1 //===------- SemaTemplate.cpp - Semantic Analysis for C++ Templates -------===/
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //===----------------------------------------------------------------------===/
9 // This file implements semantic analysis for C++ templates.
10 //===----------------------------------------------------------------------===/
12 #include "clang/Sema/SemaInternal.h"
13 #include "clang/Sema/Lookup.h"
14 #include "clang/Sema/Scope.h"
15 #include "clang/Sema/Template.h"
16 #include "clang/Sema/TemplateDeduction.h"
17 #include "TreeTransform.h"
18 #include "clang/AST/ASTContext.h"
19 #include "clang/AST/Expr.h"
20 #include "clang/AST/ExprCXX.h"
21 #include "clang/AST/DeclFriend.h"
22 #include "clang/AST/DeclTemplate.h"
23 #include "clang/Sema/DeclSpec.h"
24 #include "clang/Sema/ParsedTemplate.h"
25 #include "clang/Basic/LangOptions.h"
26 #include "clang/Basic/PartialDiagnostic.h"
27 #include "llvm/ADT/StringExtras.h"
28 using namespace clang
;
31 /// \brief Determine whether the declaration found is acceptable as the name
32 /// of a template and, if so, return that template declaration. Otherwise,
34 static NamedDecl
*isAcceptableTemplateName(ASTContext
&Context
,
36 NamedDecl
*D
= Orig
->getUnderlyingDecl();
38 if (isa
<TemplateDecl
>(D
))
41 if (CXXRecordDecl
*Record
= dyn_cast
<CXXRecordDecl
>(D
)) {
42 // C++ [temp.local]p1:
43 // Like normal (non-template) classes, class templates have an
44 // injected-class-name (Clause 9). The injected-class-name
45 // can be used with or without a template-argument-list. When
46 // it is used without a template-argument-list, it is
47 // equivalent to the injected-class-name followed by the
48 // template-parameters of the class template enclosed in
49 // <>. When it is used with a template-argument-list, it
50 // refers to the specified class template specialization,
51 // which could be the current specialization or another
53 if (Record
->isInjectedClassName()) {
54 Record
= cast
<CXXRecordDecl
>(Record
->getDeclContext());
55 if (Record
->getDescribedClassTemplate())
56 return Record
->getDescribedClassTemplate();
58 if (ClassTemplateSpecializationDecl
*Spec
59 = dyn_cast
<ClassTemplateSpecializationDecl
>(Record
))
60 return Spec
->getSpecializedTemplate();
69 static void FilterAcceptableTemplateNames(ASTContext
&C
, LookupResult
&R
) {
70 // The set of class templates we've already seen.
71 llvm::SmallPtrSet
<ClassTemplateDecl
*, 8> ClassTemplates
;
72 LookupResult::Filter filter
= R
.makeFilter();
73 while (filter
.hasNext()) {
74 NamedDecl
*Orig
= filter
.next();
75 NamedDecl
*Repl
= isAcceptableTemplateName(C
, Orig
);
78 else if (Repl
!= Orig
) {
80 // C++ [temp.local]p3:
81 // A lookup that finds an injected-class-name (10.2) can result in an
82 // ambiguity in certain cases (for example, if it is found in more than
83 // one base class). If all of the injected-class-names that are found
84 // refer to specializations of the same class template, and if the name
85 // is followed by a template-argument-list, the reference refers to the
86 // class template itself and not a specialization thereof, and is not
89 // FIXME: Will we eventually have to do the same for alias templates?
90 if (ClassTemplateDecl
*ClassTmpl
= dyn_cast
<ClassTemplateDecl
>(Repl
))
91 if (!ClassTemplates
.insert(ClassTmpl
)) {
96 // FIXME: we promote access to public here as a workaround to
97 // the fact that LookupResult doesn't let us remember that we
98 // found this template through a particular injected class name,
99 // which means we end up doing nasty things to the invariants.
100 // Pretending that access is public is *much* safer.
101 filter
.replace(Repl
, AS_public
);
107 TemplateNameKind
Sema::isTemplateName(Scope
*S
,
109 bool hasTemplateKeyword
,
111 ParsedType ObjectTypePtr
,
112 bool EnteringContext
,
113 TemplateTy
&TemplateResult
,
114 bool &MemberOfUnknownSpecialization
) {
115 assert(getLangOptions().CPlusPlus
&& "No template names in C!");
117 DeclarationName TName
;
118 MemberOfUnknownSpecialization
= false;
120 switch (Name
.getKind()) {
121 case UnqualifiedId::IK_Identifier
:
122 TName
= DeclarationName(Name
.Identifier
);
125 case UnqualifiedId::IK_OperatorFunctionId
:
126 TName
= Context
.DeclarationNames
.getCXXOperatorName(
127 Name
.OperatorFunctionId
.Operator
);
130 case UnqualifiedId::IK_LiteralOperatorId
:
131 TName
= Context
.DeclarationNames
.getCXXLiteralOperatorName(Name
.Identifier
);
135 return TNK_Non_template
;
138 QualType ObjectType
= ObjectTypePtr
.get();
140 LookupResult
R(*this, TName
, Name
.getSourceRange().getBegin(),
142 LookupTemplateName(R
, S
, SS
, ObjectType
, EnteringContext
,
143 MemberOfUnknownSpecialization
);
144 if (R
.empty() || R
.isAmbiguous()) {
145 R
.suppressDiagnostics();
146 return TNK_Non_template
;
149 TemplateName Template
;
150 TemplateNameKind TemplateKind
;
152 unsigned ResultCount
= R
.end() - R
.begin();
153 if (ResultCount
> 1) {
154 // We assume that we'll preserve the qualifier from a function
155 // template name in other ways.
156 Template
= Context
.getOverloadedTemplateName(R
.begin(), R
.end());
157 TemplateKind
= TNK_Function_template
;
159 // We'll do this lookup again later.
160 R
.suppressDiagnostics();
162 TemplateDecl
*TD
= cast
<TemplateDecl
>((*R
.begin())->getUnderlyingDecl());
164 if (SS
.isSet() && !SS
.isInvalid()) {
165 NestedNameSpecifier
*Qualifier
166 = static_cast<NestedNameSpecifier
*>(SS
.getScopeRep());
167 Template
= Context
.getQualifiedTemplateName(Qualifier
,
168 hasTemplateKeyword
, TD
);
170 Template
= TemplateName(TD
);
173 if (isa
<FunctionTemplateDecl
>(TD
)) {
174 TemplateKind
= TNK_Function_template
;
176 // We'll do this lookup again later.
177 R
.suppressDiagnostics();
179 assert(isa
<ClassTemplateDecl
>(TD
) || isa
<TemplateTemplateParmDecl
>(TD
));
180 TemplateKind
= TNK_Type_template
;
184 TemplateResult
= TemplateTy::make(Template
);
188 bool Sema::DiagnoseUnknownTemplateName(const IdentifierInfo
&II
,
189 SourceLocation IILoc
,
191 const CXXScopeSpec
*SS
,
192 TemplateTy
&SuggestedTemplate
,
193 TemplateNameKind
&SuggestedKind
) {
194 // We can't recover unless there's a dependent scope specifier preceding the
196 // FIXME: Typo correction?
197 if (!SS
|| !SS
->isSet() || !isDependentScopeSpecifier(*SS
) ||
198 computeDeclContext(*SS
))
201 // The code is missing a 'template' keyword prior to the dependent template
203 NestedNameSpecifier
*Qualifier
= (NestedNameSpecifier
*)SS
->getScopeRep();
204 Diag(IILoc
, diag::err_template_kw_missing
)
205 << Qualifier
<< II
.getName()
206 << FixItHint::CreateInsertion(IILoc
, "template ");
208 = TemplateTy::make(Context
.getDependentTemplateName(Qualifier
, &II
));
209 SuggestedKind
= TNK_Dependent_template_name
;
213 void Sema::LookupTemplateName(LookupResult
&Found
,
214 Scope
*S
, CXXScopeSpec
&SS
,
216 bool EnteringContext
,
217 bool &MemberOfUnknownSpecialization
) {
218 // Determine where to perform name lookup
219 MemberOfUnknownSpecialization
= false;
220 DeclContext
*LookupCtx
= 0;
221 bool isDependent
= false;
222 if (!ObjectType
.isNull()) {
223 // This nested-name-specifier occurs in a member access expression, e.g.,
224 // x->B::f, and we are looking into the type of the object.
225 assert(!SS
.isSet() && "ObjectType and scope specifier cannot coexist");
226 LookupCtx
= computeDeclContext(ObjectType
);
227 isDependent
= ObjectType
->isDependentType();
228 assert((isDependent
|| !ObjectType
->isIncompleteType()) &&
229 "Caller should have completed object type");
230 } else if (SS
.isSet()) {
231 // This nested-name-specifier occurs after another nested-name-specifier,
232 // so long into the context associated with the prior nested-name-specifier.
233 LookupCtx
= computeDeclContext(SS
, EnteringContext
);
234 isDependent
= isDependentScopeSpecifier(SS
);
236 // The declaration context must be complete.
237 if (LookupCtx
&& RequireCompleteDeclContext(SS
, LookupCtx
))
241 bool ObjectTypeSearchedInScope
= false;
243 // Perform "qualified" name lookup into the declaration context we
244 // computed, which is either the type of the base of a member access
245 // expression or the declaration context associated with a prior
246 // nested-name-specifier.
247 LookupQualifiedName(Found
, LookupCtx
);
249 if (!ObjectType
.isNull() && Found
.empty()) {
250 // C++ [basic.lookup.classref]p1:
251 // In a class member access expression (5.2.5), if the . or -> token is
252 // immediately followed by an identifier followed by a <, the
253 // identifier must be looked up to determine whether the < is the
254 // beginning of a template argument list (14.2) or a less-than operator.
255 // The identifier is first looked up in the class of the object
256 // expression. If the identifier is not found, it is then looked up in
257 // the context of the entire postfix-expression and shall name a class
258 // or function template.
259 if (S
) LookupName(Found
, S
);
260 ObjectTypeSearchedInScope
= true;
262 } else if (isDependent
&& (!S
|| ObjectType
.isNull())) {
263 // We cannot look into a dependent object type or nested nme
265 MemberOfUnknownSpecialization
= true;
268 // Perform unqualified name lookup in the current scope.
269 LookupName(Found
, S
);
272 if (Found
.empty() && !isDependent
) {
273 // If we did not find any names, attempt to correct any typos.
274 DeclarationName Name
= Found
.getLookupName();
275 if (DeclarationName Corrected
= CorrectTypo(Found
, S
, &SS
, LookupCtx
,
276 false, CTC_CXXCasts
)) {
277 FilterAcceptableTemplateNames(Context
, Found
);
278 if (!Found
.empty()) {
280 Diag(Found
.getNameLoc(), diag::err_no_member_template_suggest
)
281 << Name
<< LookupCtx
<< Found
.getLookupName() << SS
.getRange()
282 << FixItHint::CreateReplacement(Found
.getNameLoc(),
283 Found
.getLookupName().getAsString());
285 Diag(Found
.getNameLoc(), diag::err_no_template_suggest
)
286 << Name
<< Found
.getLookupName()
287 << FixItHint::CreateReplacement(Found
.getNameLoc(),
288 Found
.getLookupName().getAsString());
289 if (TemplateDecl
*Template
= Found
.getAsSingle
<TemplateDecl
>())
290 Diag(Template
->getLocation(), diag::note_previous_decl
)
291 << Template
->getDeclName();
295 Found
.setLookupName(Name
);
299 FilterAcceptableTemplateNames(Context
, Found
);
302 MemberOfUnknownSpecialization
= true;
306 if (S
&& !ObjectType
.isNull() && !ObjectTypeSearchedInScope
) {
307 // C++ [basic.lookup.classref]p1:
308 // [...] If the lookup in the class of the object expression finds a
309 // template, the name is also looked up in the context of the entire
310 // postfix-expression and [...]
312 LookupResult
FoundOuter(*this, Found
.getLookupName(), Found
.getNameLoc(),
314 LookupName(FoundOuter
, S
);
315 FilterAcceptableTemplateNames(Context
, FoundOuter
);
317 if (FoundOuter
.empty()) {
318 // - if the name is not found, the name found in the class of the
319 // object expression is used, otherwise
320 } else if (!FoundOuter
.getAsSingle
<ClassTemplateDecl
>()) {
321 // - if the name is found in the context of the entire
322 // postfix-expression and does not name a class template, the name
323 // found in the class of the object expression is used, otherwise
324 } else if (!Found
.isSuppressingDiagnostics()) {
325 // - if the name found is a class template, it must refer to the same
326 // entity as the one found in the class of the object expression,
327 // otherwise the program is ill-formed.
328 if (!Found
.isSingleResult() ||
329 Found
.getFoundDecl()->getCanonicalDecl()
330 != FoundOuter
.getFoundDecl()->getCanonicalDecl()) {
331 Diag(Found
.getNameLoc(),
332 diag::ext_nested_name_member_ref_lookup_ambiguous
)
333 << Found
.getLookupName()
335 Diag(Found
.getRepresentativeDecl()->getLocation(),
336 diag::note_ambig_member_ref_object_type
)
338 Diag(FoundOuter
.getFoundDecl()->getLocation(),
339 diag::note_ambig_member_ref_scope
);
341 // Recover by taking the template that we found in the object
342 // expression's type.
348 /// ActOnDependentIdExpression - Handle a dependent id-expression that
349 /// was just parsed. This is only possible with an explicit scope
350 /// specifier naming a dependent type.
352 Sema::ActOnDependentIdExpression(const CXXScopeSpec
&SS
,
353 const DeclarationNameInfo
&NameInfo
,
354 bool isAddressOfOperand
,
355 const TemplateArgumentListInfo
*TemplateArgs
) {
356 NestedNameSpecifier
*Qualifier
357 = static_cast<NestedNameSpecifier
*>(SS
.getScopeRep());
359 DeclContext
*DC
= getFunctionLevelDeclContext();
361 if (!isAddressOfOperand
&&
362 isa
<CXXMethodDecl
>(DC
) &&
363 cast
<CXXMethodDecl
>(DC
)->isInstance()) {
364 QualType ThisType
= cast
<CXXMethodDecl
>(DC
)->getThisType(Context
);
366 // Since the 'this' expression is synthesized, we don't need to
367 // perform the double-lookup check.
368 NamedDecl
*FirstQualifierInScope
= 0;
370 return Owned(CXXDependentScopeMemberExpr::Create(Context
,
371 /*This*/ 0, ThisType
,
373 /*Op*/ SourceLocation(),
374 Qualifier
, SS
.getRange(),
375 FirstQualifierInScope
,
380 return BuildDependentDeclRefExpr(SS
, NameInfo
, TemplateArgs
);
384 Sema::BuildDependentDeclRefExpr(const CXXScopeSpec
&SS
,
385 const DeclarationNameInfo
&NameInfo
,
386 const TemplateArgumentListInfo
*TemplateArgs
) {
387 return Owned(DependentScopeDeclRefExpr::Create(Context
,
388 static_cast<NestedNameSpecifier
*>(SS
.getScopeRep()),
394 /// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining
395 /// that the template parameter 'PrevDecl' is being shadowed by a new
396 /// declaration at location Loc. Returns true to indicate that this is
397 /// an error, and false otherwise.
398 bool Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc
, Decl
*PrevDecl
) {
399 assert(PrevDecl
->isTemplateParameter() && "Not a template parameter");
401 // Microsoft Visual C++ permits template parameters to be shadowed.
402 if (getLangOptions().Microsoft
)
405 // C++ [temp.local]p4:
406 // A template-parameter shall not be redeclared within its
407 // scope (including nested scopes).
408 Diag(Loc
, diag::err_template_param_shadow
)
409 << cast
<NamedDecl
>(PrevDecl
)->getDeclName();
410 Diag(PrevDecl
->getLocation(), diag::note_template_param_here
);
414 /// AdjustDeclIfTemplate - If the given decl happens to be a template, reset
415 /// the parameter D to reference the templated declaration and return a pointer
416 /// to the template declaration. Otherwise, do nothing to D and return null.
417 TemplateDecl
*Sema::AdjustDeclIfTemplate(Decl
*&D
) {
418 if (TemplateDecl
*Temp
= dyn_cast_or_null
<TemplateDecl
>(D
)) {
419 D
= Temp
->getTemplatedDecl();
425 static TemplateArgumentLoc
translateTemplateArgument(Sema
&SemaRef
,
426 const ParsedTemplateArgument
&Arg
) {
428 switch (Arg
.getKind()) {
429 case ParsedTemplateArgument::Type
: {
431 QualType T
= SemaRef
.GetTypeFromParser(Arg
.getAsType(), &DI
);
433 DI
= SemaRef
.Context
.getTrivialTypeSourceInfo(T
, Arg
.getLocation());
434 return TemplateArgumentLoc(TemplateArgument(T
), DI
);
437 case ParsedTemplateArgument::NonType
: {
438 Expr
*E
= static_cast<Expr
*>(Arg
.getAsExpr());
439 return TemplateArgumentLoc(TemplateArgument(E
), E
);
442 case ParsedTemplateArgument::Template
: {
443 TemplateName Template
= Arg
.getAsTemplate().get();
444 return TemplateArgumentLoc(TemplateArgument(Template
),
445 Arg
.getScopeSpec().getRange(),
450 llvm_unreachable("Unhandled parsed template argument");
451 return TemplateArgumentLoc();
454 /// \brief Translates template arguments as provided by the parser
455 /// into template arguments used by semantic analysis.
456 void Sema::translateTemplateArguments(const ASTTemplateArgsPtr
&TemplateArgsIn
,
457 TemplateArgumentListInfo
&TemplateArgs
) {
458 for (unsigned I
= 0, Last
= TemplateArgsIn
.size(); I
!= Last
; ++I
)
459 TemplateArgs
.addArgument(translateTemplateArgument(*this,
463 /// ActOnTypeParameter - Called when a C++ template type parameter
464 /// (e.g., "typename T") has been parsed. Typename specifies whether
465 /// the keyword "typename" was used to declare the type parameter
466 /// (otherwise, "class" was used), and KeyLoc is the location of the
467 /// "class" or "typename" keyword. ParamName is the name of the
468 /// parameter (NULL indicates an unnamed template parameter) and
469 /// ParamName is the location of the parameter name (if any).
470 /// If the type parameter has a default argument, it will be added
471 /// later via ActOnTypeParameterDefault.
472 Decl
*Sema::ActOnTypeParameter(Scope
*S
, bool Typename
, bool Ellipsis
,
473 SourceLocation EllipsisLoc
,
474 SourceLocation KeyLoc
,
475 IdentifierInfo
*ParamName
,
476 SourceLocation ParamNameLoc
,
477 unsigned Depth
, unsigned Position
,
478 SourceLocation EqualLoc
,
479 ParsedType DefaultArg
) {
480 assert(S
->isTemplateParamScope() &&
481 "Template type parameter not in template parameter scope!");
482 bool Invalid
= false;
485 NamedDecl
*PrevDecl
= LookupSingleName(S
, ParamName
, ParamNameLoc
,
488 if (PrevDecl
&& PrevDecl
->isTemplateParameter())
489 Invalid
= Invalid
|| DiagnoseTemplateParameterShadow(ParamNameLoc
,
493 SourceLocation Loc
= ParamNameLoc
;
497 TemplateTypeParmDecl
*Param
498 = TemplateTypeParmDecl::Create(Context
, Context
.getTranslationUnitDecl(),
499 Loc
, Depth
, Position
, ParamName
, Typename
,
502 Param
->setInvalidDecl();
505 // Add the template parameter into the current scope.
507 IdResolver
.AddDecl(Param
);
510 // Handle the default argument, if provided.
512 TypeSourceInfo
*DefaultTInfo
;
513 GetTypeFromParser(DefaultArg
, &DefaultTInfo
);
515 assert(DefaultTInfo
&& "expected source information for type");
517 // C++0x [temp.param]p9:
518 // A default template-argument may be specified for any kind of
519 // template-parameter that is not a template parameter pack.
521 Diag(EqualLoc
, diag::err_template_param_pack_default_arg
);
525 // Check the template argument itself.
526 if (CheckTemplateArgument(Param
, DefaultTInfo
)) {
527 Param
->setInvalidDecl();
531 Param
->setDefaultArgument(DefaultTInfo
, false);
537 /// \brief Check that the type of a non-type template parameter is
540 /// \returns the (possibly-promoted) parameter type if valid;
541 /// otherwise, produces a diagnostic and returns a NULL type.
543 Sema::CheckNonTypeTemplateParameterType(QualType T
, SourceLocation Loc
) {
544 // We don't allow variably-modified types as the type of non-type template
546 if (T
->isVariablyModifiedType()) {
547 Diag(Loc
, diag::err_variably_modified_nontype_template_param
)
552 // C++ [temp.param]p4:
554 // A non-type template-parameter shall have one of the following
555 // (optionally cv-qualified) types:
557 // -- integral or enumeration type,
558 if (T
->isIntegralOrEnumerationType() ||
559 // -- pointer to object or pointer to function,
560 T
->isPointerType() ||
561 // -- reference to object or reference to function,
562 T
->isReferenceType() ||
563 // -- pointer to member.
564 T
->isMemberPointerType() ||
565 // If T is a dependent type, we can't do the check now, so we
566 // assume that it is well-formed.
567 T
->isDependentType())
569 // C++ [temp.param]p8:
571 // A non-type template-parameter of type "array of T" or
572 // "function returning T" is adjusted to be of type "pointer to
573 // T" or "pointer to function returning T", respectively.
574 else if (T
->isArrayType())
575 // FIXME: Keep the type prior to promotion?
576 return Context
.getArrayDecayedType(T
);
577 else if (T
->isFunctionType())
578 // FIXME: Keep the type prior to promotion?
579 return Context
.getPointerType(T
);
581 Diag(Loc
, diag::err_template_nontype_parm_bad_type
)
587 Decl
*Sema::ActOnNonTypeTemplateParameter(Scope
*S
, Declarator
&D
,
590 SourceLocation EqualLoc
,
592 TypeSourceInfo
*TInfo
= GetTypeForDeclarator(D
, S
);
593 QualType T
= TInfo
->getType();
595 assert(S
->isTemplateParamScope() &&
596 "Non-type template parameter not in template parameter scope!");
597 bool Invalid
= false;
599 IdentifierInfo
*ParamName
= D
.getIdentifier();
601 NamedDecl
*PrevDecl
= LookupSingleName(S
, ParamName
, D
.getIdentifierLoc(),
604 if (PrevDecl
&& PrevDecl
->isTemplateParameter())
605 Invalid
= Invalid
|| DiagnoseTemplateParameterShadow(D
.getIdentifierLoc(),
609 T
= CheckNonTypeTemplateParameterType(T
, D
.getIdentifierLoc());
611 T
= Context
.IntTy
; // Recover with an 'int' type.
615 NonTypeTemplateParmDecl
*Param
616 = NonTypeTemplateParmDecl::Create(Context
, Context
.getTranslationUnitDecl(),
617 D
.getIdentifierLoc(),
618 Depth
, Position
, ParamName
, T
, TInfo
);
620 Param
->setInvalidDecl();
622 if (D
.getIdentifier()) {
623 // Add the template parameter into the current scope.
625 IdResolver
.AddDecl(Param
);
628 // Check the well-formedness of the default template argument, if provided.
630 TemplateArgument Converted
;
631 if (CheckTemplateArgument(Param
, Param
->getType(), Default
, Converted
)) {
632 Param
->setInvalidDecl();
636 Param
->setDefaultArgument(Default
, false);
642 /// ActOnTemplateTemplateParameter - Called when a C++ template template
643 /// parameter (e.g. T in template <template <typename> class T> class array)
644 /// has been parsed. S is the current scope.
645 Decl
*Sema::ActOnTemplateTemplateParameter(Scope
* S
,
646 SourceLocation TmpLoc
,
647 TemplateParamsTy
*Params
,
648 IdentifierInfo
*Name
,
649 SourceLocation NameLoc
,
652 SourceLocation EqualLoc
,
653 const ParsedTemplateArgument
&Default
) {
654 assert(S
->isTemplateParamScope() &&
655 "Template template parameter not in template parameter scope!");
657 // Construct the parameter object.
658 TemplateTemplateParmDecl
*Param
=
659 TemplateTemplateParmDecl::Create(Context
, Context
.getTranslationUnitDecl(),
660 TmpLoc
, Depth
, Position
, Name
,
661 (TemplateParameterList
*)Params
);
663 // If the template template parameter has a name, then link the identifier
664 // into the scope and lookup mechanisms.
667 IdResolver
.AddDecl(Param
);
670 if (!Default
.isInvalid()) {
671 // Check only that we have a template template argument. We don't want to
672 // try to check well-formedness now, because our template template parameter
673 // might have dependent types in its template parameters, which we wouldn't
674 // be able to match now.
676 // If none of the template template parameter's template arguments mention
677 // other template parameters, we could actually perform more checking here.
678 // However, it isn't worth doing.
679 TemplateArgumentLoc DefaultArg
= translateTemplateArgument(*this, Default
);
680 if (DefaultArg
.getArgument().getAsTemplate().isNull()) {
681 Diag(DefaultArg
.getLocation(), diag::err_template_arg_not_class_template
)
682 << DefaultArg
.getSourceRange();
686 Param
->setDefaultArgument(DefaultArg
, false);
692 /// ActOnTemplateParameterList - Builds a TemplateParameterList that
693 /// contains the template parameters in Params/NumParams.
694 Sema::TemplateParamsTy
*
695 Sema::ActOnTemplateParameterList(unsigned Depth
,
696 SourceLocation ExportLoc
,
697 SourceLocation TemplateLoc
,
698 SourceLocation LAngleLoc
,
699 Decl
**Params
, unsigned NumParams
,
700 SourceLocation RAngleLoc
) {
701 if (ExportLoc
.isValid())
702 Diag(ExportLoc
, diag::warn_template_export_unsupported
);
704 return TemplateParameterList::Create(Context
, TemplateLoc
, LAngleLoc
,
705 (NamedDecl
**)Params
, NumParams
,
709 static void SetNestedNameSpecifier(TagDecl
*T
, const CXXScopeSpec
&SS
) {
711 T
->setQualifierInfo(static_cast<NestedNameSpecifier
*>(SS
.getScopeRep()),
716 Sema::CheckClassTemplate(Scope
*S
, unsigned TagSpec
, TagUseKind TUK
,
717 SourceLocation KWLoc
, CXXScopeSpec
&SS
,
718 IdentifierInfo
*Name
, SourceLocation NameLoc
,
720 TemplateParameterList
*TemplateParams
,
721 AccessSpecifier AS
) {
722 assert(TemplateParams
&& TemplateParams
->size() > 0 &&
723 "No template parameters");
724 assert(TUK
!= TUK_Reference
&& "Can only declare or define class templates");
725 bool Invalid
= false;
727 // Check that we can declare a template here.
728 if (CheckTemplateDeclScope(S
, TemplateParams
))
731 TagTypeKind Kind
= TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec
);
732 assert(Kind
!= TTK_Enum
&& "can't build template of enumerated type");
734 // There is no such thing as an unnamed class template.
736 Diag(KWLoc
, diag::err_template_unnamed_class
);
740 // Find any previous declaration with this name.
741 DeclContext
*SemanticContext
;
742 LookupResult
Previous(*this, Name
, NameLoc
, LookupOrdinaryName
,
744 if (SS
.isNotEmpty() && !SS
.isInvalid()) {
745 SemanticContext
= computeDeclContext(SS
, true);
746 if (!SemanticContext
) {
747 // FIXME: Produce a reasonable diagnostic here
751 if (RequireCompleteDeclContext(SS
, SemanticContext
))
754 LookupQualifiedName(Previous
, SemanticContext
);
756 SemanticContext
= CurContext
;
757 LookupName(Previous
, S
);
760 if (Previous
.isAmbiguous())
763 NamedDecl
*PrevDecl
= 0;
764 if (Previous
.begin() != Previous
.end())
765 PrevDecl
= (*Previous
.begin())->getUnderlyingDecl();
767 // If there is a previous declaration with the same name, check
768 // whether this is a valid redeclaration.
769 ClassTemplateDecl
*PrevClassTemplate
770 = dyn_cast_or_null
<ClassTemplateDecl
>(PrevDecl
);
772 // We may have found the injected-class-name of a class template,
773 // class template partial specialization, or class template specialization.
774 // In these cases, grab the template that is being defined or specialized.
775 if (!PrevClassTemplate
&& PrevDecl
&& isa
<CXXRecordDecl
>(PrevDecl
) &&
776 cast
<CXXRecordDecl
>(PrevDecl
)->isInjectedClassName()) {
777 PrevDecl
= cast
<CXXRecordDecl
>(PrevDecl
->getDeclContext());
779 = cast
<CXXRecordDecl
>(PrevDecl
)->getDescribedClassTemplate();
780 if (!PrevClassTemplate
&& isa
<ClassTemplateSpecializationDecl
>(PrevDecl
)) {
782 = cast
<ClassTemplateSpecializationDecl
>(PrevDecl
)
783 ->getSpecializedTemplate();
787 if (TUK
== TUK_Friend
) {
788 // C++ [namespace.memdef]p3:
789 // [...] When looking for a prior declaration of a class or a function
790 // declared as a friend, and when the name of the friend class or
791 // function is neither a qualified name nor a template-id, scopes outside
792 // the innermost enclosing namespace scope are not considered.
794 DeclContext
*OutermostContext
= CurContext
;
795 while (!OutermostContext
->isFileContext())
796 OutermostContext
= OutermostContext
->getLookupParent();
799 (OutermostContext
->Equals(PrevDecl
->getDeclContext()) ||
800 OutermostContext
->Encloses(PrevDecl
->getDeclContext()))) {
801 SemanticContext
= PrevDecl
->getDeclContext();
803 // Declarations in outer scopes don't matter. However, the outermost
804 // context we computed is the semantic context for our new
806 PrevDecl
= PrevClassTemplate
= 0;
807 SemanticContext
= OutermostContext
;
811 if (CurContext
->isDependentContext()) {
812 // If this is a dependent context, we don't want to link the friend
813 // class template to the template in scope, because that would perform
814 // checking of the template parameter lists that can't be performed
815 // until the outer context is instantiated.
816 PrevDecl
= PrevClassTemplate
= 0;
818 } else if (PrevDecl
&& !isDeclInScope(PrevDecl
, SemanticContext
, S
))
819 PrevDecl
= PrevClassTemplate
= 0;
821 if (PrevClassTemplate
) {
822 // Ensure that the template parameter lists are compatible.
823 if (!TemplateParameterListsAreEqual(TemplateParams
,
824 PrevClassTemplate
->getTemplateParameters(),
829 // C++ [temp.class]p4:
830 // In a redeclaration, partial specialization, explicit
831 // specialization or explicit instantiation of a class template,
832 // the class-key shall agree in kind with the original class
833 // template declaration (7.1.5.3).
834 RecordDecl
*PrevRecordDecl
= PrevClassTemplate
->getTemplatedDecl();
835 if (!isAcceptableTagRedeclaration(PrevRecordDecl
, Kind
, KWLoc
, *Name
)) {
836 Diag(KWLoc
, diag::err_use_with_wrong_tag
)
838 << FixItHint::CreateReplacement(KWLoc
, PrevRecordDecl
->getKindName());
839 Diag(PrevRecordDecl
->getLocation(), diag::note_previous_use
);
840 Kind
= PrevRecordDecl
->getTagKind();
843 // Check for redefinition of this class template.
844 if (TUK
== TUK_Definition
) {
845 if (TagDecl
*Def
= PrevRecordDecl
->getDefinition()) {
846 Diag(NameLoc
, diag::err_redefinition
) << Name
;
847 Diag(Def
->getLocation(), diag::note_previous_definition
);
848 // FIXME: Would it make sense to try to "forget" the previous
849 // definition, as part of error recovery?
853 } else if (PrevDecl
&& PrevDecl
->isTemplateParameter()) {
854 // Maybe we will complain about the shadowed template parameter.
855 DiagnoseTemplateParameterShadow(NameLoc
, PrevDecl
);
856 // Just pretend that we didn't see the previous declaration.
858 } else if (PrevDecl
) {
860 // A class template shall not have the same name as any other
861 // template, class, function, object, enumeration, enumerator,
862 // namespace, or type in the same scope (3.3), except as specified
864 Diag(NameLoc
, diag::err_redefinition_different_kind
) << Name
;
865 Diag(PrevDecl
->getLocation(), diag::note_previous_definition
);
869 // Check the template parameter list of this declaration, possibly
870 // merging in the template parameter list from the previous class
871 // template declaration.
872 if (CheckTemplateParameterList(TemplateParams
,
873 PrevClassTemplate
? PrevClassTemplate
->getTemplateParameters() : 0,
878 // If the name of the template was qualified, we must be defining the
879 // template out-of-line.
880 if (!SS
.isInvalid() && !Invalid
&& !PrevClassTemplate
&&
881 !(TUK
== TUK_Friend
&& CurContext
->isDependentContext()))
882 Diag(NameLoc
, diag::err_member_def_does_not_match
)
883 << Name
<< SemanticContext
<< SS
.getRange();
886 CXXRecordDecl
*NewClass
=
887 CXXRecordDecl::Create(Context
, Kind
, SemanticContext
, NameLoc
, Name
, KWLoc
,
889 PrevClassTemplate
->getTemplatedDecl() : 0,
890 /*DelayTypeCreation=*/true);
891 SetNestedNameSpecifier(NewClass
, SS
);
893 ClassTemplateDecl
*NewTemplate
894 = ClassTemplateDecl::Create(Context
, SemanticContext
, NameLoc
,
895 DeclarationName(Name
), TemplateParams
,
896 NewClass
, PrevClassTemplate
);
897 NewClass
->setDescribedClassTemplate(NewTemplate
);
899 // Build the type for the class template declaration now.
900 QualType T
= NewTemplate
->getInjectedClassNameSpecialization();
901 T
= Context
.getInjectedClassNameType(NewClass
, T
);
902 assert(T
->isDependentType() && "Class template type is not dependent?");
905 // If we are providing an explicit specialization of a member that is a
906 // class template, make a note of that.
907 if (PrevClassTemplate
&&
908 PrevClassTemplate
->getInstantiatedFromMemberTemplate())
909 PrevClassTemplate
->setMemberSpecialization();
911 // Set the access specifier.
912 if (!Invalid
&& TUK
!= TUK_Friend
)
913 SetMemberAccessSpecifier(NewTemplate
, PrevClassTemplate
, AS
);
915 // Set the lexical context of these templates
916 NewClass
->setLexicalDeclContext(CurContext
);
917 NewTemplate
->setLexicalDeclContext(CurContext
);
919 if (TUK
== TUK_Definition
)
920 NewClass
->startDefinition();
923 ProcessDeclAttributeList(S
, NewClass
, Attr
);
925 if (TUK
!= TUK_Friend
)
926 PushOnScopeChains(NewTemplate
, S
);
928 if (PrevClassTemplate
&& PrevClassTemplate
->getAccess() != AS_none
) {
929 NewTemplate
->setAccess(PrevClassTemplate
->getAccess());
930 NewClass
->setAccess(PrevClassTemplate
->getAccess());
933 NewTemplate
->setObjectOfFriendDecl(/* PreviouslyDeclared = */
934 PrevClassTemplate
!= NULL
);
936 // Friend templates are visible in fairly strange ways.
937 if (!CurContext
->isDependentContext()) {
938 DeclContext
*DC
= SemanticContext
->getLookupContext();
939 DC
->makeDeclVisibleInContext(NewTemplate
, /* Recoverable = */ false);
940 if (Scope
*EnclosingScope
= getScopeForDeclContext(S
, DC
))
941 PushOnScopeChains(NewTemplate
, EnclosingScope
,
942 /* AddToContext = */ false);
945 FriendDecl
*Friend
= FriendDecl::Create(Context
, CurContext
,
946 NewClass
->getLocation(),
948 /*FIXME:*/NewClass
->getLocation());
949 Friend
->setAccess(AS_public
);
950 CurContext
->addDecl(Friend
);
954 NewTemplate
->setInvalidDecl();
955 NewClass
->setInvalidDecl();
960 /// \brief Diagnose the presence of a default template argument on a
961 /// template parameter, which is ill-formed in certain contexts.
963 /// \returns true if the default template argument should be dropped.
964 static bool DiagnoseDefaultTemplateArgument(Sema
&S
,
965 Sema::TemplateParamListContext TPC
,
966 SourceLocation ParamLoc
,
967 SourceRange DefArgRange
) {
969 case Sema::TPC_ClassTemplate
:
972 case Sema::TPC_FunctionTemplate
:
973 // C++ [temp.param]p9:
974 // A default template-argument shall not be specified in a
975 // function template declaration or a function template
977 // (This sentence is not in C++0x, per DR226).
978 if (!S
.getLangOptions().CPlusPlus0x
)
980 diag::err_template_parameter_default_in_function_template
)
984 case Sema::TPC_ClassTemplateMember
:
985 // C++0x [temp.param]p9:
986 // A default template-argument shall not be specified in the
987 // template-parameter-lists of the definition of a member of a
988 // class template that appears outside of the member's class.
989 S
.Diag(ParamLoc
, diag::err_template_parameter_default_template_member
)
993 case Sema::TPC_FriendFunctionTemplate
:
994 // C++ [temp.param]p9:
995 // A default template-argument shall not be specified in a
996 // friend template declaration.
997 S
.Diag(ParamLoc
, diag::err_template_parameter_default_friend_template
)
1001 // FIXME: C++0x [temp.param]p9 allows default template-arguments
1002 // for friend function templates if there is only a single
1003 // declaration (and it is a definition). Strange!
1009 /// \brief Checks the validity of a template parameter list, possibly
1010 /// considering the template parameter list from a previous
1013 /// If an "old" template parameter list is provided, it must be
1014 /// equivalent (per TemplateParameterListsAreEqual) to the "new"
1015 /// template parameter list.
1017 /// \param NewParams Template parameter list for a new template
1018 /// declaration. This template parameter list will be updated with any
1019 /// default arguments that are carried through from the previous
1020 /// template parameter list.
1022 /// \param OldParams If provided, template parameter list from a
1023 /// previous declaration of the same template. Default template
1024 /// arguments will be merged from the old template parameter list to
1025 /// the new template parameter list.
1027 /// \param TPC Describes the context in which we are checking the given
1028 /// template parameter list.
1030 /// \returns true if an error occurred, false otherwise.
1031 bool Sema::CheckTemplateParameterList(TemplateParameterList
*NewParams
,
1032 TemplateParameterList
*OldParams
,
1033 TemplateParamListContext TPC
) {
1034 bool Invalid
= false;
1036 // C++ [temp.param]p10:
1037 // The set of default template-arguments available for use with a
1038 // template declaration or definition is obtained by merging the
1039 // default arguments from the definition (if in scope) and all
1040 // declarations in scope in the same way default function
1041 // arguments are (8.3.6).
1042 bool SawDefaultArgument
= false;
1043 SourceLocation PreviousDefaultArgLoc
;
1045 bool SawParameterPack
= false;
1046 SourceLocation ParameterPackLoc
;
1048 // Dummy initialization to avoid warnings.
1049 TemplateParameterList::iterator OldParam
= NewParams
->end();
1051 OldParam
= OldParams
->begin();
1053 for (TemplateParameterList::iterator NewParam
= NewParams
->begin(),
1054 NewParamEnd
= NewParams
->end();
1055 NewParam
!= NewParamEnd
; ++NewParam
) {
1056 // Variables used to diagnose redundant default arguments
1057 bool RedundantDefaultArg
= false;
1058 SourceLocation OldDefaultLoc
;
1059 SourceLocation NewDefaultLoc
;
1061 // Variables used to diagnose missing default arguments
1062 bool MissingDefaultArg
= false;
1064 // C++0x [temp.param]p11:
1065 // If a template parameter of a class template is a template parameter pack,
1066 // it must be the last template parameter.
1067 if (SawParameterPack
) {
1068 Diag(ParameterPackLoc
,
1069 diag::err_template_param_pack_must_be_last_template_parameter
);
1073 if (TemplateTypeParmDecl
*NewTypeParm
1074 = dyn_cast
<TemplateTypeParmDecl
>(*NewParam
)) {
1075 // Check the presence of a default argument here.
1076 if (NewTypeParm
->hasDefaultArgument() &&
1077 DiagnoseDefaultTemplateArgument(*this, TPC
,
1078 NewTypeParm
->getLocation(),
1079 NewTypeParm
->getDefaultArgumentInfo()->getTypeLoc()
1081 NewTypeParm
->removeDefaultArgument();
1083 // Merge default arguments for template type parameters.
1084 TemplateTypeParmDecl
*OldTypeParm
1085 = OldParams
? cast
<TemplateTypeParmDecl
>(*OldParam
) : 0;
1087 if (NewTypeParm
->isParameterPack()) {
1088 assert(!NewTypeParm
->hasDefaultArgument() &&
1089 "Parameter packs can't have a default argument!");
1090 SawParameterPack
= true;
1091 ParameterPackLoc
= NewTypeParm
->getLocation();
1092 } else if (OldTypeParm
&& OldTypeParm
->hasDefaultArgument() &&
1093 NewTypeParm
->hasDefaultArgument()) {
1094 OldDefaultLoc
= OldTypeParm
->getDefaultArgumentLoc();
1095 NewDefaultLoc
= NewTypeParm
->getDefaultArgumentLoc();
1096 SawDefaultArgument
= true;
1097 RedundantDefaultArg
= true;
1098 PreviousDefaultArgLoc
= NewDefaultLoc
;
1099 } else if (OldTypeParm
&& OldTypeParm
->hasDefaultArgument()) {
1100 // Merge the default argument from the old declaration to the
1102 SawDefaultArgument
= true;
1103 NewTypeParm
->setDefaultArgument(OldTypeParm
->getDefaultArgumentInfo(),
1105 PreviousDefaultArgLoc
= OldTypeParm
->getDefaultArgumentLoc();
1106 } else if (NewTypeParm
->hasDefaultArgument()) {
1107 SawDefaultArgument
= true;
1108 PreviousDefaultArgLoc
= NewTypeParm
->getDefaultArgumentLoc();
1109 } else if (SawDefaultArgument
)
1110 MissingDefaultArg
= true;
1111 } else if (NonTypeTemplateParmDecl
*NewNonTypeParm
1112 = dyn_cast
<NonTypeTemplateParmDecl
>(*NewParam
)) {
1113 // Check the presence of a default argument here.
1114 if (NewNonTypeParm
->hasDefaultArgument() &&
1115 DiagnoseDefaultTemplateArgument(*this, TPC
,
1116 NewNonTypeParm
->getLocation(),
1117 NewNonTypeParm
->getDefaultArgument()->getSourceRange())) {
1118 NewNonTypeParm
->removeDefaultArgument();
1121 // Merge default arguments for non-type template parameters
1122 NonTypeTemplateParmDecl
*OldNonTypeParm
1123 = OldParams
? cast
<NonTypeTemplateParmDecl
>(*OldParam
) : 0;
1124 if (OldNonTypeParm
&& OldNonTypeParm
->hasDefaultArgument() &&
1125 NewNonTypeParm
->hasDefaultArgument()) {
1126 OldDefaultLoc
= OldNonTypeParm
->getDefaultArgumentLoc();
1127 NewDefaultLoc
= NewNonTypeParm
->getDefaultArgumentLoc();
1128 SawDefaultArgument
= true;
1129 RedundantDefaultArg
= true;
1130 PreviousDefaultArgLoc
= NewDefaultLoc
;
1131 } else if (OldNonTypeParm
&& OldNonTypeParm
->hasDefaultArgument()) {
1132 // Merge the default argument from the old declaration to the
1134 SawDefaultArgument
= true;
1135 // FIXME: We need to create a new kind of "default argument"
1136 // expression that points to a previous template template
1138 NewNonTypeParm
->setDefaultArgument(
1139 OldNonTypeParm
->getDefaultArgument(),
1140 /*Inherited=*/ true);
1141 PreviousDefaultArgLoc
= OldNonTypeParm
->getDefaultArgumentLoc();
1142 } else if (NewNonTypeParm
->hasDefaultArgument()) {
1143 SawDefaultArgument
= true;
1144 PreviousDefaultArgLoc
= NewNonTypeParm
->getDefaultArgumentLoc();
1145 } else if (SawDefaultArgument
)
1146 MissingDefaultArg
= true;
1148 // Check the presence of a default argument here.
1149 TemplateTemplateParmDecl
*NewTemplateParm
1150 = cast
<TemplateTemplateParmDecl
>(*NewParam
);
1151 if (NewTemplateParm
->hasDefaultArgument() &&
1152 DiagnoseDefaultTemplateArgument(*this, TPC
,
1153 NewTemplateParm
->getLocation(),
1154 NewTemplateParm
->getDefaultArgument().getSourceRange()))
1155 NewTemplateParm
->removeDefaultArgument();
1157 // Merge default arguments for template template parameters
1158 TemplateTemplateParmDecl
*OldTemplateParm
1159 = OldParams
? cast
<TemplateTemplateParmDecl
>(*OldParam
) : 0;
1160 if (OldTemplateParm
&& OldTemplateParm
->hasDefaultArgument() &&
1161 NewTemplateParm
->hasDefaultArgument()) {
1162 OldDefaultLoc
= OldTemplateParm
->getDefaultArgument().getLocation();
1163 NewDefaultLoc
= NewTemplateParm
->getDefaultArgument().getLocation();
1164 SawDefaultArgument
= true;
1165 RedundantDefaultArg
= true;
1166 PreviousDefaultArgLoc
= NewDefaultLoc
;
1167 } else if (OldTemplateParm
&& OldTemplateParm
->hasDefaultArgument()) {
1168 // Merge the default argument from the old declaration to the
1170 SawDefaultArgument
= true;
1171 // FIXME: We need to create a new kind of "default argument" expression
1172 // that points to a previous template template parameter.
1173 NewTemplateParm
->setDefaultArgument(
1174 OldTemplateParm
->getDefaultArgument(),
1175 /*Inherited=*/ true);
1176 PreviousDefaultArgLoc
1177 = OldTemplateParm
->getDefaultArgument().getLocation();
1178 } else if (NewTemplateParm
->hasDefaultArgument()) {
1179 SawDefaultArgument
= true;
1180 PreviousDefaultArgLoc
1181 = NewTemplateParm
->getDefaultArgument().getLocation();
1182 } else if (SawDefaultArgument
)
1183 MissingDefaultArg
= true;
1186 if (RedundantDefaultArg
) {
1187 // C++ [temp.param]p12:
1188 // A template-parameter shall not be given default arguments
1189 // by two different declarations in the same scope.
1190 Diag(NewDefaultLoc
, diag::err_template_param_default_arg_redefinition
);
1191 Diag(OldDefaultLoc
, diag::note_template_param_prev_default_arg
);
1193 } else if (MissingDefaultArg
) {
1194 // C++ [temp.param]p11:
1195 // If a template-parameter has a default template-argument,
1196 // all subsequent template-parameters shall have a default
1197 // template-argument supplied.
1198 Diag((*NewParam
)->getLocation(),
1199 diag::err_template_param_default_arg_missing
);
1200 Diag(PreviousDefaultArgLoc
, diag::note_template_param_prev_default_arg
);
1204 // If we have an old template parameter list that we're merging
1205 // in, move on to the next parameter.
1213 /// \brief Match the given template parameter lists to the given scope
1214 /// specifier, returning the template parameter list that applies to the
1217 /// \param DeclStartLoc the start of the declaration that has a scope
1218 /// specifier or a template parameter list.
1220 /// \param SS the scope specifier that will be matched to the given template
1221 /// parameter lists. This scope specifier precedes a qualified name that is
1224 /// \param ParamLists the template parameter lists, from the outermost to the
1225 /// innermost template parameter lists.
1227 /// \param NumParamLists the number of template parameter lists in ParamLists.
1229 /// \param IsFriend Whether to apply the slightly different rules for
1230 /// matching template parameters to scope specifiers in friend
1233 /// \param IsExplicitSpecialization will be set true if the entity being
1234 /// declared is an explicit specialization, false otherwise.
1236 /// \returns the template parameter list, if any, that corresponds to the
1237 /// name that is preceded by the scope specifier @p SS. This template
1238 /// parameter list may be have template parameters (if we're declaring a
1239 /// template) or may have no template parameters (if we're declaring a
1240 /// template specialization), or may be NULL (if we were's declaring isn't
1241 /// itself a template).
1242 TemplateParameterList
*
1243 Sema::MatchTemplateParametersToScopeSpecifier(SourceLocation DeclStartLoc
,
1244 const CXXScopeSpec
&SS
,
1245 TemplateParameterList
**ParamLists
,
1246 unsigned NumParamLists
,
1248 bool &IsExplicitSpecialization
,
1250 IsExplicitSpecialization
= false;
1252 // Find the template-ids that occur within the nested-name-specifier. These
1253 // template-ids will match up with the template parameter lists.
1254 llvm::SmallVector
<const TemplateSpecializationType
*, 4>
1255 TemplateIdsInSpecifier
;
1256 llvm::SmallVector
<ClassTemplateSpecializationDecl
*, 4>
1257 ExplicitSpecializationsInSpecifier
;
1258 for (NestedNameSpecifier
*NNS
= (NestedNameSpecifier
*)SS
.getScopeRep();
1259 NNS
; NNS
= NNS
->getPrefix()) {
1260 const Type
*T
= NNS
->getAsType();
1263 // C++0x [temp.expl.spec]p17:
1264 // A member or a member template may be nested within many
1265 // enclosing class templates. In an explicit specialization for
1266 // such a member, the member declaration shall be preceded by a
1267 // template<> for each enclosing class template that is
1268 // explicitly specialized.
1270 // Following the existing practice of GNU and EDG, we allow a typedef of a
1271 // template specialization type.
1272 if (const TypedefType
*TT
= dyn_cast
<TypedefType
>(T
))
1273 T
= TT
->LookThroughTypedefs().getTypePtr();
1275 if (const TemplateSpecializationType
*SpecType
1276 = dyn_cast
<TemplateSpecializationType
>(T
)) {
1277 TemplateDecl
*Template
= SpecType
->getTemplateName().getAsTemplateDecl();
1279 continue; // FIXME: should this be an error? probably...
1281 if (const RecordType
*Record
= SpecType
->getAs
<RecordType
>()) {
1282 ClassTemplateSpecializationDecl
*SpecDecl
1283 = cast
<ClassTemplateSpecializationDecl
>(Record
->getDecl());
1284 // If the nested name specifier refers to an explicit specialization,
1285 // we don't need a template<> header.
1286 if (SpecDecl
->getSpecializationKind() == TSK_ExplicitSpecialization
) {
1287 ExplicitSpecializationsInSpecifier
.push_back(SpecDecl
);
1292 TemplateIdsInSpecifier
.push_back(SpecType
);
1296 // Reverse the list of template-ids in the scope specifier, so that we can
1297 // more easily match up the template-ids and the template parameter lists.
1298 std::reverse(TemplateIdsInSpecifier
.begin(), TemplateIdsInSpecifier
.end());
1300 SourceLocation FirstTemplateLoc
= DeclStartLoc
;
1302 FirstTemplateLoc
= ParamLists
[0]->getTemplateLoc();
1304 // Match the template-ids found in the specifier to the template parameter
1307 for (unsigned NumTemplateIds
= TemplateIdsInSpecifier
.size();
1308 Idx
!= NumTemplateIds
; ++Idx
) {
1309 QualType TemplateId
= QualType(TemplateIdsInSpecifier
[Idx
], 0);
1310 bool DependentTemplateId
= TemplateId
->isDependentType();
1311 if (Idx
>= NumParamLists
) {
1312 // We have a template-id without a corresponding template parameter
1315 // ...which is fine if this is a friend declaration.
1317 IsExplicitSpecialization
= true;
1321 if (DependentTemplateId
) {
1322 // FIXME: the location information here isn't great.
1323 Diag(SS
.getRange().getBegin(),
1324 diag::err_template_spec_needs_template_parameters
)
1329 Diag(SS
.getRange().getBegin(), diag::err_template_spec_needs_header
)
1331 << FixItHint::CreateInsertion(FirstTemplateLoc
, "template<> ");
1332 IsExplicitSpecialization
= true;
1337 // Check the template parameter list against its corresponding template-id.
1338 if (DependentTemplateId
) {
1339 TemplateParameterList
*ExpectedTemplateParams
= 0;
1341 // Are there cases in (e.g.) friends where this won't match?
1342 if (const InjectedClassNameType
*Injected
1343 = TemplateId
->getAs
<InjectedClassNameType
>()) {
1344 CXXRecordDecl
*Record
= Injected
->getDecl();
1345 if (ClassTemplatePartialSpecializationDecl
*Partial
=
1346 dyn_cast
<ClassTemplatePartialSpecializationDecl
>(Record
))
1347 ExpectedTemplateParams
= Partial
->getTemplateParameters();
1349 ExpectedTemplateParams
= Record
->getDescribedClassTemplate()
1350 ->getTemplateParameters();
1353 if (ExpectedTemplateParams
)
1354 TemplateParameterListsAreEqual(ParamLists
[Idx
],
1355 ExpectedTemplateParams
,
1356 true, TPL_TemplateMatch
);
1358 CheckTemplateParameterList(ParamLists
[Idx
], 0, TPC_ClassTemplateMember
);
1359 } else if (ParamLists
[Idx
]->size() > 0)
1360 Diag(ParamLists
[Idx
]->getTemplateLoc(),
1361 diag::err_template_param_list_matches_nontemplate
)
1363 << ParamLists
[Idx
]->getSourceRange();
1365 IsExplicitSpecialization
= true;
1368 // If there were at least as many template-ids as there were template
1369 // parameter lists, then there are no template parameter lists remaining for
1370 // the declaration itself.
1371 if (Idx
>= NumParamLists
)
1374 // If there were too many template parameter lists, complain about that now.
1375 if (Idx
!= NumParamLists
- 1) {
1376 while (Idx
< NumParamLists
- 1) {
1377 bool isExplicitSpecHeader
= ParamLists
[Idx
]->size() == 0;
1378 Diag(ParamLists
[Idx
]->getTemplateLoc(),
1379 isExplicitSpecHeader
? diag::warn_template_spec_extra_headers
1380 : diag::err_template_spec_extra_headers
)
1381 << SourceRange(ParamLists
[Idx
]->getTemplateLoc(),
1382 ParamLists
[Idx
]->getRAngleLoc());
1384 if (isExplicitSpecHeader
&& !ExplicitSpecializationsInSpecifier
.empty()) {
1385 Diag(ExplicitSpecializationsInSpecifier
.back()->getLocation(),
1386 diag::note_explicit_template_spec_does_not_need_header
)
1387 << ExplicitSpecializationsInSpecifier
.back();
1388 ExplicitSpecializationsInSpecifier
.pop_back();
1391 // We have a template parameter list with no corresponding scope, which
1392 // means that the resulting template declaration can't be instantiated
1393 // properly (we'll end up with dependent nodes when we shouldn't).
1394 if (!isExplicitSpecHeader
)
1401 // Return the last template parameter list, which corresponds to the
1402 // entity being declared.
1403 return ParamLists
[NumParamLists
- 1];
1406 QualType
Sema::CheckTemplateIdType(TemplateName Name
,
1407 SourceLocation TemplateLoc
,
1408 const TemplateArgumentListInfo
&TemplateArgs
) {
1409 TemplateDecl
*Template
= Name
.getAsTemplateDecl();
1411 // The template name does not resolve to a template, so we just
1412 // build a dependent template-id type.
1413 return Context
.getTemplateSpecializationType(Name
, TemplateArgs
);
1416 // Check that the template argument list is well-formed for this
1418 TemplateArgumentListBuilder
Converted(Template
->getTemplateParameters(),
1419 TemplateArgs
.size());
1420 if (CheckTemplateArgumentList(Template
, TemplateLoc
, TemplateArgs
,
1424 assert((Converted
.structuredSize() ==
1425 Template
->getTemplateParameters()->size()) &&
1426 "Converted template argument list is too short!");
1430 if (Name
.isDependent() ||
1431 TemplateSpecializationType::anyDependentTemplateArguments(
1433 // This class template specialization is a dependent
1434 // type. Therefore, its canonical type is another class template
1435 // specialization type that contains all of the converted
1436 // arguments in canonical form. This ensures that, e.g., A<T> and
1437 // A<T, T> have identical types when A is declared as:
1439 // template<typename T, typename U = T> struct A;
1440 TemplateName CanonName
= Context
.getCanonicalTemplateName(Name
);
1441 CanonType
= Context
.getTemplateSpecializationType(CanonName
,
1442 Converted
.getFlatArguments(),
1443 Converted
.flatSize());
1445 // FIXME: CanonType is not actually the canonical type, and unfortunately
1446 // it is a TemplateSpecializationType that we will never use again.
1447 // In the future, we need to teach getTemplateSpecializationType to only
1448 // build the canonical type and return that to us.
1449 CanonType
= Context
.getCanonicalType(CanonType
);
1451 // This might work out to be a current instantiation, in which
1452 // case the canonical type needs to be the InjectedClassNameType.
1454 // TODO: in theory this could be a simple hashtable lookup; most
1455 // changes to CurContext don't change the set of current
1457 if (isa
<ClassTemplateDecl
>(Template
)) {
1458 for (DeclContext
*Ctx
= CurContext
; Ctx
; Ctx
= Ctx
->getLookupParent()) {
1459 // If we get out to a namespace, we're done.
1460 if (Ctx
->isFileContext()) break;
1462 // If this isn't a record, keep looking.
1463 CXXRecordDecl
*Record
= dyn_cast
<CXXRecordDecl
>(Ctx
);
1464 if (!Record
) continue;
1466 // Look for one of the two cases with InjectedClassNameTypes
1467 // and check whether it's the same template.
1468 if (!isa
<ClassTemplatePartialSpecializationDecl
>(Record
) &&
1469 !Record
->getDescribedClassTemplate())
1472 // Fetch the injected class name type and check whether its
1473 // injected type is equal to the type we just built.
1474 QualType ICNT
= Context
.getTypeDeclType(Record
);
1475 QualType Injected
= cast
<InjectedClassNameType
>(ICNT
)
1476 ->getInjectedSpecializationType();
1478 if (CanonType
!= Injected
->getCanonicalTypeInternal())
1481 // If so, the canonical type of this TST is the injected
1482 // class name type of the record we just found.
1483 assert(ICNT
.isCanonical());
1488 } else if (ClassTemplateDecl
*ClassTemplate
1489 = dyn_cast
<ClassTemplateDecl
>(Template
)) {
1490 // Find the class template specialization declaration that
1491 // corresponds to these arguments.
1492 void *InsertPos
= 0;
1493 ClassTemplateSpecializationDecl
*Decl
1494 = ClassTemplate
->findSpecialization(Converted
.getFlatArguments(),
1495 Converted
.flatSize(), InsertPos
);
1497 // This is the first time we have referenced this class template
1498 // specialization. Create the canonical declaration and add it to
1499 // the set of specializations.
1500 Decl
= ClassTemplateSpecializationDecl::Create(Context
,
1501 ClassTemplate
->getTemplatedDecl()->getTagKind(),
1502 ClassTemplate
->getDeclContext(),
1503 ClassTemplate
->getLocation(),
1506 ClassTemplate
->AddSpecialization(Decl
, InsertPos
);
1507 Decl
->setLexicalDeclContext(CurContext
);
1510 CanonType
= Context
.getTypeDeclType(Decl
);
1511 assert(isa
<RecordType
>(CanonType
) &&
1512 "type of non-dependent specialization is not a RecordType");
1515 // Build the fully-sugared type for this class template
1516 // specialization, which refers back to the class template
1517 // specialization we created or found.
1518 return Context
.getTemplateSpecializationType(Name
, TemplateArgs
, CanonType
);
1522 Sema::ActOnTemplateIdType(TemplateTy TemplateD
, SourceLocation TemplateLoc
,
1523 SourceLocation LAngleLoc
,
1524 ASTTemplateArgsPtr TemplateArgsIn
,
1525 SourceLocation RAngleLoc
) {
1526 TemplateName Template
= TemplateD
.getAsVal
<TemplateName
>();
1528 // Translate the parser's template argument list in our AST format.
1529 TemplateArgumentListInfo
TemplateArgs(LAngleLoc
, RAngleLoc
);
1530 translateTemplateArguments(TemplateArgsIn
, TemplateArgs
);
1532 QualType Result
= CheckTemplateIdType(Template
, TemplateLoc
, TemplateArgs
);
1533 TemplateArgsIn
.release();
1535 if (Result
.isNull())
1538 TypeSourceInfo
*DI
= Context
.CreateTypeSourceInfo(Result
);
1539 TemplateSpecializationTypeLoc TL
1540 = cast
<TemplateSpecializationTypeLoc
>(DI
->getTypeLoc());
1541 TL
.setTemplateNameLoc(TemplateLoc
);
1542 TL
.setLAngleLoc(LAngleLoc
);
1543 TL
.setRAngleLoc(RAngleLoc
);
1544 for (unsigned i
= 0, e
= TL
.getNumArgs(); i
!= e
; ++i
)
1545 TL
.setArgLocInfo(i
, TemplateArgs
[i
].getLocInfo());
1547 return CreateParsedType(Result
, DI
);
1550 TypeResult
Sema::ActOnTagTemplateIdType(TypeResult TypeResult
,
1552 TypeSpecifierType TagSpec
,
1553 SourceLocation TagLoc
) {
1554 if (TypeResult
.isInvalid())
1555 return ::TypeResult();
1557 // FIXME: preserve source info, ideally without copying the DI.
1559 QualType Type
= GetTypeFromParser(TypeResult
.get(), &DI
);
1561 // Verify the tag specifier.
1562 TagTypeKind TagKind
= TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec
);
1564 if (const RecordType
*RT
= Type
->getAs
<RecordType
>()) {
1565 RecordDecl
*D
= RT
->getDecl();
1567 IdentifierInfo
*Id
= D
->getIdentifier();
1568 assert(Id
&& "templated class must have an identifier");
1570 if (!isAcceptableTagRedeclaration(D
, TagKind
, TagLoc
, *Id
)) {
1571 Diag(TagLoc
, diag::err_use_with_wrong_tag
)
1573 << FixItHint::CreateReplacement(SourceRange(TagLoc
), D
->getKindName());
1574 Diag(D
->getLocation(), diag::note_previous_use
);
1578 ElaboratedTypeKeyword Keyword
1579 = TypeWithKeyword::getKeywordForTagTypeKind(TagKind
);
1580 QualType ElabType
= Context
.getElaboratedType(Keyword
, /*NNS=*/0, Type
);
1582 return ParsedType::make(ElabType
);
1585 ExprResult
Sema::BuildTemplateIdExpr(const CXXScopeSpec
&SS
,
1588 const TemplateArgumentListInfo
&TemplateArgs
) {
1589 // FIXME: Can we do any checking at this point? I guess we could check the
1590 // template arguments that we have against the template name, if the template
1591 // name refers to a single template. That's not a terribly common case,
1594 // These should be filtered out by our callers.
1595 assert(!R
.empty() && "empty lookup results when building templateid");
1596 assert(!R
.isAmbiguous() && "ambiguous lookup when building templateid");
1598 NestedNameSpecifier
*Qualifier
= 0;
1599 SourceRange QualifierRange
;
1601 Qualifier
= static_cast<NestedNameSpecifier
*>(SS
.getScopeRep());
1602 QualifierRange
= SS
.getRange();
1605 // We don't want lookup warnings at this point.
1606 R
.suppressDiagnostics();
1609 = UnresolvedLookupExpr::ComputeDependence(R
.begin(), R
.end(),
1611 UnresolvedLookupExpr
*ULE
1612 = UnresolvedLookupExpr::Create(Context
, Dependent
, R
.getNamingClass(),
1613 Qualifier
, QualifierRange
,
1614 R
.getLookupNameInfo(),
1615 RequiresADL
, TemplateArgs
,
1616 R
.begin(), R
.end());
1621 // We actually only call this from template instantiation.
1623 Sema::BuildQualifiedTemplateIdExpr(CXXScopeSpec
&SS
,
1624 const DeclarationNameInfo
&NameInfo
,
1625 const TemplateArgumentListInfo
&TemplateArgs
) {
1627 if (!(DC
= computeDeclContext(SS
, false)) ||
1628 DC
->isDependentContext() ||
1629 RequireCompleteDeclContext(SS
, DC
))
1630 return BuildDependentDeclRefExpr(SS
, NameInfo
, &TemplateArgs
);
1632 bool MemberOfUnknownSpecialization
;
1633 LookupResult
R(*this, NameInfo
, LookupOrdinaryName
);
1634 LookupTemplateName(R
, (Scope
*) 0, SS
, QualType(), /*Entering*/ false,
1635 MemberOfUnknownSpecialization
);
1637 if (R
.isAmbiguous())
1641 Diag(NameInfo
.getLoc(), diag::err_template_kw_refers_to_non_template
)
1642 << NameInfo
.getName() << SS
.getRange();
1646 if (ClassTemplateDecl
*Temp
= R
.getAsSingle
<ClassTemplateDecl
>()) {
1647 Diag(NameInfo
.getLoc(), diag::err_template_kw_refers_to_class_template
)
1648 << (NestedNameSpecifier
*) SS
.getScopeRep()
1649 << NameInfo
.getName() << SS
.getRange();
1650 Diag(Temp
->getLocation(), diag::note_referenced_class_template
);
1654 return BuildTemplateIdExpr(SS
, R
, /* ADL */ false, TemplateArgs
);
1657 /// \brief Form a dependent template name.
1659 /// This action forms a dependent template name given the template
1660 /// name and its (presumably dependent) scope specifier. For
1661 /// example, given "MetaFun::template apply", the scope specifier \p
1662 /// SS will be "MetaFun::", \p TemplateKWLoc contains the location
1663 /// of the "template" keyword, and "apply" is the \p Name.
1664 TemplateNameKind
Sema::ActOnDependentTemplateName(Scope
*S
,
1665 SourceLocation TemplateKWLoc
,
1667 UnqualifiedId
&Name
,
1668 ParsedType ObjectType
,
1669 bool EnteringContext
,
1670 TemplateTy
&Result
) {
1671 if (TemplateKWLoc
.isValid() && S
&& !S
->getTemplateParamParent() &&
1672 !getLangOptions().CPlusPlus0x
)
1673 Diag(TemplateKWLoc
, diag::ext_template_outside_of_template
)
1674 << FixItHint::CreateRemoval(TemplateKWLoc
);
1676 DeclContext
*LookupCtx
= 0;
1678 LookupCtx
= computeDeclContext(SS
, EnteringContext
);
1679 if (!LookupCtx
&& ObjectType
)
1680 LookupCtx
= computeDeclContext(ObjectType
.get());
1682 // C++0x [temp.names]p5:
1683 // If a name prefixed by the keyword template is not the name of
1684 // a template, the program is ill-formed. [Note: the keyword
1685 // template may not be applied to non-template members of class
1686 // templates. -end note ] [ Note: as is the case with the
1687 // typename prefix, the template prefix is allowed in cases
1688 // where it is not strictly necessary; i.e., when the
1689 // nested-name-specifier or the expression on the left of the ->
1690 // or . is not dependent on a template-parameter, or the use
1691 // does not appear in the scope of a template. -end note]
1693 // Note: C++03 was more strict here, because it banned the use of
1694 // the "template" keyword prior to a template-name that was not a
1695 // dependent name. C++ DR468 relaxed this requirement (the
1696 // "template" keyword is now permitted). We follow the C++0x
1697 // rules, even in C++03 mode with a warning, retroactively applying the DR.
1698 bool MemberOfUnknownSpecialization
;
1699 TemplateNameKind TNK
= isTemplateName(0, SS
, TemplateKWLoc
.isValid(), Name
,
1700 ObjectType
, EnteringContext
, Result
,
1701 MemberOfUnknownSpecialization
);
1702 if (TNK
== TNK_Non_template
&& LookupCtx
->isDependentContext() &&
1703 isa
<CXXRecordDecl
>(LookupCtx
) &&
1704 cast
<CXXRecordDecl
>(LookupCtx
)->hasAnyDependentBases()) {
1705 // This is a dependent template. Handle it below.
1706 } else if (TNK
== TNK_Non_template
) {
1707 Diag(Name
.getSourceRange().getBegin(),
1708 diag::err_template_kw_refers_to_non_template
)
1709 << GetNameFromUnqualifiedId(Name
).getName()
1710 << Name
.getSourceRange()
1712 return TNK_Non_template
;
1714 // We found something; return it.
1719 NestedNameSpecifier
*Qualifier
1720 = static_cast<NestedNameSpecifier
*>(SS
.getScopeRep());
1722 switch (Name
.getKind()) {
1723 case UnqualifiedId::IK_Identifier
:
1724 Result
= TemplateTy::make(Context
.getDependentTemplateName(Qualifier
,
1726 return TNK_Dependent_template_name
;
1728 case UnqualifiedId::IK_OperatorFunctionId
:
1729 Result
= TemplateTy::make(Context
.getDependentTemplateName(Qualifier
,
1730 Name
.OperatorFunctionId
.Operator
));
1731 return TNK_Dependent_template_name
;
1733 case UnqualifiedId::IK_LiteralOperatorId
:
1734 assert(false && "We don't support these; Parse shouldn't have allowed propagation");
1740 Diag(Name
.getSourceRange().getBegin(),
1741 diag::err_template_kw_refers_to_non_template
)
1742 << GetNameFromUnqualifiedId(Name
).getName()
1743 << Name
.getSourceRange()
1745 return TNK_Non_template
;
1748 bool Sema::CheckTemplateTypeArgument(TemplateTypeParmDecl
*Param
,
1749 const TemplateArgumentLoc
&AL
,
1750 TemplateArgumentListBuilder
&Converted
) {
1751 const TemplateArgument
&Arg
= AL
.getArgument();
1753 // Check template type parameter.
1754 switch(Arg
.getKind()) {
1755 case TemplateArgument::Type
:
1756 // C++ [temp.arg.type]p1:
1757 // A template-argument for a template-parameter which is a
1758 // type shall be a type-id.
1760 case TemplateArgument::Template
: {
1761 // We have a template type parameter but the template argument
1762 // is a template without any arguments.
1763 SourceRange SR
= AL
.getSourceRange();
1764 TemplateName Name
= Arg
.getAsTemplate();
1765 Diag(SR
.getBegin(), diag::err_template_missing_args
)
1767 if (TemplateDecl
*Decl
= Name
.getAsTemplateDecl())
1768 Diag(Decl
->getLocation(), diag::note_template_decl_here
);
1773 // We have a template type parameter but the template argument
1775 SourceRange SR
= AL
.getSourceRange();
1776 Diag(SR
.getBegin(), diag::err_template_arg_must_be_type
) << SR
;
1777 Diag(Param
->getLocation(), diag::note_template_param_here
);
1783 if (CheckTemplateArgument(Param
, AL
.getTypeSourceInfo()))
1786 // Add the converted template type argument.
1788 TemplateArgument(Context
.getCanonicalType(Arg
.getAsType())));
1792 /// \brief Substitute template arguments into the default template argument for
1793 /// the given template type parameter.
1795 /// \param SemaRef the semantic analysis object for which we are performing
1796 /// the substitution.
1798 /// \param Template the template that we are synthesizing template arguments
1801 /// \param TemplateLoc the location of the template name that started the
1802 /// template-id we are checking.
1804 /// \param RAngleLoc the location of the right angle bracket ('>') that
1805 /// terminates the template-id.
1807 /// \param Param the template template parameter whose default we are
1808 /// substituting into.
1810 /// \param Converted the list of template arguments provided for template
1811 /// parameters that precede \p Param in the template parameter list.
1813 /// \returns the substituted template argument, or NULL if an error occurred.
1814 static TypeSourceInfo
*
1815 SubstDefaultTemplateArgument(Sema
&SemaRef
,
1816 TemplateDecl
*Template
,
1817 SourceLocation TemplateLoc
,
1818 SourceLocation RAngleLoc
,
1819 TemplateTypeParmDecl
*Param
,
1820 TemplateArgumentListBuilder
&Converted
) {
1821 TypeSourceInfo
*ArgType
= Param
->getDefaultArgumentInfo();
1823 // If the argument type is dependent, instantiate it now based
1824 // on the previously-computed template arguments.
1825 if (ArgType
->getType()->isDependentType()) {
1826 TemplateArgumentList
TemplateArgs(SemaRef
.Context
, Converted
,
1827 /*TakeArgs=*/false);
1829 MultiLevelTemplateArgumentList AllTemplateArgs
1830 = SemaRef
.getTemplateInstantiationArgs(Template
, &TemplateArgs
);
1832 Sema::InstantiatingTemplate
Inst(SemaRef
, TemplateLoc
,
1833 Template
, Converted
.getFlatArguments(),
1834 Converted
.flatSize(),
1835 SourceRange(TemplateLoc
, RAngleLoc
));
1837 ArgType
= SemaRef
.SubstType(ArgType
, AllTemplateArgs
,
1838 Param
->getDefaultArgumentLoc(),
1839 Param
->getDeclName());
1845 /// \brief Substitute template arguments into the default template argument for
1846 /// the given non-type template parameter.
1848 /// \param SemaRef the semantic analysis object for which we are performing
1849 /// the substitution.
1851 /// \param Template the template that we are synthesizing template arguments
1854 /// \param TemplateLoc the location of the template name that started the
1855 /// template-id we are checking.
1857 /// \param RAngleLoc the location of the right angle bracket ('>') that
1858 /// terminates the template-id.
1860 /// \param Param the non-type template parameter whose default we are
1861 /// substituting into.
1863 /// \param Converted the list of template arguments provided for template
1864 /// parameters that precede \p Param in the template parameter list.
1866 /// \returns the substituted template argument, or NULL if an error occurred.
1868 SubstDefaultTemplateArgument(Sema
&SemaRef
,
1869 TemplateDecl
*Template
,
1870 SourceLocation TemplateLoc
,
1871 SourceLocation RAngleLoc
,
1872 NonTypeTemplateParmDecl
*Param
,
1873 TemplateArgumentListBuilder
&Converted
) {
1874 TemplateArgumentList
TemplateArgs(SemaRef
.Context
, Converted
,
1875 /*TakeArgs=*/false);
1877 MultiLevelTemplateArgumentList AllTemplateArgs
1878 = SemaRef
.getTemplateInstantiationArgs(Template
, &TemplateArgs
);
1880 Sema::InstantiatingTemplate
Inst(SemaRef
, TemplateLoc
,
1881 Template
, Converted
.getFlatArguments(),
1882 Converted
.flatSize(),
1883 SourceRange(TemplateLoc
, RAngleLoc
));
1885 return SemaRef
.SubstExpr(Param
->getDefaultArgument(), AllTemplateArgs
);
1888 /// \brief Substitute template arguments into the default template argument for
1889 /// the given template template parameter.
1891 /// \param SemaRef the semantic analysis object for which we are performing
1892 /// the substitution.
1894 /// \param Template the template that we are synthesizing template arguments
1897 /// \param TemplateLoc the location of the template name that started the
1898 /// template-id we are checking.
1900 /// \param RAngleLoc the location of the right angle bracket ('>') that
1901 /// terminates the template-id.
1903 /// \param Param the template template parameter whose default we are
1904 /// substituting into.
1906 /// \param Converted the list of template arguments provided for template
1907 /// parameters that precede \p Param in the template parameter list.
1909 /// \returns the substituted template argument, or NULL if an error occurred.
1911 SubstDefaultTemplateArgument(Sema
&SemaRef
,
1912 TemplateDecl
*Template
,
1913 SourceLocation TemplateLoc
,
1914 SourceLocation RAngleLoc
,
1915 TemplateTemplateParmDecl
*Param
,
1916 TemplateArgumentListBuilder
&Converted
) {
1917 TemplateArgumentList
TemplateArgs(SemaRef
.Context
, Converted
,
1918 /*TakeArgs=*/false);
1920 MultiLevelTemplateArgumentList AllTemplateArgs
1921 = SemaRef
.getTemplateInstantiationArgs(Template
, &TemplateArgs
);
1923 Sema::InstantiatingTemplate
Inst(SemaRef
, TemplateLoc
,
1924 Template
, Converted
.getFlatArguments(),
1925 Converted
.flatSize(),
1926 SourceRange(TemplateLoc
, RAngleLoc
));
1928 return SemaRef
.SubstTemplateName(
1929 Param
->getDefaultArgument().getArgument().getAsTemplate(),
1930 Param
->getDefaultArgument().getTemplateNameLoc(),
1934 /// \brief If the given template parameter has a default template
1935 /// argument, substitute into that default template argument and
1936 /// return the corresponding template argument.
1938 Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl
*Template
,
1939 SourceLocation TemplateLoc
,
1940 SourceLocation RAngleLoc
,
1942 TemplateArgumentListBuilder
&Converted
) {
1943 if (TemplateTypeParmDecl
*TypeParm
= dyn_cast
<TemplateTypeParmDecl
>(Param
)) {
1944 if (!TypeParm
->hasDefaultArgument())
1945 return TemplateArgumentLoc();
1947 TypeSourceInfo
*DI
= SubstDefaultTemplateArgument(*this, Template
,
1953 return TemplateArgumentLoc(TemplateArgument(DI
->getType()), DI
);
1955 return TemplateArgumentLoc();
1958 if (NonTypeTemplateParmDecl
*NonTypeParm
1959 = dyn_cast
<NonTypeTemplateParmDecl
>(Param
)) {
1960 if (!NonTypeParm
->hasDefaultArgument())
1961 return TemplateArgumentLoc();
1963 ExprResult Arg
= SubstDefaultTemplateArgument(*this, Template
,
1968 if (Arg
.isInvalid())
1969 return TemplateArgumentLoc();
1971 Expr
*ArgE
= Arg
.takeAs
<Expr
>();
1972 return TemplateArgumentLoc(TemplateArgument(ArgE
), ArgE
);
1975 TemplateTemplateParmDecl
*TempTempParm
1976 = cast
<TemplateTemplateParmDecl
>(Param
);
1977 if (!TempTempParm
->hasDefaultArgument())
1978 return TemplateArgumentLoc();
1980 TemplateName TName
= SubstDefaultTemplateArgument(*this, Template
,
1986 return TemplateArgumentLoc();
1988 return TemplateArgumentLoc(TemplateArgument(TName
),
1989 TempTempParm
->getDefaultArgument().getTemplateQualifierRange(),
1990 TempTempParm
->getDefaultArgument().getTemplateNameLoc());
1993 /// \brief Check that the given template argument corresponds to the given
1994 /// template parameter.
1995 bool Sema::CheckTemplateArgument(NamedDecl
*Param
,
1996 const TemplateArgumentLoc
&Arg
,
1997 TemplateDecl
*Template
,
1998 SourceLocation TemplateLoc
,
1999 SourceLocation RAngleLoc
,
2000 TemplateArgumentListBuilder
&Converted
,
2001 CheckTemplateArgumentKind CTAK
) {
2002 // Check template type parameters.
2003 if (TemplateTypeParmDecl
*TTP
= dyn_cast
<TemplateTypeParmDecl
>(Param
))
2004 return CheckTemplateTypeArgument(TTP
, Arg
, Converted
);
2006 // Check non-type template parameters.
2007 if (NonTypeTemplateParmDecl
*NTTP
=dyn_cast
<NonTypeTemplateParmDecl
>(Param
)) {
2008 // Do substitution on the type of the non-type template parameter
2009 // with the template arguments we've seen thus far.
2010 QualType NTTPType
= NTTP
->getType();
2011 if (NTTPType
->isDependentType()) {
2012 // Do substitution on the type of the non-type template parameter.
2013 InstantiatingTemplate
Inst(*this, TemplateLoc
, Template
,
2014 NTTP
, Converted
.getFlatArguments(),
2015 Converted
.flatSize(),
2016 SourceRange(TemplateLoc
, RAngleLoc
));
2018 TemplateArgumentList
TemplateArgs(Context
, Converted
,
2019 /*TakeArgs=*/false);
2020 NTTPType
= SubstType(NTTPType
,
2021 MultiLevelTemplateArgumentList(TemplateArgs
),
2022 NTTP
->getLocation(),
2023 NTTP
->getDeclName());
2024 // If that worked, check the non-type template parameter type
2026 if (!NTTPType
.isNull())
2027 NTTPType
= CheckNonTypeTemplateParameterType(NTTPType
,
2028 NTTP
->getLocation());
2029 if (NTTPType
.isNull())
2033 switch (Arg
.getArgument().getKind()) {
2034 case TemplateArgument::Null
:
2035 assert(false && "Should never see a NULL template argument here");
2038 case TemplateArgument::Expression
: {
2039 Expr
*E
= Arg
.getArgument().getAsExpr();
2040 TemplateArgument Result
;
2041 if (CheckTemplateArgument(NTTP
, NTTPType
, E
, Result
, CTAK
))
2044 Converted
.Append(Result
);
2048 case TemplateArgument::Declaration
:
2049 case TemplateArgument::Integral
:
2050 // We've already checked this template argument, so just copy
2051 // it to the list of converted arguments.
2052 Converted
.Append(Arg
.getArgument());
2055 case TemplateArgument::Template
:
2056 // We were given a template template argument. It may not be ill-formed;
2058 if (DependentTemplateName
*DTN
2059 = Arg
.getArgument().getAsTemplate().getAsDependentTemplateName()) {
2060 // We have a template argument such as \c T::template X, which we
2061 // parsed as a template template argument. However, since we now
2062 // know that we need a non-type template argument, convert this
2063 // template name into an expression.
2065 DeclarationNameInfo
NameInfo(DTN
->getIdentifier(),
2066 Arg
.getTemplateNameLoc());
2068 Expr
*E
= DependentScopeDeclRefExpr::Create(Context
,
2069 DTN
->getQualifier(),
2070 Arg
.getTemplateQualifierRange(),
2073 TemplateArgument Result
;
2074 if (CheckTemplateArgument(NTTP
, NTTPType
, E
, Result
))
2077 Converted
.Append(Result
);
2081 // We have a template argument that actually does refer to a class
2082 // template, template alias, or template template parameter, and
2083 // therefore cannot be a non-type template argument.
2084 Diag(Arg
.getLocation(), diag::err_template_arg_must_be_expr
)
2085 << Arg
.getSourceRange();
2087 Diag(Param
->getLocation(), diag::note_template_param_here
);
2090 case TemplateArgument::Type
: {
2091 // We have a non-type template parameter but the template
2092 // argument is a type.
2094 // C++ [temp.arg]p2:
2095 // In a template-argument, an ambiguity between a type-id and
2096 // an expression is resolved to a type-id, regardless of the
2097 // form of the corresponding template-parameter.
2099 // We warn specifically about this case, since it can be rather
2100 // confusing for users.
2101 QualType T
= Arg
.getArgument().getAsType();
2102 SourceRange SR
= Arg
.getSourceRange();
2103 if (T
->isFunctionType())
2104 Diag(SR
.getBegin(), diag::err_template_arg_nontype_ambig
) << SR
<< T
;
2106 Diag(SR
.getBegin(), diag::err_template_arg_must_be_expr
) << SR
;
2107 Diag(Param
->getLocation(), diag::note_template_param_here
);
2111 case TemplateArgument::Pack
:
2112 llvm_unreachable("Caller must expand template argument packs");
2120 // Check template template parameters.
2121 TemplateTemplateParmDecl
*TempParm
= cast
<TemplateTemplateParmDecl
>(Param
);
2123 // Substitute into the template parameter list of the template
2124 // template parameter, since previously-supplied template arguments
2125 // may appear within the template template parameter.
2127 // Set up a template instantiation context.
2128 LocalInstantiationScope
Scope(*this);
2129 InstantiatingTemplate
Inst(*this, TemplateLoc
, Template
,
2130 TempParm
, Converted
.getFlatArguments(),
2131 Converted
.flatSize(),
2132 SourceRange(TemplateLoc
, RAngleLoc
));
2134 TemplateArgumentList
TemplateArgs(Context
, Converted
,
2135 /*TakeArgs=*/false);
2136 TempParm
= cast_or_null
<TemplateTemplateParmDecl
>(
2137 SubstDecl(TempParm
, CurContext
,
2138 MultiLevelTemplateArgumentList(TemplateArgs
)));
2142 // FIXME: TempParam is leaked.
2145 switch (Arg
.getArgument().getKind()) {
2146 case TemplateArgument::Null
:
2147 assert(false && "Should never see a NULL template argument here");
2150 case TemplateArgument::Template
:
2151 if (CheckTemplateArgument(TempParm
, Arg
))
2154 Converted
.Append(Arg
.getArgument());
2157 case TemplateArgument::Expression
:
2158 case TemplateArgument::Type
:
2159 // We have a template template parameter but the template
2160 // argument does not refer to a template.
2161 Diag(Arg
.getLocation(), diag::err_template_arg_must_be_template
);
2164 case TemplateArgument::Declaration
:
2166 "Declaration argument with template template parameter");
2168 case TemplateArgument::Integral
:
2170 "Integral argument with template template parameter");
2173 case TemplateArgument::Pack
:
2174 llvm_unreachable("Caller must expand template argument packs");
2181 /// \brief Check that the given template argument list is well-formed
2182 /// for specializing the given template.
2183 bool Sema::CheckTemplateArgumentList(TemplateDecl
*Template
,
2184 SourceLocation TemplateLoc
,
2185 const TemplateArgumentListInfo
&TemplateArgs
,
2186 bool PartialTemplateArgs
,
2187 TemplateArgumentListBuilder
&Converted
) {
2188 TemplateParameterList
*Params
= Template
->getTemplateParameters();
2189 unsigned NumParams
= Params
->size();
2190 unsigned NumArgs
= TemplateArgs
.size();
2191 bool Invalid
= false;
2193 SourceLocation RAngleLoc
= TemplateArgs
.getRAngleLoc();
2195 bool HasParameterPack
=
2196 NumParams
> 0 && Params
->getParam(NumParams
- 1)->isTemplateParameterPack();
2198 if ((NumArgs
> NumParams
&& !HasParameterPack
) ||
2199 (NumArgs
< Params
->getMinRequiredArguments() &&
2200 !PartialTemplateArgs
)) {
2201 // FIXME: point at either the first arg beyond what we can handle,
2202 // or the '>', depending on whether we have too many or too few
2205 if (NumArgs
> NumParams
)
2206 Range
= SourceRange(TemplateArgs
[NumParams
].getLocation(), RAngleLoc
);
2207 Diag(TemplateLoc
, diag::err_template_arg_list_different_arity
)
2208 << (NumArgs
> NumParams
)
2209 << (isa
<ClassTemplateDecl
>(Template
)? 0 :
2210 isa
<FunctionTemplateDecl
>(Template
)? 1 :
2211 isa
<TemplateTemplateParmDecl
>(Template
)? 2 : 3)
2212 << Template
<< Range
;
2213 Diag(Template
->getLocation(), diag::note_template_decl_here
)
2214 << Params
->getSourceRange();
2218 // C++ [temp.arg]p1:
2219 // [...] The type and form of each template-argument specified in
2220 // a template-id shall match the type and form specified for the
2221 // corresponding parameter declared by the template in its
2222 // template-parameter-list.
2223 unsigned ArgIdx
= 0;
2224 for (TemplateParameterList::iterator Param
= Params
->begin(),
2225 ParamEnd
= Params
->end();
2226 Param
!= ParamEnd
; ++Param
, ++ArgIdx
) {
2227 if (ArgIdx
> NumArgs
&& PartialTemplateArgs
)
2230 // If we have a template parameter pack, check every remaining template
2231 // argument against that template parameter pack.
2232 if ((*Param
)->isTemplateParameterPack()) {
2233 Converted
.BeginPack();
2234 for (; ArgIdx
< NumArgs
; ++ArgIdx
) {
2235 if (CheckTemplateArgument(*Param
, TemplateArgs
[ArgIdx
], Template
,
2236 TemplateLoc
, RAngleLoc
, Converted
)) {
2241 Converted
.EndPack();
2245 if (ArgIdx
< NumArgs
) {
2246 // Check the template argument we were given.
2247 if (CheckTemplateArgument(*Param
, TemplateArgs
[ArgIdx
], Template
,
2248 TemplateLoc
, RAngleLoc
, Converted
))
2254 // We have a default template argument that we will use.
2255 TemplateArgumentLoc Arg
;
2257 // Retrieve the default template argument from the template
2258 // parameter. For each kind of template parameter, we substitute the
2259 // template arguments provided thus far and any "outer" template arguments
2260 // (when the template parameter was part of a nested template) into
2261 // the default argument.
2262 if (TemplateTypeParmDecl
*TTP
= dyn_cast
<TemplateTypeParmDecl
>(*Param
)) {
2263 if (!TTP
->hasDefaultArgument()) {
2264 assert((Invalid
|| PartialTemplateArgs
) && "Missing default argument");
2268 TypeSourceInfo
*ArgType
= SubstDefaultTemplateArgument(*this,
2277 Arg
= TemplateArgumentLoc(TemplateArgument(ArgType
->getType()),
2279 } else if (NonTypeTemplateParmDecl
*NTTP
2280 = dyn_cast
<NonTypeTemplateParmDecl
>(*Param
)) {
2281 if (!NTTP
->hasDefaultArgument()) {
2282 assert((Invalid
|| PartialTemplateArgs
) && "Missing default argument");
2286 ExprResult E
= SubstDefaultTemplateArgument(*this, Template
,
2294 Expr
*Ex
= E
.takeAs
<Expr
>();
2295 Arg
= TemplateArgumentLoc(TemplateArgument(Ex
), Ex
);
2297 TemplateTemplateParmDecl
*TempParm
2298 = cast
<TemplateTemplateParmDecl
>(*Param
);
2300 if (!TempParm
->hasDefaultArgument()) {
2301 assert((Invalid
|| PartialTemplateArgs
) && "Missing default argument");
2305 TemplateName Name
= SubstDefaultTemplateArgument(*this, Template
,
2313 Arg
= TemplateArgumentLoc(TemplateArgument(Name
),
2314 TempParm
->getDefaultArgument().getTemplateQualifierRange(),
2315 TempParm
->getDefaultArgument().getTemplateNameLoc());
2318 // Introduce an instantiation record that describes where we are using
2319 // the default template argument.
2320 InstantiatingTemplate
Instantiating(*this, RAngleLoc
, Template
, *Param
,
2321 Converted
.getFlatArguments(),
2322 Converted
.flatSize(),
2323 SourceRange(TemplateLoc
, RAngleLoc
));
2325 // Check the default template argument.
2326 if (CheckTemplateArgument(*Param
, Arg
, Template
, TemplateLoc
,
2327 RAngleLoc
, Converted
))
2334 /// \brief Check a template argument against its corresponding
2335 /// template type parameter.
2337 /// This routine implements the semantics of C++ [temp.arg.type]. It
2338 /// returns true if an error occurred, and false otherwise.
2339 bool Sema::CheckTemplateArgument(TemplateTypeParmDecl
*Param
,
2340 TypeSourceInfo
*ArgInfo
) {
2341 assert(ArgInfo
&& "invalid TypeSourceInfo");
2342 QualType Arg
= ArgInfo
->getType();
2344 // C++ [temp.arg.type]p2:
2345 // A local type, a type with no linkage, an unnamed type or a type
2346 // compounded from any of these types shall not be used as a
2347 // template-argument for a template type-parameter.
2349 // FIXME: Perform the unnamed type check.
2350 SourceRange SR
= ArgInfo
->getTypeLoc().getSourceRange();
2351 const TagType
*Tag
= 0;
2352 if (const EnumType
*EnumT
= Arg
->getAs
<EnumType
>())
2354 else if (const RecordType
*RecordT
= Arg
->getAs
<RecordType
>())
2356 if (Tag
&& Tag
->getDecl()->getDeclContext()->isFunctionOrMethod()) {
2357 SourceRange SR
= ArgInfo
->getTypeLoc().getSourceRange();
2358 return Diag(SR
.getBegin(), diag::err_template_arg_local_type
)
2359 << QualType(Tag
, 0) << SR
;
2360 } else if (Tag
&& !Tag
->getDecl()->getDeclName() &&
2361 !Tag
->getDecl()->getTypedefForAnonDecl()) {
2362 Diag(SR
.getBegin(), diag::err_template_arg_unnamed_type
) << SR
;
2363 Diag(Tag
->getDecl()->getLocation(), diag::note_template_unnamed_type_here
);
2365 } else if (Arg
->isVariablyModifiedType()) {
2366 Diag(SR
.getBegin(), diag::err_variably_modified_template_arg
)
2369 } else if (Context
.hasSameUnqualifiedType(Arg
, Context
.OverloadTy
)) {
2370 return Diag(SR
.getBegin(), diag::err_template_arg_overload_type
) << SR
;
2376 /// \brief Checks whether the given template argument is the address
2377 /// of an object or function according to C++ [temp.arg.nontype]p1.
2379 CheckTemplateArgumentAddressOfObjectOrFunction(Sema
&S
,
2380 NonTypeTemplateParmDecl
*Param
,
2383 TemplateArgument
&Converted
) {
2384 bool Invalid
= false;
2386 QualType ArgType
= Arg
->getType();
2388 // See through any implicit casts we added to fix the type.
2389 while (ImplicitCastExpr
*Cast
= dyn_cast
<ImplicitCastExpr
>(Arg
))
2390 Arg
= Cast
->getSubExpr();
2392 // C++ [temp.arg.nontype]p1:
2394 // A template-argument for a non-type, non-template
2395 // template-parameter shall be one of: [...]
2397 // -- the address of an object or function with external
2398 // linkage, including function templates and function
2399 // template-ids but excluding non-static class members,
2400 // expressed as & id-expression where the & is optional if
2401 // the name refers to a function or array, or if the
2402 // corresponding template-parameter is a reference; or
2403 DeclRefExpr
*DRE
= 0;
2405 // Ignore (and complain about) any excess parentheses.
2406 while (ParenExpr
*Parens
= dyn_cast
<ParenExpr
>(Arg
)) {
2408 S
.Diag(Arg
->getSourceRange().getBegin(),
2409 diag::err_template_arg_extra_parens
)
2410 << Arg
->getSourceRange();
2414 Arg
= Parens
->getSubExpr();
2417 bool AddressTaken
= false;
2418 SourceLocation AddrOpLoc
;
2419 if (UnaryOperator
*UnOp
= dyn_cast
<UnaryOperator
>(Arg
)) {
2420 if (UnOp
->getOpcode() == UO_AddrOf
) {
2421 DRE
= dyn_cast
<DeclRefExpr
>(UnOp
->getSubExpr());
2422 AddressTaken
= true;
2423 AddrOpLoc
= UnOp
->getOperatorLoc();
2426 DRE
= dyn_cast
<DeclRefExpr
>(Arg
);
2429 S
.Diag(Arg
->getLocStart(), diag::err_template_arg_not_decl_ref
)
2430 << Arg
->getSourceRange();
2431 S
.Diag(Param
->getLocation(), diag::note_template_param_here
);
2435 // Stop checking the precise nature of the argument if it is value dependent,
2436 // it should be checked when instantiated.
2437 if (Arg
->isValueDependent()) {
2438 Converted
= TemplateArgument(ArgIn
->Retain());
2442 if (!isa
<ValueDecl
>(DRE
->getDecl())) {
2443 S
.Diag(Arg
->getSourceRange().getBegin(),
2444 diag::err_template_arg_not_object_or_func_form
)
2445 << Arg
->getSourceRange();
2446 S
.Diag(Param
->getLocation(), diag::note_template_param_here
);
2450 NamedDecl
*Entity
= 0;
2452 // Cannot refer to non-static data members
2453 if (FieldDecl
*Field
= dyn_cast
<FieldDecl
>(DRE
->getDecl())) {
2454 S
.Diag(Arg
->getSourceRange().getBegin(), diag::err_template_arg_field
)
2455 << Field
<< Arg
->getSourceRange();
2456 S
.Diag(Param
->getLocation(), diag::note_template_param_here
);
2460 // Cannot refer to non-static member functions
2461 if (CXXMethodDecl
*Method
= dyn_cast
<CXXMethodDecl
>(DRE
->getDecl()))
2462 if (!Method
->isStatic()) {
2463 S
.Diag(Arg
->getSourceRange().getBegin(), diag::err_template_arg_method
)
2464 << Method
<< Arg
->getSourceRange();
2465 S
.Diag(Param
->getLocation(), diag::note_template_param_here
);
2469 // Functions must have external linkage.
2470 if (FunctionDecl
*Func
= dyn_cast
<FunctionDecl
>(DRE
->getDecl())) {
2471 if (!isExternalLinkage(Func
->getLinkage())) {
2472 S
.Diag(Arg
->getSourceRange().getBegin(),
2473 diag::err_template_arg_function_not_extern
)
2474 << Func
<< Arg
->getSourceRange();
2475 S
.Diag(Func
->getLocation(), diag::note_template_arg_internal_object
)
2480 // Okay: we've named a function with external linkage.
2483 // If the template parameter has pointer type, the function decays.
2484 if (ParamType
->isPointerType() && !AddressTaken
)
2485 ArgType
= S
.Context
.getPointerType(Func
->getType());
2486 else if (AddressTaken
&& ParamType
->isReferenceType()) {
2487 // If we originally had an address-of operator, but the
2488 // parameter has reference type, complain and (if things look
2489 // like they will work) drop the address-of operator.
2490 if (!S
.Context
.hasSameUnqualifiedType(Func
->getType(),
2491 ParamType
.getNonReferenceType())) {
2492 S
.Diag(AddrOpLoc
, diag::err_template_arg_address_of_non_pointer
)
2494 S
.Diag(Param
->getLocation(), diag::note_template_param_here
);
2498 S
.Diag(AddrOpLoc
, diag::err_template_arg_address_of_non_pointer
)
2500 << FixItHint::CreateRemoval(AddrOpLoc
);
2501 S
.Diag(Param
->getLocation(), diag::note_template_param_here
);
2503 ArgType
= Func
->getType();
2505 } else if (VarDecl
*Var
= dyn_cast
<VarDecl
>(DRE
->getDecl())) {
2506 if (!isExternalLinkage(Var
->getLinkage())) {
2507 S
.Diag(Arg
->getSourceRange().getBegin(),
2508 diag::err_template_arg_object_not_extern
)
2509 << Var
<< Arg
->getSourceRange();
2510 S
.Diag(Var
->getLocation(), diag::note_template_arg_internal_object
)
2515 // A value of reference type is not an object.
2516 if (Var
->getType()->isReferenceType()) {
2517 S
.Diag(Arg
->getSourceRange().getBegin(),
2518 diag::err_template_arg_reference_var
)
2519 << Var
->getType() << Arg
->getSourceRange();
2520 S
.Diag(Param
->getLocation(), diag::note_template_param_here
);
2524 // Okay: we've named an object with external linkage
2527 // If the template parameter has pointer type, we must have taken
2528 // the address of this object.
2529 if (ParamType
->isReferenceType()) {
2531 // If we originally had an address-of operator, but the
2532 // parameter has reference type, complain and (if things look
2533 // like they will work) drop the address-of operator.
2534 if (!S
.Context
.hasSameUnqualifiedType(Var
->getType(),
2535 ParamType
.getNonReferenceType())) {
2536 S
.Diag(AddrOpLoc
, diag::err_template_arg_address_of_non_pointer
)
2538 S
.Diag(Param
->getLocation(), diag::note_template_param_here
);
2542 S
.Diag(AddrOpLoc
, diag::err_template_arg_address_of_non_pointer
)
2544 << FixItHint::CreateRemoval(AddrOpLoc
);
2545 S
.Diag(Param
->getLocation(), diag::note_template_param_here
);
2547 ArgType
= Var
->getType();
2549 } else if (!AddressTaken
&& ParamType
->isPointerType()) {
2550 if (Var
->getType()->isArrayType()) {
2551 // Array-to-pointer decay.
2552 ArgType
= S
.Context
.getArrayDecayedType(Var
->getType());
2554 // If the template parameter has pointer type but the address of
2555 // this object was not taken, complain and (possibly) recover by
2556 // taking the address of the entity.
2557 ArgType
= S
.Context
.getPointerType(Var
->getType());
2558 if (!S
.Context
.hasSameUnqualifiedType(ArgType
, ParamType
)) {
2559 S
.Diag(Arg
->getLocStart(), diag::err_template_arg_not_address_of
)
2561 S
.Diag(Param
->getLocation(), diag::note_template_param_here
);
2565 S
.Diag(Arg
->getLocStart(), diag::err_template_arg_not_address_of
)
2567 << FixItHint::CreateInsertion(Arg
->getLocStart(), "&");
2569 S
.Diag(Param
->getLocation(), diag::note_template_param_here
);
2573 // We found something else, but we don't know specifically what it is.
2574 S
.Diag(Arg
->getSourceRange().getBegin(),
2575 diag::err_template_arg_not_object_or_func
)
2576 << Arg
->getSourceRange();
2577 S
.Diag(DRE
->getDecl()->getLocation(), diag::note_template_arg_refers_here
);
2581 if (ParamType
->isPointerType() &&
2582 !ParamType
->getAs
<PointerType
>()->getPointeeType()->isFunctionType() &&
2583 S
.IsQualificationConversion(ArgType
, ParamType
)) {
2584 // For pointer-to-object types, qualification conversions are
2587 if (const ReferenceType
*ParamRef
= ParamType
->getAs
<ReferenceType
>()) {
2588 if (!ParamRef
->getPointeeType()->isFunctionType()) {
2589 // C++ [temp.arg.nontype]p5b3:
2590 // For a non-type template-parameter of type reference to
2591 // object, no conversions apply. The type referred to by the
2592 // reference may be more cv-qualified than the (otherwise
2593 // identical) type of the template- argument. The
2594 // template-parameter is bound directly to the
2595 // template-argument, which shall be an lvalue.
2597 // FIXME: Other qualifiers?
2598 unsigned ParamQuals
= ParamRef
->getPointeeType().getCVRQualifiers();
2599 unsigned ArgQuals
= ArgType
.getCVRQualifiers();
2601 if ((ParamQuals
| ArgQuals
) != ParamQuals
) {
2602 S
.Diag(Arg
->getSourceRange().getBegin(),
2603 diag::err_template_arg_ref_bind_ignores_quals
)
2604 << ParamType
<< Arg
->getType()
2605 << Arg
->getSourceRange();
2606 S
.Diag(Param
->getLocation(), diag::note_template_param_here
);
2612 // At this point, the template argument refers to an object or
2613 // function with external linkage. We now need to check whether the
2614 // argument and parameter types are compatible.
2615 if (!S
.Context
.hasSameUnqualifiedType(ArgType
,
2616 ParamType
.getNonReferenceType())) {
2617 // We can't perform this conversion or binding.
2618 if (ParamType
->isReferenceType())
2619 S
.Diag(Arg
->getLocStart(), diag::err_template_arg_no_ref_bind
)
2620 << ParamType
<< Arg
->getType() << Arg
->getSourceRange();
2622 S
.Diag(Arg
->getLocStart(), diag::err_template_arg_not_convertible
)
2623 << Arg
->getType() << ParamType
<< Arg
->getSourceRange();
2624 S
.Diag(Param
->getLocation(), diag::note_template_param_here
);
2629 // Create the template argument.
2630 Converted
= TemplateArgument(Entity
->getCanonicalDecl());
2631 S
.MarkDeclarationReferenced(Arg
->getLocStart(), Entity
);
2635 /// \brief Checks whether the given template argument is a pointer to
2636 /// member constant according to C++ [temp.arg.nontype]p1.
2637 bool Sema::CheckTemplateArgumentPointerToMember(Expr
*Arg
,
2638 TemplateArgument
&Converted
) {
2639 bool Invalid
= false;
2641 // See through any implicit casts we added to fix the type.
2642 while (ImplicitCastExpr
*Cast
= dyn_cast
<ImplicitCastExpr
>(Arg
))
2643 Arg
= Cast
->getSubExpr();
2645 // C++ [temp.arg.nontype]p1:
2647 // A template-argument for a non-type, non-template
2648 // template-parameter shall be one of: [...]
2650 // -- a pointer to member expressed as described in 5.3.1.
2651 DeclRefExpr
*DRE
= 0;
2653 // Ignore (and complain about) any excess parentheses.
2654 while (ParenExpr
*Parens
= dyn_cast
<ParenExpr
>(Arg
)) {
2656 Diag(Arg
->getSourceRange().getBegin(),
2657 diag::err_template_arg_extra_parens
)
2658 << Arg
->getSourceRange();
2662 Arg
= Parens
->getSubExpr();
2665 // A pointer-to-member constant written &Class::member.
2666 if (UnaryOperator
*UnOp
= dyn_cast
<UnaryOperator
>(Arg
)) {
2667 if (UnOp
->getOpcode() == UO_AddrOf
) {
2668 DRE
= dyn_cast
<DeclRefExpr
>(UnOp
->getSubExpr());
2669 if (DRE
&& !DRE
->getQualifier())
2673 // A constant of pointer-to-member type.
2674 else if ((DRE
= dyn_cast
<DeclRefExpr
>(Arg
))) {
2675 if (ValueDecl
*VD
= dyn_cast
<ValueDecl
>(DRE
->getDecl())) {
2676 if (VD
->getType()->isMemberPointerType()) {
2677 if (isa
<NonTypeTemplateParmDecl
>(VD
) ||
2678 (isa
<VarDecl
>(VD
) &&
2679 Context
.getCanonicalType(VD
->getType()).isConstQualified())) {
2680 if (Arg
->isTypeDependent() || Arg
->isValueDependent())
2681 Converted
= TemplateArgument(Arg
->Retain());
2683 Converted
= TemplateArgument(VD
->getCanonicalDecl());
2693 return Diag(Arg
->getSourceRange().getBegin(),
2694 diag::err_template_arg_not_pointer_to_member_form
)
2695 << Arg
->getSourceRange();
2697 if (isa
<FieldDecl
>(DRE
->getDecl()) || isa
<CXXMethodDecl
>(DRE
->getDecl())) {
2698 assert((isa
<FieldDecl
>(DRE
->getDecl()) ||
2699 !cast
<CXXMethodDecl
>(DRE
->getDecl())->isStatic()) &&
2700 "Only non-static member pointers can make it here");
2702 // Okay: this is the address of a non-static member, and therefore
2703 // a member pointer constant.
2704 if (Arg
->isTypeDependent() || Arg
->isValueDependent())
2705 Converted
= TemplateArgument(Arg
->Retain());
2707 Converted
= TemplateArgument(DRE
->getDecl()->getCanonicalDecl());
2711 // We found something else, but we don't know specifically what it is.
2712 Diag(Arg
->getSourceRange().getBegin(),
2713 diag::err_template_arg_not_pointer_to_member_form
)
2714 << Arg
->getSourceRange();
2715 Diag(DRE
->getDecl()->getLocation(),
2716 diag::note_template_arg_refers_here
);
2720 /// \brief Check a template argument against its corresponding
2721 /// non-type template parameter.
2723 /// This routine implements the semantics of C++ [temp.arg.nontype].
2724 /// It returns true if an error occurred, and false otherwise. \p
2725 /// InstantiatedParamType is the type of the non-type template
2726 /// parameter after it has been instantiated.
2728 /// If no error was detected, Converted receives the converted template argument.
2729 bool Sema::CheckTemplateArgument(NonTypeTemplateParmDecl
*Param
,
2730 QualType InstantiatedParamType
, Expr
*&Arg
,
2731 TemplateArgument
&Converted
,
2732 CheckTemplateArgumentKind CTAK
) {
2733 SourceLocation StartLoc
= Arg
->getSourceRange().getBegin();
2735 // If either the parameter has a dependent type or the argument is
2736 // type-dependent, there's nothing we can check now.
2737 if (InstantiatedParamType
->isDependentType() || Arg
->isTypeDependent()) {
2738 // FIXME: Produce a cloned, canonical expression?
2739 Converted
= TemplateArgument(Arg
);
2743 // C++ [temp.arg.nontype]p5:
2744 // The following conversions are performed on each expression used
2745 // as a non-type template-argument. If a non-type
2746 // template-argument cannot be converted to the type of the
2747 // corresponding template-parameter then the program is
2750 // -- for a non-type template-parameter of integral or
2751 // enumeration type, integral promotions (4.5) and integral
2752 // conversions (4.7) are applied.
2753 QualType ParamType
= InstantiatedParamType
;
2754 QualType ArgType
= Arg
->getType();
2755 if (ParamType
->isIntegralOrEnumerationType()) {
2756 // C++ [temp.arg.nontype]p1:
2757 // A template-argument for a non-type, non-template
2758 // template-parameter shall be one of:
2760 // -- an integral constant-expression of integral or enumeration
2762 // -- the name of a non-type template-parameter; or
2763 SourceLocation NonConstantLoc
;
2765 if (!ArgType
->isIntegralOrEnumerationType()) {
2766 Diag(Arg
->getSourceRange().getBegin(),
2767 diag::err_template_arg_not_integral_or_enumeral
)
2768 << ArgType
<< Arg
->getSourceRange();
2769 Diag(Param
->getLocation(), diag::note_template_param_here
);
2771 } else if (!Arg
->isValueDependent() &&
2772 !Arg
->isIntegerConstantExpr(Value
, Context
, &NonConstantLoc
)) {
2773 Diag(NonConstantLoc
, diag::err_template_arg_not_ice
)
2774 << ArgType
<< Arg
->getSourceRange();
2778 // From here on out, all we care about are the unqualified forms
2779 // of the parameter and argument types.
2780 ParamType
= ParamType
.getUnqualifiedType();
2781 ArgType
= ArgType
.getUnqualifiedType();
2783 // Try to convert the argument to the parameter's type.
2784 if (Context
.hasSameType(ParamType
, ArgType
)) {
2785 // Okay: no conversion necessary
2786 } else if (CTAK
== CTAK_Deduced
) {
2787 // C++ [temp.deduct.type]p17:
2788 // If, in the declaration of a function template with a non-type
2789 // template-parameter, the non-type template- parameter is used
2790 // in an expression in the function parameter-list and, if the
2791 // corresponding template-argument is deduced, the
2792 // template-argument type shall match the type of the
2793 // template-parameter exactly, except that a template-argument
2794 // deduced from an array bound may be of any integral type.
2795 Diag(StartLoc
, diag::err_deduced_non_type_template_arg_type_mismatch
)
2796 << ArgType
<< ParamType
;
2797 Diag(Param
->getLocation(), diag::note_template_param_here
);
2799 } else if (IsIntegralPromotion(Arg
, ArgType
, ParamType
) ||
2800 !ParamType
->isEnumeralType()) {
2801 // This is an integral promotion or conversion.
2802 ImpCastExprToType(Arg
, ParamType
, CK_IntegralCast
);
2804 // We can't perform this conversion.
2805 Diag(Arg
->getSourceRange().getBegin(),
2806 diag::err_template_arg_not_convertible
)
2807 << Arg
->getType() << InstantiatedParamType
<< Arg
->getSourceRange();
2808 Diag(Param
->getLocation(), diag::note_template_param_here
);
2812 QualType IntegerType
= Context
.getCanonicalType(ParamType
);
2813 if (const EnumType
*Enum
= IntegerType
->getAs
<EnumType
>())
2814 IntegerType
= Context
.getCanonicalType(Enum
->getDecl()->getIntegerType());
2816 if (!Arg
->isValueDependent()) {
2817 llvm::APSInt OldValue
= Value
;
2819 // Coerce the template argument's value to the value it will have
2820 // based on the template parameter's type.
2821 unsigned AllowedBits
= Context
.getTypeSize(IntegerType
);
2822 if (Value
.getBitWidth() != AllowedBits
)
2823 Value
.extOrTrunc(AllowedBits
);
2824 Value
.setIsSigned(IntegerType
->isSignedIntegerType());
2826 // Complain if an unsigned parameter received a negative value.
2827 if (IntegerType
->isUnsignedIntegerType()
2828 && (OldValue
.isSigned() && OldValue
.isNegative())) {
2829 Diag(Arg
->getSourceRange().getBegin(), diag::warn_template_arg_negative
)
2830 << OldValue
.toString(10) << Value
.toString(10) << Param
->getType()
2831 << Arg
->getSourceRange();
2832 Diag(Param
->getLocation(), diag::note_template_param_here
);
2835 // Complain if we overflowed the template parameter's type.
2836 unsigned RequiredBits
;
2837 if (IntegerType
->isUnsignedIntegerType())
2838 RequiredBits
= OldValue
.getActiveBits();
2839 else if (OldValue
.isUnsigned())
2840 RequiredBits
= OldValue
.getActiveBits() + 1;
2842 RequiredBits
= OldValue
.getMinSignedBits();
2843 if (RequiredBits
> AllowedBits
) {
2844 Diag(Arg
->getSourceRange().getBegin(),
2845 diag::warn_template_arg_too_large
)
2846 << OldValue
.toString(10) << Value
.toString(10) << Param
->getType()
2847 << Arg
->getSourceRange();
2848 Diag(Param
->getLocation(), diag::note_template_param_here
);
2852 // Add the value of this argument to the list of converted
2853 // arguments. We use the bitwidth and signedness of the template
2855 if (Arg
->isValueDependent()) {
2856 // The argument is value-dependent. Create a new
2857 // TemplateArgument with the converted expression.
2858 Converted
= TemplateArgument(Arg
);
2862 Converted
= TemplateArgument(Value
,
2863 ParamType
->isEnumeralType() ? ParamType
2868 DeclAccessPair FoundResult
; // temporary for ResolveOverloadedFunction
2870 // C++0x [temp.arg.nontype]p5 bullets 2, 4 and 6 permit conversion
2871 // from a template argument of type std::nullptr_t to a non-type
2872 // template parameter of type pointer to object, pointer to
2873 // function, or pointer-to-member, respectively.
2874 if (ArgType
->isNullPtrType() &&
2875 (ParamType
->isPointerType() || ParamType
->isMemberPointerType())) {
2876 Converted
= TemplateArgument((NamedDecl
*)0);
2880 // Handle pointer-to-function, reference-to-function, and
2881 // pointer-to-member-function all in (roughly) the same way.
2882 if (// -- For a non-type template-parameter of type pointer to
2883 // function, only the function-to-pointer conversion (4.3) is
2884 // applied. If the template-argument represents a set of
2885 // overloaded functions (or a pointer to such), the matching
2886 // function is selected from the set (13.4).
2887 (ParamType
->isPointerType() &&
2888 ParamType
->getAs
<PointerType
>()->getPointeeType()->isFunctionType()) ||
2889 // -- For a non-type template-parameter of type reference to
2890 // function, no conversions apply. If the template-argument
2891 // represents a set of overloaded functions, the matching
2892 // function is selected from the set (13.4).
2893 (ParamType
->isReferenceType() &&
2894 ParamType
->getAs
<ReferenceType
>()->getPointeeType()->isFunctionType()) ||
2895 // -- For a non-type template-parameter of type pointer to
2896 // member function, no conversions apply. If the
2897 // template-argument represents a set of overloaded member
2898 // functions, the matching member function is selected from
2900 (ParamType
->isMemberPointerType() &&
2901 ParamType
->getAs
<MemberPointerType
>()->getPointeeType()
2902 ->isFunctionType())) {
2904 if (Arg
->getType() == Context
.OverloadTy
) {
2905 if (FunctionDecl
*Fn
= ResolveAddressOfOverloadedFunction(Arg
, ParamType
,
2908 if (DiagnoseUseOfDecl(Fn
, Arg
->getSourceRange().getBegin()))
2911 Arg
= FixOverloadedFunctionReference(Arg
, FoundResult
, Fn
);
2912 ArgType
= Arg
->getType();
2917 if (!ParamType
->isMemberPointerType())
2918 return CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param
,
2922 if (IsQualificationConversion(ArgType
, ParamType
.getNonReferenceType())) {
2923 ImpCastExprToType(Arg
, ParamType
, CK_NoOp
, CastCategory(Arg
));
2924 } else if (!Context
.hasSameUnqualifiedType(ArgType
,
2925 ParamType
.getNonReferenceType())) {
2926 // We can't perform this conversion.
2927 Diag(Arg
->getSourceRange().getBegin(),
2928 diag::err_template_arg_not_convertible
)
2929 << Arg
->getType() << InstantiatedParamType
<< Arg
->getSourceRange();
2930 Diag(Param
->getLocation(), diag::note_template_param_here
);
2934 return CheckTemplateArgumentPointerToMember(Arg
, Converted
);
2937 if (ParamType
->isPointerType()) {
2938 // -- for a non-type template-parameter of type pointer to
2939 // object, qualification conversions (4.4) and the
2940 // array-to-pointer conversion (4.2) are applied.
2941 // C++0x also allows a value of std::nullptr_t.
2942 assert(ParamType
->getPointeeType()->isIncompleteOrObjectType() &&
2943 "Only object pointers allowed here");
2945 return CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param
,
2950 if (const ReferenceType
*ParamRefType
= ParamType
->getAs
<ReferenceType
>()) {
2951 // -- For a non-type template-parameter of type reference to
2952 // object, no conversions apply. The type referred to by the
2953 // reference may be more cv-qualified than the (otherwise
2954 // identical) type of the template-argument. The
2955 // template-parameter is bound directly to the
2956 // template-argument, which must be an lvalue.
2957 assert(ParamRefType
->getPointeeType()->isIncompleteOrObjectType() &&
2958 "Only object references allowed here");
2960 if (Arg
->getType() == Context
.OverloadTy
) {
2961 if (FunctionDecl
*Fn
= ResolveAddressOfOverloadedFunction(Arg
,
2962 ParamRefType
->getPointeeType(),
2965 if (DiagnoseUseOfDecl(Fn
, Arg
->getSourceRange().getBegin()))
2968 Arg
= FixOverloadedFunctionReference(Arg
, FoundResult
, Fn
);
2969 ArgType
= Arg
->getType();
2974 return CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param
,
2979 // -- For a non-type template-parameter of type pointer to data
2980 // member, qualification conversions (4.4) are applied.
2981 assert(ParamType
->isMemberPointerType() && "Only pointers to members remain");
2983 if (Context
.hasSameUnqualifiedType(ParamType
, ArgType
)) {
2984 // Types match exactly: nothing more to do here.
2985 } else if (IsQualificationConversion(ArgType
, ParamType
)) {
2986 ImpCastExprToType(Arg
, ParamType
, CK_NoOp
, CastCategory(Arg
));
2988 // We can't perform this conversion.
2989 Diag(Arg
->getSourceRange().getBegin(),
2990 diag::err_template_arg_not_convertible
)
2991 << Arg
->getType() << InstantiatedParamType
<< Arg
->getSourceRange();
2992 Diag(Param
->getLocation(), diag::note_template_param_here
);
2996 return CheckTemplateArgumentPointerToMember(Arg
, Converted
);
2999 /// \brief Check a template argument against its corresponding
3000 /// template template parameter.
3002 /// This routine implements the semantics of C++ [temp.arg.template].
3003 /// It returns true if an error occurred, and false otherwise.
3004 bool Sema::CheckTemplateArgument(TemplateTemplateParmDecl
*Param
,
3005 const TemplateArgumentLoc
&Arg
) {
3006 TemplateName Name
= Arg
.getArgument().getAsTemplate();
3007 TemplateDecl
*Template
= Name
.getAsTemplateDecl();
3009 // Any dependent template name is fine.
3010 assert(Name
.isDependent() && "Non-dependent template isn't a declaration?");
3014 // C++ [temp.arg.template]p1:
3015 // A template-argument for a template template-parameter shall be
3016 // the name of a class template, expressed as id-expression. Only
3017 // primary class templates are considered when matching the
3018 // template template argument with the corresponding parameter;
3019 // partial specializations are not considered even if their
3020 // parameter lists match that of the template template parameter.
3022 // Note that we also allow template template parameters here, which
3023 // will happen when we are dealing with, e.g., class template
3024 // partial specializations.
3025 if (!isa
<ClassTemplateDecl
>(Template
) &&
3026 !isa
<TemplateTemplateParmDecl
>(Template
)) {
3027 assert(isa
<FunctionTemplateDecl
>(Template
) &&
3028 "Only function templates are possible here");
3029 Diag(Arg
.getLocation(), diag::err_template_arg_not_class_template
);
3030 Diag(Template
->getLocation(), diag::note_template_arg_refers_here_func
)
3034 return !TemplateParameterListsAreEqual(Template
->getTemplateParameters(),
3035 Param
->getTemplateParameters(),
3037 TPL_TemplateTemplateArgumentMatch
,
3041 /// \brief Given a non-type template argument that refers to a
3042 /// declaration and the type of its corresponding non-type template
3043 /// parameter, produce an expression that properly refers to that
3046 Sema::BuildExpressionFromDeclTemplateArgument(const TemplateArgument
&Arg
,
3048 SourceLocation Loc
) {
3049 assert(Arg
.getKind() == TemplateArgument::Declaration
&&
3050 "Only declaration template arguments permitted here");
3051 ValueDecl
*VD
= cast
<ValueDecl
>(Arg
.getAsDecl());
3053 if (VD
->getDeclContext()->isRecord() &&
3054 (isa
<CXXMethodDecl
>(VD
) || isa
<FieldDecl
>(VD
))) {
3055 // If the value is a class member, we might have a pointer-to-member.
3056 // Determine whether the non-type template template parameter is of
3057 // pointer-to-member type. If so, we need to build an appropriate
3058 // expression for a pointer-to-member, since a "normal" DeclRefExpr
3059 // would refer to the member itself.
3060 if (ParamType
->isMemberPointerType()) {
3062 = Context
.getTypeDeclType(cast
<RecordDecl
>(VD
->getDeclContext()));
3063 NestedNameSpecifier
*Qualifier
3064 = NestedNameSpecifier::Create(Context
, 0, false,
3065 ClassType
.getTypePtr());
3067 SS
.setScopeRep(Qualifier
);
3068 ExprResult RefExpr
= BuildDeclRefExpr(VD
,
3069 VD
->getType().getNonReferenceType(),
3072 if (RefExpr
.isInvalid())
3075 RefExpr
= CreateBuiltinUnaryOp(Loc
, UO_AddrOf
, RefExpr
.get());
3077 // We might need to perform a trailing qualification conversion, since
3078 // the element type on the parameter could be more qualified than the
3079 // element type in the expression we constructed.
3080 if (IsQualificationConversion(((Expr
*) RefExpr
.get())->getType(),
3081 ParamType
.getUnqualifiedType())) {
3082 Expr
*RefE
= RefExpr
.takeAs
<Expr
>();
3083 ImpCastExprToType(RefE
, ParamType
.getUnqualifiedType(), CK_NoOp
);
3084 RefExpr
= Owned(RefE
);
3087 assert(!RefExpr
.isInvalid() &&
3088 Context
.hasSameType(((Expr
*) RefExpr
.get())->getType(),
3089 ParamType
.getUnqualifiedType()));
3090 return move(RefExpr
);
3094 QualType T
= VD
->getType().getNonReferenceType();
3095 if (ParamType
->isPointerType()) {
3096 // When the non-type template parameter is a pointer, take the
3097 // address of the declaration.
3098 ExprResult RefExpr
= BuildDeclRefExpr(VD
, T
, Loc
);
3099 if (RefExpr
.isInvalid())
3102 if (T
->isFunctionType() || T
->isArrayType()) {
3103 // Decay functions and arrays.
3104 Expr
*RefE
= (Expr
*)RefExpr
.get();
3105 DefaultFunctionArrayConversion(RefE
);
3106 if (RefE
!= RefExpr
.get()) {
3108 RefExpr
= Owned(RefE
);
3111 return move(RefExpr
);
3114 // Take the address of everything else
3115 return CreateBuiltinUnaryOp(Loc
, UO_AddrOf
, RefExpr
.get());
3118 // If the non-type template parameter has reference type, qualify the
3119 // resulting declaration reference with the extra qualifiers on the
3120 // type that the reference refers to.
3121 if (const ReferenceType
*TargetRef
= ParamType
->getAs
<ReferenceType
>())
3122 T
= Context
.getQualifiedType(T
, TargetRef
->getPointeeType().getQualifiers());
3124 return BuildDeclRefExpr(VD
, T
, Loc
);
3127 /// \brief Construct a new expression that refers to the given
3128 /// integral template argument with the given source-location
3131 /// This routine takes care of the mapping from an integral template
3132 /// argument (which may have any integral type) to the appropriate
3135 Sema::BuildExpressionFromIntegralTemplateArgument(const TemplateArgument
&Arg
,
3136 SourceLocation Loc
) {
3137 assert(Arg
.getKind() == TemplateArgument::Integral
&&
3138 "Operation is only value for integral template arguments");
3139 QualType T
= Arg
.getIntegralType();
3140 if (T
->isCharType() || T
->isWideCharType())
3141 return Owned(new (Context
) CharacterLiteral(
3142 Arg
.getAsIntegral()->getZExtValue(),
3143 T
->isWideCharType(),
3146 if (T
->isBooleanType())
3147 return Owned(new (Context
) CXXBoolLiteralExpr(
3148 Arg
.getAsIntegral()->getBoolValue(),
3152 return Owned(IntegerLiteral::Create(Context
, *Arg
.getAsIntegral(), T
, Loc
));
3156 /// \brief Determine whether the given template parameter lists are
3159 /// \param New The new template parameter list, typically written in the
3160 /// source code as part of a new template declaration.
3162 /// \param Old The old template parameter list, typically found via
3163 /// name lookup of the template declared with this template parameter
3166 /// \param Complain If true, this routine will produce a diagnostic if
3167 /// the template parameter lists are not equivalent.
3169 /// \param Kind describes how we are to match the template parameter lists.
3171 /// \param TemplateArgLoc If this source location is valid, then we
3172 /// are actually checking the template parameter list of a template
3173 /// argument (New) against the template parameter list of its
3174 /// corresponding template template parameter (Old). We produce
3175 /// slightly different diagnostics in this scenario.
3177 /// \returns True if the template parameter lists are equal, false
3180 Sema::TemplateParameterListsAreEqual(TemplateParameterList
*New
,
3181 TemplateParameterList
*Old
,
3183 TemplateParameterListEqualKind Kind
,
3184 SourceLocation TemplateArgLoc
) {
3185 if (Old
->size() != New
->size()) {
3187 unsigned NextDiag
= diag::err_template_param_list_different_arity
;
3188 if (TemplateArgLoc
.isValid()) {
3189 Diag(TemplateArgLoc
, diag::err_template_arg_template_params_mismatch
);
3190 NextDiag
= diag::note_template_param_list_different_arity
;
3192 Diag(New
->getTemplateLoc(), NextDiag
)
3193 << (New
->size() > Old
->size())
3194 << (Kind
!= TPL_TemplateMatch
)
3195 << SourceRange(New
->getTemplateLoc(), New
->getRAngleLoc());
3196 Diag(Old
->getTemplateLoc(), diag::note_template_prev_declaration
)
3197 << (Kind
!= TPL_TemplateMatch
)
3198 << SourceRange(Old
->getTemplateLoc(), Old
->getRAngleLoc());
3204 for (TemplateParameterList::iterator OldParm
= Old
->begin(),
3205 OldParmEnd
= Old
->end(), NewParm
= New
->begin();
3206 OldParm
!= OldParmEnd
; ++OldParm
, ++NewParm
) {
3207 if ((*OldParm
)->getKind() != (*NewParm
)->getKind()) {
3209 unsigned NextDiag
= diag::err_template_param_different_kind
;
3210 if (TemplateArgLoc
.isValid()) {
3211 Diag(TemplateArgLoc
, diag::err_template_arg_template_params_mismatch
);
3212 NextDiag
= diag::note_template_param_different_kind
;
3214 Diag((*NewParm
)->getLocation(), NextDiag
)
3215 << (Kind
!= TPL_TemplateMatch
);
3216 Diag((*OldParm
)->getLocation(), diag::note_template_prev_declaration
)
3217 << (Kind
!= TPL_TemplateMatch
);
3222 if (TemplateTypeParmDecl
*OldTTP
3223 = dyn_cast
<TemplateTypeParmDecl
>(*OldParm
)) {
3224 // Template type parameters are equivalent if either both are template
3225 // type parameter packs or neither are (since we know we're at the same
3227 TemplateTypeParmDecl
*NewTTP
= cast
<TemplateTypeParmDecl
>(*NewParm
);
3228 if (OldTTP
->isParameterPack() != NewTTP
->isParameterPack()) {
3229 // FIXME: Implement the rules in C++0x [temp.arg.template]p5 that
3230 // allow one to match a template parameter pack in the template
3231 // parameter list of a template template parameter to one or more
3232 // template parameters in the template parameter list of the
3233 // corresponding template template argument.
3235 unsigned NextDiag
= diag::err_template_parameter_pack_non_pack
;
3236 if (TemplateArgLoc
.isValid()) {
3237 Diag(TemplateArgLoc
,
3238 diag::err_template_arg_template_params_mismatch
);
3239 NextDiag
= diag::note_template_parameter_pack_non_pack
;
3241 Diag(NewTTP
->getLocation(), NextDiag
)
3242 << 0 << NewTTP
->isParameterPack();
3243 Diag(OldTTP
->getLocation(), diag::note_template_parameter_pack_here
)
3244 << 0 << OldTTP
->isParameterPack();
3248 } else if (NonTypeTemplateParmDecl
*OldNTTP
3249 = dyn_cast
<NonTypeTemplateParmDecl
>(*OldParm
)) {
3250 // The types of non-type template parameters must agree.
3251 NonTypeTemplateParmDecl
*NewNTTP
3252 = cast
<NonTypeTemplateParmDecl
>(*NewParm
);
3254 // If we are matching a template template argument to a template
3255 // template parameter and one of the non-type template parameter types
3256 // is dependent, then we must wait until template instantiation time
3257 // to actually compare the arguments.
3258 if (Kind
== TPL_TemplateTemplateArgumentMatch
&&
3259 (OldNTTP
->getType()->isDependentType() ||
3260 NewNTTP
->getType()->isDependentType()))
3263 if (Context
.getCanonicalType(OldNTTP
->getType()) !=
3264 Context
.getCanonicalType(NewNTTP
->getType())) {
3266 unsigned NextDiag
= diag::err_template_nontype_parm_different_type
;
3267 if (TemplateArgLoc
.isValid()) {
3268 Diag(TemplateArgLoc
,
3269 diag::err_template_arg_template_params_mismatch
);
3270 NextDiag
= diag::note_template_nontype_parm_different_type
;
3272 Diag(NewNTTP
->getLocation(), NextDiag
)
3273 << NewNTTP
->getType()
3274 << (Kind
!= TPL_TemplateMatch
);
3275 Diag(OldNTTP
->getLocation(),
3276 diag::note_template_nontype_parm_prev_declaration
)
3277 << OldNTTP
->getType();
3282 // The template parameter lists of template template
3283 // parameters must agree.
3284 assert(isa
<TemplateTemplateParmDecl
>(*OldParm
) &&
3285 "Only template template parameters handled here");
3286 TemplateTemplateParmDecl
*OldTTP
3287 = cast
<TemplateTemplateParmDecl
>(*OldParm
);
3288 TemplateTemplateParmDecl
*NewTTP
3289 = cast
<TemplateTemplateParmDecl
>(*NewParm
);
3290 if (!TemplateParameterListsAreEqual(NewTTP
->getTemplateParameters(),
3291 OldTTP
->getTemplateParameters(),
3293 (Kind
== TPL_TemplateMatch
? TPL_TemplateTemplateParmMatch
: Kind
),
3302 /// \brief Check whether a template can be declared within this scope.
3304 /// If the template declaration is valid in this scope, returns
3305 /// false. Otherwise, issues a diagnostic and returns true.
3307 Sema::CheckTemplateDeclScope(Scope
*S
, TemplateParameterList
*TemplateParams
) {
3308 // Find the nearest enclosing declaration scope.
3309 while ((S
->getFlags() & Scope::DeclScope
) == 0 ||
3310 (S
->getFlags() & Scope::TemplateParamScope
) != 0)
3314 // A template-declaration can appear only as a namespace scope or
3315 // class scope declaration.
3316 DeclContext
*Ctx
= static_cast<DeclContext
*>(S
->getEntity());
3317 if (Ctx
&& isa
<LinkageSpecDecl
>(Ctx
) &&
3318 cast
<LinkageSpecDecl
>(Ctx
)->getLanguage() != LinkageSpecDecl::lang_cxx
)
3319 return Diag(TemplateParams
->getTemplateLoc(), diag::err_template_linkage
)
3320 << TemplateParams
->getSourceRange();
3322 while (Ctx
&& isa
<LinkageSpecDecl
>(Ctx
))
3323 Ctx
= Ctx
->getParent();
3325 if (Ctx
&& (Ctx
->isFileContext() || Ctx
->isRecord()))
3328 return Diag(TemplateParams
->getTemplateLoc(),
3329 diag::err_template_outside_namespace_or_class_scope
)
3330 << TemplateParams
->getSourceRange();
3333 /// \brief Determine what kind of template specialization the given declaration
3335 static TemplateSpecializationKind
getTemplateSpecializationKind(NamedDecl
*D
) {
3337 return TSK_Undeclared
;
3339 if (CXXRecordDecl
*Record
= dyn_cast
<CXXRecordDecl
>(D
))
3340 return Record
->getTemplateSpecializationKind();
3341 if (FunctionDecl
*Function
= dyn_cast
<FunctionDecl
>(D
))
3342 return Function
->getTemplateSpecializationKind();
3343 if (VarDecl
*Var
= dyn_cast
<VarDecl
>(D
))
3344 return Var
->getTemplateSpecializationKind();
3346 return TSK_Undeclared
;
3349 /// \brief Check whether a specialization is well-formed in the current
3352 /// This routine determines whether a template specialization can be declared
3353 /// in the current context (C++ [temp.expl.spec]p2).
3355 /// \param S the semantic analysis object for which this check is being
3358 /// \param Specialized the entity being specialized or instantiated, which
3359 /// may be a kind of template (class template, function template, etc.) or
3360 /// a member of a class template (member function, static data member,
3363 /// \param PrevDecl the previous declaration of this entity, if any.
3365 /// \param Loc the location of the explicit specialization or instantiation of
3368 /// \param IsPartialSpecialization whether this is a partial specialization of
3369 /// a class template.
3371 /// \returns true if there was an error that we cannot recover from, false
3373 static bool CheckTemplateSpecializationScope(Sema
&S
,
3374 NamedDecl
*Specialized
,
3375 NamedDecl
*PrevDecl
,
3377 bool IsPartialSpecialization
) {
3378 // Keep these "kind" numbers in sync with the %select statements in the
3379 // various diagnostics emitted by this routine.
3381 bool isTemplateSpecialization
= false;
3382 if (isa
<ClassTemplateDecl
>(Specialized
)) {
3383 EntityKind
= IsPartialSpecialization
? 1 : 0;
3384 isTemplateSpecialization
= true;
3385 } else if (isa
<FunctionTemplateDecl
>(Specialized
)) {
3387 isTemplateSpecialization
= true;
3388 } else if (isa
<CXXMethodDecl
>(Specialized
))
3390 else if (isa
<VarDecl
>(Specialized
))
3392 else if (isa
<RecordDecl
>(Specialized
))
3395 S
.Diag(Loc
, diag::err_template_spec_unknown_kind
);
3396 S
.Diag(Specialized
->getLocation(), diag::note_specialized_entity
);
3400 // C++ [temp.expl.spec]p2:
3401 // An explicit specialization shall be declared in the namespace
3402 // of which the template is a member, or, for member templates, in
3403 // the namespace of which the enclosing class or enclosing class
3404 // template is a member. An explicit specialization of a member
3405 // function, member class or static data member of a class
3406 // template shall be declared in the namespace of which the class
3407 // template is a member. Such a declaration may also be a
3408 // definition. If the declaration is not a definition, the
3409 // specialization may be defined later in the name- space in which
3410 // the explicit specialization was declared, or in a namespace
3411 // that encloses the one in which the explicit specialization was
3413 if (S
.CurContext
->getLookupContext()->isFunctionOrMethod()) {
3414 S
.Diag(Loc
, diag::err_template_spec_decl_function_scope
)
3419 if (S
.CurContext
->isRecord() && !IsPartialSpecialization
) {
3420 S
.Diag(Loc
, diag::err_template_spec_decl_class_scope
)
3425 // C++ [temp.class.spec]p6:
3426 // A class template partial specialization may be declared or redeclared
3427 // in any namespace scope in which its definition may be defined (14.5.1
3429 bool ComplainedAboutScope
= false;
3430 DeclContext
*SpecializedContext
3431 = Specialized
->getDeclContext()->getEnclosingNamespaceContext();
3432 DeclContext
*DC
= S
.CurContext
->getEnclosingNamespaceContext();
3434 getTemplateSpecializationKind(PrevDecl
) == TSK_Undeclared
||
3435 getTemplateSpecializationKind(PrevDecl
) == TSK_ImplicitInstantiation
)){
3436 // There is no prior declaration of this entity, so this
3437 // specialization must be in the same context as the template
3439 if (!DC
->Equals(SpecializedContext
)) {
3440 if (isa
<TranslationUnitDecl
>(SpecializedContext
))
3441 S
.Diag(Loc
, diag::err_template_spec_decl_out_of_scope_global
)
3442 << EntityKind
<< Specialized
;
3443 else if (isa
<NamespaceDecl
>(SpecializedContext
))
3444 S
.Diag(Loc
, diag::err_template_spec_decl_out_of_scope
)
3445 << EntityKind
<< Specialized
3446 << cast
<NamedDecl
>(SpecializedContext
);
3448 S
.Diag(Specialized
->getLocation(), diag::note_specialized_entity
);
3449 ComplainedAboutScope
= true;
3453 // Make sure that this redeclaration (or definition) occurs in an enclosing
3455 // Note that HandleDeclarator() performs this check for explicit
3456 // specializations of function templates, static data members, and member
3457 // functions, so we skip the check here for those kinds of entities.
3458 // FIXME: HandleDeclarator's diagnostics aren't quite as good, though.
3459 // Should we refactor that check, so that it occurs later?
3460 if (!ComplainedAboutScope
&& !DC
->Encloses(SpecializedContext
) &&
3461 !(isa
<FunctionTemplateDecl
>(Specialized
) || isa
<VarDecl
>(Specialized
) ||
3462 isa
<FunctionDecl
>(Specialized
))) {
3463 if (isa
<TranslationUnitDecl
>(SpecializedContext
))
3464 S
.Diag(Loc
, diag::err_template_spec_redecl_global_scope
)
3465 << EntityKind
<< Specialized
;
3466 else if (isa
<NamespaceDecl
>(SpecializedContext
))
3467 S
.Diag(Loc
, diag::err_template_spec_redecl_out_of_scope
)
3468 << EntityKind
<< Specialized
3469 << cast
<NamedDecl
>(SpecializedContext
);
3471 S
.Diag(Specialized
->getLocation(), diag::note_specialized_entity
);
3474 // FIXME: check for specialization-after-instantiation errors and such.
3479 /// \brief Check the non-type template arguments of a class template
3480 /// partial specialization according to C++ [temp.class.spec]p9.
3482 /// \param TemplateParams the template parameters of the primary class
3485 /// \param TemplateArg the template arguments of the class template
3486 /// partial specialization.
3488 /// \param MirrorsPrimaryTemplate will be set true if the class
3489 /// template partial specialization arguments are identical to the
3490 /// implicit template arguments of the primary template. This is not
3491 /// necessarily an error (C++0x), and it is left to the caller to diagnose
3492 /// this condition when it is an error.
3494 /// \returns true if there was an error, false otherwise.
3495 bool Sema::CheckClassTemplatePartialSpecializationArgs(
3496 TemplateParameterList
*TemplateParams
,
3497 const TemplateArgumentListBuilder
&TemplateArgs
,
3498 bool &MirrorsPrimaryTemplate
) {
3499 // FIXME: the interface to this function will have to change to
3500 // accommodate variadic templates.
3501 MirrorsPrimaryTemplate
= true;
3503 const TemplateArgument
*ArgList
= TemplateArgs
.getFlatArguments();
3505 for (unsigned I
= 0, N
= TemplateParams
->size(); I
!= N
; ++I
) {
3506 // Determine whether the template argument list of the partial
3507 // specialization is identical to the implicit argument list of
3508 // the primary template. The caller may need to diagnostic this as
3509 // an error per C++ [temp.class.spec]p9b3.
3510 if (MirrorsPrimaryTemplate
) {
3511 if (TemplateTypeParmDecl
*TTP
3512 = dyn_cast
<TemplateTypeParmDecl
>(TemplateParams
->getParam(I
))) {
3513 if (Context
.getCanonicalType(Context
.getTypeDeclType(TTP
)) !=
3514 Context
.getCanonicalType(ArgList
[I
].getAsType()))
3515 MirrorsPrimaryTemplate
= false;
3516 } else if (TemplateTemplateParmDecl
*TTP
3517 = dyn_cast
<TemplateTemplateParmDecl
>(
3518 TemplateParams
->getParam(I
))) {
3519 TemplateName Name
= ArgList
[I
].getAsTemplate();
3520 TemplateTemplateParmDecl
*ArgDecl
3521 = dyn_cast_or_null
<TemplateTemplateParmDecl
>(Name
.getAsTemplateDecl());
3523 ArgDecl
->getIndex() != TTP
->getIndex() ||
3524 ArgDecl
->getDepth() != TTP
->getDepth())
3525 MirrorsPrimaryTemplate
= false;
3529 NonTypeTemplateParmDecl
*Param
3530 = dyn_cast
<NonTypeTemplateParmDecl
>(TemplateParams
->getParam(I
));
3535 Expr
*ArgExpr
= ArgList
[I
].getAsExpr();
3537 MirrorsPrimaryTemplate
= false;
3541 // C++ [temp.class.spec]p8:
3542 // A non-type argument is non-specialized if it is the name of a
3543 // non-type parameter. All other non-type arguments are
3546 // Below, we check the two conditions that only apply to
3547 // specialized non-type arguments, so skip any non-specialized
3549 if (DeclRefExpr
*DRE
= dyn_cast
<DeclRefExpr
>(ArgExpr
))
3550 if (NonTypeTemplateParmDecl
*NTTP
3551 = dyn_cast
<NonTypeTemplateParmDecl
>(DRE
->getDecl())) {
3552 if (MirrorsPrimaryTemplate
&&
3553 (Param
->getIndex() != NTTP
->getIndex() ||
3554 Param
->getDepth() != NTTP
->getDepth()))
3555 MirrorsPrimaryTemplate
= false;
3560 // C++ [temp.class.spec]p9:
3561 // Within the argument list of a class template partial
3562 // specialization, the following restrictions apply:
3563 // -- A partially specialized non-type argument expression
3564 // shall not involve a template parameter of the partial
3565 // specialization except when the argument expression is a
3566 // simple identifier.
3567 if (ArgExpr
->isTypeDependent() || ArgExpr
->isValueDependent()) {
3568 Diag(ArgExpr
->getLocStart(),
3569 diag::err_dependent_non_type_arg_in_partial_spec
)
3570 << ArgExpr
->getSourceRange();
3574 // -- The type of a template parameter corresponding to a
3575 // specialized non-type argument shall not be dependent on a
3576 // parameter of the specialization.
3577 if (Param
->getType()->isDependentType()) {
3578 Diag(ArgExpr
->getLocStart(),
3579 diag::err_dependent_typed_non_type_arg_in_partial_spec
)
3581 << ArgExpr
->getSourceRange();
3582 Diag(Param
->getLocation(), diag::note_template_param_here
);
3586 MirrorsPrimaryTemplate
= false;
3592 /// \brief Retrieve the previous declaration of the given declaration.
3593 static NamedDecl
*getPreviousDecl(NamedDecl
*ND
) {
3594 if (VarDecl
*VD
= dyn_cast
<VarDecl
>(ND
))
3595 return VD
->getPreviousDeclaration();
3596 if (FunctionDecl
*FD
= dyn_cast
<FunctionDecl
>(ND
))
3597 return FD
->getPreviousDeclaration();
3598 if (TagDecl
*TD
= dyn_cast
<TagDecl
>(ND
))
3599 return TD
->getPreviousDeclaration();
3600 if (TypedefDecl
*TD
= dyn_cast
<TypedefDecl
>(ND
))
3601 return TD
->getPreviousDeclaration();
3602 if (FunctionTemplateDecl
*FTD
= dyn_cast
<FunctionTemplateDecl
>(ND
))
3603 return FTD
->getPreviousDeclaration();
3604 if (ClassTemplateDecl
*CTD
= dyn_cast
<ClassTemplateDecl
>(ND
))
3605 return CTD
->getPreviousDeclaration();
3610 Sema::ActOnClassTemplateSpecialization(Scope
*S
, unsigned TagSpec
,
3612 SourceLocation KWLoc
,
3614 TemplateTy TemplateD
,
3615 SourceLocation TemplateNameLoc
,
3616 SourceLocation LAngleLoc
,
3617 ASTTemplateArgsPtr TemplateArgsIn
,
3618 SourceLocation RAngleLoc
,
3619 AttributeList
*Attr
,
3620 MultiTemplateParamsArg TemplateParameterLists
) {
3621 assert(TUK
!= TUK_Reference
&& "References are not specializations");
3623 // Find the class template we're specializing
3624 TemplateName Name
= TemplateD
.getAsVal
<TemplateName
>();
3625 ClassTemplateDecl
*ClassTemplate
3626 = dyn_cast_or_null
<ClassTemplateDecl
>(Name
.getAsTemplateDecl());
3628 if (!ClassTemplate
) {
3629 Diag(TemplateNameLoc
, diag::err_not_class_template_specialization
)
3630 << (Name
.getAsTemplateDecl() &&
3631 isa
<TemplateTemplateParmDecl
>(Name
.getAsTemplateDecl()));
3635 bool isExplicitSpecialization
= false;
3636 bool isPartialSpecialization
= false;
3638 // Check the validity of the template headers that introduce this
3640 // FIXME: We probably shouldn't complain about these headers for
3641 // friend declarations.
3642 bool Invalid
= false;
3643 TemplateParameterList
*TemplateParams
3644 = MatchTemplateParametersToScopeSpecifier(TemplateNameLoc
, SS
,
3645 (TemplateParameterList
**)TemplateParameterLists
.get(),
3646 TemplateParameterLists
.size(),
3648 isExplicitSpecialization
,
3653 unsigned NumMatchedTemplateParamLists
= TemplateParameterLists
.size();
3655 --NumMatchedTemplateParamLists
;
3657 if (TemplateParams
&& TemplateParams
->size() > 0) {
3658 isPartialSpecialization
= true;
3660 // C++ [temp.class.spec]p10:
3661 // The template parameter list of a specialization shall not
3662 // contain default template argument values.
3663 for (unsigned I
= 0, N
= TemplateParams
->size(); I
!= N
; ++I
) {
3664 Decl
*Param
= TemplateParams
->getParam(I
);
3665 if (TemplateTypeParmDecl
*TTP
= dyn_cast
<TemplateTypeParmDecl
>(Param
)) {
3666 if (TTP
->hasDefaultArgument()) {
3667 Diag(TTP
->getDefaultArgumentLoc(),
3668 diag::err_default_arg_in_partial_spec
);
3669 TTP
->removeDefaultArgument();
3671 } else if (NonTypeTemplateParmDecl
*NTTP
3672 = dyn_cast
<NonTypeTemplateParmDecl
>(Param
)) {
3673 if (Expr
*DefArg
= NTTP
->getDefaultArgument()) {
3674 Diag(NTTP
->getDefaultArgumentLoc(),
3675 diag::err_default_arg_in_partial_spec
)
3676 << DefArg
->getSourceRange();
3677 NTTP
->removeDefaultArgument();
3680 TemplateTemplateParmDecl
*TTP
= cast
<TemplateTemplateParmDecl
>(Param
);
3681 if (TTP
->hasDefaultArgument()) {
3682 Diag(TTP
->getDefaultArgument().getLocation(),
3683 diag::err_default_arg_in_partial_spec
)
3684 << TTP
->getDefaultArgument().getSourceRange();
3685 TTP
->removeDefaultArgument();
3689 } else if (TemplateParams
) {
3690 if (TUK
== TUK_Friend
)
3691 Diag(KWLoc
, diag::err_template_spec_friend
)
3692 << FixItHint::CreateRemoval(
3693 SourceRange(TemplateParams
->getTemplateLoc(),
3694 TemplateParams
->getRAngleLoc()))
3695 << SourceRange(LAngleLoc
, RAngleLoc
);
3697 isExplicitSpecialization
= true;
3698 } else if (TUK
!= TUK_Friend
) {
3699 Diag(KWLoc
, diag::err_template_spec_needs_header
)
3700 << FixItHint::CreateInsertion(KWLoc
, "template<> ");
3701 isExplicitSpecialization
= true;
3704 // Check that the specialization uses the same tag kind as the
3705 // original template.
3706 TagTypeKind Kind
= TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec
);
3707 assert(Kind
!= TTK_Enum
&& "Invalid enum tag in class template spec!");
3708 if (!isAcceptableTagRedeclaration(ClassTemplate
->getTemplatedDecl(),
3710 *ClassTemplate
->getIdentifier())) {
3711 Diag(KWLoc
, diag::err_use_with_wrong_tag
)
3713 << FixItHint::CreateReplacement(KWLoc
,
3714 ClassTemplate
->getTemplatedDecl()->getKindName());
3715 Diag(ClassTemplate
->getTemplatedDecl()->getLocation(),
3716 diag::note_previous_use
);
3717 Kind
= ClassTemplate
->getTemplatedDecl()->getTagKind();
3720 // Translate the parser's template argument list in our AST format.
3721 TemplateArgumentListInfo TemplateArgs
;
3722 TemplateArgs
.setLAngleLoc(LAngleLoc
);
3723 TemplateArgs
.setRAngleLoc(RAngleLoc
);
3724 translateTemplateArguments(TemplateArgsIn
, TemplateArgs
);
3726 // Check that the template argument list is well-formed for this
3728 TemplateArgumentListBuilder
Converted(ClassTemplate
->getTemplateParameters(),
3729 TemplateArgs
.size());
3730 if (CheckTemplateArgumentList(ClassTemplate
, TemplateNameLoc
,
3731 TemplateArgs
, false, Converted
))
3734 assert((Converted
.structuredSize() ==
3735 ClassTemplate
->getTemplateParameters()->size()) &&
3736 "Converted template argument list is too short!");
3738 // Find the class template (partial) specialization declaration that
3739 // corresponds to these arguments.
3740 if (isPartialSpecialization
) {
3741 bool MirrorsPrimaryTemplate
;
3742 if (CheckClassTemplatePartialSpecializationArgs(
3743 ClassTemplate
->getTemplateParameters(),
3744 Converted
, MirrorsPrimaryTemplate
))
3747 if (MirrorsPrimaryTemplate
) {
3748 // C++ [temp.class.spec]p9b3:
3750 // -- The argument list of the specialization shall not be identical
3751 // to the implicit argument list of the primary template.
3752 Diag(TemplateNameLoc
, diag::err_partial_spec_args_match_primary_template
)
3753 << (TUK
== TUK_Definition
)
3754 << FixItHint::CreateRemoval(SourceRange(LAngleLoc
, RAngleLoc
));
3755 return CheckClassTemplate(S
, TagSpec
, TUK
, KWLoc
, SS
,
3756 ClassTemplate
->getIdentifier(),
3763 // FIXME: Diagnose friend partial specializations
3765 if (!Name
.isDependent() &&
3766 !TemplateSpecializationType::anyDependentTemplateArguments(
3767 TemplateArgs
.getArgumentArray(),
3768 TemplateArgs
.size())) {
3769 Diag(TemplateNameLoc
, diag::err_partial_spec_fully_specialized
)
3770 << ClassTemplate
->getDeclName();
3771 isPartialSpecialization
= false;
3775 void *InsertPos
= 0;
3776 ClassTemplateSpecializationDecl
*PrevDecl
= 0;
3778 if (isPartialSpecialization
)
3779 // FIXME: Template parameter list matters, too
3781 = ClassTemplate
->findPartialSpecialization(Converted
.getFlatArguments(),
3782 Converted
.flatSize(),
3786 = ClassTemplate
->findSpecialization(Converted
.getFlatArguments(),
3787 Converted
.flatSize(), InsertPos
);
3789 ClassTemplateSpecializationDecl
*Specialization
= 0;
3791 // Check whether we can declare a class template specialization in
3792 // the current scope.
3793 if (TUK
!= TUK_Friend
&&
3794 CheckTemplateSpecializationScope(*this, ClassTemplate
, PrevDecl
,
3796 isPartialSpecialization
))
3799 // The canonical type
3802 (PrevDecl
->getSpecializationKind() == TSK_Undeclared
||
3803 TUK
== TUK_Friend
)) {
3804 // Since the only prior class template specialization with these
3805 // arguments was referenced but not declared, or we're only
3806 // referencing this specialization as a friend, reuse that
3807 // declaration node as our own, updating its source location to
3808 // reflect our new declaration.
3809 Specialization
= PrevDecl
;
3810 Specialization
->setLocation(TemplateNameLoc
);
3812 CanonType
= Context
.getTypeDeclType(Specialization
);
3813 } else if (isPartialSpecialization
) {
3814 // Build the canonical type that describes the converted template
3815 // arguments of the class template partial specialization.
3816 TemplateName CanonTemplate
= Context
.getCanonicalTemplateName(Name
);
3817 CanonType
= Context
.getTemplateSpecializationType(CanonTemplate
,
3818 Converted
.getFlatArguments(),
3819 Converted
.flatSize());
3821 // Create a new class template partial specialization declaration node.
3822 ClassTemplatePartialSpecializationDecl
*PrevPartial
3823 = cast_or_null
<ClassTemplatePartialSpecializationDecl
>(PrevDecl
);
3824 unsigned SequenceNumber
= PrevPartial
? PrevPartial
->getSequenceNumber()
3825 : ClassTemplate
->getNextPartialSpecSequenceNumber();
3826 ClassTemplatePartialSpecializationDecl
*Partial
3827 = ClassTemplatePartialSpecializationDecl::Create(Context
, Kind
,
3828 ClassTemplate
->getDeclContext(),
3837 SetNestedNameSpecifier(Partial
, SS
);
3838 if (NumMatchedTemplateParamLists
> 0 && SS
.isSet()) {
3839 Partial
->setTemplateParameterListsInfo(Context
,
3840 NumMatchedTemplateParamLists
,
3841 (TemplateParameterList
**) TemplateParameterLists
.release());
3845 ClassTemplate
->AddPartialSpecialization(Partial
, InsertPos
);
3846 Specialization
= Partial
;
3848 // If we are providing an explicit specialization of a member class
3849 // template specialization, make a note of that.
3850 if (PrevPartial
&& PrevPartial
->getInstantiatedFromMember())
3851 PrevPartial
->setMemberSpecialization();
3853 // Check that all of the template parameters of the class template
3854 // partial specialization are deducible from the template
3855 // arguments. If not, this class template partial specialization
3856 // will never be used.
3857 llvm::SmallVector
<bool, 8> DeducibleParams
;
3858 DeducibleParams
.resize(TemplateParams
->size());
3859 MarkUsedTemplateParameters(Partial
->getTemplateArgs(), true,
3860 TemplateParams
->getDepth(),
3862 unsigned NumNonDeducible
= 0;
3863 for (unsigned I
= 0, N
= DeducibleParams
.size(); I
!= N
; ++I
)
3864 if (!DeducibleParams
[I
])
3867 if (NumNonDeducible
) {
3868 Diag(TemplateNameLoc
, diag::warn_partial_specs_not_deducible
)
3869 << (NumNonDeducible
> 1)
3870 << SourceRange(TemplateNameLoc
, RAngleLoc
);
3871 for (unsigned I
= 0, N
= DeducibleParams
.size(); I
!= N
; ++I
) {
3872 if (!DeducibleParams
[I
]) {
3873 NamedDecl
*Param
= cast
<NamedDecl
>(TemplateParams
->getParam(I
));
3874 if (Param
->getDeclName())
3875 Diag(Param
->getLocation(),
3876 diag::note_partial_spec_unused_parameter
)
3877 << Param
->getDeclName();
3879 Diag(Param
->getLocation(),
3880 diag::note_partial_spec_unused_parameter
)
3886 // Create a new class template specialization declaration node for
3887 // this explicit specialization or friend declaration.
3889 = ClassTemplateSpecializationDecl::Create(Context
, Kind
,
3890 ClassTemplate
->getDeclContext(),
3895 SetNestedNameSpecifier(Specialization
, SS
);
3896 if (NumMatchedTemplateParamLists
> 0 && SS
.isSet()) {
3897 Specialization
->setTemplateParameterListsInfo(Context
,
3898 NumMatchedTemplateParamLists
,
3899 (TemplateParameterList
**) TemplateParameterLists
.release());
3903 ClassTemplate
->AddSpecialization(Specialization
, InsertPos
);
3905 CanonType
= Context
.getTypeDeclType(Specialization
);
3908 // C++ [temp.expl.spec]p6:
3909 // If a template, a member template or the member of a class template is
3910 // explicitly specialized then that specialization shall be declared
3911 // before the first use of that specialization that would cause an implicit
3912 // instantiation to take place, in every translation unit in which such a
3913 // use occurs; no diagnostic is required.
3914 if (PrevDecl
&& PrevDecl
->getPointOfInstantiation().isValid()) {
3916 for (NamedDecl
*Prev
= PrevDecl
; Prev
; Prev
= getPreviousDecl(Prev
)) {
3917 // Is there any previous explicit specialization declaration?
3918 if (getTemplateSpecializationKind(Prev
) == TSK_ExplicitSpecialization
) {
3925 SourceRange
Range(TemplateNameLoc
, RAngleLoc
);
3926 Diag(TemplateNameLoc
, diag::err_specialization_after_instantiation
)
3927 << Context
.getTypeDeclType(Specialization
) << Range
;
3929 Diag(PrevDecl
->getPointOfInstantiation(),
3930 diag::note_instantiation_required_here
)
3931 << (PrevDecl
->getTemplateSpecializationKind()
3932 != TSK_ImplicitInstantiation
);
3937 // If this is not a friend, note that this is an explicit specialization.
3938 if (TUK
!= TUK_Friend
)
3939 Specialization
->setSpecializationKind(TSK_ExplicitSpecialization
);
3941 // Check that this isn't a redefinition of this specialization.
3942 if (TUK
== TUK_Definition
) {
3943 if (RecordDecl
*Def
= Specialization
->getDefinition()) {
3944 SourceRange
Range(TemplateNameLoc
, RAngleLoc
);
3945 Diag(TemplateNameLoc
, diag::err_redefinition
)
3946 << Context
.getTypeDeclType(Specialization
) << Range
;
3947 Diag(Def
->getLocation(), diag::note_previous_definition
);
3948 Specialization
->setInvalidDecl();
3953 // Build the fully-sugared type for this class template
3954 // specialization as the user wrote in the specialization
3955 // itself. This means that we'll pretty-print the type retrieved
3956 // from the specialization's declaration the way that the user
3957 // actually wrote the specialization, rather than formatting the
3958 // name based on the "canonical" representation used to store the
3959 // template arguments in the specialization.
3960 TypeSourceInfo
*WrittenTy
3961 = Context
.getTemplateSpecializationTypeInfo(Name
, TemplateNameLoc
,
3962 TemplateArgs
, CanonType
);
3963 if (TUK
!= TUK_Friend
) {
3964 Specialization
->setTypeAsWritten(WrittenTy
);
3966 Specialization
->setTemplateKeywordLoc(TemplateParams
->getTemplateLoc());
3968 TemplateArgsIn
.release();
3970 // C++ [temp.expl.spec]p9:
3971 // A template explicit specialization is in the scope of the
3972 // namespace in which the template was defined.
3974 // We actually implement this paragraph where we set the semantic
3975 // context (in the creation of the ClassTemplateSpecializationDecl),
3976 // but we also maintain the lexical context where the actual
3977 // definition occurs.
3978 Specialization
->setLexicalDeclContext(CurContext
);
3980 // We may be starting the definition of this specialization.
3981 if (TUK
== TUK_Definition
)
3982 Specialization
->startDefinition();
3984 if (TUK
== TUK_Friend
) {
3985 FriendDecl
*Friend
= FriendDecl::Create(Context
, CurContext
,
3989 Friend
->setAccess(AS_public
);
3990 CurContext
->addDecl(Friend
);
3992 // Add the specialization into its lexical context, so that it can
3993 // be seen when iterating through the list of declarations in that
3994 // context. However, specializations are not found by name lookup.
3995 CurContext
->addDecl(Specialization
);
3997 return Specialization
;
4000 Decl
*Sema::ActOnTemplateDeclarator(Scope
*S
,
4001 MultiTemplateParamsArg TemplateParameterLists
,
4003 return HandleDeclarator(S
, D
, move(TemplateParameterLists
), false);
4006 Decl
*Sema::ActOnStartOfFunctionTemplateDef(Scope
*FnBodyScope
,
4007 MultiTemplateParamsArg TemplateParameterLists
,
4009 assert(getCurFunctionDecl() == 0 && "Function parsing confused");
4010 assert(D
.getTypeObject(0).Kind
== DeclaratorChunk::Function
&&
4011 "Not a function declarator!");
4012 DeclaratorChunk::FunctionTypeInfo
&FTI
= D
.getTypeObject(0).Fun
;
4014 if (FTI
.hasPrototype
) {
4015 // FIXME: Diagnose arguments without names in C.
4018 Scope
*ParentScope
= FnBodyScope
->getParent();
4020 Decl
*DP
= HandleDeclarator(ParentScope
, D
,
4021 move(TemplateParameterLists
),
4022 /*IsFunctionDefinition=*/true);
4023 if (FunctionTemplateDecl
*FunctionTemplate
4024 = dyn_cast_or_null
<FunctionTemplateDecl
>(DP
))
4025 return ActOnStartOfFunctionDef(FnBodyScope
,
4026 FunctionTemplate
->getTemplatedDecl());
4027 if (FunctionDecl
*Function
= dyn_cast_or_null
<FunctionDecl
>(DP
))
4028 return ActOnStartOfFunctionDef(FnBodyScope
, Function
);
4032 /// \brief Strips various properties off an implicit instantiation
4033 /// that has just been explicitly specialized.
4034 static void StripImplicitInstantiation(NamedDecl
*D
) {
4037 if (FunctionDecl
*FD
= dyn_cast
<FunctionDecl
>(D
)) {
4038 FD
->setInlineSpecified(false);
4042 /// \brief Diagnose cases where we have an explicit template specialization
4043 /// before/after an explicit template instantiation, producing diagnostics
4044 /// for those cases where they are required and determining whether the
4045 /// new specialization/instantiation will have any effect.
4047 /// \param NewLoc the location of the new explicit specialization or
4050 /// \param NewTSK the kind of the new explicit specialization or instantiation.
4052 /// \param PrevDecl the previous declaration of the entity.
4054 /// \param PrevTSK the kind of the old explicit specialization or instantiatin.
4056 /// \param PrevPointOfInstantiation if valid, indicates where the previus
4057 /// declaration was instantiated (either implicitly or explicitly).
4059 /// \param HasNoEffect will be set to true to indicate that the new
4060 /// specialization or instantiation has no effect and should be ignored.
4062 /// \returns true if there was an error that should prevent the introduction of
4063 /// the new declaration into the AST, false otherwise.
4065 Sema::CheckSpecializationInstantiationRedecl(SourceLocation NewLoc
,
4066 TemplateSpecializationKind NewTSK
,
4067 NamedDecl
*PrevDecl
,
4068 TemplateSpecializationKind PrevTSK
,
4069 SourceLocation PrevPointOfInstantiation
,
4070 bool &HasNoEffect
) {
4071 HasNoEffect
= false;
4074 case TSK_Undeclared
:
4075 case TSK_ImplicitInstantiation
:
4076 assert(false && "Don't check implicit instantiations here");
4079 case TSK_ExplicitSpecialization
:
4081 case TSK_Undeclared
:
4082 case TSK_ExplicitSpecialization
:
4083 // Okay, we're just specializing something that is either already
4084 // explicitly specialized or has merely been mentioned without any
4088 case TSK_ImplicitInstantiation
:
4089 if (PrevPointOfInstantiation
.isInvalid()) {
4090 // The declaration itself has not actually been instantiated, so it is
4091 // still okay to specialize it.
4092 StripImplicitInstantiation(PrevDecl
);
4097 case TSK_ExplicitInstantiationDeclaration
:
4098 case TSK_ExplicitInstantiationDefinition
:
4099 assert((PrevTSK
== TSK_ImplicitInstantiation
||
4100 PrevPointOfInstantiation
.isValid()) &&
4101 "Explicit instantiation without point of instantiation?");
4103 // C++ [temp.expl.spec]p6:
4104 // If a template, a member template or the member of a class template
4105 // is explicitly specialized then that specialization shall be declared
4106 // before the first use of that specialization that would cause an
4107 // implicit instantiation to take place, in every translation unit in
4108 // which such a use occurs; no diagnostic is required.
4109 for (NamedDecl
*Prev
= PrevDecl
; Prev
; Prev
= getPreviousDecl(Prev
)) {
4110 // Is there any previous explicit specialization declaration?
4111 if (getTemplateSpecializationKind(Prev
) == TSK_ExplicitSpecialization
)
4115 Diag(NewLoc
, diag::err_specialization_after_instantiation
)
4117 Diag(PrevPointOfInstantiation
, diag::note_instantiation_required_here
)
4118 << (PrevTSK
!= TSK_ImplicitInstantiation
);
4124 case TSK_ExplicitInstantiationDeclaration
:
4126 case TSK_ExplicitInstantiationDeclaration
:
4127 // This explicit instantiation declaration is redundant (that's okay).
4131 case TSK_Undeclared
:
4132 case TSK_ImplicitInstantiation
:
4133 // We're explicitly instantiating something that may have already been
4134 // implicitly instantiated; that's fine.
4137 case TSK_ExplicitSpecialization
:
4138 // C++0x [temp.explicit]p4:
4139 // For a given set of template parameters, if an explicit instantiation
4140 // of a template appears after a declaration of an explicit
4141 // specialization for that template, the explicit instantiation has no
4146 case TSK_ExplicitInstantiationDefinition
:
4147 // C++0x [temp.explicit]p10:
4148 // If an entity is the subject of both an explicit instantiation
4149 // declaration and an explicit instantiation definition in the same
4150 // translation unit, the definition shall follow the declaration.
4152 diag::err_explicit_instantiation_declaration_after_definition
);
4153 Diag(PrevPointOfInstantiation
,
4154 diag::note_explicit_instantiation_definition_here
);
4155 assert(PrevPointOfInstantiation
.isValid() &&
4156 "Explicit instantiation without point of instantiation?");
4162 case TSK_ExplicitInstantiationDefinition
:
4164 case TSK_Undeclared
:
4165 case TSK_ImplicitInstantiation
:
4166 // We're explicitly instantiating something that may have already been
4167 // implicitly instantiated; that's fine.
4170 case TSK_ExplicitSpecialization
:
4171 // C++ DR 259, C++0x [temp.explicit]p4:
4172 // For a given set of template parameters, if an explicit
4173 // instantiation of a template appears after a declaration of
4174 // an explicit specialization for that template, the explicit
4175 // instantiation has no effect.
4177 // In C++98/03 mode, we only give an extension warning here, because it
4178 // is not harmful to try to explicitly instantiate something that
4179 // has been explicitly specialized.
4180 if (!getLangOptions().CPlusPlus0x
) {
4181 Diag(NewLoc
, diag::ext_explicit_instantiation_after_specialization
)
4183 Diag(PrevDecl
->getLocation(),
4184 diag::note_previous_template_specialization
);
4189 case TSK_ExplicitInstantiationDeclaration
:
4190 // We're explicity instantiating a definition for something for which we
4191 // were previously asked to suppress instantiations. That's fine.
4194 case TSK_ExplicitInstantiationDefinition
:
4195 // C++0x [temp.spec]p5:
4196 // For a given template and a given set of template-arguments,
4197 // - an explicit instantiation definition shall appear at most once
4199 Diag(NewLoc
, diag::err_explicit_instantiation_duplicate
)
4201 Diag(PrevPointOfInstantiation
,
4202 diag::note_previous_explicit_instantiation
);
4209 assert(false && "Missing specialization/instantiation case?");
4214 /// \brief Perform semantic analysis for the given dependent function
4215 /// template specialization. The only possible way to get a dependent
4216 /// function template specialization is with a friend declaration,
4219 /// template <class T> void foo(T);
4220 /// template <class T> class A {
4221 /// friend void foo<>(T);
4224 /// There really isn't any useful analysis we can do here, so we
4225 /// just store the information.
4227 Sema::CheckDependentFunctionTemplateSpecialization(FunctionDecl
*FD
,
4228 const TemplateArgumentListInfo
&ExplicitTemplateArgs
,
4229 LookupResult
&Previous
) {
4230 // Remove anything from Previous that isn't a function template in
4231 // the correct context.
4232 DeclContext
*FDLookupContext
= FD
->getDeclContext()->getLookupContext();
4233 LookupResult::Filter F
= Previous
.makeFilter();
4234 while (F
.hasNext()) {
4235 NamedDecl
*D
= F
.next()->getUnderlyingDecl();
4236 if (!isa
<FunctionTemplateDecl
>(D
) ||
4237 !FDLookupContext
->Equals(D
->getDeclContext()->getLookupContext()))
4242 // Should this be diagnosed here?
4243 if (Previous
.empty()) return true;
4245 FD
->setDependentTemplateSpecialization(Context
, Previous
.asUnresolvedSet(),
4246 ExplicitTemplateArgs
);
4250 /// \brief Perform semantic analysis for the given function template
4253 /// This routine performs all of the semantic analysis required for an
4254 /// explicit function template specialization. On successful completion,
4255 /// the function declaration \p FD will become a function template
4258 /// \param FD the function declaration, which will be updated to become a
4259 /// function template specialization.
4261 /// \param ExplicitTemplateArgs the explicitly-provided template arguments,
4262 /// if any. Note that this may be valid info even when 0 arguments are
4263 /// explicitly provided as in, e.g., \c void sort<>(char*, char*);
4264 /// as it anyway contains info on the angle brackets locations.
4266 /// \param PrevDecl the set of declarations that may be specialized by
4267 /// this function specialization.
4269 Sema::CheckFunctionTemplateSpecialization(FunctionDecl
*FD
,
4270 const TemplateArgumentListInfo
*ExplicitTemplateArgs
,
4271 LookupResult
&Previous
) {
4272 // The set of function template specializations that could match this
4273 // explicit function template specialization.
4274 UnresolvedSet
<8> Candidates
;
4276 DeclContext
*FDLookupContext
= FD
->getDeclContext()->getLookupContext();
4277 for (LookupResult::iterator I
= Previous
.begin(), E
= Previous
.end();
4279 NamedDecl
*Ovl
= (*I
)->getUnderlyingDecl();
4280 if (FunctionTemplateDecl
*FunTmpl
= dyn_cast
<FunctionTemplateDecl
>(Ovl
)) {
4281 // Only consider templates found within the same semantic lookup scope as
4283 if (!FDLookupContext
->Equals(Ovl
->getDeclContext()->getLookupContext()))
4286 // C++ [temp.expl.spec]p11:
4287 // A trailing template-argument can be left unspecified in the
4288 // template-id naming an explicit function template specialization
4289 // provided it can be deduced from the function argument type.
4290 // Perform template argument deduction to determine whether we may be
4291 // specializing this template.
4292 // FIXME: It is somewhat wasteful to build
4293 TemplateDeductionInfo
Info(Context
, FD
->getLocation());
4294 FunctionDecl
*Specialization
= 0;
4295 if (TemplateDeductionResult TDK
4296 = DeduceTemplateArguments(FunTmpl
, ExplicitTemplateArgs
,
4300 // FIXME: Template argument deduction failed; record why it failed, so
4301 // that we can provide nifty diagnostics.
4306 // Record this candidate.
4307 Candidates
.addDecl(Specialization
, I
.getAccess());
4311 // Find the most specialized function template.
4312 UnresolvedSetIterator Result
4313 = getMostSpecialized(Candidates
.begin(), Candidates
.end(),
4314 TPOC_Other
, FD
->getLocation(),
4315 PDiag(diag::err_function_template_spec_no_match
)
4316 << FD
->getDeclName(),
4317 PDiag(diag::err_function_template_spec_ambiguous
)
4318 << FD
->getDeclName() << (ExplicitTemplateArgs
!= 0),
4319 PDiag(diag::note_function_template_spec_matched
));
4320 if (Result
== Candidates
.end())
4323 // Ignore access information; it doesn't figure into redeclaration checking.
4324 FunctionDecl
*Specialization
= cast
<FunctionDecl
>(*Result
);
4325 Specialization
->setLocation(FD
->getLocation());
4327 // FIXME: Check if the prior specialization has a point of instantiation.
4328 // If so, we have run afoul of .
4330 // If this is a friend declaration, then we're not really declaring
4331 // an explicit specialization.
4332 bool isFriend
= (FD
->getFriendObjectKind() != Decl::FOK_None
);
4334 // Check the scope of this explicit specialization.
4336 CheckTemplateSpecializationScope(*this,
4337 Specialization
->getPrimaryTemplate(),
4338 Specialization
, FD
->getLocation(),
4342 // C++ [temp.expl.spec]p6:
4343 // If a template, a member template or the member of a class template is
4344 // explicitly specialized then that specialization shall be declared
4345 // before the first use of that specialization that would cause an implicit
4346 // instantiation to take place, in every translation unit in which such a
4347 // use occurs; no diagnostic is required.
4348 FunctionTemplateSpecializationInfo
*SpecInfo
4349 = Specialization
->getTemplateSpecializationInfo();
4350 assert(SpecInfo
&& "Function template specialization info missing?");
4352 bool HasNoEffect
= false;
4354 CheckSpecializationInstantiationRedecl(FD
->getLocation(),
4355 TSK_ExplicitSpecialization
,
4357 SpecInfo
->getTemplateSpecializationKind(),
4358 SpecInfo
->getPointOfInstantiation(),
4362 // Mark the prior declaration as an explicit specialization, so that later
4363 // clients know that this is an explicit specialization.
4365 SpecInfo
->setTemplateSpecializationKind(TSK_ExplicitSpecialization
);
4366 MarkUnusedFileScopedDecl(Specialization
);
4369 // Turn the given function declaration into a function template
4370 // specialization, with the template arguments from the previous
4372 // Take copies of (semantic and syntactic) template argument lists.
4373 const TemplateArgumentList
* TemplArgs
= new (Context
)
4374 TemplateArgumentList(Specialization
->getTemplateSpecializationArgs());
4375 const TemplateArgumentListInfo
* TemplArgsAsWritten
= ExplicitTemplateArgs
4376 ? new (Context
) TemplateArgumentListInfo(*ExplicitTemplateArgs
) : 0;
4377 FD
->setFunctionTemplateSpecialization(Specialization
->getPrimaryTemplate(),
4378 TemplArgs
, /*InsertPos=*/0,
4379 SpecInfo
->getTemplateSpecializationKind(),
4380 TemplArgsAsWritten
);
4382 // The "previous declaration" for this function template specialization is
4383 // the prior function template specialization.
4385 Previous
.addDecl(Specialization
);
4389 /// \brief Perform semantic analysis for the given non-template member
4392 /// This routine performs all of the semantic analysis required for an
4393 /// explicit member function specialization. On successful completion,
4394 /// the function declaration \p FD will become a member function
4397 /// \param Member the member declaration, which will be updated to become a
4400 /// \param Previous the set of declarations, one of which may be specialized
4401 /// by this function specialization; the set will be modified to contain the
4402 /// redeclared member.
4404 Sema::CheckMemberSpecialization(NamedDecl
*Member
, LookupResult
&Previous
) {
4405 assert(!isa
<TemplateDecl
>(Member
) && "Only for non-template members");
4407 // Try to find the member we are instantiating.
4408 NamedDecl
*Instantiation
= 0;
4409 NamedDecl
*InstantiatedFrom
= 0;
4410 MemberSpecializationInfo
*MSInfo
= 0;
4412 if (Previous
.empty()) {
4413 // Nowhere to look anyway.
4414 } else if (FunctionDecl
*Function
= dyn_cast
<FunctionDecl
>(Member
)) {
4415 for (LookupResult::iterator I
= Previous
.begin(), E
= Previous
.end();
4417 NamedDecl
*D
= (*I
)->getUnderlyingDecl();
4418 if (CXXMethodDecl
*Method
= dyn_cast
<CXXMethodDecl
>(D
)) {
4419 if (Context
.hasSameType(Function
->getType(), Method
->getType())) {
4420 Instantiation
= Method
;
4421 InstantiatedFrom
= Method
->getInstantiatedFromMemberFunction();
4422 MSInfo
= Method
->getMemberSpecializationInfo();
4427 } else if (isa
<VarDecl
>(Member
)) {
4429 if (Previous
.isSingleResult() &&
4430 (PrevVar
= dyn_cast
<VarDecl
>(Previous
.getFoundDecl())))
4431 if (PrevVar
->isStaticDataMember()) {
4432 Instantiation
= PrevVar
;
4433 InstantiatedFrom
= PrevVar
->getInstantiatedFromStaticDataMember();
4434 MSInfo
= PrevVar
->getMemberSpecializationInfo();
4436 } else if (isa
<RecordDecl
>(Member
)) {
4437 CXXRecordDecl
*PrevRecord
;
4438 if (Previous
.isSingleResult() &&
4439 (PrevRecord
= dyn_cast
<CXXRecordDecl
>(Previous
.getFoundDecl()))) {
4440 Instantiation
= PrevRecord
;
4441 InstantiatedFrom
= PrevRecord
->getInstantiatedFromMemberClass();
4442 MSInfo
= PrevRecord
->getMemberSpecializationInfo();
4446 if (!Instantiation
) {
4447 // There is no previous declaration that matches. Since member
4448 // specializations are always out-of-line, the caller will complain about
4449 // this mismatch later.
4453 // If this is a friend, just bail out here before we start turning
4454 // things into explicit specializations.
4455 if (Member
->getFriendObjectKind() != Decl::FOK_None
) {
4456 // Preserve instantiation information.
4457 if (InstantiatedFrom
&& isa
<CXXMethodDecl
>(Member
)) {
4458 cast
<CXXMethodDecl
>(Member
)->setInstantiationOfMemberFunction(
4459 cast
<CXXMethodDecl
>(InstantiatedFrom
),
4460 cast
<CXXMethodDecl
>(Instantiation
)->getTemplateSpecializationKind());
4461 } else if (InstantiatedFrom
&& isa
<CXXRecordDecl
>(Member
)) {
4462 cast
<CXXRecordDecl
>(Member
)->setInstantiationOfMemberClass(
4463 cast
<CXXRecordDecl
>(InstantiatedFrom
),
4464 cast
<CXXRecordDecl
>(Instantiation
)->getTemplateSpecializationKind());
4468 Previous
.addDecl(Instantiation
);
4472 // Make sure that this is a specialization of a member.
4473 if (!InstantiatedFrom
) {
4474 Diag(Member
->getLocation(), diag::err_spec_member_not_instantiated
)
4476 Diag(Instantiation
->getLocation(), diag::note_specialized_decl
);
4480 // C++ [temp.expl.spec]p6:
4481 // If a template, a member template or the member of a class template is
4482 // explicitly specialized then that spe- cialization shall be declared
4483 // before the first use of that specialization that would cause an implicit
4484 // instantiation to take place, in every translation unit in which such a
4485 // use occurs; no diagnostic is required.
4486 assert(MSInfo
&& "Member specialization info missing?");
4488 bool HasNoEffect
= false;
4489 if (CheckSpecializationInstantiationRedecl(Member
->getLocation(),
4490 TSK_ExplicitSpecialization
,
4492 MSInfo
->getTemplateSpecializationKind(),
4493 MSInfo
->getPointOfInstantiation(),
4497 // Check the scope of this explicit specialization.
4498 if (CheckTemplateSpecializationScope(*this,
4500 Instantiation
, Member
->getLocation(),
4504 // Note that this is an explicit instantiation of a member.
4505 // the original declaration to note that it is an explicit specialization
4506 // (if it was previously an implicit instantiation). This latter step
4507 // makes bookkeeping easier.
4508 if (isa
<FunctionDecl
>(Member
)) {
4509 FunctionDecl
*InstantiationFunction
= cast
<FunctionDecl
>(Instantiation
);
4510 if (InstantiationFunction
->getTemplateSpecializationKind() ==
4511 TSK_ImplicitInstantiation
) {
4512 InstantiationFunction
->setTemplateSpecializationKind(
4513 TSK_ExplicitSpecialization
);
4514 InstantiationFunction
->setLocation(Member
->getLocation());
4517 cast
<FunctionDecl
>(Member
)->setInstantiationOfMemberFunction(
4518 cast
<CXXMethodDecl
>(InstantiatedFrom
),
4519 TSK_ExplicitSpecialization
);
4520 MarkUnusedFileScopedDecl(InstantiationFunction
);
4521 } else if (isa
<VarDecl
>(Member
)) {
4522 VarDecl
*InstantiationVar
= cast
<VarDecl
>(Instantiation
);
4523 if (InstantiationVar
->getTemplateSpecializationKind() ==
4524 TSK_ImplicitInstantiation
) {
4525 InstantiationVar
->setTemplateSpecializationKind(
4526 TSK_ExplicitSpecialization
);
4527 InstantiationVar
->setLocation(Member
->getLocation());
4530 Context
.setInstantiatedFromStaticDataMember(cast
<VarDecl
>(Member
),
4531 cast
<VarDecl
>(InstantiatedFrom
),
4532 TSK_ExplicitSpecialization
);
4533 MarkUnusedFileScopedDecl(InstantiationVar
);
4535 assert(isa
<CXXRecordDecl
>(Member
) && "Only member classes remain");
4536 CXXRecordDecl
*InstantiationClass
= cast
<CXXRecordDecl
>(Instantiation
);
4537 if (InstantiationClass
->getTemplateSpecializationKind() ==
4538 TSK_ImplicitInstantiation
) {
4539 InstantiationClass
->setTemplateSpecializationKind(
4540 TSK_ExplicitSpecialization
);
4541 InstantiationClass
->setLocation(Member
->getLocation());
4544 cast
<CXXRecordDecl
>(Member
)->setInstantiationOfMemberClass(
4545 cast
<CXXRecordDecl
>(InstantiatedFrom
),
4546 TSK_ExplicitSpecialization
);
4549 // Save the caller the trouble of having to figure out which declaration
4550 // this specialization matches.
4552 Previous
.addDecl(Instantiation
);
4556 /// \brief Check the scope of an explicit instantiation.
4558 /// \returns true if a serious error occurs, false otherwise.
4559 static bool CheckExplicitInstantiationScope(Sema
&S
, NamedDecl
*D
,
4560 SourceLocation InstLoc
,
4561 bool WasQualifiedName
) {
4562 DeclContext
*ExpectedContext
4563 = D
->getDeclContext()->getEnclosingNamespaceContext()->getLookupContext();
4564 DeclContext
*CurContext
= S
.CurContext
->getLookupContext();
4566 if (CurContext
->isRecord()) {
4567 S
.Diag(InstLoc
, diag::err_explicit_instantiation_in_class
)
4572 // C++0x [temp.explicit]p2:
4573 // An explicit instantiation shall appear in an enclosing namespace of its
4576 // This is DR275, which we do not retroactively apply to C++98/03.
4577 if (S
.getLangOptions().CPlusPlus0x
&&
4578 !CurContext
->Encloses(ExpectedContext
)) {
4579 if (NamespaceDecl
*NS
= dyn_cast
<NamespaceDecl
>(ExpectedContext
))
4581 S
.getLangOptions().CPlusPlus0x
?
4582 diag::err_explicit_instantiation_out_of_scope
4583 : diag::warn_explicit_instantiation_out_of_scope_0x
)
4587 S
.getLangOptions().CPlusPlus0x
?
4588 diag::err_explicit_instantiation_must_be_global
4589 : diag::warn_explicit_instantiation_out_of_scope_0x
)
4591 S
.Diag(D
->getLocation(), diag::note_explicit_instantiation_here
);
4595 // C++0x [temp.explicit]p2:
4596 // If the name declared in the explicit instantiation is an unqualified
4597 // name, the explicit instantiation shall appear in the namespace where
4598 // its template is declared or, if that namespace is inline (7.3.1), any
4599 // namespace from its enclosing namespace set.
4600 if (WasQualifiedName
)
4603 if (CurContext
->Equals(ExpectedContext
))
4607 S
.getLangOptions().CPlusPlus0x
?
4608 diag::err_explicit_instantiation_unqualified_wrong_namespace
4609 : diag::warn_explicit_instantiation_unqualified_wrong_namespace_0x
)
4610 << D
<< ExpectedContext
;
4611 S
.Diag(D
->getLocation(), diag::note_explicit_instantiation_here
);
4615 /// \brief Determine whether the given scope specifier has a template-id in it.
4616 static bool ScopeSpecifierHasTemplateId(const CXXScopeSpec
&SS
) {
4620 // C++0x [temp.explicit]p2:
4621 // If the explicit instantiation is for a member function, a member class
4622 // or a static data member of a class template specialization, the name of
4623 // the class template specialization in the qualified-id for the member
4624 // name shall be a simple-template-id.
4626 // C++98 has the same restriction, just worded differently.
4627 for (NestedNameSpecifier
*NNS
= (NestedNameSpecifier
*)SS
.getScopeRep();
4628 NNS
; NNS
= NNS
->getPrefix())
4629 if (Type
*T
= NNS
->getAsType())
4630 if (isa
<TemplateSpecializationType
>(T
))
4636 // Explicit instantiation of a class template specialization
4638 Sema::ActOnExplicitInstantiation(Scope
*S
,
4639 SourceLocation ExternLoc
,
4640 SourceLocation TemplateLoc
,
4642 SourceLocation KWLoc
,
4643 const CXXScopeSpec
&SS
,
4644 TemplateTy TemplateD
,
4645 SourceLocation TemplateNameLoc
,
4646 SourceLocation LAngleLoc
,
4647 ASTTemplateArgsPtr TemplateArgsIn
,
4648 SourceLocation RAngleLoc
,
4649 AttributeList
*Attr
) {
4650 // Find the class template we're specializing
4651 TemplateName Name
= TemplateD
.getAsVal
<TemplateName
>();
4652 ClassTemplateDecl
*ClassTemplate
4653 = cast
<ClassTemplateDecl
>(Name
.getAsTemplateDecl());
4655 // Check that the specialization uses the same tag kind as the
4656 // original template.
4657 TagTypeKind Kind
= TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec
);
4658 assert(Kind
!= TTK_Enum
&&
4659 "Invalid enum tag in class template explicit instantiation!");
4660 if (!isAcceptableTagRedeclaration(ClassTemplate
->getTemplatedDecl(),
4662 *ClassTemplate
->getIdentifier())) {
4663 Diag(KWLoc
, diag::err_use_with_wrong_tag
)
4665 << FixItHint::CreateReplacement(KWLoc
,
4666 ClassTemplate
->getTemplatedDecl()->getKindName());
4667 Diag(ClassTemplate
->getTemplatedDecl()->getLocation(),
4668 diag::note_previous_use
);
4669 Kind
= ClassTemplate
->getTemplatedDecl()->getTagKind();
4672 // C++0x [temp.explicit]p2:
4673 // There are two forms of explicit instantiation: an explicit instantiation
4674 // definition and an explicit instantiation declaration. An explicit
4675 // instantiation declaration begins with the extern keyword. [...]
4676 TemplateSpecializationKind TSK
4677 = ExternLoc
.isInvalid()? TSK_ExplicitInstantiationDefinition
4678 : TSK_ExplicitInstantiationDeclaration
;
4680 // Translate the parser's template argument list in our AST format.
4681 TemplateArgumentListInfo
TemplateArgs(LAngleLoc
, RAngleLoc
);
4682 translateTemplateArguments(TemplateArgsIn
, TemplateArgs
);
4684 // Check that the template argument list is well-formed for this
4686 TemplateArgumentListBuilder
Converted(ClassTemplate
->getTemplateParameters(),
4687 TemplateArgs
.size());
4688 if (CheckTemplateArgumentList(ClassTemplate
, TemplateNameLoc
,
4689 TemplateArgs
, false, Converted
))
4692 assert((Converted
.structuredSize() ==
4693 ClassTemplate
->getTemplateParameters()->size()) &&
4694 "Converted template argument list is too short!");
4696 // Find the class template specialization declaration that
4697 // corresponds to these arguments.
4698 void *InsertPos
= 0;
4699 ClassTemplateSpecializationDecl
*PrevDecl
4700 = ClassTemplate
->findSpecialization(Converted
.getFlatArguments(),
4701 Converted
.flatSize(), InsertPos
);
4703 TemplateSpecializationKind PrevDecl_TSK
4704 = PrevDecl
? PrevDecl
->getTemplateSpecializationKind() : TSK_Undeclared
;
4706 // C++0x [temp.explicit]p2:
4707 // [...] An explicit instantiation shall appear in an enclosing
4708 // namespace of its template. [...]
4710 // This is C++ DR 275.
4711 if (CheckExplicitInstantiationScope(*this, ClassTemplate
, TemplateNameLoc
,
4715 ClassTemplateSpecializationDecl
*Specialization
= 0;
4717 bool ReusedDecl
= false;
4718 bool HasNoEffect
= false;
4720 if (CheckSpecializationInstantiationRedecl(TemplateNameLoc
, TSK
,
4721 PrevDecl
, PrevDecl_TSK
,
4722 PrevDecl
->getPointOfInstantiation(),
4726 // Even though HasNoEffect == true means that this explicit instantiation
4727 // has no effect on semantics, we go on to put its syntax in the AST.
4729 if (PrevDecl_TSK
== TSK_ImplicitInstantiation
||
4730 PrevDecl_TSK
== TSK_Undeclared
) {
4731 // Since the only prior class template specialization with these
4732 // arguments was referenced but not declared, reuse that
4733 // declaration node as our own, updating the source location
4734 // for the template name to reflect our new declaration.
4735 // (Other source locations will be updated later.)
4736 Specialization
= PrevDecl
;
4737 Specialization
->setLocation(TemplateNameLoc
);
4743 if (!Specialization
) {
4744 // Create a new class template specialization declaration node for
4745 // this explicit specialization.
4747 = ClassTemplateSpecializationDecl::Create(Context
, Kind
,
4748 ClassTemplate
->getDeclContext(),
4751 Converted
, PrevDecl
);
4752 SetNestedNameSpecifier(Specialization
, SS
);
4754 if (!HasNoEffect
&& !PrevDecl
) {
4755 // Insert the new specialization.
4756 ClassTemplate
->AddSpecialization(Specialization
, InsertPos
);
4760 // Build the fully-sugared type for this explicit instantiation as
4761 // the user wrote in the explicit instantiation itself. This means
4762 // that we'll pretty-print the type retrieved from the
4763 // specialization's declaration the way that the user actually wrote
4764 // the explicit instantiation, rather than formatting the name based
4765 // on the "canonical" representation used to store the template
4766 // arguments in the specialization.
4767 TypeSourceInfo
*WrittenTy
4768 = Context
.getTemplateSpecializationTypeInfo(Name
, TemplateNameLoc
,
4770 Context
.getTypeDeclType(Specialization
));
4771 Specialization
->setTypeAsWritten(WrittenTy
);
4772 TemplateArgsIn
.release();
4774 // Set source locations for keywords.
4775 Specialization
->setExternLoc(ExternLoc
);
4776 Specialization
->setTemplateKeywordLoc(TemplateLoc
);
4778 // Add the explicit instantiation into its lexical context. However,
4779 // since explicit instantiations are never found by name lookup, we
4780 // just put it into the declaration context directly.
4781 Specialization
->setLexicalDeclContext(CurContext
);
4782 CurContext
->addDecl(Specialization
);
4784 // Syntax is now OK, so return if it has no other effect on semantics.
4786 // Set the template specialization kind.
4787 Specialization
->setTemplateSpecializationKind(TSK
);
4788 return Specialization
;
4791 // C++ [temp.explicit]p3:
4792 // A definition of a class template or class member template
4793 // shall be in scope at the point of the explicit instantiation of
4794 // the class template or class member template.
4796 // This check comes when we actually try to perform the
4798 ClassTemplateSpecializationDecl
*Def
4799 = cast_or_null
<ClassTemplateSpecializationDecl
>(
4800 Specialization
->getDefinition());
4802 InstantiateClassTemplateSpecialization(TemplateNameLoc
, Specialization
, TSK
);
4803 else if (TSK
== TSK_ExplicitInstantiationDefinition
) {
4804 MarkVTableUsed(TemplateNameLoc
, Specialization
, true);
4805 Specialization
->setPointOfInstantiation(Def
->getPointOfInstantiation());
4808 // Instantiate the members of this class template specialization.
4809 Def
= cast_or_null
<ClassTemplateSpecializationDecl
>(
4810 Specialization
->getDefinition());
4812 TemplateSpecializationKind Old_TSK
= Def
->getTemplateSpecializationKind();
4814 // Fix a TSK_ExplicitInstantiationDeclaration followed by a
4815 // TSK_ExplicitInstantiationDefinition
4816 if (Old_TSK
== TSK_ExplicitInstantiationDeclaration
&&
4817 TSK
== TSK_ExplicitInstantiationDefinition
)
4818 Def
->setTemplateSpecializationKind(TSK
);
4820 InstantiateClassTemplateSpecializationMembers(TemplateNameLoc
, Def
, TSK
);
4823 // Set the template specialization kind.
4824 Specialization
->setTemplateSpecializationKind(TSK
);
4825 return Specialization
;
4828 // Explicit instantiation of a member class of a class template.
4830 Sema::ActOnExplicitInstantiation(Scope
*S
,
4831 SourceLocation ExternLoc
,
4832 SourceLocation TemplateLoc
,
4834 SourceLocation KWLoc
,
4836 IdentifierInfo
*Name
,
4837 SourceLocation NameLoc
,
4838 AttributeList
*Attr
) {
4841 bool IsDependent
= false;
4842 Decl
*TagD
= ActOnTag(S
, TagSpec
, Sema::TUK_Reference
,
4843 KWLoc
, SS
, Name
, NameLoc
, Attr
, AS_none
,
4844 MultiTemplateParamsArg(*this, 0, 0),
4845 Owned
, IsDependent
);
4846 assert(!IsDependent
&& "explicit instantiation of dependent name not yet handled");
4851 TagDecl
*Tag
= cast
<TagDecl
>(TagD
);
4852 if (Tag
->isEnum()) {
4853 Diag(TemplateLoc
, diag::err_explicit_instantiation_enum
)
4854 << Context
.getTypeDeclType(Tag
);
4858 if (Tag
->isInvalidDecl())
4861 CXXRecordDecl
*Record
= cast
<CXXRecordDecl
>(Tag
);
4862 CXXRecordDecl
*Pattern
= Record
->getInstantiatedFromMemberClass();
4864 Diag(TemplateLoc
, diag::err_explicit_instantiation_nontemplate_type
)
4865 << Context
.getTypeDeclType(Record
);
4866 Diag(Record
->getLocation(), diag::note_nontemplate_decl_here
);
4870 // C++0x [temp.explicit]p2:
4871 // If the explicit instantiation is for a class or member class, the
4872 // elaborated-type-specifier in the declaration shall include a
4873 // simple-template-id.
4875 // C++98 has the same restriction, just worded differently.
4876 if (!ScopeSpecifierHasTemplateId(SS
))
4877 Diag(TemplateLoc
, diag::ext_explicit_instantiation_without_qualified_id
)
4878 << Record
<< SS
.getRange();
4880 // C++0x [temp.explicit]p2:
4881 // There are two forms of explicit instantiation: an explicit instantiation
4882 // definition and an explicit instantiation declaration. An explicit
4883 // instantiation declaration begins with the extern keyword. [...]
4884 TemplateSpecializationKind TSK
4885 = ExternLoc
.isInvalid()? TSK_ExplicitInstantiationDefinition
4886 : TSK_ExplicitInstantiationDeclaration
;
4888 // C++0x [temp.explicit]p2:
4889 // [...] An explicit instantiation shall appear in an enclosing
4890 // namespace of its template. [...]
4892 // This is C++ DR 275.
4893 CheckExplicitInstantiationScope(*this, Record
, NameLoc
, true);
4895 // Verify that it is okay to explicitly instantiate here.
4896 CXXRecordDecl
*PrevDecl
4897 = cast_or_null
<CXXRecordDecl
>(Record
->getPreviousDeclaration());
4898 if (!PrevDecl
&& Record
->getDefinition())
4901 MemberSpecializationInfo
*MSInfo
= PrevDecl
->getMemberSpecializationInfo();
4902 bool HasNoEffect
= false;
4903 assert(MSInfo
&& "No member specialization information?");
4904 if (CheckSpecializationInstantiationRedecl(TemplateLoc
, TSK
,
4906 MSInfo
->getTemplateSpecializationKind(),
4907 MSInfo
->getPointOfInstantiation(),
4914 CXXRecordDecl
*RecordDef
4915 = cast_or_null
<CXXRecordDecl
>(Record
->getDefinition());
4917 // C++ [temp.explicit]p3:
4918 // A definition of a member class of a class template shall be in scope
4919 // at the point of an explicit instantiation of the member class.
4921 = cast_or_null
<CXXRecordDecl
>(Pattern
->getDefinition());
4923 Diag(TemplateLoc
, diag::err_explicit_instantiation_undefined_member
)
4924 << 0 << Record
->getDeclName() << Record
->getDeclContext();
4925 Diag(Pattern
->getLocation(), diag::note_forward_declaration
)
4929 if (InstantiateClass(NameLoc
, Record
, Def
,
4930 getTemplateInstantiationArgs(Record
),
4934 RecordDef
= cast_or_null
<CXXRecordDecl
>(Record
->getDefinition());
4940 // Instantiate all of the members of the class.
4941 InstantiateClassMembers(NameLoc
, RecordDef
,
4942 getTemplateInstantiationArgs(Record
), TSK
);
4944 if (TSK
== TSK_ExplicitInstantiationDefinition
)
4945 MarkVTableUsed(NameLoc
, RecordDef
, true);
4947 // FIXME: We don't have any representation for explicit instantiations of
4948 // member classes. Such a representation is not needed for compilation, but it
4949 // should be available for clients that want to see all of the declarations in
4954 DeclResult
Sema::ActOnExplicitInstantiation(Scope
*S
,
4955 SourceLocation ExternLoc
,
4956 SourceLocation TemplateLoc
,
4958 // Explicit instantiations always require a name.
4959 // TODO: check if/when DNInfo should replace Name.
4960 DeclarationNameInfo NameInfo
= GetNameForDeclarator(D
);
4961 DeclarationName Name
= NameInfo
.getName();
4963 if (!D
.isInvalidType())
4964 Diag(D
.getDeclSpec().getSourceRange().getBegin(),
4965 diag::err_explicit_instantiation_requires_name
)
4966 << D
.getDeclSpec().getSourceRange()
4967 << D
.getSourceRange();
4972 // The scope passed in may not be a decl scope. Zip up the scope tree until
4973 // we find one that is.
4974 while ((S
->getFlags() & Scope::DeclScope
) == 0 ||
4975 (S
->getFlags() & Scope::TemplateParamScope
) != 0)
4978 // Determine the type of the declaration.
4979 TypeSourceInfo
*T
= GetTypeForDeclarator(D
, S
);
4980 QualType R
= T
->getType();
4984 if (D
.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef
) {
4985 // Cannot explicitly instantiate a typedef.
4986 Diag(D
.getIdentifierLoc(), diag::err_explicit_instantiation_of_typedef
)
4991 // C++0x [temp.explicit]p1:
4992 // [...] An explicit instantiation of a function template shall not use the
4993 // inline or constexpr specifiers.
4994 // Presumably, this also applies to member functions of class templates as
4996 if (D
.getDeclSpec().isInlineSpecified() && getLangOptions().CPlusPlus0x
)
4997 Diag(D
.getDeclSpec().getInlineSpecLoc(),
4998 diag::err_explicit_instantiation_inline
)
4999 <<FixItHint::CreateRemoval(D
.getDeclSpec().getInlineSpecLoc());
5001 // FIXME: check for constexpr specifier.
5003 // C++0x [temp.explicit]p2:
5004 // There are two forms of explicit instantiation: an explicit instantiation
5005 // definition and an explicit instantiation declaration. An explicit
5006 // instantiation declaration begins with the extern keyword. [...]
5007 TemplateSpecializationKind TSK
5008 = ExternLoc
.isInvalid()? TSK_ExplicitInstantiationDefinition
5009 : TSK_ExplicitInstantiationDeclaration
;
5011 LookupResult
Previous(*this, NameInfo
, LookupOrdinaryName
);
5012 LookupParsedName(Previous
, S
, &D
.getCXXScopeSpec());
5014 if (!R
->isFunctionType()) {
5015 // C++ [temp.explicit]p1:
5016 // A [...] static data member of a class template can be explicitly
5017 // instantiated from the member definition associated with its class
5019 if (Previous
.isAmbiguous())
5022 VarDecl
*Prev
= Previous
.getAsSingle
<VarDecl
>();
5023 if (!Prev
|| !Prev
->isStaticDataMember()) {
5024 // We expect to see a data data member here.
5025 Diag(D
.getIdentifierLoc(), diag::err_explicit_instantiation_not_known
)
5027 for (LookupResult::iterator P
= Previous
.begin(), PEnd
= Previous
.end();
5029 Diag((*P
)->getLocation(), diag::note_explicit_instantiation_here
);
5033 if (!Prev
->getInstantiatedFromStaticDataMember()) {
5034 // FIXME: Check for explicit specialization?
5035 Diag(D
.getIdentifierLoc(),
5036 diag::err_explicit_instantiation_data_member_not_instantiated
)
5038 Diag(Prev
->getLocation(), diag::note_explicit_instantiation_here
);
5039 // FIXME: Can we provide a note showing where this was declared?
5043 // C++0x [temp.explicit]p2:
5044 // If the explicit instantiation is for a member function, a member class
5045 // or a static data member of a class template specialization, the name of
5046 // the class template specialization in the qualified-id for the member
5047 // name shall be a simple-template-id.
5049 // C++98 has the same restriction, just worded differently.
5050 if (!ScopeSpecifierHasTemplateId(D
.getCXXScopeSpec()))
5051 Diag(D
.getIdentifierLoc(),
5052 diag::ext_explicit_instantiation_without_qualified_id
)
5053 << Prev
<< D
.getCXXScopeSpec().getRange();
5055 // Check the scope of this explicit instantiation.
5056 CheckExplicitInstantiationScope(*this, Prev
, D
.getIdentifierLoc(), true);
5058 // Verify that it is okay to explicitly instantiate here.
5059 MemberSpecializationInfo
*MSInfo
= Prev
->getMemberSpecializationInfo();
5060 assert(MSInfo
&& "Missing static data member specialization info?");
5061 bool HasNoEffect
= false;
5062 if (CheckSpecializationInstantiationRedecl(D
.getIdentifierLoc(), TSK
, Prev
,
5063 MSInfo
->getTemplateSpecializationKind(),
5064 MSInfo
->getPointOfInstantiation(),
5070 // Instantiate static data member.
5071 Prev
->setTemplateSpecializationKind(TSK
, D
.getIdentifierLoc());
5072 if (TSK
== TSK_ExplicitInstantiationDefinition
)
5073 InstantiateStaticDataMemberDefinition(D
.getIdentifierLoc(), Prev
);
5075 // FIXME: Create an ExplicitInstantiation node?
5079 // If the declarator is a template-id, translate the parser's template
5080 // argument list into our AST format.
5081 bool HasExplicitTemplateArgs
= false;
5082 TemplateArgumentListInfo TemplateArgs
;
5083 if (D
.getName().getKind() == UnqualifiedId::IK_TemplateId
) {
5084 TemplateIdAnnotation
*TemplateId
= D
.getName().TemplateId
;
5085 TemplateArgs
.setLAngleLoc(TemplateId
->LAngleLoc
);
5086 TemplateArgs
.setRAngleLoc(TemplateId
->RAngleLoc
);
5087 ASTTemplateArgsPtr
TemplateArgsPtr(*this,
5088 TemplateId
->getTemplateArgs(),
5089 TemplateId
->NumArgs
);
5090 translateTemplateArguments(TemplateArgsPtr
, TemplateArgs
);
5091 HasExplicitTemplateArgs
= true;
5092 TemplateArgsPtr
.release();
5095 // C++ [temp.explicit]p1:
5096 // A [...] function [...] can be explicitly instantiated from its template.
5097 // A member function [...] of a class template can be explicitly
5098 // instantiated from the member definition associated with its class
5100 UnresolvedSet
<8> Matches
;
5101 for (LookupResult::iterator P
= Previous
.begin(), PEnd
= Previous
.end();
5103 NamedDecl
*Prev
= *P
;
5104 if (!HasExplicitTemplateArgs
) {
5105 if (CXXMethodDecl
*Method
= dyn_cast
<CXXMethodDecl
>(Prev
)) {
5106 if (Context
.hasSameUnqualifiedType(Method
->getType(), R
)) {
5109 Matches
.addDecl(Method
, P
.getAccess());
5110 if (Method
->getTemplateSpecializationKind() == TSK_Undeclared
)
5116 FunctionTemplateDecl
*FunTmpl
= dyn_cast
<FunctionTemplateDecl
>(Prev
);
5120 TemplateDeductionInfo
Info(Context
, D
.getIdentifierLoc());
5121 FunctionDecl
*Specialization
= 0;
5122 if (TemplateDeductionResult TDK
5123 = DeduceTemplateArguments(FunTmpl
,
5124 (HasExplicitTemplateArgs
? &TemplateArgs
: 0),
5125 R
, Specialization
, Info
)) {
5126 // FIXME: Keep track of almost-matches?
5131 Matches
.addDecl(Specialization
, P
.getAccess());
5134 // Find the most specialized function template specialization.
5135 UnresolvedSetIterator Result
5136 = getMostSpecialized(Matches
.begin(), Matches
.end(), TPOC_Other
,
5137 D
.getIdentifierLoc(),
5138 PDiag(diag::err_explicit_instantiation_not_known
) << Name
,
5139 PDiag(diag::err_explicit_instantiation_ambiguous
) << Name
,
5140 PDiag(diag::note_explicit_instantiation_candidate
));
5142 if (Result
== Matches
.end())
5145 // Ignore access control bits, we don't need them for redeclaration checking.
5146 FunctionDecl
*Specialization
= cast
<FunctionDecl
>(*Result
);
5148 if (Specialization
->getTemplateSpecializationKind() == TSK_Undeclared
) {
5149 Diag(D
.getIdentifierLoc(),
5150 diag::err_explicit_instantiation_member_function_not_instantiated
)
5152 << (Specialization
->getTemplateSpecializationKind() ==
5153 TSK_ExplicitSpecialization
);
5154 Diag(Specialization
->getLocation(), diag::note_explicit_instantiation_here
);
5158 FunctionDecl
*PrevDecl
= Specialization
->getPreviousDeclaration();
5159 if (!PrevDecl
&& Specialization
->isThisDeclarationADefinition())
5160 PrevDecl
= Specialization
;
5163 bool HasNoEffect
= false;
5164 if (CheckSpecializationInstantiationRedecl(D
.getIdentifierLoc(), TSK
,
5166 PrevDecl
->getTemplateSpecializationKind(),
5167 PrevDecl
->getPointOfInstantiation(),
5171 // FIXME: We may still want to build some representation of this
5172 // explicit specialization.
5177 Specialization
->setTemplateSpecializationKind(TSK
, D
.getIdentifierLoc());
5179 if (TSK
== TSK_ExplicitInstantiationDefinition
)
5180 InstantiateFunctionDefinition(D
.getIdentifierLoc(), Specialization
);
5182 // C++0x [temp.explicit]p2:
5183 // If the explicit instantiation is for a member function, a member class
5184 // or a static data member of a class template specialization, the name of
5185 // the class template specialization in the qualified-id for the member
5186 // name shall be a simple-template-id.
5188 // C++98 has the same restriction, just worded differently.
5189 FunctionTemplateDecl
*FunTmpl
= Specialization
->getPrimaryTemplate();
5190 if (D
.getName().getKind() != UnqualifiedId::IK_TemplateId
&& !FunTmpl
&&
5191 D
.getCXXScopeSpec().isSet() &&
5192 !ScopeSpecifierHasTemplateId(D
.getCXXScopeSpec()))
5193 Diag(D
.getIdentifierLoc(),
5194 diag::ext_explicit_instantiation_without_qualified_id
)
5195 << Specialization
<< D
.getCXXScopeSpec().getRange();
5197 CheckExplicitInstantiationScope(*this,
5198 FunTmpl
? (NamedDecl
*)FunTmpl
5199 : Specialization
->getInstantiatedFromMemberFunction(),
5200 D
.getIdentifierLoc(),
5201 D
.getCXXScopeSpec().isSet());
5203 // FIXME: Create some kind of ExplicitInstantiationDecl here.
5208 Sema::ActOnDependentTag(Scope
*S
, unsigned TagSpec
, TagUseKind TUK
,
5209 const CXXScopeSpec
&SS
, IdentifierInfo
*Name
,
5210 SourceLocation TagLoc
, SourceLocation NameLoc
) {
5211 // This has to hold, because SS is expected to be defined.
5212 assert(Name
&& "Expected a name in a dependent tag");
5214 NestedNameSpecifier
*NNS
5215 = static_cast<NestedNameSpecifier
*>(SS
.getScopeRep());
5219 TagTypeKind Kind
= TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec
);
5221 if (TUK
== TUK_Declaration
|| TUK
== TUK_Definition
) {
5222 Diag(NameLoc
, diag::err_dependent_tag_decl
)
5223 << (TUK
== TUK_Definition
) << Kind
<< SS
.getRange();
5227 ElaboratedTypeKeyword Kwd
= TypeWithKeyword::getKeywordForTagTypeKind(Kind
);
5228 return ParsedType::make(Context
.getDependentNameType(Kwd
, NNS
, Name
));
5232 Sema::ActOnTypenameType(Scope
*S
, SourceLocation TypenameLoc
,
5233 const CXXScopeSpec
&SS
, const IdentifierInfo
&II
,
5234 SourceLocation IdLoc
) {
5235 NestedNameSpecifier
*NNS
5236 = static_cast<NestedNameSpecifier
*>(SS
.getScopeRep());
5240 if (TypenameLoc
.isValid() && S
&& !S
->getTemplateParamParent() &&
5241 !getLangOptions().CPlusPlus0x
)
5242 Diag(TypenameLoc
, diag::ext_typename_outside_of_template
)
5243 << FixItHint::CreateRemoval(TypenameLoc
);
5245 QualType T
= CheckTypenameType(ETK_Typename
, NNS
, II
,
5246 TypenameLoc
, SS
.getRange(), IdLoc
);
5250 TypeSourceInfo
*TSI
= Context
.CreateTypeSourceInfo(T
);
5251 if (isa
<DependentNameType
>(T
)) {
5252 DependentNameTypeLoc TL
= cast
<DependentNameTypeLoc
>(TSI
->getTypeLoc());
5253 TL
.setKeywordLoc(TypenameLoc
);
5254 TL
.setQualifierRange(SS
.getRange());
5255 TL
.setNameLoc(IdLoc
);
5257 ElaboratedTypeLoc TL
= cast
<ElaboratedTypeLoc
>(TSI
->getTypeLoc());
5258 TL
.setKeywordLoc(TypenameLoc
);
5259 TL
.setQualifierRange(SS
.getRange());
5260 cast
<TypeSpecTypeLoc
>(TL
.getNamedTypeLoc()).setNameLoc(IdLoc
);
5263 return CreateParsedType(T
, TSI
);
5267 Sema::ActOnTypenameType(Scope
*S
, SourceLocation TypenameLoc
,
5268 const CXXScopeSpec
&SS
, SourceLocation TemplateLoc
,
5270 if (TypenameLoc
.isValid() && S
&& !S
->getTemplateParamParent() &&
5271 !getLangOptions().CPlusPlus0x
)
5272 Diag(TypenameLoc
, diag::ext_typename_outside_of_template
)
5273 << FixItHint::CreateRemoval(TypenameLoc
);
5275 TypeSourceInfo
*InnerTSI
= 0;
5276 QualType T
= GetTypeFromParser(Ty
, &InnerTSI
);
5278 assert(isa
<TemplateSpecializationType
>(T
) &&
5279 "Expected a template specialization type");
5281 if (computeDeclContext(SS
, false)) {
5282 // If we can compute a declaration context, then the "typename"
5283 // keyword was superfluous. Just build an ElaboratedType to keep
5284 // track of the nested-name-specifier.
5286 // Push the inner type, preserving its source locations if possible.
5287 TypeLocBuilder Builder
;
5289 Builder
.pushFullCopy(InnerTSI
->getTypeLoc());
5291 Builder
.push
<TemplateSpecializationTypeLoc
>(T
).initialize(TemplateLoc
);
5293 /* Note: NNS already embedded in template specialization type T. */
5294 T
= Context
.getElaboratedType(ETK_Typename
, /*NNS=*/0, T
);
5295 ElaboratedTypeLoc TL
= Builder
.push
<ElaboratedTypeLoc
>(T
);
5296 TL
.setKeywordLoc(TypenameLoc
);
5297 TL
.setQualifierRange(SS
.getRange());
5299 TypeSourceInfo
*TSI
= Builder
.getTypeSourceInfo(Context
, T
);
5300 return CreateParsedType(T
, TSI
);
5303 // TODO: it's really silly that we make a template specialization
5304 // type earlier only to drop it again here.
5305 TemplateSpecializationType
*TST
= cast
<TemplateSpecializationType
>(T
);
5306 DependentTemplateName
*DTN
=
5307 TST
->getTemplateName().getAsDependentTemplateName();
5308 assert(DTN
&& "dependent template has non-dependent name?");
5309 assert(DTN
->getQualifier()
5310 == static_cast<NestedNameSpecifier
*>(SS
.getScopeRep()));
5311 T
= Context
.getDependentTemplateSpecializationType(ETK_Typename
,
5312 DTN
->getQualifier(),
5313 DTN
->getIdentifier(),
5316 TypeSourceInfo
*TSI
= Context
.CreateTypeSourceInfo(T
);
5317 DependentTemplateSpecializationTypeLoc TL
=
5318 cast
<DependentTemplateSpecializationTypeLoc
>(TSI
->getTypeLoc());
5320 TemplateSpecializationTypeLoc TSTL
=
5321 cast
<TemplateSpecializationTypeLoc
>(InnerTSI
->getTypeLoc());
5322 TL
.setLAngleLoc(TSTL
.getLAngleLoc());
5323 TL
.setRAngleLoc(TSTL
.getRAngleLoc());
5324 for (unsigned I
= 0, E
= TST
->getNumArgs(); I
!= E
; ++I
)
5325 TL
.setArgLocInfo(I
, TSTL
.getArgLocInfo(I
));
5327 TL
.initializeLocal(SourceLocation());
5329 TL
.setKeywordLoc(TypenameLoc
);
5330 TL
.setQualifierRange(SS
.getRange());
5331 return CreateParsedType(T
, TSI
);
5334 /// \brief Build the type that describes a C++ typename specifier,
5335 /// e.g., "typename T::type".
5337 Sema::CheckTypenameType(ElaboratedTypeKeyword Keyword
,
5338 NestedNameSpecifier
*NNS
, const IdentifierInfo
&II
,
5339 SourceLocation KeywordLoc
, SourceRange NNSRange
,
5340 SourceLocation IILoc
) {
5342 SS
.setScopeRep(NNS
);
5343 SS
.setRange(NNSRange
);
5345 DeclContext
*Ctx
= computeDeclContext(SS
);
5347 // If the nested-name-specifier is dependent and couldn't be
5348 // resolved to a type, build a typename type.
5349 assert(NNS
->isDependent());
5350 return Context
.getDependentNameType(Keyword
, NNS
, &II
);
5353 // If the nested-name-specifier refers to the current instantiation,
5354 // the "typename" keyword itself is superfluous. In C++03, the
5355 // program is actually ill-formed. However, DR 382 (in C++0x CD1)
5356 // allows such extraneous "typename" keywords, and we retroactively
5357 // apply this DR to C++03 code with only a warning. In any case we continue.
5359 if (RequireCompleteDeclContext(SS
, Ctx
))
5362 DeclarationName
Name(&II
);
5363 LookupResult
Result(*this, Name
, IILoc
, LookupOrdinaryName
);
5364 LookupQualifiedName(Result
, Ctx
);
5365 unsigned DiagID
= 0;
5366 Decl
*Referenced
= 0;
5367 switch (Result
.getResultKind()) {
5368 case LookupResult::NotFound
:
5369 DiagID
= diag::err_typename_nested_not_found
;
5372 case LookupResult::NotFoundInCurrentInstantiation
:
5373 // Okay, it's a member of an unknown instantiation.
5374 return Context
.getDependentNameType(Keyword
, NNS
, &II
);
5376 case LookupResult::Found
:
5377 if (TypeDecl
*Type
= dyn_cast
<TypeDecl
>(Result
.getFoundDecl())) {
5378 // We found a type. Build an ElaboratedType, since the
5379 // typename-specifier was just sugar.
5380 return Context
.getElaboratedType(ETK_Typename
, NNS
,
5381 Context
.getTypeDeclType(Type
));
5384 DiagID
= diag::err_typename_nested_not_type
;
5385 Referenced
= Result
.getFoundDecl();
5388 case LookupResult::FoundUnresolvedValue
:
5389 llvm_unreachable("unresolved using decl in non-dependent context");
5392 case LookupResult::FoundOverloaded
:
5393 DiagID
= diag::err_typename_nested_not_type
;
5394 Referenced
= *Result
.begin();
5397 case LookupResult::Ambiguous
:
5401 // If we get here, it's because name lookup did not find a
5402 // type. Emit an appropriate diagnostic and return an error.
5403 SourceRange
FullRange(KeywordLoc
.isValid() ? KeywordLoc
: NNSRange
.getBegin(),
5405 Diag(IILoc
, DiagID
) << FullRange
<< Name
<< Ctx
;
5407 Diag(Referenced
->getLocation(), diag::note_typename_refers_here
)
5413 // See Sema::RebuildTypeInCurrentInstantiation
5414 class CurrentInstantiationRebuilder
5415 : public TreeTransform
<CurrentInstantiationRebuilder
> {
5417 DeclarationName Entity
;
5420 typedef TreeTransform
<CurrentInstantiationRebuilder
> inherited
;
5422 CurrentInstantiationRebuilder(Sema
&SemaRef
,
5424 DeclarationName Entity
)
5425 : TreeTransform
<CurrentInstantiationRebuilder
>(SemaRef
),
5426 Loc(Loc
), Entity(Entity
) { }
5428 /// \brief Determine whether the given type \p T has already been
5431 /// For the purposes of type reconstruction, a type has already been
5432 /// transformed if it is NULL or if it is not dependent.
5433 bool AlreadyTransformed(QualType T
) {
5434 return T
.isNull() || !T
->isDependentType();
5437 /// \brief Returns the location of the entity whose type is being
5439 SourceLocation
getBaseLocation() { return Loc
; }
5441 /// \brief Returns the name of the entity whose type is being rebuilt.
5442 DeclarationName
getBaseEntity() { return Entity
; }
5444 /// \brief Sets the "base" location and entity when that
5445 /// information is known based on another transformation.
5446 void setBase(SourceLocation Loc
, DeclarationName Entity
) {
5448 this->Entity
= Entity
;
5453 /// \brief Rebuilds a type within the context of the current instantiation.
5455 /// The type \p T is part of the type of an out-of-line member definition of
5456 /// a class template (or class template partial specialization) that was parsed
5457 /// and constructed before we entered the scope of the class template (or
5458 /// partial specialization thereof). This routine will rebuild that type now
5459 /// that we have entered the declarator's scope, which may produce different
5460 /// canonical types, e.g.,
5463 /// template<typename T>
5465 /// typedef T* pointer;
5469 /// template<typename T>
5470 /// typename X<T>::pointer X<T>::data() { ... }
5473 /// Here, the type "typename X<T>::pointer" will be created as a DependentNameType,
5474 /// since we do not know that we can look into X<T> when we parsed the type.
5475 /// This function will rebuild the type, performing the lookup of "pointer"
5476 /// in X<T> and returning an ElaboratedType whose canonical type is the same
5477 /// as the canonical type of T*, allowing the return types of the out-of-line
5478 /// definition and the declaration to match.
5479 TypeSourceInfo
*Sema::RebuildTypeInCurrentInstantiation(TypeSourceInfo
*T
,
5481 DeclarationName Name
) {
5482 if (!T
|| !T
->getType()->isDependentType())
5485 CurrentInstantiationRebuilder
Rebuilder(*this, Loc
, Name
);
5486 return Rebuilder
.TransformType(T
);
5489 ExprResult
Sema::RebuildExprInCurrentInstantiation(Expr
*E
) {
5490 CurrentInstantiationRebuilder
Rebuilder(*this, E
->getExprLoc(),
5492 return Rebuilder
.TransformExpr(E
);
5495 bool Sema::RebuildNestedNameSpecifierInCurrentInstantiation(CXXScopeSpec
&SS
) {
5496 if (SS
.isInvalid()) return true;
5498 NestedNameSpecifier
*NNS
= static_cast<NestedNameSpecifier
*>(SS
.getScopeRep());
5499 CurrentInstantiationRebuilder
Rebuilder(*this, SS
.getRange().getBegin(),
5501 NestedNameSpecifier
*Rebuilt
=
5502 Rebuilder
.TransformNestedNameSpecifier(NNS
, SS
.getRange());
5503 if (!Rebuilt
) return true;
5505 SS
.setScopeRep(Rebuilt
);
5509 /// \brief Produces a formatted string that describes the binding of
5510 /// template parameters to template arguments.
5512 Sema::getTemplateArgumentBindingsText(const TemplateParameterList
*Params
,
5513 const TemplateArgumentList
&Args
) {
5514 // FIXME: For variadic templates, we'll need to get the structured list.
5515 return getTemplateArgumentBindingsText(Params
, Args
.getFlatArgumentList(),
5520 Sema::getTemplateArgumentBindingsText(const TemplateParameterList
*Params
,
5521 const TemplateArgument
*Args
,
5525 if (!Params
|| Params
->size() == 0 || NumArgs
== 0)
5528 for (unsigned I
= 0, N
= Params
->size(); I
!= N
; ++I
) {
5537 if (const IdentifierInfo
*Id
= Params
->getParam(I
)->getIdentifier()) {
5538 Result
+= Id
->getName();
5541 Result
+= llvm::utostr(I
);
5546 switch (Args
[I
].getKind()) {
5547 case TemplateArgument::Null
:
5548 Result
+= "<no value>";
5551 case TemplateArgument::Type
: {
5552 std::string TypeStr
;
5553 Args
[I
].getAsType().getAsStringInternal(TypeStr
,
5554 Context
.PrintingPolicy
);
5559 case TemplateArgument::Declaration
: {
5560 bool Unnamed
= true;
5561 if (NamedDecl
*ND
= dyn_cast_or_null
<NamedDecl
>(Args
[I
].getAsDecl())) {
5562 if (ND
->getDeclName()) {
5564 Result
+= ND
->getNameAsString();
5569 Result
+= "<anonymous>";
5574 case TemplateArgument::Template
: {
5576 llvm::raw_string_ostream
OS(Str
);
5577 Args
[I
].getAsTemplate().print(OS
, Context
.PrintingPolicy
);
5582 case TemplateArgument::Integral
: {
5583 Result
+= Args
[I
].getAsIntegral()->toString(10);
5587 case TemplateArgument::Expression
: {
5588 // FIXME: This is non-optimal, since we're regurgitating the
5589 // expression we were given.
5592 llvm::raw_string_ostream
OS(Str
);
5593 Args
[I
].getAsExpr()->printPretty(OS
, Context
, 0,
5594 Context
.PrintingPolicy
);
5600 case TemplateArgument::Pack
:
5601 // FIXME: Format template argument packs
5602 Result
+= "<template argument pack>";