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/EvaluatedExprVisitor.h"
27 #include "clang/AST/ExprCXX.h"
28 #include "clang/AST/RecordLayout.h"
29 #include "clang/AST/RecursiveASTVisitor.h"
30 #include "clang/AST/StmtVisitor.h"
31 #include "clang/AST/TypeLoc.h"
32 #include "clang/AST/TypeOrdering.h"
33 #include "clang/Sema/DeclSpec.h"
34 #include "clang/Sema/ParsedTemplate.h"
35 #include "clang/Basic/PartialDiagnostic.h"
36 #include "clang/Lex/Preprocessor.h"
37 #include "llvm/ADT/SmallString.h"
38 #include "llvm/ADT/STLExtras.h"
42 using namespace clang;
44 //===----------------------------------------------------------------------===//
45 // CheckDefaultArgumentVisitor
46 //===----------------------------------------------------------------------===//
49 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses
50 /// the default argument of a parameter to determine whether it
51 /// contains any ill-formed subexpressions. For example, this will
52 /// diagnose the use of local variables or parameters within the
53 /// default argument expression.
54 class CheckDefaultArgumentVisitor
55 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> {
60 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
61 : DefaultArg(defarg), S(s) {}
63 bool VisitExpr(Expr *Node);
64 bool VisitDeclRefExpr(DeclRefExpr *DRE);
65 bool VisitCXXThisExpr(CXXThisExpr *ThisE);
66 bool VisitLambdaExpr(LambdaExpr *Lambda);
69 /// VisitExpr - Visit all of the children of this expression.
70 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) {
71 bool IsInvalid = false;
72 for (Stmt::child_range I = Node->children(); I; ++I)
73 IsInvalid |= Visit(*I);
77 /// VisitDeclRefExpr - Visit a reference to a declaration, to
78 /// determine whether this declaration can be used in the default
79 /// argument expression.
80 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) {
81 NamedDecl *Decl = DRE->getDecl();
82 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) {
83 // C++ [dcl.fct.default]p9
84 // Default arguments are evaluated each time the function is
85 // called. The order of evaluation of function arguments is
86 // unspecified. Consequently, parameters of a function shall not
87 // be used in default argument expressions, even if they are not
88 // evaluated. Parameters of a function declared before a default
89 // argument expression are in scope and can hide namespace and
90 // class member names.
91 return S->Diag(DRE->getLocStart(),
92 diag::err_param_default_argument_references_param)
93 << Param->getDeclName() << DefaultArg->getSourceRange();
94 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) {
95 // C++ [dcl.fct.default]p7
96 // Local variables shall not be used in default argument
98 if (VDecl->isLocalVarDecl())
99 return S->Diag(DRE->getLocStart(),
100 diag::err_param_default_argument_references_local)
101 << VDecl->getDeclName() << DefaultArg->getSourceRange();
107 /// VisitCXXThisExpr - Visit a C++ "this" expression.
108 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) {
109 // C++ [dcl.fct.default]p8:
110 // The keyword this shall not be used in a default argument of a
112 return S->Diag(ThisE->getLocStart(),
113 diag::err_param_default_argument_references_this)
114 << ThisE->getSourceRange();
117 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) {
118 // C++11 [expr.lambda.prim]p13:
119 // A lambda-expression appearing in a default argument shall not
120 // implicitly or explicitly capture any entity.
121 if (Lambda->capture_begin() == Lambda->capture_end())
124 return S->Diag(Lambda->getLocStart(),
125 diag::err_lambda_capture_default_arg);
129 void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc,
130 CXXMethodDecl *Method) {
131 // If we have an MSAny spec already, don't bother.
132 if (!Method || ComputedEST == EST_MSAny)
135 const FunctionProtoType *Proto
136 = Method->getType()->getAs<FunctionProtoType>();
137 Proto = Self->ResolveExceptionSpec(CallLoc, Proto);
141 ExceptionSpecificationType EST = Proto->getExceptionSpecType();
143 // If this function can throw any exceptions, make a note of that.
144 if (EST == EST_MSAny || EST == EST_None) {
150 // FIXME: If the call to this decl is using any of its default arguments, we
151 // need to search them for potentially-throwing calls.
153 // If this function has a basic noexcept, it doesn't affect the outcome.
154 if (EST == EST_BasicNoexcept)
157 // If we have a throw-all spec at this point, ignore the function.
158 if (ComputedEST == EST_None)
161 // If we're still at noexcept(true) and there's a nothrow() callee,
162 // change to that specification.
163 if (EST == EST_DynamicNone) {
164 if (ComputedEST == EST_BasicNoexcept)
165 ComputedEST = EST_DynamicNone;
169 // Check out noexcept specs.
170 if (EST == EST_ComputedNoexcept) {
171 FunctionProtoType::NoexceptResult NR =
172 Proto->getNoexceptSpec(Self->Context);
173 assert(NR != FunctionProtoType::NR_NoNoexcept &&
174 "Must have noexcept result for EST_ComputedNoexcept.");
175 assert(NR != FunctionProtoType::NR_Dependent &&
176 "Should not generate implicit declarations for dependent cases, "
177 "and don't know how to handle them anyway.");
179 // noexcept(false) -> no spec on the new function
180 if (NR == FunctionProtoType::NR_Throw) {
182 ComputedEST = EST_None;
184 // noexcept(true) won't change anything either.
188 assert(EST == EST_Dynamic && "EST case not considered earlier.");
189 assert(ComputedEST != EST_None &&
190 "Shouldn't collect exceptions when throw-all is guaranteed.");
191 ComputedEST = EST_Dynamic;
192 // Record the exceptions in this function's exception specification.
193 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(),
194 EEnd = Proto->exception_end();
196 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E)))
197 Exceptions.push_back(*E);
200 void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) {
201 if (!E || ComputedEST == EST_MSAny)
206 // C++0x [except.spec]p14:
207 // [An] implicit exception-specification specifies the type-id T if and
208 // only if T is allowed by the exception-specification of a function directly
209 // invoked by f's implicit definition; f shall allow all exceptions if any
210 // function it directly invokes allows all exceptions, and f shall allow no
211 // exceptions if every function it directly invokes allows no exceptions.
213 // Note in particular that if an implicit exception-specification is generated
214 // for a function containing a throw-expression, that specification can still
215 // be noexcept(true).
217 // Note also that 'directly invoked' is not defined in the standard, and there
218 // is no indication that we should only consider potentially-evaluated calls.
220 // Ultimately we should implement the intent of the standard: the exception
221 // specification should be the set of exceptions which can be thrown by the
222 // implicit definition. For now, we assume that any non-nothrow expression can
223 // throw any exception.
225 if (Self->canThrow(E))
226 ComputedEST = EST_None;
230 Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg,
231 SourceLocation EqualLoc) {
232 if (RequireCompleteType(Param->getLocation(), Param->getType(),
233 diag::err_typecheck_decl_incomplete_type)) {
234 Param->setInvalidDecl();
238 // C++ [dcl.fct.default]p5
239 // A default argument expression is implicitly converted (clause
240 // 4) to the parameter type. The default argument expression has
241 // the same semantic constraints as the initializer expression in
242 // a declaration of a variable of the parameter type, using the
243 // copy-initialization semantics (8.5).
244 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
246 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(),
248 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1);
249 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg);
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 diag::err_constexpr_non_literal_param,
671 ArgIndex+1, PD->getSourceRange(),
672 isa<CXXConstructorDecl>(FD)))
678 /// \brief Get diagnostic %select index for tag kind for
679 /// record diagnostic message.
680 /// WARNING: Indexes apply to particular diagnostics only!
682 /// \returns diagnostic %select index.
683 static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) {
685 case TTK_Struct: return 0;
686 case TTK_Interface: return 1;
687 case TTK_Class: return 2;
688 default: llvm_unreachable("Invalid tag kind for record diagnostic!");
692 // CheckConstexprFunctionDecl - Check whether a function declaration satisfies
693 // the requirements of a constexpr function definition or a constexpr
694 // constructor definition. If so, return true. If not, produce appropriate
695 // diagnostics and return false.
697 // This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360.
698 bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) {
699 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
700 if (MD && MD->isInstance()) {
701 // C++11 [dcl.constexpr]p4:
702 // The definition of a constexpr constructor shall satisfy the following
704 // - the class shall not have any virtual base classes;
705 const CXXRecordDecl *RD = MD->getParent();
706 if (RD->getNumVBases()) {
707 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base)
708 << isa<CXXConstructorDecl>(NewFD)
709 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases();
710 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(),
711 E = RD->vbases_end(); I != E; ++I)
712 Diag(I->getLocStart(),
713 diag::note_constexpr_virtual_base_here) << I->getSourceRange();
718 if (!isa<CXXConstructorDecl>(NewFD)) {
719 // C++11 [dcl.constexpr]p3:
720 // The definition of a constexpr function shall satisfy the following
722 // - it shall not be virtual;
723 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD);
724 if (Method && Method->isVirtual()) {
725 Diag(NewFD->getLocation(), diag::err_constexpr_virtual);
727 // If it's not obvious why this function is virtual, find an overridden
728 // function which uses the 'virtual' keyword.
729 const CXXMethodDecl *WrittenVirtual = Method;
730 while (!WrittenVirtual->isVirtualAsWritten())
731 WrittenVirtual = *WrittenVirtual->begin_overridden_methods();
732 if (WrittenVirtual != Method)
733 Diag(WrittenVirtual->getLocation(),
734 diag::note_overridden_virtual_function);
738 // - its return type shall be a literal type;
739 QualType RT = NewFD->getResultType();
740 if (!RT->isDependentType() &&
741 RequireLiteralType(NewFD->getLocation(), RT,
742 diag::err_constexpr_non_literal_return))
746 // - each of its parameter types shall be a literal type;
747 if (!CheckConstexprParameterTypes(*this, NewFD))
753 /// Check the given declaration statement is legal within a constexpr function
754 /// body. C++0x [dcl.constexpr]p3,p4.
756 /// \return true if the body is OK, false if we have diagnosed a problem.
757 static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl,
759 // C++0x [dcl.constexpr]p3 and p4:
760 // The definition of a constexpr function(p3) or constructor(p4) [...] shall
762 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(),
763 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) {
764 switch ((*DclIt)->getKind()) {
765 case Decl::StaticAssert:
767 case Decl::UsingShadow:
768 case Decl::UsingDirective:
769 case Decl::UnresolvedUsingTypename:
770 // - static_assert-declarations
771 // - using-declarations,
772 // - using-directives,
776 case Decl::TypeAlias: {
777 // - typedef declarations and alias-declarations that do not define
778 // classes or enumerations,
779 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt);
780 if (TN->getUnderlyingType()->isVariablyModifiedType()) {
781 // Don't allow variably-modified types in constexpr functions.
782 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc();
783 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla)
784 << TL.getSourceRange() << TL.getType()
785 << isa<CXXConstructorDecl>(Dcl);
792 case Decl::CXXRecord:
793 // As an extension, we allow the declaration (but not the definition) of
794 // classes and enumerations in all declarations, not just in typedef and
795 // alias declarations.
796 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) {
797 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition)
798 << isa<CXXConstructorDecl>(Dcl);
804 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration)
805 << isa<CXXConstructorDecl>(Dcl);
809 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt)
810 << isa<CXXConstructorDecl>(Dcl);
818 /// Check that the given field is initialized within a constexpr constructor.
820 /// \param Dcl The constexpr constructor being checked.
821 /// \param Field The field being checked. This may be a member of an anonymous
822 /// struct or union nested within the class being checked.
823 /// \param Inits All declarations, including anonymous struct/union members and
824 /// indirect members, for which any initialization was provided.
825 /// \param Diagnosed Set to true if an error is produced.
826 static void CheckConstexprCtorInitializer(Sema &SemaRef,
827 const FunctionDecl *Dcl,
829 llvm::SmallSet<Decl*, 16> &Inits,
831 if (Field->isUnnamedBitfield())
834 if (Field->isAnonymousStructOrUnion() &&
835 Field->getType()->getAsCXXRecordDecl()->isEmpty())
838 if (!Inits.count(Field)) {
840 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init);
843 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init);
844 } else if (Field->isAnonymousStructOrUnion()) {
845 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl();
846 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end();
848 // If an anonymous union contains an anonymous struct of which any member
849 // is initialized, all members must be initialized.
850 if (!RD->isUnion() || Inits.count(*I))
851 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed);
855 /// Check the body for the given constexpr function declaration only contains
856 /// the permitted types of statement. C++11 [dcl.constexpr]p3,p4.
858 /// \return true if the body is OK, false if we have diagnosed a problem.
859 bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) {
860 if (isa<CXXTryStmt>(Body)) {
861 // C++11 [dcl.constexpr]p3:
862 // The definition of a constexpr function shall satisfy the following
863 // constraints: [...]
864 // - its function-body shall be = delete, = default, or a
865 // compound-statement
867 // C++11 [dcl.constexpr]p4:
868 // In the definition of a constexpr constructor, [...]
869 // - its function-body shall not be a function-try-block;
870 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block)
871 << isa<CXXConstructorDecl>(Dcl);
875 // - its function-body shall be [...] a compound-statement that contains only
876 CompoundStmt *CompBody = cast<CompoundStmt>(Body);
878 llvm::SmallVector<SourceLocation, 4> ReturnStmts;
879 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(),
880 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) {
881 switch ((*BodyIt)->getStmtClass()) {
882 case Stmt::NullStmtClass:
883 // - null statements,
886 case Stmt::DeclStmtClass:
887 // - static_assert-declarations
888 // - using-declarations,
889 // - using-directives,
890 // - typedef declarations and alias-declarations that do not define
891 // classes or enumerations,
892 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt)))
896 case Stmt::ReturnStmtClass:
897 // - and exactly one return statement;
898 if (isa<CXXConstructorDecl>(Dcl))
901 ReturnStmts.push_back((*BodyIt)->getLocStart());
908 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt)
909 << isa<CXXConstructorDecl>(Dcl);
913 if (const CXXConstructorDecl *Constructor
914 = dyn_cast<CXXConstructorDecl>(Dcl)) {
915 const CXXRecordDecl *RD = Constructor->getParent();
917 // - every non-variant non-static data member and base class sub-object
918 // shall be initialized;
919 // - if the class is a non-empty union, or for each non-empty anonymous
920 // union member of a non-union class, exactly one non-static data member
921 // shall be initialized;
923 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) {
924 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init);
927 } else if (!Constructor->isDependentContext() &&
928 !Constructor->isDelegatingConstructor()) {
929 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases");
931 // Skip detailed checking if we have enough initializers, and we would
932 // allow at most one initializer per member.
933 bool AnyAnonStructUnionMembers = false;
935 for (CXXRecordDecl::field_iterator I = RD->field_begin(),
936 E = RD->field_end(); I != E; ++I, ++Fields) {
937 if (I->isAnonymousStructOrUnion()) {
938 AnyAnonStructUnionMembers = true;
942 if (AnyAnonStructUnionMembers ||
943 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) {
944 // Check initialization of non-static data members. Base classes are
945 // always initialized so do not need to be checked. Dependent bases
946 // might not have initializers in the member initializer list.
947 llvm::SmallSet<Decl*, 16> Inits;
948 for (CXXConstructorDecl::init_const_iterator
949 I = Constructor->init_begin(), E = Constructor->init_end();
951 if (FieldDecl *FD = (*I)->getMember())
953 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember())
954 Inits.insert(ID->chain_begin(), ID->chain_end());
957 bool Diagnosed = false;
958 for (CXXRecordDecl::field_iterator I = RD->field_begin(),
959 E = RD->field_end(); I != E; ++I)
960 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed);
966 if (ReturnStmts.empty()) {
967 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return);
970 if (ReturnStmts.size() > 1) {
971 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return);
972 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I)
973 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return);
978 // C++11 [dcl.constexpr]p5:
979 // if no function argument values exist such that the function invocation
980 // substitution would produce a constant expression, the program is
981 // ill-formed; no diagnostic required.
982 // C++11 [dcl.constexpr]p3:
983 // - every constructor call and implicit conversion used in initializing the
984 // return value shall be one of those allowed in a constant expression.
985 // C++11 [dcl.constexpr]p4:
986 // - every constructor involved in initializing non-static data members and
987 // base class sub-objects shall be a constexpr constructor.
988 llvm::SmallVector<PartialDiagnosticAt, 8> Diags;
989 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) {
990 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr)
991 << isa<CXXConstructorDecl>(Dcl);
992 for (size_t I = 0, N = Diags.size(); I != N; ++I)
993 Diag(Diags[I].first, Diags[I].second);
1000 /// isCurrentClassName - Determine whether the identifier II is the
1001 /// name of the class type currently being defined. In the case of
1002 /// nested classes, this will only return true if II is the name of
1003 /// the innermost class.
1004 bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *,
1005 const CXXScopeSpec *SS) {
1006 assert(getLangOpts().CPlusPlus && "No class names in C!");
1008 CXXRecordDecl *CurDecl;
1009 if (SS && SS->isSet() && !SS->isInvalid()) {
1010 DeclContext *DC = computeDeclContext(*SS, true);
1011 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
1013 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
1015 if (CurDecl && CurDecl->getIdentifier())
1016 return &II == CurDecl->getIdentifier();
1021 /// \brief Determine whether the given class is a base class of the given
1022 /// class, including looking at dependent bases.
1023 static bool findCircularInheritance(const CXXRecordDecl *Class,
1024 const CXXRecordDecl *Current) {
1025 SmallVector<const CXXRecordDecl*, 8> Queue;
1027 Class = Class->getCanonicalDecl();
1029 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(),
1030 E = Current->bases_end();
1032 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl();
1036 Base = Base->getDefinition();
1040 if (Base->getCanonicalDecl() == Class)
1043 Queue.push_back(Base);
1049 Current = Queue.back();
1056 /// \brief Check the validity of a C++ base class specifier.
1058 /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics
1059 /// and returns NULL otherwise.
1061 Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
1062 SourceRange SpecifierRange,
1063 bool Virtual, AccessSpecifier Access,
1064 TypeSourceInfo *TInfo,
1065 SourceLocation EllipsisLoc) {
1066 QualType BaseType = TInfo->getType();
1068 // C++ [class.union]p1:
1069 // A union shall not have base classes.
1070 if (Class->isUnion()) {
1071 Diag(Class->getLocation(), diag::err_base_clause_on_union)
1076 if (EllipsisLoc.isValid() &&
1077 !TInfo->getType()->containsUnexpandedParameterPack()) {
1078 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
1079 << TInfo->getTypeLoc().getSourceRange();
1080 EllipsisLoc = SourceLocation();
1083 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc();
1085 if (BaseType->isDependentType()) {
1086 // Make sure that we don't have circular inheritance among our dependent
1087 // bases. For non-dependent bases, the check for completeness below handles
1089 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) {
1090 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() ||
1091 ((BaseDecl = BaseDecl->getDefinition()) &&
1092 findCircularInheritance(Class, BaseDecl))) {
1093 Diag(BaseLoc, diag::err_circular_inheritance)
1094 << BaseType << Context.getTypeDeclType(Class);
1096 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl())
1097 Diag(BaseDecl->getLocation(), diag::note_previous_decl)
1104 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
1105 Class->getTagKind() == TTK_Class,
1106 Access, TInfo, EllipsisLoc);
1109 // Base specifiers must be record types.
1110 if (!BaseType->isRecordType()) {
1111 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange;
1115 // C++ [class.union]p1:
1116 // A union shall not be used as a base class.
1117 if (BaseType->isUnionType()) {
1118 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange;
1122 // C++ [class.derived]p2:
1123 // The class-name in a base-specifier shall not be an incompletely
1125 if (RequireCompleteType(BaseLoc, BaseType,
1126 diag::err_incomplete_base_class, SpecifierRange)) {
1127 Class->setInvalidDecl();
1131 // If the base class is polymorphic or isn't empty, the new one is/isn't, too.
1132 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl();
1133 assert(BaseDecl && "Record type has no declaration");
1134 BaseDecl = BaseDecl->getDefinition();
1135 assert(BaseDecl && "Base type is not incomplete, but has no definition");
1136 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl);
1137 assert(CXXBaseDecl && "Base type is not a C++ type");
1140 // If a class is marked final and it appears as a base-type-specifier in
1141 // base-clause, the program is ill-formed.
1142 if (CXXBaseDecl->hasAttr<FinalAttr>()) {
1143 Diag(BaseLoc, diag::err_class_marked_final_used_as_base)
1144 << CXXBaseDecl->getDeclName();
1145 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl)
1146 << CXXBaseDecl->getDeclName();
1150 if (BaseDecl->isInvalidDecl())
1151 Class->setInvalidDecl();
1153 // Create the base specifier.
1154 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
1155 Class->getTagKind() == TTK_Class,
1156 Access, TInfo, EllipsisLoc);
1159 /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
1160 /// one entry in the base class list of a class specifier, for
1162 /// class foo : public bar, virtual private baz {
1163 /// 'public bar' and 'virtual private baz' are each base-specifiers.
1165 Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange,
1166 bool Virtual, AccessSpecifier Access,
1167 ParsedType basetype, SourceLocation BaseLoc,
1168 SourceLocation EllipsisLoc) {
1172 AdjustDeclIfTemplate(classdecl);
1173 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl);
1177 TypeSourceInfo *TInfo = 0;
1178 GetTypeFromParser(basetype, &TInfo);
1180 if (EllipsisLoc.isInvalid() &&
1181 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo,
1185 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange,
1186 Virtual, Access, TInfo,
1190 Class->setInvalidDecl();
1195 /// \brief Performs the actual work of attaching the given base class
1196 /// specifiers to a C++ class.
1197 bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases,
1198 unsigned NumBases) {
1202 // Used to keep track of which base types we have already seen, so
1203 // that we can properly diagnose redundant direct base types. Note
1204 // that the key is always the unqualified canonical type of the base
1206 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes;
1208 // Copy non-redundant base specifiers into permanent storage.
1209 unsigned NumGoodBases = 0;
1210 bool Invalid = false;
1211 for (unsigned idx = 0; idx < NumBases; ++idx) {
1212 QualType NewBaseType
1213 = Context.getCanonicalType(Bases[idx]->getType());
1214 NewBaseType = NewBaseType.getLocalUnqualifiedType();
1216 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType];
1218 // C++ [class.mi]p3:
1219 // A class shall not be specified as a direct base class of a
1220 // derived class more than once.
1221 Diag(Bases[idx]->getLocStart(),
1222 diag::err_duplicate_base_class)
1223 << KnownBase->getType()
1224 << Bases[idx]->getSourceRange();
1226 // Delete the duplicate base class specifier; we're going to
1227 // overwrite its pointer later.
1228 Context.Deallocate(Bases[idx]);
1232 // Okay, add this new base class.
1233 KnownBase = Bases[idx];
1234 Bases[NumGoodBases++] = Bases[idx];
1235 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) {
1236 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
1237 if (Class->isInterface() &&
1238 (!RD->isInterface() ||
1239 KnownBase->getAccessSpecifier() != AS_public)) {
1240 // The Microsoft extension __interface does not permit bases that
1241 // are not themselves public interfaces.
1242 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface)
1243 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName()
1244 << RD->getSourceRange();
1247 if (RD->hasAttr<WeakAttr>())
1248 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context));
1253 // Attach the remaining base class specifiers to the derived class.
1254 Class->setBases(Bases, NumGoodBases);
1256 // Delete the remaining (good) base class specifiers, since their
1257 // data has been copied into the CXXRecordDecl.
1258 for (unsigned idx = 0; idx < NumGoodBases; ++idx)
1259 Context.Deallocate(Bases[idx]);
1264 /// ActOnBaseSpecifiers - Attach the given base specifiers to the
1265 /// class, after checking whether there are any duplicate base
1267 void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases,
1268 unsigned NumBases) {
1269 if (!ClassDecl || !Bases || !NumBases)
1272 AdjustDeclIfTemplate(ClassDecl);
1273 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl),
1274 (CXXBaseSpecifier**)(Bases), NumBases);
1277 static CXXRecordDecl *GetClassForType(QualType T) {
1278 if (const RecordType *RT = T->getAs<RecordType>())
1279 return cast<CXXRecordDecl>(RT->getDecl());
1280 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>())
1281 return ICT->getDecl();
1286 /// \brief Determine whether the type \p Derived is a C++ class that is
1287 /// derived from the type \p Base.
1288 bool Sema::IsDerivedFrom(QualType Derived, QualType Base) {
1289 if (!getLangOpts().CPlusPlus)
1292 CXXRecordDecl *DerivedRD = GetClassForType(Derived);
1296 CXXRecordDecl *BaseRD = GetClassForType(Base);
1300 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this.
1301 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD);
1304 /// \brief Determine whether the type \p Derived is a C++ class that is
1305 /// derived from the type \p Base.
1306 bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) {
1307 if (!getLangOpts().CPlusPlus)
1310 CXXRecordDecl *DerivedRD = GetClassForType(Derived);
1314 CXXRecordDecl *BaseRD = GetClassForType(Base);
1318 return DerivedRD->isDerivedFrom(BaseRD, Paths);
1321 void Sema::BuildBasePathArray(const CXXBasePaths &Paths,
1322 CXXCastPath &BasePathArray) {
1323 assert(BasePathArray.empty() && "Base path array must be empty!");
1324 assert(Paths.isRecordingPaths() && "Must record paths!");
1326 const CXXBasePath &Path = Paths.front();
1328 // We first go backward and check if we have a virtual base.
1329 // FIXME: It would be better if CXXBasePath had the base specifier for
1330 // the nearest virtual base.
1332 for (unsigned I = Path.size(); I != 0; --I) {
1333 if (Path[I - 1].Base->isVirtual()) {
1339 // Now add all bases.
1340 for (unsigned I = Start, E = Path.size(); I != E; ++I)
1341 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base));
1344 /// \brief Determine whether the given base path includes a virtual
1346 bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) {
1347 for (CXXCastPath::const_iterator B = BasePath.begin(),
1348 BEnd = BasePath.end();
1350 if ((*B)->isVirtual())
1356 /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base
1357 /// conversion (where Derived and Base are class types) is
1358 /// well-formed, meaning that the conversion is unambiguous (and
1359 /// that all of the base classes are accessible). Returns true
1360 /// and emits a diagnostic if the code is ill-formed, returns false
1361 /// otherwise. Loc is the location where this routine should point to
1362 /// if there is an error, and Range is the source range to highlight
1363 /// if there is an error.
1365 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
1366 unsigned InaccessibleBaseID,
1367 unsigned AmbigiousBaseConvID,
1368 SourceLocation Loc, SourceRange Range,
1369 DeclarationName Name,
1370 CXXCastPath *BasePath) {
1371 // First, determine whether the path from Derived to Base is
1372 // ambiguous. This is slightly more expensive than checking whether
1373 // the Derived to Base conversion exists, because here we need to
1374 // explore multiple paths to determine if there is an ambiguity.
1375 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1376 /*DetectVirtual=*/false);
1377 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths);
1378 assert(DerivationOkay &&
1379 "Can only be used with a derived-to-base conversion");
1380 (void)DerivationOkay;
1382 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) {
1383 if (InaccessibleBaseID) {
1384 // Check that the base class can be accessed.
1385 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(),
1386 InaccessibleBaseID)) {
1387 case AR_inaccessible:
1396 // Build a base path if necessary.
1398 BuildBasePathArray(Paths, *BasePath);
1402 // We know that the derived-to-base conversion is ambiguous, and
1403 // we're going to produce a diagnostic. Perform the derived-to-base
1404 // search just one more time to compute all of the possible paths so
1405 // that we can print them out. This is more expensive than any of
1406 // the previous derived-to-base checks we've done, but at this point
1407 // performance isn't as much of an issue.
1409 Paths.setRecordingPaths(true);
1410 bool StillOkay = IsDerivedFrom(Derived, Base, Paths);
1411 assert(StillOkay && "Can only be used with a derived-to-base conversion");
1414 // Build up a textual representation of the ambiguous paths, e.g.,
1415 // D -> B -> A, that will be used to illustrate the ambiguous
1416 // conversions in the diagnostic. We only print one of the paths
1417 // to each base class subobject.
1418 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths);
1420 Diag(Loc, AmbigiousBaseConvID)
1421 << Derived << Base << PathDisplayStr << Range << Name;
1426 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
1427 SourceLocation Loc, SourceRange Range,
1428 CXXCastPath *BasePath,
1429 bool IgnoreAccess) {
1430 return CheckDerivedToBaseConversion(Derived, Base,
1432 : diag::err_upcast_to_inaccessible_base,
1433 diag::err_ambiguous_derived_to_base_conv,
1434 Loc, Range, DeclarationName(),
1439 /// @brief Builds a string representing ambiguous paths from a
1440 /// specific derived class to different subobjects of the same base
1443 /// This function builds a string that can be used in error messages
1444 /// to show the different paths that one can take through the
1445 /// inheritance hierarchy to go from the derived class to different
1446 /// subobjects of a base class. The result looks something like this:
1448 /// struct D -> struct B -> struct A
1449 /// struct D -> struct C -> struct A
1451 std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) {
1452 std::string PathDisplayStr;
1453 std::set<unsigned> DisplayedPaths;
1454 for (CXXBasePaths::paths_iterator Path = Paths.begin();
1455 Path != Paths.end(); ++Path) {
1456 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) {
1457 // We haven't displayed a path to this particular base
1458 // class subobject yet.
1459 PathDisplayStr += "\n ";
1460 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString();
1461 for (CXXBasePath::const_iterator Element = Path->begin();
1462 Element != Path->end(); ++Element)
1463 PathDisplayStr += " -> " + Element->Base->getType().getAsString();
1467 return PathDisplayStr;
1470 //===----------------------------------------------------------------------===//
1471 // C++ class member Handling
1472 //===----------------------------------------------------------------------===//
1474 /// ActOnAccessSpecifier - Parsed an access specifier followed by a colon.
1475 bool Sema::ActOnAccessSpecifier(AccessSpecifier Access,
1476 SourceLocation ASLoc,
1477 SourceLocation ColonLoc,
1478 AttributeList *Attrs) {
1479 assert(Access != AS_none && "Invalid kind for syntactic access specifier!");
1480 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext,
1482 CurContext->addHiddenDecl(ASDecl);
1483 return ProcessAccessDeclAttributeList(ASDecl, Attrs);
1486 /// CheckOverrideControl - Check C++11 override control semantics.
1487 void Sema::CheckOverrideControl(Decl *D) {
1488 if (D->isInvalidDecl())
1491 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D);
1493 // Do we know which functions this declaration might be overriding?
1494 bool OverridesAreKnown = !MD ||
1495 (!MD->getParent()->hasAnyDependentBases() &&
1496 !MD->getType()->isDependentType());
1498 if (!MD || !MD->isVirtual()) {
1499 if (OverridesAreKnown) {
1500 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) {
1501 Diag(OA->getLocation(),
1502 diag::override_keyword_only_allowed_on_virtual_member_functions)
1503 << "override" << FixItHint::CreateRemoval(OA->getLocation());
1504 D->dropAttr<OverrideAttr>();
1506 if (FinalAttr *FA = D->getAttr<FinalAttr>()) {
1507 Diag(FA->getLocation(),
1508 diag::override_keyword_only_allowed_on_virtual_member_functions)
1509 << "final" << FixItHint::CreateRemoval(FA->getLocation());
1510 D->dropAttr<FinalAttr>();
1516 if (!OverridesAreKnown)
1519 // C++11 [class.virtual]p5:
1520 // If a virtual function is marked with the virt-specifier override and
1521 // does not override a member function of a base class, the program is
1523 bool HasOverriddenMethods =
1524 MD->begin_overridden_methods() != MD->end_overridden_methods();
1525 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods)
1526 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding)
1527 << MD->getDeclName();
1530 /// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member
1531 /// function overrides a virtual member function marked 'final', according to
1532 /// C++11 [class.virtual]p4.
1533 bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New,
1534 const CXXMethodDecl *Old) {
1535 if (!Old->hasAttr<FinalAttr>())
1538 Diag(New->getLocation(), diag::err_final_function_overridden)
1539 << New->getDeclName();
1540 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
1544 static bool InitializationHasSideEffects(const FieldDecl &FD) {
1545 const Type *T = FD.getType()->getBaseElementTypeUnsafe();
1546 // FIXME: Destruction of ObjC lifetime types has side-effects.
1547 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
1548 return !RD->isCompleteDefinition() ||
1549 !RD->hasTrivialDefaultConstructor() ||
1550 !RD->hasTrivialDestructor();
1554 /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member
1555 /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the
1556 /// bitfield width if there is one, 'InitExpr' specifies the initializer if
1557 /// one has been parsed, and 'InitStyle' is set if an in-class initializer is
1558 /// present (but parsing it has been deferred).
1560 Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
1561 MultiTemplateParamsArg TemplateParameterLists,
1562 Expr *BW, const VirtSpecifiers &VS,
1563 InClassInitStyle InitStyle) {
1564 const DeclSpec &DS = D.getDeclSpec();
1565 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
1566 DeclarationName Name = NameInfo.getName();
1567 SourceLocation Loc = NameInfo.getLoc();
1569 // For anonymous bitfields, the location should point to the type.
1570 if (Loc.isInvalid())
1571 Loc = D.getLocStart();
1573 Expr *BitWidth = static_cast<Expr*>(BW);
1575 assert(isa<CXXRecordDecl>(CurContext));
1576 assert(!DS.isFriendSpecified());
1578 bool isFunc = D.isDeclarationOfFunction();
1580 if (cast<CXXRecordDecl>(CurContext)->isInterface()) {
1581 // The Microsoft extension __interface only permits public member functions
1582 // and prohibits constructors, destructors, operators, non-public member
1583 // functions, static methods and data members.
1584 unsigned InvalidDecl;
1585 bool ShowDeclName = true;
1587 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1;
1588 else if (AS != AS_public)
1590 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static)
1592 else switch (Name.getNameKind()) {
1593 case DeclarationName::CXXConstructorName:
1595 ShowDeclName = false;
1598 case DeclarationName::CXXDestructorName:
1600 ShowDeclName = false;
1603 case DeclarationName::CXXOperatorName:
1604 case DeclarationName::CXXConversionFunctionName:
1615 Diag(Loc, diag::err_invalid_member_in_interface)
1616 << (InvalidDecl-1) << Name;
1618 Diag(Loc, diag::err_invalid_member_in_interface)
1619 << (InvalidDecl-1) << "";
1624 // C++ 9.2p6: A member shall not be declared to have automatic storage
1625 // duration (auto, register) or with the extern storage-class-specifier.
1626 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class
1627 // data members and cannot be applied to names declared const or static,
1628 // and cannot be applied to reference members.
1629 switch (DS.getStorageClassSpec()) {
1630 case DeclSpec::SCS_unspecified:
1631 case DeclSpec::SCS_typedef:
1632 case DeclSpec::SCS_static:
1635 case DeclSpec::SCS_mutable:
1637 if (DS.getStorageClassSpecLoc().isValid())
1638 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function);
1640 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function);
1642 // FIXME: It would be nicer if the keyword was ignored only for this
1643 // declarator. Otherwise we could get follow-up errors.
1644 D.getMutableDeclSpec().ClearStorageClassSpecs();
1648 if (DS.getStorageClassSpecLoc().isValid())
1649 Diag(DS.getStorageClassSpecLoc(),
1650 diag::err_storageclass_invalid_for_member);
1652 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member);
1653 D.getMutableDeclSpec().ClearStorageClassSpecs();
1656 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
1657 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
1662 CXXScopeSpec &SS = D.getCXXScopeSpec();
1664 // Data members must have identifiers for names.
1665 if (!Name.isIdentifier()) {
1666 Diag(Loc, diag::err_bad_variable_name)
1671 IdentifierInfo *II = Name.getAsIdentifierInfo();
1673 // Member field could not be with "template" keyword.
1674 // So TemplateParameterLists should be empty in this case.
1675 if (TemplateParameterLists.size()) {
1676 TemplateParameterList* TemplateParams = TemplateParameterLists[0];
1677 if (TemplateParams->size()) {
1678 // There is no such thing as a member field template.
1679 Diag(D.getIdentifierLoc(), diag::err_template_member)
1681 << SourceRange(TemplateParams->getTemplateLoc(),
1682 TemplateParams->getRAngleLoc());
1684 // There is an extraneous 'template<>' for this member.
1685 Diag(TemplateParams->getTemplateLoc(),
1686 diag::err_template_member_noparams)
1688 << SourceRange(TemplateParams->getTemplateLoc(),
1689 TemplateParams->getRAngleLoc());
1694 if (SS.isSet() && !SS.isInvalid()) {
1695 // The user provided a superfluous scope specifier inside a class
1701 if (DeclContext *DC = computeDeclContext(SS, false))
1702 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc());
1704 Diag(D.getIdentifierLoc(), diag::err_member_qualification)
1705 << Name << SS.getRange();
1710 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth,
1712 assert(Member && "HandleField never returns null");
1714 assert(InitStyle == ICIS_NoInit);
1716 Member = HandleDeclarator(S, D, TemplateParameterLists);
1721 // Non-instance-fields can't have a bitfield.
1723 if (Member->isInvalidDecl()) {
1724 // don't emit another diagnostic.
1725 } else if (isa<VarDecl>(Member)) {
1726 // C++ 9.6p3: A bit-field shall not be a static member.
1727 // "static member 'A' cannot be a bit-field"
1728 Diag(Loc, diag::err_static_not_bitfield)
1729 << Name << BitWidth->getSourceRange();
1730 } else if (isa<TypedefDecl>(Member)) {
1731 // "typedef member 'x' cannot be a bit-field"
1732 Diag(Loc, diag::err_typedef_not_bitfield)
1733 << Name << BitWidth->getSourceRange();
1735 // A function typedef ("typedef int f(); f a;").
1736 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
1737 Diag(Loc, diag::err_not_integral_type_bitfield)
1738 << Name << cast<ValueDecl>(Member)->getType()
1739 << BitWidth->getSourceRange();
1743 Member->setInvalidDecl();
1746 Member->setAccess(AS);
1748 // If we have declared a member function template, set the access of the
1749 // templated declaration as well.
1750 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member))
1751 FunTmpl->getTemplatedDecl()->setAccess(AS);
1754 if (VS.isOverrideSpecified())
1755 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context));
1756 if (VS.isFinalSpecified())
1757 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context));
1759 if (VS.getLastLocation().isValid()) {
1760 // Update the end location of a method that has a virt-specifiers.
1761 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member))
1762 MD->setRangeEnd(VS.getLastLocation());
1765 CheckOverrideControl(Member);
1767 assert((Name || isInstField) && "No identifier for non-field ?");
1770 FieldDecl *FD = cast<FieldDecl>(Member);
1771 FieldCollector->Add(FD);
1773 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field,
1775 != DiagnosticsEngine::Ignored) {
1776 // Remember all explicit private FieldDecls that have a name, no side
1777 // effects and are not part of a dependent type declaration.
1778 if (!FD->isImplicit() && FD->getDeclName() &&
1779 FD->getAccess() == AS_private &&
1780 !FD->hasAttr<UnusedAttr>() &&
1781 !FD->getParent()->isDependentContext() &&
1782 !InitializationHasSideEffects(*FD))
1783 UnusedPrivateFields.insert(FD);
1791 class UninitializedFieldVisitor
1792 : public EvaluatedExprVisitor<UninitializedFieldVisitor> {
1796 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited;
1797 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context),
1801 void HandleExpr(Expr *E) {
1804 // Expressions like x(x) sometimes lack the surrounding expressions
1805 // but need to be checked anyways.
1810 void HandleValue(Expr *E) {
1811 E = E->IgnoreParens();
1813 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
1814 if (isa<EnumConstantDecl>(ME->getMemberDecl()))
1817 while (isa<MemberExpr>(Base)) {
1818 ME = dyn_cast<MemberExpr>(Base);
1819 if (VarDecl *VarD = dyn_cast<VarDecl>(ME->getMemberDecl()))
1820 if (VarD->hasGlobalStorage())
1822 Base = ME->getBase();
1825 if (VD == ME->getMemberDecl() && isa<CXXThisExpr>(Base)) {
1826 unsigned diag = VD->getType()->isReferenceType()
1827 ? diag::warn_reference_field_is_uninit
1828 : diag::warn_field_is_uninit;
1829 S.Diag(ME->getExprLoc(), diag) << ME->getMemberNameInfo().getName();
1834 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
1835 HandleValue(CO->getTrueExpr());
1836 HandleValue(CO->getFalseExpr());
1840 if (BinaryConditionalOperator *BCO =
1841 dyn_cast<BinaryConditionalOperator>(E)) {
1842 HandleValue(BCO->getCommon());
1843 HandleValue(BCO->getFalseExpr());
1847 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
1848 switch (BO->getOpcode()) {
1853 HandleValue(BO->getLHS());
1856 HandleValue(BO->getRHS());
1862 void VisitImplicitCastExpr(ImplicitCastExpr *E) {
1863 if (E->getCastKind() == CK_LValueToRValue)
1864 HandleValue(E->getSubExpr());
1866 Inherited::VisitImplicitCastExpr(E);
1869 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
1870 Expr *Callee = E->getCallee();
1871 if (isa<MemberExpr>(Callee))
1872 HandleValue(Callee);
1874 Inherited::VisitCXXMemberCallExpr(E);
1877 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E,
1879 UninitializedFieldVisitor(S, VD).HandleExpr(E);
1883 /// ActOnCXXInClassMemberInitializer - This is invoked after parsing an
1884 /// in-class initializer for a non-static C++ class member, and after
1885 /// instantiating an in-class initializer in a class template. Such actions
1886 /// are deferred until the class is complete.
1888 Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc,
1890 FieldDecl *FD = cast<FieldDecl>(D);
1891 assert(FD->getInClassInitStyle() != ICIS_NoInit &&
1892 "must set init style when field is created");
1895 FD->setInvalidDecl();
1896 FD->removeInClassInitializer();
1900 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) {
1901 FD->setInvalidDecl();
1902 FD->removeInClassInitializer();
1906 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc)
1907 != DiagnosticsEngine::Ignored) {
1908 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD);
1911 ExprResult Init = InitExpr;
1912 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent() &&
1913 !FD->getDeclContext()->isDependentContext()) {
1914 // Note: We don't type-check when we're in a dependent context, because
1915 // the initialization-substitution code does not properly handle direct
1916 // list initialization. We have the same hackaround for ctor-initializers.
1917 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) {
1918 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list)
1919 << /*at end of ctor*/1 << InitExpr->getSourceRange();
1921 Expr **Inits = &InitExpr;
1922 unsigned NumInits = 1;
1923 InitializedEntity Entity = InitializedEntity::InitializeMember(FD);
1924 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit
1925 ? InitializationKind::CreateDirectList(InitExpr->getLocStart())
1926 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc);
1927 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits);
1928 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits));
1929 if (Init.isInvalid()) {
1930 FD->setInvalidDecl();
1934 CheckImplicitConversions(Init.get(), InitLoc);
1937 // C++0x [class.base.init]p7:
1938 // The initialization of each base and member constitutes a
1940 Init = MaybeCreateExprWithCleanups(Init);
1941 if (Init.isInvalid()) {
1942 FD->setInvalidDecl();
1946 InitExpr = Init.release();
1948 FD->setInClassInitializer(InitExpr);
1951 /// \brief Find the direct and/or virtual base specifiers that
1952 /// correspond to the given base type, for use in base initialization
1953 /// within a constructor.
1954 static bool FindBaseInitializer(Sema &SemaRef,
1955 CXXRecordDecl *ClassDecl,
1957 const CXXBaseSpecifier *&DirectBaseSpec,
1958 const CXXBaseSpecifier *&VirtualBaseSpec) {
1959 // First, check for a direct base class.
1961 for (CXXRecordDecl::base_class_const_iterator Base
1962 = ClassDecl->bases_begin();
1963 Base != ClassDecl->bases_end(); ++Base) {
1964 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) {
1965 // We found a direct base of this type. That's what we're
1967 DirectBaseSpec = &*Base;
1972 // Check for a virtual base class.
1973 // FIXME: We might be able to short-circuit this if we know in advance that
1974 // there are no virtual bases.
1975 VirtualBaseSpec = 0;
1976 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) {
1977 // We haven't found a base yet; search the class hierarchy for a
1978 // virtual base class.
1979 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1980 /*DetectVirtual=*/false);
1981 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl),
1983 for (CXXBasePaths::paths_iterator Path = Paths.begin();
1984 Path != Paths.end(); ++Path) {
1985 if (Path->back().Base->isVirtual()) {
1986 VirtualBaseSpec = Path->back().Base;
1993 return DirectBaseSpec || VirtualBaseSpec;
1996 /// \brief Handle a C++ member initializer using braced-init-list syntax.
1998 Sema::ActOnMemInitializer(Decl *ConstructorD,
2001 IdentifierInfo *MemberOrBase,
2002 ParsedType TemplateTypeTy,
2004 SourceLocation IdLoc,
2006 SourceLocation EllipsisLoc) {
2007 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
2008 DS, IdLoc, InitList,
2012 /// \brief Handle a C++ member initializer using parentheses syntax.
2014 Sema::ActOnMemInitializer(Decl *ConstructorD,
2017 IdentifierInfo *MemberOrBase,
2018 ParsedType TemplateTypeTy,
2020 SourceLocation IdLoc,
2021 SourceLocation LParenLoc,
2022 Expr **Args, unsigned NumArgs,
2023 SourceLocation RParenLoc,
2024 SourceLocation EllipsisLoc) {
2025 Expr *List = new (Context) ParenListExpr(Context, LParenLoc,
2026 llvm::makeArrayRef(Args, NumArgs),
2028 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
2029 DS, IdLoc, List, EllipsisLoc);
2034 // Callback to only accept typo corrections that can be a valid C++ member
2035 // intializer: either a non-static field member or a base class.
2036 class MemInitializerValidatorCCC : public CorrectionCandidateCallback {
2038 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl)
2039 : ClassDecl(ClassDecl) {}
2041 virtual bool ValidateCandidate(const TypoCorrection &candidate) {
2042 if (NamedDecl *ND = candidate.getCorrectionDecl()) {
2043 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND))
2044 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl);
2046 return isa<TypeDecl>(ND);
2052 CXXRecordDecl *ClassDecl;
2057 /// \brief Handle a C++ member initializer.
2059 Sema::BuildMemInitializer(Decl *ConstructorD,
2062 IdentifierInfo *MemberOrBase,
2063 ParsedType TemplateTypeTy,
2065 SourceLocation IdLoc,
2067 SourceLocation EllipsisLoc) {
2071 AdjustDeclIfTemplate(ConstructorD);
2073 CXXConstructorDecl *Constructor
2074 = dyn_cast<CXXConstructorDecl>(ConstructorD);
2076 // The user wrote a constructor initializer on a function that is
2077 // not a C++ constructor. Ignore the error for now, because we may
2078 // have more member initializers coming; we'll diagnose it just
2079 // once in ActOnMemInitializers.
2083 CXXRecordDecl *ClassDecl = Constructor->getParent();
2085 // C++ [class.base.init]p2:
2086 // Names in a mem-initializer-id are looked up in the scope of the
2087 // constructor's class and, if not found in that scope, are looked
2088 // up in the scope containing the constructor's definition.
2089 // [Note: if the constructor's class contains a member with the
2090 // same name as a direct or virtual base class of the class, a
2091 // mem-initializer-id naming the member or base class and composed
2092 // of a single identifier refers to the class member. A
2093 // mem-initializer-id for the hidden base class may be specified
2094 // using a qualified name. ]
2095 if (!SS.getScopeRep() && !TemplateTypeTy) {
2096 // Look for a member, first.
2097 DeclContext::lookup_result Result
2098 = ClassDecl->lookup(MemberOrBase);
2099 if (Result.first != Result.second) {
2101 if ((Member = dyn_cast<FieldDecl>(*Result.first)) ||
2102 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) {
2103 if (EllipsisLoc.isValid())
2104 Diag(EllipsisLoc, diag::err_pack_expansion_member_init)
2106 << SourceRange(IdLoc, Init->getSourceRange().getEnd());
2108 return BuildMemberInitializer(Member, Init, IdLoc);
2112 // It didn't name a member, so see if it names a class.
2114 TypeSourceInfo *TInfo = 0;
2116 if (TemplateTypeTy) {
2117 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo);
2118 } else if (DS.getTypeSpecType() == TST_decltype) {
2119 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc());
2121 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName);
2122 LookupParsedName(R, S, &SS);
2124 TypeDecl *TyD = R.getAsSingle<TypeDecl>();
2126 if (R.isAmbiguous()) return true;
2128 // We don't want access-control diagnostics here.
2129 R.suppressDiagnostics();
2131 if (SS.isSet() && isDependentScopeSpecifier(SS)) {
2132 bool NotUnknownSpecialization = false;
2133 DeclContext *DC = computeDeclContext(SS, false);
2134 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC))
2135 NotUnknownSpecialization = !Record->hasAnyDependentBases();
2137 if (!NotUnknownSpecialization) {
2138 // When the scope specifier can refer to a member of an unknown
2139 // specialization, we take it as a type name.
2140 BaseType = CheckTypenameType(ETK_None, SourceLocation(),
2141 SS.getWithLocInContext(Context),
2142 *MemberOrBase, IdLoc);
2143 if (BaseType.isNull())
2147 R.setLookupName(MemberOrBase);
2151 // If no results were found, try to correct typos.
2152 TypoCorrection Corr;
2153 MemInitializerValidatorCCC Validator(ClassDecl);
2154 if (R.empty() && BaseType.isNull() &&
2155 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS,
2156 Validator, ClassDecl))) {
2157 std::string CorrectedStr(Corr.getAsString(getLangOpts()));
2158 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts()));
2159 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) {
2160 // We have found a non-static data member with a similar
2161 // name to what was typed; complain and initialize that
2163 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest)
2164 << MemberOrBase << true << CorrectedQuotedStr
2165 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr);
2166 Diag(Member->getLocation(), diag::note_previous_decl)
2167 << CorrectedQuotedStr;
2169 return BuildMemberInitializer(Member, Init, IdLoc);
2170 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) {
2171 const CXXBaseSpecifier *DirectBaseSpec;
2172 const CXXBaseSpecifier *VirtualBaseSpec;
2173 if (FindBaseInitializer(*this, ClassDecl,
2174 Context.getTypeDeclType(Type),
2175 DirectBaseSpec, VirtualBaseSpec)) {
2176 // We have found a direct or virtual base class with a
2177 // similar name to what was typed; complain and initialize
2179 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest)
2180 << MemberOrBase << false << CorrectedQuotedStr
2181 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr);
2183 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec
2185 Diag(BaseSpec->getLocStart(),
2186 diag::note_base_class_specified_here)
2187 << BaseSpec->getType()
2188 << BaseSpec->getSourceRange();
2195 if (!TyD && BaseType.isNull()) {
2196 Diag(IdLoc, diag::err_mem_init_not_member_or_class)
2197 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd());
2202 if (BaseType.isNull()) {
2203 BaseType = Context.getTypeDeclType(TyD);
2205 NestedNameSpecifier *Qualifier =
2206 static_cast<NestedNameSpecifier*>(SS.getScopeRep());
2208 // FIXME: preserve source range information
2209 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType);
2215 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc);
2217 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc);
2220 /// Checks a member initializer expression for cases where reference (or
2221 /// pointer) members are bound to by-value parameters (or their addresses).
2222 static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member,
2224 SourceLocation IdLoc) {
2225 QualType MemberTy = Member->getType();
2227 // We only handle pointers and references currently.
2228 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers?
2229 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType())
2232 const bool IsPointer = MemberTy->isPointerType();
2234 if (const UnaryOperator *Op
2235 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) {
2236 // The only case we're worried about with pointers requires taking the
2238 if (Op->getOpcode() != UO_AddrOf)
2241 Init = Op->getSubExpr();
2243 // We only handle address-of expression initializers for pointers.
2248 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) {
2249 // Taking the address of a temporary will be diagnosed as a hard error.
2253 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary)
2254 << Member << Init->getSourceRange();
2255 } else if (const DeclRefExpr *DRE
2256 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) {
2257 // We only warn when referring to a non-reference parameter declaration.
2258 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl());
2259 if (!Parameter || Parameter->getType()->isReferenceType())
2262 S.Diag(Init->getExprLoc(),
2263 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr
2264 : diag::warn_bind_ref_member_to_parameter)
2265 << Member << Parameter << Init->getSourceRange();
2267 // Other initializers are fine.
2271 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here)
2272 << (unsigned)IsPointer;
2276 Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init,
2277 SourceLocation IdLoc) {
2278 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member);
2279 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member);
2280 assert((DirectMember || IndirectMember) &&
2281 "Member must be a FieldDecl or IndirectFieldDecl");
2283 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
2286 if (Member->isInvalidDecl())
2289 // Diagnose value-uses of fields to initialize themselves, e.g.
2291 // where foo is not also a parameter to the constructor.
2292 // TODO: implement -Wuninitialized and fold this into that framework.
2295 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
2296 Args = ParenList->getExprs();
2297 NumArgs = ParenList->getNumExprs();
2299 InitListExpr *InitList = cast<InitListExpr>(Init);
2300 Args = InitList->getInits();
2301 NumArgs = InitList->getNumInits();
2304 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc)
2305 != DiagnosticsEngine::Ignored)
2306 for (unsigned i = 0; i < NumArgs; ++i)
2307 // FIXME: Warn about the case when other fields are used before being
2308 // initialized. For example, let this field be the i'th field. When
2309 // initializing the i'th field, throw a warning if any of the >= i'th
2310 // fields are used, as they are not yet initialized.
2311 // Right now we are only handling the case where the i'th field uses
2312 // itself in its initializer.
2313 // Also need to take into account that some fields may be initialized by
2314 // in-class initializers, see C++11 [class.base.init]p9.
2315 CheckInitExprContainsUninitializedFields(*this, Args[i], Member);
2317 SourceRange InitRange = Init->getSourceRange();
2319 if (Member->getType()->isDependentType() || Init->isTypeDependent()) {
2320 // Can't check initialization for a member of dependent type or when
2321 // any of the arguments are type-dependent expressions.
2322 DiscardCleanupsInEvaluationContext();
2324 bool InitList = false;
2325 if (isa<InitListExpr>(Init)) {
2330 if (isStdInitializerList(Member->getType(), 0)) {
2331 Diag(IdLoc, diag::warn_dangling_std_initializer_list)
2332 << /*at end of ctor*/1 << InitRange;
2336 // Initialize the member.
2337 InitializedEntity MemberEntity =
2338 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0)
2339 : InitializedEntity::InitializeMember(IndirectMember, 0);
2340 InitializationKind Kind =
2341 InitList ? InitializationKind::CreateDirectList(IdLoc)
2342 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(),
2343 InitRange.getEnd());
2345 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs);
2346 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind,
2347 MultiExprArg(Args, NumArgs),
2349 if (MemberInit.isInvalid())
2352 CheckImplicitConversions(MemberInit.get(),
2353 InitRange.getBegin());
2355 // C++0x [class.base.init]p7:
2356 // The initialization of each base and member constitutes a
2358 MemberInit = MaybeCreateExprWithCleanups(MemberInit);
2359 if (MemberInit.isInvalid())
2362 // If we are in a dependent context, template instantiation will
2363 // perform this type-checking again. Just save the arguments that we
2365 // FIXME: This isn't quite ideal, since our ASTs don't capture all
2366 // of the information that we have about the member
2367 // initializer. However, deconstructing the ASTs is a dicey process,
2368 // and this approach is far more likely to get the corner cases right.
2369 if (CurContext->isDependentContext()) {
2370 // The existing Init will do fine.
2372 Init = MemberInit.get();
2373 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc);
2378 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc,
2379 InitRange.getBegin(), Init,
2380 InitRange.getEnd());
2382 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc,
2383 InitRange.getBegin(), Init,
2384 InitRange.getEnd());
2389 Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init,
2390 CXXRecordDecl *ClassDecl) {
2391 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin();
2392 if (!LangOpts.CPlusPlus0x)
2393 return Diag(NameLoc, diag::err_delegating_ctor)
2394 << TInfo->getTypeLoc().getLocalSourceRange();
2395 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor);
2397 bool InitList = true;
2398 Expr **Args = &Init;
2399 unsigned NumArgs = 1;
2400 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
2402 Args = ParenList->getExprs();
2403 NumArgs = ParenList->getNumExprs();
2406 SourceRange InitRange = Init->getSourceRange();
2407 // Initialize the object.
2408 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation(
2409 QualType(ClassDecl->getTypeForDecl(), 0));
2410 InitializationKind Kind =
2411 InitList ? InitializationKind::CreateDirectList(NameLoc)
2412 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(),
2413 InitRange.getEnd());
2414 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs);
2415 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind,
2416 MultiExprArg(Args, NumArgs),
2418 if (DelegationInit.isInvalid())
2421 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() &&
2422 "Delegating constructor with no target?");
2424 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin());
2426 // C++0x [class.base.init]p7:
2427 // The initialization of each base and member constitutes a
2429 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit);
2430 if (DelegationInit.isInvalid())
2433 // If we are in a dependent context, template instantiation will
2434 // perform this type-checking again. Just save the arguments that we
2435 // received in a ParenListExpr.
2436 // FIXME: This isn't quite ideal, since our ASTs don't capture all
2437 // of the information that we have about the base
2438 // initializer. However, deconstructing the ASTs is a dicey process,
2439 // and this approach is far more likely to get the corner cases right.
2440 if (CurContext->isDependentContext())
2441 DelegationInit = Owned(Init);
2443 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(),
2444 DelegationInit.takeAs<Expr>(),
2445 InitRange.getEnd());
2449 Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo,
2450 Expr *Init, CXXRecordDecl *ClassDecl,
2451 SourceLocation EllipsisLoc) {
2452 SourceLocation BaseLoc
2453 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin();
2455 if (!BaseType->isDependentType() && !BaseType->isRecordType())
2456 return Diag(BaseLoc, diag::err_base_init_does_not_name_class)
2457 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
2459 // C++ [class.base.init]p2:
2460 // [...] Unless the mem-initializer-id names a nonstatic data
2461 // member of the constructor's class or a direct or virtual base
2462 // of that class, the mem-initializer is ill-formed. A
2463 // mem-initializer-list can initialize a base class using any
2464 // name that denotes that base class type.
2465 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent();
2467 SourceRange InitRange = Init->getSourceRange();
2468 if (EllipsisLoc.isValid()) {
2469 // This is a pack expansion.
2470 if (!BaseType->containsUnexpandedParameterPack()) {
2471 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
2472 << SourceRange(BaseLoc, InitRange.getEnd());
2474 EllipsisLoc = SourceLocation();
2477 // Check for any unexpanded parameter packs.
2478 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer))
2481 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
2485 // Check for direct and virtual base classes.
2486 const CXXBaseSpecifier *DirectBaseSpec = 0;
2487 const CXXBaseSpecifier *VirtualBaseSpec = 0;
2489 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0),
2491 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl);
2493 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec,
2496 // C++ [base.class.init]p2:
2497 // Unless the mem-initializer-id names a nonstatic data member of the
2498 // constructor's class or a direct or virtual base of that class, the
2499 // mem-initializer is ill-formed.
2500 if (!DirectBaseSpec && !VirtualBaseSpec) {
2501 // If the class has any dependent bases, then it's possible that
2502 // one of those types will resolve to the same type as
2503 // BaseType. Therefore, just treat this as a dependent base
2504 // class initialization. FIXME: Should we try to check the
2505 // initialization anyway? It seems odd.
2506 if (ClassDecl->hasAnyDependentBases())
2509 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual)
2510 << BaseType << Context.getTypeDeclType(ClassDecl)
2511 << BaseTInfo->getTypeLoc().getLocalSourceRange();
2516 DiscardCleanupsInEvaluationContext();
2518 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
2519 /*IsVirtual=*/false,
2520 InitRange.getBegin(), Init,
2521 InitRange.getEnd(), EllipsisLoc);
2524 // C++ [base.class.init]p2:
2525 // If a mem-initializer-id is ambiguous because it designates both
2526 // a direct non-virtual base class and an inherited virtual base
2527 // class, the mem-initializer is ill-formed.
2528 if (DirectBaseSpec && VirtualBaseSpec)
2529 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual)
2530 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
2532 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec);
2534 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec);
2536 // Initialize the base.
2537 bool InitList = true;
2538 Expr **Args = &Init;
2539 unsigned NumArgs = 1;
2540 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
2542 Args = ParenList->getExprs();
2543 NumArgs = ParenList->getNumExprs();
2546 InitializedEntity BaseEntity =
2547 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec);
2548 InitializationKind Kind =
2549 InitList ? InitializationKind::CreateDirectList(BaseLoc)
2550 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(),
2551 InitRange.getEnd());
2552 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs);
2553 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind,
2554 MultiExprArg(Args, NumArgs), 0);
2555 if (BaseInit.isInvalid())
2558 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin());
2560 // C++0x [class.base.init]p7:
2561 // The initialization of each base and member constitutes a
2563 BaseInit = MaybeCreateExprWithCleanups(BaseInit);
2564 if (BaseInit.isInvalid())
2567 // If we are in a dependent context, template instantiation will
2568 // perform this type-checking again. Just save the arguments that we
2569 // received in a ParenListExpr.
2570 // FIXME: This isn't quite ideal, since our ASTs don't capture all
2571 // of the information that we have about the base
2572 // initializer. However, deconstructing the ASTs is a dicey process,
2573 // and this approach is far more likely to get the corner cases right.
2574 if (CurContext->isDependentContext())
2575 BaseInit = Owned(Init);
2577 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
2578 BaseSpec->isVirtual(),
2579 InitRange.getBegin(),
2580 BaseInit.takeAs<Expr>(),
2581 InitRange.getEnd(), EllipsisLoc);
2584 // Create a static_cast\<T&&>(expr).
2585 static Expr *CastForMoving(Sema &SemaRef, Expr *E) {
2586 QualType ExprType = E->getType();
2587 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType);
2588 SourceLocation ExprLoc = E->getLocStart();
2589 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo(
2590 TargetType, ExprLoc);
2592 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E,
2593 SourceRange(ExprLoc, ExprLoc),
2594 E->getSourceRange()).take();
2597 /// ImplicitInitializerKind - How an implicit base or member initializer should
2598 /// initialize its base or member.
2599 enum ImplicitInitializerKind {
2606 BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
2607 ImplicitInitializerKind ImplicitInitKind,
2608 CXXBaseSpecifier *BaseSpec,
2609 bool IsInheritedVirtualBase,
2610 CXXCtorInitializer *&CXXBaseInit) {
2611 InitializedEntity InitEntity
2612 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec,
2613 IsInheritedVirtualBase);
2615 ExprResult BaseInit;
2617 switch (ImplicitInitKind) {
2619 InitializationKind InitKind
2620 = InitializationKind::CreateDefault(Constructor->getLocation());
2621 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0);
2622 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg());
2628 bool Moving = ImplicitInitKind == IIK_Move;
2629 ParmVarDecl *Param = Constructor->getParamDecl(0);
2630 QualType ParamType = Param->getType().getNonReferenceType();
2633 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
2634 SourceLocation(), Param, false,
2635 Constructor->getLocation(), ParamType,
2638 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg));
2640 // Cast to the base class to avoid ambiguities.
2642 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(),
2643 ParamType.getQualifiers());
2646 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg);
2649 CXXCastPath BasePath;
2650 BasePath.push_back(BaseSpec);
2651 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy,
2652 CK_UncheckedDerivedToBase,
2653 Moving ? VK_XValue : VK_LValue,
2656 InitializationKind InitKind
2657 = InitializationKind::CreateDirect(Constructor->getLocation(),
2658 SourceLocation(), SourceLocation());
2659 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind,
2661 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind,
2662 MultiExprArg(&CopyCtorArg, 1));
2667 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit);
2668 if (BaseInit.isInvalid())
2672 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
2673 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(),
2675 BaseSpec->isVirtual(),
2677 BaseInit.takeAs<Expr>(),
2684 static bool RefersToRValueRef(Expr *MemRef) {
2685 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl();
2686 return Referenced->getType()->isRValueReferenceType();
2690 BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
2691 ImplicitInitializerKind ImplicitInitKind,
2692 FieldDecl *Field, IndirectFieldDecl *Indirect,
2693 CXXCtorInitializer *&CXXMemberInit) {
2694 if (Field->isInvalidDecl())
2697 SourceLocation Loc = Constructor->getLocation();
2699 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) {
2700 bool Moving = ImplicitInitKind == IIK_Move;
2701 ParmVarDecl *Param = Constructor->getParamDecl(0);
2702 QualType ParamType = Param->getType().getNonReferenceType();
2704 // Suppress copying zero-width bitfields.
2705 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0)
2708 Expr *MemberExprBase =
2709 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
2710 SourceLocation(), Param, false,
2711 Loc, ParamType, VK_LValue, 0);
2713 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase));
2716 MemberExprBase = CastForMoving(SemaRef, MemberExprBase);
2719 // Build a reference to this field within the parameter.
2721 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc,
2722 Sema::LookupMemberName);
2723 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect)
2724 : cast<ValueDecl>(Field), AS_public);
2725 MemberLookup.resolveKind();
2727 = SemaRef.BuildMemberReferenceExpr(MemberExprBase,
2731 /*TemplateKWLoc=*/SourceLocation(),
2732 /*FirstQualifierInScope=*/0,
2734 /*TemplateArgs=*/0);
2735 if (CtorArg.isInvalid())
2738 // C++11 [class.copy]p15:
2739 // - if a member m has rvalue reference type T&&, it is direct-initialized
2740 // with static_cast<T&&>(x.m);
2741 if (RefersToRValueRef(CtorArg.get())) {
2742 CtorArg = CastForMoving(SemaRef, CtorArg.take());
2745 // When the field we are copying is an array, create index variables for
2746 // each dimension of the array. We use these index variables to subscript
2747 // the source array, and other clients (e.g., CodeGen) will perform the
2748 // necessary iteration with these index variables.
2749 SmallVector<VarDecl *, 4> IndexVariables;
2750 QualType BaseType = Field->getType();
2751 QualType SizeType = SemaRef.Context.getSizeType();
2752 bool InitializingArray = false;
2753 while (const ConstantArrayType *Array
2754 = SemaRef.Context.getAsConstantArrayType(BaseType)) {
2755 InitializingArray = true;
2756 // Create the iteration variable for this array index.
2757 IdentifierInfo *IterationVarName = 0;
2760 llvm::raw_svector_ostream OS(Str);
2761 OS << "__i" << IndexVariables.size();
2762 IterationVarName = &SemaRef.Context.Idents.get(OS.str());
2764 VarDecl *IterationVar
2765 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc,
2766 IterationVarName, SizeType,
2767 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc),
2769 IndexVariables.push_back(IterationVar);
2771 // Create a reference to the iteration variable.
2772 ExprResult IterationVarRef
2773 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc);
2774 assert(!IterationVarRef.isInvalid() &&
2775 "Reference to invented variable cannot fail!");
2776 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take());
2777 assert(!IterationVarRef.isInvalid() &&
2778 "Conversion of invented variable cannot fail!");
2780 // Subscript the array with this iteration variable.
2781 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc,
2782 IterationVarRef.take(),
2784 if (CtorArg.isInvalid())
2787 BaseType = Array->getElementType();
2790 // The array subscript expression is an lvalue, which is wrong for moving.
2791 if (Moving && InitializingArray)
2792 CtorArg = CastForMoving(SemaRef, CtorArg.take());
2794 // Construct the entity that we will be initializing. For an array, this
2795 // will be first element in the array, which may require several levels
2796 // of array-subscript entities.
2797 SmallVector<InitializedEntity, 4> Entities;
2798 Entities.reserve(1 + IndexVariables.size());
2800 Entities.push_back(InitializedEntity::InitializeMember(Indirect));
2802 Entities.push_back(InitializedEntity::InitializeMember(Field));
2803 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I)
2804 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context,
2808 // Direct-initialize to use the copy constructor.
2809 InitializationKind InitKind =
2810 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation());
2812 Expr *CtorArgE = CtorArg.takeAs<Expr>();
2813 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind,
2816 ExprResult MemberInit
2817 = InitSeq.Perform(SemaRef, Entities.back(), InitKind,
2818 MultiExprArg(&CtorArgE, 1));
2819 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
2820 if (MemberInit.isInvalid())
2824 assert(IndexVariables.size() == 0 &&
2825 "Indirect field improperly initialized");
2827 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect,
2829 MemberInit.takeAs<Expr>(),
2832 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc,
2833 Loc, MemberInit.takeAs<Expr>(),
2835 IndexVariables.data(),
2836 IndexVariables.size());
2840 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!");
2842 QualType FieldBaseElementType =
2843 SemaRef.Context.getBaseElementType(Field->getType());
2845 if (FieldBaseElementType->isRecordType()) {
2846 InitializedEntity InitEntity
2847 = Indirect? InitializedEntity::InitializeMember(Indirect)
2848 : InitializedEntity::InitializeMember(Field);
2849 InitializationKind InitKind =
2850 InitializationKind::CreateDefault(Loc);
2852 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0);
2853 ExprResult MemberInit =
2854 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg());
2856 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
2857 if (MemberInit.isInvalid())
2861 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
2867 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
2874 if (!Field->getParent()->isUnion()) {
2875 if (FieldBaseElementType->isReferenceType()) {
2876 SemaRef.Diag(Constructor->getLocation(),
2877 diag::err_uninitialized_member_in_ctor)
2878 << (int)Constructor->isImplicit()
2879 << SemaRef.Context.getTagDeclType(Constructor->getParent())
2880 << 0 << Field->getDeclName();
2881 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
2885 if (FieldBaseElementType.isConstQualified()) {
2886 SemaRef.Diag(Constructor->getLocation(),
2887 diag::err_uninitialized_member_in_ctor)
2888 << (int)Constructor->isImplicit()
2889 << SemaRef.Context.getTagDeclType(Constructor->getParent())
2890 << 1 << Field->getDeclName();
2891 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
2896 if (SemaRef.getLangOpts().ObjCAutoRefCount &&
2897 FieldBaseElementType->isObjCRetainableType() &&
2898 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None &&
2899 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) {
2901 // Default-initialize Objective-C pointers to NULL.
2903 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field,
2905 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()),
2910 // Nothing to initialize.
2916 struct BaseAndFieldInfo {
2918 CXXConstructorDecl *Ctor;
2919 bool AnyErrorsInInits;
2920 ImplicitInitializerKind IIK;
2921 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields;
2922 SmallVector<CXXCtorInitializer*, 8> AllToInit;
2924 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits)
2925 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) {
2926 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted();
2927 if (Generated && Ctor->isCopyConstructor())
2929 else if (Generated && Ctor->isMoveConstructor())
2935 bool isImplicitCopyOrMove() const {
2945 llvm_unreachable("Invalid ImplicitInitializerKind!");
2948 bool addFieldInitializer(CXXCtorInitializer *Init) {
2949 AllToInit.push_back(Init);
2951 // Check whether this initializer makes the field "used".
2952 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context))
2953 S.UnusedPrivateFields.remove(Init->getAnyMember());
2960 /// \brief Determine whether the given indirect field declaration is somewhere
2961 /// within an anonymous union.
2962 static bool isWithinAnonymousUnion(IndirectFieldDecl *F) {
2963 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(),
2964 CEnd = F->chain_end();
2966 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext()))
2967 if (Record->isUnion())
2973 /// \brief Determine whether the given type is an incomplete or zero-lenfgth
2975 static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) {
2976 if (T->isIncompleteArrayType())
2979 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) {
2980 if (!ArrayT->getSize())
2983 T = ArrayT->getElementType();
2989 static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info,
2991 IndirectFieldDecl *Indirect = 0) {
2993 // Overwhelmingly common case: we have a direct initializer for this field.
2994 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field))
2995 return Info.addFieldInitializer(Init);
2997 // C++11 [class.base.init]p8: if the entity is a non-static data member that
2998 // has a brace-or-equal-initializer, the entity is initialized as specified
3000 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) {
3001 CXXCtorInitializer *Init;
3003 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect,
3005 SourceLocation(), 0,
3008 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field,
3010 SourceLocation(), 0,
3012 return Info.addFieldInitializer(Init);
3015 // Don't build an implicit initializer for union members if none was
3016 // explicitly specified.
3017 if (Field->getParent()->isUnion() ||
3018 (Indirect && isWithinAnonymousUnion(Indirect)))
3021 // Don't initialize incomplete or zero-length arrays.
3022 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType()))
3025 // Don't try to build an implicit initializer if there were semantic
3026 // errors in any of the initializers (and therefore we might be
3027 // missing some that the user actually wrote).
3028 if (Info.AnyErrorsInInits || Field->isInvalidDecl())
3031 CXXCtorInitializer *Init = 0;
3032 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field,
3039 return Info.addFieldInitializer(Init);
3043 Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor,
3044 CXXCtorInitializer *Initializer) {
3045 assert(Initializer->isDelegatingInitializer());
3046 Constructor->setNumCtorInitializers(1);
3047 CXXCtorInitializer **initializer =
3048 new (Context) CXXCtorInitializer*[1];
3049 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*));
3050 Constructor->setCtorInitializers(initializer);
3052 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) {
3053 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor);
3054 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation());
3057 DelegatingCtorDecls.push_back(Constructor);
3062 bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor,
3063 CXXCtorInitializer **Initializers,
3064 unsigned NumInitializers,
3066 if (Constructor->isDependentContext()) {
3067 // Just store the initializers as written, they will be checked during
3069 if (NumInitializers > 0) {
3070 Constructor->setNumCtorInitializers(NumInitializers);
3071 CXXCtorInitializer **baseOrMemberInitializers =
3072 new (Context) CXXCtorInitializer*[NumInitializers];
3073 memcpy(baseOrMemberInitializers, Initializers,
3074 NumInitializers * sizeof(CXXCtorInitializer*));
3075 Constructor->setCtorInitializers(baseOrMemberInitializers);
3078 // Let template instantiation know whether we had errors.
3080 Constructor->setInvalidDecl();
3085 BaseAndFieldInfo Info(*this, Constructor, AnyErrors);
3087 // We need to build the initializer AST according to order of construction
3088 // and not what user specified in the Initializers list.
3089 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition();
3093 bool HadError = false;
3095 for (unsigned i = 0; i < NumInitializers; i++) {
3096 CXXCtorInitializer *Member = Initializers[i];
3098 if (Member->isBaseInitializer())
3099 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member;
3101 Info.AllBaseFields[Member->getAnyMember()] = Member;
3104 // Keep track of the direct virtual bases.
3105 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases;
3106 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(),
3107 E = ClassDecl->bases_end(); I != E; ++I) {
3109 DirectVBases.insert(I);
3112 // Push virtual bases before others.
3113 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(),
3114 E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
3116 if (CXXCtorInitializer *Value
3117 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) {
3118 Info.AllToInit.push_back(Value);
3119 } else if (!AnyErrors) {
3120 bool IsInheritedVirtualBase = !DirectVBases.count(VBase);
3121 CXXCtorInitializer *CXXBaseInit;
3122 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
3123 VBase, IsInheritedVirtualBase,
3129 Info.AllToInit.push_back(CXXBaseInit);
3133 // Non-virtual bases.
3134 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
3135 E = ClassDecl->bases_end(); Base != E; ++Base) {
3136 // Virtuals are in the virtual base list and already constructed.
3137 if (Base->isVirtual())
3140 if (CXXCtorInitializer *Value
3141 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) {
3142 Info.AllToInit.push_back(Value);
3143 } else if (!AnyErrors) {
3144 CXXCtorInitializer *CXXBaseInit;
3145 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
3146 Base, /*IsInheritedVirtualBase=*/false,
3152 Info.AllToInit.push_back(CXXBaseInit);
3157 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(),
3158 MemEnd = ClassDecl->decls_end();
3159 Mem != MemEnd; ++Mem) {
3160 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) {
3161 // C++ [class.bit]p2:
3162 // A declaration for a bit-field that omits the identifier declares an
3163 // unnamed bit-field. Unnamed bit-fields are not members and cannot be
3165 if (F->isUnnamedBitfield())
3168 // If we're not generating the implicit copy/move constructor, then we'll
3169 // handle anonymous struct/union fields based on their individual
3171 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default)
3174 if (CollectFieldInitializer(*this, Info, F))
3179 // Beyond this point, we only consider default initialization.
3180 if (Info.IIK != IIK_Default)
3183 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) {
3184 if (F->getType()->isIncompleteArrayType()) {
3185 assert(ClassDecl->hasFlexibleArrayMember() &&
3186 "Incomplete array type is not valid");
3190 // Initialize each field of an anonymous struct individually.
3191 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F))
3198 NumInitializers = Info.AllToInit.size();
3199 if (NumInitializers > 0) {
3200 Constructor->setNumCtorInitializers(NumInitializers);
3201 CXXCtorInitializer **baseOrMemberInitializers =
3202 new (Context) CXXCtorInitializer*[NumInitializers];
3203 memcpy(baseOrMemberInitializers, Info.AllToInit.data(),
3204 NumInitializers * sizeof(CXXCtorInitializer*));
3205 Constructor->setCtorInitializers(baseOrMemberInitializers);
3207 // Constructors implicitly reference the base and member
3209 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(),
3210 Constructor->getParent());
3216 static void *GetKeyForTopLevelField(FieldDecl *Field) {
3217 // For anonymous unions, use the class declaration as the key.
3218 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) {
3219 if (RT->getDecl()->isAnonymousStructOrUnion())
3220 return static_cast<void *>(RT->getDecl());
3222 return static_cast<void *>(Field);
3225 static void *GetKeyForBase(ASTContext &Context, QualType BaseType) {
3226 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr());
3229 static void *GetKeyForMember(ASTContext &Context,
3230 CXXCtorInitializer *Member) {
3231 if (!Member->isAnyMemberInitializer())
3232 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0));
3234 // For fields injected into the class via declaration of an anonymous union,
3235 // use its anonymous union class declaration as the unique key.
3236 FieldDecl *Field = Member->getAnyMember();
3238 // If the field is a member of an anonymous struct or union, our key
3239 // is the anonymous record decl that's a direct child of the class.
3240 RecordDecl *RD = Field->getParent();
3241 if (RD->isAnonymousStructOrUnion()) {
3243 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext());
3244 if (Parent->isAnonymousStructOrUnion())
3250 return static_cast<void *>(RD);
3253 return static_cast<void *>(Field);
3257 DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef,
3258 const CXXConstructorDecl *Constructor,
3259 CXXCtorInitializer **Inits,
3260 unsigned NumInits) {
3261 if (Constructor->getDeclContext()->isDependentContext())
3264 // Don't check initializers order unless the warning is enabled at the
3265 // location of at least one initializer.
3266 bool ShouldCheckOrder = false;
3267 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) {
3268 CXXCtorInitializer *Init = Inits[InitIndex];
3269 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order,
3270 Init->getSourceLocation())
3271 != DiagnosticsEngine::Ignored) {
3272 ShouldCheckOrder = true;
3276 if (!ShouldCheckOrder)
3279 // Build the list of bases and members in the order that they'll
3280 // actually be initialized. The explicit initializers should be in
3281 // this same order but may be missing things.
3282 SmallVector<const void*, 32> IdealInitKeys;
3284 const CXXRecordDecl *ClassDecl = Constructor->getParent();
3286 // 1. Virtual bases.
3287 for (CXXRecordDecl::base_class_const_iterator VBase =
3288 ClassDecl->vbases_begin(),
3289 E = ClassDecl->vbases_end(); VBase != E; ++VBase)
3290 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType()));
3292 // 2. Non-virtual bases.
3293 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(),
3294 E = ClassDecl->bases_end(); Base != E; ++Base) {
3295 if (Base->isVirtual())
3297 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType()));
3300 // 3. Direct fields.
3301 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
3302 E = ClassDecl->field_end(); Field != E; ++Field) {
3303 if (Field->isUnnamedBitfield())
3306 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field));
3309 unsigned NumIdealInits = IdealInitKeys.size();
3310 unsigned IdealIndex = 0;
3312 CXXCtorInitializer *PrevInit = 0;
3313 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) {
3314 CXXCtorInitializer *Init = Inits[InitIndex];
3315 void *InitKey = GetKeyForMember(SemaRef.Context, Init);
3317 // Scan forward to try to find this initializer in the idealized
3318 // initializers list.
3319 for (; IdealIndex != NumIdealInits; ++IdealIndex)
3320 if (InitKey == IdealInitKeys[IdealIndex])
3323 // If we didn't find this initializer, it must be because we
3324 // scanned past it on a previous iteration. That can only
3325 // happen if we're out of order; emit a warning.
3326 if (IdealIndex == NumIdealInits && PrevInit) {
3327 Sema::SemaDiagnosticBuilder D =
3328 SemaRef.Diag(PrevInit->getSourceLocation(),
3329 diag::warn_initializer_out_of_order);
3331 if (PrevInit->isAnyMemberInitializer())
3332 D << 0 << PrevInit->getAnyMember()->getDeclName();
3334 D << 1 << PrevInit->getTypeSourceInfo()->getType();
3336 if (Init->isAnyMemberInitializer())
3337 D << 0 << Init->getAnyMember()->getDeclName();
3339 D << 1 << Init->getTypeSourceInfo()->getType();
3341 // Move back to the initializer's location in the ideal list.
3342 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex)
3343 if (InitKey == IdealInitKeys[IdealIndex])
3346 assert(IdealIndex != NumIdealInits &&
3347 "initializer not found in initializer list");
3355 bool CheckRedundantInit(Sema &S,
3356 CXXCtorInitializer *Init,
3357 CXXCtorInitializer *&PrevInit) {
3363 if (FieldDecl *Field = Init->getMember())
3364 S.Diag(Init->getSourceLocation(),
3365 diag::err_multiple_mem_initialization)
3366 << Field->getDeclName()
3367 << Init->getSourceRange();
3369 const Type *BaseClass = Init->getBaseClass();
3370 assert(BaseClass && "neither field nor base");
3371 S.Diag(Init->getSourceLocation(),
3372 diag::err_multiple_base_initialization)
3373 << QualType(BaseClass, 0)
3374 << Init->getSourceRange();
3376 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer)
3377 << 0 << PrevInit->getSourceRange();
3382 typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry;
3383 typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap;
3385 bool CheckRedundantUnionInit(Sema &S,
3386 CXXCtorInitializer *Init,
3387 RedundantUnionMap &Unions) {
3388 FieldDecl *Field = Init->getAnyMember();
3389 RecordDecl *Parent = Field->getParent();
3390 NamedDecl *Child = Field;
3392 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) {
3393 if (Parent->isUnion()) {
3394 UnionEntry &En = Unions[Parent];
3395 if (En.first && En.first != Child) {
3396 S.Diag(Init->getSourceLocation(),
3397 diag::err_multiple_mem_union_initialization)
3398 << Field->getDeclName()
3399 << Init->getSourceRange();
3400 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer)
3401 << 0 << En.second->getSourceRange();
3408 if (!Parent->isAnonymousStructOrUnion())
3413 Parent = cast<RecordDecl>(Parent->getDeclContext());
3420 /// ActOnMemInitializers - Handle the member initializers for a constructor.
3421 void Sema::ActOnMemInitializers(Decl *ConstructorDecl,
3422 SourceLocation ColonLoc,
3423 CXXCtorInitializer **meminits,
3424 unsigned NumMemInits,
3426 if (!ConstructorDecl)
3429 AdjustDeclIfTemplate(ConstructorDecl);
3431 CXXConstructorDecl *Constructor
3432 = dyn_cast<CXXConstructorDecl>(ConstructorDecl);
3435 Diag(ColonLoc, diag::err_only_constructors_take_base_inits);
3439 CXXCtorInitializer **MemInits =
3440 reinterpret_cast<CXXCtorInitializer **>(meminits);
3442 // Mapping for the duplicate initializers check.
3443 // For member initializers, this is keyed with a FieldDecl*.
3444 // For base initializers, this is keyed with a Type*.
3445 llvm::DenseMap<void*, CXXCtorInitializer *> Members;
3447 // Mapping for the inconsistent anonymous-union initializers check.
3448 RedundantUnionMap MemberUnions;
3450 bool HadError = false;
3451 for (unsigned i = 0; i < NumMemInits; i++) {
3452 CXXCtorInitializer *Init = MemInits[i];
3454 // Set the source order index.
3455 Init->setSourceOrder(i);
3457 if (Init->isAnyMemberInitializer()) {
3458 FieldDecl *Field = Init->getAnyMember();
3459 if (CheckRedundantInit(*this, Init, Members[Field]) ||
3460 CheckRedundantUnionInit(*this, Init, MemberUnions))
3462 } else if (Init->isBaseInitializer()) {
3463 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0));
3464 if (CheckRedundantInit(*this, Init, Members[Key]))
3467 assert(Init->isDelegatingInitializer());
3468 // This must be the only initializer
3469 if (NumMemInits != 1) {
3470 Diag(Init->getSourceLocation(),
3471 diag::err_delegating_initializer_alone)
3472 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange();
3473 // We will treat this as being the only initializer.
3475 SetDelegatingInitializer(Constructor, MemInits[i]);
3476 // Return immediately as the initializer is set.
3484 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits);
3486 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors);
3490 Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location,
3491 CXXRecordDecl *ClassDecl) {
3492 // Ignore dependent contexts. Also ignore unions, since their members never
3493 // have destructors implicitly called.
3494 if (ClassDecl->isDependentContext() || ClassDecl->isUnion())
3497 // FIXME: all the access-control diagnostics are positioned on the
3498 // field/base declaration. That's probably good; that said, the
3499 // user might reasonably want to know why the destructor is being
3500 // emitted, and we currently don't say.
3502 // Non-static data members.
3503 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(),
3504 E = ClassDecl->field_end(); I != E; ++I) {
3505 FieldDecl *Field = *I;
3506 if (Field->isInvalidDecl())
3509 // Don't destroy incomplete or zero-length arrays.
3510 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType()))
3513 QualType FieldType = Context.getBaseElementType(Field->getType());
3515 const RecordType* RT = FieldType->getAs<RecordType>();
3519 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
3520 if (FieldClassDecl->isInvalidDecl())
3522 if (FieldClassDecl->hasIrrelevantDestructor())
3524 // The destructor for an implicit anonymous union member is never invoked.
3525 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion())
3528 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl);
3529 assert(Dtor && "No dtor found for FieldClassDecl!");
3530 CheckDestructorAccess(Field->getLocation(), Dtor,
3531 PDiag(diag::err_access_dtor_field)
3532 << Field->getDeclName()
3535 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor));
3536 DiagnoseUseOfDecl(Dtor, Location);
3539 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases;
3542 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
3543 E = ClassDecl->bases_end(); Base != E; ++Base) {
3544 // Bases are always records in a well-formed non-dependent class.
3545 const RecordType *RT = Base->getType()->getAs<RecordType>();
3547 // Remember direct virtual bases.
3548 if (Base->isVirtual())
3549 DirectVirtualBases.insert(RT);
3551 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
3552 // If our base class is invalid, we probably can't get its dtor anyway.
3553 if (BaseClassDecl->isInvalidDecl())
3555 if (BaseClassDecl->hasIrrelevantDestructor())
3558 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
3559 assert(Dtor && "No dtor found for BaseClassDecl!");
3561 // FIXME: caret should be on the start of the class name
3562 CheckDestructorAccess(Base->getLocStart(), Dtor,
3563 PDiag(diag::err_access_dtor_base)
3565 << Base->getSourceRange(),
3566 Context.getTypeDeclType(ClassDecl));
3568 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor));
3569 DiagnoseUseOfDecl(Dtor, Location);
3573 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(),
3574 E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
3576 // Bases are always records in a well-formed non-dependent class.
3577 const RecordType *RT = VBase->getType()->castAs<RecordType>();
3579 // Ignore direct virtual bases.
3580 if (DirectVirtualBases.count(RT))
3583 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
3584 // If our base class is invalid, we probably can't get its dtor anyway.
3585 if (BaseClassDecl->isInvalidDecl())
3587 if (BaseClassDecl->hasIrrelevantDestructor())
3590 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
3591 assert(Dtor && "No dtor found for BaseClassDecl!");
3592 CheckDestructorAccess(ClassDecl->getLocation(), Dtor,
3593 PDiag(diag::err_access_dtor_vbase)
3594 << VBase->getType(),
3595 Context.getTypeDeclType(ClassDecl));
3597 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor));
3598 DiagnoseUseOfDecl(Dtor, Location);
3602 void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) {
3606 if (CXXConstructorDecl *Constructor
3607 = dyn_cast<CXXConstructorDecl>(CDtorDecl))
3608 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false);
3611 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
3612 unsigned DiagID, AbstractDiagSelID SelID) {
3613 class NonAbstractTypeDiagnoser : public TypeDiagnoser {
3615 AbstractDiagSelID SelID;
3618 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID)
3619 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { }
3621 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) {
3622 if (Suppressed) return;
3624 S.Diag(Loc, DiagID) << T;
3626 S.Diag(Loc, DiagID) << SelID << T;
3628 } Diagnoser(DiagID, SelID);
3630 return RequireNonAbstractType(Loc, T, Diagnoser);
3633 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
3634 TypeDiagnoser &Diagnoser) {
3635 if (!getLangOpts().CPlusPlus)
3638 if (const ArrayType *AT = Context.getAsArrayType(T))
3639 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser);
3641 if (const PointerType *PT = T->getAs<PointerType>()) {
3642 // Find the innermost pointer type.
3643 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>())
3646 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType()))
3647 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser);
3650 const RecordType *RT = T->getAs<RecordType>();
3654 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
3656 // We can't answer whether something is abstract until it has a
3657 // definition. If it's currently being defined, we'll walk back
3658 // over all the declarations when we have a full definition.
3659 const CXXRecordDecl *Def = RD->getDefinition();
3660 if (!Def || Def->isBeingDefined())
3663 if (!RD->isAbstract())
3666 Diagnoser.diagnose(*this, Loc, T);
3667 DiagnoseAbstractType(RD);
3672 void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) {
3673 // Check if we've already emitted the list of pure virtual functions
3675 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD))
3678 CXXFinalOverriderMap FinalOverriders;
3679 RD->getFinalOverriders(FinalOverriders);
3681 // Keep a set of seen pure methods so we won't diagnose the same method
3683 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods;
3685 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
3686 MEnd = FinalOverriders.end();
3689 for (OverridingMethods::iterator SO = M->second.begin(),
3690 SOEnd = M->second.end();
3691 SO != SOEnd; ++SO) {
3692 // C++ [class.abstract]p4:
3693 // A class is abstract if it contains or inherits at least one
3694 // pure virtual function for which the final overrider is pure
3698 if (SO->second.size() != 1)
3701 if (!SO->second.front().Method->isPure())
3704 if (!SeenPureMethods.insert(SO->second.front().Method))
3707 Diag(SO->second.front().Method->getLocation(),
3708 diag::note_pure_virtual_function)
3709 << SO->second.front().Method->getDeclName() << RD->getDeclName();
3713 if (!PureVirtualClassDiagSet)
3714 PureVirtualClassDiagSet.reset(new RecordDeclSetTy);
3715 PureVirtualClassDiagSet->insert(RD);
3719 struct AbstractUsageInfo {
3721 CXXRecordDecl *Record;
3722 CanQualType AbstractType;
3725 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record)
3726 : S(S), Record(Record),
3727 AbstractType(S.Context.getCanonicalType(
3728 S.Context.getTypeDeclType(Record))),
3731 void DiagnoseAbstractType() {
3732 if (Invalid) return;
3733 S.DiagnoseAbstractType(Record);
3737 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel);
3740 struct CheckAbstractUsage {
3741 AbstractUsageInfo &Info;
3742 const NamedDecl *Ctx;
3744 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx)
3745 : Info(Info), Ctx(Ctx) {}
3747 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
3748 switch (TL.getTypeLocClass()) {
3749 #define ABSTRACT_TYPELOC(CLASS, PARENT)
3750 #define TYPELOC(CLASS, PARENT) \
3751 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break;
3752 #include "clang/AST/TypeLocNodes.def"
3756 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) {
3757 Visit(TL.getResultLoc(), Sema::AbstractReturnType);
3758 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
3762 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo();
3763 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType);
3767 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) {
3768 Visit(TL.getElementLoc(), Sema::AbstractArrayType);
3771 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) {
3772 // Visit the type parameters from a permissive context.
3773 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
3774 TemplateArgumentLoc TAL = TL.getArgLoc(I);
3775 if (TAL.getArgument().getKind() == TemplateArgument::Type)
3776 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo())
3777 Visit(TSI->getTypeLoc(), Sema::AbstractNone);
3778 // TODO: other template argument types?
3782 // Visit pointee types from a permissive context.
3783 #define CheckPolymorphic(Type) \
3784 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \
3785 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \
3787 CheckPolymorphic(PointerTypeLoc)
3788 CheckPolymorphic(ReferenceTypeLoc)
3789 CheckPolymorphic(MemberPointerTypeLoc)
3790 CheckPolymorphic(BlockPointerTypeLoc)
3791 CheckPolymorphic(AtomicTypeLoc)
3793 /// Handle all the types we haven't given a more specific
3794 /// implementation for above.
3795 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
3796 // Every other kind of type that we haven't called out already
3797 // that has an inner type is either (1) sugar or (2) contains that
3798 // inner type in some way as a subobject.
3799 if (TypeLoc Next = TL.getNextTypeLoc())
3800 return Visit(Next, Sel);
3802 // If there's no inner type and we're in a permissive context,
3804 if (Sel == Sema::AbstractNone) return;
3806 // Check whether the type matches the abstract type.
3807 QualType T = TL.getType();
3808 if (T->isArrayType()) {
3809 Sel = Sema::AbstractArrayType;
3810 T = Info.S.Context.getBaseElementType(T);
3812 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType();
3813 if (CT != Info.AbstractType) return;
3815 // It matched; do some magic.
3816 if (Sel == Sema::AbstractArrayType) {
3817 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type)
3818 << T << TL.getSourceRange();
3820 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl)
3821 << Sel << T << TL.getSourceRange();
3823 Info.DiagnoseAbstractType();
3827 void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL,
3828 Sema::AbstractDiagSelID Sel) {
3829 CheckAbstractUsage(*this, D).Visit(TL, Sel);
3834 /// Check for invalid uses of an abstract type in a method declaration.
3835 static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
3836 CXXMethodDecl *MD) {
3837 // No need to do the check on definitions, which require that
3838 // the return/param types be complete.
3839 if (MD->doesThisDeclarationHaveABody())
3842 // For safety's sake, just ignore it if we don't have type source
3843 // information. This should never happen for non-implicit methods,
3845 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
3846 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone);
3849 /// Check for invalid uses of an abstract type within a class definition.
3850 static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
3851 CXXRecordDecl *RD) {
3852 for (CXXRecordDecl::decl_iterator
3853 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) {
3855 if (D->isImplicit()) continue;
3857 // Methods and method templates.
3858 if (isa<CXXMethodDecl>(D)) {
3859 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D));
3860 } else if (isa<FunctionTemplateDecl>(D)) {
3861 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl();
3862 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD));
3864 // Fields and static variables.
3865 } else if (isa<FieldDecl>(D)) {
3866 FieldDecl *FD = cast<FieldDecl>(D);
3867 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo())
3868 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType);
3869 } else if (isa<VarDecl>(D)) {
3870 VarDecl *VD = cast<VarDecl>(D);
3871 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo())
3872 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType);
3874 // Nested classes and class templates.
3875 } else if (isa<CXXRecordDecl>(D)) {
3876 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D));
3877 } else if (isa<ClassTemplateDecl>(D)) {
3878 CheckAbstractClassUsage(Info,
3879 cast<ClassTemplateDecl>(D)->getTemplatedDecl());
3884 /// \brief Perform semantic checks on a class definition that has been
3885 /// completing, introducing implicitly-declared members, checking for
3886 /// abstract types, etc.
3887 void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) {
3891 if (Record->isAbstract() && !Record->isInvalidDecl()) {
3892 AbstractUsageInfo Info(*this, Record);
3893 CheckAbstractClassUsage(Info, Record);
3896 // If this is not an aggregate type and has no user-declared constructor,
3897 // complain about any non-static data members of reference or const scalar
3898 // type, since they will never get initializers.
3899 if (!Record->isInvalidDecl() && !Record->isDependentType() &&
3900 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() &&
3901 !Record->isLambda()) {
3902 bool Complained = false;
3903 for (RecordDecl::field_iterator F = Record->field_begin(),
3904 FEnd = Record->field_end();
3906 if (F->hasInClassInitializer() || F->isUnnamedBitfield())
3909 if (F->getType()->isReferenceType() ||
3910 (F->getType().isConstQualified() && F->getType()->isScalarType())) {
3912 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst)
3913 << Record->getTagKind() << Record;
3917 Diag(F->getLocation(), diag::note_refconst_member_not_initialized)
3918 << F->getType()->isReferenceType()
3919 << F->getDeclName();
3924 if (Record->isDynamicClass() && !Record->isDependentType())
3925 DynamicClasses.push_back(Record);
3927 if (Record->getIdentifier()) {
3928 // C++ [class.mem]p13:
3929 // If T is the name of a class, then each of the following shall have a
3930 // name different from T:
3931 // - every member of every anonymous union that is a member of class T.
3933 // C++ [class.mem]p14:
3934 // In addition, if class T has a user-declared constructor (12.1), every
3935 // non-static data member of class T shall have a name different from T.
3936 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName());
3937 R.first != R.second; ++R.first) {
3938 NamedDecl *D = *R.first;
3939 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) ||
3940 isa<IndirectFieldDecl>(D)) {
3941 Diag(D->getLocation(), diag::err_member_name_of_class)
3942 << D->getDeclName();
3948 // Warn if the class has virtual methods but non-virtual public destructor.
3949 if (Record->isPolymorphic() && !Record->isDependentType()) {
3950 CXXDestructorDecl *dtor = Record->getDestructor();
3951 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public))
3952 Diag(dtor ? dtor->getLocation() : Record->getLocation(),
3953 diag::warn_non_virtual_dtor) << Context.getRecordType(Record);
3956 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) {
3957 Diag(Record->getLocation(), diag::warn_abstract_final_class);
3958 DiagnoseAbstractType(Record);
3961 // See if a method overloads virtual methods in a base
3962 /// class without overriding any.
3963 if (!Record->isDependentType()) {
3964 for (CXXRecordDecl::method_iterator M = Record->method_begin(),
3965 MEnd = Record->method_end();
3968 DiagnoseHiddenVirtualMethods(Record, *M);
3972 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member
3973 // function that is not a constructor declares that member function to be
3974 // const. [...] The class of which that function is a member shall be
3977 // If the class has virtual bases, any constexpr members will already have
3978 // been diagnosed by the checks performed on the member declaration, so
3979 // suppress this (less useful) diagnostic.
3980 if (LangOpts.CPlusPlus0x && !Record->isDependentType() &&
3981 !Record->isLiteral() && !Record->getNumVBases()) {
3982 for (CXXRecordDecl::method_iterator M = Record->method_begin(),
3983 MEnd = Record->method_end();
3985 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) {
3986 switch (Record->getTemplateSpecializationKind()) {
3987 case TSK_ImplicitInstantiation:
3988 case TSK_ExplicitInstantiationDeclaration:
3989 case TSK_ExplicitInstantiationDefinition:
3990 // If a template instantiates to a non-literal type, but its members
3991 // instantiate to constexpr functions, the template is technically
3992 // ill-formed, but we allow it for sanity.
3995 case TSK_Undeclared:
3996 case TSK_ExplicitSpecialization:
3997 RequireLiteralType(M->getLocation(), Context.getRecordType(Record),
3998 diag::err_constexpr_method_non_literal);
4002 // Only produce one error per class.
4008 // Declare inherited constructors. We do this eagerly here because:
4009 // - The standard requires an eager diagnostic for conflicting inherited
4010 // constructors from different classes.
4011 // - The lazy declaration of the other implicit constructors is so as to not
4012 // waste space and performance on classes that are not meant to be
4013 // instantiated (e.g. meta-functions). This doesn't apply to classes that
4014 // have inherited constructors.
4015 DeclareInheritedConstructors(Record);
4018 void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) {
4019 for (CXXRecordDecl::method_iterator MI = Record->method_begin(),
4020 ME = Record->method_end();
4022 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted())
4023 CheckExplicitlyDefaultedSpecialMember(*MI);
4026 /// Is the special member function which would be selected to perform the
4027 /// specified operation on the specified class type a constexpr constructor?
4028 static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl,
4029 Sema::CXXSpecialMember CSM,
4031 Sema::SpecialMemberOverloadResult *SMOR =
4032 S.LookupSpecialMember(ClassDecl, CSM, ConstArg,
4033 false, false, false, false);
4034 if (!SMOR || !SMOR->getMethod())
4035 // A constructor we wouldn't select can't be "involved in initializing"
4038 return SMOR->getMethod()->isConstexpr();
4041 /// Determine whether the specified special member function would be constexpr
4042 /// if it were implicitly defined.
4043 static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl,
4044 Sema::CXXSpecialMember CSM,
4046 if (!S.getLangOpts().CPlusPlus0x)
4049 // C++11 [dcl.constexpr]p4:
4050 // In the definition of a constexpr constructor [...]
4052 case Sema::CXXDefaultConstructor:
4053 // Since default constructor lookup is essentially trivial (and cannot
4054 // involve, for instance, template instantiation), we compute whether a
4055 // defaulted default constructor is constexpr directly within CXXRecordDecl.
4057 // This is important for performance; we need to know whether the default
4058 // constructor is constexpr to determine whether the type is a literal type.
4059 return ClassDecl->defaultedDefaultConstructorIsConstexpr();
4061 case Sema::CXXCopyConstructor:
4062 case Sema::CXXMoveConstructor:
4063 // For copy or move constructors, we need to perform overload resolution.
4066 case Sema::CXXCopyAssignment:
4067 case Sema::CXXMoveAssignment:
4068 case Sema::CXXDestructor:
4069 case Sema::CXXInvalid:
4073 // -- if the class is a non-empty union, or for each non-empty anonymous
4074 // union member of a non-union class, exactly one non-static data member
4075 // shall be initialized; [DR1359]
4077 // If we squint, this is guaranteed, since exactly one non-static data member
4078 // will be initialized (if the constructor isn't deleted), we just don't know
4080 if (ClassDecl->isUnion())
4083 // -- the class shall not have any virtual base classes;
4084 if (ClassDecl->getNumVBases())
4087 // -- every constructor involved in initializing [...] base class
4088 // sub-objects shall be a constexpr constructor;
4089 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
4090 BEnd = ClassDecl->bases_end();
4092 const RecordType *BaseType = B->getType()->getAs<RecordType>();
4093 if (!BaseType) continue;
4095 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
4096 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg))
4100 // -- every constructor involved in initializing non-static data members
4101 // [...] shall be a constexpr constructor;
4102 // -- every non-static data member and base class sub-object shall be
4104 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
4105 FEnd = ClassDecl->field_end();
4107 if (F->isInvalidDecl())
4109 if (const RecordType *RecordTy =
4110 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) {
4111 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
4112 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg))
4117 // All OK, it's constexpr!
4121 static Sema::ImplicitExceptionSpecification
4122 computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) {
4123 switch (S.getSpecialMember(MD)) {
4124 case Sema::CXXDefaultConstructor:
4125 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD);
4126 case Sema::CXXCopyConstructor:
4127 return S.ComputeDefaultedCopyCtorExceptionSpec(MD);
4128 case Sema::CXXCopyAssignment:
4129 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD);
4130 case Sema::CXXMoveConstructor:
4131 return S.ComputeDefaultedMoveCtorExceptionSpec(MD);
4132 case Sema::CXXMoveAssignment:
4133 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD);
4134 case Sema::CXXDestructor:
4135 return S.ComputeDefaultedDtorExceptionSpec(MD);
4136 case Sema::CXXInvalid:
4139 llvm_unreachable("only special members have implicit exception specs");
4143 updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT,
4144 const Sema::ImplicitExceptionSpecification &ExceptSpec) {
4145 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
4146 ExceptSpec.getEPI(EPI);
4147 const FunctionProtoType *NewFPT = cast<FunctionProtoType>(
4148 S.Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(),
4149 FPT->getNumArgs(), EPI));
4150 FD->setType(QualType(NewFPT, 0));
4153 void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) {
4154 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
4155 if (FPT->getExceptionSpecType() != EST_Unevaluated)
4158 // Evaluate the exception specification.
4159 ImplicitExceptionSpecification ExceptSpec =
4160 computeImplicitExceptionSpec(*this, Loc, MD);
4162 // Update the type of the special member to use it.
4163 updateExceptionSpec(*this, MD, FPT, ExceptSpec);
4165 // A user-provided destructor can be defined outside the class. When that
4166 // happens, be sure to update the exception specification on both
4168 const FunctionProtoType *CanonicalFPT =
4169 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>();
4170 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated)
4171 updateExceptionSpec(*this, MD->getCanonicalDecl(),
4172 CanonicalFPT, ExceptSpec);
4175 static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl);
4176 static bool isImplicitCopyAssignmentArgConst(Sema &S, CXXRecordDecl *ClassDecl);
4178 void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) {
4179 CXXRecordDecl *RD = MD->getParent();
4180 CXXSpecialMember CSM = getSpecialMember(MD);
4182 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid &&
4183 "not an explicitly-defaulted special member");
4185 // Whether this was the first-declared instance of the constructor.
4186 // This affects whether we implicitly add an exception spec and constexpr.
4187 bool First = MD == MD->getCanonicalDecl();
4189 bool HadError = false;
4191 // C++11 [dcl.fct.def.default]p1:
4192 // A function that is explicitly defaulted shall
4193 // -- be a special member function (checked elsewhere),
4194 // -- have the same type (except for ref-qualifiers, and except that a
4195 // copy operation can take a non-const reference) as an implicit
4197 // -- not have default arguments.
4198 unsigned ExpectedParams = 1;
4199 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor)
4201 if (MD->getNumParams() != ExpectedParams) {
4202 // This also checks for default arguments: a copy or move constructor with a
4203 // default argument is classified as a default constructor, and assignment
4204 // operations and destructors can't have default arguments.
4205 Diag(MD->getLocation(), diag::err_defaulted_special_member_params)
4206 << CSM << MD->getSourceRange();
4210 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>();
4212 // Compute argument constness, constexpr, and triviality.
4213 bool CanHaveConstParam = false;
4214 bool Trivial = false;
4216 case CXXDefaultConstructor:
4217 Trivial = RD->hasTrivialDefaultConstructor();
4219 case CXXCopyConstructor:
4220 CanHaveConstParam = isImplicitCopyCtorArgConst(*this, RD);
4221 Trivial = RD->hasTrivialCopyConstructor();
4223 case CXXCopyAssignment:
4224 CanHaveConstParam = isImplicitCopyAssignmentArgConst(*this, RD);
4225 Trivial = RD->hasTrivialCopyAssignment();
4227 case CXXMoveConstructor:
4228 Trivial = RD->hasTrivialMoveConstructor();
4230 case CXXMoveAssignment:
4231 Trivial = RD->hasTrivialMoveAssignment();
4234 Trivial = RD->hasTrivialDestructor();
4237 llvm_unreachable("non-special member explicitly defaulted!");
4240 QualType ReturnType = Context.VoidTy;
4241 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) {
4242 // Check for return type matching.
4243 ReturnType = Type->getResultType();
4244 QualType ExpectedReturnType =
4245 Context.getLValueReferenceType(Context.getTypeDeclType(RD));
4246 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) {
4247 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type)
4248 << (CSM == CXXMoveAssignment) << ExpectedReturnType;
4252 // A defaulted special member cannot have cv-qualifiers.
4253 if (Type->getTypeQuals()) {
4254 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals)
4255 << (CSM == CXXMoveAssignment);
4260 // Check for parameter type matching.
4261 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType();
4262 bool HasConstParam = false;
4263 if (ExpectedParams && ArgType->isReferenceType()) {
4264 // Argument must be reference to possibly-const T.
4265 QualType ReferentType = ArgType->getPointeeType();
4266 HasConstParam = ReferentType.isConstQualified();
4268 if (ReferentType.isVolatileQualified()) {
4269 Diag(MD->getLocation(),
4270 diag::err_defaulted_special_member_volatile_param) << CSM;
4274 if (HasConstParam && !CanHaveConstParam) {
4275 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) {
4276 Diag(MD->getLocation(),
4277 diag::err_defaulted_special_member_copy_const_param)
4278 << (CSM == CXXCopyAssignment);
4279 // FIXME: Explain why this special member can't be const.
4281 Diag(MD->getLocation(),
4282 diag::err_defaulted_special_member_move_const_param)
4283 << (CSM == CXXMoveAssignment);
4288 // If a function is explicitly defaulted on its first declaration, it shall
4289 // have the same parameter type as if it had been implicitly declared.
4290 // (Presumably this is to prevent it from being trivial?)
4291 if (!HasConstParam && CanHaveConstParam && First)
4292 Diag(MD->getLocation(),
4293 diag::err_defaulted_special_member_copy_non_const_param)
4294 << (CSM == CXXCopyAssignment);
4295 } else if (ExpectedParams) {
4296 // A copy assignment operator can take its argument by value, but a
4297 // defaulted one cannot.
4298 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument");
4299 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref);
4303 // Rebuild the type with the implicit exception specification added, if we
4304 // are going to need it.
4305 const FunctionProtoType *ImplicitType = 0;
4306 if (First || Type->hasExceptionSpec()) {
4307 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo();
4308 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI);
4309 ImplicitType = cast<FunctionProtoType>(
4310 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI));
4313 // C++11 [dcl.fct.def.default]p2:
4314 // An explicitly-defaulted function may be declared constexpr only if it
4315 // would have been implicitly declared as constexpr,
4316 // Do not apply this rule to members of class templates, since core issue 1358
4317 // makes such functions always instantiate to constexpr functions. For
4318 // non-constructors, this is checked elsewhere.
4319 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM,
4321 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr &&
4322 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) {
4323 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM;
4324 // FIXME: Explain why the constructor can't be constexpr.
4327 // and may have an explicit exception-specification only if it is compatible
4328 // with the exception-specification on the implicit declaration.
4329 if (Type->hasExceptionSpec() &&
4330 CheckEquivalentExceptionSpec(
4331 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM,
4332 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation()))
4335 // If a function is explicitly defaulted on its first declaration,
4337 // -- it is implicitly considered to be constexpr if the implicit
4338 // definition would be,
4339 MD->setConstexpr(Constexpr);
4341 // -- it is implicitly considered to have the same exception-specification
4342 // as if it had been implicitly declared,
4343 MD->setType(QualType(ImplicitType, 0));
4345 // Such a function is also trivial if the implicitly-declared function
4347 MD->setTrivial(Trivial);
4350 if (ShouldDeleteSpecialMember(MD, CSM)) {
4352 MD->setDeletedAsWritten();
4354 // C++11 [dcl.fct.def.default]p4:
4355 // [For a] user-provided explicitly-defaulted function [...] if such a
4356 // function is implicitly defined as deleted, the program is ill-formed.
4357 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM;
4363 MD->setInvalidDecl();
4367 struct SpecialMemberDeletionInfo {
4370 Sema::CXXSpecialMember CSM;
4373 // Properties of the special member, computed for convenience.
4374 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg;
4377 bool AllFieldsAreConst;
4379 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD,
4380 Sema::CXXSpecialMember CSM, bool Diagnose)
4381 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose),
4382 IsConstructor(false), IsAssignment(false), IsMove(false),
4383 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()),
4384 AllFieldsAreConst(true) {
4386 case Sema::CXXDefaultConstructor:
4387 case Sema::CXXCopyConstructor:
4388 IsConstructor = true;
4390 case Sema::CXXMoveConstructor:
4391 IsConstructor = true;
4394 case Sema::CXXCopyAssignment:
4395 IsAssignment = true;
4397 case Sema::CXXMoveAssignment:
4398 IsAssignment = true;
4401 case Sema::CXXDestructor:
4403 case Sema::CXXInvalid:
4404 llvm_unreachable("invalid special member kind");
4407 if (MD->getNumParams()) {
4408 ConstArg = MD->getParamDecl(0)->getType().isConstQualified();
4409 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified();
4413 bool inUnion() const { return MD->getParent()->isUnion(); }
4415 /// Look up the corresponding special member in the given class.
4416 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class,
4418 unsigned TQ = MD->getTypeQualifiers();
4419 // cv-qualifiers on class members don't affect default ctor / dtor calls.
4420 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor)
4422 return S.LookupSpecialMember(Class, CSM,
4423 ConstArg || (Quals & Qualifiers::Const),
4424 VolatileArg || (Quals & Qualifiers::Volatile),
4425 MD->getRefQualifier() == RQ_RValue,
4426 TQ & Qualifiers::Const,
4427 TQ & Qualifiers::Volatile);
4430 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject;
4432 bool shouldDeleteForBase(CXXBaseSpecifier *Base);
4433 bool shouldDeleteForField(FieldDecl *FD);
4434 bool shouldDeleteForAllConstMembers();
4436 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj,
4438 bool shouldDeleteForSubobjectCall(Subobject Subobj,
4439 Sema::SpecialMemberOverloadResult *SMOR,
4440 bool IsDtorCallInCtor);
4442 bool isAccessible(Subobject Subobj, CXXMethodDecl *D);
4446 /// Is the given special member inaccessible when used on the given
4448 bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj,
4449 CXXMethodDecl *target) {
4450 /// If we're operating on a base class, the object type is the
4451 /// type of this special member.
4453 AccessSpecifier access = target->getAccess();
4454 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) {
4455 objectTy = S.Context.getTypeDeclType(MD->getParent());
4456 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access);
4458 // If we're operating on a field, the object type is the type of the field.
4460 objectTy = S.Context.getTypeDeclType(target->getParent());
4463 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy);
4466 /// Check whether we should delete a special member due to the implicit
4467 /// definition containing a call to a special member of a subobject.
4468 bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall(
4469 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR,
4470 bool IsDtorCallInCtor) {
4471 CXXMethodDecl *Decl = SMOR->getMethod();
4472 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
4476 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)
4477 DiagKind = !Decl ? 0 : 1;
4478 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
4480 else if (!isAccessible(Subobj, Decl))
4482 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() &&
4483 !Decl->isTrivial()) {
4484 // A member of a union must have a trivial corresponding special member.
4485 // As a weird special case, a destructor call from a union's constructor
4486 // must be accessible and non-deleted, but need not be trivial. Such a
4487 // destructor is never actually called, but is semantically checked as
4497 S.Diag(Field->getLocation(),
4498 diag::note_deleted_special_member_class_subobject)
4499 << CSM << MD->getParent() << /*IsField*/true
4500 << Field << DiagKind << IsDtorCallInCtor;
4502 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>();
4503 S.Diag(Base->getLocStart(),
4504 diag::note_deleted_special_member_class_subobject)
4505 << CSM << MD->getParent() << /*IsField*/false
4506 << Base->getType() << DiagKind << IsDtorCallInCtor;
4510 S.NoteDeletedFunction(Decl);
4511 // FIXME: Explain inaccessibility if DiagKind == 3.
4517 /// Check whether we should delete a special member function due to having a
4518 /// direct or virtual base class or non-static data member of class type M.
4519 bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject(
4520 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) {
4521 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
4523 // C++11 [class.ctor]p5:
4524 // -- any direct or virtual base class, or non-static data member with no
4525 // brace-or-equal-initializer, has class type M (or array thereof) and
4526 // either M has no default constructor or overload resolution as applied
4527 // to M's default constructor results in an ambiguity or in a function
4528 // that is deleted or inaccessible
4529 // C++11 [class.copy]p11, C++11 [class.copy]p23:
4530 // -- a direct or virtual base class B that cannot be copied/moved because
4531 // overload resolution, as applied to B's corresponding special member,
4532 // results in an ambiguity or a function that is deleted or inaccessible
4533 // from the defaulted special member
4534 // C++11 [class.dtor]p5:
4535 // -- any direct or virtual base class [...] has a type with a destructor
4536 // that is deleted or inaccessible
4537 if (!(CSM == Sema::CXXDefaultConstructor &&
4538 Field && Field->hasInClassInitializer()) &&
4539 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false))
4542 // C++11 [class.ctor]p5, C++11 [class.copy]p11:
4543 // -- any direct or virtual base class or non-static data member has a
4544 // type with a destructor that is deleted or inaccessible
4545 if (IsConstructor) {
4546 Sema::SpecialMemberOverloadResult *SMOR =
4547 S.LookupSpecialMember(Class, Sema::CXXDestructor,
4548 false, false, false, false, false);
4549 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true))
4556 /// Check whether we should delete a special member function due to the class
4557 /// having a particular direct or virtual base class.
4558 bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) {
4559 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl();
4560 return shouldDeleteForClassSubobject(BaseClass, Base, 0);
4563 /// Check whether we should delete a special member function due to the class
4564 /// having a particular non-static data member.
4565 bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) {
4566 QualType FieldType = S.Context.getBaseElementType(FD->getType());
4567 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl();
4569 if (CSM == Sema::CXXDefaultConstructor) {
4570 // For a default constructor, all references must be initialized in-class
4571 // and, if a union, it must have a non-const member.
4572 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) {
4574 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
4575 << MD->getParent() << FD << FieldType << /*Reference*/0;
4578 // C++11 [class.ctor]p5: any non-variant non-static data member of
4579 // const-qualified type (or array thereof) with no
4580 // brace-or-equal-initializer does not have a user-provided default
4582 if (!inUnion() && FieldType.isConstQualified() &&
4583 !FD->hasInClassInitializer() &&
4584 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) {
4586 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
4587 << MD->getParent() << FD << FD->getType() << /*Const*/1;
4591 if (inUnion() && !FieldType.isConstQualified())
4592 AllFieldsAreConst = false;
4593 } else if (CSM == Sema::CXXCopyConstructor) {
4594 // For a copy constructor, data members must not be of rvalue reference
4596 if (FieldType->isRValueReferenceType()) {
4598 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference)
4599 << MD->getParent() << FD << FieldType;
4602 } else if (IsAssignment) {
4603 // For an assignment operator, data members must not be of reference type.
4604 if (FieldType->isReferenceType()) {
4606 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
4607 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0;
4610 if (!FieldRecord && FieldType.isConstQualified()) {
4611 // C++11 [class.copy]p23:
4612 // -- a non-static data member of const non-class type (or array thereof)
4614 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
4615 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1;
4621 // Some additional restrictions exist on the variant members.
4622 if (!inUnion() && FieldRecord->isUnion() &&
4623 FieldRecord->isAnonymousStructOrUnion()) {
4624 bool AllVariantFieldsAreConst = true;
4626 // FIXME: Handle anonymous unions declared within anonymous unions.
4627 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(),
4628 UE = FieldRecord->field_end();
4630 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType());
4632 if (!UnionFieldType.isConstQualified())
4633 AllVariantFieldsAreConst = false;
4635 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl();
4636 if (UnionFieldRecord &&
4637 shouldDeleteForClassSubobject(UnionFieldRecord, *UI,
4638 UnionFieldType.getCVRQualifiers()))
4642 // At least one member in each anonymous union must be non-const
4643 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst &&
4644 FieldRecord->field_begin() != FieldRecord->field_end()) {
4646 S.Diag(FieldRecord->getLocation(),
4647 diag::note_deleted_default_ctor_all_const)
4648 << MD->getParent() << /*anonymous union*/1;
4652 // Don't check the implicit member of the anonymous union type.
4653 // This is technically non-conformant, but sanity demands it.
4657 if (shouldDeleteForClassSubobject(FieldRecord, FD,
4658 FieldType.getCVRQualifiers()))
4665 /// C++11 [class.ctor] p5:
4666 /// A defaulted default constructor for a class X is defined as deleted if
4667 /// X is a union and all of its variant members are of const-qualified type.
4668 bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() {
4669 // This is a silly definition, because it gives an empty union a deleted
4670 // default constructor. Don't do that.
4671 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst &&
4672 (MD->getParent()->field_begin() != MD->getParent()->field_end())) {
4674 S.Diag(MD->getParent()->getLocation(),
4675 diag::note_deleted_default_ctor_all_const)
4676 << MD->getParent() << /*not anonymous union*/0;
4682 /// Determine whether a defaulted special member function should be defined as
4683 /// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11,
4684 /// C++11 [class.copy]p23, and C++11 [class.dtor]p5.
4685 bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM,
4687 if (MD->isInvalidDecl())
4689 CXXRecordDecl *RD = MD->getParent();
4690 assert(!RD->isDependentType() && "do deletion after instantiation");
4691 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl())
4694 // C++11 [expr.lambda.prim]p19:
4695 // The closure type associated with a lambda-expression has a
4696 // deleted (8.4.3) default constructor and a deleted copy
4697 // assignment operator.
4698 if (RD->isLambda() &&
4699 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) {
4701 Diag(RD->getLocation(), diag::note_lambda_decl);
4705 // For an anonymous struct or union, the copy and assignment special members
4706 // will never be used, so skip the check. For an anonymous union declared at
4707 // namespace scope, the constructor and destructor are used.
4708 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor &&
4709 RD->isAnonymousStructOrUnion())
4712 // C++11 [class.copy]p7, p18:
4713 // If the class definition declares a move constructor or move assignment
4714 // operator, an implicitly declared copy constructor or copy assignment
4715 // operator is defined as deleted.
4716 if (MD->isImplicit() &&
4717 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) {
4718 CXXMethodDecl *UserDeclaredMove = 0;
4720 // In Microsoft mode, a user-declared move only causes the deletion of the
4721 // corresponding copy operation, not both copy operations.
4722 if (RD->hasUserDeclaredMoveConstructor() &&
4723 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) {
4724 if (!Diagnose) return true;
4725 UserDeclaredMove = RD->getMoveConstructor();
4726 assert(UserDeclaredMove);
4727 } else if (RD->hasUserDeclaredMoveAssignment() &&
4728 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) {
4729 if (!Diagnose) return true;
4730 UserDeclaredMove = RD->getMoveAssignmentOperator();
4731 assert(UserDeclaredMove);
4734 if (UserDeclaredMove) {
4735 Diag(UserDeclaredMove->getLocation(),
4736 diag::note_deleted_copy_user_declared_move)
4737 << (CSM == CXXCopyAssignment) << RD
4738 << UserDeclaredMove->isMoveAssignmentOperator();
4743 // Do access control from the special member function
4744 ContextRAII MethodContext(*this, MD);
4746 // C++11 [class.dtor]p5:
4747 // -- for a virtual destructor, lookup of the non-array deallocation function
4748 // results in an ambiguity or in a function that is deleted or inaccessible
4749 if (CSM == CXXDestructor && MD->isVirtual()) {
4750 FunctionDecl *OperatorDelete = 0;
4751 DeclarationName Name =
4752 Context.DeclarationNames.getCXXOperatorName(OO_Delete);
4753 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name,
4754 OperatorDelete, false)) {
4756 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete);
4761 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose);
4763 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(),
4764 BE = RD->bases_end(); BI != BE; ++BI)
4765 if (!BI->isVirtual() &&
4766 SMI.shouldDeleteForBase(BI))
4769 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(),
4770 BE = RD->vbases_end(); BI != BE; ++BI)
4771 if (SMI.shouldDeleteForBase(BI))
4774 for (CXXRecordDecl::field_iterator FI = RD->field_begin(),
4775 FE = RD->field_end(); FI != FE; ++FI)
4776 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() &&
4777 SMI.shouldDeleteForField(*FI))
4780 if (SMI.shouldDeleteForAllConstMembers())
4786 /// \brief Data used with FindHiddenVirtualMethod
4788 struct FindHiddenVirtualMethodData {
4790 CXXMethodDecl *Method;
4791 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods;
4792 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
4796 /// \brief Check whether any most overriden method from MD in Methods
4797 static bool CheckMostOverridenMethods(const CXXMethodDecl *MD,
4798 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) {
4799 if (MD->size_overridden_methods() == 0)
4800 return Methods.count(MD->getCanonicalDecl());
4801 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
4802 E = MD->end_overridden_methods();
4804 if (CheckMostOverridenMethods(*I, Methods))
4809 /// \brief Member lookup function that determines whether a given C++
4810 /// method overloads virtual methods in a base class without overriding any,
4811 /// to be used with CXXRecordDecl::lookupInBases().
4812 static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier,
4815 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
4817 FindHiddenVirtualMethodData &Data
4818 = *static_cast<FindHiddenVirtualMethodData*>(UserData);
4820 DeclarationName Name = Data.Method->getDeclName();
4821 assert(Name.getNameKind() == DeclarationName::Identifier);
4823 bool foundSameNameMethod = false;
4824 SmallVector<CXXMethodDecl *, 8> overloadedMethods;
4825 for (Path.Decls = BaseRecord->lookup(Name);
4826 Path.Decls.first != Path.Decls.second;
4827 ++Path.Decls.first) {
4828 NamedDecl *D = *Path.Decls.first;
4829 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
4830 MD = MD->getCanonicalDecl();
4831 foundSameNameMethod = true;
4832 // Interested only in hidden virtual methods.
4833 if (!MD->isVirtual())
4835 // If the method we are checking overrides a method from its base
4836 // don't warn about the other overloaded methods.
4837 if (!Data.S->IsOverload(Data.Method, MD, false))
4839 // Collect the overload only if its hidden.
4840 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods))
4841 overloadedMethods.push_back(MD);
4845 if (foundSameNameMethod)
4846 Data.OverloadedMethods.append(overloadedMethods.begin(),
4847 overloadedMethods.end());
4848 return foundSameNameMethod;
4851 /// \brief Add the most overriden methods from MD to Methods
4852 static void AddMostOverridenMethods(const CXXMethodDecl *MD,
4853 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) {
4854 if (MD->size_overridden_methods() == 0)
4855 Methods.insert(MD->getCanonicalDecl());
4856 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
4857 E = MD->end_overridden_methods();
4859 AddMostOverridenMethods(*I, Methods);
4862 /// \brief See if a method overloads virtual methods in a base class without
4864 void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
4865 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual,
4866 MD->getLocation()) == DiagnosticsEngine::Ignored)
4868 if (!MD->getDeclName().isIdentifier())
4871 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases.
4872 /*bool RecordPaths=*/false,
4873 /*bool DetectVirtual=*/false);
4874 FindHiddenVirtualMethodData Data;
4878 // Keep the base methods that were overriden or introduced in the subclass
4879 // by 'using' in a set. A base method not in this set is hidden.
4880 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName());
4881 res.first != res.second; ++res.first) {
4882 NamedDecl *ND = *res.first;
4883 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first))
4884 ND = shad->getTargetDecl();
4885 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
4886 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods);
4889 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) &&
4890 !Data.OverloadedMethods.empty()) {
4891 Diag(MD->getLocation(), diag::warn_overloaded_virtual)
4892 << MD << (Data.OverloadedMethods.size() > 1);
4894 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) {
4895 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i];
4896 Diag(overloadedMD->getLocation(),
4897 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD;
4902 void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
4904 SourceLocation LBrac,
4905 SourceLocation RBrac,
4906 AttributeList *AttrList) {
4910 AdjustDeclIfTemplate(TagDecl);
4912 for (const AttributeList* l = AttrList; l; l = l->getNext()) {
4913 if (l->getKind() != AttributeList::AT_Visibility)
4916 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) <<
4920 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef(
4921 // strict aliasing violation!
4922 reinterpret_cast<Decl**>(FieldCollector->getCurFields()),
4923 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList);
4925 CheckCompletedCXXClass(
4926 dyn_cast_or_null<CXXRecordDecl>(TagDecl));
4929 /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
4930 /// special functions, such as the default constructor, copy
4931 /// constructor, or destructor, to the given C++ class (C++
4932 /// [special]p1). This routine can only be executed just before the
4933 /// definition of the class is complete.
4934 void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
4935 if (!ClassDecl->hasUserDeclaredConstructor())
4936 ++ASTContext::NumImplicitDefaultConstructors;
4938 if (!ClassDecl->hasUserDeclaredCopyConstructor())
4939 ++ASTContext::NumImplicitCopyConstructors;
4941 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor())
4942 ++ASTContext::NumImplicitMoveConstructors;
4944 if (!ClassDecl->hasUserDeclaredCopyAssignment()) {
4945 ++ASTContext::NumImplicitCopyAssignmentOperators;
4947 // If we have a dynamic class, then the copy assignment operator may be
4948 // virtual, so we have to declare it immediately. This ensures that, e.g.,
4949 // it shows up in the right place in the vtable and that we diagnose
4950 // problems with the implicit exception specification.
4951 if (ClassDecl->isDynamicClass())
4952 DeclareImplicitCopyAssignment(ClassDecl);
4955 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) {
4956 ++ASTContext::NumImplicitMoveAssignmentOperators;
4958 // Likewise for the move assignment operator.
4959 if (ClassDecl->isDynamicClass())
4960 DeclareImplicitMoveAssignment(ClassDecl);
4963 if (!ClassDecl->hasUserDeclaredDestructor()) {
4964 ++ASTContext::NumImplicitDestructors;
4966 // If we have a dynamic class, then the destructor may be virtual, so we
4967 // have to declare the destructor immediately. This ensures that, e.g., it
4968 // shows up in the right place in the vtable and that we diagnose problems
4969 // with the implicit exception specification.
4970 if (ClassDecl->isDynamicClass())
4971 DeclareImplicitDestructor(ClassDecl);
4975 void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) {
4979 int NumParamList = D->getNumTemplateParameterLists();
4980 for (int i = 0; i < NumParamList; i++) {
4981 TemplateParameterList* Params = D->getTemplateParameterList(i);
4982 for (TemplateParameterList::iterator Param = Params->begin(),
4983 ParamEnd = Params->end();
4984 Param != ParamEnd; ++Param) {
4985 NamedDecl *Named = cast<NamedDecl>(*Param);
4986 if (Named->getDeclName()) {
4988 IdResolver.AddDecl(Named);
4994 void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) {
4998 TemplateParameterList *Params = 0;
4999 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D))
5000 Params = Template->getTemplateParameters();
5001 else if (ClassTemplatePartialSpecializationDecl *PartialSpec
5002 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
5003 Params = PartialSpec->getTemplateParameters();
5007 for (TemplateParameterList::iterator Param = Params->begin(),
5008 ParamEnd = Params->end();
5009 Param != ParamEnd; ++Param) {
5010 NamedDecl *Named = cast<NamedDecl>(*Param);
5011 if (Named->getDeclName()) {
5013 IdResolver.AddDecl(Named);
5018 void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
5019 if (!RecordD) return;
5020 AdjustDeclIfTemplate(RecordD);
5021 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD);
5022 PushDeclContext(S, Record);
5025 void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
5026 if (!RecordD) return;
5030 /// ActOnStartDelayedCXXMethodDeclaration - We have completed
5031 /// parsing a top-level (non-nested) C++ class, and we are now
5032 /// parsing those parts of the given Method declaration that could
5033 /// not be parsed earlier (C++ [class.mem]p2), such as default
5034 /// arguments. This action should enter the scope of the given
5035 /// Method declaration as if we had just parsed the qualified method
5036 /// name. However, it should not bring the parameters into scope;
5037 /// that will be performed by ActOnDelayedCXXMethodParameter.
5038 void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
5041 /// ActOnDelayedCXXMethodParameter - We've already started a delayed
5042 /// C++ method declaration. We're (re-)introducing the given
5043 /// function parameter into scope for use in parsing later parts of
5044 /// the method declaration. For example, we could see an
5045 /// ActOnParamDefaultArgument event for this parameter.
5046 void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) {
5050 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD);
5052 // If this parameter has an unparsed default argument, clear it out
5053 // to make way for the parsed default argument.
5054 if (Param->hasUnparsedDefaultArg())
5055 Param->setDefaultArg(0);
5058 if (Param->getDeclName())
5059 IdResolver.AddDecl(Param);
5062 /// ActOnFinishDelayedCXXMethodDeclaration - We have finished
5063 /// processing the delayed method declaration for Method. The method
5064 /// declaration is now considered finished. There may be a separate
5065 /// ActOnStartOfFunctionDef action later (not necessarily
5066 /// immediately!) for this method, if it was also defined inside the
5068 void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
5072 AdjustDeclIfTemplate(MethodD);
5074 FunctionDecl *Method = cast<FunctionDecl>(MethodD);
5076 // Now that we have our default arguments, check the constructor
5077 // again. It could produce additional diagnostics or affect whether
5078 // the class has implicitly-declared destructors, among other
5080 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method))
5081 CheckConstructor(Constructor);
5083 // Check the default arguments, which we may have added.
5084 if (!Method->isInvalidDecl())
5085 CheckCXXDefaultArguments(Method);
5088 /// CheckConstructorDeclarator - Called by ActOnDeclarator to check
5089 /// the well-formedness of the constructor declarator @p D with type @p
5090 /// R. If there are any errors in the declarator, this routine will
5091 /// emit diagnostics and set the invalid bit to true. In any case, the type
5092 /// will be updated to reflect a well-formed type for the constructor and
5094 QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R,
5096 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
5098 // C++ [class.ctor]p3:
5099 // A constructor shall not be virtual (10.3) or static (9.4). A
5100 // constructor can be invoked for a const, volatile or const
5101 // volatile object. A constructor shall not be declared const,
5102 // volatile, or const volatile (9.3.2).
5104 if (!D.isInvalidType())
5105 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
5106 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc())
5107 << SourceRange(D.getIdentifierLoc());
5110 if (SC == SC_Static) {
5111 if (!D.isInvalidType())
5112 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
5113 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
5114 << SourceRange(D.getIdentifierLoc());
5119 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
5120 if (FTI.TypeQuals != 0) {
5121 if (FTI.TypeQuals & Qualifiers::Const)
5122 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
5123 << "const" << SourceRange(D.getIdentifierLoc());
5124 if (FTI.TypeQuals & Qualifiers::Volatile)
5125 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
5126 << "volatile" << SourceRange(D.getIdentifierLoc());
5127 if (FTI.TypeQuals & Qualifiers::Restrict)
5128 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
5129 << "restrict" << SourceRange(D.getIdentifierLoc());
5133 // C++0x [class.ctor]p4:
5134 // A constructor shall not be declared with a ref-qualifier.
5135 if (FTI.hasRefQualifier()) {
5136 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor)
5137 << FTI.RefQualifierIsLValueRef
5138 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
5142 // Rebuild the function type "R" without any type qualifiers (in
5143 // case any of the errors above fired) and with "void" as the
5144 // return type, since constructors don't have return types.
5145 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
5146 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType())
5149 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
5151 EPI.RefQualifier = RQ_None;
5153 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(),
5154 Proto->getNumArgs(), EPI);
5157 /// CheckConstructor - Checks a fully-formed constructor for
5158 /// well-formedness, issuing any diagnostics required. Returns true if
5159 /// the constructor declarator is invalid.
5160 void Sema::CheckConstructor(CXXConstructorDecl *Constructor) {
5161 CXXRecordDecl *ClassDecl
5162 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext());
5164 return Constructor->setInvalidDecl();
5166 // C++ [class.copy]p3:
5167 // A declaration of a constructor for a class X is ill-formed if
5168 // its first parameter is of type (optionally cv-qualified) X and
5169 // either there are no other parameters or else all other
5170 // parameters have default arguments.
5171 if (!Constructor->isInvalidDecl() &&
5172 ((Constructor->getNumParams() == 1) ||
5173 (Constructor->getNumParams() > 1 &&
5174 Constructor->getParamDecl(1)->hasDefaultArg())) &&
5175 Constructor->getTemplateSpecializationKind()
5176 != TSK_ImplicitInstantiation) {
5177 QualType ParamType = Constructor->getParamDecl(0)->getType();
5178 QualType ClassTy = Context.getTagDeclType(ClassDecl);
5179 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) {
5180 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation();
5181 const char *ConstRef
5182 = Constructor->getParamDecl(0)->getIdentifier() ? "const &"
5184 Diag(ParamLoc, diag::err_constructor_byvalue_arg)
5185 << FixItHint::CreateInsertion(ParamLoc, ConstRef);
5187 // FIXME: Rather that making the constructor invalid, we should endeavor
5189 Constructor->setInvalidDecl();
5194 /// CheckDestructor - Checks a fully-formed destructor definition for
5195 /// well-formedness, issuing any diagnostics required. Returns true
5197 bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) {
5198 CXXRecordDecl *RD = Destructor->getParent();
5200 if (Destructor->isVirtual()) {
5203 if (!Destructor->isImplicit())
5204 Loc = Destructor->getLocation();
5206 Loc = RD->getLocation();
5208 // If we have a virtual destructor, look up the deallocation function
5209 FunctionDecl *OperatorDelete = 0;
5210 DeclarationName Name =
5211 Context.DeclarationNames.getCXXOperatorName(OO_Delete);
5212 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete))
5215 MarkFunctionReferenced(Loc, OperatorDelete);
5217 Destructor->setOperatorDelete(OperatorDelete);
5224 FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) {
5225 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
5226 FTI.ArgInfo[0].Param &&
5227 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType());
5230 /// CheckDestructorDeclarator - Called by ActOnDeclarator to check
5231 /// the well-formednes of the destructor declarator @p D with type @p
5232 /// R. If there are any errors in the declarator, this routine will
5233 /// emit diagnostics and set the declarator to invalid. Even if this happens,
5234 /// will be updated to reflect a well-formed type for the destructor and
5236 QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R,
5238 // C++ [class.dtor]p1:
5239 // [...] A typedef-name that names a class is a class-name
5240 // (7.1.3); however, a typedef-name that names a class shall not
5241 // be used as the identifier in the declarator for a destructor
5243 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName);
5244 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>())
5245 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
5246 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl());
5247 else if (const TemplateSpecializationType *TST =
5248 DeclaratorType->getAs<TemplateSpecializationType>())
5249 if (TST->isTypeAlias())
5250 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
5251 << DeclaratorType << 1;
5253 // C++ [class.dtor]p2:
5254 // A destructor is used to destroy objects of its class type. A
5255 // destructor takes no parameters, and no return type can be
5256 // specified for it (not even void). The address of a destructor
5257 // shall not be taken. A destructor shall not be static. A
5258 // destructor can be invoked for a const, volatile or const
5259 // volatile object. A destructor shall not be declared const,
5260 // volatile or const volatile (9.3.2).
5261 if (SC == SC_Static) {
5262 if (!D.isInvalidType())
5263 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be)
5264 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
5265 << SourceRange(D.getIdentifierLoc())
5266 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
5270 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
5271 // Destructors don't have return types, but the parser will
5272 // happily parse something like:
5278 // The return type will be eliminated later.
5279 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type)
5280 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
5281 << SourceRange(D.getIdentifierLoc());
5284 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
5285 if (FTI.TypeQuals != 0 && !D.isInvalidType()) {
5286 if (FTI.TypeQuals & Qualifiers::Const)
5287 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
5288 << "const" << SourceRange(D.getIdentifierLoc());
5289 if (FTI.TypeQuals & Qualifiers::Volatile)
5290 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
5291 << "volatile" << SourceRange(D.getIdentifierLoc());
5292 if (FTI.TypeQuals & Qualifiers::Restrict)
5293 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
5294 << "restrict" << SourceRange(D.getIdentifierLoc());
5298 // C++0x [class.dtor]p2:
5299 // A destructor shall not be declared with a ref-qualifier.
5300 if (FTI.hasRefQualifier()) {
5301 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor)
5302 << FTI.RefQualifierIsLValueRef
5303 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
5307 // Make sure we don't have any parameters.
5308 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) {
5309 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params);
5311 // Delete the parameters.
5316 // Make sure the destructor isn't variadic.
5317 if (FTI.isVariadic) {
5318 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic);
5322 // Rebuild the function type "R" without any type qualifiers or
5323 // parameters (in case any of the errors above fired) and with
5324 // "void" as the return type, since destructors don't have return
5326 if (!D.isInvalidType())
5329 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
5330 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
5331 EPI.Variadic = false;
5333 EPI.RefQualifier = RQ_None;
5334 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI);
5337 /// CheckConversionDeclarator - Called by ActOnDeclarator to check the
5338 /// well-formednes of the conversion function declarator @p D with
5339 /// type @p R. If there are any errors in the declarator, this routine
5340 /// will emit diagnostics and return true. Otherwise, it will return
5341 /// false. Either way, the type @p R will be updated to reflect a
5342 /// well-formed type for the conversion operator.
5343 void Sema::CheckConversionDeclarator(Declarator &D, QualType &R,
5345 // C++ [class.conv.fct]p1:
5346 // Neither parameter types nor return type can be specified. The
5347 // type of a conversion function (8.3.5) is "function taking no
5348 // parameter returning conversion-type-id."
5349 if (SC == SC_Static) {
5350 if (!D.isInvalidType())
5351 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member)
5352 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
5353 << SourceRange(D.getIdentifierLoc());
5358 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId);
5360 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
5361 // Conversion functions don't have return types, but the parser will
5362 // happily parse something like:
5365 // float operator bool();
5368 // The return type will be changed later anyway.
5369 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type)
5370 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
5371 << SourceRange(D.getIdentifierLoc());
5375 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
5377 // Make sure we don't have any parameters.
5378 if (Proto->getNumArgs() > 0) {
5379 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params);
5381 // Delete the parameters.
5382 D.getFunctionTypeInfo().freeArgs();
5384 } else if (Proto->isVariadic()) {
5385 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic);
5389 // Diagnose "&operator bool()" and other such nonsense. This
5390 // is actually a gcc extension which we don't support.
5391 if (Proto->getResultType() != ConvType) {
5392 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl)
5393 << Proto->getResultType();
5395 ConvType = Proto->getResultType();
5398 // C++ [class.conv.fct]p4:
5399 // The conversion-type-id shall not represent a function type nor
5401 if (ConvType->isArrayType()) {
5402 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array);
5403 ConvType = Context.getPointerType(ConvType);
5405 } else if (ConvType->isFunctionType()) {
5406 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function);
5407 ConvType = Context.getPointerType(ConvType);
5411 // Rebuild the function type "R" without any parameters (in case any
5412 // of the errors above fired) and with the conversion type as the
5414 if (D.isInvalidType())
5415 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo());
5417 // C++0x explicit conversion operators.
5418 if (D.getDeclSpec().isExplicitSpecified())
5419 Diag(D.getDeclSpec().getExplicitSpecLoc(),
5420 getLangOpts().CPlusPlus0x ?
5421 diag::warn_cxx98_compat_explicit_conversion_functions :
5422 diag::ext_explicit_conversion_functions)
5423 << SourceRange(D.getDeclSpec().getExplicitSpecLoc());
5426 /// ActOnConversionDeclarator - Called by ActOnDeclarator to complete
5427 /// the declaration of the given C++ conversion function. This routine
5428 /// is responsible for recording the conversion function in the C++
5429 /// class, if possible.
5430 Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) {
5431 assert(Conversion && "Expected to receive a conversion function declaration");
5433 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext());
5435 // Make sure we aren't redeclaring the conversion function.
5436 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType());
5438 // C++ [class.conv.fct]p1:
5439 // [...] A conversion function is never used to convert a
5440 // (possibly cv-qualified) object to the (possibly cv-qualified)
5441 // same object type (or a reference to it), to a (possibly
5442 // cv-qualified) base class of that type (or a reference to it),
5443 // or to (possibly cv-qualified) void.
5444 // FIXME: Suppress this warning if the conversion function ends up being a
5445 // virtual function that overrides a virtual function in a base class.
5447 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
5448 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>())
5449 ConvType = ConvTypeRef->getPointeeType();
5450 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared &&
5451 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization)
5452 /* Suppress diagnostics for instantiations. */;
5453 else if (ConvType->isRecordType()) {
5454 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType();
5455 if (ConvType == ClassType)
5456 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used)
5458 else if (IsDerivedFrom(ClassType, ConvType))
5459 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used)
5460 << ClassType << ConvType;
5461 } else if (ConvType->isVoidType()) {
5462 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used)
5463 << ClassType << ConvType;
5466 if (FunctionTemplateDecl *ConversionTemplate
5467 = Conversion->getDescribedFunctionTemplate())
5468 return ConversionTemplate;
5473 //===----------------------------------------------------------------------===//
5474 // Namespace Handling
5475 //===----------------------------------------------------------------------===//
5477 /// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is
5479 static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc,
5481 IdentifierInfo *II, bool *IsInline,
5482 NamespaceDecl *PrevNS) {
5483 assert(*IsInline != PrevNS->isInline());
5485 // HACK: Work around a bug in libstdc++4.6's <atomic>, where
5486 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as
5487 // inline namespaces, with the intention of bringing names into namespace std.
5489 // We support this just well enough to get that case working; this is not
5490 // sufficient to support reopening namespaces as inline in general.
5491 if (*IsInline && II && II->getName().startswith("__atomic") &&
5492 S.getSourceManager().isInSystemHeader(Loc)) {
5493 // Mark all prior declarations of the namespace as inline.
5494 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS;
5495 NS = NS->getPreviousDecl())
5496 NS->setInline(*IsInline);
5497 // Patch up the lookup table for the containing namespace. This isn't really
5498 // correct, but it's good enough for this particular case.
5499 for (DeclContext::decl_iterator I = PrevNS->decls_begin(),
5500 E = PrevNS->decls_end(); I != E; ++I)
5501 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I))
5502 PrevNS->getParent()->makeDeclVisibleInContext(ND);
5506 if (PrevNS->isInline())
5507 // The user probably just forgot the 'inline', so suggest that it
5509 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline)
5510 << FixItHint::CreateInsertion(KeywordLoc, "inline ");
5512 S.Diag(Loc, diag::err_inline_namespace_mismatch)
5515 S.Diag(PrevNS->getLocation(), diag::note_previous_definition);
5516 *IsInline = PrevNS->isInline();
5519 /// ActOnStartNamespaceDef - This is called at the start of a namespace
5521 Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope,
5522 SourceLocation InlineLoc,
5523 SourceLocation NamespaceLoc,
5524 SourceLocation IdentLoc,
5526 SourceLocation LBrace,
5527 AttributeList *AttrList) {
5528 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc;
5529 // For anonymous namespace, take the location of the left brace.
5530 SourceLocation Loc = II ? IdentLoc : LBrace;
5531 bool IsInline = InlineLoc.isValid();
5532 bool IsInvalid = false;
5534 bool AddToKnown = false;
5535 Scope *DeclRegionScope = NamespcScope->getParent();
5537 NamespaceDecl *PrevNS = 0;
5539 // C++ [namespace.def]p2:
5540 // The identifier in an original-namespace-definition shall not
5541 // have been previously defined in the declarative region in
5542 // which the original-namespace-definition appears. The
5543 // identifier in an original-namespace-definition is the name of
5544 // the namespace. Subsequently in that declarative region, it is
5545 // treated as an original-namespace-name.
5547 // Since namespace names are unique in their scope, and we don't
5548 // look through using directives, just look for any ordinary names.
5550 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member |
5551 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag |
5552 Decl::IDNS_Namespace;
5553 NamedDecl *PrevDecl = 0;
5554 for (DeclContext::lookup_result R
5555 = CurContext->getRedeclContext()->lookup(II);
5556 R.first != R.second; ++R.first) {
5557 if ((*R.first)->getIdentifierNamespace() & IDNS) {
5558 PrevDecl = *R.first;
5563 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl);
5566 // This is an extended namespace definition.
5567 if (IsInline != PrevNS->isInline())
5568 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II,
5570 } else if (PrevDecl) {
5571 // This is an invalid name redefinition.
5572 Diag(Loc, diag::err_redefinition_different_kind)
5574 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
5576 // Continue on to push Namespc as current DeclContext and return it.
5577 } else if (II->isStr("std") &&
5578 CurContext->getRedeclContext()->isTranslationUnit()) {
5579 // This is the first "real" definition of the namespace "std", so update
5580 // our cache of the "std" namespace to point at this definition.
5581 PrevNS = getStdNamespace();
5583 AddToKnown = !IsInline;
5585 // We've seen this namespace for the first time.
5586 AddToKnown = !IsInline;
5589 // Anonymous namespaces.
5591 // Determine whether the parent already has an anonymous namespace.
5592 DeclContext *Parent = CurContext->getRedeclContext();
5593 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
5594 PrevNS = TU->getAnonymousNamespace();
5596 NamespaceDecl *ND = cast<NamespaceDecl>(Parent);
5597 PrevNS = ND->getAnonymousNamespace();
5600 if (PrevNS && IsInline != PrevNS->isInline())
5601 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II,
5605 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline,
5606 StartLoc, Loc, II, PrevNS);
5608 Namespc->setInvalidDecl();
5610 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList);
5612 // FIXME: Should we be merging attributes?
5613 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>())
5614 PushNamespaceVisibilityAttr(Attr, Loc);
5617 StdNamespace = Namespc;
5619 KnownNamespaces[Namespc] = false;
5622 PushOnScopeChains(Namespc, DeclRegionScope);
5624 // Link the anonymous namespace into its parent.
5625 DeclContext *Parent = CurContext->getRedeclContext();
5626 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
5627 TU->setAnonymousNamespace(Namespc);
5629 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc);
5632 CurContext->addDecl(Namespc);
5634 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition
5635 // behaves as if it were replaced by
5636 // namespace unique { /* empty body */ }
5637 // using namespace unique;
5638 // namespace unique { namespace-body }
5639 // where all occurrences of 'unique' in a translation unit are
5640 // replaced by the same identifier and this identifier differs
5641 // from all other identifiers in the entire program.
5643 // We just create the namespace with an empty name and then add an
5644 // implicit using declaration, just like the standard suggests.
5646 // CodeGen enforces the "universally unique" aspect by giving all
5647 // declarations semantically contained within an anonymous
5648 // namespace internal linkage.
5651 UsingDirectiveDecl* UD
5652 = UsingDirectiveDecl::Create(Context, Parent,
5653 /* 'using' */ LBrace,
5654 /* 'namespace' */ SourceLocation(),
5655 /* qualifier */ NestedNameSpecifierLoc(),
5656 /* identifier */ SourceLocation(),
5658 /* Ancestor */ Parent);
5660 Parent->addDecl(UD);
5664 ActOnDocumentableDecl(Namespc);
5666 // Although we could have an invalid decl (i.e. the namespace name is a
5667 // redefinition), push it as current DeclContext and try to continue parsing.
5668 // FIXME: We should be able to push Namespc here, so that the each DeclContext
5669 // for the namespace has the declarations that showed up in that particular
5670 // namespace definition.
5671 PushDeclContext(NamespcScope, Namespc);
5675 /// getNamespaceDecl - Returns the namespace a decl represents. If the decl
5676 /// is a namespace alias, returns the namespace it points to.
5677 static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) {
5678 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D))
5679 return AD->getNamespace();
5680 return dyn_cast_or_null<NamespaceDecl>(D);
5683 /// ActOnFinishNamespaceDef - This callback is called after a namespace is
5684 /// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef.
5685 void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) {
5686 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl);
5687 assert(Namespc && "Invalid parameter, expected NamespaceDecl");
5688 Namespc->setRBraceLoc(RBrace);
5690 if (Namespc->hasAttr<VisibilityAttr>())
5691 PopPragmaVisibility(true, RBrace);
5694 CXXRecordDecl *Sema::getStdBadAlloc() const {
5695 return cast_or_null<CXXRecordDecl>(
5696 StdBadAlloc.get(Context.getExternalSource()));
5699 NamespaceDecl *Sema::getStdNamespace() const {
5700 return cast_or_null<NamespaceDecl>(
5701 StdNamespace.get(Context.getExternalSource()));
5704 /// \brief Retrieve the special "std" namespace, which may require us to
5705 /// implicitly define the namespace.
5706 NamespaceDecl *Sema::getOrCreateStdNamespace() {
5707 if (!StdNamespace) {
5708 // The "std" namespace has not yet been defined, so build one implicitly.
5709 StdNamespace = NamespaceDecl::Create(Context,
5710 Context.getTranslationUnitDecl(),
5712 SourceLocation(), SourceLocation(),
5713 &PP.getIdentifierTable().get("std"),
5715 getStdNamespace()->setImplicit(true);
5718 return getStdNamespace();
5721 bool Sema::isStdInitializerList(QualType Ty, QualType *Element) {
5722 assert(getLangOpts().CPlusPlus &&
5723 "Looking for std::initializer_list outside of C++.");
5725 // We're looking for implicit instantiations of
5726 // template <typename E> class std::initializer_list.
5728 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it.
5731 ClassTemplateDecl *Template = 0;
5732 const TemplateArgument *Arguments = 0;
5734 if (const RecordType *RT = Ty->getAs<RecordType>()) {
5736 ClassTemplateSpecializationDecl *Specialization =
5737 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl());
5738 if (!Specialization)
5741 Template = Specialization->getSpecializedTemplate();
5742 Arguments = Specialization->getTemplateArgs().data();
5743 } else if (const TemplateSpecializationType *TST =
5744 Ty->getAs<TemplateSpecializationType>()) {
5745 Template = dyn_cast_or_null<ClassTemplateDecl>(
5746 TST->getTemplateName().getAsTemplateDecl());
5747 Arguments = TST->getArgs();
5752 if (!StdInitializerList) {
5753 // Haven't recognized std::initializer_list yet, maybe this is it.
5754 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl();
5755 if (TemplateClass->getIdentifier() !=
5756 &PP.getIdentifierTable().get("initializer_list") ||
5757 !getStdNamespace()->InEnclosingNamespaceSetOf(
5758 TemplateClass->getDeclContext()))
5760 // This is a template called std::initializer_list, but is it the right
5762 TemplateParameterList *Params = Template->getTemplateParameters();
5763 if (Params->getMinRequiredArguments() != 1)
5765 if (!isa<TemplateTypeParmDecl>(Params->getParam(0)))
5768 // It's the right template.
5769 StdInitializerList = Template;
5772 if (Template != StdInitializerList)
5775 // This is an instance of std::initializer_list. Find the argument type.
5777 *Element = Arguments[0].getAsType();
5781 static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){
5782 NamespaceDecl *Std = S.getStdNamespace();
5784 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
5788 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"),
5789 Loc, Sema::LookupOrdinaryName);
5790 if (!S.LookupQualifiedName(Result, Std)) {
5791 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
5794 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>();
5796 Result.suppressDiagnostics();
5797 // We found something weird. Complain about the first thing we found.
5798 NamedDecl *Found = *Result.begin();
5799 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list);
5803 // We found some template called std::initializer_list. Now verify that it's
5805 TemplateParameterList *Params = Template->getTemplateParameters();
5806 if (Params->getMinRequiredArguments() != 1 ||
5807 !isa<TemplateTypeParmDecl>(Params->getParam(0))) {
5808 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list);
5815 QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) {
5816 if (!StdInitializerList) {
5817 StdInitializerList = LookupStdInitializerList(*this, Loc);
5818 if (!StdInitializerList)
5822 TemplateArgumentListInfo Args(Loc, Loc);
5823 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element),
5824 Context.getTrivialTypeSourceInfo(Element,
5826 return Context.getCanonicalType(
5827 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args));
5830 bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) {
5831 // C++ [dcl.init.list]p2:
5832 // A constructor is an initializer-list constructor if its first parameter
5833 // is of type std::initializer_list<E> or reference to possibly cv-qualified
5834 // std::initializer_list<E> for some type E, and either there are no other
5835 // parameters or else all other parameters have default arguments.
5836 if (Ctor->getNumParams() < 1 ||
5837 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg()))
5840 QualType ArgType = Ctor->getParamDecl(0)->getType();
5841 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>())
5842 ArgType = RT->getPointeeType().getUnqualifiedType();
5844 return isStdInitializerList(ArgType, 0);
5847 /// \brief Determine whether a using statement is in a context where it will be
5848 /// apply in all contexts.
5849 static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) {
5850 switch (CurContext->getDeclKind()) {
5851 case Decl::TranslationUnit:
5853 case Decl::LinkageSpec:
5854 return IsUsingDirectiveInToplevelContext(CurContext->getParent());
5862 // Callback to only accept typo corrections that are namespaces.
5863 class NamespaceValidatorCCC : public CorrectionCandidateCallback {
5865 virtual bool ValidateCandidate(const TypoCorrection &candidate) {
5866 if (NamedDecl *ND = candidate.getCorrectionDecl()) {
5867 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND);
5875 static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc,
5877 SourceLocation IdentLoc,
5878 IdentifierInfo *Ident) {
5879 NamespaceValidatorCCC Validator;
5881 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(),
5882 R.getLookupKind(), Sc, &SS,
5884 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts()));
5885 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts()));
5886 if (DeclContext *DC = S.computeDeclContext(SS, false))
5887 S.Diag(IdentLoc, diag::err_using_directive_member_suggest)
5888 << Ident << DC << CorrectedQuotedStr << SS.getRange()
5889 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(),
5892 S.Diag(IdentLoc, diag::err_using_directive_suggest)
5893 << Ident << CorrectedQuotedStr
5894 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr);
5896 S.Diag(Corrected.getCorrectionDecl()->getLocation(),
5897 diag::note_namespace_defined_here) << CorrectedQuotedStr;
5899 R.addDecl(Corrected.getCorrectionDecl());
5905 Decl *Sema::ActOnUsingDirective(Scope *S,
5906 SourceLocation UsingLoc,
5907 SourceLocation NamespcLoc,
5909 SourceLocation IdentLoc,
5910 IdentifierInfo *NamespcName,
5911 AttributeList *AttrList) {
5912 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
5913 assert(NamespcName && "Invalid NamespcName.");
5914 assert(IdentLoc.isValid() && "Invalid NamespceName location.");
5916 // This can only happen along a recovery path.
5917 while (S->getFlags() & Scope::TemplateParamScope)
5919 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
5921 UsingDirectiveDecl *UDir = 0;
5922 NestedNameSpecifier *Qualifier = 0;
5924 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
5926 // Lookup namespace name.
5927 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName);
5928 LookupParsedName(R, S, &SS);
5929 if (R.isAmbiguous())
5934 // Allow "using namespace std;" or "using namespace ::std;" even if
5935 // "std" hasn't been defined yet, for GCC compatibility.
5936 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) &&
5937 NamespcName->isStr("std")) {
5938 Diag(IdentLoc, diag::ext_using_undefined_std);
5939 R.addDecl(getOrCreateStdNamespace());
5942 // Otherwise, attempt typo correction.
5943 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName);
5947 NamedDecl *Named = R.getFoundDecl();
5948 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named))
5949 && "expected namespace decl");
5950 // C++ [namespace.udir]p1:
5951 // A using-directive specifies that the names in the nominated
5952 // namespace can be used in the scope in which the
5953 // using-directive appears after the using-directive. During
5954 // unqualified name lookup (3.4.1), the names appear as if they
5955 // were declared in the nearest enclosing namespace which
5956 // contains both the using-directive and the nominated
5957 // namespace. [Note: in this context, "contains" means "contains
5958 // directly or indirectly". ]
5960 // Find enclosing context containing both using-directive and
5961 // nominated namespace.
5962 NamespaceDecl *NS = getNamespaceDecl(Named);
5963 DeclContext *CommonAncestor = cast<DeclContext>(NS);
5964 while (CommonAncestor && !CommonAncestor->Encloses(CurContext))
5965 CommonAncestor = CommonAncestor->getParent();
5967 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc,
5968 SS.getWithLocInContext(Context),
5969 IdentLoc, Named, CommonAncestor);
5971 if (IsUsingDirectiveInToplevelContext(CurContext) &&
5972 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) {
5973 Diag(IdentLoc, diag::warn_using_directive_in_header);
5976 PushUsingDirective(S, UDir);
5978 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
5981 // FIXME: We ignore attributes for now.
5985 void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) {
5986 // If the scope has an associated entity and the using directive is at
5987 // namespace or translation unit scope, add the UsingDirectiveDecl into
5988 // its lookup structure so qualified name lookup can find it.
5989 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity());
5990 if (Ctx && !Ctx->isFunctionOrMethod())
5993 // Otherwise, it is at block sope. The using-directives will affect lookup
5994 // only to the end of the scope.
5995 S->PushUsingDirective(UDir);
5999 Decl *Sema::ActOnUsingDeclaration(Scope *S,
6001 bool HasUsingKeyword,
6002 SourceLocation UsingLoc,
6004 UnqualifiedId &Name,
6005 AttributeList *AttrList,
6007 SourceLocation TypenameLoc) {
6008 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
6010 switch (Name.getKind()) {
6011 case UnqualifiedId::IK_ImplicitSelfParam:
6012 case UnqualifiedId::IK_Identifier:
6013 case UnqualifiedId::IK_OperatorFunctionId:
6014 case UnqualifiedId::IK_LiteralOperatorId:
6015 case UnqualifiedId::IK_ConversionFunctionId:
6018 case UnqualifiedId::IK_ConstructorName:
6019 case UnqualifiedId::IK_ConstructorTemplateId:
6020 // C++11 inheriting constructors.
6021 Diag(Name.getLocStart(),
6022 getLangOpts().CPlusPlus0x ?
6023 // FIXME: Produce warn_cxx98_compat_using_decl_constructor
6024 // instead once inheriting constructors work.
6025 diag::err_using_decl_constructor_unsupported :
6026 diag::err_using_decl_constructor)
6029 if (getLangOpts().CPlusPlus0x) break;
6033 case UnqualifiedId::IK_DestructorName:
6034 Diag(Name.getLocStart(), diag::err_using_decl_destructor)
6038 case UnqualifiedId::IK_TemplateId:
6039 Diag(Name.getLocStart(), diag::err_using_decl_template_id)
6040 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc);
6044 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name);
6045 DeclarationName TargetName = TargetNameInfo.getName();
6049 // Warn about using declarations.
6050 // TODO: store that the declaration was written without 'using' and
6051 // talk about access decls instead of using decls in the
6053 if (!HasUsingKeyword) {
6054 UsingLoc = Name.getLocStart();
6056 Diag(UsingLoc, diag::warn_access_decl_deprecated)
6057 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using ");
6060 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) ||
6061 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration))
6064 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS,
6065 TargetNameInfo, AttrList,
6066 /* IsInstantiation */ false,
6067 IsTypeName, TypenameLoc);
6069 PushOnScopeChains(UD, S, /*AddToContext*/ false);
6074 /// \brief Determine whether a using declaration considers the given
6075 /// declarations as "equivalent", e.g., if they are redeclarations of
6076 /// the same entity or are both typedefs of the same type.
6078 IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2,
6079 bool &SuppressRedeclaration) {
6080 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) {
6081 SuppressRedeclaration = false;
6085 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1))
6086 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) {
6087 SuppressRedeclaration = true;
6088 return Context.hasSameType(TD1->getUnderlyingType(),
6089 TD2->getUnderlyingType());
6096 /// Determines whether to create a using shadow decl for a particular
6097 /// decl, given the set of decls existing prior to this using lookup.
6098 bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig,
6099 const LookupResult &Previous) {
6100 // Diagnose finding a decl which is not from a base class of the
6101 // current class. We do this now because there are cases where this
6102 // function will silently decide not to build a shadow decl, which
6103 // will pre-empt further diagnostics.
6105 // We don't need to do this in C++0x because we do the check once on
6108 // FIXME: diagnose the following if we care enough:
6109 // struct A { int foo; };
6110 // struct B : A { using A::foo; };
6111 // template <class T> struct C : A {};
6112 // template <class T> struct D : C<T> { using B::foo; } // <---
6113 // This is invalid (during instantiation) in C++03 because B::foo
6114 // resolves to the using decl in B, which is not a base class of D<T>.
6115 // We can't diagnose it immediately because C<T> is an unknown
6116 // specialization. The UsingShadowDecl in D<T> then points directly
6117 // to A::foo, which will look well-formed when we instantiate.
6118 // The right solution is to not collapse the shadow-decl chain.
6119 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) {
6120 DeclContext *OrigDC = Orig->getDeclContext();
6122 // Handle enums and anonymous structs.
6123 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent();
6124 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC);
6125 while (OrigRec->isAnonymousStructOrUnion())
6126 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext());
6128 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) {
6129 if (OrigDC == CurContext) {
6130 Diag(Using->getLocation(),
6131 diag::err_using_decl_nested_name_specifier_is_current_class)
6132 << Using->getQualifierLoc().getSourceRange();
6133 Diag(Orig->getLocation(), diag::note_using_decl_target);
6137 Diag(Using->getQualifierLoc().getBeginLoc(),
6138 diag::err_using_decl_nested_name_specifier_is_not_base_class)
6139 << Using->getQualifier()
6140 << cast<CXXRecordDecl>(CurContext)
6141 << Using->getQualifierLoc().getSourceRange();
6142 Diag(Orig->getLocation(), diag::note_using_decl_target);
6147 if (Previous.empty()) return false;
6149 NamedDecl *Target = Orig;
6150 if (isa<UsingShadowDecl>(Target))
6151 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
6153 // If the target happens to be one of the previous declarations, we
6154 // don't have a conflict.
6156 // FIXME: but we might be increasing its access, in which case we
6157 // should redeclare it.
6158 NamedDecl *NonTag = 0, *Tag = 0;
6159 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
6161 NamedDecl *D = (*I)->getUnderlyingDecl();
6163 if (IsEquivalentForUsingDecl(Context, D, Target, Result))
6166 (isa<TagDecl>(D) ? Tag : NonTag) = D;
6169 if (Target->isFunctionOrFunctionTemplate()) {
6171 if (isa<FunctionTemplateDecl>(Target))
6172 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl();
6174 FD = cast<FunctionDecl>(Target);
6176 NamedDecl *OldDecl = 0;
6177 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) {
6181 case Ovl_NonFunction:
6182 Diag(Using->getLocation(), diag::err_using_decl_conflict);
6185 // We found a decl with the exact signature.
6187 // If we're in a record, we want to hide the target, so we
6188 // return true (without a diagnostic) to tell the caller not to
6189 // build a shadow decl.
6190 if (CurContext->isRecord())
6193 // If we're not in a record, this is an error.
6194 Diag(Using->getLocation(), diag::err_using_decl_conflict);
6198 Diag(Target->getLocation(), diag::note_using_decl_target);
6199 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict);
6203 // Target is not a function.
6205 if (isa<TagDecl>(Target)) {
6206 // No conflict between a tag and a non-tag.
6207 if (!Tag) return false;
6209 Diag(Using->getLocation(), diag::err_using_decl_conflict);
6210 Diag(Target->getLocation(), diag::note_using_decl_target);
6211 Diag(Tag->getLocation(), diag::note_using_decl_conflict);
6215 // No conflict between a tag and a non-tag.
6216 if (!NonTag) return false;
6218 Diag(Using->getLocation(), diag::err_using_decl_conflict);
6219 Diag(Target->getLocation(), diag::note_using_decl_target);
6220 Diag(NonTag->getLocation(), diag::note_using_decl_conflict);
6224 /// Builds a shadow declaration corresponding to a 'using' declaration.
6225 UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S,
6229 // If we resolved to another shadow declaration, just coalesce them.
6230 NamedDecl *Target = Orig;
6231 if (isa<UsingShadowDecl>(Target)) {
6232 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
6233 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration");
6236 UsingShadowDecl *Shadow
6237 = UsingShadowDecl::Create(Context, CurContext,
6238 UD->getLocation(), UD, Target);
6239 UD->addShadowDecl(Shadow);
6241 Shadow->setAccess(UD->getAccess());
6242 if (Orig->isInvalidDecl() || UD->isInvalidDecl())
6243 Shadow->setInvalidDecl();
6246 PushOnScopeChains(Shadow, S);
6248 CurContext->addDecl(Shadow);
6254 /// Hides a using shadow declaration. This is required by the current
6255 /// using-decl implementation when a resolvable using declaration in a
6256 /// class is followed by a declaration which would hide or override
6257 /// one or more of the using decl's targets; for example:
6259 /// struct Base { void foo(int); };
6260 /// struct Derived : Base {
6261 /// using Base::foo;
6265 /// The governing language is C++03 [namespace.udecl]p12:
6267 /// When a using-declaration brings names from a base class into a
6268 /// derived class scope, member functions in the derived class
6269 /// override and/or hide member functions with the same name and
6270 /// parameter types in a base class (rather than conflicting).
6272 /// There are two ways to implement this:
6273 /// (1) optimistically create shadow decls when they're not hidden
6274 /// by existing declarations, or
6275 /// (2) don't create any shadow decls (or at least don't make them
6276 /// visible) until we've fully parsed/instantiated the class.
6277 /// The problem with (1) is that we might have to retroactively remove
6278 /// a shadow decl, which requires several O(n) operations because the
6279 /// decl structures are (very reasonably) not designed for removal.
6280 /// (2) avoids this but is very fiddly and phase-dependent.
6281 void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) {
6282 if (Shadow->getDeclName().getNameKind() ==
6283 DeclarationName::CXXConversionFunctionName)
6284 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow);
6286 // Remove it from the DeclContext...
6287 Shadow->getDeclContext()->removeDecl(Shadow);
6289 // ...and the scope, if applicable...
6291 S->RemoveDecl(Shadow);
6292 IdResolver.RemoveDecl(Shadow);
6295 // ...and the using decl.
6296 Shadow->getUsingDecl()->removeShadowDecl(Shadow);
6298 // TODO: complain somehow if Shadow was used. It shouldn't
6299 // be possible for this to happen, because...?
6302 /// Builds a using declaration.
6304 /// \param IsInstantiation - Whether this call arises from an
6305 /// instantiation of an unresolved using declaration. We treat
6306 /// the lookup differently for these declarations.
6307 NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
6308 SourceLocation UsingLoc,
6310 const DeclarationNameInfo &NameInfo,
6311 AttributeList *AttrList,
6312 bool IsInstantiation,
6314 SourceLocation TypenameLoc) {
6315 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
6316 SourceLocation IdentLoc = NameInfo.getLoc();
6317 assert(IdentLoc.isValid() && "Invalid TargetName location.");
6319 // FIXME: We ignore attributes for now.
6322 Diag(IdentLoc, diag::err_using_requires_qualname);
6326 // Do the redeclaration lookup in the current scope.
6327 LookupResult Previous(*this, NameInfo, LookupUsingDeclName,
6329 Previous.setHideTags(false);
6331 LookupName(Previous, S);
6333 // It is really dumb that we have to do this.
6334 LookupResult::Filter F = Previous.makeFilter();
6335 while (F.hasNext()) {
6336 NamedDecl *D = F.next();
6337 if (!isDeclInScope(D, CurContext, S))
6342 assert(IsInstantiation && "no scope in non-instantiation");
6343 assert(CurContext->isRecord() && "scope not record in instantiation");
6344 LookupQualifiedName(Previous, CurContext);
6347 // Check for invalid redeclarations.
6348 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous))
6351 // Check for bad qualifiers.
6352 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc))
6355 DeclContext *LookupContext = computeDeclContext(SS);
6357 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
6358 if (!LookupContext) {
6360 // FIXME: not all declaration name kinds are legal here
6361 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext,
6362 UsingLoc, TypenameLoc,
6364 IdentLoc, NameInfo.getName());
6366 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc,
6367 QualifierLoc, NameInfo);
6370 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc,
6371 NameInfo, IsTypeName);
6374 CurContext->addDecl(D);
6376 if (!LookupContext) return D;
6377 UsingDecl *UD = cast<UsingDecl>(D);
6379 if (RequireCompleteDeclContext(SS, LookupContext)) {
6380 UD->setInvalidDecl();
6384 // The normal rules do not apply to inheriting constructor declarations.
6385 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) {
6386 if (CheckInheritingConstructorUsingDecl(UD))
6387 UD->setInvalidDecl();
6391 // Otherwise, look up the target name.
6393 LookupResult R(*this, NameInfo, LookupOrdinaryName);
6395 // Unlike most lookups, we don't always want to hide tag
6396 // declarations: tag names are visible through the using declaration
6397 // even if hidden by ordinary names, *except* in a dependent context
6398 // where it's important for the sanity of two-phase lookup.
6399 if (!IsInstantiation)
6400 R.setHideTags(false);
6402 // For the purposes of this lookup, we have a base object type
6403 // equal to that of the current context.
6404 if (CurContext->isRecord()) {
6405 R.setBaseObjectType(
6406 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)));
6409 LookupQualifiedName(R, LookupContext);
6412 Diag(IdentLoc, diag::err_no_member)
6413 << NameInfo.getName() << LookupContext << SS.getRange();
6414 UD->setInvalidDecl();
6418 if (R.isAmbiguous()) {
6419 UD->setInvalidDecl();
6424 // If we asked for a typename and got a non-type decl, error out.
6425 if (!R.getAsSingle<TypeDecl>()) {
6426 Diag(IdentLoc, diag::err_using_typename_non_type);
6427 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
6428 Diag((*I)->getUnderlyingDecl()->getLocation(),
6429 diag::note_using_decl_target);
6430 UD->setInvalidDecl();
6434 // If we asked for a non-typename and we got a type, error out,
6435 // but only if this is an instantiation of an unresolved using
6436 // decl. Otherwise just silently find the type name.
6437 if (IsInstantiation && R.getAsSingle<TypeDecl>()) {
6438 Diag(IdentLoc, diag::err_using_dependent_value_is_type);
6439 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target);
6440 UD->setInvalidDecl();
6445 // C++0x N2914 [namespace.udecl]p6:
6446 // A using-declaration shall not name a namespace.
6447 if (R.getAsSingle<NamespaceDecl>()) {
6448 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace)
6450 UD->setInvalidDecl();
6454 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
6455 if (!CheckUsingShadowDecl(UD, *I, Previous))
6456 BuildUsingShadowDecl(S, UD, *I);
6462 /// Additional checks for a using declaration referring to a constructor name.
6463 bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) {
6464 assert(!UD->isTypeName() && "expecting a constructor name");
6466 const Type *SourceType = UD->getQualifier()->getAsType();
6467 assert(SourceType &&
6468 "Using decl naming constructor doesn't have type in scope spec.");
6469 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext);
6471 // Check whether the named type is a direct base class.
6472 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified();
6473 CXXRecordDecl::base_class_iterator BaseIt, BaseE;
6474 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end();
6475 BaseIt != BaseE; ++BaseIt) {
6476 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified();
6477 if (CanonicalSourceType == BaseType)
6479 if (BaseIt->getType()->isDependentType())
6483 if (BaseIt == BaseE) {
6484 // Did not find SourceType in the bases.
6485 Diag(UD->getUsingLocation(),
6486 diag::err_using_decl_constructor_not_in_direct_base)
6487 << UD->getNameInfo().getSourceRange()
6488 << QualType(SourceType, 0) << TargetClass;
6492 if (!CurContext->isDependentContext())
6493 BaseIt->setInheritConstructors();
6498 /// Checks that the given using declaration is not an invalid
6499 /// redeclaration. Note that this is checking only for the using decl
6500 /// itself, not for any ill-formedness among the UsingShadowDecls.
6501 bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
6503 const CXXScopeSpec &SS,
6504 SourceLocation NameLoc,
6505 const LookupResult &Prev) {
6506 // C++03 [namespace.udecl]p8:
6507 // C++0x [namespace.udecl]p10:
6508 // A using-declaration is a declaration and can therefore be used
6509 // repeatedly where (and only where) multiple declarations are
6512 // That's in non-member contexts.
6513 if (!CurContext->getRedeclContext()->isRecord())
6516 NestedNameSpecifier *Qual
6517 = static_cast<NestedNameSpecifier*>(SS.getScopeRep());
6519 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) {
6523 NestedNameSpecifier *DQual;
6524 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) {
6525 DTypename = UD->isTypeName();
6526 DQual = UD->getQualifier();
6527 } else if (UnresolvedUsingValueDecl *UD
6528 = dyn_cast<UnresolvedUsingValueDecl>(D)) {
6530 DQual = UD->getQualifier();
6531 } else if (UnresolvedUsingTypenameDecl *UD
6532 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
6534 DQual = UD->getQualifier();
6537 // using decls differ if one says 'typename' and the other doesn't.
6538 // FIXME: non-dependent using decls?
6539 if (isTypeName != DTypename) continue;
6541 // using decls differ if they name different scopes (but note that
6542 // template instantiation can cause this check to trigger when it
6543 // didn't before instantiation).
6544 if (Context.getCanonicalNestedNameSpecifier(Qual) !=
6545 Context.getCanonicalNestedNameSpecifier(DQual))
6548 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange();
6549 Diag(D->getLocation(), diag::note_using_decl) << 1;
6557 /// Checks that the given nested-name qualifier used in a using decl
6558 /// in the current context is appropriately related to the current
6559 /// scope. If an error is found, diagnoses it and returns true.
6560 bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc,
6561 const CXXScopeSpec &SS,
6562 SourceLocation NameLoc) {
6563 DeclContext *NamedContext = computeDeclContext(SS);
6565 if (!CurContext->isRecord()) {
6566 // C++03 [namespace.udecl]p3:
6567 // C++0x [namespace.udecl]p8:
6568 // A using-declaration for a class member shall be a member-declaration.
6570 // If we weren't able to compute a valid scope, it must be a
6571 // dependent class scope.
6572 if (!NamedContext || NamedContext->isRecord()) {
6573 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member)
6578 // Otherwise, everything is known to be fine.
6582 // The current scope is a record.
6584 // If the named context is dependent, we can't decide much.
6585 if (!NamedContext) {
6586 // FIXME: in C++0x, we can diagnose if we can prove that the
6587 // nested-name-specifier does not refer to a base class, which is
6588 // still possible in some cases.
6590 // Otherwise we have to conservatively report that things might be
6595 if (!NamedContext->isRecord()) {
6596 // Ideally this would point at the last name in the specifier,
6597 // but we don't have that level of source info.
6598 Diag(SS.getRange().getBegin(),
6599 diag::err_using_decl_nested_name_specifier_is_not_class)
6600 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange();
6604 if (!NamedContext->isDependentContext() &&
6605 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext))
6608 if (getLangOpts().CPlusPlus0x) {
6609 // C++0x [namespace.udecl]p3:
6610 // In a using-declaration used as a member-declaration, the
6611 // nested-name-specifier shall name a base class of the class
6614 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(
6615 cast<CXXRecordDecl>(NamedContext))) {
6616 if (CurContext == NamedContext) {
6618 diag::err_using_decl_nested_name_specifier_is_current_class)
6623 Diag(SS.getRange().getBegin(),
6624 diag::err_using_decl_nested_name_specifier_is_not_base_class)
6625 << (NestedNameSpecifier*) SS.getScopeRep()
6626 << cast<CXXRecordDecl>(CurContext)
6634 // C++03 [namespace.udecl]p4:
6635 // A using-declaration used as a member-declaration shall refer
6636 // to a member of a base class of the class being defined [etc.].
6638 // Salient point: SS doesn't have to name a base class as long as
6639 // lookup only finds members from base classes. Therefore we can
6640 // diagnose here only if we can prove that that can't happen,
6641 // i.e. if the class hierarchies provably don't intersect.
6643 // TODO: it would be nice if "definitely valid" results were cached
6644 // in the UsingDecl and UsingShadowDecl so that these checks didn't
6645 // need to be repeated.
6648 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases;
6650 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) {
6651 UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
6652 Data->Bases.insert(Base);
6656 bool hasDependentBases(const CXXRecordDecl *Class) {
6657 return !Class->forallBases(collect, this);
6660 /// Returns true if the base is dependent or is one of the
6661 /// accumulated base classes.
6662 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) {
6663 UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
6664 return !Data->Bases.count(Base);
6667 bool mightShareBases(const CXXRecordDecl *Class) {
6668 return Bases.count(Class) || !Class->forallBases(doesNotContain, this);
6674 // Returns false if we find a dependent base.
6675 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext)))
6678 // Returns false if the class has a dependent base or if it or one
6679 // of its bases is present in the base set of the current context.
6680 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext)))
6683 Diag(SS.getRange().getBegin(),
6684 diag::err_using_decl_nested_name_specifier_is_not_base_class)
6685 << (NestedNameSpecifier*) SS.getScopeRep()
6686 << cast<CXXRecordDecl>(CurContext)
6692 Decl *Sema::ActOnAliasDeclaration(Scope *S,
6694 MultiTemplateParamsArg TemplateParamLists,
6695 SourceLocation UsingLoc,
6696 UnqualifiedId &Name,
6698 // Skip up to the relevant declaration scope.
6699 while (S->getFlags() & Scope::TemplateParamScope)
6701 assert((S->getFlags() & Scope::DeclScope) &&
6702 "got alias-declaration outside of declaration scope");
6704 if (Type.isInvalid())
6707 bool Invalid = false;
6708 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name);
6709 TypeSourceInfo *TInfo = 0;
6710 GetTypeFromParser(Type.get(), &TInfo);
6712 if (DiagnoseClassNameShadow(CurContext, NameInfo))
6715 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo,
6716 UPPC_DeclarationType)) {
6718 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
6719 TInfo->getTypeLoc().getBeginLoc());
6722 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration);
6723 LookupName(Previous, S);
6725 // Warn about shadowing the name of a template parameter.
6726 if (Previous.isSingleResult() &&
6727 Previous.getFoundDecl()->isTemplateParameter()) {
6728 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl());
6732 assert(Name.Kind == UnqualifiedId::IK_Identifier &&
6733 "name in alias declaration must be an identifier");
6734 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc,
6736 Name.Identifier, TInfo);
6738 NewTD->setAccess(AS);
6741 NewTD->setInvalidDecl();
6743 CheckTypedefForVariablyModifiedType(S, NewTD);
6744 Invalid |= NewTD->isInvalidDecl();
6746 bool Redeclaration = false;
6749 if (TemplateParamLists.size()) {
6750 TypeAliasTemplateDecl *OldDecl = 0;
6751 TemplateParameterList *OldTemplateParams = 0;
6753 if (TemplateParamLists.size() != 1) {
6754 Diag(UsingLoc, diag::err_alias_template_extra_headers)
6755 << SourceRange(TemplateParamLists[1]->getTemplateLoc(),
6756 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc());
6758 TemplateParameterList *TemplateParams = TemplateParamLists[0];
6760 // Only consider previous declarations in the same scope.
6761 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false,
6762 /*ExplicitInstantiationOrSpecialization*/false);
6763 if (!Previous.empty()) {
6764 Redeclaration = true;
6766 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>();
6767 if (!OldDecl && !Invalid) {
6768 Diag(UsingLoc, diag::err_redefinition_different_kind)
6771 NamedDecl *OldD = Previous.getRepresentativeDecl();
6772 if (OldD->getLocation().isValid())
6773 Diag(OldD->getLocation(), diag::note_previous_definition);
6778 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) {
6779 if (TemplateParameterListsAreEqual(TemplateParams,
6780 OldDecl->getTemplateParameters(),
6783 OldTemplateParams = OldDecl->getTemplateParameters();
6787 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl();
6789 !Context.hasSameType(OldTD->getUnderlyingType(),
6790 NewTD->getUnderlyingType())) {
6791 // FIXME: The C++0x standard does not clearly say this is ill-formed,
6792 // but we can't reasonably accept it.
6793 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef)
6794 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType();
6795 if (OldTD->getLocation().isValid())
6796 Diag(OldTD->getLocation(), diag::note_previous_definition);
6802 // Merge any previous default template arguments into our parameters,
6803 // and check the parameter list.
6804 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams,
6805 TPC_TypeAliasTemplate))
6808 TypeAliasTemplateDecl *NewDecl =
6809 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc,
6810 Name.Identifier, TemplateParams,
6813 NewDecl->setAccess(AS);
6816 NewDecl->setInvalidDecl();
6818 NewDecl->setPreviousDeclaration(OldDecl);
6822 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration);
6827 PushOnScopeChains(NewND, S);
6829 ActOnDocumentableDecl(NewND);
6833 Decl *Sema::ActOnNamespaceAliasDef(Scope *S,
6834 SourceLocation NamespaceLoc,
6835 SourceLocation AliasLoc,
6836 IdentifierInfo *Alias,
6838 SourceLocation IdentLoc,
6839 IdentifierInfo *Ident) {
6841 // Lookup the namespace name.
6842 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName);
6843 LookupParsedName(R, S, &SS);
6845 // Check if we have a previous declaration with the same name.
6847 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName,
6849 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S))
6853 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) {
6854 // We already have an alias with the same name that points to the same
6855 // namespace, so don't create a new one.
6856 // FIXME: At some point, we'll want to create the (redundant)
6857 // declaration to maintain better source information.
6858 if (!R.isAmbiguous() && !R.empty() &&
6859 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl())))
6863 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition :
6864 diag::err_redefinition_different_kind;
6865 Diag(AliasLoc, DiagID) << Alias;
6866 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
6870 if (R.isAmbiguous())
6874 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) {
6875 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
6880 NamespaceAliasDecl *AliasDecl =
6881 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc,
6882 Alias, SS.getWithLocInContext(Context),
6883 IdentLoc, R.getFoundDecl());
6885 PushOnScopeChains(AliasDecl, S);
6889 Sema::ImplicitExceptionSpecification
6890 Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc,
6891 CXXMethodDecl *MD) {
6892 CXXRecordDecl *ClassDecl = MD->getParent();
6894 // C++ [except.spec]p14:
6895 // An implicitly declared special member function (Clause 12) shall have an
6896 // exception-specification. [...]
6897 ImplicitExceptionSpecification ExceptSpec(*this);
6898 if (ClassDecl->isInvalidDecl())
6901 // Direct base-class constructors.
6902 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
6903 BEnd = ClassDecl->bases_end();
6905 if (B->isVirtual()) // Handled below.
6908 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
6909 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
6910 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
6911 // If this is a deleted function, add it anyway. This might be conformant
6912 // with the standard. This might not. I'm not sure. It might not matter.
6914 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
6918 // Virtual base-class constructors.
6919 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
6920 BEnd = ClassDecl->vbases_end();
6922 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
6923 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
6924 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
6925 // If this is a deleted function, add it anyway. This might be conformant
6926 // with the standard. This might not. I'm not sure. It might not matter.
6928 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
6932 // Field constructors.
6933 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
6934 FEnd = ClassDecl->field_end();
6936 if (F->hasInClassInitializer()) {
6937 if (Expr *E = F->getInClassInitializer())
6938 ExceptSpec.CalledExpr(E);
6939 else if (!F->isInvalidDecl())
6941 // If the brace-or-equal-initializer of a non-static data member
6942 // invokes a defaulted default constructor of its class or of an
6943 // enclosing class in a potentially evaluated subexpression, the
6944 // program is ill-formed.
6946 // This resolution is unworkable: the exception specification of the
6947 // default constructor can be needed in an unevaluated context, in
6948 // particular, in the operand of a noexcept-expression, and we can be
6949 // unable to compute an exception specification for an enclosed class.
6951 // We do not allow an in-class initializer to require the evaluation
6952 // of the exception specification for any in-class initializer whose
6953 // definition is not lexically complete.
6954 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD;
6955 } else if (const RecordType *RecordTy
6956 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) {
6957 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
6958 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl);
6959 // If this is a deleted function, add it anyway. This might be conformant
6960 // with the standard. This might not. I'm not sure. It might not matter.
6961 // In particular, the problem is that this function never gets called. It
6962 // might just be ill-formed because this function attempts to refer to
6963 // a deleted function here.
6965 ExceptSpec.CalledDecl(F->getLocation(), Constructor);
6972 CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor(
6973 CXXRecordDecl *ClassDecl) {
6974 // C++ [class.ctor]p5:
6975 // A default constructor for a class X is a constructor of class X
6976 // that can be called without an argument. If there is no
6977 // user-declared constructor for class X, a default constructor is
6978 // implicitly declared. An implicitly-declared default constructor
6979 // is an inline public member of its class.
6980 assert(!ClassDecl->hasUserDeclaredConstructor() &&
6981 "Should not build implicit default constructor!");
6983 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
6984 CXXDefaultConstructor,
6987 // Create the actual constructor declaration.
6988 CanQualType ClassType
6989 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
6990 SourceLocation ClassLoc = ClassDecl->getLocation();
6991 DeclarationName Name
6992 = Context.DeclarationNames.getCXXConstructorName(ClassType);
6993 DeclarationNameInfo NameInfo(Name, ClassLoc);
6994 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create(
6995 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0,
6996 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true,
6998 DefaultCon->setAccess(AS_public);
6999 DefaultCon->setDefaulted();
7000 DefaultCon->setImplicit();
7001 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor());
7003 // Build an exception specification pointing back at this constructor.
7004 FunctionProtoType::ExtProtoInfo EPI;
7005 EPI.ExceptionSpecType = EST_Unevaluated;
7006 EPI.ExceptionSpecDecl = DefaultCon;
7007 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI));
7009 // Note that we have declared this constructor.
7010 ++ASTContext::NumImplicitDefaultConstructorsDeclared;
7012 if (Scope *S = getScopeForContext(ClassDecl))
7013 PushOnScopeChains(DefaultCon, S, false);
7014 ClassDecl->addDecl(DefaultCon);
7016 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor))
7017 DefaultCon->setDeletedAsWritten();
7022 void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
7023 CXXConstructorDecl *Constructor) {
7024 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&
7025 !Constructor->doesThisDeclarationHaveABody() &&
7026 !Constructor->isDeleted()) &&
7027 "DefineImplicitDefaultConstructor - call it for implicit default ctor");
7029 CXXRecordDecl *ClassDecl = Constructor->getParent();
7030 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor");
7032 SynthesizedFunctionScope Scope(*this, Constructor);
7033 DiagnosticErrorTrap Trap(Diags);
7034 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) ||
7035 Trap.hasErrorOccurred()) {
7036 Diag(CurrentLocation, diag::note_member_synthesized_at)
7037 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl);
7038 Constructor->setInvalidDecl();
7042 SourceLocation Loc = Constructor->getLocation();
7043 Constructor->setBody(new (Context) CompoundStmt(Loc));
7045 Constructor->setUsed();
7046 MarkVTableUsed(CurrentLocation, ClassDecl);
7048 if (ASTMutationListener *L = getASTMutationListener()) {
7049 L->CompletedImplicitDefinition(Constructor);
7053 void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) {
7055 AdjustDeclIfTemplate(D);
7057 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D);
7059 if (!ClassDecl->isDependentType())
7060 CheckExplicitlyDefaultedMethods(ClassDecl);
7063 void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) {
7064 // We start with an initial pass over the base classes to collect those that
7065 // inherit constructors from. If there are none, we can forgo all further
7067 typedef SmallVector<const RecordType *, 4> BasesVector;
7068 BasesVector BasesToInheritFrom;
7069 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(),
7070 BaseE = ClassDecl->bases_end();
7071 BaseIt != BaseE; ++BaseIt) {
7072 if (BaseIt->getInheritConstructors()) {
7073 QualType Base = BaseIt->getType();
7074 if (Base->isDependentType()) {
7075 // If we inherit constructors from anything that is dependent, just
7076 // abort processing altogether. We'll get another chance for the
7080 BasesToInheritFrom.push_back(Base->castAs<RecordType>());
7083 if (BasesToInheritFrom.empty())
7086 // Now collect the constructors that we already have in the current class.
7087 // Those take precedence over inherited constructors.
7088 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...]
7089 // unless there is a user-declared constructor with the same signature in
7090 // the class where the using-declaration appears.
7091 llvm::SmallSet<const Type *, 8> ExistingConstructors;
7092 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(),
7093 CtorE = ClassDecl->ctor_end();
7094 CtorIt != CtorE; ++CtorIt) {
7095 ExistingConstructors.insert(
7096 Context.getCanonicalType(CtorIt->getType()).getTypePtr());
7099 DeclarationName CreatedCtorName =
7100 Context.DeclarationNames.getCXXConstructorName(
7101 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified());
7103 // Now comes the true work.
7104 // First, we keep a map from constructor types to the base that introduced
7105 // them. Needed for finding conflicting constructors. We also keep the
7106 // actually inserted declarations in there, for pretty diagnostics.
7107 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo;
7108 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap;
7109 ConstructorToSourceMap InheritedConstructors;
7110 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(),
7111 BaseE = BasesToInheritFrom.end();
7112 BaseIt != BaseE; ++BaseIt) {
7113 const RecordType *Base = *BaseIt;
7114 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified();
7115 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl());
7116 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(),
7117 CtorE = BaseDecl->ctor_end();
7118 CtorIt != CtorE; ++CtorIt) {
7119 // Find the using declaration for inheriting this base's constructors.
7120 // FIXME: Don't perform name lookup just to obtain a source location!
7121 DeclarationName Name =
7122 Context.DeclarationNames.getCXXConstructorName(CanonicalBase);
7123 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName);
7124 LookupQualifiedName(Result, CurContext);
7125 UsingDecl *UD = Result.getAsSingle<UsingDecl>();
7126 SourceLocation UsingLoc = UD ? UD->getLocation() :
7127 ClassDecl->getLocation();
7129 // C++0x [class.inhctor]p1: The candidate set of inherited constructors
7130 // from the class X named in the using-declaration consists of actual
7131 // constructors and notional constructors that result from the
7132 // transformation of defaulted parameters as follows:
7133 // - all non-template default constructors of X, and
7134 // - for each non-template constructor of X that has at least one
7135 // parameter with a default argument, the set of constructors that
7136 // results from omitting any ellipsis parameter specification and
7137 // successively omitting parameters with a default argument from the
7138 // end of the parameter-type-list.
7139 CXXConstructorDecl *BaseCtor = *CtorIt;
7140 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor();
7141 const FunctionProtoType *BaseCtorType =
7142 BaseCtor->getType()->getAs<FunctionProtoType>();
7144 for (unsigned params = BaseCtor->getMinRequiredArguments(),
7145 maxParams = BaseCtor->getNumParams();
7146 params <= maxParams; ++params) {
7147 // Skip default constructors. They're never inherited.
7150 // Skip copy and move constructors for the same reason.
7151 if (CanBeCopyOrMove && params == 1)
7154 // Build up a function type for this particular constructor.
7155 // FIXME: The working paper does not consider that the exception spec
7156 // for the inheriting constructor might be larger than that of the
7157 // source. This code doesn't yet, either. When it does, this code will
7158 // need to be delayed until after exception specifications and in-class
7159 // member initializers are attached.
7160 const Type *NewCtorType;
7161 if (params == maxParams)
7162 NewCtorType = BaseCtorType;
7164 SmallVector<QualType, 16> Args;
7165 for (unsigned i = 0; i < params; ++i) {
7166 Args.push_back(BaseCtorType->getArgType(i));
7168 FunctionProtoType::ExtProtoInfo ExtInfo =
7169 BaseCtorType->getExtProtoInfo();
7170 ExtInfo.Variadic = false;
7171 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(),
7172 Args.data(), params, ExtInfo)
7175 const Type *CanonicalNewCtorType =
7176 Context.getCanonicalType(NewCtorType);
7178 // Now that we have the type, first check if the class already has a
7179 // constructor with this signature.
7180 if (ExistingConstructors.count(CanonicalNewCtorType))
7183 // Then we check if we have already declared an inherited constructor
7184 // with this signature.
7185 std::pair<ConstructorToSourceMap::iterator, bool> result =
7186 InheritedConstructors.insert(std::make_pair(
7187 CanonicalNewCtorType,
7188 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0)));
7189 if (!result.second) {
7190 // Already in the map. If it came from a different class, that's an
7191 // error. Not if it's from the same.
7192 CanQualType PreviousBase = result.first->second.first;
7193 if (CanonicalBase != PreviousBase) {
7194 const CXXConstructorDecl *PrevCtor = result.first->second.second;
7195 const CXXConstructorDecl *PrevBaseCtor =
7196 PrevCtor->getInheritedConstructor();
7197 assert(PrevBaseCtor && "Conflicting constructor was not inherited");
7199 Diag(UsingLoc, diag::err_using_decl_constructor_conflict);
7200 Diag(BaseCtor->getLocation(),
7201 diag::note_using_decl_constructor_conflict_current_ctor);
7202 Diag(PrevBaseCtor->getLocation(),
7203 diag::note_using_decl_constructor_conflict_previous_ctor);
7204 Diag(PrevCtor->getLocation(),
7205 diag::note_using_decl_constructor_conflict_previous_using);
7210 // OK, we're there, now add the constructor.
7211 // C++0x [class.inhctor]p8: [...] that would be performed by a
7212 // user-written inline constructor [...]
7213 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc);
7214 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create(
7215 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0),
7216 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true,
7217 /*ImplicitlyDeclared=*/true,
7218 // FIXME: Due to a defect in the standard, we treat inherited
7219 // constructors as constexpr even if that makes them ill-formed.
7220 /*Constexpr=*/BaseCtor->isConstexpr());
7221 NewCtor->setAccess(BaseCtor->getAccess());
7223 // Build up the parameter decls and add them.
7224 SmallVector<ParmVarDecl *, 16> ParamDecls;
7225 for (unsigned i = 0; i < params; ++i) {
7226 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor,
7228 /*IdentifierInfo=*/0,
7229 BaseCtorType->getArgType(i),
7230 /*TInfo=*/0, SC_None,
7231 SC_None, /*DefaultArg=*/0));
7233 NewCtor->setParams(ParamDecls);
7234 NewCtor->setInheritedConstructor(BaseCtor);
7236 ClassDecl->addDecl(NewCtor);
7237 result.first->second.second = NewCtor;
7243 Sema::ImplicitExceptionSpecification
7244 Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) {
7245 CXXRecordDecl *ClassDecl = MD->getParent();
7247 // C++ [except.spec]p14:
7248 // An implicitly declared special member function (Clause 12) shall have
7249 // an exception-specification.
7250 ImplicitExceptionSpecification ExceptSpec(*this);
7251 if (ClassDecl->isInvalidDecl())
7254 // Direct base-class destructors.
7255 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
7256 BEnd = ClassDecl->bases_end();
7258 if (B->isVirtual()) // Handled below.
7261 if (const RecordType *BaseType = B->getType()->getAs<RecordType>())
7262 ExceptSpec.CalledDecl(B->getLocStart(),
7263 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl())));
7266 // Virtual base-class destructors.
7267 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
7268 BEnd = ClassDecl->vbases_end();
7270 if (const RecordType *BaseType = B->getType()->getAs<RecordType>())
7271 ExceptSpec.CalledDecl(B->getLocStart(),
7272 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl())));
7275 // Field destructors.
7276 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
7277 FEnd = ClassDecl->field_end();
7279 if (const RecordType *RecordTy
7280 = Context.getBaseElementType(F->getType())->getAs<RecordType>())
7281 ExceptSpec.CalledDecl(F->getLocation(),
7282 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl())));
7288 CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) {
7289 // C++ [class.dtor]p2:
7290 // If a class has no user-declared destructor, a destructor is
7291 // declared implicitly. An implicitly-declared destructor is an
7292 // inline public member of its class.
7294 // Create the actual destructor declaration.
7295 CanQualType ClassType
7296 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
7297 SourceLocation ClassLoc = ClassDecl->getLocation();
7298 DeclarationName Name
7299 = Context.DeclarationNames.getCXXDestructorName(ClassType);
7300 DeclarationNameInfo NameInfo(Name, ClassLoc);
7301 CXXDestructorDecl *Destructor
7302 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo,
7303 QualType(), 0, /*isInline=*/true,
7304 /*isImplicitlyDeclared=*/true);
7305 Destructor->setAccess(AS_public);
7306 Destructor->setDefaulted();
7307 Destructor->setImplicit();
7308 Destructor->setTrivial(ClassDecl->hasTrivialDestructor());
7310 // Build an exception specification pointing back at this destructor.
7311 FunctionProtoType::ExtProtoInfo EPI;
7312 EPI.ExceptionSpecType = EST_Unevaluated;
7313 EPI.ExceptionSpecDecl = Destructor;
7314 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI));
7316 // Note that we have declared this destructor.
7317 ++ASTContext::NumImplicitDestructorsDeclared;
7319 // Introduce this destructor into its scope.
7320 if (Scope *S = getScopeForContext(ClassDecl))
7321 PushOnScopeChains(Destructor, S, false);
7322 ClassDecl->addDecl(Destructor);
7324 AddOverriddenMethods(ClassDecl, Destructor);
7326 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor))
7327 Destructor->setDeletedAsWritten();
7332 void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation,
7333 CXXDestructorDecl *Destructor) {
7334 assert((Destructor->isDefaulted() &&
7335 !Destructor->doesThisDeclarationHaveABody() &&
7336 !Destructor->isDeleted()) &&
7337 "DefineImplicitDestructor - call it for implicit default dtor");
7338 CXXRecordDecl *ClassDecl = Destructor->getParent();
7339 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor");
7341 if (Destructor->isInvalidDecl())
7344 SynthesizedFunctionScope Scope(*this, Destructor);
7346 DiagnosticErrorTrap Trap(Diags);
7347 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
7348 Destructor->getParent());
7350 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) {
7351 Diag(CurrentLocation, diag::note_member_synthesized_at)
7352 << CXXDestructor << Context.getTagDeclType(ClassDecl);
7354 Destructor->setInvalidDecl();
7358 SourceLocation Loc = Destructor->getLocation();
7359 Destructor->setBody(new (Context) CompoundStmt(Loc));
7360 Destructor->setImplicitlyDefined(true);
7361 Destructor->setUsed();
7362 MarkVTableUsed(CurrentLocation, ClassDecl);
7364 if (ASTMutationListener *L = getASTMutationListener()) {
7365 L->CompletedImplicitDefinition(Destructor);
7369 /// \brief Perform any semantic analysis which needs to be delayed until all
7370 /// pending class member declarations have been parsed.
7371 void Sema::ActOnFinishCXXMemberDecls() {
7372 // Perform any deferred checking of exception specifications for virtual
7374 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size();
7376 const CXXDestructorDecl *Dtor =
7377 DelayedDestructorExceptionSpecChecks[i].first;
7378 assert(!Dtor->getParent()->isDependentType() &&
7379 "Should not ever add destructors of templates into the list.");
7380 CheckOverridingFunctionExceptionSpec(Dtor,
7381 DelayedDestructorExceptionSpecChecks[i].second);
7383 DelayedDestructorExceptionSpecChecks.clear();
7386 void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl,
7387 CXXDestructorDecl *Destructor) {
7388 assert(getLangOpts().CPlusPlus0x &&
7389 "adjusting dtor exception specs was introduced in c++11");
7391 // C++11 [class.dtor]p3:
7392 // A declaration of a destructor that does not have an exception-
7393 // specification is implicitly considered to have the same exception-
7394 // specification as an implicit declaration.
7395 const FunctionProtoType *DtorType = Destructor->getType()->
7396 getAs<FunctionProtoType>();
7397 if (DtorType->hasExceptionSpec())
7400 // Replace the destructor's type, building off the existing one. Fortunately,
7401 // the only thing of interest in the destructor type is its extended info.
7402 // The return and arguments are fixed.
7403 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo();
7404 EPI.ExceptionSpecType = EST_Unevaluated;
7405 EPI.ExceptionSpecDecl = Destructor;
7406 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI));
7408 // FIXME: If the destructor has a body that could throw, and the newly created
7409 // spec doesn't allow exceptions, we should emit a warning, because this
7410 // change in behavior can break conforming C++03 programs at runtime.
7411 // However, we don't have a body or an exception specification yet, so it
7412 // needs to be done somewhere else.
7415 /// \brief Builds a statement that copies/moves the given entity from \p From to
7418 /// This routine is used to copy/move the members of a class with an
7419 /// implicitly-declared copy/move assignment operator. When the entities being
7420 /// copied are arrays, this routine builds for loops to copy them.
7422 /// \param S The Sema object used for type-checking.
7424 /// \param Loc The location where the implicit copy/move is being generated.
7426 /// \param T The type of the expressions being copied/moved. Both expressions
7427 /// must have this type.
7429 /// \param To The expression we are copying/moving to.
7431 /// \param From The expression we are copying/moving from.
7433 /// \param CopyingBaseSubobject Whether we're copying/moving a base subobject.
7434 /// Otherwise, it's a non-static member subobject.
7436 /// \param Copying Whether we're copying or moving.
7438 /// \param Depth Internal parameter recording the depth of the recursion.
7440 /// \returns A statement or a loop that copies the expressions.
7442 BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T,
7443 Expr *To, Expr *From,
7444 bool CopyingBaseSubobject, bool Copying,
7445 unsigned Depth = 0) {
7446 // C++0x [class.copy]p28:
7447 // Each subobject is assigned in the manner appropriate to its type:
7449 // - if the subobject is of class type, as if by a call to operator= with
7450 // the subobject as the object expression and the corresponding
7451 // subobject of x as a single function argument (as if by explicit
7452 // qualification; that is, ignoring any possible virtual overriding
7453 // functions in more derived classes);
7454 if (const RecordType *RecordTy = T->getAs<RecordType>()) {
7455 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
7457 // Look for operator=.
7458 DeclarationName Name
7459 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal);
7460 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName);
7461 S.LookupQualifiedName(OpLookup, ClassDecl, false);
7463 // Filter out any result that isn't a copy/move-assignment operator.
7464 LookupResult::Filter F = OpLookup.makeFilter();
7465 while (F.hasNext()) {
7466 NamedDecl *D = F.next();
7467 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
7468 if (Method->isCopyAssignmentOperator() ||
7469 (!Copying && Method->isMoveAssignmentOperator()))
7476 // Suppress the protected check (C++ [class.protected]) for each of the
7477 // assignment operators we found. This strange dance is required when
7478 // we're assigning via a base classes's copy-assignment operator. To
7479 // ensure that we're getting the right base class subobject (without
7480 // ambiguities), we need to cast "this" to that subobject type; to
7481 // ensure that we don't go through the virtual call mechanism, we need
7482 // to qualify the operator= name with the base class (see below). However,
7483 // this means that if the base class has a protected copy assignment
7484 // operator, the protected member access check will fail. So, we
7485 // rewrite "protected" access to "public" access in this case, since we
7486 // know by construction that we're calling from a derived class.
7487 if (CopyingBaseSubobject) {
7488 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end();
7490 if (L.getAccess() == AS_protected)
7491 L.setAccess(AS_public);
7495 // Create the nested-name-specifier that will be used to qualify the
7496 // reference to operator=; this is required to suppress the virtual
7499 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr());
7500 SS.MakeTrivial(S.Context,
7501 NestedNameSpecifier::Create(S.Context, 0, false,
7505 // Create the reference to operator=.
7506 ExprResult OpEqualRef
7507 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS,
7508 /*TemplateKWLoc=*/SourceLocation(),
7509 /*FirstQualifierInScope=*/0,
7512 /*SuppressQualifierCheck=*/true);
7513 if (OpEqualRef.isInvalid())
7516 // Build the call to the assignment operator.
7518 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0,
7519 OpEqualRef.takeAs<Expr>(),
7520 Loc, &From, 1, Loc);
7521 if (Call.isInvalid())
7524 return S.Owned(Call.takeAs<Stmt>());
7527 // - if the subobject is of scalar type, the built-in assignment
7528 // operator is used.
7529 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T);
7531 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From);
7532 if (Assignment.isInvalid())
7535 return S.Owned(Assignment.takeAs<Stmt>());
7538 // - if the subobject is an array, each element is assigned, in the
7539 // manner appropriate to the element type;
7541 // Construct a loop over the array bounds, e.g.,
7543 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0)
7545 // that will copy each of the array elements.
7546 QualType SizeType = S.Context.getSizeType();
7548 // Create the iteration variable.
7549 IdentifierInfo *IterationVarName = 0;
7552 llvm::raw_svector_ostream OS(Str);
7553 OS << "__i" << Depth;
7554 IterationVarName = &S.Context.Idents.get(OS.str());
7556 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc,
7557 IterationVarName, SizeType,
7558 S.Context.getTrivialTypeSourceInfo(SizeType, Loc),
7561 // Initialize the iteration variable to zero.
7562 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0);
7563 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc));
7565 // Create a reference to the iteration variable; we'll use this several
7566 // times throughout.
7567 Expr *IterationVarRef
7568 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take();
7569 assert(IterationVarRef && "Reference to invented variable cannot fail!");
7570 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take();
7571 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!");
7573 // Create the DeclStmt that holds the iteration variable.
7574 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc);
7576 // Create the comparison against the array bound.
7578 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType));
7580 = new (S.Context) BinaryOperator(IterationVarRefRVal,
7581 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc),
7582 BO_NE, S.Context.BoolTy,
7583 VK_RValue, OK_Ordinary, Loc, false);
7585 // Create the pre-increment of the iteration variable.
7587 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType,
7588 VK_LValue, OK_Ordinary, Loc);
7590 // Subscript the "from" and "to" expressions with the iteration variable.
7591 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc,
7592 IterationVarRefRVal,
7594 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc,
7595 IterationVarRefRVal,
7597 if (!Copying) // Cast to rvalue
7598 From = CastForMoving(S, From);
7600 // Build the copy/move for an individual element of the array.
7601 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(),
7602 To, From, CopyingBaseSubobject,
7603 Copying, Depth + 1);
7604 if (Copy.isInvalid())
7607 // Construct the loop that copies all elements of this array.
7608 return S.ActOnForStmt(Loc, Loc, InitStmt,
7609 S.MakeFullExpr(Comparison),
7610 0, S.MakeFullExpr(Increment),
7614 /// Determine whether an implicit copy assignment operator for ClassDecl has a
7616 /// FIXME: It ought to be possible to store this on the record.
7617 static bool isImplicitCopyAssignmentArgConst(Sema &S,
7618 CXXRecordDecl *ClassDecl) {
7619 if (ClassDecl->isInvalidDecl())
7622 // C++ [class.copy]p10:
7623 // If the class definition does not explicitly declare a copy
7624 // assignment operator, one is declared implicitly.
7625 // The implicitly-defined copy assignment operator for a class X
7626 // will have the form
7628 // X& X::operator=(const X&)
7631 // -- each direct base class B of X has a copy assignment operator
7632 // whose parameter is of type const B&, const volatile B& or B,
7634 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
7635 BaseEnd = ClassDecl->bases_end();
7636 Base != BaseEnd; ++Base) {
7637 // We'll handle this below
7638 if (S.getLangOpts().CPlusPlus0x && Base->isVirtual())
7641 assert(!Base->getType()->isDependentType() &&
7642 "Cannot generate implicit members for class with dependent bases.");
7643 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl();
7644 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0))
7648 // In C++11, the above citation has "or virtual" added
7649 if (S.getLangOpts().CPlusPlus0x) {
7650 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
7651 BaseEnd = ClassDecl->vbases_end();
7652 Base != BaseEnd; ++Base) {
7653 assert(!Base->getType()->isDependentType() &&
7654 "Cannot generate implicit members for class with dependent bases.");
7655 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl();
7656 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const,
7662 // -- for all the nonstatic data members of X that are of a class
7663 // type M (or array thereof), each such class type has a copy
7664 // assignment operator whose parameter is of type const M&,
7665 // const volatile M& or M.
7666 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
7667 FieldEnd = ClassDecl->field_end();
7668 Field != FieldEnd; ++Field) {
7669 QualType FieldType = S.Context.getBaseElementType(Field->getType());
7670 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl())
7671 if (!S.LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const,
7676 // Otherwise, the implicitly declared copy assignment operator will
7679 // X& X::operator=(X&)
7684 Sema::ImplicitExceptionSpecification
7685 Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) {
7686 CXXRecordDecl *ClassDecl = MD->getParent();
7688 ImplicitExceptionSpecification ExceptSpec(*this);
7689 if (ClassDecl->isInvalidDecl())
7692 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>();
7693 assert(T->getNumArgs() == 1 && "not a copy assignment op");
7694 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers();
7696 // C++ [except.spec]p14:
7697 // An implicitly declared special member function (Clause 12) shall have an
7698 // exception-specification. [...]
7700 // It is unspecified whether or not an implicit copy assignment operator
7701 // attempts to deduplicate calls to assignment operators of virtual bases are
7702 // made. As such, this exception specification is effectively unspecified.
7703 // Based on a similar decision made for constness in C++0x, we're erring on
7704 // the side of assuming such calls to be made regardless of whether they
7706 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
7707 BaseEnd = ClassDecl->bases_end();
7708 Base != BaseEnd; ++Base) {
7709 if (Base->isVirtual())
7712 CXXRecordDecl *BaseClassDecl
7713 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
7714 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl,
7715 ArgQuals, false, 0))
7716 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign);
7719 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
7720 BaseEnd = ClassDecl->vbases_end();
7721 Base != BaseEnd; ++Base) {
7722 CXXRecordDecl *BaseClassDecl
7723 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
7724 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl,
7725 ArgQuals, false, 0))
7726 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign);
7729 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
7730 FieldEnd = ClassDecl->field_end();
7733 QualType FieldType = Context.getBaseElementType(Field->getType());
7734 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
7735 if (CXXMethodDecl *CopyAssign =
7736 LookupCopyingAssignment(FieldClassDecl,
7737 ArgQuals | FieldType.getCVRQualifiers(),
7739 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign);
7746 CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) {
7747 // Note: The following rules are largely analoguous to the copy
7748 // constructor rules. Note that virtual bases are not taken into account
7749 // for determining the argument type of the operator. Note also that
7750 // operators taking an object instead of a reference are allowed.
7752 QualType ArgType = Context.getTypeDeclType(ClassDecl);
7753 QualType RetType = Context.getLValueReferenceType(ArgType);
7754 if (isImplicitCopyAssignmentArgConst(*this, ClassDecl))
7755 ArgType = ArgType.withConst();
7756 ArgType = Context.getLValueReferenceType(ArgType);
7758 // An implicitly-declared copy assignment operator is an inline public
7759 // member of its class.
7760 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
7761 SourceLocation ClassLoc = ClassDecl->getLocation();
7762 DeclarationNameInfo NameInfo(Name, ClassLoc);
7763 CXXMethodDecl *CopyAssignment
7764 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(),
7765 /*TInfo=*/0, /*isStatic=*/false,
7766 /*StorageClassAsWritten=*/SC_None,
7767 /*isInline=*/true, /*isConstexpr=*/false,
7769 CopyAssignment->setAccess(AS_public);
7770 CopyAssignment->setDefaulted();
7771 CopyAssignment->setImplicit();
7772 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment());
7774 // Build an exception specification pointing back at this member.
7775 FunctionProtoType::ExtProtoInfo EPI;
7776 EPI.ExceptionSpecType = EST_Unevaluated;
7777 EPI.ExceptionSpecDecl = CopyAssignment;
7778 CopyAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI));
7780 // Add the parameter to the operator.
7781 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment,
7782 ClassLoc, ClassLoc, /*Id=*/0,
7783 ArgType, /*TInfo=*/0,
7786 CopyAssignment->setParams(FromParam);
7788 // Note that we have added this copy-assignment operator.
7789 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared;
7791 if (Scope *S = getScopeForContext(ClassDecl))
7792 PushOnScopeChains(CopyAssignment, S, false);
7793 ClassDecl->addDecl(CopyAssignment);
7795 // C++0x [class.copy]p19:
7796 // .... If the class definition does not explicitly declare a copy
7797 // assignment operator, there is no user-declared move constructor, and
7798 // there is no user-declared move assignment operator, a copy assignment
7799 // operator is implicitly declared as defaulted.
7800 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment))
7801 CopyAssignment->setDeletedAsWritten();
7803 AddOverriddenMethods(ClassDecl, CopyAssignment);
7804 return CopyAssignment;
7807 void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation,
7808 CXXMethodDecl *CopyAssignOperator) {
7809 assert((CopyAssignOperator->isDefaulted() &&
7810 CopyAssignOperator->isOverloadedOperator() &&
7811 CopyAssignOperator->getOverloadedOperator() == OO_Equal &&
7812 !CopyAssignOperator->doesThisDeclarationHaveABody() &&
7813 !CopyAssignOperator->isDeleted()) &&
7814 "DefineImplicitCopyAssignment called for wrong function");
7816 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent();
7818 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) {
7819 CopyAssignOperator->setInvalidDecl();
7823 CopyAssignOperator->setUsed();
7825 SynthesizedFunctionScope Scope(*this, CopyAssignOperator);
7826 DiagnosticErrorTrap Trap(Diags);
7828 // C++0x [class.copy]p30:
7829 // The implicitly-defined or explicitly-defaulted copy assignment operator
7830 // for a non-union class X performs memberwise copy assignment of its
7831 // subobjects. The direct base classes of X are assigned first, in the
7832 // order of their declaration in the base-specifier-list, and then the
7833 // immediate non-static data members of X are assigned, in the order in
7834 // which they were declared in the class definition.
7836 // The statements that form the synthesized function body.
7837 SmallVector<Stmt*, 8> Statements;
7839 // The parameter for the "other" object, which we are copying from.
7840 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0);
7841 Qualifiers OtherQuals = Other->getType().getQualifiers();
7842 QualType OtherRefType = Other->getType();
7843 if (const LValueReferenceType *OtherRef
7844 = OtherRefType->getAs<LValueReferenceType>()) {
7845 OtherRefType = OtherRef->getPointeeType();
7846 OtherQuals = OtherRefType.getQualifiers();
7849 // Our location for everything implicitly-generated.
7850 SourceLocation Loc = CopyAssignOperator->getLocation();
7852 // Construct a reference to the "other" object. We'll be using this
7853 // throughout the generated ASTs.
7854 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take();
7855 assert(OtherRef && "Reference to parameter cannot fail!");
7857 // Construct the "this" pointer. We'll be using this throughout the generated
7859 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>();
7860 assert(This && "Reference to this cannot fail!");
7862 // Assign base classes.
7863 bool Invalid = false;
7864 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
7865 E = ClassDecl->bases_end(); Base != E; ++Base) {
7866 // Form the assignment:
7867 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other));
7868 QualType BaseType = Base->getType().getUnqualifiedType();
7869 if (!BaseType->isRecordType()) {
7874 CXXCastPath BasePath;
7875 BasePath.push_back(Base);
7877 // Construct the "from" expression, which is an implicit cast to the
7878 // appropriately-qualified base type.
7879 Expr *From = OtherRef;
7880 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals),
7881 CK_UncheckedDerivedToBase,
7882 VK_LValue, &BasePath).take();
7884 // Dereference "this".
7885 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This);
7887 // Implicitly cast "this" to the appropriately-qualified base type.
7888 To = ImpCastExprToType(To.take(),
7889 Context.getCVRQualifiedType(BaseType,
7890 CopyAssignOperator->getTypeQualifiers()),
7891 CK_UncheckedDerivedToBase,
7892 VK_LValue, &BasePath);
7895 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType,
7897 /*CopyingBaseSubobject=*/true,
7899 if (Copy.isInvalid()) {
7900 Diag(CurrentLocation, diag::note_member_synthesized_at)
7901 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
7902 CopyAssignOperator->setInvalidDecl();
7906 // Success! Record the copy.
7907 Statements.push_back(Copy.takeAs<Expr>());
7910 // \brief Reference to the __builtin_memcpy function.
7911 Expr *BuiltinMemCpyRef = 0;
7912 // \brief Reference to the __builtin_objc_memmove_collectable function.
7913 Expr *CollectableMemCpyRef = 0;
7915 // Assign non-static members.
7916 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
7917 FieldEnd = ClassDecl->field_end();
7918 Field != FieldEnd; ++Field) {
7919 if (Field->isUnnamedBitfield())
7922 // Check for members of reference type; we can't copy those.
7923 if (Field->getType()->isReferenceType()) {
7924 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
7925 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
7926 Diag(Field->getLocation(), diag::note_declared_at);
7927 Diag(CurrentLocation, diag::note_member_synthesized_at)
7928 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
7933 // Check for members of const-qualified, non-class type.
7934 QualType BaseType = Context.getBaseElementType(Field->getType());
7935 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
7936 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
7937 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
7938 Diag(Field->getLocation(), diag::note_declared_at);
7939 Diag(CurrentLocation, diag::note_member_synthesized_at)
7940 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
7945 // Suppress assigning zero-width bitfields.
7946 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0)
7949 QualType FieldType = Field->getType().getNonReferenceType();
7950 if (FieldType->isIncompleteArrayType()) {
7951 assert(ClassDecl->hasFlexibleArrayMember() &&
7952 "Incomplete array type is not valid");
7956 // Build references to the field in the object we're copying from and to.
7957 CXXScopeSpec SS; // Intentionally empty
7958 LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
7960 MemberLookup.addDecl(*Field);
7961 MemberLookup.resolveKind();
7962 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType,
7963 Loc, /*IsArrow=*/false,
7964 SS, SourceLocation(), 0,
7966 ExprResult To = BuildMemberReferenceExpr(This, This->getType(),
7967 Loc, /*IsArrow=*/true,
7968 SS, SourceLocation(), 0,
7970 assert(!From.isInvalid() && "Implicit field reference cannot fail");
7971 assert(!To.isInvalid() && "Implicit field reference cannot fail");
7973 // If the field should be copied with __builtin_memcpy rather than via
7974 // explicit assignments, do so. This optimization only applies for arrays
7975 // of scalars and arrays of class type with trivial copy-assignment
7977 if (FieldType->isArrayType() && !FieldType.isVolatileQualified()
7978 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) {
7979 // Compute the size of the memory buffer to be copied.
7980 QualType SizeType = Context.getSizeType();
7981 llvm::APInt Size(Context.getTypeSize(SizeType),
7982 Context.getTypeSizeInChars(BaseType).getQuantity());
7983 for (const ConstantArrayType *Array
7984 = Context.getAsConstantArrayType(FieldType);
7986 Array = Context.getAsConstantArrayType(Array->getElementType())) {
7987 llvm::APInt ArraySize
7988 = Array->getSize().zextOrTrunc(Size.getBitWidth());
7992 // Take the address of the field references for "from" and "to".
7993 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get());
7994 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get());
7996 bool NeedsCollectableMemCpy =
7997 (BaseType->isRecordType() &&
7998 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember());
8000 if (NeedsCollectableMemCpy) {
8001 if (!CollectableMemCpyRef) {
8002 // Create a reference to the __builtin_objc_memmove_collectable function.
8003 LookupResult R(*this,
8004 &Context.Idents.get("__builtin_objc_memmove_collectable"),
8005 Loc, LookupOrdinaryName);
8006 LookupName(R, TUScope, true);
8008 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>();
8009 if (!CollectableMemCpy) {
8010 // Something went horribly wrong earlier, and we will have
8011 // complained about it.
8016 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy,
8017 Context.BuiltinFnTy,
8018 VK_RValue, Loc, 0).take();
8019 assert(CollectableMemCpyRef && "Builtin reference cannot fail");
8022 // Create a reference to the __builtin_memcpy builtin function.
8023 else if (!BuiltinMemCpyRef) {
8024 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc,
8025 LookupOrdinaryName);
8026 LookupName(R, TUScope, true);
8028 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>();
8029 if (!BuiltinMemCpy) {
8030 // Something went horribly wrong earlier, and we will have complained
8036 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy,
8037 Context.BuiltinFnTy,
8038 VK_RValue, Loc, 0).take();
8039 assert(BuiltinMemCpyRef && "Builtin reference cannot fail");
8042 SmallVector<Expr*, 8> CallArgs;
8043 CallArgs.push_back(To.takeAs<Expr>());
8044 CallArgs.push_back(From.takeAs<Expr>());
8045 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc));
8046 ExprResult Call = ExprError();
8047 if (NeedsCollectableMemCpy)
8048 Call = ActOnCallExpr(/*Scope=*/0,
8049 CollectableMemCpyRef,
8053 Call = ActOnCallExpr(/*Scope=*/0,
8058 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!");
8059 Statements.push_back(Call.takeAs<Expr>());
8063 // Build the copy of this field.
8064 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType,
8065 To.get(), From.get(),
8066 /*CopyingBaseSubobject=*/false,
8068 if (Copy.isInvalid()) {
8069 Diag(CurrentLocation, diag::note_member_synthesized_at)
8070 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
8071 CopyAssignOperator->setInvalidDecl();
8075 // Success! Record the copy.
8076 Statements.push_back(Copy.takeAs<Stmt>());
8080 // Add a "return *this;"
8081 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This);
8083 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get());
8084 if (Return.isInvalid())
8087 Statements.push_back(Return.takeAs<Stmt>());
8089 if (Trap.hasErrorOccurred()) {
8090 Diag(CurrentLocation, diag::note_member_synthesized_at)
8091 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
8098 CopyAssignOperator->setInvalidDecl();
8104 CompoundScopeRAII CompoundScope(*this);
8105 Body = ActOnCompoundStmt(Loc, Loc, Statements,
8106 /*isStmtExpr=*/false);
8107 assert(!Body.isInvalid() && "Compound statement creation cannot fail");
8109 CopyAssignOperator->setBody(Body.takeAs<Stmt>());
8111 if (ASTMutationListener *L = getASTMutationListener()) {
8112 L->CompletedImplicitDefinition(CopyAssignOperator);
8116 Sema::ImplicitExceptionSpecification
8117 Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) {
8118 CXXRecordDecl *ClassDecl = MD->getParent();
8120 ImplicitExceptionSpecification ExceptSpec(*this);
8121 if (ClassDecl->isInvalidDecl())
8124 // C++0x [except.spec]p14:
8125 // An implicitly declared special member function (Clause 12) shall have an
8126 // exception-specification. [...]
8128 // It is unspecified whether or not an implicit move assignment operator
8129 // attempts to deduplicate calls to assignment operators of virtual bases are
8130 // made. As such, this exception specification is effectively unspecified.
8131 // Based on a similar decision made for constness in C++0x, we're erring on
8132 // the side of assuming such calls to be made regardless of whether they
8134 // Note that a move constructor is not implicitly declared when there are
8135 // virtual bases, but it can still be user-declared and explicitly defaulted.
8136 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
8137 BaseEnd = ClassDecl->bases_end();
8138 Base != BaseEnd; ++Base) {
8139 if (Base->isVirtual())
8142 CXXRecordDecl *BaseClassDecl
8143 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8144 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl,
8146 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign);
8149 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
8150 BaseEnd = ClassDecl->vbases_end();
8151 Base != BaseEnd; ++Base) {
8152 CXXRecordDecl *BaseClassDecl
8153 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8154 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl,
8156 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign);
8159 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
8160 FieldEnd = ClassDecl->field_end();
8163 QualType FieldType = Context.getBaseElementType(Field->getType());
8164 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
8165 if (CXXMethodDecl *MoveAssign =
8166 LookupMovingAssignment(FieldClassDecl,
8167 FieldType.getCVRQualifiers(),
8169 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign);
8176 /// Determine whether the class type has any direct or indirect virtual base
8177 /// classes which have a non-trivial move assignment operator.
8179 hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) {
8180 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
8181 BaseEnd = ClassDecl->vbases_end();
8182 Base != BaseEnd; ++Base) {
8183 CXXRecordDecl *BaseClass =
8184 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8186 // Try to declare the move assignment. If it would be deleted, then the
8187 // class does not have a non-trivial move assignment.
8188 if (BaseClass->needsImplicitMoveAssignment())
8189 S.DeclareImplicitMoveAssignment(BaseClass);
8191 // If the class has both a trivial move assignment and a non-trivial move
8192 // assignment, hasTrivialMoveAssignment() is false.
8193 if (BaseClass->hasDeclaredMoveAssignment() &&
8194 !BaseClass->hasTrivialMoveAssignment())
8201 /// Determine whether the given type either has a move constructor or is
8202 /// trivially copyable.
8204 hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) {
8205 Type = S.Context.getBaseElementType(Type);
8207 // FIXME: Technically, non-trivially-copyable non-class types, such as
8208 // reference types, are supposed to return false here, but that appears
8209 // to be a standard defect.
8210 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl();
8211 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl())
8214 if (Type.isTriviallyCopyableType(S.Context))
8217 if (IsConstructor) {
8218 if (ClassDecl->needsImplicitMoveConstructor())
8219 S.DeclareImplicitMoveConstructor(ClassDecl);
8220 return ClassDecl->hasDeclaredMoveConstructor();
8223 if (ClassDecl->needsImplicitMoveAssignment())
8224 S.DeclareImplicitMoveAssignment(ClassDecl);
8225 return ClassDecl->hasDeclaredMoveAssignment();
8228 /// Determine whether all non-static data members and direct or virtual bases
8229 /// of class \p ClassDecl have either a move operation, or are trivially
8231 static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl,
8232 bool IsConstructor) {
8233 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
8234 BaseEnd = ClassDecl->bases_end();
8235 Base != BaseEnd; ++Base) {
8236 if (Base->isVirtual())
8239 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor))
8243 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
8244 BaseEnd = ClassDecl->vbases_end();
8245 Base != BaseEnd; ++Base) {
8246 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor))
8250 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
8251 FieldEnd = ClassDecl->field_end();
8252 Field != FieldEnd; ++Field) {
8253 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor))
8260 CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) {
8261 // C++11 [class.copy]p20:
8262 // If the definition of a class X does not explicitly declare a move
8263 // assignment operator, one will be implicitly declared as defaulted
8266 // - [first 4 bullets]
8267 assert(ClassDecl->needsImplicitMoveAssignment());
8269 // [Checked after we build the declaration]
8270 // - the move assignment operator would not be implicitly defined as
8274 // - X has no direct or indirect virtual base class with a non-trivial
8275 // move assignment operator, and
8276 // - each of X's non-static data members and direct or virtual base classes
8277 // has a type that either has a move assignment operator or is trivially
8279 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) ||
8280 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) {
8281 ClassDecl->setFailedImplicitMoveAssignment();
8285 // Note: The following rules are largely analoguous to the move
8286 // constructor rules.
8288 QualType ArgType = Context.getTypeDeclType(ClassDecl);
8289 QualType RetType = Context.getLValueReferenceType(ArgType);
8290 ArgType = Context.getRValueReferenceType(ArgType);
8292 // An implicitly-declared move assignment operator is an inline public
8293 // member of its class.
8294 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
8295 SourceLocation ClassLoc = ClassDecl->getLocation();
8296 DeclarationNameInfo NameInfo(Name, ClassLoc);
8297 CXXMethodDecl *MoveAssignment
8298 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(),
8299 /*TInfo=*/0, /*isStatic=*/false,
8300 /*StorageClassAsWritten=*/SC_None,
8302 /*isConstexpr=*/false,
8304 MoveAssignment->setAccess(AS_public);
8305 MoveAssignment->setDefaulted();
8306 MoveAssignment->setImplicit();
8307 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment());
8309 // Build an exception specification pointing back at this member.
8310 FunctionProtoType::ExtProtoInfo EPI;
8311 EPI.ExceptionSpecType = EST_Unevaluated;
8312 EPI.ExceptionSpecDecl = MoveAssignment;
8313 MoveAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI));
8315 // Add the parameter to the operator.
8316 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment,
8317 ClassLoc, ClassLoc, /*Id=*/0,
8318 ArgType, /*TInfo=*/0,
8321 MoveAssignment->setParams(FromParam);
8323 // Note that we have added this copy-assignment operator.
8324 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared;
8326 // C++0x [class.copy]p9:
8327 // If the definition of a class X does not explicitly declare a move
8328 // assignment operator, one will be implicitly declared as defaulted if and
8331 // - the move assignment operator would not be implicitly defined as
8333 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) {
8334 // Cache this result so that we don't try to generate this over and over
8335 // on every lookup, leaking memory and wasting time.
8336 ClassDecl->setFailedImplicitMoveAssignment();
8340 if (Scope *S = getScopeForContext(ClassDecl))
8341 PushOnScopeChains(MoveAssignment, S, false);
8342 ClassDecl->addDecl(MoveAssignment);
8344 AddOverriddenMethods(ClassDecl, MoveAssignment);
8345 return MoveAssignment;
8348 void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation,
8349 CXXMethodDecl *MoveAssignOperator) {
8350 assert((MoveAssignOperator->isDefaulted() &&
8351 MoveAssignOperator->isOverloadedOperator() &&
8352 MoveAssignOperator->getOverloadedOperator() == OO_Equal &&
8353 !MoveAssignOperator->doesThisDeclarationHaveABody() &&
8354 !MoveAssignOperator->isDeleted()) &&
8355 "DefineImplicitMoveAssignment called for wrong function");
8357 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent();
8359 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) {
8360 MoveAssignOperator->setInvalidDecl();
8364 MoveAssignOperator->setUsed();
8366 SynthesizedFunctionScope Scope(*this, MoveAssignOperator);
8367 DiagnosticErrorTrap Trap(Diags);
8369 // C++0x [class.copy]p28:
8370 // The implicitly-defined or move assignment operator for a non-union class
8371 // X performs memberwise move assignment of its subobjects. The direct base
8372 // classes of X are assigned first, in the order of their declaration in the
8373 // base-specifier-list, and then the immediate non-static data members of X
8374 // are assigned, in the order in which they were declared in the class
8377 // The statements that form the synthesized function body.
8378 SmallVector<Stmt*, 8> Statements;
8380 // The parameter for the "other" object, which we are move from.
8381 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0);
8382 QualType OtherRefType = Other->getType()->
8383 getAs<RValueReferenceType>()->getPointeeType();
8384 assert(OtherRefType.getQualifiers() == 0 &&
8385 "Bad argument type of defaulted move assignment");
8387 // Our location for everything implicitly-generated.
8388 SourceLocation Loc = MoveAssignOperator->getLocation();
8390 // Construct a reference to the "other" object. We'll be using this
8391 // throughout the generated ASTs.
8392 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take();
8393 assert(OtherRef && "Reference to parameter cannot fail!");
8395 OtherRef = CastForMoving(*this, OtherRef);
8397 // Construct the "this" pointer. We'll be using this throughout the generated
8399 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>();
8400 assert(This && "Reference to this cannot fail!");
8402 // Assign base classes.
8403 bool Invalid = false;
8404 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
8405 E = ClassDecl->bases_end(); Base != E; ++Base) {
8406 // Form the assignment:
8407 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other));
8408 QualType BaseType = Base->getType().getUnqualifiedType();
8409 if (!BaseType->isRecordType()) {
8414 CXXCastPath BasePath;
8415 BasePath.push_back(Base);
8417 // Construct the "from" expression, which is an implicit cast to the
8418 // appropriately-qualified base type.
8419 Expr *From = OtherRef;
8420 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase,
8421 VK_XValue, &BasePath).take();
8423 // Dereference "this".
8424 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This);
8426 // Implicitly cast "this" to the appropriately-qualified base type.
8427 To = ImpCastExprToType(To.take(),
8428 Context.getCVRQualifiedType(BaseType,
8429 MoveAssignOperator->getTypeQualifiers()),
8430 CK_UncheckedDerivedToBase,
8431 VK_LValue, &BasePath);
8434 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType,
8436 /*CopyingBaseSubobject=*/true,
8438 if (Move.isInvalid()) {
8439 Diag(CurrentLocation, diag::note_member_synthesized_at)
8440 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
8441 MoveAssignOperator->setInvalidDecl();
8445 // Success! Record the move.
8446 Statements.push_back(Move.takeAs<Expr>());
8449 // \brief Reference to the __builtin_memcpy function.
8450 Expr *BuiltinMemCpyRef = 0;
8451 // \brief Reference to the __builtin_objc_memmove_collectable function.
8452 Expr *CollectableMemCpyRef = 0;
8454 // Assign non-static members.
8455 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
8456 FieldEnd = ClassDecl->field_end();
8457 Field != FieldEnd; ++Field) {
8458 if (Field->isUnnamedBitfield())
8461 // Check for members of reference type; we can't move those.
8462 if (Field->getType()->isReferenceType()) {
8463 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
8464 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
8465 Diag(Field->getLocation(), diag::note_declared_at);
8466 Diag(CurrentLocation, diag::note_member_synthesized_at)
8467 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
8472 // Check for members of const-qualified, non-class type.
8473 QualType BaseType = Context.getBaseElementType(Field->getType());
8474 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
8475 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
8476 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
8477 Diag(Field->getLocation(), diag::note_declared_at);
8478 Diag(CurrentLocation, diag::note_member_synthesized_at)
8479 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
8484 // Suppress assigning zero-width bitfields.
8485 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0)
8488 QualType FieldType = Field->getType().getNonReferenceType();
8489 if (FieldType->isIncompleteArrayType()) {
8490 assert(ClassDecl->hasFlexibleArrayMember() &&
8491 "Incomplete array type is not valid");
8495 // Build references to the field in the object we're copying from and to.
8496 CXXScopeSpec SS; // Intentionally empty
8497 LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
8499 MemberLookup.addDecl(*Field);
8500 MemberLookup.resolveKind();
8501 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType,
8502 Loc, /*IsArrow=*/false,
8503 SS, SourceLocation(), 0,
8505 ExprResult To = BuildMemberReferenceExpr(This, This->getType(),
8506 Loc, /*IsArrow=*/true,
8507 SS, SourceLocation(), 0,
8509 assert(!From.isInvalid() && "Implicit field reference cannot fail");
8510 assert(!To.isInvalid() && "Implicit field reference cannot fail");
8512 assert(!From.get()->isLValue() && // could be xvalue or prvalue
8513 "Member reference with rvalue base must be rvalue except for reference "
8514 "members, which aren't allowed for move assignment.");
8516 // If the field should be copied with __builtin_memcpy rather than via
8517 // explicit assignments, do so. This optimization only applies for arrays
8518 // of scalars and arrays of class type with trivial move-assignment
8520 if (FieldType->isArrayType() && !FieldType.isVolatileQualified()
8521 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) {
8522 // Compute the size of the memory buffer to be copied.
8523 QualType SizeType = Context.getSizeType();
8524 llvm::APInt Size(Context.getTypeSize(SizeType),
8525 Context.getTypeSizeInChars(BaseType).getQuantity());
8526 for (const ConstantArrayType *Array
8527 = Context.getAsConstantArrayType(FieldType);
8529 Array = Context.getAsConstantArrayType(Array->getElementType())) {
8530 llvm::APInt ArraySize
8531 = Array->getSize().zextOrTrunc(Size.getBitWidth());
8535 // Take the address of the field references for "from" and "to". We
8536 // directly construct UnaryOperators here because semantic analysis
8537 // does not permit us to take the address of an xvalue.
8538 From = new (Context) UnaryOperator(From.get(), UO_AddrOf,
8539 Context.getPointerType(From.get()->getType()),
8540 VK_RValue, OK_Ordinary, Loc);
8541 To = new (Context) UnaryOperator(To.get(), UO_AddrOf,
8542 Context.getPointerType(To.get()->getType()),
8543 VK_RValue, OK_Ordinary, Loc);
8545 bool NeedsCollectableMemCpy =
8546 (BaseType->isRecordType() &&
8547 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember());
8549 if (NeedsCollectableMemCpy) {
8550 if (!CollectableMemCpyRef) {
8551 // Create a reference to the __builtin_objc_memmove_collectable function.
8552 LookupResult R(*this,
8553 &Context.Idents.get("__builtin_objc_memmove_collectable"),
8554 Loc, LookupOrdinaryName);
8555 LookupName(R, TUScope, true);
8557 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>();
8558 if (!CollectableMemCpy) {
8559 // Something went horribly wrong earlier, and we will have
8560 // complained about it.
8565 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy,
8566 Context.BuiltinFnTy,
8567 VK_RValue, Loc, 0).take();
8568 assert(CollectableMemCpyRef && "Builtin reference cannot fail");
8571 // Create a reference to the __builtin_memcpy builtin function.
8572 else if (!BuiltinMemCpyRef) {
8573 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc,
8574 LookupOrdinaryName);
8575 LookupName(R, TUScope, true);
8577 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>();
8578 if (!BuiltinMemCpy) {
8579 // Something went horribly wrong earlier, and we will have complained
8585 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy,
8586 Context.BuiltinFnTy,
8587 VK_RValue, Loc, 0).take();
8588 assert(BuiltinMemCpyRef && "Builtin reference cannot fail");
8591 SmallVector<Expr*, 8> CallArgs;
8592 CallArgs.push_back(To.takeAs<Expr>());
8593 CallArgs.push_back(From.takeAs<Expr>());
8594 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc));
8595 ExprResult Call = ExprError();
8596 if (NeedsCollectableMemCpy)
8597 Call = ActOnCallExpr(/*Scope=*/0,
8598 CollectableMemCpyRef,
8602 Call = ActOnCallExpr(/*Scope=*/0,
8607 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!");
8608 Statements.push_back(Call.takeAs<Expr>());
8612 // Build the move of this field.
8613 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType,
8614 To.get(), From.get(),
8615 /*CopyingBaseSubobject=*/false,
8617 if (Move.isInvalid()) {
8618 Diag(CurrentLocation, diag::note_member_synthesized_at)
8619 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
8620 MoveAssignOperator->setInvalidDecl();
8624 // Success! Record the copy.
8625 Statements.push_back(Move.takeAs<Stmt>());
8629 // Add a "return *this;"
8630 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This);
8632 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get());
8633 if (Return.isInvalid())
8636 Statements.push_back(Return.takeAs<Stmt>());
8638 if (Trap.hasErrorOccurred()) {
8639 Diag(CurrentLocation, diag::note_member_synthesized_at)
8640 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
8647 MoveAssignOperator->setInvalidDecl();
8653 CompoundScopeRAII CompoundScope(*this);
8654 Body = ActOnCompoundStmt(Loc, Loc, Statements,
8655 /*isStmtExpr=*/false);
8656 assert(!Body.isInvalid() && "Compound statement creation cannot fail");
8658 MoveAssignOperator->setBody(Body.takeAs<Stmt>());
8660 if (ASTMutationListener *L = getASTMutationListener()) {
8661 L->CompletedImplicitDefinition(MoveAssignOperator);
8665 /// Determine whether an implicit copy constructor for ClassDecl has a const
8667 /// FIXME: It ought to be possible to store this on the record.
8668 static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl) {
8669 if (ClassDecl->isInvalidDecl())
8672 // C++ [class.copy]p5:
8673 // The implicitly-declared copy constructor for a class X will
8679 // -- each direct or virtual base class B of X has a copy
8680 // constructor whose first parameter is of type const B& or
8681 // const volatile B&, and
8682 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
8683 BaseEnd = ClassDecl->bases_end();
8684 Base != BaseEnd; ++Base) {
8685 // Virtual bases are handled below.
8686 if (Base->isVirtual())
8689 CXXRecordDecl *BaseClassDecl
8690 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8691 // FIXME: This lookup is wrong. If the copy ctor for a member or base is
8692 // ambiguous, we should still produce a constructor with a const-qualified
8694 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const))
8698 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
8699 BaseEnd = ClassDecl->vbases_end();
8700 Base != BaseEnd; ++Base) {
8701 CXXRecordDecl *BaseClassDecl
8702 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8703 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const))
8707 // -- for all the nonstatic data members of X that are of a
8708 // class type M (or array thereof), each such class type
8709 // has a copy constructor whose first parameter is of type
8710 // const M& or const volatile M&.
8711 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
8712 FieldEnd = ClassDecl->field_end();
8713 Field != FieldEnd; ++Field) {
8714 QualType FieldType = S.Context.getBaseElementType(Field->getType());
8715 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
8716 if (!S.LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const))
8721 // Otherwise, the implicitly declared copy constructor will have
8729 Sema::ImplicitExceptionSpecification
8730 Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) {
8731 CXXRecordDecl *ClassDecl = MD->getParent();
8733 ImplicitExceptionSpecification ExceptSpec(*this);
8734 if (ClassDecl->isInvalidDecl())
8737 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>();
8738 assert(T->getNumArgs() >= 1 && "not a copy ctor");
8739 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers();
8741 // C++ [except.spec]p14:
8742 // An implicitly declared special member function (Clause 12) shall have an
8743 // exception-specification. [...]
8744 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
8745 BaseEnd = ClassDecl->bases_end();
8748 // Virtual bases are handled below.
8749 if (Base->isVirtual())
8752 CXXRecordDecl *BaseClassDecl
8753 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8754 if (CXXConstructorDecl *CopyConstructor =
8755 LookupCopyingConstructor(BaseClassDecl, Quals))
8756 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor);
8758 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
8759 BaseEnd = ClassDecl->vbases_end();
8762 CXXRecordDecl *BaseClassDecl
8763 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8764 if (CXXConstructorDecl *CopyConstructor =
8765 LookupCopyingConstructor(BaseClassDecl, Quals))
8766 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor);
8768 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
8769 FieldEnd = ClassDecl->field_end();
8772 QualType FieldType = Context.getBaseElementType(Field->getType());
8773 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
8774 if (CXXConstructorDecl *CopyConstructor =
8775 LookupCopyingConstructor(FieldClassDecl,
8776 Quals | FieldType.getCVRQualifiers()))
8777 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor);
8784 CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor(
8785 CXXRecordDecl *ClassDecl) {
8786 // C++ [class.copy]p4:
8787 // If the class definition does not explicitly declare a copy
8788 // constructor, one is declared implicitly.
8790 QualType ClassType = Context.getTypeDeclType(ClassDecl);
8791 QualType ArgType = ClassType;
8792 bool Const = isImplicitCopyCtorArgConst(*this, ClassDecl);
8794 ArgType = ArgType.withConst();
8795 ArgType = Context.getLValueReferenceType(ArgType);
8797 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
8801 DeclarationName Name
8802 = Context.DeclarationNames.getCXXConstructorName(
8803 Context.getCanonicalType(ClassType));
8804 SourceLocation ClassLoc = ClassDecl->getLocation();
8805 DeclarationNameInfo NameInfo(Name, ClassLoc);
8807 // An implicitly-declared copy constructor is an inline public
8808 // member of its class.
8809 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create(
8810 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0,
8811 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true,
8813 CopyConstructor->setAccess(AS_public);
8814 CopyConstructor->setDefaulted();
8815 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor());
8817 // Build an exception specification pointing back at this member.
8818 FunctionProtoType::ExtProtoInfo EPI;
8819 EPI.ExceptionSpecType = EST_Unevaluated;
8820 EPI.ExceptionSpecDecl = CopyConstructor;
8821 CopyConstructor->setType(
8822 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI));
8824 // Note that we have declared this constructor.
8825 ++ASTContext::NumImplicitCopyConstructorsDeclared;
8827 // Add the parameter to the constructor.
8828 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor,
8830 /*IdentifierInfo=*/0,
8831 ArgType, /*TInfo=*/0,
8834 CopyConstructor->setParams(FromParam);
8836 if (Scope *S = getScopeForContext(ClassDecl))
8837 PushOnScopeChains(CopyConstructor, S, false);
8838 ClassDecl->addDecl(CopyConstructor);
8840 // C++11 [class.copy]p8:
8841 // ... If the class definition does not explicitly declare a copy
8842 // constructor, there is no user-declared move constructor, and there is no
8843 // user-declared move assignment operator, a copy constructor is implicitly
8844 // declared as defaulted.
8845 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor))
8846 CopyConstructor->setDeletedAsWritten();
8848 return CopyConstructor;
8851 void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
8852 CXXConstructorDecl *CopyConstructor) {
8853 assert((CopyConstructor->isDefaulted() &&
8854 CopyConstructor->isCopyConstructor() &&
8855 !CopyConstructor->doesThisDeclarationHaveABody() &&
8856 !CopyConstructor->isDeleted()) &&
8857 "DefineImplicitCopyConstructor - call it for implicit copy ctor");
8859 CXXRecordDecl *ClassDecl = CopyConstructor->getParent();
8860 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor");
8862 SynthesizedFunctionScope Scope(*this, CopyConstructor);
8863 DiagnosticErrorTrap Trap(Diags);
8865 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) ||
8866 Trap.hasErrorOccurred()) {
8867 Diag(CurrentLocation, diag::note_member_synthesized_at)
8868 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl);
8869 CopyConstructor->setInvalidDecl();
8871 Sema::CompoundScopeRAII CompoundScope(*this);
8872 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(),
8873 CopyConstructor->getLocation(),
8875 /*isStmtExpr=*/false)
8877 CopyConstructor->setImplicitlyDefined(true);
8880 CopyConstructor->setUsed();
8881 if (ASTMutationListener *L = getASTMutationListener()) {
8882 L->CompletedImplicitDefinition(CopyConstructor);
8886 Sema::ImplicitExceptionSpecification
8887 Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) {
8888 CXXRecordDecl *ClassDecl = MD->getParent();
8890 // C++ [except.spec]p14:
8891 // An implicitly declared special member function (Clause 12) shall have an
8892 // exception-specification. [...]
8893 ImplicitExceptionSpecification ExceptSpec(*this);
8894 if (ClassDecl->isInvalidDecl())
8897 // Direct base-class constructors.
8898 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
8899 BEnd = ClassDecl->bases_end();
8901 if (B->isVirtual()) // Handled below.
8904 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
8905 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
8906 CXXConstructorDecl *Constructor =
8907 LookupMovingConstructor(BaseClassDecl, 0);
8908 // If this is a deleted function, add it anyway. This might be conformant
8909 // with the standard. This might not. I'm not sure. It might not matter.
8911 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
8915 // Virtual base-class constructors.
8916 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
8917 BEnd = ClassDecl->vbases_end();
8919 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
8920 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
8921 CXXConstructorDecl *Constructor =
8922 LookupMovingConstructor(BaseClassDecl, 0);
8923 // If this is a deleted function, add it anyway. This might be conformant
8924 // with the standard. This might not. I'm not sure. It might not matter.
8926 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
8930 // Field constructors.
8931 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
8932 FEnd = ClassDecl->field_end();
8934 QualType FieldType = Context.getBaseElementType(F->getType());
8935 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) {
8936 CXXConstructorDecl *Constructor =
8937 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers());
8938 // If this is a deleted function, add it anyway. This might be conformant
8939 // with the standard. This might not. I'm not sure. It might not matter.
8940 // In particular, the problem is that this function never gets called. It
8941 // might just be ill-formed because this function attempts to refer to
8942 // a deleted function here.
8944 ExceptSpec.CalledDecl(F->getLocation(), Constructor);
8951 CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor(
8952 CXXRecordDecl *ClassDecl) {
8953 // C++11 [class.copy]p9:
8954 // If the definition of a class X does not explicitly declare a move
8955 // constructor, one will be implicitly declared as defaulted if and only if:
8957 // - [first 4 bullets]
8958 assert(ClassDecl->needsImplicitMoveConstructor());
8960 // [Checked after we build the declaration]
8961 // - the move assignment operator would not be implicitly defined as
8965 // - each of X's non-static data members and direct or virtual base classes
8966 // has a type that either has a move constructor or is trivially copyable.
8967 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) {
8968 ClassDecl->setFailedImplicitMoveConstructor();
8972 QualType ClassType = Context.getTypeDeclType(ClassDecl);
8973 QualType ArgType = Context.getRValueReferenceType(ClassType);
8975 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
8979 DeclarationName Name
8980 = Context.DeclarationNames.getCXXConstructorName(
8981 Context.getCanonicalType(ClassType));
8982 SourceLocation ClassLoc = ClassDecl->getLocation();
8983 DeclarationNameInfo NameInfo(Name, ClassLoc);
8985 // C++0x [class.copy]p11:
8986 // An implicitly-declared copy/move constructor is an inline public
8987 // member of its class.
8988 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create(
8989 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0,
8990 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true,
8992 MoveConstructor->setAccess(AS_public);
8993 MoveConstructor->setDefaulted();
8994 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor());
8996 // Build an exception specification pointing back at this member.
8997 FunctionProtoType::ExtProtoInfo EPI;
8998 EPI.ExceptionSpecType = EST_Unevaluated;
8999 EPI.ExceptionSpecDecl = MoveConstructor;
9000 MoveConstructor->setType(
9001 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI));
9003 // Add the parameter to the constructor.
9004 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor,
9006 /*IdentifierInfo=*/0,
9007 ArgType, /*TInfo=*/0,
9010 MoveConstructor->setParams(FromParam);
9012 // C++0x [class.copy]p9:
9013 // If the definition of a class X does not explicitly declare a move
9014 // constructor, one will be implicitly declared as defaulted if and only if:
9016 // - the move constructor would not be implicitly defined as deleted.
9017 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) {
9018 // Cache this result so that we don't try to generate this over and over
9019 // on every lookup, leaking memory and wasting time.
9020 ClassDecl->setFailedImplicitMoveConstructor();
9024 // Note that we have declared this constructor.
9025 ++ASTContext::NumImplicitMoveConstructorsDeclared;
9027 if (Scope *S = getScopeForContext(ClassDecl))
9028 PushOnScopeChains(MoveConstructor, S, false);
9029 ClassDecl->addDecl(MoveConstructor);
9031 return MoveConstructor;
9034 void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation,
9035 CXXConstructorDecl *MoveConstructor) {
9036 assert((MoveConstructor->isDefaulted() &&
9037 MoveConstructor->isMoveConstructor() &&
9038 !MoveConstructor->doesThisDeclarationHaveABody() &&
9039 !MoveConstructor->isDeleted()) &&
9040 "DefineImplicitMoveConstructor - call it for implicit move ctor");
9042 CXXRecordDecl *ClassDecl = MoveConstructor->getParent();
9043 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor");
9045 SynthesizedFunctionScope Scope(*this, MoveConstructor);
9046 DiagnosticErrorTrap Trap(Diags);
9048 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) ||
9049 Trap.hasErrorOccurred()) {
9050 Diag(CurrentLocation, diag::note_member_synthesized_at)
9051 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl);
9052 MoveConstructor->setInvalidDecl();
9054 Sema::CompoundScopeRAII CompoundScope(*this);
9055 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(),
9056 MoveConstructor->getLocation(),
9058 /*isStmtExpr=*/false)
9060 MoveConstructor->setImplicitlyDefined(true);
9063 MoveConstructor->setUsed();
9065 if (ASTMutationListener *L = getASTMutationListener()) {
9066 L->CompletedImplicitDefinition(MoveConstructor);
9070 bool Sema::isImplicitlyDeleted(FunctionDecl *FD) {
9071 return FD->isDeleted() &&
9072 (FD->isDefaulted() || FD->isImplicit()) &&
9073 isa<CXXMethodDecl>(FD);
9076 /// \brief Mark the call operator of the given lambda closure type as "used".
9077 static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) {
9078 CXXMethodDecl *CallOperator
9079 = cast<CXXMethodDecl>(
9081 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first);
9082 CallOperator->setReferenced();
9083 CallOperator->setUsed();
9086 void Sema::DefineImplicitLambdaToFunctionPointerConversion(
9087 SourceLocation CurrentLocation,
9088 CXXConversionDecl *Conv)
9090 CXXRecordDecl *Lambda = Conv->getParent();
9092 // Make sure that the lambda call operator is marked used.
9093 markLambdaCallOperatorUsed(*this, Lambda);
9097 SynthesizedFunctionScope Scope(*this, Conv);
9098 DiagnosticErrorTrap Trap(Diags);
9100 // Return the address of the __invoke function.
9101 DeclarationName InvokeName = &Context.Idents.get("__invoke");
9102 CXXMethodDecl *Invoke
9103 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first);
9104 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(),
9105 VK_LValue, Conv->getLocation()).take();
9106 assert(FunctionRef && "Can't refer to __invoke function?");
9107 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take();
9108 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1,
9109 Conv->getLocation(),
9110 Conv->getLocation()));
9112 // Fill in the __invoke function with a dummy implementation. IR generation
9113 // will fill in the actual details.
9115 Invoke->setReferenced();
9116 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation()));
9118 if (ASTMutationListener *L = getASTMutationListener()) {
9119 L->CompletedImplicitDefinition(Conv);
9120 L->CompletedImplicitDefinition(Invoke);
9124 void Sema::DefineImplicitLambdaToBlockPointerConversion(
9125 SourceLocation CurrentLocation,
9126 CXXConversionDecl *Conv)
9130 SynthesizedFunctionScope Scope(*this, Conv);
9131 DiagnosticErrorTrap Trap(Diags);
9133 // Copy-initialize the lambda object as needed to capture it.
9134 Expr *This = ActOnCXXThis(CurrentLocation).take();
9135 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take();
9137 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation,
9138 Conv->getLocation(),
9141 // If we're not under ARC, make sure we still get the _Block_copy/autorelease
9142 // behavior. Note that only the general conversion function does this
9143 // (since it's unusable otherwise); in the case where we inline the
9144 // block literal, it has block literal lifetime semantics.
9145 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount)
9146 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(),
9147 CK_CopyAndAutoreleaseBlockObject,
9148 BuildBlock.get(), 0, VK_RValue);
9150 if (BuildBlock.isInvalid()) {
9151 Diag(CurrentLocation, diag::note_lambda_to_block_conv);
9152 Conv->setInvalidDecl();
9156 // Create the return statement that returns the block from the conversion
9158 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get());
9159 if (Return.isInvalid()) {
9160 Diag(CurrentLocation, diag::note_lambda_to_block_conv);
9161 Conv->setInvalidDecl();
9165 // Set the body of the conversion function.
9166 Stmt *ReturnS = Return.take();
9167 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1,
9168 Conv->getLocation(),
9169 Conv->getLocation()));
9171 // We're done; notify the mutation listener, if any.
9172 if (ASTMutationListener *L = getASTMutationListener()) {
9173 L->CompletedImplicitDefinition(Conv);
9177 /// \brief Determine whether the given list arguments contains exactly one
9178 /// "real" (non-default) argument.
9179 static bool hasOneRealArgument(MultiExprArg Args) {
9180 switch (Args.size()) {
9185 if (!Args[1]->isDefaultArgument())
9190 return !Args[0]->isDefaultArgument();
9197 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
9198 CXXConstructorDecl *Constructor,
9199 MultiExprArg ExprArgs,
9200 bool HadMultipleCandidates,
9201 bool RequiresZeroInit,
9202 unsigned ConstructKind,
9203 SourceRange ParenRange) {
9204 bool Elidable = false;
9206 // C++0x [class.copy]p34:
9207 // When certain criteria are met, an implementation is allowed to
9208 // omit the copy/move construction of a class object, even if the
9209 // copy/move constructor and/or destructor for the object have
9210 // side effects. [...]
9211 // - when a temporary class object that has not been bound to a
9212 // reference (12.2) would be copied/moved to a class object
9213 // with the same cv-unqualified type, the copy/move operation
9214 // can be omitted by constructing the temporary object
9215 // directly into the target of the omitted copy/move
9216 if (ConstructKind == CXXConstructExpr::CK_Complete &&
9217 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) {
9218 Expr *SubExpr = ExprArgs[0];
9219 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent());
9222 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor,
9223 Elidable, ExprArgs, HadMultipleCandidates,
9224 RequiresZeroInit, ConstructKind, ParenRange);
9227 /// BuildCXXConstructExpr - Creates a complete call to a constructor,
9228 /// including handling of its default argument expressions.
9230 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
9231 CXXConstructorDecl *Constructor, bool Elidable,
9232 MultiExprArg ExprArgs,
9233 bool HadMultipleCandidates,
9234 bool RequiresZeroInit,
9235 unsigned ConstructKind,
9236 SourceRange ParenRange) {
9237 MarkFunctionReferenced(ConstructLoc, Constructor);
9238 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc,
9239 Constructor, Elidable, ExprArgs,
9240 HadMultipleCandidates, /*FIXME*/false,
9242 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind),
9246 bool Sema::InitializeVarWithConstructor(VarDecl *VD,
9247 CXXConstructorDecl *Constructor,
9249 bool HadMultipleCandidates) {
9250 // FIXME: Provide the correct paren SourceRange when available.
9251 ExprResult TempResult =
9252 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor,
9253 Exprs, HadMultipleCandidates, false,
9254 CXXConstructExpr::CK_Complete, SourceRange());
9255 if (TempResult.isInvalid())
9258 Expr *Temp = TempResult.takeAs<Expr>();
9259 CheckImplicitConversions(Temp, VD->getLocation());
9260 MarkFunctionReferenced(VD->getLocation(), Constructor);
9261 Temp = MaybeCreateExprWithCleanups(Temp);
9267 void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) {
9268 if (VD->isInvalidDecl()) return;
9270 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl());
9271 if (ClassDecl->isInvalidDecl()) return;
9272 if (ClassDecl->hasIrrelevantDestructor()) return;
9273 if (ClassDecl->isDependentContext()) return;
9275 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl);
9276 MarkFunctionReferenced(VD->getLocation(), Destructor);
9277 CheckDestructorAccess(VD->getLocation(), Destructor,
9278 PDiag(diag::err_access_dtor_var)
9279 << VD->getDeclName()
9281 DiagnoseUseOfDecl(Destructor, VD->getLocation());
9283 if (!VD->hasGlobalStorage()) return;
9285 // Emit warning for non-trivial dtor in global scope (a real global,
9286 // class-static, function-static).
9287 Diag(VD->getLocation(), diag::warn_exit_time_destructor);
9289 // TODO: this should be re-enabled for static locals by !CXAAtExit
9290 if (!VD->isStaticLocal())
9291 Diag(VD->getLocation(), diag::warn_global_destructor);
9294 /// \brief Given a constructor and the set of arguments provided for the
9295 /// constructor, convert the arguments and add any required default arguments
9296 /// to form a proper call to this constructor.
9298 /// \returns true if an error occurred, false otherwise.
9300 Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor,
9301 MultiExprArg ArgsPtr,
9303 SmallVectorImpl<Expr*> &ConvertedArgs,
9304 bool AllowExplicit) {
9305 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall.
9306 unsigned NumArgs = ArgsPtr.size();
9307 Expr **Args = ArgsPtr.data();
9309 const FunctionProtoType *Proto
9310 = Constructor->getType()->getAs<FunctionProtoType>();
9311 assert(Proto && "Constructor without a prototype?");
9312 unsigned NumArgsInProto = Proto->getNumArgs();
9314 // If too few arguments are available, we'll fill in the rest with defaults.
9315 if (NumArgs < NumArgsInProto)
9316 ConvertedArgs.reserve(NumArgsInProto);
9318 ConvertedArgs.reserve(NumArgs);
9320 VariadicCallType CallType =
9321 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;
9322 SmallVector<Expr *, 8> AllArgs;
9323 bool Invalid = GatherArgumentsForCall(Loc, Constructor,
9324 Proto, 0, Args, NumArgs, AllArgs,
9325 CallType, AllowExplicit);
9326 ConvertedArgs.append(AllArgs.begin(), AllArgs.end());
9328 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size());
9330 CheckConstructorCall(Constructor, AllArgs.data(), AllArgs.size(),
9337 CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef,
9338 const FunctionDecl *FnDecl) {
9339 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext();
9340 if (isa<NamespaceDecl>(DC)) {
9341 return SemaRef.Diag(FnDecl->getLocation(),
9342 diag::err_operator_new_delete_declared_in_namespace)
9343 << FnDecl->getDeclName();
9346 if (isa<TranslationUnitDecl>(DC) &&
9347 FnDecl->getStorageClass() == SC_Static) {
9348 return SemaRef.Diag(FnDecl->getLocation(),
9349 diag::err_operator_new_delete_declared_static)
9350 << FnDecl->getDeclName();
9357 CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl,
9358 CanQualType ExpectedResultType,
9359 CanQualType ExpectedFirstParamType,
9360 unsigned DependentParamTypeDiag,
9361 unsigned InvalidParamTypeDiag) {
9362 QualType ResultType =
9363 FnDecl->getType()->getAs<FunctionType>()->getResultType();
9365 // Check that the result type is not dependent.
9366 if (ResultType->isDependentType())
9367 return SemaRef.Diag(FnDecl->getLocation(),
9368 diag::err_operator_new_delete_dependent_result_type)
9369 << FnDecl->getDeclName() << ExpectedResultType;
9371 // Check that the result type is what we expect.
9372 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType)
9373 return SemaRef.Diag(FnDecl->getLocation(),
9374 diag::err_operator_new_delete_invalid_result_type)
9375 << FnDecl->getDeclName() << ExpectedResultType;
9377 // A function template must have at least 2 parameters.
9378 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2)
9379 return SemaRef.Diag(FnDecl->getLocation(),
9380 diag::err_operator_new_delete_template_too_few_parameters)
9381 << FnDecl->getDeclName();
9383 // The function decl must have at least 1 parameter.
9384 if (FnDecl->getNumParams() == 0)
9385 return SemaRef.Diag(FnDecl->getLocation(),
9386 diag::err_operator_new_delete_too_few_parameters)
9387 << FnDecl->getDeclName();
9389 // Check the first parameter type is not dependent.
9390 QualType FirstParamType = FnDecl->getParamDecl(0)->getType();
9391 if (FirstParamType->isDependentType())
9392 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag)
9393 << FnDecl->getDeclName() << ExpectedFirstParamType;
9395 // Check that the first parameter type is what we expect.
9396 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() !=
9397 ExpectedFirstParamType)
9398 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag)
9399 << FnDecl->getDeclName() << ExpectedFirstParamType;
9405 CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
9406 // C++ [basic.stc.dynamic.allocation]p1:
9407 // A program is ill-formed if an allocation function is declared in a
9408 // namespace scope other than global scope or declared static in global
9410 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
9413 CanQualType SizeTy =
9414 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType());
9416 // C++ [basic.stc.dynamic.allocation]p1:
9417 // The return type shall be void*. The first parameter shall have type
9419 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy,
9421 diag::err_operator_new_dependent_param_type,
9422 diag::err_operator_new_param_type))
9425 // C++ [basic.stc.dynamic.allocation]p1:
9426 // The first parameter shall not have an associated default argument.
9427 if (FnDecl->getParamDecl(0)->hasDefaultArg())
9428 return SemaRef.Diag(FnDecl->getLocation(),
9429 diag::err_operator_new_default_arg)
9430 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange();
9436 CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) {
9437 // C++ [basic.stc.dynamic.deallocation]p1:
9438 // A program is ill-formed if deallocation functions are declared in a
9439 // namespace scope other than global scope or declared static in global
9441 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
9444 // C++ [basic.stc.dynamic.deallocation]p2:
9445 // Each deallocation function shall return void and its first parameter
9447 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy,
9448 SemaRef.Context.VoidPtrTy,
9449 diag::err_operator_delete_dependent_param_type,
9450 diag::err_operator_delete_param_type))
9456 /// CheckOverloadedOperatorDeclaration - Check whether the declaration
9457 /// of this overloaded operator is well-formed. If so, returns false;
9458 /// otherwise, emits appropriate diagnostics and returns true.
9459 bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
9460 assert(FnDecl && FnDecl->isOverloadedOperator() &&
9461 "Expected an overloaded operator declaration");
9463 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator();
9465 // C++ [over.oper]p5:
9466 // The allocation and deallocation functions, operator new,
9467 // operator new[], operator delete and operator delete[], are
9468 // described completely in 3.7.3. The attributes and restrictions
9469 // found in the rest of this subclause do not apply to them unless
9470 // explicitly stated in 3.7.3.
9471 if (Op == OO_Delete || Op == OO_Array_Delete)
9472 return CheckOperatorDeleteDeclaration(*this, FnDecl);
9474 if (Op == OO_New || Op == OO_Array_New)
9475 return CheckOperatorNewDeclaration(*this, FnDecl);
9477 // C++ [over.oper]p6:
9478 // An operator function shall either be a non-static member
9479 // function or be a non-member function and have at least one
9480 // parameter whose type is a class, a reference to a class, an
9481 // enumeration, or a reference to an enumeration.
9482 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) {
9483 if (MethodDecl->isStatic())
9484 return Diag(FnDecl->getLocation(),
9485 diag::err_operator_overload_static) << FnDecl->getDeclName();
9487 bool ClassOrEnumParam = false;
9488 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(),
9489 ParamEnd = FnDecl->param_end();
9490 Param != ParamEnd; ++Param) {
9491 QualType ParamType = (*Param)->getType().getNonReferenceType();
9492 if (ParamType->isDependentType() || ParamType->isRecordType() ||
9493 ParamType->isEnumeralType()) {
9494 ClassOrEnumParam = true;
9499 if (!ClassOrEnumParam)
9500 return Diag(FnDecl->getLocation(),
9501 diag::err_operator_overload_needs_class_or_enum)
9502 << FnDecl->getDeclName();
9505 // C++ [over.oper]p8:
9506 // An operator function cannot have default arguments (8.3.6),
9507 // except where explicitly stated below.
9509 // Only the function-call operator allows default arguments
9510 // (C++ [over.call]p1).
9511 if (Op != OO_Call) {
9512 for (FunctionDecl::param_iterator Param = FnDecl->param_begin();
9513 Param != FnDecl->param_end(); ++Param) {
9514 if ((*Param)->hasDefaultArg())
9515 return Diag((*Param)->getLocation(),
9516 diag::err_operator_overload_default_arg)
9517 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange();
9521 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = {
9522 { false, false, false }
9523 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
9524 , { Unary, Binary, MemberOnly }
9525 #include "clang/Basic/OperatorKinds.def"
9528 bool CanBeUnaryOperator = OperatorUses[Op][0];
9529 bool CanBeBinaryOperator = OperatorUses[Op][1];
9530 bool MustBeMemberOperator = OperatorUses[Op][2];
9532 // C++ [over.oper]p8:
9533 // [...] Operator functions cannot have more or fewer parameters
9534 // than the number required for the corresponding operator, as
9535 // described in the rest of this subclause.
9536 unsigned NumParams = FnDecl->getNumParams()
9537 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0);
9538 if (Op != OO_Call &&
9539 ((NumParams == 1 && !CanBeUnaryOperator) ||
9540 (NumParams == 2 && !CanBeBinaryOperator) ||
9541 (NumParams < 1) || (NumParams > 2))) {
9542 // We have the wrong number of parameters.
9544 if (CanBeUnaryOperator && CanBeBinaryOperator) {
9545 ErrorKind = 2; // 2 -> unary or binary.
9546 } else if (CanBeUnaryOperator) {
9547 ErrorKind = 0; // 0 -> unary
9549 assert(CanBeBinaryOperator &&
9550 "All non-call overloaded operators are unary or binary!");
9551 ErrorKind = 1; // 1 -> binary
9554 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be)
9555 << FnDecl->getDeclName() << NumParams << ErrorKind;
9558 // Overloaded operators other than operator() cannot be variadic.
9559 if (Op != OO_Call &&
9560 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) {
9561 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic)
9562 << FnDecl->getDeclName();
9565 // Some operators must be non-static member functions.
9566 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) {
9567 return Diag(FnDecl->getLocation(),
9568 diag::err_operator_overload_must_be_member)
9569 << FnDecl->getDeclName();
9572 // C++ [over.inc]p1:
9573 // The user-defined function called operator++ implements the
9574 // prefix and postfix ++ operator. If this function is a member
9575 // function with no parameters, or a non-member function with one
9576 // parameter of class or enumeration type, it defines the prefix
9577 // increment operator ++ for objects of that type. If the function
9578 // is a member function with one parameter (which shall be of type
9579 // int) or a non-member function with two parameters (the second
9580 // of which shall be of type int), it defines the postfix
9581 // increment operator ++ for objects of that type.
9582 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) {
9583 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1);
9584 bool ParamIsInt = false;
9585 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>())
9586 ParamIsInt = BT->getKind() == BuiltinType::Int;
9589 return Diag(LastParam->getLocation(),
9590 diag::err_operator_overload_post_incdec_must_be_int)
9591 << LastParam->getType() << (Op == OO_MinusMinus);
9597 /// CheckLiteralOperatorDeclaration - Check whether the declaration
9598 /// of this literal operator function is well-formed. If so, returns
9599 /// false; otherwise, emits appropriate diagnostics and returns true.
9600 bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) {
9601 if (isa<CXXMethodDecl>(FnDecl)) {
9602 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace)
9603 << FnDecl->getDeclName();
9607 if (FnDecl->isExternC()) {
9608 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c);
9614 // This might be the definition of a literal operator template.
9615 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate();
9616 // This might be a specialization of a literal operator template.
9618 TpDecl = FnDecl->getPrimaryTemplate();
9620 // template <char...> type operator "" name() is the only valid template
9621 // signature, and the only valid signature with no parameters.
9623 if (FnDecl->param_size() == 0) {
9624 // Must have only one template parameter
9625 TemplateParameterList *Params = TpDecl->getTemplateParameters();
9626 if (Params->size() == 1) {
9627 NonTypeTemplateParmDecl *PmDecl =
9628 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0));
9630 // The template parameter must be a char parameter pack.
9631 if (PmDecl && PmDecl->isTemplateParameterPack() &&
9632 Context.hasSameType(PmDecl->getType(), Context.CharTy))
9636 } else if (FnDecl->param_size()) {
9637 // Check the first parameter
9638 FunctionDecl::param_iterator Param = FnDecl->param_begin();
9640 QualType T = (*Param)->getType().getUnqualifiedType();
9642 // unsigned long long int, long double, and any character type are allowed
9643 // as the only parameters.
9644 if (Context.hasSameType(T, Context.UnsignedLongLongTy) ||
9645 Context.hasSameType(T, Context.LongDoubleTy) ||
9646 Context.hasSameType(T, Context.CharTy) ||
9647 Context.hasSameType(T, Context.WCharTy) ||
9648 Context.hasSameType(T, Context.Char16Ty) ||
9649 Context.hasSameType(T, Context.Char32Ty)) {
9650 if (++Param == FnDecl->param_end())
9652 goto FinishedParams;
9655 // Otherwise it must be a pointer to const; let's strip those qualifiers.
9656 const PointerType *PT = T->getAs<PointerType>();
9658 goto FinishedParams;
9659 T = PT->getPointeeType();
9660 if (!T.isConstQualified() || T.isVolatileQualified())
9661 goto FinishedParams;
9662 T = T.getUnqualifiedType();
9664 // Move on to the second parameter;
9667 // If there is no second parameter, the first must be a const char *
9668 if (Param == FnDecl->param_end()) {
9669 if (Context.hasSameType(T, Context.CharTy))
9671 goto FinishedParams;
9674 // const char *, const wchar_t*, const char16_t*, and const char32_t*
9675 // are allowed as the first parameter to a two-parameter function
9676 if (!(Context.hasSameType(T, Context.CharTy) ||
9677 Context.hasSameType(T, Context.WCharTy) ||
9678 Context.hasSameType(T, Context.Char16Ty) ||
9679 Context.hasSameType(T, Context.Char32Ty)))
9680 goto FinishedParams;
9682 // The second and final parameter must be an std::size_t
9683 T = (*Param)->getType().getUnqualifiedType();
9684 if (Context.hasSameType(T, Context.getSizeType()) &&
9685 ++Param == FnDecl->param_end())
9689 // FIXME: This diagnostic is absolutely terrible.
9692 Diag(FnDecl->getLocation(), diag::err_literal_operator_params)
9693 << FnDecl->getDeclName();
9697 // A parameter-declaration-clause containing a default argument is not
9698 // equivalent to any of the permitted forms.
9699 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(),
9700 ParamEnd = FnDecl->param_end();
9701 Param != ParamEnd; ++Param) {
9702 if ((*Param)->hasDefaultArg()) {
9703 Diag((*Param)->getDefaultArgRange().getBegin(),
9704 diag::err_literal_operator_default_argument)
9705 << (*Param)->getDefaultArgRange();
9710 StringRef LiteralName
9711 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName();
9712 if (LiteralName[0] != '_') {
9713 // C++11 [usrlit.suffix]p1:
9714 // Literal suffix identifiers that do not start with an underscore
9715 // are reserved for future standardization.
9716 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved);
9722 /// ActOnStartLinkageSpecification - Parsed the beginning of a C++
9723 /// linkage specification, including the language and (if present)
9724 /// the '{'. ExternLoc is the location of the 'extern', LangLoc is
9725 /// the location of the language string literal, which is provided
9726 /// by Lang/StrSize. LBraceLoc, if valid, provides the location of
9727 /// the '{' brace. Otherwise, this linkage specification does not
9728 /// have any braces.
9729 Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc,
9730 SourceLocation LangLoc,
9732 SourceLocation LBraceLoc) {
9733 LinkageSpecDecl::LanguageIDs Language;
9734 if (Lang == "\"C\"")
9735 Language = LinkageSpecDecl::lang_c;
9736 else if (Lang == "\"C++\"")
9737 Language = LinkageSpecDecl::lang_cxx;
9739 Diag(LangLoc, diag::err_bad_language);
9743 // FIXME: Add all the various semantics of linkage specifications
9745 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext,
9746 ExternLoc, LangLoc, Language);
9747 CurContext->addDecl(D);
9748 PushDeclContext(S, D);
9752 /// ActOnFinishLinkageSpecification - Complete the definition of
9753 /// the C++ linkage specification LinkageSpec. If RBraceLoc is
9754 /// valid, it's the position of the closing '}' brace in a linkage
9755 /// specification that uses braces.
9756 Decl *Sema::ActOnFinishLinkageSpecification(Scope *S,
9758 SourceLocation RBraceLoc) {
9760 if (RBraceLoc.isValid()) {
9761 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec);
9762 LSDecl->setRBraceLoc(RBraceLoc);
9769 /// \brief Perform semantic analysis for the variable declaration that
9770 /// occurs within a C++ catch clause, returning the newly-created
9772 VarDecl *Sema::BuildExceptionDeclaration(Scope *S,
9773 TypeSourceInfo *TInfo,
9774 SourceLocation StartLoc,
9776 IdentifierInfo *Name) {
9777 bool Invalid = false;
9778 QualType ExDeclType = TInfo->getType();
9780 // Arrays and functions decay.
9781 if (ExDeclType->isArrayType())
9782 ExDeclType = Context.getArrayDecayedType(ExDeclType);
9783 else if (ExDeclType->isFunctionType())
9784 ExDeclType = Context.getPointerType(ExDeclType);
9786 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type.
9787 // The exception-declaration shall not denote a pointer or reference to an
9788 // incomplete type, other than [cv] void*.
9789 // N2844 forbids rvalue references.
9790 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) {
9791 Diag(Loc, diag::err_catch_rvalue_ref);
9795 QualType BaseType = ExDeclType;
9796 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference
9797 unsigned DK = diag::err_catch_incomplete;
9798 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
9799 BaseType = Ptr->getPointeeType();
9801 DK = diag::err_catch_incomplete_ptr;
9802 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) {
9803 // For the purpose of error recovery, we treat rvalue refs like lvalue refs.
9804 BaseType = Ref->getPointeeType();
9806 DK = diag::err_catch_incomplete_ref;
9808 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) &&
9809 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK))
9812 if (!Invalid && !ExDeclType->isDependentType() &&
9813 RequireNonAbstractType(Loc, ExDeclType,
9814 diag::err_abstract_type_in_decl,
9815 AbstractVariableType))
9818 // Only the non-fragile NeXT runtime currently supports C++ catches
9819 // of ObjC types, and no runtime supports catching ObjC types by value.
9820 if (!Invalid && getLangOpts().ObjC1) {
9821 QualType T = ExDeclType;
9822 if (const ReferenceType *RT = T->getAs<ReferenceType>())
9823 T = RT->getPointeeType();
9825 if (T->isObjCObjectType()) {
9826 Diag(Loc, diag::err_objc_object_catch);
9828 } else if (T->isObjCObjectPointerType()) {
9829 // FIXME: should this be a test for macosx-fragile specifically?
9830 if (getLangOpts().ObjCRuntime.isFragile())
9831 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile);
9835 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name,
9836 ExDeclType, TInfo, SC_None, SC_None);
9837 ExDecl->setExceptionVariable(true);
9839 // In ARC, infer 'retaining' for variables of retainable type.
9840 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl))
9843 if (!Invalid && !ExDeclType->isDependentType()) {
9844 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) {
9845 // C++ [except.handle]p16:
9846 // The object declared in an exception-declaration or, if the
9847 // exception-declaration does not specify a name, a temporary (12.2) is
9848 // copy-initialized (8.5) from the exception object. [...]
9849 // The object is destroyed when the handler exits, after the destruction
9850 // of any automatic objects initialized within the handler.
9852 // We just pretend to initialize the object with itself, then make sure
9853 // it can be destroyed later.
9854 QualType initType = ExDeclType;
9856 InitializedEntity entity =
9857 InitializedEntity::InitializeVariable(ExDecl);
9858 InitializationKind initKind =
9859 InitializationKind::CreateCopy(Loc, SourceLocation());
9862 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary);
9863 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1);
9864 ExprResult result = sequence.Perform(*this, entity, initKind,
9865 MultiExprArg(&opaqueValue, 1));
9866 if (result.isInvalid())
9869 // If the constructor used was non-trivial, set this as the
9871 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take());
9872 if (!construct->getConstructor()->isTrivial()) {
9873 Expr *init = MaybeCreateExprWithCleanups(construct);
9874 ExDecl->setInit(init);
9877 // And make sure it's destructable.
9878 FinalizeVarWithDestructor(ExDecl, recordType);
9884 ExDecl->setInvalidDecl();
9889 /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
9891 Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
9892 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
9893 bool Invalid = D.isInvalidType();
9895 // Check for unexpanded parameter packs.
9896 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
9897 UPPC_ExceptionType)) {
9898 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
9899 D.getIdentifierLoc());
9903 IdentifierInfo *II = D.getIdentifier();
9904 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(),
9906 ForRedeclaration)) {
9907 // The scope should be freshly made just for us. There is just no way
9908 // it contains any previous declaration.
9909 assert(!S->isDeclScope(PrevDecl));
9910 if (PrevDecl->isTemplateParameter()) {
9911 // Maybe we will complain about the shadowed template parameter.
9912 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
9917 if (D.getCXXScopeSpec().isSet() && !Invalid) {
9918 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator)
9919 << D.getCXXScopeSpec().getRange();
9923 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo,
9925 D.getIdentifierLoc(),
9928 ExDecl->setInvalidDecl();
9930 // Add the exception declaration into this scope.
9932 PushOnScopeChains(ExDecl, S);
9934 CurContext->addDecl(ExDecl);
9936 ProcessDeclAttributes(S, ExDecl, D);
9940 Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc,
9942 Expr *AssertMessageExpr,
9943 SourceLocation RParenLoc) {
9944 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr);
9946 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression))
9949 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr,
9950 AssertMessage, RParenLoc, false);
9953 Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc,
9955 StringLiteral *AssertMessage,
9956 SourceLocation RParenLoc,
9958 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() &&
9960 // In a static_assert-declaration, the constant-expression shall be a
9961 // constant expression that can be contextually converted to bool.
9962 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr);
9963 if (Converted.isInvalid())
9967 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond,
9968 diag::err_static_assert_expression_is_not_constant,
9969 /*AllowFold=*/false).isInvalid())
9972 if (!Failed && !Cond) {
9973 llvm::SmallString<256> MsgBuffer;
9974 llvm::raw_svector_ostream Msg(MsgBuffer);
9975 AssertMessage->printPretty(Msg, 0, getPrintingPolicy());
9976 Diag(StaticAssertLoc, diag::err_static_assert_failed)
9977 << Msg.str() << AssertExpr->getSourceRange();
9982 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc,
9983 AssertExpr, AssertMessage, RParenLoc,
9986 CurContext->addDecl(Decl);
9990 /// \brief Perform semantic analysis of the given friend type declaration.
9992 /// \returns A friend declaration that.
9993 FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart,
9994 SourceLocation FriendLoc,
9995 TypeSourceInfo *TSInfo) {
9996 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration");
9998 QualType T = TSInfo->getType();
9999 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange();
10001 // C++03 [class.friend]p2:
10002 // An elaborated-type-specifier shall be used in a friend declaration
10005 // * The class-key of the elaborated-type-specifier is required.
10006 if (!ActiveTemplateInstantiations.empty()) {
10007 // Do not complain about the form of friend template types during
10008 // template instantiation; we will already have complained when the
10009 // template was declared.
10010 } else if (!T->isElaboratedTypeSpecifier()) {
10011 // If we evaluated the type to a record type, suggest putting
10013 if (const RecordType *RT = T->getAs<RecordType>()) {
10014 RecordDecl *RD = RT->getDecl();
10016 std::string InsertionText = std::string(" ") + RD->getKindName();
10018 Diag(TypeRange.getBegin(),
10019 getLangOpts().CPlusPlus0x ?
10020 diag::warn_cxx98_compat_unelaborated_friend_type :
10021 diag::ext_unelaborated_friend_type)
10022 << (unsigned) RD->getTagKind()
10024 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc),
10028 getLangOpts().CPlusPlus0x ?
10029 diag::warn_cxx98_compat_nonclass_type_friend :
10030 diag::ext_nonclass_type_friend)
10034 } else if (T->getAs<EnumType>()) {
10036 getLangOpts().CPlusPlus0x ?
10037 diag::warn_cxx98_compat_enum_friend :
10038 diag::ext_enum_friend)
10043 // C++11 [class.friend]p3:
10044 // A friend declaration that does not declare a function shall have one
10045 // of the following forms:
10046 // friend elaborated-type-specifier ;
10047 // friend simple-type-specifier ;
10048 // friend typename-specifier ;
10049 if (getLangOpts().CPlusPlus0x && LocStart != FriendLoc)
10050 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T;
10052 // If the type specifier in a friend declaration designates a (possibly
10053 // cv-qualified) class type, that class is declared as a friend; otherwise,
10054 // the friend declaration is ignored.
10055 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc);
10058 /// Handle a friend tag declaration where the scope specifier was
10060 Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc,
10061 unsigned TagSpec, SourceLocation TagLoc,
10063 IdentifierInfo *Name, SourceLocation NameLoc,
10064 AttributeList *Attr,
10065 MultiTemplateParamsArg TempParamLists) {
10066 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
10068 bool isExplicitSpecialization = false;
10069 bool Invalid = false;
10071 if (TemplateParameterList *TemplateParams
10072 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS,
10073 TempParamLists.data(),
10074 TempParamLists.size(),
10076 isExplicitSpecialization,
10078 if (TemplateParams->size() > 0) {
10079 // This is a declaration of a class template.
10083 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc,
10084 SS, Name, NameLoc, Attr,
10085 TemplateParams, AS_public,
10086 /*ModulePrivateLoc=*/SourceLocation(),
10087 TempParamLists.size() - 1,
10088 TempParamLists.data()).take();
10090 // The "template<>" header is extraneous.
10091 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
10092 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
10093 isExplicitSpecialization = true;
10097 if (Invalid) return 0;
10099 bool isAllExplicitSpecializations = true;
10100 for (unsigned I = TempParamLists.size(); I-- > 0; ) {
10101 if (TempParamLists[I]->size()) {
10102 isAllExplicitSpecializations = false;
10107 // FIXME: don't ignore attributes.
10109 // If it's explicit specializations all the way down, just forget
10110 // about the template header and build an appropriate non-templated
10111 // friend. TODO: for source fidelity, remember the headers.
10112 if (isAllExplicitSpecializations) {
10113 if (SS.isEmpty()) {
10114 bool Owned = false;
10115 bool IsDependent = false;
10116 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc,
10118 /*ModulePrivateLoc=*/SourceLocation(),
10119 MultiTemplateParamsArg(), Owned, IsDependent,
10120 /*ScopedEnumKWLoc=*/SourceLocation(),
10121 /*ScopedEnumUsesClassTag=*/false,
10122 /*UnderlyingType=*/TypeResult());
10125 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
10126 ElaboratedTypeKeyword Keyword
10127 = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
10128 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc,
10133 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
10134 if (isa<DependentNameType>(T)) {
10135 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc());
10136 TL.setElaboratedKeywordLoc(TagLoc);
10137 TL.setQualifierLoc(QualifierLoc);
10138 TL.setNameLoc(NameLoc);
10140 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc());
10141 TL.setElaboratedKeywordLoc(TagLoc);
10142 TL.setQualifierLoc(QualifierLoc);
10143 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc);
10146 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
10148 Friend->setAccess(AS_public);
10149 CurContext->addDecl(Friend);
10153 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?");
10157 // Handle the case of a templated-scope friend class. e.g.
10158 // template <class T> class A<T>::B;
10159 // FIXME: we don't support these right now.
10160 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
10161 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name);
10162 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
10163 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc());
10164 TL.setElaboratedKeywordLoc(TagLoc);
10165 TL.setQualifierLoc(SS.getWithLocInContext(Context));
10166 TL.setNameLoc(NameLoc);
10168 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
10170 Friend->setAccess(AS_public);
10171 Friend->setUnsupportedFriend(true);
10172 CurContext->addDecl(Friend);
10177 /// Handle a friend type declaration. This works in tandem with
10180 /// Notes on friend class templates:
10182 /// We generally treat friend class declarations as if they were
10183 /// declaring a class. So, for example, the elaborated type specifier
10184 /// in a friend declaration is required to obey the restrictions of a
10185 /// class-head (i.e. no typedefs in the scope chain), template
10186 /// parameters are required to match up with simple template-ids, &c.
10187 /// However, unlike when declaring a template specialization, it's
10188 /// okay to refer to a template specialization without an empty
10189 /// template parameter declaration, e.g.
10190 /// friend class A<T>::B<unsigned>;
10191 /// We permit this as a special case; if there are any template
10192 /// parameters present at all, require proper matching, i.e.
10193 /// template <> template \<class T> friend class A<int>::B;
10194 Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
10195 MultiTemplateParamsArg TempParams) {
10196 SourceLocation Loc = DS.getLocStart();
10198 assert(DS.isFriendSpecified());
10199 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
10201 // Try to convert the decl specifier to a type. This works for
10202 // friend templates because ActOnTag never produces a ClassTemplateDecl
10203 // for a TUK_Friend.
10204 Declarator TheDeclarator(DS, Declarator::MemberContext);
10205 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S);
10206 QualType T = TSI->getType();
10207 if (TheDeclarator.isInvalidType())
10210 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration))
10213 // This is definitely an error in C++98. It's probably meant to
10214 // be forbidden in C++0x, too, but the specification is just
10217 // The problem is with declarations like the following:
10218 // template <T> friend A<T>::foo;
10219 // where deciding whether a class C is a friend or not now hinges
10220 // on whether there exists an instantiation of A that causes
10221 // 'foo' to equal C. There are restrictions on class-heads
10222 // (which we declare (by fiat) elaborated friend declarations to
10223 // be) that makes this tractable.
10225 // FIXME: handle "template <> friend class A<T>;", which
10226 // is possibly well-formed? Who even knows?
10227 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) {
10228 Diag(Loc, diag::err_tagless_friend_type_template)
10229 << DS.getSourceRange();
10233 // C++98 [class.friend]p1: A friend of a class is a function
10234 // or class that is not a member of the class . . .
10235 // This is fixed in DR77, which just barely didn't make the C++03
10236 // deadline. It's also a very silly restriction that seriously
10237 // affects inner classes and which nobody else seems to implement;
10238 // thus we never diagnose it, not even in -pedantic.
10240 // But note that we could warn about it: it's always useless to
10241 // friend one of your own members (it's not, however, worthless to
10242 // friend a member of an arbitrary specialization of your template).
10245 if (unsigned NumTempParamLists = TempParams.size())
10246 D = FriendTemplateDecl::Create(Context, CurContext, Loc,
10250 DS.getFriendSpecLoc());
10252 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI);
10257 D->setAccess(AS_public);
10258 CurContext->addDecl(D);
10263 Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D,
10264 MultiTemplateParamsArg TemplateParams) {
10265 const DeclSpec &DS = D.getDeclSpec();
10267 assert(DS.isFriendSpecified());
10268 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
10270 SourceLocation Loc = D.getIdentifierLoc();
10271 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
10273 // C++ [class.friend]p1
10274 // A friend of a class is a function or class....
10275 // Note that this sees through typedefs, which is intended.
10276 // It *doesn't* see through dependent types, which is correct
10277 // according to [temp.arg.type]p3:
10278 // If a declaration acquires a function type through a
10279 // type dependent on a template-parameter and this causes
10280 // a declaration that does not use the syntactic form of a
10281 // function declarator to have a function type, the program
10283 if (!TInfo->getType()->isFunctionType()) {
10284 Diag(Loc, diag::err_unexpected_friend);
10286 // It might be worthwhile to try to recover by creating an
10287 // appropriate declaration.
10291 // C++ [namespace.memdef]p3
10292 // - If a friend declaration in a non-local class first declares a
10293 // class or function, the friend class or function is a member
10294 // of the innermost enclosing namespace.
10295 // - The name of the friend is not found by simple name lookup
10296 // until a matching declaration is provided in that namespace
10297 // scope (either before or after the class declaration granting
10299 // - If a friend function is called, its name may be found by the
10300 // name lookup that considers functions from namespaces and
10301 // classes associated with the types of the function arguments.
10302 // - When looking for a prior declaration of a class or a function
10303 // declared as a friend, scopes outside the innermost enclosing
10304 // namespace scope are not considered.
10306 CXXScopeSpec &SS = D.getCXXScopeSpec();
10307 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
10308 DeclarationName Name = NameInfo.getName();
10311 // Check for unexpanded parameter packs.
10312 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) ||
10313 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) ||
10314 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration))
10317 // The context we found the declaration in, or in which we should
10318 // create the declaration.
10320 Scope *DCScope = S;
10321 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
10324 // FIXME: there are different rules in local classes
10326 // There are four cases here.
10327 // - There's no scope specifier, in which case we just go to the
10328 // appropriate scope and look for a function or function template
10329 // there as appropriate.
10330 // Recover from invalid scope qualifiers as if they just weren't there.
10331 if (SS.isInvalid() || !SS.isSet()) {
10332 // C++0x [namespace.memdef]p3:
10333 // If the name in a friend declaration is neither qualified nor
10334 // a template-id and the declaration is a function or an
10335 // elaborated-type-specifier, the lookup to determine whether
10336 // the entity has been previously declared shall not consider
10337 // any scopes outside the innermost enclosing namespace.
10338 // C++0x [class.friend]p11:
10339 // If a friend declaration appears in a local class and the name
10340 // specified is an unqualified name, a prior declaration is
10341 // looked up without considering scopes that are outside the
10342 // innermost enclosing non-class scope. For a friend function
10343 // declaration, if there is no prior declaration, the program is
10345 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass();
10346 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId;
10348 // Find the appropriate context according to the above.
10351 // Skip class contexts. If someone can cite chapter and verse
10352 // for this behavior, that would be nice --- it's what GCC and
10353 // EDG do, and it seems like a reasonable intent, but the spec
10354 // really only says that checks for unqualified existing
10355 // declarations should stop at the nearest enclosing namespace,
10356 // not that they should only consider the nearest enclosing
10358 while (DC->isRecord() || DC->isTransparentContext())
10359 DC = DC->getParent();
10361 LookupQualifiedName(Previous, DC);
10363 // TODO: decide what we think about using declarations.
10364 if (isLocal || !Previous.empty())
10367 if (isTemplateId) {
10368 if (isa<TranslationUnitDecl>(DC)) break;
10370 if (DC->isFileContext()) break;
10372 DC = DC->getParent();
10375 // C++ [class.friend]p1: A friend of a class is a function or
10376 // class that is not a member of the class . . .
10377 // C++11 changes this for both friend types and functions.
10378 // Most C++ 98 compilers do seem to give an error here, so
10380 if (!Previous.empty() && DC->Equals(CurContext))
10381 Diag(DS.getFriendSpecLoc(),
10382 getLangOpts().CPlusPlus0x ?
10383 diag::warn_cxx98_compat_friend_is_member :
10384 diag::err_friend_is_member);
10386 DCScope = getScopeForDeclContext(S, DC);
10388 // C++ [class.friend]p6:
10389 // A function can be defined in a friend declaration of a class if and
10390 // only if the class is a non-local class (9.8), the function name is
10391 // unqualified, and the function has namespace scope.
10392 if (isLocal && D.isFunctionDefinition()) {
10393 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class);
10396 // - There's a non-dependent scope specifier, in which case we
10397 // compute it and do a previous lookup there for a function
10398 // or function template.
10399 } else if (!SS.getScopeRep()->isDependent()) {
10400 DC = computeDeclContext(SS);
10403 if (RequireCompleteDeclContext(SS, DC)) return 0;
10405 LookupQualifiedName(Previous, DC);
10407 // Ignore things found implicitly in the wrong scope.
10408 // TODO: better diagnostics for this case. Suggesting the right
10409 // qualified scope would be nice...
10410 LookupResult::Filter F = Previous.makeFilter();
10411 while (F.hasNext()) {
10412 NamedDecl *D = F.next();
10413 if (!DC->InEnclosingNamespaceSetOf(
10414 D->getDeclContext()->getRedeclContext()))
10419 if (Previous.empty()) {
10420 D.setInvalidType();
10421 Diag(Loc, diag::err_qualified_friend_not_found)
10422 << Name << TInfo->getType();
10426 // C++ [class.friend]p1: A friend of a class is a function or
10427 // class that is not a member of the class . . .
10428 if (DC->Equals(CurContext))
10429 Diag(DS.getFriendSpecLoc(),
10430 getLangOpts().CPlusPlus0x ?
10431 diag::warn_cxx98_compat_friend_is_member :
10432 diag::err_friend_is_member);
10434 if (D.isFunctionDefinition()) {
10435 // C++ [class.friend]p6:
10436 // A function can be defined in a friend declaration of a class if and
10437 // only if the class is a non-local class (9.8), the function name is
10438 // unqualified, and the function has namespace scope.
10439 SemaDiagnosticBuilder DB
10440 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def);
10442 DB << SS.getScopeRep();
10443 if (DC->isFileContext())
10444 DB << FixItHint::CreateRemoval(SS.getRange());
10448 // - There's a scope specifier that does not match any template
10449 // parameter lists, in which case we use some arbitrary context,
10450 // create a method or method template, and wait for instantiation.
10451 // - There's a scope specifier that does match some template
10452 // parameter lists, which we don't handle right now.
10454 if (D.isFunctionDefinition()) {
10455 // C++ [class.friend]p6:
10456 // A function can be defined in a friend declaration of a class if and
10457 // only if the class is a non-local class (9.8), the function name is
10458 // unqualified, and the function has namespace scope.
10459 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def)
10460 << SS.getScopeRep();
10464 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?");
10467 if (!DC->isRecord()) {
10468 // This implies that it has to be an operator or function.
10469 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ||
10470 D.getName().getKind() == UnqualifiedId::IK_DestructorName ||
10471 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) {
10472 Diag(Loc, diag::err_introducing_special_friend) <<
10473 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 :
10474 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2);
10479 // FIXME: This is an egregious hack to cope with cases where the scope stack
10480 // does not contain the declaration context, i.e., in an out-of-line
10481 // definition of a class.
10482 Scope FakeDCScope(S, Scope::DeclScope, Diags);
10484 FakeDCScope.setEntity(DC);
10485 DCScope = &FakeDCScope;
10488 bool AddToScope = true;
10489 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous,
10490 TemplateParams, AddToScope);
10493 assert(ND->getDeclContext() == DC);
10494 assert(ND->getLexicalDeclContext() == CurContext);
10496 // Add the function declaration to the appropriate lookup tables,
10497 // adjusting the redeclarations list as necessary. We don't
10498 // want to do this yet if the friending class is dependent.
10500 // Also update the scope-based lookup if the target context's
10501 // lookup context is in lexical scope.
10502 if (!CurContext->isDependentContext()) {
10503 DC = DC->getRedeclContext();
10504 DC->makeDeclVisibleInContext(ND);
10505 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
10506 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false);
10509 FriendDecl *FrD = FriendDecl::Create(Context, CurContext,
10510 D.getIdentifierLoc(), ND,
10511 DS.getFriendSpecLoc());
10512 FrD->setAccess(AS_public);
10513 CurContext->addDecl(FrD);
10515 if (ND->isInvalidDecl()) {
10516 FrD->setInvalidDecl();
10518 if (DC->isRecord()) CheckFriendAccess(ND);
10521 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND))
10522 FD = FTD->getTemplatedDecl();
10524 FD = cast<FunctionDecl>(ND);
10526 // Mark templated-scope function declarations as unsupported.
10527 if (FD->getNumTemplateParameterLists())
10528 FrD->setUnsupportedFriend(true);
10534 void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) {
10535 AdjustDeclIfTemplate(Dcl);
10537 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl);
10539 Diag(DelLoc, diag::err_deleted_non_function);
10542 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) {
10543 // Don't consider the implicit declaration we generate for explicit
10544 // specializations. FIXME: Do not generate these implicit declarations.
10545 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization
10546 || Prev->getPreviousDecl()) && !Prev->isDefined()) {
10547 Diag(DelLoc, diag::err_deleted_decl_not_first);
10548 Diag(Prev->getLocation(), diag::note_previous_declaration);
10550 // If the declaration wasn't the first, we delete the function anyway for
10553 Fn->setDeletedAsWritten();
10555 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl);
10559 // A deleted special member function is trivial if the corresponding
10560 // implicitly-declared function would have been.
10561 switch (getSpecialMember(MD)) {
10564 case CXXDefaultConstructor:
10565 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor());
10567 case CXXCopyConstructor:
10568 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor());
10570 case CXXMoveConstructor:
10571 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor());
10573 case CXXCopyAssignment:
10574 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment());
10576 case CXXMoveAssignment:
10577 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment());
10579 case CXXDestructor:
10580 MD->setTrivial(MD->getParent()->hasTrivialDestructor());
10585 void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) {
10586 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl);
10589 if (MD->getParent()->isDependentType()) {
10590 MD->setDefaulted();
10591 MD->setExplicitlyDefaulted();
10595 CXXSpecialMember Member = getSpecialMember(MD);
10596 if (Member == CXXInvalid) {
10597 Diag(DefaultLoc, diag::err_default_special_members);
10601 MD->setDefaulted();
10602 MD->setExplicitlyDefaulted();
10604 // If this definition appears within the record, do the checking when
10605 // the record is complete.
10606 const FunctionDecl *Primary = MD;
10607 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern())
10608 // Find the uninstantiated declaration that actually had the '= default'
10610 Pattern->isDefined(Primary);
10612 if (Primary == Primary->getCanonicalDecl())
10615 CheckExplicitlyDefaultedSpecialMember(MD);
10618 case CXXDefaultConstructor: {
10619 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD);
10620 if (!CD->isInvalidDecl())
10621 DefineImplicitDefaultConstructor(DefaultLoc, CD);
10625 case CXXCopyConstructor: {
10626 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD);
10627 if (!CD->isInvalidDecl())
10628 DefineImplicitCopyConstructor(DefaultLoc, CD);
10632 case CXXCopyAssignment: {
10633 if (!MD->isInvalidDecl())
10634 DefineImplicitCopyAssignment(DefaultLoc, MD);
10638 case CXXDestructor: {
10639 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD);
10640 if (!DD->isInvalidDecl())
10641 DefineImplicitDestructor(DefaultLoc, DD);
10645 case CXXMoveConstructor: {
10646 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD);
10647 if (!CD->isInvalidDecl())
10648 DefineImplicitMoveConstructor(DefaultLoc, CD);
10652 case CXXMoveAssignment: {
10653 if (!MD->isInvalidDecl())
10654 DefineImplicitMoveAssignment(DefaultLoc, MD);
10659 llvm_unreachable("Invalid special member.");
10662 Diag(DefaultLoc, diag::err_default_special_members);
10666 static void SearchForReturnInStmt(Sema &Self, Stmt *S) {
10667 for (Stmt::child_range CI = S->children(); CI; ++CI) {
10668 Stmt *SubStmt = *CI;
10671 if (isa<ReturnStmt>(SubStmt))
10672 Self.Diag(SubStmt->getLocStart(),
10673 diag::err_return_in_constructor_handler);
10674 if (!isa<Expr>(SubStmt))
10675 SearchForReturnInStmt(Self, SubStmt);
10679 void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) {
10680 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) {
10681 CXXCatchStmt *Handler = TryBlock->getHandler(I);
10682 SearchForReturnInStmt(*this, Handler);
10686 bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
10687 const CXXMethodDecl *Old) {
10688 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType();
10689 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType();
10691 if (Context.hasSameType(NewTy, OldTy) ||
10692 NewTy->isDependentType() || OldTy->isDependentType())
10695 // Check if the return types are covariant
10696 QualType NewClassTy, OldClassTy;
10698 /// Both types must be pointers or references to classes.
10699 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) {
10700 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) {
10701 NewClassTy = NewPT->getPointeeType();
10702 OldClassTy = OldPT->getPointeeType();
10704 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) {
10705 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) {
10706 if (NewRT->getTypeClass() == OldRT->getTypeClass()) {
10707 NewClassTy = NewRT->getPointeeType();
10708 OldClassTy = OldRT->getPointeeType();
10713 // The return types aren't either both pointers or references to a class type.
10714 if (NewClassTy.isNull()) {
10715 Diag(New->getLocation(),
10716 diag::err_different_return_type_for_overriding_virtual_function)
10717 << New->getDeclName() << NewTy << OldTy;
10718 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
10723 // C++ [class.virtual]p6:
10724 // If the return type of D::f differs from the return type of B::f, the
10725 // class type in the return type of D::f shall be complete at the point of
10726 // declaration of D::f or shall be the class type D.
10727 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) {
10728 if (!RT->isBeingDefined() &&
10729 RequireCompleteType(New->getLocation(), NewClassTy,
10730 diag::err_covariant_return_incomplete,
10731 New->getDeclName()))
10735 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) {
10736 // Check if the new class derives from the old class.
10737 if (!IsDerivedFrom(NewClassTy, OldClassTy)) {
10738 Diag(New->getLocation(),
10739 diag::err_covariant_return_not_derived)
10740 << New->getDeclName() << NewTy << OldTy;
10741 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
10745 // Check if we the conversion from derived to base is valid.
10746 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy,
10747 diag::err_covariant_return_inaccessible_base,
10748 diag::err_covariant_return_ambiguous_derived_to_base_conv,
10749 // FIXME: Should this point to the return type?
10750 New->getLocation(), SourceRange(), New->getDeclName(), 0)) {
10751 // FIXME: this note won't trigger for delayed access control
10752 // diagnostics, and it's impossible to get an undelayed error
10753 // here from access control during the original parse because
10754 // the ParsingDeclSpec/ParsingDeclarator are still in scope.
10755 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
10760 // The qualifiers of the return types must be the same.
10761 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) {
10762 Diag(New->getLocation(),
10763 diag::err_covariant_return_type_different_qualifications)
10764 << New->getDeclName() << NewTy << OldTy;
10765 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
10770 // The new class type must have the same or less qualifiers as the old type.
10771 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) {
10772 Diag(New->getLocation(),
10773 diag::err_covariant_return_type_class_type_more_qualified)
10774 << New->getDeclName() << NewTy << OldTy;
10775 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
10782 /// \brief Mark the given method pure.
10784 /// \param Method the method to be marked pure.
10786 /// \param InitRange the source range that covers the "0" initializer.
10787 bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) {
10788 SourceLocation EndLoc = InitRange.getEnd();
10789 if (EndLoc.isValid())
10790 Method->setRangeEnd(EndLoc);
10792 if (Method->isVirtual() || Method->getParent()->isDependentContext()) {
10797 if (!Method->isInvalidDecl())
10798 Diag(Method->getLocation(), diag::err_non_virtual_pure)
10799 << Method->getDeclName() << InitRange;
10803 /// \brief Determine whether the given declaration is a static data member.
10804 static bool isStaticDataMember(Decl *D) {
10805 VarDecl *Var = dyn_cast_or_null<VarDecl>(D);
10809 return Var->isStaticDataMember();
10811 /// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse
10812 /// an initializer for the out-of-line declaration 'Dcl'. The scope
10813 /// is a fresh scope pushed for just this purpose.
10815 /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
10816 /// static data member of class X, names should be looked up in the scope of
10818 void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) {
10819 // If there is no declaration, there was an error parsing it.
10820 if (D == 0 || D->isInvalidDecl()) return;
10822 // We should only get called for declarations with scope specifiers, like:
10824 assert(D->isOutOfLine());
10825 EnterDeclaratorContext(S, D->getDeclContext());
10827 // If we are parsing the initializer for a static data member, push a
10828 // new expression evaluation context that is associated with this static
10830 if (isStaticDataMember(D))
10831 PushExpressionEvaluationContext(PotentiallyEvaluated, D);
10834 /// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an
10835 /// initializer for the out-of-line declaration 'D'.
10836 void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) {
10837 // If there is no declaration, there was an error parsing it.
10838 if (D == 0 || D->isInvalidDecl()) return;
10840 if (isStaticDataMember(D))
10841 PopExpressionEvaluationContext();
10843 assert(D->isOutOfLine());
10844 ExitDeclaratorContext(S);
10847 /// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a
10848 /// C++ if/switch/while/for statement.
10849 /// e.g: "if (int x = f()) {...}"
10850 DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) {
10852 // The declarator shall not specify a function or an array.
10853 // The type-specifier-seq shall not contain typedef and shall not declare a
10854 // new class or enumeration.
10855 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
10856 "Parser allowed 'typedef' as storage class of condition decl.");
10858 Decl *Dcl = ActOnDeclarator(S, D);
10862 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function.
10863 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type)
10864 << D.getSourceRange();
10871 void Sema::LoadExternalVTableUses() {
10872 if (!ExternalSource)
10875 SmallVector<ExternalVTableUse, 4> VTables;
10876 ExternalSource->ReadUsedVTables(VTables);
10877 SmallVector<VTableUse, 4> NewUses;
10878 for (unsigned I = 0, N = VTables.size(); I != N; ++I) {
10879 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos
10880 = VTablesUsed.find(VTables[I].Record);
10881 // Even if a definition wasn't required before, it may be required now.
10882 if (Pos != VTablesUsed.end()) {
10883 if (!Pos->second && VTables[I].DefinitionRequired)
10884 Pos->second = true;
10888 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired;
10889 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location));
10892 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end());
10895 void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class,
10896 bool DefinitionRequired) {
10897 // Ignore any vtable uses in unevaluated operands or for classes that do
10898 // not have a vtable.
10899 if (!Class->isDynamicClass() || Class->isDependentContext() ||
10900 CurContext->isDependentContext() ||
10901 ExprEvalContexts.back().Context == Unevaluated)
10904 // Try to insert this class into the map.
10905 LoadExternalVTableUses();
10906 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl());
10907 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool>
10908 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired));
10910 // If we already had an entry, check to see if we are promoting this vtable
10911 // to required a definition. If so, we need to reappend to the VTableUses
10912 // list, since we may have already processed the first entry.
10913 if (DefinitionRequired && !Pos.first->second) {
10914 Pos.first->second = true;
10916 // Otherwise, we can early exit.
10921 // Local classes need to have their virtual members marked
10922 // immediately. For all other classes, we mark their virtual members
10923 // at the end of the translation unit.
10924 if (Class->isLocalClass())
10925 MarkVirtualMembersReferenced(Loc, Class);
10927 VTableUses.push_back(std::make_pair(Class, Loc));
10930 bool Sema::DefineUsedVTables() {
10931 LoadExternalVTableUses();
10932 if (VTableUses.empty())
10935 // Note: The VTableUses vector could grow as a result of marking
10936 // the members of a class as "used", so we check the size each
10937 // time through the loop and prefer indices (which are stable) to
10938 // iterators (which are not).
10939 bool DefinedAnything = false;
10940 for (unsigned I = 0; I != VTableUses.size(); ++I) {
10941 CXXRecordDecl *Class = VTableUses[I].first->getDefinition();
10945 SourceLocation Loc = VTableUses[I].second;
10947 bool DefineVTable = true;
10949 // If this class has a key function, but that key function is
10950 // defined in another translation unit, we don't need to emit the
10951 // vtable even though we're using it.
10952 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class);
10953 if (KeyFunction && !KeyFunction->hasBody()) {
10954 switch (KeyFunction->getTemplateSpecializationKind()) {
10955 case TSK_Undeclared:
10956 case TSK_ExplicitSpecialization:
10957 case TSK_ExplicitInstantiationDeclaration:
10958 // The key function is in another translation unit.
10959 DefineVTable = false;
10962 case TSK_ExplicitInstantiationDefinition:
10963 case TSK_ImplicitInstantiation:
10964 // We will be instantiating the key function.
10967 } else if (!KeyFunction) {
10968 // If we have a class with no key function that is the subject
10969 // of an explicit instantiation declaration, suppress the
10970 // vtable; it will live with the explicit instantiation
10972 bool IsExplicitInstantiationDeclaration
10973 = Class->getTemplateSpecializationKind()
10974 == TSK_ExplicitInstantiationDeclaration;
10975 for (TagDecl::redecl_iterator R = Class->redecls_begin(),
10976 REnd = Class->redecls_end();
10978 TemplateSpecializationKind TSK
10979 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind();
10980 if (TSK == TSK_ExplicitInstantiationDeclaration)
10981 IsExplicitInstantiationDeclaration = true;
10982 else if (TSK == TSK_ExplicitInstantiationDefinition) {
10983 IsExplicitInstantiationDeclaration = false;
10988 if (IsExplicitInstantiationDeclaration)
10989 DefineVTable = false;
10992 // The exception specifications for all virtual members may be needed even
10993 // if we are not providing an authoritative form of the vtable in this TU.
10994 // We may choose to emit it available_externally anyway.
10995 if (!DefineVTable) {
10996 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class);
11000 // Mark all of the virtual members of this class as referenced, so
11001 // that we can build a vtable. Then, tell the AST consumer that a
11002 // vtable for this class is required.
11003 DefinedAnything = true;
11004 MarkVirtualMembersReferenced(Loc, Class);
11005 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl());
11006 Consumer.HandleVTable(Class, VTablesUsed[Canonical]);
11008 // Optionally warn if we're emitting a weak vtable.
11009 if (Class->getLinkage() == ExternalLinkage &&
11010 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) {
11011 const FunctionDecl *KeyFunctionDef = 0;
11012 if (!KeyFunction ||
11013 (KeyFunction->hasBody(KeyFunctionDef) &&
11014 KeyFunctionDef->isInlined()))
11015 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() ==
11016 TSK_ExplicitInstantiationDefinition
11017 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable)
11021 VTableUses.clear();
11023 return DefinedAnything;
11026 void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc,
11027 const CXXRecordDecl *RD) {
11028 for (CXXRecordDecl::method_iterator I = RD->method_begin(),
11029 E = RD->method_end(); I != E; ++I)
11030 if ((*I)->isVirtual() && !(*I)->isPure())
11031 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>());
11034 void Sema::MarkVirtualMembersReferenced(SourceLocation Loc,
11035 const CXXRecordDecl *RD) {
11036 // Mark all functions which will appear in RD's vtable as used.
11037 CXXFinalOverriderMap FinalOverriders;
11038 RD->getFinalOverriders(FinalOverriders);
11039 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(),
11040 E = FinalOverriders.end();
11042 for (OverridingMethods::const_iterator OI = I->second.begin(),
11043 OE = I->second.end();
11045 assert(OI->second.size() > 0 && "no final overrider");
11046 CXXMethodDecl *Overrider = OI->second.front().Method;
11048 // C++ [basic.def.odr]p2:
11049 // [...] A virtual member function is used if it is not pure. [...]
11050 if (!Overrider->isPure())
11051 MarkFunctionReferenced(Loc, Overrider);
11055 // Only classes that have virtual bases need a VTT.
11056 if (RD->getNumVBases() == 0)
11059 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(),
11060 e = RD->bases_end(); i != e; ++i) {
11061 const CXXRecordDecl *Base =
11062 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl());
11063 if (Base->getNumVBases() == 0)
11065 MarkVirtualMembersReferenced(Loc, Base);
11069 /// SetIvarInitializers - This routine builds initialization ASTs for the
11070 /// Objective-C implementation whose ivars need be initialized.
11071 void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) {
11072 if (!getLangOpts().CPlusPlus)
11074 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) {
11075 SmallVector<ObjCIvarDecl*, 8> ivars;
11076 CollectIvarsToConstructOrDestruct(OID, ivars);
11079 SmallVector<CXXCtorInitializer*, 32> AllToInit;
11080 for (unsigned i = 0; i < ivars.size(); i++) {
11081 FieldDecl *Field = ivars[i];
11082 if (Field->isInvalidDecl())
11085 CXXCtorInitializer *Member;
11086 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field);
11087 InitializationKind InitKind =
11088 InitializationKind::CreateDefault(ObjCImplementation->getLocation());
11090 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0);
11091 ExprResult MemberInit =
11092 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg());
11093 MemberInit = MaybeCreateExprWithCleanups(MemberInit);
11094 // Note, MemberInit could actually come back empty if no initialization
11095 // is required (e.g., because it would call a trivial default constructor)
11096 if (!MemberInit.get() || MemberInit.isInvalid())
11100 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(),
11102 MemberInit.takeAs<Expr>(),
11104 AllToInit.push_back(Member);
11106 // Be sure that the destructor is accessible and is marked as referenced.
11107 if (const RecordType *RecordTy
11108 = Context.getBaseElementType(Field->getType())
11109 ->getAs<RecordType>()) {
11110 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl());
11111 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) {
11112 MarkFunctionReferenced(Field->getLocation(), Destructor);
11113 CheckDestructorAccess(Field->getLocation(), Destructor,
11114 PDiag(diag::err_access_dtor_ivar)
11115 << Context.getBaseElementType(Field->getType()));
11119 ObjCImplementation->setIvarInitializers(Context,
11120 AllToInit.data(), AllToInit.size());
11125 void DelegatingCycleHelper(CXXConstructorDecl* Ctor,
11126 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid,
11127 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid,
11128 llvm::SmallSet<CXXConstructorDecl*, 4> &Current,
11130 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(),
11131 CE = Current.end();
11132 if (Ctor->isInvalidDecl())
11135 CXXConstructorDecl *Target = Ctor->getTargetConstructor();
11137 // Target may not be determinable yet, for instance if this is a dependent
11138 // call in an uninstantiated template.
11140 const FunctionDecl *FNTarget = 0;
11141 (void)Target->hasBody(FNTarget);
11142 Target = const_cast<CXXConstructorDecl*>(
11143 cast_or_null<CXXConstructorDecl>(FNTarget));
11146 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(),
11147 // Avoid dereferencing a null pointer here.
11148 *TCanonical = Target ? Target->getCanonicalDecl() : 0;
11150 if (!Current.insert(Canonical))
11153 // We know that beyond here, we aren't chaining into a cycle.
11154 if (!Target || !Target->isDelegatingConstructor() ||
11155 Target->isInvalidDecl() || Valid.count(TCanonical)) {
11156 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI)
11159 // We've hit a cycle.
11160 } else if (TCanonical == Canonical || Invalid.count(TCanonical) ||
11161 Current.count(TCanonical)) {
11162 // If we haven't diagnosed this cycle yet, do so now.
11163 if (!Invalid.count(TCanonical)) {
11164 S.Diag((*Ctor->init_begin())->getSourceLocation(),
11165 diag::warn_delegating_ctor_cycle)
11168 // Don't add a note for a function delegating directly to itself.
11169 if (TCanonical != Canonical)
11170 S.Diag(Target->getLocation(), diag::note_it_delegates_to);
11172 CXXConstructorDecl *C = Target;
11173 while (C->getCanonicalDecl() != Canonical) {
11174 const FunctionDecl *FNTarget = 0;
11175 (void)C->getTargetConstructor()->hasBody(FNTarget);
11176 assert(FNTarget && "Ctor cycle through bodiless function");
11178 C = const_cast<CXXConstructorDecl*>(
11179 cast<CXXConstructorDecl>(FNTarget));
11180 S.Diag(C->getLocation(), diag::note_which_delegates_to);
11184 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI)
11185 Invalid.insert(*CI);
11188 DelegatingCycleHelper(Target, Valid, Invalid, Current, S);
11193 void Sema::CheckDelegatingCtorCycles() {
11194 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current;
11196 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(),
11197 CE = Current.end();
11199 for (DelegatingCtorDeclsType::iterator
11200 I = DelegatingCtorDecls.begin(ExternalSource),
11201 E = DelegatingCtorDecls.end();
11203 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this);
11205 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI)
11206 (*CI)->setInvalidDecl();
11210 /// \brief AST visitor that finds references to the 'this' expression.
11211 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> {
11215 explicit FindCXXThisExpr(Sema &S) : S(S) { }
11217 bool VisitCXXThisExpr(CXXThisExpr *E) {
11218 S.Diag(E->getLocation(), diag::err_this_static_member_func)
11219 << E->isImplicit();
11225 bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) {
11226 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
11230 TypeLoc TL = TSInfo->getTypeLoc();
11231 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL);
11235 // C++11 [expr.prim.general]p3:
11236 // [The expression this] shall not appear before the optional
11237 // cv-qualifier-seq and it shall not appear within the declaration of a
11238 // static member function (although its type and value category are defined
11239 // within a static member function as they are within a non-static member
11240 // function). [ Note: this is because declaration matching does not occur
11241 // until the complete declarator is known. - end note ]
11242 const FunctionProtoType *Proto = ProtoTL->getTypePtr();
11243 FindCXXThisExpr Finder(*this);
11245 // If the return type came after the cv-qualifier-seq, check it now.
11246 if (Proto->hasTrailingReturn() &&
11247 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc()))
11250 // Check the exception specification.
11251 if (checkThisInStaticMemberFunctionExceptionSpec(Method))
11254 return checkThisInStaticMemberFunctionAttributes(Method);
11257 bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) {
11258 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
11262 TypeLoc TL = TSInfo->getTypeLoc();
11263 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL);
11267 const FunctionProtoType *Proto = ProtoTL->getTypePtr();
11268 FindCXXThisExpr Finder(*this);
11270 switch (Proto->getExceptionSpecType()) {
11271 case EST_Uninstantiated:
11272 case EST_Unevaluated:
11273 case EST_BasicNoexcept:
11274 case EST_DynamicNone:
11279 case EST_ComputedNoexcept:
11280 if (!Finder.TraverseStmt(Proto->getNoexceptExpr()))
11284 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(),
11285 EEnd = Proto->exception_end();
11287 if (!Finder.TraverseType(*E))
11296 bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) {
11297 FindCXXThisExpr Finder(*this);
11299 // Check attributes.
11300 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end();
11302 // FIXME: This should be emitted by tblgen.
11304 ArrayRef<Expr *> Args;
11305 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A))
11307 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A))
11309 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A))
11310 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size());
11311 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A))
11312 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size());
11313 else if (ExclusiveLockFunctionAttr *ELF
11314 = dyn_cast<ExclusiveLockFunctionAttr>(*A))
11315 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size());
11316 else if (SharedLockFunctionAttr *SLF
11317 = dyn_cast<SharedLockFunctionAttr>(*A))
11318 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size());
11319 else if (ExclusiveTrylockFunctionAttr *ETLF
11320 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) {
11321 Arg = ETLF->getSuccessValue();
11322 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size());
11323 } else if (SharedTrylockFunctionAttr *STLF
11324 = dyn_cast<SharedTrylockFunctionAttr>(*A)) {
11325 Arg = STLF->getSuccessValue();
11326 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size());
11327 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A))
11328 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size());
11329 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A))
11330 Arg = LR->getArg();
11331 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A))
11332 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size());
11333 else if (ExclusiveLocksRequiredAttr *ELR
11334 = dyn_cast<ExclusiveLocksRequiredAttr>(*A))
11335 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size());
11336 else if (SharedLocksRequiredAttr *SLR
11337 = dyn_cast<SharedLocksRequiredAttr>(*A))
11338 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size());
11340 if (Arg && !Finder.TraverseStmt(Arg))
11343 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
11344 if (!Finder.TraverseStmt(Args[I]))
11353 Sema::checkExceptionSpecification(ExceptionSpecificationType EST,
11354 ArrayRef<ParsedType> DynamicExceptions,
11355 ArrayRef<SourceRange> DynamicExceptionRanges,
11356 Expr *NoexceptExpr,
11357 llvm::SmallVectorImpl<QualType> &Exceptions,
11358 FunctionProtoType::ExtProtoInfo &EPI) {
11359 Exceptions.clear();
11360 EPI.ExceptionSpecType = EST;
11361 if (EST == EST_Dynamic) {
11362 Exceptions.reserve(DynamicExceptions.size());
11363 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) {
11364 // FIXME: Preserve type source info.
11365 QualType ET = GetTypeFromParser(DynamicExceptions[ei]);
11367 SmallVector<UnexpandedParameterPack, 2> Unexpanded;
11368 collectUnexpandedParameterPacks(ET, Unexpanded);
11369 if (!Unexpanded.empty()) {
11370 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(),
11371 UPPC_ExceptionType,
11376 // Check that the type is valid for an exception spec, and
11378 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei]))
11379 Exceptions.push_back(ET);
11381 EPI.NumExceptions = Exceptions.size();
11382 EPI.Exceptions = Exceptions.data();
11386 if (EST == EST_ComputedNoexcept) {
11387 // If an error occurred, there's no expression here.
11388 if (NoexceptExpr) {
11389 assert((NoexceptExpr->isTypeDependent() ||
11390 NoexceptExpr->getType()->getCanonicalTypeUnqualified() ==
11392 "Parser should have made sure that the expression is boolean");
11393 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) {
11394 EPI.ExceptionSpecType = EST_BasicNoexcept;
11398 if (!NoexceptExpr->isValueDependent())
11399 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0,
11400 diag::err_noexcept_needs_constant_expression,
11401 /*AllowFold*/ false).take();
11402 EPI.NoexceptExpr = NoexceptExpr;
11408 /// IdentifyCUDATarget - Determine the CUDA compilation target for this function
11409 Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) {
11410 // Implicitly declared functions (e.g. copy constructors) are
11411 // __host__ __device__
11412 if (D->isImplicit())
11413 return CFT_HostDevice;
11415 if (D->hasAttr<CUDAGlobalAttr>())
11418 if (D->hasAttr<CUDADeviceAttr>()) {
11419 if (D->hasAttr<CUDAHostAttr>())
11420 return CFT_HostDevice;
11428 bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget,
11429 CUDAFunctionTarget CalleeTarget) {
11430 // CUDA B.1.1 "The __device__ qualifier declares a function that is...
11431 // Callable from the device only."
11432 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device)
11435 // CUDA B.1.2 "The __global__ qualifier declares a function that is...
11436 // Callable from the host only."
11437 // CUDA B.1.3 "The __host__ qualifier declares a function that is...
11438 // Callable from the host only."
11439 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) &&
11440 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global))
11443 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice)