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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
Douglas Gregor4a959d82009-08-06 16:20:37 +000012#include "TreeTransform.h"
Douglas Gregorddc29e12009-02-06 22:42:48 +000013#include "clang/AST/ASTContext.h"
Larisse Voufoef4579c2013-08-06 01:03:05 +000014#include "clang/AST/ASTConsumer.h"
John McCall92b7f702010-03-11 07:50:04 +000015#include "clang/AST/DeclFriend.h"
Douglas Gregoraaba5e32009-02-04 19:02:06 +000016#include "clang/AST/DeclTemplate.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000017#include "clang/AST/Expr.h"
18#include "clang/AST/ExprCXX.h"
John McCall4e2cbb22010-10-20 05:44:58 +000019#include "clang/AST/RecursiveASTVisitor.h"
Douglas Gregor5f3aeb62010-10-13 00:27:52 +000020#include "clang/AST/TypeVisitor.h"
Douglas Gregor72c3f312008-12-05 18:15:24 +000021#include "clang/Basic/LangOptions.h"
Douglas Gregord5a423b2009-09-25 18:43:00 +000022#include "clang/Basic/PartialDiagnostic.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000023#include "clang/Sema/DeclSpec.h"
24#include "clang/Sema/Lookup.h"
25#include "clang/Sema/ParsedTemplate.h"
26#include "clang/Sema/Scope.h"
27#include "clang/Sema/SemaInternal.h"
28#include "clang/Sema/Template.h"
29#include "clang/Sema/TemplateDeduction.h"
Benjamin Kramer013b3662012-01-30 16:17:39 +000030#include "llvm/ADT/SmallBitVector.h"
Benjamin Kramer8fe83e12012-02-04 13:45:25 +000031#include "llvm/ADT/SmallString.h"
Douglas Gregorbf4ea562009-09-15 16:23:51 +000032#include "llvm/ADT/StringExtras.h"
Douglas Gregor72c3f312008-12-05 18:15:24 +000033using namespace clang;
John McCall2a7fb272010-08-25 05:32:35 +000034using namespace sema;
Douglas Gregor72c3f312008-12-05 18:15:24 +000035
John McCall78b81052010-11-10 02:40:36 +000036// Exported for use by Parser.
37SourceRange
38clang::getTemplateParamsRange(TemplateParameterList const * const *Ps,
39 unsigned N) {
40 if (!N) return SourceRange();
41 return SourceRange(Ps[0]->getTemplateLoc(), Ps[N-1]->getRAngleLoc());
42}
43
Douglas Gregor2dd078a2009-09-02 22:59:36 +000044/// \brief Determine whether the declaration found is acceptable as the name
45/// of a template and, if so, return that template declaration. Otherwise,
46/// returns NULL.
John McCallad00b772010-06-16 08:42:20 +000047static NamedDecl *isAcceptableTemplateName(ASTContext &Context,
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +000048 NamedDecl *Orig,
49 bool AllowFunctionTemplates) {
John McCallad00b772010-06-16 08:42:20 +000050 NamedDecl *D = Orig->getUnderlyingDecl();
Mike Stump1eb44332009-09-09 15:08:12 +000051
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +000052 if (isa<TemplateDecl>(D)) {
53 if (!AllowFunctionTemplates && isa<FunctionTemplateDecl>(D))
54 return 0;
55
John McCallad00b772010-06-16 08:42:20 +000056 return Orig;
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +000057 }
Mike Stump1eb44332009-09-09 15:08:12 +000058
Douglas Gregor2dd078a2009-09-02 22:59:36 +000059 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
60 // C++ [temp.local]p1:
61 // Like normal (non-template) classes, class templates have an
62 // injected-class-name (Clause 9). The injected-class-name
63 // can be used with or without a template-argument-list. When
64 // it is used without a template-argument-list, it is
65 // equivalent to the injected-class-name followed by the
66 // template-parameters of the class template enclosed in
67 // <>. When it is used with a template-argument-list, it
68 // refers to the specified class template specialization,
69 // which could be the current specialization or another
70 // specialization.
71 if (Record->isInjectedClassName()) {
Douglas Gregor542b5482009-10-14 17:30:58 +000072 Record = cast<CXXRecordDecl>(Record->getDeclContext());
Douglas Gregor2dd078a2009-09-02 22:59:36 +000073 if (Record->getDescribedClassTemplate())
74 return Record->getDescribedClassTemplate();
75
76 if (ClassTemplateSpecializationDecl *Spec
77 = dyn_cast<ClassTemplateSpecializationDecl>(Record))
78 return Spec->getSpecializedTemplate();
79 }
Mike Stump1eb44332009-09-09 15:08:12 +000080
Douglas Gregor2dd078a2009-09-02 22:59:36 +000081 return 0;
82 }
Mike Stump1eb44332009-09-09 15:08:12 +000083
Douglas Gregor2dd078a2009-09-02 22:59:36 +000084 return 0;
85}
86
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +000087void Sema::FilterAcceptableTemplateNames(LookupResult &R,
88 bool AllowFunctionTemplates) {
Douglas Gregor01e56ae2010-04-12 20:54:26 +000089 // The set of class templates we've already seen.
90 llvm::SmallPtrSet<ClassTemplateDecl *, 8> ClassTemplates;
John McCallf7a1a742009-11-24 19:00:30 +000091 LookupResult::Filter filter = R.makeFilter();
92 while (filter.hasNext()) {
93 NamedDecl *Orig = filter.next();
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +000094 NamedDecl *Repl = isAcceptableTemplateName(Context, Orig,
95 AllowFunctionTemplates);
John McCallf7a1a742009-11-24 19:00:30 +000096 if (!Repl)
97 filter.erase();
Douglas Gregor01e56ae2010-04-12 20:54:26 +000098 else if (Repl != Orig) {
99
100 // C++ [temp.local]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000101 // A lookup that finds an injected-class-name (10.2) can result in an
Douglas Gregor01e56ae2010-04-12 20:54:26 +0000102 // ambiguity in certain cases (for example, if it is found in more than
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000103 // one base class). If all of the injected-class-names that are found
104 // refer to specializations of the same class template, and if the name
Richard Smith3e4c6c42011-05-05 21:57:07 +0000105 // is used as a template-name, the reference refers to the class
106 // template itself and not a specialization thereof, and is not
Douglas Gregor01e56ae2010-04-12 20:54:26 +0000107 // ambiguous.
Douglas Gregor01e56ae2010-04-12 20:54:26 +0000108 if (ClassTemplateDecl *ClassTmpl = dyn_cast<ClassTemplateDecl>(Repl))
109 if (!ClassTemplates.insert(ClassTmpl)) {
110 filter.erase();
111 continue;
112 }
John McCall8ba66912010-08-13 07:02:08 +0000113
114 // FIXME: we promote access to public here as a workaround to
115 // the fact that LookupResult doesn't let us remember that we
116 // found this template through a particular injected class name,
117 // which means we end up doing nasty things to the invariants.
118 // Pretending that access is public is *much* safer.
119 filter.replace(Repl, AS_public);
Douglas Gregor01e56ae2010-04-12 20:54:26 +0000120 }
John McCallf7a1a742009-11-24 19:00:30 +0000121 }
122 filter.done();
123}
124
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000125bool Sema::hasAnyAcceptableTemplateNames(LookupResult &R,
126 bool AllowFunctionTemplates) {
Douglas Gregor312eadb2011-04-24 05:37:28 +0000127 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I)
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000128 if (isAcceptableTemplateName(Context, *I, AllowFunctionTemplates))
Douglas Gregor312eadb2011-04-24 05:37:28 +0000129 return true;
130
Douglas Gregor3b887352011-04-27 04:48:22 +0000131 return false;
Douglas Gregor312eadb2011-04-24 05:37:28 +0000132}
133
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000134TemplateNameKind Sema::isTemplateName(Scope *S,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +0000135 CXXScopeSpec &SS,
Abramo Bagnara7c153532010-08-06 12:11:11 +0000136 bool hasTemplateKeyword,
Douglas Gregor014e88d2009-11-03 23:16:33 +0000137 UnqualifiedId &Name,
John McCallb3d87482010-08-24 05:47:05 +0000138 ParsedType ObjectTypePtr,
Douglas Gregor495c35d2009-08-25 22:51:20 +0000139 bool EnteringContext,
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000140 TemplateTy &TemplateResult,
141 bool &MemberOfUnknownSpecialization) {
David Blaikie4e4d0842012-03-11 07:00:24 +0000142 assert(getLangOpts().CPlusPlus && "No template names in C!");
Douglas Gregorb862b8f2010-01-11 23:29:10 +0000143
Douglas Gregor014e88d2009-11-03 23:16:33 +0000144 DeclarationName TName;
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000145 MemberOfUnknownSpecialization = false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000146
Douglas Gregor014e88d2009-11-03 23:16:33 +0000147 switch (Name.getKind()) {
148 case UnqualifiedId::IK_Identifier:
149 TName = DeclarationName(Name.Identifier);
150 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000151
Douglas Gregor014e88d2009-11-03 23:16:33 +0000152 case UnqualifiedId::IK_OperatorFunctionId:
153 TName = Context.DeclarationNames.getCXXOperatorName(
154 Name.OperatorFunctionId.Operator);
155 break;
156
Sean Hunte6252d12009-11-28 08:58:14 +0000157 case UnqualifiedId::IK_LiteralOperatorId:
Sean Hunt3e518bd2009-11-29 07:34:05 +0000158 TName = Context.DeclarationNames.getCXXLiteralOperatorName(Name.Identifier);
159 break;
Sean Hunte6252d12009-11-28 08:58:14 +0000160
Douglas Gregor014e88d2009-11-03 23:16:33 +0000161 default:
162 return TNK_Non_template;
163 }
Mike Stump1eb44332009-09-09 15:08:12 +0000164
John McCallb3d87482010-08-24 05:47:05 +0000165 QualType ObjectType = ObjectTypePtr.get();
Mike Stump1eb44332009-09-09 15:08:12 +0000166
Daniel Dunbar96a00142012-03-09 18:35:03 +0000167 LookupResult R(*this, TName, Name.getLocStart(), LookupOrdinaryName);
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000168 LookupTemplateName(R, S, SS, ObjectType, EnteringContext,
169 MemberOfUnknownSpecialization);
John McCall67d22fb2010-08-28 20:17:00 +0000170 if (R.empty()) return TNK_Non_template;
171 if (R.isAmbiguous()) {
172 // Suppress diagnostics; we'll redo this lookup later.
John McCallb8592062010-08-13 02:23:42 +0000173 R.suppressDiagnostics();
John McCall67d22fb2010-08-28 20:17:00 +0000174
175 // FIXME: we might have ambiguous templates, in which case we
176 // should at least parse them properly!
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000177 return TNK_Non_template;
John McCallb8592062010-08-13 02:23:42 +0000178 }
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000179
John McCall0bd6feb2009-12-02 08:04:21 +0000180 TemplateName Template;
181 TemplateNameKind TemplateKind;
Mike Stump1eb44332009-09-09 15:08:12 +0000182
John McCall0bd6feb2009-12-02 08:04:21 +0000183 unsigned ResultCount = R.end() - R.begin();
184 if (ResultCount > 1) {
185 // We assume that we'll preserve the qualifier from a function
186 // template name in other ways.
187 Template = Context.getOverloadedTemplateName(R.begin(), R.end());
188 TemplateKind = TNK_Function_template;
John McCallb8592062010-08-13 02:23:42 +0000189
190 // We'll do this lookup again later.
191 R.suppressDiagnostics();
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000192 } else {
John McCall0bd6feb2009-12-02 08:04:21 +0000193 TemplateDecl *TD = cast<TemplateDecl>((*R.begin())->getUnderlyingDecl());
194
195 if (SS.isSet() && !SS.isInvalid()) {
196 NestedNameSpecifier *Qualifier
197 = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
Abramo Bagnara7c153532010-08-06 12:11:11 +0000198 Template = Context.getQualifiedTemplateName(Qualifier,
199 hasTemplateKeyword, TD);
John McCall0bd6feb2009-12-02 08:04:21 +0000200 } else {
201 Template = TemplateName(TD);
202 }
203
John McCallb8592062010-08-13 02:23:42 +0000204 if (isa<FunctionTemplateDecl>(TD)) {
John McCall0bd6feb2009-12-02 08:04:21 +0000205 TemplateKind = TNK_Function_template;
John McCallb8592062010-08-13 02:23:42 +0000206
207 // We'll do this lookup again later.
208 R.suppressDiagnostics();
209 } else {
Richard Smith3e4c6c42011-05-05 21:57:07 +0000210 assert(isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) ||
Larisse Voufoef4579c2013-08-06 01:03:05 +0000211 isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD));
212 TemplateKind =
213 isa<VarTemplateDecl>(TD) ? TNK_Var_template : TNK_Type_template;
John McCall0bd6feb2009-12-02 08:04:21 +0000214 }
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000215 }
Mike Stump1eb44332009-09-09 15:08:12 +0000216
John McCall0bd6feb2009-12-02 08:04:21 +0000217 TemplateResult = TemplateTy::make(Template);
218 return TemplateKind;
John McCallf7a1a742009-11-24 19:00:30 +0000219}
220
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000221bool Sema::DiagnoseUnknownTemplateName(const IdentifierInfo &II,
Douglas Gregor84d0a192010-01-12 21:28:44 +0000222 SourceLocation IILoc,
223 Scope *S,
224 const CXXScopeSpec *SS,
225 TemplateTy &SuggestedTemplate,
226 TemplateNameKind &SuggestedKind) {
227 // We can't recover unless there's a dependent scope specifier preceding the
228 // template name.
Douglas Gregord5ab9b02010-05-21 23:43:39 +0000229 // FIXME: Typo correction?
Douglas Gregor84d0a192010-01-12 21:28:44 +0000230 if (!SS || !SS->isSet() || !isDependentScopeSpecifier(*SS) ||
231 computeDeclContext(*SS))
232 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000233
Douglas Gregor84d0a192010-01-12 21:28:44 +0000234 // The code is missing a 'template' keyword prior to the dependent template
235 // name.
236 NestedNameSpecifier *Qualifier = (NestedNameSpecifier*)SS->getScopeRep();
237 Diag(IILoc, diag::err_template_kw_missing)
238 << Qualifier << II.getName()
Douglas Gregor849b2432010-03-31 17:46:05 +0000239 << FixItHint::CreateInsertion(IILoc, "template ");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000240 SuggestedTemplate
Douglas Gregor84d0a192010-01-12 21:28:44 +0000241 = TemplateTy::make(Context.getDependentTemplateName(Qualifier, &II));
242 SuggestedKind = TNK_Dependent_template_name;
243 return true;
244}
245
John McCallf7a1a742009-11-24 19:00:30 +0000246void Sema::LookupTemplateName(LookupResult &Found,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +0000247 Scope *S, CXXScopeSpec &SS,
John McCallf7a1a742009-11-24 19:00:30 +0000248 QualType ObjectType,
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000249 bool EnteringContext,
250 bool &MemberOfUnknownSpecialization) {
John McCallf7a1a742009-11-24 19:00:30 +0000251 // Determine where to perform name lookup
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000252 MemberOfUnknownSpecialization = false;
John McCallf7a1a742009-11-24 19:00:30 +0000253 DeclContext *LookupCtx = 0;
254 bool isDependent = false;
255 if (!ObjectType.isNull()) {
256 // This nested-name-specifier occurs in a member access expression, e.g.,
257 // x->B::f, and we are looking into the type of the object.
258 assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist");
259 LookupCtx = computeDeclContext(ObjectType);
260 isDependent = ObjectType->isDependentType();
Richard Smith33f0faa2013-06-07 20:03:01 +0000261 assert((isDependent || !ObjectType->isIncompleteType() ||
262 ObjectType->castAs<TagType>()->isBeingDefined()) &&
John McCallf7a1a742009-11-24 19:00:30 +0000263 "Caller should have completed object type");
Douglas Gregor1d7049a2012-01-12 16:11:24 +0000264
265 // Template names cannot appear inside an Objective-C class or object type.
266 if (ObjectType->isObjCObjectOrInterfaceType()) {
267 Found.clear();
268 return;
269 }
John McCallf7a1a742009-11-24 19:00:30 +0000270 } else if (SS.isSet()) {
271 // This nested-name-specifier occurs after another nested-name-specifier,
272 // so long into the context associated with the prior nested-name-specifier.
273 LookupCtx = computeDeclContext(SS, EnteringContext);
274 isDependent = isDependentScopeSpecifier(SS);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000275
John McCallf7a1a742009-11-24 19:00:30 +0000276 // The declaration context must be complete.
John McCall77bb1aa2010-05-01 00:40:08 +0000277 if (LookupCtx && RequireCompleteDeclContext(SS, LookupCtx))
John McCallf7a1a742009-11-24 19:00:30 +0000278 return;
279 }
280
281 bool ObjectTypeSearchedInScope = false;
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000282 bool AllowFunctionTemplatesInLookup = true;
John McCallf7a1a742009-11-24 19:00:30 +0000283 if (LookupCtx) {
284 // Perform "qualified" name lookup into the declaration context we
285 // computed, which is either the type of the base of a member access
286 // expression or the declaration context associated with a prior
287 // nested-name-specifier.
288 LookupQualifiedName(Found, LookupCtx);
John McCallf7a1a742009-11-24 19:00:30 +0000289 if (!ObjectType.isNull() && Found.empty()) {
290 // C++ [basic.lookup.classref]p1:
291 // In a class member access expression (5.2.5), if the . or -> token is
292 // immediately followed by an identifier followed by a <, the
293 // identifier must be looked up to determine whether the < is the
294 // beginning of a template argument list (14.2) or a less-than operator.
295 // The identifier is first looked up in the class of the object
296 // expression. If the identifier is not found, it is then looked up in
297 // the context of the entire postfix-expression and shall name a class
298 // or function template.
John McCallf7a1a742009-11-24 19:00:30 +0000299 if (S) LookupName(Found, S);
300 ObjectTypeSearchedInScope = true;
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000301 AllowFunctionTemplatesInLookup = false;
John McCallf7a1a742009-11-24 19:00:30 +0000302 }
Douglas Gregorf9f97a02010-07-16 16:54:17 +0000303 } else if (isDependent && (!S || ObjectType.isNull())) {
Douglas Gregor2e933882010-01-12 17:06:20 +0000304 // We cannot look into a dependent object type or nested nme
305 // specifier.
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000306 MemberOfUnknownSpecialization = true;
John McCallf7a1a742009-11-24 19:00:30 +0000307 return;
308 } else {
309 // Perform unqualified name lookup in the current scope.
310 LookupName(Found, S);
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000311
312 if (!ObjectType.isNull())
313 AllowFunctionTemplatesInLookup = false;
John McCallf7a1a742009-11-24 19:00:30 +0000314 }
315
Douglas Gregor2e933882010-01-12 17:06:20 +0000316 if (Found.empty() && !isDependent) {
Douglas Gregorbfea2392009-12-31 08:11:17 +0000317 // If we did not find any names, attempt to correct any typos.
318 DeclarationName Name = Found.getLookupName();
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000319 Found.clear();
Kaelyn Uhrainf8ec8c92012-01-13 23:10:36 +0000320 // Simple filter callback that, for keywords, only accepts the C++ *_cast
321 CorrectionCandidateCallback FilterCCC;
322 FilterCCC.WantTypeSpecifiers = false;
323 FilterCCC.WantExpressionKeywords = false;
324 FilterCCC.WantRemainingKeywords = false;
325 FilterCCC.WantCXXNamedCasts = true;
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000326 if (TypoCorrection Corrected = CorrectTypo(Found.getLookupNameInfo(),
327 Found.getLookupKind(), S, &SS,
Kaelyn Uhrain16e46dd2012-01-31 23:49:25 +0000328 FilterCCC, LookupCtx)) {
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000329 Found.setLookupName(Corrected.getCorrection());
330 if (Corrected.getCorrectionDecl())
331 Found.addDecl(Corrected.getCorrectionDecl());
Douglas Gregor312eadb2011-04-24 05:37:28 +0000332 FilterAcceptableTemplateNames(Found);
John McCallad00b772010-06-16 08:42:20 +0000333 if (!Found.empty()) {
Kaelyn Uhrainb2567dd2013-07-02 23:47:44 +0000334 if (LookupCtx) {
Richard Smith2d670972013-08-17 00:46:16 +0000335 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
336 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
Kaelyn Uhrainb2567dd2013-07-02 23:47:44 +0000337 Name.getAsString() == CorrectedStr;
Richard Smith2d670972013-08-17 00:46:16 +0000338 diagnoseTypo(Corrected, PDiag(diag::err_no_member_template_suggest)
339 << Name << LookupCtx << DroppedSpecifier
340 << SS.getRange());
Kaelyn Uhrainb2567dd2013-07-02 23:47:44 +0000341 } else {
Richard Smith2d670972013-08-17 00:46:16 +0000342 diagnoseTypo(Corrected, PDiag(diag::err_no_template_suggest) << Name);
Kaelyn Uhrainb2567dd2013-07-02 23:47:44 +0000343 }
John McCallad00b772010-06-16 08:42:20 +0000344 }
Douglas Gregorbfea2392009-12-31 08:11:17 +0000345 } else {
Douglas Gregor12eb5d62010-06-29 19:27:42 +0000346 Found.setLookupName(Name);
Douglas Gregorbfea2392009-12-31 08:11:17 +0000347 }
348 }
349
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000350 FilterAcceptableTemplateNames(Found, AllowFunctionTemplatesInLookup);
Douglas Gregorf9f97a02010-07-16 16:54:17 +0000351 if (Found.empty()) {
352 if (isDependent)
353 MemberOfUnknownSpecialization = true;
John McCallf7a1a742009-11-24 19:00:30 +0000354 return;
Douglas Gregorf9f97a02010-07-16 16:54:17 +0000355 }
John McCallf7a1a742009-11-24 19:00:30 +0000356
Douglas Gregor05e60762012-05-01 20:23:02 +0000357 if (S && !ObjectType.isNull() && !ObjectTypeSearchedInScope &&
Richard Smithefd570e2013-09-03 21:22:41 +0000358 !getLangOpts().CPlusPlus11) {
Douglas Gregor05e60762012-05-01 20:23:02 +0000359 // C++03 [basic.lookup.classref]p1:
John McCallf7a1a742009-11-24 19:00:30 +0000360 // [...] If the lookup in the class of the object expression finds a
361 // template, the name is also looked up in the context of the entire
362 // postfix-expression and [...]
363 //
Douglas Gregor05e60762012-05-01 20:23:02 +0000364 // Note: C++11 does not perform this second lookup.
John McCallf7a1a742009-11-24 19:00:30 +0000365 LookupResult FoundOuter(*this, Found.getLookupName(), Found.getNameLoc(),
366 LookupOrdinaryName);
367 LookupName(FoundOuter, S);
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000368 FilterAcceptableTemplateNames(FoundOuter, /*AllowFunctionTemplates=*/false);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000369
John McCallf7a1a742009-11-24 19:00:30 +0000370 if (FoundOuter.empty()) {
371 // - if the name is not found, the name found in the class of the
372 // object expression is used, otherwise
Douglas Gregora6d1e762011-08-10 21:59:45 +0000373 } else if (!FoundOuter.getAsSingle<ClassTemplateDecl>() ||
374 FoundOuter.isAmbiguous()) {
John McCallf7a1a742009-11-24 19:00:30 +0000375 // - if the name is found in the context of the entire
376 // postfix-expression and does not name a class template, the name
377 // found in the class of the object expression is used, otherwise
Douglas Gregora6d1e762011-08-10 21:59:45 +0000378 FoundOuter.clear();
John McCallad00b772010-06-16 08:42:20 +0000379 } else if (!Found.isSuppressingDiagnostics()) {
John McCallf7a1a742009-11-24 19:00:30 +0000380 // - if the name found is a class template, it must refer to the same
381 // entity as the one found in the class of the object expression,
382 // otherwise the program is ill-formed.
383 if (!Found.isSingleResult() ||
384 Found.getFoundDecl()->getCanonicalDecl()
385 != FoundOuter.getFoundDecl()->getCanonicalDecl()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000386 Diag(Found.getNameLoc(),
Jeffrey Yasskin21d07e42010-06-05 01:39:57 +0000387 diag::ext_nested_name_member_ref_lookup_ambiguous)
388 << Found.getLookupName()
389 << ObjectType;
John McCallf7a1a742009-11-24 19:00:30 +0000390 Diag(Found.getRepresentativeDecl()->getLocation(),
391 diag::note_ambig_member_ref_object_type)
392 << ObjectType;
393 Diag(FoundOuter.getFoundDecl()->getLocation(),
394 diag::note_ambig_member_ref_scope);
395
396 // Recover by taking the template that we found in the object
397 // expression's type.
398 }
399 }
400 }
401}
402
John McCall2f841ba2009-12-02 03:53:29 +0000403/// ActOnDependentIdExpression - Handle a dependent id-expression that
404/// was just parsed. This is only possible with an explicit scope
405/// specifier naming a dependent type.
John McCall60d7b3a2010-08-24 06:29:42 +0000406ExprResult
John McCallf7a1a742009-11-24 19:00:30 +0000407Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS,
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000408 SourceLocation TemplateKWLoc,
Abramo Bagnara25777432010-08-11 22:01:17 +0000409 const DeclarationNameInfo &NameInfo,
John McCall2f841ba2009-12-02 03:53:29 +0000410 bool isAddressOfOperand,
John McCallf7a1a742009-11-24 19:00:30 +0000411 const TemplateArgumentListInfo *TemplateArgs) {
John McCallea1471e2010-05-20 01:18:31 +0000412 DeclContext *DC = getFunctionLevelDeclContext();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000413
John McCall2f841ba2009-12-02 03:53:29 +0000414 if (!isAddressOfOperand &&
John McCallea1471e2010-05-20 01:18:31 +0000415 isa<CXXMethodDecl>(DC) &&
416 cast<CXXMethodDecl>(DC)->isInstance()) {
417 QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType(Context);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000418
John McCallf7a1a742009-11-24 19:00:30 +0000419 // Since the 'this' expression is synthesized, we don't need to
420 // perform the double-lookup check.
421 NamedDecl *FirstQualifierInScope = 0;
422
John McCallaa81e162009-12-01 22:10:20 +0000423 return Owned(CXXDependentScopeMemberExpr::Create(Context,
424 /*This*/ 0, ThisType,
425 /*IsArrow*/ true,
John McCallf7a1a742009-11-24 19:00:30 +0000426 /*Op*/ SourceLocation(),
Douglas Gregor7c3179c2011-02-28 18:50:33 +0000427 SS.getWithLocInContext(Context),
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000428 TemplateKWLoc,
John McCallf7a1a742009-11-24 19:00:30 +0000429 FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +0000430 NameInfo,
John McCallf7a1a742009-11-24 19:00:30 +0000431 TemplateArgs));
432 }
433
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000434 return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs);
John McCallf7a1a742009-11-24 19:00:30 +0000435}
436
John McCall60d7b3a2010-08-24 06:29:42 +0000437ExprResult
John McCallf7a1a742009-11-24 19:00:30 +0000438Sema::BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000439 SourceLocation TemplateKWLoc,
Abramo Bagnara25777432010-08-11 22:01:17 +0000440 const DeclarationNameInfo &NameInfo,
John McCallf7a1a742009-11-24 19:00:30 +0000441 const TemplateArgumentListInfo *TemplateArgs) {
442 return Owned(DependentScopeDeclRefExpr::Create(Context,
Douglas Gregor00cf3cc2011-02-25 20:49:16 +0000443 SS.getWithLocInContext(Context),
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000444 TemplateKWLoc,
Abramo Bagnara25777432010-08-11 22:01:17 +0000445 NameInfo,
John McCallf7a1a742009-11-24 19:00:30 +0000446 TemplateArgs));
Douglas Gregord6fb7ef2008-12-18 19:37:40 +0000447}
448
Douglas Gregor72c3f312008-12-05 18:15:24 +0000449/// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining
450/// that the template parameter 'PrevDecl' is being shadowed by a new
451/// declaration at location Loc. Returns true to indicate that this is
452/// an error, and false otherwise.
Douglas Gregorcb8f9512011-10-20 17:58:49 +0000453void Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl) {
Douglas Gregorf57172b2008-12-08 18:40:42 +0000454 assert(PrevDecl->isTemplateParameter() && "Not a template parameter");
Douglas Gregor72c3f312008-12-05 18:15:24 +0000455
456 // Microsoft Visual C++ permits template parameters to be shadowed.
David Blaikie4e4d0842012-03-11 07:00:24 +0000457 if (getLangOpts().MicrosoftExt)
Douglas Gregorcb8f9512011-10-20 17:58:49 +0000458 return;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000459
460 // C++ [temp.local]p4:
461 // A template-parameter shall not be redeclared within its
462 // scope (including nested scopes).
Mike Stump1eb44332009-09-09 15:08:12 +0000463 Diag(Loc, diag::err_template_param_shadow)
Douglas Gregor72c3f312008-12-05 18:15:24 +0000464 << cast<NamedDecl>(PrevDecl)->getDeclName();
465 Diag(PrevDecl->getLocation(), diag::note_template_param_here);
Douglas Gregorcb8f9512011-10-20 17:58:49 +0000466 return;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000467}
468
Douglas Gregor2943aed2009-03-03 04:44:36 +0000469/// AdjustDeclIfTemplate - If the given decl happens to be a template, reset
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000470/// the parameter D to reference the templated declaration and return a pointer
471/// to the template declaration. Otherwise, do nothing to D and return null.
John McCalld226f652010-08-21 09:40:31 +0000472TemplateDecl *Sema::AdjustDeclIfTemplate(Decl *&D) {
473 if (TemplateDecl *Temp = dyn_cast_or_null<TemplateDecl>(D)) {
474 D = Temp->getTemplatedDecl();
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000475 return Temp;
476 }
477 return 0;
478}
479
Douglas Gregorba68eca2011-01-05 17:40:24 +0000480ParsedTemplateArgument ParsedTemplateArgument::getTemplatePackExpansion(
481 SourceLocation EllipsisLoc) const {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000482 assert(Kind == Template &&
Douglas Gregorba68eca2011-01-05 17:40:24 +0000483 "Only template template arguments can be pack expansions here");
484 assert(getAsTemplate().get().containsUnexpandedParameterPack() &&
485 "Template template argument pack expansion without packs");
486 ParsedTemplateArgument Result(*this);
487 Result.EllipsisLoc = EllipsisLoc;
488 return Result;
489}
490
Douglas Gregor788cd062009-11-11 01:00:40 +0000491static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef,
492 const ParsedTemplateArgument &Arg) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000493
Douglas Gregor788cd062009-11-11 01:00:40 +0000494 switch (Arg.getKind()) {
495 case ParsedTemplateArgument::Type: {
John McCalla93c9342009-12-07 02:54:59 +0000496 TypeSourceInfo *DI;
Douglas Gregor788cd062009-11-11 01:00:40 +0000497 QualType T = SemaRef.GetTypeFromParser(Arg.getAsType(), &DI);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000498 if (!DI)
John McCalla93c9342009-12-07 02:54:59 +0000499 DI = SemaRef.Context.getTrivialTypeSourceInfo(T, Arg.getLocation());
Douglas Gregor788cd062009-11-11 01:00:40 +0000500 return TemplateArgumentLoc(TemplateArgument(T), DI);
501 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000502
Douglas Gregor788cd062009-11-11 01:00:40 +0000503 case ParsedTemplateArgument::NonType: {
504 Expr *E = static_cast<Expr *>(Arg.getAsExpr());
505 return TemplateArgumentLoc(TemplateArgument(E), E);
506 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000507
Douglas Gregor788cd062009-11-11 01:00:40 +0000508 case ParsedTemplateArgument::Template: {
John McCall2b5289b2010-08-23 07:28:44 +0000509 TemplateName Template = Arg.getAsTemplate().get();
Douglas Gregor2be29f42011-01-14 23:41:42 +0000510 TemplateArgument TArg;
511 if (Arg.getEllipsisLoc().isValid())
David Blaikiedc84cd52013-02-20 22:23:23 +0000512 TArg = TemplateArgument(Template, Optional<unsigned int>());
Douglas Gregor2be29f42011-01-14 23:41:42 +0000513 else
514 TArg = Template;
515 return TemplateArgumentLoc(TArg,
Douglas Gregorb6744ef2011-03-02 17:09:35 +0000516 Arg.getScopeSpec().getWithLocInContext(
517 SemaRef.Context),
Douglas Gregorba68eca2011-01-05 17:40:24 +0000518 Arg.getLocation(),
519 Arg.getEllipsisLoc());
Douglas Gregor788cd062009-11-11 01:00:40 +0000520 }
521 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000522
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +0000523 llvm_unreachable("Unhandled parsed template argument");
Douglas Gregor788cd062009-11-11 01:00:40 +0000524}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000525
Douglas Gregor788cd062009-11-11 01:00:40 +0000526/// \brief Translates template arguments as provided by the parser
527/// into template arguments used by semantic analysis.
John McCalld5532b62009-11-23 01:53:49 +0000528void Sema::translateTemplateArguments(const ASTTemplateArgsPtr &TemplateArgsIn,
529 TemplateArgumentListInfo &TemplateArgs) {
Douglas Gregor788cd062009-11-11 01:00:40 +0000530 for (unsigned I = 0, Last = TemplateArgsIn.size(); I != Last; ++I)
John McCalld5532b62009-11-23 01:53:49 +0000531 TemplateArgs.addArgument(translateTemplateArgument(*this,
532 TemplateArgsIn[I]));
Douglas Gregor788cd062009-11-11 01:00:40 +0000533}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000534
Richard Smithc7e863f2013-06-25 22:21:36 +0000535static void maybeDiagnoseTemplateParameterShadow(Sema &SemaRef, Scope *S,
536 SourceLocation Loc,
537 IdentifierInfo *Name) {
538 NamedDecl *PrevDecl = SemaRef.LookupSingleName(
539 S, Name, Loc, Sema::LookupOrdinaryName, Sema::ForRedeclaration);
540 if (PrevDecl && PrevDecl->isTemplateParameter())
541 SemaRef.DiagnoseTemplateParameterShadow(Loc, PrevDecl);
542}
543
Douglas Gregor72c3f312008-12-05 18:15:24 +0000544/// ActOnTypeParameter - Called when a C++ template type parameter
545/// (e.g., "typename T") has been parsed. Typename specifies whether
546/// the keyword "typename" was used to declare the type parameter
547/// (otherwise, "class" was used), and KeyLoc is the location of the
548/// "class" or "typename" keyword. ParamName is the name of the
549/// parameter (NULL indicates an unnamed template parameter) and
Chandler Carruth4fb86f82011-05-01 00:51:33 +0000550/// ParamNameLoc is the location of the parameter name (if any).
Douglas Gregor72c3f312008-12-05 18:15:24 +0000551/// If the type parameter has a default argument, it will be added
552/// later via ActOnTypeParameterDefault.
John McCalld226f652010-08-21 09:40:31 +0000553Decl *Sema::ActOnTypeParameter(Scope *S, bool Typename, bool Ellipsis,
554 SourceLocation EllipsisLoc,
555 SourceLocation KeyLoc,
556 IdentifierInfo *ParamName,
557 SourceLocation ParamNameLoc,
558 unsigned Depth, unsigned Position,
559 SourceLocation EqualLoc,
John McCallb3d87482010-08-24 05:47:05 +0000560 ParsedType DefaultArg) {
Mike Stump1eb44332009-09-09 15:08:12 +0000561 assert(S->isTemplateParamScope() &&
562 "Template type parameter not in template parameter scope!");
Douglas Gregor72c3f312008-12-05 18:15:24 +0000563 bool Invalid = false;
564
Douglas Gregorddc29e12009-02-06 22:42:48 +0000565 SourceLocation Loc = ParamNameLoc;
566 if (!ParamName)
567 Loc = KeyLoc;
568
Douglas Gregor72c3f312008-12-05 18:15:24 +0000569 TemplateTypeParmDecl *Param
John McCall7a9813c2010-01-22 00:28:27 +0000570 = TemplateTypeParmDecl::Create(Context, Context.getTranslationUnitDecl(),
Abramo Bagnara344577e2011-03-06 15:48:19 +0000571 KeyLoc, Loc, Depth, Position, ParamName,
572 Typename, Ellipsis);
Douglas Gregor9a299e02011-03-04 17:52:15 +0000573 Param->setAccess(AS_public);
Douglas Gregor72c3f312008-12-05 18:15:24 +0000574 if (Invalid)
575 Param->setInvalidDecl();
576
577 if (ParamName) {
Richard Smithc7e863f2013-06-25 22:21:36 +0000578 maybeDiagnoseTemplateParameterShadow(*this, S, ParamNameLoc, ParamName);
579
Douglas Gregor72c3f312008-12-05 18:15:24 +0000580 // Add the template parameter into the current scope.
John McCalld226f652010-08-21 09:40:31 +0000581 S->AddDecl(Param);
Douglas Gregor72c3f312008-12-05 18:15:24 +0000582 IdResolver.AddDecl(Param);
583 }
584
Douglas Gregor61c4d282011-01-05 15:48:55 +0000585 // C++0x [temp.param]p9:
586 // A default template-argument may be specified for any kind of
587 // template-parameter that is not a template parameter pack.
588 if (DefaultArg && Ellipsis) {
589 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
590 DefaultArg = ParsedType();
591 }
592
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000593 // Handle the default argument, if provided.
594 if (DefaultArg) {
595 TypeSourceInfo *DefaultTInfo;
596 GetTypeFromParser(DefaultArg, &DefaultTInfo);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000597
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000598 assert(DefaultTInfo && "expected source information for type");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000599
Douglas Gregor6f526752010-12-16 08:48:57 +0000600 // Check for unexpanded parameter packs.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000601 if (DiagnoseUnexpandedParameterPack(Loc, DefaultTInfo,
Douglas Gregor6f526752010-12-16 08:48:57 +0000602 UPPC_DefaultArgument))
603 return Param;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000604
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000605 // Check the template argument itself.
606 if (CheckTemplateArgument(Param, DefaultTInfo)) {
607 Param->setInvalidDecl();
John McCalld226f652010-08-21 09:40:31 +0000608 return Param;
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000609 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000610
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000611 Param->setDefaultArgument(DefaultTInfo, false);
612 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000613
John McCalld226f652010-08-21 09:40:31 +0000614 return Param;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000615}
616
Douglas Gregor2943aed2009-03-03 04:44:36 +0000617/// \brief Check that the type of a non-type template parameter is
618/// well-formed.
619///
620/// \returns the (possibly-promoted) parameter type if valid;
621/// otherwise, produces a diagnostic and returns a NULL type.
Mike Stump1eb44332009-09-09 15:08:12 +0000622QualType
Douglas Gregor2943aed2009-03-03 04:44:36 +0000623Sema::CheckNonTypeTemplateParameterType(QualType T, SourceLocation Loc) {
Douglas Gregora481ec42010-05-23 19:57:01 +0000624 // We don't allow variably-modified types as the type of non-type template
625 // parameters.
626 if (T->isVariablyModifiedType()) {
627 Diag(Loc, diag::err_variably_modified_nontype_template_param)
628 << T;
629 return QualType();
630 }
631
Douglas Gregor2943aed2009-03-03 04:44:36 +0000632 // C++ [temp.param]p4:
633 //
634 // A non-type template-parameter shall have one of the following
635 // (optionally cv-qualified) types:
636 //
637 // -- integral or enumeration type,
Douglas Gregor2ade35e2010-06-16 00:17:44 +0000638 if (T->isIntegralOrEnumerationType() ||
Mike Stump1eb44332009-09-09 15:08:12 +0000639 // -- pointer to object or pointer to function,
Eli Friedman13578692010-08-05 02:49:48 +0000640 T->isPointerType() ||
Mike Stump1eb44332009-09-09 15:08:12 +0000641 // -- reference to object or reference to function,
Douglas Gregor2943aed2009-03-03 04:44:36 +0000642 T->isReferenceType() ||
Douglas Gregor84ee2ee2011-05-21 23:15:46 +0000643 // -- pointer to member,
Douglas Gregor2943aed2009-03-03 04:44:36 +0000644 T->isMemberPointerType() ||
Douglas Gregor84ee2ee2011-05-21 23:15:46 +0000645 // -- std::nullptr_t.
646 T->isNullPtrType() ||
Douglas Gregor2943aed2009-03-03 04:44:36 +0000647 // If T is a dependent type, we can't do the check now, so we
648 // assume that it is well-formed.
Richard Smithe37f4842012-03-13 07:21:50 +0000649 T->isDependentType()) {
650 // C++ [temp.param]p5: The top-level cv-qualifiers on the template-parameter
651 // are ignored when determining its type.
652 return T.getUnqualifiedType();
653 }
654
Douglas Gregor2943aed2009-03-03 04:44:36 +0000655 // C++ [temp.param]p8:
656 //
657 // A non-type template-parameter of type "array of T" or
658 // "function returning T" is adjusted to be of type "pointer to
659 // T" or "pointer to function returning T", respectively.
660 else if (T->isArrayType())
661 // FIXME: Keep the type prior to promotion?
662 return Context.getArrayDecayedType(T);
663 else if (T->isFunctionType())
664 // FIXME: Keep the type prior to promotion?
665 return Context.getPointerType(T);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000666
Douglas Gregor2943aed2009-03-03 04:44:36 +0000667 Diag(Loc, diag::err_template_nontype_parm_bad_type)
668 << T;
669
670 return QualType();
671}
672
John McCalld226f652010-08-21 09:40:31 +0000673Decl *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
674 unsigned Depth,
675 unsigned Position,
676 SourceLocation EqualLoc,
John McCall9ae2f072010-08-23 23:25:46 +0000677 Expr *Default) {
John McCallbf1a0282010-06-04 23:28:52 +0000678 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
679 QualType T = TInfo->getType();
Douglas Gregor72c3f312008-12-05 18:15:24 +0000680
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000681 assert(S->isTemplateParamScope() &&
682 "Non-type template parameter not in template parameter scope!");
Douglas Gregor72c3f312008-12-05 18:15:24 +0000683 bool Invalid = false;
684
Douglas Gregor4d2abba2010-12-16 15:36:43 +0000685 T = CheckNonTypeTemplateParameterType(T, D.getIdentifierLoc());
686 if (T.isNull()) {
Douglas Gregor2943aed2009-03-03 04:44:36 +0000687 T = Context.IntTy; // Recover with an 'int' type.
Douglas Gregorceef30c2009-03-09 16:46:39 +0000688 Invalid = true;
689 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000690
Richard Smithc7e863f2013-06-25 22:21:36 +0000691 IdentifierInfo *ParamName = D.getIdentifier();
Douglas Gregor10738d32010-12-23 23:51:58 +0000692 bool IsParameterPack = D.hasEllipsis();
Douglas Gregor72c3f312008-12-05 18:15:24 +0000693 NonTypeTemplateParmDecl *Param
John McCall7a9813c2010-01-22 00:28:27 +0000694 = NonTypeTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
Daniel Dunbar96a00142012-03-09 18:35:03 +0000695 D.getLocStart(),
John McCall7a9813c2010-01-22 00:28:27 +0000696 D.getIdentifierLoc(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000697 Depth, Position, ParamName, T,
Douglas Gregor10738d32010-12-23 23:51:58 +0000698 IsParameterPack, TInfo);
Douglas Gregor9a299e02011-03-04 17:52:15 +0000699 Param->setAccess(AS_public);
Richard Smithc7e863f2013-06-25 22:21:36 +0000700
Douglas Gregor72c3f312008-12-05 18:15:24 +0000701 if (Invalid)
702 Param->setInvalidDecl();
703
Richard Smithc7e863f2013-06-25 22:21:36 +0000704 if (ParamName) {
705 maybeDiagnoseTemplateParameterShadow(*this, S, D.getIdentifierLoc(),
706 ParamName);
707
Douglas Gregor72c3f312008-12-05 18:15:24 +0000708 // Add the template parameter into the current scope.
John McCalld226f652010-08-21 09:40:31 +0000709 S->AddDecl(Param);
Douglas Gregor72c3f312008-12-05 18:15:24 +0000710 IdResolver.AddDecl(Param);
711 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000712
Douglas Gregor61c4d282011-01-05 15:48:55 +0000713 // C++0x [temp.param]p9:
714 // A default template-argument may be specified for any kind of
715 // template-parameter that is not a template parameter pack.
716 if (Default && IsParameterPack) {
717 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
718 Default = 0;
719 }
720
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000721 // Check the well-formedness of the default template argument, if provided.
Douglas Gregor10738d32010-12-23 23:51:58 +0000722 if (Default) {
Douglas Gregor6f526752010-12-16 08:48:57 +0000723 // Check for unexpanded parameter packs.
724 if (DiagnoseUnexpandedParameterPack(Default, UPPC_DefaultArgument))
725 return Param;
726
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000727 TemplateArgument Converted;
John Wiegley429bb272011-04-08 18:41:53 +0000728 ExprResult DefaultRes = CheckTemplateArgument(Param, Param->getType(), Default, Converted);
729 if (DefaultRes.isInvalid()) {
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000730 Param->setInvalidDecl();
John McCalld226f652010-08-21 09:40:31 +0000731 return Param;
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000732 }
John Wiegley429bb272011-04-08 18:41:53 +0000733 Default = DefaultRes.take();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000734
John McCall9ae2f072010-08-23 23:25:46 +0000735 Param->setDefaultArgument(Default, false);
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000736 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000737
John McCalld226f652010-08-21 09:40:31 +0000738 return Param;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000739}
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000740
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000741/// ActOnTemplateTemplateParameter - Called when a C++ template template
James Dennett699c9042012-06-15 07:13:21 +0000742/// parameter (e.g. T in template <template \<typename> class T> class array)
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000743/// has been parsed. S is the current scope.
John McCalld226f652010-08-21 09:40:31 +0000744Decl *Sema::ActOnTemplateTemplateParameter(Scope* S,
745 SourceLocation TmpLoc,
Richard Trieu90ab75b2011-09-09 03:18:59 +0000746 TemplateParameterList *Params,
Douglas Gregor61c4d282011-01-05 15:48:55 +0000747 SourceLocation EllipsisLoc,
John McCalld226f652010-08-21 09:40:31 +0000748 IdentifierInfo *Name,
749 SourceLocation NameLoc,
750 unsigned Depth,
751 unsigned Position,
752 SourceLocation EqualLoc,
Douglas Gregor61c4d282011-01-05 15:48:55 +0000753 ParsedTemplateArgument Default) {
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000754 assert(S->isTemplateParamScope() &&
755 "Template template parameter not in template parameter scope!");
756
757 // Construct the parameter object.
Douglas Gregor61c4d282011-01-05 15:48:55 +0000758 bool IsParameterPack = EllipsisLoc.isValid();
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000759 TemplateTemplateParmDecl *Param =
John McCall7a9813c2010-01-22 00:28:27 +0000760 TemplateTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000761 NameLoc.isInvalid()? TmpLoc : NameLoc,
762 Depth, Position, IsParameterPack,
Douglas Gregor61c4d282011-01-05 15:48:55 +0000763 Name, Params);
Douglas Gregor9a299e02011-03-04 17:52:15 +0000764 Param->setAccess(AS_public);
765
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000766 // If the template template parameter has a name, then link the identifier
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000767 // into the scope and lookup mechanisms.
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000768 if (Name) {
Richard Smithc7e863f2013-06-25 22:21:36 +0000769 maybeDiagnoseTemplateParameterShadow(*this, S, NameLoc, Name);
770
John McCalld226f652010-08-21 09:40:31 +0000771 S->AddDecl(Param);
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000772 IdResolver.AddDecl(Param);
773 }
774
Douglas Gregor6f526752010-12-16 08:48:57 +0000775 if (Params->size() == 0) {
776 Diag(Param->getLocation(), diag::err_template_template_parm_no_parms)
777 << SourceRange(Params->getLAngleLoc(), Params->getRAngleLoc());
778 Param->setInvalidDecl();
779 }
780
Douglas Gregor61c4d282011-01-05 15:48:55 +0000781 // C++0x [temp.param]p9:
782 // A default template-argument may be specified for any kind of
783 // template-parameter that is not a template parameter pack.
784 if (IsParameterPack && !Default.isInvalid()) {
785 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
786 Default = ParsedTemplateArgument();
787 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000788
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000789 if (!Default.isInvalid()) {
790 // Check only that we have a template template argument. We don't want to
791 // try to check well-formedness now, because our template template parameter
792 // might have dependent types in its template parameters, which we wouldn't
793 // be able to match now.
794 //
795 // If none of the template template parameter's template arguments mention
796 // other template parameters, we could actually perform more checking here.
797 // However, it isn't worth doing.
798 TemplateArgumentLoc DefaultArg = translateTemplateArgument(*this, Default);
799 if (DefaultArg.getArgument().getAsTemplate().isNull()) {
800 Diag(DefaultArg.getLocation(), diag::err_template_arg_not_class_template)
801 << DefaultArg.getSourceRange();
John McCalld226f652010-08-21 09:40:31 +0000802 return Param;
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000803 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000804
Douglas Gregor6f526752010-12-16 08:48:57 +0000805 // Check for unexpanded parameter packs.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000806 if (DiagnoseUnexpandedParameterPack(DefaultArg.getLocation(),
Douglas Gregor6f526752010-12-16 08:48:57 +0000807 DefaultArg.getArgument().getAsTemplate(),
808 UPPC_DefaultArgument))
809 return Param;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000810
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000811 Param->setDefaultArgument(DefaultArg, false);
Douglas Gregord684b002009-02-10 19:49:53 +0000812 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000813
John McCalld226f652010-08-21 09:40:31 +0000814 return Param;
Douglas Gregord684b002009-02-10 19:49:53 +0000815}
816
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000817/// ActOnTemplateParameterList - Builds a TemplateParameterList that
818/// contains the template parameters in Params/NumParams.
Richard Trieu90ab75b2011-09-09 03:18:59 +0000819TemplateParameterList *
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000820Sema::ActOnTemplateParameterList(unsigned Depth,
821 SourceLocation ExportLoc,
Mike Stump1eb44332009-09-09 15:08:12 +0000822 SourceLocation TemplateLoc,
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000823 SourceLocation LAngleLoc,
John McCalld226f652010-08-21 09:40:31 +0000824 Decl **Params, unsigned NumParams,
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000825 SourceLocation RAngleLoc) {
826 if (ExportLoc.isValid())
Douglas Gregor51ffb0c2009-11-25 18:55:14 +0000827 Diag(ExportLoc, diag::warn_template_export_unsupported);
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000828
Douglas Gregorddc29e12009-02-06 22:42:48 +0000829 return TemplateParameterList::Create(Context, TemplateLoc, LAngleLoc,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000830 (NamedDecl**)Params, NumParams,
Douglas Gregorbf4ea562009-09-15 16:23:51 +0000831 RAngleLoc);
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000832}
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000833
John McCallb6217662010-03-15 10:12:16 +0000834static void SetNestedNameSpecifier(TagDecl *T, const CXXScopeSpec &SS) {
835 if (SS.isSet())
Douglas Gregorc22b5ff2011-02-25 02:25:35 +0000836 T->setQualifierInfo(SS.getWithLocInContext(T->getASTContext()));
John McCallb6217662010-03-15 10:12:16 +0000837}
838
John McCallf312b1e2010-08-26 23:41:50 +0000839DeclResult
John McCall0f434ec2009-07-31 02:45:11 +0000840Sema::CheckClassTemplate(Scope *S, unsigned TagSpec, TagUseKind TUK,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +0000841 SourceLocation KWLoc, CXXScopeSpec &SS,
Douglas Gregorddc29e12009-02-06 22:42:48 +0000842 IdentifierInfo *Name, SourceLocation NameLoc,
843 AttributeList *Attr,
Douglas Gregor05396e22009-08-25 17:23:04 +0000844 TemplateParameterList *TemplateParams,
Douglas Gregore7612302011-09-09 19:05:14 +0000845 AccessSpecifier AS, SourceLocation ModulePrivateLoc,
Abramo Bagnarac57c17d2011-03-10 13:28:31 +0000846 unsigned NumOuterTemplateParamLists,
847 TemplateParameterList** OuterTemplateParamLists) {
Mike Stump1eb44332009-09-09 15:08:12 +0000848 assert(TemplateParams && TemplateParams->size() > 0 &&
Douglas Gregor05396e22009-08-25 17:23:04 +0000849 "No template parameters");
John McCall0f434ec2009-07-31 02:45:11 +0000850 assert(TUK != TUK_Reference && "Can only declare or define class templates");
Douglas Gregord684b002009-02-10 19:49:53 +0000851 bool Invalid = false;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000852
853 // Check that we can declare a template here.
Douglas Gregor05396e22009-08-25 17:23:04 +0000854 if (CheckTemplateDeclScope(S, TemplateParams))
Douglas Gregor212e81c2009-03-25 00:13:59 +0000855 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000856
Abramo Bagnara465d41b2010-05-11 21:36:43 +0000857 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
858 assert(Kind != TTK_Enum && "can't build template of enumerated type");
Douglas Gregorddc29e12009-02-06 22:42:48 +0000859
860 // There is no such thing as an unnamed class template.
861 if (!Name) {
862 Diag(KWLoc, diag::err_template_unnamed_class);
Douglas Gregor212e81c2009-03-25 00:13:59 +0000863 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000864 }
865
Richard Smith71c598f2012-04-21 01:27:54 +0000866 // Find any previous declaration with this name. For a friend with no
867 // scope explicitly specified, we only look for tag declarations (per
868 // C++11 [basic.lookup.elab]p2).
Douglas Gregor05396e22009-08-25 17:23:04 +0000869 DeclContext *SemanticContext;
Richard Smith71c598f2012-04-21 01:27:54 +0000870 LookupResult Previous(*this, Name, NameLoc,
871 (SS.isEmpty() && TUK == TUK_Friend)
872 ? LookupTagName : LookupOrdinaryName,
John McCall7d384dd2009-11-18 07:57:50 +0000873 ForRedeclaration);
Douglas Gregor05396e22009-08-25 17:23:04 +0000874 if (SS.isNotEmpty() && !SS.isInvalid()) {
875 SemanticContext = computeDeclContext(SS, true);
876 if (!SemanticContext) {
Douglas Gregor8b0fa522012-03-30 16:20:47 +0000877 // FIXME: Horrible, horrible hack! We can't currently represent this
878 // in the AST, and historically we have just ignored such friend
879 // class templates, so don't complain here.
880 if (TUK != TUK_Friend)
881 Diag(NameLoc, diag::err_template_qualified_declarator_no_match)
882 << SS.getScopeRep() << SS.getRange();
Douglas Gregor05396e22009-08-25 17:23:04 +0000883 return true;
884 }
Mike Stump1eb44332009-09-09 15:08:12 +0000885
John McCall77bb1aa2010-05-01 00:40:08 +0000886 if (RequireCompleteDeclContext(SS, SemanticContext))
887 return true;
888
Douglas Gregor20606502011-10-14 15:31:12 +0000889 // If we're adding a template to a dependent context, we may need to
890 // rebuilding some of the types used within the template parameter list,
891 // now that we know what the current instantiation is.
892 if (SemanticContext->isDependentContext()) {
893 ContextRAII SavedContext(*this, SemanticContext);
894 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams))
895 Invalid = true;
Douglas Gregor69605872012-03-28 16:01:27 +0000896 } else if (TUK != TUK_Friend && TUK != TUK_Reference)
897 diagnoseQualifiedDeclaration(SS, SemanticContext, Name, NameLoc);
Richard Smith71c598f2012-04-21 01:27:54 +0000898
John McCalla24dc2e2009-11-17 02:14:36 +0000899 LookupQualifiedName(Previous, SemanticContext);
Douglas Gregor05396e22009-08-25 17:23:04 +0000900 } else {
901 SemanticContext = CurContext;
John McCalla24dc2e2009-11-17 02:14:36 +0000902 LookupName(Previous, S);
Douglas Gregor05396e22009-08-25 17:23:04 +0000903 }
Mike Stump1eb44332009-09-09 15:08:12 +0000904
Douglas Gregor57265e32010-04-12 16:00:01 +0000905 if (Previous.isAmbiguous())
906 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000907
Douglas Gregorddc29e12009-02-06 22:42:48 +0000908 NamedDecl *PrevDecl = 0;
909 if (Previous.begin() != Previous.end())
Douglas Gregor57265e32010-04-12 16:00:01 +0000910 PrevDecl = (*Previous.begin())->getUnderlyingDecl();
Douglas Gregorddc29e12009-02-06 22:42:48 +0000911
Douglas Gregorddc29e12009-02-06 22:42:48 +0000912 // If there is a previous declaration with the same name, check
913 // whether this is a valid redeclaration.
Mike Stump1eb44332009-09-09 15:08:12 +0000914 ClassTemplateDecl *PrevClassTemplate
Douglas Gregorddc29e12009-02-06 22:42:48 +0000915 = dyn_cast_or_null<ClassTemplateDecl>(PrevDecl);
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000916
917 // We may have found the injected-class-name of a class template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000918 // class template partial specialization, or class template specialization.
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000919 // In these cases, grab the template that is being defined or specialized.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000920 if (!PrevClassTemplate && PrevDecl && isa<CXXRecordDecl>(PrevDecl) &&
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000921 cast<CXXRecordDecl>(PrevDecl)->isInjectedClassName()) {
922 PrevDecl = cast<CXXRecordDecl>(PrevDecl->getDeclContext());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000923 PrevClassTemplate
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000924 = cast<CXXRecordDecl>(PrevDecl)->getDescribedClassTemplate();
925 if (!PrevClassTemplate && isa<ClassTemplateSpecializationDecl>(PrevDecl)) {
926 PrevClassTemplate
927 = cast<ClassTemplateSpecializationDecl>(PrevDecl)
928 ->getSpecializedTemplate();
929 }
930 }
931
John McCall65c49462009-12-18 11:25:59 +0000932 if (TUK == TUK_Friend) {
John McCalle129d442009-12-17 23:21:11 +0000933 // C++ [namespace.memdef]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000934 // [...] When looking for a prior declaration of a class or a function
935 // declared as a friend, and when the name of the friend class or
John McCalle129d442009-12-17 23:21:11 +0000936 // function is neither a qualified name nor a template-id, scopes outside
937 // the innermost enclosing namespace scope are not considered.
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000938 if (!SS.isSet()) {
939 DeclContext *OutermostContext = CurContext;
940 while (!OutermostContext->isFileContext())
941 OutermostContext = OutermostContext->getLookupParent();
John McCall65c49462009-12-18 11:25:59 +0000942
Richard Smithc93e0142012-04-20 07:12:26 +0000943 if (PrevDecl &&
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000944 (OutermostContext->Equals(PrevDecl->getDeclContext()) ||
945 OutermostContext->Encloses(PrevDecl->getDeclContext()))) {
946 SemanticContext = PrevDecl->getDeclContext();
947 } else {
948 // Declarations in outer scopes don't matter. However, the outermost
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000949 // context we computed is the semantic context for our new
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000950 // declaration.
951 PrevDecl = PrevClassTemplate = 0;
952 SemanticContext = OutermostContext;
Richard Smith71c598f2012-04-21 01:27:54 +0000953
954 // Check that the chosen semantic context doesn't already contain a
955 // declaration of this name as a non-tag type.
956 LookupResult Previous(*this, Name, NameLoc, LookupOrdinaryName,
957 ForRedeclaration);
958 DeclContext *LookupContext = SemanticContext;
959 while (LookupContext->isTransparentContext())
960 LookupContext = LookupContext->getLookupParent();
961 LookupQualifiedName(Previous, LookupContext);
962
963 if (Previous.isAmbiguous())
964 return true;
965
966 if (Previous.begin() != Previous.end())
967 PrevDecl = (*Previous.begin())->getUnderlyingDecl();
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000968 }
John McCalle129d442009-12-17 23:21:11 +0000969 }
John McCalle129d442009-12-17 23:21:11 +0000970 } else if (PrevDecl && !isDeclInScope(PrevDecl, SemanticContext, S))
971 PrevDecl = PrevClassTemplate = 0;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000972
Douglas Gregorddc29e12009-02-06 22:42:48 +0000973 if (PrevClassTemplate) {
Richard Smith6e21b162012-04-22 02:13:50 +0000974 // Ensure that the template parameter lists are compatible. Skip this check
975 // for a friend in a dependent context: the template parameter list itself
976 // could be dependent.
977 if (!(TUK == TUK_Friend && CurContext->isDependentContext()) &&
978 !TemplateParameterListsAreEqual(TemplateParams,
Douglas Gregorddc29e12009-02-06 22:42:48 +0000979 PrevClassTemplate->getTemplateParameters(),
Douglas Gregorfb898e12009-11-12 16:20:59 +0000980 /*Complain=*/true,
981 TPL_TemplateMatch))
Douglas Gregor212e81c2009-03-25 00:13:59 +0000982 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000983
984 // C++ [temp.class]p4:
985 // In a redeclaration, partial specialization, explicit
986 // specialization or explicit instantiation of a class template,
987 // the class-key shall agree in kind with the original class
988 // template declaration (7.1.5.3).
989 RecordDecl *PrevRecordDecl = PrevClassTemplate->getTemplatedDecl();
Richard Trieubbf34c02011-06-10 03:11:26 +0000990 if (!isAcceptableTagRedeclaration(PrevRecordDecl, Kind,
991 TUK == TUK_Definition, KWLoc, *Name)) {
Mike Stump1eb44332009-09-09 15:08:12 +0000992 Diag(KWLoc, diag::err_use_with_wrong_tag)
Douglas Gregora3a83512009-04-01 23:51:29 +0000993 << Name
Douglas Gregor849b2432010-03-31 17:46:05 +0000994 << FixItHint::CreateReplacement(KWLoc, PrevRecordDecl->getKindName());
Douglas Gregorddc29e12009-02-06 22:42:48 +0000995 Diag(PrevRecordDecl->getLocation(), diag::note_previous_use);
Douglas Gregora3a83512009-04-01 23:51:29 +0000996 Kind = PrevRecordDecl->getTagKind();
Douglas Gregorddc29e12009-02-06 22:42:48 +0000997 }
998
Douglas Gregorddc29e12009-02-06 22:42:48 +0000999 // Check for redefinition of this class template.
John McCall0f434ec2009-07-31 02:45:11 +00001000 if (TUK == TUK_Definition) {
Douglas Gregor952b0172010-02-11 01:04:33 +00001001 if (TagDecl *Def = PrevRecordDecl->getDefinition()) {
Douglas Gregorddc29e12009-02-06 22:42:48 +00001002 Diag(NameLoc, diag::err_redefinition) << Name;
1003 Diag(Def->getLocation(), diag::note_previous_definition);
1004 // FIXME: Would it make sense to try to "forget" the previous
1005 // definition, as part of error recovery?
Douglas Gregor212e81c2009-03-25 00:13:59 +00001006 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +00001007 }
Douglas Gregor6311d2b2011-09-09 18:32:39 +00001008 }
Douglas Gregorddc29e12009-02-06 22:42:48 +00001009 } else if (PrevDecl && PrevDecl->isTemplateParameter()) {
1010 // Maybe we will complain about the shadowed template parameter.
1011 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl);
1012 // Just pretend that we didn't see the previous declaration.
1013 PrevDecl = 0;
1014 } else if (PrevDecl) {
1015 // C++ [temp]p5:
1016 // A class template shall not have the same name as any other
1017 // template, class, function, object, enumeration, enumerator,
1018 // namespace, or type in the same scope (3.3), except as specified
1019 // in (14.5.4).
1020 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
1021 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
Douglas Gregor212e81c2009-03-25 00:13:59 +00001022 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +00001023 }
1024
Douglas Gregord684b002009-02-10 19:49:53 +00001025 // Check the template parameter list of this declaration, possibly
1026 // merging in the template parameter list from the previous class
Richard Smith6e21b162012-04-22 02:13:50 +00001027 // template declaration. Skip this check for a friend in a dependent
1028 // context, because the template parameter list might be dependent.
1029 if (!(TUK == TUK_Friend && CurContext->isDependentContext()) &&
David Majnemer87b12b22013-06-25 22:08:55 +00001030 CheckTemplateParameterList(
1031 TemplateParams,
1032 PrevClassTemplate ? PrevClassTemplate->getTemplateParameters() : 0,
1033 (SS.isSet() && SemanticContext && SemanticContext->isRecord() &&
1034 SemanticContext->isDependentContext())
1035 ? TPC_ClassTemplateMember
1036 : TUK == TUK_Friend ? TPC_FriendClassTemplate
1037 : TPC_ClassTemplate))
Douglas Gregord684b002009-02-10 19:49:53 +00001038 Invalid = true;
Mike Stump1eb44332009-09-09 15:08:12 +00001039
Douglas Gregor57265e32010-04-12 16:00:01 +00001040 if (SS.isSet()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001041 // If the name of the template was qualified, we must be defining the
Douglas Gregor57265e32010-04-12 16:00:01 +00001042 // template out-of-line.
Richard Smith6e21b162012-04-22 02:13:50 +00001043 if (!SS.isInvalid() && !Invalid && !PrevClassTemplate) {
1044 Diag(NameLoc, TUK == TUK_Friend ? diag::err_friend_decl_does_not_match
Richard Smith4e9686b2013-08-09 04:35:01 +00001045 : diag::err_member_decl_does_not_match)
1046 << Name << SemanticContext << /*IsDefinition*/true << SS.getRange();
Douglas Gregorea9f54a2011-11-01 21:35:16 +00001047 Invalid = true;
1048 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001049 }
1050
Mike Stump1eb44332009-09-09 15:08:12 +00001051 CXXRecordDecl *NewClass =
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00001052 CXXRecordDecl::Create(Context, Kind, SemanticContext, KWLoc, NameLoc, Name,
Mike Stump1eb44332009-09-09 15:08:12 +00001053 PrevClassTemplate?
Douglas Gregoraafc0cc2009-05-15 19:11:46 +00001054 PrevClassTemplate->getTemplatedDecl() : 0,
1055 /*DelayTypeCreation=*/true);
John McCallb6217662010-03-15 10:12:16 +00001056 SetNestedNameSpecifier(NewClass, SS);
Abramo Bagnarac57c17d2011-03-10 13:28:31 +00001057 if (NumOuterTemplateParamLists > 0)
1058 NewClass->setTemplateParameterListsInfo(Context,
1059 NumOuterTemplateParamLists,
1060 OuterTemplateParamLists);
Douglas Gregorddc29e12009-02-06 22:42:48 +00001061
Eli Friedman572ae0a2012-02-10 02:02:21 +00001062 // Add alignment attributes if necessary; these attributes are checked when
1063 // the ASTContext lays out the structure.
Eli Friedman2016c8c2012-08-08 21:08:34 +00001064 if (TUK == TUK_Definition) {
1065 AddAlignmentAttributesForRecord(NewClass);
1066 AddMsStructLayoutForRecord(NewClass);
1067 }
Eli Friedman572ae0a2012-02-10 02:02:21 +00001068
Douglas Gregorddc29e12009-02-06 22:42:48 +00001069 ClassTemplateDecl *NewTemplate
1070 = ClassTemplateDecl::Create(Context, SemanticContext, NameLoc,
1071 DeclarationName(Name), TemplateParams,
Douglas Gregor5953d8b2009-03-19 17:26:29 +00001072 NewClass, PrevClassTemplate);
Douglas Gregorbefc20e2009-03-26 00:10:35 +00001073 NewClass->setDescribedClassTemplate(NewTemplate);
Douglas Gregor6311d2b2011-09-09 18:32:39 +00001074
Douglas Gregor2ccd89c2011-12-20 18:11:52 +00001075 if (ModulePrivateLoc.isValid())
Douglas Gregor6311d2b2011-09-09 18:32:39 +00001076 NewTemplate->setModulePrivate();
Douglas Gregor8d267c52011-09-09 02:06:17 +00001077
Douglas Gregoraafc0cc2009-05-15 19:11:46 +00001078 // Build the type for the class template declaration now.
Douglas Gregor24bae922010-07-08 18:37:38 +00001079 QualType T = NewTemplate->getInjectedClassNameSpecialization();
John McCall3cb0ebd2010-03-10 03:28:59 +00001080 T = Context.getInjectedClassNameType(NewClass, T);
Douglas Gregoraafc0cc2009-05-15 19:11:46 +00001081 assert(T->isDependentType() && "Class template type is not dependent?");
1082 (void)T;
1083
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001084 // If we are providing an explicit specialization of a member that is a
Douglas Gregorfd056bc2009-10-13 16:30:37 +00001085 // class template, make a note of that.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001086 if (PrevClassTemplate &&
Douglas Gregorfd056bc2009-10-13 16:30:37 +00001087 PrevClassTemplate->getInstantiatedFromMemberTemplate())
1088 PrevClassTemplate->setMemberSpecialization();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001089
Anders Carlsson4cbe82c2009-03-26 01:24:28 +00001090 // Set the access specifier.
Douglas Gregor42acead2012-03-17 23:06:31 +00001091 if (!Invalid && TUK != TUK_Friend && NewTemplate->getDeclContext()->isRecord())
John McCall05b23ea2009-09-14 21:59:20 +00001092 SetMemberAccessSpecifier(NewTemplate, PrevClassTemplate, AS);
Mike Stump1eb44332009-09-09 15:08:12 +00001093
Douglas Gregorddc29e12009-02-06 22:42:48 +00001094 // Set the lexical context of these templates
1095 NewClass->setLexicalDeclContext(CurContext);
1096 NewTemplate->setLexicalDeclContext(CurContext);
1097
John McCall0f434ec2009-07-31 02:45:11 +00001098 if (TUK == TUK_Definition)
Douglas Gregorddc29e12009-02-06 22:42:48 +00001099 NewClass->startDefinition();
1100
1101 if (Attr)
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00001102 ProcessDeclAttributeList(S, NewClass, Attr);
Douglas Gregorddc29e12009-02-06 22:42:48 +00001103
Rafael Espindola4bda1d82012-08-22 14:52:14 +00001104 if (PrevClassTemplate)
1105 mergeDeclAttributes(NewClass, PrevClassTemplate->getTemplatedDecl());
1106
Rafael Espindola6b603702012-07-13 18:04:45 +00001107 AddPushedVisibilityAttribute(NewClass);
1108
John McCall05b23ea2009-09-14 21:59:20 +00001109 if (TUK != TUK_Friend)
1110 PushOnScopeChains(NewTemplate, S);
1111 else {
Douglas Gregord85bea22009-09-26 06:47:28 +00001112 if (PrevClassTemplate && PrevClassTemplate->getAccess() != AS_none) {
John McCall05b23ea2009-09-14 21:59:20 +00001113 NewTemplate->setAccess(PrevClassTemplate->getAccess());
Douglas Gregord85bea22009-09-26 06:47:28 +00001114 NewClass->setAccess(PrevClassTemplate->getAccess());
1115 }
John McCall05b23ea2009-09-14 21:59:20 +00001116
Richard Smith22050f22013-07-17 23:53:16 +00001117 NewTemplate->setObjectOfFriendDecl();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001118
John McCall05b23ea2009-09-14 21:59:20 +00001119 // Friend templates are visible in fairly strange ways.
1120 if (!CurContext->isDependentContext()) {
Sebastian Redl7a126a42010-08-31 00:36:30 +00001121 DeclContext *DC = SemanticContext->getRedeclContext();
Richard Smith1b7f9cb2012-03-13 03:12:56 +00001122 DC->makeDeclVisibleInContext(NewTemplate);
John McCall05b23ea2009-09-14 21:59:20 +00001123 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
1124 PushOnScopeChains(NewTemplate, EnclosingScope,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001125 /* AddToContext = */ false);
John McCall05b23ea2009-09-14 21:59:20 +00001126 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001127
Douglas Gregord85bea22009-09-26 06:47:28 +00001128 FriendDecl *Friend = FriendDecl::Create(Context, CurContext,
1129 NewClass->getLocation(),
1130 NewTemplate,
1131 /*FIXME:*/NewClass->getLocation());
1132 Friend->setAccess(AS_public);
1133 CurContext->addDecl(Friend);
John McCall05b23ea2009-09-14 21:59:20 +00001134 }
Douglas Gregorddc29e12009-02-06 22:42:48 +00001135
Douglas Gregord684b002009-02-10 19:49:53 +00001136 if (Invalid) {
1137 NewTemplate->setInvalidDecl();
1138 NewClass->setInvalidDecl();
1139 }
Rafael Espindolad3d02dd2012-07-13 01:19:08 +00001140
Dmitri Gribenko96b09862012-07-31 22:37:06 +00001141 ActOnDocumentableDecl(NewTemplate);
1142
John McCalld226f652010-08-21 09:40:31 +00001143 return NewTemplate;
Douglas Gregorddc29e12009-02-06 22:42:48 +00001144}
1145
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001146/// \brief Diagnose the presence of a default template argument on a
1147/// template parameter, which is ill-formed in certain contexts.
1148///
1149/// \returns true if the default template argument should be dropped.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001150static bool DiagnoseDefaultTemplateArgument(Sema &S,
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001151 Sema::TemplateParamListContext TPC,
1152 SourceLocation ParamLoc,
1153 SourceRange DefArgRange) {
1154 switch (TPC) {
1155 case Sema::TPC_ClassTemplate:
Larisse Voufoef4579c2013-08-06 01:03:05 +00001156 case Sema::TPC_VarTemplate:
Richard Smith3e4c6c42011-05-05 21:57:07 +00001157 case Sema::TPC_TypeAliasTemplate:
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001158 return false;
1159
1160 case Sema::TPC_FunctionTemplate:
Douglas Gregord89d86f2011-02-04 04:20:44 +00001161 case Sema::TPC_FriendFunctionTemplateDefinition:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001162 // C++ [temp.param]p9:
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001163 // A default template-argument shall not be specified in a
1164 // function template declaration or a function template
1165 // definition [...]
Douglas Gregord89d86f2011-02-04 04:20:44 +00001166 // If a friend function template declaration specifies a default
1167 // template-argument, that declaration shall be a definition and shall be
1168 // the only declaration of the function template in the translation unit.
1169 // (C++98/03 doesn't have this wording; see DR226).
Richard Smith80ad52f2013-01-02 11:42:31 +00001170 S.Diag(ParamLoc, S.getLangOpts().CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00001171 diag::warn_cxx98_compat_template_parameter_default_in_function_template
1172 : diag::ext_template_parameter_default_in_function_template)
1173 << DefArgRange;
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001174 return false;
1175
1176 case Sema::TPC_ClassTemplateMember:
1177 // C++0x [temp.param]p9:
1178 // A default template-argument shall not be specified in the
1179 // template-parameter-lists of the definition of a member of a
1180 // class template that appears outside of the member's class.
1181 S.Diag(ParamLoc, diag::err_template_parameter_default_template_member)
1182 << DefArgRange;
1183 return true;
1184
David Majnemer87b12b22013-06-25 22:08:55 +00001185 case Sema::TPC_FriendClassTemplate:
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001186 case Sema::TPC_FriendFunctionTemplate:
1187 // C++ [temp.param]p9:
1188 // A default template-argument shall not be specified in a
1189 // friend template declaration.
1190 S.Diag(ParamLoc, diag::err_template_parameter_default_friend_template)
1191 << DefArgRange;
1192 return true;
1193
1194 // FIXME: C++0x [temp.param]p9 allows default template-arguments
1195 // for friend function templates if there is only a single
1196 // declaration (and it is a definition). Strange!
1197 }
1198
David Blaikie7530c032012-01-17 06:56:22 +00001199 llvm_unreachable("Invalid TemplateParamListContext!");
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001200}
1201
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001202/// \brief Check for unexpanded parameter packs within the template parameters
1203/// of a template template parameter, recursively.
Benjamin Kramerda57f3e2011-03-26 12:38:21 +00001204static bool DiagnoseUnexpandedParameterPacks(Sema &S,
1205 TemplateTemplateParmDecl *TTP) {
Richard Smith6964b3f2012-09-07 02:06:42 +00001206 // A template template parameter which is a parameter pack is also a pack
1207 // expansion.
1208 if (TTP->isParameterPack())
1209 return false;
1210
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001211 TemplateParameterList *Params = TTP->getTemplateParameters();
1212 for (unsigned I = 0, N = Params->size(); I != N; ++I) {
1213 NamedDecl *P = Params->getParam(I);
1214 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
Richard Smith6964b3f2012-09-07 02:06:42 +00001215 if (!NTTP->isParameterPack() &&
1216 S.DiagnoseUnexpandedParameterPack(NTTP->getLocation(),
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001217 NTTP->getTypeSourceInfo(),
1218 Sema::UPPC_NonTypeTemplateParameterType))
1219 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001220
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001221 continue;
1222 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001223
1224 if (TemplateTemplateParmDecl *InnerTTP
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001225 = dyn_cast<TemplateTemplateParmDecl>(P))
1226 if (DiagnoseUnexpandedParameterPacks(S, InnerTTP))
1227 return true;
1228 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001229
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001230 return false;
1231}
1232
Douglas Gregord684b002009-02-10 19:49:53 +00001233/// \brief Checks the validity of a template parameter list, possibly
1234/// considering the template parameter list from a previous
1235/// declaration.
1236///
1237/// If an "old" template parameter list is provided, it must be
1238/// equivalent (per TemplateParameterListsAreEqual) to the "new"
1239/// template parameter list.
1240///
1241/// \param NewParams Template parameter list for a new template
1242/// declaration. This template parameter list will be updated with any
1243/// default arguments that are carried through from the previous
1244/// template parameter list.
1245///
1246/// \param OldParams If provided, template parameter list from a
1247/// previous declaration of the same template. Default template
1248/// arguments will be merged from the old template parameter list to
1249/// the new template parameter list.
1250///
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001251/// \param TPC Describes the context in which we are checking the given
1252/// template parameter list.
1253///
Douglas Gregord684b002009-02-10 19:49:53 +00001254/// \returns true if an error occurred, false otherwise.
1255bool Sema::CheckTemplateParameterList(TemplateParameterList *NewParams,
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001256 TemplateParameterList *OldParams,
1257 TemplateParamListContext TPC) {
Douglas Gregord684b002009-02-10 19:49:53 +00001258 bool Invalid = false;
Mike Stump1eb44332009-09-09 15:08:12 +00001259
Douglas Gregord684b002009-02-10 19:49:53 +00001260 // C++ [temp.param]p10:
1261 // The set of default template-arguments available for use with a
1262 // template declaration or definition is obtained by merging the
1263 // default arguments from the definition (if in scope) and all
1264 // declarations in scope in the same way default function
1265 // arguments are (8.3.6).
1266 bool SawDefaultArgument = false;
1267 SourceLocation PreviousDefaultArgLoc;
Douglas Gregorc15cb382009-02-09 23:23:08 +00001268
Mike Stump1a35fde2009-02-11 23:03:27 +00001269 // Dummy initialization to avoid warnings.
Douglas Gregor1bc69132009-02-11 20:46:19 +00001270 TemplateParameterList::iterator OldParam = NewParams->end();
Douglas Gregord684b002009-02-10 19:49:53 +00001271 if (OldParams)
1272 OldParam = OldParams->begin();
1273
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001274 bool RemoveDefaultArguments = false;
Douglas Gregord684b002009-02-10 19:49:53 +00001275 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
1276 NewParamEnd = NewParams->end();
1277 NewParam != NewParamEnd; ++NewParam) {
1278 // Variables used to diagnose redundant default arguments
1279 bool RedundantDefaultArg = false;
1280 SourceLocation OldDefaultLoc;
1281 SourceLocation NewDefaultLoc;
1282
David Blaikie1368e582011-10-19 05:19:50 +00001283 // Variable used to diagnose missing default arguments
Douglas Gregord684b002009-02-10 19:49:53 +00001284 bool MissingDefaultArg = false;
1285
David Blaikie1368e582011-10-19 05:19:50 +00001286 // Variable used to diagnose non-final parameter packs
1287 bool SawParameterPack = false;
Anders Carlsson49d25572009-06-12 23:20:15 +00001288
Douglas Gregord684b002009-02-10 19:49:53 +00001289 if (TemplateTypeParmDecl *NewTypeParm
1290 = dyn_cast<TemplateTypeParmDecl>(*NewParam)) {
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001291 // Check the presence of a default argument here.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001292 if (NewTypeParm->hasDefaultArgument() &&
1293 DiagnoseDefaultTemplateArgument(*this, TPC,
1294 NewTypeParm->getLocation(),
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001295 NewTypeParm->getDefaultArgumentInfo()->getTypeLoc()
Abramo Bagnarabd054db2010-05-20 10:00:11 +00001296 .getSourceRange()))
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001297 NewTypeParm->removeDefaultArgument();
1298
1299 // Merge default arguments for template type parameters.
Mike Stump1eb44332009-09-09 15:08:12 +00001300 TemplateTypeParmDecl *OldTypeParm
Douglas Gregord684b002009-02-10 19:49:53 +00001301 = OldParams? cast<TemplateTypeParmDecl>(*OldParam) : 0;
Mike Stump1eb44332009-09-09 15:08:12 +00001302
Anders Carlsson49d25572009-06-12 23:20:15 +00001303 if (NewTypeParm->isParameterPack()) {
1304 assert(!NewTypeParm->hasDefaultArgument() &&
1305 "Parameter packs can't have a default argument!");
1306 SawParameterPack = true;
Mike Stump1eb44332009-09-09 15:08:12 +00001307 } else if (OldTypeParm && OldTypeParm->hasDefaultArgument() &&
John McCall833ca992009-10-29 08:12:44 +00001308 NewTypeParm->hasDefaultArgument()) {
Douglas Gregord684b002009-02-10 19:49:53 +00001309 OldDefaultLoc = OldTypeParm->getDefaultArgumentLoc();
1310 NewDefaultLoc = NewTypeParm->getDefaultArgumentLoc();
1311 SawDefaultArgument = true;
1312 RedundantDefaultArg = true;
1313 PreviousDefaultArgLoc = NewDefaultLoc;
1314 } else if (OldTypeParm && OldTypeParm->hasDefaultArgument()) {
1315 // Merge the default argument from the old declaration to the
1316 // new declaration.
John McCall833ca992009-10-29 08:12:44 +00001317 NewTypeParm->setDefaultArgument(OldTypeParm->getDefaultArgumentInfo(),
Douglas Gregord684b002009-02-10 19:49:53 +00001318 true);
1319 PreviousDefaultArgLoc = OldTypeParm->getDefaultArgumentLoc();
1320 } else if (NewTypeParm->hasDefaultArgument()) {
1321 SawDefaultArgument = true;
1322 PreviousDefaultArgLoc = NewTypeParm->getDefaultArgumentLoc();
1323 } else if (SawDefaultArgument)
1324 MissingDefaultArg = true;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00001325 } else if (NonTypeTemplateParmDecl *NewNonTypeParm
Douglas Gregord684b002009-02-10 19:49:53 +00001326 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) {
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001327 // Check for unexpanded parameter packs.
Richard Smith6964b3f2012-09-07 02:06:42 +00001328 if (!NewNonTypeParm->isParameterPack() &&
1329 DiagnoseUnexpandedParameterPack(NewNonTypeParm->getLocation(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001330 NewNonTypeParm->getTypeSourceInfo(),
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001331 UPPC_NonTypeTemplateParameterType)) {
1332 Invalid = true;
1333 continue;
1334 }
1335
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001336 // Check the presence of a default argument here.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001337 if (NewNonTypeParm->hasDefaultArgument() &&
1338 DiagnoseDefaultTemplateArgument(*this, TPC,
1339 NewNonTypeParm->getLocation(),
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001340 NewNonTypeParm->getDefaultArgument()->getSourceRange())) {
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001341 NewNonTypeParm->removeDefaultArgument();
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001342 }
1343
Mike Stumpac5fc7c2009-08-04 21:02:39 +00001344 // Merge default arguments for non-type template parameters
Douglas Gregord684b002009-02-10 19:49:53 +00001345 NonTypeTemplateParmDecl *OldNonTypeParm
1346 = OldParams? cast<NonTypeTemplateParmDecl>(*OldParam) : 0;
Douglas Gregor1ed64762011-01-05 16:19:19 +00001347 if (NewNonTypeParm->isParameterPack()) {
1348 assert(!NewNonTypeParm->hasDefaultArgument() &&
1349 "Parameter packs can't have a default argument!");
Richard Smith6964b3f2012-09-07 02:06:42 +00001350 if (!NewNonTypeParm->isPackExpansion())
1351 SawParameterPack = true;
Douglas Gregor1ed64762011-01-05 16:19:19 +00001352 } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument() &&
Richard Smith03c55be2013-07-22 03:31:14 +00001353 NewNonTypeParm->hasDefaultArgument()) {
Douglas Gregord684b002009-02-10 19:49:53 +00001354 OldDefaultLoc = OldNonTypeParm->getDefaultArgumentLoc();
1355 NewDefaultLoc = NewNonTypeParm->getDefaultArgumentLoc();
1356 SawDefaultArgument = true;
1357 RedundantDefaultArg = true;
1358 PreviousDefaultArgLoc = NewDefaultLoc;
1359 } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument()) {
1360 // Merge the default argument from the old declaration to the
1361 // new declaration.
Douglas Gregord684b002009-02-10 19:49:53 +00001362 // FIXME: We need to create a new kind of "default argument"
Douglas Gregor61c4d282011-01-05 15:48:55 +00001363 // expression that points to a previous non-type template
Douglas Gregord684b002009-02-10 19:49:53 +00001364 // parameter.
1365 NewNonTypeParm->setDefaultArgument(
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001366 OldNonTypeParm->getDefaultArgument(),
1367 /*Inherited=*/ true);
Douglas Gregord684b002009-02-10 19:49:53 +00001368 PreviousDefaultArgLoc = OldNonTypeParm->getDefaultArgumentLoc();
1369 } else if (NewNonTypeParm->hasDefaultArgument()) {
1370 SawDefaultArgument = true;
1371 PreviousDefaultArgLoc = NewNonTypeParm->getDefaultArgumentLoc();
1372 } else if (SawDefaultArgument)
Mike Stump1eb44332009-09-09 15:08:12 +00001373 MissingDefaultArg = true;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00001374 } else {
Douglas Gregord684b002009-02-10 19:49:53 +00001375 TemplateTemplateParmDecl *NewTemplateParm
1376 = cast<TemplateTemplateParmDecl>(*NewParam);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001377
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001378 // Check for unexpanded parameter packs, recursively.
Douglas Gregor65019ac2011-10-25 03:44:56 +00001379 if (::DiagnoseUnexpandedParameterPacks(*this, NewTemplateParm)) {
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001380 Invalid = true;
1381 continue;
1382 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001383
David Blaikie1368e582011-10-19 05:19:50 +00001384 // Check the presence of a default argument here.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001385 if (NewTemplateParm->hasDefaultArgument() &&
1386 DiagnoseDefaultTemplateArgument(*this, TPC,
1387 NewTemplateParm->getLocation(),
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001388 NewTemplateParm->getDefaultArgument().getSourceRange()))
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001389 NewTemplateParm->removeDefaultArgument();
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001390
1391 // Merge default arguments for template template parameters
Douglas Gregord684b002009-02-10 19:49:53 +00001392 TemplateTemplateParmDecl *OldTemplateParm
1393 = OldParams? cast<TemplateTemplateParmDecl>(*OldParam) : 0;
Douglas Gregor1ed64762011-01-05 16:19:19 +00001394 if (NewTemplateParm->isParameterPack()) {
1395 assert(!NewTemplateParm->hasDefaultArgument() &&
1396 "Parameter packs can't have a default argument!");
Richard Smith6964b3f2012-09-07 02:06:42 +00001397 if (!NewTemplateParm->isPackExpansion())
1398 SawParameterPack = true;
Douglas Gregor1ed64762011-01-05 16:19:19 +00001399 } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument() &&
Douglas Gregord684b002009-02-10 19:49:53 +00001400 NewTemplateParm->hasDefaultArgument()) {
Douglas Gregor788cd062009-11-11 01:00:40 +00001401 OldDefaultLoc = OldTemplateParm->getDefaultArgument().getLocation();
1402 NewDefaultLoc = NewTemplateParm->getDefaultArgument().getLocation();
Douglas Gregord684b002009-02-10 19:49:53 +00001403 SawDefaultArgument = true;
1404 RedundantDefaultArg = true;
1405 PreviousDefaultArgLoc = NewDefaultLoc;
1406 } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument()) {
1407 // Merge the default argument from the old declaration to the
1408 // new declaration.
Mike Stump390b4cc2009-05-16 07:39:55 +00001409 // FIXME: We need to create a new kind of "default argument" expression
1410 // that points to a previous template template parameter.
Douglas Gregord684b002009-02-10 19:49:53 +00001411 NewTemplateParm->setDefaultArgument(
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001412 OldTemplateParm->getDefaultArgument(),
1413 /*Inherited=*/ true);
Douglas Gregor788cd062009-11-11 01:00:40 +00001414 PreviousDefaultArgLoc
1415 = OldTemplateParm->getDefaultArgument().getLocation();
Douglas Gregord684b002009-02-10 19:49:53 +00001416 } else if (NewTemplateParm->hasDefaultArgument()) {
1417 SawDefaultArgument = true;
Douglas Gregor788cd062009-11-11 01:00:40 +00001418 PreviousDefaultArgLoc
1419 = NewTemplateParm->getDefaultArgument().getLocation();
Douglas Gregord684b002009-02-10 19:49:53 +00001420 } else if (SawDefaultArgument)
Mike Stump1eb44332009-09-09 15:08:12 +00001421 MissingDefaultArg = true;
Douglas Gregord684b002009-02-10 19:49:53 +00001422 }
1423
Richard Smith6964b3f2012-09-07 02:06:42 +00001424 // C++11 [temp.param]p11:
David Blaikie1368e582011-10-19 05:19:50 +00001425 // If a template parameter of a primary class template or alias template
1426 // is a template parameter pack, it shall be the last template parameter.
Richard Smith6964b3f2012-09-07 02:06:42 +00001427 if (SawParameterPack && (NewParam + 1) != NewParamEnd &&
Larisse Voufoef4579c2013-08-06 01:03:05 +00001428 (TPC == TPC_ClassTemplate || TPC == TPC_VarTemplate ||
1429 TPC == TPC_TypeAliasTemplate)) {
David Blaikie1368e582011-10-19 05:19:50 +00001430 Diag((*NewParam)->getLocation(),
1431 diag::err_template_param_pack_must_be_last_template_parameter);
1432 Invalid = true;
1433 }
1434
Douglas Gregord684b002009-02-10 19:49:53 +00001435 if (RedundantDefaultArg) {
1436 // C++ [temp.param]p12:
1437 // A template-parameter shall not be given default arguments
1438 // by two different declarations in the same scope.
1439 Diag(NewDefaultLoc, diag::err_template_param_default_arg_redefinition);
1440 Diag(OldDefaultLoc, diag::note_template_param_prev_default_arg);
1441 Invalid = true;
Douglas Gregoree5d21f2011-02-04 03:57:22 +00001442 } else if (MissingDefaultArg && TPC != TPC_FunctionTemplate) {
Douglas Gregord684b002009-02-10 19:49:53 +00001443 // C++ [temp.param]p11:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001444 // If a template-parameter of a class template has a default
1445 // template-argument, each subsequent template-parameter shall either
Douglas Gregorb49e4152011-01-05 16:21:17 +00001446 // have a default template-argument supplied or be a template parameter
1447 // pack.
Mike Stump1eb44332009-09-09 15:08:12 +00001448 Diag((*NewParam)->getLocation(),
Douglas Gregord684b002009-02-10 19:49:53 +00001449 diag::err_template_param_default_arg_missing);
1450 Diag(PreviousDefaultArgLoc, diag::note_template_param_prev_default_arg);
1451 Invalid = true;
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001452 RemoveDefaultArguments = true;
Douglas Gregord684b002009-02-10 19:49:53 +00001453 }
1454
1455 // If we have an old template parameter list that we're merging
1456 // in, move on to the next parameter.
1457 if (OldParams)
1458 ++OldParam;
1459 }
1460
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001461 // We were missing some default arguments at the end of the list, so remove
1462 // all of the default arguments.
1463 if (RemoveDefaultArguments) {
1464 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
1465 NewParamEnd = NewParams->end();
1466 NewParam != NewParamEnd; ++NewParam) {
1467 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*NewParam))
1468 TTP->removeDefaultArgument();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001469 else if (NonTypeTemplateParmDecl *NTTP
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001470 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam))
1471 NTTP->removeDefaultArgument();
1472 else
1473 cast<TemplateTemplateParmDecl>(*NewParam)->removeDefaultArgument();
1474 }
1475 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001476
Douglas Gregord684b002009-02-10 19:49:53 +00001477 return Invalid;
1478}
Douglas Gregorc15cb382009-02-09 23:23:08 +00001479
John McCall4e2cbb22010-10-20 05:44:58 +00001480namespace {
1481
1482/// A class which looks for a use of a certain level of template
1483/// parameter.
1484struct DependencyChecker : RecursiveASTVisitor<DependencyChecker> {
1485 typedef RecursiveASTVisitor<DependencyChecker> super;
1486
1487 unsigned Depth;
1488 bool Match;
1489
1490 DependencyChecker(TemplateParameterList *Params) : Match(false) {
1491 NamedDecl *ND = Params->getParam(0);
1492 if (TemplateTypeParmDecl *PD = dyn_cast<TemplateTypeParmDecl>(ND)) {
1493 Depth = PD->getDepth();
1494 } else if (NonTypeTemplateParmDecl *PD =
1495 dyn_cast<NonTypeTemplateParmDecl>(ND)) {
1496 Depth = PD->getDepth();
1497 } else {
1498 Depth = cast<TemplateTemplateParmDecl>(ND)->getDepth();
1499 }
1500 }
1501
1502 bool Matches(unsigned ParmDepth) {
1503 if (ParmDepth >= Depth) {
1504 Match = true;
1505 return true;
1506 }
1507 return false;
1508 }
1509
1510 bool VisitTemplateTypeParmType(const TemplateTypeParmType *T) {
1511 return !Matches(T->getDepth());
1512 }
1513
1514 bool TraverseTemplateName(TemplateName N) {
1515 if (TemplateTemplateParmDecl *PD =
1516 dyn_cast_or_null<TemplateTemplateParmDecl>(N.getAsTemplateDecl()))
1517 if (Matches(PD->getDepth())) return false;
1518 return super::TraverseTemplateName(N);
1519 }
1520
1521 bool VisitDeclRefExpr(DeclRefExpr *E) {
1522 if (NonTypeTemplateParmDecl *PD =
1523 dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) {
1524 if (PD->getDepth() == Depth) {
1525 Match = true;
1526 return false;
1527 }
1528 }
1529 return super::VisitDeclRefExpr(E);
1530 }
Douglas Gregor18c83392011-05-13 00:34:01 +00001531
1532 bool TraverseInjectedClassNameType(const InjectedClassNameType *T) {
1533 return TraverseType(T->getInjectedSpecializationType());
1534 }
John McCall4e2cbb22010-10-20 05:44:58 +00001535};
1536}
1537
Douglas Gregorc8406492011-05-10 18:27:06 +00001538/// Determines whether a given type depends on the given parameter
John McCall4e2cbb22010-10-20 05:44:58 +00001539/// list.
1540static bool
Douglas Gregorc8406492011-05-10 18:27:06 +00001541DependsOnTemplateParameters(QualType T, TemplateParameterList *Params) {
John McCall4e2cbb22010-10-20 05:44:58 +00001542 DependencyChecker Checker(Params);
Douglas Gregorc8406492011-05-10 18:27:06 +00001543 Checker.TraverseType(T);
John McCall4e2cbb22010-10-20 05:44:58 +00001544 return Checker.Match;
1545}
1546
Douglas Gregorc8406492011-05-10 18:27:06 +00001547// Find the source range corresponding to the named type in the given
1548// nested-name-specifier, if any.
1549static SourceRange getRangeOfTypeInNestedNameSpecifier(ASTContext &Context,
1550 QualType T,
1551 const CXXScopeSpec &SS) {
1552 NestedNameSpecifierLoc NNSLoc(SS.getScopeRep(), SS.location_data());
1553 while (NestedNameSpecifier *NNS = NNSLoc.getNestedNameSpecifier()) {
1554 if (const Type *CurType = NNS->getAsType()) {
1555 if (Context.hasSameUnqualifiedType(T, QualType(CurType, 0)))
1556 return NNSLoc.getTypeLoc().getSourceRange();
1557 } else
1558 break;
1559
1560 NNSLoc = NNSLoc.getPrefix();
1561 }
1562
1563 return SourceRange();
1564}
1565
Mike Stump1eb44332009-09-09 15:08:12 +00001566/// \brief Match the given template parameter lists to the given scope
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001567/// specifier, returning the template parameter list that applies to the
1568/// name.
1569///
1570/// \param DeclStartLoc the start of the declaration that has a scope
1571/// specifier or a template parameter list.
Mike Stump1eb44332009-09-09 15:08:12 +00001572///
Douglas Gregorc8406492011-05-10 18:27:06 +00001573/// \param DeclLoc The location of the declaration itself.
1574///
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001575/// \param SS the scope specifier that will be matched to the given template
1576/// parameter lists. This scope specifier precedes a qualified name that is
1577/// being declared.
1578///
1579/// \param ParamLists the template parameter lists, from the outermost to the
1580/// innermost template parameter lists.
1581///
John McCall77e8b112010-04-13 20:37:33 +00001582/// \param IsFriend Whether to apply the slightly different rules for
1583/// matching template parameters to scope specifiers in friend
1584/// declarations.
1585///
Douglas Gregor1fef4e62009-10-07 22:35:40 +00001586/// \param IsExplicitSpecialization will be set true if the entity being
1587/// declared is an explicit specialization, false otherwise.
1588///
Mike Stump1eb44332009-09-09 15:08:12 +00001589/// \returns the template parameter list, if any, that corresponds to the
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001590/// name that is preceded by the scope specifier @p SS. This template
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00001591/// parameter list may have template parameters (if we're declaring a
Mike Stump1eb44332009-09-09 15:08:12 +00001592/// template) or may have no template parameters (if we're declaring a
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00001593/// template specialization), or may be NULL (if what we're declaring isn't
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001594/// itself a template).
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001595TemplateParameterList *Sema::MatchTemplateParametersToScopeSpecifier(
1596 SourceLocation DeclStartLoc, SourceLocation DeclLoc, const CXXScopeSpec &SS,
1597 ArrayRef<TemplateParameterList *> ParamLists, bool IsFriend,
1598 bool &IsExplicitSpecialization, bool &Invalid) {
Douglas Gregor1fef4e62009-10-07 22:35:40 +00001599 IsExplicitSpecialization = false;
Douglas Gregorc8406492011-05-10 18:27:06 +00001600 Invalid = false;
1601
1602 // The sequence of nested types to which we will match up the template
1603 // parameter lists. We first build this list by starting with the type named
1604 // by the nested-name-specifier and walking out until we run out of types.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001605 SmallVector<QualType, 4> NestedTypes;
Douglas Gregorc8406492011-05-10 18:27:06 +00001606 QualType T;
Douglas Gregor714c9922011-05-15 17:27:27 +00001607 if (SS.getScopeRep()) {
1608 if (CXXRecordDecl *Record
1609 = dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, true)))
1610 T = Context.getTypeDeclType(Record);
1611 else
1612 T = QualType(SS.getScopeRep()->getAsType(), 0);
1613 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001614
1615 // If we found an explicit specialization that prevents us from needing
1616 // 'template<>' headers, this will be set to the location of that
1617 // explicit specialization.
1618 SourceLocation ExplicitSpecLoc;
1619
1620 while (!T.isNull()) {
1621 NestedTypes.push_back(T);
1622
1623 // Retrieve the parent of a record type.
1624 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
1625 // If this type is an explicit specialization, we're done.
1626 if (ClassTemplateSpecializationDecl *Spec
1627 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
1628 if (!isa<ClassTemplatePartialSpecializationDecl>(Spec) &&
1629 Spec->getSpecializationKind() == TSK_ExplicitSpecialization) {
1630 ExplicitSpecLoc = Spec->getLocation();
1631 break;
Douglas Gregor3ebd7532009-11-23 12:11:45 +00001632 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001633 } else if (Record->getTemplateSpecializationKind()
1634 == TSK_ExplicitSpecialization) {
1635 ExplicitSpecLoc = Record->getLocation();
John McCall77e8b112010-04-13 20:37:33 +00001636 break;
1637 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001638
1639 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Record->getParent()))
1640 T = Context.getTypeDeclType(Parent);
1641 else
1642 T = QualType();
1643 continue;
1644 }
1645
1646 if (const TemplateSpecializationType *TST
1647 = T->getAs<TemplateSpecializationType>()) {
1648 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
1649 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Template->getDeclContext()))
1650 T = Context.getTypeDeclType(Parent);
1651 else
1652 T = QualType();
1653 continue;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001654 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001655 }
1656
1657 // Look one step prior in a dependent template specialization type.
1658 if (const DependentTemplateSpecializationType *DependentTST
1659 = T->getAs<DependentTemplateSpecializationType>()) {
1660 if (NestedNameSpecifier *NNS = DependentTST->getQualifier())
1661 T = QualType(NNS->getAsType(), 0);
1662 else
1663 T = QualType();
1664 continue;
1665 }
1666
1667 // Look one step prior in a dependent name type.
1668 if (const DependentNameType *DependentName = T->getAs<DependentNameType>()){
1669 if (NestedNameSpecifier *NNS = DependentName->getQualifier())
1670 T = QualType(NNS->getAsType(), 0);
1671 else
1672 T = QualType();
1673 continue;
1674 }
1675
1676 // Retrieve the parent of an enumeration type.
1677 if (const EnumType *EnumT = T->getAs<EnumType>()) {
1678 // FIXME: Forward-declared enums require a TSK_ExplicitSpecialization
1679 // check here.
1680 EnumDecl *Enum = EnumT->getDecl();
1681
1682 // Get to the parent type.
1683 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Enum->getParent()))
1684 T = Context.getTypeDeclType(Parent);
1685 else
1686 T = QualType();
1687 continue;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001688 }
Mike Stump1eb44332009-09-09 15:08:12 +00001689
Douglas Gregorc8406492011-05-10 18:27:06 +00001690 T = QualType();
1691 }
1692 // Reverse the nested types list, since we want to traverse from the outermost
1693 // to the innermost while checking template-parameter-lists.
1694 std::reverse(NestedTypes.begin(), NestedTypes.end());
Douglas Gregorb88e8882009-07-30 17:40:51 +00001695
Douglas Gregorc8406492011-05-10 18:27:06 +00001696 // C++0x [temp.expl.spec]p17:
1697 // A member or a member template may be nested within many
1698 // enclosing class templates. In an explicit specialization for
1699 // such a member, the member declaration shall be preceded by a
1700 // template<> for each enclosing class template that is
1701 // explicitly specialized.
Douglas Gregor89b9f102011-06-06 15:22:55 +00001702 bool SawNonEmptyTemplateParameterList = false;
Douglas Gregorc8406492011-05-10 18:27:06 +00001703 unsigned ParamIdx = 0;
1704 for (unsigned TypeIdx = 0, NumTypes = NestedTypes.size(); TypeIdx != NumTypes;
1705 ++TypeIdx) {
1706 T = NestedTypes[TypeIdx];
1707
1708 // Whether we expect a 'template<>' header.
1709 bool NeedEmptyTemplateHeader = false;
1710
1711 // Whether we expect a template header with parameters.
1712 bool NeedNonemptyTemplateHeader = false;
1713
1714 // For a dependent type, the set of template parameters that we
1715 // expect to see.
1716 TemplateParameterList *ExpectedTemplateParams = 0;
1717
Douglas Gregor175c5bb2011-05-11 23:26:17 +00001718 // C++0x [temp.expl.spec]p15:
1719 // A member or a member template may be nested within many enclosing
1720 // class templates. In an explicit specialization for such a member, the
1721 // member declaration shall be preceded by a template<> for each
1722 // enclosing class template that is explicitly specialized.
Douglas Gregorc8406492011-05-10 18:27:06 +00001723 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
1724 if (ClassTemplatePartialSpecializationDecl *Partial
1725 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) {
1726 ExpectedTemplateParams = Partial->getTemplateParameters();
1727 NeedNonemptyTemplateHeader = true;
1728 } else if (Record->isDependentType()) {
1729 if (Record->getDescribedClassTemplate()) {
John McCall31f17ec2010-04-27 00:57:59 +00001730 ExpectedTemplateParams = Record->getDescribedClassTemplate()
Douglas Gregorc8406492011-05-10 18:27:06 +00001731 ->getTemplateParameters();
1732 NeedNonemptyTemplateHeader = true;
1733 }
1734 } else if (ClassTemplateSpecializationDecl *Spec
1735 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
1736 // C++0x [temp.expl.spec]p4:
1737 // Members of an explicitly specialized class template are defined
1738 // in the same manner as members of normal classes, and not using
1739 // the template<> syntax.
1740 if (Spec->getSpecializationKind() != TSK_ExplicitSpecialization)
1741 NeedEmptyTemplateHeader = true;
1742 else
Douglas Gregor95ea4502011-06-01 22:37:07 +00001743 continue;
Douglas Gregorc8406492011-05-10 18:27:06 +00001744 } else if (Record->getTemplateSpecializationKind()) {
1745 if (Record->getTemplateSpecializationKind()
Douglas Gregor175c5bb2011-05-11 23:26:17 +00001746 != TSK_ExplicitSpecialization &&
1747 TypeIdx == NumTypes - 1)
1748 IsExplicitSpecialization = true;
1749
1750 continue;
Douglas Gregorc8406492011-05-10 18:27:06 +00001751 }
1752 } else if (const TemplateSpecializationType *TST
1753 = T->getAs<TemplateSpecializationType>()) {
1754 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
1755 ExpectedTemplateParams = Template->getTemplateParameters();
1756 NeedNonemptyTemplateHeader = true;
1757 }
1758 } else if (T->getAs<DependentTemplateSpecializationType>()) {
1759 // FIXME: We actually could/should check the template arguments here
1760 // against the corresponding template parameter list.
1761 NeedNonemptyTemplateHeader = false;
1762 }
1763
Douglas Gregor89b9f102011-06-06 15:22:55 +00001764 // C++ [temp.expl.spec]p16:
1765 // In an explicit specialization declaration for a member of a class
1766 // template or a member template that ap- pears in namespace scope, the
1767 // member template and some of its enclosing class templates may remain
1768 // unspecialized, except that the declaration shall not explicitly
1769 // specialize a class member template if its en- closing class templates
1770 // are not explicitly specialized as well.
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001771 if (ParamIdx < ParamLists.size()) {
Douglas Gregor89b9f102011-06-06 15:22:55 +00001772 if (ParamLists[ParamIdx]->size() == 0) {
1773 if (SawNonEmptyTemplateParameterList) {
1774 Diag(DeclLoc, diag::err_specialize_member_of_template)
1775 << ParamLists[ParamIdx]->getSourceRange();
1776 Invalid = true;
1777 IsExplicitSpecialization = false;
1778 return 0;
1779 }
1780 } else
1781 SawNonEmptyTemplateParameterList = true;
1782 }
1783
Douglas Gregorc8406492011-05-10 18:27:06 +00001784 if (NeedEmptyTemplateHeader) {
1785 // If we're on the last of the types, and we need a 'template<>' header
1786 // here, then it's an explicit specialization.
1787 if (TypeIdx == NumTypes - 1)
1788 IsExplicitSpecialization = true;
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001789
1790 if (ParamIdx < ParamLists.size()) {
Douglas Gregorc8406492011-05-10 18:27:06 +00001791 if (ParamLists[ParamIdx]->size() > 0) {
1792 // The header has template parameters when it shouldn't. Complain.
1793 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
1794 diag::err_template_param_list_matches_nontemplate)
1795 << T
1796 << SourceRange(ParamLists[ParamIdx]->getLAngleLoc(),
1797 ParamLists[ParamIdx]->getRAngleLoc())
1798 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
1799 Invalid = true;
1800 return 0;
1801 }
1802
1803 // Consume this template header.
1804 ++ParamIdx;
1805 continue;
1806 }
1807
1808 if (!IsFriend) {
1809 // We don't have a template header, but we should.
1810 SourceLocation ExpectedTemplateLoc;
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001811 if (!ParamLists.empty())
Douglas Gregorc8406492011-05-10 18:27:06 +00001812 ExpectedTemplateLoc = ParamLists[0]->getTemplateLoc();
1813 else
1814 ExpectedTemplateLoc = DeclStartLoc;
1815
1816 Diag(DeclLoc, diag::err_template_spec_needs_header)
1817 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS)
1818 << FixItHint::CreateInsertion(ExpectedTemplateLoc, "template<> ");
1819 }
1820
1821 continue;
1822 }
1823
1824 if (NeedNonemptyTemplateHeader) {
1825 // In friend declarations we can have template-ids which don't
1826 // depend on the corresponding template parameter lists. But
1827 // assume that empty parameter lists are supposed to match this
1828 // template-id.
1829 if (IsFriend && T->isDependentType()) {
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001830 if (ParamIdx < ParamLists.size() &&
Douglas Gregorc8406492011-05-10 18:27:06 +00001831 DependsOnTemplateParameters(T, ParamLists[ParamIdx]))
1832 ExpectedTemplateParams = 0;
1833 else
1834 continue;
Mike Stump1eb44332009-09-09 15:08:12 +00001835 }
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001836
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001837 if (ParamIdx < ParamLists.size()) {
1838 // Check the template parameter list, if we can.
Douglas Gregorc8406492011-05-10 18:27:06 +00001839 if (ExpectedTemplateParams &&
1840 !TemplateParameterListsAreEqual(ParamLists[ParamIdx],
1841 ExpectedTemplateParams,
1842 true, TPL_TemplateMatch))
1843 Invalid = true;
1844
1845 if (!Invalid &&
1846 CheckTemplateParameterList(ParamLists[ParamIdx], 0,
1847 TPC_ClassTemplateMember))
1848 Invalid = true;
1849
1850 ++ParamIdx;
1851 continue;
1852 }
1853
1854 Diag(DeclLoc, diag::err_template_spec_needs_template_parameters)
1855 << T
1856 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
1857 Invalid = true;
1858 continue;
1859 }
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001860 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001861
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001862 // If there were at least as many template-ids as there were template
1863 // parameter lists, then there are no template parameter lists remaining for
1864 // the declaration itself.
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001865 if (ParamIdx >= ParamLists.size())
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001866 return 0;
Mike Stump1eb44332009-09-09 15:08:12 +00001867
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001868 // If there were too many template parameter lists, complain about that now.
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001869 if (ParamIdx < ParamLists.size() - 1) {
Douglas Gregorc8406492011-05-10 18:27:06 +00001870 bool HasAnyExplicitSpecHeader = false;
1871 bool AllExplicitSpecHeaders = true;
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001872 for (unsigned I = ParamIdx, E = ParamLists.size() - 1; I != E; ++I) {
Douglas Gregorc8406492011-05-10 18:27:06 +00001873 if (ParamLists[I]->size() == 0)
1874 HasAnyExplicitSpecHeader = true;
1875 else
1876 AllExplicitSpecHeaders = false;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001877 }
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001878
Douglas Gregorc8406492011-05-10 18:27:06 +00001879 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001880 AllExplicitSpecHeaders ? diag::warn_template_spec_extra_headers
1881 : diag::err_template_spec_extra_headers)
1882 << SourceRange(ParamLists[ParamIdx]->getTemplateLoc(),
1883 ParamLists[ParamLists.size() - 2]->getRAngleLoc());
Douglas Gregorc8406492011-05-10 18:27:06 +00001884
1885 // If there was a specialization somewhere, such that 'template<>' is
1886 // not required, and there were any 'template<>' headers, note where the
1887 // specialization occurred.
1888 if (ExplicitSpecLoc.isValid() && HasAnyExplicitSpecHeader)
1889 Diag(ExplicitSpecLoc,
1890 diag::note_explicit_template_spec_does_not_need_header)
1891 << NestedTypes.back();
1892
1893 // We have a template parameter list with no corresponding scope, which
1894 // means that the resulting template declaration can't be instantiated
1895 // properly (we'll end up with dependent nodes when we shouldn't).
1896 if (!AllExplicitSpecHeaders)
1897 Invalid = true;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001898 }
Mike Stump1eb44332009-09-09 15:08:12 +00001899
Douglas Gregor89b9f102011-06-06 15:22:55 +00001900 // C++ [temp.expl.spec]p16:
1901 // In an explicit specialization declaration for a member of a class
1902 // template or a member template that ap- pears in namespace scope, the
1903 // member template and some of its enclosing class templates may remain
1904 // unspecialized, except that the declaration shall not explicitly
1905 // specialize a class member template if its en- closing class templates
1906 // are not explicitly specialized as well.
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001907 if (ParamLists.back()->size() == 0 && SawNonEmptyTemplateParameterList) {
Douglas Gregor89b9f102011-06-06 15:22:55 +00001908 Diag(DeclLoc, diag::err_specialize_member_of_template)
1909 << ParamLists[ParamIdx]->getSourceRange();
1910 Invalid = true;
1911 IsExplicitSpecialization = false;
1912 return 0;
1913 }
1914
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001915 // Return the last template parameter list, which corresponds to the
1916 // entity being declared.
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001917 return ParamLists.back();
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001918}
1919
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001920void Sema::NoteAllFoundTemplates(TemplateName Name) {
1921 if (TemplateDecl *Template = Name.getAsTemplateDecl()) {
1922 Diag(Template->getLocation(), diag::note_template_declared_here)
Larisse Voufoef4579c2013-08-06 01:03:05 +00001923 << (isa<FunctionTemplateDecl>(Template)
1924 ? 0
1925 : isa<ClassTemplateDecl>(Template)
1926 ? 1
1927 : isa<VarTemplateDecl>(Template)
1928 ? 2
1929 : isa<TypeAliasTemplateDecl>(Template) ? 3 : 4)
1930 << Template->getDeclName();
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001931 return;
1932 }
1933
1934 if (OverloadedTemplateStorage *OST = Name.getAsOverloadedTemplate()) {
1935 for (OverloadedTemplateStorage::iterator I = OST->begin(),
1936 IEnd = OST->end();
1937 I != IEnd; ++I)
1938 Diag((*I)->getLocation(), diag::note_template_declared_here)
1939 << 0 << (*I)->getDeclName();
1940
1941 return;
1942 }
1943}
1944
Douglas Gregor7532dc62009-03-30 22:58:21 +00001945QualType Sema::CheckTemplateIdType(TemplateName Name,
1946 SourceLocation TemplateLoc,
Douglas Gregor67714232011-03-03 02:41:12 +00001947 TemplateArgumentListInfo &TemplateArgs) {
John McCall14606042011-06-30 08:33:18 +00001948 DependentTemplateName *DTN
1949 = Name.getUnderlying().getAsDependentTemplateName();
Richard Smith3e4c6c42011-05-05 21:57:07 +00001950 if (DTN && DTN->isIdentifier())
1951 // When building a template-id where the template-name is dependent,
1952 // assume the template is a type template. Either our assumption is
1953 // correct, or the code is ill-formed and will be diagnosed when the
1954 // dependent name is substituted.
1955 return Context.getDependentTemplateSpecializationType(ETK_None,
1956 DTN->getQualifier(),
1957 DTN->getIdentifier(),
1958 TemplateArgs);
1959
Douglas Gregor7532dc62009-03-30 22:58:21 +00001960 TemplateDecl *Template = Name.getAsTemplateDecl();
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001961 if (!Template || isa<FunctionTemplateDecl>(Template)) {
1962 // We might have a substituted template template parameter pack. If so,
1963 // build a template specialization type for it.
1964 if (Name.getAsSubstTemplateTemplateParmPack())
1965 return Context.getTemplateSpecializationType(Name, TemplateArgs);
Richard Smith3e4c6c42011-05-05 21:57:07 +00001966
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001967 Diag(TemplateLoc, diag::err_template_id_not_a_type)
1968 << Name;
1969 NoteAllFoundTemplates(Name);
1970 return QualType();
Douglas Gregorc45c2322009-03-31 00:43:58 +00001971 }
Douglas Gregor7532dc62009-03-30 22:58:21 +00001972
Douglas Gregor40808ce2009-03-09 23:48:35 +00001973 // Check that the template argument list is well-formed for this
1974 // template.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001975 SmallVector<TemplateArgument, 4> Converted;
Douglas Gregorb70126a2012-02-03 17:16:23 +00001976 bool ExpansionIntoFixedList = false;
John McCalld5532b62009-11-23 01:53:49 +00001977 if (CheckTemplateArgumentList(Template, TemplateLoc, TemplateArgs,
Douglas Gregorb70126a2012-02-03 17:16:23 +00001978 false, Converted, &ExpansionIntoFixedList))
Douglas Gregor40808ce2009-03-09 23:48:35 +00001979 return QualType();
1980
Douglas Gregor40808ce2009-03-09 23:48:35 +00001981 QualType CanonType;
1982
Douglas Gregor561f8122011-07-01 01:22:09 +00001983 bool InstantiationDependent = false;
Douglas Gregorb70126a2012-02-03 17:16:23 +00001984 TypeAliasTemplateDecl *AliasTemplate = 0;
1985 if (!ExpansionIntoFixedList &&
1986 (AliasTemplate = dyn_cast<TypeAliasTemplateDecl>(Template))) {
Richard Smith3e4c6c42011-05-05 21:57:07 +00001987 // Find the canonical type for this type alias template specialization.
1988 TypeAliasDecl *Pattern = AliasTemplate->getTemplatedDecl();
1989 if (Pattern->isInvalidDecl())
1990 return QualType();
1991
1992 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
1993 Converted.data(), Converted.size());
1994
1995 // Only substitute for the innermost template argument list.
1996 MultiLevelTemplateArgumentList TemplateArgLists;
Richard Smith18041742011-05-14 15:04:18 +00001997 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
Richard Smithaff37b42011-05-12 00:06:17 +00001998 unsigned Depth = AliasTemplate->getTemplateParameters()->getDepth();
1999 for (unsigned I = 0; I < Depth; ++I)
Richard Smith7a9f7c72013-05-17 03:04:50 +00002000 TemplateArgLists.addOuterTemplateArguments(None);
Richard Smith3e4c6c42011-05-05 21:57:07 +00002001
Richard Smitha8eaf002012-08-23 06:16:52 +00002002 LocalInstantiationScope Scope(*this);
Richard Smith3e4c6c42011-05-05 21:57:07 +00002003 InstantiatingTemplate Inst(*this, TemplateLoc, Template);
Richard Smithab91ef12012-07-08 02:38:24 +00002004 if (Inst)
2005 return QualType();
Richard Smitha8eaf002012-08-23 06:16:52 +00002006
Richard Smith3e4c6c42011-05-05 21:57:07 +00002007 CanonType = SubstType(Pattern->getUnderlyingType(),
2008 TemplateArgLists, AliasTemplate->getLocation(),
2009 AliasTemplate->getDeclName());
2010 if (CanonType.isNull())
2011 return QualType();
2012 } else if (Name.isDependent() ||
2013 TemplateSpecializationType::anyDependentTemplateArguments(
Douglas Gregor561f8122011-07-01 01:22:09 +00002014 TemplateArgs, InstantiationDependent)) {
Douglas Gregor40808ce2009-03-09 23:48:35 +00002015 // This class template specialization is a dependent
2016 // type. Therefore, its canonical type is another class template
2017 // specialization type that contains all of the converted
2018 // arguments in canonical form. This ensures that, e.g., A<T> and
2019 // A<T, T> have identical types when A is declared as:
2020 //
2021 // template<typename T, typename U = T> struct A;
Douglas Gregor25a3ef72009-05-07 06:41:52 +00002022 TemplateName CanonName = Context.getCanonicalTemplateName(Name);
Mike Stump1eb44332009-09-09 15:08:12 +00002023 CanonType = Context.getTemplateSpecializationType(CanonName,
Douglas Gregor910f8002010-11-07 23:05:16 +00002024 Converted.data(),
2025 Converted.size());
Mike Stump1eb44332009-09-09 15:08:12 +00002026
Douglas Gregor1275ae02009-07-28 23:00:59 +00002027 // FIXME: CanonType is not actually the canonical type, and unfortunately
John McCall833ca992009-10-29 08:12:44 +00002028 // it is a TemplateSpecializationType that we will never use again.
Douglas Gregor1275ae02009-07-28 23:00:59 +00002029 // In the future, we need to teach getTemplateSpecializationType to only
2030 // build the canonical type and return that to us.
2031 CanonType = Context.getCanonicalType(CanonType);
John McCall31f17ec2010-04-27 00:57:59 +00002032
2033 // This might work out to be a current instantiation, in which
2034 // case the canonical type needs to be the InjectedClassNameType.
2035 //
2036 // TODO: in theory this could be a simple hashtable lookup; most
2037 // changes to CurContext don't change the set of current
2038 // instantiations.
2039 if (isa<ClassTemplateDecl>(Template)) {
2040 for (DeclContext *Ctx = CurContext; Ctx; Ctx = Ctx->getLookupParent()) {
2041 // If we get out to a namespace, we're done.
2042 if (Ctx->isFileContext()) break;
2043
2044 // If this isn't a record, keep looking.
2045 CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx);
2046 if (!Record) continue;
2047
2048 // Look for one of the two cases with InjectedClassNameTypes
2049 // and check whether it's the same template.
2050 if (!isa<ClassTemplatePartialSpecializationDecl>(Record) &&
2051 !Record->getDescribedClassTemplate())
2052 continue;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002053
John McCall31f17ec2010-04-27 00:57:59 +00002054 // Fetch the injected class name type and check whether its
2055 // injected type is equal to the type we just built.
2056 QualType ICNT = Context.getTypeDeclType(Record);
2057 QualType Injected = cast<InjectedClassNameType>(ICNT)
2058 ->getInjectedSpecializationType();
2059
2060 if (CanonType != Injected->getCanonicalTypeInternal())
2061 continue;
2062
2063 // If so, the canonical type of this TST is the injected
2064 // class name type of the record we just found.
2065 assert(ICNT.isCanonical());
2066 CanonType = ICNT;
John McCall31f17ec2010-04-27 00:57:59 +00002067 break;
2068 }
2069 }
Mike Stump1eb44332009-09-09 15:08:12 +00002070 } else if (ClassTemplateDecl *ClassTemplate
Douglas Gregor7532dc62009-03-30 22:58:21 +00002071 = dyn_cast<ClassTemplateDecl>(Template)) {
Douglas Gregor40808ce2009-03-09 23:48:35 +00002072 // Find the class template specialization declaration that
2073 // corresponds to these arguments.
Douglas Gregor40808ce2009-03-09 23:48:35 +00002074 void *InsertPos = 0;
2075 ClassTemplateSpecializationDecl *Decl
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002076 = ClassTemplate->findSpecialization(Converted.data(), Converted.size(),
Douglas Gregor910f8002010-11-07 23:05:16 +00002077 InsertPos);
Douglas Gregor40808ce2009-03-09 23:48:35 +00002078 if (!Decl) {
2079 // This is the first time we have referenced this class template
2080 // specialization. Create the canonical declaration and add it to
2081 // the set of specializations.
Mike Stump1eb44332009-09-09 15:08:12 +00002082 Decl = ClassTemplateSpecializationDecl::Create(Context,
Douglas Gregor13c85772010-05-06 00:28:52 +00002083 ClassTemplate->getTemplatedDecl()->getTagKind(),
2084 ClassTemplate->getDeclContext(),
Abramo Bagnara09d82122011-10-03 20:34:03 +00002085 ClassTemplate->getTemplatedDecl()->getLocStart(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00002086 ClassTemplate->getLocation(),
Douglas Gregor910f8002010-11-07 23:05:16 +00002087 ClassTemplate,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002088 Converted.data(),
Douglas Gregor910f8002010-11-07 23:05:16 +00002089 Converted.size(), 0);
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00002090 ClassTemplate->AddSpecialization(Decl, InsertPos);
Abramo Bagnara4f216d382012-09-05 09:05:18 +00002091 if (ClassTemplate->isOutOfLine())
2092 Decl->setLexicalDeclContext(ClassTemplate->getLexicalDeclContext());
Douglas Gregor40808ce2009-03-09 23:48:35 +00002093 }
2094
2095 CanonType = Context.getTypeDeclType(Decl);
John McCall3cb0ebd2010-03-10 03:28:59 +00002096 assert(isa<RecordType>(CanonType) &&
2097 "type of non-dependent specialization is not a RecordType");
Douglas Gregor40808ce2009-03-09 23:48:35 +00002098 }
Mike Stump1eb44332009-09-09 15:08:12 +00002099
Douglas Gregor40808ce2009-03-09 23:48:35 +00002100 // Build the fully-sugared type for this class template
2101 // specialization, which refers back to the class template
2102 // specialization we created or found.
John McCall71d74bc2010-06-13 09:25:03 +00002103 return Context.getTemplateSpecializationType(Name, TemplateArgs, CanonType);
Douglas Gregor40808ce2009-03-09 23:48:35 +00002104}
2105
John McCallf312b1e2010-08-26 23:41:50 +00002106TypeResult
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002107Sema::ActOnTemplateIdType(CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
Douglas Gregor059101f2011-03-02 00:47:37 +00002108 TemplateTy TemplateD, SourceLocation TemplateLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00002109 SourceLocation LAngleLoc,
Douglas Gregor7532dc62009-03-30 22:58:21 +00002110 ASTTemplateArgsPtr TemplateArgsIn,
Abramo Bagnarafad03b72012-01-27 08:46:19 +00002111 SourceLocation RAngleLoc,
2112 bool IsCtorOrDtorName) {
Douglas Gregor059101f2011-03-02 00:47:37 +00002113 if (SS.isInvalid())
2114 return true;
2115
Serge Pavlov18062392013-08-27 13:15:56 +00002116 TemplateName Template = TemplateD.get();
Douglas Gregor55f6b142009-02-09 18:46:07 +00002117
Douglas Gregor40808ce2009-03-09 23:48:35 +00002118 // Translate the parser's template argument list in our AST format.
John McCalld5532b62009-11-23 01:53:49 +00002119 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
Douglas Gregor314b97f2009-11-10 19:49:08 +00002120 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
Douglas Gregorc15cb382009-02-09 23:23:08 +00002121
Douglas Gregora88f09f2011-02-28 17:23:35 +00002122 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
Abramo Bagnarafad03b72012-01-27 08:46:19 +00002123 QualType T
2124 = Context.getDependentTemplateSpecializationType(ETK_None,
2125 DTN->getQualifier(),
2126 DTN->getIdentifier(),
2127 TemplateArgs);
2128 // Build type-source information.
Douglas Gregora88f09f2011-02-28 17:23:35 +00002129 TypeLocBuilder TLB;
2130 DependentTemplateSpecializationTypeLoc SpecTL
2131 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002132 SpecTL.setElaboratedKeywordLoc(SourceLocation());
2133 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
Abramo Bagnara66581d42012-02-06 22:45:07 +00002134 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002135 SpecTL.setTemplateNameLoc(TemplateLoc);
Douglas Gregora88f09f2011-02-28 17:23:35 +00002136 SpecTL.setLAngleLoc(LAngleLoc);
2137 SpecTL.setRAngleLoc(RAngleLoc);
Douglas Gregora88f09f2011-02-28 17:23:35 +00002138 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
2139 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
2140 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
2141 }
2142
John McCalld5532b62009-11-23 01:53:49 +00002143 QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs);
Douglas Gregor31a19b62009-04-01 21:51:26 +00002144
2145 if (Result.isNull())
2146 return true;
2147
Douglas Gregor059101f2011-03-02 00:47:37 +00002148 // Build type-source information.
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002149 TypeLocBuilder TLB;
Douglas Gregor059101f2011-03-02 00:47:37 +00002150 TemplateSpecializationTypeLoc SpecTL
2151 = TLB.push<TemplateSpecializationTypeLoc>(Result);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002152 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00002153 SpecTL.setTemplateNameLoc(TemplateLoc);
2154 SpecTL.setLAngleLoc(LAngleLoc);
2155 SpecTL.setRAngleLoc(RAngleLoc);
2156 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
2157 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
John McCall833ca992009-10-29 08:12:44 +00002158
Abramo Bagnarafad03b72012-01-27 08:46:19 +00002159 // NOTE: avoid constructing an ElaboratedTypeLoc if this is a
2160 // constructor or destructor name (in such a case, the scope specifier
2161 // will be attached to the enclosing Decl or Expr node).
2162 if (SS.isNotEmpty() && !IsCtorOrDtorName) {
Douglas Gregor059101f2011-03-02 00:47:37 +00002163 // Create an elaborated-type-specifier containing the nested-name-specifier.
2164 Result = Context.getElaboratedType(ETK_None, SS.getScopeRep(), Result);
2165 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
Abramo Bagnara38a42912012-02-06 19:09:27 +00002166 ElabTL.setElaboratedKeywordLoc(SourceLocation());
Douglas Gregor059101f2011-03-02 00:47:37 +00002167 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
2168 }
2169
2170 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
John McCall6b2becf2009-09-08 17:47:29 +00002171}
John McCallf1bbbb42009-09-04 01:14:41 +00002172
Douglas Gregor059101f2011-03-02 00:47:37 +00002173TypeResult Sema::ActOnTagTemplateIdType(TagUseKind TUK,
John McCallf312b1e2010-08-26 23:41:50 +00002174 TypeSpecifierType TagSpec,
Douglas Gregor059101f2011-03-02 00:47:37 +00002175 SourceLocation TagLoc,
2176 CXXScopeSpec &SS,
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002177 SourceLocation TemplateKWLoc,
2178 TemplateTy TemplateD,
Douglas Gregor059101f2011-03-02 00:47:37 +00002179 SourceLocation TemplateLoc,
2180 SourceLocation LAngleLoc,
2181 ASTTemplateArgsPtr TemplateArgsIn,
2182 SourceLocation RAngleLoc) {
Serge Pavlov18062392013-08-27 13:15:56 +00002183 TemplateName Template = TemplateD.get();
Douglas Gregor059101f2011-03-02 00:47:37 +00002184
2185 // Translate the parser's template argument list in our AST format.
2186 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
2187 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
2188
2189 // Determine the tag kind
Abramo Bagnara465d41b2010-05-11 21:36:43 +00002190 TagTypeKind TagKind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
Douglas Gregor059101f2011-03-02 00:47:37 +00002191 ElaboratedTypeKeyword Keyword
2192 = TypeWithKeyword::getKeywordForTagTypeKind(TagKind);
Mike Stump1eb44332009-09-09 15:08:12 +00002193
Douglas Gregor059101f2011-03-02 00:47:37 +00002194 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
2195 QualType T = Context.getDependentTemplateSpecializationType(Keyword,
2196 DTN->getQualifier(),
2197 DTN->getIdentifier(),
2198 TemplateArgs);
2199
2200 // Build type-source information.
2201 TypeLocBuilder TLB;
2202 DependentTemplateSpecializationTypeLoc SpecTL
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002203 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
2204 SpecTL.setElaboratedKeywordLoc(TagLoc);
2205 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
Abramo Bagnara66581d42012-02-06 22:45:07 +00002206 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002207 SpecTL.setTemplateNameLoc(TemplateLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00002208 SpecTL.setLAngleLoc(LAngleLoc);
2209 SpecTL.setRAngleLoc(RAngleLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00002210 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
2211 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
2212 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
2213 }
Richard Smith3e4c6c42011-05-05 21:57:07 +00002214
2215 if (TypeAliasTemplateDecl *TAT =
2216 dyn_cast_or_null<TypeAliasTemplateDecl>(Template.getAsTemplateDecl())) {
2217 // C++0x [dcl.type.elab]p2:
2218 // If the identifier resolves to a typedef-name or the simple-template-id
2219 // resolves to an alias template specialization, the
2220 // elaborated-type-specifier is ill-formed.
2221 Diag(TemplateLoc, diag::err_tag_reference_non_tag) << 4;
2222 Diag(TAT->getLocation(), diag::note_declared_at);
2223 }
Douglas Gregor059101f2011-03-02 00:47:37 +00002224
2225 QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs);
2226 if (Result.isNull())
Matt Beaumont-Gay3a51d412011-08-25 23:22:24 +00002227 return TypeResult(true);
Douglas Gregor059101f2011-03-02 00:47:37 +00002228
2229 // Check the tag kind
2230 if (const RecordType *RT = Result->getAs<RecordType>()) {
John McCall6b2becf2009-09-08 17:47:29 +00002231 RecordDecl *D = RT->getDecl();
Douglas Gregor059101f2011-03-02 00:47:37 +00002232
John McCall6b2becf2009-09-08 17:47:29 +00002233 IdentifierInfo *Id = D->getIdentifier();
2234 assert(Id && "templated class must have an identifier");
Douglas Gregor059101f2011-03-02 00:47:37 +00002235
Richard Trieubbf34c02011-06-10 03:11:26 +00002236 if (!isAcceptableTagRedeclaration(D, TagKind, TUK == TUK_Definition,
2237 TagLoc, *Id)) {
John McCall6b2becf2009-09-08 17:47:29 +00002238 Diag(TagLoc, diag::err_use_with_wrong_tag)
Douglas Gregor059101f2011-03-02 00:47:37 +00002239 << Result
Douglas Gregor849b2432010-03-31 17:46:05 +00002240 << FixItHint::CreateReplacement(SourceRange(TagLoc), D->getKindName());
John McCallc4e70192009-09-11 04:59:25 +00002241 Diag(D->getLocation(), diag::note_previous_use);
John McCallf1bbbb42009-09-04 01:14:41 +00002242 }
2243 }
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002244
Douglas Gregor059101f2011-03-02 00:47:37 +00002245 // Provide source-location information for the template specialization.
2246 TypeLocBuilder TLB;
2247 TemplateSpecializationTypeLoc SpecTL
2248 = TLB.push<TemplateSpecializationTypeLoc>(Result);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002249 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00002250 SpecTL.setTemplateNameLoc(TemplateLoc);
2251 SpecTL.setLAngleLoc(LAngleLoc);
2252 SpecTL.setRAngleLoc(RAngleLoc);
2253 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
2254 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
John McCallf1bbbb42009-09-04 01:14:41 +00002255
Douglas Gregor059101f2011-03-02 00:47:37 +00002256 // Construct an elaborated type containing the nested-name-specifier (if any)
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002257 // and tag keyword.
Douglas Gregor059101f2011-03-02 00:47:37 +00002258 Result = Context.getElaboratedType(Keyword, SS.getScopeRep(), Result);
2259 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
Abramo Bagnara38a42912012-02-06 19:09:27 +00002260 ElabTL.setElaboratedKeywordLoc(TagLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00002261 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
2262 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
Douglas Gregor55f6b142009-02-09 18:46:07 +00002263}
2264
Larisse Voufoef4579c2013-08-06 01:03:05 +00002265static bool CheckTemplatePartialSpecializationArgs(
2266 Sema &S, TemplateParameterList *TemplateParams,
2267 SmallVectorImpl<TemplateArgument> &TemplateArgs);
2268
2269static bool CheckTemplateSpecializationScope(Sema &S, NamedDecl *Specialized,
2270 NamedDecl *PrevDecl,
2271 SourceLocation Loc,
2272 bool IsPartialSpecialization);
2273
2274static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D);
Larisse Voufoef4579c2013-08-06 01:03:05 +00002275
Richard Smithecbce692013-09-24 04:49:23 +00002276static bool isTemplateArgumentTemplateParameter(
2277 const TemplateArgument &Arg, unsigned Depth, unsigned Index) {
2278 switch (Arg.getKind()) {
2279 case TemplateArgument::Null:
2280 case TemplateArgument::NullPtr:
2281 case TemplateArgument::Integral:
2282 case TemplateArgument::Declaration:
2283 case TemplateArgument::Pack:
2284 case TemplateArgument::TemplateExpansion:
2285 return false;
2286
2287 case TemplateArgument::Type: {
2288 QualType Type = Arg.getAsType();
2289 const TemplateTypeParmType *TPT =
2290 Arg.getAsType()->getAs<TemplateTypeParmType>();
2291 return TPT && !Type.hasQualifiers() &&
2292 TPT->getDepth() == Depth && TPT->getIndex() == Index;
2293 }
2294
2295 case TemplateArgument::Expression: {
2296 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg.getAsExpr());
2297 if (!DRE || !DRE->getDecl())
2298 return false;
2299 const NonTypeTemplateParmDecl *NTTP =
2300 dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl());
2301 return NTTP && NTTP->getDepth() == Depth && NTTP->getIndex() == Index;
2302 }
2303
2304 case TemplateArgument::Template:
2305 const TemplateTemplateParmDecl *TTP =
2306 dyn_cast_or_null<TemplateTemplateParmDecl>(
2307 Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl());
2308 return TTP && TTP->getDepth() == Depth && TTP->getIndex() == Index;
2309 }
2310 llvm_unreachable("unexpected kind of template argument");
2311}
2312
2313static bool isSameAsPrimaryTemplate(TemplateParameterList *Params,
2314 ArrayRef<TemplateArgument> Args) {
2315 if (Params->size() != Args.size())
2316 return false;
2317
2318 unsigned Depth = Params->getDepth();
2319
2320 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
2321 TemplateArgument Arg = Args[I];
2322
2323 // If the parameter is a pack expansion, the argument must be a pack
2324 // whose only element is a pack expansion.
2325 if (Params->getParam(I)->isParameterPack()) {
2326 if (Arg.getKind() != TemplateArgument::Pack || Arg.pack_size() != 1 ||
2327 !Arg.pack_begin()->isPackExpansion())
2328 return false;
2329 Arg = Arg.pack_begin()->getPackExpansionPattern();
2330 }
2331
2332 if (!isTemplateArgumentTemplateParameter(Arg, Depth, I))
2333 return false;
2334 }
2335
2336 return true;
2337}
2338
Larisse Voufoef4579c2013-08-06 01:03:05 +00002339DeclResult Sema::ActOnVarTemplateSpecialization(
2340 Scope *S, VarTemplateDecl *VarTemplate, Declarator &D, TypeSourceInfo *DI,
2341 SourceLocation TemplateKWLoc, TemplateParameterList *TemplateParams,
2342 VarDecl::StorageClass SC, bool IsPartialSpecialization) {
2343 assert(VarTemplate && "A variable template id without template?");
2344
2345 // D must be variable template id.
2346 assert(D.getName().getKind() == UnqualifiedId::IK_TemplateId &&
2347 "Variable template specialization is declared with a template it.");
2348
2349 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
2350 SourceLocation TemplateNameLoc = D.getIdentifierLoc();
2351 SourceLocation LAngleLoc = TemplateId->LAngleLoc;
2352 SourceLocation RAngleLoc = TemplateId->RAngleLoc;
2353 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
2354 TemplateId->NumArgs);
2355 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
2356 translateTemplateArguments(TemplateArgsPtr, TemplateArgs);
2357 TemplateName Name(VarTemplate);
2358
2359 // Check for unexpanded parameter packs in any of the template arguments.
2360 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
2361 if (DiagnoseUnexpandedParameterPack(TemplateArgs[I],
2362 UPPC_PartialSpecialization))
2363 return true;
2364
2365 // Check that the template argument list is well-formed for this
2366 // template.
2367 SmallVector<TemplateArgument, 4> Converted;
2368 if (CheckTemplateArgumentList(VarTemplate, TemplateNameLoc, TemplateArgs,
2369 false, Converted))
2370 return true;
2371
2372 // Check that the type of this variable template specialization
2373 // matches the expected type.
2374 TypeSourceInfo *ExpectedDI;
2375 {
2376 // Do substitution on the type of the declaration
2377 TemplateArgumentList TemplateArgList(TemplateArgumentList::OnStack,
2378 Converted.data(), Converted.size());
2379 InstantiatingTemplate Inst(*this, TemplateKWLoc, VarTemplate);
2380 if (Inst)
2381 return true;
2382 VarDecl *Templated = VarTemplate->getTemplatedDecl();
2383 ExpectedDI =
2384 SubstType(Templated->getTypeSourceInfo(),
2385 MultiLevelTemplateArgumentList(TemplateArgList),
2386 Templated->getTypeSpecStartLoc(), Templated->getDeclName());
2387 }
2388 if (!ExpectedDI)
2389 return true;
2390
Larisse Voufoef4579c2013-08-06 01:03:05 +00002391 // Find the variable template (partial) specialization declaration that
2392 // corresponds to these arguments.
2393 if (IsPartialSpecialization) {
2394 if (CheckTemplatePartialSpecializationArgs(
2395 *this, VarTemplate->getTemplateParameters(), Converted))
2396 return true;
2397
2398 bool InstantiationDependent;
2399 if (!Name.isDependent() &&
2400 !TemplateSpecializationType::anyDependentTemplateArguments(
2401 TemplateArgs.getArgumentArray(), TemplateArgs.size(),
2402 InstantiationDependent)) {
2403 Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized)
2404 << VarTemplate->getDeclName();
2405 IsPartialSpecialization = false;
2406 }
Richard Smithecbce692013-09-24 04:49:23 +00002407
2408 if (isSameAsPrimaryTemplate(VarTemplate->getTemplateParameters(),
2409 Converted)) {
2410 // C++ [temp.class.spec]p9b3:
2411 //
2412 // -- The argument list of the specialization shall not be identical
2413 // to the implicit argument list of the primary template.
2414 Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template)
2415 << /*variable template*/ 1
2416 << /*is definition*/(SC != SC_Extern && !CurContext->isRecord())
2417 << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc));
2418 // FIXME: Recover from this by treating the declaration as a redeclaration
2419 // of the primary template.
2420 return true;
2421 }
Larisse Voufoef4579c2013-08-06 01:03:05 +00002422 }
2423
2424 void *InsertPos = 0;
2425 VarTemplateSpecializationDecl *PrevDecl = 0;
2426
2427 if (IsPartialSpecialization)
2428 // FIXME: Template parameter list matters too
2429 PrevDecl = VarTemplate->findPartialSpecialization(
2430 Converted.data(), Converted.size(), InsertPos);
2431 else
2432 PrevDecl = VarTemplate->findSpecialization(Converted.data(),
2433 Converted.size(), InsertPos);
2434
2435 VarTemplateSpecializationDecl *Specialization = 0;
2436
2437 // Check whether we can declare a variable template specialization in
2438 // the current scope.
2439 if (CheckTemplateSpecializationScope(*this, VarTemplate, PrevDecl,
2440 TemplateNameLoc,
2441 IsPartialSpecialization))
2442 return true;
2443
2444 if (PrevDecl && PrevDecl->getSpecializationKind() == TSK_Undeclared) {
2445 // Since the only prior variable template specialization with these
2446 // arguments was referenced but not declared, reuse that
2447 // declaration node as our own, updating its source location and
2448 // the list of outer template parameters to reflect our new declaration.
2449 Specialization = PrevDecl;
2450 Specialization->setLocation(TemplateNameLoc);
2451 PrevDecl = 0;
2452 } else if (IsPartialSpecialization) {
2453 // Create a new class template partial specialization declaration node.
2454 VarTemplatePartialSpecializationDecl *PrevPartial =
2455 cast_or_null<VarTemplatePartialSpecializationDecl>(PrevDecl);
Larisse Voufoef4579c2013-08-06 01:03:05 +00002456 VarTemplatePartialSpecializationDecl *Partial =
2457 VarTemplatePartialSpecializationDecl::Create(
2458 Context, VarTemplate->getDeclContext(), TemplateKWLoc,
2459 TemplateNameLoc, TemplateParams, VarTemplate, DI->getType(), DI, SC,
Richard Smith37fd27d2013-08-22 23:27:37 +00002460 Converted.data(), Converted.size(), TemplateArgs);
Larisse Voufoef4579c2013-08-06 01:03:05 +00002461
2462 if (!PrevPartial)
2463 VarTemplate->AddPartialSpecialization(Partial, InsertPos);
2464 Specialization = Partial;
2465
2466 // If we are providing an explicit specialization of a member variable
2467 // template specialization, make a note of that.
2468 if (PrevPartial && PrevPartial->getInstantiatedFromMember())
Larisse Voufo04592e72013-08-22 00:28:27 +00002469 PrevPartial->setMemberSpecialization();
Larisse Voufoef4579c2013-08-06 01:03:05 +00002470
2471 // Check that all of the template parameters of the variable template
2472 // partial specialization are deducible from the template
2473 // arguments. If not, this variable template partial specialization
2474 // will never be used.
2475 llvm::SmallBitVector DeducibleParams(TemplateParams->size());
2476 MarkUsedTemplateParameters(Partial->getTemplateArgs(), true,
2477 TemplateParams->getDepth(), DeducibleParams);
2478
2479 if (!DeducibleParams.all()) {
2480 unsigned NumNonDeducible =
2481 DeducibleParams.size() - DeducibleParams.count();
2482 Diag(TemplateNameLoc, diag::warn_partial_specs_not_deducible)
Richard Smithecbce692013-09-24 04:49:23 +00002483 << /*variable template*/ 1 << (NumNonDeducible > 1)
2484 << SourceRange(TemplateNameLoc, RAngleLoc);
Larisse Voufoef4579c2013-08-06 01:03:05 +00002485 for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) {
2486 if (!DeducibleParams[I]) {
2487 NamedDecl *Param = cast<NamedDecl>(TemplateParams->getParam(I));
2488 if (Param->getDeclName())
2489 Diag(Param->getLocation(), diag::note_partial_spec_unused_parameter)
2490 << Param->getDeclName();
2491 else
2492 Diag(Param->getLocation(), diag::note_partial_spec_unused_parameter)
2493 << "<anonymous>";
2494 }
2495 }
2496 }
2497 } else {
2498 // Create a new class template specialization declaration node for
2499 // this explicit specialization or friend declaration.
2500 Specialization = VarTemplateSpecializationDecl::Create(
2501 Context, VarTemplate->getDeclContext(), TemplateKWLoc, TemplateNameLoc,
2502 VarTemplate, DI->getType(), DI, SC, Converted.data(), Converted.size());
2503 Specialization->setTemplateArgsInfo(TemplateArgs);
2504
2505 if (!PrevDecl)
2506 VarTemplate->AddSpecialization(Specialization, InsertPos);
2507 }
2508
2509 // C++ [temp.expl.spec]p6:
2510 // If a template, a member template or the member of a class template is
2511 // explicitly specialized then that specialization shall be declared
2512 // before the first use of that specialization that would cause an implicit
2513 // instantiation to take place, in every translation unit in which such a
2514 // use occurs; no diagnostic is required.
2515 if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) {
2516 bool Okay = false;
2517 for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) {
2518 // Is there any previous explicit specialization declaration?
2519 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) {
2520 Okay = true;
2521 break;
2522 }
2523 }
2524
2525 if (!Okay) {
2526 SourceRange Range(TemplateNameLoc, RAngleLoc);
2527 Diag(TemplateNameLoc, diag::err_specialization_after_instantiation)
2528 << Name << Range;
2529
2530 Diag(PrevDecl->getPointOfInstantiation(),
2531 diag::note_instantiation_required_here)
2532 << (PrevDecl->getTemplateSpecializationKind() !=
2533 TSK_ImplicitInstantiation);
2534 return true;
2535 }
2536 }
2537
2538 Specialization->setTemplateKeywordLoc(TemplateKWLoc);
2539 Specialization->setLexicalDeclContext(CurContext);
2540
2541 // Add the specialization into its lexical context, so that it can
2542 // be seen when iterating through the list of declarations in that
2543 // context. However, specializations are not found by name lookup.
2544 CurContext->addDecl(Specialization);
2545
2546 // Note that this is an explicit specialization.
2547 Specialization->setSpecializationKind(TSK_ExplicitSpecialization);
2548
2549 if (PrevDecl) {
2550 // Check that this isn't a redefinition of this specialization,
2551 // merging with previous declarations.
2552 LookupResult PrevSpec(*this, GetNameForDeclarator(D), LookupOrdinaryName,
2553 ForRedeclaration);
2554 PrevSpec.addDecl(PrevDecl);
2555 D.setRedeclaration(CheckVariableDeclaration(Specialization, PrevSpec));
Larisse Voufo04592e72013-08-22 00:28:27 +00002556 } else if (Specialization->isStaticDataMember() &&
2557 Specialization->isOutOfLine()) {
2558 Specialization->setAccess(VarTemplate->getAccess());
Larisse Voufoef4579c2013-08-06 01:03:05 +00002559 }
2560
2561 // Link instantiations of static data members back to the template from
2562 // which they were instantiated.
2563 if (Specialization->isStaticDataMember())
2564 Specialization->setInstantiationOfStaticDataMember(
2565 VarTemplate->getTemplatedDecl(),
2566 Specialization->getSpecializationKind());
2567
2568 return Specialization;
2569}
2570
2571namespace {
2572/// \brief A partial specialization whose template arguments have matched
2573/// a given template-id.
2574struct PartialSpecMatchResult {
2575 VarTemplatePartialSpecializationDecl *Partial;
2576 TemplateArgumentList *Args;
2577};
2578}
2579
2580DeclResult
2581Sema::CheckVarTemplateId(VarTemplateDecl *Template, SourceLocation TemplateLoc,
2582 SourceLocation TemplateNameLoc,
2583 const TemplateArgumentListInfo &TemplateArgs) {
2584 assert(Template && "A variable template id without template?");
2585
2586 // Check that the template argument list is well-formed for this template.
2587 SmallVector<TemplateArgument, 4> Converted;
2588 bool ExpansionIntoFixedList = false;
2589 if (CheckTemplateArgumentList(
2590 Template, TemplateNameLoc,
2591 const_cast<TemplateArgumentListInfo &>(TemplateArgs), false,
2592 Converted, &ExpansionIntoFixedList))
2593 return true;
2594
2595 // Find the variable template specialization declaration that
2596 // corresponds to these arguments.
2597 void *InsertPos = 0;
2598 if (VarTemplateSpecializationDecl *Spec = Template->findSpecialization(
2599 Converted.data(), Converted.size(), InsertPos))
2600 // If we already have a variable template specialization, return it.
2601 return Spec;
2602
2603 // This is the first time we have referenced this variable template
2604 // specialization. Create the canonical declaration and add it to
2605 // the set of specializations, based on the closest partial specialization
2606 // that it represents. That is,
2607 VarDecl *InstantiationPattern = Template->getTemplatedDecl();
2608 TemplateArgumentList TemplateArgList(TemplateArgumentList::OnStack,
2609 Converted.data(), Converted.size());
2610 TemplateArgumentList *InstantiationArgs = &TemplateArgList;
2611 bool AmbiguousPartialSpec = false;
2612 typedef PartialSpecMatchResult MatchResult;
2613 SmallVector<MatchResult, 4> Matched;
2614 SourceLocation PointOfInstantiation = TemplateNameLoc;
2615 TemplateSpecCandidateSet FailedCandidates(PointOfInstantiation);
2616
2617 // 1. Attempt to find the closest partial specialization that this
2618 // specializes, if any.
2619 // If any of the template arguments is dependent, then this is probably
2620 // a placeholder for an incomplete declarative context; which must be
2621 // complete by instantiation time. Thus, do not search through the partial
2622 // specializations yet.
Larisse Voufo8d2a5ea2013-08-23 22:21:36 +00002623 // TODO: Unify with InstantiateClassTemplateSpecialization()?
2624 // Perhaps better after unification of DeduceTemplateArguments() and
2625 // getMoreSpecializedPartialSpecialization().
Larisse Voufoef4579c2013-08-06 01:03:05 +00002626 bool InstantiationDependent = false;
2627 if (!TemplateSpecializationType::anyDependentTemplateArguments(
2628 TemplateArgs, InstantiationDependent)) {
2629
2630 SmallVector<VarTemplatePartialSpecializationDecl *, 4> PartialSpecs;
2631 Template->getPartialSpecializations(PartialSpecs);
2632
2633 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) {
2634 VarTemplatePartialSpecializationDecl *Partial = PartialSpecs[I];
2635 TemplateDeductionInfo Info(FailedCandidates.getLocation());
2636
2637 if (TemplateDeductionResult Result =
2638 DeduceTemplateArguments(Partial, TemplateArgList, Info)) {
2639 // Store the failed-deduction information for use in diagnostics, later.
Larisse Voufo8d2a5ea2013-08-23 22:21:36 +00002640 // TODO: Actually use the failed-deduction info?
Larisse Voufoef4579c2013-08-06 01:03:05 +00002641 FailedCandidates.addCandidate()
2642 .set(Partial, MakeDeductionFailureInfo(Context, Result, Info));
2643 (void)Result;
2644 } else {
2645 Matched.push_back(PartialSpecMatchResult());
2646 Matched.back().Partial = Partial;
2647 Matched.back().Args = Info.take();
2648 }
2649 }
2650
2651 // If we're dealing with a member template where the template parameters
2652 // have been instantiated, this provides the original template parameters
2653 // from which the member template's parameters were instantiated.
2654 SmallVector<const NamedDecl *, 4> InstantiatedTemplateParameters;
2655
2656 if (Matched.size() >= 1) {
2657 SmallVector<MatchResult, 4>::iterator Best = Matched.begin();
2658 if (Matched.size() == 1) {
2659 // -- If exactly one matching specialization is found, the
2660 // instantiation is generated from that specialization.
2661 // We don't need to do anything for this.
2662 } else {
2663 // -- If more than one matching specialization is found, the
2664 // partial order rules (14.5.4.2) are used to determine
2665 // whether one of the specializations is more specialized
2666 // than the others. If none of the specializations is more
2667 // specialized than all of the other matching
2668 // specializations, then the use of the variable template is
2669 // ambiguous and the program is ill-formed.
2670 for (SmallVector<MatchResult, 4>::iterator P = Best + 1,
2671 PEnd = Matched.end();
2672 P != PEnd; ++P) {
2673 if (getMoreSpecializedPartialSpecialization(P->Partial, Best->Partial,
2674 PointOfInstantiation) ==
2675 P->Partial)
2676 Best = P;
2677 }
2678
2679 // Determine if the best partial specialization is more specialized than
2680 // the others.
2681 for (SmallVector<MatchResult, 4>::iterator P = Matched.begin(),
2682 PEnd = Matched.end();
2683 P != PEnd; ++P) {
2684 if (P != Best && getMoreSpecializedPartialSpecialization(
2685 P->Partial, Best->Partial,
2686 PointOfInstantiation) != Best->Partial) {
2687 AmbiguousPartialSpec = true;
2688 break;
2689 }
2690 }
2691 }
2692
2693 // Instantiate using the best variable template partial specialization.
2694 InstantiationPattern = Best->Partial;
2695 InstantiationArgs = Best->Args;
2696 } else {
2697 // -- If no match is found, the instantiation is generated
2698 // from the primary template.
2699 // InstantiationPattern = Template->getTemplatedDecl();
2700 }
2701 }
2702
Larisse Voufoef4579c2013-08-06 01:03:05 +00002703 // 2. Create the canonical declaration.
2704 // Note that we do not instantiate the variable just yet, since
2705 // instantiation is handled in DoMarkVarDeclReferenced().
2706 // FIXME: LateAttrs et al.?
2707 VarTemplateSpecializationDecl *Decl = BuildVarTemplateInstantiation(
2708 Template, InstantiationPattern, *InstantiationArgs, TemplateArgs,
2709 Converted, TemplateNameLoc, InsertPos /*, LateAttrs, StartingScope*/);
2710 if (!Decl)
2711 return true;
2712
2713 if (AmbiguousPartialSpec) {
2714 // Partial ordering did not produce a clear winner. Complain.
2715 Decl->setInvalidDecl();
2716 Diag(PointOfInstantiation, diag::err_partial_spec_ordering_ambiguous)
2717 << Decl;
2718
2719 // Print the matching partial specializations.
2720 for (SmallVector<MatchResult, 4>::iterator P = Matched.begin(),
2721 PEnd = Matched.end();
2722 P != PEnd; ++P)
2723 Diag(P->Partial->getLocation(), diag::note_partial_spec_match)
2724 << getTemplateArgumentBindingsText(
2725 P->Partial->getTemplateParameters(), *P->Args);
2726 return true;
2727 }
2728
2729 if (VarTemplatePartialSpecializationDecl *D =
2730 dyn_cast<VarTemplatePartialSpecializationDecl>(InstantiationPattern))
2731 Decl->setInstantiationOf(D, InstantiationArgs);
2732
2733 assert(Decl && "No variable template specialization?");
2734 return Decl;
2735}
2736
2737ExprResult
2738Sema::CheckVarTemplateId(const CXXScopeSpec &SS,
2739 const DeclarationNameInfo &NameInfo,
2740 VarTemplateDecl *Template, SourceLocation TemplateLoc,
2741 const TemplateArgumentListInfo *TemplateArgs) {
2742
2743 DeclResult Decl = CheckVarTemplateId(Template, TemplateLoc, NameInfo.getLoc(),
2744 *TemplateArgs);
2745 if (Decl.isInvalid())
2746 return ExprError();
2747
2748 VarDecl *Var = cast<VarDecl>(Decl.get());
2749 if (!Var->getTemplateSpecializationKind())
2750 Var->setTemplateSpecializationKind(TSK_ImplicitInstantiation,
2751 NameInfo.getLoc());
2752
2753 // Build an ordinary singleton decl ref.
2754 return BuildDeclarationNameExpr(SS, NameInfo, Var,
2755 /*FoundD=*/0, TemplateArgs);
2756}
2757
John McCall60d7b3a2010-08-24 06:29:42 +00002758ExprResult Sema::BuildTemplateIdExpr(const CXXScopeSpec &SS,
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002759 SourceLocation TemplateKWLoc,
Douglas Gregor4c9be892011-02-28 20:01:57 +00002760 LookupResult &R,
2761 bool RequiresADL,
Abramo Bagnara9d9922a2012-02-06 14:31:00 +00002762 const TemplateArgumentListInfo *TemplateArgs) {
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002763 // FIXME: Can we do any checking at this point? I guess we could check the
2764 // template arguments that we have against the template name, if the template
Mike Stump1eb44332009-09-09 15:08:12 +00002765 // name refers to a single template. That's not a terribly common case,
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002766 // though.
Douglas Gregor1be8eec2011-02-19 21:32:49 +00002767 // foo<int> could identify a single function unambiguously
2768 // This approach does NOT work, since f<int>(1);
2769 // gets resolved prior to resorting to overload resolution
2770 // i.e., template<class T> void f(double);
2771 // vs template<class T, class U> void f(U);
John McCallf7a1a742009-11-24 19:00:30 +00002772
2773 // These should be filtered out by our callers.
2774 assert(!R.empty() && "empty lookup results when building templateid");
2775 assert(!R.isAmbiguous() && "ambiguous lookup when building templateid");
2776
Larisse Voufoef4579c2013-08-06 01:03:05 +00002777 // In C++1y, check variable template ids.
2778 if (R.getAsSingle<VarTemplateDecl>()) {
2779 return Owned(CheckVarTemplateId(SS, R.getLookupNameInfo(),
2780 R.getAsSingle<VarTemplateDecl>(),
2781 TemplateKWLoc, TemplateArgs));
2782 }
2783
John McCallc373d482010-01-27 01:50:18 +00002784 // We don't want lookup warnings at this point.
2785 R.suppressDiagnostics();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002786
John McCallf7a1a742009-11-24 19:00:30 +00002787 UnresolvedLookupExpr *ULE
Douglas Gregorbebbe0d2010-12-15 01:34:56 +00002788 = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
Douglas Gregor4c9be892011-02-28 20:01:57 +00002789 SS.getWithLocInContext(Context),
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002790 TemplateKWLoc,
Abramo Bagnara25777432010-08-11 22:01:17 +00002791 R.getLookupNameInfo(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002792 RequiresADL, TemplateArgs,
Douglas Gregor5a84dec2010-05-23 18:57:34 +00002793 R.begin(), R.end());
John McCallf7a1a742009-11-24 19:00:30 +00002794
2795 return Owned(ULE);
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002796}
2797
John McCallf7a1a742009-11-24 19:00:30 +00002798// We actually only call this from template instantiation.
John McCall60d7b3a2010-08-24 06:29:42 +00002799ExprResult
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00002800Sema::BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS,
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002801 SourceLocation TemplateKWLoc,
Abramo Bagnara25777432010-08-11 22:01:17 +00002802 const DeclarationNameInfo &NameInfo,
Abramo Bagnara9d9922a2012-02-06 14:31:00 +00002803 const TemplateArgumentListInfo *TemplateArgs) {
Larisse Voufoef4579c2013-08-06 01:03:05 +00002804
Abramo Bagnara9d9922a2012-02-06 14:31:00 +00002805 assert(TemplateArgs || TemplateKWLoc.isValid());
John McCallf7a1a742009-11-24 19:00:30 +00002806 DeclContext *DC;
2807 if (!(DC = computeDeclContext(SS, false)) ||
2808 DC->isDependentContext() ||
John McCall77bb1aa2010-05-01 00:40:08 +00002809 RequireCompleteDeclContext(SS, DC))
Abramo Bagnara9d9922a2012-02-06 14:31:00 +00002810 return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs);
Mike Stump1eb44332009-09-09 15:08:12 +00002811
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002812 bool MemberOfUnknownSpecialization;
Abramo Bagnara25777432010-08-11 22:01:17 +00002813 LookupResult R(*this, NameInfo, LookupOrdinaryName);
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002814 LookupTemplateName(R, (Scope*) 0, SS, QualType(), /*Entering*/ false,
2815 MemberOfUnknownSpecialization);
Mike Stump1eb44332009-09-09 15:08:12 +00002816
John McCallf7a1a742009-11-24 19:00:30 +00002817 if (R.isAmbiguous())
2818 return ExprError();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002819
John McCallf7a1a742009-11-24 19:00:30 +00002820 if (R.empty()) {
Abramo Bagnara25777432010-08-11 22:01:17 +00002821 Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_non_template)
2822 << NameInfo.getName() << SS.getRange();
John McCallf7a1a742009-11-24 19:00:30 +00002823 return ExprError();
2824 }
2825
2826 if (ClassTemplateDecl *Temp = R.getAsSingle<ClassTemplateDecl>()) {
Abramo Bagnara25777432010-08-11 22:01:17 +00002827 Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_class_template)
2828 << (NestedNameSpecifier*) SS.getScopeRep()
2829 << NameInfo.getName() << SS.getRange();
John McCallf7a1a742009-11-24 19:00:30 +00002830 Diag(Temp->getLocation(), diag::note_referenced_class_template);
2831 return ExprError();
2832 }
2833
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002834 return BuildTemplateIdExpr(SS, TemplateKWLoc, R, /*ADL*/ false, TemplateArgs);
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002835}
2836
Douglas Gregorc45c2322009-03-31 00:43:58 +00002837/// \brief Form a dependent template name.
2838///
2839/// This action forms a dependent template name given the template
2840/// name and its (presumably dependent) scope specifier. For
2841/// example, given "MetaFun::template apply", the scope specifier \p
2842/// SS will be "MetaFun::", \p TemplateKWLoc contains the location
2843/// of the "template" keyword, and "apply" is the \p Name.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002844TemplateNameKind Sema::ActOnDependentTemplateName(Scope *S,
Douglas Gregord6ab2322010-06-16 23:00:59 +00002845 CXXScopeSpec &SS,
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002846 SourceLocation TemplateKWLoc,
Douglas Gregord6ab2322010-06-16 23:00:59 +00002847 UnqualifiedId &Name,
John McCallb3d87482010-08-24 05:47:05 +00002848 ParsedType ObjectType,
Douglas Gregord6ab2322010-06-16 23:00:59 +00002849 bool EnteringContext,
2850 TemplateTy &Result) {
Richard Smithebaf0e62011-10-18 20:49:44 +00002851 if (TemplateKWLoc.isValid() && S && !S->getTemplateParamParent())
2852 Diag(TemplateKWLoc,
Richard Smith80ad52f2013-01-02 11:42:31 +00002853 getLangOpts().CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00002854 diag::warn_cxx98_compat_template_outside_of_template :
2855 diag::ext_template_outside_of_template)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002856 << FixItHint::CreateRemoval(TemplateKWLoc);
2857
Douglas Gregor0707bc52010-01-19 16:01:07 +00002858 DeclContext *LookupCtx = 0;
2859 if (SS.isSet())
2860 LookupCtx = computeDeclContext(SS, EnteringContext);
2861 if (!LookupCtx && ObjectType)
John McCallb3d87482010-08-24 05:47:05 +00002862 LookupCtx = computeDeclContext(ObjectType.get());
Douglas Gregor0707bc52010-01-19 16:01:07 +00002863 if (LookupCtx) {
Douglas Gregorc45c2322009-03-31 00:43:58 +00002864 // C++0x [temp.names]p5:
2865 // If a name prefixed by the keyword template is not the name of
2866 // a template, the program is ill-formed. [Note: the keyword
2867 // template may not be applied to non-template members of class
2868 // templates. -end note ] [ Note: as is the case with the
2869 // typename prefix, the template prefix is allowed in cases
2870 // where it is not strictly necessary; i.e., when the
2871 // nested-name-specifier or the expression on the left of the ->
2872 // or . is not dependent on a template-parameter, or the use
2873 // does not appear in the scope of a template. -end note]
2874 //
2875 // Note: C++03 was more strict here, because it banned the use of
2876 // the "template" keyword prior to a template-name that was not a
2877 // dependent name. C++ DR468 relaxed this requirement (the
2878 // "template" keyword is now permitted). We follow the C++0x
Douglas Gregor732281d2010-06-14 22:07:54 +00002879 // rules, even in C++03 mode with a warning, retroactively applying the DR.
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002880 bool MemberOfUnknownSpecialization;
Richard Smithd6537012012-11-15 00:31:27 +00002881 TemplateNameKind TNK = isTemplateName(S, SS, TemplateKWLoc.isValid(), Name,
Abramo Bagnara7c153532010-08-06 12:11:11 +00002882 ObjectType, EnteringContext, Result,
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002883 MemberOfUnknownSpecialization);
Douglas Gregor0707bc52010-01-19 16:01:07 +00002884 if (TNK == TNK_Non_template && LookupCtx->isDependentContext() &&
2885 isa<CXXRecordDecl>(LookupCtx) &&
Douglas Gregord078bd22011-03-11 23:27:41 +00002886 (!cast<CXXRecordDecl>(LookupCtx)->hasDefinition() ||
2887 cast<CXXRecordDecl>(LookupCtx)->hasAnyDependentBases())) {
Douglas Gregord6ab2322010-06-16 23:00:59 +00002888 // This is a dependent template. Handle it below.
Douglas Gregor9edad9b2010-01-14 17:47:39 +00002889 } else if (TNK == TNK_Non_template) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00002890 Diag(Name.getLocStart(),
Douglas Gregor014e88d2009-11-03 23:16:33 +00002891 diag::err_template_kw_refers_to_non_template)
Abramo Bagnara25777432010-08-11 22:01:17 +00002892 << GetNameFromUnqualifiedId(Name).getName()
Douglas Gregor0278e122010-05-05 05:58:24 +00002893 << Name.getSourceRange()
2894 << TemplateKWLoc;
Douglas Gregord6ab2322010-06-16 23:00:59 +00002895 return TNK_Non_template;
Douglas Gregor9edad9b2010-01-14 17:47:39 +00002896 } else {
2897 // We found something; return it.
Douglas Gregord6ab2322010-06-16 23:00:59 +00002898 return TNK;
Douglas Gregorc45c2322009-03-31 00:43:58 +00002899 }
Douglas Gregorc45c2322009-03-31 00:43:58 +00002900 }
2901
Mike Stump1eb44332009-09-09 15:08:12 +00002902 NestedNameSpecifier *Qualifier
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002903 = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002904
Douglas Gregor014e88d2009-11-03 23:16:33 +00002905 switch (Name.getKind()) {
2906 case UnqualifiedId::IK_Identifier:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002907 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
Douglas Gregord6ab2322010-06-16 23:00:59 +00002908 Name.Identifier));
2909 return TNK_Dependent_template_name;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002910
Douglas Gregorca1bdd72009-11-04 00:56:37 +00002911 case UnqualifiedId::IK_OperatorFunctionId:
Douglas Gregord6ab2322010-06-16 23:00:59 +00002912 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
Douglas Gregorca1bdd72009-11-04 00:56:37 +00002913 Name.OperatorFunctionId.Operator));
Douglas Gregord6ab2322010-06-16 23:00:59 +00002914 return TNK_Dependent_template_name;
Sean Hunte6252d12009-11-28 08:58:14 +00002915
2916 case UnqualifiedId::IK_LiteralOperatorId:
David Blaikieb219cfc2011-09-23 05:06:16 +00002917 llvm_unreachable(
2918 "We don't support these; Parse shouldn't have allowed propagation");
Sean Hunte6252d12009-11-28 08:58:14 +00002919
Douglas Gregor014e88d2009-11-03 23:16:33 +00002920 default:
2921 break;
2922 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002923
Daniel Dunbar96a00142012-03-09 18:35:03 +00002924 Diag(Name.getLocStart(),
Douglas Gregor014e88d2009-11-03 23:16:33 +00002925 diag::err_template_kw_refers_to_non_template)
Abramo Bagnara25777432010-08-11 22:01:17 +00002926 << GetNameFromUnqualifiedId(Name).getName()
Douglas Gregor0278e122010-05-05 05:58:24 +00002927 << Name.getSourceRange()
2928 << TemplateKWLoc;
Douglas Gregord6ab2322010-06-16 23:00:59 +00002929 return TNK_Non_template;
Douglas Gregorc45c2322009-03-31 00:43:58 +00002930}
2931
Mike Stump1eb44332009-09-09 15:08:12 +00002932bool Sema::CheckTemplateTypeArgument(TemplateTypeParmDecl *Param,
John McCall833ca992009-10-29 08:12:44 +00002933 const TemplateArgumentLoc &AL,
Chris Lattner5f9e2722011-07-23 10:55:15 +00002934 SmallVectorImpl<TemplateArgument> &Converted) {
John McCall833ca992009-10-29 08:12:44 +00002935 const TemplateArgument &Arg = AL.getArgument();
2936
Anders Carlsson436b1562009-06-13 00:33:33 +00002937 // Check template type parameter.
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002938 switch(Arg.getKind()) {
2939 case TemplateArgument::Type:
Anders Carlsson436b1562009-06-13 00:33:33 +00002940 // C++ [temp.arg.type]p1:
2941 // A template-argument for a template-parameter which is a
2942 // type shall be a type-id.
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002943 break;
2944 case TemplateArgument::Template: {
2945 // We have a template type parameter but the template argument
2946 // is a template without any arguments.
2947 SourceRange SR = AL.getSourceRange();
2948 TemplateName Name = Arg.getAsTemplate();
2949 Diag(SR.getBegin(), diag::err_template_missing_args)
2950 << Name << SR;
2951 if (TemplateDecl *Decl = Name.getAsTemplateDecl())
2952 Diag(Decl->getLocation(), diag::note_template_decl_here);
Anders Carlsson436b1562009-06-13 00:33:33 +00002953
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002954 return true;
2955 }
Kaelyn Uhrainab7ad722012-05-18 23:42:49 +00002956 case TemplateArgument::Expression: {
2957 // We have a template type parameter but the template argument is an
2958 // expression; see if maybe it is missing the "typename" keyword.
2959 CXXScopeSpec SS;
2960 DeclarationNameInfo NameInfo;
2961
2962 if (DeclRefExpr *ArgExpr = dyn_cast<DeclRefExpr>(Arg.getAsExpr())) {
2963 SS.Adopt(ArgExpr->getQualifierLoc());
2964 NameInfo = ArgExpr->getNameInfo();
2965 } else if (DependentScopeDeclRefExpr *ArgExpr =
2966 dyn_cast<DependentScopeDeclRefExpr>(Arg.getAsExpr())) {
2967 SS.Adopt(ArgExpr->getQualifierLoc());
2968 NameInfo = ArgExpr->getNameInfo();
2969 } else if (CXXDependentScopeMemberExpr *ArgExpr =
2970 dyn_cast<CXXDependentScopeMemberExpr>(Arg.getAsExpr())) {
Kaelyn Uhrain8c14de82012-06-08 01:07:26 +00002971 if (ArgExpr->isImplicitAccess()) {
2972 SS.Adopt(ArgExpr->getQualifierLoc());
2973 NameInfo = ArgExpr->getMemberNameInfo();
2974 }
Kaelyn Uhrainab7ad722012-05-18 23:42:49 +00002975 }
2976
Kaelyn Uhrain8c14de82012-06-08 01:07:26 +00002977 if (NameInfo.getName().isIdentifier()) {
Kaelyn Uhrainab7ad722012-05-18 23:42:49 +00002978 LookupResult Result(*this, NameInfo, LookupOrdinaryName);
2979 LookupParsedName(Result, CurScope, &SS);
2980
Kaelyn Uhrain8c14de82012-06-08 01:07:26 +00002981 if (Result.getAsSingle<TypeDecl>() ||
2982 Result.getResultKind() ==
2983 LookupResult::NotFoundInCurrentInstantiation) {
2984 // FIXME: Add a FixIt and fix up the template argument for recovery.
Kaelyn Uhrainab7ad722012-05-18 23:42:49 +00002985 SourceLocation Loc = AL.getSourceRange().getBegin();
2986 Diag(Loc, diag::err_template_arg_must_be_type_suggest);
2987 Diag(Param->getLocation(), diag::note_template_param_here);
2988 return true;
2989 }
2990 }
2991 // fallthrough
2992 }
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002993 default: {
Anders Carlsson436b1562009-06-13 00:33:33 +00002994 // We have a template type parameter but the template argument
2995 // is not a type.
John McCall828bff22009-10-29 18:45:58 +00002996 SourceRange SR = AL.getSourceRange();
2997 Diag(SR.getBegin(), diag::err_template_arg_must_be_type) << SR;
Anders Carlsson436b1562009-06-13 00:33:33 +00002998 Diag(Param->getLocation(), diag::note_template_param_here);
Mike Stump1eb44332009-09-09 15:08:12 +00002999
Anders Carlsson436b1562009-06-13 00:33:33 +00003000 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00003001 }
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00003002 }
Anders Carlsson436b1562009-06-13 00:33:33 +00003003
John McCalla93c9342009-12-07 02:54:59 +00003004 if (CheckTemplateArgument(Param, AL.getTypeSourceInfo()))
Anders Carlsson436b1562009-06-13 00:33:33 +00003005 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00003006
Anders Carlsson436b1562009-06-13 00:33:33 +00003007 // Add the converted template type argument.
Douglas Gregore559ca12011-06-17 22:11:49 +00003008 QualType ArgType = Context.getCanonicalType(Arg.getAsType());
3009
3010 // Objective-C ARC:
3011 // If an explicitly-specified template argument type is a lifetime type
3012 // with no lifetime qualifier, the __strong lifetime qualifier is inferred.
David Blaikie4e4d0842012-03-11 07:00:24 +00003013 if (getLangOpts().ObjCAutoRefCount &&
Douglas Gregore559ca12011-06-17 22:11:49 +00003014 ArgType->isObjCLifetimeType() &&
3015 !ArgType.getObjCLifetime()) {
3016 Qualifiers Qs;
3017 Qs.setObjCLifetime(Qualifiers::OCL_Strong);
3018 ArgType = Context.getQualifiedType(ArgType, Qs);
3019 }
3020
3021 Converted.push_back(TemplateArgument(ArgType));
Anders Carlsson436b1562009-06-13 00:33:33 +00003022 return false;
3023}
3024
Douglas Gregor0f8716b2009-11-09 19:17:50 +00003025/// \brief Substitute template arguments into the default template argument for
3026/// the given template type parameter.
3027///
3028/// \param SemaRef the semantic analysis object for which we are performing
3029/// the substitution.
3030///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003031/// \param Template the template that we are synthesizing template arguments
Douglas Gregor0f8716b2009-11-09 19:17:50 +00003032/// for.
3033///
3034/// \param TemplateLoc the location of the template name that started the
3035/// template-id we are checking.
3036///
3037/// \param RAngleLoc the location of the right angle bracket ('>') that
3038/// terminates the template-id.
3039///
3040/// \param Param the template template parameter whose default we are
3041/// substituting into.
3042///
3043/// \param Converted the list of template arguments provided for template
3044/// parameters that precede \p Param in the template parameter list.
Douglas Gregor0f8716b2009-11-09 19:17:50 +00003045/// \returns the substituted template argument, or NULL if an error occurred.
John McCalla93c9342009-12-07 02:54:59 +00003046static TypeSourceInfo *
Douglas Gregor0f8716b2009-11-09 19:17:50 +00003047SubstDefaultTemplateArgument(Sema &SemaRef,
3048 TemplateDecl *Template,
3049 SourceLocation TemplateLoc,
3050 SourceLocation RAngleLoc,
3051 TemplateTypeParmDecl *Param,
Chris Lattner5f9e2722011-07-23 10:55:15 +00003052 SmallVectorImpl<TemplateArgument> &Converted) {
John McCalla93c9342009-12-07 02:54:59 +00003053 TypeSourceInfo *ArgType = Param->getDefaultArgumentInfo();
Douglas Gregor0f8716b2009-11-09 19:17:50 +00003054
3055 // If the argument type is dependent, instantiate it now based
3056 // on the previously-computed template arguments.
3057 if (ArgType->getType()->isDependentType()) {
Douglas Gregor0f8716b2009-11-09 19:17:50 +00003058 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
Richard Smith7e54fb52012-07-16 01:09:10 +00003059 Template, Converted,
Douglas Gregor0f8716b2009-11-09 19:17:50 +00003060 SourceRange(TemplateLoc, RAngleLoc));
Richard Smithab91ef12012-07-08 02:38:24 +00003061 if (Inst)
3062 return 0;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003063
David Majnemer9d57b8d2013-08-28 23:48:32 +00003064 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
3065 Converted.data(), Converted.size());
3066
3067 // Only substitute for the innermost template argument list.
3068 MultiLevelTemplateArgumentList TemplateArgLists;
3069 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
3070 for (unsigned i = 0, e = Param->getDepth(); i != e; ++i)
3071 TemplateArgLists.addOuterTemplateArguments(None);
3072
Argyrios Kyrtzidisad579912012-04-25 18:39:17 +00003073 Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext());
David Majnemer9d57b8d2013-08-28 23:48:32 +00003074 ArgType =
3075 SemaRef.SubstType(ArgType, TemplateArgLists,
3076 Param->getDefaultArgumentLoc(), Param->getDeclName());
Douglas Gregor0f8716b2009-11-09 19:17:50 +00003077 }
3078
3079 return ArgType;
3080}
3081
3082/// \brief Substitute template arguments into the default template argument for
3083/// the given non-type template parameter.
3084///
3085/// \param SemaRef the semantic analysis object for which we are performing
3086/// the substitution.
3087///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003088/// \param Template the template that we are synthesizing template arguments
Douglas Gregor0f8716b2009-11-09 19:17:50 +00003089/// for.
3090///
3091/// \param TemplateLoc the location of the template name that started the
3092/// template-id we are checking.
3093///
3094/// \param RAngleLoc the location of the right angle bracket ('>') that
3095/// terminates the template-id.
3096///
Douglas Gregor788cd062009-11-11 01:00:40 +00003097/// \param Param the non-type template parameter whose default we are
Douglas Gregor0f8716b2009-11-09 19:17:50 +00003098/// substituting into.
3099///
3100/// \param Converted the list of template arguments provided for template
3101/// parameters that precede \p Param in the template parameter list.
3102///
3103/// \returns the substituted template argument, or NULL if an error occurred.
John McCall60d7b3a2010-08-24 06:29:42 +00003104static ExprResult
Douglas Gregor0f8716b2009-11-09 19:17:50 +00003105SubstDefaultTemplateArgument(Sema &SemaRef,
3106 TemplateDecl *Template,
3107 SourceLocation TemplateLoc,
3108 SourceLocation RAngleLoc,
3109 NonTypeTemplateParmDecl *Param,
Chris Lattner5f9e2722011-07-23 10:55:15 +00003110 SmallVectorImpl<TemplateArgument> &Converted) {
Douglas Gregor0f8716b2009-11-09 19:17:50 +00003111 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
Richard Smith7e54fb52012-07-16 01:09:10 +00003112 Template, Converted,
Douglas Gregor0f8716b2009-11-09 19:17:50 +00003113 SourceRange(TemplateLoc, RAngleLoc));
Richard Smithab91ef12012-07-08 02:38:24 +00003114 if (Inst)
3115 return ExprError();
Douglas Gregor0f8716b2009-11-09 19:17:50 +00003116
David Majnemer9d57b8d2013-08-28 23:48:32 +00003117 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
3118 Converted.data(), Converted.size());
3119
3120 // Only substitute for the innermost template argument list.
3121 MultiLevelTemplateArgumentList TemplateArgLists;
3122 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
3123 for (unsigned i = 0, e = Param->getDepth(); i != e; ++i)
3124 TemplateArgLists.addOuterTemplateArguments(None);
3125
Argyrios Kyrtzidisad579912012-04-25 18:39:17 +00003126 Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext());
Eli Friedman9b94cd12012-04-26 22:43:24 +00003127 EnterExpressionEvaluationContext Unevaluated(SemaRef, Sema::Unevaluated);
David Majnemer9d57b8d2013-08-28 23:48:32 +00003128 return SemaRef.SubstExpr(Param->getDefaultArgument(), TemplateArgLists);
Douglas Gregor0f8716b2009-11-09 19:17:50 +00003129}
3130
Douglas Gregor788cd062009-11-11 01:00:40 +00003131/// \brief Substitute template arguments into the default template argument for
3132/// the given template template parameter.
3133///
3134/// \param SemaRef the semantic analysis object for which we are performing
3135/// the substitution.
3136///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003137/// \param Template the template that we are synthesizing template arguments
Douglas Gregor788cd062009-11-11 01:00:40 +00003138/// for.
3139///
3140/// \param TemplateLoc the location of the template name that started the
3141/// template-id we are checking.
3142///
3143/// \param RAngleLoc the location of the right angle bracket ('>') that
3144/// terminates the template-id.
3145///
3146/// \param Param the template template parameter whose default we are
3147/// substituting into.
3148///
3149/// \param Converted the list of template arguments provided for template
3150/// parameters that precede \p Param in the template parameter list.
3151///
Douglas Gregor1d752d72011-03-02 18:46:51 +00003152/// \param QualifierLoc Will be set to the nested-name-specifier (with
3153/// source-location information) that precedes the template name.
Douglas Gregorb6744ef2011-03-02 17:09:35 +00003154///
Douglas Gregor788cd062009-11-11 01:00:40 +00003155/// \returns the substituted template argument, or NULL if an error occurred.
3156static TemplateName
3157SubstDefaultTemplateArgument(Sema &SemaRef,
3158 TemplateDecl *Template,
3159 SourceLocation TemplateLoc,
3160 SourceLocation RAngleLoc,
3161 TemplateTemplateParmDecl *Param,
Chris Lattner5f9e2722011-07-23 10:55:15 +00003162 SmallVectorImpl<TemplateArgument> &Converted,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00003163 NestedNameSpecifierLoc &QualifierLoc) {
David Majnemer9d57b8d2013-08-28 23:48:32 +00003164 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc, Template, Converted,
Douglas Gregor788cd062009-11-11 01:00:40 +00003165 SourceRange(TemplateLoc, RAngleLoc));
Richard Smithab91ef12012-07-08 02:38:24 +00003166 if (Inst)
3167 return TemplateName();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003168
David Majnemer9d57b8d2013-08-28 23:48:32 +00003169 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
3170 Converted.data(), Converted.size());
3171
3172 // Only substitute for the innermost template argument list.
3173 MultiLevelTemplateArgumentList TemplateArgLists;
3174 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
3175 for (unsigned i = 0, e = Param->getDepth(); i != e; ++i)
3176 TemplateArgLists.addOuterTemplateArguments(None);
3177
Argyrios Kyrtzidisad579912012-04-25 18:39:17 +00003178 Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext());
David Majnemer9d57b8d2013-08-28 23:48:32 +00003179 // Substitute into the nested-name-specifier first,
Douglas Gregor1d752d72011-03-02 18:46:51 +00003180 QualifierLoc = Param->getDefaultArgument().getTemplateQualifierLoc();
Douglas Gregorb6744ef2011-03-02 17:09:35 +00003181 if (QualifierLoc) {
David Majnemer9d57b8d2013-08-28 23:48:32 +00003182 QualifierLoc =
3183 SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, TemplateArgLists);
Douglas Gregorb6744ef2011-03-02 17:09:35 +00003184 if (!QualifierLoc)
3185 return TemplateName();
3186 }
David Majnemer9d57b8d2013-08-28 23:48:32 +00003187
3188 return SemaRef.SubstTemplateName(
3189 QualifierLoc,
3190 Param->getDefaultArgument().getArgument().getAsTemplate(),
3191 Param->getDefaultArgument().getTemplateNameLoc(),
3192 TemplateArgLists);
Douglas Gregor788cd062009-11-11 01:00:40 +00003193}
3194
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00003195/// \brief If the given template parameter has a default template
3196/// argument, substitute into that default template argument and
3197/// return the corresponding template argument.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003198TemplateArgumentLoc
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00003199Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
3200 SourceLocation TemplateLoc,
3201 SourceLocation RAngleLoc,
3202 Decl *Param,
Richard Smith305e5b42013-07-04 01:01:24 +00003203 SmallVectorImpl<TemplateArgument>
3204 &Converted,
3205 bool &HasDefaultArg) {
3206 HasDefaultArg = false;
3207
3208 if (TemplateTypeParmDecl *TypeParm = dyn_cast<TemplateTypeParmDecl>(Param)) {
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00003209 if (!TypeParm->hasDefaultArgument())
3210 return TemplateArgumentLoc();
3211
Richard Smith305e5b42013-07-04 01:01:24 +00003212 HasDefaultArg = true;
John McCalla93c9342009-12-07 02:54:59 +00003213 TypeSourceInfo *DI = SubstDefaultTemplateArgument(*this, Template,
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00003214 TemplateLoc,
3215 RAngleLoc,
3216 TypeParm,
3217 Converted);
3218 if (DI)
3219 return TemplateArgumentLoc(TemplateArgument(DI->getType()), DI);
3220
3221 return TemplateArgumentLoc();
3222 }
3223
3224 if (NonTypeTemplateParmDecl *NonTypeParm
3225 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
3226 if (!NonTypeParm->hasDefaultArgument())
3227 return TemplateArgumentLoc();
3228
Richard Smith305e5b42013-07-04 01:01:24 +00003229 HasDefaultArg = true;
John McCall60d7b3a2010-08-24 06:29:42 +00003230 ExprResult Arg = SubstDefaultTemplateArgument(*this, Template,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00003231 TemplateLoc,
3232 RAngleLoc,
3233 NonTypeParm,
3234 Converted);
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00003235 if (Arg.isInvalid())
3236 return TemplateArgumentLoc();
3237
3238 Expr *ArgE = Arg.takeAs<Expr>();
3239 return TemplateArgumentLoc(TemplateArgument(ArgE), ArgE);
3240 }
3241
3242 TemplateTemplateParmDecl *TempTempParm
3243 = cast<TemplateTemplateParmDecl>(Param);
3244 if (!TempTempParm->hasDefaultArgument())
3245 return TemplateArgumentLoc();
3246
Richard Smith305e5b42013-07-04 01:01:24 +00003247 HasDefaultArg = true;
Douglas Gregor1d752d72011-03-02 18:46:51 +00003248 NestedNameSpecifierLoc QualifierLoc;
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00003249 TemplateName TName = SubstDefaultTemplateArgument(*this, Template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003250 TemplateLoc,
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00003251 RAngleLoc,
3252 TempTempParm,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00003253 Converted,
3254 QualifierLoc);
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00003255 if (TName.isNull())
3256 return TemplateArgumentLoc();
3257
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003258 return TemplateArgumentLoc(TemplateArgument(TName),
Douglas Gregorb6744ef2011-03-02 17:09:35 +00003259 TempTempParm->getDefaultArgument().getTemplateQualifierLoc(),
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00003260 TempTempParm->getDefaultArgument().getTemplateNameLoc());
3261}
3262
Douglas Gregore7526412009-11-11 19:31:23 +00003263/// \brief Check that the given template argument corresponds to the given
3264/// template parameter.
Douglas Gregor6952f1e2011-01-19 20:10:05 +00003265///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003266/// \param Param The template parameter against which the argument will be
Douglas Gregor6952f1e2011-01-19 20:10:05 +00003267/// checked.
3268///
3269/// \param Arg The template argument.
3270///
3271/// \param Template The template in which the template argument resides.
3272///
3273/// \param TemplateLoc The location of the template name for the template
3274/// whose argument list we're matching.
3275///
3276/// \param RAngleLoc The location of the right angle bracket ('>') that closes
3277/// the template argument list.
3278///
3279/// \param ArgumentPackIndex The index into the argument pack where this
3280/// argument will be placed. Only valid if the parameter is a parameter pack.
3281///
3282/// \param Converted The checked, converted argument will be added to the
3283/// end of this small vector.
3284///
3285/// \param CTAK Describes how we arrived at this particular template argument:
3286/// explicitly written, deduced, etc.
3287///
3288/// \returns true on error, false otherwise.
Douglas Gregore7526412009-11-11 19:31:23 +00003289bool Sema::CheckTemplateArgument(NamedDecl *Param,
3290 const TemplateArgumentLoc &Arg,
Douglas Gregor54c53cc2011-01-04 23:35:54 +00003291 NamedDecl *Template,
Douglas Gregore7526412009-11-11 19:31:23 +00003292 SourceLocation TemplateLoc,
Douglas Gregore7526412009-11-11 19:31:23 +00003293 SourceLocation RAngleLoc,
Douglas Gregor6952f1e2011-01-19 20:10:05 +00003294 unsigned ArgumentPackIndex,
Chris Lattner5f9e2722011-07-23 10:55:15 +00003295 SmallVectorImpl<TemplateArgument> &Converted,
Douglas Gregor02024a92010-03-28 02:42:43 +00003296 CheckTemplateArgumentKind CTAK) {
Douglas Gregord9e15302009-11-11 19:41:09 +00003297 // Check template type parameters.
3298 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param))
Douglas Gregore7526412009-11-11 19:31:23 +00003299 return CheckTemplateTypeArgument(TTP, Arg, Converted);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003300
Douglas Gregord9e15302009-11-11 19:41:09 +00003301 // Check non-type template parameters.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003302 if (NonTypeTemplateParmDecl *NTTP =dyn_cast<NonTypeTemplateParmDecl>(Param)) {
Douglas Gregore7526412009-11-11 19:31:23 +00003303 // Do substitution on the type of the non-type template parameter
Peter Collingbourne9f6f6a12010-12-10 17:08:53 +00003304 // with the template arguments we've seen thus far. But if the
3305 // template has a dependent context then we cannot substitute yet.
Douglas Gregore7526412009-11-11 19:31:23 +00003306 QualType NTTPType = NTTP->getType();
Douglas Gregor6952f1e2011-01-19 20:10:05 +00003307 if (NTTP->isParameterPack() && NTTP->isExpandedParameterPack())
3308 NTTPType = NTTP->getExpansionType(ArgumentPackIndex);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003309
Peter Collingbourne9f6f6a12010-12-10 17:08:53 +00003310 if (NTTPType->isDependentType() &&
3311 !isa<TemplateTemplateParmDecl>(Template) &&
3312 !Template->getDeclContext()->isDependentContext()) {
Douglas Gregore7526412009-11-11 19:31:23 +00003313 // Do substitution on the type of the non-type template parameter.
3314 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
Richard Smith7e54fb52012-07-16 01:09:10 +00003315 NTTP, Converted,
Douglas Gregore7526412009-11-11 19:31:23 +00003316 SourceRange(TemplateLoc, RAngleLoc));
Richard Smithab91ef12012-07-08 02:38:24 +00003317 if (Inst)
3318 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003319
3320 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00003321 Converted.data(), Converted.size());
Douglas Gregore7526412009-11-11 19:31:23 +00003322 NTTPType = SubstType(NTTPType,
3323 MultiLevelTemplateArgumentList(TemplateArgs),
3324 NTTP->getLocation(),
3325 NTTP->getDeclName());
3326 // If that worked, check the non-type template parameter type
3327 // for validity.
3328 if (!NTTPType.isNull())
3329 NTTPType = CheckNonTypeTemplateParameterType(NTTPType,
3330 NTTP->getLocation());
3331 if (NTTPType.isNull())
3332 return true;
3333 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003334
Douglas Gregore7526412009-11-11 19:31:23 +00003335 switch (Arg.getArgument().getKind()) {
3336 case TemplateArgument::Null:
David Blaikieb219cfc2011-09-23 05:06:16 +00003337 llvm_unreachable("Should never see a NULL template argument here");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003338
Douglas Gregore7526412009-11-11 19:31:23 +00003339 case TemplateArgument::Expression: {
Douglas Gregore7526412009-11-11 19:31:23 +00003340 TemplateArgument Result;
John Wiegley429bb272011-04-08 18:41:53 +00003341 ExprResult Res =
3342 CheckTemplateArgument(NTTP, NTTPType, Arg.getArgument().getAsExpr(),
3343 Result, CTAK);
3344 if (Res.isInvalid())
Douglas Gregore7526412009-11-11 19:31:23 +00003345 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003346
Douglas Gregor910f8002010-11-07 23:05:16 +00003347 Converted.push_back(Result);
Douglas Gregore7526412009-11-11 19:31:23 +00003348 break;
3349 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003350
Douglas Gregore7526412009-11-11 19:31:23 +00003351 case TemplateArgument::Declaration:
3352 case TemplateArgument::Integral:
Eli Friedmand7a6b162012-09-26 02:36:12 +00003353 case TemplateArgument::NullPtr:
Douglas Gregore7526412009-11-11 19:31:23 +00003354 // We've already checked this template argument, so just copy
3355 // it to the list of converted arguments.
Douglas Gregor910f8002010-11-07 23:05:16 +00003356 Converted.push_back(Arg.getArgument());
Douglas Gregore7526412009-11-11 19:31:23 +00003357 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003358
Douglas Gregore7526412009-11-11 19:31:23 +00003359 case TemplateArgument::Template:
Douglas Gregora7fc9012011-01-05 18:58:31 +00003360 case TemplateArgument::TemplateExpansion:
Douglas Gregore7526412009-11-11 19:31:23 +00003361 // We were given a template template argument. It may not be ill-formed;
3362 // see below.
3363 if (DependentTemplateName *DTN
Douglas Gregora7fc9012011-01-05 18:58:31 +00003364 = Arg.getArgument().getAsTemplateOrTemplatePattern()
3365 .getAsDependentTemplateName()) {
Douglas Gregore7526412009-11-11 19:31:23 +00003366 // We have a template argument such as \c T::template X, which we
3367 // parsed as a template template argument. However, since we now
3368 // know that we need a non-type template argument, convert this
Abramo Bagnara25777432010-08-11 22:01:17 +00003369 // template name into an expression.
3370
3371 DeclarationNameInfo NameInfo(DTN->getIdentifier(),
3372 Arg.getTemplateNameLoc());
3373
Douglas Gregor00cf3cc2011-02-25 20:49:16 +00003374 CXXScopeSpec SS;
Douglas Gregorb6744ef2011-03-02 17:09:35 +00003375 SS.Adopt(Arg.getTemplateQualifierLoc());
Abramo Bagnarae4b92762012-01-27 09:46:47 +00003376 // FIXME: the template-template arg was a DependentTemplateName,
3377 // so it was provided with a template keyword. However, its source
3378 // location is not stored in the template argument structure.
3379 SourceLocation TemplateKWLoc;
John Wiegley429bb272011-04-08 18:41:53 +00003380 ExprResult E = Owned(DependentScopeDeclRefExpr::Create(Context,
Douglas Gregor00cf3cc2011-02-25 20:49:16 +00003381 SS.getWithLocInContext(Context),
Abramo Bagnarae4b92762012-01-27 09:46:47 +00003382 TemplateKWLoc,
3383 NameInfo, 0));
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003384
Douglas Gregora7fc9012011-01-05 18:58:31 +00003385 // If we parsed the template argument as a pack expansion, create a
3386 // pack expansion expression.
3387 if (Arg.getArgument().getKind() == TemplateArgument::TemplateExpansion){
John Wiegley429bb272011-04-08 18:41:53 +00003388 E = ActOnPackExpansion(E.take(), Arg.getTemplateEllipsisLoc());
3389 if (E.isInvalid())
Douglas Gregora7fc9012011-01-05 18:58:31 +00003390 return true;
Douglas Gregora7fc9012011-01-05 18:58:31 +00003391 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003392
Douglas Gregore7526412009-11-11 19:31:23 +00003393 TemplateArgument Result;
John Wiegley429bb272011-04-08 18:41:53 +00003394 E = CheckTemplateArgument(NTTP, NTTPType, E.take(), Result);
3395 if (E.isInvalid())
Douglas Gregore7526412009-11-11 19:31:23 +00003396 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003397
Douglas Gregor910f8002010-11-07 23:05:16 +00003398 Converted.push_back(Result);
Douglas Gregore7526412009-11-11 19:31:23 +00003399 break;
3400 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003401
Douglas Gregore7526412009-11-11 19:31:23 +00003402 // We have a template argument that actually does refer to a class
Richard Smith3e4c6c42011-05-05 21:57:07 +00003403 // template, alias template, or template template parameter, and
Douglas Gregore7526412009-11-11 19:31:23 +00003404 // therefore cannot be a non-type template argument.
3405 Diag(Arg.getLocation(), diag::err_template_arg_must_be_expr)
3406 << Arg.getSourceRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003407
Douglas Gregore7526412009-11-11 19:31:23 +00003408 Diag(Param->getLocation(), diag::note_template_param_here);
3409 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003410
Douglas Gregore7526412009-11-11 19:31:23 +00003411 case TemplateArgument::Type: {
3412 // We have a non-type template parameter but the template
3413 // argument is a type.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003414
Douglas Gregore7526412009-11-11 19:31:23 +00003415 // C++ [temp.arg]p2:
3416 // In a template-argument, an ambiguity between a type-id and
3417 // an expression is resolved to a type-id, regardless of the
3418 // form of the corresponding template-parameter.
3419 //
3420 // We warn specifically about this case, since it can be rather
3421 // confusing for users.
3422 QualType T = Arg.getArgument().getAsType();
3423 SourceRange SR = Arg.getSourceRange();
3424 if (T->isFunctionType())
3425 Diag(SR.getBegin(), diag::err_template_arg_nontype_ambig) << SR << T;
3426 else
3427 Diag(SR.getBegin(), diag::err_template_arg_must_be_expr) << SR;
3428 Diag(Param->getLocation(), diag::note_template_param_here);
3429 return true;
3430 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003431
Douglas Gregore7526412009-11-11 19:31:23 +00003432 case TemplateArgument::Pack:
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +00003433 llvm_unreachable("Caller must expand template argument packs");
Douglas Gregore7526412009-11-11 19:31:23 +00003434 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003435
Douglas Gregore7526412009-11-11 19:31:23 +00003436 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003437 }
3438
3439
Douglas Gregore7526412009-11-11 19:31:23 +00003440 // Check template template parameters.
3441 TemplateTemplateParmDecl *TempParm = cast<TemplateTemplateParmDecl>(Param);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003442
Douglas Gregore7526412009-11-11 19:31:23 +00003443 // Substitute into the template parameter list of the template
3444 // template parameter, since previously-supplied template arguments
3445 // may appear within the template template parameter.
3446 {
3447 // Set up a template instantiation context.
3448 LocalInstantiationScope Scope(*this);
3449 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
Richard Smith7e54fb52012-07-16 01:09:10 +00003450 TempParm, Converted,
Douglas Gregore7526412009-11-11 19:31:23 +00003451 SourceRange(TemplateLoc, RAngleLoc));
Richard Smithab91ef12012-07-08 02:38:24 +00003452 if (Inst)
3453 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003454
3455 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00003456 Converted.data(), Converted.size());
Douglas Gregore7526412009-11-11 19:31:23 +00003457 TempParm = cast_or_null<TemplateTemplateParmDecl>(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003458 SubstDecl(TempParm, CurContext,
Douglas Gregore7526412009-11-11 19:31:23 +00003459 MultiLevelTemplateArgumentList(TemplateArgs)));
3460 if (!TempParm)
3461 return true;
Douglas Gregore7526412009-11-11 19:31:23 +00003462 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003463
Douglas Gregore7526412009-11-11 19:31:23 +00003464 switch (Arg.getArgument().getKind()) {
3465 case TemplateArgument::Null:
David Blaikieb219cfc2011-09-23 05:06:16 +00003466 llvm_unreachable("Should never see a NULL template argument here");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003467
Douglas Gregore7526412009-11-11 19:31:23 +00003468 case TemplateArgument::Template:
Douglas Gregora7fc9012011-01-05 18:58:31 +00003469 case TemplateArgument::TemplateExpansion:
Richard Smith6964b3f2012-09-07 02:06:42 +00003470 if (CheckTemplateArgument(TempParm, Arg, ArgumentPackIndex))
Douglas Gregore7526412009-11-11 19:31:23 +00003471 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003472
Douglas Gregor910f8002010-11-07 23:05:16 +00003473 Converted.push_back(Arg.getArgument());
Douglas Gregore7526412009-11-11 19:31:23 +00003474 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003475
Douglas Gregore7526412009-11-11 19:31:23 +00003476 case TemplateArgument::Expression:
3477 case TemplateArgument::Type:
3478 // We have a template template parameter but the template
3479 // argument does not refer to a template.
Richard Smith3e4c6c42011-05-05 21:57:07 +00003480 Diag(Arg.getLocation(), diag::err_template_arg_must_be_template)
Richard Smith80ad52f2013-01-02 11:42:31 +00003481 << getLangOpts().CPlusPlus11;
Douglas Gregore7526412009-11-11 19:31:23 +00003482 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003483
Douglas Gregore7526412009-11-11 19:31:23 +00003484 case TemplateArgument::Declaration:
David Blaikie7530c032012-01-17 06:56:22 +00003485 llvm_unreachable("Declaration argument with template template parameter");
Douglas Gregore7526412009-11-11 19:31:23 +00003486 case TemplateArgument::Integral:
David Blaikie7530c032012-01-17 06:56:22 +00003487 llvm_unreachable("Integral argument with template template parameter");
Eli Friedmand7a6b162012-09-26 02:36:12 +00003488 case TemplateArgument::NullPtr:
3489 llvm_unreachable("Null pointer argument with template template parameter");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003490
Douglas Gregore7526412009-11-11 19:31:23 +00003491 case TemplateArgument::Pack:
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +00003492 llvm_unreachable("Caller must expand template argument packs");
Douglas Gregore7526412009-11-11 19:31:23 +00003493 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003494
Douglas Gregore7526412009-11-11 19:31:23 +00003495 return false;
3496}
3497
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003498/// \brief Diagnose an arity mismatch in the
3499static bool diagnoseArityMismatch(Sema &S, TemplateDecl *Template,
3500 SourceLocation TemplateLoc,
3501 TemplateArgumentListInfo &TemplateArgs) {
3502 TemplateParameterList *Params = Template->getTemplateParameters();
3503 unsigned NumParams = Params->size();
3504 unsigned NumArgs = TemplateArgs.size();
3505
3506 SourceRange Range;
3507 if (NumArgs > NumParams)
3508 Range = SourceRange(TemplateArgs[NumParams].getLocation(),
3509 TemplateArgs.getRAngleLoc());
3510 S.Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
3511 << (NumArgs > NumParams)
3512 << (isa<ClassTemplateDecl>(Template)? 0 :
3513 isa<FunctionTemplateDecl>(Template)? 1 :
3514 isa<TemplateTemplateParmDecl>(Template)? 2 : 3)
3515 << Template << Range;
3516 S.Diag(Template->getLocation(), diag::note_template_decl_here)
3517 << Params->getSourceRange();
3518 return true;
3519}
3520
Richard Smith6964b3f2012-09-07 02:06:42 +00003521/// \brief Check whether the template parameter is a pack expansion, and if so,
3522/// determine the number of parameters produced by that expansion. For instance:
3523///
3524/// \code
3525/// template<typename ...Ts> struct A {
3526/// template<Ts ...NTs, template<Ts> class ...TTs, typename ...Us> struct B;
3527/// };
3528/// \endcode
3529///
3530/// In \c A<int,int>::B, \c NTs and \c TTs have expanded pack size 2, and \c Us
3531/// is not a pack expansion, so returns an empty Optional.
David Blaikiedc84cd52013-02-20 22:23:23 +00003532static Optional<unsigned> getExpandedPackSize(NamedDecl *Param) {
Richard Smith6964b3f2012-09-07 02:06:42 +00003533 if (NonTypeTemplateParmDecl *NTTP
3534 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
3535 if (NTTP->isExpandedParameterPack())
3536 return NTTP->getNumExpansionTypes();
3537 }
3538
3539 if (TemplateTemplateParmDecl *TTP
3540 = dyn_cast<TemplateTemplateParmDecl>(Param)) {
3541 if (TTP->isExpandedParameterPack())
3542 return TTP->getNumExpansionTemplateParameters();
3543 }
3544
David Blaikie66874fb2013-02-21 01:47:18 +00003545 return None;
Richard Smith6964b3f2012-09-07 02:06:42 +00003546}
3547
Douglas Gregorc15cb382009-02-09 23:23:08 +00003548/// \brief Check that the given template argument list is well-formed
3549/// for specializing the given template.
3550bool Sema::CheckTemplateArgumentList(TemplateDecl *Template,
3551 SourceLocation TemplateLoc,
Douglas Gregor67714232011-03-03 02:41:12 +00003552 TemplateArgumentListInfo &TemplateArgs,
Douglas Gregor16134c62009-07-01 00:28:38 +00003553 bool PartialTemplateArgs,
Douglas Gregorb70126a2012-02-03 17:16:23 +00003554 SmallVectorImpl<TemplateArgument> &Converted,
3555 bool *ExpansionIntoFixedList) {
3556 if (ExpansionIntoFixedList)
3557 *ExpansionIntoFixedList = false;
3558
Douglas Gregorc15cb382009-02-09 23:23:08 +00003559 TemplateParameterList *Params = Template->getTemplateParameters();
Douglas Gregorc15cb382009-02-09 23:23:08 +00003560
John McCalld5532b62009-11-23 01:53:49 +00003561 SourceLocation RAngleLoc = TemplateArgs.getRAngleLoc();
3562
Mike Stump1eb44332009-09-09 15:08:12 +00003563 // C++ [temp.arg]p1:
Douglas Gregorc15cb382009-02-09 23:23:08 +00003564 // [...] The type and form of each template-argument specified in
3565 // a template-id shall match the type and form specified for the
3566 // corresponding parameter declared by the template in its
3567 // template-parameter-list.
Douglas Gregor67714232011-03-03 02:41:12 +00003568 bool isTemplateTemplateParameter = isa<TemplateTemplateParmDecl>(Template);
Chris Lattner5f9e2722011-07-23 10:55:15 +00003569 SmallVector<TemplateArgument, 2> ArgumentPack;
Richard Smith6964b3f2012-09-07 02:06:42 +00003570 unsigned ArgIdx = 0, NumArgs = TemplateArgs.size();
Douglas Gregor8dde14e2011-01-24 16:14:37 +00003571 LocalInstantiationScope InstScope(*this, true);
Richard Smith6964b3f2012-09-07 02:06:42 +00003572 for (TemplateParameterList::iterator Param = Params->begin(),
3573 ParamEnd = Params->end();
3574 Param != ParamEnd; /* increment in loop */) {
3575 // If we have an expanded parameter pack, make sure we don't have too
3576 // many arguments.
David Blaikiedc84cd52013-02-20 22:23:23 +00003577 if (Optional<unsigned> Expansions = getExpandedPackSize(*Param)) {
Richard Smith6964b3f2012-09-07 02:06:42 +00003578 if (*Expansions == ArgumentPack.size()) {
3579 // We're done with this parameter pack. Pack up its arguments and add
3580 // them to the list.
Eli Friedmand7a6b162012-09-26 02:36:12 +00003581 Converted.push_back(
3582 TemplateArgument::CreatePackCopy(Context,
3583 ArgumentPack.data(),
3584 ArgumentPack.size()));
3585 ArgumentPack.clear();
3586
Richard Smith6964b3f2012-09-07 02:06:42 +00003587 // This argument is assigned to the next parameter.
3588 ++Param;
3589 continue;
3590 } else if (ArgIdx == NumArgs && !PartialTemplateArgs) {
3591 // Not enough arguments for this parameter pack.
3592 Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
3593 << false
3594 << (isa<ClassTemplateDecl>(Template)? 0 :
3595 isa<FunctionTemplateDecl>(Template)? 1 :
3596 isa<TemplateTemplateParmDecl>(Template)? 2 : 3)
3597 << Template;
3598 Diag(Template->getLocation(), diag::note_template_decl_here)
3599 << Params->getSourceRange();
3600 return true;
Douglas Gregor6952f1e2011-01-19 20:10:05 +00003601 }
Richard Smith6964b3f2012-09-07 02:06:42 +00003602 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003603
Richard Smith6964b3f2012-09-07 02:06:42 +00003604 if (ArgIdx < NumArgs) {
Douglas Gregorf35f8282009-11-11 21:54:23 +00003605 // Check the template argument we were given.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003606 if (CheckTemplateArgument(*Param, TemplateArgs[ArgIdx], Template,
3607 TemplateLoc, RAngleLoc,
Douglas Gregor6952f1e2011-01-19 20:10:05 +00003608 ArgumentPack.size(), Converted))
Douglas Gregorf35f8282009-11-11 21:54:23 +00003609 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003610
Richard Smith6964b3f2012-09-07 02:06:42 +00003611 // We're now done with this argument.
3612 ++ArgIdx;
3613
Douglas Gregor14be16b2010-12-20 16:57:52 +00003614 if ((*Param)->isTemplateParameterPack()) {
3615 // The template parameter was a template parameter pack, so take the
3616 // deduced argument and place it on the argument pack. Note that we
3617 // stay on the same template parameter so that we can deduce more
3618 // arguments.
Robert Wilhelm344472e2013-08-23 16:11:15 +00003619 ArgumentPack.push_back(Converted.pop_back_val());
Douglas Gregor14be16b2010-12-20 16:57:52 +00003620 } else {
3621 // Move to the next template parameter.
3622 ++Param;
3623 }
Richard Smith6964b3f2012-09-07 02:06:42 +00003624
3625 // If we just saw a pack expansion, then directly convert the remaining
3626 // arguments, because we don't know what parameters they'll match up
3627 // with.
3628 if (TemplateArgs[ArgIdx-1].getArgument().isPackExpansion()) {
3629 bool InFinalParameterPack = Param != ParamEnd &&
3630 Param + 1 == ParamEnd &&
3631 (*Param)->isTemplateParameterPack() &&
3632 !getExpandedPackSize(*Param);
3633
3634 if (!InFinalParameterPack && !ArgumentPack.empty()) {
3635 // If we were part way through filling in an expanded parameter pack,
3636 // fall back to just producing individual arguments.
3637 Converted.insert(Converted.end(),
3638 ArgumentPack.begin(), ArgumentPack.end());
3639 ArgumentPack.clear();
3640 }
3641
3642 while (ArgIdx < NumArgs) {
3643 if (InFinalParameterPack)
3644 ArgumentPack.push_back(TemplateArgs[ArgIdx].getArgument());
3645 else
3646 Converted.push_back(TemplateArgs[ArgIdx].getArgument());
3647 ++ArgIdx;
3648 }
3649
3650 // Push the argument pack onto the list of converted arguments.
3651 if (InFinalParameterPack) {
Eli Friedmand7a6b162012-09-26 02:36:12 +00003652 Converted.push_back(
3653 TemplateArgument::CreatePackCopy(Context,
3654 ArgumentPack.data(),
3655 ArgumentPack.size()));
3656 ArgumentPack.clear();
Richard Smith6964b3f2012-09-07 02:06:42 +00003657 } else if (ExpansionIntoFixedList) {
3658 // We have expanded a pack into a fixed list.
3659 *ExpansionIntoFixedList = true;
3660 }
3661
3662 return false;
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003663 }
Richard Smith6964b3f2012-09-07 02:06:42 +00003664
Douglas Gregorf35f8282009-11-11 21:54:23 +00003665 continue;
Douglas Gregor3e00bad2009-02-17 01:05:43 +00003666 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003667
Douglas Gregor8735b292011-06-03 02:59:40 +00003668 // If we're checking a partial template argument list, we're done.
3669 if (PartialTemplateArgs) {
3670 if ((*Param)->isTemplateParameterPack() && !ArgumentPack.empty())
3671 Converted.push_back(TemplateArgument::CreatePackCopy(Context,
3672 ArgumentPack.data(),
3673 ArgumentPack.size()));
3674
Richard Smith6964b3f2012-09-07 02:06:42 +00003675 return false;
Douglas Gregor8735b292011-06-03 02:59:40 +00003676 }
3677
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003678 // If we have a template parameter pack with no more corresponding
Douglas Gregor14be16b2010-12-20 16:57:52 +00003679 // arguments, just break out now and we'll fill in the argument pack below.
Richard Smith6964b3f2012-09-07 02:06:42 +00003680 if ((*Param)->isTemplateParameterPack()) {
3681 assert(!getExpandedPackSize(*Param) &&
3682 "Should have dealt with this already");
3683
3684 // A non-expanded parameter pack before the end of the parameter list
3685 // only occurs for an ill-formed template parameter list, unless we've
3686 // got a partial argument list for a function template, so just bail out.
3687 if (Param + 1 != ParamEnd)
3688 return true;
3689
Eli Friedmand7a6b162012-09-26 02:36:12 +00003690 Converted.push_back(TemplateArgument::CreatePackCopy(Context,
3691 ArgumentPack.data(),
3692 ArgumentPack.size()));
3693 ArgumentPack.clear();
Richard Smith6964b3f2012-09-07 02:06:42 +00003694
3695 ++Param;
3696 continue;
3697 }
3698
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003699 // Check whether we have a default argument.
Douglas Gregorf35f8282009-11-11 21:54:23 +00003700 TemplateArgumentLoc Arg;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003701
Douglas Gregorf35f8282009-11-11 21:54:23 +00003702 // Retrieve the default template argument from the template
3703 // parameter. For each kind of template parameter, we substitute the
3704 // template arguments provided thus far and any "outer" template arguments
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003705 // (when the template parameter was part of a nested template) into
Douglas Gregorf35f8282009-11-11 21:54:23 +00003706 // the default argument.
3707 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*Param)) {
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003708 if (!TTP->hasDefaultArgument())
3709 return diagnoseArityMismatch(*this, Template, TemplateLoc,
3710 TemplateArgs);
Douglas Gregorf35f8282009-11-11 21:54:23 +00003711
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003712 TypeSourceInfo *ArgType = SubstDefaultTemplateArgument(*this,
Douglas Gregorf35f8282009-11-11 21:54:23 +00003713 Template,
3714 TemplateLoc,
3715 RAngleLoc,
3716 TTP,
3717 Converted);
3718 if (!ArgType)
3719 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003720
Douglas Gregorf35f8282009-11-11 21:54:23 +00003721 Arg = TemplateArgumentLoc(TemplateArgument(ArgType->getType()),
3722 ArgType);
3723 } else if (NonTypeTemplateParmDecl *NTTP
3724 = dyn_cast<NonTypeTemplateParmDecl>(*Param)) {
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003725 if (!NTTP->hasDefaultArgument())
3726 return diagnoseArityMismatch(*this, Template, TemplateLoc,
3727 TemplateArgs);
Douglas Gregorf35f8282009-11-11 21:54:23 +00003728
John McCall60d7b3a2010-08-24 06:29:42 +00003729 ExprResult E = SubstDefaultTemplateArgument(*this, Template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003730 TemplateLoc,
3731 RAngleLoc,
3732 NTTP,
Douglas Gregorf35f8282009-11-11 21:54:23 +00003733 Converted);
3734 if (E.isInvalid())
3735 return true;
3736
3737 Expr *Ex = E.takeAs<Expr>();
3738 Arg = TemplateArgumentLoc(TemplateArgument(Ex), Ex);
3739 } else {
3740 TemplateTemplateParmDecl *TempParm
3741 = cast<TemplateTemplateParmDecl>(*Param);
3742
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003743 if (!TempParm->hasDefaultArgument())
3744 return diagnoseArityMismatch(*this, Template, TemplateLoc,
3745 TemplateArgs);
Douglas Gregorf35f8282009-11-11 21:54:23 +00003746
Douglas Gregor1d752d72011-03-02 18:46:51 +00003747 NestedNameSpecifierLoc QualifierLoc;
Douglas Gregorf35f8282009-11-11 21:54:23 +00003748 TemplateName Name = SubstDefaultTemplateArgument(*this, Template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003749 TemplateLoc,
3750 RAngleLoc,
Douglas Gregorf35f8282009-11-11 21:54:23 +00003751 TempParm,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00003752 Converted,
3753 QualifierLoc);
Douglas Gregorf35f8282009-11-11 21:54:23 +00003754 if (Name.isNull())
3755 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003756
Douglas Gregorb6744ef2011-03-02 17:09:35 +00003757 Arg = TemplateArgumentLoc(TemplateArgument(Name), QualifierLoc,
3758 TempParm->getDefaultArgument().getTemplateNameLoc());
Douglas Gregorf35f8282009-11-11 21:54:23 +00003759 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003760
Douglas Gregorf35f8282009-11-11 21:54:23 +00003761 // Introduce an instantiation record that describes where we are using
3762 // the default template argument.
Richard Smith7e54fb52012-07-16 01:09:10 +00003763 InstantiatingTemplate Instantiating(*this, RAngleLoc, Template,
3764 *Param, Converted,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003765 SourceRange(TemplateLoc, RAngleLoc));
Richard Smithab91ef12012-07-08 02:38:24 +00003766 if (Instantiating)
3767 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003768
Douglas Gregorf35f8282009-11-11 21:54:23 +00003769 // Check the default template argument.
Douglas Gregord9e15302009-11-11 19:41:09 +00003770 if (CheckTemplateArgument(*Param, Arg, Template, TemplateLoc,
Douglas Gregor6952f1e2011-01-19 20:10:05 +00003771 RAngleLoc, 0, Converted))
Douglas Gregore7526412009-11-11 19:31:23 +00003772 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003773
Douglas Gregor67714232011-03-03 02:41:12 +00003774 // Core issue 150 (assumed resolution): if this is a template template
3775 // parameter, keep track of the default template arguments from the
3776 // template definition.
3777 if (isTemplateTemplateParameter)
3778 TemplateArgs.addArgument(Arg);
3779
Douglas Gregor14be16b2010-12-20 16:57:52 +00003780 // Move to the next template parameter and argument.
3781 ++Param;
3782 ++ArgIdx;
Douglas Gregorc15cb382009-02-09 23:23:08 +00003783 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003784
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003785 // If we have any leftover arguments, then there were too many arguments.
3786 // Complain and fail.
3787 if (ArgIdx < NumArgs)
3788 return diagnoseArityMismatch(*this, Template, TemplateLoc, TemplateArgs);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003789
Richard Smith6964b3f2012-09-07 02:06:42 +00003790 return false;
Douglas Gregorc15cb382009-02-09 23:23:08 +00003791}
3792
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003793namespace {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003794 class UnnamedLocalNoLinkageFinder
3795 : public TypeVisitor<UnnamedLocalNoLinkageFinder, bool>
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003796 {
3797 Sema &S;
3798 SourceRange SR;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003799
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003800 typedef TypeVisitor<UnnamedLocalNoLinkageFinder, bool> inherited;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003801
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003802 public:
3803 UnnamedLocalNoLinkageFinder(Sema &S, SourceRange SR) : S(S), SR(SR) { }
3804
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003805 bool Visit(QualType T) {
3806 return inherited::Visit(T.getTypePtr());
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003807 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003808
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003809#define TYPE(Class, Parent) \
3810 bool Visit##Class##Type(const Class##Type *);
3811#define ABSTRACT_TYPE(Class, Parent) \
3812 bool Visit##Class##Type(const Class##Type *) { return false; }
3813#define NON_CANONICAL_TYPE(Class, Parent) \
3814 bool Visit##Class##Type(const Class##Type *) { return false; }
3815#include "clang/AST/TypeNodes.def"
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003816
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003817 bool VisitTagDecl(const TagDecl *Tag);
3818 bool VisitNestedNameSpecifier(NestedNameSpecifier *NNS);
3819 };
3820}
3821
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003822bool UnnamedLocalNoLinkageFinder::VisitBuiltinType(const BuiltinType*) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003823 return false;
3824}
3825
3826bool UnnamedLocalNoLinkageFinder::VisitComplexType(const ComplexType* T) {
3827 return Visit(T->getElementType());
3828}
3829
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003830bool UnnamedLocalNoLinkageFinder::VisitPointerType(const PointerType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003831 return Visit(T->getPointeeType());
3832}
3833
3834bool UnnamedLocalNoLinkageFinder::VisitBlockPointerType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003835 const BlockPointerType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003836 return Visit(T->getPointeeType());
3837}
3838
3839bool UnnamedLocalNoLinkageFinder::VisitLValueReferenceType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003840 const LValueReferenceType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003841 return Visit(T->getPointeeType());
3842}
3843
3844bool UnnamedLocalNoLinkageFinder::VisitRValueReferenceType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003845 const RValueReferenceType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003846 return Visit(T->getPointeeType());
3847}
3848
3849bool UnnamedLocalNoLinkageFinder::VisitMemberPointerType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003850 const MemberPointerType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003851 return Visit(T->getPointeeType()) || Visit(QualType(T->getClass(), 0));
3852}
3853
3854bool UnnamedLocalNoLinkageFinder::VisitConstantArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003855 const ConstantArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003856 return Visit(T->getElementType());
3857}
3858
3859bool UnnamedLocalNoLinkageFinder::VisitIncompleteArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003860 const IncompleteArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003861 return Visit(T->getElementType());
3862}
3863
3864bool UnnamedLocalNoLinkageFinder::VisitVariableArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003865 const VariableArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003866 return Visit(T->getElementType());
3867}
3868
3869bool UnnamedLocalNoLinkageFinder::VisitDependentSizedArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003870 const DependentSizedArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003871 return Visit(T->getElementType());
3872}
3873
3874bool UnnamedLocalNoLinkageFinder::VisitDependentSizedExtVectorType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003875 const DependentSizedExtVectorType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003876 return Visit(T->getElementType());
3877}
3878
3879bool UnnamedLocalNoLinkageFinder::VisitVectorType(const VectorType* T) {
3880 return Visit(T->getElementType());
3881}
3882
3883bool UnnamedLocalNoLinkageFinder::VisitExtVectorType(const ExtVectorType* T) {
3884 return Visit(T->getElementType());
3885}
3886
3887bool UnnamedLocalNoLinkageFinder::VisitFunctionProtoType(
3888 const FunctionProtoType* T) {
3889 for (FunctionProtoType::arg_type_iterator A = T->arg_type_begin(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003890 AEnd = T->arg_type_end();
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003891 A != AEnd; ++A) {
3892 if (Visit(*A))
3893 return true;
3894 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003895
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003896 return Visit(T->getResultType());
3897}
3898
3899bool UnnamedLocalNoLinkageFinder::VisitFunctionNoProtoType(
3900 const FunctionNoProtoType* T) {
3901 return Visit(T->getResultType());
3902}
3903
3904bool UnnamedLocalNoLinkageFinder::VisitUnresolvedUsingType(
3905 const UnresolvedUsingType*) {
3906 return false;
3907}
3908
3909bool UnnamedLocalNoLinkageFinder::VisitTypeOfExprType(const TypeOfExprType*) {
3910 return false;
3911}
3912
3913bool UnnamedLocalNoLinkageFinder::VisitTypeOfType(const TypeOfType* T) {
3914 return Visit(T->getUnderlyingType());
3915}
3916
3917bool UnnamedLocalNoLinkageFinder::VisitDecltypeType(const DecltypeType*) {
3918 return false;
3919}
3920
Sean Huntca63c202011-05-24 22:41:36 +00003921bool UnnamedLocalNoLinkageFinder::VisitUnaryTransformType(
3922 const UnaryTransformType*) {
3923 return false;
3924}
3925
Richard Smith34b41d92011-02-20 03:19:35 +00003926bool UnnamedLocalNoLinkageFinder::VisitAutoType(const AutoType *T) {
3927 return Visit(T->getDeducedType());
3928}
3929
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003930bool UnnamedLocalNoLinkageFinder::VisitRecordType(const RecordType* T) {
3931 return VisitTagDecl(T->getDecl());
3932}
3933
3934bool UnnamedLocalNoLinkageFinder::VisitEnumType(const EnumType* T) {
3935 return VisitTagDecl(T->getDecl());
3936}
3937
3938bool UnnamedLocalNoLinkageFinder::VisitTemplateTypeParmType(
3939 const TemplateTypeParmType*) {
3940 return false;
3941}
3942
Douglas Gregorc3069d62011-01-14 02:55:32 +00003943bool UnnamedLocalNoLinkageFinder::VisitSubstTemplateTypeParmPackType(
3944 const SubstTemplateTypeParmPackType *) {
3945 return false;
3946}
3947
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003948bool UnnamedLocalNoLinkageFinder::VisitTemplateSpecializationType(
3949 const TemplateSpecializationType*) {
3950 return false;
3951}
3952
3953bool UnnamedLocalNoLinkageFinder::VisitInjectedClassNameType(
3954 const InjectedClassNameType* T) {
3955 return VisitTagDecl(T->getDecl());
3956}
3957
3958bool UnnamedLocalNoLinkageFinder::VisitDependentNameType(
3959 const DependentNameType* T) {
3960 return VisitNestedNameSpecifier(T->getQualifier());
3961}
3962
3963bool UnnamedLocalNoLinkageFinder::VisitDependentTemplateSpecializationType(
3964 const DependentTemplateSpecializationType* T) {
3965 return VisitNestedNameSpecifier(T->getQualifier());
3966}
3967
Douglas Gregor7536dd52010-12-20 02:24:11 +00003968bool UnnamedLocalNoLinkageFinder::VisitPackExpansionType(
3969 const PackExpansionType* T) {
3970 return Visit(T->getPattern());
3971}
3972
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003973bool UnnamedLocalNoLinkageFinder::VisitObjCObjectType(const ObjCObjectType *) {
3974 return false;
3975}
3976
3977bool UnnamedLocalNoLinkageFinder::VisitObjCInterfaceType(
3978 const ObjCInterfaceType *) {
3979 return false;
3980}
3981
3982bool UnnamedLocalNoLinkageFinder::VisitObjCObjectPointerType(
3983 const ObjCObjectPointerType *) {
3984 return false;
3985}
3986
Eli Friedmanb001de72011-10-06 23:00:33 +00003987bool UnnamedLocalNoLinkageFinder::VisitAtomicType(const AtomicType* T) {
3988 return Visit(T->getValueType());
3989}
3990
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003991bool UnnamedLocalNoLinkageFinder::VisitTagDecl(const TagDecl *Tag) {
3992 if (Tag->getDeclContext()->isFunctionOrMethod()) {
Richard Smithebaf0e62011-10-18 20:49:44 +00003993 S.Diag(SR.getBegin(),
Richard Smith80ad52f2013-01-02 11:42:31 +00003994 S.getLangOpts().CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00003995 diag::warn_cxx98_compat_template_arg_local_type :
3996 diag::ext_template_arg_local_type)
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003997 << S.Context.getTypeDeclType(Tag) << SR;
3998 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003999 }
4000
John McCall83972f12013-03-09 00:54:27 +00004001 if (!Tag->hasNameForLinkage()) {
Richard Smithebaf0e62011-10-18 20:49:44 +00004002 S.Diag(SR.getBegin(),
Richard Smith80ad52f2013-01-02 11:42:31 +00004003 S.getLangOpts().CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00004004 diag::warn_cxx98_compat_template_arg_unnamed_type :
4005 diag::ext_template_arg_unnamed_type) << SR;
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00004006 S.Diag(Tag->getLocation(), diag::note_template_unnamed_type_here);
4007 return true;
4008 }
4009
4010 return false;
4011}
4012
4013bool UnnamedLocalNoLinkageFinder::VisitNestedNameSpecifier(
4014 NestedNameSpecifier *NNS) {
4015 if (NNS->getPrefix() && VisitNestedNameSpecifier(NNS->getPrefix()))
4016 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004017
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00004018 switch (NNS->getKind()) {
4019 case NestedNameSpecifier::Identifier:
4020 case NestedNameSpecifier::Namespace:
Douglas Gregor14aba762011-02-24 02:36:08 +00004021 case NestedNameSpecifier::NamespaceAlias:
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00004022 case NestedNameSpecifier::Global:
4023 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004024
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00004025 case NestedNameSpecifier::TypeSpec:
4026 case NestedNameSpecifier::TypeSpecWithTemplate:
4027 return Visit(QualType(NNS->getAsType(), 0));
4028 }
David Blaikie7530c032012-01-17 06:56:22 +00004029 llvm_unreachable("Invalid NestedNameSpecifier::Kind!");
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00004030}
4031
4032
Douglas Gregorc15cb382009-02-09 23:23:08 +00004033/// \brief Check a template argument against its corresponding
4034/// template type parameter.
4035///
4036/// This routine implements the semantics of C++ [temp.arg.type]. It
4037/// returns true if an error occurred, and false otherwise.
Mike Stump1eb44332009-09-09 15:08:12 +00004038bool Sema::CheckTemplateArgument(TemplateTypeParmDecl *Param,
John McCalla93c9342009-12-07 02:54:59 +00004039 TypeSourceInfo *ArgInfo) {
4040 assert(ArgInfo && "invalid TypeSourceInfo");
John McCall833ca992009-10-29 08:12:44 +00004041 QualType Arg = ArgInfo->getType();
Douglas Gregor0fddb972010-05-22 16:17:30 +00004042 SourceRange SR = ArgInfo->getTypeLoc().getSourceRange();
Chandler Carruth17fb8552010-09-03 21:12:34 +00004043
4044 if (Arg->isVariablyModifiedType()) {
4045 return Diag(SR.getBegin(), diag::err_variably_modified_template_arg) << Arg;
Douglas Gregor4b52e252009-12-21 23:17:24 +00004046 } else if (Context.hasSameUnqualifiedType(Arg, Context.OverloadTy)) {
Douglas Gregor4b52e252009-12-21 23:17:24 +00004047 return Diag(SR.getBegin(), diag::err_template_arg_overload_type) << SR;
Douglas Gregorc15cb382009-02-09 23:23:08 +00004048 }
4049
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00004050 // C++03 [temp.arg.type]p2:
4051 // A local type, a type with no linkage, an unnamed type or a type
4052 // compounded from any of these types shall not be used as a
4053 // template-argument for a template type-parameter.
4054 //
Richard Smithebaf0e62011-10-18 20:49:44 +00004055 // C++11 allows these, and even in C++03 we allow them as an extension with
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00004056 // a warning.
Richard Smith80ad52f2013-01-02 11:42:31 +00004057 if (LangOpts.CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00004058 Diags.getDiagnosticLevel(diag::warn_cxx98_compat_template_arg_unnamed_type,
4059 SR.getBegin()) != DiagnosticsEngine::Ignored ||
4060 Diags.getDiagnosticLevel(diag::warn_cxx98_compat_template_arg_local_type,
4061 SR.getBegin()) != DiagnosticsEngine::Ignored :
4062 Arg->hasUnnamedOrLocalType()) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00004063 UnnamedLocalNoLinkageFinder Finder(*this, SR);
4064 (void)Finder.Visit(Context.getCanonicalType(Arg));
4065 }
4066
Douglas Gregorc15cb382009-02-09 23:23:08 +00004067 return false;
4068}
4069
Douglas Gregor42963612012-04-10 17:08:25 +00004070enum NullPointerValueKind {
4071 NPV_NotNullPointer,
4072 NPV_NullPointer,
4073 NPV_Error
4074};
4075
4076/// \brief Determine whether the given template argument is a null pointer
4077/// value of the appropriate type.
4078static NullPointerValueKind
4079isNullPointerValueTemplateArgument(Sema &S, NonTypeTemplateParmDecl *Param,
4080 QualType ParamType, Expr *Arg) {
4081 if (Arg->isValueDependent() || Arg->isTypeDependent())
4082 return NPV_NotNullPointer;
4083
Richard Smith80ad52f2013-01-02 11:42:31 +00004084 if (!S.getLangOpts().CPlusPlus11)
Douglas Gregor42963612012-04-10 17:08:25 +00004085 return NPV_NotNullPointer;
4086
4087 // Determine whether we have a constant expression.
Douglas Gregor50fadd12012-04-10 19:03:30 +00004088 ExprResult ArgRV = S.DefaultFunctionArrayConversion(Arg);
4089 if (ArgRV.isInvalid())
4090 return NPV_Error;
4091 Arg = ArgRV.take();
4092
Douglas Gregor42963612012-04-10 17:08:25 +00004093 Expr::EvalResult EvalResult;
Dmitri Gribenkocfa88f82013-01-12 19:30:44 +00004094 SmallVector<PartialDiagnosticAt, 8> Notes;
Douglas Gregor50fadd12012-04-10 19:03:30 +00004095 EvalResult.Diag = &Notes;
Douglas Gregor42963612012-04-10 17:08:25 +00004096 if (!Arg->EvaluateAsRValue(EvalResult, S.Context) ||
Douglas Gregor50fadd12012-04-10 19:03:30 +00004097 EvalResult.HasSideEffects) {
4098 SourceLocation DiagLoc = Arg->getExprLoc();
4099
4100 // If our only note is the usual "invalid subexpression" note, just point
4101 // the caret at its location rather than producing an essentially
4102 // redundant note.
4103 if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
4104 diag::note_invalid_subexpr_in_const_expr) {
4105 DiagLoc = Notes[0].first;
4106 Notes.clear();
4107 }
4108
4109 S.Diag(DiagLoc, diag::err_template_arg_not_address_constant)
4110 << Arg->getType() << Arg->getSourceRange();
4111 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
4112 S.Diag(Notes[I].first, Notes[I].second);
4113
4114 S.Diag(Param->getLocation(), diag::note_template_param_here);
4115 return NPV_Error;
4116 }
Douglas Gregor42963612012-04-10 17:08:25 +00004117
4118 // C++11 [temp.arg.nontype]p1:
4119 // - an address constant expression of type std::nullptr_t
4120 if (Arg->getType()->isNullPtrType())
4121 return NPV_NullPointer;
4122
4123 // - a constant expression that evaluates to a null pointer value (4.10); or
4124 // - a constant expression that evaluates to a null member pointer value
4125 // (4.11); or
4126 if ((EvalResult.Val.isLValue() && !EvalResult.Val.getLValueBase()) ||
4127 (EvalResult.Val.isMemberPointer() &&
4128 !EvalResult.Val.getMemberPointerDecl())) {
4129 // If our expression has an appropriate type, we've succeeded.
4130 bool ObjCLifetimeConversion;
4131 if (S.Context.hasSameUnqualifiedType(Arg->getType(), ParamType) ||
4132 S.IsQualificationConversion(Arg->getType(), ParamType, false,
4133 ObjCLifetimeConversion))
4134 return NPV_NullPointer;
4135
4136 // The types didn't match, but we know we got a null pointer; complain,
4137 // then recover as if the types were correct.
4138 S.Diag(Arg->getExprLoc(), diag::err_template_arg_wrongtype_null_constant)
4139 << Arg->getType() << ParamType << Arg->getSourceRange();
4140 S.Diag(Param->getLocation(), diag::note_template_param_here);
4141 return NPV_NullPointer;
4142 }
4143
4144 // If we don't have a null pointer value, but we do have a NULL pointer
4145 // constant, suggest a cast to the appropriate type.
4146 if (Arg->isNullPointerConstant(S.Context, Expr::NPC_NeverValueDependent)) {
4147 std::string Code = "static_cast<" + ParamType.getAsString() + ">(";
4148 S.Diag(Arg->getExprLoc(), diag::err_template_arg_untyped_null_constant)
4149 << ParamType
4150 << FixItHint::CreateInsertion(Arg->getLocStart(), Code)
4151 << FixItHint::CreateInsertion(S.PP.getLocForEndOfToken(Arg->getLocEnd()),
4152 ")");
4153 S.Diag(Param->getLocation(), diag::note_template_param_here);
4154 return NPV_NullPointer;
4155 }
4156
4157 // FIXME: If we ever want to support general, address-constant expressions
4158 // as non-type template arguments, we should return the ExprResult here to
4159 // be interpreted by the caller.
4160 return NPV_NotNullPointer;
4161}
4162
David Majnemerd1282ec2013-08-23 05:39:39 +00004163/// \brief Checks whether the given template argument is compatible with its
4164/// template parameter.
4165static bool CheckTemplateArgumentIsCompatibleWithParameter(
4166 Sema &S, NonTypeTemplateParmDecl *Param, QualType ParamType, Expr *ArgIn,
4167 Expr *Arg, QualType ArgType) {
4168 bool ObjCLifetimeConversion;
4169 if (ParamType->isPointerType() &&
4170 !ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType() &&
4171 S.IsQualificationConversion(ArgType, ParamType, false,
4172 ObjCLifetimeConversion)) {
4173 // For pointer-to-object types, qualification conversions are
4174 // permitted.
4175 } else {
4176 if (const ReferenceType *ParamRef = ParamType->getAs<ReferenceType>()) {
4177 if (!ParamRef->getPointeeType()->isFunctionType()) {
4178 // C++ [temp.arg.nontype]p5b3:
4179 // For a non-type template-parameter of type reference to
4180 // object, no conversions apply. The type referred to by the
4181 // reference may be more cv-qualified than the (otherwise
4182 // identical) type of the template- argument. The
4183 // template-parameter is bound directly to the
4184 // template-argument, which shall be an lvalue.
4185
4186 // FIXME: Other qualifiers?
4187 unsigned ParamQuals = ParamRef->getPointeeType().getCVRQualifiers();
4188 unsigned ArgQuals = ArgType.getCVRQualifiers();
4189
4190 if ((ParamQuals | ArgQuals) != ParamQuals) {
4191 S.Diag(Arg->getLocStart(),
4192 diag::err_template_arg_ref_bind_ignores_quals)
4193 << ParamType << Arg->getType() << Arg->getSourceRange();
4194 S.Diag(Param->getLocation(), diag::note_template_param_here);
4195 return true;
4196 }
4197 }
4198 }
4199
4200 // At this point, the template argument refers to an object or
4201 // function with external linkage. We now need to check whether the
4202 // argument and parameter types are compatible.
4203 if (!S.Context.hasSameUnqualifiedType(ArgType,
4204 ParamType.getNonReferenceType())) {
4205 // We can't perform this conversion or binding.
4206 if (ParamType->isReferenceType())
4207 S.Diag(Arg->getLocStart(), diag::err_template_arg_no_ref_bind)
4208 << ParamType << ArgIn->getType() << Arg->getSourceRange();
4209 else
4210 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_convertible)
4211 << ArgIn->getType() << ParamType << Arg->getSourceRange();
4212 S.Diag(Param->getLocation(), diag::note_template_param_here);
4213 return true;
4214 }
4215 }
4216
4217 return false;
4218}
4219
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004220/// \brief Checks whether the given template argument is the address
4221/// of an object or function according to C++ [temp.arg.nontype]p1.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004222static bool
Douglas Gregorb7a09262010-04-01 18:32:35 +00004223CheckTemplateArgumentAddressOfObjectOrFunction(Sema &S,
4224 NonTypeTemplateParmDecl *Param,
4225 QualType ParamType,
4226 Expr *ArgIn,
4227 TemplateArgument &Converted) {
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004228 bool Invalid = false;
Douglas Gregorb7a09262010-04-01 18:32:35 +00004229 Expr *Arg = ArgIn;
4230 QualType ArgType = Arg->getType();
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004231
Douglas Gregor42963612012-04-10 17:08:25 +00004232 // If our parameter has pointer type, check for a null template value.
4233 if (ParamType->isPointerType() || ParamType->isNullPtrType()) {
4234 switch (isNullPointerValueTemplateArgument(S, Param, ParamType, Arg)) {
4235 case NPV_NullPointer:
Richard Smith86e6fdc2012-04-26 01:51:03 +00004236 S.Diag(Arg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null);
Eli Friedmand7a6b162012-09-26 02:36:12 +00004237 Converted = TemplateArgument(ParamType, /*isNullPtr*/true);
Douglas Gregor42963612012-04-10 17:08:25 +00004238 return false;
4239
4240 case NPV_Error:
4241 return true;
4242
4243 case NPV_NotNullPointer:
4244 break;
4245 }
4246 }
John McCall91a57552011-07-15 05:09:51 +00004247
Douglas Gregorb7a09262010-04-01 18:32:35 +00004248 bool AddressTaken = false;
4249 SourceLocation AddrOpLoc;
David Majnemerd1282ec2013-08-23 05:39:39 +00004250 if (S.getLangOpts().MicrosoftExt) {
4251 // Microsoft Visual C++ strips all casts, allows an arbitrary number of
4252 // dereference and address-of operators.
4253 Arg = Arg->IgnoreParenCasts();
4254
4255 bool ExtWarnMSTemplateArg = false;
4256 UnaryOperatorKind FirstOpKind;
4257 SourceLocation FirstOpLoc;
4258 while (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
4259 UnaryOperatorKind UnOpKind = UnOp->getOpcode();
4260 if (UnOpKind == UO_Deref)
4261 ExtWarnMSTemplateArg = true;
4262 if (UnOpKind == UO_AddrOf || UnOpKind == UO_Deref) {
4263 Arg = UnOp->getSubExpr()->IgnoreParenCasts();
4264 if (!AddrOpLoc.isValid()) {
4265 FirstOpKind = UnOpKind;
4266 FirstOpLoc = UnOp->getOperatorLoc();
4267 }
4268 } else
4269 break;
Douglas Gregorb7a09262010-04-01 18:32:35 +00004270 }
David Majnemerd1282ec2013-08-23 05:39:39 +00004271 if (FirstOpLoc.isValid()) {
4272 if (ExtWarnMSTemplateArg)
4273 S.Diag(ArgIn->getLocStart(), diag::ext_ms_deref_template_argument)
4274 << ArgIn->getSourceRange();
John McCall91a57552011-07-15 05:09:51 +00004275
David Majnemerd1282ec2013-08-23 05:39:39 +00004276 if (FirstOpKind == UO_AddrOf)
4277 AddressTaken = true;
4278 else if (Arg->getType()->isPointerType()) {
4279 // We cannot let pointers get dereferenced here, that is obviously not a
4280 // constant expression.
4281 assert(FirstOpKind == UO_Deref);
4282 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_decl_ref)
4283 << Arg->getSourceRange();
4284 }
4285 }
4286 } else {
4287 // See through any implicit casts we added to fix the type.
4288 Arg = Arg->IgnoreImpCasts();
John McCall91a57552011-07-15 05:09:51 +00004289
David Majnemerd1282ec2013-08-23 05:39:39 +00004290 // C++ [temp.arg.nontype]p1:
4291 //
4292 // A template-argument for a non-type, non-template
4293 // template-parameter shall be one of: [...]
4294 //
4295 // -- the address of an object or function with external
4296 // linkage, including function templates and function
4297 // template-ids but excluding non-static class members,
4298 // expressed as & id-expression where the & is optional if
4299 // the name refers to a function or array, or if the
4300 // corresponding template-parameter is a reference; or
4301
4302 // In C++98/03 mode, give an extension warning on any extra parentheses.
4303 // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773
4304 bool ExtraParens = false;
4305 while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) {
4306 if (!Invalid && !ExtraParens) {
4307 S.Diag(Arg->getLocStart(),
4308 S.getLangOpts().CPlusPlus11
4309 ? diag::warn_cxx98_compat_template_arg_extra_parens
4310 : diag::ext_template_arg_extra_parens)
4311 << Arg->getSourceRange();
4312 ExtraParens = true;
4313 }
4314
4315 Arg = Parens->getSubExpr();
4316 }
4317
4318 while (SubstNonTypeTemplateParmExpr *subst =
4319 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
4320 Arg = subst->getReplacement()->IgnoreImpCasts();
4321
4322 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
4323 if (UnOp->getOpcode() == UO_AddrOf) {
4324 Arg = UnOp->getSubExpr();
4325 AddressTaken = true;
4326 AddrOpLoc = UnOp->getOperatorLoc();
4327 }
4328 }
4329
4330 while (SubstNonTypeTemplateParmExpr *subst =
4331 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
4332 Arg = subst->getReplacement()->IgnoreImpCasts();
4333 }
John McCall91a57552011-07-15 05:09:51 +00004334
Chandler Carruth038cc392010-01-31 10:01:20 +00004335 // Stop checking the precise nature of the argument if it is value dependent,
4336 // it should be checked when instantiated.
Douglas Gregorb7a09262010-04-01 18:32:35 +00004337 if (Arg->isValueDependent()) {
John McCall3fa5cae2010-10-26 07:05:15 +00004338 Converted = TemplateArgument(ArgIn);
Chandler Carruth038cc392010-01-31 10:01:20 +00004339 return false;
Douglas Gregorb7a09262010-04-01 18:32:35 +00004340 }
David Majnemerd1282ec2013-08-23 05:39:39 +00004341
4342 if (isa<CXXUuidofExpr>(Arg)) {
4343 if (CheckTemplateArgumentIsCompatibleWithParameter(S, Param, ParamType,
4344 ArgIn, Arg, ArgType))
4345 return true;
4346
4347 Converted = TemplateArgument(ArgIn);
4348 return false;
4349 }
4350
Douglas Gregord2008e22012-04-06 22:40:38 +00004351 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg);
4352 if (!DRE) {
4353 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_decl_ref)
4354 << Arg->getSourceRange();
4355 S.Diag(Param->getLocation(), diag::note_template_param_here);
4356 return true;
4357 }
Chandler Carruth038cc392010-01-31 10:01:20 +00004358
Eli Friedmand7a6b162012-09-26 02:36:12 +00004359 ValueDecl *Entity = DRE->getDecl();
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004360
4361 // Cannot refer to non-static data members
Richard Smithb4051e72012-04-04 21:11:30 +00004362 if (FieldDecl *Field = dyn_cast<FieldDecl>(Entity)) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004363 S.Diag(Arg->getLocStart(), diag::err_template_arg_field)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004364 << Field << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00004365 S.Diag(Param->getLocation(), diag::note_template_param_here);
4366 return true;
4367 }
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004368
4369 // Cannot refer to non-static member functions
Richard Smithb4051e72012-04-04 21:11:30 +00004370 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Entity)) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00004371 if (!Method->isStatic()) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004372 S.Diag(Arg->getLocStart(), diag::err_template_arg_method)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004373 << Method << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00004374 S.Diag(Param->getLocation(), diag::note_template_param_here);
4375 return true;
4376 }
Richard Smithb4051e72012-04-04 21:11:30 +00004377 }
Mike Stump1eb44332009-09-09 15:08:12 +00004378
Richard Smithb4051e72012-04-04 21:11:30 +00004379 FunctionDecl *Func = dyn_cast<FunctionDecl>(Entity);
4380 VarDecl *Var = dyn_cast<VarDecl>(Entity);
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004381
Richard Smithb4051e72012-04-04 21:11:30 +00004382 // A non-type template argument must refer to an object or function.
4383 if (!Func && !Var) {
4384 // We found something, but we don't know specifically what it is.
4385 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_object_or_func)
4386 << Arg->getSourceRange();
4387 S.Diag(DRE->getDecl()->getLocation(), diag::note_template_arg_refers_here);
4388 return true;
4389 }
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004390
Richard Smithb4051e72012-04-04 21:11:30 +00004391 // Address / reference template args must have external linkage in C++98.
Rafael Espindola181e3ec2013-05-13 00:12:11 +00004392 if (Entity->getFormalLinkage() == InternalLinkage) {
Richard Smith80ad52f2013-01-02 11:42:31 +00004393 S.Diag(Arg->getLocStart(), S.getLangOpts().CPlusPlus11 ?
Richard Smithb4051e72012-04-04 21:11:30 +00004394 diag::warn_cxx98_compat_template_arg_object_internal :
4395 diag::ext_template_arg_object_internal)
4396 << !Func << Entity << Arg->getSourceRange();
4397 S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object)
4398 << !Func;
Rafael Espindola181e3ec2013-05-13 00:12:11 +00004399 } else if (!Entity->hasLinkage()) {
Richard Smithb4051e72012-04-04 21:11:30 +00004400 S.Diag(Arg->getLocStart(), diag::err_template_arg_object_no_linkage)
4401 << !Func << Entity << Arg->getSourceRange();
4402 S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object)
4403 << !Func;
4404 return true;
4405 }
4406
4407 if (Func) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00004408 // If the template parameter has pointer type, the function decays.
4409 if (ParamType->isPointerType() && !AddressTaken)
4410 ArgType = S.Context.getPointerType(Func->getType());
4411 else if (AddressTaken && ParamType->isReferenceType()) {
4412 // If we originally had an address-of operator, but the
4413 // parameter has reference type, complain and (if things look
4414 // like they will work) drop the address-of operator.
4415 if (!S.Context.hasSameUnqualifiedType(Func->getType(),
4416 ParamType.getNonReferenceType())) {
4417 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
4418 << ParamType;
4419 S.Diag(Param->getLocation(), diag::note_template_param_here);
4420 return true;
4421 }
4422
4423 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
4424 << ParamType
4425 << FixItHint::CreateRemoval(AddrOpLoc);
4426 S.Diag(Param->getLocation(), diag::note_template_param_here);
4427
4428 ArgType = Func->getType();
4429 }
Richard Smithb4051e72012-04-04 21:11:30 +00004430 } else {
Douglas Gregorb7a09262010-04-01 18:32:35 +00004431 // A value of reference type is not an object.
4432 if (Var->getType()->isReferenceType()) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004433 S.Diag(Arg->getLocStart(),
Douglas Gregorb7a09262010-04-01 18:32:35 +00004434 diag::err_template_arg_reference_var)
4435 << Var->getType() << Arg->getSourceRange();
4436 S.Diag(Param->getLocation(), diag::note_template_param_here);
4437 return true;
4438 }
4439
Richard Smithb4051e72012-04-04 21:11:30 +00004440 // A template argument must have static storage duration.
Richard Smith38afbc72013-04-13 02:43:54 +00004441 if (Var->getTLSKind()) {
Richard Smithb4051e72012-04-04 21:11:30 +00004442 S.Diag(Arg->getLocStart(), diag::err_template_arg_thread_local)
4443 << Arg->getSourceRange();
4444 S.Diag(Var->getLocation(), diag::note_template_arg_refers_here);
4445 return true;
4446 }
Douglas Gregorb7a09262010-04-01 18:32:35 +00004447
4448 // If the template parameter has pointer type, we must have taken
4449 // the address of this object.
4450 if (ParamType->isReferenceType()) {
4451 if (AddressTaken) {
4452 // If we originally had an address-of operator, but the
4453 // parameter has reference type, complain and (if things look
4454 // like they will work) drop the address-of operator.
4455 if (!S.Context.hasSameUnqualifiedType(Var->getType(),
4456 ParamType.getNonReferenceType())) {
4457 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
4458 << ParamType;
4459 S.Diag(Param->getLocation(), diag::note_template_param_here);
4460 return true;
4461 }
4462
4463 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
4464 << ParamType
4465 << FixItHint::CreateRemoval(AddrOpLoc);
4466 S.Diag(Param->getLocation(), diag::note_template_param_here);
4467
4468 ArgType = Var->getType();
4469 }
4470 } else if (!AddressTaken && ParamType->isPointerType()) {
4471 if (Var->getType()->isArrayType()) {
4472 // Array-to-pointer decay.
4473 ArgType = S.Context.getArrayDecayedType(Var->getType());
4474 } else {
4475 // If the template parameter has pointer type but the address of
4476 // this object was not taken, complain and (possibly) recover by
4477 // taking the address of the entity.
4478 ArgType = S.Context.getPointerType(Var->getType());
4479 if (!S.Context.hasSameUnqualifiedType(ArgType, ParamType)) {
4480 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_address_of)
4481 << ParamType;
4482 S.Diag(Param->getLocation(), diag::note_template_param_here);
4483 return true;
4484 }
4485
4486 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_address_of)
4487 << ParamType
4488 << FixItHint::CreateInsertion(Arg->getLocStart(), "&");
4489
4490 S.Diag(Param->getLocation(), diag::note_template_param_here);
4491 }
4492 }
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004493 }
Mike Stump1eb44332009-09-09 15:08:12 +00004494
David Majnemerd1282ec2013-08-23 05:39:39 +00004495 if (CheckTemplateArgumentIsCompatibleWithParameter(S, Param, ParamType, ArgIn,
4496 Arg, ArgType))
4497 return true;
Douglas Gregorb7a09262010-04-01 18:32:35 +00004498
4499 // Create the template argument.
Eli Friedmand7a6b162012-09-26 02:36:12 +00004500 Converted = TemplateArgument(cast<ValueDecl>(Entity->getCanonicalDecl()),
4501 ParamType->isReferenceType());
Nick Lewyckyb7e5eec2013-02-02 00:25:55 +00004502 S.MarkAnyDeclReferenced(Arg->getLocStart(), Entity, false);
Douglas Gregorb7a09262010-04-01 18:32:35 +00004503 return false;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004504}
4505
4506/// \brief Checks whether the given template argument is a pointer to
4507/// member constant according to C++ [temp.arg.nontype]p1.
Douglas Gregor42963612012-04-10 17:08:25 +00004508static bool CheckTemplateArgumentPointerToMember(Sema &S,
4509 NonTypeTemplateParmDecl *Param,
4510 QualType ParamType,
4511 Expr *&ResultArg,
4512 TemplateArgument &Converted) {
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004513 bool Invalid = false;
4514
Douglas Gregor42963612012-04-10 17:08:25 +00004515 // Check for a null pointer value.
4516 Expr *Arg = ResultArg;
4517 switch (isNullPointerValueTemplateArgument(S, Param, ParamType, Arg)) {
4518 case NPV_Error:
4519 return true;
4520 case NPV_NullPointer:
Richard Smith86e6fdc2012-04-26 01:51:03 +00004521 S.Diag(Arg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null);
Eli Friedmand7a6b162012-09-26 02:36:12 +00004522 Converted = TemplateArgument(ParamType, /*isNullPtr*/true);
Douglas Gregor42963612012-04-10 17:08:25 +00004523 return false;
4524 case NPV_NotNullPointer:
4525 break;
4526 }
4527
4528 bool ObjCLifetimeConversion;
4529 if (S.IsQualificationConversion(Arg->getType(),
4530 ParamType.getNonReferenceType(),
4531 false, ObjCLifetimeConversion)) {
4532 Arg = S.ImpCastExprToType(Arg, ParamType, CK_NoOp,
4533 Arg->getValueKind()).take();
4534 ResultArg = Arg;
4535 } else if (!S.Context.hasSameUnqualifiedType(Arg->getType(),
4536 ParamType.getNonReferenceType())) {
4537 // We can't perform this conversion.
4538 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_convertible)
4539 << Arg->getType() << ParamType << Arg->getSourceRange();
4540 S.Diag(Param->getLocation(), diag::note_template_param_here);
4541 return true;
4542 }
4543
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004544 // See through any implicit casts we added to fix the type.
Eli Friedman73c39ab2009-10-20 08:27:19 +00004545 while (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg))
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004546 Arg = Cast->getSubExpr();
4547
4548 // C++ [temp.arg.nontype]p1:
Mike Stump1eb44332009-09-09 15:08:12 +00004549 //
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004550 // A template-argument for a non-type, non-template
4551 // template-parameter shall be one of: [...]
4552 //
4553 // -- a pointer to member expressed as described in 5.3.1.
Douglas Gregora2813ce2009-10-23 18:54:35 +00004554 DeclRefExpr *DRE = 0;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004555
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00004556 // In C++98/03 mode, give an extension warning on any extra parentheses.
4557 // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773
4558 bool ExtraParens = false;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004559 while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) {
Richard Smithebaf0e62011-10-18 20:49:44 +00004560 if (!Invalid && !ExtraParens) {
Douglas Gregor42963612012-04-10 17:08:25 +00004561 S.Diag(Arg->getLocStart(),
Richard Smith80ad52f2013-01-02 11:42:31 +00004562 S.getLangOpts().CPlusPlus11 ?
Douglas Gregor42963612012-04-10 17:08:25 +00004563 diag::warn_cxx98_compat_template_arg_extra_parens :
4564 diag::ext_template_arg_extra_parens)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004565 << Arg->getSourceRange();
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00004566 ExtraParens = true;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004567 }
4568
4569 Arg = Parens->getSubExpr();
4570 }
4571
John McCall91a57552011-07-15 05:09:51 +00004572 while (SubstNonTypeTemplateParmExpr *subst =
4573 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
4574 Arg = subst->getReplacement()->IgnoreImpCasts();
4575
Douglas Gregorcaddba02009-11-12 18:38:13 +00004576 // A pointer-to-member constant written &Class::member.
4577 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
John McCall2de56d12010-08-25 11:45:40 +00004578 if (UnOp->getOpcode() == UO_AddrOf) {
Douglas Gregora2813ce2009-10-23 18:54:35 +00004579 DRE = dyn_cast<DeclRefExpr>(UnOp->getSubExpr());
4580 if (DRE && !DRE->getQualifier())
4581 DRE = 0;
4582 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004583 }
Douglas Gregorcaddba02009-11-12 18:38:13 +00004584 // A constant of pointer-to-member type.
4585 else if ((DRE = dyn_cast<DeclRefExpr>(Arg))) {
4586 if (ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) {
4587 if (VD->getType()->isMemberPointerType()) {
4588 if (isa<NonTypeTemplateParmDecl>(VD) ||
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004589 (isa<VarDecl>(VD) &&
Douglas Gregor42963612012-04-10 17:08:25 +00004590 S.Context.getCanonicalType(VD->getType()).isConstQualified())) {
Eli Friedmand7a6b162012-09-26 02:36:12 +00004591 if (Arg->isTypeDependent() || Arg->isValueDependent()) {
John McCall3fa5cae2010-10-26 07:05:15 +00004592 Converted = TemplateArgument(Arg);
Eli Friedmand7a6b162012-09-26 02:36:12 +00004593 } else {
4594 VD = cast<ValueDecl>(VD->getCanonicalDecl());
4595 Converted = TemplateArgument(VD, /*isReferenceParam*/false);
4596 }
Douglas Gregorcaddba02009-11-12 18:38:13 +00004597 return Invalid;
4598 }
4599 }
4600 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004601
Douglas Gregorcaddba02009-11-12 18:38:13 +00004602 DRE = 0;
4603 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004604
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004605 if (!DRE)
Douglas Gregor42963612012-04-10 17:08:25 +00004606 return S.Diag(Arg->getLocStart(),
4607 diag::err_template_arg_not_pointer_to_member_form)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004608 << Arg->getSourceRange();
4609
4610 if (isa<FieldDecl>(DRE->getDecl()) || isa<CXXMethodDecl>(DRE->getDecl())) {
4611 assert((isa<FieldDecl>(DRE->getDecl()) ||
4612 !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) &&
4613 "Only non-static member pointers can make it here");
4614
4615 // Okay: this is the address of a non-static member, and therefore
4616 // a member pointer constant.
Eli Friedmand7a6b162012-09-26 02:36:12 +00004617 if (Arg->isTypeDependent() || Arg->isValueDependent()) {
John McCall3fa5cae2010-10-26 07:05:15 +00004618 Converted = TemplateArgument(Arg);
Eli Friedmand7a6b162012-09-26 02:36:12 +00004619 } else {
4620 ValueDecl *D = cast<ValueDecl>(DRE->getDecl()->getCanonicalDecl());
4621 Converted = TemplateArgument(D, /*isReferenceParam*/false);
4622 }
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004623 return Invalid;
4624 }
4625
4626 // We found something else, but we don't know specifically what it is.
Douglas Gregor42963612012-04-10 17:08:25 +00004627 S.Diag(Arg->getLocStart(),
4628 diag::err_template_arg_not_pointer_to_member_form)
4629 << Arg->getSourceRange();
4630 S.Diag(DRE->getDecl()->getLocation(), diag::note_template_arg_refers_here);
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004631 return true;
4632}
4633
Douglas Gregorc15cb382009-02-09 23:23:08 +00004634/// \brief Check a template argument against its corresponding
4635/// non-type template parameter.
4636///
Douglas Gregor2943aed2009-03-03 04:44:36 +00004637/// This routine implements the semantics of C++ [temp.arg.nontype].
John Wiegley429bb272011-04-08 18:41:53 +00004638/// If an error occurred, it returns ExprError(); otherwise, it
4639/// returns the converted template argument. \p
Douglas Gregor2943aed2009-03-03 04:44:36 +00004640/// InstantiatedParamType is the type of the non-type template
4641/// parameter after it has been instantiated.
John Wiegley429bb272011-04-08 18:41:53 +00004642ExprResult Sema::CheckTemplateArgument(NonTypeTemplateParmDecl *Param,
4643 QualType InstantiatedParamType, Expr *Arg,
4644 TemplateArgument &Converted,
4645 CheckTemplateArgumentKind CTAK) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004646 SourceLocation StartLoc = Arg->getLocStart();
Douglas Gregor40808ce2009-03-09 23:48:35 +00004647
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004648 // If either the parameter has a dependent type or the argument is
4649 // type-dependent, there's nothing we can check now.
Douglas Gregor40808ce2009-03-09 23:48:35 +00004650 if (InstantiatedParamType->isDependentType() || Arg->isTypeDependent()) {
4651 // FIXME: Produce a cloned, canonical expression?
Douglas Gregor02cbbd22009-06-11 18:10:32 +00004652 Converted = TemplateArgument(Arg);
John Wiegley429bb272011-04-08 18:41:53 +00004653 return Owned(Arg);
Douglas Gregor40808ce2009-03-09 23:48:35 +00004654 }
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004655
4656 // C++ [temp.arg.nontype]p5:
4657 // The following conversions are performed on each expression used
4658 // as a non-type template-argument. If a non-type
4659 // template-argument cannot be converted to the type of the
4660 // corresponding template-parameter then the program is
4661 // ill-formed.
Douglas Gregor2943aed2009-03-03 04:44:36 +00004662 QualType ParamType = InstantiatedParamType;
Douglas Gregor2ade35e2010-06-16 00:17:44 +00004663 if (ParamType->isIntegralOrEnumerationType()) {
Richard Smith8ef7b202012-01-18 23:55:52 +00004664 // C++11:
4665 // -- for a non-type template-parameter of integral or
4666 // enumeration type, conversions permitted in a converted
4667 // constant expression are applied.
4668 //
4669 // C++98:
4670 // -- for a non-type template-parameter of integral or
4671 // enumeration type, integral promotions (4.5) and integral
4672 // conversions (4.7) are applied.
4673
4674 if (CTAK == CTAK_Deduced &&
4675 !Context.hasSameUnqualifiedType(ParamType, Arg->getType())) {
4676 // C++ [temp.deduct.type]p17:
4677 // If, in the declaration of a function template with a non-type
4678 // template-parameter, the non-type template-parameter is used
4679 // in an expression in the function parameter-list and, if the
4680 // corresponding template-argument is deduced, the
4681 // template-argument type shall match the type of the
4682 // template-parameter exactly, except that a template-argument
4683 // deduced from an array bound may be of any integral type.
4684 Diag(StartLoc, diag::err_deduced_non_type_template_arg_type_mismatch)
4685 << Arg->getType().getUnqualifiedType()
4686 << ParamType.getUnqualifiedType();
4687 Diag(Param->getLocation(), diag::note_template_param_here);
4688 return ExprError();
4689 }
4690
Richard Smith80ad52f2013-01-02 11:42:31 +00004691 if (getLangOpts().CPlusPlus11) {
Richard Smith8ef7b202012-01-18 23:55:52 +00004692 // We can't check arbitrary value-dependent arguments.
4693 // FIXME: If there's no viable conversion to the template parameter type,
4694 // we should be able to diagnose that prior to instantiation.
4695 if (Arg->isValueDependent()) {
4696 Converted = TemplateArgument(Arg);
4697 return Owned(Arg);
4698 }
4699
4700 // C++ [temp.arg.nontype]p1:
4701 // A template-argument for a non-type, non-template template-parameter
4702 // shall be one of:
4703 //
4704 // -- for a non-type template-parameter of integral or enumeration
4705 // type, a converted constant expression of the type of the
4706 // template-parameter; or
4707 llvm::APSInt Value;
4708 ExprResult ArgResult =
4709 CheckConvertedConstantExpression(Arg, ParamType, Value,
4710 CCEK_TemplateArg);
4711 if (ArgResult.isInvalid())
4712 return ExprError();
4713
4714 // Widen the argument value to sizeof(parameter type). This is almost
4715 // always a no-op, except when the parameter type is bool. In
4716 // that case, this may extend the argument from 1 bit to 8 bits.
4717 QualType IntegerType = ParamType;
4718 if (const EnumType *Enum = IntegerType->getAs<EnumType>())
4719 IntegerType = Enum->getDecl()->getIntegerType();
4720 Value = Value.extOrTrunc(Context.getTypeSize(IntegerType));
4721
Benjamin Kramer85524372012-06-07 15:09:51 +00004722 Converted = TemplateArgument(Context, Value,
4723 Context.getCanonicalType(ParamType));
Richard Smith8ef7b202012-01-18 23:55:52 +00004724 return ArgResult;
4725 }
4726
Richard Smith4f870622011-10-27 22:11:44 +00004727 ExprResult ArgResult = DefaultLvalueConversion(Arg);
4728 if (ArgResult.isInvalid())
4729 return ExprError();
4730 Arg = ArgResult.take();
4731
4732 QualType ArgType = Arg->getType();
4733
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004734 // C++ [temp.arg.nontype]p1:
4735 // A template-argument for a non-type, non-template
4736 // template-parameter shall be one of:
4737 //
4738 // -- an integral constant-expression of integral or enumeration
4739 // type; or
4740 // -- the name of a non-type template-parameter; or
4741 SourceLocation NonConstantLoc;
Douglas Gregor3e00bad2009-02-17 01:05:43 +00004742 llvm::APSInt Value;
Douglas Gregor2ade35e2010-06-16 00:17:44 +00004743 if (!ArgType->isIntegralOrEnumerationType()) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004744 Diag(Arg->getLocStart(),
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004745 diag::err_template_arg_not_integral_or_enumeral)
4746 << ArgType << Arg->getSourceRange();
4747 Diag(Param->getLocation(), diag::note_template_param_here);
John Wiegley429bb272011-04-08 18:41:53 +00004748 return ExprError();
Richard Smith282e7e62012-02-04 09:53:13 +00004749 } else if (!Arg->isValueDependent()) {
Douglas Gregorab41fe92012-05-04 22:38:52 +00004750 class TmplArgICEDiagnoser : public VerifyICEDiagnoser {
4751 QualType T;
4752
4753 public:
4754 TmplArgICEDiagnoser(QualType T) : T(T) { }
4755
4756 virtual void diagnoseNotICE(Sema &S, SourceLocation Loc,
4757 SourceRange SR) {
4758 S.Diag(Loc, diag::err_template_arg_not_ice) << T << SR;
4759 }
4760 } Diagnoser(ArgType);
4761
4762 Arg = VerifyIntegerConstantExpression(Arg, &Value, Diagnoser,
4763 false).take();
Richard Smith282e7e62012-02-04 09:53:13 +00004764 if (!Arg)
4765 return ExprError();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004766 }
4767
Douglas Gregor02024a92010-03-28 02:42:43 +00004768 // From here on out, all we care about are the unqualified forms
4769 // of the parameter and argument types.
4770 ParamType = ParamType.getUnqualifiedType();
4771 ArgType = ArgType.getUnqualifiedType();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004772
4773 // Try to convert the argument to the parameter's type.
Douglas Gregorff524392009-11-04 21:50:46 +00004774 if (Context.hasSameType(ParamType, ArgType)) {
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004775 // Okay: no conversion necessary
John McCalldaa8e4e2010-11-15 09:13:47 +00004776 } else if (ParamType->isBooleanType()) {
4777 // This is an integral-to-boolean conversion.
John Wiegley429bb272011-04-08 18:41:53 +00004778 Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralToBoolean).take();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004779 } else if (IsIntegralPromotion(Arg, ArgType, ParamType) ||
4780 !ParamType->isEnumeralType()) {
4781 // This is an integral promotion or conversion.
John Wiegley429bb272011-04-08 18:41:53 +00004782 Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralCast).take();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004783 } else {
4784 // We can't perform this conversion.
Daniel Dunbar96a00142012-03-09 18:35:03 +00004785 Diag(Arg->getLocStart(),
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004786 diag::err_template_arg_not_convertible)
Douglas Gregor2943aed2009-03-03 04:44:36 +00004787 << Arg->getType() << InstantiatedParamType << Arg->getSourceRange();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004788 Diag(Param->getLocation(), diag::note_template_param_here);
John Wiegley429bb272011-04-08 18:41:53 +00004789 return ExprError();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004790 }
4791
Douglas Gregorc7469372011-05-04 21:55:00 +00004792 // Add the value of this argument to the list of converted
4793 // arguments. We use the bitwidth and signedness of the template
4794 // parameter.
4795 if (Arg->isValueDependent()) {
4796 // The argument is value-dependent. Create a new
4797 // TemplateArgument with the converted expression.
4798 Converted = TemplateArgument(Arg);
4799 return Owned(Arg);
4800 }
4801
Douglas Gregorf80a9d52009-03-14 00:20:21 +00004802 QualType IntegerType = Context.getCanonicalType(ParamType);
John McCall183700f2009-09-21 23:43:11 +00004803 if (const EnumType *Enum = IntegerType->getAs<EnumType>())
Douglas Gregor02cbbd22009-06-11 18:10:32 +00004804 IntegerType = Context.getCanonicalType(Enum->getDecl()->getIntegerType());
Douglas Gregorf80a9d52009-03-14 00:20:21 +00004805
Douglas Gregorc7469372011-05-04 21:55:00 +00004806 if (ParamType->isBooleanType()) {
4807 // Value must be zero or one.
4808 Value = Value != 0;
4809 unsigned AllowedBits = Context.getTypeSize(IntegerType);
4810 if (Value.getBitWidth() != AllowedBits)
4811 Value = Value.extOrTrunc(AllowedBits);
Douglas Gregor575a1c92011-05-20 16:38:50 +00004812 Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType());
Douglas Gregorc7469372011-05-04 21:55:00 +00004813 } else {
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004814 llvm::APSInt OldValue = Value;
Douglas Gregorc7469372011-05-04 21:55:00 +00004815
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004816 // Coerce the template argument's value to the value it will have
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004817 // based on the template parameter's type.
Douglas Gregor0d4fd8e2010-03-26 00:39:40 +00004818 unsigned AllowedBits = Context.getTypeSize(IntegerType);
Douglas Gregor0d4fd8e2010-03-26 00:39:40 +00004819 if (Value.getBitWidth() != AllowedBits)
Jay Foad9f71a8f2010-12-07 08:25:34 +00004820 Value = Value.extOrTrunc(AllowedBits);
Douglas Gregor575a1c92011-05-20 16:38:50 +00004821 Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType());
Douglas Gregorc7469372011-05-04 21:55:00 +00004822
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004823 // Complain if an unsigned parameter received a negative value.
Douglas Gregor575a1c92011-05-20 16:38:50 +00004824 if (IntegerType->isUnsignedIntegerOrEnumerationType()
Douglas Gregorc7469372011-05-04 21:55:00 +00004825 && (OldValue.isSigned() && OldValue.isNegative())) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004826 Diag(Arg->getLocStart(), diag::warn_template_arg_negative)
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004827 << OldValue.toString(10) << Value.toString(10) << Param->getType()
4828 << Arg->getSourceRange();
4829 Diag(Param->getLocation(), diag::note_template_param_here);
4830 }
Douglas Gregorc7469372011-05-04 21:55:00 +00004831
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004832 // Complain if we overflowed the template parameter's type.
4833 unsigned RequiredBits;
Douglas Gregor575a1c92011-05-20 16:38:50 +00004834 if (IntegerType->isUnsignedIntegerOrEnumerationType())
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004835 RequiredBits = OldValue.getActiveBits();
4836 else if (OldValue.isUnsigned())
4837 RequiredBits = OldValue.getActiveBits() + 1;
4838 else
4839 RequiredBits = OldValue.getMinSignedBits();
4840 if (RequiredBits > AllowedBits) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004841 Diag(Arg->getLocStart(),
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004842 diag::warn_template_arg_too_large)
4843 << OldValue.toString(10) << Value.toString(10) << Param->getType()
4844 << Arg->getSourceRange();
4845 Diag(Param->getLocation(), diag::note_template_param_here);
4846 }
Douglas Gregorf80a9d52009-03-14 00:20:21 +00004847 }
Douglas Gregor3e00bad2009-02-17 01:05:43 +00004848
Benjamin Kramer85524372012-06-07 15:09:51 +00004849 Converted = TemplateArgument(Context, Value,
Douglas Gregor6b63f552011-08-09 01:55:14 +00004850 ParamType->isEnumeralType()
4851 ? Context.getCanonicalType(ParamType)
4852 : IntegerType);
John Wiegley429bb272011-04-08 18:41:53 +00004853 return Owned(Arg);
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004854 }
Douglas Gregora35284b2009-02-11 00:19:33 +00004855
Richard Smith4f870622011-10-27 22:11:44 +00004856 QualType ArgType = Arg->getType();
John McCall6bb80172010-03-30 21:47:33 +00004857 DeclAccessPair FoundResult; // temporary for ResolveOverloadedFunction
4858
Douglas Gregorb86b0572009-02-11 01:18:59 +00004859 // Handle pointer-to-function, reference-to-function, and
4860 // pointer-to-member-function all in (roughly) the same way.
4861 if (// -- For a non-type template-parameter of type pointer to
4862 // function, only the function-to-pointer conversion (4.3) is
4863 // applied. If the template-argument represents a set of
4864 // overloaded functions (or a pointer to such), the matching
4865 // function is selected from the set (13.4).
4866 (ParamType->isPointerType() &&
Ted Kremenek6217b802009-07-29 21:53:49 +00004867 ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType()) ||
Douglas Gregorb86b0572009-02-11 01:18:59 +00004868 // -- For a non-type template-parameter of type reference to
4869 // function, no conversions apply. If the template-argument
4870 // represents a set of overloaded functions, the matching
4871 // function is selected from the set (13.4).
4872 (ParamType->isReferenceType() &&
Ted Kremenek6217b802009-07-29 21:53:49 +00004873 ParamType->getAs<ReferenceType>()->getPointeeType()->isFunctionType()) ||
Douglas Gregorb86b0572009-02-11 01:18:59 +00004874 // -- For a non-type template-parameter of type pointer to
4875 // member function, no conversions apply. If the
4876 // template-argument represents a set of overloaded member
4877 // functions, the matching member function is selected from
4878 // the set (13.4).
4879 (ParamType->isMemberPointerType() &&
Ted Kremenek6217b802009-07-29 21:53:49 +00004880 ParamType->getAs<MemberPointerType>()->getPointeeType()
Douglas Gregorb86b0572009-02-11 01:18:59 +00004881 ->isFunctionType())) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00004882
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004883 if (Arg->getType() == Context.OverloadTy) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004884 if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg, ParamType,
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004885 true,
4886 FoundResult)) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004887 if (DiagnoseUseOfDecl(Fn, Arg->getLocStart()))
John Wiegley429bb272011-04-08 18:41:53 +00004888 return ExprError();
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004889
4890 Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn);
4891 ArgType = Arg->getType();
4892 } else
John Wiegley429bb272011-04-08 18:41:53 +00004893 return ExprError();
Douglas Gregora35284b2009-02-11 00:19:33 +00004894 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004895
John Wiegley429bb272011-04-08 18:41:53 +00004896 if (!ParamType->isMemberPointerType()) {
4897 if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param,
4898 ParamType,
4899 Arg, Converted))
4900 return ExprError();
4901 return Owned(Arg);
4902 }
Douglas Gregorb7a09262010-04-01 18:32:35 +00004903
Douglas Gregor42963612012-04-10 17:08:25 +00004904 if (CheckTemplateArgumentPointerToMember(*this, Param, ParamType, Arg,
4905 Converted))
John Wiegley429bb272011-04-08 18:41:53 +00004906 return ExprError();
4907 return Owned(Arg);
Douglas Gregora35284b2009-02-11 00:19:33 +00004908 }
4909
Chris Lattnerfe90de72009-02-20 21:37:53 +00004910 if (ParamType->isPointerType()) {
Douglas Gregorb86b0572009-02-11 01:18:59 +00004911 // -- for a non-type template-parameter of type pointer to
4912 // object, qualification conversions (4.4) and the
4913 // array-to-pointer conversion (4.2) are applied.
Sebastian Redl6e8ed162009-05-10 18:38:11 +00004914 // C++0x also allows a value of std::nullptr_t.
Eli Friedman13578692010-08-05 02:49:48 +00004915 assert(ParamType->getPointeeType()->isIncompleteOrObjectType() &&
Douglas Gregorb86b0572009-02-11 01:18:59 +00004916 "Only object pointers allowed here");
Douglas Gregorf684e6e2009-02-11 00:44:29 +00004917
John Wiegley429bb272011-04-08 18:41:53 +00004918 if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param,
4919 ParamType,
4920 Arg, Converted))
4921 return ExprError();
4922 return Owned(Arg);
Douglas Gregorf684e6e2009-02-11 00:44:29 +00004923 }
Mike Stump1eb44332009-09-09 15:08:12 +00004924
Ted Kremenek6217b802009-07-29 21:53:49 +00004925 if (const ReferenceType *ParamRefType = ParamType->getAs<ReferenceType>()) {
Douglas Gregorb86b0572009-02-11 01:18:59 +00004926 // -- For a non-type template-parameter of type reference to
4927 // object, no conversions apply. The type referred to by the
4928 // reference may be more cv-qualified than the (otherwise
4929 // identical) type of the template-argument. The
4930 // template-parameter is bound directly to the
4931 // template-argument, which must be an lvalue.
Eli Friedman13578692010-08-05 02:49:48 +00004932 assert(ParamRefType->getPointeeType()->isIncompleteOrObjectType() &&
Douglas Gregorb86b0572009-02-11 01:18:59 +00004933 "Only object references allowed here");
Douglas Gregorf684e6e2009-02-11 00:44:29 +00004934
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004935 if (Arg->getType() == Context.OverloadTy) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004936 if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg,
4937 ParamRefType->getPointeeType(),
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004938 true,
4939 FoundResult)) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004940 if (DiagnoseUseOfDecl(Fn, Arg->getLocStart()))
John Wiegley429bb272011-04-08 18:41:53 +00004941 return ExprError();
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004942
4943 Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn);
4944 ArgType = Arg->getType();
4945 } else
John Wiegley429bb272011-04-08 18:41:53 +00004946 return ExprError();
Douglas Gregorb86b0572009-02-11 01:18:59 +00004947 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004948
John Wiegley429bb272011-04-08 18:41:53 +00004949 if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param,
4950 ParamType,
4951 Arg, Converted))
4952 return ExprError();
4953 return Owned(Arg);
Douglas Gregorb86b0572009-02-11 01:18:59 +00004954 }
Douglas Gregor658bbb52009-02-11 16:16:59 +00004955
Douglas Gregor42963612012-04-10 17:08:25 +00004956 // Deal with parameters of type std::nullptr_t.
4957 if (ParamType->isNullPtrType()) {
4958 if (Arg->isTypeDependent() || Arg->isValueDependent()) {
4959 Converted = TemplateArgument(Arg);
4960 return Owned(Arg);
4961 }
4962
4963 switch (isNullPointerValueTemplateArgument(*this, Param, ParamType, Arg)) {
4964 case NPV_NotNullPointer:
4965 Diag(Arg->getExprLoc(), diag::err_template_arg_not_convertible)
4966 << Arg->getType() << ParamType;
4967 Diag(Param->getLocation(), diag::note_template_param_here);
4968 return ExprError();
4969
4970 case NPV_Error:
4971 return ExprError();
4972
4973 case NPV_NullPointer:
Richard Smith86e6fdc2012-04-26 01:51:03 +00004974 Diag(Arg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null);
Eli Friedmand7a6b162012-09-26 02:36:12 +00004975 Converted = TemplateArgument(ParamType, /*isNullPtr*/true);
Dmitri Gribenko1ad23d62012-09-10 21:20:09 +00004976 return Owned(Arg);
Douglas Gregor42963612012-04-10 17:08:25 +00004977 }
4978 }
4979
Douglas Gregor658bbb52009-02-11 16:16:59 +00004980 // -- For a non-type template-parameter of type pointer to data
4981 // member, qualification conversions (4.4) are applied.
4982 assert(ParamType->isMemberPointerType() && "Only pointers to members remain");
4983
Douglas Gregor42963612012-04-10 17:08:25 +00004984 if (CheckTemplateArgumentPointerToMember(*this, Param, ParamType, Arg,
4985 Converted))
John Wiegley429bb272011-04-08 18:41:53 +00004986 return ExprError();
4987 return Owned(Arg);
Douglas Gregorc15cb382009-02-09 23:23:08 +00004988}
4989
4990/// \brief Check a template argument against its corresponding
4991/// template template parameter.
4992///
4993/// This routine implements the semantics of C++ [temp.arg.template].
4994/// It returns true if an error occurred, and false otherwise.
4995bool Sema::CheckTemplateArgument(TemplateTemplateParmDecl *Param,
Richard Smith6964b3f2012-09-07 02:06:42 +00004996 const TemplateArgumentLoc &Arg,
4997 unsigned ArgumentPackIndex) {
Eli Friedmand7a6b162012-09-26 02:36:12 +00004998 TemplateName Name = Arg.getArgument().getAsTemplateOrTemplatePattern();
Douglas Gregor788cd062009-11-11 01:00:40 +00004999 TemplateDecl *Template = Name.getAsTemplateDecl();
5000 if (!Template) {
5001 // Any dependent template name is fine.
5002 assert(Name.isDependent() && "Non-dependent template isn't a declaration?");
5003 return false;
5004 }
Douglas Gregordd0574e2009-02-10 00:24:35 +00005005
Richard Smith3e4c6c42011-05-05 21:57:07 +00005006 // C++0x [temp.arg.template]p1:
Douglas Gregordd0574e2009-02-10 00:24:35 +00005007 // A template-argument for a template template-parameter shall be
Richard Smith3e4c6c42011-05-05 21:57:07 +00005008 // the name of a class template or an alias template, expressed as an
5009 // id-expression. When the template-argument names a class template, only
Douglas Gregordd0574e2009-02-10 00:24:35 +00005010 // primary class templates are considered when matching the
5011 // template template argument with the corresponding parameter;
5012 // partial specializations are not considered even if their
5013 // parameter lists match that of the template template parameter.
Douglas Gregorba1ecb52009-06-12 19:43:02 +00005014 //
5015 // Note that we also allow template template parameters here, which
5016 // will happen when we are dealing with, e.g., class template
5017 // partial specializations.
Mike Stump1eb44332009-09-09 15:08:12 +00005018 if (!isa<ClassTemplateDecl>(Template) &&
Richard Smith3e4c6c42011-05-05 21:57:07 +00005019 !isa<TemplateTemplateParmDecl>(Template) &&
5020 !isa<TypeAliasTemplateDecl>(Template)) {
Mike Stump1eb44332009-09-09 15:08:12 +00005021 assert(isa<FunctionTemplateDecl>(Template) &&
Douglas Gregordd0574e2009-02-10 00:24:35 +00005022 "Only function templates are possible here");
Douglas Gregor788cd062009-11-11 01:00:40 +00005023 Diag(Arg.getLocation(), diag::err_template_arg_not_class_template);
Douglas Gregore53060f2009-06-25 22:08:12 +00005024 Diag(Template->getLocation(), diag::note_template_arg_refers_here_func)
Douglas Gregordd0574e2009-02-10 00:24:35 +00005025 << Template;
5026 }
5027
Richard Smith6964b3f2012-09-07 02:06:42 +00005028 TemplateParameterList *Params = Param->getTemplateParameters();
5029 if (Param->isExpandedParameterPack())
5030 Params = Param->getExpansionTemplateParameters(ArgumentPackIndex);
5031
Douglas Gregordd0574e2009-02-10 00:24:35 +00005032 return !TemplateParameterListsAreEqual(Template->getTemplateParameters(),
Richard Smith6964b3f2012-09-07 02:06:42 +00005033 Params,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005034 true,
Douglas Gregorfb898e12009-11-12 16:20:59 +00005035 TPL_TemplateTemplateArgumentMatch,
Douglas Gregor788cd062009-11-11 01:00:40 +00005036 Arg.getLocation());
Douglas Gregorc15cb382009-02-09 23:23:08 +00005037}
5038
Douglas Gregor02024a92010-03-28 02:42:43 +00005039/// \brief Given a non-type template argument that refers to a
5040/// declaration and the type of its corresponding non-type template
5041/// parameter, produce an expression that properly refers to that
5042/// declaration.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005043ExprResult
Douglas Gregor02024a92010-03-28 02:42:43 +00005044Sema::BuildExpressionFromDeclTemplateArgument(const TemplateArgument &Arg,
5045 QualType ParamType,
5046 SourceLocation Loc) {
David Blaikiec0cedbe2013-02-27 22:10:40 +00005047 // C++ [temp.param]p8:
5048 //
5049 // A non-type template-parameter of type "array of T" or
5050 // "function returning T" is adjusted to be of type "pointer to
5051 // T" or "pointer to function returning T", respectively.
5052 if (ParamType->isArrayType())
5053 ParamType = Context.getArrayDecayedType(ParamType);
5054 else if (ParamType->isFunctionType())
5055 ParamType = Context.getPointerType(ParamType);
5056
Douglas Gregord2008e22012-04-06 22:40:38 +00005057 // For a NULL non-type template argument, return nullptr casted to the
5058 // parameter's type.
Eli Friedmand7a6b162012-09-26 02:36:12 +00005059 if (Arg.getKind() == TemplateArgument::NullPtr) {
Douglas Gregord2008e22012-04-06 22:40:38 +00005060 return ImpCastExprToType(
5061 new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc),
5062 ParamType,
5063 ParamType->getAs<MemberPointerType>()
5064 ? CK_NullToMemberPointer
5065 : CK_NullToPointer);
5066 }
Eli Friedmand7a6b162012-09-26 02:36:12 +00005067 assert(Arg.getKind() == TemplateArgument::Declaration &&
5068 "Only declaration template arguments permitted here");
5069
Douglas Gregor02024a92010-03-28 02:42:43 +00005070 ValueDecl *VD = cast<ValueDecl>(Arg.getAsDecl());
5071
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005072 if (VD->getDeclContext()->isRecord() &&
Douglas Gregor02024a92010-03-28 02:42:43 +00005073 (isa<CXXMethodDecl>(VD) || isa<FieldDecl>(VD))) {
5074 // If the value is a class member, we might have a pointer-to-member.
5075 // Determine whether the non-type template template parameter is of
5076 // pointer-to-member type. If so, we need to build an appropriate
5077 // expression for a pointer-to-member, since a "normal" DeclRefExpr
5078 // would refer to the member itself.
5079 if (ParamType->isMemberPointerType()) {
5080 QualType ClassType
5081 = Context.getTypeDeclType(cast<RecordDecl>(VD->getDeclContext()));
5082 NestedNameSpecifier *Qualifier
John McCall9ae2f072010-08-23 23:25:46 +00005083 = NestedNameSpecifier::Create(Context, 0, false,
5084 ClassType.getTypePtr());
Douglas Gregor02024a92010-03-28 02:42:43 +00005085 CXXScopeSpec SS;
Douglas Gregorc34348a2011-02-24 17:54:50 +00005086 SS.MakeTrivial(Context, Qualifier, Loc);
John McCalldfa1edb2010-11-23 20:48:44 +00005087
5088 // The actual value-ness of this is unimportant, but for
5089 // internal consistency's sake, references to instance methods
5090 // are r-values.
5091 ExprValueKind VK = VK_LValue;
5092 if (isa<CXXMethodDecl>(VD) && cast<CXXMethodDecl>(VD)->isInstance())
5093 VK = VK_RValue;
5094
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005095 ExprResult RefExpr = BuildDeclRefExpr(VD,
John McCallf89e55a2010-11-18 06:31:45 +00005096 VD->getType().getNonReferenceType(),
John McCalldfa1edb2010-11-23 20:48:44 +00005097 VK,
John McCallf89e55a2010-11-18 06:31:45 +00005098 Loc,
5099 &SS);
Douglas Gregor02024a92010-03-28 02:42:43 +00005100 if (RefExpr.isInvalid())
5101 return ExprError();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005102
John McCall2de56d12010-08-25 11:45:40 +00005103 RefExpr = CreateBuiltinUnaryOp(Loc, UO_AddrOf, RefExpr.get());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005104
Douglas Gregorc0c83002010-04-30 21:46:38 +00005105 // We might need to perform a trailing qualification conversion, since
5106 // the element type on the parameter could be more qualified than the
5107 // element type in the expression we constructed.
John McCallf85e1932011-06-15 23:02:42 +00005108 bool ObjCLifetimeConversion;
Douglas Gregorc0c83002010-04-30 21:46:38 +00005109 if (IsQualificationConversion(((Expr*) RefExpr.get())->getType(),
John McCallf85e1932011-06-15 23:02:42 +00005110 ParamType.getUnqualifiedType(), false,
5111 ObjCLifetimeConversion))
John Wiegley429bb272011-04-08 18:41:53 +00005112 RefExpr = ImpCastExprToType(RefExpr.take(), ParamType.getUnqualifiedType(), CK_NoOp);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005113
Douglas Gregor02024a92010-03-28 02:42:43 +00005114 assert(!RefExpr.isInvalid() &&
5115 Context.hasSameType(((Expr*) RefExpr.get())->getType(),
Douglas Gregorc0c83002010-04-30 21:46:38 +00005116 ParamType.getUnqualifiedType()));
Benjamin Kramer3fe198b2012-08-23 21:35:17 +00005117 return RefExpr;
Douglas Gregor02024a92010-03-28 02:42:43 +00005118 }
5119 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005120
Douglas Gregor02024a92010-03-28 02:42:43 +00005121 QualType T = VD->getType().getNonReferenceType();
Douglas Gregorb9df75f2013-01-16 00:52:15 +00005122
Douglas Gregor02024a92010-03-28 02:42:43 +00005123 if (ParamType->isPointerType()) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00005124 // When the non-type template parameter is a pointer, take the
5125 // address of the declaration.
John McCallf89e55a2010-11-18 06:31:45 +00005126 ExprResult RefExpr = BuildDeclRefExpr(VD, T, VK_LValue, Loc);
Douglas Gregor02024a92010-03-28 02:42:43 +00005127 if (RefExpr.isInvalid())
5128 return ExprError();
Douglas Gregorb7a09262010-04-01 18:32:35 +00005129
5130 if (T->isFunctionType() || T->isArrayType()) {
5131 // Decay functions and arrays.
John Wiegley429bb272011-04-08 18:41:53 +00005132 RefExpr = DefaultFunctionArrayConversion(RefExpr.take());
5133 if (RefExpr.isInvalid())
5134 return ExprError();
Douglas Gregorb7a09262010-04-01 18:32:35 +00005135
Benjamin Kramer3fe198b2012-08-23 21:35:17 +00005136 return RefExpr;
Douglas Gregor02024a92010-03-28 02:42:43 +00005137 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005138
Douglas Gregorb7a09262010-04-01 18:32:35 +00005139 // Take the address of everything else
John McCall2de56d12010-08-25 11:45:40 +00005140 return CreateBuiltinUnaryOp(Loc, UO_AddrOf, RefExpr.get());
Douglas Gregor02024a92010-03-28 02:42:43 +00005141 }
5142
John McCallf89e55a2010-11-18 06:31:45 +00005143 ExprValueKind VK = VK_RValue;
5144
Douglas Gregor02024a92010-03-28 02:42:43 +00005145 // If the non-type template parameter has reference type, qualify the
5146 // resulting declaration reference with the extra qualifiers on the
5147 // type that the reference refers to.
John McCallf89e55a2010-11-18 06:31:45 +00005148 if (const ReferenceType *TargetRef = ParamType->getAs<ReferenceType>()) {
5149 VK = VK_LValue;
5150 T = Context.getQualifiedType(T,
5151 TargetRef->getPointeeType().getQualifiers());
Douglas Gregorb9df75f2013-01-16 00:52:15 +00005152 } else if (isa<FunctionDecl>(VD)) {
5153 // References to functions are always lvalues.
5154 VK = VK_LValue;
John McCallf89e55a2010-11-18 06:31:45 +00005155 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005156
John McCallf89e55a2010-11-18 06:31:45 +00005157 return BuildDeclRefExpr(VD, T, VK, Loc);
Douglas Gregor02024a92010-03-28 02:42:43 +00005158}
5159
5160/// \brief Construct a new expression that refers to the given
5161/// integral template argument with the given source-location
5162/// information.
5163///
5164/// This routine takes care of the mapping from an integral template
5165/// argument (which may have any integral type) to the appropriate
5166/// literal value.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005167ExprResult
Douglas Gregor02024a92010-03-28 02:42:43 +00005168Sema::BuildExpressionFromIntegralTemplateArgument(const TemplateArgument &Arg,
5169 SourceLocation Loc) {
5170 assert(Arg.getKind() == TemplateArgument::Integral &&
Douglas Gregord3731192011-01-10 07:32:04 +00005171 "Operation is only valid for integral template arguments");
Benjamin Kramer39ad0f02012-11-21 17:42:47 +00005172 QualType OrigT = Arg.getIntegralType();
5173
5174 // If this is an enum type that we're instantiating, we need to use an integer
5175 // type the same size as the enumerator. We don't want to build an
5176 // IntegerLiteral with enum type. The integer type of an enum type can be of
5177 // any integral type with C++11 enum classes, make sure we create the right
5178 // type of literal for it.
5179 QualType T = OrigT;
5180 if (const EnumType *ET = OrigT->getAs<EnumType>())
5181 T = ET->getDecl()->getIntegerType();
5182
5183 Expr *E;
Douglas Gregor5cee1192011-07-27 05:40:30 +00005184 if (T->isAnyCharacterType()) {
5185 CharacterLiteral::CharacterKind Kind;
5186 if (T->isWideCharType())
5187 Kind = CharacterLiteral::Wide;
5188 else if (T->isChar16Type())
5189 Kind = CharacterLiteral::UTF16;
5190 else if (T->isChar32Type())
5191 Kind = CharacterLiteral::UTF32;
5192 else
5193 Kind = CharacterLiteral::Ascii;
5194
Benjamin Kramer39ad0f02012-11-21 17:42:47 +00005195 E = new (Context) CharacterLiteral(Arg.getAsIntegral().getZExtValue(),
5196 Kind, T, Loc);
5197 } else if (T->isBooleanType()) {
5198 E = new (Context) CXXBoolLiteralExpr(Arg.getAsIntegral().getBoolValue(),
5199 T, Loc);
5200 } else if (T->isNullPtrType()) {
5201 E = new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc);
5202 } else {
5203 E = IntegerLiteral::Create(Context, Arg.getAsIntegral(), T, Loc);
Douglas Gregor5cee1192011-07-27 05:40:30 +00005204 }
5205
Benjamin Kramer39ad0f02012-11-21 17:42:47 +00005206 if (OrigT->isEnumeralType()) {
John McCall4e9272d2011-07-15 07:47:58 +00005207 // FIXME: This is a hack. We need a better way to handle substituted
5208 // non-type template parameters.
Benjamin Kramer39ad0f02012-11-21 17:42:47 +00005209 E = CStyleCastExpr::Create(Context, OrigT, VK_RValue, CK_IntegralCast, E, 0,
5210 Context.getTrivialTypeSourceInfo(OrigT, Loc),
John McCall4e9272d2011-07-15 07:47:58 +00005211 Loc, Loc);
5212 }
5213
5214 return Owned(E);
Douglas Gregor02024a92010-03-28 02:42:43 +00005215}
5216
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005217/// \brief Match two template parameters within template parameter lists.
5218static bool MatchTemplateParameterKind(Sema &S, NamedDecl *New, NamedDecl *Old,
5219 bool Complain,
5220 Sema::TemplateParameterListEqualKind Kind,
5221 SourceLocation TemplateArgLoc) {
5222 // Check the actual kind (type, non-type, template).
5223 if (Old->getKind() != New->getKind()) {
5224 if (Complain) {
5225 unsigned NextDiag = diag::err_template_param_different_kind;
5226 if (TemplateArgLoc.isValid()) {
5227 S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch);
5228 NextDiag = diag::note_template_param_different_kind;
5229 }
5230 S.Diag(New->getLocation(), NextDiag)
5231 << (Kind != Sema::TPL_TemplateMatch);
5232 S.Diag(Old->getLocation(), diag::note_template_prev_declaration)
5233 << (Kind != Sema::TPL_TemplateMatch);
5234 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005235
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005236 return false;
5237 }
5238
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005239 // Check that both are parameter packs are neither are parameter packs.
5240 // However, if we are matching a template template argument to a
Douglas Gregora0347822011-01-13 00:08:50 +00005241 // template template parameter, the template template parameter can have
5242 // a parameter pack where the template template argument does not.
5243 if (Old->isTemplateParameterPack() != New->isTemplateParameterPack() &&
5244 !(Kind == Sema::TPL_TemplateTemplateArgumentMatch &&
5245 Old->isTemplateParameterPack())) {
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005246 if (Complain) {
5247 unsigned NextDiag = diag::err_template_parameter_pack_non_pack;
5248 if (TemplateArgLoc.isValid()) {
5249 S.Diag(TemplateArgLoc,
5250 diag::err_template_arg_template_params_mismatch);
5251 NextDiag = diag::note_template_parameter_pack_non_pack;
5252 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005253
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005254 unsigned ParamKind = isa<TemplateTypeParmDecl>(New)? 0
5255 : isa<NonTypeTemplateParmDecl>(New)? 1
5256 : 2;
5257 S.Diag(New->getLocation(), NextDiag)
5258 << ParamKind << New->isParameterPack();
5259 S.Diag(Old->getLocation(), diag::note_template_parameter_pack_here)
5260 << ParamKind << Old->isParameterPack();
5261 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005262
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005263 return false;
5264 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005265
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005266 // For non-type template parameters, check the type of the parameter.
5267 if (NonTypeTemplateParmDecl *OldNTTP
5268 = dyn_cast<NonTypeTemplateParmDecl>(Old)) {
5269 NonTypeTemplateParmDecl *NewNTTP = cast<NonTypeTemplateParmDecl>(New);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005270
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005271 // If we are matching a template template argument to a template
5272 // template parameter and one of the non-type template parameter types
5273 // is dependent, then we must wait until template instantiation time
5274 // to actually compare the arguments.
5275 if (Kind == Sema::TPL_TemplateTemplateArgumentMatch &&
5276 (OldNTTP->getType()->isDependentType() ||
5277 NewNTTP->getType()->isDependentType()))
5278 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005279
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005280 if (!S.Context.hasSameType(OldNTTP->getType(), NewNTTP->getType())) {
5281 if (Complain) {
5282 unsigned NextDiag = diag::err_template_nontype_parm_different_type;
5283 if (TemplateArgLoc.isValid()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005284 S.Diag(TemplateArgLoc,
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005285 diag::err_template_arg_template_params_mismatch);
5286 NextDiag = diag::note_template_nontype_parm_different_type;
5287 }
5288 S.Diag(NewNTTP->getLocation(), NextDiag)
5289 << NewNTTP->getType()
5290 << (Kind != Sema::TPL_TemplateMatch);
5291 S.Diag(OldNTTP->getLocation(),
5292 diag::note_template_nontype_parm_prev_declaration)
5293 << OldNTTP->getType();
5294 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005295
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005296 return false;
5297 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005298
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005299 return true;
5300 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005301
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005302 // For template template parameters, check the template parameter types.
5303 // The template parameter lists of template template
5304 // parameters must agree.
5305 if (TemplateTemplateParmDecl *OldTTP
5306 = dyn_cast<TemplateTemplateParmDecl>(Old)) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005307 TemplateTemplateParmDecl *NewTTP = cast<TemplateTemplateParmDecl>(New);
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005308 return S.TemplateParameterListsAreEqual(NewTTP->getTemplateParameters(),
5309 OldTTP->getTemplateParameters(),
5310 Complain,
5311 (Kind == Sema::TPL_TemplateMatch
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005312 ? Sema::TPL_TemplateTemplateParmMatch
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005313 : Kind),
5314 TemplateArgLoc);
5315 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005316
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005317 return true;
5318}
Douglas Gregor02024a92010-03-28 02:42:43 +00005319
Douglas Gregora0347822011-01-13 00:08:50 +00005320/// \brief Diagnose a known arity mismatch when comparing template argument
5321/// lists.
5322static
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005323void DiagnoseTemplateParameterListArityMismatch(Sema &S,
Douglas Gregora0347822011-01-13 00:08:50 +00005324 TemplateParameterList *New,
5325 TemplateParameterList *Old,
5326 Sema::TemplateParameterListEqualKind Kind,
5327 SourceLocation TemplateArgLoc) {
5328 unsigned NextDiag = diag::err_template_param_list_different_arity;
5329 if (TemplateArgLoc.isValid()) {
5330 S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch);
5331 NextDiag = diag::note_template_param_list_different_arity;
5332 }
5333 S.Diag(New->getTemplateLoc(), NextDiag)
5334 << (New->size() > Old->size())
5335 << (Kind != Sema::TPL_TemplateMatch)
5336 << SourceRange(New->getTemplateLoc(), New->getRAngleLoc());
5337 S.Diag(Old->getTemplateLoc(), diag::note_template_prev_declaration)
5338 << (Kind != Sema::TPL_TemplateMatch)
5339 << SourceRange(Old->getTemplateLoc(), Old->getRAngleLoc());
5340}
5341
Douglas Gregorddc29e12009-02-06 22:42:48 +00005342/// \brief Determine whether the given template parameter lists are
5343/// equivalent.
5344///
Mike Stump1eb44332009-09-09 15:08:12 +00005345/// \param New The new template parameter list, typically written in the
Douglas Gregorddc29e12009-02-06 22:42:48 +00005346/// source code as part of a new template declaration.
5347///
5348/// \param Old The old template parameter list, typically found via
5349/// name lookup of the template declared with this template parameter
5350/// list.
5351///
5352/// \param Complain If true, this routine will produce a diagnostic if
5353/// the template parameter lists are not equivalent.
5354///
Douglas Gregorfb898e12009-11-12 16:20:59 +00005355/// \param Kind describes how we are to match the template parameter lists.
Douglas Gregordd0574e2009-02-10 00:24:35 +00005356///
5357/// \param TemplateArgLoc If this source location is valid, then we
5358/// are actually checking the template parameter list of a template
5359/// argument (New) against the template parameter list of its
5360/// corresponding template template parameter (Old). We produce
5361/// slightly different diagnostics in this scenario.
5362///
Douglas Gregorddc29e12009-02-06 22:42:48 +00005363/// \returns True if the template parameter lists are equal, false
5364/// otherwise.
Mike Stump1eb44332009-09-09 15:08:12 +00005365bool
Douglas Gregorddc29e12009-02-06 22:42:48 +00005366Sema::TemplateParameterListsAreEqual(TemplateParameterList *New,
5367 TemplateParameterList *Old,
5368 bool Complain,
Douglas Gregorfb898e12009-11-12 16:20:59 +00005369 TemplateParameterListEqualKind Kind,
Douglas Gregordd0574e2009-02-10 00:24:35 +00005370 SourceLocation TemplateArgLoc) {
Douglas Gregora0347822011-01-13 00:08:50 +00005371 if (Old->size() != New->size() && Kind != TPL_TemplateTemplateArgumentMatch) {
5372 if (Complain)
5373 DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind,
5374 TemplateArgLoc);
Douglas Gregorddc29e12009-02-06 22:42:48 +00005375
5376 return false;
5377 }
5378
Douglas Gregorab7ddf02011-01-12 23:45:44 +00005379 // C++0x [temp.arg.template]p3:
5380 // A template-argument matches a template template-parameter (call it P)
NAKAMURA Takumi00995302011-01-27 07:09:49 +00005381 // when each of the template parameters in the template-parameter-list of
Richard Smith3e4c6c42011-05-05 21:57:07 +00005382 // the template-argument's corresponding class template or alias template
NAKAMURA Takumi00995302011-01-27 07:09:49 +00005383 // (call it A) matches the corresponding template parameter in the
Douglas Gregora0347822011-01-13 00:08:50 +00005384 // template-parameter-list of P. [...]
5385 TemplateParameterList::iterator NewParm = New->begin();
5386 TemplateParameterList::iterator NewParmEnd = New->end();
Douglas Gregorddc29e12009-02-06 22:42:48 +00005387 for (TemplateParameterList::iterator OldParm = Old->begin(),
Douglas Gregora0347822011-01-13 00:08:50 +00005388 OldParmEnd = Old->end();
5389 OldParm != OldParmEnd; ++OldParm) {
Douglas Gregorc421f542011-01-13 18:47:47 +00005390 if (Kind != TPL_TemplateTemplateArgumentMatch ||
5391 !(*OldParm)->isTemplateParameterPack()) {
Douglas Gregora0347822011-01-13 00:08:50 +00005392 if (NewParm == NewParmEnd) {
5393 if (Complain)
5394 DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind,
5395 TemplateArgLoc);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005396
Douglas Gregora0347822011-01-13 00:08:50 +00005397 return false;
5398 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005399
Douglas Gregora0347822011-01-13 00:08:50 +00005400 if (!MatchTemplateParameterKind(*this, *NewParm, *OldParm, Complain,
5401 Kind, TemplateArgLoc))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005402 return false;
5403
Douglas Gregora0347822011-01-13 00:08:50 +00005404 ++NewParm;
5405 continue;
5406 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005407
Douglas Gregora0347822011-01-13 00:08:50 +00005408 // C++0x [temp.arg.template]p3:
NAKAMURA Takumi00995302011-01-27 07:09:49 +00005409 // [...] When P's template- parameter-list contains a template parameter
5410 // pack (14.5.3), the template parameter pack will match zero or more
5411 // template parameters or template parameter packs in the
Douglas Gregora0347822011-01-13 00:08:50 +00005412 // template-parameter-list of A with the same type and form as the
5413 // template parameter pack in P (ignoring whether those template
5414 // parameters are template parameter packs).
5415 for (; NewParm != NewParmEnd; ++NewParm) {
5416 if (!MatchTemplateParameterKind(*this, *NewParm, *OldParm, Complain,
5417 Kind, TemplateArgLoc))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005418 return false;
Douglas Gregora0347822011-01-13 00:08:50 +00005419 }
Douglas Gregorddc29e12009-02-06 22:42:48 +00005420 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005421
Douglas Gregora0347822011-01-13 00:08:50 +00005422 // Make sure we exhausted all of the arguments.
5423 if (NewParm != NewParmEnd) {
5424 if (Complain)
5425 DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind,
5426 TemplateArgLoc);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005427
Douglas Gregora0347822011-01-13 00:08:50 +00005428 return false;
5429 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005430
Douglas Gregorddc29e12009-02-06 22:42:48 +00005431 return true;
5432}
5433
5434/// \brief Check whether a template can be declared within this scope.
5435///
5436/// If the template declaration is valid in this scope, returns
5437/// false. Otherwise, issues a diagnostic and returns true.
Mike Stump1eb44332009-09-09 15:08:12 +00005438bool
Douglas Gregor05396e22009-08-25 17:23:04 +00005439Sema::CheckTemplateDeclScope(Scope *S, TemplateParameterList *TemplateParams) {
Douglas Gregorfb35e8f2011-11-03 16:37:14 +00005440 if (!S)
5441 return false;
5442
Douglas Gregorddc29e12009-02-06 22:42:48 +00005443 // Find the nearest enclosing declaration scope.
5444 while ((S->getFlags() & Scope::DeclScope) == 0 ||
5445 (S->getFlags() & Scope::TemplateParamScope) != 0)
5446 S = S->getParent();
Mike Stump1eb44332009-09-09 15:08:12 +00005447
Douglas Gregorddc29e12009-02-06 22:42:48 +00005448 // C++ [temp]p2:
5449 // A template-declaration can appear only as a namespace scope or
5450 // class scope declaration.
5451 DeclContext *Ctx = static_cast<DeclContext *>(S->getEntity());
Eli Friedman1503f772009-07-31 01:43:05 +00005452 if (Ctx && isa<LinkageSpecDecl>(Ctx) &&
5453 cast<LinkageSpecDecl>(Ctx)->getLanguage() != LinkageSpecDecl::lang_cxx)
Mike Stump1eb44332009-09-09 15:08:12 +00005454 return Diag(TemplateParams->getTemplateLoc(), diag::err_template_linkage)
Douglas Gregor05396e22009-08-25 17:23:04 +00005455 << TemplateParams->getSourceRange();
Mike Stump1eb44332009-09-09 15:08:12 +00005456
Eli Friedman1503f772009-07-31 01:43:05 +00005457 while (Ctx && isa<LinkageSpecDecl>(Ctx))
Douglas Gregorddc29e12009-02-06 22:42:48 +00005458 Ctx = Ctx->getParent();
Douglas Gregorddc29e12009-02-06 22:42:48 +00005459
5460 if (Ctx && (Ctx->isFileContext() || Ctx->isRecord()))
5461 return false;
5462
Mike Stump1eb44332009-09-09 15:08:12 +00005463 return Diag(TemplateParams->getTemplateLoc(),
Douglas Gregor05396e22009-08-25 17:23:04 +00005464 diag::err_template_outside_namespace_or_class_scope)
5465 << TemplateParams->getSourceRange();
Douglas Gregorddc29e12009-02-06 22:42:48 +00005466}
Douglas Gregorcc636682009-02-17 23:15:12 +00005467
Douglas Gregord5cb8762009-10-07 00:13:32 +00005468/// \brief Determine what kind of template specialization the given declaration
5469/// is.
Douglas Gregorf785a7d2012-01-14 15:55:47 +00005470static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D) {
Douglas Gregord5cb8762009-10-07 00:13:32 +00005471 if (!D)
5472 return TSK_Undeclared;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005473
Douglas Gregorf6b11852009-10-08 15:14:33 +00005474 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D))
5475 return Record->getTemplateSpecializationKind();
Douglas Gregord5cb8762009-10-07 00:13:32 +00005476 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D))
5477 return Function->getTemplateSpecializationKind();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005478 if (VarDecl *Var = dyn_cast<VarDecl>(D))
5479 return Var->getTemplateSpecializationKind();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005480
Douglas Gregord5cb8762009-10-07 00:13:32 +00005481 return TSK_Undeclared;
5482}
5483
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005484/// \brief Check whether a specialization is well-formed in the current
Douglas Gregor9302da62009-10-14 23:50:59 +00005485/// context.
Douglas Gregor88b70942009-02-25 22:02:03 +00005486///
Douglas Gregor9302da62009-10-14 23:50:59 +00005487/// This routine determines whether a template specialization can be declared
5488/// in the current context (C++ [temp.expl.spec]p2).
Douglas Gregord5cb8762009-10-07 00:13:32 +00005489///
5490/// \param S the semantic analysis object for which this check is being
5491/// performed.
5492///
5493/// \param Specialized the entity being specialized or instantiated, which
5494/// may be a kind of template (class template, function template, etc.) or
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005495/// a member of a class template (member function, static data member,
Douglas Gregord5cb8762009-10-07 00:13:32 +00005496/// member class).
5497///
5498/// \param PrevDecl the previous declaration of this entity, if any.
5499///
5500/// \param Loc the location of the explicit specialization or instantiation of
5501/// this entity.
5502///
5503/// \param IsPartialSpecialization whether this is a partial specialization of
5504/// a class template.
5505///
Douglas Gregord5cb8762009-10-07 00:13:32 +00005506/// \returns true if there was an error that we cannot recover from, false
5507/// otherwise.
5508static bool CheckTemplateSpecializationScope(Sema &S,
5509 NamedDecl *Specialized,
5510 NamedDecl *PrevDecl,
5511 SourceLocation Loc,
Douglas Gregor9302da62009-10-14 23:50:59 +00005512 bool IsPartialSpecialization) {
Douglas Gregord5cb8762009-10-07 00:13:32 +00005513 // Keep these "kind" numbers in sync with the %select statements in the
5514 // various diagnostics emitted by this routine.
5515 int EntityKind = 0;
Ted Kremenekfe62b062011-01-14 22:31:36 +00005516 if (isa<ClassTemplateDecl>(Specialized))
Douglas Gregord5cb8762009-10-07 00:13:32 +00005517 EntityKind = IsPartialSpecialization? 1 : 0;
Larisse Voufoef4579c2013-08-06 01:03:05 +00005518 else if (isa<VarTemplateDecl>(Specialized))
5519 EntityKind = IsPartialSpecialization ? 3 : 2;
Ted Kremenekfe62b062011-01-14 22:31:36 +00005520 else if (isa<FunctionTemplateDecl>(Specialized))
Douglas Gregord5cb8762009-10-07 00:13:32 +00005521 EntityKind = 4;
Larisse Voufoef4579c2013-08-06 01:03:05 +00005522 else if (isa<CXXMethodDecl>(Specialized))
Douglas Gregord5cb8762009-10-07 00:13:32 +00005523 EntityKind = 5;
Larisse Voufoef4579c2013-08-06 01:03:05 +00005524 else if (isa<VarDecl>(Specialized))
Richard Smith1af83c42012-03-23 03:33:32 +00005525 EntityKind = 6;
Larisse Voufoef4579c2013-08-06 01:03:05 +00005526 else if (isa<RecordDecl>(Specialized))
5527 EntityKind = 7;
5528 else if (isa<EnumDecl>(Specialized) && S.getLangOpts().CPlusPlus11)
5529 EntityKind = 8;
Douglas Gregord5cb8762009-10-07 00:13:32 +00005530 else {
Richard Smith1af83c42012-03-23 03:33:32 +00005531 S.Diag(Loc, diag::err_template_spec_unknown_kind)
Richard Smith80ad52f2013-01-02 11:42:31 +00005532 << S.getLangOpts().CPlusPlus11;
Douglas Gregor9302da62009-10-14 23:50:59 +00005533 S.Diag(Specialized->getLocation(), diag::note_specialized_entity);
Douglas Gregord5cb8762009-10-07 00:13:32 +00005534 return true;
5535 }
5536
Douglas Gregor88b70942009-02-25 22:02:03 +00005537 // C++ [temp.expl.spec]p2:
5538 // An explicit specialization shall be declared in the namespace
5539 // of which the template is a member, or, for member templates, in
5540 // the namespace of which the enclosing class or enclosing class
5541 // template is a member. An explicit specialization of a member
5542 // function, member class or static data member of a class
5543 // template shall be declared in the namespace of which the class
5544 // template is a member. Such a declaration may also be a
5545 // definition. If the declaration is not a definition, the
5546 // specialization may be defined later in the name- space in which
5547 // the explicit specialization was declared, or in a namespace
5548 // that encloses the one in which the explicit specialization was
5549 // declared.
Sebastian Redl7a126a42010-08-31 00:36:30 +00005550 if (S.CurContext->getRedeclContext()->isFunctionOrMethod()) {
Douglas Gregord5cb8762009-10-07 00:13:32 +00005551 S.Diag(Loc, diag::err_template_spec_decl_function_scope)
Douglas Gregor9302da62009-10-14 23:50:59 +00005552 << Specialized;
Douglas Gregor88b70942009-02-25 22:02:03 +00005553 return true;
5554 }
Douglas Gregor7974c3b2009-10-07 17:21:34 +00005555
Douglas Gregor0a407472009-10-07 17:30:37 +00005556 if (S.CurContext->isRecord() && !IsPartialSpecialization) {
David Blaikie4e4d0842012-03-11 07:00:24 +00005557 if (S.getLangOpts().MicrosoftExt) {
Francois Pichetaf0f4d02011-08-14 03:52:19 +00005558 // Do not warn for class scope explicit specialization during
5559 // instantiation, warning was already emitted during pattern
5560 // semantic analysis.
5561 if (!S.ActiveTemplateInstantiations.size())
5562 S.Diag(Loc, diag::ext_function_specialization_in_class)
5563 << Specialized;
5564 } else {
5565 S.Diag(Loc, diag::err_template_spec_decl_class_scope)
5566 << Specialized;
5567 return true;
5568 }
Douglas Gregor0a407472009-10-07 17:30:37 +00005569 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005570
Douglas Gregor8e0c1182011-10-20 16:41:18 +00005571 if (S.CurContext->isRecord() &&
5572 !S.CurContext->Equals(Specialized->getDeclContext())) {
5573 // Make sure that we're specializing in the right record context.
5574 // Otherwise, things can go horribly wrong.
5575 S.Diag(Loc, diag::err_template_spec_decl_class_scope)
5576 << Specialized;
5577 return true;
5578 }
5579
Douglas Gregor7974c3b2009-10-07 17:21:34 +00005580 // C++ [temp.class.spec]p6:
5581 // A class template partial specialization may be declared or redeclared
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005582 // in any namespace scope in which its definition may be defined (14.5.1
5583 // and 14.5.2).
Douglas Gregord5cb8762009-10-07 00:13:32 +00005584 bool ComplainedAboutScope = false;
Douglas Gregor8e0c1182011-10-20 16:41:18 +00005585 DeclContext *SpecializedContext
Douglas Gregord5cb8762009-10-07 00:13:32 +00005586 = Specialized->getDeclContext()->getEnclosingNamespaceContext();
Douglas Gregor7974c3b2009-10-07 17:21:34 +00005587 DeclContext *DC = S.CurContext->getEnclosingNamespaceContext();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005588 if ((!PrevDecl ||
Douglas Gregor9302da62009-10-14 23:50:59 +00005589 getTemplateSpecializationKind(PrevDecl) == TSK_Undeclared ||
5590 getTemplateSpecializationKind(PrevDecl) == TSK_ImplicitInstantiation)){
Douglas Gregor121dc9a2010-09-12 05:08:28 +00005591 // C++ [temp.exp.spec]p2:
5592 // An explicit specialization shall be declared in the namespace of which
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005593 // the template is a member, or, for member templates, in the namespace
Douglas Gregor121dc9a2010-09-12 05:08:28 +00005594 // of which the enclosing class or enclosing class template is a member.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005595 // An explicit specialization of a member function, member class or
5596 // static data member of a class template shall be declared in the
Douglas Gregor121dc9a2010-09-12 05:08:28 +00005597 // namespace of which the class template is a member.
5598 //
5599 // C++0x [temp.expl.spec]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005600 // An explicit specialization shall be declared in a namespace enclosing
Douglas Gregor121dc9a2010-09-12 05:08:28 +00005601 // the specialized template.
Richard Smithebaf0e62011-10-18 20:49:44 +00005602 if (!DC->InEnclosingNamespaceSetOf(SpecializedContext)) {
Richard Smith80ad52f2013-01-02 11:42:31 +00005603 bool IsCPlusPlus11Extension = DC->Encloses(SpecializedContext);
Richard Smithebaf0e62011-10-18 20:49:44 +00005604 if (isa<TranslationUnitDecl>(SpecializedContext)) {
Richard Smith80ad52f2013-01-02 11:42:31 +00005605 assert(!IsCPlusPlus11Extension &&
Richard Smithebaf0e62011-10-18 20:49:44 +00005606 "DC encloses TU but isn't in enclosing namespace set");
5607 S.Diag(Loc, diag::err_template_spec_decl_out_of_scope_global)
Douglas Gregora4d5de52010-09-12 05:24:55 +00005608 << EntityKind << Specialized;
Richard Smithebaf0e62011-10-18 20:49:44 +00005609 } else if (isa<NamespaceDecl>(SpecializedContext)) {
5610 int Diag;
Richard Smith80ad52f2013-01-02 11:42:31 +00005611 if (!IsCPlusPlus11Extension)
Richard Smithebaf0e62011-10-18 20:49:44 +00005612 Diag = diag::err_template_spec_decl_out_of_scope;
Richard Smith80ad52f2013-01-02 11:42:31 +00005613 else if (!S.getLangOpts().CPlusPlus11)
Richard Smithebaf0e62011-10-18 20:49:44 +00005614 Diag = diag::ext_template_spec_decl_out_of_scope;
5615 else
5616 Diag = diag::warn_cxx98_compat_template_spec_decl_out_of_scope;
5617 S.Diag(Loc, Diag)
5618 << EntityKind << Specialized << cast<NamedDecl>(SpecializedContext);
5619 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005620
Douglas Gregor9302da62009-10-14 23:50:59 +00005621 S.Diag(Specialized->getLocation(), diag::note_specialized_entity);
Richard Smithebaf0e62011-10-18 20:49:44 +00005622 ComplainedAboutScope =
Richard Smith80ad52f2013-01-02 11:42:31 +00005623 !(IsCPlusPlus11Extension && S.getLangOpts().CPlusPlus11);
Douglas Gregor88b70942009-02-25 22:02:03 +00005624 }
Douglas Gregor88b70942009-02-25 22:02:03 +00005625 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005626
5627 // Make sure that this redeclaration (or definition) occurs in an enclosing
Douglas Gregor9302da62009-10-14 23:50:59 +00005628 // namespace.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005629 // Note that HandleDeclarator() performs this check for explicit
Douglas Gregord5cb8762009-10-07 00:13:32 +00005630 // specializations of function templates, static data members, and member
5631 // functions, so we skip the check here for those kinds of entities.
5632 // FIXME: HandleDeclarator's diagnostics aren't quite as good, though.
Douglas Gregor7974c3b2009-10-07 17:21:34 +00005633 // Should we refactor that check, so that it occurs later?
5634 if (!ComplainedAboutScope && !DC->Encloses(SpecializedContext) &&
Douglas Gregor9302da62009-10-14 23:50:59 +00005635 !(isa<FunctionTemplateDecl>(Specialized) || isa<VarDecl>(Specialized) ||
5636 isa<FunctionDecl>(Specialized))) {
Douglas Gregord5cb8762009-10-07 00:13:32 +00005637 if (isa<TranslationUnitDecl>(SpecializedContext))
5638 S.Diag(Loc, diag::err_template_spec_redecl_global_scope)
5639 << EntityKind << Specialized;
5640 else if (isa<NamespaceDecl>(SpecializedContext))
5641 S.Diag(Loc, diag::err_template_spec_redecl_out_of_scope)
5642 << EntityKind << Specialized
5643 << cast<NamedDecl>(SpecializedContext);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005644
Douglas Gregor9302da62009-10-14 23:50:59 +00005645 S.Diag(Specialized->getLocation(), diag::note_specialized_entity);
Douglas Gregor88b70942009-02-25 22:02:03 +00005646 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005647
Douglas Gregord5cb8762009-10-07 00:13:32 +00005648 // FIXME: check for specialization-after-instantiation errors and such.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005649
Douglas Gregor88b70942009-02-25 22:02:03 +00005650 return false;
5651}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005652
Larisse Voufoef4579c2013-08-06 01:03:05 +00005653/// \brief Subroutine of Sema::CheckTemplatePartialSpecializationArgs
Douglas Gregorbacb9492011-01-03 21:13:47 +00005654/// that checks non-type template partial specialization arguments.
Larisse Voufoef4579c2013-08-06 01:03:05 +00005655static bool CheckNonTypeTemplatePartialSpecializationArgs(
5656 Sema &S, NonTypeTemplateParmDecl *Param, const TemplateArgument *Args,
5657 unsigned NumArgs) {
Douglas Gregorbacb9492011-01-03 21:13:47 +00005658 for (unsigned I = 0; I != NumArgs; ++I) {
5659 if (Args[I].getKind() == TemplateArgument::Pack) {
Larisse Voufoef4579c2013-08-06 01:03:05 +00005660 if (CheckNonTypeTemplatePartialSpecializationArgs(
5661 S, Param, Args[I].pack_begin(), Args[I].pack_size()))
Douglas Gregorbacb9492011-01-03 21:13:47 +00005662 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005663
Douglas Gregore94866f2009-06-12 21:21:02 +00005664 continue;
Douglas Gregorbacb9492011-01-03 21:13:47 +00005665 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005666
Eli Friedmand7a6b162012-09-26 02:36:12 +00005667 if (Args[I].getKind() != TemplateArgument::Expression)
Douglas Gregore94866f2009-06-12 21:21:02 +00005668 continue;
Eli Friedmand7a6b162012-09-26 02:36:12 +00005669
5670 Expr *ArgExpr = Args[I].getAsExpr();
Douglas Gregore94866f2009-06-12 21:21:02 +00005671
Douglas Gregor7a21fd42011-01-03 21:37:45 +00005672 // We can have a pack expansion of any of the bullets below.
Douglas Gregorbacb9492011-01-03 21:13:47 +00005673 if (PackExpansionExpr *Expansion = dyn_cast<PackExpansionExpr>(ArgExpr))
5674 ArgExpr = Expansion->getPattern();
Douglas Gregor54c53cc2011-01-04 23:35:54 +00005675
5676 // Strip off any implicit casts we added as part of type checking.
5677 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr))
5678 ArgExpr = ICE->getSubExpr();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005679
Douglas Gregore94866f2009-06-12 21:21:02 +00005680 // C++ [temp.class.spec]p8:
5681 // A non-type argument is non-specialized if it is the name of a
5682 // non-type parameter. All other non-type arguments are
5683 // specialized.
5684 //
5685 // Below, we check the two conditions that only apply to
5686 // specialized non-type arguments, so skip any non-specialized
5687 // arguments.
5688 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ArgExpr))
Douglas Gregor54c53cc2011-01-04 23:35:54 +00005689 if (isa<NonTypeTemplateParmDecl>(DRE->getDecl()))
Douglas Gregore94866f2009-06-12 21:21:02 +00005690 continue;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005691
Douglas Gregore94866f2009-06-12 21:21:02 +00005692 // C++ [temp.class.spec]p9:
5693 // Within the argument list of a class template partial
5694 // specialization, the following restrictions apply:
5695 // -- A partially specialized non-type argument expression
5696 // shall not involve a template parameter of the partial
5697 // specialization except when the argument expression is a
5698 // simple identifier.
5699 if (ArgExpr->isTypeDependent() || ArgExpr->isValueDependent()) {
Douglas Gregorbacb9492011-01-03 21:13:47 +00005700 S.Diag(ArgExpr->getLocStart(),
Douglas Gregore94866f2009-06-12 21:21:02 +00005701 diag::err_dependent_non_type_arg_in_partial_spec)
5702 << ArgExpr->getSourceRange();
5703 return true;
5704 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005705
Douglas Gregore94866f2009-06-12 21:21:02 +00005706 // -- The type of a template parameter corresponding to a
5707 // specialized non-type argument shall not be dependent on a
5708 // parameter of the specialization.
5709 if (Param->getType()->isDependentType()) {
Douglas Gregorbacb9492011-01-03 21:13:47 +00005710 S.Diag(ArgExpr->getLocStart(),
Douglas Gregore94866f2009-06-12 21:21:02 +00005711 diag::err_dependent_typed_non_type_arg_in_partial_spec)
5712 << Param->getType()
5713 << ArgExpr->getSourceRange();
Douglas Gregorbacb9492011-01-03 21:13:47 +00005714 S.Diag(Param->getLocation(), diag::note_template_param_here);
Douglas Gregore94866f2009-06-12 21:21:02 +00005715 return true;
5716 }
5717 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005718
Douglas Gregorbacb9492011-01-03 21:13:47 +00005719 return false;
5720}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005721
Douglas Gregorbacb9492011-01-03 21:13:47 +00005722/// \brief Check the non-type template arguments of a class template
5723/// partial specialization according to C++ [temp.class.spec]p9.
5724///
5725/// \param TemplateParams the template parameters of the primary class
5726/// template.
5727///
James Dennett1dfbd922012-06-14 21:40:34 +00005728/// \param TemplateArgs the template arguments of the class template
Douglas Gregorbacb9492011-01-03 21:13:47 +00005729/// partial specialization.
5730///
5731/// \returns true if there was an error, false otherwise.
Larisse Voufoef4579c2013-08-06 01:03:05 +00005732static bool CheckTemplatePartialSpecializationArgs(
5733 Sema &S, TemplateParameterList *TemplateParams,
5734 SmallVectorImpl<TemplateArgument> &TemplateArgs) {
Douglas Gregorbacb9492011-01-03 21:13:47 +00005735 const TemplateArgument *ArgList = TemplateArgs.data();
5736
5737 for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) {
5738 NonTypeTemplateParmDecl *Param
5739 = dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(I));
5740 if (!Param)
5741 continue;
5742
Larisse Voufoef4579c2013-08-06 01:03:05 +00005743 if (CheckNonTypeTemplatePartialSpecializationArgs(S, Param, &ArgList[I], 1))
Douglas Gregorbacb9492011-01-03 21:13:47 +00005744 return true;
5745 }
Douglas Gregore94866f2009-06-12 21:21:02 +00005746
5747 return false;
5748}
5749
John McCalld226f652010-08-21 09:40:31 +00005750DeclResult
John McCall0f434ec2009-07-31 02:45:11 +00005751Sema::ActOnClassTemplateSpecialization(Scope *S, unsigned TagSpec,
5752 TagUseKind TUK,
Mike Stump1eb44332009-09-09 15:08:12 +00005753 SourceLocation KWLoc,
Douglas Gregord023aec2011-09-09 20:53:38 +00005754 SourceLocation ModulePrivateLoc,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00005755 CXXScopeSpec &SS,
Douglas Gregor7532dc62009-03-30 22:58:21 +00005756 TemplateTy TemplateD,
Douglas Gregorcc636682009-02-17 23:15:12 +00005757 SourceLocation TemplateNameLoc,
5758 SourceLocation LAngleLoc,
Douglas Gregor40808ce2009-03-09 23:48:35 +00005759 ASTTemplateArgsPtr TemplateArgsIn,
Douglas Gregorcc636682009-02-17 23:15:12 +00005760 SourceLocation RAngleLoc,
5761 AttributeList *Attr,
5762 MultiTemplateParamsArg TemplateParameterLists) {
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005763 assert(TUK != TUK_Reference && "References are not specializations");
John McCallf1bbbb42009-09-04 01:14:41 +00005764
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005765 // NOTE: KWLoc is the location of the tag keyword. This will instead
5766 // store the location of the outermost template keyword in the declaration.
5767 SourceLocation TemplateKWLoc = TemplateParameterLists.size() > 0
Benjamin Kramer3fe198b2012-08-23 21:35:17 +00005768 ? TemplateParameterLists[0]->getTemplateLoc() : SourceLocation();
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005769
Douglas Gregorcc636682009-02-17 23:15:12 +00005770 // Find the class template we're specializing
Serge Pavlov18062392013-08-27 13:15:56 +00005771 TemplateName Name = TemplateD.get();
Mike Stump1eb44332009-09-09 15:08:12 +00005772 ClassTemplateDecl *ClassTemplate
Douglas Gregor8b13c082009-11-12 00:46:20 +00005773 = dyn_cast_or_null<ClassTemplateDecl>(Name.getAsTemplateDecl());
5774
5775 if (!ClassTemplate) {
5776 Diag(TemplateNameLoc, diag::err_not_class_template_specialization)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005777 << (Name.getAsTemplateDecl() &&
Douglas Gregor8b13c082009-11-12 00:46:20 +00005778 isa<TemplateTemplateParmDecl>(Name.getAsTemplateDecl()));
5779 return true;
5780 }
Douglas Gregorcc636682009-02-17 23:15:12 +00005781
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005782 bool isExplicitSpecialization = false;
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005783 bool isPartialSpecialization = false;
5784
Douglas Gregor88b70942009-02-25 22:02:03 +00005785 // Check the validity of the template headers that introduce this
5786 // template.
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005787 // FIXME: We probably shouldn't complain about these headers for
5788 // friend declarations.
Douglas Gregor0167f3c2010-07-14 23:14:12 +00005789 bool Invalid = false;
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00005790 TemplateParameterList *TemplateParams =
5791 MatchTemplateParametersToScopeSpecifier(
5792 TemplateNameLoc, TemplateNameLoc, SS, TemplateParameterLists,
5793 TUK == TUK_Friend, isExplicitSpecialization, Invalid);
Douglas Gregor0167f3c2010-07-14 23:14:12 +00005794 if (Invalid)
5795 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005796
Douglas Gregor05396e22009-08-25 17:23:04 +00005797 if (TemplateParams && TemplateParams->size() > 0) {
5798 isPartialSpecialization = true;
Douglas Gregor88b70942009-02-25 22:02:03 +00005799
Douglas Gregorb0ee93c2010-12-21 08:14:57 +00005800 if (TUK == TUK_Friend) {
5801 Diag(KWLoc, diag::err_partial_specialization_friend)
5802 << SourceRange(LAngleLoc, RAngleLoc);
5803 return true;
5804 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005805
Douglas Gregor05396e22009-08-25 17:23:04 +00005806 // C++ [temp.class.spec]p10:
5807 // The template parameter list of a specialization shall not
5808 // contain default template argument values.
5809 for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) {
5810 Decl *Param = TemplateParams->getParam(I);
5811 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
5812 if (TTP->hasDefaultArgument()) {
Mike Stump1eb44332009-09-09 15:08:12 +00005813 Diag(TTP->getDefaultArgumentLoc(),
Douglas Gregor05396e22009-08-25 17:23:04 +00005814 diag::err_default_arg_in_partial_spec);
John McCall833ca992009-10-29 08:12:44 +00005815 TTP->removeDefaultArgument();
Douglas Gregor05396e22009-08-25 17:23:04 +00005816 }
5817 } else if (NonTypeTemplateParmDecl *NTTP
5818 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
5819 if (Expr *DefArg = NTTP->getDefaultArgument()) {
Mike Stump1eb44332009-09-09 15:08:12 +00005820 Diag(NTTP->getDefaultArgumentLoc(),
Douglas Gregor05396e22009-08-25 17:23:04 +00005821 diag::err_default_arg_in_partial_spec)
5822 << DefArg->getSourceRange();
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00005823 NTTP->removeDefaultArgument();
Douglas Gregor05396e22009-08-25 17:23:04 +00005824 }
5825 } else {
5826 TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(Param);
Douglas Gregor788cd062009-11-11 01:00:40 +00005827 if (TTP->hasDefaultArgument()) {
5828 Diag(TTP->getDefaultArgument().getLocation(),
Douglas Gregor05396e22009-08-25 17:23:04 +00005829 diag::err_default_arg_in_partial_spec)
Douglas Gregor788cd062009-11-11 01:00:40 +00005830 << TTP->getDefaultArgument().getSourceRange();
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00005831 TTP->removeDefaultArgument();
Douglas Gregorba1ecb52009-06-12 19:43:02 +00005832 }
5833 }
5834 }
Douglas Gregora735b202009-10-13 14:39:41 +00005835 } else if (TemplateParams) {
5836 if (TUK == TUK_Friend)
5837 Diag(KWLoc, diag::err_template_spec_friend)
Douglas Gregor849b2432010-03-31 17:46:05 +00005838 << FixItHint::CreateRemoval(
Douglas Gregora735b202009-10-13 14:39:41 +00005839 SourceRange(TemplateParams->getTemplateLoc(),
5840 TemplateParams->getRAngleLoc()))
5841 << SourceRange(LAngleLoc, RAngleLoc);
5842 else
5843 isExplicitSpecialization = true;
5844 } else if (TUK != TUK_Friend) {
Douglas Gregor05396e22009-08-25 17:23:04 +00005845 Diag(KWLoc, diag::err_template_spec_needs_header)
Douglas Gregor849b2432010-03-31 17:46:05 +00005846 << FixItHint::CreateInsertion(KWLoc, "template<> ");
Argyrios Kyrtzidisd62d9012013-06-05 17:52:24 +00005847 TemplateKWLoc = KWLoc;
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005848 isExplicitSpecialization = true;
5849 }
Douglas Gregor88b70942009-02-25 22:02:03 +00005850
Douglas Gregorcc636682009-02-17 23:15:12 +00005851 // Check that the specialization uses the same tag kind as the
5852 // original template.
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005853 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
5854 assert(Kind != TTK_Enum && "Invalid enum tag in class template spec!");
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005855 if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(),
Richard Trieubbf34c02011-06-10 03:11:26 +00005856 Kind, TUK == TUK_Definition, KWLoc,
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005857 *ClassTemplate->getIdentifier())) {
Mike Stump1eb44332009-09-09 15:08:12 +00005858 Diag(KWLoc, diag::err_use_with_wrong_tag)
Douglas Gregora3a83512009-04-01 23:51:29 +00005859 << ClassTemplate
Douglas Gregor849b2432010-03-31 17:46:05 +00005860 << FixItHint::CreateReplacement(KWLoc,
Douglas Gregora3a83512009-04-01 23:51:29 +00005861 ClassTemplate->getTemplatedDecl()->getKindName());
Mike Stump1eb44332009-09-09 15:08:12 +00005862 Diag(ClassTemplate->getTemplatedDecl()->getLocation(),
Douglas Gregorcc636682009-02-17 23:15:12 +00005863 diag::note_previous_use);
5864 Kind = ClassTemplate->getTemplatedDecl()->getTagKind();
5865 }
5866
Douglas Gregor40808ce2009-03-09 23:48:35 +00005867 // Translate the parser's template argument list in our AST format.
John McCalld5532b62009-11-23 01:53:49 +00005868 TemplateArgumentListInfo TemplateArgs;
5869 TemplateArgs.setLAngleLoc(LAngleLoc);
5870 TemplateArgs.setRAngleLoc(RAngleLoc);
Douglas Gregor314b97f2009-11-10 19:49:08 +00005871 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
Douglas Gregor40808ce2009-03-09 23:48:35 +00005872
Douglas Gregor925910d2011-01-03 20:35:03 +00005873 // Check for unexpanded parameter packs in any of the template arguments.
5874 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005875 if (DiagnoseUnexpandedParameterPack(TemplateArgs[I],
Douglas Gregor925910d2011-01-03 20:35:03 +00005876 UPPC_PartialSpecialization))
5877 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005878
Douglas Gregorcc636682009-02-17 23:15:12 +00005879 // Check that the template argument list is well-formed for this
5880 // template.
Chris Lattner5f9e2722011-07-23 10:55:15 +00005881 SmallVector<TemplateArgument, 4> Converted;
John McCalld5532b62009-11-23 01:53:49 +00005882 if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc,
5883 TemplateArgs, false, Converted))
Douglas Gregor212e81c2009-03-25 00:13:59 +00005884 return true;
Douglas Gregorcc636682009-02-17 23:15:12 +00005885
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005886 // Find the class template (partial) specialization declaration that
Douglas Gregorcc636682009-02-17 23:15:12 +00005887 // corresponds to these arguments.
Douglas Gregorba1ecb52009-06-12 19:43:02 +00005888 if (isPartialSpecialization) {
Larisse Voufoef4579c2013-08-06 01:03:05 +00005889 if (CheckTemplatePartialSpecializationArgs(
5890 *this, ClassTemplate->getTemplateParameters(), Converted))
Douglas Gregore94866f2009-06-12 21:21:02 +00005891 return true;
5892
Douglas Gregor561f8122011-07-01 01:22:09 +00005893 bool InstantiationDependent;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005894 if (!Name.isDependent() &&
Douglas Gregorde090962010-02-09 00:37:32 +00005895 !TemplateSpecializationType::anyDependentTemplateArguments(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005896 TemplateArgs.getArgumentArray(),
Douglas Gregor561f8122011-07-01 01:22:09 +00005897 TemplateArgs.size(),
5898 InstantiationDependent)) {
Douglas Gregorde090962010-02-09 00:37:32 +00005899 Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized)
5900 << ClassTemplate->getDeclName();
5901 isPartialSpecialization = false;
Douglas Gregorde090962010-02-09 00:37:32 +00005902 }
5903 }
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005904
Douglas Gregorcc636682009-02-17 23:15:12 +00005905 void *InsertPos = 0;
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005906 ClassTemplateSpecializationDecl *PrevDecl = 0;
5907
5908 if (isPartialSpecialization)
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005909 // FIXME: Template parameter list matters, too
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005910 PrevDecl
Douglas Gregor910f8002010-11-07 23:05:16 +00005911 = ClassTemplate->findPartialSpecialization(Converted.data(),
5912 Converted.size(),
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005913 InsertPos);
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005914 else
5915 PrevDecl
Douglas Gregor910f8002010-11-07 23:05:16 +00005916 = ClassTemplate->findSpecialization(Converted.data(),
5917 Converted.size(), InsertPos);
Douglas Gregorcc636682009-02-17 23:15:12 +00005918
5919 ClassTemplateSpecializationDecl *Specialization = 0;
5920
Douglas Gregor88b70942009-02-25 22:02:03 +00005921 // Check whether we can declare a class template specialization in
5922 // the current scope.
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005923 if (TUK != TUK_Friend &&
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005924 CheckTemplateSpecializationScope(*this, ClassTemplate, PrevDecl,
5925 TemplateNameLoc,
Douglas Gregor9302da62009-10-14 23:50:59 +00005926 isPartialSpecialization))
Douglas Gregor212e81c2009-03-25 00:13:59 +00005927 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005928
Douglas Gregorb88e8882009-07-30 17:40:51 +00005929 // The canonical type
5930 QualType CanonType;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005931 if (PrevDecl &&
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005932 (PrevDecl->getSpecializationKind() == TSK_Undeclared ||
Douglas Gregorde090962010-02-09 00:37:32 +00005933 TUK == TUK_Friend)) {
Douglas Gregorcc636682009-02-17 23:15:12 +00005934 // Since the only prior class template specialization with these
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005935 // arguments was referenced but not declared, or we're only
5936 // referencing this specialization as a friend, reuse that
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005937 // declaration node as our own, updating its source location and
5938 // the list of outer template parameters to reflect our new declaration.
Douglas Gregorcc636682009-02-17 23:15:12 +00005939 Specialization = PrevDecl;
Douglas Gregor6bc9f7e2009-02-25 22:18:32 +00005940 Specialization->setLocation(TemplateNameLoc);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005941 if (TemplateParameterLists.size() > 0) {
5942 Specialization->setTemplateParameterListsInfo(Context,
5943 TemplateParameterLists.size(),
Benjamin Kramer5354e772012-08-23 23:38:35 +00005944 TemplateParameterLists.data());
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005945 }
Douglas Gregorcc636682009-02-17 23:15:12 +00005946 PrevDecl = 0;
Douglas Gregorb88e8882009-07-30 17:40:51 +00005947 CanonType = Context.getTypeDeclType(Specialization);
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005948 } else if (isPartialSpecialization) {
Douglas Gregorb88e8882009-07-30 17:40:51 +00005949 // Build the canonical type that describes the converted template
5950 // arguments of the class template partial specialization.
Douglas Gregorde090962010-02-09 00:37:32 +00005951 TemplateName CanonTemplate = Context.getCanonicalTemplateName(Name);
5952 CanonType = Context.getTemplateSpecializationType(CanonTemplate,
Douglas Gregorb9c66312010-12-23 17:13:55 +00005953 Converted.data(),
5954 Converted.size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005955
5956 if (Context.hasSameType(CanonType,
Douglas Gregorb9c66312010-12-23 17:13:55 +00005957 ClassTemplate->getInjectedClassNameSpecialization())) {
5958 // C++ [temp.class.spec]p9b3:
5959 //
5960 // -- The argument list of the specialization shall not be identical
5961 // to the implicit argument list of the primary template.
5962 Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template)
Richard Smithecbce692013-09-24 04:49:23 +00005963 << /*class template*/0 << (TUK == TUK_Definition)
Douglas Gregor8d267c52011-09-09 02:06:17 +00005964 << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc));
Douglas Gregorb9c66312010-12-23 17:13:55 +00005965 return CheckClassTemplate(S, TagSpec, TUK, KWLoc, SS,
5966 ClassTemplate->getIdentifier(),
5967 TemplateNameLoc,
5968 Attr,
5969 TemplateParams,
Douglas Gregore7612302011-09-09 19:05:14 +00005970 AS_none, /*ModulePrivateLoc=*/SourceLocation(),
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005971 TemplateParameterLists.size() - 1,
Benjamin Kramer5354e772012-08-23 23:38:35 +00005972 TemplateParameterLists.data());
Douglas Gregorb9c66312010-12-23 17:13:55 +00005973 }
Douglas Gregorb88e8882009-07-30 17:40:51 +00005974
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005975 // Create a new class template partial specialization declaration node.
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005976 ClassTemplatePartialSpecializationDecl *PrevPartial
5977 = cast_or_null<ClassTemplatePartialSpecializationDecl>(PrevDecl);
Mike Stump1eb44332009-09-09 15:08:12 +00005978 ClassTemplatePartialSpecializationDecl *Partial
Douglas Gregor13c85772010-05-06 00:28:52 +00005979 = ClassTemplatePartialSpecializationDecl::Create(Context, Kind,
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005980 ClassTemplate->getDeclContext(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00005981 KWLoc, TemplateNameLoc,
Anders Carlsson91fdf6f2009-06-05 04:06:48 +00005982 TemplateParams,
5983 ClassTemplate,
Douglas Gregor910f8002010-11-07 23:05:16 +00005984 Converted.data(),
5985 Converted.size(),
John McCalld5532b62009-11-23 01:53:49 +00005986 TemplateArgs,
John McCall3cb0ebd2010-03-10 03:28:59 +00005987 CanonType,
Richard Smith37fd27d2013-08-22 23:27:37 +00005988 PrevPartial);
John McCallb6217662010-03-15 10:12:16 +00005989 SetNestedNameSpecifier(Partial, SS);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005990 if (TemplateParameterLists.size() > 1 && SS.isSet()) {
Douglas Gregorc722ea42010-06-15 17:44:38 +00005991 Partial->setTemplateParameterListsInfo(Context,
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005992 TemplateParameterLists.size() - 1,
Benjamin Kramer5354e772012-08-23 23:38:35 +00005993 TemplateParameterLists.data());
Abramo Bagnara9b934882010-06-12 08:15:14 +00005994 }
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005995
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005996 if (!PrevPartial)
5997 ClassTemplate->AddPartialSpecialization(Partial, InsertPos);
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005998 Specialization = Partial;
Douglas Gregor031a5882009-06-13 00:26:55 +00005999
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006000 // If we are providing an explicit specialization of a member class
Douglas Gregored9c0f92009-10-29 00:04:11 +00006001 // template specialization, make a note of that.
6002 if (PrevPartial && PrevPartial->getInstantiatedFromMember())
6003 PrevPartial->setMemberSpecialization();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006004
Douglas Gregor031a5882009-06-13 00:26:55 +00006005 // Check that all of the template parameters of the class template
6006 // partial specialization are deducible from the template
6007 // arguments. If not, this class template partial specialization
6008 // will never be used.
Benjamin Kramer013b3662012-01-30 16:17:39 +00006009 llvm::SmallBitVector DeducibleParams(TemplateParams->size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006010 MarkUsedTemplateParameters(Partial->getTemplateArgs(), true,
Douglas Gregored9c0f92009-10-29 00:04:11 +00006011 TemplateParams->getDepth(),
Douglas Gregore73bb602009-09-14 21:25:05 +00006012 DeducibleParams);
Douglas Gregor031a5882009-06-13 00:26:55 +00006013
Benjamin Kramer013b3662012-01-30 16:17:39 +00006014 if (!DeducibleParams.all()) {
6015 unsigned NumNonDeducible = DeducibleParams.size()-DeducibleParams.count();
Douglas Gregor031a5882009-06-13 00:26:55 +00006016 Diag(TemplateNameLoc, diag::warn_partial_specs_not_deducible)
Richard Smithecbce692013-09-24 04:49:23 +00006017 << /*class template*/0 << (NumNonDeducible > 1)
Douglas Gregor031a5882009-06-13 00:26:55 +00006018 << SourceRange(TemplateNameLoc, RAngleLoc);
6019 for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) {
6020 if (!DeducibleParams[I]) {
6021 NamedDecl *Param = cast<NamedDecl>(TemplateParams->getParam(I));
6022 if (Param->getDeclName())
Mike Stump1eb44332009-09-09 15:08:12 +00006023 Diag(Param->getLocation(),
Douglas Gregor031a5882009-06-13 00:26:55 +00006024 diag::note_partial_spec_unused_parameter)
6025 << Param->getDeclName();
6026 else
Mike Stump1eb44332009-09-09 15:08:12 +00006027 Diag(Param->getLocation(),
Douglas Gregor031a5882009-06-13 00:26:55 +00006028 diag::note_partial_spec_unused_parameter)
Benjamin Kramer476d8b82010-08-11 14:47:12 +00006029 << "<anonymous>";
Douglas Gregor031a5882009-06-13 00:26:55 +00006030 }
6031 }
6032 }
Douglas Gregorcc636682009-02-17 23:15:12 +00006033 } else {
6034 // Create a new class template specialization declaration node for
Douglas Gregorfc9cd612009-09-26 20:57:03 +00006035 // this explicit specialization or friend declaration.
Douglas Gregorcc636682009-02-17 23:15:12 +00006036 Specialization
Douglas Gregor13c85772010-05-06 00:28:52 +00006037 = ClassTemplateSpecializationDecl::Create(Context, Kind,
Douglas Gregorcc636682009-02-17 23:15:12 +00006038 ClassTemplate->getDeclContext(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00006039 KWLoc, TemplateNameLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00006040 ClassTemplate,
Douglas Gregor910f8002010-11-07 23:05:16 +00006041 Converted.data(),
6042 Converted.size(),
Douglas Gregorcc636682009-02-17 23:15:12 +00006043 PrevDecl);
John McCallb6217662010-03-15 10:12:16 +00006044 SetNestedNameSpecifier(Specialization, SS);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00006045 if (TemplateParameterLists.size() > 0) {
Douglas Gregorc722ea42010-06-15 17:44:38 +00006046 Specialization->setTemplateParameterListsInfo(Context,
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00006047 TemplateParameterLists.size(),
Benjamin Kramer5354e772012-08-23 23:38:35 +00006048 TemplateParameterLists.data());
Abramo Bagnara9b934882010-06-12 08:15:14 +00006049 }
Douglas Gregorcc636682009-02-17 23:15:12 +00006050
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00006051 if (!PrevDecl)
6052 ClassTemplate->AddSpecialization(Specialization, InsertPos);
Douglas Gregorb88e8882009-07-30 17:40:51 +00006053
6054 CanonType = Context.getTypeDeclType(Specialization);
Douglas Gregorcc636682009-02-17 23:15:12 +00006055 }
6056
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006057 // C++ [temp.expl.spec]p6:
6058 // If a template, a member template or the member of a class template is
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006059 // explicitly specialized then that specialization shall be declared
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006060 // before the first use of that specialization that would cause an implicit
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006061 // instantiation to take place, in every translation unit in which such a
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006062 // use occurs; no diagnostic is required.
6063 if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) {
Douglas Gregordc0a11c2010-02-26 06:03:23 +00006064 bool Okay = false;
Douglas Gregorf785a7d2012-01-14 15:55:47 +00006065 for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) {
Douglas Gregordc0a11c2010-02-26 06:03:23 +00006066 // Is there any previous explicit specialization declaration?
6067 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) {
6068 Okay = true;
6069 break;
6070 }
6071 }
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006072
Douglas Gregordc0a11c2010-02-26 06:03:23 +00006073 if (!Okay) {
6074 SourceRange Range(TemplateNameLoc, RAngleLoc);
6075 Diag(TemplateNameLoc, diag::err_specialization_after_instantiation)
6076 << Context.getTypeDeclType(Specialization) << Range;
6077
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006078 Diag(PrevDecl->getPointOfInstantiation(),
Douglas Gregordc0a11c2010-02-26 06:03:23 +00006079 diag::note_instantiation_required_here)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006080 << (PrevDecl->getTemplateSpecializationKind()
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006081 != TSK_ImplicitInstantiation);
Douglas Gregordc0a11c2010-02-26 06:03:23 +00006082 return true;
6083 }
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006084 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006085
Douglas Gregorfc9cd612009-09-26 20:57:03 +00006086 // If this is not a friend, note that this is an explicit specialization.
6087 if (TUK != TUK_Friend)
6088 Specialization->setSpecializationKind(TSK_ExplicitSpecialization);
Douglas Gregorcc636682009-02-17 23:15:12 +00006089
6090 // Check that this isn't a redefinition of this specialization.
John McCall0f434ec2009-07-31 02:45:11 +00006091 if (TUK == TUK_Definition) {
Douglas Gregor952b0172010-02-11 01:04:33 +00006092 if (RecordDecl *Def = Specialization->getDefinition()) {
Douglas Gregorcc636682009-02-17 23:15:12 +00006093 SourceRange Range(TemplateNameLoc, RAngleLoc);
Mike Stump1eb44332009-09-09 15:08:12 +00006094 Diag(TemplateNameLoc, diag::err_redefinition)
Douglas Gregorc8ab2562009-05-31 09:31:02 +00006095 << Context.getTypeDeclType(Specialization) << Range;
Douglas Gregorcc636682009-02-17 23:15:12 +00006096 Diag(Def->getLocation(), diag::note_previous_definition);
6097 Specialization->setInvalidDecl();
Douglas Gregor212e81c2009-03-25 00:13:59 +00006098 return true;
Douglas Gregorcc636682009-02-17 23:15:12 +00006099 }
6100 }
6101
John McCall7f1b9872010-12-18 03:30:47 +00006102 if (Attr)
6103 ProcessDeclAttributeList(S, Specialization, Attr);
6104
Richard Smith0652c352012-08-17 03:20:55 +00006105 // Add alignment attributes if necessary; these attributes are checked when
6106 // the ASTContext lays out the structure.
6107 if (TUK == TUK_Definition) {
6108 AddAlignmentAttributesForRecord(Specialization);
6109 AddMsStructLayoutForRecord(Specialization);
6110 }
6111
Douglas Gregord023aec2011-09-09 20:53:38 +00006112 if (ModulePrivateLoc.isValid())
6113 Diag(Specialization->getLocation(), diag::err_module_private_specialization)
6114 << (isPartialSpecialization? 1 : 0)
6115 << FixItHint::CreateRemoval(ModulePrivateLoc);
6116
Douglas Gregorfc705b82009-02-26 22:19:44 +00006117 // Build the fully-sugared type for this class template
6118 // specialization as the user wrote in the specialization
6119 // itself. This means that we'll pretty-print the type retrieved
6120 // from the specialization's declaration the way that the user
6121 // actually wrote the specialization, rather than formatting the
6122 // name based on the "canonical" representation used to store the
6123 // template arguments in the specialization.
John McCall3cb0ebd2010-03-10 03:28:59 +00006124 TypeSourceInfo *WrittenTy
6125 = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc,
6126 TemplateArgs, CanonType);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006127 if (TUK != TUK_Friend) {
Douglas Gregorfc9cd612009-09-26 20:57:03 +00006128 Specialization->setTypeAsWritten(WrittenTy);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00006129 Specialization->setTemplateKeywordLoc(TemplateKWLoc);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006130 }
Douglas Gregorcc636682009-02-17 23:15:12 +00006131
Douglas Gregor6bc9f7e2009-02-25 22:18:32 +00006132 // C++ [temp.expl.spec]p9:
6133 // A template explicit specialization is in the scope of the
6134 // namespace in which the template was defined.
6135 //
6136 // We actually implement this paragraph where we set the semantic
6137 // context (in the creation of the ClassTemplateSpecializationDecl),
6138 // but we also maintain the lexical context where the actual
6139 // definition occurs.
Douglas Gregorcc636682009-02-17 23:15:12 +00006140 Specialization->setLexicalDeclContext(CurContext);
Mike Stump1eb44332009-09-09 15:08:12 +00006141
Douglas Gregorcc636682009-02-17 23:15:12 +00006142 // We may be starting the definition of this specialization.
John McCall0f434ec2009-07-31 02:45:11 +00006143 if (TUK == TUK_Definition)
Douglas Gregorcc636682009-02-17 23:15:12 +00006144 Specialization->startDefinition();
6145
Douglas Gregorfc9cd612009-09-26 20:57:03 +00006146 if (TUK == TUK_Friend) {
6147 FriendDecl *Friend = FriendDecl::Create(Context, CurContext,
6148 TemplateNameLoc,
John McCall32f2fb52010-03-25 18:04:51 +00006149 WrittenTy,
Douglas Gregorfc9cd612009-09-26 20:57:03 +00006150 /*FIXME:*/KWLoc);
6151 Friend->setAccess(AS_public);
6152 CurContext->addDecl(Friend);
6153 } else {
6154 // Add the specialization into its lexical context, so that it can
6155 // be seen when iterating through the list of declarations in that
6156 // context. However, specializations are not found by name lookup.
6157 CurContext->addDecl(Specialization);
6158 }
John McCalld226f652010-08-21 09:40:31 +00006159 return Specialization;
Douglas Gregorcc636682009-02-17 23:15:12 +00006160}
Douglas Gregord57959a2009-03-27 23:10:48 +00006161
John McCalld226f652010-08-21 09:40:31 +00006162Decl *Sema::ActOnTemplateDeclarator(Scope *S,
Douglas Gregore542c862009-06-23 23:11:28 +00006163 MultiTemplateParamsArg TemplateParameterLists,
John McCalld226f652010-08-21 09:40:31 +00006164 Declarator &D) {
Benjamin Kramer3fe198b2012-08-23 21:35:17 +00006165 Decl *NewDecl = HandleDeclarator(S, D, TemplateParameterLists);
Dmitri Gribenko96b09862012-07-31 22:37:06 +00006166 ActOnDocumentableDecl(NewDecl);
6167 return NewDecl;
Douglas Gregore542c862009-06-23 23:11:28 +00006168}
6169
John McCalld226f652010-08-21 09:40:31 +00006170Decl *Sema::ActOnStartOfFunctionTemplateDef(Scope *FnBodyScope,
Douglas Gregor52591bf2009-06-24 00:54:41 +00006171 MultiTemplateParamsArg TemplateParameterLists,
John McCalld226f652010-08-21 09:40:31 +00006172 Declarator &D) {
Douglas Gregor52591bf2009-06-24 00:54:41 +00006173 assert(getCurFunctionDecl() == 0 && "Function parsing confused");
Abramo Bagnara075f8f12010-12-10 16:29:40 +00006174 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
Mike Stump1eb44332009-09-09 15:08:12 +00006175
Douglas Gregor52591bf2009-06-24 00:54:41 +00006176 if (FTI.hasPrototype) {
Mike Stump1eb44332009-09-09 15:08:12 +00006177 // FIXME: Diagnose arguments without names in C.
Douglas Gregor52591bf2009-06-24 00:54:41 +00006178 }
Mike Stump1eb44332009-09-09 15:08:12 +00006179
Douglas Gregor52591bf2009-06-24 00:54:41 +00006180 Scope *ParentScope = FnBodyScope->getParent();
Mike Stump1eb44332009-09-09 15:08:12 +00006181
Douglas Gregor45fa5602011-11-07 20:56:01 +00006182 D.setFunctionDefinitionKind(FDK_Definition);
John McCalld226f652010-08-21 09:40:31 +00006183 Decl *DP = HandleDeclarator(ParentScope, D,
Benjamin Kramer3fe198b2012-08-23 21:35:17 +00006184 TemplateParameterLists);
Argyrios Kyrtzidis3abc7682012-12-14 06:53:58 +00006185 return ActOnStartOfFunctionDef(FnBodyScope, DP);
Douglas Gregor52591bf2009-06-24 00:54:41 +00006186}
6187
John McCall75042392010-02-11 01:33:53 +00006188/// \brief Strips various properties off an implicit instantiation
6189/// that has just been explicitly specialized.
6190static void StripImplicitInstantiation(NamedDecl *D) {
Sean Huntcf807c42010-08-18 23:23:40 +00006191 D->dropAttrs();
John McCall75042392010-02-11 01:33:53 +00006192
6193 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
6194 FD->setInlineSpecified(false);
Jordan Rose09189892013-03-08 22:25:36 +00006195
6196 for (FunctionDecl::param_iterator I = FD->param_begin(),
6197 E = FD->param_end();
6198 I != E; ++I)
6199 (*I)->dropAttrs();
John McCall75042392010-02-11 01:33:53 +00006200 }
6201}
6202
Nico Weberd1d512a2012-01-09 19:52:25 +00006203/// \brief Compute the diagnostic location for an explicit instantiation
6204// declaration or definition.
6205static SourceLocation DiagLocForExplicitInstantiation(
Douglas Gregorf785a7d2012-01-14 15:55:47 +00006206 NamedDecl* D, SourceLocation PointOfInstantiation) {
Nico Weberd1d512a2012-01-09 19:52:25 +00006207 // Explicit instantiations following a specialization have no effect and
6208 // hence no PointOfInstantiation. In that case, walk decl backwards
6209 // until a valid name loc is found.
6210 SourceLocation PrevDiagLoc = PointOfInstantiation;
Douglas Gregorf785a7d2012-01-14 15:55:47 +00006211 for (Decl *Prev = D; Prev && !PrevDiagLoc.isValid();
6212 Prev = Prev->getPreviousDecl()) {
Nico Weberd1d512a2012-01-09 19:52:25 +00006213 PrevDiagLoc = Prev->getLocation();
6214 }
6215 assert(PrevDiagLoc.isValid() &&
6216 "Explicit instantiation without point of instantiation?");
6217 return PrevDiagLoc;
6218}
6219
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006220/// \brief Diagnose cases where we have an explicit template specialization
Douglas Gregor454885e2009-10-15 15:54:05 +00006221/// before/after an explicit template instantiation, producing diagnostics
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006222/// for those cases where they are required and determining whether the
Douglas Gregor454885e2009-10-15 15:54:05 +00006223/// new specialization/instantiation will have any effect.
6224///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006225/// \param NewLoc the location of the new explicit specialization or
Douglas Gregor454885e2009-10-15 15:54:05 +00006226/// instantiation.
6227///
6228/// \param NewTSK the kind of the new explicit specialization or instantiation.
6229///
6230/// \param PrevDecl the previous declaration of the entity.
6231///
6232/// \param PrevTSK the kind of the old explicit specialization or instantiatin.
6233///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006234/// \param PrevPointOfInstantiation if valid, indicates where the previus
Douglas Gregor454885e2009-10-15 15:54:05 +00006235/// declaration was instantiated (either implicitly or explicitly).
6236///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006237/// \param HasNoEffect will be set to true to indicate that the new
Douglas Gregor454885e2009-10-15 15:54:05 +00006238/// specialization or instantiation has no effect and should be ignored.
6239///
6240/// \returns true if there was an error that should prevent the introduction of
6241/// the new declaration into the AST, false otherwise.
Douglas Gregor0d035142009-10-27 18:42:08 +00006242bool
6243Sema::CheckSpecializationInstantiationRedecl(SourceLocation NewLoc,
6244 TemplateSpecializationKind NewTSK,
6245 NamedDecl *PrevDecl,
6246 TemplateSpecializationKind PrevTSK,
6247 SourceLocation PrevPointOfInstantiation,
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006248 bool &HasNoEffect) {
6249 HasNoEffect = false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006250
Douglas Gregor454885e2009-10-15 15:54:05 +00006251 switch (NewTSK) {
6252 case TSK_Undeclared:
6253 case TSK_ImplicitInstantiation:
David Blaikieb219cfc2011-09-23 05:06:16 +00006254 llvm_unreachable("Don't check implicit instantiations here");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006255
Douglas Gregor454885e2009-10-15 15:54:05 +00006256 case TSK_ExplicitSpecialization:
6257 switch (PrevTSK) {
6258 case TSK_Undeclared:
6259 case TSK_ExplicitSpecialization:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006260 // Okay, we're just specializing something that is either already
Douglas Gregor454885e2009-10-15 15:54:05 +00006261 // explicitly specialized or has merely been mentioned without any
6262 // instantiation.
6263 return false;
6264
6265 case TSK_ImplicitInstantiation:
6266 if (PrevPointOfInstantiation.isInvalid()) {
6267 // The declaration itself has not actually been instantiated, so it is
6268 // still okay to specialize it.
John McCall75042392010-02-11 01:33:53 +00006269 StripImplicitInstantiation(PrevDecl);
Douglas Gregor454885e2009-10-15 15:54:05 +00006270 return false;
6271 }
6272 // Fall through
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006273
Douglas Gregor454885e2009-10-15 15:54:05 +00006274 case TSK_ExplicitInstantiationDeclaration:
6275 case TSK_ExplicitInstantiationDefinition:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006276 assert((PrevTSK == TSK_ImplicitInstantiation ||
6277 PrevPointOfInstantiation.isValid()) &&
Douglas Gregor454885e2009-10-15 15:54:05 +00006278 "Explicit instantiation without point of instantiation?");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006279
Douglas Gregor454885e2009-10-15 15:54:05 +00006280 // C++ [temp.expl.spec]p6:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006281 // If a template, a member template or the member of a class template
Douglas Gregor454885e2009-10-15 15:54:05 +00006282 // is explicitly specialized then that specialization shall be declared
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006283 // before the first use of that specialization that would cause an
Douglas Gregor454885e2009-10-15 15:54:05 +00006284 // implicit instantiation to take place, in every translation unit in
6285 // which such a use occurs; no diagnostic is required.
Douglas Gregorf785a7d2012-01-14 15:55:47 +00006286 for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) {
Douglas Gregordc0a11c2010-02-26 06:03:23 +00006287 // Is there any previous explicit specialization declaration?
6288 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization)
6289 return false;
6290 }
6291
Douglas Gregor0d035142009-10-27 18:42:08 +00006292 Diag(NewLoc, diag::err_specialization_after_instantiation)
Douglas Gregor454885e2009-10-15 15:54:05 +00006293 << PrevDecl;
Douglas Gregor0d035142009-10-27 18:42:08 +00006294 Diag(PrevPointOfInstantiation, diag::note_instantiation_required_here)
Douglas Gregor454885e2009-10-15 15:54:05 +00006295 << (PrevTSK != TSK_ImplicitInstantiation);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006296
Douglas Gregor454885e2009-10-15 15:54:05 +00006297 return true;
6298 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006299
Douglas Gregor454885e2009-10-15 15:54:05 +00006300 case TSK_ExplicitInstantiationDeclaration:
6301 switch (PrevTSK) {
6302 case TSK_ExplicitInstantiationDeclaration:
6303 // This explicit instantiation declaration is redundant (that's okay).
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006304 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00006305 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006306
Douglas Gregor454885e2009-10-15 15:54:05 +00006307 case TSK_Undeclared:
6308 case TSK_ImplicitInstantiation:
6309 // We're explicitly instantiating something that may have already been
6310 // implicitly instantiated; that's fine.
6311 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006312
Douglas Gregor454885e2009-10-15 15:54:05 +00006313 case TSK_ExplicitSpecialization:
6314 // C++0x [temp.explicit]p4:
6315 // For a given set of template parameters, if an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006316 // of a template appears after a declaration of an explicit
Douglas Gregor454885e2009-10-15 15:54:05 +00006317 // specialization for that template, the explicit instantiation has no
6318 // effect.
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006319 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00006320 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006321
Douglas Gregor454885e2009-10-15 15:54:05 +00006322 case TSK_ExplicitInstantiationDefinition:
6323 // C++0x [temp.explicit]p10:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006324 // If an entity is the subject of both an explicit instantiation
6325 // declaration and an explicit instantiation definition in the same
Douglas Gregor454885e2009-10-15 15:54:05 +00006326 // translation unit, the definition shall follow the declaration.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006327 Diag(NewLoc,
Douglas Gregor0d035142009-10-27 18:42:08 +00006328 diag::err_explicit_instantiation_declaration_after_definition);
Nico Weberff91d242011-12-23 20:58:04 +00006329
6330 // Explicit instantiations following a specialization have no effect and
6331 // hence no PrevPointOfInstantiation. In that case, walk decl backwards
6332 // until a valid name loc is found.
Nico Weberd1d512a2012-01-09 19:52:25 +00006333 Diag(DiagLocForExplicitInstantiation(PrevDecl, PrevPointOfInstantiation),
6334 diag::note_explicit_instantiation_definition_here);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006335 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00006336 return false;
6337 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006338
Douglas Gregor454885e2009-10-15 15:54:05 +00006339 case TSK_ExplicitInstantiationDefinition:
6340 switch (PrevTSK) {
6341 case TSK_Undeclared:
6342 case TSK_ImplicitInstantiation:
6343 // We're explicitly instantiating something that may have already been
6344 // implicitly instantiated; that's fine.
6345 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006346
Douglas Gregor454885e2009-10-15 15:54:05 +00006347 case TSK_ExplicitSpecialization:
6348 // C++ DR 259, C++0x [temp.explicit]p4:
6349 // For a given set of template parameters, if an explicit
6350 // instantiation of a template appears after a declaration of
6351 // an explicit specialization for that template, the explicit
6352 // instantiation has no effect.
6353 //
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006354 // In C++98/03 mode, we only give an extension warning here, because it
Douglas Gregorc42b6522010-04-09 21:02:29 +00006355 // is not harmful to try to explicitly instantiate something that
Douglas Gregor454885e2009-10-15 15:54:05 +00006356 // has been explicitly specialized.
Richard Smith80ad52f2013-01-02 11:42:31 +00006357 Diag(NewLoc, getLangOpts().CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00006358 diag::warn_cxx98_compat_explicit_instantiation_after_specialization :
6359 diag::ext_explicit_instantiation_after_specialization)
6360 << PrevDecl;
6361 Diag(PrevDecl->getLocation(),
6362 diag::note_previous_template_specialization);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006363 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00006364 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006365
Douglas Gregor454885e2009-10-15 15:54:05 +00006366 case TSK_ExplicitInstantiationDeclaration:
6367 // We're explicity instantiating a definition for something for which we
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006368 // were previously asked to suppress instantiations. That's fine.
Nico Weberff91d242011-12-23 20:58:04 +00006369
6370 // C++0x [temp.explicit]p4:
6371 // For a given set of template parameters, if an explicit instantiation
6372 // of a template appears after a declaration of an explicit
6373 // specialization for that template, the explicit instantiation has no
6374 // effect.
Douglas Gregorf785a7d2012-01-14 15:55:47 +00006375 for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) {
Nico Weberff91d242011-12-23 20:58:04 +00006376 // Is there any previous explicit specialization declaration?
6377 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) {
6378 HasNoEffect = true;
6379 break;
6380 }
6381 }
6382
Douglas Gregor454885e2009-10-15 15:54:05 +00006383 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006384
Douglas Gregor454885e2009-10-15 15:54:05 +00006385 case TSK_ExplicitInstantiationDefinition:
6386 // C++0x [temp.spec]p5:
6387 // For a given template and a given set of template-arguments,
6388 // - an explicit instantiation definition shall appear at most once
6389 // in a program,
Douglas Gregor0d035142009-10-27 18:42:08 +00006390 Diag(NewLoc, diag::err_explicit_instantiation_duplicate)
Douglas Gregor454885e2009-10-15 15:54:05 +00006391 << PrevDecl;
Nico Weberd1d512a2012-01-09 19:52:25 +00006392 Diag(DiagLocForExplicitInstantiation(PrevDecl, PrevPointOfInstantiation),
Douglas Gregor0d035142009-10-27 18:42:08 +00006393 diag::note_previous_explicit_instantiation);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006394 HasNoEffect = true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006395 return false;
Douglas Gregor454885e2009-10-15 15:54:05 +00006396 }
Douglas Gregor454885e2009-10-15 15:54:05 +00006397 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006398
David Blaikieb219cfc2011-09-23 05:06:16 +00006399 llvm_unreachable("Missing specialization/instantiation case?");
Douglas Gregor454885e2009-10-15 15:54:05 +00006400}
6401
John McCallaf2094e2010-04-08 09:05:18 +00006402/// \brief Perform semantic analysis for the given dependent function
James Dennettef2b5b32012-06-15 22:23:43 +00006403/// template specialization.
John McCallaf2094e2010-04-08 09:05:18 +00006404///
James Dennettef2b5b32012-06-15 22:23:43 +00006405/// The only possible way to get a dependent function template specialization
6406/// is with a friend declaration, like so:
6407///
6408/// \code
6409/// template \<class T> void foo(T);
6410/// template \<class T> class A {
John McCallaf2094e2010-04-08 09:05:18 +00006411/// friend void foo<>(T);
6412/// };
James Dennettef2b5b32012-06-15 22:23:43 +00006413/// \endcode
John McCallaf2094e2010-04-08 09:05:18 +00006414///
6415/// There really isn't any useful analysis we can do here, so we
6416/// just store the information.
6417bool
6418Sema::CheckDependentFunctionTemplateSpecialization(FunctionDecl *FD,
6419 const TemplateArgumentListInfo &ExplicitTemplateArgs,
6420 LookupResult &Previous) {
6421 // Remove anything from Previous that isn't a function template in
6422 // the correct context.
Sebastian Redl7a126a42010-08-31 00:36:30 +00006423 DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext();
John McCallaf2094e2010-04-08 09:05:18 +00006424 LookupResult::Filter F = Previous.makeFilter();
6425 while (F.hasNext()) {
6426 NamedDecl *D = F.next()->getUnderlyingDecl();
6427 if (!isa<FunctionTemplateDecl>(D) ||
Sebastian Redl7a126a42010-08-31 00:36:30 +00006428 !FDLookupContext->InEnclosingNamespaceSetOf(
6429 D->getDeclContext()->getRedeclContext()))
John McCallaf2094e2010-04-08 09:05:18 +00006430 F.erase();
6431 }
6432 F.done();
6433
6434 // Should this be diagnosed here?
6435 if (Previous.empty()) return true;
6436
6437 FD->setDependentTemplateSpecialization(Context, Previous.asUnresolvedSet(),
6438 ExplicitTemplateArgs);
6439 return false;
6440}
6441
Abramo Bagnarae03db982010-05-20 15:32:11 +00006442/// \brief Perform semantic analysis for the given function template
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006443/// specialization.
6444///
Abramo Bagnarae03db982010-05-20 15:32:11 +00006445/// This routine performs all of the semantic analysis required for an
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006446/// explicit function template specialization. On successful completion,
6447/// the function declaration \p FD will become a function template
6448/// specialization.
6449///
6450/// \param FD the function declaration, which will be updated to become a
6451/// function template specialization.
6452///
Abramo Bagnarae03db982010-05-20 15:32:11 +00006453/// \param ExplicitTemplateArgs the explicitly-provided template arguments,
6454/// if any. Note that this may be valid info even when 0 arguments are
6455/// explicitly provided as in, e.g., \c void sort<>(char*, char*);
6456/// as it anyway contains info on the angle brackets locations.
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006457///
Francois Pichet59e7c562011-07-08 06:21:47 +00006458/// \param Previous the set of declarations that may be specialized by
Abramo Bagnarae03db982010-05-20 15:32:11 +00006459/// this function specialization.
Larisse Voufo43847122013-07-19 23:00:19 +00006460bool Sema::CheckFunctionTemplateSpecialization(
6461 FunctionDecl *FD, TemplateArgumentListInfo *ExplicitTemplateArgs,
6462 LookupResult &Previous) {
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006463 // The set of function template specializations that could match this
6464 // explicit function template specialization.
John McCallc373d482010-01-27 01:50:18 +00006465 UnresolvedSet<8> Candidates;
Larisse Voufo43847122013-07-19 23:00:19 +00006466 TemplateSpecCandidateSet FailedCandidates(FD->getLocation());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006467
Sebastian Redl7a126a42010-08-31 00:36:30 +00006468 DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext();
John McCall68263142009-11-18 22:49:29 +00006469 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
6470 I != E; ++I) {
6471 NamedDecl *Ovl = (*I)->getUnderlyingDecl();
6472 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Ovl)) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006473 // Only consider templates found within the same semantic lookup scope as
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006474 // FD.
Sebastian Redl7a126a42010-08-31 00:36:30 +00006475 if (!FDLookupContext->InEnclosingNamespaceSetOf(
6476 Ovl->getDeclContext()->getRedeclContext()))
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006477 continue;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006478
Richard Smith21c8fa82013-01-14 05:37:29 +00006479 // When matching a constexpr member function template specialization
6480 // against the primary template, we don't yet know whether the
6481 // specialization has an implicit 'const' (because we don't know whether
6482 // it will be a static member function until we know which template it
6483 // specializes), so adjust it now assuming it specializes this template.
6484 QualType FT = FD->getType();
Reid Kleckner35bc0052013-09-10 01:04:45 +00006485 const FunctionProtoType *FPT = FT->castAs<FunctionProtoType>();
6486 FunctionDecl *TmplFD = FunTmpl->getTemplatedDecl();
Richard Smith21c8fa82013-01-14 05:37:29 +00006487 if (FD->isConstexpr()) {
Reid Kleckner35bc0052013-09-10 01:04:45 +00006488 CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(TmplFD);
Richard Smith21c8fa82013-01-14 05:37:29 +00006489 if (OldMD && OldMD->isConst()) {
Richard Smith21c8fa82013-01-14 05:37:29 +00006490 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
6491 EPI.TypeQuals |= Qualifiers::Const;
Reid Kleckner0567a792013-06-10 20:51:09 +00006492 FT = Context.getFunctionType(FPT->getResultType(), FPT->getArgTypes(),
Jordan Rosebea522f2013-03-08 21:51:21 +00006493 EPI);
Richard Smith21c8fa82013-01-14 05:37:29 +00006494 }
6495 }
6496
Reid Klecknere8bcd4c2013-09-10 22:21:37 +00006497 // Ignore differences in calling convention and noreturn until decl
6498 // merging.
Reid Kleckner35bc0052013-09-10 01:04:45 +00006499 const FunctionProtoType *TmplFT =
6500 TmplFD->getType()->castAs<FunctionProtoType>();
Reid Klecknere8bcd4c2013-09-10 22:21:37 +00006501 if (FPT->getCallConv() != TmplFT->getCallConv() ||
6502 FPT->getNoReturnAttr() != TmplFT->getNoReturnAttr()) {
Reid Kleckner35bc0052013-09-10 01:04:45 +00006503 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
6504 EPI.ExtInfo = EPI.ExtInfo.withCallingConv(TmplFT->getCallConv());
Reid Klecknere8bcd4c2013-09-10 22:21:37 +00006505 EPI.ExtInfo = EPI.ExtInfo.withNoReturn(TmplFT->getNoReturnAttr());
Reid Kleckner35bc0052013-09-10 01:04:45 +00006506 FT = Context.getFunctionType(FPT->getResultType(), FPT->getArgTypes(),
6507 EPI);
6508 }
6509
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006510 // C++ [temp.expl.spec]p11:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006511 // A trailing template-argument can be left unspecified in the
6512 // template-id naming an explicit function template specialization
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006513 // provided it can be deduced from the function argument type.
6514 // Perform template argument deduction to determine whether we may be
6515 // specializing this template.
6516 // FIXME: It is somewhat wasteful to build
Larisse Voufo43847122013-07-19 23:00:19 +00006517 TemplateDeductionInfo Info(FailedCandidates.getLocation());
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006518 FunctionDecl *Specialization = 0;
6519 if (TemplateDeductionResult TDK
Richard Smith21c8fa82013-01-14 05:37:29 +00006520 = DeduceTemplateArguments(FunTmpl, ExplicitTemplateArgs, FT,
6521 Specialization, Info)) {
Larisse Voufo43847122013-07-19 23:00:19 +00006522 // Template argument deduction failed; record why it failed, so
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006523 // that we can provide nifty diagnostics.
Larisse Voufo43847122013-07-19 23:00:19 +00006524 FailedCandidates.addCandidate()
6525 .set(FunTmpl->getTemplatedDecl(),
6526 MakeDeductionFailureInfo(Context, TDK, Info));
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006527 (void)TDK;
6528 continue;
6529 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006530
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006531 // Record this candidate.
John McCallc373d482010-01-27 01:50:18 +00006532 Candidates.addDecl(Specialization, I.getAccess());
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006533 }
6534 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006535
Douglas Gregorc5df30f2009-09-26 03:41:46 +00006536 // Find the most specialized function template.
Larisse Voufo43847122013-07-19 23:00:19 +00006537 UnresolvedSetIterator Result = getMostSpecialized(
Richard Smith4ad09e62013-09-10 22:59:25 +00006538 Candidates.begin(), Candidates.end(), FailedCandidates,
Larisse Voufo43847122013-07-19 23:00:19 +00006539 FD->getLocation(),
6540 PDiag(diag::err_function_template_spec_no_match) << FD->getDeclName(),
6541 PDiag(diag::err_function_template_spec_ambiguous)
6542 << FD->getDeclName() << (ExplicitTemplateArgs != 0),
6543 PDiag(diag::note_function_template_spec_matched));
6544
John McCallc373d482010-01-27 01:50:18 +00006545 if (Result == Candidates.end())
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006546 return true;
John McCallc373d482010-01-27 01:50:18 +00006547
6548 // Ignore access information; it doesn't figure into redeclaration checking.
6549 FunctionDecl *Specialization = cast<FunctionDecl>(*Result);
Abramo Bagnaraabfb4052011-03-04 17:20:30 +00006550
6551 FunctionTemplateSpecializationInfo *SpecInfo
6552 = Specialization->getTemplateSpecializationInfo();
6553 assert(SpecInfo && "Function template specialization info missing?");
Francois Pichet59e7c562011-07-08 06:21:47 +00006554
6555 // Note: do not overwrite location info if previous template
6556 // specialization kind was explicit.
6557 TemplateSpecializationKind TSK = SpecInfo->getTemplateSpecializationKind();
Richard Smithff234882012-02-20 23:28:05 +00006558 if (TSK == TSK_Undeclared || TSK == TSK_ImplicitInstantiation) {
Francois Pichet59e7c562011-07-08 06:21:47 +00006559 Specialization->setLocation(FD->getLocation());
Richard Smithff234882012-02-20 23:28:05 +00006560 // C++11 [dcl.constexpr]p1: An explicit specialization of a constexpr
6561 // function can differ from the template declaration with respect to
6562 // the constexpr specifier.
6563 Specialization->setConstexpr(FD->isConstexpr());
6564 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006565
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006566 // FIXME: Check if the prior specialization has a point of instantiation.
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006567 // If so, we have run afoul of .
John McCall7ad650f2010-03-24 07:46:06 +00006568
6569 // If this is a friend declaration, then we're not really declaring
6570 // an explicit specialization.
6571 bool isFriend = (FD->getFriendObjectKind() != Decl::FOK_None);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006572
Douglas Gregord5cb8762009-10-07 00:13:32 +00006573 // Check the scope of this explicit specialization.
John McCall7ad650f2010-03-24 07:46:06 +00006574 if (!isFriend &&
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006575 CheckTemplateSpecializationScope(*this,
Douglas Gregord5cb8762009-10-07 00:13:32 +00006576 Specialization->getPrimaryTemplate(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006577 Specialization, FD->getLocation(),
Douglas Gregor9302da62009-10-14 23:50:59 +00006578 false))
Douglas Gregord5cb8762009-10-07 00:13:32 +00006579 return true;
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006580
6581 // C++ [temp.expl.spec]p6:
6582 // If a template, a member template or the member of a class template is
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006583 // explicitly specialized then that specialization shall be declared
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006584 // before the first use of that specialization that would cause an implicit
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006585 // instantiation to take place, in every translation unit in which such a
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006586 // use occurs; no diagnostic is required.
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006587 bool HasNoEffect = false;
John McCall7ad650f2010-03-24 07:46:06 +00006588 if (!isFriend &&
6589 CheckSpecializationInstantiationRedecl(FD->getLocation(),
John McCall75042392010-02-11 01:33:53 +00006590 TSK_ExplicitSpecialization,
6591 Specialization,
6592 SpecInfo->getTemplateSpecializationKind(),
6593 SpecInfo->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006594 HasNoEffect))
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006595 return true;
Douglas Gregore885e182011-05-21 18:53:30 +00006596
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006597 // Mark the prior declaration as an explicit specialization, so that later
6598 // clients know that this is an explicit specialization.
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00006599 if (!isFriend) {
John McCall7ad650f2010-03-24 07:46:06 +00006600 SpecInfo->setTemplateSpecializationKind(TSK_ExplicitSpecialization);
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00006601 MarkUnusedFileScopedDecl(Specialization);
6602 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006603
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006604 // Turn the given function declaration into a function template
6605 // specialization, with the template arguments from the previous
6606 // specialization.
Abramo Bagnarae03db982010-05-20 15:32:11 +00006607 // Take copies of (semantic and syntactic) template argument lists.
6608 const TemplateArgumentList* TemplArgs = new (Context)
6609 TemplateArgumentList(Specialization->getTemplateSpecializationArgs());
Douglas Gregor838db382010-02-11 01:19:42 +00006610 FD->setFunctionTemplateSpecialization(Specialization->getPrimaryTemplate(),
Abramo Bagnarae03db982010-05-20 15:32:11 +00006611 TemplArgs, /*InsertPos=*/0,
6612 SpecInfo->getTemplateSpecializationKind(),
Argyrios Kyrtzidis71a76052011-09-22 20:07:09 +00006613 ExplicitTemplateArgs);
Rafael Espindolad2615cc2013-04-03 19:27:57 +00006614
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006615 // The "previous declaration" for this function template specialization is
6616 // the prior function template specialization.
John McCall68263142009-11-18 22:49:29 +00006617 Previous.clear();
6618 Previous.addDecl(Specialization);
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006619 return false;
6620}
6621
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006622/// \brief Perform semantic analysis for the given non-template member
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006623/// specialization.
6624///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006625/// This routine performs all of the semantic analysis required for an
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006626/// explicit member function specialization. On successful completion,
6627/// the function declaration \p FD will become a member function
6628/// specialization.
6629///
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006630/// \param Member the member declaration, which will be updated to become a
6631/// specialization.
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006632///
John McCall68263142009-11-18 22:49:29 +00006633/// \param Previous the set of declarations, one of which may be specialized
6634/// by this function specialization; the set will be modified to contain the
6635/// redeclared member.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006636bool
John McCall68263142009-11-18 22:49:29 +00006637Sema::CheckMemberSpecialization(NamedDecl *Member, LookupResult &Previous) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006638 assert(!isa<TemplateDecl>(Member) && "Only for non-template members");
John McCall77e8b112010-04-13 20:37:33 +00006639
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006640 // Try to find the member we are instantiating.
6641 NamedDecl *Instantiation = 0;
6642 NamedDecl *InstantiatedFrom = 0;
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006643 MemberSpecializationInfo *MSInfo = 0;
6644
John McCall68263142009-11-18 22:49:29 +00006645 if (Previous.empty()) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006646 // Nowhere to look anyway.
6647 } else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Member)) {
John McCall68263142009-11-18 22:49:29 +00006648 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
6649 I != E; ++I) {
6650 NamedDecl *D = (*I)->getUnderlyingDecl();
6651 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006652 if (Context.hasSameType(Function->getType(), Method->getType())) {
6653 Instantiation = Method;
6654 InstantiatedFrom = Method->getInstantiatedFromMemberFunction();
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006655 MSInfo = Method->getMemberSpecializationInfo();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006656 break;
6657 }
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006658 }
6659 }
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006660 } else if (isa<VarDecl>(Member)) {
John McCall68263142009-11-18 22:49:29 +00006661 VarDecl *PrevVar;
6662 if (Previous.isSingleResult() &&
6663 (PrevVar = dyn_cast<VarDecl>(Previous.getFoundDecl())))
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006664 if (PrevVar->isStaticDataMember()) {
John McCall68263142009-11-18 22:49:29 +00006665 Instantiation = PrevVar;
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006666 InstantiatedFrom = PrevVar->getInstantiatedFromStaticDataMember();
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006667 MSInfo = PrevVar->getMemberSpecializationInfo();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006668 }
6669 } else if (isa<RecordDecl>(Member)) {
John McCall68263142009-11-18 22:49:29 +00006670 CXXRecordDecl *PrevRecord;
6671 if (Previous.isSingleResult() &&
6672 (PrevRecord = dyn_cast<CXXRecordDecl>(Previous.getFoundDecl()))) {
6673 Instantiation = PrevRecord;
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006674 InstantiatedFrom = PrevRecord->getInstantiatedFromMemberClass();
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006675 MSInfo = PrevRecord->getMemberSpecializationInfo();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006676 }
Richard Smith1af83c42012-03-23 03:33:32 +00006677 } else if (isa<EnumDecl>(Member)) {
6678 EnumDecl *PrevEnum;
6679 if (Previous.isSingleResult() &&
6680 (PrevEnum = dyn_cast<EnumDecl>(Previous.getFoundDecl()))) {
6681 Instantiation = PrevEnum;
6682 InstantiatedFrom = PrevEnum->getInstantiatedFromMemberEnum();
6683 MSInfo = PrevEnum->getMemberSpecializationInfo();
6684 }
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006685 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006686
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006687 if (!Instantiation) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006688 // There is no previous declaration that matches. Since member
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006689 // specializations are always out-of-line, the caller will complain about
6690 // this mismatch later.
6691 return false;
6692 }
John McCall77e8b112010-04-13 20:37:33 +00006693
6694 // If this is a friend, just bail out here before we start turning
6695 // things into explicit specializations.
6696 if (Member->getFriendObjectKind() != Decl::FOK_None) {
6697 // Preserve instantiation information.
6698 if (InstantiatedFrom && isa<CXXMethodDecl>(Member)) {
6699 cast<CXXMethodDecl>(Member)->setInstantiationOfMemberFunction(
6700 cast<CXXMethodDecl>(InstantiatedFrom),
6701 cast<CXXMethodDecl>(Instantiation)->getTemplateSpecializationKind());
6702 } else if (InstantiatedFrom && isa<CXXRecordDecl>(Member)) {
6703 cast<CXXRecordDecl>(Member)->setInstantiationOfMemberClass(
6704 cast<CXXRecordDecl>(InstantiatedFrom),
6705 cast<CXXRecordDecl>(Instantiation)->getTemplateSpecializationKind());
6706 }
6707
6708 Previous.clear();
6709 Previous.addDecl(Instantiation);
6710 return false;
6711 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006712
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006713 // Make sure that this is a specialization of a member.
6714 if (!InstantiatedFrom) {
6715 Diag(Member->getLocation(), diag::err_spec_member_not_instantiated)
6716 << Member;
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006717 Diag(Instantiation->getLocation(), diag::note_specialized_decl);
6718 return true;
6719 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006720
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006721 // C++ [temp.expl.spec]p6:
6722 // If a template, a member template or the member of a class template is
Nico Weberff91d242011-12-23 20:58:04 +00006723 // explicitly specialized then that specialization shall be declared
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006724 // before the first use of that specialization that would cause an implicit
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006725 // instantiation to take place, in every translation unit in which such a
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006726 // use occurs; no diagnostic is required.
6727 assert(MSInfo && "Member specialization info missing?");
John McCall75042392010-02-11 01:33:53 +00006728
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006729 bool HasNoEffect = false;
John McCall75042392010-02-11 01:33:53 +00006730 if (CheckSpecializationInstantiationRedecl(Member->getLocation(),
6731 TSK_ExplicitSpecialization,
6732 Instantiation,
6733 MSInfo->getTemplateSpecializationKind(),
6734 MSInfo->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006735 HasNoEffect))
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006736 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006737
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006738 // Check the scope of this explicit specialization.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006739 if (CheckTemplateSpecializationScope(*this,
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006740 InstantiatedFrom,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006741 Instantiation, Member->getLocation(),
Douglas Gregor9302da62009-10-14 23:50:59 +00006742 false))
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006743 return true;
Douglas Gregor2db32322009-10-07 23:56:10 +00006744
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006745 // Note that this is an explicit instantiation of a member.
Douglas Gregorf6b11852009-10-08 15:14:33 +00006746 // the original declaration to note that it is an explicit specialization
6747 // (if it was previously an implicit instantiation). This latter step
6748 // makes bookkeeping easier.
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006749 if (isa<FunctionDecl>(Member)) {
Douglas Gregorf6b11852009-10-08 15:14:33 +00006750 FunctionDecl *InstantiationFunction = cast<FunctionDecl>(Instantiation);
6751 if (InstantiationFunction->getTemplateSpecializationKind() ==
6752 TSK_ImplicitInstantiation) {
6753 InstantiationFunction->setTemplateSpecializationKind(
6754 TSK_ExplicitSpecialization);
6755 InstantiationFunction->setLocation(Member->getLocation());
6756 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006757
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006758 cast<FunctionDecl>(Member)->setInstantiationOfMemberFunction(
6759 cast<CXXMethodDecl>(InstantiatedFrom),
6760 TSK_ExplicitSpecialization);
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00006761 MarkUnusedFileScopedDecl(InstantiationFunction);
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006762 } else if (isa<VarDecl>(Member)) {
Douglas Gregorf6b11852009-10-08 15:14:33 +00006763 VarDecl *InstantiationVar = cast<VarDecl>(Instantiation);
6764 if (InstantiationVar->getTemplateSpecializationKind() ==
6765 TSK_ImplicitInstantiation) {
6766 InstantiationVar->setTemplateSpecializationKind(
6767 TSK_ExplicitSpecialization);
6768 InstantiationVar->setLocation(Member->getLocation());
6769 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006770
Larisse Voufoef4579c2013-08-06 01:03:05 +00006771 cast<VarDecl>(Member)->setInstantiationOfStaticDataMember(
6772 cast<VarDecl>(InstantiatedFrom), TSK_ExplicitSpecialization);
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00006773 MarkUnusedFileScopedDecl(InstantiationVar);
Richard Smith1af83c42012-03-23 03:33:32 +00006774 } else if (isa<CXXRecordDecl>(Member)) {
Douglas Gregorf6b11852009-10-08 15:14:33 +00006775 CXXRecordDecl *InstantiationClass = cast<CXXRecordDecl>(Instantiation);
6776 if (InstantiationClass->getTemplateSpecializationKind() ==
6777 TSK_ImplicitInstantiation) {
6778 InstantiationClass->setTemplateSpecializationKind(
6779 TSK_ExplicitSpecialization);
6780 InstantiationClass->setLocation(Member->getLocation());
6781 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006782
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006783 cast<CXXRecordDecl>(Member)->setInstantiationOfMemberClass(
Douglas Gregorf6b11852009-10-08 15:14:33 +00006784 cast<CXXRecordDecl>(InstantiatedFrom),
6785 TSK_ExplicitSpecialization);
Richard Smith1af83c42012-03-23 03:33:32 +00006786 } else {
6787 assert(isa<EnumDecl>(Member) && "Only member enums remain");
6788 EnumDecl *InstantiationEnum = cast<EnumDecl>(Instantiation);
6789 if (InstantiationEnum->getTemplateSpecializationKind() ==
6790 TSK_ImplicitInstantiation) {
6791 InstantiationEnum->setTemplateSpecializationKind(
6792 TSK_ExplicitSpecialization);
6793 InstantiationEnum->setLocation(Member->getLocation());
6794 }
6795
6796 cast<EnumDecl>(Member)->setInstantiationOfMemberEnum(
6797 cast<EnumDecl>(InstantiatedFrom), TSK_ExplicitSpecialization);
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006798 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006799
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006800 // Save the caller the trouble of having to figure out which declaration
6801 // this specialization matches.
John McCall68263142009-11-18 22:49:29 +00006802 Previous.clear();
6803 Previous.addDecl(Instantiation);
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006804 return false;
6805}
6806
Douglas Gregor558c0322009-10-14 23:41:34 +00006807/// \brief Check the scope of an explicit instantiation.
Douglas Gregor669eed82010-07-13 00:10:04 +00006808///
6809/// \returns true if a serious error occurs, false otherwise.
6810static bool CheckExplicitInstantiationScope(Sema &S, NamedDecl *D,
Douglas Gregor558c0322009-10-14 23:41:34 +00006811 SourceLocation InstLoc,
6812 bool WasQualifiedName) {
Sebastian Redl7a126a42010-08-31 00:36:30 +00006813 DeclContext *OrigContext= D->getDeclContext()->getEnclosingNamespaceContext();
6814 DeclContext *CurContext = S.CurContext->getRedeclContext();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006815
Douglas Gregor669eed82010-07-13 00:10:04 +00006816 if (CurContext->isRecord()) {
6817 S.Diag(InstLoc, diag::err_explicit_instantiation_in_class)
6818 << D;
6819 return true;
6820 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006821
Richard Smith3e2e91e2011-10-18 02:28:33 +00006822 // C++11 [temp.explicit]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006823 // An explicit instantiation shall appear in an enclosing namespace of its
Richard Smith3e2e91e2011-10-18 02:28:33 +00006824 // template. If the name declared in the explicit instantiation is an
6825 // unqualified name, the explicit instantiation shall appear in the
6826 // namespace where its template is declared or, if that namespace is inline
6827 // (7.3.1), any namespace from its enclosing namespace set.
Douglas Gregor558c0322009-10-14 23:41:34 +00006828 //
6829 // This is DR275, which we do not retroactively apply to C++98/03.
Richard Smith3e2e91e2011-10-18 02:28:33 +00006830 if (WasQualifiedName) {
6831 if (CurContext->Encloses(OrigContext))
6832 return false;
6833 } else {
6834 if (CurContext->InEnclosingNamespaceSetOf(OrigContext))
6835 return false;
6836 }
6837
6838 if (NamespaceDecl *NS = dyn_cast<NamespaceDecl>(OrigContext)) {
6839 if (WasQualifiedName)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006840 S.Diag(InstLoc,
Richard Smith80ad52f2013-01-02 11:42:31 +00006841 S.getLangOpts().CPlusPlus11?
Richard Smith3e2e91e2011-10-18 02:28:33 +00006842 diag::err_explicit_instantiation_out_of_scope :
6843 diag::warn_explicit_instantiation_out_of_scope_0x)
Douglas Gregor558c0322009-10-14 23:41:34 +00006844 << D << NS;
6845 else
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006846 S.Diag(InstLoc,
Richard Smith80ad52f2013-01-02 11:42:31 +00006847 S.getLangOpts().CPlusPlus11?
Richard Smith3e2e91e2011-10-18 02:28:33 +00006848 diag::err_explicit_instantiation_unqualified_wrong_namespace :
6849 diag::warn_explicit_instantiation_unqualified_wrong_namespace_0x)
6850 << D << NS;
6851 } else
6852 S.Diag(InstLoc,
Richard Smith80ad52f2013-01-02 11:42:31 +00006853 S.getLangOpts().CPlusPlus11?
Richard Smith3e2e91e2011-10-18 02:28:33 +00006854 diag::err_explicit_instantiation_must_be_global :
6855 diag::warn_explicit_instantiation_must_be_global_0x)
6856 << D;
Douglas Gregor558c0322009-10-14 23:41:34 +00006857 S.Diag(D->getLocation(), diag::note_explicit_instantiation_here);
Douglas Gregor669eed82010-07-13 00:10:04 +00006858 return false;
Douglas Gregor558c0322009-10-14 23:41:34 +00006859}
6860
6861/// \brief Determine whether the given scope specifier has a template-id in it.
6862static bool ScopeSpecifierHasTemplateId(const CXXScopeSpec &SS) {
6863 if (!SS.isSet())
6864 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006865
Richard Smith3e2e91e2011-10-18 02:28:33 +00006866 // C++11 [temp.explicit]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006867 // If the explicit instantiation is for a member function, a member class
Douglas Gregor558c0322009-10-14 23:41:34 +00006868 // or a static data member of a class template specialization, the name of
6869 // the class template specialization in the qualified-id for the member
6870 // name shall be a simple-template-id.
6871 //
6872 // C++98 has the same restriction, just worded differently.
6873 for (NestedNameSpecifier *NNS = (NestedNameSpecifier *)SS.getScopeRep();
6874 NNS; NNS = NNS->getPrefix())
John McCallf4c73712011-01-19 06:33:43 +00006875 if (const Type *T = NNS->getAsType())
Douglas Gregor558c0322009-10-14 23:41:34 +00006876 if (isa<TemplateSpecializationType>(T))
6877 return true;
6878
6879 return false;
6880}
6881
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006882// Explicit instantiation of a class template specialization
John McCallf312b1e2010-08-26 23:41:50 +00006883DeclResult
Mike Stump1eb44332009-09-09 15:08:12 +00006884Sema::ActOnExplicitInstantiation(Scope *S,
Douglas Gregor45f96552009-09-04 06:33:52 +00006885 SourceLocation ExternLoc,
6886 SourceLocation TemplateLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00006887 unsigned TagSpec,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006888 SourceLocation KWLoc,
6889 const CXXScopeSpec &SS,
6890 TemplateTy TemplateD,
6891 SourceLocation TemplateNameLoc,
6892 SourceLocation LAngleLoc,
6893 ASTTemplateArgsPtr TemplateArgsIn,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006894 SourceLocation RAngleLoc,
6895 AttributeList *Attr) {
6896 // Find the class template we're specializing
Serge Pavlov18062392013-08-27 13:15:56 +00006897 TemplateName Name = TemplateD.get();
Richard Smithb1ce9292013-06-22 22:03:31 +00006898 TemplateDecl *TD = Name.getAsTemplateDecl();
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006899 // Check that the specialization uses the same tag kind as the
6900 // original template.
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006901 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
6902 assert(Kind != TTK_Enum &&
6903 "Invalid enum tag in class template explicit instantiation!");
Richard Smithb1ce9292013-06-22 22:03:31 +00006904
6905 if (isa<TypeAliasTemplateDecl>(TD)) {
6906 Diag(KWLoc, diag::err_tag_reference_non_tag) << Kind;
6907 Diag(TD->getTemplatedDecl()->getLocation(),
6908 diag::note_previous_use);
6909 return true;
6910 }
6911
6912 ClassTemplateDecl *ClassTemplate = cast<ClassTemplateDecl>(TD);
6913
Douglas Gregor501c5ce2009-05-14 16:41:31 +00006914 if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(),
Richard Trieubbf34c02011-06-10 03:11:26 +00006915 Kind, /*isDefinition*/false, KWLoc,
Douglas Gregor501c5ce2009-05-14 16:41:31 +00006916 *ClassTemplate->getIdentifier())) {
Mike Stump1eb44332009-09-09 15:08:12 +00006917 Diag(KWLoc, diag::err_use_with_wrong_tag)
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006918 << ClassTemplate
Douglas Gregor849b2432010-03-31 17:46:05 +00006919 << FixItHint::CreateReplacement(KWLoc,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006920 ClassTemplate->getTemplatedDecl()->getKindName());
Mike Stump1eb44332009-09-09 15:08:12 +00006921 Diag(ClassTemplate->getTemplatedDecl()->getLocation(),
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006922 diag::note_previous_use);
6923 Kind = ClassTemplate->getTemplatedDecl()->getTagKind();
6924 }
6925
Douglas Gregor558c0322009-10-14 23:41:34 +00006926 // C++0x [temp.explicit]p2:
6927 // There are two forms of explicit instantiation: an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006928 // definition and an explicit instantiation declaration. An explicit
6929 // instantiation declaration begins with the extern keyword. [...]
Douglas Gregord5cb8762009-10-07 00:13:32 +00006930 TemplateSpecializationKind TSK
6931 = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition
6932 : TSK_ExplicitInstantiationDeclaration;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006933
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006934 // Translate the parser's template argument list in our AST format.
John McCalld5532b62009-11-23 01:53:49 +00006935 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
Douglas Gregor314b97f2009-11-10 19:49:08 +00006936 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006937
6938 // Check that the template argument list is well-formed for this
6939 // template.
Chris Lattner5f9e2722011-07-23 10:55:15 +00006940 SmallVector<TemplateArgument, 4> Converted;
John McCalld5532b62009-11-23 01:53:49 +00006941 if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc,
6942 TemplateArgs, false, Converted))
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006943 return true;
6944
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006945 // Find the class template specialization declaration that
6946 // corresponds to these arguments.
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006947 void *InsertPos = 0;
6948 ClassTemplateSpecializationDecl *PrevDecl
Douglas Gregor910f8002010-11-07 23:05:16 +00006949 = ClassTemplate->findSpecialization(Converted.data(),
6950 Converted.size(), InsertPos);
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006951
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006952 TemplateSpecializationKind PrevDecl_TSK
6953 = PrevDecl ? PrevDecl->getTemplateSpecializationKind() : TSK_Undeclared;
6954
Douglas Gregord5cb8762009-10-07 00:13:32 +00006955 // C++0x [temp.explicit]p2:
6956 // [...] An explicit instantiation shall appear in an enclosing
6957 // namespace of its template. [...]
6958 //
6959 // This is C++ DR 275.
Douglas Gregor669eed82010-07-13 00:10:04 +00006960 if (CheckExplicitInstantiationScope(*this, ClassTemplate, TemplateNameLoc,
6961 SS.isSet()))
6962 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006963
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006964 ClassTemplateSpecializationDecl *Specialization = 0;
6965
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006966 bool HasNoEffect = false;
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006967 if (PrevDecl) {
Douglas Gregor0d035142009-10-27 18:42:08 +00006968 if (CheckSpecializationInstantiationRedecl(TemplateNameLoc, TSK,
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006969 PrevDecl, PrevDecl_TSK,
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006970 PrevDecl->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006971 HasNoEffect))
John McCalld226f652010-08-21 09:40:31 +00006972 return PrevDecl;
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006973
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006974 // Even though HasNoEffect == true means that this explicit instantiation
6975 // has no effect on semantics, we go on to put its syntax in the AST.
6976
6977 if (PrevDecl_TSK == TSK_ImplicitInstantiation ||
6978 PrevDecl_TSK == TSK_Undeclared) {
Douglas Gregor52604ab2009-09-11 21:19:12 +00006979 // Since the only prior class template specialization with these
6980 // arguments was referenced but not declared, reuse that
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006981 // declaration node as our own, updating the source location
6982 // for the template name to reflect our new declaration.
6983 // (Other source locations will be updated later.)
Douglas Gregor52604ab2009-09-11 21:19:12 +00006984 Specialization = PrevDecl;
6985 Specialization->setLocation(TemplateNameLoc);
6986 PrevDecl = 0;
6987 }
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006988 }
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006989
Douglas Gregor52604ab2009-09-11 21:19:12 +00006990 if (!Specialization) {
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006991 // Create a new class template specialization declaration node for
6992 // this explicit specialization.
6993 Specialization
Douglas Gregor13c85772010-05-06 00:28:52 +00006994 = ClassTemplateSpecializationDecl::Create(Context, Kind,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006995 ClassTemplate->getDeclContext(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00006996 KWLoc, TemplateNameLoc,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006997 ClassTemplate,
Douglas Gregor910f8002010-11-07 23:05:16 +00006998 Converted.data(),
6999 Converted.size(),
7000 PrevDecl);
John McCallb6217662010-03-15 10:12:16 +00007001 SetNestedNameSpecifier(Specialization, SS);
Douglas Gregor93dfdb12009-05-13 00:25:59 +00007002
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00007003 if (!HasNoEffect && !PrevDecl) {
Abramo Bagnarac98971d2010-06-12 07:44:57 +00007004 // Insert the new specialization.
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00007005 ClassTemplate->AddSpecialization(Specialization, InsertPos);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00007006 }
Douglas Gregor93dfdb12009-05-13 00:25:59 +00007007 }
7008
7009 // Build the fully-sugared type for this explicit instantiation as
7010 // the user wrote in the explicit instantiation itself. This means
7011 // that we'll pretty-print the type retrieved from the
7012 // specialization's declaration the way that the user actually wrote
7013 // the explicit instantiation, rather than formatting the name based
7014 // on the "canonical" representation used to store the template
7015 // arguments in the specialization.
John McCall3cb0ebd2010-03-10 03:28:59 +00007016 TypeSourceInfo *WrittenTy
7017 = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc,
7018 TemplateArgs,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00007019 Context.getTypeDeclType(Specialization));
7020 Specialization->setTypeAsWritten(WrittenTy);
Douglas Gregor93dfdb12009-05-13 00:25:59 +00007021
Abramo Bagnarac98971d2010-06-12 07:44:57 +00007022 // Set source locations for keywords.
7023 Specialization->setExternLoc(ExternLoc);
7024 Specialization->setTemplateKeywordLoc(TemplateLoc);
Argyrios Kyrtzidis2fb5d122013-04-22 23:23:42 +00007025 Specialization->setRBraceLoc(SourceLocation());
Abramo Bagnarac98971d2010-06-12 07:44:57 +00007026
Rafael Espindola0257b7f2012-01-03 06:04:21 +00007027 if (Attr)
7028 ProcessDeclAttributeList(S, Specialization, Attr);
7029
Abramo Bagnarac98971d2010-06-12 07:44:57 +00007030 // Add the explicit instantiation into its lexical context. However,
7031 // since explicit instantiations are never found by name lookup, we
7032 // just put it into the declaration context directly.
7033 Specialization->setLexicalDeclContext(CurContext);
7034 CurContext->addDecl(Specialization);
7035
7036 // Syntax is now OK, so return if it has no other effect on semantics.
7037 if (HasNoEffect) {
7038 // Set the template specialization kind.
7039 Specialization->setTemplateSpecializationKind(TSK);
John McCalld226f652010-08-21 09:40:31 +00007040 return Specialization;
Douglas Gregord78f5982009-11-25 06:01:46 +00007041 }
Douglas Gregor93dfdb12009-05-13 00:25:59 +00007042
7043 // C++ [temp.explicit]p3:
Douglas Gregor93dfdb12009-05-13 00:25:59 +00007044 // A definition of a class template or class member template
7045 // shall be in scope at the point of the explicit instantiation of
7046 // the class template or class member template.
7047 //
7048 // This check comes when we actually try to perform the
7049 // instantiation.
Douglas Gregor89a5bea2009-10-15 22:53:21 +00007050 ClassTemplateSpecializationDecl *Def
7051 = cast_or_null<ClassTemplateSpecializationDecl>(
Douglas Gregor952b0172010-02-11 01:04:33 +00007052 Specialization->getDefinition());
Douglas Gregor89a5bea2009-10-15 22:53:21 +00007053 if (!Def)
Douglas Gregor972e6ce2009-10-27 06:26:26 +00007054 InstantiateClassTemplateSpecialization(TemplateNameLoc, Specialization, TSK);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00007055 else if (TSK == TSK_ExplicitInstantiationDefinition) {
Douglas Gregor6fb745b2010-05-13 16:44:06 +00007056 MarkVTableUsed(TemplateNameLoc, Specialization, true);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00007057 Specialization->setPointOfInstantiation(Def->getPointOfInstantiation());
7058 }
Douglas Gregor6fb745b2010-05-13 16:44:06 +00007059
Douglas Gregor0d035142009-10-27 18:42:08 +00007060 // Instantiate the members of this class template specialization.
7061 Def = cast_or_null<ClassTemplateSpecializationDecl>(
Douglas Gregor952b0172010-02-11 01:04:33 +00007062 Specialization->getDefinition());
Rafael Espindolab0f65ca2010-03-22 23:12:48 +00007063 if (Def) {
Rafael Espindolaf075b222010-03-23 19:55:22 +00007064 TemplateSpecializationKind Old_TSK = Def->getTemplateSpecializationKind();
7065
7066 // Fix a TSK_ExplicitInstantiationDeclaration followed by a
7067 // TSK_ExplicitInstantiationDefinition
7068 if (Old_TSK == TSK_ExplicitInstantiationDeclaration &&
7069 TSK == TSK_ExplicitInstantiationDefinition)
7070 Def->setTemplateSpecializationKind(TSK);
Rafael Espindolab0f65ca2010-03-22 23:12:48 +00007071
Douglas Gregor89a5bea2009-10-15 22:53:21 +00007072 InstantiateClassTemplateSpecializationMembers(TemplateNameLoc, Def, TSK);
Rafael Espindolab0f65ca2010-03-22 23:12:48 +00007073 }
Douglas Gregor93dfdb12009-05-13 00:25:59 +00007074
Abramo Bagnarac98971d2010-06-12 07:44:57 +00007075 // Set the template specialization kind.
7076 Specialization->setTemplateSpecializationKind(TSK);
John McCalld226f652010-08-21 09:40:31 +00007077 return Specialization;
Douglas Gregor93dfdb12009-05-13 00:25:59 +00007078}
7079
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00007080// Explicit instantiation of a member class of a class template.
John McCalld226f652010-08-21 09:40:31 +00007081DeclResult
Mike Stump1eb44332009-09-09 15:08:12 +00007082Sema::ActOnExplicitInstantiation(Scope *S,
Douglas Gregor45f96552009-09-04 06:33:52 +00007083 SourceLocation ExternLoc,
7084 SourceLocation TemplateLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00007085 unsigned TagSpec,
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00007086 SourceLocation KWLoc,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00007087 CXXScopeSpec &SS,
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00007088 IdentifierInfo *Name,
7089 SourceLocation NameLoc,
7090 AttributeList *Attr) {
7091
Douglas Gregor402abb52009-05-28 23:31:59 +00007092 bool Owned = false;
John McCallc4e70192009-09-11 04:59:25 +00007093 bool IsDependent = false;
John McCallf312b1e2010-08-26 23:41:50 +00007094 Decl *TagD = ActOnTag(S, TagSpec, Sema::TUK_Reference,
John McCalld226f652010-08-21 09:40:31 +00007095 KWLoc, SS, Name, NameLoc, Attr, AS_none,
Douglas Gregore7612302011-09-09 19:05:14 +00007096 /*ModulePrivateLoc=*/SourceLocation(),
Benjamin Kramer5354e772012-08-23 23:38:35 +00007097 MultiTemplateParamsArg(), Owned, IsDependent,
7098 SourceLocation(), false, TypeResult());
John McCallc4e70192009-09-11 04:59:25 +00007099 assert(!IsDependent && "explicit instantiation of dependent name not yet handled");
7100
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00007101 if (!TagD)
7102 return true;
7103
John McCalld226f652010-08-21 09:40:31 +00007104 TagDecl *Tag = cast<TagDecl>(TagD);
Richard Smith1af83c42012-03-23 03:33:32 +00007105 assert(!Tag->isEnum() && "shouldn't see enumerations here");
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00007106
Douglas Gregord0c87372009-05-27 17:30:49 +00007107 if (Tag->isInvalidDecl())
7108 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007109
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00007110 CXXRecordDecl *Record = cast<CXXRecordDecl>(Tag);
7111 CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass();
7112 if (!Pattern) {
7113 Diag(TemplateLoc, diag::err_explicit_instantiation_nontemplate_type)
7114 << Context.getTypeDeclType(Record);
7115 Diag(Record->getLocation(), diag::note_nontemplate_decl_here);
7116 return true;
7117 }
7118
Douglas Gregor558c0322009-10-14 23:41:34 +00007119 // C++0x [temp.explicit]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007120 // If the explicit instantiation is for a class or member class, the
7121 // elaborated-type-specifier in the declaration shall include a
Douglas Gregor558c0322009-10-14 23:41:34 +00007122 // simple-template-id.
7123 //
7124 // C++98 has the same restriction, just worded differently.
7125 if (!ScopeSpecifierHasTemplateId(SS))
Douglas Gregora2dd8282010-06-16 16:26:47 +00007126 Diag(TemplateLoc, diag::ext_explicit_instantiation_without_qualified_id)
Douglas Gregor558c0322009-10-14 23:41:34 +00007127 << Record << SS.getRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007128
Douglas Gregor558c0322009-10-14 23:41:34 +00007129 // C++0x [temp.explicit]p2:
7130 // There are two forms of explicit instantiation: an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007131 // definition and an explicit instantiation declaration. An explicit
Douglas Gregor558c0322009-10-14 23:41:34 +00007132 // instantiation declaration begins with the extern keyword. [...]
Douglas Gregora74bbe22009-10-14 21:46:58 +00007133 TemplateSpecializationKind TSK
7134 = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition
7135 : TSK_ExplicitInstantiationDeclaration;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007136
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00007137 // C++0x [temp.explicit]p2:
7138 // [...] An explicit instantiation shall appear in an enclosing
7139 // namespace of its template. [...]
7140 //
7141 // This is C++ DR 275.
Douglas Gregor558c0322009-10-14 23:41:34 +00007142 CheckExplicitInstantiationScope(*this, Record, NameLoc, true);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007143
Douglas Gregor454885e2009-10-15 15:54:05 +00007144 // Verify that it is okay to explicitly instantiate here.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007145 CXXRecordDecl *PrevDecl
Douglas Gregoref96ee02012-01-14 16:38:05 +00007146 = cast_or_null<CXXRecordDecl>(Record->getPreviousDecl());
Douglas Gregor952b0172010-02-11 01:04:33 +00007147 if (!PrevDecl && Record->getDefinition())
Douglas Gregor583f33b2009-10-15 18:07:02 +00007148 PrevDecl = Record;
7149 if (PrevDecl) {
Douglas Gregor454885e2009-10-15 15:54:05 +00007150 MemberSpecializationInfo *MSInfo = PrevDecl->getMemberSpecializationInfo();
Abramo Bagnarac98971d2010-06-12 07:44:57 +00007151 bool HasNoEffect = false;
Douglas Gregor454885e2009-10-15 15:54:05 +00007152 assert(MSInfo && "No member specialization information?");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007153 if (CheckSpecializationInstantiationRedecl(TemplateLoc, TSK,
Douglas Gregor454885e2009-10-15 15:54:05 +00007154 PrevDecl,
7155 MSInfo->getTemplateSpecializationKind(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007156 MSInfo->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00007157 HasNoEffect))
Douglas Gregor454885e2009-10-15 15:54:05 +00007158 return true;
Abramo Bagnarac98971d2010-06-12 07:44:57 +00007159 if (HasNoEffect)
Douglas Gregor454885e2009-10-15 15:54:05 +00007160 return TagD;
7161 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007162
Douglas Gregor89a5bea2009-10-15 22:53:21 +00007163 CXXRecordDecl *RecordDef
Douglas Gregor952b0172010-02-11 01:04:33 +00007164 = cast_or_null<CXXRecordDecl>(Record->getDefinition());
Douglas Gregor89a5bea2009-10-15 22:53:21 +00007165 if (!RecordDef) {
Douglas Gregorbf7643e2009-10-15 12:53:22 +00007166 // C++ [temp.explicit]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007167 // A definition of a member class of a class template shall be in scope
Douglas Gregorbf7643e2009-10-15 12:53:22 +00007168 // at the point of an explicit instantiation of the member class.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007169 CXXRecordDecl *Def
Douglas Gregor952b0172010-02-11 01:04:33 +00007170 = cast_or_null<CXXRecordDecl>(Pattern->getDefinition());
Douglas Gregorbf7643e2009-10-15 12:53:22 +00007171 if (!Def) {
Douglas Gregore2d3a3d2009-10-15 14:05:49 +00007172 Diag(TemplateLoc, diag::err_explicit_instantiation_undefined_member)
7173 << 0 << Record->getDeclName() << Record->getDeclContext();
Douglas Gregorbf7643e2009-10-15 12:53:22 +00007174 Diag(Pattern->getLocation(), diag::note_forward_declaration)
7175 << Pattern;
7176 return true;
Douglas Gregor0d035142009-10-27 18:42:08 +00007177 } else {
7178 if (InstantiateClass(NameLoc, Record, Def,
7179 getTemplateInstantiationArgs(Record),
7180 TSK))
7181 return true;
7182
Douglas Gregor952b0172010-02-11 01:04:33 +00007183 RecordDef = cast_or_null<CXXRecordDecl>(Record->getDefinition());
Douglas Gregor0d035142009-10-27 18:42:08 +00007184 if (!RecordDef)
7185 return true;
7186 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007187 }
7188
Douglas Gregor0d035142009-10-27 18:42:08 +00007189 // Instantiate all of the members of the class.
7190 InstantiateClassMembers(NameLoc, RecordDef,
7191 getTemplateInstantiationArgs(Record), TSK);
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00007192
Douglas Gregor6fb745b2010-05-13 16:44:06 +00007193 if (TSK == TSK_ExplicitInstantiationDefinition)
7194 MarkVTableUsed(NameLoc, RecordDef, true);
7195
Mike Stump390b4cc2009-05-16 07:39:55 +00007196 // FIXME: We don't have any representation for explicit instantiations of
7197 // member classes. Such a representation is not needed for compilation, but it
7198 // should be available for clients that want to see all of the declarations in
7199 // the source code.
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00007200 return TagD;
7201}
7202
John McCallf312b1e2010-08-26 23:41:50 +00007203DeclResult Sema::ActOnExplicitInstantiation(Scope *S,
7204 SourceLocation ExternLoc,
7205 SourceLocation TemplateLoc,
7206 Declarator &D) {
Douglas Gregord5a423b2009-09-25 18:43:00 +00007207 // Explicit instantiations always require a name.
Abramo Bagnara25777432010-08-11 22:01:17 +00007208 // TODO: check if/when DNInfo should replace Name.
7209 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
7210 DeclarationName Name = NameInfo.getName();
Douglas Gregord5a423b2009-09-25 18:43:00 +00007211 if (!Name) {
7212 if (!D.isInvalidType())
Daniel Dunbar96a00142012-03-09 18:35:03 +00007213 Diag(D.getDeclSpec().getLocStart(),
Douglas Gregord5a423b2009-09-25 18:43:00 +00007214 diag::err_explicit_instantiation_requires_name)
7215 << D.getDeclSpec().getSourceRange()
7216 << D.getSourceRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007217
Douglas Gregord5a423b2009-09-25 18:43:00 +00007218 return true;
7219 }
7220
7221 // The scope passed in may not be a decl scope. Zip up the scope tree until
7222 // we find one that is.
7223 while ((S->getFlags() & Scope::DeclScope) == 0 ||
7224 (S->getFlags() & Scope::TemplateParamScope) != 0)
7225 S = S->getParent();
7226
7227 // Determine the type of the declaration.
John McCallbf1a0282010-06-04 23:28:52 +00007228 TypeSourceInfo *T = GetTypeForDeclarator(D, S);
7229 QualType R = T->getType();
Douglas Gregord5a423b2009-09-25 18:43:00 +00007230 if (R.isNull())
7231 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007232
Douglas Gregore885e182011-05-21 18:53:30 +00007233 // C++ [dcl.stc]p1:
7234 // A storage-class-specifier shall not be specified in [...] an explicit
7235 // instantiation (14.7.2) directive.
Douglas Gregord5a423b2009-09-25 18:43:00 +00007236 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
Douglas Gregord5a423b2009-09-25 18:43:00 +00007237 Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_of_typedef)
7238 << Name;
7239 return true;
Douglas Gregore885e182011-05-21 18:53:30 +00007240 } else if (D.getDeclSpec().getStorageClassSpec()
7241 != DeclSpec::SCS_unspecified) {
7242 // Complain about then remove the storage class specifier.
7243 Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_storage_class)
7244 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
7245
7246 D.getMutableDeclSpec().ClearStorageClassSpecs();
Douglas Gregord5a423b2009-09-25 18:43:00 +00007247 }
7248
Douglas Gregor663b5a02009-10-14 20:14:33 +00007249 // C++0x [temp.explicit]p1:
7250 // [...] An explicit instantiation of a function template shall not use the
7251 // inline or constexpr specifiers.
7252 // Presumably, this also applies to member functions of class templates as
7253 // well.
Richard Smith2dc7ece2011-10-18 03:44:03 +00007254 if (D.getDeclSpec().isInlineSpecified())
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007255 Diag(D.getDeclSpec().getInlineSpecLoc(),
Richard Smith80ad52f2013-01-02 11:42:31 +00007256 getLangOpts().CPlusPlus11 ?
Richard Smith2dc7ece2011-10-18 03:44:03 +00007257 diag::err_explicit_instantiation_inline :
7258 diag::warn_explicit_instantiation_inline_0x)
Richard Smithfe6f6482011-10-14 19:58:02 +00007259 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
Larisse Voufoef4579c2013-08-06 01:03:05 +00007260 if (D.getDeclSpec().isConstexprSpecified() && R->isFunctionType())
Richard Smithfe6f6482011-10-14 19:58:02 +00007261 // FIXME: Add a fix-it to remove the 'constexpr' and add a 'const' if one is
7262 // not already specified.
7263 Diag(D.getDeclSpec().getConstexprSpecLoc(),
7264 diag::err_explicit_instantiation_constexpr);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007265
Douglas Gregor558c0322009-10-14 23:41:34 +00007266 // C++0x [temp.explicit]p2:
7267 // There are two forms of explicit instantiation: an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007268 // definition and an explicit instantiation declaration. An explicit
7269 // instantiation declaration begins with the extern keyword. [...]
Douglas Gregord5a423b2009-09-25 18:43:00 +00007270 TemplateSpecializationKind TSK
7271 = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition
7272 : TSK_ExplicitInstantiationDeclaration;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007273
Abramo Bagnara25777432010-08-11 22:01:17 +00007274 LookupResult Previous(*this, NameInfo, LookupOrdinaryName);
John McCalla24dc2e2009-11-17 02:14:36 +00007275 LookupParsedName(Previous, S, &D.getCXXScopeSpec());
Douglas Gregord5a423b2009-09-25 18:43:00 +00007276
7277 if (!R->isFunctionType()) {
7278 // C++ [temp.explicit]p1:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007279 // A [...] static data member of a class template can be explicitly
7280 // instantiated from the member definition associated with its class
Douglas Gregord5a423b2009-09-25 18:43:00 +00007281 // template.
Larisse Voufoef4579c2013-08-06 01:03:05 +00007282 // C++1y [temp.explicit]p1:
7283 // A [...] variable [...] template specialization can be explicitly
7284 // instantiated from its template.
John McCalla24dc2e2009-11-17 02:14:36 +00007285 if (Previous.isAmbiguous())
7286 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007287
John McCall1bcee0a2009-12-02 08:25:40 +00007288 VarDecl *Prev = Previous.getAsSingle<VarDecl>();
Larisse Voufoef4579c2013-08-06 01:03:05 +00007289 VarTemplateDecl *PrevTemplate = Previous.getAsSingle<VarTemplateDecl>();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007290
Larisse Voufoef4579c2013-08-06 01:03:05 +00007291 if (!PrevTemplate) {
7292 if (!Prev || !Prev->isStaticDataMember()) {
7293 // We expect to see a data data member here.
7294 Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_not_known)
7295 << Name;
7296 for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end();
7297 P != PEnd; ++P)
7298 Diag((*P)->getLocation(), diag::note_explicit_instantiation_here);
7299 return true;
7300 }
7301
7302 if (!Prev->getInstantiatedFromStaticDataMember()) {
7303 // FIXME: Check for explicit specialization?
7304 Diag(D.getIdentifierLoc(),
7305 diag::err_explicit_instantiation_data_member_not_instantiated)
7306 << Prev;
7307 Diag(Prev->getLocation(), diag::note_explicit_instantiation_here);
7308 // FIXME: Can we provide a note showing where this was declared?
7309 return true;
7310 }
7311 } else {
7312 // Explicitly instantiate a variable template.
7313
7314 // C++1y [dcl.spec.auto]p6:
7315 // ... A program that uses auto or decltype(auto) in a context not
7316 // explicitly allowed in this section is ill-formed.
7317 //
7318 // This includes auto-typed variable template instantiations.
7319 if (R->isUndeducedType()) {
7320 Diag(T->getTypeLoc().getLocStart(),
7321 diag::err_auto_not_allowed_var_inst);
7322 return true;
7323 }
7324
Richard Smith8e6557e2013-09-18 02:10:12 +00007325 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) {
7326 // C++1y [temp.explicit]p3:
7327 // If the explicit instantiation is for a variable, the unqualified-id
7328 // in the declaration shall be a template-id.
7329 Diag(D.getIdentifierLoc(),
7330 diag::err_explicit_instantiation_without_template_id)
7331 << PrevTemplate;
7332 Diag(PrevTemplate->getLocation(),
7333 diag::note_explicit_instantiation_here);
7334 return true;
Larisse Voufoef4579c2013-08-06 01:03:05 +00007335 }
7336
Richard Smith8e6557e2013-09-18 02:10:12 +00007337 // Translate the parser's template argument list into our AST format.
7338 TemplateArgumentListInfo TemplateArgs;
7339 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
7340 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
7341 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
7342 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
7343 TemplateId->NumArgs);
7344 translateTemplateArguments(TemplateArgsPtr, TemplateArgs);
7345
Larisse Voufoef4579c2013-08-06 01:03:05 +00007346 DeclResult Res = CheckVarTemplateId(PrevTemplate, TemplateLoc,
7347 D.getIdentifierLoc(), TemplateArgs);
7348 if (Res.isInvalid())
7349 return true;
7350
7351 // Ignore access control bits, we don't need them for redeclaration
7352 // checking.
7353 Prev = cast<VarDecl>(Res.get());
Douglas Gregord5a423b2009-09-25 18:43:00 +00007354 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007355
Douglas Gregor558c0322009-10-14 23:41:34 +00007356 // C++0x [temp.explicit]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007357 // If the explicit instantiation is for a member function, a member class
Douglas Gregor558c0322009-10-14 23:41:34 +00007358 // or a static data member of a class template specialization, the name of
7359 // the class template specialization in the qualified-id for the member
7360 // name shall be a simple-template-id.
7361 //
7362 // C++98 has the same restriction, just worded differently.
Larisse Voufoef4579c2013-08-06 01:03:05 +00007363 //
Richard Smith2a9dfb02013-09-18 21:55:14 +00007364 // This does not apply to variable template specializations, where the
7365 // template-id is in the unqualified-id instead.
7366 if (!ScopeSpecifierHasTemplateId(D.getCXXScopeSpec()) && !PrevTemplate)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007367 Diag(D.getIdentifierLoc(),
Douglas Gregora2dd8282010-06-16 16:26:47 +00007368 diag::ext_explicit_instantiation_without_qualified_id)
Douglas Gregor558c0322009-10-14 23:41:34 +00007369 << Prev << D.getCXXScopeSpec().getRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007370
Douglas Gregor558c0322009-10-14 23:41:34 +00007371 // Check the scope of this explicit instantiation.
7372 CheckExplicitInstantiationScope(*this, Prev, D.getIdentifierLoc(), true);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007373
Douglas Gregor454885e2009-10-15 15:54:05 +00007374 // Verify that it is okay to explicitly instantiate here.
7375 MemberSpecializationInfo *MSInfo = Prev->getMemberSpecializationInfo();
Larisse Voufoef4579c2013-08-06 01:03:05 +00007376 TemplateSpecializationKind PrevTSK =
7377 MSInfo ? MSInfo->getTemplateSpecializationKind()
7378 : Prev->getTemplateSpecializationKind();
7379 SourceLocation POI = MSInfo ? MSInfo->getPointOfInstantiation()
7380 : cast<VarTemplateSpecializationDecl>(Prev)
7381 ->getPointOfInstantiation();
Abramo Bagnarac98971d2010-06-12 07:44:57 +00007382 bool HasNoEffect = false;
Douglas Gregor0d035142009-10-27 18:42:08 +00007383 if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK, Prev,
Larisse Voufoef4579c2013-08-06 01:03:05 +00007384 PrevTSK, POI, HasNoEffect))
Douglas Gregor454885e2009-10-15 15:54:05 +00007385 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007386
Larisse Voufoef4579c2013-08-06 01:03:05 +00007387 if (!HasNoEffect) {
7388 // Instantiate static data member or variable template.
7389
7390 Prev->setTemplateSpecializationKind(TSK, D.getIdentifierLoc());
7391 if (PrevTemplate) {
7392 // Merge attributes.
7393 if (AttributeList *Attr = D.getDeclSpec().getAttributes().getList())
7394 ProcessDeclAttributeList(S, Prev, Attr);
7395 }
7396 if (TSK == TSK_ExplicitInstantiationDefinition)
7397 InstantiateVariableDefinition(D.getIdentifierLoc(), Prev);
7398 }
7399
7400 // Check the new variable specialization against the parsed input.
7401 if (PrevTemplate && Prev && !Context.hasSameType(Prev->getType(), R)) {
7402 Diag(T->getTypeLoc().getLocStart(),
7403 diag::err_invalid_var_template_spec_type)
7404 << 0 << PrevTemplate << R << Prev->getType();
7405 Diag(PrevTemplate->getLocation(), diag::note_template_declared_here)
7406 << 2 << PrevTemplate->getDeclName();
7407 return true;
7408 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007409
Douglas Gregord5a423b2009-09-25 18:43:00 +00007410 // FIXME: Create an ExplicitInstantiation node?
John McCalld226f652010-08-21 09:40:31 +00007411 return (Decl*) 0;
Douglas Gregord5a423b2009-09-25 18:43:00 +00007412 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007413
7414 // If the declarator is a template-id, translate the parser's template
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00007415 // argument list into our AST format.
Douglas Gregordb422df2009-09-25 21:45:23 +00007416 bool HasExplicitTemplateArgs = false;
John McCalld5532b62009-11-23 01:53:49 +00007417 TemplateArgumentListInfo TemplateArgs;
Douglas Gregor3f9a0562009-11-03 01:35:08 +00007418 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
7419 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
John McCalld5532b62009-11-23 01:53:49 +00007420 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
7421 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
Benjamin Kramer5354e772012-08-23 23:38:35 +00007422 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
Douglas Gregordb422df2009-09-25 21:45:23 +00007423 TemplateId->NumArgs);
John McCalld5532b62009-11-23 01:53:49 +00007424 translateTemplateArguments(TemplateArgsPtr, TemplateArgs);
Douglas Gregordb422df2009-09-25 21:45:23 +00007425 HasExplicitTemplateArgs = true;
7426 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007427
Douglas Gregord5a423b2009-09-25 18:43:00 +00007428 // C++ [temp.explicit]p1:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007429 // A [...] function [...] can be explicitly instantiated from its template.
7430 // A member function [...] of a class template can be explicitly
7431 // instantiated from the member definition associated with its class
Douglas Gregord5a423b2009-09-25 18:43:00 +00007432 // template.
John McCallc373d482010-01-27 01:50:18 +00007433 UnresolvedSet<8> Matches;
Larisse Voufo43847122013-07-19 23:00:19 +00007434 TemplateSpecCandidateSet FailedCandidates(D.getIdentifierLoc());
Douglas Gregord5a423b2009-09-25 18:43:00 +00007435 for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end();
7436 P != PEnd; ++P) {
7437 NamedDecl *Prev = *P;
Douglas Gregordb422df2009-09-25 21:45:23 +00007438 if (!HasExplicitTemplateArgs) {
7439 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Prev)) {
7440 if (Context.hasSameUnqualifiedType(Method->getType(), R)) {
7441 Matches.clear();
Douglas Gregor48026d22010-01-11 18:40:55 +00007442
John McCallc373d482010-01-27 01:50:18 +00007443 Matches.addDecl(Method, P.getAccess());
Douglas Gregor48026d22010-01-11 18:40:55 +00007444 if (Method->getTemplateSpecializationKind() == TSK_Undeclared)
7445 break;
Douglas Gregordb422df2009-09-25 21:45:23 +00007446 }
Douglas Gregord5a423b2009-09-25 18:43:00 +00007447 }
7448 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007449
Douglas Gregord5a423b2009-09-25 18:43:00 +00007450 FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Prev);
7451 if (!FunTmpl)
7452 continue;
7453
Larisse Voufo43847122013-07-19 23:00:19 +00007454 TemplateDeductionInfo Info(FailedCandidates.getLocation());
Douglas Gregord5a423b2009-09-25 18:43:00 +00007455 FunctionDecl *Specialization = 0;
7456 if (TemplateDeductionResult TDK
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007457 = DeduceTemplateArguments(FunTmpl,
John McCalld5532b62009-11-23 01:53:49 +00007458 (HasExplicitTemplateArgs ? &TemplateArgs : 0),
Douglas Gregord5a423b2009-09-25 18:43:00 +00007459 R, Specialization, Info)) {
Larisse Voufo43847122013-07-19 23:00:19 +00007460 // Keep track of almost-matches.
7461 FailedCandidates.addCandidate()
7462 .set(FunTmpl->getTemplatedDecl(),
7463 MakeDeductionFailureInfo(Context, TDK, Info));
Douglas Gregord5a423b2009-09-25 18:43:00 +00007464 (void)TDK;
7465 continue;
7466 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007467
John McCallc373d482010-01-27 01:50:18 +00007468 Matches.addDecl(Specialization, P.getAccess());
Douglas Gregord5a423b2009-09-25 18:43:00 +00007469 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007470
Douglas Gregord5a423b2009-09-25 18:43:00 +00007471 // Find the most specialized function template specialization.
Larisse Voufo43847122013-07-19 23:00:19 +00007472 UnresolvedSetIterator Result = getMostSpecialized(
Richard Smith4ad09e62013-09-10 22:59:25 +00007473 Matches.begin(), Matches.end(), FailedCandidates,
Larisse Voufo43847122013-07-19 23:00:19 +00007474 D.getIdentifierLoc(),
7475 PDiag(diag::err_explicit_instantiation_not_known) << Name,
7476 PDiag(diag::err_explicit_instantiation_ambiguous) << Name,
7477 PDiag(diag::note_explicit_instantiation_candidate));
Douglas Gregord5a423b2009-09-25 18:43:00 +00007478
John McCallc373d482010-01-27 01:50:18 +00007479 if (Result == Matches.end())
Douglas Gregord5a423b2009-09-25 18:43:00 +00007480 return true;
John McCallc373d482010-01-27 01:50:18 +00007481
7482 // Ignore access control bits, we don't need them for redeclaration checking.
7483 FunctionDecl *Specialization = cast<FunctionDecl>(*Result);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007484
Douglas Gregor0a897e32009-10-15 17:21:20 +00007485 if (Specialization->getTemplateSpecializationKind() == TSK_Undeclared) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007486 Diag(D.getIdentifierLoc(),
Douglas Gregord5a423b2009-09-25 18:43:00 +00007487 diag::err_explicit_instantiation_member_function_not_instantiated)
7488 << Specialization
7489 << (Specialization->getTemplateSpecializationKind() ==
7490 TSK_ExplicitSpecialization);
7491 Diag(Specialization->getLocation(), diag::note_explicit_instantiation_here);
7492 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007493 }
7494
Douglas Gregoref96ee02012-01-14 16:38:05 +00007495 FunctionDecl *PrevDecl = Specialization->getPreviousDecl();
Douglas Gregor583f33b2009-10-15 18:07:02 +00007496 if (!PrevDecl && Specialization->isThisDeclarationADefinition())
7497 PrevDecl = Specialization;
7498
Douglas Gregor0a897e32009-10-15 17:21:20 +00007499 if (PrevDecl) {
Abramo Bagnarac98971d2010-06-12 07:44:57 +00007500 bool HasNoEffect = false;
Douglas Gregor0d035142009-10-27 18:42:08 +00007501 if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007502 PrevDecl,
7503 PrevDecl->getTemplateSpecializationKind(),
Douglas Gregor0a897e32009-10-15 17:21:20 +00007504 PrevDecl->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00007505 HasNoEffect))
Douglas Gregor0a897e32009-10-15 17:21:20 +00007506 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007507
Douglas Gregor0a897e32009-10-15 17:21:20 +00007508 // FIXME: We may still want to build some representation of this
7509 // explicit specialization.
Abramo Bagnarac98971d2010-06-12 07:44:57 +00007510 if (HasNoEffect)
John McCalld226f652010-08-21 09:40:31 +00007511 return (Decl*) 0;
Douglas Gregor0a897e32009-10-15 17:21:20 +00007512 }
Anders Carlsson26d6e9d2009-11-24 05:34:41 +00007513
7514 Specialization->setTemplateSpecializationKind(TSK, D.getIdentifierLoc());
Rafael Espindola256fc4d2012-01-04 05:40:59 +00007515 AttributeList *Attr = D.getDeclSpec().getAttributes().getList();
7516 if (Attr)
7517 ProcessDeclAttributeList(S, Specialization, Attr);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007518
Douglas Gregor0a897e32009-10-15 17:21:20 +00007519 if (TSK == TSK_ExplicitInstantiationDefinition)
Chandler Carruth58e390e2010-08-25 08:27:02 +00007520 InstantiateFunctionDefinition(D.getIdentifierLoc(), Specialization);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007521
Douglas Gregor558c0322009-10-14 23:41:34 +00007522 // C++0x [temp.explicit]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007523 // If the explicit instantiation is for a member function, a member class
Douglas Gregor558c0322009-10-14 23:41:34 +00007524 // or a static data member of a class template specialization, the name of
7525 // the class template specialization in the qualified-id for the member
7526 // name shall be a simple-template-id.
7527 //
7528 // C++98 has the same restriction, just worded differently.
Douglas Gregor0a897e32009-10-15 17:21:20 +00007529 FunctionTemplateDecl *FunTmpl = Specialization->getPrimaryTemplate();
Douglas Gregor3f9a0562009-11-03 01:35:08 +00007530 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId && !FunTmpl &&
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007531 D.getCXXScopeSpec().isSet() &&
Douglas Gregor558c0322009-10-14 23:41:34 +00007532 !ScopeSpecifierHasTemplateId(D.getCXXScopeSpec()))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007533 Diag(D.getIdentifierLoc(),
Douglas Gregora2dd8282010-06-16 16:26:47 +00007534 diag::ext_explicit_instantiation_without_qualified_id)
Douglas Gregor558c0322009-10-14 23:41:34 +00007535 << Specialization << D.getCXXScopeSpec().getRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007536
Douglas Gregor558c0322009-10-14 23:41:34 +00007537 CheckExplicitInstantiationScope(*this,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007538 FunTmpl? (NamedDecl *)FunTmpl
Douglas Gregor558c0322009-10-14 23:41:34 +00007539 : Specialization->getInstantiatedFromMemberFunction(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007540 D.getIdentifierLoc(),
Douglas Gregor558c0322009-10-14 23:41:34 +00007541 D.getCXXScopeSpec().isSet());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007542
Douglas Gregord5a423b2009-09-25 18:43:00 +00007543 // FIXME: Create some kind of ExplicitInstantiationDecl here.
John McCalld226f652010-08-21 09:40:31 +00007544 return (Decl*) 0;
Douglas Gregord5a423b2009-09-25 18:43:00 +00007545}
7546
John McCallf312b1e2010-08-26 23:41:50 +00007547TypeResult
John McCallc4e70192009-09-11 04:59:25 +00007548Sema::ActOnDependentTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
7549 const CXXScopeSpec &SS, IdentifierInfo *Name,
7550 SourceLocation TagLoc, SourceLocation NameLoc) {
7551 // This has to hold, because SS is expected to be defined.
7552 assert(Name && "Expected a name in a dependent tag");
7553
7554 NestedNameSpecifier *NNS
7555 = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
7556 if (!NNS)
7557 return true;
7558
Abramo Bagnara465d41b2010-05-11 21:36:43 +00007559 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
Daniel Dunbar12c0ade2010-04-01 16:50:48 +00007560
Douglas Gregor48c89f42010-04-24 16:38:41 +00007561 if (TUK == TUK_Declaration || TUK == TUK_Definition) {
7562 Diag(NameLoc, diag::err_dependent_tag_decl)
Abramo Bagnara465d41b2010-05-11 21:36:43 +00007563 << (TUK == TUK_Definition) << Kind << SS.getRange();
Douglas Gregor48c89f42010-04-24 16:38:41 +00007564 return true;
7565 }
Abramo Bagnara465d41b2010-05-11 21:36:43 +00007566
Douglas Gregor059101f2011-03-02 00:47:37 +00007567 // Create the resulting type.
Abramo Bagnara465d41b2010-05-11 21:36:43 +00007568 ElaboratedTypeKeyword Kwd = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
Douglas Gregor059101f2011-03-02 00:47:37 +00007569 QualType Result = Context.getDependentNameType(Kwd, NNS, Name);
7570
7571 // Create type-source location information for this type.
7572 TypeLocBuilder TLB;
7573 DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(Result);
Abramo Bagnara38a42912012-02-06 19:09:27 +00007574 TL.setElaboratedKeywordLoc(TagLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00007575 TL.setQualifierLoc(SS.getWithLocInContext(Context));
7576 TL.setNameLoc(NameLoc);
7577 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
John McCallc4e70192009-09-11 04:59:25 +00007578}
7579
John McCallf312b1e2010-08-26 23:41:50 +00007580TypeResult
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007581Sema::ActOnTypenameType(Scope *S, SourceLocation TypenameLoc,
7582 const CXXScopeSpec &SS, const IdentifierInfo &II,
Douglas Gregor1a15dae2010-06-16 22:31:08 +00007583 SourceLocation IdLoc) {
Douglas Gregore29425b2011-02-28 22:42:13 +00007584 if (SS.isInvalid())
Douglas Gregord57959a2009-03-27 23:10:48 +00007585 return true;
Douglas Gregore29425b2011-02-28 22:42:13 +00007586
Richard Smithebaf0e62011-10-18 20:49:44 +00007587 if (TypenameLoc.isValid() && S && !S->getTemplateParamParent())
7588 Diag(TypenameLoc,
Richard Smith80ad52f2013-01-02 11:42:31 +00007589 getLangOpts().CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00007590 diag::warn_cxx98_compat_typename_outside_of_template :
7591 diag::ext_typename_outside_of_template)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007592 << FixItHint::CreateRemoval(TypenameLoc);
7593
Douglas Gregor2494dd02011-03-01 01:34:45 +00007594 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
Douglas Gregor9e876872011-03-01 18:12:44 +00007595 QualType T = CheckTypenameType(TypenameLoc.isValid()? ETK_Typename : ETK_None,
7596 TypenameLoc, QualifierLoc, II, IdLoc);
Douglas Gregor31a19b62009-04-01 21:51:26 +00007597 if (T.isNull())
7598 return true;
John McCall63b43852010-04-29 23:50:39 +00007599
7600 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
7601 if (isa<DependentNameType>(T)) {
David Blaikie39e6ab42013-02-18 22:06:02 +00007602 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>();
Abramo Bagnara38a42912012-02-06 19:09:27 +00007603 TL.setElaboratedKeywordLoc(TypenameLoc);
Douglas Gregor2494dd02011-03-01 01:34:45 +00007604 TL.setQualifierLoc(QualifierLoc);
John McCall4e449832010-05-28 23:32:21 +00007605 TL.setNameLoc(IdLoc);
John McCall63b43852010-04-29 23:50:39 +00007606 } else {
David Blaikie39e6ab42013-02-18 22:06:02 +00007607 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>();
Abramo Bagnara38a42912012-02-06 19:09:27 +00007608 TL.setElaboratedKeywordLoc(TypenameLoc);
Douglas Gregor9e876872011-03-01 18:12:44 +00007609 TL.setQualifierLoc(QualifierLoc);
David Blaikie39e6ab42013-02-18 22:06:02 +00007610 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(IdLoc);
John McCall63b43852010-04-29 23:50:39 +00007611 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007612
John McCallb3d87482010-08-24 05:47:05 +00007613 return CreateParsedType(T, TSI);
Douglas Gregord57959a2009-03-27 23:10:48 +00007614}
7615
John McCallf312b1e2010-08-26 23:41:50 +00007616TypeResult
Abramo Bagnara55d23c92012-02-06 14:41:24 +00007617Sema::ActOnTypenameType(Scope *S,
7618 SourceLocation TypenameLoc,
7619 const CXXScopeSpec &SS,
7620 SourceLocation TemplateKWLoc,
Douglas Gregora02411e2011-02-27 22:46:49 +00007621 TemplateTy TemplateIn,
7622 SourceLocation TemplateNameLoc,
7623 SourceLocation LAngleLoc,
7624 ASTTemplateArgsPtr TemplateArgsIn,
7625 SourceLocation RAngleLoc) {
Richard Smithebaf0e62011-10-18 20:49:44 +00007626 if (TypenameLoc.isValid() && S && !S->getTemplateParamParent())
7627 Diag(TypenameLoc,
Richard Smith80ad52f2013-01-02 11:42:31 +00007628 getLangOpts().CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00007629 diag::warn_cxx98_compat_typename_outside_of_template :
7630 diag::ext_typename_outside_of_template)
7631 << FixItHint::CreateRemoval(TypenameLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00007632
7633 // Translate the parser's template argument list in our AST format.
7634 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
7635 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
7636
7637 TemplateName Template = TemplateIn.get();
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007638 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
7639 // Construct a dependent template specialization type.
7640 assert(DTN && "dependent template has non-dependent name?");
7641 assert(DTN->getQualifier()
7642 == static_cast<NestedNameSpecifier*>(SS.getScopeRep()));
7643 QualType T = Context.getDependentTemplateSpecializationType(ETK_Typename,
7644 DTN->getQualifier(),
7645 DTN->getIdentifier(),
7646 TemplateArgs);
Douglas Gregora02411e2011-02-27 22:46:49 +00007647
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007648 // Create source-location information for this type.
John McCall4e449832010-05-28 23:32:21 +00007649 TypeLocBuilder Builder;
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007650 DependentTemplateSpecializationTypeLoc SpecTL
7651 = Builder.push<DependentTemplateSpecializationTypeLoc>(T);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00007652 SpecTL.setElaboratedKeywordLoc(TypenameLoc);
7653 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
Abramo Bagnara66581d42012-02-06 22:45:07 +00007654 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00007655 SpecTL.setTemplateNameLoc(TemplateNameLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00007656 SpecTL.setLAngleLoc(LAngleLoc);
7657 SpecTL.setRAngleLoc(RAngleLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00007658 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
7659 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007660 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
Douglas Gregor6946baf2009-09-02 13:05:45 +00007661 }
Douglas Gregora02411e2011-02-27 22:46:49 +00007662
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007663 QualType T = CheckTemplateIdType(Template, TemplateNameLoc, TemplateArgs);
7664 if (T.isNull())
7665 return true;
Douglas Gregora02411e2011-02-27 22:46:49 +00007666
Abramo Bagnara55d23c92012-02-06 14:41:24 +00007667 // Provide source-location information for the template specialization type.
Douglas Gregora02411e2011-02-27 22:46:49 +00007668 TypeLocBuilder Builder;
Abramo Bagnara55d23c92012-02-06 14:41:24 +00007669 TemplateSpecializationTypeLoc SpecTL
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007670 = Builder.push<TemplateSpecializationTypeLoc>(T);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00007671 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
7672 SpecTL.setTemplateNameLoc(TemplateNameLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00007673 SpecTL.setLAngleLoc(LAngleLoc);
7674 SpecTL.setRAngleLoc(RAngleLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00007675 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
7676 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
7677
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007678 T = Context.getElaboratedType(ETK_Typename, SS.getScopeRep(), T);
7679 ElaboratedTypeLoc TL = Builder.push<ElaboratedTypeLoc>(T);
Abramo Bagnara38a42912012-02-06 19:09:27 +00007680 TL.setElaboratedKeywordLoc(TypenameLoc);
Douglas Gregor9e876872011-03-01 18:12:44 +00007681 TL.setQualifierLoc(SS.getWithLocInContext(Context));
7682
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007683 TypeSourceInfo *TSI = Builder.getTypeSourceInfo(Context, T);
7684 return CreateParsedType(T, TSI);
Douglas Gregor17343172009-04-01 00:28:59 +00007685}
7686
Douglas Gregora02411e2011-02-27 22:46:49 +00007687
Richard Smith4493c0a2012-05-09 05:17:00 +00007688/// Determine whether this failed name lookup should be treated as being
7689/// disabled by a usage of std::enable_if.
7690static bool isEnableIf(NestedNameSpecifierLoc NNS, const IdentifierInfo &II,
7691 SourceRange &CondRange) {
7692 // We must be looking for a ::type...
7693 if (!II.isStr("type"))
7694 return false;
7695
7696 // ... within an explicitly-written template specialization...
7697 if (!NNS || !NNS.getNestedNameSpecifier()->getAsType())
7698 return false;
7699 TypeLoc EnableIfTy = NNS.getTypeLoc();
David Blaikie39e6ab42013-02-18 22:06:02 +00007700 TemplateSpecializationTypeLoc EnableIfTSTLoc =
7701 EnableIfTy.getAs<TemplateSpecializationTypeLoc>();
7702 if (!EnableIfTSTLoc || EnableIfTSTLoc.getNumArgs() == 0)
Richard Smith4493c0a2012-05-09 05:17:00 +00007703 return false;
7704 const TemplateSpecializationType *EnableIfTST =
David Blaikie39e6ab42013-02-18 22:06:02 +00007705 cast<TemplateSpecializationType>(EnableIfTSTLoc.getTypePtr());
Richard Smith4493c0a2012-05-09 05:17:00 +00007706
7707 // ... which names a complete class template declaration...
7708 const TemplateDecl *EnableIfDecl =
7709 EnableIfTST->getTemplateName().getAsTemplateDecl();
7710 if (!EnableIfDecl || EnableIfTST->isIncompleteType())
7711 return false;
7712
7713 // ... called "enable_if".
7714 const IdentifierInfo *EnableIfII =
7715 EnableIfDecl->getDeclName().getAsIdentifierInfo();
7716 if (!EnableIfII || !EnableIfII->isStr("enable_if"))
7717 return false;
7718
7719 // Assume the first template argument is the condition.
David Blaikie39e6ab42013-02-18 22:06:02 +00007720 CondRange = EnableIfTSTLoc.getArgLoc(0).getSourceRange();
Richard Smith4493c0a2012-05-09 05:17:00 +00007721 return true;
7722}
7723
Douglas Gregord57959a2009-03-27 23:10:48 +00007724/// \brief Build the type that describes a C++ typename specifier,
7725/// e.g., "typename T::type".
7726QualType
Douglas Gregore29425b2011-02-28 22:42:13 +00007727Sema::CheckTypenameType(ElaboratedTypeKeyword Keyword,
7728 SourceLocation KeywordLoc,
7729 NestedNameSpecifierLoc QualifierLoc,
7730 const IdentifierInfo &II,
Abramo Bagnarae4da7a02010-05-19 21:37:53 +00007731 SourceLocation IILoc) {
John McCall77bb1aa2010-05-01 00:40:08 +00007732 CXXScopeSpec SS;
Douglas Gregore29425b2011-02-28 22:42:13 +00007733 SS.Adopt(QualifierLoc);
Douglas Gregord57959a2009-03-27 23:10:48 +00007734
John McCall77bb1aa2010-05-01 00:40:08 +00007735 DeclContext *Ctx = computeDeclContext(SS);
7736 if (!Ctx) {
7737 // If the nested-name-specifier is dependent and couldn't be
7738 // resolved to a type, build a typename type.
Douglas Gregore29425b2011-02-28 22:42:13 +00007739 assert(QualifierLoc.getNestedNameSpecifier()->isDependent());
7740 return Context.getDependentNameType(Keyword,
7741 QualifierLoc.getNestedNameSpecifier(),
7742 &II);
Douglas Gregor42af25f2009-05-11 19:58:34 +00007743 }
Douglas Gregord57959a2009-03-27 23:10:48 +00007744
John McCall77bb1aa2010-05-01 00:40:08 +00007745 // If the nested-name-specifier refers to the current instantiation,
7746 // the "typename" keyword itself is superfluous. In C++03, the
7747 // program is actually ill-formed. However, DR 382 (in C++0x CD1)
7748 // allows such extraneous "typename" keywords, and we retroactively
Douglas Gregor732281d2010-06-14 22:07:54 +00007749 // apply this DR to C++03 code with only a warning. In any case we continue.
Douglas Gregor42af25f2009-05-11 19:58:34 +00007750
John McCall77bb1aa2010-05-01 00:40:08 +00007751 if (RequireCompleteDeclContext(SS, Ctx))
7752 return QualType();
Douglas Gregord57959a2009-03-27 23:10:48 +00007753
7754 DeclarationName Name(&II);
Abramo Bagnarae4da7a02010-05-19 21:37:53 +00007755 LookupResult Result(*this, Name, IILoc, LookupOrdinaryName);
John McCalla24dc2e2009-11-17 02:14:36 +00007756 LookupQualifiedName(Result, Ctx);
Douglas Gregord57959a2009-03-27 23:10:48 +00007757 unsigned DiagID = 0;
7758 Decl *Referenced = 0;
John McCalla24dc2e2009-11-17 02:14:36 +00007759 switch (Result.getResultKind()) {
Richard Smith4493c0a2012-05-09 05:17:00 +00007760 case LookupResult::NotFound: {
7761 // If we're looking up 'type' within a template named 'enable_if', produce
7762 // a more specific diagnostic.
7763 SourceRange CondRange;
7764 if (isEnableIf(QualifierLoc, II, CondRange)) {
7765 Diag(CondRange.getBegin(), diag::err_typename_nested_not_found_enable_if)
7766 << Ctx << CondRange;
7767 return QualType();
7768 }
7769
Douglas Gregor3f093272009-10-13 21:16:44 +00007770 DiagID = diag::err_typename_nested_not_found;
Douglas Gregord57959a2009-03-27 23:10:48 +00007771 break;
Richard Smith4493c0a2012-05-09 05:17:00 +00007772 }
Douglas Gregord9545042010-12-09 00:06:27 +00007773
7774 case LookupResult::FoundUnresolvedValue: {
7775 // We found a using declaration that is a value. Most likely, the using
7776 // declaration itself is meant to have the 'typename' keyword.
Douglas Gregore29425b2011-02-28 22:42:13 +00007777 SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(),
Douglas Gregord9545042010-12-09 00:06:27 +00007778 IILoc);
7779 Diag(IILoc, diag::err_typename_refers_to_using_value_decl)
7780 << Name << Ctx << FullRange;
7781 if (UnresolvedUsingValueDecl *Using
7782 = dyn_cast<UnresolvedUsingValueDecl>(Result.getRepresentativeDecl())){
Douglas Gregordc355712011-02-25 00:36:19 +00007783 SourceLocation Loc = Using->getQualifierLoc().getBeginLoc();
Douglas Gregord9545042010-12-09 00:06:27 +00007784 Diag(Loc, diag::note_using_value_decl_missing_typename)
7785 << FixItHint::CreateInsertion(Loc, "typename ");
7786 }
7787 }
7788 // Fall through to create a dependent typename type, from which we can recover
7789 // better.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007790
Douglas Gregor7d3f5762010-01-15 01:44:47 +00007791 case LookupResult::NotFoundInCurrentInstantiation:
7792 // Okay, it's a member of an unknown instantiation.
Douglas Gregore29425b2011-02-28 22:42:13 +00007793 return Context.getDependentNameType(Keyword,
7794 QualifierLoc.getNestedNameSpecifier(),
7795 &II);
Douglas Gregord57959a2009-03-27 23:10:48 +00007796
7797 case LookupResult::Found:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007798 if (TypeDecl *Type = dyn_cast<TypeDecl>(Result.getFoundDecl())) {
Abramo Bagnara465d41b2010-05-11 21:36:43 +00007799 // We found a type. Build an ElaboratedType, since the
7800 // typename-specifier was just sugar.
Douglas Gregore29425b2011-02-28 22:42:13 +00007801 return Context.getElaboratedType(ETK_Typename,
7802 QualifierLoc.getNestedNameSpecifier(),
Abramo Bagnara465d41b2010-05-11 21:36:43 +00007803 Context.getTypeDeclType(Type));
Douglas Gregord57959a2009-03-27 23:10:48 +00007804 }
7805
7806 DiagID = diag::err_typename_nested_not_type;
John McCallf36e02d2009-10-09 21:13:30 +00007807 Referenced = Result.getFoundDecl();
Douglas Gregord57959a2009-03-27 23:10:48 +00007808 break;
7809
7810 case LookupResult::FoundOverloaded:
7811 DiagID = diag::err_typename_nested_not_type;
7812 Referenced = *Result.begin();
7813 break;
7814
John McCall6e247262009-10-10 05:48:19 +00007815 case LookupResult::Ambiguous:
Douglas Gregord57959a2009-03-27 23:10:48 +00007816 return QualType();
7817 }
7818
7819 // If we get here, it's because name lookup did not find a
7820 // type. Emit an appropriate diagnostic and return an error.
Douglas Gregore29425b2011-02-28 22:42:13 +00007821 SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(),
Abramo Bagnarae4da7a02010-05-19 21:37:53 +00007822 IILoc);
7823 Diag(IILoc, DiagID) << FullRange << Name << Ctx;
Douglas Gregord57959a2009-03-27 23:10:48 +00007824 if (Referenced)
7825 Diag(Referenced->getLocation(), diag::note_typename_refers_here)
7826 << Name;
7827 return QualType();
7828}
Douglas Gregor4a959d82009-08-06 16:20:37 +00007829
7830namespace {
7831 // See Sema::RebuildTypeInCurrentInstantiation
Benjamin Kramer85b45212009-11-28 19:45:26 +00007832 class CurrentInstantiationRebuilder
Mike Stump1eb44332009-09-09 15:08:12 +00007833 : public TreeTransform<CurrentInstantiationRebuilder> {
Douglas Gregor4a959d82009-08-06 16:20:37 +00007834 SourceLocation Loc;
7835 DeclarationName Entity;
Mike Stump1eb44332009-09-09 15:08:12 +00007836
Douglas Gregor4a959d82009-08-06 16:20:37 +00007837 public:
Douglas Gregor895162d2010-04-30 18:55:50 +00007838 typedef TreeTransform<CurrentInstantiationRebuilder> inherited;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007839
Mike Stump1eb44332009-09-09 15:08:12 +00007840 CurrentInstantiationRebuilder(Sema &SemaRef,
Douglas Gregor4a959d82009-08-06 16:20:37 +00007841 SourceLocation Loc,
Mike Stump1eb44332009-09-09 15:08:12 +00007842 DeclarationName Entity)
7843 : TreeTransform<CurrentInstantiationRebuilder>(SemaRef),
Douglas Gregor4a959d82009-08-06 16:20:37 +00007844 Loc(Loc), Entity(Entity) { }
Mike Stump1eb44332009-09-09 15:08:12 +00007845
7846 /// \brief Determine whether the given type \p T has already been
Douglas Gregor4a959d82009-08-06 16:20:37 +00007847 /// transformed.
7848 ///
7849 /// For the purposes of type reconstruction, a type has already been
7850 /// transformed if it is NULL or if it is not dependent.
7851 bool AlreadyTransformed(QualType T) {
7852 return T.isNull() || !T->isDependentType();
7853 }
Mike Stump1eb44332009-09-09 15:08:12 +00007854
7855 /// \brief Returns the location of the entity whose type is being
Douglas Gregor4a959d82009-08-06 16:20:37 +00007856 /// rebuilt.
7857 SourceLocation getBaseLocation() { return Loc; }
Mike Stump1eb44332009-09-09 15:08:12 +00007858
Douglas Gregor4a959d82009-08-06 16:20:37 +00007859 /// \brief Returns the name of the entity whose type is being rebuilt.
7860 DeclarationName getBaseEntity() { return Entity; }
Mike Stump1eb44332009-09-09 15:08:12 +00007861
Douglas Gregor972e6ce2009-10-27 06:26:26 +00007862 /// \brief Sets the "base" location and entity when that
7863 /// information is known based on another transformation.
7864 void setBase(SourceLocation Loc, DeclarationName Entity) {
7865 this->Loc = Loc;
7866 this->Entity = Entity;
7867 }
Douglas Gregordfca6f52012-02-13 22:00:16 +00007868
7869 ExprResult TransformLambdaExpr(LambdaExpr *E) {
7870 // Lambdas never need to be transformed.
7871 return E;
7872 }
Douglas Gregor4a959d82009-08-06 16:20:37 +00007873 };
7874}
7875
Douglas Gregor4a959d82009-08-06 16:20:37 +00007876/// \brief Rebuilds a type within the context of the current instantiation.
7877///
Mike Stump1eb44332009-09-09 15:08:12 +00007878/// The type \p T is part of the type of an out-of-line member definition of
Douglas Gregor4a959d82009-08-06 16:20:37 +00007879/// a class template (or class template partial specialization) that was parsed
Mike Stump1eb44332009-09-09 15:08:12 +00007880/// and constructed before we entered the scope of the class template (or
Douglas Gregor4a959d82009-08-06 16:20:37 +00007881/// partial specialization thereof). This routine will rebuild that type now
7882/// that we have entered the declarator's scope, which may produce different
7883/// canonical types, e.g.,
7884///
7885/// \code
7886/// template<typename T>
7887/// struct X {
7888/// typedef T* pointer;
7889/// pointer data();
7890/// };
7891///
7892/// template<typename T>
7893/// typename X<T>::pointer X<T>::data() { ... }
7894/// \endcode
7895///
Douglas Gregor4714c122010-03-31 17:34:00 +00007896/// Here, the type "typename X<T>::pointer" will be created as a DependentNameType,
Douglas Gregor4a959d82009-08-06 16:20:37 +00007897/// since we do not know that we can look into X<T> when we parsed the type.
7898/// This function will rebuild the type, performing the lookup of "pointer"
Abramo Bagnara465d41b2010-05-11 21:36:43 +00007899/// in X<T> and returning an ElaboratedType whose canonical type is the same
Douglas Gregor4a959d82009-08-06 16:20:37 +00007900/// as the canonical type of T*, allowing the return types of the out-of-line
7901/// definition and the declaration to match.
John McCall63b43852010-04-29 23:50:39 +00007902TypeSourceInfo *Sema::RebuildTypeInCurrentInstantiation(TypeSourceInfo *T,
7903 SourceLocation Loc,
7904 DeclarationName Name) {
7905 if (!T || !T->getType()->isDependentType())
Douglas Gregor4a959d82009-08-06 16:20:37 +00007906 return T;
Mike Stump1eb44332009-09-09 15:08:12 +00007907
Douglas Gregor4a959d82009-08-06 16:20:37 +00007908 CurrentInstantiationRebuilder Rebuilder(*this, Loc, Name);
7909 return Rebuilder.TransformType(T);
Benjamin Kramer27ba2f02009-08-11 22:33:06 +00007910}
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007911
John McCall60d7b3a2010-08-24 06:29:42 +00007912ExprResult Sema::RebuildExprInCurrentInstantiation(Expr *E) {
John McCallb3d87482010-08-24 05:47:05 +00007913 CurrentInstantiationRebuilder Rebuilder(*this, E->getExprLoc(),
7914 DeclarationName());
7915 return Rebuilder.TransformExpr(E);
7916}
7917
John McCall63b43852010-04-29 23:50:39 +00007918bool Sema::RebuildNestedNameSpecifierInCurrentInstantiation(CXXScopeSpec &SS) {
Douglas Gregor7e384942011-02-25 16:07:42 +00007919 if (SS.isInvalid())
7920 return true;
John McCall31f17ec2010-04-27 00:57:59 +00007921
Douglas Gregor7e384942011-02-25 16:07:42 +00007922 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
John McCall31f17ec2010-04-27 00:57:59 +00007923 CurrentInstantiationRebuilder Rebuilder(*this, SS.getRange().getBegin(),
7924 DeclarationName());
Douglas Gregor7e384942011-02-25 16:07:42 +00007925 NestedNameSpecifierLoc Rebuilt
7926 = Rebuilder.TransformNestedNameSpecifierLoc(QualifierLoc);
7927 if (!Rebuilt)
7928 return true;
John McCall63b43852010-04-29 23:50:39 +00007929
Douglas Gregor7e384942011-02-25 16:07:42 +00007930 SS.Adopt(Rebuilt);
John McCall63b43852010-04-29 23:50:39 +00007931 return false;
John McCall31f17ec2010-04-27 00:57:59 +00007932}
7933
Douglas Gregor20606502011-10-14 15:31:12 +00007934/// \brief Rebuild the template parameters now that we know we're in a current
7935/// instantiation.
7936bool Sema::RebuildTemplateParamsInCurrentInstantiation(
7937 TemplateParameterList *Params) {
7938 for (unsigned I = 0, N = Params->size(); I != N; ++I) {
7939 Decl *Param = Params->getParam(I);
7940
7941 // There is nothing to rebuild in a type parameter.
7942 if (isa<TemplateTypeParmDecl>(Param))
7943 continue;
7944
7945 // Rebuild the template parameter list of a template template parameter.
7946 if (TemplateTemplateParmDecl *TTP
7947 = dyn_cast<TemplateTemplateParmDecl>(Param)) {
7948 if (RebuildTemplateParamsInCurrentInstantiation(
7949 TTP->getTemplateParameters()))
7950 return true;
7951
7952 continue;
7953 }
7954
7955 // Rebuild the type of a non-type template parameter.
7956 NonTypeTemplateParmDecl *NTTP = cast<NonTypeTemplateParmDecl>(Param);
7957 TypeSourceInfo *NewTSI
7958 = RebuildTypeInCurrentInstantiation(NTTP->getTypeSourceInfo(),
7959 NTTP->getLocation(),
7960 NTTP->getDeclName());
7961 if (!NewTSI)
7962 return true;
7963
7964 if (NewTSI != NTTP->getTypeSourceInfo()) {
7965 NTTP->setTypeSourceInfo(NewTSI);
7966 NTTP->setType(NewTSI->getType());
7967 }
7968 }
7969
7970 return false;
7971}
7972
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007973/// \brief Produces a formatted string that describes the binding of
7974/// template parameters to template arguments.
7975std::string
7976Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params,
7977 const TemplateArgumentList &Args) {
Douglas Gregor910f8002010-11-07 23:05:16 +00007978 return getTemplateArgumentBindingsText(Params, Args.data(), Args.size());
Douglas Gregor9148c3f2009-11-11 19:13:48 +00007979}
7980
7981std::string
7982Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params,
7983 const TemplateArgument *Args,
7984 unsigned NumArgs) {
Dylan Noblesmithf7ccbad2012-02-05 02:13:05 +00007985 SmallString<128> Str;
Douglas Gregor87dd6972010-12-20 16:52:59 +00007986 llvm::raw_svector_ostream Out(Str);
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007987
Douglas Gregor9148c3f2009-11-11 19:13:48 +00007988 if (!Params || Params->size() == 0 || NumArgs == 0)
Douglas Gregor87dd6972010-12-20 16:52:59 +00007989 return std::string();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007990
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007991 for (unsigned I = 0, N = Params->size(); I != N; ++I) {
Douglas Gregor9148c3f2009-11-11 19:13:48 +00007992 if (I >= NumArgs)
7993 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007994
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007995 if (I == 0)
Douglas Gregor87dd6972010-12-20 16:52:59 +00007996 Out << "[with ";
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007997 else
Douglas Gregor87dd6972010-12-20 16:52:59 +00007998 Out << ", ";
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007999
Douglas Gregorbf4ea562009-09-15 16:23:51 +00008000 if (const IdentifierInfo *Id = Params->getParam(I)->getIdentifier()) {
Douglas Gregor87dd6972010-12-20 16:52:59 +00008001 Out << Id->getName();
Douglas Gregorbf4ea562009-09-15 16:23:51 +00008002 } else {
Douglas Gregor87dd6972010-12-20 16:52:59 +00008003 Out << '$' << I;
Douglas Gregorbf4ea562009-09-15 16:23:51 +00008004 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00008005
Douglas Gregor87dd6972010-12-20 16:52:59 +00008006 Out << " = ";
Douglas Gregor8987b232011-09-27 23:30:47 +00008007 Args[I].print(getPrintingPolicy(), Out);
Douglas Gregorbf4ea562009-09-15 16:23:51 +00008008 }
Douglas Gregor87dd6972010-12-20 16:52:59 +00008009
8010 Out << ']';
8011 return Out.str();
Douglas Gregorbf4ea562009-09-15 16:23:51 +00008012}
Francois Pichet8387e2a2011-04-22 22:18:13 +00008013
Richard Smithac32d902013-08-07 21:41:30 +00008014void Sema::MarkAsLateParsedTemplate(FunctionDecl *FD, Decl *FnD,
8015 CachedTokens &Toks) {
Francois Pichet8387e2a2011-04-22 22:18:13 +00008016 if (!FD)
8017 return;
Richard Smithac32d902013-08-07 21:41:30 +00008018
8019 LateParsedTemplate *LPT = new LateParsedTemplate;
8020
8021 // Take tokens to avoid allocations
8022 LPT->Toks.swap(Toks);
8023 LPT->D = FnD;
8024 LateParsedTemplateMap[FD] = LPT;
8025
8026 FD->setLateTemplateParsed(true);
8027}
8028
8029void Sema::UnmarkAsLateParsedTemplate(FunctionDecl *FD) {
8030 if (!FD)
8031 return;
8032 FD->setLateTemplateParsed(false);
8033}
Francois Pichet8387e2a2011-04-22 22:18:13 +00008034
8035bool Sema::IsInsideALocalClassWithinATemplateFunction() {
8036 DeclContext *DC = CurContext;
8037
8038 while (DC) {
8039 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) {
8040 const FunctionDecl *FD = RD->isLocalClass();
8041 return (FD && FD->getTemplatedKind() != FunctionDecl::TK_NonTemplate);
8042 } else if (DC->isTranslationUnit() || DC->isNamespace())
8043 return false;
8044
8045 DC = DC->getParent();
8046 }
8047 return false;
8048}