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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"
John McCall92b7f702010-03-11 07:50:04 +000014#include "clang/AST/DeclFriend.h"
Douglas Gregoraaba5e32009-02-04 19:02:06 +000015#include "clang/AST/DeclTemplate.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000016#include "clang/AST/Expr.h"
17#include "clang/AST/ExprCXX.h"
John McCall4e2cbb22010-10-20 05:44:58 +000018#include "clang/AST/RecursiveASTVisitor.h"
Douglas Gregor5f3aeb62010-10-13 00:27:52 +000019#include "clang/AST/TypeVisitor.h"
Douglas Gregor72c3f312008-12-05 18:15:24 +000020#include "clang/Basic/LangOptions.h"
Douglas Gregord5a423b2009-09-25 18:43:00 +000021#include "clang/Basic/PartialDiagnostic.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000022#include "clang/Sema/DeclSpec.h"
23#include "clang/Sema/Lookup.h"
24#include "clang/Sema/ParsedTemplate.h"
25#include "clang/Sema/Scope.h"
26#include "clang/Sema/SemaInternal.h"
27#include "clang/Sema/Template.h"
28#include "clang/Sema/TemplateDeduction.h"
Benjamin Kramer013b3662012-01-30 16:17:39 +000029#include "llvm/ADT/SmallBitVector.h"
Benjamin Kramer8fe83e12012-02-04 13:45:25 +000030#include "llvm/ADT/SmallString.h"
Douglas Gregorbf4ea562009-09-15 16:23:51 +000031#include "llvm/ADT/StringExtras.h"
Douglas Gregor72c3f312008-12-05 18:15:24 +000032using namespace clang;
John McCall2a7fb272010-08-25 05:32:35 +000033using namespace sema;
Douglas Gregor72c3f312008-12-05 18:15:24 +000034
John McCall78b81052010-11-10 02:40:36 +000035// Exported for use by Parser.
36SourceRange
37clang::getTemplateParamsRange(TemplateParameterList const * const *Ps,
38 unsigned N) {
39 if (!N) return SourceRange();
40 return SourceRange(Ps[0]->getTemplateLoc(), Ps[N-1]->getRAngleLoc());
41}
42
Douglas Gregor2dd078a2009-09-02 22:59:36 +000043/// \brief Determine whether the declaration found is acceptable as the name
44/// of a template and, if so, return that template declaration. Otherwise,
45/// returns NULL.
John McCallad00b772010-06-16 08:42:20 +000046static NamedDecl *isAcceptableTemplateName(ASTContext &Context,
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +000047 NamedDecl *Orig,
48 bool AllowFunctionTemplates) {
John McCallad00b772010-06-16 08:42:20 +000049 NamedDecl *D = Orig->getUnderlyingDecl();
Mike Stump1eb44332009-09-09 15:08:12 +000050
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +000051 if (isa<TemplateDecl>(D)) {
52 if (!AllowFunctionTemplates && isa<FunctionTemplateDecl>(D))
53 return 0;
54
John McCallad00b772010-06-16 08:42:20 +000055 return Orig;
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +000056 }
Mike Stump1eb44332009-09-09 15:08:12 +000057
Douglas Gregor2dd078a2009-09-02 22:59:36 +000058 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
59 // C++ [temp.local]p1:
60 // Like normal (non-template) classes, class templates have an
61 // injected-class-name (Clause 9). The injected-class-name
62 // can be used with or without a template-argument-list. When
63 // it is used without a template-argument-list, it is
64 // equivalent to the injected-class-name followed by the
65 // template-parameters of the class template enclosed in
66 // <>. When it is used with a template-argument-list, it
67 // refers to the specified class template specialization,
68 // which could be the current specialization or another
69 // specialization.
70 if (Record->isInjectedClassName()) {
Douglas Gregor542b5482009-10-14 17:30:58 +000071 Record = cast<CXXRecordDecl>(Record->getDeclContext());
Douglas Gregor2dd078a2009-09-02 22:59:36 +000072 if (Record->getDescribedClassTemplate())
73 return Record->getDescribedClassTemplate();
74
75 if (ClassTemplateSpecializationDecl *Spec
76 = dyn_cast<ClassTemplateSpecializationDecl>(Record))
77 return Spec->getSpecializedTemplate();
78 }
Mike Stump1eb44332009-09-09 15:08:12 +000079
Douglas Gregor2dd078a2009-09-02 22:59:36 +000080 return 0;
81 }
Mike Stump1eb44332009-09-09 15:08:12 +000082
Douglas Gregor2dd078a2009-09-02 22:59:36 +000083 return 0;
84}
85
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +000086void Sema::FilterAcceptableTemplateNames(LookupResult &R,
87 bool AllowFunctionTemplates) {
Douglas Gregor01e56ae2010-04-12 20:54:26 +000088 // The set of class templates we've already seen.
89 llvm::SmallPtrSet<ClassTemplateDecl *, 8> ClassTemplates;
John McCallf7a1a742009-11-24 19:00:30 +000090 LookupResult::Filter filter = R.makeFilter();
91 while (filter.hasNext()) {
92 NamedDecl *Orig = filter.next();
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +000093 NamedDecl *Repl = isAcceptableTemplateName(Context, Orig,
94 AllowFunctionTemplates);
John McCallf7a1a742009-11-24 19:00:30 +000095 if (!Repl)
96 filter.erase();
Douglas Gregor01e56ae2010-04-12 20:54:26 +000097 else if (Repl != Orig) {
98
99 // C++ [temp.local]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000100 // A lookup that finds an injected-class-name (10.2) can result in an
Douglas Gregor01e56ae2010-04-12 20:54:26 +0000101 // ambiguity in certain cases (for example, if it is found in more than
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000102 // one base class). If all of the injected-class-names that are found
103 // refer to specializations of the same class template, and if the name
Richard Smith3e4c6c42011-05-05 21:57:07 +0000104 // is used as a template-name, the reference refers to the class
105 // template itself and not a specialization thereof, and is not
Douglas Gregor01e56ae2010-04-12 20:54:26 +0000106 // ambiguous.
Douglas Gregor01e56ae2010-04-12 20:54:26 +0000107 if (ClassTemplateDecl *ClassTmpl = dyn_cast<ClassTemplateDecl>(Repl))
108 if (!ClassTemplates.insert(ClassTmpl)) {
109 filter.erase();
110 continue;
111 }
John McCall8ba66912010-08-13 07:02:08 +0000112
113 // FIXME: we promote access to public here as a workaround to
114 // the fact that LookupResult doesn't let us remember that we
115 // found this template through a particular injected class name,
116 // which means we end up doing nasty things to the invariants.
117 // Pretending that access is public is *much* safer.
118 filter.replace(Repl, AS_public);
Douglas Gregor01e56ae2010-04-12 20:54:26 +0000119 }
John McCallf7a1a742009-11-24 19:00:30 +0000120 }
121 filter.done();
122}
123
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000124bool Sema::hasAnyAcceptableTemplateNames(LookupResult &R,
125 bool AllowFunctionTemplates) {
Douglas Gregor312eadb2011-04-24 05:37:28 +0000126 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I)
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000127 if (isAcceptableTemplateName(Context, *I, AllowFunctionTemplates))
Douglas Gregor312eadb2011-04-24 05:37:28 +0000128 return true;
129
Douglas Gregor3b887352011-04-27 04:48:22 +0000130 return false;
Douglas Gregor312eadb2011-04-24 05:37:28 +0000131}
132
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000133TemplateNameKind Sema::isTemplateName(Scope *S,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +0000134 CXXScopeSpec &SS,
Abramo Bagnara7c153532010-08-06 12:11:11 +0000135 bool hasTemplateKeyword,
Douglas Gregor014e88d2009-11-03 23:16:33 +0000136 UnqualifiedId &Name,
John McCallb3d87482010-08-24 05:47:05 +0000137 ParsedType ObjectTypePtr,
Douglas Gregor495c35d2009-08-25 22:51:20 +0000138 bool EnteringContext,
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000139 TemplateTy &TemplateResult,
140 bool &MemberOfUnknownSpecialization) {
David Blaikie4e4d0842012-03-11 07:00:24 +0000141 assert(getLangOpts().CPlusPlus && "No template names in C!");
Douglas Gregorb862b8f2010-01-11 23:29:10 +0000142
Douglas Gregor014e88d2009-11-03 23:16:33 +0000143 DeclarationName TName;
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000144 MemberOfUnknownSpecialization = false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000145
Douglas Gregor014e88d2009-11-03 23:16:33 +0000146 switch (Name.getKind()) {
147 case UnqualifiedId::IK_Identifier:
148 TName = DeclarationName(Name.Identifier);
149 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000150
Douglas Gregor014e88d2009-11-03 23:16:33 +0000151 case UnqualifiedId::IK_OperatorFunctionId:
152 TName = Context.DeclarationNames.getCXXOperatorName(
153 Name.OperatorFunctionId.Operator);
154 break;
155
Sean Hunte6252d12009-11-28 08:58:14 +0000156 case UnqualifiedId::IK_LiteralOperatorId:
Sean Hunt3e518bd2009-11-29 07:34:05 +0000157 TName = Context.DeclarationNames.getCXXLiteralOperatorName(Name.Identifier);
158 break;
Sean Hunte6252d12009-11-28 08:58:14 +0000159
Douglas Gregor014e88d2009-11-03 23:16:33 +0000160 default:
161 return TNK_Non_template;
162 }
Mike Stump1eb44332009-09-09 15:08:12 +0000163
John McCallb3d87482010-08-24 05:47:05 +0000164 QualType ObjectType = ObjectTypePtr.get();
Mike Stump1eb44332009-09-09 15:08:12 +0000165
Daniel Dunbar96a00142012-03-09 18:35:03 +0000166 LookupResult R(*this, TName, Name.getLocStart(), LookupOrdinaryName);
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000167 LookupTemplateName(R, S, SS, ObjectType, EnteringContext,
168 MemberOfUnknownSpecialization);
John McCall67d22fb2010-08-28 20:17:00 +0000169 if (R.empty()) return TNK_Non_template;
170 if (R.isAmbiguous()) {
171 // Suppress diagnostics; we'll redo this lookup later.
John McCallb8592062010-08-13 02:23:42 +0000172 R.suppressDiagnostics();
John McCall67d22fb2010-08-28 20:17:00 +0000173
174 // FIXME: we might have ambiguous templates, in which case we
175 // should at least parse them properly!
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000176 return TNK_Non_template;
John McCallb8592062010-08-13 02:23:42 +0000177 }
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000178
John McCall0bd6feb2009-12-02 08:04:21 +0000179 TemplateName Template;
180 TemplateNameKind TemplateKind;
Mike Stump1eb44332009-09-09 15:08:12 +0000181
John McCall0bd6feb2009-12-02 08:04:21 +0000182 unsigned ResultCount = R.end() - R.begin();
183 if (ResultCount > 1) {
184 // We assume that we'll preserve the qualifier from a function
185 // template name in other ways.
186 Template = Context.getOverloadedTemplateName(R.begin(), R.end());
187 TemplateKind = TNK_Function_template;
John McCallb8592062010-08-13 02:23:42 +0000188
189 // We'll do this lookup again later.
190 R.suppressDiagnostics();
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000191 } else {
John McCall0bd6feb2009-12-02 08:04:21 +0000192 TemplateDecl *TD = cast<TemplateDecl>((*R.begin())->getUnderlyingDecl());
193
194 if (SS.isSet() && !SS.isInvalid()) {
195 NestedNameSpecifier *Qualifier
196 = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
Abramo Bagnara7c153532010-08-06 12:11:11 +0000197 Template = Context.getQualifiedTemplateName(Qualifier,
198 hasTemplateKeyword, TD);
John McCall0bd6feb2009-12-02 08:04:21 +0000199 } else {
200 Template = TemplateName(TD);
201 }
202
John McCallb8592062010-08-13 02:23:42 +0000203 if (isa<FunctionTemplateDecl>(TD)) {
John McCall0bd6feb2009-12-02 08:04:21 +0000204 TemplateKind = TNK_Function_template;
John McCallb8592062010-08-13 02:23:42 +0000205
206 // We'll do this lookup again later.
207 R.suppressDiagnostics();
208 } else {
Richard Smith3e4c6c42011-05-05 21:57:07 +0000209 assert(isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) ||
210 isa<TypeAliasTemplateDecl>(TD));
John McCall0bd6feb2009-12-02 08:04:21 +0000211 TemplateKind = TNK_Type_template;
212 }
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000213 }
Mike Stump1eb44332009-09-09 15:08:12 +0000214
John McCall0bd6feb2009-12-02 08:04:21 +0000215 TemplateResult = TemplateTy::make(Template);
216 return TemplateKind;
John McCallf7a1a742009-11-24 19:00:30 +0000217}
218
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000219bool Sema::DiagnoseUnknownTemplateName(const IdentifierInfo &II,
Douglas Gregor84d0a192010-01-12 21:28:44 +0000220 SourceLocation IILoc,
221 Scope *S,
222 const CXXScopeSpec *SS,
223 TemplateTy &SuggestedTemplate,
224 TemplateNameKind &SuggestedKind) {
225 // We can't recover unless there's a dependent scope specifier preceding the
226 // template name.
Douglas Gregord5ab9b02010-05-21 23:43:39 +0000227 // FIXME: Typo correction?
Douglas Gregor84d0a192010-01-12 21:28:44 +0000228 if (!SS || !SS->isSet() || !isDependentScopeSpecifier(*SS) ||
229 computeDeclContext(*SS))
230 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000231
Douglas Gregor84d0a192010-01-12 21:28:44 +0000232 // The code is missing a 'template' keyword prior to the dependent template
233 // name.
234 NestedNameSpecifier *Qualifier = (NestedNameSpecifier*)SS->getScopeRep();
235 Diag(IILoc, diag::err_template_kw_missing)
236 << Qualifier << II.getName()
Douglas Gregor849b2432010-03-31 17:46:05 +0000237 << FixItHint::CreateInsertion(IILoc, "template ");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000238 SuggestedTemplate
Douglas Gregor84d0a192010-01-12 21:28:44 +0000239 = TemplateTy::make(Context.getDependentTemplateName(Qualifier, &II));
240 SuggestedKind = TNK_Dependent_template_name;
241 return true;
242}
243
John McCallf7a1a742009-11-24 19:00:30 +0000244void Sema::LookupTemplateName(LookupResult &Found,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +0000245 Scope *S, CXXScopeSpec &SS,
John McCallf7a1a742009-11-24 19:00:30 +0000246 QualType ObjectType,
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000247 bool EnteringContext,
248 bool &MemberOfUnknownSpecialization) {
John McCallf7a1a742009-11-24 19:00:30 +0000249 // Determine where to perform name lookup
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000250 MemberOfUnknownSpecialization = false;
John McCallf7a1a742009-11-24 19:00:30 +0000251 DeclContext *LookupCtx = 0;
252 bool isDependent = false;
253 if (!ObjectType.isNull()) {
254 // This nested-name-specifier occurs in a member access expression, e.g.,
255 // x->B::f, and we are looking into the type of the object.
256 assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist");
257 LookupCtx = computeDeclContext(ObjectType);
258 isDependent = ObjectType->isDependentType();
Richard Smith33f0faa2013-06-07 20:03:01 +0000259 assert((isDependent || !ObjectType->isIncompleteType() ||
260 ObjectType->castAs<TagType>()->isBeingDefined()) &&
John McCallf7a1a742009-11-24 19:00:30 +0000261 "Caller should have completed object type");
Douglas Gregor1d7049a2012-01-12 16:11:24 +0000262
263 // Template names cannot appear inside an Objective-C class or object type.
264 if (ObjectType->isObjCObjectOrInterfaceType()) {
265 Found.clear();
266 return;
267 }
John McCallf7a1a742009-11-24 19:00:30 +0000268 } else if (SS.isSet()) {
269 // This nested-name-specifier occurs after another nested-name-specifier,
270 // so long into the context associated with the prior nested-name-specifier.
271 LookupCtx = computeDeclContext(SS, EnteringContext);
272 isDependent = isDependentScopeSpecifier(SS);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000273
John McCallf7a1a742009-11-24 19:00:30 +0000274 // The declaration context must be complete.
John McCall77bb1aa2010-05-01 00:40:08 +0000275 if (LookupCtx && RequireCompleteDeclContext(SS, LookupCtx))
John McCallf7a1a742009-11-24 19:00:30 +0000276 return;
277 }
278
279 bool ObjectTypeSearchedInScope = false;
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000280 bool AllowFunctionTemplatesInLookup = true;
John McCallf7a1a742009-11-24 19:00:30 +0000281 if (LookupCtx) {
282 // Perform "qualified" name lookup into the declaration context we
283 // computed, which is either the type of the base of a member access
284 // expression or the declaration context associated with a prior
285 // nested-name-specifier.
286 LookupQualifiedName(Found, LookupCtx);
John McCallf7a1a742009-11-24 19:00:30 +0000287 if (!ObjectType.isNull() && Found.empty()) {
288 // C++ [basic.lookup.classref]p1:
289 // In a class member access expression (5.2.5), if the . or -> token is
290 // immediately followed by an identifier followed by a <, the
291 // identifier must be looked up to determine whether the < is the
292 // beginning of a template argument list (14.2) or a less-than operator.
293 // The identifier is first looked up in the class of the object
294 // expression. If the identifier is not found, it is then looked up in
295 // the context of the entire postfix-expression and shall name a class
296 // or function template.
John McCallf7a1a742009-11-24 19:00:30 +0000297 if (S) LookupName(Found, S);
298 ObjectTypeSearchedInScope = true;
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000299 AllowFunctionTemplatesInLookup = false;
John McCallf7a1a742009-11-24 19:00:30 +0000300 }
Douglas Gregorf9f97a02010-07-16 16:54:17 +0000301 } else if (isDependent && (!S || ObjectType.isNull())) {
Douglas Gregor2e933882010-01-12 17:06:20 +0000302 // We cannot look into a dependent object type or nested nme
303 // specifier.
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000304 MemberOfUnknownSpecialization = true;
John McCallf7a1a742009-11-24 19:00:30 +0000305 return;
306 } else {
307 // Perform unqualified name lookup in the current scope.
308 LookupName(Found, S);
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000309
310 if (!ObjectType.isNull())
311 AllowFunctionTemplatesInLookup = false;
John McCallf7a1a742009-11-24 19:00:30 +0000312 }
313
Douglas Gregor2e933882010-01-12 17:06:20 +0000314 if (Found.empty() && !isDependent) {
Douglas Gregorbfea2392009-12-31 08:11:17 +0000315 // If we did not find any names, attempt to correct any typos.
316 DeclarationName Name = Found.getLookupName();
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000317 Found.clear();
Kaelyn Uhrainf8ec8c92012-01-13 23:10:36 +0000318 // Simple filter callback that, for keywords, only accepts the C++ *_cast
319 CorrectionCandidateCallback FilterCCC;
320 FilterCCC.WantTypeSpecifiers = false;
321 FilterCCC.WantExpressionKeywords = false;
322 FilterCCC.WantRemainingKeywords = false;
323 FilterCCC.WantCXXNamedCasts = true;
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000324 if (TypoCorrection Corrected = CorrectTypo(Found.getLookupNameInfo(),
325 Found.getLookupKind(), S, &SS,
Kaelyn Uhrain16e46dd2012-01-31 23:49:25 +0000326 FilterCCC, LookupCtx)) {
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000327 Found.setLookupName(Corrected.getCorrection());
328 if (Corrected.getCorrectionDecl())
329 Found.addDecl(Corrected.getCorrectionDecl());
Douglas Gregor312eadb2011-04-24 05:37:28 +0000330 FilterAcceptableTemplateNames(Found);
John McCallad00b772010-06-16 08:42:20 +0000331 if (!Found.empty()) {
David Blaikie4e4d0842012-03-11 07:00:24 +0000332 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
333 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts()));
Kaelyn Uhrainb2567dd2013-07-02 23:47:44 +0000334 if (LookupCtx) {
335 bool droppedSpecifier = Corrected.WillReplaceSpecifier() &&
336 Name.getAsString() == CorrectedStr;
Douglas Gregorbfea2392009-12-31 08:11:17 +0000337 Diag(Found.getNameLoc(), diag::err_no_member_template_suggest)
Kaelyn Uhrainb2567dd2013-07-02 23:47:44 +0000338 << Name << LookupCtx << droppedSpecifier << CorrectedQuotedStr
339 << SS.getRange()
David Blaikie6952c012012-10-12 20:00:44 +0000340 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(),
341 CorrectedStr);
Kaelyn Uhrainb2567dd2013-07-02 23:47:44 +0000342 } else {
Douglas Gregorbfea2392009-12-31 08:11:17 +0000343 Diag(Found.getNameLoc(), diag::err_no_template_suggest)
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000344 << Name << CorrectedQuotedStr
345 << FixItHint::CreateReplacement(Found.getNameLoc(), CorrectedStr);
Kaelyn Uhrainb2567dd2013-07-02 23:47:44 +0000346 }
Douglas Gregor67dd1d42010-01-07 00:17:44 +0000347 if (TemplateDecl *Template = Found.getAsSingle<TemplateDecl>())
348 Diag(Template->getLocation(), diag::note_previous_decl)
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000349 << CorrectedQuotedStr;
John McCallad00b772010-06-16 08:42:20 +0000350 }
Douglas Gregorbfea2392009-12-31 08:11:17 +0000351 } else {
Douglas Gregor12eb5d62010-06-29 19:27:42 +0000352 Found.setLookupName(Name);
Douglas Gregorbfea2392009-12-31 08:11:17 +0000353 }
354 }
355
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000356 FilterAcceptableTemplateNames(Found, AllowFunctionTemplatesInLookup);
Douglas Gregorf9f97a02010-07-16 16:54:17 +0000357 if (Found.empty()) {
358 if (isDependent)
359 MemberOfUnknownSpecialization = true;
John McCallf7a1a742009-11-24 19:00:30 +0000360 return;
Douglas Gregorf9f97a02010-07-16 16:54:17 +0000361 }
John McCallf7a1a742009-11-24 19:00:30 +0000362
Douglas Gregor05e60762012-05-01 20:23:02 +0000363 if (S && !ObjectType.isNull() && !ObjectTypeSearchedInScope &&
Richard Smith80ad52f2013-01-02 11:42:31 +0000364 !(getLangOpts().CPlusPlus11 && !Found.empty())) {
Douglas Gregor05e60762012-05-01 20:23:02 +0000365 // C++03 [basic.lookup.classref]p1:
John McCallf7a1a742009-11-24 19:00:30 +0000366 // [...] If the lookup in the class of the object expression finds a
367 // template, the name is also looked up in the context of the entire
368 // postfix-expression and [...]
369 //
Douglas Gregor05e60762012-05-01 20:23:02 +0000370 // Note: C++11 does not perform this second lookup.
John McCallf7a1a742009-11-24 19:00:30 +0000371 LookupResult FoundOuter(*this, Found.getLookupName(), Found.getNameLoc(),
372 LookupOrdinaryName);
373 LookupName(FoundOuter, S);
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000374 FilterAcceptableTemplateNames(FoundOuter, /*AllowFunctionTemplates=*/false);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000375
John McCallf7a1a742009-11-24 19:00:30 +0000376 if (FoundOuter.empty()) {
377 // - if the name is not found, the name found in the class of the
378 // object expression is used, otherwise
Douglas Gregora6d1e762011-08-10 21:59:45 +0000379 } else if (!FoundOuter.getAsSingle<ClassTemplateDecl>() ||
380 FoundOuter.isAmbiguous()) {
John McCallf7a1a742009-11-24 19:00:30 +0000381 // - if the name is found in the context of the entire
382 // postfix-expression and does not name a class template, the name
383 // found in the class of the object expression is used, otherwise
Douglas Gregora6d1e762011-08-10 21:59:45 +0000384 FoundOuter.clear();
John McCallad00b772010-06-16 08:42:20 +0000385 } else if (!Found.isSuppressingDiagnostics()) {
John McCallf7a1a742009-11-24 19:00:30 +0000386 // - if the name found is a class template, it must refer to the same
387 // entity as the one found in the class of the object expression,
388 // otherwise the program is ill-formed.
389 if (!Found.isSingleResult() ||
390 Found.getFoundDecl()->getCanonicalDecl()
391 != FoundOuter.getFoundDecl()->getCanonicalDecl()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000392 Diag(Found.getNameLoc(),
Jeffrey Yasskin21d07e42010-06-05 01:39:57 +0000393 diag::ext_nested_name_member_ref_lookup_ambiguous)
394 << Found.getLookupName()
395 << ObjectType;
John McCallf7a1a742009-11-24 19:00:30 +0000396 Diag(Found.getRepresentativeDecl()->getLocation(),
397 diag::note_ambig_member_ref_object_type)
398 << ObjectType;
399 Diag(FoundOuter.getFoundDecl()->getLocation(),
400 diag::note_ambig_member_ref_scope);
401
402 // Recover by taking the template that we found in the object
403 // expression's type.
404 }
405 }
406 }
407}
408
John McCall2f841ba2009-12-02 03:53:29 +0000409/// ActOnDependentIdExpression - Handle a dependent id-expression that
410/// was just parsed. This is only possible with an explicit scope
411/// specifier naming a dependent type.
John McCall60d7b3a2010-08-24 06:29:42 +0000412ExprResult
John McCallf7a1a742009-11-24 19:00:30 +0000413Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS,
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000414 SourceLocation TemplateKWLoc,
Abramo Bagnara25777432010-08-11 22:01:17 +0000415 const DeclarationNameInfo &NameInfo,
John McCall2f841ba2009-12-02 03:53:29 +0000416 bool isAddressOfOperand,
John McCallf7a1a742009-11-24 19:00:30 +0000417 const TemplateArgumentListInfo *TemplateArgs) {
John McCallea1471e2010-05-20 01:18:31 +0000418 DeclContext *DC = getFunctionLevelDeclContext();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000419
John McCall2f841ba2009-12-02 03:53:29 +0000420 if (!isAddressOfOperand &&
John McCallea1471e2010-05-20 01:18:31 +0000421 isa<CXXMethodDecl>(DC) &&
422 cast<CXXMethodDecl>(DC)->isInstance()) {
423 QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType(Context);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000424
John McCallf7a1a742009-11-24 19:00:30 +0000425 // Since the 'this' expression is synthesized, we don't need to
426 // perform the double-lookup check.
427 NamedDecl *FirstQualifierInScope = 0;
428
John McCallaa81e162009-12-01 22:10:20 +0000429 return Owned(CXXDependentScopeMemberExpr::Create(Context,
430 /*This*/ 0, ThisType,
431 /*IsArrow*/ true,
John McCallf7a1a742009-11-24 19:00:30 +0000432 /*Op*/ SourceLocation(),
Douglas Gregor7c3179c2011-02-28 18:50:33 +0000433 SS.getWithLocInContext(Context),
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000434 TemplateKWLoc,
John McCallf7a1a742009-11-24 19:00:30 +0000435 FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +0000436 NameInfo,
John McCallf7a1a742009-11-24 19:00:30 +0000437 TemplateArgs));
438 }
439
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000440 return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs);
John McCallf7a1a742009-11-24 19:00:30 +0000441}
442
John McCall60d7b3a2010-08-24 06:29:42 +0000443ExprResult
John McCallf7a1a742009-11-24 19:00:30 +0000444Sema::BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000445 SourceLocation TemplateKWLoc,
Abramo Bagnara25777432010-08-11 22:01:17 +0000446 const DeclarationNameInfo &NameInfo,
John McCallf7a1a742009-11-24 19:00:30 +0000447 const TemplateArgumentListInfo *TemplateArgs) {
448 return Owned(DependentScopeDeclRefExpr::Create(Context,
Douglas Gregor00cf3cc2011-02-25 20:49:16 +0000449 SS.getWithLocInContext(Context),
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000450 TemplateKWLoc,
Abramo Bagnara25777432010-08-11 22:01:17 +0000451 NameInfo,
John McCallf7a1a742009-11-24 19:00:30 +0000452 TemplateArgs));
Douglas Gregord6fb7ef2008-12-18 19:37:40 +0000453}
454
Douglas Gregor72c3f312008-12-05 18:15:24 +0000455/// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining
456/// that the template parameter 'PrevDecl' is being shadowed by a new
457/// declaration at location Loc. Returns true to indicate that this is
458/// an error, and false otherwise.
Douglas Gregorcb8f9512011-10-20 17:58:49 +0000459void Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl) {
Douglas Gregorf57172b2008-12-08 18:40:42 +0000460 assert(PrevDecl->isTemplateParameter() && "Not a template parameter");
Douglas Gregor72c3f312008-12-05 18:15:24 +0000461
462 // Microsoft Visual C++ permits template parameters to be shadowed.
David Blaikie4e4d0842012-03-11 07:00:24 +0000463 if (getLangOpts().MicrosoftExt)
Douglas Gregorcb8f9512011-10-20 17:58:49 +0000464 return;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000465
466 // C++ [temp.local]p4:
467 // A template-parameter shall not be redeclared within its
468 // scope (including nested scopes).
Mike Stump1eb44332009-09-09 15:08:12 +0000469 Diag(Loc, diag::err_template_param_shadow)
Douglas Gregor72c3f312008-12-05 18:15:24 +0000470 << cast<NamedDecl>(PrevDecl)->getDeclName();
471 Diag(PrevDecl->getLocation(), diag::note_template_param_here);
Douglas Gregorcb8f9512011-10-20 17:58:49 +0000472 return;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000473}
474
Douglas Gregor2943aed2009-03-03 04:44:36 +0000475/// AdjustDeclIfTemplate - If the given decl happens to be a template, reset
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000476/// the parameter D to reference the templated declaration and return a pointer
477/// to the template declaration. Otherwise, do nothing to D and return null.
John McCalld226f652010-08-21 09:40:31 +0000478TemplateDecl *Sema::AdjustDeclIfTemplate(Decl *&D) {
479 if (TemplateDecl *Temp = dyn_cast_or_null<TemplateDecl>(D)) {
480 D = Temp->getTemplatedDecl();
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000481 return Temp;
482 }
483 return 0;
484}
485
Douglas Gregorba68eca2011-01-05 17:40:24 +0000486ParsedTemplateArgument ParsedTemplateArgument::getTemplatePackExpansion(
487 SourceLocation EllipsisLoc) const {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000488 assert(Kind == Template &&
Douglas Gregorba68eca2011-01-05 17:40:24 +0000489 "Only template template arguments can be pack expansions here");
490 assert(getAsTemplate().get().containsUnexpandedParameterPack() &&
491 "Template template argument pack expansion without packs");
492 ParsedTemplateArgument Result(*this);
493 Result.EllipsisLoc = EllipsisLoc;
494 return Result;
495}
496
Douglas Gregor788cd062009-11-11 01:00:40 +0000497static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef,
498 const ParsedTemplateArgument &Arg) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000499
Douglas Gregor788cd062009-11-11 01:00:40 +0000500 switch (Arg.getKind()) {
501 case ParsedTemplateArgument::Type: {
John McCalla93c9342009-12-07 02:54:59 +0000502 TypeSourceInfo *DI;
Douglas Gregor788cd062009-11-11 01:00:40 +0000503 QualType T = SemaRef.GetTypeFromParser(Arg.getAsType(), &DI);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000504 if (!DI)
John McCalla93c9342009-12-07 02:54:59 +0000505 DI = SemaRef.Context.getTrivialTypeSourceInfo(T, Arg.getLocation());
Douglas Gregor788cd062009-11-11 01:00:40 +0000506 return TemplateArgumentLoc(TemplateArgument(T), DI);
507 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000508
Douglas Gregor788cd062009-11-11 01:00:40 +0000509 case ParsedTemplateArgument::NonType: {
510 Expr *E = static_cast<Expr *>(Arg.getAsExpr());
511 return TemplateArgumentLoc(TemplateArgument(E), E);
512 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000513
Douglas Gregor788cd062009-11-11 01:00:40 +0000514 case ParsedTemplateArgument::Template: {
John McCall2b5289b2010-08-23 07:28:44 +0000515 TemplateName Template = Arg.getAsTemplate().get();
Douglas Gregor2be29f42011-01-14 23:41:42 +0000516 TemplateArgument TArg;
517 if (Arg.getEllipsisLoc().isValid())
David Blaikiedc84cd52013-02-20 22:23:23 +0000518 TArg = TemplateArgument(Template, Optional<unsigned int>());
Douglas Gregor2be29f42011-01-14 23:41:42 +0000519 else
520 TArg = Template;
521 return TemplateArgumentLoc(TArg,
Douglas Gregorb6744ef2011-03-02 17:09:35 +0000522 Arg.getScopeSpec().getWithLocInContext(
523 SemaRef.Context),
Douglas Gregorba68eca2011-01-05 17:40:24 +0000524 Arg.getLocation(),
525 Arg.getEllipsisLoc());
Douglas Gregor788cd062009-11-11 01:00:40 +0000526 }
527 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000528
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +0000529 llvm_unreachable("Unhandled parsed template argument");
Douglas Gregor788cd062009-11-11 01:00:40 +0000530}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000531
Douglas Gregor788cd062009-11-11 01:00:40 +0000532/// \brief Translates template arguments as provided by the parser
533/// into template arguments used by semantic analysis.
John McCalld5532b62009-11-23 01:53:49 +0000534void Sema::translateTemplateArguments(const ASTTemplateArgsPtr &TemplateArgsIn,
535 TemplateArgumentListInfo &TemplateArgs) {
Douglas Gregor788cd062009-11-11 01:00:40 +0000536 for (unsigned I = 0, Last = TemplateArgsIn.size(); I != Last; ++I)
John McCalld5532b62009-11-23 01:53:49 +0000537 TemplateArgs.addArgument(translateTemplateArgument(*this,
538 TemplateArgsIn[I]));
Douglas Gregor788cd062009-11-11 01:00:40 +0000539}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000540
Richard Smithc7e863f2013-06-25 22:21:36 +0000541static void maybeDiagnoseTemplateParameterShadow(Sema &SemaRef, Scope *S,
542 SourceLocation Loc,
543 IdentifierInfo *Name) {
544 NamedDecl *PrevDecl = SemaRef.LookupSingleName(
545 S, Name, Loc, Sema::LookupOrdinaryName, Sema::ForRedeclaration);
546 if (PrevDecl && PrevDecl->isTemplateParameter())
547 SemaRef.DiagnoseTemplateParameterShadow(Loc, PrevDecl);
548}
549
Douglas Gregor72c3f312008-12-05 18:15:24 +0000550/// ActOnTypeParameter - Called when a C++ template type parameter
551/// (e.g., "typename T") has been parsed. Typename specifies whether
552/// the keyword "typename" was used to declare the type parameter
553/// (otherwise, "class" was used), and KeyLoc is the location of the
554/// "class" or "typename" keyword. ParamName is the name of the
555/// parameter (NULL indicates an unnamed template parameter) and
Chandler Carruth4fb86f82011-05-01 00:51:33 +0000556/// ParamNameLoc is the location of the parameter name (if any).
Douglas Gregor72c3f312008-12-05 18:15:24 +0000557/// If the type parameter has a default argument, it will be added
558/// later via ActOnTypeParameterDefault.
John McCalld226f652010-08-21 09:40:31 +0000559Decl *Sema::ActOnTypeParameter(Scope *S, bool Typename, bool Ellipsis,
560 SourceLocation EllipsisLoc,
561 SourceLocation KeyLoc,
562 IdentifierInfo *ParamName,
563 SourceLocation ParamNameLoc,
564 unsigned Depth, unsigned Position,
565 SourceLocation EqualLoc,
John McCallb3d87482010-08-24 05:47:05 +0000566 ParsedType DefaultArg) {
Mike Stump1eb44332009-09-09 15:08:12 +0000567 assert(S->isTemplateParamScope() &&
568 "Template type parameter not in template parameter scope!");
Douglas Gregor72c3f312008-12-05 18:15:24 +0000569 bool Invalid = false;
570
Douglas Gregorddc29e12009-02-06 22:42:48 +0000571 SourceLocation Loc = ParamNameLoc;
572 if (!ParamName)
573 Loc = KeyLoc;
574
Douglas Gregor72c3f312008-12-05 18:15:24 +0000575 TemplateTypeParmDecl *Param
John McCall7a9813c2010-01-22 00:28:27 +0000576 = TemplateTypeParmDecl::Create(Context, Context.getTranslationUnitDecl(),
Abramo Bagnara344577e2011-03-06 15:48:19 +0000577 KeyLoc, Loc, Depth, Position, ParamName,
578 Typename, Ellipsis);
Douglas Gregor9a299e02011-03-04 17:52:15 +0000579 Param->setAccess(AS_public);
Douglas Gregor72c3f312008-12-05 18:15:24 +0000580 if (Invalid)
581 Param->setInvalidDecl();
582
583 if (ParamName) {
Richard Smithc7e863f2013-06-25 22:21:36 +0000584 maybeDiagnoseTemplateParameterShadow(*this, S, ParamNameLoc, ParamName);
585
Douglas Gregor72c3f312008-12-05 18:15:24 +0000586 // Add the template parameter into the current scope.
John McCalld226f652010-08-21 09:40:31 +0000587 S->AddDecl(Param);
Douglas Gregor72c3f312008-12-05 18:15:24 +0000588 IdResolver.AddDecl(Param);
589 }
590
Douglas Gregor61c4d282011-01-05 15:48:55 +0000591 // C++0x [temp.param]p9:
592 // A default template-argument may be specified for any kind of
593 // template-parameter that is not a template parameter pack.
594 if (DefaultArg && Ellipsis) {
595 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
596 DefaultArg = ParsedType();
597 }
598
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000599 // Handle the default argument, if provided.
600 if (DefaultArg) {
601 TypeSourceInfo *DefaultTInfo;
602 GetTypeFromParser(DefaultArg, &DefaultTInfo);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000603
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000604 assert(DefaultTInfo && "expected source information for type");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000605
Douglas Gregor6f526752010-12-16 08:48:57 +0000606 // Check for unexpanded parameter packs.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000607 if (DiagnoseUnexpandedParameterPack(Loc, DefaultTInfo,
Douglas Gregor6f526752010-12-16 08:48:57 +0000608 UPPC_DefaultArgument))
609 return Param;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000610
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000611 // Check the template argument itself.
612 if (CheckTemplateArgument(Param, DefaultTInfo)) {
613 Param->setInvalidDecl();
John McCalld226f652010-08-21 09:40:31 +0000614 return Param;
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000615 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000616
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000617 Param->setDefaultArgument(DefaultTInfo, false);
618 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000619
John McCalld226f652010-08-21 09:40:31 +0000620 return Param;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000621}
622
Douglas Gregor2943aed2009-03-03 04:44:36 +0000623/// \brief Check that the type of a non-type template parameter is
624/// well-formed.
625///
626/// \returns the (possibly-promoted) parameter type if valid;
627/// otherwise, produces a diagnostic and returns a NULL type.
Mike Stump1eb44332009-09-09 15:08:12 +0000628QualType
Douglas Gregor2943aed2009-03-03 04:44:36 +0000629Sema::CheckNonTypeTemplateParameterType(QualType T, SourceLocation Loc) {
Douglas Gregora481ec42010-05-23 19:57:01 +0000630 // We don't allow variably-modified types as the type of non-type template
631 // parameters.
632 if (T->isVariablyModifiedType()) {
633 Diag(Loc, diag::err_variably_modified_nontype_template_param)
634 << T;
635 return QualType();
636 }
637
Douglas Gregor2943aed2009-03-03 04:44:36 +0000638 // C++ [temp.param]p4:
639 //
640 // A non-type template-parameter shall have one of the following
641 // (optionally cv-qualified) types:
642 //
643 // -- integral or enumeration type,
Douglas Gregor2ade35e2010-06-16 00:17:44 +0000644 if (T->isIntegralOrEnumerationType() ||
Mike Stump1eb44332009-09-09 15:08:12 +0000645 // -- pointer to object or pointer to function,
Eli Friedman13578692010-08-05 02:49:48 +0000646 T->isPointerType() ||
Mike Stump1eb44332009-09-09 15:08:12 +0000647 // -- reference to object or reference to function,
Douglas Gregor2943aed2009-03-03 04:44:36 +0000648 T->isReferenceType() ||
Douglas Gregor84ee2ee2011-05-21 23:15:46 +0000649 // -- pointer to member,
Douglas Gregor2943aed2009-03-03 04:44:36 +0000650 T->isMemberPointerType() ||
Douglas Gregor84ee2ee2011-05-21 23:15:46 +0000651 // -- std::nullptr_t.
652 T->isNullPtrType() ||
Douglas Gregor2943aed2009-03-03 04:44:36 +0000653 // If T is a dependent type, we can't do the check now, so we
654 // assume that it is well-formed.
Richard Smithe37f4842012-03-13 07:21:50 +0000655 T->isDependentType()) {
656 // C++ [temp.param]p5: The top-level cv-qualifiers on the template-parameter
657 // are ignored when determining its type.
658 return T.getUnqualifiedType();
659 }
660
Douglas Gregor2943aed2009-03-03 04:44:36 +0000661 // C++ [temp.param]p8:
662 //
663 // A non-type template-parameter of type "array of T" or
664 // "function returning T" is adjusted to be of type "pointer to
665 // T" or "pointer to function returning T", respectively.
666 else if (T->isArrayType())
667 // FIXME: Keep the type prior to promotion?
668 return Context.getArrayDecayedType(T);
669 else if (T->isFunctionType())
670 // FIXME: Keep the type prior to promotion?
671 return Context.getPointerType(T);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000672
Douglas Gregor2943aed2009-03-03 04:44:36 +0000673 Diag(Loc, diag::err_template_nontype_parm_bad_type)
674 << T;
675
676 return QualType();
677}
678
John McCalld226f652010-08-21 09:40:31 +0000679Decl *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
680 unsigned Depth,
681 unsigned Position,
682 SourceLocation EqualLoc,
John McCall9ae2f072010-08-23 23:25:46 +0000683 Expr *Default) {
John McCallbf1a0282010-06-04 23:28:52 +0000684 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
685 QualType T = TInfo->getType();
Douglas Gregor72c3f312008-12-05 18:15:24 +0000686
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000687 assert(S->isTemplateParamScope() &&
688 "Non-type template parameter not in template parameter scope!");
Douglas Gregor72c3f312008-12-05 18:15:24 +0000689 bool Invalid = false;
690
Douglas Gregor4d2abba2010-12-16 15:36:43 +0000691 T = CheckNonTypeTemplateParameterType(T, D.getIdentifierLoc());
692 if (T.isNull()) {
Douglas Gregor2943aed2009-03-03 04:44:36 +0000693 T = Context.IntTy; // Recover with an 'int' type.
Douglas Gregorceef30c2009-03-09 16:46:39 +0000694 Invalid = true;
695 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000696
Richard Smithc7e863f2013-06-25 22:21:36 +0000697 IdentifierInfo *ParamName = D.getIdentifier();
Douglas Gregor10738d32010-12-23 23:51:58 +0000698 bool IsParameterPack = D.hasEllipsis();
Douglas Gregor72c3f312008-12-05 18:15:24 +0000699 NonTypeTemplateParmDecl *Param
John McCall7a9813c2010-01-22 00:28:27 +0000700 = NonTypeTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
Daniel Dunbar96a00142012-03-09 18:35:03 +0000701 D.getLocStart(),
John McCall7a9813c2010-01-22 00:28:27 +0000702 D.getIdentifierLoc(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000703 Depth, Position, ParamName, T,
Douglas Gregor10738d32010-12-23 23:51:58 +0000704 IsParameterPack, TInfo);
Douglas Gregor9a299e02011-03-04 17:52:15 +0000705 Param->setAccess(AS_public);
Richard Smithc7e863f2013-06-25 22:21:36 +0000706
Douglas Gregor72c3f312008-12-05 18:15:24 +0000707 if (Invalid)
708 Param->setInvalidDecl();
709
Richard Smithc7e863f2013-06-25 22:21:36 +0000710 if (ParamName) {
711 maybeDiagnoseTemplateParameterShadow(*this, S, D.getIdentifierLoc(),
712 ParamName);
713
Douglas Gregor72c3f312008-12-05 18:15:24 +0000714 // Add the template parameter into the current scope.
John McCalld226f652010-08-21 09:40:31 +0000715 S->AddDecl(Param);
Douglas Gregor72c3f312008-12-05 18:15:24 +0000716 IdResolver.AddDecl(Param);
717 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000718
Douglas Gregor61c4d282011-01-05 15:48:55 +0000719 // C++0x [temp.param]p9:
720 // A default template-argument may be specified for any kind of
721 // template-parameter that is not a template parameter pack.
722 if (Default && IsParameterPack) {
723 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
724 Default = 0;
725 }
726
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000727 // Check the well-formedness of the default template argument, if provided.
Douglas Gregor10738d32010-12-23 23:51:58 +0000728 if (Default) {
Douglas Gregor6f526752010-12-16 08:48:57 +0000729 // Check for unexpanded parameter packs.
730 if (DiagnoseUnexpandedParameterPack(Default, UPPC_DefaultArgument))
731 return Param;
732
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000733 TemplateArgument Converted;
John Wiegley429bb272011-04-08 18:41:53 +0000734 ExprResult DefaultRes = CheckTemplateArgument(Param, Param->getType(), Default, Converted);
735 if (DefaultRes.isInvalid()) {
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000736 Param->setInvalidDecl();
John McCalld226f652010-08-21 09:40:31 +0000737 return Param;
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000738 }
John Wiegley429bb272011-04-08 18:41:53 +0000739 Default = DefaultRes.take();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000740
John McCall9ae2f072010-08-23 23:25:46 +0000741 Param->setDefaultArgument(Default, false);
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000742 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000743
John McCalld226f652010-08-21 09:40:31 +0000744 return Param;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000745}
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000746
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000747/// ActOnTemplateTemplateParameter - Called when a C++ template template
James Dennett699c9042012-06-15 07:13:21 +0000748/// parameter (e.g. T in template <template \<typename> class T> class array)
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000749/// has been parsed. S is the current scope.
John McCalld226f652010-08-21 09:40:31 +0000750Decl *Sema::ActOnTemplateTemplateParameter(Scope* S,
751 SourceLocation TmpLoc,
Richard Trieu90ab75b2011-09-09 03:18:59 +0000752 TemplateParameterList *Params,
Douglas Gregor61c4d282011-01-05 15:48:55 +0000753 SourceLocation EllipsisLoc,
John McCalld226f652010-08-21 09:40:31 +0000754 IdentifierInfo *Name,
755 SourceLocation NameLoc,
756 unsigned Depth,
757 unsigned Position,
758 SourceLocation EqualLoc,
Douglas Gregor61c4d282011-01-05 15:48:55 +0000759 ParsedTemplateArgument Default) {
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000760 assert(S->isTemplateParamScope() &&
761 "Template template parameter not in template parameter scope!");
762
763 // Construct the parameter object.
Douglas Gregor61c4d282011-01-05 15:48:55 +0000764 bool IsParameterPack = EllipsisLoc.isValid();
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000765 TemplateTemplateParmDecl *Param =
John McCall7a9813c2010-01-22 00:28:27 +0000766 TemplateTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000767 NameLoc.isInvalid()? TmpLoc : NameLoc,
768 Depth, Position, IsParameterPack,
Douglas Gregor61c4d282011-01-05 15:48:55 +0000769 Name, Params);
Douglas Gregor9a299e02011-03-04 17:52:15 +0000770 Param->setAccess(AS_public);
771
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000772 // If the template template parameter has a name, then link the identifier
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000773 // into the scope and lookup mechanisms.
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000774 if (Name) {
Richard Smithc7e863f2013-06-25 22:21:36 +0000775 maybeDiagnoseTemplateParameterShadow(*this, S, NameLoc, Name);
776
John McCalld226f652010-08-21 09:40:31 +0000777 S->AddDecl(Param);
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000778 IdResolver.AddDecl(Param);
779 }
780
Douglas Gregor6f526752010-12-16 08:48:57 +0000781 if (Params->size() == 0) {
782 Diag(Param->getLocation(), diag::err_template_template_parm_no_parms)
783 << SourceRange(Params->getLAngleLoc(), Params->getRAngleLoc());
784 Param->setInvalidDecl();
785 }
786
Douglas Gregor61c4d282011-01-05 15:48:55 +0000787 // C++0x [temp.param]p9:
788 // A default template-argument may be specified for any kind of
789 // template-parameter that is not a template parameter pack.
790 if (IsParameterPack && !Default.isInvalid()) {
791 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
792 Default = ParsedTemplateArgument();
793 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000794
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000795 if (!Default.isInvalid()) {
796 // Check only that we have a template template argument. We don't want to
797 // try to check well-formedness now, because our template template parameter
798 // might have dependent types in its template parameters, which we wouldn't
799 // be able to match now.
800 //
801 // If none of the template template parameter's template arguments mention
802 // other template parameters, we could actually perform more checking here.
803 // However, it isn't worth doing.
804 TemplateArgumentLoc DefaultArg = translateTemplateArgument(*this, Default);
805 if (DefaultArg.getArgument().getAsTemplate().isNull()) {
806 Diag(DefaultArg.getLocation(), diag::err_template_arg_not_class_template)
807 << DefaultArg.getSourceRange();
John McCalld226f652010-08-21 09:40:31 +0000808 return Param;
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000809 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000810
Douglas Gregor6f526752010-12-16 08:48:57 +0000811 // Check for unexpanded parameter packs.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000812 if (DiagnoseUnexpandedParameterPack(DefaultArg.getLocation(),
Douglas Gregor6f526752010-12-16 08:48:57 +0000813 DefaultArg.getArgument().getAsTemplate(),
814 UPPC_DefaultArgument))
815 return Param;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000816
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000817 Param->setDefaultArgument(DefaultArg, false);
Douglas Gregord684b002009-02-10 19:49:53 +0000818 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000819
John McCalld226f652010-08-21 09:40:31 +0000820 return Param;
Douglas Gregord684b002009-02-10 19:49:53 +0000821}
822
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000823/// ActOnTemplateParameterList - Builds a TemplateParameterList that
824/// contains the template parameters in Params/NumParams.
Richard Trieu90ab75b2011-09-09 03:18:59 +0000825TemplateParameterList *
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000826Sema::ActOnTemplateParameterList(unsigned Depth,
827 SourceLocation ExportLoc,
Mike Stump1eb44332009-09-09 15:08:12 +0000828 SourceLocation TemplateLoc,
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000829 SourceLocation LAngleLoc,
John McCalld226f652010-08-21 09:40:31 +0000830 Decl **Params, unsigned NumParams,
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000831 SourceLocation RAngleLoc) {
832 if (ExportLoc.isValid())
Douglas Gregor51ffb0c2009-11-25 18:55:14 +0000833 Diag(ExportLoc, diag::warn_template_export_unsupported);
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000834
Douglas Gregorddc29e12009-02-06 22:42:48 +0000835 return TemplateParameterList::Create(Context, TemplateLoc, LAngleLoc,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000836 (NamedDecl**)Params, NumParams,
Douglas Gregorbf4ea562009-09-15 16:23:51 +0000837 RAngleLoc);
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000838}
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000839
John McCallb6217662010-03-15 10:12:16 +0000840static void SetNestedNameSpecifier(TagDecl *T, const CXXScopeSpec &SS) {
841 if (SS.isSet())
Douglas Gregorc22b5ff2011-02-25 02:25:35 +0000842 T->setQualifierInfo(SS.getWithLocInContext(T->getASTContext()));
John McCallb6217662010-03-15 10:12:16 +0000843}
844
John McCallf312b1e2010-08-26 23:41:50 +0000845DeclResult
John McCall0f434ec2009-07-31 02:45:11 +0000846Sema::CheckClassTemplate(Scope *S, unsigned TagSpec, TagUseKind TUK,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +0000847 SourceLocation KWLoc, CXXScopeSpec &SS,
Douglas Gregorddc29e12009-02-06 22:42:48 +0000848 IdentifierInfo *Name, SourceLocation NameLoc,
849 AttributeList *Attr,
Douglas Gregor05396e22009-08-25 17:23:04 +0000850 TemplateParameterList *TemplateParams,
Douglas Gregore7612302011-09-09 19:05:14 +0000851 AccessSpecifier AS, SourceLocation ModulePrivateLoc,
Abramo Bagnarac57c17d2011-03-10 13:28:31 +0000852 unsigned NumOuterTemplateParamLists,
853 TemplateParameterList** OuterTemplateParamLists) {
Mike Stump1eb44332009-09-09 15:08:12 +0000854 assert(TemplateParams && TemplateParams->size() > 0 &&
Douglas Gregor05396e22009-08-25 17:23:04 +0000855 "No template parameters");
John McCall0f434ec2009-07-31 02:45:11 +0000856 assert(TUK != TUK_Reference && "Can only declare or define class templates");
Douglas Gregord684b002009-02-10 19:49:53 +0000857 bool Invalid = false;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000858
859 // Check that we can declare a template here.
Douglas Gregor05396e22009-08-25 17:23:04 +0000860 if (CheckTemplateDeclScope(S, TemplateParams))
Douglas Gregor212e81c2009-03-25 00:13:59 +0000861 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000862
Abramo Bagnara465d41b2010-05-11 21:36:43 +0000863 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
864 assert(Kind != TTK_Enum && "can't build template of enumerated type");
Douglas Gregorddc29e12009-02-06 22:42:48 +0000865
866 // There is no such thing as an unnamed class template.
867 if (!Name) {
868 Diag(KWLoc, diag::err_template_unnamed_class);
Douglas Gregor212e81c2009-03-25 00:13:59 +0000869 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000870 }
871
Richard Smith71c598f2012-04-21 01:27:54 +0000872 // Find any previous declaration with this name. For a friend with no
873 // scope explicitly specified, we only look for tag declarations (per
874 // C++11 [basic.lookup.elab]p2).
Douglas Gregor05396e22009-08-25 17:23:04 +0000875 DeclContext *SemanticContext;
Richard Smith71c598f2012-04-21 01:27:54 +0000876 LookupResult Previous(*this, Name, NameLoc,
877 (SS.isEmpty() && TUK == TUK_Friend)
878 ? LookupTagName : LookupOrdinaryName,
John McCall7d384dd2009-11-18 07:57:50 +0000879 ForRedeclaration);
Douglas Gregor05396e22009-08-25 17:23:04 +0000880 if (SS.isNotEmpty() && !SS.isInvalid()) {
881 SemanticContext = computeDeclContext(SS, true);
882 if (!SemanticContext) {
Douglas Gregor8b0fa522012-03-30 16:20:47 +0000883 // FIXME: Horrible, horrible hack! We can't currently represent this
884 // in the AST, and historically we have just ignored such friend
885 // class templates, so don't complain here.
886 if (TUK != TUK_Friend)
887 Diag(NameLoc, diag::err_template_qualified_declarator_no_match)
888 << SS.getScopeRep() << SS.getRange();
Douglas Gregor05396e22009-08-25 17:23:04 +0000889 return true;
890 }
Mike Stump1eb44332009-09-09 15:08:12 +0000891
John McCall77bb1aa2010-05-01 00:40:08 +0000892 if (RequireCompleteDeclContext(SS, SemanticContext))
893 return true;
894
Douglas Gregor20606502011-10-14 15:31:12 +0000895 // If we're adding a template to a dependent context, we may need to
896 // rebuilding some of the types used within the template parameter list,
897 // now that we know what the current instantiation is.
898 if (SemanticContext->isDependentContext()) {
899 ContextRAII SavedContext(*this, SemanticContext);
900 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams))
901 Invalid = true;
Douglas Gregor69605872012-03-28 16:01:27 +0000902 } else if (TUK != TUK_Friend && TUK != TUK_Reference)
903 diagnoseQualifiedDeclaration(SS, SemanticContext, Name, NameLoc);
Richard Smith71c598f2012-04-21 01:27:54 +0000904
John McCalla24dc2e2009-11-17 02:14:36 +0000905 LookupQualifiedName(Previous, SemanticContext);
Douglas Gregor05396e22009-08-25 17:23:04 +0000906 } else {
907 SemanticContext = CurContext;
John McCalla24dc2e2009-11-17 02:14:36 +0000908 LookupName(Previous, S);
Douglas Gregor05396e22009-08-25 17:23:04 +0000909 }
Mike Stump1eb44332009-09-09 15:08:12 +0000910
Douglas Gregor57265e32010-04-12 16:00:01 +0000911 if (Previous.isAmbiguous())
912 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000913
Douglas Gregorddc29e12009-02-06 22:42:48 +0000914 NamedDecl *PrevDecl = 0;
915 if (Previous.begin() != Previous.end())
Douglas Gregor57265e32010-04-12 16:00:01 +0000916 PrevDecl = (*Previous.begin())->getUnderlyingDecl();
Douglas Gregorddc29e12009-02-06 22:42:48 +0000917
Douglas Gregorddc29e12009-02-06 22:42:48 +0000918 // If there is a previous declaration with the same name, check
919 // whether this is a valid redeclaration.
Mike Stump1eb44332009-09-09 15:08:12 +0000920 ClassTemplateDecl *PrevClassTemplate
Douglas Gregorddc29e12009-02-06 22:42:48 +0000921 = dyn_cast_or_null<ClassTemplateDecl>(PrevDecl);
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000922
923 // We may have found the injected-class-name of a class template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000924 // class template partial specialization, or class template specialization.
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000925 // In these cases, grab the template that is being defined or specialized.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000926 if (!PrevClassTemplate && PrevDecl && isa<CXXRecordDecl>(PrevDecl) &&
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000927 cast<CXXRecordDecl>(PrevDecl)->isInjectedClassName()) {
928 PrevDecl = cast<CXXRecordDecl>(PrevDecl->getDeclContext());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000929 PrevClassTemplate
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000930 = cast<CXXRecordDecl>(PrevDecl)->getDescribedClassTemplate();
931 if (!PrevClassTemplate && isa<ClassTemplateSpecializationDecl>(PrevDecl)) {
932 PrevClassTemplate
933 = cast<ClassTemplateSpecializationDecl>(PrevDecl)
934 ->getSpecializedTemplate();
935 }
936 }
937
John McCall65c49462009-12-18 11:25:59 +0000938 if (TUK == TUK_Friend) {
John McCalle129d442009-12-17 23:21:11 +0000939 // C++ [namespace.memdef]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000940 // [...] When looking for a prior declaration of a class or a function
941 // declared as a friend, and when the name of the friend class or
John McCalle129d442009-12-17 23:21:11 +0000942 // function is neither a qualified name nor a template-id, scopes outside
943 // the innermost enclosing namespace scope are not considered.
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000944 if (!SS.isSet()) {
945 DeclContext *OutermostContext = CurContext;
946 while (!OutermostContext->isFileContext())
947 OutermostContext = OutermostContext->getLookupParent();
John McCall65c49462009-12-18 11:25:59 +0000948
Richard Smithc93e0142012-04-20 07:12:26 +0000949 if (PrevDecl &&
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000950 (OutermostContext->Equals(PrevDecl->getDeclContext()) ||
951 OutermostContext->Encloses(PrevDecl->getDeclContext()))) {
952 SemanticContext = PrevDecl->getDeclContext();
953 } else {
954 // Declarations in outer scopes don't matter. However, the outermost
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000955 // context we computed is the semantic context for our new
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000956 // declaration.
957 PrevDecl = PrevClassTemplate = 0;
958 SemanticContext = OutermostContext;
Richard Smith71c598f2012-04-21 01:27:54 +0000959
960 // Check that the chosen semantic context doesn't already contain a
961 // declaration of this name as a non-tag type.
962 LookupResult Previous(*this, Name, NameLoc, LookupOrdinaryName,
963 ForRedeclaration);
964 DeclContext *LookupContext = SemanticContext;
965 while (LookupContext->isTransparentContext())
966 LookupContext = LookupContext->getLookupParent();
967 LookupQualifiedName(Previous, LookupContext);
968
969 if (Previous.isAmbiguous())
970 return true;
971
972 if (Previous.begin() != Previous.end())
973 PrevDecl = (*Previous.begin())->getUnderlyingDecl();
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000974 }
John McCalle129d442009-12-17 23:21:11 +0000975 }
John McCalle129d442009-12-17 23:21:11 +0000976 } else if (PrevDecl && !isDeclInScope(PrevDecl, SemanticContext, S))
977 PrevDecl = PrevClassTemplate = 0;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000978
Douglas Gregorddc29e12009-02-06 22:42:48 +0000979 if (PrevClassTemplate) {
Richard Smith6e21b162012-04-22 02:13:50 +0000980 // Ensure that the template parameter lists are compatible. Skip this check
981 // for a friend in a dependent context: the template parameter list itself
982 // could be dependent.
983 if (!(TUK == TUK_Friend && CurContext->isDependentContext()) &&
984 !TemplateParameterListsAreEqual(TemplateParams,
Douglas Gregorddc29e12009-02-06 22:42:48 +0000985 PrevClassTemplate->getTemplateParameters(),
Douglas Gregorfb898e12009-11-12 16:20:59 +0000986 /*Complain=*/true,
987 TPL_TemplateMatch))
Douglas Gregor212e81c2009-03-25 00:13:59 +0000988 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000989
990 // C++ [temp.class]p4:
991 // In a redeclaration, partial specialization, explicit
992 // specialization or explicit instantiation of a class template,
993 // the class-key shall agree in kind with the original class
994 // template declaration (7.1.5.3).
995 RecordDecl *PrevRecordDecl = PrevClassTemplate->getTemplatedDecl();
Richard Trieubbf34c02011-06-10 03:11:26 +0000996 if (!isAcceptableTagRedeclaration(PrevRecordDecl, Kind,
997 TUK == TUK_Definition, KWLoc, *Name)) {
Mike Stump1eb44332009-09-09 15:08:12 +0000998 Diag(KWLoc, diag::err_use_with_wrong_tag)
Douglas Gregora3a83512009-04-01 23:51:29 +0000999 << Name
Douglas Gregor849b2432010-03-31 17:46:05 +00001000 << FixItHint::CreateReplacement(KWLoc, PrevRecordDecl->getKindName());
Douglas Gregorddc29e12009-02-06 22:42:48 +00001001 Diag(PrevRecordDecl->getLocation(), diag::note_previous_use);
Douglas Gregora3a83512009-04-01 23:51:29 +00001002 Kind = PrevRecordDecl->getTagKind();
Douglas Gregorddc29e12009-02-06 22:42:48 +00001003 }
1004
Douglas Gregorddc29e12009-02-06 22:42:48 +00001005 // Check for redefinition of this class template.
John McCall0f434ec2009-07-31 02:45:11 +00001006 if (TUK == TUK_Definition) {
Douglas Gregor952b0172010-02-11 01:04:33 +00001007 if (TagDecl *Def = PrevRecordDecl->getDefinition()) {
Douglas Gregorddc29e12009-02-06 22:42:48 +00001008 Diag(NameLoc, diag::err_redefinition) << Name;
1009 Diag(Def->getLocation(), diag::note_previous_definition);
1010 // FIXME: Would it make sense to try to "forget" the previous
1011 // definition, as part of error recovery?
Douglas Gregor212e81c2009-03-25 00:13:59 +00001012 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +00001013 }
Douglas Gregor6311d2b2011-09-09 18:32:39 +00001014 }
Douglas Gregorddc29e12009-02-06 22:42:48 +00001015 } else if (PrevDecl && PrevDecl->isTemplateParameter()) {
1016 // Maybe we will complain about the shadowed template parameter.
1017 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl);
1018 // Just pretend that we didn't see the previous declaration.
1019 PrevDecl = 0;
1020 } else if (PrevDecl) {
1021 // C++ [temp]p5:
1022 // A class template shall not have the same name as any other
1023 // template, class, function, object, enumeration, enumerator,
1024 // namespace, or type in the same scope (3.3), except as specified
1025 // in (14.5.4).
1026 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
1027 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
Douglas Gregor212e81c2009-03-25 00:13:59 +00001028 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +00001029 }
1030
Douglas Gregord684b002009-02-10 19:49:53 +00001031 // Check the template parameter list of this declaration, possibly
1032 // merging in the template parameter list from the previous class
Richard Smith6e21b162012-04-22 02:13:50 +00001033 // template declaration. Skip this check for a friend in a dependent
1034 // context, because the template parameter list might be dependent.
1035 if (!(TUK == TUK_Friend && CurContext->isDependentContext()) &&
David Majnemer87b12b22013-06-25 22:08:55 +00001036 CheckTemplateParameterList(
1037 TemplateParams,
1038 PrevClassTemplate ? PrevClassTemplate->getTemplateParameters() : 0,
1039 (SS.isSet() && SemanticContext && SemanticContext->isRecord() &&
1040 SemanticContext->isDependentContext())
1041 ? TPC_ClassTemplateMember
1042 : TUK == TUK_Friend ? TPC_FriendClassTemplate
1043 : TPC_ClassTemplate))
Douglas Gregord684b002009-02-10 19:49:53 +00001044 Invalid = true;
Mike Stump1eb44332009-09-09 15:08:12 +00001045
Douglas Gregor57265e32010-04-12 16:00:01 +00001046 if (SS.isSet()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001047 // If the name of the template was qualified, we must be defining the
Douglas Gregor57265e32010-04-12 16:00:01 +00001048 // template out-of-line.
Richard Smith6e21b162012-04-22 02:13:50 +00001049 if (!SS.isInvalid() && !Invalid && !PrevClassTemplate) {
1050 Diag(NameLoc, TUK == TUK_Friend ? diag::err_friend_decl_does_not_match
1051 : diag::err_member_def_does_not_match)
Douglas Gregor57265e32010-04-12 16:00:01 +00001052 << Name << SemanticContext << SS.getRange();
Douglas Gregorea9f54a2011-11-01 21:35:16 +00001053 Invalid = true;
1054 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001055 }
1056
Mike Stump1eb44332009-09-09 15:08:12 +00001057 CXXRecordDecl *NewClass =
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00001058 CXXRecordDecl::Create(Context, Kind, SemanticContext, KWLoc, NameLoc, Name,
Mike Stump1eb44332009-09-09 15:08:12 +00001059 PrevClassTemplate?
Douglas Gregoraafc0cc2009-05-15 19:11:46 +00001060 PrevClassTemplate->getTemplatedDecl() : 0,
1061 /*DelayTypeCreation=*/true);
John McCallb6217662010-03-15 10:12:16 +00001062 SetNestedNameSpecifier(NewClass, SS);
Abramo Bagnarac57c17d2011-03-10 13:28:31 +00001063 if (NumOuterTemplateParamLists > 0)
1064 NewClass->setTemplateParameterListsInfo(Context,
1065 NumOuterTemplateParamLists,
1066 OuterTemplateParamLists);
Douglas Gregorddc29e12009-02-06 22:42:48 +00001067
Eli Friedman572ae0a2012-02-10 02:02:21 +00001068 // Add alignment attributes if necessary; these attributes are checked when
1069 // the ASTContext lays out the structure.
Eli Friedman2016c8c2012-08-08 21:08:34 +00001070 if (TUK == TUK_Definition) {
1071 AddAlignmentAttributesForRecord(NewClass);
1072 AddMsStructLayoutForRecord(NewClass);
1073 }
Eli Friedman572ae0a2012-02-10 02:02:21 +00001074
Douglas Gregorddc29e12009-02-06 22:42:48 +00001075 ClassTemplateDecl *NewTemplate
1076 = ClassTemplateDecl::Create(Context, SemanticContext, NameLoc,
1077 DeclarationName(Name), TemplateParams,
Douglas Gregor5953d8b2009-03-19 17:26:29 +00001078 NewClass, PrevClassTemplate);
Douglas Gregorbefc20e2009-03-26 00:10:35 +00001079 NewClass->setDescribedClassTemplate(NewTemplate);
Douglas Gregor6311d2b2011-09-09 18:32:39 +00001080
Douglas Gregor2ccd89c2011-12-20 18:11:52 +00001081 if (ModulePrivateLoc.isValid())
Douglas Gregor6311d2b2011-09-09 18:32:39 +00001082 NewTemplate->setModulePrivate();
Douglas Gregor8d267c52011-09-09 02:06:17 +00001083
Douglas Gregoraafc0cc2009-05-15 19:11:46 +00001084 // Build the type for the class template declaration now.
Douglas Gregor24bae922010-07-08 18:37:38 +00001085 QualType T = NewTemplate->getInjectedClassNameSpecialization();
John McCall3cb0ebd2010-03-10 03:28:59 +00001086 T = Context.getInjectedClassNameType(NewClass, T);
Douglas Gregoraafc0cc2009-05-15 19:11:46 +00001087 assert(T->isDependentType() && "Class template type is not dependent?");
1088 (void)T;
1089
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001090 // If we are providing an explicit specialization of a member that is a
Douglas Gregorfd056bc2009-10-13 16:30:37 +00001091 // class template, make a note of that.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001092 if (PrevClassTemplate &&
Douglas Gregorfd056bc2009-10-13 16:30:37 +00001093 PrevClassTemplate->getInstantiatedFromMemberTemplate())
1094 PrevClassTemplate->setMemberSpecialization();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001095
Anders Carlsson4cbe82c2009-03-26 01:24:28 +00001096 // Set the access specifier.
Douglas Gregor42acead2012-03-17 23:06:31 +00001097 if (!Invalid && TUK != TUK_Friend && NewTemplate->getDeclContext()->isRecord())
John McCall05b23ea2009-09-14 21:59:20 +00001098 SetMemberAccessSpecifier(NewTemplate, PrevClassTemplate, AS);
Mike Stump1eb44332009-09-09 15:08:12 +00001099
Douglas Gregorddc29e12009-02-06 22:42:48 +00001100 // Set the lexical context of these templates
1101 NewClass->setLexicalDeclContext(CurContext);
1102 NewTemplate->setLexicalDeclContext(CurContext);
1103
John McCall0f434ec2009-07-31 02:45:11 +00001104 if (TUK == TUK_Definition)
Douglas Gregorddc29e12009-02-06 22:42:48 +00001105 NewClass->startDefinition();
1106
1107 if (Attr)
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00001108 ProcessDeclAttributeList(S, NewClass, Attr);
Douglas Gregorddc29e12009-02-06 22:42:48 +00001109
Rafael Espindola4bda1d82012-08-22 14:52:14 +00001110 if (PrevClassTemplate)
1111 mergeDeclAttributes(NewClass, PrevClassTemplate->getTemplatedDecl());
1112
Rafael Espindola6b603702012-07-13 18:04:45 +00001113 AddPushedVisibilityAttribute(NewClass);
1114
John McCall05b23ea2009-09-14 21:59:20 +00001115 if (TUK != TUK_Friend)
1116 PushOnScopeChains(NewTemplate, S);
1117 else {
Douglas Gregord85bea22009-09-26 06:47:28 +00001118 if (PrevClassTemplate && PrevClassTemplate->getAccess() != AS_none) {
John McCall05b23ea2009-09-14 21:59:20 +00001119 NewTemplate->setAccess(PrevClassTemplate->getAccess());
Douglas Gregord85bea22009-09-26 06:47:28 +00001120 NewClass->setAccess(PrevClassTemplate->getAccess());
1121 }
John McCall05b23ea2009-09-14 21:59:20 +00001122
Richard Smith22050f22013-07-17 23:53:16 +00001123 NewTemplate->setObjectOfFriendDecl();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001124
John McCall05b23ea2009-09-14 21:59:20 +00001125 // Friend templates are visible in fairly strange ways.
1126 if (!CurContext->isDependentContext()) {
Sebastian Redl7a126a42010-08-31 00:36:30 +00001127 DeclContext *DC = SemanticContext->getRedeclContext();
Richard Smith1b7f9cb2012-03-13 03:12:56 +00001128 DC->makeDeclVisibleInContext(NewTemplate);
John McCall05b23ea2009-09-14 21:59:20 +00001129 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
1130 PushOnScopeChains(NewTemplate, EnclosingScope,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001131 /* AddToContext = */ false);
John McCall05b23ea2009-09-14 21:59:20 +00001132 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001133
Douglas Gregord85bea22009-09-26 06:47:28 +00001134 FriendDecl *Friend = FriendDecl::Create(Context, CurContext,
1135 NewClass->getLocation(),
1136 NewTemplate,
1137 /*FIXME:*/NewClass->getLocation());
1138 Friend->setAccess(AS_public);
1139 CurContext->addDecl(Friend);
John McCall05b23ea2009-09-14 21:59:20 +00001140 }
Douglas Gregorddc29e12009-02-06 22:42:48 +00001141
Douglas Gregord684b002009-02-10 19:49:53 +00001142 if (Invalid) {
1143 NewTemplate->setInvalidDecl();
1144 NewClass->setInvalidDecl();
1145 }
Rafael Espindolad3d02dd2012-07-13 01:19:08 +00001146
Dmitri Gribenko96b09862012-07-31 22:37:06 +00001147 ActOnDocumentableDecl(NewTemplate);
1148
John McCalld226f652010-08-21 09:40:31 +00001149 return NewTemplate;
Douglas Gregorddc29e12009-02-06 22:42:48 +00001150}
1151
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001152/// \brief Diagnose the presence of a default template argument on a
1153/// template parameter, which is ill-formed in certain contexts.
1154///
1155/// \returns true if the default template argument should be dropped.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001156static bool DiagnoseDefaultTemplateArgument(Sema &S,
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001157 Sema::TemplateParamListContext TPC,
1158 SourceLocation ParamLoc,
1159 SourceRange DefArgRange) {
1160 switch (TPC) {
1161 case Sema::TPC_ClassTemplate:
Richard Smith3e4c6c42011-05-05 21:57:07 +00001162 case Sema::TPC_TypeAliasTemplate:
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001163 return false;
1164
1165 case Sema::TPC_FunctionTemplate:
Douglas Gregord89d86f2011-02-04 04:20:44 +00001166 case Sema::TPC_FriendFunctionTemplateDefinition:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001167 // C++ [temp.param]p9:
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001168 // A default template-argument shall not be specified in a
1169 // function template declaration or a function template
1170 // definition [...]
Douglas Gregord89d86f2011-02-04 04:20:44 +00001171 // If a friend function template declaration specifies a default
1172 // template-argument, that declaration shall be a definition and shall be
1173 // the only declaration of the function template in the translation unit.
1174 // (C++98/03 doesn't have this wording; see DR226).
Richard Smith80ad52f2013-01-02 11:42:31 +00001175 S.Diag(ParamLoc, S.getLangOpts().CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00001176 diag::warn_cxx98_compat_template_parameter_default_in_function_template
1177 : diag::ext_template_parameter_default_in_function_template)
1178 << DefArgRange;
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001179 return false;
1180
1181 case Sema::TPC_ClassTemplateMember:
1182 // C++0x [temp.param]p9:
1183 // A default template-argument shall not be specified in the
1184 // template-parameter-lists of the definition of a member of a
1185 // class template that appears outside of the member's class.
1186 S.Diag(ParamLoc, diag::err_template_parameter_default_template_member)
1187 << DefArgRange;
1188 return true;
1189
David Majnemer87b12b22013-06-25 22:08:55 +00001190 case Sema::TPC_FriendClassTemplate:
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001191 case Sema::TPC_FriendFunctionTemplate:
1192 // C++ [temp.param]p9:
1193 // A default template-argument shall not be specified in a
1194 // friend template declaration.
1195 S.Diag(ParamLoc, diag::err_template_parameter_default_friend_template)
1196 << DefArgRange;
1197 return true;
1198
1199 // FIXME: C++0x [temp.param]p9 allows default template-arguments
1200 // for friend function templates if there is only a single
1201 // declaration (and it is a definition). Strange!
1202 }
1203
David Blaikie7530c032012-01-17 06:56:22 +00001204 llvm_unreachable("Invalid TemplateParamListContext!");
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001205}
1206
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001207/// \brief Check for unexpanded parameter packs within the template parameters
1208/// of a template template parameter, recursively.
Benjamin Kramerda57f3e2011-03-26 12:38:21 +00001209static bool DiagnoseUnexpandedParameterPacks(Sema &S,
1210 TemplateTemplateParmDecl *TTP) {
Richard Smith6964b3f2012-09-07 02:06:42 +00001211 // A template template parameter which is a parameter pack is also a pack
1212 // expansion.
1213 if (TTP->isParameterPack())
1214 return false;
1215
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001216 TemplateParameterList *Params = TTP->getTemplateParameters();
1217 for (unsigned I = 0, N = Params->size(); I != N; ++I) {
1218 NamedDecl *P = Params->getParam(I);
1219 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
Richard Smith6964b3f2012-09-07 02:06:42 +00001220 if (!NTTP->isParameterPack() &&
1221 S.DiagnoseUnexpandedParameterPack(NTTP->getLocation(),
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001222 NTTP->getTypeSourceInfo(),
1223 Sema::UPPC_NonTypeTemplateParameterType))
1224 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001225
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001226 continue;
1227 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001228
1229 if (TemplateTemplateParmDecl *InnerTTP
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001230 = dyn_cast<TemplateTemplateParmDecl>(P))
1231 if (DiagnoseUnexpandedParameterPacks(S, InnerTTP))
1232 return true;
1233 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001234
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001235 return false;
1236}
1237
Douglas Gregord684b002009-02-10 19:49:53 +00001238/// \brief Checks the validity of a template parameter list, possibly
1239/// considering the template parameter list from a previous
1240/// declaration.
1241///
1242/// If an "old" template parameter list is provided, it must be
1243/// equivalent (per TemplateParameterListsAreEqual) to the "new"
1244/// template parameter list.
1245///
1246/// \param NewParams Template parameter list for a new template
1247/// declaration. This template parameter list will be updated with any
1248/// default arguments that are carried through from the previous
1249/// template parameter list.
1250///
1251/// \param OldParams If provided, template parameter list from a
1252/// previous declaration of the same template. Default template
1253/// arguments will be merged from the old template parameter list to
1254/// the new template parameter list.
1255///
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001256/// \param TPC Describes the context in which we are checking the given
1257/// template parameter list.
1258///
Douglas Gregord684b002009-02-10 19:49:53 +00001259/// \returns true if an error occurred, false otherwise.
1260bool Sema::CheckTemplateParameterList(TemplateParameterList *NewParams,
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001261 TemplateParameterList *OldParams,
1262 TemplateParamListContext TPC) {
Douglas Gregord684b002009-02-10 19:49:53 +00001263 bool Invalid = false;
Mike Stump1eb44332009-09-09 15:08:12 +00001264
Douglas Gregord684b002009-02-10 19:49:53 +00001265 // C++ [temp.param]p10:
1266 // The set of default template-arguments available for use with a
1267 // template declaration or definition is obtained by merging the
1268 // default arguments from the definition (if in scope) and all
1269 // declarations in scope in the same way default function
1270 // arguments are (8.3.6).
1271 bool SawDefaultArgument = false;
1272 SourceLocation PreviousDefaultArgLoc;
Douglas Gregorc15cb382009-02-09 23:23:08 +00001273
Mike Stump1a35fde2009-02-11 23:03:27 +00001274 // Dummy initialization to avoid warnings.
Douglas Gregor1bc69132009-02-11 20:46:19 +00001275 TemplateParameterList::iterator OldParam = NewParams->end();
Douglas Gregord684b002009-02-10 19:49:53 +00001276 if (OldParams)
1277 OldParam = OldParams->begin();
1278
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001279 bool RemoveDefaultArguments = false;
Douglas Gregord684b002009-02-10 19:49:53 +00001280 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
1281 NewParamEnd = NewParams->end();
1282 NewParam != NewParamEnd; ++NewParam) {
1283 // Variables used to diagnose redundant default arguments
1284 bool RedundantDefaultArg = false;
1285 SourceLocation OldDefaultLoc;
1286 SourceLocation NewDefaultLoc;
1287
David Blaikie1368e582011-10-19 05:19:50 +00001288 // Variable used to diagnose missing default arguments
Douglas Gregord684b002009-02-10 19:49:53 +00001289 bool MissingDefaultArg = false;
1290
David Blaikie1368e582011-10-19 05:19:50 +00001291 // Variable used to diagnose non-final parameter packs
1292 bool SawParameterPack = false;
Anders Carlsson49d25572009-06-12 23:20:15 +00001293
Douglas Gregord684b002009-02-10 19:49:53 +00001294 if (TemplateTypeParmDecl *NewTypeParm
1295 = dyn_cast<TemplateTypeParmDecl>(*NewParam)) {
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001296 // Check the presence of a default argument here.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001297 if (NewTypeParm->hasDefaultArgument() &&
1298 DiagnoseDefaultTemplateArgument(*this, TPC,
1299 NewTypeParm->getLocation(),
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001300 NewTypeParm->getDefaultArgumentInfo()->getTypeLoc()
Abramo Bagnarabd054db2010-05-20 10:00:11 +00001301 .getSourceRange()))
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001302 NewTypeParm->removeDefaultArgument();
1303
1304 // Merge default arguments for template type parameters.
Mike Stump1eb44332009-09-09 15:08:12 +00001305 TemplateTypeParmDecl *OldTypeParm
Douglas Gregord684b002009-02-10 19:49:53 +00001306 = OldParams? cast<TemplateTypeParmDecl>(*OldParam) : 0;
Mike Stump1eb44332009-09-09 15:08:12 +00001307
Anders Carlsson49d25572009-06-12 23:20:15 +00001308 if (NewTypeParm->isParameterPack()) {
1309 assert(!NewTypeParm->hasDefaultArgument() &&
1310 "Parameter packs can't have a default argument!");
1311 SawParameterPack = true;
Mike Stump1eb44332009-09-09 15:08:12 +00001312 } else if (OldTypeParm && OldTypeParm->hasDefaultArgument() &&
John McCall833ca992009-10-29 08:12:44 +00001313 NewTypeParm->hasDefaultArgument()) {
Douglas Gregord684b002009-02-10 19:49:53 +00001314 OldDefaultLoc = OldTypeParm->getDefaultArgumentLoc();
1315 NewDefaultLoc = NewTypeParm->getDefaultArgumentLoc();
1316 SawDefaultArgument = true;
1317 RedundantDefaultArg = true;
1318 PreviousDefaultArgLoc = NewDefaultLoc;
1319 } else if (OldTypeParm && OldTypeParm->hasDefaultArgument()) {
1320 // Merge the default argument from the old declaration to the
1321 // new declaration.
John McCall833ca992009-10-29 08:12:44 +00001322 NewTypeParm->setDefaultArgument(OldTypeParm->getDefaultArgumentInfo(),
Douglas Gregord684b002009-02-10 19:49:53 +00001323 true);
1324 PreviousDefaultArgLoc = OldTypeParm->getDefaultArgumentLoc();
1325 } else if (NewTypeParm->hasDefaultArgument()) {
1326 SawDefaultArgument = true;
1327 PreviousDefaultArgLoc = NewTypeParm->getDefaultArgumentLoc();
1328 } else if (SawDefaultArgument)
1329 MissingDefaultArg = true;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00001330 } else if (NonTypeTemplateParmDecl *NewNonTypeParm
Douglas Gregord684b002009-02-10 19:49:53 +00001331 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) {
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001332 // Check for unexpanded parameter packs.
Richard Smith6964b3f2012-09-07 02:06:42 +00001333 if (!NewNonTypeParm->isParameterPack() &&
1334 DiagnoseUnexpandedParameterPack(NewNonTypeParm->getLocation(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001335 NewNonTypeParm->getTypeSourceInfo(),
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001336 UPPC_NonTypeTemplateParameterType)) {
1337 Invalid = true;
1338 continue;
1339 }
1340
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001341 // Check the presence of a default argument here.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001342 if (NewNonTypeParm->hasDefaultArgument() &&
1343 DiagnoseDefaultTemplateArgument(*this, TPC,
1344 NewNonTypeParm->getLocation(),
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001345 NewNonTypeParm->getDefaultArgument()->getSourceRange())) {
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001346 NewNonTypeParm->removeDefaultArgument();
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001347 }
1348
Mike Stumpac5fc7c2009-08-04 21:02:39 +00001349 // Merge default arguments for non-type template parameters
Douglas Gregord684b002009-02-10 19:49:53 +00001350 NonTypeTemplateParmDecl *OldNonTypeParm
1351 = OldParams? cast<NonTypeTemplateParmDecl>(*OldParam) : 0;
Douglas Gregor1ed64762011-01-05 16:19:19 +00001352 if (NewNonTypeParm->isParameterPack()) {
1353 assert(!NewNonTypeParm->hasDefaultArgument() &&
1354 "Parameter packs can't have a default argument!");
Richard Smith6964b3f2012-09-07 02:06:42 +00001355 if (!NewNonTypeParm->isPackExpansion())
1356 SawParameterPack = true;
Douglas Gregor1ed64762011-01-05 16:19:19 +00001357 } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument() &&
Richard Smith03c55be2013-07-22 03:31:14 +00001358 NewNonTypeParm->hasDefaultArgument()) {
Douglas Gregord684b002009-02-10 19:49:53 +00001359 OldDefaultLoc = OldNonTypeParm->getDefaultArgumentLoc();
1360 NewDefaultLoc = NewNonTypeParm->getDefaultArgumentLoc();
1361 SawDefaultArgument = true;
1362 RedundantDefaultArg = true;
1363 PreviousDefaultArgLoc = NewDefaultLoc;
1364 } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument()) {
1365 // Merge the default argument from the old declaration to the
1366 // new declaration.
Douglas Gregord684b002009-02-10 19:49:53 +00001367 // FIXME: We need to create a new kind of "default argument"
Douglas Gregor61c4d282011-01-05 15:48:55 +00001368 // expression that points to a previous non-type template
Douglas Gregord684b002009-02-10 19:49:53 +00001369 // parameter.
1370 NewNonTypeParm->setDefaultArgument(
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001371 OldNonTypeParm->getDefaultArgument(),
1372 /*Inherited=*/ true);
Douglas Gregord684b002009-02-10 19:49:53 +00001373 PreviousDefaultArgLoc = OldNonTypeParm->getDefaultArgumentLoc();
1374 } else if (NewNonTypeParm->hasDefaultArgument()) {
1375 SawDefaultArgument = true;
1376 PreviousDefaultArgLoc = NewNonTypeParm->getDefaultArgumentLoc();
1377 } else if (SawDefaultArgument)
Mike Stump1eb44332009-09-09 15:08:12 +00001378 MissingDefaultArg = true;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00001379 } else {
Douglas Gregord684b002009-02-10 19:49:53 +00001380 TemplateTemplateParmDecl *NewTemplateParm
1381 = cast<TemplateTemplateParmDecl>(*NewParam);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001382
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001383 // Check for unexpanded parameter packs, recursively.
Douglas Gregor65019ac2011-10-25 03:44:56 +00001384 if (::DiagnoseUnexpandedParameterPacks(*this, NewTemplateParm)) {
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001385 Invalid = true;
1386 continue;
1387 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001388
David Blaikie1368e582011-10-19 05:19:50 +00001389 // Check the presence of a default argument here.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001390 if (NewTemplateParm->hasDefaultArgument() &&
1391 DiagnoseDefaultTemplateArgument(*this, TPC,
1392 NewTemplateParm->getLocation(),
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001393 NewTemplateParm->getDefaultArgument().getSourceRange()))
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001394 NewTemplateParm->removeDefaultArgument();
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001395
1396 // Merge default arguments for template template parameters
Douglas Gregord684b002009-02-10 19:49:53 +00001397 TemplateTemplateParmDecl *OldTemplateParm
1398 = OldParams? cast<TemplateTemplateParmDecl>(*OldParam) : 0;
Douglas Gregor1ed64762011-01-05 16:19:19 +00001399 if (NewTemplateParm->isParameterPack()) {
1400 assert(!NewTemplateParm->hasDefaultArgument() &&
1401 "Parameter packs can't have a default argument!");
Richard Smith6964b3f2012-09-07 02:06:42 +00001402 if (!NewTemplateParm->isPackExpansion())
1403 SawParameterPack = true;
Douglas Gregor1ed64762011-01-05 16:19:19 +00001404 } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument() &&
Douglas Gregord684b002009-02-10 19:49:53 +00001405 NewTemplateParm->hasDefaultArgument()) {
Douglas Gregor788cd062009-11-11 01:00:40 +00001406 OldDefaultLoc = OldTemplateParm->getDefaultArgument().getLocation();
1407 NewDefaultLoc = NewTemplateParm->getDefaultArgument().getLocation();
Douglas Gregord684b002009-02-10 19:49:53 +00001408 SawDefaultArgument = true;
1409 RedundantDefaultArg = true;
1410 PreviousDefaultArgLoc = NewDefaultLoc;
1411 } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument()) {
1412 // Merge the default argument from the old declaration to the
1413 // new declaration.
Mike Stump390b4cc2009-05-16 07:39:55 +00001414 // FIXME: We need to create a new kind of "default argument" expression
1415 // that points to a previous template template parameter.
Douglas Gregord684b002009-02-10 19:49:53 +00001416 NewTemplateParm->setDefaultArgument(
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001417 OldTemplateParm->getDefaultArgument(),
1418 /*Inherited=*/ true);
Douglas Gregor788cd062009-11-11 01:00:40 +00001419 PreviousDefaultArgLoc
1420 = OldTemplateParm->getDefaultArgument().getLocation();
Douglas Gregord684b002009-02-10 19:49:53 +00001421 } else if (NewTemplateParm->hasDefaultArgument()) {
1422 SawDefaultArgument = true;
Douglas Gregor788cd062009-11-11 01:00:40 +00001423 PreviousDefaultArgLoc
1424 = NewTemplateParm->getDefaultArgument().getLocation();
Douglas Gregord684b002009-02-10 19:49:53 +00001425 } else if (SawDefaultArgument)
Mike Stump1eb44332009-09-09 15:08:12 +00001426 MissingDefaultArg = true;
Douglas Gregord684b002009-02-10 19:49:53 +00001427 }
1428
Richard Smith6964b3f2012-09-07 02:06:42 +00001429 // C++11 [temp.param]p11:
David Blaikie1368e582011-10-19 05:19:50 +00001430 // If a template parameter of a primary class template or alias template
1431 // is a template parameter pack, it shall be the last template parameter.
Richard Smith6964b3f2012-09-07 02:06:42 +00001432 if (SawParameterPack && (NewParam + 1) != NewParamEnd &&
David Blaikie1368e582011-10-19 05:19:50 +00001433 (TPC == TPC_ClassTemplate || TPC == TPC_TypeAliasTemplate)) {
1434 Diag((*NewParam)->getLocation(),
1435 diag::err_template_param_pack_must_be_last_template_parameter);
1436 Invalid = true;
1437 }
1438
Douglas Gregord684b002009-02-10 19:49:53 +00001439 if (RedundantDefaultArg) {
1440 // C++ [temp.param]p12:
1441 // A template-parameter shall not be given default arguments
1442 // by two different declarations in the same scope.
1443 Diag(NewDefaultLoc, diag::err_template_param_default_arg_redefinition);
1444 Diag(OldDefaultLoc, diag::note_template_param_prev_default_arg);
1445 Invalid = true;
Douglas Gregoree5d21f2011-02-04 03:57:22 +00001446 } else if (MissingDefaultArg && TPC != TPC_FunctionTemplate) {
Douglas Gregord684b002009-02-10 19:49:53 +00001447 // C++ [temp.param]p11:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001448 // If a template-parameter of a class template has a default
1449 // template-argument, each subsequent template-parameter shall either
Douglas Gregorb49e4152011-01-05 16:21:17 +00001450 // have a default template-argument supplied or be a template parameter
1451 // pack.
Mike Stump1eb44332009-09-09 15:08:12 +00001452 Diag((*NewParam)->getLocation(),
Douglas Gregord684b002009-02-10 19:49:53 +00001453 diag::err_template_param_default_arg_missing);
1454 Diag(PreviousDefaultArgLoc, diag::note_template_param_prev_default_arg);
1455 Invalid = true;
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001456 RemoveDefaultArguments = true;
Douglas Gregord684b002009-02-10 19:49:53 +00001457 }
1458
1459 // If we have an old template parameter list that we're merging
1460 // in, move on to the next parameter.
1461 if (OldParams)
1462 ++OldParam;
1463 }
1464
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001465 // We were missing some default arguments at the end of the list, so remove
1466 // all of the default arguments.
1467 if (RemoveDefaultArguments) {
1468 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
1469 NewParamEnd = NewParams->end();
1470 NewParam != NewParamEnd; ++NewParam) {
1471 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*NewParam))
1472 TTP->removeDefaultArgument();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001473 else if (NonTypeTemplateParmDecl *NTTP
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001474 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam))
1475 NTTP->removeDefaultArgument();
1476 else
1477 cast<TemplateTemplateParmDecl>(*NewParam)->removeDefaultArgument();
1478 }
1479 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001480
Douglas Gregord684b002009-02-10 19:49:53 +00001481 return Invalid;
1482}
Douglas Gregorc15cb382009-02-09 23:23:08 +00001483
John McCall4e2cbb22010-10-20 05:44:58 +00001484namespace {
1485
1486/// A class which looks for a use of a certain level of template
1487/// parameter.
1488struct DependencyChecker : RecursiveASTVisitor<DependencyChecker> {
1489 typedef RecursiveASTVisitor<DependencyChecker> super;
1490
1491 unsigned Depth;
1492 bool Match;
1493
1494 DependencyChecker(TemplateParameterList *Params) : Match(false) {
1495 NamedDecl *ND = Params->getParam(0);
1496 if (TemplateTypeParmDecl *PD = dyn_cast<TemplateTypeParmDecl>(ND)) {
1497 Depth = PD->getDepth();
1498 } else if (NonTypeTemplateParmDecl *PD =
1499 dyn_cast<NonTypeTemplateParmDecl>(ND)) {
1500 Depth = PD->getDepth();
1501 } else {
1502 Depth = cast<TemplateTemplateParmDecl>(ND)->getDepth();
1503 }
1504 }
1505
1506 bool Matches(unsigned ParmDepth) {
1507 if (ParmDepth >= Depth) {
1508 Match = true;
1509 return true;
1510 }
1511 return false;
1512 }
1513
1514 bool VisitTemplateTypeParmType(const TemplateTypeParmType *T) {
1515 return !Matches(T->getDepth());
1516 }
1517
1518 bool TraverseTemplateName(TemplateName N) {
1519 if (TemplateTemplateParmDecl *PD =
1520 dyn_cast_or_null<TemplateTemplateParmDecl>(N.getAsTemplateDecl()))
1521 if (Matches(PD->getDepth())) return false;
1522 return super::TraverseTemplateName(N);
1523 }
1524
1525 bool VisitDeclRefExpr(DeclRefExpr *E) {
1526 if (NonTypeTemplateParmDecl *PD =
1527 dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) {
1528 if (PD->getDepth() == Depth) {
1529 Match = true;
1530 return false;
1531 }
1532 }
1533 return super::VisitDeclRefExpr(E);
1534 }
Douglas Gregor18c83392011-05-13 00:34:01 +00001535
1536 bool TraverseInjectedClassNameType(const InjectedClassNameType *T) {
1537 return TraverseType(T->getInjectedSpecializationType());
1538 }
John McCall4e2cbb22010-10-20 05:44:58 +00001539};
1540}
1541
Douglas Gregorc8406492011-05-10 18:27:06 +00001542/// Determines whether a given type depends on the given parameter
John McCall4e2cbb22010-10-20 05:44:58 +00001543/// list.
1544static bool
Douglas Gregorc8406492011-05-10 18:27:06 +00001545DependsOnTemplateParameters(QualType T, TemplateParameterList *Params) {
John McCall4e2cbb22010-10-20 05:44:58 +00001546 DependencyChecker Checker(Params);
Douglas Gregorc8406492011-05-10 18:27:06 +00001547 Checker.TraverseType(T);
John McCall4e2cbb22010-10-20 05:44:58 +00001548 return Checker.Match;
1549}
1550
Douglas Gregorc8406492011-05-10 18:27:06 +00001551// Find the source range corresponding to the named type in the given
1552// nested-name-specifier, if any.
1553static SourceRange getRangeOfTypeInNestedNameSpecifier(ASTContext &Context,
1554 QualType T,
1555 const CXXScopeSpec &SS) {
1556 NestedNameSpecifierLoc NNSLoc(SS.getScopeRep(), SS.location_data());
1557 while (NestedNameSpecifier *NNS = NNSLoc.getNestedNameSpecifier()) {
1558 if (const Type *CurType = NNS->getAsType()) {
1559 if (Context.hasSameUnqualifiedType(T, QualType(CurType, 0)))
1560 return NNSLoc.getTypeLoc().getSourceRange();
1561 } else
1562 break;
1563
1564 NNSLoc = NNSLoc.getPrefix();
1565 }
1566
1567 return SourceRange();
1568}
1569
Mike Stump1eb44332009-09-09 15:08:12 +00001570/// \brief Match the given template parameter lists to the given scope
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001571/// specifier, returning the template parameter list that applies to the
1572/// name.
1573///
1574/// \param DeclStartLoc the start of the declaration that has a scope
1575/// specifier or a template parameter list.
Mike Stump1eb44332009-09-09 15:08:12 +00001576///
Douglas Gregorc8406492011-05-10 18:27:06 +00001577/// \param DeclLoc The location of the declaration itself.
1578///
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001579/// \param SS the scope specifier that will be matched to the given template
1580/// parameter lists. This scope specifier precedes a qualified name that is
1581/// being declared.
1582///
1583/// \param ParamLists the template parameter lists, from the outermost to the
1584/// innermost template parameter lists.
1585///
John McCall77e8b112010-04-13 20:37:33 +00001586/// \param IsFriend Whether to apply the slightly different rules for
1587/// matching template parameters to scope specifiers in friend
1588/// declarations.
1589///
Douglas Gregor1fef4e62009-10-07 22:35:40 +00001590/// \param IsExplicitSpecialization will be set true if the entity being
1591/// declared is an explicit specialization, false otherwise.
1592///
Mike Stump1eb44332009-09-09 15:08:12 +00001593/// \returns the template parameter list, if any, that corresponds to the
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001594/// name that is preceded by the scope specifier @p SS. This template
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00001595/// parameter list may have template parameters (if we're declaring a
Mike Stump1eb44332009-09-09 15:08:12 +00001596/// template) or may have no template parameters (if we're declaring a
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00001597/// template specialization), or may be NULL (if what we're declaring isn't
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001598/// itself a template).
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001599TemplateParameterList *Sema::MatchTemplateParametersToScopeSpecifier(
1600 SourceLocation DeclStartLoc, SourceLocation DeclLoc, const CXXScopeSpec &SS,
1601 ArrayRef<TemplateParameterList *> ParamLists, bool IsFriend,
1602 bool &IsExplicitSpecialization, bool &Invalid) {
Douglas Gregor1fef4e62009-10-07 22:35:40 +00001603 IsExplicitSpecialization = false;
Douglas Gregorc8406492011-05-10 18:27:06 +00001604 Invalid = false;
1605
1606 // The sequence of nested types to which we will match up the template
1607 // parameter lists. We first build this list by starting with the type named
1608 // by the nested-name-specifier and walking out until we run out of types.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001609 SmallVector<QualType, 4> NestedTypes;
Douglas Gregorc8406492011-05-10 18:27:06 +00001610 QualType T;
Douglas Gregor714c9922011-05-15 17:27:27 +00001611 if (SS.getScopeRep()) {
1612 if (CXXRecordDecl *Record
1613 = dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, true)))
1614 T = Context.getTypeDeclType(Record);
1615 else
1616 T = QualType(SS.getScopeRep()->getAsType(), 0);
1617 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001618
1619 // If we found an explicit specialization that prevents us from needing
1620 // 'template<>' headers, this will be set to the location of that
1621 // explicit specialization.
1622 SourceLocation ExplicitSpecLoc;
1623
1624 while (!T.isNull()) {
1625 NestedTypes.push_back(T);
1626
1627 // Retrieve the parent of a record type.
1628 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
1629 // If this type is an explicit specialization, we're done.
1630 if (ClassTemplateSpecializationDecl *Spec
1631 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
1632 if (!isa<ClassTemplatePartialSpecializationDecl>(Spec) &&
1633 Spec->getSpecializationKind() == TSK_ExplicitSpecialization) {
1634 ExplicitSpecLoc = Spec->getLocation();
1635 break;
Douglas Gregor3ebd7532009-11-23 12:11:45 +00001636 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001637 } else if (Record->getTemplateSpecializationKind()
1638 == TSK_ExplicitSpecialization) {
1639 ExplicitSpecLoc = Record->getLocation();
John McCall77e8b112010-04-13 20:37:33 +00001640 break;
1641 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001642
1643 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Record->getParent()))
1644 T = Context.getTypeDeclType(Parent);
1645 else
1646 T = QualType();
1647 continue;
1648 }
1649
1650 if (const TemplateSpecializationType *TST
1651 = T->getAs<TemplateSpecializationType>()) {
1652 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
1653 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Template->getDeclContext()))
1654 T = Context.getTypeDeclType(Parent);
1655 else
1656 T = QualType();
1657 continue;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001658 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001659 }
1660
1661 // Look one step prior in a dependent template specialization type.
1662 if (const DependentTemplateSpecializationType *DependentTST
1663 = T->getAs<DependentTemplateSpecializationType>()) {
1664 if (NestedNameSpecifier *NNS = DependentTST->getQualifier())
1665 T = QualType(NNS->getAsType(), 0);
1666 else
1667 T = QualType();
1668 continue;
1669 }
1670
1671 // Look one step prior in a dependent name type.
1672 if (const DependentNameType *DependentName = T->getAs<DependentNameType>()){
1673 if (NestedNameSpecifier *NNS = DependentName->getQualifier())
1674 T = QualType(NNS->getAsType(), 0);
1675 else
1676 T = QualType();
1677 continue;
1678 }
1679
1680 // Retrieve the parent of an enumeration type.
1681 if (const EnumType *EnumT = T->getAs<EnumType>()) {
1682 // FIXME: Forward-declared enums require a TSK_ExplicitSpecialization
1683 // check here.
1684 EnumDecl *Enum = EnumT->getDecl();
1685
1686 // Get to the parent type.
1687 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Enum->getParent()))
1688 T = Context.getTypeDeclType(Parent);
1689 else
1690 T = QualType();
1691 continue;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001692 }
Mike Stump1eb44332009-09-09 15:08:12 +00001693
Douglas Gregorc8406492011-05-10 18:27:06 +00001694 T = QualType();
1695 }
1696 // Reverse the nested types list, since we want to traverse from the outermost
1697 // to the innermost while checking template-parameter-lists.
1698 std::reverse(NestedTypes.begin(), NestedTypes.end());
Douglas Gregorb88e8882009-07-30 17:40:51 +00001699
Douglas Gregorc8406492011-05-10 18:27:06 +00001700 // C++0x [temp.expl.spec]p17:
1701 // A member or a member template may be nested within many
1702 // enclosing class templates. In an explicit specialization for
1703 // such a member, the member declaration shall be preceded by a
1704 // template<> for each enclosing class template that is
1705 // explicitly specialized.
Douglas Gregor89b9f102011-06-06 15:22:55 +00001706 bool SawNonEmptyTemplateParameterList = false;
Douglas Gregorc8406492011-05-10 18:27:06 +00001707 unsigned ParamIdx = 0;
1708 for (unsigned TypeIdx = 0, NumTypes = NestedTypes.size(); TypeIdx != NumTypes;
1709 ++TypeIdx) {
1710 T = NestedTypes[TypeIdx];
1711
1712 // Whether we expect a 'template<>' header.
1713 bool NeedEmptyTemplateHeader = false;
1714
1715 // Whether we expect a template header with parameters.
1716 bool NeedNonemptyTemplateHeader = false;
1717
1718 // For a dependent type, the set of template parameters that we
1719 // expect to see.
1720 TemplateParameterList *ExpectedTemplateParams = 0;
1721
Douglas Gregor175c5bb2011-05-11 23:26:17 +00001722 // C++0x [temp.expl.spec]p15:
1723 // A member or a member template may be nested within many enclosing
1724 // class templates. In an explicit specialization for such a member, the
1725 // member declaration shall be preceded by a template<> for each
1726 // enclosing class template that is explicitly specialized.
Douglas Gregorc8406492011-05-10 18:27:06 +00001727 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
1728 if (ClassTemplatePartialSpecializationDecl *Partial
1729 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) {
1730 ExpectedTemplateParams = Partial->getTemplateParameters();
1731 NeedNonemptyTemplateHeader = true;
1732 } else if (Record->isDependentType()) {
1733 if (Record->getDescribedClassTemplate()) {
John McCall31f17ec2010-04-27 00:57:59 +00001734 ExpectedTemplateParams = Record->getDescribedClassTemplate()
Douglas Gregorc8406492011-05-10 18:27:06 +00001735 ->getTemplateParameters();
1736 NeedNonemptyTemplateHeader = true;
1737 }
1738 } else if (ClassTemplateSpecializationDecl *Spec
1739 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
1740 // C++0x [temp.expl.spec]p4:
1741 // Members of an explicitly specialized class template are defined
1742 // in the same manner as members of normal classes, and not using
1743 // the template<> syntax.
1744 if (Spec->getSpecializationKind() != TSK_ExplicitSpecialization)
1745 NeedEmptyTemplateHeader = true;
1746 else
Douglas Gregor95ea4502011-06-01 22:37:07 +00001747 continue;
Douglas Gregorc8406492011-05-10 18:27:06 +00001748 } else if (Record->getTemplateSpecializationKind()) {
1749 if (Record->getTemplateSpecializationKind()
Douglas Gregor175c5bb2011-05-11 23:26:17 +00001750 != TSK_ExplicitSpecialization &&
1751 TypeIdx == NumTypes - 1)
1752 IsExplicitSpecialization = true;
1753
1754 continue;
Douglas Gregorc8406492011-05-10 18:27:06 +00001755 }
1756 } else if (const TemplateSpecializationType *TST
1757 = T->getAs<TemplateSpecializationType>()) {
1758 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
1759 ExpectedTemplateParams = Template->getTemplateParameters();
1760 NeedNonemptyTemplateHeader = true;
1761 }
1762 } else if (T->getAs<DependentTemplateSpecializationType>()) {
1763 // FIXME: We actually could/should check the template arguments here
1764 // against the corresponding template parameter list.
1765 NeedNonemptyTemplateHeader = false;
1766 }
1767
Douglas Gregor89b9f102011-06-06 15:22:55 +00001768 // C++ [temp.expl.spec]p16:
1769 // In an explicit specialization declaration for a member of a class
1770 // template or a member template that ap- pears in namespace scope, the
1771 // member template and some of its enclosing class templates may remain
1772 // unspecialized, except that the declaration shall not explicitly
1773 // specialize a class member template if its en- closing class templates
1774 // are not explicitly specialized as well.
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001775 if (ParamIdx < ParamLists.size()) {
Douglas Gregor89b9f102011-06-06 15:22:55 +00001776 if (ParamLists[ParamIdx]->size() == 0) {
1777 if (SawNonEmptyTemplateParameterList) {
1778 Diag(DeclLoc, diag::err_specialize_member_of_template)
1779 << ParamLists[ParamIdx]->getSourceRange();
1780 Invalid = true;
1781 IsExplicitSpecialization = false;
1782 return 0;
1783 }
1784 } else
1785 SawNonEmptyTemplateParameterList = true;
1786 }
1787
Douglas Gregorc8406492011-05-10 18:27:06 +00001788 if (NeedEmptyTemplateHeader) {
1789 // If we're on the last of the types, and we need a 'template<>' header
1790 // here, then it's an explicit specialization.
1791 if (TypeIdx == NumTypes - 1)
1792 IsExplicitSpecialization = true;
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001793
1794 if (ParamIdx < ParamLists.size()) {
Douglas Gregorc8406492011-05-10 18:27:06 +00001795 if (ParamLists[ParamIdx]->size() > 0) {
1796 // The header has template parameters when it shouldn't. Complain.
1797 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
1798 diag::err_template_param_list_matches_nontemplate)
1799 << T
1800 << SourceRange(ParamLists[ParamIdx]->getLAngleLoc(),
1801 ParamLists[ParamIdx]->getRAngleLoc())
1802 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
1803 Invalid = true;
1804 return 0;
1805 }
1806
1807 // Consume this template header.
1808 ++ParamIdx;
1809 continue;
1810 }
1811
1812 if (!IsFriend) {
1813 // We don't have a template header, but we should.
1814 SourceLocation ExpectedTemplateLoc;
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001815 if (!ParamLists.empty())
Douglas Gregorc8406492011-05-10 18:27:06 +00001816 ExpectedTemplateLoc = ParamLists[0]->getTemplateLoc();
1817 else
1818 ExpectedTemplateLoc = DeclStartLoc;
1819
1820 Diag(DeclLoc, diag::err_template_spec_needs_header)
1821 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS)
1822 << FixItHint::CreateInsertion(ExpectedTemplateLoc, "template<> ");
1823 }
1824
1825 continue;
1826 }
1827
1828 if (NeedNonemptyTemplateHeader) {
1829 // In friend declarations we can have template-ids which don't
1830 // depend on the corresponding template parameter lists. But
1831 // assume that empty parameter lists are supposed to match this
1832 // template-id.
1833 if (IsFriend && T->isDependentType()) {
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001834 if (ParamIdx < ParamLists.size() &&
Douglas Gregorc8406492011-05-10 18:27:06 +00001835 DependsOnTemplateParameters(T, ParamLists[ParamIdx]))
1836 ExpectedTemplateParams = 0;
1837 else
1838 continue;
Mike Stump1eb44332009-09-09 15:08:12 +00001839 }
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001840
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001841 if (ParamIdx < ParamLists.size()) {
1842 // Check the template parameter list, if we can.
Douglas Gregorc8406492011-05-10 18:27:06 +00001843 if (ExpectedTemplateParams &&
1844 !TemplateParameterListsAreEqual(ParamLists[ParamIdx],
1845 ExpectedTemplateParams,
1846 true, TPL_TemplateMatch))
1847 Invalid = true;
1848
1849 if (!Invalid &&
1850 CheckTemplateParameterList(ParamLists[ParamIdx], 0,
1851 TPC_ClassTemplateMember))
1852 Invalid = true;
1853
1854 ++ParamIdx;
1855 continue;
1856 }
1857
1858 Diag(DeclLoc, diag::err_template_spec_needs_template_parameters)
1859 << T
1860 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
1861 Invalid = true;
1862 continue;
1863 }
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001864 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001865
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001866 // If there were at least as many template-ids as there were template
1867 // parameter lists, then there are no template parameter lists remaining for
1868 // the declaration itself.
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001869 if (ParamIdx >= ParamLists.size())
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001870 return 0;
Mike Stump1eb44332009-09-09 15:08:12 +00001871
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001872 // If there were too many template parameter lists, complain about that now.
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001873 if (ParamIdx < ParamLists.size() - 1) {
Douglas Gregorc8406492011-05-10 18:27:06 +00001874 bool HasAnyExplicitSpecHeader = false;
1875 bool AllExplicitSpecHeaders = true;
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001876 for (unsigned I = ParamIdx, E = ParamLists.size() - 1; I != E; ++I) {
Douglas Gregorc8406492011-05-10 18:27:06 +00001877 if (ParamLists[I]->size() == 0)
1878 HasAnyExplicitSpecHeader = true;
1879 else
1880 AllExplicitSpecHeaders = false;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001881 }
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001882
Douglas Gregorc8406492011-05-10 18:27:06 +00001883 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001884 AllExplicitSpecHeaders ? diag::warn_template_spec_extra_headers
1885 : diag::err_template_spec_extra_headers)
1886 << SourceRange(ParamLists[ParamIdx]->getTemplateLoc(),
1887 ParamLists[ParamLists.size() - 2]->getRAngleLoc());
Douglas Gregorc8406492011-05-10 18:27:06 +00001888
1889 // If there was a specialization somewhere, such that 'template<>' is
1890 // not required, and there were any 'template<>' headers, note where the
1891 // specialization occurred.
1892 if (ExplicitSpecLoc.isValid() && HasAnyExplicitSpecHeader)
1893 Diag(ExplicitSpecLoc,
1894 diag::note_explicit_template_spec_does_not_need_header)
1895 << NestedTypes.back();
1896
1897 // We have a template parameter list with no corresponding scope, which
1898 // means that the resulting template declaration can't be instantiated
1899 // properly (we'll end up with dependent nodes when we shouldn't).
1900 if (!AllExplicitSpecHeaders)
1901 Invalid = true;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001902 }
Mike Stump1eb44332009-09-09 15:08:12 +00001903
Douglas Gregor89b9f102011-06-06 15:22:55 +00001904 // C++ [temp.expl.spec]p16:
1905 // In an explicit specialization declaration for a member of a class
1906 // template or a member template that ap- pears in namespace scope, the
1907 // member template and some of its enclosing class templates may remain
1908 // unspecialized, except that the declaration shall not explicitly
1909 // specialize a class member template if its en- closing class templates
1910 // are not explicitly specialized as well.
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001911 if (ParamLists.back()->size() == 0 && SawNonEmptyTemplateParameterList) {
Douglas Gregor89b9f102011-06-06 15:22:55 +00001912 Diag(DeclLoc, diag::err_specialize_member_of_template)
1913 << ParamLists[ParamIdx]->getSourceRange();
1914 Invalid = true;
1915 IsExplicitSpecialization = false;
1916 return 0;
1917 }
1918
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001919 // Return the last template parameter list, which corresponds to the
1920 // entity being declared.
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00001921 return ParamLists.back();
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001922}
1923
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001924void Sema::NoteAllFoundTemplates(TemplateName Name) {
1925 if (TemplateDecl *Template = Name.getAsTemplateDecl()) {
1926 Diag(Template->getLocation(), diag::note_template_declared_here)
1927 << (isa<FunctionTemplateDecl>(Template)? 0
1928 : isa<ClassTemplateDecl>(Template)? 1
Richard Smith3e4c6c42011-05-05 21:57:07 +00001929 : isa<TypeAliasTemplateDecl>(Template)? 2
1930 : 3)
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001931 << Template->getDeclName();
1932 return;
1933 }
1934
1935 if (OverloadedTemplateStorage *OST = Name.getAsOverloadedTemplate()) {
1936 for (OverloadedTemplateStorage::iterator I = OST->begin(),
1937 IEnd = OST->end();
1938 I != IEnd; ++I)
1939 Diag((*I)->getLocation(), diag::note_template_declared_here)
1940 << 0 << (*I)->getDeclName();
1941
1942 return;
1943 }
1944}
1945
Douglas Gregor7532dc62009-03-30 22:58:21 +00001946QualType Sema::CheckTemplateIdType(TemplateName Name,
1947 SourceLocation TemplateLoc,
Douglas Gregor67714232011-03-03 02:41:12 +00001948 TemplateArgumentListInfo &TemplateArgs) {
John McCall14606042011-06-30 08:33:18 +00001949 DependentTemplateName *DTN
1950 = Name.getUnderlying().getAsDependentTemplateName();
Richard Smith3e4c6c42011-05-05 21:57:07 +00001951 if (DTN && DTN->isIdentifier())
1952 // When building a template-id where the template-name is dependent,
1953 // assume the template is a type template. Either our assumption is
1954 // correct, or the code is ill-formed and will be diagnosed when the
1955 // dependent name is substituted.
1956 return Context.getDependentTemplateSpecializationType(ETK_None,
1957 DTN->getQualifier(),
1958 DTN->getIdentifier(),
1959 TemplateArgs);
1960
Douglas Gregor7532dc62009-03-30 22:58:21 +00001961 TemplateDecl *Template = Name.getAsTemplateDecl();
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001962 if (!Template || isa<FunctionTemplateDecl>(Template)) {
1963 // We might have a substituted template template parameter pack. If so,
1964 // build a template specialization type for it.
1965 if (Name.getAsSubstTemplateTemplateParmPack())
1966 return Context.getTemplateSpecializationType(Name, TemplateArgs);
Richard Smith3e4c6c42011-05-05 21:57:07 +00001967
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001968 Diag(TemplateLoc, diag::err_template_id_not_a_type)
1969 << Name;
1970 NoteAllFoundTemplates(Name);
1971 return QualType();
Douglas Gregorc45c2322009-03-31 00:43:58 +00001972 }
Douglas Gregor7532dc62009-03-30 22:58:21 +00001973
Douglas Gregor40808ce2009-03-09 23:48:35 +00001974 // Check that the template argument list is well-formed for this
1975 // template.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001976 SmallVector<TemplateArgument, 4> Converted;
Douglas Gregorb70126a2012-02-03 17:16:23 +00001977 bool ExpansionIntoFixedList = false;
John McCalld5532b62009-11-23 01:53:49 +00001978 if (CheckTemplateArgumentList(Template, TemplateLoc, TemplateArgs,
Douglas Gregorb70126a2012-02-03 17:16:23 +00001979 false, Converted, &ExpansionIntoFixedList))
Douglas Gregor40808ce2009-03-09 23:48:35 +00001980 return QualType();
1981
Douglas Gregor40808ce2009-03-09 23:48:35 +00001982 QualType CanonType;
1983
Douglas Gregor561f8122011-07-01 01:22:09 +00001984 bool InstantiationDependent = false;
Douglas Gregorb70126a2012-02-03 17:16:23 +00001985 TypeAliasTemplateDecl *AliasTemplate = 0;
1986 if (!ExpansionIntoFixedList &&
1987 (AliasTemplate = dyn_cast<TypeAliasTemplateDecl>(Template))) {
Richard Smith3e4c6c42011-05-05 21:57:07 +00001988 // Find the canonical type for this type alias template specialization.
1989 TypeAliasDecl *Pattern = AliasTemplate->getTemplatedDecl();
1990 if (Pattern->isInvalidDecl())
1991 return QualType();
1992
1993 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
1994 Converted.data(), Converted.size());
1995
1996 // Only substitute for the innermost template argument list.
1997 MultiLevelTemplateArgumentList TemplateArgLists;
Richard Smith18041742011-05-14 15:04:18 +00001998 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
Richard Smithaff37b42011-05-12 00:06:17 +00001999 unsigned Depth = AliasTemplate->getTemplateParameters()->getDepth();
2000 for (unsigned I = 0; I < Depth; ++I)
Richard Smith7a9f7c72013-05-17 03:04:50 +00002001 TemplateArgLists.addOuterTemplateArguments(None);
Richard Smith3e4c6c42011-05-05 21:57:07 +00002002
Richard Smitha8eaf002012-08-23 06:16:52 +00002003 LocalInstantiationScope Scope(*this);
Richard Smith3e4c6c42011-05-05 21:57:07 +00002004 InstantiatingTemplate Inst(*this, TemplateLoc, Template);
Richard Smithab91ef12012-07-08 02:38:24 +00002005 if (Inst)
2006 return QualType();
Richard Smitha8eaf002012-08-23 06:16:52 +00002007
Richard Smith3e4c6c42011-05-05 21:57:07 +00002008 CanonType = SubstType(Pattern->getUnderlyingType(),
2009 TemplateArgLists, AliasTemplate->getLocation(),
2010 AliasTemplate->getDeclName());
2011 if (CanonType.isNull())
2012 return QualType();
2013 } else if (Name.isDependent() ||
2014 TemplateSpecializationType::anyDependentTemplateArguments(
Douglas Gregor561f8122011-07-01 01:22:09 +00002015 TemplateArgs, InstantiationDependent)) {
Douglas Gregor40808ce2009-03-09 23:48:35 +00002016 // This class template specialization is a dependent
2017 // type. Therefore, its canonical type is another class template
2018 // specialization type that contains all of the converted
2019 // arguments in canonical form. This ensures that, e.g., A<T> and
2020 // A<T, T> have identical types when A is declared as:
2021 //
2022 // template<typename T, typename U = T> struct A;
Douglas Gregor25a3ef72009-05-07 06:41:52 +00002023 TemplateName CanonName = Context.getCanonicalTemplateName(Name);
Mike Stump1eb44332009-09-09 15:08:12 +00002024 CanonType = Context.getTemplateSpecializationType(CanonName,
Douglas Gregor910f8002010-11-07 23:05:16 +00002025 Converted.data(),
2026 Converted.size());
Mike Stump1eb44332009-09-09 15:08:12 +00002027
Douglas Gregor1275ae02009-07-28 23:00:59 +00002028 // FIXME: CanonType is not actually the canonical type, and unfortunately
John McCall833ca992009-10-29 08:12:44 +00002029 // it is a TemplateSpecializationType that we will never use again.
Douglas Gregor1275ae02009-07-28 23:00:59 +00002030 // In the future, we need to teach getTemplateSpecializationType to only
2031 // build the canonical type and return that to us.
2032 CanonType = Context.getCanonicalType(CanonType);
John McCall31f17ec2010-04-27 00:57:59 +00002033
2034 // This might work out to be a current instantiation, in which
2035 // case the canonical type needs to be the InjectedClassNameType.
2036 //
2037 // TODO: in theory this could be a simple hashtable lookup; most
2038 // changes to CurContext don't change the set of current
2039 // instantiations.
2040 if (isa<ClassTemplateDecl>(Template)) {
2041 for (DeclContext *Ctx = CurContext; Ctx; Ctx = Ctx->getLookupParent()) {
2042 // If we get out to a namespace, we're done.
2043 if (Ctx->isFileContext()) break;
2044
2045 // If this isn't a record, keep looking.
2046 CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx);
2047 if (!Record) continue;
2048
2049 // Look for one of the two cases with InjectedClassNameTypes
2050 // and check whether it's the same template.
2051 if (!isa<ClassTemplatePartialSpecializationDecl>(Record) &&
2052 !Record->getDescribedClassTemplate())
2053 continue;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002054
John McCall31f17ec2010-04-27 00:57:59 +00002055 // Fetch the injected class name type and check whether its
2056 // injected type is equal to the type we just built.
2057 QualType ICNT = Context.getTypeDeclType(Record);
2058 QualType Injected = cast<InjectedClassNameType>(ICNT)
2059 ->getInjectedSpecializationType();
2060
2061 if (CanonType != Injected->getCanonicalTypeInternal())
2062 continue;
2063
2064 // If so, the canonical type of this TST is the injected
2065 // class name type of the record we just found.
2066 assert(ICNT.isCanonical());
2067 CanonType = ICNT;
John McCall31f17ec2010-04-27 00:57:59 +00002068 break;
2069 }
2070 }
Mike Stump1eb44332009-09-09 15:08:12 +00002071 } else if (ClassTemplateDecl *ClassTemplate
Douglas Gregor7532dc62009-03-30 22:58:21 +00002072 = dyn_cast<ClassTemplateDecl>(Template)) {
Douglas Gregor40808ce2009-03-09 23:48:35 +00002073 // Find the class template specialization declaration that
2074 // corresponds to these arguments.
Douglas Gregor40808ce2009-03-09 23:48:35 +00002075 void *InsertPos = 0;
2076 ClassTemplateSpecializationDecl *Decl
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002077 = ClassTemplate->findSpecialization(Converted.data(), Converted.size(),
Douglas Gregor910f8002010-11-07 23:05:16 +00002078 InsertPos);
Douglas Gregor40808ce2009-03-09 23:48:35 +00002079 if (!Decl) {
2080 // This is the first time we have referenced this class template
2081 // specialization. Create the canonical declaration and add it to
2082 // the set of specializations.
Mike Stump1eb44332009-09-09 15:08:12 +00002083 Decl = ClassTemplateSpecializationDecl::Create(Context,
Douglas Gregor13c85772010-05-06 00:28:52 +00002084 ClassTemplate->getTemplatedDecl()->getTagKind(),
2085 ClassTemplate->getDeclContext(),
Abramo Bagnara09d82122011-10-03 20:34:03 +00002086 ClassTemplate->getTemplatedDecl()->getLocStart(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00002087 ClassTemplate->getLocation(),
Douglas Gregor910f8002010-11-07 23:05:16 +00002088 ClassTemplate,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002089 Converted.data(),
Douglas Gregor910f8002010-11-07 23:05:16 +00002090 Converted.size(), 0);
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00002091 ClassTemplate->AddSpecialization(Decl, InsertPos);
Abramo Bagnara4f216d382012-09-05 09:05:18 +00002092 if (ClassTemplate->isOutOfLine())
2093 Decl->setLexicalDeclContext(ClassTemplate->getLexicalDeclContext());
Douglas Gregor40808ce2009-03-09 23:48:35 +00002094 }
2095
2096 CanonType = Context.getTypeDeclType(Decl);
John McCall3cb0ebd2010-03-10 03:28:59 +00002097 assert(isa<RecordType>(CanonType) &&
2098 "type of non-dependent specialization is not a RecordType");
Douglas Gregor40808ce2009-03-09 23:48:35 +00002099 }
Mike Stump1eb44332009-09-09 15:08:12 +00002100
Douglas Gregor40808ce2009-03-09 23:48:35 +00002101 // Build the fully-sugared type for this class template
2102 // specialization, which refers back to the class template
2103 // specialization we created or found.
John McCall71d74bc2010-06-13 09:25:03 +00002104 return Context.getTemplateSpecializationType(Name, TemplateArgs, CanonType);
Douglas Gregor40808ce2009-03-09 23:48:35 +00002105}
2106
John McCallf312b1e2010-08-26 23:41:50 +00002107TypeResult
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002108Sema::ActOnTemplateIdType(CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
Douglas Gregor059101f2011-03-02 00:47:37 +00002109 TemplateTy TemplateD, SourceLocation TemplateLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00002110 SourceLocation LAngleLoc,
Douglas Gregor7532dc62009-03-30 22:58:21 +00002111 ASTTemplateArgsPtr TemplateArgsIn,
Abramo Bagnarafad03b72012-01-27 08:46:19 +00002112 SourceLocation RAngleLoc,
2113 bool IsCtorOrDtorName) {
Douglas Gregor059101f2011-03-02 00:47:37 +00002114 if (SS.isInvalid())
2115 return true;
2116
Douglas Gregor7532dc62009-03-30 22:58:21 +00002117 TemplateName Template = TemplateD.getAsVal<TemplateName>();
Douglas Gregor55f6b142009-02-09 18:46:07 +00002118
Douglas Gregor40808ce2009-03-09 23:48:35 +00002119 // Translate the parser's template argument list in our AST format.
John McCalld5532b62009-11-23 01:53:49 +00002120 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
Douglas Gregor314b97f2009-11-10 19:49:08 +00002121 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
Douglas Gregorc15cb382009-02-09 23:23:08 +00002122
Douglas Gregora88f09f2011-02-28 17:23:35 +00002123 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
Abramo Bagnarafad03b72012-01-27 08:46:19 +00002124 QualType T
2125 = Context.getDependentTemplateSpecializationType(ETK_None,
2126 DTN->getQualifier(),
2127 DTN->getIdentifier(),
2128 TemplateArgs);
2129 // Build type-source information.
Douglas Gregora88f09f2011-02-28 17:23:35 +00002130 TypeLocBuilder TLB;
2131 DependentTemplateSpecializationTypeLoc SpecTL
2132 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002133 SpecTL.setElaboratedKeywordLoc(SourceLocation());
2134 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
Abramo Bagnara66581d42012-02-06 22:45:07 +00002135 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002136 SpecTL.setTemplateNameLoc(TemplateLoc);
Douglas Gregora88f09f2011-02-28 17:23:35 +00002137 SpecTL.setLAngleLoc(LAngleLoc);
2138 SpecTL.setRAngleLoc(RAngleLoc);
Douglas Gregora88f09f2011-02-28 17:23:35 +00002139 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
2140 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
2141 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
2142 }
2143
John McCalld5532b62009-11-23 01:53:49 +00002144 QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs);
Douglas Gregor31a19b62009-04-01 21:51:26 +00002145
2146 if (Result.isNull())
2147 return true;
2148
Douglas Gregor059101f2011-03-02 00:47:37 +00002149 // Build type-source information.
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002150 TypeLocBuilder TLB;
Douglas Gregor059101f2011-03-02 00:47:37 +00002151 TemplateSpecializationTypeLoc SpecTL
2152 = TLB.push<TemplateSpecializationTypeLoc>(Result);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002153 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00002154 SpecTL.setTemplateNameLoc(TemplateLoc);
2155 SpecTL.setLAngleLoc(LAngleLoc);
2156 SpecTL.setRAngleLoc(RAngleLoc);
2157 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
2158 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
John McCall833ca992009-10-29 08:12:44 +00002159
Abramo Bagnarafad03b72012-01-27 08:46:19 +00002160 // NOTE: avoid constructing an ElaboratedTypeLoc if this is a
2161 // constructor or destructor name (in such a case, the scope specifier
2162 // will be attached to the enclosing Decl or Expr node).
2163 if (SS.isNotEmpty() && !IsCtorOrDtorName) {
Douglas Gregor059101f2011-03-02 00:47:37 +00002164 // Create an elaborated-type-specifier containing the nested-name-specifier.
2165 Result = Context.getElaboratedType(ETK_None, SS.getScopeRep(), Result);
2166 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
Abramo Bagnara38a42912012-02-06 19:09:27 +00002167 ElabTL.setElaboratedKeywordLoc(SourceLocation());
Douglas Gregor059101f2011-03-02 00:47:37 +00002168 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
2169 }
2170
2171 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
John McCall6b2becf2009-09-08 17:47:29 +00002172}
John McCallf1bbbb42009-09-04 01:14:41 +00002173
Douglas Gregor059101f2011-03-02 00:47:37 +00002174TypeResult Sema::ActOnTagTemplateIdType(TagUseKind TUK,
John McCallf312b1e2010-08-26 23:41:50 +00002175 TypeSpecifierType TagSpec,
Douglas Gregor059101f2011-03-02 00:47:37 +00002176 SourceLocation TagLoc,
2177 CXXScopeSpec &SS,
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002178 SourceLocation TemplateKWLoc,
2179 TemplateTy TemplateD,
Douglas Gregor059101f2011-03-02 00:47:37 +00002180 SourceLocation TemplateLoc,
2181 SourceLocation LAngleLoc,
2182 ASTTemplateArgsPtr TemplateArgsIn,
2183 SourceLocation RAngleLoc) {
2184 TemplateName Template = TemplateD.getAsVal<TemplateName>();
2185
2186 // Translate the parser's template argument list in our AST format.
2187 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
2188 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
2189
2190 // Determine the tag kind
Abramo Bagnara465d41b2010-05-11 21:36:43 +00002191 TagTypeKind TagKind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
Douglas Gregor059101f2011-03-02 00:47:37 +00002192 ElaboratedTypeKeyword Keyword
2193 = TypeWithKeyword::getKeywordForTagTypeKind(TagKind);
Mike Stump1eb44332009-09-09 15:08:12 +00002194
Douglas Gregor059101f2011-03-02 00:47:37 +00002195 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
2196 QualType T = Context.getDependentTemplateSpecializationType(Keyword,
2197 DTN->getQualifier(),
2198 DTN->getIdentifier(),
2199 TemplateArgs);
2200
2201 // Build type-source information.
2202 TypeLocBuilder TLB;
2203 DependentTemplateSpecializationTypeLoc SpecTL
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002204 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
2205 SpecTL.setElaboratedKeywordLoc(TagLoc);
2206 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
Abramo Bagnara66581d42012-02-06 22:45:07 +00002207 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002208 SpecTL.setTemplateNameLoc(TemplateLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00002209 SpecTL.setLAngleLoc(LAngleLoc);
2210 SpecTL.setRAngleLoc(RAngleLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00002211 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
2212 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
2213 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
2214 }
Richard Smith3e4c6c42011-05-05 21:57:07 +00002215
2216 if (TypeAliasTemplateDecl *TAT =
2217 dyn_cast_or_null<TypeAliasTemplateDecl>(Template.getAsTemplateDecl())) {
2218 // C++0x [dcl.type.elab]p2:
2219 // If the identifier resolves to a typedef-name or the simple-template-id
2220 // resolves to an alias template specialization, the
2221 // elaborated-type-specifier is ill-formed.
2222 Diag(TemplateLoc, diag::err_tag_reference_non_tag) << 4;
2223 Diag(TAT->getLocation(), diag::note_declared_at);
2224 }
Douglas Gregor059101f2011-03-02 00:47:37 +00002225
2226 QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs);
2227 if (Result.isNull())
Matt Beaumont-Gay3a51d412011-08-25 23:22:24 +00002228 return TypeResult(true);
Douglas Gregor059101f2011-03-02 00:47:37 +00002229
2230 // Check the tag kind
2231 if (const RecordType *RT = Result->getAs<RecordType>()) {
John McCall6b2becf2009-09-08 17:47:29 +00002232 RecordDecl *D = RT->getDecl();
Douglas Gregor059101f2011-03-02 00:47:37 +00002233
John McCall6b2becf2009-09-08 17:47:29 +00002234 IdentifierInfo *Id = D->getIdentifier();
2235 assert(Id && "templated class must have an identifier");
Douglas Gregor059101f2011-03-02 00:47:37 +00002236
Richard Trieubbf34c02011-06-10 03:11:26 +00002237 if (!isAcceptableTagRedeclaration(D, TagKind, TUK == TUK_Definition,
2238 TagLoc, *Id)) {
John McCall6b2becf2009-09-08 17:47:29 +00002239 Diag(TagLoc, diag::err_use_with_wrong_tag)
Douglas Gregor059101f2011-03-02 00:47:37 +00002240 << Result
Douglas Gregor849b2432010-03-31 17:46:05 +00002241 << FixItHint::CreateReplacement(SourceRange(TagLoc), D->getKindName());
John McCallc4e70192009-09-11 04:59:25 +00002242 Diag(D->getLocation(), diag::note_previous_use);
John McCallf1bbbb42009-09-04 01:14:41 +00002243 }
2244 }
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002245
Douglas Gregor059101f2011-03-02 00:47:37 +00002246 // Provide source-location information for the template specialization.
2247 TypeLocBuilder TLB;
2248 TemplateSpecializationTypeLoc SpecTL
2249 = TLB.push<TemplateSpecializationTypeLoc>(Result);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002250 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00002251 SpecTL.setTemplateNameLoc(TemplateLoc);
2252 SpecTL.setLAngleLoc(LAngleLoc);
2253 SpecTL.setRAngleLoc(RAngleLoc);
2254 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
2255 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
John McCallf1bbbb42009-09-04 01:14:41 +00002256
Douglas Gregor059101f2011-03-02 00:47:37 +00002257 // Construct an elaborated type containing the nested-name-specifier (if any)
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002258 // and tag keyword.
Douglas Gregor059101f2011-03-02 00:47:37 +00002259 Result = Context.getElaboratedType(Keyword, SS.getScopeRep(), Result);
2260 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
Abramo Bagnara38a42912012-02-06 19:09:27 +00002261 ElabTL.setElaboratedKeywordLoc(TagLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00002262 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
2263 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
Douglas Gregor55f6b142009-02-09 18:46:07 +00002264}
2265
John McCall60d7b3a2010-08-24 06:29:42 +00002266ExprResult Sema::BuildTemplateIdExpr(const CXXScopeSpec &SS,
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002267 SourceLocation TemplateKWLoc,
Douglas Gregor4c9be892011-02-28 20:01:57 +00002268 LookupResult &R,
2269 bool RequiresADL,
Abramo Bagnara9d9922a2012-02-06 14:31:00 +00002270 const TemplateArgumentListInfo *TemplateArgs) {
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002271 // FIXME: Can we do any checking at this point? I guess we could check the
2272 // template arguments that we have against the template name, if the template
Mike Stump1eb44332009-09-09 15:08:12 +00002273 // name refers to a single template. That's not a terribly common case,
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002274 // though.
Douglas Gregor1be8eec2011-02-19 21:32:49 +00002275 // foo<int> could identify a single function unambiguously
2276 // This approach does NOT work, since f<int>(1);
2277 // gets resolved prior to resorting to overload resolution
2278 // i.e., template<class T> void f(double);
2279 // vs template<class T, class U> void f(U);
John McCallf7a1a742009-11-24 19:00:30 +00002280
2281 // These should be filtered out by our callers.
2282 assert(!R.empty() && "empty lookup results when building templateid");
2283 assert(!R.isAmbiguous() && "ambiguous lookup when building templateid");
2284
John McCallc373d482010-01-27 01:50:18 +00002285 // We don't want lookup warnings at this point.
2286 R.suppressDiagnostics();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002287
John McCallf7a1a742009-11-24 19:00:30 +00002288 UnresolvedLookupExpr *ULE
Douglas Gregorbebbe0d2010-12-15 01:34:56 +00002289 = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
Douglas Gregor4c9be892011-02-28 20:01:57 +00002290 SS.getWithLocInContext(Context),
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002291 TemplateKWLoc,
Abramo Bagnara25777432010-08-11 22:01:17 +00002292 R.getLookupNameInfo(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002293 RequiresADL, TemplateArgs,
Douglas Gregor5a84dec2010-05-23 18:57:34 +00002294 R.begin(), R.end());
John McCallf7a1a742009-11-24 19:00:30 +00002295
2296 return Owned(ULE);
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002297}
2298
John McCallf7a1a742009-11-24 19:00:30 +00002299// We actually only call this from template instantiation.
John McCall60d7b3a2010-08-24 06:29:42 +00002300ExprResult
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00002301Sema::BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS,
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002302 SourceLocation TemplateKWLoc,
Abramo Bagnara25777432010-08-11 22:01:17 +00002303 const DeclarationNameInfo &NameInfo,
Abramo Bagnara9d9922a2012-02-06 14:31:00 +00002304 const TemplateArgumentListInfo *TemplateArgs) {
2305 assert(TemplateArgs || TemplateKWLoc.isValid());
John McCallf7a1a742009-11-24 19:00:30 +00002306 DeclContext *DC;
2307 if (!(DC = computeDeclContext(SS, false)) ||
2308 DC->isDependentContext() ||
John McCall77bb1aa2010-05-01 00:40:08 +00002309 RequireCompleteDeclContext(SS, DC))
Abramo Bagnara9d9922a2012-02-06 14:31:00 +00002310 return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs);
Mike Stump1eb44332009-09-09 15:08:12 +00002311
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002312 bool MemberOfUnknownSpecialization;
Abramo Bagnara25777432010-08-11 22:01:17 +00002313 LookupResult R(*this, NameInfo, LookupOrdinaryName);
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002314 LookupTemplateName(R, (Scope*) 0, SS, QualType(), /*Entering*/ false,
2315 MemberOfUnknownSpecialization);
Mike Stump1eb44332009-09-09 15:08:12 +00002316
John McCallf7a1a742009-11-24 19:00:30 +00002317 if (R.isAmbiguous())
2318 return ExprError();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002319
John McCallf7a1a742009-11-24 19:00:30 +00002320 if (R.empty()) {
Abramo Bagnara25777432010-08-11 22:01:17 +00002321 Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_non_template)
2322 << NameInfo.getName() << SS.getRange();
John McCallf7a1a742009-11-24 19:00:30 +00002323 return ExprError();
2324 }
2325
2326 if (ClassTemplateDecl *Temp = R.getAsSingle<ClassTemplateDecl>()) {
Abramo Bagnara25777432010-08-11 22:01:17 +00002327 Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_class_template)
2328 << (NestedNameSpecifier*) SS.getScopeRep()
2329 << NameInfo.getName() << SS.getRange();
John McCallf7a1a742009-11-24 19:00:30 +00002330 Diag(Temp->getLocation(), diag::note_referenced_class_template);
2331 return ExprError();
2332 }
2333
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002334 return BuildTemplateIdExpr(SS, TemplateKWLoc, R, /*ADL*/ false, TemplateArgs);
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002335}
2336
Douglas Gregorc45c2322009-03-31 00:43:58 +00002337/// \brief Form a dependent template name.
2338///
2339/// This action forms a dependent template name given the template
2340/// name and its (presumably dependent) scope specifier. For
2341/// example, given "MetaFun::template apply", the scope specifier \p
2342/// SS will be "MetaFun::", \p TemplateKWLoc contains the location
2343/// of the "template" keyword, and "apply" is the \p Name.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002344TemplateNameKind Sema::ActOnDependentTemplateName(Scope *S,
Douglas Gregord6ab2322010-06-16 23:00:59 +00002345 CXXScopeSpec &SS,
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002346 SourceLocation TemplateKWLoc,
Douglas Gregord6ab2322010-06-16 23:00:59 +00002347 UnqualifiedId &Name,
John McCallb3d87482010-08-24 05:47:05 +00002348 ParsedType ObjectType,
Douglas Gregord6ab2322010-06-16 23:00:59 +00002349 bool EnteringContext,
2350 TemplateTy &Result) {
Richard Smithebaf0e62011-10-18 20:49:44 +00002351 if (TemplateKWLoc.isValid() && S && !S->getTemplateParamParent())
2352 Diag(TemplateKWLoc,
Richard Smith80ad52f2013-01-02 11:42:31 +00002353 getLangOpts().CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00002354 diag::warn_cxx98_compat_template_outside_of_template :
2355 diag::ext_template_outside_of_template)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002356 << FixItHint::CreateRemoval(TemplateKWLoc);
2357
Douglas Gregor0707bc52010-01-19 16:01:07 +00002358 DeclContext *LookupCtx = 0;
2359 if (SS.isSet())
2360 LookupCtx = computeDeclContext(SS, EnteringContext);
2361 if (!LookupCtx && ObjectType)
John McCallb3d87482010-08-24 05:47:05 +00002362 LookupCtx = computeDeclContext(ObjectType.get());
Douglas Gregor0707bc52010-01-19 16:01:07 +00002363 if (LookupCtx) {
Douglas Gregorc45c2322009-03-31 00:43:58 +00002364 // C++0x [temp.names]p5:
2365 // If a name prefixed by the keyword template is not the name of
2366 // a template, the program is ill-formed. [Note: the keyword
2367 // template may not be applied to non-template members of class
2368 // templates. -end note ] [ Note: as is the case with the
2369 // typename prefix, the template prefix is allowed in cases
2370 // where it is not strictly necessary; i.e., when the
2371 // nested-name-specifier or the expression on the left of the ->
2372 // or . is not dependent on a template-parameter, or the use
2373 // does not appear in the scope of a template. -end note]
2374 //
2375 // Note: C++03 was more strict here, because it banned the use of
2376 // the "template" keyword prior to a template-name that was not a
2377 // dependent name. C++ DR468 relaxed this requirement (the
2378 // "template" keyword is now permitted). We follow the C++0x
Douglas Gregor732281d2010-06-14 22:07:54 +00002379 // rules, even in C++03 mode with a warning, retroactively applying the DR.
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002380 bool MemberOfUnknownSpecialization;
Richard Smithd6537012012-11-15 00:31:27 +00002381 TemplateNameKind TNK = isTemplateName(S, SS, TemplateKWLoc.isValid(), Name,
Abramo Bagnara7c153532010-08-06 12:11:11 +00002382 ObjectType, EnteringContext, Result,
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002383 MemberOfUnknownSpecialization);
Douglas Gregor0707bc52010-01-19 16:01:07 +00002384 if (TNK == TNK_Non_template && LookupCtx->isDependentContext() &&
2385 isa<CXXRecordDecl>(LookupCtx) &&
Douglas Gregord078bd22011-03-11 23:27:41 +00002386 (!cast<CXXRecordDecl>(LookupCtx)->hasDefinition() ||
2387 cast<CXXRecordDecl>(LookupCtx)->hasAnyDependentBases())) {
Douglas Gregord6ab2322010-06-16 23:00:59 +00002388 // This is a dependent template. Handle it below.
Douglas Gregor9edad9b2010-01-14 17:47:39 +00002389 } else if (TNK == TNK_Non_template) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00002390 Diag(Name.getLocStart(),
Douglas Gregor014e88d2009-11-03 23:16:33 +00002391 diag::err_template_kw_refers_to_non_template)
Abramo Bagnara25777432010-08-11 22:01:17 +00002392 << GetNameFromUnqualifiedId(Name).getName()
Douglas Gregor0278e122010-05-05 05:58:24 +00002393 << Name.getSourceRange()
2394 << TemplateKWLoc;
Douglas Gregord6ab2322010-06-16 23:00:59 +00002395 return TNK_Non_template;
Douglas Gregor9edad9b2010-01-14 17:47:39 +00002396 } else {
2397 // We found something; return it.
Douglas Gregord6ab2322010-06-16 23:00:59 +00002398 return TNK;
Douglas Gregorc45c2322009-03-31 00:43:58 +00002399 }
Douglas Gregorc45c2322009-03-31 00:43:58 +00002400 }
2401
Mike Stump1eb44332009-09-09 15:08:12 +00002402 NestedNameSpecifier *Qualifier
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002403 = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002404
Douglas Gregor014e88d2009-11-03 23:16:33 +00002405 switch (Name.getKind()) {
2406 case UnqualifiedId::IK_Identifier:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002407 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
Douglas Gregord6ab2322010-06-16 23:00:59 +00002408 Name.Identifier));
2409 return TNK_Dependent_template_name;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002410
Douglas Gregorca1bdd72009-11-04 00:56:37 +00002411 case UnqualifiedId::IK_OperatorFunctionId:
Douglas Gregord6ab2322010-06-16 23:00:59 +00002412 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
Douglas Gregorca1bdd72009-11-04 00:56:37 +00002413 Name.OperatorFunctionId.Operator));
Douglas Gregord6ab2322010-06-16 23:00:59 +00002414 return TNK_Dependent_template_name;
Sean Hunte6252d12009-11-28 08:58:14 +00002415
2416 case UnqualifiedId::IK_LiteralOperatorId:
David Blaikieb219cfc2011-09-23 05:06:16 +00002417 llvm_unreachable(
2418 "We don't support these; Parse shouldn't have allowed propagation");
Sean Hunte6252d12009-11-28 08:58:14 +00002419
Douglas Gregor014e88d2009-11-03 23:16:33 +00002420 default:
2421 break;
2422 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002423
Daniel Dunbar96a00142012-03-09 18:35:03 +00002424 Diag(Name.getLocStart(),
Douglas Gregor014e88d2009-11-03 23:16:33 +00002425 diag::err_template_kw_refers_to_non_template)
Abramo Bagnara25777432010-08-11 22:01:17 +00002426 << GetNameFromUnqualifiedId(Name).getName()
Douglas Gregor0278e122010-05-05 05:58:24 +00002427 << Name.getSourceRange()
2428 << TemplateKWLoc;
Douglas Gregord6ab2322010-06-16 23:00:59 +00002429 return TNK_Non_template;
Douglas Gregorc45c2322009-03-31 00:43:58 +00002430}
2431
Mike Stump1eb44332009-09-09 15:08:12 +00002432bool Sema::CheckTemplateTypeArgument(TemplateTypeParmDecl *Param,
John McCall833ca992009-10-29 08:12:44 +00002433 const TemplateArgumentLoc &AL,
Chris Lattner5f9e2722011-07-23 10:55:15 +00002434 SmallVectorImpl<TemplateArgument> &Converted) {
John McCall833ca992009-10-29 08:12:44 +00002435 const TemplateArgument &Arg = AL.getArgument();
2436
Anders Carlsson436b1562009-06-13 00:33:33 +00002437 // Check template type parameter.
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002438 switch(Arg.getKind()) {
2439 case TemplateArgument::Type:
Anders Carlsson436b1562009-06-13 00:33:33 +00002440 // C++ [temp.arg.type]p1:
2441 // A template-argument for a template-parameter which is a
2442 // type shall be a type-id.
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002443 break;
2444 case TemplateArgument::Template: {
2445 // We have a template type parameter but the template argument
2446 // is a template without any arguments.
2447 SourceRange SR = AL.getSourceRange();
2448 TemplateName Name = Arg.getAsTemplate();
2449 Diag(SR.getBegin(), diag::err_template_missing_args)
2450 << Name << SR;
2451 if (TemplateDecl *Decl = Name.getAsTemplateDecl())
2452 Diag(Decl->getLocation(), diag::note_template_decl_here);
Anders Carlsson436b1562009-06-13 00:33:33 +00002453
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002454 return true;
2455 }
Kaelyn Uhrainab7ad722012-05-18 23:42:49 +00002456 case TemplateArgument::Expression: {
2457 // We have a template type parameter but the template argument is an
2458 // expression; see if maybe it is missing the "typename" keyword.
2459 CXXScopeSpec SS;
2460 DeclarationNameInfo NameInfo;
2461
2462 if (DeclRefExpr *ArgExpr = dyn_cast<DeclRefExpr>(Arg.getAsExpr())) {
2463 SS.Adopt(ArgExpr->getQualifierLoc());
2464 NameInfo = ArgExpr->getNameInfo();
2465 } else if (DependentScopeDeclRefExpr *ArgExpr =
2466 dyn_cast<DependentScopeDeclRefExpr>(Arg.getAsExpr())) {
2467 SS.Adopt(ArgExpr->getQualifierLoc());
2468 NameInfo = ArgExpr->getNameInfo();
2469 } else if (CXXDependentScopeMemberExpr *ArgExpr =
2470 dyn_cast<CXXDependentScopeMemberExpr>(Arg.getAsExpr())) {
Kaelyn Uhrain8c14de82012-06-08 01:07:26 +00002471 if (ArgExpr->isImplicitAccess()) {
2472 SS.Adopt(ArgExpr->getQualifierLoc());
2473 NameInfo = ArgExpr->getMemberNameInfo();
2474 }
Kaelyn Uhrainab7ad722012-05-18 23:42:49 +00002475 }
2476
Kaelyn Uhrain8c14de82012-06-08 01:07:26 +00002477 if (NameInfo.getName().isIdentifier()) {
Kaelyn Uhrainab7ad722012-05-18 23:42:49 +00002478 LookupResult Result(*this, NameInfo, LookupOrdinaryName);
2479 LookupParsedName(Result, CurScope, &SS);
2480
Kaelyn Uhrain8c14de82012-06-08 01:07:26 +00002481 if (Result.getAsSingle<TypeDecl>() ||
2482 Result.getResultKind() ==
2483 LookupResult::NotFoundInCurrentInstantiation) {
2484 // FIXME: Add a FixIt and fix up the template argument for recovery.
Kaelyn Uhrainab7ad722012-05-18 23:42:49 +00002485 SourceLocation Loc = AL.getSourceRange().getBegin();
2486 Diag(Loc, diag::err_template_arg_must_be_type_suggest);
2487 Diag(Param->getLocation(), diag::note_template_param_here);
2488 return true;
2489 }
2490 }
2491 // fallthrough
2492 }
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002493 default: {
Anders Carlsson436b1562009-06-13 00:33:33 +00002494 // We have a template type parameter but the template argument
2495 // is not a type.
John McCall828bff22009-10-29 18:45:58 +00002496 SourceRange SR = AL.getSourceRange();
2497 Diag(SR.getBegin(), diag::err_template_arg_must_be_type) << SR;
Anders Carlsson436b1562009-06-13 00:33:33 +00002498 Diag(Param->getLocation(), diag::note_template_param_here);
Mike Stump1eb44332009-09-09 15:08:12 +00002499
Anders Carlsson436b1562009-06-13 00:33:33 +00002500 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00002501 }
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002502 }
Anders Carlsson436b1562009-06-13 00:33:33 +00002503
John McCalla93c9342009-12-07 02:54:59 +00002504 if (CheckTemplateArgument(Param, AL.getTypeSourceInfo()))
Anders Carlsson436b1562009-06-13 00:33:33 +00002505 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00002506
Anders Carlsson436b1562009-06-13 00:33:33 +00002507 // Add the converted template type argument.
Douglas Gregore559ca12011-06-17 22:11:49 +00002508 QualType ArgType = Context.getCanonicalType(Arg.getAsType());
2509
2510 // Objective-C ARC:
2511 // If an explicitly-specified template argument type is a lifetime type
2512 // with no lifetime qualifier, the __strong lifetime qualifier is inferred.
David Blaikie4e4d0842012-03-11 07:00:24 +00002513 if (getLangOpts().ObjCAutoRefCount &&
Douglas Gregore559ca12011-06-17 22:11:49 +00002514 ArgType->isObjCLifetimeType() &&
2515 !ArgType.getObjCLifetime()) {
2516 Qualifiers Qs;
2517 Qs.setObjCLifetime(Qualifiers::OCL_Strong);
2518 ArgType = Context.getQualifiedType(ArgType, Qs);
2519 }
2520
2521 Converted.push_back(TemplateArgument(ArgType));
Anders Carlsson436b1562009-06-13 00:33:33 +00002522 return false;
2523}
2524
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002525/// \brief Substitute template arguments into the default template argument for
2526/// the given template type parameter.
2527///
2528/// \param SemaRef the semantic analysis object for which we are performing
2529/// the substitution.
2530///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002531/// \param Template the template that we are synthesizing template arguments
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002532/// for.
2533///
2534/// \param TemplateLoc the location of the template name that started the
2535/// template-id we are checking.
2536///
2537/// \param RAngleLoc the location of the right angle bracket ('>') that
2538/// terminates the template-id.
2539///
2540/// \param Param the template template parameter whose default we are
2541/// substituting into.
2542///
2543/// \param Converted the list of template arguments provided for template
2544/// parameters that precede \p Param in the template parameter list.
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002545/// \returns the substituted template argument, or NULL if an error occurred.
John McCalla93c9342009-12-07 02:54:59 +00002546static TypeSourceInfo *
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002547SubstDefaultTemplateArgument(Sema &SemaRef,
2548 TemplateDecl *Template,
2549 SourceLocation TemplateLoc,
2550 SourceLocation RAngleLoc,
2551 TemplateTypeParmDecl *Param,
Chris Lattner5f9e2722011-07-23 10:55:15 +00002552 SmallVectorImpl<TemplateArgument> &Converted) {
John McCalla93c9342009-12-07 02:54:59 +00002553 TypeSourceInfo *ArgType = Param->getDefaultArgumentInfo();
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002554
2555 // If the argument type is dependent, instantiate it now based
2556 // on the previously-computed template arguments.
2557 if (ArgType->getType()->isDependentType()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002558 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00002559 Converted.data(), Converted.size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002560
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002561 MultiLevelTemplateArgumentList AllTemplateArgs
2562 = SemaRef.getTemplateInstantiationArgs(Template, &TemplateArgs);
2563
2564 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
Richard Smith7e54fb52012-07-16 01:09:10 +00002565 Template, Converted,
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002566 SourceRange(TemplateLoc, RAngleLoc));
Richard Smithab91ef12012-07-08 02:38:24 +00002567 if (Inst)
2568 return 0;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002569
Argyrios Kyrtzidisad579912012-04-25 18:39:17 +00002570 Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext());
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002571 ArgType = SemaRef.SubstType(ArgType, AllTemplateArgs,
2572 Param->getDefaultArgumentLoc(),
2573 Param->getDeclName());
2574 }
2575
2576 return ArgType;
2577}
2578
2579/// \brief Substitute template arguments into the default template argument for
2580/// the given non-type template parameter.
2581///
2582/// \param SemaRef the semantic analysis object for which we are performing
2583/// the substitution.
2584///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002585/// \param Template the template that we are synthesizing template arguments
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002586/// for.
2587///
2588/// \param TemplateLoc the location of the template name that started the
2589/// template-id we are checking.
2590///
2591/// \param RAngleLoc the location of the right angle bracket ('>') that
2592/// terminates the template-id.
2593///
Douglas Gregor788cd062009-11-11 01:00:40 +00002594/// \param Param the non-type template parameter whose default we are
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002595/// substituting into.
2596///
2597/// \param Converted the list of template arguments provided for template
2598/// parameters that precede \p Param in the template parameter list.
2599///
2600/// \returns the substituted template argument, or NULL if an error occurred.
John McCall60d7b3a2010-08-24 06:29:42 +00002601static ExprResult
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002602SubstDefaultTemplateArgument(Sema &SemaRef,
2603 TemplateDecl *Template,
2604 SourceLocation TemplateLoc,
2605 SourceLocation RAngleLoc,
2606 NonTypeTemplateParmDecl *Param,
Chris Lattner5f9e2722011-07-23 10:55:15 +00002607 SmallVectorImpl<TemplateArgument> &Converted) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002608 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00002609 Converted.data(), Converted.size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002610
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002611 MultiLevelTemplateArgumentList AllTemplateArgs
2612 = SemaRef.getTemplateInstantiationArgs(Template, &TemplateArgs);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002613
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002614 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
Richard Smith7e54fb52012-07-16 01:09:10 +00002615 Template, Converted,
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002616 SourceRange(TemplateLoc, RAngleLoc));
Richard Smithab91ef12012-07-08 02:38:24 +00002617 if (Inst)
2618 return ExprError();
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002619
Argyrios Kyrtzidisad579912012-04-25 18:39:17 +00002620 Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext());
Eli Friedman9b94cd12012-04-26 22:43:24 +00002621 EnterExpressionEvaluationContext Unevaluated(SemaRef, Sema::Unevaluated);
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002622 return SemaRef.SubstExpr(Param->getDefaultArgument(), AllTemplateArgs);
2623}
2624
Douglas Gregor788cd062009-11-11 01:00:40 +00002625/// \brief Substitute template arguments into the default template argument for
2626/// the given template template parameter.
2627///
2628/// \param SemaRef the semantic analysis object for which we are performing
2629/// the substitution.
2630///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002631/// \param Template the template that we are synthesizing template arguments
Douglas Gregor788cd062009-11-11 01:00:40 +00002632/// for.
2633///
2634/// \param TemplateLoc the location of the template name that started the
2635/// template-id we are checking.
2636///
2637/// \param RAngleLoc the location of the right angle bracket ('>') that
2638/// terminates the template-id.
2639///
2640/// \param Param the template template parameter whose default we are
2641/// substituting into.
2642///
2643/// \param Converted the list of template arguments provided for template
2644/// parameters that precede \p Param in the template parameter list.
2645///
Douglas Gregor1d752d72011-03-02 18:46:51 +00002646/// \param QualifierLoc Will be set to the nested-name-specifier (with
2647/// source-location information) that precedes the template name.
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002648///
Douglas Gregor788cd062009-11-11 01:00:40 +00002649/// \returns the substituted template argument, or NULL if an error occurred.
2650static TemplateName
2651SubstDefaultTemplateArgument(Sema &SemaRef,
2652 TemplateDecl *Template,
2653 SourceLocation TemplateLoc,
2654 SourceLocation RAngleLoc,
2655 TemplateTemplateParmDecl *Param,
Chris Lattner5f9e2722011-07-23 10:55:15 +00002656 SmallVectorImpl<TemplateArgument> &Converted,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002657 NestedNameSpecifierLoc &QualifierLoc) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002658 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00002659 Converted.data(), Converted.size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002660
Douglas Gregor788cd062009-11-11 01:00:40 +00002661 MultiLevelTemplateArgumentList AllTemplateArgs
2662 = SemaRef.getTemplateInstantiationArgs(Template, &TemplateArgs);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002663
Douglas Gregor788cd062009-11-11 01:00:40 +00002664 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
Richard Smith7e54fb52012-07-16 01:09:10 +00002665 Template, Converted,
Douglas Gregor788cd062009-11-11 01:00:40 +00002666 SourceRange(TemplateLoc, RAngleLoc));
Richard Smithab91ef12012-07-08 02:38:24 +00002667 if (Inst)
2668 return TemplateName();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002669
Argyrios Kyrtzidisad579912012-04-25 18:39:17 +00002670 Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext());
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002671 // Substitute into the nested-name-specifier first,
Douglas Gregor1d752d72011-03-02 18:46:51 +00002672 QualifierLoc = Param->getDefaultArgument().getTemplateQualifierLoc();
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002673 if (QualifierLoc) {
2674 QualifierLoc = SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc,
2675 AllTemplateArgs);
2676 if (!QualifierLoc)
2677 return TemplateName();
2678 }
2679
Douglas Gregor1d752d72011-03-02 18:46:51 +00002680 return SemaRef.SubstTemplateName(QualifierLoc,
Douglas Gregor788cd062009-11-11 01:00:40 +00002681 Param->getDefaultArgument().getArgument().getAsTemplate(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002682 Param->getDefaultArgument().getTemplateNameLoc(),
Douglas Gregor788cd062009-11-11 01:00:40 +00002683 AllTemplateArgs);
2684}
2685
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002686/// \brief If the given template parameter has a default template
2687/// argument, substitute into that default template argument and
2688/// return the corresponding template argument.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002689TemplateArgumentLoc
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002690Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
2691 SourceLocation TemplateLoc,
2692 SourceLocation RAngleLoc,
2693 Decl *Param,
Richard Smith305e5b42013-07-04 01:01:24 +00002694 SmallVectorImpl<TemplateArgument>
2695 &Converted,
2696 bool &HasDefaultArg) {
2697 HasDefaultArg = false;
2698
2699 if (TemplateTypeParmDecl *TypeParm = dyn_cast<TemplateTypeParmDecl>(Param)) {
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002700 if (!TypeParm->hasDefaultArgument())
2701 return TemplateArgumentLoc();
2702
Richard Smith305e5b42013-07-04 01:01:24 +00002703 HasDefaultArg = true;
John McCalla93c9342009-12-07 02:54:59 +00002704 TypeSourceInfo *DI = SubstDefaultTemplateArgument(*this, Template,
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002705 TemplateLoc,
2706 RAngleLoc,
2707 TypeParm,
2708 Converted);
2709 if (DI)
2710 return TemplateArgumentLoc(TemplateArgument(DI->getType()), DI);
2711
2712 return TemplateArgumentLoc();
2713 }
2714
2715 if (NonTypeTemplateParmDecl *NonTypeParm
2716 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
2717 if (!NonTypeParm->hasDefaultArgument())
2718 return TemplateArgumentLoc();
2719
Richard Smith305e5b42013-07-04 01:01:24 +00002720 HasDefaultArg = true;
John McCall60d7b3a2010-08-24 06:29:42 +00002721 ExprResult Arg = SubstDefaultTemplateArgument(*this, Template,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002722 TemplateLoc,
2723 RAngleLoc,
2724 NonTypeParm,
2725 Converted);
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002726 if (Arg.isInvalid())
2727 return TemplateArgumentLoc();
2728
2729 Expr *ArgE = Arg.takeAs<Expr>();
2730 return TemplateArgumentLoc(TemplateArgument(ArgE), ArgE);
2731 }
2732
2733 TemplateTemplateParmDecl *TempTempParm
2734 = cast<TemplateTemplateParmDecl>(Param);
2735 if (!TempTempParm->hasDefaultArgument())
2736 return TemplateArgumentLoc();
2737
Richard Smith305e5b42013-07-04 01:01:24 +00002738 HasDefaultArg = true;
Douglas Gregor1d752d72011-03-02 18:46:51 +00002739 NestedNameSpecifierLoc QualifierLoc;
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002740 TemplateName TName = SubstDefaultTemplateArgument(*this, Template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002741 TemplateLoc,
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002742 RAngleLoc,
2743 TempTempParm,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002744 Converted,
2745 QualifierLoc);
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002746 if (TName.isNull())
2747 return TemplateArgumentLoc();
2748
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002749 return TemplateArgumentLoc(TemplateArgument(TName),
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002750 TempTempParm->getDefaultArgument().getTemplateQualifierLoc(),
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002751 TempTempParm->getDefaultArgument().getTemplateNameLoc());
2752}
2753
Douglas Gregore7526412009-11-11 19:31:23 +00002754/// \brief Check that the given template argument corresponds to the given
2755/// template parameter.
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002756///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002757/// \param Param The template parameter against which the argument will be
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002758/// checked.
2759///
2760/// \param Arg The template argument.
2761///
2762/// \param Template The template in which the template argument resides.
2763///
2764/// \param TemplateLoc The location of the template name for the template
2765/// whose argument list we're matching.
2766///
2767/// \param RAngleLoc The location of the right angle bracket ('>') that closes
2768/// the template argument list.
2769///
2770/// \param ArgumentPackIndex The index into the argument pack where this
2771/// argument will be placed. Only valid if the parameter is a parameter pack.
2772///
2773/// \param Converted The checked, converted argument will be added to the
2774/// end of this small vector.
2775///
2776/// \param CTAK Describes how we arrived at this particular template argument:
2777/// explicitly written, deduced, etc.
2778///
2779/// \returns true on error, false otherwise.
Douglas Gregore7526412009-11-11 19:31:23 +00002780bool Sema::CheckTemplateArgument(NamedDecl *Param,
2781 const TemplateArgumentLoc &Arg,
Douglas Gregor54c53cc2011-01-04 23:35:54 +00002782 NamedDecl *Template,
Douglas Gregore7526412009-11-11 19:31:23 +00002783 SourceLocation TemplateLoc,
Douglas Gregore7526412009-11-11 19:31:23 +00002784 SourceLocation RAngleLoc,
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002785 unsigned ArgumentPackIndex,
Chris Lattner5f9e2722011-07-23 10:55:15 +00002786 SmallVectorImpl<TemplateArgument> &Converted,
Douglas Gregor02024a92010-03-28 02:42:43 +00002787 CheckTemplateArgumentKind CTAK) {
Douglas Gregord9e15302009-11-11 19:41:09 +00002788 // Check template type parameters.
2789 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param))
Douglas Gregore7526412009-11-11 19:31:23 +00002790 return CheckTemplateTypeArgument(TTP, Arg, Converted);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002791
Douglas Gregord9e15302009-11-11 19:41:09 +00002792 // Check non-type template parameters.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002793 if (NonTypeTemplateParmDecl *NTTP =dyn_cast<NonTypeTemplateParmDecl>(Param)) {
Douglas Gregore7526412009-11-11 19:31:23 +00002794 // Do substitution on the type of the non-type template parameter
Peter Collingbourne9f6f6a12010-12-10 17:08:53 +00002795 // with the template arguments we've seen thus far. But if the
2796 // template has a dependent context then we cannot substitute yet.
Douglas Gregore7526412009-11-11 19:31:23 +00002797 QualType NTTPType = NTTP->getType();
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002798 if (NTTP->isParameterPack() && NTTP->isExpandedParameterPack())
2799 NTTPType = NTTP->getExpansionType(ArgumentPackIndex);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002800
Peter Collingbourne9f6f6a12010-12-10 17:08:53 +00002801 if (NTTPType->isDependentType() &&
2802 !isa<TemplateTemplateParmDecl>(Template) &&
2803 !Template->getDeclContext()->isDependentContext()) {
Douglas Gregore7526412009-11-11 19:31:23 +00002804 // Do substitution on the type of the non-type template parameter.
2805 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
Richard Smith7e54fb52012-07-16 01:09:10 +00002806 NTTP, Converted,
Douglas Gregore7526412009-11-11 19:31:23 +00002807 SourceRange(TemplateLoc, RAngleLoc));
Richard Smithab91ef12012-07-08 02:38:24 +00002808 if (Inst)
2809 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002810
2811 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00002812 Converted.data(), Converted.size());
Douglas Gregore7526412009-11-11 19:31:23 +00002813 NTTPType = SubstType(NTTPType,
2814 MultiLevelTemplateArgumentList(TemplateArgs),
2815 NTTP->getLocation(),
2816 NTTP->getDeclName());
2817 // If that worked, check the non-type template parameter type
2818 // for validity.
2819 if (!NTTPType.isNull())
2820 NTTPType = CheckNonTypeTemplateParameterType(NTTPType,
2821 NTTP->getLocation());
2822 if (NTTPType.isNull())
2823 return true;
2824 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002825
Douglas Gregore7526412009-11-11 19:31:23 +00002826 switch (Arg.getArgument().getKind()) {
2827 case TemplateArgument::Null:
David Blaikieb219cfc2011-09-23 05:06:16 +00002828 llvm_unreachable("Should never see a NULL template argument here");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002829
Douglas Gregore7526412009-11-11 19:31:23 +00002830 case TemplateArgument::Expression: {
Douglas Gregore7526412009-11-11 19:31:23 +00002831 TemplateArgument Result;
John Wiegley429bb272011-04-08 18:41:53 +00002832 ExprResult Res =
2833 CheckTemplateArgument(NTTP, NTTPType, Arg.getArgument().getAsExpr(),
2834 Result, CTAK);
2835 if (Res.isInvalid())
Douglas Gregore7526412009-11-11 19:31:23 +00002836 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002837
Douglas Gregor910f8002010-11-07 23:05:16 +00002838 Converted.push_back(Result);
Douglas Gregore7526412009-11-11 19:31:23 +00002839 break;
2840 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002841
Douglas Gregore7526412009-11-11 19:31:23 +00002842 case TemplateArgument::Declaration:
2843 case TemplateArgument::Integral:
Eli Friedmand7a6b162012-09-26 02:36:12 +00002844 case TemplateArgument::NullPtr:
Douglas Gregore7526412009-11-11 19:31:23 +00002845 // We've already checked this template argument, so just copy
2846 // it to the list of converted arguments.
Douglas Gregor910f8002010-11-07 23:05:16 +00002847 Converted.push_back(Arg.getArgument());
Douglas Gregore7526412009-11-11 19:31:23 +00002848 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002849
Douglas Gregore7526412009-11-11 19:31:23 +00002850 case TemplateArgument::Template:
Douglas Gregora7fc9012011-01-05 18:58:31 +00002851 case TemplateArgument::TemplateExpansion:
Douglas Gregore7526412009-11-11 19:31:23 +00002852 // We were given a template template argument. It may not be ill-formed;
2853 // see below.
2854 if (DependentTemplateName *DTN
Douglas Gregora7fc9012011-01-05 18:58:31 +00002855 = Arg.getArgument().getAsTemplateOrTemplatePattern()
2856 .getAsDependentTemplateName()) {
Douglas Gregore7526412009-11-11 19:31:23 +00002857 // We have a template argument such as \c T::template X, which we
2858 // parsed as a template template argument. However, since we now
2859 // know that we need a non-type template argument, convert this
Abramo Bagnara25777432010-08-11 22:01:17 +00002860 // template name into an expression.
2861
2862 DeclarationNameInfo NameInfo(DTN->getIdentifier(),
2863 Arg.getTemplateNameLoc());
2864
Douglas Gregor00cf3cc2011-02-25 20:49:16 +00002865 CXXScopeSpec SS;
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002866 SS.Adopt(Arg.getTemplateQualifierLoc());
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002867 // FIXME: the template-template arg was a DependentTemplateName,
2868 // so it was provided with a template keyword. However, its source
2869 // location is not stored in the template argument structure.
2870 SourceLocation TemplateKWLoc;
John Wiegley429bb272011-04-08 18:41:53 +00002871 ExprResult E = Owned(DependentScopeDeclRefExpr::Create(Context,
Douglas Gregor00cf3cc2011-02-25 20:49:16 +00002872 SS.getWithLocInContext(Context),
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002873 TemplateKWLoc,
2874 NameInfo, 0));
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002875
Douglas Gregora7fc9012011-01-05 18:58:31 +00002876 // If we parsed the template argument as a pack expansion, create a
2877 // pack expansion expression.
2878 if (Arg.getArgument().getKind() == TemplateArgument::TemplateExpansion){
John Wiegley429bb272011-04-08 18:41:53 +00002879 E = ActOnPackExpansion(E.take(), Arg.getTemplateEllipsisLoc());
2880 if (E.isInvalid())
Douglas Gregora7fc9012011-01-05 18:58:31 +00002881 return true;
Douglas Gregora7fc9012011-01-05 18:58:31 +00002882 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002883
Douglas Gregore7526412009-11-11 19:31:23 +00002884 TemplateArgument Result;
John Wiegley429bb272011-04-08 18:41:53 +00002885 E = CheckTemplateArgument(NTTP, NTTPType, E.take(), Result);
2886 if (E.isInvalid())
Douglas Gregore7526412009-11-11 19:31:23 +00002887 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002888
Douglas Gregor910f8002010-11-07 23:05:16 +00002889 Converted.push_back(Result);
Douglas Gregore7526412009-11-11 19:31:23 +00002890 break;
2891 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002892
Douglas Gregore7526412009-11-11 19:31:23 +00002893 // We have a template argument that actually does refer to a class
Richard Smith3e4c6c42011-05-05 21:57:07 +00002894 // template, alias template, or template template parameter, and
Douglas Gregore7526412009-11-11 19:31:23 +00002895 // therefore cannot be a non-type template argument.
2896 Diag(Arg.getLocation(), diag::err_template_arg_must_be_expr)
2897 << Arg.getSourceRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002898
Douglas Gregore7526412009-11-11 19:31:23 +00002899 Diag(Param->getLocation(), diag::note_template_param_here);
2900 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002901
Douglas Gregore7526412009-11-11 19:31:23 +00002902 case TemplateArgument::Type: {
2903 // We have a non-type template parameter but the template
2904 // argument is a type.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002905
Douglas Gregore7526412009-11-11 19:31:23 +00002906 // C++ [temp.arg]p2:
2907 // In a template-argument, an ambiguity between a type-id and
2908 // an expression is resolved to a type-id, regardless of the
2909 // form of the corresponding template-parameter.
2910 //
2911 // We warn specifically about this case, since it can be rather
2912 // confusing for users.
2913 QualType T = Arg.getArgument().getAsType();
2914 SourceRange SR = Arg.getSourceRange();
2915 if (T->isFunctionType())
2916 Diag(SR.getBegin(), diag::err_template_arg_nontype_ambig) << SR << T;
2917 else
2918 Diag(SR.getBegin(), diag::err_template_arg_must_be_expr) << SR;
2919 Diag(Param->getLocation(), diag::note_template_param_here);
2920 return true;
2921 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002922
Douglas Gregore7526412009-11-11 19:31:23 +00002923 case TemplateArgument::Pack:
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +00002924 llvm_unreachable("Caller must expand template argument packs");
Douglas Gregore7526412009-11-11 19:31:23 +00002925 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002926
Douglas Gregore7526412009-11-11 19:31:23 +00002927 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002928 }
2929
2930
Douglas Gregore7526412009-11-11 19:31:23 +00002931 // Check template template parameters.
2932 TemplateTemplateParmDecl *TempParm = cast<TemplateTemplateParmDecl>(Param);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002933
Douglas Gregore7526412009-11-11 19:31:23 +00002934 // Substitute into the template parameter list of the template
2935 // template parameter, since previously-supplied template arguments
2936 // may appear within the template template parameter.
2937 {
2938 // Set up a template instantiation context.
2939 LocalInstantiationScope Scope(*this);
2940 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
Richard Smith7e54fb52012-07-16 01:09:10 +00002941 TempParm, Converted,
Douglas Gregore7526412009-11-11 19:31:23 +00002942 SourceRange(TemplateLoc, RAngleLoc));
Richard Smithab91ef12012-07-08 02:38:24 +00002943 if (Inst)
2944 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002945
2946 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00002947 Converted.data(), Converted.size());
Douglas Gregore7526412009-11-11 19:31:23 +00002948 TempParm = cast_or_null<TemplateTemplateParmDecl>(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002949 SubstDecl(TempParm, CurContext,
Douglas Gregore7526412009-11-11 19:31:23 +00002950 MultiLevelTemplateArgumentList(TemplateArgs)));
2951 if (!TempParm)
2952 return true;
Douglas Gregore7526412009-11-11 19:31:23 +00002953 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002954
Douglas Gregore7526412009-11-11 19:31:23 +00002955 switch (Arg.getArgument().getKind()) {
2956 case TemplateArgument::Null:
David Blaikieb219cfc2011-09-23 05:06:16 +00002957 llvm_unreachable("Should never see a NULL template argument here");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002958
Douglas Gregore7526412009-11-11 19:31:23 +00002959 case TemplateArgument::Template:
Douglas Gregora7fc9012011-01-05 18:58:31 +00002960 case TemplateArgument::TemplateExpansion:
Richard Smith6964b3f2012-09-07 02:06:42 +00002961 if (CheckTemplateArgument(TempParm, Arg, ArgumentPackIndex))
Douglas Gregore7526412009-11-11 19:31:23 +00002962 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002963
Douglas Gregor910f8002010-11-07 23:05:16 +00002964 Converted.push_back(Arg.getArgument());
Douglas Gregore7526412009-11-11 19:31:23 +00002965 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002966
Douglas Gregore7526412009-11-11 19:31:23 +00002967 case TemplateArgument::Expression:
2968 case TemplateArgument::Type:
2969 // We have a template template parameter but the template
2970 // argument does not refer to a template.
Richard Smith3e4c6c42011-05-05 21:57:07 +00002971 Diag(Arg.getLocation(), diag::err_template_arg_must_be_template)
Richard Smith80ad52f2013-01-02 11:42:31 +00002972 << getLangOpts().CPlusPlus11;
Douglas Gregore7526412009-11-11 19:31:23 +00002973 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002974
Douglas Gregore7526412009-11-11 19:31:23 +00002975 case TemplateArgument::Declaration:
David Blaikie7530c032012-01-17 06:56:22 +00002976 llvm_unreachable("Declaration argument with template template parameter");
Douglas Gregore7526412009-11-11 19:31:23 +00002977 case TemplateArgument::Integral:
David Blaikie7530c032012-01-17 06:56:22 +00002978 llvm_unreachable("Integral argument with template template parameter");
Eli Friedmand7a6b162012-09-26 02:36:12 +00002979 case TemplateArgument::NullPtr:
2980 llvm_unreachable("Null pointer argument with template template parameter");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002981
Douglas Gregore7526412009-11-11 19:31:23 +00002982 case TemplateArgument::Pack:
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +00002983 llvm_unreachable("Caller must expand template argument packs");
Douglas Gregore7526412009-11-11 19:31:23 +00002984 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002985
Douglas Gregore7526412009-11-11 19:31:23 +00002986 return false;
2987}
2988
Douglas Gregor8fbbae52012-02-03 07:34:46 +00002989/// \brief Diagnose an arity mismatch in the
2990static bool diagnoseArityMismatch(Sema &S, TemplateDecl *Template,
2991 SourceLocation TemplateLoc,
2992 TemplateArgumentListInfo &TemplateArgs) {
2993 TemplateParameterList *Params = Template->getTemplateParameters();
2994 unsigned NumParams = Params->size();
2995 unsigned NumArgs = TemplateArgs.size();
2996
2997 SourceRange Range;
2998 if (NumArgs > NumParams)
2999 Range = SourceRange(TemplateArgs[NumParams].getLocation(),
3000 TemplateArgs.getRAngleLoc());
3001 S.Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
3002 << (NumArgs > NumParams)
3003 << (isa<ClassTemplateDecl>(Template)? 0 :
3004 isa<FunctionTemplateDecl>(Template)? 1 :
3005 isa<TemplateTemplateParmDecl>(Template)? 2 : 3)
3006 << Template << Range;
3007 S.Diag(Template->getLocation(), diag::note_template_decl_here)
3008 << Params->getSourceRange();
3009 return true;
3010}
3011
Richard Smith6964b3f2012-09-07 02:06:42 +00003012/// \brief Check whether the template parameter is a pack expansion, and if so,
3013/// determine the number of parameters produced by that expansion. For instance:
3014///
3015/// \code
3016/// template<typename ...Ts> struct A {
3017/// template<Ts ...NTs, template<Ts> class ...TTs, typename ...Us> struct B;
3018/// };
3019/// \endcode
3020///
3021/// In \c A<int,int>::B, \c NTs and \c TTs have expanded pack size 2, and \c Us
3022/// is not a pack expansion, so returns an empty Optional.
David Blaikiedc84cd52013-02-20 22:23:23 +00003023static Optional<unsigned> getExpandedPackSize(NamedDecl *Param) {
Richard Smith6964b3f2012-09-07 02:06:42 +00003024 if (NonTypeTemplateParmDecl *NTTP
3025 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
3026 if (NTTP->isExpandedParameterPack())
3027 return NTTP->getNumExpansionTypes();
3028 }
3029
3030 if (TemplateTemplateParmDecl *TTP
3031 = dyn_cast<TemplateTemplateParmDecl>(Param)) {
3032 if (TTP->isExpandedParameterPack())
3033 return TTP->getNumExpansionTemplateParameters();
3034 }
3035
David Blaikie66874fb2013-02-21 01:47:18 +00003036 return None;
Richard Smith6964b3f2012-09-07 02:06:42 +00003037}
3038
Douglas Gregorc15cb382009-02-09 23:23:08 +00003039/// \brief Check that the given template argument list is well-formed
3040/// for specializing the given template.
3041bool Sema::CheckTemplateArgumentList(TemplateDecl *Template,
3042 SourceLocation TemplateLoc,
Douglas Gregor67714232011-03-03 02:41:12 +00003043 TemplateArgumentListInfo &TemplateArgs,
Douglas Gregor16134c62009-07-01 00:28:38 +00003044 bool PartialTemplateArgs,
Douglas Gregorb70126a2012-02-03 17:16:23 +00003045 SmallVectorImpl<TemplateArgument> &Converted,
3046 bool *ExpansionIntoFixedList) {
3047 if (ExpansionIntoFixedList)
3048 *ExpansionIntoFixedList = false;
3049
Douglas Gregorc15cb382009-02-09 23:23:08 +00003050 TemplateParameterList *Params = Template->getTemplateParameters();
Douglas Gregorc15cb382009-02-09 23:23:08 +00003051
John McCalld5532b62009-11-23 01:53:49 +00003052 SourceLocation RAngleLoc = TemplateArgs.getRAngleLoc();
3053
Mike Stump1eb44332009-09-09 15:08:12 +00003054 // C++ [temp.arg]p1:
Douglas Gregorc15cb382009-02-09 23:23:08 +00003055 // [...] The type and form of each template-argument specified in
3056 // a template-id shall match the type and form specified for the
3057 // corresponding parameter declared by the template in its
3058 // template-parameter-list.
Douglas Gregor67714232011-03-03 02:41:12 +00003059 bool isTemplateTemplateParameter = isa<TemplateTemplateParmDecl>(Template);
Chris Lattner5f9e2722011-07-23 10:55:15 +00003060 SmallVector<TemplateArgument, 2> ArgumentPack;
Richard Smith6964b3f2012-09-07 02:06:42 +00003061 unsigned ArgIdx = 0, NumArgs = TemplateArgs.size();
Douglas Gregor8dde14e2011-01-24 16:14:37 +00003062 LocalInstantiationScope InstScope(*this, true);
Richard Smith6964b3f2012-09-07 02:06:42 +00003063 for (TemplateParameterList::iterator Param = Params->begin(),
3064 ParamEnd = Params->end();
3065 Param != ParamEnd; /* increment in loop */) {
3066 // If we have an expanded parameter pack, make sure we don't have too
3067 // many arguments.
David Blaikiedc84cd52013-02-20 22:23:23 +00003068 if (Optional<unsigned> Expansions = getExpandedPackSize(*Param)) {
Richard Smith6964b3f2012-09-07 02:06:42 +00003069 if (*Expansions == ArgumentPack.size()) {
3070 // We're done with this parameter pack. Pack up its arguments and add
3071 // them to the list.
Eli Friedmand7a6b162012-09-26 02:36:12 +00003072 Converted.push_back(
3073 TemplateArgument::CreatePackCopy(Context,
3074 ArgumentPack.data(),
3075 ArgumentPack.size()));
3076 ArgumentPack.clear();
3077
Richard Smith6964b3f2012-09-07 02:06:42 +00003078 // This argument is assigned to the next parameter.
3079 ++Param;
3080 continue;
3081 } else if (ArgIdx == NumArgs && !PartialTemplateArgs) {
3082 // Not enough arguments for this parameter pack.
3083 Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
3084 << false
3085 << (isa<ClassTemplateDecl>(Template)? 0 :
3086 isa<FunctionTemplateDecl>(Template)? 1 :
3087 isa<TemplateTemplateParmDecl>(Template)? 2 : 3)
3088 << Template;
3089 Diag(Template->getLocation(), diag::note_template_decl_here)
3090 << Params->getSourceRange();
3091 return true;
Douglas Gregor6952f1e2011-01-19 20:10:05 +00003092 }
Richard Smith6964b3f2012-09-07 02:06:42 +00003093 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003094
Richard Smith6964b3f2012-09-07 02:06:42 +00003095 if (ArgIdx < NumArgs) {
Douglas Gregorf35f8282009-11-11 21:54:23 +00003096 // Check the template argument we were given.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003097 if (CheckTemplateArgument(*Param, TemplateArgs[ArgIdx], Template,
3098 TemplateLoc, RAngleLoc,
Douglas Gregor6952f1e2011-01-19 20:10:05 +00003099 ArgumentPack.size(), Converted))
Douglas Gregorf35f8282009-11-11 21:54:23 +00003100 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003101
Richard Smith6964b3f2012-09-07 02:06:42 +00003102 // We're now done with this argument.
3103 ++ArgIdx;
3104
Douglas Gregor14be16b2010-12-20 16:57:52 +00003105 if ((*Param)->isTemplateParameterPack()) {
3106 // The template parameter was a template parameter pack, so take the
3107 // deduced argument and place it on the argument pack. Note that we
3108 // stay on the same template parameter so that we can deduce more
3109 // arguments.
3110 ArgumentPack.push_back(Converted.back());
3111 Converted.pop_back();
3112 } else {
3113 // Move to the next template parameter.
3114 ++Param;
3115 }
Richard Smith6964b3f2012-09-07 02:06:42 +00003116
3117 // If we just saw a pack expansion, then directly convert the remaining
3118 // arguments, because we don't know what parameters they'll match up
3119 // with.
3120 if (TemplateArgs[ArgIdx-1].getArgument().isPackExpansion()) {
3121 bool InFinalParameterPack = Param != ParamEnd &&
3122 Param + 1 == ParamEnd &&
3123 (*Param)->isTemplateParameterPack() &&
3124 !getExpandedPackSize(*Param);
3125
3126 if (!InFinalParameterPack && !ArgumentPack.empty()) {
3127 // If we were part way through filling in an expanded parameter pack,
3128 // fall back to just producing individual arguments.
3129 Converted.insert(Converted.end(),
3130 ArgumentPack.begin(), ArgumentPack.end());
3131 ArgumentPack.clear();
3132 }
3133
3134 while (ArgIdx < NumArgs) {
3135 if (InFinalParameterPack)
3136 ArgumentPack.push_back(TemplateArgs[ArgIdx].getArgument());
3137 else
3138 Converted.push_back(TemplateArgs[ArgIdx].getArgument());
3139 ++ArgIdx;
3140 }
3141
3142 // Push the argument pack onto the list of converted arguments.
3143 if (InFinalParameterPack) {
Eli Friedmand7a6b162012-09-26 02:36:12 +00003144 Converted.push_back(
3145 TemplateArgument::CreatePackCopy(Context,
3146 ArgumentPack.data(),
3147 ArgumentPack.size()));
3148 ArgumentPack.clear();
Richard Smith6964b3f2012-09-07 02:06:42 +00003149 } else if (ExpansionIntoFixedList) {
3150 // We have expanded a pack into a fixed list.
3151 *ExpansionIntoFixedList = true;
3152 }
3153
3154 return false;
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003155 }
Richard Smith6964b3f2012-09-07 02:06:42 +00003156
Douglas Gregorf35f8282009-11-11 21:54:23 +00003157 continue;
Douglas Gregor3e00bad2009-02-17 01:05:43 +00003158 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003159
Douglas Gregor8735b292011-06-03 02:59:40 +00003160 // If we're checking a partial template argument list, we're done.
3161 if (PartialTemplateArgs) {
3162 if ((*Param)->isTemplateParameterPack() && !ArgumentPack.empty())
3163 Converted.push_back(TemplateArgument::CreatePackCopy(Context,
3164 ArgumentPack.data(),
3165 ArgumentPack.size()));
3166
Richard Smith6964b3f2012-09-07 02:06:42 +00003167 return false;
Douglas Gregor8735b292011-06-03 02:59:40 +00003168 }
3169
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003170 // If we have a template parameter pack with no more corresponding
Douglas Gregor14be16b2010-12-20 16:57:52 +00003171 // arguments, just break out now and we'll fill in the argument pack below.
Richard Smith6964b3f2012-09-07 02:06:42 +00003172 if ((*Param)->isTemplateParameterPack()) {
3173 assert(!getExpandedPackSize(*Param) &&
3174 "Should have dealt with this already");
3175
3176 // A non-expanded parameter pack before the end of the parameter list
3177 // only occurs for an ill-formed template parameter list, unless we've
3178 // got a partial argument list for a function template, so just bail out.
3179 if (Param + 1 != ParamEnd)
3180 return true;
3181
Eli Friedmand7a6b162012-09-26 02:36:12 +00003182 Converted.push_back(TemplateArgument::CreatePackCopy(Context,
3183 ArgumentPack.data(),
3184 ArgumentPack.size()));
3185 ArgumentPack.clear();
Richard Smith6964b3f2012-09-07 02:06:42 +00003186
3187 ++Param;
3188 continue;
3189 }
3190
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003191 // Check whether we have a default argument.
Douglas Gregorf35f8282009-11-11 21:54:23 +00003192 TemplateArgumentLoc Arg;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003193
Douglas Gregorf35f8282009-11-11 21:54:23 +00003194 // Retrieve the default template argument from the template
3195 // parameter. For each kind of template parameter, we substitute the
3196 // template arguments provided thus far and any "outer" template arguments
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003197 // (when the template parameter was part of a nested template) into
Douglas Gregorf35f8282009-11-11 21:54:23 +00003198 // the default argument.
3199 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*Param)) {
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003200 if (!TTP->hasDefaultArgument())
3201 return diagnoseArityMismatch(*this, Template, TemplateLoc,
3202 TemplateArgs);
Douglas Gregorf35f8282009-11-11 21:54:23 +00003203
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003204 TypeSourceInfo *ArgType = SubstDefaultTemplateArgument(*this,
Douglas Gregorf35f8282009-11-11 21:54:23 +00003205 Template,
3206 TemplateLoc,
3207 RAngleLoc,
3208 TTP,
3209 Converted);
3210 if (!ArgType)
3211 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003212
Douglas Gregorf35f8282009-11-11 21:54:23 +00003213 Arg = TemplateArgumentLoc(TemplateArgument(ArgType->getType()),
3214 ArgType);
3215 } else if (NonTypeTemplateParmDecl *NTTP
3216 = dyn_cast<NonTypeTemplateParmDecl>(*Param)) {
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003217 if (!NTTP->hasDefaultArgument())
3218 return diagnoseArityMismatch(*this, Template, TemplateLoc,
3219 TemplateArgs);
Douglas Gregorf35f8282009-11-11 21:54:23 +00003220
John McCall60d7b3a2010-08-24 06:29:42 +00003221 ExprResult E = SubstDefaultTemplateArgument(*this, Template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003222 TemplateLoc,
3223 RAngleLoc,
3224 NTTP,
Douglas Gregorf35f8282009-11-11 21:54:23 +00003225 Converted);
3226 if (E.isInvalid())
3227 return true;
3228
3229 Expr *Ex = E.takeAs<Expr>();
3230 Arg = TemplateArgumentLoc(TemplateArgument(Ex), Ex);
3231 } else {
3232 TemplateTemplateParmDecl *TempParm
3233 = cast<TemplateTemplateParmDecl>(*Param);
3234
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003235 if (!TempParm->hasDefaultArgument())
3236 return diagnoseArityMismatch(*this, Template, TemplateLoc,
3237 TemplateArgs);
Douglas Gregorf35f8282009-11-11 21:54:23 +00003238
Douglas Gregor1d752d72011-03-02 18:46:51 +00003239 NestedNameSpecifierLoc QualifierLoc;
Douglas Gregorf35f8282009-11-11 21:54:23 +00003240 TemplateName Name = SubstDefaultTemplateArgument(*this, Template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003241 TemplateLoc,
3242 RAngleLoc,
Douglas Gregorf35f8282009-11-11 21:54:23 +00003243 TempParm,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00003244 Converted,
3245 QualifierLoc);
Douglas Gregorf35f8282009-11-11 21:54:23 +00003246 if (Name.isNull())
3247 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003248
Douglas Gregorb6744ef2011-03-02 17:09:35 +00003249 Arg = TemplateArgumentLoc(TemplateArgument(Name), QualifierLoc,
3250 TempParm->getDefaultArgument().getTemplateNameLoc());
Douglas Gregorf35f8282009-11-11 21:54:23 +00003251 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003252
Douglas Gregorf35f8282009-11-11 21:54:23 +00003253 // Introduce an instantiation record that describes where we are using
3254 // the default template argument.
Richard Smith7e54fb52012-07-16 01:09:10 +00003255 InstantiatingTemplate Instantiating(*this, RAngleLoc, Template,
3256 *Param, Converted,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003257 SourceRange(TemplateLoc, RAngleLoc));
Richard Smithab91ef12012-07-08 02:38:24 +00003258 if (Instantiating)
3259 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003260
Douglas Gregorf35f8282009-11-11 21:54:23 +00003261 // Check the default template argument.
Douglas Gregord9e15302009-11-11 19:41:09 +00003262 if (CheckTemplateArgument(*Param, Arg, Template, TemplateLoc,
Douglas Gregor6952f1e2011-01-19 20:10:05 +00003263 RAngleLoc, 0, Converted))
Douglas Gregore7526412009-11-11 19:31:23 +00003264 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003265
Douglas Gregor67714232011-03-03 02:41:12 +00003266 // Core issue 150 (assumed resolution): if this is a template template
3267 // parameter, keep track of the default template arguments from the
3268 // template definition.
3269 if (isTemplateTemplateParameter)
3270 TemplateArgs.addArgument(Arg);
3271
Douglas Gregor14be16b2010-12-20 16:57:52 +00003272 // Move to the next template parameter and argument.
3273 ++Param;
3274 ++ArgIdx;
Douglas Gregorc15cb382009-02-09 23:23:08 +00003275 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003276
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003277 // If we have any leftover arguments, then there were too many arguments.
3278 // Complain and fail.
3279 if (ArgIdx < NumArgs)
3280 return diagnoseArityMismatch(*this, Template, TemplateLoc, TemplateArgs);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003281
Richard Smith6964b3f2012-09-07 02:06:42 +00003282 return false;
Douglas Gregorc15cb382009-02-09 23:23:08 +00003283}
3284
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003285namespace {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003286 class UnnamedLocalNoLinkageFinder
3287 : public TypeVisitor<UnnamedLocalNoLinkageFinder, bool>
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003288 {
3289 Sema &S;
3290 SourceRange SR;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003291
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003292 typedef TypeVisitor<UnnamedLocalNoLinkageFinder, bool> inherited;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003293
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003294 public:
3295 UnnamedLocalNoLinkageFinder(Sema &S, SourceRange SR) : S(S), SR(SR) { }
3296
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003297 bool Visit(QualType T) {
3298 return inherited::Visit(T.getTypePtr());
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003299 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003300
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003301#define TYPE(Class, Parent) \
3302 bool Visit##Class##Type(const Class##Type *);
3303#define ABSTRACT_TYPE(Class, Parent) \
3304 bool Visit##Class##Type(const Class##Type *) { return false; }
3305#define NON_CANONICAL_TYPE(Class, Parent) \
3306 bool Visit##Class##Type(const Class##Type *) { return false; }
3307#include "clang/AST/TypeNodes.def"
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003308
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003309 bool VisitTagDecl(const TagDecl *Tag);
3310 bool VisitNestedNameSpecifier(NestedNameSpecifier *NNS);
3311 };
3312}
3313
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003314bool UnnamedLocalNoLinkageFinder::VisitBuiltinType(const BuiltinType*) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003315 return false;
3316}
3317
3318bool UnnamedLocalNoLinkageFinder::VisitComplexType(const ComplexType* T) {
3319 return Visit(T->getElementType());
3320}
3321
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003322bool UnnamedLocalNoLinkageFinder::VisitPointerType(const PointerType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003323 return Visit(T->getPointeeType());
3324}
3325
3326bool UnnamedLocalNoLinkageFinder::VisitBlockPointerType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003327 const BlockPointerType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003328 return Visit(T->getPointeeType());
3329}
3330
3331bool UnnamedLocalNoLinkageFinder::VisitLValueReferenceType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003332 const LValueReferenceType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003333 return Visit(T->getPointeeType());
3334}
3335
3336bool UnnamedLocalNoLinkageFinder::VisitRValueReferenceType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003337 const RValueReferenceType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003338 return Visit(T->getPointeeType());
3339}
3340
3341bool UnnamedLocalNoLinkageFinder::VisitMemberPointerType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003342 const MemberPointerType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003343 return Visit(T->getPointeeType()) || Visit(QualType(T->getClass(), 0));
3344}
3345
3346bool UnnamedLocalNoLinkageFinder::VisitConstantArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003347 const ConstantArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003348 return Visit(T->getElementType());
3349}
3350
3351bool UnnamedLocalNoLinkageFinder::VisitIncompleteArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003352 const IncompleteArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003353 return Visit(T->getElementType());
3354}
3355
3356bool UnnamedLocalNoLinkageFinder::VisitVariableArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003357 const VariableArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003358 return Visit(T->getElementType());
3359}
3360
3361bool UnnamedLocalNoLinkageFinder::VisitDependentSizedArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003362 const DependentSizedArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003363 return Visit(T->getElementType());
3364}
3365
3366bool UnnamedLocalNoLinkageFinder::VisitDependentSizedExtVectorType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003367 const DependentSizedExtVectorType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003368 return Visit(T->getElementType());
3369}
3370
3371bool UnnamedLocalNoLinkageFinder::VisitVectorType(const VectorType* T) {
3372 return Visit(T->getElementType());
3373}
3374
3375bool UnnamedLocalNoLinkageFinder::VisitExtVectorType(const ExtVectorType* T) {
3376 return Visit(T->getElementType());
3377}
3378
3379bool UnnamedLocalNoLinkageFinder::VisitFunctionProtoType(
3380 const FunctionProtoType* T) {
3381 for (FunctionProtoType::arg_type_iterator A = T->arg_type_begin(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003382 AEnd = T->arg_type_end();
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003383 A != AEnd; ++A) {
3384 if (Visit(*A))
3385 return true;
3386 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003387
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003388 return Visit(T->getResultType());
3389}
3390
3391bool UnnamedLocalNoLinkageFinder::VisitFunctionNoProtoType(
3392 const FunctionNoProtoType* T) {
3393 return Visit(T->getResultType());
3394}
3395
3396bool UnnamedLocalNoLinkageFinder::VisitUnresolvedUsingType(
3397 const UnresolvedUsingType*) {
3398 return false;
3399}
3400
3401bool UnnamedLocalNoLinkageFinder::VisitTypeOfExprType(const TypeOfExprType*) {
3402 return false;
3403}
3404
3405bool UnnamedLocalNoLinkageFinder::VisitTypeOfType(const TypeOfType* T) {
3406 return Visit(T->getUnderlyingType());
3407}
3408
3409bool UnnamedLocalNoLinkageFinder::VisitDecltypeType(const DecltypeType*) {
3410 return false;
3411}
3412
Sean Huntca63c202011-05-24 22:41:36 +00003413bool UnnamedLocalNoLinkageFinder::VisitUnaryTransformType(
3414 const UnaryTransformType*) {
3415 return false;
3416}
3417
Richard Smith34b41d92011-02-20 03:19:35 +00003418bool UnnamedLocalNoLinkageFinder::VisitAutoType(const AutoType *T) {
3419 return Visit(T->getDeducedType());
3420}
3421
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003422bool UnnamedLocalNoLinkageFinder::VisitRecordType(const RecordType* T) {
3423 return VisitTagDecl(T->getDecl());
3424}
3425
3426bool UnnamedLocalNoLinkageFinder::VisitEnumType(const EnumType* T) {
3427 return VisitTagDecl(T->getDecl());
3428}
3429
3430bool UnnamedLocalNoLinkageFinder::VisitTemplateTypeParmType(
3431 const TemplateTypeParmType*) {
3432 return false;
3433}
3434
Douglas Gregorc3069d62011-01-14 02:55:32 +00003435bool UnnamedLocalNoLinkageFinder::VisitSubstTemplateTypeParmPackType(
3436 const SubstTemplateTypeParmPackType *) {
3437 return false;
3438}
3439
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003440bool UnnamedLocalNoLinkageFinder::VisitTemplateSpecializationType(
3441 const TemplateSpecializationType*) {
3442 return false;
3443}
3444
3445bool UnnamedLocalNoLinkageFinder::VisitInjectedClassNameType(
3446 const InjectedClassNameType* T) {
3447 return VisitTagDecl(T->getDecl());
3448}
3449
3450bool UnnamedLocalNoLinkageFinder::VisitDependentNameType(
3451 const DependentNameType* T) {
3452 return VisitNestedNameSpecifier(T->getQualifier());
3453}
3454
3455bool UnnamedLocalNoLinkageFinder::VisitDependentTemplateSpecializationType(
3456 const DependentTemplateSpecializationType* T) {
3457 return VisitNestedNameSpecifier(T->getQualifier());
3458}
3459
Douglas Gregor7536dd52010-12-20 02:24:11 +00003460bool UnnamedLocalNoLinkageFinder::VisitPackExpansionType(
3461 const PackExpansionType* T) {
3462 return Visit(T->getPattern());
3463}
3464
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003465bool UnnamedLocalNoLinkageFinder::VisitObjCObjectType(const ObjCObjectType *) {
3466 return false;
3467}
3468
3469bool UnnamedLocalNoLinkageFinder::VisitObjCInterfaceType(
3470 const ObjCInterfaceType *) {
3471 return false;
3472}
3473
3474bool UnnamedLocalNoLinkageFinder::VisitObjCObjectPointerType(
3475 const ObjCObjectPointerType *) {
3476 return false;
3477}
3478
Eli Friedmanb001de72011-10-06 23:00:33 +00003479bool UnnamedLocalNoLinkageFinder::VisitAtomicType(const AtomicType* T) {
3480 return Visit(T->getValueType());
3481}
3482
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003483bool UnnamedLocalNoLinkageFinder::VisitTagDecl(const TagDecl *Tag) {
3484 if (Tag->getDeclContext()->isFunctionOrMethod()) {
Richard Smithebaf0e62011-10-18 20:49:44 +00003485 S.Diag(SR.getBegin(),
Richard Smith80ad52f2013-01-02 11:42:31 +00003486 S.getLangOpts().CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00003487 diag::warn_cxx98_compat_template_arg_local_type :
3488 diag::ext_template_arg_local_type)
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003489 << S.Context.getTypeDeclType(Tag) << SR;
3490 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003491 }
3492
John McCall83972f12013-03-09 00:54:27 +00003493 if (!Tag->hasNameForLinkage()) {
Richard Smithebaf0e62011-10-18 20:49:44 +00003494 S.Diag(SR.getBegin(),
Richard Smith80ad52f2013-01-02 11:42:31 +00003495 S.getLangOpts().CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00003496 diag::warn_cxx98_compat_template_arg_unnamed_type :
3497 diag::ext_template_arg_unnamed_type) << SR;
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003498 S.Diag(Tag->getLocation(), diag::note_template_unnamed_type_here);
3499 return true;
3500 }
3501
3502 return false;
3503}
3504
3505bool UnnamedLocalNoLinkageFinder::VisitNestedNameSpecifier(
3506 NestedNameSpecifier *NNS) {
3507 if (NNS->getPrefix() && VisitNestedNameSpecifier(NNS->getPrefix()))
3508 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003509
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003510 switch (NNS->getKind()) {
3511 case NestedNameSpecifier::Identifier:
3512 case NestedNameSpecifier::Namespace:
Douglas Gregor14aba762011-02-24 02:36:08 +00003513 case NestedNameSpecifier::NamespaceAlias:
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003514 case NestedNameSpecifier::Global:
3515 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003516
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003517 case NestedNameSpecifier::TypeSpec:
3518 case NestedNameSpecifier::TypeSpecWithTemplate:
3519 return Visit(QualType(NNS->getAsType(), 0));
3520 }
David Blaikie7530c032012-01-17 06:56:22 +00003521 llvm_unreachable("Invalid NestedNameSpecifier::Kind!");
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003522}
3523
3524
Douglas Gregorc15cb382009-02-09 23:23:08 +00003525/// \brief Check a template argument against its corresponding
3526/// template type parameter.
3527///
3528/// This routine implements the semantics of C++ [temp.arg.type]. It
3529/// returns true if an error occurred, and false otherwise.
Mike Stump1eb44332009-09-09 15:08:12 +00003530bool Sema::CheckTemplateArgument(TemplateTypeParmDecl *Param,
John McCalla93c9342009-12-07 02:54:59 +00003531 TypeSourceInfo *ArgInfo) {
3532 assert(ArgInfo && "invalid TypeSourceInfo");
John McCall833ca992009-10-29 08:12:44 +00003533 QualType Arg = ArgInfo->getType();
Douglas Gregor0fddb972010-05-22 16:17:30 +00003534 SourceRange SR = ArgInfo->getTypeLoc().getSourceRange();
Chandler Carruth17fb8552010-09-03 21:12:34 +00003535
3536 if (Arg->isVariablyModifiedType()) {
3537 return Diag(SR.getBegin(), diag::err_variably_modified_template_arg) << Arg;
Douglas Gregor4b52e252009-12-21 23:17:24 +00003538 } else if (Context.hasSameUnqualifiedType(Arg, Context.OverloadTy)) {
Douglas Gregor4b52e252009-12-21 23:17:24 +00003539 return Diag(SR.getBegin(), diag::err_template_arg_overload_type) << SR;
Douglas Gregorc15cb382009-02-09 23:23:08 +00003540 }
3541
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003542 // C++03 [temp.arg.type]p2:
3543 // A local type, a type with no linkage, an unnamed type or a type
3544 // compounded from any of these types shall not be used as a
3545 // template-argument for a template type-parameter.
3546 //
Richard Smithebaf0e62011-10-18 20:49:44 +00003547 // C++11 allows these, and even in C++03 we allow them as an extension with
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003548 // a warning.
Richard Smith80ad52f2013-01-02 11:42:31 +00003549 if (LangOpts.CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00003550 Diags.getDiagnosticLevel(diag::warn_cxx98_compat_template_arg_unnamed_type,
3551 SR.getBegin()) != DiagnosticsEngine::Ignored ||
3552 Diags.getDiagnosticLevel(diag::warn_cxx98_compat_template_arg_local_type,
3553 SR.getBegin()) != DiagnosticsEngine::Ignored :
3554 Arg->hasUnnamedOrLocalType()) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003555 UnnamedLocalNoLinkageFinder Finder(*this, SR);
3556 (void)Finder.Visit(Context.getCanonicalType(Arg));
3557 }
3558
Douglas Gregorc15cb382009-02-09 23:23:08 +00003559 return false;
3560}
3561
Douglas Gregor42963612012-04-10 17:08:25 +00003562enum NullPointerValueKind {
3563 NPV_NotNullPointer,
3564 NPV_NullPointer,
3565 NPV_Error
3566};
3567
3568/// \brief Determine whether the given template argument is a null pointer
3569/// value of the appropriate type.
3570static NullPointerValueKind
3571isNullPointerValueTemplateArgument(Sema &S, NonTypeTemplateParmDecl *Param,
3572 QualType ParamType, Expr *Arg) {
3573 if (Arg->isValueDependent() || Arg->isTypeDependent())
3574 return NPV_NotNullPointer;
3575
Richard Smith80ad52f2013-01-02 11:42:31 +00003576 if (!S.getLangOpts().CPlusPlus11)
Douglas Gregor42963612012-04-10 17:08:25 +00003577 return NPV_NotNullPointer;
3578
3579 // Determine whether we have a constant expression.
Douglas Gregor50fadd12012-04-10 19:03:30 +00003580 ExprResult ArgRV = S.DefaultFunctionArrayConversion(Arg);
3581 if (ArgRV.isInvalid())
3582 return NPV_Error;
3583 Arg = ArgRV.take();
3584
Douglas Gregor42963612012-04-10 17:08:25 +00003585 Expr::EvalResult EvalResult;
Dmitri Gribenkocfa88f82013-01-12 19:30:44 +00003586 SmallVector<PartialDiagnosticAt, 8> Notes;
Douglas Gregor50fadd12012-04-10 19:03:30 +00003587 EvalResult.Diag = &Notes;
Douglas Gregor42963612012-04-10 17:08:25 +00003588 if (!Arg->EvaluateAsRValue(EvalResult, S.Context) ||
Douglas Gregor50fadd12012-04-10 19:03:30 +00003589 EvalResult.HasSideEffects) {
3590 SourceLocation DiagLoc = Arg->getExprLoc();
3591
3592 // If our only note is the usual "invalid subexpression" note, just point
3593 // the caret at its location rather than producing an essentially
3594 // redundant note.
3595 if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
3596 diag::note_invalid_subexpr_in_const_expr) {
3597 DiagLoc = Notes[0].first;
3598 Notes.clear();
3599 }
3600
3601 S.Diag(DiagLoc, diag::err_template_arg_not_address_constant)
3602 << Arg->getType() << Arg->getSourceRange();
3603 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
3604 S.Diag(Notes[I].first, Notes[I].second);
3605
3606 S.Diag(Param->getLocation(), diag::note_template_param_here);
3607 return NPV_Error;
3608 }
Douglas Gregor42963612012-04-10 17:08:25 +00003609
3610 // C++11 [temp.arg.nontype]p1:
3611 // - an address constant expression of type std::nullptr_t
3612 if (Arg->getType()->isNullPtrType())
3613 return NPV_NullPointer;
3614
3615 // - a constant expression that evaluates to a null pointer value (4.10); or
3616 // - a constant expression that evaluates to a null member pointer value
3617 // (4.11); or
3618 if ((EvalResult.Val.isLValue() && !EvalResult.Val.getLValueBase()) ||
3619 (EvalResult.Val.isMemberPointer() &&
3620 !EvalResult.Val.getMemberPointerDecl())) {
3621 // If our expression has an appropriate type, we've succeeded.
3622 bool ObjCLifetimeConversion;
3623 if (S.Context.hasSameUnqualifiedType(Arg->getType(), ParamType) ||
3624 S.IsQualificationConversion(Arg->getType(), ParamType, false,
3625 ObjCLifetimeConversion))
3626 return NPV_NullPointer;
3627
3628 // The types didn't match, but we know we got a null pointer; complain,
3629 // then recover as if the types were correct.
3630 S.Diag(Arg->getExprLoc(), diag::err_template_arg_wrongtype_null_constant)
3631 << Arg->getType() << ParamType << Arg->getSourceRange();
3632 S.Diag(Param->getLocation(), diag::note_template_param_here);
3633 return NPV_NullPointer;
3634 }
3635
3636 // If we don't have a null pointer value, but we do have a NULL pointer
3637 // constant, suggest a cast to the appropriate type.
3638 if (Arg->isNullPointerConstant(S.Context, Expr::NPC_NeverValueDependent)) {
3639 std::string Code = "static_cast<" + ParamType.getAsString() + ">(";
3640 S.Diag(Arg->getExprLoc(), diag::err_template_arg_untyped_null_constant)
3641 << ParamType
3642 << FixItHint::CreateInsertion(Arg->getLocStart(), Code)
3643 << FixItHint::CreateInsertion(S.PP.getLocForEndOfToken(Arg->getLocEnd()),
3644 ")");
3645 S.Diag(Param->getLocation(), diag::note_template_param_here);
3646 return NPV_NullPointer;
3647 }
3648
3649 // FIXME: If we ever want to support general, address-constant expressions
3650 // as non-type template arguments, we should return the ExprResult here to
3651 // be interpreted by the caller.
3652 return NPV_NotNullPointer;
3653}
3654
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003655/// \brief Checks whether the given template argument is the address
3656/// of an object or function according to C++ [temp.arg.nontype]p1.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003657static bool
Douglas Gregorb7a09262010-04-01 18:32:35 +00003658CheckTemplateArgumentAddressOfObjectOrFunction(Sema &S,
3659 NonTypeTemplateParmDecl *Param,
3660 QualType ParamType,
3661 Expr *ArgIn,
3662 TemplateArgument &Converted) {
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003663 bool Invalid = false;
Douglas Gregorb7a09262010-04-01 18:32:35 +00003664 Expr *Arg = ArgIn;
3665 QualType ArgType = Arg->getType();
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003666
Douglas Gregor42963612012-04-10 17:08:25 +00003667 // If our parameter has pointer type, check for a null template value.
3668 if (ParamType->isPointerType() || ParamType->isNullPtrType()) {
3669 switch (isNullPointerValueTemplateArgument(S, Param, ParamType, Arg)) {
3670 case NPV_NullPointer:
Richard Smith86e6fdc2012-04-26 01:51:03 +00003671 S.Diag(Arg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null);
Eli Friedmand7a6b162012-09-26 02:36:12 +00003672 Converted = TemplateArgument(ParamType, /*isNullPtr*/true);
Douglas Gregor42963612012-04-10 17:08:25 +00003673 return false;
3674
3675 case NPV_Error:
3676 return true;
3677
3678 case NPV_NotNullPointer:
3679 break;
3680 }
3681 }
3682
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003683 // See through any implicit casts we added to fix the type.
John McCall91a57552011-07-15 05:09:51 +00003684 Arg = Arg->IgnoreImpCasts();
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003685
3686 // C++ [temp.arg.nontype]p1:
Mike Stump1eb44332009-09-09 15:08:12 +00003687 //
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003688 // A template-argument for a non-type, non-template
3689 // template-parameter shall be one of: [...]
3690 //
3691 // -- the address of an object or function with external
3692 // linkage, including function templates and function
3693 // template-ids but excluding non-static class members,
3694 // expressed as & id-expression where the & is optional if
3695 // the name refers to a function or array, or if the
3696 // corresponding template-parameter is a reference; or
Mike Stump1eb44332009-09-09 15:08:12 +00003697
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00003698 // In C++98/03 mode, give an extension warning on any extra parentheses.
3699 // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773
3700 bool ExtraParens = false;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003701 while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) {
Richard Smithebaf0e62011-10-18 20:49:44 +00003702 if (!Invalid && !ExtraParens) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00003703 S.Diag(Arg->getLocStart(),
Richard Smith80ad52f2013-01-02 11:42:31 +00003704 S.getLangOpts().CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00003705 diag::warn_cxx98_compat_template_arg_extra_parens :
3706 diag::ext_template_arg_extra_parens)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003707 << Arg->getSourceRange();
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00003708 ExtraParens = true;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003709 }
3710
3711 Arg = Parens->getSubExpr();
3712 }
3713
John McCall91a57552011-07-15 05:09:51 +00003714 while (SubstNonTypeTemplateParmExpr *subst =
3715 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
3716 Arg = subst->getReplacement()->IgnoreImpCasts();
3717
Douglas Gregorb7a09262010-04-01 18:32:35 +00003718 bool AddressTaken = false;
3719 SourceLocation AddrOpLoc;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003720 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
John McCall2de56d12010-08-25 11:45:40 +00003721 if (UnOp->getOpcode() == UO_AddrOf) {
John McCall91a57552011-07-15 05:09:51 +00003722 Arg = UnOp->getSubExpr();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003723 AddressTaken = true;
3724 AddrOpLoc = UnOp->getOperatorLoc();
3725 }
Francois Picheta343a412011-04-29 09:08:14 +00003726 }
John McCall91a57552011-07-15 05:09:51 +00003727
Eli Friedman2e236fb2013-06-27 21:20:28 +00003728 if (isa<CXXUuidofExpr>(Arg)) {
John McCall91a57552011-07-15 05:09:51 +00003729 Converted = TemplateArgument(ArgIn);
3730 return false;
3731 }
3732
3733 while (SubstNonTypeTemplateParmExpr *subst =
3734 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
3735 Arg = subst->getReplacement()->IgnoreImpCasts();
3736
Chandler Carruth038cc392010-01-31 10:01:20 +00003737 // Stop checking the precise nature of the argument if it is value dependent,
3738 // it should be checked when instantiated.
Douglas Gregorb7a09262010-04-01 18:32:35 +00003739 if (Arg->isValueDependent()) {
John McCall3fa5cae2010-10-26 07:05:15 +00003740 Converted = TemplateArgument(ArgIn);
Chandler Carruth038cc392010-01-31 10:01:20 +00003741 return false;
Douglas Gregorb7a09262010-04-01 18:32:35 +00003742 }
Douglas Gregord2008e22012-04-06 22:40:38 +00003743
3744 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg);
3745 if (!DRE) {
3746 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_decl_ref)
3747 << Arg->getSourceRange();
3748 S.Diag(Param->getLocation(), diag::note_template_param_here);
3749 return true;
3750 }
Chandler Carruth038cc392010-01-31 10:01:20 +00003751
Douglas Gregorb7a09262010-04-01 18:32:35 +00003752 if (!isa<ValueDecl>(DRE->getDecl())) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00003753 S.Diag(Arg->getLocStart(),
Douglas Gregorb7a09262010-04-01 18:32:35 +00003754 diag::err_template_arg_not_object_or_func_form)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003755 << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003756 S.Diag(Param->getLocation(), diag::note_template_param_here);
3757 return true;
3758 }
3759
Eli Friedmand7a6b162012-09-26 02:36:12 +00003760 ValueDecl *Entity = DRE->getDecl();
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003761
3762 // Cannot refer to non-static data members
Richard Smithb4051e72012-04-04 21:11:30 +00003763 if (FieldDecl *Field = dyn_cast<FieldDecl>(Entity)) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00003764 S.Diag(Arg->getLocStart(), diag::err_template_arg_field)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003765 << Field << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003766 S.Diag(Param->getLocation(), diag::note_template_param_here);
3767 return true;
3768 }
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003769
3770 // Cannot refer to non-static member functions
Richard Smithb4051e72012-04-04 21:11:30 +00003771 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Entity)) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00003772 if (!Method->isStatic()) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00003773 S.Diag(Arg->getLocStart(), diag::err_template_arg_method)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003774 << Method << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003775 S.Diag(Param->getLocation(), diag::note_template_param_here);
3776 return true;
3777 }
Richard Smithb4051e72012-04-04 21:11:30 +00003778 }
Mike Stump1eb44332009-09-09 15:08:12 +00003779
Richard Smithb4051e72012-04-04 21:11:30 +00003780 FunctionDecl *Func = dyn_cast<FunctionDecl>(Entity);
3781 VarDecl *Var = dyn_cast<VarDecl>(Entity);
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003782
Richard Smithb4051e72012-04-04 21:11:30 +00003783 // A non-type template argument must refer to an object or function.
3784 if (!Func && !Var) {
3785 // We found something, but we don't know specifically what it is.
3786 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_object_or_func)
3787 << Arg->getSourceRange();
3788 S.Diag(DRE->getDecl()->getLocation(), diag::note_template_arg_refers_here);
3789 return true;
3790 }
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003791
Richard Smithb4051e72012-04-04 21:11:30 +00003792 // Address / reference template args must have external linkage in C++98.
Rafael Espindola181e3ec2013-05-13 00:12:11 +00003793 if (Entity->getFormalLinkage() == InternalLinkage) {
Richard Smith80ad52f2013-01-02 11:42:31 +00003794 S.Diag(Arg->getLocStart(), S.getLangOpts().CPlusPlus11 ?
Richard Smithb4051e72012-04-04 21:11:30 +00003795 diag::warn_cxx98_compat_template_arg_object_internal :
3796 diag::ext_template_arg_object_internal)
3797 << !Func << Entity << Arg->getSourceRange();
3798 S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object)
3799 << !Func;
Rafael Espindola181e3ec2013-05-13 00:12:11 +00003800 } else if (!Entity->hasLinkage()) {
Richard Smithb4051e72012-04-04 21:11:30 +00003801 S.Diag(Arg->getLocStart(), diag::err_template_arg_object_no_linkage)
3802 << !Func << Entity << Arg->getSourceRange();
3803 S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object)
3804 << !Func;
3805 return true;
3806 }
3807
3808 if (Func) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00003809 // If the template parameter has pointer type, the function decays.
3810 if (ParamType->isPointerType() && !AddressTaken)
3811 ArgType = S.Context.getPointerType(Func->getType());
3812 else if (AddressTaken && ParamType->isReferenceType()) {
3813 // If we originally had an address-of operator, but the
3814 // parameter has reference type, complain and (if things look
3815 // like they will work) drop the address-of operator.
3816 if (!S.Context.hasSameUnqualifiedType(Func->getType(),
3817 ParamType.getNonReferenceType())) {
3818 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
3819 << ParamType;
3820 S.Diag(Param->getLocation(), diag::note_template_param_here);
3821 return true;
3822 }
3823
3824 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
3825 << ParamType
3826 << FixItHint::CreateRemoval(AddrOpLoc);
3827 S.Diag(Param->getLocation(), diag::note_template_param_here);
3828
3829 ArgType = Func->getType();
3830 }
Richard Smithb4051e72012-04-04 21:11:30 +00003831 } else {
Douglas Gregorb7a09262010-04-01 18:32:35 +00003832 // A value of reference type is not an object.
3833 if (Var->getType()->isReferenceType()) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00003834 S.Diag(Arg->getLocStart(),
Douglas Gregorb7a09262010-04-01 18:32:35 +00003835 diag::err_template_arg_reference_var)
3836 << Var->getType() << Arg->getSourceRange();
3837 S.Diag(Param->getLocation(), diag::note_template_param_here);
3838 return true;
3839 }
3840
Richard Smithb4051e72012-04-04 21:11:30 +00003841 // A template argument must have static storage duration.
Richard Smith38afbc72013-04-13 02:43:54 +00003842 if (Var->getTLSKind()) {
Richard Smithb4051e72012-04-04 21:11:30 +00003843 S.Diag(Arg->getLocStart(), diag::err_template_arg_thread_local)
3844 << Arg->getSourceRange();
3845 S.Diag(Var->getLocation(), diag::note_template_arg_refers_here);
3846 return true;
3847 }
Douglas Gregorb7a09262010-04-01 18:32:35 +00003848
3849 // If the template parameter has pointer type, we must have taken
3850 // the address of this object.
3851 if (ParamType->isReferenceType()) {
3852 if (AddressTaken) {
3853 // If we originally had an address-of operator, but the
3854 // parameter has reference type, complain and (if things look
3855 // like they will work) drop the address-of operator.
3856 if (!S.Context.hasSameUnqualifiedType(Var->getType(),
3857 ParamType.getNonReferenceType())) {
3858 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
3859 << ParamType;
3860 S.Diag(Param->getLocation(), diag::note_template_param_here);
3861 return true;
3862 }
3863
3864 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
3865 << ParamType
3866 << FixItHint::CreateRemoval(AddrOpLoc);
3867 S.Diag(Param->getLocation(), diag::note_template_param_here);
3868
3869 ArgType = Var->getType();
3870 }
3871 } else if (!AddressTaken && ParamType->isPointerType()) {
3872 if (Var->getType()->isArrayType()) {
3873 // Array-to-pointer decay.
3874 ArgType = S.Context.getArrayDecayedType(Var->getType());
3875 } else {
3876 // If the template parameter has pointer type but the address of
3877 // this object was not taken, complain and (possibly) recover by
3878 // taking the address of the entity.
3879 ArgType = S.Context.getPointerType(Var->getType());
3880 if (!S.Context.hasSameUnqualifiedType(ArgType, ParamType)) {
3881 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_address_of)
3882 << ParamType;
3883 S.Diag(Param->getLocation(), diag::note_template_param_here);
3884 return true;
3885 }
3886
3887 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_address_of)
3888 << ParamType
3889 << FixItHint::CreateInsertion(Arg->getLocStart(), "&");
3890
3891 S.Diag(Param->getLocation(), diag::note_template_param_here);
3892 }
3893 }
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003894 }
Mike Stump1eb44332009-09-09 15:08:12 +00003895
John McCallf85e1932011-06-15 23:02:42 +00003896 bool ObjCLifetimeConversion;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003897 if (ParamType->isPointerType() &&
Douglas Gregorb7a09262010-04-01 18:32:35 +00003898 !ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType() &&
John McCallf85e1932011-06-15 23:02:42 +00003899 S.IsQualificationConversion(ArgType, ParamType, false,
3900 ObjCLifetimeConversion)) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00003901 // For pointer-to-object types, qualification conversions are
3902 // permitted.
3903 } else {
3904 if (const ReferenceType *ParamRef = ParamType->getAs<ReferenceType>()) {
3905 if (!ParamRef->getPointeeType()->isFunctionType()) {
3906 // C++ [temp.arg.nontype]p5b3:
3907 // For a non-type template-parameter of type reference to
3908 // object, no conversions apply. The type referred to by the
3909 // reference may be more cv-qualified than the (otherwise
3910 // identical) type of the template- argument. The
3911 // template-parameter is bound directly to the
3912 // template-argument, which shall be an lvalue.
3913
3914 // FIXME: Other qualifiers?
3915 unsigned ParamQuals = ParamRef->getPointeeType().getCVRQualifiers();
3916 unsigned ArgQuals = ArgType.getCVRQualifiers();
3917
3918 if ((ParamQuals | ArgQuals) != ParamQuals) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00003919 S.Diag(Arg->getLocStart(),
Douglas Gregorb7a09262010-04-01 18:32:35 +00003920 diag::err_template_arg_ref_bind_ignores_quals)
3921 << ParamType << Arg->getType()
3922 << Arg->getSourceRange();
3923 S.Diag(Param->getLocation(), diag::note_template_param_here);
3924 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003925 }
Douglas Gregorb7a09262010-04-01 18:32:35 +00003926 }
3927 }
3928
3929 // At this point, the template argument refers to an object or
3930 // function with external linkage. We now need to check whether the
3931 // argument and parameter types are compatible.
3932 if (!S.Context.hasSameUnqualifiedType(ArgType,
3933 ParamType.getNonReferenceType())) {
3934 // We can't perform this conversion or binding.
3935 if (ParamType->isReferenceType())
3936 S.Diag(Arg->getLocStart(), diag::err_template_arg_no_ref_bind)
John McCall91a57552011-07-15 05:09:51 +00003937 << ParamType << ArgIn->getType() << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003938 else
3939 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_convertible)
John McCall91a57552011-07-15 05:09:51 +00003940 << ArgIn->getType() << ParamType << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003941 S.Diag(Param->getLocation(), diag::note_template_param_here);
3942 return true;
3943 }
3944 }
3945
3946 // Create the template argument.
Eli Friedmand7a6b162012-09-26 02:36:12 +00003947 Converted = TemplateArgument(cast<ValueDecl>(Entity->getCanonicalDecl()),
3948 ParamType->isReferenceType());
Nick Lewyckyb7e5eec2013-02-02 00:25:55 +00003949 S.MarkAnyDeclReferenced(Arg->getLocStart(), Entity, false);
Douglas Gregorb7a09262010-04-01 18:32:35 +00003950 return false;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003951}
3952
3953/// \brief Checks whether the given template argument is a pointer to
3954/// member constant according to C++ [temp.arg.nontype]p1.
Douglas Gregor42963612012-04-10 17:08:25 +00003955static bool CheckTemplateArgumentPointerToMember(Sema &S,
3956 NonTypeTemplateParmDecl *Param,
3957 QualType ParamType,
3958 Expr *&ResultArg,
3959 TemplateArgument &Converted) {
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003960 bool Invalid = false;
3961
Douglas Gregor42963612012-04-10 17:08:25 +00003962 // Check for a null pointer value.
3963 Expr *Arg = ResultArg;
3964 switch (isNullPointerValueTemplateArgument(S, Param, ParamType, Arg)) {
3965 case NPV_Error:
3966 return true;
3967 case NPV_NullPointer:
Richard Smith86e6fdc2012-04-26 01:51:03 +00003968 S.Diag(Arg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null);
Eli Friedmand7a6b162012-09-26 02:36:12 +00003969 Converted = TemplateArgument(ParamType, /*isNullPtr*/true);
Douglas Gregor42963612012-04-10 17:08:25 +00003970 return false;
3971 case NPV_NotNullPointer:
3972 break;
3973 }
3974
3975 bool ObjCLifetimeConversion;
3976 if (S.IsQualificationConversion(Arg->getType(),
3977 ParamType.getNonReferenceType(),
3978 false, ObjCLifetimeConversion)) {
3979 Arg = S.ImpCastExprToType(Arg, ParamType, CK_NoOp,
3980 Arg->getValueKind()).take();
3981 ResultArg = Arg;
3982 } else if (!S.Context.hasSameUnqualifiedType(Arg->getType(),
3983 ParamType.getNonReferenceType())) {
3984 // We can't perform this conversion.
3985 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_convertible)
3986 << Arg->getType() << ParamType << Arg->getSourceRange();
3987 S.Diag(Param->getLocation(), diag::note_template_param_here);
3988 return true;
3989 }
3990
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003991 // See through any implicit casts we added to fix the type.
Eli Friedman73c39ab2009-10-20 08:27:19 +00003992 while (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg))
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003993 Arg = Cast->getSubExpr();
3994
3995 // C++ [temp.arg.nontype]p1:
Mike Stump1eb44332009-09-09 15:08:12 +00003996 //
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003997 // A template-argument for a non-type, non-template
3998 // template-parameter shall be one of: [...]
3999 //
4000 // -- a pointer to member expressed as described in 5.3.1.
Douglas Gregora2813ce2009-10-23 18:54:35 +00004001 DeclRefExpr *DRE = 0;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004002
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00004003 // In C++98/03 mode, give an extension warning on any extra parentheses.
4004 // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773
4005 bool ExtraParens = false;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004006 while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) {
Richard Smithebaf0e62011-10-18 20:49:44 +00004007 if (!Invalid && !ExtraParens) {
Douglas Gregor42963612012-04-10 17:08:25 +00004008 S.Diag(Arg->getLocStart(),
Richard Smith80ad52f2013-01-02 11:42:31 +00004009 S.getLangOpts().CPlusPlus11 ?
Douglas Gregor42963612012-04-10 17:08:25 +00004010 diag::warn_cxx98_compat_template_arg_extra_parens :
4011 diag::ext_template_arg_extra_parens)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004012 << Arg->getSourceRange();
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00004013 ExtraParens = true;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004014 }
4015
4016 Arg = Parens->getSubExpr();
4017 }
4018
John McCall91a57552011-07-15 05:09:51 +00004019 while (SubstNonTypeTemplateParmExpr *subst =
4020 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
4021 Arg = subst->getReplacement()->IgnoreImpCasts();
4022
Douglas Gregorcaddba02009-11-12 18:38:13 +00004023 // A pointer-to-member constant written &Class::member.
4024 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
John McCall2de56d12010-08-25 11:45:40 +00004025 if (UnOp->getOpcode() == UO_AddrOf) {
Douglas Gregora2813ce2009-10-23 18:54:35 +00004026 DRE = dyn_cast<DeclRefExpr>(UnOp->getSubExpr());
4027 if (DRE && !DRE->getQualifier())
4028 DRE = 0;
4029 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004030 }
Douglas Gregorcaddba02009-11-12 18:38:13 +00004031 // A constant of pointer-to-member type.
4032 else if ((DRE = dyn_cast<DeclRefExpr>(Arg))) {
4033 if (ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) {
4034 if (VD->getType()->isMemberPointerType()) {
4035 if (isa<NonTypeTemplateParmDecl>(VD) ||
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004036 (isa<VarDecl>(VD) &&
Douglas Gregor42963612012-04-10 17:08:25 +00004037 S.Context.getCanonicalType(VD->getType()).isConstQualified())) {
Eli Friedmand7a6b162012-09-26 02:36:12 +00004038 if (Arg->isTypeDependent() || Arg->isValueDependent()) {
John McCall3fa5cae2010-10-26 07:05:15 +00004039 Converted = TemplateArgument(Arg);
Eli Friedmand7a6b162012-09-26 02:36:12 +00004040 } else {
4041 VD = cast<ValueDecl>(VD->getCanonicalDecl());
4042 Converted = TemplateArgument(VD, /*isReferenceParam*/false);
4043 }
Douglas Gregorcaddba02009-11-12 18:38:13 +00004044 return Invalid;
4045 }
4046 }
4047 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004048
Douglas Gregorcaddba02009-11-12 18:38:13 +00004049 DRE = 0;
4050 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004051
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004052 if (!DRE)
Douglas Gregor42963612012-04-10 17:08:25 +00004053 return S.Diag(Arg->getLocStart(),
4054 diag::err_template_arg_not_pointer_to_member_form)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004055 << Arg->getSourceRange();
4056
4057 if (isa<FieldDecl>(DRE->getDecl()) || isa<CXXMethodDecl>(DRE->getDecl())) {
4058 assert((isa<FieldDecl>(DRE->getDecl()) ||
4059 !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) &&
4060 "Only non-static member pointers can make it here");
4061
4062 // Okay: this is the address of a non-static member, and therefore
4063 // a member pointer constant.
Eli Friedmand7a6b162012-09-26 02:36:12 +00004064 if (Arg->isTypeDependent() || Arg->isValueDependent()) {
John McCall3fa5cae2010-10-26 07:05:15 +00004065 Converted = TemplateArgument(Arg);
Eli Friedmand7a6b162012-09-26 02:36:12 +00004066 } else {
4067 ValueDecl *D = cast<ValueDecl>(DRE->getDecl()->getCanonicalDecl());
4068 Converted = TemplateArgument(D, /*isReferenceParam*/false);
4069 }
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004070 return Invalid;
4071 }
4072
4073 // We found something else, but we don't know specifically what it is.
Douglas Gregor42963612012-04-10 17:08:25 +00004074 S.Diag(Arg->getLocStart(),
4075 diag::err_template_arg_not_pointer_to_member_form)
4076 << Arg->getSourceRange();
4077 S.Diag(DRE->getDecl()->getLocation(), diag::note_template_arg_refers_here);
Douglas Gregorcc45cb32009-02-11 19:52:55 +00004078 return true;
4079}
4080
Douglas Gregorc15cb382009-02-09 23:23:08 +00004081/// \brief Check a template argument against its corresponding
4082/// non-type template parameter.
4083///
Douglas Gregor2943aed2009-03-03 04:44:36 +00004084/// This routine implements the semantics of C++ [temp.arg.nontype].
John Wiegley429bb272011-04-08 18:41:53 +00004085/// If an error occurred, it returns ExprError(); otherwise, it
4086/// returns the converted template argument. \p
Douglas Gregor2943aed2009-03-03 04:44:36 +00004087/// InstantiatedParamType is the type of the non-type template
4088/// parameter after it has been instantiated.
John Wiegley429bb272011-04-08 18:41:53 +00004089ExprResult Sema::CheckTemplateArgument(NonTypeTemplateParmDecl *Param,
4090 QualType InstantiatedParamType, Expr *Arg,
4091 TemplateArgument &Converted,
4092 CheckTemplateArgumentKind CTAK) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004093 SourceLocation StartLoc = Arg->getLocStart();
Douglas Gregor40808ce2009-03-09 23:48:35 +00004094
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004095 // If either the parameter has a dependent type or the argument is
4096 // type-dependent, there's nothing we can check now.
Douglas Gregor40808ce2009-03-09 23:48:35 +00004097 if (InstantiatedParamType->isDependentType() || Arg->isTypeDependent()) {
4098 // FIXME: Produce a cloned, canonical expression?
Douglas Gregor02cbbd22009-06-11 18:10:32 +00004099 Converted = TemplateArgument(Arg);
John Wiegley429bb272011-04-08 18:41:53 +00004100 return Owned(Arg);
Douglas Gregor40808ce2009-03-09 23:48:35 +00004101 }
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004102
4103 // C++ [temp.arg.nontype]p5:
4104 // The following conversions are performed on each expression used
4105 // as a non-type template-argument. If a non-type
4106 // template-argument cannot be converted to the type of the
4107 // corresponding template-parameter then the program is
4108 // ill-formed.
Douglas Gregor2943aed2009-03-03 04:44:36 +00004109 QualType ParamType = InstantiatedParamType;
Douglas Gregor2ade35e2010-06-16 00:17:44 +00004110 if (ParamType->isIntegralOrEnumerationType()) {
Richard Smith8ef7b202012-01-18 23:55:52 +00004111 // C++11:
4112 // -- for a non-type template-parameter of integral or
4113 // enumeration type, conversions permitted in a converted
4114 // constant expression are applied.
4115 //
4116 // C++98:
4117 // -- for a non-type template-parameter of integral or
4118 // enumeration type, integral promotions (4.5) and integral
4119 // conversions (4.7) are applied.
4120
4121 if (CTAK == CTAK_Deduced &&
4122 !Context.hasSameUnqualifiedType(ParamType, Arg->getType())) {
4123 // C++ [temp.deduct.type]p17:
4124 // If, in the declaration of a function template with a non-type
4125 // template-parameter, the non-type template-parameter is used
4126 // in an expression in the function parameter-list and, if the
4127 // corresponding template-argument is deduced, the
4128 // template-argument type shall match the type of the
4129 // template-parameter exactly, except that a template-argument
4130 // deduced from an array bound may be of any integral type.
4131 Diag(StartLoc, diag::err_deduced_non_type_template_arg_type_mismatch)
4132 << Arg->getType().getUnqualifiedType()
4133 << ParamType.getUnqualifiedType();
4134 Diag(Param->getLocation(), diag::note_template_param_here);
4135 return ExprError();
4136 }
4137
Richard Smith80ad52f2013-01-02 11:42:31 +00004138 if (getLangOpts().CPlusPlus11) {
Richard Smith8ef7b202012-01-18 23:55:52 +00004139 // We can't check arbitrary value-dependent arguments.
4140 // FIXME: If there's no viable conversion to the template parameter type,
4141 // we should be able to diagnose that prior to instantiation.
4142 if (Arg->isValueDependent()) {
4143 Converted = TemplateArgument(Arg);
4144 return Owned(Arg);
4145 }
4146
4147 // C++ [temp.arg.nontype]p1:
4148 // A template-argument for a non-type, non-template template-parameter
4149 // shall be one of:
4150 //
4151 // -- for a non-type template-parameter of integral or enumeration
4152 // type, a converted constant expression of the type of the
4153 // template-parameter; or
4154 llvm::APSInt Value;
4155 ExprResult ArgResult =
4156 CheckConvertedConstantExpression(Arg, ParamType, Value,
4157 CCEK_TemplateArg);
4158 if (ArgResult.isInvalid())
4159 return ExprError();
4160
4161 // Widen the argument value to sizeof(parameter type). This is almost
4162 // always a no-op, except when the parameter type is bool. In
4163 // that case, this may extend the argument from 1 bit to 8 bits.
4164 QualType IntegerType = ParamType;
4165 if (const EnumType *Enum = IntegerType->getAs<EnumType>())
4166 IntegerType = Enum->getDecl()->getIntegerType();
4167 Value = Value.extOrTrunc(Context.getTypeSize(IntegerType));
4168
Benjamin Kramer85524372012-06-07 15:09:51 +00004169 Converted = TemplateArgument(Context, Value,
4170 Context.getCanonicalType(ParamType));
Richard Smith8ef7b202012-01-18 23:55:52 +00004171 return ArgResult;
4172 }
4173
Richard Smith4f870622011-10-27 22:11:44 +00004174 ExprResult ArgResult = DefaultLvalueConversion(Arg);
4175 if (ArgResult.isInvalid())
4176 return ExprError();
4177 Arg = ArgResult.take();
4178
4179 QualType ArgType = Arg->getType();
4180
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004181 // C++ [temp.arg.nontype]p1:
4182 // A template-argument for a non-type, non-template
4183 // template-parameter shall be one of:
4184 //
4185 // -- an integral constant-expression of integral or enumeration
4186 // type; or
4187 // -- the name of a non-type template-parameter; or
4188 SourceLocation NonConstantLoc;
Douglas Gregor3e00bad2009-02-17 01:05:43 +00004189 llvm::APSInt Value;
Douglas Gregor2ade35e2010-06-16 00:17:44 +00004190 if (!ArgType->isIntegralOrEnumerationType()) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004191 Diag(Arg->getLocStart(),
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004192 diag::err_template_arg_not_integral_or_enumeral)
4193 << ArgType << Arg->getSourceRange();
4194 Diag(Param->getLocation(), diag::note_template_param_here);
John Wiegley429bb272011-04-08 18:41:53 +00004195 return ExprError();
Richard Smith282e7e62012-02-04 09:53:13 +00004196 } else if (!Arg->isValueDependent()) {
Douglas Gregorab41fe92012-05-04 22:38:52 +00004197 class TmplArgICEDiagnoser : public VerifyICEDiagnoser {
4198 QualType T;
4199
4200 public:
4201 TmplArgICEDiagnoser(QualType T) : T(T) { }
4202
4203 virtual void diagnoseNotICE(Sema &S, SourceLocation Loc,
4204 SourceRange SR) {
4205 S.Diag(Loc, diag::err_template_arg_not_ice) << T << SR;
4206 }
4207 } Diagnoser(ArgType);
4208
4209 Arg = VerifyIntegerConstantExpression(Arg, &Value, Diagnoser,
4210 false).take();
Richard Smith282e7e62012-02-04 09:53:13 +00004211 if (!Arg)
4212 return ExprError();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004213 }
4214
Douglas Gregor02024a92010-03-28 02:42:43 +00004215 // From here on out, all we care about are the unqualified forms
4216 // of the parameter and argument types.
4217 ParamType = ParamType.getUnqualifiedType();
4218 ArgType = ArgType.getUnqualifiedType();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004219
4220 // Try to convert the argument to the parameter's type.
Douglas Gregorff524392009-11-04 21:50:46 +00004221 if (Context.hasSameType(ParamType, ArgType)) {
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004222 // Okay: no conversion necessary
John McCalldaa8e4e2010-11-15 09:13:47 +00004223 } else if (ParamType->isBooleanType()) {
4224 // This is an integral-to-boolean conversion.
John Wiegley429bb272011-04-08 18:41:53 +00004225 Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralToBoolean).take();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004226 } else if (IsIntegralPromotion(Arg, ArgType, ParamType) ||
4227 !ParamType->isEnumeralType()) {
4228 // This is an integral promotion or conversion.
John Wiegley429bb272011-04-08 18:41:53 +00004229 Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralCast).take();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004230 } else {
4231 // We can't perform this conversion.
Daniel Dunbar96a00142012-03-09 18:35:03 +00004232 Diag(Arg->getLocStart(),
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004233 diag::err_template_arg_not_convertible)
Douglas Gregor2943aed2009-03-03 04:44:36 +00004234 << Arg->getType() << InstantiatedParamType << Arg->getSourceRange();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004235 Diag(Param->getLocation(), diag::note_template_param_here);
John Wiegley429bb272011-04-08 18:41:53 +00004236 return ExprError();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004237 }
4238
Douglas Gregorc7469372011-05-04 21:55:00 +00004239 // Add the value of this argument to the list of converted
4240 // arguments. We use the bitwidth and signedness of the template
4241 // parameter.
4242 if (Arg->isValueDependent()) {
4243 // The argument is value-dependent. Create a new
4244 // TemplateArgument with the converted expression.
4245 Converted = TemplateArgument(Arg);
4246 return Owned(Arg);
4247 }
4248
Douglas Gregorf80a9d52009-03-14 00:20:21 +00004249 QualType IntegerType = Context.getCanonicalType(ParamType);
John McCall183700f2009-09-21 23:43:11 +00004250 if (const EnumType *Enum = IntegerType->getAs<EnumType>())
Douglas Gregor02cbbd22009-06-11 18:10:32 +00004251 IntegerType = Context.getCanonicalType(Enum->getDecl()->getIntegerType());
Douglas Gregorf80a9d52009-03-14 00:20:21 +00004252
Douglas Gregorc7469372011-05-04 21:55:00 +00004253 if (ParamType->isBooleanType()) {
4254 // Value must be zero or one.
4255 Value = Value != 0;
4256 unsigned AllowedBits = Context.getTypeSize(IntegerType);
4257 if (Value.getBitWidth() != AllowedBits)
4258 Value = Value.extOrTrunc(AllowedBits);
Douglas Gregor575a1c92011-05-20 16:38:50 +00004259 Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType());
Douglas Gregorc7469372011-05-04 21:55:00 +00004260 } else {
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004261 llvm::APSInt OldValue = Value;
Douglas Gregorc7469372011-05-04 21:55:00 +00004262
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004263 // Coerce the template argument's value to the value it will have
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004264 // based on the template parameter's type.
Douglas Gregor0d4fd8e2010-03-26 00:39:40 +00004265 unsigned AllowedBits = Context.getTypeSize(IntegerType);
Douglas Gregor0d4fd8e2010-03-26 00:39:40 +00004266 if (Value.getBitWidth() != AllowedBits)
Jay Foad9f71a8f2010-12-07 08:25:34 +00004267 Value = Value.extOrTrunc(AllowedBits);
Douglas Gregor575a1c92011-05-20 16:38:50 +00004268 Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType());
Douglas Gregorc7469372011-05-04 21:55:00 +00004269
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004270 // Complain if an unsigned parameter received a negative value.
Douglas Gregor575a1c92011-05-20 16:38:50 +00004271 if (IntegerType->isUnsignedIntegerOrEnumerationType()
Douglas Gregorc7469372011-05-04 21:55:00 +00004272 && (OldValue.isSigned() && OldValue.isNegative())) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004273 Diag(Arg->getLocStart(), diag::warn_template_arg_negative)
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004274 << OldValue.toString(10) << Value.toString(10) << Param->getType()
4275 << Arg->getSourceRange();
4276 Diag(Param->getLocation(), diag::note_template_param_here);
4277 }
Douglas Gregorc7469372011-05-04 21:55:00 +00004278
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004279 // Complain if we overflowed the template parameter's type.
4280 unsigned RequiredBits;
Douglas Gregor575a1c92011-05-20 16:38:50 +00004281 if (IntegerType->isUnsignedIntegerOrEnumerationType())
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004282 RequiredBits = OldValue.getActiveBits();
4283 else if (OldValue.isUnsigned())
4284 RequiredBits = OldValue.getActiveBits() + 1;
4285 else
4286 RequiredBits = OldValue.getMinSignedBits();
4287 if (RequiredBits > AllowedBits) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004288 Diag(Arg->getLocStart(),
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004289 diag::warn_template_arg_too_large)
4290 << OldValue.toString(10) << Value.toString(10) << Param->getType()
4291 << Arg->getSourceRange();
4292 Diag(Param->getLocation(), diag::note_template_param_here);
4293 }
Douglas Gregorf80a9d52009-03-14 00:20:21 +00004294 }
Douglas Gregor3e00bad2009-02-17 01:05:43 +00004295
Benjamin Kramer85524372012-06-07 15:09:51 +00004296 Converted = TemplateArgument(Context, Value,
Douglas Gregor6b63f552011-08-09 01:55:14 +00004297 ParamType->isEnumeralType()
4298 ? Context.getCanonicalType(ParamType)
4299 : IntegerType);
John Wiegley429bb272011-04-08 18:41:53 +00004300 return Owned(Arg);
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004301 }
Douglas Gregora35284b2009-02-11 00:19:33 +00004302
Richard Smith4f870622011-10-27 22:11:44 +00004303 QualType ArgType = Arg->getType();
John McCall6bb80172010-03-30 21:47:33 +00004304 DeclAccessPair FoundResult; // temporary for ResolveOverloadedFunction
4305
Douglas Gregorb86b0572009-02-11 01:18:59 +00004306 // Handle pointer-to-function, reference-to-function, and
4307 // pointer-to-member-function all in (roughly) the same way.
4308 if (// -- For a non-type template-parameter of type pointer to
4309 // function, only the function-to-pointer conversion (4.3) is
4310 // applied. If the template-argument represents a set of
4311 // overloaded functions (or a pointer to such), the matching
4312 // function is selected from the set (13.4).
4313 (ParamType->isPointerType() &&
Ted Kremenek6217b802009-07-29 21:53:49 +00004314 ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType()) ||
Douglas Gregorb86b0572009-02-11 01:18:59 +00004315 // -- For a non-type template-parameter of type reference to
4316 // function, no conversions apply. If the template-argument
4317 // represents a set of overloaded functions, the matching
4318 // function is selected from the set (13.4).
4319 (ParamType->isReferenceType() &&
Ted Kremenek6217b802009-07-29 21:53:49 +00004320 ParamType->getAs<ReferenceType>()->getPointeeType()->isFunctionType()) ||
Douglas Gregorb86b0572009-02-11 01:18:59 +00004321 // -- For a non-type template-parameter of type pointer to
4322 // member function, no conversions apply. If the
4323 // template-argument represents a set of overloaded member
4324 // functions, the matching member function is selected from
4325 // the set (13.4).
4326 (ParamType->isMemberPointerType() &&
Ted Kremenek6217b802009-07-29 21:53:49 +00004327 ParamType->getAs<MemberPointerType>()->getPointeeType()
Douglas Gregorb86b0572009-02-11 01:18:59 +00004328 ->isFunctionType())) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00004329
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004330 if (Arg->getType() == Context.OverloadTy) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004331 if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg, ParamType,
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004332 true,
4333 FoundResult)) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004334 if (DiagnoseUseOfDecl(Fn, Arg->getLocStart()))
John Wiegley429bb272011-04-08 18:41:53 +00004335 return ExprError();
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004336
4337 Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn);
4338 ArgType = Arg->getType();
4339 } else
John Wiegley429bb272011-04-08 18:41:53 +00004340 return ExprError();
Douglas Gregora35284b2009-02-11 00:19:33 +00004341 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004342
John Wiegley429bb272011-04-08 18:41:53 +00004343 if (!ParamType->isMemberPointerType()) {
4344 if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param,
4345 ParamType,
4346 Arg, Converted))
4347 return ExprError();
4348 return Owned(Arg);
4349 }
Douglas Gregorb7a09262010-04-01 18:32:35 +00004350
Douglas Gregor42963612012-04-10 17:08:25 +00004351 if (CheckTemplateArgumentPointerToMember(*this, Param, ParamType, Arg,
4352 Converted))
John Wiegley429bb272011-04-08 18:41:53 +00004353 return ExprError();
4354 return Owned(Arg);
Douglas Gregora35284b2009-02-11 00:19:33 +00004355 }
4356
Chris Lattnerfe90de72009-02-20 21:37:53 +00004357 if (ParamType->isPointerType()) {
Douglas Gregorb86b0572009-02-11 01:18:59 +00004358 // -- for a non-type template-parameter of type pointer to
4359 // object, qualification conversions (4.4) and the
4360 // array-to-pointer conversion (4.2) are applied.
Sebastian Redl6e8ed162009-05-10 18:38:11 +00004361 // C++0x also allows a value of std::nullptr_t.
Eli Friedman13578692010-08-05 02:49:48 +00004362 assert(ParamType->getPointeeType()->isIncompleteOrObjectType() &&
Douglas Gregorb86b0572009-02-11 01:18:59 +00004363 "Only object pointers allowed here");
Douglas Gregorf684e6e2009-02-11 00:44:29 +00004364
John Wiegley429bb272011-04-08 18:41:53 +00004365 if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param,
4366 ParamType,
4367 Arg, Converted))
4368 return ExprError();
4369 return Owned(Arg);
Douglas Gregorf684e6e2009-02-11 00:44:29 +00004370 }
Mike Stump1eb44332009-09-09 15:08:12 +00004371
Ted Kremenek6217b802009-07-29 21:53:49 +00004372 if (const ReferenceType *ParamRefType = ParamType->getAs<ReferenceType>()) {
Douglas Gregorb86b0572009-02-11 01:18:59 +00004373 // -- For a non-type template-parameter of type reference to
4374 // object, no conversions apply. The type referred to by the
4375 // reference may be more cv-qualified than the (otherwise
4376 // identical) type of the template-argument. The
4377 // template-parameter is bound directly to the
4378 // template-argument, which must be an lvalue.
Eli Friedman13578692010-08-05 02:49:48 +00004379 assert(ParamRefType->getPointeeType()->isIncompleteOrObjectType() &&
Douglas Gregorb86b0572009-02-11 01:18:59 +00004380 "Only object references allowed here");
Douglas Gregorf684e6e2009-02-11 00:44:29 +00004381
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004382 if (Arg->getType() == Context.OverloadTy) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004383 if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg,
4384 ParamRefType->getPointeeType(),
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004385 true,
4386 FoundResult)) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004387 if (DiagnoseUseOfDecl(Fn, Arg->getLocStart()))
John Wiegley429bb272011-04-08 18:41:53 +00004388 return ExprError();
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004389
4390 Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn);
4391 ArgType = Arg->getType();
4392 } else
John Wiegley429bb272011-04-08 18:41:53 +00004393 return ExprError();
Douglas Gregorb86b0572009-02-11 01:18:59 +00004394 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004395
John Wiegley429bb272011-04-08 18:41:53 +00004396 if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param,
4397 ParamType,
4398 Arg, Converted))
4399 return ExprError();
4400 return Owned(Arg);
Douglas Gregorb86b0572009-02-11 01:18:59 +00004401 }
Douglas Gregor658bbb52009-02-11 16:16:59 +00004402
Douglas Gregor42963612012-04-10 17:08:25 +00004403 // Deal with parameters of type std::nullptr_t.
4404 if (ParamType->isNullPtrType()) {
4405 if (Arg->isTypeDependent() || Arg->isValueDependent()) {
4406 Converted = TemplateArgument(Arg);
4407 return Owned(Arg);
4408 }
4409
4410 switch (isNullPointerValueTemplateArgument(*this, Param, ParamType, Arg)) {
4411 case NPV_NotNullPointer:
4412 Diag(Arg->getExprLoc(), diag::err_template_arg_not_convertible)
4413 << Arg->getType() << ParamType;
4414 Diag(Param->getLocation(), diag::note_template_param_here);
4415 return ExprError();
4416
4417 case NPV_Error:
4418 return ExprError();
4419
4420 case NPV_NullPointer:
Richard Smith86e6fdc2012-04-26 01:51:03 +00004421 Diag(Arg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null);
Eli Friedmand7a6b162012-09-26 02:36:12 +00004422 Converted = TemplateArgument(ParamType, /*isNullPtr*/true);
Dmitri Gribenko1ad23d62012-09-10 21:20:09 +00004423 return Owned(Arg);
Douglas Gregor42963612012-04-10 17:08:25 +00004424 }
4425 }
4426
Douglas Gregor658bbb52009-02-11 16:16:59 +00004427 // -- For a non-type template-parameter of type pointer to data
4428 // member, qualification conversions (4.4) are applied.
4429 assert(ParamType->isMemberPointerType() && "Only pointers to members remain");
4430
Douglas Gregor42963612012-04-10 17:08:25 +00004431 if (CheckTemplateArgumentPointerToMember(*this, Param, ParamType, Arg,
4432 Converted))
John Wiegley429bb272011-04-08 18:41:53 +00004433 return ExprError();
4434 return Owned(Arg);
Douglas Gregorc15cb382009-02-09 23:23:08 +00004435}
4436
4437/// \brief Check a template argument against its corresponding
4438/// template template parameter.
4439///
4440/// This routine implements the semantics of C++ [temp.arg.template].
4441/// It returns true if an error occurred, and false otherwise.
4442bool Sema::CheckTemplateArgument(TemplateTemplateParmDecl *Param,
Richard Smith6964b3f2012-09-07 02:06:42 +00004443 const TemplateArgumentLoc &Arg,
4444 unsigned ArgumentPackIndex) {
Eli Friedmand7a6b162012-09-26 02:36:12 +00004445 TemplateName Name = Arg.getArgument().getAsTemplateOrTemplatePattern();
Douglas Gregor788cd062009-11-11 01:00:40 +00004446 TemplateDecl *Template = Name.getAsTemplateDecl();
4447 if (!Template) {
4448 // Any dependent template name is fine.
4449 assert(Name.isDependent() && "Non-dependent template isn't a declaration?");
4450 return false;
4451 }
Douglas Gregordd0574e2009-02-10 00:24:35 +00004452
Richard Smith3e4c6c42011-05-05 21:57:07 +00004453 // C++0x [temp.arg.template]p1:
Douglas Gregordd0574e2009-02-10 00:24:35 +00004454 // A template-argument for a template template-parameter shall be
Richard Smith3e4c6c42011-05-05 21:57:07 +00004455 // the name of a class template or an alias template, expressed as an
4456 // id-expression. When the template-argument names a class template, only
Douglas Gregordd0574e2009-02-10 00:24:35 +00004457 // primary class templates are considered when matching the
4458 // template template argument with the corresponding parameter;
4459 // partial specializations are not considered even if their
4460 // parameter lists match that of the template template parameter.
Douglas Gregorba1ecb52009-06-12 19:43:02 +00004461 //
4462 // Note that we also allow template template parameters here, which
4463 // will happen when we are dealing with, e.g., class template
4464 // partial specializations.
Mike Stump1eb44332009-09-09 15:08:12 +00004465 if (!isa<ClassTemplateDecl>(Template) &&
Richard Smith3e4c6c42011-05-05 21:57:07 +00004466 !isa<TemplateTemplateParmDecl>(Template) &&
4467 !isa<TypeAliasTemplateDecl>(Template)) {
Mike Stump1eb44332009-09-09 15:08:12 +00004468 assert(isa<FunctionTemplateDecl>(Template) &&
Douglas Gregordd0574e2009-02-10 00:24:35 +00004469 "Only function templates are possible here");
Douglas Gregor788cd062009-11-11 01:00:40 +00004470 Diag(Arg.getLocation(), diag::err_template_arg_not_class_template);
Douglas Gregore53060f2009-06-25 22:08:12 +00004471 Diag(Template->getLocation(), diag::note_template_arg_refers_here_func)
Douglas Gregordd0574e2009-02-10 00:24:35 +00004472 << Template;
4473 }
4474
Richard Smith6964b3f2012-09-07 02:06:42 +00004475 TemplateParameterList *Params = Param->getTemplateParameters();
4476 if (Param->isExpandedParameterPack())
4477 Params = Param->getExpansionTemplateParameters(ArgumentPackIndex);
4478
Douglas Gregordd0574e2009-02-10 00:24:35 +00004479 return !TemplateParameterListsAreEqual(Template->getTemplateParameters(),
Richard Smith6964b3f2012-09-07 02:06:42 +00004480 Params,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004481 true,
Douglas Gregorfb898e12009-11-12 16:20:59 +00004482 TPL_TemplateTemplateArgumentMatch,
Douglas Gregor788cd062009-11-11 01:00:40 +00004483 Arg.getLocation());
Douglas Gregorc15cb382009-02-09 23:23:08 +00004484}
4485
Douglas Gregor02024a92010-03-28 02:42:43 +00004486/// \brief Given a non-type template argument that refers to a
4487/// declaration and the type of its corresponding non-type template
4488/// parameter, produce an expression that properly refers to that
4489/// declaration.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004490ExprResult
Douglas Gregor02024a92010-03-28 02:42:43 +00004491Sema::BuildExpressionFromDeclTemplateArgument(const TemplateArgument &Arg,
4492 QualType ParamType,
4493 SourceLocation Loc) {
David Blaikiec0cedbe2013-02-27 22:10:40 +00004494 // C++ [temp.param]p8:
4495 //
4496 // A non-type template-parameter of type "array of T" or
4497 // "function returning T" is adjusted to be of type "pointer to
4498 // T" or "pointer to function returning T", respectively.
4499 if (ParamType->isArrayType())
4500 ParamType = Context.getArrayDecayedType(ParamType);
4501 else if (ParamType->isFunctionType())
4502 ParamType = Context.getPointerType(ParamType);
4503
Douglas Gregord2008e22012-04-06 22:40:38 +00004504 // For a NULL non-type template argument, return nullptr casted to the
4505 // parameter's type.
Eli Friedmand7a6b162012-09-26 02:36:12 +00004506 if (Arg.getKind() == TemplateArgument::NullPtr) {
Douglas Gregord2008e22012-04-06 22:40:38 +00004507 return ImpCastExprToType(
4508 new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc),
4509 ParamType,
4510 ParamType->getAs<MemberPointerType>()
4511 ? CK_NullToMemberPointer
4512 : CK_NullToPointer);
4513 }
Eli Friedmand7a6b162012-09-26 02:36:12 +00004514 assert(Arg.getKind() == TemplateArgument::Declaration &&
4515 "Only declaration template arguments permitted here");
4516
Douglas Gregor02024a92010-03-28 02:42:43 +00004517 ValueDecl *VD = cast<ValueDecl>(Arg.getAsDecl());
4518
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004519 if (VD->getDeclContext()->isRecord() &&
Douglas Gregor02024a92010-03-28 02:42:43 +00004520 (isa<CXXMethodDecl>(VD) || isa<FieldDecl>(VD))) {
4521 // If the value is a class member, we might have a pointer-to-member.
4522 // Determine whether the non-type template template parameter is of
4523 // pointer-to-member type. If so, we need to build an appropriate
4524 // expression for a pointer-to-member, since a "normal" DeclRefExpr
4525 // would refer to the member itself.
4526 if (ParamType->isMemberPointerType()) {
4527 QualType ClassType
4528 = Context.getTypeDeclType(cast<RecordDecl>(VD->getDeclContext()));
4529 NestedNameSpecifier *Qualifier
John McCall9ae2f072010-08-23 23:25:46 +00004530 = NestedNameSpecifier::Create(Context, 0, false,
4531 ClassType.getTypePtr());
Douglas Gregor02024a92010-03-28 02:42:43 +00004532 CXXScopeSpec SS;
Douglas Gregorc34348a2011-02-24 17:54:50 +00004533 SS.MakeTrivial(Context, Qualifier, Loc);
John McCalldfa1edb2010-11-23 20:48:44 +00004534
4535 // The actual value-ness of this is unimportant, but for
4536 // internal consistency's sake, references to instance methods
4537 // are r-values.
4538 ExprValueKind VK = VK_LValue;
4539 if (isa<CXXMethodDecl>(VD) && cast<CXXMethodDecl>(VD)->isInstance())
4540 VK = VK_RValue;
4541
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004542 ExprResult RefExpr = BuildDeclRefExpr(VD,
John McCallf89e55a2010-11-18 06:31:45 +00004543 VD->getType().getNonReferenceType(),
John McCalldfa1edb2010-11-23 20:48:44 +00004544 VK,
John McCallf89e55a2010-11-18 06:31:45 +00004545 Loc,
4546 &SS);
Douglas Gregor02024a92010-03-28 02:42:43 +00004547 if (RefExpr.isInvalid())
4548 return ExprError();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004549
John McCall2de56d12010-08-25 11:45:40 +00004550 RefExpr = CreateBuiltinUnaryOp(Loc, UO_AddrOf, RefExpr.get());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004551
Douglas Gregorc0c83002010-04-30 21:46:38 +00004552 // We might need to perform a trailing qualification conversion, since
4553 // the element type on the parameter could be more qualified than the
4554 // element type in the expression we constructed.
John McCallf85e1932011-06-15 23:02:42 +00004555 bool ObjCLifetimeConversion;
Douglas Gregorc0c83002010-04-30 21:46:38 +00004556 if (IsQualificationConversion(((Expr*) RefExpr.get())->getType(),
John McCallf85e1932011-06-15 23:02:42 +00004557 ParamType.getUnqualifiedType(), false,
4558 ObjCLifetimeConversion))
John Wiegley429bb272011-04-08 18:41:53 +00004559 RefExpr = ImpCastExprToType(RefExpr.take(), ParamType.getUnqualifiedType(), CK_NoOp);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004560
Douglas Gregor02024a92010-03-28 02:42:43 +00004561 assert(!RefExpr.isInvalid() &&
4562 Context.hasSameType(((Expr*) RefExpr.get())->getType(),
Douglas Gregorc0c83002010-04-30 21:46:38 +00004563 ParamType.getUnqualifiedType()));
Benjamin Kramer3fe198b2012-08-23 21:35:17 +00004564 return RefExpr;
Douglas Gregor02024a92010-03-28 02:42:43 +00004565 }
4566 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004567
Douglas Gregor02024a92010-03-28 02:42:43 +00004568 QualType T = VD->getType().getNonReferenceType();
Douglas Gregorb9df75f2013-01-16 00:52:15 +00004569
Douglas Gregor02024a92010-03-28 02:42:43 +00004570 if (ParamType->isPointerType()) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00004571 // When the non-type template parameter is a pointer, take the
4572 // address of the declaration.
John McCallf89e55a2010-11-18 06:31:45 +00004573 ExprResult RefExpr = BuildDeclRefExpr(VD, T, VK_LValue, Loc);
Douglas Gregor02024a92010-03-28 02:42:43 +00004574 if (RefExpr.isInvalid())
4575 return ExprError();
Douglas Gregorb7a09262010-04-01 18:32:35 +00004576
4577 if (T->isFunctionType() || T->isArrayType()) {
4578 // Decay functions and arrays.
John Wiegley429bb272011-04-08 18:41:53 +00004579 RefExpr = DefaultFunctionArrayConversion(RefExpr.take());
4580 if (RefExpr.isInvalid())
4581 return ExprError();
Douglas Gregorb7a09262010-04-01 18:32:35 +00004582
Benjamin Kramer3fe198b2012-08-23 21:35:17 +00004583 return RefExpr;
Douglas Gregor02024a92010-03-28 02:42:43 +00004584 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004585
Douglas Gregorb7a09262010-04-01 18:32:35 +00004586 // Take the address of everything else
John McCall2de56d12010-08-25 11:45:40 +00004587 return CreateBuiltinUnaryOp(Loc, UO_AddrOf, RefExpr.get());
Douglas Gregor02024a92010-03-28 02:42:43 +00004588 }
4589
John McCallf89e55a2010-11-18 06:31:45 +00004590 ExprValueKind VK = VK_RValue;
4591
Douglas Gregor02024a92010-03-28 02:42:43 +00004592 // If the non-type template parameter has reference type, qualify the
4593 // resulting declaration reference with the extra qualifiers on the
4594 // type that the reference refers to.
John McCallf89e55a2010-11-18 06:31:45 +00004595 if (const ReferenceType *TargetRef = ParamType->getAs<ReferenceType>()) {
4596 VK = VK_LValue;
4597 T = Context.getQualifiedType(T,
4598 TargetRef->getPointeeType().getQualifiers());
Douglas Gregorb9df75f2013-01-16 00:52:15 +00004599 } else if (isa<FunctionDecl>(VD)) {
4600 // References to functions are always lvalues.
4601 VK = VK_LValue;
John McCallf89e55a2010-11-18 06:31:45 +00004602 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004603
John McCallf89e55a2010-11-18 06:31:45 +00004604 return BuildDeclRefExpr(VD, T, VK, Loc);
Douglas Gregor02024a92010-03-28 02:42:43 +00004605}
4606
4607/// \brief Construct a new expression that refers to the given
4608/// integral template argument with the given source-location
4609/// information.
4610///
4611/// This routine takes care of the mapping from an integral template
4612/// argument (which may have any integral type) to the appropriate
4613/// literal value.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004614ExprResult
Douglas Gregor02024a92010-03-28 02:42:43 +00004615Sema::BuildExpressionFromIntegralTemplateArgument(const TemplateArgument &Arg,
4616 SourceLocation Loc) {
4617 assert(Arg.getKind() == TemplateArgument::Integral &&
Douglas Gregord3731192011-01-10 07:32:04 +00004618 "Operation is only valid for integral template arguments");
Benjamin Kramer39ad0f02012-11-21 17:42:47 +00004619 QualType OrigT = Arg.getIntegralType();
4620
4621 // If this is an enum type that we're instantiating, we need to use an integer
4622 // type the same size as the enumerator. We don't want to build an
4623 // IntegerLiteral with enum type. The integer type of an enum type can be of
4624 // any integral type with C++11 enum classes, make sure we create the right
4625 // type of literal for it.
4626 QualType T = OrigT;
4627 if (const EnumType *ET = OrigT->getAs<EnumType>())
4628 T = ET->getDecl()->getIntegerType();
4629
4630 Expr *E;
Douglas Gregor5cee1192011-07-27 05:40:30 +00004631 if (T->isAnyCharacterType()) {
4632 CharacterLiteral::CharacterKind Kind;
4633 if (T->isWideCharType())
4634 Kind = CharacterLiteral::Wide;
4635 else if (T->isChar16Type())
4636 Kind = CharacterLiteral::UTF16;
4637 else if (T->isChar32Type())
4638 Kind = CharacterLiteral::UTF32;
4639 else
4640 Kind = CharacterLiteral::Ascii;
4641
Benjamin Kramer39ad0f02012-11-21 17:42:47 +00004642 E = new (Context) CharacterLiteral(Arg.getAsIntegral().getZExtValue(),
4643 Kind, T, Loc);
4644 } else if (T->isBooleanType()) {
4645 E = new (Context) CXXBoolLiteralExpr(Arg.getAsIntegral().getBoolValue(),
4646 T, Loc);
4647 } else if (T->isNullPtrType()) {
4648 E = new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc);
4649 } else {
4650 E = IntegerLiteral::Create(Context, Arg.getAsIntegral(), T, Loc);
Douglas Gregor5cee1192011-07-27 05:40:30 +00004651 }
4652
Benjamin Kramer39ad0f02012-11-21 17:42:47 +00004653 if (OrigT->isEnumeralType()) {
John McCall4e9272d2011-07-15 07:47:58 +00004654 // FIXME: This is a hack. We need a better way to handle substituted
4655 // non-type template parameters.
Benjamin Kramer39ad0f02012-11-21 17:42:47 +00004656 E = CStyleCastExpr::Create(Context, OrigT, VK_RValue, CK_IntegralCast, E, 0,
4657 Context.getTrivialTypeSourceInfo(OrigT, Loc),
John McCall4e9272d2011-07-15 07:47:58 +00004658 Loc, Loc);
4659 }
4660
4661 return Owned(E);
Douglas Gregor02024a92010-03-28 02:42:43 +00004662}
4663
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004664/// \brief Match two template parameters within template parameter lists.
4665static bool MatchTemplateParameterKind(Sema &S, NamedDecl *New, NamedDecl *Old,
4666 bool Complain,
4667 Sema::TemplateParameterListEqualKind Kind,
4668 SourceLocation TemplateArgLoc) {
4669 // Check the actual kind (type, non-type, template).
4670 if (Old->getKind() != New->getKind()) {
4671 if (Complain) {
4672 unsigned NextDiag = diag::err_template_param_different_kind;
4673 if (TemplateArgLoc.isValid()) {
4674 S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch);
4675 NextDiag = diag::note_template_param_different_kind;
4676 }
4677 S.Diag(New->getLocation(), NextDiag)
4678 << (Kind != Sema::TPL_TemplateMatch);
4679 S.Diag(Old->getLocation(), diag::note_template_prev_declaration)
4680 << (Kind != Sema::TPL_TemplateMatch);
4681 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004682
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004683 return false;
4684 }
4685
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004686 // Check that both are parameter packs are neither are parameter packs.
4687 // However, if we are matching a template template argument to a
Douglas Gregora0347822011-01-13 00:08:50 +00004688 // template template parameter, the template template parameter can have
4689 // a parameter pack where the template template argument does not.
4690 if (Old->isTemplateParameterPack() != New->isTemplateParameterPack() &&
4691 !(Kind == Sema::TPL_TemplateTemplateArgumentMatch &&
4692 Old->isTemplateParameterPack())) {
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004693 if (Complain) {
4694 unsigned NextDiag = diag::err_template_parameter_pack_non_pack;
4695 if (TemplateArgLoc.isValid()) {
4696 S.Diag(TemplateArgLoc,
4697 diag::err_template_arg_template_params_mismatch);
4698 NextDiag = diag::note_template_parameter_pack_non_pack;
4699 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004700
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004701 unsigned ParamKind = isa<TemplateTypeParmDecl>(New)? 0
4702 : isa<NonTypeTemplateParmDecl>(New)? 1
4703 : 2;
4704 S.Diag(New->getLocation(), NextDiag)
4705 << ParamKind << New->isParameterPack();
4706 S.Diag(Old->getLocation(), diag::note_template_parameter_pack_here)
4707 << ParamKind << Old->isParameterPack();
4708 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004709
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004710 return false;
4711 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004712
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004713 // For non-type template parameters, check the type of the parameter.
4714 if (NonTypeTemplateParmDecl *OldNTTP
4715 = dyn_cast<NonTypeTemplateParmDecl>(Old)) {
4716 NonTypeTemplateParmDecl *NewNTTP = cast<NonTypeTemplateParmDecl>(New);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004717
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004718 // If we are matching a template template argument to a template
4719 // template parameter and one of the non-type template parameter types
4720 // is dependent, then we must wait until template instantiation time
4721 // to actually compare the arguments.
4722 if (Kind == Sema::TPL_TemplateTemplateArgumentMatch &&
4723 (OldNTTP->getType()->isDependentType() ||
4724 NewNTTP->getType()->isDependentType()))
4725 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004726
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004727 if (!S.Context.hasSameType(OldNTTP->getType(), NewNTTP->getType())) {
4728 if (Complain) {
4729 unsigned NextDiag = diag::err_template_nontype_parm_different_type;
4730 if (TemplateArgLoc.isValid()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004731 S.Diag(TemplateArgLoc,
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004732 diag::err_template_arg_template_params_mismatch);
4733 NextDiag = diag::note_template_nontype_parm_different_type;
4734 }
4735 S.Diag(NewNTTP->getLocation(), NextDiag)
4736 << NewNTTP->getType()
4737 << (Kind != Sema::TPL_TemplateMatch);
4738 S.Diag(OldNTTP->getLocation(),
4739 diag::note_template_nontype_parm_prev_declaration)
4740 << OldNTTP->getType();
4741 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004742
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004743 return false;
4744 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004745
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004746 return true;
4747 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004748
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004749 // For template template parameters, check the template parameter types.
4750 // The template parameter lists of template template
4751 // parameters must agree.
4752 if (TemplateTemplateParmDecl *OldTTP
4753 = dyn_cast<TemplateTemplateParmDecl>(Old)) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004754 TemplateTemplateParmDecl *NewTTP = cast<TemplateTemplateParmDecl>(New);
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004755 return S.TemplateParameterListsAreEqual(NewTTP->getTemplateParameters(),
4756 OldTTP->getTemplateParameters(),
4757 Complain,
4758 (Kind == Sema::TPL_TemplateMatch
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004759 ? Sema::TPL_TemplateTemplateParmMatch
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004760 : Kind),
4761 TemplateArgLoc);
4762 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004763
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004764 return true;
4765}
Douglas Gregor02024a92010-03-28 02:42:43 +00004766
Douglas Gregora0347822011-01-13 00:08:50 +00004767/// \brief Diagnose a known arity mismatch when comparing template argument
4768/// lists.
4769static
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004770void DiagnoseTemplateParameterListArityMismatch(Sema &S,
Douglas Gregora0347822011-01-13 00:08:50 +00004771 TemplateParameterList *New,
4772 TemplateParameterList *Old,
4773 Sema::TemplateParameterListEqualKind Kind,
4774 SourceLocation TemplateArgLoc) {
4775 unsigned NextDiag = diag::err_template_param_list_different_arity;
4776 if (TemplateArgLoc.isValid()) {
4777 S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch);
4778 NextDiag = diag::note_template_param_list_different_arity;
4779 }
4780 S.Diag(New->getTemplateLoc(), NextDiag)
4781 << (New->size() > Old->size())
4782 << (Kind != Sema::TPL_TemplateMatch)
4783 << SourceRange(New->getTemplateLoc(), New->getRAngleLoc());
4784 S.Diag(Old->getTemplateLoc(), diag::note_template_prev_declaration)
4785 << (Kind != Sema::TPL_TemplateMatch)
4786 << SourceRange(Old->getTemplateLoc(), Old->getRAngleLoc());
4787}
4788
Douglas Gregorddc29e12009-02-06 22:42:48 +00004789/// \brief Determine whether the given template parameter lists are
4790/// equivalent.
4791///
Mike Stump1eb44332009-09-09 15:08:12 +00004792/// \param New The new template parameter list, typically written in the
Douglas Gregorddc29e12009-02-06 22:42:48 +00004793/// source code as part of a new template declaration.
4794///
4795/// \param Old The old template parameter list, typically found via
4796/// name lookup of the template declared with this template parameter
4797/// list.
4798///
4799/// \param Complain If true, this routine will produce a diagnostic if
4800/// the template parameter lists are not equivalent.
4801///
Douglas Gregorfb898e12009-11-12 16:20:59 +00004802/// \param Kind describes how we are to match the template parameter lists.
Douglas Gregordd0574e2009-02-10 00:24:35 +00004803///
4804/// \param TemplateArgLoc If this source location is valid, then we
4805/// are actually checking the template parameter list of a template
4806/// argument (New) against the template parameter list of its
4807/// corresponding template template parameter (Old). We produce
4808/// slightly different diagnostics in this scenario.
4809///
Douglas Gregorddc29e12009-02-06 22:42:48 +00004810/// \returns True if the template parameter lists are equal, false
4811/// otherwise.
Mike Stump1eb44332009-09-09 15:08:12 +00004812bool
Douglas Gregorddc29e12009-02-06 22:42:48 +00004813Sema::TemplateParameterListsAreEqual(TemplateParameterList *New,
4814 TemplateParameterList *Old,
4815 bool Complain,
Douglas Gregorfb898e12009-11-12 16:20:59 +00004816 TemplateParameterListEqualKind Kind,
Douglas Gregordd0574e2009-02-10 00:24:35 +00004817 SourceLocation TemplateArgLoc) {
Douglas Gregora0347822011-01-13 00:08:50 +00004818 if (Old->size() != New->size() && Kind != TPL_TemplateTemplateArgumentMatch) {
4819 if (Complain)
4820 DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind,
4821 TemplateArgLoc);
Douglas Gregorddc29e12009-02-06 22:42:48 +00004822
4823 return false;
4824 }
4825
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004826 // C++0x [temp.arg.template]p3:
4827 // A template-argument matches a template template-parameter (call it P)
NAKAMURA Takumi00995302011-01-27 07:09:49 +00004828 // when each of the template parameters in the template-parameter-list of
Richard Smith3e4c6c42011-05-05 21:57:07 +00004829 // the template-argument's corresponding class template or alias template
NAKAMURA Takumi00995302011-01-27 07:09:49 +00004830 // (call it A) matches the corresponding template parameter in the
Douglas Gregora0347822011-01-13 00:08:50 +00004831 // template-parameter-list of P. [...]
4832 TemplateParameterList::iterator NewParm = New->begin();
4833 TemplateParameterList::iterator NewParmEnd = New->end();
Douglas Gregorddc29e12009-02-06 22:42:48 +00004834 for (TemplateParameterList::iterator OldParm = Old->begin(),
Douglas Gregora0347822011-01-13 00:08:50 +00004835 OldParmEnd = Old->end();
4836 OldParm != OldParmEnd; ++OldParm) {
Douglas Gregorc421f542011-01-13 18:47:47 +00004837 if (Kind != TPL_TemplateTemplateArgumentMatch ||
4838 !(*OldParm)->isTemplateParameterPack()) {
Douglas Gregora0347822011-01-13 00:08:50 +00004839 if (NewParm == NewParmEnd) {
4840 if (Complain)
4841 DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind,
4842 TemplateArgLoc);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004843
Douglas Gregora0347822011-01-13 00:08:50 +00004844 return false;
4845 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004846
Douglas Gregora0347822011-01-13 00:08:50 +00004847 if (!MatchTemplateParameterKind(*this, *NewParm, *OldParm, Complain,
4848 Kind, TemplateArgLoc))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004849 return false;
4850
Douglas Gregora0347822011-01-13 00:08:50 +00004851 ++NewParm;
4852 continue;
4853 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004854
Douglas Gregora0347822011-01-13 00:08:50 +00004855 // C++0x [temp.arg.template]p3:
NAKAMURA Takumi00995302011-01-27 07:09:49 +00004856 // [...] When P's template- parameter-list contains a template parameter
4857 // pack (14.5.3), the template parameter pack will match zero or more
4858 // template parameters or template parameter packs in the
Douglas Gregora0347822011-01-13 00:08:50 +00004859 // template-parameter-list of A with the same type and form as the
4860 // template parameter pack in P (ignoring whether those template
4861 // parameters are template parameter packs).
4862 for (; NewParm != NewParmEnd; ++NewParm) {
4863 if (!MatchTemplateParameterKind(*this, *NewParm, *OldParm, Complain,
4864 Kind, TemplateArgLoc))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004865 return false;
Douglas Gregora0347822011-01-13 00:08:50 +00004866 }
Douglas Gregorddc29e12009-02-06 22:42:48 +00004867 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004868
Douglas Gregora0347822011-01-13 00:08:50 +00004869 // Make sure we exhausted all of the arguments.
4870 if (NewParm != NewParmEnd) {
4871 if (Complain)
4872 DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind,
4873 TemplateArgLoc);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004874
Douglas Gregora0347822011-01-13 00:08:50 +00004875 return false;
4876 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004877
Douglas Gregorddc29e12009-02-06 22:42:48 +00004878 return true;
4879}
4880
4881/// \brief Check whether a template can be declared within this scope.
4882///
4883/// If the template declaration is valid in this scope, returns
4884/// false. Otherwise, issues a diagnostic and returns true.
Mike Stump1eb44332009-09-09 15:08:12 +00004885bool
Douglas Gregor05396e22009-08-25 17:23:04 +00004886Sema::CheckTemplateDeclScope(Scope *S, TemplateParameterList *TemplateParams) {
Douglas Gregorfb35e8f2011-11-03 16:37:14 +00004887 if (!S)
4888 return false;
4889
Douglas Gregorddc29e12009-02-06 22:42:48 +00004890 // Find the nearest enclosing declaration scope.
4891 while ((S->getFlags() & Scope::DeclScope) == 0 ||
4892 (S->getFlags() & Scope::TemplateParamScope) != 0)
4893 S = S->getParent();
Mike Stump1eb44332009-09-09 15:08:12 +00004894
Douglas Gregorddc29e12009-02-06 22:42:48 +00004895 // C++ [temp]p2:
4896 // A template-declaration can appear only as a namespace scope or
4897 // class scope declaration.
4898 DeclContext *Ctx = static_cast<DeclContext *>(S->getEntity());
Eli Friedman1503f772009-07-31 01:43:05 +00004899 if (Ctx && isa<LinkageSpecDecl>(Ctx) &&
4900 cast<LinkageSpecDecl>(Ctx)->getLanguage() != LinkageSpecDecl::lang_cxx)
Mike Stump1eb44332009-09-09 15:08:12 +00004901 return Diag(TemplateParams->getTemplateLoc(), diag::err_template_linkage)
Douglas Gregor05396e22009-08-25 17:23:04 +00004902 << TemplateParams->getSourceRange();
Mike Stump1eb44332009-09-09 15:08:12 +00004903
Eli Friedman1503f772009-07-31 01:43:05 +00004904 while (Ctx && isa<LinkageSpecDecl>(Ctx))
Douglas Gregorddc29e12009-02-06 22:42:48 +00004905 Ctx = Ctx->getParent();
Douglas Gregorddc29e12009-02-06 22:42:48 +00004906
4907 if (Ctx && (Ctx->isFileContext() || Ctx->isRecord()))
4908 return false;
4909
Mike Stump1eb44332009-09-09 15:08:12 +00004910 return Diag(TemplateParams->getTemplateLoc(),
Douglas Gregor05396e22009-08-25 17:23:04 +00004911 diag::err_template_outside_namespace_or_class_scope)
4912 << TemplateParams->getSourceRange();
Douglas Gregorddc29e12009-02-06 22:42:48 +00004913}
Douglas Gregorcc636682009-02-17 23:15:12 +00004914
Douglas Gregord5cb8762009-10-07 00:13:32 +00004915/// \brief Determine what kind of template specialization the given declaration
4916/// is.
Douglas Gregorf785a7d2012-01-14 15:55:47 +00004917static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D) {
Douglas Gregord5cb8762009-10-07 00:13:32 +00004918 if (!D)
4919 return TSK_Undeclared;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004920
Douglas Gregorf6b11852009-10-08 15:14:33 +00004921 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D))
4922 return Record->getTemplateSpecializationKind();
Douglas Gregord5cb8762009-10-07 00:13:32 +00004923 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D))
4924 return Function->getTemplateSpecializationKind();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00004925 if (VarDecl *Var = dyn_cast<VarDecl>(D))
4926 return Var->getTemplateSpecializationKind();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004927
Douglas Gregord5cb8762009-10-07 00:13:32 +00004928 return TSK_Undeclared;
4929}
4930
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004931/// \brief Check whether a specialization is well-formed in the current
Douglas Gregor9302da62009-10-14 23:50:59 +00004932/// context.
Douglas Gregor88b70942009-02-25 22:02:03 +00004933///
Douglas Gregor9302da62009-10-14 23:50:59 +00004934/// This routine determines whether a template specialization can be declared
4935/// in the current context (C++ [temp.expl.spec]p2).
Douglas Gregord5cb8762009-10-07 00:13:32 +00004936///
4937/// \param S the semantic analysis object for which this check is being
4938/// performed.
4939///
4940/// \param Specialized the entity being specialized or instantiated, which
4941/// may be a kind of template (class template, function template, etc.) or
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004942/// a member of a class template (member function, static data member,
Douglas Gregord5cb8762009-10-07 00:13:32 +00004943/// member class).
4944///
4945/// \param PrevDecl the previous declaration of this entity, if any.
4946///
4947/// \param Loc the location of the explicit specialization or instantiation of
4948/// this entity.
4949///
4950/// \param IsPartialSpecialization whether this is a partial specialization of
4951/// a class template.
4952///
Douglas Gregord5cb8762009-10-07 00:13:32 +00004953/// \returns true if there was an error that we cannot recover from, false
4954/// otherwise.
4955static bool CheckTemplateSpecializationScope(Sema &S,
4956 NamedDecl *Specialized,
4957 NamedDecl *PrevDecl,
4958 SourceLocation Loc,
Douglas Gregor9302da62009-10-14 23:50:59 +00004959 bool IsPartialSpecialization) {
Douglas Gregord5cb8762009-10-07 00:13:32 +00004960 // Keep these "kind" numbers in sync with the %select statements in the
4961 // various diagnostics emitted by this routine.
4962 int EntityKind = 0;
Ted Kremenekfe62b062011-01-14 22:31:36 +00004963 if (isa<ClassTemplateDecl>(Specialized))
Douglas Gregord5cb8762009-10-07 00:13:32 +00004964 EntityKind = IsPartialSpecialization? 1 : 0;
Ted Kremenekfe62b062011-01-14 22:31:36 +00004965 else if (isa<FunctionTemplateDecl>(Specialized))
Douglas Gregord5cb8762009-10-07 00:13:32 +00004966 EntityKind = 2;
Ted Kremenekfe62b062011-01-14 22:31:36 +00004967 else if (isa<CXXMethodDecl>(Specialized))
Douglas Gregord5cb8762009-10-07 00:13:32 +00004968 EntityKind = 3;
4969 else if (isa<VarDecl>(Specialized))
4970 EntityKind = 4;
4971 else if (isa<RecordDecl>(Specialized))
4972 EntityKind = 5;
Richard Smith80ad52f2013-01-02 11:42:31 +00004973 else if (isa<EnumDecl>(Specialized) && S.getLangOpts().CPlusPlus11)
Richard Smith1af83c42012-03-23 03:33:32 +00004974 EntityKind = 6;
Douglas Gregord5cb8762009-10-07 00:13:32 +00004975 else {
Richard Smith1af83c42012-03-23 03:33:32 +00004976 S.Diag(Loc, diag::err_template_spec_unknown_kind)
Richard Smith80ad52f2013-01-02 11:42:31 +00004977 << S.getLangOpts().CPlusPlus11;
Douglas Gregor9302da62009-10-14 23:50:59 +00004978 S.Diag(Specialized->getLocation(), diag::note_specialized_entity);
Douglas Gregord5cb8762009-10-07 00:13:32 +00004979 return true;
4980 }
4981
Douglas Gregor88b70942009-02-25 22:02:03 +00004982 // C++ [temp.expl.spec]p2:
4983 // An explicit specialization shall be declared in the namespace
4984 // of which the template is a member, or, for member templates, in
4985 // the namespace of which the enclosing class or enclosing class
4986 // template is a member. An explicit specialization of a member
4987 // function, member class or static data member of a class
4988 // template shall be declared in the namespace of which the class
4989 // template is a member. Such a declaration may also be a
4990 // definition. If the declaration is not a definition, the
4991 // specialization may be defined later in the name- space in which
4992 // the explicit specialization was declared, or in a namespace
4993 // that encloses the one in which the explicit specialization was
4994 // declared.
Sebastian Redl7a126a42010-08-31 00:36:30 +00004995 if (S.CurContext->getRedeclContext()->isFunctionOrMethod()) {
Douglas Gregord5cb8762009-10-07 00:13:32 +00004996 S.Diag(Loc, diag::err_template_spec_decl_function_scope)
Douglas Gregor9302da62009-10-14 23:50:59 +00004997 << Specialized;
Douglas Gregor88b70942009-02-25 22:02:03 +00004998 return true;
4999 }
Douglas Gregor7974c3b2009-10-07 17:21:34 +00005000
Douglas Gregor0a407472009-10-07 17:30:37 +00005001 if (S.CurContext->isRecord() && !IsPartialSpecialization) {
David Blaikie4e4d0842012-03-11 07:00:24 +00005002 if (S.getLangOpts().MicrosoftExt) {
Francois Pichetaf0f4d02011-08-14 03:52:19 +00005003 // Do not warn for class scope explicit specialization during
5004 // instantiation, warning was already emitted during pattern
5005 // semantic analysis.
5006 if (!S.ActiveTemplateInstantiations.size())
5007 S.Diag(Loc, diag::ext_function_specialization_in_class)
5008 << Specialized;
5009 } else {
5010 S.Diag(Loc, diag::err_template_spec_decl_class_scope)
5011 << Specialized;
5012 return true;
5013 }
Douglas Gregor0a407472009-10-07 17:30:37 +00005014 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005015
Douglas Gregor8e0c1182011-10-20 16:41:18 +00005016 if (S.CurContext->isRecord() &&
5017 !S.CurContext->Equals(Specialized->getDeclContext())) {
5018 // Make sure that we're specializing in the right record context.
5019 // Otherwise, things can go horribly wrong.
5020 S.Diag(Loc, diag::err_template_spec_decl_class_scope)
5021 << Specialized;
5022 return true;
5023 }
5024
Douglas Gregor7974c3b2009-10-07 17:21:34 +00005025 // C++ [temp.class.spec]p6:
5026 // A class template partial specialization may be declared or redeclared
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005027 // in any namespace scope in which its definition may be defined (14.5.1
5028 // and 14.5.2).
Douglas Gregord5cb8762009-10-07 00:13:32 +00005029 bool ComplainedAboutScope = false;
Douglas Gregor8e0c1182011-10-20 16:41:18 +00005030 DeclContext *SpecializedContext
Douglas Gregord5cb8762009-10-07 00:13:32 +00005031 = Specialized->getDeclContext()->getEnclosingNamespaceContext();
Douglas Gregor7974c3b2009-10-07 17:21:34 +00005032 DeclContext *DC = S.CurContext->getEnclosingNamespaceContext();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005033 if ((!PrevDecl ||
Douglas Gregor9302da62009-10-14 23:50:59 +00005034 getTemplateSpecializationKind(PrevDecl) == TSK_Undeclared ||
5035 getTemplateSpecializationKind(PrevDecl) == TSK_ImplicitInstantiation)){
Douglas Gregor121dc9a2010-09-12 05:08:28 +00005036 // C++ [temp.exp.spec]p2:
5037 // An explicit specialization shall be declared in the namespace of which
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005038 // the template is a member, or, for member templates, in the namespace
Douglas Gregor121dc9a2010-09-12 05:08:28 +00005039 // of which the enclosing class or enclosing class template is a member.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005040 // An explicit specialization of a member function, member class or
5041 // static data member of a class template shall be declared in the
Douglas Gregor121dc9a2010-09-12 05:08:28 +00005042 // namespace of which the class template is a member.
5043 //
5044 // C++0x [temp.expl.spec]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005045 // An explicit specialization shall be declared in a namespace enclosing
Douglas Gregor121dc9a2010-09-12 05:08:28 +00005046 // the specialized template.
Richard Smithebaf0e62011-10-18 20:49:44 +00005047 if (!DC->InEnclosingNamespaceSetOf(SpecializedContext)) {
Richard Smith80ad52f2013-01-02 11:42:31 +00005048 bool IsCPlusPlus11Extension = DC->Encloses(SpecializedContext);
Richard Smithebaf0e62011-10-18 20:49:44 +00005049 if (isa<TranslationUnitDecl>(SpecializedContext)) {
Richard Smith80ad52f2013-01-02 11:42:31 +00005050 assert(!IsCPlusPlus11Extension &&
Richard Smithebaf0e62011-10-18 20:49:44 +00005051 "DC encloses TU but isn't in enclosing namespace set");
5052 S.Diag(Loc, diag::err_template_spec_decl_out_of_scope_global)
Douglas Gregora4d5de52010-09-12 05:24:55 +00005053 << EntityKind << Specialized;
Richard Smithebaf0e62011-10-18 20:49:44 +00005054 } else if (isa<NamespaceDecl>(SpecializedContext)) {
5055 int Diag;
Richard Smith80ad52f2013-01-02 11:42:31 +00005056 if (!IsCPlusPlus11Extension)
Richard Smithebaf0e62011-10-18 20:49:44 +00005057 Diag = diag::err_template_spec_decl_out_of_scope;
Richard Smith80ad52f2013-01-02 11:42:31 +00005058 else if (!S.getLangOpts().CPlusPlus11)
Richard Smithebaf0e62011-10-18 20:49:44 +00005059 Diag = diag::ext_template_spec_decl_out_of_scope;
5060 else
5061 Diag = diag::warn_cxx98_compat_template_spec_decl_out_of_scope;
5062 S.Diag(Loc, Diag)
5063 << EntityKind << Specialized << cast<NamedDecl>(SpecializedContext);
5064 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005065
Douglas Gregor9302da62009-10-14 23:50:59 +00005066 S.Diag(Specialized->getLocation(), diag::note_specialized_entity);
Richard Smithebaf0e62011-10-18 20:49:44 +00005067 ComplainedAboutScope =
Richard Smith80ad52f2013-01-02 11:42:31 +00005068 !(IsCPlusPlus11Extension && S.getLangOpts().CPlusPlus11);
Douglas Gregor88b70942009-02-25 22:02:03 +00005069 }
Douglas Gregor88b70942009-02-25 22:02:03 +00005070 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005071
5072 // Make sure that this redeclaration (or definition) occurs in an enclosing
Douglas Gregor9302da62009-10-14 23:50:59 +00005073 // namespace.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005074 // Note that HandleDeclarator() performs this check for explicit
Douglas Gregord5cb8762009-10-07 00:13:32 +00005075 // specializations of function templates, static data members, and member
5076 // functions, so we skip the check here for those kinds of entities.
5077 // FIXME: HandleDeclarator's diagnostics aren't quite as good, though.
Douglas Gregor7974c3b2009-10-07 17:21:34 +00005078 // Should we refactor that check, so that it occurs later?
5079 if (!ComplainedAboutScope && !DC->Encloses(SpecializedContext) &&
Douglas Gregor9302da62009-10-14 23:50:59 +00005080 !(isa<FunctionTemplateDecl>(Specialized) || isa<VarDecl>(Specialized) ||
5081 isa<FunctionDecl>(Specialized))) {
Douglas Gregord5cb8762009-10-07 00:13:32 +00005082 if (isa<TranslationUnitDecl>(SpecializedContext))
5083 S.Diag(Loc, diag::err_template_spec_redecl_global_scope)
5084 << EntityKind << Specialized;
5085 else if (isa<NamespaceDecl>(SpecializedContext))
5086 S.Diag(Loc, diag::err_template_spec_redecl_out_of_scope)
5087 << EntityKind << Specialized
5088 << cast<NamedDecl>(SpecializedContext);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005089
Douglas Gregor9302da62009-10-14 23:50:59 +00005090 S.Diag(Specialized->getLocation(), diag::note_specialized_entity);
Douglas Gregor88b70942009-02-25 22:02:03 +00005091 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005092
Douglas Gregord5cb8762009-10-07 00:13:32 +00005093 // FIXME: check for specialization-after-instantiation errors and such.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005094
Douglas Gregor88b70942009-02-25 22:02:03 +00005095 return false;
5096}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005097
Douglas Gregorbacb9492011-01-03 21:13:47 +00005098/// \brief Subroutine of Sema::CheckClassTemplatePartialSpecializationArgs
5099/// that checks non-type template partial specialization arguments.
5100static bool CheckNonTypeClassTemplatePartialSpecializationArgs(Sema &S,
5101 NonTypeTemplateParmDecl *Param,
5102 const TemplateArgument *Args,
5103 unsigned NumArgs) {
5104 for (unsigned I = 0; I != NumArgs; ++I) {
5105 if (Args[I].getKind() == TemplateArgument::Pack) {
5106 if (CheckNonTypeClassTemplatePartialSpecializationArgs(S, Param,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005107 Args[I].pack_begin(),
Douglas Gregorbacb9492011-01-03 21:13:47 +00005108 Args[I].pack_size()))
5109 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005110
Douglas Gregore94866f2009-06-12 21:21:02 +00005111 continue;
Douglas Gregorbacb9492011-01-03 21:13:47 +00005112 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005113
Eli Friedmand7a6b162012-09-26 02:36:12 +00005114 if (Args[I].getKind() != TemplateArgument::Expression)
Douglas Gregore94866f2009-06-12 21:21:02 +00005115 continue;
Eli Friedmand7a6b162012-09-26 02:36:12 +00005116
5117 Expr *ArgExpr = Args[I].getAsExpr();
Douglas Gregore94866f2009-06-12 21:21:02 +00005118
Douglas Gregor7a21fd42011-01-03 21:37:45 +00005119 // We can have a pack expansion of any of the bullets below.
Douglas Gregorbacb9492011-01-03 21:13:47 +00005120 if (PackExpansionExpr *Expansion = dyn_cast<PackExpansionExpr>(ArgExpr))
5121 ArgExpr = Expansion->getPattern();
Douglas Gregor54c53cc2011-01-04 23:35:54 +00005122
5123 // Strip off any implicit casts we added as part of type checking.
5124 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr))
5125 ArgExpr = ICE->getSubExpr();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005126
Douglas Gregore94866f2009-06-12 21:21:02 +00005127 // C++ [temp.class.spec]p8:
5128 // A non-type argument is non-specialized if it is the name of a
5129 // non-type parameter. All other non-type arguments are
5130 // specialized.
5131 //
5132 // Below, we check the two conditions that only apply to
5133 // specialized non-type arguments, so skip any non-specialized
5134 // arguments.
5135 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ArgExpr))
Douglas Gregor54c53cc2011-01-04 23:35:54 +00005136 if (isa<NonTypeTemplateParmDecl>(DRE->getDecl()))
Douglas Gregore94866f2009-06-12 21:21:02 +00005137 continue;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005138
Douglas Gregore94866f2009-06-12 21:21:02 +00005139 // C++ [temp.class.spec]p9:
5140 // Within the argument list of a class template partial
5141 // specialization, the following restrictions apply:
5142 // -- A partially specialized non-type argument expression
5143 // shall not involve a template parameter of the partial
5144 // specialization except when the argument expression is a
5145 // simple identifier.
5146 if (ArgExpr->isTypeDependent() || ArgExpr->isValueDependent()) {
Douglas Gregorbacb9492011-01-03 21:13:47 +00005147 S.Diag(ArgExpr->getLocStart(),
Douglas Gregore94866f2009-06-12 21:21:02 +00005148 diag::err_dependent_non_type_arg_in_partial_spec)
5149 << ArgExpr->getSourceRange();
5150 return true;
5151 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005152
Douglas Gregore94866f2009-06-12 21:21:02 +00005153 // -- The type of a template parameter corresponding to a
5154 // specialized non-type argument shall not be dependent on a
5155 // parameter of the specialization.
5156 if (Param->getType()->isDependentType()) {
Douglas Gregorbacb9492011-01-03 21:13:47 +00005157 S.Diag(ArgExpr->getLocStart(),
Douglas Gregore94866f2009-06-12 21:21:02 +00005158 diag::err_dependent_typed_non_type_arg_in_partial_spec)
5159 << Param->getType()
5160 << ArgExpr->getSourceRange();
Douglas Gregorbacb9492011-01-03 21:13:47 +00005161 S.Diag(Param->getLocation(), diag::note_template_param_here);
Douglas Gregore94866f2009-06-12 21:21:02 +00005162 return true;
5163 }
5164 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005165
Douglas Gregorbacb9492011-01-03 21:13:47 +00005166 return false;
5167}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005168
Douglas Gregorbacb9492011-01-03 21:13:47 +00005169/// \brief Check the non-type template arguments of a class template
5170/// partial specialization according to C++ [temp.class.spec]p9.
5171///
5172/// \param TemplateParams the template parameters of the primary class
5173/// template.
5174///
James Dennett1dfbd922012-06-14 21:40:34 +00005175/// \param TemplateArgs the template arguments of the class template
Douglas Gregorbacb9492011-01-03 21:13:47 +00005176/// partial specialization.
5177///
5178/// \returns true if there was an error, false otherwise.
5179static bool CheckClassTemplatePartialSpecializationArgs(Sema &S,
5180 TemplateParameterList *TemplateParams,
Chris Lattner5f9e2722011-07-23 10:55:15 +00005181 SmallVectorImpl<TemplateArgument> &TemplateArgs) {
Douglas Gregorbacb9492011-01-03 21:13:47 +00005182 const TemplateArgument *ArgList = TemplateArgs.data();
5183
5184 for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) {
5185 NonTypeTemplateParmDecl *Param
5186 = dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(I));
5187 if (!Param)
5188 continue;
5189
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005190 if (CheckNonTypeClassTemplatePartialSpecializationArgs(S, Param,
Douglas Gregorbacb9492011-01-03 21:13:47 +00005191 &ArgList[I], 1))
5192 return true;
5193 }
Douglas Gregore94866f2009-06-12 21:21:02 +00005194
5195 return false;
5196}
5197
John McCalld226f652010-08-21 09:40:31 +00005198DeclResult
John McCall0f434ec2009-07-31 02:45:11 +00005199Sema::ActOnClassTemplateSpecialization(Scope *S, unsigned TagSpec,
5200 TagUseKind TUK,
Mike Stump1eb44332009-09-09 15:08:12 +00005201 SourceLocation KWLoc,
Douglas Gregord023aec2011-09-09 20:53:38 +00005202 SourceLocation ModulePrivateLoc,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00005203 CXXScopeSpec &SS,
Douglas Gregor7532dc62009-03-30 22:58:21 +00005204 TemplateTy TemplateD,
Douglas Gregorcc636682009-02-17 23:15:12 +00005205 SourceLocation TemplateNameLoc,
5206 SourceLocation LAngleLoc,
Douglas Gregor40808ce2009-03-09 23:48:35 +00005207 ASTTemplateArgsPtr TemplateArgsIn,
Douglas Gregorcc636682009-02-17 23:15:12 +00005208 SourceLocation RAngleLoc,
5209 AttributeList *Attr,
5210 MultiTemplateParamsArg TemplateParameterLists) {
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005211 assert(TUK != TUK_Reference && "References are not specializations");
John McCallf1bbbb42009-09-04 01:14:41 +00005212
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005213 // NOTE: KWLoc is the location of the tag keyword. This will instead
5214 // store the location of the outermost template keyword in the declaration.
5215 SourceLocation TemplateKWLoc = TemplateParameterLists.size() > 0
Benjamin Kramer3fe198b2012-08-23 21:35:17 +00005216 ? TemplateParameterLists[0]->getTemplateLoc() : SourceLocation();
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005217
Douglas Gregorcc636682009-02-17 23:15:12 +00005218 // Find the class template we're specializing
Douglas Gregor7532dc62009-03-30 22:58:21 +00005219 TemplateName Name = TemplateD.getAsVal<TemplateName>();
Mike Stump1eb44332009-09-09 15:08:12 +00005220 ClassTemplateDecl *ClassTemplate
Douglas Gregor8b13c082009-11-12 00:46:20 +00005221 = dyn_cast_or_null<ClassTemplateDecl>(Name.getAsTemplateDecl());
5222
5223 if (!ClassTemplate) {
5224 Diag(TemplateNameLoc, diag::err_not_class_template_specialization)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005225 << (Name.getAsTemplateDecl() &&
Douglas Gregor8b13c082009-11-12 00:46:20 +00005226 isa<TemplateTemplateParmDecl>(Name.getAsTemplateDecl()));
5227 return true;
5228 }
Douglas Gregorcc636682009-02-17 23:15:12 +00005229
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005230 bool isExplicitSpecialization = false;
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005231 bool isPartialSpecialization = false;
5232
Douglas Gregor88b70942009-02-25 22:02:03 +00005233 // Check the validity of the template headers that introduce this
5234 // template.
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005235 // FIXME: We probably shouldn't complain about these headers for
5236 // friend declarations.
Douglas Gregor0167f3c2010-07-14 23:14:12 +00005237 bool Invalid = false;
Robert Wilhelm1169e2f2013-07-21 15:20:44 +00005238 TemplateParameterList *TemplateParams =
5239 MatchTemplateParametersToScopeSpecifier(
5240 TemplateNameLoc, TemplateNameLoc, SS, TemplateParameterLists,
5241 TUK == TUK_Friend, isExplicitSpecialization, Invalid);
Douglas Gregor0167f3c2010-07-14 23:14:12 +00005242 if (Invalid)
5243 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005244
Douglas Gregor05396e22009-08-25 17:23:04 +00005245 if (TemplateParams && TemplateParams->size() > 0) {
5246 isPartialSpecialization = true;
Douglas Gregor88b70942009-02-25 22:02:03 +00005247
Douglas Gregorb0ee93c2010-12-21 08:14:57 +00005248 if (TUK == TUK_Friend) {
5249 Diag(KWLoc, diag::err_partial_specialization_friend)
5250 << SourceRange(LAngleLoc, RAngleLoc);
5251 return true;
5252 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005253
Douglas Gregor05396e22009-08-25 17:23:04 +00005254 // C++ [temp.class.spec]p10:
5255 // The template parameter list of a specialization shall not
5256 // contain default template argument values.
5257 for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) {
5258 Decl *Param = TemplateParams->getParam(I);
5259 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
5260 if (TTP->hasDefaultArgument()) {
Mike Stump1eb44332009-09-09 15:08:12 +00005261 Diag(TTP->getDefaultArgumentLoc(),
Douglas Gregor05396e22009-08-25 17:23:04 +00005262 diag::err_default_arg_in_partial_spec);
John McCall833ca992009-10-29 08:12:44 +00005263 TTP->removeDefaultArgument();
Douglas Gregor05396e22009-08-25 17:23:04 +00005264 }
5265 } else if (NonTypeTemplateParmDecl *NTTP
5266 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
5267 if (Expr *DefArg = NTTP->getDefaultArgument()) {
Mike Stump1eb44332009-09-09 15:08:12 +00005268 Diag(NTTP->getDefaultArgumentLoc(),
Douglas Gregor05396e22009-08-25 17:23:04 +00005269 diag::err_default_arg_in_partial_spec)
5270 << DefArg->getSourceRange();
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00005271 NTTP->removeDefaultArgument();
Douglas Gregor05396e22009-08-25 17:23:04 +00005272 }
5273 } else {
5274 TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(Param);
Douglas Gregor788cd062009-11-11 01:00:40 +00005275 if (TTP->hasDefaultArgument()) {
5276 Diag(TTP->getDefaultArgument().getLocation(),
Douglas Gregor05396e22009-08-25 17:23:04 +00005277 diag::err_default_arg_in_partial_spec)
Douglas Gregor788cd062009-11-11 01:00:40 +00005278 << TTP->getDefaultArgument().getSourceRange();
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00005279 TTP->removeDefaultArgument();
Douglas Gregorba1ecb52009-06-12 19:43:02 +00005280 }
5281 }
5282 }
Douglas Gregora735b202009-10-13 14:39:41 +00005283 } else if (TemplateParams) {
5284 if (TUK == TUK_Friend)
5285 Diag(KWLoc, diag::err_template_spec_friend)
Douglas Gregor849b2432010-03-31 17:46:05 +00005286 << FixItHint::CreateRemoval(
Douglas Gregora735b202009-10-13 14:39:41 +00005287 SourceRange(TemplateParams->getTemplateLoc(),
5288 TemplateParams->getRAngleLoc()))
5289 << SourceRange(LAngleLoc, RAngleLoc);
5290 else
5291 isExplicitSpecialization = true;
5292 } else if (TUK != TUK_Friend) {
Douglas Gregor05396e22009-08-25 17:23:04 +00005293 Diag(KWLoc, diag::err_template_spec_needs_header)
Douglas Gregor849b2432010-03-31 17:46:05 +00005294 << FixItHint::CreateInsertion(KWLoc, "template<> ");
Argyrios Kyrtzidisd62d9012013-06-05 17:52:24 +00005295 TemplateKWLoc = KWLoc;
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005296 isExplicitSpecialization = true;
5297 }
Douglas Gregor88b70942009-02-25 22:02:03 +00005298
Douglas Gregorcc636682009-02-17 23:15:12 +00005299 // Check that the specialization uses the same tag kind as the
5300 // original template.
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005301 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
5302 assert(Kind != TTK_Enum && "Invalid enum tag in class template spec!");
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005303 if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(),
Richard Trieubbf34c02011-06-10 03:11:26 +00005304 Kind, TUK == TUK_Definition, KWLoc,
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005305 *ClassTemplate->getIdentifier())) {
Mike Stump1eb44332009-09-09 15:08:12 +00005306 Diag(KWLoc, diag::err_use_with_wrong_tag)
Douglas Gregora3a83512009-04-01 23:51:29 +00005307 << ClassTemplate
Douglas Gregor849b2432010-03-31 17:46:05 +00005308 << FixItHint::CreateReplacement(KWLoc,
Douglas Gregora3a83512009-04-01 23:51:29 +00005309 ClassTemplate->getTemplatedDecl()->getKindName());
Mike Stump1eb44332009-09-09 15:08:12 +00005310 Diag(ClassTemplate->getTemplatedDecl()->getLocation(),
Douglas Gregorcc636682009-02-17 23:15:12 +00005311 diag::note_previous_use);
5312 Kind = ClassTemplate->getTemplatedDecl()->getTagKind();
5313 }
5314
Douglas Gregor40808ce2009-03-09 23:48:35 +00005315 // Translate the parser's template argument list in our AST format.
John McCalld5532b62009-11-23 01:53:49 +00005316 TemplateArgumentListInfo TemplateArgs;
5317 TemplateArgs.setLAngleLoc(LAngleLoc);
5318 TemplateArgs.setRAngleLoc(RAngleLoc);
Douglas Gregor314b97f2009-11-10 19:49:08 +00005319 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
Douglas Gregor40808ce2009-03-09 23:48:35 +00005320
Douglas Gregor925910d2011-01-03 20:35:03 +00005321 // Check for unexpanded parameter packs in any of the template arguments.
5322 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005323 if (DiagnoseUnexpandedParameterPack(TemplateArgs[I],
Douglas Gregor925910d2011-01-03 20:35:03 +00005324 UPPC_PartialSpecialization))
5325 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005326
Douglas Gregorcc636682009-02-17 23:15:12 +00005327 // Check that the template argument list is well-formed for this
5328 // template.
Chris Lattner5f9e2722011-07-23 10:55:15 +00005329 SmallVector<TemplateArgument, 4> Converted;
John McCalld5532b62009-11-23 01:53:49 +00005330 if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc,
5331 TemplateArgs, false, Converted))
Douglas Gregor212e81c2009-03-25 00:13:59 +00005332 return true;
Douglas Gregorcc636682009-02-17 23:15:12 +00005333
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005334 // Find the class template (partial) specialization declaration that
Douglas Gregorcc636682009-02-17 23:15:12 +00005335 // corresponds to these arguments.
Douglas Gregorba1ecb52009-06-12 19:43:02 +00005336 if (isPartialSpecialization) {
Douglas Gregorbacb9492011-01-03 21:13:47 +00005337 if (CheckClassTemplatePartialSpecializationArgs(*this,
Douglas Gregore94866f2009-06-12 21:21:02 +00005338 ClassTemplate->getTemplateParameters(),
Douglas Gregorb9c66312010-12-23 17:13:55 +00005339 Converted))
Douglas Gregore94866f2009-06-12 21:21:02 +00005340 return true;
5341
Douglas Gregor561f8122011-07-01 01:22:09 +00005342 bool InstantiationDependent;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005343 if (!Name.isDependent() &&
Douglas Gregorde090962010-02-09 00:37:32 +00005344 !TemplateSpecializationType::anyDependentTemplateArguments(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005345 TemplateArgs.getArgumentArray(),
Douglas Gregor561f8122011-07-01 01:22:09 +00005346 TemplateArgs.size(),
5347 InstantiationDependent)) {
Douglas Gregorde090962010-02-09 00:37:32 +00005348 Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized)
5349 << ClassTemplate->getDeclName();
5350 isPartialSpecialization = false;
Douglas Gregorde090962010-02-09 00:37:32 +00005351 }
5352 }
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005353
Douglas Gregorcc636682009-02-17 23:15:12 +00005354 void *InsertPos = 0;
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005355 ClassTemplateSpecializationDecl *PrevDecl = 0;
5356
5357 if (isPartialSpecialization)
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005358 // FIXME: Template parameter list matters, too
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005359 PrevDecl
Douglas Gregor910f8002010-11-07 23:05:16 +00005360 = ClassTemplate->findPartialSpecialization(Converted.data(),
5361 Converted.size(),
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005362 InsertPos);
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005363 else
5364 PrevDecl
Douglas Gregor910f8002010-11-07 23:05:16 +00005365 = ClassTemplate->findSpecialization(Converted.data(),
5366 Converted.size(), InsertPos);
Douglas Gregorcc636682009-02-17 23:15:12 +00005367
5368 ClassTemplateSpecializationDecl *Specialization = 0;
5369
Douglas Gregor88b70942009-02-25 22:02:03 +00005370 // Check whether we can declare a class template specialization in
5371 // the current scope.
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005372 if (TUK != TUK_Friend &&
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005373 CheckTemplateSpecializationScope(*this, ClassTemplate, PrevDecl,
5374 TemplateNameLoc,
Douglas Gregor9302da62009-10-14 23:50:59 +00005375 isPartialSpecialization))
Douglas Gregor212e81c2009-03-25 00:13:59 +00005376 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005377
Douglas Gregorb88e8882009-07-30 17:40:51 +00005378 // The canonical type
5379 QualType CanonType;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005380 if (PrevDecl &&
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005381 (PrevDecl->getSpecializationKind() == TSK_Undeclared ||
Douglas Gregorde090962010-02-09 00:37:32 +00005382 TUK == TUK_Friend)) {
Douglas Gregorcc636682009-02-17 23:15:12 +00005383 // Since the only prior class template specialization with these
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005384 // arguments was referenced but not declared, or we're only
5385 // referencing this specialization as a friend, reuse that
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005386 // declaration node as our own, updating its source location and
5387 // the list of outer template parameters to reflect our new declaration.
Douglas Gregorcc636682009-02-17 23:15:12 +00005388 Specialization = PrevDecl;
Douglas Gregor6bc9f7e2009-02-25 22:18:32 +00005389 Specialization->setLocation(TemplateNameLoc);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005390 if (TemplateParameterLists.size() > 0) {
5391 Specialization->setTemplateParameterListsInfo(Context,
5392 TemplateParameterLists.size(),
Benjamin Kramer5354e772012-08-23 23:38:35 +00005393 TemplateParameterLists.data());
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005394 }
Douglas Gregorcc636682009-02-17 23:15:12 +00005395 PrevDecl = 0;
Douglas Gregorb88e8882009-07-30 17:40:51 +00005396 CanonType = Context.getTypeDeclType(Specialization);
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005397 } else if (isPartialSpecialization) {
Douglas Gregorb88e8882009-07-30 17:40:51 +00005398 // Build the canonical type that describes the converted template
5399 // arguments of the class template partial specialization.
Douglas Gregorde090962010-02-09 00:37:32 +00005400 TemplateName CanonTemplate = Context.getCanonicalTemplateName(Name);
5401 CanonType = Context.getTemplateSpecializationType(CanonTemplate,
Douglas Gregorb9c66312010-12-23 17:13:55 +00005402 Converted.data(),
5403 Converted.size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005404
5405 if (Context.hasSameType(CanonType,
Douglas Gregorb9c66312010-12-23 17:13:55 +00005406 ClassTemplate->getInjectedClassNameSpecialization())) {
5407 // C++ [temp.class.spec]p9b3:
5408 //
5409 // -- The argument list of the specialization shall not be identical
5410 // to the implicit argument list of the primary template.
5411 Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template)
Douglas Gregor8d267c52011-09-09 02:06:17 +00005412 << (TUK == TUK_Definition)
5413 << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc));
Douglas Gregorb9c66312010-12-23 17:13:55 +00005414 return CheckClassTemplate(S, TagSpec, TUK, KWLoc, SS,
5415 ClassTemplate->getIdentifier(),
5416 TemplateNameLoc,
5417 Attr,
5418 TemplateParams,
Douglas Gregore7612302011-09-09 19:05:14 +00005419 AS_none, /*ModulePrivateLoc=*/SourceLocation(),
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005420 TemplateParameterLists.size() - 1,
Benjamin Kramer5354e772012-08-23 23:38:35 +00005421 TemplateParameterLists.data());
Douglas Gregorb9c66312010-12-23 17:13:55 +00005422 }
Douglas Gregorb88e8882009-07-30 17:40:51 +00005423
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005424 // Create a new class template partial specialization declaration node.
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005425 ClassTemplatePartialSpecializationDecl *PrevPartial
5426 = cast_or_null<ClassTemplatePartialSpecializationDecl>(PrevDecl);
Douglas Gregordc60c1e2010-04-30 05:56:50 +00005427 unsigned SequenceNumber = PrevPartial? PrevPartial->getSequenceNumber()
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005428 : ClassTemplate->getNextPartialSpecSequenceNumber();
Mike Stump1eb44332009-09-09 15:08:12 +00005429 ClassTemplatePartialSpecializationDecl *Partial
Douglas Gregor13c85772010-05-06 00:28:52 +00005430 = ClassTemplatePartialSpecializationDecl::Create(Context, Kind,
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005431 ClassTemplate->getDeclContext(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00005432 KWLoc, TemplateNameLoc,
Anders Carlsson91fdf6f2009-06-05 04:06:48 +00005433 TemplateParams,
5434 ClassTemplate,
Douglas Gregor910f8002010-11-07 23:05:16 +00005435 Converted.data(),
5436 Converted.size(),
John McCalld5532b62009-11-23 01:53:49 +00005437 TemplateArgs,
John McCall3cb0ebd2010-03-10 03:28:59 +00005438 CanonType,
Douglas Gregordc60c1e2010-04-30 05:56:50 +00005439 PrevPartial,
5440 SequenceNumber);
John McCallb6217662010-03-15 10:12:16 +00005441 SetNestedNameSpecifier(Partial, SS);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005442 if (TemplateParameterLists.size() > 1 && SS.isSet()) {
Douglas Gregorc722ea42010-06-15 17:44:38 +00005443 Partial->setTemplateParameterListsInfo(Context,
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005444 TemplateParameterLists.size() - 1,
Benjamin Kramer5354e772012-08-23 23:38:35 +00005445 TemplateParameterLists.data());
Abramo Bagnara9b934882010-06-12 08:15:14 +00005446 }
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005447
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005448 if (!PrevPartial)
5449 ClassTemplate->AddPartialSpecialization(Partial, InsertPos);
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005450 Specialization = Partial;
Douglas Gregor031a5882009-06-13 00:26:55 +00005451
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005452 // If we are providing an explicit specialization of a member class
Douglas Gregored9c0f92009-10-29 00:04:11 +00005453 // template specialization, make a note of that.
5454 if (PrevPartial && PrevPartial->getInstantiatedFromMember())
5455 PrevPartial->setMemberSpecialization();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005456
Douglas Gregor031a5882009-06-13 00:26:55 +00005457 // Check that all of the template parameters of the class template
5458 // partial specialization are deducible from the template
5459 // arguments. If not, this class template partial specialization
5460 // will never be used.
Benjamin Kramer013b3662012-01-30 16:17:39 +00005461 llvm::SmallBitVector DeducibleParams(TemplateParams->size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005462 MarkUsedTemplateParameters(Partial->getTemplateArgs(), true,
Douglas Gregored9c0f92009-10-29 00:04:11 +00005463 TemplateParams->getDepth(),
Douglas Gregore73bb602009-09-14 21:25:05 +00005464 DeducibleParams);
Douglas Gregor031a5882009-06-13 00:26:55 +00005465
Benjamin Kramer013b3662012-01-30 16:17:39 +00005466 if (!DeducibleParams.all()) {
5467 unsigned NumNonDeducible = DeducibleParams.size()-DeducibleParams.count();
Douglas Gregor031a5882009-06-13 00:26:55 +00005468 Diag(TemplateNameLoc, diag::warn_partial_specs_not_deducible)
5469 << (NumNonDeducible > 1)
5470 << SourceRange(TemplateNameLoc, RAngleLoc);
5471 for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) {
5472 if (!DeducibleParams[I]) {
5473 NamedDecl *Param = cast<NamedDecl>(TemplateParams->getParam(I));
5474 if (Param->getDeclName())
Mike Stump1eb44332009-09-09 15:08:12 +00005475 Diag(Param->getLocation(),
Douglas Gregor031a5882009-06-13 00:26:55 +00005476 diag::note_partial_spec_unused_parameter)
5477 << Param->getDeclName();
5478 else
Mike Stump1eb44332009-09-09 15:08:12 +00005479 Diag(Param->getLocation(),
Douglas Gregor031a5882009-06-13 00:26:55 +00005480 diag::note_partial_spec_unused_parameter)
Benjamin Kramer476d8b82010-08-11 14:47:12 +00005481 << "<anonymous>";
Douglas Gregor031a5882009-06-13 00:26:55 +00005482 }
5483 }
5484 }
Douglas Gregorcc636682009-02-17 23:15:12 +00005485 } else {
5486 // Create a new class template specialization declaration node for
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005487 // this explicit specialization or friend declaration.
Douglas Gregorcc636682009-02-17 23:15:12 +00005488 Specialization
Douglas Gregor13c85772010-05-06 00:28:52 +00005489 = ClassTemplateSpecializationDecl::Create(Context, Kind,
Douglas Gregorcc636682009-02-17 23:15:12 +00005490 ClassTemplate->getDeclContext(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00005491 KWLoc, TemplateNameLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00005492 ClassTemplate,
Douglas Gregor910f8002010-11-07 23:05:16 +00005493 Converted.data(),
5494 Converted.size(),
Douglas Gregorcc636682009-02-17 23:15:12 +00005495 PrevDecl);
John McCallb6217662010-03-15 10:12:16 +00005496 SetNestedNameSpecifier(Specialization, SS);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005497 if (TemplateParameterLists.size() > 0) {
Douglas Gregorc722ea42010-06-15 17:44:38 +00005498 Specialization->setTemplateParameterListsInfo(Context,
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005499 TemplateParameterLists.size(),
Benjamin Kramer5354e772012-08-23 23:38:35 +00005500 TemplateParameterLists.data());
Abramo Bagnara9b934882010-06-12 08:15:14 +00005501 }
Douglas Gregorcc636682009-02-17 23:15:12 +00005502
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005503 if (!PrevDecl)
5504 ClassTemplate->AddSpecialization(Specialization, InsertPos);
Douglas Gregorb88e8882009-07-30 17:40:51 +00005505
5506 CanonType = Context.getTypeDeclType(Specialization);
Douglas Gregorcc636682009-02-17 23:15:12 +00005507 }
5508
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005509 // C++ [temp.expl.spec]p6:
5510 // If a template, a member template or the member of a class template is
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005511 // explicitly specialized then that specialization shall be declared
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005512 // before the first use of that specialization that would cause an implicit
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005513 // instantiation to take place, in every translation unit in which such a
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005514 // use occurs; no diagnostic is required.
5515 if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) {
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005516 bool Okay = false;
Douglas Gregorf785a7d2012-01-14 15:55:47 +00005517 for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) {
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005518 // Is there any previous explicit specialization declaration?
5519 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) {
5520 Okay = true;
5521 break;
5522 }
5523 }
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005524
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005525 if (!Okay) {
5526 SourceRange Range(TemplateNameLoc, RAngleLoc);
5527 Diag(TemplateNameLoc, diag::err_specialization_after_instantiation)
5528 << Context.getTypeDeclType(Specialization) << Range;
5529
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005530 Diag(PrevDecl->getPointOfInstantiation(),
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005531 diag::note_instantiation_required_here)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005532 << (PrevDecl->getTemplateSpecializationKind()
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005533 != TSK_ImplicitInstantiation);
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005534 return true;
5535 }
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005536 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005537
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005538 // If this is not a friend, note that this is an explicit specialization.
5539 if (TUK != TUK_Friend)
5540 Specialization->setSpecializationKind(TSK_ExplicitSpecialization);
Douglas Gregorcc636682009-02-17 23:15:12 +00005541
5542 // Check that this isn't a redefinition of this specialization.
John McCall0f434ec2009-07-31 02:45:11 +00005543 if (TUK == TUK_Definition) {
Douglas Gregor952b0172010-02-11 01:04:33 +00005544 if (RecordDecl *Def = Specialization->getDefinition()) {
Douglas Gregorcc636682009-02-17 23:15:12 +00005545 SourceRange Range(TemplateNameLoc, RAngleLoc);
Mike Stump1eb44332009-09-09 15:08:12 +00005546 Diag(TemplateNameLoc, diag::err_redefinition)
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005547 << Context.getTypeDeclType(Specialization) << Range;
Douglas Gregorcc636682009-02-17 23:15:12 +00005548 Diag(Def->getLocation(), diag::note_previous_definition);
5549 Specialization->setInvalidDecl();
Douglas Gregor212e81c2009-03-25 00:13:59 +00005550 return true;
Douglas Gregorcc636682009-02-17 23:15:12 +00005551 }
5552 }
5553
John McCall7f1b9872010-12-18 03:30:47 +00005554 if (Attr)
5555 ProcessDeclAttributeList(S, Specialization, Attr);
5556
Richard Smith0652c352012-08-17 03:20:55 +00005557 // Add alignment attributes if necessary; these attributes are checked when
5558 // the ASTContext lays out the structure.
5559 if (TUK == TUK_Definition) {
5560 AddAlignmentAttributesForRecord(Specialization);
5561 AddMsStructLayoutForRecord(Specialization);
5562 }
5563
Douglas Gregord023aec2011-09-09 20:53:38 +00005564 if (ModulePrivateLoc.isValid())
5565 Diag(Specialization->getLocation(), diag::err_module_private_specialization)
5566 << (isPartialSpecialization? 1 : 0)
5567 << FixItHint::CreateRemoval(ModulePrivateLoc);
5568
Douglas Gregorfc705b82009-02-26 22:19:44 +00005569 // Build the fully-sugared type for this class template
5570 // specialization as the user wrote in the specialization
5571 // itself. This means that we'll pretty-print the type retrieved
5572 // from the specialization's declaration the way that the user
5573 // actually wrote the specialization, rather than formatting the
5574 // name based on the "canonical" representation used to store the
5575 // template arguments in the specialization.
John McCall3cb0ebd2010-03-10 03:28:59 +00005576 TypeSourceInfo *WrittenTy
5577 = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc,
5578 TemplateArgs, CanonType);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005579 if (TUK != TUK_Friend) {
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005580 Specialization->setTypeAsWritten(WrittenTy);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005581 Specialization->setTemplateKeywordLoc(TemplateKWLoc);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005582 }
Douglas Gregorcc636682009-02-17 23:15:12 +00005583
Douglas Gregor6bc9f7e2009-02-25 22:18:32 +00005584 // C++ [temp.expl.spec]p9:
5585 // A template explicit specialization is in the scope of the
5586 // namespace in which the template was defined.
5587 //
5588 // We actually implement this paragraph where we set the semantic
5589 // context (in the creation of the ClassTemplateSpecializationDecl),
5590 // but we also maintain the lexical context where the actual
5591 // definition occurs.
Douglas Gregorcc636682009-02-17 23:15:12 +00005592 Specialization->setLexicalDeclContext(CurContext);
Mike Stump1eb44332009-09-09 15:08:12 +00005593
Douglas Gregorcc636682009-02-17 23:15:12 +00005594 // We may be starting the definition of this specialization.
John McCall0f434ec2009-07-31 02:45:11 +00005595 if (TUK == TUK_Definition)
Douglas Gregorcc636682009-02-17 23:15:12 +00005596 Specialization->startDefinition();
5597
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005598 if (TUK == TUK_Friend) {
5599 FriendDecl *Friend = FriendDecl::Create(Context, CurContext,
5600 TemplateNameLoc,
John McCall32f2fb52010-03-25 18:04:51 +00005601 WrittenTy,
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005602 /*FIXME:*/KWLoc);
5603 Friend->setAccess(AS_public);
5604 CurContext->addDecl(Friend);
5605 } else {
5606 // Add the specialization into its lexical context, so that it can
5607 // be seen when iterating through the list of declarations in that
5608 // context. However, specializations are not found by name lookup.
5609 CurContext->addDecl(Specialization);
5610 }
John McCalld226f652010-08-21 09:40:31 +00005611 return Specialization;
Douglas Gregorcc636682009-02-17 23:15:12 +00005612}
Douglas Gregord57959a2009-03-27 23:10:48 +00005613
John McCalld226f652010-08-21 09:40:31 +00005614Decl *Sema::ActOnTemplateDeclarator(Scope *S,
Douglas Gregore542c862009-06-23 23:11:28 +00005615 MultiTemplateParamsArg TemplateParameterLists,
John McCalld226f652010-08-21 09:40:31 +00005616 Declarator &D) {
Benjamin Kramer3fe198b2012-08-23 21:35:17 +00005617 Decl *NewDecl = HandleDeclarator(S, D, TemplateParameterLists);
Dmitri Gribenko96b09862012-07-31 22:37:06 +00005618 ActOnDocumentableDecl(NewDecl);
5619 return NewDecl;
Douglas Gregore542c862009-06-23 23:11:28 +00005620}
5621
John McCalld226f652010-08-21 09:40:31 +00005622Decl *Sema::ActOnStartOfFunctionTemplateDef(Scope *FnBodyScope,
Douglas Gregor52591bf2009-06-24 00:54:41 +00005623 MultiTemplateParamsArg TemplateParameterLists,
John McCalld226f652010-08-21 09:40:31 +00005624 Declarator &D) {
Douglas Gregor52591bf2009-06-24 00:54:41 +00005625 assert(getCurFunctionDecl() == 0 && "Function parsing confused");
Abramo Bagnara075f8f12010-12-10 16:29:40 +00005626 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
Mike Stump1eb44332009-09-09 15:08:12 +00005627
Douglas Gregor52591bf2009-06-24 00:54:41 +00005628 if (FTI.hasPrototype) {
Mike Stump1eb44332009-09-09 15:08:12 +00005629 // FIXME: Diagnose arguments without names in C.
Douglas Gregor52591bf2009-06-24 00:54:41 +00005630 }
Mike Stump1eb44332009-09-09 15:08:12 +00005631
Douglas Gregor52591bf2009-06-24 00:54:41 +00005632 Scope *ParentScope = FnBodyScope->getParent();
Mike Stump1eb44332009-09-09 15:08:12 +00005633
Douglas Gregor45fa5602011-11-07 20:56:01 +00005634 D.setFunctionDefinitionKind(FDK_Definition);
John McCalld226f652010-08-21 09:40:31 +00005635 Decl *DP = HandleDeclarator(ParentScope, D,
Benjamin Kramer3fe198b2012-08-23 21:35:17 +00005636 TemplateParameterLists);
Argyrios Kyrtzidis3abc7682012-12-14 06:53:58 +00005637 return ActOnStartOfFunctionDef(FnBodyScope, DP);
Douglas Gregor52591bf2009-06-24 00:54:41 +00005638}
5639
John McCall75042392010-02-11 01:33:53 +00005640/// \brief Strips various properties off an implicit instantiation
5641/// that has just been explicitly specialized.
5642static void StripImplicitInstantiation(NamedDecl *D) {
Sean Huntcf807c42010-08-18 23:23:40 +00005643 D->dropAttrs();
John McCall75042392010-02-11 01:33:53 +00005644
5645 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
5646 FD->setInlineSpecified(false);
Jordan Rose09189892013-03-08 22:25:36 +00005647
5648 for (FunctionDecl::param_iterator I = FD->param_begin(),
5649 E = FD->param_end();
5650 I != E; ++I)
5651 (*I)->dropAttrs();
John McCall75042392010-02-11 01:33:53 +00005652 }
5653}
5654
Nico Weberd1d512a2012-01-09 19:52:25 +00005655/// \brief Compute the diagnostic location for an explicit instantiation
5656// declaration or definition.
5657static SourceLocation DiagLocForExplicitInstantiation(
Douglas Gregorf785a7d2012-01-14 15:55:47 +00005658 NamedDecl* D, SourceLocation PointOfInstantiation) {
Nico Weberd1d512a2012-01-09 19:52:25 +00005659 // Explicit instantiations following a specialization have no effect and
5660 // hence no PointOfInstantiation. In that case, walk decl backwards
5661 // until a valid name loc is found.
5662 SourceLocation PrevDiagLoc = PointOfInstantiation;
Douglas Gregorf785a7d2012-01-14 15:55:47 +00005663 for (Decl *Prev = D; Prev && !PrevDiagLoc.isValid();
5664 Prev = Prev->getPreviousDecl()) {
Nico Weberd1d512a2012-01-09 19:52:25 +00005665 PrevDiagLoc = Prev->getLocation();
5666 }
5667 assert(PrevDiagLoc.isValid() &&
5668 "Explicit instantiation without point of instantiation?");
5669 return PrevDiagLoc;
5670}
5671
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005672/// \brief Diagnose cases where we have an explicit template specialization
Douglas Gregor454885e2009-10-15 15:54:05 +00005673/// before/after an explicit template instantiation, producing diagnostics
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005674/// for those cases where they are required and determining whether the
Douglas Gregor454885e2009-10-15 15:54:05 +00005675/// new specialization/instantiation will have any effect.
5676///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005677/// \param NewLoc the location of the new explicit specialization or
Douglas Gregor454885e2009-10-15 15:54:05 +00005678/// instantiation.
5679///
5680/// \param NewTSK the kind of the new explicit specialization or instantiation.
5681///
5682/// \param PrevDecl the previous declaration of the entity.
5683///
5684/// \param PrevTSK the kind of the old explicit specialization or instantiatin.
5685///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005686/// \param PrevPointOfInstantiation if valid, indicates where the previus
Douglas Gregor454885e2009-10-15 15:54:05 +00005687/// declaration was instantiated (either implicitly or explicitly).
5688///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005689/// \param HasNoEffect will be set to true to indicate that the new
Douglas Gregor454885e2009-10-15 15:54:05 +00005690/// specialization or instantiation has no effect and should be ignored.
5691///
5692/// \returns true if there was an error that should prevent the introduction of
5693/// the new declaration into the AST, false otherwise.
Douglas Gregor0d035142009-10-27 18:42:08 +00005694bool
5695Sema::CheckSpecializationInstantiationRedecl(SourceLocation NewLoc,
5696 TemplateSpecializationKind NewTSK,
5697 NamedDecl *PrevDecl,
5698 TemplateSpecializationKind PrevTSK,
5699 SourceLocation PrevPointOfInstantiation,
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005700 bool &HasNoEffect) {
5701 HasNoEffect = false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005702
Douglas Gregor454885e2009-10-15 15:54:05 +00005703 switch (NewTSK) {
5704 case TSK_Undeclared:
5705 case TSK_ImplicitInstantiation:
David Blaikieb219cfc2011-09-23 05:06:16 +00005706 llvm_unreachable("Don't check implicit instantiations here");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005707
Douglas Gregor454885e2009-10-15 15:54:05 +00005708 case TSK_ExplicitSpecialization:
5709 switch (PrevTSK) {
5710 case TSK_Undeclared:
5711 case TSK_ExplicitSpecialization:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005712 // Okay, we're just specializing something that is either already
Douglas Gregor454885e2009-10-15 15:54:05 +00005713 // explicitly specialized or has merely been mentioned without any
5714 // instantiation.
5715 return false;
5716
5717 case TSK_ImplicitInstantiation:
5718 if (PrevPointOfInstantiation.isInvalid()) {
5719 // The declaration itself has not actually been instantiated, so it is
5720 // still okay to specialize it.
John McCall75042392010-02-11 01:33:53 +00005721 StripImplicitInstantiation(PrevDecl);
Douglas Gregor454885e2009-10-15 15:54:05 +00005722 return false;
5723 }
5724 // Fall through
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005725
Douglas Gregor454885e2009-10-15 15:54:05 +00005726 case TSK_ExplicitInstantiationDeclaration:
5727 case TSK_ExplicitInstantiationDefinition:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005728 assert((PrevTSK == TSK_ImplicitInstantiation ||
5729 PrevPointOfInstantiation.isValid()) &&
Douglas Gregor454885e2009-10-15 15:54:05 +00005730 "Explicit instantiation without point of instantiation?");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005731
Douglas Gregor454885e2009-10-15 15:54:05 +00005732 // C++ [temp.expl.spec]p6:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005733 // If a template, a member template or the member of a class template
Douglas Gregor454885e2009-10-15 15:54:05 +00005734 // is explicitly specialized then that specialization shall be declared
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005735 // before the first use of that specialization that would cause an
Douglas Gregor454885e2009-10-15 15:54:05 +00005736 // implicit instantiation to take place, in every translation unit in
5737 // which such a use occurs; no diagnostic is required.
Douglas Gregorf785a7d2012-01-14 15:55:47 +00005738 for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) {
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005739 // Is there any previous explicit specialization declaration?
5740 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization)
5741 return false;
5742 }
5743
Douglas Gregor0d035142009-10-27 18:42:08 +00005744 Diag(NewLoc, diag::err_specialization_after_instantiation)
Douglas Gregor454885e2009-10-15 15:54:05 +00005745 << PrevDecl;
Douglas Gregor0d035142009-10-27 18:42:08 +00005746 Diag(PrevPointOfInstantiation, diag::note_instantiation_required_here)
Douglas Gregor454885e2009-10-15 15:54:05 +00005747 << (PrevTSK != TSK_ImplicitInstantiation);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005748
Douglas Gregor454885e2009-10-15 15:54:05 +00005749 return true;
5750 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005751
Douglas Gregor454885e2009-10-15 15:54:05 +00005752 case TSK_ExplicitInstantiationDeclaration:
5753 switch (PrevTSK) {
5754 case TSK_ExplicitInstantiationDeclaration:
5755 // This explicit instantiation declaration is redundant (that's okay).
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005756 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00005757 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005758
Douglas Gregor454885e2009-10-15 15:54:05 +00005759 case TSK_Undeclared:
5760 case TSK_ImplicitInstantiation:
5761 // We're explicitly instantiating something that may have already been
5762 // implicitly instantiated; that's fine.
5763 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005764
Douglas Gregor454885e2009-10-15 15:54:05 +00005765 case TSK_ExplicitSpecialization:
5766 // C++0x [temp.explicit]p4:
5767 // For a given set of template parameters, if an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005768 // of a template appears after a declaration of an explicit
Douglas Gregor454885e2009-10-15 15:54:05 +00005769 // specialization for that template, the explicit instantiation has no
5770 // effect.
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005771 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00005772 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005773
Douglas Gregor454885e2009-10-15 15:54:05 +00005774 case TSK_ExplicitInstantiationDefinition:
5775 // C++0x [temp.explicit]p10:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005776 // If an entity is the subject of both an explicit instantiation
5777 // declaration and an explicit instantiation definition in the same
Douglas Gregor454885e2009-10-15 15:54:05 +00005778 // translation unit, the definition shall follow the declaration.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005779 Diag(NewLoc,
Douglas Gregor0d035142009-10-27 18:42:08 +00005780 diag::err_explicit_instantiation_declaration_after_definition);
Nico Weberff91d242011-12-23 20:58:04 +00005781
5782 // Explicit instantiations following a specialization have no effect and
5783 // hence no PrevPointOfInstantiation. In that case, walk decl backwards
5784 // until a valid name loc is found.
Nico Weberd1d512a2012-01-09 19:52:25 +00005785 Diag(DiagLocForExplicitInstantiation(PrevDecl, PrevPointOfInstantiation),
5786 diag::note_explicit_instantiation_definition_here);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005787 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00005788 return false;
5789 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005790
Douglas Gregor454885e2009-10-15 15:54:05 +00005791 case TSK_ExplicitInstantiationDefinition:
5792 switch (PrevTSK) {
5793 case TSK_Undeclared:
5794 case TSK_ImplicitInstantiation:
5795 // We're explicitly instantiating something that may have already been
5796 // implicitly instantiated; that's fine.
5797 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005798
Douglas Gregor454885e2009-10-15 15:54:05 +00005799 case TSK_ExplicitSpecialization:
5800 // C++ DR 259, C++0x [temp.explicit]p4:
5801 // For a given set of template parameters, if an explicit
5802 // instantiation of a template appears after a declaration of
5803 // an explicit specialization for that template, the explicit
5804 // instantiation has no effect.
5805 //
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005806 // In C++98/03 mode, we only give an extension warning here, because it
Douglas Gregorc42b6522010-04-09 21:02:29 +00005807 // is not harmful to try to explicitly instantiate something that
Douglas Gregor454885e2009-10-15 15:54:05 +00005808 // has been explicitly specialized.
Richard Smith80ad52f2013-01-02 11:42:31 +00005809 Diag(NewLoc, getLangOpts().CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00005810 diag::warn_cxx98_compat_explicit_instantiation_after_specialization :
5811 diag::ext_explicit_instantiation_after_specialization)
5812 << PrevDecl;
5813 Diag(PrevDecl->getLocation(),
5814 diag::note_previous_template_specialization);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005815 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00005816 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005817
Douglas Gregor454885e2009-10-15 15:54:05 +00005818 case TSK_ExplicitInstantiationDeclaration:
5819 // We're explicity instantiating a definition for something for which we
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005820 // were previously asked to suppress instantiations. That's fine.
Nico Weberff91d242011-12-23 20:58:04 +00005821
5822 // C++0x [temp.explicit]p4:
5823 // For a given set of template parameters, if an explicit instantiation
5824 // of a template appears after a declaration of an explicit
5825 // specialization for that template, the explicit instantiation has no
5826 // effect.
Douglas Gregorf785a7d2012-01-14 15:55:47 +00005827 for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) {
Nico Weberff91d242011-12-23 20:58:04 +00005828 // Is there any previous explicit specialization declaration?
5829 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) {
5830 HasNoEffect = true;
5831 break;
5832 }
5833 }
5834
Douglas Gregor454885e2009-10-15 15:54:05 +00005835 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005836
Douglas Gregor454885e2009-10-15 15:54:05 +00005837 case TSK_ExplicitInstantiationDefinition:
5838 // C++0x [temp.spec]p5:
5839 // For a given template and a given set of template-arguments,
5840 // - an explicit instantiation definition shall appear at most once
5841 // in a program,
Douglas Gregor0d035142009-10-27 18:42:08 +00005842 Diag(NewLoc, diag::err_explicit_instantiation_duplicate)
Douglas Gregor454885e2009-10-15 15:54:05 +00005843 << PrevDecl;
Nico Weberd1d512a2012-01-09 19:52:25 +00005844 Diag(DiagLocForExplicitInstantiation(PrevDecl, PrevPointOfInstantiation),
Douglas Gregor0d035142009-10-27 18:42:08 +00005845 diag::note_previous_explicit_instantiation);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005846 HasNoEffect = true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005847 return false;
Douglas Gregor454885e2009-10-15 15:54:05 +00005848 }
Douglas Gregor454885e2009-10-15 15:54:05 +00005849 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005850
David Blaikieb219cfc2011-09-23 05:06:16 +00005851 llvm_unreachable("Missing specialization/instantiation case?");
Douglas Gregor454885e2009-10-15 15:54:05 +00005852}
5853
John McCallaf2094e2010-04-08 09:05:18 +00005854/// \brief Perform semantic analysis for the given dependent function
James Dennettef2b5b32012-06-15 22:23:43 +00005855/// template specialization.
John McCallaf2094e2010-04-08 09:05:18 +00005856///
James Dennettef2b5b32012-06-15 22:23:43 +00005857/// The only possible way to get a dependent function template specialization
5858/// is with a friend declaration, like so:
5859///
5860/// \code
5861/// template \<class T> void foo(T);
5862/// template \<class T> class A {
John McCallaf2094e2010-04-08 09:05:18 +00005863/// friend void foo<>(T);
5864/// };
James Dennettef2b5b32012-06-15 22:23:43 +00005865/// \endcode
John McCallaf2094e2010-04-08 09:05:18 +00005866///
5867/// There really isn't any useful analysis we can do here, so we
5868/// just store the information.
5869bool
5870Sema::CheckDependentFunctionTemplateSpecialization(FunctionDecl *FD,
5871 const TemplateArgumentListInfo &ExplicitTemplateArgs,
5872 LookupResult &Previous) {
5873 // Remove anything from Previous that isn't a function template in
5874 // the correct context.
Sebastian Redl7a126a42010-08-31 00:36:30 +00005875 DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext();
John McCallaf2094e2010-04-08 09:05:18 +00005876 LookupResult::Filter F = Previous.makeFilter();
5877 while (F.hasNext()) {
5878 NamedDecl *D = F.next()->getUnderlyingDecl();
5879 if (!isa<FunctionTemplateDecl>(D) ||
Sebastian Redl7a126a42010-08-31 00:36:30 +00005880 !FDLookupContext->InEnclosingNamespaceSetOf(
5881 D->getDeclContext()->getRedeclContext()))
John McCallaf2094e2010-04-08 09:05:18 +00005882 F.erase();
5883 }
5884 F.done();
5885
5886 // Should this be diagnosed here?
5887 if (Previous.empty()) return true;
5888
5889 FD->setDependentTemplateSpecialization(Context, Previous.asUnresolvedSet(),
5890 ExplicitTemplateArgs);
5891 return false;
5892}
5893
Abramo Bagnarae03db982010-05-20 15:32:11 +00005894/// \brief Perform semantic analysis for the given function template
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005895/// specialization.
5896///
Abramo Bagnarae03db982010-05-20 15:32:11 +00005897/// This routine performs all of the semantic analysis required for an
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005898/// explicit function template specialization. On successful completion,
5899/// the function declaration \p FD will become a function template
5900/// specialization.
5901///
5902/// \param FD the function declaration, which will be updated to become a
5903/// function template specialization.
5904///
Abramo Bagnarae03db982010-05-20 15:32:11 +00005905/// \param ExplicitTemplateArgs the explicitly-provided template arguments,
5906/// if any. Note that this may be valid info even when 0 arguments are
5907/// explicitly provided as in, e.g., \c void sort<>(char*, char*);
5908/// as it anyway contains info on the angle brackets locations.
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005909///
Francois Pichet59e7c562011-07-08 06:21:47 +00005910/// \param Previous the set of declarations that may be specialized by
Abramo Bagnarae03db982010-05-20 15:32:11 +00005911/// this function specialization.
Larisse Voufo43847122013-07-19 23:00:19 +00005912bool Sema::CheckFunctionTemplateSpecialization(
5913 FunctionDecl *FD, TemplateArgumentListInfo *ExplicitTemplateArgs,
5914 LookupResult &Previous) {
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005915 // The set of function template specializations that could match this
5916 // explicit function template specialization.
John McCallc373d482010-01-27 01:50:18 +00005917 UnresolvedSet<8> Candidates;
Larisse Voufo43847122013-07-19 23:00:19 +00005918 TemplateSpecCandidateSet FailedCandidates(FD->getLocation());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005919
Sebastian Redl7a126a42010-08-31 00:36:30 +00005920 DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext();
John McCall68263142009-11-18 22:49:29 +00005921 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
5922 I != E; ++I) {
5923 NamedDecl *Ovl = (*I)->getUnderlyingDecl();
5924 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Ovl)) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005925 // Only consider templates found within the same semantic lookup scope as
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005926 // FD.
Sebastian Redl7a126a42010-08-31 00:36:30 +00005927 if (!FDLookupContext->InEnclosingNamespaceSetOf(
5928 Ovl->getDeclContext()->getRedeclContext()))
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005929 continue;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005930
Richard Smith21c8fa82013-01-14 05:37:29 +00005931 // When matching a constexpr member function template specialization
5932 // against the primary template, we don't yet know whether the
5933 // specialization has an implicit 'const' (because we don't know whether
5934 // it will be a static member function until we know which template it
5935 // specializes), so adjust it now assuming it specializes this template.
5936 QualType FT = FD->getType();
5937 if (FD->isConstexpr()) {
5938 CXXMethodDecl *OldMD =
5939 dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl());
5940 if (OldMD && OldMD->isConst()) {
5941 const FunctionProtoType *FPT = FT->castAs<FunctionProtoType>();
5942 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
5943 EPI.TypeQuals |= Qualifiers::Const;
Reid Kleckner0567a792013-06-10 20:51:09 +00005944 FT = Context.getFunctionType(FPT->getResultType(), FPT->getArgTypes(),
Jordan Rosebea522f2013-03-08 21:51:21 +00005945 EPI);
Richard Smith21c8fa82013-01-14 05:37:29 +00005946 }
5947 }
5948
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005949 // C++ [temp.expl.spec]p11:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005950 // A trailing template-argument can be left unspecified in the
5951 // template-id naming an explicit function template specialization
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005952 // provided it can be deduced from the function argument type.
5953 // Perform template argument deduction to determine whether we may be
5954 // specializing this template.
5955 // FIXME: It is somewhat wasteful to build
Larisse Voufo43847122013-07-19 23:00:19 +00005956 TemplateDeductionInfo Info(FailedCandidates.getLocation());
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005957 FunctionDecl *Specialization = 0;
5958 if (TemplateDeductionResult TDK
Richard Smith21c8fa82013-01-14 05:37:29 +00005959 = DeduceTemplateArguments(FunTmpl, ExplicitTemplateArgs, FT,
5960 Specialization, Info)) {
Larisse Voufo43847122013-07-19 23:00:19 +00005961 // Template argument deduction failed; record why it failed, so
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005962 // that we can provide nifty diagnostics.
Larisse Voufo43847122013-07-19 23:00:19 +00005963 FailedCandidates.addCandidate()
5964 .set(FunTmpl->getTemplatedDecl(),
5965 MakeDeductionFailureInfo(Context, TDK, Info));
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005966 (void)TDK;
5967 continue;
5968 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005969
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005970 // Record this candidate.
John McCallc373d482010-01-27 01:50:18 +00005971 Candidates.addDecl(Specialization, I.getAccess());
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005972 }
5973 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005974
Douglas Gregorc5df30f2009-09-26 03:41:46 +00005975 // Find the most specialized function template.
Larisse Voufo43847122013-07-19 23:00:19 +00005976 UnresolvedSetIterator Result = getMostSpecialized(
5977 Candidates.begin(), Candidates.end(), FailedCandidates, TPOC_Other, 0,
5978 FD->getLocation(),
5979 PDiag(diag::err_function_template_spec_no_match) << FD->getDeclName(),
5980 PDiag(diag::err_function_template_spec_ambiguous)
5981 << FD->getDeclName() << (ExplicitTemplateArgs != 0),
5982 PDiag(diag::note_function_template_spec_matched));
5983
John McCallc373d482010-01-27 01:50:18 +00005984 if (Result == Candidates.end())
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005985 return true;
John McCallc373d482010-01-27 01:50:18 +00005986
5987 // Ignore access information; it doesn't figure into redeclaration checking.
5988 FunctionDecl *Specialization = cast<FunctionDecl>(*Result);
Abramo Bagnaraabfb4052011-03-04 17:20:30 +00005989
5990 FunctionTemplateSpecializationInfo *SpecInfo
5991 = Specialization->getTemplateSpecializationInfo();
5992 assert(SpecInfo && "Function template specialization info missing?");
Francois Pichet59e7c562011-07-08 06:21:47 +00005993
5994 // Note: do not overwrite location info if previous template
5995 // specialization kind was explicit.
5996 TemplateSpecializationKind TSK = SpecInfo->getTemplateSpecializationKind();
Richard Smithff234882012-02-20 23:28:05 +00005997 if (TSK == TSK_Undeclared || TSK == TSK_ImplicitInstantiation) {
Francois Pichet59e7c562011-07-08 06:21:47 +00005998 Specialization->setLocation(FD->getLocation());
Richard Smithff234882012-02-20 23:28:05 +00005999 // C++11 [dcl.constexpr]p1: An explicit specialization of a constexpr
6000 // function can differ from the template declaration with respect to
6001 // the constexpr specifier.
6002 Specialization->setConstexpr(FD->isConstexpr());
6003 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006004
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006005 // FIXME: Check if the prior specialization has a point of instantiation.
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006006 // If so, we have run afoul of .
John McCall7ad650f2010-03-24 07:46:06 +00006007
6008 // If this is a friend declaration, then we're not really declaring
6009 // an explicit specialization.
6010 bool isFriend = (FD->getFriendObjectKind() != Decl::FOK_None);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006011
Douglas Gregord5cb8762009-10-07 00:13:32 +00006012 // Check the scope of this explicit specialization.
John McCall7ad650f2010-03-24 07:46:06 +00006013 if (!isFriend &&
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006014 CheckTemplateSpecializationScope(*this,
Douglas Gregord5cb8762009-10-07 00:13:32 +00006015 Specialization->getPrimaryTemplate(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006016 Specialization, FD->getLocation(),
Douglas Gregor9302da62009-10-14 23:50:59 +00006017 false))
Douglas Gregord5cb8762009-10-07 00:13:32 +00006018 return true;
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006019
6020 // C++ [temp.expl.spec]p6:
6021 // If a template, a member template or the member of a class template is
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006022 // explicitly specialized then that specialization shall be declared
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006023 // before the first use of that specialization that would cause an implicit
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006024 // instantiation to take place, in every translation unit in which such a
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006025 // use occurs; no diagnostic is required.
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006026 bool HasNoEffect = false;
John McCall7ad650f2010-03-24 07:46:06 +00006027 if (!isFriend &&
6028 CheckSpecializationInstantiationRedecl(FD->getLocation(),
John McCall75042392010-02-11 01:33:53 +00006029 TSK_ExplicitSpecialization,
6030 Specialization,
6031 SpecInfo->getTemplateSpecializationKind(),
6032 SpecInfo->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006033 HasNoEffect))
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006034 return true;
Douglas Gregore885e182011-05-21 18:53:30 +00006035
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006036 // Mark the prior declaration as an explicit specialization, so that later
6037 // clients know that this is an explicit specialization.
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00006038 if (!isFriend) {
John McCall7ad650f2010-03-24 07:46:06 +00006039 SpecInfo->setTemplateSpecializationKind(TSK_ExplicitSpecialization);
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00006040 MarkUnusedFileScopedDecl(Specialization);
6041 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006042
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006043 // Turn the given function declaration into a function template
6044 // specialization, with the template arguments from the previous
6045 // specialization.
Abramo Bagnarae03db982010-05-20 15:32:11 +00006046 // Take copies of (semantic and syntactic) template argument lists.
6047 const TemplateArgumentList* TemplArgs = new (Context)
6048 TemplateArgumentList(Specialization->getTemplateSpecializationArgs());
Douglas Gregor838db382010-02-11 01:19:42 +00006049 FD->setFunctionTemplateSpecialization(Specialization->getPrimaryTemplate(),
Abramo Bagnarae03db982010-05-20 15:32:11 +00006050 TemplArgs, /*InsertPos=*/0,
6051 SpecInfo->getTemplateSpecializationKind(),
Argyrios Kyrtzidis71a76052011-09-22 20:07:09 +00006052 ExplicitTemplateArgs);
Rafael Espindolad2615cc2013-04-03 19:27:57 +00006053
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006054 // The "previous declaration" for this function template specialization is
6055 // the prior function template specialization.
John McCall68263142009-11-18 22:49:29 +00006056 Previous.clear();
6057 Previous.addDecl(Specialization);
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00006058 return false;
6059}
6060
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006061/// \brief Perform semantic analysis for the given non-template member
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006062/// specialization.
6063///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006064/// This routine performs all of the semantic analysis required for an
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006065/// explicit member function specialization. On successful completion,
6066/// the function declaration \p FD will become a member function
6067/// specialization.
6068///
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006069/// \param Member the member declaration, which will be updated to become a
6070/// specialization.
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006071///
John McCall68263142009-11-18 22:49:29 +00006072/// \param Previous the set of declarations, one of which may be specialized
6073/// by this function specialization; the set will be modified to contain the
6074/// redeclared member.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006075bool
John McCall68263142009-11-18 22:49:29 +00006076Sema::CheckMemberSpecialization(NamedDecl *Member, LookupResult &Previous) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006077 assert(!isa<TemplateDecl>(Member) && "Only for non-template members");
John McCall77e8b112010-04-13 20:37:33 +00006078
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006079 // Try to find the member we are instantiating.
6080 NamedDecl *Instantiation = 0;
6081 NamedDecl *InstantiatedFrom = 0;
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006082 MemberSpecializationInfo *MSInfo = 0;
6083
John McCall68263142009-11-18 22:49:29 +00006084 if (Previous.empty()) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006085 // Nowhere to look anyway.
6086 } else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Member)) {
John McCall68263142009-11-18 22:49:29 +00006087 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
6088 I != E; ++I) {
6089 NamedDecl *D = (*I)->getUnderlyingDecl();
6090 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006091 if (Context.hasSameType(Function->getType(), Method->getType())) {
6092 Instantiation = Method;
6093 InstantiatedFrom = Method->getInstantiatedFromMemberFunction();
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006094 MSInfo = Method->getMemberSpecializationInfo();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006095 break;
6096 }
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006097 }
6098 }
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006099 } else if (isa<VarDecl>(Member)) {
John McCall68263142009-11-18 22:49:29 +00006100 VarDecl *PrevVar;
6101 if (Previous.isSingleResult() &&
6102 (PrevVar = dyn_cast<VarDecl>(Previous.getFoundDecl())))
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006103 if (PrevVar->isStaticDataMember()) {
John McCall68263142009-11-18 22:49:29 +00006104 Instantiation = PrevVar;
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006105 InstantiatedFrom = PrevVar->getInstantiatedFromStaticDataMember();
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006106 MSInfo = PrevVar->getMemberSpecializationInfo();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006107 }
6108 } else if (isa<RecordDecl>(Member)) {
John McCall68263142009-11-18 22:49:29 +00006109 CXXRecordDecl *PrevRecord;
6110 if (Previous.isSingleResult() &&
6111 (PrevRecord = dyn_cast<CXXRecordDecl>(Previous.getFoundDecl()))) {
6112 Instantiation = PrevRecord;
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006113 InstantiatedFrom = PrevRecord->getInstantiatedFromMemberClass();
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006114 MSInfo = PrevRecord->getMemberSpecializationInfo();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006115 }
Richard Smith1af83c42012-03-23 03:33:32 +00006116 } else if (isa<EnumDecl>(Member)) {
6117 EnumDecl *PrevEnum;
6118 if (Previous.isSingleResult() &&
6119 (PrevEnum = dyn_cast<EnumDecl>(Previous.getFoundDecl()))) {
6120 Instantiation = PrevEnum;
6121 InstantiatedFrom = PrevEnum->getInstantiatedFromMemberEnum();
6122 MSInfo = PrevEnum->getMemberSpecializationInfo();
6123 }
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006124 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006125
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006126 if (!Instantiation) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006127 // There is no previous declaration that matches. Since member
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006128 // specializations are always out-of-line, the caller will complain about
6129 // this mismatch later.
6130 return false;
6131 }
John McCall77e8b112010-04-13 20:37:33 +00006132
6133 // If this is a friend, just bail out here before we start turning
6134 // things into explicit specializations.
6135 if (Member->getFriendObjectKind() != Decl::FOK_None) {
6136 // Preserve instantiation information.
6137 if (InstantiatedFrom && isa<CXXMethodDecl>(Member)) {
6138 cast<CXXMethodDecl>(Member)->setInstantiationOfMemberFunction(
6139 cast<CXXMethodDecl>(InstantiatedFrom),
6140 cast<CXXMethodDecl>(Instantiation)->getTemplateSpecializationKind());
6141 } else if (InstantiatedFrom && isa<CXXRecordDecl>(Member)) {
6142 cast<CXXRecordDecl>(Member)->setInstantiationOfMemberClass(
6143 cast<CXXRecordDecl>(InstantiatedFrom),
6144 cast<CXXRecordDecl>(Instantiation)->getTemplateSpecializationKind());
6145 }
6146
6147 Previous.clear();
6148 Previous.addDecl(Instantiation);
6149 return false;
6150 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006151
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006152 // Make sure that this is a specialization of a member.
6153 if (!InstantiatedFrom) {
6154 Diag(Member->getLocation(), diag::err_spec_member_not_instantiated)
6155 << Member;
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006156 Diag(Instantiation->getLocation(), diag::note_specialized_decl);
6157 return true;
6158 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006159
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006160 // C++ [temp.expl.spec]p6:
6161 // If a template, a member template or the member of a class template is
Nico Weberff91d242011-12-23 20:58:04 +00006162 // explicitly specialized then that specialization shall be declared
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006163 // before the first use of that specialization that would cause an implicit
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006164 // instantiation to take place, in every translation unit in which such a
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006165 // use occurs; no diagnostic is required.
6166 assert(MSInfo && "Member specialization info missing?");
John McCall75042392010-02-11 01:33:53 +00006167
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006168 bool HasNoEffect = false;
John McCall75042392010-02-11 01:33:53 +00006169 if (CheckSpecializationInstantiationRedecl(Member->getLocation(),
6170 TSK_ExplicitSpecialization,
6171 Instantiation,
6172 MSInfo->getTemplateSpecializationKind(),
6173 MSInfo->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006174 HasNoEffect))
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006175 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006176
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006177 // Check the scope of this explicit specialization.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006178 if (CheckTemplateSpecializationScope(*this,
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006179 InstantiatedFrom,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006180 Instantiation, Member->getLocation(),
Douglas Gregor9302da62009-10-14 23:50:59 +00006181 false))
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006182 return true;
Douglas Gregor2db32322009-10-07 23:56:10 +00006183
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006184 // Note that this is an explicit instantiation of a member.
Douglas Gregorf6b11852009-10-08 15:14:33 +00006185 // the original declaration to note that it is an explicit specialization
6186 // (if it was previously an implicit instantiation). This latter step
6187 // makes bookkeeping easier.
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006188 if (isa<FunctionDecl>(Member)) {
Douglas Gregorf6b11852009-10-08 15:14:33 +00006189 FunctionDecl *InstantiationFunction = cast<FunctionDecl>(Instantiation);
6190 if (InstantiationFunction->getTemplateSpecializationKind() ==
6191 TSK_ImplicitInstantiation) {
6192 InstantiationFunction->setTemplateSpecializationKind(
6193 TSK_ExplicitSpecialization);
6194 InstantiationFunction->setLocation(Member->getLocation());
6195 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006196
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006197 cast<FunctionDecl>(Member)->setInstantiationOfMemberFunction(
6198 cast<CXXMethodDecl>(InstantiatedFrom),
6199 TSK_ExplicitSpecialization);
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00006200 MarkUnusedFileScopedDecl(InstantiationFunction);
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006201 } else if (isa<VarDecl>(Member)) {
Douglas Gregorf6b11852009-10-08 15:14:33 +00006202 VarDecl *InstantiationVar = cast<VarDecl>(Instantiation);
6203 if (InstantiationVar->getTemplateSpecializationKind() ==
6204 TSK_ImplicitInstantiation) {
6205 InstantiationVar->setTemplateSpecializationKind(
6206 TSK_ExplicitSpecialization);
6207 InstantiationVar->setLocation(Member->getLocation());
6208 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006209
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006210 Context.setInstantiatedFromStaticDataMember(cast<VarDecl>(Member),
6211 cast<VarDecl>(InstantiatedFrom),
6212 TSK_ExplicitSpecialization);
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00006213 MarkUnusedFileScopedDecl(InstantiationVar);
Richard Smith1af83c42012-03-23 03:33:32 +00006214 } else if (isa<CXXRecordDecl>(Member)) {
Douglas Gregorf6b11852009-10-08 15:14:33 +00006215 CXXRecordDecl *InstantiationClass = cast<CXXRecordDecl>(Instantiation);
6216 if (InstantiationClass->getTemplateSpecializationKind() ==
6217 TSK_ImplicitInstantiation) {
6218 InstantiationClass->setTemplateSpecializationKind(
6219 TSK_ExplicitSpecialization);
6220 InstantiationClass->setLocation(Member->getLocation());
6221 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006222
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006223 cast<CXXRecordDecl>(Member)->setInstantiationOfMemberClass(
Douglas Gregorf6b11852009-10-08 15:14:33 +00006224 cast<CXXRecordDecl>(InstantiatedFrom),
6225 TSK_ExplicitSpecialization);
Richard Smith1af83c42012-03-23 03:33:32 +00006226 } else {
6227 assert(isa<EnumDecl>(Member) && "Only member enums remain");
6228 EnumDecl *InstantiationEnum = cast<EnumDecl>(Instantiation);
6229 if (InstantiationEnum->getTemplateSpecializationKind() ==
6230 TSK_ImplicitInstantiation) {
6231 InstantiationEnum->setTemplateSpecializationKind(
6232 TSK_ExplicitSpecialization);
6233 InstantiationEnum->setLocation(Member->getLocation());
6234 }
6235
6236 cast<EnumDecl>(Member)->setInstantiationOfMemberEnum(
6237 cast<EnumDecl>(InstantiatedFrom), TSK_ExplicitSpecialization);
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006238 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006239
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006240 // Save the caller the trouble of having to figure out which declaration
6241 // this specialization matches.
John McCall68263142009-11-18 22:49:29 +00006242 Previous.clear();
6243 Previous.addDecl(Instantiation);
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006244 return false;
6245}
6246
Douglas Gregor558c0322009-10-14 23:41:34 +00006247/// \brief Check the scope of an explicit instantiation.
Douglas Gregor669eed82010-07-13 00:10:04 +00006248///
6249/// \returns true if a serious error occurs, false otherwise.
6250static bool CheckExplicitInstantiationScope(Sema &S, NamedDecl *D,
Douglas Gregor558c0322009-10-14 23:41:34 +00006251 SourceLocation InstLoc,
6252 bool WasQualifiedName) {
Sebastian Redl7a126a42010-08-31 00:36:30 +00006253 DeclContext *OrigContext= D->getDeclContext()->getEnclosingNamespaceContext();
6254 DeclContext *CurContext = S.CurContext->getRedeclContext();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006255
Douglas Gregor669eed82010-07-13 00:10:04 +00006256 if (CurContext->isRecord()) {
6257 S.Diag(InstLoc, diag::err_explicit_instantiation_in_class)
6258 << D;
6259 return true;
6260 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006261
Richard Smith3e2e91e2011-10-18 02:28:33 +00006262 // C++11 [temp.explicit]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006263 // An explicit instantiation shall appear in an enclosing namespace of its
Richard Smith3e2e91e2011-10-18 02:28:33 +00006264 // template. If the name declared in the explicit instantiation is an
6265 // unqualified name, the explicit instantiation shall appear in the
6266 // namespace where its template is declared or, if that namespace is inline
6267 // (7.3.1), any namespace from its enclosing namespace set.
Douglas Gregor558c0322009-10-14 23:41:34 +00006268 //
6269 // This is DR275, which we do not retroactively apply to C++98/03.
Richard Smith3e2e91e2011-10-18 02:28:33 +00006270 if (WasQualifiedName) {
6271 if (CurContext->Encloses(OrigContext))
6272 return false;
6273 } else {
6274 if (CurContext->InEnclosingNamespaceSetOf(OrigContext))
6275 return false;
6276 }
6277
6278 if (NamespaceDecl *NS = dyn_cast<NamespaceDecl>(OrigContext)) {
6279 if (WasQualifiedName)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006280 S.Diag(InstLoc,
Richard Smith80ad52f2013-01-02 11:42:31 +00006281 S.getLangOpts().CPlusPlus11?
Richard Smith3e2e91e2011-10-18 02:28:33 +00006282 diag::err_explicit_instantiation_out_of_scope :
6283 diag::warn_explicit_instantiation_out_of_scope_0x)
Douglas Gregor558c0322009-10-14 23:41:34 +00006284 << D << NS;
6285 else
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006286 S.Diag(InstLoc,
Richard Smith80ad52f2013-01-02 11:42:31 +00006287 S.getLangOpts().CPlusPlus11?
Richard Smith3e2e91e2011-10-18 02:28:33 +00006288 diag::err_explicit_instantiation_unqualified_wrong_namespace :
6289 diag::warn_explicit_instantiation_unqualified_wrong_namespace_0x)
6290 << D << NS;
6291 } else
6292 S.Diag(InstLoc,
Richard Smith80ad52f2013-01-02 11:42:31 +00006293 S.getLangOpts().CPlusPlus11?
Richard Smith3e2e91e2011-10-18 02:28:33 +00006294 diag::err_explicit_instantiation_must_be_global :
6295 diag::warn_explicit_instantiation_must_be_global_0x)
6296 << D;
Douglas Gregor558c0322009-10-14 23:41:34 +00006297 S.Diag(D->getLocation(), diag::note_explicit_instantiation_here);
Douglas Gregor669eed82010-07-13 00:10:04 +00006298 return false;
Douglas Gregor558c0322009-10-14 23:41:34 +00006299}
6300
6301/// \brief Determine whether the given scope specifier has a template-id in it.
6302static bool ScopeSpecifierHasTemplateId(const CXXScopeSpec &SS) {
6303 if (!SS.isSet())
6304 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006305
Richard Smith3e2e91e2011-10-18 02:28:33 +00006306 // C++11 [temp.explicit]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006307 // If the explicit instantiation is for a member function, a member class
Douglas Gregor558c0322009-10-14 23:41:34 +00006308 // or a static data member of a class template specialization, the name of
6309 // the class template specialization in the qualified-id for the member
6310 // name shall be a simple-template-id.
6311 //
6312 // C++98 has the same restriction, just worded differently.
6313 for (NestedNameSpecifier *NNS = (NestedNameSpecifier *)SS.getScopeRep();
6314 NNS; NNS = NNS->getPrefix())
John McCallf4c73712011-01-19 06:33:43 +00006315 if (const Type *T = NNS->getAsType())
Douglas Gregor558c0322009-10-14 23:41:34 +00006316 if (isa<TemplateSpecializationType>(T))
6317 return true;
6318
6319 return false;
6320}
6321
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006322// Explicit instantiation of a class template specialization
John McCallf312b1e2010-08-26 23:41:50 +00006323DeclResult
Mike Stump1eb44332009-09-09 15:08:12 +00006324Sema::ActOnExplicitInstantiation(Scope *S,
Douglas Gregor45f96552009-09-04 06:33:52 +00006325 SourceLocation ExternLoc,
6326 SourceLocation TemplateLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00006327 unsigned TagSpec,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006328 SourceLocation KWLoc,
6329 const CXXScopeSpec &SS,
6330 TemplateTy TemplateD,
6331 SourceLocation TemplateNameLoc,
6332 SourceLocation LAngleLoc,
6333 ASTTemplateArgsPtr TemplateArgsIn,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006334 SourceLocation RAngleLoc,
6335 AttributeList *Attr) {
6336 // Find the class template we're specializing
6337 TemplateName Name = TemplateD.getAsVal<TemplateName>();
Richard Smithb1ce9292013-06-22 22:03:31 +00006338 TemplateDecl *TD = Name.getAsTemplateDecl();
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006339 // Check that the specialization uses the same tag kind as the
6340 // original template.
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006341 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
6342 assert(Kind != TTK_Enum &&
6343 "Invalid enum tag in class template explicit instantiation!");
Richard Smithb1ce9292013-06-22 22:03:31 +00006344
6345 if (isa<TypeAliasTemplateDecl>(TD)) {
6346 Diag(KWLoc, diag::err_tag_reference_non_tag) << Kind;
6347 Diag(TD->getTemplatedDecl()->getLocation(),
6348 diag::note_previous_use);
6349 return true;
6350 }
6351
6352 ClassTemplateDecl *ClassTemplate = cast<ClassTemplateDecl>(TD);
6353
Douglas Gregor501c5ce2009-05-14 16:41:31 +00006354 if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(),
Richard Trieubbf34c02011-06-10 03:11:26 +00006355 Kind, /*isDefinition*/false, KWLoc,
Douglas Gregor501c5ce2009-05-14 16:41:31 +00006356 *ClassTemplate->getIdentifier())) {
Mike Stump1eb44332009-09-09 15:08:12 +00006357 Diag(KWLoc, diag::err_use_with_wrong_tag)
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006358 << ClassTemplate
Douglas Gregor849b2432010-03-31 17:46:05 +00006359 << FixItHint::CreateReplacement(KWLoc,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006360 ClassTemplate->getTemplatedDecl()->getKindName());
Mike Stump1eb44332009-09-09 15:08:12 +00006361 Diag(ClassTemplate->getTemplatedDecl()->getLocation(),
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006362 diag::note_previous_use);
6363 Kind = ClassTemplate->getTemplatedDecl()->getTagKind();
6364 }
6365
Douglas Gregor558c0322009-10-14 23:41:34 +00006366 // C++0x [temp.explicit]p2:
6367 // There are two forms of explicit instantiation: an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006368 // definition and an explicit instantiation declaration. An explicit
6369 // instantiation declaration begins with the extern keyword. [...]
Douglas Gregord5cb8762009-10-07 00:13:32 +00006370 TemplateSpecializationKind TSK
6371 = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition
6372 : TSK_ExplicitInstantiationDeclaration;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006373
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006374 // Translate the parser's template argument list in our AST format.
John McCalld5532b62009-11-23 01:53:49 +00006375 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
Douglas Gregor314b97f2009-11-10 19:49:08 +00006376 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006377
6378 // Check that the template argument list is well-formed for this
6379 // template.
Chris Lattner5f9e2722011-07-23 10:55:15 +00006380 SmallVector<TemplateArgument, 4> Converted;
John McCalld5532b62009-11-23 01:53:49 +00006381 if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc,
6382 TemplateArgs, false, Converted))
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006383 return true;
6384
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006385 // Find the class template specialization declaration that
6386 // corresponds to these arguments.
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006387 void *InsertPos = 0;
6388 ClassTemplateSpecializationDecl *PrevDecl
Douglas Gregor910f8002010-11-07 23:05:16 +00006389 = ClassTemplate->findSpecialization(Converted.data(),
6390 Converted.size(), InsertPos);
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006391
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006392 TemplateSpecializationKind PrevDecl_TSK
6393 = PrevDecl ? PrevDecl->getTemplateSpecializationKind() : TSK_Undeclared;
6394
Douglas Gregord5cb8762009-10-07 00:13:32 +00006395 // C++0x [temp.explicit]p2:
6396 // [...] An explicit instantiation shall appear in an enclosing
6397 // namespace of its template. [...]
6398 //
6399 // This is C++ DR 275.
Douglas Gregor669eed82010-07-13 00:10:04 +00006400 if (CheckExplicitInstantiationScope(*this, ClassTemplate, TemplateNameLoc,
6401 SS.isSet()))
6402 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006403
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006404 ClassTemplateSpecializationDecl *Specialization = 0;
6405
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006406 bool HasNoEffect = false;
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006407 if (PrevDecl) {
Douglas Gregor0d035142009-10-27 18:42:08 +00006408 if (CheckSpecializationInstantiationRedecl(TemplateNameLoc, TSK,
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006409 PrevDecl, PrevDecl_TSK,
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006410 PrevDecl->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006411 HasNoEffect))
John McCalld226f652010-08-21 09:40:31 +00006412 return PrevDecl;
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006413
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006414 // Even though HasNoEffect == true means that this explicit instantiation
6415 // has no effect on semantics, we go on to put its syntax in the AST.
6416
6417 if (PrevDecl_TSK == TSK_ImplicitInstantiation ||
6418 PrevDecl_TSK == TSK_Undeclared) {
Douglas Gregor52604ab2009-09-11 21:19:12 +00006419 // Since the only prior class template specialization with these
6420 // arguments was referenced but not declared, reuse that
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006421 // declaration node as our own, updating the source location
6422 // for the template name to reflect our new declaration.
6423 // (Other source locations will be updated later.)
Douglas Gregor52604ab2009-09-11 21:19:12 +00006424 Specialization = PrevDecl;
6425 Specialization->setLocation(TemplateNameLoc);
6426 PrevDecl = 0;
6427 }
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006428 }
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006429
Douglas Gregor52604ab2009-09-11 21:19:12 +00006430 if (!Specialization) {
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006431 // Create a new class template specialization declaration node for
6432 // this explicit specialization.
6433 Specialization
Douglas Gregor13c85772010-05-06 00:28:52 +00006434 = ClassTemplateSpecializationDecl::Create(Context, Kind,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006435 ClassTemplate->getDeclContext(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00006436 KWLoc, TemplateNameLoc,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006437 ClassTemplate,
Douglas Gregor910f8002010-11-07 23:05:16 +00006438 Converted.data(),
6439 Converted.size(),
6440 PrevDecl);
John McCallb6217662010-03-15 10:12:16 +00006441 SetNestedNameSpecifier(Specialization, SS);
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006442
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00006443 if (!HasNoEffect && !PrevDecl) {
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006444 // Insert the new specialization.
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00006445 ClassTemplate->AddSpecialization(Specialization, InsertPos);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006446 }
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006447 }
6448
6449 // Build the fully-sugared type for this explicit instantiation as
6450 // the user wrote in the explicit instantiation itself. This means
6451 // that we'll pretty-print the type retrieved from the
6452 // specialization's declaration the way that the user actually wrote
6453 // the explicit instantiation, rather than formatting the name based
6454 // on the "canonical" representation used to store the template
6455 // arguments in the specialization.
John McCall3cb0ebd2010-03-10 03:28:59 +00006456 TypeSourceInfo *WrittenTy
6457 = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc,
6458 TemplateArgs,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006459 Context.getTypeDeclType(Specialization));
6460 Specialization->setTypeAsWritten(WrittenTy);
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006461
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006462 // Set source locations for keywords.
6463 Specialization->setExternLoc(ExternLoc);
6464 Specialization->setTemplateKeywordLoc(TemplateLoc);
Argyrios Kyrtzidis2fb5d122013-04-22 23:23:42 +00006465 Specialization->setRBraceLoc(SourceLocation());
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006466
Rafael Espindola0257b7f2012-01-03 06:04:21 +00006467 if (Attr)
6468 ProcessDeclAttributeList(S, Specialization, Attr);
6469
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006470 // Add the explicit instantiation into its lexical context. However,
6471 // since explicit instantiations are never found by name lookup, we
6472 // just put it into the declaration context directly.
6473 Specialization->setLexicalDeclContext(CurContext);
6474 CurContext->addDecl(Specialization);
6475
6476 // Syntax is now OK, so return if it has no other effect on semantics.
6477 if (HasNoEffect) {
6478 // Set the template specialization kind.
6479 Specialization->setTemplateSpecializationKind(TSK);
John McCalld226f652010-08-21 09:40:31 +00006480 return Specialization;
Douglas Gregord78f5982009-11-25 06:01:46 +00006481 }
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006482
6483 // C++ [temp.explicit]p3:
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006484 // A definition of a class template or class member template
6485 // shall be in scope at the point of the explicit instantiation of
6486 // the class template or class member template.
6487 //
6488 // This check comes when we actually try to perform the
6489 // instantiation.
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006490 ClassTemplateSpecializationDecl *Def
6491 = cast_or_null<ClassTemplateSpecializationDecl>(
Douglas Gregor952b0172010-02-11 01:04:33 +00006492 Specialization->getDefinition());
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006493 if (!Def)
Douglas Gregor972e6ce2009-10-27 06:26:26 +00006494 InstantiateClassTemplateSpecialization(TemplateNameLoc, Specialization, TSK);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006495 else if (TSK == TSK_ExplicitInstantiationDefinition) {
Douglas Gregor6fb745b2010-05-13 16:44:06 +00006496 MarkVTableUsed(TemplateNameLoc, Specialization, true);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006497 Specialization->setPointOfInstantiation(Def->getPointOfInstantiation());
6498 }
Douglas Gregor6fb745b2010-05-13 16:44:06 +00006499
Douglas Gregor0d035142009-10-27 18:42:08 +00006500 // Instantiate the members of this class template specialization.
6501 Def = cast_or_null<ClassTemplateSpecializationDecl>(
Douglas Gregor952b0172010-02-11 01:04:33 +00006502 Specialization->getDefinition());
Rafael Espindolab0f65ca2010-03-22 23:12:48 +00006503 if (Def) {
Rafael Espindolaf075b222010-03-23 19:55:22 +00006504 TemplateSpecializationKind Old_TSK = Def->getTemplateSpecializationKind();
6505
6506 // Fix a TSK_ExplicitInstantiationDeclaration followed by a
6507 // TSK_ExplicitInstantiationDefinition
6508 if (Old_TSK == TSK_ExplicitInstantiationDeclaration &&
6509 TSK == TSK_ExplicitInstantiationDefinition)
6510 Def->setTemplateSpecializationKind(TSK);
Rafael Espindolab0f65ca2010-03-22 23:12:48 +00006511
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006512 InstantiateClassTemplateSpecializationMembers(TemplateNameLoc, Def, TSK);
Rafael Espindolab0f65ca2010-03-22 23:12:48 +00006513 }
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006514
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006515 // Set the template specialization kind.
6516 Specialization->setTemplateSpecializationKind(TSK);
John McCalld226f652010-08-21 09:40:31 +00006517 return Specialization;
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006518}
6519
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006520// Explicit instantiation of a member class of a class template.
John McCalld226f652010-08-21 09:40:31 +00006521DeclResult
Mike Stump1eb44332009-09-09 15:08:12 +00006522Sema::ActOnExplicitInstantiation(Scope *S,
Douglas Gregor45f96552009-09-04 06:33:52 +00006523 SourceLocation ExternLoc,
6524 SourceLocation TemplateLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00006525 unsigned TagSpec,
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006526 SourceLocation KWLoc,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00006527 CXXScopeSpec &SS,
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006528 IdentifierInfo *Name,
6529 SourceLocation NameLoc,
6530 AttributeList *Attr) {
6531
Douglas Gregor402abb52009-05-28 23:31:59 +00006532 bool Owned = false;
John McCallc4e70192009-09-11 04:59:25 +00006533 bool IsDependent = false;
John McCallf312b1e2010-08-26 23:41:50 +00006534 Decl *TagD = ActOnTag(S, TagSpec, Sema::TUK_Reference,
John McCalld226f652010-08-21 09:40:31 +00006535 KWLoc, SS, Name, NameLoc, Attr, AS_none,
Douglas Gregore7612302011-09-09 19:05:14 +00006536 /*ModulePrivateLoc=*/SourceLocation(),
Benjamin Kramer5354e772012-08-23 23:38:35 +00006537 MultiTemplateParamsArg(), Owned, IsDependent,
6538 SourceLocation(), false, TypeResult());
John McCallc4e70192009-09-11 04:59:25 +00006539 assert(!IsDependent && "explicit instantiation of dependent name not yet handled");
6540
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006541 if (!TagD)
6542 return true;
6543
John McCalld226f652010-08-21 09:40:31 +00006544 TagDecl *Tag = cast<TagDecl>(TagD);
Richard Smith1af83c42012-03-23 03:33:32 +00006545 assert(!Tag->isEnum() && "shouldn't see enumerations here");
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006546
Douglas Gregord0c87372009-05-27 17:30:49 +00006547 if (Tag->isInvalidDecl())
6548 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006549
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006550 CXXRecordDecl *Record = cast<CXXRecordDecl>(Tag);
6551 CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass();
6552 if (!Pattern) {
6553 Diag(TemplateLoc, diag::err_explicit_instantiation_nontemplate_type)
6554 << Context.getTypeDeclType(Record);
6555 Diag(Record->getLocation(), diag::note_nontemplate_decl_here);
6556 return true;
6557 }
6558
Douglas Gregor558c0322009-10-14 23:41:34 +00006559 // C++0x [temp.explicit]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006560 // If the explicit instantiation is for a class or member class, the
6561 // elaborated-type-specifier in the declaration shall include a
Douglas Gregor558c0322009-10-14 23:41:34 +00006562 // simple-template-id.
6563 //
6564 // C++98 has the same restriction, just worded differently.
6565 if (!ScopeSpecifierHasTemplateId(SS))
Douglas Gregora2dd8282010-06-16 16:26:47 +00006566 Diag(TemplateLoc, diag::ext_explicit_instantiation_without_qualified_id)
Douglas Gregor558c0322009-10-14 23:41:34 +00006567 << Record << SS.getRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006568
Douglas Gregor558c0322009-10-14 23:41:34 +00006569 // C++0x [temp.explicit]p2:
6570 // There are two forms of explicit instantiation: an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006571 // definition and an explicit instantiation declaration. An explicit
Douglas Gregor558c0322009-10-14 23:41:34 +00006572 // instantiation declaration begins with the extern keyword. [...]
Douglas Gregora74bbe22009-10-14 21:46:58 +00006573 TemplateSpecializationKind TSK
6574 = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition
6575 : TSK_ExplicitInstantiationDeclaration;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006576
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006577 // C++0x [temp.explicit]p2:
6578 // [...] An explicit instantiation shall appear in an enclosing
6579 // namespace of its template. [...]
6580 //
6581 // This is C++ DR 275.
Douglas Gregor558c0322009-10-14 23:41:34 +00006582 CheckExplicitInstantiationScope(*this, Record, NameLoc, true);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006583
Douglas Gregor454885e2009-10-15 15:54:05 +00006584 // Verify that it is okay to explicitly instantiate here.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006585 CXXRecordDecl *PrevDecl
Douglas Gregoref96ee02012-01-14 16:38:05 +00006586 = cast_or_null<CXXRecordDecl>(Record->getPreviousDecl());
Douglas Gregor952b0172010-02-11 01:04:33 +00006587 if (!PrevDecl && Record->getDefinition())
Douglas Gregor583f33b2009-10-15 18:07:02 +00006588 PrevDecl = Record;
6589 if (PrevDecl) {
Douglas Gregor454885e2009-10-15 15:54:05 +00006590 MemberSpecializationInfo *MSInfo = PrevDecl->getMemberSpecializationInfo();
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006591 bool HasNoEffect = false;
Douglas Gregor454885e2009-10-15 15:54:05 +00006592 assert(MSInfo && "No member specialization information?");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006593 if (CheckSpecializationInstantiationRedecl(TemplateLoc, TSK,
Douglas Gregor454885e2009-10-15 15:54:05 +00006594 PrevDecl,
6595 MSInfo->getTemplateSpecializationKind(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006596 MSInfo->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006597 HasNoEffect))
Douglas Gregor454885e2009-10-15 15:54:05 +00006598 return true;
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006599 if (HasNoEffect)
Douglas Gregor454885e2009-10-15 15:54:05 +00006600 return TagD;
6601 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006602
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006603 CXXRecordDecl *RecordDef
Douglas Gregor952b0172010-02-11 01:04:33 +00006604 = cast_or_null<CXXRecordDecl>(Record->getDefinition());
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006605 if (!RecordDef) {
Douglas Gregorbf7643e2009-10-15 12:53:22 +00006606 // C++ [temp.explicit]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006607 // A definition of a member class of a class template shall be in scope
Douglas Gregorbf7643e2009-10-15 12:53:22 +00006608 // at the point of an explicit instantiation of the member class.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006609 CXXRecordDecl *Def
Douglas Gregor952b0172010-02-11 01:04:33 +00006610 = cast_or_null<CXXRecordDecl>(Pattern->getDefinition());
Douglas Gregorbf7643e2009-10-15 12:53:22 +00006611 if (!Def) {
Douglas Gregore2d3a3d2009-10-15 14:05:49 +00006612 Diag(TemplateLoc, diag::err_explicit_instantiation_undefined_member)
6613 << 0 << Record->getDeclName() << Record->getDeclContext();
Douglas Gregorbf7643e2009-10-15 12:53:22 +00006614 Diag(Pattern->getLocation(), diag::note_forward_declaration)
6615 << Pattern;
6616 return true;
Douglas Gregor0d035142009-10-27 18:42:08 +00006617 } else {
6618 if (InstantiateClass(NameLoc, Record, Def,
6619 getTemplateInstantiationArgs(Record),
6620 TSK))
6621 return true;
6622
Douglas Gregor952b0172010-02-11 01:04:33 +00006623 RecordDef = cast_or_null<CXXRecordDecl>(Record->getDefinition());
Douglas Gregor0d035142009-10-27 18:42:08 +00006624 if (!RecordDef)
6625 return true;
6626 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006627 }
6628
Douglas Gregor0d035142009-10-27 18:42:08 +00006629 // Instantiate all of the members of the class.
6630 InstantiateClassMembers(NameLoc, RecordDef,
6631 getTemplateInstantiationArgs(Record), TSK);
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006632
Douglas Gregor6fb745b2010-05-13 16:44:06 +00006633 if (TSK == TSK_ExplicitInstantiationDefinition)
6634 MarkVTableUsed(NameLoc, RecordDef, true);
6635
Mike Stump390b4cc2009-05-16 07:39:55 +00006636 // FIXME: We don't have any representation for explicit instantiations of
6637 // member classes. Such a representation is not needed for compilation, but it
6638 // should be available for clients that want to see all of the declarations in
6639 // the source code.
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006640 return TagD;
6641}
6642
John McCallf312b1e2010-08-26 23:41:50 +00006643DeclResult Sema::ActOnExplicitInstantiation(Scope *S,
6644 SourceLocation ExternLoc,
6645 SourceLocation TemplateLoc,
6646 Declarator &D) {
Douglas Gregord5a423b2009-09-25 18:43:00 +00006647 // Explicit instantiations always require a name.
Abramo Bagnara25777432010-08-11 22:01:17 +00006648 // TODO: check if/when DNInfo should replace Name.
6649 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
6650 DeclarationName Name = NameInfo.getName();
Douglas Gregord5a423b2009-09-25 18:43:00 +00006651 if (!Name) {
6652 if (!D.isInvalidType())
Daniel Dunbar96a00142012-03-09 18:35:03 +00006653 Diag(D.getDeclSpec().getLocStart(),
Douglas Gregord5a423b2009-09-25 18:43:00 +00006654 diag::err_explicit_instantiation_requires_name)
6655 << D.getDeclSpec().getSourceRange()
6656 << D.getSourceRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006657
Douglas Gregord5a423b2009-09-25 18:43:00 +00006658 return true;
6659 }
6660
6661 // The scope passed in may not be a decl scope. Zip up the scope tree until
6662 // we find one that is.
6663 while ((S->getFlags() & Scope::DeclScope) == 0 ||
6664 (S->getFlags() & Scope::TemplateParamScope) != 0)
6665 S = S->getParent();
6666
6667 // Determine the type of the declaration.
John McCallbf1a0282010-06-04 23:28:52 +00006668 TypeSourceInfo *T = GetTypeForDeclarator(D, S);
6669 QualType R = T->getType();
Douglas Gregord5a423b2009-09-25 18:43:00 +00006670 if (R.isNull())
6671 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006672
Douglas Gregore885e182011-05-21 18:53:30 +00006673 // C++ [dcl.stc]p1:
6674 // A storage-class-specifier shall not be specified in [...] an explicit
6675 // instantiation (14.7.2) directive.
Douglas Gregord5a423b2009-09-25 18:43:00 +00006676 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
Douglas Gregord5a423b2009-09-25 18:43:00 +00006677 Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_of_typedef)
6678 << Name;
6679 return true;
Douglas Gregore885e182011-05-21 18:53:30 +00006680 } else if (D.getDeclSpec().getStorageClassSpec()
6681 != DeclSpec::SCS_unspecified) {
6682 // Complain about then remove the storage class specifier.
6683 Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_storage_class)
6684 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
6685
6686 D.getMutableDeclSpec().ClearStorageClassSpecs();
Douglas Gregord5a423b2009-09-25 18:43:00 +00006687 }
6688
Douglas Gregor663b5a02009-10-14 20:14:33 +00006689 // C++0x [temp.explicit]p1:
6690 // [...] An explicit instantiation of a function template shall not use the
6691 // inline or constexpr specifiers.
6692 // Presumably, this also applies to member functions of class templates as
6693 // well.
Richard Smith2dc7ece2011-10-18 03:44:03 +00006694 if (D.getDeclSpec().isInlineSpecified())
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006695 Diag(D.getDeclSpec().getInlineSpecLoc(),
Richard Smith80ad52f2013-01-02 11:42:31 +00006696 getLangOpts().CPlusPlus11 ?
Richard Smith2dc7ece2011-10-18 03:44:03 +00006697 diag::err_explicit_instantiation_inline :
6698 diag::warn_explicit_instantiation_inline_0x)
Richard Smithfe6f6482011-10-14 19:58:02 +00006699 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
6700 if (D.getDeclSpec().isConstexprSpecified())
6701 // FIXME: Add a fix-it to remove the 'constexpr' and add a 'const' if one is
6702 // not already specified.
6703 Diag(D.getDeclSpec().getConstexprSpecLoc(),
6704 diag::err_explicit_instantiation_constexpr);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006705
Douglas Gregor558c0322009-10-14 23:41:34 +00006706 // C++0x [temp.explicit]p2:
6707 // There are two forms of explicit instantiation: an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006708 // definition and an explicit instantiation declaration. An explicit
6709 // instantiation declaration begins with the extern keyword. [...]
Douglas Gregord5a423b2009-09-25 18:43:00 +00006710 TemplateSpecializationKind TSK
6711 = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition
6712 : TSK_ExplicitInstantiationDeclaration;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006713
Abramo Bagnara25777432010-08-11 22:01:17 +00006714 LookupResult Previous(*this, NameInfo, LookupOrdinaryName);
John McCalla24dc2e2009-11-17 02:14:36 +00006715 LookupParsedName(Previous, S, &D.getCXXScopeSpec());
Douglas Gregord5a423b2009-09-25 18:43:00 +00006716
6717 if (!R->isFunctionType()) {
6718 // C++ [temp.explicit]p1:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006719 // A [...] static data member of a class template can be explicitly
6720 // instantiated from the member definition associated with its class
Douglas Gregord5a423b2009-09-25 18:43:00 +00006721 // template.
John McCalla24dc2e2009-11-17 02:14:36 +00006722 if (Previous.isAmbiguous())
6723 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006724
John McCall1bcee0a2009-12-02 08:25:40 +00006725 VarDecl *Prev = Previous.getAsSingle<VarDecl>();
Douglas Gregord5a423b2009-09-25 18:43:00 +00006726 if (!Prev || !Prev->isStaticDataMember()) {
6727 // We expect to see a data data member here.
6728 Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_not_known)
6729 << Name;
6730 for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end();
6731 P != PEnd; ++P)
John McCallf36e02d2009-10-09 21:13:30 +00006732 Diag((*P)->getLocation(), diag::note_explicit_instantiation_here);
Douglas Gregord5a423b2009-09-25 18:43:00 +00006733 return true;
6734 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006735
Douglas Gregord5a423b2009-09-25 18:43:00 +00006736 if (!Prev->getInstantiatedFromStaticDataMember()) {
6737 // FIXME: Check for explicit specialization?
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006738 Diag(D.getIdentifierLoc(),
Douglas Gregord5a423b2009-09-25 18:43:00 +00006739 diag::err_explicit_instantiation_data_member_not_instantiated)
6740 << Prev;
6741 Diag(Prev->getLocation(), diag::note_explicit_instantiation_here);
6742 // FIXME: Can we provide a note showing where this was declared?
6743 return true;
6744 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006745
Douglas Gregor558c0322009-10-14 23:41:34 +00006746 // C++0x [temp.explicit]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006747 // If the explicit instantiation is for a member function, a member class
Douglas Gregor558c0322009-10-14 23:41:34 +00006748 // or a static data member of a class template specialization, the name of
6749 // the class template specialization in the qualified-id for the member
6750 // name shall be a simple-template-id.
6751 //
6752 // C++98 has the same restriction, just worded differently.
6753 if (!ScopeSpecifierHasTemplateId(D.getCXXScopeSpec()))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006754 Diag(D.getIdentifierLoc(),
Douglas Gregora2dd8282010-06-16 16:26:47 +00006755 diag::ext_explicit_instantiation_without_qualified_id)
Douglas Gregor558c0322009-10-14 23:41:34 +00006756 << Prev << D.getCXXScopeSpec().getRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006757
Douglas Gregor558c0322009-10-14 23:41:34 +00006758 // Check the scope of this explicit instantiation.
6759 CheckExplicitInstantiationScope(*this, Prev, D.getIdentifierLoc(), true);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006760
Douglas Gregor454885e2009-10-15 15:54:05 +00006761 // Verify that it is okay to explicitly instantiate here.
6762 MemberSpecializationInfo *MSInfo = Prev->getMemberSpecializationInfo();
6763 assert(MSInfo && "Missing static data member specialization info?");
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006764 bool HasNoEffect = false;
Douglas Gregor0d035142009-10-27 18:42:08 +00006765 if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK, Prev,
Douglas Gregor454885e2009-10-15 15:54:05 +00006766 MSInfo->getTemplateSpecializationKind(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006767 MSInfo->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006768 HasNoEffect))
Douglas Gregor454885e2009-10-15 15:54:05 +00006769 return true;
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006770 if (HasNoEffect)
John McCalld226f652010-08-21 09:40:31 +00006771 return (Decl*) 0;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006772
Douglas Gregord5a423b2009-09-25 18:43:00 +00006773 // Instantiate static data member.
Douglas Gregor0a897e32009-10-15 17:21:20 +00006774 Prev->setTemplateSpecializationKind(TSK, D.getIdentifierLoc());
Douglas Gregord5a423b2009-09-25 18:43:00 +00006775 if (TSK == TSK_ExplicitInstantiationDefinition)
Chandler Carruth58e390e2010-08-25 08:27:02 +00006776 InstantiateStaticDataMemberDefinition(D.getIdentifierLoc(), Prev);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006777
Douglas Gregord5a423b2009-09-25 18:43:00 +00006778 // FIXME: Create an ExplicitInstantiation node?
John McCalld226f652010-08-21 09:40:31 +00006779 return (Decl*) 0;
Douglas Gregord5a423b2009-09-25 18:43:00 +00006780 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006781
6782 // If the declarator is a template-id, translate the parser's template
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00006783 // argument list into our AST format.
Douglas Gregordb422df2009-09-25 21:45:23 +00006784 bool HasExplicitTemplateArgs = false;
John McCalld5532b62009-11-23 01:53:49 +00006785 TemplateArgumentListInfo TemplateArgs;
Douglas Gregor3f9a0562009-11-03 01:35:08 +00006786 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
6787 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
John McCalld5532b62009-11-23 01:53:49 +00006788 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
6789 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
Benjamin Kramer5354e772012-08-23 23:38:35 +00006790 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
Douglas Gregordb422df2009-09-25 21:45:23 +00006791 TemplateId->NumArgs);
John McCalld5532b62009-11-23 01:53:49 +00006792 translateTemplateArguments(TemplateArgsPtr, TemplateArgs);
Douglas Gregordb422df2009-09-25 21:45:23 +00006793 HasExplicitTemplateArgs = true;
6794 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006795
Douglas Gregord5a423b2009-09-25 18:43:00 +00006796 // C++ [temp.explicit]p1:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006797 // A [...] function [...] can be explicitly instantiated from its template.
6798 // A member function [...] of a class template can be explicitly
6799 // instantiated from the member definition associated with its class
Douglas Gregord5a423b2009-09-25 18:43:00 +00006800 // template.
John McCallc373d482010-01-27 01:50:18 +00006801 UnresolvedSet<8> Matches;
Larisse Voufo43847122013-07-19 23:00:19 +00006802 TemplateSpecCandidateSet FailedCandidates(D.getIdentifierLoc());
Douglas Gregord5a423b2009-09-25 18:43:00 +00006803 for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end();
6804 P != PEnd; ++P) {
6805 NamedDecl *Prev = *P;
Douglas Gregordb422df2009-09-25 21:45:23 +00006806 if (!HasExplicitTemplateArgs) {
6807 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Prev)) {
6808 if (Context.hasSameUnqualifiedType(Method->getType(), R)) {
6809 Matches.clear();
Douglas Gregor48026d22010-01-11 18:40:55 +00006810
John McCallc373d482010-01-27 01:50:18 +00006811 Matches.addDecl(Method, P.getAccess());
Douglas Gregor48026d22010-01-11 18:40:55 +00006812 if (Method->getTemplateSpecializationKind() == TSK_Undeclared)
6813 break;
Douglas Gregordb422df2009-09-25 21:45:23 +00006814 }
Douglas Gregord5a423b2009-09-25 18:43:00 +00006815 }
6816 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006817
Douglas Gregord5a423b2009-09-25 18:43:00 +00006818 FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Prev);
6819 if (!FunTmpl)
6820 continue;
6821
Larisse Voufo43847122013-07-19 23:00:19 +00006822 TemplateDeductionInfo Info(FailedCandidates.getLocation());
Douglas Gregord5a423b2009-09-25 18:43:00 +00006823 FunctionDecl *Specialization = 0;
6824 if (TemplateDeductionResult TDK
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006825 = DeduceTemplateArguments(FunTmpl,
John McCalld5532b62009-11-23 01:53:49 +00006826 (HasExplicitTemplateArgs ? &TemplateArgs : 0),
Douglas Gregord5a423b2009-09-25 18:43:00 +00006827 R, Specialization, Info)) {
Larisse Voufo43847122013-07-19 23:00:19 +00006828 // Keep track of almost-matches.
6829 FailedCandidates.addCandidate()
6830 .set(FunTmpl->getTemplatedDecl(),
6831 MakeDeductionFailureInfo(Context, TDK, Info));
Douglas Gregord5a423b2009-09-25 18:43:00 +00006832 (void)TDK;
6833 continue;
6834 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006835
John McCallc373d482010-01-27 01:50:18 +00006836 Matches.addDecl(Specialization, P.getAccess());
Douglas Gregord5a423b2009-09-25 18:43:00 +00006837 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006838
Douglas Gregord5a423b2009-09-25 18:43:00 +00006839 // Find the most specialized function template specialization.
Larisse Voufo43847122013-07-19 23:00:19 +00006840 UnresolvedSetIterator Result = getMostSpecialized(
6841 Matches.begin(), Matches.end(), FailedCandidates, TPOC_Other, 0,
6842 D.getIdentifierLoc(),
6843 PDiag(diag::err_explicit_instantiation_not_known) << Name,
6844 PDiag(diag::err_explicit_instantiation_ambiguous) << Name,
6845 PDiag(diag::note_explicit_instantiation_candidate));
Douglas Gregord5a423b2009-09-25 18:43:00 +00006846
John McCallc373d482010-01-27 01:50:18 +00006847 if (Result == Matches.end())
Douglas Gregord5a423b2009-09-25 18:43:00 +00006848 return true;
John McCallc373d482010-01-27 01:50:18 +00006849
6850 // Ignore access control bits, we don't need them for redeclaration checking.
6851 FunctionDecl *Specialization = cast<FunctionDecl>(*Result);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006852
Douglas Gregor0a897e32009-10-15 17:21:20 +00006853 if (Specialization->getTemplateSpecializationKind() == TSK_Undeclared) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006854 Diag(D.getIdentifierLoc(),
Douglas Gregord5a423b2009-09-25 18:43:00 +00006855 diag::err_explicit_instantiation_member_function_not_instantiated)
6856 << Specialization
6857 << (Specialization->getTemplateSpecializationKind() ==
6858 TSK_ExplicitSpecialization);
6859 Diag(Specialization->getLocation(), diag::note_explicit_instantiation_here);
6860 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006861 }
6862
Douglas Gregoref96ee02012-01-14 16:38:05 +00006863 FunctionDecl *PrevDecl = Specialization->getPreviousDecl();
Douglas Gregor583f33b2009-10-15 18:07:02 +00006864 if (!PrevDecl && Specialization->isThisDeclarationADefinition())
6865 PrevDecl = Specialization;
6866
Douglas Gregor0a897e32009-10-15 17:21:20 +00006867 if (PrevDecl) {
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006868 bool HasNoEffect = false;
Douglas Gregor0d035142009-10-27 18:42:08 +00006869 if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006870 PrevDecl,
6871 PrevDecl->getTemplateSpecializationKind(),
Douglas Gregor0a897e32009-10-15 17:21:20 +00006872 PrevDecl->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006873 HasNoEffect))
Douglas Gregor0a897e32009-10-15 17:21:20 +00006874 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006875
Douglas Gregor0a897e32009-10-15 17:21:20 +00006876 // FIXME: We may still want to build some representation of this
6877 // explicit specialization.
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006878 if (HasNoEffect)
John McCalld226f652010-08-21 09:40:31 +00006879 return (Decl*) 0;
Douglas Gregor0a897e32009-10-15 17:21:20 +00006880 }
Anders Carlsson26d6e9d2009-11-24 05:34:41 +00006881
6882 Specialization->setTemplateSpecializationKind(TSK, D.getIdentifierLoc());
Rafael Espindola256fc4d2012-01-04 05:40:59 +00006883 AttributeList *Attr = D.getDeclSpec().getAttributes().getList();
6884 if (Attr)
6885 ProcessDeclAttributeList(S, Specialization, Attr);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006886
Douglas Gregor0a897e32009-10-15 17:21:20 +00006887 if (TSK == TSK_ExplicitInstantiationDefinition)
Chandler Carruth58e390e2010-08-25 08:27:02 +00006888 InstantiateFunctionDefinition(D.getIdentifierLoc(), Specialization);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006889
Douglas Gregor558c0322009-10-14 23:41:34 +00006890 // C++0x [temp.explicit]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006891 // If the explicit instantiation is for a member function, a member class
Douglas Gregor558c0322009-10-14 23:41:34 +00006892 // or a static data member of a class template specialization, the name of
6893 // the class template specialization in the qualified-id for the member
6894 // name shall be a simple-template-id.
6895 //
6896 // C++98 has the same restriction, just worded differently.
Douglas Gregor0a897e32009-10-15 17:21:20 +00006897 FunctionTemplateDecl *FunTmpl = Specialization->getPrimaryTemplate();
Douglas Gregor3f9a0562009-11-03 01:35:08 +00006898 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId && !FunTmpl &&
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006899 D.getCXXScopeSpec().isSet() &&
Douglas Gregor558c0322009-10-14 23:41:34 +00006900 !ScopeSpecifierHasTemplateId(D.getCXXScopeSpec()))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006901 Diag(D.getIdentifierLoc(),
Douglas Gregora2dd8282010-06-16 16:26:47 +00006902 diag::ext_explicit_instantiation_without_qualified_id)
Douglas Gregor558c0322009-10-14 23:41:34 +00006903 << Specialization << D.getCXXScopeSpec().getRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006904
Douglas Gregor558c0322009-10-14 23:41:34 +00006905 CheckExplicitInstantiationScope(*this,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006906 FunTmpl? (NamedDecl *)FunTmpl
Douglas Gregor558c0322009-10-14 23:41:34 +00006907 : Specialization->getInstantiatedFromMemberFunction(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006908 D.getIdentifierLoc(),
Douglas Gregor558c0322009-10-14 23:41:34 +00006909 D.getCXXScopeSpec().isSet());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006910
Douglas Gregord5a423b2009-09-25 18:43:00 +00006911 // FIXME: Create some kind of ExplicitInstantiationDecl here.
John McCalld226f652010-08-21 09:40:31 +00006912 return (Decl*) 0;
Douglas Gregord5a423b2009-09-25 18:43:00 +00006913}
6914
John McCallf312b1e2010-08-26 23:41:50 +00006915TypeResult
John McCallc4e70192009-09-11 04:59:25 +00006916Sema::ActOnDependentTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
6917 const CXXScopeSpec &SS, IdentifierInfo *Name,
6918 SourceLocation TagLoc, SourceLocation NameLoc) {
6919 // This has to hold, because SS is expected to be defined.
6920 assert(Name && "Expected a name in a dependent tag");
6921
6922 NestedNameSpecifier *NNS
6923 = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
6924 if (!NNS)
6925 return true;
6926
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006927 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
Daniel Dunbar12c0ade2010-04-01 16:50:48 +00006928
Douglas Gregor48c89f42010-04-24 16:38:41 +00006929 if (TUK == TUK_Declaration || TUK == TUK_Definition) {
6930 Diag(NameLoc, diag::err_dependent_tag_decl)
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006931 << (TUK == TUK_Definition) << Kind << SS.getRange();
Douglas Gregor48c89f42010-04-24 16:38:41 +00006932 return true;
6933 }
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006934
Douglas Gregor059101f2011-03-02 00:47:37 +00006935 // Create the resulting type.
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006936 ElaboratedTypeKeyword Kwd = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
Douglas Gregor059101f2011-03-02 00:47:37 +00006937 QualType Result = Context.getDependentNameType(Kwd, NNS, Name);
6938
6939 // Create type-source location information for this type.
6940 TypeLocBuilder TLB;
6941 DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(Result);
Abramo Bagnara38a42912012-02-06 19:09:27 +00006942 TL.setElaboratedKeywordLoc(TagLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00006943 TL.setQualifierLoc(SS.getWithLocInContext(Context));
6944 TL.setNameLoc(NameLoc);
6945 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
John McCallc4e70192009-09-11 04:59:25 +00006946}
6947
John McCallf312b1e2010-08-26 23:41:50 +00006948TypeResult
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006949Sema::ActOnTypenameType(Scope *S, SourceLocation TypenameLoc,
6950 const CXXScopeSpec &SS, const IdentifierInfo &II,
Douglas Gregor1a15dae2010-06-16 22:31:08 +00006951 SourceLocation IdLoc) {
Douglas Gregore29425b2011-02-28 22:42:13 +00006952 if (SS.isInvalid())
Douglas Gregord57959a2009-03-27 23:10:48 +00006953 return true;
Douglas Gregore29425b2011-02-28 22:42:13 +00006954
Richard Smithebaf0e62011-10-18 20:49:44 +00006955 if (TypenameLoc.isValid() && S && !S->getTemplateParamParent())
6956 Diag(TypenameLoc,
Richard Smith80ad52f2013-01-02 11:42:31 +00006957 getLangOpts().CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00006958 diag::warn_cxx98_compat_typename_outside_of_template :
6959 diag::ext_typename_outside_of_template)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006960 << FixItHint::CreateRemoval(TypenameLoc);
6961
Douglas Gregor2494dd02011-03-01 01:34:45 +00006962 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
Douglas Gregor9e876872011-03-01 18:12:44 +00006963 QualType T = CheckTypenameType(TypenameLoc.isValid()? ETK_Typename : ETK_None,
6964 TypenameLoc, QualifierLoc, II, IdLoc);
Douglas Gregor31a19b62009-04-01 21:51:26 +00006965 if (T.isNull())
6966 return true;
John McCall63b43852010-04-29 23:50:39 +00006967
6968 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
6969 if (isa<DependentNameType>(T)) {
David Blaikie39e6ab42013-02-18 22:06:02 +00006970 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>();
Abramo Bagnara38a42912012-02-06 19:09:27 +00006971 TL.setElaboratedKeywordLoc(TypenameLoc);
Douglas Gregor2494dd02011-03-01 01:34:45 +00006972 TL.setQualifierLoc(QualifierLoc);
John McCall4e449832010-05-28 23:32:21 +00006973 TL.setNameLoc(IdLoc);
John McCall63b43852010-04-29 23:50:39 +00006974 } else {
David Blaikie39e6ab42013-02-18 22:06:02 +00006975 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>();
Abramo Bagnara38a42912012-02-06 19:09:27 +00006976 TL.setElaboratedKeywordLoc(TypenameLoc);
Douglas Gregor9e876872011-03-01 18:12:44 +00006977 TL.setQualifierLoc(QualifierLoc);
David Blaikie39e6ab42013-02-18 22:06:02 +00006978 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(IdLoc);
John McCall63b43852010-04-29 23:50:39 +00006979 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006980
John McCallb3d87482010-08-24 05:47:05 +00006981 return CreateParsedType(T, TSI);
Douglas Gregord57959a2009-03-27 23:10:48 +00006982}
6983
John McCallf312b1e2010-08-26 23:41:50 +00006984TypeResult
Abramo Bagnara55d23c92012-02-06 14:41:24 +00006985Sema::ActOnTypenameType(Scope *S,
6986 SourceLocation TypenameLoc,
6987 const CXXScopeSpec &SS,
6988 SourceLocation TemplateKWLoc,
Douglas Gregora02411e2011-02-27 22:46:49 +00006989 TemplateTy TemplateIn,
6990 SourceLocation TemplateNameLoc,
6991 SourceLocation LAngleLoc,
6992 ASTTemplateArgsPtr TemplateArgsIn,
6993 SourceLocation RAngleLoc) {
Richard Smithebaf0e62011-10-18 20:49:44 +00006994 if (TypenameLoc.isValid() && S && !S->getTemplateParamParent())
6995 Diag(TypenameLoc,
Richard Smith80ad52f2013-01-02 11:42:31 +00006996 getLangOpts().CPlusPlus11 ?
Richard Smithebaf0e62011-10-18 20:49:44 +00006997 diag::warn_cxx98_compat_typename_outside_of_template :
6998 diag::ext_typename_outside_of_template)
6999 << FixItHint::CreateRemoval(TypenameLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00007000
7001 // Translate the parser's template argument list in our AST format.
7002 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
7003 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
7004
7005 TemplateName Template = TemplateIn.get();
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007006 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
7007 // Construct a dependent template specialization type.
7008 assert(DTN && "dependent template has non-dependent name?");
7009 assert(DTN->getQualifier()
7010 == static_cast<NestedNameSpecifier*>(SS.getScopeRep()));
7011 QualType T = Context.getDependentTemplateSpecializationType(ETK_Typename,
7012 DTN->getQualifier(),
7013 DTN->getIdentifier(),
7014 TemplateArgs);
Douglas Gregora02411e2011-02-27 22:46:49 +00007015
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007016 // Create source-location information for this type.
John McCall4e449832010-05-28 23:32:21 +00007017 TypeLocBuilder Builder;
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007018 DependentTemplateSpecializationTypeLoc SpecTL
7019 = Builder.push<DependentTemplateSpecializationTypeLoc>(T);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00007020 SpecTL.setElaboratedKeywordLoc(TypenameLoc);
7021 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
Abramo Bagnara66581d42012-02-06 22:45:07 +00007022 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00007023 SpecTL.setTemplateNameLoc(TemplateNameLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00007024 SpecTL.setLAngleLoc(LAngleLoc);
7025 SpecTL.setRAngleLoc(RAngleLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00007026 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
7027 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007028 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
Douglas Gregor6946baf2009-09-02 13:05:45 +00007029 }
Douglas Gregora02411e2011-02-27 22:46:49 +00007030
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007031 QualType T = CheckTemplateIdType(Template, TemplateNameLoc, TemplateArgs);
7032 if (T.isNull())
7033 return true;
Douglas Gregora02411e2011-02-27 22:46:49 +00007034
Abramo Bagnara55d23c92012-02-06 14:41:24 +00007035 // Provide source-location information for the template specialization type.
Douglas Gregora02411e2011-02-27 22:46:49 +00007036 TypeLocBuilder Builder;
Abramo Bagnara55d23c92012-02-06 14:41:24 +00007037 TemplateSpecializationTypeLoc SpecTL
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007038 = Builder.push<TemplateSpecializationTypeLoc>(T);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00007039 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
7040 SpecTL.setTemplateNameLoc(TemplateNameLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00007041 SpecTL.setLAngleLoc(LAngleLoc);
7042 SpecTL.setRAngleLoc(RAngleLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00007043 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
7044 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
7045
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007046 T = Context.getElaboratedType(ETK_Typename, SS.getScopeRep(), T);
7047 ElaboratedTypeLoc TL = Builder.push<ElaboratedTypeLoc>(T);
Abramo Bagnara38a42912012-02-06 19:09:27 +00007048 TL.setElaboratedKeywordLoc(TypenameLoc);
Douglas Gregor9e876872011-03-01 18:12:44 +00007049 TL.setQualifierLoc(SS.getWithLocInContext(Context));
7050
Douglas Gregoref24c4b2011-03-01 16:44:30 +00007051 TypeSourceInfo *TSI = Builder.getTypeSourceInfo(Context, T);
7052 return CreateParsedType(T, TSI);
Douglas Gregor17343172009-04-01 00:28:59 +00007053}
7054
Douglas Gregora02411e2011-02-27 22:46:49 +00007055
Richard Smith4493c0a2012-05-09 05:17:00 +00007056/// Determine whether this failed name lookup should be treated as being
7057/// disabled by a usage of std::enable_if.
7058static bool isEnableIf(NestedNameSpecifierLoc NNS, const IdentifierInfo &II,
7059 SourceRange &CondRange) {
7060 // We must be looking for a ::type...
7061 if (!II.isStr("type"))
7062 return false;
7063
7064 // ... within an explicitly-written template specialization...
7065 if (!NNS || !NNS.getNestedNameSpecifier()->getAsType())
7066 return false;
7067 TypeLoc EnableIfTy = NNS.getTypeLoc();
David Blaikie39e6ab42013-02-18 22:06:02 +00007068 TemplateSpecializationTypeLoc EnableIfTSTLoc =
7069 EnableIfTy.getAs<TemplateSpecializationTypeLoc>();
7070 if (!EnableIfTSTLoc || EnableIfTSTLoc.getNumArgs() == 0)
Richard Smith4493c0a2012-05-09 05:17:00 +00007071 return false;
7072 const TemplateSpecializationType *EnableIfTST =
David Blaikie39e6ab42013-02-18 22:06:02 +00007073 cast<TemplateSpecializationType>(EnableIfTSTLoc.getTypePtr());
Richard Smith4493c0a2012-05-09 05:17:00 +00007074
7075 // ... which names a complete class template declaration...
7076 const TemplateDecl *EnableIfDecl =
7077 EnableIfTST->getTemplateName().getAsTemplateDecl();
7078 if (!EnableIfDecl || EnableIfTST->isIncompleteType())
7079 return false;
7080
7081 // ... called "enable_if".
7082 const IdentifierInfo *EnableIfII =
7083 EnableIfDecl->getDeclName().getAsIdentifierInfo();
7084 if (!EnableIfII || !EnableIfII->isStr("enable_if"))
7085 return false;
7086
7087 // Assume the first template argument is the condition.
David Blaikie39e6ab42013-02-18 22:06:02 +00007088 CondRange = EnableIfTSTLoc.getArgLoc(0).getSourceRange();
Richard Smith4493c0a2012-05-09 05:17:00 +00007089 return true;
7090}
7091
Douglas Gregord57959a2009-03-27 23:10:48 +00007092/// \brief Build the type that describes a C++ typename specifier,
7093/// e.g., "typename T::type".
7094QualType
Douglas Gregore29425b2011-02-28 22:42:13 +00007095Sema::CheckTypenameType(ElaboratedTypeKeyword Keyword,
7096 SourceLocation KeywordLoc,
7097 NestedNameSpecifierLoc QualifierLoc,
7098 const IdentifierInfo &II,
Abramo Bagnarae4da7a02010-05-19 21:37:53 +00007099 SourceLocation IILoc) {
John McCall77bb1aa2010-05-01 00:40:08 +00007100 CXXScopeSpec SS;
Douglas Gregore29425b2011-02-28 22:42:13 +00007101 SS.Adopt(QualifierLoc);
Douglas Gregord57959a2009-03-27 23:10:48 +00007102
John McCall77bb1aa2010-05-01 00:40:08 +00007103 DeclContext *Ctx = computeDeclContext(SS);
7104 if (!Ctx) {
7105 // If the nested-name-specifier is dependent and couldn't be
7106 // resolved to a type, build a typename type.
Douglas Gregore29425b2011-02-28 22:42:13 +00007107 assert(QualifierLoc.getNestedNameSpecifier()->isDependent());
7108 return Context.getDependentNameType(Keyword,
7109 QualifierLoc.getNestedNameSpecifier(),
7110 &II);
Douglas Gregor42af25f2009-05-11 19:58:34 +00007111 }
Douglas Gregord57959a2009-03-27 23:10:48 +00007112
John McCall77bb1aa2010-05-01 00:40:08 +00007113 // If the nested-name-specifier refers to the current instantiation,
7114 // the "typename" keyword itself is superfluous. In C++03, the
7115 // program is actually ill-formed. However, DR 382 (in C++0x CD1)
7116 // allows such extraneous "typename" keywords, and we retroactively
Douglas Gregor732281d2010-06-14 22:07:54 +00007117 // apply this DR to C++03 code with only a warning. In any case we continue.
Douglas Gregor42af25f2009-05-11 19:58:34 +00007118
John McCall77bb1aa2010-05-01 00:40:08 +00007119 if (RequireCompleteDeclContext(SS, Ctx))
7120 return QualType();
Douglas Gregord57959a2009-03-27 23:10:48 +00007121
7122 DeclarationName Name(&II);
Abramo Bagnarae4da7a02010-05-19 21:37:53 +00007123 LookupResult Result(*this, Name, IILoc, LookupOrdinaryName);
John McCalla24dc2e2009-11-17 02:14:36 +00007124 LookupQualifiedName(Result, Ctx);
Douglas Gregord57959a2009-03-27 23:10:48 +00007125 unsigned DiagID = 0;
7126 Decl *Referenced = 0;
John McCalla24dc2e2009-11-17 02:14:36 +00007127 switch (Result.getResultKind()) {
Richard Smith4493c0a2012-05-09 05:17:00 +00007128 case LookupResult::NotFound: {
7129 // If we're looking up 'type' within a template named 'enable_if', produce
7130 // a more specific diagnostic.
7131 SourceRange CondRange;
7132 if (isEnableIf(QualifierLoc, II, CondRange)) {
7133 Diag(CondRange.getBegin(), diag::err_typename_nested_not_found_enable_if)
7134 << Ctx << CondRange;
7135 return QualType();
7136 }
7137
Douglas Gregor3f093272009-10-13 21:16:44 +00007138 DiagID = diag::err_typename_nested_not_found;
Douglas Gregord57959a2009-03-27 23:10:48 +00007139 break;
Richard Smith4493c0a2012-05-09 05:17:00 +00007140 }
Douglas Gregord9545042010-12-09 00:06:27 +00007141
7142 case LookupResult::FoundUnresolvedValue: {
7143 // We found a using declaration that is a value. Most likely, the using
7144 // declaration itself is meant to have the 'typename' keyword.
Douglas Gregore29425b2011-02-28 22:42:13 +00007145 SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(),
Douglas Gregord9545042010-12-09 00:06:27 +00007146 IILoc);
7147 Diag(IILoc, diag::err_typename_refers_to_using_value_decl)
7148 << Name << Ctx << FullRange;
7149 if (UnresolvedUsingValueDecl *Using
7150 = dyn_cast<UnresolvedUsingValueDecl>(Result.getRepresentativeDecl())){
Douglas Gregordc355712011-02-25 00:36:19 +00007151 SourceLocation Loc = Using->getQualifierLoc().getBeginLoc();
Douglas Gregord9545042010-12-09 00:06:27 +00007152 Diag(Loc, diag::note_using_value_decl_missing_typename)
7153 << FixItHint::CreateInsertion(Loc, "typename ");
7154 }
7155 }
7156 // Fall through to create a dependent typename type, from which we can recover
7157 // better.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007158
Douglas Gregor7d3f5762010-01-15 01:44:47 +00007159 case LookupResult::NotFoundInCurrentInstantiation:
7160 // Okay, it's a member of an unknown instantiation.
Douglas Gregore29425b2011-02-28 22:42:13 +00007161 return Context.getDependentNameType(Keyword,
7162 QualifierLoc.getNestedNameSpecifier(),
7163 &II);
Douglas Gregord57959a2009-03-27 23:10:48 +00007164
7165 case LookupResult::Found:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007166 if (TypeDecl *Type = dyn_cast<TypeDecl>(Result.getFoundDecl())) {
Abramo Bagnara465d41b2010-05-11 21:36:43 +00007167 // We found a type. Build an ElaboratedType, since the
7168 // typename-specifier was just sugar.
Douglas Gregore29425b2011-02-28 22:42:13 +00007169 return Context.getElaboratedType(ETK_Typename,
7170 QualifierLoc.getNestedNameSpecifier(),
Abramo Bagnara465d41b2010-05-11 21:36:43 +00007171 Context.getTypeDeclType(Type));
Douglas Gregord57959a2009-03-27 23:10:48 +00007172 }
7173
7174 DiagID = diag::err_typename_nested_not_type;
John McCallf36e02d2009-10-09 21:13:30 +00007175 Referenced = Result.getFoundDecl();
Douglas Gregord57959a2009-03-27 23:10:48 +00007176 break;
7177
7178 case LookupResult::FoundOverloaded:
7179 DiagID = diag::err_typename_nested_not_type;
7180 Referenced = *Result.begin();
7181 break;
7182
John McCall6e247262009-10-10 05:48:19 +00007183 case LookupResult::Ambiguous:
Douglas Gregord57959a2009-03-27 23:10:48 +00007184 return QualType();
7185 }
7186
7187 // If we get here, it's because name lookup did not find a
7188 // type. Emit an appropriate diagnostic and return an error.
Douglas Gregore29425b2011-02-28 22:42:13 +00007189 SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(),
Abramo Bagnarae4da7a02010-05-19 21:37:53 +00007190 IILoc);
7191 Diag(IILoc, DiagID) << FullRange << Name << Ctx;
Douglas Gregord57959a2009-03-27 23:10:48 +00007192 if (Referenced)
7193 Diag(Referenced->getLocation(), diag::note_typename_refers_here)
7194 << Name;
7195 return QualType();
7196}
Douglas Gregor4a959d82009-08-06 16:20:37 +00007197
7198namespace {
7199 // See Sema::RebuildTypeInCurrentInstantiation
Benjamin Kramer85b45212009-11-28 19:45:26 +00007200 class CurrentInstantiationRebuilder
Mike Stump1eb44332009-09-09 15:08:12 +00007201 : public TreeTransform<CurrentInstantiationRebuilder> {
Douglas Gregor4a959d82009-08-06 16:20:37 +00007202 SourceLocation Loc;
7203 DeclarationName Entity;
Mike Stump1eb44332009-09-09 15:08:12 +00007204
Douglas Gregor4a959d82009-08-06 16:20:37 +00007205 public:
Douglas Gregor895162d2010-04-30 18:55:50 +00007206 typedef TreeTransform<CurrentInstantiationRebuilder> inherited;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007207
Mike Stump1eb44332009-09-09 15:08:12 +00007208 CurrentInstantiationRebuilder(Sema &SemaRef,
Douglas Gregor4a959d82009-08-06 16:20:37 +00007209 SourceLocation Loc,
Mike Stump1eb44332009-09-09 15:08:12 +00007210 DeclarationName Entity)
7211 : TreeTransform<CurrentInstantiationRebuilder>(SemaRef),
Douglas Gregor4a959d82009-08-06 16:20:37 +00007212 Loc(Loc), Entity(Entity) { }
Mike Stump1eb44332009-09-09 15:08:12 +00007213
7214 /// \brief Determine whether the given type \p T has already been
Douglas Gregor4a959d82009-08-06 16:20:37 +00007215 /// transformed.
7216 ///
7217 /// For the purposes of type reconstruction, a type has already been
7218 /// transformed if it is NULL or if it is not dependent.
7219 bool AlreadyTransformed(QualType T) {
7220 return T.isNull() || !T->isDependentType();
7221 }
Mike Stump1eb44332009-09-09 15:08:12 +00007222
7223 /// \brief Returns the location of the entity whose type is being
Douglas Gregor4a959d82009-08-06 16:20:37 +00007224 /// rebuilt.
7225 SourceLocation getBaseLocation() { return Loc; }
Mike Stump1eb44332009-09-09 15:08:12 +00007226
Douglas Gregor4a959d82009-08-06 16:20:37 +00007227 /// \brief Returns the name of the entity whose type is being rebuilt.
7228 DeclarationName getBaseEntity() { return Entity; }
Mike Stump1eb44332009-09-09 15:08:12 +00007229
Douglas Gregor972e6ce2009-10-27 06:26:26 +00007230 /// \brief Sets the "base" location and entity when that
7231 /// information is known based on another transformation.
7232 void setBase(SourceLocation Loc, DeclarationName Entity) {
7233 this->Loc = Loc;
7234 this->Entity = Entity;
7235 }
Douglas Gregordfca6f52012-02-13 22:00:16 +00007236
7237 ExprResult TransformLambdaExpr(LambdaExpr *E) {
7238 // Lambdas never need to be transformed.
7239 return E;
7240 }
Douglas Gregor4a959d82009-08-06 16:20:37 +00007241 };
7242}
7243
Douglas Gregor4a959d82009-08-06 16:20:37 +00007244/// \brief Rebuilds a type within the context of the current instantiation.
7245///
Mike Stump1eb44332009-09-09 15:08:12 +00007246/// The type \p T is part of the type of an out-of-line member definition of
Douglas Gregor4a959d82009-08-06 16:20:37 +00007247/// a class template (or class template partial specialization) that was parsed
Mike Stump1eb44332009-09-09 15:08:12 +00007248/// and constructed before we entered the scope of the class template (or
Douglas Gregor4a959d82009-08-06 16:20:37 +00007249/// partial specialization thereof). This routine will rebuild that type now
7250/// that we have entered the declarator's scope, which may produce different
7251/// canonical types, e.g.,
7252///
7253/// \code
7254/// template<typename T>
7255/// struct X {
7256/// typedef T* pointer;
7257/// pointer data();
7258/// };
7259///
7260/// template<typename T>
7261/// typename X<T>::pointer X<T>::data() { ... }
7262/// \endcode
7263///
Douglas Gregor4714c122010-03-31 17:34:00 +00007264/// Here, the type "typename X<T>::pointer" will be created as a DependentNameType,
Douglas Gregor4a959d82009-08-06 16:20:37 +00007265/// since we do not know that we can look into X<T> when we parsed the type.
7266/// This function will rebuild the type, performing the lookup of "pointer"
Abramo Bagnara465d41b2010-05-11 21:36:43 +00007267/// in X<T> and returning an ElaboratedType whose canonical type is the same
Douglas Gregor4a959d82009-08-06 16:20:37 +00007268/// as the canonical type of T*, allowing the return types of the out-of-line
7269/// definition and the declaration to match.
John McCall63b43852010-04-29 23:50:39 +00007270TypeSourceInfo *Sema::RebuildTypeInCurrentInstantiation(TypeSourceInfo *T,
7271 SourceLocation Loc,
7272 DeclarationName Name) {
7273 if (!T || !T->getType()->isDependentType())
Douglas Gregor4a959d82009-08-06 16:20:37 +00007274 return T;
Mike Stump1eb44332009-09-09 15:08:12 +00007275
Douglas Gregor4a959d82009-08-06 16:20:37 +00007276 CurrentInstantiationRebuilder Rebuilder(*this, Loc, Name);
7277 return Rebuilder.TransformType(T);
Benjamin Kramer27ba2f02009-08-11 22:33:06 +00007278}
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007279
John McCall60d7b3a2010-08-24 06:29:42 +00007280ExprResult Sema::RebuildExprInCurrentInstantiation(Expr *E) {
John McCallb3d87482010-08-24 05:47:05 +00007281 CurrentInstantiationRebuilder Rebuilder(*this, E->getExprLoc(),
7282 DeclarationName());
7283 return Rebuilder.TransformExpr(E);
7284}
7285
John McCall63b43852010-04-29 23:50:39 +00007286bool Sema::RebuildNestedNameSpecifierInCurrentInstantiation(CXXScopeSpec &SS) {
Douglas Gregor7e384942011-02-25 16:07:42 +00007287 if (SS.isInvalid())
7288 return true;
John McCall31f17ec2010-04-27 00:57:59 +00007289
Douglas Gregor7e384942011-02-25 16:07:42 +00007290 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
John McCall31f17ec2010-04-27 00:57:59 +00007291 CurrentInstantiationRebuilder Rebuilder(*this, SS.getRange().getBegin(),
7292 DeclarationName());
Douglas Gregor7e384942011-02-25 16:07:42 +00007293 NestedNameSpecifierLoc Rebuilt
7294 = Rebuilder.TransformNestedNameSpecifierLoc(QualifierLoc);
7295 if (!Rebuilt)
7296 return true;
John McCall63b43852010-04-29 23:50:39 +00007297
Douglas Gregor7e384942011-02-25 16:07:42 +00007298 SS.Adopt(Rebuilt);
John McCall63b43852010-04-29 23:50:39 +00007299 return false;
John McCall31f17ec2010-04-27 00:57:59 +00007300}
7301
Douglas Gregor20606502011-10-14 15:31:12 +00007302/// \brief Rebuild the template parameters now that we know we're in a current
7303/// instantiation.
7304bool Sema::RebuildTemplateParamsInCurrentInstantiation(
7305 TemplateParameterList *Params) {
7306 for (unsigned I = 0, N = Params->size(); I != N; ++I) {
7307 Decl *Param = Params->getParam(I);
7308
7309 // There is nothing to rebuild in a type parameter.
7310 if (isa<TemplateTypeParmDecl>(Param))
7311 continue;
7312
7313 // Rebuild the template parameter list of a template template parameter.
7314 if (TemplateTemplateParmDecl *TTP
7315 = dyn_cast<TemplateTemplateParmDecl>(Param)) {
7316 if (RebuildTemplateParamsInCurrentInstantiation(
7317 TTP->getTemplateParameters()))
7318 return true;
7319
7320 continue;
7321 }
7322
7323 // Rebuild the type of a non-type template parameter.
7324 NonTypeTemplateParmDecl *NTTP = cast<NonTypeTemplateParmDecl>(Param);
7325 TypeSourceInfo *NewTSI
7326 = RebuildTypeInCurrentInstantiation(NTTP->getTypeSourceInfo(),
7327 NTTP->getLocation(),
7328 NTTP->getDeclName());
7329 if (!NewTSI)
7330 return true;
7331
7332 if (NewTSI != NTTP->getTypeSourceInfo()) {
7333 NTTP->setTypeSourceInfo(NewTSI);
7334 NTTP->setType(NewTSI->getType());
7335 }
7336 }
7337
7338 return false;
7339}
7340
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007341/// \brief Produces a formatted string that describes the binding of
7342/// template parameters to template arguments.
7343std::string
7344Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params,
7345 const TemplateArgumentList &Args) {
Douglas Gregor910f8002010-11-07 23:05:16 +00007346 return getTemplateArgumentBindingsText(Params, Args.data(), Args.size());
Douglas Gregor9148c3f2009-11-11 19:13:48 +00007347}
7348
7349std::string
7350Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params,
7351 const TemplateArgument *Args,
7352 unsigned NumArgs) {
Dylan Noblesmithf7ccbad2012-02-05 02:13:05 +00007353 SmallString<128> Str;
Douglas Gregor87dd6972010-12-20 16:52:59 +00007354 llvm::raw_svector_ostream Out(Str);
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007355
Douglas Gregor9148c3f2009-11-11 19:13:48 +00007356 if (!Params || Params->size() == 0 || NumArgs == 0)
Douglas Gregor87dd6972010-12-20 16:52:59 +00007357 return std::string();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007358
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007359 for (unsigned I = 0, N = Params->size(); I != N; ++I) {
Douglas Gregor9148c3f2009-11-11 19:13:48 +00007360 if (I >= NumArgs)
7361 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007362
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007363 if (I == 0)
Douglas Gregor87dd6972010-12-20 16:52:59 +00007364 Out << "[with ";
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007365 else
Douglas Gregor87dd6972010-12-20 16:52:59 +00007366 Out << ", ";
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007367
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007368 if (const IdentifierInfo *Id = Params->getParam(I)->getIdentifier()) {
Douglas Gregor87dd6972010-12-20 16:52:59 +00007369 Out << Id->getName();
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007370 } else {
Douglas Gregor87dd6972010-12-20 16:52:59 +00007371 Out << '$' << I;
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007372 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007373
Douglas Gregor87dd6972010-12-20 16:52:59 +00007374 Out << " = ";
Douglas Gregor8987b232011-09-27 23:30:47 +00007375 Args[I].print(getPrintingPolicy(), Out);
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007376 }
Douglas Gregor87dd6972010-12-20 16:52:59 +00007377
7378 Out << ']';
7379 return Out.str();
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007380}
Francois Pichet8387e2a2011-04-22 22:18:13 +00007381
7382void Sema::MarkAsLateParsedTemplate(FunctionDecl *FD, bool Flag) {
7383 if (!FD)
7384 return;
7385 FD->setLateTemplateParsed(Flag);
7386}
7387
7388bool Sema::IsInsideALocalClassWithinATemplateFunction() {
7389 DeclContext *DC = CurContext;
7390
7391 while (DC) {
7392 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) {
7393 const FunctionDecl *FD = RD->isLocalClass();
7394 return (FD && FD->getTemplatedKind() != FunctionDecl::TK_NonTemplate);
7395 } else if (DC->isTranslationUnit() || DC->isNamespace())
7396 return false;
7397
7398 DC = DC->getParent();
7399 }
7400 return false;
7401}