1 //===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements semantic analysis for C++ declarations.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Sema/SemaInternal.h"
15 #include "clang/AST/ASTConsumer.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/ASTMutationListener.h"
18 #include "clang/AST/CXXInheritance.h"
19 #include "clang/AST/CharUnits.h"
20 #include "clang/AST/DeclVisitor.h"
21 #include "clang/AST/EvaluatedExprVisitor.h"
22 #include "clang/AST/ExprCXX.h"
23 #include "clang/AST/RecordLayout.h"
24 #include "clang/AST/RecursiveASTVisitor.h"
25 #include "clang/AST/StmtVisitor.h"
26 #include "clang/AST/TypeLoc.h"
27 #include "clang/AST/TypeOrdering.h"
28 #include "clang/Basic/PartialDiagnostic.h"
29 #include "clang/Basic/TargetInfo.h"
30 #include "clang/Lex/Preprocessor.h"
31 #include "clang/Sema/CXXFieldCollector.h"
32 #include "clang/Sema/DeclSpec.h"
33 #include "clang/Sema/Initialization.h"
34 #include "clang/Sema/Lookup.h"
35 #include "clang/Sema/ParsedTemplate.h"
36 #include "clang/Sema/Scope.h"
37 #include "clang/Sema/ScopeInfo.h"
38 #include "llvm/ADT/STLExtras.h"
39 #include "llvm/ADT/SmallString.h"
43 using namespace clang;
45 //===----------------------------------------------------------------------===//
46 // CheckDefaultArgumentVisitor
47 //===----------------------------------------------------------------------===//
50 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses
51 /// the default argument of a parameter to determine whether it
52 /// contains any ill-formed subexpressions. For example, this will
53 /// diagnose the use of local variables or parameters within the
54 /// default argument expression.
55 class CheckDefaultArgumentVisitor
56 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> {
61 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
62 : DefaultArg(defarg), S(s) {}
64 bool VisitExpr(Expr *Node);
65 bool VisitDeclRefExpr(DeclRefExpr *DRE);
66 bool VisitCXXThisExpr(CXXThisExpr *ThisE);
67 bool VisitLambdaExpr(LambdaExpr *Lambda);
68 bool VisitPseudoObjectExpr(PseudoObjectExpr *POE);
71 /// VisitExpr - Visit all of the children of this expression.
72 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) {
73 bool IsInvalid = false;
74 for (Stmt::child_range I = Node->children(); I; ++I)
75 IsInvalid |= Visit(*I);
79 /// VisitDeclRefExpr - Visit a reference to a declaration, to
80 /// determine whether this declaration can be used in the default
81 /// argument expression.
82 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) {
83 NamedDecl *Decl = DRE->getDecl();
84 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) {
85 // C++ [dcl.fct.default]p9
86 // Default arguments are evaluated each time the function is
87 // called. The order of evaluation of function arguments is
88 // unspecified. Consequently, parameters of a function shall not
89 // be used in default argument expressions, even if they are not
90 // evaluated. Parameters of a function declared before a default
91 // argument expression are in scope and can hide namespace and
92 // class member names.
93 return S->Diag(DRE->getLocStart(),
94 diag::err_param_default_argument_references_param)
95 << Param->getDeclName() << DefaultArg->getSourceRange();
96 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) {
97 // C++ [dcl.fct.default]p7
98 // Local variables shall not be used in default argument
100 if (VDecl->isLocalVarDecl())
101 return S->Diag(DRE->getLocStart(),
102 diag::err_param_default_argument_references_local)
103 << VDecl->getDeclName() << DefaultArg->getSourceRange();
109 /// VisitCXXThisExpr - Visit a C++ "this" expression.
110 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) {
111 // C++ [dcl.fct.default]p8:
112 // The keyword this shall not be used in a default argument of a
114 return S->Diag(ThisE->getLocStart(),
115 diag::err_param_default_argument_references_this)
116 << ThisE->getSourceRange();
119 bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr(PseudoObjectExpr *POE) {
120 bool Invalid = false;
121 for (PseudoObjectExpr::semantics_iterator
122 i = POE->semantics_begin(), e = POE->semantics_end(); i != e; ++i) {
125 // Look through bindings.
126 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) {
127 E = OVE->getSourceExpr();
128 assert(E && "pseudo-object binding without source expression?");
136 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) {
137 // C++11 [expr.lambda.prim]p13:
138 // A lambda-expression appearing in a default argument shall not
139 // implicitly or explicitly capture any entity.
140 if (Lambda->capture_begin() == Lambda->capture_end())
143 return S->Diag(Lambda->getLocStart(),
144 diag::err_lambda_capture_default_arg);
149 Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc,
150 const CXXMethodDecl *Method) {
151 // If we have an MSAny spec already, don't bother.
152 if (!Method || ComputedEST == EST_MSAny)
155 const FunctionProtoType *Proto
156 = Method->getType()->getAs<FunctionProtoType>();
157 Proto = Self->ResolveExceptionSpec(CallLoc, Proto);
161 ExceptionSpecificationType EST = Proto->getExceptionSpecType();
163 // If this function can throw any exceptions, make a note of that.
164 if (EST == EST_MSAny || EST == EST_None) {
170 // FIXME: If the call to this decl is using any of its default arguments, we
171 // need to search them for potentially-throwing calls.
173 // If this function has a basic noexcept, it doesn't affect the outcome.
174 if (EST == EST_BasicNoexcept)
177 // If we have a throw-all spec at this point, ignore the function.
178 if (ComputedEST == EST_None)
181 // If we're still at noexcept(true) and there's a nothrow() callee,
182 // change to that specification.
183 if (EST == EST_DynamicNone) {
184 if (ComputedEST == EST_BasicNoexcept)
185 ComputedEST = EST_DynamicNone;
189 // Check out noexcept specs.
190 if (EST == EST_ComputedNoexcept) {
191 FunctionProtoType::NoexceptResult NR =
192 Proto->getNoexceptSpec(Self->Context);
193 assert(NR != FunctionProtoType::NR_NoNoexcept &&
194 "Must have noexcept result for EST_ComputedNoexcept.");
195 assert(NR != FunctionProtoType::NR_Dependent &&
196 "Should not generate implicit declarations for dependent cases, "
197 "and don't know how to handle them anyway.");
199 // noexcept(false) -> no spec on the new function
200 if (NR == FunctionProtoType::NR_Throw) {
202 ComputedEST = EST_None;
204 // noexcept(true) won't change anything either.
208 assert(EST == EST_Dynamic && "EST case not considered earlier.");
209 assert(ComputedEST != EST_None &&
210 "Shouldn't collect exceptions when throw-all is guaranteed.");
211 ComputedEST = EST_Dynamic;
212 // Record the exceptions in this function's exception specification.
213 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(),
214 EEnd = Proto->exception_end();
216 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E)))
217 Exceptions.push_back(*E);
220 void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) {
221 if (!E || ComputedEST == EST_MSAny)
226 // C++0x [except.spec]p14:
227 // [An] implicit exception-specification specifies the type-id T if and
228 // only if T is allowed by the exception-specification of a function directly
229 // invoked by f's implicit definition; f shall allow all exceptions if any
230 // function it directly invokes allows all exceptions, and f shall allow no
231 // exceptions if every function it directly invokes allows no exceptions.
233 // Note in particular that if an implicit exception-specification is generated
234 // for a function containing a throw-expression, that specification can still
235 // be noexcept(true).
237 // Note also that 'directly invoked' is not defined in the standard, and there
238 // is no indication that we should only consider potentially-evaluated calls.
240 // Ultimately we should implement the intent of the standard: the exception
241 // specification should be the set of exceptions which can be thrown by the
242 // implicit definition. For now, we assume that any non-nothrow expression can
243 // throw any exception.
245 if (Self->canThrow(E))
246 ComputedEST = EST_None;
250 Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg,
251 SourceLocation EqualLoc) {
252 if (RequireCompleteType(Param->getLocation(), Param->getType(),
253 diag::err_typecheck_decl_incomplete_type)) {
254 Param->setInvalidDecl();
258 // C++ [dcl.fct.default]p5
259 // A default argument expression is implicitly converted (clause
260 // 4) to the parameter type. The default argument expression has
261 // the same semantic constraints as the initializer expression in
262 // a declaration of a variable of the parameter type, using the
263 // copy-initialization semantics (8.5).
264 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
266 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(),
268 InitializationSequence InitSeq(*this, Entity, Kind, Arg);
269 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg);
270 if (Result.isInvalid())
272 Arg = Result.takeAs<Expr>();
274 CheckCompletedExpr(Arg, EqualLoc);
275 Arg = MaybeCreateExprWithCleanups(Arg);
277 // Okay: add the default argument to the parameter
278 Param->setDefaultArg(Arg);
280 // We have already instantiated this parameter; provide each of the
281 // instantiations with the uninstantiated default argument.
282 UnparsedDefaultArgInstantiationsMap::iterator InstPos
283 = UnparsedDefaultArgInstantiations.find(Param);
284 if (InstPos != UnparsedDefaultArgInstantiations.end()) {
285 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I)
286 InstPos->second[I]->setUninstantiatedDefaultArg(Arg);
288 // We're done tracking this parameter's instantiations.
289 UnparsedDefaultArgInstantiations.erase(InstPos);
295 /// ActOnParamDefaultArgument - Check whether the default argument
296 /// provided for a function parameter is well-formed. If so, attach it
297 /// to the parameter declaration.
299 Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc,
301 if (!param || !DefaultArg)
304 ParmVarDecl *Param = cast<ParmVarDecl>(param);
305 UnparsedDefaultArgLocs.erase(Param);
307 // Default arguments are only permitted in C++
308 if (!getLangOpts().CPlusPlus) {
309 Diag(EqualLoc, diag::err_param_default_argument)
310 << DefaultArg->getSourceRange();
311 Param->setInvalidDecl();
315 // Check for unexpanded parameter packs.
316 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) {
317 Param->setInvalidDecl();
321 // Check that the default argument is well-formed
322 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this);
323 if (DefaultArgChecker.Visit(DefaultArg)) {
324 Param->setInvalidDecl();
328 SetParamDefaultArgument(Param, DefaultArg, EqualLoc);
331 /// ActOnParamUnparsedDefaultArgument - We've seen a default
332 /// argument for a function parameter, but we can't parse it yet
333 /// because we're inside a class definition. Note that this default
334 /// argument will be parsed later.
335 void Sema::ActOnParamUnparsedDefaultArgument(Decl *param,
336 SourceLocation EqualLoc,
337 SourceLocation ArgLoc) {
341 ParmVarDecl *Param = cast<ParmVarDecl>(param);
343 Param->setUnparsedDefaultArg();
345 UnparsedDefaultArgLocs[Param] = ArgLoc;
348 /// ActOnParamDefaultArgumentError - Parsing or semantic analysis of
349 /// the default argument for the parameter param failed.
350 void Sema::ActOnParamDefaultArgumentError(Decl *param) {
354 ParmVarDecl *Param = cast<ParmVarDecl>(param);
356 Param->setInvalidDecl();
358 UnparsedDefaultArgLocs.erase(Param);
361 /// CheckExtraCXXDefaultArguments - Check for any extra default
362 /// arguments in the declarator, which is not a function declaration
363 /// or definition and therefore is not permitted to have default
364 /// arguments. This routine should be invoked for every declarator
365 /// that is not a function declaration or definition.
366 void Sema::CheckExtraCXXDefaultArguments(Declarator &D) {
367 // C++ [dcl.fct.default]p3
368 // A default argument expression shall be specified only in the
369 // parameter-declaration-clause of a function declaration or in a
370 // template-parameter (14.1). It shall not be specified for a
371 // parameter pack. If it is specified in a
372 // parameter-declaration-clause, it shall not occur within a
373 // declarator or abstract-declarator of a parameter-declaration.
374 bool MightBeFunction = D.isFunctionDeclarationContext();
375 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
376 DeclaratorChunk &chunk = D.getTypeObject(i);
377 if (chunk.Kind == DeclaratorChunk::Function) {
378 if (MightBeFunction) {
379 // This is a function declaration. It can have default arguments, but
380 // keep looking in case its return type is a function type with default
382 MightBeFunction = false;
385 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) {
387 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param);
388 if (Param->hasUnparsedDefaultArg()) {
389 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens;
390 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
391 << SourceRange((*Toks)[1].getLocation(),
392 Toks->back().getLocation());
394 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0;
395 } else if (Param->getDefaultArg()) {
396 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
397 << Param->getDefaultArg()->getSourceRange();
398 Param->setDefaultArg(0);
401 } else if (chunk.Kind != DeclaratorChunk::Paren) {
402 MightBeFunction = false;
407 /// MergeCXXFunctionDecl - Merge two declarations of the same C++
408 /// function, once we already know that they have the same
409 /// type. Subroutine of MergeFunctionDecl. Returns true if there was an
410 /// error, false otherwise.
411 bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old,
413 bool Invalid = false;
415 // C++ [dcl.fct.default]p4:
416 // For non-template functions, default arguments can be added in
417 // later declarations of a function in the same
418 // scope. Declarations in different scopes have completely
419 // distinct sets of default arguments. That is, declarations in
420 // inner scopes do not acquire default arguments from
421 // declarations in outer scopes, and vice versa. In a given
422 // function declaration, all parameters subsequent to a
423 // parameter with a default argument shall have default
424 // arguments supplied in this or previous declarations. A
425 // default argument shall not be redefined by a later
426 // declaration (not even to the same value).
428 // C++ [dcl.fct.default]p6:
429 // Except for member functions of class templates, the default arguments
430 // in a member function definition that appears outside of the class
431 // definition are added to the set of default arguments provided by the
432 // member function declaration in the class definition.
433 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) {
434 ParmVarDecl *OldParam = Old->getParamDecl(p);
435 ParmVarDecl *NewParam = New->getParamDecl(p);
437 bool OldParamHasDfl = OldParam->hasDefaultArg();
438 bool NewParamHasDfl = NewParam->hasDefaultArg();
441 if (S && !isDeclInScope(ND, New->getDeclContext(), S))
442 // Ignore default parameters of old decl if they are not in
444 OldParamHasDfl = false;
446 if (OldParamHasDfl && NewParamHasDfl) {
448 unsigned DiagDefaultParamID =
449 diag::err_param_default_argument_redefinition;
451 // MSVC accepts that default parameters be redefined for member functions
452 // of template class. The new default parameter's value is ignored.
454 if (getLangOpts().MicrosoftExt) {
455 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New);
456 if (MD && MD->getParent()->getDescribedClassTemplate()) {
457 // Merge the old default argument into the new parameter.
458 NewParam->setHasInheritedDefaultArg();
459 if (OldParam->hasUninstantiatedDefaultArg())
460 NewParam->setUninstantiatedDefaultArg(
461 OldParam->getUninstantiatedDefaultArg());
463 NewParam->setDefaultArg(OldParam->getInit());
464 DiagDefaultParamID = diag::warn_param_default_argument_redefinition;
469 // FIXME: If we knew where the '=' was, we could easily provide a fix-it
470 // hint here. Alternatively, we could walk the type-source information
471 // for NewParam to find the last source location in the type... but it
472 // isn't worth the effort right now. This is the kind of test case that
473 // is hard to get right:
475 // void g(int (*fp)(int) = f);
476 // void g(int (*fp)(int) = &f);
477 Diag(NewParam->getLocation(), DiagDefaultParamID)
478 << NewParam->getDefaultArgRange();
480 // Look for the function declaration where the default argument was
481 // actually written, which may be a declaration prior to Old.
482 for (FunctionDecl *Older = Old->getPreviousDecl();
483 Older; Older = Older->getPreviousDecl()) {
484 if (!Older->getParamDecl(p)->hasDefaultArg())
487 OldParam = Older->getParamDecl(p);
490 Diag(OldParam->getLocation(), diag::note_previous_definition)
491 << OldParam->getDefaultArgRange();
492 } else if (OldParamHasDfl) {
493 // Merge the old default argument into the new parameter.
494 // It's important to use getInit() here; getDefaultArg()
495 // strips off any top-level ExprWithCleanups.
496 NewParam->setHasInheritedDefaultArg();
497 if (OldParam->hasUninstantiatedDefaultArg())
498 NewParam->setUninstantiatedDefaultArg(
499 OldParam->getUninstantiatedDefaultArg());
501 NewParam->setDefaultArg(OldParam->getInit());
502 } else if (NewParamHasDfl) {
503 if (New->getDescribedFunctionTemplate()) {
504 // Paragraph 4, quoted above, only applies to non-template functions.
505 Diag(NewParam->getLocation(),
506 diag::err_param_default_argument_template_redecl)
507 << NewParam->getDefaultArgRange();
508 Diag(Old->getLocation(), diag::note_template_prev_declaration)
510 } else if (New->getTemplateSpecializationKind()
511 != TSK_ImplicitInstantiation &&
512 New->getTemplateSpecializationKind() != TSK_Undeclared) {
513 // C++ [temp.expr.spec]p21:
514 // Default function arguments shall not be specified in a declaration
515 // or a definition for one of the following explicit specializations:
516 // - the explicit specialization of a function template;
517 // - the explicit specialization of a member function template;
518 // - the explicit specialization of a member function of a class
519 // template where the class template specialization to which the
520 // member function specialization belongs is implicitly
522 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg)
523 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization)
524 << New->getDeclName()
525 << NewParam->getDefaultArgRange();
526 } else if (New->getDeclContext()->isDependentContext()) {
527 // C++ [dcl.fct.default]p6 (DR217):
528 // Default arguments for a member function of a class template shall
529 // be specified on the initial declaration of the member function
530 // within the class template.
532 // Reading the tea leaves a bit in DR217 and its reference to DR205
533 // leads me to the conclusion that one cannot add default function
534 // arguments for an out-of-line definition of a member function of a
537 if (CXXRecordDecl *Record
538 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) {
539 if (Record->getDescribedClassTemplate())
541 else if (isa<ClassTemplatePartialSpecializationDecl>(Record))
547 Diag(NewParam->getLocation(),
548 diag::err_param_default_argument_member_template_redecl)
550 << NewParam->getDefaultArgRange();
555 // DR1344: If a default argument is added outside a class definition and that
556 // default argument makes the function a special member function, the program
557 // is ill-formed. This can only happen for constructors.
558 if (isa<CXXConstructorDecl>(New) &&
559 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) {
560 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)),
561 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old));
562 if (NewSM != OldSM) {
563 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments());
564 assert(NewParam->hasDefaultArg());
565 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special)
566 << NewParam->getDefaultArgRange() << NewSM;
567 Diag(Old->getLocation(), diag::note_previous_declaration);
571 // C++11 [dcl.constexpr]p1: If any declaration of a function or function
572 // template has a constexpr specifier then all its declarations shall
573 // contain the constexpr specifier.
574 if (New->isConstexpr() != Old->isConstexpr()) {
575 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch)
576 << New << New->isConstexpr();
577 Diag(Old->getLocation(), diag::note_previous_declaration);
581 if (CheckEquivalentExceptionSpec(Old, New))
587 /// \brief Merge the exception specifications of two variable declarations.
589 /// This is called when there's a redeclaration of a VarDecl. The function
590 /// checks if the redeclaration might have an exception specification and
591 /// validates compatibility and merges the specs if necessary.
592 void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) {
593 // Shortcut if exceptions are disabled.
594 if (!getLangOpts().CXXExceptions)
597 assert(Context.hasSameType(New->getType(), Old->getType()) &&
598 "Should only be called if types are otherwise the same.");
600 QualType NewType = New->getType();
601 QualType OldType = Old->getType();
603 // We're only interested in pointers and references to functions, as well
604 // as pointers to member functions.
605 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) {
606 NewType = R->getPointeeType();
607 OldType = OldType->getAs<ReferenceType>()->getPointeeType();
608 } else if (const PointerType *P = NewType->getAs<PointerType>()) {
609 NewType = P->getPointeeType();
610 OldType = OldType->getAs<PointerType>()->getPointeeType();
611 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) {
612 NewType = M->getPointeeType();
613 OldType = OldType->getAs<MemberPointerType>()->getPointeeType();
616 if (!NewType->isFunctionProtoType())
619 // There's lots of special cases for functions. For function pointers, system
620 // libraries are hopefully not as broken so that we don't need these
622 if (CheckEquivalentExceptionSpec(
623 OldType->getAs<FunctionProtoType>(), Old->getLocation(),
624 NewType->getAs<FunctionProtoType>(), New->getLocation())) {
625 New->setInvalidDecl();
629 /// CheckCXXDefaultArguments - Verify that the default arguments for a
630 /// function declaration are well-formed according to C++
631 /// [dcl.fct.default].
632 void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) {
633 unsigned NumParams = FD->getNumParams();
636 // Find first parameter with a default argument
637 for (p = 0; p < NumParams; ++p) {
638 ParmVarDecl *Param = FD->getParamDecl(p);
639 if (Param->hasDefaultArg())
643 // C++ [dcl.fct.default]p4:
644 // In a given function declaration, all parameters
645 // subsequent to a parameter with a default argument shall
646 // have default arguments supplied in this or previous
647 // declarations. A default argument shall not be redefined
648 // by a later declaration (not even to the same value).
649 unsigned LastMissingDefaultArg = 0;
650 for (; p < NumParams; ++p) {
651 ParmVarDecl *Param = FD->getParamDecl(p);
652 if (!Param->hasDefaultArg()) {
653 if (Param->isInvalidDecl())
654 /* We already complained about this parameter. */;
655 else if (Param->getIdentifier())
656 Diag(Param->getLocation(),
657 diag::err_param_default_argument_missing_name)
658 << Param->getIdentifier();
660 Diag(Param->getLocation(),
661 diag::err_param_default_argument_missing);
663 LastMissingDefaultArg = p;
667 if (LastMissingDefaultArg > 0) {
668 // Some default arguments were missing. Clear out all of the
669 // default arguments up to (and including) the last missing
670 // default argument, so that we leave the function parameters
671 // in a semantically valid state.
672 for (p = 0; p <= LastMissingDefaultArg; ++p) {
673 ParmVarDecl *Param = FD->getParamDecl(p);
674 if (Param->hasDefaultArg()) {
675 Param->setDefaultArg(0);
681 // CheckConstexprParameterTypes - Check whether a function's parameter types
682 // are all literal types. If so, return true. If not, produce a suitable
683 // diagnostic and return false.
684 static bool CheckConstexprParameterTypes(Sema &SemaRef,
685 const FunctionDecl *FD) {
686 unsigned ArgIndex = 0;
687 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>();
688 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(),
689 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) {
690 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex);
691 SourceLocation ParamLoc = PD->getLocation();
692 if (!(*i)->isDependentType() &&
693 SemaRef.RequireLiteralType(ParamLoc, *i,
694 diag::err_constexpr_non_literal_param,
695 ArgIndex+1, PD->getSourceRange(),
696 isa<CXXConstructorDecl>(FD)))
702 /// \brief Get diagnostic %select index for tag kind for
703 /// record diagnostic message.
704 /// WARNING: Indexes apply to particular diagnostics only!
706 /// \returns diagnostic %select index.
707 static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) {
709 case TTK_Struct: return 0;
710 case TTK_Interface: return 1;
711 case TTK_Class: return 2;
712 default: llvm_unreachable("Invalid tag kind for record diagnostic!");
716 // CheckConstexprFunctionDecl - Check whether a function declaration satisfies
717 // the requirements of a constexpr function definition or a constexpr
718 // constructor definition. If so, return true. If not, produce appropriate
719 // diagnostics and return false.
721 // This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360.
722 bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) {
723 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
724 if (MD && MD->isInstance()) {
725 // C++11 [dcl.constexpr]p4:
726 // The definition of a constexpr constructor shall satisfy the following
728 // - the class shall not have any virtual base classes;
729 const CXXRecordDecl *RD = MD->getParent();
730 if (RD->getNumVBases()) {
731 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base)
732 << isa<CXXConstructorDecl>(NewFD)
733 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases();
734 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(),
735 E = RD->vbases_end(); I != E; ++I)
736 Diag(I->getLocStart(),
737 diag::note_constexpr_virtual_base_here) << I->getSourceRange();
742 if (!isa<CXXConstructorDecl>(NewFD)) {
743 // C++11 [dcl.constexpr]p3:
744 // The definition of a constexpr function shall satisfy the following
746 // - it shall not be virtual;
747 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD);
748 if (Method && Method->isVirtual()) {
749 Diag(NewFD->getLocation(), diag::err_constexpr_virtual);
751 // If it's not obvious why this function is virtual, find an overridden
752 // function which uses the 'virtual' keyword.
753 const CXXMethodDecl *WrittenVirtual = Method;
754 while (!WrittenVirtual->isVirtualAsWritten())
755 WrittenVirtual = *WrittenVirtual->begin_overridden_methods();
756 if (WrittenVirtual != Method)
757 Diag(WrittenVirtual->getLocation(),
758 diag::note_overridden_virtual_function);
762 // - its return type shall be a literal type;
763 QualType RT = NewFD->getResultType();
764 if (!RT->isDependentType() &&
765 RequireLiteralType(NewFD->getLocation(), RT,
766 diag::err_constexpr_non_literal_return))
770 // - each of its parameter types shall be a literal type;
771 if (!CheckConstexprParameterTypes(*this, NewFD))
777 /// Check the given declaration statement is legal within a constexpr function
778 /// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3.
780 /// \return true if the body is OK (maybe only as an extension), false if we
781 /// have diagnosed a problem.
782 static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl,
783 DeclStmt *DS, SourceLocation &Cxx1yLoc) {
784 // C++11 [dcl.constexpr]p3 and p4:
785 // The definition of a constexpr function(p3) or constructor(p4) [...] shall
787 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(),
788 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) {
789 switch ((*DclIt)->getKind()) {
790 case Decl::StaticAssert:
792 case Decl::UsingShadow:
793 case Decl::UsingDirective:
794 case Decl::UnresolvedUsingTypename:
795 case Decl::UnresolvedUsingValue:
796 // - static_assert-declarations
797 // - using-declarations,
798 // - using-directives,
802 case Decl::TypeAlias: {
803 // - typedef declarations and alias-declarations that do not define
804 // classes or enumerations,
805 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt);
806 if (TN->getUnderlyingType()->isVariablyModifiedType()) {
807 // Don't allow variably-modified types in constexpr functions.
808 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc();
809 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla)
810 << TL.getSourceRange() << TL.getType()
811 << isa<CXXConstructorDecl>(Dcl);
818 case Decl::CXXRecord:
819 // C++1y allows types to be defined, not just declared.
820 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition())
821 SemaRef.Diag(DS->getLocStart(),
822 SemaRef.getLangOpts().CPlusPlus1y
823 ? diag::warn_cxx11_compat_constexpr_type_definition
824 : diag::ext_constexpr_type_definition)
825 << isa<CXXConstructorDecl>(Dcl);
828 case Decl::EnumConstant:
829 case Decl::IndirectField:
831 // These can only appear with other declarations which are banned in
832 // C++11 and permitted in C++1y, so ignore them.
836 // C++1y [dcl.constexpr]p3 allows anything except:
837 // a definition of a variable of non-literal type or of static or
838 // thread storage duration or for which no initialization is performed.
839 VarDecl *VD = cast<VarDecl>(*DclIt);
840 if (VD->isThisDeclarationADefinition()) {
841 if (VD->isStaticLocal()) {
842 SemaRef.Diag(VD->getLocation(),
843 diag::err_constexpr_local_var_static)
844 << isa<CXXConstructorDecl>(Dcl)
845 << (VD->getTLSKind() == VarDecl::TLS_Dynamic);
848 if (!VD->getType()->isDependentType() &&
849 SemaRef.RequireLiteralType(
850 VD->getLocation(), VD->getType(),
851 diag::err_constexpr_local_var_non_literal_type,
852 isa<CXXConstructorDecl>(Dcl)))
854 if (!VD->hasInit()) {
855 SemaRef.Diag(VD->getLocation(),
856 diag::err_constexpr_local_var_no_init)
857 << isa<CXXConstructorDecl>(Dcl);
861 SemaRef.Diag(VD->getLocation(),
862 SemaRef.getLangOpts().CPlusPlus1y
863 ? diag::warn_cxx11_compat_constexpr_local_var
864 : diag::ext_constexpr_local_var)
865 << isa<CXXConstructorDecl>(Dcl);
869 case Decl::NamespaceAlias:
871 // These are disallowed in C++11 and permitted in C++1y. Allow them
872 // everywhere as an extension.
873 if (!Cxx1yLoc.isValid())
874 Cxx1yLoc = DS->getLocStart();
878 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt)
879 << isa<CXXConstructorDecl>(Dcl);
887 /// Check that the given field is initialized within a constexpr constructor.
889 /// \param Dcl The constexpr constructor being checked.
890 /// \param Field The field being checked. This may be a member of an anonymous
891 /// struct or union nested within the class being checked.
892 /// \param Inits All declarations, including anonymous struct/union members and
893 /// indirect members, for which any initialization was provided.
894 /// \param Diagnosed Set to true if an error is produced.
895 static void CheckConstexprCtorInitializer(Sema &SemaRef,
896 const FunctionDecl *Dcl,
898 llvm::SmallSet<Decl*, 16> &Inits,
900 if (Field->isUnnamedBitfield())
903 if (Field->isAnonymousStructOrUnion() &&
904 Field->getType()->getAsCXXRecordDecl()->isEmpty())
907 if (!Inits.count(Field)) {
909 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init);
912 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init);
913 } else if (Field->isAnonymousStructOrUnion()) {
914 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl();
915 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end();
917 // If an anonymous union contains an anonymous struct of which any member
918 // is initialized, all members must be initialized.
919 if (!RD->isUnion() || Inits.count(*I))
920 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed);
924 /// Check the provided statement is allowed in a constexpr function
927 CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S,
928 llvm::SmallVectorImpl<SourceLocation> &ReturnStmts,
929 SourceLocation &Cxx1yLoc) {
930 // - its function-body shall be [...] a compound-statement that contains only
931 switch (S->getStmtClass()) {
932 case Stmt::NullStmtClass:
933 // - null statements,
936 case Stmt::DeclStmtClass:
937 // - static_assert-declarations
938 // - using-declarations,
939 // - using-directives,
940 // - typedef declarations and alias-declarations that do not define
941 // classes or enumerations,
942 if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc))
946 case Stmt::ReturnStmtClass:
947 // - and exactly one return statement;
948 if (isa<CXXConstructorDecl>(Dcl)) {
949 // C++1y allows return statements in constexpr constructors.
950 if (!Cxx1yLoc.isValid())
951 Cxx1yLoc = S->getLocStart();
955 ReturnStmts.push_back(S->getLocStart());
958 case Stmt::CompoundStmtClass: {
959 // C++1y allows compound-statements.
960 if (!Cxx1yLoc.isValid())
961 Cxx1yLoc = S->getLocStart();
963 CompoundStmt *CompStmt = cast<CompoundStmt>(S);
964 for (CompoundStmt::body_iterator BodyIt = CompStmt->body_begin(),
965 BodyEnd = CompStmt->body_end(); BodyIt != BodyEnd; ++BodyIt) {
966 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, *BodyIt, ReturnStmts,
973 case Stmt::AttributedStmtClass:
974 if (!Cxx1yLoc.isValid())
975 Cxx1yLoc = S->getLocStart();
978 case Stmt::IfStmtClass: {
979 // C++1y allows if-statements.
980 if (!Cxx1yLoc.isValid())
981 Cxx1yLoc = S->getLocStart();
983 IfStmt *If = cast<IfStmt>(S);
984 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts,
988 !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts,
994 case Stmt::WhileStmtClass:
995 case Stmt::DoStmtClass:
996 case Stmt::ForStmtClass:
997 case Stmt::CXXForRangeStmtClass:
998 case Stmt::ContinueStmtClass:
999 // C++1y allows all of these. We don't allow them as extensions in C++11,
1000 // because they don't make sense without variable mutation.
1001 if (!SemaRef.getLangOpts().CPlusPlus1y)
1003 if (!Cxx1yLoc.isValid())
1004 Cxx1yLoc = S->getLocStart();
1005 for (Stmt::child_range Children = S->children(); Children; ++Children)
1007 !CheckConstexprFunctionStmt(SemaRef, Dcl, *Children, ReturnStmts,
1012 case Stmt::SwitchStmtClass:
1013 case Stmt::CaseStmtClass:
1014 case Stmt::DefaultStmtClass:
1015 case Stmt::BreakStmtClass:
1016 // C++1y allows switch-statements, and since they don't need variable
1017 // mutation, we can reasonably allow them in C++11 as an extension.
1018 if (!Cxx1yLoc.isValid())
1019 Cxx1yLoc = S->getLocStart();
1020 for (Stmt::child_range Children = S->children(); Children; ++Children)
1022 !CheckConstexprFunctionStmt(SemaRef, Dcl, *Children, ReturnStmts,
1031 // C++1y allows expression-statements.
1032 if (!Cxx1yLoc.isValid())
1033 Cxx1yLoc = S->getLocStart();
1037 SemaRef.Diag(S->getLocStart(), diag::err_constexpr_body_invalid_stmt)
1038 << isa<CXXConstructorDecl>(Dcl);
1042 /// Check the body for the given constexpr function declaration only contains
1043 /// the permitted types of statement. C++11 [dcl.constexpr]p3,p4.
1045 /// \return true if the body is OK, false if we have diagnosed a problem.
1046 bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) {
1047 if (isa<CXXTryStmt>(Body)) {
1048 // C++11 [dcl.constexpr]p3:
1049 // The definition of a constexpr function shall satisfy the following
1050 // constraints: [...]
1051 // - its function-body shall be = delete, = default, or a
1052 // compound-statement
1054 // C++11 [dcl.constexpr]p4:
1055 // In the definition of a constexpr constructor, [...]
1056 // - its function-body shall not be a function-try-block;
1057 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block)
1058 << isa<CXXConstructorDecl>(Dcl);
1062 SmallVector<SourceLocation, 4> ReturnStmts;
1064 // - its function-body shall be [...] a compound-statement that contains only
1065 // [... list of cases ...]
1066 CompoundStmt *CompBody = cast<CompoundStmt>(Body);
1067 SourceLocation Cxx1yLoc;
1068 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(),
1069 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) {
1070 if (!CheckConstexprFunctionStmt(*this, Dcl, *BodyIt, ReturnStmts, Cxx1yLoc))
1074 if (Cxx1yLoc.isValid())
1076 getLangOpts().CPlusPlus1y
1077 ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt
1078 : diag::ext_constexpr_body_invalid_stmt)
1079 << isa<CXXConstructorDecl>(Dcl);
1081 if (const CXXConstructorDecl *Constructor
1082 = dyn_cast<CXXConstructorDecl>(Dcl)) {
1083 const CXXRecordDecl *RD = Constructor->getParent();
1085 // - every non-variant non-static data member and base class sub-object
1086 // shall be initialized;
1087 // - if the class is a non-empty union, or for each non-empty anonymous
1088 // union member of a non-union class, exactly one non-static data member
1089 // shall be initialized;
1090 if (RD->isUnion()) {
1091 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) {
1092 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init);
1095 } else if (!Constructor->isDependentContext() &&
1096 !Constructor->isDelegatingConstructor()) {
1097 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases");
1099 // Skip detailed checking if we have enough initializers, and we would
1100 // allow at most one initializer per member.
1101 bool AnyAnonStructUnionMembers = false;
1102 unsigned Fields = 0;
1103 for (CXXRecordDecl::field_iterator I = RD->field_begin(),
1104 E = RD->field_end(); I != E; ++I, ++Fields) {
1105 if (I->isAnonymousStructOrUnion()) {
1106 AnyAnonStructUnionMembers = true;
1110 if (AnyAnonStructUnionMembers ||
1111 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) {
1112 // Check initialization of non-static data members. Base classes are
1113 // always initialized so do not need to be checked. Dependent bases
1114 // might not have initializers in the member initializer list.
1115 llvm::SmallSet<Decl*, 16> Inits;
1116 for (CXXConstructorDecl::init_const_iterator
1117 I = Constructor->init_begin(), E = Constructor->init_end();
1119 if (FieldDecl *FD = (*I)->getMember())
1121 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember())
1122 Inits.insert(ID->chain_begin(), ID->chain_end());
1125 bool Diagnosed = false;
1126 for (CXXRecordDecl::field_iterator I = RD->field_begin(),
1127 E = RD->field_end(); I != E; ++I)
1128 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed);
1134 if (ReturnStmts.empty()) {
1135 // C++1y doesn't require constexpr functions to contain a 'return'
1136 // statement. We still do, unless the return type is void, because
1137 // otherwise if there's no return statement, the function cannot
1138 // be used in a core constant expression.
1139 bool OK = getLangOpts().CPlusPlus1y && Dcl->getResultType()->isVoidType();
1140 Diag(Dcl->getLocation(),
1141 OK ? diag::warn_cxx11_compat_constexpr_body_no_return
1142 : diag::err_constexpr_body_no_return);
1145 if (ReturnStmts.size() > 1) {
1146 Diag(ReturnStmts.back(),
1147 getLangOpts().CPlusPlus1y
1148 ? diag::warn_cxx11_compat_constexpr_body_multiple_return
1149 : diag::ext_constexpr_body_multiple_return);
1150 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I)
1151 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return);
1155 // C++11 [dcl.constexpr]p5:
1156 // if no function argument values exist such that the function invocation
1157 // substitution would produce a constant expression, the program is
1158 // ill-formed; no diagnostic required.
1159 // C++11 [dcl.constexpr]p3:
1160 // - every constructor call and implicit conversion used in initializing the
1161 // return value shall be one of those allowed in a constant expression.
1162 // C++11 [dcl.constexpr]p4:
1163 // - every constructor involved in initializing non-static data members and
1164 // base class sub-objects shall be a constexpr constructor.
1165 SmallVector<PartialDiagnosticAt, 8> Diags;
1166 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) {
1167 Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr)
1168 << isa<CXXConstructorDecl>(Dcl);
1169 for (size_t I = 0, N = Diags.size(); I != N; ++I)
1170 Diag(Diags[I].first, Diags[I].second);
1171 // Don't return false here: we allow this for compatibility in
1178 /// isCurrentClassName - Determine whether the identifier II is the
1179 /// name of the class type currently being defined. In the case of
1180 /// nested classes, this will only return true if II is the name of
1181 /// the innermost class.
1182 bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *,
1183 const CXXScopeSpec *SS) {
1184 assert(getLangOpts().CPlusPlus && "No class names in C!");
1186 CXXRecordDecl *CurDecl;
1187 if (SS && SS->isSet() && !SS->isInvalid()) {
1188 DeclContext *DC = computeDeclContext(*SS, true);
1189 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
1191 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
1193 if (CurDecl && CurDecl->getIdentifier())
1194 return &II == CurDecl->getIdentifier();
1199 /// \brief Determine whether the given class is a base class of the given
1200 /// class, including looking at dependent bases.
1201 static bool findCircularInheritance(const CXXRecordDecl *Class,
1202 const CXXRecordDecl *Current) {
1203 SmallVector<const CXXRecordDecl*, 8> Queue;
1205 Class = Class->getCanonicalDecl();
1207 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(),
1208 E = Current->bases_end();
1210 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl();
1214 Base = Base->getDefinition();
1218 if (Base->getCanonicalDecl() == Class)
1221 Queue.push_back(Base);
1227 Current = Queue.back();
1234 /// \brief Check the validity of a C++ base class specifier.
1236 /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics
1237 /// and returns NULL otherwise.
1239 Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
1240 SourceRange SpecifierRange,
1241 bool Virtual, AccessSpecifier Access,
1242 TypeSourceInfo *TInfo,
1243 SourceLocation EllipsisLoc) {
1244 QualType BaseType = TInfo->getType();
1246 // C++ [class.union]p1:
1247 // A union shall not have base classes.
1248 if (Class->isUnion()) {
1249 Diag(Class->getLocation(), diag::err_base_clause_on_union)
1254 if (EllipsisLoc.isValid() &&
1255 !TInfo->getType()->containsUnexpandedParameterPack()) {
1256 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
1257 << TInfo->getTypeLoc().getSourceRange();
1258 EllipsisLoc = SourceLocation();
1261 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc();
1263 if (BaseType->isDependentType()) {
1264 // Make sure that we don't have circular inheritance among our dependent
1265 // bases. For non-dependent bases, the check for completeness below handles
1267 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) {
1268 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() ||
1269 ((BaseDecl = BaseDecl->getDefinition()) &&
1270 findCircularInheritance(Class, BaseDecl))) {
1271 Diag(BaseLoc, diag::err_circular_inheritance)
1272 << BaseType << Context.getTypeDeclType(Class);
1274 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl())
1275 Diag(BaseDecl->getLocation(), diag::note_previous_decl)
1282 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
1283 Class->getTagKind() == TTK_Class,
1284 Access, TInfo, EllipsisLoc);
1287 // Base specifiers must be record types.
1288 if (!BaseType->isRecordType()) {
1289 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange;
1293 // C++ [class.union]p1:
1294 // A union shall not be used as a base class.
1295 if (BaseType->isUnionType()) {
1296 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange;
1300 // C++ [class.derived]p2:
1301 // The class-name in a base-specifier shall not be an incompletely
1303 if (RequireCompleteType(BaseLoc, BaseType,
1304 diag::err_incomplete_base_class, SpecifierRange)) {
1305 Class->setInvalidDecl();
1309 // If the base class is polymorphic or isn't empty, the new one is/isn't, too.
1310 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl();
1311 assert(BaseDecl && "Record type has no declaration");
1312 BaseDecl = BaseDecl->getDefinition();
1313 assert(BaseDecl && "Base type is not incomplete, but has no definition");
1314 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl);
1315 assert(CXXBaseDecl && "Base type is not a C++ type");
1318 // If a class is marked final and it appears as a base-type-specifier in
1319 // base-clause, the program is ill-formed.
1320 if (CXXBaseDecl->hasAttr<FinalAttr>()) {
1321 Diag(BaseLoc, diag::err_class_marked_final_used_as_base)
1322 << CXXBaseDecl->getDeclName();
1323 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl)
1324 << CXXBaseDecl->getDeclName();
1328 if (BaseDecl->isInvalidDecl())
1329 Class->setInvalidDecl();
1331 // Create the base specifier.
1332 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
1333 Class->getTagKind() == TTK_Class,
1334 Access, TInfo, EllipsisLoc);
1337 /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
1338 /// one entry in the base class list of a class specifier, for
1340 /// class foo : public bar, virtual private baz {
1341 /// 'public bar' and 'virtual private baz' are each base-specifiers.
1343 Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange,
1344 ParsedAttributes &Attributes,
1345 bool Virtual, AccessSpecifier Access,
1346 ParsedType basetype, SourceLocation BaseLoc,
1347 SourceLocation EllipsisLoc) {
1351 AdjustDeclIfTemplate(classdecl);
1352 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl);
1356 // We do not support any C++11 attributes on base-specifiers yet.
1357 // Diagnose any attributes we see.
1358 if (!Attributes.empty()) {
1359 for (AttributeList *Attr = Attributes.getList(); Attr;
1360 Attr = Attr->getNext()) {
1361 if (Attr->isInvalid() ||
1362 Attr->getKind() == AttributeList::IgnoredAttribute)
1364 Diag(Attr->getLoc(),
1365 Attr->getKind() == AttributeList::UnknownAttribute
1366 ? diag::warn_unknown_attribute_ignored
1367 : diag::err_base_specifier_attribute)
1372 TypeSourceInfo *TInfo = 0;
1373 GetTypeFromParser(basetype, &TInfo);
1375 if (EllipsisLoc.isInvalid() &&
1376 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo,
1380 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange,
1381 Virtual, Access, TInfo,
1385 Class->setInvalidDecl();
1390 /// \brief Performs the actual work of attaching the given base class
1391 /// specifiers to a C++ class.
1392 bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases,
1393 unsigned NumBases) {
1397 // Used to keep track of which base types we have already seen, so
1398 // that we can properly diagnose redundant direct base types. Note
1399 // that the key is always the unqualified canonical type of the base
1401 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes;
1403 // Copy non-redundant base specifiers into permanent storage.
1404 unsigned NumGoodBases = 0;
1405 bool Invalid = false;
1406 for (unsigned idx = 0; idx < NumBases; ++idx) {
1407 QualType NewBaseType
1408 = Context.getCanonicalType(Bases[idx]->getType());
1409 NewBaseType = NewBaseType.getLocalUnqualifiedType();
1411 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType];
1413 // C++ [class.mi]p3:
1414 // A class shall not be specified as a direct base class of a
1415 // derived class more than once.
1416 Diag(Bases[idx]->getLocStart(),
1417 diag::err_duplicate_base_class)
1418 << KnownBase->getType()
1419 << Bases[idx]->getSourceRange();
1421 // Delete the duplicate base class specifier; we're going to
1422 // overwrite its pointer later.
1423 Context.Deallocate(Bases[idx]);
1427 // Okay, add this new base class.
1428 KnownBase = Bases[idx];
1429 Bases[NumGoodBases++] = Bases[idx];
1430 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) {
1431 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
1432 if (Class->isInterface() &&
1433 (!RD->isInterface() ||
1434 KnownBase->getAccessSpecifier() != AS_public)) {
1435 // The Microsoft extension __interface does not permit bases that
1436 // are not themselves public interfaces.
1437 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface)
1438 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName()
1439 << RD->getSourceRange();
1442 if (RD->hasAttr<WeakAttr>())
1443 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context));
1448 // Attach the remaining base class specifiers to the derived class.
1449 Class->setBases(Bases, NumGoodBases);
1451 // Delete the remaining (good) base class specifiers, since their
1452 // data has been copied into the CXXRecordDecl.
1453 for (unsigned idx = 0; idx < NumGoodBases; ++idx)
1454 Context.Deallocate(Bases[idx]);
1459 /// ActOnBaseSpecifiers - Attach the given base specifiers to the
1460 /// class, after checking whether there are any duplicate base
1462 void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases,
1463 unsigned NumBases) {
1464 if (!ClassDecl || !Bases || !NumBases)
1467 AdjustDeclIfTemplate(ClassDecl);
1468 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl),
1469 (CXXBaseSpecifier**)(Bases), NumBases);
1472 /// \brief Determine whether the type \p Derived is a C++ class that is
1473 /// derived from the type \p Base.
1474 bool Sema::IsDerivedFrom(QualType Derived, QualType Base) {
1475 if (!getLangOpts().CPlusPlus)
1478 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl();
1482 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl();
1486 // If either the base or the derived type is invalid, don't try to
1487 // check whether one is derived from the other.
1488 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl())
1491 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this.
1492 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD);
1495 /// \brief Determine whether the type \p Derived is a C++ class that is
1496 /// derived from the type \p Base.
1497 bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) {
1498 if (!getLangOpts().CPlusPlus)
1501 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl();
1505 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl();
1509 return DerivedRD->isDerivedFrom(BaseRD, Paths);
1512 void Sema::BuildBasePathArray(const CXXBasePaths &Paths,
1513 CXXCastPath &BasePathArray) {
1514 assert(BasePathArray.empty() && "Base path array must be empty!");
1515 assert(Paths.isRecordingPaths() && "Must record paths!");
1517 const CXXBasePath &Path = Paths.front();
1519 // We first go backward and check if we have a virtual base.
1520 // FIXME: It would be better if CXXBasePath had the base specifier for
1521 // the nearest virtual base.
1523 for (unsigned I = Path.size(); I != 0; --I) {
1524 if (Path[I - 1].Base->isVirtual()) {
1530 // Now add all bases.
1531 for (unsigned I = Start, E = Path.size(); I != E; ++I)
1532 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base));
1535 /// \brief Determine whether the given base path includes a virtual
1537 bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) {
1538 for (CXXCastPath::const_iterator B = BasePath.begin(),
1539 BEnd = BasePath.end();
1541 if ((*B)->isVirtual())
1547 /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base
1548 /// conversion (where Derived and Base are class types) is
1549 /// well-formed, meaning that the conversion is unambiguous (and
1550 /// that all of the base classes are accessible). Returns true
1551 /// and emits a diagnostic if the code is ill-formed, returns false
1552 /// otherwise. Loc is the location where this routine should point to
1553 /// if there is an error, and Range is the source range to highlight
1554 /// if there is an error.
1556 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
1557 unsigned InaccessibleBaseID,
1558 unsigned AmbigiousBaseConvID,
1559 SourceLocation Loc, SourceRange Range,
1560 DeclarationName Name,
1561 CXXCastPath *BasePath) {
1562 // First, determine whether the path from Derived to Base is
1563 // ambiguous. This is slightly more expensive than checking whether
1564 // the Derived to Base conversion exists, because here we need to
1565 // explore multiple paths to determine if there is an ambiguity.
1566 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1567 /*DetectVirtual=*/false);
1568 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths);
1569 assert(DerivationOkay &&
1570 "Can only be used with a derived-to-base conversion");
1571 (void)DerivationOkay;
1573 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) {
1574 if (InaccessibleBaseID) {
1575 // Check that the base class can be accessed.
1576 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(),
1577 InaccessibleBaseID)) {
1578 case AR_inaccessible:
1587 // Build a base path if necessary.
1589 BuildBasePathArray(Paths, *BasePath);
1593 // We know that the derived-to-base conversion is ambiguous, and
1594 // we're going to produce a diagnostic. Perform the derived-to-base
1595 // search just one more time to compute all of the possible paths so
1596 // that we can print them out. This is more expensive than any of
1597 // the previous derived-to-base checks we've done, but at this point
1598 // performance isn't as much of an issue.
1600 Paths.setRecordingPaths(true);
1601 bool StillOkay = IsDerivedFrom(Derived, Base, Paths);
1602 assert(StillOkay && "Can only be used with a derived-to-base conversion");
1605 // Build up a textual representation of the ambiguous paths, e.g.,
1606 // D -> B -> A, that will be used to illustrate the ambiguous
1607 // conversions in the diagnostic. We only print one of the paths
1608 // to each base class subobject.
1609 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths);
1611 Diag(Loc, AmbigiousBaseConvID)
1612 << Derived << Base << PathDisplayStr << Range << Name;
1617 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
1618 SourceLocation Loc, SourceRange Range,
1619 CXXCastPath *BasePath,
1620 bool IgnoreAccess) {
1621 return CheckDerivedToBaseConversion(Derived, Base,
1623 : diag::err_upcast_to_inaccessible_base,
1624 diag::err_ambiguous_derived_to_base_conv,
1625 Loc, Range, DeclarationName(),
1630 /// @brief Builds a string representing ambiguous paths from a
1631 /// specific derived class to different subobjects of the same base
1634 /// This function builds a string that can be used in error messages
1635 /// to show the different paths that one can take through the
1636 /// inheritance hierarchy to go from the derived class to different
1637 /// subobjects of a base class. The result looks something like this:
1639 /// struct D -> struct B -> struct A
1640 /// struct D -> struct C -> struct A
1642 std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) {
1643 std::string PathDisplayStr;
1644 std::set<unsigned> DisplayedPaths;
1645 for (CXXBasePaths::paths_iterator Path = Paths.begin();
1646 Path != Paths.end(); ++Path) {
1647 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) {
1648 // We haven't displayed a path to this particular base
1649 // class subobject yet.
1650 PathDisplayStr += "\n ";
1651 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString();
1652 for (CXXBasePath::const_iterator Element = Path->begin();
1653 Element != Path->end(); ++Element)
1654 PathDisplayStr += " -> " + Element->Base->getType().getAsString();
1658 return PathDisplayStr;
1661 //===----------------------------------------------------------------------===//
1662 // C++ class member Handling
1663 //===----------------------------------------------------------------------===//
1665 /// ActOnAccessSpecifier - Parsed an access specifier followed by a colon.
1666 bool Sema::ActOnAccessSpecifier(AccessSpecifier Access,
1667 SourceLocation ASLoc,
1668 SourceLocation ColonLoc,
1669 AttributeList *Attrs) {
1670 assert(Access != AS_none && "Invalid kind for syntactic access specifier!");
1671 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext,
1673 CurContext->addHiddenDecl(ASDecl);
1674 return ProcessAccessDeclAttributeList(ASDecl, Attrs);
1677 /// CheckOverrideControl - Check C++11 override control semantics.
1678 void Sema::CheckOverrideControl(Decl *D) {
1679 if (D->isInvalidDecl())
1682 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D);
1684 // Do we know which functions this declaration might be overriding?
1685 bool OverridesAreKnown = !MD ||
1686 (!MD->getParent()->hasAnyDependentBases() &&
1687 !MD->getType()->isDependentType());
1689 if (!MD || !MD->isVirtual()) {
1690 if (OverridesAreKnown) {
1691 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) {
1692 Diag(OA->getLocation(),
1693 diag::override_keyword_only_allowed_on_virtual_member_functions)
1694 << "override" << FixItHint::CreateRemoval(OA->getLocation());
1695 D->dropAttr<OverrideAttr>();
1697 if (FinalAttr *FA = D->getAttr<FinalAttr>()) {
1698 Diag(FA->getLocation(),
1699 diag::override_keyword_only_allowed_on_virtual_member_functions)
1700 << "final" << FixItHint::CreateRemoval(FA->getLocation());
1701 D->dropAttr<FinalAttr>();
1707 if (!OverridesAreKnown)
1710 // C++11 [class.virtual]p5:
1711 // If a virtual function is marked with the virt-specifier override and
1712 // does not override a member function of a base class, the program is
1714 bool HasOverriddenMethods =
1715 MD->begin_overridden_methods() != MD->end_overridden_methods();
1716 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods)
1717 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding)
1718 << MD->getDeclName();
1721 /// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member
1722 /// function overrides a virtual member function marked 'final', according to
1723 /// C++11 [class.virtual]p4.
1724 bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New,
1725 const CXXMethodDecl *Old) {
1726 if (!Old->hasAttr<FinalAttr>())
1729 Diag(New->getLocation(), diag::err_final_function_overridden)
1730 << New->getDeclName();
1731 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
1735 static bool InitializationHasSideEffects(const FieldDecl &FD) {
1736 const Type *T = FD.getType()->getBaseElementTypeUnsafe();
1737 // FIXME: Destruction of ObjC lifetime types has side-effects.
1738 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
1739 return !RD->isCompleteDefinition() ||
1740 !RD->hasTrivialDefaultConstructor() ||
1741 !RD->hasTrivialDestructor();
1745 static AttributeList *getMSPropertyAttr(AttributeList *list) {
1746 for (AttributeList* it = list; it != 0; it = it->getNext())
1747 if (it->isDeclspecPropertyAttribute())
1752 /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member
1753 /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the
1754 /// bitfield width if there is one, 'InitExpr' specifies the initializer if
1755 /// one has been parsed, and 'InitStyle' is set if an in-class initializer is
1756 /// present (but parsing it has been deferred).
1758 Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
1759 MultiTemplateParamsArg TemplateParameterLists,
1760 Expr *BW, const VirtSpecifiers &VS,
1761 InClassInitStyle InitStyle) {
1762 const DeclSpec &DS = D.getDeclSpec();
1763 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
1764 DeclarationName Name = NameInfo.getName();
1765 SourceLocation Loc = NameInfo.getLoc();
1767 // For anonymous bitfields, the location should point to the type.
1768 if (Loc.isInvalid())
1769 Loc = D.getLocStart();
1771 Expr *BitWidth = static_cast<Expr*>(BW);
1773 assert(isa<CXXRecordDecl>(CurContext));
1774 assert(!DS.isFriendSpecified());
1776 bool isFunc = D.isDeclarationOfFunction();
1778 if (cast<CXXRecordDecl>(CurContext)->isInterface()) {
1779 // The Microsoft extension __interface only permits public member functions
1780 // and prohibits constructors, destructors, operators, non-public member
1781 // functions, static methods and data members.
1782 unsigned InvalidDecl;
1783 bool ShowDeclName = true;
1785 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1;
1786 else if (AS != AS_public)
1788 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static)
1790 else switch (Name.getNameKind()) {
1791 case DeclarationName::CXXConstructorName:
1793 ShowDeclName = false;
1796 case DeclarationName::CXXDestructorName:
1798 ShowDeclName = false;
1801 case DeclarationName::CXXOperatorName:
1802 case DeclarationName::CXXConversionFunctionName:
1813 Diag(Loc, diag::err_invalid_member_in_interface)
1814 << (InvalidDecl-1) << Name;
1816 Diag(Loc, diag::err_invalid_member_in_interface)
1817 << (InvalidDecl-1) << "";
1822 // C++ 9.2p6: A member shall not be declared to have automatic storage
1823 // duration (auto, register) or with the extern storage-class-specifier.
1824 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class
1825 // data members and cannot be applied to names declared const or static,
1826 // and cannot be applied to reference members.
1827 switch (DS.getStorageClassSpec()) {
1828 case DeclSpec::SCS_unspecified:
1829 case DeclSpec::SCS_typedef:
1830 case DeclSpec::SCS_static:
1832 case DeclSpec::SCS_mutable:
1834 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function);
1836 // FIXME: It would be nicer if the keyword was ignored only for this
1837 // declarator. Otherwise we could get follow-up errors.
1838 D.getMutableDeclSpec().ClearStorageClassSpecs();
1842 Diag(DS.getStorageClassSpecLoc(),
1843 diag::err_storageclass_invalid_for_member);
1844 D.getMutableDeclSpec().ClearStorageClassSpecs();
1848 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
1849 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
1852 if (DS.isConstexprSpecified() && isInstField) {
1853 SemaDiagnosticBuilder B =
1854 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member);
1855 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc();
1856 if (InitStyle == ICIS_NoInit) {
1857 B << 0 << 0 << FixItHint::CreateReplacement(ConstexprLoc, "const");
1858 D.getMutableDeclSpec().ClearConstexprSpec();
1859 const char *PrevSpec;
1861 bool Failed = D.getMutableDeclSpec().SetTypeQual(DeclSpec::TQ_const, ConstexprLoc,
1862 PrevSpec, DiagID, getLangOpts());
1864 assert(!Failed && "Making a constexpr member const shouldn't fail");
1867 const char *PrevSpec;
1869 if (D.getMutableDeclSpec().SetStorageClassSpec(
1870 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID)) {
1871 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable &&
1872 "This is the only DeclSpec that should fail to be applied");
1875 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static ");
1876 isInstField = false;
1883 CXXScopeSpec &SS = D.getCXXScopeSpec();
1885 // Data members must have identifiers for names.
1886 if (!Name.isIdentifier()) {
1887 Diag(Loc, diag::err_bad_variable_name)
1892 IdentifierInfo *II = Name.getAsIdentifierInfo();
1894 // Member field could not be with "template" keyword.
1895 // So TemplateParameterLists should be empty in this case.
1896 if (TemplateParameterLists.size()) {
1897 TemplateParameterList* TemplateParams = TemplateParameterLists[0];
1898 if (TemplateParams->size()) {
1899 // There is no such thing as a member field template.
1900 Diag(D.getIdentifierLoc(), diag::err_template_member)
1902 << SourceRange(TemplateParams->getTemplateLoc(),
1903 TemplateParams->getRAngleLoc());
1905 // There is an extraneous 'template<>' for this member.
1906 Diag(TemplateParams->getTemplateLoc(),
1907 diag::err_template_member_noparams)
1909 << SourceRange(TemplateParams->getTemplateLoc(),
1910 TemplateParams->getRAngleLoc());
1915 if (SS.isSet() && !SS.isInvalid()) {
1916 // The user provided a superfluous scope specifier inside a class
1922 if (DeclContext *DC = computeDeclContext(SS, false))
1923 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc());
1925 Diag(D.getIdentifierLoc(), diag::err_member_qualification)
1926 << Name << SS.getRange();
1931 AttributeList *MSPropertyAttr =
1932 getMSPropertyAttr(D.getDeclSpec().getAttributes().getList());
1933 if (MSPropertyAttr) {
1934 Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D,
1935 BitWidth, InitStyle, AS, MSPropertyAttr);
1936 isInstField = false;
1938 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D,
1939 BitWidth, InitStyle, AS);
1941 assert(Member && "HandleField never returns null");
1943 assert(InitStyle == ICIS_NoInit || D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static);
1945 Member = HandleDeclarator(S, D, TemplateParameterLists);
1950 // Non-instance-fields can't have a bitfield.
1952 if (Member->isInvalidDecl()) {
1953 // don't emit another diagnostic.
1954 } else if (isa<VarDecl>(Member)) {
1955 // C++ 9.6p3: A bit-field shall not be a static member.
1956 // "static member 'A' cannot be a bit-field"
1957 Diag(Loc, diag::err_static_not_bitfield)
1958 << Name << BitWidth->getSourceRange();
1959 } else if (isa<TypedefDecl>(Member)) {
1960 // "typedef member 'x' cannot be a bit-field"
1961 Diag(Loc, diag::err_typedef_not_bitfield)
1962 << Name << BitWidth->getSourceRange();
1964 // A function typedef ("typedef int f(); f a;").
1965 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
1966 Diag(Loc, diag::err_not_integral_type_bitfield)
1967 << Name << cast<ValueDecl>(Member)->getType()
1968 << BitWidth->getSourceRange();
1972 Member->setInvalidDecl();
1975 Member->setAccess(AS);
1977 // If we have declared a member function template, set the access of the
1978 // templated declaration as well.
1979 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member))
1980 FunTmpl->getTemplatedDecl()->setAccess(AS);
1983 if (VS.isOverrideSpecified())
1984 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context));
1985 if (VS.isFinalSpecified())
1986 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context));
1988 if (VS.getLastLocation().isValid()) {
1989 // Update the end location of a method that has a virt-specifiers.
1990 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member))
1991 MD->setRangeEnd(VS.getLastLocation());
1994 CheckOverrideControl(Member);
1996 assert((Name || isInstField) && "No identifier for non-field ?");
1999 FieldDecl *FD = cast<FieldDecl>(Member);
2000 FieldCollector->Add(FD);
2002 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field,
2004 != DiagnosticsEngine::Ignored) {
2005 // Remember all explicit private FieldDecls that have a name, no side
2006 // effects and are not part of a dependent type declaration.
2007 if (!FD->isImplicit() && FD->getDeclName() &&
2008 FD->getAccess() == AS_private &&
2009 !FD->hasAttr<UnusedAttr>() &&
2010 !FD->getParent()->isDependentContext() &&
2011 !InitializationHasSideEffects(*FD))
2012 UnusedPrivateFields.insert(FD);
2020 class UninitializedFieldVisitor
2021 : public EvaluatedExprVisitor<UninitializedFieldVisitor> {
2025 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited;
2026 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context),
2028 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(VD))
2029 this->VD = IFD->getAnonField();
2034 void HandleExpr(Expr *E) {
2037 // Expressions like x(x) sometimes lack the surrounding expressions
2038 // but need to be checked anyways.
2043 void HandleValue(Expr *E) {
2044 E = E->IgnoreParens();
2046 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
2047 if (isa<EnumConstantDecl>(ME->getMemberDecl()))
2050 // FieldME is the inner-most MemberExpr that is not an anonymous struct
2052 MemberExpr *FieldME = ME;
2055 while (isa<MemberExpr>(Base)) {
2056 ME = cast<MemberExpr>(Base);
2058 if (isa<VarDecl>(ME->getMemberDecl()))
2061 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()))
2062 if (!FD->isAnonymousStructOrUnion())
2065 Base = ME->getBase();
2068 if (VD == FieldME->getMemberDecl() && isa<CXXThisExpr>(Base)) {
2069 unsigned diag = VD->getType()->isReferenceType()
2070 ? diag::warn_reference_field_is_uninit
2071 : diag::warn_field_is_uninit;
2072 S.Diag(FieldME->getExprLoc(), diag) << VD;
2077 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
2078 HandleValue(CO->getTrueExpr());
2079 HandleValue(CO->getFalseExpr());
2083 if (BinaryConditionalOperator *BCO =
2084 dyn_cast<BinaryConditionalOperator>(E)) {
2085 HandleValue(BCO->getCommon());
2086 HandleValue(BCO->getFalseExpr());
2090 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
2091 switch (BO->getOpcode()) {
2096 HandleValue(BO->getLHS());
2099 HandleValue(BO->getRHS());
2105 void VisitImplicitCastExpr(ImplicitCastExpr *E) {
2106 if (E->getCastKind() == CK_LValueToRValue)
2107 HandleValue(E->getSubExpr());
2109 Inherited::VisitImplicitCastExpr(E);
2112 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
2113 Expr *Callee = E->getCallee();
2114 if (isa<MemberExpr>(Callee))
2115 HandleValue(Callee);
2117 Inherited::VisitCXXMemberCallExpr(E);
2120 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E,
2122 UninitializedFieldVisitor(S, VD).HandleExpr(E);
2126 /// ActOnCXXInClassMemberInitializer - This is invoked after parsing an
2127 /// in-class initializer for a non-static C++ class member, and after
2128 /// instantiating an in-class initializer in a class template. Such actions
2129 /// are deferred until the class is complete.
2131 Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc,
2133 FieldDecl *FD = cast<FieldDecl>(D);
2134 assert(FD->getInClassInitStyle() != ICIS_NoInit &&
2135 "must set init style when field is created");
2138 FD->setInvalidDecl();
2139 FD->removeInClassInitializer();
2143 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) {
2144 FD->setInvalidDecl();
2145 FD->removeInClassInitializer();
2149 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc)
2150 != DiagnosticsEngine::Ignored) {
2151 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD);
2154 ExprResult Init = InitExpr;
2155 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) {
2156 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) {
2157 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list)
2158 << /*at end of ctor*/1 << InitExpr->getSourceRange();
2160 InitializedEntity Entity = InitializedEntity::InitializeMember(FD);
2161 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit
2162 ? InitializationKind::CreateDirectList(InitExpr->getLocStart())
2163 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc);
2164 InitializationSequence Seq(*this, Entity, Kind, InitExpr);
2165 Init = Seq.Perform(*this, Entity, Kind, InitExpr);
2166 if (Init.isInvalid()) {
2167 FD->setInvalidDecl();
2172 // C++11 [class.base.init]p7:
2173 // The initialization of each base and member constitutes a
2175 Init = ActOnFinishFullExpr(Init.take(), InitLoc);
2176 if (Init.isInvalid()) {
2177 FD->setInvalidDecl();
2181 InitExpr = Init.release();
2183 FD->setInClassInitializer(InitExpr);
2186 /// \brief Find the direct and/or virtual base specifiers that
2187 /// correspond to the given base type, for use in base initialization
2188 /// within a constructor.
2189 static bool FindBaseInitializer(Sema &SemaRef,
2190 CXXRecordDecl *ClassDecl,
2192 const CXXBaseSpecifier *&DirectBaseSpec,
2193 const CXXBaseSpecifier *&VirtualBaseSpec) {
2194 // First, check for a direct base class.
2196 for (CXXRecordDecl::base_class_const_iterator Base
2197 = ClassDecl->bases_begin();
2198 Base != ClassDecl->bases_end(); ++Base) {
2199 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) {
2200 // We found a direct base of this type. That's what we're
2202 DirectBaseSpec = &*Base;
2207 // Check for a virtual base class.
2208 // FIXME: We might be able to short-circuit this if we know in advance that
2209 // there are no virtual bases.
2210 VirtualBaseSpec = 0;
2211 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) {
2212 // We haven't found a base yet; search the class hierarchy for a
2213 // virtual base class.
2214 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
2215 /*DetectVirtual=*/false);
2216 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl),
2218 for (CXXBasePaths::paths_iterator Path = Paths.begin();
2219 Path != Paths.end(); ++Path) {
2220 if (Path->back().Base->isVirtual()) {
2221 VirtualBaseSpec = Path->back().Base;
2228 return DirectBaseSpec || VirtualBaseSpec;
2231 /// \brief Handle a C++ member initializer using braced-init-list syntax.
2233 Sema::ActOnMemInitializer(Decl *ConstructorD,
2236 IdentifierInfo *MemberOrBase,
2237 ParsedType TemplateTypeTy,
2239 SourceLocation IdLoc,
2241 SourceLocation EllipsisLoc) {
2242 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
2243 DS, IdLoc, InitList,
2247 /// \brief Handle a C++ member initializer using parentheses syntax.
2249 Sema::ActOnMemInitializer(Decl *ConstructorD,
2252 IdentifierInfo *MemberOrBase,
2253 ParsedType TemplateTypeTy,
2255 SourceLocation IdLoc,
2256 SourceLocation LParenLoc,
2257 Expr **Args, unsigned NumArgs,
2258 SourceLocation RParenLoc,
2259 SourceLocation EllipsisLoc) {
2260 Expr *List = new (Context) ParenListExpr(Context, LParenLoc,
2261 llvm::makeArrayRef(Args, NumArgs),
2263 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
2264 DS, IdLoc, List, EllipsisLoc);
2269 // Callback to only accept typo corrections that can be a valid C++ member
2270 // intializer: either a non-static field member or a base class.
2271 class MemInitializerValidatorCCC : public CorrectionCandidateCallback {
2273 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl)
2274 : ClassDecl(ClassDecl) {}
2276 virtual bool ValidateCandidate(const TypoCorrection &candidate) {
2277 if (NamedDecl *ND = candidate.getCorrectionDecl()) {
2278 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND))
2279 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl);
2281 return isa<TypeDecl>(ND);
2287 CXXRecordDecl *ClassDecl;
2292 /// \brief Handle a C++ member initializer.
2294 Sema::BuildMemInitializer(Decl *ConstructorD,
2297 IdentifierInfo *MemberOrBase,
2298 ParsedType TemplateTypeTy,
2300 SourceLocation IdLoc,
2302 SourceLocation EllipsisLoc) {
2306 AdjustDeclIfTemplate(ConstructorD);
2308 CXXConstructorDecl *Constructor
2309 = dyn_cast<CXXConstructorDecl>(ConstructorD);
2311 // The user wrote a constructor initializer on a function that is
2312 // not a C++ constructor. Ignore the error for now, because we may
2313 // have more member initializers coming; we'll diagnose it just
2314 // once in ActOnMemInitializers.
2318 CXXRecordDecl *ClassDecl = Constructor->getParent();
2320 // C++ [class.base.init]p2:
2321 // Names in a mem-initializer-id are looked up in the scope of the
2322 // constructor's class and, if not found in that scope, are looked
2323 // up in the scope containing the constructor's definition.
2324 // [Note: if the constructor's class contains a member with the
2325 // same name as a direct or virtual base class of the class, a
2326 // mem-initializer-id naming the member or base class and composed
2327 // of a single identifier refers to the class member. A
2328 // mem-initializer-id for the hidden base class may be specified
2329 // using a qualified name. ]
2330 if (!SS.getScopeRep() && !TemplateTypeTy) {
2331 // Look for a member, first.
2332 DeclContext::lookup_result Result
2333 = ClassDecl->lookup(MemberOrBase);
2334 if (!Result.empty()) {
2336 if ((Member = dyn_cast<FieldDecl>(Result.front())) ||
2337 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) {
2338 if (EllipsisLoc.isValid())
2339 Diag(EllipsisLoc, diag::err_pack_expansion_member_init)
2341 << SourceRange(IdLoc, Init->getSourceRange().getEnd());
2343 return BuildMemberInitializer(Member, Init, IdLoc);
2347 // It didn't name a member, so see if it names a class.
2349 TypeSourceInfo *TInfo = 0;
2351 if (TemplateTypeTy) {
2352 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo);
2353 } else if (DS.getTypeSpecType() == TST_decltype) {
2354 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc());
2356 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName);
2357 LookupParsedName(R, S, &SS);
2359 TypeDecl *TyD = R.getAsSingle<TypeDecl>();
2361 if (R.isAmbiguous()) return true;
2363 // We don't want access-control diagnostics here.
2364 R.suppressDiagnostics();
2366 if (SS.isSet() && isDependentScopeSpecifier(SS)) {
2367 bool NotUnknownSpecialization = false;
2368 DeclContext *DC = computeDeclContext(SS, false);
2369 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC))
2370 NotUnknownSpecialization = !Record->hasAnyDependentBases();
2372 if (!NotUnknownSpecialization) {
2373 // When the scope specifier can refer to a member of an unknown
2374 // specialization, we take it as a type name.
2375 BaseType = CheckTypenameType(ETK_None, SourceLocation(),
2376 SS.getWithLocInContext(Context),
2377 *MemberOrBase, IdLoc);
2378 if (BaseType.isNull())
2382 R.setLookupName(MemberOrBase);
2386 // If no results were found, try to correct typos.
2387 TypoCorrection Corr;
2388 MemInitializerValidatorCCC Validator(ClassDecl);
2389 if (R.empty() && BaseType.isNull() &&
2390 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS,
2391 Validator, ClassDecl))) {
2392 std::string CorrectedStr(Corr.getAsString(getLangOpts()));
2393 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts()));
2394 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) {
2395 // We have found a non-static data member with a similar
2396 // name to what was typed; complain and initialize that
2398 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest)
2399 << MemberOrBase << true << CorrectedQuotedStr
2400 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr);
2401 Diag(Member->getLocation(), diag::note_previous_decl)
2402 << CorrectedQuotedStr;
2404 return BuildMemberInitializer(Member, Init, IdLoc);
2405 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) {
2406 const CXXBaseSpecifier *DirectBaseSpec;
2407 const CXXBaseSpecifier *VirtualBaseSpec;
2408 if (FindBaseInitializer(*this, ClassDecl,
2409 Context.getTypeDeclType(Type),
2410 DirectBaseSpec, VirtualBaseSpec)) {
2411 // We have found a direct or virtual base class with a
2412 // similar name to what was typed; complain and initialize
2414 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest)
2415 << MemberOrBase << false << CorrectedQuotedStr
2416 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr);
2418 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec
2420 Diag(BaseSpec->getLocStart(),
2421 diag::note_base_class_specified_here)
2422 << BaseSpec->getType()
2423 << BaseSpec->getSourceRange();
2430 if (!TyD && BaseType.isNull()) {
2431 Diag(IdLoc, diag::err_mem_init_not_member_or_class)
2432 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd());
2437 if (BaseType.isNull()) {
2438 BaseType = Context.getTypeDeclType(TyD);
2440 NestedNameSpecifier *Qualifier =
2441 static_cast<NestedNameSpecifier*>(SS.getScopeRep());
2443 // FIXME: preserve source range information
2444 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType);
2450 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc);
2452 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc);
2455 /// Checks a member initializer expression for cases where reference (or
2456 /// pointer) members are bound to by-value parameters (or their addresses).
2457 static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member,
2459 SourceLocation IdLoc) {
2460 QualType MemberTy = Member->getType();
2462 // We only handle pointers and references currently.
2463 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers?
2464 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType())
2467 const bool IsPointer = MemberTy->isPointerType();
2469 if (const UnaryOperator *Op
2470 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) {
2471 // The only case we're worried about with pointers requires taking the
2473 if (Op->getOpcode() != UO_AddrOf)
2476 Init = Op->getSubExpr();
2478 // We only handle address-of expression initializers for pointers.
2483 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) {
2484 // Taking the address of a temporary will be diagnosed as a hard error.
2488 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary)
2489 << Member << Init->getSourceRange();
2490 } else if (const DeclRefExpr *DRE
2491 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) {
2492 // We only warn when referring to a non-reference parameter declaration.
2493 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl());
2494 if (!Parameter || Parameter->getType()->isReferenceType())
2497 S.Diag(Init->getExprLoc(),
2498 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr
2499 : diag::warn_bind_ref_member_to_parameter)
2500 << Member << Parameter << Init->getSourceRange();
2502 // Other initializers are fine.
2506 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here)
2507 << (unsigned)IsPointer;
2511 Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init,
2512 SourceLocation IdLoc) {
2513 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member);
2514 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member);
2515 assert((DirectMember || IndirectMember) &&
2516 "Member must be a FieldDecl or IndirectFieldDecl");
2518 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
2521 if (Member->isInvalidDecl())
2524 // Diagnose value-uses of fields to initialize themselves, e.g.
2526 // where foo is not also a parameter to the constructor.
2527 // TODO: implement -Wuninitialized and fold this into that framework.
2529 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
2530 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
2531 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) {
2532 Args = MultiExprArg(InitList->getInits(), InitList->getNumInits());
2534 // Template instantiation doesn't reconstruct ParenListExprs for us.
2538 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc)
2539 != DiagnosticsEngine::Ignored)
2540 for (unsigned i = 0, e = Args.size(); i != e; ++i)
2541 // FIXME: Warn about the case when other fields are used before being
2542 // initialized. For example, let this field be the i'th field. When
2543 // initializing the i'th field, throw a warning if any of the >= i'th
2544 // fields are used, as they are not yet initialized.
2545 // Right now we are only handling the case where the i'th field uses
2546 // itself in its initializer.
2547 // Also need to take into account that some fields may be initialized by
2548 // in-class initializers, see C++11 [class.base.init]p9.
2549 CheckInitExprContainsUninitializedFields(*this, Args[i], Member);
2551 SourceRange InitRange = Init->getSourceRange();
2553 if (Member->getType()->isDependentType() || Init->isTypeDependent()) {
2554 // Can't check initialization for a member of dependent type or when
2555 // any of the arguments are type-dependent expressions.
2556 DiscardCleanupsInEvaluationContext();
2558 bool InitList = false;
2559 if (isa<InitListExpr>(Init)) {
2563 if (isStdInitializerList(Member->getType(), 0)) {
2564 Diag(IdLoc, diag::warn_dangling_std_initializer_list)
2565 << /*at end of ctor*/1 << InitRange;
2569 // Initialize the member.
2570 InitializedEntity MemberEntity =
2571 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0)
2572 : InitializedEntity::InitializeMember(IndirectMember, 0);
2573 InitializationKind Kind =
2574 InitList ? InitializationKind::CreateDirectList(IdLoc)
2575 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(),
2576 InitRange.getEnd());
2578 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args);
2579 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args, 0);
2580 if (MemberInit.isInvalid())
2583 // C++11 [class.base.init]p7:
2584 // The initialization of each base and member constitutes a
2586 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin());
2587 if (MemberInit.isInvalid())
2590 Init = MemberInit.get();
2591 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc);
2595 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc,
2596 InitRange.getBegin(), Init,
2597 InitRange.getEnd());
2599 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc,
2600 InitRange.getBegin(), Init,
2601 InitRange.getEnd());
2606 Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init,
2607 CXXRecordDecl *ClassDecl) {
2608 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin();
2609 if (!LangOpts.CPlusPlus11)
2610 return Diag(NameLoc, diag::err_delegating_ctor)
2611 << TInfo->getTypeLoc().getLocalSourceRange();
2612 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor);
2614 bool InitList = true;
2615 MultiExprArg Args = Init;
2616 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
2618 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
2621 SourceRange InitRange = Init->getSourceRange();
2622 // Initialize the object.
2623 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation(
2624 QualType(ClassDecl->getTypeForDecl(), 0));
2625 InitializationKind Kind =
2626 InitList ? InitializationKind::CreateDirectList(NameLoc)
2627 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(),
2628 InitRange.getEnd());
2629 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args);
2630 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind,
2632 if (DelegationInit.isInvalid())
2635 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() &&
2636 "Delegating constructor with no target?");
2638 // C++11 [class.base.init]p7:
2639 // The initialization of each base and member constitutes a
2641 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(),
2642 InitRange.getBegin());
2643 if (DelegationInit.isInvalid())
2646 // If we are in a dependent context, template instantiation will
2647 // perform this type-checking again. Just save the arguments that we
2648 // received in a ParenListExpr.
2649 // FIXME: This isn't quite ideal, since our ASTs don't capture all
2650 // of the information that we have about the base
2651 // initializer. However, deconstructing the ASTs is a dicey process,
2652 // and this approach is far more likely to get the corner cases right.
2653 if (CurContext->isDependentContext())
2654 DelegationInit = Owned(Init);
2656 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(),
2657 DelegationInit.takeAs<Expr>(),
2658 InitRange.getEnd());
2662 Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo,
2663 Expr *Init, CXXRecordDecl *ClassDecl,
2664 SourceLocation EllipsisLoc) {
2665 SourceLocation BaseLoc
2666 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin();
2668 if (!BaseType->isDependentType() && !BaseType->isRecordType())
2669 return Diag(BaseLoc, diag::err_base_init_does_not_name_class)
2670 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
2672 // C++ [class.base.init]p2:
2673 // [...] Unless the mem-initializer-id names a nonstatic data
2674 // member of the constructor's class or a direct or virtual base
2675 // of that class, the mem-initializer is ill-formed. A
2676 // mem-initializer-list can initialize a base class using any
2677 // name that denotes that base class type.
2678 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent();
2680 SourceRange InitRange = Init->getSourceRange();
2681 if (EllipsisLoc.isValid()) {
2682 // This is a pack expansion.
2683 if (!BaseType->containsUnexpandedParameterPack()) {
2684 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
2685 << SourceRange(BaseLoc, InitRange.getEnd());
2687 EllipsisLoc = SourceLocation();
2690 // Check for any unexpanded parameter packs.
2691 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer))
2694 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
2698 // Check for direct and virtual base classes.
2699 const CXXBaseSpecifier *DirectBaseSpec = 0;
2700 const CXXBaseSpecifier *VirtualBaseSpec = 0;
2702 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0),
2704 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl);
2706 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec,
2709 // C++ [base.class.init]p2:
2710 // Unless the mem-initializer-id names a nonstatic data member of the
2711 // constructor's class or a direct or virtual base of that class, the
2712 // mem-initializer is ill-formed.
2713 if (!DirectBaseSpec && !VirtualBaseSpec) {
2714 // If the class has any dependent bases, then it's possible that
2715 // one of those types will resolve to the same type as
2716 // BaseType. Therefore, just treat this as a dependent base
2717 // class initialization. FIXME: Should we try to check the
2718 // initialization anyway? It seems odd.
2719 if (ClassDecl->hasAnyDependentBases())
2722 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual)
2723 << BaseType << Context.getTypeDeclType(ClassDecl)
2724 << BaseTInfo->getTypeLoc().getLocalSourceRange();
2729 DiscardCleanupsInEvaluationContext();
2731 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
2732 /*IsVirtual=*/false,
2733 InitRange.getBegin(), Init,
2734 InitRange.getEnd(), EllipsisLoc);
2737 // C++ [base.class.init]p2:
2738 // If a mem-initializer-id is ambiguous because it designates both
2739 // a direct non-virtual base class and an inherited virtual base
2740 // class, the mem-initializer is ill-formed.
2741 if (DirectBaseSpec && VirtualBaseSpec)
2742 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual)
2743 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
2745 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec);
2747 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec);
2749 // Initialize the base.
2750 bool InitList = true;
2751 MultiExprArg Args = Init;
2752 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
2754 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
2757 InitializedEntity BaseEntity =
2758 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec);
2759 InitializationKind Kind =
2760 InitList ? InitializationKind::CreateDirectList(BaseLoc)
2761 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(),
2762 InitRange.getEnd());
2763 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args);
2764 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, 0);
2765 if (BaseInit.isInvalid())
2768 // C++11 [class.base.init]p7:
2769 // The initialization of each base and member constitutes a
2771 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin());
2772 if (BaseInit.isInvalid())
2775 // If we are in a dependent context, template instantiation will
2776 // perform this type-checking again. Just save the arguments that we
2777 // received in a ParenListExpr.
2778 // FIXME: This isn't quite ideal, since our ASTs don't capture all
2779 // of the information that we have about the base
2780 // initializer. However, deconstructing the ASTs is a dicey process,
2781 // and this approach is far more likely to get the corner cases right.
2782 if (CurContext->isDependentContext())
2783 BaseInit = Owned(Init);
2785 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
2786 BaseSpec->isVirtual(),
2787 InitRange.getBegin(),
2788 BaseInit.takeAs<Expr>(),
2789 InitRange.getEnd(), EllipsisLoc);
2792 // Create a static_cast\<T&&>(expr).
2793 static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) {
2794 if (T.isNull()) T = E->getType();
2795 QualType TargetType = SemaRef.BuildReferenceType(
2796 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName());
2797 SourceLocation ExprLoc = E->getLocStart();
2798 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo(
2799 TargetType, ExprLoc);
2801 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E,
2802 SourceRange(ExprLoc, ExprLoc),
2803 E->getSourceRange()).take();
2806 /// ImplicitInitializerKind - How an implicit base or member initializer should
2807 /// initialize its base or member.
2808 enum ImplicitInitializerKind {
2816 BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
2817 ImplicitInitializerKind ImplicitInitKind,
2818 CXXBaseSpecifier *BaseSpec,
2819 bool IsInheritedVirtualBase,
2820 CXXCtorInitializer *&CXXBaseInit) {
2821 InitializedEntity InitEntity
2822 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec,
2823 IsInheritedVirtualBase);
2825 ExprResult BaseInit;
2827 switch (ImplicitInitKind) {
2829 const CXXRecordDecl *Inherited =
2830 Constructor->getInheritedConstructor()->getParent();
2831 const CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl();
2832 if (Base && Inherited->getCanonicalDecl() == Base->getCanonicalDecl()) {
2833 // C++11 [class.inhctor]p8:
2834 // Each expression in the expression-list is of the form
2835 // static_cast<T&&>(p), where p is the name of the corresponding
2836 // constructor parameter and T is the declared type of p.
2837 SmallVector<Expr*, 16> Args;
2838 for (unsigned I = 0, E = Constructor->getNumParams(); I != E; ++I) {
2839 ParmVarDecl *PD = Constructor->getParamDecl(I);
2840 ExprResult ArgExpr =
2841 SemaRef.BuildDeclRefExpr(PD, PD->getType().getNonReferenceType(),
2842 VK_LValue, SourceLocation());
2843 if (ArgExpr.isInvalid())
2845 Args.push_back(CastForMoving(SemaRef, ArgExpr.take(), PD->getType()));
2848 InitializationKind InitKind = InitializationKind::CreateDirect(
2849 Constructor->getLocation(), SourceLocation(), SourceLocation());
2850 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, Args);
2851 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, Args);
2857 InitializationKind InitKind
2858 = InitializationKind::CreateDefault(Constructor->getLocation());
2859 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None);
2860 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None);
2866 bool Moving = ImplicitInitKind == IIK_Move;
2867 ParmVarDecl *Param = Constructor->getParamDecl(0);
2868 QualType ParamType = Param->getType().getNonReferenceType();
2871 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
2872 SourceLocation(), Param, false,
2873 Constructor->getLocation(), ParamType,
2876 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg));
2878 // Cast to the base class to avoid ambiguities.
2880 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(),
2881 ParamType.getQualifiers());
2884 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg);
2887 CXXCastPath BasePath;
2888 BasePath.push_back(BaseSpec);
2889 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy,
2890 CK_UncheckedDerivedToBase,
2891 Moving ? VK_XValue : VK_LValue,
2894 InitializationKind InitKind
2895 = InitializationKind::CreateDirect(Constructor->getLocation(),
2896 SourceLocation(), SourceLocation());
2897 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg);
2898 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg);
2903 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit);
2904 if (BaseInit.isInvalid())
2908 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
2909 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(),
2911 BaseSpec->isVirtual(),
2913 BaseInit.takeAs<Expr>(),
2920 static bool RefersToRValueRef(Expr *MemRef) {
2921 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl();
2922 return Referenced->getType()->isRValueReferenceType();
2926 BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
2927 ImplicitInitializerKind ImplicitInitKind,
2928 FieldDecl *Field, IndirectFieldDecl *Indirect,
2929 CXXCtorInitializer *&CXXMemberInit) {
2930 if (Field->isInvalidDecl())
2933 SourceLocation Loc = Constructor->getLocation();
2935 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) {
2936 bool Moving = ImplicitInitKind == IIK_Move;
2937 ParmVarDecl *Param = Constructor->getParamDecl(0);
2938 QualType ParamType = Param->getType().getNonReferenceType();
2940 // Suppress copying zero-width bitfields.
2941 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0)
2944 Expr *MemberExprBase =
2945 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
2946 SourceLocation(), Param, false,
2947 Loc, ParamType, VK_LValue, 0);
2949 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase));
2952 MemberExprBase = CastForMoving(SemaRef, MemberExprBase);
2955 // Build a reference to this field within the parameter.
2957 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc,
2958 Sema::LookupMemberName);
2959 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect)
2960 : cast<ValueDecl>(Field), AS_public);
2961 MemberLookup.resolveKind();
2963 = SemaRef.BuildMemberReferenceExpr(MemberExprBase,
2967 /*TemplateKWLoc=*/SourceLocation(),
2968 /*FirstQualifierInScope=*/0,
2970 /*TemplateArgs=*/0);
2971 if (CtorArg.isInvalid())
2974 // C++11 [class.copy]p15:
2975 // - if a member m has rvalue reference type T&&, it is direct-initialized
2976 // with static_cast<T&&>(x.m);
2977 if (RefersToRValueRef(CtorArg.get())) {
2978 CtorArg = CastForMoving(SemaRef, CtorArg.take());
2981 // When the field we are copying is an array, create index variables for
2982 // each dimension of the array. We use these index variables to subscript
2983 // the source array, and other clients (e.g., CodeGen) will perform the
2984 // necessary iteration with these index variables.
2985 SmallVector<VarDecl *, 4> IndexVariables;
2986 QualType BaseType = Field->getType();
2987 QualType SizeType = SemaRef.Context.getSizeType();
2988 bool InitializingArray = false;
2989 while (const ConstantArrayType *Array
2990 = SemaRef.Context.getAsConstantArrayType(BaseType)) {
2991 InitializingArray = true;
2992 // Create the iteration variable for this array index.
2993 IdentifierInfo *IterationVarName = 0;
2996 llvm::raw_svector_ostream OS(Str);
2997 OS << "__i" << IndexVariables.size();
2998 IterationVarName = &SemaRef.Context.Idents.get(OS.str());
3000 VarDecl *IterationVar
3001 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc,
3002 IterationVarName, SizeType,
3003 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc),
3005 IndexVariables.push_back(IterationVar);
3007 // Create a reference to the iteration variable.
3008 ExprResult IterationVarRef
3009 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc);
3010 assert(!IterationVarRef.isInvalid() &&
3011 "Reference to invented variable cannot fail!");
3012 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take());
3013 assert(!IterationVarRef.isInvalid() &&
3014 "Conversion of invented variable cannot fail!");
3016 // Subscript the array with this iteration variable.
3017 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc,
3018 IterationVarRef.take(),
3020 if (CtorArg.isInvalid())
3023 BaseType = Array->getElementType();
3026 // The array subscript expression is an lvalue, which is wrong for moving.
3027 if (Moving && InitializingArray)
3028 CtorArg = CastForMoving(SemaRef, CtorArg.take());
3030 // Construct the entity that we will be initializing. For an array, this
3031 // will be first element in the array, which may require several levels
3032 // of array-subscript entities.
3033 SmallVector<InitializedEntity, 4> Entities;
3034 Entities.reserve(1 + IndexVariables.size());
3036 Entities.push_back(InitializedEntity::InitializeMember(Indirect));
3038 Entities.push_back(InitializedEntity::InitializeMember(Field));
3039 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I)
3040 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context,
3044 // Direct-initialize to use the copy constructor.
3045 InitializationKind InitKind =
3046 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation());
3048 Expr *CtorArgE = CtorArg.takeAs<Expr>();
3049 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, CtorArgE);
3051 ExprResult MemberInit
3052 = InitSeq.Perform(SemaRef, Entities.back(), InitKind,
3053 MultiExprArg(&CtorArgE, 1));
3054 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
3055 if (MemberInit.isInvalid())
3059 assert(IndexVariables.size() == 0 &&
3060 "Indirect field improperly initialized");
3062 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect,
3064 MemberInit.takeAs<Expr>(),
3067 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc,
3068 Loc, MemberInit.takeAs<Expr>(),
3070 IndexVariables.data(),
3071 IndexVariables.size());
3075 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) &&
3076 "Unhandled implicit init kind!");
3078 QualType FieldBaseElementType =
3079 SemaRef.Context.getBaseElementType(Field->getType());
3081 if (FieldBaseElementType->isRecordType()) {
3082 InitializedEntity InitEntity
3083 = Indirect? InitializedEntity::InitializeMember(Indirect)
3084 : InitializedEntity::InitializeMember(Field);
3085 InitializationKind InitKind =
3086 InitializationKind::CreateDefault(Loc);
3088 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None);
3089 ExprResult MemberInit =
3090 InitSeq.Perform(SemaRef, InitEntity, InitKind, None);
3092 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
3093 if (MemberInit.isInvalid())
3097 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
3103 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
3110 if (!Field->getParent()->isUnion()) {
3111 if (FieldBaseElementType->isReferenceType()) {
3112 SemaRef.Diag(Constructor->getLocation(),
3113 diag::err_uninitialized_member_in_ctor)
3114 << (int)Constructor->isImplicit()
3115 << SemaRef.Context.getTagDeclType(Constructor->getParent())
3116 << 0 << Field->getDeclName();
3117 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
3121 if (FieldBaseElementType.isConstQualified()) {
3122 SemaRef.Diag(Constructor->getLocation(),
3123 diag::err_uninitialized_member_in_ctor)
3124 << (int)Constructor->isImplicit()
3125 << SemaRef.Context.getTagDeclType(Constructor->getParent())
3126 << 1 << Field->getDeclName();
3127 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
3132 if (SemaRef.getLangOpts().ObjCAutoRefCount &&
3133 FieldBaseElementType->isObjCRetainableType() &&
3134 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None &&
3135 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) {
3137 // Default-initialize Objective-C pointers to NULL.
3139 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field,
3141 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()),
3146 // Nothing to initialize.
3152 struct BaseAndFieldInfo {
3154 CXXConstructorDecl *Ctor;
3155 bool AnyErrorsInInits;
3156 ImplicitInitializerKind IIK;
3157 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields;
3158 SmallVector<CXXCtorInitializer*, 8> AllToInit;
3160 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits)
3161 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) {
3162 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted();
3163 if (Generated && Ctor->isCopyConstructor())
3165 else if (Generated && Ctor->isMoveConstructor())
3167 else if (Ctor->getInheritedConstructor())
3173 bool isImplicitCopyOrMove() const {
3184 llvm_unreachable("Invalid ImplicitInitializerKind!");
3187 bool addFieldInitializer(CXXCtorInitializer *Init) {
3188 AllToInit.push_back(Init);
3190 // Check whether this initializer makes the field "used".
3191 if (Init->getInit()->HasSideEffects(S.Context))
3192 S.UnusedPrivateFields.remove(Init->getAnyMember());
3199 /// \brief Determine whether the given indirect field declaration is somewhere
3200 /// within an anonymous union.
3201 static bool isWithinAnonymousUnion(IndirectFieldDecl *F) {
3202 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(),
3203 CEnd = F->chain_end();
3205 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext()))
3206 if (Record->isUnion())
3212 /// \brief Determine whether the given type is an incomplete or zero-lenfgth
3214 static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) {
3215 if (T->isIncompleteArrayType())
3218 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) {
3219 if (!ArrayT->getSize())
3222 T = ArrayT->getElementType();
3228 static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info,
3230 IndirectFieldDecl *Indirect = 0) {
3232 // Overwhelmingly common case: we have a direct initializer for this field.
3233 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field))
3234 return Info.addFieldInitializer(Init);
3236 // C++11 [class.base.init]p8: if the entity is a non-static data member that
3237 // has a brace-or-equal-initializer, the entity is initialized as specified
3239 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) {
3240 Expr *DIE = CXXDefaultInitExpr::Create(SemaRef.Context,
3241 Info.Ctor->getLocation(), Field);
3242 CXXCtorInitializer *Init;
3244 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect,
3246 SourceLocation(), DIE,
3249 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field,
3251 SourceLocation(), DIE,
3253 return Info.addFieldInitializer(Init);
3256 // Don't build an implicit initializer for union members if none was
3257 // explicitly specified.
3258 if (Field->getParent()->isUnion() ||
3259 (Indirect && isWithinAnonymousUnion(Indirect)))
3262 // Don't initialize incomplete or zero-length arrays.
3263 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType()))
3266 // Don't try to build an implicit initializer if there were semantic
3267 // errors in any of the initializers (and therefore we might be
3268 // missing some that the user actually wrote).
3269 if (Info.AnyErrorsInInits || Field->isInvalidDecl())
3272 CXXCtorInitializer *Init = 0;
3273 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field,
3280 return Info.addFieldInitializer(Init);
3284 Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor,
3285 CXXCtorInitializer *Initializer) {
3286 assert(Initializer->isDelegatingInitializer());
3287 Constructor->setNumCtorInitializers(1);
3288 CXXCtorInitializer **initializer =
3289 new (Context) CXXCtorInitializer*[1];
3290 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*));
3291 Constructor->setCtorInitializers(initializer);
3293 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) {
3294 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor);
3295 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation());
3298 DelegatingCtorDecls.push_back(Constructor);
3303 bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors,
3304 ArrayRef<CXXCtorInitializer *> Initializers) {
3305 if (Constructor->isDependentContext()) {
3306 // Just store the initializers as written, they will be checked during
3308 if (!Initializers.empty()) {
3309 Constructor->setNumCtorInitializers(Initializers.size());
3310 CXXCtorInitializer **baseOrMemberInitializers =
3311 new (Context) CXXCtorInitializer*[Initializers.size()];
3312 memcpy(baseOrMemberInitializers, Initializers.data(),
3313 Initializers.size() * sizeof(CXXCtorInitializer*));
3314 Constructor->setCtorInitializers(baseOrMemberInitializers);
3317 // Let template instantiation know whether we had errors.
3319 Constructor->setInvalidDecl();
3324 BaseAndFieldInfo Info(*this, Constructor, AnyErrors);
3326 // We need to build the initializer AST according to order of construction
3327 // and not what user specified in the Initializers list.
3328 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition();
3332 bool HadError = false;
3334 for (unsigned i = 0; i < Initializers.size(); i++) {
3335 CXXCtorInitializer *Member = Initializers[i];
3337 if (Member->isBaseInitializer())
3338 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member;
3340 Info.AllBaseFields[Member->getAnyMember()] = Member;
3343 // Keep track of the direct virtual bases.
3344 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases;
3345 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(),
3346 E = ClassDecl->bases_end(); I != E; ++I) {
3348 DirectVBases.insert(I);
3351 // Push virtual bases before others.
3352 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(),
3353 E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
3355 if (CXXCtorInitializer *Value
3356 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) {
3357 Info.AllToInit.push_back(Value);
3358 } else if (!AnyErrors) {
3359 bool IsInheritedVirtualBase = !DirectVBases.count(VBase);
3360 CXXCtorInitializer *CXXBaseInit;
3361 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
3362 VBase, IsInheritedVirtualBase,
3368 Info.AllToInit.push_back(CXXBaseInit);
3372 // Non-virtual bases.
3373 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
3374 E = ClassDecl->bases_end(); Base != E; ++Base) {
3375 // Virtuals are in the virtual base list and already constructed.
3376 if (Base->isVirtual())
3379 if (CXXCtorInitializer *Value
3380 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) {
3381 Info.AllToInit.push_back(Value);
3382 } else if (!AnyErrors) {
3383 CXXCtorInitializer *CXXBaseInit;
3384 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
3385 Base, /*IsInheritedVirtualBase=*/false,
3391 Info.AllToInit.push_back(CXXBaseInit);
3396 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(),
3397 MemEnd = ClassDecl->decls_end();
3398 Mem != MemEnd; ++Mem) {
3399 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) {
3400 // C++ [class.bit]p2:
3401 // A declaration for a bit-field that omits the identifier declares an
3402 // unnamed bit-field. Unnamed bit-fields are not members and cannot be
3404 if (F->isUnnamedBitfield())
3407 // If we're not generating the implicit copy/move constructor, then we'll
3408 // handle anonymous struct/union fields based on their individual
3410 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove())
3413 if (CollectFieldInitializer(*this, Info, F))
3418 // Beyond this point, we only consider default initialization.
3419 if (Info.isImplicitCopyOrMove())
3422 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) {
3423 if (F->getType()->isIncompleteArrayType()) {
3424 assert(ClassDecl->hasFlexibleArrayMember() &&
3425 "Incomplete array type is not valid");
3429 // Initialize each field of an anonymous struct individually.
3430 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F))
3437 unsigned NumInitializers = Info.AllToInit.size();
3438 if (NumInitializers > 0) {
3439 Constructor->setNumCtorInitializers(NumInitializers);
3440 CXXCtorInitializer **baseOrMemberInitializers =
3441 new (Context) CXXCtorInitializer*[NumInitializers];
3442 memcpy(baseOrMemberInitializers, Info.AllToInit.data(),
3443 NumInitializers * sizeof(CXXCtorInitializer*));
3444 Constructor->setCtorInitializers(baseOrMemberInitializers);
3446 // Constructors implicitly reference the base and member
3448 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(),
3449 Constructor->getParent());
3455 static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) {
3456 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) {
3457 const RecordDecl *RD = RT->getDecl();
3458 if (RD->isAnonymousStructOrUnion()) {
3459 for (RecordDecl::field_iterator Field = RD->field_begin(),
3460 E = RD->field_end(); Field != E; ++Field)
3461 PopulateKeysForFields(*Field, IdealInits);
3465 IdealInits.push_back(Field);
3468 static void *GetKeyForBase(ASTContext &Context, QualType BaseType) {
3469 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr());
3472 static void *GetKeyForMember(ASTContext &Context,
3473 CXXCtorInitializer *Member) {
3474 if (!Member->isAnyMemberInitializer())
3475 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0));
3477 return Member->getAnyMember();
3480 static void DiagnoseBaseOrMemInitializerOrder(
3481 Sema &SemaRef, const CXXConstructorDecl *Constructor,
3482 ArrayRef<CXXCtorInitializer *> Inits) {
3483 if (Constructor->getDeclContext()->isDependentContext())
3486 // Don't check initializers order unless the warning is enabled at the
3487 // location of at least one initializer.
3488 bool ShouldCheckOrder = false;
3489 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) {
3490 CXXCtorInitializer *Init = Inits[InitIndex];
3491 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order,
3492 Init->getSourceLocation())
3493 != DiagnosticsEngine::Ignored) {
3494 ShouldCheckOrder = true;
3498 if (!ShouldCheckOrder)
3501 // Build the list of bases and members in the order that they'll
3502 // actually be initialized. The explicit initializers should be in
3503 // this same order but may be missing things.
3504 SmallVector<const void*, 32> IdealInitKeys;
3506 const CXXRecordDecl *ClassDecl = Constructor->getParent();
3508 // 1. Virtual bases.
3509 for (CXXRecordDecl::base_class_const_iterator VBase =
3510 ClassDecl->vbases_begin(),
3511 E = ClassDecl->vbases_end(); VBase != E; ++VBase)
3512 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType()));
3514 // 2. Non-virtual bases.
3515 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(),
3516 E = ClassDecl->bases_end(); Base != E; ++Base) {
3517 if (Base->isVirtual())
3519 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType()));
3522 // 3. Direct fields.
3523 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
3524 E = ClassDecl->field_end(); Field != E; ++Field) {
3525 if (Field->isUnnamedBitfield())
3528 PopulateKeysForFields(*Field, IdealInitKeys);
3531 unsigned NumIdealInits = IdealInitKeys.size();
3532 unsigned IdealIndex = 0;
3534 CXXCtorInitializer *PrevInit = 0;
3535 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) {
3536 CXXCtorInitializer *Init = Inits[InitIndex];
3537 void *InitKey = GetKeyForMember(SemaRef.Context, Init);
3539 // Scan forward to try to find this initializer in the idealized
3540 // initializers list.
3541 for (; IdealIndex != NumIdealInits; ++IdealIndex)
3542 if (InitKey == IdealInitKeys[IdealIndex])
3545 // If we didn't find this initializer, it must be because we
3546 // scanned past it on a previous iteration. That can only
3547 // happen if we're out of order; emit a warning.
3548 if (IdealIndex == NumIdealInits && PrevInit) {
3549 Sema::SemaDiagnosticBuilder D =
3550 SemaRef.Diag(PrevInit->getSourceLocation(),
3551 diag::warn_initializer_out_of_order);
3553 if (PrevInit->isAnyMemberInitializer())
3554 D << 0 << PrevInit->getAnyMember()->getDeclName();
3556 D << 1 << PrevInit->getTypeSourceInfo()->getType();
3558 if (Init->isAnyMemberInitializer())
3559 D << 0 << Init->getAnyMember()->getDeclName();
3561 D << 1 << Init->getTypeSourceInfo()->getType();
3563 // Move back to the initializer's location in the ideal list.
3564 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex)
3565 if (InitKey == IdealInitKeys[IdealIndex])
3568 assert(IdealIndex != NumIdealInits &&
3569 "initializer not found in initializer list");
3577 bool CheckRedundantInit(Sema &S,
3578 CXXCtorInitializer *Init,
3579 CXXCtorInitializer *&PrevInit) {
3585 if (FieldDecl *Field = Init->getAnyMember())
3586 S.Diag(Init->getSourceLocation(),
3587 diag::err_multiple_mem_initialization)
3588 << Field->getDeclName()
3589 << Init->getSourceRange();
3591 const Type *BaseClass = Init->getBaseClass();
3592 assert(BaseClass && "neither field nor base");
3593 S.Diag(Init->getSourceLocation(),
3594 diag::err_multiple_base_initialization)
3595 << QualType(BaseClass, 0)
3596 << Init->getSourceRange();
3598 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer)
3599 << 0 << PrevInit->getSourceRange();
3604 typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry;
3605 typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap;
3607 bool CheckRedundantUnionInit(Sema &S,
3608 CXXCtorInitializer *Init,
3609 RedundantUnionMap &Unions) {
3610 FieldDecl *Field = Init->getAnyMember();
3611 RecordDecl *Parent = Field->getParent();
3612 NamedDecl *Child = Field;
3614 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) {
3615 if (Parent->isUnion()) {
3616 UnionEntry &En = Unions[Parent];
3617 if (En.first && En.first != Child) {
3618 S.Diag(Init->getSourceLocation(),
3619 diag::err_multiple_mem_union_initialization)
3620 << Field->getDeclName()
3621 << Init->getSourceRange();
3622 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer)
3623 << 0 << En.second->getSourceRange();
3630 if (!Parent->isAnonymousStructOrUnion())
3635 Parent = cast<RecordDecl>(Parent->getDeclContext());
3642 /// ActOnMemInitializers - Handle the member initializers for a constructor.
3643 void Sema::ActOnMemInitializers(Decl *ConstructorDecl,
3644 SourceLocation ColonLoc,
3645 ArrayRef<CXXCtorInitializer*> MemInits,
3647 if (!ConstructorDecl)
3650 AdjustDeclIfTemplate(ConstructorDecl);
3652 CXXConstructorDecl *Constructor
3653 = dyn_cast<CXXConstructorDecl>(ConstructorDecl);
3656 Diag(ColonLoc, diag::err_only_constructors_take_base_inits);
3660 // Mapping for the duplicate initializers check.
3661 // For member initializers, this is keyed with a FieldDecl*.
3662 // For base initializers, this is keyed with a Type*.
3663 llvm::DenseMap<void*, CXXCtorInitializer *> Members;
3665 // Mapping for the inconsistent anonymous-union initializers check.
3666 RedundantUnionMap MemberUnions;
3668 bool HadError = false;
3669 for (unsigned i = 0; i < MemInits.size(); i++) {
3670 CXXCtorInitializer *Init = MemInits[i];
3672 // Set the source order index.
3673 Init->setSourceOrder(i);
3675 if (Init->isAnyMemberInitializer()) {
3676 FieldDecl *Field = Init->getAnyMember();
3677 if (CheckRedundantInit(*this, Init, Members[Field]) ||
3678 CheckRedundantUnionInit(*this, Init, MemberUnions))
3680 } else if (Init->isBaseInitializer()) {
3681 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0));
3682 if (CheckRedundantInit(*this, Init, Members[Key]))
3685 assert(Init->isDelegatingInitializer());
3686 // This must be the only initializer
3687 if (MemInits.size() != 1) {
3688 Diag(Init->getSourceLocation(),
3689 diag::err_delegating_initializer_alone)
3690 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange();
3691 // We will treat this as being the only initializer.
3693 SetDelegatingInitializer(Constructor, MemInits[i]);
3694 // Return immediately as the initializer is set.
3702 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits);
3704 SetCtorInitializers(Constructor, AnyErrors, MemInits);
3708 Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location,
3709 CXXRecordDecl *ClassDecl) {
3710 // Ignore dependent contexts. Also ignore unions, since their members never
3711 // have destructors implicitly called.
3712 if (ClassDecl->isDependentContext() || ClassDecl->isUnion())
3715 // FIXME: all the access-control diagnostics are positioned on the
3716 // field/base declaration. That's probably good; that said, the
3717 // user might reasonably want to know why the destructor is being
3718 // emitted, and we currently don't say.
3720 // Non-static data members.
3721 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(),
3722 E = ClassDecl->field_end(); I != E; ++I) {
3723 FieldDecl *Field = *I;
3724 if (Field->isInvalidDecl())
3727 // Don't destroy incomplete or zero-length arrays.
3728 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType()))
3731 QualType FieldType = Context.getBaseElementType(Field->getType());
3733 const RecordType* RT = FieldType->getAs<RecordType>();
3737 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
3738 if (FieldClassDecl->isInvalidDecl())
3740 if (FieldClassDecl->hasIrrelevantDestructor())
3742 // The destructor for an implicit anonymous union member is never invoked.
3743 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion())
3746 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl);
3747 assert(Dtor && "No dtor found for FieldClassDecl!");
3748 CheckDestructorAccess(Field->getLocation(), Dtor,
3749 PDiag(diag::err_access_dtor_field)
3750 << Field->getDeclName()
3753 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor));
3754 DiagnoseUseOfDecl(Dtor, Location);
3757 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases;
3760 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
3761 E = ClassDecl->bases_end(); Base != E; ++Base) {
3762 // Bases are always records in a well-formed non-dependent class.
3763 const RecordType *RT = Base->getType()->getAs<RecordType>();
3765 // Remember direct virtual bases.
3766 if (Base->isVirtual())
3767 DirectVirtualBases.insert(RT);
3769 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
3770 // If our base class is invalid, we probably can't get its dtor anyway.
3771 if (BaseClassDecl->isInvalidDecl())
3773 if (BaseClassDecl->hasIrrelevantDestructor())
3776 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
3777 assert(Dtor && "No dtor found for BaseClassDecl!");
3779 // FIXME: caret should be on the start of the class name
3780 CheckDestructorAccess(Base->getLocStart(), Dtor,
3781 PDiag(diag::err_access_dtor_base)
3783 << Base->getSourceRange(),
3784 Context.getTypeDeclType(ClassDecl));
3786 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor));
3787 DiagnoseUseOfDecl(Dtor, Location);
3791 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(),
3792 E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
3794 // Bases are always records in a well-formed non-dependent class.
3795 const RecordType *RT = VBase->getType()->castAs<RecordType>();
3797 // Ignore direct virtual bases.
3798 if (DirectVirtualBases.count(RT))
3801 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
3802 // If our base class is invalid, we probably can't get its dtor anyway.
3803 if (BaseClassDecl->isInvalidDecl())
3805 if (BaseClassDecl->hasIrrelevantDestructor())
3808 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
3809 assert(Dtor && "No dtor found for BaseClassDecl!");
3810 CheckDestructorAccess(ClassDecl->getLocation(), Dtor,
3811 PDiag(diag::err_access_dtor_vbase)
3812 << VBase->getType(),
3813 Context.getTypeDeclType(ClassDecl));
3815 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor));
3816 DiagnoseUseOfDecl(Dtor, Location);
3820 void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) {
3824 if (CXXConstructorDecl *Constructor
3825 = dyn_cast<CXXConstructorDecl>(CDtorDecl))
3826 SetCtorInitializers(Constructor, /*AnyErrors=*/false);
3829 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
3830 unsigned DiagID, AbstractDiagSelID SelID) {
3831 class NonAbstractTypeDiagnoser : public TypeDiagnoser {
3833 AbstractDiagSelID SelID;
3836 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID)
3837 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { }
3839 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) {
3840 if (Suppressed) return;
3842 S.Diag(Loc, DiagID) << T;
3844 S.Diag(Loc, DiagID) << SelID << T;
3846 } Diagnoser(DiagID, SelID);
3848 return RequireNonAbstractType(Loc, T, Diagnoser);
3851 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
3852 TypeDiagnoser &Diagnoser) {
3853 if (!getLangOpts().CPlusPlus)
3856 if (const ArrayType *AT = Context.getAsArrayType(T))
3857 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser);
3859 if (const PointerType *PT = T->getAs<PointerType>()) {
3860 // Find the innermost pointer type.
3861 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>())
3864 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType()))
3865 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser);
3868 const RecordType *RT = T->getAs<RecordType>();
3872 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
3874 // We can't answer whether something is abstract until it has a
3875 // definition. If it's currently being defined, we'll walk back
3876 // over all the declarations when we have a full definition.
3877 const CXXRecordDecl *Def = RD->getDefinition();
3878 if (!Def || Def->isBeingDefined())
3881 if (!RD->isAbstract())
3884 Diagnoser.diagnose(*this, Loc, T);
3885 DiagnoseAbstractType(RD);
3890 void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) {
3891 // Check if we've already emitted the list of pure virtual functions
3893 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD))
3896 CXXFinalOverriderMap FinalOverriders;
3897 RD->getFinalOverriders(FinalOverriders);
3899 // Keep a set of seen pure methods so we won't diagnose the same method
3901 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods;
3903 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
3904 MEnd = FinalOverriders.end();
3907 for (OverridingMethods::iterator SO = M->second.begin(),
3908 SOEnd = M->second.end();
3909 SO != SOEnd; ++SO) {
3910 // C++ [class.abstract]p4:
3911 // A class is abstract if it contains or inherits at least one
3912 // pure virtual function for which the final overrider is pure
3916 if (SO->second.size() != 1)
3919 if (!SO->second.front().Method->isPure())
3922 if (!SeenPureMethods.insert(SO->second.front().Method))
3925 Diag(SO->second.front().Method->getLocation(),
3926 diag::note_pure_virtual_function)
3927 << SO->second.front().Method->getDeclName() << RD->getDeclName();
3931 if (!PureVirtualClassDiagSet)
3932 PureVirtualClassDiagSet.reset(new RecordDeclSetTy);
3933 PureVirtualClassDiagSet->insert(RD);
3937 struct AbstractUsageInfo {
3939 CXXRecordDecl *Record;
3940 CanQualType AbstractType;
3943 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record)
3944 : S(S), Record(Record),
3945 AbstractType(S.Context.getCanonicalType(
3946 S.Context.getTypeDeclType(Record))),
3949 void DiagnoseAbstractType() {
3950 if (Invalid) return;
3951 S.DiagnoseAbstractType(Record);
3955 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel);
3958 struct CheckAbstractUsage {
3959 AbstractUsageInfo &Info;
3960 const NamedDecl *Ctx;
3962 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx)
3963 : Info(Info), Ctx(Ctx) {}
3965 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
3966 switch (TL.getTypeLocClass()) {
3967 #define ABSTRACT_TYPELOC(CLASS, PARENT)
3968 #define TYPELOC(CLASS, PARENT) \
3969 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break;
3970 #include "clang/AST/TypeLocNodes.def"
3974 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) {
3975 Visit(TL.getResultLoc(), Sema::AbstractReturnType);
3976 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
3980 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo();
3981 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType);
3985 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) {
3986 Visit(TL.getElementLoc(), Sema::AbstractArrayType);
3989 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) {
3990 // Visit the type parameters from a permissive context.
3991 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
3992 TemplateArgumentLoc TAL = TL.getArgLoc(I);
3993 if (TAL.getArgument().getKind() == TemplateArgument::Type)
3994 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo())
3995 Visit(TSI->getTypeLoc(), Sema::AbstractNone);
3996 // TODO: other template argument types?
4000 // Visit pointee types from a permissive context.
4001 #define CheckPolymorphic(Type) \
4002 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \
4003 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \
4005 CheckPolymorphic(PointerTypeLoc)
4006 CheckPolymorphic(ReferenceTypeLoc)
4007 CheckPolymorphic(MemberPointerTypeLoc)
4008 CheckPolymorphic(BlockPointerTypeLoc)
4009 CheckPolymorphic(AtomicTypeLoc)
4011 /// Handle all the types we haven't given a more specific
4012 /// implementation for above.
4013 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
4014 // Every other kind of type that we haven't called out already
4015 // that has an inner type is either (1) sugar or (2) contains that
4016 // inner type in some way as a subobject.
4017 if (TypeLoc Next = TL.getNextTypeLoc())
4018 return Visit(Next, Sel);
4020 // If there's no inner type and we're in a permissive context,
4022 if (Sel == Sema::AbstractNone) return;
4024 // Check whether the type matches the abstract type.
4025 QualType T = TL.getType();
4026 if (T->isArrayType()) {
4027 Sel = Sema::AbstractArrayType;
4028 T = Info.S.Context.getBaseElementType(T);
4030 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType();
4031 if (CT != Info.AbstractType) return;
4033 // It matched; do some magic.
4034 if (Sel == Sema::AbstractArrayType) {
4035 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type)
4036 << T << TL.getSourceRange();
4038 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl)
4039 << Sel << T << TL.getSourceRange();
4041 Info.DiagnoseAbstractType();
4045 void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL,
4046 Sema::AbstractDiagSelID Sel) {
4047 CheckAbstractUsage(*this, D).Visit(TL, Sel);
4052 /// Check for invalid uses of an abstract type in a method declaration.
4053 static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
4054 CXXMethodDecl *MD) {
4055 // No need to do the check on definitions, which require that
4056 // the return/param types be complete.
4057 if (MD->doesThisDeclarationHaveABody())
4060 // For safety's sake, just ignore it if we don't have type source
4061 // information. This should never happen for non-implicit methods,
4063 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
4064 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone);
4067 /// Check for invalid uses of an abstract type within a class definition.
4068 static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
4069 CXXRecordDecl *RD) {
4070 for (CXXRecordDecl::decl_iterator
4071 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) {
4073 if (D->isImplicit()) continue;
4075 // Methods and method templates.
4076 if (isa<CXXMethodDecl>(D)) {
4077 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D));
4078 } else if (isa<FunctionTemplateDecl>(D)) {
4079 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl();
4080 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD));
4082 // Fields and static variables.
4083 } else if (isa<FieldDecl>(D)) {
4084 FieldDecl *FD = cast<FieldDecl>(D);
4085 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo())
4086 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType);
4087 } else if (isa<VarDecl>(D)) {
4088 VarDecl *VD = cast<VarDecl>(D);
4089 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo())
4090 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType);
4092 // Nested classes and class templates.
4093 } else if (isa<CXXRecordDecl>(D)) {
4094 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D));
4095 } else if (isa<ClassTemplateDecl>(D)) {
4096 CheckAbstractClassUsage(Info,
4097 cast<ClassTemplateDecl>(D)->getTemplatedDecl());
4102 /// \brief Perform semantic checks on a class definition that has been
4103 /// completing, introducing implicitly-declared members, checking for
4104 /// abstract types, etc.
4105 void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) {
4109 if (Record->isAbstract() && !Record->isInvalidDecl()) {
4110 AbstractUsageInfo Info(*this, Record);
4111 CheckAbstractClassUsage(Info, Record);
4114 // If this is not an aggregate type and has no user-declared constructor,
4115 // complain about any non-static data members of reference or const scalar
4116 // type, since they will never get initializers.
4117 if (!Record->isInvalidDecl() && !Record->isDependentType() &&
4118 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() &&
4119 !Record->isLambda()) {
4120 bool Complained = false;
4121 for (RecordDecl::field_iterator F = Record->field_begin(),
4122 FEnd = Record->field_end();
4124 if (F->hasInClassInitializer() || F->isUnnamedBitfield())
4127 if (F->getType()->isReferenceType() ||
4128 (F->getType().isConstQualified() && F->getType()->isScalarType())) {
4130 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst)
4131 << Record->getTagKind() << Record;
4135 Diag(F->getLocation(), diag::note_refconst_member_not_initialized)
4136 << F->getType()->isReferenceType()
4137 << F->getDeclName();
4142 if (Record->isDynamicClass() && !Record->isDependentType())
4143 DynamicClasses.push_back(Record);
4145 if (Record->getIdentifier()) {
4146 // C++ [class.mem]p13:
4147 // If T is the name of a class, then each of the following shall have a
4148 // name different from T:
4149 // - every member of every anonymous union that is a member of class T.
4151 // C++ [class.mem]p14:
4152 // In addition, if class T has a user-declared constructor (12.1), every
4153 // non-static data member of class T shall have a name different from T.
4154 DeclContext::lookup_result R = Record->lookup(Record->getDeclName());
4155 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E;
4158 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) ||
4159 isa<IndirectFieldDecl>(D)) {
4160 Diag(D->getLocation(), diag::err_member_name_of_class)
4161 << D->getDeclName();
4167 // Warn if the class has virtual methods but non-virtual public destructor.
4168 if (Record->isPolymorphic() && !Record->isDependentType()) {
4169 CXXDestructorDecl *dtor = Record->getDestructor();
4170 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public))
4171 Diag(dtor ? dtor->getLocation() : Record->getLocation(),
4172 diag::warn_non_virtual_dtor) << Context.getRecordType(Record);
4175 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) {
4176 Diag(Record->getLocation(), diag::warn_abstract_final_class);
4177 DiagnoseAbstractType(Record);
4180 if (!Record->isDependentType()) {
4181 for (CXXRecordDecl::method_iterator M = Record->method_begin(),
4182 MEnd = Record->method_end();
4184 // See if a method overloads virtual methods in a base
4185 // class without overriding any.
4187 DiagnoseHiddenVirtualMethods(Record, *M);
4189 // Check whether the explicitly-defaulted special members are valid.
4190 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted())
4191 CheckExplicitlyDefaultedSpecialMember(*M);
4193 // For an explicitly defaulted or deleted special member, we defer
4194 // determining triviality until the class is complete. That time is now!
4195 if (!M->isImplicit() && !M->isUserProvided()) {
4196 CXXSpecialMember CSM = getSpecialMember(*M);
4197 if (CSM != CXXInvalid) {
4198 M->setTrivial(SpecialMemberIsTrivial(*M, CSM));
4200 // Inform the class that we've finished declaring this member.
4201 Record->finishedDefaultedOrDeletedMember(*M);
4207 // C++11 [dcl.constexpr]p8: A constexpr specifier for a non-static member
4208 // function that is not a constructor declares that member function to be
4209 // const. [...] The class of which that function is a member shall be
4212 // If the class has virtual bases, any constexpr members will already have
4213 // been diagnosed by the checks performed on the member declaration, so
4214 // suppress this (less useful) diagnostic.
4216 // We delay this until we know whether an explicitly-defaulted (or deleted)
4217 // destructor for the class is trivial.
4218 if (LangOpts.CPlusPlus11 && !Record->isDependentType() &&
4219 !Record->isLiteral() && !Record->getNumVBases()) {
4220 for (CXXRecordDecl::method_iterator M = Record->method_begin(),
4221 MEnd = Record->method_end();
4223 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) {
4224 switch (Record->getTemplateSpecializationKind()) {
4225 case TSK_ImplicitInstantiation:
4226 case TSK_ExplicitInstantiationDeclaration:
4227 case TSK_ExplicitInstantiationDefinition:
4228 // If a template instantiates to a non-literal type, but its members
4229 // instantiate to constexpr functions, the template is technically
4230 // ill-formed, but we allow it for sanity.
4233 case TSK_Undeclared:
4234 case TSK_ExplicitSpecialization:
4235 RequireLiteralType(M->getLocation(), Context.getRecordType(Record),
4236 diag::err_constexpr_method_non_literal);
4240 // Only produce one error per class.
4246 // Declare inheriting constructors. We do this eagerly here because:
4247 // - The standard requires an eager diagnostic for conflicting inheriting
4248 // constructors from different classes.
4249 // - The lazy declaration of the other implicit constructors is so as to not
4250 // waste space and performance on classes that are not meant to be
4251 // instantiated (e.g. meta-functions). This doesn't apply to classes that
4252 // have inheriting constructors.
4253 DeclareInheritingConstructors(Record);
4256 /// Is the special member function which would be selected to perform the
4257 /// specified operation on the specified class type a constexpr constructor?
4258 static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl,
4259 Sema::CXXSpecialMember CSM,
4261 Sema::SpecialMemberOverloadResult *SMOR =
4262 S.LookupSpecialMember(ClassDecl, CSM, ConstArg,
4263 false, false, false, false);
4264 if (!SMOR || !SMOR->getMethod())
4265 // A constructor we wouldn't select can't be "involved in initializing"
4268 return SMOR->getMethod()->isConstexpr();
4271 /// Determine whether the specified special member function would be constexpr
4272 /// if it were implicitly defined.
4273 static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl,
4274 Sema::CXXSpecialMember CSM,
4276 if (!S.getLangOpts().CPlusPlus11)
4279 // C++11 [dcl.constexpr]p4:
4280 // In the definition of a constexpr constructor [...]
4282 case Sema::CXXDefaultConstructor:
4283 // Since default constructor lookup is essentially trivial (and cannot
4284 // involve, for instance, template instantiation), we compute whether a
4285 // defaulted default constructor is constexpr directly within CXXRecordDecl.
4287 // This is important for performance; we need to know whether the default
4288 // constructor is constexpr to determine whether the type is a literal type.
4289 return ClassDecl->defaultedDefaultConstructorIsConstexpr();
4291 case Sema::CXXCopyConstructor:
4292 case Sema::CXXMoveConstructor:
4293 // For copy or move constructors, we need to perform overload resolution.
4296 case Sema::CXXCopyAssignment:
4297 case Sema::CXXMoveAssignment:
4298 case Sema::CXXDestructor:
4299 case Sema::CXXInvalid:
4303 // -- if the class is a non-empty union, or for each non-empty anonymous
4304 // union member of a non-union class, exactly one non-static data member
4305 // shall be initialized; [DR1359]
4307 // If we squint, this is guaranteed, since exactly one non-static data member
4308 // will be initialized (if the constructor isn't deleted), we just don't know
4310 if (ClassDecl->isUnion())
4313 // -- the class shall not have any virtual base classes;
4314 if (ClassDecl->getNumVBases())
4317 // -- every constructor involved in initializing [...] base class
4318 // sub-objects shall be a constexpr constructor;
4319 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
4320 BEnd = ClassDecl->bases_end();
4322 const RecordType *BaseType = B->getType()->getAs<RecordType>();
4323 if (!BaseType) continue;
4325 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
4326 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg))
4330 // -- every constructor involved in initializing non-static data members
4331 // [...] shall be a constexpr constructor;
4332 // -- every non-static data member and base class sub-object shall be
4334 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
4335 FEnd = ClassDecl->field_end();
4337 if (F->isInvalidDecl())
4339 if (const RecordType *RecordTy =
4340 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) {
4341 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
4342 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg))
4347 // All OK, it's constexpr!
4351 static Sema::ImplicitExceptionSpecification
4352 computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) {
4353 switch (S.getSpecialMember(MD)) {
4354 case Sema::CXXDefaultConstructor:
4355 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD);
4356 case Sema::CXXCopyConstructor:
4357 return S.ComputeDefaultedCopyCtorExceptionSpec(MD);
4358 case Sema::CXXCopyAssignment:
4359 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD);
4360 case Sema::CXXMoveConstructor:
4361 return S.ComputeDefaultedMoveCtorExceptionSpec(MD);
4362 case Sema::CXXMoveAssignment:
4363 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD);
4364 case Sema::CXXDestructor:
4365 return S.ComputeDefaultedDtorExceptionSpec(MD);
4366 case Sema::CXXInvalid:
4369 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() &&
4370 "only special members have implicit exception specs");
4371 return S.ComputeInheritingCtorExceptionSpec(cast<CXXConstructorDecl>(MD));
4375 updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT,
4376 const Sema::ImplicitExceptionSpecification &ExceptSpec) {
4377 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
4378 ExceptSpec.getEPI(EPI);
4379 FD->setType(S.Context.getFunctionType(FPT->getResultType(),
4380 FPT->getArgTypes(), EPI));
4383 void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) {
4384 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
4385 if (FPT->getExceptionSpecType() != EST_Unevaluated)
4388 // Evaluate the exception specification.
4389 ImplicitExceptionSpecification ExceptSpec =
4390 computeImplicitExceptionSpec(*this, Loc, MD);
4392 // Update the type of the special member to use it.
4393 updateExceptionSpec(*this, MD, FPT, ExceptSpec);
4395 // A user-provided destructor can be defined outside the class. When that
4396 // happens, be sure to update the exception specification on both
4398 const FunctionProtoType *CanonicalFPT =
4399 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>();
4400 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated)
4401 updateExceptionSpec(*this, MD->getCanonicalDecl(),
4402 CanonicalFPT, ExceptSpec);
4405 void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) {
4406 CXXRecordDecl *RD = MD->getParent();
4407 CXXSpecialMember CSM = getSpecialMember(MD);
4409 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid &&
4410 "not an explicitly-defaulted special member");
4412 // Whether this was the first-declared instance of the constructor.
4413 // This affects whether we implicitly add an exception spec and constexpr.
4414 bool First = MD == MD->getCanonicalDecl();
4416 bool HadError = false;
4418 // C++11 [dcl.fct.def.default]p1:
4419 // A function that is explicitly defaulted shall
4420 // -- be a special member function (checked elsewhere),
4421 // -- have the same type (except for ref-qualifiers, and except that a
4422 // copy operation can take a non-const reference) as an implicit
4424 // -- not have default arguments.
4425 unsigned ExpectedParams = 1;
4426 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor)
4428 if (MD->getNumParams() != ExpectedParams) {
4429 // This also checks for default arguments: a copy or move constructor with a
4430 // default argument is classified as a default constructor, and assignment
4431 // operations and destructors can't have default arguments.
4432 Diag(MD->getLocation(), diag::err_defaulted_special_member_params)
4433 << CSM << MD->getSourceRange();
4435 } else if (MD->isVariadic()) {
4436 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic)
4437 << CSM << MD->getSourceRange();
4441 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>();
4443 bool CanHaveConstParam = false;
4444 if (CSM == CXXCopyConstructor)
4445 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam();
4446 else if (CSM == CXXCopyAssignment)
4447 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam();
4449 QualType ReturnType = Context.VoidTy;
4450 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) {
4451 // Check for return type matching.
4452 ReturnType = Type->getResultType();
4453 QualType ExpectedReturnType =
4454 Context.getLValueReferenceType(Context.getTypeDeclType(RD));
4455 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) {
4456 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type)
4457 << (CSM == CXXMoveAssignment) << ExpectedReturnType;
4461 // A defaulted special member cannot have cv-qualifiers.
4462 if (Type->getTypeQuals()) {
4463 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals)
4464 << (CSM == CXXMoveAssignment);
4469 // Check for parameter type matching.
4470 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType();
4471 bool HasConstParam = false;
4472 if (ExpectedParams && ArgType->isReferenceType()) {
4473 // Argument must be reference to possibly-const T.
4474 QualType ReferentType = ArgType->getPointeeType();
4475 HasConstParam = ReferentType.isConstQualified();
4477 if (ReferentType.isVolatileQualified()) {
4478 Diag(MD->getLocation(),
4479 diag::err_defaulted_special_member_volatile_param) << CSM;
4483 if (HasConstParam && !CanHaveConstParam) {
4484 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) {
4485 Diag(MD->getLocation(),
4486 diag::err_defaulted_special_member_copy_const_param)
4487 << (CSM == CXXCopyAssignment);
4488 // FIXME: Explain why this special member can't be const.
4490 Diag(MD->getLocation(),
4491 diag::err_defaulted_special_member_move_const_param)
4492 << (CSM == CXXMoveAssignment);
4496 } else if (ExpectedParams) {
4497 // A copy assignment operator can take its argument by value, but a
4498 // defaulted one cannot.
4499 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument");
4500 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref);
4504 // C++11 [dcl.fct.def.default]p2:
4505 // An explicitly-defaulted function may be declared constexpr only if it
4506 // would have been implicitly declared as constexpr,
4507 // Do not apply this rule to members of class templates, since core issue 1358
4508 // makes such functions always instantiate to constexpr functions. For
4509 // non-constructors, this is checked elsewhere.
4510 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM,
4512 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr &&
4513 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) {
4514 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM;
4515 // FIXME: Explain why the constructor can't be constexpr.
4519 // and may have an explicit exception-specification only if it is compatible
4520 // with the exception-specification on the implicit declaration.
4521 if (Type->hasExceptionSpec()) {
4522 // Delay the check if this is the first declaration of the special member,
4523 // since we may not have parsed some necessary in-class initializers yet.
4525 // If the exception specification needs to be instantiated, do so now,
4526 // before we clobber it with an EST_Unevaluated specification below.
4527 if (Type->getExceptionSpecType() == EST_Uninstantiated) {
4528 InstantiateExceptionSpec(MD->getLocStart(), MD);
4529 Type = MD->getType()->getAs<FunctionProtoType>();
4531 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type));
4533 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type);
4536 // If a function is explicitly defaulted on its first declaration,
4538 // -- it is implicitly considered to be constexpr if the implicit
4539 // definition would be,
4540 MD->setConstexpr(Constexpr);
4542 // -- it is implicitly considered to have the same exception-specification
4543 // as if it had been implicitly declared,
4544 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo();
4545 EPI.ExceptionSpecType = EST_Unevaluated;
4546 EPI.ExceptionSpecDecl = MD;
4547 MD->setType(Context.getFunctionType(ReturnType,
4548 ArrayRef<QualType>(&ArgType,
4553 if (ShouldDeleteSpecialMember(MD, CSM)) {
4555 SetDeclDeleted(MD, MD->getLocation());
4557 // C++11 [dcl.fct.def.default]p4:
4558 // [For a] user-provided explicitly-defaulted function [...] if such a
4559 // function is implicitly defined as deleted, the program is ill-formed.
4560 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM;
4566 MD->setInvalidDecl();
4569 /// Check whether the exception specification provided for an
4570 /// explicitly-defaulted special member matches the exception specification
4571 /// that would have been generated for an implicit special member, per
4572 /// C++11 [dcl.fct.def.default]p2.
4573 void Sema::CheckExplicitlyDefaultedMemberExceptionSpec(
4574 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) {
4575 // Compute the implicit exception specification.
4576 FunctionProtoType::ExtProtoInfo EPI;
4577 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI);
4578 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>(
4579 Context.getFunctionType(Context.VoidTy, None, EPI));
4581 // Ensure that it matches.
4582 CheckEquivalentExceptionSpec(
4583 PDiag(diag::err_incorrect_defaulted_exception_spec)
4584 << getSpecialMember(MD), PDiag(),
4585 ImplicitType, SourceLocation(),
4586 SpecifiedType, MD->getLocation());
4589 void Sema::CheckDelayedExplicitlyDefaultedMemberExceptionSpecs() {
4590 for (unsigned I = 0, N = DelayedDefaultedMemberExceptionSpecs.size();
4592 CheckExplicitlyDefaultedMemberExceptionSpec(
4593 DelayedDefaultedMemberExceptionSpecs[I].first,
4594 DelayedDefaultedMemberExceptionSpecs[I].second);
4596 DelayedDefaultedMemberExceptionSpecs.clear();
4600 struct SpecialMemberDeletionInfo {
4603 Sema::CXXSpecialMember CSM;
4606 // Properties of the special member, computed for convenience.
4607 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg;
4610 bool AllFieldsAreConst;
4612 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD,
4613 Sema::CXXSpecialMember CSM, bool Diagnose)
4614 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose),
4615 IsConstructor(false), IsAssignment(false), IsMove(false),
4616 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()),
4617 AllFieldsAreConst(true) {
4619 case Sema::CXXDefaultConstructor:
4620 case Sema::CXXCopyConstructor:
4621 IsConstructor = true;
4623 case Sema::CXXMoveConstructor:
4624 IsConstructor = true;
4627 case Sema::CXXCopyAssignment:
4628 IsAssignment = true;
4630 case Sema::CXXMoveAssignment:
4631 IsAssignment = true;
4634 case Sema::CXXDestructor:
4636 case Sema::CXXInvalid:
4637 llvm_unreachable("invalid special member kind");
4640 if (MD->getNumParams()) {
4641 ConstArg = MD->getParamDecl(0)->getType().isConstQualified();
4642 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified();
4646 bool inUnion() const { return MD->getParent()->isUnion(); }
4648 /// Look up the corresponding special member in the given class.
4649 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class,
4651 unsigned TQ = MD->getTypeQualifiers();
4652 // cv-qualifiers on class members don't affect default ctor / dtor calls.
4653 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor)
4655 return S.LookupSpecialMember(Class, CSM,
4656 ConstArg || (Quals & Qualifiers::Const),
4657 VolatileArg || (Quals & Qualifiers::Volatile),
4658 MD->getRefQualifier() == RQ_RValue,
4659 TQ & Qualifiers::Const,
4660 TQ & Qualifiers::Volatile);
4663 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject;
4665 bool shouldDeleteForBase(CXXBaseSpecifier *Base);
4666 bool shouldDeleteForField(FieldDecl *FD);
4667 bool shouldDeleteForAllConstMembers();
4669 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj,
4671 bool shouldDeleteForSubobjectCall(Subobject Subobj,
4672 Sema::SpecialMemberOverloadResult *SMOR,
4673 bool IsDtorCallInCtor);
4675 bool isAccessible(Subobject Subobj, CXXMethodDecl *D);
4679 /// Is the given special member inaccessible when used on the given
4681 bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj,
4682 CXXMethodDecl *target) {
4683 /// If we're operating on a base class, the object type is the
4684 /// type of this special member.
4686 AccessSpecifier access = target->getAccess();
4687 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) {
4688 objectTy = S.Context.getTypeDeclType(MD->getParent());
4689 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access);
4691 // If we're operating on a field, the object type is the type of the field.
4693 objectTy = S.Context.getTypeDeclType(target->getParent());
4696 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy);
4699 /// Check whether we should delete a special member due to the implicit
4700 /// definition containing a call to a special member of a subobject.
4701 bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall(
4702 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR,
4703 bool IsDtorCallInCtor) {
4704 CXXMethodDecl *Decl = SMOR->getMethod();
4705 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
4709 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)
4710 DiagKind = !Decl ? 0 : 1;
4711 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
4713 else if (!isAccessible(Subobj, Decl))
4715 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() &&
4716 !Decl->isTrivial()) {
4717 // A member of a union must have a trivial corresponding special member.
4718 // As a weird special case, a destructor call from a union's constructor
4719 // must be accessible and non-deleted, but need not be trivial. Such a
4720 // destructor is never actually called, but is semantically checked as
4730 S.Diag(Field->getLocation(),
4731 diag::note_deleted_special_member_class_subobject)
4732 << CSM << MD->getParent() << /*IsField*/true
4733 << Field << DiagKind << IsDtorCallInCtor;
4735 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>();
4736 S.Diag(Base->getLocStart(),
4737 diag::note_deleted_special_member_class_subobject)
4738 << CSM << MD->getParent() << /*IsField*/false
4739 << Base->getType() << DiagKind << IsDtorCallInCtor;
4743 S.NoteDeletedFunction(Decl);
4744 // FIXME: Explain inaccessibility if DiagKind == 3.
4750 /// Check whether we should delete a special member function due to having a
4751 /// direct or virtual base class or non-static data member of class type M.
4752 bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject(
4753 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) {
4754 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
4756 // C++11 [class.ctor]p5:
4757 // -- any direct or virtual base class, or non-static data member with no
4758 // brace-or-equal-initializer, has class type M (or array thereof) and
4759 // either M has no default constructor or overload resolution as applied
4760 // to M's default constructor results in an ambiguity or in a function
4761 // that is deleted or inaccessible
4762 // C++11 [class.copy]p11, C++11 [class.copy]p23:
4763 // -- a direct or virtual base class B that cannot be copied/moved because
4764 // overload resolution, as applied to B's corresponding special member,
4765 // results in an ambiguity or a function that is deleted or inaccessible
4766 // from the defaulted special member
4767 // C++11 [class.dtor]p5:
4768 // -- any direct or virtual base class [...] has a type with a destructor
4769 // that is deleted or inaccessible
4770 if (!(CSM == Sema::CXXDefaultConstructor &&
4771 Field && Field->hasInClassInitializer()) &&
4772 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false))
4775 // C++11 [class.ctor]p5, C++11 [class.copy]p11:
4776 // -- any direct or virtual base class or non-static data member has a
4777 // type with a destructor that is deleted or inaccessible
4778 if (IsConstructor) {
4779 Sema::SpecialMemberOverloadResult *SMOR =
4780 S.LookupSpecialMember(Class, Sema::CXXDestructor,
4781 false, false, false, false, false);
4782 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true))
4789 /// Check whether we should delete a special member function due to the class
4790 /// having a particular direct or virtual base class.
4791 bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) {
4792 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl();
4793 return shouldDeleteForClassSubobject(BaseClass, Base, 0);
4796 /// Check whether we should delete a special member function due to the class
4797 /// having a particular non-static data member.
4798 bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) {
4799 QualType FieldType = S.Context.getBaseElementType(FD->getType());
4800 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl();
4802 if (CSM == Sema::CXXDefaultConstructor) {
4803 // For a default constructor, all references must be initialized in-class
4804 // and, if a union, it must have a non-const member.
4805 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) {
4807 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
4808 << MD->getParent() << FD << FieldType << /*Reference*/0;
4811 // C++11 [class.ctor]p5: any non-variant non-static data member of
4812 // const-qualified type (or array thereof) with no
4813 // brace-or-equal-initializer does not have a user-provided default
4815 if (!inUnion() && FieldType.isConstQualified() &&
4816 !FD->hasInClassInitializer() &&
4817 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) {
4819 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
4820 << MD->getParent() << FD << FD->getType() << /*Const*/1;
4824 if (inUnion() && !FieldType.isConstQualified())
4825 AllFieldsAreConst = false;
4826 } else if (CSM == Sema::CXXCopyConstructor) {
4827 // For a copy constructor, data members must not be of rvalue reference
4829 if (FieldType->isRValueReferenceType()) {
4831 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference)
4832 << MD->getParent() << FD << FieldType;
4835 } else if (IsAssignment) {
4836 // For an assignment operator, data members must not be of reference type.
4837 if (FieldType->isReferenceType()) {
4839 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
4840 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0;
4843 if (!FieldRecord && FieldType.isConstQualified()) {
4844 // C++11 [class.copy]p23:
4845 // -- a non-static data member of const non-class type (or array thereof)
4847 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
4848 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1;
4854 // Some additional restrictions exist on the variant members.
4855 if (!inUnion() && FieldRecord->isUnion() &&
4856 FieldRecord->isAnonymousStructOrUnion()) {
4857 bool AllVariantFieldsAreConst = true;
4859 // FIXME: Handle anonymous unions declared within anonymous unions.
4860 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(),
4861 UE = FieldRecord->field_end();
4863 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType());
4865 if (!UnionFieldType.isConstQualified())
4866 AllVariantFieldsAreConst = false;
4868 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl();
4869 if (UnionFieldRecord &&
4870 shouldDeleteForClassSubobject(UnionFieldRecord, *UI,
4871 UnionFieldType.getCVRQualifiers()))
4875 // At least one member in each anonymous union must be non-const
4876 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst &&
4877 FieldRecord->field_begin() != FieldRecord->field_end()) {
4879 S.Diag(FieldRecord->getLocation(),
4880 diag::note_deleted_default_ctor_all_const)
4881 << MD->getParent() << /*anonymous union*/1;
4885 // Don't check the implicit member of the anonymous union type.
4886 // This is technically non-conformant, but sanity demands it.
4890 if (shouldDeleteForClassSubobject(FieldRecord, FD,
4891 FieldType.getCVRQualifiers()))
4898 /// C++11 [class.ctor] p5:
4899 /// A defaulted default constructor for a class X is defined as deleted if
4900 /// X is a union and all of its variant members are of const-qualified type.
4901 bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() {
4902 // This is a silly definition, because it gives an empty union a deleted
4903 // default constructor. Don't do that.
4904 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst &&
4905 (MD->getParent()->field_begin() != MD->getParent()->field_end())) {
4907 S.Diag(MD->getParent()->getLocation(),
4908 diag::note_deleted_default_ctor_all_const)
4909 << MD->getParent() << /*not anonymous union*/0;
4915 /// Determine whether a defaulted special member function should be defined as
4916 /// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11,
4917 /// C++11 [class.copy]p23, and C++11 [class.dtor]p5.
4918 bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM,
4920 if (MD->isInvalidDecl())
4922 CXXRecordDecl *RD = MD->getParent();
4923 assert(!RD->isDependentType() && "do deletion after instantiation");
4924 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl())
4927 // C++11 [expr.lambda.prim]p19:
4928 // The closure type associated with a lambda-expression has a
4929 // deleted (8.4.3) default constructor and a deleted copy
4930 // assignment operator.
4931 if (RD->isLambda() &&
4932 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) {
4934 Diag(RD->getLocation(), diag::note_lambda_decl);
4938 // For an anonymous struct or union, the copy and assignment special members
4939 // will never be used, so skip the check. For an anonymous union declared at
4940 // namespace scope, the constructor and destructor are used.
4941 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor &&
4942 RD->isAnonymousStructOrUnion())
4945 // C++11 [class.copy]p7, p18:
4946 // If the class definition declares a move constructor or move assignment
4947 // operator, an implicitly declared copy constructor or copy assignment
4948 // operator is defined as deleted.
4949 if (MD->isImplicit() &&
4950 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) {
4951 CXXMethodDecl *UserDeclaredMove = 0;
4953 // In Microsoft mode, a user-declared move only causes the deletion of the
4954 // corresponding copy operation, not both copy operations.
4955 if (RD->hasUserDeclaredMoveConstructor() &&
4956 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) {
4957 if (!Diagnose) return true;
4959 // Find any user-declared move constructor.
4960 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(),
4961 E = RD->ctor_end(); I != E; ++I) {
4962 if (I->isMoveConstructor()) {
4963 UserDeclaredMove = *I;
4967 assert(UserDeclaredMove);
4968 } else if (RD->hasUserDeclaredMoveAssignment() &&
4969 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) {
4970 if (!Diagnose) return true;
4972 // Find any user-declared move assignment operator.
4973 for (CXXRecordDecl::method_iterator I = RD->method_begin(),
4974 E = RD->method_end(); I != E; ++I) {
4975 if (I->isMoveAssignmentOperator()) {
4976 UserDeclaredMove = *I;
4980 assert(UserDeclaredMove);
4983 if (UserDeclaredMove) {
4984 Diag(UserDeclaredMove->getLocation(),
4985 diag::note_deleted_copy_user_declared_move)
4986 << (CSM == CXXCopyAssignment) << RD
4987 << UserDeclaredMove->isMoveAssignmentOperator();
4992 // Do access control from the special member function
4993 ContextRAII MethodContext(*this, MD);
4995 // C++11 [class.dtor]p5:
4996 // -- for a virtual destructor, lookup of the non-array deallocation function
4997 // results in an ambiguity or in a function that is deleted or inaccessible
4998 if (CSM == CXXDestructor && MD->isVirtual()) {
4999 FunctionDecl *OperatorDelete = 0;
5000 DeclarationName Name =
5001 Context.DeclarationNames.getCXXOperatorName(OO_Delete);
5002 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name,
5003 OperatorDelete, false)) {
5005 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete);
5010 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose);
5012 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(),
5013 BE = RD->bases_end(); BI != BE; ++BI)
5014 if (!BI->isVirtual() &&
5015 SMI.shouldDeleteForBase(BI))
5018 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(),
5019 BE = RD->vbases_end(); BI != BE; ++BI)
5020 if (SMI.shouldDeleteForBase(BI))
5023 for (CXXRecordDecl::field_iterator FI = RD->field_begin(),
5024 FE = RD->field_end(); FI != FE; ++FI)
5025 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() &&
5026 SMI.shouldDeleteForField(*FI))
5029 if (SMI.shouldDeleteForAllConstMembers())
5035 /// Perform lookup for a special member of the specified kind, and determine
5036 /// whether it is trivial. If the triviality can be determined without the
5037 /// lookup, skip it. This is intended for use when determining whether a
5038 /// special member of a containing object is trivial, and thus does not ever
5039 /// perform overload resolution for default constructors.
5041 /// If \p Selected is not \c NULL, \c *Selected will be filled in with the
5042 /// member that was most likely to be intended to be trivial, if any.
5043 static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD,
5044 Sema::CXXSpecialMember CSM, unsigned Quals,
5045 CXXMethodDecl **Selected) {
5050 case Sema::CXXInvalid:
5051 llvm_unreachable("not a special member");
5053 case Sema::CXXDefaultConstructor:
5054 // C++11 [class.ctor]p5:
5055 // A default constructor is trivial if:
5056 // - all the [direct subobjects] have trivial default constructors
5058 // Note, no overload resolution is performed in this case.
5059 if (RD->hasTrivialDefaultConstructor())
5063 // If there's a default constructor which could have been trivial, dig it
5064 // out. Otherwise, if there's any user-provided default constructor, point
5065 // to that as an example of why there's not a trivial one.
5066 CXXConstructorDecl *DefCtor = 0;
5067 if (RD->needsImplicitDefaultConstructor())
5068 S.DeclareImplicitDefaultConstructor(RD);
5069 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(),
5070 CE = RD->ctor_end(); CI != CE; ++CI) {
5071 if (!CI->isDefaultConstructor())
5074 if (!DefCtor->isUserProvided())
5078 *Selected = DefCtor;
5083 case Sema::CXXDestructor:
5084 // C++11 [class.dtor]p5:
5085 // A destructor is trivial if:
5086 // - all the direct [subobjects] have trivial destructors
5087 if (RD->hasTrivialDestructor())
5091 if (RD->needsImplicitDestructor())
5092 S.DeclareImplicitDestructor(RD);
5093 *Selected = RD->getDestructor();
5098 case Sema::CXXCopyConstructor:
5099 // C++11 [class.copy]p12:
5100 // A copy constructor is trivial if:
5101 // - the constructor selected to copy each direct [subobject] is trivial
5102 if (RD->hasTrivialCopyConstructor()) {
5103 if (Quals == Qualifiers::Const)
5104 // We must either select the trivial copy constructor or reach an
5105 // ambiguity; no need to actually perform overload resolution.
5107 } else if (!Selected) {
5110 // In C++98, we are not supposed to perform overload resolution here, but we
5111 // treat that as a language defect, as suggested on cxx-abi-dev, to treat
5112 // cases like B as having a non-trivial copy constructor:
5113 // struct A { template<typename T> A(T&); };
5114 // struct B { mutable A a; };
5115 goto NeedOverloadResolution;
5117 case Sema::CXXCopyAssignment:
5118 // C++11 [class.copy]p25:
5119 // A copy assignment operator is trivial if:
5120 // - the assignment operator selected to copy each direct [subobject] is
5122 if (RD->hasTrivialCopyAssignment()) {
5123 if (Quals == Qualifiers::Const)
5125 } else if (!Selected) {
5128 // In C++98, we are not supposed to perform overload resolution here, but we
5129 // treat that as a language defect.
5130 goto NeedOverloadResolution;
5132 case Sema::CXXMoveConstructor:
5133 case Sema::CXXMoveAssignment:
5134 NeedOverloadResolution:
5135 Sema::SpecialMemberOverloadResult *SMOR =
5136 S.LookupSpecialMember(RD, CSM,
5137 Quals & Qualifiers::Const,
5138 Quals & Qualifiers::Volatile,
5139 /*RValueThis*/false, /*ConstThis*/false,
5140 /*VolatileThis*/false);
5142 // The standard doesn't describe how to behave if the lookup is ambiguous.
5143 // We treat it as not making the member non-trivial, just like the standard
5144 // mandates for the default constructor. This should rarely matter, because
5145 // the member will also be deleted.
5146 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
5149 if (!SMOR->getMethod()) {
5150 assert(SMOR->getKind() ==
5151 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted);
5155 // We deliberately don't check if we found a deleted special member. We're
5158 *Selected = SMOR->getMethod();
5159 return SMOR->getMethod()->isTrivial();
5162 llvm_unreachable("unknown special method kind");
5165 static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) {
5166 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end();
5168 if (!CI->isImplicit())
5171 // Look for constructor templates.
5172 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter;
5173 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) {
5174 if (CXXConstructorDecl *CD =
5175 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()))
5182 /// The kind of subobject we are checking for triviality. The values of this
5183 /// enumeration are used in diagnostics.
5184 enum TrivialSubobjectKind {
5185 /// The subobject is a base class.
5187 /// The subobject is a non-static data member.
5189 /// The object is actually the complete object.
5193 /// Check whether the special member selected for a given type would be trivial.
5194 static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc,
5196 Sema::CXXSpecialMember CSM,
5197 TrivialSubobjectKind Kind,
5199 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl();
5203 CXXMethodDecl *Selected;
5204 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(),
5205 Diagnose ? &Selected : 0))
5209 if (!Selected && CSM == Sema::CXXDefaultConstructor) {
5210 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor)
5211 << Kind << SubType.getUnqualifiedType();
5212 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD))
5213 S.Diag(CD->getLocation(), diag::note_user_declared_ctor);
5214 } else if (!Selected)
5215 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy)
5216 << Kind << SubType.getUnqualifiedType() << CSM << SubType;
5217 else if (Selected->isUserProvided()) {
5218 if (Kind == TSK_CompleteObject)
5219 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided)
5220 << Kind << SubType.getUnqualifiedType() << CSM;
5222 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided)
5223 << Kind << SubType.getUnqualifiedType() << CSM;
5224 S.Diag(Selected->getLocation(), diag::note_declared_at);
5227 if (Kind != TSK_CompleteObject)
5228 S.Diag(SubobjLoc, diag::note_nontrivial_subobject)
5229 << Kind << SubType.getUnqualifiedType() << CSM;
5231 // Explain why the defaulted or deleted special member isn't trivial.
5232 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose);
5239 /// Check whether the members of a class type allow a special member to be
5241 static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD,
5242 Sema::CXXSpecialMember CSM,
5243 bool ConstArg, bool Diagnose) {
5244 for (CXXRecordDecl::field_iterator FI = RD->field_begin(),
5245 FE = RD->field_end(); FI != FE; ++FI) {
5246 if (FI->isInvalidDecl() || FI->isUnnamedBitfield())
5249 QualType FieldType = S.Context.getBaseElementType(FI->getType());
5251 // Pretend anonymous struct or union members are members of this class.
5252 if (FI->isAnonymousStructOrUnion()) {
5253 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(),
5254 CSM, ConstArg, Diagnose))
5259 // C++11 [class.ctor]p5:
5260 // A default constructor is trivial if [...]
5261 // -- no non-static data member of its class has a
5262 // brace-or-equal-initializer
5263 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) {
5265 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI;
5269 // Objective C ARC 4.3.5:
5270 // [...] nontrivally ownership-qualified types are [...] not trivially
5271 // default constructible, copy constructible, move constructible, copy
5272 // assignable, move assignable, or destructible [...]
5273 if (S.getLangOpts().ObjCAutoRefCount &&
5274 FieldType.hasNonTrivialObjCLifetime()) {
5276 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership)
5277 << RD << FieldType.getObjCLifetime();
5281 if (ConstArg && !FI->isMutable())
5282 FieldType.addConst();
5283 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM,
5284 TSK_Field, Diagnose))
5291 /// Diagnose why the specified class does not have a trivial special member of
5293 void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) {
5294 QualType Ty = Context.getRecordType(RD);
5295 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)
5298 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM,
5299 TSK_CompleteObject, /*Diagnose*/true);
5302 /// Determine whether a defaulted or deleted special member function is trivial,
5303 /// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12,
5304 /// C++11 [class.copy]p25, and C++11 [class.dtor]p5.
5305 bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM,
5307 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough");
5309 CXXRecordDecl *RD = MD->getParent();
5311 bool ConstArg = false;
5313 // C++11 [class.copy]p12, p25:
5314 // A [special member] is trivial if its declared parameter type is the same
5315 // as if it had been implicitly declared [...]
5317 case CXXDefaultConstructor:
5319 // Trivial default constructors and destructors cannot have parameters.
5322 case CXXCopyConstructor:
5323 case CXXCopyAssignment: {
5324 // Trivial copy operations always have const, non-volatile parameter types.
5326 const ParmVarDecl *Param0 = MD->getParamDecl(0);
5327 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>();
5328 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) {
5330 Diag(Param0->getLocation(), diag::note_nontrivial_param_type)
5331 << Param0->getSourceRange() << Param0->getType()
5332 << Context.getLValueReferenceType(
5333 Context.getRecordType(RD).withConst());
5339 case CXXMoveConstructor:
5340 case CXXMoveAssignment: {
5341 // Trivial move operations always have non-cv-qualified parameters.
5342 const ParmVarDecl *Param0 = MD->getParamDecl(0);
5343 const RValueReferenceType *RT =
5344 Param0->getType()->getAs<RValueReferenceType>();
5345 if (!RT || RT->getPointeeType().getCVRQualifiers()) {
5347 Diag(Param0->getLocation(), diag::note_nontrivial_param_type)
5348 << Param0->getSourceRange() << Param0->getType()
5349 << Context.getRValueReferenceType(Context.getRecordType(RD));
5356 llvm_unreachable("not a special member");
5359 // FIXME: We require that the parameter-declaration-clause is equivalent to
5360 // that of an implicit declaration, not just that the declared parameter type
5361 // matches, in order to prevent absuridities like a function simultaneously
5362 // being a trivial copy constructor and a non-trivial default constructor.
5363 // This issue has not yet been assigned a core issue number.
5364 if (MD->getMinRequiredArguments() < MD->getNumParams()) {
5366 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(),
5367 diag::note_nontrivial_default_arg)
5368 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange();
5371 if (MD->isVariadic()) {
5373 Diag(MD->getLocation(), diag::note_nontrivial_variadic);
5377 // C++11 [class.ctor]p5, C++11 [class.dtor]p5:
5378 // A copy/move [constructor or assignment operator] is trivial if
5379 // -- the [member] selected to copy/move each direct base class subobject
5382 // C++11 [class.copy]p12, C++11 [class.copy]p25:
5383 // A [default constructor or destructor] is trivial if
5384 // -- all the direct base classes have trivial [default constructors or
5386 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(),
5387 BE = RD->bases_end(); BI != BE; ++BI)
5388 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(),
5389 ConstArg ? BI->getType().withConst()
5391 CSM, TSK_BaseClass, Diagnose))
5394 // C++11 [class.ctor]p5, C++11 [class.dtor]p5:
5395 // A copy/move [constructor or assignment operator] for a class X is
5397 // -- for each non-static data member of X that is of class type (or array
5398 // thereof), the constructor selected to copy/move that member is
5401 // C++11 [class.copy]p12, C++11 [class.copy]p25:
5402 // A [default constructor or destructor] is trivial if
5403 // -- for all of the non-static data members of its class that are of class
5404 // type (or array thereof), each such class has a trivial [default
5405 // constructor or destructor]
5406 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose))
5409 // C++11 [class.dtor]p5:
5410 // A destructor is trivial if [...]
5411 // -- the destructor is not virtual
5412 if (CSM == CXXDestructor && MD->isVirtual()) {
5414 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD;
5418 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25:
5419 // A [special member] for class X is trivial if [...]
5420 // -- class X has no virtual functions and no virtual base classes
5421 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) {
5425 if (RD->getNumVBases()) {
5426 // Check for virtual bases. We already know that the corresponding
5427 // member in all bases is trivial, so vbases must all be direct.
5428 CXXBaseSpecifier &BS = *RD->vbases_begin();
5429 assert(BS.isVirtual());
5430 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1;
5434 // Must have a virtual method.
5435 for (CXXRecordDecl::method_iterator MI = RD->method_begin(),
5436 ME = RD->method_end(); MI != ME; ++MI) {
5437 if (MI->isVirtual()) {
5438 SourceLocation MLoc = MI->getLocStart();
5439 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0;
5444 llvm_unreachable("dynamic class with no vbases and no virtual functions");
5447 // Looks like it's trivial!
5451 /// \brief Data used with FindHiddenVirtualMethod
5453 struct FindHiddenVirtualMethodData {
5455 CXXMethodDecl *Method;
5456 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods;
5457 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
5461 /// \brief Check whether any most overriden method from MD in Methods
5462 static bool CheckMostOverridenMethods(const CXXMethodDecl *MD,
5463 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) {
5464 if (MD->size_overridden_methods() == 0)
5465 return Methods.count(MD->getCanonicalDecl());
5466 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
5467 E = MD->end_overridden_methods();
5469 if (CheckMostOverridenMethods(*I, Methods))
5474 /// \brief Member lookup function that determines whether a given C++
5475 /// method overloads virtual methods in a base class without overriding any,
5476 /// to be used with CXXRecordDecl::lookupInBases().
5477 static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier,
5480 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
5482 FindHiddenVirtualMethodData &Data
5483 = *static_cast<FindHiddenVirtualMethodData*>(UserData);
5485 DeclarationName Name = Data.Method->getDeclName();
5486 assert(Name.getNameKind() == DeclarationName::Identifier);
5488 bool foundSameNameMethod = false;
5489 SmallVector<CXXMethodDecl *, 8> overloadedMethods;
5490 for (Path.Decls = BaseRecord->lookup(Name);
5491 !Path.Decls.empty();
5492 Path.Decls = Path.Decls.slice(1)) {
5493 NamedDecl *D = Path.Decls.front();
5494 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
5495 MD = MD->getCanonicalDecl();
5496 foundSameNameMethod = true;
5497 // Interested only in hidden virtual methods.
5498 if (!MD->isVirtual())
5500 // If the method we are checking overrides a method from its base
5501 // don't warn about the other overloaded methods.
5502 if (!Data.S->IsOverload(Data.Method, MD, false))
5504 // Collect the overload only if its hidden.
5505 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods))
5506 overloadedMethods.push_back(MD);
5510 if (foundSameNameMethod)
5511 Data.OverloadedMethods.append(overloadedMethods.begin(),
5512 overloadedMethods.end());
5513 return foundSameNameMethod;
5516 /// \brief Add the most overriden methods from MD to Methods
5517 static void AddMostOverridenMethods(const CXXMethodDecl *MD,
5518 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) {
5519 if (MD->size_overridden_methods() == 0)
5520 Methods.insert(MD->getCanonicalDecl());
5521 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
5522 E = MD->end_overridden_methods();
5524 AddMostOverridenMethods(*I, Methods);
5527 /// \brief See if a method overloads virtual methods in a base class without
5529 void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
5530 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual,
5531 MD->getLocation()) == DiagnosticsEngine::Ignored)
5533 if (!MD->getDeclName().isIdentifier())
5536 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases.
5537 /*bool RecordPaths=*/false,
5538 /*bool DetectVirtual=*/false);
5539 FindHiddenVirtualMethodData Data;
5543 // Keep the base methods that were overriden or introduced in the subclass
5544 // by 'using' in a set. A base method not in this set is hidden.
5545 DeclContext::lookup_result R = DC->lookup(MD->getDeclName());
5546 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) {
5548 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I))
5549 ND = shad->getTargetDecl();
5550 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
5551 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods);
5554 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) &&
5555 !Data.OverloadedMethods.empty()) {
5556 Diag(MD->getLocation(), diag::warn_overloaded_virtual)
5557 << MD << (Data.OverloadedMethods.size() > 1);
5559 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) {
5560 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i];
5561 PartialDiagnostic PD = PDiag(
5562 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD;
5563 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType());
5564 Diag(overloadedMD->getLocation(), PD);
5569 void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
5571 SourceLocation LBrac,
5572 SourceLocation RBrac,
5573 AttributeList *AttrList) {
5577 AdjustDeclIfTemplate(TagDecl);
5579 for (const AttributeList* l = AttrList; l; l = l->getNext()) {
5580 if (l->getKind() != AttributeList::AT_Visibility)
5583 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) <<
5587 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef(
5588 // strict aliasing violation!
5589 reinterpret_cast<Decl**>(FieldCollector->getCurFields()),
5590 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList);
5592 CheckCompletedCXXClass(
5593 dyn_cast_or_null<CXXRecordDecl>(TagDecl));
5596 /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
5597 /// special functions, such as the default constructor, copy
5598 /// constructor, or destructor, to the given C++ class (C++
5599 /// [special]p1). This routine can only be executed just before the
5600 /// definition of the class is complete.
5601 void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
5602 if (!ClassDecl->hasUserDeclaredConstructor())
5603 ++ASTContext::NumImplicitDefaultConstructors;
5605 if (!ClassDecl->hasUserDeclaredCopyConstructor()) {
5606 ++ASTContext::NumImplicitCopyConstructors;
5608 // If the properties or semantics of the copy constructor couldn't be
5609 // determined while the class was being declared, force a declaration
5611 if (ClassDecl->needsOverloadResolutionForCopyConstructor())
5612 DeclareImplicitCopyConstructor(ClassDecl);
5615 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) {
5616 ++ASTContext::NumImplicitMoveConstructors;
5618 if (ClassDecl->needsOverloadResolutionForMoveConstructor())
5619 DeclareImplicitMoveConstructor(ClassDecl);
5622 if (!ClassDecl->hasUserDeclaredCopyAssignment()) {
5623 ++ASTContext::NumImplicitCopyAssignmentOperators;
5625 // If we have a dynamic class, then the copy assignment operator may be
5626 // virtual, so we have to declare it immediately. This ensures that, e.g.,
5627 // it shows up in the right place in the vtable and that we diagnose
5628 // problems with the implicit exception specification.
5629 if (ClassDecl->isDynamicClass() ||
5630 ClassDecl->needsOverloadResolutionForCopyAssignment())
5631 DeclareImplicitCopyAssignment(ClassDecl);
5634 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) {
5635 ++ASTContext::NumImplicitMoveAssignmentOperators;
5637 // Likewise for the move assignment operator.
5638 if (ClassDecl->isDynamicClass() ||
5639 ClassDecl->needsOverloadResolutionForMoveAssignment())
5640 DeclareImplicitMoveAssignment(ClassDecl);
5643 if (!ClassDecl->hasUserDeclaredDestructor()) {
5644 ++ASTContext::NumImplicitDestructors;
5646 // If we have a dynamic class, then the destructor may be virtual, so we
5647 // have to declare the destructor immediately. This ensures that, e.g., it
5648 // shows up in the right place in the vtable and that we diagnose problems
5649 // with the implicit exception specification.
5650 if (ClassDecl->isDynamicClass() ||
5651 ClassDecl->needsOverloadResolutionForDestructor())
5652 DeclareImplicitDestructor(ClassDecl);
5656 void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) {
5660 int NumParamList = D->getNumTemplateParameterLists();
5661 for (int i = 0; i < NumParamList; i++) {
5662 TemplateParameterList* Params = D->getTemplateParameterList(i);
5663 for (TemplateParameterList::iterator Param = Params->begin(),
5664 ParamEnd = Params->end();
5665 Param != ParamEnd; ++Param) {
5666 NamedDecl *Named = cast<NamedDecl>(*Param);
5667 if (Named->getDeclName()) {
5669 IdResolver.AddDecl(Named);
5675 void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) {
5679 TemplateParameterList *Params = 0;
5680 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D))
5681 Params = Template->getTemplateParameters();
5682 else if (ClassTemplatePartialSpecializationDecl *PartialSpec
5683 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
5684 Params = PartialSpec->getTemplateParameters();
5688 for (TemplateParameterList::iterator Param = Params->begin(),
5689 ParamEnd = Params->end();
5690 Param != ParamEnd; ++Param) {
5691 NamedDecl *Named = cast<NamedDecl>(*Param);
5692 if (Named->getDeclName()) {
5694 IdResolver.AddDecl(Named);
5699 void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
5700 if (!RecordD) return;
5701 AdjustDeclIfTemplate(RecordD);
5702 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD);
5703 PushDeclContext(S, Record);
5706 void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
5707 if (!RecordD) return;
5711 /// ActOnStartDelayedCXXMethodDeclaration - We have completed
5712 /// parsing a top-level (non-nested) C++ class, and we are now
5713 /// parsing those parts of the given Method declaration that could
5714 /// not be parsed earlier (C++ [class.mem]p2), such as default
5715 /// arguments. This action should enter the scope of the given
5716 /// Method declaration as if we had just parsed the qualified method
5717 /// name. However, it should not bring the parameters into scope;
5718 /// that will be performed by ActOnDelayedCXXMethodParameter.
5719 void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
5722 /// ActOnDelayedCXXMethodParameter - We've already started a delayed
5723 /// C++ method declaration. We're (re-)introducing the given
5724 /// function parameter into scope for use in parsing later parts of
5725 /// the method declaration. For example, we could see an
5726 /// ActOnParamDefaultArgument event for this parameter.
5727 void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) {
5731 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD);
5733 // If this parameter has an unparsed default argument, clear it out
5734 // to make way for the parsed default argument.
5735 if (Param->hasUnparsedDefaultArg())
5736 Param->setDefaultArg(0);
5739 if (Param->getDeclName())
5740 IdResolver.AddDecl(Param);
5743 /// ActOnFinishDelayedCXXMethodDeclaration - We have finished
5744 /// processing the delayed method declaration for Method. The method
5745 /// declaration is now considered finished. There may be a separate
5746 /// ActOnStartOfFunctionDef action later (not necessarily
5747 /// immediately!) for this method, if it was also defined inside the
5749 void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
5753 AdjustDeclIfTemplate(MethodD);
5755 FunctionDecl *Method = cast<FunctionDecl>(MethodD);
5757 // Now that we have our default arguments, check the constructor
5758 // again. It could produce additional diagnostics or affect whether
5759 // the class has implicitly-declared destructors, among other
5761 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method))
5762 CheckConstructor(Constructor);
5764 // Check the default arguments, which we may have added.
5765 if (!Method->isInvalidDecl())
5766 CheckCXXDefaultArguments(Method);
5769 /// CheckConstructorDeclarator - Called by ActOnDeclarator to check
5770 /// the well-formedness of the constructor declarator @p D with type @p
5771 /// R. If there are any errors in the declarator, this routine will
5772 /// emit diagnostics and set the invalid bit to true. In any case, the type
5773 /// will be updated to reflect a well-formed type for the constructor and
5775 QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R,
5777 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
5779 // C++ [class.ctor]p3:
5780 // A constructor shall not be virtual (10.3) or static (9.4). A
5781 // constructor can be invoked for a const, volatile or const
5782 // volatile object. A constructor shall not be declared const,
5783 // volatile, or const volatile (9.3.2).
5785 if (!D.isInvalidType())
5786 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
5787 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc())
5788 << SourceRange(D.getIdentifierLoc());
5791 if (SC == SC_Static) {
5792 if (!D.isInvalidType())
5793 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
5794 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
5795 << SourceRange(D.getIdentifierLoc());
5800 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
5801 if (FTI.TypeQuals != 0) {
5802 if (FTI.TypeQuals & Qualifiers::Const)
5803 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
5804 << "const" << SourceRange(D.getIdentifierLoc());
5805 if (FTI.TypeQuals & Qualifiers::Volatile)
5806 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
5807 << "volatile" << SourceRange(D.getIdentifierLoc());
5808 if (FTI.TypeQuals & Qualifiers::Restrict)
5809 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
5810 << "restrict" << SourceRange(D.getIdentifierLoc());
5814 // C++0x [class.ctor]p4:
5815 // A constructor shall not be declared with a ref-qualifier.
5816 if (FTI.hasRefQualifier()) {
5817 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor)
5818 << FTI.RefQualifierIsLValueRef
5819 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
5823 // Rebuild the function type "R" without any type qualifiers (in
5824 // case any of the errors above fired) and with "void" as the
5825 // return type, since constructors don't have return types.
5826 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
5827 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType())
5830 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
5832 EPI.RefQualifier = RQ_None;
5834 return Context.getFunctionType(Context.VoidTy, Proto->getArgTypes(), EPI);
5837 /// CheckConstructor - Checks a fully-formed constructor for
5838 /// well-formedness, issuing any diagnostics required. Returns true if
5839 /// the constructor declarator is invalid.
5840 void Sema::CheckConstructor(CXXConstructorDecl *Constructor) {
5841 CXXRecordDecl *ClassDecl
5842 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext());
5844 return Constructor->setInvalidDecl();
5846 // C++ [class.copy]p3:
5847 // A declaration of a constructor for a class X is ill-formed if
5848 // its first parameter is of type (optionally cv-qualified) X and
5849 // either there are no other parameters or else all other
5850 // parameters have default arguments.
5851 if (!Constructor->isInvalidDecl() &&
5852 ((Constructor->getNumParams() == 1) ||
5853 (Constructor->getNumParams() > 1 &&
5854 Constructor->getParamDecl(1)->hasDefaultArg())) &&
5855 Constructor->getTemplateSpecializationKind()
5856 != TSK_ImplicitInstantiation) {
5857 QualType ParamType = Constructor->getParamDecl(0)->getType();
5858 QualType ClassTy = Context.getTagDeclType(ClassDecl);
5859 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) {
5860 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation();
5861 const char *ConstRef
5862 = Constructor->getParamDecl(0)->getIdentifier() ? "const &"
5864 Diag(ParamLoc, diag::err_constructor_byvalue_arg)
5865 << FixItHint::CreateInsertion(ParamLoc, ConstRef);
5867 // FIXME: Rather that making the constructor invalid, we should endeavor
5869 Constructor->setInvalidDecl();
5874 /// CheckDestructor - Checks a fully-formed destructor definition for
5875 /// well-formedness, issuing any diagnostics required. Returns true
5877 bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) {
5878 CXXRecordDecl *RD = Destructor->getParent();
5880 if (Destructor->isVirtual()) {
5883 if (!Destructor->isImplicit())
5884 Loc = Destructor->getLocation();
5886 Loc = RD->getLocation();
5888 // If we have a virtual destructor, look up the deallocation function
5889 FunctionDecl *OperatorDelete = 0;
5890 DeclarationName Name =
5891 Context.DeclarationNames.getCXXOperatorName(OO_Delete);
5892 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete))
5895 MarkFunctionReferenced(Loc, OperatorDelete);
5897 Destructor->setOperatorDelete(OperatorDelete);
5904 FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) {
5905 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
5906 FTI.ArgInfo[0].Param &&
5907 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType());
5910 /// CheckDestructorDeclarator - Called by ActOnDeclarator to check
5911 /// the well-formednes of the destructor declarator @p D with type @p
5912 /// R. If there are any errors in the declarator, this routine will
5913 /// emit diagnostics and set the declarator to invalid. Even if this happens,
5914 /// will be updated to reflect a well-formed type for the destructor and
5916 QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R,
5918 // C++ [class.dtor]p1:
5919 // [...] A typedef-name that names a class is a class-name
5920 // (7.1.3); however, a typedef-name that names a class shall not
5921 // be used as the identifier in the declarator for a destructor
5923 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName);
5924 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>())
5925 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
5926 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl());
5927 else if (const TemplateSpecializationType *TST =
5928 DeclaratorType->getAs<TemplateSpecializationType>())
5929 if (TST->isTypeAlias())
5930 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
5931 << DeclaratorType << 1;
5933 // C++ [class.dtor]p2:
5934 // A destructor is used to destroy objects of its class type. A
5935 // destructor takes no parameters, and no return type can be
5936 // specified for it (not even void). The address of a destructor
5937 // shall not be taken. A destructor shall not be static. A
5938 // destructor can be invoked for a const, volatile or const
5939 // volatile object. A destructor shall not be declared const,
5940 // volatile or const volatile (9.3.2).
5941 if (SC == SC_Static) {
5942 if (!D.isInvalidType())
5943 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be)
5944 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
5945 << SourceRange(D.getIdentifierLoc())
5946 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
5950 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
5951 // Destructors don't have return types, but the parser will
5952 // happily parse something like:
5958 // The return type will be eliminated later.
5959 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type)
5960 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
5961 << SourceRange(D.getIdentifierLoc());
5964 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
5965 if (FTI.TypeQuals != 0 && !D.isInvalidType()) {
5966 if (FTI.TypeQuals & Qualifiers::Const)
5967 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
5968 << "const" << SourceRange(D.getIdentifierLoc());
5969 if (FTI.TypeQuals & Qualifiers::Volatile)
5970 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
5971 << "volatile" << SourceRange(D.getIdentifierLoc());
5972 if (FTI.TypeQuals & Qualifiers::Restrict)
5973 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
5974 << "restrict" << SourceRange(D.getIdentifierLoc());
5978 // C++0x [class.dtor]p2:
5979 // A destructor shall not be declared with a ref-qualifier.
5980 if (FTI.hasRefQualifier()) {
5981 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor)
5982 << FTI.RefQualifierIsLValueRef
5983 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
5987 // Make sure we don't have any parameters.
5988 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) {
5989 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params);
5991 // Delete the parameters.
5996 // Make sure the destructor isn't variadic.
5997 if (FTI.isVariadic) {
5998 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic);
6002 // Rebuild the function type "R" without any type qualifiers or
6003 // parameters (in case any of the errors above fired) and with
6004 // "void" as the return type, since destructors don't have return
6006 if (!D.isInvalidType())
6009 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
6010 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
6011 EPI.Variadic = false;
6013 EPI.RefQualifier = RQ_None;
6014 return Context.getFunctionType(Context.VoidTy, None, EPI);
6017 /// CheckConversionDeclarator - Called by ActOnDeclarator to check the
6018 /// well-formednes of the conversion function declarator @p D with
6019 /// type @p R. If there are any errors in the declarator, this routine
6020 /// will emit diagnostics and return true. Otherwise, it will return
6021 /// false. Either way, the type @p R will be updated to reflect a
6022 /// well-formed type for the conversion operator.
6023 void Sema::CheckConversionDeclarator(Declarator &D, QualType &R,
6025 // C++ [class.conv.fct]p1:
6026 // Neither parameter types nor return type can be specified. The
6027 // type of a conversion function (8.3.5) is "function taking no
6028 // parameter returning conversion-type-id."
6029 if (SC == SC_Static) {
6030 if (!D.isInvalidType())
6031 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member)
6032 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
6033 << SourceRange(D.getIdentifierLoc());
6038 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId);
6040 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
6041 // Conversion functions don't have return types, but the parser will
6042 // happily parse something like:
6045 // float operator bool();
6048 // The return type will be changed later anyway.
6049 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type)
6050 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
6051 << SourceRange(D.getIdentifierLoc());
6055 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
6057 // Make sure we don't have any parameters.
6058 if (Proto->getNumArgs() > 0) {
6059 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params);
6061 // Delete the parameters.
6062 D.getFunctionTypeInfo().freeArgs();
6064 } else if (Proto->isVariadic()) {
6065 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic);
6069 // Diagnose "&operator bool()" and other such nonsense. This
6070 // is actually a gcc extension which we don't support.
6071 if (Proto->getResultType() != ConvType) {
6072 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl)
6073 << Proto->getResultType();
6075 ConvType = Proto->getResultType();
6078 // C++ [class.conv.fct]p4:
6079 // The conversion-type-id shall not represent a function type nor
6081 if (ConvType->isArrayType()) {
6082 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array);
6083 ConvType = Context.getPointerType(ConvType);
6085 } else if (ConvType->isFunctionType()) {
6086 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function);
6087 ConvType = Context.getPointerType(ConvType);
6091 // Rebuild the function type "R" without any parameters (in case any
6092 // of the errors above fired) and with the conversion type as the
6094 if (D.isInvalidType())
6095 R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo());
6097 // C++0x explicit conversion operators.
6098 if (D.getDeclSpec().isExplicitSpecified())
6099 Diag(D.getDeclSpec().getExplicitSpecLoc(),
6100 getLangOpts().CPlusPlus11 ?
6101 diag::warn_cxx98_compat_explicit_conversion_functions :
6102 diag::ext_explicit_conversion_functions)
6103 << SourceRange(D.getDeclSpec().getExplicitSpecLoc());
6106 /// ActOnConversionDeclarator - Called by ActOnDeclarator to complete
6107 /// the declaration of the given C++ conversion function. This routine
6108 /// is responsible for recording the conversion function in the C++
6109 /// class, if possible.
6110 Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) {
6111 assert(Conversion && "Expected to receive a conversion function declaration");
6113 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext());
6115 // Make sure we aren't redeclaring the conversion function.
6116 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType());
6118 // C++ [class.conv.fct]p1:
6119 // [...] A conversion function is never used to convert a
6120 // (possibly cv-qualified) object to the (possibly cv-qualified)
6121 // same object type (or a reference to it), to a (possibly
6122 // cv-qualified) base class of that type (or a reference to it),
6123 // or to (possibly cv-qualified) void.
6124 // FIXME: Suppress this warning if the conversion function ends up being a
6125 // virtual function that overrides a virtual function in a base class.
6127 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
6128 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>())
6129 ConvType = ConvTypeRef->getPointeeType();
6130 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared &&
6131 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization)
6132 /* Suppress diagnostics for instantiations. */;
6133 else if (ConvType->isRecordType()) {
6134 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType();
6135 if (ConvType == ClassType)
6136 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used)
6138 else if (IsDerivedFrom(ClassType, ConvType))
6139 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used)
6140 << ClassType << ConvType;
6141 } else if (ConvType->isVoidType()) {
6142 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used)
6143 << ClassType << ConvType;
6146 if (FunctionTemplateDecl *ConversionTemplate
6147 = Conversion->getDescribedFunctionTemplate())
6148 return ConversionTemplate;
6153 //===----------------------------------------------------------------------===//
6154 // Namespace Handling
6155 //===----------------------------------------------------------------------===//
6157 /// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is
6159 static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc,
6161 IdentifierInfo *II, bool *IsInline,
6162 NamespaceDecl *PrevNS) {
6163 assert(*IsInline != PrevNS->isInline());
6165 // HACK: Work around a bug in libstdc++4.6's <atomic>, where
6166 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as
6167 // inline namespaces, with the intention of bringing names into namespace std.
6169 // We support this just well enough to get that case working; this is not
6170 // sufficient to support reopening namespaces as inline in general.
6171 if (*IsInline && II && II->getName().startswith("__atomic") &&
6172 S.getSourceManager().isInSystemHeader(Loc)) {
6173 // Mark all prior declarations of the namespace as inline.
6174 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS;
6175 NS = NS->getPreviousDecl())
6176 NS->setInline(*IsInline);
6177 // Patch up the lookup table for the containing namespace. This isn't really
6178 // correct, but it's good enough for this particular case.
6179 for (DeclContext::decl_iterator I = PrevNS->decls_begin(),
6180 E = PrevNS->decls_end(); I != E; ++I)
6181 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I))
6182 PrevNS->getParent()->makeDeclVisibleInContext(ND);
6186 if (PrevNS->isInline())
6187 // The user probably just forgot the 'inline', so suggest that it
6189 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline)
6190 << FixItHint::CreateInsertion(KeywordLoc, "inline ");
6192 S.Diag(Loc, diag::err_inline_namespace_mismatch)
6195 S.Diag(PrevNS->getLocation(), diag::note_previous_definition);
6196 *IsInline = PrevNS->isInline();
6199 /// ActOnStartNamespaceDef - This is called at the start of a namespace
6201 Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope,
6202 SourceLocation InlineLoc,
6203 SourceLocation NamespaceLoc,
6204 SourceLocation IdentLoc,
6206 SourceLocation LBrace,
6207 AttributeList *AttrList) {
6208 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc;
6209 // For anonymous namespace, take the location of the left brace.
6210 SourceLocation Loc = II ? IdentLoc : LBrace;
6211 bool IsInline = InlineLoc.isValid();
6212 bool IsInvalid = false;
6214 bool AddToKnown = false;
6215 Scope *DeclRegionScope = NamespcScope->getParent();
6217 NamespaceDecl *PrevNS = 0;
6219 // C++ [namespace.def]p2:
6220 // The identifier in an original-namespace-definition shall not
6221 // have been previously defined in the declarative region in
6222 // which the original-namespace-definition appears. The
6223 // identifier in an original-namespace-definition is the name of
6224 // the namespace. Subsequently in that declarative region, it is
6225 // treated as an original-namespace-name.
6227 // Since namespace names are unique in their scope, and we don't
6228 // look through using directives, just look for any ordinary names.
6230 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member |
6231 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag |
6232 Decl::IDNS_Namespace;
6233 NamedDecl *PrevDecl = 0;
6234 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II);
6235 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E;
6237 if ((*I)->getIdentifierNamespace() & IDNS) {
6243 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl);
6246 // This is an extended namespace definition.
6247 if (IsInline != PrevNS->isInline())
6248 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II,
6250 } else if (PrevDecl) {
6251 // This is an invalid name redefinition.
6252 Diag(Loc, diag::err_redefinition_different_kind)
6254 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
6256 // Continue on to push Namespc as current DeclContext and return it.
6257 } else if (II->isStr("std") &&
6258 CurContext->getRedeclContext()->isTranslationUnit()) {
6259 // This is the first "real" definition of the namespace "std", so update
6260 // our cache of the "std" namespace to point at this definition.
6261 PrevNS = getStdNamespace();
6263 AddToKnown = !IsInline;
6265 // We've seen this namespace for the first time.
6266 AddToKnown = !IsInline;
6269 // Anonymous namespaces.
6271 // Determine whether the parent already has an anonymous namespace.
6272 DeclContext *Parent = CurContext->getRedeclContext();
6273 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
6274 PrevNS = TU->getAnonymousNamespace();
6276 NamespaceDecl *ND = cast<NamespaceDecl>(Parent);
6277 PrevNS = ND->getAnonymousNamespace();
6280 if (PrevNS && IsInline != PrevNS->isInline())
6281 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II,
6285 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline,
6286 StartLoc, Loc, II, PrevNS);
6288 Namespc->setInvalidDecl();
6290 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList);
6292 // FIXME: Should we be merging attributes?
6293 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>())
6294 PushNamespaceVisibilityAttr(Attr, Loc);
6297 StdNamespace = Namespc;
6299 KnownNamespaces[Namespc] = false;
6302 PushOnScopeChains(Namespc, DeclRegionScope);
6304 // Link the anonymous namespace into its parent.
6305 DeclContext *Parent = CurContext->getRedeclContext();
6306 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
6307 TU->setAnonymousNamespace(Namespc);
6309 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc);
6312 CurContext->addDecl(Namespc);
6314 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition
6315 // behaves as if it were replaced by
6316 // namespace unique { /* empty body */ }
6317 // using namespace unique;
6318 // namespace unique { namespace-body }
6319 // where all occurrences of 'unique' in a translation unit are
6320 // replaced by the same identifier and this identifier differs
6321 // from all other identifiers in the entire program.
6323 // We just create the namespace with an empty name and then add an
6324 // implicit using declaration, just like the standard suggests.
6326 // CodeGen enforces the "universally unique" aspect by giving all
6327 // declarations semantically contained within an anonymous
6328 // namespace internal linkage.
6331 UsingDirectiveDecl* UD
6332 = UsingDirectiveDecl::Create(Context, Parent,
6333 /* 'using' */ LBrace,
6334 /* 'namespace' */ SourceLocation(),
6335 /* qualifier */ NestedNameSpecifierLoc(),
6336 /* identifier */ SourceLocation(),
6338 /* Ancestor */ Parent);
6340 Parent->addDecl(UD);
6344 ActOnDocumentableDecl(Namespc);
6346 // Although we could have an invalid decl (i.e. the namespace name is a
6347 // redefinition), push it as current DeclContext and try to continue parsing.
6348 // FIXME: We should be able to push Namespc here, so that the each DeclContext
6349 // for the namespace has the declarations that showed up in that particular
6350 // namespace definition.
6351 PushDeclContext(NamespcScope, Namespc);
6355 /// getNamespaceDecl - Returns the namespace a decl represents. If the decl
6356 /// is a namespace alias, returns the namespace it points to.
6357 static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) {
6358 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D))
6359 return AD->getNamespace();
6360 return dyn_cast_or_null<NamespaceDecl>(D);
6363 /// ActOnFinishNamespaceDef - This callback is called after a namespace is
6364 /// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef.
6365 void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) {
6366 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl);
6367 assert(Namespc && "Invalid parameter, expected NamespaceDecl");
6368 Namespc->setRBraceLoc(RBrace);
6370 if (Namespc->hasAttr<VisibilityAttr>())
6371 PopPragmaVisibility(true, RBrace);
6374 CXXRecordDecl *Sema::getStdBadAlloc() const {
6375 return cast_or_null<CXXRecordDecl>(
6376 StdBadAlloc.get(Context.getExternalSource()));
6379 NamespaceDecl *Sema::getStdNamespace() const {
6380 return cast_or_null<NamespaceDecl>(
6381 StdNamespace.get(Context.getExternalSource()));
6384 /// \brief Retrieve the special "std" namespace, which may require us to
6385 /// implicitly define the namespace.
6386 NamespaceDecl *Sema::getOrCreateStdNamespace() {
6387 if (!StdNamespace) {
6388 // The "std" namespace has not yet been defined, so build one implicitly.
6389 StdNamespace = NamespaceDecl::Create(Context,
6390 Context.getTranslationUnitDecl(),
6392 SourceLocation(), SourceLocation(),
6393 &PP.getIdentifierTable().get("std"),
6395 getStdNamespace()->setImplicit(true);
6398 return getStdNamespace();
6401 bool Sema::isStdInitializerList(QualType Ty, QualType *Element) {
6402 assert(getLangOpts().CPlusPlus &&
6403 "Looking for std::initializer_list outside of C++.");
6405 // We're looking for implicit instantiations of
6406 // template <typename E> class std::initializer_list.
6408 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it.
6411 ClassTemplateDecl *Template = 0;
6412 const TemplateArgument *Arguments = 0;
6414 if (const RecordType *RT = Ty->getAs<RecordType>()) {
6416 ClassTemplateSpecializationDecl *Specialization =
6417 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl());
6418 if (!Specialization)
6421 Template = Specialization->getSpecializedTemplate();
6422 Arguments = Specialization->getTemplateArgs().data();
6423 } else if (const TemplateSpecializationType *TST =
6424 Ty->getAs<TemplateSpecializationType>()) {
6425 Template = dyn_cast_or_null<ClassTemplateDecl>(
6426 TST->getTemplateName().getAsTemplateDecl());
6427 Arguments = TST->getArgs();
6432 if (!StdInitializerList) {
6433 // Haven't recognized std::initializer_list yet, maybe this is it.
6434 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl();
6435 if (TemplateClass->getIdentifier() !=
6436 &PP.getIdentifierTable().get("initializer_list") ||
6437 !getStdNamespace()->InEnclosingNamespaceSetOf(
6438 TemplateClass->getDeclContext()))
6440 // This is a template called std::initializer_list, but is it the right
6442 TemplateParameterList *Params = Template->getTemplateParameters();
6443 if (Params->getMinRequiredArguments() != 1)
6445 if (!isa<TemplateTypeParmDecl>(Params->getParam(0)))
6448 // It's the right template.
6449 StdInitializerList = Template;
6452 if (Template != StdInitializerList)
6455 // This is an instance of std::initializer_list. Find the argument type.
6457 *Element = Arguments[0].getAsType();
6461 static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){
6462 NamespaceDecl *Std = S.getStdNamespace();
6464 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
6468 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"),
6469 Loc, Sema::LookupOrdinaryName);
6470 if (!S.LookupQualifiedName(Result, Std)) {
6471 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
6474 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>();
6476 Result.suppressDiagnostics();
6477 // We found something weird. Complain about the first thing we found.
6478 NamedDecl *Found = *Result.begin();
6479 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list);
6483 // We found some template called std::initializer_list. Now verify that it's
6485 TemplateParameterList *Params = Template->getTemplateParameters();
6486 if (Params->getMinRequiredArguments() != 1 ||
6487 !isa<TemplateTypeParmDecl>(Params->getParam(0))) {
6488 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list);
6495 QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) {
6496 if (!StdInitializerList) {
6497 StdInitializerList = LookupStdInitializerList(*this, Loc);
6498 if (!StdInitializerList)
6502 TemplateArgumentListInfo Args(Loc, Loc);
6503 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element),
6504 Context.getTrivialTypeSourceInfo(Element,
6506 return Context.getCanonicalType(
6507 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args));
6510 bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) {
6511 // C++ [dcl.init.list]p2:
6512 // A constructor is an initializer-list constructor if its first parameter
6513 // is of type std::initializer_list<E> or reference to possibly cv-qualified
6514 // std::initializer_list<E> for some type E, and either there are no other
6515 // parameters or else all other parameters have default arguments.
6516 if (Ctor->getNumParams() < 1 ||
6517 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg()))
6520 QualType ArgType = Ctor->getParamDecl(0)->getType();
6521 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>())
6522 ArgType = RT->getPointeeType().getUnqualifiedType();
6524 return isStdInitializerList(ArgType, 0);
6527 /// \brief Determine whether a using statement is in a context where it will be
6528 /// apply in all contexts.
6529 static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) {
6530 switch (CurContext->getDeclKind()) {
6531 case Decl::TranslationUnit:
6533 case Decl::LinkageSpec:
6534 return IsUsingDirectiveInToplevelContext(CurContext->getParent());
6542 // Callback to only accept typo corrections that are namespaces.
6543 class NamespaceValidatorCCC : public CorrectionCandidateCallback {
6545 virtual bool ValidateCandidate(const TypoCorrection &candidate) {
6546 if (NamedDecl *ND = candidate.getCorrectionDecl()) {
6547 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND);
6555 static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc,
6557 SourceLocation IdentLoc,
6558 IdentifierInfo *Ident) {
6559 NamespaceValidatorCCC Validator;
6561 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(),
6562 R.getLookupKind(), Sc, &SS,
6564 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts()));
6565 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts()));
6566 if (DeclContext *DC = S.computeDeclContext(SS, false))
6567 S.Diag(IdentLoc, diag::err_using_directive_member_suggest)
6568 << Ident << DC << CorrectedQuotedStr << SS.getRange()
6569 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(),
6572 S.Diag(IdentLoc, diag::err_using_directive_suggest)
6573 << Ident << CorrectedQuotedStr
6574 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr);
6576 S.Diag(Corrected.getCorrectionDecl()->getLocation(),
6577 diag::note_namespace_defined_here) << CorrectedQuotedStr;
6579 R.addDecl(Corrected.getCorrectionDecl());
6585 Decl *Sema::ActOnUsingDirective(Scope *S,
6586 SourceLocation UsingLoc,
6587 SourceLocation NamespcLoc,
6589 SourceLocation IdentLoc,
6590 IdentifierInfo *NamespcName,
6591 AttributeList *AttrList) {
6592 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
6593 assert(NamespcName && "Invalid NamespcName.");
6594 assert(IdentLoc.isValid() && "Invalid NamespceName location.");
6596 // This can only happen along a recovery path.
6597 while (S->getFlags() & Scope::TemplateParamScope)
6599 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
6601 UsingDirectiveDecl *UDir = 0;
6602 NestedNameSpecifier *Qualifier = 0;
6604 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
6606 // Lookup namespace name.
6607 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName);
6608 LookupParsedName(R, S, &SS);
6609 if (R.isAmbiguous())
6614 // Allow "using namespace std;" or "using namespace ::std;" even if
6615 // "std" hasn't been defined yet, for GCC compatibility.
6616 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) &&
6617 NamespcName->isStr("std")) {
6618 Diag(IdentLoc, diag::ext_using_undefined_std);
6619 R.addDecl(getOrCreateStdNamespace());
6622 // Otherwise, attempt typo correction.
6623 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName);
6627 NamedDecl *Named = R.getFoundDecl();
6628 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named))
6629 && "expected namespace decl");
6630 // C++ [namespace.udir]p1:
6631 // A using-directive specifies that the names in the nominated
6632 // namespace can be used in the scope in which the
6633 // using-directive appears after the using-directive. During
6634 // unqualified name lookup (3.4.1), the names appear as if they
6635 // were declared in the nearest enclosing namespace which
6636 // contains both the using-directive and the nominated
6637 // namespace. [Note: in this context, "contains" means "contains
6638 // directly or indirectly". ]
6640 // Find enclosing context containing both using-directive and
6641 // nominated namespace.
6642 NamespaceDecl *NS = getNamespaceDecl(Named);
6643 DeclContext *CommonAncestor = cast<DeclContext>(NS);
6644 while (CommonAncestor && !CommonAncestor->Encloses(CurContext))
6645 CommonAncestor = CommonAncestor->getParent();
6647 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc,
6648 SS.getWithLocInContext(Context),
6649 IdentLoc, Named, CommonAncestor);
6651 if (IsUsingDirectiveInToplevelContext(CurContext) &&
6652 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) {
6653 Diag(IdentLoc, diag::warn_using_directive_in_header);
6656 PushUsingDirective(S, UDir);
6658 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
6662 ProcessDeclAttributeList(S, UDir, AttrList);
6667 void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) {
6668 // If the scope has an associated entity and the using directive is at
6669 // namespace or translation unit scope, add the UsingDirectiveDecl into
6670 // its lookup structure so qualified name lookup can find it.
6671 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity());
6672 if (Ctx && !Ctx->isFunctionOrMethod())
6675 // Otherwise, it is at block sope. The using-directives will affect lookup
6676 // only to the end of the scope.
6677 S->PushUsingDirective(UDir);
6681 Decl *Sema::ActOnUsingDeclaration(Scope *S,
6683 bool HasUsingKeyword,
6684 SourceLocation UsingLoc,
6686 UnqualifiedId &Name,
6687 AttributeList *AttrList,
6689 SourceLocation TypenameLoc) {
6690 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
6692 switch (Name.getKind()) {
6693 case UnqualifiedId::IK_ImplicitSelfParam:
6694 case UnqualifiedId::IK_Identifier:
6695 case UnqualifiedId::IK_OperatorFunctionId:
6696 case UnqualifiedId::IK_LiteralOperatorId:
6697 case UnqualifiedId::IK_ConversionFunctionId:
6700 case UnqualifiedId::IK_ConstructorName:
6701 case UnqualifiedId::IK_ConstructorTemplateId:
6702 // C++11 inheriting constructors.
6703 Diag(Name.getLocStart(),
6704 getLangOpts().CPlusPlus11 ?
6705 diag::warn_cxx98_compat_using_decl_constructor :
6706 diag::err_using_decl_constructor)
6709 if (getLangOpts().CPlusPlus11) break;
6713 case UnqualifiedId::IK_DestructorName:
6714 Diag(Name.getLocStart(), diag::err_using_decl_destructor)
6718 case UnqualifiedId::IK_TemplateId:
6719 Diag(Name.getLocStart(), diag::err_using_decl_template_id)
6720 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc);
6724 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name);
6725 DeclarationName TargetName = TargetNameInfo.getName();
6729 // Warn about access declarations.
6730 // TODO: store that the declaration was written without 'using' and
6731 // talk about access decls instead of using decls in the
6733 if (!HasUsingKeyword) {
6734 UsingLoc = Name.getLocStart();
6736 Diag(UsingLoc, diag::warn_access_decl_deprecated)
6737 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using ");
6740 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) ||
6741 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration))
6744 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS,
6745 TargetNameInfo, AttrList,
6746 /* IsInstantiation */ false,
6747 IsTypeName, TypenameLoc);
6749 PushOnScopeChains(UD, S, /*AddToContext*/ false);
6754 /// \brief Determine whether a using declaration considers the given
6755 /// declarations as "equivalent", e.g., if they are redeclarations of
6756 /// the same entity or are both typedefs of the same type.
6758 IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2,
6759 bool &SuppressRedeclaration) {
6760 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) {
6761 SuppressRedeclaration = false;
6765 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1))
6766 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) {
6767 SuppressRedeclaration = true;
6768 return Context.hasSameType(TD1->getUnderlyingType(),
6769 TD2->getUnderlyingType());
6776 /// Determines whether to create a using shadow decl for a particular
6777 /// decl, given the set of decls existing prior to this using lookup.
6778 bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig,
6779 const LookupResult &Previous) {
6780 // Diagnose finding a decl which is not from a base class of the
6781 // current class. We do this now because there are cases where this
6782 // function will silently decide not to build a shadow decl, which
6783 // will pre-empt further diagnostics.
6785 // We don't need to do this in C++0x because we do the check once on
6788 // FIXME: diagnose the following if we care enough:
6789 // struct A { int foo; };
6790 // struct B : A { using A::foo; };
6791 // template <class T> struct C : A {};
6792 // template <class T> struct D : C<T> { using B::foo; } // <---
6793 // This is invalid (during instantiation) in C++03 because B::foo
6794 // resolves to the using decl in B, which is not a base class of D<T>.
6795 // We can't diagnose it immediately because C<T> is an unknown
6796 // specialization. The UsingShadowDecl in D<T> then points directly
6797 // to A::foo, which will look well-formed when we instantiate.
6798 // The right solution is to not collapse the shadow-decl chain.
6799 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) {
6800 DeclContext *OrigDC = Orig->getDeclContext();
6802 // Handle enums and anonymous structs.
6803 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent();
6804 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC);
6805 while (OrigRec->isAnonymousStructOrUnion())
6806 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext());
6808 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) {
6809 if (OrigDC == CurContext) {
6810 Diag(Using->getLocation(),
6811 diag::err_using_decl_nested_name_specifier_is_current_class)
6812 << Using->getQualifierLoc().getSourceRange();
6813 Diag(Orig->getLocation(), diag::note_using_decl_target);
6817 Diag(Using->getQualifierLoc().getBeginLoc(),
6818 diag::err_using_decl_nested_name_specifier_is_not_base_class)
6819 << Using->getQualifier()
6820 << cast<CXXRecordDecl>(CurContext)
6821 << Using->getQualifierLoc().getSourceRange();
6822 Diag(Orig->getLocation(), diag::note_using_decl_target);
6827 if (Previous.empty()) return false;
6829 NamedDecl *Target = Orig;
6830 if (isa<UsingShadowDecl>(Target))
6831 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
6833 // If the target happens to be one of the previous declarations, we
6834 // don't have a conflict.
6836 // FIXME: but we might be increasing its access, in which case we
6837 // should redeclare it.
6838 NamedDecl *NonTag = 0, *Tag = 0;
6839 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
6841 NamedDecl *D = (*I)->getUnderlyingDecl();
6843 if (IsEquivalentForUsingDecl(Context, D, Target, Result))
6846 (isa<TagDecl>(D) ? Tag : NonTag) = D;
6849 if (Target->isFunctionOrFunctionTemplate()) {
6851 if (isa<FunctionTemplateDecl>(Target))
6852 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl();
6854 FD = cast<FunctionDecl>(Target);
6856 NamedDecl *OldDecl = 0;
6857 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) {
6861 case Ovl_NonFunction:
6862 Diag(Using->getLocation(), diag::err_using_decl_conflict);
6865 // We found a decl with the exact signature.
6867 // If we're in a record, we want to hide the target, so we
6868 // return true (without a diagnostic) to tell the caller not to
6869 // build a shadow decl.
6870 if (CurContext->isRecord())
6873 // If we're not in a record, this is an error.
6874 Diag(Using->getLocation(), diag::err_using_decl_conflict);
6878 Diag(Target->getLocation(), diag::note_using_decl_target);
6879 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict);
6883 // Target is not a function.
6885 if (isa<TagDecl>(Target)) {
6886 // No conflict between a tag and a non-tag.
6887 if (!Tag) return false;
6889 Diag(Using->getLocation(), diag::err_using_decl_conflict);
6890 Diag(Target->getLocation(), diag::note_using_decl_target);
6891 Diag(Tag->getLocation(), diag::note_using_decl_conflict);
6895 // No conflict between a tag and a non-tag.
6896 if (!NonTag) return false;
6898 Diag(Using->getLocation(), diag::err_using_decl_conflict);
6899 Diag(Target->getLocation(), diag::note_using_decl_target);
6900 Diag(NonTag->getLocation(), diag::note_using_decl_conflict);
6904 /// Builds a shadow declaration corresponding to a 'using' declaration.
6905 UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S,
6909 // If we resolved to another shadow declaration, just coalesce them.
6910 NamedDecl *Target = Orig;
6911 if (isa<UsingShadowDecl>(Target)) {
6912 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
6913 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration");
6916 UsingShadowDecl *Shadow
6917 = UsingShadowDecl::Create(Context, CurContext,
6918 UD->getLocation(), UD, Target);
6919 UD->addShadowDecl(Shadow);
6921 Shadow->setAccess(UD->getAccess());
6922 if (Orig->isInvalidDecl() || UD->isInvalidDecl())
6923 Shadow->setInvalidDecl();
6926 PushOnScopeChains(Shadow, S);
6928 CurContext->addDecl(Shadow);
6934 /// Hides a using shadow declaration. This is required by the current
6935 /// using-decl implementation when a resolvable using declaration in a
6936 /// class is followed by a declaration which would hide or override
6937 /// one or more of the using decl's targets; for example:
6939 /// struct Base { void foo(int); };
6940 /// struct Derived : Base {
6941 /// using Base::foo;
6945 /// The governing language is C++03 [namespace.udecl]p12:
6947 /// When a using-declaration brings names from a base class into a
6948 /// derived class scope, member functions in the derived class
6949 /// override and/or hide member functions with the same name and
6950 /// parameter types in a base class (rather than conflicting).
6952 /// There are two ways to implement this:
6953 /// (1) optimistically create shadow decls when they're not hidden
6954 /// by existing declarations, or
6955 /// (2) don't create any shadow decls (or at least don't make them
6956 /// visible) until we've fully parsed/instantiated the class.
6957 /// The problem with (1) is that we might have to retroactively remove
6958 /// a shadow decl, which requires several O(n) operations because the
6959 /// decl structures are (very reasonably) not designed for removal.
6960 /// (2) avoids this but is very fiddly and phase-dependent.
6961 void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) {
6962 if (Shadow->getDeclName().getNameKind() ==
6963 DeclarationName::CXXConversionFunctionName)
6964 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow);
6966 // Remove it from the DeclContext...
6967 Shadow->getDeclContext()->removeDecl(Shadow);
6969 // ...and the scope, if applicable...
6971 S->RemoveDecl(Shadow);
6972 IdResolver.RemoveDecl(Shadow);
6975 // ...and the using decl.
6976 Shadow->getUsingDecl()->removeShadowDecl(Shadow);
6978 // TODO: complain somehow if Shadow was used. It shouldn't
6979 // be possible for this to happen, because...?
6982 /// Builds a using declaration.
6984 /// \param IsInstantiation - Whether this call arises from an
6985 /// instantiation of an unresolved using declaration. We treat
6986 /// the lookup differently for these declarations.
6987 NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
6988 SourceLocation UsingLoc,
6990 const DeclarationNameInfo &NameInfo,
6991 AttributeList *AttrList,
6992 bool IsInstantiation,
6994 SourceLocation TypenameLoc) {
6995 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
6996 SourceLocation IdentLoc = NameInfo.getLoc();
6997 assert(IdentLoc.isValid() && "Invalid TargetName location.");
6999 // FIXME: We ignore attributes for now.
7002 Diag(IdentLoc, diag::err_using_requires_qualname);
7006 // Do the redeclaration lookup in the current scope.
7007 LookupResult Previous(*this, NameInfo, LookupUsingDeclName,
7009 Previous.setHideTags(false);
7011 LookupName(Previous, S);
7013 // It is really dumb that we have to do this.
7014 LookupResult::Filter F = Previous.makeFilter();
7015 while (F.hasNext()) {
7016 NamedDecl *D = F.next();
7017 if (!isDeclInScope(D, CurContext, S))
7022 assert(IsInstantiation && "no scope in non-instantiation");
7023 assert(CurContext->isRecord() && "scope not record in instantiation");
7024 LookupQualifiedName(Previous, CurContext);
7027 // Check for invalid redeclarations.
7028 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous))
7031 // Check for bad qualifiers.
7032 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc))
7035 DeclContext *LookupContext = computeDeclContext(SS);
7037 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
7038 if (!LookupContext) {
7040 // FIXME: not all declaration name kinds are legal here
7041 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext,
7042 UsingLoc, TypenameLoc,
7044 IdentLoc, NameInfo.getName());
7046 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc,
7047 QualifierLoc, NameInfo);
7050 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc,
7051 NameInfo, IsTypeName);
7054 CurContext->addDecl(D);
7056 if (!LookupContext) return D;
7057 UsingDecl *UD = cast<UsingDecl>(D);
7059 if (RequireCompleteDeclContext(SS, LookupContext)) {
7060 UD->setInvalidDecl();
7064 // The normal rules do not apply to inheriting constructor declarations.
7065 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) {
7066 if (CheckInheritingConstructorUsingDecl(UD))
7067 UD->setInvalidDecl();
7071 // Otherwise, look up the target name.
7073 LookupResult R(*this, NameInfo, LookupOrdinaryName);
7075 // Unlike most lookups, we don't always want to hide tag
7076 // declarations: tag names are visible through the using declaration
7077 // even if hidden by ordinary names, *except* in a dependent context
7078 // where it's important for the sanity of two-phase lookup.
7079 if (!IsInstantiation)
7080 R.setHideTags(false);
7082 // For the purposes of this lookup, we have a base object type
7083 // equal to that of the current context.
7084 if (CurContext->isRecord()) {
7085 R.setBaseObjectType(
7086 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)));
7089 LookupQualifiedName(R, LookupContext);
7092 Diag(IdentLoc, diag::err_no_member)
7093 << NameInfo.getName() << LookupContext << SS.getRange();
7094 UD->setInvalidDecl();
7098 if (R.isAmbiguous()) {
7099 UD->setInvalidDecl();
7104 // If we asked for a typename and got a non-type decl, error out.
7105 if (!R.getAsSingle<TypeDecl>()) {
7106 Diag(IdentLoc, diag::err_using_typename_non_type);
7107 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
7108 Diag((*I)->getUnderlyingDecl()->getLocation(),
7109 diag::note_using_decl_target);
7110 UD->setInvalidDecl();
7114 // If we asked for a non-typename and we got a type, error out,
7115 // but only if this is an instantiation of an unresolved using
7116 // decl. Otherwise just silently find the type name.
7117 if (IsInstantiation && R.getAsSingle<TypeDecl>()) {
7118 Diag(IdentLoc, diag::err_using_dependent_value_is_type);
7119 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target);
7120 UD->setInvalidDecl();
7125 // C++0x N2914 [namespace.udecl]p6:
7126 // A using-declaration shall not name a namespace.
7127 if (R.getAsSingle<NamespaceDecl>()) {
7128 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace)
7130 UD->setInvalidDecl();
7134 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
7135 if (!CheckUsingShadowDecl(UD, *I, Previous))
7136 BuildUsingShadowDecl(S, UD, *I);
7142 /// Additional checks for a using declaration referring to a constructor name.
7143 bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) {
7144 assert(!UD->isTypeName() && "expecting a constructor name");
7146 const Type *SourceType = UD->getQualifier()->getAsType();
7147 assert(SourceType &&
7148 "Using decl naming constructor doesn't have type in scope spec.");
7149 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext);
7151 // Check whether the named type is a direct base class.
7152 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified();
7153 CXXRecordDecl::base_class_iterator BaseIt, BaseE;
7154 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end();
7155 BaseIt != BaseE; ++BaseIt) {
7156 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified();
7157 if (CanonicalSourceType == BaseType)
7159 if (BaseIt->getType()->isDependentType())
7163 if (BaseIt == BaseE) {
7164 // Did not find SourceType in the bases.
7165 Diag(UD->getUsingLocation(),
7166 diag::err_using_decl_constructor_not_in_direct_base)
7167 << UD->getNameInfo().getSourceRange()
7168 << QualType(SourceType, 0) << TargetClass;
7172 if (!CurContext->isDependentContext())
7173 BaseIt->setInheritConstructors();
7178 /// Checks that the given using declaration is not an invalid
7179 /// redeclaration. Note that this is checking only for the using decl
7180 /// itself, not for any ill-formedness among the UsingShadowDecls.
7181 bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
7183 const CXXScopeSpec &SS,
7184 SourceLocation NameLoc,
7185 const LookupResult &Prev) {
7186 // C++03 [namespace.udecl]p8:
7187 // C++0x [namespace.udecl]p10:
7188 // A using-declaration is a declaration and can therefore be used
7189 // repeatedly where (and only where) multiple declarations are
7192 // That's in non-member contexts.
7193 if (!CurContext->getRedeclContext()->isRecord())
7196 NestedNameSpecifier *Qual
7197 = static_cast<NestedNameSpecifier*>(SS.getScopeRep());
7199 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) {
7203 NestedNameSpecifier *DQual;
7204 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) {
7205 DTypename = UD->isTypeName();
7206 DQual = UD->getQualifier();
7207 } else if (UnresolvedUsingValueDecl *UD
7208 = dyn_cast<UnresolvedUsingValueDecl>(D)) {
7210 DQual = UD->getQualifier();
7211 } else if (UnresolvedUsingTypenameDecl *UD
7212 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
7214 DQual = UD->getQualifier();
7217 // using decls differ if one says 'typename' and the other doesn't.
7218 // FIXME: non-dependent using decls?
7219 if (isTypeName != DTypename) continue;
7221 // using decls differ if they name different scopes (but note that
7222 // template instantiation can cause this check to trigger when it
7223 // didn't before instantiation).
7224 if (Context.getCanonicalNestedNameSpecifier(Qual) !=
7225 Context.getCanonicalNestedNameSpecifier(DQual))
7228 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange();
7229 Diag(D->getLocation(), diag::note_using_decl) << 1;
7237 /// Checks that the given nested-name qualifier used in a using decl
7238 /// in the current context is appropriately related to the current
7239 /// scope. If an error is found, diagnoses it and returns true.
7240 bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc,
7241 const CXXScopeSpec &SS,
7242 SourceLocation NameLoc) {
7243 DeclContext *NamedContext = computeDeclContext(SS);
7245 if (!CurContext->isRecord()) {
7246 // C++03 [namespace.udecl]p3:
7247 // C++0x [namespace.udecl]p8:
7248 // A using-declaration for a class member shall be a member-declaration.
7250 // If we weren't able to compute a valid scope, it must be a
7251 // dependent class scope.
7252 if (!NamedContext || NamedContext->isRecord()) {
7253 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member)
7258 // Otherwise, everything is known to be fine.
7262 // The current scope is a record.
7264 // If the named context is dependent, we can't decide much.
7265 if (!NamedContext) {
7266 // FIXME: in C++0x, we can diagnose if we can prove that the
7267 // nested-name-specifier does not refer to a base class, which is
7268 // still possible in some cases.
7270 // Otherwise we have to conservatively report that things might be
7275 if (!NamedContext->isRecord()) {
7276 // Ideally this would point at the last name in the specifier,
7277 // but we don't have that level of source info.
7278 Diag(SS.getRange().getBegin(),
7279 diag::err_using_decl_nested_name_specifier_is_not_class)
7280 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange();
7284 if (!NamedContext->isDependentContext() &&
7285 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext))
7288 if (getLangOpts().CPlusPlus11) {
7289 // C++0x [namespace.udecl]p3:
7290 // In a using-declaration used as a member-declaration, the
7291 // nested-name-specifier shall name a base class of the class
7294 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(
7295 cast<CXXRecordDecl>(NamedContext))) {
7296 if (CurContext == NamedContext) {
7298 diag::err_using_decl_nested_name_specifier_is_current_class)
7303 Diag(SS.getRange().getBegin(),
7304 diag::err_using_decl_nested_name_specifier_is_not_base_class)
7305 << (NestedNameSpecifier*) SS.getScopeRep()
7306 << cast<CXXRecordDecl>(CurContext)
7314 // C++03 [namespace.udecl]p4:
7315 // A using-declaration used as a member-declaration shall refer
7316 // to a member of a base class of the class being defined [etc.].
7318 // Salient point: SS doesn't have to name a base class as long as
7319 // lookup only finds members from base classes. Therefore we can
7320 // diagnose here only if we can prove that that can't happen,
7321 // i.e. if the class hierarchies provably don't intersect.
7323 // TODO: it would be nice if "definitely valid" results were cached
7324 // in the UsingDecl and UsingShadowDecl so that these checks didn't
7325 // need to be repeated.
7328 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases;
7330 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) {
7331 UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
7332 Data->Bases.insert(Base);
7336 bool hasDependentBases(const CXXRecordDecl *Class) {
7337 return !Class->forallBases(collect, this);
7340 /// Returns true if the base is dependent or is one of the
7341 /// accumulated base classes.
7342 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) {
7343 UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
7344 return !Data->Bases.count(Base);
7347 bool mightShareBases(const CXXRecordDecl *Class) {
7348 return Bases.count(Class) || !Class->forallBases(doesNotContain, this);
7354 // Returns false if we find a dependent base.
7355 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext)))
7358 // Returns false if the class has a dependent base or if it or one
7359 // of its bases is present in the base set of the current context.
7360 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext)))
7363 Diag(SS.getRange().getBegin(),
7364 diag::err_using_decl_nested_name_specifier_is_not_base_class)
7365 << (NestedNameSpecifier*) SS.getScopeRep()
7366 << cast<CXXRecordDecl>(CurContext)
7372 Decl *Sema::ActOnAliasDeclaration(Scope *S,
7374 MultiTemplateParamsArg TemplateParamLists,
7375 SourceLocation UsingLoc,
7376 UnqualifiedId &Name,
7377 AttributeList *AttrList,
7379 // Skip up to the relevant declaration scope.
7380 while (S->getFlags() & Scope::TemplateParamScope)
7382 assert((S->getFlags() & Scope::DeclScope) &&
7383 "got alias-declaration outside of declaration scope");
7385 if (Type.isInvalid())
7388 bool Invalid = false;
7389 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name);
7390 TypeSourceInfo *TInfo = 0;
7391 GetTypeFromParser(Type.get(), &TInfo);
7393 if (DiagnoseClassNameShadow(CurContext, NameInfo))
7396 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo,
7397 UPPC_DeclarationType)) {
7399 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
7400 TInfo->getTypeLoc().getBeginLoc());
7403 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration);
7404 LookupName(Previous, S);
7406 // Warn about shadowing the name of a template parameter.
7407 if (Previous.isSingleResult() &&
7408 Previous.getFoundDecl()->isTemplateParameter()) {
7409 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl());
7413 assert(Name.Kind == UnqualifiedId::IK_Identifier &&
7414 "name in alias declaration must be an identifier");
7415 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc,
7417 Name.Identifier, TInfo);
7419 NewTD->setAccess(AS);
7422 NewTD->setInvalidDecl();
7424 ProcessDeclAttributeList(S, NewTD, AttrList);
7426 CheckTypedefForVariablyModifiedType(S, NewTD);
7427 Invalid |= NewTD->isInvalidDecl();
7429 bool Redeclaration = false;
7432 if (TemplateParamLists.size()) {
7433 TypeAliasTemplateDecl *OldDecl = 0;
7434 TemplateParameterList *OldTemplateParams = 0;
7436 if (TemplateParamLists.size() != 1) {
7437 Diag(UsingLoc, diag::err_alias_template_extra_headers)
7438 << SourceRange(TemplateParamLists[1]->getTemplateLoc(),
7439 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc());
7441 TemplateParameterList *TemplateParams = TemplateParamLists[0];
7443 // Only consider previous declarations in the same scope.
7444 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false,
7445 /*ExplicitInstantiationOrSpecialization*/false);
7446 if (!Previous.empty()) {
7447 Redeclaration = true;
7449 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>();
7450 if (!OldDecl && !Invalid) {
7451 Diag(UsingLoc, diag::err_redefinition_different_kind)
7454 NamedDecl *OldD = Previous.getRepresentativeDecl();
7455 if (OldD->getLocation().isValid())
7456 Diag(OldD->getLocation(), diag::note_previous_definition);
7461 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) {
7462 if (TemplateParameterListsAreEqual(TemplateParams,
7463 OldDecl->getTemplateParameters(),
7466 OldTemplateParams = OldDecl->getTemplateParameters();
7470 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl();
7472 !Context.hasSameType(OldTD->getUnderlyingType(),
7473 NewTD->getUnderlyingType())) {
7474 // FIXME: The C++0x standard does not clearly say this is ill-formed,
7475 // but we can't reasonably accept it.
7476 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef)
7477 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType();
7478 if (OldTD->getLocation().isValid())
7479 Diag(OldTD->getLocation(), diag::note_previous_definition);
7485 // Merge any previous default template arguments into our parameters,
7486 // and check the parameter list.
7487 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams,
7488 TPC_TypeAliasTemplate))
7491 TypeAliasTemplateDecl *NewDecl =
7492 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc,
7493 Name.Identifier, TemplateParams,
7496 NewDecl->setAccess(AS);
7499 NewDecl->setInvalidDecl();
7501 NewDecl->setPreviousDeclaration(OldDecl);
7505 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration);
7510 PushOnScopeChains(NewND, S);
7512 ActOnDocumentableDecl(NewND);
7516 Decl *Sema::ActOnNamespaceAliasDef(Scope *S,
7517 SourceLocation NamespaceLoc,
7518 SourceLocation AliasLoc,
7519 IdentifierInfo *Alias,
7521 SourceLocation IdentLoc,
7522 IdentifierInfo *Ident) {
7524 // Lookup the namespace name.
7525 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName);
7526 LookupParsedName(R, S, &SS);
7528 // Check if we have a previous declaration with the same name.
7530 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName,
7532 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S))
7536 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) {
7537 // We already have an alias with the same name that points to the same
7538 // namespace, so don't create a new one.
7539 // FIXME: At some point, we'll want to create the (redundant)
7540 // declaration to maintain better source information.
7541 if (!R.isAmbiguous() && !R.empty() &&
7542 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl())))
7546 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition :
7547 diag::err_redefinition_different_kind;
7548 Diag(AliasLoc, DiagID) << Alias;
7549 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
7553 if (R.isAmbiguous())
7557 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) {
7558 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
7563 NamespaceAliasDecl *AliasDecl =
7564 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc,
7565 Alias, SS.getWithLocInContext(Context),
7566 IdentLoc, R.getFoundDecl());
7568 PushOnScopeChains(AliasDecl, S);
7572 Sema::ImplicitExceptionSpecification
7573 Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc,
7574 CXXMethodDecl *MD) {
7575 CXXRecordDecl *ClassDecl = MD->getParent();
7577 // C++ [except.spec]p14:
7578 // An implicitly declared special member function (Clause 12) shall have an
7579 // exception-specification. [...]
7580 ImplicitExceptionSpecification ExceptSpec(*this);
7581 if (ClassDecl->isInvalidDecl())
7584 // Direct base-class constructors.
7585 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
7586 BEnd = ClassDecl->bases_end();
7588 if (B->isVirtual()) // Handled below.
7591 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
7592 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
7593 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
7594 // If this is a deleted function, add it anyway. This might be conformant
7595 // with the standard. This might not. I'm not sure. It might not matter.
7597 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
7601 // Virtual base-class constructors.
7602 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
7603 BEnd = ClassDecl->vbases_end();
7605 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
7606 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
7607 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
7608 // If this is a deleted function, add it anyway. This might be conformant
7609 // with the standard. This might not. I'm not sure. It might not matter.
7611 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
7615 // Field constructors.
7616 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
7617 FEnd = ClassDecl->field_end();
7619 if (F->hasInClassInitializer()) {
7620 if (Expr *E = F->getInClassInitializer())
7621 ExceptSpec.CalledExpr(E);
7622 else if (!F->isInvalidDecl())
7624 // If the brace-or-equal-initializer of a non-static data member
7625 // invokes a defaulted default constructor of its class or of an
7626 // enclosing class in a potentially evaluated subexpression, the
7627 // program is ill-formed.
7629 // This resolution is unworkable: the exception specification of the
7630 // default constructor can be needed in an unevaluated context, in
7631 // particular, in the operand of a noexcept-expression, and we can be
7632 // unable to compute an exception specification for an enclosed class.
7634 // We do not allow an in-class initializer to require the evaluation
7635 // of the exception specification for any in-class initializer whose
7636 // definition is not lexically complete.
7637 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD;
7638 } else if (const RecordType *RecordTy
7639 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) {
7640 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
7641 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl);
7642 // If this is a deleted function, add it anyway. This might be conformant
7643 // with the standard. This might not. I'm not sure. It might not matter.
7644 // In particular, the problem is that this function never gets called. It
7645 // might just be ill-formed because this function attempts to refer to
7646 // a deleted function here.
7648 ExceptSpec.CalledDecl(F->getLocation(), Constructor);
7655 Sema::ImplicitExceptionSpecification
7656 Sema::ComputeInheritingCtorExceptionSpec(CXXConstructorDecl *CD) {
7657 CXXRecordDecl *ClassDecl = CD->getParent();
7659 // C++ [except.spec]p14:
7660 // An inheriting constructor [...] shall have an exception-specification. [...]
7661 ImplicitExceptionSpecification ExceptSpec(*this);
7662 if (ClassDecl->isInvalidDecl())
7665 // Inherited constructor.
7666 const CXXConstructorDecl *InheritedCD = CD->getInheritedConstructor();
7667 const CXXRecordDecl *InheritedDecl = InheritedCD->getParent();
7668 // FIXME: Copying or moving the parameters could add extra exceptions to the
7669 // set, as could the default arguments for the inherited constructor. This
7670 // will be addressed when we implement the resolution of core issue 1351.
7671 ExceptSpec.CalledDecl(CD->getLocStart(), InheritedCD);
7673 // Direct base-class constructors.
7674 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
7675 BEnd = ClassDecl->bases_end();
7677 if (B->isVirtual()) // Handled below.
7680 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
7681 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
7682 if (BaseClassDecl == InheritedDecl)
7684 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
7686 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
7690 // Virtual base-class constructors.
7691 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
7692 BEnd = ClassDecl->vbases_end();
7694 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
7695 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
7696 if (BaseClassDecl == InheritedDecl)
7698 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
7700 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
7704 // Field constructors.
7705 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
7706 FEnd = ClassDecl->field_end();
7708 if (F->hasInClassInitializer()) {
7709 if (Expr *E = F->getInClassInitializer())
7710 ExceptSpec.CalledExpr(E);
7711 else if (!F->isInvalidDecl())
7712 Diag(CD->getLocation(),
7713 diag::err_in_class_initializer_references_def_ctor) << CD;
7714 } else if (const RecordType *RecordTy
7715 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) {
7716 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
7717 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl);
7719 ExceptSpec.CalledDecl(F->getLocation(), Constructor);
7727 /// RAII object to register a special member as being currently declared.
7728 struct DeclaringSpecialMember {
7730 Sema::SpecialMemberDecl D;
7731 bool WasAlreadyBeingDeclared;
7733 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM)
7734 : S(S), D(RD, CSM) {
7735 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D);
7736 if (WasAlreadyBeingDeclared)
7737 // This almost never happens, but if it does, ensure that our cache
7738 // doesn't contain a stale result.
7739 S.SpecialMemberCache.clear();
7741 // FIXME: Register a note to be produced if we encounter an error while
7742 // declaring the special member.
7744 ~DeclaringSpecialMember() {
7745 if (!WasAlreadyBeingDeclared)
7746 S.SpecialMembersBeingDeclared.erase(D);
7749 /// \brief Are we already trying to declare this special member?
7750 bool isAlreadyBeingDeclared() const {
7751 return WasAlreadyBeingDeclared;
7756 CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor(
7757 CXXRecordDecl *ClassDecl) {
7758 // C++ [class.ctor]p5:
7759 // A default constructor for a class X is a constructor of class X
7760 // that can be called without an argument. If there is no
7761 // user-declared constructor for class X, a default constructor is
7762 // implicitly declared. An implicitly-declared default constructor
7763 // is an inline public member of its class.
7764 assert(ClassDecl->needsImplicitDefaultConstructor() &&
7765 "Should not build implicit default constructor!");
7767 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor);
7768 if (DSM.isAlreadyBeingDeclared())
7771 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
7772 CXXDefaultConstructor,
7775 // Create the actual constructor declaration.
7776 CanQualType ClassType
7777 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
7778 SourceLocation ClassLoc = ClassDecl->getLocation();
7779 DeclarationName Name
7780 = Context.DeclarationNames.getCXXConstructorName(ClassType);
7781 DeclarationNameInfo NameInfo(Name, ClassLoc);
7782 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create(
7783 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0,
7784 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true,
7786 DefaultCon->setAccess(AS_public);
7787 DefaultCon->setDefaulted();
7788 DefaultCon->setImplicit();
7790 // Build an exception specification pointing back at this constructor.
7791 FunctionProtoType::ExtProtoInfo EPI;
7792 EPI.ExceptionSpecType = EST_Unevaluated;
7793 EPI.ExceptionSpecDecl = DefaultCon;
7794 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, None, EPI));
7796 // We don't need to use SpecialMemberIsTrivial here; triviality for default
7797 // constructors is easy to compute.
7798 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor());
7800 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor))
7801 SetDeclDeleted(DefaultCon, ClassLoc);
7803 // Note that we have declared this constructor.
7804 ++ASTContext::NumImplicitDefaultConstructorsDeclared;
7806 if (Scope *S = getScopeForContext(ClassDecl))
7807 PushOnScopeChains(DefaultCon, S, false);
7808 ClassDecl->addDecl(DefaultCon);
7813 void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
7814 CXXConstructorDecl *Constructor) {
7815 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&
7816 !Constructor->doesThisDeclarationHaveABody() &&
7817 !Constructor->isDeleted()) &&
7818 "DefineImplicitDefaultConstructor - call it for implicit default ctor");
7820 CXXRecordDecl *ClassDecl = Constructor->getParent();
7821 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor");
7823 SynthesizedFunctionScope Scope(*this, Constructor);
7824 DiagnosticErrorTrap Trap(Diags);
7825 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) ||
7826 Trap.hasErrorOccurred()) {
7827 Diag(CurrentLocation, diag::note_member_synthesized_at)
7828 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl);
7829 Constructor->setInvalidDecl();
7833 SourceLocation Loc = Constructor->getLocation();
7834 Constructor->setBody(new (Context) CompoundStmt(Loc));
7836 Constructor->setUsed();
7837 MarkVTableUsed(CurrentLocation, ClassDecl);
7839 if (ASTMutationListener *L = getASTMutationListener()) {
7840 L->CompletedImplicitDefinition(Constructor);
7844 void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) {
7845 // Check that any explicitly-defaulted methods have exception specifications
7846 // compatible with their implicit exception specifications.
7847 CheckDelayedExplicitlyDefaultedMemberExceptionSpecs();
7851 /// Information on inheriting constructors to declare.
7852 class InheritingConstructorInfo {
7854 InheritingConstructorInfo(Sema &SemaRef, CXXRecordDecl *Derived)
7855 : SemaRef(SemaRef), Derived(Derived) {
7856 // Mark the constructors that we already have in the derived class.
7858 // C++11 [class.inhctor]p3: [...] a constructor is implicitly declared [...]
7859 // unless there is a user-declared constructor with the same signature in
7860 // the class where the using-declaration appears.
7861 visitAll(Derived, &InheritingConstructorInfo::noteDeclaredInDerived);
7864 void inheritAll(CXXRecordDecl *RD) {
7865 visitAll(RD, &InheritingConstructorInfo::inherit);
7869 /// Information about an inheriting constructor.
7870 struct InheritingConstructor {
7871 InheritingConstructor()
7872 : DeclaredInDerived(false), BaseCtor(0), DerivedCtor(0) {}
7874 /// If \c true, a constructor with this signature is already declared
7875 /// in the derived class.
7876 bool DeclaredInDerived;
7878 /// The constructor which is inherited.
7879 const CXXConstructorDecl *BaseCtor;
7881 /// The derived constructor we declared.
7882 CXXConstructorDecl *DerivedCtor;
7885 /// Inheriting constructors with a given canonical type. There can be at
7886 /// most one such non-template constructor, and any number of templated
7888 struct InheritingConstructorsForType {
7889 InheritingConstructor NonTemplate;
7891 std::pair<TemplateParameterList*, InheritingConstructor>, 4> Templates;
7893 InheritingConstructor &getEntry(Sema &S, const CXXConstructorDecl *Ctor) {
7894 if (FunctionTemplateDecl *FTD = Ctor->getDescribedFunctionTemplate()) {
7895 TemplateParameterList *ParamList = FTD->getTemplateParameters();
7896 for (unsigned I = 0, N = Templates.size(); I != N; ++I)
7897 if (S.TemplateParameterListsAreEqual(ParamList, Templates[I].first,
7898 false, S.TPL_TemplateMatch))
7899 return Templates[I].second;
7900 Templates.push_back(std::make_pair(ParamList, InheritingConstructor()));
7901 return Templates.back().second;
7908 /// Get or create the inheriting constructor record for a constructor.
7909 InheritingConstructor &getEntry(const CXXConstructorDecl *Ctor,
7910 QualType CtorType) {
7911 return Map[CtorType.getCanonicalType()->castAs<FunctionProtoType>()]
7912 .getEntry(SemaRef, Ctor);
7915 typedef void (InheritingConstructorInfo::*VisitFn)(const CXXConstructorDecl*);
7917 /// Process all constructors for a class.
7918 void visitAll(const CXXRecordDecl *RD, VisitFn Callback) {
7919 for (CXXRecordDecl::ctor_iterator CtorIt = RD->ctor_begin(),
7920 CtorE = RD->ctor_end();
7921 CtorIt != CtorE; ++CtorIt)
7922 (this->*Callback)(*CtorIt);
7923 for (CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl>
7924 I(RD->decls_begin()), E(RD->decls_end());
7926 const FunctionDecl *FD = (*I)->getTemplatedDecl();
7927 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD))
7928 (this->*Callback)(CD);
7932 /// Note that a constructor (or constructor template) was declared in Derived.
7933 void noteDeclaredInDerived(const CXXConstructorDecl *Ctor) {
7934 getEntry(Ctor, Ctor->getType()).DeclaredInDerived = true;
7937 /// Inherit a single constructor.
7938 void inherit(const CXXConstructorDecl *Ctor) {
7939 const FunctionProtoType *CtorType =
7940 Ctor->getType()->castAs<FunctionProtoType>();
7941 ArrayRef<QualType> ArgTypes(CtorType->getArgTypes());
7942 FunctionProtoType::ExtProtoInfo EPI = CtorType->getExtProtoInfo();
7944 SourceLocation UsingLoc = getUsingLoc(Ctor->getParent());
7946 // Core issue (no number yet): the ellipsis is always discarded.
7948 SemaRef.Diag(UsingLoc, diag::warn_using_decl_constructor_ellipsis);
7949 SemaRef.Diag(Ctor->getLocation(),
7950 diag::note_using_decl_constructor_ellipsis);
7951 EPI.Variadic = false;
7954 // Declare a constructor for each number of parameters.
7956 // C++11 [class.inhctor]p1:
7957 // The candidate set of inherited constructors from the class X named in
7958 // the using-declaration consists of [... modulo defects ...] for each
7959 // constructor or constructor template of X, the set of constructors or
7960 // constructor templates that results from omitting any ellipsis parameter
7961 // specification and successively omitting parameters with a default
7962 // argument from the end of the parameter-type-list
7963 unsigned MinParams = minParamsToInherit(Ctor);
7964 unsigned Params = Ctor->getNumParams();
7965 if (Params >= MinParams) {
7967 declareCtor(UsingLoc, Ctor,
7968 SemaRef.Context.getFunctionType(
7969 Ctor->getResultType(), ArgTypes.slice(0, Params), EPI));
7970 while (Params > MinParams &&
7971 Ctor->getParamDecl(--Params)->hasDefaultArg());
7975 /// Find the using-declaration which specified that we should inherit the
7976 /// constructors of \p Base.
7977 SourceLocation getUsingLoc(const CXXRecordDecl *Base) {
7978 // No fancy lookup required; just look for the base constructor name
7979 // directly within the derived class.
7980 ASTContext &Context = SemaRef.Context;
7981 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName(
7982 Context.getCanonicalType(Context.getRecordType(Base)));
7983 DeclContext::lookup_const_result Decls = Derived->lookup(Name);
7984 return Decls.empty() ? Derived->getLocation() : Decls[0]->getLocation();
7987 unsigned minParamsToInherit(const CXXConstructorDecl *Ctor) {
7988 // C++11 [class.inhctor]p3:
7989 // [F]or each constructor template in the candidate set of inherited
7990 // constructors, a constructor template is implicitly declared
7991 if (Ctor->getDescribedFunctionTemplate())
7994 // For each non-template constructor in the candidate set of inherited
7995 // constructors other than a constructor having no parameters or a
7996 // copy/move constructor having a single parameter, a constructor is
7997 // implicitly declared [...]
7998 if (Ctor->getNumParams() == 0)
8000 if (Ctor->isCopyOrMoveConstructor())
8003 // Per discussion on core reflector, never inherit a constructor which
8004 // would become a default, copy, or move constructor of Derived either.
8005 const ParmVarDecl *PD = Ctor->getParamDecl(0);
8006 const ReferenceType *RT = PD->getType()->getAs<ReferenceType>();
8007 return (RT && RT->getPointeeCXXRecordDecl() == Derived) ? 2 : 1;
8010 /// Declare a single inheriting constructor, inheriting the specified
8011 /// constructor, with the given type.
8012 void declareCtor(SourceLocation UsingLoc, const CXXConstructorDecl *BaseCtor,
8013 QualType DerivedType) {
8014 InheritingConstructor &Entry = getEntry(BaseCtor, DerivedType);
8016 // C++11 [class.inhctor]p3:
8017 // ... a constructor is implicitly declared with the same constructor
8018 // characteristics unless there is a user-declared constructor with
8019 // the same signature in the class where the using-declaration appears
8020 if (Entry.DeclaredInDerived)
8023 // C++11 [class.inhctor]p7:
8024 // If two using-declarations declare inheriting constructors with the
8025 // same signature, the program is ill-formed
8026 if (Entry.DerivedCtor) {
8027 if (BaseCtor->getParent() != Entry.BaseCtor->getParent()) {
8028 // Only diagnose this once per constructor.
8029 if (Entry.DerivedCtor->isInvalidDecl())
8031 Entry.DerivedCtor->setInvalidDecl();
8033 SemaRef.Diag(UsingLoc, diag::err_using_decl_constructor_conflict);
8034 SemaRef.Diag(BaseCtor->getLocation(),
8035 diag::note_using_decl_constructor_conflict_current_ctor);
8036 SemaRef.Diag(Entry.BaseCtor->getLocation(),
8037 diag::note_using_decl_constructor_conflict_previous_ctor);
8038 SemaRef.Diag(Entry.DerivedCtor->getLocation(),
8039 diag::note_using_decl_constructor_conflict_previous_using);
8041 // Core issue (no number): if the same inheriting constructor is
8042 // produced by multiple base class constructors from the same base
8043 // class, the inheriting constructor is defined as deleted.
8044 SemaRef.SetDeclDeleted(Entry.DerivedCtor, UsingLoc);
8050 ASTContext &Context = SemaRef.Context;
8051 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName(
8052 Context.getCanonicalType(Context.getRecordType(Derived)));
8053 DeclarationNameInfo NameInfo(Name, UsingLoc);
8055 TemplateParameterList *TemplateParams = 0;
8056 if (const FunctionTemplateDecl *FTD =
8057 BaseCtor->getDescribedFunctionTemplate()) {
8058 TemplateParams = FTD->getTemplateParameters();
8059 // We're reusing template parameters from a different DeclContext. This
8060 // is questionable at best, but works out because the template depth in
8061 // both places is guaranteed to be 0.
8062 // FIXME: Rebuild the template parameters in the new context, and
8063 // transform the function type to refer to them.
8066 // Build type source info pointing at the using-declaration. This is
8067 // required by template instantiation.
8068 TypeSourceInfo *TInfo =
8069 Context.getTrivialTypeSourceInfo(DerivedType, UsingLoc);
8070 FunctionProtoTypeLoc ProtoLoc =
8071 TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>();
8073 CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create(
8074 Context, Derived, UsingLoc, NameInfo, DerivedType,
8075 TInfo, BaseCtor->isExplicit(), /*Inline=*/true,
8076 /*ImplicitlyDeclared=*/true, /*Constexpr=*/BaseCtor->isConstexpr());
8078 // Build an unevaluated exception specification for this constructor.
8079 const FunctionProtoType *FPT = DerivedType->castAs<FunctionProtoType>();
8080 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
8081 EPI.ExceptionSpecType = EST_Unevaluated;
8082 EPI.ExceptionSpecDecl = DerivedCtor;
8083 DerivedCtor->setType(Context.getFunctionType(FPT->getResultType(),
8084 FPT->getArgTypes(), EPI));
8086 // Build the parameter declarations.
8087 SmallVector<ParmVarDecl *, 16> ParamDecls;
8088 for (unsigned I = 0, N = FPT->getNumArgs(); I != N; ++I) {
8089 TypeSourceInfo *TInfo =
8090 Context.getTrivialTypeSourceInfo(FPT->getArgType(I), UsingLoc);
8091 ParmVarDecl *PD = ParmVarDecl::Create(
8092 Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/0,
8093 FPT->getArgType(I), TInfo, SC_None, /*DefaultArg=*/0);
8094 PD->setScopeInfo(0, I);
8096 ParamDecls.push_back(PD);
8097 ProtoLoc.setArg(I, PD);
8100 // Set up the new constructor.
8101 DerivedCtor->setAccess(BaseCtor->getAccess());
8102 DerivedCtor->setParams(ParamDecls);
8103 DerivedCtor->setInheritedConstructor(BaseCtor);
8104 if (BaseCtor->isDeleted())
8105 SemaRef.SetDeclDeleted(DerivedCtor, UsingLoc);
8107 // If this is a constructor template, build the template declaration.
8108 if (TemplateParams) {
8109 FunctionTemplateDecl *DerivedTemplate =
8110 FunctionTemplateDecl::Create(SemaRef.Context, Derived, UsingLoc, Name,
8111 TemplateParams, DerivedCtor);
8112 DerivedTemplate->setAccess(BaseCtor->getAccess());
8113 DerivedCtor->setDescribedFunctionTemplate(DerivedTemplate);
8114 Derived->addDecl(DerivedTemplate);
8116 Derived->addDecl(DerivedCtor);
8119 Entry.BaseCtor = BaseCtor;
8120 Entry.DerivedCtor = DerivedCtor;
8124 CXXRecordDecl *Derived;
8125 typedef llvm::DenseMap<const Type *, InheritingConstructorsForType> MapType;
8130 void Sema::DeclareInheritingConstructors(CXXRecordDecl *ClassDecl) {
8131 // Defer declaring the inheriting constructors until the class is
8133 if (ClassDecl->isDependentContext())
8136 // Find base classes from which we might inherit constructors.
8137 SmallVector<CXXRecordDecl*, 4> InheritedBases;
8138 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(),
8139 BaseE = ClassDecl->bases_end();
8140 BaseIt != BaseE; ++BaseIt)
8141 if (BaseIt->getInheritConstructors())
8142 InheritedBases.push_back(BaseIt->getType()->getAsCXXRecordDecl());
8144 // Go no further if we're not inheriting any constructors.
8145 if (InheritedBases.empty())
8148 // Declare the inherited constructors.
8149 InheritingConstructorInfo ICI(*this, ClassDecl);
8150 for (unsigned I = 0, N = InheritedBases.size(); I != N; ++I)
8151 ICI.inheritAll(InheritedBases[I]);
8154 void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation,
8155 CXXConstructorDecl *Constructor) {
8156 CXXRecordDecl *ClassDecl = Constructor->getParent();
8157 assert(Constructor->getInheritedConstructor() &&
8158 !Constructor->doesThisDeclarationHaveABody() &&
8159 !Constructor->isDeleted());
8161 SynthesizedFunctionScope Scope(*this, Constructor);
8162 DiagnosticErrorTrap Trap(Diags);
8163 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) ||
8164 Trap.hasErrorOccurred()) {
8165 Diag(CurrentLocation, diag::note_inhctor_synthesized_at)
8166 << Context.getTagDeclType(ClassDecl);
8167 Constructor->setInvalidDecl();
8171 SourceLocation Loc = Constructor->getLocation();
8172 Constructor->setBody(new (Context) CompoundStmt(Loc));
8174 Constructor->setUsed();
8175 MarkVTableUsed(CurrentLocation, ClassDecl);
8177 if (ASTMutationListener *L = getASTMutationListener()) {
8178 L->CompletedImplicitDefinition(Constructor);
8183 Sema::ImplicitExceptionSpecification
8184 Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) {
8185 CXXRecordDecl *ClassDecl = MD->getParent();
8187 // C++ [except.spec]p14:
8188 // An implicitly declared special member function (Clause 12) shall have
8189 // an exception-specification.
8190 ImplicitExceptionSpecification ExceptSpec(*this);
8191 if (ClassDecl->isInvalidDecl())
8194 // Direct base-class destructors.
8195 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
8196 BEnd = ClassDecl->bases_end();
8198 if (B->isVirtual()) // Handled below.
8201 if (const RecordType *BaseType = B->getType()->getAs<RecordType>())
8202 ExceptSpec.CalledDecl(B->getLocStart(),
8203 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl())));
8206 // Virtual base-class destructors.
8207 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
8208 BEnd = ClassDecl->vbases_end();
8210 if (const RecordType *BaseType = B->getType()->getAs<RecordType>())
8211 ExceptSpec.CalledDecl(B->getLocStart(),
8212 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl())));
8215 // Field destructors.
8216 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
8217 FEnd = ClassDecl->field_end();
8219 if (const RecordType *RecordTy
8220 = Context.getBaseElementType(F->getType())->getAs<RecordType>())
8221 ExceptSpec.CalledDecl(F->getLocation(),
8222 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl())));
8228 CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) {
8229 // C++ [class.dtor]p2:
8230 // If a class has no user-declared destructor, a destructor is
8231 // declared implicitly. An implicitly-declared destructor is an
8232 // inline public member of its class.
8233 assert(ClassDecl->needsImplicitDestructor());
8235 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor);
8236 if (DSM.isAlreadyBeingDeclared())
8239 // Create the actual destructor declaration.
8240 CanQualType ClassType
8241 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
8242 SourceLocation ClassLoc = ClassDecl->getLocation();
8243 DeclarationName Name
8244 = Context.DeclarationNames.getCXXDestructorName(ClassType);
8245 DeclarationNameInfo NameInfo(Name, ClassLoc);
8246 CXXDestructorDecl *Destructor
8247 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo,
8248 QualType(), 0, /*isInline=*/true,
8249 /*isImplicitlyDeclared=*/true);
8250 Destructor->setAccess(AS_public);
8251 Destructor->setDefaulted();
8252 Destructor->setImplicit();
8254 // Build an exception specification pointing back at this destructor.
8255 FunctionProtoType::ExtProtoInfo EPI;
8256 EPI.ExceptionSpecType = EST_Unevaluated;
8257 EPI.ExceptionSpecDecl = Destructor;
8258 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI));
8260 AddOverriddenMethods(ClassDecl, Destructor);
8262 // We don't need to use SpecialMemberIsTrivial here; triviality for
8263 // destructors is easy to compute.
8264 Destructor->setTrivial(ClassDecl->hasTrivialDestructor());
8266 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor))
8267 SetDeclDeleted(Destructor, ClassLoc);
8269 // Note that we have declared this destructor.
8270 ++ASTContext::NumImplicitDestructorsDeclared;
8272 // Introduce this destructor into its scope.
8273 if (Scope *S = getScopeForContext(ClassDecl))
8274 PushOnScopeChains(Destructor, S, false);
8275 ClassDecl->addDecl(Destructor);
8280 void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation,
8281 CXXDestructorDecl *Destructor) {
8282 assert((Destructor->isDefaulted() &&
8283 !Destructor->doesThisDeclarationHaveABody() &&
8284 !Destructor->isDeleted()) &&
8285 "DefineImplicitDestructor - call it for implicit default dtor");
8286 CXXRecordDecl *ClassDecl = Destructor->getParent();
8287 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor");
8289 if (Destructor->isInvalidDecl())
8292 SynthesizedFunctionScope Scope(*this, Destructor);
8294 DiagnosticErrorTrap Trap(Diags);
8295 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
8296 Destructor->getParent());
8298 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) {
8299 Diag(CurrentLocation, diag::note_member_synthesized_at)
8300 << CXXDestructor << Context.getTagDeclType(ClassDecl);
8302 Destructor->setInvalidDecl();
8306 SourceLocation Loc = Destructor->getLocation();
8307 Destructor->setBody(new (Context) CompoundStmt(Loc));
8308 Destructor->setImplicitlyDefined(true);
8309 Destructor->setUsed();
8310 MarkVTableUsed(CurrentLocation, ClassDecl);
8312 if (ASTMutationListener *L = getASTMutationListener()) {
8313 L->CompletedImplicitDefinition(Destructor);
8317 /// \brief Perform any semantic analysis which needs to be delayed until all
8318 /// pending class member declarations have been parsed.
8319 void Sema::ActOnFinishCXXMemberDecls() {
8320 // If the context is an invalid C++ class, just suppress these checks.
8321 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) {
8322 if (Record->isInvalidDecl()) {
8323 DelayedDestructorExceptionSpecChecks.clear();
8328 // Perform any deferred checking of exception specifications for virtual
8330 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size();
8332 const CXXDestructorDecl *Dtor =
8333 DelayedDestructorExceptionSpecChecks[i].first;
8334 assert(!Dtor->getParent()->isDependentType() &&
8335 "Should not ever add destructors of templates into the list.");
8336 CheckOverridingFunctionExceptionSpec(Dtor,
8337 DelayedDestructorExceptionSpecChecks[i].second);
8339 DelayedDestructorExceptionSpecChecks.clear();
8342 void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl,
8343 CXXDestructorDecl *Destructor) {
8344 assert(getLangOpts().CPlusPlus11 &&
8345 "adjusting dtor exception specs was introduced in c++11");
8347 // C++11 [class.dtor]p3:
8348 // A declaration of a destructor that does not have an exception-
8349 // specification is implicitly considered to have the same exception-
8350 // specification as an implicit declaration.
8351 const FunctionProtoType *DtorType = Destructor->getType()->
8352 getAs<FunctionProtoType>();
8353 if (DtorType->hasExceptionSpec())
8356 // Replace the destructor's type, building off the existing one. Fortunately,
8357 // the only thing of interest in the destructor type is its extended info.
8358 // The return and arguments are fixed.
8359 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo();
8360 EPI.ExceptionSpecType = EST_Unevaluated;
8361 EPI.ExceptionSpecDecl = Destructor;
8362 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI));
8364 // FIXME: If the destructor has a body that could throw, and the newly created
8365 // spec doesn't allow exceptions, we should emit a warning, because this
8366 // change in behavior can break conforming C++03 programs at runtime.
8367 // However, we don't have a body or an exception specification yet, so it
8368 // needs to be done somewhere else.
8371 /// When generating a defaulted copy or move assignment operator, if a field
8372 /// should be copied with __builtin_memcpy rather than via explicit assignments,
8373 /// do so. This optimization only applies for arrays of scalars, and for arrays
8374 /// of class type where the selected copy/move-assignment operator is trivial.
8376 buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T,
8377 Expr *To, Expr *From) {
8378 // Compute the size of the memory buffer to be copied.
8379 QualType SizeType = S.Context.getSizeType();
8380 llvm::APInt Size(S.Context.getTypeSize(SizeType),
8381 S.Context.getTypeSizeInChars(T).getQuantity());
8383 // Take the address of the field references for "from" and "to". We
8384 // directly construct UnaryOperators here because semantic analysis
8385 // does not permit us to take the address of an xvalue.
8386 From = new (S.Context) UnaryOperator(From, UO_AddrOf,
8387 S.Context.getPointerType(From->getType()),
8388 VK_RValue, OK_Ordinary, Loc);
8389 To = new (S.Context) UnaryOperator(To, UO_AddrOf,
8390 S.Context.getPointerType(To->getType()),
8391 VK_RValue, OK_Ordinary, Loc);
8393 const Type *E = T->getBaseElementTypeUnsafe();
8394 bool NeedsCollectableMemCpy =
8395 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember();
8397 // Create a reference to the __builtin_objc_memmove_collectable function
8398 StringRef MemCpyName = NeedsCollectableMemCpy ?
8399 "__builtin_objc_memmove_collectable" :
8401 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc,
8402 Sema::LookupOrdinaryName);
8403 S.LookupName(R, S.TUScope, true);
8405 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>();
8407 // Something went horribly wrong earlier, and we will have complained
8411 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy,
8413 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail");
8415 Expr *CallArgs[] = {
8416 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc)
8418 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(),
8419 Loc, CallArgs, Loc);
8421 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!");
8422 return S.Owned(Call.takeAs<Stmt>());
8425 /// \brief Builds a statement that copies/moves the given entity from \p From to
8428 /// This routine is used to copy/move the members of a class with an
8429 /// implicitly-declared copy/move assignment operator. When the entities being
8430 /// copied are arrays, this routine builds for loops to copy them.
8432 /// \param S The Sema object used for type-checking.
8434 /// \param Loc The location where the implicit copy/move is being generated.
8436 /// \param T The type of the expressions being copied/moved. Both expressions
8437 /// must have this type.
8439 /// \param To The expression we are copying/moving to.
8441 /// \param From The expression we are copying/moving from.
8443 /// \param CopyingBaseSubobject Whether we're copying/moving a base subobject.
8444 /// Otherwise, it's a non-static member subobject.
8446 /// \param Copying Whether we're copying or moving.
8448 /// \param Depth Internal parameter recording the depth of the recursion.
8450 /// \returns A statement or a loop that copies the expressions, or StmtResult(0)
8451 /// if a memcpy should be used instead.
8453 buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T,
8454 Expr *To, Expr *From,
8455 bool CopyingBaseSubobject, bool Copying,
8456 unsigned Depth = 0) {
8457 // C++11 [class.copy]p28:
8458 // Each subobject is assigned in the manner appropriate to its type:
8460 // - if the subobject is of class type, as if by a call to operator= with
8461 // the subobject as the object expression and the corresponding
8462 // subobject of x as a single function argument (as if by explicit
8463 // qualification; that is, ignoring any possible virtual overriding
8464 // functions in more derived classes);
8466 // C++03 [class.copy]p13:
8467 // - if the subobject is of class type, the copy assignment operator for
8468 // the class is used (as if by explicit qualification; that is,
8469 // ignoring any possible virtual overriding functions in more derived
8471 if (const RecordType *RecordTy = T->getAs<RecordType>()) {
8472 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
8474 // Look for operator=.
8475 DeclarationName Name
8476 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal);
8477 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName);
8478 S.LookupQualifiedName(OpLookup, ClassDecl, false);
8480 // Prior to C++11, filter out any result that isn't a copy/move-assignment
8482 if (!S.getLangOpts().CPlusPlus11) {
8483 LookupResult::Filter F = OpLookup.makeFilter();
8484 while (F.hasNext()) {
8485 NamedDecl *D = F.next();
8486 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
8487 if (Method->isCopyAssignmentOperator() ||
8488 (!Copying && Method->isMoveAssignmentOperator()))
8496 // Suppress the protected check (C++ [class.protected]) for each of the
8497 // assignment operators we found. This strange dance is required when
8498 // we're assigning via a base classes's copy-assignment operator. To
8499 // ensure that we're getting the right base class subobject (without
8500 // ambiguities), we need to cast "this" to that subobject type; to
8501 // ensure that we don't go through the virtual call mechanism, we need
8502 // to qualify the operator= name with the base class (see below). However,
8503 // this means that if the base class has a protected copy assignment
8504 // operator, the protected member access check will fail. So, we
8505 // rewrite "protected" access to "public" access in this case, since we
8506 // know by construction that we're calling from a derived class.
8507 if (CopyingBaseSubobject) {
8508 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end();
8510 if (L.getAccess() == AS_protected)
8511 L.setAccess(AS_public);
8515 // Create the nested-name-specifier that will be used to qualify the
8516 // reference to operator=; this is required to suppress the virtual
8519 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr());
8520 SS.MakeTrivial(S.Context,
8521 NestedNameSpecifier::Create(S.Context, 0, false,
8525 // Create the reference to operator=.
8526 ExprResult OpEqualRef
8527 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS,
8528 /*TemplateKWLoc=*/SourceLocation(),
8529 /*FirstQualifierInScope=*/0,
8532 /*SuppressQualifierCheck=*/true);
8533 if (OpEqualRef.isInvalid())
8536 // Build the call to the assignment operator.
8538 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0,
8539 OpEqualRef.takeAs<Expr>(),
8540 Loc, &From, 1, Loc);
8541 if (Call.isInvalid())
8544 // If we built a call to a trivial 'operator=' while copying an array,
8545 // bail out. We'll replace the whole shebang with a memcpy.
8546 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get());
8547 if (CE && CE->getMethodDecl()->isTrivial() && Depth)
8548 return StmtResult((Stmt*)0);
8550 // Convert to an expression-statement, and clean up any produced
8552 return S.ActOnExprStmt(Call);
8555 // - if the subobject is of scalar type, the built-in assignment
8556 // operator is used.
8557 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T);
8559 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From);
8560 if (Assignment.isInvalid())
8562 return S.ActOnExprStmt(Assignment);
8565 // - if the subobject is an array, each element is assigned, in the
8566 // manner appropriate to the element type;
8568 // Construct a loop over the array bounds, e.g.,
8570 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0)
8572 // that will copy each of the array elements.
8573 QualType SizeType = S.Context.getSizeType();
8575 // Create the iteration variable.
8576 IdentifierInfo *IterationVarName = 0;
8579 llvm::raw_svector_ostream OS(Str);
8580 OS << "__i" << Depth;
8581 IterationVarName = &S.Context.Idents.get(OS.str());
8583 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc,
8584 IterationVarName, SizeType,
8585 S.Context.getTrivialTypeSourceInfo(SizeType, Loc),
8588 // Initialize the iteration variable to zero.
8589 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0);
8590 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc));
8592 // Create a reference to the iteration variable; we'll use this several
8593 // times throughout.
8594 Expr *IterationVarRef
8595 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take();
8596 assert(IterationVarRef && "Reference to invented variable cannot fail!");
8597 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take();
8598 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!");
8600 // Create the DeclStmt that holds the iteration variable.
8601 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc);
8603 // Subscript the "from" and "to" expressions with the iteration variable.
8604 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc,
8605 IterationVarRefRVal,
8607 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc,
8608 IterationVarRefRVal,
8610 if (!Copying) // Cast to rvalue
8611 From = CastForMoving(S, From);
8613 // Build the copy/move for an individual element of the array.
8615 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(),
8616 To, From, CopyingBaseSubobject,
8617 Copying, Depth + 1);
8618 // Bail out if copying fails or if we determined that we should use memcpy.
8619 if (Copy.isInvalid() || !Copy.get())
8622 // Create the comparison against the array bound.
8624 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType));
8626 = new (S.Context) BinaryOperator(IterationVarRefRVal,
8627 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc),
8628 BO_NE, S.Context.BoolTy,
8629 VK_RValue, OK_Ordinary, Loc, false);
8631 // Create the pre-increment of the iteration variable.
8633 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType,
8634 VK_LValue, OK_Ordinary, Loc);
8636 // Construct the loop that copies all elements of this array.
8637 return S.ActOnForStmt(Loc, Loc, InitStmt,
8638 S.MakeFullExpr(Comparison),
8639 0, S.MakeFullDiscardedValueExpr(Increment),
8644 buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T,
8645 Expr *To, Expr *From,
8646 bool CopyingBaseSubobject, bool Copying) {
8647 // Maybe we should use a memcpy?
8648 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() &&
8649 T.isTriviallyCopyableType(S.Context))
8650 return buildMemcpyForAssignmentOp(S, Loc, T, To, From);
8652 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From,
8653 CopyingBaseSubobject,
8656 // If we ended up picking a trivial assignment operator for an array of a
8657 // non-trivially-copyable class type, just emit a memcpy.
8658 if (!Result.isInvalid() && !Result.get())
8659 return buildMemcpyForAssignmentOp(S, Loc, T, To, From);
8664 Sema::ImplicitExceptionSpecification
8665 Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) {
8666 CXXRecordDecl *ClassDecl = MD->getParent();
8668 ImplicitExceptionSpecification ExceptSpec(*this);
8669 if (ClassDecl->isInvalidDecl())
8672 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>();
8673 assert(T->getNumArgs() == 1 && "not a copy assignment op");
8674 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers();
8676 // C++ [except.spec]p14:
8677 // An implicitly declared special member function (Clause 12) shall have an
8678 // exception-specification. [...]
8680 // It is unspecified whether or not an implicit copy assignment operator
8681 // attempts to deduplicate calls to assignment operators of virtual bases are
8682 // made. As such, this exception specification is effectively unspecified.
8683 // Based on a similar decision made for constness in C++0x, we're erring on
8684 // the side of assuming such calls to be made regardless of whether they
8686 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
8687 BaseEnd = ClassDecl->bases_end();
8688 Base != BaseEnd; ++Base) {
8689 if (Base->isVirtual())
8692 CXXRecordDecl *BaseClassDecl
8693 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8694 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl,
8695 ArgQuals, false, 0))
8696 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign);
8699 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
8700 BaseEnd = ClassDecl->vbases_end();
8701 Base != BaseEnd; ++Base) {
8702 CXXRecordDecl *BaseClassDecl
8703 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
8704 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl,
8705 ArgQuals, false, 0))
8706 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign);
8709 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
8710 FieldEnd = ClassDecl->field_end();
8713 QualType FieldType = Context.getBaseElementType(Field->getType());
8714 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
8715 if (CXXMethodDecl *CopyAssign =
8716 LookupCopyingAssignment(FieldClassDecl,
8717 ArgQuals | FieldType.getCVRQualifiers(),
8719 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign);
8726 CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) {
8727 // Note: The following rules are largely analoguous to the copy
8728 // constructor rules. Note that virtual bases are not taken into account
8729 // for determining the argument type of the operator. Note also that
8730 // operators taking an object instead of a reference are allowed.
8731 assert(ClassDecl->needsImplicitCopyAssignment());
8733 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment);
8734 if (DSM.isAlreadyBeingDeclared())
8737 QualType ArgType = Context.getTypeDeclType(ClassDecl);
8738 QualType RetType = Context.getLValueReferenceType(ArgType);
8739 if (ClassDecl->implicitCopyAssignmentHasConstParam())
8740 ArgType = ArgType.withConst();
8741 ArgType = Context.getLValueReferenceType(ArgType);
8743 // An implicitly-declared copy assignment operator is an inline public
8744 // member of its class.
8745 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
8746 SourceLocation ClassLoc = ClassDecl->getLocation();
8747 DeclarationNameInfo NameInfo(Name, ClassLoc);
8748 CXXMethodDecl *CopyAssignment
8749 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(),
8751 /*StorageClass=*/SC_None,
8752 /*isInline=*/true, /*isConstexpr=*/false,
8754 CopyAssignment->setAccess(AS_public);
8755 CopyAssignment->setDefaulted();
8756 CopyAssignment->setImplicit();
8758 // Build an exception specification pointing back at this member.
8759 FunctionProtoType::ExtProtoInfo EPI;
8760 EPI.ExceptionSpecType = EST_Unevaluated;
8761 EPI.ExceptionSpecDecl = CopyAssignment;
8762 CopyAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI));
8764 // Add the parameter to the operator.
8765 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment,
8766 ClassLoc, ClassLoc, /*Id=*/0,
8767 ArgType, /*TInfo=*/0,
8769 CopyAssignment->setParams(FromParam);
8771 AddOverriddenMethods(ClassDecl, CopyAssignment);
8773 CopyAssignment->setTrivial(
8774 ClassDecl->needsOverloadResolutionForCopyAssignment()
8775 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment)
8776 : ClassDecl->hasTrivialCopyAssignment());
8778 // C++0x [class.copy]p19:
8779 // .... If the class definition does not explicitly declare a copy
8780 // assignment operator, there is no user-declared move constructor, and
8781 // there is no user-declared move assignment operator, a copy assignment
8782 // operator is implicitly declared as defaulted.
8783 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment))
8784 SetDeclDeleted(CopyAssignment, ClassLoc);
8786 // Note that we have added this copy-assignment operator.
8787 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared;
8789 if (Scope *S = getScopeForContext(ClassDecl))
8790 PushOnScopeChains(CopyAssignment, S, false);
8791 ClassDecl->addDecl(CopyAssignment);
8793 return CopyAssignment;
8796 void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation,
8797 CXXMethodDecl *CopyAssignOperator) {
8798 assert((CopyAssignOperator->isDefaulted() &&
8799 CopyAssignOperator->isOverloadedOperator() &&
8800 CopyAssignOperator->getOverloadedOperator() == OO_Equal &&
8801 !CopyAssignOperator->doesThisDeclarationHaveABody() &&
8802 !CopyAssignOperator->isDeleted()) &&
8803 "DefineImplicitCopyAssignment called for wrong function");
8805 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent();
8807 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) {
8808 CopyAssignOperator->setInvalidDecl();
8812 CopyAssignOperator->setUsed();
8814 SynthesizedFunctionScope Scope(*this, CopyAssignOperator);
8815 DiagnosticErrorTrap Trap(Diags);
8817 // C++0x [class.copy]p30:
8818 // The implicitly-defined or explicitly-defaulted copy assignment operator
8819 // for a non-union class X performs memberwise copy assignment of its
8820 // subobjects. The direct base classes of X are assigned first, in the
8821 // order of their declaration in the base-specifier-list, and then the
8822 // immediate non-static data members of X are assigned, in the order in
8823 // which they were declared in the class definition.
8825 // The statements that form the synthesized function body.
8826 SmallVector<Stmt*, 8> Statements;
8828 // The parameter for the "other" object, which we are copying from.
8829 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0);
8830 Qualifiers OtherQuals = Other->getType().getQualifiers();
8831 QualType OtherRefType = Other->getType();
8832 if (const LValueReferenceType *OtherRef
8833 = OtherRefType->getAs<LValueReferenceType>()) {
8834 OtherRefType = OtherRef->getPointeeType();
8835 OtherQuals = OtherRefType.getQualifiers();
8838 // Our location for everything implicitly-generated.
8839 SourceLocation Loc = CopyAssignOperator->getLocation();
8841 // Construct a reference to the "other" object. We'll be using this
8842 // throughout the generated ASTs.
8843 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take();
8844 assert(OtherRef && "Reference to parameter cannot fail!");
8846 // Construct the "this" pointer. We'll be using this throughout the generated
8848 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>();
8849 assert(This && "Reference to this cannot fail!");
8851 // Assign base classes.
8852 bool Invalid = false;
8853 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
8854 E = ClassDecl->bases_end(); Base != E; ++Base) {
8855 // Form the assignment:
8856 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other));
8857 QualType BaseType = Base->getType().getUnqualifiedType();
8858 if (!BaseType->isRecordType()) {
8863 CXXCastPath BasePath;
8864 BasePath.push_back(Base);
8866 // Construct the "from" expression, which is an implicit cast to the
8867 // appropriately-qualified base type.
8868 Expr *From = OtherRef;
8869 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals),
8870 CK_UncheckedDerivedToBase,
8871 VK_LValue, &BasePath).take();
8873 // Dereference "this".
8874 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This);
8876 // Implicitly cast "this" to the appropriately-qualified base type.
8877 To = ImpCastExprToType(To.take(),
8878 Context.getCVRQualifiedType(BaseType,
8879 CopyAssignOperator->getTypeQualifiers()),
8880 CK_UncheckedDerivedToBase,
8881 VK_LValue, &BasePath);
8884 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType,
8886 /*CopyingBaseSubobject=*/true,
8888 if (Copy.isInvalid()) {
8889 Diag(CurrentLocation, diag::note_member_synthesized_at)
8890 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
8891 CopyAssignOperator->setInvalidDecl();
8895 // Success! Record the copy.
8896 Statements.push_back(Copy.takeAs<Expr>());
8899 // Assign non-static members.
8900 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
8901 FieldEnd = ClassDecl->field_end();
8902 Field != FieldEnd; ++Field) {
8903 if (Field->isUnnamedBitfield())
8906 // Check for members of reference type; we can't copy those.
8907 if (Field->getType()->isReferenceType()) {
8908 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
8909 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
8910 Diag(Field->getLocation(), diag::note_declared_at);
8911 Diag(CurrentLocation, diag::note_member_synthesized_at)
8912 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
8917 // Check for members of const-qualified, non-class type.
8918 QualType BaseType = Context.getBaseElementType(Field->getType());
8919 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
8920 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
8921 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
8922 Diag(Field->getLocation(), diag::note_declared_at);
8923 Diag(CurrentLocation, diag::note_member_synthesized_at)
8924 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
8929 // Suppress assigning zero-width bitfields.
8930 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0)
8933 QualType FieldType = Field->getType().getNonReferenceType();
8934 if (FieldType->isIncompleteArrayType()) {
8935 assert(ClassDecl->hasFlexibleArrayMember() &&
8936 "Incomplete array type is not valid");
8940 // Build references to the field in the object we're copying from and to.
8941 CXXScopeSpec SS; // Intentionally empty
8942 LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
8944 MemberLookup.addDecl(*Field);
8945 MemberLookup.resolveKind();
8946 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType,
8947 Loc, /*IsArrow=*/false,
8948 SS, SourceLocation(), 0,
8950 ExprResult To = BuildMemberReferenceExpr(This, This->getType(),
8951 Loc, /*IsArrow=*/true,
8952 SS, SourceLocation(), 0,
8954 assert(!From.isInvalid() && "Implicit field reference cannot fail");
8955 assert(!To.isInvalid() && "Implicit field reference cannot fail");
8957 // Build the copy of this field.
8958 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType,
8959 To.get(), From.get(),
8960 /*CopyingBaseSubobject=*/false,
8962 if (Copy.isInvalid()) {
8963 Diag(CurrentLocation, diag::note_member_synthesized_at)
8964 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
8965 CopyAssignOperator->setInvalidDecl();
8969 // Success! Record the copy.
8970 Statements.push_back(Copy.takeAs<Stmt>());
8974 // Add a "return *this;"
8975 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This);
8977 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get());
8978 if (Return.isInvalid())
8981 Statements.push_back(Return.takeAs<Stmt>());
8983 if (Trap.hasErrorOccurred()) {
8984 Diag(CurrentLocation, diag::note_member_synthesized_at)
8985 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
8992 CopyAssignOperator->setInvalidDecl();
8998 CompoundScopeRAII CompoundScope(*this);
8999 Body = ActOnCompoundStmt(Loc, Loc, Statements,
9000 /*isStmtExpr=*/false);
9001 assert(!Body.isInvalid() && "Compound statement creation cannot fail");
9003 CopyAssignOperator->setBody(Body.takeAs<Stmt>());
9005 if (ASTMutationListener *L = getASTMutationListener()) {
9006 L->CompletedImplicitDefinition(CopyAssignOperator);
9010 Sema::ImplicitExceptionSpecification
9011 Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) {
9012 CXXRecordDecl *ClassDecl = MD->getParent();
9014 ImplicitExceptionSpecification ExceptSpec(*this);
9015 if (ClassDecl->isInvalidDecl())
9018 // C++0x [except.spec]p14:
9019 // An implicitly declared special member function (Clause 12) shall have an
9020 // exception-specification. [...]
9022 // It is unspecified whether or not an implicit move assignment operator
9023 // attempts to deduplicate calls to assignment operators of virtual bases are
9024 // made. As such, this exception specification is effectively unspecified.
9025 // Based on a similar decision made for constness in C++0x, we're erring on
9026 // the side of assuming such calls to be made regardless of whether they
9028 // Note that a move constructor is not implicitly declared when there are
9029 // virtual bases, but it can still be user-declared and explicitly defaulted.
9030 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
9031 BaseEnd = ClassDecl->bases_end();
9032 Base != BaseEnd; ++Base) {
9033 if (Base->isVirtual())
9036 CXXRecordDecl *BaseClassDecl
9037 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
9038 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl,
9040 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign);
9043 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
9044 BaseEnd = ClassDecl->vbases_end();
9045 Base != BaseEnd; ++Base) {
9046 CXXRecordDecl *BaseClassDecl
9047 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
9048 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl,
9050 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign);
9053 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
9054 FieldEnd = ClassDecl->field_end();
9057 QualType FieldType = Context.getBaseElementType(Field->getType());
9058 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
9059 if (CXXMethodDecl *MoveAssign =
9060 LookupMovingAssignment(FieldClassDecl,
9061 FieldType.getCVRQualifiers(),
9063 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign);
9070 /// Determine whether the class type has any direct or indirect virtual base
9071 /// classes which have a non-trivial move assignment operator.
9073 hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) {
9074 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
9075 BaseEnd = ClassDecl->vbases_end();
9076 Base != BaseEnd; ++Base) {
9077 CXXRecordDecl *BaseClass =
9078 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
9080 // Try to declare the move assignment. If it would be deleted, then the
9081 // class does not have a non-trivial move assignment.
9082 if (BaseClass->needsImplicitMoveAssignment())
9083 S.DeclareImplicitMoveAssignment(BaseClass);
9085 if (BaseClass->hasNonTrivialMoveAssignment())
9092 /// Determine whether the given type either has a move constructor or is
9093 /// trivially copyable.
9095 hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) {
9096 Type = S.Context.getBaseElementType(Type);
9098 // FIXME: Technically, non-trivially-copyable non-class types, such as
9099 // reference types, are supposed to return false here, but that appears
9100 // to be a standard defect.
9101 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl();
9102 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl())
9105 if (Type.isTriviallyCopyableType(S.Context))
9108 if (IsConstructor) {
9109 // FIXME: Need this because otherwise hasMoveConstructor isn't guaranteed to
9110 // give the right answer.
9111 if (ClassDecl->needsImplicitMoveConstructor())
9112 S.DeclareImplicitMoveConstructor(ClassDecl);
9113 return ClassDecl->hasMoveConstructor();
9116 // FIXME: Need this because otherwise hasMoveAssignment isn't guaranteed to
9117 // give the right answer.
9118 if (ClassDecl->needsImplicitMoveAssignment())
9119 S.DeclareImplicitMoveAssignment(ClassDecl);
9120 return ClassDecl->hasMoveAssignment();
9123 /// Determine whether all non-static data members and direct or virtual bases
9124 /// of class \p ClassDecl have either a move operation, or are trivially
9126 static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl,
9127 bool IsConstructor) {
9128 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
9129 BaseEnd = ClassDecl->bases_end();
9130 Base != BaseEnd; ++Base) {
9131 if (Base->isVirtual())
9134 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor))
9138 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
9139 BaseEnd = ClassDecl->vbases_end();
9140 Base != BaseEnd; ++Base) {
9141 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor))
9145 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
9146 FieldEnd = ClassDecl->field_end();
9147 Field != FieldEnd; ++Field) {
9148 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor))
9155 CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) {
9156 // C++11 [class.copy]p20:
9157 // If the definition of a class X does not explicitly declare a move
9158 // assignment operator, one will be implicitly declared as defaulted
9161 // - [first 4 bullets]
9162 assert(ClassDecl->needsImplicitMoveAssignment());
9164 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment);
9165 if (DSM.isAlreadyBeingDeclared())
9168 // [Checked after we build the declaration]
9169 // - the move assignment operator would not be implicitly defined as
9173 // - X has no direct or indirect virtual base class with a non-trivial
9174 // move assignment operator, and
9175 // - each of X's non-static data members and direct or virtual base classes
9176 // has a type that either has a move assignment operator or is trivially
9178 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) ||
9179 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) {
9180 ClassDecl->setFailedImplicitMoveAssignment();
9184 // Note: The following rules are largely analoguous to the move
9185 // constructor rules.
9187 QualType ArgType = Context.getTypeDeclType(ClassDecl);
9188 QualType RetType = Context.getLValueReferenceType(ArgType);
9189 ArgType = Context.getRValueReferenceType(ArgType);
9191 // An implicitly-declared move assignment operator is an inline public
9192 // member of its class.
9193 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
9194 SourceLocation ClassLoc = ClassDecl->getLocation();
9195 DeclarationNameInfo NameInfo(Name, ClassLoc);
9196 CXXMethodDecl *MoveAssignment
9197 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(),
9199 /*StorageClass=*/SC_None,
9201 /*isConstexpr=*/false,
9203 MoveAssignment->setAccess(AS_public);
9204 MoveAssignment->setDefaulted();
9205 MoveAssignment->setImplicit();
9207 // Build an exception specification pointing back at this member.
9208 FunctionProtoType::ExtProtoInfo EPI;
9209 EPI.ExceptionSpecType = EST_Unevaluated;
9210 EPI.ExceptionSpecDecl = MoveAssignment;
9211 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI));
9213 // Add the parameter to the operator.
9214 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment,
9215 ClassLoc, ClassLoc, /*Id=*/0,
9216 ArgType, /*TInfo=*/0,
9218 MoveAssignment->setParams(FromParam);
9220 AddOverriddenMethods(ClassDecl, MoveAssignment);
9222 MoveAssignment->setTrivial(
9223 ClassDecl->needsOverloadResolutionForMoveAssignment()
9224 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment)
9225 : ClassDecl->hasTrivialMoveAssignment());
9227 // C++0x [class.copy]p9:
9228 // If the definition of a class X does not explicitly declare a move
9229 // assignment operator, one will be implicitly declared as defaulted if and
9232 // - the move assignment operator would not be implicitly defined as
9234 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) {
9235 // Cache this result so that we don't try to generate this over and over
9236 // on every lookup, leaking memory and wasting time.
9237 ClassDecl->setFailedImplicitMoveAssignment();
9241 // Note that we have added this copy-assignment operator.
9242 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared;
9244 if (Scope *S = getScopeForContext(ClassDecl))
9245 PushOnScopeChains(MoveAssignment, S, false);
9246 ClassDecl->addDecl(MoveAssignment);
9248 return MoveAssignment;
9251 void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation,
9252 CXXMethodDecl *MoveAssignOperator) {
9253 assert((MoveAssignOperator->isDefaulted() &&
9254 MoveAssignOperator->isOverloadedOperator() &&
9255 MoveAssignOperator->getOverloadedOperator() == OO_Equal &&
9256 !MoveAssignOperator->doesThisDeclarationHaveABody() &&
9257 !MoveAssignOperator->isDeleted()) &&
9258 "DefineImplicitMoveAssignment called for wrong function");
9260 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent();
9262 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) {
9263 MoveAssignOperator->setInvalidDecl();
9267 MoveAssignOperator->setUsed();
9269 SynthesizedFunctionScope Scope(*this, MoveAssignOperator);
9270 DiagnosticErrorTrap Trap(Diags);
9272 // C++0x [class.copy]p28:
9273 // The implicitly-defined or move assignment operator for a non-union class
9274 // X performs memberwise move assignment of its subobjects. The direct base
9275 // classes of X are assigned first, in the order of their declaration in the
9276 // base-specifier-list, and then the immediate non-static data members of X
9277 // are assigned, in the order in which they were declared in the class
9280 // The statements that form the synthesized function body.
9281 SmallVector<Stmt*, 8> Statements;
9283 // The parameter for the "other" object, which we are move from.
9284 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0);
9285 QualType OtherRefType = Other->getType()->
9286 getAs<RValueReferenceType>()->getPointeeType();
9287 assert(OtherRefType.getQualifiers() == 0 &&
9288 "Bad argument type of defaulted move assignment");
9290 // Our location for everything implicitly-generated.
9291 SourceLocation Loc = MoveAssignOperator->getLocation();
9293 // Construct a reference to the "other" object. We'll be using this
9294 // throughout the generated ASTs.
9295 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take();
9296 assert(OtherRef && "Reference to parameter cannot fail!");
9298 OtherRef = CastForMoving(*this, OtherRef);
9300 // Construct the "this" pointer. We'll be using this throughout the generated
9302 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>();
9303 assert(This && "Reference to this cannot fail!");
9305 // Assign base classes.
9306 bool Invalid = false;
9307 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
9308 E = ClassDecl->bases_end(); Base != E; ++Base) {
9309 // Form the assignment:
9310 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other));
9311 QualType BaseType = Base->getType().getUnqualifiedType();
9312 if (!BaseType->isRecordType()) {
9317 CXXCastPath BasePath;
9318 BasePath.push_back(Base);
9320 // Construct the "from" expression, which is an implicit cast to the
9321 // appropriately-qualified base type.
9322 Expr *From = OtherRef;
9323 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase,
9324 VK_XValue, &BasePath).take();
9326 // Dereference "this".
9327 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This);
9329 // Implicitly cast "this" to the appropriately-qualified base type.
9330 To = ImpCastExprToType(To.take(),
9331 Context.getCVRQualifiedType(BaseType,
9332 MoveAssignOperator->getTypeQualifiers()),
9333 CK_UncheckedDerivedToBase,
9334 VK_LValue, &BasePath);
9337 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType,
9339 /*CopyingBaseSubobject=*/true,
9341 if (Move.isInvalid()) {
9342 Diag(CurrentLocation, diag::note_member_synthesized_at)
9343 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
9344 MoveAssignOperator->setInvalidDecl();
9348 // Success! Record the move.
9349 Statements.push_back(Move.takeAs<Expr>());
9352 // Assign non-static members.
9353 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
9354 FieldEnd = ClassDecl->field_end();
9355 Field != FieldEnd; ++Field) {
9356 if (Field->isUnnamedBitfield())
9359 // Check for members of reference type; we can't move those.
9360 if (Field->getType()->isReferenceType()) {
9361 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
9362 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
9363 Diag(Field->getLocation(), diag::note_declared_at);
9364 Diag(CurrentLocation, diag::note_member_synthesized_at)
9365 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
9370 // Check for members of const-qualified, non-class type.
9371 QualType BaseType = Context.getBaseElementType(Field->getType());
9372 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
9373 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
9374 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
9375 Diag(Field->getLocation(), diag::note_declared_at);
9376 Diag(CurrentLocation, diag::note_member_synthesized_at)
9377 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
9382 // Suppress assigning zero-width bitfields.
9383 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0)
9386 QualType FieldType = Field->getType().getNonReferenceType();
9387 if (FieldType->isIncompleteArrayType()) {
9388 assert(ClassDecl->hasFlexibleArrayMember() &&
9389 "Incomplete array type is not valid");
9393 // Build references to the field in the object we're copying from and to.
9394 CXXScopeSpec SS; // Intentionally empty
9395 LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
9397 MemberLookup.addDecl(*Field);
9398 MemberLookup.resolveKind();
9399 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType,
9400 Loc, /*IsArrow=*/false,
9401 SS, SourceLocation(), 0,
9403 ExprResult To = BuildMemberReferenceExpr(This, This->getType(),
9404 Loc, /*IsArrow=*/true,
9405 SS, SourceLocation(), 0,
9407 assert(!From.isInvalid() && "Implicit field reference cannot fail");
9408 assert(!To.isInvalid() && "Implicit field reference cannot fail");
9410 assert(!From.get()->isLValue() && // could be xvalue or prvalue
9411 "Member reference with rvalue base must be rvalue except for reference "
9412 "members, which aren't allowed for move assignment.");
9414 // Build the move of this field.
9415 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType,
9416 To.get(), From.get(),
9417 /*CopyingBaseSubobject=*/false,
9419 if (Move.isInvalid()) {
9420 Diag(CurrentLocation, diag::note_member_synthesized_at)
9421 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
9422 MoveAssignOperator->setInvalidDecl();
9426 // Success! Record the copy.
9427 Statements.push_back(Move.takeAs<Stmt>());
9431 // Add a "return *this;"
9432 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This);
9434 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get());
9435 if (Return.isInvalid())
9438 Statements.push_back(Return.takeAs<Stmt>());
9440 if (Trap.hasErrorOccurred()) {
9441 Diag(CurrentLocation, diag::note_member_synthesized_at)
9442 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
9449 MoveAssignOperator->setInvalidDecl();
9455 CompoundScopeRAII CompoundScope(*this);
9456 Body = ActOnCompoundStmt(Loc, Loc, Statements,
9457 /*isStmtExpr=*/false);
9458 assert(!Body.isInvalid() && "Compound statement creation cannot fail");
9460 MoveAssignOperator->setBody(Body.takeAs<Stmt>());
9462 if (ASTMutationListener *L = getASTMutationListener()) {
9463 L->CompletedImplicitDefinition(MoveAssignOperator);
9467 Sema::ImplicitExceptionSpecification
9468 Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) {
9469 CXXRecordDecl *ClassDecl = MD->getParent();
9471 ImplicitExceptionSpecification ExceptSpec(*this);
9472 if (ClassDecl->isInvalidDecl())
9475 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>();
9476 assert(T->getNumArgs() >= 1 && "not a copy ctor");
9477 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers();
9479 // C++ [except.spec]p14:
9480 // An implicitly declared special member function (Clause 12) shall have an
9481 // exception-specification. [...]
9482 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
9483 BaseEnd = ClassDecl->bases_end();
9486 // Virtual bases are handled below.
9487 if (Base->isVirtual())
9490 CXXRecordDecl *BaseClassDecl
9491 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
9492 if (CXXConstructorDecl *CopyConstructor =
9493 LookupCopyingConstructor(BaseClassDecl, Quals))
9494 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor);
9496 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
9497 BaseEnd = ClassDecl->vbases_end();
9500 CXXRecordDecl *BaseClassDecl
9501 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
9502 if (CXXConstructorDecl *CopyConstructor =
9503 LookupCopyingConstructor(BaseClassDecl, Quals))
9504 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor);
9506 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
9507 FieldEnd = ClassDecl->field_end();
9510 QualType FieldType = Context.getBaseElementType(Field->getType());
9511 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
9512 if (CXXConstructorDecl *CopyConstructor =
9513 LookupCopyingConstructor(FieldClassDecl,
9514 Quals | FieldType.getCVRQualifiers()))
9515 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor);
9522 CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor(
9523 CXXRecordDecl *ClassDecl) {
9524 // C++ [class.copy]p4:
9525 // If the class definition does not explicitly declare a copy
9526 // constructor, one is declared implicitly.
9527 assert(ClassDecl->needsImplicitCopyConstructor());
9529 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor);
9530 if (DSM.isAlreadyBeingDeclared())
9533 QualType ClassType = Context.getTypeDeclType(ClassDecl);
9534 QualType ArgType = ClassType;
9535 bool Const = ClassDecl->implicitCopyConstructorHasConstParam();
9537 ArgType = ArgType.withConst();
9538 ArgType = Context.getLValueReferenceType(ArgType);
9540 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
9544 DeclarationName Name
9545 = Context.DeclarationNames.getCXXConstructorName(
9546 Context.getCanonicalType(ClassType));
9547 SourceLocation ClassLoc = ClassDecl->getLocation();
9548 DeclarationNameInfo NameInfo(Name, ClassLoc);
9550 // An implicitly-declared copy constructor is an inline public
9551 // member of its class.
9552 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create(
9553 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0,
9554 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true,
9556 CopyConstructor->setAccess(AS_public);
9557 CopyConstructor->setDefaulted();
9559 // Build an exception specification pointing back at this member.
9560 FunctionProtoType::ExtProtoInfo EPI;
9561 EPI.ExceptionSpecType = EST_Unevaluated;
9562 EPI.ExceptionSpecDecl = CopyConstructor;
9563 CopyConstructor->setType(
9564 Context.getFunctionType(Context.VoidTy, ArgType, EPI));
9566 // Add the parameter to the constructor.
9567 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor,
9569 /*IdentifierInfo=*/0,
9570 ArgType, /*TInfo=*/0,
9572 CopyConstructor->setParams(FromParam);
9574 CopyConstructor->setTrivial(
9575 ClassDecl->needsOverloadResolutionForCopyConstructor()
9576 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor)
9577 : ClassDecl->hasTrivialCopyConstructor());
9579 // C++11 [class.copy]p8:
9580 // ... If the class definition does not explicitly declare a copy
9581 // constructor, there is no user-declared move constructor, and there is no
9582 // user-declared move assignment operator, a copy constructor is implicitly
9583 // declared as defaulted.
9584 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor))
9585 SetDeclDeleted(CopyConstructor, ClassLoc);
9587 // Note that we have declared this constructor.
9588 ++ASTContext::NumImplicitCopyConstructorsDeclared;
9590 if (Scope *S = getScopeForContext(ClassDecl))
9591 PushOnScopeChains(CopyConstructor, S, false);
9592 ClassDecl->addDecl(CopyConstructor);
9594 return CopyConstructor;
9597 void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
9598 CXXConstructorDecl *CopyConstructor) {
9599 assert((CopyConstructor->isDefaulted() &&
9600 CopyConstructor->isCopyConstructor() &&
9601 !CopyConstructor->doesThisDeclarationHaveABody() &&
9602 !CopyConstructor->isDeleted()) &&
9603 "DefineImplicitCopyConstructor - call it for implicit copy ctor");
9605 CXXRecordDecl *ClassDecl = CopyConstructor->getParent();
9606 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor");
9608 SynthesizedFunctionScope Scope(*this, CopyConstructor);
9609 DiagnosticErrorTrap Trap(Diags);
9611 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false) ||
9612 Trap.hasErrorOccurred()) {
9613 Diag(CurrentLocation, diag::note_member_synthesized_at)
9614 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl);
9615 CopyConstructor->setInvalidDecl();
9617 Sema::CompoundScopeRAII CompoundScope(*this);
9618 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(),
9619 CopyConstructor->getLocation(),
9621 /*isStmtExpr=*/false)
9623 CopyConstructor->setImplicitlyDefined(true);
9626 CopyConstructor->setUsed();
9627 if (ASTMutationListener *L = getASTMutationListener()) {
9628 L->CompletedImplicitDefinition(CopyConstructor);
9632 Sema::ImplicitExceptionSpecification
9633 Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) {
9634 CXXRecordDecl *ClassDecl = MD->getParent();
9636 // C++ [except.spec]p14:
9637 // An implicitly declared special member function (Clause 12) shall have an
9638 // exception-specification. [...]
9639 ImplicitExceptionSpecification ExceptSpec(*this);
9640 if (ClassDecl->isInvalidDecl())
9643 // Direct base-class constructors.
9644 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
9645 BEnd = ClassDecl->bases_end();
9647 if (B->isVirtual()) // Handled below.
9650 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
9651 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
9652 CXXConstructorDecl *Constructor =
9653 LookupMovingConstructor(BaseClassDecl, 0);
9654 // If this is a deleted function, add it anyway. This might be conformant
9655 // with the standard. This might not. I'm not sure. It might not matter.
9657 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
9661 // Virtual base-class constructors.
9662 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
9663 BEnd = ClassDecl->vbases_end();
9665 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
9666 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
9667 CXXConstructorDecl *Constructor =
9668 LookupMovingConstructor(BaseClassDecl, 0);
9669 // If this is a deleted function, add it anyway. This might be conformant
9670 // with the standard. This might not. I'm not sure. It might not matter.
9672 ExceptSpec.CalledDecl(B->getLocStart(), Constructor);
9676 // Field constructors.
9677 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
9678 FEnd = ClassDecl->field_end();
9680 QualType FieldType = Context.getBaseElementType(F->getType());
9681 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) {
9682 CXXConstructorDecl *Constructor =
9683 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers());
9684 // If this is a deleted function, add it anyway. This might be conformant
9685 // with the standard. This might not. I'm not sure. It might not matter.
9686 // In particular, the problem is that this function never gets called. It
9687 // might just be ill-formed because this function attempts to refer to
9688 // a deleted function here.
9690 ExceptSpec.CalledDecl(F->getLocation(), Constructor);
9697 CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor(
9698 CXXRecordDecl *ClassDecl) {
9699 // C++11 [class.copy]p9:
9700 // If the definition of a class X does not explicitly declare a move
9701 // constructor, one will be implicitly declared as defaulted if and only if:
9703 // - [first 4 bullets]
9704 assert(ClassDecl->needsImplicitMoveConstructor());
9706 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor);
9707 if (DSM.isAlreadyBeingDeclared())
9710 // [Checked after we build the declaration]
9711 // - the move assignment operator would not be implicitly defined as
9715 // - each of X's non-static data members and direct or virtual base classes
9716 // has a type that either has a move constructor or is trivially copyable.
9717 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) {
9718 ClassDecl->setFailedImplicitMoveConstructor();
9722 QualType ClassType = Context.getTypeDeclType(ClassDecl);
9723 QualType ArgType = Context.getRValueReferenceType(ClassType);
9725 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
9729 DeclarationName Name
9730 = Context.DeclarationNames.getCXXConstructorName(
9731 Context.getCanonicalType(ClassType));
9732 SourceLocation ClassLoc = ClassDecl->getLocation();
9733 DeclarationNameInfo NameInfo(Name, ClassLoc);
9735 // C++0x [class.copy]p11:
9736 // An implicitly-declared copy/move constructor is an inline public
9737 // member of its class.
9738 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create(
9739 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0,
9740 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true,
9742 MoveConstructor->setAccess(AS_public);
9743 MoveConstructor->setDefaulted();
9745 // Build an exception specification pointing back at this member.
9746 FunctionProtoType::ExtProtoInfo EPI;
9747 EPI.ExceptionSpecType = EST_Unevaluated;
9748 EPI.ExceptionSpecDecl = MoveConstructor;
9749 MoveConstructor->setType(
9750 Context.getFunctionType(Context.VoidTy, ArgType, EPI));
9752 // Add the parameter to the constructor.
9753 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor,
9755 /*IdentifierInfo=*/0,
9756 ArgType, /*TInfo=*/0,
9758 MoveConstructor->setParams(FromParam);
9760 MoveConstructor->setTrivial(
9761 ClassDecl->needsOverloadResolutionForMoveConstructor()
9762 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor)
9763 : ClassDecl->hasTrivialMoveConstructor());
9765 // C++0x [class.copy]p9:
9766 // If the definition of a class X does not explicitly declare a move
9767 // constructor, one will be implicitly declared as defaulted if and only if:
9769 // - the move constructor would not be implicitly defined as deleted.
9770 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) {
9771 // Cache this result so that we don't try to generate this over and over
9772 // on every lookup, leaking memory and wasting time.
9773 ClassDecl->setFailedImplicitMoveConstructor();
9777 // Note that we have declared this constructor.
9778 ++ASTContext::NumImplicitMoveConstructorsDeclared;
9780 if (Scope *S = getScopeForContext(ClassDecl))
9781 PushOnScopeChains(MoveConstructor, S, false);
9782 ClassDecl->addDecl(MoveConstructor);
9784 return MoveConstructor;
9787 void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation,
9788 CXXConstructorDecl *MoveConstructor) {
9789 assert((MoveConstructor->isDefaulted() &&
9790 MoveConstructor->isMoveConstructor() &&
9791 !MoveConstructor->doesThisDeclarationHaveABody() &&
9792 !MoveConstructor->isDeleted()) &&
9793 "DefineImplicitMoveConstructor - call it for implicit move ctor");
9795 CXXRecordDecl *ClassDecl = MoveConstructor->getParent();
9796 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor");
9798 SynthesizedFunctionScope Scope(*this, MoveConstructor);
9799 DiagnosticErrorTrap Trap(Diags);
9801 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false) ||
9802 Trap.hasErrorOccurred()) {
9803 Diag(CurrentLocation, diag::note_member_synthesized_at)
9804 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl);
9805 MoveConstructor->setInvalidDecl();
9807 Sema::CompoundScopeRAII CompoundScope(*this);
9808 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(),
9809 MoveConstructor->getLocation(),
9811 /*isStmtExpr=*/false)
9813 MoveConstructor->setImplicitlyDefined(true);
9816 MoveConstructor->setUsed();
9818 if (ASTMutationListener *L = getASTMutationListener()) {
9819 L->CompletedImplicitDefinition(MoveConstructor);
9823 bool Sema::isImplicitlyDeleted(FunctionDecl *FD) {
9824 return FD->isDeleted() &&
9825 (FD->isDefaulted() || FD->isImplicit()) &&
9826 isa<CXXMethodDecl>(FD);
9829 /// \brief Mark the call operator of the given lambda closure type as "used".
9830 static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) {
9831 CXXMethodDecl *CallOperator
9832 = cast<CXXMethodDecl>(
9834 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).front());
9835 CallOperator->setReferenced();
9836 CallOperator->setUsed();
9839 void Sema::DefineImplicitLambdaToFunctionPointerConversion(
9840 SourceLocation CurrentLocation,
9841 CXXConversionDecl *Conv)
9843 CXXRecordDecl *Lambda = Conv->getParent();
9845 // Make sure that the lambda call operator is marked used.
9846 markLambdaCallOperatorUsed(*this, Lambda);
9850 SynthesizedFunctionScope Scope(*this, Conv);
9851 DiagnosticErrorTrap Trap(Diags);
9853 // Return the address of the __invoke function.
9854 DeclarationName InvokeName = &Context.Idents.get("__invoke");
9855 CXXMethodDecl *Invoke
9856 = cast<CXXMethodDecl>(Lambda->lookup(InvokeName).front());
9857 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(),
9858 VK_LValue, Conv->getLocation()).take();
9859 assert(FunctionRef && "Can't refer to __invoke function?");
9860 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take();
9861 Conv->setBody(new (Context) CompoundStmt(Context, Return,
9862 Conv->getLocation(),
9863 Conv->getLocation()));
9865 // Fill in the __invoke function with a dummy implementation. IR generation
9866 // will fill in the actual details.
9868 Invoke->setReferenced();
9869 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation()));
9871 if (ASTMutationListener *L = getASTMutationListener()) {
9872 L->CompletedImplicitDefinition(Conv);
9873 L->CompletedImplicitDefinition(Invoke);
9877 void Sema::DefineImplicitLambdaToBlockPointerConversion(
9878 SourceLocation CurrentLocation,
9879 CXXConversionDecl *Conv)
9883 SynthesizedFunctionScope Scope(*this, Conv);
9884 DiagnosticErrorTrap Trap(Diags);
9886 // Copy-initialize the lambda object as needed to capture it.
9887 Expr *This = ActOnCXXThis(CurrentLocation).take();
9888 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take();
9890 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation,
9891 Conv->getLocation(),
9894 // If we're not under ARC, make sure we still get the _Block_copy/autorelease
9895 // behavior. Note that only the general conversion function does this
9896 // (since it's unusable otherwise); in the case where we inline the
9897 // block literal, it has block literal lifetime semantics.
9898 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount)
9899 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(),
9900 CK_CopyAndAutoreleaseBlockObject,
9901 BuildBlock.get(), 0, VK_RValue);
9903 if (BuildBlock.isInvalid()) {
9904 Diag(CurrentLocation, diag::note_lambda_to_block_conv);
9905 Conv->setInvalidDecl();
9909 // Create the return statement that returns the block from the conversion
9911 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get());
9912 if (Return.isInvalid()) {
9913 Diag(CurrentLocation, diag::note_lambda_to_block_conv);
9914 Conv->setInvalidDecl();
9918 // Set the body of the conversion function.
9919 Stmt *ReturnS = Return.take();
9920 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS,
9921 Conv->getLocation(),
9922 Conv->getLocation()));
9924 // We're done; notify the mutation listener, if any.
9925 if (ASTMutationListener *L = getASTMutationListener()) {
9926 L->CompletedImplicitDefinition(Conv);
9930 /// \brief Determine whether the given list arguments contains exactly one
9931 /// "real" (non-default) argument.
9932 static bool hasOneRealArgument(MultiExprArg Args) {
9933 switch (Args.size()) {
9938 if (!Args[1]->isDefaultArgument())
9943 return !Args[0]->isDefaultArgument();
9950 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
9951 CXXConstructorDecl *Constructor,
9952 MultiExprArg ExprArgs,
9953 bool HadMultipleCandidates,
9954 bool IsListInitialization,
9955 bool RequiresZeroInit,
9956 unsigned ConstructKind,
9957 SourceRange ParenRange) {
9958 bool Elidable = false;
9960 // C++0x [class.copy]p34:
9961 // When certain criteria are met, an implementation is allowed to
9962 // omit the copy/move construction of a class object, even if the
9963 // copy/move constructor and/or destructor for the object have
9964 // side effects. [...]
9965 // - when a temporary class object that has not been bound to a
9966 // reference (12.2) would be copied/moved to a class object
9967 // with the same cv-unqualified type, the copy/move operation
9968 // can be omitted by constructing the temporary object
9969 // directly into the target of the omitted copy/move
9970 if (ConstructKind == CXXConstructExpr::CK_Complete &&
9971 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) {
9972 Expr *SubExpr = ExprArgs[0];
9973 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent());
9976 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor,
9977 Elidable, ExprArgs, HadMultipleCandidates,
9978 IsListInitialization, RequiresZeroInit,
9979 ConstructKind, ParenRange);
9982 /// BuildCXXConstructExpr - Creates a complete call to a constructor,
9983 /// including handling of its default argument expressions.
9985 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
9986 CXXConstructorDecl *Constructor, bool Elidable,
9987 MultiExprArg ExprArgs,
9988 bool HadMultipleCandidates,
9989 bool IsListInitialization,
9990 bool RequiresZeroInit,
9991 unsigned ConstructKind,
9992 SourceRange ParenRange) {
9993 MarkFunctionReferenced(ConstructLoc, Constructor);
9994 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc,
9995 Constructor, Elidable, ExprArgs,
9996 HadMultipleCandidates,
9997 IsListInitialization, RequiresZeroInit,
9998 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind),
10002 void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) {
10003 if (VD->isInvalidDecl()) return;
10005 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl());
10006 if (ClassDecl->isInvalidDecl()) return;
10007 if (ClassDecl->hasIrrelevantDestructor()) return;
10008 if (ClassDecl->isDependentContext()) return;
10010 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl);
10011 MarkFunctionReferenced(VD->getLocation(), Destructor);
10012 CheckDestructorAccess(VD->getLocation(), Destructor,
10013 PDiag(diag::err_access_dtor_var)
10014 << VD->getDeclName()
10016 DiagnoseUseOfDecl(Destructor, VD->getLocation());
10018 if (!VD->hasGlobalStorage()) return;
10020 // Emit warning for non-trivial dtor in global scope (a real global,
10021 // class-static, function-static).
10022 Diag(VD->getLocation(), diag::warn_exit_time_destructor);
10024 // TODO: this should be re-enabled for static locals by !CXAAtExit
10025 if (!VD->isStaticLocal())
10026 Diag(VD->getLocation(), diag::warn_global_destructor);
10029 /// \brief Given a constructor and the set of arguments provided for the
10030 /// constructor, convert the arguments and add any required default arguments
10031 /// to form a proper call to this constructor.
10033 /// \returns true if an error occurred, false otherwise.
10035 Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor,
10036 MultiExprArg ArgsPtr,
10037 SourceLocation Loc,
10038 SmallVectorImpl<Expr*> &ConvertedArgs,
10039 bool AllowExplicit,
10040 bool IsListInitialization) {
10041 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall.
10042 unsigned NumArgs = ArgsPtr.size();
10043 Expr **Args = ArgsPtr.data();
10045 const FunctionProtoType *Proto
10046 = Constructor->getType()->getAs<FunctionProtoType>();
10047 assert(Proto && "Constructor without a prototype?");
10048 unsigned NumArgsInProto = Proto->getNumArgs();
10050 // If too few arguments are available, we'll fill in the rest with defaults.
10051 if (NumArgs < NumArgsInProto)
10052 ConvertedArgs.reserve(NumArgsInProto);
10054 ConvertedArgs.reserve(NumArgs);
10056 VariadicCallType CallType =
10057 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;
10058 SmallVector<Expr *, 8> AllArgs;
10059 bool Invalid = GatherArgumentsForCall(Loc, Constructor,
10060 Proto, 0, Args, NumArgs, AllArgs,
10061 CallType, AllowExplicit,
10062 IsListInitialization);
10063 ConvertedArgs.append(AllArgs.begin(), AllArgs.end());
10065 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size());
10067 CheckConstructorCall(Constructor,
10068 llvm::makeArrayRef<const Expr *>(AllArgs.data(),
10076 CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef,
10077 const FunctionDecl *FnDecl) {
10078 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext();
10079 if (isa<NamespaceDecl>(DC)) {
10080 return SemaRef.Diag(FnDecl->getLocation(),
10081 diag::err_operator_new_delete_declared_in_namespace)
10082 << FnDecl->getDeclName();
10085 if (isa<TranslationUnitDecl>(DC) &&
10086 FnDecl->getStorageClass() == SC_Static) {
10087 return SemaRef.Diag(FnDecl->getLocation(),
10088 diag::err_operator_new_delete_declared_static)
10089 << FnDecl->getDeclName();
10096 CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl,
10097 CanQualType ExpectedResultType,
10098 CanQualType ExpectedFirstParamType,
10099 unsigned DependentParamTypeDiag,
10100 unsigned InvalidParamTypeDiag) {
10101 QualType ResultType =
10102 FnDecl->getType()->getAs<FunctionType>()->getResultType();
10104 // Check that the result type is not dependent.
10105 if (ResultType->isDependentType())
10106 return SemaRef.Diag(FnDecl->getLocation(),
10107 diag::err_operator_new_delete_dependent_result_type)
10108 << FnDecl->getDeclName() << ExpectedResultType;
10110 // Check that the result type is what we expect.
10111 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType)
10112 return SemaRef.Diag(FnDecl->getLocation(),
10113 diag::err_operator_new_delete_invalid_result_type)
10114 << FnDecl->getDeclName() << ExpectedResultType;
10116 // A function template must have at least 2 parameters.
10117 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2)
10118 return SemaRef.Diag(FnDecl->getLocation(),
10119 diag::err_operator_new_delete_template_too_few_parameters)
10120 << FnDecl->getDeclName();
10122 // The function decl must have at least 1 parameter.
10123 if (FnDecl->getNumParams() == 0)
10124 return SemaRef.Diag(FnDecl->getLocation(),
10125 diag::err_operator_new_delete_too_few_parameters)
10126 << FnDecl->getDeclName();
10128 // Check the first parameter type is not dependent.
10129 QualType FirstParamType = FnDecl->getParamDecl(0)->getType();
10130 if (FirstParamType->isDependentType())
10131 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag)
10132 << FnDecl->getDeclName() << ExpectedFirstParamType;
10134 // Check that the first parameter type is what we expect.
10135 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() !=
10136 ExpectedFirstParamType)
10137 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag)
10138 << FnDecl->getDeclName() << ExpectedFirstParamType;
10144 CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
10145 // C++ [basic.stc.dynamic.allocation]p1:
10146 // A program is ill-formed if an allocation function is declared in a
10147 // namespace scope other than global scope or declared static in global
10149 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
10152 CanQualType SizeTy =
10153 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType());
10155 // C++ [basic.stc.dynamic.allocation]p1:
10156 // The return type shall be void*. The first parameter shall have type
10158 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy,
10160 diag::err_operator_new_dependent_param_type,
10161 diag::err_operator_new_param_type))
10164 // C++ [basic.stc.dynamic.allocation]p1:
10165 // The first parameter shall not have an associated default argument.
10166 if (FnDecl->getParamDecl(0)->hasDefaultArg())
10167 return SemaRef.Diag(FnDecl->getLocation(),
10168 diag::err_operator_new_default_arg)
10169 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange();
10175 CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) {
10176 // C++ [basic.stc.dynamic.deallocation]p1:
10177 // A program is ill-formed if deallocation functions are declared in a
10178 // namespace scope other than global scope or declared static in global
10180 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
10183 // C++ [basic.stc.dynamic.deallocation]p2:
10184 // Each deallocation function shall return void and its first parameter
10186 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy,
10187 SemaRef.Context.VoidPtrTy,
10188 diag::err_operator_delete_dependent_param_type,
10189 diag::err_operator_delete_param_type))
10195 /// CheckOverloadedOperatorDeclaration - Check whether the declaration
10196 /// of this overloaded operator is well-formed. If so, returns false;
10197 /// otherwise, emits appropriate diagnostics and returns true.
10198 bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
10199 assert(FnDecl && FnDecl->isOverloadedOperator() &&
10200 "Expected an overloaded operator declaration");
10202 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator();
10204 // C++ [over.oper]p5:
10205 // The allocation and deallocation functions, operator new,
10206 // operator new[], operator delete and operator delete[], are
10207 // described completely in 3.7.3. The attributes and restrictions
10208 // found in the rest of this subclause do not apply to them unless
10209 // explicitly stated in 3.7.3.
10210 if (Op == OO_Delete || Op == OO_Array_Delete)
10211 return CheckOperatorDeleteDeclaration(*this, FnDecl);
10213 if (Op == OO_New || Op == OO_Array_New)
10214 return CheckOperatorNewDeclaration(*this, FnDecl);
10216 // C++ [over.oper]p6:
10217 // An operator function shall either be a non-static member
10218 // function or be a non-member function and have at least one
10219 // parameter whose type is a class, a reference to a class, an
10220 // enumeration, or a reference to an enumeration.
10221 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) {
10222 if (MethodDecl->isStatic())
10223 return Diag(FnDecl->getLocation(),
10224 diag::err_operator_overload_static) << FnDecl->getDeclName();
10226 bool ClassOrEnumParam = false;
10227 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(),
10228 ParamEnd = FnDecl->param_end();
10229 Param != ParamEnd; ++Param) {
10230 QualType ParamType = (*Param)->getType().getNonReferenceType();
10231 if (ParamType->isDependentType() || ParamType->isRecordType() ||
10232 ParamType->isEnumeralType()) {
10233 ClassOrEnumParam = true;
10238 if (!ClassOrEnumParam)
10239 return Diag(FnDecl->getLocation(),
10240 diag::err_operator_overload_needs_class_or_enum)
10241 << FnDecl->getDeclName();
10244 // C++ [over.oper]p8:
10245 // An operator function cannot have default arguments (8.3.6),
10246 // except where explicitly stated below.
10248 // Only the function-call operator allows default arguments
10249 // (C++ [over.call]p1).
10250 if (Op != OO_Call) {
10251 for (FunctionDecl::param_iterator Param = FnDecl->param_begin();
10252 Param != FnDecl->param_end(); ++Param) {
10253 if ((*Param)->hasDefaultArg())
10254 return Diag((*Param)->getLocation(),
10255 diag::err_operator_overload_default_arg)
10256 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange();
10260 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = {
10261 { false, false, false }
10262 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
10263 , { Unary, Binary, MemberOnly }
10264 #include "clang/Basic/OperatorKinds.def"
10267 bool CanBeUnaryOperator = OperatorUses[Op][0];
10268 bool CanBeBinaryOperator = OperatorUses[Op][1];
10269 bool MustBeMemberOperator = OperatorUses[Op][2];
10271 // C++ [over.oper]p8:
10272 // [...] Operator functions cannot have more or fewer parameters
10273 // than the number required for the corresponding operator, as
10274 // described in the rest of this subclause.
10275 unsigned NumParams = FnDecl->getNumParams()
10276 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0);
10277 if (Op != OO_Call &&
10278 ((NumParams == 1 && !CanBeUnaryOperator) ||
10279 (NumParams == 2 && !CanBeBinaryOperator) ||
10280 (NumParams < 1) || (NumParams > 2))) {
10281 // We have the wrong number of parameters.
10282 unsigned ErrorKind;
10283 if (CanBeUnaryOperator && CanBeBinaryOperator) {
10284 ErrorKind = 2; // 2 -> unary or binary.
10285 } else if (CanBeUnaryOperator) {
10286 ErrorKind = 0; // 0 -> unary
10288 assert(CanBeBinaryOperator &&
10289 "All non-call overloaded operators are unary or binary!");
10290 ErrorKind = 1; // 1 -> binary
10293 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be)
10294 << FnDecl->getDeclName() << NumParams << ErrorKind;
10297 // Overloaded operators other than operator() cannot be variadic.
10298 if (Op != OO_Call &&
10299 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) {
10300 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic)
10301 << FnDecl->getDeclName();
10304 // Some operators must be non-static member functions.
10305 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) {
10306 return Diag(FnDecl->getLocation(),
10307 diag::err_operator_overload_must_be_member)
10308 << FnDecl->getDeclName();
10311 // C++ [over.inc]p1:
10312 // The user-defined function called operator++ implements the
10313 // prefix and postfix ++ operator. If this function is a member
10314 // function with no parameters, or a non-member function with one
10315 // parameter of class or enumeration type, it defines the prefix
10316 // increment operator ++ for objects of that type. If the function
10317 // is a member function with one parameter (which shall be of type
10318 // int) or a non-member function with two parameters (the second
10319 // of which shall be of type int), it defines the postfix
10320 // increment operator ++ for objects of that type.
10321 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) {
10322 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1);
10323 bool ParamIsInt = false;
10324 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>())
10325 ParamIsInt = BT->getKind() == BuiltinType::Int;
10328 return Diag(LastParam->getLocation(),
10329 diag::err_operator_overload_post_incdec_must_be_int)
10330 << LastParam->getType() << (Op == OO_MinusMinus);
10336 /// CheckLiteralOperatorDeclaration - Check whether the declaration
10337 /// of this literal operator function is well-formed. If so, returns
10338 /// false; otherwise, emits appropriate diagnostics and returns true.
10339 bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) {
10340 if (isa<CXXMethodDecl>(FnDecl)) {
10341 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace)
10342 << FnDecl->getDeclName();
10346 if (FnDecl->isExternC()) {
10347 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c);
10351 bool Valid = false;
10353 // This might be the definition of a literal operator template.
10354 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate();
10355 // This might be a specialization of a literal operator template.
10357 TpDecl = FnDecl->getPrimaryTemplate();
10359 // template <char...> type operator "" name() is the only valid template
10360 // signature, and the only valid signature with no parameters.
10362 if (FnDecl->param_size() == 0) {
10363 // Must have only one template parameter
10364 TemplateParameterList *Params = TpDecl->getTemplateParameters();
10365 if (Params->size() == 1) {
10366 NonTypeTemplateParmDecl *PmDecl =
10367 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0));
10369 // The template parameter must be a char parameter pack.
10370 if (PmDecl && PmDecl->isTemplateParameterPack() &&
10371 Context.hasSameType(PmDecl->getType(), Context.CharTy))
10375 } else if (FnDecl->param_size()) {
10376 // Check the first parameter
10377 FunctionDecl::param_iterator Param = FnDecl->param_begin();
10379 QualType T = (*Param)->getType().getUnqualifiedType();
10381 // unsigned long long int, long double, and any character type are allowed
10382 // as the only parameters.
10383 if (Context.hasSameType(T, Context.UnsignedLongLongTy) ||
10384 Context.hasSameType(T, Context.LongDoubleTy) ||
10385 Context.hasSameType(T, Context.CharTy) ||
10386 Context.hasSameType(T, Context.WCharTy) ||
10387 Context.hasSameType(T, Context.Char16Ty) ||
10388 Context.hasSameType(T, Context.Char32Ty)) {
10389 if (++Param == FnDecl->param_end())
10391 goto FinishedParams;
10394 // Otherwise it must be a pointer to const; let's strip those qualifiers.
10395 const PointerType *PT = T->getAs<PointerType>();
10397 goto FinishedParams;
10398 T = PT->getPointeeType();
10399 if (!T.isConstQualified() || T.isVolatileQualified())
10400 goto FinishedParams;
10401 T = T.getUnqualifiedType();
10403 // Move on to the second parameter;
10406 // If there is no second parameter, the first must be a const char *
10407 if (Param == FnDecl->param_end()) {
10408 if (Context.hasSameType(T, Context.CharTy))
10410 goto FinishedParams;
10413 // const char *, const wchar_t*, const char16_t*, and const char32_t*
10414 // are allowed as the first parameter to a two-parameter function
10415 if (!(Context.hasSameType(T, Context.CharTy) ||
10416 Context.hasSameType(T, Context.WCharTy) ||
10417 Context.hasSameType(T, Context.Char16Ty) ||
10418 Context.hasSameType(T, Context.Char32Ty)))
10419 goto FinishedParams;
10421 // The second and final parameter must be an std::size_t
10422 T = (*Param)->getType().getUnqualifiedType();
10423 if (Context.hasSameType(T, Context.getSizeType()) &&
10424 ++Param == FnDecl->param_end())
10428 // FIXME: This diagnostic is absolutely terrible.
10431 Diag(FnDecl->getLocation(), diag::err_literal_operator_params)
10432 << FnDecl->getDeclName();
10436 // A parameter-declaration-clause containing a default argument is not
10437 // equivalent to any of the permitted forms.
10438 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(),
10439 ParamEnd = FnDecl->param_end();
10440 Param != ParamEnd; ++Param) {
10441 if ((*Param)->hasDefaultArg()) {
10442 Diag((*Param)->getDefaultArgRange().getBegin(),
10443 diag::err_literal_operator_default_argument)
10444 << (*Param)->getDefaultArgRange();
10449 StringRef LiteralName
10450 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName();
10451 if (LiteralName[0] != '_') {
10452 // C++11 [usrlit.suffix]p1:
10453 // Literal suffix identifiers that do not start with an underscore
10454 // are reserved for future standardization.
10455 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved);
10461 /// ActOnStartLinkageSpecification - Parsed the beginning of a C++
10462 /// linkage specification, including the language and (if present)
10463 /// the '{'. ExternLoc is the location of the 'extern', LangLoc is
10464 /// the location of the language string literal, which is provided
10465 /// by Lang/StrSize. LBraceLoc, if valid, provides the location of
10466 /// the '{' brace. Otherwise, this linkage specification does not
10467 /// have any braces.
10468 Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc,
10469 SourceLocation LangLoc,
10471 SourceLocation LBraceLoc) {
10472 LinkageSpecDecl::LanguageIDs Language;
10473 if (Lang == "\"C\"")
10474 Language = LinkageSpecDecl::lang_c;
10475 else if (Lang == "\"C++\"")
10476 Language = LinkageSpecDecl::lang_cxx;
10478 Diag(LangLoc, diag::err_bad_language);
10482 // FIXME: Add all the various semantics of linkage specifications
10484 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext,
10485 ExternLoc, LangLoc, Language,
10486 LBraceLoc.isValid());
10487 CurContext->addDecl(D);
10488 PushDeclContext(S, D);
10492 /// ActOnFinishLinkageSpecification - Complete the definition of
10493 /// the C++ linkage specification LinkageSpec. If RBraceLoc is
10494 /// valid, it's the position of the closing '}' brace in a linkage
10495 /// specification that uses braces.
10496 Decl *Sema::ActOnFinishLinkageSpecification(Scope *S,
10498 SourceLocation RBraceLoc) {
10500 if (RBraceLoc.isValid()) {
10501 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec);
10502 LSDecl->setRBraceLoc(RBraceLoc);
10506 return LinkageSpec;
10509 Decl *Sema::ActOnEmptyDeclaration(Scope *S,
10510 AttributeList *AttrList,
10511 SourceLocation SemiLoc) {
10512 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc);
10513 // Attribute declarations appertain to empty declaration so we handle
10516 ProcessDeclAttributeList(S, ED, AttrList);
10518 CurContext->addDecl(ED);
10522 /// \brief Perform semantic analysis for the variable declaration that
10523 /// occurs within a C++ catch clause, returning the newly-created
10525 VarDecl *Sema::BuildExceptionDeclaration(Scope *S,
10526 TypeSourceInfo *TInfo,
10527 SourceLocation StartLoc,
10528 SourceLocation Loc,
10529 IdentifierInfo *Name) {
10530 bool Invalid = false;
10531 QualType ExDeclType = TInfo->getType();
10533 // Arrays and functions decay.
10534 if (ExDeclType->isArrayType())
10535 ExDeclType = Context.getArrayDecayedType(ExDeclType);
10536 else if (ExDeclType->isFunctionType())
10537 ExDeclType = Context.getPointerType(ExDeclType);
10539 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type.
10540 // The exception-declaration shall not denote a pointer or reference to an
10541 // incomplete type, other than [cv] void*.
10542 // N2844 forbids rvalue references.
10543 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) {
10544 Diag(Loc, diag::err_catch_rvalue_ref);
10548 QualType BaseType = ExDeclType;
10549 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference
10550 unsigned DK = diag::err_catch_incomplete;
10551 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
10552 BaseType = Ptr->getPointeeType();
10554 DK = diag::err_catch_incomplete_ptr;
10555 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) {
10556 // For the purpose of error recovery, we treat rvalue refs like lvalue refs.
10557 BaseType = Ref->getPointeeType();
10559 DK = diag::err_catch_incomplete_ref;
10561 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) &&
10562 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK))
10565 if (!Invalid && !ExDeclType->isDependentType() &&
10566 RequireNonAbstractType(Loc, ExDeclType,
10567 diag::err_abstract_type_in_decl,
10568 AbstractVariableType))
10571 // Only the non-fragile NeXT runtime currently supports C++ catches
10572 // of ObjC types, and no runtime supports catching ObjC types by value.
10573 if (!Invalid && getLangOpts().ObjC1) {
10574 QualType T = ExDeclType;
10575 if (const ReferenceType *RT = T->getAs<ReferenceType>())
10576 T = RT->getPointeeType();
10578 if (T->isObjCObjectType()) {
10579 Diag(Loc, diag::err_objc_object_catch);
10581 } else if (T->isObjCObjectPointerType()) {
10582 // FIXME: should this be a test for macosx-fragile specifically?
10583 if (getLangOpts().ObjCRuntime.isFragile())
10584 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile);
10588 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name,
10589 ExDeclType, TInfo, SC_None);
10590 ExDecl->setExceptionVariable(true);
10592 // In ARC, infer 'retaining' for variables of retainable type.
10593 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl))
10596 if (!Invalid && !ExDeclType->isDependentType()) {
10597 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) {
10598 // Insulate this from anything else we might currently be parsing.
10599 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated);
10601 // C++ [except.handle]p16:
10602 // The object declared in an exception-declaration or, if the
10603 // exception-declaration does not specify a name, a temporary (12.2) is
10604 // copy-initialized (8.5) from the exception object. [...]
10605 // The object is destroyed when the handler exits, after the destruction
10606 // of any automatic objects initialized within the handler.
10608 // We just pretend to initialize the object with itself, then make sure
10609 // it can be destroyed later.
10610 QualType initType = ExDeclType;
10612 InitializedEntity entity =
10613 InitializedEntity::InitializeVariable(ExDecl);
10614 InitializationKind initKind =
10615 InitializationKind::CreateCopy(Loc, SourceLocation());
10617 Expr *opaqueValue =
10618 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary);
10619 InitializationSequence sequence(*this, entity, initKind, opaqueValue);
10620 ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue);
10621 if (result.isInvalid())
10624 // If the constructor used was non-trivial, set this as the
10626 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take());
10627 if (!construct->getConstructor()->isTrivial()) {
10628 Expr *init = MaybeCreateExprWithCleanups(construct);
10629 ExDecl->setInit(init);
10632 // And make sure it's destructable.
10633 FinalizeVarWithDestructor(ExDecl, recordType);
10639 ExDecl->setInvalidDecl();
10644 /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
10646 Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
10647 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
10648 bool Invalid = D.isInvalidType();
10650 // Check for unexpanded parameter packs.
10651 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
10652 UPPC_ExceptionType)) {
10653 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
10654 D.getIdentifierLoc());
10658 IdentifierInfo *II = D.getIdentifier();
10659 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(),
10660 LookupOrdinaryName,
10661 ForRedeclaration)) {
10662 // The scope should be freshly made just for us. There is just no way
10663 // it contains any previous declaration.
10664 assert(!S->isDeclScope(PrevDecl));
10665 if (PrevDecl->isTemplateParameter()) {
10666 // Maybe we will complain about the shadowed template parameter.
10667 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
10672 if (D.getCXXScopeSpec().isSet() && !Invalid) {
10673 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator)
10674 << D.getCXXScopeSpec().getRange();
10678 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo,
10680 D.getIdentifierLoc(),
10681 D.getIdentifier());
10683 ExDecl->setInvalidDecl();
10685 // Add the exception declaration into this scope.
10687 PushOnScopeChains(ExDecl, S);
10689 CurContext->addDecl(ExDecl);
10691 ProcessDeclAttributes(S, ExDecl, D);
10695 Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc,
10697 Expr *AssertMessageExpr,
10698 SourceLocation RParenLoc) {
10699 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr);
10701 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression))
10704 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr,
10705 AssertMessage, RParenLoc, false);
10708 Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc,
10710 StringLiteral *AssertMessage,
10711 SourceLocation RParenLoc,
10713 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() &&
10715 // In a static_assert-declaration, the constant-expression shall be a
10716 // constant expression that can be contextually converted to bool.
10717 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr);
10718 if (Converted.isInvalid())
10722 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond,
10723 diag::err_static_assert_expression_is_not_constant,
10724 /*AllowFold=*/false).isInvalid())
10727 if (!Failed && !Cond) {
10728 SmallString<256> MsgBuffer;
10729 llvm::raw_svector_ostream Msg(MsgBuffer);
10730 AssertMessage->printPretty(Msg, 0, getPrintingPolicy());
10731 Diag(StaticAssertLoc, diag::err_static_assert_failed)
10732 << Msg.str() << AssertExpr->getSourceRange();
10737 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc,
10738 AssertExpr, AssertMessage, RParenLoc,
10741 CurContext->addDecl(Decl);
10745 /// \brief Perform semantic analysis of the given friend type declaration.
10747 /// \returns A friend declaration that.
10748 FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart,
10749 SourceLocation FriendLoc,
10750 TypeSourceInfo *TSInfo) {
10751 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration");
10753 QualType T = TSInfo->getType();
10754 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange();
10756 // C++03 [class.friend]p2:
10757 // An elaborated-type-specifier shall be used in a friend declaration
10760 // * The class-key of the elaborated-type-specifier is required.
10761 if (!ActiveTemplateInstantiations.empty()) {
10762 // Do not complain about the form of friend template types during
10763 // template instantiation; we will already have complained when the
10764 // template was declared.
10766 if (!T->isElaboratedTypeSpecifier()) {
10767 // If we evaluated the type to a record type, suggest putting
10769 if (const RecordType *RT = T->getAs<RecordType>()) {
10770 RecordDecl *RD = RT->getDecl();
10772 std::string InsertionText = std::string(" ") + RD->getKindName();
10774 Diag(TypeRange.getBegin(),
10775 getLangOpts().CPlusPlus11 ?
10776 diag::warn_cxx98_compat_unelaborated_friend_type :
10777 diag::ext_unelaborated_friend_type)
10778 << (unsigned) RD->getTagKind()
10780 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc),
10784 getLangOpts().CPlusPlus11 ?
10785 diag::warn_cxx98_compat_nonclass_type_friend :
10786 diag::ext_nonclass_type_friend)
10790 } else if (T->getAs<EnumType>()) {
10792 getLangOpts().CPlusPlus11 ?
10793 diag::warn_cxx98_compat_enum_friend :
10794 diag::ext_enum_friend)
10799 // C++11 [class.friend]p3:
10800 // A friend declaration that does not declare a function shall have one
10801 // of the following forms:
10802 // friend elaborated-type-specifier ;
10803 // friend simple-type-specifier ;
10804 // friend typename-specifier ;
10805 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc)
10806 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T;
10809 // If the type specifier in a friend declaration designates a (possibly
10810 // cv-qualified) class type, that class is declared as a friend; otherwise,
10811 // the friend declaration is ignored.
10812 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc);
10815 /// Handle a friend tag declaration where the scope specifier was
10817 Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc,
10818 unsigned TagSpec, SourceLocation TagLoc,
10820 IdentifierInfo *Name,
10821 SourceLocation NameLoc,
10822 AttributeList *Attr,
10823 MultiTemplateParamsArg TempParamLists) {
10824 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
10826 bool isExplicitSpecialization = false;
10827 bool Invalid = false;
10829 if (TemplateParameterList *TemplateParams
10830 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS,
10831 TempParamLists.data(),
10832 TempParamLists.size(),
10834 isExplicitSpecialization,
10836 if (TemplateParams->size() > 0) {
10837 // This is a declaration of a class template.
10841 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc,
10842 SS, Name, NameLoc, Attr,
10843 TemplateParams, AS_public,
10844 /*ModulePrivateLoc=*/SourceLocation(),
10845 TempParamLists.size() - 1,
10846 TempParamLists.data()).take();
10848 // The "template<>" header is extraneous.
10849 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
10850 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
10851 isExplicitSpecialization = true;
10855 if (Invalid) return 0;
10857 bool isAllExplicitSpecializations = true;
10858 for (unsigned I = TempParamLists.size(); I-- > 0; ) {
10859 if (TempParamLists[I]->size()) {
10860 isAllExplicitSpecializations = false;
10865 // FIXME: don't ignore attributes.
10867 // If it's explicit specializations all the way down, just forget
10868 // about the template header and build an appropriate non-templated
10869 // friend. TODO: for source fidelity, remember the headers.
10870 if (isAllExplicitSpecializations) {
10871 if (SS.isEmpty()) {
10872 bool Owned = false;
10873 bool IsDependent = false;
10874 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc,
10876 /*ModulePrivateLoc=*/SourceLocation(),
10877 MultiTemplateParamsArg(), Owned, IsDependent,
10878 /*ScopedEnumKWLoc=*/SourceLocation(),
10879 /*ScopedEnumUsesClassTag=*/false,
10880 /*UnderlyingType=*/TypeResult());
10883 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
10884 ElaboratedTypeKeyword Keyword
10885 = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
10886 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc,
10891 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
10892 if (isa<DependentNameType>(T)) {
10893 DependentNameTypeLoc TL =
10894 TSI->getTypeLoc().castAs<DependentNameTypeLoc>();
10895 TL.setElaboratedKeywordLoc(TagLoc);
10896 TL.setQualifierLoc(QualifierLoc);
10897 TL.setNameLoc(NameLoc);
10899 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>();
10900 TL.setElaboratedKeywordLoc(TagLoc);
10901 TL.setQualifierLoc(QualifierLoc);
10902 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc);
10905 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
10906 TSI, FriendLoc, TempParamLists);
10907 Friend->setAccess(AS_public);
10908 CurContext->addDecl(Friend);
10912 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?");
10916 // Handle the case of a templated-scope friend class. e.g.
10917 // template <class T> class A<T>::B;
10918 // FIXME: we don't support these right now.
10919 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
10920 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name);
10921 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
10922 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>();
10923 TL.setElaboratedKeywordLoc(TagLoc);
10924 TL.setQualifierLoc(SS.getWithLocInContext(Context));
10925 TL.setNameLoc(NameLoc);
10927 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
10928 TSI, FriendLoc, TempParamLists);
10929 Friend->setAccess(AS_public);
10930 Friend->setUnsupportedFriend(true);
10931 CurContext->addDecl(Friend);
10936 /// Handle a friend type declaration. This works in tandem with
10939 /// Notes on friend class templates:
10941 /// We generally treat friend class declarations as if they were
10942 /// declaring a class. So, for example, the elaborated type specifier
10943 /// in a friend declaration is required to obey the restrictions of a
10944 /// class-head (i.e. no typedefs in the scope chain), template
10945 /// parameters are required to match up with simple template-ids, &c.
10946 /// However, unlike when declaring a template specialization, it's
10947 /// okay to refer to a template specialization without an empty
10948 /// template parameter declaration, e.g.
10949 /// friend class A<T>::B<unsigned>;
10950 /// We permit this as a special case; if there are any template
10951 /// parameters present at all, require proper matching, i.e.
10952 /// template <> template \<class T> friend class A<int>::B;
10953 Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
10954 MultiTemplateParamsArg TempParams) {
10955 SourceLocation Loc = DS.getLocStart();
10957 assert(DS.isFriendSpecified());
10958 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
10960 // Try to convert the decl specifier to a type. This works for
10961 // friend templates because ActOnTag never produces a ClassTemplateDecl
10962 // for a TUK_Friend.
10963 Declarator TheDeclarator(DS, Declarator::MemberContext);
10964 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S);
10965 QualType T = TSI->getType();
10966 if (TheDeclarator.isInvalidType())
10969 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration))
10972 // This is definitely an error in C++98. It's probably meant to
10973 // be forbidden in C++0x, too, but the specification is just
10976 // The problem is with declarations like the following:
10977 // template <T> friend A<T>::foo;
10978 // where deciding whether a class C is a friend or not now hinges
10979 // on whether there exists an instantiation of A that causes
10980 // 'foo' to equal C. There are restrictions on class-heads
10981 // (which we declare (by fiat) elaborated friend declarations to
10982 // be) that makes this tractable.
10984 // FIXME: handle "template <> friend class A<T>;", which
10985 // is possibly well-formed? Who even knows?
10986 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) {
10987 Diag(Loc, diag::err_tagless_friend_type_template)
10988 << DS.getSourceRange();
10992 // C++98 [class.friend]p1: A friend of a class is a function
10993 // or class that is not a member of the class . . .
10994 // This is fixed in DR77, which just barely didn't make the C++03
10995 // deadline. It's also a very silly restriction that seriously
10996 // affects inner classes and which nobody else seems to implement;
10997 // thus we never diagnose it, not even in -pedantic.
10999 // But note that we could warn about it: it's always useless to
11000 // friend one of your own members (it's not, however, worthless to
11001 // friend a member of an arbitrary specialization of your template).
11004 if (unsigned NumTempParamLists = TempParams.size())
11005 D = FriendTemplateDecl::Create(Context, CurContext, Loc,
11009 DS.getFriendSpecLoc());
11011 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI);
11016 D->setAccess(AS_public);
11017 CurContext->addDecl(D);
11022 NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D,
11023 MultiTemplateParamsArg TemplateParams) {
11024 const DeclSpec &DS = D.getDeclSpec();
11026 assert(DS.isFriendSpecified());
11027 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
11029 SourceLocation Loc = D.getIdentifierLoc();
11030 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
11032 // C++ [class.friend]p1
11033 // A friend of a class is a function or class....
11034 // Note that this sees through typedefs, which is intended.
11035 // It *doesn't* see through dependent types, which is correct
11036 // according to [temp.arg.type]p3:
11037 // If a declaration acquires a function type through a
11038 // type dependent on a template-parameter and this causes
11039 // a declaration that does not use the syntactic form of a
11040 // function declarator to have a function type, the program
11042 if (!TInfo->getType()->isFunctionType()) {
11043 Diag(Loc, diag::err_unexpected_friend);
11045 // It might be worthwhile to try to recover by creating an
11046 // appropriate declaration.
11050 // C++ [namespace.memdef]p3
11051 // - If a friend declaration in a non-local class first declares a
11052 // class or function, the friend class or function is a member
11053 // of the innermost enclosing namespace.
11054 // - The name of the friend is not found by simple name lookup
11055 // until a matching declaration is provided in that namespace
11056 // scope (either before or after the class declaration granting
11058 // - If a friend function is called, its name may be found by the
11059 // name lookup that considers functions from namespaces and
11060 // classes associated with the types of the function arguments.
11061 // - When looking for a prior declaration of a class or a function
11062 // declared as a friend, scopes outside the innermost enclosing
11063 // namespace scope are not considered.
11065 CXXScopeSpec &SS = D.getCXXScopeSpec();
11066 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
11067 DeclarationName Name = NameInfo.getName();
11070 // Check for unexpanded parameter packs.
11071 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) ||
11072 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) ||
11073 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration))
11076 // The context we found the declaration in, or in which we should
11077 // create the declaration.
11079 Scope *DCScope = S;
11080 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
11083 // FIXME: there are different rules in local classes
11085 // There are four cases here.
11086 // - There's no scope specifier, in which case we just go to the
11087 // appropriate scope and look for a function or function template
11088 // there as appropriate.
11089 // Recover from invalid scope qualifiers as if they just weren't there.
11090 if (SS.isInvalid() || !SS.isSet()) {
11091 // C++0x [namespace.memdef]p3:
11092 // If the name in a friend declaration is neither qualified nor
11093 // a template-id and the declaration is a function or an
11094 // elaborated-type-specifier, the lookup to determine whether
11095 // the entity has been previously declared shall not consider
11096 // any scopes outside the innermost enclosing namespace.
11097 // C++0x [class.friend]p11:
11098 // If a friend declaration appears in a local class and the name
11099 // specified is an unqualified name, a prior declaration is
11100 // looked up without considering scopes that are outside the
11101 // innermost enclosing non-class scope. For a friend function
11102 // declaration, if there is no prior declaration, the program is
11104 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass();
11105 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId;
11107 // Find the appropriate context according to the above.
11110 // Skip class contexts. If someone can cite chapter and verse
11111 // for this behavior, that would be nice --- it's what GCC and
11112 // EDG do, and it seems like a reasonable intent, but the spec
11113 // really only says that checks for unqualified existing
11114 // declarations should stop at the nearest enclosing namespace,
11115 // not that they should only consider the nearest enclosing
11117 while (DC->isRecord())
11118 DC = DC->getParent();
11120 DeclContext *LookupDC = DC;
11121 while (LookupDC->isTransparentContext())
11122 LookupDC = LookupDC->getParent();
11125 LookupQualifiedName(Previous, LookupDC);
11127 // TODO: decide what we think about using declarations.
11131 if (!Previous.empty()) {
11136 if (isTemplateId) {
11137 if (isa<TranslationUnitDecl>(LookupDC)) break;
11139 if (LookupDC->isFileContext()) break;
11141 LookupDC = LookupDC->getParent();
11144 DCScope = getScopeForDeclContext(S, DC);
11146 // C++ [class.friend]p6:
11147 // A function can be defined in a friend declaration of a class if and
11148 // only if the class is a non-local class (9.8), the function name is
11149 // unqualified, and the function has namespace scope.
11150 if (isLocal && D.isFunctionDefinition()) {
11151 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class);
11154 // - There's a non-dependent scope specifier, in which case we
11155 // compute it and do a previous lookup there for a function
11156 // or function template.
11157 } else if (!SS.getScopeRep()->isDependent()) {
11158 DC = computeDeclContext(SS);
11161 if (RequireCompleteDeclContext(SS, DC)) return 0;
11163 LookupQualifiedName(Previous, DC);
11165 // Ignore things found implicitly in the wrong scope.
11166 // TODO: better diagnostics for this case. Suggesting the right
11167 // qualified scope would be nice...
11168 LookupResult::Filter F = Previous.makeFilter();
11169 while (F.hasNext()) {
11170 NamedDecl *D = F.next();
11171 if (!DC->InEnclosingNamespaceSetOf(
11172 D->getDeclContext()->getRedeclContext()))
11177 if (Previous.empty()) {
11178 D.setInvalidType();
11179 Diag(Loc, diag::err_qualified_friend_not_found)
11180 << Name << TInfo->getType();
11184 // C++ [class.friend]p1: A friend of a class is a function or
11185 // class that is not a member of the class . . .
11186 if (DC->Equals(CurContext))
11187 Diag(DS.getFriendSpecLoc(),
11188 getLangOpts().CPlusPlus11 ?
11189 diag::warn_cxx98_compat_friend_is_member :
11190 diag::err_friend_is_member);
11192 if (D.isFunctionDefinition()) {
11193 // C++ [class.friend]p6:
11194 // A function can be defined in a friend declaration of a class if and
11195 // only if the class is a non-local class (9.8), the function name is
11196 // unqualified, and the function has namespace scope.
11197 SemaDiagnosticBuilder DB
11198 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def);
11200 DB << SS.getScopeRep();
11201 if (DC->isFileContext())
11202 DB << FixItHint::CreateRemoval(SS.getRange());
11206 // - There's a scope specifier that does not match any template
11207 // parameter lists, in which case we use some arbitrary context,
11208 // create a method or method template, and wait for instantiation.
11209 // - There's a scope specifier that does match some template
11210 // parameter lists, which we don't handle right now.
11212 if (D.isFunctionDefinition()) {
11213 // C++ [class.friend]p6:
11214 // A function can be defined in a friend declaration of a class if and
11215 // only if the class is a non-local class (9.8), the function name is
11216 // unqualified, and the function has namespace scope.
11217 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def)
11218 << SS.getScopeRep();
11222 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?");
11225 if (!DC->isRecord()) {
11226 // This implies that it has to be an operator or function.
11227 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ||
11228 D.getName().getKind() == UnqualifiedId::IK_DestructorName ||
11229 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) {
11230 Diag(Loc, diag::err_introducing_special_friend) <<
11231 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 :
11232 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2);
11237 // FIXME: This is an egregious hack to cope with cases where the scope stack
11238 // does not contain the declaration context, i.e., in an out-of-line
11239 // definition of a class.
11240 Scope FakeDCScope(S, Scope::DeclScope, Diags);
11242 FakeDCScope.setEntity(DC);
11243 DCScope = &FakeDCScope;
11246 bool AddToScope = true;
11247 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous,
11248 TemplateParams, AddToScope);
11251 assert(ND->getDeclContext() == DC);
11252 assert(ND->getLexicalDeclContext() == CurContext);
11254 // Add the function declaration to the appropriate lookup tables,
11255 // adjusting the redeclarations list as necessary. We don't
11256 // want to do this yet if the friending class is dependent.
11258 // Also update the scope-based lookup if the target context's
11259 // lookup context is in lexical scope.
11260 if (!CurContext->isDependentContext()) {
11261 DC = DC->getRedeclContext();
11262 DC->makeDeclVisibleInContext(ND);
11263 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
11264 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false);
11267 FriendDecl *FrD = FriendDecl::Create(Context, CurContext,
11268 D.getIdentifierLoc(), ND,
11269 DS.getFriendSpecLoc());
11270 FrD->setAccess(AS_public);
11271 CurContext->addDecl(FrD);
11273 if (ND->isInvalidDecl()) {
11274 FrD->setInvalidDecl();
11276 if (DC->isRecord()) CheckFriendAccess(ND);
11279 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND))
11280 FD = FTD->getTemplatedDecl();
11282 FD = cast<FunctionDecl>(ND);
11284 // Mark templated-scope function declarations as unsupported.
11285 if (FD->getNumTemplateParameterLists())
11286 FrD->setUnsupportedFriend(true);
11292 void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) {
11293 AdjustDeclIfTemplate(Dcl);
11295 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl);
11297 Diag(DelLoc, diag::err_deleted_non_function);
11301 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) {
11302 // Don't consider the implicit declaration we generate for explicit
11303 // specializations. FIXME: Do not generate these implicit declarations.
11304 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization
11305 || Prev->getPreviousDecl()) && !Prev->isDefined()) {
11306 Diag(DelLoc, diag::err_deleted_decl_not_first);
11307 Diag(Prev->getLocation(), diag::note_previous_declaration);
11309 // If the declaration wasn't the first, we delete the function anyway for
11311 Fn = Fn->getCanonicalDecl();
11314 if (Fn->isDeleted())
11317 // See if we're deleting a function which is already known to override a
11318 // non-deleted virtual function.
11319 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) {
11320 bool IssuedDiagnostic = false;
11321 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
11322 E = MD->end_overridden_methods();
11324 if (!(*MD->begin_overridden_methods())->isDeleted()) {
11325 if (!IssuedDiagnostic) {
11326 Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName();
11327 IssuedDiagnostic = true;
11329 Diag((*I)->getLocation(), diag::note_overridden_virtual_function);
11334 Fn->setDeletedAsWritten();
11337 void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) {
11338 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl);
11341 if (MD->getParent()->isDependentType()) {
11342 MD->setDefaulted();
11343 MD->setExplicitlyDefaulted();
11347 CXXSpecialMember Member = getSpecialMember(MD);
11348 if (Member == CXXInvalid) {
11349 Diag(DefaultLoc, diag::err_default_special_members);
11353 MD->setDefaulted();
11354 MD->setExplicitlyDefaulted();
11356 // If this definition appears within the record, do the checking when
11357 // the record is complete.
11358 const FunctionDecl *Primary = MD;
11359 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern())
11360 // Find the uninstantiated declaration that actually had the '= default'
11362 Pattern->isDefined(Primary);
11364 // If the method was defaulted on its first declaration, we will have
11365 // already performed the checking in CheckCompletedCXXClass. Such a
11366 // declaration doesn't trigger an implicit definition.
11367 if (Primary == Primary->getCanonicalDecl())
11370 CheckExplicitlyDefaultedSpecialMember(MD);
11372 // The exception specification is needed because we are defining the
11374 ResolveExceptionSpec(DefaultLoc,
11375 MD->getType()->castAs<FunctionProtoType>());
11378 case CXXDefaultConstructor: {
11379 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD);
11380 if (!CD->isInvalidDecl())
11381 DefineImplicitDefaultConstructor(DefaultLoc, CD);
11385 case CXXCopyConstructor: {
11386 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD);
11387 if (!CD->isInvalidDecl())
11388 DefineImplicitCopyConstructor(DefaultLoc, CD);
11392 case CXXCopyAssignment: {
11393 if (!MD->isInvalidDecl())
11394 DefineImplicitCopyAssignment(DefaultLoc, MD);
11398 case CXXDestructor: {
11399 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD);
11400 if (!DD->isInvalidDecl())
11401 DefineImplicitDestructor(DefaultLoc, DD);
11405 case CXXMoveConstructor: {
11406 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD);
11407 if (!CD->isInvalidDecl())
11408 DefineImplicitMoveConstructor(DefaultLoc, CD);
11412 case CXXMoveAssignment: {
11413 if (!MD->isInvalidDecl())
11414 DefineImplicitMoveAssignment(DefaultLoc, MD);
11419 llvm_unreachable("Invalid special member.");
11422 Diag(DefaultLoc, diag::err_default_special_members);
11426 static void SearchForReturnInStmt(Sema &Self, Stmt *S) {
11427 for (Stmt::child_range CI = S->children(); CI; ++CI) {
11428 Stmt *SubStmt = *CI;
11431 if (isa<ReturnStmt>(SubStmt))
11432 Self.Diag(SubStmt->getLocStart(),
11433 diag::err_return_in_constructor_handler);
11434 if (!isa<Expr>(SubStmt))
11435 SearchForReturnInStmt(Self, SubStmt);
11439 void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) {
11440 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) {
11441 CXXCatchStmt *Handler = TryBlock->getHandler(I);
11442 SearchForReturnInStmt(*this, Handler);
11446 bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New,
11447 const CXXMethodDecl *Old) {
11448 const FunctionType *NewFT = New->getType()->getAs<FunctionType>();
11449 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>();
11451 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv();
11453 // If the calling conventions match, everything is fine
11454 if (NewCC == OldCC)
11457 // If either of the calling conventions are set to "default", we need to pick
11458 // something more sensible based on the target. This supports code where the
11459 // one method explicitly sets thiscall, and another has no explicit calling
11461 CallingConv Default =
11462 Context.getTargetInfo().getDefaultCallingConv(TargetInfo::CCMT_Member);
11463 if (NewCC == CC_Default)
11465 if (OldCC == CC_Default)
11468 // If the calling conventions still don't match, then report the error
11469 if (NewCC != OldCC) {
11470 Diag(New->getLocation(),
11471 diag::err_conflicting_overriding_cc_attributes)
11472 << New->getDeclName() << New->getType() << Old->getType();
11473 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
11480 bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
11481 const CXXMethodDecl *Old) {
11482 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType();
11483 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType();
11485 if (Context.hasSameType(NewTy, OldTy) ||
11486 NewTy->isDependentType() || OldTy->isDependentType())
11489 // Check if the return types are covariant
11490 QualType NewClassTy, OldClassTy;
11492 /// Both types must be pointers or references to classes.
11493 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) {
11494 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) {
11495 NewClassTy = NewPT->getPointeeType();
11496 OldClassTy = OldPT->getPointeeType();
11498 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) {
11499 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) {
11500 if (NewRT->getTypeClass() == OldRT->getTypeClass()) {
11501 NewClassTy = NewRT->getPointeeType();
11502 OldClassTy = OldRT->getPointeeType();
11507 // The return types aren't either both pointers or references to a class type.
11508 if (NewClassTy.isNull()) {
11509 Diag(New->getLocation(),
11510 diag::err_different_return_type_for_overriding_virtual_function)
11511 << New->getDeclName() << NewTy << OldTy;
11512 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
11517 // C++ [class.virtual]p6:
11518 // If the return type of D::f differs from the return type of B::f, the
11519 // class type in the return type of D::f shall be complete at the point of
11520 // declaration of D::f or shall be the class type D.
11521 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) {
11522 if (!RT->isBeingDefined() &&
11523 RequireCompleteType(New->getLocation(), NewClassTy,
11524 diag::err_covariant_return_incomplete,
11525 New->getDeclName()))
11529 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) {
11530 // Check if the new class derives from the old class.
11531 if (!IsDerivedFrom(NewClassTy, OldClassTy)) {
11532 Diag(New->getLocation(),
11533 diag::err_covariant_return_not_derived)
11534 << New->getDeclName() << NewTy << OldTy;
11535 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
11539 // Check if we the conversion from derived to base is valid.
11540 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy,
11541 diag::err_covariant_return_inaccessible_base,
11542 diag::err_covariant_return_ambiguous_derived_to_base_conv,
11543 // FIXME: Should this point to the return type?
11544 New->getLocation(), SourceRange(), New->getDeclName(), 0)) {
11545 // FIXME: this note won't trigger for delayed access control
11546 // diagnostics, and it's impossible to get an undelayed error
11547 // here from access control during the original parse because
11548 // the ParsingDeclSpec/ParsingDeclarator are still in scope.
11549 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
11554 // The qualifiers of the return types must be the same.
11555 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) {
11556 Diag(New->getLocation(),
11557 diag::err_covariant_return_type_different_qualifications)
11558 << New->getDeclName() << NewTy << OldTy;
11559 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
11564 // The new class type must have the same or less qualifiers as the old type.
11565 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) {
11566 Diag(New->getLocation(),
11567 diag::err_covariant_return_type_class_type_more_qualified)
11568 << New->getDeclName() << NewTy << OldTy;
11569 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
11576 /// \brief Mark the given method pure.
11578 /// \param Method the method to be marked pure.
11580 /// \param InitRange the source range that covers the "0" initializer.
11581 bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) {
11582 SourceLocation EndLoc = InitRange.getEnd();
11583 if (EndLoc.isValid())
11584 Method->setRangeEnd(EndLoc);
11586 if (Method->isVirtual() || Method->getParent()->isDependentContext()) {
11591 if (!Method->isInvalidDecl())
11592 Diag(Method->getLocation(), diag::err_non_virtual_pure)
11593 << Method->getDeclName() << InitRange;
11597 /// \brief Determine whether the given declaration is a static data member.
11598 static bool isStaticDataMember(Decl *D) {
11599 VarDecl *Var = dyn_cast_or_null<VarDecl>(D);
11603 return Var->isStaticDataMember();
11605 /// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse
11606 /// an initializer for the out-of-line declaration 'Dcl'. The scope
11607 /// is a fresh scope pushed for just this purpose.
11609 /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
11610 /// static data member of class X, names should be looked up in the scope of
11612 void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) {
11613 // If there is no declaration, there was an error parsing it.
11614 if (D == 0 || D->isInvalidDecl()) return;
11616 // We should only get called for declarations with scope specifiers, like:
11618 assert(D->isOutOfLine());
11619 EnterDeclaratorContext(S, D->getDeclContext());
11621 // If we are parsing the initializer for a static data member, push a
11622 // new expression evaluation context that is associated with this static
11624 if (isStaticDataMember(D))
11625 PushExpressionEvaluationContext(PotentiallyEvaluated, D);
11628 /// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an
11629 /// initializer for the out-of-line declaration 'D'.
11630 void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) {
11631 // If there is no declaration, there was an error parsing it.
11632 if (D == 0 || D->isInvalidDecl()) return;
11634 if (isStaticDataMember(D))
11635 PopExpressionEvaluationContext();
11637 assert(D->isOutOfLine());
11638 ExitDeclaratorContext(S);
11641 /// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a
11642 /// C++ if/switch/while/for statement.
11643 /// e.g: "if (int x = f()) {...}"
11644 DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) {
11646 // The declarator shall not specify a function or an array.
11647 // The type-specifier-seq shall not contain typedef and shall not declare a
11648 // new class or enumeration.
11649 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
11650 "Parser allowed 'typedef' as storage class of condition decl.");
11652 Decl *Dcl = ActOnDeclarator(S, D);
11656 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function.
11657 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type)
11658 << D.getSourceRange();
11665 void Sema::LoadExternalVTableUses() {
11666 if (!ExternalSource)
11669 SmallVector<ExternalVTableUse, 4> VTables;
11670 ExternalSource->ReadUsedVTables(VTables);
11671 SmallVector<VTableUse, 4> NewUses;
11672 for (unsigned I = 0, N = VTables.size(); I != N; ++I) {
11673 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos
11674 = VTablesUsed.find(VTables[I].Record);
11675 // Even if a definition wasn't required before, it may be required now.
11676 if (Pos != VTablesUsed.end()) {
11677 if (!Pos->second && VTables[I].DefinitionRequired)
11678 Pos->second = true;
11682 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired;
11683 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location));
11686 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end());
11689 void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class,
11690 bool DefinitionRequired) {
11691 // Ignore any vtable uses in unevaluated operands or for classes that do
11692 // not have a vtable.
11693 if (!Class->isDynamicClass() || Class->isDependentContext() ||
11694 CurContext->isDependentContext() || isUnevaluatedContext())
11697 // Try to insert this class into the map.
11698 LoadExternalVTableUses();
11699 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl());
11700 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool>
11701 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired));
11703 // If we already had an entry, check to see if we are promoting this vtable
11704 // to required a definition. If so, we need to reappend to the VTableUses
11705 // list, since we may have already processed the first entry.
11706 if (DefinitionRequired && !Pos.first->second) {
11707 Pos.first->second = true;
11709 // Otherwise, we can early exit.
11714 // Local classes need to have their virtual members marked
11715 // immediately. For all other classes, we mark their virtual members
11716 // at the end of the translation unit.
11717 if (Class->isLocalClass())
11718 MarkVirtualMembersReferenced(Loc, Class);
11720 VTableUses.push_back(std::make_pair(Class, Loc));
11723 bool Sema::DefineUsedVTables() {
11724 LoadExternalVTableUses();
11725 if (VTableUses.empty())
11728 // Note: The VTableUses vector could grow as a result of marking
11729 // the members of a class as "used", so we check the size each
11730 // time through the loop and prefer indices (which are stable) to
11731 // iterators (which are not).
11732 bool DefinedAnything = false;
11733 for (unsigned I = 0; I != VTableUses.size(); ++I) {
11734 CXXRecordDecl *Class = VTableUses[I].first->getDefinition();
11738 SourceLocation Loc = VTableUses[I].second;
11740 bool DefineVTable = true;
11742 // If this class has a key function, but that key function is
11743 // defined in another translation unit, we don't need to emit the
11744 // vtable even though we're using it.
11745 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class);
11746 if (KeyFunction && !KeyFunction->hasBody()) {
11747 switch (KeyFunction->getTemplateSpecializationKind()) {
11748 case TSK_Undeclared:
11749 case TSK_ExplicitSpecialization:
11750 case TSK_ExplicitInstantiationDeclaration:
11751 // The key function is in another translation unit.
11752 DefineVTable = false;
11755 case TSK_ExplicitInstantiationDefinition:
11756 case TSK_ImplicitInstantiation:
11757 // We will be instantiating the key function.
11760 } else if (!KeyFunction) {
11761 // If we have a class with no key function that is the subject
11762 // of an explicit instantiation declaration, suppress the
11763 // vtable; it will live with the explicit instantiation
11765 bool IsExplicitInstantiationDeclaration
11766 = Class->getTemplateSpecializationKind()
11767 == TSK_ExplicitInstantiationDeclaration;
11768 for (TagDecl::redecl_iterator R = Class->redecls_begin(),
11769 REnd = Class->redecls_end();
11771 TemplateSpecializationKind TSK
11772 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind();
11773 if (TSK == TSK_ExplicitInstantiationDeclaration)
11774 IsExplicitInstantiationDeclaration = true;
11775 else if (TSK == TSK_ExplicitInstantiationDefinition) {
11776 IsExplicitInstantiationDeclaration = false;
11781 if (IsExplicitInstantiationDeclaration)
11782 DefineVTable = false;
11785 // The exception specifications for all virtual members may be needed even
11786 // if we are not providing an authoritative form of the vtable in this TU.
11787 // We may choose to emit it available_externally anyway.
11788 if (!DefineVTable) {
11789 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class);
11793 // Mark all of the virtual members of this class as referenced, so
11794 // that we can build a vtable. Then, tell the AST consumer that a
11795 // vtable for this class is required.
11796 DefinedAnything = true;
11797 MarkVirtualMembersReferenced(Loc, Class);
11798 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl());
11799 Consumer.HandleVTable(Class, VTablesUsed[Canonical]);
11801 // Optionally warn if we're emitting a weak vtable.
11802 if (Class->hasExternalLinkage() &&
11803 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) {
11804 const FunctionDecl *KeyFunctionDef = 0;
11805 if (!KeyFunction ||
11806 (KeyFunction->hasBody(KeyFunctionDef) &&
11807 KeyFunctionDef->isInlined()))
11808 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() ==
11809 TSK_ExplicitInstantiationDefinition
11810 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable)
11814 VTableUses.clear();
11816 return DefinedAnything;
11819 void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc,
11820 const CXXRecordDecl *RD) {
11821 for (CXXRecordDecl::method_iterator I = RD->method_begin(),
11822 E = RD->method_end(); I != E; ++I)
11823 if ((*I)->isVirtual() && !(*I)->isPure())
11824 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>());
11827 void Sema::MarkVirtualMembersReferenced(SourceLocation Loc,
11828 const CXXRecordDecl *RD) {
11829 // Mark all functions which will appear in RD's vtable as used.
11830 CXXFinalOverriderMap FinalOverriders;
11831 RD->getFinalOverriders(FinalOverriders);
11832 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(),
11833 E = FinalOverriders.end();
11835 for (OverridingMethods::const_iterator OI = I->second.begin(),
11836 OE = I->second.end();
11838 assert(OI->second.size() > 0 && "no final overrider");
11839 CXXMethodDecl *Overrider = OI->second.front().Method;
11841 // C++ [basic.def.odr]p2:
11842 // [...] A virtual member function is used if it is not pure. [...]
11843 if (!Overrider->isPure())
11844 MarkFunctionReferenced(Loc, Overrider);
11848 // Only classes that have virtual bases need a VTT.
11849 if (RD->getNumVBases() == 0)
11852 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(),
11853 e = RD->bases_end(); i != e; ++i) {
11854 const CXXRecordDecl *Base =
11855 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl());
11856 if (Base->getNumVBases() == 0)
11858 MarkVirtualMembersReferenced(Loc, Base);
11862 /// SetIvarInitializers - This routine builds initialization ASTs for the
11863 /// Objective-C implementation whose ivars need be initialized.
11864 void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) {
11865 if (!getLangOpts().CPlusPlus)
11867 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) {
11868 SmallVector<ObjCIvarDecl*, 8> ivars;
11869 CollectIvarsToConstructOrDestruct(OID, ivars);
11872 SmallVector<CXXCtorInitializer*, 32> AllToInit;
11873 for (unsigned i = 0; i < ivars.size(); i++) {
11874 FieldDecl *Field = ivars[i];
11875 if (Field->isInvalidDecl())
11878 CXXCtorInitializer *Member;
11879 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field);
11880 InitializationKind InitKind =
11881 InitializationKind::CreateDefault(ObjCImplementation->getLocation());
11883 InitializationSequence InitSeq(*this, InitEntity, InitKind, None);
11884 ExprResult MemberInit =
11885 InitSeq.Perform(*this, InitEntity, InitKind, None);
11886 MemberInit = MaybeCreateExprWithCleanups(MemberInit);
11887 // Note, MemberInit could actually come back empty if no initialization
11888 // is required (e.g., because it would call a trivial default constructor)
11889 if (!MemberInit.get() || MemberInit.isInvalid())
11893 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(),
11895 MemberInit.takeAs<Expr>(),
11897 AllToInit.push_back(Member);
11899 // Be sure that the destructor is accessible and is marked as referenced.
11900 if (const RecordType *RecordTy
11901 = Context.getBaseElementType(Field->getType())
11902 ->getAs<RecordType>()) {
11903 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl());
11904 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) {
11905 MarkFunctionReferenced(Field->getLocation(), Destructor);
11906 CheckDestructorAccess(Field->getLocation(), Destructor,
11907 PDiag(diag::err_access_dtor_ivar)
11908 << Context.getBaseElementType(Field->getType()));
11912 ObjCImplementation->setIvarInitializers(Context,
11913 AllToInit.data(), AllToInit.size());
11918 void DelegatingCycleHelper(CXXConstructorDecl* Ctor,
11919 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid,
11920 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid,
11921 llvm::SmallSet<CXXConstructorDecl*, 4> &Current,
11923 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(),
11924 CE = Current.end();
11925 if (Ctor->isInvalidDecl())
11928 CXXConstructorDecl *Target = Ctor->getTargetConstructor();
11930 // Target may not be determinable yet, for instance if this is a dependent
11931 // call in an uninstantiated template.
11933 const FunctionDecl *FNTarget = 0;
11934 (void)Target->hasBody(FNTarget);
11935 Target = const_cast<CXXConstructorDecl*>(
11936 cast_or_null<CXXConstructorDecl>(FNTarget));
11939 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(),
11940 // Avoid dereferencing a null pointer here.
11941 *TCanonical = Target ? Target->getCanonicalDecl() : 0;
11943 if (!Current.insert(Canonical))
11946 // We know that beyond here, we aren't chaining into a cycle.
11947 if (!Target || !Target->isDelegatingConstructor() ||
11948 Target->isInvalidDecl() || Valid.count(TCanonical)) {
11949 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI)
11952 // We've hit a cycle.
11953 } else if (TCanonical == Canonical || Invalid.count(TCanonical) ||
11954 Current.count(TCanonical)) {
11955 // If we haven't diagnosed this cycle yet, do so now.
11956 if (!Invalid.count(TCanonical)) {
11957 S.Diag((*Ctor->init_begin())->getSourceLocation(),
11958 diag::warn_delegating_ctor_cycle)
11961 // Don't add a note for a function delegating directly to itself.
11962 if (TCanonical != Canonical)
11963 S.Diag(Target->getLocation(), diag::note_it_delegates_to);
11965 CXXConstructorDecl *C = Target;
11966 while (C->getCanonicalDecl() != Canonical) {
11967 const FunctionDecl *FNTarget = 0;
11968 (void)C->getTargetConstructor()->hasBody(FNTarget);
11969 assert(FNTarget && "Ctor cycle through bodiless function");
11971 C = const_cast<CXXConstructorDecl*>(
11972 cast<CXXConstructorDecl>(FNTarget));
11973 S.Diag(C->getLocation(), diag::note_which_delegates_to);
11977 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI)
11978 Invalid.insert(*CI);
11981 DelegatingCycleHelper(Target, Valid, Invalid, Current, S);
11986 void Sema::CheckDelegatingCtorCycles() {
11987 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current;
11989 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(),
11990 CE = Current.end();
11992 for (DelegatingCtorDeclsType::iterator
11993 I = DelegatingCtorDecls.begin(ExternalSource),
11994 E = DelegatingCtorDecls.end();
11996 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this);
11998 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI)
11999 (*CI)->setInvalidDecl();
12003 /// \brief AST visitor that finds references to the 'this' expression.
12004 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> {
12008 explicit FindCXXThisExpr(Sema &S) : S(S) { }
12010 bool VisitCXXThisExpr(CXXThisExpr *E) {
12011 S.Diag(E->getLocation(), diag::err_this_static_member_func)
12012 << E->isImplicit();
12018 bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) {
12019 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
12023 TypeLoc TL = TSInfo->getTypeLoc();
12024 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>();
12028 // C++11 [expr.prim.general]p3:
12029 // [The expression this] shall not appear before the optional
12030 // cv-qualifier-seq and it shall not appear within the declaration of a
12031 // static member function (although its type and value category are defined
12032 // within a static member function as they are within a non-static member
12033 // function). [ Note: this is because declaration matching does not occur
12034 // until the complete declarator is known. - end note ]
12035 const FunctionProtoType *Proto = ProtoTL.getTypePtr();
12036 FindCXXThisExpr Finder(*this);
12038 // If the return type came after the cv-qualifier-seq, check it now.
12039 if (Proto->hasTrailingReturn() &&
12040 !Finder.TraverseTypeLoc(ProtoTL.getResultLoc()))
12043 // Check the exception specification.
12044 if (checkThisInStaticMemberFunctionExceptionSpec(Method))
12047 return checkThisInStaticMemberFunctionAttributes(Method);
12050 bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) {
12051 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
12055 TypeLoc TL = TSInfo->getTypeLoc();
12056 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>();
12060 const FunctionProtoType *Proto = ProtoTL.getTypePtr();
12061 FindCXXThisExpr Finder(*this);
12063 switch (Proto->getExceptionSpecType()) {
12064 case EST_Uninstantiated:
12065 case EST_Unevaluated:
12066 case EST_BasicNoexcept:
12067 case EST_DynamicNone:
12072 case EST_ComputedNoexcept:
12073 if (!Finder.TraverseStmt(Proto->getNoexceptExpr()))
12077 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(),
12078 EEnd = Proto->exception_end();
12080 if (!Finder.TraverseType(*E))
12089 bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) {
12090 FindCXXThisExpr Finder(*this);
12092 // Check attributes.
12093 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end();
12095 // FIXME: This should be emitted by tblgen.
12097 ArrayRef<Expr *> Args;
12098 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A))
12100 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A))
12102 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A))
12103 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size());
12104 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A))
12105 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size());
12106 else if (ExclusiveLockFunctionAttr *ELF
12107 = dyn_cast<ExclusiveLockFunctionAttr>(*A))
12108 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size());
12109 else if (SharedLockFunctionAttr *SLF
12110 = dyn_cast<SharedLockFunctionAttr>(*A))
12111 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size());
12112 else if (ExclusiveTrylockFunctionAttr *ETLF
12113 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) {
12114 Arg = ETLF->getSuccessValue();
12115 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size());
12116 } else if (SharedTrylockFunctionAttr *STLF
12117 = dyn_cast<SharedTrylockFunctionAttr>(*A)) {
12118 Arg = STLF->getSuccessValue();
12119 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size());
12120 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A))
12121 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size());
12122 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A))
12123 Arg = LR->getArg();
12124 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A))
12125 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size());
12126 else if (ExclusiveLocksRequiredAttr *ELR
12127 = dyn_cast<ExclusiveLocksRequiredAttr>(*A))
12128 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size());
12129 else if (SharedLocksRequiredAttr *SLR
12130 = dyn_cast<SharedLocksRequiredAttr>(*A))
12131 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size());
12133 if (Arg && !Finder.TraverseStmt(Arg))
12136 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
12137 if (!Finder.TraverseStmt(Args[I]))
12146 Sema::checkExceptionSpecification(ExceptionSpecificationType EST,
12147 ArrayRef<ParsedType> DynamicExceptions,
12148 ArrayRef<SourceRange> DynamicExceptionRanges,
12149 Expr *NoexceptExpr,
12150 SmallVectorImpl<QualType> &Exceptions,
12151 FunctionProtoType::ExtProtoInfo &EPI) {
12152 Exceptions.clear();
12153 EPI.ExceptionSpecType = EST;
12154 if (EST == EST_Dynamic) {
12155 Exceptions.reserve(DynamicExceptions.size());
12156 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) {
12157 // FIXME: Preserve type source info.
12158 QualType ET = GetTypeFromParser(DynamicExceptions[ei]);
12160 SmallVector<UnexpandedParameterPack, 2> Unexpanded;
12161 collectUnexpandedParameterPacks(ET, Unexpanded);
12162 if (!Unexpanded.empty()) {
12163 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(),
12164 UPPC_ExceptionType,
12169 // Check that the type is valid for an exception spec, and
12171 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei]))
12172 Exceptions.push_back(ET);
12174 EPI.NumExceptions = Exceptions.size();
12175 EPI.Exceptions = Exceptions.data();
12179 if (EST == EST_ComputedNoexcept) {
12180 // If an error occurred, there's no expression here.
12181 if (NoexceptExpr) {
12182 assert((NoexceptExpr->isTypeDependent() ||
12183 NoexceptExpr->getType()->getCanonicalTypeUnqualified() ==
12185 "Parser should have made sure that the expression is boolean");
12186 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) {
12187 EPI.ExceptionSpecType = EST_BasicNoexcept;
12191 if (!NoexceptExpr->isValueDependent())
12192 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0,
12193 diag::err_noexcept_needs_constant_expression,
12194 /*AllowFold*/ false).take();
12195 EPI.NoexceptExpr = NoexceptExpr;
12201 /// IdentifyCUDATarget - Determine the CUDA compilation target for this function
12202 Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) {
12203 // Implicitly declared functions (e.g. copy constructors) are
12204 // __host__ __device__
12205 if (D->isImplicit())
12206 return CFT_HostDevice;
12208 if (D->hasAttr<CUDAGlobalAttr>())
12211 if (D->hasAttr<CUDADeviceAttr>()) {
12212 if (D->hasAttr<CUDAHostAttr>())
12213 return CFT_HostDevice;
12221 bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget,
12222 CUDAFunctionTarget CalleeTarget) {
12223 // CUDA B.1.1 "The __device__ qualifier declares a function that is...
12224 // Callable from the device only."
12225 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device)
12228 // CUDA B.1.2 "The __global__ qualifier declares a function that is...
12229 // Callable from the host only."
12230 // CUDA B.1.3 "The __host__ qualifier declares a function that is...
12231 // Callable from the host only."
12232 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) &&
12233 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global))
12236 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice)
12242 /// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class.
12244 MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record,
12245 SourceLocation DeclStart,
12246 Declarator &D, Expr *BitWidth,
12247 InClassInitStyle InitStyle,
12248 AccessSpecifier AS,
12249 AttributeList *MSPropertyAttr) {
12250 IdentifierInfo *II = D.getIdentifier();
12252 Diag(DeclStart, diag::err_anonymous_property);
12255 SourceLocation Loc = D.getIdentifierLoc();
12257 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
12258 QualType T = TInfo->getType();
12259 if (getLangOpts().CPlusPlus) {
12260 CheckExtraCXXDefaultArguments(D);
12262 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
12263 UPPC_DataMemberType)) {
12264 D.setInvalidType();
12266 TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
12270 DiagnoseFunctionSpecifiers(D.getDeclSpec());
12272 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec())
12273 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
12274 diag::err_invalid_thread)
12275 << DeclSpec::getSpecifierName(TSCS);
12277 // Check to see if this name was declared as a member previously
12278 NamedDecl *PrevDecl = 0;
12279 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration);
12280 LookupName(Previous, S);
12281 switch (Previous.getResultKind()) {
12282 case LookupResult::Found:
12283 case LookupResult::FoundUnresolvedValue:
12284 PrevDecl = Previous.getAsSingle<NamedDecl>();
12287 case LookupResult::FoundOverloaded:
12288 PrevDecl = Previous.getRepresentativeDecl();
12291 case LookupResult::NotFound:
12292 case LookupResult::NotFoundInCurrentInstantiation:
12293 case LookupResult::Ambiguous:
12297 if (PrevDecl && PrevDecl->isTemplateParameter()) {
12298 // Maybe we will complain about the shadowed template parameter.
12299 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
12300 // Just pretend that we didn't see the previous declaration.
12304 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
12307 SourceLocation TSSL = D.getLocStart();
12308 MSPropertyDecl *NewPD;
12309 const AttributeList::PropertyData &Data = MSPropertyAttr->getPropertyData();
12310 NewPD = new (Context) MSPropertyDecl(Record, Loc,
12311 II, T, TInfo, TSSL,
12312 Data.GetterId, Data.SetterId);
12313 ProcessDeclAttributes(TUScope, NewPD, D);
12314 NewPD->setAccess(AS);
12316 if (NewPD->isInvalidDecl())
12317 Record->setInvalidDecl();
12319 if (D.getDeclSpec().isModulePrivateSpecified())
12320 NewPD->setModulePrivate();
12322 if (NewPD->isInvalidDecl() && PrevDecl) {
12323 // Don't introduce NewFD into scope; there's already something
12324 // with the same name in the same scope.
12326 PushOnScopeChains(NewPD, S);
12328 Record->addDecl(NewPD);