1 //===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements semantic analysis for C++ declarations.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Sema/SemaInternal.h"
15 #include "clang/Sema/CXXFieldCollector.h"
16 #include "clang/Sema/Scope.h"
17 #include "clang/Sema/Initialization.h"
18 #include "clang/Sema/Lookup.h"
19 #include "clang/AST/ASTConsumer.h"
20 #include "clang/AST/ASTContext.h"
21 #include "clang/AST/ASTMutationListener.h"
22 #include "clang/AST/CharUnits.h"
23 #include "clang/AST/CXXInheritance.h"
24 #include "clang/AST/DeclVisitor.h"
25 #include "clang/AST/ExprCXX.h"
26 #include "clang/AST/RecordLayout.h"
27 #include "clang/AST/StmtVisitor.h"
28 #include "clang/AST/TypeLoc.h"
29 #include "clang/AST/TypeOrdering.h"
30 #include "clang/Sema/DeclSpec.h"
31 #include "clang/Sema/ParsedTemplate.h"
32 #include "clang/Basic/PartialDiagnostic.h"
33 #include "clang/Lex/Preprocessor.h"
34 #include "llvm/ADT/DenseSet.h"
35 #include "llvm/ADT/STLExtras.h"
39 using namespace clang;
41 //===----------------------------------------------------------------------===//
42 // CheckDefaultArgumentVisitor
43 //===----------------------------------------------------------------------===//
46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses
47 /// the default argument of a parameter to determine whether it
48 /// contains any ill-formed subexpressions. For example, this will
49 /// diagnose the use of local variables or parameters within the
50 /// default argument expression.
51 class CheckDefaultArgumentVisitor
52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> {
57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
58 : DefaultArg(defarg), S(s) {}
60 bool VisitExpr(Expr *Node);
61 bool VisitDeclRefExpr(DeclRefExpr *DRE);
62 bool VisitCXXThisExpr(CXXThisExpr *ThisE);
65 /// VisitExpr - Visit all of the children of this expression.
66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) {
67 bool IsInvalid = false;
68 for (Stmt::child_range I = Node->children(); I; ++I)
69 IsInvalid |= Visit(*I);
73 /// VisitDeclRefExpr - Visit a reference to a declaration, to
74 /// determine whether this declaration can be used in the default
75 /// argument expression.
76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) {
77 NamedDecl *Decl = DRE->getDecl();
78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) {
79 // C++ [dcl.fct.default]p9
80 // Default arguments are evaluated each time the function is
81 // called. The order of evaluation of function arguments is
82 // unspecified. Consequently, parameters of a function shall not
83 // be used in default argument expressions, even if they are not
84 // evaluated. Parameters of a function declared before a default
85 // argument expression are in scope and can hide namespace and
86 // class member names.
87 return S->Diag(DRE->getSourceRange().getBegin(),
88 diag::err_param_default_argument_references_param)
89 << Param->getDeclName() << DefaultArg->getSourceRange();
90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) {
91 // C++ [dcl.fct.default]p7
92 // Local variables shall not be used in default argument
94 if (VDecl->isLocalVarDecl())
95 return S->Diag(DRE->getSourceRange().getBegin(),
96 diag::err_param_default_argument_references_local)
97 << VDecl->getDeclName() << DefaultArg->getSourceRange();
103 /// VisitCXXThisExpr - Visit a C++ "this" expression.
104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) {
105 // C++ [dcl.fct.default]p8:
106 // The keyword this shall not be used in a default argument of a
108 return S->Diag(ThisE->getSourceRange().getBegin(),
109 diag::err_param_default_argument_references_this)
110 << ThisE->getSourceRange();
114 void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) {
115 assert(Context && "ImplicitExceptionSpecification without an ASTContext");
116 // If we have an MSAny or unknown spec already, don't bother.
117 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed)
120 const FunctionProtoType *Proto
121 = Method->getType()->getAs<FunctionProtoType>();
123 ExceptionSpecificationType EST = Proto->getExceptionSpecType();
125 // If this function can throw any exceptions, make a note of that.
126 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) {
132 // FIXME: If the call to this decl is using any of its default arguments, we
133 // need to search them for potentially-throwing calls.
135 // If this function has a basic noexcept, it doesn't affect the outcome.
136 if (EST == EST_BasicNoexcept)
139 // If we have a throw-all spec at this point, ignore the function.
140 if (ComputedEST == EST_None)
143 // If we're still at noexcept(true) and there's a nothrow() callee,
144 // change to that specification.
145 if (EST == EST_DynamicNone) {
146 if (ComputedEST == EST_BasicNoexcept)
147 ComputedEST = EST_DynamicNone;
151 // Check out noexcept specs.
152 if (EST == EST_ComputedNoexcept) {
153 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context);
154 assert(NR != FunctionProtoType::NR_NoNoexcept &&
155 "Must have noexcept result for EST_ComputedNoexcept.");
156 assert(NR != FunctionProtoType::NR_Dependent &&
157 "Should not generate implicit declarations for dependent cases, "
158 "and don't know how to handle them anyway.");
160 // noexcept(false) -> no spec on the new function
161 if (NR == FunctionProtoType::NR_Throw) {
163 ComputedEST = EST_None;
165 // noexcept(true) won't change anything either.
169 assert(EST == EST_Dynamic && "EST case not considered earlier.");
170 assert(ComputedEST != EST_None &&
171 "Shouldn't collect exceptions when throw-all is guaranteed.");
172 ComputedEST = EST_Dynamic;
173 // Record the exceptions in this function's exception specification.
174 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(),
175 EEnd = Proto->exception_end();
177 if (ExceptionsSeen.insert(Context->getCanonicalType(*E)))
178 Exceptions.push_back(*E);
181 void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) {
182 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed)
187 // C++0x [except.spec]p14:
188 // [An] implicit exception-specification specifies the type-id T if and
189 // only if T is allowed by the exception-specification of a function directly
190 // invoked by f's implicit definition; f shall allow all exceptions if any
191 // function it directly invokes allows all exceptions, and f shall allow no
192 // exceptions if every function it directly invokes allows no exceptions.
194 // Note in particular that if an implicit exception-specification is generated
195 // for a function containing a throw-expression, that specification can still
196 // be noexcept(true).
198 // Note also that 'directly invoked' is not defined in the standard, and there
199 // is no indication that we should only consider potentially-evaluated calls.
201 // Ultimately we should implement the intent of the standard: the exception
202 // specification should be the set of exceptions which can be thrown by the
203 // implicit definition. For now, we assume that any non-nothrow expression can
204 // throw any exception.
206 if (E->CanThrow(*Context))
207 ComputedEST = EST_None;
211 Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg,
212 SourceLocation EqualLoc) {
213 if (RequireCompleteType(Param->getLocation(), Param->getType(),
214 diag::err_typecheck_decl_incomplete_type)) {
215 Param->setInvalidDecl();
219 // C++ [dcl.fct.default]p5
220 // A default argument expression is implicitly converted (clause
221 // 4) to the parameter type. The default argument expression has
222 // the same semantic constraints as the initializer expression in
223 // a declaration of a variable of the parameter type, using the
224 // copy-initialization semantics (8.5).
225 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
227 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(),
229 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1);
230 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
231 MultiExprArg(*this, &Arg, 1));
232 if (Result.isInvalid())
234 Arg = Result.takeAs<Expr>();
236 CheckImplicitConversions(Arg, EqualLoc);
237 Arg = MaybeCreateExprWithCleanups(Arg);
239 // Okay: add the default argument to the parameter
240 Param->setDefaultArg(Arg);
242 // We have already instantiated this parameter; provide each of the
243 // instantiations with the uninstantiated default argument.
244 UnparsedDefaultArgInstantiationsMap::iterator InstPos
245 = UnparsedDefaultArgInstantiations.find(Param);
246 if (InstPos != UnparsedDefaultArgInstantiations.end()) {
247 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I)
248 InstPos->second[I]->setUninstantiatedDefaultArg(Arg);
250 // We're done tracking this parameter's instantiations.
251 UnparsedDefaultArgInstantiations.erase(InstPos);
257 /// ActOnParamDefaultArgument - Check whether the default argument
258 /// provided for a function parameter is well-formed. If so, attach it
259 /// to the parameter declaration.
261 Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc,
263 if (!param || !DefaultArg)
266 ParmVarDecl *Param = cast<ParmVarDecl>(param);
267 UnparsedDefaultArgLocs.erase(Param);
269 // Default arguments are only permitted in C++
270 if (!getLangOptions().CPlusPlus) {
271 Diag(EqualLoc, diag::err_param_default_argument)
272 << DefaultArg->getSourceRange();
273 Param->setInvalidDecl();
277 // Check for unexpanded parameter packs.
278 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) {
279 Param->setInvalidDecl();
283 // Check that the default argument is well-formed
284 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this);
285 if (DefaultArgChecker.Visit(DefaultArg)) {
286 Param->setInvalidDecl();
290 SetParamDefaultArgument(Param, DefaultArg, EqualLoc);
293 /// ActOnParamUnparsedDefaultArgument - We've seen a default
294 /// argument for a function parameter, but we can't parse it yet
295 /// because we're inside a class definition. Note that this default
296 /// argument will be parsed later.
297 void Sema::ActOnParamUnparsedDefaultArgument(Decl *param,
298 SourceLocation EqualLoc,
299 SourceLocation ArgLoc) {
303 ParmVarDecl *Param = cast<ParmVarDecl>(param);
305 Param->setUnparsedDefaultArg();
307 UnparsedDefaultArgLocs[Param] = ArgLoc;
310 /// ActOnParamDefaultArgumentError - Parsing or semantic analysis of
311 /// the default argument for the parameter param failed.
312 void Sema::ActOnParamDefaultArgumentError(Decl *param) {
316 ParmVarDecl *Param = cast<ParmVarDecl>(param);
318 Param->setInvalidDecl();
320 UnparsedDefaultArgLocs.erase(Param);
323 /// CheckExtraCXXDefaultArguments - Check for any extra default
324 /// arguments in the declarator, which is not a function declaration
325 /// or definition and therefore is not permitted to have default
326 /// arguments. This routine should be invoked for every declarator
327 /// that is not a function declaration or definition.
328 void Sema::CheckExtraCXXDefaultArguments(Declarator &D) {
329 // C++ [dcl.fct.default]p3
330 // A default argument expression shall be specified only in the
331 // parameter-declaration-clause of a function declaration or in a
332 // template-parameter (14.1). It shall not be specified for a
333 // parameter pack. If it is specified in a
334 // parameter-declaration-clause, it shall not occur within a
335 // declarator or abstract-declarator of a parameter-declaration.
336 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
337 DeclaratorChunk &chunk = D.getTypeObject(i);
338 if (chunk.Kind == DeclaratorChunk::Function) {
339 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) {
341 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param);
342 if (Param->hasUnparsedDefaultArg()) {
343 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens;
344 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
345 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation());
347 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0;
348 } else if (Param->getDefaultArg()) {
349 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
350 << Param->getDefaultArg()->getSourceRange();
351 Param->setDefaultArg(0);
358 // MergeCXXFunctionDecl - Merge two declarations of the same C++
359 // function, once we already know that they have the same
360 // type. Subroutine of MergeFunctionDecl. Returns true if there was an
361 // error, false otherwise.
362 bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) {
363 bool Invalid = false;
365 // C++ [dcl.fct.default]p4:
366 // For non-template functions, default arguments can be added in
367 // later declarations of a function in the same
368 // scope. Declarations in different scopes have completely
369 // distinct sets of default arguments. That is, declarations in
370 // inner scopes do not acquire default arguments from
371 // declarations in outer scopes, and vice versa. In a given
372 // function declaration, all parameters subsequent to a
373 // parameter with a default argument shall have default
374 // arguments supplied in this or previous declarations. A
375 // default argument shall not be redefined by a later
376 // declaration (not even to the same value).
378 // C++ [dcl.fct.default]p6:
379 // Except for member functions of class templates, the default arguments
380 // in a member function definition that appears outside of the class
381 // definition are added to the set of default arguments provided by the
382 // member function declaration in the class definition.
383 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) {
384 ParmVarDecl *OldParam = Old->getParamDecl(p);
385 ParmVarDecl *NewParam = New->getParamDecl(p);
387 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) {
389 unsigned DiagDefaultParamID =
390 diag::err_param_default_argument_redefinition;
392 // MSVC accepts that default parameters be redefined for member functions
393 // of template class. The new default parameter's value is ignored.
395 if (getLangOptions().Microsoft) {
396 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New);
397 if (MD && MD->getParent()->getDescribedClassTemplate()) {
398 // Merge the old default argument into the new parameter.
399 NewParam->setHasInheritedDefaultArg();
400 if (OldParam->hasUninstantiatedDefaultArg())
401 NewParam->setUninstantiatedDefaultArg(
402 OldParam->getUninstantiatedDefaultArg());
404 NewParam->setDefaultArg(OldParam->getInit());
405 DiagDefaultParamID = diag::warn_param_default_argument_redefinition;
410 // FIXME: If we knew where the '=' was, we could easily provide a fix-it
411 // hint here. Alternatively, we could walk the type-source information
412 // for NewParam to find the last source location in the type... but it
413 // isn't worth the effort right now. This is the kind of test case that
414 // is hard to get right:
416 // void g(int (*fp)(int) = f);
417 // void g(int (*fp)(int) = &f);
418 Diag(NewParam->getLocation(), DiagDefaultParamID)
419 << NewParam->getDefaultArgRange();
421 // Look for the function declaration where the default argument was
422 // actually written, which may be a declaration prior to Old.
423 for (FunctionDecl *Older = Old->getPreviousDeclaration();
424 Older; Older = Older->getPreviousDeclaration()) {
425 if (!Older->getParamDecl(p)->hasDefaultArg())
428 OldParam = Older->getParamDecl(p);
431 Diag(OldParam->getLocation(), diag::note_previous_definition)
432 << OldParam->getDefaultArgRange();
433 } else if (OldParam->hasDefaultArg()) {
434 // Merge the old default argument into the new parameter.
435 // It's important to use getInit() here; getDefaultArg()
436 // strips off any top-level ExprWithCleanups.
437 NewParam->setHasInheritedDefaultArg();
438 if (OldParam->hasUninstantiatedDefaultArg())
439 NewParam->setUninstantiatedDefaultArg(
440 OldParam->getUninstantiatedDefaultArg());
442 NewParam->setDefaultArg(OldParam->getInit());
443 } else if (NewParam->hasDefaultArg()) {
444 if (New->getDescribedFunctionTemplate()) {
445 // Paragraph 4, quoted above, only applies to non-template functions.
446 Diag(NewParam->getLocation(),
447 diag::err_param_default_argument_template_redecl)
448 << NewParam->getDefaultArgRange();
449 Diag(Old->getLocation(), diag::note_template_prev_declaration)
451 } else if (New->getTemplateSpecializationKind()
452 != TSK_ImplicitInstantiation &&
453 New->getTemplateSpecializationKind() != TSK_Undeclared) {
454 // C++ [temp.expr.spec]p21:
455 // Default function arguments shall not be specified in a declaration
456 // or a definition for one of the following explicit specializations:
457 // - the explicit specialization of a function template;
458 // - the explicit specialization of a member function template;
459 // - the explicit specialization of a member function of a class
460 // template where the class template specialization to which the
461 // member function specialization belongs is implicitly
463 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg)
464 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization)
465 << New->getDeclName()
466 << NewParam->getDefaultArgRange();
467 } else if (New->getDeclContext()->isDependentContext()) {
468 // C++ [dcl.fct.default]p6 (DR217):
469 // Default arguments for a member function of a class template shall
470 // be specified on the initial declaration of the member function
471 // within the class template.
473 // Reading the tea leaves a bit in DR217 and its reference to DR205
474 // leads me to the conclusion that one cannot add default function
475 // arguments for an out-of-line definition of a member function of a
478 if (CXXRecordDecl *Record
479 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) {
480 if (Record->getDescribedClassTemplate())
482 else if (isa<ClassTemplatePartialSpecializationDecl>(Record))
488 Diag(NewParam->getLocation(),
489 diag::err_param_default_argument_member_template_redecl)
491 << NewParam->getDefaultArgRange();
492 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) {
493 CXXSpecialMember NewSM = getSpecialMember(Ctor),
494 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old));
495 if (NewSM != OldSM) {
496 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special)
497 << NewParam->getDefaultArgRange() << NewSM;
498 Diag(Old->getLocation(), diag::note_previous_declaration_special)
505 if (CheckEquivalentExceptionSpec(Old, New))
511 /// \brief Merge the exception specifications of two variable declarations.
513 /// This is called when there's a redeclaration of a VarDecl. The function
514 /// checks if the redeclaration might have an exception specification and
515 /// validates compatibility and merges the specs if necessary.
516 void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) {
517 // Shortcut if exceptions are disabled.
518 if (!getLangOptions().CXXExceptions)
521 assert(Context.hasSameType(New->getType(), Old->getType()) &&
522 "Should only be called if types are otherwise the same.");
524 QualType NewType = New->getType();
525 QualType OldType = Old->getType();
527 // We're only interested in pointers and references to functions, as well
528 // as pointers to member functions.
529 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) {
530 NewType = R->getPointeeType();
531 OldType = OldType->getAs<ReferenceType>()->getPointeeType();
532 } else if (const PointerType *P = NewType->getAs<PointerType>()) {
533 NewType = P->getPointeeType();
534 OldType = OldType->getAs<PointerType>()->getPointeeType();
535 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) {
536 NewType = M->getPointeeType();
537 OldType = OldType->getAs<MemberPointerType>()->getPointeeType();
540 if (!NewType->isFunctionProtoType())
543 // There's lots of special cases for functions. For function pointers, system
544 // libraries are hopefully not as broken so that we don't need these
546 if (CheckEquivalentExceptionSpec(
547 OldType->getAs<FunctionProtoType>(), Old->getLocation(),
548 NewType->getAs<FunctionProtoType>(), New->getLocation())) {
549 New->setInvalidDecl();
553 /// CheckCXXDefaultArguments - Verify that the default arguments for a
554 /// function declaration are well-formed according to C++
555 /// [dcl.fct.default].
556 void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) {
557 unsigned NumParams = FD->getNumParams();
560 // Find first parameter with a default argument
561 for (p = 0; p < NumParams; ++p) {
562 ParmVarDecl *Param = FD->getParamDecl(p);
563 if (Param->hasDefaultArg())
567 // C++ [dcl.fct.default]p4:
568 // In a given function declaration, all parameters
569 // subsequent to a parameter with a default argument shall
570 // have default arguments supplied in this or previous
571 // declarations. A default argument shall not be redefined
572 // by a later declaration (not even to the same value).
573 unsigned LastMissingDefaultArg = 0;
574 for (; p < NumParams; ++p) {
575 ParmVarDecl *Param = FD->getParamDecl(p);
576 if (!Param->hasDefaultArg()) {
577 if (Param->isInvalidDecl())
578 /* We already complained about this parameter. */;
579 else if (Param->getIdentifier())
580 Diag(Param->getLocation(),
581 diag::err_param_default_argument_missing_name)
582 << Param->getIdentifier();
584 Diag(Param->getLocation(),
585 diag::err_param_default_argument_missing);
587 LastMissingDefaultArg = p;
591 if (LastMissingDefaultArg > 0) {
592 // Some default arguments were missing. Clear out all of the
593 // default arguments up to (and including) the last missing
594 // default argument, so that we leave the function parameters
595 // in a semantically valid state.
596 for (p = 0; p <= LastMissingDefaultArg; ++p) {
597 ParmVarDecl *Param = FD->getParamDecl(p);
598 if (Param->hasDefaultArg()) {
599 Param->setDefaultArg(0);
605 /// isCurrentClassName - Determine whether the identifier II is the
606 /// name of the class type currently being defined. In the case of
607 /// nested classes, this will only return true if II is the name of
608 /// the innermost class.
609 bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *,
610 const CXXScopeSpec *SS) {
611 assert(getLangOptions().CPlusPlus && "No class names in C!");
613 CXXRecordDecl *CurDecl;
614 if (SS && SS->isSet() && !SS->isInvalid()) {
615 DeclContext *DC = computeDeclContext(*SS, true);
616 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
618 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
620 if (CurDecl && CurDecl->getIdentifier())
621 return &II == CurDecl->getIdentifier();
626 /// \brief Check the validity of a C++ base class specifier.
628 /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics
629 /// and returns NULL otherwise.
631 Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
632 SourceRange SpecifierRange,
633 bool Virtual, AccessSpecifier Access,
634 TypeSourceInfo *TInfo,
635 SourceLocation EllipsisLoc) {
636 QualType BaseType = TInfo->getType();
638 // C++ [class.union]p1:
639 // A union shall not have base classes.
640 if (Class->isUnion()) {
641 Diag(Class->getLocation(), diag::err_base_clause_on_union)
646 if (EllipsisLoc.isValid() &&
647 !TInfo->getType()->containsUnexpandedParameterPack()) {
648 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
649 << TInfo->getTypeLoc().getSourceRange();
650 EllipsisLoc = SourceLocation();
653 if (BaseType->isDependentType())
654 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
655 Class->getTagKind() == TTK_Class,
656 Access, TInfo, EllipsisLoc);
658 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc();
660 // Base specifiers must be record types.
661 if (!BaseType->isRecordType()) {
662 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange;
666 // C++ [class.union]p1:
667 // A union shall not be used as a base class.
668 if (BaseType->isUnionType()) {
669 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange;
673 // C++ [class.derived]p2:
674 // The class-name in a base-specifier shall not be an incompletely
676 if (RequireCompleteType(BaseLoc, BaseType,
677 PDiag(diag::err_incomplete_base_class)
678 << SpecifierRange)) {
679 Class->setInvalidDecl();
683 // If the base class is polymorphic or isn't empty, the new one is/isn't, too.
684 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl();
685 assert(BaseDecl && "Record type has no declaration");
686 BaseDecl = BaseDecl->getDefinition();
687 assert(BaseDecl && "Base type is not incomplete, but has no definition");
688 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl);
689 assert(CXXBaseDecl && "Base type is not a C++ type");
692 // If a class is marked final and it appears as a base-type-specifier in
693 // base-clause, the program is ill-formed.
694 if (CXXBaseDecl->hasAttr<FinalAttr>()) {
695 Diag(BaseLoc, diag::err_class_marked_final_used_as_base)
696 << CXXBaseDecl->getDeclName();
697 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl)
698 << CXXBaseDecl->getDeclName();
702 if (BaseDecl->isInvalidDecl())
703 Class->setInvalidDecl();
705 // Create the base specifier.
706 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
707 Class->getTagKind() == TTK_Class,
708 Access, TInfo, EllipsisLoc);
711 /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
712 /// one entry in the base class list of a class specifier, for
714 /// class foo : public bar, virtual private baz {
715 /// 'public bar' and 'virtual private baz' are each base-specifiers.
717 Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange,
718 bool Virtual, AccessSpecifier Access,
719 ParsedType basetype, SourceLocation BaseLoc,
720 SourceLocation EllipsisLoc) {
724 AdjustDeclIfTemplate(classdecl);
725 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl);
729 TypeSourceInfo *TInfo = 0;
730 GetTypeFromParser(basetype, &TInfo);
732 if (EllipsisLoc.isInvalid() &&
733 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo,
737 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange,
738 Virtual, Access, TInfo,
745 /// \brief Performs the actual work of attaching the given base class
746 /// specifiers to a C++ class.
747 bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases,
752 // Used to keep track of which base types we have already seen, so
753 // that we can properly diagnose redundant direct base types. Note
754 // that the key is always the unqualified canonical type of the base
756 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes;
758 // Copy non-redundant base specifiers into permanent storage.
759 unsigned NumGoodBases = 0;
760 bool Invalid = false;
761 for (unsigned idx = 0; idx < NumBases; ++idx) {
763 = Context.getCanonicalType(Bases[idx]->getType());
764 NewBaseType = NewBaseType.getLocalUnqualifiedType();
765 if (KnownBaseTypes[NewBaseType]) {
767 // A class shall not be specified as a direct base class of a
768 // derived class more than once.
769 Diag(Bases[idx]->getSourceRange().getBegin(),
770 diag::err_duplicate_base_class)
771 << KnownBaseTypes[NewBaseType]->getType()
772 << Bases[idx]->getSourceRange();
774 // Delete the duplicate base class specifier; we're going to
775 // overwrite its pointer later.
776 Context.Deallocate(Bases[idx]);
780 // Okay, add this new base class.
781 KnownBaseTypes[NewBaseType] = Bases[idx];
782 Bases[NumGoodBases++] = Bases[idx];
786 // Attach the remaining base class specifiers to the derived class.
787 Class->setBases(Bases, NumGoodBases);
789 // Delete the remaining (good) base class specifiers, since their
790 // data has been copied into the CXXRecordDecl.
791 for (unsigned idx = 0; idx < NumGoodBases; ++idx)
792 Context.Deallocate(Bases[idx]);
797 /// ActOnBaseSpecifiers - Attach the given base specifiers to the
798 /// class, after checking whether there are any duplicate base
800 void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases,
802 if (!ClassDecl || !Bases || !NumBases)
805 AdjustDeclIfTemplate(ClassDecl);
806 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl),
807 (CXXBaseSpecifier**)(Bases), NumBases);
810 static CXXRecordDecl *GetClassForType(QualType T) {
811 if (const RecordType *RT = T->getAs<RecordType>())
812 return cast<CXXRecordDecl>(RT->getDecl());
813 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>())
814 return ICT->getDecl();
819 /// \brief Determine whether the type \p Derived is a C++ class that is
820 /// derived from the type \p Base.
821 bool Sema::IsDerivedFrom(QualType Derived, QualType Base) {
822 if (!getLangOptions().CPlusPlus)
825 CXXRecordDecl *DerivedRD = GetClassForType(Derived);
829 CXXRecordDecl *BaseRD = GetClassForType(Base);
833 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this.
834 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD);
837 /// \brief Determine whether the type \p Derived is a C++ class that is
838 /// derived from the type \p Base.
839 bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) {
840 if (!getLangOptions().CPlusPlus)
843 CXXRecordDecl *DerivedRD = GetClassForType(Derived);
847 CXXRecordDecl *BaseRD = GetClassForType(Base);
851 return DerivedRD->isDerivedFrom(BaseRD, Paths);
854 void Sema::BuildBasePathArray(const CXXBasePaths &Paths,
855 CXXCastPath &BasePathArray) {
856 assert(BasePathArray.empty() && "Base path array must be empty!");
857 assert(Paths.isRecordingPaths() && "Must record paths!");
859 const CXXBasePath &Path = Paths.front();
861 // We first go backward and check if we have a virtual base.
862 // FIXME: It would be better if CXXBasePath had the base specifier for
863 // the nearest virtual base.
865 for (unsigned I = Path.size(); I != 0; --I) {
866 if (Path[I - 1].Base->isVirtual()) {
872 // Now add all bases.
873 for (unsigned I = Start, E = Path.size(); I != E; ++I)
874 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base));
877 /// \brief Determine whether the given base path includes a virtual
879 bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) {
880 for (CXXCastPath::const_iterator B = BasePath.begin(),
881 BEnd = BasePath.end();
883 if ((*B)->isVirtual())
889 /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base
890 /// conversion (where Derived and Base are class types) is
891 /// well-formed, meaning that the conversion is unambiguous (and
892 /// that all of the base classes are accessible). Returns true
893 /// and emits a diagnostic if the code is ill-formed, returns false
894 /// otherwise. Loc is the location where this routine should point to
895 /// if there is an error, and Range is the source range to highlight
896 /// if there is an error.
898 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
899 unsigned InaccessibleBaseID,
900 unsigned AmbigiousBaseConvID,
901 SourceLocation Loc, SourceRange Range,
902 DeclarationName Name,
903 CXXCastPath *BasePath) {
904 // First, determine whether the path from Derived to Base is
905 // ambiguous. This is slightly more expensive than checking whether
906 // the Derived to Base conversion exists, because here we need to
907 // explore multiple paths to determine if there is an ambiguity.
908 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
909 /*DetectVirtual=*/false);
910 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths);
911 assert(DerivationOkay &&
912 "Can only be used with a derived-to-base conversion");
913 (void)DerivationOkay;
915 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) {
916 if (InaccessibleBaseID) {
917 // Check that the base class can be accessed.
918 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(),
919 InaccessibleBaseID)) {
920 case AR_inaccessible:
929 // Build a base path if necessary.
931 BuildBasePathArray(Paths, *BasePath);
935 // We know that the derived-to-base conversion is ambiguous, and
936 // we're going to produce a diagnostic. Perform the derived-to-base
937 // search just one more time to compute all of the possible paths so
938 // that we can print them out. This is more expensive than any of
939 // the previous derived-to-base checks we've done, but at this point
940 // performance isn't as much of an issue.
942 Paths.setRecordingPaths(true);
943 bool StillOkay = IsDerivedFrom(Derived, Base, Paths);
944 assert(StillOkay && "Can only be used with a derived-to-base conversion");
947 // Build up a textual representation of the ambiguous paths, e.g.,
948 // D -> B -> A, that will be used to illustrate the ambiguous
949 // conversions in the diagnostic. We only print one of the paths
950 // to each base class subobject.
951 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths);
953 Diag(Loc, AmbigiousBaseConvID)
954 << Derived << Base << PathDisplayStr << Range << Name;
959 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
960 SourceLocation Loc, SourceRange Range,
961 CXXCastPath *BasePath,
963 return CheckDerivedToBaseConversion(Derived, Base,
965 : diag::err_upcast_to_inaccessible_base,
966 diag::err_ambiguous_derived_to_base_conv,
967 Loc, Range, DeclarationName(),
972 /// @brief Builds a string representing ambiguous paths from a
973 /// specific derived class to different subobjects of the same base
976 /// This function builds a string that can be used in error messages
977 /// to show the different paths that one can take through the
978 /// inheritance hierarchy to go from the derived class to different
979 /// subobjects of a base class. The result looks something like this:
981 /// struct D -> struct B -> struct A
982 /// struct D -> struct C -> struct A
984 std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) {
985 std::string PathDisplayStr;
986 std::set<unsigned> DisplayedPaths;
987 for (CXXBasePaths::paths_iterator Path = Paths.begin();
988 Path != Paths.end(); ++Path) {
989 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) {
990 // We haven't displayed a path to this particular base
991 // class subobject yet.
992 PathDisplayStr += "\n ";
993 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString();
994 for (CXXBasePath::const_iterator Element = Path->begin();
995 Element != Path->end(); ++Element)
996 PathDisplayStr += " -> " + Element->Base->getType().getAsString();
1000 return PathDisplayStr;
1003 //===----------------------------------------------------------------------===//
1004 // C++ class member Handling
1005 //===----------------------------------------------------------------------===//
1007 /// ActOnAccessSpecifier - Parsed an access specifier followed by a colon.
1008 Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access,
1009 SourceLocation ASLoc,
1010 SourceLocation ColonLoc) {
1011 assert(Access != AS_none && "Invalid kind for syntactic access specifier!");
1012 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext,
1014 CurContext->addHiddenDecl(ASDecl);
1018 /// CheckOverrideControl - Check C++0x override control semantics.
1019 void Sema::CheckOverrideControl(const Decl *D) {
1020 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D);
1021 if (!MD || !MD->isVirtual())
1024 if (MD->isDependentContext())
1027 // C++0x [class.virtual]p3:
1028 // If a virtual function is marked with the virt-specifier override and does
1029 // not override a member function of a base class,
1030 // the program is ill-formed.
1031 bool HasOverriddenMethods =
1032 MD->begin_overridden_methods() != MD->end_overridden_methods();
1033 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) {
1034 Diag(MD->getLocation(),
1035 diag::err_function_marked_override_not_overriding)
1036 << MD->getDeclName();
1041 /// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member
1042 /// function overrides a virtual member function marked 'final', according to
1043 /// C++0x [class.virtual]p3.
1044 bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New,
1045 const CXXMethodDecl *Old) {
1046 if (!Old->hasAttr<FinalAttr>())
1049 Diag(New->getLocation(), diag::err_final_function_overridden)
1050 << New->getDeclName();
1051 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
1055 /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member
1056 /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the
1057 /// bitfield width if there is one, 'InitExpr' specifies the initializer if
1058 /// one has been parsed, and 'HasDeferredInit' is true if an initializer is
1059 /// present but parsing it has been deferred.
1061 Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
1062 MultiTemplateParamsArg TemplateParameterLists,
1063 ExprTy *BW, const VirtSpecifiers &VS,
1064 ExprTy *InitExpr, bool HasDeferredInit,
1065 bool IsDefinition) {
1066 const DeclSpec &DS = D.getDeclSpec();
1067 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
1068 DeclarationName Name = NameInfo.getName();
1069 SourceLocation Loc = NameInfo.getLoc();
1071 // For anonymous bitfields, the location should point to the type.
1072 if (Loc.isInvalid())
1073 Loc = D.getSourceRange().getBegin();
1075 Expr *BitWidth = static_cast<Expr*>(BW);
1076 Expr *Init = static_cast<Expr*>(InitExpr);
1078 assert(isa<CXXRecordDecl>(CurContext));
1079 assert(!DS.isFriendSpecified());
1080 assert(!Init || !HasDeferredInit);
1082 bool isFunc = D.isDeclarationOfFunction();
1084 // C++ 9.2p6: A member shall not be declared to have automatic storage
1085 // duration (auto, register) or with the extern storage-class-specifier.
1086 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class
1087 // data members and cannot be applied to names declared const or static,
1088 // and cannot be applied to reference members.
1089 switch (DS.getStorageClassSpec()) {
1090 case DeclSpec::SCS_unspecified:
1091 case DeclSpec::SCS_typedef:
1092 case DeclSpec::SCS_static:
1095 case DeclSpec::SCS_mutable:
1097 if (DS.getStorageClassSpecLoc().isValid())
1098 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function);
1100 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function);
1102 // FIXME: It would be nicer if the keyword was ignored only for this
1103 // declarator. Otherwise we could get follow-up errors.
1104 D.getMutableDeclSpec().ClearStorageClassSpecs();
1108 if (DS.getStorageClassSpecLoc().isValid())
1109 Diag(DS.getStorageClassSpecLoc(),
1110 diag::err_storageclass_invalid_for_member);
1112 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member);
1113 D.getMutableDeclSpec().ClearStorageClassSpecs();
1116 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
1117 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
1122 CXXScopeSpec &SS = D.getCXXScopeSpec();
1124 if (SS.isSet() && !SS.isInvalid()) {
1125 // The user provided a superfluous scope specifier inside a class
1131 DeclContext *DC = 0;
1132 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext))
1133 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification)
1134 << Name << FixItHint::CreateRemoval(SS.getRange());
1136 Diag(D.getIdentifierLoc(), diag::err_member_qualification)
1137 << Name << SS.getRange();
1142 // FIXME: Check for template parameters!
1143 // FIXME: Check that the name is an identifier!
1144 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth,
1145 HasDeferredInit, AS);
1146 assert(Member && "HandleField never returns null");
1148 assert(!HasDeferredInit);
1150 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition);
1155 // Non-instance-fields can't have a bitfield.
1157 if (Member->isInvalidDecl()) {
1158 // don't emit another diagnostic.
1159 } else if (isa<VarDecl>(Member)) {
1160 // C++ 9.6p3: A bit-field shall not be a static member.
1161 // "static member 'A' cannot be a bit-field"
1162 Diag(Loc, diag::err_static_not_bitfield)
1163 << Name << BitWidth->getSourceRange();
1164 } else if (isa<TypedefDecl>(Member)) {
1165 // "typedef member 'x' cannot be a bit-field"
1166 Diag(Loc, diag::err_typedef_not_bitfield)
1167 << Name << BitWidth->getSourceRange();
1169 // A function typedef ("typedef int f(); f a;").
1170 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
1171 Diag(Loc, diag::err_not_integral_type_bitfield)
1172 << Name << cast<ValueDecl>(Member)->getType()
1173 << BitWidth->getSourceRange();
1177 Member->setInvalidDecl();
1180 Member->setAccess(AS);
1182 // If we have declared a member function template, set the access of the
1183 // templated declaration as well.
1184 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member))
1185 FunTmpl->getTemplatedDecl()->setAccess(AS);
1188 if (VS.isOverrideSpecified()) {
1189 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member);
1190 if (!MD || !MD->isVirtual()) {
1191 Diag(Member->getLocStart(),
1192 diag::override_keyword_only_allowed_on_virtual_member_functions)
1193 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc());
1195 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context));
1197 if (VS.isFinalSpecified()) {
1198 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member);
1199 if (!MD || !MD->isVirtual()) {
1200 Diag(Member->getLocStart(),
1201 diag::override_keyword_only_allowed_on_virtual_member_functions)
1202 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc());
1204 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context));
1207 if (VS.getLastLocation().isValid()) {
1208 // Update the end location of a method that has a virt-specifiers.
1209 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member))
1210 MD->setRangeEnd(VS.getLastLocation());
1213 CheckOverrideControl(Member);
1215 assert((Name || isInstField) && "No identifier for non-field ?");
1218 AddInitializerToDecl(Member, Init, false,
1219 DS.getTypeSpecType() == DeclSpec::TST_auto);
1220 else if (DS.getTypeSpecType() == DeclSpec::TST_auto &&
1221 DS.getStorageClassSpec() == DeclSpec::SCS_static) {
1222 // C++0x [dcl.spec.auto]p4: 'auto' can only be used in the type of a static
1223 // data member if a brace-or-equal-initializer is provided.
1224 Diag(Loc, diag::err_auto_var_requires_init)
1225 << Name << cast<ValueDecl>(Member)->getType();
1226 Member->setInvalidDecl();
1229 FinalizeDeclaration(Member);
1232 FieldCollector->Add(cast<FieldDecl>(Member));
1236 /// ActOnCXXInClassMemberInitializer - This is invoked after parsing an
1237 /// in-class initializer for a non-static C++ class member. Such parsing
1238 /// is deferred until the class is complete.
1240 Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc,
1242 FieldDecl *FD = cast<FieldDecl>(D);
1245 FD->setInvalidDecl();
1246 FD->removeInClassInitializer();
1250 ExprResult Init = InitExpr;
1251 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) {
1252 // FIXME: if there is no EqualLoc, this is list-initialization.
1253 Init = PerformCopyInitialization(
1254 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr);
1255 if (Init.isInvalid()) {
1256 FD->setInvalidDecl();
1260 CheckImplicitConversions(Init.get(), EqualLoc);
1263 // C++0x [class.base.init]p7:
1264 // The initialization of each base and member constitutes a
1266 Init = MaybeCreateExprWithCleanups(Init);
1267 if (Init.isInvalid()) {
1268 FD->setInvalidDecl();
1272 InitExpr = Init.release();
1274 FD->setInClassInitializer(InitExpr);
1277 /// \brief Find the direct and/or virtual base specifiers that
1278 /// correspond to the given base type, for use in base initialization
1279 /// within a constructor.
1280 static bool FindBaseInitializer(Sema &SemaRef,
1281 CXXRecordDecl *ClassDecl,
1283 const CXXBaseSpecifier *&DirectBaseSpec,
1284 const CXXBaseSpecifier *&VirtualBaseSpec) {
1285 // First, check for a direct base class.
1287 for (CXXRecordDecl::base_class_const_iterator Base
1288 = ClassDecl->bases_begin();
1289 Base != ClassDecl->bases_end(); ++Base) {
1290 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) {
1291 // We found a direct base of this type. That's what we're
1293 DirectBaseSpec = &*Base;
1298 // Check for a virtual base class.
1299 // FIXME: We might be able to short-circuit this if we know in advance that
1300 // there are no virtual bases.
1301 VirtualBaseSpec = 0;
1302 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) {
1303 // We haven't found a base yet; search the class hierarchy for a
1304 // virtual base class.
1305 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1306 /*DetectVirtual=*/false);
1307 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl),
1309 for (CXXBasePaths::paths_iterator Path = Paths.begin();
1310 Path != Paths.end(); ++Path) {
1311 if (Path->back().Base->isVirtual()) {
1312 VirtualBaseSpec = Path->back().Base;
1319 return DirectBaseSpec || VirtualBaseSpec;
1322 /// ActOnMemInitializer - Handle a C++ member initializer.
1324 Sema::ActOnMemInitializer(Decl *ConstructorD,
1327 IdentifierInfo *MemberOrBase,
1328 ParsedType TemplateTypeTy,
1329 SourceLocation IdLoc,
1330 SourceLocation LParenLoc,
1331 ExprTy **Args, unsigned NumArgs,
1332 SourceLocation RParenLoc,
1333 SourceLocation EllipsisLoc) {
1337 AdjustDeclIfTemplate(ConstructorD);
1339 CXXConstructorDecl *Constructor
1340 = dyn_cast<CXXConstructorDecl>(ConstructorD);
1342 // The user wrote a constructor initializer on a function that is
1343 // not a C++ constructor. Ignore the error for now, because we may
1344 // have more member initializers coming; we'll diagnose it just
1345 // once in ActOnMemInitializers.
1349 CXXRecordDecl *ClassDecl = Constructor->getParent();
1351 // C++ [class.base.init]p2:
1352 // Names in a mem-initializer-id are looked up in the scope of the
1353 // constructor's class and, if not found in that scope, are looked
1354 // up in the scope containing the constructor's definition.
1355 // [Note: if the constructor's class contains a member with the
1356 // same name as a direct or virtual base class of the class, a
1357 // mem-initializer-id naming the member or base class and composed
1358 // of a single identifier refers to the class member. A
1359 // mem-initializer-id for the hidden base class may be specified
1360 // using a qualified name. ]
1361 if (!SS.getScopeRep() && !TemplateTypeTy) {
1362 // Look for a member, first.
1363 FieldDecl *Member = 0;
1364 DeclContext::lookup_result Result
1365 = ClassDecl->lookup(MemberOrBase);
1366 if (Result.first != Result.second) {
1367 Member = dyn_cast<FieldDecl>(*Result.first);
1370 if (EllipsisLoc.isValid())
1371 Diag(EllipsisLoc, diag::err_pack_expansion_member_init)
1372 << MemberOrBase << SourceRange(IdLoc, RParenLoc);
1374 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc,
1375 LParenLoc, RParenLoc);
1378 // Handle anonymous union case.
1379 if (IndirectFieldDecl* IndirectField
1380 = dyn_cast<IndirectFieldDecl>(*Result.first)) {
1381 if (EllipsisLoc.isValid())
1382 Diag(EllipsisLoc, diag::err_pack_expansion_member_init)
1383 << MemberOrBase << SourceRange(IdLoc, RParenLoc);
1385 return BuildMemberInitializer(IndirectField, (Expr**)Args,
1387 LParenLoc, RParenLoc);
1391 // It didn't name a member, so see if it names a class.
1393 TypeSourceInfo *TInfo = 0;
1395 if (TemplateTypeTy) {
1396 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo);
1398 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName);
1399 LookupParsedName(R, S, &SS);
1401 TypeDecl *TyD = R.getAsSingle<TypeDecl>();
1403 if (R.isAmbiguous()) return true;
1405 // We don't want access-control diagnostics here.
1406 R.suppressDiagnostics();
1408 if (SS.isSet() && isDependentScopeSpecifier(SS)) {
1409 bool NotUnknownSpecialization = false;
1410 DeclContext *DC = computeDeclContext(SS, false);
1411 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC))
1412 NotUnknownSpecialization = !Record->hasAnyDependentBases();
1414 if (!NotUnknownSpecialization) {
1415 // When the scope specifier can refer to a member of an unknown
1416 // specialization, we take it as a type name.
1417 BaseType = CheckTypenameType(ETK_None, SourceLocation(),
1418 SS.getWithLocInContext(Context),
1419 *MemberOrBase, IdLoc);
1420 if (BaseType.isNull())
1424 R.setLookupName(MemberOrBase);
1428 // If no results were found, try to correct typos.
1429 TypoCorrection Corr;
1430 if (R.empty() && BaseType.isNull() &&
1431 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS,
1432 ClassDecl, false, CTC_NoKeywords))) {
1433 std::string CorrectedStr(Corr.getAsString(getLangOptions()));
1434 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions()));
1435 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) {
1436 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) {
1437 // We have found a non-static data member with a similar
1438 // name to what was typed; complain and initialize that
1440 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest)
1441 << MemberOrBase << true << CorrectedQuotedStr
1442 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr);
1443 Diag(Member->getLocation(), diag::note_previous_decl)
1444 << CorrectedQuotedStr;
1446 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc,
1447 LParenLoc, RParenLoc);
1449 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) {
1450 const CXXBaseSpecifier *DirectBaseSpec;
1451 const CXXBaseSpecifier *VirtualBaseSpec;
1452 if (FindBaseInitializer(*this, ClassDecl,
1453 Context.getTypeDeclType(Type),
1454 DirectBaseSpec, VirtualBaseSpec)) {
1455 // We have found a direct or virtual base class with a
1456 // similar name to what was typed; complain and initialize
1458 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest)
1459 << MemberOrBase << false << CorrectedQuotedStr
1460 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr);
1462 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec
1464 Diag(BaseSpec->getSourceRange().getBegin(),
1465 diag::note_base_class_specified_here)
1466 << BaseSpec->getType()
1467 << BaseSpec->getSourceRange();
1474 if (!TyD && BaseType.isNull()) {
1475 Diag(IdLoc, diag::err_mem_init_not_member_or_class)
1476 << MemberOrBase << SourceRange(IdLoc, RParenLoc);
1481 if (BaseType.isNull()) {
1482 BaseType = Context.getTypeDeclType(TyD);
1484 NestedNameSpecifier *Qualifier =
1485 static_cast<NestedNameSpecifier*>(SS.getScopeRep());
1487 // FIXME: preserve source range information
1488 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType);
1494 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc);
1496 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs,
1497 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc);
1500 /// Checks an initializer expression for use of uninitialized fields, such as
1501 /// containing the field that is being initialized. Returns true if there is an
1502 /// uninitialized field was used an updates the SourceLocation parameter; false
1504 static bool InitExprContainsUninitializedFields(const Stmt *S,
1505 const ValueDecl *LhsField,
1506 SourceLocation *L) {
1507 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField));
1509 if (isa<CallExpr>(S)) {
1510 // Do not descend into function calls or constructors, as the use
1511 // of an uninitialized field may be valid. One would have to inspect
1512 // the contents of the function/ctor to determine if it is safe or not.
1513 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers
1514 // may be safe, depending on what the function/ctor does.
1517 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) {
1518 const NamedDecl *RhsField = ME->getMemberDecl();
1520 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) {
1521 // The member expression points to a static data member.
1522 assert(VD->isStaticDataMember() &&
1523 "Member points to non-static data member!");
1528 if (isa<EnumConstantDecl>(RhsField)) {
1529 // The member expression points to an enum.
1533 if (RhsField == LhsField) {
1534 // Initializing a field with itself. Throw a warning.
1535 // But wait; there are exceptions!
1536 // Exception #1: The field may not belong to this record.
1537 // e.g. Foo(const Foo& rhs) : A(rhs.A) {}
1538 const Expr *base = ME->getBase();
1539 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) {
1540 // Even though the field matches, it does not belong to this record.
1543 // None of the exceptions triggered; return true to indicate an
1544 // uninitialized field was used.
1545 *L = ME->getMemberLoc();
1548 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) {
1549 // sizeof/alignof doesn't reference contents, do not warn.
1551 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) {
1552 // address-of doesn't reference contents (the pointer may be dereferenced
1553 // in the same expression but it would be rare; and weird).
1554 if (UOE->getOpcode() == UO_AddrOf)
1557 for (Stmt::const_child_range it = S->children(); it; ++it) {
1559 // An expression such as 'member(arg ?: "")' may trigger this.
1562 if (InitExprContainsUninitializedFields(*it, LhsField, L))
1569 Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args,
1570 unsigned NumArgs, SourceLocation IdLoc,
1571 SourceLocation LParenLoc,
1572 SourceLocation RParenLoc) {
1573 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member);
1574 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member);
1575 assert((DirectMember || IndirectMember) &&
1576 "Member must be a FieldDecl or IndirectFieldDecl");
1578 if (Member->isInvalidDecl())
1581 // Diagnose value-uses of fields to initialize themselves, e.g.
1583 // where foo is not also a parameter to the constructor.
1584 // TODO: implement -Wuninitialized and fold this into that framework.
1585 for (unsigned i = 0; i < NumArgs; ++i) {
1587 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) {
1588 // FIXME: Return true in the case when other fields are used before being
1589 // uninitialized. For example, let this field be the i'th field. When
1590 // initializing the i'th field, throw a warning if any of the >= i'th
1591 // fields are used, as they are not yet initialized.
1592 // Right now we are only handling the case where the i'th field uses
1593 // itself in its initializer.
1594 Diag(L, diag::warn_field_is_uninit);
1598 bool HasDependentArg = false;
1599 for (unsigned i = 0; i < NumArgs; i++)
1600 HasDependentArg |= Args[i]->isTypeDependent();
1603 if (Member->getType()->isDependentType() || HasDependentArg) {
1604 // Can't check initialization for a member of dependent type or when
1605 // any of the arguments are type-dependent expressions.
1606 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs,
1608 Member->getType().getNonReferenceType());
1610 DiscardCleanupsInEvaluationContext();
1612 // Initialize the member.
1613 InitializedEntity MemberEntity =
1614 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0)
1615 : InitializedEntity::InitializeMember(IndirectMember, 0);
1616 InitializationKind Kind =
1617 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc);
1619 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs);
1621 ExprResult MemberInit =
1622 InitSeq.Perform(*this, MemberEntity, Kind,
1623 MultiExprArg(*this, Args, NumArgs), 0);
1624 if (MemberInit.isInvalid())
1627 CheckImplicitConversions(MemberInit.get(), LParenLoc);
1629 // C++0x [class.base.init]p7:
1630 // The initialization of each base and member constitutes a
1632 MemberInit = MaybeCreateExprWithCleanups(MemberInit);
1633 if (MemberInit.isInvalid())
1636 // If we are in a dependent context, template instantiation will
1637 // perform this type-checking again. Just save the arguments that we
1638 // received in a ParenListExpr.
1639 // FIXME: This isn't quite ideal, since our ASTs don't capture all
1640 // of the information that we have about the member
1641 // initializer. However, deconstructing the ASTs is a dicey process,
1642 // and this approach is far more likely to get the corner cases right.
1643 if (CurContext->isDependentContext())
1644 Init = new (Context) ParenListExpr(
1645 Context, LParenLoc, Args, NumArgs, RParenLoc,
1646 Member->getType().getNonReferenceType());
1648 Init = MemberInit.get();
1652 return new (Context) CXXCtorInitializer(Context, DirectMember,
1653 IdLoc, LParenLoc, Init,
1656 return new (Context) CXXCtorInitializer(Context, IndirectMember,
1657 IdLoc, LParenLoc, Init,
1663 Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo,
1664 Expr **Args, unsigned NumArgs,
1665 SourceLocation NameLoc,
1666 SourceLocation LParenLoc,
1667 SourceLocation RParenLoc,
1668 CXXRecordDecl *ClassDecl) {
1669 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin();
1670 if (!LangOpts.CPlusPlus0x)
1671 return Diag(Loc, diag::err_delegation_0x_only)
1672 << TInfo->getTypeLoc().getLocalSourceRange();
1674 // Initialize the object.
1675 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation(
1676 QualType(ClassDecl->getTypeForDecl(), 0));
1677 InitializationKind Kind =
1678 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc);
1680 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs);
1682 ExprResult DelegationInit =
1683 InitSeq.Perform(*this, DelegationEntity, Kind,
1684 MultiExprArg(*this, Args, NumArgs), 0);
1685 if (DelegationInit.isInvalid())
1688 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get());
1689 CXXConstructorDecl *Constructor
1690 = ConExpr->getConstructor();
1691 assert(Constructor && "Delegating constructor with no target?");
1693 CheckImplicitConversions(DelegationInit.get(), LParenLoc);
1695 // C++0x [class.base.init]p7:
1696 // The initialization of each base and member constitutes a
1698 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit);
1699 if (DelegationInit.isInvalid())
1702 assert(!CurContext->isDependentContext());
1703 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor,
1704 DelegationInit.takeAs<Expr>(),
1709 Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo,
1710 Expr **Args, unsigned NumArgs,
1711 SourceLocation LParenLoc, SourceLocation RParenLoc,
1712 CXXRecordDecl *ClassDecl,
1713 SourceLocation EllipsisLoc) {
1714 bool HasDependentArg = false;
1715 for (unsigned i = 0; i < NumArgs; i++)
1716 HasDependentArg |= Args[i]->isTypeDependent();
1718 SourceLocation BaseLoc
1719 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin();
1721 if (!BaseType->isDependentType() && !BaseType->isRecordType())
1722 return Diag(BaseLoc, diag::err_base_init_does_not_name_class)
1723 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
1725 // C++ [class.base.init]p2:
1726 // [...] Unless the mem-initializer-id names a nonstatic data
1727 // member of the constructor's class or a direct or virtual base
1728 // of that class, the mem-initializer is ill-formed. A
1729 // mem-initializer-list can initialize a base class using any
1730 // name that denotes that base class type.
1731 bool Dependent = BaseType->isDependentType() || HasDependentArg;
1733 if (EllipsisLoc.isValid()) {
1734 // This is a pack expansion.
1735 if (!BaseType->containsUnexpandedParameterPack()) {
1736 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
1737 << SourceRange(BaseLoc, RParenLoc);
1739 EllipsisLoc = SourceLocation();
1742 // Check for any unexpanded parameter packs.
1743 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer))
1746 for (unsigned I = 0; I != NumArgs; ++I)
1747 if (DiagnoseUnexpandedParameterPack(Args[I]))
1751 // Check for direct and virtual base classes.
1752 const CXXBaseSpecifier *DirectBaseSpec = 0;
1753 const CXXBaseSpecifier *VirtualBaseSpec = 0;
1755 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0),
1757 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc,
1758 LParenLoc, RParenLoc, ClassDecl);
1760 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec,
1763 // C++ [base.class.init]p2:
1764 // Unless the mem-initializer-id names a nonstatic data member of the
1765 // constructor's class or a direct or virtual base of that class, the
1766 // mem-initializer is ill-formed.
1767 if (!DirectBaseSpec && !VirtualBaseSpec) {
1768 // If the class has any dependent bases, then it's possible that
1769 // one of those types will resolve to the same type as
1770 // BaseType. Therefore, just treat this as a dependent base
1771 // class initialization. FIXME: Should we try to check the
1772 // initialization anyway? It seems odd.
1773 if (ClassDecl->hasAnyDependentBases())
1776 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual)
1777 << BaseType << Context.getTypeDeclType(ClassDecl)
1778 << BaseTInfo->getTypeLoc().getLocalSourceRange();
1783 // Can't check initialization for a base of dependent type or when
1784 // any of the arguments are type-dependent expressions.
1786 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs,
1787 RParenLoc, BaseType));
1789 DiscardCleanupsInEvaluationContext();
1791 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
1792 /*IsVirtual=*/false,
1794 BaseInit.takeAs<Expr>(),
1799 // C++ [base.class.init]p2:
1800 // If a mem-initializer-id is ambiguous because it designates both
1801 // a direct non-virtual base class and an inherited virtual base
1802 // class, the mem-initializer is ill-formed.
1803 if (DirectBaseSpec && VirtualBaseSpec)
1804 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual)
1805 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
1807 CXXBaseSpecifier *BaseSpec
1808 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec);
1810 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec);
1812 // Initialize the base.
1813 InitializedEntity BaseEntity =
1814 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec);
1815 InitializationKind Kind =
1816 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc);
1818 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs);
1820 ExprResult BaseInit =
1821 InitSeq.Perform(*this, BaseEntity, Kind,
1822 MultiExprArg(*this, Args, NumArgs), 0);
1823 if (BaseInit.isInvalid())
1826 CheckImplicitConversions(BaseInit.get(), LParenLoc);
1828 // C++0x [class.base.init]p7:
1829 // The initialization of each base and member constitutes a
1831 BaseInit = MaybeCreateExprWithCleanups(BaseInit);
1832 if (BaseInit.isInvalid())
1835 // If we are in a dependent context, template instantiation will
1836 // perform this type-checking again. Just save the arguments that we
1837 // received in a ParenListExpr.
1838 // FIXME: This isn't quite ideal, since our ASTs don't capture all
1839 // of the information that we have about the base
1840 // initializer. However, deconstructing the ASTs is a dicey process,
1841 // and this approach is far more likely to get the corner cases right.
1842 if (CurContext->isDependentContext()) {
1844 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs,
1845 RParenLoc, BaseType));
1846 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
1847 BaseSpec->isVirtual(),
1849 Init.takeAs<Expr>(),
1854 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
1855 BaseSpec->isVirtual(),
1857 BaseInit.takeAs<Expr>(),
1862 /// ImplicitInitializerKind - How an implicit base or member initializer should
1863 /// initialize its base or member.
1864 enum ImplicitInitializerKind {
1871 BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
1872 ImplicitInitializerKind ImplicitInitKind,
1873 CXXBaseSpecifier *BaseSpec,
1874 bool IsInheritedVirtualBase,
1875 CXXCtorInitializer *&CXXBaseInit) {
1876 InitializedEntity InitEntity
1877 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec,
1878 IsInheritedVirtualBase);
1880 ExprResult BaseInit;
1882 switch (ImplicitInitKind) {
1884 InitializationKind InitKind
1885 = InitializationKind::CreateDefault(Constructor->getLocation());
1886 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0);
1887 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind,
1888 MultiExprArg(SemaRef, 0, 0));
1893 ParmVarDecl *Param = Constructor->getParamDecl(0);
1894 QualType ParamType = Param->getType().getNonReferenceType();
1897 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param,
1898 Constructor->getLocation(), ParamType,
1901 // Cast to the base class to avoid ambiguities.
1903 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(),
1904 ParamType.getQualifiers());
1906 CXXCastPath BasePath;
1907 BasePath.push_back(BaseSpec);
1908 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy,
1909 CK_UncheckedDerivedToBase,
1910 VK_LValue, &BasePath).take();
1912 InitializationKind InitKind
1913 = InitializationKind::CreateDirect(Constructor->getLocation(),
1914 SourceLocation(), SourceLocation());
1915 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind,
1917 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind,
1918 MultiExprArg(&CopyCtorArg, 1));
1923 assert(false && "Unhandled initializer kind!");
1926 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit);
1927 if (BaseInit.isInvalid())
1931 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
1932 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(),
1934 BaseSpec->isVirtual(),
1936 BaseInit.takeAs<Expr>(),
1944 BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
1945 ImplicitInitializerKind ImplicitInitKind,
1947 CXXCtorInitializer *&CXXMemberInit) {
1948 if (Field->isInvalidDecl())
1951 SourceLocation Loc = Constructor->getLocation();
1953 if (ImplicitInitKind == IIK_Copy) {
1954 ParmVarDecl *Param = Constructor->getParamDecl(0);
1955 QualType ParamType = Param->getType().getNonReferenceType();
1957 // Suppress copying zero-width bitfields.
1958 if (const Expr *Width = Field->getBitWidth())
1959 if (Width->EvaluateAsInt(SemaRef.Context) == 0)
1962 Expr *MemberExprBase =
1963 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param,
1964 Loc, ParamType, VK_LValue, 0);
1966 // Build a reference to this field within the parameter.
1968 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc,
1969 Sema::LookupMemberName);
1970 MemberLookup.addDecl(Field, AS_public);
1971 MemberLookup.resolveKind();
1972 ExprResult CopyCtorArg
1973 = SemaRef.BuildMemberReferenceExpr(MemberExprBase,
1977 /*FirstQualifierInScope=*/0,
1979 /*TemplateArgs=*/0);
1980 if (CopyCtorArg.isInvalid())
1983 // When the field we are copying is an array, create index variables for
1984 // each dimension of the array. We use these index variables to subscript
1985 // the source array, and other clients (e.g., CodeGen) will perform the
1986 // necessary iteration with these index variables.
1987 llvm::SmallVector<VarDecl *, 4> IndexVariables;
1988 QualType BaseType = Field->getType();
1989 QualType SizeType = SemaRef.Context.getSizeType();
1990 while (const ConstantArrayType *Array
1991 = SemaRef.Context.getAsConstantArrayType(BaseType)) {
1992 // Create the iteration variable for this array index.
1993 IdentifierInfo *IterationVarName = 0;
1995 llvm::SmallString<8> Str;
1996 llvm::raw_svector_ostream OS(Str);
1997 OS << "__i" << IndexVariables.size();
1998 IterationVarName = &SemaRef.Context.Idents.get(OS.str());
2000 VarDecl *IterationVar
2001 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc,
2002 IterationVarName, SizeType,
2003 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc),
2005 IndexVariables.push_back(IterationVar);
2007 // Create a reference to the iteration variable.
2008 ExprResult IterationVarRef
2009 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc);
2010 assert(!IterationVarRef.isInvalid() &&
2011 "Reference to invented variable cannot fail!");
2013 // Subscript the array with this iteration variable.
2014 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(),
2016 IterationVarRef.take(),
2018 if (CopyCtorArg.isInvalid())
2021 BaseType = Array->getElementType();
2024 // Construct the entity that we will be initializing. For an array, this
2025 // will be first element in the array, which may require several levels
2026 // of array-subscript entities.
2027 llvm::SmallVector<InitializedEntity, 4> Entities;
2028 Entities.reserve(1 + IndexVariables.size());
2029 Entities.push_back(InitializedEntity::InitializeMember(Field));
2030 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I)
2031 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context,
2035 // Direct-initialize to use the copy constructor.
2036 InitializationKind InitKind =
2037 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation());
2039 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>();
2040 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind,
2043 ExprResult MemberInit
2044 = InitSeq.Perform(SemaRef, Entities.back(), InitKind,
2045 MultiExprArg(&CopyCtorArgE, 1));
2046 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
2047 if (MemberInit.isInvalid())
2051 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc,
2052 MemberInit.takeAs<Expr>(), Loc,
2053 IndexVariables.data(),
2054 IndexVariables.size());
2058 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!");
2060 QualType FieldBaseElementType =
2061 SemaRef.Context.getBaseElementType(Field->getType());
2063 if (FieldBaseElementType->isRecordType()) {
2064 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field);
2065 InitializationKind InitKind =
2066 InitializationKind::CreateDefault(Loc);
2068 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0);
2069 ExprResult MemberInit =
2070 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg());
2072 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
2073 if (MemberInit.isInvalid())
2077 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
2084 if (!Field->getParent()->isUnion()) {
2085 if (FieldBaseElementType->isReferenceType()) {
2086 SemaRef.Diag(Constructor->getLocation(),
2087 diag::err_uninitialized_member_in_ctor)
2088 << (int)Constructor->isImplicit()
2089 << SemaRef.Context.getTagDeclType(Constructor->getParent())
2090 << 0 << Field->getDeclName();
2091 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
2095 if (FieldBaseElementType.isConstQualified()) {
2096 SemaRef.Diag(Constructor->getLocation(),
2097 diag::err_uninitialized_member_in_ctor)
2098 << (int)Constructor->isImplicit()
2099 << SemaRef.Context.getTagDeclType(Constructor->getParent())
2100 << 1 << Field->getDeclName();
2101 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
2106 if (SemaRef.getLangOptions().ObjCAutoRefCount &&
2107 FieldBaseElementType->isObjCRetainableType() &&
2108 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None &&
2109 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) {
2111 // Default-initialize Objective-C pointers to NULL.
2113 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field,
2115 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()),
2120 // Nothing to initialize.
2126 struct BaseAndFieldInfo {
2128 CXXConstructorDecl *Ctor;
2129 bool AnyErrorsInInits;
2130 ImplicitInitializerKind IIK;
2131 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields;
2132 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit;
2134 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits)
2135 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) {
2136 // FIXME: Handle implicit move constructors.
2137 if (Ctor->isImplicit() && Ctor->isCopyConstructor())
2145 static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info,
2146 FieldDecl *Top, FieldDecl *Field) {
2148 // Overwhelmingly common case: we have a direct initializer for this field.
2149 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) {
2150 Info.AllToInit.push_back(Init);
2154 // C++0x [class.base.init]p8: if the entity is a non-static data member that
2155 // has a brace-or-equal-initializer, the entity is initialized as specified
2157 if (Field->hasInClassInitializer()) {
2158 Info.AllToInit.push_back(
2159 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field,
2161 SourceLocation(), 0,
2166 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) {
2167 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>();
2168 assert(FieldClassType && "anonymous struct/union without record type");
2169 CXXRecordDecl *FieldClassDecl
2170 = cast<CXXRecordDecl>(FieldClassType->getDecl());
2172 // Even though union members never have non-trivial default
2173 // constructions in C++03, we still build member initializers for aggregate
2174 // record types which can be union members, and C++0x allows non-trivial
2175 // default constructors for union members, so we ensure that only one
2176 // member is initialized for these.
2177 if (FieldClassDecl->isUnion()) {
2178 // First check for an explicit initializer for one field.
2179 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(),
2180 EA = FieldClassDecl->field_end(); FA != EA; FA++) {
2181 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) {
2182 Info.AllToInit.push_back(Init);
2184 // Once we've initialized a field of an anonymous union, the union
2185 // field in the class is also initialized, so exit immediately.
2187 } else if ((*FA)->isAnonymousStructOrUnion()) {
2188 if (CollectFieldInitializer(SemaRef, Info, Top, *FA))
2193 // FIXME: C++0x unrestricted unions might call a default constructor here.
2196 // For structs, we simply descend through to initialize all members where
2198 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(),
2199 EA = FieldClassDecl->field_end(); FA != EA; FA++) {
2200 if (CollectFieldInitializer(SemaRef, Info, Top, *FA))
2206 // Don't try to build an implicit initializer if there were semantic
2207 // errors in any of the initializers (and therefore we might be
2208 // missing some that the user actually wrote).
2209 if (Info.AnyErrorsInInits || Field->isInvalidDecl())
2212 CXXCtorInitializer *Init = 0;
2213 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init))
2217 Info.AllToInit.push_back(Init);
2223 Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor,
2224 CXXCtorInitializer *Initializer) {
2225 assert(Initializer->isDelegatingInitializer());
2226 Constructor->setNumCtorInitializers(1);
2227 CXXCtorInitializer **initializer =
2228 new (Context) CXXCtorInitializer*[1];
2229 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*));
2230 Constructor->setCtorInitializers(initializer);
2232 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) {
2233 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor);
2234 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation());
2237 DelegatingCtorDecls.push_back(Constructor);
2242 bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor,
2243 CXXCtorInitializer **Initializers,
2244 unsigned NumInitializers,
2246 if (Constructor->getDeclContext()->isDependentContext()) {
2247 // Just store the initializers as written, they will be checked during
2249 if (NumInitializers > 0) {
2250 Constructor->setNumCtorInitializers(NumInitializers);
2251 CXXCtorInitializer **baseOrMemberInitializers =
2252 new (Context) CXXCtorInitializer*[NumInitializers];
2253 memcpy(baseOrMemberInitializers, Initializers,
2254 NumInitializers * sizeof(CXXCtorInitializer*));
2255 Constructor->setCtorInitializers(baseOrMemberInitializers);
2261 BaseAndFieldInfo Info(*this, Constructor, AnyErrors);
2263 // We need to build the initializer AST according to order of construction
2264 // and not what user specified in the Initializers list.
2265 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition();
2269 bool HadError = false;
2271 for (unsigned i = 0; i < NumInitializers; i++) {
2272 CXXCtorInitializer *Member = Initializers[i];
2274 if (Member->isBaseInitializer())
2275 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member;
2277 Info.AllBaseFields[Member->getAnyMember()] = Member;
2280 // Keep track of the direct virtual bases.
2281 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases;
2282 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(),
2283 E = ClassDecl->bases_end(); I != E; ++I) {
2285 DirectVBases.insert(I);
2288 // Push virtual bases before others.
2289 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(),
2290 E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
2292 if (CXXCtorInitializer *Value
2293 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) {
2294 Info.AllToInit.push_back(Value);
2295 } else if (!AnyErrors) {
2296 bool IsInheritedVirtualBase = !DirectVBases.count(VBase);
2297 CXXCtorInitializer *CXXBaseInit;
2298 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
2299 VBase, IsInheritedVirtualBase,
2305 Info.AllToInit.push_back(CXXBaseInit);
2309 // Non-virtual bases.
2310 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
2311 E = ClassDecl->bases_end(); Base != E; ++Base) {
2312 // Virtuals are in the virtual base list and already constructed.
2313 if (Base->isVirtual())
2316 if (CXXCtorInitializer *Value
2317 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) {
2318 Info.AllToInit.push_back(Value);
2319 } else if (!AnyErrors) {
2320 CXXCtorInitializer *CXXBaseInit;
2321 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
2322 Base, /*IsInheritedVirtualBase=*/false,
2328 Info.AllToInit.push_back(CXXBaseInit);
2333 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
2334 E = ClassDecl->field_end(); Field != E; ++Field) {
2335 if ((*Field)->getType()->isIncompleteArrayType()) {
2336 assert(ClassDecl->hasFlexibleArrayMember() &&
2337 "Incomplete array type is not valid");
2340 if (CollectFieldInitializer(*this, Info, *Field, *Field))
2344 NumInitializers = Info.AllToInit.size();
2345 if (NumInitializers > 0) {
2346 Constructor->setNumCtorInitializers(NumInitializers);
2347 CXXCtorInitializer **baseOrMemberInitializers =
2348 new (Context) CXXCtorInitializer*[NumInitializers];
2349 memcpy(baseOrMemberInitializers, Info.AllToInit.data(),
2350 NumInitializers * sizeof(CXXCtorInitializer*));
2351 Constructor->setCtorInitializers(baseOrMemberInitializers);
2353 // Constructors implicitly reference the base and member
2355 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(),
2356 Constructor->getParent());
2362 static void *GetKeyForTopLevelField(FieldDecl *Field) {
2363 // For anonymous unions, use the class declaration as the key.
2364 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) {
2365 if (RT->getDecl()->isAnonymousStructOrUnion())
2366 return static_cast<void *>(RT->getDecl());
2368 return static_cast<void *>(Field);
2371 static void *GetKeyForBase(ASTContext &Context, QualType BaseType) {
2372 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr());
2375 static void *GetKeyForMember(ASTContext &Context,
2376 CXXCtorInitializer *Member) {
2377 if (!Member->isAnyMemberInitializer())
2378 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0));
2380 // For fields injected into the class via declaration of an anonymous union,
2381 // use its anonymous union class declaration as the unique key.
2382 FieldDecl *Field = Member->getAnyMember();
2384 // If the field is a member of an anonymous struct or union, our key
2385 // is the anonymous record decl that's a direct child of the class.
2386 RecordDecl *RD = Field->getParent();
2387 if (RD->isAnonymousStructOrUnion()) {
2389 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext());
2390 if (Parent->isAnonymousStructOrUnion())
2396 return static_cast<void *>(RD);
2399 return static_cast<void *>(Field);
2403 DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef,
2404 const CXXConstructorDecl *Constructor,
2405 CXXCtorInitializer **Inits,
2406 unsigned NumInits) {
2407 if (Constructor->getDeclContext()->isDependentContext())
2410 // Don't check initializers order unless the warning is enabled at the
2411 // location of at least one initializer.
2412 bool ShouldCheckOrder = false;
2413 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) {
2414 CXXCtorInitializer *Init = Inits[InitIndex];
2415 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order,
2416 Init->getSourceLocation())
2417 != Diagnostic::Ignored) {
2418 ShouldCheckOrder = true;
2422 if (!ShouldCheckOrder)
2425 // Build the list of bases and members in the order that they'll
2426 // actually be initialized. The explicit initializers should be in
2427 // this same order but may be missing things.
2428 llvm::SmallVector<const void*, 32> IdealInitKeys;
2430 const CXXRecordDecl *ClassDecl = Constructor->getParent();
2432 // 1. Virtual bases.
2433 for (CXXRecordDecl::base_class_const_iterator VBase =
2434 ClassDecl->vbases_begin(),
2435 E = ClassDecl->vbases_end(); VBase != E; ++VBase)
2436 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType()));
2438 // 2. Non-virtual bases.
2439 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(),
2440 E = ClassDecl->bases_end(); Base != E; ++Base) {
2441 if (Base->isVirtual())
2443 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType()));
2446 // 3. Direct fields.
2447 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
2448 E = ClassDecl->field_end(); Field != E; ++Field)
2449 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field));
2451 unsigned NumIdealInits = IdealInitKeys.size();
2452 unsigned IdealIndex = 0;
2454 CXXCtorInitializer *PrevInit = 0;
2455 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) {
2456 CXXCtorInitializer *Init = Inits[InitIndex];
2457 void *InitKey = GetKeyForMember(SemaRef.Context, Init);
2459 // Scan forward to try to find this initializer in the idealized
2460 // initializers list.
2461 for (; IdealIndex != NumIdealInits; ++IdealIndex)
2462 if (InitKey == IdealInitKeys[IdealIndex])
2465 // If we didn't find this initializer, it must be because we
2466 // scanned past it on a previous iteration. That can only
2467 // happen if we're out of order; emit a warning.
2468 if (IdealIndex == NumIdealInits && PrevInit) {
2469 Sema::SemaDiagnosticBuilder D =
2470 SemaRef.Diag(PrevInit->getSourceLocation(),
2471 diag::warn_initializer_out_of_order);
2473 if (PrevInit->isAnyMemberInitializer())
2474 D << 0 << PrevInit->getAnyMember()->getDeclName();
2476 D << 1 << PrevInit->getBaseClassInfo()->getType();
2478 if (Init->isAnyMemberInitializer())
2479 D << 0 << Init->getAnyMember()->getDeclName();
2481 D << 1 << Init->getBaseClassInfo()->getType();
2483 // Move back to the initializer's location in the ideal list.
2484 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex)
2485 if (InitKey == IdealInitKeys[IdealIndex])
2488 assert(IdealIndex != NumIdealInits &&
2489 "initializer not found in initializer list");
2497 bool CheckRedundantInit(Sema &S,
2498 CXXCtorInitializer *Init,
2499 CXXCtorInitializer *&PrevInit) {
2505 if (FieldDecl *Field = Init->getMember())
2506 S.Diag(Init->getSourceLocation(),
2507 diag::err_multiple_mem_initialization)
2508 << Field->getDeclName()
2509 << Init->getSourceRange();
2511 const Type *BaseClass = Init->getBaseClass();
2512 assert(BaseClass && "neither field nor base");
2513 S.Diag(Init->getSourceLocation(),
2514 diag::err_multiple_base_initialization)
2515 << QualType(BaseClass, 0)
2516 << Init->getSourceRange();
2518 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer)
2519 << 0 << PrevInit->getSourceRange();
2524 typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry;
2525 typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap;
2527 bool CheckRedundantUnionInit(Sema &S,
2528 CXXCtorInitializer *Init,
2529 RedundantUnionMap &Unions) {
2530 FieldDecl *Field = Init->getAnyMember();
2531 RecordDecl *Parent = Field->getParent();
2532 if (!Parent->isAnonymousStructOrUnion())
2535 NamedDecl *Child = Field;
2537 if (Parent->isUnion()) {
2538 UnionEntry &En = Unions[Parent];
2539 if (En.first && En.first != Child) {
2540 S.Diag(Init->getSourceLocation(),
2541 diag::err_multiple_mem_union_initialization)
2542 << Field->getDeclName()
2543 << Init->getSourceRange();
2544 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer)
2545 << 0 << En.second->getSourceRange();
2547 } else if (!En.first) {
2554 Parent = cast<RecordDecl>(Parent->getDeclContext());
2555 } while (Parent->isAnonymousStructOrUnion());
2561 /// ActOnMemInitializers - Handle the member initializers for a constructor.
2562 void Sema::ActOnMemInitializers(Decl *ConstructorDecl,
2563 SourceLocation ColonLoc,
2564 MemInitTy **meminits, unsigned NumMemInits,
2566 if (!ConstructorDecl)
2569 AdjustDeclIfTemplate(ConstructorDecl);
2571 CXXConstructorDecl *Constructor
2572 = dyn_cast<CXXConstructorDecl>(ConstructorDecl);
2575 Diag(ColonLoc, diag::err_only_constructors_take_base_inits);
2579 CXXCtorInitializer **MemInits =
2580 reinterpret_cast<CXXCtorInitializer **>(meminits);
2582 // Mapping for the duplicate initializers check.
2583 // For member initializers, this is keyed with a FieldDecl*.
2584 // For base initializers, this is keyed with a Type*.
2585 llvm::DenseMap<void*, CXXCtorInitializer *> Members;
2587 // Mapping for the inconsistent anonymous-union initializers check.
2588 RedundantUnionMap MemberUnions;
2590 bool HadError = false;
2591 for (unsigned i = 0; i < NumMemInits; i++) {
2592 CXXCtorInitializer *Init = MemInits[i];
2594 // Set the source order index.
2595 Init->setSourceOrder(i);
2597 if (Init->isAnyMemberInitializer()) {
2598 FieldDecl *Field = Init->getAnyMember();
2599 if (CheckRedundantInit(*this, Init, Members[Field]) ||
2600 CheckRedundantUnionInit(*this, Init, MemberUnions))
2602 } else if (Init->isBaseInitializer()) {
2603 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0));
2604 if (CheckRedundantInit(*this, Init, Members[Key]))
2607 assert(Init->isDelegatingInitializer());
2608 // This must be the only initializer
2609 if (i != 0 || NumMemInits > 1) {
2610 Diag(MemInits[0]->getSourceLocation(),
2611 diag::err_delegating_initializer_alone)
2612 << MemInits[0]->getSourceRange();
2614 // We will treat this as being the only initializer.
2616 SetDelegatingInitializer(Constructor, MemInits[i]);
2617 // Return immediately as the initializer is set.
2625 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits);
2627 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors);
2631 Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location,
2632 CXXRecordDecl *ClassDecl) {
2633 // Ignore dependent contexts.
2634 if (ClassDecl->isDependentContext())
2637 // FIXME: all the access-control diagnostics are positioned on the
2638 // field/base declaration. That's probably good; that said, the
2639 // user might reasonably want to know why the destructor is being
2640 // emitted, and we currently don't say.
2642 // Non-static data members.
2643 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(),
2644 E = ClassDecl->field_end(); I != E; ++I) {
2645 FieldDecl *Field = *I;
2646 if (Field->isInvalidDecl())
2648 QualType FieldType = Context.getBaseElementType(Field->getType());
2650 const RecordType* RT = FieldType->getAs<RecordType>();
2654 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
2655 if (FieldClassDecl->isInvalidDecl())
2657 if (FieldClassDecl->hasTrivialDestructor())
2660 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl);
2661 assert(Dtor && "No dtor found for FieldClassDecl!");
2662 CheckDestructorAccess(Field->getLocation(), Dtor,
2663 PDiag(diag::err_access_dtor_field)
2664 << Field->getDeclName()
2667 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor));
2670 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases;
2673 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
2674 E = ClassDecl->bases_end(); Base != E; ++Base) {
2675 // Bases are always records in a well-formed non-dependent class.
2676 const RecordType *RT = Base->getType()->getAs<RecordType>();
2678 // Remember direct virtual bases.
2679 if (Base->isVirtual())
2680 DirectVirtualBases.insert(RT);
2682 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
2683 // If our base class is invalid, we probably can't get its dtor anyway.
2684 if (BaseClassDecl->isInvalidDecl())
2686 // Ignore trivial destructors.
2687 if (BaseClassDecl->hasTrivialDestructor())
2690 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
2691 assert(Dtor && "No dtor found for BaseClassDecl!");
2693 // FIXME: caret should be on the start of the class name
2694 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor,
2695 PDiag(diag::err_access_dtor_base)
2697 << Base->getSourceRange());
2699 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor));
2703 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(),
2704 E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
2706 // Bases are always records in a well-formed non-dependent class.
2707 const RecordType *RT = VBase->getType()->getAs<RecordType>();
2709 // Ignore direct virtual bases.
2710 if (DirectVirtualBases.count(RT))
2713 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
2714 // If our base class is invalid, we probably can't get its dtor anyway.
2715 if (BaseClassDecl->isInvalidDecl())
2717 // Ignore trivial destructors.
2718 if (BaseClassDecl->hasTrivialDestructor())
2721 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
2722 assert(Dtor && "No dtor found for BaseClassDecl!");
2723 CheckDestructorAccess(ClassDecl->getLocation(), Dtor,
2724 PDiag(diag::err_access_dtor_vbase)
2725 << VBase->getType());
2727 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor));
2731 void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) {
2735 if (CXXConstructorDecl *Constructor
2736 = dyn_cast<CXXConstructorDecl>(CDtorDecl))
2737 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false);
2740 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
2741 unsigned DiagID, AbstractDiagSelID SelID) {
2743 return RequireNonAbstractType(Loc, T, PDiag(DiagID));
2745 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID);
2748 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
2749 const PartialDiagnostic &PD) {
2750 if (!getLangOptions().CPlusPlus)
2753 if (const ArrayType *AT = Context.getAsArrayType(T))
2754 return RequireNonAbstractType(Loc, AT->getElementType(), PD);
2756 if (const PointerType *PT = T->getAs<PointerType>()) {
2757 // Find the innermost pointer type.
2758 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>())
2761 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType()))
2762 return RequireNonAbstractType(Loc, AT->getElementType(), PD);
2765 const RecordType *RT = T->getAs<RecordType>();
2769 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
2771 // We can't answer whether something is abstract until it has a
2772 // definition. If it's currently being defined, we'll walk back
2773 // over all the declarations when we have a full definition.
2774 const CXXRecordDecl *Def = RD->getDefinition();
2775 if (!Def || Def->isBeingDefined())
2778 if (!RD->isAbstract())
2781 Diag(Loc, PD) << RD->getDeclName();
2782 DiagnoseAbstractType(RD);
2787 void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) {
2788 // Check if we've already emitted the list of pure virtual functions
2790 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD))
2793 CXXFinalOverriderMap FinalOverriders;
2794 RD->getFinalOverriders(FinalOverriders);
2796 // Keep a set of seen pure methods so we won't diagnose the same method
2798 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods;
2800 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
2801 MEnd = FinalOverriders.end();
2804 for (OverridingMethods::iterator SO = M->second.begin(),
2805 SOEnd = M->second.end();
2806 SO != SOEnd; ++SO) {
2807 // C++ [class.abstract]p4:
2808 // A class is abstract if it contains or inherits at least one
2809 // pure virtual function for which the final overrider is pure
2813 if (SO->second.size() != 1)
2816 if (!SO->second.front().Method->isPure())
2819 if (!SeenPureMethods.insert(SO->second.front().Method))
2822 Diag(SO->second.front().Method->getLocation(),
2823 diag::note_pure_virtual_function)
2824 << SO->second.front().Method->getDeclName() << RD->getDeclName();
2828 if (!PureVirtualClassDiagSet)
2829 PureVirtualClassDiagSet.reset(new RecordDeclSetTy);
2830 PureVirtualClassDiagSet->insert(RD);
2834 struct AbstractUsageInfo {
2836 CXXRecordDecl *Record;
2837 CanQualType AbstractType;
2840 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record)
2841 : S(S), Record(Record),
2842 AbstractType(S.Context.getCanonicalType(
2843 S.Context.getTypeDeclType(Record))),
2846 void DiagnoseAbstractType() {
2847 if (Invalid) return;
2848 S.DiagnoseAbstractType(Record);
2852 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel);
2855 struct CheckAbstractUsage {
2856 AbstractUsageInfo &Info;
2857 const NamedDecl *Ctx;
2859 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx)
2860 : Info(Info), Ctx(Ctx) {}
2862 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
2863 switch (TL.getTypeLocClass()) {
2864 #define ABSTRACT_TYPELOC(CLASS, PARENT)
2865 #define TYPELOC(CLASS, PARENT) \
2866 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break;
2867 #include "clang/AST/TypeLocNodes.def"
2871 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) {
2872 Visit(TL.getResultLoc(), Sema::AbstractReturnType);
2873 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
2877 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo();
2878 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType);
2882 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) {
2883 Visit(TL.getElementLoc(), Sema::AbstractArrayType);
2886 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) {
2887 // Visit the type parameters from a permissive context.
2888 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
2889 TemplateArgumentLoc TAL = TL.getArgLoc(I);
2890 if (TAL.getArgument().getKind() == TemplateArgument::Type)
2891 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo())
2892 Visit(TSI->getTypeLoc(), Sema::AbstractNone);
2893 // TODO: other template argument types?
2897 // Visit pointee types from a permissive context.
2898 #define CheckPolymorphic(Type) \
2899 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \
2900 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \
2902 CheckPolymorphic(PointerTypeLoc)
2903 CheckPolymorphic(ReferenceTypeLoc)
2904 CheckPolymorphic(MemberPointerTypeLoc)
2905 CheckPolymorphic(BlockPointerTypeLoc)
2907 /// Handle all the types we haven't given a more specific
2908 /// implementation for above.
2909 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
2910 // Every other kind of type that we haven't called out already
2911 // that has an inner type is either (1) sugar or (2) contains that
2912 // inner type in some way as a subobject.
2913 if (TypeLoc Next = TL.getNextTypeLoc())
2914 return Visit(Next, Sel);
2916 // If there's no inner type and we're in a permissive context,
2918 if (Sel == Sema::AbstractNone) return;
2920 // Check whether the type matches the abstract type.
2921 QualType T = TL.getType();
2922 if (T->isArrayType()) {
2923 Sel = Sema::AbstractArrayType;
2924 T = Info.S.Context.getBaseElementType(T);
2926 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType();
2927 if (CT != Info.AbstractType) return;
2929 // It matched; do some magic.
2930 if (Sel == Sema::AbstractArrayType) {
2931 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type)
2932 << T << TL.getSourceRange();
2934 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl)
2935 << Sel << T << TL.getSourceRange();
2937 Info.DiagnoseAbstractType();
2941 void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL,
2942 Sema::AbstractDiagSelID Sel) {
2943 CheckAbstractUsage(*this, D).Visit(TL, Sel);
2948 /// Check for invalid uses of an abstract type in a method declaration.
2949 static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
2950 CXXMethodDecl *MD) {
2951 // No need to do the check on definitions, which require that
2952 // the return/param types be complete.
2953 if (MD->doesThisDeclarationHaveABody())
2956 // For safety's sake, just ignore it if we don't have type source
2957 // information. This should never happen for non-implicit methods,
2959 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
2960 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone);
2963 /// Check for invalid uses of an abstract type within a class definition.
2964 static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
2965 CXXRecordDecl *RD) {
2966 for (CXXRecordDecl::decl_iterator
2967 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) {
2969 if (D->isImplicit()) continue;
2971 // Methods and method templates.
2972 if (isa<CXXMethodDecl>(D)) {
2973 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D));
2974 } else if (isa<FunctionTemplateDecl>(D)) {
2975 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl();
2976 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD));
2978 // Fields and static variables.
2979 } else if (isa<FieldDecl>(D)) {
2980 FieldDecl *FD = cast<FieldDecl>(D);
2981 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo())
2982 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType);
2983 } else if (isa<VarDecl>(D)) {
2984 VarDecl *VD = cast<VarDecl>(D);
2985 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo())
2986 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType);
2988 // Nested classes and class templates.
2989 } else if (isa<CXXRecordDecl>(D)) {
2990 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D));
2991 } else if (isa<ClassTemplateDecl>(D)) {
2992 CheckAbstractClassUsage(Info,
2993 cast<ClassTemplateDecl>(D)->getTemplatedDecl());
2998 /// \brief Perform semantic checks on a class definition that has been
2999 /// completing, introducing implicitly-declared members, checking for
3000 /// abstract types, etc.
3001 void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) {
3005 if (Record->isAbstract() && !Record->isInvalidDecl()) {
3006 AbstractUsageInfo Info(*this, Record);
3007 CheckAbstractClassUsage(Info, Record);
3010 // If this is not an aggregate type and has no user-declared constructor,
3011 // complain about any non-static data members of reference or const scalar
3012 // type, since they will never get initializers.
3013 if (!Record->isInvalidDecl() && !Record->isDependentType() &&
3014 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) {
3015 bool Complained = false;
3016 for (RecordDecl::field_iterator F = Record->field_begin(),
3017 FEnd = Record->field_end();
3019 if (F->hasInClassInitializer())
3022 if (F->getType()->isReferenceType() ||
3023 (F->getType().isConstQualified() && F->getType()->isScalarType())) {
3025 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst)
3026 << Record->getTagKind() << Record;
3030 Diag(F->getLocation(), diag::note_refconst_member_not_initialized)
3031 << F->getType()->isReferenceType()
3032 << F->getDeclName();
3037 if (Record->isDynamicClass() && !Record->isDependentType())
3038 DynamicClasses.push_back(Record);
3040 if (Record->getIdentifier()) {
3041 // C++ [class.mem]p13:
3042 // If T is the name of a class, then each of the following shall have a
3043 // name different from T:
3044 // - every member of every anonymous union that is a member of class T.
3046 // C++ [class.mem]p14:
3047 // In addition, if class T has a user-declared constructor (12.1), every
3048 // non-static data member of class T shall have a name different from T.
3049 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName());
3050 R.first != R.second; ++R.first) {
3051 NamedDecl *D = *R.first;
3052 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) ||
3053 isa<IndirectFieldDecl>(D)) {
3054 Diag(D->getLocation(), diag::err_member_name_of_class)
3055 << D->getDeclName();
3061 // Warn if the class has virtual methods but non-virtual public destructor.
3062 if (Record->isPolymorphic() && !Record->isDependentType()) {
3063 CXXDestructorDecl *dtor = Record->getDestructor();
3064 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public))
3065 Diag(dtor ? dtor->getLocation() : Record->getLocation(),
3066 diag::warn_non_virtual_dtor) << Context.getRecordType(Record);
3069 // See if a method overloads virtual methods in a base
3070 /// class without overriding any.
3071 if (!Record->isDependentType()) {
3072 for (CXXRecordDecl::method_iterator M = Record->method_begin(),
3073 MEnd = Record->method_end();
3075 if (!(*M)->isStatic())
3076 DiagnoseHiddenVirtualMethods(Record, *M);
3080 // Declare inherited constructors. We do this eagerly here because:
3081 // - The standard requires an eager diagnostic for conflicting inherited
3082 // constructors from different classes.
3083 // - The lazy declaration of the other implicit constructors is so as to not
3084 // waste space and performance on classes that are not meant to be
3085 // instantiated (e.g. meta-functions). This doesn't apply to classes that
3086 // have inherited constructors.
3087 DeclareInheritedConstructors(Record);
3089 if (!Record->isDependentType())
3090 CheckExplicitlyDefaultedMethods(Record);
3093 void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) {
3094 for (CXXRecordDecl::method_iterator MI = Record->method_begin(),
3095 ME = Record->method_end();
3097 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) {
3098 switch (getSpecialMember(*MI)) {
3099 case CXXDefaultConstructor:
3100 CheckExplicitlyDefaultedDefaultConstructor(
3101 cast<CXXConstructorDecl>(*MI));
3105 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI));
3108 case CXXCopyConstructor:
3109 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI));
3112 case CXXCopyAssignment:
3113 CheckExplicitlyDefaultedCopyAssignment(*MI);
3116 case CXXMoveConstructor:
3117 case CXXMoveAssignment:
3118 Diag(MI->getLocation(), diag::err_defaulted_move_unsupported);
3122 // FIXME: Do moves once they exist
3123 llvm_unreachable("non-special member explicitly defaulted!");
3130 void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) {
3131 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor());
3133 // Whether this was the first-declared instance of the constructor.
3134 // This affects whether we implicitly add an exception spec (and, eventually,
3135 // constexpr). It is also ill-formed to explicitly default a constructor such
3136 // that it would be deleted. (C++0x [decl.fct.def.default])
3137 bool First = CD == CD->getCanonicalDecl();
3139 bool HadError = false;
3140 if (CD->getNumParams() != 0) {
3141 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params)
3142 << CD->getSourceRange();
3146 ImplicitExceptionSpecification Spec
3147 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent());
3148 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
3149 if (EPI.ExceptionSpecType == EST_Delayed) {
3150 // Exception specification depends on some deferred part of the class. We'll
3151 // try again when the class's definition has been fully processed.
3154 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(),
3155 *ExceptionType = Context.getFunctionType(
3156 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>();
3158 if (CtorType->hasExceptionSpec()) {
3159 if (CheckEquivalentExceptionSpec(
3160 PDiag(diag::err_incorrect_defaulted_exception_spec)
3161 << CXXDefaultConstructor,
3163 ExceptionType, SourceLocation(),
3164 CtorType, CD->getLocation())) {
3168 // We set the declaration to have the computed exception spec here.
3169 // We know there are no parameters.
3170 EPI.ExtInfo = CtorType->getExtInfo();
3171 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI));
3175 CD->setInvalidDecl();
3179 if (ShouldDeleteDefaultConstructor(CD)) {
3181 CD->setDeletedAsWritten();
3183 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes)
3184 << CXXDefaultConstructor;
3185 CD->setInvalidDecl();
3190 void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) {
3191 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor());
3193 // Whether this was the first-declared instance of the constructor.
3194 bool First = CD == CD->getCanonicalDecl();
3196 bool HadError = false;
3197 if (CD->getNumParams() != 1) {
3198 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params)
3199 << CD->getSourceRange();
3203 ImplicitExceptionSpecification Spec(Context);
3205 llvm::tie(Spec, Const) =
3206 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent());
3208 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
3209 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(),
3210 *ExceptionType = Context.getFunctionType(
3211 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>();
3213 // Check for parameter type matching.
3214 // This is a copy ctor so we know it's a cv-qualified reference to T.
3215 QualType ArgType = CtorType->getArgType(0);
3216 if (ArgType->getPointeeType().isVolatileQualified()) {
3217 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param);
3220 if (ArgType->getPointeeType().isConstQualified() && !Const) {
3221 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param);
3225 if (CtorType->hasExceptionSpec()) {
3226 if (CheckEquivalentExceptionSpec(
3227 PDiag(diag::err_incorrect_defaulted_exception_spec)
3228 << CXXCopyConstructor,
3230 ExceptionType, SourceLocation(),
3231 CtorType, CD->getLocation())) {
3235 // We set the declaration to have the computed exception spec here.
3236 // We duplicate the one parameter type.
3237 EPI.ExtInfo = CtorType->getExtInfo();
3238 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI));
3242 CD->setInvalidDecl();
3246 if (ShouldDeleteCopyConstructor(CD)) {
3248 CD->setDeletedAsWritten();
3250 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes)
3251 << CXXCopyConstructor;
3252 CD->setInvalidDecl();
3257 void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) {
3258 assert(MD->isExplicitlyDefaulted());
3260 // Whether this was the first-declared instance of the operator
3261 bool First = MD == MD->getCanonicalDecl();
3263 bool HadError = false;
3264 if (MD->getNumParams() != 1) {
3265 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params)
3266 << MD->getSourceRange();
3270 QualType ReturnType =
3271 MD->getType()->getAs<FunctionType>()->getResultType();
3272 if (!ReturnType->isLValueReferenceType() ||
3273 !Context.hasSameType(
3274 Context.getCanonicalType(ReturnType->getPointeeType()),
3275 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) {
3276 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type);
3280 ImplicitExceptionSpecification Spec(Context);
3282 llvm::tie(Spec, Const) =
3283 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent());
3285 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
3286 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(),
3287 *ExceptionType = Context.getFunctionType(
3288 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>();
3290 QualType ArgType = OperType->getArgType(0);
3291 if (!ArgType->isReferenceType()) {
3292 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref);
3295 if (ArgType->getPointeeType().isVolatileQualified()) {
3296 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param);
3299 if (ArgType->getPointeeType().isConstQualified() && !Const) {
3300 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param);
3305 if (OperType->getTypeQuals()) {
3306 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals);
3310 if (OperType->hasExceptionSpec()) {
3311 if (CheckEquivalentExceptionSpec(
3312 PDiag(diag::err_incorrect_defaulted_exception_spec)
3313 << CXXCopyAssignment,
3315 ExceptionType, SourceLocation(),
3316 OperType, MD->getLocation())) {
3320 // We set the declaration to have the computed exception spec here.
3321 // We duplicate the one parameter type.
3322 EPI.RefQualifier = OperType->getRefQualifier();
3323 EPI.ExtInfo = OperType->getExtInfo();
3324 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI));
3328 MD->setInvalidDecl();
3332 if (ShouldDeleteCopyAssignmentOperator(MD)) {
3334 MD->setDeletedAsWritten();
3336 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes)
3337 << CXXCopyAssignment;
3338 MD->setInvalidDecl();
3343 void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) {
3344 assert(DD->isExplicitlyDefaulted());
3346 // Whether this was the first-declared instance of the destructor.
3347 bool First = DD == DD->getCanonicalDecl();
3349 ImplicitExceptionSpecification Spec
3350 = ComputeDefaultedDtorExceptionSpec(DD->getParent());
3351 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
3352 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(),
3353 *ExceptionType = Context.getFunctionType(
3354 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>();
3356 if (DtorType->hasExceptionSpec()) {
3357 if (CheckEquivalentExceptionSpec(
3358 PDiag(diag::err_incorrect_defaulted_exception_spec)
3361 ExceptionType, SourceLocation(),
3362 DtorType, DD->getLocation())) {
3363 DD->setInvalidDecl();
3367 // We set the declaration to have the computed exception spec here.
3368 // There are no parameters.
3369 EPI.ExtInfo = DtorType->getExtInfo();
3370 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI));
3373 if (ShouldDeleteDestructor(DD)) {
3375 DD->setDeletedAsWritten();
3377 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes)
3379 DD->setInvalidDecl();
3384 bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) {
3385 CXXRecordDecl *RD = CD->getParent();
3386 assert(!RD->isDependentType() && "do deletion after instantiation");
3387 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl())
3390 SourceLocation Loc = CD->getLocation();
3392 // Do access control from the constructor
3393 ContextRAII CtorContext(*this, CD);
3395 bool Union = RD->isUnion();
3396 bool AllConst = true;
3398 // We do this because we should never actually use an anonymous
3399 // union's constructor.
3400 if (Union && RD->isAnonymousStructOrUnion())
3403 // FIXME: We should put some diagnostic logic right into this function.
3405 // C++0x [class.ctor]/5
3406 // A defaulted default constructor for class X is defined as deleted if:
3408 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(),
3409 BE = RD->bases_end();
3411 // We'll handle this one later
3412 if (BI->isVirtual())
3415 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl();
3416 assert(BaseDecl && "base isn't a CXXRecordDecl");
3418 // -- any [direct base class] has a type with a destructor that is
3419 // deleted or inaccessible from the defaulted default constructor
3420 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl);
3421 if (BaseDtor->isDeleted())
3423 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) !=
3427 // -- any [direct base class either] has no default constructor or
3428 // overload resolution as applied to [its] default constructor
3429 // results in an ambiguity or in a function that is deleted or
3430 // inaccessible from the defaulted default constructor
3431 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl);
3432 if (!BaseDefault || BaseDefault->isDeleted())
3435 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(),
3436 PDiag()) != AR_accessible)
3440 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(),
3441 BE = RD->vbases_end();
3443 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl();
3444 assert(BaseDecl && "base isn't a CXXRecordDecl");
3446 // -- any [virtual base class] has a type with a destructor that is
3447 // delete or inaccessible from the defaulted default constructor
3448 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl);
3449 if (BaseDtor->isDeleted())
3451 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) !=
3455 // -- any [virtual base class either] has no default constructor or
3456 // overload resolution as applied to [its] default constructor
3457 // results in an ambiguity or in a function that is deleted or
3458 // inaccessible from the defaulted default constructor
3459 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl);
3460 if (!BaseDefault || BaseDefault->isDeleted())
3463 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(),
3464 PDiag()) != AR_accessible)
3468 for (CXXRecordDecl::field_iterator FI = RD->field_begin(),
3469 FE = RD->field_end();
3471 if (FI->isInvalidDecl())
3474 QualType FieldType = Context.getBaseElementType(FI->getType());
3475 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl();
3477 // -- any non-static data member with no brace-or-equal-initializer is of
3479 if (FieldType->isReferenceType() && !FI->hasInClassInitializer())
3482 // -- X is a union and all its variant members are of const-qualified type
3483 // (or array thereof)
3484 if (Union && !FieldType.isConstQualified())
3488 // -- X is a union-like class that has a variant member with a non-trivial
3489 // default constructor
3490 if (Union && !FieldRecord->hasTrivialDefaultConstructor())
3493 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord);
3494 if (FieldDtor->isDeleted())
3496 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) !=
3500 // -- any non-variant non-static data member of const-qualified type (or
3501 // array thereof) with no brace-or-equal-initializer does not have a
3502 // user-provided default constructor
3503 if (FieldType.isConstQualified() &&
3504 !FI->hasInClassInitializer() &&
3505 !FieldRecord->hasUserProvidedDefaultConstructor())
3508 if (!Union && FieldRecord->isUnion() &&
3509 FieldRecord->isAnonymousStructOrUnion()) {
3510 // We're okay to reuse AllConst here since we only care about the
3511 // value otherwise if we're in a union.
3514 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(),
3515 UE = FieldRecord->field_end();
3517 QualType UnionFieldType = Context.getBaseElementType(UI->getType());
3518 CXXRecordDecl *UnionFieldRecord =
3519 UnionFieldType->getAsCXXRecordDecl();
3521 if (!UnionFieldType.isConstQualified())
3524 if (UnionFieldRecord &&
3525 !UnionFieldRecord->hasTrivialDefaultConstructor())
3532 // Don't try to initialize the anonymous union
3533 // This is technically non-conformant, but sanity demands it.
3537 // -- any non-static data member with no brace-or-equal-initializer has
3538 // class type M (or array thereof) and either M has no default
3539 // constructor or overload resolution as applied to M's default
3540 // constructor results in an ambiguity or in a function that is deleted
3541 // or inaccessible from the defaulted default constructor.
3542 if (!FI->hasInClassInitializer()) {
3543 CXXConstructorDecl *FieldDefault = LookupDefaultConstructor(FieldRecord);
3544 if (!FieldDefault || FieldDefault->isDeleted())
3546 if (CheckConstructorAccess(Loc, FieldDefault, FieldDefault->getAccess(),
3547 PDiag()) != AR_accessible)
3550 } else if (!Union && FieldType.isConstQualified() &&
3551 !FI->hasInClassInitializer()) {
3552 // -- any non-variant non-static data member of const-qualified type (or
3553 // array thereof) with no brace-or-equal-initializer does not have a
3554 // user-provided default constructor
3559 if (Union && AllConst)
3565 bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) {
3566 CXXRecordDecl *RD = CD->getParent();
3567 assert(!RD->isDependentType() && "do deletion after instantiation");
3568 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl())
3571 SourceLocation Loc = CD->getLocation();
3573 // Do access control from the constructor
3574 ContextRAII CtorContext(*this, CD);
3576 bool Union = RD->isUnion();
3578 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() &&
3579 "copy assignment arg has no pointee type");
3581 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ?
3582 Qualifiers::Const : 0;
3584 // We do this because we should never actually use an anonymous
3585 // union's constructor.
3586 if (Union && RD->isAnonymousStructOrUnion())
3589 // FIXME: We should put some diagnostic logic right into this function.
3591 // C++0x [class.copy]/11
3592 // A defaulted [copy] constructor for class X is defined as delete if X has:
3594 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(),
3595 BE = RD->bases_end();
3597 // We'll handle this one later
3598 if (BI->isVirtual())
3601 QualType BaseType = BI->getType();
3602 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl();
3603 assert(BaseDecl && "base isn't a CXXRecordDecl");
3605 // -- any [direct base class] of a type with a destructor that is deleted or
3606 // inaccessible from the defaulted constructor
3607 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl);
3608 if (BaseDtor->isDeleted())
3610 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) !=
3614 // -- a [direct base class] B that cannot be [copied] because overload
3615 // resolution, as applied to B's [copy] constructor, results in an
3616 // ambiguity or a function that is deleted or inaccessible from the
3617 // defaulted constructor
3618 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals);
3619 if (!BaseCtor || BaseCtor->isDeleted())
3621 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) !=
3626 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(),
3627 BE = RD->vbases_end();
3629 QualType BaseType = BI->getType();
3630 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl();
3631 assert(BaseDecl && "base isn't a CXXRecordDecl");
3633 // -- any [virtual base class] of a type with a destructor that is deleted or
3634 // inaccessible from the defaulted constructor
3635 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl);
3636 if (BaseDtor->isDeleted())
3638 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) !=
3642 // -- a [virtual base class] B that cannot be [copied] because overload
3643 // resolution, as applied to B's [copy] constructor, results in an
3644 // ambiguity or a function that is deleted or inaccessible from the
3645 // defaulted constructor
3646 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals);
3647 if (!BaseCtor || BaseCtor->isDeleted())
3649 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) !=
3654 for (CXXRecordDecl::field_iterator FI = RD->field_begin(),
3655 FE = RD->field_end();
3657 QualType FieldType = Context.getBaseElementType(FI->getType());
3659 // -- for a copy constructor, a non-static data member of rvalue reference
3661 if (FieldType->isRValueReferenceType())
3664 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl();
3667 // This is an anonymous union
3668 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) {
3669 // Anonymous unions inside unions do not variant members create
3671 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(),
3672 UE = FieldRecord->field_end();
3674 QualType UnionFieldType = Context.getBaseElementType(UI->getType());
3675 CXXRecordDecl *UnionFieldRecord =
3676 UnionFieldType->getAsCXXRecordDecl();
3678 // -- a variant member with a non-trivial [copy] constructor and X
3679 // is a union-like class
3680 if (UnionFieldRecord &&
3681 !UnionFieldRecord->hasTrivialCopyConstructor())
3686 // Don't try to initalize an anonymous union
3689 // -- a variant member with a non-trivial [copy] constructor and X is a
3691 if (Union && !FieldRecord->hasTrivialCopyConstructor())
3694 // -- any [non-static data member] of a type with a destructor that is
3695 // deleted or inaccessible from the defaulted constructor
3696 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord);
3697 if (FieldDtor->isDeleted())
3699 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) !=
3704 // -- a [non-static data member of class type (or array thereof)] B that
3705 // cannot be [copied] because overload resolution, as applied to B's
3706 // [copy] constructor, results in an ambiguity or a function that is
3707 // deleted or inaccessible from the defaulted constructor
3708 CXXConstructorDecl *FieldCtor = LookupCopyingConstructor(FieldRecord,
3710 if (!FieldCtor || FieldCtor->isDeleted())
3712 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(),
3713 PDiag()) != AR_accessible)
3721 bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) {
3722 CXXRecordDecl *RD = MD->getParent();
3723 assert(!RD->isDependentType() && "do deletion after instantiation");
3724 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl())
3727 SourceLocation Loc = MD->getLocation();
3729 // Do access control from the constructor
3730 ContextRAII MethodContext(*this, MD);
3732 bool Union = RD->isUnion();
3735 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ?
3736 Qualifiers::Const : 0;
3738 // We do this because we should never actually use an anonymous
3739 // union's constructor.
3740 if (Union && RD->isAnonymousStructOrUnion())
3743 // FIXME: We should put some diagnostic logic right into this function.
3745 // C++0x [class.copy]/11
3746 // A defaulted [copy] assignment operator for class X is defined as deleted
3749 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(),
3750 BE = RD->bases_end();
3752 // We'll handle this one later
3753 if (BI->isVirtual())
3756 QualType BaseType = BI->getType();
3757 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl();
3758 assert(BaseDecl && "base isn't a CXXRecordDecl");
3760 // -- a [direct base class] B that cannot be [copied] because overload
3761 // resolution, as applied to B's [copy] assignment operator, results in
3762 // an ambiguity or a function that is deleted or inaccessible from the
3763 // assignment operator
3764 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false,
3766 if (!CopyOper || CopyOper->isDeleted())
3768 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible)
3772 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(),
3773 BE = RD->vbases_end();
3775 QualType BaseType = BI->getType();
3776 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl();
3777 assert(BaseDecl && "base isn't a CXXRecordDecl");
3779 // -- a [virtual base class] B that cannot be [copied] because overload
3780 // resolution, as applied to B's [copy] assignment operator, results in
3781 // an ambiguity or a function that is deleted or inaccessible from the
3782 // assignment operator
3783 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false,
3785 if (!CopyOper || CopyOper->isDeleted())
3787 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible)
3791 for (CXXRecordDecl::field_iterator FI = RD->field_begin(),
3792 FE = RD->field_end();
3794 QualType FieldType = Context.getBaseElementType(FI->getType());
3796 // -- a non-static data member of reference type
3797 if (FieldType->isReferenceType())
3800 // -- a non-static data member of const non-class type (or array thereof)
3801 if (FieldType.isConstQualified() && !FieldType->isRecordType())
3804 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl();
3807 // This is an anonymous union
3808 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) {
3809 // Anonymous unions inside unions do not variant members create
3811 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(),
3812 UE = FieldRecord->field_end();
3814 QualType UnionFieldType = Context.getBaseElementType(UI->getType());
3815 CXXRecordDecl *UnionFieldRecord =
3816 UnionFieldType->getAsCXXRecordDecl();
3818 // -- a variant member with a non-trivial [copy] assignment operator
3819 // and X is a union-like class
3820 if (UnionFieldRecord &&
3821 !UnionFieldRecord->hasTrivialCopyAssignment())
3826 // Don't try to initalize an anonymous union
3828 // -- a variant member with a non-trivial [copy] assignment operator
3829 // and X is a union-like class
3830 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) {
3834 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals,
3836 if (!CopyOper || CopyOper->isDeleted())
3838 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible)
3846 bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) {
3847 CXXRecordDecl *RD = DD->getParent();
3848 assert(!RD->isDependentType() && "do deletion after instantiation");
3849 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl())
3852 SourceLocation Loc = DD->getLocation();
3854 // Do access control from the destructor
3855 ContextRAII CtorContext(*this, DD);
3857 bool Union = RD->isUnion();
3859 // We do this because we should never actually use an anonymous
3860 // union's destructor.
3861 if (Union && RD->isAnonymousStructOrUnion())
3864 // C++0x [class.dtor]p5
3865 // A defaulted destructor for a class X is defined as deleted if:
3866 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(),
3867 BE = RD->bases_end();
3869 // We'll handle this one later
3870 if (BI->isVirtual())
3873 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl();
3874 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl);
3875 assert(BaseDtor && "base has no destructor");
3877 // -- any direct or virtual base class has a deleted destructor or
3878 // a destructor that is inaccessible from the defaulted destructor
3879 if (BaseDtor->isDeleted())
3881 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) !=
3886 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(),
3887 BE = RD->vbases_end();
3889 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl();
3890 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl);
3891 assert(BaseDtor && "base has no destructor");
3893 // -- any direct or virtual base class has a deleted destructor or
3894 // a destructor that is inaccessible from the defaulted destructor
3895 if (BaseDtor->isDeleted())
3897 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) !=
3902 for (CXXRecordDecl::field_iterator FI = RD->field_begin(),
3903 FE = RD->field_end();
3905 QualType FieldType = Context.getBaseElementType(FI->getType());
3906 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl();
3908 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) {
3909 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(),
3910 UE = FieldRecord->field_end();
3912 QualType UnionFieldType = Context.getBaseElementType(FI->getType());
3913 CXXRecordDecl *UnionFieldRecord =
3914 UnionFieldType->getAsCXXRecordDecl();
3916 // -- X is a union-like class that has a variant member with a non-
3917 // trivial destructor.
3918 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor())
3921 // Technically we are supposed to do this next check unconditionally.
3922 // But that makes absolutely no sense.
3924 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord);
3926 // -- any of the non-static data members has class type M (or array
3927 // thereof) and M has a deleted destructor or a destructor that is
3928 // inaccessible from the defaulted destructor
3929 if (FieldDtor->isDeleted())
3931 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) !=
3935 // -- X is a union-like class that has a variant member with a non-
3936 // trivial destructor.
3937 if (Union && !FieldDtor->isTrivial())
3943 if (DD->isVirtual()) {
3944 FunctionDecl *OperatorDelete = 0;
3945 DeclarationName Name =
3946 Context.DeclarationNames.getCXXOperatorName(OO_Delete);
3947 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete,
3956 /// \brief Data used with FindHiddenVirtualMethod
3958 struct FindHiddenVirtualMethodData {
3960 CXXMethodDecl *Method;
3961 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods;
3962 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
3966 /// \brief Member lookup function that determines whether a given C++
3967 /// method overloads virtual methods in a base class without overriding any,
3968 /// to be used with CXXRecordDecl::lookupInBases().
3969 static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier,
3972 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
3974 FindHiddenVirtualMethodData &Data
3975 = *static_cast<FindHiddenVirtualMethodData*>(UserData);
3977 DeclarationName Name = Data.Method->getDeclName();
3978 assert(Name.getNameKind() == DeclarationName::Identifier);
3980 bool foundSameNameMethod = false;
3981 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods;
3982 for (Path.Decls = BaseRecord->lookup(Name);
3983 Path.Decls.first != Path.Decls.second;
3984 ++Path.Decls.first) {
3985 NamedDecl *D = *Path.Decls.first;
3986 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
3987 MD = MD->getCanonicalDecl();
3988 foundSameNameMethod = true;
3989 // Interested only in hidden virtual methods.
3990 if (!MD->isVirtual())
3992 // If the method we are checking overrides a method from its base
3993 // don't warn about the other overloaded methods.
3994 if (!Data.S->IsOverload(Data.Method, MD, false))
3996 // Collect the overload only if its hidden.
3997 if (!Data.OverridenAndUsingBaseMethods.count(MD))
3998 overloadedMethods.push_back(MD);
4002 if (foundSameNameMethod)
4003 Data.OverloadedMethods.append(overloadedMethods.begin(),
4004 overloadedMethods.end());
4005 return foundSameNameMethod;
4008 /// \brief See if a method overloads virtual methods in a base class without
4010 void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
4011 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual,
4012 MD->getLocation()) == Diagnostic::Ignored)
4014 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier)
4017 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases.
4018 /*bool RecordPaths=*/false,
4019 /*bool DetectVirtual=*/false);
4020 FindHiddenVirtualMethodData Data;
4024 // Keep the base methods that were overriden or introduced in the subclass
4025 // by 'using' in a set. A base method not in this set is hidden.
4026 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName());
4027 res.first != res.second; ++res.first) {
4028 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first))
4029 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
4030 E = MD->end_overridden_methods();
4032 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl());
4033 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first))
4034 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl()))
4035 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl());
4038 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) &&
4039 !Data.OverloadedMethods.empty()) {
4040 Diag(MD->getLocation(), diag::warn_overloaded_virtual)
4041 << MD << (Data.OverloadedMethods.size() > 1);
4043 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) {
4044 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i];
4045 Diag(overloadedMD->getLocation(),
4046 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD;
4051 void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
4053 SourceLocation LBrac,
4054 SourceLocation RBrac,
4055 AttributeList *AttrList) {
4059 AdjustDeclIfTemplate(TagDecl);
4061 ActOnFields(S, RLoc, TagDecl,
4062 // strict aliasing violation!
4063 reinterpret_cast<Decl**>(FieldCollector->getCurFields()),
4064 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList);
4066 CheckCompletedCXXClass(
4067 dyn_cast_or_null<CXXRecordDecl>(TagDecl));
4070 /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
4071 /// special functions, such as the default constructor, copy
4072 /// constructor, or destructor, to the given C++ class (C++
4073 /// [special]p1). This routine can only be executed just before the
4074 /// definition of the class is complete.
4075 void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
4076 if (!ClassDecl->hasUserDeclaredConstructor())
4077 ++ASTContext::NumImplicitDefaultConstructors;
4079 if (!ClassDecl->hasUserDeclaredCopyConstructor())
4080 ++ASTContext::NumImplicitCopyConstructors;
4082 if (!ClassDecl->hasUserDeclaredCopyAssignment()) {
4083 ++ASTContext::NumImplicitCopyAssignmentOperators;
4085 // If we have a dynamic class, then the copy assignment operator may be
4086 // virtual, so we have to declare it immediately. This ensures that, e.g.,
4087 // it shows up in the right place in the vtable and that we diagnose
4088 // problems with the implicit exception specification.
4089 if (ClassDecl->isDynamicClass())
4090 DeclareImplicitCopyAssignment(ClassDecl);
4093 if (!ClassDecl->hasUserDeclaredDestructor()) {
4094 ++ASTContext::NumImplicitDestructors;
4096 // If we have a dynamic class, then the destructor may be virtual, so we
4097 // have to declare the destructor immediately. This ensures that, e.g., it
4098 // shows up in the right place in the vtable and that we diagnose problems
4099 // with the implicit exception specification.
4100 if (ClassDecl->isDynamicClass())
4101 DeclareImplicitDestructor(ClassDecl);
4105 void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) {
4109 int NumParamList = D->getNumTemplateParameterLists();
4110 for (int i = 0; i < NumParamList; i++) {
4111 TemplateParameterList* Params = D->getTemplateParameterList(i);
4112 for (TemplateParameterList::iterator Param = Params->begin(),
4113 ParamEnd = Params->end();
4114 Param != ParamEnd; ++Param) {
4115 NamedDecl *Named = cast<NamedDecl>(*Param);
4116 if (Named->getDeclName()) {
4118 IdResolver.AddDecl(Named);
4124 void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) {
4128 TemplateParameterList *Params = 0;
4129 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D))
4130 Params = Template->getTemplateParameters();
4131 else if (ClassTemplatePartialSpecializationDecl *PartialSpec
4132 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
4133 Params = PartialSpec->getTemplateParameters();
4137 for (TemplateParameterList::iterator Param = Params->begin(),
4138 ParamEnd = Params->end();
4139 Param != ParamEnd; ++Param) {
4140 NamedDecl *Named = cast<NamedDecl>(*Param);
4141 if (Named->getDeclName()) {
4143 IdResolver.AddDecl(Named);
4148 void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
4149 if (!RecordD) return;
4150 AdjustDeclIfTemplate(RecordD);
4151 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD);
4152 PushDeclContext(S, Record);
4155 void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
4156 if (!RecordD) return;
4160 /// ActOnStartDelayedCXXMethodDeclaration - We have completed
4161 /// parsing a top-level (non-nested) C++ class, and we are now
4162 /// parsing those parts of the given Method declaration that could
4163 /// not be parsed earlier (C++ [class.mem]p2), such as default
4164 /// arguments. This action should enter the scope of the given
4165 /// Method declaration as if we had just parsed the qualified method
4166 /// name. However, it should not bring the parameters into scope;
4167 /// that will be performed by ActOnDelayedCXXMethodParameter.
4168 void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
4171 /// ActOnDelayedCXXMethodParameter - We've already started a delayed
4172 /// C++ method declaration. We're (re-)introducing the given
4173 /// function parameter into scope for use in parsing later parts of
4174 /// the method declaration. For example, we could see an
4175 /// ActOnParamDefaultArgument event for this parameter.
4176 void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) {
4180 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD);
4182 // If this parameter has an unparsed default argument, clear it out
4183 // to make way for the parsed default argument.
4184 if (Param->hasUnparsedDefaultArg())
4185 Param->setDefaultArg(0);
4188 if (Param->getDeclName())
4189 IdResolver.AddDecl(Param);
4192 /// ActOnFinishDelayedCXXMethodDeclaration - We have finished
4193 /// processing the delayed method declaration for Method. The method
4194 /// declaration is now considered finished. There may be a separate
4195 /// ActOnStartOfFunctionDef action later (not necessarily
4196 /// immediately!) for this method, if it was also defined inside the
4198 void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
4202 AdjustDeclIfTemplate(MethodD);
4204 FunctionDecl *Method = cast<FunctionDecl>(MethodD);
4206 // Now that we have our default arguments, check the constructor
4207 // again. It could produce additional diagnostics or affect whether
4208 // the class has implicitly-declared destructors, among other
4210 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method))
4211 CheckConstructor(Constructor);
4213 // Check the default arguments, which we may have added.
4214 if (!Method->isInvalidDecl())
4215 CheckCXXDefaultArguments(Method);
4218 /// CheckConstructorDeclarator - Called by ActOnDeclarator to check
4219 /// the well-formedness of the constructor declarator @p D with type @p
4220 /// R. If there are any errors in the declarator, this routine will
4221 /// emit diagnostics and set the invalid bit to true. In any case, the type
4222 /// will be updated to reflect a well-formed type for the constructor and
4224 QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R,
4226 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
4228 // C++ [class.ctor]p3:
4229 // A constructor shall not be virtual (10.3) or static (9.4). A
4230 // constructor can be invoked for a const, volatile or const
4231 // volatile object. A constructor shall not be declared const,
4232 // volatile, or const volatile (9.3.2).
4234 if (!D.isInvalidType())
4235 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
4236 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc())
4237 << SourceRange(D.getIdentifierLoc());
4240 if (SC == SC_Static) {
4241 if (!D.isInvalidType())
4242 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
4243 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
4244 << SourceRange(D.getIdentifierLoc());
4249 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
4250 if (FTI.TypeQuals != 0) {
4251 if (FTI.TypeQuals & Qualifiers::Const)
4252 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
4253 << "const" << SourceRange(D.getIdentifierLoc());
4254 if (FTI.TypeQuals & Qualifiers::Volatile)
4255 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
4256 << "volatile" << SourceRange(D.getIdentifierLoc());
4257 if (FTI.TypeQuals & Qualifiers::Restrict)
4258 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
4259 << "restrict" << SourceRange(D.getIdentifierLoc());
4263 // C++0x [class.ctor]p4:
4264 // A constructor shall not be declared with a ref-qualifier.
4265 if (FTI.hasRefQualifier()) {
4266 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor)
4267 << FTI.RefQualifierIsLValueRef
4268 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
4272 // Rebuild the function type "R" without any type qualifiers (in
4273 // case any of the errors above fired) and with "void" as the
4274 // return type, since constructors don't have return types.
4275 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
4276 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType())
4279 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
4281 EPI.RefQualifier = RQ_None;
4283 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(),
4284 Proto->getNumArgs(), EPI);
4287 /// CheckConstructor - Checks a fully-formed constructor for
4288 /// well-formedness, issuing any diagnostics required. Returns true if
4289 /// the constructor declarator is invalid.
4290 void Sema::CheckConstructor(CXXConstructorDecl *Constructor) {
4291 CXXRecordDecl *ClassDecl
4292 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext());
4294 return Constructor->setInvalidDecl();
4296 // C++ [class.copy]p3:
4297 // A declaration of a constructor for a class X is ill-formed if
4298 // its first parameter is of type (optionally cv-qualified) X and
4299 // either there are no other parameters or else all other
4300 // parameters have default arguments.
4301 if (!Constructor->isInvalidDecl() &&
4302 ((Constructor->getNumParams() == 1) ||
4303 (Constructor->getNumParams() > 1 &&
4304 Constructor->getParamDecl(1)->hasDefaultArg())) &&
4305 Constructor->getTemplateSpecializationKind()
4306 != TSK_ImplicitInstantiation) {
4307 QualType ParamType = Constructor->getParamDecl(0)->getType();
4308 QualType ClassTy = Context.getTagDeclType(ClassDecl);
4309 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) {
4310 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation();
4311 const char *ConstRef
4312 = Constructor->getParamDecl(0)->getIdentifier() ? "const &"
4314 Diag(ParamLoc, diag::err_constructor_byvalue_arg)
4315 << FixItHint::CreateInsertion(ParamLoc, ConstRef);
4317 // FIXME: Rather that making the constructor invalid, we should endeavor
4319 Constructor->setInvalidDecl();
4324 /// CheckDestructor - Checks a fully-formed destructor definition for
4325 /// well-formedness, issuing any diagnostics required. Returns true
4327 bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) {
4328 CXXRecordDecl *RD = Destructor->getParent();
4330 if (Destructor->isVirtual()) {
4333 if (!Destructor->isImplicit())
4334 Loc = Destructor->getLocation();
4336 Loc = RD->getLocation();
4338 // If we have a virtual destructor, look up the deallocation function
4339 FunctionDecl *OperatorDelete = 0;
4340 DeclarationName Name =
4341 Context.DeclarationNames.getCXXOperatorName(OO_Delete);
4342 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete))
4345 MarkDeclarationReferenced(Loc, OperatorDelete);
4347 Destructor->setOperatorDelete(OperatorDelete);
4354 FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) {
4355 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
4356 FTI.ArgInfo[0].Param &&
4357 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType());
4360 /// CheckDestructorDeclarator - Called by ActOnDeclarator to check
4361 /// the well-formednes of the destructor declarator @p D with type @p
4362 /// R. If there are any errors in the declarator, this routine will
4363 /// emit diagnostics and set the declarator to invalid. Even if this happens,
4364 /// will be updated to reflect a well-formed type for the destructor and
4366 QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R,
4368 // C++ [class.dtor]p1:
4369 // [...] A typedef-name that names a class is a class-name
4370 // (7.1.3); however, a typedef-name that names a class shall not
4371 // be used as the identifier in the declarator for a destructor
4373 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName);
4374 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>())
4375 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
4376 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl());
4377 else if (const TemplateSpecializationType *TST =
4378 DeclaratorType->getAs<TemplateSpecializationType>())
4379 if (TST->isTypeAlias())
4380 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
4381 << DeclaratorType << 1;
4383 // C++ [class.dtor]p2:
4384 // A destructor is used to destroy objects of its class type. A
4385 // destructor takes no parameters, and no return type can be
4386 // specified for it (not even void). The address of a destructor
4387 // shall not be taken. A destructor shall not be static. A
4388 // destructor can be invoked for a const, volatile or const
4389 // volatile object. A destructor shall not be declared const,
4390 // volatile or const volatile (9.3.2).
4391 if (SC == SC_Static) {
4392 if (!D.isInvalidType())
4393 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be)
4394 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
4395 << SourceRange(D.getIdentifierLoc())
4396 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
4400 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
4401 // Destructors don't have return types, but the parser will
4402 // happily parse something like:
4408 // The return type will be eliminated later.
4409 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type)
4410 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
4411 << SourceRange(D.getIdentifierLoc());
4414 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
4415 if (FTI.TypeQuals != 0 && !D.isInvalidType()) {
4416 if (FTI.TypeQuals & Qualifiers::Const)
4417 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
4418 << "const" << SourceRange(D.getIdentifierLoc());
4419 if (FTI.TypeQuals & Qualifiers::Volatile)
4420 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
4421 << "volatile" << SourceRange(D.getIdentifierLoc());
4422 if (FTI.TypeQuals & Qualifiers::Restrict)
4423 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
4424 << "restrict" << SourceRange(D.getIdentifierLoc());
4428 // C++0x [class.dtor]p2:
4429 // A destructor shall not be declared with a ref-qualifier.
4430 if (FTI.hasRefQualifier()) {
4431 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor)
4432 << FTI.RefQualifierIsLValueRef
4433 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
4437 // Make sure we don't have any parameters.
4438 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) {
4439 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params);
4441 // Delete the parameters.
4446 // Make sure the destructor isn't variadic.
4447 if (FTI.isVariadic) {
4448 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic);
4452 // Rebuild the function type "R" without any type qualifiers or
4453 // parameters (in case any of the errors above fired) and with
4454 // "void" as the return type, since destructors don't have return
4456 if (!D.isInvalidType())
4459 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
4460 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
4461 EPI.Variadic = false;
4463 EPI.RefQualifier = RQ_None;
4464 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI);
4467 /// CheckConversionDeclarator - Called by ActOnDeclarator to check the
4468 /// well-formednes of the conversion function declarator @p D with
4469 /// type @p R. If there are any errors in the declarator, this routine
4470 /// will emit diagnostics and return true. Otherwise, it will return
4471 /// false. Either way, the type @p R will be updated to reflect a
4472 /// well-formed type for the conversion operator.
4473 void Sema::CheckConversionDeclarator(Declarator &D, QualType &R,
4475 // C++ [class.conv.fct]p1:
4476 // Neither parameter types nor return type can be specified. The
4477 // type of a conversion function (8.3.5) is "function taking no
4478 // parameter returning conversion-type-id."
4479 if (SC == SC_Static) {
4480 if (!D.isInvalidType())
4481 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member)
4482 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
4483 << SourceRange(D.getIdentifierLoc());
4488 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId);
4490 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
4491 // Conversion functions don't have return types, but the parser will
4492 // happily parse something like:
4495 // float operator bool();
4498 // The return type will be changed later anyway.
4499 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type)
4500 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
4501 << SourceRange(D.getIdentifierLoc());
4505 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
4507 // Make sure we don't have any parameters.
4508 if (Proto->getNumArgs() > 0) {
4509 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params);
4511 // Delete the parameters.
4512 D.getFunctionTypeInfo().freeArgs();
4514 } else if (Proto->isVariadic()) {
4515 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic);
4519 // Diagnose "&operator bool()" and other such nonsense. This
4520 // is actually a gcc extension which we don't support.
4521 if (Proto->getResultType() != ConvType) {
4522 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl)
4523 << Proto->getResultType();
4525 ConvType = Proto->getResultType();
4528 // C++ [class.conv.fct]p4:
4529 // The conversion-type-id shall not represent a function type nor
4531 if (ConvType->isArrayType()) {
4532 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array);
4533 ConvType = Context.getPointerType(ConvType);
4535 } else if (ConvType->isFunctionType()) {
4536 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function);
4537 ConvType = Context.getPointerType(ConvType);
4541 // Rebuild the function type "R" without any parameters (in case any
4542 // of the errors above fired) and with the conversion type as the
4544 if (D.isInvalidType())
4545 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo());
4547 // C++0x explicit conversion operators.
4548 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x)
4549 Diag(D.getDeclSpec().getExplicitSpecLoc(),
4550 diag::warn_explicit_conversion_functions)
4551 << SourceRange(D.getDeclSpec().getExplicitSpecLoc());
4554 /// ActOnConversionDeclarator - Called by ActOnDeclarator to complete
4555 /// the declaration of the given C++ conversion function. This routine
4556 /// is responsible for recording the conversion function in the C++
4557 /// class, if possible.
4558 Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) {
4559 assert(Conversion && "Expected to receive a conversion function declaration");
4561 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext());
4563 // Make sure we aren't redeclaring the conversion function.
4564 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType());
4566 // C++ [class.conv.fct]p1:
4567 // [...] A conversion function is never used to convert a
4568 // (possibly cv-qualified) object to the (possibly cv-qualified)
4569 // same object type (or a reference to it), to a (possibly
4570 // cv-qualified) base class of that type (or a reference to it),
4571 // or to (possibly cv-qualified) void.
4572 // FIXME: Suppress this warning if the conversion function ends up being a
4573 // virtual function that overrides a virtual function in a base class.
4575 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
4576 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>())
4577 ConvType = ConvTypeRef->getPointeeType();
4578 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared &&
4579 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization)
4580 /* Suppress diagnostics for instantiations. */;
4581 else if (ConvType->isRecordType()) {
4582 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType();
4583 if (ConvType == ClassType)
4584 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used)
4586 else if (IsDerivedFrom(ClassType, ConvType))
4587 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used)
4588 << ClassType << ConvType;
4589 } else if (ConvType->isVoidType()) {
4590 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used)
4591 << ClassType << ConvType;
4594 if (FunctionTemplateDecl *ConversionTemplate
4595 = Conversion->getDescribedFunctionTemplate())
4596 return ConversionTemplate;
4601 //===----------------------------------------------------------------------===//
4602 // Namespace Handling
4603 //===----------------------------------------------------------------------===//
4607 /// ActOnStartNamespaceDef - This is called at the start of a namespace
4609 Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope,
4610 SourceLocation InlineLoc,
4611 SourceLocation NamespaceLoc,
4612 SourceLocation IdentLoc,
4614 SourceLocation LBrace,
4615 AttributeList *AttrList) {
4616 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc;
4617 // For anonymous namespace, take the location of the left brace.
4618 SourceLocation Loc = II ? IdentLoc : LBrace;
4619 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext,
4621 Namespc->setInline(InlineLoc.isValid());
4623 Scope *DeclRegionScope = NamespcScope->getParent();
4625 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList);
4627 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>())
4628 PushNamespaceVisibilityAttr(Attr);
4631 // C++ [namespace.def]p2:
4632 // The identifier in an original-namespace-definition shall not
4633 // have been previously defined in the declarative region in
4634 // which the original-namespace-definition appears. The
4635 // identifier in an original-namespace-definition is the name of
4636 // the namespace. Subsequently in that declarative region, it is
4637 // treated as an original-namespace-name.
4639 // Since namespace names are unique in their scope, and we don't
4640 // look through using directives, just look for any ordinary names.
4642 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member |
4643 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag |
4644 Decl::IDNS_Namespace;
4645 NamedDecl *PrevDecl = 0;
4646 for (DeclContext::lookup_result R
4647 = CurContext->getRedeclContext()->lookup(II);
4648 R.first != R.second; ++R.first) {
4649 if ((*R.first)->getIdentifierNamespace() & IDNS) {
4650 PrevDecl = *R.first;
4655 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) {
4656 // This is an extended namespace definition.
4657 if (Namespc->isInline() != OrigNS->isInline()) {
4658 // inline-ness must match
4659 if (OrigNS->isInline()) {
4660 // The user probably just forgot the 'inline', so suggest that it
4662 Diag(Namespc->getLocation(),
4663 diag::warn_inline_namespace_reopened_noninline)
4664 << FixItHint::CreateInsertion(NamespaceLoc, "inline ");
4666 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch)
4667 << Namespc->isInline();
4669 Diag(OrigNS->getLocation(), diag::note_previous_definition);
4671 // Recover by ignoring the new namespace's inline status.
4672 Namespc->setInline(OrigNS->isInline());
4675 // Attach this namespace decl to the chain of extended namespace
4677 OrigNS->setNextNamespace(Namespc);
4678 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace());
4680 // Remove the previous declaration from the scope.
4681 if (DeclRegionScope->isDeclScope(OrigNS)) {
4682 IdResolver.RemoveDecl(OrigNS);
4683 DeclRegionScope->RemoveDecl(OrigNS);
4685 } else if (PrevDecl) {
4686 // This is an invalid name redefinition.
4687 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind)
4688 << Namespc->getDeclName();
4689 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
4690 Namespc->setInvalidDecl();
4691 // Continue on to push Namespc as current DeclContext and return it.
4692 } else if (II->isStr("std") &&
4693 CurContext->getRedeclContext()->isTranslationUnit()) {
4694 // This is the first "real" definition of the namespace "std", so update
4695 // our cache of the "std" namespace to point at this definition.
4696 if (NamespaceDecl *StdNS = getStdNamespace()) {
4697 // We had already defined a dummy namespace "std". Link this new
4698 // namespace definition to the dummy namespace "std".
4699 StdNS->setNextNamespace(Namespc);
4700 StdNS->setLocation(IdentLoc);
4701 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace());
4704 // Make our StdNamespace cache point at the first real definition of the
4706 StdNamespace = Namespc;
4708 // Add this instance of "std" to the set of known namespaces
4709 KnownNamespaces[Namespc] = false;
4710 } else if (!Namespc->isInline()) {
4711 // Since this is an "original" namespace, add it to the known set of
4712 // namespaces if it is not an inline namespace.
4713 KnownNamespaces[Namespc] = false;
4716 PushOnScopeChains(Namespc, DeclRegionScope);
4718 // Anonymous namespaces.
4719 assert(Namespc->isAnonymousNamespace());
4721 // Link the anonymous namespace into its parent.
4722 NamespaceDecl *PrevDecl;
4723 DeclContext *Parent = CurContext->getRedeclContext();
4724 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
4725 PrevDecl = TU->getAnonymousNamespace();
4726 TU->setAnonymousNamespace(Namespc);
4728 NamespaceDecl *ND = cast<NamespaceDecl>(Parent);
4729 PrevDecl = ND->getAnonymousNamespace();
4730 ND->setAnonymousNamespace(Namespc);
4733 // Link the anonymous namespace with its previous declaration.
4735 assert(PrevDecl->isAnonymousNamespace());
4736 assert(!PrevDecl->getNextNamespace());
4737 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace());
4738 PrevDecl->setNextNamespace(Namespc);
4740 if (Namespc->isInline() != PrevDecl->isInline()) {
4741 // inline-ness must match
4742 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch)
4743 << Namespc->isInline();
4744 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
4745 Namespc->setInvalidDecl();
4746 // Recover by ignoring the new namespace's inline status.
4747 Namespc->setInline(PrevDecl->isInline());
4751 CurContext->addDecl(Namespc);
4753 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition
4754 // behaves as if it were replaced by
4755 // namespace unique { /* empty body */ }
4756 // using namespace unique;
4757 // namespace unique { namespace-body }
4758 // where all occurrences of 'unique' in a translation unit are
4759 // replaced by the same identifier and this identifier differs
4760 // from all other identifiers in the entire program.
4762 // We just create the namespace with an empty name and then add an
4763 // implicit using declaration, just like the standard suggests.
4765 // CodeGen enforces the "universally unique" aspect by giving all
4766 // declarations semantically contained within an anonymous
4767 // namespace internal linkage.
4770 UsingDirectiveDecl* UD
4771 = UsingDirectiveDecl::Create(Context, CurContext,
4772 /* 'using' */ LBrace,
4773 /* 'namespace' */ SourceLocation(),
4774 /* qualifier */ NestedNameSpecifierLoc(),
4775 /* identifier */ SourceLocation(),
4777 /* Ancestor */ CurContext);
4779 CurContext->addDecl(UD);
4783 // Although we could have an invalid decl (i.e. the namespace name is a
4784 // redefinition), push it as current DeclContext and try to continue parsing.
4785 // FIXME: We should be able to push Namespc here, so that the each DeclContext
4786 // for the namespace has the declarations that showed up in that particular
4787 // namespace definition.
4788 PushDeclContext(NamespcScope, Namespc);
4792 /// getNamespaceDecl - Returns the namespace a decl represents. If the decl
4793 /// is a namespace alias, returns the namespace it points to.
4794 static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) {
4795 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D))
4796 return AD->getNamespace();
4797 return dyn_cast_or_null<NamespaceDecl>(D);
4800 /// ActOnFinishNamespaceDef - This callback is called after a namespace is
4801 /// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef.
4802 void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) {
4803 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl);
4804 assert(Namespc && "Invalid parameter, expected NamespaceDecl");
4805 Namespc->setRBraceLoc(RBrace);
4807 if (Namespc->hasAttr<VisibilityAttr>())
4808 PopPragmaVisibility();
4811 CXXRecordDecl *Sema::getStdBadAlloc() const {
4812 return cast_or_null<CXXRecordDecl>(
4813 StdBadAlloc.get(Context.getExternalSource()));
4816 NamespaceDecl *Sema::getStdNamespace() const {
4817 return cast_or_null<NamespaceDecl>(
4818 StdNamespace.get(Context.getExternalSource()));
4821 /// \brief Retrieve the special "std" namespace, which may require us to
4822 /// implicitly define the namespace.
4823 NamespaceDecl *Sema::getOrCreateStdNamespace() {
4824 if (!StdNamespace) {
4825 // The "std" namespace has not yet been defined, so build one implicitly.
4826 StdNamespace = NamespaceDecl::Create(Context,
4827 Context.getTranslationUnitDecl(),
4828 SourceLocation(), SourceLocation(),
4829 &PP.getIdentifierTable().get("std"));
4830 getStdNamespace()->setImplicit(true);
4833 return getStdNamespace();
4836 /// \brief Determine whether a using statement is in a context where it will be
4837 /// apply in all contexts.
4838 static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) {
4839 switch (CurContext->getDeclKind()) {
4840 case Decl::TranslationUnit:
4842 case Decl::LinkageSpec:
4843 return IsUsingDirectiveInToplevelContext(CurContext->getParent());
4849 static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc,
4851 SourceLocation IdentLoc,
4852 IdentifierInfo *Ident) {
4854 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(),
4855 R.getLookupKind(), Sc, &SS, NULL,
4856 false, S.CTC_NoKeywords, NULL)) {
4857 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() ||
4858 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) {
4859 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions()));
4860 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions()));
4861 if (DeclContext *DC = S.computeDeclContext(SS, false))
4862 S.Diag(IdentLoc, diag::err_using_directive_member_suggest)
4863 << Ident << DC << CorrectedQuotedStr << SS.getRange()
4864 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr);
4866 S.Diag(IdentLoc, diag::err_using_directive_suggest)
4867 << Ident << CorrectedQuotedStr
4868 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr);
4870 S.Diag(Corrected.getCorrectionDecl()->getLocation(),
4871 diag::note_namespace_defined_here) << CorrectedQuotedStr;
4873 Ident = Corrected.getCorrectionAsIdentifierInfo();
4874 R.addDecl(Corrected.getCorrectionDecl());
4877 R.setLookupName(Ident);
4882 Decl *Sema::ActOnUsingDirective(Scope *S,
4883 SourceLocation UsingLoc,
4884 SourceLocation NamespcLoc,
4886 SourceLocation IdentLoc,
4887 IdentifierInfo *NamespcName,
4888 AttributeList *AttrList) {
4889 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
4890 assert(NamespcName && "Invalid NamespcName.");
4891 assert(IdentLoc.isValid() && "Invalid NamespceName location.");
4893 // This can only happen along a recovery path.
4894 while (S->getFlags() & Scope::TemplateParamScope)
4896 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
4898 UsingDirectiveDecl *UDir = 0;
4899 NestedNameSpecifier *Qualifier = 0;
4901 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
4903 // Lookup namespace name.
4904 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName);
4905 LookupParsedName(R, S, &SS);
4906 if (R.isAmbiguous())
4911 // Allow "using namespace std;" or "using namespace ::std;" even if
4912 // "std" hasn't been defined yet, for GCC compatibility.
4913 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) &&
4914 NamespcName->isStr("std")) {
4915 Diag(IdentLoc, diag::ext_using_undefined_std);
4916 R.addDecl(getOrCreateStdNamespace());
4919 // Otherwise, attempt typo correction.
4920 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName);
4924 NamedDecl *Named = R.getFoundDecl();
4925 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named))
4926 && "expected namespace decl");
4927 // C++ [namespace.udir]p1:
4928 // A using-directive specifies that the names in the nominated
4929 // namespace can be used in the scope in which the
4930 // using-directive appears after the using-directive. During
4931 // unqualified name lookup (3.4.1), the names appear as if they
4932 // were declared in the nearest enclosing namespace which
4933 // contains both the using-directive and the nominated
4934 // namespace. [Note: in this context, "contains" means "contains
4935 // directly or indirectly". ]
4937 // Find enclosing context containing both using-directive and
4938 // nominated namespace.
4939 NamespaceDecl *NS = getNamespaceDecl(Named);
4940 DeclContext *CommonAncestor = cast<DeclContext>(NS);
4941 while (CommonAncestor && !CommonAncestor->Encloses(CurContext))
4942 CommonAncestor = CommonAncestor->getParent();
4944 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc,
4945 SS.getWithLocInContext(Context),
4946 IdentLoc, Named, CommonAncestor);
4948 if (IsUsingDirectiveInToplevelContext(CurContext) &&
4949 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) {
4950 Diag(IdentLoc, diag::warn_using_directive_in_header);
4953 PushUsingDirective(S, UDir);
4955 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
4958 // FIXME: We ignore attributes for now.
4962 void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) {
4963 // If scope has associated entity, then using directive is at namespace
4964 // or translation unit scope. We add UsingDirectiveDecls, into
4965 // it's lookup structure.
4966 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()))
4969 // Otherwise it is block-sope. using-directives will affect lookup
4970 // only to the end of scope.
4971 S->PushUsingDirective(UDir);
4975 Decl *Sema::ActOnUsingDeclaration(Scope *S,
4977 bool HasUsingKeyword,
4978 SourceLocation UsingLoc,
4980 UnqualifiedId &Name,
4981 AttributeList *AttrList,
4983 SourceLocation TypenameLoc) {
4984 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
4986 switch (Name.getKind()) {
4987 case UnqualifiedId::IK_ImplicitSelfParam:
4988 case UnqualifiedId::IK_Identifier:
4989 case UnqualifiedId::IK_OperatorFunctionId:
4990 case UnqualifiedId::IK_LiteralOperatorId:
4991 case UnqualifiedId::IK_ConversionFunctionId:
4994 case UnqualifiedId::IK_ConstructorName:
4995 case UnqualifiedId::IK_ConstructorTemplateId:
4996 // C++0x inherited constructors.
4997 if (getLangOptions().CPlusPlus0x) break;
4999 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor)
5003 case UnqualifiedId::IK_DestructorName:
5004 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor)
5008 case UnqualifiedId::IK_TemplateId:
5009 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id)
5010 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc);
5014 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name);
5015 DeclarationName TargetName = TargetNameInfo.getName();
5019 // Warn about using declarations.
5020 // TODO: store that the declaration was written without 'using' and
5021 // talk about access decls instead of using decls in the
5023 if (!HasUsingKeyword) {
5024 UsingLoc = Name.getSourceRange().getBegin();
5026 Diag(UsingLoc, diag::warn_access_decl_deprecated)
5027 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using ");
5030 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) ||
5031 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration))
5034 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS,
5035 TargetNameInfo, AttrList,
5036 /* IsInstantiation */ false,
5037 IsTypeName, TypenameLoc);
5039 PushOnScopeChains(UD, S, /*AddToContext*/ false);
5044 /// \brief Determine whether a using declaration considers the given
5045 /// declarations as "equivalent", e.g., if they are redeclarations of
5046 /// the same entity or are both typedefs of the same type.
5048 IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2,
5049 bool &SuppressRedeclaration) {
5050 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) {
5051 SuppressRedeclaration = false;
5055 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1))
5056 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) {
5057 SuppressRedeclaration = true;
5058 return Context.hasSameType(TD1->getUnderlyingType(),
5059 TD2->getUnderlyingType());
5066 /// Determines whether to create a using shadow decl for a particular
5067 /// decl, given the set of decls existing prior to this using lookup.
5068 bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig,
5069 const LookupResult &Previous) {
5070 // Diagnose finding a decl which is not from a base class of the
5071 // current class. We do this now because there are cases where this
5072 // function will silently decide not to build a shadow decl, which
5073 // will pre-empt further diagnostics.
5075 // We don't need to do this in C++0x because we do the check once on
5078 // FIXME: diagnose the following if we care enough:
5079 // struct A { int foo; };
5080 // struct B : A { using A::foo; };
5081 // template <class T> struct C : A {};
5082 // template <class T> struct D : C<T> { using B::foo; } // <---
5083 // This is invalid (during instantiation) in C++03 because B::foo
5084 // resolves to the using decl in B, which is not a base class of D<T>.
5085 // We can't diagnose it immediately because C<T> is an unknown
5086 // specialization. The UsingShadowDecl in D<T> then points directly
5087 // to A::foo, which will look well-formed when we instantiate.
5088 // The right solution is to not collapse the shadow-decl chain.
5089 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) {
5090 DeclContext *OrigDC = Orig->getDeclContext();
5092 // Handle enums and anonymous structs.
5093 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent();
5094 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC);
5095 while (OrigRec->isAnonymousStructOrUnion())
5096 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext());
5098 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) {
5099 if (OrigDC == CurContext) {
5100 Diag(Using->getLocation(),
5101 diag::err_using_decl_nested_name_specifier_is_current_class)
5102 << Using->getQualifierLoc().getSourceRange();
5103 Diag(Orig->getLocation(), diag::note_using_decl_target);
5107 Diag(Using->getQualifierLoc().getBeginLoc(),
5108 diag::err_using_decl_nested_name_specifier_is_not_base_class)
5109 << Using->getQualifier()
5110 << cast<CXXRecordDecl>(CurContext)
5111 << Using->getQualifierLoc().getSourceRange();
5112 Diag(Orig->getLocation(), diag::note_using_decl_target);
5117 if (Previous.empty()) return false;
5119 NamedDecl *Target = Orig;
5120 if (isa<UsingShadowDecl>(Target))
5121 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
5123 // If the target happens to be one of the previous declarations, we
5124 // don't have a conflict.
5126 // FIXME: but we might be increasing its access, in which case we
5127 // should redeclare it.
5128 NamedDecl *NonTag = 0, *Tag = 0;
5129 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
5131 NamedDecl *D = (*I)->getUnderlyingDecl();
5133 if (IsEquivalentForUsingDecl(Context, D, Target, Result))
5136 (isa<TagDecl>(D) ? Tag : NonTag) = D;
5139 if (Target->isFunctionOrFunctionTemplate()) {
5141 if (isa<FunctionTemplateDecl>(Target))
5142 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl();
5144 FD = cast<FunctionDecl>(Target);
5146 NamedDecl *OldDecl = 0;
5147 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) {
5151 case Ovl_NonFunction:
5152 Diag(Using->getLocation(), diag::err_using_decl_conflict);
5155 // We found a decl with the exact signature.
5157 // If we're in a record, we want to hide the target, so we
5158 // return true (without a diagnostic) to tell the caller not to
5159 // build a shadow decl.
5160 if (CurContext->isRecord())
5163 // If we're not in a record, this is an error.
5164 Diag(Using->getLocation(), diag::err_using_decl_conflict);
5168 Diag(Target->getLocation(), diag::note_using_decl_target);
5169 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict);
5173 // Target is not a function.
5175 if (isa<TagDecl>(Target)) {
5176 // No conflict between a tag and a non-tag.
5177 if (!Tag) return false;
5179 Diag(Using->getLocation(), diag::err_using_decl_conflict);
5180 Diag(Target->getLocation(), diag::note_using_decl_target);
5181 Diag(Tag->getLocation(), diag::note_using_decl_conflict);
5185 // No conflict between a tag and a non-tag.
5186 if (!NonTag) return false;
5188 Diag(Using->getLocation(), diag::err_using_decl_conflict);
5189 Diag(Target->getLocation(), diag::note_using_decl_target);
5190 Diag(NonTag->getLocation(), diag::note_using_decl_conflict);
5194 /// Builds a shadow declaration corresponding to a 'using' declaration.
5195 UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S,
5199 // If we resolved to another shadow declaration, just coalesce them.
5200 NamedDecl *Target = Orig;
5201 if (isa<UsingShadowDecl>(Target)) {
5202 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
5203 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration");
5206 UsingShadowDecl *Shadow
5207 = UsingShadowDecl::Create(Context, CurContext,
5208 UD->getLocation(), UD, Target);
5209 UD->addShadowDecl(Shadow);
5211 Shadow->setAccess(UD->getAccess());
5212 if (Orig->isInvalidDecl() || UD->isInvalidDecl())
5213 Shadow->setInvalidDecl();
5216 PushOnScopeChains(Shadow, S);
5218 CurContext->addDecl(Shadow);
5224 /// Hides a using shadow declaration. This is required by the current
5225 /// using-decl implementation when a resolvable using declaration in a
5226 /// class is followed by a declaration which would hide or override
5227 /// one or more of the using decl's targets; for example:
5229 /// struct Base { void foo(int); };
5230 /// struct Derived : Base {
5231 /// using Base::foo;
5235 /// The governing language is C++03 [namespace.udecl]p12:
5237 /// When a using-declaration brings names from a base class into a
5238 /// derived class scope, member functions in the derived class
5239 /// override and/or hide member functions with the same name and
5240 /// parameter types in a base class (rather than conflicting).
5242 /// There are two ways to implement this:
5243 /// (1) optimistically create shadow decls when they're not hidden
5244 /// by existing declarations, or
5245 /// (2) don't create any shadow decls (or at least don't make them
5246 /// visible) until we've fully parsed/instantiated the class.
5247 /// The problem with (1) is that we might have to retroactively remove
5248 /// a shadow decl, which requires several O(n) operations because the
5249 /// decl structures are (very reasonably) not designed for removal.
5250 /// (2) avoids this but is very fiddly and phase-dependent.
5251 void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) {
5252 if (Shadow->getDeclName().getNameKind() ==
5253 DeclarationName::CXXConversionFunctionName)
5254 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow);
5256 // Remove it from the DeclContext...
5257 Shadow->getDeclContext()->removeDecl(Shadow);
5259 // ...and the scope, if applicable...
5261 S->RemoveDecl(Shadow);
5262 IdResolver.RemoveDecl(Shadow);
5265 // ...and the using decl.
5266 Shadow->getUsingDecl()->removeShadowDecl(Shadow);
5268 // TODO: complain somehow if Shadow was used. It shouldn't
5269 // be possible for this to happen, because...?
5272 /// Builds a using declaration.
5274 /// \param IsInstantiation - Whether this call arises from an
5275 /// instantiation of an unresolved using declaration. We treat
5276 /// the lookup differently for these declarations.
5277 NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
5278 SourceLocation UsingLoc,
5280 const DeclarationNameInfo &NameInfo,
5281 AttributeList *AttrList,
5282 bool IsInstantiation,
5284 SourceLocation TypenameLoc) {
5285 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
5286 SourceLocation IdentLoc = NameInfo.getLoc();
5287 assert(IdentLoc.isValid() && "Invalid TargetName location.");
5289 // FIXME: We ignore attributes for now.
5292 Diag(IdentLoc, diag::err_using_requires_qualname);
5296 // Do the redeclaration lookup in the current scope.
5297 LookupResult Previous(*this, NameInfo, LookupUsingDeclName,
5299 Previous.setHideTags(false);
5301 LookupName(Previous, S);
5303 // It is really dumb that we have to do this.
5304 LookupResult::Filter F = Previous.makeFilter();
5305 while (F.hasNext()) {
5306 NamedDecl *D = F.next();
5307 if (!isDeclInScope(D, CurContext, S))
5312 assert(IsInstantiation && "no scope in non-instantiation");
5313 assert(CurContext->isRecord() && "scope not record in instantiation");
5314 LookupQualifiedName(Previous, CurContext);
5317 // Check for invalid redeclarations.
5318 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous))
5321 // Check for bad qualifiers.
5322 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc))
5325 DeclContext *LookupContext = computeDeclContext(SS);
5327 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
5328 if (!LookupContext) {
5330 // FIXME: not all declaration name kinds are legal here
5331 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext,
5332 UsingLoc, TypenameLoc,
5334 IdentLoc, NameInfo.getName());
5336 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc,
5337 QualifierLoc, NameInfo);
5340 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc,
5341 NameInfo, IsTypeName);
5344 CurContext->addDecl(D);
5346 if (!LookupContext) return D;
5347 UsingDecl *UD = cast<UsingDecl>(D);
5349 if (RequireCompleteDeclContext(SS, LookupContext)) {
5350 UD->setInvalidDecl();
5354 // Constructor inheriting using decls get special treatment.
5355 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) {
5356 if (CheckInheritedConstructorUsingDecl(UD))
5357 UD->setInvalidDecl();
5361 // Otherwise, look up the target name.
5363 LookupResult R(*this, NameInfo, LookupOrdinaryName);
5364 R.setUsingDeclaration(true);
5366 // Unlike most lookups, we don't always want to hide tag
5367 // declarations: tag names are visible through the using declaration
5368 // even if hidden by ordinary names, *except* in a dependent context
5369 // where it's important for the sanity of two-phase lookup.
5370 if (!IsInstantiation)
5371 R.setHideTags(false);
5373 LookupQualifiedName(R, LookupContext);
5376 Diag(IdentLoc, diag::err_no_member)
5377 << NameInfo.getName() << LookupContext << SS.getRange();
5378 UD->setInvalidDecl();
5382 if (R.isAmbiguous()) {
5383 UD->setInvalidDecl();
5388 // If we asked for a typename and got a non-type decl, error out.
5389 if (!R.getAsSingle<TypeDecl>()) {
5390 Diag(IdentLoc, diag::err_using_typename_non_type);
5391 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
5392 Diag((*I)->getUnderlyingDecl()->getLocation(),
5393 diag::note_using_decl_target);
5394 UD->setInvalidDecl();
5398 // If we asked for a non-typename and we got a type, error out,
5399 // but only if this is an instantiation of an unresolved using
5400 // decl. Otherwise just silently find the type name.
5401 if (IsInstantiation && R.getAsSingle<TypeDecl>()) {
5402 Diag(IdentLoc, diag::err_using_dependent_value_is_type);
5403 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target);
5404 UD->setInvalidDecl();
5409 // C++0x N2914 [namespace.udecl]p6:
5410 // A using-declaration shall not name a namespace.
5411 if (R.getAsSingle<NamespaceDecl>()) {
5412 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace)
5414 UD->setInvalidDecl();
5418 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
5419 if (!CheckUsingShadowDecl(UD, *I, Previous))
5420 BuildUsingShadowDecl(S, UD, *I);
5426 /// Additional checks for a using declaration referring to a constructor name.
5427 bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) {
5428 if (UD->isTypeName()) {
5429 // FIXME: Cannot specify typename when specifying constructor
5433 const Type *SourceType = UD->getQualifier()->getAsType();
5434 assert(SourceType &&
5435 "Using decl naming constructor doesn't have type in scope spec.");
5436 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext);
5438 // Check whether the named type is a direct base class.
5439 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified();
5440 CXXRecordDecl::base_class_iterator BaseIt, BaseE;
5441 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end();
5442 BaseIt != BaseE; ++BaseIt) {
5443 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified();
5444 if (CanonicalSourceType == BaseType)
5448 if (BaseIt == BaseE) {
5449 // Did not find SourceType in the bases.
5450 Diag(UD->getUsingLocation(),
5451 diag::err_using_decl_constructor_not_in_direct_base)
5452 << UD->getNameInfo().getSourceRange()
5453 << QualType(SourceType, 0) << TargetClass;
5457 BaseIt->setInheritConstructors();
5462 /// Checks that the given using declaration is not an invalid
5463 /// redeclaration. Note that this is checking only for the using decl
5464 /// itself, not for any ill-formedness among the UsingShadowDecls.
5465 bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
5467 const CXXScopeSpec &SS,
5468 SourceLocation NameLoc,
5469 const LookupResult &Prev) {
5470 // C++03 [namespace.udecl]p8:
5471 // C++0x [namespace.udecl]p10:
5472 // A using-declaration is a declaration and can therefore be used
5473 // repeatedly where (and only where) multiple declarations are
5476 // That's in non-member contexts.
5477 if (!CurContext->getRedeclContext()->isRecord())
5480 NestedNameSpecifier *Qual
5481 = static_cast<NestedNameSpecifier*>(SS.getScopeRep());
5483 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) {
5487 NestedNameSpecifier *DQual;
5488 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) {
5489 DTypename = UD->isTypeName();
5490 DQual = UD->getQualifier();
5491 } else if (UnresolvedUsingValueDecl *UD
5492 = dyn_cast<UnresolvedUsingValueDecl>(D)) {
5494 DQual = UD->getQualifier();
5495 } else if (UnresolvedUsingTypenameDecl *UD
5496 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
5498 DQual = UD->getQualifier();
5501 // using decls differ if one says 'typename' and the other doesn't.
5502 // FIXME: non-dependent using decls?
5503 if (isTypeName != DTypename) continue;
5505 // using decls differ if they name different scopes (but note that
5506 // template instantiation can cause this check to trigger when it
5507 // didn't before instantiation).
5508 if (Context.getCanonicalNestedNameSpecifier(Qual) !=
5509 Context.getCanonicalNestedNameSpecifier(DQual))
5512 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange();
5513 Diag(D->getLocation(), diag::note_using_decl) << 1;
5521 /// Checks that the given nested-name qualifier used in a using decl
5522 /// in the current context is appropriately related to the current
5523 /// scope. If an error is found, diagnoses it and returns true.
5524 bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc,
5525 const CXXScopeSpec &SS,
5526 SourceLocation NameLoc) {
5527 DeclContext *NamedContext = computeDeclContext(SS);
5529 if (!CurContext->isRecord()) {
5530 // C++03 [namespace.udecl]p3:
5531 // C++0x [namespace.udecl]p8:
5532 // A using-declaration for a class member shall be a member-declaration.
5534 // If we weren't able to compute a valid scope, it must be a
5535 // dependent class scope.
5536 if (!NamedContext || NamedContext->isRecord()) {
5537 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member)
5542 // Otherwise, everything is known to be fine.
5546 // The current scope is a record.
5548 // If the named context is dependent, we can't decide much.
5549 if (!NamedContext) {
5550 // FIXME: in C++0x, we can diagnose if we can prove that the
5551 // nested-name-specifier does not refer to a base class, which is
5552 // still possible in some cases.
5554 // Otherwise we have to conservatively report that things might be
5559 if (!NamedContext->isRecord()) {
5560 // Ideally this would point at the last name in the specifier,
5561 // but we don't have that level of source info.
5562 Diag(SS.getRange().getBegin(),
5563 diag::err_using_decl_nested_name_specifier_is_not_class)
5564 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange();
5568 if (!NamedContext->isDependentContext() &&
5569 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext))
5572 if (getLangOptions().CPlusPlus0x) {
5573 // C++0x [namespace.udecl]p3:
5574 // In a using-declaration used as a member-declaration, the
5575 // nested-name-specifier shall name a base class of the class
5578 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(
5579 cast<CXXRecordDecl>(NamedContext))) {
5580 if (CurContext == NamedContext) {
5582 diag::err_using_decl_nested_name_specifier_is_current_class)
5587 Diag(SS.getRange().getBegin(),
5588 diag::err_using_decl_nested_name_specifier_is_not_base_class)
5589 << (NestedNameSpecifier*) SS.getScopeRep()
5590 << cast<CXXRecordDecl>(CurContext)
5598 // C++03 [namespace.udecl]p4:
5599 // A using-declaration used as a member-declaration shall refer
5600 // to a member of a base class of the class being defined [etc.].
5602 // Salient point: SS doesn't have to name a base class as long as
5603 // lookup only finds members from base classes. Therefore we can
5604 // diagnose here only if we can prove that that can't happen,
5605 // i.e. if the class hierarchies provably don't intersect.
5607 // TODO: it would be nice if "definitely valid" results were cached
5608 // in the UsingDecl and UsingShadowDecl so that these checks didn't
5609 // need to be repeated.
5612 llvm::DenseSet<const CXXRecordDecl*> Bases;
5614 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) {
5615 UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
5616 Data->Bases.insert(Base);
5620 bool hasDependentBases(const CXXRecordDecl *Class) {
5621 return !Class->forallBases(collect, this);
5624 /// Returns true if the base is dependent or is one of the
5625 /// accumulated base classes.
5626 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) {
5627 UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
5628 return !Data->Bases.count(Base);
5631 bool mightShareBases(const CXXRecordDecl *Class) {
5632 return Bases.count(Class) || !Class->forallBases(doesNotContain, this);
5638 // Returns false if we find a dependent base.
5639 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext)))
5642 // Returns false if the class has a dependent base or if it or one
5643 // of its bases is present in the base set of the current context.
5644 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext)))
5647 Diag(SS.getRange().getBegin(),
5648 diag::err_using_decl_nested_name_specifier_is_not_base_class)
5649 << (NestedNameSpecifier*) SS.getScopeRep()
5650 << cast<CXXRecordDecl>(CurContext)
5656 Decl *Sema::ActOnAliasDeclaration(Scope *S,
5658 MultiTemplateParamsArg TemplateParamLists,
5659 SourceLocation UsingLoc,
5660 UnqualifiedId &Name,
5662 // Skip up to the relevant declaration scope.
5663 while (S->getFlags() & Scope::TemplateParamScope)
5665 assert((S->getFlags() & Scope::DeclScope) &&
5666 "got alias-declaration outside of declaration scope");
5668 if (Type.isInvalid())
5671 bool Invalid = false;
5672 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name);
5673 TypeSourceInfo *TInfo = 0;
5674 GetTypeFromParser(Type.get(), &TInfo);
5676 if (DiagnoseClassNameShadow(CurContext, NameInfo))
5679 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo,
5680 UPPC_DeclarationType)) {
5682 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
5683 TInfo->getTypeLoc().getBeginLoc());
5686 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration);
5687 LookupName(Previous, S);
5689 // Warn about shadowing the name of a template parameter.
5690 if (Previous.isSingleResult() &&
5691 Previous.getFoundDecl()->isTemplateParameter()) {
5692 if (DiagnoseTemplateParameterShadow(Name.StartLocation,
5693 Previous.getFoundDecl()))
5698 assert(Name.Kind == UnqualifiedId::IK_Identifier &&
5699 "name in alias declaration must be an identifier");
5700 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc,
5702 Name.Identifier, TInfo);
5704 NewTD->setAccess(AS);
5707 NewTD->setInvalidDecl();
5709 CheckTypedefForVariablyModifiedType(S, NewTD);
5710 Invalid |= NewTD->isInvalidDecl();
5712 bool Redeclaration = false;
5715 if (TemplateParamLists.size()) {
5716 TypeAliasTemplateDecl *OldDecl = 0;
5717 TemplateParameterList *OldTemplateParams = 0;
5719 if (TemplateParamLists.size() != 1) {
5720 Diag(UsingLoc, diag::err_alias_template_extra_headers)
5721 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(),
5722 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc());
5724 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0];
5726 // Only consider previous declarations in the same scope.
5727 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false,
5728 /*ExplicitInstantiationOrSpecialization*/false);
5729 if (!Previous.empty()) {
5730 Redeclaration = true;
5732 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>();
5733 if (!OldDecl && !Invalid) {
5734 Diag(UsingLoc, diag::err_redefinition_different_kind)
5737 NamedDecl *OldD = Previous.getRepresentativeDecl();
5738 if (OldD->getLocation().isValid())
5739 Diag(OldD->getLocation(), diag::note_previous_definition);
5744 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) {
5745 if (TemplateParameterListsAreEqual(TemplateParams,
5746 OldDecl->getTemplateParameters(),
5749 OldTemplateParams = OldDecl->getTemplateParameters();
5753 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl();
5755 !Context.hasSameType(OldTD->getUnderlyingType(),
5756 NewTD->getUnderlyingType())) {
5757 // FIXME: The C++0x standard does not clearly say this is ill-formed,
5758 // but we can't reasonably accept it.
5759 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef)
5760 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType();
5761 if (OldTD->getLocation().isValid())
5762 Diag(OldTD->getLocation(), diag::note_previous_definition);
5768 // Merge any previous default template arguments into our parameters,
5769 // and check the parameter list.
5770 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams,
5771 TPC_TypeAliasTemplate))
5774 TypeAliasTemplateDecl *NewDecl =
5775 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc,
5776 Name.Identifier, TemplateParams,
5779 NewDecl->setAccess(AS);
5782 NewDecl->setInvalidDecl();
5784 NewDecl->setPreviousDeclaration(OldDecl);
5788 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration);
5793 PushOnScopeChains(NewND, S);
5798 Decl *Sema::ActOnNamespaceAliasDef(Scope *S,
5799 SourceLocation NamespaceLoc,
5800 SourceLocation AliasLoc,
5801 IdentifierInfo *Alias,
5803 SourceLocation IdentLoc,
5804 IdentifierInfo *Ident) {
5806 // Lookup the namespace name.
5807 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName);
5808 LookupParsedName(R, S, &SS);
5810 // Check if we have a previous declaration with the same name.
5812 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName,
5814 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S))
5818 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) {
5819 // We already have an alias with the same name that points to the same
5820 // namespace, so don't create a new one.
5821 // FIXME: At some point, we'll want to create the (redundant)
5822 // declaration to maintain better source information.
5823 if (!R.isAmbiguous() && !R.empty() &&
5824 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl())))
5828 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition :
5829 diag::err_redefinition_different_kind;
5830 Diag(AliasLoc, DiagID) << Alias;
5831 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
5835 if (R.isAmbiguous())
5839 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) {
5840 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange();
5845 NamespaceAliasDecl *AliasDecl =
5846 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc,
5847 Alias, SS.getWithLocInContext(Context),
5848 IdentLoc, R.getFoundDecl());
5850 PushOnScopeChains(AliasDecl, S);
5855 /// \brief Scoped object used to handle the state changes required in Sema
5856 /// to implicitly define the body of a C++ member function;
5857 class ImplicitlyDefinedFunctionScope {
5859 Sema::ContextRAII SavedContext;
5862 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method)
5863 : S(S), SavedContext(S, Method)
5865 S.PushFunctionScope();
5866 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated);
5869 ~ImplicitlyDefinedFunctionScope() {
5870 S.PopExpressionEvaluationContext();
5871 S.PopFunctionOrBlockScope();
5876 Sema::ImplicitExceptionSpecification
5877 Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) {
5878 // C++ [except.spec]p14:
5879 // An implicitly declared special member function (Clause 12) shall have an
5880 // exception-specification. [...]
5881 ImplicitExceptionSpecification ExceptSpec(Context);
5882 if (ClassDecl->isInvalidDecl())
5885 // Direct base-class constructors.
5886 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
5887 BEnd = ClassDecl->bases_end();
5889 if (B->isVirtual()) // Handled below.
5892 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
5893 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
5894 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
5895 // If this is a deleted function, add it anyway. This might be conformant
5896 // with the standard. This might not. I'm not sure. It might not matter.
5898 ExceptSpec.CalledDecl(Constructor);
5902 // Virtual base-class constructors.
5903 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
5904 BEnd = ClassDecl->vbases_end();
5906 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) {
5907 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
5908 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
5909 // If this is a deleted function, add it anyway. This might be conformant
5910 // with the standard. This might not. I'm not sure. It might not matter.
5912 ExceptSpec.CalledDecl(Constructor);
5916 // Field constructors.
5917 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
5918 FEnd = ClassDecl->field_end();
5920 if (F->hasInClassInitializer()) {
5921 if (Expr *E = F->getInClassInitializer())
5922 ExceptSpec.CalledExpr(E);
5923 else if (!F->isInvalidDecl())
5924 ExceptSpec.SetDelayed();
5925 } else if (const RecordType *RecordTy
5926 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) {
5927 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
5928 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl);
5929 // If this is a deleted function, add it anyway. This might be conformant
5930 // with the standard. This might not. I'm not sure. It might not matter.
5931 // In particular, the problem is that this function never gets called. It
5932 // might just be ill-formed because this function attempts to refer to
5933 // a deleted function here.
5935 ExceptSpec.CalledDecl(Constructor);
5942 CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor(
5943 CXXRecordDecl *ClassDecl) {
5944 // C++ [class.ctor]p5:
5945 // A default constructor for a class X is a constructor of class X
5946 // that can be called without an argument. If there is no
5947 // user-declared constructor for class X, a default constructor is
5948 // implicitly declared. An implicitly-declared default constructor
5949 // is an inline public member of its class.
5950 assert(!ClassDecl->hasUserDeclaredConstructor() &&
5951 "Should not build implicit default constructor!");
5953 ImplicitExceptionSpecification Spec =
5954 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl);
5955 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
5957 // Create the actual constructor declaration.
5958 CanQualType ClassType
5959 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
5960 SourceLocation ClassLoc = ClassDecl->getLocation();
5961 DeclarationName Name
5962 = Context.DeclarationNames.getCXXConstructorName(ClassType);
5963 DeclarationNameInfo NameInfo(Name, ClassLoc);
5964 CXXConstructorDecl *DefaultCon
5965 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo,
5966 Context.getFunctionType(Context.VoidTy,
5969 /*isExplicit=*/false,
5971 /*isImplicitlyDeclared=*/true);
5972 DefaultCon->setAccess(AS_public);
5973 DefaultCon->setDefaulted();
5974 DefaultCon->setImplicit();
5975 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor());
5977 // Note that we have declared this constructor.
5978 ++ASTContext::NumImplicitDefaultConstructorsDeclared;
5980 if (Scope *S = getScopeForContext(ClassDecl))
5981 PushOnScopeChains(DefaultCon, S, false);
5982 ClassDecl->addDecl(DefaultCon);
5984 if (ShouldDeleteDefaultConstructor(DefaultCon))
5985 DefaultCon->setDeletedAsWritten();
5990 void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
5991 CXXConstructorDecl *Constructor) {
5992 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&
5993 !Constructor->doesThisDeclarationHaveABody() &&
5994 !Constructor->isDeleted()) &&
5995 "DefineImplicitDefaultConstructor - call it for implicit default ctor");
5997 CXXRecordDecl *ClassDecl = Constructor->getParent();
5998 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor");
6000 ImplicitlyDefinedFunctionScope Scope(*this, Constructor);
6001 DiagnosticErrorTrap Trap(Diags);
6002 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) ||
6003 Trap.hasErrorOccurred()) {
6004 Diag(CurrentLocation, diag::note_member_synthesized_at)
6005 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl);
6006 Constructor->setInvalidDecl();
6010 SourceLocation Loc = Constructor->getLocation();
6011 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc));
6013 Constructor->setUsed();
6014 MarkVTableUsed(CurrentLocation, ClassDecl);
6016 if (ASTMutationListener *L = getASTMutationListener()) {
6017 L->CompletedImplicitDefinition(Constructor);
6021 /// Get any existing defaulted default constructor for the given class. Do not
6022 /// implicitly define one if it does not exist.
6023 static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self,
6025 ASTContext &Context = Self.Context;
6026 QualType ClassType = Context.getTypeDeclType(D);
6027 DeclarationName ConstructorName
6028 = Context.DeclarationNames.getCXXConstructorName(
6029 Context.getCanonicalType(ClassType.getUnqualifiedType()));
6031 DeclContext::lookup_const_iterator Con, ConEnd;
6032 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName);
6033 Con != ConEnd; ++Con) {
6034 // A function template cannot be defaulted.
6035 if (isa<FunctionTemplateDecl>(*Con))
6038 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con);
6039 if (Constructor->isDefaultConstructor())
6040 return Constructor->isDefaulted() ? Constructor : 0;
6045 void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) {
6047 AdjustDeclIfTemplate(D);
6049 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D);
6050 CXXConstructorDecl *CtorDecl
6051 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl);
6053 if (!CtorDecl) return;
6055 // Compute the exception specification for the default constructor.
6056 const FunctionProtoType *CtorTy =
6057 CtorDecl->getType()->castAs<FunctionProtoType>();
6058 if (CtorTy->getExceptionSpecType() == EST_Delayed) {
6059 ImplicitExceptionSpecification Spec =
6060 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl);
6061 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
6062 assert(EPI.ExceptionSpecType != EST_Delayed);
6064 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI));
6067 // If the default constructor is explicitly defaulted, checking the exception
6068 // specification is deferred until now.
6069 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() &&
6070 !ClassDecl->isDependentType())
6071 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl);
6074 void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) {
6075 // We start with an initial pass over the base classes to collect those that
6076 // inherit constructors from. If there are none, we can forgo all further
6078 typedef llvm::SmallVector<const RecordType *, 4> BasesVector;
6079 BasesVector BasesToInheritFrom;
6080 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(),
6081 BaseE = ClassDecl->bases_end();
6082 BaseIt != BaseE; ++BaseIt) {
6083 if (BaseIt->getInheritConstructors()) {
6084 QualType Base = BaseIt->getType();
6085 if (Base->isDependentType()) {
6086 // If we inherit constructors from anything that is dependent, just
6087 // abort processing altogether. We'll get another chance for the
6091 BasesToInheritFrom.push_back(Base->castAs<RecordType>());
6094 if (BasesToInheritFrom.empty())
6097 // Now collect the constructors that we already have in the current class.
6098 // Those take precedence over inherited constructors.
6099 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...]
6100 // unless there is a user-declared constructor with the same signature in
6101 // the class where the using-declaration appears.
6102 llvm::SmallSet<const Type *, 8> ExistingConstructors;
6103 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(),
6104 CtorE = ClassDecl->ctor_end();
6105 CtorIt != CtorE; ++CtorIt) {
6106 ExistingConstructors.insert(
6107 Context.getCanonicalType(CtorIt->getType()).getTypePtr());
6110 Scope *S = getScopeForContext(ClassDecl);
6111 DeclarationName CreatedCtorName =
6112 Context.DeclarationNames.getCXXConstructorName(
6113 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified());
6115 // Now comes the true work.
6116 // First, we keep a map from constructor types to the base that introduced
6117 // them. Needed for finding conflicting constructors. We also keep the
6118 // actually inserted declarations in there, for pretty diagnostics.
6119 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo;
6120 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap;
6121 ConstructorToSourceMap InheritedConstructors;
6122 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(),
6123 BaseE = BasesToInheritFrom.end();
6124 BaseIt != BaseE; ++BaseIt) {
6125 const RecordType *Base = *BaseIt;
6126 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified();
6127 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl());
6128 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(),
6129 CtorE = BaseDecl->ctor_end();
6130 CtorIt != CtorE; ++CtorIt) {
6131 // Find the using declaration for inheriting this base's constructors.
6132 DeclarationName Name =
6133 Context.DeclarationNames.getCXXConstructorName(CanonicalBase);
6134 UsingDecl *UD = dyn_cast_or_null<UsingDecl>(
6135 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName));
6136 SourceLocation UsingLoc = UD ? UD->getLocation() :
6137 ClassDecl->getLocation();
6139 // C++0x [class.inhctor]p1: The candidate set of inherited constructors
6140 // from the class X named in the using-declaration consists of actual
6141 // constructors and notional constructors that result from the
6142 // transformation of defaulted parameters as follows:
6143 // - all non-template default constructors of X, and
6144 // - for each non-template constructor of X that has at least one
6145 // parameter with a default argument, the set of constructors that
6146 // results from omitting any ellipsis parameter specification and
6147 // successively omitting parameters with a default argument from the
6148 // end of the parameter-type-list.
6149 CXXConstructorDecl *BaseCtor = *CtorIt;
6150 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor();
6151 const FunctionProtoType *BaseCtorType =
6152 BaseCtor->getType()->getAs<FunctionProtoType>();
6154 for (unsigned params = BaseCtor->getMinRequiredArguments(),
6155 maxParams = BaseCtor->getNumParams();
6156 params <= maxParams; ++params) {
6157 // Skip default constructors. They're never inherited.
6160 // Skip copy and move constructors for the same reason.
6161 if (CanBeCopyOrMove && params == 1)
6164 // Build up a function type for this particular constructor.
6165 // FIXME: The working paper does not consider that the exception spec
6166 // for the inheriting constructor might be larger than that of the
6167 // source. This code doesn't yet, either. When it does, this code will
6168 // need to be delayed until after exception specifications and in-class
6169 // member initializers are attached.
6170 const Type *NewCtorType;
6171 if (params == maxParams)
6172 NewCtorType = BaseCtorType;
6174 llvm::SmallVector<QualType, 16> Args;
6175 for (unsigned i = 0; i < params; ++i) {
6176 Args.push_back(BaseCtorType->getArgType(i));
6178 FunctionProtoType::ExtProtoInfo ExtInfo =
6179 BaseCtorType->getExtProtoInfo();
6180 ExtInfo.Variadic = false;
6181 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(),
6182 Args.data(), params, ExtInfo)
6185 const Type *CanonicalNewCtorType =
6186 Context.getCanonicalType(NewCtorType);
6188 // Now that we have the type, first check if the class already has a
6189 // constructor with this signature.
6190 if (ExistingConstructors.count(CanonicalNewCtorType))
6193 // Then we check if we have already declared an inherited constructor
6194 // with this signature.
6195 std::pair<ConstructorToSourceMap::iterator, bool> result =
6196 InheritedConstructors.insert(std::make_pair(
6197 CanonicalNewCtorType,
6198 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0)));
6199 if (!result.second) {
6200 // Already in the map. If it came from a different class, that's an
6201 // error. Not if it's from the same.
6202 CanQualType PreviousBase = result.first->second.first;
6203 if (CanonicalBase != PreviousBase) {
6204 const CXXConstructorDecl *PrevCtor = result.first->second.second;
6205 const CXXConstructorDecl *PrevBaseCtor =
6206 PrevCtor->getInheritedConstructor();
6207 assert(PrevBaseCtor && "Conflicting constructor was not inherited");
6209 Diag(UsingLoc, diag::err_using_decl_constructor_conflict);
6210 Diag(BaseCtor->getLocation(),
6211 diag::note_using_decl_constructor_conflict_current_ctor);
6212 Diag(PrevBaseCtor->getLocation(),
6213 diag::note_using_decl_constructor_conflict_previous_ctor);
6214 Diag(PrevCtor->getLocation(),
6215 diag::note_using_decl_constructor_conflict_previous_using);
6220 // OK, we're there, now add the constructor.
6221 // C++0x [class.inhctor]p8: [...] that would be performed by a
6222 // user-writtern inline constructor [...]
6223 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc);
6224 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create(
6225 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0),
6226 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true,
6227 /*ImplicitlyDeclared=*/true);
6228 NewCtor->setAccess(BaseCtor->getAccess());
6230 // Build up the parameter decls and add them.
6231 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls;
6232 for (unsigned i = 0; i < params; ++i) {
6233 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor,
6235 /*IdentifierInfo=*/0,
6236 BaseCtorType->getArgType(i),
6237 /*TInfo=*/0, SC_None,
6238 SC_None, /*DefaultArg=*/0));
6240 NewCtor->setParams(ParamDecls.data(), ParamDecls.size());
6241 NewCtor->setInheritedConstructor(BaseCtor);
6243 PushOnScopeChains(NewCtor, S, false);
6244 ClassDecl->addDecl(NewCtor);
6245 result.first->second.second = NewCtor;
6251 Sema::ImplicitExceptionSpecification
6252 Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) {
6253 // C++ [except.spec]p14:
6254 // An implicitly declared special member function (Clause 12) shall have
6255 // an exception-specification.
6256 ImplicitExceptionSpecification ExceptSpec(Context);
6257 if (ClassDecl->isInvalidDecl())
6260 // Direct base-class destructors.
6261 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(),
6262 BEnd = ClassDecl->bases_end();
6264 if (B->isVirtual()) // Handled below.
6267 if (const RecordType *BaseType = B->getType()->getAs<RecordType>())
6268 ExceptSpec.CalledDecl(
6269 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl())));
6272 // Virtual base-class destructors.
6273 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(),
6274 BEnd = ClassDecl->vbases_end();
6276 if (const RecordType *BaseType = B->getType()->getAs<RecordType>())
6277 ExceptSpec.CalledDecl(
6278 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl())));
6281 // Field destructors.
6282 for (RecordDecl::field_iterator F = ClassDecl->field_begin(),
6283 FEnd = ClassDecl->field_end();
6285 if (const RecordType *RecordTy
6286 = Context.getBaseElementType(F->getType())->getAs<RecordType>())
6287 ExceptSpec.CalledDecl(
6288 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl())));
6294 CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) {
6295 // C++ [class.dtor]p2:
6296 // If a class has no user-declared destructor, a destructor is
6297 // declared implicitly. An implicitly-declared destructor is an
6298 // inline public member of its class.
6300 ImplicitExceptionSpecification Spec =
6301 ComputeDefaultedDtorExceptionSpec(ClassDecl);
6302 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
6304 // Create the actual destructor declaration.
6305 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI);
6307 CanQualType ClassType
6308 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
6309 SourceLocation ClassLoc = ClassDecl->getLocation();
6310 DeclarationName Name
6311 = Context.DeclarationNames.getCXXDestructorName(ClassType);
6312 DeclarationNameInfo NameInfo(Name, ClassLoc);
6313 CXXDestructorDecl *Destructor
6314 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0,
6316 /*isImplicitlyDeclared=*/true);
6317 Destructor->setAccess(AS_public);
6318 Destructor->setDefaulted();
6319 Destructor->setImplicit();
6320 Destructor->setTrivial(ClassDecl->hasTrivialDestructor());
6322 // Note that we have declared this destructor.
6323 ++ASTContext::NumImplicitDestructorsDeclared;
6325 // Introduce this destructor into its scope.
6326 if (Scope *S = getScopeForContext(ClassDecl))
6327 PushOnScopeChains(Destructor, S, false);
6328 ClassDecl->addDecl(Destructor);
6330 // This could be uniqued if it ever proves significant.
6331 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty));
6333 if (ShouldDeleteDestructor(Destructor))
6334 Destructor->setDeletedAsWritten();
6336 AddOverriddenMethods(ClassDecl, Destructor);
6341 void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation,
6342 CXXDestructorDecl *Destructor) {
6343 assert((Destructor->isDefaulted() &&
6344 !Destructor->doesThisDeclarationHaveABody()) &&
6345 "DefineImplicitDestructor - call it for implicit default dtor");
6346 CXXRecordDecl *ClassDecl = Destructor->getParent();
6347 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor");
6349 if (Destructor->isInvalidDecl())
6352 ImplicitlyDefinedFunctionScope Scope(*this, Destructor);
6354 DiagnosticErrorTrap Trap(Diags);
6355 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
6356 Destructor->getParent());
6358 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) {
6359 Diag(CurrentLocation, diag::note_member_synthesized_at)
6360 << CXXDestructor << Context.getTagDeclType(ClassDecl);
6362 Destructor->setInvalidDecl();
6366 SourceLocation Loc = Destructor->getLocation();
6367 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc));
6369 Destructor->setUsed();
6370 MarkVTableUsed(CurrentLocation, ClassDecl);
6372 if (ASTMutationListener *L = getASTMutationListener()) {
6373 L->CompletedImplicitDefinition(Destructor);
6377 void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl,
6378 CXXDestructorDecl *destructor) {
6379 // C++11 [class.dtor]p3:
6380 // A declaration of a destructor that does not have an exception-
6381 // specification is implicitly considered to have the same exception-
6382 // specification as an implicit declaration.
6383 const FunctionProtoType *dtorType = destructor->getType()->
6384 getAs<FunctionProtoType>();
6385 if (dtorType->hasExceptionSpec())
6388 ImplicitExceptionSpecification exceptSpec =
6389 ComputeDefaultedDtorExceptionSpec(classDecl);
6391 // Replace the destructor's type.
6392 FunctionProtoType::ExtProtoInfo epi;
6393 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType();
6394 epi.NumExceptions = exceptSpec.size();
6395 epi.Exceptions = exceptSpec.data();
6396 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi);
6398 destructor->setType(ty);
6400 // FIXME: If the destructor has a body that could throw, and the newly created
6401 // spec doesn't allow exceptions, we should emit a warning, because this
6402 // change in behavior can break conforming C++03 programs at runtime.
6403 // However, we don't have a body yet, so it needs to be done somewhere else.
6406 /// \brief Builds a statement that copies the given entity from \p From to
6409 /// This routine is used to copy the members of a class with an
6410 /// implicitly-declared copy assignment operator. When the entities being
6411 /// copied are arrays, this routine builds for loops to copy them.
6413 /// \param S The Sema object used for type-checking.
6415 /// \param Loc The location where the implicit copy is being generated.
6417 /// \param T The type of the expressions being copied. Both expressions must
6420 /// \param To The expression we are copying to.
6422 /// \param From The expression we are copying from.
6424 /// \param CopyingBaseSubobject Whether we're copying a base subobject.
6425 /// Otherwise, it's a non-static member subobject.
6427 /// \param Depth Internal parameter recording the depth of the recursion.
6429 /// \returns A statement or a loop that copies the expressions.
6431 BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T,
6432 Expr *To, Expr *From,
6433 bool CopyingBaseSubobject, unsigned Depth = 0) {
6434 // C++0x [class.copy]p30:
6435 // Each subobject is assigned in the manner appropriate to its type:
6437 // - if the subobject is of class type, the copy assignment operator
6438 // for the class is used (as if by explicit qualification; that is,
6439 // ignoring any possible virtual overriding functions in more derived
6441 if (const RecordType *RecordTy = T->getAs<RecordType>()) {
6442 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
6444 // Look for operator=.
6445 DeclarationName Name
6446 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal);
6447 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName);
6448 S.LookupQualifiedName(OpLookup, ClassDecl, false);
6450 // Filter out any result that isn't a copy-assignment operator.
6451 LookupResult::Filter F = OpLookup.makeFilter();
6452 while (F.hasNext()) {
6453 NamedDecl *D = F.next();
6454 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
6455 if (Method->isCopyAssignmentOperator())
6462 // Suppress the protected check (C++ [class.protected]) for each of the
6463 // assignment operators we found. This strange dance is required when
6464 // we're assigning via a base classes's copy-assignment operator. To
6465 // ensure that we're getting the right base class subobject (without
6466 // ambiguities), we need to cast "this" to that subobject type; to
6467 // ensure that we don't go through the virtual call mechanism, we need
6468 // to qualify the operator= name with the base class (see below). However,
6469 // this means that if the base class has a protected copy assignment
6470 // operator, the protected member access check will fail. So, we
6471 // rewrite "protected" access to "public" access in this case, since we
6472 // know by construction that we're calling from a derived class.
6473 if (CopyingBaseSubobject) {
6474 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end();
6476 if (L.getAccess() == AS_protected)
6477 L.setAccess(AS_public);
6481 // Create the nested-name-specifier that will be used to qualify the
6482 // reference to operator=; this is required to suppress the virtual
6485 SS.MakeTrivial(S.Context,
6486 NestedNameSpecifier::Create(S.Context, 0, false,
6490 // Create the reference to operator=.
6491 ExprResult OpEqualRef
6492 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS,
6493 /*FirstQualifierInScope=*/0, OpLookup,
6495 /*SuppressQualifierCheck=*/true);
6496 if (OpEqualRef.isInvalid())
6499 // Build the call to the assignment operator.
6501 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0,
6502 OpEqualRef.takeAs<Expr>(),
6503 Loc, &From, 1, Loc);
6504 if (Call.isInvalid())
6507 return S.Owned(Call.takeAs<Stmt>());
6510 // - if the subobject is of scalar type, the built-in assignment
6511 // operator is used.
6512 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T);
6514 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From);
6515 if (Assignment.isInvalid())
6518 return S.Owned(Assignment.takeAs<Stmt>());
6521 // - if the subobject is an array, each element is assigned, in the
6522 // manner appropriate to the element type;
6524 // Construct a loop over the array bounds, e.g.,
6526 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0)
6528 // that will copy each of the array elements.
6529 QualType SizeType = S.Context.getSizeType();
6531 // Create the iteration variable.
6532 IdentifierInfo *IterationVarName = 0;
6534 llvm::SmallString<8> Str;
6535 llvm::raw_svector_ostream OS(Str);
6536 OS << "__i" << Depth;
6537 IterationVarName = &S.Context.Idents.get(OS.str());
6539 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc,
6540 IterationVarName, SizeType,
6541 S.Context.getTrivialTypeSourceInfo(SizeType, Loc),
6544 // Initialize the iteration variable to zero.
6545 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0);
6546 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc));
6548 // Create a reference to the iteration variable; we'll use this several
6549 // times throughout.
6550 Expr *IterationVarRef
6551 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take();
6552 assert(IterationVarRef && "Reference to invented variable cannot fail!");
6554 // Create the DeclStmt that holds the iteration variable.
6555 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc);
6557 // Create the comparison against the array bound.
6559 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType));
6561 = new (S.Context) BinaryOperator(IterationVarRef,
6562 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc),
6563 BO_NE, S.Context.BoolTy,
6564 VK_RValue, OK_Ordinary, Loc);
6566 // Create the pre-increment of the iteration variable.
6568 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType,
6569 VK_LValue, OK_Ordinary, Loc);
6571 // Subscript the "from" and "to" expressions with the iteration variable.
6572 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc,
6573 IterationVarRef, Loc));
6574 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc,
6575 IterationVarRef, Loc));
6577 // Build the copy for an individual element of the array.
6578 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(),
6579 To, From, CopyingBaseSubobject,
6581 if (Copy.isInvalid())
6584 // Construct the loop that copies all elements of this array.
6585 return S.ActOnForStmt(Loc, Loc, InitStmt,
6586 S.MakeFullExpr(Comparison),
6587 0, S.MakeFullExpr(Increment),
6591 std::pair<Sema::ImplicitExceptionSpecification, bool>
6592 Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst(
6593 CXXRecordDecl *ClassDecl) {
6594 if (ClassDecl->isInvalidDecl())
6595 return std::make_pair(ImplicitExceptionSpecification(Context), false);
6597 // C++ [class.copy]p10:
6598 // If the class definition does not explicitly declare a copy
6599 // assignment operator, one is declared implicitly.
6600 // The implicitly-defined copy assignment operator for a class X
6601 // will have the form
6603 // X& X::operator=(const X&)
6606 bool HasConstCopyAssignment = true;
6608 // -- each direct base class B of X has a copy assignment operator
6609 // whose parameter is of type const B&, const volatile B& or B,
6611 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
6612 BaseEnd = ClassDecl->bases_end();
6613 HasConstCopyAssignment && Base != BaseEnd; ++Base) {
6614 // We'll handle this below
6615 if (LangOpts.CPlusPlus0x && Base->isVirtual())
6618 assert(!Base->getType()->isDependentType() &&
6619 "Cannot generate implicit members for class with dependent bases.");
6620 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl();
6621 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0,
6622 &HasConstCopyAssignment);
6625 // In C++0x, the above citation has "or virtual added"
6626 if (LangOpts.CPlusPlus0x) {
6627 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
6628 BaseEnd = ClassDecl->vbases_end();
6629 HasConstCopyAssignment && Base != BaseEnd; ++Base) {
6630 assert(!Base->getType()->isDependentType() &&
6631 "Cannot generate implicit members for class with dependent bases.");
6632 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl();
6633 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0,
6634 &HasConstCopyAssignment);
6638 // -- for all the nonstatic data members of X that are of a class
6639 // type M (or array thereof), each such class type has a copy
6640 // assignment operator whose parameter is of type const M&,
6641 // const volatile M& or M.
6642 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
6643 FieldEnd = ClassDecl->field_end();
6644 HasConstCopyAssignment && Field != FieldEnd;
6646 QualType FieldType = Context.getBaseElementType((*Field)->getType());
6647 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
6648 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0,
6649 &HasConstCopyAssignment);
6653 // Otherwise, the implicitly declared copy assignment operator will
6656 // X& X::operator=(X&)
6658 // C++ [except.spec]p14:
6659 // An implicitly declared special member function (Clause 12) shall have an
6660 // exception-specification. [...]
6662 // It is unspecified whether or not an implicit copy assignment operator
6663 // attempts to deduplicate calls to assignment operators of virtual bases are
6664 // made. As such, this exception specification is effectively unspecified.
6665 // Based on a similar decision made for constness in C++0x, we're erring on
6666 // the side of assuming such calls to be made regardless of whether they
6668 ImplicitExceptionSpecification ExceptSpec(Context);
6669 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0;
6670 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
6671 BaseEnd = ClassDecl->bases_end();
6672 Base != BaseEnd; ++Base) {
6673 if (Base->isVirtual())
6676 CXXRecordDecl *BaseClassDecl
6677 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
6678 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl,
6679 ArgQuals, false, 0))
6680 ExceptSpec.CalledDecl(CopyAssign);
6683 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
6684 BaseEnd = ClassDecl->vbases_end();
6685 Base != BaseEnd; ++Base) {
6686 CXXRecordDecl *BaseClassDecl
6687 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
6688 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl,
6689 ArgQuals, false, 0))
6690 ExceptSpec.CalledDecl(CopyAssign);
6693 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
6694 FieldEnd = ClassDecl->field_end();
6697 QualType FieldType = Context.getBaseElementType((*Field)->getType());
6698 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
6699 if (CXXMethodDecl *CopyAssign =
6700 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0))
6701 ExceptSpec.CalledDecl(CopyAssign);
6705 return std::make_pair(ExceptSpec, HasConstCopyAssignment);
6708 CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) {
6709 // Note: The following rules are largely analoguous to the copy
6710 // constructor rules. Note that virtual bases are not taken into account
6711 // for determining the argument type of the operator. Note also that
6712 // operators taking an object instead of a reference are allowed.
6714 ImplicitExceptionSpecification Spec(Context);
6716 llvm::tie(Spec, Const) =
6717 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl);
6719 QualType ArgType = Context.getTypeDeclType(ClassDecl);
6720 QualType RetType = Context.getLValueReferenceType(ArgType);
6722 ArgType = ArgType.withConst();
6723 ArgType = Context.getLValueReferenceType(ArgType);
6725 // An implicitly-declared copy assignment operator is an inline public
6726 // member of its class.
6727 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
6728 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
6729 SourceLocation ClassLoc = ClassDecl->getLocation();
6730 DeclarationNameInfo NameInfo(Name, ClassLoc);
6731 CXXMethodDecl *CopyAssignment
6732 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo,
6733 Context.getFunctionType(RetType, &ArgType, 1, EPI),
6734 /*TInfo=*/0, /*isStatic=*/false,
6735 /*StorageClassAsWritten=*/SC_None,
6738 CopyAssignment->setAccess(AS_public);
6739 CopyAssignment->setDefaulted();
6740 CopyAssignment->setImplicit();
6741 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment());
6743 // Add the parameter to the operator.
6744 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment,
6745 ClassLoc, ClassLoc, /*Id=*/0,
6746 ArgType, /*TInfo=*/0,
6749 CopyAssignment->setParams(&FromParam, 1);
6751 // Note that we have added this copy-assignment operator.
6752 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared;
6754 if (Scope *S = getScopeForContext(ClassDecl))
6755 PushOnScopeChains(CopyAssignment, S, false);
6756 ClassDecl->addDecl(CopyAssignment);
6758 // C++0x [class.copy]p18:
6759 // ... If the class definition declares a move constructor or move
6760 // assignment operator, the implicitly declared copy assignment operator is
6761 // defined as deleted; ...
6762 if (ClassDecl->hasUserDeclaredMoveConstructor() ||
6763 ClassDecl->hasUserDeclaredMoveAssignment() ||
6764 ShouldDeleteCopyAssignmentOperator(CopyAssignment))
6765 CopyAssignment->setDeletedAsWritten();
6767 AddOverriddenMethods(ClassDecl, CopyAssignment);
6768 return CopyAssignment;
6771 void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation,
6772 CXXMethodDecl *CopyAssignOperator) {
6773 assert((CopyAssignOperator->isDefaulted() &&
6774 CopyAssignOperator->isOverloadedOperator() &&
6775 CopyAssignOperator->getOverloadedOperator() == OO_Equal &&
6776 !CopyAssignOperator->doesThisDeclarationHaveABody()) &&
6777 "DefineImplicitCopyAssignment called for wrong function");
6779 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent();
6781 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) {
6782 CopyAssignOperator->setInvalidDecl();
6786 CopyAssignOperator->setUsed();
6788 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator);
6789 DiagnosticErrorTrap Trap(Diags);
6791 // C++0x [class.copy]p30:
6792 // The implicitly-defined or explicitly-defaulted copy assignment operator
6793 // for a non-union class X performs memberwise copy assignment of its
6794 // subobjects. The direct base classes of X are assigned first, in the
6795 // order of their declaration in the base-specifier-list, and then the
6796 // immediate non-static data members of X are assigned, in the order in
6797 // which they were declared in the class definition.
6799 // The statements that form the synthesized function body.
6800 ASTOwningVector<Stmt*> Statements(*this);
6802 // The parameter for the "other" object, which we are copying from.
6803 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0);
6804 Qualifiers OtherQuals = Other->getType().getQualifiers();
6805 QualType OtherRefType = Other->getType();
6806 if (const LValueReferenceType *OtherRef
6807 = OtherRefType->getAs<LValueReferenceType>()) {
6808 OtherRefType = OtherRef->getPointeeType();
6809 OtherQuals = OtherRefType.getQualifiers();
6812 // Our location for everything implicitly-generated.
6813 SourceLocation Loc = CopyAssignOperator->getLocation();
6815 // Construct a reference to the "other" object. We'll be using this
6816 // throughout the generated ASTs.
6817 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take();
6818 assert(OtherRef && "Reference to parameter cannot fail!");
6820 // Construct the "this" pointer. We'll be using this throughout the generated
6822 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>();
6823 assert(This && "Reference to this cannot fail!");
6825 // Assign base classes.
6826 bool Invalid = false;
6827 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
6828 E = ClassDecl->bases_end(); Base != E; ++Base) {
6829 // Form the assignment:
6830 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other));
6831 QualType BaseType = Base->getType().getUnqualifiedType();
6832 if (!BaseType->isRecordType()) {
6837 CXXCastPath BasePath;
6838 BasePath.push_back(Base);
6840 // Construct the "from" expression, which is an implicit cast to the
6841 // appropriately-qualified base type.
6842 Expr *From = OtherRef;
6843 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals),
6844 CK_UncheckedDerivedToBase,
6845 VK_LValue, &BasePath).take();
6847 // Dereference "this".
6848 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This);
6850 // Implicitly cast "this" to the appropriately-qualified base type.
6851 To = ImpCastExprToType(To.take(),
6852 Context.getCVRQualifiedType(BaseType,
6853 CopyAssignOperator->getTypeQualifiers()),
6854 CK_UncheckedDerivedToBase,
6855 VK_LValue, &BasePath);
6858 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType,
6860 /*CopyingBaseSubobject=*/true);
6861 if (Copy.isInvalid()) {
6862 Diag(CurrentLocation, diag::note_member_synthesized_at)
6863 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
6864 CopyAssignOperator->setInvalidDecl();
6868 // Success! Record the copy.
6869 Statements.push_back(Copy.takeAs<Expr>());
6872 // \brief Reference to the __builtin_memcpy function.
6873 Expr *BuiltinMemCpyRef = 0;
6874 // \brief Reference to the __builtin_objc_memmove_collectable function.
6875 Expr *CollectableMemCpyRef = 0;
6877 // Assign non-static members.
6878 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
6879 FieldEnd = ClassDecl->field_end();
6880 Field != FieldEnd; ++Field) {
6881 // Check for members of reference type; we can't copy those.
6882 if (Field->getType()->isReferenceType()) {
6883 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
6884 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
6885 Diag(Field->getLocation(), diag::note_declared_at);
6886 Diag(CurrentLocation, diag::note_member_synthesized_at)
6887 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
6892 // Check for members of const-qualified, non-class type.
6893 QualType BaseType = Context.getBaseElementType(Field->getType());
6894 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
6895 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
6896 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
6897 Diag(Field->getLocation(), diag::note_declared_at);
6898 Diag(CurrentLocation, diag::note_member_synthesized_at)
6899 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
6904 // Suppress assigning zero-width bitfields.
6905 if (const Expr *Width = Field->getBitWidth())
6906 if (Width->EvaluateAsInt(Context) == 0)
6909 QualType FieldType = Field->getType().getNonReferenceType();
6910 if (FieldType->isIncompleteArrayType()) {
6911 assert(ClassDecl->hasFlexibleArrayMember() &&
6912 "Incomplete array type is not valid");
6916 // Build references to the field in the object we're copying from and to.
6917 CXXScopeSpec SS; // Intentionally empty
6918 LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
6920 MemberLookup.addDecl(*Field);
6921 MemberLookup.resolveKind();
6922 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType,
6923 Loc, /*IsArrow=*/false,
6924 SS, 0, MemberLookup, 0);
6925 ExprResult To = BuildMemberReferenceExpr(This, This->getType(),
6926 Loc, /*IsArrow=*/true,
6927 SS, 0, MemberLookup, 0);
6928 assert(!From.isInvalid() && "Implicit field reference cannot fail");
6929 assert(!To.isInvalid() && "Implicit field reference cannot fail");
6931 // If the field should be copied with __builtin_memcpy rather than via
6932 // explicit assignments, do so. This optimization only applies for arrays
6933 // of scalars and arrays of class type with trivial copy-assignment
6935 if (FieldType->isArrayType() &&
6936 BaseType.hasTrivialCopyAssignment(Context)) {
6937 // Compute the size of the memory buffer to be copied.
6938 QualType SizeType = Context.getSizeType();
6939 llvm::APInt Size(Context.getTypeSize(SizeType),
6940 Context.getTypeSizeInChars(BaseType).getQuantity());
6941 for (const ConstantArrayType *Array
6942 = Context.getAsConstantArrayType(FieldType);
6944 Array = Context.getAsConstantArrayType(Array->getElementType())) {
6945 llvm::APInt ArraySize
6946 = Array->getSize().zextOrTrunc(Size.getBitWidth());
6950 // Take the address of the field references for "from" and "to".
6951 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get());
6952 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get());
6954 bool NeedsCollectableMemCpy =
6955 (BaseType->isRecordType() &&
6956 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember());
6958 if (NeedsCollectableMemCpy) {
6959 if (!CollectableMemCpyRef) {
6960 // Create a reference to the __builtin_objc_memmove_collectable function.
6961 LookupResult R(*this,
6962 &Context.Idents.get("__builtin_objc_memmove_collectable"),
6963 Loc, LookupOrdinaryName);
6964 LookupName(R, TUScope, true);
6966 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>();
6967 if (!CollectableMemCpy) {
6968 // Something went horribly wrong earlier, and we will have
6969 // complained about it.
6974 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy,
6975 CollectableMemCpy->getType(),
6976 VK_LValue, Loc, 0).take();
6977 assert(CollectableMemCpyRef && "Builtin reference cannot fail");
6980 // Create a reference to the __builtin_memcpy builtin function.
6981 else if (!BuiltinMemCpyRef) {
6982 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc,
6983 LookupOrdinaryName);
6984 LookupName(R, TUScope, true);
6986 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>();
6987 if (!BuiltinMemCpy) {
6988 // Something went horribly wrong earlier, and we will have complained
6994 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy,
6995 BuiltinMemCpy->getType(),
6996 VK_LValue, Loc, 0).take();
6997 assert(BuiltinMemCpyRef && "Builtin reference cannot fail");
7000 ASTOwningVector<Expr*> CallArgs(*this);
7001 CallArgs.push_back(To.takeAs<Expr>());
7002 CallArgs.push_back(From.takeAs<Expr>());
7003 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc));
7004 ExprResult Call = ExprError();
7005 if (NeedsCollectableMemCpy)
7006 Call = ActOnCallExpr(/*Scope=*/0,
7007 CollectableMemCpyRef,
7008 Loc, move_arg(CallArgs),
7011 Call = ActOnCallExpr(/*Scope=*/0,
7013 Loc, move_arg(CallArgs),
7016 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!");
7017 Statements.push_back(Call.takeAs<Expr>());
7021 // Build the copy of this field.
7022 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType,
7023 To.get(), From.get(),
7024 /*CopyingBaseSubobject=*/false);
7025 if (Copy.isInvalid()) {
7026 Diag(CurrentLocation, diag::note_member_synthesized_at)
7027 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
7028 CopyAssignOperator->setInvalidDecl();
7032 // Success! Record the copy.
7033 Statements.push_back(Copy.takeAs<Stmt>());
7037 // Add a "return *this;"
7038 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This);
7040 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get());
7041 if (Return.isInvalid())
7044 Statements.push_back(Return.takeAs<Stmt>());
7046 if (Trap.hasErrorOccurred()) {
7047 Diag(CurrentLocation, diag::note_member_synthesized_at)
7048 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
7055 CopyAssignOperator->setInvalidDecl();
7059 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements),
7060 /*isStmtExpr=*/false);
7061 assert(!Body.isInvalid() && "Compound statement creation cannot fail");
7062 CopyAssignOperator->setBody(Body.takeAs<Stmt>());
7064 if (ASTMutationListener *L = getASTMutationListener()) {
7065 L->CompletedImplicitDefinition(CopyAssignOperator);
7069 std::pair<Sema::ImplicitExceptionSpecification, bool>
7070 Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) {
7071 if (ClassDecl->isInvalidDecl())
7072 return std::make_pair(ImplicitExceptionSpecification(Context), false);
7074 // C++ [class.copy]p5:
7075 // The implicitly-declared copy constructor for a class X will
7081 // FIXME: It ought to be possible to store this on the record.
7082 bool HasConstCopyConstructor = true;
7084 // -- each direct or virtual base class B of X has a copy
7085 // constructor whose first parameter is of type const B& or
7086 // const volatile B&, and
7087 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
7088 BaseEnd = ClassDecl->bases_end();
7089 HasConstCopyConstructor && Base != BaseEnd;
7091 // Virtual bases are handled below.
7092 if (Base->isVirtual())
7095 CXXRecordDecl *BaseClassDecl
7096 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
7097 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const,
7098 &HasConstCopyConstructor);
7101 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
7102 BaseEnd = ClassDecl->vbases_end();
7103 HasConstCopyConstructor && Base != BaseEnd;
7105 CXXRecordDecl *BaseClassDecl
7106 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
7107 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const,
7108 &HasConstCopyConstructor);
7111 // -- for all the nonstatic data members of X that are of a
7112 // class type M (or array thereof), each such class type
7113 // has a copy constructor whose first parameter is of type
7114 // const M& or const volatile M&.
7115 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
7116 FieldEnd = ClassDecl->field_end();
7117 HasConstCopyConstructor && Field != FieldEnd;
7119 QualType FieldType = Context.getBaseElementType((*Field)->getType());
7120 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
7121 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const,
7122 &HasConstCopyConstructor);
7125 // Otherwise, the implicitly declared copy constructor will have
7130 // C++ [except.spec]p14:
7131 // An implicitly declared special member function (Clause 12) shall have an
7132 // exception-specification. [...]
7133 ImplicitExceptionSpecification ExceptSpec(Context);
7134 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0;
7135 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
7136 BaseEnd = ClassDecl->bases_end();
7139 // Virtual bases are handled below.
7140 if (Base->isVirtual())
7143 CXXRecordDecl *BaseClassDecl
7144 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
7145 if (CXXConstructorDecl *CopyConstructor =
7146 LookupCopyingConstructor(BaseClassDecl, Quals))
7147 ExceptSpec.CalledDecl(CopyConstructor);
7149 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(),
7150 BaseEnd = ClassDecl->vbases_end();
7153 CXXRecordDecl *BaseClassDecl
7154 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
7155 if (CXXConstructorDecl *CopyConstructor =
7156 LookupCopyingConstructor(BaseClassDecl, Quals))
7157 ExceptSpec.CalledDecl(CopyConstructor);
7159 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
7160 FieldEnd = ClassDecl->field_end();
7163 QualType FieldType = Context.getBaseElementType((*Field)->getType());
7164 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
7165 if (CXXConstructorDecl *CopyConstructor =
7166 LookupCopyingConstructor(FieldClassDecl, Quals))
7167 ExceptSpec.CalledDecl(CopyConstructor);
7171 return std::make_pair(ExceptSpec, HasConstCopyConstructor);
7174 CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor(
7175 CXXRecordDecl *ClassDecl) {
7176 // C++ [class.copy]p4:
7177 // If the class definition does not explicitly declare a copy
7178 // constructor, one is declared implicitly.
7180 ImplicitExceptionSpecification Spec(Context);
7182 llvm::tie(Spec, Const) =
7183 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl);
7185 QualType ClassType = Context.getTypeDeclType(ClassDecl);
7186 QualType ArgType = ClassType;
7188 ArgType = ArgType.withConst();
7189 ArgType = Context.getLValueReferenceType(ArgType);
7191 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI();
7193 DeclarationName Name
7194 = Context.DeclarationNames.getCXXConstructorName(
7195 Context.getCanonicalType(ClassType));
7196 SourceLocation ClassLoc = ClassDecl->getLocation();
7197 DeclarationNameInfo NameInfo(Name, ClassLoc);
7199 // An implicitly-declared copy constructor is an inline public
7200 // member of its class.
7201 CXXConstructorDecl *CopyConstructor
7202 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo,
7203 Context.getFunctionType(Context.VoidTy,
7206 /*isExplicit=*/false,
7208 /*isImplicitlyDeclared=*/true);
7209 CopyConstructor->setAccess(AS_public);
7210 CopyConstructor->setDefaulted();
7211 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor());
7213 // Note that we have declared this constructor.
7214 ++ASTContext::NumImplicitCopyConstructorsDeclared;
7216 // Add the parameter to the constructor.
7217 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor,
7219 /*IdentifierInfo=*/0,
7220 ArgType, /*TInfo=*/0,
7223 CopyConstructor->setParams(&FromParam, 1);
7225 if (Scope *S = getScopeForContext(ClassDecl))
7226 PushOnScopeChains(CopyConstructor, S, false);
7227 ClassDecl->addDecl(CopyConstructor);
7229 // C++0x [class.copy]p7:
7230 // ... If the class definition declares a move constructor or move
7231 // assignment operator, the implicitly declared constructor is defined as
7233 if (ClassDecl->hasUserDeclaredMoveConstructor() ||
7234 ClassDecl->hasUserDeclaredMoveAssignment() ||
7235 ShouldDeleteCopyConstructor(CopyConstructor))
7236 CopyConstructor->setDeletedAsWritten();
7238 return CopyConstructor;
7241 void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
7242 CXXConstructorDecl *CopyConstructor) {
7243 assert((CopyConstructor->isDefaulted() &&
7244 CopyConstructor->isCopyConstructor() &&
7245 !CopyConstructor->doesThisDeclarationHaveABody()) &&
7246 "DefineImplicitCopyConstructor - call it for implicit copy ctor");
7248 CXXRecordDecl *ClassDecl = CopyConstructor->getParent();
7249 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor");
7251 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor);
7252 DiagnosticErrorTrap Trap(Diags);
7254 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) ||
7255 Trap.hasErrorOccurred()) {
7256 Diag(CurrentLocation, diag::note_member_synthesized_at)
7257 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl);
7258 CopyConstructor->setInvalidDecl();
7260 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(),
7261 CopyConstructor->getLocation(),
7262 MultiStmtArg(*this, 0, 0),
7263 /*isStmtExpr=*/false)
7267 CopyConstructor->setUsed();
7269 if (ASTMutationListener *L = getASTMutationListener()) {
7270 L->CompletedImplicitDefinition(CopyConstructor);
7275 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
7276 CXXConstructorDecl *Constructor,
7277 MultiExprArg ExprArgs,
7278 bool RequiresZeroInit,
7279 unsigned ConstructKind,
7280 SourceRange ParenRange) {
7281 bool Elidable = false;
7283 // C++0x [class.copy]p34:
7284 // When certain criteria are met, an implementation is allowed to
7285 // omit the copy/move construction of a class object, even if the
7286 // copy/move constructor and/or destructor for the object have
7287 // side effects. [...]
7288 // - when a temporary class object that has not been bound to a
7289 // reference (12.2) would be copied/moved to a class object
7290 // with the same cv-unqualified type, the copy/move operation
7291 // can be omitted by constructing the temporary object
7292 // directly into the target of the omitted copy/move
7293 if (ConstructKind == CXXConstructExpr::CK_Complete &&
7294 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) {
7295 Expr *SubExpr = ((Expr **)ExprArgs.get())[0];
7296 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent());
7299 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor,
7300 Elidable, move(ExprArgs), RequiresZeroInit,
7301 ConstructKind, ParenRange);
7304 /// BuildCXXConstructExpr - Creates a complete call to a constructor,
7305 /// including handling of its default argument expressions.
7307 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
7308 CXXConstructorDecl *Constructor, bool Elidable,
7309 MultiExprArg ExprArgs,
7310 bool RequiresZeroInit,
7311 unsigned ConstructKind,
7312 SourceRange ParenRange) {
7313 unsigned NumExprs = ExprArgs.size();
7314 Expr **Exprs = (Expr **)ExprArgs.release();
7316 for (specific_attr_iterator<NonNullAttr>
7317 i = Constructor->specific_attr_begin<NonNullAttr>(),
7318 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) {
7319 const NonNullAttr *NonNull = *i;
7320 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc);
7323 MarkDeclarationReferenced(ConstructLoc, Constructor);
7324 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc,
7325 Constructor, Elidable, Exprs, NumExprs,
7327 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind),
7331 bool Sema::InitializeVarWithConstructor(VarDecl *VD,
7332 CXXConstructorDecl *Constructor,
7333 MultiExprArg Exprs) {
7334 // FIXME: Provide the correct paren SourceRange when available.
7335 ExprResult TempResult =
7336 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor,
7337 move(Exprs), false, CXXConstructExpr::CK_Complete,
7339 if (TempResult.isInvalid())
7342 Expr *Temp = TempResult.takeAs<Expr>();
7343 CheckImplicitConversions(Temp, VD->getLocation());
7344 MarkDeclarationReferenced(VD->getLocation(), Constructor);
7345 Temp = MaybeCreateExprWithCleanups(Temp);
7351 void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) {
7352 if (VD->isInvalidDecl()) return;
7354 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl());
7355 if (ClassDecl->isInvalidDecl()) return;
7356 if (ClassDecl->hasTrivialDestructor()) return;
7357 if (ClassDecl->isDependentContext()) return;
7359 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl);
7360 MarkDeclarationReferenced(VD->getLocation(), Destructor);
7361 CheckDestructorAccess(VD->getLocation(), Destructor,
7362 PDiag(diag::err_access_dtor_var)
7363 << VD->getDeclName()
7366 if (!VD->hasGlobalStorage()) return;
7368 // Emit warning for non-trivial dtor in global scope (a real global,
7369 // class-static, function-static).
7370 Diag(VD->getLocation(), diag::warn_exit_time_destructor);
7372 // TODO: this should be re-enabled for static locals by !CXAAtExit
7373 if (!VD->isStaticLocal())
7374 Diag(VD->getLocation(), diag::warn_global_destructor);
7377 /// AddCXXDirectInitializerToDecl - This action is called immediately after
7378 /// ActOnDeclarator, when a C++ direct initializer is present.
7379 /// e.g: "int x(1);"
7380 void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl,
7381 SourceLocation LParenLoc,
7383 SourceLocation RParenLoc,
7384 bool TypeMayContainAuto) {
7385 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions");
7387 // If there is no declaration, there was an error parsing it. Just ignore
7392 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
7394 Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
7395 RealDecl->setInvalidDecl();
7399 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for.
7400 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) {
7401 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed
7402 if (Exprs.size() > 1) {
7403 Diag(Exprs.get()[1]->getSourceRange().getBegin(),
7404 diag::err_auto_var_init_multiple_expressions)
7405 << VDecl->getDeclName() << VDecl->getType()
7406 << VDecl->getSourceRange();
7407 RealDecl->setInvalidDecl();
7411 Expr *Init = Exprs.get()[0];
7412 TypeSourceInfo *DeducedType = 0;
7413 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType))
7414 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure)
7415 << VDecl->getDeclName() << VDecl->getType() << Init->getType()
7416 << Init->getSourceRange();
7418 RealDecl->setInvalidDecl();
7421 VDecl->setTypeSourceInfo(DeducedType);
7422 VDecl->setType(DeducedType->getType());
7424 // In ARC, infer lifetime.
7425 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl))
7426 VDecl->setInvalidDecl();
7428 // If this is a redeclaration, check that the type we just deduced matches
7429 // the previously declared type.
7430 if (VarDecl *Old = VDecl->getPreviousDeclaration())
7431 MergeVarDeclTypes(VDecl, Old);
7434 // We will represent direct-initialization similarly to copy-initialization:
7435 // int x(1); -as-> int x = 1;
7436 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c);
7438 // Clients that want to distinguish between the two forms, can check for
7439 // direct initializer using VarDecl::hasCXXDirectInitializer().
7440 // A major benefit is that clients that don't particularly care about which
7441 // exactly form was it (like the CodeGen) can handle both cases without
7442 // special case code.
7445 // The form of initialization (using parentheses or '=') is generally
7446 // insignificant, but does matter when the entity being initialized has a
7449 if (!VDecl->getType()->isDependentType() &&
7450 RequireCompleteType(VDecl->getLocation(), VDecl->getType(),
7451 diag::err_typecheck_decl_incomplete_type)) {
7452 VDecl->setInvalidDecl();
7456 // The variable can not have an abstract class type.
7457 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(),
7458 diag::err_abstract_type_in_decl,
7459 AbstractVariableType))
7460 VDecl->setInvalidDecl();
7463 if ((Def = VDecl->getDefinition()) && Def != VDecl) {
7464 Diag(VDecl->getLocation(), diag::err_redefinition)
7465 << VDecl->getDeclName();
7466 Diag(Def->getLocation(), diag::note_previous_definition);
7467 VDecl->setInvalidDecl();
7471 // C++ [class.static.data]p4
7472 // If a static data member is of const integral or const
7473 // enumeration type, its declaration in the class definition can
7474 // specify a constant-initializer which shall be an integral
7475 // constant expression (5.19). In that case, the member can appear
7476 // in integral constant expressions. The member shall still be
7477 // defined in a namespace scope if it is used in the program and the
7478 // namespace scope definition shall not contain an initializer.
7480 // We already performed a redefinition check above, but for static
7481 // data members we also need to check whether there was an in-class
7482 // declaration with an initializer.
7483 const VarDecl* PrevInit = 0;
7484 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) {
7485 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName();
7486 Diag(PrevInit->getLocation(), diag::note_previous_definition);
7490 bool IsDependent = false;
7491 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) {
7492 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) {
7493 VDecl->setInvalidDecl();
7497 if (Exprs.get()[I]->isTypeDependent())
7501 // If either the declaration has a dependent type or if any of the
7502 // expressions is type-dependent, we represent the initialization
7503 // via a ParenListExpr for later use during template instantiation.
7504 if (VDecl->getType()->isDependentType() || IsDependent) {
7505 // Let clients know that initialization was done with a direct initializer.
7506 VDecl->setCXXDirectInitializer(true);
7508 // Store the initialization expressions as a ParenListExpr.
7509 unsigned NumExprs = Exprs.size();
7510 VDecl->setInit(new (Context) ParenListExpr(
7511 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc,
7512 VDecl->getType().getNonReferenceType()));
7516 // Capture the variable that is being initialized and the style of
7518 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl);
7520 // FIXME: Poor source location information.
7521 InitializationKind Kind
7522 = InitializationKind::CreateDirect(VDecl->getLocation(),
7523 LParenLoc, RParenLoc);
7525 InitializationSequence InitSeq(*this, Entity, Kind,
7526 Exprs.get(), Exprs.size());
7527 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs));
7528 if (Result.isInvalid()) {
7529 VDecl->setInvalidDecl();
7533 CheckImplicitConversions(Result.get(), LParenLoc);
7535 Result = MaybeCreateExprWithCleanups(Result);
7536 VDecl->setInit(Result.takeAs<Expr>());
7537 VDecl->setCXXDirectInitializer(true);
7539 CheckCompleteVariableDeclaration(VDecl);
7542 /// \brief Given a constructor and the set of arguments provided for the
7543 /// constructor, convert the arguments and add any required default arguments
7544 /// to form a proper call to this constructor.
7546 /// \returns true if an error occurred, false otherwise.
7548 Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor,
7549 MultiExprArg ArgsPtr,
7551 ASTOwningVector<Expr*> &ConvertedArgs) {
7552 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall.
7553 unsigned NumArgs = ArgsPtr.size();
7554 Expr **Args = (Expr **)ArgsPtr.get();
7556 const FunctionProtoType *Proto
7557 = Constructor->getType()->getAs<FunctionProtoType>();
7558 assert(Proto && "Constructor without a prototype?");
7559 unsigned NumArgsInProto = Proto->getNumArgs();
7561 // If too few arguments are available, we'll fill in the rest with defaults.
7562 if (NumArgs < NumArgsInProto)
7563 ConvertedArgs.reserve(NumArgsInProto);
7565 ConvertedArgs.reserve(NumArgs);
7567 VariadicCallType CallType =
7568 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;
7569 llvm::SmallVector<Expr *, 8> AllArgs;
7570 bool Invalid = GatherArgumentsForCall(Loc, Constructor,
7571 Proto, 0, Args, NumArgs, AllArgs,
7573 for (unsigned i =0, size = AllArgs.size(); i < size; i++)
7574 ConvertedArgs.push_back(AllArgs[i]);
7579 CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef,
7580 const FunctionDecl *FnDecl) {
7581 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext();
7582 if (isa<NamespaceDecl>(DC)) {
7583 return SemaRef.Diag(FnDecl->getLocation(),
7584 diag::err_operator_new_delete_declared_in_namespace)
7585 << FnDecl->getDeclName();
7588 if (isa<TranslationUnitDecl>(DC) &&
7589 FnDecl->getStorageClass() == SC_Static) {
7590 return SemaRef.Diag(FnDecl->getLocation(),
7591 diag::err_operator_new_delete_declared_static)
7592 << FnDecl->getDeclName();
7599 CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl,
7600 CanQualType ExpectedResultType,
7601 CanQualType ExpectedFirstParamType,
7602 unsigned DependentParamTypeDiag,
7603 unsigned InvalidParamTypeDiag) {
7604 QualType ResultType =
7605 FnDecl->getType()->getAs<FunctionType>()->getResultType();
7607 // Check that the result type is not dependent.
7608 if (ResultType->isDependentType())
7609 return SemaRef.Diag(FnDecl->getLocation(),
7610 diag::err_operator_new_delete_dependent_result_type)
7611 << FnDecl->getDeclName() << ExpectedResultType;
7613 // Check that the result type is what we expect.
7614 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType)
7615 return SemaRef.Diag(FnDecl->getLocation(),
7616 diag::err_operator_new_delete_invalid_result_type)
7617 << FnDecl->getDeclName() << ExpectedResultType;
7619 // A function template must have at least 2 parameters.
7620 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2)
7621 return SemaRef.Diag(FnDecl->getLocation(),
7622 diag::err_operator_new_delete_template_too_few_parameters)
7623 << FnDecl->getDeclName();
7625 // The function decl must have at least 1 parameter.
7626 if (FnDecl->getNumParams() == 0)
7627 return SemaRef.Diag(FnDecl->getLocation(),
7628 diag::err_operator_new_delete_too_few_parameters)
7629 << FnDecl->getDeclName();
7631 // Check the the first parameter type is not dependent.
7632 QualType FirstParamType = FnDecl->getParamDecl(0)->getType();
7633 if (FirstParamType->isDependentType())
7634 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag)
7635 << FnDecl->getDeclName() << ExpectedFirstParamType;
7637 // Check that the first parameter type is what we expect.
7638 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() !=
7639 ExpectedFirstParamType)
7640 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag)
7641 << FnDecl->getDeclName() << ExpectedFirstParamType;
7647 CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
7648 // C++ [basic.stc.dynamic.allocation]p1:
7649 // A program is ill-formed if an allocation function is declared in a
7650 // namespace scope other than global scope or declared static in global
7652 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
7655 CanQualType SizeTy =
7656 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType());
7658 // C++ [basic.stc.dynamic.allocation]p1:
7659 // The return type shall be void*. The first parameter shall have type
7661 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy,
7663 diag::err_operator_new_dependent_param_type,
7664 diag::err_operator_new_param_type))
7667 // C++ [basic.stc.dynamic.allocation]p1:
7668 // The first parameter shall not have an associated default argument.
7669 if (FnDecl->getParamDecl(0)->hasDefaultArg())
7670 return SemaRef.Diag(FnDecl->getLocation(),
7671 diag::err_operator_new_default_arg)
7672 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange();
7678 CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
7679 // C++ [basic.stc.dynamic.deallocation]p1:
7680 // A program is ill-formed if deallocation functions are declared in a
7681 // namespace scope other than global scope or declared static in global
7683 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
7686 // C++ [basic.stc.dynamic.deallocation]p2:
7687 // Each deallocation function shall return void and its first parameter
7689 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy,
7690 SemaRef.Context.VoidPtrTy,
7691 diag::err_operator_delete_dependent_param_type,
7692 diag::err_operator_delete_param_type))
7698 /// CheckOverloadedOperatorDeclaration - Check whether the declaration
7699 /// of this overloaded operator is well-formed. If so, returns false;
7700 /// otherwise, emits appropriate diagnostics and returns true.
7701 bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
7702 assert(FnDecl && FnDecl->isOverloadedOperator() &&
7703 "Expected an overloaded operator declaration");
7705 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator();
7707 // C++ [over.oper]p5:
7708 // The allocation and deallocation functions, operator new,
7709 // operator new[], operator delete and operator delete[], are
7710 // described completely in 3.7.3. The attributes and restrictions
7711 // found in the rest of this subclause do not apply to them unless
7712 // explicitly stated in 3.7.3.
7713 if (Op == OO_Delete || Op == OO_Array_Delete)
7714 return CheckOperatorDeleteDeclaration(*this, FnDecl);
7716 if (Op == OO_New || Op == OO_Array_New)
7717 return CheckOperatorNewDeclaration(*this, FnDecl);
7719 // C++ [over.oper]p6:
7720 // An operator function shall either be a non-static member
7721 // function or be a non-member function and have at least one
7722 // parameter whose type is a class, a reference to a class, an
7723 // enumeration, or a reference to an enumeration.
7724 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) {
7725 if (MethodDecl->isStatic())
7726 return Diag(FnDecl->getLocation(),
7727 diag::err_operator_overload_static) << FnDecl->getDeclName();
7729 bool ClassOrEnumParam = false;
7730 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(),
7731 ParamEnd = FnDecl->param_end();
7732 Param != ParamEnd; ++Param) {
7733 QualType ParamType = (*Param)->getType().getNonReferenceType();
7734 if (ParamType->isDependentType() || ParamType->isRecordType() ||
7735 ParamType->isEnumeralType()) {
7736 ClassOrEnumParam = true;
7741 if (!ClassOrEnumParam)
7742 return Diag(FnDecl->getLocation(),
7743 diag::err_operator_overload_needs_class_or_enum)
7744 << FnDecl->getDeclName();
7747 // C++ [over.oper]p8:
7748 // An operator function cannot have default arguments (8.3.6),
7749 // except where explicitly stated below.
7751 // Only the function-call operator allows default arguments
7752 // (C++ [over.call]p1).
7753 if (Op != OO_Call) {
7754 for (FunctionDecl::param_iterator Param = FnDecl->param_begin();
7755 Param != FnDecl->param_end(); ++Param) {
7756 if ((*Param)->hasDefaultArg())
7757 return Diag((*Param)->getLocation(),
7758 diag::err_operator_overload_default_arg)
7759 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange();
7763 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = {
7764 { false, false, false }
7765 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
7766 , { Unary, Binary, MemberOnly }
7767 #include "clang/Basic/OperatorKinds.def"
7770 bool CanBeUnaryOperator = OperatorUses[Op][0];
7771 bool CanBeBinaryOperator = OperatorUses[Op][1];
7772 bool MustBeMemberOperator = OperatorUses[Op][2];
7774 // C++ [over.oper]p8:
7775 // [...] Operator functions cannot have more or fewer parameters
7776 // than the number required for the corresponding operator, as
7777 // described in the rest of this subclause.
7778 unsigned NumParams = FnDecl->getNumParams()
7779 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0);
7780 if (Op != OO_Call &&
7781 ((NumParams == 1 && !CanBeUnaryOperator) ||
7782 (NumParams == 2 && !CanBeBinaryOperator) ||
7783 (NumParams < 1) || (NumParams > 2))) {
7784 // We have the wrong number of parameters.
7786 if (CanBeUnaryOperator && CanBeBinaryOperator) {
7787 ErrorKind = 2; // 2 -> unary or binary.
7788 } else if (CanBeUnaryOperator) {
7789 ErrorKind = 0; // 0 -> unary
7791 assert(CanBeBinaryOperator &&
7792 "All non-call overloaded operators are unary or binary!");
7793 ErrorKind = 1; // 1 -> binary
7796 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be)
7797 << FnDecl->getDeclName() << NumParams << ErrorKind;
7800 // Overloaded operators other than operator() cannot be variadic.
7801 if (Op != OO_Call &&
7802 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) {
7803 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic)
7804 << FnDecl->getDeclName();
7807 // Some operators must be non-static member functions.
7808 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) {
7809 return Diag(FnDecl->getLocation(),
7810 diag::err_operator_overload_must_be_member)
7811 << FnDecl->getDeclName();
7814 // C++ [over.inc]p1:
7815 // The user-defined function called operator++ implements the
7816 // prefix and postfix ++ operator. If this function is a member
7817 // function with no parameters, or a non-member function with one
7818 // parameter of class or enumeration type, it defines the prefix
7819 // increment operator ++ for objects of that type. If the function
7820 // is a member function with one parameter (which shall be of type
7821 // int) or a non-member function with two parameters (the second
7822 // of which shall be of type int), it defines the postfix
7823 // increment operator ++ for objects of that type.
7824 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) {
7825 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1);
7826 bool ParamIsInt = false;
7827 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>())
7828 ParamIsInt = BT->getKind() == BuiltinType::Int;
7831 return Diag(LastParam->getLocation(),
7832 diag::err_operator_overload_post_incdec_must_be_int)
7833 << LastParam->getType() << (Op == OO_MinusMinus);
7839 /// CheckLiteralOperatorDeclaration - Check whether the declaration
7840 /// of this literal operator function is well-formed. If so, returns
7841 /// false; otherwise, emits appropriate diagnostics and returns true.
7842 bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) {
7843 DeclContext *DC = FnDecl->getDeclContext();
7844 Decl::Kind Kind = DC->getDeclKind();
7845 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace &&
7846 Kind != Decl::LinkageSpec) {
7847 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace)
7848 << FnDecl->getDeclName();
7854 // template <char...> type operator "" name() is the only valid template
7855 // signature, and the only valid signature with no parameters.
7856 if (FnDecl->param_size() == 0) {
7857 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) {
7858 // Must have only one template parameter
7859 TemplateParameterList *Params = TpDecl->getTemplateParameters();
7860 if (Params->size() == 1) {
7861 NonTypeTemplateParmDecl *PmDecl =
7862 cast<NonTypeTemplateParmDecl>(Params->getParam(0));
7864 // The template parameter must be a char parameter pack.
7865 if (PmDecl && PmDecl->isTemplateParameterPack() &&
7866 Context.hasSameType(PmDecl->getType(), Context.CharTy))
7871 // Check the first parameter
7872 FunctionDecl::param_iterator Param = FnDecl->param_begin();
7874 QualType T = (*Param)->getType();
7876 // unsigned long long int, long double, and any character type are allowed
7877 // as the only parameters.
7878 if (Context.hasSameType(T, Context.UnsignedLongLongTy) ||
7879 Context.hasSameType(T, Context.LongDoubleTy) ||
7880 Context.hasSameType(T, Context.CharTy) ||
7881 Context.hasSameType(T, Context.WCharTy) ||
7882 Context.hasSameType(T, Context.Char16Ty) ||
7883 Context.hasSameType(T, Context.Char32Ty)) {
7884 if (++Param == FnDecl->param_end())
7886 goto FinishedParams;
7889 // Otherwise it must be a pointer to const; let's strip those qualifiers.
7890 const PointerType *PT = T->getAs<PointerType>();
7892 goto FinishedParams;
7893 T = PT->getPointeeType();
7894 if (!T.isConstQualified())
7895 goto FinishedParams;
7896 T = T.getUnqualifiedType();
7898 // Move on to the second parameter;
7901 // If there is no second parameter, the first must be a const char *
7902 if (Param == FnDecl->param_end()) {
7903 if (Context.hasSameType(T, Context.CharTy))
7905 goto FinishedParams;
7908 // const char *, const wchar_t*, const char16_t*, and const char32_t*
7909 // are allowed as the first parameter to a two-parameter function
7910 if (!(Context.hasSameType(T, Context.CharTy) ||
7911 Context.hasSameType(T, Context.WCharTy) ||
7912 Context.hasSameType(T, Context.Char16Ty) ||
7913 Context.hasSameType(T, Context.Char32Ty)))
7914 goto FinishedParams;
7916 // The second and final parameter must be an std::size_t
7917 T = (*Param)->getType().getUnqualifiedType();
7918 if (Context.hasSameType(T, Context.getSizeType()) &&
7919 ++Param == FnDecl->param_end())
7923 // FIXME: This diagnostic is absolutely terrible.
7926 Diag(FnDecl->getLocation(), diag::err_literal_operator_params)
7927 << FnDecl->getDeclName();
7934 /// ActOnStartLinkageSpecification - Parsed the beginning of a C++
7935 /// linkage specification, including the language and (if present)
7936 /// the '{'. ExternLoc is the location of the 'extern', LangLoc is
7937 /// the location of the language string literal, which is provided
7938 /// by Lang/StrSize. LBraceLoc, if valid, provides the location of
7939 /// the '{' brace. Otherwise, this linkage specification does not
7940 /// have any braces.
7941 Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc,
7942 SourceLocation LangLoc,
7943 llvm::StringRef Lang,
7944 SourceLocation LBraceLoc) {
7945 LinkageSpecDecl::LanguageIDs Language;
7946 if (Lang == "\"C\"")
7947 Language = LinkageSpecDecl::lang_c;
7948 else if (Lang == "\"C++\"")
7949 Language = LinkageSpecDecl::lang_cxx;
7951 Diag(LangLoc, diag::err_bad_language);
7955 // FIXME: Add all the various semantics of linkage specifications
7957 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext,
7958 ExternLoc, LangLoc, Language);
7959 CurContext->addDecl(D);
7960 PushDeclContext(S, D);
7964 /// ActOnFinishLinkageSpecification - Complete the definition of
7965 /// the C++ linkage specification LinkageSpec. If RBraceLoc is
7966 /// valid, it's the position of the closing '}' brace in a linkage
7967 /// specification that uses braces.
7968 Decl *Sema::ActOnFinishLinkageSpecification(Scope *S,
7970 SourceLocation RBraceLoc) {
7972 if (RBraceLoc.isValid()) {
7973 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec);
7974 LSDecl->setRBraceLoc(RBraceLoc);
7981 /// \brief Perform semantic analysis for the variable declaration that
7982 /// occurs within a C++ catch clause, returning the newly-created
7984 VarDecl *Sema::BuildExceptionDeclaration(Scope *S,
7985 TypeSourceInfo *TInfo,
7986 SourceLocation StartLoc,
7988 IdentifierInfo *Name) {
7989 bool Invalid = false;
7990 QualType ExDeclType = TInfo->getType();
7992 // Arrays and functions decay.
7993 if (ExDeclType->isArrayType())
7994 ExDeclType = Context.getArrayDecayedType(ExDeclType);
7995 else if (ExDeclType->isFunctionType())
7996 ExDeclType = Context.getPointerType(ExDeclType);
7998 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type.
7999 // The exception-declaration shall not denote a pointer or reference to an
8000 // incomplete type, other than [cv] void*.
8001 // N2844 forbids rvalue references.
8002 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) {
8003 Diag(Loc, diag::err_catch_rvalue_ref);
8007 // GCC allows catching pointers and references to incomplete types
8008 // as an extension; so do we, but we warn by default.
8010 QualType BaseType = ExDeclType;
8011 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference
8012 unsigned DK = diag::err_catch_incomplete;
8013 bool IncompleteCatchIsInvalid = true;
8014 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
8015 BaseType = Ptr->getPointeeType();
8017 DK = diag::ext_catch_incomplete_ptr;
8018 IncompleteCatchIsInvalid = false;
8019 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) {
8020 // For the purpose of error recovery, we treat rvalue refs like lvalue refs.
8021 BaseType = Ref->getPointeeType();
8023 DK = diag::ext_catch_incomplete_ref;
8024 IncompleteCatchIsInvalid = false;
8026 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) &&
8027 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) &&
8028 IncompleteCatchIsInvalid)
8031 if (!Invalid && !ExDeclType->isDependentType() &&
8032 RequireNonAbstractType(Loc, ExDeclType,
8033 diag::err_abstract_type_in_decl,
8034 AbstractVariableType))
8037 // Only the non-fragile NeXT runtime currently supports C++ catches
8038 // of ObjC types, and no runtime supports catching ObjC types by value.
8039 if (!Invalid && getLangOptions().ObjC1) {
8040 QualType T = ExDeclType;
8041 if (const ReferenceType *RT = T->getAs<ReferenceType>())
8042 T = RT->getPointeeType();
8044 if (T->isObjCObjectType()) {
8045 Diag(Loc, diag::err_objc_object_catch);
8047 } else if (T->isObjCObjectPointerType()) {
8048 if (!getLangOptions().ObjCNonFragileABI)
8049 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile);
8053 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name,
8054 ExDeclType, TInfo, SC_None, SC_None);
8055 ExDecl->setExceptionVariable(true);
8057 if (!Invalid && !ExDeclType->isDependentType()) {
8058 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) {
8059 // C++ [except.handle]p16:
8060 // The object declared in an exception-declaration or, if the
8061 // exception-declaration does not specify a name, a temporary (12.2) is
8062 // copy-initialized (8.5) from the exception object. [...]
8063 // The object is destroyed when the handler exits, after the destruction
8064 // of any automatic objects initialized within the handler.
8066 // We just pretend to initialize the object with itself, then make sure
8067 // it can be destroyed later.
8068 QualType initType = ExDeclType;
8070 InitializedEntity entity =
8071 InitializedEntity::InitializeVariable(ExDecl);
8072 InitializationKind initKind =
8073 InitializationKind::CreateCopy(Loc, SourceLocation());
8076 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary);
8077 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1);
8078 ExprResult result = sequence.Perform(*this, entity, initKind,
8079 MultiExprArg(&opaqueValue, 1));
8080 if (result.isInvalid())
8083 // If the constructor used was non-trivial, set this as the
8085 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take());
8086 if (!construct->getConstructor()->isTrivial()) {
8087 Expr *init = MaybeCreateExprWithCleanups(construct);
8088 ExDecl->setInit(init);
8091 // And make sure it's destructable.
8092 FinalizeVarWithDestructor(ExDecl, recordType);
8098 ExDecl->setInvalidDecl();
8103 /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
8105 Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
8106 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
8107 bool Invalid = D.isInvalidType();
8109 // Check for unexpanded parameter packs.
8110 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
8111 UPPC_ExceptionType)) {
8112 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
8113 D.getIdentifierLoc());
8117 IdentifierInfo *II = D.getIdentifier();
8118 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(),
8120 ForRedeclaration)) {
8121 // The scope should be freshly made just for us. There is just no way
8122 // it contains any previous declaration.
8123 assert(!S->isDeclScope(PrevDecl));
8124 if (PrevDecl->isTemplateParameter()) {
8125 // Maybe we will complain about the shadowed template parameter.
8126 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
8130 if (D.getCXXScopeSpec().isSet() && !Invalid) {
8131 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator)
8132 << D.getCXXScopeSpec().getRange();
8136 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo,
8137 D.getSourceRange().getBegin(),
8138 D.getIdentifierLoc(),
8141 ExDecl->setInvalidDecl();
8143 // Add the exception declaration into this scope.
8145 PushOnScopeChains(ExDecl, S);
8147 CurContext->addDecl(ExDecl);
8149 ProcessDeclAttributes(S, ExDecl, D);
8153 Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc,
8155 Expr *AssertMessageExpr_,
8156 SourceLocation RParenLoc) {
8157 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_);
8159 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) {
8160 llvm::APSInt Value(32);
8161 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) {
8162 Diag(StaticAssertLoc,
8163 diag::err_static_assert_expression_is_not_constant) <<
8164 AssertExpr->getSourceRange();
8169 Diag(StaticAssertLoc, diag::err_static_assert_failed)
8170 << AssertMessage->getString() << AssertExpr->getSourceRange();
8174 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression))
8177 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc,
8178 AssertExpr, AssertMessage, RParenLoc);
8180 CurContext->addDecl(Decl);
8184 /// \brief Perform semantic analysis of the given friend type declaration.
8186 /// \returns A friend declaration that.
8187 FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc,
8188 TypeSourceInfo *TSInfo) {
8189 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration");
8191 QualType T = TSInfo->getType();
8192 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange();
8194 if (!getLangOptions().CPlusPlus0x) {
8195 // C++03 [class.friend]p2:
8196 // An elaborated-type-specifier shall be used in a friend declaration
8199 // * The class-key of the elaborated-type-specifier is required.
8200 if (!ActiveTemplateInstantiations.empty()) {
8201 // Do not complain about the form of friend template types during
8202 // template instantiation; we will already have complained when the
8203 // template was declared.
8204 } else if (!T->isElaboratedTypeSpecifier()) {
8205 // If we evaluated the type to a record type, suggest putting
8207 if (const RecordType *RT = T->getAs<RecordType>()) {
8208 RecordDecl *RD = RT->getDecl();
8210 std::string InsertionText = std::string(" ") + RD->getKindName();
8212 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type)
8213 << (unsigned) RD->getTagKind()
8215 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc),
8218 Diag(FriendLoc, diag::ext_nonclass_type_friend)
8220 << SourceRange(FriendLoc, TypeRange.getEnd());
8222 } else if (T->getAs<EnumType>()) {
8223 Diag(FriendLoc, diag::ext_enum_friend)
8225 << SourceRange(FriendLoc, TypeRange.getEnd());
8229 // C++0x [class.friend]p3:
8230 // If the type specifier in a friend declaration designates a (possibly
8231 // cv-qualified) class type, that class is declared as a friend; otherwise,
8232 // the friend declaration is ignored.
8234 // FIXME: C++0x has some syntactic restrictions on friend type declarations
8235 // in [class.friend]p3 that we do not implement.
8237 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc);
8240 /// Handle a friend tag declaration where the scope specifier was
8242 Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc,
8243 unsigned TagSpec, SourceLocation TagLoc,
8245 IdentifierInfo *Name, SourceLocation NameLoc,
8246 AttributeList *Attr,
8247 MultiTemplateParamsArg TempParamLists) {
8248 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
8250 bool isExplicitSpecialization = false;
8251 bool Invalid = false;
8253 if (TemplateParameterList *TemplateParams
8254 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS,
8255 TempParamLists.get(),
8256 TempParamLists.size(),
8258 isExplicitSpecialization,
8260 if (TemplateParams->size() > 0) {
8261 // This is a declaration of a class template.
8265 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc,
8266 SS, Name, NameLoc, Attr,
8267 TemplateParams, AS_public,
8268 TempParamLists.size() - 1,
8269 (TemplateParameterList**) TempParamLists.release()).take();
8271 // The "template<>" header is extraneous.
8272 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
8273 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
8274 isExplicitSpecialization = true;
8278 if (Invalid) return 0;
8280 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?");
8282 bool isAllExplicitSpecializations = true;
8283 for (unsigned I = TempParamLists.size(); I-- > 0; ) {
8284 if (TempParamLists.get()[I]->size()) {
8285 isAllExplicitSpecializations = false;
8290 // FIXME: don't ignore attributes.
8292 // If it's explicit specializations all the way down, just forget
8293 // about the template header and build an appropriate non-templated
8294 // friend. TODO: for source fidelity, remember the headers.
8295 if (isAllExplicitSpecializations) {
8296 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
8297 ElaboratedTypeKeyword Keyword
8298 = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
8299 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc,
8304 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
8305 if (isa<DependentNameType>(T)) {
8306 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc());
8307 TL.setKeywordLoc(TagLoc);
8308 TL.setQualifierLoc(QualifierLoc);
8309 TL.setNameLoc(NameLoc);
8311 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc());
8312 TL.setKeywordLoc(TagLoc);
8313 TL.setQualifierLoc(QualifierLoc);
8314 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc);
8317 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
8319 Friend->setAccess(AS_public);
8320 CurContext->addDecl(Friend);
8324 // Handle the case of a templated-scope friend class. e.g.
8325 // template <class T> class A<T>::B;
8326 // FIXME: we don't support these right now.
8327 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
8328 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name);
8329 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
8330 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc());
8331 TL.setKeywordLoc(TagLoc);
8332 TL.setQualifierLoc(SS.getWithLocInContext(Context));
8333 TL.setNameLoc(NameLoc);
8335 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
8337 Friend->setAccess(AS_public);
8338 Friend->setUnsupportedFriend(true);
8339 CurContext->addDecl(Friend);
8344 /// Handle a friend type declaration. This works in tandem with
8347 /// Notes on friend class templates:
8349 /// We generally treat friend class declarations as if they were
8350 /// declaring a class. So, for example, the elaborated type specifier
8351 /// in a friend declaration is required to obey the restrictions of a
8352 /// class-head (i.e. no typedefs in the scope chain), template
8353 /// parameters are required to match up with simple template-ids, &c.
8354 /// However, unlike when declaring a template specialization, it's
8355 /// okay to refer to a template specialization without an empty
8356 /// template parameter declaration, e.g.
8357 /// friend class A<T>::B<unsigned>;
8358 /// We permit this as a special case; if there are any template
8359 /// parameters present at all, require proper matching, i.e.
8360 /// template <> template <class T> friend class A<int>::B;
8361 Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
8362 MultiTemplateParamsArg TempParams) {
8363 SourceLocation Loc = DS.getSourceRange().getBegin();
8365 assert(DS.isFriendSpecified());
8366 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
8368 // Try to convert the decl specifier to a type. This works for
8369 // friend templates because ActOnTag never produces a ClassTemplateDecl
8370 // for a TUK_Friend.
8371 Declarator TheDeclarator(DS, Declarator::MemberContext);
8372 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S);
8373 QualType T = TSI->getType();
8374 if (TheDeclarator.isInvalidType())
8377 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration))
8380 // This is definitely an error in C++98. It's probably meant to
8381 // be forbidden in C++0x, too, but the specification is just
8384 // The problem is with declarations like the following:
8385 // template <T> friend A<T>::foo;
8386 // where deciding whether a class C is a friend or not now hinges
8387 // on whether there exists an instantiation of A that causes
8388 // 'foo' to equal C. There are restrictions on class-heads
8389 // (which we declare (by fiat) elaborated friend declarations to
8390 // be) that makes this tractable.
8392 // FIXME: handle "template <> friend class A<T>;", which
8393 // is possibly well-formed? Who even knows?
8394 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) {
8395 Diag(Loc, diag::err_tagless_friend_type_template)
8396 << DS.getSourceRange();
8400 // C++98 [class.friend]p1: A friend of a class is a function
8401 // or class that is not a member of the class . . .
8402 // This is fixed in DR77, which just barely didn't make the C++03
8403 // deadline. It's also a very silly restriction that seriously
8404 // affects inner classes and which nobody else seems to implement;
8405 // thus we never diagnose it, not even in -pedantic.
8407 // But note that we could warn about it: it's always useless to
8408 // friend one of your own members (it's not, however, worthless to
8409 // friend a member of an arbitrary specialization of your template).
8412 if (unsigned NumTempParamLists = TempParams.size())
8413 D = FriendTemplateDecl::Create(Context, CurContext, Loc,
8415 TempParams.release(),
8417 DS.getFriendSpecLoc());
8419 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI);
8424 D->setAccess(AS_public);
8425 CurContext->addDecl(D);
8430 Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition,
8431 MultiTemplateParamsArg TemplateParams) {
8432 const DeclSpec &DS = D.getDeclSpec();
8434 assert(DS.isFriendSpecified());
8435 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
8437 SourceLocation Loc = D.getIdentifierLoc();
8438 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
8439 QualType T = TInfo->getType();
8441 // C++ [class.friend]p1
8442 // A friend of a class is a function or class....
8443 // Note that this sees through typedefs, which is intended.
8444 // It *doesn't* see through dependent types, which is correct
8445 // according to [temp.arg.type]p3:
8446 // If a declaration acquires a function type through a
8447 // type dependent on a template-parameter and this causes
8448 // a declaration that does not use the syntactic form of a
8449 // function declarator to have a function type, the program
8451 if (!T->isFunctionType()) {
8452 Diag(Loc, diag::err_unexpected_friend);
8454 // It might be worthwhile to try to recover by creating an
8455 // appropriate declaration.
8459 // C++ [namespace.memdef]p3
8460 // - If a friend declaration in a non-local class first declares a
8461 // class or function, the friend class or function is a member
8462 // of the innermost enclosing namespace.
8463 // - The name of the friend is not found by simple name lookup
8464 // until a matching declaration is provided in that namespace
8465 // scope (either before or after the class declaration granting
8467 // - If a friend function is called, its name may be found by the
8468 // name lookup that considers functions from namespaces and
8469 // classes associated with the types of the function arguments.
8470 // - When looking for a prior declaration of a class or a function
8471 // declared as a friend, scopes outside the innermost enclosing
8472 // namespace scope are not considered.
8474 CXXScopeSpec &SS = D.getCXXScopeSpec();
8475 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
8476 DeclarationName Name = NameInfo.getName();
8479 // Check for unexpanded parameter packs.
8480 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) ||
8481 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) ||
8482 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration))
8485 // The context we found the declaration in, or in which we should
8486 // create the declaration.
8489 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
8492 // FIXME: there are different rules in local classes
8494 // There are four cases here.
8495 // - There's no scope specifier, in which case we just go to the
8496 // appropriate scope and look for a function or function template
8497 // there as appropriate.
8498 // Recover from invalid scope qualifiers as if they just weren't there.
8499 if (SS.isInvalid() || !SS.isSet()) {
8500 // C++0x [namespace.memdef]p3:
8501 // If the name in a friend declaration is neither qualified nor
8502 // a template-id and the declaration is a function or an
8503 // elaborated-type-specifier, the lookup to determine whether
8504 // the entity has been previously declared shall not consider
8505 // any scopes outside the innermost enclosing namespace.
8506 // C++0x [class.friend]p11:
8507 // If a friend declaration appears in a local class and the name
8508 // specified is an unqualified name, a prior declaration is
8509 // looked up without considering scopes that are outside the
8510 // innermost enclosing non-class scope. For a friend function
8511 // declaration, if there is no prior declaration, the program is
8513 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass();
8514 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId;
8516 // Find the appropriate context according to the above.
8519 // Skip class contexts. If someone can cite chapter and verse
8520 // for this behavior, that would be nice --- it's what GCC and
8521 // EDG do, and it seems like a reasonable intent, but the spec
8522 // really only says that checks for unqualified existing
8523 // declarations should stop at the nearest enclosing namespace,
8524 // not that they should only consider the nearest enclosing
8526 while (DC->isRecord())
8527 DC = DC->getParent();
8529 LookupQualifiedName(Previous, DC);
8531 // TODO: decide what we think about using declarations.
8532 if (isLocal || !Previous.empty())
8536 if (isa<TranslationUnitDecl>(DC)) break;
8538 if (DC->isFileContext()) break;
8540 DC = DC->getParent();
8543 // C++ [class.friend]p1: A friend of a class is a function or
8544 // class that is not a member of the class . . .
8545 // C++0x changes this for both friend types and functions.
8546 // Most C++ 98 compilers do seem to give an error here, so
8548 if (!Previous.empty() && DC->Equals(CurContext)
8549 && !getLangOptions().CPlusPlus0x)
8550 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member);
8552 DCScope = getScopeForDeclContext(S, DC);
8554 // - There's a non-dependent scope specifier, in which case we
8555 // compute it and do a previous lookup there for a function
8556 // or function template.
8557 } else if (!SS.getScopeRep()->isDependent()) {
8558 DC = computeDeclContext(SS);
8561 if (RequireCompleteDeclContext(SS, DC)) return 0;
8563 LookupQualifiedName(Previous, DC);
8565 // Ignore things found implicitly in the wrong scope.
8566 // TODO: better diagnostics for this case. Suggesting the right
8567 // qualified scope would be nice...
8568 LookupResult::Filter F = Previous.makeFilter();
8569 while (F.hasNext()) {
8570 NamedDecl *D = F.next();
8571 if (!DC->InEnclosingNamespaceSetOf(
8572 D->getDeclContext()->getRedeclContext()))
8577 if (Previous.empty()) {
8579 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T;
8583 // C++ [class.friend]p1: A friend of a class is a function or
8584 // class that is not a member of the class . . .
8585 if (DC->Equals(CurContext))
8586 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member);
8588 // - There's a scope specifier that does not match any template
8589 // parameter lists, in which case we use some arbitrary context,
8590 // create a method or method template, and wait for instantiation.
8591 // - There's a scope specifier that does match some template
8592 // parameter lists, which we don't handle right now.
8595 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?");
8598 if (!DC->isRecord()) {
8599 // This implies that it has to be an operator or function.
8600 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ||
8601 D.getName().getKind() == UnqualifiedId::IK_DestructorName ||
8602 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) {
8603 Diag(Loc, diag::err_introducing_special_friend) <<
8604 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 :
8605 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2);
8610 bool Redeclaration = false;
8611 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous,
8612 move(TemplateParams),
8617 assert(ND->getDeclContext() == DC);
8618 assert(ND->getLexicalDeclContext() == CurContext);
8620 // Add the function declaration to the appropriate lookup tables,
8621 // adjusting the redeclarations list as necessary. We don't
8622 // want to do this yet if the friending class is dependent.
8624 // Also update the scope-based lookup if the target context's
8625 // lookup context is in lexical scope.
8626 if (!CurContext->isDependentContext()) {
8627 DC = DC->getRedeclContext();
8628 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false);
8629 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
8630 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false);
8633 FriendDecl *FrD = FriendDecl::Create(Context, CurContext,
8634 D.getIdentifierLoc(), ND,
8635 DS.getFriendSpecLoc());
8636 FrD->setAccess(AS_public);
8637 CurContext->addDecl(FrD);
8639 if (ND->isInvalidDecl())
8640 FrD->setInvalidDecl();
8643 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND))
8644 FD = FTD->getTemplatedDecl();
8646 FD = cast<FunctionDecl>(ND);
8648 // Mark templated-scope function declarations as unsupported.
8649 if (FD->getNumTemplateParameterLists())
8650 FrD->setUnsupportedFriend(true);
8656 void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) {
8657 AdjustDeclIfTemplate(Dcl);
8659 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl);
8661 Diag(DelLoc, diag::err_deleted_non_function);
8664 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) {
8665 Diag(DelLoc, diag::err_deleted_decl_not_first);
8666 Diag(Prev->getLocation(), diag::note_previous_declaration);
8667 // If the declaration wasn't the first, we delete the function anyway for
8670 Fn->setDeletedAsWritten();
8673 void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) {
8674 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl);
8677 if (MD->getParent()->isDependentType()) {
8679 MD->setExplicitlyDefaulted();
8683 CXXSpecialMember Member = getSpecialMember(MD);
8684 if (Member == CXXInvalid) {
8685 Diag(DefaultLoc, diag::err_default_special_members);
8690 MD->setExplicitlyDefaulted();
8692 // If this definition appears within the record, do the checking when
8693 // the record is complete.
8694 const FunctionDecl *Primary = MD;
8695 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate)
8696 // Find the uninstantiated declaration that actually had the '= default'
8698 MD->getTemplateInstantiationPattern()->isDefined(Primary);
8700 if (Primary == Primary->getCanonicalDecl())
8704 case CXXDefaultConstructor: {
8705 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD);
8706 CheckExplicitlyDefaultedDefaultConstructor(CD);
8707 if (!CD->isInvalidDecl())
8708 DefineImplicitDefaultConstructor(DefaultLoc, CD);
8712 case CXXCopyConstructor: {
8713 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD);
8714 CheckExplicitlyDefaultedCopyConstructor(CD);
8715 if (!CD->isInvalidDecl())
8716 DefineImplicitCopyConstructor(DefaultLoc, CD);
8720 case CXXCopyAssignment: {
8721 CheckExplicitlyDefaultedCopyAssignment(MD);
8722 if (!MD->isInvalidDecl())
8723 DefineImplicitCopyAssignment(DefaultLoc, MD);
8727 case CXXDestructor: {
8728 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD);
8729 CheckExplicitlyDefaultedDestructor(DD);
8730 if (!DD->isInvalidDecl())
8731 DefineImplicitDestructor(DefaultLoc, DD);
8735 case CXXMoveConstructor:
8736 case CXXMoveAssignment:
8737 Diag(Dcl->getLocation(), diag::err_defaulted_move_unsupported);
8741 // FIXME: Do the rest once we have move functions
8745 Diag(DefaultLoc, diag::err_default_special_members);
8749 static void SearchForReturnInStmt(Sema &Self, Stmt *S) {
8750 for (Stmt::child_range CI = S->children(); CI; ++CI) {
8751 Stmt *SubStmt = *CI;
8754 if (isa<ReturnStmt>(SubStmt))
8755 Self.Diag(SubStmt->getSourceRange().getBegin(),
8756 diag::err_return_in_constructor_handler);
8757 if (!isa<Expr>(SubStmt))
8758 SearchForReturnInStmt(Self, SubStmt);
8762 void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) {
8763 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) {
8764 CXXCatchStmt *Handler = TryBlock->getHandler(I);
8765 SearchForReturnInStmt(*this, Handler);
8769 bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
8770 const CXXMethodDecl *Old) {
8771 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType();
8772 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType();
8774 if (Context.hasSameType(NewTy, OldTy) ||
8775 NewTy->isDependentType() || OldTy->isDependentType())
8778 // Check if the return types are covariant
8779 QualType NewClassTy, OldClassTy;
8781 /// Both types must be pointers or references to classes.
8782 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) {
8783 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) {
8784 NewClassTy = NewPT->getPointeeType();
8785 OldClassTy = OldPT->getPointeeType();
8787 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) {
8788 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) {
8789 if (NewRT->getTypeClass() == OldRT->getTypeClass()) {
8790 NewClassTy = NewRT->getPointeeType();
8791 OldClassTy = OldRT->getPointeeType();
8796 // The return types aren't either both pointers or references to a class type.
8797 if (NewClassTy.isNull()) {
8798 Diag(New->getLocation(),
8799 diag::err_different_return_type_for_overriding_virtual_function)
8800 << New->getDeclName() << NewTy << OldTy;
8801 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
8806 // C++ [class.virtual]p6:
8807 // If the return type of D::f differs from the return type of B::f, the
8808 // class type in the return type of D::f shall be complete at the point of
8809 // declaration of D::f or shall be the class type D.
8810 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) {
8811 if (!RT->isBeingDefined() &&
8812 RequireCompleteType(New->getLocation(), NewClassTy,
8813 PDiag(diag::err_covariant_return_incomplete)
8814 << New->getDeclName()))
8818 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) {
8819 // Check if the new class derives from the old class.
8820 if (!IsDerivedFrom(NewClassTy, OldClassTy)) {
8821 Diag(New->getLocation(),
8822 diag::err_covariant_return_not_derived)
8823 << New->getDeclName() << NewTy << OldTy;
8824 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
8828 // Check if we the conversion from derived to base is valid.
8829 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy,
8830 diag::err_covariant_return_inaccessible_base,
8831 diag::err_covariant_return_ambiguous_derived_to_base_conv,
8832 // FIXME: Should this point to the return type?
8833 New->getLocation(), SourceRange(), New->getDeclName(), 0)) {
8834 // FIXME: this note won't trigger for delayed access control
8835 // diagnostics, and it's impossible to get an undelayed error
8836 // here from access control during the original parse because
8837 // the ParsingDeclSpec/ParsingDeclarator are still in scope.
8838 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
8843 // The qualifiers of the return types must be the same.
8844 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) {
8845 Diag(New->getLocation(),
8846 diag::err_covariant_return_type_different_qualifications)
8847 << New->getDeclName() << NewTy << OldTy;
8848 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
8853 // The new class type must have the same or less qualifiers as the old type.
8854 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) {
8855 Diag(New->getLocation(),
8856 diag::err_covariant_return_type_class_type_more_qualified)
8857 << New->getDeclName() << NewTy << OldTy;
8858 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
8865 /// \brief Mark the given method pure.
8867 /// \param Method the method to be marked pure.
8869 /// \param InitRange the source range that covers the "0" initializer.
8870 bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) {
8871 SourceLocation EndLoc = InitRange.getEnd();
8872 if (EndLoc.isValid())
8873 Method->setRangeEnd(EndLoc);
8875 if (Method->isVirtual() || Method->getParent()->isDependentContext()) {
8880 if (!Method->isInvalidDecl())
8881 Diag(Method->getLocation(), diag::err_non_virtual_pure)
8882 << Method->getDeclName() << InitRange;
8886 /// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse
8887 /// an initializer for the out-of-line declaration 'Dcl'. The scope
8888 /// is a fresh scope pushed for just this purpose.
8890 /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
8891 /// static data member of class X, names should be looked up in the scope of
8893 void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) {
8894 // If there is no declaration, there was an error parsing it.
8895 if (D == 0 || D->isInvalidDecl()) return;
8897 // We should only get called for declarations with scope specifiers, like:
8899 assert(D->isOutOfLine());
8900 EnterDeclaratorContext(S, D->getDeclContext());
8903 /// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an
8904 /// initializer for the out-of-line declaration 'D'.
8905 void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) {
8906 // If there is no declaration, there was an error parsing it.
8907 if (D == 0 || D->isInvalidDecl()) return;
8909 assert(D->isOutOfLine());
8910 ExitDeclaratorContext(S);
8913 /// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a
8914 /// C++ if/switch/while/for statement.
8915 /// e.g: "if (int x = f()) {...}"
8916 DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) {
8918 // The declarator shall not specify a function or an array.
8919 // The type-specifier-seq shall not contain typedef and shall not declare a
8920 // new class or enumeration.
8921 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
8922 "Parser allowed 'typedef' as storage class of condition decl.");
8924 Decl *Dcl = ActOnDeclarator(S, D);
8928 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function.
8929 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type)
8930 << D.getSourceRange();
8937 void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class,
8938 bool DefinitionRequired) {
8939 // Ignore any vtable uses in unevaluated operands or for classes that do
8940 // not have a vtable.
8941 if (!Class->isDynamicClass() || Class->isDependentContext() ||
8942 CurContext->isDependentContext() ||
8943 ExprEvalContexts.back().Context == Unevaluated)
8946 // Try to insert this class into the map.
8947 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl());
8948 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool>
8949 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired));
8951 // If we already had an entry, check to see if we are promoting this vtable
8952 // to required a definition. If so, we need to reappend to the VTableUses
8953 // list, since we may have already processed the first entry.
8954 if (DefinitionRequired && !Pos.first->second) {
8955 Pos.first->second = true;
8957 // Otherwise, we can early exit.
8962 // Local classes need to have their virtual members marked
8963 // immediately. For all other classes, we mark their virtual members
8964 // at the end of the translation unit.
8965 if (Class->isLocalClass())
8966 MarkVirtualMembersReferenced(Loc, Class);
8968 VTableUses.push_back(std::make_pair(Class, Loc));
8971 bool Sema::DefineUsedVTables() {
8972 if (VTableUses.empty())
8975 // Note: The VTableUses vector could grow as a result of marking
8976 // the members of a class as "used", so we check the size each
8977 // time through the loop and prefer indices (with are stable) to
8978 // iterators (which are not).
8979 bool DefinedAnything = false;
8980 for (unsigned I = 0; I != VTableUses.size(); ++I) {
8981 CXXRecordDecl *Class = VTableUses[I].first->getDefinition();
8985 SourceLocation Loc = VTableUses[I].second;
8987 // If this class has a key function, but that key function is
8988 // defined in another translation unit, we don't need to emit the
8989 // vtable even though we're using it.
8990 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class);
8991 if (KeyFunction && !KeyFunction->hasBody()) {
8992 switch (KeyFunction->getTemplateSpecializationKind()) {
8993 case TSK_Undeclared:
8994 case TSK_ExplicitSpecialization:
8995 case TSK_ExplicitInstantiationDeclaration:
8996 // The key function is in another translation unit.
8999 case TSK_ExplicitInstantiationDefinition:
9000 case TSK_ImplicitInstantiation:
9001 // We will be instantiating the key function.
9004 } else if (!KeyFunction) {
9005 // If we have a class with no key function that is the subject
9006 // of an explicit instantiation declaration, suppress the
9007 // vtable; it will live with the explicit instantiation
9009 bool IsExplicitInstantiationDeclaration
9010 = Class->getTemplateSpecializationKind()
9011 == TSK_ExplicitInstantiationDeclaration;
9012 for (TagDecl::redecl_iterator R = Class->redecls_begin(),
9013 REnd = Class->redecls_end();
9015 TemplateSpecializationKind TSK
9016 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind();
9017 if (TSK == TSK_ExplicitInstantiationDeclaration)
9018 IsExplicitInstantiationDeclaration = true;
9019 else if (TSK == TSK_ExplicitInstantiationDefinition) {
9020 IsExplicitInstantiationDeclaration = false;
9025 if (IsExplicitInstantiationDeclaration)
9029 // Mark all of the virtual members of this class as referenced, so
9030 // that we can build a vtable. Then, tell the AST consumer that a
9031 // vtable for this class is required.
9032 DefinedAnything = true;
9033 MarkVirtualMembersReferenced(Loc, Class);
9034 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl());
9035 Consumer.HandleVTable(Class, VTablesUsed[Canonical]);
9037 // Optionally warn if we're emitting a weak vtable.
9038 if (Class->getLinkage() == ExternalLinkage &&
9039 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) {
9040 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined()))
9041 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class;
9046 return DefinedAnything;
9049 void Sema::MarkVirtualMembersReferenced(SourceLocation Loc,
9050 const CXXRecordDecl *RD) {
9051 for (CXXRecordDecl::method_iterator i = RD->method_begin(),
9052 e = RD->method_end(); i != e; ++i) {
9053 CXXMethodDecl *MD = *i;
9055 // C++ [basic.def.odr]p2:
9056 // [...] A virtual member function is used if it is not pure. [...]
9057 if (MD->isVirtual() && !MD->isPure())
9058 MarkDeclarationReferenced(Loc, MD);
9061 // Only classes that have virtual bases need a VTT.
9062 if (RD->getNumVBases() == 0)
9065 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(),
9066 e = RD->bases_end(); i != e; ++i) {
9067 const CXXRecordDecl *Base =
9068 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl());
9069 if (Base->getNumVBases() == 0)
9071 MarkVirtualMembersReferenced(Loc, Base);
9075 /// SetIvarInitializers - This routine builds initialization ASTs for the
9076 /// Objective-C implementation whose ivars need be initialized.
9077 void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) {
9078 if (!getLangOptions().CPlusPlus)
9080 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) {
9081 llvm::SmallVector<ObjCIvarDecl*, 8> ivars;
9082 CollectIvarsToConstructOrDestruct(OID, ivars);
9085 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit;
9086 for (unsigned i = 0; i < ivars.size(); i++) {
9087 FieldDecl *Field = ivars[i];
9088 if (Field->isInvalidDecl())
9091 CXXCtorInitializer *Member;
9092 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field);
9093 InitializationKind InitKind =
9094 InitializationKind::CreateDefault(ObjCImplementation->getLocation());
9096 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0);
9097 ExprResult MemberInit =
9098 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg());
9099 MemberInit = MaybeCreateExprWithCleanups(MemberInit);
9100 // Note, MemberInit could actually come back empty if no initialization
9101 // is required (e.g., because it would call a trivial default constructor)
9102 if (!MemberInit.get() || MemberInit.isInvalid())
9106 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(),
9108 MemberInit.takeAs<Expr>(),
9110 AllToInit.push_back(Member);
9112 // Be sure that the destructor is accessible and is marked as referenced.
9113 if (const RecordType *RecordTy
9114 = Context.getBaseElementType(Field->getType())
9115 ->getAs<RecordType>()) {
9116 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl());
9117 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) {
9118 MarkDeclarationReferenced(Field->getLocation(), Destructor);
9119 CheckDestructorAccess(Field->getLocation(), Destructor,
9120 PDiag(diag::err_access_dtor_ivar)
9121 << Context.getBaseElementType(Field->getType()));
9125 ObjCImplementation->setIvarInitializers(Context,
9126 AllToInit.data(), AllToInit.size());
9131 void DelegatingCycleHelper(CXXConstructorDecl* Ctor,
9132 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid,
9133 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid,
9134 llvm::SmallSet<CXXConstructorDecl*, 4> &Current,
9136 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(),
9138 if (Ctor->isInvalidDecl())
9141 const FunctionDecl *FNTarget = 0;
9142 CXXConstructorDecl *Target;
9144 // We ignore the result here since if we don't have a body, Target will be
9146 (void)Ctor->getTargetConstructor()->hasBody(FNTarget);
9148 = const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget));
9150 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(),
9151 // Avoid dereferencing a null pointer here.
9152 *TCanonical = Target ? Target->getCanonicalDecl() : 0;
9154 if (!Current.insert(Canonical))
9157 // We know that beyond here, we aren't chaining into a cycle.
9158 if (!Target || !Target->isDelegatingConstructor() ||
9159 Target->isInvalidDecl() || Valid.count(TCanonical)) {
9160 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI)
9163 // We've hit a cycle.
9164 } else if (TCanonical == Canonical || Invalid.count(TCanonical) ||
9165 Current.count(TCanonical)) {
9166 // If we haven't diagnosed this cycle yet, do so now.
9167 if (!Invalid.count(TCanonical)) {
9168 S.Diag((*Ctor->init_begin())->getSourceLocation(),
9169 diag::warn_delegating_ctor_cycle)
9172 // Don't add a note for a function delegating directo to itself.
9173 if (TCanonical != Canonical)
9174 S.Diag(Target->getLocation(), diag::note_it_delegates_to);
9176 CXXConstructorDecl *C = Target;
9177 while (C->getCanonicalDecl() != Canonical) {
9178 (void)C->getTargetConstructor()->hasBody(FNTarget);
9179 assert(FNTarget && "Ctor cycle through bodiless function");
9182 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget));
9183 S.Diag(C->getLocation(), diag::note_which_delegates_to);
9187 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI)
9188 Invalid.insert(*CI);
9191 DelegatingCycleHelper(Target, Valid, Invalid, Current, S);
9196 void Sema::CheckDelegatingCtorCycles() {
9197 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current;
9199 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(),
9202 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator
9203 I = DelegatingCtorDecls.begin(),
9204 E = DelegatingCtorDecls.end();
9206 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this);
9209 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI)
9210 (*CI)->setInvalidDecl();