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 //===----------------------------------------------------------------------===//
15 #include "clang/AST/ASTConsumer.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/CXXInheritance.h"
18 #include "clang/AST/DeclVisitor.h"
19 #include "clang/AST/TypeOrdering.h"
20 #include "clang/AST/StmtVisitor.h"
21 #include "clang/Basic/PartialDiagnostic.h"
22 #include "clang/Lex/Preprocessor.h"
23 #include "clang/Parse/DeclSpec.h"
24 #include "llvm/ADT/STLExtras.h"
25 #include "llvm/Support/Compiler.h"
26 #include <algorithm> // for std::equal
30 using namespace clang;
32 //===----------------------------------------------------------------------===//
33 // CheckDefaultArgumentVisitor
34 //===----------------------------------------------------------------------===//
37 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses
38 /// the default argument of a parameter to determine whether it
39 /// contains any ill-formed subexpressions. For example, this will
40 /// diagnose the use of local variables or parameters within the
41 /// default argument expression.
42 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor
43 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> {
48 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
49 : DefaultArg(defarg), S(s) {}
51 bool VisitExpr(Expr *Node);
52 bool VisitDeclRefExpr(DeclRefExpr *DRE);
53 bool VisitCXXThisExpr(CXXThisExpr *ThisE);
56 /// VisitExpr - Visit all of the children of this expression.
57 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) {
58 bool IsInvalid = false;
59 for (Stmt::child_iterator I = Node->child_begin(),
60 E = Node->child_end(); I != E; ++I)
61 IsInvalid |= Visit(*I);
65 /// VisitDeclRefExpr - Visit a reference to a declaration, to
66 /// determine whether this declaration can be used in the default
67 /// argument expression.
68 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) {
69 NamedDecl *Decl = DRE->getDecl();
70 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) {
71 // C++ [dcl.fct.default]p9
72 // Default arguments are evaluated each time the function is
73 // called. The order of evaluation of function arguments is
74 // unspecified. Consequently, parameters of a function shall not
75 // be used in default argument expressions, even if they are not
76 // evaluated. Parameters of a function declared before a default
77 // argument expression are in scope and can hide namespace and
78 // class member names.
79 return S->Diag(DRE->getSourceRange().getBegin(),
80 diag::err_param_default_argument_references_param)
81 << Param->getDeclName() << DefaultArg->getSourceRange();
82 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) {
83 // C++ [dcl.fct.default]p7
84 // Local variables shall not be used in default argument
86 if (VDecl->isBlockVarDecl())
87 return S->Diag(DRE->getSourceRange().getBegin(),
88 diag::err_param_default_argument_references_local)
89 << VDecl->getDeclName() << DefaultArg->getSourceRange();
95 /// VisitCXXThisExpr - Visit a C++ "this" expression.
96 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) {
97 // C++ [dcl.fct.default]p8:
98 // The keyword this shall not be used in a default argument of a
100 return S->Diag(ThisE->getSourceRange().getBegin(),
101 diag::err_param_default_argument_references_this)
102 << ThisE->getSourceRange();
107 Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg,
108 SourceLocation EqualLoc) {
109 QualType ParamType = Param->getType();
111 if (RequireCompleteType(Param->getLocation(), Param->getType(),
112 diag::err_typecheck_decl_incomplete_type)) {
113 Param->setInvalidDecl();
117 Expr *Arg = (Expr *)DefaultArg.get();
119 // C++ [dcl.fct.default]p5
120 // A default argument expression is implicitly converted (clause
121 // 4) to the parameter type. The default argument expression has
122 // the same semantic constraints as the initializer expression in
123 // a declaration of a variable of the parameter type, using the
124 // copy-initialization semantics (8.5).
125 if (CheckInitializerTypes(Arg, ParamType, EqualLoc,
126 Param->getDeclName(), /*DirectInit=*/false))
129 Arg = MaybeCreateCXXExprWithTemporaries(Arg, /*DestroyTemps=*/false);
131 // Okay: add the default argument to the parameter
132 Param->setDefaultArg(Arg);
134 DefaultArg.release();
139 /// ActOnParamDefaultArgument - Check whether the default argument
140 /// provided for a function parameter is well-formed. If so, attach it
141 /// to the parameter declaration.
143 Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc,
145 if (!param || !defarg.get())
148 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>());
149 UnparsedDefaultArgLocs.erase(Param);
151 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>());
152 QualType ParamType = Param->getType();
154 // Default arguments are only permitted in C++
155 if (!getLangOptions().CPlusPlus) {
156 Diag(EqualLoc, diag::err_param_default_argument)
157 << DefaultArg->getSourceRange();
158 Param->setInvalidDecl();
162 // Check that the default argument is well-formed
163 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this);
164 if (DefaultArgChecker.Visit(DefaultArg.get())) {
165 Param->setInvalidDecl();
169 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc);
172 /// ActOnParamUnparsedDefaultArgument - We've seen a default
173 /// argument for a function parameter, but we can't parse it yet
174 /// because we're inside a class definition. Note that this default
175 /// argument will be parsed later.
176 void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param,
177 SourceLocation EqualLoc,
178 SourceLocation ArgLoc) {
182 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>());
184 Param->setUnparsedDefaultArg();
186 UnparsedDefaultArgLocs[Param] = ArgLoc;
189 /// ActOnParamDefaultArgumentError - Parsing or semantic analysis of
190 /// the default argument for the parameter param failed.
191 void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) {
195 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>());
197 Param->setInvalidDecl();
199 UnparsedDefaultArgLocs.erase(Param);
202 /// CheckExtraCXXDefaultArguments - Check for any extra default
203 /// arguments in the declarator, which is not a function declaration
204 /// or definition and therefore is not permitted to have default
205 /// arguments. This routine should be invoked for every declarator
206 /// that is not a function declaration or definition.
207 void Sema::CheckExtraCXXDefaultArguments(Declarator &D) {
208 // C++ [dcl.fct.default]p3
209 // A default argument expression shall be specified only in the
210 // parameter-declaration-clause of a function declaration or in a
211 // template-parameter (14.1). It shall not be specified for a
212 // parameter pack. If it is specified in a
213 // parameter-declaration-clause, it shall not occur within a
214 // declarator or abstract-declarator of a parameter-declaration.
215 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
216 DeclaratorChunk &chunk = D.getTypeObject(i);
217 if (chunk.Kind == DeclaratorChunk::Function) {
218 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) {
220 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>());
221 if (Param->hasUnparsedDefaultArg()) {
222 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens;
223 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
224 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation());
226 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0;
227 } else if (Param->getDefaultArg()) {
228 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
229 << Param->getDefaultArg()->getSourceRange();
230 Param->setDefaultArg(0);
237 // MergeCXXFunctionDecl - Merge two declarations of the same C++
238 // function, once we already know that they have the same
239 // type. Subroutine of MergeFunctionDecl. Returns true if there was an
240 // error, false otherwise.
241 bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) {
242 bool Invalid = false;
244 // C++ [dcl.fct.default]p4:
245 // For non-template functions, default arguments can be added in
246 // later declarations of a function in the same
247 // scope. Declarations in different scopes have completely
248 // distinct sets of default arguments. That is, declarations in
249 // inner scopes do not acquire default arguments from
250 // declarations in outer scopes, and vice versa. In a given
251 // function declaration, all parameters subsequent to a
252 // parameter with a default argument shall have default
253 // arguments supplied in this or previous declarations. A
254 // default argument shall not be redefined by a later
255 // declaration (not even to the same value).
257 // C++ [dcl.fct.default]p6:
258 // Except for member functions of class templates, the default arguments
259 // in a member function definition that appears outside of the class
260 // definition are added to the set of default arguments provided by the
261 // member function declaration in the class definition.
262 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) {
263 ParmVarDecl *OldParam = Old->getParamDecl(p);
264 ParmVarDecl *NewParam = New->getParamDecl(p);
266 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) {
267 Diag(NewParam->getLocation(),
268 diag::err_param_default_argument_redefinition)
269 << NewParam->getDefaultArgRange();
271 // Look for the function declaration where the default argument was
272 // actually written, which may be a declaration prior to Old.
273 for (FunctionDecl *Older = Old->getPreviousDeclaration();
274 Older; Older = Older->getPreviousDeclaration()) {
275 if (!Older->getParamDecl(p)->hasDefaultArg())
278 OldParam = Older->getParamDecl(p);
281 Diag(OldParam->getLocation(), diag::note_previous_definition)
282 << OldParam->getDefaultArgRange();
284 } else if (OldParam->hasDefaultArg()) {
285 // Merge the old default argument into the new parameter
286 if (OldParam->hasUninstantiatedDefaultArg())
287 NewParam->setUninstantiatedDefaultArg(
288 OldParam->getUninstantiatedDefaultArg());
290 NewParam->setDefaultArg(OldParam->getDefaultArg());
291 } else if (NewParam->hasDefaultArg()) {
292 if (New->getDescribedFunctionTemplate()) {
293 // Paragraph 4, quoted above, only applies to non-template functions.
294 Diag(NewParam->getLocation(),
295 diag::err_param_default_argument_template_redecl)
296 << NewParam->getDefaultArgRange();
297 Diag(Old->getLocation(), diag::note_template_prev_declaration)
299 } else if (New->getTemplateSpecializationKind()
300 != TSK_ImplicitInstantiation &&
301 New->getTemplateSpecializationKind() != TSK_Undeclared) {
302 // C++ [temp.expr.spec]p21:
303 // Default function arguments shall not be specified in a declaration
304 // or a definition for one of the following explicit specializations:
305 // - the explicit specialization of a function template;
306 // - the explicit specialization of a member function template;
307 // - the explicit specialization of a member function of a class
308 // template where the class template specialization to which the
309 // member function specialization belongs is implicitly
311 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg)
312 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization)
313 << New->getDeclName()
314 << NewParam->getDefaultArgRange();
315 } else if (New->getDeclContext()->isDependentContext()) {
316 // C++ [dcl.fct.default]p6 (DR217):
317 // Default arguments for a member function of a class template shall
318 // be specified on the initial declaration of the member function
319 // within the class template.
321 // Reading the tea leaves a bit in DR217 and its reference to DR205
322 // leads me to the conclusion that one cannot add default function
323 // arguments for an out-of-line definition of a member function of a
326 if (CXXRecordDecl *Record
327 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) {
328 if (Record->getDescribedClassTemplate())
330 else if (isa<ClassTemplatePartialSpecializationDecl>(Record))
336 Diag(NewParam->getLocation(),
337 diag::err_param_default_argument_member_template_redecl)
339 << NewParam->getDefaultArgRange();
344 if (CheckEquivalentExceptionSpec(
345 Old->getType()->getAs<FunctionProtoType>(), Old->getLocation(),
346 New->getType()->getAs<FunctionProtoType>(), New->getLocation())) {
353 /// CheckCXXDefaultArguments - Verify that the default arguments for a
354 /// function declaration are well-formed according to C++
355 /// [dcl.fct.default].
356 void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) {
357 unsigned NumParams = FD->getNumParams();
360 // Find first parameter with a default argument
361 for (p = 0; p < NumParams; ++p) {
362 ParmVarDecl *Param = FD->getParamDecl(p);
363 if (Param->hasDefaultArg())
367 // C++ [dcl.fct.default]p4:
368 // In a given function declaration, all parameters
369 // subsequent to a parameter with a default argument shall
370 // have default arguments supplied in this or previous
371 // declarations. A default argument shall not be redefined
372 // by a later declaration (not even to the same value).
373 unsigned LastMissingDefaultArg = 0;
374 for (; p < NumParams; ++p) {
375 ParmVarDecl *Param = FD->getParamDecl(p);
376 if (!Param->hasDefaultArg()) {
377 if (Param->isInvalidDecl())
378 /* We already complained about this parameter. */;
379 else if (Param->getIdentifier())
380 Diag(Param->getLocation(),
381 diag::err_param_default_argument_missing_name)
382 << Param->getIdentifier();
384 Diag(Param->getLocation(),
385 diag::err_param_default_argument_missing);
387 LastMissingDefaultArg = p;
391 if (LastMissingDefaultArg > 0) {
392 // Some default arguments were missing. Clear out all of the
393 // default arguments up to (and including) the last missing
394 // default argument, so that we leave the function parameters
395 // in a semantically valid state.
396 for (p = 0; p <= LastMissingDefaultArg; ++p) {
397 ParmVarDecl *Param = FD->getParamDecl(p);
398 if (Param->hasDefaultArg()) {
399 if (!Param->hasUnparsedDefaultArg())
400 Param->getDefaultArg()->Destroy(Context);
401 Param->setDefaultArg(0);
407 /// isCurrentClassName - Determine whether the identifier II is the
408 /// name of the class type currently being defined. In the case of
409 /// nested classes, this will only return true if II is the name of
410 /// the innermost class.
411 bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *,
412 const CXXScopeSpec *SS) {
413 CXXRecordDecl *CurDecl;
414 if (SS && SS->isSet() && !SS->isInvalid()) {
415 DeclContext *DC = computeDeclContext(*SS, true);
416 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
418 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
421 return &II == CurDecl->getIdentifier();
426 /// \brief Check the validity of a C++ base class specifier.
428 /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics
429 /// and returns NULL otherwise.
431 Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
432 SourceRange SpecifierRange,
433 bool Virtual, AccessSpecifier Access,
435 SourceLocation BaseLoc) {
436 // C++ [class.union]p1:
437 // A union shall not have base classes.
438 if (Class->isUnion()) {
439 Diag(Class->getLocation(), diag::err_base_clause_on_union)
444 if (BaseType->isDependentType())
445 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
446 Class->getTagKind() == RecordDecl::TK_class,
449 // Base specifiers must be record types.
450 if (!BaseType->isRecordType()) {
451 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange;
455 // C++ [class.union]p1:
456 // A union shall not be used as a base class.
457 if (BaseType->isUnionType()) {
458 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange;
462 // C++ [class.derived]p2:
463 // The class-name in a base-specifier shall not be an incompletely
465 if (RequireCompleteType(BaseLoc, BaseType,
466 PDiag(diag::err_incomplete_base_class)
470 // If the base class is polymorphic or isn't empty, the new one is/isn't, too.
471 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl();
472 assert(BaseDecl && "Record type has no declaration");
473 BaseDecl = BaseDecl->getDefinition(Context);
474 assert(BaseDecl && "Base type is not incomplete, but has no definition");
475 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl);
476 assert(CXXBaseDecl && "Base type is not a C++ type");
477 if (!CXXBaseDecl->isEmpty())
478 Class->setEmpty(false);
479 if (CXXBaseDecl->isPolymorphic())
480 Class->setPolymorphic(true);
482 // C++ [dcl.init.aggr]p1:
483 // An aggregate is [...] a class with [...] no base classes [...].
484 Class->setAggregate(false);
485 Class->setPOD(false);
488 // C++ [class.ctor]p5:
489 // A constructor is trivial if its class has no virtual base classes.
490 Class->setHasTrivialConstructor(false);
492 // C++ [class.copy]p6:
493 // A copy constructor is trivial if its class has no virtual base classes.
494 Class->setHasTrivialCopyConstructor(false);
496 // C++ [class.copy]p11:
497 // A copy assignment operator is trivial if its class has no virtual
499 Class->setHasTrivialCopyAssignment(false);
501 // C++0x [meta.unary.prop] is_empty:
502 // T is a class type, but not a union type, with ... no virtual base
504 Class->setEmpty(false);
506 // C++ [class.ctor]p5:
507 // A constructor is trivial if all the direct base classes of its
508 // class have trivial constructors.
509 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor())
510 Class->setHasTrivialConstructor(false);
512 // C++ [class.copy]p6:
513 // A copy constructor is trivial if all the direct base classes of its
514 // class have trivial copy constructors.
515 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor())
516 Class->setHasTrivialCopyConstructor(false);
518 // C++ [class.copy]p11:
519 // A copy assignment operator is trivial if all the direct base classes
520 // of its class have trivial copy assignment operators.
521 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment())
522 Class->setHasTrivialCopyAssignment(false);
525 // C++ [class.ctor]p3:
526 // A destructor is trivial if all the direct base classes of its class
527 // have trivial destructors.
528 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor())
529 Class->setHasTrivialDestructor(false);
531 // Create the base specifier.
532 // FIXME: Allocate via ASTContext?
533 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
534 Class->getTagKind() == RecordDecl::TK_class,
538 /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
539 /// one entry in the base class list of a class specifier, for
541 /// class foo : public bar, virtual private baz {
542 /// 'public bar' and 'virtual private baz' are each base-specifiers.
544 Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange,
545 bool Virtual, AccessSpecifier Access,
546 TypeTy *basetype, SourceLocation BaseLoc) {
550 AdjustDeclIfTemplate(classdecl);
551 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>());
552 QualType BaseType = GetTypeFromParser(basetype);
553 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange,
561 /// \brief Performs the actual work of attaching the given base class
562 /// specifiers to a C++ class.
563 bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases,
568 // Used to keep track of which base types we have already seen, so
569 // that we can properly diagnose redundant direct base types. Note
570 // that the key is always the unqualified canonical type of the base
572 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes;
574 // Copy non-redundant base specifiers into permanent storage.
575 unsigned NumGoodBases = 0;
576 bool Invalid = false;
577 for (unsigned idx = 0; idx < NumBases; ++idx) {
579 = Context.getCanonicalType(Bases[idx]->getType());
580 NewBaseType = NewBaseType.getUnqualifiedType();
582 if (KnownBaseTypes[NewBaseType]) {
584 // A class shall not be specified as a direct base class of a
585 // derived class more than once.
586 Diag(Bases[idx]->getSourceRange().getBegin(),
587 diag::err_duplicate_base_class)
588 << KnownBaseTypes[NewBaseType]->getType()
589 << Bases[idx]->getSourceRange();
591 // Delete the duplicate base class specifier; we're going to
592 // overwrite its pointer later.
593 Context.Deallocate(Bases[idx]);
597 // Okay, add this new base class.
598 KnownBaseTypes[NewBaseType] = Bases[idx];
599 Bases[NumGoodBases++] = Bases[idx];
603 // Attach the remaining base class specifiers to the derived class.
604 Class->setBases(Context, Bases, NumGoodBases);
606 // Delete the remaining (good) base class specifiers, since their
607 // data has been copied into the CXXRecordDecl.
608 for (unsigned idx = 0; idx < NumGoodBases; ++idx)
609 Context.Deallocate(Bases[idx]);
614 /// ActOnBaseSpecifiers - Attach the given base specifiers to the
615 /// class, after checking whether there are any duplicate base
617 void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases,
619 if (!ClassDecl || !Bases || !NumBases)
622 AdjustDeclIfTemplate(ClassDecl);
623 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()),
624 (CXXBaseSpecifier**)(Bases), NumBases);
627 /// \brief Determine whether the type \p Derived is a C++ class that is
628 /// derived from the type \p Base.
629 bool Sema::IsDerivedFrom(QualType Derived, QualType Base) {
630 if (!getLangOptions().CPlusPlus)
633 const RecordType *DerivedRT = Derived->getAs<RecordType>();
637 const RecordType *BaseRT = Base->getAs<RecordType>();
641 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl());
642 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
643 return DerivedRD->isDerivedFrom(BaseRD);
646 /// \brief Determine whether the type \p Derived is a C++ class that is
647 /// derived from the type \p Base.
648 bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) {
649 if (!getLangOptions().CPlusPlus)
652 const RecordType *DerivedRT = Derived->getAs<RecordType>();
656 const RecordType *BaseRT = Base->getAs<RecordType>();
660 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl());
661 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
662 return DerivedRD->isDerivedFrom(BaseRD, Paths);
665 /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base
666 /// conversion (where Derived and Base are class types) is
667 /// well-formed, meaning that the conversion is unambiguous (and
668 /// that all of the base classes are accessible). Returns true
669 /// and emits a diagnostic if the code is ill-formed, returns false
670 /// otherwise. Loc is the location where this routine should point to
671 /// if there is an error, and Range is the source range to highlight
672 /// if there is an error.
674 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
675 unsigned InaccessibleBaseID,
676 unsigned AmbigiousBaseConvID,
677 SourceLocation Loc, SourceRange Range,
678 DeclarationName Name) {
679 // First, determine whether the path from Derived to Base is
680 // ambiguous. This is slightly more expensive than checking whether
681 // the Derived to Base conversion exists, because here we need to
682 // explore multiple paths to determine if there is an ambiguity.
683 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
684 /*DetectVirtual=*/false);
685 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths);
686 assert(DerivationOkay &&
687 "Can only be used with a derived-to-base conversion");
688 (void)DerivationOkay;
690 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) {
691 // Check that the base class can be accessed.
692 return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc,
696 // We know that the derived-to-base conversion is ambiguous, and
697 // we're going to produce a diagnostic. Perform the derived-to-base
698 // search just one more time to compute all of the possible paths so
699 // that we can print them out. This is more expensive than any of
700 // the previous derived-to-base checks we've done, but at this point
701 // performance isn't as much of an issue.
703 Paths.setRecordingPaths(true);
704 bool StillOkay = IsDerivedFrom(Derived, Base, Paths);
705 assert(StillOkay && "Can only be used with a derived-to-base conversion");
708 // Build up a textual representation of the ambiguous paths, e.g.,
709 // D -> B -> A, that will be used to illustrate the ambiguous
710 // conversions in the diagnostic. We only print one of the paths
711 // to each base class subobject.
712 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths);
714 Diag(Loc, AmbigiousBaseConvID)
715 << Derived << Base << PathDisplayStr << Range << Name;
720 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
721 SourceLocation Loc, SourceRange Range) {
722 return CheckDerivedToBaseConversion(Derived, Base,
723 diag::err_conv_to_inaccessible_base,
724 diag::err_ambiguous_derived_to_base_conv,
725 Loc, Range, DeclarationName());
729 /// @brief Builds a string representing ambiguous paths from a
730 /// specific derived class to different subobjects of the same base
733 /// This function builds a string that can be used in error messages
734 /// to show the different paths that one can take through the
735 /// inheritance hierarchy to go from the derived class to different
736 /// subobjects of a base class. The result looks something like this:
738 /// struct D -> struct B -> struct A
739 /// struct D -> struct C -> struct A
741 std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) {
742 std::string PathDisplayStr;
743 std::set<unsigned> DisplayedPaths;
744 for (CXXBasePaths::paths_iterator Path = Paths.begin();
745 Path != Paths.end(); ++Path) {
746 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) {
747 // We haven't displayed a path to this particular base
748 // class subobject yet.
749 PathDisplayStr += "\n ";
750 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString();
751 for (CXXBasePath::const_iterator Element = Path->begin();
752 Element != Path->end(); ++Element)
753 PathDisplayStr += " -> " + Element->Base->getType().getAsString();
757 return PathDisplayStr;
760 //===----------------------------------------------------------------------===//
761 // C++ class member Handling
762 //===----------------------------------------------------------------------===//
764 /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member
765 /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the
766 /// bitfield width if there is one and 'InitExpr' specifies the initializer if
769 Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
770 MultiTemplateParamsArg TemplateParameterLists,
771 ExprTy *BW, ExprTy *InitExpr, bool Deleted) {
772 const DeclSpec &DS = D.getDeclSpec();
773 DeclarationName Name = GetNameForDeclarator(D);
774 Expr *BitWidth = static_cast<Expr*>(BW);
775 Expr *Init = static_cast<Expr*>(InitExpr);
776 SourceLocation Loc = D.getIdentifierLoc();
778 bool isFunc = D.isFunctionDeclarator();
780 assert(!DS.isFriendSpecified());
782 // C++ 9.2p6: A member shall not be declared to have automatic storage
783 // duration (auto, register) or with the extern storage-class-specifier.
784 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class
785 // data members and cannot be applied to names declared const or static,
786 // and cannot be applied to reference members.
787 switch (DS.getStorageClassSpec()) {
788 case DeclSpec::SCS_unspecified:
789 case DeclSpec::SCS_typedef:
790 case DeclSpec::SCS_static:
793 case DeclSpec::SCS_mutable:
795 if (DS.getStorageClassSpecLoc().isValid())
796 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function);
798 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function);
800 // FIXME: It would be nicer if the keyword was ignored only for this
801 // declarator. Otherwise we could get follow-up errors.
802 D.getMutableDeclSpec().ClearStorageClassSpecs();
804 QualType T = GetTypeForDeclarator(D, S);
805 diag::kind err = static_cast<diag::kind>(0);
806 if (T->isReferenceType())
807 err = diag::err_mutable_reference;
808 else if (T.isConstQualified())
809 err = diag::err_mutable_const;
811 if (DS.getStorageClassSpecLoc().isValid())
812 Diag(DS.getStorageClassSpecLoc(), err);
814 Diag(DS.getThreadSpecLoc(), err);
815 // FIXME: It would be nicer if the keyword was ignored only for this
816 // declarator. Otherwise we could get follow-up errors.
817 D.getMutableDeclSpec().ClearStorageClassSpecs();
822 if (DS.getStorageClassSpecLoc().isValid())
823 Diag(DS.getStorageClassSpecLoc(),
824 diag::err_storageclass_invalid_for_member);
826 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member);
827 D.getMutableDeclSpec().ClearStorageClassSpecs();
831 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename &&
832 D.getNumTypeObjects() == 0) {
833 // Check also for this case:
838 QualType TDType = GetTypeFromParser(DS.getTypeRep());
839 isFunc = TDType->isFunctionType();
842 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
843 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
848 // FIXME: Check for template parameters!
849 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth,
851 assert(Member && "HandleField never returns null");
853 Member = HandleDeclarator(S, D, move(TemplateParameterLists), false)
856 if (BitWidth) DeleteExpr(BitWidth);
860 // Non-instance-fields can't have a bitfield.
862 if (Member->isInvalidDecl()) {
863 // don't emit another diagnostic.
864 } else if (isa<VarDecl>(Member)) {
865 // C++ 9.6p3: A bit-field shall not be a static member.
866 // "static member 'A' cannot be a bit-field"
867 Diag(Loc, diag::err_static_not_bitfield)
868 << Name << BitWidth->getSourceRange();
869 } else if (isa<TypedefDecl>(Member)) {
870 // "typedef member 'x' cannot be a bit-field"
871 Diag(Loc, diag::err_typedef_not_bitfield)
872 << Name << BitWidth->getSourceRange();
874 // A function typedef ("typedef int f(); f a;").
875 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
876 Diag(Loc, diag::err_not_integral_type_bitfield)
877 << Name << cast<ValueDecl>(Member)->getType()
878 << BitWidth->getSourceRange();
881 DeleteExpr(BitWidth);
883 Member->setInvalidDecl();
886 Member->setAccess(AS);
888 // If we have declared a member function template, set the access of the
889 // templated declaration as well.
890 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member))
891 FunTmpl->getTemplatedDecl()->setAccess(AS);
894 assert((Name || isInstField) && "No identifier for non-field ?");
897 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false);
898 if (Deleted) // FIXME: Source location is not very good.
899 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin());
902 FieldCollector->Add(cast<FieldDecl>(Member));
905 return DeclPtrTy::make(Member);
908 /// ActOnMemInitializer - Handle a C++ member initializer.
910 Sema::ActOnMemInitializer(DeclPtrTy ConstructorD,
912 const CXXScopeSpec &SS,
913 IdentifierInfo *MemberOrBase,
914 TypeTy *TemplateTypeTy,
915 SourceLocation IdLoc,
916 SourceLocation LParenLoc,
917 ExprTy **Args, unsigned NumArgs,
918 SourceLocation *CommaLocs,
919 SourceLocation RParenLoc) {
923 AdjustDeclIfTemplate(ConstructorD);
925 CXXConstructorDecl *Constructor
926 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>());
928 // The user wrote a constructor initializer on a function that is
929 // not a C++ constructor. Ignore the error for now, because we may
930 // have more member initializers coming; we'll diagnose it just
931 // once in ActOnMemInitializers.
935 CXXRecordDecl *ClassDecl = Constructor->getParent();
937 // C++ [class.base.init]p2:
938 // Names in a mem-initializer-id are looked up in the scope of the
939 // constructor’s class and, if not found in that scope, are looked
940 // up in the scope containing the constructor’s
941 // definition. [Note: if the constructor’s class contains a member
942 // with the same name as a direct or virtual base class of the
943 // class, a mem-initializer-id naming the member or base class and
944 // composed of a single identifier refers to the class member. A
945 // mem-initializer-id for the hidden base class may be specified
946 // using a qualified name. ]
947 if (!SS.getScopeRep() && !TemplateTypeTy) {
948 // Look for a member, first.
949 FieldDecl *Member = 0;
950 DeclContext::lookup_result Result
951 = ClassDecl->lookup(MemberOrBase);
952 if (Result.first != Result.second)
953 Member = dyn_cast<FieldDecl>(*Result.first);
955 // FIXME: Handle members of an anonymous union.
958 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc,
961 // It didn't name a member, so see if it names a class.
962 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy
963 : getTypeName(*MemberOrBase, IdLoc, S, &SS);
965 return Diag(IdLoc, diag::err_mem_init_not_member_or_class)
966 << MemberOrBase << SourceRange(IdLoc, RParenLoc);
968 QualType BaseType = GetTypeFromParser(BaseTy);
970 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc,
971 RParenLoc, ClassDecl);
975 Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args,
976 unsigned NumArgs, SourceLocation IdLoc,
977 SourceLocation RParenLoc) {
978 bool HasDependentArg = false;
979 for (unsigned i = 0; i < NumArgs; i++)
980 HasDependentArg |= Args[i]->isTypeDependent();
982 CXXConstructorDecl *C = 0;
983 QualType FieldType = Member->getType();
984 if (const ArrayType *Array = Context.getAsArrayType(FieldType))
985 FieldType = Array->getElementType();
986 if (FieldType->isDependentType()) {
987 // Can't check init for dependent type.
988 } else if (FieldType->getAs<RecordType>()) {
989 if (!HasDependentArg) {
990 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
992 C = PerformInitializationByConstructor(FieldType,
997 SourceRange(IdLoc, RParenLoc),
998 Member->getDeclName(), IK_Direct,
1002 // Take over the constructor arguments as our own.
1003 NumArgs = ConstructorArgs.size();
1004 Args = (Expr **)ConstructorArgs.take();
1007 } else if (NumArgs != 1 && NumArgs != 0) {
1008 return Diag(IdLoc, diag::err_mem_initializer_mismatch)
1009 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc);
1010 } else if (!HasDependentArg) {
1013 if (FieldType->isReferenceType()) {
1014 Diag(IdLoc, diag::err_null_intialized_reference_member)
1015 << Member->getDeclName();
1016 return Diag(Member->getLocation(), diag::note_declared_at);
1018 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc);
1022 NewExp = (Expr*)Args[0];
1023 if (PerformCopyInitialization(NewExp, FieldType, "passing"))
1027 // FIXME: Perform direct initialization of the member.
1028 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args,
1029 NumArgs, C, IdLoc, RParenLoc);
1033 Sema::BuildBaseInitializer(QualType BaseType, Expr **Args,
1034 unsigned NumArgs, SourceLocation IdLoc,
1035 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) {
1036 bool HasDependentArg = false;
1037 for (unsigned i = 0; i < NumArgs; i++)
1038 HasDependentArg |= Args[i]->isTypeDependent();
1040 if (!BaseType->isDependentType()) {
1041 if (!BaseType->isRecordType())
1042 return Diag(IdLoc, diag::err_base_init_does_not_name_class)
1043 << BaseType << SourceRange(IdLoc, RParenLoc);
1045 // C++ [class.base.init]p2:
1046 // [...] Unless the mem-initializer-id names a nonstatic data
1047 // member of the constructor’s class or a direct or virtual base
1048 // of that class, the mem-initializer is ill-formed. A
1049 // mem-initializer-list can initialize a base class using any
1050 // name that denotes that base class type.
1052 // First, check for a direct base class.
1053 const CXXBaseSpecifier *DirectBaseSpec = 0;
1054 for (CXXRecordDecl::base_class_const_iterator Base =
1055 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) {
1056 if (Context.getCanonicalType(BaseType).getUnqualifiedType() ==
1057 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) {
1058 // We found a direct base of this type. That's what we're
1060 DirectBaseSpec = &*Base;
1065 // Check for a virtual base class.
1066 // FIXME: We might be able to short-circuit this if we know in advance that
1067 // there are no virtual bases.
1068 const CXXBaseSpecifier *VirtualBaseSpec = 0;
1069 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) {
1070 // We haven't found a base yet; search the class hierarchy for a
1071 // virtual base class.
1072 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1073 /*DetectVirtual=*/false);
1074 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) {
1075 for (CXXBasePaths::paths_iterator Path = Paths.begin();
1076 Path != Paths.end(); ++Path) {
1077 if (Path->back().Base->isVirtual()) {
1078 VirtualBaseSpec = Path->back().Base;
1085 // C++ [base.class.init]p2:
1086 // If a mem-initializer-id is ambiguous because it designates both
1087 // a direct non-virtual base class and an inherited virtual base
1088 // class, the mem-initializer is ill-formed.
1089 if (DirectBaseSpec && VirtualBaseSpec)
1090 return Diag(IdLoc, diag::err_base_init_direct_and_virtual)
1091 << BaseType << SourceRange(IdLoc, RParenLoc);
1092 // C++ [base.class.init]p2:
1093 // Unless the mem-initializer-id names a nonstatic data membeer of the
1094 // constructor's class ot a direst or virtual base of that class, the
1095 // mem-initializer is ill-formed.
1096 if (!DirectBaseSpec && !VirtualBaseSpec)
1097 return Diag(IdLoc, diag::err_not_direct_base_or_virtual)
1098 << BaseType << ClassDecl->getNameAsCString()
1099 << SourceRange(IdLoc, RParenLoc);
1102 CXXConstructorDecl *C = 0;
1103 if (!BaseType->isDependentType() && !HasDependentArg) {
1104 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName(
1105 Context.getCanonicalType(BaseType));
1106 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
1108 C = PerformInitializationByConstructor(BaseType,
1110 (void**)Args, NumArgs),
1111 IdLoc, SourceRange(IdLoc, RParenLoc),
1115 // Take over the constructor arguments as our own.
1116 NumArgs = ConstructorArgs.size();
1117 Args = (Expr **)ConstructorArgs.take();
1121 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args,
1122 NumArgs, C, IdLoc, RParenLoc);
1126 Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor,
1127 CXXBaseOrMemberInitializer **Initializers,
1128 unsigned NumInitializers,
1129 llvm::SmallVectorImpl<CXXBaseSpecifier *>& Bases,
1130 llvm::SmallVectorImpl<FieldDecl *>&Fields) {
1131 // We need to build the initializer AST according to order of construction
1132 // and not what user specified in the Initializers list.
1133 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext());
1134 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit;
1135 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields;
1136 bool HasDependentBaseInit = false;
1138 for (unsigned i = 0; i < NumInitializers; i++) {
1139 CXXBaseOrMemberInitializer *Member = Initializers[i];
1140 if (Member->isBaseInitializer()) {
1141 if (Member->getBaseClass()->isDependentType())
1142 HasDependentBaseInit = true;
1143 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member;
1145 AllBaseFields[Member->getMember()] = Member;
1149 if (HasDependentBaseInit) {
1150 // FIXME. This does not preserve the ordering of the initializers.
1151 // Try (with -Wreorder)
1152 // template<class X> struct A {};
1153 // template<class X> struct B : A<X> {
1154 // B() : x1(10), A<X>() {}
1158 // On seeing one dependent type, we should essentially exit this routine
1159 // while preserving user-declared initializer list. When this routine is
1160 // called during instantiatiation process, this routine will rebuild the
1161 // oderdered initializer list correctly.
1163 // If we have a dependent base initialization, we can't determine the
1164 // association between initializers and bases; just dump the known
1165 // initializers into the list, and don't try to deal with other bases.
1166 for (unsigned i = 0; i < NumInitializers; i++) {
1167 CXXBaseOrMemberInitializer *Member = Initializers[i];
1168 if (Member->isBaseInitializer())
1169 AllToInit.push_back(Member);
1172 // Push virtual bases before others.
1173 for (CXXRecordDecl::base_class_iterator VBase =
1174 ClassDecl->vbases_begin(),
1175 E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
1176 if (VBase->getType()->isDependentType())
1178 if (CXXBaseOrMemberInitializer *Value =
1179 AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) {
1180 CXXRecordDecl *BaseDecl =
1181 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl());
1182 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null");
1183 if (CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context))
1184 MarkDeclarationReferenced(Value->getSourceLocation(), Ctor);
1185 AllToInit.push_back(Value);
1188 CXXRecordDecl *VBaseDecl =
1189 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl());
1190 assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null");
1191 CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context);
1193 Bases.push_back(VBase);
1197 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this);
1198 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0),
1199 Constructor->getLocation(), CtorArgs))
1202 MarkDeclarationReferenced(Constructor->getLocation(), Ctor);
1204 CXXBaseOrMemberInitializer *Member =
1205 new (Context) CXXBaseOrMemberInitializer(VBase->getType(),
1206 CtorArgs.takeAs<Expr>(),
1207 CtorArgs.size(), Ctor,
1210 AllToInit.push_back(Member);
1214 for (CXXRecordDecl::base_class_iterator Base =
1215 ClassDecl->bases_begin(),
1216 E = ClassDecl->bases_end(); Base != E; ++Base) {
1217 // Virtuals are in the virtual base list and already constructed.
1218 if (Base->isVirtual())
1220 // Skip dependent types.
1221 if (Base->getType()->isDependentType())
1223 if (CXXBaseOrMemberInitializer *Value =
1224 AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) {
1225 CXXRecordDecl *BaseDecl =
1226 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
1227 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null");
1228 if (CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context))
1229 MarkDeclarationReferenced(Value->getSourceLocation(), Ctor);
1230 AllToInit.push_back(Value);
1233 CXXRecordDecl *BaseDecl =
1234 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
1235 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null");
1236 CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context);
1238 Bases.push_back(Base);
1242 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this);
1243 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0),
1244 Constructor->getLocation(), CtorArgs))
1247 MarkDeclarationReferenced(Constructor->getLocation(), Ctor);
1249 CXXBaseOrMemberInitializer *Member =
1250 new (Context) CXXBaseOrMemberInitializer(Base->getType(),
1251 CtorArgs.takeAs<Expr>(),
1252 CtorArgs.size(), Ctor,
1255 AllToInit.push_back(Member);
1260 // non-static data members.
1261 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
1262 E = ClassDecl->field_end(); Field != E; ++Field) {
1263 if ((*Field)->isAnonymousStructOrUnion()) {
1264 if (const RecordType *FieldClassType =
1265 Field->getType()->getAs<RecordType>()) {
1266 CXXRecordDecl *FieldClassDecl
1267 = cast<CXXRecordDecl>(FieldClassType->getDecl());
1268 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(),
1269 EA = FieldClassDecl->field_end(); FA != EA; FA++) {
1270 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) {
1271 // 'Member' is the anonymous union field and 'AnonUnionMember' is
1272 // set to the anonymous union data member used in the initializer
1274 Value->setMember(*Field);
1275 Value->setAnonUnionMember(*FA);
1276 AllToInit.push_back(Value);
1283 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) {
1284 QualType FT = (*Field)->getType();
1285 if (const RecordType* RT = FT->getAs<RecordType>()) {
1286 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RT->getDecl());
1287 assert(FieldRecDecl && "SetBaseOrMemberInitializers - BaseDecl null");
1288 if (CXXConstructorDecl *Ctor =
1289 FieldRecDecl->getDefaultConstructor(Context))
1290 MarkDeclarationReferenced(Value->getSourceLocation(), Ctor);
1292 AllToInit.push_back(Value);
1296 QualType FT = Context.getBaseElementType((*Field)->getType());
1297 if (const RecordType* RT = FT->getAs<RecordType>()) {
1298 CXXConstructorDecl *Ctor =
1299 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context);
1300 if (!Ctor && !FT->isDependentType()) {
1301 Fields.push_back(*Field);
1305 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this);
1306 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0),
1307 Constructor->getLocation(), CtorArgs))
1310 CXXBaseOrMemberInitializer *Member =
1311 new (Context) CXXBaseOrMemberInitializer(*Field,CtorArgs.takeAs<Expr>(),
1312 CtorArgs.size(), Ctor,
1316 AllToInit.push_back(Member);
1318 MarkDeclarationReferenced(Constructor->getLocation(), Ctor);
1319 if (FT.isConstQualified() && (!Ctor || Ctor->isTrivial())) {
1320 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor)
1321 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getDeclName();
1322 Diag((*Field)->getLocation(), diag::note_declared_at);
1325 else if (FT->isReferenceType()) {
1326 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor)
1327 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getDeclName();
1328 Diag((*Field)->getLocation(), diag::note_declared_at);
1330 else if (FT.isConstQualified()) {
1331 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor)
1332 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getDeclName();
1333 Diag((*Field)->getLocation(), diag::note_declared_at);
1337 NumInitializers = AllToInit.size();
1338 if (NumInitializers > 0) {
1339 Constructor->setNumBaseOrMemberInitializers(NumInitializers);
1340 CXXBaseOrMemberInitializer **baseOrMemberInitializers =
1341 new (Context) CXXBaseOrMemberInitializer*[NumInitializers];
1343 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers);
1344 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx)
1345 baseOrMemberInitializers[Idx] = AllToInit[Idx];
1350 Sema::BuildBaseOrMemberInitializers(ASTContext &C,
1351 CXXConstructorDecl *Constructor,
1352 CXXBaseOrMemberInitializer **Initializers,
1353 unsigned NumInitializers
1355 llvm::SmallVector<CXXBaseSpecifier *, 4> Bases;
1356 llvm::SmallVector<FieldDecl *, 4> Members;
1358 SetBaseOrMemberInitializers(Constructor,
1359 Initializers, NumInitializers, Bases, Members);
1360 for (unsigned int i = 0; i < Bases.size(); i++)
1361 Diag(Bases[i]->getSourceRange().getBegin(),
1362 diag::err_missing_default_constructor) << 0 << Bases[i]->getType();
1363 for (unsigned int i = 0; i < Members.size(); i++)
1364 Diag(Members[i]->getLocation(), diag::err_missing_default_constructor)
1365 << 1 << Members[i]->getType();
1368 static void *GetKeyForTopLevelField(FieldDecl *Field) {
1369 // For anonymous unions, use the class declaration as the key.
1370 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) {
1371 if (RT->getDecl()->isAnonymousStructOrUnion())
1372 return static_cast<void *>(RT->getDecl());
1374 return static_cast<void *>(Field);
1377 static void *GetKeyForBase(QualType BaseType) {
1378 if (const RecordType *RT = BaseType->getAs<RecordType>())
1381 assert(0 && "Unexpected base type!");
1385 static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member,
1386 bool MemberMaybeAnon = false) {
1387 // For fields injected into the class via declaration of an anonymous union,
1388 // use its anonymous union class declaration as the unique key.
1389 if (Member->isMemberInitializer()) {
1390 FieldDecl *Field = Member->getMember();
1392 // After BuildBaseOrMemberInitializers call, Field is the anonymous union
1393 // data member of the class. Data member used in the initializer list is
1394 // in AnonUnionMember field.
1395 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion())
1396 Field = Member->getAnonUnionMember();
1397 if (Field->getDeclContext()->isRecord()) {
1398 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext());
1399 if (RD->isAnonymousStructOrUnion())
1400 return static_cast<void *>(RD);
1402 return static_cast<void *>(Field);
1405 return GetKeyForBase(QualType(Member->getBaseClass(), 0));
1408 void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl,
1409 SourceLocation ColonLoc,
1410 MemInitTy **MemInits, unsigned NumMemInits) {
1411 if (!ConstructorDecl)
1414 AdjustDeclIfTemplate(ConstructorDecl);
1416 CXXConstructorDecl *Constructor
1417 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>());
1420 Diag(ColonLoc, diag::err_only_constructors_take_base_inits);
1424 if (!Constructor->isDependentContext()) {
1425 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members;
1427 for (unsigned i = 0; i < NumMemInits; i++) {
1428 CXXBaseOrMemberInitializer *Member =
1429 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]);
1430 void *KeyToMember = GetKeyForMember(Member);
1431 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember];
1433 PrevMember = Member;
1436 if (FieldDecl *Field = Member->getMember())
1437 Diag(Member->getSourceLocation(),
1438 diag::error_multiple_mem_initialization)
1439 << Field->getNameAsString();
1441 Type *BaseClass = Member->getBaseClass();
1442 assert(BaseClass && "ActOnMemInitializers - neither field or base");
1443 Diag(Member->getSourceLocation(),
1444 diag::error_multiple_base_initialization)
1445 << QualType(BaseClass, 0);
1447 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer)
1456 BuildBaseOrMemberInitializers(Context, Constructor,
1457 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits),
1460 if (Constructor->isDependentContext())
1463 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) ==
1464 Diagnostic::Ignored &&
1465 Diags.getDiagnosticLevel(diag::warn_field_initialized) ==
1466 Diagnostic::Ignored)
1469 // Also issue warning if order of ctor-initializer list does not match order
1470 // of 1) base class declarations and 2) order of non-static data members.
1471 llvm::SmallVector<const void*, 32> AllBaseOrMembers;
1473 CXXRecordDecl *ClassDecl
1474 = cast<CXXRecordDecl>(Constructor->getDeclContext());
1475 // Push virtual bases before others.
1476 for (CXXRecordDecl::base_class_iterator VBase =
1477 ClassDecl->vbases_begin(),
1478 E = ClassDecl->vbases_end(); VBase != E; ++VBase)
1479 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType()));
1481 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
1482 E = ClassDecl->bases_end(); Base != E; ++Base) {
1483 // Virtuals are alread in the virtual base list and are constructed
1485 if (Base->isVirtual())
1487 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType()));
1490 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
1491 E = ClassDecl->field_end(); Field != E; ++Field)
1492 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field));
1494 int Last = AllBaseOrMembers.size();
1496 CXXBaseOrMemberInitializer *PrevMember = 0;
1497 for (unsigned i = 0; i < NumMemInits; i++) {
1498 CXXBaseOrMemberInitializer *Member =
1499 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]);
1500 void *MemberInCtorList = GetKeyForMember(Member, true);
1502 for (; curIndex < Last; curIndex++)
1503 if (MemberInCtorList == AllBaseOrMembers[curIndex])
1505 if (curIndex == Last) {
1506 assert(PrevMember && "Member not in member list?!");
1507 // Initializer as specified in ctor-initializer list is out of order.
1508 // Issue a warning diagnostic.
1509 if (PrevMember->isBaseInitializer()) {
1510 // Diagnostics is for an initialized base class.
1511 Type *BaseClass = PrevMember->getBaseClass();
1512 Diag(PrevMember->getSourceLocation(),
1513 diag::warn_base_initialized)
1514 << QualType(BaseClass, 0);
1516 FieldDecl *Field = PrevMember->getMember();
1517 Diag(PrevMember->getSourceLocation(),
1518 diag::warn_field_initialized)
1519 << Field->getNameAsString();
1522 if (FieldDecl *Field = Member->getMember())
1523 Diag(Member->getSourceLocation(),
1524 diag::note_fieldorbase_initialized_here) << 0
1525 << Field->getNameAsString();
1527 Type *BaseClass = Member->getBaseClass();
1528 Diag(Member->getSourceLocation(),
1529 diag::note_fieldorbase_initialized_here) << 1
1530 << QualType(BaseClass, 0);
1532 for (curIndex = 0; curIndex < Last; curIndex++)
1533 if (MemberInCtorList == AllBaseOrMembers[curIndex])
1536 PrevMember = Member;
1541 Sema::computeBaseOrMembersToDestroy(CXXDestructorDecl *Destructor) {
1542 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Destructor->getDeclContext());
1543 llvm::SmallVector<uintptr_t, 32> AllToDestruct;
1545 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(),
1546 E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
1547 if (VBase->getType()->isDependentType())
1549 // Skip over virtual bases which have trivial destructors.
1550 CXXRecordDecl *BaseClassDecl
1551 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl());
1552 if (BaseClassDecl->hasTrivialDestructor())
1554 if (const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context))
1555 MarkDeclarationReferenced(Destructor->getLocation(),
1556 const_cast<CXXDestructorDecl*>(Dtor));
1559 reinterpret_cast<uintptr_t>(VBase->getType().getTypePtr())
1560 | CXXDestructorDecl::VBASE;
1561 AllToDestruct.push_back(Member);
1563 for (CXXRecordDecl::base_class_iterator Base =
1564 ClassDecl->bases_begin(),
1565 E = ClassDecl->bases_end(); Base != E; ++Base) {
1566 if (Base->isVirtual())
1568 if (Base->getType()->isDependentType())
1570 // Skip over virtual bases which have trivial destructors.
1571 CXXRecordDecl *BaseClassDecl
1572 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
1573 if (BaseClassDecl->hasTrivialDestructor())
1575 if (const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context))
1576 MarkDeclarationReferenced(Destructor->getLocation(),
1577 const_cast<CXXDestructorDecl*>(Dtor));
1579 reinterpret_cast<uintptr_t>(Base->getType().getTypePtr())
1580 | CXXDestructorDecl::DRCTNONVBASE;
1581 AllToDestruct.push_back(Member);
1584 // non-static data members.
1585 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
1586 E = ClassDecl->field_end(); Field != E; ++Field) {
1587 QualType FieldType = Context.getBaseElementType((*Field)->getType());
1589 if (const RecordType* RT = FieldType->getAs<RecordType>()) {
1590 // Skip over virtual bases which have trivial destructors.
1591 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
1592 if (FieldClassDecl->hasTrivialDestructor())
1594 if (const CXXDestructorDecl *Dtor =
1595 FieldClassDecl->getDestructor(Context))
1596 MarkDeclarationReferenced(Destructor->getLocation(),
1597 const_cast<CXXDestructorDecl*>(Dtor));
1598 uintptr_t Member = reinterpret_cast<uintptr_t>(*Field);
1599 AllToDestruct.push_back(Member);
1603 unsigned NumDestructions = AllToDestruct.size();
1604 if (NumDestructions > 0) {
1605 Destructor->setNumBaseOrMemberDestructions(NumDestructions);
1606 uintptr_t *BaseOrMemberDestructions =
1607 new (Context) uintptr_t [NumDestructions];
1608 // Insert in reverse order.
1609 for (int Idx = NumDestructions-1, i=0 ; Idx >= 0; --Idx)
1610 BaseOrMemberDestructions[i++] = AllToDestruct[Idx];
1611 Destructor->setBaseOrMemberDestructions(BaseOrMemberDestructions);
1615 void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) {
1619 AdjustDeclIfTemplate(CDtorDecl);
1621 if (CXXConstructorDecl *Constructor
1622 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>()))
1623 BuildBaseOrMemberInitializers(Context,
1625 (CXXBaseOrMemberInitializer **)0, 0);
1629 /// PureVirtualMethodCollector - traverses a class and its superclasses
1630 /// and determines if it has any pure virtual methods.
1631 class VISIBILITY_HIDDEN PureVirtualMethodCollector {
1632 ASTContext &Context;
1635 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList;
1640 void Collect(const CXXRecordDecl* RD, MethodList& Methods);
1643 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD)
1649 // Copy the temporary list to methods, and make sure to ignore any
1651 for (size_t i = 0, e = List.size(); i != e; ++i) {
1653 Methods.push_back(List[i]);
1657 bool empty() const { return Methods.empty(); }
1659 MethodList::const_iterator methods_begin() { return Methods.begin(); }
1660 MethodList::const_iterator methods_end() { return Methods.end(); }
1663 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD,
1664 MethodList& Methods) {
1665 // First, collect the pure virtual methods for the base classes.
1666 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(),
1667 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) {
1668 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) {
1669 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl());
1670 if (BaseDecl && BaseDecl->isAbstract())
1671 Collect(BaseDecl, Methods);
1675 // Next, zero out any pure virtual methods that this class overrides.
1676 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy;
1678 MethodSetTy OverriddenMethods;
1679 size_t MethodsSize = Methods.size();
1681 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end();
1683 // Traverse the record, looking for methods.
1684 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) {
1685 // If the method is pure virtual, add it to the methods vector.
1687 Methods.push_back(MD);
1689 // Record all the overridden methods in our set.
1690 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
1691 E = MD->end_overridden_methods(); I != E; ++I) {
1692 // Keep track of the overridden methods.
1693 OverriddenMethods.insert(*I);
1698 // Now go through the methods and zero out all the ones we know are
1700 for (size_t i = 0, e = MethodsSize; i != e; ++i) {
1701 if (OverriddenMethods.count(Methods[i]))
1709 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
1710 unsigned DiagID, AbstractDiagSelID SelID,
1711 const CXXRecordDecl *CurrentRD) {
1713 return RequireNonAbstractType(Loc, T,
1714 PDiag(DiagID), CurrentRD);
1716 return RequireNonAbstractType(Loc, T,
1717 PDiag(DiagID) << SelID, CurrentRD);
1720 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
1721 const PartialDiagnostic &PD,
1722 const CXXRecordDecl *CurrentRD) {
1723 if (!getLangOptions().CPlusPlus)
1726 if (const ArrayType *AT = Context.getAsArrayType(T))
1727 return RequireNonAbstractType(Loc, AT->getElementType(), PD,
1730 if (const PointerType *PT = T->getAs<PointerType>()) {
1731 // Find the innermost pointer type.
1732 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>())
1735 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType()))
1736 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD);
1739 const RecordType *RT = T->getAs<RecordType>();
1743 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl());
1747 if (CurrentRD && CurrentRD != RD)
1750 if (!RD->isAbstract())
1753 Diag(Loc, PD) << RD->getDeclName();
1755 // Check if we've already emitted the list of pure virtual functions for this
1757 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD))
1760 PureVirtualMethodCollector Collector(Context, RD);
1762 for (PureVirtualMethodCollector::MethodList::const_iterator I =
1763 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) {
1764 const CXXMethodDecl *MD = *I;
1766 Diag(MD->getLocation(), diag::note_pure_virtual_function) <<
1770 if (!PureVirtualClassDiagSet)
1771 PureVirtualClassDiagSet.reset(new RecordDeclSetTy);
1772 PureVirtualClassDiagSet->insert(RD);
1778 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser
1779 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> {
1781 CXXRecordDecl *AbstractClass;
1783 bool VisitDeclContext(const DeclContext *DC) {
1784 bool Invalid = false;
1786 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(),
1787 E = DC->decls_end(); I != E; ++I)
1788 Invalid |= Visit(*I);
1794 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac)
1795 : SemaRef(SemaRef), AbstractClass(ac) {
1796 Visit(SemaRef.Context.getTranslationUnitDecl());
1799 bool VisitFunctionDecl(const FunctionDecl *FD) {
1800 if (FD->isThisDeclarationADefinition()) {
1801 // No need to do the check if we're in a definition, because it requires
1802 // that the return/param types are complete.
1803 // because that requires
1804 return VisitDeclContext(FD);
1807 // Check the return type.
1808 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType();
1810 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy,
1811 diag::err_abstract_type_in_decl,
1812 Sema::AbstractReturnType,
1815 for (FunctionDecl::param_const_iterator I = FD->param_begin(),
1816 E = FD->param_end(); I != E; ++I) {
1817 const ParmVarDecl *VD = *I;
1819 SemaRef.RequireNonAbstractType(VD->getLocation(),
1820 VD->getOriginalType(),
1821 diag::err_abstract_type_in_decl,
1822 Sema::AbstractParamType,
1829 bool VisitDecl(const Decl* D) {
1830 if (const DeclContext *DC = dyn_cast<DeclContext>(D))
1831 return VisitDeclContext(DC);
1838 void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
1840 SourceLocation LBrac,
1841 SourceLocation RBrac) {
1845 AdjustDeclIfTemplate(TagDecl);
1846 ActOnFields(S, RLoc, TagDecl,
1847 (DeclPtrTy*)FieldCollector->getCurFields(),
1848 FieldCollector->getCurNumFields(), LBrac, RBrac, 0);
1850 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>());
1851 if (!RD->isAbstract()) {
1852 // Collect all the pure virtual methods and see if this is an abstract
1854 PureVirtualMethodCollector Collector(Context, RD);
1855 if (!Collector.empty())
1856 RD->setAbstract(true);
1859 if (RD->isAbstract())
1860 AbstractClassUsageDiagnoser(*this, RD);
1862 if (!RD->isDependentType() && !RD->isInvalidDecl())
1863 AddImplicitlyDeclaredMembersToClass(RD);
1866 /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
1867 /// special functions, such as the default constructor, copy
1868 /// constructor, or destructor, to the given C++ class (C++
1869 /// [special]p1). This routine can only be executed just before the
1870 /// definition of the class is complete.
1871 void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
1872 CanQualType ClassType
1873 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
1875 // FIXME: Implicit declarations have exception specifications, which are
1876 // the union of the specifications of the implicitly called functions.
1878 if (!ClassDecl->hasUserDeclaredConstructor()) {
1879 // C++ [class.ctor]p5:
1880 // A default constructor for a class X is a constructor of class X
1881 // that can be called without an argument. If there is no
1882 // user-declared constructor for class X, a default constructor is
1883 // implicitly declared. An implicitly-declared default constructor
1884 // is an inline public member of its class.
1885 DeclarationName Name
1886 = Context.DeclarationNames.getCXXConstructorName(ClassType);
1887 CXXConstructorDecl *DefaultCon =
1888 CXXConstructorDecl::Create(Context, ClassDecl,
1889 ClassDecl->getLocation(), Name,
1890 Context.getFunctionType(Context.VoidTy,
1893 /*isExplicit=*/false,
1895 /*isImplicitlyDeclared=*/true);
1896 DefaultCon->setAccess(AS_public);
1897 DefaultCon->setImplicit();
1898 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor());
1899 ClassDecl->addDecl(DefaultCon);
1902 if (!ClassDecl->hasUserDeclaredCopyConstructor()) {
1903 // C++ [class.copy]p4:
1904 // If the class definition does not explicitly declare a copy
1905 // constructor, one is declared implicitly.
1907 // C++ [class.copy]p5:
1908 // The implicitly-declared copy constructor for a class X will
1914 bool HasConstCopyConstructor = true;
1916 // -- each direct or virtual base class B of X has a copy
1917 // constructor whose first parameter is of type const B& or
1918 // const volatile B&, and
1919 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin();
1920 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) {
1921 const CXXRecordDecl *BaseClassDecl
1922 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
1923 HasConstCopyConstructor
1924 = BaseClassDecl->hasConstCopyConstructor(Context);
1927 // -- for all the nonstatic data members of X that are of a
1928 // class type M (or array thereof), each such class type
1929 // has a copy constructor whose first parameter is of type
1930 // const M& or const volatile M&.
1931 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin();
1932 HasConstCopyConstructor && Field != ClassDecl->field_end();
1934 QualType FieldType = (*Field)->getType();
1935 if (const ArrayType *Array = Context.getAsArrayType(FieldType))
1936 FieldType = Array->getElementType();
1937 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
1938 const CXXRecordDecl *FieldClassDecl
1939 = cast<CXXRecordDecl>(FieldClassType->getDecl());
1940 HasConstCopyConstructor
1941 = FieldClassDecl->hasConstCopyConstructor(Context);
1945 // Otherwise, the implicitly declared copy constructor will have
1949 QualType ArgType = ClassType;
1950 if (HasConstCopyConstructor)
1951 ArgType = ArgType.withConst();
1952 ArgType = Context.getLValueReferenceType(ArgType);
1954 // An implicitly-declared copy constructor is an inline public
1955 // member of its class.
1956 DeclarationName Name
1957 = Context.DeclarationNames.getCXXConstructorName(ClassType);
1958 CXXConstructorDecl *CopyConstructor
1959 = CXXConstructorDecl::Create(Context, ClassDecl,
1960 ClassDecl->getLocation(), Name,
1961 Context.getFunctionType(Context.VoidTy,
1965 /*isExplicit=*/false,
1967 /*isImplicitlyDeclared=*/true);
1968 CopyConstructor->setAccess(AS_public);
1969 CopyConstructor->setImplicit();
1970 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor());
1972 // Add the parameter to the constructor.
1973 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor,
1974 ClassDecl->getLocation(),
1975 /*IdentifierInfo=*/0,
1976 ArgType, /*DInfo=*/0,
1978 CopyConstructor->setParams(Context, &FromParam, 1);
1979 ClassDecl->addDecl(CopyConstructor);
1982 if (!ClassDecl->hasUserDeclaredCopyAssignment()) {
1983 // Note: The following rules are largely analoguous to the copy
1984 // constructor rules. Note that virtual bases are not taken into account
1985 // for determining the argument type of the operator. Note also that
1986 // operators taking an object instead of a reference are allowed.
1988 // C++ [class.copy]p10:
1989 // If the class definition does not explicitly declare a copy
1990 // assignment operator, one is declared implicitly.
1991 // The implicitly-defined copy assignment operator for a class X
1992 // will have the form
1994 // X& X::operator=(const X&)
1997 bool HasConstCopyAssignment = true;
1999 // -- each direct base class B of X has a copy assignment operator
2000 // whose parameter is of type const B&, const volatile B& or B,
2002 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin();
2003 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) {
2004 assert(!Base->getType()->isDependentType() &&
2005 "Cannot generate implicit members for class with dependent bases.");
2006 const CXXRecordDecl *BaseClassDecl
2007 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
2008 const CXXMethodDecl *MD = 0;
2009 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context,
2013 // -- for all the nonstatic data members of X that are of a class
2014 // type M (or array thereof), each such class type has a copy
2015 // assignment operator whose parameter is of type const M&,
2016 // const volatile M& or M.
2017 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin();
2018 HasConstCopyAssignment && Field != ClassDecl->field_end();
2020 QualType FieldType = (*Field)->getType();
2021 if (const ArrayType *Array = Context.getAsArrayType(FieldType))
2022 FieldType = Array->getElementType();
2023 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
2024 const CXXRecordDecl *FieldClassDecl
2025 = cast<CXXRecordDecl>(FieldClassType->getDecl());
2026 const CXXMethodDecl *MD = 0;
2027 HasConstCopyAssignment
2028 = FieldClassDecl->hasConstCopyAssignment(Context, MD);
2032 // Otherwise, the implicitly declared copy assignment operator will
2035 // X& X::operator=(X&)
2036 QualType ArgType = ClassType;
2037 QualType RetType = Context.getLValueReferenceType(ArgType);
2038 if (HasConstCopyAssignment)
2039 ArgType = ArgType.withConst();
2040 ArgType = Context.getLValueReferenceType(ArgType);
2042 // An implicitly-declared copy assignment operator is an inline public
2043 // member of its class.
2044 DeclarationName Name =
2045 Context.DeclarationNames.getCXXOperatorName(OO_Equal);
2046 CXXMethodDecl *CopyAssignment =
2047 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name,
2048 Context.getFunctionType(RetType, &ArgType, 1,
2050 /*DInfo=*/0, /*isStatic=*/false, /*isInline=*/true);
2051 CopyAssignment->setAccess(AS_public);
2052 CopyAssignment->setImplicit();
2053 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment());
2054 CopyAssignment->setCopyAssignment(true);
2056 // Add the parameter to the operator.
2057 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment,
2058 ClassDecl->getLocation(),
2059 /*IdentifierInfo=*/0,
2060 ArgType, /*DInfo=*/0,
2062 CopyAssignment->setParams(Context, &FromParam, 1);
2064 // Don't call addedAssignmentOperator. There is no way to distinguish an
2065 // implicit from an explicit assignment operator.
2066 ClassDecl->addDecl(CopyAssignment);
2069 if (!ClassDecl->hasUserDeclaredDestructor()) {
2070 // C++ [class.dtor]p2:
2071 // If a class has no user-declared destructor, a destructor is
2072 // declared implicitly. An implicitly-declared destructor is an
2073 // inline public member of its class.
2074 DeclarationName Name
2075 = Context.DeclarationNames.getCXXDestructorName(ClassType);
2076 CXXDestructorDecl *Destructor
2077 = CXXDestructorDecl::Create(Context, ClassDecl,
2078 ClassDecl->getLocation(), Name,
2079 Context.getFunctionType(Context.VoidTy,
2082 /*isImplicitlyDeclared=*/true);
2083 Destructor->setAccess(AS_public);
2084 Destructor->setImplicit();
2085 Destructor->setTrivial(ClassDecl->hasTrivialDestructor());
2086 ClassDecl->addDecl(Destructor);
2090 void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) {
2091 Decl *D = TemplateD.getAs<Decl>();
2095 TemplateParameterList *Params = 0;
2096 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D))
2097 Params = Template->getTemplateParameters();
2098 else if (ClassTemplatePartialSpecializationDecl *PartialSpec
2099 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
2100 Params = PartialSpec->getTemplateParameters();
2104 for (TemplateParameterList::iterator Param = Params->begin(),
2105 ParamEnd = Params->end();
2106 Param != ParamEnd; ++Param) {
2107 NamedDecl *Named = cast<NamedDecl>(*Param);
2108 if (Named->getDeclName()) {
2109 S->AddDecl(DeclPtrTy::make(Named));
2110 IdResolver.AddDecl(Named);
2115 /// ActOnStartDelayedCXXMethodDeclaration - We have completed
2116 /// parsing a top-level (non-nested) C++ class, and we are now
2117 /// parsing those parts of the given Method declaration that could
2118 /// not be parsed earlier (C++ [class.mem]p2), such as default
2119 /// arguments. This action should enter the scope of the given
2120 /// Method declaration as if we had just parsed the qualified method
2121 /// name. However, it should not bring the parameters into scope;
2122 /// that will be performed by ActOnDelayedCXXMethodParameter.
2123 void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) {
2127 AdjustDeclIfTemplate(MethodD);
2130 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>());
2132 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext()));
2134 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr()));
2135 ActOnCXXEnterDeclaratorScope(S, SS);
2138 /// ActOnDelayedCXXMethodParameter - We've already started a delayed
2139 /// C++ method declaration. We're (re-)introducing the given
2140 /// function parameter into scope for use in parsing later parts of
2141 /// the method declaration. For example, we could see an
2142 /// ActOnParamDefaultArgument event for this parameter.
2143 void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) {
2147 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>());
2149 // If this parameter has an unparsed default argument, clear it out
2150 // to make way for the parsed default argument.
2151 if (Param->hasUnparsedDefaultArg())
2152 Param->setDefaultArg(0);
2154 S->AddDecl(DeclPtrTy::make(Param));
2155 if (Param->getDeclName())
2156 IdResolver.AddDecl(Param);
2159 /// ActOnFinishDelayedCXXMethodDeclaration - We have finished
2160 /// processing the delayed method declaration for Method. The method
2161 /// declaration is now considered finished. There may be a separate
2162 /// ActOnStartOfFunctionDef action later (not necessarily
2163 /// immediately!) for this method, if it was also defined inside the
2165 void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) {
2169 AdjustDeclIfTemplate(MethodD);
2171 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>());
2174 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext()));
2176 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr()));
2177 ActOnCXXExitDeclaratorScope(S, SS);
2179 // Now that we have our default arguments, check the constructor
2180 // again. It could produce additional diagnostics or affect whether
2181 // the class has implicitly-declared destructors, among other
2183 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method))
2184 CheckConstructor(Constructor);
2186 // Check the default arguments, which we may have added.
2187 if (!Method->isInvalidDecl())
2188 CheckCXXDefaultArguments(Method);
2191 /// CheckConstructorDeclarator - Called by ActOnDeclarator to check
2192 /// the well-formedness of the constructor declarator @p D with type @p
2193 /// R. If there are any errors in the declarator, this routine will
2194 /// emit diagnostics and set the invalid bit to true. In any case, the type
2195 /// will be updated to reflect a well-formed type for the constructor and
2197 QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R,
2198 FunctionDecl::StorageClass &SC) {
2199 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
2201 // C++ [class.ctor]p3:
2202 // A constructor shall not be virtual (10.3) or static (9.4). A
2203 // constructor can be invoked for a const, volatile or const
2204 // volatile object. A constructor shall not be declared const,
2205 // volatile, or const volatile (9.3.2).
2207 if (!D.isInvalidType())
2208 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
2209 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc())
2210 << SourceRange(D.getIdentifierLoc());
2213 if (SC == FunctionDecl::Static) {
2214 if (!D.isInvalidType())
2215 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
2216 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
2217 << SourceRange(D.getIdentifierLoc());
2219 SC = FunctionDecl::None;
2222 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
2223 if (FTI.TypeQuals != 0) {
2224 if (FTI.TypeQuals & Qualifiers::Const)
2225 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
2226 << "const" << SourceRange(D.getIdentifierLoc());
2227 if (FTI.TypeQuals & Qualifiers::Volatile)
2228 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
2229 << "volatile" << SourceRange(D.getIdentifierLoc());
2230 if (FTI.TypeQuals & Qualifiers::Restrict)
2231 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
2232 << "restrict" << SourceRange(D.getIdentifierLoc());
2235 // Rebuild the function type "R" without any type qualifiers (in
2236 // case any of the errors above fired) and with "void" as the
2237 // return type, since constructors don't have return types. We
2238 // *always* have to do this, because GetTypeForDeclarator will
2239 // put in a result type of "int" when none was specified.
2240 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
2241 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(),
2242 Proto->getNumArgs(),
2243 Proto->isVariadic(), 0);
2246 /// CheckConstructor - Checks a fully-formed constructor for
2247 /// well-formedness, issuing any diagnostics required. Returns true if
2248 /// the constructor declarator is invalid.
2249 void Sema::CheckConstructor(CXXConstructorDecl *Constructor) {
2250 CXXRecordDecl *ClassDecl
2251 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext());
2253 return Constructor->setInvalidDecl();
2255 // C++ [class.copy]p3:
2256 // A declaration of a constructor for a class X is ill-formed if
2257 // its first parameter is of type (optionally cv-qualified) X and
2258 // either there are no other parameters or else all other
2259 // parameters have default arguments.
2260 if (!Constructor->isInvalidDecl() &&
2261 ((Constructor->getNumParams() == 1) ||
2262 (Constructor->getNumParams() > 1 &&
2263 Constructor->getParamDecl(1)->hasDefaultArg()))) {
2264 QualType ParamType = Constructor->getParamDecl(0)->getType();
2265 QualType ClassTy = Context.getTagDeclType(ClassDecl);
2266 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) {
2267 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation();
2268 Diag(ParamLoc, diag::err_constructor_byvalue_arg)
2269 << CodeModificationHint::CreateInsertion(ParamLoc, " const &");
2270 Constructor->setInvalidDecl();
2274 // Notify the class that we've added a constructor.
2275 ClassDecl->addedConstructor(Context, Constructor);
2279 FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) {
2280 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
2281 FTI.ArgInfo[0].Param &&
2282 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType());
2285 /// CheckDestructorDeclarator - Called by ActOnDeclarator to check
2286 /// the well-formednes of the destructor declarator @p D with type @p
2287 /// R. If there are any errors in the declarator, this routine will
2288 /// emit diagnostics and set the declarator to invalid. Even if this happens,
2289 /// will be updated to reflect a well-formed type for the destructor and
2291 QualType Sema::CheckDestructorDeclarator(Declarator &D,
2292 FunctionDecl::StorageClass& SC) {
2293 // C++ [class.dtor]p1:
2294 // [...] A typedef-name that names a class is a class-name
2295 // (7.1.3); however, a typedef-name that names a class shall not
2296 // be used as the identifier in the declarator for a destructor
2298 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName);
2299 if (isa<TypedefType>(DeclaratorType)) {
2300 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
2305 // C++ [class.dtor]p2:
2306 // A destructor is used to destroy objects of its class type. A
2307 // destructor takes no parameters, and no return type can be
2308 // specified for it (not even void). The address of a destructor
2309 // shall not be taken. A destructor shall not be static. A
2310 // destructor can be invoked for a const, volatile or const
2311 // volatile object. A destructor shall not be declared const,
2312 // volatile or const volatile (9.3.2).
2313 if (SC == FunctionDecl::Static) {
2314 if (!D.isInvalidType())
2315 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be)
2316 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
2317 << SourceRange(D.getIdentifierLoc());
2318 SC = FunctionDecl::None;
2321 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
2322 // Destructors don't have return types, but the parser will
2323 // happily parse something like:
2329 // The return type will be eliminated later.
2330 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type)
2331 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
2332 << SourceRange(D.getIdentifierLoc());
2335 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
2336 if (FTI.TypeQuals != 0 && !D.isInvalidType()) {
2337 if (FTI.TypeQuals & Qualifiers::Const)
2338 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
2339 << "const" << SourceRange(D.getIdentifierLoc());
2340 if (FTI.TypeQuals & Qualifiers::Volatile)
2341 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
2342 << "volatile" << SourceRange(D.getIdentifierLoc());
2343 if (FTI.TypeQuals & Qualifiers::Restrict)
2344 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
2345 << "restrict" << SourceRange(D.getIdentifierLoc());
2349 // Make sure we don't have any parameters.
2350 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) {
2351 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params);
2353 // Delete the parameters.
2358 // Make sure the destructor isn't variadic.
2359 if (FTI.isVariadic) {
2360 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic);
2364 // Rebuild the function type "R" without any type qualifiers or
2365 // parameters (in case any of the errors above fired) and with
2366 // "void" as the return type, since destructors don't have return
2367 // types. We *always* have to do this, because GetTypeForDeclarator
2368 // will put in a result type of "int" when none was specified.
2369 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0);
2372 /// CheckConversionDeclarator - Called by ActOnDeclarator to check the
2373 /// well-formednes of the conversion function declarator @p D with
2374 /// type @p R. If there are any errors in the declarator, this routine
2375 /// will emit diagnostics and return true. Otherwise, it will return
2376 /// false. Either way, the type @p R will be updated to reflect a
2377 /// well-formed type for the conversion operator.
2378 void Sema::CheckConversionDeclarator(Declarator &D, QualType &R,
2379 FunctionDecl::StorageClass& SC) {
2380 // C++ [class.conv.fct]p1:
2381 // Neither parameter types nor return type can be specified. The
2382 // type of a conversion function (8.3.5) is "function taking no
2383 // parameter returning conversion-type-id."
2384 if (SC == FunctionDecl::Static) {
2385 if (!D.isInvalidType())
2386 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member)
2387 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
2388 << SourceRange(D.getIdentifierLoc());
2390 SC = FunctionDecl::None;
2392 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
2393 // Conversion functions don't have return types, but the parser will
2394 // happily parse something like:
2397 // float operator bool();
2400 // The return type will be changed later anyway.
2401 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type)
2402 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
2403 << SourceRange(D.getIdentifierLoc());
2406 // Make sure we don't have any parameters.
2407 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) {
2408 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params);
2410 // Delete the parameters.
2411 D.getTypeObject(0).Fun.freeArgs();
2415 // Make sure the conversion function isn't variadic.
2416 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) {
2417 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic);
2421 // C++ [class.conv.fct]p4:
2422 // The conversion-type-id shall not represent a function type nor
2424 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId);
2425 if (ConvType->isArrayType()) {
2426 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array);
2427 ConvType = Context.getPointerType(ConvType);
2429 } else if (ConvType->isFunctionType()) {
2430 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function);
2431 ConvType = Context.getPointerType(ConvType);
2435 // Rebuild the function type "R" without any parameters (in case any
2436 // of the errors above fired) and with the conversion type as the
2438 R = Context.getFunctionType(ConvType, 0, 0, false,
2439 R->getAs<FunctionProtoType>()->getTypeQuals());
2441 // C++0x explicit conversion operators.
2442 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x)
2443 Diag(D.getDeclSpec().getExplicitSpecLoc(),
2444 diag::warn_explicit_conversion_functions)
2445 << SourceRange(D.getDeclSpec().getExplicitSpecLoc());
2448 /// ActOnConversionDeclarator - Called by ActOnDeclarator to complete
2449 /// the declaration of the given C++ conversion function. This routine
2450 /// is responsible for recording the conversion function in the C++
2451 /// class, if possible.
2452 Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) {
2453 assert(Conversion && "Expected to receive a conversion function declaration");
2455 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext());
2457 // Make sure we aren't redeclaring the conversion function.
2458 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType());
2460 // C++ [class.conv.fct]p1:
2461 // [...] A conversion function is never used to convert a
2462 // (possibly cv-qualified) object to the (possibly cv-qualified)
2463 // same object type (or a reference to it), to a (possibly
2464 // cv-qualified) base class of that type (or a reference to it),
2465 // or to (possibly cv-qualified) void.
2466 // FIXME: Suppress this warning if the conversion function ends up being a
2467 // virtual function that overrides a virtual function in a base class.
2469 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
2470 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>())
2471 ConvType = ConvTypeRef->getPointeeType();
2472 if (ConvType->isRecordType()) {
2473 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType();
2474 if (ConvType == ClassType)
2475 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used)
2477 else if (IsDerivedFrom(ClassType, ConvType))
2478 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used)
2479 << ClassType << ConvType;
2480 } else if (ConvType->isVoidType()) {
2481 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used)
2482 << ClassType << ConvType;
2485 if (Conversion->getPreviousDeclaration()) {
2486 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration();
2487 if (FunctionTemplateDecl *ConversionTemplate
2488 = Conversion->getDescribedFunctionTemplate())
2489 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration();
2490 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions();
2491 for (OverloadedFunctionDecl::function_iterator
2492 Conv = Conversions->function_begin(),
2493 ConvEnd = Conversions->function_end();
2494 Conv != ConvEnd; ++Conv) {
2495 if (*Conv == ExpectedPrevDecl) {
2497 return DeclPtrTy::make(Conversion);
2500 assert(Conversion->isInvalidDecl() && "Conversion should not get here.");
2501 } else if (FunctionTemplateDecl *ConversionTemplate
2502 = Conversion->getDescribedFunctionTemplate())
2503 ClassDecl->addConversionFunction(ConversionTemplate);
2504 else if (!Conversion->getPrimaryTemplate()) // ignore specializations
2505 ClassDecl->addConversionFunction(Conversion);
2507 return DeclPtrTy::make(Conversion);
2510 //===----------------------------------------------------------------------===//
2511 // Namespace Handling
2512 //===----------------------------------------------------------------------===//
2514 /// ActOnStartNamespaceDef - This is called at the start of a namespace
2516 Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope,
2517 SourceLocation IdentLoc,
2519 SourceLocation LBrace) {
2520 NamespaceDecl *Namespc =
2521 NamespaceDecl::Create(Context, CurContext, IdentLoc, II);
2522 Namespc->setLBracLoc(LBrace);
2524 Scope *DeclRegionScope = NamespcScope->getParent();
2527 // C++ [namespace.def]p2:
2528 // The identifier in an original-namespace-definition shall not have been
2529 // previously defined in the declarative region in which the
2530 // original-namespace-definition appears. The identifier in an
2531 // original-namespace-definition is the name of the namespace. Subsequently
2532 // in that declarative region, it is treated as an original-namespace-name.
2535 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, true);
2537 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) {
2538 // This is an extended namespace definition.
2539 // Attach this namespace decl to the chain of extended namespace
2541 OrigNS->setNextNamespace(Namespc);
2542 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace());
2544 // Remove the previous declaration from the scope.
2545 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) {
2546 IdResolver.RemoveDecl(OrigNS);
2547 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS));
2549 } else if (PrevDecl) {
2550 // This is an invalid name redefinition.
2551 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind)
2552 << Namespc->getDeclName();
2553 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
2554 Namespc->setInvalidDecl();
2555 // Continue on to push Namespc as current DeclContext and return it.
2556 } else if (II->isStr("std") &&
2557 CurContext->getLookupContext()->isTranslationUnit()) {
2558 // This is the first "real" definition of the namespace "std", so update
2559 // our cache of the "std" namespace to point at this definition.
2561 // We had already defined a dummy namespace "std". Link this new
2562 // namespace definition to the dummy namespace "std".
2563 StdNamespace->setNextNamespace(Namespc);
2564 StdNamespace->setLocation(IdentLoc);
2565 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace());
2568 // Make our StdNamespace cache point at the first real definition of the
2570 StdNamespace = Namespc;
2573 PushOnScopeChains(Namespc, DeclRegionScope);
2575 // Anonymous namespaces.
2577 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition
2578 // behaves as if it were replaced by
2579 // namespace unique { /* empty body */ }
2580 // using namespace unique;
2581 // namespace unique { namespace-body }
2582 // where all occurrences of 'unique' in a translation unit are
2583 // replaced by the same identifier and this identifier differs
2584 // from all other identifiers in the entire program.
2586 // We just create the namespace with an empty name and then add an
2587 // implicit using declaration, just like the standard suggests.
2589 // CodeGen enforces the "universally unique" aspect by giving all
2590 // declarations semantically contained within an anonymous
2591 // namespace internal linkage.
2593 assert(Namespc->isAnonymousNamespace());
2594 CurContext->addDecl(Namespc);
2596 UsingDirectiveDecl* UD
2597 = UsingDirectiveDecl::Create(Context, CurContext,
2598 /* 'using' */ LBrace,
2599 /* 'namespace' */ SourceLocation(),
2600 /* qualifier */ SourceRange(),
2602 /* identifier */ SourceLocation(),
2604 /* Ancestor */ CurContext);
2606 CurContext->addDecl(UD);
2609 // Although we could have an invalid decl (i.e. the namespace name is a
2610 // redefinition), push it as current DeclContext and try to continue parsing.
2611 // FIXME: We should be able to push Namespc here, so that the each DeclContext
2612 // for the namespace has the declarations that showed up in that particular
2613 // namespace definition.
2614 PushDeclContext(NamespcScope, Namespc);
2615 return DeclPtrTy::make(Namespc);
2618 /// ActOnFinishNamespaceDef - This callback is called after a namespace is
2619 /// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef.
2620 void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) {
2621 Decl *Dcl = D.getAs<Decl>();
2622 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl);
2623 assert(Namespc && "Invalid parameter, expected NamespaceDecl");
2624 Namespc->setRBracLoc(RBrace);
2628 Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S,
2629 SourceLocation UsingLoc,
2630 SourceLocation NamespcLoc,
2631 const CXXScopeSpec &SS,
2632 SourceLocation IdentLoc,
2633 IdentifierInfo *NamespcName,
2634 AttributeList *AttrList) {
2635 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
2636 assert(NamespcName && "Invalid NamespcName.");
2637 assert(IdentLoc.isValid() && "Invalid NamespceName location.");
2638 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
2640 UsingDirectiveDecl *UDir = 0;
2642 // Lookup namespace name.
2644 LookupParsedName(R, S, &SS, NamespcName, LookupNamespaceName, false);
2645 if (R.isAmbiguous()) {
2646 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc);
2650 NamedDecl *NS = R.getFoundDecl();
2651 assert(isa<NamespaceDecl>(NS) && "expected namespace decl");
2652 // C++ [namespace.udir]p1:
2653 // A using-directive specifies that the names in the nominated
2654 // namespace can be used in the scope in which the
2655 // using-directive appears after the using-directive. During
2656 // unqualified name lookup (3.4.1), the names appear as if they
2657 // were declared in the nearest enclosing namespace which
2658 // contains both the using-directive and the nominated
2659 // namespace. [Note: in this context, "contains" means "contains
2660 // directly or indirectly". ]
2662 // Find enclosing context containing both using-directive and
2663 // nominated namespace.
2664 DeclContext *CommonAncestor = cast<DeclContext>(NS);
2665 while (CommonAncestor && !CommonAncestor->Encloses(CurContext))
2666 CommonAncestor = CommonAncestor->getParent();
2668 UDir = UsingDirectiveDecl::Create(Context,
2669 CurContext, UsingLoc,
2672 (NestedNameSpecifier *)SS.getScopeRep(),
2674 cast<NamespaceDecl>(NS),
2676 PushUsingDirective(S, UDir);
2678 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
2681 // FIXME: We ignore attributes for now.
2683 return DeclPtrTy::make(UDir);
2686 void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) {
2687 // If scope has associated entity, then using directive is at namespace
2688 // or translation unit scope. We add UsingDirectiveDecls, into
2689 // it's lookup structure.
2690 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()))
2693 // Otherwise it is block-sope. using-directives will affect lookup
2694 // only to the end of scope.
2695 S->PushUsingDirective(DeclPtrTy::make(UDir));
2699 Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S,
2701 SourceLocation UsingLoc,
2702 const CXXScopeSpec &SS,
2703 SourceLocation IdentLoc,
2704 IdentifierInfo *TargetName,
2705 OverloadedOperatorKind Op,
2706 AttributeList *AttrList,
2708 assert((TargetName || Op) && "Invalid TargetName.");
2709 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
2711 DeclarationName Name;
2715 Name = Context.DeclarationNames.getCXXOperatorName(Op);
2717 NamedDecl *UD = BuildUsingDeclaration(UsingLoc, SS, IdentLoc,
2718 Name, AttrList, IsTypeName);
2720 PushOnScopeChains(UD, S);
2724 return DeclPtrTy::make(UD);
2727 NamedDecl *Sema::BuildUsingDeclaration(SourceLocation UsingLoc,
2728 const CXXScopeSpec &SS,
2729 SourceLocation IdentLoc,
2730 DeclarationName Name,
2731 AttributeList *AttrList,
2733 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
2734 assert(IdentLoc.isValid() && "Invalid TargetName location.");
2736 // FIXME: We ignore attributes for now.
2740 Diag(IdentLoc, diag::err_using_requires_qualname);
2744 NestedNameSpecifier *NNS =
2745 static_cast<NestedNameSpecifier *>(SS.getScopeRep());
2747 if (isUnknownSpecialization(SS)) {
2748 return UnresolvedUsingDecl::Create(Context, CurContext, UsingLoc,
2750 IdentLoc, Name, IsTypeName);
2753 DeclContext *LookupContext = 0;
2755 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) {
2756 // C++0x N2914 [namespace.udecl]p3:
2757 // A using-declaration used as a member-declaration shall refer to a member
2758 // of a base class of the class being defined, shall refer to a member of an
2759 // anonymous union that is a member of a base class of the class being
2760 // defined, or shall refer to an enumerator for an enumeration type that is
2761 // a member of a base class of the class being defined.
2762 const Type *Ty = NNS->getAsType();
2763 if (!Ty || !IsDerivedFrom(Context.getTagDeclType(RD), QualType(Ty, 0))) {
2764 Diag(SS.getRange().getBegin(),
2765 diag::err_using_decl_nested_name_specifier_is_not_a_base_class)
2766 << NNS << RD->getDeclName();
2770 QualType BaseTy = Context.getCanonicalType(QualType(Ty, 0));
2771 LookupContext = BaseTy->getAs<RecordType>()->getDecl();
2773 // C++0x N2914 [namespace.udecl]p8:
2774 // A using-declaration for a class member shall be a member-declaration.
2775 if (NNS->getKind() == NestedNameSpecifier::TypeSpec) {
2776 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_class_member)
2781 // C++0x N2914 [namespace.udecl]p9:
2782 // In a using-declaration, a prefix :: refers to the global namespace.
2783 if (NNS->getKind() == NestedNameSpecifier::Global)
2784 LookupContext = Context.getTranslationUnitDecl();
2786 LookupContext = NNS->getAsNamespace();
2790 // Lookup target name.
2792 LookupQualifiedName(R, LookupContext, Name, LookupOrdinaryName);
2795 Diag(IdentLoc, diag::err_no_member)
2796 << Name << LookupContext << SS.getRange();
2800 // FIXME: handle ambiguity?
2801 NamedDecl *ND = R.getAsSingleDecl(Context);
2803 if (IsTypeName && !isa<TypeDecl>(ND)) {
2804 Diag(IdentLoc, diag::err_using_typename_non_type);
2808 // C++0x N2914 [namespace.udecl]p6:
2809 // A using-declaration shall not name a namespace.
2810 if (isa<NamespaceDecl>(ND)) {
2811 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace)
2816 return UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(),
2817 ND->getLocation(), UsingLoc, ND, NNS, IsTypeName);
2820 /// getNamespaceDecl - Returns the namespace a decl represents. If the decl
2821 /// is a namespace alias, returns the namespace it points to.
2822 static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) {
2823 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D))
2824 return AD->getNamespace();
2825 return dyn_cast_or_null<NamespaceDecl>(D);
2828 Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S,
2829 SourceLocation NamespaceLoc,
2830 SourceLocation AliasLoc,
2831 IdentifierInfo *Alias,
2832 const CXXScopeSpec &SS,
2833 SourceLocation IdentLoc,
2834 IdentifierInfo *Ident) {
2836 // Lookup the namespace name.
2838 LookupParsedName(R, S, &SS, Ident, LookupNamespaceName, false);
2840 // Check if we have a previous declaration with the same name.
2841 if (NamedDecl *PrevDecl
2842 = LookupSingleName(S, Alias, LookupOrdinaryName, true)) {
2843 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) {
2844 // We already have an alias with the same name that points to the same
2845 // namespace, so don't create a new one.
2846 if (!R.isAmbiguous() && !R.empty() &&
2847 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl()))
2851 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition :
2852 diag::err_redefinition_different_kind;
2853 Diag(AliasLoc, DiagID) << Alias;
2854 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
2858 if (R.isAmbiguous()) {
2859 DiagnoseAmbiguousLookup(R, Ident, IdentLoc);
2864 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange();
2868 NamespaceAliasDecl *AliasDecl =
2869 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc,
2870 Alias, SS.getRange(),
2871 (NestedNameSpecifier *)SS.getScopeRep(),
2872 IdentLoc, R.getFoundDecl());
2874 CurContext->addDecl(AliasDecl);
2875 return DeclPtrTy::make(AliasDecl);
2878 void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
2879 CXXConstructorDecl *Constructor) {
2880 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() &&
2881 !Constructor->isUsed()) &&
2882 "DefineImplicitDefaultConstructor - call it for implicit default ctor");
2884 CXXRecordDecl *ClassDecl
2885 = cast<CXXRecordDecl>(Constructor->getDeclContext());
2886 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor");
2887 // Before the implicitly-declared default constructor for a class is
2888 // implicitly defined, all the implicitly-declared default constructors
2889 // for its base class and its non-static data members shall have been
2890 // implicitly defined.
2892 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
2893 E = ClassDecl->bases_end(); Base != E; ++Base) {
2894 CXXRecordDecl *BaseClassDecl
2895 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
2896 if (!BaseClassDecl->hasTrivialConstructor()) {
2897 if (CXXConstructorDecl *BaseCtor =
2898 BaseClassDecl->getDefaultConstructor(Context))
2899 MarkDeclarationReferenced(CurrentLocation, BaseCtor);
2901 Diag(CurrentLocation, diag::err_defining_default_ctor)
2902 << Context.getTagDeclType(ClassDecl) << 0
2903 << Context.getTagDeclType(BaseClassDecl);
2904 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl)
2905 << Context.getTagDeclType(BaseClassDecl);
2910 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
2911 E = ClassDecl->field_end(); Field != E; ++Field) {
2912 QualType FieldType = Context.getCanonicalType((*Field)->getType());
2913 if (const ArrayType *Array = Context.getAsArrayType(FieldType))
2914 FieldType = Array->getElementType();
2915 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
2916 CXXRecordDecl *FieldClassDecl
2917 = cast<CXXRecordDecl>(FieldClassType->getDecl());
2918 if (!FieldClassDecl->hasTrivialConstructor()) {
2919 if (CXXConstructorDecl *FieldCtor =
2920 FieldClassDecl->getDefaultConstructor(Context))
2921 MarkDeclarationReferenced(CurrentLocation, FieldCtor);
2923 Diag(CurrentLocation, diag::err_defining_default_ctor)
2924 << Context.getTagDeclType(ClassDecl) << 1 <<
2925 Context.getTagDeclType(FieldClassDecl);
2926 Diag((*Field)->getLocation(), diag::note_field_decl);
2927 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl)
2928 << Context.getTagDeclType(FieldClassDecl);
2932 } else if (FieldType->isReferenceType()) {
2933 Diag(CurrentLocation, diag::err_unintialized_member)
2934 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
2935 Diag((*Field)->getLocation(), diag::note_declared_at);
2937 } else if (FieldType.isConstQualified()) {
2938 Diag(CurrentLocation, diag::err_unintialized_member)
2939 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
2940 Diag((*Field)->getLocation(), diag::note_declared_at);
2945 Constructor->setUsed();
2947 Constructor->setInvalidDecl();
2950 void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation,
2951 CXXDestructorDecl *Destructor) {
2952 assert((Destructor->isImplicit() && !Destructor->isUsed()) &&
2953 "DefineImplicitDestructor - call it for implicit default dtor");
2955 CXXRecordDecl *ClassDecl
2956 = cast<CXXRecordDecl>(Destructor->getDeclContext());
2957 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor");
2958 // C++ [class.dtor] p5
2959 // Before the implicitly-declared default destructor for a class is
2960 // implicitly defined, all the implicitly-declared default destructors
2961 // for its base class and its non-static data members shall have been
2962 // implicitly defined.
2963 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
2964 E = ClassDecl->bases_end(); Base != E; ++Base) {
2965 CXXRecordDecl *BaseClassDecl
2966 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
2967 if (!BaseClassDecl->hasTrivialDestructor()) {
2968 if (CXXDestructorDecl *BaseDtor =
2969 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context)))
2970 MarkDeclarationReferenced(CurrentLocation, BaseDtor);
2973 "DefineImplicitDestructor - missing dtor in a base class");
2977 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
2978 E = ClassDecl->field_end(); Field != E; ++Field) {
2979 QualType FieldType = Context.getCanonicalType((*Field)->getType());
2980 if (const ArrayType *Array = Context.getAsArrayType(FieldType))
2981 FieldType = Array->getElementType();
2982 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
2983 CXXRecordDecl *FieldClassDecl
2984 = cast<CXXRecordDecl>(FieldClassType->getDecl());
2985 if (!FieldClassDecl->hasTrivialDestructor()) {
2986 if (CXXDestructorDecl *FieldDtor =
2987 const_cast<CXXDestructorDecl*>(
2988 FieldClassDecl->getDestructor(Context)))
2989 MarkDeclarationReferenced(CurrentLocation, FieldDtor);
2992 "DefineImplicitDestructor - missing dtor in class of a data member");
2996 Destructor->setUsed();
2999 void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation,
3000 CXXMethodDecl *MethodDecl) {
3001 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() &&
3002 MethodDecl->getOverloadedOperator() == OO_Equal &&
3003 !MethodDecl->isUsed()) &&
3004 "DefineImplicitOverloadedAssign - call it for implicit assignment op");
3006 CXXRecordDecl *ClassDecl
3007 = cast<CXXRecordDecl>(MethodDecl->getDeclContext());
3009 // C++[class.copy] p12
3010 // Before the implicitly-declared copy assignment operator for a class is
3011 // implicitly defined, all implicitly-declared copy assignment operators
3012 // for its direct base classes and its nonstatic data members shall have
3013 // been implicitly defined.
3015 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
3016 E = ClassDecl->bases_end(); Base != E; ++Base) {
3017 CXXRecordDecl *BaseClassDecl
3018 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
3019 if (CXXMethodDecl *BaseAssignOpMethod =
3020 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl))
3021 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod);
3023 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
3024 E = ClassDecl->field_end(); Field != E; ++Field) {
3025 QualType FieldType = Context.getCanonicalType((*Field)->getType());
3026 if (const ArrayType *Array = Context.getAsArrayType(FieldType))
3027 FieldType = Array->getElementType();
3028 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
3029 CXXRecordDecl *FieldClassDecl
3030 = cast<CXXRecordDecl>(FieldClassType->getDecl());
3031 if (CXXMethodDecl *FieldAssignOpMethod =
3032 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl))
3033 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod);
3034 } else if (FieldType->isReferenceType()) {
3035 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
3036 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
3037 Diag(Field->getLocation(), diag::note_declared_at);
3038 Diag(CurrentLocation, diag::note_first_required_here);
3040 } else if (FieldType.isConstQualified()) {
3041 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
3042 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
3043 Diag(Field->getLocation(), diag::note_declared_at);
3044 Diag(CurrentLocation, diag::note_first_required_here);
3049 MethodDecl->setUsed();
3053 Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl,
3054 CXXRecordDecl *ClassDecl) {
3055 QualType LHSType = Context.getTypeDeclType(ClassDecl);
3056 QualType RHSType(LHSType);
3057 // If class's assignment operator argument is const/volatile qualified,
3058 // look for operator = (const/volatile B&). Otherwise, look for
3060 RHSType = Context.getCVRQualifiedType(RHSType,
3061 ParmDecl->getType().getCVRQualifiers());
3062 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl,
3065 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl,
3068 Expr *Args[2] = { &*LHS, &*RHS };
3069 OverloadCandidateSet CandidateSet;
3070 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2,
3072 OverloadCandidateSet::iterator Best;
3073 if (BestViableFunction(CandidateSet,
3074 ClassDecl->getLocation(), Best) == OR_Success)
3075 return cast<CXXMethodDecl>(Best->Function);
3077 "getAssignOperatorMethod - copy assignment operator method not found");
3081 void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
3082 CXXConstructorDecl *CopyConstructor,
3083 unsigned TypeQuals) {
3084 assert((CopyConstructor->isImplicit() &&
3085 CopyConstructor->isCopyConstructor(Context, TypeQuals) &&
3086 !CopyConstructor->isUsed()) &&
3087 "DefineImplicitCopyConstructor - call it for implicit copy ctor");
3089 CXXRecordDecl *ClassDecl
3090 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext());
3091 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor");
3092 // C++ [class.copy] p209
3093 // Before the implicitly-declared copy constructor for a class is
3094 // implicitly defined, all the implicitly-declared copy constructors
3095 // for its base class and its non-static data members shall have been
3096 // implicitly defined.
3097 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin();
3098 Base != ClassDecl->bases_end(); ++Base) {
3099 CXXRecordDecl *BaseClassDecl
3100 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
3101 if (CXXConstructorDecl *BaseCopyCtor =
3102 BaseClassDecl->getCopyConstructor(Context, TypeQuals))
3103 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor);
3105 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
3106 FieldEnd = ClassDecl->field_end();
3107 Field != FieldEnd; ++Field) {
3108 QualType FieldType = Context.getCanonicalType((*Field)->getType());
3109 if (const ArrayType *Array = Context.getAsArrayType(FieldType))
3110 FieldType = Array->getElementType();
3111 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
3112 CXXRecordDecl *FieldClassDecl
3113 = cast<CXXRecordDecl>(FieldClassType->getDecl());
3114 if (CXXConstructorDecl *FieldCopyCtor =
3115 FieldClassDecl->getCopyConstructor(Context, TypeQuals))
3116 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor);
3119 CopyConstructor->setUsed();
3122 Sema::OwningExprResult
3123 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
3124 CXXConstructorDecl *Constructor,
3125 MultiExprArg ExprArgs) {
3126 bool Elidable = false;
3128 // C++ [class.copy]p15:
3129 // Whenever a temporary class object is copied using a copy constructor, and
3130 // this object and the copy have the same cv-unqualified type, an
3131 // implementation is permitted to treat the original and the copy as two
3132 // different ways of referring to the same object and not perform a copy at
3133 // all, even if the class copy constructor or destructor have side effects.
3135 // FIXME: Is this enough?
3136 if (Constructor->isCopyConstructor(Context)) {
3137 Expr *E = ((Expr **)ExprArgs.get())[0];
3138 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E))
3139 E = BE->getSubExpr();
3140 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
3141 if (ICE->getCastKind() == CastExpr::CK_NoOp)
3142 E = ICE->getSubExpr();
3144 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E))
3148 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor,
3149 Elidable, move(ExprArgs));
3152 /// BuildCXXConstructExpr - Creates a complete call to a constructor,
3153 /// including handling of its default argument expressions.
3154 Sema::OwningExprResult
3155 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
3156 CXXConstructorDecl *Constructor, bool Elidable,
3157 MultiExprArg ExprArgs) {
3158 unsigned NumExprs = ExprArgs.size();
3159 Expr **Exprs = (Expr **)ExprArgs.release();
3161 return Owned(CXXConstructExpr::Create(Context, DeclInitType, Constructor,
3162 Elidable, Exprs, NumExprs));
3165 Sema::OwningExprResult
3166 Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor,
3168 SourceLocation TyBeginLoc,
3170 SourceLocation RParenLoc) {
3171 unsigned NumExprs = Args.size();
3172 Expr **Exprs = (Expr **)Args.release();
3174 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty,
3176 NumExprs, RParenLoc));
3180 bool Sema::InitializeVarWithConstructor(VarDecl *VD,
3181 CXXConstructorDecl *Constructor,
3182 MultiExprArg Exprs) {
3183 OwningExprResult TempResult =
3184 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor,
3186 if (TempResult.isInvalid())
3189 Expr *Temp = TempResult.takeAs<Expr>();
3190 MarkDeclarationReferenced(VD->getLocation(), Constructor);
3191 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true);
3192 VD->setInit(Context, Temp);
3197 void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) {
3198 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(
3199 DeclInitType->getAs<RecordType>()->getDecl());
3200 if (!ClassDecl->hasTrivialDestructor())
3201 if (CXXDestructorDecl *Destructor =
3202 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context)))
3203 MarkDeclarationReferenced(VD->getLocation(), Destructor);
3206 /// AddCXXDirectInitializerToDecl - This action is called immediately after
3207 /// ActOnDeclarator, when a C++ direct initializer is present.
3208 /// e.g: "int x(1);"
3209 void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl,
3210 SourceLocation LParenLoc,
3212 SourceLocation *CommaLocs,
3213 SourceLocation RParenLoc) {
3214 unsigned NumExprs = Exprs.size();
3215 assert(NumExprs != 0 && Exprs.get() && "missing expressions");
3216 Decl *RealDecl = Dcl.getAs<Decl>();
3218 // If there is no declaration, there was an error parsing it. Just ignore
3223 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
3225 Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
3226 RealDecl->setInvalidDecl();
3230 // We will represent direct-initialization similarly to copy-initialization:
3231 // int x(1); -as-> int x = 1;
3232 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c);
3234 // Clients that want to distinguish between the two forms, can check for
3235 // direct initializer using VarDecl::hasCXXDirectInitializer().
3236 // A major benefit is that clients that don't particularly care about which
3237 // exactly form was it (like the CodeGen) can handle both cases without
3238 // special case code.
3240 // If either the declaration has a dependent type or if any of the expressions
3241 // is type-dependent, we represent the initialization via a ParenListExpr for
3242 // later use during template instantiation.
3243 if (VDecl->getType()->isDependentType() ||
3244 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) {
3245 // Let clients know that initialization was done with a direct initializer.
3246 VDecl->setCXXDirectInitializer(true);
3248 // Store the initialization expressions as a ParenListExpr.
3249 unsigned NumExprs = Exprs.size();
3250 VDecl->setInit(Context,
3251 new (Context) ParenListExpr(Context, LParenLoc,
3252 (Expr **)Exprs.release(),
3253 NumExprs, RParenLoc));
3259 // The form of initialization (using parentheses or '=') is generally
3260 // insignificant, but does matter when the entity being initialized has a
3262 QualType DeclInitType = VDecl->getType();
3263 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType))
3264 DeclInitType = Context.getBaseElementType(Array);
3266 // FIXME: This isn't the right place to complete the type.
3267 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(),
3268 diag::err_typecheck_decl_incomplete_type)) {
3269 VDecl->setInvalidDecl();
3273 if (VDecl->getType()->isRecordType()) {
3274 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
3276 CXXConstructorDecl *Constructor
3277 = PerformInitializationByConstructor(DeclInitType,
3279 VDecl->getLocation(),
3280 SourceRange(VDecl->getLocation(),
3282 VDecl->getDeclName(),
3286 RealDecl->setInvalidDecl();
3288 VDecl->setCXXDirectInitializer(true);
3289 if (InitializeVarWithConstructor(VDecl, Constructor,
3290 move_arg(ConstructorArgs)))
3291 RealDecl->setInvalidDecl();
3292 FinalizeVarWithDestructor(VDecl, DeclInitType);
3298 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg)
3299 << SourceRange(VDecl->getLocation(), RParenLoc);
3300 RealDecl->setInvalidDecl();
3304 // Let clients know that initialization was done with a direct initializer.
3305 VDecl->setCXXDirectInitializer(true);
3307 assert(NumExprs == 1 && "Expected 1 expression");
3308 // Set the init expression, handles conversions.
3309 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]),
3310 /*DirectInit=*/true);
3313 /// \brief Perform initialization by constructor (C++ [dcl.init]p14), which
3314 /// may occur as part of direct-initialization or copy-initialization.
3316 /// \param ClassType the type of the object being initialized, which must have
3319 /// \param ArgsPtr the arguments provided to initialize the object
3321 /// \param Loc the source location where the initialization occurs
3323 /// \param Range the source range that covers the entire initialization
3325 /// \param InitEntity the name of the entity being initialized, if known
3327 /// \param Kind the type of initialization being performed
3329 /// \param ConvertedArgs a vector that will be filled in with the
3330 /// appropriately-converted arguments to the constructor (if initialization
3333 /// \returns the constructor used to initialize the object, if successful.
3334 /// Otherwise, emits a diagnostic and returns NULL.
3335 CXXConstructorDecl *
3336 Sema::PerformInitializationByConstructor(QualType ClassType,
3337 MultiExprArg ArgsPtr,
3338 SourceLocation Loc, SourceRange Range,
3339 DeclarationName InitEntity,
3340 InitializationKind Kind,
3341 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) {
3342 const RecordType *ClassRec = ClassType->getAs<RecordType>();
3343 assert(ClassRec && "Can only initialize a class type here");
3344 Expr **Args = (Expr **)ArgsPtr.get();
3345 unsigned NumArgs = ArgsPtr.size();
3347 // C++ [dcl.init]p14:
3348 // If the initialization is direct-initialization, or if it is
3349 // copy-initialization where the cv-unqualified version of the
3350 // source type is the same class as, or a derived class of, the
3351 // class of the destination, constructors are considered. The
3352 // applicable constructors are enumerated (13.3.1.3), and the
3353 // best one is chosen through overload resolution (13.3). The
3354 // constructor so selected is called to initialize the object,
3355 // with the initializer expression(s) as its argument(s). If no
3356 // constructor applies, or the overload resolution is ambiguous,
3357 // the initialization is ill-formed.
3358 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl());
3359 OverloadCandidateSet CandidateSet;
3361 // Add constructors to the overload set.
3362 DeclarationName ConstructorName
3363 = Context.DeclarationNames.getCXXConstructorName(
3364 Context.getCanonicalType(ClassType.getUnqualifiedType()));
3365 DeclContext::lookup_const_iterator Con, ConEnd;
3366 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName);
3367 Con != ConEnd; ++Con) {
3368 // Find the constructor (which may be a template).
3369 CXXConstructorDecl *Constructor = 0;
3370 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con);
3371 if (ConstructorTmpl)
3373 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl());
3375 Constructor = cast<CXXConstructorDecl>(*Con);
3377 if ((Kind == IK_Direct) ||
3379 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) ||
3380 (Kind == IK_Default && Constructor->isDefaultConstructor())) {
3381 if (ConstructorTmpl)
3382 AddTemplateOverloadCandidate(ConstructorTmpl, false, 0, 0,
3383 Args, NumArgs, CandidateSet);
3385 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet);
3389 // FIXME: When we decide not to synthesize the implicitly-declared
3390 // constructors, we'll need to make them appear here.
3392 OverloadCandidateSet::iterator Best;
3393 switch (BestViableFunction(CandidateSet, Loc, Best)) {
3395 // We found a constructor. Break out so that we can convert the arguments
3399 case OR_No_Viable_Function:
3401 Diag(Loc, diag::err_ovl_no_viable_function_in_init)
3402 << InitEntity << Range;
3404 Diag(Loc, diag::err_ovl_no_viable_function_in_init)
3405 << ClassType << Range;
3406 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false);
3411 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range;
3413 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range;
3414 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
3419 Diag(Loc, diag::err_ovl_deleted_init)
3420 << Best->Function->isDeleted()
3421 << InitEntity << Range;
3423 Diag(Loc, diag::err_ovl_deleted_init)
3424 << Best->Function->isDeleted()
3425 << InitEntity << Range;
3426 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
3430 // Convert the arguments, fill in default arguments, etc.
3431 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function);
3432 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs))
3438 /// \brief Given a constructor and the set of arguments provided for the
3439 /// constructor, convert the arguments and add any required default arguments
3440 /// to form a proper call to this constructor.
3442 /// \returns true if an error occurred, false otherwise.
3444 Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor,
3445 MultiExprArg ArgsPtr,
3447 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) {
3448 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall.
3449 unsigned NumArgs = ArgsPtr.size();
3450 Expr **Args = (Expr **)ArgsPtr.get();
3452 const FunctionProtoType *Proto
3453 = Constructor->getType()->getAs<FunctionProtoType>();
3454 assert(Proto && "Constructor without a prototype?");
3455 unsigned NumArgsInProto = Proto->getNumArgs();
3456 unsigned NumArgsToCheck = NumArgs;
3458 // If too few arguments are available, we'll fill in the rest with defaults.
3459 if (NumArgs < NumArgsInProto) {
3460 NumArgsToCheck = NumArgsInProto;
3461 ConvertedArgs.reserve(NumArgsInProto);
3463 ConvertedArgs.reserve(NumArgs);
3464 if (NumArgs > NumArgsInProto)
3465 NumArgsToCheck = NumArgsInProto;
3468 // Convert arguments
3469 for (unsigned i = 0; i != NumArgsToCheck; i++) {
3470 QualType ProtoArgType = Proto->getArgType(i);
3476 // Pass the argument.
3477 if (PerformCopyInitialization(Arg, ProtoArgType, "passing"))
3482 ParmVarDecl *Param = Constructor->getParamDecl(i);
3484 OwningExprResult DefArg = BuildCXXDefaultArgExpr(Loc, Constructor, Param);
3485 if (DefArg.isInvalid())
3488 Arg = DefArg.takeAs<Expr>();
3491 ConvertedArgs.push_back(Arg);
3494 // If this is a variadic call, handle args passed through "...".
3495 if (Proto->isVariadic()) {
3496 // Promote the arguments (C99 6.5.2.2p7).
3497 for (unsigned i = NumArgsInProto; i != NumArgs; i++) {
3498 Expr *Arg = Args[i];
3499 if (DefaultVariadicArgumentPromotion(Arg, VariadicConstructor))
3502 ConvertedArgs.push_back(Arg);
3510 /// CompareReferenceRelationship - Compare the two types T1 and T2 to
3511 /// determine whether they are reference-related,
3512 /// reference-compatible, reference-compatible with added
3513 /// qualification, or incompatible, for use in C++ initialization by
3514 /// reference (C++ [dcl.ref.init]p4). Neither type can be a reference
3515 /// type, and the first type (T1) is the pointee type of the reference
3516 /// type being initialized.
3517 Sema::ReferenceCompareResult
3518 Sema::CompareReferenceRelationship(QualType T1, QualType T2,
3519 bool& DerivedToBase) {
3520 assert(!T1->isReferenceType() &&
3521 "T1 must be the pointee type of the reference type");
3522 assert(!T2->isReferenceType() && "T2 cannot be a reference type");
3524 T1 = Context.getCanonicalType(T1);
3525 T2 = Context.getCanonicalType(T2);
3526 QualType UnqualT1 = T1.getUnqualifiedType();
3527 QualType UnqualT2 = T2.getUnqualifiedType();
3529 // C++ [dcl.init.ref]p4:
3530 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is
3531 // reference-related to "cv2 T2" if T1 is the same type as T2, or
3532 // T1 is a base class of T2.
3533 if (UnqualT1 == UnqualT2)
3534 DerivedToBase = false;
3535 else if (IsDerivedFrom(UnqualT2, UnqualT1))
3536 DerivedToBase = true;
3538 return Ref_Incompatible;
3540 // At this point, we know that T1 and T2 are reference-related (at
3543 // C++ [dcl.init.ref]p4:
3544 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is
3545 // reference-related to T2 and cv1 is the same cv-qualification
3546 // as, or greater cv-qualification than, cv2. For purposes of
3547 // overload resolution, cases for which cv1 is greater
3548 // cv-qualification than cv2 are identified as
3549 // reference-compatible with added qualification (see 13.3.3.2).
3550 if (T1.getCVRQualifiers() == T2.getCVRQualifiers())
3551 return Ref_Compatible;
3552 else if (T1.isMoreQualifiedThan(T2))
3553 return Ref_Compatible_With_Added_Qualification;
3558 /// CheckReferenceInit - Check the initialization of a reference
3559 /// variable with the given initializer (C++ [dcl.init.ref]). Init is
3560 /// the initializer (either a simple initializer or an initializer
3561 /// list), and DeclType is the type of the declaration. When ICS is
3562 /// non-null, this routine will compute the implicit conversion
3563 /// sequence according to C++ [over.ics.ref] and will not produce any
3564 /// diagnostics; when ICS is null, it will emit diagnostics when any
3565 /// errors are found. Either way, a return value of true indicates
3566 /// that there was a failure, a return value of false indicates that
3567 /// the reference initialization succeeded.
3569 /// When @p SuppressUserConversions, user-defined conversions are
3571 /// When @p AllowExplicit, we also permit explicit user-defined
3572 /// conversion functions.
3573 /// When @p ForceRValue, we unconditionally treat the initializer as an rvalue.
3575 Sema::CheckReferenceInit(Expr *&Init, QualType DeclType,
3576 SourceLocation DeclLoc,
3577 bool SuppressUserConversions,
3578 bool AllowExplicit, bool ForceRValue,
3579 ImplicitConversionSequence *ICS) {
3580 assert(DeclType->isReferenceType() && "Reference init needs a reference");
3582 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType();
3583 QualType T2 = Init->getType();
3585 // If the initializer is the address of an overloaded function, try
3586 // to resolve the overloaded function. If all goes well, T2 is the
3587 // type of the resulting function.
3588 if (Context.getCanonicalType(T2) == Context.OverloadTy) {
3589 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType,
3592 // Since we're performing this reference-initialization for
3593 // real, update the initializer with the resulting function.
3595 if (DiagnoseUseOfDecl(Fn, DeclLoc))
3598 Init = FixOverloadedFunctionReference(Init, Fn);
3605 // Compute some basic properties of the types and the initializer.
3606 bool isRValRef = DeclType->isRValueReferenceType();
3607 bool DerivedToBase = false;
3608 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression :
3609 Init->isLvalue(Context);
3610 ReferenceCompareResult RefRelationship
3611 = CompareReferenceRelationship(T1, T2, DerivedToBase);
3613 // Most paths end in a failed conversion.
3615 ICS->ConversionKind = ImplicitConversionSequence::BadConversion;
3617 // C++ [dcl.init.ref]p5:
3618 // A reference to type "cv1 T1" is initialized by an expression
3619 // of type "cv2 T2" as follows:
3621 // -- If the initializer expression
3623 // Rvalue references cannot bind to lvalues (N2812).
3624 // There is absolutely no situation where they can. In particular, note that
3625 // this is ill-formed, even if B has a user-defined conversion to A&&:
3628 if (isRValRef && InitLvalue == Expr::LV_Valid) {
3630 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref)
3631 << Init->getSourceRange();
3635 bool BindsDirectly = false;
3636 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is
3637 // reference-compatible with "cv2 T2," or
3639 // Note that the bit-field check is skipped if we are just computing
3640 // the implicit conversion sequence (C++ [over.best.ics]p2).
3641 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) &&
3642 RefRelationship >= Ref_Compatible_With_Added_Qualification) {
3643 BindsDirectly = true;
3646 // C++ [over.ics.ref]p1:
3647 // When a parameter of reference type binds directly (8.5.3)
3648 // to an argument expression, the implicit conversion sequence
3649 // is the identity conversion, unless the argument expression
3650 // has a type that is a derived class of the parameter type,
3651 // in which case the implicit conversion sequence is a
3652 // derived-to-base Conversion (13.3.3.1).
3653 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion;
3654 ICS->Standard.First = ICK_Identity;
3655 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity;
3656 ICS->Standard.Third = ICK_Identity;
3657 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr();
3658 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr();
3659 ICS->Standard.ReferenceBinding = true;
3660 ICS->Standard.DirectBinding = true;
3661 ICS->Standard.RRefBinding = false;
3662 ICS->Standard.CopyConstructor = 0;
3664 // Nothing more to do: the inaccessibility/ambiguity check for
3665 // derived-to-base conversions is suppressed when we're
3666 // computing the implicit conversion sequence (C++
3667 // [over.best.ics]p2).
3670 // Perform the conversion.
3671 CastExpr::CastKind CK = CastExpr::CK_NoOp;
3673 CK = CastExpr::CK_DerivedToBase;
3674 else if(CheckExceptionSpecCompatibility(Init, T1))
3676 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true);
3680 // -- has a class type (i.e., T2 is a class type) and can be
3681 // implicitly converted to an lvalue of type "cv3 T3,"
3682 // where "cv1 T1" is reference-compatible with "cv3 T3"
3683 // 92) (this conversion is selected by enumerating the
3684 // applicable conversion functions (13.3.1.6) and choosing
3685 // the best one through overload resolution (13.3)),
3686 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() &&
3687 !RequireCompleteType(DeclLoc, T2, 0)) {
3688 CXXRecordDecl *T2RecordDecl
3689 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl());
3691 OverloadCandidateSet CandidateSet;
3692 OverloadedFunctionDecl *Conversions
3693 = T2RecordDecl->getVisibleConversionFunctions();
3694 for (OverloadedFunctionDecl::function_iterator Func
3695 = Conversions->function_begin();
3696 Func != Conversions->function_end(); ++Func) {
3697 FunctionTemplateDecl *ConvTemplate
3698 = dyn_cast<FunctionTemplateDecl>(*Func);
3699 CXXConversionDecl *Conv;
3701 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
3703 Conv = cast<CXXConversionDecl>(*Func);
3705 // If the conversion function doesn't return a reference type,
3706 // it can't be considered for this conversion.
3707 if (Conv->getConversionType()->isLValueReferenceType() &&
3708 (AllowExplicit || !Conv->isExplicit())) {
3710 AddTemplateConversionCandidate(ConvTemplate, Init, DeclType,
3713 AddConversionCandidate(Conv, Init, DeclType, CandidateSet);
3717 OverloadCandidateSet::iterator Best;
3718 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) {
3720 // This is a direct binding.
3721 BindsDirectly = true;
3724 // C++ [over.ics.ref]p1:
3726 // [...] If the parameter binds directly to the result of
3727 // applying a conversion function to the argument
3728 // expression, the implicit conversion sequence is a
3729 // user-defined conversion sequence (13.3.3.1.2), with the
3730 // second standard conversion sequence either an identity
3731 // conversion or, if the conversion function returns an
3732 // entity of a type that is a derived class of the parameter
3733 // type, a derived-to-base Conversion.
3734 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion;
3735 ICS->UserDefined.Before = Best->Conversions[0].Standard;
3736 ICS->UserDefined.After = Best->FinalConversion;
3737 ICS->UserDefined.ConversionFunction = Best->Function;
3738 assert(ICS->UserDefined.After.ReferenceBinding &&
3739 ICS->UserDefined.After.DirectBinding &&
3740 "Expected a direct reference binding!");
3743 OwningExprResult InitConversion =
3744 BuildCXXCastArgument(DeclLoc, QualType(),
3745 CastExpr::CK_UserDefinedConversion,
3746 cast<CXXMethodDecl>(Best->Function),
3748 Init = InitConversion.takeAs<Expr>();
3750 if (CheckExceptionSpecCompatibility(Init, T1))
3752 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion,
3759 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin();
3760 Cand != CandidateSet.end(); ++Cand)
3762 ICS->ConversionFunctionSet.push_back(Cand->Function);
3765 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType()
3766 << Init->getSourceRange();
3767 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
3770 case OR_No_Viable_Function:
3772 // There was no suitable conversion, or we found a deleted
3773 // conversion; continue with other checks.
3778 if (BindsDirectly) {
3779 // C++ [dcl.init.ref]p4:
3780 // [...] In all cases where the reference-related or
3781 // reference-compatible relationship of two types is used to
3782 // establish the validity of a reference binding, and T1 is a
3783 // base class of T2, a program that necessitates such a binding
3784 // is ill-formed if T1 is an inaccessible (clause 11) or
3785 // ambiguous (10.2) base class of T2.
3787 // Note that we only check this condition when we're allowed to
3788 // complain about errors, because we should not be checking for
3789 // ambiguity (or inaccessibility) unless the reference binding
3790 // actually happens.
3792 return CheckDerivedToBaseConversion(T2, T1, DeclLoc,
3793 Init->getSourceRange());
3798 // -- Otherwise, the reference shall be to a non-volatile const
3799 // type (i.e., cv1 shall be const), or the reference shall be an
3800 // rvalue reference and the initializer expression shall be an rvalue.
3801 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) {
3803 Diag(DeclLoc, diag::err_not_reference_to_const_init)
3804 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value")
3805 << T2 << Init->getSourceRange();
3809 // -- If the initializer expression is an rvalue, with T2 a
3810 // class type, and "cv1 T1" is reference-compatible with
3811 // "cv2 T2," the reference is bound in one of the
3812 // following ways (the choice is implementation-defined):
3814 // -- The reference is bound to the object represented by
3815 // the rvalue (see 3.10) or to a sub-object within that
3818 // -- A temporary of type "cv1 T2" [sic] is created, and
3819 // a constructor is called to copy the entire rvalue
3820 // object into the temporary. The reference is bound to
3821 // the temporary or to a sub-object within the
3824 // The constructor that would be used to make the copy
3825 // shall be callable whether or not the copy is actually
3828 // Note that C++0x [dcl.init.ref]p5 takes away this implementation
3829 // freedom, so we will always take the first option and never build
3830 // a temporary in this case. FIXME: We will, however, have to check
3831 // for the presence of a copy constructor in C++98/03 mode.
3832 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() &&
3833 RefRelationship >= Ref_Compatible_With_Added_Qualification) {
3835 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion;
3836 ICS->Standard.First = ICK_Identity;
3837 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity;
3838 ICS->Standard.Third = ICK_Identity;
3839 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr();
3840 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr();
3841 ICS->Standard.ReferenceBinding = true;
3842 ICS->Standard.DirectBinding = false;
3843 ICS->Standard.RRefBinding = isRValRef;
3844 ICS->Standard.CopyConstructor = 0;
3846 CastExpr::CastKind CK = CastExpr::CK_NoOp;
3848 CK = CastExpr::CK_DerivedToBase;
3849 else if(CheckExceptionSpecCompatibility(Init, T1))
3851 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false);
3856 // -- Otherwise, a temporary of type "cv1 T1" is created and
3857 // initialized from the initializer expression using the
3858 // rules for a non-reference copy initialization (8.5). The
3859 // reference is then bound to the temporary. If T1 is
3860 // reference-related to T2, cv1 must be the same
3861 // cv-qualification as, or greater cv-qualification than,
3862 // cv2; otherwise, the program is ill-formed.
3863 if (RefRelationship == Ref_Related) {
3864 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then
3865 // we would be reference-compatible or reference-compatible with
3866 // added qualification. But that wasn't the case, so the reference
3867 // initialization fails.
3869 Diag(DeclLoc, diag::err_reference_init_drops_quals)
3870 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value")
3871 << T2 << Init->getSourceRange();
3875 // If at least one of the types is a class type, the types are not
3876 // related, and we aren't allowed any user conversions, the
3877 // reference binding fails. This case is important for breaking
3878 // recursion, since TryImplicitConversion below will attempt to
3879 // create a temporary through the use of a copy constructor.
3880 if (SuppressUserConversions && RefRelationship == Ref_Incompatible &&
3881 (T1->isRecordType() || T2->isRecordType())) {
3883 Diag(DeclLoc, diag::err_typecheck_convert_incompatible)
3884 << DeclType << Init->getType() << "initializing" << Init->getSourceRange();
3888 // Actually try to convert the initializer to T1.
3890 // C++ [over.ics.ref]p2:
3892 // When a parameter of reference type is not bound directly to
3893 // an argument expression, the conversion sequence is the one
3894 // required to convert the argument expression to the
3895 // underlying type of the reference according to
3896 // 13.3.3.1. Conceptually, this conversion sequence corresponds
3897 // to copy-initializing a temporary of the underlying type with
3898 // the argument expression. Any difference in top-level
3899 // cv-qualification is subsumed by the initialization itself
3900 // and does not constitute a conversion.
3901 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions,
3902 /*AllowExplicit=*/false,
3903 /*ForceRValue=*/false,
3904 /*InOverloadResolution=*/false);
3906 // Of course, that's still a reference binding.
3907 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) {
3908 ICS->Standard.ReferenceBinding = true;
3909 ICS->Standard.RRefBinding = isRValRef;
3910 } else if (ICS->ConversionKind ==
3911 ImplicitConversionSequence::UserDefinedConversion) {
3912 ICS->UserDefined.After.ReferenceBinding = true;
3913 ICS->UserDefined.After.RRefBinding = isRValRef;
3915 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion;
3917 ImplicitConversionSequence Conversions;
3918 bool badConversion = PerformImplicitConversion(Init, T1, "initializing",
3921 if (badConversion) {
3922 if ((Conversions.ConversionKind ==
3923 ImplicitConversionSequence::BadConversion)
3924 && !Conversions.ConversionFunctionSet.empty()) {
3926 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange();
3927 for (int j = Conversions.ConversionFunctionSet.size()-1;
3929 FunctionDecl *Func = Conversions.ConversionFunctionSet[j];
3930 Diag(Func->getLocation(), diag::err_ovl_candidate);
3935 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref)
3936 << Init->getSourceRange();
3938 Diag(DeclLoc, diag::err_invalid_initialization)
3939 << DeclType << Init->getType() << Init->getSourceRange();
3942 return badConversion;
3946 /// CheckOverloadedOperatorDeclaration - Check whether the declaration
3947 /// of this overloaded operator is well-formed. If so, returns false;
3948 /// otherwise, emits appropriate diagnostics and returns true.
3949 bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
3950 assert(FnDecl && FnDecl->isOverloadedOperator() &&
3951 "Expected an overloaded operator declaration");
3953 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator();
3955 // C++ [over.oper]p5:
3956 // The allocation and deallocation functions, operator new,
3957 // operator new[], operator delete and operator delete[], are
3958 // described completely in 3.7.3. The attributes and restrictions
3959 // found in the rest of this subclause do not apply to them unless
3960 // explicitly stated in 3.7.3.
3961 // FIXME: Write a separate routine for checking this. For now, just allow it.
3962 if (Op == OO_New || Op == OO_Array_New ||
3963 Op == OO_Delete || Op == OO_Array_Delete)
3966 // C++ [over.oper]p6:
3967 // An operator function shall either be a non-static member
3968 // function or be a non-member function and have at least one
3969 // parameter whose type is a class, a reference to a class, an
3970 // enumeration, or a reference to an enumeration.
3971 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) {
3972 if (MethodDecl->isStatic())
3973 return Diag(FnDecl->getLocation(),
3974 diag::err_operator_overload_static) << FnDecl->getDeclName();
3976 bool ClassOrEnumParam = false;
3977 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(),
3978 ParamEnd = FnDecl->param_end();
3979 Param != ParamEnd; ++Param) {
3980 QualType ParamType = (*Param)->getType().getNonReferenceType();
3981 if (ParamType->isDependentType() || ParamType->isRecordType() ||
3982 ParamType->isEnumeralType()) {
3983 ClassOrEnumParam = true;
3988 if (!ClassOrEnumParam)
3989 return Diag(FnDecl->getLocation(),
3990 diag::err_operator_overload_needs_class_or_enum)
3991 << FnDecl->getDeclName();
3994 // C++ [over.oper]p8:
3995 // An operator function cannot have default arguments (8.3.6),
3996 // except where explicitly stated below.
3998 // Only the function-call operator allows default arguments
3999 // (C++ [over.call]p1).
4000 if (Op != OO_Call) {
4001 for (FunctionDecl::param_iterator Param = FnDecl->param_begin();
4002 Param != FnDecl->param_end(); ++Param) {
4003 if ((*Param)->hasUnparsedDefaultArg())
4004 return Diag((*Param)->getLocation(),
4005 diag::err_operator_overload_default_arg)
4006 << FnDecl->getDeclName();
4007 else if (Expr *DefArg = (*Param)->getDefaultArg())
4008 return Diag((*Param)->getLocation(),
4009 diag::err_operator_overload_default_arg)
4010 << FnDecl->getDeclName() << DefArg->getSourceRange();
4014 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = {
4015 { false, false, false }
4016 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
4017 , { Unary, Binary, MemberOnly }
4018 #include "clang/Basic/OperatorKinds.def"
4021 bool CanBeUnaryOperator = OperatorUses[Op][0];
4022 bool CanBeBinaryOperator = OperatorUses[Op][1];
4023 bool MustBeMemberOperator = OperatorUses[Op][2];
4025 // C++ [over.oper]p8:
4026 // [...] Operator functions cannot have more or fewer parameters
4027 // than the number required for the corresponding operator, as
4028 // described in the rest of this subclause.
4029 unsigned NumParams = FnDecl->getNumParams()
4030 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0);
4031 if (Op != OO_Call &&
4032 ((NumParams == 1 && !CanBeUnaryOperator) ||
4033 (NumParams == 2 && !CanBeBinaryOperator) ||
4034 (NumParams < 1) || (NumParams > 2))) {
4035 // We have the wrong number of parameters.
4037 if (CanBeUnaryOperator && CanBeBinaryOperator) {
4038 ErrorKind = 2; // 2 -> unary or binary.
4039 } else if (CanBeUnaryOperator) {
4040 ErrorKind = 0; // 0 -> unary
4042 assert(CanBeBinaryOperator &&
4043 "All non-call overloaded operators are unary or binary!");
4044 ErrorKind = 1; // 1 -> binary
4047 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be)
4048 << FnDecl->getDeclName() << NumParams << ErrorKind;
4051 // Overloaded operators other than operator() cannot be variadic.
4052 if (Op != OO_Call &&
4053 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) {
4054 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic)
4055 << FnDecl->getDeclName();
4058 // Some operators must be non-static member functions.
4059 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) {
4060 return Diag(FnDecl->getLocation(),
4061 diag::err_operator_overload_must_be_member)
4062 << FnDecl->getDeclName();
4065 // C++ [over.inc]p1:
4066 // The user-defined function called operator++ implements the
4067 // prefix and postfix ++ operator. If this function is a member
4068 // function with no parameters, or a non-member function with one
4069 // parameter of class or enumeration type, it defines the prefix
4070 // increment operator ++ for objects of that type. If the function
4071 // is a member function with one parameter (which shall be of type
4072 // int) or a non-member function with two parameters (the second
4073 // of which shall be of type int), it defines the postfix
4074 // increment operator ++ for objects of that type.
4075 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) {
4076 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1);
4077 bool ParamIsInt = false;
4078 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>())
4079 ParamIsInt = BT->getKind() == BuiltinType::Int;
4082 return Diag(LastParam->getLocation(),
4083 diag::err_operator_overload_post_incdec_must_be_int)
4084 << LastParam->getType() << (Op == OO_MinusMinus);
4087 // Notify the class if it got an assignment operator.
4088 if (Op == OO_Equal) {
4089 // Would have returned earlier otherwise.
4090 assert(isa<CXXMethodDecl>(FnDecl) &&
4091 "Overloaded = not member, but not filtered.");
4092 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl);
4093 Method->setCopyAssignment(true);
4094 Method->getParent()->addedAssignmentOperator(Context, Method);
4100 /// ActOnStartLinkageSpecification - Parsed the beginning of a C++
4101 /// linkage specification, including the language and (if present)
4102 /// the '{'. ExternLoc is the location of the 'extern', LangLoc is
4103 /// the location of the language string literal, which is provided
4104 /// by Lang/StrSize. LBraceLoc, if valid, provides the location of
4105 /// the '{' brace. Otherwise, this linkage specification does not
4106 /// have any braces.
4107 Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S,
4108 SourceLocation ExternLoc,
4109 SourceLocation LangLoc,
4112 SourceLocation LBraceLoc) {
4113 LinkageSpecDecl::LanguageIDs Language;
4114 if (strncmp(Lang, "\"C\"", StrSize) == 0)
4115 Language = LinkageSpecDecl::lang_c;
4116 else if (strncmp(Lang, "\"C++\"", StrSize) == 0)
4117 Language = LinkageSpecDecl::lang_cxx;
4119 Diag(LangLoc, diag::err_bad_language);
4123 // FIXME: Add all the various semantics of linkage specifications
4125 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext,
4127 LBraceLoc.isValid());
4128 CurContext->addDecl(D);
4129 PushDeclContext(S, D);
4130 return DeclPtrTy::make(D);
4133 /// ActOnFinishLinkageSpecification - Completely the definition of
4134 /// the C++ linkage specification LinkageSpec. If RBraceLoc is
4135 /// valid, it's the position of the closing '}' brace in a linkage
4136 /// specification that uses braces.
4137 Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S,
4138 DeclPtrTy LinkageSpec,
4139 SourceLocation RBraceLoc) {
4145 /// \brief Perform semantic analysis for the variable declaration that
4146 /// occurs within a C++ catch clause, returning the newly-created
4148 VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType,
4149 DeclaratorInfo *DInfo,
4150 IdentifierInfo *Name,
4152 SourceRange Range) {
4153 bool Invalid = false;
4155 // Arrays and functions decay.
4156 if (ExDeclType->isArrayType())
4157 ExDeclType = Context.getArrayDecayedType(ExDeclType);
4158 else if (ExDeclType->isFunctionType())
4159 ExDeclType = Context.getPointerType(ExDeclType);
4161 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type.
4162 // The exception-declaration shall not denote a pointer or reference to an
4163 // incomplete type, other than [cv] void*.
4164 // N2844 forbids rvalue references.
4165 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) {
4166 Diag(Loc, diag::err_catch_rvalue_ref) << Range;
4170 QualType BaseType = ExDeclType;
4171 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference
4172 unsigned DK = diag::err_catch_incomplete;
4173 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
4174 BaseType = Ptr->getPointeeType();
4176 DK = diag::err_catch_incomplete_ptr;
4177 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) {
4178 // For the purpose of error recovery, we treat rvalue refs like lvalue refs.
4179 BaseType = Ref->getPointeeType();
4181 DK = diag::err_catch_incomplete_ref;
4183 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) &&
4184 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK))
4187 if (!Invalid && !ExDeclType->isDependentType() &&
4188 RequireNonAbstractType(Loc, ExDeclType,
4189 diag::err_abstract_type_in_decl,
4190 AbstractVariableType))
4193 // FIXME: Need to test for ability to copy-construct and destroy the
4194 // exception variable.
4196 // FIXME: Need to check for abstract classes.
4198 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc,
4199 Name, ExDeclType, DInfo, VarDecl::None);
4202 ExDecl->setInvalidDecl();
4207 /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
4209 Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
4210 DeclaratorInfo *DInfo = 0;
4211 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo);
4213 bool Invalid = D.isInvalidType();
4214 IdentifierInfo *II = D.getIdentifier();
4215 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) {
4216 // The scope should be freshly made just for us. There is just no way
4217 // it contains any previous declaration.
4218 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl)));
4219 if (PrevDecl->isTemplateParameter()) {
4220 // Maybe we will complain about the shadowed template parameter.
4221 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
4225 if (D.getCXXScopeSpec().isSet() && !Invalid) {
4226 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator)
4227 << D.getCXXScopeSpec().getRange();
4231 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo,
4233 D.getIdentifierLoc(),
4234 D.getDeclSpec().getSourceRange());
4237 ExDecl->setInvalidDecl();
4239 // Add the exception declaration into this scope.
4241 PushOnScopeChains(ExDecl, S);
4243 CurContext->addDecl(ExDecl);
4245 ProcessDeclAttributes(S, ExDecl, D);
4246 return DeclPtrTy::make(ExDecl);
4249 Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc,
4251 ExprArg assertmessageexpr) {
4252 Expr *AssertExpr = (Expr *)assertexpr.get();
4253 StringLiteral *AssertMessage =
4254 cast<StringLiteral>((Expr *)assertmessageexpr.get());
4256 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) {
4257 llvm::APSInt Value(32);
4258 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) {
4259 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) <<
4260 AssertExpr->getSourceRange();
4265 std::string str(AssertMessage->getStrData(),
4266 AssertMessage->getByteLength());
4267 Diag(AssertLoc, diag::err_static_assert_failed)
4268 << str << AssertExpr->getSourceRange();
4272 assertexpr.release();
4273 assertmessageexpr.release();
4274 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc,
4275 AssertExpr, AssertMessage);
4277 CurContext->addDecl(Decl);
4278 return DeclPtrTy::make(Decl);
4281 /// Handle a friend type declaration. This works in tandem with
4284 /// Notes on friend class templates:
4286 /// We generally treat friend class declarations as if they were
4287 /// declaring a class. So, for example, the elaborated type specifier
4288 /// in a friend declaration is required to obey the restrictions of a
4289 /// class-head (i.e. no typedefs in the scope chain), template
4290 /// parameters are required to match up with simple template-ids, &c.
4291 /// However, unlike when declaring a template specialization, it's
4292 /// okay to refer to a template specialization without an empty
4293 /// template parameter declaration, e.g.
4294 /// friend class A<T>::B<unsigned>;
4295 /// We permit this as a special case; if there are any template
4296 /// parameters present at all, require proper matching, i.e.
4297 /// template <> template <class T> friend class A<int>::B;
4298 Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
4299 MultiTemplateParamsArg TempParams) {
4300 SourceLocation Loc = DS.getSourceRange().getBegin();
4302 assert(DS.isFriendSpecified());
4303 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
4305 // Try to convert the decl specifier to a type. This works for
4306 // friend templates because ActOnTag never produces a ClassTemplateDecl
4307 // for a TUK_Friend.
4308 Declarator TheDeclarator(DS, Declarator::MemberContext);
4309 QualType T = GetTypeForDeclarator(TheDeclarator, S);
4310 if (TheDeclarator.isInvalidType())
4313 // This is definitely an error in C++98. It's probably meant to
4314 // be forbidden in C++0x, too, but the specification is just
4317 // The problem is with declarations like the following:
4318 // template <T> friend A<T>::foo;
4319 // where deciding whether a class C is a friend or not now hinges
4320 // on whether there exists an instantiation of A that causes
4321 // 'foo' to equal C. There are restrictions on class-heads
4322 // (which we declare (by fiat) elaborated friend declarations to
4323 // be) that makes this tractable.
4325 // FIXME: handle "template <> friend class A<T>;", which
4326 // is possibly well-formed? Who even knows?
4327 if (TempParams.size() && !isa<ElaboratedType>(T)) {
4328 Diag(Loc, diag::err_tagless_friend_type_template)
4329 << DS.getSourceRange();
4333 // C++ [class.friend]p2:
4334 // An elaborated-type-specifier shall be used in a friend declaration
4336 // * The class-key of the elaborated-type-specifier is required.
4337 // This is one of the rare places in Clang where it's legitimate to
4338 // ask about the "spelling" of the type.
4339 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) {
4340 // If we evaluated the type to a record type, suggest putting
4342 if (const RecordType *RT = T->getAs<RecordType>()) {
4343 RecordDecl *RD = RT->getDecl();
4345 std::string InsertionText = std::string(" ") + RD->getKindName();
4347 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type)
4348 << (unsigned) RD->getTagKind()
4350 << SourceRange(DS.getFriendSpecLoc())
4351 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(),
4355 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend)
4356 << DS.getSourceRange();
4361 // Enum types cannot be friends.
4362 if (T->getAs<EnumType>()) {
4363 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend)
4364 << SourceRange(DS.getFriendSpecLoc());
4368 // C++98 [class.friend]p1: A friend of a class is a function
4369 // or class that is not a member of the class . . .
4370 // But that's a silly restriction which nobody implements for
4371 // inner classes, and C++0x removes it anyway, so we only report
4372 // this (as a warning) if we're being pedantic.
4373 if (!getLangOptions().CPlusPlus0x)
4374 if (const RecordType *RT = T->getAs<RecordType>())
4375 if (RT->getDecl()->getDeclContext() == CurContext)
4376 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class);
4379 if (TempParams.size())
4380 D = FriendTemplateDecl::Create(Context, CurContext, Loc,
4382 (TemplateParameterList**) TempParams.release(),
4384 DS.getFriendSpecLoc());
4386 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(),
4387 DS.getFriendSpecLoc());
4388 D->setAccess(AS_public);
4389 CurContext->addDecl(D);
4391 return DeclPtrTy::make(D);
4395 Sema::ActOnFriendFunctionDecl(Scope *S,
4398 MultiTemplateParamsArg TemplateParams) {
4399 const DeclSpec &DS = D.getDeclSpec();
4401 assert(DS.isFriendSpecified());
4402 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
4404 SourceLocation Loc = D.getIdentifierLoc();
4405 DeclaratorInfo *DInfo = 0;
4406 QualType T = GetTypeForDeclarator(D, S, &DInfo);
4408 // C++ [class.friend]p1
4409 // A friend of a class is a function or class....
4410 // Note that this sees through typedefs, which is intended.
4411 // It *doesn't* see through dependent types, which is correct
4412 // according to [temp.arg.type]p3:
4413 // If a declaration acquires a function type through a
4414 // type dependent on a template-parameter and this causes
4415 // a declaration that does not use the syntactic form of a
4416 // function declarator to have a function type, the program
4418 if (!T->isFunctionType()) {
4419 Diag(Loc, diag::err_unexpected_friend);
4421 // It might be worthwhile to try to recover by creating an
4422 // appropriate declaration.
4426 // C++ [namespace.memdef]p3
4427 // - If a friend declaration in a non-local class first declares a
4428 // class or function, the friend class or function is a member
4429 // of the innermost enclosing namespace.
4430 // - The name of the friend is not found by simple name lookup
4431 // until a matching declaration is provided in that namespace
4432 // scope (either before or after the class declaration granting
4434 // - If a friend function is called, its name may be found by the
4435 // name lookup that considers functions from namespaces and
4436 // classes associated with the types of the function arguments.
4437 // - When looking for a prior declaration of a class or a function
4438 // declared as a friend, scopes outside the innermost enclosing
4439 // namespace scope are not considered.
4441 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec();
4442 DeclarationName Name = GetNameForDeclarator(D);
4445 // The context we found the declaration in, or in which we should
4446 // create the declaration.
4449 // FIXME: handle local classes
4451 // Recover from invalid scope qualifiers as if they just weren't there.
4452 NamedDecl *PrevDecl = 0;
4453 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) {
4454 // FIXME: RequireCompleteDeclContext
4455 DC = computeDeclContext(ScopeQual);
4457 // FIXME: handle dependent contexts
4458 if (!DC) return DeclPtrTy();
4461 LookupQualifiedName(R, DC, Name, LookupOrdinaryName, true);
4462 PrevDecl = R.getAsSingleDecl(Context);
4464 // If searching in that context implicitly found a declaration in
4465 // a different context, treat it like it wasn't found at all.
4466 // TODO: better diagnostics for this case. Suggesting the right
4467 // qualified scope would be nice...
4468 if (!PrevDecl || !PrevDecl->getDeclContext()->Equals(DC)) {
4470 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T;
4474 // C++ [class.friend]p1: A friend of a class is a function or
4475 // class that is not a member of the class . . .
4476 if (DC->Equals(CurContext))
4477 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member);
4479 // Otherwise walk out to the nearest namespace scope looking for matches.
4481 // TODO: handle local class contexts.
4485 // Skip class contexts. If someone can cite chapter and verse
4486 // for this behavior, that would be nice --- it's what GCC and
4487 // EDG do, and it seems like a reasonable intent, but the spec
4488 // really only says that checks for unqualified existing
4489 // declarations should stop at the nearest enclosing namespace,
4490 // not that they should only consider the nearest enclosing
4492 while (DC->isRecord())
4493 DC = DC->getParent();
4496 LookupQualifiedName(R, DC, Name, LookupOrdinaryName, true);
4497 PrevDecl = R.getAsSingleDecl(Context);
4499 // TODO: decide what we think about using declarations.
4503 if (DC->isFileContext()) break;
4504 DC = DC->getParent();
4507 // C++ [class.friend]p1: A friend of a class is a function or
4508 // class that is not a member of the class . . .
4509 // C++0x changes this for both friend types and functions.
4510 // Most C++ 98 compilers do seem to give an error here, so
4512 if (PrevDecl && DC->Equals(CurContext) && !getLangOptions().CPlusPlus0x)
4513 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member);
4516 if (DC->isFileContext()) {
4517 // This implies that it has to be an operator or function.
4518 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ||
4519 D.getName().getKind() == UnqualifiedId::IK_DestructorName ||
4520 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) {
4521 Diag(Loc, diag::err_introducing_special_friend) <<
4522 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 :
4523 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2);
4528 bool Redeclaration = false;
4529 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, DInfo, PrevDecl,
4530 move(TemplateParams),
4533 if (!ND) return DeclPtrTy();
4535 assert(ND->getDeclContext() == DC);
4536 assert(ND->getLexicalDeclContext() == CurContext);
4538 // Add the function declaration to the appropriate lookup tables,
4539 // adjusting the redeclarations list as necessary. We don't
4540 // want to do this yet if the friending class is dependent.
4542 // Also update the scope-based lookup if the target context's
4543 // lookup context is in lexical scope.
4544 if (!CurContext->isDependentContext()) {
4545 DC = DC->getLookupContext();
4546 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false);
4547 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
4548 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false);
4551 FriendDecl *FrD = FriendDecl::Create(Context, CurContext,
4552 D.getIdentifierLoc(), ND,
4553 DS.getFriendSpecLoc());
4554 FrD->setAccess(AS_public);
4555 CurContext->addDecl(FrD);
4557 return DeclPtrTy::make(ND);
4560 void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) {
4561 AdjustDeclIfTemplate(dcl);
4563 Decl *Dcl = dcl.getAs<Decl>();
4564 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl);
4566 Diag(DelLoc, diag::err_deleted_non_function);
4569 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) {
4570 Diag(DelLoc, diag::err_deleted_decl_not_first);
4571 Diag(Prev->getLocation(), diag::note_previous_declaration);
4572 // If the declaration wasn't the first, we delete the function anyway for
4578 static void SearchForReturnInStmt(Sema &Self, Stmt *S) {
4579 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E;
4581 Stmt *SubStmt = *CI;
4584 if (isa<ReturnStmt>(SubStmt))
4585 Self.Diag(SubStmt->getSourceRange().getBegin(),
4586 diag::err_return_in_constructor_handler);
4587 if (!isa<Expr>(SubStmt))
4588 SearchForReturnInStmt(Self, SubStmt);
4592 void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) {
4593 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) {
4594 CXXCatchStmt *Handler = TryBlock->getHandler(I);
4595 SearchForReturnInStmt(*this, Handler);
4599 bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
4600 const CXXMethodDecl *Old) {
4601 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType();
4602 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType();
4604 QualType CNewTy = Context.getCanonicalType(NewTy);
4605 QualType COldTy = Context.getCanonicalType(OldTy);
4607 if (CNewTy == COldTy &&
4608 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers())
4611 // Check if the return types are covariant
4612 QualType NewClassTy, OldClassTy;
4614 /// Both types must be pointers or references to classes.
4615 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) {
4616 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) {
4617 NewClassTy = NewPT->getPointeeType();
4618 OldClassTy = OldPT->getPointeeType();
4620 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) {
4621 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) {
4622 NewClassTy = NewRT->getPointeeType();
4623 OldClassTy = OldRT->getPointeeType();
4627 // The return types aren't either both pointers or references to a class type.
4628 if (NewClassTy.isNull()) {
4629 Diag(New->getLocation(),
4630 diag::err_different_return_type_for_overriding_virtual_function)
4631 << New->getDeclName() << NewTy << OldTy;
4632 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
4637 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) {
4638 // Check if the new class derives from the old class.
4639 if (!IsDerivedFrom(NewClassTy, OldClassTy)) {
4640 Diag(New->getLocation(),
4641 diag::err_covariant_return_not_derived)
4642 << New->getDeclName() << NewTy << OldTy;
4643 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
4647 // Check if we the conversion from derived to base is valid.
4648 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy,
4649 diag::err_covariant_return_inaccessible_base,
4650 diag::err_covariant_return_ambiguous_derived_to_base_conv,
4651 // FIXME: Should this point to the return type?
4652 New->getLocation(), SourceRange(), New->getDeclName())) {
4653 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
4658 // The qualifiers of the return types must be the same.
4659 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) {
4660 Diag(New->getLocation(),
4661 diag::err_covariant_return_type_different_qualifications)
4662 << New->getDeclName() << NewTy << OldTy;
4663 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
4668 // The new class type must have the same or less qualifiers as the old type.
4669 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) {
4670 Diag(New->getLocation(),
4671 diag::err_covariant_return_type_class_type_more_qualified)
4672 << New->getDeclName() << NewTy << OldTy;
4673 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
4680 /// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an
4681 /// initializer for the declaration 'Dcl'.
4682 /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
4683 /// static data member of class X, names should be looked up in the scope of
4685 void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) {
4686 AdjustDeclIfTemplate(Dcl);
4688 Decl *D = Dcl.getAs<Decl>();
4689 // If there is no declaration, there was an error parsing it.
4693 // Check whether it is a declaration with a nested name specifier like
4695 if (!D->isOutOfLine())
4698 // C++ [basic.lookup.unqual]p13
4700 // A name used in the definition of a static data member of class X
4701 // (after the qualified-id of the static member) is looked up as if the name
4702 // was used in a member function of X.
4704 // Change current context into the context of the initializing declaration.
4705 EnterDeclaratorContext(S, D->getDeclContext());
4708 /// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an
4709 /// initializer for the declaration 'Dcl'.
4710 void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) {
4711 AdjustDeclIfTemplate(Dcl);
4713 Decl *D = Dcl.getAs<Decl>();
4714 // If there is no declaration, there was an error parsing it.
4718 // Check whether it is a declaration with a nested name specifier like
4720 if (!D->isOutOfLine())
4723 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!");
4724 ExitDeclaratorContext(S);