers that do not start with an underscore
9620 // are reserved for future standardization.
9621 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved);
9627 /// ActOnStartLinkageSpecification - Parsed the beginning of a C++
9628 /// linkage specification, including the language and (if present)
9629 /// the '{'. ExternLoc is the location of the 'extern', LangLoc is
9630 /// the location of the language string literal, which is provided
9631 /// by Lang/StrSize. LBraceLoc, if valid, provides the location of
9632 /// the '{' brace. Otherwise, this linkage specification does not
9633 /// have any braces.
9634 Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc,
9635 SourceLocation LangLoc,
9637 SourceLocation LBraceLoc) {
9638 LinkageSpecDecl::LanguageIDs Language;
9639 if (Lang == "\"C\"")
9640 Language = LinkageSpecDecl::lang_c;
9641 else if (Lang == "\"C++\"")
9642 Language = LinkageSpecDecl::lang_cxx;
9644 Diag(LangLoc, diag::err_bad_language);
9648 // FIXME: Add all the various semantics of linkage specifications
9650 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext,
9651 ExternLoc, LangLoc, Language);
9652 CurContext->addDecl(D);
9653 PushDeclContext(S, D);
9657 /// ActOnFinishLinkageSpecification - Complete the definition of
9658 /// the C++ linkage specification LinkageSpec. If RBraceLoc is
9659 /// valid, it's the position of the closing '}' brace in a linkage
9660 /// specification that uses braces.
9661 Decl *Sema::ActOnFinishLinkageSpecification(Scope *S,
9663 SourceLocation RBraceLoc) {
9665 if (RBraceLoc.isValid()) {
9666 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec);
9667 LSDecl->setRBraceLoc(RBraceLoc);
9674 /// \brief Perform semantic analysis for the variable declaration that
9675 /// occurs within a C++ catch clause, returning the newly-created
9677 VarDecl *Sema::BuildExceptionDeclaration(Scope *S,
9678 TypeSourceInfo *TInfo,
9679 SourceLocation StartLoc,
9681 IdentifierInfo *Name) {
9682 bool Invalid = false;
9683 QualType ExDeclType = TInfo->getType();
9685 // Arrays and functions decay.
9686 if (ExDeclType->isArrayType())
9687 ExDeclType = Context.getArrayDecayedType(ExDeclType);
9688 else if (ExDeclType->isFunctionType())
9689 ExDeclType = Context.getPointerType(ExDeclType);
9691 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type.
9692 // The exception-declaration shall not denote a pointer or reference to an
9693 // incomplete type, other than [cv] void*.
9694 // N2844 forbids rvalue references.
9695 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) {
9696 Diag(Loc, diag::err_catch_rvalue_ref);
9700 QualType BaseType = ExDeclType;
9701 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference
9702 unsigned DK = diag::err_catch_incomplete;
9703 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
9704 BaseType = Ptr->getPointeeType();
9706 DK = diag::err_catch_incomplete_ptr;
9707 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) {
9708 // For the purpose of error recovery, we treat rvalue refs like lvalue refs.
9709 BaseType = Ref->getPointeeType();
9711 DK = diag::err_catch_incomplete_ref;
9713 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) &&
9714 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK))
9717 if (!Invalid && !ExDeclType->isDependentType() &&
9718 RequireNonAbstractType(Loc, ExDeclType,
9719 diag::err_abstract_type_in_decl,
9720 AbstractVariableType))
9723 // Only the non-fragile NeXT runtime currently supports C++ catches
9724 // of ObjC types, and no runtime supports catching ObjC types by value.
9725 if (!Invalid && getLangOpts().ObjC1) {
9726 QualType T = ExDeclType;
9727 if (const ReferenceType *RT = T->getAs<ReferenceType>())
9728 T = RT->getPointeeType();
9730 if (T->isObjCObjectType()) {
9731 Diag(Loc, diag::err_objc_object_catch);
9733 } else if (T->isObjCObjectPointerType()) {
9734 if (!getLangOpts().ObjCNonFragileABI)
9735 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile);
9739 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name,
9740 ExDeclType, TInfo, SC_None, SC_None);
9741 ExDecl->setExceptionVariable(true);
9743 // In ARC, infer 'retaining' for variables of retainable type.
9744 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl))
9747 if (!Invalid && !ExDeclType->isDependentType()) {
9748 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) {
9749 // C++ [except.handle]p16:
9750 // The object declared in an exception-declaration or, if the
9751 // exception-declaration does not specify a name, a temporary (12.2) is
9752 // copy-initialized (8.5) from the exception object. [...]
9753 // The object is destroyed when the handler exits, after the destruction
9754 // of any automatic objects initialized within the handler.
9756 // We just pretend to initialize the object with itself, then make sure
9757 // it can be destroyed later.
9758 QualType initType = ExDeclType;
9760 InitializedEntity entity =
9761 InitializedEntity::InitializeVariable(ExDecl);
9762 InitializationKind initKind =
9763 InitializationKind::CreateCopy(Loc, SourceLocation());
9766 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary);
9767 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1);
9768 ExprResult result = sequence.Perform(*this, entity, initKind,
9769 MultiExprArg(&opaqueValue, 1));
9770 if (result.isInvalid())
9773 // If the constructor used was non-trivial, set this as the
9775 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take());
9776 if (!construct->getConstructor()->isTrivial()) {
9777 Expr *init = MaybeCreateExprWithCleanups(construct);
9778 ExDecl->setInit(init);
9781 // And make sure it's destructable.
9782 FinalizeVarWithDestructor(ExDecl, recordType);
9788 ExDecl->setInvalidDecl();
9793 /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
9795 Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
9796 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
9797 bool Invalid = D.isInvalidType();
9799 // Check for unexpanded parameter packs.
9800 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
9801 UPPC_ExceptionType)) {
9802 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
9803 D.getIdentifierLoc());
9807 IdentifierInfo *II = D.getIdentifier();
9808 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(),
9810 ForRedeclaration)) {
9811 // The scope should be freshly made just for us. There is just no way
9812 // it contains any previous declaration.
9813 assert(!S->isDeclScope(PrevDecl));
9814 if (PrevDecl->isTemplateParameter()) {
9815 // Maybe we will complain about the shadowed template parameter.
9816 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
9821 if (D.getCXXScopeSpec().isSet() && !Invalid) {
9822 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator)
9823 << D.getCXXScopeSpec().getRange();
9827 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo,
9829 D.getIdentifierLoc(),
9832 ExDecl->setInvalidDecl();
9834 // Add the exception declaration into this scope.
9836 PushOnScopeChains(ExDecl, S);
9838 CurContext->addDecl(ExDecl);
9840 ProcessDeclAttributes(S, ExDecl, D);
9844 Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc,
9846 Expr *AssertMessageExpr_,
9847 SourceLocation RParenLoc) {
9848 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_);
9850 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) {
9851 // In a static_assert-declaration, the constant-expression shall be a
9852 // constant expression that can be contextually converted to bool.
9853 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr);
9854 if (Converted.isInvalid())
9858 if (VerifyIntegerConstantExpression(Converted.get(), &Cond,
9859 PDiag(diag::err_static_assert_expression_is_not_constant),
9860 /*AllowFold=*/false).isInvalid())
9864 llvm::SmallString<256> MsgBuffer;
9865 llvm::raw_svector_ostream Msg(MsgBuffer);
9866 AssertMessage->printPretty(Msg, Context, 0, getPrintingPolicy());
9867 Diag(StaticAssertLoc, diag::err_static_assert_failed)
9868 << Msg.str() << AssertExpr->getSourceRange();
9872 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression))
9875 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc,
9876 AssertExpr, AssertMessage, RParenLoc);
9878 CurContext->addDecl(Decl);
9882 /// \brief Perform semantic analysis of the given friend type declaration.
9884 /// \returns A friend declaration that.
9885 FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc,
9886 SourceLocation FriendLoc,
9887 TypeSourceInfo *TSInfo) {
9888 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration");
9890 QualType T = TSInfo->getType();
9891 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange();
9893 // C++03 [class.friend]p2:
9894 // An elaborated-type-specifier shall be used in a friend declaration
9897 // * The class-key of the elaborated-type-specifier is required.
9898 if (!ActiveTemplateInstantiations.empty()) {
9899 // Do not complain about the form of friend template types during
9900 // template instantiation; we will already have complained when the
9901 // template was declared.
9902 } else if (!T->isElaboratedTypeSpecifier()) {
9903 // If we evaluated the type to a record type, suggest putting
9905 if (const RecordType *RT = T->getAs<RecordType>()) {
9906 RecordDecl *RD = RT->getDecl();
9908 std::string InsertionText = std::string(" ") + RD->getKindName();
9910 Diag(TypeRange.getBegin(),
9911 getLangOpts().CPlusPlus0x ?
9912 diag::warn_cxx98_compat_unelaborated_friend_type :
9913 diag::ext_unelaborated_friend_type)
9914 << (unsigned) RD->getTagKind()
9916 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc),
9920 getLangOpts().CPlusPlus0x ?
9921 diag::warn_cxx98_compat_nonclass_type_friend :
9922 diag::ext_nonclass_type_friend)
9924 << SourceRange(FriendLoc, TypeRange.getEnd());
9926 } else if (T->getAs<EnumType>()) {
9928 getLangOpts().CPlusPlus0x ?
9929 diag::warn_cxx98_compat_enum_friend :
9930 diag::ext_enum_friend)
9932 << SourceRange(FriendLoc, TypeRange.getEnd());
9935 // C++0x [class.friend]p3:
9936 // If the type specifier in a friend declaration designates a (possibly
9937 // cv-qualified) class type, that class is declared as a friend; otherwise,
9938 // the friend declaration is ignored.
9940 // FIXME: C++0x has some syntactic restrictions on friend type declarations
9941 // in [class.friend]p3 that we do not implement.
9943 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc);
9946 /// Handle a friend tag declaration where the scope specifier was
9948 Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc,
9949 unsigned TagSpec, SourceLocation TagLoc,
9951 IdentifierInfo *Name, SourceLocation NameLoc,
9952 AttributeList *Attr,
9953 MultiTemplateParamsArg TempParamLists) {
9954 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
9956 bool isExplicitSpecialization = false;
9957 bool Invalid = false;
9959 if (TemplateParameterList *TemplateParams
9960 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS,
9961 TempParamLists.get(),
9962 TempParamLists.size(),
9964 isExplicitSpecialization,
9966 if (TemplateParams->size() > 0) {
9967 // This is a declaration of a class template.
9971 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc,
9972 SS, Name, NameLoc, Attr,
9973 TemplateParams, AS_public,
9974 /*ModulePrivateLoc=*/SourceLocation(),
9975 TempParamLists.size() - 1,
9976 (TemplateParameterList**) TempParamLists.release()).take();
9978 // The "template<>" header is extraneous.
9979 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
9980 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
9981 isExplicitSpecialization = true;
9985 if (Invalid) return 0;
9987 bool isAllExplicitSpecializations = true;
9988 for (unsigned I = TempParamLists.size(); I-- > 0; ) {
9989 if (TempParamLists.get()[I]->size()) {
9990 isAllExplicitSpecializations = false;
9995 // FIXME: don't ignore attributes.
9997 // If it's explicit specializations all the way down, just forget
9998 // about the template header and build an appropriate non-templated
9999 // friend. TODO: for source fidelity, remember the headers.
10000 if (isAllExplicitSpecializations) {
10001 if (SS.isEmpty()) {
10002 bool Owned = false;
10003 bool IsDependent = false;
10004 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc,
10006 /*ModulePrivateLoc=*/SourceLocation(),
10007 MultiTemplateParamsArg(), Owned, IsDependent,
10008 /*ScopedEnumKWLoc=*/SourceLocation(),
10009 /*ScopedEnumUsesClassTag=*/false,
10010 /*UnderlyingType=*/TypeResult());
10013 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
10014 ElaboratedTypeKeyword Keyword
10015 = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
10016 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc,
10021 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
10022 if (isa<DependentNameType>(T)) {
10023 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc());
10024 TL.setElaboratedKeywordLoc(TagLoc);
10025 TL.setQualifierLoc(QualifierLoc);
10026 TL.setNameLoc(NameLoc);
10028 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc());
10029 TL.setElaboratedKeywordLoc(TagLoc);
10030 TL.setQualifierLoc(QualifierLoc);
10031 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc);
10034 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
10036 Friend->setAccess(AS_public);
10037 CurContext->addDecl(Friend);
10041 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?");
10045 // Handle the case of a templated-scope friend class. e.g.
10046 // template <class T> class A<T>::B;
10047 // FIXME: we don't support these right now.
10048 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
10049 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name);
10050 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
10051 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc());
10052 TL.setElaboratedKeywordLoc(TagLoc);
10053 TL.setQualifierLoc(SS.getWithLocInContext(Context));
10054 TL.setNameLoc(NameLoc);
10056 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
10058 Friend->setAccess(AS_public);
10059 Friend->setUnsupportedFriend(true);
10060 CurContext->addDecl(Friend);
10065 /// Handle a friend type declaration. This works in tandem with
10068 /// Notes on friend class templates:
10070 /// We generally treat friend class declarations as if they were
10071 /// declaring a class. So, for example, the elaborated type specifier
10072 /// in a friend declaration is required to obey the restrictions of a
10073 /// class-head (i.e. no typedefs in the scope chain), template
10074 /// parameters are required to match up with simple template-ids, &c.
10075 /// However, unlike when declaring a template specialization, it's
10076 /// okay to refer to a template specialization without an empty
10077 /// template parameter declaration, e.g.
10078 /// friend class A<T>::B<unsigned>;
10079 /// We permit this as a special case; if there are any template
10080 /// parameters present at all, require proper matching, i.e.
10081 /// template <> template <class T> friend class A<int>::B;
10082 Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
10083 MultiTemplateParamsArg TempParams) {
10084 SourceLocation Loc = DS.getLocStart();
10086 assert(DS.isFriendSpecified());
10087 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
10089 // Try to convert the decl specifier to a type. This works for
10090 // friend templates because ActOnTag never produces a ClassTemplateDecl
10091 // for a TUK_Friend.
10092 Declarator TheDeclarator(DS, Declarator::MemberContext);
10093 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S);
10094 QualType T = TSI->getType();
10095 if (TheDeclarator.isInvalidType())
10098 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration))
10101 // This is definitely an error in C++98. It's probably meant to
10102 // be forbidden in C++0x, too, but the specification is just
10105 // The problem is with declarations like the following:
10106 // template <T> friend A<T>::foo;
10107 // where deciding whether a class C is a friend or not now hinges
10108 // on whether there exists an instantiation of A that causes
10109 // 'foo' to equal C. There are restrictions on class-heads
10110 // (which we declare (by fiat) elaborated friend declarations to
10111 // be) that makes this tractable.
10113 // FIXME: handle "template <> friend class A<T>;", which
10114 // is possibly well-formed? Who even knows?
10115 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) {
10116 Diag(Loc, diag::err_tagless_friend_type_template)
10117 << DS.getSourceRange();
10121 // C++98 [class.friend]p1: A friend of a class is a function
10122 // or class that is not a member of the class . . .
10123 // This is fixed in DR77, which just barely didn't make the C++03
10124 // deadline. It's also a very silly restriction that seriously
10125 // affects inner classes and which nobody else seems to implement;
10126 // thus we never diagnose it, not even in -pedantic.
10128 // But note that we could warn about it: it's always useless to
10129 // friend one of your own members (it's not, however, worthless to
10130 // friend a member of an arbitrary specialization of your template).
10133 if (unsigned NumTempParamLists = TempParams.size())
10134 D = FriendTemplateDecl::Create(Context, CurContext, Loc,
10136 TempParams.release(),
10138 DS.getFriendSpecLoc());
10140 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI);
10145 D->setAccess(AS_public);
10146 CurContext->addDecl(D);
10151 Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D,
10152 MultiTemplateParamsArg TemplateParams) {
10153 const DeclSpec &DS = D.getDeclSpec();
10155 assert(DS.isFriendSpecified());
10156 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
10158 SourceLocation Loc = D.getIdentifierLoc();
10159 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
10161 // C++ [class.friend]p1
10162 // A friend of a class is a function or class....
10163 // Note that this sees through typedefs, which is intended.
10164 // It *doesn't* see through dependent types, which is correct
10165 // according to [temp.arg.type]p3:
10166 // If a declaration acquires a function type through a
10167 // type dependent on a template-parameter and this causes
10168 // a declaration that does not use the syntactic form of a
10169 // function declarator to have a function type, the program
10171 if (!TInfo->getType()->isFunctionType()) {
10172 Diag(Loc, diag::err_unexpected_friend);
10174 // It might be worthwhile to try to recover by creating an
10175 // appropriate declaration.
10179 // C++ [namespace.memdef]p3
10180 // - If a friend declaration in a non-local class first declares a
10181 // class or function, the friend class or function is a member
10182 // of the innermost enclosing namespace.
10183 // - The name of the friend is not found by simple name lookup
10184 // until a matching declaration is provided in that namespace
10185 // scope (either before or after the class declaration granting
10187 // - If a friend function is called, its name may be found by the
10188 // name lookup that considers functions from namespaces and
10189 // classes associated with the types of the function arguments.
10190 // - When looking for a prior declaration of a class or a function
10191 // declared as a friend, scopes outside the innermost enclosing
10192 // namespace scope are not considered.
10194 CXXScopeSpec &SS = D.getCXXScopeSpec();
10195 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
10196 DeclarationName Name = NameInfo.getName();
10199 // Check for unexpanded parameter packs.
10200 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) ||
10201 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) ||
10202 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration))
10205 // The context we found the declaration in, or in which we should
10206 // create the declaration.
10208 Scope *DCScope = S;
10209 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
10212 // FIXME: there are different rules in local classes
10214 // There are four cases here.
10215 // - There's no scope specifier, in which case we just go to the
10216 // appropriate scope and look for a function or function template
10217 // there as appropriate.
10218 // Recover from invalid scope qualifiers as if they just weren't there.
10219 if (SS.isInvalid() || !SS.isSet()) {
10220 // C++0x [namespace.memdef]p3:
10221 // If the name in a friend declaration is neither qualified nor
10222 // a template-id and the declaration is a function or an
10223 // elaborated-type-specifier, the lookup to determine whether
10224 // the entity has been previously declared shall not consider
10225 // any scopes outside the innermost enclosing namespace.
10226 // C++0x [class.friend]p11:
10227 // If a friend declaration appears in a local class and the name
10228 // specified is an unqualified name, a prior declaration is
10229 // looked up without considering scopes that are outside the
10230 // innermost enclosing non-class scope. For a friend function
10231 // declaration, if there is no prior declaration, the program is
10233 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass();
10234 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId;
10236 // Find the appropriate context according to the above.
10239 // Skip class contexts. If someone can cite chapter and verse
10240 // for this behavior, that would be nice --- it's what GCC and
10241 // EDG do, and it seems like a reasonable intent, but the spec
10242 // really only says that checks for unqualified existing
10243 // declarations should stop at the nearest enclosing namespace,
10244 // not that they should only consider the nearest enclosing
10246 while (DC->isRecord() || DC->isTransparentContext())
10247 DC = DC->getParent();
10249 LookupQualifiedName(Previous, DC);
10251 // TODO: decide what we think about using declarations.
10252 if (isLocal || !Previous.empty())
10255 if (isTemplateId) {
10256 if (isa<TranslationUnitDecl>(DC)) break;
10258 if (DC->isFileContext()) break;
10260 DC = DC->getParent();
10263 // C++ [class.friend]p1: A friend of a class is a function or
10264 // class that is not a member of the class . . .
10265 // C++11 changes this for both friend types and functions.
10266 // Most C++ 98 compilers do seem to give an error here, so
10268 if (!Previous.empty() && DC->Equals(CurContext))
10269 Diag(DS.getFriendSpecLoc(),
10270 getLangOpts().CPlusPlus0x ?
10271 diag::warn_cxx98_compat_friend_is_member :
10272 diag::err_friend_is_member);
10274 DCScope = getScopeForDeclContext(S, DC);
10276 // C++ [class.friend]p6:
10277 // A function can be defined in a friend declaration of a class if and
10278 // only if the class is a non-local class (9.8), the function name is
10279 // unqualified, and the function has namespace scope.
10280 if (isLocal && D.isFunctionDefinition()) {
10281 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class);
10284 // - There's a non-dependent scope specifier, in which case we
10285 // compute it and do a previous lookup there for a function
10286 // or function template.
10287 } else if (!SS.getScopeRep()->isDependent()) {
10288 DC = computeDeclContext(SS);
10291 if (RequireCompleteDeclContext(SS, DC)) return 0;
10293 LookupQualifiedName(Previous, DC);
10295 // Ignore things found implicitly in the wrong scope.
10296 // TODO: better diagnostics for this case. Suggesting the right
10297 // qualified scope would be nice...
10298 LookupResult::Filter F = Previous.makeFilter();
10299 while (F.hasNext()) {
10300 NamedDecl *D = F.next();
10301 if (!DC->InEnclosingNamespaceSetOf(
10302 D->getDeclContext()->getRedeclContext()))
10307 if (Previous.empty()) {
10308 D.setInvalidType();
10309 Diag(Loc, diag::err_qualified_friend_not_found)
10310 << Name << TInfo->getType();
10314 // C++ [class.friend]p1: A friend of a class is a function or
10315 // class that is not a member of the class . . .
10316 if (DC->Equals(CurContext))
10317 Diag(DS.getFriendSpecLoc(),
10318 getLangOpts().CPlusPlus0x ?
10319 diag::warn_cxx98_compat_friend_is_member :
10320 diag::err_friend_is_member);
10322 if (D.isFunctionDefinition()) {
10323 // C++ [class.friend]p6:
10324 // A function can be defined in a friend declaration of a class if and
10325 // only if the class is a non-local class (9.8), the function name is
10326 // unqualified, and the function has namespace scope.
10327 SemaDiagnosticBuilder DB
10328 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def);
10330 DB << SS.getScopeRep();
10331 if (DC->isFileContext())
10332 DB << FixItHint::CreateRemoval(SS.getRange());
10336 // - There's a scope specifier that does not match any template
10337 // parameter lists, in which case we use some arbitrary context,
10338 // create a method or method template, and wait for instantiation.
10339 // - There's a scope specifier that does match some template
10340 // parameter lists, which we don't handle right now.
10342 if (D.isFunctionDefinition()) {
10343 // C++ [class.friend]p6:
10344 // A function can be defined in a friend declaration of a class if and
10345 // only if the class is a non-local class (9.8), the function name is
10346 // unqualified, and the function has namespace scope.
10347 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def)
10348 << SS.getScopeRep();
10352 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?");
10355 if (!DC->isRecord()) {
10356 // This implies that it has to be an operator or function.
10357 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ||
10358 D.getName().getKind() == UnqualifiedId::IK_DestructorName ||
10359 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) {
10360 Diag(Loc, diag::err_introducing_special_friend) <<
10361 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 :
10362 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2);
10367 // FIXME: This is an egregious hack to cope with cases where the scope stack
10368 // does not contain the declaration context, i.e., in an out-of-line
10369 // definition of a class.
10370 Scope FakeDCScope(S, Scope::DeclScope, Diags);
10372 FakeDCScope.setEntity(DC);
10373 DCScope = &FakeDCScope;
10376 bool AddToScope = true;
10377 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous,
10378 move(TemplateParams), AddToScope);
10381 assert(ND->getDeclContext() == DC);
10382 assert(ND->getLexicalDeclContext() == CurContext);
10384 // Add the function declaration to the appropriate lookup tables,
10385 // adjusting the redeclarations list as necessary. We don't
10386 // want to do this yet if the friending class is dependent.
10388 // Also update the scope-based lookup if the target context's
10389 // lookup context is in lexical scope.
10390 if (!CurContext->isDependentContext()) {
10391 DC = DC->getRedeclContext();
10392 DC->makeDeclVisibleInContext(ND);
10393 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
10394 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false);
10397 FriendDecl *FrD = FriendDecl::Create(Context, CurContext,
10398 D.getIdentifierLoc(), ND,
10399 DS.getFriendSpecLoc());
10400 FrD->setAccess(AS_public);
10401 CurContext->addDecl(FrD);
10403 if (ND->isInvalidDecl())
10404 FrD->setInvalidDecl();
10407 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND))
10408 FD = FTD->getTemplatedDecl();
10410 FD = cast<FunctionDecl>(ND);
10412 // Mark templated-scope function declarations as unsupported.
10413 if (FD->getNumTemplateParameterLists())
10414 FrD->setUnsupportedFriend(true);
10420 void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) {
10421 AdjustDeclIfTemplate(Dcl);
10423 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl);
10425 Diag(DelLoc, diag::err_deleted_non_function);
10428 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) {
10429 Diag(DelLoc, diag::err_deleted_decl_not_first);
10430 Diag(Prev->getLocation(), diag::note_previous_declaration);
10431 // If the declaration wasn't the first, we delete the function anyway for
10434 Fn->setDeletedAsWritten();
10436 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl);
10440 // A deleted special member function is trivial if the corresponding
10441 // implicitly-declared function would have been.
10442 switch (getSpecialMember(MD)) {
10445 case CXXDefaultConstructor:
10446 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor());
10448 case CXXCopyConstructor:
10449 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor());
10451 case CXXMoveConstructor:
10452 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor());
10454 case CXXCopyAssignment:
10455 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment());
10457 case CXXMoveAssignment:
10458 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment());
10460 case CXXDestructor:
10461 MD->setTrivial(MD->getParent()->hasTrivialDestructor());
10466 void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) {
10467 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl);
10470 if (MD->getParent()->isDependentType()) {
10471 MD->setDefaulted();
10472 MD->setExplicitlyDefaulted();
10476 CXXSpecialMember Member = getSpecialMember(MD);
10477 if (Member == CXXInvalid) {
10478 Diag(DefaultLoc, diag::err_default_special_members);
10482 MD->setDefaulted();
10483 MD->setExplicitlyDefaulted();
10485 // If this definition appears within the record, do the checking when
10486 // the record is complete.
10487 const FunctionDecl *Primary = MD;
10488 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate)
10489 // Find the uninstantiated declaration that actually had the '= default'
10491 MD->getTemplateInstantiationPattern()->isDefined(Primary);
10493 if (Primary == Primary->getCanonicalDecl())
10497 case CXXDefaultConstructor: {
10498 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD);
10499 CheckExplicitlyDefaultedDefaultConstructor(CD);
10500 if (!CD->isInvalidDecl())
10501 DefineImplicitDefaultConstructor(DefaultLoc, CD);
10505 case CXXCopyConstructor: {
10506 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD);
10507 CheckExplicitlyDefaultedCopyConstructor(CD);
10508 if (!CD->isInvalidDecl())
10509 DefineImplicitCopyConstructor(DefaultLoc, CD);
10513 case CXXCopyAssignment: {
10514 CheckExplicitlyDefaultedCopyAssignment(MD);
10515 if (!MD->isInvalidDecl())
10516 DefineImplicitCopyAssignment(DefaultLoc, MD);
10520 case CXXDestructor: {
10521 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD);
10522 CheckExplicitlyDefaultedDestructor(DD);
10523 if (!DD->isInvalidDecl())
10524 DefineImplicitDestructor(DefaultLoc, DD);
10528 case CXXMoveConstructor: {
10529 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD);
10530 CheckExplicitlyDefaultedMoveConstructor(CD);
10531 if (!CD->isInvalidDecl())
10532 DefineImplicitMoveConstructor(DefaultLoc, CD);
10536 case CXXMoveAssignment: {
10537 CheckExplicitlyDefaultedMoveAssignment(MD);
10538 if (!MD->isInvalidDecl())
10539 DefineImplicitMoveAssignment(DefaultLoc, MD);
10544 llvm_unreachable("Invalid special member.");
10547 Diag(DefaultLoc, diag::err_default_special_members);
10551 static void SearchForReturnInStmt(Sema &Self, Stmt *S) {
10552 for (Stmt::child_range CI = S->children(); CI; ++CI) {
10553 Stmt *SubStmt = *CI;
10556 if (isa<ReturnStmt>(SubStmt))
10557 Self.Diag(SubStmt->getLocStart(),
10558 diag::err_return_in_constructor_handler);
10559 if (!isa<Expr>(SubStmt))
10560 SearchForReturnInStmt(Self, SubStmt);
10564 void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) {
10565 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) {
10566 CXXCatchStmt *Handler = TryBlock->getHandler(I);
10567 SearchForReturnInStmt(*this, Handler);
10571 bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
10572 const CXXMethodDecl *Old) {
10573 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType();
10574 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType();
10576 if (Context.hasSameType(NewTy, OldTy) ||
10577 NewTy->isDependentType() || OldTy->isDependentType())
10580 // Check if the return types are covariant
10581 QualType NewClassTy, OldClassTy;
10583 /// Both types must be pointers or references to classes.
10584 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) {
10585 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) {
10586 NewClassTy = NewPT->getPointeeType();
10587 OldClassTy = OldPT->getPointeeType();
10589 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) {
10590 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) {
10591 if (NewRT->getTypeClass() == OldRT->getTypeClass()) {
10592 NewClassTy = NewRT->getPointeeType();
10593 OldClassTy = OldRT->getPointeeType();
10598 // The return types aren't either both pointers or references to a class type.
10599 if (NewClassTy.isNull()) {
10600 Diag(New->getLocation(),
10601 diag::err_different_return_type_for_overriding_virtual_function)
10602 << New->getDeclName() << NewTy << OldTy;
10603 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
10608 // C++ [class.virtual]p6:
10609 // If the return type of D::f differs from the return type of B::f, the
10610 // class type in the return type of D::f shall be complete at the point of
10611 // declaration of D::f or shall be the class type D.
10612 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) {
10613 if (!RT->isBeingDefined() &&
10614 RequireCompleteType(New->getLocation(), NewClassTy,
10615 PDiag(diag::err_covariant_return_incomplete)
10616 << New->getDeclName()))
10620 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) {
10621 // Check if the new class derives from the old class.
10622 if (!IsDerivedFrom(NewClassTy, OldClassTy)) {
10623 Diag(New->getLocation(),
10624 diag::err_covariant_return_not_derived)
10625 << New->getDeclName() << NewTy << OldTy;
10626 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
10630 // Check if we the conversion from derived to base is valid.
10631 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy,
10632 diag::err_covariant_return_inaccessible_base,
10633 diag::err_covariant_return_ambiguous_derived_to_base_conv,
10634 // FIXME: Should this point to the return type?
10635 New->getLocation(), SourceRange(), New->getDeclName(), 0)) {
10636 // FIXME: this note won't trigger for delayed access control
10637 // diagnostics, and it's impossible to get an undelayed error
10638 // here from access control during the original parse because
10639 // the ParsingDeclSpec/ParsingDeclarator are still in scope.
10640 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
10645 // The qualifiers of the return types must be the same.
10646 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) {
10647 Diag(New->getLocation(),
10648 diag::err_covariant_return_type_different_qualifications)
10649 << New->getDeclName() << NewTy << OldTy;
10650 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
10655 // The new class type must have the same or less qualifiers as the old type.
10656 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) {
10657 Diag(New->getLocation(),
10658 diag::err_covariant_return_type_class_type_more_qualified)
10659 << New->getDeclName() << NewTy << OldTy;
10660 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
10667 /// \brief Mark the given method pure.
10669 /// \param Method the method to be marked pure.
10671 /// \param InitRange the source range that covers the "0" initializer.
10672 bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) {
10673 SourceLocation EndLoc = InitRange.getEnd();
10674 if (EndLoc.isValid())
10675 Method->setRangeEnd(EndLoc);
10677 if (Method->isVirtual() || Method->getParent()->isDependentContext()) {
10682 if (!Method->isInvalidDecl())
10683 Diag(Method->getLocation(), diag::err_non_virtual_pure)
10684 << Method->getDeclName() << InitRange;
10688 /// \brief Determine whether the given declaration is a static data member.
10689 static bool isStaticDataMember(Decl *D) {
10690 VarDecl *Var = dyn_cast_or_null<VarDecl>(D);
10694 return Var->isStaticDataMember();
10696 /// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse
10697 /// an initializer for the out-of-line declaration 'Dcl'. The scope
10698 /// is a fresh scope pushed for just this purpose.
10700 /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
10701 /// static data member of class X, names should be looked up in the scope of
10703 void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) {
10704 // If there is no declaration, there was an error parsing it.
10705 if (D == 0 || D->isInvalidDecl()) return;
10707 // We should only get called for declarations with scope specifiers, like:
10709 assert(D->isOutOfLine());
10710 EnterDeclaratorContext(S, D->getDeclContext());
10712 // If we are parsing the initializer for a static data member, push a
10713 // new expression evaluation context that is associated with this static
10715 if (isStaticDataMember(D))
10716 PushExpressionEvaluationContext(PotentiallyEvaluated, D);
10719 /// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an
10720 /// initializer for the out-of-line declaration 'D'.
10721 void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) {
10722 // If there is no declaration, there was an error parsing it.
10723 if (D == 0 || D->isInvalidDecl()) return;
10725 if (isStaticDataMember(D))
10726 PopExpressionEvaluationContext();
10728 assert(D->isOutOfLine());
10729 ExitDeclaratorContext(S);
10732 /// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a
10733 /// C++ if/switch/while/for statement.
10734 /// e.g: "if (int x = f()) {...}"
10735 DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) {
10737 // The declarator shall not specify a function or an array.
10738 // The type-specifier-seq shall not contain typedef and shall not declare a
10739 // new class or enumeration.
10740 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
10741 "Parser allowed 'typedef' as storage class of condition decl.");
10743 Decl *Dcl = ActOnDeclarator(S, D);
10747 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function.
10748 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type)
10749 << D.getSourceRange();
10756 void Sema::LoadExternalVTableUses() {
10757 if (!ExternalSource)
10760 SmallVector<ExternalVTableUse, 4> VTables;
10761 ExternalSource->ReadUsedVTables(VTables);
10762 SmallVector<VTableUse, 4> NewUses;
10763 for (unsigned I = 0, N = VTables.size(); I != N; ++I) {
10764 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos
10765 = VTablesUsed.find(VTables[I].Record);
10766 // Even if a definition wasn't required before, it may be required now.
10767 if (Pos != VTablesUsed.end()) {
10768 if (!Pos->second && VTables[I].DefinitionRequired)
10769 Pos->second = true;
10773 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired;
10774 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location));
10777 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end());
10780 void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class,
10781 bool DefinitionRequired) {
10782 // Ignore any vtable uses in unevaluated operands or for classes that do
10783 // not have a vtable.
10784 if (!Class->isDynamicClass() || Class->isDependentContext() ||
10785 CurContext->isDependentContext() ||
10786 ExprEvalContexts.back().Context == Unevaluated)
10789 // Try to insert this class into the map.
10790 LoadExternalVTableUses();
10791 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl());
10792 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool>
10793 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired));
10795 // If we already had an entry, check to see if we are promoting this vtable
10796 // to required a definition. If so, we need to reappend to the VTableUses
10797 // list, since we may have already processed the first entry.
10798 if (DefinitionRequired && !Pos.first->second) {
10799 Pos.first->second = true;
10801 // Otherwise, we can early exit.
10806 // Local classes need to have their virtual members marked
10807 // immediately. For all other classes, we mark their virtual members
10808 // at the end of the translation unit.
10809 if (Class->isLocalClass())
10810 MarkVirtualMembersReferenced(Loc, Class);
10812 VTableUses.push_back(std::make_pair(Class, Loc));
10815 bool Sema::DefineUsedVTables() {
10816 LoadExternalVTableUses();
10817 if (VTableUses.empty())
10820 // Note: The VTableUses vector could grow as a result of marking
10821 // the members of a class as "used", so we check the size each
10822 // time through the loop and prefer indices (with are stable) to
10823 // iterators (which are not).
10824 bool DefinedAnything = false;
10825 for (unsigned I = 0; I != VTableUses.size(); ++I) {
10826 CXXRecordDecl *Class = VTableUses[I].first->getDefinition();
10830 SourceLocation Loc = VTableUses[I].second;
10832 // If this class has a key function, but that key function is
10833 // defined in another translation unit, we don't need to emit the
10834 // vtable even though we're using it.
10835 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class);
10836 if (KeyFunction && !KeyFunction->hasBody()) {
10837 switch (KeyFunction->getTemplateSpecializationKind()) {
10838 case TSK_Undeclared:
10839 case TSK_ExplicitSpecialization:
10840 case TSK_ExplicitInstantiationDeclaration:
10841 // The key function is in another translation unit.
10844 case TSK_ExplicitInstantiationDefinition:
10845 case TSK_ImplicitInstantiation:
10846 // We will be instantiating the key function.
10849 } else if (!KeyFunction) {
10850 // If we have a class with no key function that is the subject
10851 // of an explicit instantiation declaration, suppress the
10852 // vtable; it will live with the explicit instantiation
10854 bool IsExplicitInstantiationDeclaration
10855 = Class->getTemplateSpecializationKind()
10856 == TSK_ExplicitInstantiationDeclaration;
10857 for (TagDecl::redecl_iterator R = Class->redecls_begin(),
10858 REnd = Class->redecls_end();
10860 TemplateSpecializationKind TSK
10861 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind();
10862 if (TSK == TSK_ExplicitInstantiationDeclaration)
10863 IsExplicitInstantiationDeclaration = true;
10864 else if (TSK == TSK_ExplicitInstantiationDefinition) {
10865 IsExplicitInstantiationDeclaration = false;
10870 if (IsExplicitInstantiationDeclaration)
10874 // Mark all of the virtual members of this class as referenced, so
10875 // that we can build a vtable. Then, tell the AST consumer that a
10876 // vtable for this class is required.
10877 DefinedAnything = true;
10878 MarkVirtualMembersReferenced(Loc, Class);
10879 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl());
10880 Consumer.HandleVTable(Class, VTablesUsed[Canonical]);
10882 // Optionally warn if we're emitting a weak vtable.
10883 if (Class->getLinkage() == ExternalLinkage &&
10884 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) {
10885 const FunctionDecl *KeyFunctionDef = 0;
10886 if (!KeyFunction ||
10887 (KeyFunction->hasBody(KeyFunctionDef) &&
10888 KeyFunctionDef->isInlined()))
10889 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() ==
10890 TSK_ExplicitInstantiationDefinition
10891 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable)
10895 VTableUses.clear();
10897 return DefinedAnything;
10900 void Sema::MarkVirtualMembersReferenced(SourceLocation Loc,
10901 const CXXRecordDecl *RD) {
10902 for (CXXRecordDecl::method_iterator i = RD->method_begin(),
10903 e = RD->method_end(); i != e; ++i) {
10904 CXXMethodDecl *MD = *i;
10906 // C++ [basic.def.odr]p2:
10907 // [...] A virtual member function is used if it is not pure. [...]
10908 if (MD->isVirtual() && !MD->isPure())
10909 MarkFunctionReferenced(Loc, MD);
10912 // Only classes that have virtual bases need a VTT.
10913 if (RD->getNumVBases() == 0)
10916 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(),
10917 e = RD->bases_end(); i != e; ++i) {
10918 const CXXRecordDecl *Base =
10919 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl());
10920 if (Base->getNumVBases() == 0)
10922 MarkVirtualMembersReferenced(Loc, Base);
10926 /// SetIvarInitializers - This routine builds initialization ASTs for the
10927 /// Objective-C implementation whose ivars need be initialized.
10928 void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) {
10929 if (!getLangOpts().CPlusPlus)
10931 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) {
10932 SmallVector<ObjCIvarDecl*, 8> ivars;
10933 CollectIvarsToConstructOrDestruct(OID, ivars);
10936 SmallVector<CXXCtorInitializer*, 32> AllToInit;
10937 for (unsigned i = 0; i < ivars.size(); i++) {
10938 FieldDecl *Field = ivars[i];
10939 if (Field->isInvalidDecl())
10942 CXXCtorInitializer *Member;
10943 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field);
10944 InitializationKind InitKind =
10945 InitializationKind::CreateDefault(ObjCImplementation->getLocation());
10947 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0);
10948 ExprResult MemberInit =
10949 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg());
10950 MemberInit = MaybeCreateExprWithCleanups(MemberInit);
10951 // Note, MemberInit could actually come back empty if no initialization
10952 // is required (e.g., because it would call a trivial default constructor)
10953 if (!MemberInit.get() || MemberInit.isInvalid())
10957 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(),
10959 MemberInit.takeAs<Expr>(),
10961 AllToInit.push_back(Member);
10963 // Be sure that the destructor is accessible and is marked as referenced.
10964 if (const RecordType *RecordTy
10965 = Context.getBaseElementType(Field->getType())
10966 ->getAs<RecordType>()) {
10967 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl());
10968 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) {
10969 MarkFunctionReferenced(Field->getLocation(), Destructor);
10970 CheckDestructorAccess(Field->getLocation(), Destructor,
10971 PDiag(diag::err_access_dtor_ivar)
10972 << Context.getBaseElementType(Field->getType()));
10976 ObjCImplementation->setIvarInitializers(Context,
10977 AllToInit.data(), AllToInit.size());
10982 void DelegatingCycleHelper(CXXConstructorDecl* Ctor,
10983 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid,
10984 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid,
10985 llvm::SmallSet<CXXConstructorDecl*, 4> &Current,
10987 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(),
10988 CE = Current.end();
10989 if (Ctor->isInvalidDecl())
10992 const FunctionDecl *FNTarget = 0;
10993 CXXConstructorDecl *Target;
10995 // We ignore the result here since if we don't have a body, Target will be
10997 (void)Ctor->getTargetConstructor()->hasBody(FNTarget);
10999 = const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget));
11001 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(),
11002 // Avoid dereferencing a null pointer here.
11003 *TCanonical = Target ? Target->getCanonicalDecl() : 0;
11005 if (!Current.insert(Canonical))
11008 // We know that beyond here, we aren't chaining into a cycle.
11009 if (!Target || !Target->isDelegatingConstructor() ||
11010 Target->isInvalidDecl() || Valid.count(TCanonical)) {
11011 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI)
11014 // We've hit a cycle.
11015 } else if (TCanonical == Canonical || Invalid.count(TCanonical) ||
11016 Current.count(TCanonical)) {
11017 // If we haven't diagnosed this cycle yet, do so now.
11018 if (!Invalid.count(TCanonical)) {
11019 S.Diag((*Ctor->init_begin())->getSourceLocation(),
11020 diag::warn_delegating_ctor_cycle)
11023 // Don't add a note for a function delegating directo to itself.
11024 if (TCanonical != Canonical)
11025 S.Diag(Target->getLocation(), diag::note_it_delegates_to);
11027 CXXConstructorDecl *C = Target;
11028 while (C->getCanonicalDecl() != Canonical) {
11029 (void)C->getTargetConstructor()->hasBody(FNTarget);
11030 assert(FNTarget && "Ctor cycle through bodiless function");
11033 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget));
11034 S.Diag(C->getLocation(), diag::note_which_delegates_to);
11038 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI)
11039 Invalid.insert(*CI);
11042 DelegatingCycleHelper(Target, Valid, Invalid, Current, S);
11047 void Sema::CheckDelegatingCtorCycles() {
11048 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current;
11050 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(),
11051 CE = Current.end();
11053 for (DelegatingCtorDeclsType::iterator
11054 I = DelegatingCtorDecls.begin(ExternalSource),
11055 E = DelegatingCtorDecls.end();
11057 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this);
11060 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI)
11061 (*CI)->setInvalidDecl();
11065 /// \brief AST visitor that finds references to the 'this' expression.
11066 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> {
11070 explicit FindCXXThisExpr(Sema &S) : S(S) { }
11072 bool VisitCXXThisExpr(CXXThisExpr *E) {
11073 S.Diag(E->getLocation(), diag::err_this_static_member_func)
11074 << E->isImplicit();
11080 bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) {
11081 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
11085 TypeLoc TL = TSInfo->getTypeLoc();
11086 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL);
11090 // C++11 [expr.prim.general]p3:
11091 // [The expression this] shall not appear before the optional
11092 // cv-qualifier-seq and it shall not appear within the declaration of a
11093 // static member function (although its type and value category are defined
11094 // within a static member function as they are within a non-static member
11095 // function). [ Note: this is because declaration matching does not occur
11096 // until the complete declarator is known. - end note ]
11097 const FunctionProtoType *Proto = ProtoTL->getTypePtr();
11098 FindCXXThisExpr Finder(*this);
11100 // If the return type came after the cv-qualifier-seq, check it now.
11101 if (Proto->hasTrailingReturn() &&
11102 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc()))
11105 // Check the exception specification.
11106 if (checkThisInStaticMemberFunctionExceptionSpec(Method))
11109 return checkThisInStaticMemberFunctionAttributes(Method);
11112 bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) {
11113 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
11117 TypeLoc TL = TSInfo->getTypeLoc();
11118 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL);
11122 const FunctionProtoType *Proto = ProtoTL->getTypePtr();
11123 FindCXXThisExpr Finder(*this);
11125 switch (Proto->getExceptionSpecType()) {
11126 case EST_Uninstantiated:
11127 case EST_BasicNoexcept:
11129 case EST_DynamicNone:
11134 case EST_ComputedNoexcept:
11135 if (!Finder.TraverseStmt(Proto->getNoexceptExpr()))
11139 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(),
11140 EEnd = Proto->exception_end();
11142 if (!Finder.TraverseType(*E))
11151 bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) {
11152 FindCXXThisExpr Finder(*this);
11154 // Check attributes.
11155 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end();
11157 // FIXME: This should be emitted by tblgen.
11159 ArrayRef<Expr *> Args;
11160 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A))
11162 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A))
11164 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A))
11165 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size());
11166 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A))
11167 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size());
11168 else if (ExclusiveLockFunctionAttr *ELF
11169 = dyn_cast<ExclusiveLockFunctionAttr>(*A))
11170 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size());
11171 else if (SharedLockFunctionAttr *SLF
11172 = dyn_cast<SharedLockFunctionAttr>(*A))
11173 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size());
11174 else if (ExclusiveTrylockFunctionAttr *ETLF
11175 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) {
11176 Arg = ETLF->getSuccessValue();
11177 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size());
11178 } else if (SharedTrylockFunctionAttr *STLF
11179 = dyn_cast<SharedTrylockFunctionAttr>(*A)) {
11180 Arg = STLF->getSuccessValue();
11181 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size());
11182 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A))
11183 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size());
11184 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A))
11185 Arg = LR->getArg();
11186 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A))
11187 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size());
11188 else if (ExclusiveLocksRequiredAttr *ELR
11189 = dyn_cast<ExclusiveLocksRequiredAttr>(*A))
11190 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size());
11191 else if (SharedLocksRequiredAttr *SLR
11192 = dyn_cast<SharedLocksRequiredAttr>(*A))
11193 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size());
11195 if (Arg && !Finder.TraverseStmt(Arg))
11198 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
11199 if (!Finder.TraverseStmt(Args[I]))
11208 Sema::checkExceptionSpecification(ExceptionSpecificationType EST,
11209 ArrayRef<ParsedType> DynamicExceptions,
11210 ArrayRef<SourceRange> DynamicExceptionRanges,
11211 Expr *NoexceptExpr,
11212 llvm::SmallVectorImpl<QualType> &Exceptions,
11213 FunctionProtoType::ExtProtoInfo &EPI) {
11214 Exceptions.clear();
11215 EPI.ExceptionSpecType = EST;
11216 if (EST == EST_Dynamic) {
11217 Exceptions.reserve(DynamicExceptions.size());
11218 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) {
11219 // FIXME: Preserve type source info.
11220 QualType ET = GetTypeFromParser(DynamicExceptions[ei]);
11222 SmallVector<UnexpandedParameterPack, 2> Unexpanded;
11223 collectUnexpandedParameterPacks(ET, Unexpanded);
11224 if (!Unexpanded.empty()) {
11225 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(),
11226 UPPC_ExceptionType,
11231 // Check that the type is valid for an exception spec, and
11233 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei]))
11234 Exceptions.push_back(ET);
11236 EPI.NumExceptions = Exceptions.size();
11237 EPI.Exceptions = Exceptions.data();
11241 if (EST == EST_ComputedNoexcept) {
11242 // If an error occurred, there's no expression here.
11243 if (NoexceptExpr) {
11244 assert((NoexceptExpr->isTypeDependent() ||
11245 NoexceptExpr->getType()->getCanonicalTypeUnqualified() ==
11247 "Parser should have made sure that the expression is boolean");
11248 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) {
11249 EPI.ExceptionSpecType = EST_BasicNoexcept;
11253 if (!NoexceptExpr->isValueDependent())
11254 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0,
11255 PDiag(diag::err_noexcept_needs_constant_expression),
11256 /*AllowFold*/ false).take();
11257 EPI.NoexceptExpr = NoexceptExpr;
11263 void Sema::actOnDelayedExceptionSpecification(Decl *MethodD,
11264 ExceptionSpecificationType EST,
11265 SourceRange SpecificationRange,
11266 ArrayRef<ParsedType> DynamicExceptions,
11267 ArrayRef<SourceRange> DynamicExceptionRanges,
11268 Expr *NoexceptExpr) {
11272 // Dig out the method we're referring to.
11273 CXXMethodDecl *Method = 0;
11274 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(MethodD))
11275 Method = dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl());
11277 Method = dyn_cast<CXXMethodDecl>(MethodD);
11282 // Dig out the prototype. This should never fail.
11283 const FunctionProtoType *Proto
11284 = dyn_cast<FunctionProtoType>(Method->getType());
11288 // Check the exception specification.
11289 llvm::SmallVector<QualType, 4> Exceptions;
11290 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
11291 checkExceptionSpecification(EST, DynamicExceptions, DynamicExceptionRanges,
11292 NoexceptExpr, Exceptions, EPI);
11294 // Rebuild the function type.
11295 QualType T = Context.getFunctionType(Proto->getResultType(),
11296 Proto->arg_type_begin(),
11297 Proto->getNumArgs(),
11299 if (TypeSourceInfo *TSInfo = Method->getTypeSourceInfo()) {
11300 // FIXME: When we get proper type location information for exceptions,
11301 // we'll also have to rebuild the TypeSourceInfo. For now, we just patch
11302 // up the TypeSourceInfo;
11303 assert(TypeLoc::getFullDataSizeForType(T)
11304 == TypeLoc::getFullDataSizeForType(Method->getType()) &&
11305 "TypeLoc size mismatch with delayed exception specification");
11306 TSInfo->overrideType(T);
11309 Method->setType(T);
11311 if (Method->isStatic())
11312 checkThisInStaticMemberFunctionExceptionSpec(Method);
11314 if (Method->isVirtual()) {
11315 // Check overrides, which we previously had to delay.
11316 for (CXXMethodDecl::method_iterator O = Method->begin_overridden_methods(),
11317 OEnd = Method->end_overridden_methods();
11319 CheckOverridingFunctionExceptionSpec(Method, *O);
11323 /// IdentifyCUDATarget - Determine the CUDA compilation target for this function
11324 Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) {
11325 // Implicitly declared functions (e.g. copy constructors) are
11326 // __host__ __device__
11327 if (D->isImplicit())
11328 return CFT_HostDevice;
11330 if (D->hasAttr<CUDAGlobalAttr>())
11333 if (D->hasAttr<CUDADeviceAttr>()) {
11334 if (D->hasAttr<CUDAHostAttr>())
11335 return CFT_HostDevice;
11343 bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget,
11344 CUDAFunctionTarget CalleeTarget) {
11345 // CUDA B.1.1 "The __device__ qualifier declares a function that is...
11346 // Callable from the device only."
11347 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device)
11350 // CUDA B.1.2 "The __global__ qualifier declares a function that is...
11351 // Callable from the host only."
11352 // CUDA B.1.3 "The __host__ qualifier declares a function that is...
11353 // Callable from the host only."
11354 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) &&
11355 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global))
11358 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice)