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Douglas Gregor72c3f312008-12-05 18:15:24 +00001//===------- SemaTemplate.cpp - Semantic Analysis for C++ Templates -------===/
Douglas Gregor72c3f312008-12-05 18:15:24 +00002//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Douglas Gregor99ebf652009-02-27 19:31:52 +00007//===----------------------------------------------------------------------===/
Douglas Gregor72c3f312008-12-05 18:15:24 +00008//
9// This file implements semantic analysis for C++ templates.
Douglas Gregor99ebf652009-02-27 19:31:52 +000010//===----------------------------------------------------------------------===/
Douglas Gregor72c3f312008-12-05 18:15:24 +000011
John McCall2d887082010-08-25 22:03:47 +000012#include "clang/Sema/SemaInternal.h"
Douglas Gregore737f502010-08-12 20:07:10 +000013#include "clang/Sema/Lookup.h"
John McCall5f1e0942010-08-24 08:50:51 +000014#include "clang/Sema/Scope.h"
John McCall7cd088e2010-08-24 07:21:54 +000015#include "clang/Sema/Template.h"
John McCall2a7fb272010-08-25 05:32:35 +000016#include "clang/Sema/TemplateDeduction.h"
Douglas Gregor4a959d82009-08-06 16:20:37 +000017#include "TreeTransform.h"
Douglas Gregorddc29e12009-02-06 22:42:48 +000018#include "clang/AST/ASTContext.h"
Douglas Gregor898574e2008-12-05 23:32:09 +000019#include "clang/AST/Expr.h"
Douglas Gregorcc45cb32009-02-11 19:52:55 +000020#include "clang/AST/ExprCXX.h"
John McCall92b7f702010-03-11 07:50:04 +000021#include "clang/AST/DeclFriend.h"
Douglas Gregoraaba5e32009-02-04 19:02:06 +000022#include "clang/AST/DeclTemplate.h"
John McCall4e2cbb22010-10-20 05:44:58 +000023#include "clang/AST/RecursiveASTVisitor.h"
Douglas Gregor5f3aeb62010-10-13 00:27:52 +000024#include "clang/AST/TypeVisitor.h"
John McCall19510852010-08-20 18:27:03 +000025#include "clang/Sema/DeclSpec.h"
26#include "clang/Sema/ParsedTemplate.h"
Douglas Gregor72c3f312008-12-05 18:15:24 +000027#include "clang/Basic/LangOptions.h"
Douglas Gregord5a423b2009-09-25 18:43:00 +000028#include "clang/Basic/PartialDiagnostic.h"
Douglas Gregorbf4ea562009-09-15 16:23:51 +000029#include "llvm/ADT/StringExtras.h"
Douglas Gregor72c3f312008-12-05 18:15:24 +000030using namespace clang;
John McCall2a7fb272010-08-25 05:32:35 +000031using namespace sema;
Douglas Gregor72c3f312008-12-05 18:15:24 +000032
John McCall78b81052010-11-10 02:40:36 +000033// Exported for use by Parser.
34SourceRange
35clang::getTemplateParamsRange(TemplateParameterList const * const *Ps,
36 unsigned N) {
37 if (!N) return SourceRange();
38 return SourceRange(Ps[0]->getTemplateLoc(), Ps[N-1]->getRAngleLoc());
39}
40
Douglas Gregor2dd078a2009-09-02 22:59:36 +000041/// \brief Determine whether the declaration found is acceptable as the name
42/// of a template and, if so, return that template declaration. Otherwise,
43/// returns NULL.
John McCallad00b772010-06-16 08:42:20 +000044static NamedDecl *isAcceptableTemplateName(ASTContext &Context,
45 NamedDecl *Orig) {
46 NamedDecl *D = Orig->getUnderlyingDecl();
Mike Stump1eb44332009-09-09 15:08:12 +000047
Douglas Gregor2dd078a2009-09-02 22:59:36 +000048 if (isa<TemplateDecl>(D))
John McCallad00b772010-06-16 08:42:20 +000049 return Orig;
Mike Stump1eb44332009-09-09 15:08:12 +000050
Douglas Gregor2dd078a2009-09-02 22:59:36 +000051 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
52 // C++ [temp.local]p1:
53 // Like normal (non-template) classes, class templates have an
54 // injected-class-name (Clause 9). The injected-class-name
55 // can be used with or without a template-argument-list. When
56 // it is used without a template-argument-list, it is
57 // equivalent to the injected-class-name followed by the
58 // template-parameters of the class template enclosed in
59 // <>. When it is used with a template-argument-list, it
60 // refers to the specified class template specialization,
61 // which could be the current specialization or another
62 // specialization.
63 if (Record->isInjectedClassName()) {
Douglas Gregor542b5482009-10-14 17:30:58 +000064 Record = cast<CXXRecordDecl>(Record->getDeclContext());
Douglas Gregor2dd078a2009-09-02 22:59:36 +000065 if (Record->getDescribedClassTemplate())
66 return Record->getDescribedClassTemplate();
67
68 if (ClassTemplateSpecializationDecl *Spec
69 = dyn_cast<ClassTemplateSpecializationDecl>(Record))
70 return Spec->getSpecializedTemplate();
71 }
Mike Stump1eb44332009-09-09 15:08:12 +000072
Douglas Gregor2dd078a2009-09-02 22:59:36 +000073 return 0;
74 }
Mike Stump1eb44332009-09-09 15:08:12 +000075
Douglas Gregor2dd078a2009-09-02 22:59:36 +000076 return 0;
77}
78
Douglas Gregor312eadb2011-04-24 05:37:28 +000079void Sema::FilterAcceptableTemplateNames(LookupResult &R) {
Douglas Gregor01e56ae2010-04-12 20:54:26 +000080 // The set of class templates we've already seen.
81 llvm::SmallPtrSet<ClassTemplateDecl *, 8> ClassTemplates;
John McCallf7a1a742009-11-24 19:00:30 +000082 LookupResult::Filter filter = R.makeFilter();
83 while (filter.hasNext()) {
84 NamedDecl *Orig = filter.next();
Douglas Gregor312eadb2011-04-24 05:37:28 +000085 NamedDecl *Repl = isAcceptableTemplateName(Context, Orig);
John McCallf7a1a742009-11-24 19:00:30 +000086 if (!Repl)
87 filter.erase();
Douglas Gregor01e56ae2010-04-12 20:54:26 +000088 else if (Repl != Orig) {
89
90 // C++ [temp.local]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +000091 // A lookup that finds an injected-class-name (10.2) can result in an
Douglas Gregor01e56ae2010-04-12 20:54:26 +000092 // ambiguity in certain cases (for example, if it is found in more than
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +000093 // one base class). If all of the injected-class-names that are found
94 // refer to specializations of the same class template, and if the name
Richard Smith3e4c6c42011-05-05 21:57:07 +000095 // is used as a template-name, the reference refers to the class
96 // template itself and not a specialization thereof, and is not
Douglas Gregor01e56ae2010-04-12 20:54:26 +000097 // ambiguous.
Douglas Gregor01e56ae2010-04-12 20:54:26 +000098 if (ClassTemplateDecl *ClassTmpl = dyn_cast<ClassTemplateDecl>(Repl))
99 if (!ClassTemplates.insert(ClassTmpl)) {
100 filter.erase();
101 continue;
102 }
John McCall8ba66912010-08-13 07:02:08 +0000103
104 // FIXME: we promote access to public here as a workaround to
105 // the fact that LookupResult doesn't let us remember that we
106 // found this template through a particular injected class name,
107 // which means we end up doing nasty things to the invariants.
108 // Pretending that access is public is *much* safer.
109 filter.replace(Repl, AS_public);
Douglas Gregor01e56ae2010-04-12 20:54:26 +0000110 }
John McCallf7a1a742009-11-24 19:00:30 +0000111 }
112 filter.done();
113}
114
Douglas Gregor312eadb2011-04-24 05:37:28 +0000115bool Sema::hasAnyAcceptableTemplateNames(LookupResult &R) {
116 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I)
117 if (isAcceptableTemplateName(Context, *I))
118 return true;
119
Douglas Gregor3b887352011-04-27 04:48:22 +0000120 return false;
Douglas Gregor312eadb2011-04-24 05:37:28 +0000121}
122
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000123TemplateNameKind Sema::isTemplateName(Scope *S,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +0000124 CXXScopeSpec &SS,
Abramo Bagnara7c153532010-08-06 12:11:11 +0000125 bool hasTemplateKeyword,
Douglas Gregor014e88d2009-11-03 23:16:33 +0000126 UnqualifiedId &Name,
John McCallb3d87482010-08-24 05:47:05 +0000127 ParsedType ObjectTypePtr,
Douglas Gregor495c35d2009-08-25 22:51:20 +0000128 bool EnteringContext,
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000129 TemplateTy &TemplateResult,
130 bool &MemberOfUnknownSpecialization) {
Douglas Gregorb862b8f2010-01-11 23:29:10 +0000131 assert(getLangOptions().CPlusPlus && "No template names in C!");
132
Douglas Gregor014e88d2009-11-03 23:16:33 +0000133 DeclarationName TName;
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000134 MemberOfUnknownSpecialization = false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000135
Douglas Gregor014e88d2009-11-03 23:16:33 +0000136 switch (Name.getKind()) {
137 case UnqualifiedId::IK_Identifier:
138 TName = DeclarationName(Name.Identifier);
139 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000140
Douglas Gregor014e88d2009-11-03 23:16:33 +0000141 case UnqualifiedId::IK_OperatorFunctionId:
142 TName = Context.DeclarationNames.getCXXOperatorName(
143 Name.OperatorFunctionId.Operator);
144 break;
145
Sean Hunte6252d12009-11-28 08:58:14 +0000146 case UnqualifiedId::IK_LiteralOperatorId:
Sean Hunt3e518bd2009-11-29 07:34:05 +0000147 TName = Context.DeclarationNames.getCXXLiteralOperatorName(Name.Identifier);
148 break;
Sean Hunte6252d12009-11-28 08:58:14 +0000149
Douglas Gregor014e88d2009-11-03 23:16:33 +0000150 default:
151 return TNK_Non_template;
152 }
Mike Stump1eb44332009-09-09 15:08:12 +0000153
John McCallb3d87482010-08-24 05:47:05 +0000154 QualType ObjectType = ObjectTypePtr.get();
Mike Stump1eb44332009-09-09 15:08:12 +0000155
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000156 LookupResult R(*this, TName, Name.getSourceRange().getBegin(),
Douglas Gregorbfea2392009-12-31 08:11:17 +0000157 LookupOrdinaryName);
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000158 LookupTemplateName(R, S, SS, ObjectType, EnteringContext,
159 MemberOfUnknownSpecialization);
John McCall67d22fb2010-08-28 20:17:00 +0000160 if (R.empty()) return TNK_Non_template;
161 if (R.isAmbiguous()) {
162 // Suppress diagnostics; we'll redo this lookup later.
John McCallb8592062010-08-13 02:23:42 +0000163 R.suppressDiagnostics();
John McCall67d22fb2010-08-28 20:17:00 +0000164
165 // FIXME: we might have ambiguous templates, in which case we
166 // should at least parse them properly!
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000167 return TNK_Non_template;
John McCallb8592062010-08-13 02:23:42 +0000168 }
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000169
John McCall0bd6feb2009-12-02 08:04:21 +0000170 TemplateName Template;
171 TemplateNameKind TemplateKind;
Mike Stump1eb44332009-09-09 15:08:12 +0000172
John McCall0bd6feb2009-12-02 08:04:21 +0000173 unsigned ResultCount = R.end() - R.begin();
174 if (ResultCount > 1) {
175 // We assume that we'll preserve the qualifier from a function
176 // template name in other ways.
177 Template = Context.getOverloadedTemplateName(R.begin(), R.end());
178 TemplateKind = TNK_Function_template;
John McCallb8592062010-08-13 02:23:42 +0000179
180 // We'll do this lookup again later.
181 R.suppressDiagnostics();
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000182 } else {
John McCall0bd6feb2009-12-02 08:04:21 +0000183 TemplateDecl *TD = cast<TemplateDecl>((*R.begin())->getUnderlyingDecl());
184
185 if (SS.isSet() && !SS.isInvalid()) {
186 NestedNameSpecifier *Qualifier
187 = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
Abramo Bagnara7c153532010-08-06 12:11:11 +0000188 Template = Context.getQualifiedTemplateName(Qualifier,
189 hasTemplateKeyword, TD);
John McCall0bd6feb2009-12-02 08:04:21 +0000190 } else {
191 Template = TemplateName(TD);
192 }
193
John McCallb8592062010-08-13 02:23:42 +0000194 if (isa<FunctionTemplateDecl>(TD)) {
John McCall0bd6feb2009-12-02 08:04:21 +0000195 TemplateKind = TNK_Function_template;
John McCallb8592062010-08-13 02:23:42 +0000196
197 // We'll do this lookup again later.
198 R.suppressDiagnostics();
199 } else {
Richard Smith3e4c6c42011-05-05 21:57:07 +0000200 assert(isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) ||
201 isa<TypeAliasTemplateDecl>(TD));
John McCall0bd6feb2009-12-02 08:04:21 +0000202 TemplateKind = TNK_Type_template;
203 }
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000204 }
Mike Stump1eb44332009-09-09 15:08:12 +0000205
John McCall0bd6feb2009-12-02 08:04:21 +0000206 TemplateResult = TemplateTy::make(Template);
207 return TemplateKind;
John McCallf7a1a742009-11-24 19:00:30 +0000208}
209
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000210bool Sema::DiagnoseUnknownTemplateName(const IdentifierInfo &II,
Douglas Gregor84d0a192010-01-12 21:28:44 +0000211 SourceLocation IILoc,
212 Scope *S,
213 const CXXScopeSpec *SS,
214 TemplateTy &SuggestedTemplate,
215 TemplateNameKind &SuggestedKind) {
216 // We can't recover unless there's a dependent scope specifier preceding the
217 // template name.
Douglas Gregord5ab9b02010-05-21 23:43:39 +0000218 // FIXME: Typo correction?
Douglas Gregor84d0a192010-01-12 21:28:44 +0000219 if (!SS || !SS->isSet() || !isDependentScopeSpecifier(*SS) ||
220 computeDeclContext(*SS))
221 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000222
Douglas Gregor84d0a192010-01-12 21:28:44 +0000223 // The code is missing a 'template' keyword prior to the dependent template
224 // name.
225 NestedNameSpecifier *Qualifier = (NestedNameSpecifier*)SS->getScopeRep();
226 Diag(IILoc, diag::err_template_kw_missing)
227 << Qualifier << II.getName()
Douglas Gregor849b2432010-03-31 17:46:05 +0000228 << FixItHint::CreateInsertion(IILoc, "template ");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000229 SuggestedTemplate
Douglas Gregor84d0a192010-01-12 21:28:44 +0000230 = TemplateTy::make(Context.getDependentTemplateName(Qualifier, &II));
231 SuggestedKind = TNK_Dependent_template_name;
232 return true;
233}
234
John McCallf7a1a742009-11-24 19:00:30 +0000235void Sema::LookupTemplateName(LookupResult &Found,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +0000236 Scope *S, CXXScopeSpec &SS,
John McCallf7a1a742009-11-24 19:00:30 +0000237 QualType ObjectType,
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000238 bool EnteringContext,
239 bool &MemberOfUnknownSpecialization) {
John McCallf7a1a742009-11-24 19:00:30 +0000240 // Determine where to perform name lookup
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000241 MemberOfUnknownSpecialization = false;
John McCallf7a1a742009-11-24 19:00:30 +0000242 DeclContext *LookupCtx = 0;
243 bool isDependent = false;
244 if (!ObjectType.isNull()) {
245 // This nested-name-specifier occurs in a member access expression, e.g.,
246 // x->B::f, and we are looking into the type of the object.
247 assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist");
248 LookupCtx = computeDeclContext(ObjectType);
249 isDependent = ObjectType->isDependentType();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000250 assert((isDependent || !ObjectType->isIncompleteType()) &&
John McCallf7a1a742009-11-24 19:00:30 +0000251 "Caller should have completed object type");
252 } else if (SS.isSet()) {
253 // This nested-name-specifier occurs after another nested-name-specifier,
254 // so long into the context associated with the prior nested-name-specifier.
255 LookupCtx = computeDeclContext(SS, EnteringContext);
256 isDependent = isDependentScopeSpecifier(SS);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000257
John McCallf7a1a742009-11-24 19:00:30 +0000258 // The declaration context must be complete.
John McCall77bb1aa2010-05-01 00:40:08 +0000259 if (LookupCtx && RequireCompleteDeclContext(SS, LookupCtx))
John McCallf7a1a742009-11-24 19:00:30 +0000260 return;
261 }
262
263 bool ObjectTypeSearchedInScope = false;
264 if (LookupCtx) {
265 // Perform "qualified" name lookup into the declaration context we
266 // computed, which is either the type of the base of a member access
267 // expression or the declaration context associated with a prior
268 // nested-name-specifier.
269 LookupQualifiedName(Found, LookupCtx);
270
271 if (!ObjectType.isNull() && Found.empty()) {
272 // C++ [basic.lookup.classref]p1:
273 // In a class member access expression (5.2.5), if the . or -> token is
274 // immediately followed by an identifier followed by a <, the
275 // identifier must be looked up to determine whether the < is the
276 // beginning of a template argument list (14.2) or a less-than operator.
277 // The identifier is first looked up in the class of the object
278 // expression. If the identifier is not found, it is then looked up in
279 // the context of the entire postfix-expression and shall name a class
280 // or function template.
John McCallf7a1a742009-11-24 19:00:30 +0000281 if (S) LookupName(Found, S);
282 ObjectTypeSearchedInScope = true;
283 }
Douglas Gregorf9f97a02010-07-16 16:54:17 +0000284 } else if (isDependent && (!S || ObjectType.isNull())) {
Douglas Gregor2e933882010-01-12 17:06:20 +0000285 // We cannot look into a dependent object type or nested nme
286 // specifier.
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000287 MemberOfUnknownSpecialization = true;
John McCallf7a1a742009-11-24 19:00:30 +0000288 return;
289 } else {
290 // Perform unqualified name lookup in the current scope.
291 LookupName(Found, S);
292 }
293
Douglas Gregor2e933882010-01-12 17:06:20 +0000294 if (Found.empty() && !isDependent) {
Douglas Gregorbfea2392009-12-31 08:11:17 +0000295 // If we did not find any names, attempt to correct any typos.
296 DeclarationName Name = Found.getLookupName();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000297 if (DeclarationName Corrected = CorrectTypo(Found, S, &SS, LookupCtx,
Douglas Gregor12eb5d62010-06-29 19:27:42 +0000298 false, CTC_CXXCasts)) {
Douglas Gregor312eadb2011-04-24 05:37:28 +0000299 FilterAcceptableTemplateNames(Found);
John McCallad00b772010-06-16 08:42:20 +0000300 if (!Found.empty()) {
Douglas Gregorbfea2392009-12-31 08:11:17 +0000301 if (LookupCtx)
302 Diag(Found.getNameLoc(), diag::err_no_member_template_suggest)
303 << Name << LookupCtx << Found.getLookupName() << SS.getRange()
Douglas Gregor849b2432010-03-31 17:46:05 +0000304 << FixItHint::CreateReplacement(Found.getNameLoc(),
Douglas Gregorbfea2392009-12-31 08:11:17 +0000305 Found.getLookupName().getAsString());
306 else
307 Diag(Found.getNameLoc(), diag::err_no_template_suggest)
308 << Name << Found.getLookupName()
Douglas Gregor849b2432010-03-31 17:46:05 +0000309 << FixItHint::CreateReplacement(Found.getNameLoc(),
Douglas Gregorbfea2392009-12-31 08:11:17 +0000310 Found.getLookupName().getAsString());
Douglas Gregor67dd1d42010-01-07 00:17:44 +0000311 if (TemplateDecl *Template = Found.getAsSingle<TemplateDecl>())
312 Diag(Template->getLocation(), diag::note_previous_decl)
313 << Template->getDeclName();
John McCallad00b772010-06-16 08:42:20 +0000314 }
Douglas Gregorbfea2392009-12-31 08:11:17 +0000315 } else {
316 Found.clear();
Douglas Gregor12eb5d62010-06-29 19:27:42 +0000317 Found.setLookupName(Name);
Douglas Gregorbfea2392009-12-31 08:11:17 +0000318 }
319 }
320
Douglas Gregor312eadb2011-04-24 05:37:28 +0000321 FilterAcceptableTemplateNames(Found);
Douglas Gregorf9f97a02010-07-16 16:54:17 +0000322 if (Found.empty()) {
323 if (isDependent)
324 MemberOfUnknownSpecialization = true;
John McCallf7a1a742009-11-24 19:00:30 +0000325 return;
Douglas Gregorf9f97a02010-07-16 16:54:17 +0000326 }
John McCallf7a1a742009-11-24 19:00:30 +0000327
328 if (S && !ObjectType.isNull() && !ObjectTypeSearchedInScope) {
329 // C++ [basic.lookup.classref]p1:
330 // [...] If the lookup in the class of the object expression finds a
331 // template, the name is also looked up in the context of the entire
332 // postfix-expression and [...]
333 //
334 LookupResult FoundOuter(*this, Found.getLookupName(), Found.getNameLoc(),
335 LookupOrdinaryName);
336 LookupName(FoundOuter, S);
Douglas Gregor312eadb2011-04-24 05:37:28 +0000337 FilterAcceptableTemplateNames(FoundOuter);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000338
John McCallf7a1a742009-11-24 19:00:30 +0000339 if (FoundOuter.empty()) {
340 // - if the name is not found, the name found in the class of the
341 // object expression is used, otherwise
342 } else if (!FoundOuter.getAsSingle<ClassTemplateDecl>()) {
343 // - if the name is found in the context of the entire
344 // postfix-expression and does not name a class template, the name
345 // found in the class of the object expression is used, otherwise
John McCallad00b772010-06-16 08:42:20 +0000346 } else if (!Found.isSuppressingDiagnostics()) {
John McCallf7a1a742009-11-24 19:00:30 +0000347 // - if the name found is a class template, it must refer to the same
348 // entity as the one found in the class of the object expression,
349 // otherwise the program is ill-formed.
350 if (!Found.isSingleResult() ||
351 Found.getFoundDecl()->getCanonicalDecl()
352 != FoundOuter.getFoundDecl()->getCanonicalDecl()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000353 Diag(Found.getNameLoc(),
Jeffrey Yasskin21d07e42010-06-05 01:39:57 +0000354 diag::ext_nested_name_member_ref_lookup_ambiguous)
355 << Found.getLookupName()
356 << ObjectType;
John McCallf7a1a742009-11-24 19:00:30 +0000357 Diag(Found.getRepresentativeDecl()->getLocation(),
358 diag::note_ambig_member_ref_object_type)
359 << ObjectType;
360 Diag(FoundOuter.getFoundDecl()->getLocation(),
361 diag::note_ambig_member_ref_scope);
362
363 // Recover by taking the template that we found in the object
364 // expression's type.
365 }
366 }
367 }
368}
369
John McCall2f841ba2009-12-02 03:53:29 +0000370/// ActOnDependentIdExpression - Handle a dependent id-expression that
371/// was just parsed. This is only possible with an explicit scope
372/// specifier naming a dependent type.
John McCall60d7b3a2010-08-24 06:29:42 +0000373ExprResult
John McCallf7a1a742009-11-24 19:00:30 +0000374Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS,
Abramo Bagnara25777432010-08-11 22:01:17 +0000375 const DeclarationNameInfo &NameInfo,
John McCall2f841ba2009-12-02 03:53:29 +0000376 bool isAddressOfOperand,
John McCallf7a1a742009-11-24 19:00:30 +0000377 const TemplateArgumentListInfo *TemplateArgs) {
John McCallea1471e2010-05-20 01:18:31 +0000378 DeclContext *DC = getFunctionLevelDeclContext();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000379
John McCall2f841ba2009-12-02 03:53:29 +0000380 if (!isAddressOfOperand &&
John McCallea1471e2010-05-20 01:18:31 +0000381 isa<CXXMethodDecl>(DC) &&
382 cast<CXXMethodDecl>(DC)->isInstance()) {
383 QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType(Context);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000384
John McCallf7a1a742009-11-24 19:00:30 +0000385 // Since the 'this' expression is synthesized, we don't need to
386 // perform the double-lookup check.
387 NamedDecl *FirstQualifierInScope = 0;
388
John McCallaa81e162009-12-01 22:10:20 +0000389 return Owned(CXXDependentScopeMemberExpr::Create(Context,
390 /*This*/ 0, ThisType,
391 /*IsArrow*/ true,
John McCallf7a1a742009-11-24 19:00:30 +0000392 /*Op*/ SourceLocation(),
Douglas Gregor7c3179c2011-02-28 18:50:33 +0000393 SS.getWithLocInContext(Context),
John McCallf7a1a742009-11-24 19:00:30 +0000394 FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +0000395 NameInfo,
John McCallf7a1a742009-11-24 19:00:30 +0000396 TemplateArgs));
397 }
398
Abramo Bagnara25777432010-08-11 22:01:17 +0000399 return BuildDependentDeclRefExpr(SS, NameInfo, TemplateArgs);
John McCallf7a1a742009-11-24 19:00:30 +0000400}
401
John McCall60d7b3a2010-08-24 06:29:42 +0000402ExprResult
John McCallf7a1a742009-11-24 19:00:30 +0000403Sema::BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
Abramo Bagnara25777432010-08-11 22:01:17 +0000404 const DeclarationNameInfo &NameInfo,
John McCallf7a1a742009-11-24 19:00:30 +0000405 const TemplateArgumentListInfo *TemplateArgs) {
406 return Owned(DependentScopeDeclRefExpr::Create(Context,
Douglas Gregor00cf3cc2011-02-25 20:49:16 +0000407 SS.getWithLocInContext(Context),
Abramo Bagnara25777432010-08-11 22:01:17 +0000408 NameInfo,
John McCallf7a1a742009-11-24 19:00:30 +0000409 TemplateArgs));
Douglas Gregord6fb7ef2008-12-18 19:37:40 +0000410}
411
Douglas Gregor72c3f312008-12-05 18:15:24 +0000412/// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining
413/// that the template parameter 'PrevDecl' is being shadowed by a new
414/// declaration at location Loc. Returns true to indicate that this is
415/// an error, and false otherwise.
416bool Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl) {
Douglas Gregorf57172b2008-12-08 18:40:42 +0000417 assert(PrevDecl->isTemplateParameter() && "Not a template parameter");
Douglas Gregor72c3f312008-12-05 18:15:24 +0000418
419 // Microsoft Visual C++ permits template parameters to be shadowed.
420 if (getLangOptions().Microsoft)
421 return false;
422
423 // C++ [temp.local]p4:
424 // A template-parameter shall not be redeclared within its
425 // scope (including nested scopes).
Mike Stump1eb44332009-09-09 15:08:12 +0000426 Diag(Loc, diag::err_template_param_shadow)
Douglas Gregor72c3f312008-12-05 18:15:24 +0000427 << cast<NamedDecl>(PrevDecl)->getDeclName();
428 Diag(PrevDecl->getLocation(), diag::note_template_param_here);
429 return true;
430}
431
Douglas Gregor2943aed2009-03-03 04:44:36 +0000432/// AdjustDeclIfTemplate - If the given decl happens to be a template, reset
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000433/// the parameter D to reference the templated declaration and return a pointer
434/// to the template declaration. Otherwise, do nothing to D and return null.
John McCalld226f652010-08-21 09:40:31 +0000435TemplateDecl *Sema::AdjustDeclIfTemplate(Decl *&D) {
436 if (TemplateDecl *Temp = dyn_cast_or_null<TemplateDecl>(D)) {
437 D = Temp->getTemplatedDecl();
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000438 return Temp;
439 }
440 return 0;
441}
442
Douglas Gregorba68eca2011-01-05 17:40:24 +0000443ParsedTemplateArgument ParsedTemplateArgument::getTemplatePackExpansion(
444 SourceLocation EllipsisLoc) const {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000445 assert(Kind == Template &&
Douglas Gregorba68eca2011-01-05 17:40:24 +0000446 "Only template template arguments can be pack expansions here");
447 assert(getAsTemplate().get().containsUnexpandedParameterPack() &&
448 "Template template argument pack expansion without packs");
449 ParsedTemplateArgument Result(*this);
450 Result.EllipsisLoc = EllipsisLoc;
451 return Result;
452}
453
Douglas Gregor788cd062009-11-11 01:00:40 +0000454static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef,
455 const ParsedTemplateArgument &Arg) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000456
Douglas Gregor788cd062009-11-11 01:00:40 +0000457 switch (Arg.getKind()) {
458 case ParsedTemplateArgument::Type: {
John McCalla93c9342009-12-07 02:54:59 +0000459 TypeSourceInfo *DI;
Douglas Gregor788cd062009-11-11 01:00:40 +0000460 QualType T = SemaRef.GetTypeFromParser(Arg.getAsType(), &DI);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000461 if (!DI)
John McCalla93c9342009-12-07 02:54:59 +0000462 DI = SemaRef.Context.getTrivialTypeSourceInfo(T, Arg.getLocation());
Douglas Gregor788cd062009-11-11 01:00:40 +0000463 return TemplateArgumentLoc(TemplateArgument(T), DI);
464 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000465
Douglas Gregor788cd062009-11-11 01:00:40 +0000466 case ParsedTemplateArgument::NonType: {
467 Expr *E = static_cast<Expr *>(Arg.getAsExpr());
468 return TemplateArgumentLoc(TemplateArgument(E), E);
469 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000470
Douglas Gregor788cd062009-11-11 01:00:40 +0000471 case ParsedTemplateArgument::Template: {
John McCall2b5289b2010-08-23 07:28:44 +0000472 TemplateName Template = Arg.getAsTemplate().get();
Douglas Gregor2be29f42011-01-14 23:41:42 +0000473 TemplateArgument TArg;
474 if (Arg.getEllipsisLoc().isValid())
475 TArg = TemplateArgument(Template, llvm::Optional<unsigned int>());
476 else
477 TArg = Template;
478 return TemplateArgumentLoc(TArg,
Douglas Gregorb6744ef2011-03-02 17:09:35 +0000479 Arg.getScopeSpec().getWithLocInContext(
480 SemaRef.Context),
Douglas Gregorba68eca2011-01-05 17:40:24 +0000481 Arg.getLocation(),
482 Arg.getEllipsisLoc());
Douglas Gregor788cd062009-11-11 01:00:40 +0000483 }
484 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000485
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +0000486 llvm_unreachable("Unhandled parsed template argument");
Douglas Gregor788cd062009-11-11 01:00:40 +0000487 return TemplateArgumentLoc();
488}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000489
Douglas Gregor788cd062009-11-11 01:00:40 +0000490/// \brief Translates template arguments as provided by the parser
491/// into template arguments used by semantic analysis.
John McCalld5532b62009-11-23 01:53:49 +0000492void Sema::translateTemplateArguments(const ASTTemplateArgsPtr &TemplateArgsIn,
493 TemplateArgumentListInfo &TemplateArgs) {
Douglas Gregor788cd062009-11-11 01:00:40 +0000494 for (unsigned I = 0, Last = TemplateArgsIn.size(); I != Last; ++I)
John McCalld5532b62009-11-23 01:53:49 +0000495 TemplateArgs.addArgument(translateTemplateArgument(*this,
496 TemplateArgsIn[I]));
Douglas Gregor788cd062009-11-11 01:00:40 +0000497}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000498
Douglas Gregor72c3f312008-12-05 18:15:24 +0000499/// ActOnTypeParameter - Called when a C++ template type parameter
500/// (e.g., "typename T") has been parsed. Typename specifies whether
501/// the keyword "typename" was used to declare the type parameter
502/// (otherwise, "class" was used), and KeyLoc is the location of the
503/// "class" or "typename" keyword. ParamName is the name of the
504/// parameter (NULL indicates an unnamed template parameter) and
Chandler Carruth4fb86f82011-05-01 00:51:33 +0000505/// ParamNameLoc is the location of the parameter name (if any).
Douglas Gregor72c3f312008-12-05 18:15:24 +0000506/// If the type parameter has a default argument, it will be added
507/// later via ActOnTypeParameterDefault.
John McCalld226f652010-08-21 09:40:31 +0000508Decl *Sema::ActOnTypeParameter(Scope *S, bool Typename, bool Ellipsis,
509 SourceLocation EllipsisLoc,
510 SourceLocation KeyLoc,
511 IdentifierInfo *ParamName,
512 SourceLocation ParamNameLoc,
513 unsigned Depth, unsigned Position,
514 SourceLocation EqualLoc,
John McCallb3d87482010-08-24 05:47:05 +0000515 ParsedType DefaultArg) {
Mike Stump1eb44332009-09-09 15:08:12 +0000516 assert(S->isTemplateParamScope() &&
517 "Template type parameter not in template parameter scope!");
Douglas Gregor72c3f312008-12-05 18:15:24 +0000518 bool Invalid = false;
519
520 if (ParamName) {
Douglas Gregorc83c6872010-04-15 22:33:43 +0000521 NamedDecl *PrevDecl = LookupSingleName(S, ParamName, ParamNameLoc,
Douglas Gregorc0b39642010-04-15 23:40:53 +0000522 LookupOrdinaryName,
523 ForRedeclaration);
Douglas Gregorf57172b2008-12-08 18:40:42 +0000524 if (PrevDecl && PrevDecl->isTemplateParameter())
Douglas Gregor72c3f312008-12-05 18:15:24 +0000525 Invalid = Invalid || DiagnoseTemplateParameterShadow(ParamNameLoc,
Mike Stump1eb44332009-09-09 15:08:12 +0000526 PrevDecl);
Douglas Gregor72c3f312008-12-05 18:15:24 +0000527 }
528
Douglas Gregorddc29e12009-02-06 22:42:48 +0000529 SourceLocation Loc = ParamNameLoc;
530 if (!ParamName)
531 Loc = KeyLoc;
532
Douglas Gregor72c3f312008-12-05 18:15:24 +0000533 TemplateTypeParmDecl *Param
John McCall7a9813c2010-01-22 00:28:27 +0000534 = TemplateTypeParmDecl::Create(Context, Context.getTranslationUnitDecl(),
Abramo Bagnara344577e2011-03-06 15:48:19 +0000535 KeyLoc, Loc, Depth, Position, ParamName,
536 Typename, Ellipsis);
Douglas Gregor9a299e02011-03-04 17:52:15 +0000537 Param->setAccess(AS_public);
Douglas Gregor72c3f312008-12-05 18:15:24 +0000538 if (Invalid)
539 Param->setInvalidDecl();
540
541 if (ParamName) {
542 // Add the template parameter into the current scope.
John McCalld226f652010-08-21 09:40:31 +0000543 S->AddDecl(Param);
Douglas Gregor72c3f312008-12-05 18:15:24 +0000544 IdResolver.AddDecl(Param);
545 }
546
Douglas Gregor61c4d282011-01-05 15:48:55 +0000547 // C++0x [temp.param]p9:
548 // A default template-argument may be specified for any kind of
549 // template-parameter that is not a template parameter pack.
550 if (DefaultArg && Ellipsis) {
551 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
552 DefaultArg = ParsedType();
553 }
554
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000555 // Handle the default argument, if provided.
556 if (DefaultArg) {
557 TypeSourceInfo *DefaultTInfo;
558 GetTypeFromParser(DefaultArg, &DefaultTInfo);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000559
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000560 assert(DefaultTInfo && "expected source information for type");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000561
Douglas Gregor6f526752010-12-16 08:48:57 +0000562 // Check for unexpanded parameter packs.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000563 if (DiagnoseUnexpandedParameterPack(Loc, DefaultTInfo,
Douglas Gregor6f526752010-12-16 08:48:57 +0000564 UPPC_DefaultArgument))
565 return Param;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000566
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000567 // Check the template argument itself.
568 if (CheckTemplateArgument(Param, DefaultTInfo)) {
569 Param->setInvalidDecl();
John McCalld226f652010-08-21 09:40:31 +0000570 return Param;
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000571 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000572
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000573 Param->setDefaultArgument(DefaultTInfo, false);
574 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000575
John McCalld226f652010-08-21 09:40:31 +0000576 return Param;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000577}
578
Douglas Gregor2943aed2009-03-03 04:44:36 +0000579/// \brief Check that the type of a non-type template parameter is
580/// well-formed.
581///
582/// \returns the (possibly-promoted) parameter type if valid;
583/// otherwise, produces a diagnostic and returns a NULL type.
Mike Stump1eb44332009-09-09 15:08:12 +0000584QualType
Douglas Gregor2943aed2009-03-03 04:44:36 +0000585Sema::CheckNonTypeTemplateParameterType(QualType T, SourceLocation Loc) {
Douglas Gregora481ec42010-05-23 19:57:01 +0000586 // We don't allow variably-modified types as the type of non-type template
587 // parameters.
588 if (T->isVariablyModifiedType()) {
589 Diag(Loc, diag::err_variably_modified_nontype_template_param)
590 << T;
591 return QualType();
592 }
593
Douglas Gregor2943aed2009-03-03 04:44:36 +0000594 // C++ [temp.param]p4:
595 //
596 // A non-type template-parameter shall have one of the following
597 // (optionally cv-qualified) types:
598 //
599 // -- integral or enumeration type,
Douglas Gregor2ade35e2010-06-16 00:17:44 +0000600 if (T->isIntegralOrEnumerationType() ||
Mike Stump1eb44332009-09-09 15:08:12 +0000601 // -- pointer to object or pointer to function,
Eli Friedman13578692010-08-05 02:49:48 +0000602 T->isPointerType() ||
Mike Stump1eb44332009-09-09 15:08:12 +0000603 // -- reference to object or reference to function,
Douglas Gregor2943aed2009-03-03 04:44:36 +0000604 T->isReferenceType() ||
Douglas Gregor84ee2ee2011-05-21 23:15:46 +0000605 // -- pointer to member,
Douglas Gregor2943aed2009-03-03 04:44:36 +0000606 T->isMemberPointerType() ||
Douglas Gregor84ee2ee2011-05-21 23:15:46 +0000607 // -- std::nullptr_t.
608 T->isNullPtrType() ||
Douglas Gregor2943aed2009-03-03 04:44:36 +0000609 // If T is a dependent type, we can't do the check now, so we
610 // assume that it is well-formed.
611 T->isDependentType())
612 return T;
613 // C++ [temp.param]p8:
614 //
615 // A non-type template-parameter of type "array of T" or
616 // "function returning T" is adjusted to be of type "pointer to
617 // T" or "pointer to function returning T", respectively.
618 else if (T->isArrayType())
619 // FIXME: Keep the type prior to promotion?
620 return Context.getArrayDecayedType(T);
621 else if (T->isFunctionType())
622 // FIXME: Keep the type prior to promotion?
623 return Context.getPointerType(T);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000624
Douglas Gregor2943aed2009-03-03 04:44:36 +0000625 Diag(Loc, diag::err_template_nontype_parm_bad_type)
626 << T;
627
628 return QualType();
629}
630
John McCalld226f652010-08-21 09:40:31 +0000631Decl *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
632 unsigned Depth,
633 unsigned Position,
634 SourceLocation EqualLoc,
John McCall9ae2f072010-08-23 23:25:46 +0000635 Expr *Default) {
John McCallbf1a0282010-06-04 23:28:52 +0000636 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
637 QualType T = TInfo->getType();
Douglas Gregor72c3f312008-12-05 18:15:24 +0000638
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000639 assert(S->isTemplateParamScope() &&
640 "Non-type template parameter not in template parameter scope!");
Douglas Gregor72c3f312008-12-05 18:15:24 +0000641 bool Invalid = false;
642
643 IdentifierInfo *ParamName = D.getIdentifier();
644 if (ParamName) {
Douglas Gregorc83c6872010-04-15 22:33:43 +0000645 NamedDecl *PrevDecl = LookupSingleName(S, ParamName, D.getIdentifierLoc(),
Douglas Gregorc0b39642010-04-15 23:40:53 +0000646 LookupOrdinaryName,
647 ForRedeclaration);
Douglas Gregorf57172b2008-12-08 18:40:42 +0000648 if (PrevDecl && PrevDecl->isTemplateParameter())
Douglas Gregor72c3f312008-12-05 18:15:24 +0000649 Invalid = Invalid || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000650 PrevDecl);
Douglas Gregor72c3f312008-12-05 18:15:24 +0000651 }
652
Douglas Gregor4d2abba2010-12-16 15:36:43 +0000653 T = CheckNonTypeTemplateParameterType(T, D.getIdentifierLoc());
654 if (T.isNull()) {
Douglas Gregor2943aed2009-03-03 04:44:36 +0000655 T = Context.IntTy; // Recover with an 'int' type.
Douglas Gregorceef30c2009-03-09 16:46:39 +0000656 Invalid = true;
657 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000658
Douglas Gregor10738d32010-12-23 23:51:58 +0000659 bool IsParameterPack = D.hasEllipsis();
Douglas Gregor72c3f312008-12-05 18:15:24 +0000660 NonTypeTemplateParmDecl *Param
John McCall7a9813c2010-01-22 00:28:27 +0000661 = NonTypeTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
Abramo Bagnaraff676cb2011-03-08 08:55:46 +0000662 D.getSourceRange().getBegin(),
John McCall7a9813c2010-01-22 00:28:27 +0000663 D.getIdentifierLoc(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000664 Depth, Position, ParamName, T,
Douglas Gregor10738d32010-12-23 23:51:58 +0000665 IsParameterPack, TInfo);
Douglas Gregor9a299e02011-03-04 17:52:15 +0000666 Param->setAccess(AS_public);
667
Douglas Gregor72c3f312008-12-05 18:15:24 +0000668 if (Invalid)
669 Param->setInvalidDecl();
670
671 if (D.getIdentifier()) {
672 // Add the template parameter into the current scope.
John McCalld226f652010-08-21 09:40:31 +0000673 S->AddDecl(Param);
Douglas Gregor72c3f312008-12-05 18:15:24 +0000674 IdResolver.AddDecl(Param);
675 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000676
Douglas Gregor61c4d282011-01-05 15:48:55 +0000677 // C++0x [temp.param]p9:
678 // A default template-argument may be specified for any kind of
679 // template-parameter that is not a template parameter pack.
680 if (Default && IsParameterPack) {
681 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
682 Default = 0;
683 }
684
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000685 // Check the well-formedness of the default template argument, if provided.
Douglas Gregor10738d32010-12-23 23:51:58 +0000686 if (Default) {
Douglas Gregor6f526752010-12-16 08:48:57 +0000687 // Check for unexpanded parameter packs.
688 if (DiagnoseUnexpandedParameterPack(Default, UPPC_DefaultArgument))
689 return Param;
690
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000691 TemplateArgument Converted;
John Wiegley429bb272011-04-08 18:41:53 +0000692 ExprResult DefaultRes = CheckTemplateArgument(Param, Param->getType(), Default, Converted);
693 if (DefaultRes.isInvalid()) {
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000694 Param->setInvalidDecl();
John McCalld226f652010-08-21 09:40:31 +0000695 return Param;
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000696 }
John Wiegley429bb272011-04-08 18:41:53 +0000697 Default = DefaultRes.take();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000698
John McCall9ae2f072010-08-23 23:25:46 +0000699 Param->setDefaultArgument(Default, false);
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000700 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000701
John McCalld226f652010-08-21 09:40:31 +0000702 return Param;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000703}
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000704
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000705/// ActOnTemplateTemplateParameter - Called when a C++ template template
706/// parameter (e.g. T in template <template <typename> class T> class array)
707/// has been parsed. S is the current scope.
John McCalld226f652010-08-21 09:40:31 +0000708Decl *Sema::ActOnTemplateTemplateParameter(Scope* S,
709 SourceLocation TmpLoc,
710 TemplateParamsTy *Params,
Douglas Gregor61c4d282011-01-05 15:48:55 +0000711 SourceLocation EllipsisLoc,
John McCalld226f652010-08-21 09:40:31 +0000712 IdentifierInfo *Name,
713 SourceLocation NameLoc,
714 unsigned Depth,
715 unsigned Position,
716 SourceLocation EqualLoc,
Douglas Gregor61c4d282011-01-05 15:48:55 +0000717 ParsedTemplateArgument Default) {
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000718 assert(S->isTemplateParamScope() &&
719 "Template template parameter not in template parameter scope!");
720
721 // Construct the parameter object.
Douglas Gregor61c4d282011-01-05 15:48:55 +0000722 bool IsParameterPack = EllipsisLoc.isValid();
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000723 TemplateTemplateParmDecl *Param =
John McCall7a9813c2010-01-22 00:28:27 +0000724 TemplateTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000725 NameLoc.isInvalid()? TmpLoc : NameLoc,
726 Depth, Position, IsParameterPack,
Douglas Gregor61c4d282011-01-05 15:48:55 +0000727 Name, Params);
Douglas Gregor9a299e02011-03-04 17:52:15 +0000728 Param->setAccess(AS_public);
729
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000730 // If the template template parameter has a name, then link the identifier
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000731 // into the scope and lookup mechanisms.
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000732 if (Name) {
John McCalld226f652010-08-21 09:40:31 +0000733 S->AddDecl(Param);
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000734 IdResolver.AddDecl(Param);
735 }
736
Douglas Gregor6f526752010-12-16 08:48:57 +0000737 if (Params->size() == 0) {
738 Diag(Param->getLocation(), diag::err_template_template_parm_no_parms)
739 << SourceRange(Params->getLAngleLoc(), Params->getRAngleLoc());
740 Param->setInvalidDecl();
741 }
742
Douglas Gregor61c4d282011-01-05 15:48:55 +0000743 // C++0x [temp.param]p9:
744 // A default template-argument may be specified for any kind of
745 // template-parameter that is not a template parameter pack.
746 if (IsParameterPack && !Default.isInvalid()) {
747 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
748 Default = ParsedTemplateArgument();
749 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000750
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000751 if (!Default.isInvalid()) {
752 // Check only that we have a template template argument. We don't want to
753 // try to check well-formedness now, because our template template parameter
754 // might have dependent types in its template parameters, which we wouldn't
755 // be able to match now.
756 //
757 // If none of the template template parameter's template arguments mention
758 // other template parameters, we could actually perform more checking here.
759 // However, it isn't worth doing.
760 TemplateArgumentLoc DefaultArg = translateTemplateArgument(*this, Default);
761 if (DefaultArg.getArgument().getAsTemplate().isNull()) {
762 Diag(DefaultArg.getLocation(), diag::err_template_arg_not_class_template)
763 << DefaultArg.getSourceRange();
John McCalld226f652010-08-21 09:40:31 +0000764 return Param;
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000765 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000766
Douglas Gregor6f526752010-12-16 08:48:57 +0000767 // Check for unexpanded parameter packs.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000768 if (DiagnoseUnexpandedParameterPack(DefaultArg.getLocation(),
Douglas Gregor6f526752010-12-16 08:48:57 +0000769 DefaultArg.getArgument().getAsTemplate(),
770 UPPC_DefaultArgument))
771 return Param;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000772
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000773 Param->setDefaultArgument(DefaultArg, false);
Douglas Gregord684b002009-02-10 19:49:53 +0000774 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000775
John McCalld226f652010-08-21 09:40:31 +0000776 return Param;
Douglas Gregord684b002009-02-10 19:49:53 +0000777}
778
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000779/// ActOnTemplateParameterList - Builds a TemplateParameterList that
780/// contains the template parameters in Params/NumParams.
781Sema::TemplateParamsTy *
782Sema::ActOnTemplateParameterList(unsigned Depth,
783 SourceLocation ExportLoc,
Mike Stump1eb44332009-09-09 15:08:12 +0000784 SourceLocation TemplateLoc,
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000785 SourceLocation LAngleLoc,
John McCalld226f652010-08-21 09:40:31 +0000786 Decl **Params, unsigned NumParams,
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000787 SourceLocation RAngleLoc) {
788 if (ExportLoc.isValid())
Douglas Gregor51ffb0c2009-11-25 18:55:14 +0000789 Diag(ExportLoc, diag::warn_template_export_unsupported);
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000790
Douglas Gregorddc29e12009-02-06 22:42:48 +0000791 return TemplateParameterList::Create(Context, TemplateLoc, LAngleLoc,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000792 (NamedDecl**)Params, NumParams,
Douglas Gregorbf4ea562009-09-15 16:23:51 +0000793 RAngleLoc);
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000794}
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000795
John McCallb6217662010-03-15 10:12:16 +0000796static void SetNestedNameSpecifier(TagDecl *T, const CXXScopeSpec &SS) {
797 if (SS.isSet())
Douglas Gregorc22b5ff2011-02-25 02:25:35 +0000798 T->setQualifierInfo(SS.getWithLocInContext(T->getASTContext()));
John McCallb6217662010-03-15 10:12:16 +0000799}
800
John McCallf312b1e2010-08-26 23:41:50 +0000801DeclResult
John McCall0f434ec2009-07-31 02:45:11 +0000802Sema::CheckClassTemplate(Scope *S, unsigned TagSpec, TagUseKind TUK,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +0000803 SourceLocation KWLoc, CXXScopeSpec &SS,
Douglas Gregorddc29e12009-02-06 22:42:48 +0000804 IdentifierInfo *Name, SourceLocation NameLoc,
805 AttributeList *Attr,
Douglas Gregor05396e22009-08-25 17:23:04 +0000806 TemplateParameterList *TemplateParams,
Abramo Bagnarac57c17d2011-03-10 13:28:31 +0000807 AccessSpecifier AS,
808 unsigned NumOuterTemplateParamLists,
809 TemplateParameterList** OuterTemplateParamLists) {
Mike Stump1eb44332009-09-09 15:08:12 +0000810 assert(TemplateParams && TemplateParams->size() > 0 &&
Douglas Gregor05396e22009-08-25 17:23:04 +0000811 "No template parameters");
John McCall0f434ec2009-07-31 02:45:11 +0000812 assert(TUK != TUK_Reference && "Can only declare or define class templates");
Douglas Gregord684b002009-02-10 19:49:53 +0000813 bool Invalid = false;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000814
815 // Check that we can declare a template here.
Douglas Gregor05396e22009-08-25 17:23:04 +0000816 if (CheckTemplateDeclScope(S, TemplateParams))
Douglas Gregor212e81c2009-03-25 00:13:59 +0000817 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000818
Abramo Bagnara465d41b2010-05-11 21:36:43 +0000819 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
820 assert(Kind != TTK_Enum && "can't build template of enumerated type");
Douglas Gregorddc29e12009-02-06 22:42:48 +0000821
822 // There is no such thing as an unnamed class template.
823 if (!Name) {
824 Diag(KWLoc, diag::err_template_unnamed_class);
Douglas Gregor212e81c2009-03-25 00:13:59 +0000825 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000826 }
827
828 // Find any previous declaration with this name.
Douglas Gregor05396e22009-08-25 17:23:04 +0000829 DeclContext *SemanticContext;
John McCalla24dc2e2009-11-17 02:14:36 +0000830 LookupResult Previous(*this, Name, NameLoc, LookupOrdinaryName,
John McCall7d384dd2009-11-18 07:57:50 +0000831 ForRedeclaration);
Douglas Gregor05396e22009-08-25 17:23:04 +0000832 if (SS.isNotEmpty() && !SS.isInvalid()) {
833 SemanticContext = computeDeclContext(SS, true);
834 if (!SemanticContext) {
835 // FIXME: Produce a reasonable diagnostic here
836 return true;
837 }
Mike Stump1eb44332009-09-09 15:08:12 +0000838
John McCall77bb1aa2010-05-01 00:40:08 +0000839 if (RequireCompleteDeclContext(SS, SemanticContext))
840 return true;
841
John McCalla24dc2e2009-11-17 02:14:36 +0000842 LookupQualifiedName(Previous, SemanticContext);
Douglas Gregor05396e22009-08-25 17:23:04 +0000843 } else {
844 SemanticContext = CurContext;
John McCalla24dc2e2009-11-17 02:14:36 +0000845 LookupName(Previous, S);
Douglas Gregor05396e22009-08-25 17:23:04 +0000846 }
Mike Stump1eb44332009-09-09 15:08:12 +0000847
Douglas Gregor57265e32010-04-12 16:00:01 +0000848 if (Previous.isAmbiguous())
849 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000850
Douglas Gregorddc29e12009-02-06 22:42:48 +0000851 NamedDecl *PrevDecl = 0;
852 if (Previous.begin() != Previous.end())
Douglas Gregor57265e32010-04-12 16:00:01 +0000853 PrevDecl = (*Previous.begin())->getUnderlyingDecl();
Douglas Gregorddc29e12009-02-06 22:42:48 +0000854
Douglas Gregorddc29e12009-02-06 22:42:48 +0000855 // If there is a previous declaration with the same name, check
856 // whether this is a valid redeclaration.
Mike Stump1eb44332009-09-09 15:08:12 +0000857 ClassTemplateDecl *PrevClassTemplate
Douglas Gregorddc29e12009-02-06 22:42:48 +0000858 = dyn_cast_or_null<ClassTemplateDecl>(PrevDecl);
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000859
860 // We may have found the injected-class-name of a class template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000861 // class template partial specialization, or class template specialization.
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000862 // In these cases, grab the template that is being defined or specialized.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000863 if (!PrevClassTemplate && PrevDecl && isa<CXXRecordDecl>(PrevDecl) &&
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000864 cast<CXXRecordDecl>(PrevDecl)->isInjectedClassName()) {
865 PrevDecl = cast<CXXRecordDecl>(PrevDecl->getDeclContext());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000866 PrevClassTemplate
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000867 = cast<CXXRecordDecl>(PrevDecl)->getDescribedClassTemplate();
868 if (!PrevClassTemplate && isa<ClassTemplateSpecializationDecl>(PrevDecl)) {
869 PrevClassTemplate
870 = cast<ClassTemplateSpecializationDecl>(PrevDecl)
871 ->getSpecializedTemplate();
872 }
873 }
874
John McCall65c49462009-12-18 11:25:59 +0000875 if (TUK == TUK_Friend) {
John McCalle129d442009-12-17 23:21:11 +0000876 // C++ [namespace.memdef]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000877 // [...] When looking for a prior declaration of a class or a function
878 // declared as a friend, and when the name of the friend class or
John McCalle129d442009-12-17 23:21:11 +0000879 // function is neither a qualified name nor a template-id, scopes outside
880 // the innermost enclosing namespace scope are not considered.
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000881 if (!SS.isSet()) {
882 DeclContext *OutermostContext = CurContext;
883 while (!OutermostContext->isFileContext())
884 OutermostContext = OutermostContext->getLookupParent();
John McCall65c49462009-12-18 11:25:59 +0000885
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000886 if (PrevDecl &&
887 (OutermostContext->Equals(PrevDecl->getDeclContext()) ||
888 OutermostContext->Encloses(PrevDecl->getDeclContext()))) {
889 SemanticContext = PrevDecl->getDeclContext();
890 } else {
891 // Declarations in outer scopes don't matter. However, the outermost
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000892 // context we computed is the semantic context for our new
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000893 // declaration.
894 PrevDecl = PrevClassTemplate = 0;
895 SemanticContext = OutermostContext;
896 }
John McCalle129d442009-12-17 23:21:11 +0000897 }
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000898
John McCalle129d442009-12-17 23:21:11 +0000899 if (CurContext->isDependentContext()) {
900 // If this is a dependent context, we don't want to link the friend
901 // class template to the template in scope, because that would perform
902 // checking of the template parameter lists that can't be performed
903 // until the outer context is instantiated.
904 PrevDecl = PrevClassTemplate = 0;
905 }
906 } else if (PrevDecl && !isDeclInScope(PrevDecl, SemanticContext, S))
907 PrevDecl = PrevClassTemplate = 0;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000908
Douglas Gregorddc29e12009-02-06 22:42:48 +0000909 if (PrevClassTemplate) {
910 // Ensure that the template parameter lists are compatible.
911 if (!TemplateParameterListsAreEqual(TemplateParams,
912 PrevClassTemplate->getTemplateParameters(),
Douglas Gregorfb898e12009-11-12 16:20:59 +0000913 /*Complain=*/true,
914 TPL_TemplateMatch))
Douglas Gregor212e81c2009-03-25 00:13:59 +0000915 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000916
917 // C++ [temp.class]p4:
918 // In a redeclaration, partial specialization, explicit
919 // specialization or explicit instantiation of a class template,
920 // the class-key shall agree in kind with the original class
921 // template declaration (7.1.5.3).
922 RecordDecl *PrevRecordDecl = PrevClassTemplate->getTemplatedDecl();
Richard Trieubbf34c02011-06-10 03:11:26 +0000923 if (!isAcceptableTagRedeclaration(PrevRecordDecl, Kind,
924 TUK == TUK_Definition, KWLoc, *Name)) {
Mike Stump1eb44332009-09-09 15:08:12 +0000925 Diag(KWLoc, diag::err_use_with_wrong_tag)
Douglas Gregora3a83512009-04-01 23:51:29 +0000926 << Name
Douglas Gregor849b2432010-03-31 17:46:05 +0000927 << FixItHint::CreateReplacement(KWLoc, PrevRecordDecl->getKindName());
Douglas Gregorddc29e12009-02-06 22:42:48 +0000928 Diag(PrevRecordDecl->getLocation(), diag::note_previous_use);
Douglas Gregora3a83512009-04-01 23:51:29 +0000929 Kind = PrevRecordDecl->getTagKind();
Douglas Gregorddc29e12009-02-06 22:42:48 +0000930 }
931
Douglas Gregorddc29e12009-02-06 22:42:48 +0000932 // Check for redefinition of this class template.
John McCall0f434ec2009-07-31 02:45:11 +0000933 if (TUK == TUK_Definition) {
Douglas Gregor952b0172010-02-11 01:04:33 +0000934 if (TagDecl *Def = PrevRecordDecl->getDefinition()) {
Douglas Gregorddc29e12009-02-06 22:42:48 +0000935 Diag(NameLoc, diag::err_redefinition) << Name;
936 Diag(Def->getLocation(), diag::note_previous_definition);
937 // FIXME: Would it make sense to try to "forget" the previous
938 // definition, as part of error recovery?
Douglas Gregor212e81c2009-03-25 00:13:59 +0000939 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000940 }
941 }
942 } else if (PrevDecl && PrevDecl->isTemplateParameter()) {
943 // Maybe we will complain about the shadowed template parameter.
944 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl);
945 // Just pretend that we didn't see the previous declaration.
946 PrevDecl = 0;
947 } else if (PrevDecl) {
948 // C++ [temp]p5:
949 // A class template shall not have the same name as any other
950 // template, class, function, object, enumeration, enumerator,
951 // namespace, or type in the same scope (3.3), except as specified
952 // in (14.5.4).
953 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
954 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
Douglas Gregor212e81c2009-03-25 00:13:59 +0000955 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000956 }
957
Douglas Gregord684b002009-02-10 19:49:53 +0000958 // Check the template parameter list of this declaration, possibly
959 // merging in the template parameter list from the previous class
960 // template declaration.
961 if (CheckTemplateParameterList(TemplateParams,
Douglas Gregor5b6d70e2009-11-25 17:50:39 +0000962 PrevClassTemplate? PrevClassTemplate->getTemplateParameters() : 0,
Douglas Gregord89d86f2011-02-04 04:20:44 +0000963 (SS.isSet() && SemanticContext &&
Douglas Gregor461bf2e2011-02-04 12:22:53 +0000964 SemanticContext->isRecord() &&
965 SemanticContext->isDependentContext())
Douglas Gregord89d86f2011-02-04 04:20:44 +0000966 ? TPC_ClassTemplateMember
967 : TPC_ClassTemplate))
Douglas Gregord684b002009-02-10 19:49:53 +0000968 Invalid = true;
Mike Stump1eb44332009-09-09 15:08:12 +0000969
Douglas Gregor57265e32010-04-12 16:00:01 +0000970 if (SS.isSet()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000971 // If the name of the template was qualified, we must be defining the
Douglas Gregor57265e32010-04-12 16:00:01 +0000972 // template out-of-line.
973 if (!SS.isInvalid() && !Invalid && !PrevClassTemplate &&
974 !(TUK == TUK_Friend && CurContext->isDependentContext()))
975 Diag(NameLoc, diag::err_member_def_does_not_match)
976 << Name << SemanticContext << SS.getRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000977 }
978
Mike Stump1eb44332009-09-09 15:08:12 +0000979 CXXRecordDecl *NewClass =
Abramo Bagnaraba877ad2011-03-09 14:09:51 +0000980 CXXRecordDecl::Create(Context, Kind, SemanticContext, KWLoc, NameLoc, Name,
Mike Stump1eb44332009-09-09 15:08:12 +0000981 PrevClassTemplate?
Douglas Gregoraafc0cc2009-05-15 19:11:46 +0000982 PrevClassTemplate->getTemplatedDecl() : 0,
983 /*DelayTypeCreation=*/true);
John McCallb6217662010-03-15 10:12:16 +0000984 SetNestedNameSpecifier(NewClass, SS);
Abramo Bagnarac57c17d2011-03-10 13:28:31 +0000985 if (NumOuterTemplateParamLists > 0)
986 NewClass->setTemplateParameterListsInfo(Context,
987 NumOuterTemplateParamLists,
988 OuterTemplateParamLists);
Douglas Gregorddc29e12009-02-06 22:42:48 +0000989
990 ClassTemplateDecl *NewTemplate
991 = ClassTemplateDecl::Create(Context, SemanticContext, NameLoc,
992 DeclarationName(Name), TemplateParams,
Douglas Gregor5953d8b2009-03-19 17:26:29 +0000993 NewClass, PrevClassTemplate);
Douglas Gregorbefc20e2009-03-26 00:10:35 +0000994 NewClass->setDescribedClassTemplate(NewTemplate);
995
Douglas Gregoraafc0cc2009-05-15 19:11:46 +0000996 // Build the type for the class template declaration now.
Douglas Gregor24bae922010-07-08 18:37:38 +0000997 QualType T = NewTemplate->getInjectedClassNameSpecialization();
John McCall3cb0ebd2010-03-10 03:28:59 +0000998 T = Context.getInjectedClassNameType(NewClass, T);
Douglas Gregoraafc0cc2009-05-15 19:11:46 +0000999 assert(T->isDependentType() && "Class template type is not dependent?");
1000 (void)T;
1001
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001002 // If we are providing an explicit specialization of a member that is a
Douglas Gregorfd056bc2009-10-13 16:30:37 +00001003 // class template, make a note of that.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001004 if (PrevClassTemplate &&
Douglas Gregorfd056bc2009-10-13 16:30:37 +00001005 PrevClassTemplate->getInstantiatedFromMemberTemplate())
1006 PrevClassTemplate->setMemberSpecialization();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001007
Anders Carlsson4cbe82c2009-03-26 01:24:28 +00001008 // Set the access specifier.
Douglas Gregord85bea22009-09-26 06:47:28 +00001009 if (!Invalid && TUK != TUK_Friend)
John McCall05b23ea2009-09-14 21:59:20 +00001010 SetMemberAccessSpecifier(NewTemplate, PrevClassTemplate, AS);
Mike Stump1eb44332009-09-09 15:08:12 +00001011
Douglas Gregorddc29e12009-02-06 22:42:48 +00001012 // Set the lexical context of these templates
1013 NewClass->setLexicalDeclContext(CurContext);
1014 NewTemplate->setLexicalDeclContext(CurContext);
1015
John McCall0f434ec2009-07-31 02:45:11 +00001016 if (TUK == TUK_Definition)
Douglas Gregorddc29e12009-02-06 22:42:48 +00001017 NewClass->startDefinition();
1018
1019 if (Attr)
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00001020 ProcessDeclAttributeList(S, NewClass, Attr);
Douglas Gregorddc29e12009-02-06 22:42:48 +00001021
John McCall05b23ea2009-09-14 21:59:20 +00001022 if (TUK != TUK_Friend)
1023 PushOnScopeChains(NewTemplate, S);
1024 else {
Douglas Gregord85bea22009-09-26 06:47:28 +00001025 if (PrevClassTemplate && PrevClassTemplate->getAccess() != AS_none) {
John McCall05b23ea2009-09-14 21:59:20 +00001026 NewTemplate->setAccess(PrevClassTemplate->getAccess());
Douglas Gregord85bea22009-09-26 06:47:28 +00001027 NewClass->setAccess(PrevClassTemplate->getAccess());
1028 }
John McCall05b23ea2009-09-14 21:59:20 +00001029
Douglas Gregord85bea22009-09-26 06:47:28 +00001030 NewTemplate->setObjectOfFriendDecl(/* PreviouslyDeclared = */
1031 PrevClassTemplate != NULL);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001032
John McCall05b23ea2009-09-14 21:59:20 +00001033 // Friend templates are visible in fairly strange ways.
1034 if (!CurContext->isDependentContext()) {
Sebastian Redl7a126a42010-08-31 00:36:30 +00001035 DeclContext *DC = SemanticContext->getRedeclContext();
John McCall05b23ea2009-09-14 21:59:20 +00001036 DC->makeDeclVisibleInContext(NewTemplate, /* Recoverable = */ false);
1037 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
1038 PushOnScopeChains(NewTemplate, EnclosingScope,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001039 /* AddToContext = */ false);
John McCall05b23ea2009-09-14 21:59:20 +00001040 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001041
Douglas Gregord85bea22009-09-26 06:47:28 +00001042 FriendDecl *Friend = FriendDecl::Create(Context, CurContext,
1043 NewClass->getLocation(),
1044 NewTemplate,
1045 /*FIXME:*/NewClass->getLocation());
1046 Friend->setAccess(AS_public);
1047 CurContext->addDecl(Friend);
John McCall05b23ea2009-09-14 21:59:20 +00001048 }
Douglas Gregorddc29e12009-02-06 22:42:48 +00001049
Douglas Gregord684b002009-02-10 19:49:53 +00001050 if (Invalid) {
1051 NewTemplate->setInvalidDecl();
1052 NewClass->setInvalidDecl();
1053 }
John McCalld226f652010-08-21 09:40:31 +00001054 return NewTemplate;
Douglas Gregorddc29e12009-02-06 22:42:48 +00001055}
1056
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001057/// \brief Diagnose the presence of a default template argument on a
1058/// template parameter, which is ill-formed in certain contexts.
1059///
1060/// \returns true if the default template argument should be dropped.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001061static bool DiagnoseDefaultTemplateArgument(Sema &S,
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001062 Sema::TemplateParamListContext TPC,
1063 SourceLocation ParamLoc,
1064 SourceRange DefArgRange) {
1065 switch (TPC) {
1066 case Sema::TPC_ClassTemplate:
Richard Smith3e4c6c42011-05-05 21:57:07 +00001067 case Sema::TPC_TypeAliasTemplate:
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001068 return false;
1069
1070 case Sema::TPC_FunctionTemplate:
Douglas Gregord89d86f2011-02-04 04:20:44 +00001071 case Sema::TPC_FriendFunctionTemplateDefinition:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001072 // C++ [temp.param]p9:
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001073 // A default template-argument shall not be specified in a
1074 // function template declaration or a function template
1075 // definition [...]
Douglas Gregord89d86f2011-02-04 04:20:44 +00001076 // If a friend function template declaration specifies a default
1077 // template-argument, that declaration shall be a definition and shall be
1078 // the only declaration of the function template in the translation unit.
1079 // (C++98/03 doesn't have this wording; see DR226).
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001080 if (!S.getLangOptions().CPlusPlus0x)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001081 S.Diag(ParamLoc,
Douglas Gregoree5d21f2011-02-04 03:57:22 +00001082 diag::ext_template_parameter_default_in_function_template)
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001083 << DefArgRange;
1084 return false;
1085
1086 case Sema::TPC_ClassTemplateMember:
1087 // C++0x [temp.param]p9:
1088 // A default template-argument shall not be specified in the
1089 // template-parameter-lists of the definition of a member of a
1090 // class template that appears outside of the member's class.
1091 S.Diag(ParamLoc, diag::err_template_parameter_default_template_member)
1092 << DefArgRange;
1093 return true;
1094
1095 case Sema::TPC_FriendFunctionTemplate:
1096 // C++ [temp.param]p9:
1097 // A default template-argument shall not be specified in a
1098 // friend template declaration.
1099 S.Diag(ParamLoc, diag::err_template_parameter_default_friend_template)
1100 << DefArgRange;
1101 return true;
1102
1103 // FIXME: C++0x [temp.param]p9 allows default template-arguments
1104 // for friend function templates if there is only a single
1105 // declaration (and it is a definition). Strange!
1106 }
1107
1108 return false;
1109}
1110
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001111/// \brief Check for unexpanded parameter packs within the template parameters
1112/// of a template template parameter, recursively.
Benjamin Kramerda57f3e2011-03-26 12:38:21 +00001113static bool DiagnoseUnexpandedParameterPacks(Sema &S,
1114 TemplateTemplateParmDecl *TTP) {
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001115 TemplateParameterList *Params = TTP->getTemplateParameters();
1116 for (unsigned I = 0, N = Params->size(); I != N; ++I) {
1117 NamedDecl *P = Params->getParam(I);
1118 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001119 if (S.DiagnoseUnexpandedParameterPack(NTTP->getLocation(),
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001120 NTTP->getTypeSourceInfo(),
1121 Sema::UPPC_NonTypeTemplateParameterType))
1122 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001123
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001124 continue;
1125 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001126
1127 if (TemplateTemplateParmDecl *InnerTTP
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001128 = dyn_cast<TemplateTemplateParmDecl>(P))
1129 if (DiagnoseUnexpandedParameterPacks(S, InnerTTP))
1130 return true;
1131 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001132
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001133 return false;
1134}
1135
Douglas Gregord684b002009-02-10 19:49:53 +00001136/// \brief Checks the validity of a template parameter list, possibly
1137/// considering the template parameter list from a previous
1138/// declaration.
1139///
1140/// If an "old" template parameter list is provided, it must be
1141/// equivalent (per TemplateParameterListsAreEqual) to the "new"
1142/// template parameter list.
1143///
1144/// \param NewParams Template parameter list for a new template
1145/// declaration. This template parameter list will be updated with any
1146/// default arguments that are carried through from the previous
1147/// template parameter list.
1148///
1149/// \param OldParams If provided, template parameter list from a
1150/// previous declaration of the same template. Default template
1151/// arguments will be merged from the old template parameter list to
1152/// the new template parameter list.
1153///
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001154/// \param TPC Describes the context in which we are checking the given
1155/// template parameter list.
1156///
Douglas Gregord684b002009-02-10 19:49:53 +00001157/// \returns true if an error occurred, false otherwise.
1158bool Sema::CheckTemplateParameterList(TemplateParameterList *NewParams,
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001159 TemplateParameterList *OldParams,
1160 TemplateParamListContext TPC) {
Douglas Gregord684b002009-02-10 19:49:53 +00001161 bool Invalid = false;
Mike Stump1eb44332009-09-09 15:08:12 +00001162
Douglas Gregord684b002009-02-10 19:49:53 +00001163 // C++ [temp.param]p10:
1164 // The set of default template-arguments available for use with a
1165 // template declaration or definition is obtained by merging the
1166 // default arguments from the definition (if in scope) and all
1167 // declarations in scope in the same way default function
1168 // arguments are (8.3.6).
1169 bool SawDefaultArgument = false;
1170 SourceLocation PreviousDefaultArgLoc;
Douglas Gregorc15cb382009-02-09 23:23:08 +00001171
Anders Carlsson49d25572009-06-12 23:20:15 +00001172 bool SawParameterPack = false;
1173 SourceLocation ParameterPackLoc;
1174
Mike Stump1a35fde2009-02-11 23:03:27 +00001175 // Dummy initialization to avoid warnings.
Douglas Gregor1bc69132009-02-11 20:46:19 +00001176 TemplateParameterList::iterator OldParam = NewParams->end();
Douglas Gregord684b002009-02-10 19:49:53 +00001177 if (OldParams)
1178 OldParam = OldParams->begin();
1179
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001180 bool RemoveDefaultArguments = false;
Douglas Gregord684b002009-02-10 19:49:53 +00001181 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
1182 NewParamEnd = NewParams->end();
1183 NewParam != NewParamEnd; ++NewParam) {
1184 // Variables used to diagnose redundant default arguments
1185 bool RedundantDefaultArg = false;
1186 SourceLocation OldDefaultLoc;
1187 SourceLocation NewDefaultLoc;
1188
1189 // Variables used to diagnose missing default arguments
1190 bool MissingDefaultArg = false;
1191
Anders Carlsson49d25572009-06-12 23:20:15 +00001192 // C++0x [temp.param]p11:
Richard Smith3e4c6c42011-05-05 21:57:07 +00001193 // If a template parameter of a primary class template or alias template
1194 // is a template parameter pack, it shall be the last template parameter.
1195 if (SawParameterPack &&
1196 (TPC == TPC_ClassTemplate || TPC == TPC_TypeAliasTemplate)) {
Mike Stump1eb44332009-09-09 15:08:12 +00001197 Diag(ParameterPackLoc,
Anders Carlsson49d25572009-06-12 23:20:15 +00001198 diag::err_template_param_pack_must_be_last_template_parameter);
1199 Invalid = true;
1200 }
1201
Douglas Gregord684b002009-02-10 19:49:53 +00001202 if (TemplateTypeParmDecl *NewTypeParm
1203 = dyn_cast<TemplateTypeParmDecl>(*NewParam)) {
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001204 // Check the presence of a default argument here.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001205 if (NewTypeParm->hasDefaultArgument() &&
1206 DiagnoseDefaultTemplateArgument(*this, TPC,
1207 NewTypeParm->getLocation(),
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001208 NewTypeParm->getDefaultArgumentInfo()->getTypeLoc()
Abramo Bagnarabd054db2010-05-20 10:00:11 +00001209 .getSourceRange()))
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001210 NewTypeParm->removeDefaultArgument();
1211
1212 // Merge default arguments for template type parameters.
Mike Stump1eb44332009-09-09 15:08:12 +00001213 TemplateTypeParmDecl *OldTypeParm
Douglas Gregord684b002009-02-10 19:49:53 +00001214 = OldParams? cast<TemplateTypeParmDecl>(*OldParam) : 0;
Mike Stump1eb44332009-09-09 15:08:12 +00001215
Anders Carlsson49d25572009-06-12 23:20:15 +00001216 if (NewTypeParm->isParameterPack()) {
1217 assert(!NewTypeParm->hasDefaultArgument() &&
1218 "Parameter packs can't have a default argument!");
1219 SawParameterPack = true;
1220 ParameterPackLoc = NewTypeParm->getLocation();
Mike Stump1eb44332009-09-09 15:08:12 +00001221 } else if (OldTypeParm && OldTypeParm->hasDefaultArgument() &&
John McCall833ca992009-10-29 08:12:44 +00001222 NewTypeParm->hasDefaultArgument()) {
Douglas Gregord684b002009-02-10 19:49:53 +00001223 OldDefaultLoc = OldTypeParm->getDefaultArgumentLoc();
1224 NewDefaultLoc = NewTypeParm->getDefaultArgumentLoc();
1225 SawDefaultArgument = true;
1226 RedundantDefaultArg = true;
1227 PreviousDefaultArgLoc = NewDefaultLoc;
1228 } else if (OldTypeParm && OldTypeParm->hasDefaultArgument()) {
1229 // Merge the default argument from the old declaration to the
1230 // new declaration.
1231 SawDefaultArgument = true;
John McCall833ca992009-10-29 08:12:44 +00001232 NewTypeParm->setDefaultArgument(OldTypeParm->getDefaultArgumentInfo(),
Douglas Gregord684b002009-02-10 19:49:53 +00001233 true);
1234 PreviousDefaultArgLoc = OldTypeParm->getDefaultArgumentLoc();
1235 } else if (NewTypeParm->hasDefaultArgument()) {
1236 SawDefaultArgument = true;
1237 PreviousDefaultArgLoc = NewTypeParm->getDefaultArgumentLoc();
1238 } else if (SawDefaultArgument)
1239 MissingDefaultArg = true;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00001240 } else if (NonTypeTemplateParmDecl *NewNonTypeParm
Douglas Gregord684b002009-02-10 19:49:53 +00001241 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) {
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001242 // Check for unexpanded parameter packs.
1243 if (DiagnoseUnexpandedParameterPack(NewNonTypeParm->getLocation(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001244 NewNonTypeParm->getTypeSourceInfo(),
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001245 UPPC_NonTypeTemplateParameterType)) {
1246 Invalid = true;
1247 continue;
1248 }
1249
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001250 // Check the presence of a default argument here.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001251 if (NewNonTypeParm->hasDefaultArgument() &&
1252 DiagnoseDefaultTemplateArgument(*this, TPC,
1253 NewNonTypeParm->getLocation(),
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001254 NewNonTypeParm->getDefaultArgument()->getSourceRange())) {
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001255 NewNonTypeParm->removeDefaultArgument();
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001256 }
1257
Mike Stumpac5fc7c2009-08-04 21:02:39 +00001258 // Merge default arguments for non-type template parameters
Douglas Gregord684b002009-02-10 19:49:53 +00001259 NonTypeTemplateParmDecl *OldNonTypeParm
1260 = OldParams? cast<NonTypeTemplateParmDecl>(*OldParam) : 0;
Douglas Gregor1ed64762011-01-05 16:19:19 +00001261 if (NewNonTypeParm->isParameterPack()) {
1262 assert(!NewNonTypeParm->hasDefaultArgument() &&
1263 "Parameter packs can't have a default argument!");
1264 SawParameterPack = true;
1265 ParameterPackLoc = NewNonTypeParm->getLocation();
1266 } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument() &&
Douglas Gregord684b002009-02-10 19:49:53 +00001267 NewNonTypeParm->hasDefaultArgument()) {
1268 OldDefaultLoc = OldNonTypeParm->getDefaultArgumentLoc();
1269 NewDefaultLoc = NewNonTypeParm->getDefaultArgumentLoc();
1270 SawDefaultArgument = true;
1271 RedundantDefaultArg = true;
1272 PreviousDefaultArgLoc = NewDefaultLoc;
1273 } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument()) {
1274 // Merge the default argument from the old declaration to the
1275 // new declaration.
1276 SawDefaultArgument = true;
1277 // FIXME: We need to create a new kind of "default argument"
Douglas Gregor61c4d282011-01-05 15:48:55 +00001278 // expression that points to a previous non-type template
Douglas Gregord684b002009-02-10 19:49:53 +00001279 // parameter.
1280 NewNonTypeParm->setDefaultArgument(
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001281 OldNonTypeParm->getDefaultArgument(),
1282 /*Inherited=*/ true);
Douglas Gregord684b002009-02-10 19:49:53 +00001283 PreviousDefaultArgLoc = OldNonTypeParm->getDefaultArgumentLoc();
1284 } else if (NewNonTypeParm->hasDefaultArgument()) {
1285 SawDefaultArgument = true;
1286 PreviousDefaultArgLoc = NewNonTypeParm->getDefaultArgumentLoc();
1287 } else if (SawDefaultArgument)
Mike Stump1eb44332009-09-09 15:08:12 +00001288 MissingDefaultArg = true;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00001289 } else {
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001290 // Check the presence of a default argument here.
Douglas Gregord684b002009-02-10 19:49:53 +00001291 TemplateTemplateParmDecl *NewTemplateParm
1292 = cast<TemplateTemplateParmDecl>(*NewParam);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001293
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001294 // Check for unexpanded parameter packs, recursively.
1295 if (DiagnoseUnexpandedParameterPacks(*this, NewTemplateParm)) {
1296 Invalid = true;
1297 continue;
1298 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001299
1300 if (NewTemplateParm->hasDefaultArgument() &&
1301 DiagnoseDefaultTemplateArgument(*this, TPC,
1302 NewTemplateParm->getLocation(),
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001303 NewTemplateParm->getDefaultArgument().getSourceRange()))
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001304 NewTemplateParm->removeDefaultArgument();
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001305
1306 // Merge default arguments for template template parameters
Douglas Gregord684b002009-02-10 19:49:53 +00001307 TemplateTemplateParmDecl *OldTemplateParm
1308 = OldParams? cast<TemplateTemplateParmDecl>(*OldParam) : 0;
Douglas Gregor1ed64762011-01-05 16:19:19 +00001309 if (NewTemplateParm->isParameterPack()) {
1310 assert(!NewTemplateParm->hasDefaultArgument() &&
1311 "Parameter packs can't have a default argument!");
1312 SawParameterPack = true;
1313 ParameterPackLoc = NewTemplateParm->getLocation();
1314 } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument() &&
Douglas Gregord684b002009-02-10 19:49:53 +00001315 NewTemplateParm->hasDefaultArgument()) {
Douglas Gregor788cd062009-11-11 01:00:40 +00001316 OldDefaultLoc = OldTemplateParm->getDefaultArgument().getLocation();
1317 NewDefaultLoc = NewTemplateParm->getDefaultArgument().getLocation();
Douglas Gregord684b002009-02-10 19:49:53 +00001318 SawDefaultArgument = true;
1319 RedundantDefaultArg = true;
1320 PreviousDefaultArgLoc = NewDefaultLoc;
1321 } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument()) {
1322 // Merge the default argument from the old declaration to the
1323 // new declaration.
1324 SawDefaultArgument = true;
Mike Stump390b4cc2009-05-16 07:39:55 +00001325 // FIXME: We need to create a new kind of "default argument" expression
1326 // that points to a previous template template parameter.
Douglas Gregord684b002009-02-10 19:49:53 +00001327 NewTemplateParm->setDefaultArgument(
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001328 OldTemplateParm->getDefaultArgument(),
1329 /*Inherited=*/ true);
Douglas Gregor788cd062009-11-11 01:00:40 +00001330 PreviousDefaultArgLoc
1331 = OldTemplateParm->getDefaultArgument().getLocation();
Douglas Gregord684b002009-02-10 19:49:53 +00001332 } else if (NewTemplateParm->hasDefaultArgument()) {
1333 SawDefaultArgument = true;
Douglas Gregor788cd062009-11-11 01:00:40 +00001334 PreviousDefaultArgLoc
1335 = NewTemplateParm->getDefaultArgument().getLocation();
Douglas Gregord684b002009-02-10 19:49:53 +00001336 } else if (SawDefaultArgument)
Mike Stump1eb44332009-09-09 15:08:12 +00001337 MissingDefaultArg = true;
Douglas Gregord684b002009-02-10 19:49:53 +00001338 }
1339
1340 if (RedundantDefaultArg) {
1341 // C++ [temp.param]p12:
1342 // A template-parameter shall not be given default arguments
1343 // by two different declarations in the same scope.
1344 Diag(NewDefaultLoc, diag::err_template_param_default_arg_redefinition);
1345 Diag(OldDefaultLoc, diag::note_template_param_prev_default_arg);
1346 Invalid = true;
Douglas Gregoree5d21f2011-02-04 03:57:22 +00001347 } else if (MissingDefaultArg && TPC != TPC_FunctionTemplate) {
Douglas Gregord684b002009-02-10 19:49:53 +00001348 // C++ [temp.param]p11:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001349 // If a template-parameter of a class template has a default
1350 // template-argument, each subsequent template-parameter shall either
Douglas Gregorb49e4152011-01-05 16:21:17 +00001351 // have a default template-argument supplied or be a template parameter
1352 // pack.
Mike Stump1eb44332009-09-09 15:08:12 +00001353 Diag((*NewParam)->getLocation(),
Douglas Gregord684b002009-02-10 19:49:53 +00001354 diag::err_template_param_default_arg_missing);
1355 Diag(PreviousDefaultArgLoc, diag::note_template_param_prev_default_arg);
1356 Invalid = true;
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001357 RemoveDefaultArguments = true;
Douglas Gregord684b002009-02-10 19:49:53 +00001358 }
1359
1360 // If we have an old template parameter list that we're merging
1361 // in, move on to the next parameter.
1362 if (OldParams)
1363 ++OldParam;
1364 }
1365
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001366 // We were missing some default arguments at the end of the list, so remove
1367 // all of the default arguments.
1368 if (RemoveDefaultArguments) {
1369 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
1370 NewParamEnd = NewParams->end();
1371 NewParam != NewParamEnd; ++NewParam) {
1372 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*NewParam))
1373 TTP->removeDefaultArgument();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001374 else if (NonTypeTemplateParmDecl *NTTP
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001375 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam))
1376 NTTP->removeDefaultArgument();
1377 else
1378 cast<TemplateTemplateParmDecl>(*NewParam)->removeDefaultArgument();
1379 }
1380 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001381
Douglas Gregord684b002009-02-10 19:49:53 +00001382 return Invalid;
1383}
Douglas Gregorc15cb382009-02-09 23:23:08 +00001384
John McCall4e2cbb22010-10-20 05:44:58 +00001385namespace {
1386
1387/// A class which looks for a use of a certain level of template
1388/// parameter.
1389struct DependencyChecker : RecursiveASTVisitor<DependencyChecker> {
1390 typedef RecursiveASTVisitor<DependencyChecker> super;
1391
1392 unsigned Depth;
1393 bool Match;
1394
1395 DependencyChecker(TemplateParameterList *Params) : Match(false) {
1396 NamedDecl *ND = Params->getParam(0);
1397 if (TemplateTypeParmDecl *PD = dyn_cast<TemplateTypeParmDecl>(ND)) {
1398 Depth = PD->getDepth();
1399 } else if (NonTypeTemplateParmDecl *PD =
1400 dyn_cast<NonTypeTemplateParmDecl>(ND)) {
1401 Depth = PD->getDepth();
1402 } else {
1403 Depth = cast<TemplateTemplateParmDecl>(ND)->getDepth();
1404 }
1405 }
1406
1407 bool Matches(unsigned ParmDepth) {
1408 if (ParmDepth >= Depth) {
1409 Match = true;
1410 return true;
1411 }
1412 return false;
1413 }
1414
1415 bool VisitTemplateTypeParmType(const TemplateTypeParmType *T) {
1416 return !Matches(T->getDepth());
1417 }
1418
1419 bool TraverseTemplateName(TemplateName N) {
1420 if (TemplateTemplateParmDecl *PD =
1421 dyn_cast_or_null<TemplateTemplateParmDecl>(N.getAsTemplateDecl()))
1422 if (Matches(PD->getDepth())) return false;
1423 return super::TraverseTemplateName(N);
1424 }
1425
1426 bool VisitDeclRefExpr(DeclRefExpr *E) {
1427 if (NonTypeTemplateParmDecl *PD =
1428 dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) {
1429 if (PD->getDepth() == Depth) {
1430 Match = true;
1431 return false;
1432 }
1433 }
1434 return super::VisitDeclRefExpr(E);
1435 }
Douglas Gregor18c83392011-05-13 00:34:01 +00001436
1437 bool TraverseInjectedClassNameType(const InjectedClassNameType *T) {
1438 return TraverseType(T->getInjectedSpecializationType());
1439 }
John McCall4e2cbb22010-10-20 05:44:58 +00001440};
1441}
1442
Douglas Gregorc8406492011-05-10 18:27:06 +00001443/// Determines whether a given type depends on the given parameter
John McCall4e2cbb22010-10-20 05:44:58 +00001444/// list.
1445static bool
Douglas Gregorc8406492011-05-10 18:27:06 +00001446DependsOnTemplateParameters(QualType T, TemplateParameterList *Params) {
John McCall4e2cbb22010-10-20 05:44:58 +00001447 DependencyChecker Checker(Params);
Douglas Gregorc8406492011-05-10 18:27:06 +00001448 Checker.TraverseType(T);
John McCall4e2cbb22010-10-20 05:44:58 +00001449 return Checker.Match;
1450}
1451
Douglas Gregorc8406492011-05-10 18:27:06 +00001452// Find the source range corresponding to the named type in the given
1453// nested-name-specifier, if any.
1454static SourceRange getRangeOfTypeInNestedNameSpecifier(ASTContext &Context,
1455 QualType T,
1456 const CXXScopeSpec &SS) {
1457 NestedNameSpecifierLoc NNSLoc(SS.getScopeRep(), SS.location_data());
1458 while (NestedNameSpecifier *NNS = NNSLoc.getNestedNameSpecifier()) {
1459 if (const Type *CurType = NNS->getAsType()) {
1460 if (Context.hasSameUnqualifiedType(T, QualType(CurType, 0)))
1461 return NNSLoc.getTypeLoc().getSourceRange();
1462 } else
1463 break;
1464
1465 NNSLoc = NNSLoc.getPrefix();
1466 }
1467
1468 return SourceRange();
1469}
1470
Mike Stump1eb44332009-09-09 15:08:12 +00001471/// \brief Match the given template parameter lists to the given scope
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001472/// specifier, returning the template parameter list that applies to the
1473/// name.
1474///
1475/// \param DeclStartLoc the start of the declaration that has a scope
1476/// specifier or a template parameter list.
Mike Stump1eb44332009-09-09 15:08:12 +00001477///
Douglas Gregorc8406492011-05-10 18:27:06 +00001478/// \param DeclLoc The location of the declaration itself.
1479///
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001480/// \param SS the scope specifier that will be matched to the given template
1481/// parameter lists. This scope specifier precedes a qualified name that is
1482/// being declared.
1483///
1484/// \param ParamLists the template parameter lists, from the outermost to the
1485/// innermost template parameter lists.
1486///
1487/// \param NumParamLists the number of template parameter lists in ParamLists.
1488///
John McCall77e8b112010-04-13 20:37:33 +00001489/// \param IsFriend Whether to apply the slightly different rules for
1490/// matching template parameters to scope specifiers in friend
1491/// declarations.
1492///
Douglas Gregor1fef4e62009-10-07 22:35:40 +00001493/// \param IsExplicitSpecialization will be set true if the entity being
1494/// declared is an explicit specialization, false otherwise.
1495///
Mike Stump1eb44332009-09-09 15:08:12 +00001496/// \returns the template parameter list, if any, that corresponds to the
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001497/// name that is preceded by the scope specifier @p SS. This template
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00001498/// parameter list may have template parameters (if we're declaring a
Mike Stump1eb44332009-09-09 15:08:12 +00001499/// template) or may have no template parameters (if we're declaring a
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00001500/// template specialization), or may be NULL (if what we're declaring isn't
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001501/// itself a template).
1502TemplateParameterList *
1503Sema::MatchTemplateParametersToScopeSpecifier(SourceLocation DeclStartLoc,
Douglas Gregorc8406492011-05-10 18:27:06 +00001504 SourceLocation DeclLoc,
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001505 const CXXScopeSpec &SS,
1506 TemplateParameterList **ParamLists,
Douglas Gregor1fef4e62009-10-07 22:35:40 +00001507 unsigned NumParamLists,
John McCall77e8b112010-04-13 20:37:33 +00001508 bool IsFriend,
Douglas Gregor0167f3c2010-07-14 23:14:12 +00001509 bool &IsExplicitSpecialization,
1510 bool &Invalid) {
Douglas Gregor1fef4e62009-10-07 22:35:40 +00001511 IsExplicitSpecialization = false;
Douglas Gregorc8406492011-05-10 18:27:06 +00001512 Invalid = false;
1513
1514 // The sequence of nested types to which we will match up the template
1515 // parameter lists. We first build this list by starting with the type named
1516 // by the nested-name-specifier and walking out until we run out of types.
1517 llvm::SmallVector<QualType, 4> NestedTypes;
1518 QualType T;
Douglas Gregor714c9922011-05-15 17:27:27 +00001519 if (SS.getScopeRep()) {
1520 if (CXXRecordDecl *Record
1521 = dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, true)))
1522 T = Context.getTypeDeclType(Record);
1523 else
1524 T = QualType(SS.getScopeRep()->getAsType(), 0);
1525 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001526
1527 // If we found an explicit specialization that prevents us from needing
1528 // 'template<>' headers, this will be set to the location of that
1529 // explicit specialization.
1530 SourceLocation ExplicitSpecLoc;
1531
1532 while (!T.isNull()) {
1533 NestedTypes.push_back(T);
1534
1535 // Retrieve the parent of a record type.
1536 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
1537 // If this type is an explicit specialization, we're done.
1538 if (ClassTemplateSpecializationDecl *Spec
1539 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
1540 if (!isa<ClassTemplatePartialSpecializationDecl>(Spec) &&
1541 Spec->getSpecializationKind() == TSK_ExplicitSpecialization) {
1542 ExplicitSpecLoc = Spec->getLocation();
1543 break;
Douglas Gregor3ebd7532009-11-23 12:11:45 +00001544 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001545 } else if (Record->getTemplateSpecializationKind()
1546 == TSK_ExplicitSpecialization) {
1547 ExplicitSpecLoc = Record->getLocation();
John McCall77e8b112010-04-13 20:37:33 +00001548 break;
1549 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001550
1551 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Record->getParent()))
1552 T = Context.getTypeDeclType(Parent);
1553 else
1554 T = QualType();
1555 continue;
1556 }
1557
1558 if (const TemplateSpecializationType *TST
1559 = T->getAs<TemplateSpecializationType>()) {
1560 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
1561 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Template->getDeclContext()))
1562 T = Context.getTypeDeclType(Parent);
1563 else
1564 T = QualType();
1565 continue;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001566 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001567 }
1568
1569 // Look one step prior in a dependent template specialization type.
1570 if (const DependentTemplateSpecializationType *DependentTST
1571 = T->getAs<DependentTemplateSpecializationType>()) {
1572 if (NestedNameSpecifier *NNS = DependentTST->getQualifier())
1573 T = QualType(NNS->getAsType(), 0);
1574 else
1575 T = QualType();
1576 continue;
1577 }
1578
1579 // Look one step prior in a dependent name type.
1580 if (const DependentNameType *DependentName = T->getAs<DependentNameType>()){
1581 if (NestedNameSpecifier *NNS = DependentName->getQualifier())
1582 T = QualType(NNS->getAsType(), 0);
1583 else
1584 T = QualType();
1585 continue;
1586 }
1587
1588 // Retrieve the parent of an enumeration type.
1589 if (const EnumType *EnumT = T->getAs<EnumType>()) {
1590 // FIXME: Forward-declared enums require a TSK_ExplicitSpecialization
1591 // check here.
1592 EnumDecl *Enum = EnumT->getDecl();
1593
1594 // Get to the parent type.
1595 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Enum->getParent()))
1596 T = Context.getTypeDeclType(Parent);
1597 else
1598 T = QualType();
1599 continue;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001600 }
Mike Stump1eb44332009-09-09 15:08:12 +00001601
Douglas Gregorc8406492011-05-10 18:27:06 +00001602 T = QualType();
1603 }
1604 // Reverse the nested types list, since we want to traverse from the outermost
1605 // to the innermost while checking template-parameter-lists.
1606 std::reverse(NestedTypes.begin(), NestedTypes.end());
Douglas Gregorb88e8882009-07-30 17:40:51 +00001607
Douglas Gregorc8406492011-05-10 18:27:06 +00001608 // C++0x [temp.expl.spec]p17:
1609 // A member or a member template may be nested within many
1610 // enclosing class templates. In an explicit specialization for
1611 // such a member, the member declaration shall be preceded by a
1612 // template<> for each enclosing class template that is
1613 // explicitly specialized.
Douglas Gregor89b9f102011-06-06 15:22:55 +00001614 bool SawNonEmptyTemplateParameterList = false;
Douglas Gregorc8406492011-05-10 18:27:06 +00001615 unsigned ParamIdx = 0;
1616 for (unsigned TypeIdx = 0, NumTypes = NestedTypes.size(); TypeIdx != NumTypes;
1617 ++TypeIdx) {
1618 T = NestedTypes[TypeIdx];
1619
1620 // Whether we expect a 'template<>' header.
1621 bool NeedEmptyTemplateHeader = false;
1622
1623 // Whether we expect a template header with parameters.
1624 bool NeedNonemptyTemplateHeader = false;
1625
1626 // For a dependent type, the set of template parameters that we
1627 // expect to see.
1628 TemplateParameterList *ExpectedTemplateParams = 0;
1629
Douglas Gregor175c5bb2011-05-11 23:26:17 +00001630 // C++0x [temp.expl.spec]p15:
1631 // A member or a member template may be nested within many enclosing
1632 // class templates. In an explicit specialization for such a member, the
1633 // member declaration shall be preceded by a template<> for each
1634 // enclosing class template that is explicitly specialized.
Douglas Gregorc8406492011-05-10 18:27:06 +00001635 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
1636 if (ClassTemplatePartialSpecializationDecl *Partial
1637 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) {
1638 ExpectedTemplateParams = Partial->getTemplateParameters();
1639 NeedNonemptyTemplateHeader = true;
1640 } else if (Record->isDependentType()) {
1641 if (Record->getDescribedClassTemplate()) {
John McCall31f17ec2010-04-27 00:57:59 +00001642 ExpectedTemplateParams = Record->getDescribedClassTemplate()
Douglas Gregorc8406492011-05-10 18:27:06 +00001643 ->getTemplateParameters();
1644 NeedNonemptyTemplateHeader = true;
1645 }
1646 } else if (ClassTemplateSpecializationDecl *Spec
1647 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
1648 // C++0x [temp.expl.spec]p4:
1649 // Members of an explicitly specialized class template are defined
1650 // in the same manner as members of normal classes, and not using
1651 // the template<> syntax.
1652 if (Spec->getSpecializationKind() != TSK_ExplicitSpecialization)
1653 NeedEmptyTemplateHeader = true;
1654 else
Douglas Gregor95ea4502011-06-01 22:37:07 +00001655 continue;
Douglas Gregorc8406492011-05-10 18:27:06 +00001656 } else if (Record->getTemplateSpecializationKind()) {
1657 if (Record->getTemplateSpecializationKind()
Douglas Gregor175c5bb2011-05-11 23:26:17 +00001658 != TSK_ExplicitSpecialization &&
1659 TypeIdx == NumTypes - 1)
1660 IsExplicitSpecialization = true;
1661
1662 continue;
Douglas Gregorc8406492011-05-10 18:27:06 +00001663 }
1664 } else if (const TemplateSpecializationType *TST
1665 = T->getAs<TemplateSpecializationType>()) {
1666 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
1667 ExpectedTemplateParams = Template->getTemplateParameters();
1668 NeedNonemptyTemplateHeader = true;
1669 }
1670 } else if (T->getAs<DependentTemplateSpecializationType>()) {
1671 // FIXME: We actually could/should check the template arguments here
1672 // against the corresponding template parameter list.
1673 NeedNonemptyTemplateHeader = false;
1674 }
1675
Douglas Gregor89b9f102011-06-06 15:22:55 +00001676 // C++ [temp.expl.spec]p16:
1677 // In an explicit specialization declaration for a member of a class
1678 // template or a member template that ap- pears in namespace scope, the
1679 // member template and some of its enclosing class templates may remain
1680 // unspecialized, except that the declaration shall not explicitly
1681 // specialize a class member template if its en- closing class templates
1682 // are not explicitly specialized as well.
1683 if (ParamIdx < NumParamLists) {
1684 if (ParamLists[ParamIdx]->size() == 0) {
1685 if (SawNonEmptyTemplateParameterList) {
1686 Diag(DeclLoc, diag::err_specialize_member_of_template)
1687 << ParamLists[ParamIdx]->getSourceRange();
1688 Invalid = true;
1689 IsExplicitSpecialization = false;
1690 return 0;
1691 }
1692 } else
1693 SawNonEmptyTemplateParameterList = true;
1694 }
1695
Douglas Gregorc8406492011-05-10 18:27:06 +00001696 if (NeedEmptyTemplateHeader) {
1697 // If we're on the last of the types, and we need a 'template<>' header
1698 // here, then it's an explicit specialization.
1699 if (TypeIdx == NumTypes - 1)
1700 IsExplicitSpecialization = true;
1701
1702 if (ParamIdx < NumParamLists) {
1703 if (ParamLists[ParamIdx]->size() > 0) {
1704 // The header has template parameters when it shouldn't. Complain.
1705 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
1706 diag::err_template_param_list_matches_nontemplate)
1707 << T
1708 << SourceRange(ParamLists[ParamIdx]->getLAngleLoc(),
1709 ParamLists[ParamIdx]->getRAngleLoc())
1710 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
1711 Invalid = true;
1712 return 0;
1713 }
1714
1715 // Consume this template header.
1716 ++ParamIdx;
1717 continue;
1718 }
1719
1720 if (!IsFriend) {
1721 // We don't have a template header, but we should.
1722 SourceLocation ExpectedTemplateLoc;
1723 if (NumParamLists > 0)
1724 ExpectedTemplateLoc = ParamLists[0]->getTemplateLoc();
1725 else
1726 ExpectedTemplateLoc = DeclStartLoc;
1727
1728 Diag(DeclLoc, diag::err_template_spec_needs_header)
1729 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS)
1730 << FixItHint::CreateInsertion(ExpectedTemplateLoc, "template<> ");
1731 }
1732
1733 continue;
1734 }
1735
1736 if (NeedNonemptyTemplateHeader) {
1737 // In friend declarations we can have template-ids which don't
1738 // depend on the corresponding template parameter lists. But
1739 // assume that empty parameter lists are supposed to match this
1740 // template-id.
1741 if (IsFriend && T->isDependentType()) {
1742 if (ParamIdx < NumParamLists &&
1743 DependsOnTemplateParameters(T, ParamLists[ParamIdx]))
1744 ExpectedTemplateParams = 0;
1745 else
1746 continue;
Mike Stump1eb44332009-09-09 15:08:12 +00001747 }
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001748
Douglas Gregorc8406492011-05-10 18:27:06 +00001749 if (ParamIdx < NumParamLists) {
1750 // Check the template parameter list, if we can.
1751 if (ExpectedTemplateParams &&
1752 !TemplateParameterListsAreEqual(ParamLists[ParamIdx],
1753 ExpectedTemplateParams,
1754 true, TPL_TemplateMatch))
1755 Invalid = true;
1756
1757 if (!Invalid &&
1758 CheckTemplateParameterList(ParamLists[ParamIdx], 0,
1759 TPC_ClassTemplateMember))
1760 Invalid = true;
1761
1762 ++ParamIdx;
1763 continue;
1764 }
1765
1766 Diag(DeclLoc, diag::err_template_spec_needs_template_parameters)
1767 << T
1768 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
1769 Invalid = true;
1770 continue;
1771 }
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001772 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001773
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001774 // If there were at least as many template-ids as there were template
1775 // parameter lists, then there are no template parameter lists remaining for
1776 // the declaration itself.
John McCall4e2cbb22010-10-20 05:44:58 +00001777 if (ParamIdx >= NumParamLists)
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001778 return 0;
Mike Stump1eb44332009-09-09 15:08:12 +00001779
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001780 // If there were too many template parameter lists, complain about that now.
Douglas Gregorc8406492011-05-10 18:27:06 +00001781 if (ParamIdx < NumParamLists - 1) {
1782 bool HasAnyExplicitSpecHeader = false;
1783 bool AllExplicitSpecHeaders = true;
1784 for (unsigned I = ParamIdx; I != NumParamLists - 1; ++I) {
1785 if (ParamLists[I]->size() == 0)
1786 HasAnyExplicitSpecHeader = true;
1787 else
1788 AllExplicitSpecHeaders = false;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001789 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001790
1791 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
1792 AllExplicitSpecHeaders? diag::warn_template_spec_extra_headers
1793 : diag::err_template_spec_extra_headers)
1794 << SourceRange(ParamLists[ParamIdx]->getTemplateLoc(),
1795 ParamLists[NumParamLists - 2]->getRAngleLoc());
1796
1797 // If there was a specialization somewhere, such that 'template<>' is
1798 // not required, and there were any 'template<>' headers, note where the
1799 // specialization occurred.
1800 if (ExplicitSpecLoc.isValid() && HasAnyExplicitSpecHeader)
1801 Diag(ExplicitSpecLoc,
1802 diag::note_explicit_template_spec_does_not_need_header)
1803 << NestedTypes.back();
1804
1805 // We have a template parameter list with no corresponding scope, which
1806 // means that the resulting template declaration can't be instantiated
1807 // properly (we'll end up with dependent nodes when we shouldn't).
1808 if (!AllExplicitSpecHeaders)
1809 Invalid = true;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001810 }
Mike Stump1eb44332009-09-09 15:08:12 +00001811
Douglas Gregor89b9f102011-06-06 15:22:55 +00001812 // C++ [temp.expl.spec]p16:
1813 // In an explicit specialization declaration for a member of a class
1814 // template or a member template that ap- pears in namespace scope, the
1815 // member template and some of its enclosing class templates may remain
1816 // unspecialized, except that the declaration shall not explicitly
1817 // specialize a class member template if its en- closing class templates
1818 // are not explicitly specialized as well.
1819 if (ParamLists[NumParamLists - 1]->size() == 0 &&
1820 SawNonEmptyTemplateParameterList) {
1821 Diag(DeclLoc, diag::err_specialize_member_of_template)
1822 << ParamLists[ParamIdx]->getSourceRange();
1823 Invalid = true;
1824 IsExplicitSpecialization = false;
1825 return 0;
1826 }
1827
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001828 // Return the last template parameter list, which corresponds to the
1829 // entity being declared.
1830 return ParamLists[NumParamLists - 1];
1831}
1832
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001833void Sema::NoteAllFoundTemplates(TemplateName Name) {
1834 if (TemplateDecl *Template = Name.getAsTemplateDecl()) {
1835 Diag(Template->getLocation(), diag::note_template_declared_here)
1836 << (isa<FunctionTemplateDecl>(Template)? 0
1837 : isa<ClassTemplateDecl>(Template)? 1
Richard Smith3e4c6c42011-05-05 21:57:07 +00001838 : isa<TypeAliasTemplateDecl>(Template)? 2
1839 : 3)
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001840 << Template->getDeclName();
1841 return;
1842 }
1843
1844 if (OverloadedTemplateStorage *OST = Name.getAsOverloadedTemplate()) {
1845 for (OverloadedTemplateStorage::iterator I = OST->begin(),
1846 IEnd = OST->end();
1847 I != IEnd; ++I)
1848 Diag((*I)->getLocation(), diag::note_template_declared_here)
1849 << 0 << (*I)->getDeclName();
1850
1851 return;
1852 }
1853}
1854
1855
Douglas Gregor7532dc62009-03-30 22:58:21 +00001856QualType Sema::CheckTemplateIdType(TemplateName Name,
1857 SourceLocation TemplateLoc,
Douglas Gregor67714232011-03-03 02:41:12 +00001858 TemplateArgumentListInfo &TemplateArgs) {
Richard Smith3e4c6c42011-05-05 21:57:07 +00001859 DependentTemplateName *DTN = Name.getAsDependentTemplateName();
1860 if (DTN && DTN->isIdentifier())
1861 // When building a template-id where the template-name is dependent,
1862 // assume the template is a type template. Either our assumption is
1863 // correct, or the code is ill-formed and will be diagnosed when the
1864 // dependent name is substituted.
1865 return Context.getDependentTemplateSpecializationType(ETK_None,
1866 DTN->getQualifier(),
1867 DTN->getIdentifier(),
1868 TemplateArgs);
1869
Douglas Gregor7532dc62009-03-30 22:58:21 +00001870 TemplateDecl *Template = Name.getAsTemplateDecl();
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001871 if (!Template || isa<FunctionTemplateDecl>(Template)) {
1872 // We might have a substituted template template parameter pack. If so,
1873 // build a template specialization type for it.
1874 if (Name.getAsSubstTemplateTemplateParmPack())
1875 return Context.getTemplateSpecializationType(Name, TemplateArgs);
Richard Smith3e4c6c42011-05-05 21:57:07 +00001876
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001877 Diag(TemplateLoc, diag::err_template_id_not_a_type)
1878 << Name;
1879 NoteAllFoundTemplates(Name);
1880 return QualType();
Douglas Gregorc45c2322009-03-31 00:43:58 +00001881 }
Douglas Gregor7532dc62009-03-30 22:58:21 +00001882
Douglas Gregor40808ce2009-03-09 23:48:35 +00001883 // Check that the template argument list is well-formed for this
1884 // template.
Douglas Gregor910f8002010-11-07 23:05:16 +00001885 llvm::SmallVector<TemplateArgument, 4> Converted;
John McCalld5532b62009-11-23 01:53:49 +00001886 if (CheckTemplateArgumentList(Template, TemplateLoc, TemplateArgs,
Douglas Gregor16134c62009-07-01 00:28:38 +00001887 false, Converted))
Douglas Gregor40808ce2009-03-09 23:48:35 +00001888 return QualType();
1889
Douglas Gregor910f8002010-11-07 23:05:16 +00001890 assert((Converted.size() == Template->getTemplateParameters()->size()) &&
Douglas Gregor40808ce2009-03-09 23:48:35 +00001891 "Converted template argument list is too short!");
1892
1893 QualType CanonType;
1894
Richard Smith3e4c6c42011-05-05 21:57:07 +00001895 if (TypeAliasTemplateDecl *AliasTemplate
1896 = dyn_cast<TypeAliasTemplateDecl>(Template)) {
1897 // Find the canonical type for this type alias template specialization.
1898 TypeAliasDecl *Pattern = AliasTemplate->getTemplatedDecl();
1899 if (Pattern->isInvalidDecl())
1900 return QualType();
1901
1902 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
1903 Converted.data(), Converted.size());
1904
1905 // Only substitute for the innermost template argument list.
1906 MultiLevelTemplateArgumentList TemplateArgLists;
Richard Smith18041742011-05-14 15:04:18 +00001907 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
Richard Smithaff37b42011-05-12 00:06:17 +00001908 unsigned Depth = AliasTemplate->getTemplateParameters()->getDepth();
1909 for (unsigned I = 0; I < Depth; ++I)
1910 TemplateArgLists.addOuterTemplateArguments(0, 0);
Richard Smith3e4c6c42011-05-05 21:57:07 +00001911
1912 InstantiatingTemplate Inst(*this, TemplateLoc, Template);
1913 CanonType = SubstType(Pattern->getUnderlyingType(),
1914 TemplateArgLists, AliasTemplate->getLocation(),
1915 AliasTemplate->getDeclName());
1916 if (CanonType.isNull())
1917 return QualType();
1918 } else if (Name.isDependent() ||
1919 TemplateSpecializationType::anyDependentTemplateArguments(
1920 TemplateArgs)) {
Douglas Gregor40808ce2009-03-09 23:48:35 +00001921 // This class template specialization is a dependent
1922 // type. Therefore, its canonical type is another class template
1923 // specialization type that contains all of the converted
1924 // arguments in canonical form. This ensures that, e.g., A<T> and
1925 // A<T, T> have identical types when A is declared as:
1926 //
1927 // template<typename T, typename U = T> struct A;
Douglas Gregor25a3ef72009-05-07 06:41:52 +00001928 TemplateName CanonName = Context.getCanonicalTemplateName(Name);
Mike Stump1eb44332009-09-09 15:08:12 +00001929 CanonType = Context.getTemplateSpecializationType(CanonName,
Douglas Gregor910f8002010-11-07 23:05:16 +00001930 Converted.data(),
1931 Converted.size());
Mike Stump1eb44332009-09-09 15:08:12 +00001932
Douglas Gregor1275ae02009-07-28 23:00:59 +00001933 // FIXME: CanonType is not actually the canonical type, and unfortunately
John McCall833ca992009-10-29 08:12:44 +00001934 // it is a TemplateSpecializationType that we will never use again.
Douglas Gregor1275ae02009-07-28 23:00:59 +00001935 // In the future, we need to teach getTemplateSpecializationType to only
1936 // build the canonical type and return that to us.
1937 CanonType = Context.getCanonicalType(CanonType);
John McCall31f17ec2010-04-27 00:57:59 +00001938
1939 // This might work out to be a current instantiation, in which
1940 // case the canonical type needs to be the InjectedClassNameType.
1941 //
1942 // TODO: in theory this could be a simple hashtable lookup; most
1943 // changes to CurContext don't change the set of current
1944 // instantiations.
1945 if (isa<ClassTemplateDecl>(Template)) {
1946 for (DeclContext *Ctx = CurContext; Ctx; Ctx = Ctx->getLookupParent()) {
1947 // If we get out to a namespace, we're done.
1948 if (Ctx->isFileContext()) break;
1949
1950 // If this isn't a record, keep looking.
1951 CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx);
1952 if (!Record) continue;
1953
1954 // Look for one of the two cases with InjectedClassNameTypes
1955 // and check whether it's the same template.
1956 if (!isa<ClassTemplatePartialSpecializationDecl>(Record) &&
1957 !Record->getDescribedClassTemplate())
1958 continue;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001959
John McCall31f17ec2010-04-27 00:57:59 +00001960 // Fetch the injected class name type and check whether its
1961 // injected type is equal to the type we just built.
1962 QualType ICNT = Context.getTypeDeclType(Record);
1963 QualType Injected = cast<InjectedClassNameType>(ICNT)
1964 ->getInjectedSpecializationType();
1965
1966 if (CanonType != Injected->getCanonicalTypeInternal())
1967 continue;
1968
1969 // If so, the canonical type of this TST is the injected
1970 // class name type of the record we just found.
1971 assert(ICNT.isCanonical());
1972 CanonType = ICNT;
John McCall31f17ec2010-04-27 00:57:59 +00001973 break;
1974 }
1975 }
Mike Stump1eb44332009-09-09 15:08:12 +00001976 } else if (ClassTemplateDecl *ClassTemplate
Douglas Gregor7532dc62009-03-30 22:58:21 +00001977 = dyn_cast<ClassTemplateDecl>(Template)) {
Douglas Gregor40808ce2009-03-09 23:48:35 +00001978 // Find the class template specialization declaration that
1979 // corresponds to these arguments.
Douglas Gregor40808ce2009-03-09 23:48:35 +00001980 void *InsertPos = 0;
1981 ClassTemplateSpecializationDecl *Decl
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001982 = ClassTemplate->findSpecialization(Converted.data(), Converted.size(),
Douglas Gregor910f8002010-11-07 23:05:16 +00001983 InsertPos);
Douglas Gregor40808ce2009-03-09 23:48:35 +00001984 if (!Decl) {
1985 // This is the first time we have referenced this class template
1986 // specialization. Create the canonical declaration and add it to
1987 // the set of specializations.
Mike Stump1eb44332009-09-09 15:08:12 +00001988 Decl = ClassTemplateSpecializationDecl::Create(Context,
Douglas Gregor13c85772010-05-06 00:28:52 +00001989 ClassTemplate->getTemplatedDecl()->getTagKind(),
1990 ClassTemplate->getDeclContext(),
1991 ClassTemplate->getLocation(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00001992 ClassTemplate->getLocation(),
Douglas Gregor910f8002010-11-07 23:05:16 +00001993 ClassTemplate,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001994 Converted.data(),
Douglas Gregor910f8002010-11-07 23:05:16 +00001995 Converted.size(), 0);
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00001996 ClassTemplate->AddSpecialization(Decl, InsertPos);
Douglas Gregor40808ce2009-03-09 23:48:35 +00001997 Decl->setLexicalDeclContext(CurContext);
1998 }
1999
2000 CanonType = Context.getTypeDeclType(Decl);
John McCall3cb0ebd2010-03-10 03:28:59 +00002001 assert(isa<RecordType>(CanonType) &&
2002 "type of non-dependent specialization is not a RecordType");
Douglas Gregor40808ce2009-03-09 23:48:35 +00002003 }
Mike Stump1eb44332009-09-09 15:08:12 +00002004
Douglas Gregor40808ce2009-03-09 23:48:35 +00002005 // Build the fully-sugared type for this class template
2006 // specialization, which refers back to the class template
2007 // specialization we created or found.
John McCall71d74bc2010-06-13 09:25:03 +00002008 return Context.getTemplateSpecializationType(Name, TemplateArgs, CanonType);
Douglas Gregor40808ce2009-03-09 23:48:35 +00002009}
2010
John McCallf312b1e2010-08-26 23:41:50 +00002011TypeResult
Douglas Gregor059101f2011-03-02 00:47:37 +00002012Sema::ActOnTemplateIdType(CXXScopeSpec &SS,
2013 TemplateTy TemplateD, SourceLocation TemplateLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00002014 SourceLocation LAngleLoc,
Douglas Gregor7532dc62009-03-30 22:58:21 +00002015 ASTTemplateArgsPtr TemplateArgsIn,
John McCall6b2becf2009-09-08 17:47:29 +00002016 SourceLocation RAngleLoc) {
Douglas Gregor059101f2011-03-02 00:47:37 +00002017 if (SS.isInvalid())
2018 return true;
2019
Douglas Gregor7532dc62009-03-30 22:58:21 +00002020 TemplateName Template = TemplateD.getAsVal<TemplateName>();
Douglas Gregor55f6b142009-02-09 18:46:07 +00002021
Douglas Gregor40808ce2009-03-09 23:48:35 +00002022 // Translate the parser's template argument list in our AST format.
John McCalld5532b62009-11-23 01:53:49 +00002023 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
Douglas Gregor314b97f2009-11-10 19:49:08 +00002024 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
Douglas Gregorc15cb382009-02-09 23:23:08 +00002025
Douglas Gregora88f09f2011-02-28 17:23:35 +00002026 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
2027 QualType T = Context.getDependentTemplateSpecializationType(ETK_None,
2028 DTN->getQualifier(),
2029 DTN->getIdentifier(),
2030 TemplateArgs);
2031
2032 // Build type-source information.
2033 TypeLocBuilder TLB;
2034 DependentTemplateSpecializationTypeLoc SpecTL
2035 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
Douglas Gregor059101f2011-03-02 00:47:37 +00002036 SpecTL.setKeywordLoc(SourceLocation());
Douglas Gregora88f09f2011-02-28 17:23:35 +00002037 SpecTL.setNameLoc(TemplateLoc);
2038 SpecTL.setLAngleLoc(LAngleLoc);
2039 SpecTL.setRAngleLoc(RAngleLoc);
Douglas Gregor94fdffa2011-03-01 20:11:18 +00002040 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
Douglas Gregora88f09f2011-02-28 17:23:35 +00002041 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
2042 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
2043 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
2044 }
2045
John McCalld5532b62009-11-23 01:53:49 +00002046 QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs);
Douglas Gregor40808ce2009-03-09 23:48:35 +00002047 TemplateArgsIn.release();
Douglas Gregor31a19b62009-04-01 21:51:26 +00002048
2049 if (Result.isNull())
2050 return true;
2051
Douglas Gregor059101f2011-03-02 00:47:37 +00002052 // Build type-source information.
2053 TypeLocBuilder TLB;
2054 TemplateSpecializationTypeLoc SpecTL
2055 = TLB.push<TemplateSpecializationTypeLoc>(Result);
2056 SpecTL.setTemplateNameLoc(TemplateLoc);
2057 SpecTL.setLAngleLoc(LAngleLoc);
2058 SpecTL.setRAngleLoc(RAngleLoc);
2059 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
2060 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
John McCall833ca992009-10-29 08:12:44 +00002061
Douglas Gregor059101f2011-03-02 00:47:37 +00002062 if (SS.isNotEmpty()) {
2063 // Create an elaborated-type-specifier containing the nested-name-specifier.
2064 Result = Context.getElaboratedType(ETK_None, SS.getScopeRep(), Result);
2065 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
2066 ElabTL.setKeywordLoc(SourceLocation());
2067 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
2068 }
2069
2070 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
John McCall6b2becf2009-09-08 17:47:29 +00002071}
John McCallf1bbbb42009-09-04 01:14:41 +00002072
Douglas Gregor059101f2011-03-02 00:47:37 +00002073TypeResult Sema::ActOnTagTemplateIdType(TagUseKind TUK,
John McCallf312b1e2010-08-26 23:41:50 +00002074 TypeSpecifierType TagSpec,
Douglas Gregor059101f2011-03-02 00:47:37 +00002075 SourceLocation TagLoc,
2076 CXXScopeSpec &SS,
2077 TemplateTy TemplateD,
2078 SourceLocation TemplateLoc,
2079 SourceLocation LAngleLoc,
2080 ASTTemplateArgsPtr TemplateArgsIn,
2081 SourceLocation RAngleLoc) {
2082 TemplateName Template = TemplateD.getAsVal<TemplateName>();
2083
2084 // Translate the parser's template argument list in our AST format.
2085 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
2086 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
2087
2088 // Determine the tag kind
Abramo Bagnara465d41b2010-05-11 21:36:43 +00002089 TagTypeKind TagKind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
Douglas Gregor059101f2011-03-02 00:47:37 +00002090 ElaboratedTypeKeyword Keyword
2091 = TypeWithKeyword::getKeywordForTagTypeKind(TagKind);
Mike Stump1eb44332009-09-09 15:08:12 +00002092
Douglas Gregor059101f2011-03-02 00:47:37 +00002093 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
2094 QualType T = Context.getDependentTemplateSpecializationType(Keyword,
2095 DTN->getQualifier(),
2096 DTN->getIdentifier(),
2097 TemplateArgs);
2098
2099 // Build type-source information.
2100 TypeLocBuilder TLB;
2101 DependentTemplateSpecializationTypeLoc SpecTL
2102 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
2103 SpecTL.setKeywordLoc(TagLoc);
2104 SpecTL.setNameLoc(TemplateLoc);
2105 SpecTL.setLAngleLoc(LAngleLoc);
2106 SpecTL.setRAngleLoc(RAngleLoc);
2107 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
2108 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
2109 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
2110 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
2111 }
Richard Smith3e4c6c42011-05-05 21:57:07 +00002112
2113 if (TypeAliasTemplateDecl *TAT =
2114 dyn_cast_or_null<TypeAliasTemplateDecl>(Template.getAsTemplateDecl())) {
2115 // C++0x [dcl.type.elab]p2:
2116 // If the identifier resolves to a typedef-name or the simple-template-id
2117 // resolves to an alias template specialization, the
2118 // elaborated-type-specifier is ill-formed.
2119 Diag(TemplateLoc, diag::err_tag_reference_non_tag) << 4;
2120 Diag(TAT->getLocation(), diag::note_declared_at);
2121 }
Douglas Gregor059101f2011-03-02 00:47:37 +00002122
2123 QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs);
2124 if (Result.isNull())
2125 return TypeResult();
2126
2127 // Check the tag kind
2128 if (const RecordType *RT = Result->getAs<RecordType>()) {
John McCall6b2becf2009-09-08 17:47:29 +00002129 RecordDecl *D = RT->getDecl();
Douglas Gregor059101f2011-03-02 00:47:37 +00002130
John McCall6b2becf2009-09-08 17:47:29 +00002131 IdentifierInfo *Id = D->getIdentifier();
2132 assert(Id && "templated class must have an identifier");
Douglas Gregor059101f2011-03-02 00:47:37 +00002133
Richard Trieubbf34c02011-06-10 03:11:26 +00002134 if (!isAcceptableTagRedeclaration(D, TagKind, TUK == TUK_Definition,
2135 TagLoc, *Id)) {
John McCall6b2becf2009-09-08 17:47:29 +00002136 Diag(TagLoc, diag::err_use_with_wrong_tag)
Douglas Gregor059101f2011-03-02 00:47:37 +00002137 << Result
Douglas Gregor849b2432010-03-31 17:46:05 +00002138 << FixItHint::CreateReplacement(SourceRange(TagLoc), D->getKindName());
John McCallc4e70192009-09-11 04:59:25 +00002139 Diag(D->getLocation(), diag::note_previous_use);
John McCallf1bbbb42009-09-04 01:14:41 +00002140 }
2141 }
Douglas Gregor059101f2011-03-02 00:47:37 +00002142
2143 // Provide source-location information for the template specialization.
2144 TypeLocBuilder TLB;
2145 TemplateSpecializationTypeLoc SpecTL
2146 = TLB.push<TemplateSpecializationTypeLoc>(Result);
2147 SpecTL.setTemplateNameLoc(TemplateLoc);
2148 SpecTL.setLAngleLoc(LAngleLoc);
2149 SpecTL.setRAngleLoc(RAngleLoc);
2150 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
2151 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
John McCallf1bbbb42009-09-04 01:14:41 +00002152
Douglas Gregor059101f2011-03-02 00:47:37 +00002153 // Construct an elaborated type containing the nested-name-specifier (if any)
2154 // and keyword.
2155 Result = Context.getElaboratedType(Keyword, SS.getScopeRep(), Result);
2156 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
2157 ElabTL.setKeywordLoc(TagLoc);
2158 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
2159 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
Douglas Gregor55f6b142009-02-09 18:46:07 +00002160}
2161
John McCall60d7b3a2010-08-24 06:29:42 +00002162ExprResult Sema::BuildTemplateIdExpr(const CXXScopeSpec &SS,
Douglas Gregor4c9be892011-02-28 20:01:57 +00002163 LookupResult &R,
2164 bool RequiresADL,
John McCalld5532b62009-11-23 01:53:49 +00002165 const TemplateArgumentListInfo &TemplateArgs) {
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002166 // FIXME: Can we do any checking at this point? I guess we could check the
2167 // template arguments that we have against the template name, if the template
Mike Stump1eb44332009-09-09 15:08:12 +00002168 // name refers to a single template. That's not a terribly common case,
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002169 // though.
Douglas Gregor1be8eec2011-02-19 21:32:49 +00002170 // foo<int> could identify a single function unambiguously
2171 // This approach does NOT work, since f<int>(1);
2172 // gets resolved prior to resorting to overload resolution
2173 // i.e., template<class T> void f(double);
2174 // vs template<class T, class U> void f(U);
John McCallf7a1a742009-11-24 19:00:30 +00002175
2176 // These should be filtered out by our callers.
2177 assert(!R.empty() && "empty lookup results when building templateid");
2178 assert(!R.isAmbiguous() && "ambiguous lookup when building templateid");
2179
John McCallc373d482010-01-27 01:50:18 +00002180 // We don't want lookup warnings at this point.
2181 R.suppressDiagnostics();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002182
John McCallf7a1a742009-11-24 19:00:30 +00002183 UnresolvedLookupExpr *ULE
Douglas Gregorbebbe0d2010-12-15 01:34:56 +00002184 = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
Douglas Gregor4c9be892011-02-28 20:01:57 +00002185 SS.getWithLocInContext(Context),
Abramo Bagnara25777432010-08-11 22:01:17 +00002186 R.getLookupNameInfo(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002187 RequiresADL, TemplateArgs,
Douglas Gregor5a84dec2010-05-23 18:57:34 +00002188 R.begin(), R.end());
John McCallf7a1a742009-11-24 19:00:30 +00002189
2190 return Owned(ULE);
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002191}
2192
John McCallf7a1a742009-11-24 19:00:30 +00002193// We actually only call this from template instantiation.
John McCall60d7b3a2010-08-24 06:29:42 +00002194ExprResult
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00002195Sema::BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00002196 const DeclarationNameInfo &NameInfo,
John McCallf7a1a742009-11-24 19:00:30 +00002197 const TemplateArgumentListInfo &TemplateArgs) {
2198 DeclContext *DC;
2199 if (!(DC = computeDeclContext(SS, false)) ||
2200 DC->isDependentContext() ||
John McCall77bb1aa2010-05-01 00:40:08 +00002201 RequireCompleteDeclContext(SS, DC))
Abramo Bagnara25777432010-08-11 22:01:17 +00002202 return BuildDependentDeclRefExpr(SS, NameInfo, &TemplateArgs);
Mike Stump1eb44332009-09-09 15:08:12 +00002203
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002204 bool MemberOfUnknownSpecialization;
Abramo Bagnara25777432010-08-11 22:01:17 +00002205 LookupResult R(*this, NameInfo, LookupOrdinaryName);
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002206 LookupTemplateName(R, (Scope*) 0, SS, QualType(), /*Entering*/ false,
2207 MemberOfUnknownSpecialization);
Mike Stump1eb44332009-09-09 15:08:12 +00002208
John McCallf7a1a742009-11-24 19:00:30 +00002209 if (R.isAmbiguous())
2210 return ExprError();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002211
John McCallf7a1a742009-11-24 19:00:30 +00002212 if (R.empty()) {
Abramo Bagnara25777432010-08-11 22:01:17 +00002213 Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_non_template)
2214 << NameInfo.getName() << SS.getRange();
John McCallf7a1a742009-11-24 19:00:30 +00002215 return ExprError();
2216 }
2217
2218 if (ClassTemplateDecl *Temp = R.getAsSingle<ClassTemplateDecl>()) {
Abramo Bagnara25777432010-08-11 22:01:17 +00002219 Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_class_template)
2220 << (NestedNameSpecifier*) SS.getScopeRep()
2221 << NameInfo.getName() << SS.getRange();
John McCallf7a1a742009-11-24 19:00:30 +00002222 Diag(Temp->getLocation(), diag::note_referenced_class_template);
2223 return ExprError();
2224 }
2225
2226 return BuildTemplateIdExpr(SS, R, /* ADL */ false, TemplateArgs);
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002227}
2228
Douglas Gregorc45c2322009-03-31 00:43:58 +00002229/// \brief Form a dependent template name.
2230///
2231/// This action forms a dependent template name given the template
2232/// name and its (presumably dependent) scope specifier. For
2233/// example, given "MetaFun::template apply", the scope specifier \p
2234/// SS will be "MetaFun::", \p TemplateKWLoc contains the location
2235/// of the "template" keyword, and "apply" is the \p Name.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002236TemplateNameKind Sema::ActOnDependentTemplateName(Scope *S,
Douglas Gregord6ab2322010-06-16 23:00:59 +00002237 SourceLocation TemplateKWLoc,
2238 CXXScopeSpec &SS,
2239 UnqualifiedId &Name,
John McCallb3d87482010-08-24 05:47:05 +00002240 ParsedType ObjectType,
Douglas Gregord6ab2322010-06-16 23:00:59 +00002241 bool EnteringContext,
2242 TemplateTy &Result) {
Douglas Gregor1a15dae2010-06-16 22:31:08 +00002243 if (TemplateKWLoc.isValid() && S && !S->getTemplateParamParent() &&
2244 !getLangOptions().CPlusPlus0x)
2245 Diag(TemplateKWLoc, diag::ext_template_outside_of_template)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002246 << FixItHint::CreateRemoval(TemplateKWLoc);
2247
Douglas Gregor0707bc52010-01-19 16:01:07 +00002248 DeclContext *LookupCtx = 0;
2249 if (SS.isSet())
2250 LookupCtx = computeDeclContext(SS, EnteringContext);
2251 if (!LookupCtx && ObjectType)
John McCallb3d87482010-08-24 05:47:05 +00002252 LookupCtx = computeDeclContext(ObjectType.get());
Douglas Gregor0707bc52010-01-19 16:01:07 +00002253 if (LookupCtx) {
Douglas Gregorc45c2322009-03-31 00:43:58 +00002254 // C++0x [temp.names]p5:
2255 // If a name prefixed by the keyword template is not the name of
2256 // a template, the program is ill-formed. [Note: the keyword
2257 // template may not be applied to non-template members of class
2258 // templates. -end note ] [ Note: as is the case with the
2259 // typename prefix, the template prefix is allowed in cases
2260 // where it is not strictly necessary; i.e., when the
2261 // nested-name-specifier or the expression on the left of the ->
2262 // or . is not dependent on a template-parameter, or the use
2263 // does not appear in the scope of a template. -end note]
2264 //
2265 // Note: C++03 was more strict here, because it banned the use of
2266 // the "template" keyword prior to a template-name that was not a
2267 // dependent name. C++ DR468 relaxed this requirement (the
2268 // "template" keyword is now permitted). We follow the C++0x
Douglas Gregor732281d2010-06-14 22:07:54 +00002269 // rules, even in C++03 mode with a warning, retroactively applying the DR.
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002270 bool MemberOfUnknownSpecialization;
Abramo Bagnara7c153532010-08-06 12:11:11 +00002271 TemplateNameKind TNK = isTemplateName(0, SS, TemplateKWLoc.isValid(), Name,
2272 ObjectType, EnteringContext, Result,
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002273 MemberOfUnknownSpecialization);
Douglas Gregor0707bc52010-01-19 16:01:07 +00002274 if (TNK == TNK_Non_template && LookupCtx->isDependentContext() &&
2275 isa<CXXRecordDecl>(LookupCtx) &&
Douglas Gregord078bd22011-03-11 23:27:41 +00002276 (!cast<CXXRecordDecl>(LookupCtx)->hasDefinition() ||
2277 cast<CXXRecordDecl>(LookupCtx)->hasAnyDependentBases())) {
Douglas Gregord6ab2322010-06-16 23:00:59 +00002278 // This is a dependent template. Handle it below.
Douglas Gregor9edad9b2010-01-14 17:47:39 +00002279 } else if (TNK == TNK_Non_template) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002280 Diag(Name.getSourceRange().getBegin(),
Douglas Gregor014e88d2009-11-03 23:16:33 +00002281 diag::err_template_kw_refers_to_non_template)
Abramo Bagnara25777432010-08-11 22:01:17 +00002282 << GetNameFromUnqualifiedId(Name).getName()
Douglas Gregor0278e122010-05-05 05:58:24 +00002283 << Name.getSourceRange()
2284 << TemplateKWLoc;
Douglas Gregord6ab2322010-06-16 23:00:59 +00002285 return TNK_Non_template;
Douglas Gregor9edad9b2010-01-14 17:47:39 +00002286 } else {
2287 // We found something; return it.
Douglas Gregord6ab2322010-06-16 23:00:59 +00002288 return TNK;
Douglas Gregorc45c2322009-03-31 00:43:58 +00002289 }
Douglas Gregorc45c2322009-03-31 00:43:58 +00002290 }
2291
Mike Stump1eb44332009-09-09 15:08:12 +00002292 NestedNameSpecifier *Qualifier
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002293 = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002294
Douglas Gregor014e88d2009-11-03 23:16:33 +00002295 switch (Name.getKind()) {
2296 case UnqualifiedId::IK_Identifier:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002297 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
Douglas Gregord6ab2322010-06-16 23:00:59 +00002298 Name.Identifier));
2299 return TNK_Dependent_template_name;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002300
Douglas Gregorca1bdd72009-11-04 00:56:37 +00002301 case UnqualifiedId::IK_OperatorFunctionId:
Douglas Gregord6ab2322010-06-16 23:00:59 +00002302 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
Douglas Gregorca1bdd72009-11-04 00:56:37 +00002303 Name.OperatorFunctionId.Operator));
Douglas Gregord6ab2322010-06-16 23:00:59 +00002304 return TNK_Dependent_template_name;
Sean Hunte6252d12009-11-28 08:58:14 +00002305
2306 case UnqualifiedId::IK_LiteralOperatorId:
2307 assert(false && "We don't support these; Parse shouldn't have allowed propagation");
2308
Douglas Gregor014e88d2009-11-03 23:16:33 +00002309 default:
2310 break;
2311 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002312
2313 Diag(Name.getSourceRange().getBegin(),
Douglas Gregor014e88d2009-11-03 23:16:33 +00002314 diag::err_template_kw_refers_to_non_template)
Abramo Bagnara25777432010-08-11 22:01:17 +00002315 << GetNameFromUnqualifiedId(Name).getName()
Douglas Gregor0278e122010-05-05 05:58:24 +00002316 << Name.getSourceRange()
2317 << TemplateKWLoc;
Douglas Gregord6ab2322010-06-16 23:00:59 +00002318 return TNK_Non_template;
Douglas Gregorc45c2322009-03-31 00:43:58 +00002319}
2320
Mike Stump1eb44332009-09-09 15:08:12 +00002321bool Sema::CheckTemplateTypeArgument(TemplateTypeParmDecl *Param,
John McCall833ca992009-10-29 08:12:44 +00002322 const TemplateArgumentLoc &AL,
Douglas Gregor910f8002010-11-07 23:05:16 +00002323 llvm::SmallVectorImpl<TemplateArgument> &Converted) {
John McCall833ca992009-10-29 08:12:44 +00002324 const TemplateArgument &Arg = AL.getArgument();
2325
Anders Carlsson436b1562009-06-13 00:33:33 +00002326 // Check template type parameter.
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002327 switch(Arg.getKind()) {
2328 case TemplateArgument::Type:
Anders Carlsson436b1562009-06-13 00:33:33 +00002329 // C++ [temp.arg.type]p1:
2330 // A template-argument for a template-parameter which is a
2331 // type shall be a type-id.
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002332 break;
2333 case TemplateArgument::Template: {
2334 // We have a template type parameter but the template argument
2335 // is a template without any arguments.
2336 SourceRange SR = AL.getSourceRange();
2337 TemplateName Name = Arg.getAsTemplate();
2338 Diag(SR.getBegin(), diag::err_template_missing_args)
2339 << Name << SR;
2340 if (TemplateDecl *Decl = Name.getAsTemplateDecl())
2341 Diag(Decl->getLocation(), diag::note_template_decl_here);
Anders Carlsson436b1562009-06-13 00:33:33 +00002342
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002343 return true;
2344 }
2345 default: {
Anders Carlsson436b1562009-06-13 00:33:33 +00002346 // We have a template type parameter but the template argument
2347 // is not a type.
John McCall828bff22009-10-29 18:45:58 +00002348 SourceRange SR = AL.getSourceRange();
2349 Diag(SR.getBegin(), diag::err_template_arg_must_be_type) << SR;
Anders Carlsson436b1562009-06-13 00:33:33 +00002350 Diag(Param->getLocation(), diag::note_template_param_here);
Mike Stump1eb44332009-09-09 15:08:12 +00002351
Anders Carlsson436b1562009-06-13 00:33:33 +00002352 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00002353 }
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002354 }
Anders Carlsson436b1562009-06-13 00:33:33 +00002355
John McCalla93c9342009-12-07 02:54:59 +00002356 if (CheckTemplateArgument(Param, AL.getTypeSourceInfo()))
Anders Carlsson436b1562009-06-13 00:33:33 +00002357 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00002358
Anders Carlsson436b1562009-06-13 00:33:33 +00002359 // Add the converted template type argument.
Douglas Gregor910f8002010-11-07 23:05:16 +00002360 Converted.push_back(
John McCall833ca992009-10-29 08:12:44 +00002361 TemplateArgument(Context.getCanonicalType(Arg.getAsType())));
Anders Carlsson436b1562009-06-13 00:33:33 +00002362 return false;
2363}
2364
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002365/// \brief Substitute template arguments into the default template argument for
2366/// the given template type parameter.
2367///
2368/// \param SemaRef the semantic analysis object for which we are performing
2369/// the substitution.
2370///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002371/// \param Template the template that we are synthesizing template arguments
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002372/// for.
2373///
2374/// \param TemplateLoc the location of the template name that started the
2375/// template-id we are checking.
2376///
2377/// \param RAngleLoc the location of the right angle bracket ('>') that
2378/// terminates the template-id.
2379///
2380/// \param Param the template template parameter whose default we are
2381/// substituting into.
2382///
2383/// \param Converted the list of template arguments provided for template
2384/// parameters that precede \p Param in the template parameter list.
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002385/// \returns the substituted template argument, or NULL if an error occurred.
John McCalla93c9342009-12-07 02:54:59 +00002386static TypeSourceInfo *
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002387SubstDefaultTemplateArgument(Sema &SemaRef,
2388 TemplateDecl *Template,
2389 SourceLocation TemplateLoc,
2390 SourceLocation RAngleLoc,
2391 TemplateTypeParmDecl *Param,
Douglas Gregor910f8002010-11-07 23:05:16 +00002392 llvm::SmallVectorImpl<TemplateArgument> &Converted) {
John McCalla93c9342009-12-07 02:54:59 +00002393 TypeSourceInfo *ArgType = Param->getDefaultArgumentInfo();
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002394
2395 // If the argument type is dependent, instantiate it now based
2396 // on the previously-computed template arguments.
2397 if (ArgType->getType()->isDependentType()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002398 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00002399 Converted.data(), Converted.size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002400
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002401 MultiLevelTemplateArgumentList AllTemplateArgs
2402 = SemaRef.getTemplateInstantiationArgs(Template, &TemplateArgs);
2403
2404 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
Douglas Gregor910f8002010-11-07 23:05:16 +00002405 Template, Converted.data(),
2406 Converted.size(),
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002407 SourceRange(TemplateLoc, RAngleLoc));
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002408
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002409 ArgType = SemaRef.SubstType(ArgType, AllTemplateArgs,
2410 Param->getDefaultArgumentLoc(),
2411 Param->getDeclName());
2412 }
2413
2414 return ArgType;
2415}
2416
2417/// \brief Substitute template arguments into the default template argument for
2418/// the given non-type template parameter.
2419///
2420/// \param SemaRef the semantic analysis object for which we are performing
2421/// the substitution.
2422///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002423/// \param Template the template that we are synthesizing template arguments
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002424/// for.
2425///
2426/// \param TemplateLoc the location of the template name that started the
2427/// template-id we are checking.
2428///
2429/// \param RAngleLoc the location of the right angle bracket ('>') that
2430/// terminates the template-id.
2431///
Douglas Gregor788cd062009-11-11 01:00:40 +00002432/// \param Param the non-type template parameter whose default we are
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002433/// substituting into.
2434///
2435/// \param Converted the list of template arguments provided for template
2436/// parameters that precede \p Param in the template parameter list.
2437///
2438/// \returns the substituted template argument, or NULL if an error occurred.
John McCall60d7b3a2010-08-24 06:29:42 +00002439static ExprResult
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002440SubstDefaultTemplateArgument(Sema &SemaRef,
2441 TemplateDecl *Template,
2442 SourceLocation TemplateLoc,
2443 SourceLocation RAngleLoc,
2444 NonTypeTemplateParmDecl *Param,
Douglas Gregor910f8002010-11-07 23:05:16 +00002445 llvm::SmallVectorImpl<TemplateArgument> &Converted) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002446 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00002447 Converted.data(), Converted.size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002448
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002449 MultiLevelTemplateArgumentList AllTemplateArgs
2450 = SemaRef.getTemplateInstantiationArgs(Template, &TemplateArgs);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002451
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002452 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
Douglas Gregor910f8002010-11-07 23:05:16 +00002453 Template, Converted.data(),
2454 Converted.size(),
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002455 SourceRange(TemplateLoc, RAngleLoc));
2456
2457 return SemaRef.SubstExpr(Param->getDefaultArgument(), AllTemplateArgs);
2458}
2459
Douglas Gregor788cd062009-11-11 01:00:40 +00002460/// \brief Substitute template arguments into the default template argument for
2461/// the given template template parameter.
2462///
2463/// \param SemaRef the semantic analysis object for which we are performing
2464/// the substitution.
2465///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002466/// \param Template the template that we are synthesizing template arguments
Douglas Gregor788cd062009-11-11 01:00:40 +00002467/// for.
2468///
2469/// \param TemplateLoc the location of the template name that started the
2470/// template-id we are checking.
2471///
2472/// \param RAngleLoc the location of the right angle bracket ('>') that
2473/// terminates the template-id.
2474///
2475/// \param Param the template template parameter whose default we are
2476/// substituting into.
2477///
2478/// \param Converted the list of template arguments provided for template
2479/// parameters that precede \p Param in the template parameter list.
2480///
Douglas Gregor1d752d72011-03-02 18:46:51 +00002481/// \param QualifierLoc Will be set to the nested-name-specifier (with
2482/// source-location information) that precedes the template name.
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002483///
Douglas Gregor788cd062009-11-11 01:00:40 +00002484/// \returns the substituted template argument, or NULL if an error occurred.
2485static TemplateName
2486SubstDefaultTemplateArgument(Sema &SemaRef,
2487 TemplateDecl *Template,
2488 SourceLocation TemplateLoc,
2489 SourceLocation RAngleLoc,
2490 TemplateTemplateParmDecl *Param,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002491 llvm::SmallVectorImpl<TemplateArgument> &Converted,
2492 NestedNameSpecifierLoc &QualifierLoc) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002493 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00002494 Converted.data(), Converted.size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002495
Douglas Gregor788cd062009-11-11 01:00:40 +00002496 MultiLevelTemplateArgumentList AllTemplateArgs
2497 = SemaRef.getTemplateInstantiationArgs(Template, &TemplateArgs);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002498
Douglas Gregor788cd062009-11-11 01:00:40 +00002499 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
Douglas Gregor910f8002010-11-07 23:05:16 +00002500 Template, Converted.data(),
2501 Converted.size(),
Douglas Gregor788cd062009-11-11 01:00:40 +00002502 SourceRange(TemplateLoc, RAngleLoc));
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002503
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002504 // Substitute into the nested-name-specifier first,
Douglas Gregor1d752d72011-03-02 18:46:51 +00002505 QualifierLoc = Param->getDefaultArgument().getTemplateQualifierLoc();
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002506 if (QualifierLoc) {
2507 QualifierLoc = SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc,
2508 AllTemplateArgs);
2509 if (!QualifierLoc)
2510 return TemplateName();
2511 }
2512
Douglas Gregor1d752d72011-03-02 18:46:51 +00002513 return SemaRef.SubstTemplateName(QualifierLoc,
Douglas Gregor788cd062009-11-11 01:00:40 +00002514 Param->getDefaultArgument().getArgument().getAsTemplate(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002515 Param->getDefaultArgument().getTemplateNameLoc(),
Douglas Gregor788cd062009-11-11 01:00:40 +00002516 AllTemplateArgs);
2517}
2518
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002519/// \brief If the given template parameter has a default template
2520/// argument, substitute into that default template argument and
2521/// return the corresponding template argument.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002522TemplateArgumentLoc
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002523Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
2524 SourceLocation TemplateLoc,
2525 SourceLocation RAngleLoc,
2526 Decl *Param,
Douglas Gregor910f8002010-11-07 23:05:16 +00002527 llvm::SmallVectorImpl<TemplateArgument> &Converted) {
2528 if (TemplateTypeParmDecl *TypeParm = dyn_cast<TemplateTypeParmDecl>(Param)) {
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002529 if (!TypeParm->hasDefaultArgument())
2530 return TemplateArgumentLoc();
2531
John McCalla93c9342009-12-07 02:54:59 +00002532 TypeSourceInfo *DI = SubstDefaultTemplateArgument(*this, Template,
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002533 TemplateLoc,
2534 RAngleLoc,
2535 TypeParm,
2536 Converted);
2537 if (DI)
2538 return TemplateArgumentLoc(TemplateArgument(DI->getType()), DI);
2539
2540 return TemplateArgumentLoc();
2541 }
2542
2543 if (NonTypeTemplateParmDecl *NonTypeParm
2544 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
2545 if (!NonTypeParm->hasDefaultArgument())
2546 return TemplateArgumentLoc();
2547
John McCall60d7b3a2010-08-24 06:29:42 +00002548 ExprResult Arg = SubstDefaultTemplateArgument(*this, Template,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002549 TemplateLoc,
2550 RAngleLoc,
2551 NonTypeParm,
2552 Converted);
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002553 if (Arg.isInvalid())
2554 return TemplateArgumentLoc();
2555
2556 Expr *ArgE = Arg.takeAs<Expr>();
2557 return TemplateArgumentLoc(TemplateArgument(ArgE), ArgE);
2558 }
2559
2560 TemplateTemplateParmDecl *TempTempParm
2561 = cast<TemplateTemplateParmDecl>(Param);
2562 if (!TempTempParm->hasDefaultArgument())
2563 return TemplateArgumentLoc();
2564
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002565
Douglas Gregor1d752d72011-03-02 18:46:51 +00002566 NestedNameSpecifierLoc QualifierLoc;
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002567 TemplateName TName = SubstDefaultTemplateArgument(*this, Template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002568 TemplateLoc,
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002569 RAngleLoc,
2570 TempTempParm,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002571 Converted,
2572 QualifierLoc);
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002573 if (TName.isNull())
2574 return TemplateArgumentLoc();
2575
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002576 return TemplateArgumentLoc(TemplateArgument(TName),
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002577 TempTempParm->getDefaultArgument().getTemplateQualifierLoc(),
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002578 TempTempParm->getDefaultArgument().getTemplateNameLoc());
2579}
2580
Douglas Gregore7526412009-11-11 19:31:23 +00002581/// \brief Check that the given template argument corresponds to the given
2582/// template parameter.
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002583///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002584/// \param Param The template parameter against which the argument will be
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002585/// checked.
2586///
2587/// \param Arg The template argument.
2588///
2589/// \param Template The template in which the template argument resides.
2590///
2591/// \param TemplateLoc The location of the template name for the template
2592/// whose argument list we're matching.
2593///
2594/// \param RAngleLoc The location of the right angle bracket ('>') that closes
2595/// the template argument list.
2596///
2597/// \param ArgumentPackIndex The index into the argument pack where this
2598/// argument will be placed. Only valid if the parameter is a parameter pack.
2599///
2600/// \param Converted The checked, converted argument will be added to the
2601/// end of this small vector.
2602///
2603/// \param CTAK Describes how we arrived at this particular template argument:
2604/// explicitly written, deduced, etc.
2605///
2606/// \returns true on error, false otherwise.
Douglas Gregore7526412009-11-11 19:31:23 +00002607bool Sema::CheckTemplateArgument(NamedDecl *Param,
2608 const TemplateArgumentLoc &Arg,
Douglas Gregor54c53cc2011-01-04 23:35:54 +00002609 NamedDecl *Template,
Douglas Gregore7526412009-11-11 19:31:23 +00002610 SourceLocation TemplateLoc,
Douglas Gregore7526412009-11-11 19:31:23 +00002611 SourceLocation RAngleLoc,
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002612 unsigned ArgumentPackIndex,
Douglas Gregor910f8002010-11-07 23:05:16 +00002613 llvm::SmallVectorImpl<TemplateArgument> &Converted,
Douglas Gregor02024a92010-03-28 02:42:43 +00002614 CheckTemplateArgumentKind CTAK) {
Douglas Gregord9e15302009-11-11 19:41:09 +00002615 // Check template type parameters.
2616 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param))
Douglas Gregore7526412009-11-11 19:31:23 +00002617 return CheckTemplateTypeArgument(TTP, Arg, Converted);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002618
Douglas Gregord9e15302009-11-11 19:41:09 +00002619 // Check non-type template parameters.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002620 if (NonTypeTemplateParmDecl *NTTP =dyn_cast<NonTypeTemplateParmDecl>(Param)) {
Douglas Gregore7526412009-11-11 19:31:23 +00002621 // Do substitution on the type of the non-type template parameter
Peter Collingbourne9f6f6a12010-12-10 17:08:53 +00002622 // with the template arguments we've seen thus far. But if the
2623 // template has a dependent context then we cannot substitute yet.
Douglas Gregore7526412009-11-11 19:31:23 +00002624 QualType NTTPType = NTTP->getType();
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002625 if (NTTP->isParameterPack() && NTTP->isExpandedParameterPack())
2626 NTTPType = NTTP->getExpansionType(ArgumentPackIndex);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002627
Peter Collingbourne9f6f6a12010-12-10 17:08:53 +00002628 if (NTTPType->isDependentType() &&
2629 !isa<TemplateTemplateParmDecl>(Template) &&
2630 !Template->getDeclContext()->isDependentContext()) {
Douglas Gregore7526412009-11-11 19:31:23 +00002631 // Do substitution on the type of the non-type template parameter.
2632 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
Douglas Gregor910f8002010-11-07 23:05:16 +00002633 NTTP, Converted.data(), Converted.size(),
Douglas Gregore7526412009-11-11 19:31:23 +00002634 SourceRange(TemplateLoc, RAngleLoc));
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002635
2636 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00002637 Converted.data(), Converted.size());
Douglas Gregore7526412009-11-11 19:31:23 +00002638 NTTPType = SubstType(NTTPType,
2639 MultiLevelTemplateArgumentList(TemplateArgs),
2640 NTTP->getLocation(),
2641 NTTP->getDeclName());
2642 // If that worked, check the non-type template parameter type
2643 // for validity.
2644 if (!NTTPType.isNull())
2645 NTTPType = CheckNonTypeTemplateParameterType(NTTPType,
2646 NTTP->getLocation());
2647 if (NTTPType.isNull())
2648 return true;
2649 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002650
Douglas Gregore7526412009-11-11 19:31:23 +00002651 switch (Arg.getArgument().getKind()) {
2652 case TemplateArgument::Null:
2653 assert(false && "Should never see a NULL template argument here");
2654 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002655
Douglas Gregore7526412009-11-11 19:31:23 +00002656 case TemplateArgument::Expression: {
Douglas Gregore7526412009-11-11 19:31:23 +00002657 TemplateArgument Result;
John Wiegley429bb272011-04-08 18:41:53 +00002658 ExprResult Res =
2659 CheckTemplateArgument(NTTP, NTTPType, Arg.getArgument().getAsExpr(),
2660 Result, CTAK);
2661 if (Res.isInvalid())
Douglas Gregore7526412009-11-11 19:31:23 +00002662 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002663
Douglas Gregor910f8002010-11-07 23:05:16 +00002664 Converted.push_back(Result);
Douglas Gregore7526412009-11-11 19:31:23 +00002665 break;
2666 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002667
Douglas Gregore7526412009-11-11 19:31:23 +00002668 case TemplateArgument::Declaration:
2669 case TemplateArgument::Integral:
2670 // We've already checked this template argument, so just copy
2671 // it to the list of converted arguments.
Douglas Gregor910f8002010-11-07 23:05:16 +00002672 Converted.push_back(Arg.getArgument());
Douglas Gregore7526412009-11-11 19:31:23 +00002673 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002674
Douglas Gregore7526412009-11-11 19:31:23 +00002675 case TemplateArgument::Template:
Douglas Gregora7fc9012011-01-05 18:58:31 +00002676 case TemplateArgument::TemplateExpansion:
Douglas Gregore7526412009-11-11 19:31:23 +00002677 // We were given a template template argument. It may not be ill-formed;
2678 // see below.
2679 if (DependentTemplateName *DTN
Douglas Gregora7fc9012011-01-05 18:58:31 +00002680 = Arg.getArgument().getAsTemplateOrTemplatePattern()
2681 .getAsDependentTemplateName()) {
Douglas Gregore7526412009-11-11 19:31:23 +00002682 // We have a template argument such as \c T::template X, which we
2683 // parsed as a template template argument. However, since we now
2684 // know that we need a non-type template argument, convert this
Abramo Bagnara25777432010-08-11 22:01:17 +00002685 // template name into an expression.
2686
2687 DeclarationNameInfo NameInfo(DTN->getIdentifier(),
2688 Arg.getTemplateNameLoc());
2689
Douglas Gregor00cf3cc2011-02-25 20:49:16 +00002690 CXXScopeSpec SS;
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002691 SS.Adopt(Arg.getTemplateQualifierLoc());
John Wiegley429bb272011-04-08 18:41:53 +00002692 ExprResult E = Owned(DependentScopeDeclRefExpr::Create(Context,
Douglas Gregor00cf3cc2011-02-25 20:49:16 +00002693 SS.getWithLocInContext(Context),
John Wiegley429bb272011-04-08 18:41:53 +00002694 NameInfo));
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002695
Douglas Gregora7fc9012011-01-05 18:58:31 +00002696 // If we parsed the template argument as a pack expansion, create a
2697 // pack expansion expression.
2698 if (Arg.getArgument().getKind() == TemplateArgument::TemplateExpansion){
John Wiegley429bb272011-04-08 18:41:53 +00002699 E = ActOnPackExpansion(E.take(), Arg.getTemplateEllipsisLoc());
2700 if (E.isInvalid())
Douglas Gregora7fc9012011-01-05 18:58:31 +00002701 return true;
Douglas Gregora7fc9012011-01-05 18:58:31 +00002702 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002703
Douglas Gregore7526412009-11-11 19:31:23 +00002704 TemplateArgument Result;
John Wiegley429bb272011-04-08 18:41:53 +00002705 E = CheckTemplateArgument(NTTP, NTTPType, E.take(), Result);
2706 if (E.isInvalid())
Douglas Gregore7526412009-11-11 19:31:23 +00002707 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002708
Douglas Gregor910f8002010-11-07 23:05:16 +00002709 Converted.push_back(Result);
Douglas Gregore7526412009-11-11 19:31:23 +00002710 break;
2711 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002712
Douglas Gregore7526412009-11-11 19:31:23 +00002713 // We have a template argument that actually does refer to a class
Richard Smith3e4c6c42011-05-05 21:57:07 +00002714 // template, alias template, or template template parameter, and
Douglas Gregore7526412009-11-11 19:31:23 +00002715 // therefore cannot be a non-type template argument.
2716 Diag(Arg.getLocation(), diag::err_template_arg_must_be_expr)
2717 << Arg.getSourceRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002718
Douglas Gregore7526412009-11-11 19:31:23 +00002719 Diag(Param->getLocation(), diag::note_template_param_here);
2720 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002721
Douglas Gregore7526412009-11-11 19:31:23 +00002722 case TemplateArgument::Type: {
2723 // We have a non-type template parameter but the template
2724 // argument is a type.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002725
Douglas Gregore7526412009-11-11 19:31:23 +00002726 // C++ [temp.arg]p2:
2727 // In a template-argument, an ambiguity between a type-id and
2728 // an expression is resolved to a type-id, regardless of the
2729 // form of the corresponding template-parameter.
2730 //
2731 // We warn specifically about this case, since it can be rather
2732 // confusing for users.
2733 QualType T = Arg.getArgument().getAsType();
2734 SourceRange SR = Arg.getSourceRange();
2735 if (T->isFunctionType())
2736 Diag(SR.getBegin(), diag::err_template_arg_nontype_ambig) << SR << T;
2737 else
2738 Diag(SR.getBegin(), diag::err_template_arg_must_be_expr) << SR;
2739 Diag(Param->getLocation(), diag::note_template_param_here);
2740 return true;
2741 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002742
Douglas Gregore7526412009-11-11 19:31:23 +00002743 case TemplateArgument::Pack:
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +00002744 llvm_unreachable("Caller must expand template argument packs");
Douglas Gregore7526412009-11-11 19:31:23 +00002745 break;
2746 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002747
Douglas Gregore7526412009-11-11 19:31:23 +00002748 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002749 }
2750
2751
Douglas Gregore7526412009-11-11 19:31:23 +00002752 // Check template template parameters.
2753 TemplateTemplateParmDecl *TempParm = cast<TemplateTemplateParmDecl>(Param);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002754
Douglas Gregore7526412009-11-11 19:31:23 +00002755 // Substitute into the template parameter list of the template
2756 // template parameter, since previously-supplied template arguments
2757 // may appear within the template template parameter.
2758 {
2759 // Set up a template instantiation context.
2760 LocalInstantiationScope Scope(*this);
2761 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
Douglas Gregor910f8002010-11-07 23:05:16 +00002762 TempParm, Converted.data(), Converted.size(),
Douglas Gregore7526412009-11-11 19:31:23 +00002763 SourceRange(TemplateLoc, RAngleLoc));
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002764
2765 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00002766 Converted.data(), Converted.size());
Douglas Gregore7526412009-11-11 19:31:23 +00002767 TempParm = cast_or_null<TemplateTemplateParmDecl>(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002768 SubstDecl(TempParm, CurContext,
Douglas Gregore7526412009-11-11 19:31:23 +00002769 MultiLevelTemplateArgumentList(TemplateArgs)));
2770 if (!TempParm)
2771 return true;
Douglas Gregore7526412009-11-11 19:31:23 +00002772 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002773
Douglas Gregore7526412009-11-11 19:31:23 +00002774 switch (Arg.getArgument().getKind()) {
2775 case TemplateArgument::Null:
2776 assert(false && "Should never see a NULL template argument here");
2777 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002778
Douglas Gregore7526412009-11-11 19:31:23 +00002779 case TemplateArgument::Template:
Douglas Gregora7fc9012011-01-05 18:58:31 +00002780 case TemplateArgument::TemplateExpansion:
Douglas Gregore7526412009-11-11 19:31:23 +00002781 if (CheckTemplateArgument(TempParm, Arg))
2782 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002783
Douglas Gregor910f8002010-11-07 23:05:16 +00002784 Converted.push_back(Arg.getArgument());
Douglas Gregore7526412009-11-11 19:31:23 +00002785 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002786
Douglas Gregore7526412009-11-11 19:31:23 +00002787 case TemplateArgument::Expression:
2788 case TemplateArgument::Type:
2789 // We have a template template parameter but the template
2790 // argument does not refer to a template.
Richard Smith3e4c6c42011-05-05 21:57:07 +00002791 Diag(Arg.getLocation(), diag::err_template_arg_must_be_template)
2792 << getLangOptions().CPlusPlus0x;
Douglas Gregore7526412009-11-11 19:31:23 +00002793 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002794
Douglas Gregore7526412009-11-11 19:31:23 +00002795 case TemplateArgument::Declaration:
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +00002796 llvm_unreachable(
Douglas Gregore7526412009-11-11 19:31:23 +00002797 "Declaration argument with template template parameter");
2798 break;
2799 case TemplateArgument::Integral:
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +00002800 llvm_unreachable(
Douglas Gregore7526412009-11-11 19:31:23 +00002801 "Integral argument with template template parameter");
2802 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002803
Douglas Gregore7526412009-11-11 19:31:23 +00002804 case TemplateArgument::Pack:
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +00002805 llvm_unreachable("Caller must expand template argument packs");
Douglas Gregore7526412009-11-11 19:31:23 +00002806 break;
2807 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002808
Douglas Gregore7526412009-11-11 19:31:23 +00002809 return false;
2810}
2811
Douglas Gregorc15cb382009-02-09 23:23:08 +00002812/// \brief Check that the given template argument list is well-formed
2813/// for specializing the given template.
2814bool Sema::CheckTemplateArgumentList(TemplateDecl *Template,
2815 SourceLocation TemplateLoc,
Douglas Gregor67714232011-03-03 02:41:12 +00002816 TemplateArgumentListInfo &TemplateArgs,
Douglas Gregor16134c62009-07-01 00:28:38 +00002817 bool PartialTemplateArgs,
Douglas Gregor910f8002010-11-07 23:05:16 +00002818 llvm::SmallVectorImpl<TemplateArgument> &Converted) {
Douglas Gregorc15cb382009-02-09 23:23:08 +00002819 TemplateParameterList *Params = Template->getTemplateParameters();
2820 unsigned NumParams = Params->size();
John McCalld5532b62009-11-23 01:53:49 +00002821 unsigned NumArgs = TemplateArgs.size();
Douglas Gregorc15cb382009-02-09 23:23:08 +00002822 bool Invalid = false;
2823
John McCalld5532b62009-11-23 01:53:49 +00002824 SourceLocation RAngleLoc = TemplateArgs.getRAngleLoc();
2825
Mike Stump1eb44332009-09-09 15:08:12 +00002826 bool HasParameterPack =
Anders Carlsson0ceffb52009-06-13 02:08:00 +00002827 NumParams > 0 && Params->getParam(NumParams - 1)->isTemplateParameterPack();
Mike Stump1eb44332009-09-09 15:08:12 +00002828
Anders Carlsson0ceffb52009-06-13 02:08:00 +00002829 if ((NumArgs > NumParams && !HasParameterPack) ||
Douglas Gregor16134c62009-07-01 00:28:38 +00002830 (NumArgs < Params->getMinRequiredArguments() &&
2831 !PartialTemplateArgs)) {
Douglas Gregorc15cb382009-02-09 23:23:08 +00002832 // FIXME: point at either the first arg beyond what we can handle,
2833 // or the '>', depending on whether we have too many or too few
2834 // arguments.
2835 SourceRange Range;
2836 if (NumArgs > NumParams)
Douglas Gregor40808ce2009-03-09 23:48:35 +00002837 Range = SourceRange(TemplateArgs[NumParams].getLocation(), RAngleLoc);
Douglas Gregorc15cb382009-02-09 23:23:08 +00002838 Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
2839 << (NumArgs > NumParams)
2840 << (isa<ClassTemplateDecl>(Template)? 0 :
2841 isa<FunctionTemplateDecl>(Template)? 1 :
2842 isa<TemplateTemplateParmDecl>(Template)? 2 : 3)
2843 << Template << Range;
Douglas Gregor62cb18d2009-02-11 18:16:40 +00002844 Diag(Template->getLocation(), diag::note_template_decl_here)
2845 << Params->getSourceRange();
Douglas Gregorc15cb382009-02-09 23:23:08 +00002846 Invalid = true;
2847 }
Mike Stump1eb44332009-09-09 15:08:12 +00002848
2849 // C++ [temp.arg]p1:
Douglas Gregorc15cb382009-02-09 23:23:08 +00002850 // [...] The type and form of each template-argument specified in
2851 // a template-id shall match the type and form specified for the
2852 // corresponding parameter declared by the template in its
2853 // template-parameter-list.
Douglas Gregor67714232011-03-03 02:41:12 +00002854 bool isTemplateTemplateParameter = isa<TemplateTemplateParmDecl>(Template);
Douglas Gregor14be16b2010-12-20 16:57:52 +00002855 llvm::SmallVector<TemplateArgument, 2> ArgumentPack;
2856 TemplateParameterList::iterator Param = Params->begin(),
2857 ParamEnd = Params->end();
Douglas Gregorc15cb382009-02-09 23:23:08 +00002858 unsigned ArgIdx = 0;
Douglas Gregor8dde14e2011-01-24 16:14:37 +00002859 LocalInstantiationScope InstScope(*this, true);
Douglas Gregor14be16b2010-12-20 16:57:52 +00002860 while (Param != ParamEnd) {
Douglas Gregorf35f8282009-11-11 21:54:23 +00002861 if (ArgIdx < NumArgs) {
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002862 // If we have an expanded parameter pack, make sure we don't have too
2863 // many arguments.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002864 if (NonTypeTemplateParmDecl *NTTP
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002865 = dyn_cast<NonTypeTemplateParmDecl>(*Param)) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002866 if (NTTP->isExpandedParameterPack() &&
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002867 ArgumentPack.size() >= NTTP->getNumExpansionTypes()) {
2868 Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
2869 << true
2870 << (isa<ClassTemplateDecl>(Template)? 0 :
2871 isa<FunctionTemplateDecl>(Template)? 1 :
2872 isa<TemplateTemplateParmDecl>(Template)? 2 : 3)
2873 << Template;
2874 Diag(Template->getLocation(), diag::note_template_decl_here)
2875 << Params->getSourceRange();
2876 return true;
2877 }
2878 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002879
Douglas Gregorf35f8282009-11-11 21:54:23 +00002880 // Check the template argument we were given.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002881 if (CheckTemplateArgument(*Param, TemplateArgs[ArgIdx], Template,
2882 TemplateLoc, RAngleLoc,
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002883 ArgumentPack.size(), Converted))
Douglas Gregorf35f8282009-11-11 21:54:23 +00002884 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002885
Douglas Gregor14be16b2010-12-20 16:57:52 +00002886 if ((*Param)->isTemplateParameterPack()) {
2887 // The template parameter was a template parameter pack, so take the
2888 // deduced argument and place it on the argument pack. Note that we
2889 // stay on the same template parameter so that we can deduce more
2890 // arguments.
2891 ArgumentPack.push_back(Converted.back());
2892 Converted.pop_back();
2893 } else {
2894 // Move to the next template parameter.
2895 ++Param;
2896 }
2897 ++ArgIdx;
Douglas Gregorf35f8282009-11-11 21:54:23 +00002898 continue;
Douglas Gregor3e00bad2009-02-17 01:05:43 +00002899 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002900
Douglas Gregor8735b292011-06-03 02:59:40 +00002901 // If we're checking a partial template argument list, we're done.
2902 if (PartialTemplateArgs) {
2903 if ((*Param)->isTemplateParameterPack() && !ArgumentPack.empty())
2904 Converted.push_back(TemplateArgument::CreatePackCopy(Context,
2905 ArgumentPack.data(),
2906 ArgumentPack.size()));
2907
2908 return Invalid;
2909 }
2910
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002911 // If we have a template parameter pack with no more corresponding
Douglas Gregor14be16b2010-12-20 16:57:52 +00002912 // arguments, just break out now and we'll fill in the argument pack below.
2913 if ((*Param)->isTemplateParameterPack())
2914 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002915
Douglas Gregorf968d832011-05-27 01:19:52 +00002916 // If our template is a template template parameter that hasn't acquired
2917 // its proper context yet (e.g., because we're using the template template
2918 // parameter in the signature of a function template, before we've built
2919 // the function template itself), don't attempt substitution of default
2920 // template arguments at this point: we don't have enough context to
2921 // do it properly.
2922 if (isTemplateTemplateParameter &&
2923 Template->getDeclContext()->isTranslationUnit())
2924 break;
2925
Douglas Gregorf35f8282009-11-11 21:54:23 +00002926 // We have a default template argument that we will use.
2927 TemplateArgumentLoc Arg;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002928
Douglas Gregorf35f8282009-11-11 21:54:23 +00002929 // Retrieve the default template argument from the template
2930 // parameter. For each kind of template parameter, we substitute the
2931 // template arguments provided thus far and any "outer" template arguments
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002932 // (when the template parameter was part of a nested template) into
Douglas Gregorf35f8282009-11-11 21:54:23 +00002933 // the default argument.
2934 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*Param)) {
2935 if (!TTP->hasDefaultArgument()) {
Douglas Gregor8735b292011-06-03 02:59:40 +00002936 assert(Invalid && "Missing default argument");
Douglas Gregorf35f8282009-11-11 21:54:23 +00002937 break;
2938 }
2939
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002940 TypeSourceInfo *ArgType = SubstDefaultTemplateArgument(*this,
Douglas Gregorf35f8282009-11-11 21:54:23 +00002941 Template,
2942 TemplateLoc,
2943 RAngleLoc,
2944 TTP,
2945 Converted);
2946 if (!ArgType)
2947 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002948
Douglas Gregorf35f8282009-11-11 21:54:23 +00002949 Arg = TemplateArgumentLoc(TemplateArgument(ArgType->getType()),
2950 ArgType);
2951 } else if (NonTypeTemplateParmDecl *NTTP
2952 = dyn_cast<NonTypeTemplateParmDecl>(*Param)) {
2953 if (!NTTP->hasDefaultArgument()) {
Douglas Gregor8735b292011-06-03 02:59:40 +00002954 assert(Invalid && "Missing default argument");
Douglas Gregorf35f8282009-11-11 21:54:23 +00002955 break;
2956 }
2957
John McCall60d7b3a2010-08-24 06:29:42 +00002958 ExprResult E = SubstDefaultTemplateArgument(*this, Template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002959 TemplateLoc,
2960 RAngleLoc,
2961 NTTP,
Douglas Gregorf35f8282009-11-11 21:54:23 +00002962 Converted);
2963 if (E.isInvalid())
2964 return true;
2965
2966 Expr *Ex = E.takeAs<Expr>();
2967 Arg = TemplateArgumentLoc(TemplateArgument(Ex), Ex);
2968 } else {
2969 TemplateTemplateParmDecl *TempParm
2970 = cast<TemplateTemplateParmDecl>(*Param);
2971
2972 if (!TempParm->hasDefaultArgument()) {
Douglas Gregor8735b292011-06-03 02:59:40 +00002973 assert(Invalid && "Missing default argument");
Douglas Gregorf35f8282009-11-11 21:54:23 +00002974 break;
2975 }
2976
Douglas Gregor1d752d72011-03-02 18:46:51 +00002977 NestedNameSpecifierLoc QualifierLoc;
Douglas Gregorf35f8282009-11-11 21:54:23 +00002978 TemplateName Name = SubstDefaultTemplateArgument(*this, Template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002979 TemplateLoc,
2980 RAngleLoc,
Douglas Gregorf35f8282009-11-11 21:54:23 +00002981 TempParm,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002982 Converted,
2983 QualifierLoc);
Douglas Gregorf35f8282009-11-11 21:54:23 +00002984 if (Name.isNull())
2985 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002986
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002987 Arg = TemplateArgumentLoc(TemplateArgument(Name), QualifierLoc,
2988 TempParm->getDefaultArgument().getTemplateNameLoc());
Douglas Gregorf35f8282009-11-11 21:54:23 +00002989 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002990
Douglas Gregorf35f8282009-11-11 21:54:23 +00002991 // Introduce an instantiation record that describes where we are using
2992 // the default template argument.
2993 InstantiatingTemplate Instantiating(*this, RAngleLoc, Template, *Param,
Douglas Gregor910f8002010-11-07 23:05:16 +00002994 Converted.data(), Converted.size(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002995 SourceRange(TemplateLoc, RAngleLoc));
2996
Douglas Gregorf35f8282009-11-11 21:54:23 +00002997 // Check the default template argument.
Douglas Gregord9e15302009-11-11 19:41:09 +00002998 if (CheckTemplateArgument(*Param, Arg, Template, TemplateLoc,
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002999 RAngleLoc, 0, Converted))
Douglas Gregore7526412009-11-11 19:31:23 +00003000 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003001
Douglas Gregor67714232011-03-03 02:41:12 +00003002 // Core issue 150 (assumed resolution): if this is a template template
3003 // parameter, keep track of the default template arguments from the
3004 // template definition.
3005 if (isTemplateTemplateParameter)
3006 TemplateArgs.addArgument(Arg);
3007
Douglas Gregor14be16b2010-12-20 16:57:52 +00003008 // Move to the next template parameter and argument.
3009 ++Param;
3010 ++ArgIdx;
Douglas Gregorc15cb382009-02-09 23:23:08 +00003011 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003012
Douglas Gregor14be16b2010-12-20 16:57:52 +00003013 // Form argument packs for each of the parameter packs remaining.
3014 while (Param != ParamEnd) {
Douglas Gregord3731192011-01-10 07:32:04 +00003015 // If we're checking a partial list of template arguments, don't fill
3016 // in arguments for non-template parameter packs.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003017
3018 if ((*Param)->isTemplateParameterPack()) {
Douglas Gregor8735b292011-06-03 02:59:40 +00003019 if (ArgumentPack.empty())
Douglas Gregor14be16b2010-12-20 16:57:52 +00003020 Converted.push_back(TemplateArgument(0, 0));
Douglas Gregor203e6a32011-01-11 23:09:57 +00003021 else {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003022 Converted.push_back(TemplateArgument::CreatePackCopy(Context,
3023 ArgumentPack.data(),
Douglas Gregor203e6a32011-01-11 23:09:57 +00003024 ArgumentPack.size()));
Douglas Gregor14be16b2010-12-20 16:57:52 +00003025 ArgumentPack.clear();
3026 }
3027 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003028
Douglas Gregor14be16b2010-12-20 16:57:52 +00003029 ++Param;
3030 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003031
Douglas Gregorc15cb382009-02-09 23:23:08 +00003032 return Invalid;
3033}
3034
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003035namespace {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003036 class UnnamedLocalNoLinkageFinder
3037 : public TypeVisitor<UnnamedLocalNoLinkageFinder, bool>
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003038 {
3039 Sema &S;
3040 SourceRange SR;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003041
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003042 typedef TypeVisitor<UnnamedLocalNoLinkageFinder, bool> inherited;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003043
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003044 public:
3045 UnnamedLocalNoLinkageFinder(Sema &S, SourceRange SR) : S(S), SR(SR) { }
3046
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003047 bool Visit(QualType T) {
3048 return inherited::Visit(T.getTypePtr());
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003049 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003050
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003051#define TYPE(Class, Parent) \
3052 bool Visit##Class##Type(const Class##Type *);
3053#define ABSTRACT_TYPE(Class, Parent) \
3054 bool Visit##Class##Type(const Class##Type *) { return false; }
3055#define NON_CANONICAL_TYPE(Class, Parent) \
3056 bool Visit##Class##Type(const Class##Type *) { return false; }
3057#include "clang/AST/TypeNodes.def"
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003058
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003059 bool VisitTagDecl(const TagDecl *Tag);
3060 bool VisitNestedNameSpecifier(NestedNameSpecifier *NNS);
3061 };
3062}
3063
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003064bool UnnamedLocalNoLinkageFinder::VisitBuiltinType(const BuiltinType*) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003065 return false;
3066}
3067
3068bool UnnamedLocalNoLinkageFinder::VisitComplexType(const ComplexType* T) {
3069 return Visit(T->getElementType());
3070}
3071
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003072bool UnnamedLocalNoLinkageFinder::VisitPointerType(const PointerType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003073 return Visit(T->getPointeeType());
3074}
3075
3076bool UnnamedLocalNoLinkageFinder::VisitBlockPointerType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003077 const BlockPointerType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003078 return Visit(T->getPointeeType());
3079}
3080
3081bool UnnamedLocalNoLinkageFinder::VisitLValueReferenceType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003082 const LValueReferenceType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003083 return Visit(T->getPointeeType());
3084}
3085
3086bool UnnamedLocalNoLinkageFinder::VisitRValueReferenceType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003087 const RValueReferenceType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003088 return Visit(T->getPointeeType());
3089}
3090
3091bool UnnamedLocalNoLinkageFinder::VisitMemberPointerType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003092 const MemberPointerType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003093 return Visit(T->getPointeeType()) || Visit(QualType(T->getClass(), 0));
3094}
3095
3096bool UnnamedLocalNoLinkageFinder::VisitConstantArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003097 const ConstantArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003098 return Visit(T->getElementType());
3099}
3100
3101bool UnnamedLocalNoLinkageFinder::VisitIncompleteArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003102 const IncompleteArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003103 return Visit(T->getElementType());
3104}
3105
3106bool UnnamedLocalNoLinkageFinder::VisitVariableArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003107 const VariableArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003108 return Visit(T->getElementType());
3109}
3110
3111bool UnnamedLocalNoLinkageFinder::VisitDependentSizedArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003112 const DependentSizedArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003113 return Visit(T->getElementType());
3114}
3115
3116bool UnnamedLocalNoLinkageFinder::VisitDependentSizedExtVectorType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003117 const DependentSizedExtVectorType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003118 return Visit(T->getElementType());
3119}
3120
3121bool UnnamedLocalNoLinkageFinder::VisitVectorType(const VectorType* T) {
3122 return Visit(T->getElementType());
3123}
3124
3125bool UnnamedLocalNoLinkageFinder::VisitExtVectorType(const ExtVectorType* T) {
3126 return Visit(T->getElementType());
3127}
3128
3129bool UnnamedLocalNoLinkageFinder::VisitFunctionProtoType(
3130 const FunctionProtoType* T) {
3131 for (FunctionProtoType::arg_type_iterator A = T->arg_type_begin(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003132 AEnd = T->arg_type_end();
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003133 A != AEnd; ++A) {
3134 if (Visit(*A))
3135 return true;
3136 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003137
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003138 return Visit(T->getResultType());
3139}
3140
3141bool UnnamedLocalNoLinkageFinder::VisitFunctionNoProtoType(
3142 const FunctionNoProtoType* T) {
3143 return Visit(T->getResultType());
3144}
3145
3146bool UnnamedLocalNoLinkageFinder::VisitUnresolvedUsingType(
3147 const UnresolvedUsingType*) {
3148 return false;
3149}
3150
3151bool UnnamedLocalNoLinkageFinder::VisitTypeOfExprType(const TypeOfExprType*) {
3152 return false;
3153}
3154
3155bool UnnamedLocalNoLinkageFinder::VisitTypeOfType(const TypeOfType* T) {
3156 return Visit(T->getUnderlyingType());
3157}
3158
3159bool UnnamedLocalNoLinkageFinder::VisitDecltypeType(const DecltypeType*) {
3160 return false;
3161}
3162
Sean Huntca63c202011-05-24 22:41:36 +00003163bool UnnamedLocalNoLinkageFinder::VisitUnaryTransformType(
3164 const UnaryTransformType*) {
3165 return false;
3166}
3167
Richard Smith34b41d92011-02-20 03:19:35 +00003168bool UnnamedLocalNoLinkageFinder::VisitAutoType(const AutoType *T) {
3169 return Visit(T->getDeducedType());
3170}
3171
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003172bool UnnamedLocalNoLinkageFinder::VisitRecordType(const RecordType* T) {
3173 return VisitTagDecl(T->getDecl());
3174}
3175
3176bool UnnamedLocalNoLinkageFinder::VisitEnumType(const EnumType* T) {
3177 return VisitTagDecl(T->getDecl());
3178}
3179
3180bool UnnamedLocalNoLinkageFinder::VisitTemplateTypeParmType(
3181 const TemplateTypeParmType*) {
3182 return false;
3183}
3184
Douglas Gregorc3069d62011-01-14 02:55:32 +00003185bool UnnamedLocalNoLinkageFinder::VisitSubstTemplateTypeParmPackType(
3186 const SubstTemplateTypeParmPackType *) {
3187 return false;
3188}
3189
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003190bool UnnamedLocalNoLinkageFinder::VisitTemplateSpecializationType(
3191 const TemplateSpecializationType*) {
3192 return false;
3193}
3194
3195bool UnnamedLocalNoLinkageFinder::VisitInjectedClassNameType(
3196 const InjectedClassNameType* T) {
3197 return VisitTagDecl(T->getDecl());
3198}
3199
3200bool UnnamedLocalNoLinkageFinder::VisitDependentNameType(
3201 const DependentNameType* T) {
3202 return VisitNestedNameSpecifier(T->getQualifier());
3203}
3204
3205bool UnnamedLocalNoLinkageFinder::VisitDependentTemplateSpecializationType(
3206 const DependentTemplateSpecializationType* T) {
3207 return VisitNestedNameSpecifier(T->getQualifier());
3208}
3209
Douglas Gregor7536dd52010-12-20 02:24:11 +00003210bool UnnamedLocalNoLinkageFinder::VisitPackExpansionType(
3211 const PackExpansionType* T) {
3212 return Visit(T->getPattern());
3213}
3214
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003215bool UnnamedLocalNoLinkageFinder::VisitObjCObjectType(const ObjCObjectType *) {
3216 return false;
3217}
3218
3219bool UnnamedLocalNoLinkageFinder::VisitObjCInterfaceType(
3220 const ObjCInterfaceType *) {
3221 return false;
3222}
3223
3224bool UnnamedLocalNoLinkageFinder::VisitObjCObjectPointerType(
3225 const ObjCObjectPointerType *) {
3226 return false;
3227}
3228
3229bool UnnamedLocalNoLinkageFinder::VisitTagDecl(const TagDecl *Tag) {
3230 if (Tag->getDeclContext()->isFunctionOrMethod()) {
3231 S.Diag(SR.getBegin(), diag::ext_template_arg_local_type)
3232 << S.Context.getTypeDeclType(Tag) << SR;
3233 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003234 }
3235
Richard Smith162e1c12011-04-15 14:24:37 +00003236 if (!Tag->getDeclName() && !Tag->getTypedefNameForAnonDecl()) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003237 S.Diag(SR.getBegin(), diag::ext_template_arg_unnamed_type) << SR;
3238 S.Diag(Tag->getLocation(), diag::note_template_unnamed_type_here);
3239 return true;
3240 }
3241
3242 return false;
3243}
3244
3245bool UnnamedLocalNoLinkageFinder::VisitNestedNameSpecifier(
3246 NestedNameSpecifier *NNS) {
3247 if (NNS->getPrefix() && VisitNestedNameSpecifier(NNS->getPrefix()))
3248 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003249
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003250 switch (NNS->getKind()) {
3251 case NestedNameSpecifier::Identifier:
3252 case NestedNameSpecifier::Namespace:
Douglas Gregor14aba762011-02-24 02:36:08 +00003253 case NestedNameSpecifier::NamespaceAlias:
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003254 case NestedNameSpecifier::Global:
3255 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003256
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003257 case NestedNameSpecifier::TypeSpec:
3258 case NestedNameSpecifier::TypeSpecWithTemplate:
3259 return Visit(QualType(NNS->getAsType(), 0));
3260 }
Fariborz Jahanian7b1ec6c2010-10-13 16:19:16 +00003261 return false;
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003262}
3263
3264
Douglas Gregorc15cb382009-02-09 23:23:08 +00003265/// \brief Check a template argument against its corresponding
3266/// template type parameter.
3267///
3268/// This routine implements the semantics of C++ [temp.arg.type]. It
3269/// returns true if an error occurred, and false otherwise.
Mike Stump1eb44332009-09-09 15:08:12 +00003270bool Sema::CheckTemplateArgument(TemplateTypeParmDecl *Param,
John McCalla93c9342009-12-07 02:54:59 +00003271 TypeSourceInfo *ArgInfo) {
3272 assert(ArgInfo && "invalid TypeSourceInfo");
John McCall833ca992009-10-29 08:12:44 +00003273 QualType Arg = ArgInfo->getType();
Douglas Gregor0fddb972010-05-22 16:17:30 +00003274 SourceRange SR = ArgInfo->getTypeLoc().getSourceRange();
Chandler Carruth17fb8552010-09-03 21:12:34 +00003275
3276 if (Arg->isVariablyModifiedType()) {
3277 return Diag(SR.getBegin(), diag::err_variably_modified_template_arg) << Arg;
Douglas Gregor4b52e252009-12-21 23:17:24 +00003278 } else if (Context.hasSameUnqualifiedType(Arg, Context.OverloadTy)) {
Douglas Gregor4b52e252009-12-21 23:17:24 +00003279 return Diag(SR.getBegin(), diag::err_template_arg_overload_type) << SR;
Douglas Gregorc15cb382009-02-09 23:23:08 +00003280 }
3281
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003282 // C++03 [temp.arg.type]p2:
3283 // A local type, a type with no linkage, an unnamed type or a type
3284 // compounded from any of these types shall not be used as a
3285 // template-argument for a template type-parameter.
3286 //
3287 // C++0x allows these, and even in C++03 we allow them as an extension with
3288 // a warning.
Douglas Gregordb4d4bb2010-10-13 18:05:20 +00003289 if (!LangOpts.CPlusPlus0x && Arg->hasUnnamedOrLocalType()) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003290 UnnamedLocalNoLinkageFinder Finder(*this, SR);
3291 (void)Finder.Visit(Context.getCanonicalType(Arg));
3292 }
3293
Douglas Gregorc15cb382009-02-09 23:23:08 +00003294 return false;
3295}
3296
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003297/// \brief Checks whether the given template argument is the address
3298/// of an object or function according to C++ [temp.arg.nontype]p1.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003299static bool
Douglas Gregorb7a09262010-04-01 18:32:35 +00003300CheckTemplateArgumentAddressOfObjectOrFunction(Sema &S,
3301 NonTypeTemplateParmDecl *Param,
3302 QualType ParamType,
3303 Expr *ArgIn,
3304 TemplateArgument &Converted) {
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003305 bool Invalid = false;
Douglas Gregorb7a09262010-04-01 18:32:35 +00003306 Expr *Arg = ArgIn;
3307 QualType ArgType = Arg->getType();
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003308
3309 // See through any implicit casts we added to fix the type.
Eli Friedman73c39ab2009-10-20 08:27:19 +00003310 while (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg))
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003311 Arg = Cast->getSubExpr();
3312
3313 // C++ [temp.arg.nontype]p1:
Mike Stump1eb44332009-09-09 15:08:12 +00003314 //
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003315 // A template-argument for a non-type, non-template
3316 // template-parameter shall be one of: [...]
3317 //
3318 // -- the address of an object or function with external
3319 // linkage, including function templates and function
3320 // template-ids but excluding non-static class members,
3321 // expressed as & id-expression where the & is optional if
3322 // the name refers to a function or array, or if the
3323 // corresponding template-parameter is a reference; or
3324 DeclRefExpr *DRE = 0;
Mike Stump1eb44332009-09-09 15:08:12 +00003325
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00003326 // In C++98/03 mode, give an extension warning on any extra parentheses.
3327 // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773
3328 bool ExtraParens = false;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003329 while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) {
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00003330 if (!Invalid && !ExtraParens && !S.getLangOptions().CPlusPlus0x) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00003331 S.Diag(Arg->getSourceRange().getBegin(),
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00003332 diag::ext_template_arg_extra_parens)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003333 << Arg->getSourceRange();
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00003334 ExtraParens = true;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003335 }
3336
3337 Arg = Parens->getSubExpr();
3338 }
3339
Douglas Gregorb7a09262010-04-01 18:32:35 +00003340 bool AddressTaken = false;
3341 SourceLocation AddrOpLoc;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003342 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
John McCall2de56d12010-08-25 11:45:40 +00003343 if (UnOp->getOpcode() == UO_AddrOf) {
Francois Pichet11f98d02011-04-28 05:12:34 +00003344 // Support &__uuidof(class_with_uuid) as a non-type template argument.
3345 // Very common in Microsoft COM headers.
3346 if (S.getLangOptions().Microsoft &&
3347 isa<CXXUuidofExpr>(UnOp->getSubExpr())) {
3348 Converted = TemplateArgument(ArgIn);
3349 return false;
3350 }
3351
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003352 DRE = dyn_cast<DeclRefExpr>(UnOp->getSubExpr());
Douglas Gregorb7a09262010-04-01 18:32:35 +00003353 AddressTaken = true;
3354 AddrOpLoc = UnOp->getOperatorLoc();
3355 }
Francois Picheta343a412011-04-29 09:08:14 +00003356 } else {
3357 if (S.getLangOptions().Microsoft && isa<CXXUuidofExpr>(Arg)) {
3358 Converted = TemplateArgument(ArgIn);
3359 return false;
3360 }
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003361 DRE = dyn_cast<DeclRefExpr>(Arg);
Francois Picheta343a412011-04-29 09:08:14 +00003362 }
Douglas Gregorb7a09262010-04-01 18:32:35 +00003363 if (!DRE) {
Douglas Gregor1a8cf732010-04-14 23:11:21 +00003364 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_decl_ref)
3365 << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003366 S.Diag(Param->getLocation(), diag::note_template_param_here);
3367 return true;
3368 }
Chandler Carruth038cc392010-01-31 10:01:20 +00003369
3370 // Stop checking the precise nature of the argument if it is value dependent,
3371 // it should be checked when instantiated.
Douglas Gregorb7a09262010-04-01 18:32:35 +00003372 if (Arg->isValueDependent()) {
John McCall3fa5cae2010-10-26 07:05:15 +00003373 Converted = TemplateArgument(ArgIn);
Chandler Carruth038cc392010-01-31 10:01:20 +00003374 return false;
Douglas Gregorb7a09262010-04-01 18:32:35 +00003375 }
Chandler Carruth038cc392010-01-31 10:01:20 +00003376
Douglas Gregorb7a09262010-04-01 18:32:35 +00003377 if (!isa<ValueDecl>(DRE->getDecl())) {
3378 S.Diag(Arg->getSourceRange().getBegin(),
3379 diag::err_template_arg_not_object_or_func_form)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003380 << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003381 S.Diag(Param->getLocation(), diag::note_template_param_here);
3382 return true;
3383 }
3384
3385 NamedDecl *Entity = 0;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003386
3387 // Cannot refer to non-static data members
Douglas Gregorb7a09262010-04-01 18:32:35 +00003388 if (FieldDecl *Field = dyn_cast<FieldDecl>(DRE->getDecl())) {
3389 S.Diag(Arg->getSourceRange().getBegin(), diag::err_template_arg_field)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003390 << Field << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003391 S.Diag(Param->getLocation(), diag::note_template_param_here);
3392 return true;
3393 }
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003394
3395 // Cannot refer to non-static member functions
3396 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(DRE->getDecl()))
Douglas Gregorb7a09262010-04-01 18:32:35 +00003397 if (!Method->isStatic()) {
3398 S.Diag(Arg->getSourceRange().getBegin(), diag::err_template_arg_method)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003399 << Method << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003400 S.Diag(Param->getLocation(), diag::note_template_param_here);
3401 return true;
3402 }
Mike Stump1eb44332009-09-09 15:08:12 +00003403
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003404 // Functions must have external linkage.
3405 if (FunctionDecl *Func = dyn_cast<FunctionDecl>(DRE->getDecl())) {
Douglas Gregor0b6bc8b2010-02-03 09:33:45 +00003406 if (!isExternalLinkage(Func->getLinkage())) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00003407 S.Diag(Arg->getSourceRange().getBegin(),
3408 diag::err_template_arg_function_not_extern)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003409 << Func << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003410 S.Diag(Func->getLocation(), diag::note_template_arg_internal_object)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003411 << true;
3412 return true;
3413 }
3414
3415 // Okay: we've named a function with external linkage.
Douglas Gregor3e00bad2009-02-17 01:05:43 +00003416 Entity = Func;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003417
Douglas Gregorb7a09262010-04-01 18:32:35 +00003418 // If the template parameter has pointer type, the function decays.
3419 if (ParamType->isPointerType() && !AddressTaken)
3420 ArgType = S.Context.getPointerType(Func->getType());
3421 else if (AddressTaken && ParamType->isReferenceType()) {
3422 // If we originally had an address-of operator, but the
3423 // parameter has reference type, complain and (if things look
3424 // like they will work) drop the address-of operator.
3425 if (!S.Context.hasSameUnqualifiedType(Func->getType(),
3426 ParamType.getNonReferenceType())) {
3427 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
3428 << ParamType;
3429 S.Diag(Param->getLocation(), diag::note_template_param_here);
3430 return true;
3431 }
3432
3433 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
3434 << ParamType
3435 << FixItHint::CreateRemoval(AddrOpLoc);
3436 S.Diag(Param->getLocation(), diag::note_template_param_here);
3437
3438 ArgType = Func->getType();
3439 }
3440 } else if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
Douglas Gregor0b6bc8b2010-02-03 09:33:45 +00003441 if (!isExternalLinkage(Var->getLinkage())) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00003442 S.Diag(Arg->getSourceRange().getBegin(),
3443 diag::err_template_arg_object_not_extern)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003444 << Var << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003445 S.Diag(Var->getLocation(), diag::note_template_arg_internal_object)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003446 << true;
3447 return true;
3448 }
3449
Douglas Gregorb7a09262010-04-01 18:32:35 +00003450 // A value of reference type is not an object.
3451 if (Var->getType()->isReferenceType()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003452 S.Diag(Arg->getSourceRange().getBegin(),
Douglas Gregorb7a09262010-04-01 18:32:35 +00003453 diag::err_template_arg_reference_var)
3454 << Var->getType() << Arg->getSourceRange();
3455 S.Diag(Param->getLocation(), diag::note_template_param_here);
3456 return true;
3457 }
3458
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003459 // Okay: we've named an object with external linkage
Douglas Gregor3e00bad2009-02-17 01:05:43 +00003460 Entity = Var;
Douglas Gregorb7a09262010-04-01 18:32:35 +00003461
3462 // If the template parameter has pointer type, we must have taken
3463 // the address of this object.
3464 if (ParamType->isReferenceType()) {
3465 if (AddressTaken) {
3466 // If we originally had an address-of operator, but the
3467 // parameter has reference type, complain and (if things look
3468 // like they will work) drop the address-of operator.
3469 if (!S.Context.hasSameUnqualifiedType(Var->getType(),
3470 ParamType.getNonReferenceType())) {
3471 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
3472 << ParamType;
3473 S.Diag(Param->getLocation(), diag::note_template_param_here);
3474 return true;
3475 }
3476
3477 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
3478 << ParamType
3479 << FixItHint::CreateRemoval(AddrOpLoc);
3480 S.Diag(Param->getLocation(), diag::note_template_param_here);
3481
3482 ArgType = Var->getType();
3483 }
3484 } else if (!AddressTaken && ParamType->isPointerType()) {
3485 if (Var->getType()->isArrayType()) {
3486 // Array-to-pointer decay.
3487 ArgType = S.Context.getArrayDecayedType(Var->getType());
3488 } else {
3489 // If the template parameter has pointer type but the address of
3490 // this object was not taken, complain and (possibly) recover by
3491 // taking the address of the entity.
3492 ArgType = S.Context.getPointerType(Var->getType());
3493 if (!S.Context.hasSameUnqualifiedType(ArgType, ParamType)) {
3494 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_address_of)
3495 << ParamType;
3496 S.Diag(Param->getLocation(), diag::note_template_param_here);
3497 return true;
3498 }
3499
3500 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_address_of)
3501 << ParamType
3502 << FixItHint::CreateInsertion(Arg->getLocStart(), "&");
3503
3504 S.Diag(Param->getLocation(), diag::note_template_param_here);
3505 }
3506 }
3507 } else {
3508 // We found something else, but we don't know specifically what it is.
3509 S.Diag(Arg->getSourceRange().getBegin(),
3510 diag::err_template_arg_not_object_or_func)
3511 << Arg->getSourceRange();
3512 S.Diag(DRE->getDecl()->getLocation(), diag::note_template_arg_refers_here);
3513 return true;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003514 }
Mike Stump1eb44332009-09-09 15:08:12 +00003515
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003516 if (ParamType->isPointerType() &&
Douglas Gregorb7a09262010-04-01 18:32:35 +00003517 !ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType() &&
Douglas Gregor14d0aee2011-01-27 00:58:17 +00003518 S.IsQualificationConversion(ArgType, ParamType, false)) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00003519 // For pointer-to-object types, qualification conversions are
3520 // permitted.
3521 } else {
3522 if (const ReferenceType *ParamRef = ParamType->getAs<ReferenceType>()) {
3523 if (!ParamRef->getPointeeType()->isFunctionType()) {
3524 // C++ [temp.arg.nontype]p5b3:
3525 // For a non-type template-parameter of type reference to
3526 // object, no conversions apply. The type referred to by the
3527 // reference may be more cv-qualified than the (otherwise
3528 // identical) type of the template- argument. The
3529 // template-parameter is bound directly to the
3530 // template-argument, which shall be an lvalue.
3531
3532 // FIXME: Other qualifiers?
3533 unsigned ParamQuals = ParamRef->getPointeeType().getCVRQualifiers();
3534 unsigned ArgQuals = ArgType.getCVRQualifiers();
3535
3536 if ((ParamQuals | ArgQuals) != ParamQuals) {
3537 S.Diag(Arg->getSourceRange().getBegin(),
3538 diag::err_template_arg_ref_bind_ignores_quals)
3539 << ParamType << Arg->getType()
3540 << Arg->getSourceRange();
3541 S.Diag(Param->getLocation(), diag::note_template_param_here);
3542 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003543 }
Douglas Gregorb7a09262010-04-01 18:32:35 +00003544 }
3545 }
3546
3547 // At this point, the template argument refers to an object or
3548 // function with external linkage. We now need to check whether the
3549 // argument and parameter types are compatible.
3550 if (!S.Context.hasSameUnqualifiedType(ArgType,
3551 ParamType.getNonReferenceType())) {
3552 // We can't perform this conversion or binding.
3553 if (ParamType->isReferenceType())
3554 S.Diag(Arg->getLocStart(), diag::err_template_arg_no_ref_bind)
3555 << ParamType << Arg->getType() << Arg->getSourceRange();
3556 else
3557 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_convertible)
3558 << Arg->getType() << ParamType << Arg->getSourceRange();
3559 S.Diag(Param->getLocation(), diag::note_template_param_here);
3560 return true;
3561 }
3562 }
3563
3564 // Create the template argument.
3565 Converted = TemplateArgument(Entity->getCanonicalDecl());
Douglas Gregor77c13e02010-04-24 18:20:53 +00003566 S.MarkDeclarationReferenced(Arg->getLocStart(), Entity);
Douglas Gregorb7a09262010-04-01 18:32:35 +00003567 return false;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003568}
3569
3570/// \brief Checks whether the given template argument is a pointer to
3571/// member constant according to C++ [temp.arg.nontype]p1.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003572bool Sema::CheckTemplateArgumentPointerToMember(Expr *Arg,
Douglas Gregorcaddba02009-11-12 18:38:13 +00003573 TemplateArgument &Converted) {
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003574 bool Invalid = false;
3575
3576 // See through any implicit casts we added to fix the type.
Eli Friedman73c39ab2009-10-20 08:27:19 +00003577 while (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg))
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003578 Arg = Cast->getSubExpr();
3579
3580 // C++ [temp.arg.nontype]p1:
Mike Stump1eb44332009-09-09 15:08:12 +00003581 //
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003582 // A template-argument for a non-type, non-template
3583 // template-parameter shall be one of: [...]
3584 //
3585 // -- a pointer to member expressed as described in 5.3.1.
Douglas Gregora2813ce2009-10-23 18:54:35 +00003586 DeclRefExpr *DRE = 0;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003587
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00003588 // In C++98/03 mode, give an extension warning on any extra parentheses.
3589 // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773
3590 bool ExtraParens = false;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003591 while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) {
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00003592 if (!Invalid && !ExtraParens && !getLangOptions().CPlusPlus0x) {
Mike Stump1eb44332009-09-09 15:08:12 +00003593 Diag(Arg->getSourceRange().getBegin(),
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00003594 diag::ext_template_arg_extra_parens)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003595 << Arg->getSourceRange();
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00003596 ExtraParens = true;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003597 }
3598
3599 Arg = Parens->getSubExpr();
3600 }
3601
Douglas Gregorcaddba02009-11-12 18:38:13 +00003602 // A pointer-to-member constant written &Class::member.
3603 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
John McCall2de56d12010-08-25 11:45:40 +00003604 if (UnOp->getOpcode() == UO_AddrOf) {
Douglas Gregora2813ce2009-10-23 18:54:35 +00003605 DRE = dyn_cast<DeclRefExpr>(UnOp->getSubExpr());
3606 if (DRE && !DRE->getQualifier())
3607 DRE = 0;
3608 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003609 }
Douglas Gregorcaddba02009-11-12 18:38:13 +00003610 // A constant of pointer-to-member type.
3611 else if ((DRE = dyn_cast<DeclRefExpr>(Arg))) {
3612 if (ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) {
3613 if (VD->getType()->isMemberPointerType()) {
3614 if (isa<NonTypeTemplateParmDecl>(VD) ||
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003615 (isa<VarDecl>(VD) &&
Douglas Gregorcaddba02009-11-12 18:38:13 +00003616 Context.getCanonicalType(VD->getType()).isConstQualified())) {
3617 if (Arg->isTypeDependent() || Arg->isValueDependent())
John McCall3fa5cae2010-10-26 07:05:15 +00003618 Converted = TemplateArgument(Arg);
Douglas Gregorcaddba02009-11-12 18:38:13 +00003619 else
3620 Converted = TemplateArgument(VD->getCanonicalDecl());
3621 return Invalid;
3622 }
3623 }
3624 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003625
Douglas Gregorcaddba02009-11-12 18:38:13 +00003626 DRE = 0;
3627 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003628
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003629 if (!DRE)
3630 return Diag(Arg->getSourceRange().getBegin(),
3631 diag::err_template_arg_not_pointer_to_member_form)
3632 << Arg->getSourceRange();
3633
3634 if (isa<FieldDecl>(DRE->getDecl()) || isa<CXXMethodDecl>(DRE->getDecl())) {
3635 assert((isa<FieldDecl>(DRE->getDecl()) ||
3636 !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) &&
3637 "Only non-static member pointers can make it here");
3638
3639 // Okay: this is the address of a non-static member, and therefore
3640 // a member pointer constant.
Douglas Gregorcaddba02009-11-12 18:38:13 +00003641 if (Arg->isTypeDependent() || Arg->isValueDependent())
John McCall3fa5cae2010-10-26 07:05:15 +00003642 Converted = TemplateArgument(Arg);
Douglas Gregorcaddba02009-11-12 18:38:13 +00003643 else
3644 Converted = TemplateArgument(DRE->getDecl()->getCanonicalDecl());
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003645 return Invalid;
3646 }
3647
3648 // We found something else, but we don't know specifically what it is.
Mike Stump1eb44332009-09-09 15:08:12 +00003649 Diag(Arg->getSourceRange().getBegin(),
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003650 diag::err_template_arg_not_pointer_to_member_form)
3651 << Arg->getSourceRange();
Mike Stump1eb44332009-09-09 15:08:12 +00003652 Diag(DRE->getDecl()->getLocation(),
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003653 diag::note_template_arg_refers_here);
3654 return true;
3655}
3656
Douglas Gregorc15cb382009-02-09 23:23:08 +00003657/// \brief Check a template argument against its corresponding
3658/// non-type template parameter.
3659///
Douglas Gregor2943aed2009-03-03 04:44:36 +00003660/// This routine implements the semantics of C++ [temp.arg.nontype].
John Wiegley429bb272011-04-08 18:41:53 +00003661/// If an error occurred, it returns ExprError(); otherwise, it
3662/// returns the converted template argument. \p
Douglas Gregor2943aed2009-03-03 04:44:36 +00003663/// InstantiatedParamType is the type of the non-type template
3664/// parameter after it has been instantiated.
John Wiegley429bb272011-04-08 18:41:53 +00003665ExprResult Sema::CheckTemplateArgument(NonTypeTemplateParmDecl *Param,
3666 QualType InstantiatedParamType, Expr *Arg,
3667 TemplateArgument &Converted,
3668 CheckTemplateArgumentKind CTAK) {
Douglas Gregor40808ce2009-03-09 23:48:35 +00003669 SourceLocation StartLoc = Arg->getSourceRange().getBegin();
3670
Douglas Gregor6ae5e662009-02-10 23:36:10 +00003671 // If either the parameter has a dependent type or the argument is
3672 // type-dependent, there's nothing we can check now.
Douglas Gregor40808ce2009-03-09 23:48:35 +00003673 if (InstantiatedParamType->isDependentType() || Arg->isTypeDependent()) {
3674 // FIXME: Produce a cloned, canonical expression?
Douglas Gregor02cbbd22009-06-11 18:10:32 +00003675 Converted = TemplateArgument(Arg);
John Wiegley429bb272011-04-08 18:41:53 +00003676 return Owned(Arg);
Douglas Gregor40808ce2009-03-09 23:48:35 +00003677 }
Douglas Gregor6ae5e662009-02-10 23:36:10 +00003678
3679 // C++ [temp.arg.nontype]p5:
3680 // The following conversions are performed on each expression used
3681 // as a non-type template-argument. If a non-type
3682 // template-argument cannot be converted to the type of the
3683 // corresponding template-parameter then the program is
3684 // ill-formed.
3685 //
3686 // -- for a non-type template-parameter of integral or
3687 // enumeration type, integral promotions (4.5) and integral
3688 // conversions (4.7) are applied.
Douglas Gregor2943aed2009-03-03 04:44:36 +00003689 QualType ParamType = InstantiatedParamType;
Douglas Gregora35284b2009-02-11 00:19:33 +00003690 QualType ArgType = Arg->getType();
Douglas Gregor2ade35e2010-06-16 00:17:44 +00003691 if (ParamType->isIntegralOrEnumerationType()) {
Douglas Gregor6ae5e662009-02-10 23:36:10 +00003692 // C++ [temp.arg.nontype]p1:
3693 // A template-argument for a non-type, non-template
3694 // template-parameter shall be one of:
3695 //
3696 // -- an integral constant-expression of integral or enumeration
3697 // type; or
3698 // -- the name of a non-type template-parameter; or
3699 SourceLocation NonConstantLoc;
Douglas Gregor3e00bad2009-02-17 01:05:43 +00003700 llvm::APSInt Value;
Douglas Gregor2ade35e2010-06-16 00:17:44 +00003701 if (!ArgType->isIntegralOrEnumerationType()) {
Mike Stump1eb44332009-09-09 15:08:12 +00003702 Diag(Arg->getSourceRange().getBegin(),
Douglas Gregor6ae5e662009-02-10 23:36:10 +00003703 diag::err_template_arg_not_integral_or_enumeral)
3704 << ArgType << Arg->getSourceRange();
3705 Diag(Param->getLocation(), diag::note_template_param_here);
John Wiegley429bb272011-04-08 18:41:53 +00003706 return ExprError();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00003707 } else if (!Arg->isValueDependent() &&
Douglas Gregor3e00bad2009-02-17 01:05:43 +00003708 !Arg->isIntegerConstantExpr(Value, Context, &NonConstantLoc)) {
Douglas Gregor6ae5e662009-02-10 23:36:10 +00003709 Diag(NonConstantLoc, diag::err_template_arg_not_ice)
3710 << ArgType << Arg->getSourceRange();
John Wiegley429bb272011-04-08 18:41:53 +00003711 return ExprError();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00003712 }
3713
Douglas Gregor02024a92010-03-28 02:42:43 +00003714 // From here on out, all we care about are the unqualified forms
3715 // of the parameter and argument types.
3716 ParamType = ParamType.getUnqualifiedType();
3717 ArgType = ArgType.getUnqualifiedType();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00003718
3719 // Try to convert the argument to the parameter's type.
Douglas Gregorff524392009-11-04 21:50:46 +00003720 if (Context.hasSameType(ParamType, ArgType)) {
Douglas Gregor6ae5e662009-02-10 23:36:10 +00003721 // Okay: no conversion necessary
Douglas Gregor02024a92010-03-28 02:42:43 +00003722 } else if (CTAK == CTAK_Deduced) {
3723 // C++ [temp.deduct.type]p17:
3724 // If, in the declaration of a function template with a non-type
3725 // template-parameter, the non-type template- parameter is used
3726 // in an expression in the function parameter-list and, if the
3727 // corresponding template-argument is deduced, the
3728 // template-argument type shall match the type of the
3729 // template-parameter exactly, except that a template-argument
3730 // deduced from an array bound may be of any integral type.
3731 Diag(StartLoc, diag::err_deduced_non_type_template_arg_type_mismatch)
3732 << ArgType << ParamType;
3733 Diag(Param->getLocation(), diag::note_template_param_here);
John Wiegley429bb272011-04-08 18:41:53 +00003734 return ExprError();
John McCalldaa8e4e2010-11-15 09:13:47 +00003735 } else if (ParamType->isBooleanType()) {
3736 // This is an integral-to-boolean conversion.
John Wiegley429bb272011-04-08 18:41:53 +00003737 Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralToBoolean).take();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00003738 } else if (IsIntegralPromotion(Arg, ArgType, ParamType) ||
3739 !ParamType->isEnumeralType()) {
3740 // This is an integral promotion or conversion.
John Wiegley429bb272011-04-08 18:41:53 +00003741 Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralCast).take();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00003742 } else {
3743 // We can't perform this conversion.
Mike Stump1eb44332009-09-09 15:08:12 +00003744 Diag(Arg->getSourceRange().getBegin(),
Douglas Gregor6ae5e662009-02-10 23:36:10 +00003745 diag::err_template_arg_not_convertible)
Douglas Gregor2943aed2009-03-03 04:44:36 +00003746 << Arg->getType() << InstantiatedParamType << Arg->getSourceRange();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00003747 Diag(Param->getLocation(), diag::note_template_param_here);
John Wiegley429bb272011-04-08 18:41:53 +00003748 return ExprError();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00003749 }
3750
Douglas Gregorc7469372011-05-04 21:55:00 +00003751 // Add the value of this argument to the list of converted
3752 // arguments. We use the bitwidth and signedness of the template
3753 // parameter.
3754 if (Arg->isValueDependent()) {
3755 // The argument is value-dependent. Create a new
3756 // TemplateArgument with the converted expression.
3757 Converted = TemplateArgument(Arg);
3758 return Owned(Arg);
3759 }
3760
Douglas Gregorf80a9d52009-03-14 00:20:21 +00003761 QualType IntegerType = Context.getCanonicalType(ParamType);
John McCall183700f2009-09-21 23:43:11 +00003762 if (const EnumType *Enum = IntegerType->getAs<EnumType>())
Douglas Gregor02cbbd22009-06-11 18:10:32 +00003763 IntegerType = Context.getCanonicalType(Enum->getDecl()->getIntegerType());
Douglas Gregorf80a9d52009-03-14 00:20:21 +00003764
Douglas Gregorc7469372011-05-04 21:55:00 +00003765 if (ParamType->isBooleanType()) {
3766 // Value must be zero or one.
3767 Value = Value != 0;
3768 unsigned AllowedBits = Context.getTypeSize(IntegerType);
3769 if (Value.getBitWidth() != AllowedBits)
3770 Value = Value.extOrTrunc(AllowedBits);
Douglas Gregor575a1c92011-05-20 16:38:50 +00003771 Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType());
Douglas Gregorc7469372011-05-04 21:55:00 +00003772 } else {
Douglas Gregor1a6e0342010-03-26 02:38:37 +00003773 llvm::APSInt OldValue = Value;
Douglas Gregorc7469372011-05-04 21:55:00 +00003774
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003775 // Coerce the template argument's value to the value it will have
Douglas Gregor1a6e0342010-03-26 02:38:37 +00003776 // based on the template parameter's type.
Douglas Gregor0d4fd8e2010-03-26 00:39:40 +00003777 unsigned AllowedBits = Context.getTypeSize(IntegerType);
Douglas Gregor0d4fd8e2010-03-26 00:39:40 +00003778 if (Value.getBitWidth() != AllowedBits)
Jay Foad9f71a8f2010-12-07 08:25:34 +00003779 Value = Value.extOrTrunc(AllowedBits);
Douglas Gregor575a1c92011-05-20 16:38:50 +00003780 Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType());
Douglas Gregorc7469372011-05-04 21:55:00 +00003781
Douglas Gregor1a6e0342010-03-26 02:38:37 +00003782 // Complain if an unsigned parameter received a negative value.
Douglas Gregor575a1c92011-05-20 16:38:50 +00003783 if (IntegerType->isUnsignedIntegerOrEnumerationType()
Douglas Gregorc7469372011-05-04 21:55:00 +00003784 && (OldValue.isSigned() && OldValue.isNegative())) {
Douglas Gregor1a6e0342010-03-26 02:38:37 +00003785 Diag(Arg->getSourceRange().getBegin(), diag::warn_template_arg_negative)
3786 << OldValue.toString(10) << Value.toString(10) << Param->getType()
3787 << Arg->getSourceRange();
3788 Diag(Param->getLocation(), diag::note_template_param_here);
3789 }
Douglas Gregorc7469372011-05-04 21:55:00 +00003790
Douglas Gregor1a6e0342010-03-26 02:38:37 +00003791 // Complain if we overflowed the template parameter's type.
3792 unsigned RequiredBits;
Douglas Gregor575a1c92011-05-20 16:38:50 +00003793 if (IntegerType->isUnsignedIntegerOrEnumerationType())
Douglas Gregor1a6e0342010-03-26 02:38:37 +00003794 RequiredBits = OldValue.getActiveBits();
3795 else if (OldValue.isUnsigned())
3796 RequiredBits = OldValue.getActiveBits() + 1;
3797 else
3798 RequiredBits = OldValue.getMinSignedBits();
3799 if (RequiredBits > AllowedBits) {
3800 Diag(Arg->getSourceRange().getBegin(),
3801 diag::warn_template_arg_too_large)
3802 << OldValue.toString(10) << Value.toString(10) << Param->getType()
3803 << Arg->getSourceRange();
3804 Diag(Param->getLocation(), diag::note_template_param_here);
3805 }
Douglas Gregorf80a9d52009-03-14 00:20:21 +00003806 }
Douglas Gregor3e00bad2009-02-17 01:05:43 +00003807
John McCall833ca992009-10-29 08:12:44 +00003808 Converted = TemplateArgument(Value,
Mike Stump1eb44332009-09-09 15:08:12 +00003809 ParamType->isEnumeralType() ? ParamType
Douglas Gregor02cbbd22009-06-11 18:10:32 +00003810 : IntegerType);
John Wiegley429bb272011-04-08 18:41:53 +00003811 return Owned(Arg);
Douglas Gregor6ae5e662009-02-10 23:36:10 +00003812 }
Douglas Gregora35284b2009-02-11 00:19:33 +00003813
John McCall6bb80172010-03-30 21:47:33 +00003814 DeclAccessPair FoundResult; // temporary for ResolveOverloadedFunction
3815
Douglas Gregorb7a09262010-04-01 18:32:35 +00003816 // C++0x [temp.arg.nontype]p5 bullets 2, 4 and 6 permit conversion
3817 // from a template argument of type std::nullptr_t to a non-type
3818 // template parameter of type pointer to object, pointer to
3819 // function, or pointer-to-member, respectively.
Douglas Gregor84ee2ee2011-05-21 23:15:46 +00003820 if (ArgType->isNullPtrType()) {
3821 if (ParamType->isPointerType() || ParamType->isMemberPointerType()) {
3822 Converted = TemplateArgument((NamedDecl *)0);
3823 return Owned(Arg);
3824 }
3825
3826 if (ParamType->isNullPtrType()) {
3827 llvm::APSInt Zero(Context.getTypeSize(Context.NullPtrTy), true);
3828 Converted = TemplateArgument(Zero, Context.NullPtrTy);
3829 return Owned(Arg);
3830 }
Douglas Gregorb7a09262010-04-01 18:32:35 +00003831 }
3832
Douglas Gregorb86b0572009-02-11 01:18:59 +00003833 // Handle pointer-to-function, reference-to-function, and
3834 // pointer-to-member-function all in (roughly) the same way.
3835 if (// -- For a non-type template-parameter of type pointer to
3836 // function, only the function-to-pointer conversion (4.3) is
3837 // applied. If the template-argument represents a set of
3838 // overloaded functions (or a pointer to such), the matching
3839 // function is selected from the set (13.4).
3840 (ParamType->isPointerType() &&
Ted Kremenek6217b802009-07-29 21:53:49 +00003841 ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType()) ||
Douglas Gregorb86b0572009-02-11 01:18:59 +00003842 // -- For a non-type template-parameter of type reference to
3843 // function, no conversions apply. If the template-argument
3844 // represents a set of overloaded functions, the matching
3845 // function is selected from the set (13.4).
3846 (ParamType->isReferenceType() &&
Ted Kremenek6217b802009-07-29 21:53:49 +00003847 ParamType->getAs<ReferenceType>()->getPointeeType()->isFunctionType()) ||
Douglas Gregorb86b0572009-02-11 01:18:59 +00003848 // -- For a non-type template-parameter of type pointer to
3849 // member function, no conversions apply. If the
3850 // template-argument represents a set of overloaded member
3851 // functions, the matching member function is selected from
3852 // the set (13.4).
3853 (ParamType->isMemberPointerType() &&
Ted Kremenek6217b802009-07-29 21:53:49 +00003854 ParamType->getAs<MemberPointerType>()->getPointeeType()
Douglas Gregorb86b0572009-02-11 01:18:59 +00003855 ->isFunctionType())) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00003856
Douglas Gregor1a8cf732010-04-14 23:11:21 +00003857 if (Arg->getType() == Context.OverloadTy) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003858 if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg, ParamType,
Douglas Gregor1a8cf732010-04-14 23:11:21 +00003859 true,
3860 FoundResult)) {
3861 if (DiagnoseUseOfDecl(Fn, Arg->getSourceRange().getBegin()))
John Wiegley429bb272011-04-08 18:41:53 +00003862 return ExprError();
Douglas Gregor1a8cf732010-04-14 23:11:21 +00003863
3864 Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn);
3865 ArgType = Arg->getType();
3866 } else
John Wiegley429bb272011-04-08 18:41:53 +00003867 return ExprError();
Douglas Gregora35284b2009-02-11 00:19:33 +00003868 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003869
John Wiegley429bb272011-04-08 18:41:53 +00003870 if (!ParamType->isMemberPointerType()) {
3871 if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param,
3872 ParamType,
3873 Arg, Converted))
3874 return ExprError();
3875 return Owned(Arg);
3876 }
Douglas Gregorb7a09262010-04-01 18:32:35 +00003877
Douglas Gregor14d0aee2011-01-27 00:58:17 +00003878 if (IsQualificationConversion(ArgType, ParamType.getNonReferenceType(),
3879 false)) {
John Wiegley429bb272011-04-08 18:41:53 +00003880 Arg = ImpCastExprToType(Arg, ParamType, CK_NoOp, CastCategory(Arg)).take();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003881 } else if (!Context.hasSameUnqualifiedType(ArgType,
3882 ParamType.getNonReferenceType())) {
Douglas Gregora35284b2009-02-11 00:19:33 +00003883 // We can't perform this conversion.
Mike Stump1eb44332009-09-09 15:08:12 +00003884 Diag(Arg->getSourceRange().getBegin(),
Douglas Gregora35284b2009-02-11 00:19:33 +00003885 diag::err_template_arg_not_convertible)
Douglas Gregor2943aed2009-03-03 04:44:36 +00003886 << Arg->getType() << InstantiatedParamType << Arg->getSourceRange();
Douglas Gregora35284b2009-02-11 00:19:33 +00003887 Diag(Param->getLocation(), diag::note_template_param_here);
John Wiegley429bb272011-04-08 18:41:53 +00003888 return ExprError();
Douglas Gregora35284b2009-02-11 00:19:33 +00003889 }
Mike Stump1eb44332009-09-09 15:08:12 +00003890
John Wiegley429bb272011-04-08 18:41:53 +00003891 if (CheckTemplateArgumentPointerToMember(Arg, Converted))
3892 return ExprError();
3893 return Owned(Arg);
Douglas Gregora35284b2009-02-11 00:19:33 +00003894 }
3895
Chris Lattnerfe90de72009-02-20 21:37:53 +00003896 if (ParamType->isPointerType()) {
Douglas Gregorb86b0572009-02-11 01:18:59 +00003897 // -- for a non-type template-parameter of type pointer to
3898 // object, qualification conversions (4.4) and the
3899 // array-to-pointer conversion (4.2) are applied.
Sebastian Redl6e8ed162009-05-10 18:38:11 +00003900 // C++0x also allows a value of std::nullptr_t.
Eli Friedman13578692010-08-05 02:49:48 +00003901 assert(ParamType->getPointeeType()->isIncompleteOrObjectType() &&
Douglas Gregorb86b0572009-02-11 01:18:59 +00003902 "Only object pointers allowed here");
Douglas Gregorf684e6e2009-02-11 00:44:29 +00003903
John Wiegley429bb272011-04-08 18:41:53 +00003904 if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param,
3905 ParamType,
3906 Arg, Converted))
3907 return ExprError();
3908 return Owned(Arg);
Douglas Gregorf684e6e2009-02-11 00:44:29 +00003909 }
Mike Stump1eb44332009-09-09 15:08:12 +00003910
Ted Kremenek6217b802009-07-29 21:53:49 +00003911 if (const ReferenceType *ParamRefType = ParamType->getAs<ReferenceType>()) {
Douglas Gregorb86b0572009-02-11 01:18:59 +00003912 // -- For a non-type template-parameter of type reference to
3913 // object, no conversions apply. The type referred to by the
3914 // reference may be more cv-qualified than the (otherwise
3915 // identical) type of the template-argument. The
3916 // template-parameter is bound directly to the
3917 // template-argument, which must be an lvalue.
Eli Friedman13578692010-08-05 02:49:48 +00003918 assert(ParamRefType->getPointeeType()->isIncompleteOrObjectType() &&
Douglas Gregorb86b0572009-02-11 01:18:59 +00003919 "Only object references allowed here");
Douglas Gregorf684e6e2009-02-11 00:44:29 +00003920
Douglas Gregor1a8cf732010-04-14 23:11:21 +00003921 if (Arg->getType() == Context.OverloadTy) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003922 if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg,
3923 ParamRefType->getPointeeType(),
Douglas Gregor1a8cf732010-04-14 23:11:21 +00003924 true,
3925 FoundResult)) {
3926 if (DiagnoseUseOfDecl(Fn, Arg->getSourceRange().getBegin()))
John Wiegley429bb272011-04-08 18:41:53 +00003927 return ExprError();
Douglas Gregor1a8cf732010-04-14 23:11:21 +00003928
3929 Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn);
3930 ArgType = Arg->getType();
3931 } else
John Wiegley429bb272011-04-08 18:41:53 +00003932 return ExprError();
Douglas Gregorb86b0572009-02-11 01:18:59 +00003933 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003934
John Wiegley429bb272011-04-08 18:41:53 +00003935 if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param,
3936 ParamType,
3937 Arg, Converted))
3938 return ExprError();
3939 return Owned(Arg);
Douglas Gregorb86b0572009-02-11 01:18:59 +00003940 }
Douglas Gregor658bbb52009-02-11 16:16:59 +00003941
3942 // -- For a non-type template-parameter of type pointer to data
3943 // member, qualification conversions (4.4) are applied.
3944 assert(ParamType->isMemberPointerType() && "Only pointers to members remain");
3945
Douglas Gregor8e6563b2009-02-11 18:22:40 +00003946 if (Context.hasSameUnqualifiedType(ParamType, ArgType)) {
Douglas Gregor658bbb52009-02-11 16:16:59 +00003947 // Types match exactly: nothing more to do here.
Douglas Gregor14d0aee2011-01-27 00:58:17 +00003948 } else if (IsQualificationConversion(ArgType, ParamType, false)) {
John Wiegley429bb272011-04-08 18:41:53 +00003949 Arg = ImpCastExprToType(Arg, ParamType, CK_NoOp, CastCategory(Arg)).take();
Douglas Gregor658bbb52009-02-11 16:16:59 +00003950 } else {
3951 // We can't perform this conversion.
Mike Stump1eb44332009-09-09 15:08:12 +00003952 Diag(Arg->getSourceRange().getBegin(),
Douglas Gregor658bbb52009-02-11 16:16:59 +00003953 diag::err_template_arg_not_convertible)
Douglas Gregor2943aed2009-03-03 04:44:36 +00003954 << Arg->getType() << InstantiatedParamType << Arg->getSourceRange();
Douglas Gregor658bbb52009-02-11 16:16:59 +00003955 Diag(Param->getLocation(), diag::note_template_param_here);
John Wiegley429bb272011-04-08 18:41:53 +00003956 return ExprError();
Douglas Gregor658bbb52009-02-11 16:16:59 +00003957 }
3958
John Wiegley429bb272011-04-08 18:41:53 +00003959 if (CheckTemplateArgumentPointerToMember(Arg, Converted))
3960 return ExprError();
3961 return Owned(Arg);
Douglas Gregorc15cb382009-02-09 23:23:08 +00003962}
3963
3964/// \brief Check a template argument against its corresponding
3965/// template template parameter.
3966///
3967/// This routine implements the semantics of C++ [temp.arg.template].
3968/// It returns true if an error occurred, and false otherwise.
3969bool Sema::CheckTemplateArgument(TemplateTemplateParmDecl *Param,
Douglas Gregor788cd062009-11-11 01:00:40 +00003970 const TemplateArgumentLoc &Arg) {
3971 TemplateName Name = Arg.getArgument().getAsTemplate();
3972 TemplateDecl *Template = Name.getAsTemplateDecl();
3973 if (!Template) {
3974 // Any dependent template name is fine.
3975 assert(Name.isDependent() && "Non-dependent template isn't a declaration?");
3976 return false;
3977 }
Douglas Gregordd0574e2009-02-10 00:24:35 +00003978
Richard Smith3e4c6c42011-05-05 21:57:07 +00003979 // C++0x [temp.arg.template]p1:
Douglas Gregordd0574e2009-02-10 00:24:35 +00003980 // A template-argument for a template template-parameter shall be
Richard Smith3e4c6c42011-05-05 21:57:07 +00003981 // the name of a class template or an alias template, expressed as an
3982 // id-expression. When the template-argument names a class template, only
Douglas Gregordd0574e2009-02-10 00:24:35 +00003983 // primary class templates are considered when matching the
3984 // template template argument with the corresponding parameter;
3985 // partial specializations are not considered even if their
3986 // parameter lists match that of the template template parameter.
Douglas Gregorba1ecb52009-06-12 19:43:02 +00003987 //
3988 // Note that we also allow template template parameters here, which
3989 // will happen when we are dealing with, e.g., class template
3990 // partial specializations.
Mike Stump1eb44332009-09-09 15:08:12 +00003991 if (!isa<ClassTemplateDecl>(Template) &&
Richard Smith3e4c6c42011-05-05 21:57:07 +00003992 !isa<TemplateTemplateParmDecl>(Template) &&
3993 !isa<TypeAliasTemplateDecl>(Template)) {
Mike Stump1eb44332009-09-09 15:08:12 +00003994 assert(isa<FunctionTemplateDecl>(Template) &&
Douglas Gregordd0574e2009-02-10 00:24:35 +00003995 "Only function templates are possible here");
Douglas Gregor788cd062009-11-11 01:00:40 +00003996 Diag(Arg.getLocation(), diag::err_template_arg_not_class_template);
Douglas Gregore53060f2009-06-25 22:08:12 +00003997 Diag(Template->getLocation(), diag::note_template_arg_refers_here_func)
Douglas Gregordd0574e2009-02-10 00:24:35 +00003998 << Template;
3999 }
4000
4001 return !TemplateParameterListsAreEqual(Template->getTemplateParameters(),
4002 Param->getTemplateParameters(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004003 true,
Douglas Gregorfb898e12009-11-12 16:20:59 +00004004 TPL_TemplateTemplateArgumentMatch,
Douglas Gregor788cd062009-11-11 01:00:40 +00004005 Arg.getLocation());
Douglas Gregorc15cb382009-02-09 23:23:08 +00004006}
4007
Douglas Gregor02024a92010-03-28 02:42:43 +00004008/// \brief Given a non-type template argument that refers to a
4009/// declaration and the type of its corresponding non-type template
4010/// parameter, produce an expression that properly refers to that
4011/// declaration.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004012ExprResult
Douglas Gregor02024a92010-03-28 02:42:43 +00004013Sema::BuildExpressionFromDeclTemplateArgument(const TemplateArgument &Arg,
4014 QualType ParamType,
4015 SourceLocation Loc) {
4016 assert(Arg.getKind() == TemplateArgument::Declaration &&
4017 "Only declaration template arguments permitted here");
4018 ValueDecl *VD = cast<ValueDecl>(Arg.getAsDecl());
4019
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004020 if (VD->getDeclContext()->isRecord() &&
Douglas Gregor02024a92010-03-28 02:42:43 +00004021 (isa<CXXMethodDecl>(VD) || isa<FieldDecl>(VD))) {
4022 // If the value is a class member, we might have a pointer-to-member.
4023 // Determine whether the non-type template template parameter is of
4024 // pointer-to-member type. If so, we need to build an appropriate
4025 // expression for a pointer-to-member, since a "normal" DeclRefExpr
4026 // would refer to the member itself.
4027 if (ParamType->isMemberPointerType()) {
4028 QualType ClassType
4029 = Context.getTypeDeclType(cast<RecordDecl>(VD->getDeclContext()));
4030 NestedNameSpecifier *Qualifier
John McCall9ae2f072010-08-23 23:25:46 +00004031 = NestedNameSpecifier::Create(Context, 0, false,
4032 ClassType.getTypePtr());
Douglas Gregor02024a92010-03-28 02:42:43 +00004033 CXXScopeSpec SS;
Douglas Gregorc34348a2011-02-24 17:54:50 +00004034 SS.MakeTrivial(Context, Qualifier, Loc);
John McCalldfa1edb2010-11-23 20:48:44 +00004035
4036 // The actual value-ness of this is unimportant, but for
4037 // internal consistency's sake, references to instance methods
4038 // are r-values.
4039 ExprValueKind VK = VK_LValue;
4040 if (isa<CXXMethodDecl>(VD) && cast<CXXMethodDecl>(VD)->isInstance())
4041 VK = VK_RValue;
4042
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004043 ExprResult RefExpr = BuildDeclRefExpr(VD,
John McCallf89e55a2010-11-18 06:31:45 +00004044 VD->getType().getNonReferenceType(),
John McCalldfa1edb2010-11-23 20:48:44 +00004045 VK,
John McCallf89e55a2010-11-18 06:31:45 +00004046 Loc,
4047 &SS);
Douglas Gregor02024a92010-03-28 02:42:43 +00004048 if (RefExpr.isInvalid())
4049 return ExprError();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004050
John McCall2de56d12010-08-25 11:45:40 +00004051 RefExpr = CreateBuiltinUnaryOp(Loc, UO_AddrOf, RefExpr.get());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004052
Douglas Gregorc0c83002010-04-30 21:46:38 +00004053 // We might need to perform a trailing qualification conversion, since
4054 // the element type on the parameter could be more qualified than the
4055 // element type in the expression we constructed.
4056 if (IsQualificationConversion(((Expr*) RefExpr.get())->getType(),
John Wiegley429bb272011-04-08 18:41:53 +00004057 ParamType.getUnqualifiedType(), false))
4058 RefExpr = ImpCastExprToType(RefExpr.take(), ParamType.getUnqualifiedType(), CK_NoOp);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004059
Douglas Gregor02024a92010-03-28 02:42:43 +00004060 assert(!RefExpr.isInvalid() &&
4061 Context.hasSameType(((Expr*) RefExpr.get())->getType(),
Douglas Gregorc0c83002010-04-30 21:46:38 +00004062 ParamType.getUnqualifiedType()));
Douglas Gregor02024a92010-03-28 02:42:43 +00004063 return move(RefExpr);
4064 }
4065 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004066
Douglas Gregor02024a92010-03-28 02:42:43 +00004067 QualType T = VD->getType().getNonReferenceType();
4068 if (ParamType->isPointerType()) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00004069 // When the non-type template parameter is a pointer, take the
4070 // address of the declaration.
John McCallf89e55a2010-11-18 06:31:45 +00004071 ExprResult RefExpr = BuildDeclRefExpr(VD, T, VK_LValue, Loc);
Douglas Gregor02024a92010-03-28 02:42:43 +00004072 if (RefExpr.isInvalid())
4073 return ExprError();
Douglas Gregorb7a09262010-04-01 18:32:35 +00004074
4075 if (T->isFunctionType() || T->isArrayType()) {
4076 // Decay functions and arrays.
John Wiegley429bb272011-04-08 18:41:53 +00004077 RefExpr = DefaultFunctionArrayConversion(RefExpr.take());
4078 if (RefExpr.isInvalid())
4079 return ExprError();
Douglas Gregorb7a09262010-04-01 18:32:35 +00004080
4081 return move(RefExpr);
Douglas Gregor02024a92010-03-28 02:42:43 +00004082 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004083
Douglas Gregorb7a09262010-04-01 18:32:35 +00004084 // Take the address of everything else
John McCall2de56d12010-08-25 11:45:40 +00004085 return CreateBuiltinUnaryOp(Loc, UO_AddrOf, RefExpr.get());
Douglas Gregor02024a92010-03-28 02:42:43 +00004086 }
4087
John McCallf89e55a2010-11-18 06:31:45 +00004088 ExprValueKind VK = VK_RValue;
4089
Douglas Gregor02024a92010-03-28 02:42:43 +00004090 // If the non-type template parameter has reference type, qualify the
4091 // resulting declaration reference with the extra qualifiers on the
4092 // type that the reference refers to.
John McCallf89e55a2010-11-18 06:31:45 +00004093 if (const ReferenceType *TargetRef = ParamType->getAs<ReferenceType>()) {
4094 VK = VK_LValue;
4095 T = Context.getQualifiedType(T,
4096 TargetRef->getPointeeType().getQualifiers());
4097 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004098
John McCallf89e55a2010-11-18 06:31:45 +00004099 return BuildDeclRefExpr(VD, T, VK, Loc);
Douglas Gregor02024a92010-03-28 02:42:43 +00004100}
4101
4102/// \brief Construct a new expression that refers to the given
4103/// integral template argument with the given source-location
4104/// information.
4105///
4106/// This routine takes care of the mapping from an integral template
4107/// argument (which may have any integral type) to the appropriate
4108/// literal value.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004109ExprResult
Douglas Gregor02024a92010-03-28 02:42:43 +00004110Sema::BuildExpressionFromIntegralTemplateArgument(const TemplateArgument &Arg,
4111 SourceLocation Loc) {
4112 assert(Arg.getKind() == TemplateArgument::Integral &&
Douglas Gregord3731192011-01-10 07:32:04 +00004113 "Operation is only valid for integral template arguments");
Douglas Gregor02024a92010-03-28 02:42:43 +00004114 QualType T = Arg.getIntegralType();
4115 if (T->isCharType() || T->isWideCharType())
4116 return Owned(new (Context) CharacterLiteral(
4117 Arg.getAsIntegral()->getZExtValue(),
Chris Lattner223de242011-04-25 20:37:58 +00004118 T->isWideCharType(), T, Loc));
Douglas Gregor02024a92010-03-28 02:42:43 +00004119 if (T->isBooleanType())
4120 return Owned(new (Context) CXXBoolLiteralExpr(
4121 Arg.getAsIntegral()->getBoolValue(),
Chris Lattner223de242011-04-25 20:37:58 +00004122 T, Loc));
Douglas Gregor02024a92010-03-28 02:42:43 +00004123
Douglas Gregor84ee2ee2011-05-21 23:15:46 +00004124 if (T->isNullPtrType())
4125 return Owned(new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc));
4126
Chris Lattner223de242011-04-25 20:37:58 +00004127 // If this is an enum type that we're instantiating, we need to use an integer
4128 // type the same size as the enumerator. We don't want to build an
4129 // IntegerLiteral with enum type.
Peter Collingbournefb7b3632010-12-15 15:06:14 +00004130 QualType BT;
4131 if (const EnumType *ET = T->getAs<EnumType>())
Chris Lattner223de242011-04-25 20:37:58 +00004132 BT = ET->getDecl()->getIntegerType();
Peter Collingbournefb7b3632010-12-15 15:06:14 +00004133 else
4134 BT = T;
4135
4136 Expr *E = IntegerLiteral::Create(Context, *Arg.getAsIntegral(), BT, Loc);
Douglas Gregor8f5667d2011-02-18 02:12:44 +00004137 if (T->isEnumeralType()) {
4138 // FIXME: This is a hack. We need a better way to handle substituted
4139 // non-type template parameters.
Chris Lattner223de242011-04-25 20:37:58 +00004140 E = CStyleCastExpr::Create(Context, T, VK_RValue, CK_IntegralCast, E, 0,
4141 Context.getTrivialTypeSourceInfo(T, Loc),
4142 Loc, Loc);
Douglas Gregor8f5667d2011-02-18 02:12:44 +00004143 }
4144
Peter Collingbournefb7b3632010-12-15 15:06:14 +00004145 return Owned(E);
Douglas Gregor02024a92010-03-28 02:42:43 +00004146}
4147
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004148/// \brief Match two template parameters within template parameter lists.
4149static bool MatchTemplateParameterKind(Sema &S, NamedDecl *New, NamedDecl *Old,
4150 bool Complain,
4151 Sema::TemplateParameterListEqualKind Kind,
4152 SourceLocation TemplateArgLoc) {
4153 // Check the actual kind (type, non-type, template).
4154 if (Old->getKind() != New->getKind()) {
4155 if (Complain) {
4156 unsigned NextDiag = diag::err_template_param_different_kind;
4157 if (TemplateArgLoc.isValid()) {
4158 S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch);
4159 NextDiag = diag::note_template_param_different_kind;
4160 }
4161 S.Diag(New->getLocation(), NextDiag)
4162 << (Kind != Sema::TPL_TemplateMatch);
4163 S.Diag(Old->getLocation(), diag::note_template_prev_declaration)
4164 << (Kind != Sema::TPL_TemplateMatch);
4165 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004166
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004167 return false;
4168 }
4169
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004170 // Check that both are parameter packs are neither are parameter packs.
4171 // However, if we are matching a template template argument to a
Douglas Gregora0347822011-01-13 00:08:50 +00004172 // template template parameter, the template template parameter can have
4173 // a parameter pack where the template template argument does not.
4174 if (Old->isTemplateParameterPack() != New->isTemplateParameterPack() &&
4175 !(Kind == Sema::TPL_TemplateTemplateArgumentMatch &&
4176 Old->isTemplateParameterPack())) {
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004177 if (Complain) {
4178 unsigned NextDiag = diag::err_template_parameter_pack_non_pack;
4179 if (TemplateArgLoc.isValid()) {
4180 S.Diag(TemplateArgLoc,
4181 diag::err_template_arg_template_params_mismatch);
4182 NextDiag = diag::note_template_parameter_pack_non_pack;
4183 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004184
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004185 unsigned ParamKind = isa<TemplateTypeParmDecl>(New)? 0
4186 : isa<NonTypeTemplateParmDecl>(New)? 1
4187 : 2;
4188 S.Diag(New->getLocation(), NextDiag)
4189 << ParamKind << New->isParameterPack();
4190 S.Diag(Old->getLocation(), diag::note_template_parameter_pack_here)
4191 << ParamKind << Old->isParameterPack();
4192 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004193
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004194 return false;
4195 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004196
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004197 // For non-type template parameters, check the type of the parameter.
4198 if (NonTypeTemplateParmDecl *OldNTTP
4199 = dyn_cast<NonTypeTemplateParmDecl>(Old)) {
4200 NonTypeTemplateParmDecl *NewNTTP = cast<NonTypeTemplateParmDecl>(New);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004201
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004202 // If we are matching a template template argument to a template
4203 // template parameter and one of the non-type template parameter types
4204 // is dependent, then we must wait until template instantiation time
4205 // to actually compare the arguments.
4206 if (Kind == Sema::TPL_TemplateTemplateArgumentMatch &&
4207 (OldNTTP->getType()->isDependentType() ||
4208 NewNTTP->getType()->isDependentType()))
4209 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004210
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004211 if (!S.Context.hasSameType(OldNTTP->getType(), NewNTTP->getType())) {
4212 if (Complain) {
4213 unsigned NextDiag = diag::err_template_nontype_parm_different_type;
4214 if (TemplateArgLoc.isValid()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004215 S.Diag(TemplateArgLoc,
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004216 diag::err_template_arg_template_params_mismatch);
4217 NextDiag = diag::note_template_nontype_parm_different_type;
4218 }
4219 S.Diag(NewNTTP->getLocation(), NextDiag)
4220 << NewNTTP->getType()
4221 << (Kind != Sema::TPL_TemplateMatch);
4222 S.Diag(OldNTTP->getLocation(),
4223 diag::note_template_nontype_parm_prev_declaration)
4224 << OldNTTP->getType();
4225 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004226
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004227 return false;
4228 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004229
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004230 return true;
4231 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004232
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004233 // For template template parameters, check the template parameter types.
4234 // The template parameter lists of template template
4235 // parameters must agree.
4236 if (TemplateTemplateParmDecl *OldTTP
4237 = dyn_cast<TemplateTemplateParmDecl>(Old)) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004238 TemplateTemplateParmDecl *NewTTP = cast<TemplateTemplateParmDecl>(New);
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004239 return S.TemplateParameterListsAreEqual(NewTTP->getTemplateParameters(),
4240 OldTTP->getTemplateParameters(),
4241 Complain,
4242 (Kind == Sema::TPL_TemplateMatch
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004243 ? Sema::TPL_TemplateTemplateParmMatch
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004244 : Kind),
4245 TemplateArgLoc);
4246 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004247
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004248 return true;
4249}
Douglas Gregor02024a92010-03-28 02:42:43 +00004250
Douglas Gregora0347822011-01-13 00:08:50 +00004251/// \brief Diagnose a known arity mismatch when comparing template argument
4252/// lists.
4253static
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004254void DiagnoseTemplateParameterListArityMismatch(Sema &S,
Douglas Gregora0347822011-01-13 00:08:50 +00004255 TemplateParameterList *New,
4256 TemplateParameterList *Old,
4257 Sema::TemplateParameterListEqualKind Kind,
4258 SourceLocation TemplateArgLoc) {
4259 unsigned NextDiag = diag::err_template_param_list_different_arity;
4260 if (TemplateArgLoc.isValid()) {
4261 S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch);
4262 NextDiag = diag::note_template_param_list_different_arity;
4263 }
4264 S.Diag(New->getTemplateLoc(), NextDiag)
4265 << (New->size() > Old->size())
4266 << (Kind != Sema::TPL_TemplateMatch)
4267 << SourceRange(New->getTemplateLoc(), New->getRAngleLoc());
4268 S.Diag(Old->getTemplateLoc(), diag::note_template_prev_declaration)
4269 << (Kind != Sema::TPL_TemplateMatch)
4270 << SourceRange(Old->getTemplateLoc(), Old->getRAngleLoc());
4271}
4272
Douglas Gregorddc29e12009-02-06 22:42:48 +00004273/// \brief Determine whether the given template parameter lists are
4274/// equivalent.
4275///
Mike Stump1eb44332009-09-09 15:08:12 +00004276/// \param New The new template parameter list, typically written in the
Douglas Gregorddc29e12009-02-06 22:42:48 +00004277/// source code as part of a new template declaration.
4278///
4279/// \param Old The old template parameter list, typically found via
4280/// name lookup of the template declared with this template parameter
4281/// list.
4282///
4283/// \param Complain If true, this routine will produce a diagnostic if
4284/// the template parameter lists are not equivalent.
4285///
Douglas Gregorfb898e12009-11-12 16:20:59 +00004286/// \param Kind describes how we are to match the template parameter lists.
Douglas Gregordd0574e2009-02-10 00:24:35 +00004287///
4288/// \param TemplateArgLoc If this source location is valid, then we
4289/// are actually checking the template parameter list of a template
4290/// argument (New) against the template parameter list of its
4291/// corresponding template template parameter (Old). We produce
4292/// slightly different diagnostics in this scenario.
4293///
Douglas Gregorddc29e12009-02-06 22:42:48 +00004294/// \returns True if the template parameter lists are equal, false
4295/// otherwise.
Mike Stump1eb44332009-09-09 15:08:12 +00004296bool
Douglas Gregorddc29e12009-02-06 22:42:48 +00004297Sema::TemplateParameterListsAreEqual(TemplateParameterList *New,
4298 TemplateParameterList *Old,
4299 bool Complain,
Douglas Gregorfb898e12009-11-12 16:20:59 +00004300 TemplateParameterListEqualKind Kind,
Douglas Gregordd0574e2009-02-10 00:24:35 +00004301 SourceLocation TemplateArgLoc) {
Douglas Gregora0347822011-01-13 00:08:50 +00004302 if (Old->size() != New->size() && Kind != TPL_TemplateTemplateArgumentMatch) {
4303 if (Complain)
4304 DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind,
4305 TemplateArgLoc);
Douglas Gregorddc29e12009-02-06 22:42:48 +00004306
4307 return false;
4308 }
4309
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004310 // C++0x [temp.arg.template]p3:
4311 // A template-argument matches a template template-parameter (call it P)
NAKAMURA Takumi00995302011-01-27 07:09:49 +00004312 // when each of the template parameters in the template-parameter-list of
Richard Smith3e4c6c42011-05-05 21:57:07 +00004313 // the template-argument's corresponding class template or alias template
NAKAMURA Takumi00995302011-01-27 07:09:49 +00004314 // (call it A) matches the corresponding template parameter in the
Douglas Gregora0347822011-01-13 00:08:50 +00004315 // template-parameter-list of P. [...]
4316 TemplateParameterList::iterator NewParm = New->begin();
4317 TemplateParameterList::iterator NewParmEnd = New->end();
Douglas Gregorddc29e12009-02-06 22:42:48 +00004318 for (TemplateParameterList::iterator OldParm = Old->begin(),
Douglas Gregora0347822011-01-13 00:08:50 +00004319 OldParmEnd = Old->end();
4320 OldParm != OldParmEnd; ++OldParm) {
Douglas Gregorc421f542011-01-13 18:47:47 +00004321 if (Kind != TPL_TemplateTemplateArgumentMatch ||
4322 !(*OldParm)->isTemplateParameterPack()) {
Douglas Gregora0347822011-01-13 00:08:50 +00004323 if (NewParm == NewParmEnd) {
4324 if (Complain)
4325 DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind,
4326 TemplateArgLoc);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004327
Douglas Gregora0347822011-01-13 00:08:50 +00004328 return false;
4329 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004330
Douglas Gregora0347822011-01-13 00:08:50 +00004331 if (!MatchTemplateParameterKind(*this, *NewParm, *OldParm, Complain,
4332 Kind, TemplateArgLoc))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004333 return false;
4334
Douglas Gregora0347822011-01-13 00:08:50 +00004335 ++NewParm;
4336 continue;
4337 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004338
Douglas Gregora0347822011-01-13 00:08:50 +00004339 // C++0x [temp.arg.template]p3:
NAKAMURA Takumi00995302011-01-27 07:09:49 +00004340 // [...] When P's template- parameter-list contains a template parameter
4341 // pack (14.5.3), the template parameter pack will match zero or more
4342 // template parameters or template parameter packs in the
Douglas Gregora0347822011-01-13 00:08:50 +00004343 // template-parameter-list of A with the same type and form as the
4344 // template parameter pack in P (ignoring whether those template
4345 // parameters are template parameter packs).
4346 for (; NewParm != NewParmEnd; ++NewParm) {
4347 if (!MatchTemplateParameterKind(*this, *NewParm, *OldParm, Complain,
4348 Kind, TemplateArgLoc))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004349 return false;
Douglas Gregora0347822011-01-13 00:08:50 +00004350 }
Douglas Gregorddc29e12009-02-06 22:42:48 +00004351 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004352
Douglas Gregora0347822011-01-13 00:08:50 +00004353 // Make sure we exhausted all of the arguments.
4354 if (NewParm != NewParmEnd) {
4355 if (Complain)
4356 DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind,
4357 TemplateArgLoc);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004358
Douglas Gregora0347822011-01-13 00:08:50 +00004359 return false;
4360 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004361
Douglas Gregorddc29e12009-02-06 22:42:48 +00004362 return true;
4363}
4364
4365/// \brief Check whether a template can be declared within this scope.
4366///
4367/// If the template declaration is valid in this scope, returns
4368/// false. Otherwise, issues a diagnostic and returns true.
Mike Stump1eb44332009-09-09 15:08:12 +00004369bool
Douglas Gregor05396e22009-08-25 17:23:04 +00004370Sema::CheckTemplateDeclScope(Scope *S, TemplateParameterList *TemplateParams) {
Douglas Gregorddc29e12009-02-06 22:42:48 +00004371 // Find the nearest enclosing declaration scope.
4372 while ((S->getFlags() & Scope::DeclScope) == 0 ||
4373 (S->getFlags() & Scope::TemplateParamScope) != 0)
4374 S = S->getParent();
Mike Stump1eb44332009-09-09 15:08:12 +00004375
Douglas Gregorddc29e12009-02-06 22:42:48 +00004376 // C++ [temp]p2:
4377 // A template-declaration can appear only as a namespace scope or
4378 // class scope declaration.
4379 DeclContext *Ctx = static_cast<DeclContext *>(S->getEntity());
Eli Friedman1503f772009-07-31 01:43:05 +00004380 if (Ctx && isa<LinkageSpecDecl>(Ctx) &&
4381 cast<LinkageSpecDecl>(Ctx)->getLanguage() != LinkageSpecDecl::lang_cxx)
Mike Stump1eb44332009-09-09 15:08:12 +00004382 return Diag(TemplateParams->getTemplateLoc(), diag::err_template_linkage)
Douglas Gregor05396e22009-08-25 17:23:04 +00004383 << TemplateParams->getSourceRange();
Mike Stump1eb44332009-09-09 15:08:12 +00004384
Eli Friedman1503f772009-07-31 01:43:05 +00004385 while (Ctx && isa<LinkageSpecDecl>(Ctx))
Douglas Gregorddc29e12009-02-06 22:42:48 +00004386 Ctx = Ctx->getParent();
Douglas Gregorddc29e12009-02-06 22:42:48 +00004387
4388 if (Ctx && (Ctx->isFileContext() || Ctx->isRecord()))
4389 return false;
4390
Mike Stump1eb44332009-09-09 15:08:12 +00004391 return Diag(TemplateParams->getTemplateLoc(),
Douglas Gregor05396e22009-08-25 17:23:04 +00004392 diag::err_template_outside_namespace_or_class_scope)
4393 << TemplateParams->getSourceRange();
Douglas Gregorddc29e12009-02-06 22:42:48 +00004394}
Douglas Gregorcc636682009-02-17 23:15:12 +00004395
Douglas Gregord5cb8762009-10-07 00:13:32 +00004396/// \brief Determine what kind of template specialization the given declaration
4397/// is.
4398static TemplateSpecializationKind getTemplateSpecializationKind(NamedDecl *D) {
4399 if (!D)
4400 return TSK_Undeclared;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004401
Douglas Gregorf6b11852009-10-08 15:14:33 +00004402 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D))
4403 return Record->getTemplateSpecializationKind();
Douglas Gregord5cb8762009-10-07 00:13:32 +00004404 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D))
4405 return Function->getTemplateSpecializationKind();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00004406 if (VarDecl *Var = dyn_cast<VarDecl>(D))
4407 return Var->getTemplateSpecializationKind();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004408
Douglas Gregord5cb8762009-10-07 00:13:32 +00004409 return TSK_Undeclared;
4410}
4411
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004412/// \brief Check whether a specialization is well-formed in the current
Douglas Gregor9302da62009-10-14 23:50:59 +00004413/// context.
Douglas Gregor88b70942009-02-25 22:02:03 +00004414///
Douglas Gregor9302da62009-10-14 23:50:59 +00004415/// This routine determines whether a template specialization can be declared
4416/// in the current context (C++ [temp.expl.spec]p2).
Douglas Gregord5cb8762009-10-07 00:13:32 +00004417///
4418/// \param S the semantic analysis object for which this check is being
4419/// performed.
4420///
4421/// \param Specialized the entity being specialized or instantiated, which
4422/// may be a kind of template (class template, function template, etc.) or
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004423/// a member of a class template (member function, static data member,
Douglas Gregord5cb8762009-10-07 00:13:32 +00004424/// member class).
4425///
4426/// \param PrevDecl the previous declaration of this entity, if any.
4427///
4428/// \param Loc the location of the explicit specialization or instantiation of
4429/// this entity.
4430///
4431/// \param IsPartialSpecialization whether this is a partial specialization of
4432/// a class template.
4433///
Douglas Gregord5cb8762009-10-07 00:13:32 +00004434/// \returns true if there was an error that we cannot recover from, false
4435/// otherwise.
4436static bool CheckTemplateSpecializationScope(Sema &S,
4437 NamedDecl *Specialized,
4438 NamedDecl *PrevDecl,
4439 SourceLocation Loc,
Douglas Gregor9302da62009-10-14 23:50:59 +00004440 bool IsPartialSpecialization) {
Douglas Gregord5cb8762009-10-07 00:13:32 +00004441 // Keep these "kind" numbers in sync with the %select statements in the
4442 // various diagnostics emitted by this routine.
4443 int EntityKind = 0;
Ted Kremenekfe62b062011-01-14 22:31:36 +00004444 if (isa<ClassTemplateDecl>(Specialized))
Douglas Gregord5cb8762009-10-07 00:13:32 +00004445 EntityKind = IsPartialSpecialization? 1 : 0;
Ted Kremenekfe62b062011-01-14 22:31:36 +00004446 else if (isa<FunctionTemplateDecl>(Specialized))
Douglas Gregord5cb8762009-10-07 00:13:32 +00004447 EntityKind = 2;
Ted Kremenekfe62b062011-01-14 22:31:36 +00004448 else if (isa<CXXMethodDecl>(Specialized))
Douglas Gregord5cb8762009-10-07 00:13:32 +00004449 EntityKind = 3;
4450 else if (isa<VarDecl>(Specialized))
4451 EntityKind = 4;
4452 else if (isa<RecordDecl>(Specialized))
4453 EntityKind = 5;
4454 else {
Douglas Gregor9302da62009-10-14 23:50:59 +00004455 S.Diag(Loc, diag::err_template_spec_unknown_kind);
4456 S.Diag(Specialized->getLocation(), diag::note_specialized_entity);
Douglas Gregord5cb8762009-10-07 00:13:32 +00004457 return true;
4458 }
4459
Douglas Gregor88b70942009-02-25 22:02:03 +00004460 // C++ [temp.expl.spec]p2:
4461 // An explicit specialization shall be declared in the namespace
4462 // of which the template is a member, or, for member templates, in
4463 // the namespace of which the enclosing class or enclosing class
4464 // template is a member. An explicit specialization of a member
4465 // function, member class or static data member of a class
4466 // template shall be declared in the namespace of which the class
4467 // template is a member. Such a declaration may also be a
4468 // definition. If the declaration is not a definition, the
4469 // specialization may be defined later in the name- space in which
4470 // the explicit specialization was declared, or in a namespace
4471 // that encloses the one in which the explicit specialization was
4472 // declared.
Sebastian Redl7a126a42010-08-31 00:36:30 +00004473 if (S.CurContext->getRedeclContext()->isFunctionOrMethod()) {
Douglas Gregord5cb8762009-10-07 00:13:32 +00004474 S.Diag(Loc, diag::err_template_spec_decl_function_scope)
Douglas Gregor9302da62009-10-14 23:50:59 +00004475 << Specialized;
Douglas Gregor88b70942009-02-25 22:02:03 +00004476 return true;
4477 }
Douglas Gregor7974c3b2009-10-07 17:21:34 +00004478
Douglas Gregor0a407472009-10-07 17:30:37 +00004479 if (S.CurContext->isRecord() && !IsPartialSpecialization) {
Francois Pichete1e96a62011-05-14 19:17:07 +00004480 S.Diag(Loc, diag::err_template_spec_decl_class_scope)
4481 << Specialized;
4482 return true;
Douglas Gregor0a407472009-10-07 17:30:37 +00004483 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004484
Douglas Gregor7974c3b2009-10-07 17:21:34 +00004485 // C++ [temp.class.spec]p6:
4486 // A class template partial specialization may be declared or redeclared
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004487 // in any namespace scope in which its definition may be defined (14.5.1
4488 // and 14.5.2).
Douglas Gregord5cb8762009-10-07 00:13:32 +00004489 bool ComplainedAboutScope = false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004490 DeclContext *SpecializedContext
Douglas Gregord5cb8762009-10-07 00:13:32 +00004491 = Specialized->getDeclContext()->getEnclosingNamespaceContext();
Douglas Gregor7974c3b2009-10-07 17:21:34 +00004492 DeclContext *DC = S.CurContext->getEnclosingNamespaceContext();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004493 if ((!PrevDecl ||
Douglas Gregor9302da62009-10-14 23:50:59 +00004494 getTemplateSpecializationKind(PrevDecl) == TSK_Undeclared ||
4495 getTemplateSpecializationKind(PrevDecl) == TSK_ImplicitInstantiation)){
Douglas Gregor121dc9a2010-09-12 05:08:28 +00004496 // C++ [temp.exp.spec]p2:
4497 // An explicit specialization shall be declared in the namespace of which
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004498 // the template is a member, or, for member templates, in the namespace
Douglas Gregor121dc9a2010-09-12 05:08:28 +00004499 // of which the enclosing class or enclosing class template is a member.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004500 // An explicit specialization of a member function, member class or
4501 // static data member of a class template shall be declared in the
Douglas Gregor121dc9a2010-09-12 05:08:28 +00004502 // namespace of which the class template is a member.
4503 //
4504 // C++0x [temp.expl.spec]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004505 // An explicit specialization shall be declared in a namespace enclosing
Douglas Gregor121dc9a2010-09-12 05:08:28 +00004506 // the specialized template.
4507 if (!DC->InEnclosingNamespaceSetOf(SpecializedContext) &&
4508 !(S.getLangOptions().CPlusPlus0x && DC->Encloses(SpecializedContext))) {
Douglas Gregora4d5de52010-09-12 05:24:55 +00004509 bool IsCPlusPlus0xExtension
4510 = !S.getLangOptions().CPlusPlus0x && DC->Encloses(SpecializedContext);
Douglas Gregor9302da62009-10-14 23:50:59 +00004511 if (isa<TranslationUnitDecl>(SpecializedContext))
Douglas Gregora4d5de52010-09-12 05:24:55 +00004512 S.Diag(Loc, IsCPlusPlus0xExtension
4513 ? diag::ext_template_spec_decl_out_of_scope_global
4514 : diag::err_template_spec_decl_out_of_scope_global)
4515 << EntityKind << Specialized;
Douglas Gregor9302da62009-10-14 23:50:59 +00004516 else if (isa<NamespaceDecl>(SpecializedContext))
Douglas Gregora4d5de52010-09-12 05:24:55 +00004517 S.Diag(Loc, IsCPlusPlus0xExtension
4518 ? diag::ext_template_spec_decl_out_of_scope
4519 : diag::err_template_spec_decl_out_of_scope)
4520 << EntityKind << Specialized
4521 << cast<NamedDecl>(SpecializedContext);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004522
Douglas Gregor9302da62009-10-14 23:50:59 +00004523 S.Diag(Specialized->getLocation(), diag::note_specialized_entity);
4524 ComplainedAboutScope = true;
Douglas Gregor88b70942009-02-25 22:02:03 +00004525 }
Douglas Gregor88b70942009-02-25 22:02:03 +00004526 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004527
4528 // Make sure that this redeclaration (or definition) occurs in an enclosing
Douglas Gregor9302da62009-10-14 23:50:59 +00004529 // namespace.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004530 // Note that HandleDeclarator() performs this check for explicit
Douglas Gregord5cb8762009-10-07 00:13:32 +00004531 // specializations of function templates, static data members, and member
4532 // functions, so we skip the check here for those kinds of entities.
4533 // FIXME: HandleDeclarator's diagnostics aren't quite as good, though.
Douglas Gregor7974c3b2009-10-07 17:21:34 +00004534 // Should we refactor that check, so that it occurs later?
4535 if (!ComplainedAboutScope && !DC->Encloses(SpecializedContext) &&
Douglas Gregor9302da62009-10-14 23:50:59 +00004536 !(isa<FunctionTemplateDecl>(Specialized) || isa<VarDecl>(Specialized) ||
4537 isa<FunctionDecl>(Specialized))) {
Douglas Gregord5cb8762009-10-07 00:13:32 +00004538 if (isa<TranslationUnitDecl>(SpecializedContext))
4539 S.Diag(Loc, diag::err_template_spec_redecl_global_scope)
4540 << EntityKind << Specialized;
4541 else if (isa<NamespaceDecl>(SpecializedContext))
4542 S.Diag(Loc, diag::err_template_spec_redecl_out_of_scope)
4543 << EntityKind << Specialized
4544 << cast<NamedDecl>(SpecializedContext);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004545
Douglas Gregor9302da62009-10-14 23:50:59 +00004546 S.Diag(Specialized->getLocation(), diag::note_specialized_entity);
Douglas Gregor88b70942009-02-25 22:02:03 +00004547 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004548
Douglas Gregord5cb8762009-10-07 00:13:32 +00004549 // FIXME: check for specialization-after-instantiation errors and such.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004550
Douglas Gregor88b70942009-02-25 22:02:03 +00004551 return false;
4552}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004553
Douglas Gregorbacb9492011-01-03 21:13:47 +00004554/// \brief Subroutine of Sema::CheckClassTemplatePartialSpecializationArgs
4555/// that checks non-type template partial specialization arguments.
4556static bool CheckNonTypeClassTemplatePartialSpecializationArgs(Sema &S,
4557 NonTypeTemplateParmDecl *Param,
4558 const TemplateArgument *Args,
4559 unsigned NumArgs) {
4560 for (unsigned I = 0; I != NumArgs; ++I) {
4561 if (Args[I].getKind() == TemplateArgument::Pack) {
4562 if (CheckNonTypeClassTemplatePartialSpecializationArgs(S, Param,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004563 Args[I].pack_begin(),
Douglas Gregorbacb9492011-01-03 21:13:47 +00004564 Args[I].pack_size()))
4565 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004566
Douglas Gregore94866f2009-06-12 21:21:02 +00004567 continue;
Douglas Gregorbacb9492011-01-03 21:13:47 +00004568 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004569
Douglas Gregorbacb9492011-01-03 21:13:47 +00004570 Expr *ArgExpr = Args[I].getAsExpr();
Douglas Gregor6aa75cf2009-06-12 22:08:06 +00004571 if (!ArgExpr) {
Douglas Gregore94866f2009-06-12 21:21:02 +00004572 continue;
Douglas Gregor6aa75cf2009-06-12 22:08:06 +00004573 }
Douglas Gregore94866f2009-06-12 21:21:02 +00004574
Douglas Gregor7a21fd42011-01-03 21:37:45 +00004575 // We can have a pack expansion of any of the bullets below.
Douglas Gregorbacb9492011-01-03 21:13:47 +00004576 if (PackExpansionExpr *Expansion = dyn_cast<PackExpansionExpr>(ArgExpr))
4577 ArgExpr = Expansion->getPattern();
Douglas Gregor54c53cc2011-01-04 23:35:54 +00004578
4579 // Strip off any implicit casts we added as part of type checking.
4580 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr))
4581 ArgExpr = ICE->getSubExpr();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004582
Douglas Gregore94866f2009-06-12 21:21:02 +00004583 // C++ [temp.class.spec]p8:
4584 // A non-type argument is non-specialized if it is the name of a
4585 // non-type parameter. All other non-type arguments are
4586 // specialized.
4587 //
4588 // Below, we check the two conditions that only apply to
4589 // specialized non-type arguments, so skip any non-specialized
4590 // arguments.
4591 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ArgExpr))
Douglas Gregor54c53cc2011-01-04 23:35:54 +00004592 if (isa<NonTypeTemplateParmDecl>(DRE->getDecl()))
Douglas Gregore94866f2009-06-12 21:21:02 +00004593 continue;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004594
Douglas Gregore94866f2009-06-12 21:21:02 +00004595 // C++ [temp.class.spec]p9:
4596 // Within the argument list of a class template partial
4597 // specialization, the following restrictions apply:
4598 // -- A partially specialized non-type argument expression
4599 // shall not involve a template parameter of the partial
4600 // specialization except when the argument expression is a
4601 // simple identifier.
4602 if (ArgExpr->isTypeDependent() || ArgExpr->isValueDependent()) {
Douglas Gregorbacb9492011-01-03 21:13:47 +00004603 S.Diag(ArgExpr->getLocStart(),
Douglas Gregore94866f2009-06-12 21:21:02 +00004604 diag::err_dependent_non_type_arg_in_partial_spec)
4605 << ArgExpr->getSourceRange();
4606 return true;
4607 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004608
Douglas Gregore94866f2009-06-12 21:21:02 +00004609 // -- The type of a template parameter corresponding to a
4610 // specialized non-type argument shall not be dependent on a
4611 // parameter of the specialization.
4612 if (Param->getType()->isDependentType()) {
Douglas Gregorbacb9492011-01-03 21:13:47 +00004613 S.Diag(ArgExpr->getLocStart(),
Douglas Gregore94866f2009-06-12 21:21:02 +00004614 diag::err_dependent_typed_non_type_arg_in_partial_spec)
4615 << Param->getType()
4616 << ArgExpr->getSourceRange();
Douglas Gregorbacb9492011-01-03 21:13:47 +00004617 S.Diag(Param->getLocation(), diag::note_template_param_here);
Douglas Gregore94866f2009-06-12 21:21:02 +00004618 return true;
4619 }
4620 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004621
Douglas Gregorbacb9492011-01-03 21:13:47 +00004622 return false;
4623}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004624
Douglas Gregorbacb9492011-01-03 21:13:47 +00004625/// \brief Check the non-type template arguments of a class template
4626/// partial specialization according to C++ [temp.class.spec]p9.
4627///
4628/// \param TemplateParams the template parameters of the primary class
4629/// template.
4630///
4631/// \param TemplateArg the template arguments of the class template
4632/// partial specialization.
4633///
4634/// \returns true if there was an error, false otherwise.
4635static bool CheckClassTemplatePartialSpecializationArgs(Sema &S,
4636 TemplateParameterList *TemplateParams,
4637 llvm::SmallVectorImpl<TemplateArgument> &TemplateArgs) {
4638 const TemplateArgument *ArgList = TemplateArgs.data();
4639
4640 for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) {
4641 NonTypeTemplateParmDecl *Param
4642 = dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(I));
4643 if (!Param)
4644 continue;
4645
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004646 if (CheckNonTypeClassTemplatePartialSpecializationArgs(S, Param,
Douglas Gregorbacb9492011-01-03 21:13:47 +00004647 &ArgList[I], 1))
4648 return true;
4649 }
Douglas Gregore94866f2009-06-12 21:21:02 +00004650
4651 return false;
4652}
4653
Douglas Gregordc0a11c2010-02-26 06:03:23 +00004654/// \brief Retrieve the previous declaration of the given declaration.
4655static NamedDecl *getPreviousDecl(NamedDecl *ND) {
4656 if (VarDecl *VD = dyn_cast<VarDecl>(ND))
4657 return VD->getPreviousDeclaration();
4658 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND))
4659 return FD->getPreviousDeclaration();
4660 if (TagDecl *TD = dyn_cast<TagDecl>(ND))
4661 return TD->getPreviousDeclaration();
Richard Smith162e1c12011-04-15 14:24:37 +00004662 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(ND))
Douglas Gregordc0a11c2010-02-26 06:03:23 +00004663 return TD->getPreviousDeclaration();
4664 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND))
4665 return FTD->getPreviousDeclaration();
4666 if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(ND))
4667 return CTD->getPreviousDeclaration();
4668 return 0;
4669}
4670
John McCalld226f652010-08-21 09:40:31 +00004671DeclResult
John McCall0f434ec2009-07-31 02:45:11 +00004672Sema::ActOnClassTemplateSpecialization(Scope *S, unsigned TagSpec,
4673 TagUseKind TUK,
Mike Stump1eb44332009-09-09 15:08:12 +00004674 SourceLocation KWLoc,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00004675 CXXScopeSpec &SS,
Douglas Gregor7532dc62009-03-30 22:58:21 +00004676 TemplateTy TemplateD,
Douglas Gregorcc636682009-02-17 23:15:12 +00004677 SourceLocation TemplateNameLoc,
4678 SourceLocation LAngleLoc,
Douglas Gregor40808ce2009-03-09 23:48:35 +00004679 ASTTemplateArgsPtr TemplateArgsIn,
Douglas Gregorcc636682009-02-17 23:15:12 +00004680 SourceLocation RAngleLoc,
4681 AttributeList *Attr,
4682 MultiTemplateParamsArg TemplateParameterLists) {
Douglas Gregorfc9cd612009-09-26 20:57:03 +00004683 assert(TUK != TUK_Reference && "References are not specializations");
John McCallf1bbbb42009-09-04 01:14:41 +00004684
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00004685 // NOTE: KWLoc is the location of the tag keyword. This will instead
4686 // store the location of the outermost template keyword in the declaration.
4687 SourceLocation TemplateKWLoc = TemplateParameterLists.size() > 0
4688 ? TemplateParameterLists.get()[0]->getTemplateLoc() : SourceLocation();
4689
Douglas Gregorcc636682009-02-17 23:15:12 +00004690 // Find the class template we're specializing
Douglas Gregor7532dc62009-03-30 22:58:21 +00004691 TemplateName Name = TemplateD.getAsVal<TemplateName>();
Mike Stump1eb44332009-09-09 15:08:12 +00004692 ClassTemplateDecl *ClassTemplate
Douglas Gregor8b13c082009-11-12 00:46:20 +00004693 = dyn_cast_or_null<ClassTemplateDecl>(Name.getAsTemplateDecl());
4694
4695 if (!ClassTemplate) {
4696 Diag(TemplateNameLoc, diag::err_not_class_template_specialization)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004697 << (Name.getAsTemplateDecl() &&
Douglas Gregor8b13c082009-11-12 00:46:20 +00004698 isa<TemplateTemplateParmDecl>(Name.getAsTemplateDecl()));
4699 return true;
4700 }
Douglas Gregorcc636682009-02-17 23:15:12 +00004701
Douglas Gregor1fef4e62009-10-07 22:35:40 +00004702 bool isExplicitSpecialization = false;
Douglas Gregorc8ab2562009-05-31 09:31:02 +00004703 bool isPartialSpecialization = false;
4704
Douglas Gregor88b70942009-02-25 22:02:03 +00004705 // Check the validity of the template headers that introduce this
4706 // template.
Douglas Gregorfc9cd612009-09-26 20:57:03 +00004707 // FIXME: We probably shouldn't complain about these headers for
4708 // friend declarations.
Douglas Gregor0167f3c2010-07-14 23:14:12 +00004709 bool Invalid = false;
Douglas Gregor05396e22009-08-25 17:23:04 +00004710 TemplateParameterList *TemplateParams
Douglas Gregorc8406492011-05-10 18:27:06 +00004711 = MatchTemplateParametersToScopeSpecifier(TemplateNameLoc,
4712 TemplateNameLoc,
4713 SS,
Mike Stump1eb44332009-09-09 15:08:12 +00004714 (TemplateParameterList**)TemplateParameterLists.get(),
Douglas Gregor1fef4e62009-10-07 22:35:40 +00004715 TemplateParameterLists.size(),
John McCall77e8b112010-04-13 20:37:33 +00004716 TUK == TUK_Friend,
Douglas Gregor0167f3c2010-07-14 23:14:12 +00004717 isExplicitSpecialization,
4718 Invalid);
4719 if (Invalid)
4720 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004721
Douglas Gregor05396e22009-08-25 17:23:04 +00004722 if (TemplateParams && TemplateParams->size() > 0) {
4723 isPartialSpecialization = true;
Douglas Gregor88b70942009-02-25 22:02:03 +00004724
Douglas Gregorb0ee93c2010-12-21 08:14:57 +00004725 if (TUK == TUK_Friend) {
4726 Diag(KWLoc, diag::err_partial_specialization_friend)
4727 << SourceRange(LAngleLoc, RAngleLoc);
4728 return true;
4729 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004730
Douglas Gregor05396e22009-08-25 17:23:04 +00004731 // C++ [temp.class.spec]p10:
4732 // The template parameter list of a specialization shall not
4733 // contain default template argument values.
4734 for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) {
4735 Decl *Param = TemplateParams->getParam(I);
4736 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
4737 if (TTP->hasDefaultArgument()) {
Mike Stump1eb44332009-09-09 15:08:12 +00004738 Diag(TTP->getDefaultArgumentLoc(),
Douglas Gregor05396e22009-08-25 17:23:04 +00004739 diag::err_default_arg_in_partial_spec);
John McCall833ca992009-10-29 08:12:44 +00004740 TTP->removeDefaultArgument();
Douglas Gregor05396e22009-08-25 17:23:04 +00004741 }
4742 } else if (NonTypeTemplateParmDecl *NTTP
4743 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
4744 if (Expr *DefArg = NTTP->getDefaultArgument()) {
Mike Stump1eb44332009-09-09 15:08:12 +00004745 Diag(NTTP->getDefaultArgumentLoc(),
Douglas Gregor05396e22009-08-25 17:23:04 +00004746 diag::err_default_arg_in_partial_spec)
4747 << DefArg->getSourceRange();
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00004748 NTTP->removeDefaultArgument();
Douglas Gregor05396e22009-08-25 17:23:04 +00004749 }
4750 } else {
4751 TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(Param);
Douglas Gregor788cd062009-11-11 01:00:40 +00004752 if (TTP->hasDefaultArgument()) {
4753 Diag(TTP->getDefaultArgument().getLocation(),
Douglas Gregor05396e22009-08-25 17:23:04 +00004754 diag::err_default_arg_in_partial_spec)
Douglas Gregor788cd062009-11-11 01:00:40 +00004755 << TTP->getDefaultArgument().getSourceRange();
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00004756 TTP->removeDefaultArgument();
Douglas Gregorba1ecb52009-06-12 19:43:02 +00004757 }
4758 }
4759 }
Douglas Gregora735b202009-10-13 14:39:41 +00004760 } else if (TemplateParams) {
4761 if (TUK == TUK_Friend)
4762 Diag(KWLoc, diag::err_template_spec_friend)
Douglas Gregor849b2432010-03-31 17:46:05 +00004763 << FixItHint::CreateRemoval(
Douglas Gregora735b202009-10-13 14:39:41 +00004764 SourceRange(TemplateParams->getTemplateLoc(),
4765 TemplateParams->getRAngleLoc()))
4766 << SourceRange(LAngleLoc, RAngleLoc);
4767 else
4768 isExplicitSpecialization = true;
4769 } else if (TUK != TUK_Friend) {
Douglas Gregor05396e22009-08-25 17:23:04 +00004770 Diag(KWLoc, diag::err_template_spec_needs_header)
Douglas Gregor849b2432010-03-31 17:46:05 +00004771 << FixItHint::CreateInsertion(KWLoc, "template<> ");
Douglas Gregor1fef4e62009-10-07 22:35:40 +00004772 isExplicitSpecialization = true;
4773 }
Douglas Gregor88b70942009-02-25 22:02:03 +00004774
Douglas Gregorcc636682009-02-17 23:15:12 +00004775 // Check that the specialization uses the same tag kind as the
4776 // original template.
Abramo Bagnara465d41b2010-05-11 21:36:43 +00004777 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
4778 assert(Kind != TTK_Enum && "Invalid enum tag in class template spec!");
Douglas Gregor501c5ce2009-05-14 16:41:31 +00004779 if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(),
Richard Trieubbf34c02011-06-10 03:11:26 +00004780 Kind, TUK == TUK_Definition, KWLoc,
Douglas Gregor501c5ce2009-05-14 16:41:31 +00004781 *ClassTemplate->getIdentifier())) {
Mike Stump1eb44332009-09-09 15:08:12 +00004782 Diag(KWLoc, diag::err_use_with_wrong_tag)
Douglas Gregora3a83512009-04-01 23:51:29 +00004783 << ClassTemplate
Douglas Gregor849b2432010-03-31 17:46:05 +00004784 << FixItHint::CreateReplacement(KWLoc,
Douglas Gregora3a83512009-04-01 23:51:29 +00004785 ClassTemplate->getTemplatedDecl()->getKindName());
Mike Stump1eb44332009-09-09 15:08:12 +00004786 Diag(ClassTemplate->getTemplatedDecl()->getLocation(),
Douglas Gregorcc636682009-02-17 23:15:12 +00004787 diag::note_previous_use);
4788 Kind = ClassTemplate->getTemplatedDecl()->getTagKind();
4789 }
4790
Douglas Gregor40808ce2009-03-09 23:48:35 +00004791 // Translate the parser's template argument list in our AST format.
John McCalld5532b62009-11-23 01:53:49 +00004792 TemplateArgumentListInfo TemplateArgs;
4793 TemplateArgs.setLAngleLoc(LAngleLoc);
4794 TemplateArgs.setRAngleLoc(RAngleLoc);
Douglas Gregor314b97f2009-11-10 19:49:08 +00004795 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
Douglas Gregor40808ce2009-03-09 23:48:35 +00004796
Douglas Gregor925910d2011-01-03 20:35:03 +00004797 // Check for unexpanded parameter packs in any of the template arguments.
4798 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004799 if (DiagnoseUnexpandedParameterPack(TemplateArgs[I],
Douglas Gregor925910d2011-01-03 20:35:03 +00004800 UPPC_PartialSpecialization))
4801 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004802
Douglas Gregorcc636682009-02-17 23:15:12 +00004803 // Check that the template argument list is well-formed for this
4804 // template.
Douglas Gregor910f8002010-11-07 23:05:16 +00004805 llvm::SmallVector<TemplateArgument, 4> Converted;
John McCalld5532b62009-11-23 01:53:49 +00004806 if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc,
4807 TemplateArgs, false, Converted))
Douglas Gregor212e81c2009-03-25 00:13:59 +00004808 return true;
Douglas Gregorcc636682009-02-17 23:15:12 +00004809
Douglas Gregor910f8002010-11-07 23:05:16 +00004810 assert((Converted.size() == ClassTemplate->getTemplateParameters()->size()) &&
Douglas Gregorcc636682009-02-17 23:15:12 +00004811 "Converted template argument list is too short!");
Mike Stump1eb44332009-09-09 15:08:12 +00004812
Douglas Gregorc8ab2562009-05-31 09:31:02 +00004813 // Find the class template (partial) specialization declaration that
Douglas Gregorcc636682009-02-17 23:15:12 +00004814 // corresponds to these arguments.
Douglas Gregorba1ecb52009-06-12 19:43:02 +00004815 if (isPartialSpecialization) {
Douglas Gregorbacb9492011-01-03 21:13:47 +00004816 if (CheckClassTemplatePartialSpecializationArgs(*this,
Douglas Gregore94866f2009-06-12 21:21:02 +00004817 ClassTemplate->getTemplateParameters(),
Douglas Gregorb9c66312010-12-23 17:13:55 +00004818 Converted))
Douglas Gregore94866f2009-06-12 21:21:02 +00004819 return true;
4820
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004821 if (!Name.isDependent() &&
Douglas Gregorde090962010-02-09 00:37:32 +00004822 !TemplateSpecializationType::anyDependentTemplateArguments(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004823 TemplateArgs.getArgumentArray(),
Douglas Gregorde090962010-02-09 00:37:32 +00004824 TemplateArgs.size())) {
4825 Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized)
4826 << ClassTemplate->getDeclName();
4827 isPartialSpecialization = false;
Douglas Gregorde090962010-02-09 00:37:32 +00004828 }
4829 }
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00004830
Douglas Gregorcc636682009-02-17 23:15:12 +00004831 void *InsertPos = 0;
Douglas Gregorc8ab2562009-05-31 09:31:02 +00004832 ClassTemplateSpecializationDecl *PrevDecl = 0;
4833
4834 if (isPartialSpecialization)
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00004835 // FIXME: Template parameter list matters, too
Douglas Gregorc8ab2562009-05-31 09:31:02 +00004836 PrevDecl
Douglas Gregor910f8002010-11-07 23:05:16 +00004837 = ClassTemplate->findPartialSpecialization(Converted.data(),
4838 Converted.size(),
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00004839 InsertPos);
Douglas Gregorc8ab2562009-05-31 09:31:02 +00004840 else
4841 PrevDecl
Douglas Gregor910f8002010-11-07 23:05:16 +00004842 = ClassTemplate->findSpecialization(Converted.data(),
4843 Converted.size(), InsertPos);
Douglas Gregorcc636682009-02-17 23:15:12 +00004844
4845 ClassTemplateSpecializationDecl *Specialization = 0;
4846
Douglas Gregor88b70942009-02-25 22:02:03 +00004847 // Check whether we can declare a class template specialization in
4848 // the current scope.
Douglas Gregorfc9cd612009-09-26 20:57:03 +00004849 if (TUK != TUK_Friend &&
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004850 CheckTemplateSpecializationScope(*this, ClassTemplate, PrevDecl,
4851 TemplateNameLoc,
Douglas Gregor9302da62009-10-14 23:50:59 +00004852 isPartialSpecialization))
Douglas Gregor212e81c2009-03-25 00:13:59 +00004853 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004854
Douglas Gregorb88e8882009-07-30 17:40:51 +00004855 // The canonical type
4856 QualType CanonType;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004857 if (PrevDecl &&
Douglas Gregorfc9cd612009-09-26 20:57:03 +00004858 (PrevDecl->getSpecializationKind() == TSK_Undeclared ||
Douglas Gregorde090962010-02-09 00:37:32 +00004859 TUK == TUK_Friend)) {
Douglas Gregorcc636682009-02-17 23:15:12 +00004860 // Since the only prior class template specialization with these
Douglas Gregorfc9cd612009-09-26 20:57:03 +00004861 // arguments was referenced but not declared, or we're only
4862 // referencing this specialization as a friend, reuse that
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00004863 // declaration node as our own, updating its source location and
4864 // the list of outer template parameters to reflect our new declaration.
Douglas Gregorcc636682009-02-17 23:15:12 +00004865 Specialization = PrevDecl;
Douglas Gregor6bc9f7e2009-02-25 22:18:32 +00004866 Specialization->setLocation(TemplateNameLoc);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00004867 if (TemplateParameterLists.size() > 0) {
4868 Specialization->setTemplateParameterListsInfo(Context,
4869 TemplateParameterLists.size(),
4870 (TemplateParameterList**) TemplateParameterLists.release());
4871 }
Douglas Gregorcc636682009-02-17 23:15:12 +00004872 PrevDecl = 0;
Douglas Gregorb88e8882009-07-30 17:40:51 +00004873 CanonType = Context.getTypeDeclType(Specialization);
Douglas Gregorc8ab2562009-05-31 09:31:02 +00004874 } else if (isPartialSpecialization) {
Douglas Gregorb88e8882009-07-30 17:40:51 +00004875 // Build the canonical type that describes the converted template
4876 // arguments of the class template partial specialization.
Douglas Gregorde090962010-02-09 00:37:32 +00004877 TemplateName CanonTemplate = Context.getCanonicalTemplateName(Name);
4878 CanonType = Context.getTemplateSpecializationType(CanonTemplate,
Douglas Gregorb9c66312010-12-23 17:13:55 +00004879 Converted.data(),
4880 Converted.size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004881
4882 if (Context.hasSameType(CanonType,
Douglas Gregorb9c66312010-12-23 17:13:55 +00004883 ClassTemplate->getInjectedClassNameSpecialization())) {
4884 // C++ [temp.class.spec]p9b3:
4885 //
4886 // -- The argument list of the specialization shall not be identical
4887 // to the implicit argument list of the primary template.
4888 Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template)
4889 << (TUK == TUK_Definition)
4890 << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc));
4891 return CheckClassTemplate(S, TagSpec, TUK, KWLoc, SS,
4892 ClassTemplate->getIdentifier(),
4893 TemplateNameLoc,
4894 Attr,
4895 TemplateParams,
Abramo Bagnarac57c17d2011-03-10 13:28:31 +00004896 AS_none,
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00004897 TemplateParameterLists.size() - 1,
Abramo Bagnarac57c17d2011-03-10 13:28:31 +00004898 (TemplateParameterList**) TemplateParameterLists.release());
Douglas Gregorb9c66312010-12-23 17:13:55 +00004899 }
Douglas Gregorb88e8882009-07-30 17:40:51 +00004900
Douglas Gregorc8ab2562009-05-31 09:31:02 +00004901 // Create a new class template partial specialization declaration node.
Douglas Gregorc8ab2562009-05-31 09:31:02 +00004902 ClassTemplatePartialSpecializationDecl *PrevPartial
4903 = cast_or_null<ClassTemplatePartialSpecializationDecl>(PrevDecl);
Douglas Gregordc60c1e2010-04-30 05:56:50 +00004904 unsigned SequenceNumber = PrevPartial? PrevPartial->getSequenceNumber()
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00004905 : ClassTemplate->getNextPartialSpecSequenceNumber();
Mike Stump1eb44332009-09-09 15:08:12 +00004906 ClassTemplatePartialSpecializationDecl *Partial
Douglas Gregor13c85772010-05-06 00:28:52 +00004907 = ClassTemplatePartialSpecializationDecl::Create(Context, Kind,
Douglas Gregorc8ab2562009-05-31 09:31:02 +00004908 ClassTemplate->getDeclContext(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00004909 KWLoc, TemplateNameLoc,
Anders Carlsson91fdf6f2009-06-05 04:06:48 +00004910 TemplateParams,
4911 ClassTemplate,
Douglas Gregor910f8002010-11-07 23:05:16 +00004912 Converted.data(),
4913 Converted.size(),
John McCalld5532b62009-11-23 01:53:49 +00004914 TemplateArgs,
John McCall3cb0ebd2010-03-10 03:28:59 +00004915 CanonType,
Douglas Gregordc60c1e2010-04-30 05:56:50 +00004916 PrevPartial,
4917 SequenceNumber);
John McCallb6217662010-03-15 10:12:16 +00004918 SetNestedNameSpecifier(Partial, SS);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00004919 if (TemplateParameterLists.size() > 1 && SS.isSet()) {
Douglas Gregorc722ea42010-06-15 17:44:38 +00004920 Partial->setTemplateParameterListsInfo(Context,
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00004921 TemplateParameterLists.size() - 1,
Abramo Bagnara9b934882010-06-12 08:15:14 +00004922 (TemplateParameterList**) TemplateParameterLists.release());
4923 }
Douglas Gregorc8ab2562009-05-31 09:31:02 +00004924
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00004925 if (!PrevPartial)
4926 ClassTemplate->AddPartialSpecialization(Partial, InsertPos);
Douglas Gregorc8ab2562009-05-31 09:31:02 +00004927 Specialization = Partial;
Douglas Gregor031a5882009-06-13 00:26:55 +00004928
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004929 // If we are providing an explicit specialization of a member class
Douglas Gregored9c0f92009-10-29 00:04:11 +00004930 // template specialization, make a note of that.
4931 if (PrevPartial && PrevPartial->getInstantiatedFromMember())
4932 PrevPartial->setMemberSpecialization();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004933
Douglas Gregor031a5882009-06-13 00:26:55 +00004934 // Check that all of the template parameters of the class template
4935 // partial specialization are deducible from the template
4936 // arguments. If not, this class template partial specialization
4937 // will never be used.
4938 llvm::SmallVector<bool, 8> DeducibleParams;
4939 DeducibleParams.resize(TemplateParams->size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004940 MarkUsedTemplateParameters(Partial->getTemplateArgs(), true,
Douglas Gregored9c0f92009-10-29 00:04:11 +00004941 TemplateParams->getDepth(),
Douglas Gregore73bb602009-09-14 21:25:05 +00004942 DeducibleParams);
Douglas Gregor031a5882009-06-13 00:26:55 +00004943 unsigned NumNonDeducible = 0;
4944 for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I)
4945 if (!DeducibleParams[I])
4946 ++NumNonDeducible;
4947
4948 if (NumNonDeducible) {
4949 Diag(TemplateNameLoc, diag::warn_partial_specs_not_deducible)
4950 << (NumNonDeducible > 1)
4951 << SourceRange(TemplateNameLoc, RAngleLoc);
4952 for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) {
4953 if (!DeducibleParams[I]) {
4954 NamedDecl *Param = cast<NamedDecl>(TemplateParams->getParam(I));
4955 if (Param->getDeclName())
Mike Stump1eb44332009-09-09 15:08:12 +00004956 Diag(Param->getLocation(),
Douglas Gregor031a5882009-06-13 00:26:55 +00004957 diag::note_partial_spec_unused_parameter)
4958 << Param->getDeclName();
4959 else
Mike Stump1eb44332009-09-09 15:08:12 +00004960 Diag(Param->getLocation(),
Douglas Gregor031a5882009-06-13 00:26:55 +00004961 diag::note_partial_spec_unused_parameter)
Benjamin Kramer476d8b82010-08-11 14:47:12 +00004962 << "<anonymous>";
Douglas Gregor031a5882009-06-13 00:26:55 +00004963 }
4964 }
4965 }
Douglas Gregorcc636682009-02-17 23:15:12 +00004966 } else {
4967 // Create a new class template specialization declaration node for
Douglas Gregorfc9cd612009-09-26 20:57:03 +00004968 // this explicit specialization or friend declaration.
Douglas Gregorcc636682009-02-17 23:15:12 +00004969 Specialization
Douglas Gregor13c85772010-05-06 00:28:52 +00004970 = ClassTemplateSpecializationDecl::Create(Context, Kind,
Douglas Gregorcc636682009-02-17 23:15:12 +00004971 ClassTemplate->getDeclContext(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00004972 KWLoc, TemplateNameLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00004973 ClassTemplate,
Douglas Gregor910f8002010-11-07 23:05:16 +00004974 Converted.data(),
4975 Converted.size(),
Douglas Gregorcc636682009-02-17 23:15:12 +00004976 PrevDecl);
John McCallb6217662010-03-15 10:12:16 +00004977 SetNestedNameSpecifier(Specialization, SS);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00004978 if (TemplateParameterLists.size() > 0) {
Douglas Gregorc722ea42010-06-15 17:44:38 +00004979 Specialization->setTemplateParameterListsInfo(Context,
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00004980 TemplateParameterLists.size(),
Abramo Bagnara9b934882010-06-12 08:15:14 +00004981 (TemplateParameterList**) TemplateParameterLists.release());
4982 }
Douglas Gregorcc636682009-02-17 23:15:12 +00004983
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00004984 if (!PrevDecl)
4985 ClassTemplate->AddSpecialization(Specialization, InsertPos);
Douglas Gregorb88e8882009-07-30 17:40:51 +00004986
4987 CanonType = Context.getTypeDeclType(Specialization);
Douglas Gregorcc636682009-02-17 23:15:12 +00004988 }
4989
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00004990 // C++ [temp.expl.spec]p6:
4991 // If a template, a member template or the member of a class template is
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004992 // explicitly specialized then that specialization shall be declared
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00004993 // before the first use of that specialization that would cause an implicit
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004994 // instantiation to take place, in every translation unit in which such a
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00004995 // use occurs; no diagnostic is required.
4996 if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) {
Douglas Gregordc0a11c2010-02-26 06:03:23 +00004997 bool Okay = false;
4998 for (NamedDecl *Prev = PrevDecl; Prev; Prev = getPreviousDecl(Prev)) {
4999 // Is there any previous explicit specialization declaration?
5000 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) {
5001 Okay = true;
5002 break;
5003 }
5004 }
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005005
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005006 if (!Okay) {
5007 SourceRange Range(TemplateNameLoc, RAngleLoc);
5008 Diag(TemplateNameLoc, diag::err_specialization_after_instantiation)
5009 << Context.getTypeDeclType(Specialization) << Range;
5010
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005011 Diag(PrevDecl->getPointOfInstantiation(),
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005012 diag::note_instantiation_required_here)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005013 << (PrevDecl->getTemplateSpecializationKind()
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005014 != TSK_ImplicitInstantiation);
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005015 return true;
5016 }
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005017 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005018
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005019 // If this is not a friend, note that this is an explicit specialization.
5020 if (TUK != TUK_Friend)
5021 Specialization->setSpecializationKind(TSK_ExplicitSpecialization);
Douglas Gregorcc636682009-02-17 23:15:12 +00005022
5023 // Check that this isn't a redefinition of this specialization.
John McCall0f434ec2009-07-31 02:45:11 +00005024 if (TUK == TUK_Definition) {
Douglas Gregor952b0172010-02-11 01:04:33 +00005025 if (RecordDecl *Def = Specialization->getDefinition()) {
Douglas Gregorcc636682009-02-17 23:15:12 +00005026 SourceRange Range(TemplateNameLoc, RAngleLoc);
Mike Stump1eb44332009-09-09 15:08:12 +00005027 Diag(TemplateNameLoc, diag::err_redefinition)
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005028 << Context.getTypeDeclType(Specialization) << Range;
Douglas Gregorcc636682009-02-17 23:15:12 +00005029 Diag(Def->getLocation(), diag::note_previous_definition);
5030 Specialization->setInvalidDecl();
Douglas Gregor212e81c2009-03-25 00:13:59 +00005031 return true;
Douglas Gregorcc636682009-02-17 23:15:12 +00005032 }
5033 }
5034
John McCall7f1b9872010-12-18 03:30:47 +00005035 if (Attr)
5036 ProcessDeclAttributeList(S, Specialization, Attr);
5037
Douglas Gregorfc705b82009-02-26 22:19:44 +00005038 // Build the fully-sugared type for this class template
5039 // specialization as the user wrote in the specialization
5040 // itself. This means that we'll pretty-print the type retrieved
5041 // from the specialization's declaration the way that the user
5042 // actually wrote the specialization, rather than formatting the
5043 // name based on the "canonical" representation used to store the
5044 // template arguments in the specialization.
John McCall3cb0ebd2010-03-10 03:28:59 +00005045 TypeSourceInfo *WrittenTy
5046 = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc,
5047 TemplateArgs, CanonType);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005048 if (TUK != TUK_Friend) {
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005049 Specialization->setTypeAsWritten(WrittenTy);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005050 Specialization->setTemplateKeywordLoc(TemplateKWLoc);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005051 }
Douglas Gregor40808ce2009-03-09 23:48:35 +00005052 TemplateArgsIn.release();
Douglas Gregorcc636682009-02-17 23:15:12 +00005053
Douglas Gregor6bc9f7e2009-02-25 22:18:32 +00005054 // C++ [temp.expl.spec]p9:
5055 // A template explicit specialization is in the scope of the
5056 // namespace in which the template was defined.
5057 //
5058 // We actually implement this paragraph where we set the semantic
5059 // context (in the creation of the ClassTemplateSpecializationDecl),
5060 // but we also maintain the lexical context where the actual
5061 // definition occurs.
Douglas Gregorcc636682009-02-17 23:15:12 +00005062 Specialization->setLexicalDeclContext(CurContext);
Mike Stump1eb44332009-09-09 15:08:12 +00005063
Douglas Gregorcc636682009-02-17 23:15:12 +00005064 // We may be starting the definition of this specialization.
John McCall0f434ec2009-07-31 02:45:11 +00005065 if (TUK == TUK_Definition)
Douglas Gregorcc636682009-02-17 23:15:12 +00005066 Specialization->startDefinition();
5067
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005068 if (TUK == TUK_Friend) {
5069 FriendDecl *Friend = FriendDecl::Create(Context, CurContext,
5070 TemplateNameLoc,
John McCall32f2fb52010-03-25 18:04:51 +00005071 WrittenTy,
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005072 /*FIXME:*/KWLoc);
5073 Friend->setAccess(AS_public);
5074 CurContext->addDecl(Friend);
5075 } else {
5076 // Add the specialization into its lexical context, so that it can
5077 // be seen when iterating through the list of declarations in that
5078 // context. However, specializations are not found by name lookup.
5079 CurContext->addDecl(Specialization);
5080 }
John McCalld226f652010-08-21 09:40:31 +00005081 return Specialization;
Douglas Gregorcc636682009-02-17 23:15:12 +00005082}
Douglas Gregord57959a2009-03-27 23:10:48 +00005083
John McCalld226f652010-08-21 09:40:31 +00005084Decl *Sema::ActOnTemplateDeclarator(Scope *S,
Douglas Gregore542c862009-06-23 23:11:28 +00005085 MultiTemplateParamsArg TemplateParameterLists,
John McCalld226f652010-08-21 09:40:31 +00005086 Declarator &D) {
Douglas Gregore542c862009-06-23 23:11:28 +00005087 return HandleDeclarator(S, D, move(TemplateParameterLists), false);
5088}
5089
John McCalld226f652010-08-21 09:40:31 +00005090Decl *Sema::ActOnStartOfFunctionTemplateDef(Scope *FnBodyScope,
Douglas Gregor52591bf2009-06-24 00:54:41 +00005091 MultiTemplateParamsArg TemplateParameterLists,
John McCalld226f652010-08-21 09:40:31 +00005092 Declarator &D) {
Douglas Gregor52591bf2009-06-24 00:54:41 +00005093 assert(getCurFunctionDecl() == 0 && "Function parsing confused");
Abramo Bagnara075f8f12010-12-10 16:29:40 +00005094 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
Mike Stump1eb44332009-09-09 15:08:12 +00005095
Douglas Gregor52591bf2009-06-24 00:54:41 +00005096 if (FTI.hasPrototype) {
Mike Stump1eb44332009-09-09 15:08:12 +00005097 // FIXME: Diagnose arguments without names in C.
Douglas Gregor52591bf2009-06-24 00:54:41 +00005098 }
Mike Stump1eb44332009-09-09 15:08:12 +00005099
Douglas Gregor52591bf2009-06-24 00:54:41 +00005100 Scope *ParentScope = FnBodyScope->getParent();
Mike Stump1eb44332009-09-09 15:08:12 +00005101
John McCalld226f652010-08-21 09:40:31 +00005102 Decl *DP = HandleDeclarator(ParentScope, D,
5103 move(TemplateParameterLists),
5104 /*IsFunctionDefinition=*/true);
Mike Stump1eb44332009-09-09 15:08:12 +00005105 if (FunctionTemplateDecl *FunctionTemplate
John McCalld226f652010-08-21 09:40:31 +00005106 = dyn_cast_or_null<FunctionTemplateDecl>(DP))
Mike Stump1eb44332009-09-09 15:08:12 +00005107 return ActOnStartOfFunctionDef(FnBodyScope,
John McCalld226f652010-08-21 09:40:31 +00005108 FunctionTemplate->getTemplatedDecl());
5109 if (FunctionDecl *Function = dyn_cast_or_null<FunctionDecl>(DP))
5110 return ActOnStartOfFunctionDef(FnBodyScope, Function);
5111 return 0;
Douglas Gregor52591bf2009-06-24 00:54:41 +00005112}
5113
John McCall75042392010-02-11 01:33:53 +00005114/// \brief Strips various properties off an implicit instantiation
5115/// that has just been explicitly specialized.
5116static void StripImplicitInstantiation(NamedDecl *D) {
Sean Huntcf807c42010-08-18 23:23:40 +00005117 D->dropAttrs();
John McCall75042392010-02-11 01:33:53 +00005118
5119 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
5120 FD->setInlineSpecified(false);
5121 }
5122}
5123
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005124/// \brief Diagnose cases where we have an explicit template specialization
Douglas Gregor454885e2009-10-15 15:54:05 +00005125/// before/after an explicit template instantiation, producing diagnostics
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005126/// for those cases where they are required and determining whether the
Douglas Gregor454885e2009-10-15 15:54:05 +00005127/// new specialization/instantiation will have any effect.
5128///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005129/// \param NewLoc the location of the new explicit specialization or
Douglas Gregor454885e2009-10-15 15:54:05 +00005130/// instantiation.
5131///
5132/// \param NewTSK the kind of the new explicit specialization or instantiation.
5133///
5134/// \param PrevDecl the previous declaration of the entity.
5135///
5136/// \param PrevTSK the kind of the old explicit specialization or instantiatin.
5137///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005138/// \param PrevPointOfInstantiation if valid, indicates where the previus
Douglas Gregor454885e2009-10-15 15:54:05 +00005139/// declaration was instantiated (either implicitly or explicitly).
5140///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005141/// \param HasNoEffect will be set to true to indicate that the new
Douglas Gregor454885e2009-10-15 15:54:05 +00005142/// specialization or instantiation has no effect and should be ignored.
5143///
5144/// \returns true if there was an error that should prevent the introduction of
5145/// the new declaration into the AST, false otherwise.
Douglas Gregor0d035142009-10-27 18:42:08 +00005146bool
5147Sema::CheckSpecializationInstantiationRedecl(SourceLocation NewLoc,
5148 TemplateSpecializationKind NewTSK,
5149 NamedDecl *PrevDecl,
5150 TemplateSpecializationKind PrevTSK,
5151 SourceLocation PrevPointOfInstantiation,
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005152 bool &HasNoEffect) {
5153 HasNoEffect = false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005154
Douglas Gregor454885e2009-10-15 15:54:05 +00005155 switch (NewTSK) {
5156 case TSK_Undeclared:
5157 case TSK_ImplicitInstantiation:
5158 assert(false && "Don't check implicit instantiations here");
5159 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005160
Douglas Gregor454885e2009-10-15 15:54:05 +00005161 case TSK_ExplicitSpecialization:
5162 switch (PrevTSK) {
5163 case TSK_Undeclared:
5164 case TSK_ExplicitSpecialization:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005165 // Okay, we're just specializing something that is either already
Douglas Gregor454885e2009-10-15 15:54:05 +00005166 // explicitly specialized or has merely been mentioned without any
5167 // instantiation.
5168 return false;
5169
5170 case TSK_ImplicitInstantiation:
5171 if (PrevPointOfInstantiation.isInvalid()) {
5172 // The declaration itself has not actually been instantiated, so it is
5173 // still okay to specialize it.
John McCall75042392010-02-11 01:33:53 +00005174 StripImplicitInstantiation(PrevDecl);
Douglas Gregor454885e2009-10-15 15:54:05 +00005175 return false;
5176 }
5177 // Fall through
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005178
Douglas Gregor454885e2009-10-15 15:54:05 +00005179 case TSK_ExplicitInstantiationDeclaration:
5180 case TSK_ExplicitInstantiationDefinition:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005181 assert((PrevTSK == TSK_ImplicitInstantiation ||
5182 PrevPointOfInstantiation.isValid()) &&
Douglas Gregor454885e2009-10-15 15:54:05 +00005183 "Explicit instantiation without point of instantiation?");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005184
Douglas Gregor454885e2009-10-15 15:54:05 +00005185 // C++ [temp.expl.spec]p6:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005186 // If a template, a member template or the member of a class template
Douglas Gregor454885e2009-10-15 15:54:05 +00005187 // is explicitly specialized then that specialization shall be declared
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005188 // before the first use of that specialization that would cause an
Douglas Gregor454885e2009-10-15 15:54:05 +00005189 // implicit instantiation to take place, in every translation unit in
5190 // which such a use occurs; no diagnostic is required.
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005191 for (NamedDecl *Prev = PrevDecl; Prev; Prev = getPreviousDecl(Prev)) {
5192 // Is there any previous explicit specialization declaration?
5193 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization)
5194 return false;
5195 }
5196
Douglas Gregor0d035142009-10-27 18:42:08 +00005197 Diag(NewLoc, diag::err_specialization_after_instantiation)
Douglas Gregor454885e2009-10-15 15:54:05 +00005198 << PrevDecl;
Douglas Gregor0d035142009-10-27 18:42:08 +00005199 Diag(PrevPointOfInstantiation, diag::note_instantiation_required_here)
Douglas Gregor454885e2009-10-15 15:54:05 +00005200 << (PrevTSK != TSK_ImplicitInstantiation);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005201
Douglas Gregor454885e2009-10-15 15:54:05 +00005202 return true;
5203 }
5204 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005205
Douglas Gregor454885e2009-10-15 15:54:05 +00005206 case TSK_ExplicitInstantiationDeclaration:
5207 switch (PrevTSK) {
5208 case TSK_ExplicitInstantiationDeclaration:
5209 // This explicit instantiation declaration is redundant (that's okay).
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005210 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00005211 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005212
Douglas Gregor454885e2009-10-15 15:54:05 +00005213 case TSK_Undeclared:
5214 case TSK_ImplicitInstantiation:
5215 // We're explicitly instantiating something that may have already been
5216 // implicitly instantiated; that's fine.
5217 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005218
Douglas Gregor454885e2009-10-15 15:54:05 +00005219 case TSK_ExplicitSpecialization:
5220 // C++0x [temp.explicit]p4:
5221 // For a given set of template parameters, if an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005222 // of a template appears after a declaration of an explicit
Douglas Gregor454885e2009-10-15 15:54:05 +00005223 // specialization for that template, the explicit instantiation has no
5224 // effect.
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005225 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00005226 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005227
Douglas Gregor454885e2009-10-15 15:54:05 +00005228 case TSK_ExplicitInstantiationDefinition:
5229 // C++0x [temp.explicit]p10:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005230 // If an entity is the subject of both an explicit instantiation
5231 // declaration and an explicit instantiation definition in the same
Douglas Gregor454885e2009-10-15 15:54:05 +00005232 // translation unit, the definition shall follow the declaration.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005233 Diag(NewLoc,
Douglas Gregor0d035142009-10-27 18:42:08 +00005234 diag::err_explicit_instantiation_declaration_after_definition);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005235 Diag(PrevPointOfInstantiation,
Douglas Gregor0d035142009-10-27 18:42:08 +00005236 diag::note_explicit_instantiation_definition_here);
Douglas Gregor454885e2009-10-15 15:54:05 +00005237 assert(PrevPointOfInstantiation.isValid() &&
5238 "Explicit instantiation without point of instantiation?");
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005239 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00005240 return false;
5241 }
5242 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005243
Douglas Gregor454885e2009-10-15 15:54:05 +00005244 case TSK_ExplicitInstantiationDefinition:
5245 switch (PrevTSK) {
5246 case TSK_Undeclared:
5247 case TSK_ImplicitInstantiation:
5248 // We're explicitly instantiating something that may have already been
5249 // implicitly instantiated; that's fine.
5250 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005251
Douglas Gregor454885e2009-10-15 15:54:05 +00005252 case TSK_ExplicitSpecialization:
5253 // C++ DR 259, C++0x [temp.explicit]p4:
5254 // For a given set of template parameters, if an explicit
5255 // instantiation of a template appears after a declaration of
5256 // an explicit specialization for that template, the explicit
5257 // instantiation has no effect.
5258 //
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005259 // In C++98/03 mode, we only give an extension warning here, because it
Douglas Gregorc42b6522010-04-09 21:02:29 +00005260 // is not harmful to try to explicitly instantiate something that
Douglas Gregor454885e2009-10-15 15:54:05 +00005261 // has been explicitly specialized.
Douglas Gregor0d035142009-10-27 18:42:08 +00005262 if (!getLangOptions().CPlusPlus0x) {
5263 Diag(NewLoc, diag::ext_explicit_instantiation_after_specialization)
Douglas Gregor454885e2009-10-15 15:54:05 +00005264 << PrevDecl;
Douglas Gregor0d035142009-10-27 18:42:08 +00005265 Diag(PrevDecl->getLocation(),
Douglas Gregor454885e2009-10-15 15:54:05 +00005266 diag::note_previous_template_specialization);
5267 }
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005268 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00005269 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005270
Douglas Gregor454885e2009-10-15 15:54:05 +00005271 case TSK_ExplicitInstantiationDeclaration:
5272 // We're explicity instantiating a definition for something for which we
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005273 // were previously asked to suppress instantiations. That's fine.
Douglas Gregor454885e2009-10-15 15:54:05 +00005274 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005275
Douglas Gregor454885e2009-10-15 15:54:05 +00005276 case TSK_ExplicitInstantiationDefinition:
5277 // C++0x [temp.spec]p5:
5278 // For a given template and a given set of template-arguments,
5279 // - an explicit instantiation definition shall appear at most once
5280 // in a program,
Douglas Gregor0d035142009-10-27 18:42:08 +00005281 Diag(NewLoc, diag::err_explicit_instantiation_duplicate)
Douglas Gregor454885e2009-10-15 15:54:05 +00005282 << PrevDecl;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005283 Diag(PrevPointOfInstantiation,
Douglas Gregor0d035142009-10-27 18:42:08 +00005284 diag::note_previous_explicit_instantiation);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005285 HasNoEffect = true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005286 return false;
Douglas Gregor454885e2009-10-15 15:54:05 +00005287 }
5288 break;
5289 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005290
Douglas Gregor454885e2009-10-15 15:54:05 +00005291 assert(false && "Missing specialization/instantiation case?");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005292
Douglas Gregor454885e2009-10-15 15:54:05 +00005293 return false;
5294}
5295
John McCallaf2094e2010-04-08 09:05:18 +00005296/// \brief Perform semantic analysis for the given dependent function
5297/// template specialization. The only possible way to get a dependent
5298/// function template specialization is with a friend declaration,
5299/// like so:
5300///
5301/// template <class T> void foo(T);
5302/// template <class T> class A {
5303/// friend void foo<>(T);
5304/// };
5305///
5306/// There really isn't any useful analysis we can do here, so we
5307/// just store the information.
5308bool
5309Sema::CheckDependentFunctionTemplateSpecialization(FunctionDecl *FD,
5310 const TemplateArgumentListInfo &ExplicitTemplateArgs,
5311 LookupResult &Previous) {
5312 // Remove anything from Previous that isn't a function template in
5313 // the correct context.
Sebastian Redl7a126a42010-08-31 00:36:30 +00005314 DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext();
John McCallaf2094e2010-04-08 09:05:18 +00005315 LookupResult::Filter F = Previous.makeFilter();
5316 while (F.hasNext()) {
5317 NamedDecl *D = F.next()->getUnderlyingDecl();
5318 if (!isa<FunctionTemplateDecl>(D) ||
Sebastian Redl7a126a42010-08-31 00:36:30 +00005319 !FDLookupContext->InEnclosingNamespaceSetOf(
5320 D->getDeclContext()->getRedeclContext()))
John McCallaf2094e2010-04-08 09:05:18 +00005321 F.erase();
5322 }
5323 F.done();
5324
5325 // Should this be diagnosed here?
5326 if (Previous.empty()) return true;
5327
5328 FD->setDependentTemplateSpecialization(Context, Previous.asUnresolvedSet(),
5329 ExplicitTemplateArgs);
5330 return false;
5331}
5332
Abramo Bagnarae03db982010-05-20 15:32:11 +00005333/// \brief Perform semantic analysis for the given function template
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005334/// specialization.
5335///
Abramo Bagnarae03db982010-05-20 15:32:11 +00005336/// This routine performs all of the semantic analysis required for an
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005337/// explicit function template specialization. On successful completion,
5338/// the function declaration \p FD will become a function template
5339/// specialization.
5340///
5341/// \param FD the function declaration, which will be updated to become a
5342/// function template specialization.
5343///
Abramo Bagnarae03db982010-05-20 15:32:11 +00005344/// \param ExplicitTemplateArgs the explicitly-provided template arguments,
5345/// if any. Note that this may be valid info even when 0 arguments are
5346/// explicitly provided as in, e.g., \c void sort<>(char*, char*);
5347/// as it anyway contains info on the angle brackets locations.
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005348///
Abramo Bagnarae03db982010-05-20 15:32:11 +00005349/// \param PrevDecl the set of declarations that may be specialized by
5350/// this function specialization.
5351bool
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005352Sema::CheckFunctionTemplateSpecialization(FunctionDecl *FD,
Douglas Gregor67714232011-03-03 02:41:12 +00005353 TemplateArgumentListInfo *ExplicitTemplateArgs,
John McCall68263142009-11-18 22:49:29 +00005354 LookupResult &Previous) {
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005355 // The set of function template specializations that could match this
5356 // explicit function template specialization.
John McCallc373d482010-01-27 01:50:18 +00005357 UnresolvedSet<8> Candidates;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005358
Sebastian Redl7a126a42010-08-31 00:36:30 +00005359 DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext();
John McCall68263142009-11-18 22:49:29 +00005360 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
5361 I != E; ++I) {
5362 NamedDecl *Ovl = (*I)->getUnderlyingDecl();
5363 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Ovl)) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005364 // Only consider templates found within the same semantic lookup scope as
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005365 // FD.
Sebastian Redl7a126a42010-08-31 00:36:30 +00005366 if (!FDLookupContext->InEnclosingNamespaceSetOf(
5367 Ovl->getDeclContext()->getRedeclContext()))
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005368 continue;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005369
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005370 // C++ [temp.expl.spec]p11:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005371 // A trailing template-argument can be left unspecified in the
5372 // template-id naming an explicit function template specialization
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005373 // provided it can be deduced from the function argument type.
5374 // Perform template argument deduction to determine whether we may be
5375 // specializing this template.
5376 // FIXME: It is somewhat wasteful to build
John McCall5769d612010-02-08 23:07:23 +00005377 TemplateDeductionInfo Info(Context, FD->getLocation());
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005378 FunctionDecl *Specialization = 0;
5379 if (TemplateDeductionResult TDK
John McCalld5532b62009-11-23 01:53:49 +00005380 = DeduceTemplateArguments(FunTmpl, ExplicitTemplateArgs,
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005381 FD->getType(),
5382 Specialization,
5383 Info)) {
5384 // FIXME: Template argument deduction failed; record why it failed, so
5385 // that we can provide nifty diagnostics.
5386 (void)TDK;
5387 continue;
5388 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005389
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005390 // Record this candidate.
John McCallc373d482010-01-27 01:50:18 +00005391 Candidates.addDecl(Specialization, I.getAccess());
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005392 }
5393 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005394
Douglas Gregorc5df30f2009-09-26 03:41:46 +00005395 // Find the most specialized function template.
John McCallc373d482010-01-27 01:50:18 +00005396 UnresolvedSetIterator Result
5397 = getMostSpecialized(Candidates.begin(), Candidates.end(),
Douglas Gregor5c7bf422011-01-11 17:34:58 +00005398 TPOC_Other, 0, FD->getLocation(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005399 PDiag(diag::err_function_template_spec_no_match)
Douglas Gregorc5df30f2009-09-26 03:41:46 +00005400 << FD->getDeclName(),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00005401 PDiag(diag::err_function_template_spec_ambiguous)
John McCalld5532b62009-11-23 01:53:49 +00005402 << FD->getDeclName() << (ExplicitTemplateArgs != 0),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00005403 PDiag(diag::note_function_template_spec_matched));
John McCallc373d482010-01-27 01:50:18 +00005404 if (Result == Candidates.end())
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005405 return true;
John McCallc373d482010-01-27 01:50:18 +00005406
5407 // Ignore access information; it doesn't figure into redeclaration checking.
5408 FunctionDecl *Specialization = cast<FunctionDecl>(*Result);
Abramo Bagnaraabfb4052011-03-04 17:20:30 +00005409
5410 FunctionTemplateSpecializationInfo *SpecInfo
5411 = Specialization->getTemplateSpecializationInfo();
5412 assert(SpecInfo && "Function template specialization info missing?");
5413 {
5414 // Note: do not overwrite location info if previous template
5415 // specialization kind was explicit.
5416 TemplateSpecializationKind TSK = SpecInfo->getTemplateSpecializationKind();
5417 if (TSK == TSK_Undeclared || TSK == TSK_ImplicitInstantiation)
5418 Specialization->setLocation(FD->getLocation());
5419 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005420
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005421 // FIXME: Check if the prior specialization has a point of instantiation.
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005422 // If so, we have run afoul of .
John McCall7ad650f2010-03-24 07:46:06 +00005423
5424 // If this is a friend declaration, then we're not really declaring
5425 // an explicit specialization.
5426 bool isFriend = (FD->getFriendObjectKind() != Decl::FOK_None);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005427
Douglas Gregord5cb8762009-10-07 00:13:32 +00005428 // Check the scope of this explicit specialization.
John McCall7ad650f2010-03-24 07:46:06 +00005429 if (!isFriend &&
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005430 CheckTemplateSpecializationScope(*this,
Douglas Gregord5cb8762009-10-07 00:13:32 +00005431 Specialization->getPrimaryTemplate(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005432 Specialization, FD->getLocation(),
Douglas Gregor9302da62009-10-14 23:50:59 +00005433 false))
Douglas Gregord5cb8762009-10-07 00:13:32 +00005434 return true;
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005435
5436 // C++ [temp.expl.spec]p6:
5437 // If a template, a member template or the member of a class template is
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005438 // explicitly specialized then that specialization shall be declared
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005439 // before the first use of that specialization that would cause an implicit
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005440 // instantiation to take place, in every translation unit in which such a
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005441 // use occurs; no diagnostic is required.
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005442 bool HasNoEffect = false;
John McCall7ad650f2010-03-24 07:46:06 +00005443 if (!isFriend &&
5444 CheckSpecializationInstantiationRedecl(FD->getLocation(),
John McCall75042392010-02-11 01:33:53 +00005445 TSK_ExplicitSpecialization,
5446 Specialization,
5447 SpecInfo->getTemplateSpecializationKind(),
5448 SpecInfo->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005449 HasNoEffect))
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005450 return true;
Douglas Gregore885e182011-05-21 18:53:30 +00005451
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005452 // Mark the prior declaration as an explicit specialization, so that later
5453 // clients know that this is an explicit specialization.
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00005454 if (!isFriend) {
John McCall7ad650f2010-03-24 07:46:06 +00005455 SpecInfo->setTemplateSpecializationKind(TSK_ExplicitSpecialization);
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00005456 MarkUnusedFileScopedDecl(Specialization);
5457 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005458
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005459 // Turn the given function declaration into a function template
5460 // specialization, with the template arguments from the previous
5461 // specialization.
Abramo Bagnarae03db982010-05-20 15:32:11 +00005462 // Take copies of (semantic and syntactic) template argument lists.
5463 const TemplateArgumentList* TemplArgs = new (Context)
5464 TemplateArgumentList(Specialization->getTemplateSpecializationArgs());
5465 const TemplateArgumentListInfo* TemplArgsAsWritten = ExplicitTemplateArgs
5466 ? new (Context) TemplateArgumentListInfo(*ExplicitTemplateArgs) : 0;
Douglas Gregor838db382010-02-11 01:19:42 +00005467 FD->setFunctionTemplateSpecialization(Specialization->getPrimaryTemplate(),
Abramo Bagnarae03db982010-05-20 15:32:11 +00005468 TemplArgs, /*InsertPos=*/0,
5469 SpecInfo->getTemplateSpecializationKind(),
5470 TemplArgsAsWritten);
Douglas Gregore885e182011-05-21 18:53:30 +00005471 FD->setStorageClass(Specialization->getStorageClass());
5472
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005473 // The "previous declaration" for this function template specialization is
5474 // the prior function template specialization.
John McCall68263142009-11-18 22:49:29 +00005475 Previous.clear();
5476 Previous.addDecl(Specialization);
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005477 return false;
5478}
5479
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005480/// \brief Perform semantic analysis for the given non-template member
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005481/// specialization.
5482///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005483/// This routine performs all of the semantic analysis required for an
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005484/// explicit member function specialization. On successful completion,
5485/// the function declaration \p FD will become a member function
5486/// specialization.
5487///
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005488/// \param Member the member declaration, which will be updated to become a
5489/// specialization.
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005490///
John McCall68263142009-11-18 22:49:29 +00005491/// \param Previous the set of declarations, one of which may be specialized
5492/// by this function specialization; the set will be modified to contain the
5493/// redeclared member.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005494bool
John McCall68263142009-11-18 22:49:29 +00005495Sema::CheckMemberSpecialization(NamedDecl *Member, LookupResult &Previous) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005496 assert(!isa<TemplateDecl>(Member) && "Only for non-template members");
John McCall77e8b112010-04-13 20:37:33 +00005497
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005498 // Try to find the member we are instantiating.
5499 NamedDecl *Instantiation = 0;
5500 NamedDecl *InstantiatedFrom = 0;
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005501 MemberSpecializationInfo *MSInfo = 0;
5502
John McCall68263142009-11-18 22:49:29 +00005503 if (Previous.empty()) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005504 // Nowhere to look anyway.
5505 } else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Member)) {
John McCall68263142009-11-18 22:49:29 +00005506 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
5507 I != E; ++I) {
5508 NamedDecl *D = (*I)->getUnderlyingDecl();
5509 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005510 if (Context.hasSameType(Function->getType(), Method->getType())) {
5511 Instantiation = Method;
5512 InstantiatedFrom = Method->getInstantiatedFromMemberFunction();
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005513 MSInfo = Method->getMemberSpecializationInfo();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005514 break;
5515 }
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005516 }
5517 }
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005518 } else if (isa<VarDecl>(Member)) {
John McCall68263142009-11-18 22:49:29 +00005519 VarDecl *PrevVar;
5520 if (Previous.isSingleResult() &&
5521 (PrevVar = dyn_cast<VarDecl>(Previous.getFoundDecl())))
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005522 if (PrevVar->isStaticDataMember()) {
John McCall68263142009-11-18 22:49:29 +00005523 Instantiation = PrevVar;
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005524 InstantiatedFrom = PrevVar->getInstantiatedFromStaticDataMember();
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005525 MSInfo = PrevVar->getMemberSpecializationInfo();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005526 }
5527 } else if (isa<RecordDecl>(Member)) {
John McCall68263142009-11-18 22:49:29 +00005528 CXXRecordDecl *PrevRecord;
5529 if (Previous.isSingleResult() &&
5530 (PrevRecord = dyn_cast<CXXRecordDecl>(Previous.getFoundDecl()))) {
5531 Instantiation = PrevRecord;
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005532 InstantiatedFrom = PrevRecord->getInstantiatedFromMemberClass();
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005533 MSInfo = PrevRecord->getMemberSpecializationInfo();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005534 }
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005535 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005536
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005537 if (!Instantiation) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005538 // There is no previous declaration that matches. Since member
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005539 // specializations are always out-of-line, the caller will complain about
5540 // this mismatch later.
5541 return false;
5542 }
John McCall77e8b112010-04-13 20:37:33 +00005543
5544 // If this is a friend, just bail out here before we start turning
5545 // things into explicit specializations.
5546 if (Member->getFriendObjectKind() != Decl::FOK_None) {
5547 // Preserve instantiation information.
5548 if (InstantiatedFrom && isa<CXXMethodDecl>(Member)) {
5549 cast<CXXMethodDecl>(Member)->setInstantiationOfMemberFunction(
5550 cast<CXXMethodDecl>(InstantiatedFrom),
5551 cast<CXXMethodDecl>(Instantiation)->getTemplateSpecializationKind());
5552 } else if (InstantiatedFrom && isa<CXXRecordDecl>(Member)) {
5553 cast<CXXRecordDecl>(Member)->setInstantiationOfMemberClass(
5554 cast<CXXRecordDecl>(InstantiatedFrom),
5555 cast<CXXRecordDecl>(Instantiation)->getTemplateSpecializationKind());
5556 }
5557
5558 Previous.clear();
5559 Previous.addDecl(Instantiation);
5560 return false;
5561 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005562
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005563 // Make sure that this is a specialization of a member.
5564 if (!InstantiatedFrom) {
5565 Diag(Member->getLocation(), diag::err_spec_member_not_instantiated)
5566 << Member;
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005567 Diag(Instantiation->getLocation(), diag::note_specialized_decl);
5568 return true;
5569 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005570
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005571 // C++ [temp.expl.spec]p6:
5572 // If a template, a member template or the member of a class template is
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005573 // explicitly specialized then that spe- cialization shall be declared
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005574 // before the first use of that specialization that would cause an implicit
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005575 // instantiation to take place, in every translation unit in which such a
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005576 // use occurs; no diagnostic is required.
5577 assert(MSInfo && "Member specialization info missing?");
John McCall75042392010-02-11 01:33:53 +00005578
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005579 bool HasNoEffect = false;
John McCall75042392010-02-11 01:33:53 +00005580 if (CheckSpecializationInstantiationRedecl(Member->getLocation(),
5581 TSK_ExplicitSpecialization,
5582 Instantiation,
5583 MSInfo->getTemplateSpecializationKind(),
5584 MSInfo->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005585 HasNoEffect))
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005586 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005587
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005588 // Check the scope of this explicit specialization.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005589 if (CheckTemplateSpecializationScope(*this,
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005590 InstantiatedFrom,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005591 Instantiation, Member->getLocation(),
Douglas Gregor9302da62009-10-14 23:50:59 +00005592 false))
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005593 return true;
Douglas Gregor2db32322009-10-07 23:56:10 +00005594
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005595 // Note that this is an explicit instantiation of a member.
Douglas Gregorf6b11852009-10-08 15:14:33 +00005596 // the original declaration to note that it is an explicit specialization
5597 // (if it was previously an implicit instantiation). This latter step
5598 // makes bookkeeping easier.
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005599 if (isa<FunctionDecl>(Member)) {
Douglas Gregorf6b11852009-10-08 15:14:33 +00005600 FunctionDecl *InstantiationFunction = cast<FunctionDecl>(Instantiation);
5601 if (InstantiationFunction->getTemplateSpecializationKind() ==
5602 TSK_ImplicitInstantiation) {
5603 InstantiationFunction->setTemplateSpecializationKind(
5604 TSK_ExplicitSpecialization);
5605 InstantiationFunction->setLocation(Member->getLocation());
5606 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005607
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005608 cast<FunctionDecl>(Member)->setInstantiationOfMemberFunction(
5609 cast<CXXMethodDecl>(InstantiatedFrom),
5610 TSK_ExplicitSpecialization);
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00005611 MarkUnusedFileScopedDecl(InstantiationFunction);
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005612 } else if (isa<VarDecl>(Member)) {
Douglas Gregorf6b11852009-10-08 15:14:33 +00005613 VarDecl *InstantiationVar = cast<VarDecl>(Instantiation);
5614 if (InstantiationVar->getTemplateSpecializationKind() ==
5615 TSK_ImplicitInstantiation) {
5616 InstantiationVar->setTemplateSpecializationKind(
5617 TSK_ExplicitSpecialization);
5618 InstantiationVar->setLocation(Member->getLocation());
5619 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005620
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005621 Context.setInstantiatedFromStaticDataMember(cast<VarDecl>(Member),
5622 cast<VarDecl>(InstantiatedFrom),
5623 TSK_ExplicitSpecialization);
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00005624 MarkUnusedFileScopedDecl(InstantiationVar);
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005625 } else {
5626 assert(isa<CXXRecordDecl>(Member) && "Only member classes remain");
Douglas Gregorf6b11852009-10-08 15:14:33 +00005627 CXXRecordDecl *InstantiationClass = cast<CXXRecordDecl>(Instantiation);
5628 if (InstantiationClass->getTemplateSpecializationKind() ==
5629 TSK_ImplicitInstantiation) {
5630 InstantiationClass->setTemplateSpecializationKind(
5631 TSK_ExplicitSpecialization);
5632 InstantiationClass->setLocation(Member->getLocation());
5633 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005634
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005635 cast<CXXRecordDecl>(Member)->setInstantiationOfMemberClass(
Douglas Gregorf6b11852009-10-08 15:14:33 +00005636 cast<CXXRecordDecl>(InstantiatedFrom),
5637 TSK_ExplicitSpecialization);
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005638 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005639
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005640 // Save the caller the trouble of having to figure out which declaration
5641 // this specialization matches.
John McCall68263142009-11-18 22:49:29 +00005642 Previous.clear();
5643 Previous.addDecl(Instantiation);
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005644 return false;
5645}
5646
Douglas Gregor558c0322009-10-14 23:41:34 +00005647/// \brief Check the scope of an explicit instantiation.
Douglas Gregor669eed82010-07-13 00:10:04 +00005648///
5649/// \returns true if a serious error occurs, false otherwise.
5650static bool CheckExplicitInstantiationScope(Sema &S, NamedDecl *D,
Douglas Gregor558c0322009-10-14 23:41:34 +00005651 SourceLocation InstLoc,
5652 bool WasQualifiedName) {
Sebastian Redl7a126a42010-08-31 00:36:30 +00005653 DeclContext *OrigContext= D->getDeclContext()->getEnclosingNamespaceContext();
5654 DeclContext *CurContext = S.CurContext->getRedeclContext();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005655
Douglas Gregor669eed82010-07-13 00:10:04 +00005656 if (CurContext->isRecord()) {
5657 S.Diag(InstLoc, diag::err_explicit_instantiation_in_class)
5658 << D;
5659 return true;
5660 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005661
Douglas Gregor558c0322009-10-14 23:41:34 +00005662 // C++0x [temp.explicit]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005663 // An explicit instantiation shall appear in an enclosing namespace of its
Douglas Gregor558c0322009-10-14 23:41:34 +00005664 // template.
5665 //
5666 // This is DR275, which we do not retroactively apply to C++98/03.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005667 if (S.getLangOptions().CPlusPlus0x &&
Sebastian Redl7a126a42010-08-31 00:36:30 +00005668 !CurContext->Encloses(OrigContext)) {
5669 if (NamespaceDecl *NS = dyn_cast<NamespaceDecl>(OrigContext))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005670 S.Diag(InstLoc,
5671 S.getLangOptions().CPlusPlus0x?
Douglas Gregor2166beb2010-05-11 17:39:34 +00005672 diag::err_explicit_instantiation_out_of_scope
5673 : diag::warn_explicit_instantiation_out_of_scope_0x)
Douglas Gregor558c0322009-10-14 23:41:34 +00005674 << D << NS;
5675 else
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005676 S.Diag(InstLoc,
Douglas Gregor2166beb2010-05-11 17:39:34 +00005677 S.getLangOptions().CPlusPlus0x?
5678 diag::err_explicit_instantiation_must_be_global
5679 : diag::warn_explicit_instantiation_out_of_scope_0x)
Douglas Gregor558c0322009-10-14 23:41:34 +00005680 << D;
5681 S.Diag(D->getLocation(), diag::note_explicit_instantiation_here);
Douglas Gregor669eed82010-07-13 00:10:04 +00005682 return false;
Douglas Gregor558c0322009-10-14 23:41:34 +00005683 }
Sebastian Redl7a126a42010-08-31 00:36:30 +00005684
Douglas Gregor558c0322009-10-14 23:41:34 +00005685 // C++0x [temp.explicit]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005686 // If the name declared in the explicit instantiation is an unqualified
5687 // name, the explicit instantiation shall appear in the namespace where
Douglas Gregor558c0322009-10-14 23:41:34 +00005688 // its template is declared or, if that namespace is inline (7.3.1), any
5689 // namespace from its enclosing namespace set.
5690 if (WasQualifiedName)
Douglas Gregor669eed82010-07-13 00:10:04 +00005691 return false;
Sebastian Redl7a126a42010-08-31 00:36:30 +00005692
5693 if (CurContext->InEnclosingNamespaceSetOf(OrigContext))
Douglas Gregor669eed82010-07-13 00:10:04 +00005694 return false;
Sebastian Redl7a126a42010-08-31 00:36:30 +00005695
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005696 S.Diag(InstLoc,
Douglas Gregor2166beb2010-05-11 17:39:34 +00005697 S.getLangOptions().CPlusPlus0x?
5698 diag::err_explicit_instantiation_unqualified_wrong_namespace
5699 : diag::warn_explicit_instantiation_unqualified_wrong_namespace_0x)
Sebastian Redl7a126a42010-08-31 00:36:30 +00005700 << D << OrigContext;
Douglas Gregor558c0322009-10-14 23:41:34 +00005701 S.Diag(D->getLocation(), diag::note_explicit_instantiation_here);
Douglas Gregor669eed82010-07-13 00:10:04 +00005702 return false;
Douglas Gregor558c0322009-10-14 23:41:34 +00005703}
5704
5705/// \brief Determine whether the given scope specifier has a template-id in it.
5706static bool ScopeSpecifierHasTemplateId(const CXXScopeSpec &SS) {
5707 if (!SS.isSet())
5708 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005709
Douglas Gregor558c0322009-10-14 23:41:34 +00005710 // C++0x [temp.explicit]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005711 // If the explicit instantiation is for a member function, a member class
Douglas Gregor558c0322009-10-14 23:41:34 +00005712 // or a static data member of a class template specialization, the name of
5713 // the class template specialization in the qualified-id for the member
5714 // name shall be a simple-template-id.
5715 //
5716 // C++98 has the same restriction, just worded differently.
5717 for (NestedNameSpecifier *NNS = (NestedNameSpecifier *)SS.getScopeRep();
5718 NNS; NNS = NNS->getPrefix())
John McCallf4c73712011-01-19 06:33:43 +00005719 if (const Type *T = NNS->getAsType())
Douglas Gregor558c0322009-10-14 23:41:34 +00005720 if (isa<TemplateSpecializationType>(T))
5721 return true;
5722
5723 return false;
5724}
5725
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00005726// Explicit instantiation of a class template specialization
John McCallf312b1e2010-08-26 23:41:50 +00005727DeclResult
Mike Stump1eb44332009-09-09 15:08:12 +00005728Sema::ActOnExplicitInstantiation(Scope *S,
Douglas Gregor45f96552009-09-04 06:33:52 +00005729 SourceLocation ExternLoc,
5730 SourceLocation TemplateLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00005731 unsigned TagSpec,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005732 SourceLocation KWLoc,
5733 const CXXScopeSpec &SS,
5734 TemplateTy TemplateD,
5735 SourceLocation TemplateNameLoc,
5736 SourceLocation LAngleLoc,
5737 ASTTemplateArgsPtr TemplateArgsIn,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005738 SourceLocation RAngleLoc,
5739 AttributeList *Attr) {
5740 // Find the class template we're specializing
5741 TemplateName Name = TemplateD.getAsVal<TemplateName>();
Mike Stump1eb44332009-09-09 15:08:12 +00005742 ClassTemplateDecl *ClassTemplate
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005743 = cast<ClassTemplateDecl>(Name.getAsTemplateDecl());
5744
5745 // Check that the specialization uses the same tag kind as the
5746 // original template.
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005747 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
5748 assert(Kind != TTK_Enum &&
5749 "Invalid enum tag in class template explicit instantiation!");
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005750 if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(),
Richard Trieubbf34c02011-06-10 03:11:26 +00005751 Kind, /*isDefinition*/false, KWLoc,
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005752 *ClassTemplate->getIdentifier())) {
Mike Stump1eb44332009-09-09 15:08:12 +00005753 Diag(KWLoc, diag::err_use_with_wrong_tag)
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005754 << ClassTemplate
Douglas Gregor849b2432010-03-31 17:46:05 +00005755 << FixItHint::CreateReplacement(KWLoc,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005756 ClassTemplate->getTemplatedDecl()->getKindName());
Mike Stump1eb44332009-09-09 15:08:12 +00005757 Diag(ClassTemplate->getTemplatedDecl()->getLocation(),
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005758 diag::note_previous_use);
5759 Kind = ClassTemplate->getTemplatedDecl()->getTagKind();
5760 }
5761
Douglas Gregor558c0322009-10-14 23:41:34 +00005762 // C++0x [temp.explicit]p2:
5763 // There are two forms of explicit instantiation: an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005764 // definition and an explicit instantiation declaration. An explicit
5765 // instantiation declaration begins with the extern keyword. [...]
Douglas Gregord5cb8762009-10-07 00:13:32 +00005766 TemplateSpecializationKind TSK
5767 = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition
5768 : TSK_ExplicitInstantiationDeclaration;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005769
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005770 // Translate the parser's template argument list in our AST format.
John McCalld5532b62009-11-23 01:53:49 +00005771 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
Douglas Gregor314b97f2009-11-10 19:49:08 +00005772 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005773
5774 // Check that the template argument list is well-formed for this
5775 // template.
Douglas Gregor910f8002010-11-07 23:05:16 +00005776 llvm::SmallVector<TemplateArgument, 4> Converted;
John McCalld5532b62009-11-23 01:53:49 +00005777 if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc,
5778 TemplateArgs, false, Converted))
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005779 return true;
5780
Douglas Gregor910f8002010-11-07 23:05:16 +00005781 assert((Converted.size() == ClassTemplate->getTemplateParameters()->size()) &&
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005782 "Converted template argument list is too short!");
Mike Stump1eb44332009-09-09 15:08:12 +00005783
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005784 // Find the class template specialization declaration that
5785 // corresponds to these arguments.
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005786 void *InsertPos = 0;
5787 ClassTemplateSpecializationDecl *PrevDecl
Douglas Gregor910f8002010-11-07 23:05:16 +00005788 = ClassTemplate->findSpecialization(Converted.data(),
5789 Converted.size(), InsertPos);
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005790
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005791 TemplateSpecializationKind PrevDecl_TSK
5792 = PrevDecl ? PrevDecl->getTemplateSpecializationKind() : TSK_Undeclared;
5793
Douglas Gregord5cb8762009-10-07 00:13:32 +00005794 // C++0x [temp.explicit]p2:
5795 // [...] An explicit instantiation shall appear in an enclosing
5796 // namespace of its template. [...]
5797 //
5798 // This is C++ DR 275.
Douglas Gregor669eed82010-07-13 00:10:04 +00005799 if (CheckExplicitInstantiationScope(*this, ClassTemplate, TemplateNameLoc,
5800 SS.isSet()))
5801 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005802
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005803 ClassTemplateSpecializationDecl *Specialization = 0;
5804
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005805 bool HasNoEffect = false;
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005806 if (PrevDecl) {
Douglas Gregor0d035142009-10-27 18:42:08 +00005807 if (CheckSpecializationInstantiationRedecl(TemplateNameLoc, TSK,
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005808 PrevDecl, PrevDecl_TSK,
Douglas Gregor89a5bea2009-10-15 22:53:21 +00005809 PrevDecl->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005810 HasNoEffect))
John McCalld226f652010-08-21 09:40:31 +00005811 return PrevDecl;
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005812
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005813 // Even though HasNoEffect == true means that this explicit instantiation
5814 // has no effect on semantics, we go on to put its syntax in the AST.
5815
5816 if (PrevDecl_TSK == TSK_ImplicitInstantiation ||
5817 PrevDecl_TSK == TSK_Undeclared) {
Douglas Gregor52604ab2009-09-11 21:19:12 +00005818 // Since the only prior class template specialization with these
5819 // arguments was referenced but not declared, reuse that
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005820 // declaration node as our own, updating the source location
5821 // for the template name to reflect our new declaration.
5822 // (Other source locations will be updated later.)
Douglas Gregor52604ab2009-09-11 21:19:12 +00005823 Specialization = PrevDecl;
5824 Specialization->setLocation(TemplateNameLoc);
5825 PrevDecl = 0;
5826 }
Douglas Gregor89a5bea2009-10-15 22:53:21 +00005827 }
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005828
Douglas Gregor52604ab2009-09-11 21:19:12 +00005829 if (!Specialization) {
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005830 // Create a new class template specialization declaration node for
5831 // this explicit specialization.
5832 Specialization
Douglas Gregor13c85772010-05-06 00:28:52 +00005833 = ClassTemplateSpecializationDecl::Create(Context, Kind,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005834 ClassTemplate->getDeclContext(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00005835 KWLoc, TemplateNameLoc,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005836 ClassTemplate,
Douglas Gregor910f8002010-11-07 23:05:16 +00005837 Converted.data(),
5838 Converted.size(),
5839 PrevDecl);
John McCallb6217662010-03-15 10:12:16 +00005840 SetNestedNameSpecifier(Specialization, SS);
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005841
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005842 if (!HasNoEffect && !PrevDecl) {
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005843 // Insert the new specialization.
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005844 ClassTemplate->AddSpecialization(Specialization, InsertPos);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005845 }
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005846 }
5847
5848 // Build the fully-sugared type for this explicit instantiation as
5849 // the user wrote in the explicit instantiation itself. This means
5850 // that we'll pretty-print the type retrieved from the
5851 // specialization's declaration the way that the user actually wrote
5852 // the explicit instantiation, rather than formatting the name based
5853 // on the "canonical" representation used to store the template
5854 // arguments in the specialization.
John McCall3cb0ebd2010-03-10 03:28:59 +00005855 TypeSourceInfo *WrittenTy
5856 = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc,
5857 TemplateArgs,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005858 Context.getTypeDeclType(Specialization));
5859 Specialization->setTypeAsWritten(WrittenTy);
5860 TemplateArgsIn.release();
5861
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005862 // Set source locations for keywords.
5863 Specialization->setExternLoc(ExternLoc);
5864 Specialization->setTemplateKeywordLoc(TemplateLoc);
5865
5866 // Add the explicit instantiation into its lexical context. However,
5867 // since explicit instantiations are never found by name lookup, we
5868 // just put it into the declaration context directly.
5869 Specialization->setLexicalDeclContext(CurContext);
5870 CurContext->addDecl(Specialization);
5871
5872 // Syntax is now OK, so return if it has no other effect on semantics.
5873 if (HasNoEffect) {
5874 // Set the template specialization kind.
5875 Specialization->setTemplateSpecializationKind(TSK);
John McCalld226f652010-08-21 09:40:31 +00005876 return Specialization;
Douglas Gregord78f5982009-11-25 06:01:46 +00005877 }
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005878
5879 // C++ [temp.explicit]p3:
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005880 // A definition of a class template or class member template
5881 // shall be in scope at the point of the explicit instantiation of
5882 // the class template or class member template.
5883 //
5884 // This check comes when we actually try to perform the
5885 // instantiation.
Douglas Gregor89a5bea2009-10-15 22:53:21 +00005886 ClassTemplateSpecializationDecl *Def
5887 = cast_or_null<ClassTemplateSpecializationDecl>(
Douglas Gregor952b0172010-02-11 01:04:33 +00005888 Specialization->getDefinition());
Douglas Gregor89a5bea2009-10-15 22:53:21 +00005889 if (!Def)
Douglas Gregor972e6ce2009-10-27 06:26:26 +00005890 InstantiateClassTemplateSpecialization(TemplateNameLoc, Specialization, TSK);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005891 else if (TSK == TSK_ExplicitInstantiationDefinition) {
Douglas Gregor6fb745b2010-05-13 16:44:06 +00005892 MarkVTableUsed(TemplateNameLoc, Specialization, true);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005893 Specialization->setPointOfInstantiation(Def->getPointOfInstantiation());
5894 }
Douglas Gregor6fb745b2010-05-13 16:44:06 +00005895
Douglas Gregor0d035142009-10-27 18:42:08 +00005896 // Instantiate the members of this class template specialization.
5897 Def = cast_or_null<ClassTemplateSpecializationDecl>(
Douglas Gregor952b0172010-02-11 01:04:33 +00005898 Specialization->getDefinition());
Rafael Espindolab0f65ca2010-03-22 23:12:48 +00005899 if (Def) {
Rafael Espindolaf075b222010-03-23 19:55:22 +00005900 TemplateSpecializationKind Old_TSK = Def->getTemplateSpecializationKind();
5901
5902 // Fix a TSK_ExplicitInstantiationDeclaration followed by a
5903 // TSK_ExplicitInstantiationDefinition
5904 if (Old_TSK == TSK_ExplicitInstantiationDeclaration &&
5905 TSK == TSK_ExplicitInstantiationDefinition)
5906 Def->setTemplateSpecializationKind(TSK);
Rafael Espindolab0f65ca2010-03-22 23:12:48 +00005907
Douglas Gregor89a5bea2009-10-15 22:53:21 +00005908 InstantiateClassTemplateSpecializationMembers(TemplateNameLoc, Def, TSK);
Rafael Espindolab0f65ca2010-03-22 23:12:48 +00005909 }
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005910
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005911 // Set the template specialization kind.
5912 Specialization->setTemplateSpecializationKind(TSK);
John McCalld226f652010-08-21 09:40:31 +00005913 return Specialization;
Douglas Gregor93dfdb12009-05-13 00:25:59 +00005914}
5915
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00005916// Explicit instantiation of a member class of a class template.
John McCalld226f652010-08-21 09:40:31 +00005917DeclResult
Mike Stump1eb44332009-09-09 15:08:12 +00005918Sema::ActOnExplicitInstantiation(Scope *S,
Douglas Gregor45f96552009-09-04 06:33:52 +00005919 SourceLocation ExternLoc,
5920 SourceLocation TemplateLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00005921 unsigned TagSpec,
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00005922 SourceLocation KWLoc,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00005923 CXXScopeSpec &SS,
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00005924 IdentifierInfo *Name,
5925 SourceLocation NameLoc,
5926 AttributeList *Attr) {
5927
Douglas Gregor402abb52009-05-28 23:31:59 +00005928 bool Owned = false;
John McCallc4e70192009-09-11 04:59:25 +00005929 bool IsDependent = false;
John McCallf312b1e2010-08-26 23:41:50 +00005930 Decl *TagD = ActOnTag(S, TagSpec, Sema::TUK_Reference,
John McCalld226f652010-08-21 09:40:31 +00005931 KWLoc, SS, Name, NameLoc, Attr, AS_none,
5932 MultiTemplateParamsArg(*this, 0, 0),
Abramo Bagnaraa88cefd2010-12-03 18:54:17 +00005933 Owned, IsDependent, false, false,
Douglas Gregor1274ccd2010-10-08 23:50:27 +00005934 TypeResult());
John McCallc4e70192009-09-11 04:59:25 +00005935 assert(!IsDependent && "explicit instantiation of dependent name not yet handled");
5936
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00005937 if (!TagD)
5938 return true;
5939
John McCalld226f652010-08-21 09:40:31 +00005940 TagDecl *Tag = cast<TagDecl>(TagD);
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00005941 if (Tag->isEnum()) {
5942 Diag(TemplateLoc, diag::err_explicit_instantiation_enum)
5943 << Context.getTypeDeclType(Tag);
5944 return true;
5945 }
5946
Douglas Gregord0c87372009-05-27 17:30:49 +00005947 if (Tag->isInvalidDecl())
5948 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005949
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00005950 CXXRecordDecl *Record = cast<CXXRecordDecl>(Tag);
5951 CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass();
5952 if (!Pattern) {
5953 Diag(TemplateLoc, diag::err_explicit_instantiation_nontemplate_type)
5954 << Context.getTypeDeclType(Record);
5955 Diag(Record->getLocation(), diag::note_nontemplate_decl_here);
5956 return true;
5957 }
5958
Douglas Gregor558c0322009-10-14 23:41:34 +00005959 // C++0x [temp.explicit]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005960 // If the explicit instantiation is for a class or member class, the
5961 // elaborated-type-specifier in the declaration shall include a
Douglas Gregor558c0322009-10-14 23:41:34 +00005962 // simple-template-id.
5963 //
5964 // C++98 has the same restriction, just worded differently.
5965 if (!ScopeSpecifierHasTemplateId(SS))
Douglas Gregora2dd8282010-06-16 16:26:47 +00005966 Diag(TemplateLoc, diag::ext_explicit_instantiation_without_qualified_id)
Douglas Gregor558c0322009-10-14 23:41:34 +00005967 << Record << SS.getRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005968
Douglas Gregor558c0322009-10-14 23:41:34 +00005969 // C++0x [temp.explicit]p2:
5970 // There are two forms of explicit instantiation: an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005971 // definition and an explicit instantiation declaration. An explicit
Douglas Gregor558c0322009-10-14 23:41:34 +00005972 // instantiation declaration begins with the extern keyword. [...]
Douglas Gregora74bbe22009-10-14 21:46:58 +00005973 TemplateSpecializationKind TSK
5974 = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition
5975 : TSK_ExplicitInstantiationDeclaration;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005976
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00005977 // C++0x [temp.explicit]p2:
5978 // [...] An explicit instantiation shall appear in an enclosing
5979 // namespace of its template. [...]
5980 //
5981 // This is C++ DR 275.
Douglas Gregor558c0322009-10-14 23:41:34 +00005982 CheckExplicitInstantiationScope(*this, Record, NameLoc, true);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005983
Douglas Gregor454885e2009-10-15 15:54:05 +00005984 // Verify that it is okay to explicitly instantiate here.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005985 CXXRecordDecl *PrevDecl
Douglas Gregor583f33b2009-10-15 18:07:02 +00005986 = cast_or_null<CXXRecordDecl>(Record->getPreviousDeclaration());
Douglas Gregor952b0172010-02-11 01:04:33 +00005987 if (!PrevDecl && Record->getDefinition())
Douglas Gregor583f33b2009-10-15 18:07:02 +00005988 PrevDecl = Record;
5989 if (PrevDecl) {
Douglas Gregor454885e2009-10-15 15:54:05 +00005990 MemberSpecializationInfo *MSInfo = PrevDecl->getMemberSpecializationInfo();
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005991 bool HasNoEffect = false;
Douglas Gregor454885e2009-10-15 15:54:05 +00005992 assert(MSInfo && "No member specialization information?");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005993 if (CheckSpecializationInstantiationRedecl(TemplateLoc, TSK,
Douglas Gregor454885e2009-10-15 15:54:05 +00005994 PrevDecl,
5995 MSInfo->getTemplateSpecializationKind(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005996 MSInfo->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005997 HasNoEffect))
Douglas Gregor454885e2009-10-15 15:54:05 +00005998 return true;
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005999 if (HasNoEffect)
Douglas Gregor454885e2009-10-15 15:54:05 +00006000 return TagD;
6001 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006002
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006003 CXXRecordDecl *RecordDef
Douglas Gregor952b0172010-02-11 01:04:33 +00006004 = cast_or_null<CXXRecordDecl>(Record->getDefinition());
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006005 if (!RecordDef) {
Douglas Gregorbf7643e2009-10-15 12:53:22 +00006006 // C++ [temp.explicit]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006007 // A definition of a member class of a class template shall be in scope
Douglas Gregorbf7643e2009-10-15 12:53:22 +00006008 // at the point of an explicit instantiation of the member class.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006009 CXXRecordDecl *Def
Douglas Gregor952b0172010-02-11 01:04:33 +00006010 = cast_or_null<CXXRecordDecl>(Pattern->getDefinition());
Douglas Gregorbf7643e2009-10-15 12:53:22 +00006011 if (!Def) {
Douglas Gregore2d3a3d2009-10-15 14:05:49 +00006012 Diag(TemplateLoc, diag::err_explicit_instantiation_undefined_member)
6013 << 0 << Record->getDeclName() << Record->getDeclContext();
Douglas Gregorbf7643e2009-10-15 12:53:22 +00006014 Diag(Pattern->getLocation(), diag::note_forward_declaration)
6015 << Pattern;
6016 return true;
Douglas Gregor0d035142009-10-27 18:42:08 +00006017 } else {
6018 if (InstantiateClass(NameLoc, Record, Def,
6019 getTemplateInstantiationArgs(Record),
6020 TSK))
6021 return true;
6022
Douglas Gregor952b0172010-02-11 01:04:33 +00006023 RecordDef = cast_or_null<CXXRecordDecl>(Record->getDefinition());
Douglas Gregor0d035142009-10-27 18:42:08 +00006024 if (!RecordDef)
6025 return true;
6026 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006027 }
6028
Douglas Gregor0d035142009-10-27 18:42:08 +00006029 // Instantiate all of the members of the class.
6030 InstantiateClassMembers(NameLoc, RecordDef,
6031 getTemplateInstantiationArgs(Record), TSK);
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006032
Douglas Gregor6fb745b2010-05-13 16:44:06 +00006033 if (TSK == TSK_ExplicitInstantiationDefinition)
6034 MarkVTableUsed(NameLoc, RecordDef, true);
6035
Mike Stump390b4cc2009-05-16 07:39:55 +00006036 // FIXME: We don't have any representation for explicit instantiations of
6037 // member classes. Such a representation is not needed for compilation, but it
6038 // should be available for clients that want to see all of the declarations in
6039 // the source code.
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006040 return TagD;
6041}
6042
John McCallf312b1e2010-08-26 23:41:50 +00006043DeclResult Sema::ActOnExplicitInstantiation(Scope *S,
6044 SourceLocation ExternLoc,
6045 SourceLocation TemplateLoc,
6046 Declarator &D) {
Douglas Gregord5a423b2009-09-25 18:43:00 +00006047 // Explicit instantiations always require a name.
Abramo Bagnara25777432010-08-11 22:01:17 +00006048 // TODO: check if/when DNInfo should replace Name.
6049 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
6050 DeclarationName Name = NameInfo.getName();
Douglas Gregord5a423b2009-09-25 18:43:00 +00006051 if (!Name) {
6052 if (!D.isInvalidType())
6053 Diag(D.getDeclSpec().getSourceRange().getBegin(),
6054 diag::err_explicit_instantiation_requires_name)
6055 << D.getDeclSpec().getSourceRange()
6056 << D.getSourceRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006057
Douglas Gregord5a423b2009-09-25 18:43:00 +00006058 return true;
6059 }
6060
6061 // The scope passed in may not be a decl scope. Zip up the scope tree until
6062 // we find one that is.
6063 while ((S->getFlags() & Scope::DeclScope) == 0 ||
6064 (S->getFlags() & Scope::TemplateParamScope) != 0)
6065 S = S->getParent();
6066
6067 // Determine the type of the declaration.
John McCallbf1a0282010-06-04 23:28:52 +00006068 TypeSourceInfo *T = GetTypeForDeclarator(D, S);
6069 QualType R = T->getType();
Douglas Gregord5a423b2009-09-25 18:43:00 +00006070 if (R.isNull())
6071 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006072
Douglas Gregore885e182011-05-21 18:53:30 +00006073 // C++ [dcl.stc]p1:
6074 // A storage-class-specifier shall not be specified in [...] an explicit
6075 // instantiation (14.7.2) directive.
Douglas Gregord5a423b2009-09-25 18:43:00 +00006076 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
Douglas Gregord5a423b2009-09-25 18:43:00 +00006077 Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_of_typedef)
6078 << Name;
6079 return true;
Douglas Gregore885e182011-05-21 18:53:30 +00006080 } else if (D.getDeclSpec().getStorageClassSpec()
6081 != DeclSpec::SCS_unspecified) {
6082 // Complain about then remove the storage class specifier.
6083 Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_storage_class)
6084 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
6085
6086 D.getMutableDeclSpec().ClearStorageClassSpecs();
Douglas Gregord5a423b2009-09-25 18:43:00 +00006087 }
6088
Douglas Gregor663b5a02009-10-14 20:14:33 +00006089 // C++0x [temp.explicit]p1:
6090 // [...] An explicit instantiation of a function template shall not use the
6091 // inline or constexpr specifiers.
6092 // Presumably, this also applies to member functions of class templates as
6093 // well.
6094 if (D.getDeclSpec().isInlineSpecified() && getLangOptions().CPlusPlus0x)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006095 Diag(D.getDeclSpec().getInlineSpecLoc(),
Douglas Gregor663b5a02009-10-14 20:14:33 +00006096 diag::err_explicit_instantiation_inline)
Douglas Gregor849b2432010-03-31 17:46:05 +00006097 <<FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006098
Douglas Gregor663b5a02009-10-14 20:14:33 +00006099 // FIXME: check for constexpr specifier.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006100
Douglas Gregor558c0322009-10-14 23:41:34 +00006101 // C++0x [temp.explicit]p2:
6102 // There are two forms of explicit instantiation: an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006103 // definition and an explicit instantiation declaration. An explicit
6104 // instantiation declaration begins with the extern keyword. [...]
Douglas Gregord5a423b2009-09-25 18:43:00 +00006105 TemplateSpecializationKind TSK
6106 = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition
6107 : TSK_ExplicitInstantiationDeclaration;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006108
Abramo Bagnara25777432010-08-11 22:01:17 +00006109 LookupResult Previous(*this, NameInfo, LookupOrdinaryName);
John McCalla24dc2e2009-11-17 02:14:36 +00006110 LookupParsedName(Previous, S, &D.getCXXScopeSpec());
Douglas Gregord5a423b2009-09-25 18:43:00 +00006111
6112 if (!R->isFunctionType()) {
6113 // C++ [temp.explicit]p1:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006114 // A [...] static data member of a class template can be explicitly
6115 // instantiated from the member definition associated with its class
Douglas Gregord5a423b2009-09-25 18:43:00 +00006116 // template.
John McCalla24dc2e2009-11-17 02:14:36 +00006117 if (Previous.isAmbiguous())
6118 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006119
John McCall1bcee0a2009-12-02 08:25:40 +00006120 VarDecl *Prev = Previous.getAsSingle<VarDecl>();
Douglas Gregord5a423b2009-09-25 18:43:00 +00006121 if (!Prev || !Prev->isStaticDataMember()) {
6122 // We expect to see a data data member here.
6123 Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_not_known)
6124 << Name;
6125 for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end();
6126 P != PEnd; ++P)
John McCallf36e02d2009-10-09 21:13:30 +00006127 Diag((*P)->getLocation(), diag::note_explicit_instantiation_here);
Douglas Gregord5a423b2009-09-25 18:43:00 +00006128 return true;
6129 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006130
Douglas Gregord5a423b2009-09-25 18:43:00 +00006131 if (!Prev->getInstantiatedFromStaticDataMember()) {
6132 // FIXME: Check for explicit specialization?
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006133 Diag(D.getIdentifierLoc(),
Douglas Gregord5a423b2009-09-25 18:43:00 +00006134 diag::err_explicit_instantiation_data_member_not_instantiated)
6135 << Prev;
6136 Diag(Prev->getLocation(), diag::note_explicit_instantiation_here);
6137 // FIXME: Can we provide a note showing where this was declared?
6138 return true;
6139 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006140
Douglas Gregor558c0322009-10-14 23:41:34 +00006141 // C++0x [temp.explicit]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006142 // If the explicit instantiation is for a member function, a member class
Douglas Gregor558c0322009-10-14 23:41:34 +00006143 // or a static data member of a class template specialization, the name of
6144 // the class template specialization in the qualified-id for the member
6145 // name shall be a simple-template-id.
6146 //
6147 // C++98 has the same restriction, just worded differently.
6148 if (!ScopeSpecifierHasTemplateId(D.getCXXScopeSpec()))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006149 Diag(D.getIdentifierLoc(),
Douglas Gregora2dd8282010-06-16 16:26:47 +00006150 diag::ext_explicit_instantiation_without_qualified_id)
Douglas Gregor558c0322009-10-14 23:41:34 +00006151 << Prev << D.getCXXScopeSpec().getRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006152
Douglas Gregor558c0322009-10-14 23:41:34 +00006153 // Check the scope of this explicit instantiation.
6154 CheckExplicitInstantiationScope(*this, Prev, D.getIdentifierLoc(), true);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006155
Douglas Gregor454885e2009-10-15 15:54:05 +00006156 // Verify that it is okay to explicitly instantiate here.
6157 MemberSpecializationInfo *MSInfo = Prev->getMemberSpecializationInfo();
6158 assert(MSInfo && "Missing static data member specialization info?");
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006159 bool HasNoEffect = false;
Douglas Gregor0d035142009-10-27 18:42:08 +00006160 if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK, Prev,
Douglas Gregor454885e2009-10-15 15:54:05 +00006161 MSInfo->getTemplateSpecializationKind(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006162 MSInfo->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006163 HasNoEffect))
Douglas Gregor454885e2009-10-15 15:54:05 +00006164 return true;
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006165 if (HasNoEffect)
John McCalld226f652010-08-21 09:40:31 +00006166 return (Decl*) 0;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006167
Douglas Gregord5a423b2009-09-25 18:43:00 +00006168 // Instantiate static data member.
Douglas Gregor0a897e32009-10-15 17:21:20 +00006169 Prev->setTemplateSpecializationKind(TSK, D.getIdentifierLoc());
Douglas Gregord5a423b2009-09-25 18:43:00 +00006170 if (TSK == TSK_ExplicitInstantiationDefinition)
Chandler Carruth58e390e2010-08-25 08:27:02 +00006171 InstantiateStaticDataMemberDefinition(D.getIdentifierLoc(), Prev);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006172
Douglas Gregord5a423b2009-09-25 18:43:00 +00006173 // FIXME: Create an ExplicitInstantiation node?
John McCalld226f652010-08-21 09:40:31 +00006174 return (Decl*) 0;
Douglas Gregord5a423b2009-09-25 18:43:00 +00006175 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006176
6177 // If the declarator is a template-id, translate the parser's template
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00006178 // argument list into our AST format.
Douglas Gregordb422df2009-09-25 21:45:23 +00006179 bool HasExplicitTemplateArgs = false;
John McCalld5532b62009-11-23 01:53:49 +00006180 TemplateArgumentListInfo TemplateArgs;
Douglas Gregor3f9a0562009-11-03 01:35:08 +00006181 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
6182 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
John McCalld5532b62009-11-23 01:53:49 +00006183 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
6184 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
Douglas Gregordb422df2009-09-25 21:45:23 +00006185 ASTTemplateArgsPtr TemplateArgsPtr(*this,
6186 TemplateId->getTemplateArgs(),
Douglas Gregordb422df2009-09-25 21:45:23 +00006187 TemplateId->NumArgs);
John McCalld5532b62009-11-23 01:53:49 +00006188 translateTemplateArguments(TemplateArgsPtr, TemplateArgs);
Douglas Gregordb422df2009-09-25 21:45:23 +00006189 HasExplicitTemplateArgs = true;
Douglas Gregorb2f81cf2009-10-01 23:51:25 +00006190 TemplateArgsPtr.release();
Douglas Gregordb422df2009-09-25 21:45:23 +00006191 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006192
Douglas Gregord5a423b2009-09-25 18:43:00 +00006193 // C++ [temp.explicit]p1:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006194 // A [...] function [...] can be explicitly instantiated from its template.
6195 // A member function [...] of a class template can be explicitly
6196 // instantiated from the member definition associated with its class
Douglas Gregord5a423b2009-09-25 18:43:00 +00006197 // template.
John McCallc373d482010-01-27 01:50:18 +00006198 UnresolvedSet<8> Matches;
Douglas Gregord5a423b2009-09-25 18:43:00 +00006199 for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end();
6200 P != PEnd; ++P) {
6201 NamedDecl *Prev = *P;
Douglas Gregordb422df2009-09-25 21:45:23 +00006202 if (!HasExplicitTemplateArgs) {
6203 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Prev)) {
6204 if (Context.hasSameUnqualifiedType(Method->getType(), R)) {
6205 Matches.clear();
Douglas Gregor48026d22010-01-11 18:40:55 +00006206
John McCallc373d482010-01-27 01:50:18 +00006207 Matches.addDecl(Method, P.getAccess());
Douglas Gregor48026d22010-01-11 18:40:55 +00006208 if (Method->getTemplateSpecializationKind() == TSK_Undeclared)
6209 break;
Douglas Gregordb422df2009-09-25 21:45:23 +00006210 }
Douglas Gregord5a423b2009-09-25 18:43:00 +00006211 }
6212 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006213
Douglas Gregord5a423b2009-09-25 18:43:00 +00006214 FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Prev);
6215 if (!FunTmpl)
6216 continue;
6217
John McCall5769d612010-02-08 23:07:23 +00006218 TemplateDeductionInfo Info(Context, D.getIdentifierLoc());
Douglas Gregord5a423b2009-09-25 18:43:00 +00006219 FunctionDecl *Specialization = 0;
6220 if (TemplateDeductionResult TDK
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006221 = DeduceTemplateArguments(FunTmpl,
John McCalld5532b62009-11-23 01:53:49 +00006222 (HasExplicitTemplateArgs ? &TemplateArgs : 0),
Douglas Gregord5a423b2009-09-25 18:43:00 +00006223 R, Specialization, Info)) {
6224 // FIXME: Keep track of almost-matches?
6225 (void)TDK;
6226 continue;
6227 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006228
John McCallc373d482010-01-27 01:50:18 +00006229 Matches.addDecl(Specialization, P.getAccess());
Douglas Gregord5a423b2009-09-25 18:43:00 +00006230 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006231
Douglas Gregord5a423b2009-09-25 18:43:00 +00006232 // Find the most specialized function template specialization.
John McCallc373d482010-01-27 01:50:18 +00006233 UnresolvedSetIterator Result
Douglas Gregor5c7bf422011-01-11 17:34:58 +00006234 = getMostSpecialized(Matches.begin(), Matches.end(), TPOC_Other, 0,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006235 D.getIdentifierLoc(),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00006236 PDiag(diag::err_explicit_instantiation_not_known) << Name,
6237 PDiag(diag::err_explicit_instantiation_ambiguous) << Name,
6238 PDiag(diag::note_explicit_instantiation_candidate));
Douglas Gregord5a423b2009-09-25 18:43:00 +00006239
John McCallc373d482010-01-27 01:50:18 +00006240 if (Result == Matches.end())
Douglas Gregord5a423b2009-09-25 18:43:00 +00006241 return true;
John McCallc373d482010-01-27 01:50:18 +00006242
6243 // Ignore access control bits, we don't need them for redeclaration checking.
6244 FunctionDecl *Specialization = cast<FunctionDecl>(*Result);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006245
Douglas Gregor0a897e32009-10-15 17:21:20 +00006246 if (Specialization->getTemplateSpecializationKind() == TSK_Undeclared) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006247 Diag(D.getIdentifierLoc(),
Douglas Gregord5a423b2009-09-25 18:43:00 +00006248 diag::err_explicit_instantiation_member_function_not_instantiated)
6249 << Specialization
6250 << (Specialization->getTemplateSpecializationKind() ==
6251 TSK_ExplicitSpecialization);
6252 Diag(Specialization->getLocation(), diag::note_explicit_instantiation_here);
6253 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006254 }
6255
Douglas Gregor0a897e32009-10-15 17:21:20 +00006256 FunctionDecl *PrevDecl = Specialization->getPreviousDeclaration();
Douglas Gregor583f33b2009-10-15 18:07:02 +00006257 if (!PrevDecl && Specialization->isThisDeclarationADefinition())
6258 PrevDecl = Specialization;
6259
Douglas Gregor0a897e32009-10-15 17:21:20 +00006260 if (PrevDecl) {
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006261 bool HasNoEffect = false;
Douglas Gregor0d035142009-10-27 18:42:08 +00006262 if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006263 PrevDecl,
6264 PrevDecl->getTemplateSpecializationKind(),
Douglas Gregor0a897e32009-10-15 17:21:20 +00006265 PrevDecl->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006266 HasNoEffect))
Douglas Gregor0a897e32009-10-15 17:21:20 +00006267 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006268
Douglas Gregor0a897e32009-10-15 17:21:20 +00006269 // FIXME: We may still want to build some representation of this
6270 // explicit specialization.
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006271 if (HasNoEffect)
John McCalld226f652010-08-21 09:40:31 +00006272 return (Decl*) 0;
Douglas Gregor0a897e32009-10-15 17:21:20 +00006273 }
Anders Carlsson26d6e9d2009-11-24 05:34:41 +00006274
6275 Specialization->setTemplateSpecializationKind(TSK, D.getIdentifierLoc());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006276
Douglas Gregor0a897e32009-10-15 17:21:20 +00006277 if (TSK == TSK_ExplicitInstantiationDefinition)
Chandler Carruth58e390e2010-08-25 08:27:02 +00006278 InstantiateFunctionDefinition(D.getIdentifierLoc(), Specialization);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006279
Douglas Gregor558c0322009-10-14 23:41:34 +00006280 // C++0x [temp.explicit]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006281 // If the explicit instantiation is for a member function, a member class
Douglas Gregor558c0322009-10-14 23:41:34 +00006282 // or a static data member of a class template specialization, the name of
6283 // the class template specialization in the qualified-id for the member
6284 // name shall be a simple-template-id.
6285 //
6286 // C++98 has the same restriction, just worded differently.
Douglas Gregor0a897e32009-10-15 17:21:20 +00006287 FunctionTemplateDecl *FunTmpl = Specialization->getPrimaryTemplate();
Douglas Gregor3f9a0562009-11-03 01:35:08 +00006288 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId && !FunTmpl &&
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006289 D.getCXXScopeSpec().isSet() &&
Douglas Gregor558c0322009-10-14 23:41:34 +00006290 !ScopeSpecifierHasTemplateId(D.getCXXScopeSpec()))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006291 Diag(D.getIdentifierLoc(),
Douglas Gregora2dd8282010-06-16 16:26:47 +00006292 diag::ext_explicit_instantiation_without_qualified_id)
Douglas Gregor558c0322009-10-14 23:41:34 +00006293 << Specialization << D.getCXXScopeSpec().getRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006294
Douglas Gregor558c0322009-10-14 23:41:34 +00006295 CheckExplicitInstantiationScope(*this,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006296 FunTmpl? (NamedDecl *)FunTmpl
Douglas Gregor558c0322009-10-14 23:41:34 +00006297 : Specialization->getInstantiatedFromMemberFunction(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006298 D.getIdentifierLoc(),
Douglas Gregor558c0322009-10-14 23:41:34 +00006299 D.getCXXScopeSpec().isSet());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006300
Douglas Gregord5a423b2009-09-25 18:43:00 +00006301 // FIXME: Create some kind of ExplicitInstantiationDecl here.
John McCalld226f652010-08-21 09:40:31 +00006302 return (Decl*) 0;
Douglas Gregord5a423b2009-09-25 18:43:00 +00006303}
6304
John McCallf312b1e2010-08-26 23:41:50 +00006305TypeResult
John McCallc4e70192009-09-11 04:59:25 +00006306Sema::ActOnDependentTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
6307 const CXXScopeSpec &SS, IdentifierInfo *Name,
6308 SourceLocation TagLoc, SourceLocation NameLoc) {
6309 // This has to hold, because SS is expected to be defined.
6310 assert(Name && "Expected a name in a dependent tag");
6311
6312 NestedNameSpecifier *NNS
6313 = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
6314 if (!NNS)
6315 return true;
6316
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006317 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
Daniel Dunbar12c0ade2010-04-01 16:50:48 +00006318
Douglas Gregor48c89f42010-04-24 16:38:41 +00006319 if (TUK == TUK_Declaration || TUK == TUK_Definition) {
6320 Diag(NameLoc, diag::err_dependent_tag_decl)
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006321 << (TUK == TUK_Definition) << Kind << SS.getRange();
Douglas Gregor48c89f42010-04-24 16:38:41 +00006322 return true;
6323 }
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006324
Douglas Gregor059101f2011-03-02 00:47:37 +00006325 // Create the resulting type.
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006326 ElaboratedTypeKeyword Kwd = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
Douglas Gregor059101f2011-03-02 00:47:37 +00006327 QualType Result = Context.getDependentNameType(Kwd, NNS, Name);
6328
6329 // Create type-source location information for this type.
6330 TypeLocBuilder TLB;
6331 DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(Result);
6332 TL.setKeywordLoc(TagLoc);
6333 TL.setQualifierLoc(SS.getWithLocInContext(Context));
6334 TL.setNameLoc(NameLoc);
6335 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
John McCallc4e70192009-09-11 04:59:25 +00006336}
6337
John McCallf312b1e2010-08-26 23:41:50 +00006338TypeResult
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006339Sema::ActOnTypenameType(Scope *S, SourceLocation TypenameLoc,
6340 const CXXScopeSpec &SS, const IdentifierInfo &II,
Douglas Gregor1a15dae2010-06-16 22:31:08 +00006341 SourceLocation IdLoc) {
Douglas Gregore29425b2011-02-28 22:42:13 +00006342 if (SS.isInvalid())
Douglas Gregord57959a2009-03-27 23:10:48 +00006343 return true;
Douglas Gregore29425b2011-02-28 22:42:13 +00006344
Douglas Gregor1a15dae2010-06-16 22:31:08 +00006345 if (TypenameLoc.isValid() && S && !S->getTemplateParamParent() &&
6346 !getLangOptions().CPlusPlus0x)
6347 Diag(TypenameLoc, diag::ext_typename_outside_of_template)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006348 << FixItHint::CreateRemoval(TypenameLoc);
6349
Douglas Gregor2494dd02011-03-01 01:34:45 +00006350 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
Douglas Gregor9e876872011-03-01 18:12:44 +00006351 QualType T = CheckTypenameType(TypenameLoc.isValid()? ETK_Typename : ETK_None,
6352 TypenameLoc, QualifierLoc, II, IdLoc);
Douglas Gregor31a19b62009-04-01 21:51:26 +00006353 if (T.isNull())
6354 return true;
John McCall63b43852010-04-29 23:50:39 +00006355
6356 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
6357 if (isa<DependentNameType>(T)) {
6358 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc());
John McCall4e449832010-05-28 23:32:21 +00006359 TL.setKeywordLoc(TypenameLoc);
Douglas Gregor2494dd02011-03-01 01:34:45 +00006360 TL.setQualifierLoc(QualifierLoc);
John McCall4e449832010-05-28 23:32:21 +00006361 TL.setNameLoc(IdLoc);
John McCall63b43852010-04-29 23:50:39 +00006362 } else {
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006363 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc());
John McCall4e449832010-05-28 23:32:21 +00006364 TL.setKeywordLoc(TypenameLoc);
Douglas Gregor9e876872011-03-01 18:12:44 +00006365 TL.setQualifierLoc(QualifierLoc);
John McCall4e449832010-05-28 23:32:21 +00006366 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(IdLoc);
John McCall63b43852010-04-29 23:50:39 +00006367 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006368
John McCallb3d87482010-08-24 05:47:05 +00006369 return CreateParsedType(T, TSI);
Douglas Gregord57959a2009-03-27 23:10:48 +00006370}
6371
John McCallf312b1e2010-08-26 23:41:50 +00006372TypeResult
Douglas Gregora02411e2011-02-27 22:46:49 +00006373Sema::ActOnTypenameType(Scope *S, SourceLocation TypenameLoc,
6374 const CXXScopeSpec &SS,
6375 SourceLocation TemplateLoc,
6376 TemplateTy TemplateIn,
6377 SourceLocation TemplateNameLoc,
6378 SourceLocation LAngleLoc,
6379 ASTTemplateArgsPtr TemplateArgsIn,
6380 SourceLocation RAngleLoc) {
Douglas Gregor1a15dae2010-06-16 22:31:08 +00006381 if (TypenameLoc.isValid() && S && !S->getTemplateParamParent() &&
6382 !getLangOptions().CPlusPlus0x)
6383 Diag(TypenameLoc, diag::ext_typename_outside_of_template)
Douglas Gregora02411e2011-02-27 22:46:49 +00006384 << FixItHint::CreateRemoval(TypenameLoc);
6385
6386 // Translate the parser's template argument list in our AST format.
6387 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
6388 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
6389
6390 TemplateName Template = TemplateIn.get();
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006391 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
6392 // Construct a dependent template specialization type.
6393 assert(DTN && "dependent template has non-dependent name?");
6394 assert(DTN->getQualifier()
6395 == static_cast<NestedNameSpecifier*>(SS.getScopeRep()));
6396 QualType T = Context.getDependentTemplateSpecializationType(ETK_Typename,
6397 DTN->getQualifier(),
6398 DTN->getIdentifier(),
6399 TemplateArgs);
Douglas Gregora02411e2011-02-27 22:46:49 +00006400
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006401 // Create source-location information for this type.
John McCall4e449832010-05-28 23:32:21 +00006402 TypeLocBuilder Builder;
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006403 DependentTemplateSpecializationTypeLoc SpecTL
6404 = Builder.push<DependentTemplateSpecializationTypeLoc>(T);
Douglas Gregora02411e2011-02-27 22:46:49 +00006405 SpecTL.setLAngleLoc(LAngleLoc);
6406 SpecTL.setRAngleLoc(RAngleLoc);
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006407 SpecTL.setKeywordLoc(TypenameLoc);
Douglas Gregor94fdffa2011-03-01 20:11:18 +00006408 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006409 SpecTL.setNameLoc(TemplateNameLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00006410 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
6411 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006412 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
Douglas Gregor6946baf2009-09-02 13:05:45 +00006413 }
Douglas Gregora02411e2011-02-27 22:46:49 +00006414
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006415 QualType T = CheckTemplateIdType(Template, TemplateNameLoc, TemplateArgs);
6416 if (T.isNull())
6417 return true;
Douglas Gregora02411e2011-02-27 22:46:49 +00006418
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006419 // Provide source-location information for the template specialization
6420 // type.
Douglas Gregora02411e2011-02-27 22:46:49 +00006421 TypeLocBuilder Builder;
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006422 TemplateSpecializationTypeLoc SpecTL
6423 = Builder.push<TemplateSpecializationTypeLoc>(T);
6424
6425 // FIXME: No place to set the location of the 'template' keyword!
Douglas Gregora02411e2011-02-27 22:46:49 +00006426 SpecTL.setLAngleLoc(LAngleLoc);
6427 SpecTL.setRAngleLoc(RAngleLoc);
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006428 SpecTL.setTemplateNameLoc(TemplateNameLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00006429 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
6430 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
6431
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006432 T = Context.getElaboratedType(ETK_Typename, SS.getScopeRep(), T);
6433 ElaboratedTypeLoc TL = Builder.push<ElaboratedTypeLoc>(T);
6434 TL.setKeywordLoc(TypenameLoc);
Douglas Gregor9e876872011-03-01 18:12:44 +00006435 TL.setQualifierLoc(SS.getWithLocInContext(Context));
6436
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006437 TypeSourceInfo *TSI = Builder.getTypeSourceInfo(Context, T);
6438 return CreateParsedType(T, TSI);
Douglas Gregor17343172009-04-01 00:28:59 +00006439}
6440
Douglas Gregora02411e2011-02-27 22:46:49 +00006441
Douglas Gregord57959a2009-03-27 23:10:48 +00006442/// \brief Build the type that describes a C++ typename specifier,
6443/// e.g., "typename T::type".
6444QualType
Douglas Gregore29425b2011-02-28 22:42:13 +00006445Sema::CheckTypenameType(ElaboratedTypeKeyword Keyword,
6446 SourceLocation KeywordLoc,
6447 NestedNameSpecifierLoc QualifierLoc,
6448 const IdentifierInfo &II,
Abramo Bagnarae4da7a02010-05-19 21:37:53 +00006449 SourceLocation IILoc) {
John McCall77bb1aa2010-05-01 00:40:08 +00006450 CXXScopeSpec SS;
Douglas Gregore29425b2011-02-28 22:42:13 +00006451 SS.Adopt(QualifierLoc);
Douglas Gregord57959a2009-03-27 23:10:48 +00006452
John McCall77bb1aa2010-05-01 00:40:08 +00006453 DeclContext *Ctx = computeDeclContext(SS);
6454 if (!Ctx) {
6455 // If the nested-name-specifier is dependent and couldn't be
6456 // resolved to a type, build a typename type.
Douglas Gregore29425b2011-02-28 22:42:13 +00006457 assert(QualifierLoc.getNestedNameSpecifier()->isDependent());
6458 return Context.getDependentNameType(Keyword,
6459 QualifierLoc.getNestedNameSpecifier(),
6460 &II);
Douglas Gregor42af25f2009-05-11 19:58:34 +00006461 }
Douglas Gregord57959a2009-03-27 23:10:48 +00006462
John McCall77bb1aa2010-05-01 00:40:08 +00006463 // If the nested-name-specifier refers to the current instantiation,
6464 // the "typename" keyword itself is superfluous. In C++03, the
6465 // program is actually ill-formed. However, DR 382 (in C++0x CD1)
6466 // allows such extraneous "typename" keywords, and we retroactively
Douglas Gregor732281d2010-06-14 22:07:54 +00006467 // apply this DR to C++03 code with only a warning. In any case we continue.
Douglas Gregor42af25f2009-05-11 19:58:34 +00006468
John McCall77bb1aa2010-05-01 00:40:08 +00006469 if (RequireCompleteDeclContext(SS, Ctx))
6470 return QualType();
Douglas Gregord57959a2009-03-27 23:10:48 +00006471
6472 DeclarationName Name(&II);
Abramo Bagnarae4da7a02010-05-19 21:37:53 +00006473 LookupResult Result(*this, Name, IILoc, LookupOrdinaryName);
John McCalla24dc2e2009-11-17 02:14:36 +00006474 LookupQualifiedName(Result, Ctx);
Douglas Gregord57959a2009-03-27 23:10:48 +00006475 unsigned DiagID = 0;
6476 Decl *Referenced = 0;
John McCalla24dc2e2009-11-17 02:14:36 +00006477 switch (Result.getResultKind()) {
Douglas Gregord57959a2009-03-27 23:10:48 +00006478 case LookupResult::NotFound:
Douglas Gregor3f093272009-10-13 21:16:44 +00006479 DiagID = diag::err_typename_nested_not_found;
Douglas Gregord57959a2009-03-27 23:10:48 +00006480 break;
Douglas Gregord9545042010-12-09 00:06:27 +00006481
6482 case LookupResult::FoundUnresolvedValue: {
6483 // We found a using declaration that is a value. Most likely, the using
6484 // declaration itself is meant to have the 'typename' keyword.
Douglas Gregore29425b2011-02-28 22:42:13 +00006485 SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(),
Douglas Gregord9545042010-12-09 00:06:27 +00006486 IILoc);
6487 Diag(IILoc, diag::err_typename_refers_to_using_value_decl)
6488 << Name << Ctx << FullRange;
6489 if (UnresolvedUsingValueDecl *Using
6490 = dyn_cast<UnresolvedUsingValueDecl>(Result.getRepresentativeDecl())){
Douglas Gregordc355712011-02-25 00:36:19 +00006491 SourceLocation Loc = Using->getQualifierLoc().getBeginLoc();
Douglas Gregord9545042010-12-09 00:06:27 +00006492 Diag(Loc, diag::note_using_value_decl_missing_typename)
6493 << FixItHint::CreateInsertion(Loc, "typename ");
6494 }
6495 }
6496 // Fall through to create a dependent typename type, from which we can recover
6497 // better.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006498
Douglas Gregor7d3f5762010-01-15 01:44:47 +00006499 case LookupResult::NotFoundInCurrentInstantiation:
6500 // Okay, it's a member of an unknown instantiation.
Douglas Gregore29425b2011-02-28 22:42:13 +00006501 return Context.getDependentNameType(Keyword,
6502 QualifierLoc.getNestedNameSpecifier(),
6503 &II);
Douglas Gregord57959a2009-03-27 23:10:48 +00006504
6505 case LookupResult::Found:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006506 if (TypeDecl *Type = dyn_cast<TypeDecl>(Result.getFoundDecl())) {
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006507 // We found a type. Build an ElaboratedType, since the
6508 // typename-specifier was just sugar.
Douglas Gregore29425b2011-02-28 22:42:13 +00006509 return Context.getElaboratedType(ETK_Typename,
6510 QualifierLoc.getNestedNameSpecifier(),
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006511 Context.getTypeDeclType(Type));
Douglas Gregord57959a2009-03-27 23:10:48 +00006512 }
6513
6514 DiagID = diag::err_typename_nested_not_type;
John McCallf36e02d2009-10-09 21:13:30 +00006515 Referenced = Result.getFoundDecl();
Douglas Gregord57959a2009-03-27 23:10:48 +00006516 break;
6517
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006518
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +00006519 llvm_unreachable("unresolved using decl in non-dependent context");
John McCall7ba107a2009-11-18 02:36:19 +00006520 return QualType();
6521
Douglas Gregord57959a2009-03-27 23:10:48 +00006522 case LookupResult::FoundOverloaded:
6523 DiagID = diag::err_typename_nested_not_type;
6524 Referenced = *Result.begin();
6525 break;
6526
John McCall6e247262009-10-10 05:48:19 +00006527 case LookupResult::Ambiguous:
Douglas Gregord57959a2009-03-27 23:10:48 +00006528 return QualType();
6529 }
6530
6531 // If we get here, it's because name lookup did not find a
6532 // type. Emit an appropriate diagnostic and return an error.
Douglas Gregore29425b2011-02-28 22:42:13 +00006533 SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(),
Abramo Bagnarae4da7a02010-05-19 21:37:53 +00006534 IILoc);
6535 Diag(IILoc, DiagID) << FullRange << Name << Ctx;
Douglas Gregord57959a2009-03-27 23:10:48 +00006536 if (Referenced)
6537 Diag(Referenced->getLocation(), diag::note_typename_refers_here)
6538 << Name;
6539 return QualType();
6540}
Douglas Gregor4a959d82009-08-06 16:20:37 +00006541
6542namespace {
6543 // See Sema::RebuildTypeInCurrentInstantiation
Benjamin Kramer85b45212009-11-28 19:45:26 +00006544 class CurrentInstantiationRebuilder
Mike Stump1eb44332009-09-09 15:08:12 +00006545 : public TreeTransform<CurrentInstantiationRebuilder> {
Douglas Gregor4a959d82009-08-06 16:20:37 +00006546 SourceLocation Loc;
6547 DeclarationName Entity;
Mike Stump1eb44332009-09-09 15:08:12 +00006548
Douglas Gregor4a959d82009-08-06 16:20:37 +00006549 public:
Douglas Gregor895162d2010-04-30 18:55:50 +00006550 typedef TreeTransform<CurrentInstantiationRebuilder> inherited;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006551
Mike Stump1eb44332009-09-09 15:08:12 +00006552 CurrentInstantiationRebuilder(Sema &SemaRef,
Douglas Gregor4a959d82009-08-06 16:20:37 +00006553 SourceLocation Loc,
Mike Stump1eb44332009-09-09 15:08:12 +00006554 DeclarationName Entity)
6555 : TreeTransform<CurrentInstantiationRebuilder>(SemaRef),
Douglas Gregor4a959d82009-08-06 16:20:37 +00006556 Loc(Loc), Entity(Entity) { }
Mike Stump1eb44332009-09-09 15:08:12 +00006557
6558 /// \brief Determine whether the given type \p T has already been
Douglas Gregor4a959d82009-08-06 16:20:37 +00006559 /// transformed.
6560 ///
6561 /// For the purposes of type reconstruction, a type has already been
6562 /// transformed if it is NULL or if it is not dependent.
6563 bool AlreadyTransformed(QualType T) {
6564 return T.isNull() || !T->isDependentType();
6565 }
Mike Stump1eb44332009-09-09 15:08:12 +00006566
6567 /// \brief Returns the location of the entity whose type is being
Douglas Gregor4a959d82009-08-06 16:20:37 +00006568 /// rebuilt.
6569 SourceLocation getBaseLocation() { return Loc; }
Mike Stump1eb44332009-09-09 15:08:12 +00006570
Douglas Gregor4a959d82009-08-06 16:20:37 +00006571 /// \brief Returns the name of the entity whose type is being rebuilt.
6572 DeclarationName getBaseEntity() { return Entity; }
Mike Stump1eb44332009-09-09 15:08:12 +00006573
Douglas Gregor972e6ce2009-10-27 06:26:26 +00006574 /// \brief Sets the "base" location and entity when that
6575 /// information is known based on another transformation.
6576 void setBase(SourceLocation Loc, DeclarationName Entity) {
6577 this->Loc = Loc;
6578 this->Entity = Entity;
6579 }
Douglas Gregor4a959d82009-08-06 16:20:37 +00006580 };
6581}
6582
Douglas Gregor4a959d82009-08-06 16:20:37 +00006583/// \brief Rebuilds a type within the context of the current instantiation.
6584///
Mike Stump1eb44332009-09-09 15:08:12 +00006585/// The type \p T is part of the type of an out-of-line member definition of
Douglas Gregor4a959d82009-08-06 16:20:37 +00006586/// a class template (or class template partial specialization) that was parsed
Mike Stump1eb44332009-09-09 15:08:12 +00006587/// and constructed before we entered the scope of the class template (or
Douglas Gregor4a959d82009-08-06 16:20:37 +00006588/// partial specialization thereof). This routine will rebuild that type now
6589/// that we have entered the declarator's scope, which may produce different
6590/// canonical types, e.g.,
6591///
6592/// \code
6593/// template<typename T>
6594/// struct X {
6595/// typedef T* pointer;
6596/// pointer data();
6597/// };
6598///
6599/// template<typename T>
6600/// typename X<T>::pointer X<T>::data() { ... }
6601/// \endcode
6602///
Douglas Gregor4714c122010-03-31 17:34:00 +00006603/// Here, the type "typename X<T>::pointer" will be created as a DependentNameType,
Douglas Gregor4a959d82009-08-06 16:20:37 +00006604/// since we do not know that we can look into X<T> when we parsed the type.
6605/// This function will rebuild the type, performing the lookup of "pointer"
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006606/// in X<T> and returning an ElaboratedType whose canonical type is the same
Douglas Gregor4a959d82009-08-06 16:20:37 +00006607/// as the canonical type of T*, allowing the return types of the out-of-line
6608/// definition and the declaration to match.
John McCall63b43852010-04-29 23:50:39 +00006609TypeSourceInfo *Sema::RebuildTypeInCurrentInstantiation(TypeSourceInfo *T,
6610 SourceLocation Loc,
6611 DeclarationName Name) {
6612 if (!T || !T->getType()->isDependentType())
Douglas Gregor4a959d82009-08-06 16:20:37 +00006613 return T;
Mike Stump1eb44332009-09-09 15:08:12 +00006614
Douglas Gregor4a959d82009-08-06 16:20:37 +00006615 CurrentInstantiationRebuilder Rebuilder(*this, Loc, Name);
6616 return Rebuilder.TransformType(T);
Benjamin Kramer27ba2f02009-08-11 22:33:06 +00006617}
Douglas Gregorbf4ea562009-09-15 16:23:51 +00006618
John McCall60d7b3a2010-08-24 06:29:42 +00006619ExprResult Sema::RebuildExprInCurrentInstantiation(Expr *E) {
John McCallb3d87482010-08-24 05:47:05 +00006620 CurrentInstantiationRebuilder Rebuilder(*this, E->getExprLoc(),
6621 DeclarationName());
6622 return Rebuilder.TransformExpr(E);
6623}
6624
John McCall63b43852010-04-29 23:50:39 +00006625bool Sema::RebuildNestedNameSpecifierInCurrentInstantiation(CXXScopeSpec &SS) {
Douglas Gregor7e384942011-02-25 16:07:42 +00006626 if (SS.isInvalid())
6627 return true;
John McCall31f17ec2010-04-27 00:57:59 +00006628
Douglas Gregor7e384942011-02-25 16:07:42 +00006629 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
John McCall31f17ec2010-04-27 00:57:59 +00006630 CurrentInstantiationRebuilder Rebuilder(*this, SS.getRange().getBegin(),
6631 DeclarationName());
Douglas Gregor7e384942011-02-25 16:07:42 +00006632 NestedNameSpecifierLoc Rebuilt
6633 = Rebuilder.TransformNestedNameSpecifierLoc(QualifierLoc);
6634 if (!Rebuilt)
6635 return true;
John McCall63b43852010-04-29 23:50:39 +00006636
Douglas Gregor7e384942011-02-25 16:07:42 +00006637 SS.Adopt(Rebuilt);
John McCall63b43852010-04-29 23:50:39 +00006638 return false;
John McCall31f17ec2010-04-27 00:57:59 +00006639}
6640
Douglas Gregorbf4ea562009-09-15 16:23:51 +00006641/// \brief Produces a formatted string that describes the binding of
6642/// template parameters to template arguments.
6643std::string
6644Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params,
6645 const TemplateArgumentList &Args) {
Douglas Gregor910f8002010-11-07 23:05:16 +00006646 return getTemplateArgumentBindingsText(Params, Args.data(), Args.size());
Douglas Gregor9148c3f2009-11-11 19:13:48 +00006647}
6648
6649std::string
6650Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params,
6651 const TemplateArgument *Args,
6652 unsigned NumArgs) {
Douglas Gregor87dd6972010-12-20 16:52:59 +00006653 llvm::SmallString<128> Str;
6654 llvm::raw_svector_ostream Out(Str);
Douglas Gregorbf4ea562009-09-15 16:23:51 +00006655
Douglas Gregor9148c3f2009-11-11 19:13:48 +00006656 if (!Params || Params->size() == 0 || NumArgs == 0)
Douglas Gregor87dd6972010-12-20 16:52:59 +00006657 return std::string();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006658
Douglas Gregorbf4ea562009-09-15 16:23:51 +00006659 for (unsigned I = 0, N = Params->size(); I != N; ++I) {
Douglas Gregor9148c3f2009-11-11 19:13:48 +00006660 if (I >= NumArgs)
6661 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006662
Douglas Gregorbf4ea562009-09-15 16:23:51 +00006663 if (I == 0)
Douglas Gregor87dd6972010-12-20 16:52:59 +00006664 Out << "[with ";
Douglas Gregorbf4ea562009-09-15 16:23:51 +00006665 else
Douglas Gregor87dd6972010-12-20 16:52:59 +00006666 Out << ", ";
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006667
Douglas Gregorbf4ea562009-09-15 16:23:51 +00006668 if (const IdentifierInfo *Id = Params->getParam(I)->getIdentifier()) {
Douglas Gregor87dd6972010-12-20 16:52:59 +00006669 Out << Id->getName();
Douglas Gregorbf4ea562009-09-15 16:23:51 +00006670 } else {
Douglas Gregor87dd6972010-12-20 16:52:59 +00006671 Out << '$' << I;
Douglas Gregorbf4ea562009-09-15 16:23:51 +00006672 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006673
Douglas Gregor87dd6972010-12-20 16:52:59 +00006674 Out << " = ";
6675 Args[I].print(Context.PrintingPolicy, Out);
Douglas Gregorbf4ea562009-09-15 16:23:51 +00006676 }
Douglas Gregor87dd6972010-12-20 16:52:59 +00006677
6678 Out << ']';
6679 return Out.str();
Douglas Gregorbf4ea562009-09-15 16:23:51 +00006680}
Francois Pichet8387e2a2011-04-22 22:18:13 +00006681
6682void Sema::MarkAsLateParsedTemplate(FunctionDecl *FD, bool Flag) {
6683 if (!FD)
6684 return;
6685 FD->setLateTemplateParsed(Flag);
6686}
6687
6688bool Sema::IsInsideALocalClassWithinATemplateFunction() {
6689 DeclContext *DC = CurContext;
6690
6691 while (DC) {
6692 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) {
6693 const FunctionDecl *FD = RD->isLocalClass();
6694 return (FD && FD->getTemplatedKind() != FunctionDecl::TK_NonTemplate);
6695 } else if (DC->isTranslationUnit() || DC->isNamespace())
6696 return false;
6697
6698 DC = DC->getParent();
6699 }
6700 return false;
6701}