1 //===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements semantic analysis for C++ declarations.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Sema/SemaInternal.h"
15 #include "clang/AST/ASTConsumer.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/ASTLambda.h"
18 #include "clang/AST/ASTMutationListener.h"
19 #include "clang/AST/CXXInheritance.h"
20 #include "clang/AST/CharUnits.h"
21 #include "clang/AST/EvaluatedExprVisitor.h"
22 #include "clang/AST/ExprCXX.h"
23 #include "clang/AST/RecordLayout.h"
24 #include "clang/AST/RecursiveASTVisitor.h"
25 #include "clang/AST/StmtVisitor.h"
26 #include "clang/AST/TypeLoc.h"
27 #include "clang/AST/TypeOrdering.h"
28 #include "clang/Basic/PartialDiagnostic.h"
29 #include "clang/Basic/TargetInfo.h"
30 #include "clang/Lex/LiteralSupport.h"
31 #include "clang/Lex/Preprocessor.h"
32 #include "clang/Sema/CXXFieldCollector.h"
33 #include "clang/Sema/DeclSpec.h"
34 #include "clang/Sema/Initialization.h"
35 #include "clang/Sema/Lookup.h"
36 #include "clang/Sema/ParsedTemplate.h"
37 #include "clang/Sema/Scope.h"
38 #include "clang/Sema/ScopeInfo.h"
39 #include "clang/Sema/Template.h"
40 #include "llvm/ADT/STLExtras.h"
41 #include "llvm/ADT/SmallString.h"
45 using namespace clang;
47 //===----------------------------------------------------------------------===//
48 // CheckDefaultArgumentVisitor
49 //===----------------------------------------------------------------------===//
52 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses
53 /// the default argument of a parameter to determine whether it
54 /// contains any ill-formed subexpressions. For example, this will
55 /// diagnose the use of local variables or parameters within the
56 /// default argument expression.
57 class CheckDefaultArgumentVisitor
58 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> {
63 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
64 : DefaultArg(defarg), S(s) {}
66 bool VisitExpr(Expr *Node);
67 bool VisitDeclRefExpr(DeclRefExpr *DRE);
68 bool VisitCXXThisExpr(CXXThisExpr *ThisE);
69 bool VisitLambdaExpr(LambdaExpr *Lambda);
70 bool VisitPseudoObjectExpr(PseudoObjectExpr *POE);
73 /// VisitExpr - Visit all of the children of this expression.
74 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) {
75 bool IsInvalid = false;
76 for (Stmt *SubStmt : Node->children())
77 IsInvalid |= Visit(SubStmt);
81 /// VisitDeclRefExpr - Visit a reference to a declaration, to
82 /// determine whether this declaration can be used in the default
83 /// argument expression.
84 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) {
85 NamedDecl *Decl = DRE->getDecl();
86 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) {
87 // C++ [dcl.fct.default]p9
88 // Default arguments are evaluated each time the function is
89 // called. The order of evaluation of function arguments is
90 // unspecified. Consequently, parameters of a function shall not
91 // be used in default argument expressions, even if they are not
92 // evaluated. Parameters of a function declared before a default
93 // argument expression are in scope and can hide namespace and
94 // class member names.
95 return S->Diag(DRE->getLocStart(),
96 diag::err_param_default_argument_references_param)
97 << Param->getDeclName() << DefaultArg->getSourceRange();
98 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) {
99 // C++ [dcl.fct.default]p7
100 // Local variables shall not be used in default argument
102 if (VDecl->isLocalVarDecl())
103 return S->Diag(DRE->getLocStart(),
104 diag::err_param_default_argument_references_local)
105 << VDecl->getDeclName() << DefaultArg->getSourceRange();
111 /// VisitCXXThisExpr - Visit a C++ "this" expression.
112 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) {
113 // C++ [dcl.fct.default]p8:
114 // The keyword this shall not be used in a default argument of a
116 return S->Diag(ThisE->getLocStart(),
117 diag::err_param_default_argument_references_this)
118 << ThisE->getSourceRange();
121 bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr(PseudoObjectExpr *POE) {
122 bool Invalid = false;
123 for (PseudoObjectExpr::semantics_iterator
124 i = POE->semantics_begin(), e = POE->semantics_end(); i != e; ++i) {
127 // Look through bindings.
128 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) {
129 E = OVE->getSourceExpr();
130 assert(E && "pseudo-object binding without source expression?");
138 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) {
139 // C++11 [expr.lambda.prim]p13:
140 // A lambda-expression appearing in a default argument shall not
141 // implicitly or explicitly capture any entity.
142 if (Lambda->capture_begin() == Lambda->capture_end())
145 return S->Diag(Lambda->getLocStart(),
146 diag::err_lambda_capture_default_arg);
151 Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc,
152 const CXXMethodDecl *Method) {
153 // If we have an MSAny spec already, don't bother.
154 if (!Method || ComputedEST == EST_MSAny)
157 const FunctionProtoType *Proto
158 = Method->getType()->getAs<FunctionProtoType>();
159 Proto = Self->ResolveExceptionSpec(CallLoc, Proto);
163 ExceptionSpecificationType EST = Proto->getExceptionSpecType();
165 // If we have a throw-all spec at this point, ignore the function.
166 if (ComputedEST == EST_None)
170 // If this function can throw any exceptions, make a note of that.
176 // FIXME: If the call to this decl is using any of its default arguments, we
177 // need to search them for potentially-throwing calls.
178 // If this function has a basic noexcept, it doesn't affect the outcome.
179 case EST_BasicNoexcept:
181 // If we're still at noexcept(true) and there's a nothrow() callee,
182 // change to that specification.
183 case EST_DynamicNone:
184 if (ComputedEST == EST_BasicNoexcept)
185 ComputedEST = EST_DynamicNone;
187 // Check out noexcept specs.
188 case EST_ComputedNoexcept:
190 FunctionProtoType::NoexceptResult NR =
191 Proto->getNoexceptSpec(Self->Context);
192 assert(NR != FunctionProtoType::NR_NoNoexcept &&
193 "Must have noexcept result for EST_ComputedNoexcept.");
194 assert(NR != FunctionProtoType::NR_Dependent &&
195 "Should not generate implicit declarations for dependent cases, "
196 "and don't know how to handle them anyway.");
197 // noexcept(false) -> no spec on the new function
198 if (NR == FunctionProtoType::NR_Throw) {
200 ComputedEST = EST_None;
202 // noexcept(true) won't change anything either.
208 assert(EST == EST_Dynamic && "EST case not considered earlier.");
209 assert(ComputedEST != EST_None &&
210 "Shouldn't collect exceptions when throw-all is guaranteed.");
211 ComputedEST = EST_Dynamic;
212 // Record the exceptions in this function's exception specification.
213 for (const auto &E : Proto->exceptions())
214 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(E)).second)
215 Exceptions.push_back(E);
218 void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) {
219 if (!E || ComputedEST == EST_MSAny)
224 // C++0x [except.spec]p14:
225 // [An] implicit exception-specification specifies the type-id T if and
226 // only if T is allowed by the exception-specification of a function directly
227 // invoked by f's implicit definition; f shall allow all exceptions if any
228 // function it directly invokes allows all exceptions, and f shall allow no
229 // exceptions if every function it directly invokes allows no exceptions.
231 // Note in particular that if an implicit exception-specification is generated
232 // for a function containing a throw-expression, that specification can still
233 // be noexcept(true).
235 // Note also that 'directly invoked' is not defined in the standard, and there
236 // is no indication that we should only consider potentially-evaluated calls.
238 // Ultimately we should implement the intent of the standard: the exception
239 // specification should be the set of exceptions which can be thrown by the
240 // implicit definition. For now, we assume that any non-nothrow expression can
241 // throw any exception.
243 if (Self->canThrow(E))
244 ComputedEST = EST_None;
248 Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg,
249 SourceLocation EqualLoc) {
250 if (RequireCompleteType(Param->getLocation(), Param->getType(),
251 diag::err_typecheck_decl_incomplete_type)) {
252 Param->setInvalidDecl();
256 // C++ [dcl.fct.default]p5
257 // A default argument expression is implicitly converted (clause
258 // 4) to the parameter type. The default argument expression has
259 // the same semantic constraints as the initializer expression in
260 // a declaration of a variable of the parameter type, using the
261 // copy-initialization semantics (8.5).
262 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
264 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(),
266 InitializationSequence InitSeq(*this, Entity, Kind, Arg);
267 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg);
268 if (Result.isInvalid())
270 Arg = Result.getAs<Expr>();
272 CheckCompletedExpr(Arg, EqualLoc);
273 Arg = MaybeCreateExprWithCleanups(Arg);
275 // Okay: add the default argument to the parameter
276 Param->setDefaultArg(Arg);
278 // We have already instantiated this parameter; provide each of the
279 // instantiations with the uninstantiated default argument.
280 UnparsedDefaultArgInstantiationsMap::iterator InstPos
281 = UnparsedDefaultArgInstantiations.find(Param);
282 if (InstPos != UnparsedDefaultArgInstantiations.end()) {
283 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I)
284 InstPos->second[I]->setUninstantiatedDefaultArg(Arg);
286 // We're done tracking this parameter's instantiations.
287 UnparsedDefaultArgInstantiations.erase(InstPos);
293 /// ActOnParamDefaultArgument - Check whether the default argument
294 /// provided for a function parameter is well-formed. If so, attach it
295 /// to the parameter declaration.
297 Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc,
299 if (!param || !DefaultArg)
302 ParmVarDecl *Param = cast<ParmVarDecl>(param);
303 UnparsedDefaultArgLocs.erase(Param);
305 // Default arguments are only permitted in C++
306 if (!getLangOpts().CPlusPlus) {
307 Diag(EqualLoc, diag::err_param_default_argument)
308 << DefaultArg->getSourceRange();
309 Param->setInvalidDecl();
313 // Check for unexpanded parameter packs.
314 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) {
315 Param->setInvalidDecl();
319 // C++11 [dcl.fct.default]p3
320 // A default argument expression [...] shall not be specified for a
322 if (Param->isParameterPack()) {
323 Diag(EqualLoc, diag::err_param_default_argument_on_parameter_pack)
324 << DefaultArg->getSourceRange();
328 // Check that the default argument is well-formed
329 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this);
330 if (DefaultArgChecker.Visit(DefaultArg)) {
331 Param->setInvalidDecl();
335 SetParamDefaultArgument(Param, DefaultArg, EqualLoc);
338 /// ActOnParamUnparsedDefaultArgument - We've seen a default
339 /// argument for a function parameter, but we can't parse it yet
340 /// because we're inside a class definition. Note that this default
341 /// argument will be parsed later.
342 void Sema::ActOnParamUnparsedDefaultArgument(Decl *param,
343 SourceLocation EqualLoc,
344 SourceLocation ArgLoc) {
348 ParmVarDecl *Param = cast<ParmVarDecl>(param);
349 Param->setUnparsedDefaultArg();
350 UnparsedDefaultArgLocs[Param] = ArgLoc;
353 /// ActOnParamDefaultArgumentError - Parsing or semantic analysis of
354 /// the default argument for the parameter param failed.
355 void Sema::ActOnParamDefaultArgumentError(Decl *param,
356 SourceLocation EqualLoc) {
360 ParmVarDecl *Param = cast<ParmVarDecl>(param);
361 Param->setInvalidDecl();
362 UnparsedDefaultArgLocs.erase(Param);
363 Param->setDefaultArg(new(Context)
364 OpaqueValueExpr(EqualLoc,
365 Param->getType().getNonReferenceType(),
369 /// CheckExtraCXXDefaultArguments - Check for any extra default
370 /// arguments in the declarator, which is not a function declaration
371 /// or definition and therefore is not permitted to have default
372 /// arguments. This routine should be invoked for every declarator
373 /// that is not a function declaration or definition.
374 void Sema::CheckExtraCXXDefaultArguments(Declarator &D) {
375 // C++ [dcl.fct.default]p3
376 // A default argument expression shall be specified only in the
377 // parameter-declaration-clause of a function declaration or in a
378 // template-parameter (14.1). It shall not be specified for a
379 // parameter pack. If it is specified in a
380 // parameter-declaration-clause, it shall not occur within a
381 // declarator or abstract-declarator of a parameter-declaration.
382 bool MightBeFunction = D.isFunctionDeclarationContext();
383 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
384 DeclaratorChunk &chunk = D.getTypeObject(i);
385 if (chunk.Kind == DeclaratorChunk::Function) {
386 if (MightBeFunction) {
387 // This is a function declaration. It can have default arguments, but
388 // keep looking in case its return type is a function type with default
390 MightBeFunction = false;
393 for (unsigned argIdx = 0, e = chunk.Fun.NumParams; argIdx != e;
395 ParmVarDecl *Param = cast<ParmVarDecl>(chunk.Fun.Params[argIdx].Param);
396 if (Param->hasUnparsedDefaultArg()) {
397 CachedTokens *Toks = chunk.Fun.Params[argIdx].DefaultArgTokens;
399 if (Toks->size() > 1)
400 SR = SourceRange((*Toks)[1].getLocation(),
401 Toks->back().getLocation());
403 SR = UnparsedDefaultArgLocs[Param];
404 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
407 chunk.Fun.Params[argIdx].DefaultArgTokens = nullptr;
408 } else if (Param->getDefaultArg()) {
409 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
410 << Param->getDefaultArg()->getSourceRange();
411 Param->setDefaultArg(nullptr);
414 } else if (chunk.Kind != DeclaratorChunk::Paren) {
415 MightBeFunction = false;
420 static bool functionDeclHasDefaultArgument(const FunctionDecl *FD) {
421 for (unsigned NumParams = FD->getNumParams(); NumParams > 0; --NumParams) {
422 const ParmVarDecl *PVD = FD->getParamDecl(NumParams-1);
423 if (!PVD->hasDefaultArg())
425 if (!PVD->hasInheritedDefaultArg())
431 /// MergeCXXFunctionDecl - Merge two declarations of the same C++
432 /// function, once we already know that they have the same
433 /// type. Subroutine of MergeFunctionDecl. Returns true if there was an
434 /// error, false otherwise.
435 bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old,
437 bool Invalid = false;
439 // The declaration context corresponding to the scope is the semantic
440 // parent, unless this is a local function declaration, in which case
441 // it is that surrounding function.
442 DeclContext *ScopeDC = New->isLocalExternDecl()
443 ? New->getLexicalDeclContext()
444 : New->getDeclContext();
446 // Find the previous declaration for the purpose of default arguments.
447 FunctionDecl *PrevForDefaultArgs = Old;
448 for (/**/; PrevForDefaultArgs;
449 // Don't bother looking back past the latest decl if this is a local
450 // extern declaration; nothing else could work.
451 PrevForDefaultArgs = New->isLocalExternDecl()
453 : PrevForDefaultArgs->getPreviousDecl()) {
454 // Ignore hidden declarations.
455 if (!LookupResult::isVisible(*this, PrevForDefaultArgs))
458 if (S && !isDeclInScope(PrevForDefaultArgs, ScopeDC, S) &&
459 !New->isCXXClassMember()) {
460 // Ignore default arguments of old decl if they are not in
461 // the same scope and this is not an out-of-line definition of
462 // a member function.
466 if (PrevForDefaultArgs->isLocalExternDecl() != New->isLocalExternDecl()) {
467 // If only one of these is a local function declaration, then they are
468 // declared in different scopes, even though isDeclInScope may think
469 // they're in the same scope. (If both are local, the scope check is
470 // sufficent, and if neither is local, then they are in the same scope.)
474 // We found the right previous declaration.
478 // C++ [dcl.fct.default]p4:
479 // For non-template functions, default arguments can be added in
480 // later declarations of a function in the same
481 // scope. Declarations in different scopes have completely
482 // distinct sets of default arguments. That is, declarations in
483 // inner scopes do not acquire default arguments from
484 // declarations in outer scopes, and vice versa. In a given
485 // function declaration, all parameters subsequent to a
486 // parameter with a default argument shall have default
487 // arguments supplied in this or previous declarations. A
488 // default argument shall not be redefined by a later
489 // declaration (not even to the same value).
491 // C++ [dcl.fct.default]p6:
492 // Except for member functions of class templates, the default arguments
493 // in a member function definition that appears outside of the class
494 // definition are added to the set of default arguments provided by the
495 // member function declaration in the class definition.
496 for (unsigned p = 0, NumParams = PrevForDefaultArgs
497 ? PrevForDefaultArgs->getNumParams()
499 p < NumParams; ++p) {
500 ParmVarDecl *OldParam = PrevForDefaultArgs->getParamDecl(p);
501 ParmVarDecl *NewParam = New->getParamDecl(p);
503 bool OldParamHasDfl = OldParam ? OldParam->hasDefaultArg() : false;
504 bool NewParamHasDfl = NewParam->hasDefaultArg();
506 if (OldParamHasDfl && NewParamHasDfl) {
507 unsigned DiagDefaultParamID =
508 diag::err_param_default_argument_redefinition;
510 // MSVC accepts that default parameters be redefined for member functions
511 // of template class. The new default parameter's value is ignored.
513 if (getLangOpts().MicrosoftExt) {
514 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(New);
515 if (MD && MD->getParent()->getDescribedClassTemplate()) {
516 // Merge the old default argument into the new parameter.
517 NewParam->setHasInheritedDefaultArg();
518 if (OldParam->hasUninstantiatedDefaultArg())
519 NewParam->setUninstantiatedDefaultArg(
520 OldParam->getUninstantiatedDefaultArg());
522 NewParam->setDefaultArg(OldParam->getInit());
523 DiagDefaultParamID = diag::ext_param_default_argument_redefinition;
528 // FIXME: If we knew where the '=' was, we could easily provide a fix-it
529 // hint here. Alternatively, we could walk the type-source information
530 // for NewParam to find the last source location in the type... but it
531 // isn't worth the effort right now. This is the kind of test case that
532 // is hard to get right:
534 // void g(int (*fp)(int) = f);
535 // void g(int (*fp)(int) = &f);
536 Diag(NewParam->getLocation(), DiagDefaultParamID)
537 << NewParam->getDefaultArgRange();
539 // Look for the function declaration where the default argument was
540 // actually written, which may be a declaration prior to Old.
541 for (auto Older = PrevForDefaultArgs;
542 OldParam->hasInheritedDefaultArg(); /**/) {
543 Older = Older->getPreviousDecl();
544 OldParam = Older->getParamDecl(p);
547 Diag(OldParam->getLocation(), diag::note_previous_definition)
548 << OldParam->getDefaultArgRange();
549 } else if (OldParamHasDfl) {
550 // Merge the old default argument into the new parameter.
551 // It's important to use getInit() here; getDefaultArg()
552 // strips off any top-level ExprWithCleanups.
553 NewParam->setHasInheritedDefaultArg();
554 if (OldParam->hasUnparsedDefaultArg())
555 NewParam->setUnparsedDefaultArg();
556 else if (OldParam->hasUninstantiatedDefaultArg())
557 NewParam->setUninstantiatedDefaultArg(
558 OldParam->getUninstantiatedDefaultArg());
560 NewParam->setDefaultArg(OldParam->getInit());
561 } else if (NewParamHasDfl) {
562 if (New->getDescribedFunctionTemplate()) {
563 // Paragraph 4, quoted above, only applies to non-template functions.
564 Diag(NewParam->getLocation(),
565 diag::err_param_default_argument_template_redecl)
566 << NewParam->getDefaultArgRange();
567 Diag(PrevForDefaultArgs->getLocation(),
568 diag::note_template_prev_declaration)
570 } else if (New->getTemplateSpecializationKind()
571 != TSK_ImplicitInstantiation &&
572 New->getTemplateSpecializationKind() != TSK_Undeclared) {
573 // C++ [temp.expr.spec]p21:
574 // Default function arguments shall not be specified in a declaration
575 // or a definition for one of the following explicit specializations:
576 // - the explicit specialization of a function template;
577 // - the explicit specialization of a member function template;
578 // - the explicit specialization of a member function of a class
579 // template where the class template specialization to which the
580 // member function specialization belongs is implicitly
582 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg)
583 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization)
584 << New->getDeclName()
585 << NewParam->getDefaultArgRange();
586 } else if (New->getDeclContext()->isDependentContext()) {
587 // C++ [dcl.fct.default]p6 (DR217):
588 // Default arguments for a member function of a class template shall
589 // be specified on the initial declaration of the member function
590 // within the class template.
592 // Reading the tea leaves a bit in DR217 and its reference to DR205
593 // leads me to the conclusion that one cannot add default function
594 // arguments for an out-of-line definition of a member function of a
597 if (CXXRecordDecl *Record
598 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) {
599 if (Record->getDescribedClassTemplate())
601 else if (isa<ClassTemplatePartialSpecializationDecl>(Record))
607 Diag(NewParam->getLocation(),
608 diag::err_param_default_argument_member_template_redecl)
610 << NewParam->getDefaultArgRange();
615 // DR1344: If a default argument is added outside a class definition and that
616 // default argument makes the function a special member function, the program
617 // is ill-formed. This can only happen for constructors.
618 if (isa<CXXConstructorDecl>(New) &&
619 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) {
620 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)),
621 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old));
622 if (NewSM != OldSM) {
623 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments());
624 assert(NewParam->hasDefaultArg());
625 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special)
626 << NewParam->getDefaultArgRange() << NewSM;
627 Diag(Old->getLocation(), diag::note_previous_declaration);
631 const FunctionDecl *Def;
632 // C++11 [dcl.constexpr]p1: If any declaration of a function or function
633 // template has a constexpr specifier then all its declarations shall
634 // contain the constexpr specifier.
635 if (New->isConstexpr() != Old->isConstexpr()) {
636 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch)
637 << New << New->isConstexpr();
638 Diag(Old->getLocation(), diag::note_previous_declaration);
640 } else if (!Old->getMostRecentDecl()->isInlined() && New->isInlined() &&
641 Old->isDefined(Def)) {
642 // C++11 [dcl.fcn.spec]p4:
643 // If the definition of a function appears in a translation unit before its
644 // first declaration as inline, the program is ill-formed.
645 Diag(New->getLocation(), diag::err_inline_decl_follows_def) << New;
646 Diag(Def->getLocation(), diag::note_previous_definition);
650 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a default
651 // argument expression, that declaration shall be a definition and shall be
652 // the only declaration of the function or function template in the
654 if (Old->getFriendObjectKind() == Decl::FOK_Undeclared &&
655 functionDeclHasDefaultArgument(Old)) {
656 Diag(New->getLocation(), diag::err_friend_decl_with_def_arg_redeclared);
657 Diag(Old->getLocation(), diag::note_previous_declaration);
661 if (CheckEquivalentExceptionSpec(Old, New))
667 /// \brief Merge the exception specifications of two variable declarations.
669 /// This is called when there's a redeclaration of a VarDecl. The function
670 /// checks if the redeclaration might have an exception specification and
671 /// validates compatibility and merges the specs if necessary.
672 void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) {
673 // Shortcut if exceptions are disabled.
674 if (!getLangOpts().CXXExceptions)
677 assert(Context.hasSameType(New->getType(), Old->getType()) &&
678 "Should only be called if types are otherwise the same.");
680 QualType NewType = New->getType();
681 QualType OldType = Old->getType();
683 // We're only interested in pointers and references to functions, as well
684 // as pointers to member functions.
685 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) {
686 NewType = R->getPointeeType();
687 OldType = OldType->getAs<ReferenceType>()->getPointeeType();
688 } else if (const PointerType *P = NewType->getAs<PointerType>()) {
689 NewType = P->getPointeeType();
690 OldType = OldType->getAs<PointerType>()->getPointeeType();
691 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) {
692 NewType = M->getPointeeType();
693 OldType = OldType->getAs<MemberPointerType>()->getPointeeType();
696 if (!NewType->isFunctionProtoType())
699 // There's lots of special cases for functions. For function pointers, system
700 // libraries are hopefully not as broken so that we don't need these
702 if (CheckEquivalentExceptionSpec(
703 OldType->getAs<FunctionProtoType>(), Old->getLocation(),
704 NewType->getAs<FunctionProtoType>(), New->getLocation())) {
705 New->setInvalidDecl();
709 /// CheckCXXDefaultArguments - Verify that the default arguments for a
710 /// function declaration are well-formed according to C++
711 /// [dcl.fct.default].
712 void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) {
713 unsigned NumParams = FD->getNumParams();
716 // Find first parameter with a default argument
717 for (p = 0; p < NumParams; ++p) {
718 ParmVarDecl *Param = FD->getParamDecl(p);
719 if (Param->hasDefaultArg())
723 // C++11 [dcl.fct.default]p4:
724 // In a given function declaration, each parameter subsequent to a parameter
725 // with a default argument shall have a default argument supplied in this or
726 // a previous declaration or shall be a function parameter pack. A default
727 // argument shall not be redefined by a later declaration (not even to the
729 unsigned LastMissingDefaultArg = 0;
730 for (; p < NumParams; ++p) {
731 ParmVarDecl *Param = FD->getParamDecl(p);
732 if (!Param->hasDefaultArg() && !Param->isParameterPack()) {
733 if (Param->isInvalidDecl())
734 /* We already complained about this parameter. */;
735 else if (Param->getIdentifier())
736 Diag(Param->getLocation(),
737 diag::err_param_default_argument_missing_name)
738 << Param->getIdentifier();
740 Diag(Param->getLocation(),
741 diag::err_param_default_argument_missing);
743 LastMissingDefaultArg = p;
747 if (LastMissingDefaultArg > 0) {
748 // Some default arguments were missing. Clear out all of the
749 // default arguments up to (and including) the last missing
750 // default argument, so that we leave the function parameters
751 // in a semantically valid state.
752 for (p = 0; p <= LastMissingDefaultArg; ++p) {
753 ParmVarDecl *Param = FD->getParamDecl(p);
754 if (Param->hasDefaultArg()) {
755 Param->setDefaultArg(nullptr);
761 // CheckConstexprParameterTypes - Check whether a function's parameter types
762 // are all literal types. If so, return true. If not, produce a suitable
763 // diagnostic and return false.
764 static bool CheckConstexprParameterTypes(Sema &SemaRef,
765 const FunctionDecl *FD) {
766 unsigned ArgIndex = 0;
767 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>();
768 for (FunctionProtoType::param_type_iterator i = FT->param_type_begin(),
769 e = FT->param_type_end();
770 i != e; ++i, ++ArgIndex) {
771 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex);
772 SourceLocation ParamLoc = PD->getLocation();
773 if (!(*i)->isDependentType() &&
774 SemaRef.RequireLiteralType(ParamLoc, *i,
775 diag::err_constexpr_non_literal_param,
776 ArgIndex+1, PD->getSourceRange(),
777 isa<CXXConstructorDecl>(FD)))
783 /// \brief Get diagnostic %select index for tag kind for
784 /// record diagnostic message.
785 /// WARNING: Indexes apply to particular diagnostics only!
787 /// \returns diagnostic %select index.
788 static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) {
790 case TTK_Struct: return 0;
791 case TTK_Interface: return 1;
792 case TTK_Class: return 2;
793 default: llvm_unreachable("Invalid tag kind for record diagnostic!");
797 // CheckConstexprFunctionDecl - Check whether a function declaration satisfies
798 // the requirements of a constexpr function definition or a constexpr
799 // constructor definition. If so, return true. If not, produce appropriate
800 // diagnostics and return false.
802 // This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360.
803 bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) {
804 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
805 if (MD && MD->isInstance()) {
806 // C++11 [dcl.constexpr]p4:
807 // The definition of a constexpr constructor shall satisfy the following
809 // - the class shall not have any virtual base classes;
810 const CXXRecordDecl *RD = MD->getParent();
811 if (RD->getNumVBases()) {
812 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base)
813 << isa<CXXConstructorDecl>(NewFD)
814 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases();
815 for (const auto &I : RD->vbases())
816 Diag(I.getLocStart(),
817 diag::note_constexpr_virtual_base_here) << I.getSourceRange();
822 if (!isa<CXXConstructorDecl>(NewFD)) {
823 // C++11 [dcl.constexpr]p3:
824 // The definition of a constexpr function shall satisfy the following
826 // - it shall not be virtual;
827 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD);
828 if (Method && Method->isVirtual()) {
829 Method = Method->getCanonicalDecl();
830 Diag(Method->getLocation(), diag::err_constexpr_virtual);
832 // If it's not obvious why this function is virtual, find an overridden
833 // function which uses the 'virtual' keyword.
834 const CXXMethodDecl *WrittenVirtual = Method;
835 while (!WrittenVirtual->isVirtualAsWritten())
836 WrittenVirtual = *WrittenVirtual->begin_overridden_methods();
837 if (WrittenVirtual != Method)
838 Diag(WrittenVirtual->getLocation(),
839 diag::note_overridden_virtual_function);
843 // - its return type shall be a literal type;
844 QualType RT = NewFD->getReturnType();
845 if (!RT->isDependentType() &&
846 RequireLiteralType(NewFD->getLocation(), RT,
847 diag::err_constexpr_non_literal_return))
851 // - each of its parameter types shall be a literal type;
852 if (!CheckConstexprParameterTypes(*this, NewFD))
858 /// Check the given declaration statement is legal within a constexpr function
859 /// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3.
861 /// \return true if the body is OK (maybe only as an extension), false if we
862 /// have diagnosed a problem.
863 static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl,
864 DeclStmt *DS, SourceLocation &Cxx1yLoc) {
865 // C++11 [dcl.constexpr]p3 and p4:
866 // The definition of a constexpr function(p3) or constructor(p4) [...] shall
868 for (const auto *DclIt : DS->decls()) {
869 switch (DclIt->getKind()) {
870 case Decl::StaticAssert:
872 case Decl::UsingShadow:
873 case Decl::UsingDirective:
874 case Decl::UnresolvedUsingTypename:
875 case Decl::UnresolvedUsingValue:
876 // - static_assert-declarations
877 // - using-declarations,
878 // - using-directives,
882 case Decl::TypeAlias: {
883 // - typedef declarations and alias-declarations that do not define
884 // classes or enumerations,
885 const auto *TN = cast<TypedefNameDecl>(DclIt);
886 if (TN->getUnderlyingType()->isVariablyModifiedType()) {
887 // Don't allow variably-modified types in constexpr functions.
888 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc();
889 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla)
890 << TL.getSourceRange() << TL.getType()
891 << isa<CXXConstructorDecl>(Dcl);
898 case Decl::CXXRecord:
899 // C++1y allows types to be defined, not just declared.
900 if (cast<TagDecl>(DclIt)->isThisDeclarationADefinition())
901 SemaRef.Diag(DS->getLocStart(),
902 SemaRef.getLangOpts().CPlusPlus14
903 ? diag::warn_cxx11_compat_constexpr_type_definition
904 : diag::ext_constexpr_type_definition)
905 << isa<CXXConstructorDecl>(Dcl);
908 case Decl::EnumConstant:
909 case Decl::IndirectField:
911 // These can only appear with other declarations which are banned in
912 // C++11 and permitted in C++1y, so ignore them.
916 // C++1y [dcl.constexpr]p3 allows anything except:
917 // a definition of a variable of non-literal type or of static or
918 // thread storage duration or for which no initialization is performed.
919 const auto *VD = cast<VarDecl>(DclIt);
920 if (VD->isThisDeclarationADefinition()) {
921 if (VD->isStaticLocal()) {
922 SemaRef.Diag(VD->getLocation(),
923 diag::err_constexpr_local_var_static)
924 << isa<CXXConstructorDecl>(Dcl)
925 << (VD->getTLSKind() == VarDecl::TLS_Dynamic);
928 if (!VD->getType()->isDependentType() &&
929 SemaRef.RequireLiteralType(
930 VD->getLocation(), VD->getType(),
931 diag::err_constexpr_local_var_non_literal_type,
932 isa<CXXConstructorDecl>(Dcl)))
934 if (!VD->getType()->isDependentType() &&
935 !VD->hasInit() && !VD->isCXXForRangeDecl()) {
936 SemaRef.Diag(VD->getLocation(),
937 diag::err_constexpr_local_var_no_init)
938 << isa<CXXConstructorDecl>(Dcl);
942 SemaRef.Diag(VD->getLocation(),
943 SemaRef.getLangOpts().CPlusPlus14
944 ? diag::warn_cxx11_compat_constexpr_local_var
945 : diag::ext_constexpr_local_var)
946 << isa<CXXConstructorDecl>(Dcl);
950 case Decl::NamespaceAlias:
952 // These are disallowed in C++11 and permitted in C++1y. Allow them
953 // everywhere as an extension.
954 if (!Cxx1yLoc.isValid())
955 Cxx1yLoc = DS->getLocStart();
959 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt)
960 << isa<CXXConstructorDecl>(Dcl);
968 /// Check that the given field is initialized within a constexpr constructor.
970 /// \param Dcl The constexpr constructor being checked.
971 /// \param Field The field being checked. This may be a member of an anonymous
972 /// struct or union nested within the class being checked.
973 /// \param Inits All declarations, including anonymous struct/union members and
974 /// indirect members, for which any initialization was provided.
975 /// \param Diagnosed Set to true if an error is produced.
976 static void CheckConstexprCtorInitializer(Sema &SemaRef,
977 const FunctionDecl *Dcl,
979 llvm::SmallSet<Decl*, 16> &Inits,
981 if (Field->isInvalidDecl())
984 if (Field->isUnnamedBitfield())
987 // Anonymous unions with no variant members and empty anonymous structs do not
988 // need to be explicitly initialized. FIXME: Anonymous structs that contain no
989 // indirect fields don't need initializing.
990 if (Field->isAnonymousStructOrUnion() &&
991 (Field->getType()->isUnionType()
992 ? !Field->getType()->getAsCXXRecordDecl()->hasVariantMembers()
993 : Field->getType()->getAsCXXRecordDecl()->isEmpty()))
996 if (!Inits.count(Field)) {
998 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init);
1001 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init);
1002 } else if (Field->isAnonymousStructOrUnion()) {
1003 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl();
1004 for (auto *I : RD->fields())
1005 // If an anonymous union contains an anonymous struct of which any member
1006 // is initialized, all members must be initialized.
1007 if (!RD->isUnion() || Inits.count(I))
1008 CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed);
1012 /// Check the provided statement is allowed in a constexpr function
1015 CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S,
1016 SmallVectorImpl<SourceLocation> &ReturnStmts,
1017 SourceLocation &Cxx1yLoc) {
1018 // - its function-body shall be [...] a compound-statement that contains only
1019 switch (S->getStmtClass()) {
1020 case Stmt::NullStmtClass:
1021 // - null statements,
1024 case Stmt::DeclStmtClass:
1025 // - static_assert-declarations
1026 // - using-declarations,
1027 // - using-directives,
1028 // - typedef declarations and alias-declarations that do not define
1029 // classes or enumerations,
1030 if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc))
1034 case Stmt::ReturnStmtClass:
1035 // - and exactly one return statement;
1036 if (isa<CXXConstructorDecl>(Dcl)) {
1037 // C++1y allows return statements in constexpr constructors.
1038 if (!Cxx1yLoc.isValid())
1039 Cxx1yLoc = S->getLocStart();
1043 ReturnStmts.push_back(S->getLocStart());
1046 case Stmt::CompoundStmtClass: {
1047 // C++1y allows compound-statements.
1048 if (!Cxx1yLoc.isValid())
1049 Cxx1yLoc = S->getLocStart();
1051 CompoundStmt *CompStmt = cast<CompoundStmt>(S);
1052 for (auto *BodyIt : CompStmt->body()) {
1053 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, BodyIt, ReturnStmts,
1060 case Stmt::AttributedStmtClass:
1061 if (!Cxx1yLoc.isValid())
1062 Cxx1yLoc = S->getLocStart();
1065 case Stmt::IfStmtClass: {
1066 // C++1y allows if-statements.
1067 if (!Cxx1yLoc.isValid())
1068 Cxx1yLoc = S->getLocStart();
1070 IfStmt *If = cast<IfStmt>(S);
1071 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts,
1074 if (If->getElse() &&
1075 !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts,
1081 case Stmt::WhileStmtClass:
1082 case Stmt::DoStmtClass:
1083 case Stmt::ForStmtClass:
1084 case Stmt::CXXForRangeStmtClass:
1085 case Stmt::ContinueStmtClass:
1086 // C++1y allows all of these. We don't allow them as extensions in C++11,
1087 // because they don't make sense without variable mutation.
1088 if (!SemaRef.getLangOpts().CPlusPlus14)
1090 if (!Cxx1yLoc.isValid())
1091 Cxx1yLoc = S->getLocStart();
1092 for (Stmt *SubStmt : S->children())
1094 !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts,
1099 case Stmt::SwitchStmtClass:
1100 case Stmt::CaseStmtClass:
1101 case Stmt::DefaultStmtClass:
1102 case Stmt::BreakStmtClass:
1103 // C++1y allows switch-statements, and since they don't need variable
1104 // mutation, we can reasonably allow them in C++11 as an extension.
1105 if (!Cxx1yLoc.isValid())
1106 Cxx1yLoc = S->getLocStart();
1107 for (Stmt *SubStmt : S->children())
1109 !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts,
1118 // C++1y allows expression-statements.
1119 if (!Cxx1yLoc.isValid())
1120 Cxx1yLoc = S->getLocStart();
1124 SemaRef.Diag(S->getLocStart(), diag::err_constexpr_body_invalid_stmt)
1125 << isa<CXXConstructorDecl>(Dcl);
1129 /// Check the body for the given constexpr function declaration only contains
1130 /// the permitted types of statement. C++11 [dcl.constexpr]p3,p4.
1132 /// \return true if the body is OK, false if we have diagnosed a problem.
1133 bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) {
1134 if (isa<CXXTryStmt>(Body)) {
1135 // C++11 [dcl.constexpr]p3:
1136 // The definition of a constexpr function shall satisfy the following
1137 // constraints: [...]
1138 // - its function-body shall be = delete, = default, or a
1139 // compound-statement
1141 // C++11 [dcl.constexpr]p4:
1142 // In the definition of a constexpr constructor, [...]
1143 // - its function-body shall not be a function-try-block;
1144 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block)
1145 << isa<CXXConstructorDecl>(Dcl);
1149 SmallVector<SourceLocation, 4> ReturnStmts;
1151 // - its function-body shall be [...] a compound-statement that contains only
1152 // [... list of cases ...]
1153 CompoundStmt *CompBody = cast<CompoundStmt>(Body);
1154 SourceLocation Cxx1yLoc;
1155 for (auto *BodyIt : CompBody->body()) {
1156 if (!CheckConstexprFunctionStmt(*this, Dcl, BodyIt, ReturnStmts, Cxx1yLoc))
1160 if (Cxx1yLoc.isValid())
1162 getLangOpts().CPlusPlus14
1163 ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt
1164 : diag::ext_constexpr_body_invalid_stmt)
1165 << isa<CXXConstructorDecl>(Dcl);
1167 if (const CXXConstructorDecl *Constructor
1168 = dyn_cast<CXXConstructorDecl>(Dcl)) {
1169 const CXXRecordDecl *RD = Constructor->getParent();
1171 // - every non-variant non-static data member and base class sub-object
1172 // shall be initialized;
1174 // - if the class is a union having variant members, exactly one of them
1175 // shall be initialized;
1176 if (RD->isUnion()) {
1177 if (Constructor->getNumCtorInitializers() == 0 &&
1178 RD->hasVariantMembers()) {
1179 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init);
1182 } else if (!Constructor->isDependentContext() &&
1183 !Constructor->isDelegatingConstructor()) {
1184 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases");
1186 // Skip detailed checking if we have enough initializers, and we would
1187 // allow at most one initializer per member.
1188 bool AnyAnonStructUnionMembers = false;
1189 unsigned Fields = 0;
1190 for (CXXRecordDecl::field_iterator I = RD->field_begin(),
1191 E = RD->field_end(); I != E; ++I, ++Fields) {
1192 if (I->isAnonymousStructOrUnion()) {
1193 AnyAnonStructUnionMembers = true;
1198 // - if the class is a union-like class, but is not a union, for each of
1199 // its anonymous union members having variant members, exactly one of
1200 // them shall be initialized;
1201 if (AnyAnonStructUnionMembers ||
1202 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) {
1203 // Check initialization of non-static data members. Base classes are
1204 // always initialized so do not need to be checked. Dependent bases
1205 // might not have initializers in the member initializer list.
1206 llvm::SmallSet<Decl*, 16> Inits;
1207 for (const auto *I: Constructor->inits()) {
1208 if (FieldDecl *FD = I->getMember())
1210 else if (IndirectFieldDecl *ID = I->getIndirectMember())
1211 Inits.insert(ID->chain_begin(), ID->chain_end());
1214 bool Diagnosed = false;
1215 for (auto *I : RD->fields())
1216 CheckConstexprCtorInitializer(*this, Dcl, I, Inits, Diagnosed);
1222 if (ReturnStmts.empty()) {
1223 // C++1y doesn't require constexpr functions to contain a 'return'
1224 // statement. We still do, unless the return type might be void, because
1225 // otherwise if there's no return statement, the function cannot
1226 // be used in a core constant expression.
1227 bool OK = getLangOpts().CPlusPlus14 &&
1228 (Dcl->getReturnType()->isVoidType() ||
1229 Dcl->getReturnType()->isDependentType());
1230 Diag(Dcl->getLocation(),
1231 OK ? diag::warn_cxx11_compat_constexpr_body_no_return
1232 : diag::err_constexpr_body_no_return);
1235 } else if (ReturnStmts.size() > 1) {
1236 Diag(ReturnStmts.back(),
1237 getLangOpts().CPlusPlus14
1238 ? diag::warn_cxx11_compat_constexpr_body_multiple_return
1239 : diag::ext_constexpr_body_multiple_return);
1240 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I)
1241 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return);
1245 // C++11 [dcl.constexpr]p5:
1246 // if no function argument values exist such that the function invocation
1247 // substitution would produce a constant expression, the program is
1248 // ill-formed; no diagnostic required.
1249 // C++11 [dcl.constexpr]p3:
1250 // - every constructor call and implicit conversion used in initializing the
1251 // return value shall be one of those allowed in a constant expression.
1252 // C++11 [dcl.constexpr]p4:
1253 // - every constructor involved in initializing non-static data members and
1254 // base class sub-objects shall be a constexpr constructor.
1255 SmallVector<PartialDiagnosticAt, 8> Diags;
1256 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) {
1257 Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr)
1258 << isa<CXXConstructorDecl>(Dcl);
1259 for (size_t I = 0, N = Diags.size(); I != N; ++I)
1260 Diag(Diags[I].first, Diags[I].second);
1261 // Don't return false here: we allow this for compatibility in
1268 /// isCurrentClassName - Determine whether the identifier II is the
1269 /// name of the class type currently being defined. In the case of
1270 /// nested classes, this will only return true if II is the name of
1271 /// the innermost class.
1272 bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *,
1273 const CXXScopeSpec *SS) {
1274 assert(getLangOpts().CPlusPlus && "No class names in C!");
1276 CXXRecordDecl *CurDecl;
1277 if (SS && SS->isSet() && !SS->isInvalid()) {
1278 DeclContext *DC = computeDeclContext(*SS, true);
1279 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
1281 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
1283 if (CurDecl && CurDecl->getIdentifier())
1284 return &II == CurDecl->getIdentifier();
1288 /// \brief Determine whether the identifier II is a typo for the name of
1289 /// the class type currently being defined. If so, update it to the identifier
1290 /// that should have been used.
1291 bool Sema::isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS) {
1292 assert(getLangOpts().CPlusPlus && "No class names in C!");
1294 if (!getLangOpts().SpellChecking)
1297 CXXRecordDecl *CurDecl;
1298 if (SS && SS->isSet() && !SS->isInvalid()) {
1299 DeclContext *DC = computeDeclContext(*SS, true);
1300 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
1302 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
1304 if (CurDecl && CurDecl->getIdentifier() && II != CurDecl->getIdentifier() &&
1305 3 * II->getName().edit_distance(CurDecl->getIdentifier()->getName())
1306 < II->getLength()) {
1307 II = CurDecl->getIdentifier();
1314 /// \brief Determine whether the given class is a base class of the given
1315 /// class, including looking at dependent bases.
1316 static bool findCircularInheritance(const CXXRecordDecl *Class,
1317 const CXXRecordDecl *Current) {
1318 SmallVector<const CXXRecordDecl*, 8> Queue;
1320 Class = Class->getCanonicalDecl();
1322 for (const auto &I : Current->bases()) {
1323 CXXRecordDecl *Base = I.getType()->getAsCXXRecordDecl();
1327 Base = Base->getDefinition();
1331 if (Base->getCanonicalDecl() == Class)
1334 Queue.push_back(Base);
1340 Current = Queue.pop_back_val();
1346 /// \brief Check the validity of a C++ base class specifier.
1348 /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics
1349 /// and returns NULL otherwise.
1351 Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
1352 SourceRange SpecifierRange,
1353 bool Virtual, AccessSpecifier Access,
1354 TypeSourceInfo *TInfo,
1355 SourceLocation EllipsisLoc) {
1356 QualType BaseType = TInfo->getType();
1358 // C++ [class.union]p1:
1359 // A union shall not have base classes.
1360 if (Class->isUnion()) {
1361 Diag(Class->getLocation(), diag::err_base_clause_on_union)
1366 if (EllipsisLoc.isValid() &&
1367 !TInfo->getType()->containsUnexpandedParameterPack()) {
1368 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
1369 << TInfo->getTypeLoc().getSourceRange();
1370 EllipsisLoc = SourceLocation();
1373 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc();
1375 if (BaseType->isDependentType()) {
1376 // Make sure that we don't have circular inheritance among our dependent
1377 // bases. For non-dependent bases, the check for completeness below handles
1379 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) {
1380 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() ||
1381 ((BaseDecl = BaseDecl->getDefinition()) &&
1382 findCircularInheritance(Class, BaseDecl))) {
1383 Diag(BaseLoc, diag::err_circular_inheritance)
1384 << BaseType << Context.getTypeDeclType(Class);
1386 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl())
1387 Diag(BaseDecl->getLocation(), diag::note_previous_decl)
1394 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
1395 Class->getTagKind() == TTK_Class,
1396 Access, TInfo, EllipsisLoc);
1399 // Base specifiers must be record types.
1400 if (!BaseType->isRecordType()) {
1401 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange;
1405 // C++ [class.union]p1:
1406 // A union shall not be used as a base class.
1407 if (BaseType->isUnionType()) {
1408 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange;
1412 // For the MS ABI, propagate DLL attributes to base class templates.
1413 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
1414 if (Attr *ClassAttr = getDLLAttr(Class)) {
1415 if (auto *BaseTemplate = dyn_cast_or_null<ClassTemplateSpecializationDecl>(
1416 BaseType->getAsCXXRecordDecl())) {
1417 propagateDLLAttrToBaseClassTemplate(Class, ClassAttr, BaseTemplate,
1423 // C++ [class.derived]p2:
1424 // The class-name in a base-specifier shall not be an incompletely
1426 if (RequireCompleteType(BaseLoc, BaseType,
1427 diag::err_incomplete_base_class, SpecifierRange)) {
1428 Class->setInvalidDecl();
1432 // If the base class is polymorphic or isn't empty, the new one is/isn't, too.
1433 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl();
1434 assert(BaseDecl && "Record type has no declaration");
1435 BaseDecl = BaseDecl->getDefinition();
1436 assert(BaseDecl && "Base type is not incomplete, but has no definition");
1437 CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl);
1438 assert(CXXBaseDecl && "Base type is not a C++ type");
1440 // A class which contains a flexible array member is not suitable for use as a
1442 // - If the layout determines that a base comes before another base,
1443 // the flexible array member would index into the subsequent base.
1444 // - If the layout determines that base comes before the derived class,
1445 // the flexible array member would index into the derived class.
1446 if (CXXBaseDecl->hasFlexibleArrayMember()) {
1447 Diag(BaseLoc, diag::err_base_class_has_flexible_array_member)
1448 << CXXBaseDecl->getDeclName();
1453 // If a class is marked final and it appears as a base-type-specifier in
1454 // base-clause, the program is ill-formed.
1455 if (FinalAttr *FA = CXXBaseDecl->getAttr<FinalAttr>()) {
1456 Diag(BaseLoc, diag::err_class_marked_final_used_as_base)
1457 << CXXBaseDecl->getDeclName()
1458 << FA->isSpelledAsSealed();
1459 Diag(CXXBaseDecl->getLocation(), diag::note_entity_declared_at)
1460 << CXXBaseDecl->getDeclName() << FA->getRange();
1464 if (BaseDecl->isInvalidDecl())
1465 Class->setInvalidDecl();
1467 // Create the base specifier.
1468 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
1469 Class->getTagKind() == TTK_Class,
1470 Access, TInfo, EllipsisLoc);
1473 /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
1474 /// one entry in the base class list of a class specifier, for
1476 /// class foo : public bar, virtual private baz {
1477 /// 'public bar' and 'virtual private baz' are each base-specifiers.
1479 Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange,
1480 ParsedAttributes &Attributes,
1481 bool Virtual, AccessSpecifier Access,
1482 ParsedType basetype, SourceLocation BaseLoc,
1483 SourceLocation EllipsisLoc) {
1487 AdjustDeclIfTemplate(classdecl);
1488 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl);
1492 // We haven't yet attached the base specifiers.
1493 Class->setIsParsingBaseSpecifiers();
1495 // We do not support any C++11 attributes on base-specifiers yet.
1496 // Diagnose any attributes we see.
1497 if (!Attributes.empty()) {
1498 for (AttributeList *Attr = Attributes.getList(); Attr;
1499 Attr = Attr->getNext()) {
1500 if (Attr->isInvalid() ||
1501 Attr->getKind() == AttributeList::IgnoredAttribute)
1503 Diag(Attr->getLoc(),
1504 Attr->getKind() == AttributeList::UnknownAttribute
1505 ? diag::warn_unknown_attribute_ignored
1506 : diag::err_base_specifier_attribute)
1511 TypeSourceInfo *TInfo = nullptr;
1512 GetTypeFromParser(basetype, &TInfo);
1514 if (EllipsisLoc.isInvalid() &&
1515 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo,
1519 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange,
1520 Virtual, Access, TInfo,
1524 Class->setInvalidDecl();
1529 /// Use small set to collect indirect bases. As this is only used
1530 /// locally, there's no need to abstract the small size parameter.
1531 typedef llvm::SmallPtrSet<QualType, 4> IndirectBaseSet;
1533 /// \brief Recursively add the bases of Type. Don't add Type itself.
1535 NoteIndirectBases(ASTContext &Context, IndirectBaseSet &Set,
1536 const QualType &Type)
1538 // Even though the incoming type is a base, it might not be
1539 // a class -- it could be a template parm, for instance.
1540 if (auto Rec = Type->getAs<RecordType>()) {
1541 auto Decl = Rec->getAsCXXRecordDecl();
1543 // Iterate over its bases.
1544 for (const auto &BaseSpec : Decl->bases()) {
1545 QualType Base = Context.getCanonicalType(BaseSpec.getType())
1546 .getUnqualifiedType();
1547 if (Set.insert(Base).second)
1548 // If we've not already seen it, recurse.
1549 NoteIndirectBases(Context, Set, Base);
1554 /// \brief Performs the actual work of attaching the given base class
1555 /// specifiers to a C++ class.
1556 bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class,
1557 MutableArrayRef<CXXBaseSpecifier *> Bases) {
1561 // Used to keep track of which base types we have already seen, so
1562 // that we can properly diagnose redundant direct base types. Note
1563 // that the key is always the unqualified canonical type of the base
1565 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes;
1567 // Used to track indirect bases so we can see if a direct base is
1569 IndirectBaseSet IndirectBaseTypes;
1571 // Copy non-redundant base specifiers into permanent storage.
1572 unsigned NumGoodBases = 0;
1573 bool Invalid = false;
1574 for (unsigned idx = 0; idx < Bases.size(); ++idx) {
1575 QualType NewBaseType
1576 = Context.getCanonicalType(Bases[idx]->getType());
1577 NewBaseType = NewBaseType.getLocalUnqualifiedType();
1579 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType];
1581 // C++ [class.mi]p3:
1582 // A class shall not be specified as a direct base class of a
1583 // derived class more than once.
1584 Diag(Bases[idx]->getLocStart(),
1585 diag::err_duplicate_base_class)
1586 << KnownBase->getType()
1587 << Bases[idx]->getSourceRange();
1589 // Delete the duplicate base class specifier; we're going to
1590 // overwrite its pointer later.
1591 Context.Deallocate(Bases[idx]);
1595 // Okay, add this new base class.
1596 KnownBase = Bases[idx];
1597 Bases[NumGoodBases++] = Bases[idx];
1599 // Note this base's direct & indirect bases, if there could be ambiguity.
1600 if (Bases.size() > 1)
1601 NoteIndirectBases(Context, IndirectBaseTypes, NewBaseType);
1603 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) {
1604 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
1605 if (Class->isInterface() &&
1606 (!RD->isInterface() ||
1607 KnownBase->getAccessSpecifier() != AS_public)) {
1608 // The Microsoft extension __interface does not permit bases that
1609 // are not themselves public interfaces.
1610 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface)
1611 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName()
1612 << RD->getSourceRange();
1615 if (RD->hasAttr<WeakAttr>())
1616 Class->addAttr(WeakAttr::CreateImplicit(Context));
1621 // Attach the remaining base class specifiers to the derived class.
1622 Class->setBases(Bases.data(), NumGoodBases);
1624 for (unsigned idx = 0; idx < NumGoodBases; ++idx) {
1625 // Check whether this direct base is inaccessible due to ambiguity.
1626 QualType BaseType = Bases[idx]->getType();
1627 CanQualType CanonicalBase = Context.getCanonicalType(BaseType)
1628 .getUnqualifiedType();
1630 if (IndirectBaseTypes.count(CanonicalBase)) {
1631 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1632 /*DetectVirtual=*/true);
1634 = Class->isDerivedFrom(CanonicalBase->getAsCXXRecordDecl(), Paths);
1638 if (Paths.isAmbiguous(CanonicalBase))
1639 Diag(Bases[idx]->getLocStart (), diag::warn_inaccessible_base_class)
1640 << BaseType << getAmbiguousPathsDisplayString(Paths)
1641 << Bases[idx]->getSourceRange();
1643 assert(Bases[idx]->isVirtual());
1646 // Delete the base class specifier, since its data has been copied
1647 // into the CXXRecordDecl.
1648 Context.Deallocate(Bases[idx]);
1654 /// ActOnBaseSpecifiers - Attach the given base specifiers to the
1655 /// class, after checking whether there are any duplicate base
1657 void Sema::ActOnBaseSpecifiers(Decl *ClassDecl,
1658 MutableArrayRef<CXXBaseSpecifier *> Bases) {
1659 if (!ClassDecl || Bases.empty())
1662 AdjustDeclIfTemplate(ClassDecl);
1663 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), Bases);
1666 /// \brief Determine whether the type \p Derived is a C++ class that is
1667 /// derived from the type \p Base.
1668 bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base) {
1669 if (!getLangOpts().CPlusPlus)
1672 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl();
1676 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl();
1680 // If either the base or the derived type is invalid, don't try to
1681 // check whether one is derived from the other.
1682 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl())
1685 // FIXME: In a modules build, do we need the entire path to be visible for us
1686 // to be able to use the inheritance relationship?
1687 if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined())
1690 return DerivedRD->isDerivedFrom(BaseRD);
1693 /// \brief Determine whether the type \p Derived is a C++ class that is
1694 /// derived from the type \p Base.
1695 bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base,
1696 CXXBasePaths &Paths) {
1697 if (!getLangOpts().CPlusPlus)
1700 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl();
1704 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl();
1708 if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined())
1711 return DerivedRD->isDerivedFrom(BaseRD, Paths);
1714 void Sema::BuildBasePathArray(const CXXBasePaths &Paths,
1715 CXXCastPath &BasePathArray) {
1716 assert(BasePathArray.empty() && "Base path array must be empty!");
1717 assert(Paths.isRecordingPaths() && "Must record paths!");
1719 const CXXBasePath &Path = Paths.front();
1721 // We first go backward and check if we have a virtual base.
1722 // FIXME: It would be better if CXXBasePath had the base specifier for
1723 // the nearest virtual base.
1725 for (unsigned I = Path.size(); I != 0; --I) {
1726 if (Path[I - 1].Base->isVirtual()) {
1732 // Now add all bases.
1733 for (unsigned I = Start, E = Path.size(); I != E; ++I)
1734 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base));
1737 /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base
1738 /// conversion (where Derived and Base are class types) is
1739 /// well-formed, meaning that the conversion is unambiguous (and
1740 /// that all of the base classes are accessible). Returns true
1741 /// and emits a diagnostic if the code is ill-formed, returns false
1742 /// otherwise. Loc is the location where this routine should point to
1743 /// if there is an error, and Range is the source range to highlight
1744 /// if there is an error.
1746 /// If either InaccessibleBaseID or AmbigiousBaseConvID are 0, then the
1747 /// diagnostic for the respective type of error will be suppressed, but the
1748 /// check for ill-formed code will still be performed.
1750 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
1751 unsigned InaccessibleBaseID,
1752 unsigned AmbigiousBaseConvID,
1753 SourceLocation Loc, SourceRange Range,
1754 DeclarationName Name,
1755 CXXCastPath *BasePath,
1756 bool IgnoreAccess) {
1757 // First, determine whether the path from Derived to Base is
1758 // ambiguous. This is slightly more expensive than checking whether
1759 // the Derived to Base conversion exists, because here we need to
1760 // explore multiple paths to determine if there is an ambiguity.
1761 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1762 /*DetectVirtual=*/false);
1763 bool DerivationOkay = IsDerivedFrom(Loc, Derived, Base, Paths);
1764 assert(DerivationOkay &&
1765 "Can only be used with a derived-to-base conversion");
1766 (void)DerivationOkay;
1768 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) {
1769 if (!IgnoreAccess) {
1770 // Check that the base class can be accessed.
1771 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(),
1772 InaccessibleBaseID)) {
1773 case AR_inaccessible:
1782 // Build a base path if necessary.
1784 BuildBasePathArray(Paths, *BasePath);
1788 if (AmbigiousBaseConvID) {
1789 // We know that the derived-to-base conversion is ambiguous, and
1790 // we're going to produce a diagnostic. Perform the derived-to-base
1791 // search just one more time to compute all of the possible paths so
1792 // that we can print them out. This is more expensive than any of
1793 // the previous derived-to-base checks we've done, but at this point
1794 // performance isn't as much of an issue.
1796 Paths.setRecordingPaths(true);
1797 bool StillOkay = IsDerivedFrom(Loc, Derived, Base, Paths);
1798 assert(StillOkay && "Can only be used with a derived-to-base conversion");
1801 // Build up a textual representation of the ambiguous paths, e.g.,
1802 // D -> B -> A, that will be used to illustrate the ambiguous
1803 // conversions in the diagnostic. We only print one of the paths
1804 // to each base class subobject.
1805 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths);
1807 Diag(Loc, AmbigiousBaseConvID)
1808 << Derived << Base << PathDisplayStr << Range << Name;
1814 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
1815 SourceLocation Loc, SourceRange Range,
1816 CXXCastPath *BasePath,
1817 bool IgnoreAccess) {
1818 return CheckDerivedToBaseConversion(
1819 Derived, Base, diag::err_upcast_to_inaccessible_base,
1820 diag::err_ambiguous_derived_to_base_conv, Loc, Range, DeclarationName(),
1821 BasePath, IgnoreAccess);
1825 /// @brief Builds a string representing ambiguous paths from a
1826 /// specific derived class to different subobjects of the same base
1829 /// This function builds a string that can be used in error messages
1830 /// to show the different paths that one can take through the
1831 /// inheritance hierarchy to go from the derived class to different
1832 /// subobjects of a base class. The result looks something like this:
1834 /// struct D -> struct B -> struct A
1835 /// struct D -> struct C -> struct A
1837 std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) {
1838 std::string PathDisplayStr;
1839 std::set<unsigned> DisplayedPaths;
1840 for (CXXBasePaths::paths_iterator Path = Paths.begin();
1841 Path != Paths.end(); ++Path) {
1842 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) {
1843 // We haven't displayed a path to this particular base
1844 // class subobject yet.
1845 PathDisplayStr += "\n ";
1846 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString();
1847 for (CXXBasePath::const_iterator Element = Path->begin();
1848 Element != Path->end(); ++Element)
1849 PathDisplayStr += " -> " + Element->Base->getType().getAsString();
1853 return PathDisplayStr;
1856 //===----------------------------------------------------------------------===//
1857 // C++ class member Handling
1858 //===----------------------------------------------------------------------===//
1860 /// ActOnAccessSpecifier - Parsed an access specifier followed by a colon.
1861 bool Sema::ActOnAccessSpecifier(AccessSpecifier Access,
1862 SourceLocation ASLoc,
1863 SourceLocation ColonLoc,
1864 AttributeList *Attrs) {
1865 assert(Access != AS_none && "Invalid kind for syntactic access specifier!");
1866 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext,
1868 CurContext->addHiddenDecl(ASDecl);
1869 return ProcessAccessDeclAttributeList(ASDecl, Attrs);
1872 /// CheckOverrideControl - Check C++11 override control semantics.
1873 void Sema::CheckOverrideControl(NamedDecl *D) {
1874 if (D->isInvalidDecl())
1877 // We only care about "override" and "final" declarations.
1878 if (!D->hasAttr<OverrideAttr>() && !D->hasAttr<FinalAttr>())
1881 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D);
1883 // We can't check dependent instance methods.
1884 if (MD && MD->isInstance() &&
1885 (MD->getParent()->hasAnyDependentBases() ||
1886 MD->getType()->isDependentType()))
1889 if (MD && !MD->isVirtual()) {
1890 // If we have a non-virtual method, check if if hides a virtual method.
1891 // (In that case, it's most likely the method has the wrong type.)
1892 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
1893 FindHiddenVirtualMethods(MD, OverloadedMethods);
1895 if (!OverloadedMethods.empty()) {
1896 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) {
1897 Diag(OA->getLocation(),
1898 diag::override_keyword_hides_virtual_member_function)
1899 << "override" << (OverloadedMethods.size() > 1);
1900 } else if (FinalAttr *FA = D->getAttr<FinalAttr>()) {
1901 Diag(FA->getLocation(),
1902 diag::override_keyword_hides_virtual_member_function)
1903 << (FA->isSpelledAsSealed() ? "sealed" : "final")
1904 << (OverloadedMethods.size() > 1);
1906 NoteHiddenVirtualMethods(MD, OverloadedMethods);
1907 MD->setInvalidDecl();
1910 // Fall through into the general case diagnostic.
1911 // FIXME: We might want to attempt typo correction here.
1914 if (!MD || !MD->isVirtual()) {
1915 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) {
1916 Diag(OA->getLocation(),
1917 diag::override_keyword_only_allowed_on_virtual_member_functions)
1918 << "override" << FixItHint::CreateRemoval(OA->getLocation());
1919 D->dropAttr<OverrideAttr>();
1921 if (FinalAttr *FA = D->getAttr<FinalAttr>()) {
1922 Diag(FA->getLocation(),
1923 diag::override_keyword_only_allowed_on_virtual_member_functions)
1924 << (FA->isSpelledAsSealed() ? "sealed" : "final")
1925 << FixItHint::CreateRemoval(FA->getLocation());
1926 D->dropAttr<FinalAttr>();
1931 // C++11 [class.virtual]p5:
1932 // If a function is marked with the virt-specifier override and
1933 // does not override a member function of a base class, the program is
1935 bool HasOverriddenMethods =
1936 MD->begin_overridden_methods() != MD->end_overridden_methods();
1937 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods)
1938 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding)
1939 << MD->getDeclName();
1942 void Sema::DiagnoseAbsenceOfOverrideControl(NamedDecl *D) {
1943 if (D->isInvalidDecl() || D->hasAttr<OverrideAttr>())
1945 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D);
1946 if (!MD || MD->isImplicit() || MD->hasAttr<FinalAttr>() ||
1947 isa<CXXDestructorDecl>(MD))
1950 SourceLocation Loc = MD->getLocation();
1951 SourceLocation SpellingLoc = Loc;
1952 if (getSourceManager().isMacroArgExpansion(Loc))
1953 SpellingLoc = getSourceManager().getImmediateExpansionRange(Loc).first;
1954 SpellingLoc = getSourceManager().getSpellingLoc(SpellingLoc);
1955 if (SpellingLoc.isValid() && getSourceManager().isInSystemHeader(SpellingLoc))
1958 if (MD->size_overridden_methods() > 0) {
1959 Diag(MD->getLocation(), diag::warn_function_marked_not_override_overriding)
1960 << MD->getDeclName();
1961 const CXXMethodDecl *OMD = *MD->begin_overridden_methods();
1962 Diag(OMD->getLocation(), diag::note_overridden_virtual_function);
1966 /// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member
1967 /// function overrides a virtual member function marked 'final', according to
1968 /// C++11 [class.virtual]p4.
1969 bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New,
1970 const CXXMethodDecl *Old) {
1971 FinalAttr *FA = Old->getAttr<FinalAttr>();
1975 Diag(New->getLocation(), diag::err_final_function_overridden)
1976 << New->getDeclName()
1977 << FA->isSpelledAsSealed();
1978 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
1982 static bool InitializationHasSideEffects(const FieldDecl &FD) {
1983 const Type *T = FD.getType()->getBaseElementTypeUnsafe();
1984 // FIXME: Destruction of ObjC lifetime types has side-effects.
1985 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
1986 return !RD->isCompleteDefinition() ||
1987 !RD->hasTrivialDefaultConstructor() ||
1988 !RD->hasTrivialDestructor();
1992 static AttributeList *getMSPropertyAttr(AttributeList *list) {
1993 for (AttributeList *it = list; it != nullptr; it = it->getNext())
1994 if (it->isDeclspecPropertyAttribute())
1999 /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member
2000 /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the
2001 /// bitfield width if there is one, 'InitExpr' specifies the initializer if
2002 /// one has been parsed, and 'InitStyle' is set if an in-class initializer is
2003 /// present (but parsing it has been deferred).
2005 Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
2006 MultiTemplateParamsArg TemplateParameterLists,
2007 Expr *BW, const VirtSpecifiers &VS,
2008 InClassInitStyle InitStyle) {
2009 const DeclSpec &DS = D.getDeclSpec();
2010 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
2011 DeclarationName Name = NameInfo.getName();
2012 SourceLocation Loc = NameInfo.getLoc();
2014 // For anonymous bitfields, the location should point to the type.
2015 if (Loc.isInvalid())
2016 Loc = D.getLocStart();
2018 Expr *BitWidth = static_cast<Expr*>(BW);
2020 assert(isa<CXXRecordDecl>(CurContext));
2021 assert(!DS.isFriendSpecified());
2023 bool isFunc = D.isDeclarationOfFunction();
2025 if (cast<CXXRecordDecl>(CurContext)->isInterface()) {
2026 // The Microsoft extension __interface only permits public member functions
2027 // and prohibits constructors, destructors, operators, non-public member
2028 // functions, static methods and data members.
2029 unsigned InvalidDecl;
2030 bool ShowDeclName = true;
2032 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1;
2033 else if (AS != AS_public)
2035 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static)
2037 else switch (Name.getNameKind()) {
2038 case DeclarationName::CXXConstructorName:
2040 ShowDeclName = false;
2043 case DeclarationName::CXXDestructorName:
2045 ShowDeclName = false;
2048 case DeclarationName::CXXOperatorName:
2049 case DeclarationName::CXXConversionFunctionName:
2060 Diag(Loc, diag::err_invalid_member_in_interface)
2061 << (InvalidDecl-1) << Name;
2063 Diag(Loc, diag::err_invalid_member_in_interface)
2064 << (InvalidDecl-1) << "";
2069 // C++ 9.2p6: A member shall not be declared to have automatic storage
2070 // duration (auto, register) or with the extern storage-class-specifier.
2071 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class
2072 // data members and cannot be applied to names declared const or static,
2073 // and cannot be applied to reference members.
2074 switch (DS.getStorageClassSpec()) {
2075 case DeclSpec::SCS_unspecified:
2076 case DeclSpec::SCS_typedef:
2077 case DeclSpec::SCS_static:
2079 case DeclSpec::SCS_mutable:
2081 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function);
2083 // FIXME: It would be nicer if the keyword was ignored only for this
2084 // declarator. Otherwise we could get follow-up errors.
2085 D.getMutableDeclSpec().ClearStorageClassSpecs();
2089 Diag(DS.getStorageClassSpecLoc(),
2090 diag::err_storageclass_invalid_for_member);
2091 D.getMutableDeclSpec().ClearStorageClassSpecs();
2095 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
2096 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
2099 if (DS.isConstexprSpecified() && isInstField) {
2100 SemaDiagnosticBuilder B =
2101 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member);
2102 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc();
2103 if (InitStyle == ICIS_NoInit) {
2105 if (D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const)
2106 B << FixItHint::CreateRemoval(ConstexprLoc);
2108 B << FixItHint::CreateReplacement(ConstexprLoc, "const");
2109 D.getMutableDeclSpec().ClearConstexprSpec();
2110 const char *PrevSpec;
2112 bool Failed = D.getMutableDeclSpec().SetTypeQual(
2113 DeclSpec::TQ_const, ConstexprLoc, PrevSpec, DiagID, getLangOpts());
2115 assert(!Failed && "Making a constexpr member const shouldn't fail");
2119 const char *PrevSpec;
2121 if (D.getMutableDeclSpec().SetStorageClassSpec(
2122 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID,
2123 Context.getPrintingPolicy())) {
2124 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable &&
2125 "This is the only DeclSpec that should fail to be applied");
2128 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static ");
2129 isInstField = false;
2136 CXXScopeSpec &SS = D.getCXXScopeSpec();
2138 // Data members must have identifiers for names.
2139 if (!Name.isIdentifier()) {
2140 Diag(Loc, diag::err_bad_variable_name)
2145 IdentifierInfo *II = Name.getAsIdentifierInfo();
2147 // Member field could not be with "template" keyword.
2148 // So TemplateParameterLists should be empty in this case.
2149 if (TemplateParameterLists.size()) {
2150 TemplateParameterList* TemplateParams = TemplateParameterLists[0];
2151 if (TemplateParams->size()) {
2152 // There is no such thing as a member field template.
2153 Diag(D.getIdentifierLoc(), diag::err_template_member)
2155 << SourceRange(TemplateParams->getTemplateLoc(),
2156 TemplateParams->getRAngleLoc());
2158 // There is an extraneous 'template<>' for this member.
2159 Diag(TemplateParams->getTemplateLoc(),
2160 diag::err_template_member_noparams)
2162 << SourceRange(TemplateParams->getTemplateLoc(),
2163 TemplateParams->getRAngleLoc());
2168 if (SS.isSet() && !SS.isInvalid()) {
2169 // The user provided a superfluous scope specifier inside a class
2175 if (DeclContext *DC = computeDeclContext(SS, false))
2176 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc());
2178 Diag(D.getIdentifierLoc(), diag::err_member_qualification)
2179 << Name << SS.getRange();
2184 AttributeList *MSPropertyAttr =
2185 getMSPropertyAttr(D.getDeclSpec().getAttributes().getList());
2186 if (MSPropertyAttr) {
2187 Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D,
2188 BitWidth, InitStyle, AS, MSPropertyAttr);
2191 isInstField = false;
2193 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D,
2194 BitWidth, InitStyle, AS);
2195 assert(Member && "HandleField never returns null");
2198 Member = HandleDeclarator(S, D, TemplateParameterLists);
2202 // Non-instance-fields can't have a bitfield.
2204 if (Member->isInvalidDecl()) {
2205 // don't emit another diagnostic.
2206 } else if (isa<VarDecl>(Member) || isa<VarTemplateDecl>(Member)) {
2207 // C++ 9.6p3: A bit-field shall not be a static member.
2208 // "static member 'A' cannot be a bit-field"
2209 Diag(Loc, diag::err_static_not_bitfield)
2210 << Name << BitWidth->getSourceRange();
2211 } else if (isa<TypedefDecl>(Member)) {
2212 // "typedef member 'x' cannot be a bit-field"
2213 Diag(Loc, diag::err_typedef_not_bitfield)
2214 << Name << BitWidth->getSourceRange();
2216 // A function typedef ("typedef int f(); f a;").
2217 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
2218 Diag(Loc, diag::err_not_integral_type_bitfield)
2219 << Name << cast<ValueDecl>(Member)->getType()
2220 << BitWidth->getSourceRange();
2224 Member->setInvalidDecl();
2227 Member->setAccess(AS);
2229 // If we have declared a member function template or static data member
2230 // template, set the access of the templated declaration as well.
2231 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member))
2232 FunTmpl->getTemplatedDecl()->setAccess(AS);
2233 else if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(Member))
2234 VarTmpl->getTemplatedDecl()->setAccess(AS);
2237 if (VS.isOverrideSpecified())
2238 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context, 0));
2239 if (VS.isFinalSpecified())
2240 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context,
2241 VS.isFinalSpelledSealed()));
2243 if (VS.getLastLocation().isValid()) {
2244 // Update the end location of a method that has a virt-specifiers.
2245 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member))
2246 MD->setRangeEnd(VS.getLastLocation());
2249 CheckOverrideControl(Member);
2251 assert((Name || isInstField) && "No identifier for non-field ?");
2254 FieldDecl *FD = cast<FieldDecl>(Member);
2255 FieldCollector->Add(FD);
2257 if (!Diags.isIgnored(diag::warn_unused_private_field, FD->getLocation())) {
2258 // Remember all explicit private FieldDecls that have a name, no side
2259 // effects and are not part of a dependent type declaration.
2260 if (!FD->isImplicit() && FD->getDeclName() &&
2261 FD->getAccess() == AS_private &&
2262 !FD->hasAttr<UnusedAttr>() &&
2263 !FD->getParent()->isDependentContext() &&
2264 !InitializationHasSideEffects(*FD))
2265 UnusedPrivateFields.insert(FD);
2273 class UninitializedFieldVisitor
2274 : public EvaluatedExprVisitor<UninitializedFieldVisitor> {
2276 // List of Decls to generate a warning on. Also remove Decls that become
2278 llvm::SmallPtrSetImpl<ValueDecl*> &Decls;
2279 // List of base classes of the record. Classes are removed after their
2281 llvm::SmallPtrSetImpl<QualType> &BaseClasses;
2282 // Vector of decls to be removed from the Decl set prior to visiting the
2283 // nodes. These Decls may have been initialized in the prior initializer.
2284 llvm::SmallVector<ValueDecl*, 4> DeclsToRemove;
2285 // If non-null, add a note to the warning pointing back to the constructor.
2286 const CXXConstructorDecl *Constructor;
2287 // Variables to hold state when processing an initializer list. When
2288 // InitList is true, special case initialization of FieldDecls matching
2289 // InitListFieldDecl.
2291 FieldDecl *InitListFieldDecl;
2292 llvm::SmallVector<unsigned, 4> InitFieldIndex;
2295 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited;
2296 UninitializedFieldVisitor(Sema &S,
2297 llvm::SmallPtrSetImpl<ValueDecl*> &Decls,
2298 llvm::SmallPtrSetImpl<QualType> &BaseClasses)
2299 : Inherited(S.Context), S(S), Decls(Decls), BaseClasses(BaseClasses),
2300 Constructor(nullptr), InitList(false), InitListFieldDecl(nullptr) {}
2302 // Returns true if the use of ME is not an uninitialized use.
2303 bool IsInitListMemberExprInitialized(MemberExpr *ME,
2304 bool CheckReferenceOnly) {
2305 llvm::SmallVector<FieldDecl*, 4> Fields;
2306 bool ReferenceField = false;
2308 FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl());
2311 Fields.push_back(FD);
2312 if (FD->getType()->isReferenceType())
2313 ReferenceField = true;
2314 ME = dyn_cast<MemberExpr>(ME->getBase()->IgnoreParenImpCasts());
2317 // Binding a reference to an unintialized field is not an
2318 // uninitialized use.
2319 if (CheckReferenceOnly && !ReferenceField)
2322 llvm::SmallVector<unsigned, 4> UsedFieldIndex;
2323 // Discard the first field since it is the field decl that is being
2325 for (auto I = Fields.rbegin() + 1, E = Fields.rend(); I != E; ++I) {
2326 UsedFieldIndex.push_back((*I)->getFieldIndex());
2329 for (auto UsedIter = UsedFieldIndex.begin(),
2330 UsedEnd = UsedFieldIndex.end(),
2331 OrigIter = InitFieldIndex.begin(),
2332 OrigEnd = InitFieldIndex.end();
2333 UsedIter != UsedEnd && OrigIter != OrigEnd; ++UsedIter, ++OrigIter) {
2334 if (*UsedIter < *OrigIter)
2336 if (*UsedIter > *OrigIter)
2343 void HandleMemberExpr(MemberExpr *ME, bool CheckReferenceOnly,
2345 if (isa<EnumConstantDecl>(ME->getMemberDecl()))
2348 // FieldME is the inner-most MemberExpr that is not an anonymous struct
2350 MemberExpr *FieldME = ME;
2352 bool AllPODFields = FieldME->getType().isPODType(S.Context);
2355 while (MemberExpr *SubME =
2356 dyn_cast<MemberExpr>(Base->IgnoreParenImpCasts())) {
2358 if (isa<VarDecl>(SubME->getMemberDecl()))
2361 if (FieldDecl *FD = dyn_cast<FieldDecl>(SubME->getMemberDecl()))
2362 if (!FD->isAnonymousStructOrUnion())
2365 if (!FieldME->getType().isPODType(S.Context))
2366 AllPODFields = false;
2368 Base = SubME->getBase();
2371 if (!isa<CXXThisExpr>(Base->IgnoreParenImpCasts()))
2374 if (AddressOf && AllPODFields)
2377 ValueDecl* FoundVD = FieldME->getMemberDecl();
2379 if (ImplicitCastExpr *BaseCast = dyn_cast<ImplicitCastExpr>(Base)) {
2380 while (isa<ImplicitCastExpr>(BaseCast->getSubExpr())) {
2381 BaseCast = cast<ImplicitCastExpr>(BaseCast->getSubExpr());
2384 if (BaseCast->getCastKind() == CK_UncheckedDerivedToBase) {
2385 QualType T = BaseCast->getType();
2386 if (T->isPointerType() &&
2387 BaseClasses.count(T->getPointeeType())) {
2388 S.Diag(FieldME->getExprLoc(), diag::warn_base_class_is_uninit)
2389 << T->getPointeeType() << FoundVD;
2394 if (!Decls.count(FoundVD))
2397 const bool IsReference = FoundVD->getType()->isReferenceType();
2399 if (InitList && !AddressOf && FoundVD == InitListFieldDecl) {
2400 // Special checking for initializer lists.
2401 if (IsInitListMemberExprInitialized(ME, CheckReferenceOnly)) {
2405 // Prevent double warnings on use of unbounded references.
2406 if (CheckReferenceOnly && !IsReference)
2410 unsigned diag = IsReference
2411 ? diag::warn_reference_field_is_uninit
2412 : diag::warn_field_is_uninit;
2413 S.Diag(FieldME->getExprLoc(), diag) << FoundVD;
2415 S.Diag(Constructor->getLocation(),
2416 diag::note_uninit_in_this_constructor)
2417 << (Constructor->isDefaultConstructor() && Constructor->isImplicit());
2421 void HandleValue(Expr *E, bool AddressOf) {
2422 E = E->IgnoreParens();
2424 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
2425 HandleMemberExpr(ME, false /*CheckReferenceOnly*/,
2426 AddressOf /*AddressOf*/);
2430 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
2431 Visit(CO->getCond());
2432 HandleValue(CO->getTrueExpr(), AddressOf);
2433 HandleValue(CO->getFalseExpr(), AddressOf);
2437 if (BinaryConditionalOperator *BCO =
2438 dyn_cast<BinaryConditionalOperator>(E)) {
2439 Visit(BCO->getCond());
2440 HandleValue(BCO->getFalseExpr(), AddressOf);
2444 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) {
2445 HandleValue(OVE->getSourceExpr(), AddressOf);
2449 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
2450 switch (BO->getOpcode()) {
2455 HandleValue(BO->getLHS(), AddressOf);
2456 Visit(BO->getRHS());
2459 Visit(BO->getLHS());
2460 HandleValue(BO->getRHS(), AddressOf);
2468 void CheckInitListExpr(InitListExpr *ILE) {
2469 InitFieldIndex.push_back(0);
2470 for (auto Child : ILE->children()) {
2471 if (InitListExpr *SubList = dyn_cast<InitListExpr>(Child)) {
2472 CheckInitListExpr(SubList);
2476 ++InitFieldIndex.back();
2478 InitFieldIndex.pop_back();
2481 void CheckInitializer(Expr *E, const CXXConstructorDecl *FieldConstructor,
2482 FieldDecl *Field, const Type *BaseClass) {
2483 // Remove Decls that may have been initialized in the previous
2485 for (ValueDecl* VD : DeclsToRemove)
2487 DeclsToRemove.clear();
2489 Constructor = FieldConstructor;
2490 InitListExpr *ILE = dyn_cast<InitListExpr>(E);
2494 InitListFieldDecl = Field;
2495 InitFieldIndex.clear();
2496 CheckInitListExpr(ILE);
2505 BaseClasses.erase(BaseClass->getCanonicalTypeInternal());
2508 void VisitMemberExpr(MemberExpr *ME) {
2509 // All uses of unbounded reference fields will warn.
2510 HandleMemberExpr(ME, true /*CheckReferenceOnly*/, false /*AddressOf*/);
2513 void VisitImplicitCastExpr(ImplicitCastExpr *E) {
2514 if (E->getCastKind() == CK_LValueToRValue) {
2515 HandleValue(E->getSubExpr(), false /*AddressOf*/);
2519 Inherited::VisitImplicitCastExpr(E);
2522 void VisitCXXConstructExpr(CXXConstructExpr *E) {
2523 if (E->getConstructor()->isCopyConstructor()) {
2524 Expr *ArgExpr = E->getArg(0);
2525 if (InitListExpr *ILE = dyn_cast<InitListExpr>(ArgExpr))
2526 if (ILE->getNumInits() == 1)
2527 ArgExpr = ILE->getInit(0);
2528 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr))
2529 if (ICE->getCastKind() == CK_NoOp)
2530 ArgExpr = ICE->getSubExpr();
2531 HandleValue(ArgExpr, false /*AddressOf*/);
2534 Inherited::VisitCXXConstructExpr(E);
2537 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
2538 Expr *Callee = E->getCallee();
2539 if (isa<MemberExpr>(Callee)) {
2540 HandleValue(Callee, false /*AddressOf*/);
2541 for (auto Arg : E->arguments())
2546 Inherited::VisitCXXMemberCallExpr(E);
2549 void VisitCallExpr(CallExpr *E) {
2550 // Treat std::move as a use.
2551 if (E->getNumArgs() == 1) {
2552 if (FunctionDecl *FD = E->getDirectCallee()) {
2553 if (FD->isInStdNamespace() && FD->getIdentifier() &&
2554 FD->getIdentifier()->isStr("move")) {
2555 HandleValue(E->getArg(0), false /*AddressOf*/);
2561 Inherited::VisitCallExpr(E);
2564 void VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) {
2565 Expr *Callee = E->getCallee();
2567 if (isa<UnresolvedLookupExpr>(Callee))
2568 return Inherited::VisitCXXOperatorCallExpr(E);
2571 for (auto Arg : E->arguments())
2572 HandleValue(Arg->IgnoreParenImpCasts(), false /*AddressOf*/);
2575 void VisitBinaryOperator(BinaryOperator *E) {
2576 // If a field assignment is detected, remove the field from the
2577 // uninitiailized field set.
2578 if (E->getOpcode() == BO_Assign)
2579 if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getLHS()))
2580 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()))
2581 if (!FD->getType()->isReferenceType())
2582 DeclsToRemove.push_back(FD);
2584 if (E->isCompoundAssignmentOp()) {
2585 HandleValue(E->getLHS(), false /*AddressOf*/);
2590 Inherited::VisitBinaryOperator(E);
2593 void VisitUnaryOperator(UnaryOperator *E) {
2594 if (E->isIncrementDecrementOp()) {
2595 HandleValue(E->getSubExpr(), false /*AddressOf*/);
2598 if (E->getOpcode() == UO_AddrOf) {
2599 if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getSubExpr())) {
2600 HandleValue(ME->getBase(), true /*AddressOf*/);
2605 Inherited::VisitUnaryOperator(E);
2609 // Diagnose value-uses of fields to initialize themselves, e.g.
2611 // where foo is not also a parameter to the constructor.
2612 // Also diagnose across field uninitialized use such as
2614 // TODO: implement -Wuninitialized and fold this into that framework.
2615 static void DiagnoseUninitializedFields(
2616 Sema &SemaRef, const CXXConstructorDecl *Constructor) {
2618 if (SemaRef.getDiagnostics().isIgnored(diag::warn_field_is_uninit,
2619 Constructor->getLocation())) {
2623 if (Constructor->isInvalidDecl())
2626 const CXXRecordDecl *RD = Constructor->getParent();
2628 if (RD->getDescribedClassTemplate())
2631 // Holds fields that are uninitialized.
2632 llvm::SmallPtrSet<ValueDecl*, 4> UninitializedFields;
2634 // At the beginning, all fields are uninitialized.
2635 for (auto *I : RD->decls()) {
2636 if (auto *FD = dyn_cast<FieldDecl>(I)) {
2637 UninitializedFields.insert(FD);
2638 } else if (auto *IFD = dyn_cast<IndirectFieldDecl>(I)) {
2639 UninitializedFields.insert(IFD->getAnonField());
2643 llvm::SmallPtrSet<QualType, 4> UninitializedBaseClasses;
2644 for (auto I : RD->bases())
2645 UninitializedBaseClasses.insert(I.getType().getCanonicalType());
2647 if (UninitializedFields.empty() && UninitializedBaseClasses.empty())
2650 UninitializedFieldVisitor UninitializedChecker(SemaRef,
2651 UninitializedFields,
2652 UninitializedBaseClasses);
2654 for (const auto *FieldInit : Constructor->inits()) {
2655 if (UninitializedFields.empty() && UninitializedBaseClasses.empty())
2658 Expr *InitExpr = FieldInit->getInit();
2662 if (CXXDefaultInitExpr *Default =
2663 dyn_cast<CXXDefaultInitExpr>(InitExpr)) {
2664 InitExpr = Default->getExpr();
2667 // In class initializers will point to the constructor.
2668 UninitializedChecker.CheckInitializer(InitExpr, Constructor,
2669 FieldInit->getAnyMember(),
2670 FieldInit->getBaseClass());
2672 UninitializedChecker.CheckInitializer(InitExpr, nullptr,
2673 FieldInit->getAnyMember(),
2674 FieldInit->getBaseClass());
2680 /// \brief Enter a new C++ default initializer scope. After calling this, the
2681 /// caller must call \ref ActOnFinishCXXInClassMemberInitializer, even if
2682 /// parsing or instantiating the initializer failed.
2683 void Sema::ActOnStartCXXInClassMemberInitializer() {
2684 // Create a synthetic function scope to represent the call to the constructor
2685 // that notionally surrounds a use of this initializer.
2686 PushFunctionScope();
2689 /// \brief This is invoked after parsing an in-class initializer for a
2690 /// non-static C++ class member, and after instantiating an in-class initializer
2691 /// in a class template. Such actions are deferred until the class is complete.
2692 void Sema::ActOnFinishCXXInClassMemberInitializer(Decl *D,
2693 SourceLocation InitLoc,
2695 // Pop the notional constructor scope we created earlier.
2696 PopFunctionScopeInfo(nullptr, D);
2698 FieldDecl *FD = dyn_cast<FieldDecl>(D);
2699 assert((isa<MSPropertyDecl>(D) || FD->getInClassInitStyle() != ICIS_NoInit) &&
2700 "must set init style when field is created");
2703 D->setInvalidDecl();
2705 FD->removeInClassInitializer();
2709 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) {
2710 FD->setInvalidDecl();
2711 FD->removeInClassInitializer();
2715 ExprResult Init = InitExpr;
2716 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) {
2717 InitializedEntity Entity = InitializedEntity::InitializeMember(FD);
2718 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit
2719 ? InitializationKind::CreateDirectList(InitExpr->getLocStart())
2720 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc);
2721 InitializationSequence Seq(*this, Entity, Kind, InitExpr);
2722 Init = Seq.Perform(*this, Entity, Kind, InitExpr);
2723 if (Init.isInvalid()) {
2724 FD->setInvalidDecl();
2729 // C++11 [class.base.init]p7:
2730 // The initialization of each base and member constitutes a
2732 Init = ActOnFinishFullExpr(Init.get(), InitLoc);
2733 if (Init.isInvalid()) {
2734 FD->setInvalidDecl();
2738 InitExpr = Init.get();
2740 FD->setInClassInitializer(InitExpr);
2743 /// \brief Find the direct and/or virtual base specifiers that
2744 /// correspond to the given base type, for use in base initialization
2745 /// within a constructor.
2746 static bool FindBaseInitializer(Sema &SemaRef,
2747 CXXRecordDecl *ClassDecl,
2749 const CXXBaseSpecifier *&DirectBaseSpec,
2750 const CXXBaseSpecifier *&VirtualBaseSpec) {
2751 // First, check for a direct base class.
2752 DirectBaseSpec = nullptr;
2753 for (const auto &Base : ClassDecl->bases()) {
2754 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base.getType())) {
2755 // We found a direct base of this type. That's what we're
2757 DirectBaseSpec = &Base;
2762 // Check for a virtual base class.
2763 // FIXME: We might be able to short-circuit this if we know in advance that
2764 // there are no virtual bases.
2765 VirtualBaseSpec = nullptr;
2766 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) {
2767 // We haven't found a base yet; search the class hierarchy for a
2768 // virtual base class.
2769 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
2770 /*DetectVirtual=*/false);
2771 if (SemaRef.IsDerivedFrom(ClassDecl->getLocation(),
2772 SemaRef.Context.getTypeDeclType(ClassDecl),
2774 for (CXXBasePaths::paths_iterator Path = Paths.begin();
2775 Path != Paths.end(); ++Path) {
2776 if (Path->back().Base->isVirtual()) {
2777 VirtualBaseSpec = Path->back().Base;
2784 return DirectBaseSpec || VirtualBaseSpec;
2787 /// \brief Handle a C++ member initializer using braced-init-list syntax.
2789 Sema::ActOnMemInitializer(Decl *ConstructorD,
2792 IdentifierInfo *MemberOrBase,
2793 ParsedType TemplateTypeTy,
2795 SourceLocation IdLoc,
2797 SourceLocation EllipsisLoc) {
2798 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
2799 DS, IdLoc, InitList,
2803 /// \brief Handle a C++ member initializer using parentheses syntax.
2805 Sema::ActOnMemInitializer(Decl *ConstructorD,
2808 IdentifierInfo *MemberOrBase,
2809 ParsedType TemplateTypeTy,
2811 SourceLocation IdLoc,
2812 SourceLocation LParenLoc,
2813 ArrayRef<Expr *> Args,
2814 SourceLocation RParenLoc,
2815 SourceLocation EllipsisLoc) {
2816 Expr *List = new (Context) ParenListExpr(Context, LParenLoc,
2818 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy,
2819 DS, IdLoc, List, EllipsisLoc);
2824 // Callback to only accept typo corrections that can be a valid C++ member
2825 // intializer: either a non-static field member or a base class.
2826 class MemInitializerValidatorCCC : public CorrectionCandidateCallback {
2828 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl)
2829 : ClassDecl(ClassDecl) {}
2831 bool ValidateCandidate(const TypoCorrection &candidate) override {
2832 if (NamedDecl *ND = candidate.getCorrectionDecl()) {
2833 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND))
2834 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl);
2835 return isa<TypeDecl>(ND);
2841 CXXRecordDecl *ClassDecl;
2846 /// \brief Handle a C++ member initializer.
2848 Sema::BuildMemInitializer(Decl *ConstructorD,
2851 IdentifierInfo *MemberOrBase,
2852 ParsedType TemplateTypeTy,
2854 SourceLocation IdLoc,
2856 SourceLocation EllipsisLoc) {
2857 ExprResult Res = CorrectDelayedTyposInExpr(Init);
2858 if (!Res.isUsable())
2865 AdjustDeclIfTemplate(ConstructorD);
2867 CXXConstructorDecl *Constructor
2868 = dyn_cast<CXXConstructorDecl>(ConstructorD);
2870 // The user wrote a constructor initializer on a function that is
2871 // not a C++ constructor. Ignore the error for now, because we may
2872 // have more member initializers coming; we'll diagnose it just
2873 // once in ActOnMemInitializers.
2877 CXXRecordDecl *ClassDecl = Constructor->getParent();
2879 // C++ [class.base.init]p2:
2880 // Names in a mem-initializer-id are looked up in the scope of the
2881 // constructor's class and, if not found in that scope, are looked
2882 // up in the scope containing the constructor's definition.
2883 // [Note: if the constructor's class contains a member with the
2884 // same name as a direct or virtual base class of the class, a
2885 // mem-initializer-id naming the member or base class and composed
2886 // of a single identifier refers to the class member. A
2887 // mem-initializer-id for the hidden base class may be specified
2888 // using a qualified name. ]
2889 if (!SS.getScopeRep() && !TemplateTypeTy) {
2890 // Look for a member, first.
2891 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase);
2892 if (!Result.empty()) {
2894 if ((Member = dyn_cast<FieldDecl>(Result.front())) ||
2895 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) {
2896 if (EllipsisLoc.isValid())
2897 Diag(EllipsisLoc, diag::err_pack_expansion_member_init)
2899 << SourceRange(IdLoc, Init->getSourceRange().getEnd());
2901 return BuildMemberInitializer(Member, Init, IdLoc);
2905 // It didn't name a member, so see if it names a class.
2907 TypeSourceInfo *TInfo = nullptr;
2909 if (TemplateTypeTy) {
2910 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo);
2911 } else if (DS.getTypeSpecType() == TST_decltype) {
2912 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc());
2914 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName);
2915 LookupParsedName(R, S, &SS);
2917 TypeDecl *TyD = R.getAsSingle<TypeDecl>();
2919 if (R.isAmbiguous()) return true;
2921 // We don't want access-control diagnostics here.
2922 R.suppressDiagnostics();
2924 if (SS.isSet() && isDependentScopeSpecifier(SS)) {
2925 bool NotUnknownSpecialization = false;
2926 DeclContext *DC = computeDeclContext(SS, false);
2927 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC))
2928 NotUnknownSpecialization = !Record->hasAnyDependentBases();
2930 if (!NotUnknownSpecialization) {
2931 // When the scope specifier can refer to a member of an unknown
2932 // specialization, we take it as a type name.
2933 BaseType = CheckTypenameType(ETK_None, SourceLocation(),
2934 SS.getWithLocInContext(Context),
2935 *MemberOrBase, IdLoc);
2936 if (BaseType.isNull())
2940 R.setLookupName(MemberOrBase);
2944 // If no results were found, try to correct typos.
2945 TypoCorrection Corr;
2946 if (R.empty() && BaseType.isNull() &&
2947 (Corr = CorrectTypo(
2948 R.getLookupNameInfo(), R.getLookupKind(), S, &SS,
2949 llvm::make_unique<MemInitializerValidatorCCC>(ClassDecl),
2950 CTK_ErrorRecovery, ClassDecl))) {
2951 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) {
2952 // We have found a non-static data member with a similar
2953 // name to what was typed; complain and initialize that
2956 PDiag(diag::err_mem_init_not_member_or_class_suggest)
2957 << MemberOrBase << true);
2958 return BuildMemberInitializer(Member, Init, IdLoc);
2959 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) {
2960 const CXXBaseSpecifier *DirectBaseSpec;
2961 const CXXBaseSpecifier *VirtualBaseSpec;
2962 if (FindBaseInitializer(*this, ClassDecl,
2963 Context.getTypeDeclType(Type),
2964 DirectBaseSpec, VirtualBaseSpec)) {
2965 // We have found a direct or virtual base class with a
2966 // similar name to what was typed; complain and initialize
2969 PDiag(diag::err_mem_init_not_member_or_class_suggest)
2970 << MemberOrBase << false,
2971 PDiag() /*Suppress note, we provide our own.*/);
2973 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec ? DirectBaseSpec
2975 Diag(BaseSpec->getLocStart(),
2976 diag::note_base_class_specified_here)
2977 << BaseSpec->getType()
2978 << BaseSpec->getSourceRange();
2985 if (!TyD && BaseType.isNull()) {
2986 Diag(IdLoc, diag::err_mem_init_not_member_or_class)
2987 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd());
2992 if (BaseType.isNull()) {
2993 BaseType = Context.getTypeDeclType(TyD);
2994 MarkAnyDeclReferenced(TyD->getLocation(), TyD, /*OdrUse=*/false);
2996 BaseType = Context.getElaboratedType(ETK_None, SS.getScopeRep(),
2998 TInfo = Context.CreateTypeSourceInfo(BaseType);
2999 ElaboratedTypeLoc TL = TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>();
3000 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(IdLoc);
3001 TL.setElaboratedKeywordLoc(SourceLocation());
3002 TL.setQualifierLoc(SS.getWithLocInContext(Context));
3008 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc);
3010 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc);
3013 /// Checks a member initializer expression for cases where reference (or
3014 /// pointer) members are bound to by-value parameters (or their addresses).
3015 static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member,
3017 SourceLocation IdLoc) {
3018 QualType MemberTy = Member->getType();
3020 // We only handle pointers and references currently.
3021 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers?
3022 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType())
3025 const bool IsPointer = MemberTy->isPointerType();
3027 if (const UnaryOperator *Op
3028 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) {
3029 // The only case we're worried about with pointers requires taking the
3031 if (Op->getOpcode() != UO_AddrOf)
3034 Init = Op->getSubExpr();
3036 // We only handle address-of expression initializers for pointers.
3041 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) {
3042 // We only warn when referring to a non-reference parameter declaration.
3043 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl());
3044 if (!Parameter || Parameter->getType()->isReferenceType())
3047 S.Diag(Init->getExprLoc(),
3048 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr
3049 : diag::warn_bind_ref_member_to_parameter)
3050 << Member << Parameter << Init->getSourceRange();
3052 // Other initializers are fine.
3056 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here)
3057 << (unsigned)IsPointer;
3061 Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init,
3062 SourceLocation IdLoc) {
3063 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member);
3064 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member);
3065 assert((DirectMember || IndirectMember) &&
3066 "Member must be a FieldDecl or IndirectFieldDecl");
3068 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
3071 if (Member->isInvalidDecl())
3075 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
3076 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
3077 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) {
3078 Args = MultiExprArg(InitList->getInits(), InitList->getNumInits());
3080 // Template instantiation doesn't reconstruct ParenListExprs for us.
3084 SourceRange InitRange = Init->getSourceRange();
3086 if (Member->getType()->isDependentType() || Init->isTypeDependent()) {
3087 // Can't check initialization for a member of dependent type or when
3088 // any of the arguments are type-dependent expressions.
3089 DiscardCleanupsInEvaluationContext();
3091 bool InitList = false;
3092 if (isa<InitListExpr>(Init)) {
3097 // Initialize the member.
3098 InitializedEntity MemberEntity =
3099 DirectMember ? InitializedEntity::InitializeMember(DirectMember, nullptr)
3100 : InitializedEntity::InitializeMember(IndirectMember,
3102 InitializationKind Kind =
3103 InitList ? InitializationKind::CreateDirectList(IdLoc)
3104 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(),
3105 InitRange.getEnd());
3107 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args);
3108 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args,
3110 if (MemberInit.isInvalid())
3113 CheckForDanglingReferenceOrPointer(*this, Member, MemberInit.get(), IdLoc);
3115 // C++11 [class.base.init]p7:
3116 // The initialization of each base and member constitutes a
3118 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin());
3119 if (MemberInit.isInvalid())
3122 Init = MemberInit.get();
3126 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc,
3127 InitRange.getBegin(), Init,
3128 InitRange.getEnd());
3130 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc,
3131 InitRange.getBegin(), Init,
3132 InitRange.getEnd());
3137 Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init,
3138 CXXRecordDecl *ClassDecl) {
3139 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin();
3140 if (!LangOpts.CPlusPlus11)
3141 return Diag(NameLoc, diag::err_delegating_ctor)
3142 << TInfo->getTypeLoc().getLocalSourceRange();
3143 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor);
3145 bool InitList = true;
3146 MultiExprArg Args = Init;
3147 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
3149 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
3152 SourceRange InitRange = Init->getSourceRange();
3153 // Initialize the object.
3154 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation(
3155 QualType(ClassDecl->getTypeForDecl(), 0));
3156 InitializationKind Kind =
3157 InitList ? InitializationKind::CreateDirectList(NameLoc)
3158 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(),
3159 InitRange.getEnd());
3160 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args);
3161 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind,
3163 if (DelegationInit.isInvalid())
3166 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() &&
3167 "Delegating constructor with no target?");
3169 // C++11 [class.base.init]p7:
3170 // The initialization of each base and member constitutes a
3172 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(),
3173 InitRange.getBegin());
3174 if (DelegationInit.isInvalid())
3177 // If we are in a dependent context, template instantiation will
3178 // perform this type-checking again. Just save the arguments that we
3179 // received in a ParenListExpr.
3180 // FIXME: This isn't quite ideal, since our ASTs don't capture all
3181 // of the information that we have about the base
3182 // initializer. However, deconstructing the ASTs is a dicey process,
3183 // and this approach is far more likely to get the corner cases right.
3184 if (CurContext->isDependentContext())
3185 DelegationInit = Init;
3187 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(),
3188 DelegationInit.getAs<Expr>(),
3189 InitRange.getEnd());
3193 Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo,
3194 Expr *Init, CXXRecordDecl *ClassDecl,
3195 SourceLocation EllipsisLoc) {
3196 SourceLocation BaseLoc
3197 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin();
3199 if (!BaseType->isDependentType() && !BaseType->isRecordType())
3200 return Diag(BaseLoc, diag::err_base_init_does_not_name_class)
3201 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
3203 // C++ [class.base.init]p2:
3204 // [...] Unless the mem-initializer-id names a nonstatic data
3205 // member of the constructor's class or a direct or virtual base
3206 // of that class, the mem-initializer is ill-formed. A
3207 // mem-initializer-list can initialize a base class using any
3208 // name that denotes that base class type.
3209 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent();
3211 SourceRange InitRange = Init->getSourceRange();
3212 if (EllipsisLoc.isValid()) {
3213 // This is a pack expansion.
3214 if (!BaseType->containsUnexpandedParameterPack()) {
3215 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
3216 << SourceRange(BaseLoc, InitRange.getEnd());
3218 EllipsisLoc = SourceLocation();
3221 // Check for any unexpanded parameter packs.
3222 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer))
3225 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer))
3229 // Check for direct and virtual base classes.
3230 const CXXBaseSpecifier *DirectBaseSpec = nullptr;
3231 const CXXBaseSpecifier *VirtualBaseSpec = nullptr;
3233 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0),
3235 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl);
3237 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec,
3240 // C++ [base.class.init]p2:
3241 // Unless the mem-initializer-id names a nonstatic data member of the
3242 // constructor's class or a direct or virtual base of that class, the
3243 // mem-initializer is ill-formed.
3244 if (!DirectBaseSpec && !VirtualBaseSpec) {
3245 // If the class has any dependent bases, then it's possible that
3246 // one of those types will resolve to the same type as
3247 // BaseType. Therefore, just treat this as a dependent base
3248 // class initialization. FIXME: Should we try to check the
3249 // initialization anyway? It seems odd.
3250 if (ClassDecl->hasAnyDependentBases())
3253 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual)
3254 << BaseType << Context.getTypeDeclType(ClassDecl)
3255 << BaseTInfo->getTypeLoc().getLocalSourceRange();
3260 DiscardCleanupsInEvaluationContext();
3262 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
3263 /*IsVirtual=*/false,
3264 InitRange.getBegin(), Init,
3265 InitRange.getEnd(), EllipsisLoc);
3268 // C++ [base.class.init]p2:
3269 // If a mem-initializer-id is ambiguous because it designates both
3270 // a direct non-virtual base class and an inherited virtual base
3271 // class, the mem-initializer is ill-formed.
3272 if (DirectBaseSpec && VirtualBaseSpec)
3273 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual)
3274 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange();
3276 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec;
3278 BaseSpec = VirtualBaseSpec;
3280 // Initialize the base.
3281 bool InitList = true;
3282 MultiExprArg Args = Init;
3283 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
3285 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs());
3288 InitializedEntity BaseEntity =
3289 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec);
3290 InitializationKind Kind =
3291 InitList ? InitializationKind::CreateDirectList(BaseLoc)
3292 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(),
3293 InitRange.getEnd());
3294 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args);
3295 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, nullptr);
3296 if (BaseInit.isInvalid())
3299 // C++11 [class.base.init]p7:
3300 // The initialization of each base and member constitutes a
3302 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin());
3303 if (BaseInit.isInvalid())
3306 // If we are in a dependent context, template instantiation will
3307 // perform this type-checking again. Just save the arguments that we
3308 // received in a ParenListExpr.
3309 // FIXME: This isn't quite ideal, since our ASTs don't capture all
3310 // of the information that we have about the base
3311 // initializer. However, deconstructing the ASTs is a dicey process,
3312 // and this approach is far more likely to get the corner cases right.
3313 if (CurContext->isDependentContext())
3316 return new (Context) CXXCtorInitializer(Context, BaseTInfo,
3317 BaseSpec->isVirtual(),
3318 InitRange.getBegin(),
3319 BaseInit.getAs<Expr>(),
3320 InitRange.getEnd(), EllipsisLoc);
3323 // Create a static_cast\<T&&>(expr).
3324 static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) {
3325 if (T.isNull()) T = E->getType();
3326 QualType TargetType = SemaRef.BuildReferenceType(
3327 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName());
3328 SourceLocation ExprLoc = E->getLocStart();
3329 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo(
3330 TargetType, ExprLoc);
3332 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E,
3333 SourceRange(ExprLoc, ExprLoc),
3334 E->getSourceRange()).get();
3337 /// ImplicitInitializerKind - How an implicit base or member initializer should
3338 /// initialize its base or member.
3339 enum ImplicitInitializerKind {
3347 BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
3348 ImplicitInitializerKind ImplicitInitKind,
3349 CXXBaseSpecifier *BaseSpec,
3350 bool IsInheritedVirtualBase,
3351 CXXCtorInitializer *&CXXBaseInit) {
3352 InitializedEntity InitEntity
3353 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec,
3354 IsInheritedVirtualBase);
3356 ExprResult BaseInit;
3358 switch (ImplicitInitKind) {
3361 InitializationKind InitKind
3362 = InitializationKind::CreateDefault(Constructor->getLocation());
3363 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None);
3364 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None);
3370 bool Moving = ImplicitInitKind == IIK_Move;
3371 ParmVarDecl *Param = Constructor->getParamDecl(0);
3372 QualType ParamType = Param->getType().getNonReferenceType();
3375 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
3376 SourceLocation(), Param, false,
3377 Constructor->getLocation(), ParamType,
3378 VK_LValue, nullptr);
3380 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg));
3382 // Cast to the base class to avoid ambiguities.
3384 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(),
3385 ParamType.getQualifiers());
3388 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg);
3391 CXXCastPath BasePath;
3392 BasePath.push_back(BaseSpec);
3393 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy,
3394 CK_UncheckedDerivedToBase,
3395 Moving ? VK_XValue : VK_LValue,
3398 InitializationKind InitKind
3399 = InitializationKind::CreateDirect(Constructor->getLocation(),
3400 SourceLocation(), SourceLocation());
3401 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg);
3402 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg);
3407 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit);
3408 if (BaseInit.isInvalid())
3412 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
3413 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(),
3415 BaseSpec->isVirtual(),
3417 BaseInit.getAs<Expr>(),
3424 static bool RefersToRValueRef(Expr *MemRef) {
3425 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl();
3426 return Referenced->getType()->isRValueReferenceType();
3430 BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor,
3431 ImplicitInitializerKind ImplicitInitKind,
3432 FieldDecl *Field, IndirectFieldDecl *Indirect,
3433 CXXCtorInitializer *&CXXMemberInit) {
3434 if (Field->isInvalidDecl())
3437 SourceLocation Loc = Constructor->getLocation();
3439 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) {
3440 bool Moving = ImplicitInitKind == IIK_Move;
3441 ParmVarDecl *Param = Constructor->getParamDecl(0);
3442 QualType ParamType = Param->getType().getNonReferenceType();
3444 // Suppress copying zero-width bitfields.
3445 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0)
3448 Expr *MemberExprBase =
3449 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
3450 SourceLocation(), Param, false,
3451 Loc, ParamType, VK_LValue, nullptr);
3453 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase));
3456 MemberExprBase = CastForMoving(SemaRef, MemberExprBase);
3459 // Build a reference to this field within the parameter.
3461 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc,
3462 Sema::LookupMemberName);
3463 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect)
3464 : cast<ValueDecl>(Field), AS_public);
3465 MemberLookup.resolveKind();
3467 = SemaRef.BuildMemberReferenceExpr(MemberExprBase,
3471 /*TemplateKWLoc=*/SourceLocation(),
3472 /*FirstQualifierInScope=*/nullptr,
3474 /*TemplateArgs=*/nullptr,
3476 if (CtorArg.isInvalid())
3479 // C++11 [class.copy]p15:
3480 // - if a member m has rvalue reference type T&&, it is direct-initialized
3481 // with static_cast<T&&>(x.m);
3482 if (RefersToRValueRef(CtorArg.get())) {
3483 CtorArg = CastForMoving(SemaRef, CtorArg.get());
3486 // When the field we are copying is an array, create index variables for
3487 // each dimension of the array. We use these index variables to subscript
3488 // the source array, and other clients (e.g., CodeGen) will perform the
3489 // necessary iteration with these index variables.
3490 SmallVector<VarDecl *, 4> IndexVariables;
3491 QualType BaseType = Field->getType();
3492 QualType SizeType = SemaRef.Context.getSizeType();
3493 bool InitializingArray = false;
3494 while (const ConstantArrayType *Array
3495 = SemaRef.Context.getAsConstantArrayType(BaseType)) {
3496 InitializingArray = true;
3497 // Create the iteration variable for this array index.
3498 IdentifierInfo *IterationVarName = nullptr;
3501 llvm::raw_svector_ostream OS(Str);
3502 OS << "__i" << IndexVariables.size();
3503 IterationVarName = &SemaRef.Context.Idents.get(OS.str());
3505 VarDecl *IterationVar
3506 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc,
3507 IterationVarName, SizeType,
3508 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc),
3510 IndexVariables.push_back(IterationVar);
3512 // Create a reference to the iteration variable.
3513 ExprResult IterationVarRef
3514 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc);
3515 assert(!IterationVarRef.isInvalid() &&
3516 "Reference to invented variable cannot fail!");
3517 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.get());
3518 assert(!IterationVarRef.isInvalid() &&
3519 "Conversion of invented variable cannot fail!");
3521 // Subscript the array with this iteration variable.
3522 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.get(), Loc,
3523 IterationVarRef.get(),
3525 if (CtorArg.isInvalid())
3528 BaseType = Array->getElementType();
3531 // The array subscript expression is an lvalue, which is wrong for moving.
3532 if (Moving && InitializingArray)
3533 CtorArg = CastForMoving(SemaRef, CtorArg.get());
3535 // Construct the entity that we will be initializing. For an array, this
3536 // will be first element in the array, which may require several levels
3537 // of array-subscript entities.
3538 SmallVector<InitializedEntity, 4> Entities;
3539 Entities.reserve(1 + IndexVariables.size());
3541 Entities.push_back(InitializedEntity::InitializeMember(Indirect));
3543 Entities.push_back(InitializedEntity::InitializeMember(Field));
3544 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I)
3545 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context,
3549 // Direct-initialize to use the copy constructor.
3550 InitializationKind InitKind =
3551 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation());
3553 Expr *CtorArgE = CtorArg.getAs<Expr>();
3554 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind,
3557 ExprResult MemberInit
3558 = InitSeq.Perform(SemaRef, Entities.back(), InitKind,
3559 MultiExprArg(&CtorArgE, 1));
3560 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
3561 if (MemberInit.isInvalid())
3565 assert(IndexVariables.size() == 0 &&
3566 "Indirect field improperly initialized");
3568 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect,
3570 MemberInit.getAs<Expr>(),
3573 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc,
3574 Loc, MemberInit.getAs<Expr>(),
3576 IndexVariables.data(),
3577 IndexVariables.size());
3581 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) &&
3582 "Unhandled implicit init kind!");
3584 QualType FieldBaseElementType =
3585 SemaRef.Context.getBaseElementType(Field->getType());
3587 if (FieldBaseElementType->isRecordType()) {
3588 InitializedEntity InitEntity
3589 = Indirect? InitializedEntity::InitializeMember(Indirect)
3590 : InitializedEntity::InitializeMember(Field);
3591 InitializationKind InitKind =
3592 InitializationKind::CreateDefault(Loc);
3594 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None);
3595 ExprResult MemberInit =
3596 InitSeq.Perform(SemaRef, InitEntity, InitKind, None);
3598 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit);
3599 if (MemberInit.isInvalid())
3603 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
3609 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context,
3616 if (!Field->getParent()->isUnion()) {
3617 if (FieldBaseElementType->isReferenceType()) {
3618 SemaRef.Diag(Constructor->getLocation(),
3619 diag::err_uninitialized_member_in_ctor)
3620 << (int)Constructor->isImplicit()
3621 << SemaRef.Context.getTagDeclType(Constructor->getParent())
3622 << 0 << Field->getDeclName();
3623 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
3627 if (FieldBaseElementType.isConstQualified()) {
3628 SemaRef.Diag(Constructor->getLocation(),
3629 diag::err_uninitialized_member_in_ctor)
3630 << (int)Constructor->isImplicit()
3631 << SemaRef.Context.getTagDeclType(Constructor->getParent())
3632 << 1 << Field->getDeclName();
3633 SemaRef.Diag(Field->getLocation(), diag::note_declared_at);
3638 if (SemaRef.getLangOpts().ObjCAutoRefCount &&
3639 FieldBaseElementType->isObjCRetainableType() &&
3640 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None &&
3641 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) {
3643 // Default-initialize Objective-C pointers to NULL.
3645 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field,
3647 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()),
3652 // Nothing to initialize.
3653 CXXMemberInit = nullptr;
3658 struct BaseAndFieldInfo {
3660 CXXConstructorDecl *Ctor;
3661 bool AnyErrorsInInits;
3662 ImplicitInitializerKind IIK;
3663 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields;
3664 SmallVector<CXXCtorInitializer*, 8> AllToInit;
3665 llvm::DenseMap<TagDecl*, FieldDecl*> ActiveUnionMember;
3667 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits)
3668 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) {
3669 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted();
3670 if (Ctor->getInheritedConstructor())
3672 else if (Generated && Ctor->isCopyConstructor())
3674 else if (Generated && Ctor->isMoveConstructor())
3680 bool isImplicitCopyOrMove() const {
3691 llvm_unreachable("Invalid ImplicitInitializerKind!");
3694 bool addFieldInitializer(CXXCtorInitializer *Init) {
3695 AllToInit.push_back(Init);
3697 // Check whether this initializer makes the field "used".
3698 if (Init->getInit()->HasSideEffects(S.Context))
3699 S.UnusedPrivateFields.remove(Init->getAnyMember());
3704 bool isInactiveUnionMember(FieldDecl *Field) {
3705 RecordDecl *Record = Field->getParent();
3706 if (!Record->isUnion())
3709 if (FieldDecl *Active =
3710 ActiveUnionMember.lookup(Record->getCanonicalDecl()))
3711 return Active != Field->getCanonicalDecl();
3713 // In an implicit copy or move constructor, ignore any in-class initializer.
3714 if (isImplicitCopyOrMove())
3717 // If there's no explicit initialization, the field is active only if it
3718 // has an in-class initializer...
3719 if (Field->hasInClassInitializer())
3721 // ... or it's an anonymous struct or union whose class has an in-class
3723 if (!Field->isAnonymousStructOrUnion())
3725 CXXRecordDecl *FieldRD = Field->getType()->getAsCXXRecordDecl();
3726 return !FieldRD->hasInClassInitializer();
3729 /// \brief Determine whether the given field is, or is within, a union member
3730 /// that is inactive (because there was an initializer given for a different
3731 /// member of the union, or because the union was not initialized at all).
3732 bool isWithinInactiveUnionMember(FieldDecl *Field,
3733 IndirectFieldDecl *Indirect) {
3735 return isInactiveUnionMember(Field);
3737 for (auto *C : Indirect->chain()) {
3738 FieldDecl *Field = dyn_cast<FieldDecl>(C);
3739 if (Field && isInactiveUnionMember(Field))
3747 /// \brief Determine whether the given type is an incomplete or zero-lenfgth
3749 static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) {
3750 if (T->isIncompleteArrayType())
3753 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) {
3754 if (!ArrayT->getSize())
3757 T = ArrayT->getElementType();
3763 static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info,
3765 IndirectFieldDecl *Indirect = nullptr) {
3766 if (Field->isInvalidDecl())
3769 // Overwhelmingly common case: we have a direct initializer for this field.
3770 if (CXXCtorInitializer *Init =
3771 Info.AllBaseFields.lookup(Field->getCanonicalDecl()))
3772 return Info.addFieldInitializer(Init);
3774 // C++11 [class.base.init]p8:
3775 // if the entity is a non-static data member that has a
3776 // brace-or-equal-initializer and either
3777 // -- the constructor's class is a union and no other variant member of that
3778 // union is designated by a mem-initializer-id or
3779 // -- the constructor's class is not a union, and, if the entity is a member
3780 // of an anonymous union, no other member of that union is designated by
3781 // a mem-initializer-id,
3782 // the entity is initialized as specified in [dcl.init].
3784 // We also apply the same rules to handle anonymous structs within anonymous
3786 if (Info.isWithinInactiveUnionMember(Field, Indirect))
3789 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) {
3791 SemaRef.BuildCXXDefaultInitExpr(Info.Ctor->getLocation(), Field);
3792 if (DIE.isInvalid())
3794 CXXCtorInitializer *Init;
3796 Init = new (SemaRef.Context)
3797 CXXCtorInitializer(SemaRef.Context, Indirect, SourceLocation(),
3798 SourceLocation(), DIE.get(), SourceLocation());
3800 Init = new (SemaRef.Context)
3801 CXXCtorInitializer(SemaRef.Context, Field, SourceLocation(),
3802 SourceLocation(), DIE.get(), SourceLocation());
3803 return Info.addFieldInitializer(Init);
3806 // Don't initialize incomplete or zero-length arrays.
3807 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType()))
3810 // Don't try to build an implicit initializer if there were semantic
3811 // errors in any of the initializers (and therefore we might be
3812 // missing some that the user actually wrote).
3813 if (Info.AnyErrorsInInits)
3816 CXXCtorInitializer *Init = nullptr;
3817 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field,
3824 return Info.addFieldInitializer(Init);
3828 Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor,
3829 CXXCtorInitializer *Initializer) {
3830 assert(Initializer->isDelegatingInitializer());
3831 Constructor->setNumCtorInitializers(1);
3832 CXXCtorInitializer **initializer =
3833 new (Context) CXXCtorInitializer*[1];
3834 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*));
3835 Constructor->setCtorInitializers(initializer);
3837 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) {
3838 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor);
3839 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation());
3842 DelegatingCtorDecls.push_back(Constructor);
3844 DiagnoseUninitializedFields(*this, Constructor);
3849 bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors,
3850 ArrayRef<CXXCtorInitializer *> Initializers) {
3851 if (Constructor->isDependentContext()) {
3852 // Just store the initializers as written, they will be checked during
3854 if (!Initializers.empty()) {
3855 Constructor->setNumCtorInitializers(Initializers.size());
3856 CXXCtorInitializer **baseOrMemberInitializers =
3857 new (Context) CXXCtorInitializer*[Initializers.size()];
3858 memcpy(baseOrMemberInitializers, Initializers.data(),
3859 Initializers.size() * sizeof(CXXCtorInitializer*));
3860 Constructor->setCtorInitializers(baseOrMemberInitializers);
3863 // Let template instantiation know whether we had errors.
3865 Constructor->setInvalidDecl();
3870 BaseAndFieldInfo Info(*this, Constructor, AnyErrors);
3872 // We need to build the initializer AST according to order of construction
3873 // and not what user specified in the Initializers list.
3874 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition();
3878 bool HadError = false;
3880 for (unsigned i = 0; i < Initializers.size(); i++) {
3881 CXXCtorInitializer *Member = Initializers[i];
3883 if (Member->isBaseInitializer())
3884 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member;
3886 Info.AllBaseFields[Member->getAnyMember()->getCanonicalDecl()] = Member;
3888 if (IndirectFieldDecl *F = Member->getIndirectMember()) {
3889 for (auto *C : F->chain()) {
3890 FieldDecl *FD = dyn_cast<FieldDecl>(C);
3891 if (FD && FD->getParent()->isUnion())
3892 Info.ActiveUnionMember.insert(std::make_pair(
3893 FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl()));
3895 } else if (FieldDecl *FD = Member->getMember()) {
3896 if (FD->getParent()->isUnion())
3897 Info.ActiveUnionMember.insert(std::make_pair(
3898 FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl()));
3903 // Keep track of the direct virtual bases.
3904 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases;
3905 for (auto &I : ClassDecl->bases()) {
3907 DirectVBases.insert(&I);
3910 // Push virtual bases before others.
3911 for (auto &VBase : ClassDecl->vbases()) {
3912 if (CXXCtorInitializer *Value
3913 = Info.AllBaseFields.lookup(VBase.getType()->getAs<RecordType>())) {
3914 // [class.base.init]p7, per DR257:
3915 // A mem-initializer where the mem-initializer-id names a virtual base
3916 // class is ignored during execution of a constructor of any class that
3917 // is not the most derived class.
3918 if (ClassDecl->isAbstract()) {
3919 // FIXME: Provide a fixit to remove the base specifier. This requires
3920 // tracking the location of the associated comma for a base specifier.
3921 Diag(Value->getSourceLocation(), diag::warn_abstract_vbase_init_ignored)
3922 << VBase.getType() << ClassDecl;
3923 DiagnoseAbstractType(ClassDecl);
3926 Info.AllToInit.push_back(Value);
3927 } else if (!AnyErrors && !ClassDecl->isAbstract()) {
3928 // [class.base.init]p8, per DR257:
3929 // If a given [...] base class is not named by a mem-initializer-id
3930 // [...] and the entity is not a virtual base class of an abstract
3931 // class, then [...] the entity is default-initialized.
3932 bool IsInheritedVirtualBase = !DirectVBases.count(&VBase);
3933 CXXCtorInitializer *CXXBaseInit;
3934 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
3935 &VBase, IsInheritedVirtualBase,
3941 Info.AllToInit.push_back(CXXBaseInit);
3945 // Non-virtual bases.
3946 for (auto &Base : ClassDecl->bases()) {
3947 // Virtuals are in the virtual base list and already constructed.
3948 if (Base.isVirtual())
3951 if (CXXCtorInitializer *Value
3952 = Info.AllBaseFields.lookup(Base.getType()->getAs<RecordType>())) {
3953 Info.AllToInit.push_back(Value);
3954 } else if (!AnyErrors) {
3955 CXXCtorInitializer *CXXBaseInit;
3956 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK,
3957 &Base, /*IsInheritedVirtualBase=*/false,
3963 Info.AllToInit.push_back(CXXBaseInit);
3968 for (auto *Mem : ClassDecl->decls()) {
3969 if (auto *F = dyn_cast<FieldDecl>(Mem)) {
3970 // C++ [class.bit]p2:
3971 // A declaration for a bit-field that omits the identifier declares an
3972 // unnamed bit-field. Unnamed bit-fields are not members and cannot be
3974 if (F->isUnnamedBitfield())
3977 // If we're not generating the implicit copy/move constructor, then we'll
3978 // handle anonymous struct/union fields based on their individual
3980 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove())
3983 if (CollectFieldInitializer(*this, Info, F))
3988 // Beyond this point, we only consider default initialization.
3989 if (Info.isImplicitCopyOrMove())
3992 if (auto *F = dyn_cast<IndirectFieldDecl>(Mem)) {
3993 if (F->getType()->isIncompleteArrayType()) {
3994 assert(ClassDecl->hasFlexibleArrayMember() &&
3995 "Incomplete array type is not valid");
3999 // Initialize each field of an anonymous struct individually.
4000 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F))
4007 unsigned NumInitializers = Info.AllToInit.size();
4008 if (NumInitializers > 0) {
4009 Constructor->setNumCtorInitializers(NumInitializers);
4010 CXXCtorInitializer **baseOrMemberInitializers =
4011 new (Context) CXXCtorInitializer*[NumInitializers];
4012 memcpy(baseOrMemberInitializers, Info.AllToInit.data(),
4013 NumInitializers * sizeof(CXXCtorInitializer*));
4014 Constructor->setCtorInitializers(baseOrMemberInitializers);
4016 // Constructors implicitly reference the base and member
4018 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(),
4019 Constructor->getParent());
4025 static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) {
4026 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) {
4027 const RecordDecl *RD = RT->getDecl();
4028 if (RD->isAnonymousStructOrUnion()) {
4029 for (auto *Field : RD->fields())
4030 PopulateKeysForFields(Field, IdealInits);
4034 IdealInits.push_back(Field->getCanonicalDecl());
4037 static const void *GetKeyForBase(ASTContext &Context, QualType BaseType) {
4038 return Context.getCanonicalType(BaseType).getTypePtr();
4041 static const void *GetKeyForMember(ASTContext &Context,
4042 CXXCtorInitializer *Member) {
4043 if (!Member->isAnyMemberInitializer())
4044 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0));
4046 return Member->getAnyMember()->getCanonicalDecl();
4049 static void DiagnoseBaseOrMemInitializerOrder(
4050 Sema &SemaRef, const CXXConstructorDecl *Constructor,
4051 ArrayRef<CXXCtorInitializer *> Inits) {
4052 if (Constructor->getDeclContext()->isDependentContext())
4055 // Don't check initializers order unless the warning is enabled at the
4056 // location of at least one initializer.
4057 bool ShouldCheckOrder = false;
4058 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) {
4059 CXXCtorInitializer *Init = Inits[InitIndex];
4060 if (!SemaRef.Diags.isIgnored(diag::warn_initializer_out_of_order,
4061 Init->getSourceLocation())) {
4062 ShouldCheckOrder = true;
4066 if (!ShouldCheckOrder)
4069 // Build the list of bases and members in the order that they'll
4070 // actually be initialized. The explicit initializers should be in
4071 // this same order but may be missing things.
4072 SmallVector<const void*, 32> IdealInitKeys;
4074 const CXXRecordDecl *ClassDecl = Constructor->getParent();
4076 // 1. Virtual bases.
4077 for (const auto &VBase : ClassDecl->vbases())
4078 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase.getType()));
4080 // 2. Non-virtual bases.
4081 for (const auto &Base : ClassDecl->bases()) {
4082 if (Base.isVirtual())
4084 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base.getType()));
4087 // 3. Direct fields.
4088 for (auto *Field : ClassDecl->fields()) {
4089 if (Field->isUnnamedBitfield())
4092 PopulateKeysForFields(Field, IdealInitKeys);
4095 unsigned NumIdealInits = IdealInitKeys.size();
4096 unsigned IdealIndex = 0;
4098 CXXCtorInitializer *PrevInit = nullptr;
4099 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) {
4100 CXXCtorInitializer *Init = Inits[InitIndex];
4101 const void *InitKey = GetKeyForMember(SemaRef.Context, Init);
4103 // Scan forward to try to find this initializer in the idealized
4104 // initializers list.
4105 for (; IdealIndex != NumIdealInits; ++IdealIndex)
4106 if (InitKey == IdealInitKeys[IdealIndex])
4109 // If we didn't find this initializer, it must be because we
4110 // scanned past it on a previous iteration. That can only
4111 // happen if we're out of order; emit a warning.
4112 if (IdealIndex == NumIdealInits && PrevInit) {
4113 Sema::SemaDiagnosticBuilder D =
4114 SemaRef.Diag(PrevInit->getSourceLocation(),
4115 diag::warn_initializer_out_of_order);
4117 if (PrevInit->isAnyMemberInitializer())
4118 D << 0 << PrevInit->getAnyMember()->getDeclName();
4120 D << 1 << PrevInit->getTypeSourceInfo()->getType();
4122 if (Init->isAnyMemberInitializer())
4123 D << 0 << Init->getAnyMember()->getDeclName();
4125 D << 1 << Init->getTypeSourceInfo()->getType();
4127 // Move back to the initializer's location in the ideal list.
4128 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex)
4129 if (InitKey == IdealInitKeys[IdealIndex])
4132 assert(IdealIndex < NumIdealInits &&
4133 "initializer not found in initializer list");
4141 bool CheckRedundantInit(Sema &S,
4142 CXXCtorInitializer *Init,
4143 CXXCtorInitializer *&PrevInit) {
4149 if (FieldDecl *Field = Init->getAnyMember())
4150 S.Diag(Init->getSourceLocation(),
4151 diag::err_multiple_mem_initialization)
4152 << Field->getDeclName()
4153 << Init->getSourceRange();
4155 const Type *BaseClass = Init->getBaseClass();
4156 assert(BaseClass && "neither field nor base");
4157 S.Diag(Init->getSourceLocation(),
4158 diag::err_multiple_base_initialization)
4159 << QualType(BaseClass, 0)
4160 << Init->getSourceRange();
4162 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer)
4163 << 0 << PrevInit->getSourceRange();
4168 typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry;
4169 typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap;
4171 bool CheckRedundantUnionInit(Sema &S,
4172 CXXCtorInitializer *Init,
4173 RedundantUnionMap &Unions) {
4174 FieldDecl *Field = Init->getAnyMember();
4175 RecordDecl *Parent = Field->getParent();
4176 NamedDecl *Child = Field;
4178 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) {
4179 if (Parent->isUnion()) {
4180 UnionEntry &En = Unions[Parent];
4181 if (En.first && En.first != Child) {
4182 S.Diag(Init->getSourceLocation(),
4183 diag::err_multiple_mem_union_initialization)
4184 << Field->getDeclName()
4185 << Init->getSourceRange();
4186 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer)
4187 << 0 << En.second->getSourceRange();
4194 if (!Parent->isAnonymousStructOrUnion())
4199 Parent = cast<RecordDecl>(Parent->getDeclContext());
4206 /// ActOnMemInitializers - Handle the member initializers for a constructor.
4207 void Sema::ActOnMemInitializers(Decl *ConstructorDecl,
4208 SourceLocation ColonLoc,
4209 ArrayRef<CXXCtorInitializer*> MemInits,
4211 if (!ConstructorDecl)
4214 AdjustDeclIfTemplate(ConstructorDecl);
4216 CXXConstructorDecl *Constructor
4217 = dyn_cast<CXXConstructorDecl>(ConstructorDecl);
4220 Diag(ColonLoc, diag::err_only_constructors_take_base_inits);
4224 // Mapping for the duplicate initializers check.
4225 // For member initializers, this is keyed with a FieldDecl*.
4226 // For base initializers, this is keyed with a Type*.
4227 llvm::DenseMap<const void *, CXXCtorInitializer *> Members;
4229 // Mapping for the inconsistent anonymous-union initializers check.
4230 RedundantUnionMap MemberUnions;
4232 bool HadError = false;
4233 for (unsigned i = 0; i < MemInits.size(); i++) {
4234 CXXCtorInitializer *Init = MemInits[i];
4236 // Set the source order index.
4237 Init->setSourceOrder(i);
4239 if (Init->isAnyMemberInitializer()) {
4240 const void *Key = GetKeyForMember(Context, Init);
4241 if (CheckRedundantInit(*this, Init, Members[Key]) ||
4242 CheckRedundantUnionInit(*this, Init, MemberUnions))
4244 } else if (Init->isBaseInitializer()) {
4245 const void *Key = GetKeyForMember(Context, Init);
4246 if (CheckRedundantInit(*this, Init, Members[Key]))
4249 assert(Init->isDelegatingInitializer());
4250 // This must be the only initializer
4251 if (MemInits.size() != 1) {
4252 Diag(Init->getSourceLocation(),
4253 diag::err_delegating_initializer_alone)
4254 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange();
4255 // We will treat this as being the only initializer.
4257 SetDelegatingInitializer(Constructor, MemInits[i]);
4258 // Return immediately as the initializer is set.
4266 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits);
4268 SetCtorInitializers(Constructor, AnyErrors, MemInits);
4270 DiagnoseUninitializedFields(*this, Constructor);
4274 Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location,
4275 CXXRecordDecl *ClassDecl) {
4276 // Ignore dependent contexts. Also ignore unions, since their members never
4277 // have destructors implicitly called.
4278 if (ClassDecl->isDependentContext() || ClassDecl->isUnion())
4281 // FIXME: all the access-control diagnostics are positioned on the
4282 // field/base declaration. That's probably good; that said, the
4283 // user might reasonably want to know why the destructor is being
4284 // emitted, and we currently don't say.
4286 // Non-static data members.
4287 for (auto *Field : ClassDecl->fields()) {
4288 if (Field->isInvalidDecl())
4291 // Don't destroy incomplete or zero-length arrays.
4292 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType()))
4295 QualType FieldType = Context.getBaseElementType(Field->getType());
4297 const RecordType* RT = FieldType->getAs<RecordType>();
4301 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
4302 if (FieldClassDecl->isInvalidDecl())
4304 if (FieldClassDecl->hasIrrelevantDestructor())
4306 // The destructor for an implicit anonymous union member is never invoked.
4307 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion())
4310 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl);
4311 assert(Dtor && "No dtor found for FieldClassDecl!");
4312 CheckDestructorAccess(Field->getLocation(), Dtor,
4313 PDiag(diag::err_access_dtor_field)
4314 << Field->getDeclName()
4317 MarkFunctionReferenced(Location, Dtor);
4318 DiagnoseUseOfDecl(Dtor, Location);
4321 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases;
4324 for (const auto &Base : ClassDecl->bases()) {
4325 // Bases are always records in a well-formed non-dependent class.
4326 const RecordType *RT = Base.getType()->getAs<RecordType>();
4328 // Remember direct virtual bases.
4329 if (Base.isVirtual())
4330 DirectVirtualBases.insert(RT);
4332 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
4333 // If our base class is invalid, we probably can't get its dtor anyway.
4334 if (BaseClassDecl->isInvalidDecl())
4336 if (BaseClassDecl->hasIrrelevantDestructor())
4339 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
4340 assert(Dtor && "No dtor found for BaseClassDecl!");
4342 // FIXME: caret should be on the start of the class name
4343 CheckDestructorAccess(Base.getLocStart(), Dtor,
4344 PDiag(diag::err_access_dtor_base)
4346 << Base.getSourceRange(),
4347 Context.getTypeDeclType(ClassDecl));
4349 MarkFunctionReferenced(Location, Dtor);
4350 DiagnoseUseOfDecl(Dtor, Location);
4354 for (const auto &VBase : ClassDecl->vbases()) {
4355 // Bases are always records in a well-formed non-dependent class.
4356 const RecordType *RT = VBase.getType()->castAs<RecordType>();
4358 // Ignore direct virtual bases.
4359 if (DirectVirtualBases.count(RT))
4362 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl());
4363 // If our base class is invalid, we probably can't get its dtor anyway.
4364 if (BaseClassDecl->isInvalidDecl())
4366 if (BaseClassDecl->hasIrrelevantDestructor())
4369 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl);
4370 assert(Dtor && "No dtor found for BaseClassDecl!");
4371 if (CheckDestructorAccess(
4372 ClassDecl->getLocation(), Dtor,
4373 PDiag(diag::err_access_dtor_vbase)
4374 << Context.getTypeDeclType(ClassDecl) << VBase.getType(),
4375 Context.getTypeDeclType(ClassDecl)) ==
4377 CheckDerivedToBaseConversion(
4378 Context.getTypeDeclType(ClassDecl), VBase.getType(),
4379 diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(),
4380 SourceRange(), DeclarationName(), nullptr);
4383 MarkFunctionReferenced(Location, Dtor);
4384 DiagnoseUseOfDecl(Dtor, Location);
4388 void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) {
4392 if (CXXConstructorDecl *Constructor
4393 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) {
4394 SetCtorInitializers(Constructor, /*AnyErrors=*/false);
4395 DiagnoseUninitializedFields(*this, Constructor);
4399 bool Sema::isAbstractType(SourceLocation Loc, QualType T) {
4400 if (!getLangOpts().CPlusPlus)
4403 const auto *RD = Context.getBaseElementType(T)->getAsCXXRecordDecl();
4407 // FIXME: Per [temp.inst]p1, we are supposed to trigger instantiation of a
4408 // class template specialization here, but doing so breaks a lot of code.
4410 // We can't answer whether something is abstract until it has a
4411 // definition. If it's currently being defined, we'll walk back
4412 // over all the declarations when we have a full definition.
4413 const CXXRecordDecl *Def = RD->getDefinition();
4414 if (!Def || Def->isBeingDefined())
4417 return RD->isAbstract();
4420 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
4421 TypeDiagnoser &Diagnoser) {
4422 if (!isAbstractType(Loc, T))
4425 T = Context.getBaseElementType(T);
4426 Diagnoser.diagnose(*this, Loc, T);
4427 DiagnoseAbstractType(T->getAsCXXRecordDecl());
4431 void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) {
4432 // Check if we've already emitted the list of pure virtual functions
4434 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD))
4437 // If the diagnostic is suppressed, don't emit the notes. We're only
4438 // going to emit them once, so try to attach them to a diagnostic we're
4439 // actually going to show.
4440 if (Diags.isLastDiagnosticIgnored())
4443 CXXFinalOverriderMap FinalOverriders;
4444 RD->getFinalOverriders(FinalOverriders);
4446 // Keep a set of seen pure methods so we won't diagnose the same method
4448 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods;
4450 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
4451 MEnd = FinalOverriders.end();
4454 for (OverridingMethods::iterator SO = M->second.begin(),
4455 SOEnd = M->second.end();
4456 SO != SOEnd; ++SO) {
4457 // C++ [class.abstract]p4:
4458 // A class is abstract if it contains or inherits at least one
4459 // pure virtual function for which the final overrider is pure
4463 if (SO->second.size() != 1)
4466 if (!SO->second.front().Method->isPure())
4469 if (!SeenPureMethods.insert(SO->second.front().Method).second)
4472 Diag(SO->second.front().Method->getLocation(),
4473 diag::note_pure_virtual_function)
4474 << SO->second.front().Method->getDeclName() << RD->getDeclName();
4478 if (!PureVirtualClassDiagSet)
4479 PureVirtualClassDiagSet.reset(new RecordDeclSetTy);
4480 PureVirtualClassDiagSet->insert(RD);
4484 struct AbstractUsageInfo {
4486 CXXRecordDecl *Record;
4487 CanQualType AbstractType;
4490 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record)
4491 : S(S), Record(Record),
4492 AbstractType(S.Context.getCanonicalType(
4493 S.Context.getTypeDeclType(Record))),
4496 void DiagnoseAbstractType() {
4497 if (Invalid) return;
4498 S.DiagnoseAbstractType(Record);
4502 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel);
4505 struct CheckAbstractUsage {
4506 AbstractUsageInfo &Info;
4507 const NamedDecl *Ctx;
4509 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx)
4510 : Info(Info), Ctx(Ctx) {}
4512 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
4513 switch (TL.getTypeLocClass()) {
4514 #define ABSTRACT_TYPELOC(CLASS, PARENT)
4515 #define TYPELOC(CLASS, PARENT) \
4516 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break;
4517 #include "clang/AST/TypeLocNodes.def"
4521 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) {
4522 Visit(TL.getReturnLoc(), Sema::AbstractReturnType);
4523 for (unsigned I = 0, E = TL.getNumParams(); I != E; ++I) {
4524 if (!TL.getParam(I))
4527 TypeSourceInfo *TSI = TL.getParam(I)->getTypeSourceInfo();
4528 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType);
4532 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) {
4533 Visit(TL.getElementLoc(), Sema::AbstractArrayType);
4536 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) {
4537 // Visit the type parameters from a permissive context.
4538 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
4539 TemplateArgumentLoc TAL = TL.getArgLoc(I);
4540 if (TAL.getArgument().getKind() == TemplateArgument::Type)
4541 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo())
4542 Visit(TSI->getTypeLoc(), Sema::AbstractNone);
4543 // TODO: other template argument types?
4547 // Visit pointee types from a permissive context.
4548 #define CheckPolymorphic(Type) \
4549 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \
4550 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \
4552 CheckPolymorphic(PointerTypeLoc)
4553 CheckPolymorphic(ReferenceTypeLoc)
4554 CheckPolymorphic(MemberPointerTypeLoc)
4555 CheckPolymorphic(BlockPointerTypeLoc)
4556 CheckPolymorphic(AtomicTypeLoc)
4558 /// Handle all the types we haven't given a more specific
4559 /// implementation for above.
4560 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) {
4561 // Every other kind of type that we haven't called out already
4562 // that has an inner type is either (1) sugar or (2) contains that
4563 // inner type in some way as a subobject.
4564 if (TypeLoc Next = TL.getNextTypeLoc())
4565 return Visit(Next, Sel);
4567 // If there's no inner type and we're in a permissive context,
4569 if (Sel == Sema::AbstractNone) return;
4571 // Check whether the type matches the abstract type.
4572 QualType T = TL.getType();
4573 if (T->isArrayType()) {
4574 Sel = Sema::AbstractArrayType;
4575 T = Info.S.Context.getBaseElementType(T);
4577 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType();
4578 if (CT != Info.AbstractType) return;
4580 // It matched; do some magic.
4581 if (Sel == Sema::AbstractArrayType) {
4582 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type)
4583 << T << TL.getSourceRange();
4585 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl)
4586 << Sel << T << TL.getSourceRange();
4588 Info.DiagnoseAbstractType();
4592 void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL,
4593 Sema::AbstractDiagSelID Sel) {
4594 CheckAbstractUsage(*this, D).Visit(TL, Sel);
4599 /// Check for invalid uses of an abstract type in a method declaration.
4600 static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
4601 CXXMethodDecl *MD) {
4602 // No need to do the check on definitions, which require that
4603 // the return/param types be complete.
4604 if (MD->doesThisDeclarationHaveABody())
4607 // For safety's sake, just ignore it if we don't have type source
4608 // information. This should never happen for non-implicit methods,
4610 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
4611 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone);
4614 /// Check for invalid uses of an abstract type within a class definition.
4615 static void CheckAbstractClassUsage(AbstractUsageInfo &Info,
4616 CXXRecordDecl *RD) {
4617 for (auto *D : RD->decls()) {
4618 if (D->isImplicit()) continue;
4620 // Methods and method templates.
4621 if (isa<CXXMethodDecl>(D)) {
4622 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D));
4623 } else if (isa<FunctionTemplateDecl>(D)) {
4624 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl();
4625 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD));
4627 // Fields and static variables.
4628 } else if (isa<FieldDecl>(D)) {
4629 FieldDecl *FD = cast<FieldDecl>(D);
4630 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo())
4631 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType);
4632 } else if (isa<VarDecl>(D)) {
4633 VarDecl *VD = cast<VarDecl>(D);
4634 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo())
4635 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType);
4637 // Nested classes and class templates.
4638 } else if (isa<CXXRecordDecl>(D)) {
4639 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D));
4640 } else if (isa<ClassTemplateDecl>(D)) {
4641 CheckAbstractClassUsage(Info,
4642 cast<ClassTemplateDecl>(D)->getTemplatedDecl());
4647 static void ReferenceDllExportedMethods(Sema &S, CXXRecordDecl *Class) {
4648 Attr *ClassAttr = getDLLAttr(Class);
4652 assert(ClassAttr->getKind() == attr::DLLExport);
4654 TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind();
4656 if (TSK == TSK_ExplicitInstantiationDeclaration)
4657 // Don't go any further if this is just an explicit instantiation
4661 for (Decl *Member : Class->decls()) {
4662 auto *MD = dyn_cast<CXXMethodDecl>(Member);
4666 if (Member->getAttr<DLLExportAttr>()) {
4667 if (MD->isUserProvided()) {
4668 // Instantiate non-default class member functions ...
4670 // .. except for certain kinds of template specializations.
4671 if (TSK == TSK_ImplicitInstantiation && !ClassAttr->isInherited())
4674 S.MarkFunctionReferenced(Class->getLocation(), MD);
4676 // The function will be passed to the consumer when its definition is
4678 } else if (!MD->isTrivial() || MD->isExplicitlyDefaulted() ||
4679 MD->isCopyAssignmentOperator() ||
4680 MD->isMoveAssignmentOperator()) {
4681 // Synthesize and instantiate non-trivial implicit methods, explicitly
4682 // defaulted methods, and the copy and move assignment operators. The
4683 // latter are exported even if they are trivial, because the address of
4684 // an operator can be taken and should compare equal accross libraries.
4685 DiagnosticErrorTrap Trap(S.Diags);
4686 S.MarkFunctionReferenced(Class->getLocation(), MD);
4687 if (Trap.hasErrorOccurred()) {
4688 S.Diag(ClassAttr->getLocation(), diag::note_due_to_dllexported_class)
4689 << Class->getName() << !S.getLangOpts().CPlusPlus11;
4693 // There is no later point when we will see the definition of this
4694 // function, so pass it to the consumer now.
4695 S.Consumer.HandleTopLevelDecl(DeclGroupRef(MD));
4701 /// \brief Check class-level dllimport/dllexport attribute.
4702 void Sema::checkClassLevelDLLAttribute(CXXRecordDecl *Class) {
4703 Attr *ClassAttr = getDLLAttr(Class);
4705 // MSVC inherits DLL attributes to partial class template specializations.
4706 if (Context.getTargetInfo().getCXXABI().isMicrosoft() && !ClassAttr) {
4707 if (auto *Spec = dyn_cast<ClassTemplatePartialSpecializationDecl>(Class)) {
4708 if (Attr *TemplateAttr =
4709 getDLLAttr(Spec->getSpecializedTemplate()->getTemplatedDecl())) {
4710 auto *A = cast<InheritableAttr>(TemplateAttr->clone(getASTContext()));
4711 A->setInherited(true);
4720 if (!Class->isExternallyVisible()) {
4721 Diag(Class->getLocation(), diag::err_attribute_dll_not_extern)
4722 << Class << ClassAttr;
4726 if (Context.getTargetInfo().getCXXABI().isMicrosoft() &&
4727 !ClassAttr->isInherited()) {
4728 // Diagnose dll attributes on members of class with dll attribute.
4729 for (Decl *Member : Class->decls()) {
4730 if (!isa<VarDecl>(Member) && !isa<CXXMethodDecl>(Member))
4732 InheritableAttr *MemberAttr = getDLLAttr(Member);
4733 if (!MemberAttr || MemberAttr->isInherited() || Member->isInvalidDecl())
4736 Diag(MemberAttr->getLocation(),
4737 diag::err_attribute_dll_member_of_dll_class)
4738 << MemberAttr << ClassAttr;
4739 Diag(ClassAttr->getLocation(), diag::note_previous_attribute);
4740 Member->setInvalidDecl();
4744 if (Class->getDescribedClassTemplate())
4745 // Don't inherit dll attribute until the template is instantiated.
4748 // The class is either imported or exported.
4749 const bool ClassExported = ClassAttr->getKind() == attr::DLLExport;
4751 TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind();
4753 // Ignore explicit dllexport on explicit class template instantiation declarations.
4754 if (ClassExported && !ClassAttr->isInherited() &&
4755 TSK == TSK_ExplicitInstantiationDeclaration) {
4756 Class->dropAttr<DLLExportAttr>();
4760 // Force declaration of implicit members so they can inherit the attribute.
4761 ForceDeclarationOfImplicitMembers(Class);
4763 // FIXME: MSVC's docs say all bases must be exportable, but this doesn't
4764 // seem to be true in practice?
4766 for (Decl *Member : Class->decls()) {
4767 VarDecl *VD = dyn_cast<VarDecl>(Member);
4768 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member);
4770 // Only methods and static fields inherit the attributes.
4775 // Don't process deleted methods.
4776 if (MD->isDeleted())
4779 if (MD->isInlined()) {
4780 // MinGW does not import or export inline methods.
4781 if (!Context.getTargetInfo().getCXXABI().isMicrosoft())
4784 // MSVC versions before 2015 don't export the move assignment operators
4785 // and move constructor, so don't attempt to import/export them if
4786 // we have a definition.
4787 auto *Ctor = dyn_cast<CXXConstructorDecl>(MD);
4788 if ((MD->isMoveAssignmentOperator() ||
4789 (Ctor && Ctor->isMoveConstructor())) &&
4790 !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015))
4793 // MSVC2015 doesn't export trivial defaulted x-tor but copy assign
4794 // operator is exported anyway.
4795 if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) &&
4796 (Ctor || isa<CXXDestructorDecl>(MD)) && MD->isTrivial())
4801 if (!cast<NamedDecl>(Member)->isExternallyVisible())
4804 if (!getDLLAttr(Member)) {
4806 cast<InheritableAttr>(ClassAttr->clone(getASTContext()));
4807 NewAttr->setInherited(true);
4808 Member->addAttr(NewAttr);
4813 DelayedDllExportClasses.push_back(Class);
4816 /// \brief Perform propagation of DLL attributes from a derived class to a
4817 /// templated base class for MS compatibility.
4818 void Sema::propagateDLLAttrToBaseClassTemplate(
4819 CXXRecordDecl *Class, Attr *ClassAttr,
4820 ClassTemplateSpecializationDecl *BaseTemplateSpec, SourceLocation BaseLoc) {
4822 BaseTemplateSpec->getSpecializedTemplate()->getTemplatedDecl())) {
4823 // If the base class template has a DLL attribute, don't try to change it.
4827 auto TSK = BaseTemplateSpec->getSpecializationKind();
4828 if (!getDLLAttr(BaseTemplateSpec) &&
4829 (TSK == TSK_Undeclared || TSK == TSK_ExplicitInstantiationDeclaration ||
4830 TSK == TSK_ImplicitInstantiation)) {
4831 // The template hasn't been instantiated yet (or it has, but only as an
4832 // explicit instantiation declaration or implicit instantiation, which means
4833 // we haven't codegenned any members yet), so propagate the attribute.
4834 auto *NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext()));
4835 NewAttr->setInherited(true);
4836 BaseTemplateSpec->addAttr(NewAttr);
4838 // If the template is already instantiated, checkDLLAttributeRedeclaration()
4839 // needs to be run again to work see the new attribute. Otherwise this will
4840 // get run whenever the template is instantiated.
4841 if (TSK != TSK_Undeclared)
4842 checkClassLevelDLLAttribute(BaseTemplateSpec);
4847 if (getDLLAttr(BaseTemplateSpec)) {
4848 // The template has already been specialized or instantiated with an
4849 // attribute, explicitly or through propagation. We should not try to change
4854 // The template was previously instantiated or explicitly specialized without
4855 // a dll attribute, It's too late for us to add an attribute, so warn that
4856 // this is unsupported.
4857 Diag(BaseLoc, diag::warn_attribute_dll_instantiated_base_class)
4858 << BaseTemplateSpec->isExplicitSpecialization();
4859 Diag(ClassAttr->getLocation(), diag::note_attribute);
4860 if (BaseTemplateSpec->isExplicitSpecialization()) {
4861 Diag(BaseTemplateSpec->getLocation(),
4862 diag::note_template_class_explicit_specialization_was_here)
4863 << BaseTemplateSpec;
4865 Diag(BaseTemplateSpec->getPointOfInstantiation(),
4866 diag::note_template_class_instantiation_was_here)
4867 << BaseTemplateSpec;
4871 static void DefineImplicitSpecialMember(Sema &S, CXXMethodDecl *MD,
4872 SourceLocation DefaultLoc) {
4873 switch (S.getSpecialMember(MD)) {
4874 case Sema::CXXDefaultConstructor:
4875 S.DefineImplicitDefaultConstructor(DefaultLoc,
4876 cast<CXXConstructorDecl>(MD));
4878 case Sema::CXXCopyConstructor:
4879 S.DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD));
4881 case Sema::CXXCopyAssignment:
4882 S.DefineImplicitCopyAssignment(DefaultLoc, MD);
4884 case Sema::CXXDestructor:
4885 S.DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(MD));
4887 case Sema::CXXMoveConstructor:
4888 S.DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD));
4890 case Sema::CXXMoveAssignment:
4891 S.DefineImplicitMoveAssignment(DefaultLoc, MD);
4893 case Sema::CXXInvalid:
4894 llvm_unreachable("Invalid special member.");
4898 /// \brief Perform semantic checks on a class definition that has been
4899 /// completing, introducing implicitly-declared members, checking for
4900 /// abstract types, etc.
4901 void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) {
4905 if (Record->isAbstract() && !Record->isInvalidDecl()) {
4906 AbstractUsageInfo Info(*this, Record);
4907 CheckAbstractClassUsage(Info, Record);
4910 // If this is not an aggregate type and has no user-declared constructor,
4911 // complain about any non-static data members of reference or const scalar
4912 // type, since they will never get initializers.
4913 if (!Record->isInvalidDecl() && !Record->isDependentType() &&
4914 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() &&
4915 !Record->isLambda()) {
4916 bool Complained = false;
4917 for (const auto *F : Record->fields()) {
4918 if (F->hasInClassInitializer() || F->isUnnamedBitfield())
4921 if (F->getType()->isReferenceType() ||
4922 (F->getType().isConstQualified() && F->getType()->isScalarType())) {
4924 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst)
4925 << Record->getTagKind() << Record;
4929 Diag(F->getLocation(), diag::note_refconst_member_not_initialized)
4930 << F->getType()->isReferenceType()
4931 << F->getDeclName();
4936 if (Record->getIdentifier()) {
4937 // C++ [class.mem]p13:
4938 // If T is the name of a class, then each of the following shall have a
4939 // name different from T:
4940 // - every member of every anonymous union that is a member of class T.
4942 // C++ [class.mem]p14:
4943 // In addition, if class T has a user-declared constructor (12.1), every
4944 // non-static data member of class T shall have a name different from T.
4945 DeclContext::lookup_result R = Record->lookup(Record->getDeclName());
4946 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E;
4949 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) ||
4950 isa<IndirectFieldDecl>(D)) {
4951 Diag(D->getLocation(), diag::err_member_name_of_class)
4952 << D->getDeclName();
4958 // Warn if the class has virtual methods but non-virtual public destructor.
4959 if (Record->isPolymorphic() && !Record->isDependentType()) {
4960 CXXDestructorDecl *dtor = Record->getDestructor();
4961 if ((!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) &&
4962 !Record->hasAttr<FinalAttr>())
4963 Diag(dtor ? dtor->getLocation() : Record->getLocation(),
4964 diag::warn_non_virtual_dtor) << Context.getRecordType(Record);
4967 if (Record->isAbstract()) {
4968 if (FinalAttr *FA = Record->getAttr<FinalAttr>()) {
4969 Diag(Record->getLocation(), diag::warn_abstract_final_class)
4970 << FA->isSpelledAsSealed();
4971 DiagnoseAbstractType(Record);
4975 bool HasMethodWithOverrideControl = false,
4976 HasOverridingMethodWithoutOverrideControl = false;
4977 if (!Record->isDependentType()) {
4978 for (auto *M : Record->methods()) {
4979 // See if a method overloads virtual methods in a base
4980 // class without overriding any.
4982 DiagnoseHiddenVirtualMethods(M);
4983 if (M->hasAttr<OverrideAttr>())
4984 HasMethodWithOverrideControl = true;
4985 else if (M->size_overridden_methods() > 0)
4986 HasOverridingMethodWithoutOverrideControl = true;
4987 // Check whether the explicitly-defaulted special members are valid.
4988 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted())
4989 CheckExplicitlyDefaultedSpecialMember(M);
4991 // For an explicitly defaulted or deleted special member, we defer
4992 // determining triviality until the class is complete. That time is now!
4993 CXXSpecialMember CSM = getSpecialMember(M);
4994 if (!M->isImplicit() && !M->isUserProvided()) {
4995 if (CSM != CXXInvalid) {
4996 M->setTrivial(SpecialMemberIsTrivial(M, CSM));
4998 // Inform the class that we've finished declaring this member.
4999 Record->finishedDefaultedOrDeletedMember(M);
5003 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted() &&
5004 M->hasAttr<DLLExportAttr>()) {
5005 if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) &&
5007 (CSM == CXXDefaultConstructor || CSM == CXXCopyConstructor ||
5008 CSM == CXXDestructor))
5009 M->dropAttr<DLLExportAttr>();
5011 if (M->hasAttr<DLLExportAttr>()) {
5012 DefineImplicitSpecialMember(*this, M, M->getLocation());
5013 ActOnFinishInlineFunctionDef(M);
5019 if (HasMethodWithOverrideControl &&
5020 HasOverridingMethodWithoutOverrideControl) {
5021 // At least one method has the 'override' control declared.
5022 // Diagnose all other overridden methods which do not have 'override' specified on them.
5023 for (auto *M : Record->methods())
5024 DiagnoseAbsenceOfOverrideControl(M);
5027 // ms_struct is a request to use the same ABI rules as MSVC. Check
5028 // whether this class uses any C++ features that are implemented
5029 // completely differently in MSVC, and if so, emit a diagnostic.
5030 // That diagnostic defaults to an error, but we allow projects to
5031 // map it down to a warning (or ignore it). It's a fairly common
5032 // practice among users of the ms_struct pragma to mass-annotate
5033 // headers, sweeping up a bunch of types that the project doesn't
5034 // really rely on MSVC-compatible layout for. We must therefore
5035 // support "ms_struct except for C++ stuff" as a secondary ABI.
5036 if (Record->isMsStruct(Context) &&
5037 (Record->isPolymorphic() || Record->getNumBases())) {
5038 Diag(Record->getLocation(), diag::warn_cxx_ms_struct);
5041 checkClassLevelDLLAttribute(Record);
5044 /// Look up the special member function that would be called by a special
5045 /// member function for a subobject of class type.
5047 /// \param Class The class type of the subobject.
5048 /// \param CSM The kind of special member function.
5049 /// \param FieldQuals If the subobject is a field, its cv-qualifiers.
5050 /// \param ConstRHS True if this is a copy operation with a const object
5051 /// on its RHS, that is, if the argument to the outer special member
5052 /// function is 'const' and this is not a field marked 'mutable'.
5053 static Sema::SpecialMemberOverloadResult *lookupCallFromSpecialMember(
5054 Sema &S, CXXRecordDecl *Class, Sema::CXXSpecialMember CSM,
5055 unsigned FieldQuals, bool ConstRHS) {
5056 unsigned LHSQuals = 0;
5057 if (CSM == Sema::CXXCopyAssignment || CSM == Sema::CXXMoveAssignment)
5058 LHSQuals = FieldQuals;
5060 unsigned RHSQuals = FieldQuals;
5061 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor)
5064 RHSQuals |= Qualifiers::Const;
5066 return S.LookupSpecialMember(Class, CSM,
5067 RHSQuals & Qualifiers::Const,
5068 RHSQuals & Qualifiers::Volatile,
5070 LHSQuals & Qualifiers::Const,
5071 LHSQuals & Qualifiers::Volatile);
5074 class Sema::InheritedConstructorInfo {
5076 SourceLocation UseLoc;
5078 /// A mapping from the base classes through which the constructor was
5079 /// inherited to the using shadow declaration in that base class (or a null
5080 /// pointer if the constructor was declared in that base class).
5081 llvm::DenseMap<CXXRecordDecl *, ConstructorUsingShadowDecl *>
5085 InheritedConstructorInfo(Sema &S, SourceLocation UseLoc,
5086 ConstructorUsingShadowDecl *Shadow)
5087 : S(S), UseLoc(UseLoc) {
5088 bool DiagnosedMultipleConstructedBases = false;
5089 CXXRecordDecl *ConstructedBase = nullptr;
5090 UsingDecl *ConstructedBaseUsing = nullptr;
5092 // Find the set of such base class subobjects and check that there's a
5093 // unique constructed subobject.
5094 for (auto *D : Shadow->redecls()) {
5095 auto *DShadow = cast<ConstructorUsingShadowDecl>(D);
5096 auto *DNominatedBase = DShadow->getNominatedBaseClass();
5097 auto *DConstructedBase = DShadow->getConstructedBaseClass();
5099 InheritedFromBases.insert(
5100 std::make_pair(DNominatedBase->getCanonicalDecl(),
5101 DShadow->getNominatedBaseClassShadowDecl()));
5102 if (DShadow->constructsVirtualBase())
5103 InheritedFromBases.insert(
5104 std::make_pair(DConstructedBase->getCanonicalDecl(),
5105 DShadow->getConstructedBaseClassShadowDecl()));
5107 assert(DNominatedBase == DConstructedBase);
5109 // [class.inhctor.init]p2:
5110 // If the constructor was inherited from multiple base class subobjects
5111 // of type B, the program is ill-formed.
5112 if (!ConstructedBase) {
5113 ConstructedBase = DConstructedBase;
5114 ConstructedBaseUsing = D->getUsingDecl();
5115 } else if (ConstructedBase != DConstructedBase &&
5116 !Shadow->isInvalidDecl()) {
5117 if (!DiagnosedMultipleConstructedBases) {
5118 S.Diag(UseLoc, diag::err_ambiguous_inherited_constructor)
5119 << Shadow->getTargetDecl();
5120 S.Diag(ConstructedBaseUsing->getLocation(),
5121 diag::note_ambiguous_inherited_constructor_using)
5123 DiagnosedMultipleConstructedBases = true;
5125 S.Diag(D->getUsingDecl()->getLocation(),
5126 diag::note_ambiguous_inherited_constructor_using)
5127 << DConstructedBase;
5131 if (DiagnosedMultipleConstructedBases)
5132 Shadow->setInvalidDecl();
5135 /// Find the constructor to use for inherited construction of a base class,
5136 /// and whether that base class constructor inherits the constructor from a
5137 /// virtual base class (in which case it won't actually invoke it).
5138 std::pair<CXXConstructorDecl *, bool>
5139 findConstructorForBase(CXXRecordDecl *Base, CXXConstructorDecl *Ctor) const {
5140 auto It = InheritedFromBases.find(Base->getCanonicalDecl());
5141 if (It == InheritedFromBases.end())
5142 return std::make_pair(nullptr, false);
5144 // This is an intermediary class.
5146 return std::make_pair(
5147 S.findInheritingConstructor(UseLoc, Ctor, It->second),
5148 It->second->constructsVirtualBase());
5150 // This is the base class from which the constructor was inherited.
5151 return std::make_pair(Ctor, false);
5155 /// Is the special member function which would be selected to perform the
5156 /// specified operation on the specified class type a constexpr constructor?
5158 specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl,
5159 Sema::CXXSpecialMember CSM, unsigned Quals,
5161 CXXConstructorDecl *InheritedCtor = nullptr,
5162 Sema::InheritedConstructorInfo *Inherited = nullptr) {
5163 // If we're inheriting a constructor, see if we need to call it for this base
5165 if (InheritedCtor) {
5166 assert(CSM == Sema::CXXDefaultConstructor);
5168 Inherited->findConstructorForBase(ClassDecl, InheritedCtor).first;
5170 return BaseCtor->isConstexpr();
5173 if (CSM == Sema::CXXDefaultConstructor)
5174 return ClassDecl->hasConstexprDefaultConstructor();
5176 Sema::SpecialMemberOverloadResult *SMOR =
5177 lookupCallFromSpecialMember(S, ClassDecl, CSM, Quals, ConstRHS);
5178 if (!SMOR || !SMOR->getMethod())
5179 // A constructor we wouldn't select can't be "involved in initializing"
5182 return SMOR->getMethod()->isConstexpr();
5185 /// Determine whether the specified special member function would be constexpr
5186 /// if it were implicitly defined.
5187 static bool defaultedSpecialMemberIsConstexpr(
5188 Sema &S, CXXRecordDecl *ClassDecl, Sema::CXXSpecialMember CSM,
5189 bool ConstArg, CXXConstructorDecl *InheritedCtor = nullptr,
5190 Sema::InheritedConstructorInfo *Inherited = nullptr) {
5191 if (!S.getLangOpts().CPlusPlus11)
5194 // C++11 [dcl.constexpr]p4:
5195 // In the definition of a constexpr constructor [...]
5198 case Sema::CXXDefaultConstructor:
5201 // Since default constructor lookup is essentially trivial (and cannot
5202 // involve, for instance, template instantiation), we compute whether a
5203 // defaulted default constructor is constexpr directly within CXXRecordDecl.
5205 // This is important for performance; we need to know whether the default
5206 // constructor is constexpr to determine whether the type is a literal type.
5207 return ClassDecl->defaultedDefaultConstructorIsConstexpr();
5209 case Sema::CXXCopyConstructor:
5210 case Sema::CXXMoveConstructor:
5211 // For copy or move constructors, we need to perform overload resolution.
5214 case Sema::CXXCopyAssignment:
5215 case Sema::CXXMoveAssignment:
5216 if (!S.getLangOpts().CPlusPlus14)
5218 // In C++1y, we need to perform overload resolution.
5222 case Sema::CXXDestructor:
5223 case Sema::CXXInvalid:
5227 // -- if the class is a non-empty union, or for each non-empty anonymous
5228 // union member of a non-union class, exactly one non-static data member
5229 // shall be initialized; [DR1359]
5231 // If we squint, this is guaranteed, since exactly one non-static data member
5232 // will be initialized (if the constructor isn't deleted), we just don't know
5234 if (Ctor && ClassDecl->isUnion())
5235 return CSM == Sema::CXXDefaultConstructor
5236 ? ClassDecl->hasInClassInitializer() ||
5237 !ClassDecl->hasVariantMembers()
5240 // -- the class shall not have any virtual base classes;
5241 if (Ctor && ClassDecl->getNumVBases())
5244 // C++1y [class.copy]p26:
5245 // -- [the class] is a literal type, and
5246 if (!Ctor && !ClassDecl->isLiteral())
5249 // -- every constructor involved in initializing [...] base class
5250 // sub-objects shall be a constexpr constructor;
5251 // -- the assignment operator selected to copy/move each direct base
5252 // class is a constexpr function, and
5253 for (const auto &B : ClassDecl->bases()) {
5254 const RecordType *BaseType = B.getType()->getAs<RecordType>();
5255 if (!BaseType) continue;
5257 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
5258 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, 0, ConstArg,
5259 InheritedCtor, Inherited))
5263 // -- every constructor involved in initializing non-static data members
5264 // [...] shall be a constexpr constructor;
5265 // -- every non-static data member and base class sub-object shall be
5267 // -- for each non-static data member of X that is of class type (or array
5268 // thereof), the assignment operator selected to copy/move that member is
5269 // a constexpr function
5270 for (const auto *F : ClassDecl->fields()) {
5271 if (F->isInvalidDecl())
5273 if (CSM == Sema::CXXDefaultConstructor && F->hasInClassInitializer())
5275 QualType BaseType = S.Context.getBaseElementType(F->getType());
5276 if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) {
5277 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
5278 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM,
5279 BaseType.getCVRQualifiers(),
5280 ConstArg && !F->isMutable()))
5282 } else if (CSM == Sema::CXXDefaultConstructor) {
5287 // All OK, it's constexpr!
5291 static Sema::ImplicitExceptionSpecification
5292 computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) {
5293 switch (S.getSpecialMember(MD)) {
5294 case Sema::CXXDefaultConstructor:
5295 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD);
5296 case Sema::CXXCopyConstructor:
5297 return S.ComputeDefaultedCopyCtorExceptionSpec(MD);
5298 case Sema::CXXCopyAssignment:
5299 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD);
5300 case Sema::CXXMoveConstructor:
5301 return S.ComputeDefaultedMoveCtorExceptionSpec(MD);
5302 case Sema::CXXMoveAssignment:
5303 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD);
5304 case Sema::CXXDestructor:
5305 return S.ComputeDefaultedDtorExceptionSpec(MD);
5306 case Sema::CXXInvalid:
5309 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() &&
5310 "only special members have implicit exception specs");
5311 return S.ComputeInheritingCtorExceptionSpec(Loc,
5312 cast<CXXConstructorDecl>(MD));
5315 static FunctionProtoType::ExtProtoInfo getImplicitMethodEPI(Sema &S,
5316 CXXMethodDecl *MD) {
5317 FunctionProtoType::ExtProtoInfo EPI;
5319 // Build an exception specification pointing back at this member.
5320 EPI.ExceptionSpec.Type = EST_Unevaluated;
5321 EPI.ExceptionSpec.SourceDecl = MD;
5323 // Set the calling convention to the default for C++ instance methods.
5324 EPI.ExtInfo = EPI.ExtInfo.withCallingConv(
5325 S.Context.getDefaultCallingConvention(/*IsVariadic=*/false,
5326 /*IsCXXMethod=*/true));
5330 void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) {
5331 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
5332 if (FPT->getExceptionSpecType() != EST_Unevaluated)
5335 // Evaluate the exception specification.
5336 auto ESI = computeImplicitExceptionSpec(*this, Loc, MD).getExceptionSpec();
5338 // Update the type of the special member to use it.
5339 UpdateExceptionSpec(MD, ESI);
5341 // A user-provided destructor can be defined outside the class. When that
5342 // happens, be sure to update the exception specification on both
5344 const FunctionProtoType *CanonicalFPT =
5345 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>();
5346 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated)
5347 UpdateExceptionSpec(MD->getCanonicalDecl(), ESI);
5350 void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) {
5351 CXXRecordDecl *RD = MD->getParent();
5352 CXXSpecialMember CSM = getSpecialMember(MD);
5354 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid &&
5355 "not an explicitly-defaulted special member");
5357 // Whether this was the first-declared instance of the constructor.
5358 // This affects whether we implicitly add an exception spec and constexpr.
5359 bool First = MD == MD->getCanonicalDecl();
5361 bool HadError = false;
5363 // C++11 [dcl.fct.def.default]p1:
5364 // A function that is explicitly defaulted shall
5365 // -- be a special member function (checked elsewhere),
5366 // -- have the same type (except for ref-qualifiers, and except that a
5367 // copy operation can take a non-const reference) as an implicit
5369 // -- not have default arguments.
5370 unsigned ExpectedParams = 1;
5371 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor)
5373 if (MD->getNumParams() != ExpectedParams) {
5374 // This also checks for default arguments: a copy or move constructor with a
5375 // default argument is classified as a default constructor, and assignment
5376 // operations and destructors can't have default arguments.
5377 Diag(MD->getLocation(), diag::err_defaulted_special_member_params)
5378 << CSM << MD->getSourceRange();
5380 } else if (MD->isVariadic()) {
5381 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic)
5382 << CSM << MD->getSourceRange();
5386 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>();
5388 bool CanHaveConstParam = false;
5389 if (CSM == CXXCopyConstructor)
5390 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam();
5391 else if (CSM == CXXCopyAssignment)
5392 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam();
5394 QualType ReturnType = Context.VoidTy;
5395 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) {
5396 // Check for return type matching.
5397 ReturnType = Type->getReturnType();
5398 QualType ExpectedReturnType =
5399 Context.getLValueReferenceType(Context.getTypeDeclType(RD));
5400 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) {
5401 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type)
5402 << (CSM == CXXMoveAssignment) << ExpectedReturnType;
5406 // A defaulted special member cannot have cv-qualifiers.
5407 if (Type->getTypeQuals()) {
5408 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals)
5409 << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus14;
5414 // Check for parameter type matching.
5415 QualType ArgType = ExpectedParams ? Type->getParamType(0) : QualType();
5416 bool HasConstParam = false;
5417 if (ExpectedParams && ArgType->isReferenceType()) {
5418 // Argument must be reference to possibly-const T.
5419 QualType ReferentType = ArgType->getPointeeType();
5420 HasConstParam = ReferentType.isConstQualified();
5422 if (ReferentType.isVolatileQualified()) {
5423 Diag(MD->getLocation(),
5424 diag::err_defaulted_special_member_volatile_param) << CSM;
5428 if (HasConstParam && !CanHaveConstParam) {
5429 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) {
5430 Diag(MD->getLocation(),
5431 diag::err_defaulted_special_member_copy_const_param)
5432 << (CSM == CXXCopyAssignment);
5433 // FIXME: Explain why this special member can't be const.
5435 Diag(MD->getLocation(),
5436 diag::err_defaulted_special_member_move_const_param)
5437 << (CSM == CXXMoveAssignment);
5441 } else if (ExpectedParams) {
5442 // A copy assignment operator can take its argument by value, but a
5443 // defaulted one cannot.
5444 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument");
5445 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref);
5449 // C++11 [dcl.fct.def.default]p2:
5450 // An explicitly-defaulted function may be declared constexpr only if it
5451 // would have been implicitly declared as constexpr,
5452 // Do not apply this rule to members of class templates, since core issue 1358
5453 // makes such functions always instantiate to constexpr functions. For
5454 // functions which cannot be constexpr (for non-constructors in C++11 and for
5455 // destructors in C++1y), this is checked elsewhere.
5456 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM,
5458 if ((getLangOpts().CPlusPlus14 ? !isa<CXXDestructorDecl>(MD)
5459 : isa<CXXConstructorDecl>(MD)) &&
5460 MD->isConstexpr() && !Constexpr &&
5461 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) {
5462 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM;
5463 // FIXME: Explain why the special member can't be constexpr.
5467 // and may have an explicit exception-specification only if it is compatible
5468 // with the exception-specification on the implicit declaration.
5469 if (Type->hasExceptionSpec()) {
5470 // Delay the check if this is the first declaration of the special member,
5471 // since we may not have parsed some necessary in-class initializers yet.
5473 // If the exception specification needs to be instantiated, do so now,
5474 // before we clobber it with an EST_Unevaluated specification below.
5475 if (Type->getExceptionSpecType() == EST_Uninstantiated) {
5476 InstantiateExceptionSpec(MD->getLocStart(), MD);
5477 Type = MD->getType()->getAs<FunctionProtoType>();
5479 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type));
5481 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type);
5484 // If a function is explicitly defaulted on its first declaration,
5486 // -- it is implicitly considered to be constexpr if the implicit
5487 // definition would be,
5488 MD->setConstexpr(Constexpr);
5490 // -- it is implicitly considered to have the same exception-specification
5491 // as if it had been implicitly declared,
5492 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo();
5493 EPI.ExceptionSpec.Type = EST_Unevaluated;
5494 EPI.ExceptionSpec.SourceDecl = MD;
5495 MD->setType(Context.getFunctionType(ReturnType,
5496 llvm::makeArrayRef(&ArgType,
5501 if (ShouldDeleteSpecialMember(MD, CSM)) {
5503 SetDeclDeleted(MD, MD->getLocation());
5505 // C++11 [dcl.fct.def.default]p4:
5506 // [For a] user-provided explicitly-defaulted function [...] if such a
5507 // function is implicitly defined as deleted, the program is ill-formed.
5508 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM;
5509 ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true);
5515 MD->setInvalidDecl();
5518 /// Check whether the exception specification provided for an
5519 /// explicitly-defaulted special member matches the exception specification
5520 /// that would have been generated for an implicit special member, per
5521 /// C++11 [dcl.fct.def.default]p2.
5522 void Sema::CheckExplicitlyDefaultedMemberExceptionSpec(
5523 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) {
5524 // If the exception specification was explicitly specified but hadn't been
5525 // parsed when the method was defaulted, grab it now.
5526 if (SpecifiedType->getExceptionSpecType() == EST_Unparsed)
5528 MD->getTypeSourceInfo()->getType()->castAs<FunctionProtoType>();
5530 // Compute the implicit exception specification.
5531 CallingConv CC = Context.getDefaultCallingConvention(/*IsVariadic=*/false,
5532 /*IsCXXMethod=*/true);
5533 FunctionProtoType::ExtProtoInfo EPI(CC);
5534 EPI.ExceptionSpec = computeImplicitExceptionSpec(*this, MD->getLocation(), MD)
5535 .getExceptionSpec();
5536 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>(
5537 Context.getFunctionType(Context.VoidTy, None, EPI));
5539 // Ensure that it matches.
5540 CheckEquivalentExceptionSpec(
5541 PDiag(diag::err_incorrect_defaulted_exception_spec)
5542 << getSpecialMember(MD), PDiag(),
5543 ImplicitType, SourceLocation(),
5544 SpecifiedType, MD->getLocation());
5547 void Sema::CheckDelayedMemberExceptionSpecs() {
5548 decltype(DelayedExceptionSpecChecks) Checks;
5549 decltype(DelayedDefaultedMemberExceptionSpecs) Specs;
5551 std::swap(Checks, DelayedExceptionSpecChecks);
5552 std::swap(Specs, DelayedDefaultedMemberExceptionSpecs);
5554 // Perform any deferred checking of exception specifications for virtual
5556 for (auto &Check : Checks)
5557 CheckOverridingFunctionExceptionSpec(Check.first, Check.second);
5559 // Check that any explicitly-defaulted methods have exception specifications
5560 // compatible with their implicit exception specifications.
5561 for (auto &Spec : Specs)
5562 CheckExplicitlyDefaultedMemberExceptionSpec(Spec.first, Spec.second);
5566 struct SpecialMemberDeletionInfo {
5569 Sema::CXXSpecialMember CSM;
5570 Sema::InheritedConstructorInfo *ICI;
5573 // Properties of the special member, computed for convenience.
5574 bool IsConstructor, IsAssignment, IsMove, ConstArg;
5577 bool AllFieldsAreConst;
5579 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD,
5580 Sema::CXXSpecialMember CSM,
5581 Sema::InheritedConstructorInfo *ICI, bool Diagnose)
5582 : S(S), MD(MD), CSM(CSM), ICI(ICI), Diagnose(Diagnose),
5583 IsConstructor(false), IsAssignment(false), IsMove(false),
5584 ConstArg(false), Loc(MD->getLocation()), AllFieldsAreConst(true) {
5586 case Sema::CXXDefaultConstructor:
5587 case Sema::CXXCopyConstructor:
5588 IsConstructor = true;
5590 case Sema::CXXMoveConstructor:
5591 IsConstructor = true;
5594 case Sema::CXXCopyAssignment:
5595 IsAssignment = true;
5597 case Sema::CXXMoveAssignment:
5598 IsAssignment = true;
5601 case Sema::CXXDestructor:
5603 case Sema::CXXInvalid:
5604 llvm_unreachable("invalid special member kind");
5607 if (MD->getNumParams()) {
5608 if (const ReferenceType *RT =
5609 MD->getParamDecl(0)->getType()->getAs<ReferenceType>())
5610 ConstArg = RT->getPointeeType().isConstQualified();
5614 bool inUnion() const { return MD->getParent()->isUnion(); }
5616 Sema::CXXSpecialMember getEffectiveCSM() {
5617 return ICI ? Sema::CXXInvalid : CSM;
5620 /// Look up the corresponding special member in the given class.
5621 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class,
5622 unsigned Quals, bool IsMutable) {
5623 return lookupCallFromSpecialMember(S, Class, CSM, Quals,
5624 ConstArg && !IsMutable);
5627 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject;
5629 bool shouldDeleteForBase(CXXBaseSpecifier *Base);
5630 bool shouldDeleteForField(FieldDecl *FD);
5631 bool shouldDeleteForAllConstMembers();
5633 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj,
5635 bool shouldDeleteForSubobjectCall(Subobject Subobj,
5636 Sema::SpecialMemberOverloadResult *SMOR,
5637 bool IsDtorCallInCtor);
5639 bool isAccessible(Subobject Subobj, CXXMethodDecl *D);
5643 /// Is the given special member inaccessible when used on the given
5645 bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj,
5646 CXXMethodDecl *target) {
5647 /// If we're operating on a base class, the object type is the
5648 /// type of this special member.
5650 AccessSpecifier access = target->getAccess();
5651 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) {
5652 objectTy = S.Context.getTypeDeclType(MD->getParent());
5653 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access);
5655 // If we're operating on a field, the object type is the type of the field.
5657 objectTy = S.Context.getTypeDeclType(target->getParent());
5660 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy);
5663 /// Check whether we should delete a special member due to the implicit
5664 /// definition containing a call to a special member of a subobject.
5665 bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall(
5666 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR,
5667 bool IsDtorCallInCtor) {
5668 CXXMethodDecl *Decl = SMOR->getMethod();
5669 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
5673 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)
5674 DiagKind = !Decl ? 0 : 1;
5675 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
5677 else if (!isAccessible(Subobj, Decl))
5679 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() &&
5680 !Decl->isTrivial()) {
5681 // A member of a union must have a trivial corresponding special member.
5682 // As a weird special case, a destructor call from a union's constructor
5683 // must be accessible and non-deleted, but need not be trivial. Such a
5684 // destructor is never actually called, but is semantically checked as
5694 S.Diag(Field->getLocation(),
5695 diag::note_deleted_special_member_class_subobject)
5696 << getEffectiveCSM() << MD->getParent() << /*IsField*/true
5697 << Field << DiagKind << IsDtorCallInCtor;
5699 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>();
5700 S.Diag(Base->getLocStart(),
5701 diag::note_deleted_special_member_class_subobject)
5702 << getEffectiveCSM() << MD->getParent() << /*IsField*/false
5703 << Base->getType() << DiagKind << IsDtorCallInCtor;
5707 S.NoteDeletedFunction(Decl);
5708 // FIXME: Explain inaccessibility if DiagKind == 3.
5714 /// Check whether we should delete a special member function due to having a
5715 /// direct or virtual base class or non-static data member of class type M.
5716 bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject(
5717 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) {
5718 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>();
5719 bool IsMutable = Field && Field->isMutable();
5721 // C++11 [class.ctor]p5:
5722 // -- any direct or virtual base class, or non-static data member with no
5723 // brace-or-equal-initializer, has class type M (or array thereof) and
5724 // either M has no default constructor or overload resolution as applied
5725 // to M's default constructor results in an ambiguity or in a function
5726 // that is deleted or inaccessible
5727 // C++11 [class.copy]p11, C++11 [class.copy]p23:
5728 // -- a direct or virtual base class B that cannot be copied/moved because
5729 // overload resolution, as applied to B's corresponding special member,
5730 // results in an ambiguity or a function that is deleted or inaccessible
5731 // from the defaulted special member
5732 // C++11 [class.dtor]p5:
5733 // -- any direct or virtual base class [...] has a type with a destructor
5734 // that is deleted or inaccessible
5735 if (!(CSM == Sema::CXXDefaultConstructor &&
5736 Field && Field->hasInClassInitializer()) &&
5737 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable),
5741 // C++11 [class.ctor]p5, C++11 [class.copy]p11:
5742 // -- any direct or virtual base class or non-static data member has a
5743 // type with a destructor that is deleted or inaccessible
5744 if (IsConstructor) {
5745 Sema::SpecialMemberOverloadResult *SMOR =
5746 S.LookupSpecialMember(Class, Sema::CXXDestructor,
5747 false, false, false, false, false);
5748 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true))
5755 /// Check whether we should delete a special member function due to the class
5756 /// having a particular direct or virtual base class.
5757 bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) {
5758 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl();
5759 // If program is correct, BaseClass cannot be null, but if it is, the error
5760 // must be reported elsewhere.
5763 // If we have an inheriting constructor, check whether we're calling an
5764 // inherited constructor instead of a default constructor.
5766 assert(CSM == Sema::CXXDefaultConstructor);
5768 ICI->findConstructorForBase(BaseClass, cast<CXXConstructorDecl>(MD)
5769 ->getInheritedConstructor()
5773 if (BaseCtor->isDeleted() && Diagnose) {
5774 S.Diag(Base->getLocStart(),
5775 diag::note_deleted_special_member_class_subobject)
5776 << getEffectiveCSM() << MD->getParent() << /*IsField*/false
5777 << Base->getType() << /*Deleted*/1 << /*IsDtorCallInCtor*/false;
5778 S.NoteDeletedFunction(BaseCtor);
5780 return BaseCtor->isDeleted();
5783 return shouldDeleteForClassSubobject(BaseClass, Base, 0);
5786 /// Check whether we should delete a special member function due to the class
5787 /// having a particular non-static data member.
5788 bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) {
5789 QualType FieldType = S.Context.getBaseElementType(FD->getType());
5790 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl();
5792 if (CSM == Sema::CXXDefaultConstructor) {
5793 // For a default constructor, all references must be initialized in-class
5794 // and, if a union, it must have a non-const member.
5795 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) {
5797 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
5798 << !!ICI << MD->getParent() << FD << FieldType << /*Reference*/0;
5801 // C++11 [class.ctor]p5: any non-variant non-static data member of
5802 // const-qualified type (or array thereof) with no
5803 // brace-or-equal-initializer does not have a user-provided default
5805 if (!inUnion() && FieldType.isConstQualified() &&
5806 !FD->hasInClassInitializer() &&
5807 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) {
5809 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field)
5810 << !!ICI << MD->getParent() << FD << FD->getType() << /*Const*/1;
5814 if (inUnion() && !FieldType.isConstQualified())
5815 AllFieldsAreConst = false;
5816 } else if (CSM == Sema::CXXCopyConstructor) {
5817 // For a copy constructor, data members must not be of rvalue reference
5819 if (FieldType->isRValueReferenceType()) {
5821 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference)
5822 << MD->getParent() << FD << FieldType;
5825 } else if (IsAssignment) {
5826 // For an assignment operator, data members must not be of reference type.
5827 if (FieldType->isReferenceType()) {
5829 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
5830 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0;
5833 if (!FieldRecord && FieldType.isConstQualified()) {
5834 // C++11 [class.copy]p23:
5835 // -- a non-static data member of const non-class type (or array thereof)
5837 S.Diag(FD->getLocation(), diag::note_deleted_assign_field)
5838 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1;
5844 // Some additional restrictions exist on the variant members.
5845 if (!inUnion() && FieldRecord->isUnion() &&
5846 FieldRecord->isAnonymousStructOrUnion()) {
5847 bool AllVariantFieldsAreConst = true;
5849 // FIXME: Handle anonymous unions declared within anonymous unions.
5850 for (auto *UI : FieldRecord->fields()) {
5851 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType());
5853 if (!UnionFieldType.isConstQualified())
5854 AllVariantFieldsAreConst = false;
5856 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl();
5857 if (UnionFieldRecord &&
5858 shouldDeleteForClassSubobject(UnionFieldRecord, UI,
5859 UnionFieldType.getCVRQualifiers()))
5863 // At least one member in each anonymous union must be non-const
5864 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst &&
5865 !FieldRecord->field_empty()) {
5867 S.Diag(FieldRecord->getLocation(),
5868 diag::note_deleted_default_ctor_all_const)
5869 << !!ICI << MD->getParent() << /*anonymous union*/1;
5873 // Don't check the implicit member of the anonymous union type.
5874 // This is technically non-conformant, but sanity demands it.
5878 if (shouldDeleteForClassSubobject(FieldRecord, FD,
5879 FieldType.getCVRQualifiers()))
5886 /// C++11 [class.ctor] p5:
5887 /// A defaulted default constructor for a class X is defined as deleted if
5888 /// X is a union and all of its variant members are of const-qualified type.
5889 bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() {
5890 // This is a silly definition, because it gives an empty union a deleted
5891 // default constructor. Don't do that.
5892 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst &&
5893 !MD->getParent()->field_empty()) {
5895 S.Diag(MD->getParent()->getLocation(),
5896 diag::note_deleted_default_ctor_all_const)
5897 << !!ICI << MD->getParent() << /*not anonymous union*/0;
5903 /// Determine whether a defaulted special member function should be defined as
5904 /// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11,
5905 /// C++11 [class.copy]p23, and C++11 [class.dtor]p5.
5906 bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM,
5907 InheritedConstructorInfo *ICI,
5909 if (MD->isInvalidDecl())
5911 CXXRecordDecl *RD = MD->getParent();
5912 assert(!RD->isDependentType() && "do deletion after instantiation");
5913 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl())
5916 // C++11 [expr.lambda.prim]p19:
5917 // The closure type associated with a lambda-expression has a
5918 // deleted (8.4.3) default constructor and a deleted copy
5919 // assignment operator.
5920 if (RD->isLambda() &&
5921 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) {
5923 Diag(RD->getLocation(), diag::note_lambda_decl);
5927 // For an anonymous struct or union, the copy and assignment special members
5928 // will never be used, so skip the check. For an anonymous union declared at
5929 // namespace scope, the constructor and destructor are used.
5930 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor &&
5931 RD->isAnonymousStructOrUnion())
5934 // C++11 [class.copy]p7, p18:
5935 // If the class definition declares a move constructor or move assignment
5936 // operator, an implicitly declared copy constructor or copy assignment
5937 // operator is defined as deleted.
5938 if (MD->isImplicit() &&
5939 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) {
5940 CXXMethodDecl *UserDeclaredMove = nullptr;
5942 // In Microsoft mode, a user-declared move only causes the deletion of the
5943 // corresponding copy operation, not both copy operations.
5944 if (RD->hasUserDeclaredMoveConstructor() &&
5945 (!getLangOpts().MSVCCompat || CSM == CXXCopyConstructor)) {
5946 if (!Diagnose) return true;
5948 // Find any user-declared move constructor.
5949 for (auto *I : RD->ctors()) {
5950 if (I->isMoveConstructor()) {
5951 UserDeclaredMove = I;
5955 assert(UserDeclaredMove);
5956 } else if (RD->hasUserDeclaredMoveAssignment() &&
5957 (!getLangOpts().MSVCCompat || CSM == CXXCopyAssignment)) {
5958 if (!Diagnose) return true;
5960 // Find any user-declared move assignment operator.
5961 for (auto *I : RD->methods()) {
5962 if (I->isMoveAssignmentOperator()) {
5963 UserDeclaredMove = I;
5967 assert(UserDeclaredMove);
5970 if (UserDeclaredMove) {
5971 Diag(UserDeclaredMove->getLocation(),
5972 diag::note_deleted_copy_user_declared_move)
5973 << (CSM == CXXCopyAssignment) << RD
5974 << UserDeclaredMove->isMoveAssignmentOperator();
5979 // Do access control from the special member function
5980 ContextRAII MethodContext(*this, MD);
5982 // C++11 [class.dtor]p5:
5983 // -- for a virtual destructor, lookup of the non-array deallocation function
5984 // results in an ambiguity or in a function that is deleted or inaccessible
5985 if (CSM == CXXDestructor && MD->isVirtual()) {
5986 FunctionDecl *OperatorDelete = nullptr;
5987 DeclarationName Name =
5988 Context.DeclarationNames.getCXXOperatorName(OO_Delete);
5989 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name,
5990 OperatorDelete, false)) {
5992 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete);
5997 SpecialMemberDeletionInfo SMI(*this, MD, CSM, ICI, Diagnose);
5999 for (auto &BI : RD->bases())
6000 if (!BI.isVirtual() &&
6001 SMI.shouldDeleteForBase(&BI))
6004 // Per DR1611, do not consider virtual bases of constructors of abstract
6005 // classes, since we are not going to construct them.
6006 if (!RD->isAbstract() || !SMI.IsConstructor) {
6007 for (auto &BI : RD->vbases())
6008 if (SMI.shouldDeleteForBase(&BI))
6012 for (auto *FI : RD->fields())
6013 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() &&
6014 SMI.shouldDeleteForField(FI))
6017 if (SMI.shouldDeleteForAllConstMembers())
6020 if (getLangOpts().CUDA) {
6021 // We should delete the special member in CUDA mode if target inference
6023 return inferCUDATargetForImplicitSpecialMember(RD, CSM, MD, SMI.ConstArg,
6030 /// Perform lookup for a special member of the specified kind, and determine
6031 /// whether it is trivial. If the triviality can be determined without the
6032 /// lookup, skip it. This is intended for use when determining whether a
6033 /// special member of a containing object is trivial, and thus does not ever
6034 /// perform overload resolution for default constructors.
6036 /// If \p Selected is not \c NULL, \c *Selected will be filled in with the
6037 /// member that was most likely to be intended to be trivial, if any.
6038 static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD,
6039 Sema::CXXSpecialMember CSM, unsigned Quals,
6040 bool ConstRHS, CXXMethodDecl **Selected) {
6042 *Selected = nullptr;
6045 case Sema::CXXInvalid:
6046 llvm_unreachable("not a special member");
6048 case Sema::CXXDefaultConstructor:
6049 // C++11 [class.ctor]p5:
6050 // A default constructor is trivial if:
6051 // - all the [direct subobjects] have trivial default constructors
6053 // Note, no overload resolution is performed in this case.
6054 if (RD->hasTrivialDefaultConstructor())
6058 // If there's a default constructor which could have been trivial, dig it
6059 // out. Otherwise, if there's any user-provided default constructor, point
6060 // to that as an example of why there's not a trivial one.
6061 CXXConstructorDecl *DefCtor = nullptr;
6062 if (RD->needsImplicitDefaultConstructor())
6063 S.DeclareImplicitDefaultConstructor(RD);
6064 for (auto *CI : RD->ctors()) {
6065 if (!CI->isDefaultConstructor())
6068 if (!DefCtor->isUserProvided())
6072 *Selected = DefCtor;
6077 case Sema::CXXDestructor:
6078 // C++11 [class.dtor]p5:
6079 // A destructor is trivial if:
6080 // - all the direct [subobjects] have trivial destructors
6081 if (RD->hasTrivialDestructor())
6085 if (RD->needsImplicitDestructor())
6086 S.DeclareImplicitDestructor(RD);
6087 *Selected = RD->getDestructor();
6092 case Sema::CXXCopyConstructor:
6093 // C++11 [class.copy]p12:
6094 // A copy constructor is trivial if:
6095 // - the constructor selected to copy each direct [subobject] is trivial
6096 if (RD->hasTrivialCopyConstructor()) {
6097 if (Quals == Qualifiers::Const)
6098 // We must either select the trivial copy constructor or reach an
6099 // ambiguity; no need to actually perform overload resolution.
6101 } else if (!Selected) {
6104 // In C++98, we are not supposed to perform overload resolution here, but we
6105 // treat that as a language defect, as suggested on cxx-abi-dev, to treat
6106 // cases like B as having a non-trivial copy constructor:
6107 // struct A { template<typename T> A(T&); };
6108 // struct B { mutable A a; };
6109 goto NeedOverloadResolution;
6111 case Sema::CXXCopyAssignment:
6112 // C++11 [class.copy]p25:
6113 // A copy assignment operator is trivial if:
6114 // - the assignment operator selected to copy each direct [subobject] is
6116 if (RD->hasTrivialCopyAssignment()) {
6117 if (Quals == Qualifiers::Const)
6119 } else if (!Selected) {
6122 // In C++98, we are not supposed to perform overload resolution here, but we
6123 // treat that as a language defect.
6124 goto NeedOverloadResolution;
6126 case Sema::CXXMoveConstructor:
6127 case Sema::CXXMoveAssignment:
6128 NeedOverloadResolution:
6129 Sema::SpecialMemberOverloadResult *SMOR =
6130 lookupCallFromSpecialMember(S, RD, CSM, Quals, ConstRHS);
6132 // The standard doesn't describe how to behave if the lookup is ambiguous.
6133 // We treat it as not making the member non-trivial, just like the standard
6134 // mandates for the default constructor. This should rarely matter, because
6135 // the member will also be deleted.
6136 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous)
6139 if (!SMOR->getMethod()) {
6140 assert(SMOR->getKind() ==
6141 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted);
6145 // We deliberately don't check if we found a deleted special member. We're
6148 *Selected = SMOR->getMethod();
6149 return SMOR->getMethod()->isTrivial();
6152 llvm_unreachable("unknown special method kind");
6155 static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) {
6156 for (auto *CI : RD->ctors())
6157 if (!CI->isImplicit())
6160 // Look for constructor templates.
6161 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter;
6162 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) {
6163 if (CXXConstructorDecl *CD =
6164 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()))
6171 /// The kind of subobject we are checking for triviality. The values of this
6172 /// enumeration are used in diagnostics.
6173 enum TrivialSubobjectKind {
6174 /// The subobject is a base class.
6176 /// The subobject is a non-static data member.
6178 /// The object is actually the complete object.
6182 /// Check whether the special member selected for a given type would be trivial.
6183 static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc,
6184 QualType SubType, bool ConstRHS,
6185 Sema::CXXSpecialMember CSM,
6186 TrivialSubobjectKind Kind,
6188 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl();
6192 CXXMethodDecl *Selected;
6193 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(),
6194 ConstRHS, Diagnose ? &Selected : nullptr))
6201 if (!Selected && CSM == Sema::CXXDefaultConstructor) {
6202 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor)
6203 << Kind << SubType.getUnqualifiedType();
6204 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD))
6205 S.Diag(CD->getLocation(), diag::note_user_declared_ctor);
6206 } else if (!Selected)
6207 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy)
6208 << Kind << SubType.getUnqualifiedType() << CSM << SubType;
6209 else if (Selected->isUserProvided()) {
6210 if (Kind == TSK_CompleteObject)
6211 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided)
6212 << Kind << SubType.getUnqualifiedType() << CSM;
6214 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided)
6215 << Kind << SubType.getUnqualifiedType() << CSM;
6216 S.Diag(Selected->getLocation(), diag::note_declared_at);
6219 if (Kind != TSK_CompleteObject)
6220 S.Diag(SubobjLoc, diag::note_nontrivial_subobject)
6221 << Kind << SubType.getUnqualifiedType() << CSM;
6223 // Explain why the defaulted or deleted special member isn't trivial.
6224 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose);
6231 /// Check whether the members of a class type allow a special member to be
6233 static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD,
6234 Sema::CXXSpecialMember CSM,
6235 bool ConstArg, bool Diagnose) {
6236 for (const auto *FI : RD->fields()) {
6237 if (FI->isInvalidDecl() || FI->isUnnamedBitfield())
6240 QualType FieldType = S.Context.getBaseElementType(FI->getType());
6242 // Pretend anonymous struct or union members are members of this class.
6243 if (FI->isAnonymousStructOrUnion()) {
6244 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(),
6245 CSM, ConstArg, Diagnose))
6250 // C++11 [class.ctor]p5:
6251 // A default constructor is trivial if [...]
6252 // -- no non-static data member of its class has a
6253 // brace-or-equal-initializer
6254 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) {
6256 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << FI;
6260 // Objective C ARC 4.3.5:
6261 // [...] nontrivally ownership-qualified types are [...] not trivially
6262 // default constructible, copy constructible, move constructible, copy
6263 // assignable, move assignable, or destructible [...]
6264 if (S.getLangOpts().ObjCAutoRefCount &&
6265 FieldType.hasNonTrivialObjCLifetime()) {
6267 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership)
6268 << RD << FieldType.getObjCLifetime();
6272 bool ConstRHS = ConstArg && !FI->isMutable();
6273 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, ConstRHS,
6274 CSM, TSK_Field, Diagnose))
6281 /// Diagnose why the specified class does not have a trivial special member of
6283 void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) {
6284 QualType Ty = Context.getRecordType(RD);
6286 bool ConstArg = (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment);
6287 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, ConstArg, CSM,
6288 TSK_CompleteObject, /*Diagnose*/true);
6291 /// Determine whether a defaulted or deleted special member function is trivial,
6292 /// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12,
6293 /// C++11 [class.copy]p25, and C++11 [class.dtor]p5.
6294 bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM,
6296 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough");
6298 CXXRecordDecl *RD = MD->getParent();
6300 bool ConstArg = false;
6302 // C++11 [class.copy]p12, p25: [DR1593]
6303 // A [special member] is trivial if [...] its parameter-type-list is
6304 // equivalent to the parameter-type-list of an implicit declaration [...]
6306 case CXXDefaultConstructor:
6308 // Trivial default constructors and destructors cannot have parameters.
6311 case CXXCopyConstructor:
6312 case CXXCopyAssignment: {
6313 // Trivial copy operations always have const, non-volatile parameter types.
6315 const ParmVarDecl *Param0 = MD->getParamDecl(0);
6316 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>();
6317 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) {
6319 Diag(Param0->getLocation(), diag::note_nontrivial_param_type)
6320 << Param0->getSourceRange() << Param0->getType()
6321 << Context.getLValueReferenceType(
6322 Context.getRecordType(RD).withConst());
6328 case CXXMoveConstructor:
6329 case CXXMoveAssignment: {
6330 // Trivial move operations always have non-cv-qualified parameters.
6331 const ParmVarDecl *Param0 = MD->getParamDecl(0);
6332 const RValueReferenceType *RT =
6333 Param0->getType()->getAs<RValueReferenceType>();
6334 if (!RT || RT->getPointeeType().getCVRQualifiers()) {
6336 Diag(Param0->getLocation(), diag::note_nontrivial_param_type)
6337 << Param0->getSourceRange() << Param0->getType()
6338 << Context.getRValueReferenceType(Context.getRecordType(RD));
6345 llvm_unreachable("not a special member");
6348 if (MD->getMinRequiredArguments() < MD->getNumParams()) {
6350 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(),
6351 diag::note_nontrivial_default_arg)
6352 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange();
6355 if (MD->isVariadic()) {
6357 Diag(MD->getLocation(), diag::note_nontrivial_variadic);
6361 // C++11 [class.ctor]p5, C++11 [class.dtor]p5:
6362 // A copy/move [constructor or assignment operator] is trivial if
6363 // -- the [member] selected to copy/move each direct base class subobject
6366 // C++11 [class.copy]p12, C++11 [class.copy]p25:
6367 // A [default constructor or destructor] is trivial if
6368 // -- all the direct base classes have trivial [default constructors or
6370 for (const auto &BI : RD->bases())
6371 if (!checkTrivialSubobjectCall(*this, BI.getLocStart(), BI.getType(),
6372 ConstArg, CSM, TSK_BaseClass, Diagnose))
6375 // C++11 [class.ctor]p5, C++11 [class.dtor]p5:
6376 // A copy/move [constructor or assignment operator] for a class X is
6378 // -- for each non-static data member of X that is of class type (or array
6379 // thereof), the constructor selected to copy/move that member is
6382 // C++11 [class.copy]p12, C++11 [class.copy]p25:
6383 // A [default constructor or destructor] is trivial if
6384 // -- for all of the non-static data members of its class that are of class
6385 // type (or array thereof), each such class has a trivial [default
6386 // constructor or destructor]
6387 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose))
6390 // C++11 [class.dtor]p5:
6391 // A destructor is trivial if [...]
6392 // -- the destructor is not virtual
6393 if (CSM == CXXDestructor && MD->isVirtual()) {
6395 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD;
6399 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25:
6400 // A [special member] for class X is trivial if [...]
6401 // -- class X has no virtual functions and no virtual base classes
6402 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) {
6406 if (RD->getNumVBases()) {
6407 // Check for virtual bases. We already know that the corresponding
6408 // member in all bases is trivial, so vbases must all be direct.
6409 CXXBaseSpecifier &BS = *RD->vbases_begin();
6410 assert(BS.isVirtual());
6411 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1;
6415 // Must have a virtual method.
6416 for (const auto *MI : RD->methods()) {
6417 if (MI->isVirtual()) {
6418 SourceLocation MLoc = MI->getLocStart();
6419 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0;
6424 llvm_unreachable("dynamic class with no vbases and no virtual functions");
6427 // Looks like it's trivial!
6432 struct FindHiddenVirtualMethod {
6434 CXXMethodDecl *Method;
6435 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods;
6436 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
6439 /// Check whether any most overriden method from MD in Methods
6440 static bool CheckMostOverridenMethods(
6441 const CXXMethodDecl *MD,
6442 const llvm::SmallPtrSetImpl<const CXXMethodDecl *> &Methods) {
6443 if (MD->size_overridden_methods() == 0)
6444 return Methods.count(MD->getCanonicalDecl());
6445 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
6446 E = MD->end_overridden_methods();
6448 if (CheckMostOverridenMethods(*I, Methods))
6454 /// Member lookup function that determines whether a given C++
6455 /// method overloads virtual methods in a base class without overriding any,
6456 /// to be used with CXXRecordDecl::lookupInBases().
6457 bool operator()(const CXXBaseSpecifier *Specifier, CXXBasePath &Path) {
6458 RecordDecl *BaseRecord =
6459 Specifier->getType()->getAs<RecordType>()->getDecl();
6461 DeclarationName Name = Method->getDeclName();
6462 assert(Name.getNameKind() == DeclarationName::Identifier);
6464 bool foundSameNameMethod = false;
6465 SmallVector<CXXMethodDecl *, 8> overloadedMethods;
6466 for (Path.Decls = BaseRecord->lookup(Name); !Path.Decls.empty();
6467 Path.Decls = Path.Decls.slice(1)) {
6468 NamedDecl *D = Path.Decls.front();
6469 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
6470 MD = MD->getCanonicalDecl();
6471 foundSameNameMethod = true;
6472 // Interested only in hidden virtual methods.
6473 if (!MD->isVirtual())
6475 // If the method we are checking overrides a method from its base
6476 // don't warn about the other overloaded methods. Clang deviates from
6477 // GCC by only diagnosing overloads of inherited virtual functions that
6478 // do not override any other virtual functions in the base. GCC's
6479 // -Woverloaded-virtual diagnoses any derived function hiding a virtual
6480 // function from a base class. These cases may be better served by a
6481 // warning (not specific to virtual functions) on call sites when the
6482 // call would select a different function from the base class, were it
6484 // See FIXME in test/SemaCXX/warn-overload-virtual.cpp for an example.
6485 if (!S->IsOverload(Method, MD, false))
6487 // Collect the overload only if its hidden.
6488 if (!CheckMostOverridenMethods(MD, OverridenAndUsingBaseMethods))
6489 overloadedMethods.push_back(MD);
6493 if (foundSameNameMethod)
6494 OverloadedMethods.append(overloadedMethods.begin(),
6495 overloadedMethods.end());
6496 return foundSameNameMethod;
6499 } // end anonymous namespace
6501 /// \brief Add the most overriden methods from MD to Methods
6502 static void AddMostOverridenMethods(const CXXMethodDecl *MD,
6503 llvm::SmallPtrSetImpl<const CXXMethodDecl *>& Methods) {
6504 if (MD->size_overridden_methods() == 0)
6505 Methods.insert(MD->getCanonicalDecl());
6506 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
6507 E = MD->end_overridden_methods();
6509 AddMostOverridenMethods(*I, Methods);
6512 /// \brief Check if a method overloads virtual methods in a base class without
6514 void Sema::FindHiddenVirtualMethods(CXXMethodDecl *MD,
6515 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) {
6516 if (!MD->getDeclName().isIdentifier())
6519 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases.
6520 /*bool RecordPaths=*/false,
6521 /*bool DetectVirtual=*/false);
6522 FindHiddenVirtualMethod FHVM;
6526 // Keep the base methods that were overriden or introduced in the subclass
6527 // by 'using' in a set. A base method not in this set is hidden.
6528 CXXRecordDecl *DC = MD->getParent();
6529 DeclContext::lookup_result R = DC->lookup(MD->getDeclName());
6530 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) {
6532 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I))
6533 ND = shad->getTargetDecl();
6534 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
6535 AddMostOverridenMethods(MD, FHVM.OverridenAndUsingBaseMethods);
6538 if (DC->lookupInBases(FHVM, Paths))
6539 OverloadedMethods = FHVM.OverloadedMethods;
6542 void Sema::NoteHiddenVirtualMethods(CXXMethodDecl *MD,
6543 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) {
6544 for (unsigned i = 0, e = OverloadedMethods.size(); i != e; ++i) {
6545 CXXMethodDecl *overloadedMD = OverloadedMethods[i];
6546 PartialDiagnostic PD = PDiag(
6547 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD;
6548 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType());
6549 Diag(overloadedMD->getLocation(), PD);
6553 /// \brief Diagnose methods which overload virtual methods in a base class
6554 /// without overriding any.
6555 void Sema::DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD) {
6556 if (MD->isInvalidDecl())
6559 if (Diags.isIgnored(diag::warn_overloaded_virtual, MD->getLocation()))
6562 SmallVector<CXXMethodDecl *, 8> OverloadedMethods;
6563 FindHiddenVirtualMethods(MD, OverloadedMethods);
6564 if (!OverloadedMethods.empty()) {
6565 Diag(MD->getLocation(), diag::warn_overloaded_virtual)
6566 << MD << (OverloadedMethods.size() > 1);
6568 NoteHiddenVirtualMethods(MD, OverloadedMethods);
6572 void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
6574 SourceLocation LBrac,
6575 SourceLocation RBrac,
6576 AttributeList *AttrList) {
6580 AdjustDeclIfTemplate(TagDecl);
6582 for (const AttributeList* l = AttrList; l; l = l->getNext()) {
6583 if (l->getKind() != AttributeList::AT_Visibility)
6586 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) <<
6590 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef(
6591 // strict aliasing violation!
6592 reinterpret_cast<Decl**>(FieldCollector->getCurFields()),
6593 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList);
6595 CheckCompletedCXXClass(
6596 dyn_cast_or_null<CXXRecordDecl>(TagDecl));
6599 /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
6600 /// special functions, such as the default constructor, copy
6601 /// constructor, or destructor, to the given C++ class (C++
6602 /// [special]p1). This routine can only be executed just before the
6603 /// definition of the class is complete.
6604 void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
6605 if (ClassDecl->needsImplicitDefaultConstructor()) {
6606 ++ASTContext::NumImplicitDefaultConstructors;
6608 if (ClassDecl->hasInheritedConstructor())
6609 DeclareImplicitDefaultConstructor(ClassDecl);
6612 if (ClassDecl->needsImplicitCopyConstructor()) {
6613 ++ASTContext::NumImplicitCopyConstructors;
6615 // If the properties or semantics of the copy constructor couldn't be
6616 // determined while the class was being declared, force a declaration
6618 if (ClassDecl->needsOverloadResolutionForCopyConstructor() ||
6619 ClassDecl->hasInheritedConstructor())
6620 DeclareImplicitCopyConstructor(ClassDecl);
6623 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) {
6624 ++ASTContext::NumImplicitMoveConstructors;
6626 if (ClassDecl->needsOverloadResolutionForMoveConstructor() ||
6627 ClassDecl->hasInheritedConstructor())
6628 DeclareImplicitMoveConstructor(ClassDecl);
6631 if (ClassDecl->needsImplicitCopyAssignment()) {
6632 ++ASTContext::NumImplicitCopyAssignmentOperators;
6634 // If we have a dynamic class, then the copy assignment operator may be
6635 // virtual, so we have to declare it immediately. This ensures that, e.g.,
6636 // it shows up in the right place in the vtable and that we diagnose
6637 // problems with the implicit exception specification.
6638 if (ClassDecl->isDynamicClass() ||
6639 ClassDecl->needsOverloadResolutionForCopyAssignment() ||
6640 ClassDecl->hasInheritedAssignment())
6641 DeclareImplicitCopyAssignment(ClassDecl);
6644 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) {
6645 ++ASTContext::NumImplicitMoveAssignmentOperators;
6647 // Likewise for the move assignment operator.
6648 if (ClassDecl->isDynamicClass() ||
6649 ClassDecl->needsOverloadResolutionForMoveAssignment() ||
6650 ClassDecl->hasInheritedAssignment())
6651 DeclareImplicitMoveAssignment(ClassDecl);
6654 if (ClassDecl->needsImplicitDestructor()) {
6655 ++ASTContext::NumImplicitDestructors;
6657 // If we have a dynamic class, then the destructor may be virtual, so we
6658 // have to declare the destructor immediately. This ensures that, e.g., it
6659 // shows up in the right place in the vtable and that we diagnose problems
6660 // with the implicit exception specification.
6661 if (ClassDecl->isDynamicClass() ||
6662 ClassDecl->needsOverloadResolutionForDestructor())
6663 DeclareImplicitDestructor(ClassDecl);
6667 unsigned Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) {
6671 // The order of template parameters is not important here. All names
6672 // get added to the same scope.
6673 SmallVector<TemplateParameterList *, 4> ParameterLists;
6675 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D))
6676 D = TD->getTemplatedDecl();
6678 if (auto *PSD = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
6679 ParameterLists.push_back(PSD->getTemplateParameters());
6681 if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) {
6682 for (unsigned i = 0; i < DD->getNumTemplateParameterLists(); ++i)
6683 ParameterLists.push_back(DD->getTemplateParameterList(i));
6685 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
6686 if (FunctionTemplateDecl *FTD = FD->getDescribedFunctionTemplate())
6687 ParameterLists.push_back(FTD->getTemplateParameters());
6691 if (TagDecl *TD = dyn_cast<TagDecl>(D)) {
6692 for (unsigned i = 0; i < TD->getNumTemplateParameterLists(); ++i)
6693 ParameterLists.push_back(TD->getTemplateParameterList(i));
6695 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) {
6696 if (ClassTemplateDecl *CTD = RD->getDescribedClassTemplate())
6697 ParameterLists.push_back(CTD->getTemplateParameters());
6702 for (TemplateParameterList *Params : ParameterLists) {
6703 if (Params->size() > 0)
6704 // Ignore explicit specializations; they don't contribute to the template
6707 for (NamedDecl *Param : *Params) {
6708 if (Param->getDeclName()) {
6710 IdResolver.AddDecl(Param);
6718 void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
6719 if (!RecordD) return;
6720 AdjustDeclIfTemplate(RecordD);
6721 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD);
6722 PushDeclContext(S, Record);
6725 void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) {
6726 if (!RecordD) return;
6730 /// This is used to implement the constant expression evaluation part of the
6731 /// attribute enable_if extension. There is nothing in standard C++ which would
6732 /// require reentering parameters.
6733 void Sema::ActOnReenterCXXMethodParameter(Scope *S, ParmVarDecl *Param) {
6738 if (Param->getDeclName())
6739 IdResolver.AddDecl(Param);
6742 /// ActOnStartDelayedCXXMethodDeclaration - We have completed
6743 /// parsing a top-level (non-nested) C++ class, and we are now
6744 /// parsing those parts of the given Method declaration that could
6745 /// not be parsed earlier (C++ [class.mem]p2), such as default
6746 /// arguments. This action should enter the scope of the given
6747 /// Method declaration as if we had just parsed the qualified method
6748 /// name. However, it should not bring the parameters into scope;
6749 /// that will be performed by ActOnDelayedCXXMethodParameter.
6750 void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
6753 /// ActOnDelayedCXXMethodParameter - We've already started a delayed
6754 /// C++ method declaration. We're (re-)introducing the given
6755 /// function parameter into scope for use in parsing later parts of
6756 /// the method declaration. For example, we could see an
6757 /// ActOnParamDefaultArgument event for this parameter.
6758 void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) {
6762 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD);
6764 // If this parameter has an unparsed default argument, clear it out
6765 // to make way for the parsed default argument.
6766 if (Param->hasUnparsedDefaultArg())
6767 Param->setDefaultArg(nullptr);
6770 if (Param->getDeclName())
6771 IdResolver.AddDecl(Param);
6774 /// ActOnFinishDelayedCXXMethodDeclaration - We have finished
6775 /// processing the delayed method declaration for Method. The method
6776 /// declaration is now considered finished. There may be a separate
6777 /// ActOnStartOfFunctionDef action later (not necessarily
6778 /// immediately!) for this method, if it was also defined inside the
6780 void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) {
6784 AdjustDeclIfTemplate(MethodD);
6786 FunctionDecl *Method = cast<FunctionDecl>(MethodD);
6788 // Now that we have our default arguments, check the constructor
6789 // again. It could produce additional diagnostics or affect whether
6790 // the class has implicitly-declared destructors, among other
6792 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method))
6793 CheckConstructor(Constructor);
6795 // Check the default arguments, which we may have added.
6796 if (!Method->isInvalidDecl())
6797 CheckCXXDefaultArguments(Method);
6800 /// CheckConstructorDeclarator - Called by ActOnDeclarator to check
6801 /// the well-formedness of the constructor declarator @p D with type @p
6802 /// R. If there are any errors in the declarator, this routine will
6803 /// emit diagnostics and set the invalid bit to true. In any case, the type
6804 /// will be updated to reflect a well-formed type for the constructor and
6806 QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R,
6808 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
6810 // C++ [class.ctor]p3:
6811 // A constructor shall not be virtual (10.3) or static (9.4). A
6812 // constructor can be invoked for a const, volatile or const
6813 // volatile object. A constructor shall not be declared const,
6814 // volatile, or const volatile (9.3.2).
6816 if (!D.isInvalidType())
6817 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
6818 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc())
6819 << SourceRange(D.getIdentifierLoc());
6822 if (SC == SC_Static) {
6823 if (!D.isInvalidType())
6824 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
6825 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
6826 << SourceRange(D.getIdentifierLoc());
6831 if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) {
6832 diagnoseIgnoredQualifiers(
6833 diag::err_constructor_return_type, TypeQuals, SourceLocation(),
6834 D.getDeclSpec().getConstSpecLoc(), D.getDeclSpec().getVolatileSpecLoc(),
6835 D.getDeclSpec().getRestrictSpecLoc(),
6836 D.getDeclSpec().getAtomicSpecLoc());
6840 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
6841 if (FTI.TypeQuals != 0) {
6842 if (FTI.TypeQuals & Qualifiers::Const)
6843 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
6844 << "const" << SourceRange(D.getIdentifierLoc());
6845 if (FTI.TypeQuals & Qualifiers::Volatile)
6846 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
6847 << "volatile" << SourceRange(D.getIdentifierLoc());
6848 if (FTI.TypeQuals & Qualifiers::Restrict)
6849 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
6850 << "restrict" << SourceRange(D.getIdentifierLoc());
6854 // C++0x [class.ctor]p4:
6855 // A constructor shall not be declared with a ref-qualifier.
6856 if (FTI.hasRefQualifier()) {
6857 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor)
6858 << FTI.RefQualifierIsLValueRef
6859 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
6863 // Rebuild the function type "R" without any type qualifiers (in
6864 // case any of the errors above fired) and with "void" as the
6865 // return type, since constructors don't have return types.
6866 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
6867 if (Proto->getReturnType() == Context.VoidTy && !D.isInvalidType())
6870 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
6872 EPI.RefQualifier = RQ_None;
6874 return Context.getFunctionType(Context.VoidTy, Proto->getParamTypes(), EPI);
6877 /// CheckConstructor - Checks a fully-formed constructor for
6878 /// well-formedness, issuing any diagnostics required. Returns true if
6879 /// the constructor declarator is invalid.
6880 void Sema::CheckConstructor(CXXConstructorDecl *Constructor) {
6881 CXXRecordDecl *ClassDecl
6882 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext());
6884 return Constructor->setInvalidDecl();
6886 // C++ [class.copy]p3:
6887 // A declaration of a constructor for a class X is ill-formed if
6888 // its first parameter is of type (optionally cv-qualified) X and
6889 // either there are no other parameters or else all other
6890 // parameters have default arguments.
6891 if (!Constructor->isInvalidDecl() &&
6892 ((Constructor->getNumParams() == 1) ||
6893 (Constructor->getNumParams() > 1 &&
6894 Constructor->getParamDecl(1)->hasDefaultArg())) &&
6895 Constructor->getTemplateSpecializationKind()
6896 != TSK_ImplicitInstantiation) {
6897 QualType ParamType = Constructor->getParamDecl(0)->getType();
6898 QualType ClassTy = Context.getTagDeclType(ClassDecl);
6899 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) {
6900 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation();
6901 const char *ConstRef
6902 = Constructor->getParamDecl(0)->getIdentifier() ? "const &"
6904 Diag(ParamLoc, diag::err_constructor_byvalue_arg)
6905 << FixItHint::CreateInsertion(ParamLoc, ConstRef);
6907 // FIXME: Rather that making the constructor invalid, we should endeavor
6909 Constructor->setInvalidDecl();
6914 /// CheckDestructor - Checks a fully-formed destructor definition for
6915 /// well-formedness, issuing any diagnostics required. Returns true
6917 bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) {
6918 CXXRecordDecl *RD = Destructor->getParent();
6920 if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) {
6923 if (!Destructor->isImplicit())
6924 Loc = Destructor->getLocation();
6926 Loc = RD->getLocation();
6928 // If we have a virtual destructor, look up the deallocation function
6929 FunctionDecl *OperatorDelete = nullptr;
6930 DeclarationName Name =
6931 Context.DeclarationNames.getCXXOperatorName(OO_Delete);
6932 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete))
6934 // If there's no class-specific operator delete, look up the global
6935 // non-array delete.
6936 if (!OperatorDelete)
6937 OperatorDelete = FindUsualDeallocationFunction(Loc, true, Name);
6939 MarkFunctionReferenced(Loc, OperatorDelete);
6941 Destructor->setOperatorDelete(OperatorDelete);
6947 /// CheckDestructorDeclarator - Called by ActOnDeclarator to check
6948 /// the well-formednes of the destructor declarator @p D with type @p
6949 /// R. If there are any errors in the declarator, this routine will
6950 /// emit diagnostics and set the declarator to invalid. Even if this happens,
6951 /// will be updated to reflect a well-formed type for the destructor and
6953 QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R,
6955 // C++ [class.dtor]p1:
6956 // [...] A typedef-name that names a class is a class-name
6957 // (7.1.3); however, a typedef-name that names a class shall not
6958 // be used as the identifier in the declarator for a destructor
6960 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName);
6961 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>())
6962 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
6963 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl());
6964 else if (const TemplateSpecializationType *TST =
6965 DeclaratorType->getAs<TemplateSpecializationType>())
6966 if (TST->isTypeAlias())
6967 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
6968 << DeclaratorType << 1;
6970 // C++ [class.dtor]p2:
6971 // A destructor is used to destroy objects of its class type. A
6972 // destructor takes no parameters, and no return type can be
6973 // specified for it (not even void). The address of a destructor
6974 // shall not be taken. A destructor shall not be static. A
6975 // destructor can be invoked for a const, volatile or const
6976 // volatile object. A destructor shall not be declared const,
6977 // volatile or const volatile (9.3.2).
6978 if (SC == SC_Static) {
6979 if (!D.isInvalidType())
6980 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be)
6981 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
6982 << SourceRange(D.getIdentifierLoc())
6983 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
6987 if (!D.isInvalidType()) {
6988 // Destructors don't have return types, but the parser will
6989 // happily parse something like:
6995 // The return type will be eliminated later.
6996 if (D.getDeclSpec().hasTypeSpecifier())
6997 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type)
6998 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
6999 << SourceRange(D.getIdentifierLoc());
7000 else if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) {
7001 diagnoseIgnoredQualifiers(diag::err_destructor_return_type, TypeQuals,
7003 D.getDeclSpec().getConstSpecLoc(),
7004 D.getDeclSpec().getVolatileSpecLoc(),
7005 D.getDeclSpec().getRestrictSpecLoc(),
7006 D.getDeclSpec().getAtomicSpecLoc());
7011 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
7012 if (FTI.TypeQuals != 0 && !D.isInvalidType()) {
7013 if (FTI.TypeQuals & Qualifiers::Const)
7014 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
7015 << "const" << SourceRange(D.getIdentifierLoc());
7016 if (FTI.TypeQuals & Qualifiers::Volatile)
7017 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
7018 << "volatile" << SourceRange(D.getIdentifierLoc());
7019 if (FTI.TypeQuals & Qualifiers::Restrict)
7020 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
7021 << "restrict" << SourceRange(D.getIdentifierLoc());
7025 // C++0x [class.dtor]p2:
7026 // A destructor shall not be declared with a ref-qualifier.
7027 if (FTI.hasRefQualifier()) {
7028 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor)
7029 << FTI.RefQualifierIsLValueRef
7030 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc());
7034 // Make sure we don't have any parameters.
7035 if (FTIHasNonVoidParameters(FTI)) {
7036 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params);
7038 // Delete the parameters.
7043 // Make sure the destructor isn't variadic.
7044 if (FTI.isVariadic) {
7045 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic);
7049 // Rebuild the function type "R" without any type qualifiers or
7050 // parameters (in case any of the errors above fired) and with
7051 // "void" as the return type, since destructors don't have return
7053 if (!D.isInvalidType())
7056 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
7057 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
7058 EPI.Variadic = false;
7060 EPI.RefQualifier = RQ_None;
7061 return Context.getFunctionType(Context.VoidTy, None, EPI);
7064 static void extendLeft(SourceRange &R, SourceRange Before) {
7065 if (Before.isInvalid())
7067 R.setBegin(Before.getBegin());
7068 if (R.getEnd().isInvalid())
7069 R.setEnd(Before.getEnd());
7072 static void extendRight(SourceRange &R, SourceRange After) {
7073 if (After.isInvalid())
7075 if (R.getBegin().isInvalid())
7076 R.setBegin(After.getBegin());
7077 R.setEnd(After.getEnd());
7080 /// CheckConversionDeclarator - Called by ActOnDeclarator to check the
7081 /// well-formednes of the conversion function declarator @p D with
7082 /// type @p R. If there are any errors in the declarator, this routine
7083 /// will emit diagnostics and return true. Otherwise, it will return
7084 /// false. Either way, the type @p R will be updated to reflect a
7085 /// well-formed type for the conversion operator.
7086 void Sema::CheckConversionDeclarator(Declarator &D, QualType &R,
7088 // C++ [class.conv.fct]p1:
7089 // Neither parameter types nor return type can be specified. The
7090 // type of a conversion function (8.3.5) is "function taking no
7091 // parameter returning conversion-type-id."
7092 if (SC == SC_Static) {
7093 if (!D.isInvalidType())
7094 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member)
7095 << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
7096 << D.getName().getSourceRange();
7101 TypeSourceInfo *ConvTSI = nullptr;
7103 GetTypeFromParser(D.getName().ConversionFunctionId, &ConvTSI);
7105 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
7106 // Conversion functions don't have return types, but the parser will
7107 // happily parse something like:
7110 // float operator bool();
7113 // The return type will be changed later anyway.
7114 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type)
7115 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
7116 << SourceRange(D.getIdentifierLoc());
7120 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
7122 // Make sure we don't have any parameters.
7123 if (Proto->getNumParams() > 0) {
7124 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params);
7126 // Delete the parameters.
7127 D.getFunctionTypeInfo().freeParams();
7129 } else if (Proto->isVariadic()) {
7130 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic);
7134 // Diagnose "&operator bool()" and other such nonsense. This
7135 // is actually a gcc extension which we don't support.
7136 if (Proto->getReturnType() != ConvType) {
7137 bool NeedsTypedef = false;
7138 SourceRange Before, After;
7140 // Walk the chunks and extract information on them for our diagnostic.
7141 bool PastFunctionChunk = false;
7142 for (auto &Chunk : D.type_objects()) {
7143 switch (Chunk.Kind) {
7144 case DeclaratorChunk::Function:
7145 if (!PastFunctionChunk) {
7146 if (Chunk.Fun.HasTrailingReturnType) {
7147 TypeSourceInfo *TRT = nullptr;
7148 GetTypeFromParser(Chunk.Fun.getTrailingReturnType(), &TRT);
7149 if (TRT) extendRight(After, TRT->getTypeLoc().getSourceRange());
7151 PastFunctionChunk = true;
7155 case DeclaratorChunk::Array:
7156 NeedsTypedef = true;
7157 extendRight(After, Chunk.getSourceRange());
7160 case DeclaratorChunk::Pointer:
7161 case DeclaratorChunk::BlockPointer:
7162 case DeclaratorChunk::Reference:
7163 case DeclaratorChunk::MemberPointer:
7164 case DeclaratorChunk::Pipe:
7165 extendLeft(Before, Chunk.getSourceRange());
7168 case DeclaratorChunk::Paren:
7169 extendLeft(Before, Chunk.Loc);
7170 extendRight(After, Chunk.EndLoc);
7175 SourceLocation Loc = Before.isValid() ? Before.getBegin() :
7176 After.isValid() ? After.getBegin() :
7177 D.getIdentifierLoc();
7178 auto &&DB = Diag(Loc, diag::err_conv_function_with_complex_decl);
7179 DB << Before << After;
7181 if (!NeedsTypedef) {
7182 DB << /*don't need a typedef*/0;
7184 // If we can provide a correct fix-it hint, do so.
7185 if (After.isInvalid() && ConvTSI) {
7186 SourceLocation InsertLoc =
7187 getLocForEndOfToken(ConvTSI->getTypeLoc().getLocEnd());
7188 DB << FixItHint::CreateInsertion(InsertLoc, " ")
7189 << FixItHint::CreateInsertionFromRange(
7190 InsertLoc, CharSourceRange::getTokenRange(Before))
7191 << FixItHint::CreateRemoval(Before);
7193 } else if (!Proto->getReturnType()->isDependentType()) {
7194 DB << /*typedef*/1 << Proto->getReturnType();
7195 } else if (getLangOpts().CPlusPlus11) {
7196 DB << /*alias template*/2 << Proto->getReturnType();
7198 DB << /*might not be fixable*/3;
7201 // Recover by incorporating the other type chunks into the result type.
7202 // Note, this does *not* change the name of the function. This is compatible
7203 // with the GCC extension:
7204 // struct S { &operator int(); } s;
7205 // int &r = s.operator int(); // ok in GCC
7206 // S::operator int&() {} // error in GCC, function name is 'operator int'.
7207 ConvType = Proto->getReturnType();
7210 // C++ [class.conv.fct]p4:
7211 // The conversion-type-id shall not represent a function type nor
7213 if (ConvType->isArrayType()) {
7214 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array);
7215 ConvType = Context.getPointerType(ConvType);
7217 } else if (ConvType->isFunctionType()) {
7218 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function);
7219 ConvType = Context.getPointerType(ConvType);
7223 // Rebuild the function type "R" without any parameters (in case any
7224 // of the errors above fired) and with the conversion type as the
7226 if (D.isInvalidType())
7227 R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo());
7229 // C++0x explicit conversion operators.
7230 if (D.getDeclSpec().isExplicitSpecified())
7231 Diag(D.getDeclSpec().getExplicitSpecLoc(),
7232 getLangOpts().CPlusPlus11 ?
7233 diag::warn_cxx98_compat_explicit_conversion_functions :
7234 diag::ext_explicit_conversion_functions)
7235 << SourceRange(D.getDeclSpec().getExplicitSpecLoc());
7238 /// ActOnConversionDeclarator - Called by ActOnDeclarator to complete
7239 /// the declaration of the given C++ conversion function. This routine
7240 /// is responsible for recording the conversion function in the C++
7241 /// class, if possible.
7242 Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) {
7243 assert(Conversion && "Expected to receive a conversion function declaration");
7245 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext());
7247 // Make sure we aren't redeclaring the conversion function.
7248 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType());
7250 // C++ [class.conv.fct]p1:
7251 // [...] A conversion function is never used to convert a
7252 // (possibly cv-qualified) object to the (possibly cv-qualified)
7253 // same object type (or a reference to it), to a (possibly
7254 // cv-qualified) base class of that type (or a reference to it),
7255 // or to (possibly cv-qualified) void.
7256 // FIXME: Suppress this warning if the conversion function ends up being a
7257 // virtual function that overrides a virtual function in a base class.
7259 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
7260 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>())
7261 ConvType = ConvTypeRef->getPointeeType();
7262 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared &&
7263 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization)
7264 /* Suppress diagnostics for instantiations. */;
7265 else if (ConvType->isRecordType()) {
7266 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType();
7267 if (ConvType == ClassType)
7268 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used)
7270 else if (IsDerivedFrom(Conversion->getLocation(), ClassType, ConvType))
7271 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used)
7272 << ClassType << ConvType;
7273 } else if (ConvType->isVoidType()) {
7274 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used)
7275 << ClassType << ConvType;
7278 if (FunctionTemplateDecl *ConversionTemplate
7279 = Conversion->getDescribedFunctionTemplate())
7280 return ConversionTemplate;
7285 //===----------------------------------------------------------------------===//
7286 // Namespace Handling
7287 //===----------------------------------------------------------------------===//
7289 /// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is
7291 static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc,
7293 IdentifierInfo *II, bool *IsInline,
7294 NamespaceDecl *PrevNS) {
7295 assert(*IsInline != PrevNS->isInline());
7297 // HACK: Work around a bug in libstdc++4.6's <atomic>, where
7298 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as
7299 // inline namespaces, with the intention of bringing names into namespace std.
7301 // We support this just well enough to get that case working; this is not
7302 // sufficient to support reopening namespaces as inline in general.
7303 if (*IsInline && II && II->getName().startswith("__atomic") &&
7304 S.getSourceManager().isInSystemHeader(Loc)) {
7305 // Mark all prior declarations of the namespace as inline.
7306 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS;
7307 NS = NS->getPreviousDecl())
7308 NS->setInline(*IsInline);
7309 // Patch up the lookup table for the containing namespace. This isn't really
7310 // correct, but it's good enough for this particular case.
7311 for (auto *I : PrevNS->decls())
7312 if (auto *ND = dyn_cast<NamedDecl>(I))
7313 PrevNS->getParent()->makeDeclVisibleInContext(ND);
7317 if (PrevNS->isInline())
7318 // The user probably just forgot the 'inline', so suggest that it
7320 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline)
7321 << FixItHint::CreateInsertion(KeywordLoc, "inline ");
7323 S.Diag(Loc, diag::err_inline_namespace_mismatch) << *IsInline;
7325 S.Diag(PrevNS->getLocation(), diag::note_previous_definition);
7326 *IsInline = PrevNS->isInline();
7329 /// ActOnStartNamespaceDef - This is called at the start of a namespace
7331 Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope,
7332 SourceLocation InlineLoc,
7333 SourceLocation NamespaceLoc,
7334 SourceLocation IdentLoc,
7336 SourceLocation LBrace,
7337 AttributeList *AttrList,
7338 UsingDirectiveDecl *&UD) {
7339 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc;
7340 // For anonymous namespace, take the location of the left brace.
7341 SourceLocation Loc = II ? IdentLoc : LBrace;
7342 bool IsInline = InlineLoc.isValid();
7343 bool IsInvalid = false;
7345 bool AddToKnown = false;
7346 Scope *DeclRegionScope = NamespcScope->getParent();
7348 NamespaceDecl *PrevNS = nullptr;
7350 // C++ [namespace.def]p2:
7351 // The identifier in an original-namespace-definition shall not
7352 // have been previously defined in the declarative region in
7353 // which the original-namespace-definition appears. The
7354 // identifier in an original-namespace-definition is the name of
7355 // the namespace. Subsequently in that declarative region, it is
7356 // treated as an original-namespace-name.
7358 // Since namespace names are unique in their scope, and we don't
7359 // look through using directives, just look for any ordinary names
7360 // as if by qualified name lookup.
7361 LookupResult R(*this, II, IdentLoc, LookupOrdinaryName, ForRedeclaration);
7362 LookupQualifiedName(R, CurContext->getRedeclContext());
7363 NamedDecl *PrevDecl =
7364 R.isSingleResult() ? R.getRepresentativeDecl() : nullptr;
7365 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl);
7368 // This is an extended namespace definition.
7369 if (IsInline != PrevNS->isInline())
7370 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II,
7372 } else if (PrevDecl) {
7373 // This is an invalid name redefinition.
7374 Diag(Loc, diag::err_redefinition_different_kind)
7376 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
7378 // Continue on to push Namespc as current DeclContext and return it.
7379 } else if (II->isStr("std") &&
7380 CurContext->getRedeclContext()->isTranslationUnit()) {
7381 // This is the first "real" definition of the namespace "std", so update
7382 // our cache of the "std" namespace to point at this definition.
7383 PrevNS = getStdNamespace();
7385 AddToKnown = !IsInline;
7387 // We've seen this namespace for the first time.
7388 AddToKnown = !IsInline;
7391 // Anonymous namespaces.
7393 // Determine whether the parent already has an anonymous namespace.
7394 DeclContext *Parent = CurContext->getRedeclContext();
7395 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
7396 PrevNS = TU->getAnonymousNamespace();
7398 NamespaceDecl *ND = cast<NamespaceDecl>(Parent);
7399 PrevNS = ND->getAnonymousNamespace();
7402 if (PrevNS && IsInline != PrevNS->isInline())
7403 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II,
7407 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline,
7408 StartLoc, Loc, II, PrevNS);
7410 Namespc->setInvalidDecl();
7412 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList);
7414 // FIXME: Should we be merging attributes?
7415 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>())
7416 PushNamespaceVisibilityAttr(Attr, Loc);
7419 StdNamespace = Namespc;
7421 KnownNamespaces[Namespc] = false;
7424 PushOnScopeChains(Namespc, DeclRegionScope);
7426 // Link the anonymous namespace into its parent.
7427 DeclContext *Parent = CurContext->getRedeclContext();
7428 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
7429 TU->setAnonymousNamespace(Namespc);
7431 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc);
7434 CurContext->addDecl(Namespc);
7436 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition
7437 // behaves as if it were replaced by
7438 // namespace unique { /* empty body */ }
7439 // using namespace unique;
7440 // namespace unique { namespace-body }
7441 // where all occurrences of 'unique' in a translation unit are
7442 // replaced by the same identifier and this identifier differs
7443 // from all other identifiers in the entire program.
7445 // We just create the namespace with an empty name and then add an
7446 // implicit using declaration, just like the standard suggests.
7448 // CodeGen enforces the "universally unique" aspect by giving all
7449 // declarations semantically contained within an anonymous
7450 // namespace internal linkage.
7453 UD = UsingDirectiveDecl::Create(Context, Parent,
7454 /* 'using' */ LBrace,
7455 /* 'namespace' */ SourceLocation(),
7456 /* qualifier */ NestedNameSpecifierLoc(),
7457 /* identifier */ SourceLocation(),
7459 /* Ancestor */ Parent);
7461 Parent->addDecl(UD);
7465 ActOnDocumentableDecl(Namespc);
7467 // Although we could have an invalid decl (i.e. the namespace name is a
7468 // redefinition), push it as current DeclContext and try to continue parsing.
7469 // FIXME: We should be able to push Namespc here, so that the each DeclContext
7470 // for the namespace has the declarations that showed up in that particular
7471 // namespace definition.
7472 PushDeclContext(NamespcScope, Namespc);
7476 /// getNamespaceDecl - Returns the namespace a decl represents. If the decl
7477 /// is a namespace alias, returns the namespace it points to.
7478 static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) {
7479 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D))
7480 return AD->getNamespace();
7481 return dyn_cast_or_null<NamespaceDecl>(D);
7484 /// ActOnFinishNamespaceDef - This callback is called after a namespace is
7485 /// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef.
7486 void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) {
7487 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl);
7488 assert(Namespc && "Invalid parameter, expected NamespaceDecl");
7489 Namespc->setRBraceLoc(RBrace);
7491 if (Namespc->hasAttr<VisibilityAttr>())
7492 PopPragmaVisibility(true, RBrace);
7495 CXXRecordDecl *Sema::getStdBadAlloc() const {
7496 return cast_or_null<CXXRecordDecl>(
7497 StdBadAlloc.get(Context.getExternalSource()));
7500 NamespaceDecl *Sema::getStdNamespace() const {
7501 return cast_or_null<NamespaceDecl>(
7502 StdNamespace.get(Context.getExternalSource()));
7505 /// \brief Retrieve the special "std" namespace, which may require us to
7506 /// implicitly define the namespace.
7507 NamespaceDecl *Sema::getOrCreateStdNamespace() {
7508 if (!StdNamespace) {
7509 // The "std" namespace has not yet been defined, so build one implicitly.
7510 StdNamespace = NamespaceDecl::Create(Context,
7511 Context.getTranslationUnitDecl(),
7513 SourceLocation(), SourceLocation(),
7514 &PP.getIdentifierTable().get("std"),
7515 /*PrevDecl=*/nullptr);
7516 getStdNamespace()->setImplicit(true);
7519 return getStdNamespace();
7522 bool Sema::isStdInitializerList(QualType Ty, QualType *Element) {
7523 assert(getLangOpts().CPlusPlus &&
7524 "Looking for std::initializer_list outside of C++.");
7526 // We're looking for implicit instantiations of
7527 // template <typename E> class std::initializer_list.
7529 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it.
7532 ClassTemplateDecl *Template = nullptr;
7533 const TemplateArgument *Arguments = nullptr;
7535 if (const RecordType *RT = Ty->getAs<RecordType>()) {
7537 ClassTemplateSpecializationDecl *Specialization =
7538 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl());
7539 if (!Specialization)
7542 Template = Specialization->getSpecializedTemplate();
7543 Arguments = Specialization->getTemplateArgs().data();
7544 } else if (const TemplateSpecializationType *TST =
7545 Ty->getAs<TemplateSpecializationType>()) {
7546 Template = dyn_cast_or_null<ClassTemplateDecl>(
7547 TST->getTemplateName().getAsTemplateDecl());
7548 Arguments = TST->getArgs();
7553 if (!StdInitializerList) {
7554 // Haven't recognized std::initializer_list yet, maybe this is it.
7555 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl();
7556 if (TemplateClass->getIdentifier() !=
7557 &PP.getIdentifierTable().get("initializer_list") ||
7558 !getStdNamespace()->InEnclosingNamespaceSetOf(
7559 TemplateClass->getDeclContext()))
7561 // This is a template called std::initializer_list, but is it the right
7563 TemplateParameterList *Params = Template->getTemplateParameters();
7564 if (Params->getMinRequiredArguments() != 1)
7566 if (!isa<TemplateTypeParmDecl>(Params->getParam(0)))
7569 // It's the right template.
7570 StdInitializerList = Template;
7573 if (Template->getCanonicalDecl() != StdInitializerList->getCanonicalDecl())
7576 // This is an instance of std::initializer_list. Find the argument type.
7578 *Element = Arguments[0].getAsType();
7582 static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){
7583 NamespaceDecl *Std = S.getStdNamespace();
7585 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
7589 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"),
7590 Loc, Sema::LookupOrdinaryName);
7591 if (!S.LookupQualifiedName(Result, Std)) {
7592 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found);
7595 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>();
7597 Result.suppressDiagnostics();
7598 // We found something weird. Complain about the first thing we found.
7599 NamedDecl *Found = *Result.begin();
7600 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list);
7604 // We found some template called std::initializer_list. Now verify that it's
7606 TemplateParameterList *Params = Template->getTemplateParameters();
7607 if (Params->getMinRequiredArguments() != 1 ||
7608 !isa<TemplateTypeParmDecl>(Params->getParam(0))) {
7609 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list);
7616 QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) {
7617 if (!StdInitializerList) {
7618 StdInitializerList = LookupStdInitializerList(*this, Loc);
7619 if (!StdInitializerList)
7623 TemplateArgumentListInfo Args(Loc, Loc);
7624 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element),
7625 Context.getTrivialTypeSourceInfo(Element,
7627 return Context.getCanonicalType(
7628 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args));
7631 bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) {
7632 // C++ [dcl.init.list]p2:
7633 // A constructor is an initializer-list constructor if its first parameter
7634 // is of type std::initializer_list<E> or reference to possibly cv-qualified
7635 // std::initializer_list<E> for some type E, and either there are no other
7636 // parameters or else all other parameters have default arguments.
7637 if (Ctor->getNumParams() < 1 ||
7638 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg()))
7641 QualType ArgType = Ctor->getParamDecl(0)->getType();
7642 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>())
7643 ArgType = RT->getPointeeType().getUnqualifiedType();
7645 return isStdInitializerList(ArgType, nullptr);
7648 /// \brief Determine whether a using statement is in a context where it will be
7649 /// apply in all contexts.
7650 static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) {
7651 switch (CurContext->getDeclKind()) {
7652 case Decl::TranslationUnit:
7654 case Decl::LinkageSpec:
7655 return IsUsingDirectiveInToplevelContext(CurContext->getParent());
7663 // Callback to only accept typo corrections that are namespaces.
7664 class NamespaceValidatorCCC : public CorrectionCandidateCallback {
7666 bool ValidateCandidate(const TypoCorrection &candidate) override {
7667 if (NamedDecl *ND = candidate.getCorrectionDecl())
7668 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND);
7675 static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc,
7677 SourceLocation IdentLoc,
7678 IdentifierInfo *Ident) {
7680 if (TypoCorrection Corrected =
7681 S.CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), Sc, &SS,
7682 llvm::make_unique<NamespaceValidatorCCC>(),
7683 Sema::CTK_ErrorRecovery)) {
7684 if (DeclContext *DC = S.computeDeclContext(SS, false)) {
7685 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts()));
7686 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
7687 Ident->getName().equals(CorrectedStr);
7688 S.diagnoseTypo(Corrected,
7689 S.PDiag(diag::err_using_directive_member_suggest)
7690 << Ident << DC << DroppedSpecifier << SS.getRange(),
7691 S.PDiag(diag::note_namespace_defined_here));
7693 S.diagnoseTypo(Corrected,
7694 S.PDiag(diag::err_using_directive_suggest) << Ident,
7695 S.PDiag(diag::note_namespace_defined_here));
7697 R.addDecl(Corrected.getFoundDecl());
7703 Decl *Sema::ActOnUsingDirective(Scope *S,
7704 SourceLocation UsingLoc,
7705 SourceLocation NamespcLoc,
7707 SourceLocation IdentLoc,
7708 IdentifierInfo *NamespcName,
7709 AttributeList *AttrList) {
7710 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
7711 assert(NamespcName && "Invalid NamespcName.");
7712 assert(IdentLoc.isValid() && "Invalid NamespceName location.");
7714 // This can only happen along a recovery path.
7715 while (S->isTemplateParamScope())
7717 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
7719 UsingDirectiveDecl *UDir = nullptr;
7720 NestedNameSpecifier *Qualifier = nullptr;
7722 Qualifier = SS.getScopeRep();
7724 // Lookup namespace name.
7725 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName);
7726 LookupParsedName(R, S, &SS);
7727 if (R.isAmbiguous())
7732 // Allow "using namespace std;" or "using namespace ::std;" even if
7733 // "std" hasn't been defined yet, for GCC compatibility.
7734 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) &&
7735 NamespcName->isStr("std")) {
7736 Diag(IdentLoc, diag::ext_using_undefined_std);
7737 R.addDecl(getOrCreateStdNamespace());
7740 // Otherwise, attempt typo correction.
7741 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName);
7745 NamedDecl *Named = R.getRepresentativeDecl();
7746 NamespaceDecl *NS = R.getAsSingle<NamespaceDecl>();
7747 assert(NS && "expected namespace decl");
7749 // The use of a nested name specifier may trigger deprecation warnings.
7750 DiagnoseUseOfDecl(Named, IdentLoc);
7752 // C++ [namespace.udir]p1:
7753 // A using-directive specifies that the names in the nominated
7754 // namespace can be used in the scope in which the
7755 // using-directive appears after the using-directive. During
7756 // unqualified name lookup (3.4.1), the names appear as if they
7757 // were declared in the nearest enclosing namespace which
7758 // contains both the using-directive and the nominated
7759 // namespace. [Note: in this context, "contains" means "contains
7760 // directly or indirectly". ]
7762 // Find enclosing context containing both using-directive and
7763 // nominated namespace.
7764 DeclContext *CommonAncestor = cast<DeclContext>(NS);
7765 while (CommonAncestor && !CommonAncestor->Encloses(CurContext))
7766 CommonAncestor = CommonAncestor->getParent();
7768 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc,
7769 SS.getWithLocInContext(Context),
7770 IdentLoc, Named, CommonAncestor);
7772 if (IsUsingDirectiveInToplevelContext(CurContext) &&
7773 !SourceMgr.isInMainFile(SourceMgr.getExpansionLoc(IdentLoc))) {
7774 Diag(IdentLoc, diag::warn_using_directive_in_header);
7777 PushUsingDirective(S, UDir);
7779 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
7783 ProcessDeclAttributeList(S, UDir, AttrList);
7788 void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) {
7789 // If the scope has an associated entity and the using directive is at
7790 // namespace or translation unit scope, add the UsingDirectiveDecl into
7791 // its lookup structure so qualified name lookup can find it.
7792 DeclContext *Ctx = S->getEntity();
7793 if (Ctx && !Ctx->isFunctionOrMethod())
7796 // Otherwise, it is at block scope. The using-directives will affect lookup
7797 // only to the end of the scope.
7798 S->PushUsingDirective(UDir);
7802 Decl *Sema::ActOnUsingDeclaration(Scope *S,
7804 bool HasUsingKeyword,
7805 SourceLocation UsingLoc,
7807 UnqualifiedId &Name,
7808 AttributeList *AttrList,
7809 bool HasTypenameKeyword,
7810 SourceLocation TypenameLoc) {
7811 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
7813 switch (Name.getKind()) {
7814 case UnqualifiedId::IK_ImplicitSelfParam:
7815 case UnqualifiedId::IK_Identifier:
7816 case UnqualifiedId::IK_OperatorFunctionId:
7817 case UnqualifiedId::IK_LiteralOperatorId:
7818 case UnqualifiedId::IK_ConversionFunctionId:
7821 case UnqualifiedId::IK_ConstructorName:
7822 case UnqualifiedId::IK_ConstructorTemplateId:
7823 // C++11 inheriting constructors.
7824 Diag(Name.getLocStart(),
7825 getLangOpts().CPlusPlus11 ?
7826 diag::warn_cxx98_compat_using_decl_constructor :
7827 diag::err_using_decl_constructor)
7830 if (getLangOpts().CPlusPlus11) break;
7834 case UnqualifiedId::IK_DestructorName:
7835 Diag(Name.getLocStart(), diag::err_using_decl_destructor)
7839 case UnqualifiedId::IK_TemplateId:
7840 Diag(Name.getLocStart(), diag::err_using_decl_template_id)
7841 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc);
7845 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name);
7846 DeclarationName TargetName = TargetNameInfo.getName();
7850 // Warn about access declarations.
7851 if (!HasUsingKeyword) {
7852 Diag(Name.getLocStart(),
7853 getLangOpts().CPlusPlus11 ? diag::err_access_decl
7854 : diag::warn_access_decl_deprecated)
7855 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using ");
7858 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) ||
7859 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration))
7862 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS,
7863 TargetNameInfo, AttrList,
7864 /* IsInstantiation */ false,
7865 HasTypenameKeyword, TypenameLoc);
7867 PushOnScopeChains(UD, S, /*AddToContext*/ false);
7872 /// \brief Determine whether a using declaration considers the given
7873 /// declarations as "equivalent", e.g., if they are redeclarations of
7874 /// the same entity or are both typedefs of the same type.
7876 IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2) {
7877 if (D1->getCanonicalDecl() == D2->getCanonicalDecl())
7880 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1))
7881 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2))
7882 return Context.hasSameType(TD1->getUnderlyingType(),
7883 TD2->getUnderlyingType());
7889 /// Determines whether to create a using shadow decl for a particular
7890 /// decl, given the set of decls existing prior to this using lookup.
7891 bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig,
7892 const LookupResult &Previous,
7893 UsingShadowDecl *&PrevShadow) {
7894 // Diagnose finding a decl which is not from a base class of the
7895 // current class. We do this now because there are cases where this
7896 // function will silently decide not to build a shadow decl, which
7897 // will pre-empt further diagnostics.
7899 // We don't need to do this in C++11 because we do the check once on
7902 // FIXME: diagnose the following if we care enough:
7903 // struct A { int foo; };
7904 // struct B : A { using A::foo; };
7905 // template <class T> struct C : A {};
7906 // template <class T> struct D : C<T> { using B::foo; } // <---
7907 // This is invalid (during instantiation) in C++03 because B::foo
7908 // resolves to the using decl in B, which is not a base class of D<T>.
7909 // We can't diagnose it immediately because C<T> is an unknown
7910 // specialization. The UsingShadowDecl in D<T> then points directly
7911 // to A::foo, which will look well-formed when we instantiate.
7912 // The right solution is to not collapse the shadow-decl chain.
7913 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) {
7914 DeclContext *OrigDC = Orig->getDeclContext();
7916 // Handle enums and anonymous structs.
7917 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent();
7918 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC);
7919 while (OrigRec->isAnonymousStructOrUnion())
7920 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext());
7922 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) {
7923 if (OrigDC == CurContext) {
7924 Diag(Using->getLocation(),
7925 diag::err_using_decl_nested_name_specifier_is_current_class)
7926 << Using->getQualifierLoc().getSourceRange();
7927 Diag(Orig->getLocation(), diag::note_using_decl_target);
7931 Diag(Using->getQualifierLoc().getBeginLoc(),
7932 diag::err_using_decl_nested_name_specifier_is_not_base_class)
7933 << Using->getQualifier()
7934 << cast<CXXRecordDecl>(CurContext)
7935 << Using->getQualifierLoc().getSourceRange();
7936 Diag(Orig->getLocation(), diag::note_using_decl_target);
7941 if (Previous.empty()) return false;
7943 NamedDecl *Target = Orig;
7944 if (isa<UsingShadowDecl>(Target))
7945 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
7947 // If the target happens to be one of the previous declarations, we
7948 // don't have a conflict.
7950 // FIXME: but we might be increasing its access, in which case we
7951 // should redeclare it.
7952 NamedDecl *NonTag = nullptr, *Tag = nullptr;
7953 bool FoundEquivalentDecl = false;
7954 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
7956 NamedDecl *D = (*I)->getUnderlyingDecl();
7957 // We can have UsingDecls in our Previous results because we use the same
7958 // LookupResult for checking whether the UsingDecl itself is a valid
7960 if (isa<UsingDecl>(D))
7963 if (IsEquivalentForUsingDecl(Context, D, Target)) {
7964 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(*I))
7965 PrevShadow = Shadow;
7966 FoundEquivalentDecl = true;
7967 } else if (isEquivalentInternalLinkageDeclaration(D, Target)) {
7968 // We don't conflict with an existing using shadow decl of an equivalent
7969 // declaration, but we're not a redeclaration of it.
7970 FoundEquivalentDecl = true;
7974 (isa<TagDecl>(D) ? Tag : NonTag) = D;
7977 if (FoundEquivalentDecl)
7980 if (FunctionDecl *FD = Target->getAsFunction()) {
7981 NamedDecl *OldDecl = nullptr;
7982 switch (CheckOverload(nullptr, FD, Previous, OldDecl,
7983 /*IsForUsingDecl*/ true)) {
7987 case Ovl_NonFunction:
7988 Diag(Using->getLocation(), diag::err_using_decl_conflict);
7991 // We found a decl with the exact signature.
7993 // If we're in a record, we want to hide the target, so we
7994 // return true (without a diagnostic) to tell the caller not to
7995 // build a shadow decl.
7996 if (CurContext->isRecord())
7999 // If we're not in a record, this is an error.
8000 Diag(Using->getLocation(), diag::err_using_decl_conflict);
8004 Diag(Target->getLocation(), diag::note_using_decl_target);
8005 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict);
8009 // Target is not a function.
8011 if (isa<TagDecl>(Target)) {
8012 // No conflict between a tag and a non-tag.
8013 if (!Tag) return false;
8015 Diag(Using->getLocation(), diag::err_using_decl_conflict);
8016 Diag(Target->getLocation(), diag::note_using_decl_target);
8017 Diag(Tag->getLocation(), diag::note_using_decl_conflict);
8021 // No conflict between a tag and a non-tag.
8022 if (!NonTag) return false;
8024 Diag(Using->getLocation(), diag::err_using_decl_conflict);
8025 Diag(Target->getLocation(), diag::note_using_decl_target);
8026 Diag(NonTag->getLocation(), diag::note_using_decl_conflict);
8030 /// Determine whether a direct base class is a virtual base class.
8031 static bool isVirtualDirectBase(CXXRecordDecl *Derived, CXXRecordDecl *Base) {
8032 if (!Derived->getNumVBases())
8034 for (auto &B : Derived->bases())
8035 if (B.getType()->getAsCXXRecordDecl() == Base)
8036 return B.isVirtual();
8037 llvm_unreachable("not a direct base class");
8040 /// Builds a shadow declaration corresponding to a 'using' declaration.
8041 UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S,
8044 UsingShadowDecl *PrevDecl) {
8045 // If we resolved to another shadow declaration, just coalesce them.
8046 NamedDecl *Target = Orig;
8047 if (isa<UsingShadowDecl>(Target)) {
8048 Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
8049 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration");
8052 NamedDecl *NonTemplateTarget = Target;
8053 if (auto *TargetTD = dyn_cast<TemplateDecl>(Target))
8054 NonTemplateTarget = TargetTD->getTemplatedDecl();
8056 UsingShadowDecl *Shadow;
8057 if (isa<CXXConstructorDecl>(NonTemplateTarget)) {
8058 bool IsVirtualBase =
8059 isVirtualDirectBase(cast<CXXRecordDecl>(CurContext),
8060 UD->getQualifier()->getAsRecordDecl());
8061 Shadow = ConstructorUsingShadowDecl::Create(
8062 Context, CurContext, UD->getLocation(), UD, Orig, IsVirtualBase);
8064 Shadow = UsingShadowDecl::Create(Context, CurContext, UD->getLocation(), UD,
8067 UD->addShadowDecl(Shadow);
8069 Shadow->setAccess(UD->getAccess());
8070 if (Orig->isInvalidDecl() || UD->isInvalidDecl())
8071 Shadow->setInvalidDecl();
8073 Shadow->setPreviousDecl(PrevDecl);
8076 PushOnScopeChains(Shadow, S);
8078 CurContext->addDecl(Shadow);
8084 /// Hides a using shadow declaration. This is required by the current
8085 /// using-decl implementation when a resolvable using declaration in a
8086 /// class is followed by a declaration which would hide or override
8087 /// one or more of the using decl's targets; for example:
8089 /// struct Base { void foo(int); };
8090 /// struct Derived : Base {
8091 /// using Base::foo;
8095 /// The governing language is C++03 [namespace.udecl]p12:
8097 /// When a using-declaration brings names from a base class into a
8098 /// derived class scope, member functions in the derived class
8099 /// override and/or hide member functions with the same name and
8100 /// parameter types in a base class (rather than conflicting).
8102 /// There are two ways to implement this:
8103 /// (1) optimistically create shadow decls when they're not hidden
8104 /// by existing declarations, or
8105 /// (2) don't create any shadow decls (or at least don't make them
8106 /// visible) until we've fully parsed/instantiated the class.
8107 /// The problem with (1) is that we might have to retroactively remove
8108 /// a shadow decl, which requires several O(n) operations because the
8109 /// decl structures are (very reasonably) not designed for removal.
8110 /// (2) avoids this but is very fiddly and phase-dependent.
8111 void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) {
8112 if (Shadow->getDeclName().getNameKind() ==
8113 DeclarationName::CXXConversionFunctionName)
8114 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow);
8116 // Remove it from the DeclContext...
8117 Shadow->getDeclContext()->removeDecl(Shadow);
8119 // ...and the scope, if applicable...
8121 S->RemoveDecl(Shadow);
8122 IdResolver.RemoveDecl(Shadow);
8125 // ...and the using decl.
8126 Shadow->getUsingDecl()->removeShadowDecl(Shadow);
8128 // TODO: complain somehow if Shadow was used. It shouldn't
8129 // be possible for this to happen, because...?
8132 /// Find the base specifier for a base class with the given type.
8133 static CXXBaseSpecifier *findDirectBaseWithType(CXXRecordDecl *Derived,
8134 QualType DesiredBase,
8135 bool &AnyDependentBases) {
8136 // Check whether the named type is a direct base class.
8137 CanQualType CanonicalDesiredBase = DesiredBase->getCanonicalTypeUnqualified();
8138 for (auto &Base : Derived->bases()) {
8139 CanQualType BaseType = Base.getType()->getCanonicalTypeUnqualified();
8140 if (CanonicalDesiredBase == BaseType)
8142 if (BaseType->isDependentType())
8143 AnyDependentBases = true;
8149 class UsingValidatorCCC : public CorrectionCandidateCallback {
8151 UsingValidatorCCC(bool HasTypenameKeyword, bool IsInstantiation,
8152 NestedNameSpecifier *NNS, CXXRecordDecl *RequireMemberOf)
8153 : HasTypenameKeyword(HasTypenameKeyword),
8154 IsInstantiation(IsInstantiation), OldNNS(NNS),
8155 RequireMemberOf(RequireMemberOf) {}
8157 bool ValidateCandidate(const TypoCorrection &Candidate) override {
8158 NamedDecl *ND = Candidate.getCorrectionDecl();
8160 // Keywords are not valid here.
8161 if (!ND || isa<NamespaceDecl>(ND))
8164 // Completely unqualified names are invalid for a 'using' declaration.
8165 if (Candidate.WillReplaceSpecifier() && !Candidate.getCorrectionSpecifier())
8168 // FIXME: Don't correct to a name that CheckUsingDeclRedeclaration would
8171 if (RequireMemberOf) {
8172 auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND);
8173 if (FoundRecord && FoundRecord->isInjectedClassName()) {
8174 // No-one ever wants a using-declaration to name an injected-class-name
8175 // of a base class, unless they're declaring an inheriting constructor.
8176 ASTContext &Ctx = ND->getASTContext();
8177 if (!Ctx.getLangOpts().CPlusPlus11)
8179 QualType FoundType = Ctx.getRecordType(FoundRecord);
8181 // Check that the injected-class-name is named as a member of its own
8182 // type; we don't want to suggest 'using Derived::Base;', since that
8183 // means something else.
8184 NestedNameSpecifier *Specifier =
8185 Candidate.WillReplaceSpecifier()
8186 ? Candidate.getCorrectionSpecifier()
8188 if (!Specifier->getAsType() ||
8189 !Ctx.hasSameType(QualType(Specifier->getAsType(), 0), FoundType))
8192 // Check that this inheriting constructor declaration actually names a
8193 // direct base class of the current class.
8194 bool AnyDependentBases = false;
8195 if (!findDirectBaseWithType(RequireMemberOf,
8196 Ctx.getRecordType(FoundRecord),
8197 AnyDependentBases) &&
8201 auto *RD = dyn_cast<CXXRecordDecl>(ND->getDeclContext());
8202 if (!RD || RequireMemberOf->isProvablyNotDerivedFrom(RD))
8205 // FIXME: Check that the base class member is accessible?
8208 auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND);
8209 if (FoundRecord && FoundRecord->isInjectedClassName())
8213 if (isa<TypeDecl>(ND))
8214 return HasTypenameKeyword || !IsInstantiation;
8216 return !HasTypenameKeyword;
8220 bool HasTypenameKeyword;
8221 bool IsInstantiation;
8222 NestedNameSpecifier *OldNNS;
8223 CXXRecordDecl *RequireMemberOf;
8225 } // end anonymous namespace
8227 /// Builds a using declaration.
8229 /// \param IsInstantiation - Whether this call arises from an
8230 /// instantiation of an unresolved using declaration. We treat
8231 /// the lookup differently for these declarations.
8232 NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
8233 SourceLocation UsingLoc,
8235 DeclarationNameInfo NameInfo,
8236 AttributeList *AttrList,
8237 bool IsInstantiation,
8238 bool HasTypenameKeyword,
8239 SourceLocation TypenameLoc) {
8240 assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
8241 SourceLocation IdentLoc = NameInfo.getLoc();
8242 assert(IdentLoc.isValid() && "Invalid TargetName location.");
8244 // FIXME: We ignore attributes for now.
8247 Diag(IdentLoc, diag::err_using_requires_qualname);
8251 // For an inheriting constructor declaration, the name of the using
8252 // declaration is the name of a constructor in this class, not in the
8254 DeclarationNameInfo UsingName = NameInfo;
8255 if (UsingName.getName().getNameKind() == DeclarationName::CXXConstructorName)
8256 if (auto *RD = dyn_cast<CXXRecordDecl>(CurContext))
8257 UsingName.setName(Context.DeclarationNames.getCXXConstructorName(
8258 Context.getCanonicalType(Context.getRecordType(RD))));
8260 // Do the redeclaration lookup in the current scope.
8261 LookupResult Previous(*this, UsingName, LookupUsingDeclName,
8263 Previous.setHideTags(false);
8265 LookupName(Previous, S);
8267 // It is really dumb that we have to do this.
8268 LookupResult::Filter F = Previous.makeFilter();
8269 while (F.hasNext()) {
8270 NamedDecl *D = F.next();
8271 if (!isDeclInScope(D, CurContext, S))
8273 // If we found a local extern declaration that's not ordinarily visible,
8274 // and this declaration is being added to a non-block scope, ignore it.
8275 // We're only checking for scope conflicts here, not also for violations
8276 // of the linkage rules.
8277 else if (!CurContext->isFunctionOrMethod() && D->isLocalExternDecl() &&
8278 !(D->getIdentifierNamespace() & Decl::IDNS_Ordinary))
8283 assert(IsInstantiation && "no scope in non-instantiation");
8284 assert(CurContext->isRecord() && "scope not record in instantiation");
8285 LookupQualifiedName(Previous, CurContext);
8288 // Check for invalid redeclarations.
8289 if (CheckUsingDeclRedeclaration(UsingLoc, HasTypenameKeyword,
8290 SS, IdentLoc, Previous))
8293 // Check for bad qualifiers.
8294 if (CheckUsingDeclQualifier(UsingLoc, SS, NameInfo, IdentLoc))
8297 DeclContext *LookupContext = computeDeclContext(SS);
8299 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
8300 if (!LookupContext) {
8301 if (HasTypenameKeyword) {
8302 // FIXME: not all declaration name kinds are legal here
8303 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext,
8304 UsingLoc, TypenameLoc,
8306 IdentLoc, NameInfo.getName());
8308 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc,
8309 QualifierLoc, NameInfo);
8312 CurContext->addDecl(D);
8316 auto Build = [&](bool Invalid) {
8318 UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc,
8319 UsingName, HasTypenameKeyword);
8321 CurContext->addDecl(UD);
8322 UD->setInvalidDecl(Invalid);
8325 auto BuildInvalid = [&]{ return Build(true); };
8326 auto BuildValid = [&]{ return Build(false); };
8328 if (RequireCompleteDeclContext(SS, LookupContext))
8329 return BuildInvalid();
8331 // Look up the target name.
8332 LookupResult R(*this, NameInfo, LookupOrdinaryName);
8334 // Unlike most lookups, we don't always want to hide tag
8335 // declarations: tag names are visible through the using declaration
8336 // even if hidden by ordinary names, *except* in a dependent context
8337 // where it's important for the sanity of two-phase lookup.
8338 if (!IsInstantiation)
8339 R.setHideTags(false);
8341 // For the purposes of this lookup, we have a base object type
8342 // equal to that of the current context.
8343 if (CurContext->isRecord()) {
8344 R.setBaseObjectType(
8345 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)));
8348 LookupQualifiedName(R, LookupContext);
8350 // Try to correct typos if possible. If constructor name lookup finds no
8351 // results, that means the named class has no explicit constructors, and we
8352 // suppressed declaring implicit ones (probably because it's dependent or
8355 NameInfo.getName().getNameKind() != DeclarationName::CXXConstructorName) {
8356 if (TypoCorrection Corrected = CorrectTypo(
8357 R.getLookupNameInfo(), R.getLookupKind(), S, &SS,
8358 llvm::make_unique<UsingValidatorCCC>(
8359 HasTypenameKeyword, IsInstantiation, SS.getScopeRep(),
8360 dyn_cast<CXXRecordDecl>(CurContext)),
8361 CTK_ErrorRecovery)) {
8362 // We reject any correction for which ND would be NULL.
8363 NamedDecl *ND = Corrected.getCorrectionDecl();
8365 // We reject candidates where DroppedSpecifier == true, hence the
8366 // literal '0' below.
8367 diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest)
8368 << NameInfo.getName() << LookupContext << 0
8371 // If we corrected to an inheriting constructor, handle it as one.
8372 auto *RD = dyn_cast<CXXRecordDecl>(ND);
8373 if (RD && RD->isInjectedClassName()) {
8374 // The parent of the injected class name is the class itself.
8375 RD = cast<CXXRecordDecl>(RD->getParent());
8377 // Fix up the information we'll use to build the using declaration.
8378 if (Corrected.WillReplaceSpecifier()) {
8379 NestedNameSpecifierLocBuilder Builder;
8380 Builder.MakeTrivial(Context, Corrected.getCorrectionSpecifier(),
8381 QualifierLoc.getSourceRange());
8382 QualifierLoc = Builder.getWithLocInContext(Context);
8385 // In this case, the name we introduce is the name of a derived class
8387 auto *CurClass = cast<CXXRecordDecl>(CurContext);
8388 UsingName.setName(Context.DeclarationNames.getCXXConstructorName(
8389 Context.getCanonicalType(Context.getRecordType(CurClass))));
8390 UsingName.setNamedTypeInfo(nullptr);
8391 for (auto *Ctor : LookupConstructors(RD))
8395 // FIXME: Pick up all the declarations if we found an overloaded
8397 UsingName.setName(ND->getDeclName());
8401 Diag(IdentLoc, diag::err_no_member)
8402 << NameInfo.getName() << LookupContext << SS.getRange();
8403 return BuildInvalid();
8407 if (R.isAmbiguous())
8408 return BuildInvalid();
8410 if (HasTypenameKeyword) {
8411 // If we asked for a typename and got a non-type decl, error out.
8412 if (!R.getAsSingle<TypeDecl>()) {
8413 Diag(IdentLoc, diag::err_using_typename_non_type);
8414 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
8415 Diag((*I)->getUnderlyingDecl()->getLocation(),
8416 diag::note_using_decl_target);
8417 return BuildInvalid();
8420 // If we asked for a non-typename and we got a type, error out,
8421 // but only if this is an instantiation of an unresolved using
8422 // decl. Otherwise just silently find the type name.
8423 if (IsInstantiation && R.getAsSingle<TypeDecl>()) {
8424 Diag(IdentLoc, diag::err_using_dependent_value_is_type);
8425 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target);
8426 return BuildInvalid();
8430 // C++14 [namespace.udecl]p6:
8431 // A using-declaration shall not name a namespace.
8432 if (R.getAsSingle<NamespaceDecl>()) {
8433 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace)
8435 return BuildInvalid();
8438 // C++14 [namespace.udecl]p7:
8439 // A using-declaration shall not name a scoped enumerator.
8440 if (auto *ED = R.getAsSingle<EnumConstantDecl>()) {
8441 if (cast<EnumDecl>(ED->getDeclContext())->isScoped()) {
8442 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_scoped_enum)
8444 return BuildInvalid();
8448 UsingDecl *UD = BuildValid();
8450 // Some additional rules apply to inheriting constructors.
8451 if (UsingName.getName().getNameKind() ==
8452 DeclarationName::CXXConstructorName) {
8453 // Suppress access diagnostics; the access check is instead performed at the
8454 // point of use for an inheriting constructor.
8455 R.suppressDiagnostics();
8456 if (CheckInheritingConstructorUsingDecl(UD))
8460 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
8461 UsingShadowDecl *PrevDecl = nullptr;
8462 if (!CheckUsingShadowDecl(UD, *I, Previous, PrevDecl))
8463 BuildUsingShadowDecl(S, UD, *I, PrevDecl);
8469 /// Additional checks for a using declaration referring to a constructor name.
8470 bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) {
8471 assert(!UD->hasTypename() && "expecting a constructor name");
8473 const Type *SourceType = UD->getQualifier()->getAsType();
8474 assert(SourceType &&
8475 "Using decl naming constructor doesn't have type in scope spec.");
8476 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext);
8478 // Check whether the named type is a direct base class.
8479 bool AnyDependentBases = false;
8480 auto *Base = findDirectBaseWithType(TargetClass, QualType(SourceType, 0),
8482 if (!Base && !AnyDependentBases) {
8483 Diag(UD->getUsingLoc(),
8484 diag::err_using_decl_constructor_not_in_direct_base)
8485 << UD->getNameInfo().getSourceRange()
8486 << QualType(SourceType, 0) << TargetClass;
8487 UD->setInvalidDecl();
8492 Base->setInheritConstructors();
8497 /// Checks that the given using declaration is not an invalid
8498 /// redeclaration. Note that this is checking only for the using decl
8499 /// itself, not for any ill-formedness among the UsingShadowDecls.
8500 bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
8501 bool HasTypenameKeyword,
8502 const CXXScopeSpec &SS,
8503 SourceLocation NameLoc,
8504 const LookupResult &Prev) {
8505 // C++03 [namespace.udecl]p8:
8506 // C++0x [namespace.udecl]p10:
8507 // A using-declaration is a declaration and can therefore be used
8508 // repeatedly where (and only where) multiple declarations are
8511 // That's in non-member contexts.
8512 if (!CurContext->getRedeclContext()->isRecord())
8515 NestedNameSpecifier *Qual = SS.getScopeRep();
8517 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) {
8521 NestedNameSpecifier *DQual;
8522 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) {
8523 DTypename = UD->hasTypename();
8524 DQual = UD->getQualifier();
8525 } else if (UnresolvedUsingValueDecl *UD
8526 = dyn_cast<UnresolvedUsingValueDecl>(D)) {
8528 DQual = UD->getQualifier();
8529 } else if (UnresolvedUsingTypenameDecl *UD
8530 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
8532 DQual = UD->getQualifier();
8535 // using decls differ if one says 'typename' and the other doesn't.
8536 // FIXME: non-dependent using decls?
8537 if (HasTypenameKeyword != DTypename) continue;
8539 // using decls differ if they name different scopes (but note that
8540 // template instantiation can cause this check to trigger when it
8541 // didn't before instantiation).
8542 if (Context.getCanonicalNestedNameSpecifier(Qual) !=
8543 Context.getCanonicalNestedNameSpecifier(DQual))
8546 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange();
8547 Diag(D->getLocation(), diag::note_using_decl) << 1;
8555 /// Checks that the given nested-name qualifier used in a using decl
8556 /// in the current context is appropriately related to the current
8557 /// scope. If an error is found, diagnoses it and returns true.
8558 bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc,
8559 const CXXScopeSpec &SS,
8560 const DeclarationNameInfo &NameInfo,
8561 SourceLocation NameLoc) {
8562 DeclContext *NamedContext = computeDeclContext(SS);
8564 if (!CurContext->isRecord()) {
8565 // C++03 [namespace.udecl]p3:
8566 // C++0x [namespace.udecl]p8:
8567 // A using-declaration for a class member shall be a member-declaration.
8569 // If we weren't able to compute a valid scope, it must be a
8570 // dependent class scope.
8571 if (!NamedContext || NamedContext->getRedeclContext()->isRecord()) {
8572 auto *RD = NamedContext
8573 ? cast<CXXRecordDecl>(NamedContext->getRedeclContext())
8575 if (RD && RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), RD))
8578 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member)
8581 // If we have a complete, non-dependent source type, try to suggest a
8582 // way to get the same effect.
8586 // Find what this using-declaration was referring to.
8587 LookupResult R(*this, NameInfo, LookupOrdinaryName);
8588 R.setHideTags(false);
8589 R.suppressDiagnostics();
8590 LookupQualifiedName(R, RD);
8592 if (R.getAsSingle<TypeDecl>()) {
8593 if (getLangOpts().CPlusPlus11) {
8594 // Convert 'using X::Y;' to 'using Y = X::Y;'.
8595 Diag(SS.getBeginLoc(), diag::note_using_decl_class_member_workaround)
8596 << 0 // alias declaration
8597 << FixItHint::CreateInsertion(SS.getBeginLoc(),
8598 NameInfo.getName().getAsString() +
8601 // Convert 'using X::Y;' to 'typedef X::Y Y;'.
8602 SourceLocation InsertLoc =
8603 getLocForEndOfToken(NameInfo.getLocEnd());
8604 Diag(InsertLoc, diag::note_using_decl_class_member_workaround)
8605 << 1 // typedef declaration
8606 << FixItHint::CreateReplacement(UsingLoc, "typedef")
8607 << FixItHint::CreateInsertion(
8608 InsertLoc, " " + NameInfo.getName().getAsString());
8610 } else if (R.getAsSingle<VarDecl>()) {
8611 // Don't provide a fixit outside C++11 mode; we don't want to suggest
8612 // repeating the type of the static data member here.
8614 if (getLangOpts().CPlusPlus11) {
8615 // Convert 'using X::Y;' to 'auto &Y = X::Y;'.
8616 FixIt = FixItHint::CreateReplacement(
8617 UsingLoc, "auto &" + NameInfo.getName().getAsString() + " = ");
8620 Diag(UsingLoc, diag::note_using_decl_class_member_workaround)
8621 << 2 // reference declaration
8623 } else if (R.getAsSingle<EnumConstantDecl>()) {
8624 // Don't provide a fixit outside C++11 mode; we don't want to suggest
8625 // repeating the type of the enumeration here, and we can't do so if
8626 // the type is anonymous.
8628 if (getLangOpts().CPlusPlus11) {
8629 // Convert 'using X::Y;' to 'auto &Y = X::Y;'.
8630 FixIt = FixItHint::CreateReplacement(
8631 UsingLoc, "constexpr auto " + NameInfo.getName().getAsString() + " = ");
8634 Diag(UsingLoc, diag::note_using_decl_class_member_workaround)
8635 << (getLangOpts().CPlusPlus11 ? 4 : 3) // const[expr] variable
8641 // Otherwise, everything is known to be fine.
8645 // The current scope is a record.
8647 // If the named context is dependent, we can't decide much.
8648 if (!NamedContext) {
8649 // FIXME: in C++0x, we can diagnose if we can prove that the
8650 // nested-name-specifier does not refer to a base class, which is
8651 // still possible in some cases.
8653 // Otherwise we have to conservatively report that things might be
8658 if (!NamedContext->isRecord()) {
8659 // Ideally this would point at the last name in the specifier,
8660 // but we don't have that level of source info.
8661 Diag(SS.getRange().getBegin(),
8662 diag::err_using_decl_nested_name_specifier_is_not_class)
8663 << SS.getScopeRep() << SS.getRange();
8667 if (!NamedContext->isDependentContext() &&
8668 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext))
8671 if (getLangOpts().CPlusPlus11) {
8672 // C++11 [namespace.udecl]p3:
8673 // In a using-declaration used as a member-declaration, the
8674 // nested-name-specifier shall name a base class of the class
8677 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(
8678 cast<CXXRecordDecl>(NamedContext))) {
8679 if (CurContext == NamedContext) {
8681 diag::err_using_decl_nested_name_specifier_is_current_class)
8686 Diag(SS.getRange().getBegin(),
8687 diag::err_using_decl_nested_name_specifier_is_not_base_class)
8689 << cast<CXXRecordDecl>(CurContext)
8697 // C++03 [namespace.udecl]p4:
8698 // A using-declaration used as a member-declaration shall refer
8699 // to a member of a base class of the class being defined [etc.].
8701 // Salient point: SS doesn't have to name a base class as long as
8702 // lookup only finds members from base classes. Therefore we can
8703 // diagnose here only if we can prove that that can't happen,
8704 // i.e. if the class hierarchies provably don't intersect.
8706 // TODO: it would be nice if "definitely valid" results were cached
8707 // in the UsingDecl and UsingShadowDecl so that these checks didn't
8708 // need to be repeated.
8710 llvm::SmallPtrSet<const CXXRecordDecl *, 4> Bases;
8711 auto Collect = [&Bases](const CXXRecordDecl *Base) {
8716 // Collect all bases. Return false if we find a dependent base.
8717 if (!cast<CXXRecordDecl>(CurContext)->forallBases(Collect))
8720 // Returns true if the base is dependent or is one of the accumulated base
8722 auto IsNotBase = [&Bases](const CXXRecordDecl *Base) {
8723 return !Bases.count(Base);
8726 // Return false if the class has a dependent base or if it or one
8727 // of its bases is present in the base set of the current context.
8728 if (Bases.count(cast<CXXRecordDecl>(NamedContext)) ||
8729 !cast<CXXRecordDecl>(NamedContext)->forallBases(IsNotBase))
8732 Diag(SS.getRange().getBegin(),
8733 diag::err_using_decl_nested_name_specifier_is_not_base_class)
8735 << cast<CXXRecordDecl>(CurContext)
8741 Decl *Sema::ActOnAliasDeclaration(Scope *S,
8743 MultiTemplateParamsArg TemplateParamLists,
8744 SourceLocation UsingLoc,
8745 UnqualifiedId &Name,
8746 AttributeList *AttrList,
8748 Decl *DeclFromDeclSpec) {
8749 // Skip up to the relevant declaration scope.
8750 while (S->isTemplateParamScope())
8752 assert((S->getFlags() & Scope::DeclScope) &&
8753 "got alias-declaration outside of declaration scope");
8755 if (Type.isInvalid())
8758 bool Invalid = false;
8759 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name);
8760 TypeSourceInfo *TInfo = nullptr;
8761 GetTypeFromParser(Type.get(), &TInfo);
8763 if (DiagnoseClassNameShadow(CurContext, NameInfo))
8766 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo,
8767 UPPC_DeclarationType)) {
8769 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
8770 TInfo->getTypeLoc().getBeginLoc());
8773 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration);
8774 LookupName(Previous, S);
8776 // Warn about shadowing the name of a template parameter.
8777 if (Previous.isSingleResult() &&
8778 Previous.getFoundDecl()->isTemplateParameter()) {
8779 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl());
8783 assert(Name.Kind == UnqualifiedId::IK_Identifier &&
8784 "name in alias declaration must be an identifier");
8785 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc,
8787 Name.Identifier, TInfo);
8789 NewTD->setAccess(AS);
8792 NewTD->setInvalidDecl();
8794 ProcessDeclAttributeList(S, NewTD, AttrList);
8796 CheckTypedefForVariablyModifiedType(S, NewTD);
8797 Invalid |= NewTD->isInvalidDecl();
8799 bool Redeclaration = false;
8802 if (TemplateParamLists.size()) {
8803 TypeAliasTemplateDecl *OldDecl = nullptr;
8804 TemplateParameterList *OldTemplateParams = nullptr;
8806 if (TemplateParamLists.size() != 1) {
8807 Diag(UsingLoc, diag::err_alias_template_extra_headers)
8808 << SourceRange(TemplateParamLists[1]->getTemplateLoc(),
8809 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc());
8811 TemplateParameterList *TemplateParams = TemplateParamLists[0];
8813 // Check that we can declare a template here.
8814 if (CheckTemplateDeclScope(S, TemplateParams))
8817 // Only consider previous declarations in the same scope.
8818 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false,
8819 /*ExplicitInstantiationOrSpecialization*/false);
8820 if (!Previous.empty()) {
8821 Redeclaration = true;
8823 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>();
8824 if (!OldDecl && !Invalid) {
8825 Diag(UsingLoc, diag::err_redefinition_different_kind)
8828 NamedDecl *OldD = Previous.getRepresentativeDecl();
8829 if (OldD->getLocation().isValid())
8830 Diag(OldD->getLocation(), diag::note_previous_definition);
8835 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) {
8836 if (TemplateParameterListsAreEqual(TemplateParams,
8837 OldDecl->getTemplateParameters(),
8840 OldTemplateParams = OldDecl->getTemplateParameters();
8844 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl();
8846 !Context.hasSameType(OldTD->getUnderlyingType(),
8847 NewTD->getUnderlyingType())) {
8848 // FIXME: The C++0x standard does not clearly say this is ill-formed,
8849 // but we can't reasonably accept it.
8850 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef)
8851 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType();
8852 if (OldTD->getLocation().isValid())
8853 Diag(OldTD->getLocation(), diag::note_previous_definition);
8859 // Merge any previous default template arguments into our parameters,
8860 // and check the parameter list.
8861 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams,
8862 TPC_TypeAliasTemplate))
8865 TypeAliasTemplateDecl *NewDecl =
8866 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc,
8867 Name.Identifier, TemplateParams,
8869 NewTD->setDescribedAliasTemplate(NewDecl);
8871 NewDecl->setAccess(AS);
8874 NewDecl->setInvalidDecl();
8876 NewDecl->setPreviousDecl(OldDecl);
8880 if (auto *TD = dyn_cast_or_null<TagDecl>(DeclFromDeclSpec)) {
8881 setTagNameForLinkagePurposes(TD, NewTD);
8882 handleTagNumbering(TD, S);
8884 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration);
8888 PushOnScopeChains(NewND, S);
8889 ActOnDocumentableDecl(NewND);
8893 Decl *Sema::ActOnNamespaceAliasDef(Scope *S, SourceLocation NamespaceLoc,
8894 SourceLocation AliasLoc,
8895 IdentifierInfo *Alias, CXXScopeSpec &SS,
8896 SourceLocation IdentLoc,
8897 IdentifierInfo *Ident) {
8899 // Lookup the namespace name.
8900 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName);
8901 LookupParsedName(R, S, &SS);
8903 if (R.isAmbiguous())
8907 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) {
8908 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
8912 assert(!R.isAmbiguous() && !R.empty());
8913 NamedDecl *ND = R.getRepresentativeDecl();
8915 // Check if we have a previous declaration with the same name.
8916 LookupResult PrevR(*this, Alias, AliasLoc, LookupOrdinaryName,
8918 LookupName(PrevR, S);
8920 // Check we're not shadowing a template parameter.
8921 if (PrevR.isSingleResult() && PrevR.getFoundDecl()->isTemplateParameter()) {
8922 DiagnoseTemplateParameterShadow(AliasLoc, PrevR.getFoundDecl());
8926 // Filter out any other lookup result from an enclosing scope.
8927 FilterLookupForScope(PrevR, CurContext, S, /*ConsiderLinkage*/false,
8928 /*AllowInlineNamespace*/false);
8930 // Find the previous declaration and check that we can redeclare it.
8931 NamespaceAliasDecl *Prev = nullptr;
8932 if (PrevR.isSingleResult()) {
8933 NamedDecl *PrevDecl = PrevR.getRepresentativeDecl();
8934 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) {
8935 // We already have an alias with the same name that points to the same
8936 // namespace; check that it matches.
8937 if (AD->getNamespace()->Equals(getNamespaceDecl(ND))) {
8939 } else if (isVisible(PrevDecl)) {
8940 Diag(AliasLoc, diag::err_redefinition_different_namespace_alias)
8942 Diag(AD->getLocation(), diag::note_previous_namespace_alias)
8943 << AD->getNamespace();
8946 } else if (isVisible(PrevDecl)) {
8947 unsigned DiagID = isa<NamespaceDecl>(PrevDecl->getUnderlyingDecl())
8948 ? diag::err_redefinition
8949 : diag::err_redefinition_different_kind;
8950 Diag(AliasLoc, DiagID) << Alias;
8951 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
8956 // The use of a nested name specifier may trigger deprecation warnings.
8957 DiagnoseUseOfDecl(ND, IdentLoc);
8959 NamespaceAliasDecl *AliasDecl =
8960 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc,
8961 Alias, SS.getWithLocInContext(Context),
8964 AliasDecl->setPreviousDecl(Prev);
8966 PushOnScopeChains(AliasDecl, S);
8970 Sema::ImplicitExceptionSpecification
8971 Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc,
8972 CXXMethodDecl *MD) {
8973 CXXRecordDecl *ClassDecl = MD->getParent();
8975 // C++ [except.spec]p14:
8976 // An implicitly declared special member function (Clause 12) shall have an
8977 // exception-specification. [...]
8978 ImplicitExceptionSpecification ExceptSpec(*this);
8979 if (ClassDecl->isInvalidDecl())
8982 // Direct base-class constructors.
8983 for (const auto &B : ClassDecl->bases()) {
8984 if (B.isVirtual()) // Handled below.
8987 if (const RecordType *BaseType = B.getType()->getAs<RecordType>()) {
8988 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
8989 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
8990 // If this is a deleted function, add it anyway. This might be conformant
8991 // with the standard. This might not. I'm not sure. It might not matter.
8993 ExceptSpec.CalledDecl(B.getLocStart(), Constructor);
8997 // Virtual base-class constructors.
8998 for (const auto &B : ClassDecl->vbases()) {
8999 if (const RecordType *BaseType = B.getType()->getAs<RecordType>()) {
9000 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
9001 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl);
9002 // If this is a deleted function, add it anyway. This might be conformant
9003 // with the standard. This might not. I'm not sure. It might not matter.
9005 ExceptSpec.CalledDecl(B.getLocStart(), Constructor);
9009 // Field constructors.
9010 for (const auto *F : ClassDecl->fields()) {
9011 if (F->hasInClassInitializer()) {
9012 if (Expr *E = F->getInClassInitializer())
9013 ExceptSpec.CalledExpr(E);
9014 } else if (const RecordType *RecordTy
9015 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) {
9016 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
9017 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl);
9018 // If this is a deleted function, add it anyway. This might be conformant
9019 // with the standard. This might not. I'm not sure. It might not matter.
9020 // In particular, the problem is that this function never gets called. It
9021 // might just be ill-formed because this function attempts to refer to
9022 // a deleted function here.
9024 ExceptSpec.CalledDecl(F->getLocation(), Constructor);
9031 Sema::ImplicitExceptionSpecification
9032 Sema::ComputeInheritingCtorExceptionSpec(SourceLocation Loc,
9033 CXXConstructorDecl *CD) {
9034 CXXRecordDecl *ClassDecl = CD->getParent();
9036 // C++ [except.spec]p14:
9037 // An inheriting constructor [...] shall have an exception-specification. [...]
9038 ImplicitExceptionSpecification ExceptSpec(*this);
9039 if (ClassDecl->isInvalidDecl())
9042 auto Inherited = CD->getInheritedConstructor();
9043 InheritedConstructorInfo ICI(*this, Loc, Inherited.getShadowDecl());
9045 // Direct and virtual base-class constructors.
9046 for (bool VBase : {false, true}) {
9047 for (CXXBaseSpecifier &B :
9048 VBase ? ClassDecl->vbases() : ClassDecl->bases()) {
9049 // Don't visit direct vbases twice.
9050 if (B.isVirtual() != VBase)
9053 CXXRecordDecl *BaseClass = B.getType()->getAsCXXRecordDecl();
9057 CXXConstructorDecl *Constructor =
9058 ICI.findConstructorForBase(BaseClass, Inherited.getConstructor())
9061 Constructor = LookupDefaultConstructor(BaseClass);
9063 ExceptSpec.CalledDecl(B.getLocStart(), Constructor);
9067 // Field constructors.
9068 for (const auto *F : ClassDecl->fields()) {
9069 if (F->hasInClassInitializer()) {
9070 if (Expr *E = F->getInClassInitializer())
9071 ExceptSpec.CalledExpr(E);
9072 } else if (const RecordType *RecordTy
9073 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) {
9074 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
9075 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl);
9077 ExceptSpec.CalledDecl(F->getLocation(), Constructor);
9085 /// RAII object to register a special member as being currently declared.
9086 struct DeclaringSpecialMember {
9088 Sema::SpecialMemberDecl D;
9089 Sema::ContextRAII SavedContext;
9090 bool WasAlreadyBeingDeclared;
9092 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM)
9093 : S(S), D(RD, CSM), SavedContext(S, RD) {
9094 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D).second;
9095 if (WasAlreadyBeingDeclared)
9096 // This almost never happens, but if it does, ensure that our cache
9097 // doesn't contain a stale result.
9098 S.SpecialMemberCache.clear();
9100 // FIXME: Register a note to be produced if we encounter an error while
9101 // declaring the special member.
9103 ~DeclaringSpecialMember() {
9104 if (!WasAlreadyBeingDeclared)
9105 S.SpecialMembersBeingDeclared.erase(D);
9108 /// \brief Are we already trying to declare this special member?
9109 bool isAlreadyBeingDeclared() const {
9110 return WasAlreadyBeingDeclared;
9115 void Sema::CheckImplicitSpecialMemberDeclaration(Scope *S, FunctionDecl *FD) {
9116 // Look up any existing declarations, but don't trigger declaration of all
9117 // implicit special members with this name.
9118 DeclarationName Name = FD->getDeclName();
9119 LookupResult R(*this, Name, SourceLocation(), LookupOrdinaryName,
9121 for (auto *D : FD->getParent()->lookup(Name))
9122 if (auto *Acceptable = R.getAcceptableDecl(D))
9123 R.addDecl(Acceptable);
9125 R.suppressDiagnostics();
9127 CheckFunctionDeclaration(S, FD, R, /*IsExplicitSpecialization*/false);
9130 CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor(
9131 CXXRecordDecl *ClassDecl) {
9132 // C++ [class.ctor]p5:
9133 // A default constructor for a class X is a constructor of class X
9134 // that can be called without an argument. If there is no
9135 // user-declared constructor for class X, a default constructor is
9136 // implicitly declared. An implicitly-declared default constructor
9137 // is an inline public member of its class.
9138 assert(ClassDecl->needsImplicitDefaultConstructor() &&
9139 "Should not build implicit default constructor!");
9141 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor);
9142 if (DSM.isAlreadyBeingDeclared())
9145 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
9146 CXXDefaultConstructor,
9149 // Create the actual constructor declaration.
9150 CanQualType ClassType
9151 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
9152 SourceLocation ClassLoc = ClassDecl->getLocation();
9153 DeclarationName Name
9154 = Context.DeclarationNames.getCXXConstructorName(ClassType);
9155 DeclarationNameInfo NameInfo(Name, ClassLoc);
9156 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create(
9157 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(),
9158 /*TInfo=*/nullptr, /*isExplicit=*/false, /*isInline=*/true,
9159 /*isImplicitlyDeclared=*/true, Constexpr);
9160 DefaultCon->setAccess(AS_public);
9161 DefaultCon->setDefaulted();
9163 if (getLangOpts().CUDA) {
9164 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDefaultConstructor,
9166 /* ConstRHS */ false,
9167 /* Diagnose */ false);
9170 // Build an exception specification pointing back at this constructor.
9171 FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, DefaultCon);
9172 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, None, EPI));
9174 // We don't need to use SpecialMemberIsTrivial here; triviality for default
9175 // constructors is easy to compute.
9176 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor());
9178 // Note that we have declared this constructor.
9179 ++ASTContext::NumImplicitDefaultConstructorsDeclared;
9181 Scope *S = getScopeForContext(ClassDecl);
9182 CheckImplicitSpecialMemberDeclaration(S, DefaultCon);
9184 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor))
9185 SetDeclDeleted(DefaultCon, ClassLoc);
9188 PushOnScopeChains(DefaultCon, S, false);
9189 ClassDecl->addDecl(DefaultCon);
9194 void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
9195 CXXConstructorDecl *Constructor) {
9196 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&
9197 !Constructor->doesThisDeclarationHaveABody() &&
9198 !Constructor->isDeleted()) &&
9199 "DefineImplicitDefaultConstructor - call it for implicit default ctor");
9201 CXXRecordDecl *ClassDecl = Constructor->getParent();
9202 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor");
9204 SynthesizedFunctionScope Scope(*this, Constructor);
9205 DiagnosticErrorTrap Trap(Diags);
9206 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) ||
9207 Trap.hasErrorOccurred()) {
9208 Diag(CurrentLocation, diag::note_member_synthesized_at)
9209 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl);
9210 Constructor->setInvalidDecl();
9214 // The exception specification is needed because we are defining the
9216 ResolveExceptionSpec(CurrentLocation,
9217 Constructor->getType()->castAs<FunctionProtoType>());
9219 SourceLocation Loc = Constructor->getLocEnd().isValid()
9220 ? Constructor->getLocEnd()
9221 : Constructor->getLocation();
9222 Constructor->setBody(new (Context) CompoundStmt(Loc));
9224 Constructor->markUsed(Context);
9225 MarkVTableUsed(CurrentLocation, ClassDecl);
9227 if (ASTMutationListener *L = getASTMutationListener()) {
9228 L->CompletedImplicitDefinition(Constructor);
9231 DiagnoseUninitializedFields(*this, Constructor);
9234 void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) {
9235 // Perform any delayed checks on exception specifications.
9236 CheckDelayedMemberExceptionSpecs();
9239 /// Find or create the fake constructor we synthesize to model constructing an
9240 /// object of a derived class via a constructor of a base class.
9241 CXXConstructorDecl *
9242 Sema::findInheritingConstructor(SourceLocation Loc,
9243 CXXConstructorDecl *BaseCtor,
9244 ConstructorUsingShadowDecl *Shadow) {
9245 CXXRecordDecl *Derived = Shadow->getParent();
9246 SourceLocation UsingLoc = Shadow->getLocation();
9248 // FIXME: Add a new kind of DeclarationName for an inherited constructor.
9249 // For now we use the name of the base class constructor as a member of the
9250 // derived class to indicate a (fake) inherited constructor name.
9251 DeclarationName Name = BaseCtor->getDeclName();
9253 // Check to see if we already have a fake constructor for this inherited
9254 // constructor call.
9255 for (NamedDecl *Ctor : Derived->lookup(Name))
9256 if (declaresSameEntity(cast<CXXConstructorDecl>(Ctor)
9257 ->getInheritedConstructor()
9260 return cast<CXXConstructorDecl>(Ctor);
9262 DeclarationNameInfo NameInfo(Name, UsingLoc);
9263 TypeSourceInfo *TInfo =
9264 Context.getTrivialTypeSourceInfo(BaseCtor->getType(), UsingLoc);
9265 FunctionProtoTypeLoc ProtoLoc =
9266 TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>();
9268 // Check the inherited constructor is valid and find the list of base classes
9269 // from which it was inherited.
9270 InheritedConstructorInfo ICI(*this, Loc, Shadow);
9273 BaseCtor->isConstexpr() &&
9274 defaultedSpecialMemberIsConstexpr(*this, Derived, CXXDefaultConstructor,
9275 false, BaseCtor, &ICI);
9277 CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create(
9278 Context, Derived, UsingLoc, NameInfo, TInfo->getType(), TInfo,
9279 BaseCtor->isExplicit(), /*Inline=*/true,
9280 /*ImplicitlyDeclared=*/true, Constexpr,
9281 InheritedConstructor(Shadow, BaseCtor));
9282 if (Shadow->isInvalidDecl())
9283 DerivedCtor->setInvalidDecl();
9285 // Build an unevaluated exception specification for this fake constructor.
9286 const FunctionProtoType *FPT = TInfo->getType()->castAs<FunctionProtoType>();
9287 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
9288 EPI.ExceptionSpec.Type = EST_Unevaluated;
9289 EPI.ExceptionSpec.SourceDecl = DerivedCtor;
9290 DerivedCtor->setType(Context.getFunctionType(FPT->getReturnType(),
9291 FPT->getParamTypes(), EPI));
9293 // Build the parameter declarations.
9294 SmallVector<ParmVarDecl *, 16> ParamDecls;
9295 for (unsigned I = 0, N = FPT->getNumParams(); I != N; ++I) {
9296 TypeSourceInfo *TInfo =
9297 Context.getTrivialTypeSourceInfo(FPT->getParamType(I), UsingLoc);
9298 ParmVarDecl *PD = ParmVarDecl::Create(
9299 Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/nullptr,
9300 FPT->getParamType(I), TInfo, SC_None, /*DefaultArg=*/nullptr);
9301 PD->setScopeInfo(0, I);
9303 // Ensure attributes are propagated onto parameters (this matters for
9304 // format, pass_object_size, ...).
9305 mergeDeclAttributes(PD, BaseCtor->getParamDecl(I));
9306 ParamDecls.push_back(PD);
9307 ProtoLoc.setParam(I, PD);
9310 // Set up the new constructor.
9311 assert(!BaseCtor->isDeleted() && "should not use deleted constructor");
9312 DerivedCtor->setAccess(BaseCtor->getAccess());
9313 DerivedCtor->setParams(ParamDecls);
9314 Derived->addDecl(DerivedCtor);
9316 if (ShouldDeleteSpecialMember(DerivedCtor, CXXDefaultConstructor, &ICI))
9317 SetDeclDeleted(DerivedCtor, UsingLoc);
9322 void Sema::NoteDeletedInheritingConstructor(CXXConstructorDecl *Ctor) {
9323 InheritedConstructorInfo ICI(*this, Ctor->getLocation(),
9324 Ctor->getInheritedConstructor().getShadowDecl());
9325 ShouldDeleteSpecialMember(Ctor, CXXDefaultConstructor, &ICI,
9329 void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation,
9330 CXXConstructorDecl *Constructor) {
9331 CXXRecordDecl *ClassDecl = Constructor->getParent();
9332 assert(Constructor->getInheritedConstructor() &&
9333 !Constructor->doesThisDeclarationHaveABody() &&
9334 !Constructor->isDeleted());
9335 if (Constructor->isInvalidDecl())
9338 ConstructorUsingShadowDecl *Shadow =
9339 Constructor->getInheritedConstructor().getShadowDecl();
9340 CXXConstructorDecl *InheritedCtor =
9341 Constructor->getInheritedConstructor().getConstructor();
9343 // [class.inhctor.init]p1:
9344 // initialization proceeds as if a defaulted default constructor is used to
9345 // initialize the D object and each base class subobject from which the
9346 // constructor was inherited
9348 InheritedConstructorInfo ICI(*this, CurrentLocation, Shadow);
9349 CXXRecordDecl *RD = Shadow->getParent();
9350 SourceLocation InitLoc = Shadow->getLocation();
9352 // Initializations are performed "as if by a defaulted default constructor",
9353 // so enter the appropriate scope.
9354 SynthesizedFunctionScope Scope(*this, Constructor);
9355 DiagnosticErrorTrap Trap(Diags);
9357 // Build explicit initializers for all base classes from which the
9358 // constructor was inherited.
9359 SmallVector<CXXCtorInitializer*, 8> Inits;
9360 for (bool VBase : {false, true}) {
9361 for (CXXBaseSpecifier &B : VBase ? RD->vbases() : RD->bases()) {
9362 if (B.isVirtual() != VBase)
9365 auto *BaseRD = B.getType()->getAsCXXRecordDecl();
9369 auto BaseCtor = ICI.findConstructorForBase(BaseRD, InheritedCtor);
9370 if (!BaseCtor.first)
9373 MarkFunctionReferenced(CurrentLocation, BaseCtor.first);
9374 ExprResult Init = new (Context) CXXInheritedCtorInitExpr(
9375 InitLoc, B.getType(), BaseCtor.first, VBase, BaseCtor.second);
9377 auto *TInfo = Context.getTrivialTypeSourceInfo(B.getType(), InitLoc);
9378 Inits.push_back(new (Context) CXXCtorInitializer(
9379 Context, TInfo, VBase, InitLoc, Init.get(), InitLoc,
9384 // We now proceed as if for a defaulted default constructor, with the relevant
9385 // initializers replaced.
9387 bool HadError = SetCtorInitializers(Constructor, /*AnyErrors*/false, Inits);
9388 if (HadError || Trap.hasErrorOccurred()) {
9389 Diag(CurrentLocation, diag::note_inhctor_synthesized_at) << RD;
9390 Constructor->setInvalidDecl();
9394 // The exception specification is needed because we are defining the
9396 ResolveExceptionSpec(CurrentLocation,
9397 Constructor->getType()->castAs<FunctionProtoType>());
9399 Constructor->setBody(new (Context) CompoundStmt(InitLoc));
9401 Constructor->markUsed(Context);
9402 MarkVTableUsed(CurrentLocation, ClassDecl);
9404 if (ASTMutationListener *L = getASTMutationListener()) {
9405 L->CompletedImplicitDefinition(Constructor);
9408 DiagnoseUninitializedFields(*this, Constructor);
9411 Sema::ImplicitExceptionSpecification
9412 Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) {
9413 CXXRecordDecl *ClassDecl = MD->getParent();
9415 // C++ [except.spec]p14:
9416 // An implicitly declared special member function (Clause 12) shall have
9417 // an exception-specification.
9418 ImplicitExceptionSpecification ExceptSpec(*this);
9419 if (ClassDecl->isInvalidDecl())
9422 // Direct base-class destructors.
9423 for (const auto &B : ClassDecl->bases()) {
9424 if (B.isVirtual()) // Handled below.
9427 if (const RecordType *BaseType = B.getType()->getAs<RecordType>())
9428 ExceptSpec.CalledDecl(B.getLocStart(),
9429 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl())));
9432 // Virtual base-class destructors.
9433 for (const auto &B : ClassDecl->vbases()) {
9434 if (const RecordType *BaseType = B.getType()->getAs<RecordType>())
9435 ExceptSpec.CalledDecl(B.getLocStart(),
9436 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl())));
9439 // Field destructors.
9440 for (const auto *F : ClassDecl->fields()) {
9441 if (const RecordType *RecordTy
9442 = Context.getBaseElementType(F->getType())->getAs<RecordType>())
9443 ExceptSpec.CalledDecl(F->getLocation(),
9444 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl())));
9450 CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) {
9451 // C++ [class.dtor]p2:
9452 // If a class has no user-declared destructor, a destructor is
9453 // declared implicitly. An implicitly-declared destructor is an
9454 // inline public member of its class.
9455 assert(ClassDecl->needsImplicitDestructor());
9457 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor);
9458 if (DSM.isAlreadyBeingDeclared())
9461 // Create the actual destructor declaration.
9462 CanQualType ClassType
9463 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
9464 SourceLocation ClassLoc = ClassDecl->getLocation();
9465 DeclarationName Name
9466 = Context.DeclarationNames.getCXXDestructorName(ClassType);
9467 DeclarationNameInfo NameInfo(Name, ClassLoc);
9468 CXXDestructorDecl *Destructor
9469 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo,
9470 QualType(), nullptr, /*isInline=*/true,
9471 /*isImplicitlyDeclared=*/true);
9472 Destructor->setAccess(AS_public);
9473 Destructor->setDefaulted();
9475 if (getLangOpts().CUDA) {
9476 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDestructor,
9478 /* ConstRHS */ false,
9479 /* Diagnose */ false);
9482 // Build an exception specification pointing back at this destructor.
9483 FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, Destructor);
9484 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI));
9486 // We don't need to use SpecialMemberIsTrivial here; triviality for
9487 // destructors is easy to compute.
9488 Destructor->setTrivial(ClassDecl->hasTrivialDestructor());
9490 // Note that we have declared this destructor.
9491 ++ASTContext::NumImplicitDestructorsDeclared;
9493 Scope *S = getScopeForContext(ClassDecl);
9494 CheckImplicitSpecialMemberDeclaration(S, Destructor);
9496 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor))
9497 SetDeclDeleted(Destructor, ClassLoc);
9499 // Introduce this destructor into its scope.
9501 PushOnScopeChains(Destructor, S, false);
9502 ClassDecl->addDecl(Destructor);
9507 void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation,
9508 CXXDestructorDecl *Destructor) {
9509 assert((Destructor->isDefaulted() &&
9510 !Destructor->doesThisDeclarationHaveABody() &&
9511 !Destructor->isDeleted()) &&
9512 "DefineImplicitDestructor - call it for implicit default dtor");
9513 CXXRecordDecl *ClassDecl = Destructor->getParent();
9514 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor");
9516 if (Destructor->isInvalidDecl())
9519 SynthesizedFunctionScope Scope(*this, Destructor);
9521 DiagnosticErrorTrap Trap(Diags);
9522 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
9523 Destructor->getParent());
9525 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) {
9526 Diag(CurrentLocation, diag::note_member_synthesized_at)
9527 << CXXDestructor << Context.getTagDeclType(ClassDecl);
9529 Destructor->setInvalidDecl();
9533 // The exception specification is needed because we are defining the
9535 ResolveExceptionSpec(CurrentLocation,
9536 Destructor->getType()->castAs<FunctionProtoType>());
9538 SourceLocation Loc = Destructor->getLocEnd().isValid()
9539 ? Destructor->getLocEnd()
9540 : Destructor->getLocation();
9541 Destructor->setBody(new (Context) CompoundStmt(Loc));
9542 Destructor->markUsed(Context);
9543 MarkVTableUsed(CurrentLocation, ClassDecl);
9545 if (ASTMutationListener *L = getASTMutationListener()) {
9546 L->CompletedImplicitDefinition(Destructor);
9550 /// \brief Perform any semantic analysis which needs to be delayed until all
9551 /// pending class member declarations have been parsed.
9552 void Sema::ActOnFinishCXXMemberDecls() {
9553 // If the context is an invalid C++ class, just suppress these checks.
9554 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) {
9555 if (Record->isInvalidDecl()) {
9556 DelayedDefaultedMemberExceptionSpecs.clear();
9557 DelayedExceptionSpecChecks.clear();
9563 static void getDefaultArgExprsForConstructors(Sema &S, CXXRecordDecl *Class) {
9564 // Don't do anything for template patterns.
9565 if (Class->getDescribedClassTemplate())
9568 CallingConv ExpectedCallingConv = S.Context.getDefaultCallingConvention(
9569 /*IsVariadic=*/false, /*IsCXXMethod=*/true);
9571 CXXConstructorDecl *LastExportedDefaultCtor = nullptr;
9572 for (Decl *Member : Class->decls()) {
9573 auto *CD = dyn_cast<CXXConstructorDecl>(Member);
9575 // Recurse on nested classes.
9576 if (auto *NestedRD = dyn_cast<CXXRecordDecl>(Member))
9577 getDefaultArgExprsForConstructors(S, NestedRD);
9579 } else if (!CD->isDefaultConstructor() || !CD->hasAttr<DLLExportAttr>()) {
9583 CallingConv ActualCallingConv =
9584 CD->getType()->getAs<FunctionProtoType>()->getCallConv();
9586 // Skip default constructors with typical calling conventions and no default
9588 unsigned NumParams = CD->getNumParams();
9589 if (ExpectedCallingConv == ActualCallingConv && NumParams == 0)
9592 if (LastExportedDefaultCtor) {
9593 S.Diag(LastExportedDefaultCtor->getLocation(),
9594 diag::err_attribute_dll_ambiguous_default_ctor) << Class;
9595 S.Diag(CD->getLocation(), diag::note_entity_declared_at)
9596 << CD->getDeclName();
9599 LastExportedDefaultCtor = CD;
9601 for (unsigned I = 0; I != NumParams; ++I) {
9602 // Skip any default arguments that we've already instantiated.
9603 if (S.Context.getDefaultArgExprForConstructor(CD, I))
9606 Expr *DefaultArg = S.BuildCXXDefaultArgExpr(Class->getLocation(), CD,
9607 CD->getParamDecl(I)).get();
9608 S.DiscardCleanupsInEvaluationContext();
9609 S.Context.addDefaultArgExprForConstructor(CD, I, DefaultArg);
9614 void Sema::ActOnFinishCXXNonNestedClass(Decl *D) {
9615 auto *RD = dyn_cast<CXXRecordDecl>(D);
9617 // Default constructors that are annotated with __declspec(dllexport) which
9618 // have default arguments or don't use the standard calling convention are
9619 // wrapped with a thunk called the default constructor closure.
9620 if (RD && Context.getTargetInfo().getCXXABI().isMicrosoft())
9621 getDefaultArgExprsForConstructors(*this, RD);
9623 referenceDLLExportedClassMethods();
9626 void Sema::referenceDLLExportedClassMethods() {
9627 if (!DelayedDllExportClasses.empty()) {
9628 // Calling ReferenceDllExportedMethods might cause the current function to
9629 // be called again, so use a local copy of DelayedDllExportClasses.
9630 SmallVector<CXXRecordDecl *, 4> WorkList;
9631 std::swap(DelayedDllExportClasses, WorkList);
9632 for (CXXRecordDecl *Class : WorkList)
9633 ReferenceDllExportedMethods(*this, Class);
9637 void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl,
9638 CXXDestructorDecl *Destructor) {
9639 assert(getLangOpts().CPlusPlus11 &&
9640 "adjusting dtor exception specs was introduced in c++11");
9642 // C++11 [class.dtor]p3:
9643 // A declaration of a destructor that does not have an exception-
9644 // specification is implicitly considered to have the same exception-
9645 // specification as an implicit declaration.
9646 const FunctionProtoType *DtorType = Destructor->getType()->
9647 getAs<FunctionProtoType>();
9648 if (DtorType->hasExceptionSpec())
9651 // Replace the destructor's type, building off the existing one. Fortunately,
9652 // the only thing of interest in the destructor type is its extended info.
9653 // The return and arguments are fixed.
9654 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo();
9655 EPI.ExceptionSpec.Type = EST_Unevaluated;
9656 EPI.ExceptionSpec.SourceDecl = Destructor;
9657 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI));
9659 // FIXME: If the destructor has a body that could throw, and the newly created
9660 // spec doesn't allow exceptions, we should emit a warning, because this
9661 // change in behavior can break conforming C++03 programs at runtime.
9662 // However, we don't have a body or an exception specification yet, so it
9663 // needs to be done somewhere else.
9667 /// \brief An abstract base class for all helper classes used in building the
9668 // copy/move operators. These classes serve as factory functions and help us
9669 // avoid using the same Expr* in the AST twice.
9671 ExprBuilder(const ExprBuilder&) = delete;
9672 ExprBuilder &operator=(const ExprBuilder&) = delete;
9675 static Expr *assertNotNull(Expr *E) {
9676 assert(E && "Expression construction must not fail.");
9682 virtual ~ExprBuilder() {}
9684 virtual Expr *build(Sema &S, SourceLocation Loc) const = 0;
9687 class RefBuilder: public ExprBuilder {
9692 Expr *build(Sema &S, SourceLocation Loc) const override {
9693 return assertNotNull(S.BuildDeclRefExpr(Var, VarType, VK_LValue, Loc).get());
9696 RefBuilder(VarDecl *Var, QualType VarType)
9697 : Var(Var), VarType(VarType) {}
9700 class ThisBuilder: public ExprBuilder {
9702 Expr *build(Sema &S, SourceLocation Loc) const override {
9703 return assertNotNull(S.ActOnCXXThis(Loc).getAs<Expr>());
9707 class CastBuilder: public ExprBuilder {
9708 const ExprBuilder &Builder;
9711 const CXXCastPath &Path;
9714 Expr *build(Sema &S, SourceLocation Loc) const override {
9715 return assertNotNull(S.ImpCastExprToType(Builder.build(S, Loc), Type,
9716 CK_UncheckedDerivedToBase, Kind,
9720 CastBuilder(const ExprBuilder &Builder, QualType Type, ExprValueKind Kind,
9721 const CXXCastPath &Path)
9722 : Builder(Builder), Type(Type), Kind(Kind), Path(Path) {}
9725 class DerefBuilder: public ExprBuilder {
9726 const ExprBuilder &Builder;
9729 Expr *build(Sema &S, SourceLocation Loc) const override {
9730 return assertNotNull(
9731 S.CreateBuiltinUnaryOp(Loc, UO_Deref, Builder.build(S, Loc)).get());
9734 DerefBuilder(const ExprBuilder &Builder) : Builder(Builder) {}
9737 class MemberBuilder: public ExprBuilder {
9738 const ExprBuilder &Builder;
9742 LookupResult &MemberLookup;
9745 Expr *build(Sema &S, SourceLocation Loc) const override {
9746 return assertNotNull(S.BuildMemberReferenceExpr(
9747 Builder.build(S, Loc), Type, Loc, IsArrow, SS, SourceLocation(),
9748 nullptr, MemberLookup, nullptr, nullptr).get());
9751 MemberBuilder(const ExprBuilder &Builder, QualType Type, bool IsArrow,
9752 LookupResult &MemberLookup)
9753 : Builder(Builder), Type(Type), IsArrow(IsArrow),
9754 MemberLookup(MemberLookup) {}
9757 class MoveCastBuilder: public ExprBuilder {
9758 const ExprBuilder &Builder;
9761 Expr *build(Sema &S, SourceLocation Loc) const override {
9762 return assertNotNull(CastForMoving(S, Builder.build(S, Loc)));
9765 MoveCastBuilder(const ExprBuilder &Builder) : Builder(Builder) {}
9768 class LvalueConvBuilder: public ExprBuilder {
9769 const ExprBuilder &Builder;
9772 Expr *build(Sema &S, SourceLocation Loc) const override {
9773 return assertNotNull(
9774 S.DefaultLvalueConversion(Builder.build(S, Loc)).get());
9777 LvalueConvBuilder(const ExprBuilder &Builder) : Builder(Builder) {}
9780 class SubscriptBuilder: public ExprBuilder {
9781 const ExprBuilder &Base;
9782 const ExprBuilder &Index;
9785 Expr *build(Sema &S, SourceLocation Loc) const override {
9786 return assertNotNull(S.CreateBuiltinArraySubscriptExpr(
9787 Base.build(S, Loc), Loc, Index.build(S, Loc), Loc).get());
9790 SubscriptBuilder(const ExprBuilder &Base, const ExprBuilder &Index)
9791 : Base(Base), Index(Index) {}
9794 } // end anonymous namespace
9796 /// When generating a defaulted copy or move assignment operator, if a field
9797 /// should be copied with __builtin_memcpy rather than via explicit assignments,
9798 /// do so. This optimization only applies for arrays of scalars, and for arrays
9799 /// of class type where the selected copy/move-assignment operator is trivial.
9801 buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T,
9802 const ExprBuilder &ToB, const ExprBuilder &FromB) {
9803 // Compute the size of the memory buffer to be copied.
9804 QualType SizeType = S.Context.getSizeType();
9805 llvm::APInt Size(S.Context.getTypeSize(SizeType),
9806 S.Context.getTypeSizeInChars(T).getQuantity());
9808 // Take the address of the field references for "from" and "to". We
9809 // directly construct UnaryOperators here because semantic analysis
9810 // does not permit us to take the address of an xvalue.
9811 Expr *From = FromB.build(S, Loc);
9812 From = new (S.Context) UnaryOperator(From, UO_AddrOf,
9813 S.Context.getPointerType(From->getType()),
9814 VK_RValue, OK_Ordinary, Loc);
9815 Expr *To = ToB.build(S, Loc);
9816 To = new (S.Context) UnaryOperator(To, UO_AddrOf,
9817 S.Context.getPointerType(To->getType()),
9818 VK_RValue, OK_Ordinary, Loc);
9820 const Type *E = T->getBaseElementTypeUnsafe();
9821 bool NeedsCollectableMemCpy =
9822 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember();
9824 // Create a reference to the __builtin_objc_memmove_collectable function
9825 StringRef MemCpyName = NeedsCollectableMemCpy ?
9826 "__builtin_objc_memmove_collectable" :
9828 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc,
9829 Sema::LookupOrdinaryName);
9830 S.LookupName(R, S.TUScope, true);
9832 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>();
9834 // Something went horribly wrong earlier, and we will have complained
9838 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy,
9839 VK_RValue, Loc, nullptr);
9840 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail");
9842 Expr *CallArgs[] = {
9843 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc)
9845 ExprResult Call = S.ActOnCallExpr(/*Scope=*/nullptr, MemCpyRef.get(),
9846 Loc, CallArgs, Loc);
9848 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!");
9849 return Call.getAs<Stmt>();
9852 /// \brief Builds a statement that copies/moves the given entity from \p From to
9855 /// This routine is used to copy/move the members of a class with an
9856 /// implicitly-declared copy/move assignment operator. When the entities being
9857 /// copied are arrays, this routine builds for loops to copy them.
9859 /// \param S The Sema object used for type-checking.
9861 /// \param Loc The location where the implicit copy/move is being generated.
9863 /// \param T The type of the expressions being copied/moved. Both expressions
9864 /// must have this type.
9866 /// \param To The expression we are copying/moving to.
9868 /// \param From The expression we are copying/moving from.
9870 /// \param CopyingBaseSubobject Whether we're copying/moving a base subobject.
9871 /// Otherwise, it's a non-static member subobject.
9873 /// \param Copying Whether we're copying or moving.
9875 /// \param Depth Internal parameter recording the depth of the recursion.
9877 /// \returns A statement or a loop that copies the expressions, or StmtResult(0)
9878 /// if a memcpy should be used instead.
9880 buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T,
9881 const ExprBuilder &To, const ExprBuilder &From,
9882 bool CopyingBaseSubobject, bool Copying,
9883 unsigned Depth = 0) {
9884 // C++11 [class.copy]p28:
9885 // Each subobject is assigned in the manner appropriate to its type:
9887 // - if the subobject is of class type, as if by a call to operator= with
9888 // the subobject as the object expression and the corresponding
9889 // subobject of x as a single function argument (as if by explicit
9890 // qualification; that is, ignoring any possible virtual overriding
9891 // functions in more derived classes);
9893 // C++03 [class.copy]p13:
9894 // - if the subobject is of class type, the copy assignment operator for
9895 // the class is used (as if by explicit qualification; that is,
9896 // ignoring any possible virtual overriding functions in more derived
9898 if (const RecordType *RecordTy = T->getAs<RecordType>()) {
9899 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl());
9901 // Look for operator=.
9902 DeclarationName Name
9903 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal);
9904 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName);
9905 S.LookupQualifiedName(OpLookup, ClassDecl, false);
9907 // Prior to C++11, filter out any result that isn't a copy/move-assignment
9909 if (!S.getLangOpts().CPlusPlus11) {
9910 LookupResult::Filter F = OpLookup.makeFilter();
9911 while (F.hasNext()) {
9912 NamedDecl *D = F.next();
9913 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
9914 if (Method->isCopyAssignmentOperator() ||
9915 (!Copying && Method->isMoveAssignmentOperator()))
9923 // Suppress the protected check (C++ [class.protected]) for each of the
9924 // assignment operators we found. This strange dance is required when
9925 // we're assigning via a base classes's copy-assignment operator. To
9926 // ensure that we're getting the right base class subobject (without
9927 // ambiguities), we need to cast "this" to that subobject type; to
9928 // ensure that we don't go through the virtual call mechanism, we need
9929 // to qualify the operator= name with the base class (see below). However,
9930 // this means that if the base class has a protected copy assignment
9931 // operator, the protected member access check will fail. So, we
9932 // rewrite "protected" access to "public" access in this case, since we
9933 // know by construction that we're calling from a derived class.
9934 if (CopyingBaseSubobject) {
9935 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end();
9937 if (L.getAccess() == AS_protected)
9938 L.setAccess(AS_public);
9942 // Create the nested-name-specifier that will be used to qualify the
9943 // reference to operator=; this is required to suppress the virtual
9946 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr());
9947 SS.MakeTrivial(S.Context,
9948 NestedNameSpecifier::Create(S.Context, nullptr, false,
9952 // Create the reference to operator=.
9953 ExprResult OpEqualRef
9954 = S.BuildMemberReferenceExpr(To.build(S, Loc), T, Loc, /*isArrow=*/false,
9955 SS, /*TemplateKWLoc=*/SourceLocation(),
9956 /*FirstQualifierInScope=*/nullptr,
9958 /*TemplateArgs=*/nullptr, /*S*/nullptr,
9959 /*SuppressQualifierCheck=*/true);
9960 if (OpEqualRef.isInvalid())
9963 // Build the call to the assignment operator.
9965 Expr *FromInst = From.build(S, Loc);
9966 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/nullptr,
9967 OpEqualRef.getAs<Expr>(),
9968 Loc, FromInst, Loc);
9969 if (Call.isInvalid())
9972 // If we built a call to a trivial 'operator=' while copying an array,
9973 // bail out. We'll replace the whole shebang with a memcpy.
9974 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get());
9975 if (CE && CE->getMethodDecl()->isTrivial() && Depth)
9976 return StmtResult((Stmt*)nullptr);
9978 // Convert to an expression-statement, and clean up any produced
9980 return S.ActOnExprStmt(Call);
9983 // - if the subobject is of scalar type, the built-in assignment
9984 // operator is used.
9985 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T);
9987 ExprResult Assignment = S.CreateBuiltinBinOp(
9988 Loc, BO_Assign, To.build(S, Loc), From.build(S, Loc));
9989 if (Assignment.isInvalid())
9991 return S.ActOnExprStmt(Assignment);
9994 // - if the subobject is an array, each element is assigned, in the
9995 // manner appropriate to the element type;
9997 // Construct a loop over the array bounds, e.g.,
9999 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0)
10001 // that will copy each of the array elements.
10002 QualType SizeType = S.Context.getSizeType();
10004 // Create the iteration variable.
10005 IdentifierInfo *IterationVarName = nullptr;
10007 SmallString<8> Str;
10008 llvm::raw_svector_ostream OS(Str);
10009 OS << "__i" << Depth;
10010 IterationVarName = &S.Context.Idents.get(OS.str());
10012 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc,
10013 IterationVarName, SizeType,
10014 S.Context.getTrivialTypeSourceInfo(SizeType, Loc),
10017 // Initialize the iteration variable to zero.
10018 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0);
10019 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc));
10021 // Creates a reference to the iteration variable.
10022 RefBuilder IterationVarRef(IterationVar, SizeType);
10023 LvalueConvBuilder IterationVarRefRVal(IterationVarRef);
10025 // Create the DeclStmt that holds the iteration variable.
10026 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc);
10028 // Subscript the "from" and "to" expressions with the iteration variable.
10029 SubscriptBuilder FromIndexCopy(From, IterationVarRefRVal);
10030 MoveCastBuilder FromIndexMove(FromIndexCopy);
10031 const ExprBuilder *FromIndex;
10033 FromIndex = &FromIndexCopy;
10035 FromIndex = &FromIndexMove;
10037 SubscriptBuilder ToIndex(To, IterationVarRefRVal);
10039 // Build the copy/move for an individual element of the array.
10041 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(),
10042 ToIndex, *FromIndex, CopyingBaseSubobject,
10043 Copying, Depth + 1);
10044 // Bail out if copying fails or if we determined that we should use memcpy.
10045 if (Copy.isInvalid() || !Copy.get())
10048 // Create the comparison against the array bound.
10050 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType));
10052 = new (S.Context) BinaryOperator(IterationVarRefRVal.build(S, Loc),
10053 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc),
10054 BO_NE, S.Context.BoolTy,
10055 VK_RValue, OK_Ordinary, Loc, false);
10057 // Create the pre-increment of the iteration variable.
10059 = new (S.Context) UnaryOperator(IterationVarRef.build(S, Loc), UO_PreInc,
10060 SizeType, VK_LValue, OK_Ordinary, Loc);
10062 // Construct the loop that copies all elements of this array.
10063 return S.ActOnForStmt(
10064 Loc, Loc, InitStmt,
10065 S.ActOnCondition(nullptr, Loc, Comparison, Sema::ConditionKind::Boolean),
10066 S.MakeFullDiscardedValueExpr(Increment), Loc, Copy.get());
10070 buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T,
10071 const ExprBuilder &To, const ExprBuilder &From,
10072 bool CopyingBaseSubobject, bool Copying) {
10073 // Maybe we should use a memcpy?
10074 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() &&
10075 T.isTriviallyCopyableType(S.Context))
10076 return buildMemcpyForAssignmentOp(S, Loc, T, To, From);
10078 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From,
10079 CopyingBaseSubobject,
10082 // If we ended up picking a trivial assignment operator for an array of a
10083 // non-trivially-copyable class type, just emit a memcpy.
10084 if (!Result.isInvalid() && !Result.get())
10085 return buildMemcpyForAssignmentOp(S, Loc, T, To, From);
10090 Sema::ImplicitExceptionSpecification
10091 Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) {
10092 CXXRecordDecl *ClassDecl = MD->getParent();
10094 ImplicitExceptionSpecification ExceptSpec(*this);
10095 if (ClassDecl->isInvalidDecl())
10098 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>();
10099 assert(T->getNumParams() == 1 && "not a copy assignment op");
10100 unsigned ArgQuals =
10101 T->getParamType(0).getNonReferenceType().getCVRQualifiers();
10103 // C++ [except.spec]p14:
10104 // An implicitly declared special member function (Clause 12) shall have an
10105 // exception-specification. [...]
10107 // It is unspecified whether or not an implicit copy assignment operator
10108 // attempts to deduplicate calls to assignment operators of virtual bases are
10109 // made. As such, this exception specification is effectively unspecified.
10110 // Based on a similar decision made for constness in C++0x, we're erring on
10111 // the side of assuming such calls to be made regardless of whether they
10112 // actually happen.
10113 for (const auto &Base : ClassDecl->bases()) {
10114 if (Base.isVirtual())
10117 CXXRecordDecl *BaseClassDecl
10118 = cast<CXXRecordDecl>(Base.getType()->getAs<RecordType>()->getDecl());
10119 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl,
10120 ArgQuals, false, 0))
10121 ExceptSpec.CalledDecl(Base.getLocStart(), CopyAssign);
10124 for (const auto &Base : ClassDecl->vbases()) {
10125 CXXRecordDecl *BaseClassDecl
10126 = cast<CXXRecordDecl>(Base.getType()->getAs<RecordType>()->getDecl());
10127 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl,
10128 ArgQuals, false, 0))
10129 ExceptSpec.CalledDecl(Base.getLocStart(), CopyAssign);
10132 for (const auto *Field : ClassDecl->fields()) {
10133 QualType FieldType = Context.getBaseElementType(Field->getType());
10134 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
10135 if (CXXMethodDecl *CopyAssign =
10136 LookupCopyingAssignment(FieldClassDecl,
10137 ArgQuals | FieldType.getCVRQualifiers(),
10139 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign);
10146 CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) {
10147 // Note: The following rules are largely analoguous to the copy
10148 // constructor rules. Note that virtual bases are not taken into account
10149 // for determining the argument type of the operator. Note also that
10150 // operators taking an object instead of a reference are allowed.
10151 assert(ClassDecl->needsImplicitCopyAssignment());
10153 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment);
10154 if (DSM.isAlreadyBeingDeclared())
10157 QualType ArgType = Context.getTypeDeclType(ClassDecl);
10158 QualType RetType = Context.getLValueReferenceType(ArgType);
10159 bool Const = ClassDecl->implicitCopyAssignmentHasConstParam();
10161 ArgType = ArgType.withConst();
10162 ArgType = Context.getLValueReferenceType(ArgType);
10164 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
10168 // An implicitly-declared copy assignment operator is an inline public
10169 // member of its class.
10170 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
10171 SourceLocation ClassLoc = ClassDecl->getLocation();
10172 DeclarationNameInfo NameInfo(Name, ClassLoc);
10173 CXXMethodDecl *CopyAssignment =
10174 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(),
10175 /*TInfo=*/nullptr, /*StorageClass=*/SC_None,
10176 /*isInline=*/true, Constexpr, SourceLocation());
10177 CopyAssignment->setAccess(AS_public);
10178 CopyAssignment->setDefaulted();
10179 CopyAssignment->setImplicit();
10181 if (getLangOpts().CUDA) {
10182 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyAssignment,
10184 /* ConstRHS */ Const,
10185 /* Diagnose */ false);
10188 // Build an exception specification pointing back at this member.
10189 FunctionProtoType::ExtProtoInfo EPI =
10190 getImplicitMethodEPI(*this, CopyAssignment);
10191 CopyAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI));
10193 // Add the parameter to the operator.
10194 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment,
10195 ClassLoc, ClassLoc,
10196 /*Id=*/nullptr, ArgType,
10197 /*TInfo=*/nullptr, SC_None,
10199 CopyAssignment->setParams(FromParam);
10201 CopyAssignment->setTrivial(
10202 ClassDecl->needsOverloadResolutionForCopyAssignment()
10203 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment)
10204 : ClassDecl->hasTrivialCopyAssignment());
10206 // Note that we have added this copy-assignment operator.
10207 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared;
10209 Scope *S = getScopeForContext(ClassDecl);
10210 CheckImplicitSpecialMemberDeclaration(S, CopyAssignment);
10212 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment))
10213 SetDeclDeleted(CopyAssignment, ClassLoc);
10216 PushOnScopeChains(CopyAssignment, S, false);
10217 ClassDecl->addDecl(CopyAssignment);
10219 return CopyAssignment;
10222 /// Diagnose an implicit copy operation for a class which is odr-used, but
10223 /// which is deprecated because the class has a user-declared copy constructor,
10224 /// copy assignment operator, or destructor.
10225 static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp,
10226 SourceLocation UseLoc) {
10227 assert(CopyOp->isImplicit());
10229 CXXRecordDecl *RD = CopyOp->getParent();
10230 CXXMethodDecl *UserDeclaredOperation = nullptr;
10232 // In Microsoft mode, assignment operations don't affect constructors and
10234 if (RD->hasUserDeclaredDestructor()) {
10235 UserDeclaredOperation = RD->getDestructor();
10236 } else if (!isa<CXXConstructorDecl>(CopyOp) &&
10237 RD->hasUserDeclaredCopyConstructor() &&
10238 !S.getLangOpts().MSVCCompat) {
10239 // Find any user-declared copy constructor.
10240 for (auto *I : RD->ctors()) {
10241 if (I->isCopyConstructor()) {
10242 UserDeclaredOperation = I;
10246 assert(UserDeclaredOperation);
10247 } else if (isa<CXXConstructorDecl>(CopyOp) &&
10248 RD->hasUserDeclaredCopyAssignment() &&
10249 !S.getLangOpts().MSVCCompat) {
10250 // Find any user-declared move assignment operator.
10251 for (auto *I : RD->methods()) {
10252 if (I->isCopyAssignmentOperator()) {
10253 UserDeclaredOperation = I;
10257 assert(UserDeclaredOperation);
10260 if (UserDeclaredOperation) {
10261 S.Diag(UserDeclaredOperation->getLocation(),
10262 diag::warn_deprecated_copy_operation)
10263 << RD << /*copy assignment*/!isa<CXXConstructorDecl>(CopyOp)
10264 << /*destructor*/isa<CXXDestructorDecl>(UserDeclaredOperation);
10265 S.Diag(UseLoc, diag::note_member_synthesized_at)
10266 << (isa<CXXConstructorDecl>(CopyOp) ? Sema::CXXCopyConstructor
10267 : Sema::CXXCopyAssignment)
10272 void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation,
10273 CXXMethodDecl *CopyAssignOperator) {
10274 assert((CopyAssignOperator->isDefaulted() &&
10275 CopyAssignOperator->isOverloadedOperator() &&
10276 CopyAssignOperator->getOverloadedOperator() == OO_Equal &&
10277 !CopyAssignOperator->doesThisDeclarationHaveABody() &&
10278 !CopyAssignOperator->isDeleted()) &&
10279 "DefineImplicitCopyAssignment called for wrong function");
10281 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent();
10283 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) {
10284 CopyAssignOperator->setInvalidDecl();
10288 // C++11 [class.copy]p18:
10289 // The [definition of an implicitly declared copy assignment operator] is
10290 // deprecated if the class has a user-declared copy constructor or a
10291 // user-declared destructor.
10292 if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit())
10293 diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator, CurrentLocation);
10295 CopyAssignOperator->markUsed(Context);
10297 SynthesizedFunctionScope Scope(*this, CopyAssignOperator);
10298 DiagnosticErrorTrap Trap(Diags);
10300 // C++0x [class.copy]p30:
10301 // The implicitly-defined or explicitly-defaulted copy assignment operator
10302 // for a non-union class X performs memberwise copy assignment of its
10303 // subobjects. The direct base classes of X are assigned first, in the
10304 // order of their declaration in the base-specifier-list, and then the
10305 // immediate non-static data members of X are assigned, in the order in
10306 // which they were declared in the class definition.
10308 // The statements that form the synthesized function body.
10309 SmallVector<Stmt*, 8> Statements;
10311 // The parameter for the "other" object, which we are copying from.
10312 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0);
10313 Qualifiers OtherQuals = Other->getType().getQualifiers();
10314 QualType OtherRefType = Other->getType();
10315 if (const LValueReferenceType *OtherRef
10316 = OtherRefType->getAs<LValueReferenceType>()) {
10317 OtherRefType = OtherRef->getPointeeType();
10318 OtherQuals = OtherRefType.getQualifiers();
10321 // Our location for everything implicitly-generated.
10322 SourceLocation Loc = CopyAssignOperator->getLocEnd().isValid()
10323 ? CopyAssignOperator->getLocEnd()
10324 : CopyAssignOperator->getLocation();
10326 // Builds a DeclRefExpr for the "other" object.
10327 RefBuilder OtherRef(Other, OtherRefType);
10329 // Builds the "this" pointer.
10332 // Assign base classes.
10333 bool Invalid = false;
10334 for (auto &Base : ClassDecl->bases()) {
10335 // Form the assignment:
10336 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other));
10337 QualType BaseType = Base.getType().getUnqualifiedType();
10338 if (!BaseType->isRecordType()) {
10343 CXXCastPath BasePath;
10344 BasePath.push_back(&Base);
10346 // Construct the "from" expression, which is an implicit cast to the
10347 // appropriately-qualified base type.
10348 CastBuilder From(OtherRef, Context.getQualifiedType(BaseType, OtherQuals),
10349 VK_LValue, BasePath);
10351 // Dereference "this".
10352 DerefBuilder DerefThis(This);
10353 CastBuilder To(DerefThis,
10354 Context.getCVRQualifiedType(
10355 BaseType, CopyAssignOperator->getTypeQualifiers()),
10356 VK_LValue, BasePath);
10359 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType,
10361 /*CopyingBaseSubobject=*/true,
10363 if (Copy.isInvalid()) {
10364 Diag(CurrentLocation, diag::note_member_synthesized_at)
10365 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
10366 CopyAssignOperator->setInvalidDecl();
10370 // Success! Record the copy.
10371 Statements.push_back(Copy.getAs<Expr>());
10374 // Assign non-static members.
10375 for (auto *Field : ClassDecl->fields()) {
10376 // FIXME: We should form some kind of AST representation for the implied
10377 // memcpy in a union copy operation.
10378 if (Field->isUnnamedBitfield() || Field->getParent()->isUnion())
10381 if (Field->isInvalidDecl()) {
10386 // Check for members of reference type; we can't copy those.
10387 if (Field->getType()->isReferenceType()) {
10388 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
10389 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
10390 Diag(Field->getLocation(), diag::note_declared_at);
10391 Diag(CurrentLocation, diag::note_member_synthesized_at)
10392 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
10397 // Check for members of const-qualified, non-class type.
10398 QualType BaseType = Context.getBaseElementType(Field->getType());
10399 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
10400 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
10401 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
10402 Diag(Field->getLocation(), diag::note_declared_at);
10403 Diag(CurrentLocation, diag::note_member_synthesized_at)
10404 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
10409 // Suppress assigning zero-width bitfields.
10410 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0)
10413 QualType FieldType = Field->getType().getNonReferenceType();
10414 if (FieldType->isIncompleteArrayType()) {
10415 assert(ClassDecl->hasFlexibleArrayMember() &&
10416 "Incomplete array type is not valid");
10420 // Build references to the field in the object we're copying from and to.
10421 CXXScopeSpec SS; // Intentionally empty
10422 LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
10424 MemberLookup.addDecl(Field);
10425 MemberLookup.resolveKind();
10427 MemberBuilder From(OtherRef, OtherRefType, /*IsArrow=*/false, MemberLookup);
10429 MemberBuilder To(This, getCurrentThisType(), /*IsArrow=*/true, MemberLookup);
10431 // Build the copy of this field.
10432 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType,
10434 /*CopyingBaseSubobject=*/false,
10436 if (Copy.isInvalid()) {
10437 Diag(CurrentLocation, diag::note_member_synthesized_at)
10438 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
10439 CopyAssignOperator->setInvalidDecl();
10443 // Success! Record the copy.
10444 Statements.push_back(Copy.getAs<Stmt>());
10448 // Add a "return *this;"
10449 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc));
10451 StmtResult Return = BuildReturnStmt(Loc, ThisObj.get());
10452 if (Return.isInvalid())
10455 Statements.push_back(Return.getAs<Stmt>());
10457 if (Trap.hasErrorOccurred()) {
10458 Diag(CurrentLocation, diag::note_member_synthesized_at)
10459 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl);
10465 // The exception specification is needed because we are defining the
10467 ResolveExceptionSpec(CurrentLocation,
10468 CopyAssignOperator->getType()->castAs<FunctionProtoType>());
10471 CopyAssignOperator->setInvalidDecl();
10477 CompoundScopeRAII CompoundScope(*this);
10478 Body = ActOnCompoundStmt(Loc, Loc, Statements,
10479 /*isStmtExpr=*/false);
10480 assert(!Body.isInvalid() && "Compound statement creation cannot fail");
10482 CopyAssignOperator->setBody(Body.getAs<Stmt>());
10484 if (ASTMutationListener *L = getASTMutationListener()) {
10485 L->CompletedImplicitDefinition(CopyAssignOperator);
10489 Sema::ImplicitExceptionSpecification
10490 Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) {
10491 CXXRecordDecl *ClassDecl = MD->getParent();
10493 ImplicitExceptionSpecification ExceptSpec(*this);
10494 if (ClassDecl->isInvalidDecl())
10497 // C++0x [except.spec]p14:
10498 // An implicitly declared special member function (Clause 12) shall have an
10499 // exception-specification. [...]
10501 // It is unspecified whether or not an implicit move assignment operator
10502 // attempts to deduplicate calls to assignment operators of virtual bases are
10503 // made. As such, this exception specification is effectively unspecified.
10504 // Based on a similar decision made for constness in C++0x, we're erring on
10505 // the side of assuming such calls to be made regardless of whether they
10506 // actually happen.
10507 // Note that a move constructor is not implicitly declared when there are
10508 // virtual bases, but it can still be user-declared and explicitly defaulted.
10509 for (const auto &Base : ClassDecl->bases()) {
10510 if (Base.isVirtual())
10513 CXXRecordDecl *BaseClassDecl
10514 = cast<CXXRecordDecl>(Base.getType()->getAs<RecordType>()->getDecl());
10515 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl,
10517 ExceptSpec.CalledDecl(Base.getLocStart(), MoveAssign);
10520 for (const auto &Base : ClassDecl->vbases()) {
10521 CXXRecordDecl *BaseClassDecl
10522 = cast<CXXRecordDecl>(Base.getType()->getAs<RecordType>()->getDecl());
10523 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl,
10525 ExceptSpec.CalledDecl(Base.getLocStart(), MoveAssign);
10528 for (const auto *Field : ClassDecl->fields()) {
10529 QualType FieldType = Context.getBaseElementType(Field->getType());
10530 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
10531 if (CXXMethodDecl *MoveAssign =
10532 LookupMovingAssignment(FieldClassDecl,
10533 FieldType.getCVRQualifiers(),
10535 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign);
10542 CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) {
10543 assert(ClassDecl->needsImplicitMoveAssignment());
10545 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment);
10546 if (DSM.isAlreadyBeingDeclared())
10549 // Note: The following rules are largely analoguous to the move
10550 // constructor rules.
10552 QualType ArgType = Context.getTypeDeclType(ClassDecl);
10553 QualType RetType = Context.getLValueReferenceType(ArgType);
10554 ArgType = Context.getRValueReferenceType(ArgType);
10556 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
10560 // An implicitly-declared move assignment operator is an inline public
10561 // member of its class.
10562 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal);
10563 SourceLocation ClassLoc = ClassDecl->getLocation();
10564 DeclarationNameInfo NameInfo(Name, ClassLoc);
10565 CXXMethodDecl *MoveAssignment =
10566 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(),
10567 /*TInfo=*/nullptr, /*StorageClass=*/SC_None,
10568 /*isInline=*/true, Constexpr, SourceLocation());
10569 MoveAssignment->setAccess(AS_public);
10570 MoveAssignment->setDefaulted();
10571 MoveAssignment->setImplicit();
10573 if (getLangOpts().CUDA) {
10574 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveAssignment,
10576 /* ConstRHS */ false,
10577 /* Diagnose */ false);
10580 // Build an exception specification pointing back at this member.
10581 FunctionProtoType::ExtProtoInfo EPI =
10582 getImplicitMethodEPI(*this, MoveAssignment);
10583 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI));
10585 // Add the parameter to the operator.
10586 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment,
10587 ClassLoc, ClassLoc,
10588 /*Id=*/nullptr, ArgType,
10589 /*TInfo=*/nullptr, SC_None,
10591 MoveAssignment->setParams(FromParam);
10593 MoveAssignment->setTrivial(
10594 ClassDecl->needsOverloadResolutionForMoveAssignment()
10595 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment)
10596 : ClassDecl->hasTrivialMoveAssignment());
10598 // Note that we have added this copy-assignment operator.
10599 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared;
10601 Scope *S = getScopeForContext(ClassDecl);
10602 CheckImplicitSpecialMemberDeclaration(S, MoveAssignment);
10604 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) {
10605 ClassDecl->setImplicitMoveAssignmentIsDeleted();
10606 SetDeclDeleted(MoveAssignment, ClassLoc);
10610 PushOnScopeChains(MoveAssignment, S, false);
10611 ClassDecl->addDecl(MoveAssignment);
10613 return MoveAssignment;
10616 /// Check if we're implicitly defining a move assignment operator for a class
10617 /// with virtual bases. Such a move assignment might move-assign the virtual
10618 /// base multiple times.
10619 static void checkMoveAssignmentForRepeatedMove(Sema &S, CXXRecordDecl *Class,
10620 SourceLocation CurrentLocation) {
10621 assert(!Class->isDependentContext() && "should not define dependent move");
10623 // Only a virtual base could get implicitly move-assigned multiple times.
10624 // Only a non-trivial move assignment can observe this. We only want to
10625 // diagnose if we implicitly define an assignment operator that assigns
10626 // two base classes, both of which move-assign the same virtual base.
10627 if (Class->getNumVBases() == 0 || Class->hasTrivialMoveAssignment() ||
10628 Class->getNumBases() < 2)
10631 llvm::SmallVector<CXXBaseSpecifier *, 16> Worklist;
10632 typedef llvm::DenseMap<CXXRecordDecl*, CXXBaseSpecifier*> VBaseMap;
10635 for (auto &BI : Class->bases()) {
10636 Worklist.push_back(&BI);
10637 while (!Worklist.empty()) {
10638 CXXBaseSpecifier *BaseSpec = Worklist.pop_back_val();
10639 CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl();
10641 // If the base has no non-trivial move assignment operators,
10642 // we don't care about moves from it.
10643 if (!Base->hasNonTrivialMoveAssignment())
10646 // If there's nothing virtual here, skip it.
10647 if (!BaseSpec->isVirtual() && !Base->getNumVBases())
10650 // If we're not actually going to call a move assignment for this base,
10651 // or the selected move assignment is trivial, skip it.
10652 Sema::SpecialMemberOverloadResult *SMOR =
10653 S.LookupSpecialMember(Base, Sema::CXXMoveAssignment,
10654 /*ConstArg*/false, /*VolatileArg*/false,
10655 /*RValueThis*/true, /*ConstThis*/false,
10656 /*VolatileThis*/false);
10657 if (!SMOR->getMethod() || SMOR->getMethod()->isTrivial() ||
10658 !SMOR->getMethod()->isMoveAssignmentOperator())
10661 if (BaseSpec->isVirtual()) {
10662 // We're going to move-assign this virtual base, and its move
10663 // assignment operator is not trivial. If this can happen for
10664 // multiple distinct direct bases of Class, diagnose it. (If it
10665 // only happens in one base, we'll diagnose it when synthesizing
10666 // that base class's move assignment operator.)
10667 CXXBaseSpecifier *&Existing =
10668 VBases.insert(std::make_pair(Base->getCanonicalDecl(), &BI))
10670 if (Existing && Existing != &BI) {
10671 S.Diag(CurrentLocation, diag::warn_vbase_moved_multiple_times)
10673 S.Diag(Existing->getLocStart(), diag::note_vbase_moved_here)
10674 << (Base->getCanonicalDecl() ==
10675 Existing->getType()->getAsCXXRecordDecl()->getCanonicalDecl())
10676 << Base << Existing->getType() << Existing->getSourceRange();
10677 S.Diag(BI.getLocStart(), diag::note_vbase_moved_here)
10678 << (Base->getCanonicalDecl() ==
10679 BI.getType()->getAsCXXRecordDecl()->getCanonicalDecl())
10680 << Base << BI.getType() << BaseSpec->getSourceRange();
10682 // Only diagnose each vbase once.
10683 Existing = nullptr;
10686 // Only walk over bases that have defaulted move assignment operators.
10687 // We assume that any user-provided move assignment operator handles
10688 // the multiple-moves-of-vbase case itself somehow.
10689 if (!SMOR->getMethod()->isDefaulted())
10692 // We're going to move the base classes of Base. Add them to the list.
10693 for (auto &BI : Base->bases())
10694 Worklist.push_back(&BI);
10700 void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation,
10701 CXXMethodDecl *MoveAssignOperator) {
10702 assert((MoveAssignOperator->isDefaulted() &&
10703 MoveAssignOperator->isOverloadedOperator() &&
10704 MoveAssignOperator->getOverloadedOperator() == OO_Equal &&
10705 !MoveAssignOperator->doesThisDeclarationHaveABody() &&
10706 !MoveAssignOperator->isDeleted()) &&
10707 "DefineImplicitMoveAssignment called for wrong function");
10709 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent();
10711 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) {
10712 MoveAssignOperator->setInvalidDecl();
10716 MoveAssignOperator->markUsed(Context);
10718 SynthesizedFunctionScope Scope(*this, MoveAssignOperator);
10719 DiagnosticErrorTrap Trap(Diags);
10721 // C++0x [class.copy]p28:
10722 // The implicitly-defined or move assignment operator for a non-union class
10723 // X performs memberwise move assignment of its subobjects. The direct base
10724 // classes of X are assigned first, in the order of their declaration in the
10725 // base-specifier-list, and then the immediate non-static data members of X
10726 // are assigned, in the order in which they were declared in the class
10729 // Issue a warning if our implicit move assignment operator will move
10730 // from a virtual base more than once.
10731 checkMoveAssignmentForRepeatedMove(*this, ClassDecl, CurrentLocation);
10733 // The statements that form the synthesized function body.
10734 SmallVector<Stmt*, 8> Statements;
10736 // The parameter for the "other" object, which we are move from.
10737 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0);
10738 QualType OtherRefType = Other->getType()->
10739 getAs<RValueReferenceType>()->getPointeeType();
10740 assert(!OtherRefType.getQualifiers() &&
10741 "Bad argument type of defaulted move assignment");
10743 // Our location for everything implicitly-generated.
10744 SourceLocation Loc = MoveAssignOperator->getLocEnd().isValid()
10745 ? MoveAssignOperator->getLocEnd()
10746 : MoveAssignOperator->getLocation();
10748 // Builds a reference to the "other" object.
10749 RefBuilder OtherRef(Other, OtherRefType);
10751 MoveCastBuilder MoveOther(OtherRef);
10753 // Builds the "this" pointer.
10756 // Assign base classes.
10757 bool Invalid = false;
10758 for (auto &Base : ClassDecl->bases()) {
10759 // C++11 [class.copy]p28:
10760 // It is unspecified whether subobjects representing virtual base classes
10761 // are assigned more than once by the implicitly-defined copy assignment
10763 // FIXME: Do not assign to a vbase that will be assigned by some other base
10764 // class. For a move-assignment, this can result in the vbase being moved
10767 // Form the assignment:
10768 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other));
10769 QualType BaseType = Base.getType().getUnqualifiedType();
10770 if (!BaseType->isRecordType()) {
10775 CXXCastPath BasePath;
10776 BasePath.push_back(&Base);
10778 // Construct the "from" expression, which is an implicit cast to the
10779 // appropriately-qualified base type.
10780 CastBuilder From(OtherRef, BaseType, VK_XValue, BasePath);
10782 // Dereference "this".
10783 DerefBuilder DerefThis(This);
10785 // Implicitly cast "this" to the appropriately-qualified base type.
10786 CastBuilder To(DerefThis,
10787 Context.getCVRQualifiedType(
10788 BaseType, MoveAssignOperator->getTypeQualifiers()),
10789 VK_LValue, BasePath);
10792 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType,
10794 /*CopyingBaseSubobject=*/true,
10795 /*Copying=*/false);
10796 if (Move.isInvalid()) {
10797 Diag(CurrentLocation, diag::note_member_synthesized_at)
10798 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
10799 MoveAssignOperator->setInvalidDecl();
10803 // Success! Record the move.
10804 Statements.push_back(Move.getAs<Expr>());
10807 // Assign non-static members.
10808 for (auto *Field : ClassDecl->fields()) {
10809 // FIXME: We should form some kind of AST representation for the implied
10810 // memcpy in a union copy operation.
10811 if (Field->isUnnamedBitfield() || Field->getParent()->isUnion())
10814 if (Field->isInvalidDecl()) {
10819 // Check for members of reference type; we can't move those.
10820 if (Field->getType()->isReferenceType()) {
10821 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
10822 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
10823 Diag(Field->getLocation(), diag::note_declared_at);
10824 Diag(CurrentLocation, diag::note_member_synthesized_at)
10825 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
10830 // Check for members of const-qualified, non-class type.
10831 QualType BaseType = Context.getBaseElementType(Field->getType());
10832 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) {
10833 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
10834 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
10835 Diag(Field->getLocation(), diag::note_declared_at);
10836 Diag(CurrentLocation, diag::note_member_synthesized_at)
10837 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
10842 // Suppress assigning zero-width bitfields.
10843 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0)
10846 QualType FieldType = Field->getType().getNonReferenceType();
10847 if (FieldType->isIncompleteArrayType()) {
10848 assert(ClassDecl->hasFlexibleArrayMember() &&
10849 "Incomplete array type is not valid");
10853 // Build references to the field in the object we're copying from and to.
10854 LookupResult MemberLookup(*this, Field->getDeclName(), Loc,
10856 MemberLookup.addDecl(Field);
10857 MemberLookup.resolveKind();
10858 MemberBuilder From(MoveOther, OtherRefType,
10859 /*IsArrow=*/false, MemberLookup);
10860 MemberBuilder To(This, getCurrentThisType(),
10861 /*IsArrow=*/true, MemberLookup);
10863 assert(!From.build(*this, Loc)->isLValue() && // could be xvalue or prvalue
10864 "Member reference with rvalue base must be rvalue except for reference "
10865 "members, which aren't allowed for move assignment.");
10867 // Build the move of this field.
10868 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType,
10870 /*CopyingBaseSubobject=*/false,
10871 /*Copying=*/false);
10872 if (Move.isInvalid()) {
10873 Diag(CurrentLocation, diag::note_member_synthesized_at)
10874 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
10875 MoveAssignOperator->setInvalidDecl();
10879 // Success! Record the copy.
10880 Statements.push_back(Move.getAs<Stmt>());
10884 // Add a "return *this;"
10885 ExprResult ThisObj =
10886 CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc));
10888 StmtResult Return = BuildReturnStmt(Loc, ThisObj.get());
10889 if (Return.isInvalid())
10892 Statements.push_back(Return.getAs<Stmt>());
10894 if (Trap.hasErrorOccurred()) {
10895 Diag(CurrentLocation, diag::note_member_synthesized_at)
10896 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl);
10902 // The exception specification is needed because we are defining the
10904 ResolveExceptionSpec(CurrentLocation,
10905 MoveAssignOperator->getType()->castAs<FunctionProtoType>());
10908 MoveAssignOperator->setInvalidDecl();
10914 CompoundScopeRAII CompoundScope(*this);
10915 Body = ActOnCompoundStmt(Loc, Loc, Statements,
10916 /*isStmtExpr=*/false);
10917 assert(!Body.isInvalid() && "Compound statement creation cannot fail");
10919 MoveAssignOperator->setBody(Body.getAs<Stmt>());
10921 if (ASTMutationListener *L = getASTMutationListener()) {
10922 L->CompletedImplicitDefinition(MoveAssignOperator);
10926 Sema::ImplicitExceptionSpecification
10927 Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) {
10928 CXXRecordDecl *ClassDecl = MD->getParent();
10930 ImplicitExceptionSpecification ExceptSpec(*this);
10931 if (ClassDecl->isInvalidDecl())
10934 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>();
10935 assert(T->getNumParams() >= 1 && "not a copy ctor");
10936 unsigned Quals = T->getParamType(0).getNonReferenceType().getCVRQualifiers();
10938 // C++ [except.spec]p14:
10939 // An implicitly declared special member function (Clause 12) shall have an
10940 // exception-specification. [...]
10941 for (const auto &Base : ClassDecl->bases()) {
10942 // Virtual bases are handled below.
10943 if (Base.isVirtual())
10946 CXXRecordDecl *BaseClassDecl
10947 = cast<CXXRecordDecl>(Base.getType()->getAs<RecordType>()->getDecl());
10948 if (CXXConstructorDecl *CopyConstructor =
10949 LookupCopyingConstructor(BaseClassDecl, Quals))
10950 ExceptSpec.CalledDecl(Base.getLocStart(), CopyConstructor);
10952 for (const auto &Base : ClassDecl->vbases()) {
10953 CXXRecordDecl *BaseClassDecl
10954 = cast<CXXRecordDecl>(Base.getType()->getAs<RecordType>()->getDecl());
10955 if (CXXConstructorDecl *CopyConstructor =
10956 LookupCopyingConstructor(BaseClassDecl, Quals))
10957 ExceptSpec.CalledDecl(Base.getLocStart(), CopyConstructor);
10959 for (const auto *Field : ClassDecl->fields()) {
10960 QualType FieldType = Context.getBaseElementType(Field->getType());
10961 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) {
10962 if (CXXConstructorDecl *CopyConstructor =
10963 LookupCopyingConstructor(FieldClassDecl,
10964 Quals | FieldType.getCVRQualifiers()))
10965 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor);
10972 CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor(
10973 CXXRecordDecl *ClassDecl) {
10974 // C++ [class.copy]p4:
10975 // If the class definition does not explicitly declare a copy
10976 // constructor, one is declared implicitly.
10977 assert(ClassDecl->needsImplicitCopyConstructor());
10979 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor);
10980 if (DSM.isAlreadyBeingDeclared())
10983 QualType ClassType = Context.getTypeDeclType(ClassDecl);
10984 QualType ArgType = ClassType;
10985 bool Const = ClassDecl->implicitCopyConstructorHasConstParam();
10987 ArgType = ArgType.withConst();
10988 ArgType = Context.getLValueReferenceType(ArgType);
10990 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
10991 CXXCopyConstructor,
10994 DeclarationName Name
10995 = Context.DeclarationNames.getCXXConstructorName(
10996 Context.getCanonicalType(ClassType));
10997 SourceLocation ClassLoc = ClassDecl->getLocation();
10998 DeclarationNameInfo NameInfo(Name, ClassLoc);
11000 // An implicitly-declared copy constructor is an inline public
11001 // member of its class.
11002 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create(
11003 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr,
11004 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true,
11006 CopyConstructor->setAccess(AS_public);
11007 CopyConstructor->setDefaulted();
11009 if (getLangOpts().CUDA) {
11010 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyConstructor,
11012 /* ConstRHS */ Const,
11013 /* Diagnose */ false);
11016 // Build an exception specification pointing back at this member.
11017 FunctionProtoType::ExtProtoInfo EPI =
11018 getImplicitMethodEPI(*this, CopyConstructor);
11019 CopyConstructor->setType(
11020 Context.getFunctionType(Context.VoidTy, ArgType, EPI));
11022 // Add the parameter to the constructor.
11023 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor,
11024 ClassLoc, ClassLoc,
11025 /*IdentifierInfo=*/nullptr,
11026 ArgType, /*TInfo=*/nullptr,
11028 CopyConstructor->setParams(FromParam);
11030 CopyConstructor->setTrivial(
11031 ClassDecl->needsOverloadResolutionForCopyConstructor()
11032 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor)
11033 : ClassDecl->hasTrivialCopyConstructor());
11035 // Note that we have declared this constructor.
11036 ++ASTContext::NumImplicitCopyConstructorsDeclared;
11038 Scope *S = getScopeForContext(ClassDecl);
11039 CheckImplicitSpecialMemberDeclaration(S, CopyConstructor);
11041 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor))
11042 SetDeclDeleted(CopyConstructor, ClassLoc);
11045 PushOnScopeChains(CopyConstructor, S, false);
11046 ClassDecl->addDecl(CopyConstructor);
11048 return CopyConstructor;
11051 void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
11052 CXXConstructorDecl *CopyConstructor) {
11053 assert((CopyConstructor->isDefaulted() &&
11054 CopyConstructor->isCopyConstructor() &&
11055 !CopyConstructor->doesThisDeclarationHaveABody() &&
11056 !CopyConstructor->isDeleted()) &&
11057 "DefineImplicitCopyConstructor - call it for implicit copy ctor");
11059 CXXRecordDecl *ClassDecl = CopyConstructor->getParent();
11060 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor");
11062 // C++11 [class.copy]p7:
11063 // The [definition of an implicitly declared copy constructor] is
11064 // deprecated if the class has a user-declared copy assignment operator
11065 // or a user-declared destructor.
11066 if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit())
11067 diagnoseDeprecatedCopyOperation(*this, CopyConstructor, CurrentLocation);
11069 SynthesizedFunctionScope Scope(*this, CopyConstructor);
11070 DiagnosticErrorTrap Trap(Diags);
11072 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false) ||
11073 Trap.hasErrorOccurred()) {
11074 Diag(CurrentLocation, diag::note_member_synthesized_at)
11075 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl);
11076 CopyConstructor->setInvalidDecl();
11078 SourceLocation Loc = CopyConstructor->getLocEnd().isValid()
11079 ? CopyConstructor->getLocEnd()
11080 : CopyConstructor->getLocation();
11081 Sema::CompoundScopeRAII CompoundScope(*this);
11082 CopyConstructor->setBody(
11083 ActOnCompoundStmt(Loc, Loc, None, /*isStmtExpr=*/false).getAs<Stmt>());
11086 // The exception specification is needed because we are defining the
11088 ResolveExceptionSpec(CurrentLocation,
11089 CopyConstructor->getType()->castAs<FunctionProtoType>());
11091 CopyConstructor->markUsed(Context);
11092 MarkVTableUsed(CurrentLocation, ClassDecl);
11094 if (ASTMutationListener *L = getASTMutationListener()) {
11095 L->CompletedImplicitDefinition(CopyConstructor);
11099 Sema::ImplicitExceptionSpecification
11100 Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) {
11101 CXXRecordDecl *ClassDecl = MD->getParent();
11103 // C++ [except.spec]p14:
11104 // An implicitly declared special member function (Clause 12) shall have an
11105 // exception-specification. [...]
11106 ImplicitExceptionSpecification ExceptSpec(*this);
11107 if (ClassDecl->isInvalidDecl())
11110 // Direct base-class constructors.
11111 for (const auto &B : ClassDecl->bases()) {
11112 if (B.isVirtual()) // Handled below.
11115 if (const RecordType *BaseType = B.getType()->getAs<RecordType>()) {
11116 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
11117 CXXConstructorDecl *Constructor =
11118 LookupMovingConstructor(BaseClassDecl, 0);
11119 // If this is a deleted function, add it anyway. This might be conformant
11120 // with the standard. This might not. I'm not sure. It might not matter.
11122 ExceptSpec.CalledDecl(B.getLocStart(), Constructor);
11126 // Virtual base-class constructors.
11127 for (const auto &B : ClassDecl->vbases()) {
11128 if (const RecordType *BaseType = B.getType()->getAs<RecordType>()) {
11129 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
11130 CXXConstructorDecl *Constructor =
11131 LookupMovingConstructor(BaseClassDecl, 0);
11132 // If this is a deleted function, add it anyway. This might be conformant
11133 // with the standard. This might not. I'm not sure. It might not matter.
11135 ExceptSpec.CalledDecl(B.getLocStart(), Constructor);
11139 // Field constructors.
11140 for (const auto *F : ClassDecl->fields()) {
11141 QualType FieldType = Context.getBaseElementType(F->getType());
11142 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) {
11143 CXXConstructorDecl *Constructor =
11144 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers());
11145 // If this is a deleted function, add it anyway. This might be conformant
11146 // with the standard. This might not. I'm not sure. It might not matter.
11147 // In particular, the problem is that this function never gets called. It
11148 // might just be ill-formed because this function attempts to refer to
11149 // a deleted function here.
11151 ExceptSpec.CalledDecl(F->getLocation(), Constructor);
11158 CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor(
11159 CXXRecordDecl *ClassDecl) {
11160 assert(ClassDecl->needsImplicitMoveConstructor());
11162 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor);
11163 if (DSM.isAlreadyBeingDeclared())
11166 QualType ClassType = Context.getTypeDeclType(ClassDecl);
11167 QualType ArgType = Context.getRValueReferenceType(ClassType);
11169 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl,
11170 CXXMoveConstructor,
11173 DeclarationName Name
11174 = Context.DeclarationNames.getCXXConstructorName(
11175 Context.getCanonicalType(ClassType));
11176 SourceLocation ClassLoc = ClassDecl->getLocation();
11177 DeclarationNameInfo NameInfo(Name, ClassLoc);
11179 // C++11 [class.copy]p11:
11180 // An implicitly-declared copy/move constructor is an inline public
11181 // member of its class.
11182 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create(
11183 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr,
11184 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true,
11186 MoveConstructor->setAccess(AS_public);
11187 MoveConstructor->setDefaulted();
11189 if (getLangOpts().CUDA) {
11190 inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveConstructor,
11192 /* ConstRHS */ false,
11193 /* Diagnose */ false);
11196 // Build an exception specification pointing back at this member.
11197 FunctionProtoType::ExtProtoInfo EPI =
11198 getImplicitMethodEPI(*this, MoveConstructor);
11199 MoveConstructor->setType(
11200 Context.getFunctionType(Context.VoidTy, ArgType, EPI));
11202 // Add the parameter to the constructor.
11203 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor,
11204 ClassLoc, ClassLoc,
11205 /*IdentifierInfo=*/nullptr,
11206 ArgType, /*TInfo=*/nullptr,
11208 MoveConstructor->setParams(FromParam);
11210 MoveConstructor->setTrivial(
11211 ClassDecl->needsOverloadResolutionForMoveConstructor()
11212 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor)
11213 : ClassDecl->hasTrivialMoveConstructor());
11215 // Note that we have declared this constructor.
11216 ++ASTContext::NumImplicitMoveConstructorsDeclared;
11218 Scope *S = getScopeForContext(ClassDecl);
11219 CheckImplicitSpecialMemberDeclaration(S, MoveConstructor);
11221 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) {
11222 ClassDecl->setImplicitMoveConstructorIsDeleted();
11223 SetDeclDeleted(MoveConstructor, ClassLoc);
11227 PushOnScopeChains(MoveConstructor, S, false);
11228 ClassDecl->addDecl(MoveConstructor);
11230 return MoveConstructor;
11233 void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation,
11234 CXXConstructorDecl *MoveConstructor) {
11235 assert((MoveConstructor->isDefaulted() &&
11236 MoveConstructor->isMoveConstructor() &&
11237 !MoveConstructor->doesThisDeclarationHaveABody() &&
11238 !MoveConstructor->isDeleted()) &&
11239 "DefineImplicitMoveConstructor - call it for implicit move ctor");
11241 CXXRecordDecl *ClassDecl = MoveConstructor->getParent();
11242 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor");
11244 SynthesizedFunctionScope Scope(*this, MoveConstructor);
11245 DiagnosticErrorTrap Trap(Diags);
11247 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false) ||
11248 Trap.hasErrorOccurred()) {
11249 Diag(CurrentLocation, diag::note_member_synthesized_at)
11250 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl);
11251 MoveConstructor->setInvalidDecl();
11253 SourceLocation Loc = MoveConstructor->getLocEnd().isValid()
11254 ? MoveConstructor->getLocEnd()
11255 : MoveConstructor->getLocation();
11256 Sema::CompoundScopeRAII CompoundScope(*this);
11257 MoveConstructor->setBody(ActOnCompoundStmt(
11258 Loc, Loc, None, /*isStmtExpr=*/ false).getAs<Stmt>());
11261 // The exception specification is needed because we are defining the
11263 ResolveExceptionSpec(CurrentLocation,
11264 MoveConstructor->getType()->castAs<FunctionProtoType>());
11266 MoveConstructor->markUsed(Context);
11267 MarkVTableUsed(CurrentLocation, ClassDecl);
11269 if (ASTMutationListener *L = getASTMutationListener()) {
11270 L->CompletedImplicitDefinition(MoveConstructor);
11274 bool Sema::isImplicitlyDeleted(FunctionDecl *FD) {
11275 return FD->isDeleted() && FD->isDefaulted() && isa<CXXMethodDecl>(FD);
11278 void Sema::DefineImplicitLambdaToFunctionPointerConversion(
11279 SourceLocation CurrentLocation,
11280 CXXConversionDecl *Conv) {
11281 CXXRecordDecl *Lambda = Conv->getParent();
11282 CXXMethodDecl *CallOp = Lambda->getLambdaCallOperator();
11283 // If we are defining a specialization of a conversion to function-ptr
11284 // cache the deduced template arguments for this specialization
11285 // so that we can use them to retrieve the corresponding call-operator
11286 // and static-invoker.
11287 const TemplateArgumentList *DeducedTemplateArgs = nullptr;
11289 // Retrieve the corresponding call-operator specialization.
11290 if (Lambda->isGenericLambda()) {
11291 assert(Conv->isFunctionTemplateSpecialization());
11292 FunctionTemplateDecl *CallOpTemplate =
11293 CallOp->getDescribedFunctionTemplate();
11294 DeducedTemplateArgs = Conv->getTemplateSpecializationArgs();
11295 void *InsertPos = nullptr;
11296 FunctionDecl *CallOpSpec = CallOpTemplate->findSpecialization(
11297 DeducedTemplateArgs->asArray(),
11299 assert(CallOpSpec &&
11300 "Conversion operator must have a corresponding call operator");
11301 CallOp = cast<CXXMethodDecl>(CallOpSpec);
11303 // Mark the call operator referenced (and add to pending instantiations
11305 // For both the conversion and static-invoker template specializations
11306 // we construct their body's in this function, so no need to add them
11307 // to the PendingInstantiations.
11308 MarkFunctionReferenced(CurrentLocation, CallOp);
11310 SynthesizedFunctionScope Scope(*this, Conv);
11311 DiagnosticErrorTrap Trap(Diags);
11313 // Retrieve the static invoker...
11314 CXXMethodDecl *Invoker = Lambda->getLambdaStaticInvoker();
11315 // ... and get the corresponding specialization for a generic lambda.
11316 if (Lambda->isGenericLambda()) {
11317 assert(DeducedTemplateArgs &&
11318 "Must have deduced template arguments from Conversion Operator");
11319 FunctionTemplateDecl *InvokeTemplate =
11320 Invoker->getDescribedFunctionTemplate();
11321 void *InsertPos = nullptr;
11322 FunctionDecl *InvokeSpec = InvokeTemplate->findSpecialization(
11323 DeducedTemplateArgs->asArray(),
11325 assert(InvokeSpec &&
11326 "Must have a corresponding static invoker specialization");
11327 Invoker = cast<CXXMethodDecl>(InvokeSpec);
11329 // Construct the body of the conversion function { return __invoke; }.
11330 Expr *FunctionRef = BuildDeclRefExpr(Invoker, Invoker->getType(),
11331 VK_LValue, Conv->getLocation()).get();
11332 assert(FunctionRef && "Can't refer to __invoke function?");
11333 Stmt *Return = BuildReturnStmt(Conv->getLocation(), FunctionRef).get();
11334 Conv->setBody(new (Context) CompoundStmt(Context, Return,
11335 Conv->getLocation(),
11336 Conv->getLocation()));
11338 Conv->markUsed(Context);
11339 Conv->setReferenced();
11341 // Fill in the __invoke function with a dummy implementation. IR generation
11342 // will fill in the actual details.
11343 Invoker->markUsed(Context);
11344 Invoker->setReferenced();
11345 Invoker->setBody(new (Context) CompoundStmt(Conv->getLocation()));
11347 if (ASTMutationListener *L = getASTMutationListener()) {
11348 L->CompletedImplicitDefinition(Conv);
11349 L->CompletedImplicitDefinition(Invoker);
11355 void Sema::DefineImplicitLambdaToBlockPointerConversion(
11356 SourceLocation CurrentLocation,
11357 CXXConversionDecl *Conv)
11359 assert(!Conv->getParent()->isGenericLambda());
11361 Conv->markUsed(Context);
11363 SynthesizedFunctionScope Scope(*this, Conv);
11364 DiagnosticErrorTrap Trap(Diags);
11366 // Copy-initialize the lambda object as needed to capture it.
11367 Expr *This = ActOnCXXThis(CurrentLocation).get();
11368 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).get();
11370 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation,
11371 Conv->getLocation(),
11374 // If we're not under ARC, make sure we still get the _Block_copy/autorelease
11375 // behavior. Note that only the general conversion function does this
11376 // (since it's unusable otherwise); in the case where we inline the
11377 // block literal, it has block literal lifetime semantics.
11378 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount)
11379 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(),
11380 CK_CopyAndAutoreleaseBlockObject,
11381 BuildBlock.get(), nullptr, VK_RValue);
11383 if (BuildBlock.isInvalid()) {
11384 Diag(CurrentLocation, diag::note_lambda_to_block_conv);
11385 Conv->setInvalidDecl();
11389 // Create the return statement that returns the block from the conversion
11391 StmtResult Return = BuildReturnStmt(Conv->getLocation(), BuildBlock.get());
11392 if (Return.isInvalid()) {
11393 Diag(CurrentLocation, diag::note_lambda_to_block_conv);
11394 Conv->setInvalidDecl();
11398 // Set the body of the conversion function.
11399 Stmt *ReturnS = Return.get();
11400 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS,
11401 Conv->getLocation(),
11402 Conv->getLocation()));
11404 // We're done; notify the mutation listener, if any.
11405 if (ASTMutationListener *L = getASTMutationListener()) {
11406 L->CompletedImplicitDefinition(Conv);
11410 /// \brief Determine whether the given list arguments contains exactly one
11411 /// "real" (non-default) argument.
11412 static bool hasOneRealArgument(MultiExprArg Args) {
11413 switch (Args.size()) {
11418 if (!Args[1]->isDefaultArgument())
11423 return !Args[0]->isDefaultArgument();
11430 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
11431 NamedDecl *FoundDecl,
11432 CXXConstructorDecl *Constructor,
11433 MultiExprArg ExprArgs,
11434 bool HadMultipleCandidates,
11435 bool IsListInitialization,
11436 bool IsStdInitListInitialization,
11437 bool RequiresZeroInit,
11438 unsigned ConstructKind,
11439 SourceRange ParenRange) {
11440 bool Elidable = false;
11442 // C++0x [class.copy]p34:
11443 // When certain criteria are met, an implementation is allowed to
11444 // omit the copy/move construction of a class object, even if the
11445 // copy/move constructor and/or destructor for the object have
11446 // side effects. [...]
11447 // - when a temporary class object that has not been bound to a
11448 // reference (12.2) would be copied/moved to a class object
11449 // with the same cv-unqualified type, the copy/move operation
11450 // can be omitted by constructing the temporary object
11451 // directly into the target of the omitted copy/move
11452 if (ConstructKind == CXXConstructExpr::CK_Complete && Constructor &&
11453 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) {
11454 Expr *SubExpr = ExprArgs[0];
11455 Elidable = SubExpr->isTemporaryObject(
11456 Context, cast<CXXRecordDecl>(FoundDecl->getDeclContext()));
11459 return BuildCXXConstructExpr(ConstructLoc, DeclInitType,
11460 FoundDecl, Constructor,
11461 Elidable, ExprArgs, HadMultipleCandidates,
11462 IsListInitialization,
11463 IsStdInitListInitialization, RequiresZeroInit,
11464 ConstructKind, ParenRange);
11468 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
11469 NamedDecl *FoundDecl,
11470 CXXConstructorDecl *Constructor,
11472 MultiExprArg ExprArgs,
11473 bool HadMultipleCandidates,
11474 bool IsListInitialization,
11475 bool IsStdInitListInitialization,
11476 bool RequiresZeroInit,
11477 unsigned ConstructKind,
11478 SourceRange ParenRange) {
11479 if (auto *Shadow = dyn_cast<ConstructorUsingShadowDecl>(FoundDecl)) {
11480 Constructor = findInheritingConstructor(ConstructLoc, Constructor, Shadow);
11481 if (DiagnoseUseOfDecl(Constructor, ConstructLoc))
11482 return ExprError();
11485 return BuildCXXConstructExpr(
11486 ConstructLoc, DeclInitType, Constructor, Elidable, ExprArgs,
11487 HadMultipleCandidates, IsListInitialization, IsStdInitListInitialization,
11488 RequiresZeroInit, ConstructKind, ParenRange);
11491 /// BuildCXXConstructExpr - Creates a complete call to a constructor,
11492 /// including handling of its default argument expressions.
11494 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
11495 CXXConstructorDecl *Constructor,
11497 MultiExprArg ExprArgs,
11498 bool HadMultipleCandidates,
11499 bool IsListInitialization,
11500 bool IsStdInitListInitialization,
11501 bool RequiresZeroInit,
11502 unsigned ConstructKind,
11503 SourceRange ParenRange) {
11504 assert(declaresSameEntity(
11505 Constructor->getParent(),
11506 DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) &&
11507 "given constructor for wrong type");
11508 MarkFunctionReferenced(ConstructLoc, Constructor);
11510 return CXXConstructExpr::Create(
11511 Context, DeclInitType, ConstructLoc, Constructor, Elidable,
11512 ExprArgs, HadMultipleCandidates, IsListInitialization,
11513 IsStdInitListInitialization, RequiresZeroInit,
11514 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind),
11518 ExprResult Sema::BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field) {
11519 assert(Field->hasInClassInitializer());
11521 // If we already have the in-class initializer nothing needs to be done.
11522 if (Field->getInClassInitializer())
11523 return CXXDefaultInitExpr::Create(Context, Loc, Field);
11525 // Maybe we haven't instantiated the in-class initializer. Go check the
11526 // pattern FieldDecl to see if it has one.
11527 CXXRecordDecl *ParentRD = cast<CXXRecordDecl>(Field->getParent());
11529 if (isTemplateInstantiation(ParentRD->getTemplateSpecializationKind())) {
11530 CXXRecordDecl *ClassPattern = ParentRD->getTemplateInstantiationPattern();
11531 DeclContext::lookup_result Lookup =
11532 ClassPattern->lookup(Field->getDeclName());
11534 // Lookup can return at most two results: the pattern for the field, or the
11535 // injected class name of the parent record. No other member can have the
11536 // same name as the field.
11537 assert(!Lookup.empty() && Lookup.size() <= 2 &&
11538 "more than two lookup results for field name");
11539 FieldDecl *Pattern = dyn_cast<FieldDecl>(Lookup[0]);
11541 assert(isa<CXXRecordDecl>(Lookup[0]) &&
11542 "cannot have other non-field member with same name");
11543 Pattern = cast<FieldDecl>(Lookup[1]);
11546 if (InstantiateInClassInitializer(Loc, Field, Pattern,
11547 getTemplateInstantiationArgs(Field)))
11548 return ExprError();
11549 return CXXDefaultInitExpr::Create(Context, Loc, Field);
11553 // If the brace-or-equal-initializer of a non-static data member
11554 // invokes a defaulted default constructor of its class or of an
11555 // enclosing class in a potentially evaluated subexpression, the
11556 // program is ill-formed.
11558 // This resolution is unworkable: the exception specification of the
11559 // default constructor can be needed in an unevaluated context, in
11560 // particular, in the operand of a noexcept-expression, and we can be
11561 // unable to compute an exception specification for an enclosed class.
11563 // Any attempt to resolve the exception specification of a defaulted default
11564 // constructor before the initializer is lexically complete will ultimately
11565 // come here at which point we can diagnose it.
11566 RecordDecl *OutermostClass = ParentRD->getOuterLexicalRecordContext();
11567 if (OutermostClass == ParentRD) {
11568 Diag(Field->getLocEnd(), diag::err_in_class_initializer_not_yet_parsed)
11569 << ParentRD << Field;
11571 Diag(Field->getLocEnd(),
11572 diag::err_in_class_initializer_not_yet_parsed_outer_class)
11573 << ParentRD << OutermostClass << Field;
11576 return ExprError();
11579 void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) {
11580 if (VD->isInvalidDecl()) return;
11582 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl());
11583 if (ClassDecl->isInvalidDecl()) return;
11584 if (ClassDecl->hasIrrelevantDestructor()) return;
11585 if (ClassDecl->isDependentContext()) return;
11587 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl);
11588 MarkFunctionReferenced(VD->getLocation(), Destructor);
11589 CheckDestructorAccess(VD->getLocation(), Destructor,
11590 PDiag(diag::err_access_dtor_var)
11591 << VD->getDeclName()
11593 DiagnoseUseOfDecl(Destructor, VD->getLocation());
11595 if (Destructor->isTrivial()) return;
11596 if (!VD->hasGlobalStorage()) return;
11598 // Emit warning for non-trivial dtor in global scope (a real global,
11599 // class-static, function-static).
11600 Diag(VD->getLocation(), diag::warn_exit_time_destructor);
11602 // TODO: this should be re-enabled for static locals by !CXAAtExit
11603 if (!VD->isStaticLocal())
11604 Diag(VD->getLocation(), diag::warn_global_destructor);
11607 /// \brief Given a constructor and the set of arguments provided for the
11608 /// constructor, convert the arguments and add any required default arguments
11609 /// to form a proper call to this constructor.
11611 /// \returns true if an error occurred, false otherwise.
11613 Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor,
11614 MultiExprArg ArgsPtr,
11615 SourceLocation Loc,
11616 SmallVectorImpl<Expr*> &ConvertedArgs,
11617 bool AllowExplicit,
11618 bool IsListInitialization) {
11619 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall.
11620 unsigned NumArgs = ArgsPtr.size();
11621 Expr **Args = ArgsPtr.data();
11623 const FunctionProtoType *Proto
11624 = Constructor->getType()->getAs<FunctionProtoType>();
11625 assert(Proto && "Constructor without a prototype?");
11626 unsigned NumParams = Proto->getNumParams();
11628 // If too few arguments are available, we'll fill in the rest with defaults.
11629 if (NumArgs < NumParams)
11630 ConvertedArgs.reserve(NumParams);
11632 ConvertedArgs.reserve(NumArgs);
11634 VariadicCallType CallType =
11635 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;
11636 SmallVector<Expr *, 8> AllArgs;
11637 bool Invalid = GatherArgumentsForCall(Loc, Constructor,
11639 llvm::makeArrayRef(Args, NumArgs),
11641 CallType, AllowExplicit,
11642 IsListInitialization);
11643 ConvertedArgs.append(AllArgs.begin(), AllArgs.end());
11645 DiagnoseSentinelCalls(Constructor, Loc, AllArgs);
11647 CheckConstructorCall(Constructor,
11648 llvm::makeArrayRef(AllArgs.data(), AllArgs.size()),
11655 CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef,
11656 const FunctionDecl *FnDecl) {
11657 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext();
11658 if (isa<NamespaceDecl>(DC)) {
11659 return SemaRef.Diag(FnDecl->getLocation(),
11660 diag::err_operator_new_delete_declared_in_namespace)
11661 << FnDecl->getDeclName();
11664 if (isa<TranslationUnitDecl>(DC) &&
11665 FnDecl->getStorageClass() == SC_Static) {
11666 return SemaRef.Diag(FnDecl->getLocation(),
11667 diag::err_operator_new_delete_declared_static)
11668 << FnDecl->getDeclName();
11675 CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl,
11676 CanQualType ExpectedResultType,
11677 CanQualType ExpectedFirstParamType,
11678 unsigned DependentParamTypeDiag,
11679 unsigned InvalidParamTypeDiag) {
11680 QualType ResultType =
11681 FnDecl->getType()->getAs<FunctionType>()->getReturnType();
11683 // Check that the result type is not dependent.
11684 if (ResultType->isDependentType())
11685 return SemaRef.Diag(FnDecl->getLocation(),
11686 diag::err_operator_new_delete_dependent_result_type)
11687 << FnDecl->getDeclName() << ExpectedResultType;
11689 // Check that the result type is what we expect.
11690 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType)
11691 return SemaRef.Diag(FnDecl->getLocation(),
11692 diag::err_operator_new_delete_invalid_result_type)
11693 << FnDecl->getDeclName() << ExpectedResultType;
11695 // A function template must have at least 2 parameters.
11696 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2)
11697 return SemaRef.Diag(FnDecl->getLocation(),
11698 diag::err_operator_new_delete_template_too_few_parameters)
11699 << FnDecl->getDeclName();
11701 // The function decl must have at least 1 parameter.
11702 if (FnDecl->getNumParams() == 0)
11703 return SemaRef.Diag(FnDecl->getLocation(),
11704 diag::err_operator_new_delete_too_few_parameters)
11705 << FnDecl->getDeclName();
11707 // Check the first parameter type is not dependent.
11708 QualType FirstParamType = FnDecl->getParamDecl(0)->getType();
11709 if (FirstParamType->isDependentType())
11710 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag)
11711 << FnDecl->getDeclName() << ExpectedFirstParamType;
11713 // Check that the first parameter type is what we expect.
11714 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() !=
11715 ExpectedFirstParamType)
11716 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag)
11717 << FnDecl->getDeclName() << ExpectedFirstParamType;
11723 CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
11724 // C++ [basic.stc.dynamic.allocation]p1:
11725 // A program is ill-formed if an allocation function is declared in a
11726 // namespace scope other than global scope or declared static in global
11728 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
11731 CanQualType SizeTy =
11732 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType());
11734 // C++ [basic.stc.dynamic.allocation]p1:
11735 // The return type shall be void*. The first parameter shall have type
11737 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy,
11739 diag::err_operator_new_dependent_param_type,
11740 diag::err_operator_new_param_type))
11743 // C++ [basic.stc.dynamic.allocation]p1:
11744 // The first parameter shall not have an associated default argument.
11745 if (FnDecl->getParamDecl(0)->hasDefaultArg())
11746 return SemaRef.Diag(FnDecl->getLocation(),
11747 diag::err_operator_new_default_arg)
11748 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange();
11754 CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) {
11755 // C++ [basic.stc.dynamic.deallocation]p1:
11756 // A program is ill-formed if deallocation functions are declared in a
11757 // namespace scope other than global scope or declared static in global
11759 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
11762 // C++ [basic.stc.dynamic.deallocation]p2:
11763 // Each deallocation function shall return void and its first parameter
11765 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy,
11766 SemaRef.Context.VoidPtrTy,
11767 diag::err_operator_delete_dependent_param_type,
11768 diag::err_operator_delete_param_type))
11774 /// CheckOverloadedOperatorDeclaration - Check whether the declaration
11775 /// of this overloaded operator is well-formed. If so, returns false;
11776 /// otherwise, emits appropriate diagnostics and returns true.
11777 bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
11778 assert(FnDecl && FnDecl->isOverloadedOperator() &&
11779 "Expected an overloaded operator declaration");
11781 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator();
11783 // C++ [over.oper]p5:
11784 // The allocation and deallocation functions, operator new,
11785 // operator new[], operator delete and operator delete[], are
11786 // described completely in 3.7.3. The attributes and restrictions
11787 // found in the rest of this subclause do not apply to them unless
11788 // explicitly stated in 3.7.3.
11789 if (Op == OO_Delete || Op == OO_Array_Delete)
11790 return CheckOperatorDeleteDeclaration(*this, FnDecl);
11792 if (Op == OO_New || Op == OO_Array_New)
11793 return CheckOperatorNewDeclaration(*this, FnDecl);
11795 // C++ [over.oper]p6:
11796 // An operator function shall either be a non-static member
11797 // function or be a non-member function and have at least one
11798 // parameter whose type is a class, a reference to a class, an
11799 // enumeration, or a reference to an enumeration.
11800 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) {
11801 if (MethodDecl->isStatic())
11802 return Diag(FnDecl->getLocation(),
11803 diag::err_operator_overload_static) << FnDecl->getDeclName();
11805 bool ClassOrEnumParam = false;
11806 for (auto Param : FnDecl->parameters()) {
11807 QualType ParamType = Param->getType().getNonReferenceType();
11808 if (ParamType->isDependentType() || ParamType->isRecordType() ||
11809 ParamType->isEnumeralType()) {
11810 ClassOrEnumParam = true;
11815 if (!ClassOrEnumParam)
11816 return Diag(FnDecl->getLocation(),
11817 diag::err_operator_overload_needs_class_or_enum)
11818 << FnDecl->getDeclName();
11821 // C++ [over.oper]p8:
11822 // An operator function cannot have default arguments (8.3.6),
11823 // except where explicitly stated below.
11825 // Only the function-call operator allows default arguments
11826 // (C++ [over.call]p1).
11827 if (Op != OO_Call) {
11828 for (auto Param : FnDecl->parameters()) {
11829 if (Param->hasDefaultArg())
11830 return Diag(Param->getLocation(),
11831 diag::err_operator_overload_default_arg)
11832 << FnDecl->getDeclName() << Param->getDefaultArgRange();
11836 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = {
11837 { false, false, false }
11838 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
11839 , { Unary, Binary, MemberOnly }
11840 #include "clang/Basic/OperatorKinds.def"
11843 bool CanBeUnaryOperator = OperatorUses[Op][0];
11844 bool CanBeBinaryOperator = OperatorUses[Op][1];
11845 bool MustBeMemberOperator = OperatorUses[Op][2];
11847 // C++ [over.oper]p8:
11848 // [...] Operator functions cannot have more or fewer parameters
11849 // than the number required for the corresponding operator, as
11850 // described in the rest of this subclause.
11851 unsigned NumParams = FnDecl->getNumParams()
11852 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0);
11853 if (Op != OO_Call &&
11854 ((NumParams == 1 && !CanBeUnaryOperator) ||
11855 (NumParams == 2 && !CanBeBinaryOperator) ||
11856 (NumParams < 1) || (NumParams > 2))) {
11857 // We have the wrong number of parameters.
11858 unsigned ErrorKind;
11859 if (CanBeUnaryOperator && CanBeBinaryOperator) {
11860 ErrorKind = 2; // 2 -> unary or binary.
11861 } else if (CanBeUnaryOperator) {
11862 ErrorKind = 0; // 0 -> unary
11864 assert(CanBeBinaryOperator &&
11865 "All non-call overloaded operators are unary or binary!");
11866 ErrorKind = 1; // 1 -> binary
11869 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be)
11870 << FnDecl->getDeclName() << NumParams << ErrorKind;
11873 // Overloaded operators other than operator() cannot be variadic.
11874 if (Op != OO_Call &&
11875 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) {
11876 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic)
11877 << FnDecl->getDeclName();
11880 // Some operators must be non-static member functions.
11881 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) {
11882 return Diag(FnDecl->getLocation(),
11883 diag::err_operator_overload_must_be_member)
11884 << FnDecl->getDeclName();
11887 // C++ [over.inc]p1:
11888 // The user-defined function called operator++ implements the
11889 // prefix and postfix ++ operator. If this function is a member
11890 // function with no parameters, or a non-member function with one
11891 // parameter of class or enumeration type, it defines the prefix
11892 // increment operator ++ for objects of that type. If the function
11893 // is a member function with one parameter (which shall be of type
11894 // int) or a non-member function with two parameters (the second
11895 // of which shall be of type int), it defines the postfix
11896 // increment operator ++ for objects of that type.
11897 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) {
11898 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1);
11899 QualType ParamType = LastParam->getType();
11901 if (!ParamType->isSpecificBuiltinType(BuiltinType::Int) &&
11902 !ParamType->isDependentType())
11903 return Diag(LastParam->getLocation(),
11904 diag::err_operator_overload_post_incdec_must_be_int)
11905 << LastParam->getType() << (Op == OO_MinusMinus);
11912 checkLiteralOperatorTemplateParameterList(Sema &SemaRef,
11913 FunctionTemplateDecl *TpDecl) {
11914 TemplateParameterList *TemplateParams = TpDecl->getTemplateParameters();
11916 // Must have one or two template parameters.
11917 if (TemplateParams->size() == 1) {
11918 NonTypeTemplateParmDecl *PmDecl =
11919 dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(0));
11921 // The template parameter must be a char parameter pack.
11922 if (PmDecl && PmDecl->isTemplateParameterPack() &&
11923 SemaRef.Context.hasSameType(PmDecl->getType(), SemaRef.Context.CharTy))
11926 } else if (TemplateParams->size() == 2) {
11927 TemplateTypeParmDecl *PmType =
11928 dyn_cast<TemplateTypeParmDecl>(TemplateParams->getParam(0));
11929 NonTypeTemplateParmDecl *PmArgs =
11930 dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(1));
11932 // The second template parameter must be a parameter pack with the
11933 // first template parameter as its type.
11934 if (PmType && PmArgs && !PmType->isTemplateParameterPack() &&
11935 PmArgs->isTemplateParameterPack()) {
11936 const TemplateTypeParmType *TArgs =
11937 PmArgs->getType()->getAs<TemplateTypeParmType>();
11938 if (TArgs && TArgs->getDepth() == PmType->getDepth() &&
11939 TArgs->getIndex() == PmType->getIndex()) {
11940 if (SemaRef.ActiveTemplateInstantiations.empty())
11941 SemaRef.Diag(TpDecl->getLocation(),
11942 diag::ext_string_literal_operator_template);
11948 SemaRef.Diag(TpDecl->getTemplateParameters()->getSourceRange().getBegin(),
11949 diag::err_literal_operator_template)
11950 << TpDecl->getTemplateParameters()->getSourceRange();
11954 /// CheckLiteralOperatorDeclaration - Check whether the declaration
11955 /// of this literal operator function is well-formed. If so, returns
11956 /// false; otherwise, emits appropriate diagnostics and returns true.
11957 bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) {
11958 if (isa<CXXMethodDecl>(FnDecl)) {
11959 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace)
11960 << FnDecl->getDeclName();
11964 if (FnDecl->isExternC()) {
11965 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c);
11969 // This might be the definition of a literal operator template.
11970 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate();
11972 // This might be a specialization of a literal operator template.
11974 TpDecl = FnDecl->getPrimaryTemplate();
11976 // template <char...> type operator "" name() and
11977 // template <class T, T...> type operator "" name() are the only valid
11978 // template signatures, and the only valid signatures with no parameters.
11980 if (FnDecl->param_size() != 0) {
11981 Diag(FnDecl->getLocation(),
11982 diag::err_literal_operator_template_with_params);
11986 if (checkLiteralOperatorTemplateParameterList(*this, TpDecl))
11989 } else if (FnDecl->param_size() == 1) {
11990 const ParmVarDecl *Param = FnDecl->getParamDecl(0);
11992 QualType ParamType = Param->getType().getUnqualifiedType();
11994 // Only unsigned long long int, long double, any character type, and const
11995 // char * are allowed as the only parameters.
11996 if (ParamType->isSpecificBuiltinType(BuiltinType::ULongLong) ||
11997 ParamType->isSpecificBuiltinType(BuiltinType::LongDouble) ||
11998 Context.hasSameType(ParamType, Context.CharTy) ||
11999 Context.hasSameType(ParamType, Context.WideCharTy) ||
12000 Context.hasSameType(ParamType, Context.Char16Ty) ||
12001 Context.hasSameType(ParamType, Context.Char32Ty)) {
12002 } else if (const PointerType *Ptr = ParamType->getAs<PointerType>()) {
12003 QualType InnerType = Ptr->getPointeeType();
12005 // Pointer parameter must be a const char *.
12006 if (!(Context.hasSameType(InnerType.getUnqualifiedType(),
12008 InnerType.isConstQualified() && !InnerType.isVolatileQualified())) {
12009 Diag(Param->getSourceRange().getBegin(),
12010 diag::err_literal_operator_param)
12011 << ParamType << "'const char *'" << Param->getSourceRange();
12015 } else if (ParamType->isRealFloatingType()) {
12016 Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param)
12017 << ParamType << Context.LongDoubleTy << Param->getSourceRange();
12020 } else if (ParamType->isIntegerType()) {
12021 Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param)
12022 << ParamType << Context.UnsignedLongLongTy << Param->getSourceRange();
12026 Diag(Param->getSourceRange().getBegin(),
12027 diag::err_literal_operator_invalid_param)
12028 << ParamType << Param->getSourceRange();
12032 } else if (FnDecl->param_size() == 2) {
12033 FunctionDecl::param_iterator Param = FnDecl->param_begin();
12035 // First, verify that the first parameter is correct.
12037 QualType FirstParamType = (*Param)->getType().getUnqualifiedType();
12039 // Two parameter function must have a pointer to const as a
12040 // first parameter; let's strip those qualifiers.
12041 const PointerType *PT = FirstParamType->getAs<PointerType>();
12044 Diag((*Param)->getSourceRange().getBegin(),
12045 diag::err_literal_operator_param)
12046 << FirstParamType << "'const char *'" << (*Param)->getSourceRange();
12050 QualType PointeeType = PT->getPointeeType();
12051 // First parameter must be const
12052 if (!PointeeType.isConstQualified() || PointeeType.isVolatileQualified()) {
12053 Diag((*Param)->getSourceRange().getBegin(),
12054 diag::err_literal_operator_param)
12055 << FirstParamType << "'const char *'" << (*Param)->getSourceRange();
12059 QualType InnerType = PointeeType.getUnqualifiedType();
12060 // Only const char *, const wchar_t*, const char16_t*, and const char32_t*
12061 // are allowed as the first parameter to a two-parameter function
12062 if (!(Context.hasSameType(InnerType, Context.CharTy) ||
12063 Context.hasSameType(InnerType, Context.WideCharTy) ||
12064 Context.hasSameType(InnerType, Context.Char16Ty) ||
12065 Context.hasSameType(InnerType, Context.Char32Ty))) {
12066 Diag((*Param)->getSourceRange().getBegin(),
12067 diag::err_literal_operator_param)
12068 << FirstParamType << "'const char *'" << (*Param)->getSourceRange();
12072 // Move on to the second and final parameter.
12075 // The second parameter must be a std::size_t.
12076 QualType SecondParamType = (*Param)->getType().getUnqualifiedType();
12077 if (!Context.hasSameType(SecondParamType, Context.getSizeType())) {
12078 Diag((*Param)->getSourceRange().getBegin(),
12079 diag::err_literal_operator_param)
12080 << SecondParamType << Context.getSizeType()
12081 << (*Param)->getSourceRange();
12085 Diag(FnDecl->getLocation(), diag::err_literal_operator_bad_param_count);
12089 // Parameters are good.
12091 // A parameter-declaration-clause containing a default argument is not
12092 // equivalent to any of the permitted forms.
12093 for (auto Param : FnDecl->parameters()) {
12094 if (Param->hasDefaultArg()) {
12095 Diag(Param->getDefaultArgRange().getBegin(),
12096 diag::err_literal_operator_default_argument)
12097 << Param->getDefaultArgRange();
12102 StringRef LiteralName
12103 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName();
12104 if (LiteralName[0] != '_') {
12105 // C++11 [usrlit.suffix]p1:
12106 // Literal suffix identifiers that do not start with an underscore
12107 // are reserved for future standardization.
12108 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved)
12109 << NumericLiteralParser::isValidUDSuffix(getLangOpts(), LiteralName);
12115 /// ActOnStartLinkageSpecification - Parsed the beginning of a C++
12116 /// linkage specification, including the language and (if present)
12117 /// the '{'. ExternLoc is the location of the 'extern', Lang is the
12118 /// language string literal. LBraceLoc, if valid, provides the location of
12119 /// the '{' brace. Otherwise, this linkage specification does not
12120 /// have any braces.
12121 Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc,
12123 SourceLocation LBraceLoc) {
12124 StringLiteral *Lit = cast<StringLiteral>(LangStr);
12125 if (!Lit->isAscii()) {
12126 Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_not_ascii)
12127 << LangStr->getSourceRange();
12131 StringRef Lang = Lit->getString();
12132 LinkageSpecDecl::LanguageIDs Language;
12134 Language = LinkageSpecDecl::lang_c;
12135 else if (Lang == "C++")
12136 Language = LinkageSpecDecl::lang_cxx;
12138 Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_unknown)
12139 << LangStr->getSourceRange();
12143 // FIXME: Add all the various semantics of linkage specifications
12145 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, ExternLoc,
12146 LangStr->getExprLoc(), Language,
12147 LBraceLoc.isValid());
12148 CurContext->addDecl(D);
12149 PushDeclContext(S, D);
12153 /// ActOnFinishLinkageSpecification - Complete the definition of
12154 /// the C++ linkage specification LinkageSpec. If RBraceLoc is
12155 /// valid, it's the position of the closing '}' brace in a linkage
12156 /// specification that uses braces.
12157 Decl *Sema::ActOnFinishLinkageSpecification(Scope *S,
12159 SourceLocation RBraceLoc) {
12160 if (RBraceLoc.isValid()) {
12161 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec);
12162 LSDecl->setRBraceLoc(RBraceLoc);
12165 return LinkageSpec;
12168 Decl *Sema::ActOnEmptyDeclaration(Scope *S,
12169 AttributeList *AttrList,
12170 SourceLocation SemiLoc) {
12171 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc);
12172 // Attribute declarations appertain to empty declaration so we handle
12175 ProcessDeclAttributeList(S, ED, AttrList);
12177 CurContext->addDecl(ED);
12181 /// \brief Perform semantic analysis for the variable declaration that
12182 /// occurs within a C++ catch clause, returning the newly-created
12184 VarDecl *Sema::BuildExceptionDeclaration(Scope *S,
12185 TypeSourceInfo *TInfo,
12186 SourceLocation StartLoc,
12187 SourceLocation Loc,
12188 IdentifierInfo *Name) {
12189 bool Invalid = false;
12190 QualType ExDeclType = TInfo->getType();
12192 // Arrays and functions decay.
12193 if (ExDeclType->isArrayType())
12194 ExDeclType = Context.getArrayDecayedType(ExDeclType);
12195 else if (ExDeclType->isFunctionType())
12196 ExDeclType = Context.getPointerType(ExDeclType);
12198 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type.
12199 // The exception-declaration shall not denote a pointer or reference to an
12200 // incomplete type, other than [cv] void*.
12201 // N2844 forbids rvalue references.
12202 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) {
12203 Diag(Loc, diag::err_catch_rvalue_ref);
12207 if (ExDeclType->isVariablyModifiedType()) {
12208 Diag(Loc, diag::err_catch_variably_modified) << ExDeclType;
12212 QualType BaseType = ExDeclType;
12213 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference
12214 unsigned DK = diag::err_catch_incomplete;
12215 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
12216 BaseType = Ptr->getPointeeType();
12218 DK = diag::err_catch_incomplete_ptr;
12219 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) {
12220 // For the purpose of error recovery, we treat rvalue refs like lvalue refs.
12221 BaseType = Ref->getPointeeType();
12223 DK = diag::err_catch_incomplete_ref;
12225 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) &&
12226 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK))
12229 if (!Invalid && !ExDeclType->isDependentType() &&
12230 RequireNonAbstractType(Loc, ExDeclType,
12231 diag::err_abstract_type_in_decl,
12232 AbstractVariableType))
12235 // Only the non-fragile NeXT runtime currently supports C++ catches
12236 // of ObjC types, and no runtime supports catching ObjC types by value.
12237 if (!Invalid && getLangOpts().ObjC1) {
12238 QualType T = ExDeclType;
12239 if (const ReferenceType *RT = T->getAs<ReferenceType>())
12240 T = RT->getPointeeType();
12242 if (T->isObjCObjectType()) {
12243 Diag(Loc, diag::err_objc_object_catch);
12245 } else if (T->isObjCObjectPointerType()) {
12246 // FIXME: should this be a test for macosx-fragile specifically?
12247 if (getLangOpts().ObjCRuntime.isFragile())
12248 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile);
12252 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name,
12253 ExDeclType, TInfo, SC_None);
12254 ExDecl->setExceptionVariable(true);
12256 // In ARC, infer 'retaining' for variables of retainable type.
12257 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl))
12260 if (!Invalid && !ExDeclType->isDependentType()) {
12261 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) {
12262 // Insulate this from anything else we might currently be parsing.
12263 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated);
12265 // C++ [except.handle]p16:
12266 // The object declared in an exception-declaration or, if the
12267 // exception-declaration does not specify a name, a temporary (12.2) is
12268 // copy-initialized (8.5) from the exception object. [...]
12269 // The object is destroyed when the handler exits, after the destruction
12270 // of any automatic objects initialized within the handler.
12272 // We just pretend to initialize the object with itself, then make sure
12273 // it can be destroyed later.
12274 QualType initType = Context.getExceptionObjectType(ExDeclType);
12276 InitializedEntity entity =
12277 InitializedEntity::InitializeVariable(ExDecl);
12278 InitializationKind initKind =
12279 InitializationKind::CreateCopy(Loc, SourceLocation());
12281 Expr *opaqueValue =
12282 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary);
12283 InitializationSequence sequence(*this, entity, initKind, opaqueValue);
12284 ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue);
12285 if (result.isInvalid())
12288 // If the constructor used was non-trivial, set this as the
12290 CXXConstructExpr *construct = result.getAs<CXXConstructExpr>();
12291 if (!construct->getConstructor()->isTrivial()) {
12292 Expr *init = MaybeCreateExprWithCleanups(construct);
12293 ExDecl->setInit(init);
12296 // And make sure it's destructable.
12297 FinalizeVarWithDestructor(ExDecl, recordType);
12303 ExDecl->setInvalidDecl();
12308 /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
12310 Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
12311 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
12312 bool Invalid = D.isInvalidType();
12314 // Check for unexpanded parameter packs.
12315 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
12316 UPPC_ExceptionType)) {
12317 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy,
12318 D.getIdentifierLoc());
12322 IdentifierInfo *II = D.getIdentifier();
12323 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(),
12324 LookupOrdinaryName,
12325 ForRedeclaration)) {
12326 // The scope should be freshly made just for us. There is just no way
12327 // it contains any previous declaration, except for function parameters in
12328 // a function-try-block's catch statement.
12329 assert(!S->isDeclScope(PrevDecl));
12330 if (isDeclInScope(PrevDecl, CurContext, S)) {
12331 Diag(D.getIdentifierLoc(), diag::err_redefinition)
12332 << D.getIdentifier();
12333 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
12335 } else if (PrevDecl->isTemplateParameter())
12336 // Maybe we will complain about the shadowed template parameter.
12337 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
12340 if (D.getCXXScopeSpec().isSet() && !Invalid) {
12341 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator)
12342 << D.getCXXScopeSpec().getRange();
12346 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo,
12348 D.getIdentifierLoc(),
12349 D.getIdentifier());
12351 ExDecl->setInvalidDecl();
12353 // Add the exception declaration into this scope.
12355 PushOnScopeChains(ExDecl, S);
12357 CurContext->addDecl(ExDecl);
12359 ProcessDeclAttributes(S, ExDecl, D);
12363 Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc,
12365 Expr *AssertMessageExpr,
12366 SourceLocation RParenLoc) {
12367 StringLiteral *AssertMessage =
12368 AssertMessageExpr ? cast<StringLiteral>(AssertMessageExpr) : nullptr;
12370 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression))
12373 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr,
12374 AssertMessage, RParenLoc, false);
12377 Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc,
12379 StringLiteral *AssertMessage,
12380 SourceLocation RParenLoc,
12382 assert(AssertExpr != nullptr && "Expected non-null condition");
12383 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() &&
12385 // In a static_assert-declaration, the constant-expression shall be a
12386 // constant expression that can be contextually converted to bool.
12387 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr);
12388 if (Converted.isInvalid())
12392 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond,
12393 diag::err_static_assert_expression_is_not_constant,
12394 /*AllowFold=*/false).isInvalid())
12397 if (!Failed && !Cond) {
12398 SmallString<256> MsgBuffer;
12399 llvm::raw_svector_ostream Msg(MsgBuffer);
12401 AssertMessage->printPretty(Msg, nullptr, getPrintingPolicy());
12402 Diag(StaticAssertLoc, diag::err_static_assert_failed)
12403 << !AssertMessage << Msg.str() << AssertExpr->getSourceRange();
12408 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc,
12409 AssertExpr, AssertMessage, RParenLoc,
12412 CurContext->addDecl(Decl);
12416 /// \brief Perform semantic analysis of the given friend type declaration.
12418 /// \returns A friend declaration that.
12419 FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart,
12420 SourceLocation FriendLoc,
12421 TypeSourceInfo *TSInfo) {
12422 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration");
12424 QualType T = TSInfo->getType();
12425 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange();
12427 // C++03 [class.friend]p2:
12428 // An elaborated-type-specifier shall be used in a friend declaration
12431 // * The class-key of the elaborated-type-specifier is required.
12432 if (!ActiveTemplateInstantiations.empty()) {
12433 // Do not complain about the form of friend template types during
12434 // template instantiation; we will already have complained when the
12435 // template was declared.
12437 if (!T->isElaboratedTypeSpecifier()) {
12438 // If we evaluated the type to a record type, suggest putting
12440 if (const RecordType *RT = T->getAs<RecordType>()) {
12441 RecordDecl *RD = RT->getDecl();
12443 SmallString<16> InsertionText(" ");
12444 InsertionText += RD->getKindName();
12446 Diag(TypeRange.getBegin(),
12447 getLangOpts().CPlusPlus11 ?
12448 diag::warn_cxx98_compat_unelaborated_friend_type :
12449 diag::ext_unelaborated_friend_type)
12450 << (unsigned) RD->getTagKind()
12452 << FixItHint::CreateInsertion(getLocForEndOfToken(FriendLoc),
12456 getLangOpts().CPlusPlus11 ?
12457 diag::warn_cxx98_compat_nonclass_type_friend :
12458 diag::ext_nonclass_type_friend)
12462 } else if (T->getAs<EnumType>()) {
12464 getLangOpts().CPlusPlus11 ?
12465 diag::warn_cxx98_compat_enum_friend :
12466 diag::ext_enum_friend)
12471 // C++11 [class.friend]p3:
12472 // A friend declaration that does not declare a function shall have one
12473 // of the following forms:
12474 // friend elaborated-type-specifier ;
12475 // friend simple-type-specifier ;
12476 // friend typename-specifier ;
12477 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc)
12478 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T;
12481 // If the type specifier in a friend declaration designates a (possibly
12482 // cv-qualified) class type, that class is declared as a friend; otherwise,
12483 // the friend declaration is ignored.
12484 return FriendDecl::Create(Context, CurContext,
12485 TSInfo->getTypeLoc().getLocStart(), TSInfo,
12489 /// Handle a friend tag declaration where the scope specifier was
12491 Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc,
12492 unsigned TagSpec, SourceLocation TagLoc,
12494 IdentifierInfo *Name,
12495 SourceLocation NameLoc,
12496 AttributeList *Attr,
12497 MultiTemplateParamsArg TempParamLists) {
12498 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
12500 bool isExplicitSpecialization = false;
12501 bool Invalid = false;
12503 if (TemplateParameterList *TemplateParams =
12504 MatchTemplateParametersToScopeSpecifier(
12505 TagLoc, NameLoc, SS, nullptr, TempParamLists, /*friend*/ true,
12506 isExplicitSpecialization, Invalid)) {
12507 if (TemplateParams->size() > 0) {
12508 // This is a declaration of a class template.
12512 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, SS, Name,
12513 NameLoc, Attr, TemplateParams, AS_public,
12514 /*ModulePrivateLoc=*/SourceLocation(),
12515 FriendLoc, TempParamLists.size() - 1,
12516 TempParamLists.data()).get();
12518 // The "template<>" header is extraneous.
12519 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
12520 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
12521 isExplicitSpecialization = true;
12525 if (Invalid) return nullptr;
12527 bool isAllExplicitSpecializations = true;
12528 for (unsigned I = TempParamLists.size(); I-- > 0; ) {
12529 if (TempParamLists[I]->size()) {
12530 isAllExplicitSpecializations = false;
12535 // FIXME: don't ignore attributes.
12537 // If it's explicit specializations all the way down, just forget
12538 // about the template header and build an appropriate non-templated
12539 // friend. TODO: for source fidelity, remember the headers.
12540 if (isAllExplicitSpecializations) {
12541 if (SS.isEmpty()) {
12542 bool Owned = false;
12543 bool IsDependent = false;
12544 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc,
12546 /*ModulePrivateLoc=*/SourceLocation(),
12547 MultiTemplateParamsArg(), Owned, IsDependent,
12548 /*ScopedEnumKWLoc=*/SourceLocation(),
12549 /*ScopedEnumUsesClassTag=*/false,
12550 /*UnderlyingType=*/TypeResult(),
12551 /*IsTypeSpecifier=*/false);
12554 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
12555 ElaboratedTypeKeyword Keyword
12556 = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
12557 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc,
12562 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
12563 if (isa<DependentNameType>(T)) {
12564 DependentNameTypeLoc TL =
12565 TSI->getTypeLoc().castAs<DependentNameTypeLoc>();
12566 TL.setElaboratedKeywordLoc(TagLoc);
12567 TL.setQualifierLoc(QualifierLoc);
12568 TL.setNameLoc(NameLoc);
12570 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>();
12571 TL.setElaboratedKeywordLoc(TagLoc);
12572 TL.setQualifierLoc(QualifierLoc);
12573 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc);
12576 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
12577 TSI, FriendLoc, TempParamLists);
12578 Friend->setAccess(AS_public);
12579 CurContext->addDecl(Friend);
12583 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?");
12587 // Handle the case of a templated-scope friend class. e.g.
12588 // template <class T> class A<T>::B;
12589 // FIXME: we don't support these right now.
12590 Diag(NameLoc, diag::warn_template_qualified_friend_unsupported)
12591 << SS.getScopeRep() << SS.getRange() << cast<CXXRecordDecl>(CurContext);
12592 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
12593 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name);
12594 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
12595 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>();
12596 TL.setElaboratedKeywordLoc(TagLoc);
12597 TL.setQualifierLoc(SS.getWithLocInContext(Context));
12598 TL.setNameLoc(NameLoc);
12600 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc,
12601 TSI, FriendLoc, TempParamLists);
12602 Friend->setAccess(AS_public);
12603 Friend->setUnsupportedFriend(true);
12604 CurContext->addDecl(Friend);
12609 /// Handle a friend type declaration. This works in tandem with
12612 /// Notes on friend class templates:
12614 /// We generally treat friend class declarations as if they were
12615 /// declaring a class. So, for example, the elaborated type specifier
12616 /// in a friend declaration is required to obey the restrictions of a
12617 /// class-head (i.e. no typedefs in the scope chain), template
12618 /// parameters are required to match up with simple template-ids, &c.
12619 /// However, unlike when declaring a template specialization, it's
12620 /// okay to refer to a template specialization without an empty
12621 /// template parameter declaration, e.g.
12622 /// friend class A<T>::B<unsigned>;
12623 /// We permit this as a special case; if there are any template
12624 /// parameters present at all, require proper matching, i.e.
12625 /// template <> template \<class T> friend class A<int>::B;
12626 Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
12627 MultiTemplateParamsArg TempParams) {
12628 SourceLocation Loc = DS.getLocStart();
12630 assert(DS.isFriendSpecified());
12631 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
12633 // Try to convert the decl specifier to a type. This works for
12634 // friend templates because ActOnTag never produces a ClassTemplateDecl
12635 // for a TUK_Friend.
12636 Declarator TheDeclarator(DS, Declarator::MemberContext);
12637 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S);
12638 QualType T = TSI->getType();
12639 if (TheDeclarator.isInvalidType())
12642 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration))
12645 // This is definitely an error in C++98. It's probably meant to
12646 // be forbidden in C++0x, too, but the specification is just
12649 // The problem is with declarations like the following:
12650 // template <T> friend A<T>::foo;
12651 // where deciding whether a class C is a friend or not now hinges
12652 // on whether there exists an instantiation of A that causes
12653 // 'foo' to equal C. There are restrictions on class-heads
12654 // (which we declare (by fiat) elaborated friend declarations to
12655 // be) that makes this tractable.
12657 // FIXME: handle "template <> friend class A<T>;", which
12658 // is possibly well-formed? Who even knows?
12659 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) {
12660 Diag(Loc, diag::err_tagless_friend_type_template)
12661 << DS.getSourceRange();
12665 // C++98 [class.friend]p1: A friend of a class is a function
12666 // or class that is not a member of the class . . .
12667 // This is fixed in DR77, which just barely didn't make the C++03
12668 // deadline. It's also a very silly restriction that seriously
12669 // affects inner classes and which nobody else seems to implement;
12670 // thus we never diagnose it, not even in -pedantic.
12672 // But note that we could warn about it: it's always useless to
12673 // friend one of your own members (it's not, however, worthless to
12674 // friend a member of an arbitrary specialization of your template).
12677 if (!TempParams.empty())
12678 D = FriendTemplateDecl::Create(Context, CurContext, Loc,
12681 DS.getFriendSpecLoc());
12683 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI);
12688 D->setAccess(AS_public);
12689 CurContext->addDecl(D);
12694 NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D,
12695 MultiTemplateParamsArg TemplateParams) {
12696 const DeclSpec &DS = D.getDeclSpec();
12698 assert(DS.isFriendSpecified());
12699 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
12701 SourceLocation Loc = D.getIdentifierLoc();
12702 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
12704 // C++ [class.friend]p1
12705 // A friend of a class is a function or class....
12706 // Note that this sees through typedefs, which is intended.
12707 // It *doesn't* see through dependent types, which is correct
12708 // according to [temp.arg.type]p3:
12709 // If a declaration acquires a function type through a
12710 // type dependent on a template-parameter and this causes
12711 // a declaration that does not use the syntactic form of a
12712 // function declarator to have a function type, the program
12714 if (!TInfo->getType()->isFunctionType()) {
12715 Diag(Loc, diag::err_unexpected_friend);
12717 // It might be worthwhile to try to recover by creating an
12718 // appropriate declaration.
12722 // C++ [namespace.memdef]p3
12723 // - If a friend declaration in a non-local class first declares a
12724 // class or function, the friend class or function is a member
12725 // of the innermost enclosing namespace.
12726 // - The name of the friend is not found by simple name lookup
12727 // until a matching declaration is provided in that namespace
12728 // scope (either before or after the class declaration granting
12730 // - If a friend function is called, its name may be found by the
12731 // name lookup that considers functions from namespaces and
12732 // classes associated with the types of the function arguments.
12733 // - When looking for a prior declaration of a class or a function
12734 // declared as a friend, scopes outside the innermost enclosing
12735 // namespace scope are not considered.
12737 CXXScopeSpec &SS = D.getCXXScopeSpec();
12738 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
12739 DeclarationName Name = NameInfo.getName();
12742 // Check for unexpanded parameter packs.
12743 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) ||
12744 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) ||
12745 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration))
12748 // The context we found the declaration in, or in which we should
12749 // create the declaration.
12751 Scope *DCScope = S;
12752 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
12755 // There are five cases here.
12756 // - There's no scope specifier and we're in a local class. Only look
12757 // for functions declared in the immediately-enclosing block scope.
12758 // We recover from invalid scope qualifiers as if they just weren't there.
12759 FunctionDecl *FunctionContainingLocalClass = nullptr;
12760 if ((SS.isInvalid() || !SS.isSet()) &&
12761 (FunctionContainingLocalClass =
12762 cast<CXXRecordDecl>(CurContext)->isLocalClass())) {
12763 // C++11 [class.friend]p11:
12764 // If a friend declaration appears in a local class and the name
12765 // specified is an unqualified name, a prior declaration is
12766 // looked up without considering scopes that are outside the
12767 // innermost enclosing non-class scope. For a friend function
12768 // declaration, if there is no prior declaration, the program is
12771 // Find the innermost enclosing non-class scope. This is the block
12772 // scope containing the local class definition (or for a nested class,
12773 // the outer local class).
12774 DCScope = S->getFnParent();
12776 // Look up the function name in the scope.
12777 Previous.clear(LookupLocalFriendName);
12778 LookupName(Previous, S, /*AllowBuiltinCreation*/false);
12780 if (!Previous.empty()) {
12781 // All possible previous declarations must have the same context:
12782 // either they were declared at block scope or they are members of
12783 // one of the enclosing local classes.
12784 DC = Previous.getRepresentativeDecl()->getDeclContext();
12786 // This is ill-formed, but provide the context that we would have
12787 // declared the function in, if we were permitted to, for error recovery.
12788 DC = FunctionContainingLocalClass;
12790 adjustContextForLocalExternDecl(DC);
12792 // C++ [class.friend]p6:
12793 // A function can be defined in a friend declaration of a class if and
12794 // only if the class is a non-local class (9.8), the function name is
12795 // unqualified, and the function has namespace scope.
12796 if (D.isFunctionDefinition()) {
12797 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class);
12800 // - There's no scope specifier, in which case we just go to the
12801 // appropriate scope and look for a function or function template
12802 // there as appropriate.
12803 } else if (SS.isInvalid() || !SS.isSet()) {
12804 // C++11 [namespace.memdef]p3:
12805 // If the name in a friend declaration is neither qualified nor
12806 // a template-id and the declaration is a function or an
12807 // elaborated-type-specifier, the lookup to determine whether
12808 // the entity has been previously declared shall not consider
12809 // any scopes outside the innermost enclosing namespace.
12810 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId;
12812 // Find the appropriate context according to the above.
12815 // Skip class contexts. If someone can cite chapter and verse
12816 // for this behavior, that would be nice --- it's what GCC and
12817 // EDG do, and it seems like a reasonable intent, but the spec
12818 // really only says that checks for unqualified existing
12819 // declarations should stop at the nearest enclosing namespace,
12820 // not that they should only consider the nearest enclosing
12822 while (DC->isRecord())
12823 DC = DC->getParent();
12825 DeclContext *LookupDC = DC;
12826 while (LookupDC->isTransparentContext())
12827 LookupDC = LookupDC->getParent();
12830 LookupQualifiedName(Previous, LookupDC);
12832 if (!Previous.empty()) {
12837 if (isTemplateId) {
12838 if (isa<TranslationUnitDecl>(LookupDC)) break;
12840 if (LookupDC->isFileContext()) break;
12842 LookupDC = LookupDC->getParent();
12845 DCScope = getScopeForDeclContext(S, DC);
12847 // - There's a non-dependent scope specifier, in which case we
12848 // compute it and do a previous lookup there for a function
12849 // or function template.
12850 } else if (!SS.getScopeRep()->isDependent()) {
12851 DC = computeDeclContext(SS);
12852 if (!DC) return nullptr;
12854 if (RequireCompleteDeclContext(SS, DC)) return nullptr;
12856 LookupQualifiedName(Previous, DC);
12858 // Ignore things found implicitly in the wrong scope.
12859 // TODO: better diagnostics for this case. Suggesting the right
12860 // qualified scope would be nice...
12861 LookupResult::Filter F = Previous.makeFilter();
12862 while (F.hasNext()) {
12863 NamedDecl *D = F.next();
12864 if (!DC->InEnclosingNamespaceSetOf(
12865 D->getDeclContext()->getRedeclContext()))
12870 if (Previous.empty()) {
12871 D.setInvalidType();
12872 Diag(Loc, diag::err_qualified_friend_not_found)
12873 << Name << TInfo->getType();
12877 // C++ [class.friend]p1: A friend of a class is a function or
12878 // class that is not a member of the class . . .
12879 if (DC->Equals(CurContext))
12880 Diag(DS.getFriendSpecLoc(),
12881 getLangOpts().CPlusPlus11 ?
12882 diag::warn_cxx98_compat_friend_is_member :
12883 diag::err_friend_is_member);
12885 if (D.isFunctionDefinition()) {
12886 // C++ [class.friend]p6:
12887 // A function can be defined in a friend declaration of a class if and
12888 // only if the class is a non-local class (9.8), the function name is
12889 // unqualified, and the function has namespace scope.
12890 SemaDiagnosticBuilder DB
12891 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def);
12893 DB << SS.getScopeRep();
12894 if (DC->isFileContext())
12895 DB << FixItHint::CreateRemoval(SS.getRange());
12899 // - There's a scope specifier that does not match any template
12900 // parameter lists, in which case we use some arbitrary context,
12901 // create a method or method template, and wait for instantiation.
12902 // - There's a scope specifier that does match some template
12903 // parameter lists, which we don't handle right now.
12905 if (D.isFunctionDefinition()) {
12906 // C++ [class.friend]p6:
12907 // A function can be defined in a friend declaration of a class if and
12908 // only if the class is a non-local class (9.8), the function name is
12909 // unqualified, and the function has namespace scope.
12910 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def)
12911 << SS.getScopeRep();
12915 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?");
12918 if (!DC->isRecord()) {
12920 switch (D.getName().getKind()) {
12921 case UnqualifiedId::IK_ConstructorTemplateId:
12922 case UnqualifiedId::IK_ConstructorName:
12925 case UnqualifiedId::IK_DestructorName:
12928 case UnqualifiedId::IK_ConversionFunctionId:
12931 case UnqualifiedId::IK_Identifier:
12932 case UnqualifiedId::IK_ImplicitSelfParam:
12933 case UnqualifiedId::IK_LiteralOperatorId:
12934 case UnqualifiedId::IK_OperatorFunctionId:
12935 case UnqualifiedId::IK_TemplateId:
12938 // This implies that it has to be an operator or function.
12939 if (DiagArg >= 0) {
12940 Diag(Loc, diag::err_introducing_special_friend) << DiagArg;
12945 // FIXME: This is an egregious hack to cope with cases where the scope stack
12946 // does not contain the declaration context, i.e., in an out-of-line
12947 // definition of a class.
12948 Scope FakeDCScope(S, Scope::DeclScope, Diags);
12950 FakeDCScope.setEntity(DC);
12951 DCScope = &FakeDCScope;
12954 bool AddToScope = true;
12955 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous,
12956 TemplateParams, AddToScope);
12957 if (!ND) return nullptr;
12959 assert(ND->getLexicalDeclContext() == CurContext);
12961 // If we performed typo correction, we might have added a scope specifier
12962 // and changed the decl context.
12963 DC = ND->getDeclContext();
12965 // Add the function declaration to the appropriate lookup tables,
12966 // adjusting the redeclarations list as necessary. We don't
12967 // want to do this yet if the friending class is dependent.
12969 // Also update the scope-based lookup if the target context's
12970 // lookup context is in lexical scope.
12971 if (!CurContext->isDependentContext()) {
12972 DC = DC->getRedeclContext();
12973 DC->makeDeclVisibleInContext(ND);
12974 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
12975 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false);
12978 FriendDecl *FrD = FriendDecl::Create(Context, CurContext,
12979 D.getIdentifierLoc(), ND,
12980 DS.getFriendSpecLoc());
12981 FrD->setAccess(AS_public);
12982 CurContext->addDecl(FrD);
12984 if (ND->isInvalidDecl()) {
12985 FrD->setInvalidDecl();
12987 if (DC->isRecord()) CheckFriendAccess(ND);
12990 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND))
12991 FD = FTD->getTemplatedDecl();
12993 FD = cast<FunctionDecl>(ND);
12995 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a
12996 // default argument expression, that declaration shall be a definition
12997 // and shall be the only declaration of the function or function
12998 // template in the translation unit.
12999 if (functionDeclHasDefaultArgument(FD)) {
13000 if (FunctionDecl *OldFD = FD->getPreviousDecl()) {
13001 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_redeclared);
13002 Diag(OldFD->getLocation(), diag::note_previous_declaration);
13003 } else if (!D.isFunctionDefinition())
13004 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_must_be_def);
13007 // Mark templated-scope function declarations as unsupported.
13008 if (FD->getNumTemplateParameterLists() && SS.isValid()) {
13009 Diag(FD->getLocation(), diag::warn_template_qualified_friend_unsupported)
13010 << SS.getScopeRep() << SS.getRange()
13011 << cast<CXXRecordDecl>(CurContext);
13012 FrD->setUnsupportedFriend(true);
13019 void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) {
13020 AdjustDeclIfTemplate(Dcl);
13022 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl);
13024 Diag(DelLoc, diag::err_deleted_non_function);
13028 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) {
13029 // Don't consider the implicit declaration we generate for explicit
13030 // specializations. FIXME: Do not generate these implicit declarations.
13031 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization ||
13032 Prev->getPreviousDecl()) &&
13033 !Prev->isDefined()) {
13034 Diag(DelLoc, diag::err_deleted_decl_not_first);
13035 Diag(Prev->getLocation().isInvalid() ? DelLoc : Prev->getLocation(),
13036 Prev->isImplicit() ? diag::note_previous_implicit_declaration
13037 : diag::note_previous_declaration);
13039 // If the declaration wasn't the first, we delete the function anyway for
13041 Fn = Fn->getCanonicalDecl();
13044 // dllimport/dllexport cannot be deleted.
13045 if (const InheritableAttr *DLLAttr = getDLLAttr(Fn)) {
13046 Diag(Fn->getLocation(), diag::err_attribute_dll_deleted) << DLLAttr;
13047 Fn->setInvalidDecl();
13050 if (Fn->isDeleted())
13053 // See if we're deleting a function which is already known to override a
13054 // non-deleted virtual function.
13055 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) {
13056 bool IssuedDiagnostic = false;
13057 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
13058 E = MD->end_overridden_methods();
13060 if (!(*MD->begin_overridden_methods())->isDeleted()) {
13061 if (!IssuedDiagnostic) {
13062 Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName();
13063 IssuedDiagnostic = true;
13065 Diag((*I)->getLocation(), diag::note_overridden_virtual_function);
13070 // C++11 [basic.start.main]p3:
13071 // A program that defines main as deleted [...] is ill-formed.
13073 Diag(DelLoc, diag::err_deleted_main);
13075 Fn->setDeletedAsWritten();
13078 void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) {
13079 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl);
13082 if (MD->getParent()->isDependentType()) {
13083 MD->setDefaulted();
13084 MD->setExplicitlyDefaulted();
13088 CXXSpecialMember Member = getSpecialMember(MD);
13089 if (Member == CXXInvalid) {
13090 if (!MD->isInvalidDecl())
13091 Diag(DefaultLoc, diag::err_default_special_members);
13095 MD->setDefaulted();
13096 MD->setExplicitlyDefaulted();
13098 // If this definition appears within the record, do the checking when
13099 // the record is complete.
13100 const FunctionDecl *Primary = MD;
13101 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern())
13102 // Ask the template instantiation pattern that actually had the
13103 // '= default' on it.
13106 // If the method was defaulted on its first declaration, we will have
13107 // already performed the checking in CheckCompletedCXXClass. Such a
13108 // declaration doesn't trigger an implicit definition.
13109 if (Primary->getCanonicalDecl()->isDefaulted())
13112 CheckExplicitlyDefaultedSpecialMember(MD);
13114 if (!MD->isInvalidDecl())
13115 DefineImplicitSpecialMember(*this, MD, DefaultLoc);
13117 Diag(DefaultLoc, diag::err_default_special_members);
13121 static void SearchForReturnInStmt(Sema &Self, Stmt *S) {
13122 for (Stmt *SubStmt : S->children()) {
13125 if (isa<ReturnStmt>(SubStmt))
13126 Self.Diag(SubStmt->getLocStart(),
13127 diag::err_return_in_constructor_handler);
13128 if (!isa<Expr>(SubStmt))
13129 SearchForReturnInStmt(Self, SubStmt);
13133 void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) {
13134 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) {
13135 CXXCatchStmt *Handler = TryBlock->getHandler(I);
13136 SearchForReturnInStmt(*this, Handler);
13140 bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New,
13141 const CXXMethodDecl *Old) {
13142 const FunctionType *NewFT = New->getType()->getAs<FunctionType>();
13143 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>();
13145 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv();
13147 // If the calling conventions match, everything is fine
13148 if (NewCC == OldCC)
13151 // If the calling conventions mismatch because the new function is static,
13152 // suppress the calling convention mismatch error; the error about static
13153 // function override (err_static_overrides_virtual from
13154 // Sema::CheckFunctionDeclaration) is more clear.
13155 if (New->getStorageClass() == SC_Static)
13158 Diag(New->getLocation(),
13159 diag::err_conflicting_overriding_cc_attributes)
13160 << New->getDeclName() << New->getType() << Old->getType();
13161 Diag(Old->getLocation(), diag::note_overridden_virtual_function);
13165 bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
13166 const CXXMethodDecl *Old) {
13167 QualType NewTy = New->getType()->getAs<FunctionType>()->getReturnType();
13168 QualType OldTy = Old->getType()->getAs<FunctionType>()->getReturnType();
13170 if (Context.hasSameType(NewTy, OldTy) ||
13171 NewTy->isDependentType() || OldTy->isDependentType())
13174 // Check if the return types are covariant
13175 QualType NewClassTy, OldClassTy;
13177 /// Both types must be pointers or references to classes.
13178 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) {
13179 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) {
13180 NewClassTy = NewPT->getPointeeType();
13181 OldClassTy = OldPT->getPointeeType();
13183 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) {
13184 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) {
13185 if (NewRT->getTypeClass() == OldRT->getTypeClass()) {
13186 NewClassTy = NewRT->getPointeeType();
13187 OldClassTy = OldRT->getPointeeType();
13192 // The return types aren't either both pointers or references to a class type.
13193 if (NewClassTy.isNull()) {
13194 Diag(New->getLocation(),
13195 diag::err_different_return_type_for_overriding_virtual_function)
13196 << New->getDeclName() << NewTy << OldTy
13197 << New->getReturnTypeSourceRange();
13198 Diag(Old->getLocation(), diag::note_overridden_virtual_function)
13199 << Old->getReturnTypeSourceRange();
13204 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) {
13205 // C++14 [class.virtual]p8:
13206 // If the class type in the covariant return type of D::f differs from
13207 // that of B::f, the class type in the return type of D::f shall be
13208 // complete at the point of declaration of D::f or shall be the class
13210 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) {
13211 if (!RT->isBeingDefined() &&
13212 RequireCompleteType(New->getLocation(), NewClassTy,
13213 diag::err_covariant_return_incomplete,
13214 New->getDeclName()))
13218 // Check if the new class derives from the old class.
13219 if (!IsDerivedFrom(New->getLocation(), NewClassTy, OldClassTy)) {
13220 Diag(New->getLocation(), diag::err_covariant_return_not_derived)
13221 << New->getDeclName() << NewTy << OldTy
13222 << New->getReturnTypeSourceRange();
13223 Diag(Old->getLocation(), diag::note_overridden_virtual_function)
13224 << Old->getReturnTypeSourceRange();
13228 // Check if we the conversion from derived to base is valid.
13229 if (CheckDerivedToBaseConversion(
13230 NewClassTy, OldClassTy,
13231 diag::err_covariant_return_inaccessible_base,
13232 diag::err_covariant_return_ambiguous_derived_to_base_conv,
13233 New->getLocation(), New->getReturnTypeSourceRange(),
13234 New->getDeclName(), nullptr)) {
13235 // FIXME: this note won't trigger for delayed access control
13236 // diagnostics, and it's impossible to get an undelayed error
13237 // here from access control during the original parse because
13238 // the ParsingDeclSpec/ParsingDeclarator are still in scope.
13239 Diag(Old->getLocation(), diag::note_overridden_virtual_function)
13240 << Old->getReturnTypeSourceRange();
13245 // The qualifiers of the return types must be the same.
13246 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) {
13247 Diag(New->getLocation(),
13248 diag::err_covariant_return_type_different_qualifications)
13249 << New->getDeclName() << NewTy << OldTy
13250 << New->getReturnTypeSourceRange();
13251 Diag(Old->getLocation(), diag::note_overridden_virtual_function)
13252 << Old->getReturnTypeSourceRange();
13257 // The new class type must have the same or less qualifiers as the old type.
13258 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) {
13259 Diag(New->getLocation(),
13260 diag::err_covariant_return_type_class_type_more_qualified)
13261 << New->getDeclName() << NewTy << OldTy
13262 << New->getReturnTypeSourceRange();
13263 Diag(Old->getLocation(), diag::note_overridden_virtual_function)
13264 << Old->getReturnTypeSourceRange();
13271 /// \brief Mark the given method pure.
13273 /// \param Method the method to be marked pure.
13275 /// \param InitRange the source range that covers the "0" initializer.
13276 bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) {
13277 SourceLocation EndLoc = InitRange.getEnd();
13278 if (EndLoc.isValid())
13279 Method->setRangeEnd(EndLoc);
13281 if (Method->isVirtual() || Method->getParent()->isDependentContext()) {
13286 if (!Method->isInvalidDecl())
13287 Diag(Method->getLocation(), diag::err_non_virtual_pure)
13288 << Method->getDeclName() << InitRange;
13292 void Sema::ActOnPureSpecifier(Decl *D, SourceLocation ZeroLoc) {
13293 if (D->getFriendObjectKind())
13294 Diag(D->getLocation(), diag::err_pure_friend);
13295 else if (auto *M = dyn_cast<CXXMethodDecl>(D))
13296 CheckPureMethod(M, ZeroLoc);
13298 Diag(D->getLocation(), diag::err_illegal_initializer);
13301 /// \brief Determine whether the given declaration is a static data member.
13302 static bool isStaticDataMember(const Decl *D) {
13303 if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(D))
13304 return Var->isStaticDataMember();
13309 /// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse
13310 /// an initializer for the out-of-line declaration 'Dcl'. The scope
13311 /// is a fresh scope pushed for just this purpose.
13313 /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
13314 /// static data member of class X, names should be looked up in the scope of
13316 void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) {
13317 // If there is no declaration, there was an error parsing it.
13318 if (!D || D->isInvalidDecl())
13321 // We will always have a nested name specifier here, but this declaration
13322 // might not be out of line if the specifier names the current namespace:
13325 if (D->isOutOfLine())
13326 EnterDeclaratorContext(S, D->getDeclContext());
13328 // If we are parsing the initializer for a static data member, push a
13329 // new expression evaluation context that is associated with this static
13331 if (isStaticDataMember(D))
13332 PushExpressionEvaluationContext(PotentiallyEvaluated, D);
13335 /// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an
13336 /// initializer for the out-of-line declaration 'D'.
13337 void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) {
13338 // If there is no declaration, there was an error parsing it.
13339 if (!D || D->isInvalidDecl())
13342 if (isStaticDataMember(D))
13343 PopExpressionEvaluationContext();
13345 if (D->isOutOfLine())
13346 ExitDeclaratorContext(S);
13349 /// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a
13350 /// C++ if/switch/while/for statement.
13351 /// e.g: "if (int x = f()) {...}"
13352 DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) {
13354 // The declarator shall not specify a function or an array.
13355 // The type-specifier-seq shall not contain typedef and shall not declare a
13356 // new class or enumeration.
13357 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
13358 "Parser allowed 'typedef' as storage class of condition decl.");
13360 Decl *Dcl = ActOnDeclarator(S, D);
13364 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function.
13365 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type)
13366 << D.getSourceRange();
13373 void Sema::LoadExternalVTableUses() {
13374 if (!ExternalSource)
13377 SmallVector<ExternalVTableUse, 4> VTables;
13378 ExternalSource->ReadUsedVTables(VTables);
13379 SmallVector<VTableUse, 4> NewUses;
13380 for (unsigned I = 0, N = VTables.size(); I != N; ++I) {
13381 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos
13382 = VTablesUsed.find(VTables[I].Record);
13383 // Even if a definition wasn't required before, it may be required now.
13384 if (Pos != VTablesUsed.end()) {
13385 if (!Pos->second && VTables[I].DefinitionRequired)
13386 Pos->second = true;
13390 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired;
13391 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location));
13394 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end());
13397 void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class,
13398 bool DefinitionRequired) {
13399 // Ignore any vtable uses in unevaluated operands or for classes that do
13400 // not have a vtable.
13401 if (!Class->isDynamicClass() || Class->isDependentContext() ||
13402 CurContext->isDependentContext() || isUnevaluatedContext())
13405 // Try to insert this class into the map.
13406 LoadExternalVTableUses();
13407 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl());
13408 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool>
13409 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired));
13411 // If we already had an entry, check to see if we are promoting this vtable
13412 // to require a definition. If so, we need to reappend to the VTableUses
13413 // list, since we may have already processed the first entry.
13414 if (DefinitionRequired && !Pos.first->second) {
13415 Pos.first->second = true;
13417 // Otherwise, we can early exit.
13421 // The Microsoft ABI requires that we perform the destructor body
13422 // checks (i.e. operator delete() lookup) when the vtable is marked used, as
13423 // the deleting destructor is emitted with the vtable, not with the
13424 // destructor definition as in the Itanium ABI.
13425 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
13426 CXXDestructorDecl *DD = Class->getDestructor();
13427 if (DD && DD->isVirtual() && !DD->isDeleted()) {
13428 if (Class->hasUserDeclaredDestructor() && !DD->isDefined()) {
13429 // If this is an out-of-line declaration, marking it referenced will
13430 // not do anything. Manually call CheckDestructor to look up operator
13432 ContextRAII SavedContext(*this, DD);
13433 CheckDestructor(DD);
13435 MarkFunctionReferenced(Loc, Class->getDestructor());
13441 // Local classes need to have their virtual members marked
13442 // immediately. For all other classes, we mark their virtual members
13443 // at the end of the translation unit.
13444 if (Class->isLocalClass())
13445 MarkVirtualMembersReferenced(Loc, Class);
13447 VTableUses.push_back(std::make_pair(Class, Loc));
13450 bool Sema::DefineUsedVTables() {
13451 LoadExternalVTableUses();
13452 if (VTableUses.empty())
13455 // Note: The VTableUses vector could grow as a result of marking
13456 // the members of a class as "used", so we check the size each
13457 // time through the loop and prefer indices (which are stable) to
13458 // iterators (which are not).
13459 bool DefinedAnything = false;
13460 for (unsigned I = 0; I != VTableUses.size(); ++I) {
13461 CXXRecordDecl *Class = VTableUses[I].first->getDefinition();
13465 SourceLocation Loc = VTableUses[I].second;
13467 bool DefineVTable = true;
13469 // If this class has a key function, but that key function is
13470 // defined in another translation unit, we don't need to emit the
13471 // vtable even though we're using it.
13472 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class);
13473 if (KeyFunction && !KeyFunction->hasBody()) {
13474 // The key function is in another translation unit.
13475 DefineVTable = false;
13476 TemplateSpecializationKind TSK =
13477 KeyFunction->getTemplateSpecializationKind();
13478 assert(TSK != TSK_ExplicitInstantiationDefinition &&
13479 TSK != TSK_ImplicitInstantiation &&
13480 "Instantiations don't have key functions");
13482 } else if (!KeyFunction) {
13483 // If we have a class with no key function that is the subject
13484 // of an explicit instantiation declaration, suppress the
13485 // vtable; it will live with the explicit instantiation
13487 bool IsExplicitInstantiationDeclaration
13488 = Class->getTemplateSpecializationKind()
13489 == TSK_ExplicitInstantiationDeclaration;
13490 for (auto R : Class->redecls()) {
13491 TemplateSpecializationKind TSK
13492 = cast<CXXRecordDecl>(R)->getTemplateSpecializationKind();
13493 if (TSK == TSK_ExplicitInstantiationDeclaration)
13494 IsExplicitInstantiationDeclaration = true;
13495 else if (TSK == TSK_ExplicitInstantiationDefinition) {
13496 IsExplicitInstantiationDeclaration = false;
13501 if (IsExplicitInstantiationDeclaration)
13502 DefineVTable = false;
13505 // The exception specifications for all virtual members may be needed even
13506 // if we are not providing an authoritative form of the vtable in this TU.
13507 // We may choose to emit it available_externally anyway.
13508 if (!DefineVTable) {
13509 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class);
13513 // Mark all of the virtual members of this class as referenced, so
13514 // that we can build a vtable. Then, tell the AST consumer that a
13515 // vtable for this class is required.
13516 DefinedAnything = true;
13517 MarkVirtualMembersReferenced(Loc, Class);
13518 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl());
13519 if (VTablesUsed[Canonical])
13520 Consumer.HandleVTable(Class);
13522 // Optionally warn if we're emitting a weak vtable.
13523 if (Class->isExternallyVisible() &&
13524 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) {
13525 const FunctionDecl *KeyFunctionDef = nullptr;
13526 if (!KeyFunction ||
13527 (KeyFunction->hasBody(KeyFunctionDef) &&
13528 KeyFunctionDef->isInlined()))
13529 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() ==
13530 TSK_ExplicitInstantiationDefinition
13531 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable)
13535 VTableUses.clear();
13537 return DefinedAnything;
13540 void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc,
13541 const CXXRecordDecl *RD) {
13542 for (const auto *I : RD->methods())
13543 if (I->isVirtual() && !I->isPure())
13544 ResolveExceptionSpec(Loc, I->getType()->castAs<FunctionProtoType>());
13547 void Sema::MarkVirtualMembersReferenced(SourceLocation Loc,
13548 const CXXRecordDecl *RD) {
13549 // Mark all functions which will appear in RD's vtable as used.
13550 CXXFinalOverriderMap FinalOverriders;
13551 RD->getFinalOverriders(FinalOverriders);
13552 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(),
13553 E = FinalOverriders.end();
13555 for (OverridingMethods::const_iterator OI = I->second.begin(),
13556 OE = I->second.end();
13558 assert(OI->second.size() > 0 && "no final overrider");
13559 CXXMethodDecl *Overrider = OI->second.front().Method;
13561 // C++ [basic.def.odr]p2:
13562 // [...] A virtual member function is used if it is not pure. [...]
13563 if (!Overrider->isPure())
13564 MarkFunctionReferenced(Loc, Overrider);
13568 // Only classes that have virtual bases need a VTT.
13569 if (RD->getNumVBases() == 0)
13572 for (const auto &I : RD->bases()) {
13573 const CXXRecordDecl *Base =
13574 cast<CXXRecordDecl>(I.getType()->getAs<RecordType>()->getDecl());
13575 if (Base->getNumVBases() == 0)
13577 MarkVirtualMembersReferenced(Loc, Base);
13581 /// SetIvarInitializers - This routine builds initialization ASTs for the
13582 /// Objective-C implementation whose ivars need be initialized.
13583 void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) {
13584 if (!getLangOpts().CPlusPlus)
13586 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) {
13587 SmallVector<ObjCIvarDecl*, 8> ivars;
13588 CollectIvarsToConstructOrDestruct(OID, ivars);
13591 SmallVector<CXXCtorInitializer*, 32> AllToInit;
13592 for (unsigned i = 0; i < ivars.size(); i++) {
13593 FieldDecl *Field = ivars[i];
13594 if (Field->isInvalidDecl())
13597 CXXCtorInitializer *Member;
13598 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field);
13599 InitializationKind InitKind =
13600 InitializationKind::CreateDefault(ObjCImplementation->getLocation());
13602 InitializationSequence InitSeq(*this, InitEntity, InitKind, None);
13603 ExprResult MemberInit =
13604 InitSeq.Perform(*this, InitEntity, InitKind, None);
13605 MemberInit = MaybeCreateExprWithCleanups(MemberInit);
13606 // Note, MemberInit could actually come back empty if no initialization
13607 // is required (e.g., because it would call a trivial default constructor)
13608 if (!MemberInit.get() || MemberInit.isInvalid())
13612 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(),
13614 MemberInit.getAs<Expr>(),
13616 AllToInit.push_back(Member);
13618 // Be sure that the destructor is accessible and is marked as referenced.
13619 if (const RecordType *RecordTy =
13620 Context.getBaseElementType(Field->getType())
13621 ->getAs<RecordType>()) {
13622 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl());
13623 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) {
13624 MarkFunctionReferenced(Field->getLocation(), Destructor);
13625 CheckDestructorAccess(Field->getLocation(), Destructor,
13626 PDiag(diag::err_access_dtor_ivar)
13627 << Context.getBaseElementType(Field->getType()));
13631 ObjCImplementation->setIvarInitializers(Context,
13632 AllToInit.data(), AllToInit.size());
13637 void DelegatingCycleHelper(CXXConstructorDecl* Ctor,
13638 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid,
13639 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid,
13640 llvm::SmallSet<CXXConstructorDecl*, 4> &Current,
13642 if (Ctor->isInvalidDecl())
13645 CXXConstructorDecl *Target = Ctor->getTargetConstructor();
13647 // Target may not be determinable yet, for instance if this is a dependent
13648 // call in an uninstantiated template.
13650 const FunctionDecl *FNTarget = nullptr;
13651 (void)Target->hasBody(FNTarget);
13652 Target = const_cast<CXXConstructorDecl*>(
13653 cast_or_null<CXXConstructorDecl>(FNTarget));
13656 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(),
13657 // Avoid dereferencing a null pointer here.
13658 *TCanonical = Target? Target->getCanonicalDecl() : nullptr;
13660 if (!Current.insert(Canonical).second)
13663 // We know that beyond here, we aren't chaining into a cycle.
13664 if (!Target || !Target->isDelegatingConstructor() ||
13665 Target->isInvalidDecl() || Valid.count(TCanonical)) {
13666 Valid.insert(Current.begin(), Current.end());
13668 // We've hit a cycle.
13669 } else if (TCanonical == Canonical || Invalid.count(TCanonical) ||
13670 Current.count(TCanonical)) {
13671 // If we haven't diagnosed this cycle yet, do so now.
13672 if (!Invalid.count(TCanonical)) {
13673 S.Diag((*Ctor->init_begin())->getSourceLocation(),
13674 diag::warn_delegating_ctor_cycle)
13677 // Don't add a note for a function delegating directly to itself.
13678 if (TCanonical != Canonical)
13679 S.Diag(Target->getLocation(), diag::note_it_delegates_to);
13681 CXXConstructorDecl *C = Target;
13682 while (C->getCanonicalDecl() != Canonical) {
13683 const FunctionDecl *FNTarget = nullptr;
13684 (void)C->getTargetConstructor()->hasBody(FNTarget);
13685 assert(FNTarget && "Ctor cycle through bodiless function");
13687 C = const_cast<CXXConstructorDecl*>(
13688 cast<CXXConstructorDecl>(FNTarget));
13689 S.Diag(C->getLocation(), diag::note_which_delegates_to);
13693 Invalid.insert(Current.begin(), Current.end());
13696 DelegatingCycleHelper(Target, Valid, Invalid, Current, S);
13701 void Sema::CheckDelegatingCtorCycles() {
13702 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current;
13704 for (DelegatingCtorDeclsType::iterator
13705 I = DelegatingCtorDecls.begin(ExternalSource),
13706 E = DelegatingCtorDecls.end();
13708 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this);
13710 for (llvm::SmallSet<CXXConstructorDecl *, 4>::iterator CI = Invalid.begin(),
13711 CE = Invalid.end();
13713 (*CI)->setInvalidDecl();
13717 /// \brief AST visitor that finds references to the 'this' expression.
13718 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> {
13722 explicit FindCXXThisExpr(Sema &S) : S(S) { }
13724 bool VisitCXXThisExpr(CXXThisExpr *E) {
13725 S.Diag(E->getLocation(), diag::err_this_static_member_func)
13726 << E->isImplicit();
13732 bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) {
13733 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
13737 TypeLoc TL = TSInfo->getTypeLoc();
13738 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>();
13742 // C++11 [expr.prim.general]p3:
13743 // [The expression this] shall not appear before the optional
13744 // cv-qualifier-seq and it shall not appear within the declaration of a
13745 // static member function (although its type and value category are defined
13746 // within a static member function as they are within a non-static member
13747 // function). [ Note: this is because declaration matching does not occur
13748 // until the complete declarator is known. - end note ]
13749 const FunctionProtoType *Proto = ProtoTL.getTypePtr();
13750 FindCXXThisExpr Finder(*this);
13752 // If the return type came after the cv-qualifier-seq, check it now.
13753 if (Proto->hasTrailingReturn() &&
13754 !Finder.TraverseTypeLoc(ProtoTL.getReturnLoc()))
13757 // Check the exception specification.
13758 if (checkThisInStaticMemberFunctionExceptionSpec(Method))
13761 return checkThisInStaticMemberFunctionAttributes(Method);
13764 bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) {
13765 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo();
13769 TypeLoc TL = TSInfo->getTypeLoc();
13770 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>();
13774 const FunctionProtoType *Proto = ProtoTL.getTypePtr();
13775 FindCXXThisExpr Finder(*this);
13777 switch (Proto->getExceptionSpecType()) {
13779 case EST_Uninstantiated:
13780 case EST_Unevaluated:
13781 case EST_BasicNoexcept:
13782 case EST_DynamicNone:
13787 case EST_ComputedNoexcept:
13788 if (!Finder.TraverseStmt(Proto->getNoexceptExpr()))
13792 for (const auto &E : Proto->exceptions()) {
13793 if (!Finder.TraverseType(E))
13802 bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) {
13803 FindCXXThisExpr Finder(*this);
13805 // Check attributes.
13806 for (const auto *A : Method->attrs()) {
13807 // FIXME: This should be emitted by tblgen.
13808 Expr *Arg = nullptr;
13809 ArrayRef<Expr *> Args;
13810 if (const auto *G = dyn_cast<GuardedByAttr>(A))
13812 else if (const auto *G = dyn_cast<PtGuardedByAttr>(A))
13814 else if (const auto *AA = dyn_cast<AcquiredAfterAttr>(A))
13815 Args = llvm::makeArrayRef(AA->args_begin(), AA->args_size());
13816 else if (const auto *AB = dyn_cast<AcquiredBeforeAttr>(A))
13817 Args = llvm::makeArrayRef(AB->args_begin(), AB->args_size());
13818 else if (const auto *ETLF = dyn_cast<ExclusiveTrylockFunctionAttr>(A)) {
13819 Arg = ETLF->getSuccessValue();
13820 Args = llvm::makeArrayRef(ETLF->args_begin(), ETLF->args_size());
13821 } else if (const auto *STLF = dyn_cast<SharedTrylockFunctionAttr>(A)) {
13822 Arg = STLF->getSuccessValue();
13823 Args = llvm::makeArrayRef(STLF->args_begin(), STLF->args_size());
13824 } else if (const auto *LR = dyn_cast<LockReturnedAttr>(A))
13825 Arg = LR->getArg();
13826 else if (const auto *LE = dyn_cast<LocksExcludedAttr>(A))
13827 Args = llvm::makeArrayRef(LE->args_begin(), LE->args_size());
13828 else if (const auto *RC = dyn_cast<RequiresCapabilityAttr>(A))
13829 Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size());
13830 else if (const auto *AC = dyn_cast<AcquireCapabilityAttr>(A))
13831 Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size());
13832 else if (const auto *AC = dyn_cast<TryAcquireCapabilityAttr>(A))
13833 Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size());
13834 else if (const auto *RC = dyn_cast<ReleaseCapabilityAttr>(A))
13835 Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size());
13837 if (Arg && !Finder.TraverseStmt(Arg))
13840 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
13841 if (!Finder.TraverseStmt(Args[I]))
13849 void Sema::checkExceptionSpecification(
13850 bool IsTopLevel, ExceptionSpecificationType EST,
13851 ArrayRef<ParsedType> DynamicExceptions,
13852 ArrayRef<SourceRange> DynamicExceptionRanges, Expr *NoexceptExpr,
13853 SmallVectorImpl<QualType> &Exceptions,
13854 FunctionProtoType::ExceptionSpecInfo &ESI) {
13855 Exceptions.clear();
13857 if (EST == EST_Dynamic) {
13858 Exceptions.reserve(DynamicExceptions.size());
13859 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) {
13860 // FIXME: Preserve type source info.
13861 QualType ET = GetTypeFromParser(DynamicExceptions[ei]);
13864 SmallVector<UnexpandedParameterPack, 2> Unexpanded;
13865 collectUnexpandedParameterPacks(ET, Unexpanded);
13866 if (!Unexpanded.empty()) {
13867 DiagnoseUnexpandedParameterPacks(
13868 DynamicExceptionRanges[ei].getBegin(), UPPC_ExceptionType,
13874 // Check that the type is valid for an exception spec, and
13876 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei]))
13877 Exceptions.push_back(ET);
13879 ESI.Exceptions = Exceptions;
13883 if (EST == EST_ComputedNoexcept) {
13884 // If an error occurred, there's no expression here.
13885 if (NoexceptExpr) {
13886 assert((NoexceptExpr->isTypeDependent() ||
13887 NoexceptExpr->getType()->getCanonicalTypeUnqualified() ==
13889 "Parser should have made sure that the expression is boolean");
13890 if (IsTopLevel && NoexceptExpr &&
13891 DiagnoseUnexpandedParameterPack(NoexceptExpr)) {
13892 ESI.Type = EST_BasicNoexcept;
13896 if (!NoexceptExpr->isValueDependent())
13897 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, nullptr,
13898 diag::err_noexcept_needs_constant_expression,
13899 /*AllowFold*/ false).get();
13900 ESI.NoexceptExpr = NoexceptExpr;
13906 void Sema::actOnDelayedExceptionSpecification(Decl *MethodD,
13907 ExceptionSpecificationType EST,
13908 SourceRange SpecificationRange,
13909 ArrayRef<ParsedType> DynamicExceptions,
13910 ArrayRef<SourceRange> DynamicExceptionRanges,
13911 Expr *NoexceptExpr) {
13915 // Dig out the method we're referring to.
13916 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(MethodD))
13917 MethodD = FunTmpl->getTemplatedDecl();
13919 CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(MethodD);
13923 // Check the exception specification.
13924 llvm::SmallVector<QualType, 4> Exceptions;
13925 FunctionProtoType::ExceptionSpecInfo ESI;
13926 checkExceptionSpecification(/*IsTopLevel*/true, EST, DynamicExceptions,
13927 DynamicExceptionRanges, NoexceptExpr, Exceptions,
13930 // Update the exception specification on the function type.
13931 Context.adjustExceptionSpec(Method, ESI, /*AsWritten*/true);
13933 if (Method->isStatic())
13934 checkThisInStaticMemberFunctionExceptionSpec(Method);
13936 if (Method->isVirtual()) {
13937 // Check overrides, which we previously had to delay.
13938 for (CXXMethodDecl::method_iterator O = Method->begin_overridden_methods(),
13939 OEnd = Method->end_overridden_methods();
13941 CheckOverridingFunctionExceptionSpec(Method, *O);
13945 /// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class.
13947 MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record,
13948 SourceLocation DeclStart,
13949 Declarator &D, Expr *BitWidth,
13950 InClassInitStyle InitStyle,
13951 AccessSpecifier AS,
13952 AttributeList *MSPropertyAttr) {
13953 IdentifierInfo *II = D.getIdentifier();
13955 Diag(DeclStart, diag::err_anonymous_property);
13958 SourceLocation Loc = D.getIdentifierLoc();
13960 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
13961 QualType T = TInfo->getType();
13962 if (getLangOpts().CPlusPlus) {
13963 CheckExtraCXXDefaultArguments(D);
13965 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
13966 UPPC_DataMemberType)) {
13967 D.setInvalidType();
13969 TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
13973 DiagnoseFunctionSpecifiers(D.getDeclSpec());
13975 if (D.getDeclSpec().isInlineSpecified())
13976 Diag(D.getDeclSpec().getInlineSpecLoc(), diag::err_inline_non_function)
13977 << getLangOpts().CPlusPlus1z;
13978 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec())
13979 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
13980 diag::err_invalid_thread)
13981 << DeclSpec::getSpecifierName(TSCS);
13983 // Check to see if this name was declared as a member previously
13984 NamedDecl *PrevDecl = nullptr;
13985 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration);
13986 LookupName(Previous, S);
13987 switch (Previous.getResultKind()) {
13988 case LookupResult::Found:
13989 case LookupResult::FoundUnresolvedValue:
13990 PrevDecl = Previous.getAsSingle<NamedDecl>();
13993 case LookupResult::FoundOverloaded:
13994 PrevDecl = Previous.getRepresentativeDecl();
13997 case LookupResult::NotFound:
13998 case LookupResult::NotFoundInCurrentInstantiation:
13999 case LookupResult::Ambiguous:
14003 if (PrevDecl && PrevDecl->isTemplateParameter()) {
14004 // Maybe we will complain about the shadowed template parameter.
14005 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
14006 // Just pretend that we didn't see the previous declaration.
14007 PrevDecl = nullptr;
14010 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
14011 PrevDecl = nullptr;
14013 SourceLocation TSSL = D.getLocStart();
14014 const AttributeList::PropertyData &Data = MSPropertyAttr->getPropertyData();
14015 MSPropertyDecl *NewPD = MSPropertyDecl::Create(
14016 Context, Record, Loc, II, T, TInfo, TSSL, Data.GetterId, Data.SetterId);
14017 ProcessDeclAttributes(TUScope, NewPD, D);
14018 NewPD->setAccess(AS);
14020 if (NewPD->isInvalidDecl())
14021 Record->setInvalidDecl();
14023 if (D.getDeclSpec().isModulePrivateSpecified())
14024 NewPD->setModulePrivate();
14026 if (NewPD->isInvalidDecl() && PrevDecl) {
14027 // Don't introduce NewFD into scope; there's already something
14028 // with the same name in the same scope.
14030 PushOnScopeChains(NewPD, S);
14032 Record->addDecl(NewPD);